* NOTICE*
`
`JPO and INPIT are not responsible for any damages caused by the use of this transiatian.
`
`4. This document has been translated by computer. So the translation may not reflect the original precisely.
`
`2. ***" shows a word which cannot be teansisted.
`
`3. in the drawings, any wards are not translated.
`
`Publication Number
`
`JP20111507604
`
`Bibliography
`(19) [Publication country] JP
`
`(2) [Kind of official gazette] A
`(11) [Publication number] 2077150760
`{43} [Date of publication of application] 201 10804
`
`($4) [Title of the invention] PROJECTOR SYSTEM
`(51) [international Patent Classification]
`
`GO3B
`
`24/00
`
`(2006.01)
`
`GO3B
`
`21/28
`
`(2006.07)
`
`5/74
`
`(2006.04)
`
`HOON
`[Fi
`
`G03B 21/00
`
`GO3R 21/28
`
`HOAN
`
`5/74
`
`D
`
`z
`
`(21) [Application number] 2010071789
`
`(22) [Filing date] 20700122
`
`(71) [Apaicand
`
`fName] SEIKO EPSON CORP
`
`(72) {inventor
`[Full name] KOMENO KUNIO
`
`Theme code (reference)]
`2k103
`
`5CO58
`
`{F-terns (reference) ]
`Z2KTO3AA01
`
`ZK TO3AAS
`
`2K1O3AB07
`
`

`

`Z2K103AB08
`
`2K103BB807
`
`2K1038CO3
`
`2k103BC47
`
`aki0IacAat2
`
`2K 103CA34
`
`SCOSSBAZS
`
`SCOSBEADZ
`
`SCOSSEAT2
`
`SCOSBEAIS
`
`Abstract
`
`(57) [Overview]
`
`PROBLEM TO BE SOLVED: Te provide a projector system which moves a projection
`image while suppressing reduction in resolution withoul moving a projectar.
`
`SOLUTION: The projector system 10 includes: the projector 4 that modulates lurninous
`flux emitted from a light source in accordance with image information to form imagelight,
`
`and projects the image light and a reflection device 2 that reflects the image light. The
`reflection device 2 inchides: a first reflection mirror 21 and a second reflection mirror 22
`
`that are arranged fo be opposed to each ofher and successively reflect the image light
`
`emitted from the projector 1; a first driving part 24 which integrally rotates the first
`
`reflection mirror 27 and the second reflection mirror 22 centering a first axis of rotation
`
`J? formed on a virtual plane crossing a plane along the reflection surface of each of the
`
`first reflection mirror 27 and the second reflection mirror 22, and including the normals of
`
`the reflection surfaces; and a second driving part 26 which rotates the second reflection
`mirror 22 centering a second axis of rotation J2 orthogonalto thefirst axis of rotation J4.
`
`> laim
`
`[Patent Claims]
`
`fClain 1]
`
`A projector which modulates the light flux amitted from the fight source according to
`
`image information to form image light and projects the image light;
`
`A reflection device for reflecting the image light;
`
`Preparation,
`
`The aforementionad reflectar,
`
`A 7 reflection mirror and a 2 reflection mirror which are arranged opposite each other
`
`

