PROJECTION DIRECTION CHANGE DEVICE
`
`AND IMAGE PROJECTION SYSTEM
`
`BACKGROUND
`
`1. Technical Field
`
`[0001]
`
`The present disclosure relates to a projection direction change
`
`device that changes the projection direction of an image projected from
`
`a projector.
`
`10
`
`2. Description of the Related Art
`
`[0002]
`
`A projection direction change device, also called a moving mirror,
`
`changes the projection direction of an image projected from a projector
`
`and allows the image to be projected in widespread directions.
`
`Ifa
`
`15
`
`projector is installed under some constraints or is heavy, it is effective
`
`to change the projection direction of an image using a projection
`
`direction change device.
`
`[0008]
`
`In patent literature (PTL) 1, a mirror is disposed between the lens
`
`20
`
`of the projection optical system of a projector and a screen, and the
`
`projection direction of the image is changed by the mirror to further
`
`correct the distortion of the image.
`
`[0004]
`
`PTL1
`
`is
`
`Japanese
`
`Patent Unexamined
`
`Publication No.
`
`25
`
`2002-262198.
`
`[0005]
`
`Attempting to project a projection image in widespread directions
`
`
`
`AND IMAGE PROJECTION SYSTEM
`
`BACKGROUND
`
`1. Technical Field
`
`[0001]
`
`The present disclosure relates to a projection direction change
`
`device that changes the projection direction of an image projected from
`
`a projector.
`
`10
`
`2. Description of the Related Art
`
`[0002]
`
`A projection direction change device, also called a moving mirror,
`
`changes the projection direction of an image projected from a projector
`
`and allows the image to be projected in widespread directions.
`
`Ifa
`
`15
`
`projector is installed under some constraints or is heavy, it is effective
`
`to change the projection direction of an image using a projection
`
`direction change device.
`
`[0008]
`
`In patent literature (PTL) 1, a mirror is disposed between the lens
`
`20
`
`of the projection optical system of a projector and a screen, and the
`
`projection direction of the image is changed by the mirror to further
`
`correct the distortion of the image.
`
`[0004]
`
`PTL1
`
`is
`
`Japanese
`
`Patent Unexamined
`
`Publication No.
`
`25
`
`2002-262198.
`
`[0005]
`
`Attempting to project a projection image in widespread directions
`
`
`
`by increasing the inclination angle of the mirror, however, requires a
`
`large mirror, which may undesirably be in contact with the projection
`
`lens unit of the projector.
`
`SUMMARY
`
`[0006]
`
`An object of the present disclosure is to provide a projection
`
`direction change device and an image projection system that largely
`
`change the range of projection directions with a limited increase of the
`
`10
`
`sizes of the device and the system.
`
`[0007]
`
`A projection direction change device of the present disclosure
`
`includes
`
`a mirror that reflects light emitted from a projection lens unit ofa
`
`15
`
`projector,
`
`a mirror support part that rotatably supports the mirror around a
`
`first axis and a second axis,
`
`a first drive part that rotary drives the mirror around the first axis,
`
`and
`
`20
`
`a second drive part that rotary drives the mirror around the second
`
`axis,
`
`where an intersecting point of the first and second axes is positioned
`
`closer to the projection lens unit than a geometric barycenter of the
`
`mirror is.
`
`25
`
`[0008]
`
`An image projection system of the present disclosure includes
`
`the above-described projection direction change device having a
`
`
`
`mirror controller that indicates a drive amount of the mirror to the
`
`first and second drive parts,
`
`the projector that projects an image,
`
`an image output device that outputs an image to the projector, and
`
`a controller that sends a command signal about the attitude of the
`
`mirror to the mirror controller and outputs an image output signal
`
`synchronized with the command signal to the image output device.
`
`[0009]
`
`A projection direction change device and an image projection
`
`10
`
`system largely change the range of projection directions while limiting
`
`an increase of the sizes of the device and system.
`
`BRIEF DESCRIPTION OF DRAWINGS
`
`[0010]
`
`15
`
`FIG. 1 is an outline sectional view of a projection direction change
`
`device as a comparative example.
`
`FIG. 2 is an outline sectional view of a projection direction change
`
`device of the present disclosure.
`
`FIG. 8 is a perspective view of a projection direction change device
`
`20
`
`according to the first exemplary embodiment of the present disclosure,
`
`viewed from the front.
`
`FIG. 4 is a front view of the projection direction change device,
`
`viewed from the front.
`
`FIG. 5 is a perspective view of the mirror unit, viewed from the
`
`25
`
`back.
