* NOTICE*
`
`JPO and INPIT are not responsible for any damages caused by the use of this transiation.
`
`4. This document has been translated by computer. So the translation may not reflect the original precisely.
`
`2. *** shows a wordwhich cannot be transiated.
`
`3. in the drawings, any wards are not translated.
`
`Publication Number
`
`JP20150319324
`
`Bibliography
`(19) [Publication country] JP
`
`(2) [Kind of official gazette] A
`(11) [Publication number] 2075031932
`{43} [Date of publication of application] 20150216
`
`(54) [Tile of the invention] PROJECTION DIRECTION SWITCHING DEVICE, AND
`
`IMAGE PROJECTOR
`
`(51) finternational Patent Classification]
`
`GOSB 21/28
`HO4N
`5/74
`
`[Fal
`GO3B 21/28
`
`(2006.01)
`(2006.04)
`
`HOdN
`
`5/74
`
`E
`
`(21) [Application number] 2013183772
`
`(22) [Filing date} 20130807
`
`(71) [Apaicand
`
`iName] MOTOCHIGAWA HIROYUKI
`
`iName] NIKKO SHOJ! KK
`(72) finventor]
`
`[Full name] MOTOCHIGAWA HIROYUKI
`
`Thame code {reference}
`
`2K103
`
`5CO5a
`
`iF-tern (reference) ]
`
`ZKTO3AA1E
`
`Z2KTOSAAZS
`
`

`

`Z2K103AB10
`
`2K103BC03
`
`2K1038C19
`
`2k103BC47
`
`2k1032CAt0
`
`2K 103CA20
`
`2K T03CAR2
`
`2K103CA34
`
`2KTQSCA3S
`
`2K TOICAS54
`
`SCOSBEAD2
`
`SCOSSEATS
`
`SCOSBEASZ
`
`Abstract
`
`(57) fOverview]
`PROBLEM TO BE SOLVED: To provide a projection direction switching device that can
`
`switch the direction of projection light emitted fram a projection device easily in various
`
`directions, and an image projector including the projection direction switching device.
`
`SOLUTION: An image projector 10 includes a projection device 20 that can generate
`
`projection fight toward a predetermined direction of an axis line L through a projection
`
`fens 24, and a projection direction switching device 50 that can switch the direction of
`
`projection light emittedfrom the projection device 20. The projection direction switching
`
`device 50 includes a mirror 54 that reflects the projection light made incident fram the
`
`projection device 20, andan attitude adjustment device 56 that can rotate the mirror 54
`around the axis line L. and incline the mirror 54 in a direction intersecting the axis line L.
`
`> laim
`
`[Patent Claims]
`
`fClain 1]
`
`The projection direction switching device is capable of switching the direction of
`
`projection light emitted by a projection device capable of generating projection light in a
`
`predetermined axial direction through a projection lens.
`
`A mirror arranged on an outer peripheral side of the projection fans ;
`
`A projection direction switching device comprising : an attitude adjusting device which
`
`adjusts an inclination of a mirror refative to an axis at an arbitrary positian around an axis.
`
`

`

`Claim 2]
`
`The posture adjusting device includes:
`
`A rotary actuator for rotating the mirror about the axis ;
`
`A projection direction switching device according to chim 1, further comprising an
`
`inclination actuator for changing an inclination of said mirror relative to said axis.
`
`[Claim 3]
`
`A projection device capable of generating projection light
`
`in a predetermined axial
`
`direction througha projection lens ;
`A projection direction switching device is provided which can switch the direction ofthe
`
`projection light emitted by the projection device.
`
`The projection direction switching device is provided.
`A mirror for reflecting the projection light incident fram the projection device ;
`
`An image projection apparatus comprising : an attitude adjusting device capable of
`
`adjusting an inclination of a mirror with respect to the axis at an arbilrary position around
`
`an axis.
`
`iciaim 4}
`The posture adjusting device includes-
`
`A rotary actuator for rotating the mirror about the axis ;
`
`An image projection apparatus according to claim 3, comprising an inclination actuator
`
`for varying aninclination of said mirror relative to said axis.
`
`iClaim 5}
`
`A control device capable of controlling operation of the projection device and the
`
`projection direction switching device is provided.
`
`The control device includes -
`
`An image projection apparatus according to claim 3 or 4, wherein an image adjustment
`signal for adjusting an image output by the projection device is output based on an
`
`attitude of ihe mirror adjusted by the projection direction switching device.
`
`[Claim 6]
`
`A control device capable of controlling the operation of the projection device is provided.
`The contro! device includes-
`
`An image projection apparatus according to any one of claims 3 to 5, wherein an image
`
`adjustment signal for adjusting an nage output by the projection apparatus is output
`
`based on a positional relationship between the projection target and the projection
`
`apparatus.
`
`pClaim 7]
`
`it has an action detection apparatus which can detect the action of a human bady,
`
`