`

`and sequentially reflect the image light emitted from the prajector -
`
`A 7f driving part which rotates integrally with the 2 reflecting mirror and the 1 reflecting
`
`mirror around a 1 rotating shaft which crosses a surface along the reflecting surface of
`
`each of the 1 reflecting mirrar arnt the 2 refiecting mirror and is farmed on a virtual plane
`
`including a-normal line-of the respective reflecting surfaces;
`
`A 4 driving part for rotating at least one of the 2 reflecting mirror and the 1 reflecting
`
`mirror about a 2 rotating shaft orthogonal to the 2 rotating shaft ;
`
`The projector system characterized by preparation **”.
`
`[Claim 2]
`
`The projector system of claim 1.
`
`The projector system according to claim 7, wherein the projector and the refiection device
`are arranged such that an optical axis of the image light emitted fram the projector is
`
`located on the virtual plane.
`
`fClain 3]
`A projector systemaccording to claim 7 or 2.
`
`The projector system according to claim 1, further cornprising a 3 reflection mirror that
`reflects the image light on a side of the first reflection mirrorin front of the optical path.
`
`iClaim 4]
`
`A projector systemaccording to any one ofclaims 7 to 3.
`
`The projector system according to claim 4, further comprising an image correction unit
`
`that corrects an image corresponding to positions of the first reflecting mirror and the 2
`
`reflecting mirror.
`
`Description
`
`[Detailed description of the invention}
`iFechnical field]
`
`{0004}
`The present invention relates to a projector system which includes a projector for
`
`projecting image light and a device for reflecting image light emitted from the projector.
`
`fBackground of the Invention]
`
`{0002}
`
`Conventionally, a projector has been known in which a ight beam emitted from a light
`
`source is modulated according to image information to form image light, and the mage
`
`light is projected by a projection fens. In addition to this projector, a projector system has
`
`been proposed which includes a reflection device that reflects a fight flux and is
`
`configured so as fo be capable of changing the direction of image light (hereinafter
`
`

`

`referred to as “projection light") projected from the projector (see, for example, Patent
`
`Document 1).
`
`{0003}
`
`A projector system (moving projector system} described in Patent Document 7 includes
`
`a projector and a movable reflecting mirror (reflecting mirror}, and is. configured 80.as to
`
`move @ prolection image projected onto a screen or the like by the reflecting mirror
`
`rotating image light emitted from the projector.
`
`{O004]
`in one embodiment, a projector system is disclosed that includes a drive for rotating a
`
`reflective mivror and a control device having an image rotation circuit. The projector
`
`systemis configured such that the projection image moves.as the reflection mirror is
`
`rotated in the pan direction and the Hit direction. And when a reflection mirror rotates to
`
`a panning direction,
`
`Since the projection image rotates, it is corrected by the image rotation circuit.
`
`{0005}
`As another example, a projector system is disclosed that includes a drive for rotating a
`
`reflective mirror in a direction of tl and a turntable far rotating the projectar. The projector
`
`system is configured to move a projection image in a fit direction by rotating a reflection
`
`mirror, and to move a projection image in a pan direction by rotating a turntable.
`
`[Prior artreference]
`
`[Patent document]
`
`{0008}
`
`[Patent document 1]JP H 9-149296A4
`
`{Summary of the invention]
`iProblem to be salved by the invention]
`
`{0007}
`However,
`
`the projector system described in Patent Document 1 hae the following
`
`probienis. That is, in order for the image rotary circuit lo have corrected since a projection
`
`image rotates the projector system in one Example in addition to being distorted to
`
`trapezoidal shape when a mirror rotates to a panning direction, and to correct in the
`
`image of the distorted rectangular shape which is nat, the pixel which becomes invalid
`
`increases. in other words, there is a problem that the resolution deteriorates.
`
`fooos}
`
`Further, in the other embodiment, since the projector is rotated, the inertia is large, the
`
`projection image is not suitable for the smooth movement of the projection image, and
`
`