`
`FIG. 6 is a perspective view of the mirror frame, viewed from the
`
`back.
`
`
`
`FIG. 7 is a back view of the projection direction change device,
`
`viewed from the back.
`
`FIG. 8 is a block diagram illustrating the configuration of an
`
`image projection system.
`
`FIG. 9 is a block diagram illustrating the configuration of an
`
`image
`
`projection
`
`system according
`
`to
`
`the
`
`second
`
`exemplary
`
`embodiment of the present disclosure.
`
`FIG. 10 is a block diagram illustrating the configuration of an
`
`image projection system according to the third exemplary embodiment
`
`10
`
`of the present disclosure.
`
`FIG.
`
`11 is a perspective view of a projection direction change
`
`device of modified example 1 of the present disclosure.
`
`FIG. 12 is a perspective view of a projection direction change
`
`device of modified example 2 of the present disclosure.
`
`15
`
`FIG.
`
`138
`
`is a perspective view of a projection direction change
`
`device of modified example 3 of the present disclosure.
`
`DETAILED DESCRIPTION
`
`[0011]
`
`20
`
`Hereinafter, a detailed description is made of some embodiments
`
`with reference to the related drawings as appropriate. However, a
`
`detailed description more than necessary may be omitted, such as a
`
`description of a well-known item and a duplicate description for a
`
`substantially identical
`
`component,
`
`to
`
`avoid
`
`an unnecessarily
`
`25
`
`redundant description and to allow those skilled in the art to easily
`
`understand the following description.
`
`Note
`
`that
`
`the
`
`accompanying drawings
`
`and the
`
`following
`
`
`
`description are provided for those skilled in the art to well understand
`
`the disclosure, and it
`
`is not
`
`intended that
`
`the drawings and the
`
`description limit the subjects described in the claims.
`
`[0012]
`
`A rough description is made of the difference between projection
`
`direction change device 201 as a comparative example and projection
`
`direction change device 1 of the present disclosure in reference to FIGs.
`
`1 and 2.
`
`FIG.
`
`1
`
`is an outline sectional view of projection direction
`
`change device 201 as a comparative example.
`
`FIG. 2 is an outline
`
`10
`
`sectional view of projection direction change device 1 of the present
`
`disclosure.
`
`[0013]
`
`As shown in FIG.
`
`1, mirror 203 as a comparative example is
`
`capable of pan rotation with the Y-axis direction being rotation axis Ry
`
`15
`
`(the first axis) and tilt rotation with the X-axis direction being rotation
`
`axis Rx (the second axis). Mirror 203 is supported so that geometric
`
`barycenter Pgl of mirror 208 (uniform in weight across the mirror
`
`surface)
`
`is positioned equal
`
`to intersecting point Prl of the two
`
`rotation axes of pan rotation and tilt rotation of mirror 208.
`
`20
`
`[0014]
`
`Distance L1 from the end of mirror 203 opposite to projection lens
`
`unit 205 to intersecting point Prl of the two rotation axes is roughly
`
`the same as distance L2 from intersecting point Prl to the end of
`
`mirror 208 closer to projection lens unit 205.
`
`In this case, projection
`
`25
`
`lens unit 205 must be spaced from intersecting point Prl of the two
`
`rotation axes to the degree that
`
`the end of mirror 208 closer to
`
`projection lens unit 205 does not interfere with projection lens unit 205
`
`
`
`while tilt rotation around rotation axis Rx is driven.
`
`Intersecting
`
`point Pr1 of the two rotation axes is disposed on optical axis La of light
`
`emitted from projection lens unit 205. This prolongs the distance
`
`from the region of mirror 208 opposite to projection lens unit 205 to
`
`projection lens unit 205, and an image projected from projection lens
`
`unit 205 is magnified and is projected into the region of mirror 2038
`
`opposite to projection lens unit 205. Accordingly, the size of mirror
`
`203 needs to be increased in order that the whole light projected from
`
`projection lens unit 205 is projected onto mirror 2038.
`
`10
`
`[0015]
`
`In projection direction change device 1 of the present disclosure,
`
`on the other hand, intersecting point Pr2 of the two rotation axes is
`
`positioned closer to projection lens unit 113 than geometric barycenter
`
`Pg2 of mirror 26 is. Distance L4 from intersecting point Pr2 to the
`
`15
`
`end of mirror 26 closer to projection lens unit 113 is shorter than
`
`distance L8 from the end of mirror 26 opposite to projection lens unit
`
`118 to intersecting point Pr2 of the two rotation axes. This shortens
`
`the distance from the region of mirror 26 opposite to projection lens
`
`unit 118 to projection lens unit 113 even if projection lens unit 118 is
`
`20
`
`spaced from intersecting point Pr2 of the two rotation axes to the
`
`degree that the end of mirror 26 closer to projection lens unit 1138 does
`
`not
`
`interfere with projection lens unit 118.