`

`The cantrol device includes :
`
`The image projection apparatus according to claim 5, wherein an atiitude adjusiment
`
`output signal for adjusting an attitude of the mirror by the projection direction switching
`
`deviceis output based on detection information by the behavior detection device.
`
`[Claim 8]
`
`it has an action detection apparatus which can detect the action of a human body,
`
`An image projection. apparatus according ta any one of claims 3 to 7, wherein the
`
`movement of the projection fight emitted by the projection device is blocked by the mirror
`
`or condition that the proximity of the human body to the projection lens is detected by
`
`the behavior detection device.
`
`[Claim 9]
`The control device includes:
`
`if is possible to grasp in advance change information of an image projected by the
`projection device.
`
`Animageé projection apparatus according to any one of claims 5 to 8, wherein an attitude
`adjustment signal for adjusting an attitude of the mirror by the projection direction
`
`switching device is outpul based on the change information.
`
`Description
`
`{Detailed descriotion of the invention]
`
`fTechnical field]
`
`fo004}
`
`The present Invention relates to a projection direction switching device capable of
`
`switching the direction of projection fight emitted by a projection device and an image
`projection device equipped with the projection direction switching device.
`
`{Background of the Invention]
`
`foo02}
`
`in recent years, use of an image projection apparatus such as a projector has been
`
`promoted for the purpose of viewing a video image in a presentation and a home.
`
`in
`
`general, a projector projects projection light projected from a projection lens in a
`
`horizontal or slightly vertical direction, and projects an image on 4 projection surface
`
`such aS a Screen or a wall. However, when there is a situation in which, for example, a
`
`disease or aninjury is not caused due to a disease or an injury, there is a case where an
`
`image is desired to be projected on a ceiling or the like rather than on an erected
`
`projection surface. in addition, in a planetarium, an attraction facility using an image, or
`
`

`

`the like, there is a demand thal a projection direction of an image is changed in a direction
`
`other than a horizontal direction.
`
`{0003}
`
`AS an example of such a request, a video projector disclosed in Patent Document 1 is
`
`provided. This video projector is intended to be used as a projector for a domestic
`
`planetariumand is interchangeable with a projection Jans and includes a converter lens
`
`which can project ar image of a planar chart over a wide range. In this video projector,
`
`by replacing a projection lens with a converter jens, an image of a plane chart can be
`
`projected widely on a ceiling and a wall surface of a roorn, for example.
`
`[Prior art reference]
`
`[Patent document]
`foo
`
`[Patent document 1]JP H 6-273895A
`
`iSummmary of the invention]
`iProblem to be solved by the invention]
`
`{0005}
`Here, it is assumed that a sick person or an inured person cioes net always fle an an
`
`upper side of the body, but changes the directian of the body so as to have a sideways
`
`posture directed to either one of left and right directions. However,
`
`in the above-
`
`described video projector, a projection direction of an image can be changed upward by
`
`replacing a projection fens with a converter lens. but it canmot be easily switched in other
`directions.
`
`foQ08)
`
`Further, assuming that a projector is intended to be used in an attraction facility, there is
`
`& problem inthat it is only possible to project an image upward just as in the case of the
`prior art, and it is possible to use if jn @ static facility such as a planetarium at most. in
`
`other wards, if iis possible to project an image projected by a projector not only in the
`
`ceiling but also in the vertical and horizontal directions in various directions,
`
`if
`
`is
`
`considered thal the entertainment of an attraction facility can be remarkably improved,
`
`but this need carinot be achieved in the prior ar.
`
`{0007}
`
`To provide 2 projection direction switching device capable of easily switching a direction
`
`of projection light emitted by a projection device in various directions, and an image
`
`projection devices equippedwith the projection direction switching device.
`
`it wasconsidered as the object.
`
`