`

`since the projector has various postures, the intemal cooling efficiency is poor, and there
`
`is arisk of deterioration of the optical component, Further, in order to secure the reliability
`
`of connection of a video signal and a cable for supplying power, there is a problem that
`
`a structure becomes complicated or the use of a special connecting component is
`
`considered, and the apparatus becomes large and expensive.
`
`[Means for soiving the problem}
`
`{O00g]
`
`The present invention has been made in order to solve at least some of the above-
`
`mentioned problems, and it is possible to realize the present invention as the following
`
`form or application example.
`
`{0070}
`According ta a 1 aspect of the present invention, there is provided 4 projector system
`
`comprising : a projector which modulates a fight flux emitted from a light source in
`
`accordance withimageinformation to form an image ight : and a projector which projects
`the image light : and a reflection device which reflects the image light. A 1 reflecting
`
`mirror and a 2 reflecting mirror which are arranged oppasite each other and sequentially
`reflect the image light emitted from the projector, and a reflecting surface of the 14
`
`reflecting mirror and the 2 reflecting mirror respectively intersect with each other. A 14
`
`driving part for integrally rotating the 1 reflecting mirror and the 2 reflecting mirror about
`
`a 1 rotating shaft formed on a virtual plane including a normal of each reflecting surface;
`
`Centering on the 2nd axis of rotation that intersects perpendicularly with the ist above-
`
`mentioned axis of rotation, tt has the 2nd driving part that rotates any 1 side at least
`
`among the ist above-mentioned reflection mirror and the 2nd above-mentioned
`
`reflection mirror.
`
`[0041]
`According to this configuration, the projector system can sequentiallyreflect the image
`
`light (projection light) emilited from the projector by the reflection device on the 1
`
`reflection mirror and the 2 reflection mirror, and display the image on a projection surface
`
`such as a@ screen as a projection image. Further, the 7 reflection mirror and the 2
`
`reflection mirror are configured to be rotatable aboul a 1 rotation axis, and at least one
`
`of the 1 reflection mirror andthe 2 reflection mirror is configured to be rotatable about a
`
`4 rotation axis orthogonal to the 2 rotation axis. in other wards, the | reflecting mirror
`
`and the 2 reflecting mirror are configured so as to be rotated in the 1 direction in a state
`
`in which an angle between the first reflecting mirror and the second reflecting mirroris
`
`maintained, and in which at least oneof thefirst and 2 reflecting mirrors is rofated in a 1
`
`direction perpendicular to the first direction.
`
`

`

`[0042]
`
`Thus, in a state where the projector is fixed, the reflection device changes the direction
`
`in which the projection light is reflected in 2 directions, and moves the projection image
`
`projected on the projection surface. For example, a projection image may be Rorzontally
`
`moved by rotating the 1 reflection mirror and the 2 reflection mirror in the 1 direction, and
`
`a projection image may be vertically moved by rotating the 2 reflection mirror in the 2
`direction.
`
`{00143}
`
`Further, when the 1 reflection mirror and the 2 reflection mirror are rotated In the 7
`
`direction, the projection ight whose. reflection direction is changed is a * whose optical
`axis is inclined with respect to a normal lineof the projection surface, and therefore, the
`
`projection light is displayed as a distorted * image in a trapezoidal shape, a rhombic
`
`shape, or the ike onthe projection surface, but the rotation of the image is suppressed.
`in other words, the 1 reflection mirror and the 2 reflection mirror reflect the projection
`
`light sequentially, so that the projection light can be reflacted without being affected by
`the change in the incident angle due to the rotation in the 2 direction, so that the rotation
`
`of the image is suppressed. Thus, the projector system can reduce the correction amount
`
`for correcting the image distortion when the projection image is moved, and can
`
`effectively use the pixel area of the image forming unit for forming the image light
`
`included in the projector, Accordingly, the projector system can move the projection
`
`image projected on the projection surface while suppressing the decrease in resolutian
`
`without moving theprojector.
`
`{o0t4]
`
`in the projector system according to the above application example, it is preferable that
`the projector and the reflection device are arranged such that an optical axis of the image
`
`light emitted fromthe projector is located on the virtual plane of the projector system of
`
`the 2 aspect of the present invention.
`
`[0045]
`
`The larger the amount of rotation of the 1 reflection mirror and the 2 reflection mirror
`
`about the 1 rotation axis, |. e., the larger the angle of the optical axis of the projection
`
`light reflected by the 2 reflection mirror relative to the normal of the projection surface
`
`(hereinafter, referred to as “reflected optical axis"), the larger the amount of * of the
`
`projected image becomes. According to this configuration, since the optical axis of the
`
`projection fight and the 7 rotation axis are located on the virtual plane, the reflection
`
`optical axis is also positioned on the virtual plane. Accordingly, in the projecied image to
`
`