`
`This suppresses an
`
`increase of the size of an image projected into the region of mirror 26
`
`opposite to projection lens unit 118. Accordingly, mirror 26 can be
`
`25
`
`downsized, and so can projection direction change device 1 and image
`
`projection system 100 (refer to FIG. 8). Note that rotation axis Ry can
`
`be parallel-translated in direction Z, where the intersecting point of a
`
`
`
`straight line vertically projected onto the surface of mirror 26 standing
`
`up from rotation axis Ry and rotation axis Rx is to be intersecting point
`
`Pr2.
`
`[0016]
`
`FIRST EXEMPLARY EMBODIMENT
`
`Hereinafter,
`
`a description is made of
`
`the first exemplary
`
`embodiment as an example of above-described projection direction
`
`change device 1 in reference to FIGs 3 through 7.
`
`[0017]
`
`10
`
`1-1. Configuration
`
`FIG. 3 is a perspective view of projection direction change device 1
`
`according to the first exemplary embodiment of the present disclosure,
`
`viewed from the front.
`
`FIG. 4 is a front view of projection direction
`
`change device 1, viewed from the front.
`
`FIG. 5 isa perspective view of
`
`15
`
`mirror unit 3, viewed from the back.
`
`For convenience of the following
`
`description, each figure is assumed to be based on the XYZ rectangular
`
`coordinate system shown in the figure. Note that
`
`the reflection
`
`direction of mirror 26 is front
`
`in a state where mirror 26 is not
`
`rotating.
`
`20
`
`[0018]
`
`Projection direction change device
`
`1 changes
`
`the projection
`
`direction of light projected from projection lens unit 118 of projector
`
`111. Projection direction change device 1 includes mirror unit 8, head
`
`case part 5 composed of first case 5a and second case 5b, mirror
`
`25
`
`controller 7, support 9, attaching part 11, and connector 138.
`
`[0019]
`
`Mirror unit 3 includes mirror part 21 that reflects light projected
`
`
`
`from projection lens unit 118, mirror support part 23 that rotatably
`
`supports mirror part 21, and mirror driver 25 that rotary drives mirror
`
`part 21. Note that,
`
`in projector 111, projection lens unit 1138 that
`
`projects an image displayed by image display device 115 (refer to FIG.
`
`9) is composed of multiple lens groups.
`
`[0020]
`
`Mirror part 21 includes mirror 26 that reflects light projected from
`
`projection lens unit 113 and mirror frame 27 fitted onto the outer edge
`
`of mirror 26. Mirror 26 has a hexagonal shape for example, where it
`
`10
`
`may have a polygonal shape (at least a triangular shape) and its outer
`
`edge may be curved. Mirror 26 has a wider
`
`region opposite to
`
`projection lens unit 113 than the region closer to projection lens unit
`
`118. For example, mirror 26 has a shape formed by two trapezoids
`
`combined to each other with one side common, where the side closer to
`
`15
`
`projection lens unit 113 of mirror 26 is shorter than the side opposite to
`
`projection lens unit 118. Mirror 26, for example, has a shape in which
`
`the region expands outward from the side closer to projection lens unit
`
`118 and then the region contracts inward. Mirror 26 may have any
`
`one of the shapes: planar, concave, and convex.
`
`20
`
`[0021]
`
`Mirror frame 27 is rotatably supported by mirror supporting part
`
`23 around the X and Y axes. Mirror frame 27 has rib 27a and multiple
`
`through holes 27b formed so that the barycenter of mirror part 21
`
`(formed by unifying mirror 26 and mirror frame 27) is positioned on
`
`25
`
`intersecting point Pr2 of the two axes: the support shaft (coincident
`
`with rotation axis Rx) of mirror frame 27 at mirror support part 23 and
`
`rotation axis Ry of mirror support part 28. Also, mirror frame 27 has
`
`
`
`first gear 27c (like a semicircular plate) formed on the back surface.
`
`The weight of mirror part 21 is adjusted by rib 27a, through holes 27b,
`
`and first gear 27c. Through hole 27b of a larger region is formed
`
`opposite to projection lens unit 113 than closer to projection lens unit
`
`118 of mirror frame 27, and thus the barycenter of mirror frame 27 is
`
`positioned closer to projection lens unit 1138 than geometric barycenter
`
`Pg2 of mirror 26 is.