`

`iMeans for solving the problem]
`
`{O08}
`
`The mirror which reflects the incident fight which is a switchable projecting direction
`
`transfer device and entered the direction of the incident light by which the present
`
`invention provided that the problem mentioned above should be solved was emitted
`
`towards the predetermined axial direction with the projection device which can generate
`
`incident light thraugh the projection lens frorn the aferementianed projection device, An
`
`attitude adjusting deviceincludes an attitude adjusting device for adjusting an inclination
`
`of the mirror relative to the axis at an arbitrary position around the axis.
`
`{0009}
`
`The projection direction switching device of the present invention can switch the direction
`of travel of the projection light emitted by the projection device by reflection by the mirror.
`
`Further, in the projection direction switching device of the present invention, by operating
`
`the altitude adjusting device, the attitude of the mirror can be changed. In other words,
`by the operation of the attitude adjusting device, fis passibie to change the inclination
`
`of the mirror relative to the axis at any position in the circumferential direction with respect
`fa the axis which is the direction of generation of the projection fight in the projection
`
`device, Therefore, according to the projection direction switching device of the present
`
`invention,
`
`it
`
`is possible to switch the direction of the projection light emitied by the
`
`projection device to various directions merely by operating the posture acjustment device
`
`and adjusting which of the circumferential positions ihe mirror is inclined.
`
`{0010}
`in the projection direction switching device of the present invention, it is preferable that
`
`the attitude adjusting device includes a rotation actuator for rotating the mirror about the
`
`axis, and an inclination actuator for changing an inclination of the mirror with respect to
`
`the axis.
`
`{0074}
`With such a configuration, the position of the mirror can be adjusted to adjust the position
`
`of the mirror about the axis, and the tit actuator can be actuated to adjust the angle of
`
`the mirror. This allows the direction of the projection light emitted by the projection device
`to be switched in a desired direction.
`
`{0072}
`
`it turns to a predetermined axial direction thraugh a projection lens, and the image movie
`
`projector machine of the present invention provided that the problem mentioned above
`
`should be solved is a projection device which can generate incident light, A projection
`
`direction switching device which can switch the direction of the projection fight emitted
`
`

`

`by the projection device, and the projection direction switching device reflects the
`
`projection fight incident fromm the projection device : An attitude adiusting device includes
`
`an attitude adjusting device for adjusting an inclination of the mirror relative to the axis
`
`at an arbitrary position around the axis.
`
`{0013}
`
`The image projection device according to the invention comprises a projection direction
`
`switching device which can switch the direction of the projection light emitted by the
`
`projection device. Further, the projection direction switching device is provided with a
`
`posture adjusting device in addition to a mirror for switching the traveling direction of the
`
`projection light emitted by the projection device, and can change the alittude of the mirror
`
`in @ direction crossing the direction of generation of the projection light (axial direction}
`and in a direction around the axis. Accordingly, according to the image projection
`
`apparatus of the present invention, it is possible to change the projection direction of an
`
`image by a projection device in an unlong and no longer horizantal direction.
`{0044]
`
`Preferably, the image projection apparatus includes a rotation actuator for rotating the
`mirror about theaxis and an inclination actuator for changing an inclination of the mirror
`
`with respect fo the axis.
`
`{0015}
`
`With this configuration, by operating the rotary actuator and the tit actuator,if is possible
`
`to freely adjust the attitude of the mirror. This alows the direction of the projection light
`
`emitted by the projection device to be switched in a desired direction.
`
`{0016}
`
`An image projection apparatus according to an aspect of the present invention includes
`
`the projection apparatus and the projection direction switching apparatus.
`
`it may be providedthal a possible control device is provided, and that the control device
`
`is capable of outputting an image adjustment signal for adjusting the inage oulput by the
`
`projection device on the basis of the attitude of the mirror adjusted by the projection
`
`direction switching device.
`
`[0047]
`
`As described above, when an atternpt is made to change the projection direction by
`
`changing the posture of the mirror, it is assumed that the image projected by the posture
`
`of the mirror is distorted or inverted.
`
`In an image projection device according fo the
`
`invention, an image oulput by a projection device according to the attitude of a mirror
`
`can be adjusted by a control device. Accordingly, accerding fo the image projection
`
`