`

`be moved, a distortion * shape is symmetrical between one direction in which the 1
`
`reflection mirror and the 2 reflection mirror are rotated about the 7 rotation axis and the
`
`other direction. Therefore, compared with a configuration in which the aptical axis of the
`
`mrojection light is not located on the virtual plane. it is possible to mave the projection
`
`image with a small correction amount of image distonion, that is, a projection image with
`
`a higher resolution, by effectively using the size of the projection surface.
`
`{0078}
`
`According to a 3 aspect of the present invention, there is provided a projector system
`according to the 1 aspect, further comprising a 3 reflecting mirror which reflects the
`
`image fight onthe front side of the optical path of the first reflecting mirror.
`
`(0017)
`According to this configuration, since theprojector system includes the 3 reflection mirror,
`
`the projection fight can be moved by thereflection device after the direction of the
`
`projection light is changed by the 3 reflection mirror. For example, a projection image
`may be displayed on a projection surface placed on a desk or a floor with a projector
`
`system installed on a ceiling, or a projection image may be displayed on a ceiling with a
`projector system installed on a floor or a desk, and moved. Thus, it is possible ta provide
`
`a projector system which is moreversatile.
`
`[0048]
`
`in the projector system according to the 4 aspect of the present invention, it is preferable
`
`that the projector systern further includes an image correction unit that corrects an image
`
`corresponding to positions of the 1 reflection mirror and the 2 reflection mirror.
`
`{0049}
`
`According to this configuration, the projector system includes an image correction unit,
`
`and the image correction unit corrects an image corresponding to the positions of the 1
`reflection mirror and the 2 reflection mirror. Accordingly, the distortion of the projected
`
`image which is movedby the rotation of the 1 reflecting mirror and the 2 reflecting mirror
`
`can be corrected without performing a specific operation. Thus, convenience of the
`
`projector system is improved,
`
`{Brief Description of the Drawings]
`
`{0020}
`
`[Fig. 1]F iG. 1 is a perspective view schematically showing a projector system according
`to a first embodiment :.
`
`[Fig. 2]Fhe biock diagram showing the schematic structure of the projector system of a
`ist embodiment.
`
`

`

`[Fig. SIF IG. 1 is a perspective view schematically showing a reflection device according
`
`to 4 first embodiment:.
`
`[Fig. 4]The mimetic diagram which looked at the reflective surface in the reflector of a
`
`tst embodiment from the right direction,
`
`{[Fig. SIFIG. 4 is a schematic view of a 1 reflection mirror of the reflection device of the 2
`
`embodiment when viewed fram above ;.
`
`iFig. SIFIG. 4 is a schernatic diagram showing 4 projection image projected by the
`
`projector system according to the 1 embodiment:.
`
`[Fig. 7]FIG.
`
`1
`
`is a schematic view of a movable mirror included in a reflector in a
`
`conventional projector system ;.
`
`[Fig. B]FNG. 3 is 4 view schematically showing a retiecting surface of a conventional
`movable mirror ;.
`
`[Fig. S}FIG.
`
`1
`
`lS a schematic diagram showing a4 projection image projected by a
`
`conventional projector system :.
`[Fig. 10]The mimetic diagram of the reflective surface in the reflector of a Ist embodiment.
`
`[Fig. 11]FiG. 4 is a schematic view of the 1 reflecting mirror and the 2 reflecting mirror of
`the reflecting device of the 1 embodiment viewed from the night :.
`
`[Fig. 12]F1S. 4 is a schematic diagram showing a projection image projected by the
`
`projector system according to the 1 embodiment ;.
`
`[Fig. 13]FIG. 4 is a achematic diagram showing a projection image projected by the
`
`projector system according to the 1 embodiment :.
`
`[Fig. 14]FIG. 2 is a perspective view schematically showing a projector system according
`
`{a a first embodiment ;.
`
`{Mode for carrying out the invention]
`
`[002 4}
`(1 Erabodimens}
`
`Hereinafter. a projector system according to a 7 embadiment will be dascribed with
`reference to the drawings. FIG. 1 is a perspective view achemiatically showing a projector
`
`system 10 accarding to the present embodiment,
`
`As shown in FIG. 1, the projector system 10 includes a projector 1 and a reflection device
`
`2, and reflects the image light (projection light PL} emitted from the projector 1 by the
`
`reflection device 2, and displays the projection image 7 on a prajection surface SC such
`
`as a screen. Then, the projector system 10 moves the projection image 7 by driving the
`reflection device 2.
`
`{0022}
`
`{Main Configuration of Projector]
`
`