`
`[0022]
`
`Mirror frame 27 has two pins 27d extending outward from the
`
`10
`
`outer edge. Each of two pins 27d is rotatably inserted into hole 23a
`
`provided at the tip of mirror support part 23. The two pins function as
`
`rotation axis Rx of tilt rotation.
`
`[0023]
`
`Mirror driver 25 includes first drive part 81 that rotary drives
`
`15
`
`mirror part 21 around the Y axis and second drive part 41 that rotary
`
`drives mirror part 21 around the X axis.
`
`[0024]
`
`First drive part 31 changes the inclination angle of mirror part 21
`
`around the Y axis. First drive part 31 includes first motor 38, driven
`
`20
`
`pulley 35 that is driven by the rotation of first motor 38, and belt 37
`
`that transmits the rotation output of first motor 38 to driven pulley 35.
`
`Rotation axis 39 of driven pulley 35, connected with mirror support
`
`part 23, pan-rotates mirror support part 23 in response to the rotation
`
`amount of first motor 88. Rotation axis 39 of driven pulley 35 is
`
`25
`
`rotation axis Ry (the first axis). First motor 38, driven pulley 35, and
`
`belt 37 are accommodated in head case part 5. Mirror 26 supported by
`
`mirror support part 28 is rotatable (e.g., 260°) around rotation axis Ry
`
`
`
`by first motor 38. First motor 33 is electrically connected with mirror
`
`controller 7, which controls the rotation amount of first motor 83.
`
`[0025]
`
`Second drive part 41 changes the inclination angle of mirror part
`
`21 around the X axis. Second drive part 41 includes second motor 43.
`
`Second motor 43 has output gear 43a, which engages with first gear 27c.
`
`Second motor 48 is supported by mirror support part 23. Rotation of
`
`output gear 48a of second motor 48 rotates first gear 27c together with
`
`mirror frame 27, and mirror part 21 tilt-rotates. Mirror 26 supported
`
`10
`
`by mirror support part 28 is rotatable (e.g., 0° to 90°) around rotation
`
`axis Rx (the second axis) by second motor 48. Mirror 26,
`
`thus
`
`rotatable from a state orthogonal to optical axis La to a state parallel
`
`with optical axis La, reflects projection light in a range between 0° and
`
`90°.
`
`Note
`
`that
`
`rotation axis Ry and rotation axis Rx
`
`are
`
`15
`
`orthogonalized to each other
`
`for example.
`
`Second motor
`
`438
`
`is
`
`electrically connected with mirror controller
`
`7, and the rotation
`
`amount of the motor is controlled by mirror controller 7.
`
`[0026]
`
`Mirror controller 7, connected with connector 138,
`
`is capable of
`
`20
`
`receiving a command signal from the outside through connector 18.
`
`Mirror controller 7 sends a drive signal to first motor 38 and second
`
`motor 43.
`
`[0027]
`
`Support 9 connects head case part 5 in which mirror controller 7 is
`
`25
`
`accommodated with attaching part 11. The position of direction Y of
`
`support 9 is adjustable by means of adjustment mechanism 10, and
`
`thus the distance between projection lens unit 118 and mirror part 21
`
`10
`
`
`
`can be adjusted in response to the length of projection lens unit 113.
`
`This allows the length of support 9 to be adjusted in response to the
`
`length of projection lens unit 113 so that
`
`the distance between
`
`projection lens unit 118 and mirror 26 is minimized to the degree that
`
`mirror 26 in a movable state does not interfere with projection lens
`
`unit 118. This allows mirror part 21 to be disposed at a position
`
`where the spread of projection light from projection lens unit 113 is
`
`suppressed, which suppresses upsizing of mirror part 21.
`
`[0028]
`
`10
`
`Support
`
`9 and attaching part
`
`11 are provided with length
`
`adjustment mechanism 10 that adjusts the connection position.
`
`Support 9 has multiple through holes 9a vertically formed in the
`
`bottom of support 9. Attaching part 11 has multiple bolt holes lla
`
`vertically formed in the surface in contact with support 9. The bottom
`
`15
`
`of support 9 is slidably connected to attaching part 11.
`
`Length
`
`adjustment mechanism 10 is composed of through holes 9a, bolt holes
`
`lla, and bolts 12. Support 9 is slided so that support 9 is at a desired
`
`height, bolts 12 are inserted in a state where through holes 9a of
`
`support 9 are aligned with bolt holes 11a of attaching part 11, and they
`
`20
`
`are fastened. Note that length adjustment mechanism 10 may be of
`
`another configuration, such as a motor and a rack pinion set.