`

`apparatus of the present invention, it is possible to optiniize an image projected on a
`
`projection surface such as a wall surface.
`
`{0018}
`
`According to an aspect of the present invention, there is pravided an image. projection
`
`apparatus including a control device capable of controlling the operation of the prajactian
`
`devices, wherein the canitro! device is capable of outputting an iniage adiustment signal
`
`for adjusting an image output by the projection device based on 4 positional relationship
`
`between the projection target and the projection device.
`{0079}
`
`As described above, when an attempt is made to change the projection diraction by
`
`changing theposture of the -muror, it is considered that the positional relationship of the
`wall surface, the screen, and the like with an obisct to be projected changes depending
`
`on the posture. of the mirror. in the image projection apparatus of the present invention,
`
`an output image of a projection device can be controlled by a contro! device according
`to a positional relationship with an object to be projected. Accordingly, according to the
`
`image projection apparatus of the present invention, itis possible to project an image in
`an optimum state taking into consideration a positional relationship with a projection
`
`target.
`
`{0020}
`
`Here, for example, as described above, assuming a situation in which a sick person or
`an injured person uses an image projection apparatus, there is. a possibility that an
`
`operation for switching a projection direction is a complicated or curnbersome operation
`
`for a sick personor the like. In addition, assuming that an image projection apparatus is
`
`introduced into an attraction facility or the like, by changing the projection direction
`
`depending on the behavior of a user, further improvement in performance effect is
`expected. Therefore, it is assumed that the behavior of the human body such as the
`
`turning of the patient and the operation of the user and the like can be detected, and the
`
`projection direction can be switched in conjunction with this, so that an increase in
`
`convenience and 4 performance effect can be expected.
`
`{002 1]
`
`According to an aspect of the present invention, there is provided an image projection
`
`apparatus according ta the present invention, wherein the image projection apparatus
`
`includes a behavior detection device capable of detecting a behavior of a human bady,
`
`and the contro! device outputs an attitude adjustment output signal for adjusting the
`
`posiure of the mirror by the projection direction switching device based on the detection
`
`information by the behavior defection device.
`
`

`

`{0022}
`
`According to this configuration, it is possible to detect the behavior of the human body
`on the basis of the detection information by the behavior detection device, to adjust the
`
`posture of the mirror by the projection direction switching device in conjunction with the
`
`detection, and to switch fhe projection direction. Therefore, according to ihe present
`
`invention, itis possibfe to provide an image projection apparatus which is more excellent
`
`in convenience and performance effect,
`
`{0023}
`in a cammonly used projector or the like, strong projection light is generated in a
`
`projection lens. Therefore, when trying to fook through the projection jens, there is a
`
`problem that a largeloadis applied to the eye and the eyes may be damaged.
`fo024]
`
`According to an aspect of the present invention. there is provided an image projection
`
`apparatus according to the present invention, wherein the image projection apparatus
`includes a behavior detection device capable of detecting a behavior of a hurnan body,
`
`and the traveling of the projection light emitted by the projection device is blocked by the
`mirror on condition that the proximity of the hurnan body to the projection tens is detected
`
`by the behavior detection device.
`
`{0025}
`
`in the image projection device according to the present invention, it is detected that a
`
`human bady is close fo 4 projection lens.
`
`The progress of the projection light emitted by the projection device is blocked by the
`
`mirror provided thatif is detected by the device. Thus, aven Hf 4 person tries to view the
`
`projection lens, the projection fight is blocked by the mirror, thereby preventing the eyes
`from being damaged,
`
`{0026}
`
`Here, assuming that the above-described image projection apparatus is introduced info
`
`an attraction facility or the ike, by changing the projection direction according to the
`
`change of the image projected by the projection apparatus, further improvement of the
`
`performance effect is expected.
`
`[0027]
`
`According tothe imageprojection apparatus of the present invention provided based on
`
`such knowledge, itis possible for the control device to recognize the change information
`
`of the image projected by the projection device in advance and fo output an altitude
`
`adjusiment signal for adjusting the attitude of the murror by the projection direction
`
`