`

`First, the projector 1 will be described. A projector 7 modulates a luminous flux emitted
`
`from a light source according to image information to form an image light and projects
`
`the imagelight.
`
`FIG. 2 is a block diagram showing a schematic configuration of the projector system 10.
`
`AS shown in FG. 2, the projector 1 includes a light source unit 11, a liquid crystal light
`
`valve 12 as an image forming unit, a projection optical unit 13, an image input unit 14,
`
`an image processing unit 15, an image correction unit 16, an operation unt 17, a mirror
`
`position input unit 78, and & control unit 19.
`{0023}
`
`The light source unit 11 includes a discharge type fight saurce including an ultra-high
`
`pressure mercury lamp and a metal halide lamp. Then, the ight beam emitted from the
`Hight source unit 141 is transmitted by an optical separation optical system (not shown).
`
`After being separated into 3 color lights of red. (R}, green (G}, and B (blue), which are 3
`
`primary colors of light, the light is incident on a liquid crystal ight valve 12 (iquid crystal
`light valve for R light) provided for each calor light, and is incident on a quid crystal light
`
`valve for 12 R, a liquid crystal light valve for G light is 12 G, and a liquid crystal light valve
`for Blight is 12 B.
`
`{0024}
`
`The image input unit 14 includes various connection terminals for connecting the external
`
`image supply device IS, such as a PC (Personal Computer) or a DVD (Digital Versatile
`
`Disc} reproduction device, to the image processing unit 15.
`
`{0025}
`
`The image processing unit 1S processes the image signal from the image input unit 14
`
`to generate a display image signal so that the display state of the image such as contrast
`and sharpness becomes a desired state, and outputs the processed image signal to the
`
`image correction unit 16.
`
`fo026}
`
`The operation unit 17 includes a plurality of keys for performing various instructions such
`
`as a menu key for switching the display / non-display of a menu image for performing
`
`various settings of the projector 1, a source switching key for switching an input source,
`
`and the Uke.
`
`{0027}
`The mirror position input unit 18 has a connection terminal for connecting the reflection
`
`device 2 and the cable via a cable, and outputs a position signal corresponding to the
`
`position of the 7 reflection mirror 21 and the 2 reflection mirror 22, which will be described
`
`

`

`later, which is input from the reflection device 2, to the contro! unit 19.
`
`{O028]
`
`The contro! unit 19 includes a ROM (Central Processing Unit} including a CPU (Read
`
`Only Memory), a flash memory, and the Uke, a RAM (Random Access Memory) used for
`
`temporarily storing various types of data, and the fike, and functions as a computer.
`When the CPU operates in accordance with a control program stored in the ROM, the
`
`contro] unit 19 contrals the operation of the projector 1.
`
`{0029}
`The image correction unit 16 corrects an image corresponding to the positions of the 7
`
`reflection mirror 21 and the 2 reflection mirror 22. Specifically, upon receiving an
`
`instruction fram the contro! unit 19, the image correction unit 16 corrects the image
`corresponding to the position signal fram the reflection device 2 with respect to the
`
`display image signal output from the image processing untt 15, and outputs the corrected
`
`display image signal to the liquid crystal light valve 12. Further, the image correction unit
`16 is also capable of correcting an image based on an instruction from the operation unit
`
`17.
`
`{0030}
`
`The liquid crystal ight valve 12 modulates each of the incident color lights based on the
`
`display image signal input from the image correction unit 16. Specifically, the liquid
`
`erystal light vaive 12 has a rectangular pixel region in which minute pixels (not shown)
`
`are formed in a matrix. When the display image signal fram the image correction und 16
`
`is input,
`
`the fiquid crystal
`
`light valve 12 sets each pixel
`
`to a light transmittance
`
`corresponding to the display image signal, and forms a display image in the pixel region.
`
`[0031]
`
`When an image is not corrected, the liquid crystal lighf valve 12 forms a display image in
`the entire pixel area based an the display image signal input fram the image correction
`
`uni 16. On the other hand, in the liquid crystal light valve 12, when an image is corrected,
`
`a region (hereinafter, referred to as “non-display region”) of a pixel
`
`that does not
`
`contribute to display is formed in the pixel region based on a display image signal input
`
`from the image correction unit 16.
`
`Each of the modulated color fights is combined for each pixel by a light combining aptical
`
`system (not shown), becomes an image light representing a colar image, and is emitted
`
`to the projection optical unit 73.
`
`{0032}
`
`The projection optical unit 73 is configured as a combination jens in which a plurality of
`
`lenses are combined, and enlarges and projects the image light emitted fram the fight
`
`