`
`[0029]
`
`Attaching part
`
`11
`
`is an attachment
`
`for
`
`fastening projection
`
`direction change device 1
`
`to projector 111. Attaching part 11 is
`
`25
`
`U-shaped for example. The bottom surface of attaching part 11 is
`
`attached on the plane where projection lens unit 113 of projector 111 is
`
`disposed so that attaching part
`
`11 encloses lens barrel
`
`1138a of
`
`11
`
`
`
`projection lens unit 118. Note that attaching part 11 may be attached
`
`to lens barrel 118a of projection lens unit 113.
`
`[00380]
`
`Connector 138, disposed on support 9,
`
`is connected with mirror
`
`controller 7. The socket of a communication cable connected with an
`
`outside control device is disposed so that the cable can be inserted into
`
`connector 13 in whatever attitude projector 111 is placed. Connector
`
`13 is provided opposite to mirror 26 of support 9 for example.
`
`Connector 13 may be disposed on head case part 5.
`
`10
`
`[0081]
`
`Next, a description is made of the configuration of image projection
`
`system 100 including projection direction change device 1 in reference
`
`to FIG. 8.
`
`FIG. 8 is a block diagram illustrating the configuration of
`
`image projection system 100.
`
`15
`
`[0032]
`
`Image projection system 100 includes projector system 110,
`
`controller 101, and image output device 108, for example.
`
`[0033]
`
`Controller 101 controls the image output to projector 111. Also,
`
`20
`
`controller
`
`101 generates
`
`a
`
`control
`
`command containing drive
`
`information, such as a target angle (pan and tilt angles) of the rotation
`
`of mirror part 21 corresponding to an image to be output, rotary drive
`
`speed, and drive acceleration, and then sends the control command to
`
`mirror controller 7 through connector 138 of projection direction change
`
`25
`
`device 1.
`
`[0034]
`
`Controller 101 can be implemented from semiconductor devices for
`
`12
`
`
`
`example. Controller 101 can be composed of a microprocessor, CPU,
`
`MPU, GPU, DSP, FPGA, and ASIC,
`
`for example. The functions of
`
`controller 101 may be performed by hardware devices only, or a
`
`combination of hardware devices and software programs. Controller
`
`101 has a storage part such as a hard disk drive (HDD), SSD, and
`
`memory. Controller 101 reads data and programs stored in the
`
`storage part and performs various types of operations to implement
`
`given functions.
`
`[0035]
`
`10
`
`Communications from controller 101 to mirror controller 7 may be
`
`serial communications (e.g., RS232C) or IP communications through a
`
`LAN.
`
`In synchronization with transmission timing of a control
`
`command from controller 101 to mirror controller 7, a control command
`
`containing drive information of mirror part 21 is output from controller
`
`15
`
`101 also to image output device 108.
`
`In synchronization with this
`
`control command, a projection image is output from image output
`
`device 108 to projector 111. Note that controller 101 and image output
`
`device 108 may be an identical device composed of one personal
`
`computer (PC) or an edge terminal, for example.
`
`20
`
`[0036]
`
`Mirror controller 7 includes motor controller 51, memory 58, first
`
`motor driver 55, and second motor driver 57. Mirror controller 7 can
`
`be implemented from semiconductor devices for example. Mirror
`
`controller 7 can be composed of a microprocessor, CPU, MPU, GPU,
`
`25
`
`DSP, FPGA,
`
`and ASIC,
`
`for example.
`
`The functions of mirror
`
`controller
`
`7 may be performed by hardware devices only, or a
`
`combination of hardware devices and software programs. Mirror
`
`13
`
`
`
`controller
`
`7
`
`reads data and programs stored in memory 58 and
`
`performs various types of operations to implement given functions.
`
`[0037]
`
`Motor controller 51 of mirror controller 7 transforms a control
`
`command received from controller 101 to a motor driver control signal,
`
`and sends a corresponding motor driver control signal to first motor
`
`driver 55 and second motor driver 57. Mirror controller 7 enters the
`
`initial examination mode in which the states of first motor 33, second
`
`motor 48, and the gear are monitored when projection direction change
`
`10
`
`device 1
`
`is started up (e.g., power up). Motor controller 51 sends
`
`multiple patterns of test signals to first motor driver 55 and second
`
`motor driver 57, and refers to the test results when transforming a
`
`control command to a motor driver control signal.