`

`switching device based on the change information.
`
`{O028]
`
`According to this configuration, since the projection direction is switched in conjunction
`
`with the change of the image projected by the projection device, itis possible to improve
`
`the performance effect in the attraction or the like.
`
`fEffect of theInvention]
`
`{0029}
`
`is possible to provide a projection direction
`Bf
`According to the present Invention,
`switching device capable of easily switching the direction of projection fight emitted by a
`
`projection device in various directions, and an image projection apparatus including the
`
`projection direction switching device.
`iBrief Description of the Drawings]
`
`{0030}
`
`[Fig. 1]FIG.
`1
`is @ perspective view showing a schematic configuration of an image
`projection apparatus including a projection direction switching apparatus according io an
`
`embodiment of the present invention |.
`
`{[Fig. 2]FIG. 3 is a perspective view showing an installation example of the image
`
`projection apparatus shown in FIG. tf
`
`:.
`
`[Fig. S|FIG. 1 a is a perspective view showing a projection direction switching device
`
`according to an embodiment of the present invention, and FIG. 1 b is a crass-sectional
`
`viewtaken along line X-X of FRG. 7 a :.
`
`[Fig. 4|FIG. 2 is a block diagram showing a configuration of a cantrol device included in
`
`the image projection apparatus shown in FIG. 15.
`
`[Fig. SJFIG. 4 a is 4 perspective view illustrating a schematic configuration of an image
`
`projection apparatus including a projection direction switching apparatus according to
`another embodiment of the present invention, and FIG. 4 6 is a perspective view
`
`ilustrating an example of an operation of the projection direction swiiching apparatus :.
`
`[Mode for carrying out theinvention]
`
`{00314}
`
`Hereinafter, an image projection apparatus 10 according to an embodiment of the
`
`present invention and a projection direction switching apparatus 50 canstituting the same
`
`wil be described in detail with reference io the accompanying drawings, taking as an
`
`example a position adjacent fo a bed 12 installed in @ hospital or the ike, more
`
`specifically, a position adjacent to the bed head board 14. As shown in FIG. 1, the image
`
`projection device 10 includes a projection device 20, a projection direction switching
`
`device 50, and a control device 70.
`
`

`

`{0032}
`
`The projector 20 is a so-called projector, and forms 4 projection image based on an input
`
`signal
`
`input from an input device 30 such as a personal computer or an apparatus
`
`dedicated to reproduction of an image or.a moving image, and can project the projection
`
`image. As shown in FIG. 1, the input device 30 may be integrated into. the projection
`
`device 20 or may be provided separately fromthe projection device 20.
`
`[0033]
`
`The projection device 20 includes an optical path compenent (not shown) including a
`light source inside the housing 22. The projection device 20 has a projection lens 24 at
`
`a position whichis an outer surface of the housing 22 (a top surface in this embodiment)
`
`and forms an end of an optical path formed inside. A base 24 a is provided at the base
`of the projection lens 22 and protrudes slightly upward from the top of the housing 22.
`
`Thus, # is possitie to prevent the optical path of the projection light reflected by the
`
`projection direction switching device 50, which will be described later in detail, from being
`
`blocked.
`
`H cuts. Further, by projecting the housing 22 only at the portion corresponding te the
`
`projection jens 24, fhe housing 22 can be marie fo have a minunum size. Note thal the
`
`outer shape of the pedestal 22 a may be any shape as jong as the optical path of the
`
`projected light ts not blocked.
`
`{0034}
`
`The projection device 20 is capable of generating the projection light linearly in a
`
`predetermined axial direction through the projection lens 24. The projection device 20
`
`may be provided so as to be capable of generating projection light fram the projection
`
`lens 24 in a lateral direction (a direction inclined vertically or vertically relative to the
`horizontal direction). in this embodiment, the image projection device 10 is installed in a
`
`position adjacent to the bed head board 14 of the bed 12, as shown in FiG. 2, such that
`
`the projection lens 24 is directed upward, |. e@., toward the ceiling side. In addition, when
`
`the projection direction of the projection light is switched to the lower side of the feet of
`
`the user lying on the bed 12 by the projection direction switching device 50, which will be
`
`described in detail later, the optical path is not blocked by the bed head board 14 or the
`
`like, Specifically, as shown in FIG. 2, the profection device 20 js installed on a pedestal
`
`16 disposed on a floor surface, or by a method such as hanging on a bed head board 14
`
`of a wall surface so that the projection direction switching device 50 projects upward
`
`fram an upper end portion of the bed head beard 14.
`
`{0035}
`
`