`

`combining optical system. Then, the image light (projection light PL} emitted from the
`
`projection optical unit 13 is emitted to the reflection device 2. Note that the projection
`
`optical unit 13 includes a mechanism for adjusting the focus of the projection image 7
`
`and a mechanismfor performing zoom adjustnent (neither of which is shown).
`
`{0033}
`
`iCanfiguration of Reflecting Device]
`
`Next, the reflection device 2 will be described,
`
`The reflection device 2 reflects the image light (projection light PL} emitted from the
`
`projector 1 and causes the projection intage 7 to be displayed on a projection surface
`
`S¢ such as a screen.
`
`FIG. 3 is @ perspective view schematically showing the reflection device 2.
`As shown in FIGS, 2 and3, the reflecting device 2 Inchides a 1 reflecting mirrar 21, a2
`
`reflecting mirror 22, and a second reflecting mirror 32.
`
`A mirror support mechanism 23, a 1 drive unit 24, a 2 drive unit 25, 4 receiving unk 26,
`
`a control unit 27, and @ mirror pasition output unit 28 are provided. As shown in FIG. 3,
`the mirror support mechanism 23 includes a base portion 231, a turntable 232, and a
`
`frame 233.
`
`[O034]
`
`The reflection device 2 sequentially reflects the projection light PL from the 7 reflection
`
`mirror 27 and the 2 reflection mirror 22, and causes the projection surface SC to display
`
`the projection image 7. Then, in the reflection device 2, a state in which the optical axis
`
`freflected optical axis LB) of the projection light PL reflected by the 2 reflectian mirror 22
`
`is substantially parallel to the normal line NV (see FIG. 5) of the projection surface SC is
`
`set as a standard state. By rotating the 1 reflecting mirror 21 and the 2 reflecting mirror
`22, the angie of the reflected optical axis LB with respect to the normalline NV is changed
`
`fo move the positionof the projection image 7. The projector system 10 and the projection
`
`surface SC of the present embodiment are set so that the projection image 7 is displayed
`
`substantially at the center of the prajection surface SC in the reference state.
`
`{O03}
`
`The reflecting device 2 shown in FIG.
`
`1 and FIG. 3 shows a reference state and is
`
`hereinafter referred to as a “reference state". For convenience of explanation,
`
`the
`
`direction of the image light (projection light PL) emitted from the projector 1 is described
`
`as a backward direction (- ¥ direction), the direction in which the projection light PL is
`
`reflacted by the 1 reflection mirror 21 is described as an upward direction (2 direction),
`
`and the direction orthogonal to the Y direction and the Z direction is defined as a right
`
`