`
`[0038]
`
`15
`
`Note that instead of sending a control command as a command
`
`signal from controller 101 to motor controller 51,
`
`the following way
`
`may be used. That is, a mirror operation sequence composed of a
`
`sequence of a pan angle and tilt angle is stored in memory 58 of mirror
`
`controller 7 in advance, and a timing signal received from controller
`
`20
`
`101 triggers motor controller 51 to read the mirror operation sequence.
`
`[0039]
`
`Image output device 103 outputs an image to projector 111
`
`according to drive information from controller 101 and an image output
`
`signal specifying the type of an image to be displayed.
`
`Image output
`
`25
`
`device 103 includes image processor 108a and memory 108b. Memory
`
`108b stores multiple types of image data as a base to be output to
`
`projector 111.
`
`Image processor 108a predicts the distortion of an
`
`14
`
`
`
`image at mirror part 21 referring to distortion information of a
`
`projection image and performs image correction about the direction
`
`and amountof distortion in image data as a base specified by an image
`
`output signal. Distortion information contains a control command
`
`sent from controller 101 to mirror controller 7 and information about a
`
`projection surface.
`
`[0040]
`
`1-2. Advantages
`
`As described above, projection direction change device 1 according
`
`10
`
`to the first exemplary embodiment includes mirror 26 that reflects
`
`light emitted from projection lens unit 1138 of projector 111, mirror
`
`support part 23 that rotatably supports mirror 26 around the two axes
`
`of tilt rotation and pan rotation, first drive part 31 that rotary drives
`
`mirror 26 around the rotation axis of tilt rotation, and second drive
`
`15
`
`part 41 that rotary drives mirror 26 around the rotation axis of pan
`
`rotation.
`
`Intersecting point Pr2 of rotation axis Rx of pan rotation
`
`and rotation axis Ry of tilt rotation is positioned closer to projection
`
`lens unit 1138 than geometric barycenter Pg2 of mirror 26 is. With this
`
`simple configuration, intersecting point Pr2 of the two rotation axes is
`
`20
`
`positioned closer to projection lens unit 1138 than geometric barycenter
`
`Pg2 of mirror 26 is. The distance from intersecting point Pr2 to the
`
`end of mirror 26 closer to projection lens unit 113 is shorter than the
`
`distance from the end of mirror 26 opposite to projection lens unit 1138
`
`to intersecting point Pr2 of the two rotation axes. This shortens than
`
`25
`
`ever the distance from the region of mirror 26 opposite to projection
`
`lens unit 113 to projection lens unit 118 even if projection lens unit 1138
`
`is spaced from intersecting point Pr2 of the two rotation axes to the
`
`15
`
`
`
`degree that the end of mirror 26 closer to projection lens unit 113 does
`
`not
`
`interfere with projection lens unit 118.
`
`This suppresses an
`
`increase of the size of an image projected into the region of mirror 26
`
`opposite to projection lens unit 113 of mirror 26. This increases the
`
`rotation angle of mirror 26 to increase the range of changing projection
`
`directions of light from projection lens unit 118, and mirror 26 can be
`
`downsized, as well as projection direction change device 1 and image
`
`projection system 100.
`
`[0041]
`
`10
`
`Also, the weight balance of mirror frame 27 has been adjusted so
`
`that the barycenter of mirror part 21 (refer to FIG. 3) composed of
`
`mirror 26 and mirror frame 27 is positioned closer to intersecting point
`
`Pr2 of two rotation axes than geometric barycenter Pg2 of mirror 26 is.
`
`This reduces the drive load while mirror part 21 is rotary driven.
`
`15
`
`Whenintersecting point Pr2 of the barycenter of mirror part 21 is
`
`positioned at intersecting point Pr2 of two rotation axes, the drive load
`
`can be minimized while mirror part 21 is rotary driven.
`
`[0042]
`
`SECOND EXEMPLARY EMBODIMENT
`
`20
`
`Hereinafter,
`
`a description is made of
`
`the second exemplary
`
`embodiment in reference to FIG. 9.
`
`[0043]
`
`2-1. Configuration
`
`FIG. 9 is a block diagramillustrating the configuration of image
`
`25
`
`projection system 100A according to the second exemplary embodiment
`
`of the present disclosure.
`
`[0044]
`
`16
`
`
`
`In image projection system 100A of the second embodiment, a
`
`makeup in which projection lens unit 1138 of projector 111 is driven in
`
`conjunction with the action of an image has been added to image
`
`projection system 100 of the first embodiment. The makeups other
`
`than that described above and those described hereinafter are common
`
`between image projection system 100A of the second embodiment and
`
`image projection system 100 of the first embodiment.
`
`[0045]
`
`Image projection system 100A includes projector system 110A,
`
`10
`
`controller 101, and image output device 103. Projector system 110A
`
`includes projector 111A and projection direction change device 1.
`
`[0046]
`
`Projector 111A includes image display device 115 and lens driver
`
`117.
`
`Image display device 115 displays an image sent from image
`
`15
`
`processor 108a. Lens driver 117 moves some or all of the lenses in
`
`projection lens unit 113 that projects an image displayed by image
`
`display device 115 along the optical axis. Lens driver 117 also shifts
`
`the optical axis. Lens driver 117 is a mechanism for zoom adjustment,
`
`focus adjustment, and shift adjustment of projection lens unit 1138 for
`
`20
`
`example.
`
`In the second embodiment,
`
`lens driver 117 adjusts the
`
`projection functions of the projector, including at least one of the zoom
`
`function, focus function, and shift function of projection lens unit 118,
`
`in conjunction with the rotation of mirror part 21.
`
`[0047]
`
`25
`
`Controller 101 sends a control signal for lens drive to lens driver
`
`117 of projector 111A in synchronization with a control command to be
`
`sent to projection direction change device 1. A control signal for lens
`
`17
`
`
`
`drive contains information about a zoom amount, a focus position, and
`
`a shift position of projection lens unit 118, for example. A control
`
`signal for lens drive is calculated by controller 101 according to drive
`
`information about rotary driving of mirror part 21 contained in a
`
`control command. Lens driver 117 drives some or all of the lenses in
`
`projection lens unit 113 based on a control signal for lens drive.
`
`[0048]
`
`Controller 101 generates a control signal for lens drive with the
`
`focus position changed so that an imageto be projected is in focus in a
`
`10
`
`case where the projection distance changes,
`
`for example, when the
`
`projection surface (e.g., a wall) moves to another surface due to
`
`rotation of mirror part 21. Using this signal, lens driver 117 adjusts
`
`the focus amount of projection lens unit 118, which prevents an image
`
`to be projected from being out of focus even if the projection surface has
`
`15
`
`changed.
`
`[0049]
`
`Controller 101 generates a control signal for lens drive with the
`
`zoom amount adjusted in conjunction with mirror drive so that the size
`
`of a projection image does not change while mirror part 21 is rotating.
`
`20
`
`Using this signal,
`
`lens driver 117 adjusts the zoom amount of
`
`projection lens unit 1138, which prevents the size of a projection image
`
`from changing even when the projection distance has changed.
`
`[0050]
`
`Controller 101 generates a control signal for lens drive for shifting
`
`25
`
`the optical axis of projection lens unit 113 (multiple lenses included) so
`
`that image vignetting is minimized within the rotation range of mirror
`
`part 21 if the range is known in advance, or so that the loss of
`
`18
`
`
`
`resolution due to image correction 1s minimized. With this signal,
`
`lens driver 117 shifts the optical axis of projection lens unit 1138, which
`
`suppresses an increase of image vignetting.
`
`[0051]
`
`Lens driver 117 thus moves the optical axes of some or all of the
`
`lenses in projection lens unit 113 along or parallel with the projection
`
`direction in synchronization with a control command sent
`
`from
`
`controller 101 to mirror controller 7 for drive-controlling mirror 26,
`
`based on a control signal for lens drive that is a command signal from
`
`10
`
`controller 101.
`
`In other words, lens driver 117 adjusts the projection
`
`function of projector 111A in collaboration with drive-control of mirror
`
`26 of projection direction change device 1 based on a command signal
`
`from controller 101. This adjustment prevents the deterioration of an
`
`image projected onto a projection surface due to a change of the
`
`15
`
`projection direction by mirror 26.
`
`[0052]
`
`THIRD EXEMPLARY EMBODIMENT
`
`Hereinafter,
`
`a description is made of
`
`the third exemplary
`
`embodiment in reference to FIG. 10.
`
`20
`
`[0058]
`
`3-1. Configuration
`
`FIG. 10 is a schematic diagram illustrating the configuration of
`
`image projection system 100B according to the third embodimentof the
`
`present disclosure.
`
`25
`
`[0054]
`
`In image projection system 100B of the third embodiment, attitude
`
`sensor 59 that detects a state of the attitude of mirror part 21 has been
`
`19
`
`
`
`added to projection direction change device 1 of image projection
`
`system 100 of the first embodiment. The makeups other than that
`
`described above and those described hereinafter are common between
`
`image projection system 100B of the third embodiment and image
`
`projection system 100 of the first embodiment.