`

`side (X direction) as shown In FiG. 3. Further, as shown in Fig, 3, a clackwise rotation
`
`direction as viewed from the upper side (2 direction} is defined as a 1 cw direction, a
`
`counterclockwise rotation direction is defined as a 1 ccw direction, and a clockwise
`
`rotation direction as viewed from the right (X direction} in the reference state is described
`
`as a 2 ow direction, and a counterclockwise rotation direction is deacribed as a 2 ccw
`
`direction.
`
`[0036]
`
`The 1 reflecting mirror 21 has a rectangular reflecting surface 21 A formed by forming a
`
`fim of aluminum or the like on a glass plate and efficiently reflecting the light flux, and
`
`the outer periphery is held by a synthetic resin member. The 1 reflecting mirror 21 is fixed
`
`to the rotating base 232 of the mirror supporting mechanism 23 with an angle of
`approximately 45 degrees with respect to the X-Y plane so as to reflect the projection
`
`fight PL upward din the 2 direction) with respect ie the reflecting surface 21 A.
`
`[6037]
`Similarly to the 2 reflection mirror 21, the 1 reflection mirror 22 has a glass plate member
`
`and a synthetic resin member which holds the outer circumference of the glass plate
`member, and has a rectangular reflection surface 22 A for efficiently reflecting the light
`
`flux. The 2 reflection mirror 22 is disposed above the 1 reflection mirror 21 (2 direction}
`so that the reflection surface 22 A faces the reflection surface 1 A of the 21 reflection
`
`mirror 21, and is rotatably supported by the frame 233.
`
`{0038}
`
`Specifically,
`
`in the reference state, the 2 reflection mirror 22 is arranged so that the
`
`reflection surface 22 A is orthogonal to the reflection surface 27 A, and the angle of the
`
`reflection surface 21 A with respect to the reflection surface 22 A is supported so as to
`
`be changeable. Then, the2 reflection mirror 22 reflects the projection fight PL reflected
`by the 1 reflection mirror 27 toward the front (¥Ydirection}. Note that the 1 reflecting mirror
`
`27 and the 2 reflecting mirror 22 are not limited to glass, and may be formed by forming
`
`a metal filmor the like on a synthetic resin memberorthe like.
`
`{0039}
`
`As described above, the mirror support mechanism 23 includes a base partion 231, a
`
`turntable 232, and a frame 233.
`
`The base portion 237 is a member which supparts the entire reflection device 2 and
`abuts on the installation surface when the reflection device 2 is installed.
`
`fo040}
`
`The rotary table 232 is rotatably supported by the base portion 231. Specifically, the
`
`rofary fable 232 is arranged above the base portion 231 (2 direction) and is rotatable
`
`

`

`about 2 7 rotation axis J 7 extending in the Z direction. [in other words, the rotating table
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`202 is rotatable in the 1 cw direction and the 1 cow direction with respect fo the base
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`portion 231. Further, the 1
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`rotation axis J 1
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`is formed on an imaginary plane VS
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`intersecting a plane along the reflection surfaces 21 A and 22 A and including normal
`lines of ihe reflection surfaces 21 A and 22 A.
`
`{0044]
`
`The frame 233 projects upward from the turntable 292 and is provided in a pair with the
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`+ reflecting mirror 21 interposed therebetween. The frame 233 supports both site
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`surfaces of the 2 reflection mirror 22, and the 2 reflection mirror 22 is rotatable about a
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`2 rotation axis J 2 orthogonal to the virtual plane V5. In other words, the 1 rotation axis
`J 4 and the 2 rotation axis J 2. are orthogonal to each other, and the 2 reflectian mirror
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`22 is rolatabie in the 2 cw direction and the2 ccwdirection in the reference siate.
`
`[0042]
`The 7 drive unit 24 is disposed above the base unit 231 and includes a wheel train partion
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`having a stepping motor, a gear, and ie ike, which are not shown, and rotates the rotary
`table 232 under the control of the control unit 27. In other words, the 1 driving unit 24
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`integrally rotates the 1 reflecting mirror 21 fixed to the rotating table 232 and the 2
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`reflecting mirror 22 supported by theframe 233 around the 1 rotating shaft J 1.
`
`[0043]
`
`The 2 drive unt 25 is disposed on a side of the frame 233 and includes @ wheel train
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`portion having a stepping motor, a gear, and the like, which are not shawn, and rotates
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`the 2 reflection mirror 22 about the 2 rotation shaft J 2 under the contral of the contral
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`unit 27.
`
`[0044]
`The receiving unit 26 receives an operation signal transmitted from the remote cantroller
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`and transmits the operation signal io the contro! unit 27, and includes a light receiving
`
`element, a decoder (neither of which is shown), and the like. The receiving unit 26
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`receives anoptical signal by a light receiving element, converts if into an electric signal,
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`demodulates it, and outputs it to the control unit 27.
`
`{0045}
`
`The contral unit 27 includes a ROM (Central Processing Unid including a CPU (a Read
`
`Only Memory}, 4 flash memory, and the like, and a RAM (a Random Access Memory}
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`used for temporarily storing various types of data {not shown). The control unit 27
`
`controls the operation of the 1 driving unit 24 and the 1 driving unit 25 based on the signal
`
`from the receiving unit 26, and outputs the position signals corresponding to the positions
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`