`
`[0055]
`
`Attitude sensor 59, attached to projection direction change device
`
`1B, measures the attitude angle of mirror 26. Attitude sensor 59 isa
`
`motion sensor such as a gyro sensor. Measurement of a state of the
`
`10
`
`attitude of mirror 26 by attitude sensor 59 is performed when
`
`projection direction change device 1B is started up, always, or on a
`
`user's command.
`
`[0056]
`
`Attitude data, detected by attitude sensor 59, representing a state
`
`15
`
`of the attitude of mirror part 21 is converted to a reference position at
`
`that time and a step amountof drive (e.g., pan rotation, tilt rotation)
`
`by motor controller 51, and the resulting data is used as correction
`
`data for a motor driver control signal created based on a control
`
`command. This data further increases the rotation accuracy of mirror
`
`20
`
`26,
`
`[0057]
`
`OTHER EXEMPLARY EMBODIMENTS
`
`Hereinbefore,
`
`the description is made of the embodiments for
`
`exemplification of the technologies in the disclosure. However, these
`
`25
`
`technologies are not
`
`limited to the embodiments, but are also
`
`applicable to embodiments that have undergone change, substitution,
`
`addition, and/or omission.
`
`20
`
`
`
`[0058]
`
`In the above-described embodiment, attaching part 11 of projection
`
`direction change device 1
`
`is attached to the surface of projector 111
`
`from which lens barrel 118a of projection lens unit 118 protrudes, but
`
`the disclosure is not limited to this embodiment. For projector 111
`
`vertically placed,
`
`like projector system 110A shown in modified
`
`example 1 of FIG. 11, arm 11b connected with attaching part 11 may be
`
`attached to side surface 11lla of projector 111,
`
`in addition to the
`
`makeup in which attaching part 11 is attached to one surface of
`
`10
`
`projector 111 from which lens barrel 118a protrudes. Arm 11b may be
`
`attached directly to the side surface of the main body of projector 111,
`
`or to frame 111b that supports the main body of projector 111, as shown
`
`in FIG. 11.
`
`In this way, in addition to one surface of the main body of
`
`projector 111, projection direction change device 1 attached to another
`
`15
`
`surface of the main body of projector 111 or to the main body allows
`
`projection direction change device 1 to be supported by at least two
`
`surfaces of the main body of projector 111. Accordingly, projection
`
`direction change device 1 can be placed more stably. Besides, arm 11b
`
`attached to a frame supporting the main bodyof projector 111, instead
`
`20
`
`of another surface of the main body of projector 111, provides the
`
`similar advantage.
`
`[0059]
`
`Depending on the attitude of projector 111, projection direction
`
`change device 1 may be unstable when it is simply attached to lens
`
`25
`
`barrel 113a by gravity.
`
`In this case, a support mechanism may be
`
`provided that holds or supports projection direction change device 1 of
`
`a surface of frame 111b or the main body of projector 111 vertical to the
`
`21
`
`
`
`gravitational direction.
`
`For ceiling-hung projector 111 horizontally
`
`placed, like projector system 110B shown in modified example 2 of FIG.
`
`12 for
Accessing this document will incur an additional charge of $.
After purchase, you can access this document again without charge.
Accept $ Charge
Still Working On It
This document is taking longer than usual to download. This can happen if we need to contact the court directly to obtain the document and their servers are running slowly.
Give it another minute or two to complete, and then try the refresh button.
A few More Minutes ... Still Working
It can take up to 5 minutes for us to download a document if the court servers are running slowly.
Thank you for your continued patience.
This document could not be displayed.
We could not find this document within its docket. Please go back to the docket page and check the link. If that does not work, go back to the docket and refresh it to pull the newest information.
Your account does not support viewing this document.
You need a Paid Account to view this document. Click here to change your account type.
Your account does not support viewing this document.
Set your membership
status to view this document.
With a Docket Alarm membership, you'll
get a whole lot more, including:
- Up-to-date information for this case.
- Email alerts whenever there is an update.
- Full text search for other cases.
- Get email alerts whenever a new case matches your search.
One Moment Please
The filing “” is large (MB) and is being downloaded.
Please refresh this page in a few minutes to see if the filing has been downloaded. The filing will also be emailed to you when the download completes.
Your document is on its way!
If you do not receive the document in five minutes, contact support at support@docketalarm.com.
Sealed Document
We are unable to display this document, it may be under a court ordered seal.
If you have proper credentials to access the file, you may proceed directly to the court's system using your government issued username and password.
Access Government Site