`

`of the 2 reflecting mirror 21 and the 2 reflecting mirrar 22 to the mirror position output
`
`unit 28.
`
`[0046]
`
`The mirror pasion output unit 28 includes a cannection terminal and outputs the position
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`signal cutout from the control unit 27 to the muror position input unit 18 of the projector
`1 via a cable.
`
`[0047]
`
`The projector 1 andthereflection device 2 are arranged so that an optical axis LA of the
`
`projection light PL is positioned on the virtual plane VS. Further, since the optical axis
`
`LA and the 7 rotation axis J 1 are positioned on the virtual plane VS, the reflection optical
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`axis LB is positioned on the virtual plane VS. Then, the projector system 10 causes the
`projection surface SC ta be displayed on the projection screen SC, and moves the
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`projection image 7 vertically and horizontally by driving the reflection device 2. 7.
`
`[6048]
`fRoute OF PROJECTION LIGHT REFLECTED BY REFLECTION DEVICE]
`
`A path of the projection light PL reflected by the reflection device 2 will be described.
`FIG. 4 is a schematic view of the reflecting surfaces 21 A and 22 A of the reflecting device
`
`2 viewed fromthe right. Specifically, FIG. 4 is a diagram shawing a state B (the reflecting
`
`surface 22 A is indicated by & solid line) in which the 2 reflecting mirror 22 is rotated by
`
`an angle a from the state A ithe reflecting surface 22 A is indicated by a 2 dot chain line)
`
`in the 2 CCW direction.
`
`{0049}
`As shown in FIG. 4, in State A, the incident angle of the projection light PL. (referred to
`
`as PL 2G} incident on the reflecting surface 21 A is 9, and the incident angle of the
`
`projection light PL (referred to as PL 10) incident on the reflecting surface 22 A is 9.
`Since the reflection angles of the projection fights PL 30 and PL 10 on the reflection
`
`surfaces 27 A and 22 A are 6 and @, respectively, the projection light PL (referred to as
`
`PL 10} reflected by the reflection surface 20 A has an angle (referred to as an “emission
`
`angle A") of A= 2 x 82 ™ @ with respect to the projection fight PL 22.
`
`{6050}
`
`in State A, whenthe reflecting surface 27 A and the reflecting surface 22 A are arranged
`
`SO as fo be orthogonal to each other, 8 @ = 90 “, So that A = 780 *.
`
`in other words, a
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`difference in angle between the direction of travel of the projection light PL 1 incident on
`
`the 2 reflection mirror 21 and thedirection of travel of the projection fight PL 10 reflected
`
`by the 30 reflection mirror 22 becomes O when viewed fram the right. That is, the
`
`

`

`projection light PL incident on the 7 reflection mirrer 21 is reflected by the 7 reflection
`
`mirror 21 and the 2 reflection mirror 22 in order and reflected backto the original direction
`
`by so-called retrorefiection.
`
`{0057}
`
`On the other Rand, in ihe state B in which the 2 reflection mirror 22 is rotated by an angie
`
`a in the 2 cew direction from the state A, the projection light PL (referred to as FL 40}
`
`reflected by the reflection surface 22 A has an emission angle of A= 26 2 * ip a). Since
`
`@ @ = 90 “ the injection angle is A = 180 * 2 ¥ a. in other words, the direction of the
`
`projection li