`

`As shown in FIG. 3, the projection direction switching device 50 includes a mirror 54 and
`
`an attitude adjusting device 56 incorporated in a body case 52. The main body case 62
`
`is a case having a dome-shaped appearance shape formed of a translucent material
`
`such as resin or glass. The main body case 52 is placecl so as to cover the projection
`jens.24.
`
`{0036}
`
`The mirror $4 reflects the prajection light incident from the projection device 20, Further,
`
`the attitude adjusting device 56 is used for aeljusting the attitude of the mirror 54. By
`operating the attitude adjusting device 56, the posture of the mirrar 54 can be freely
`
`changed inside the body case §2. In other words, by operating the posture adjusting
`
`device 66, Nis possible to rotate the mirror 54 around the axis L. of the projection light
`generated in the projection lens 24 (in the direction of arrow A in FIG. 3) and ta
`
`appropriately change the inclination of the mirror 54 with respect to the exis L as indicated
`
`by an arrow 6 in FEG. 3.
`{0037}
`
`The posture adjusting device 56 may be of any configuration as long as Kt can change
`the posture of the mirror 54, but may be, for example, the following. The altitude adjusting
`
`device 56 includes a mirror base 60, a rotary actuator 65, and an inclination actuator 67.
`
`The mirrar base 60 has a doughnut-shaped pedestal partion 62 and a mirror support
`
`mechanism64.
`
`{0038}
`
`An opening region 66 is provided in the center of the base portion 62, and in a state in
`
`which the projection direction switching device 50 is attached to the profection device 20,
`
`the projection light generated from the projection lens 24 can be introduced into the main
`
`body case 52 through the opening region 66. Further, the base partion 62 is rotatable
`about an axis L by operating the rotary actuatar 65. In other words, the mirrar 54 to be
`
`tilted can be positioned around the axis L.
`
`{0039}
`
`The mirror support mechanism 64 is constituted by a hinge mechanism or the like known
`
`in the art, and supports ihe mirror 54 so as to change the inclination. The mirror support
`
`support mechanism 66 is capable of changing the inclination of the mirror 54 byreceiving
`
`power from the HH actuator 67. When the mirror $4is titted, it can be brought inte a state
`
`of crossing a position (an upper position with respect io the opening area 66 in the
`
`present embodiment) of theprojection lightin the traveling direction of the projection light
`
`with respect to an opening area 66 provided in the center of the pedestal pari 62. In other
`
`words, by fitting the mirror 54, if is possible to make the mirror 54 intersect with the axis
`
`

`

`L. Therefore, by inclining the mirror $4, as indicated by an arraw a 1 in FIG. 3b, the
`
`projection light introduced inte the main body case 52 fram the opening region 66
`
`provided in the center of the base portion 62 is reflected by the mirrar 54.
`
`Thus, # is possibie to bend ihe traveling direction of the projected fight. Since the body
`case 52 hasalighttransmitting property overits entire circuniference, the projection ight
`
`{reflected light) reflected by the mirror 54 is emitted ta the outside through the body case
`52.
`
`[0040]
`
`in addition, as shown by a dashed line in FIG. 3, when the mirror $4 is placed in a
`
`standing state, the mirror 54 becomes substantially parallel to the axis L ata position
`deviated from the opening region 66 provided at the center of the base portion G2.
`
`Therefore, when the mirror S4 is erected, the projection light introduced into the main
`
`body case 52 from the opening region 6&6 of the base portion 62 travels straight along
`theaxis L without being reflected by the mirror 54 as indicated by an arrow a 2 in FIG. 3
`
`Q.
`
`{0044}
`
`Further, as shawn by a 2 dot chain line in FIG. 3, by causing the mirror 54 fo be titted so
`
`as to be substantially orthogonal to the axis L, the opening regian 66 is closed, and the
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`progress of the projection light emitted by the projection device 20 is blocked by the
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`mirror 54. in other words, by tifting the mirror $4, the same effect as in the case where
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`the cover is covered with the projection lens 24 is obtained.
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`{0042}
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`The contro] device 70 outputs command signals to the internal mechanism 21 and the
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`projection direction switching device 50 of the projection device 20, and controls these
`operations. The contro! device 70 is constituted by a control device such as a personal
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`computer known in the art. The control device 70 may be separately provided externally,
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`but In the present embodiment, it is incorporated in the projection device 20. The contral
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`unit 70 includes a contral processing unit 72, an input unit 74, and an output unit 76. On
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`the basis of information (input information) which is a reference for adjusting the attitude
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`of the mirror 54 input in the input unit 74, the control unit 70 performs an arithmetic
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`processing in the control processing unit 72, so that various contro] signais can be output
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`fram the output unit 76.
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`{0043}
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`Specifically, an operation device 77 such as a remote controler for performing an
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`operation of the image projection device 10 and various kinds of sensars and devices
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`

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`can be connected to the input unit 74 of the control device 70 via the input device 75. As
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`the sensors and the devices that can be connected to the input unit 74, for example, a
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`behavior detection device 78 for detecting a behavior of a human body, an operation
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`detection sensor, and a sensor 80 such as. an infrared sensor can be employed.
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`{0044}
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`When an operation device 77 is connected to an input part 74, a direction in which an
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`image is projected in a contral processing part 72 and an attitucte of a mirror 44 suitable
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`for projecting an image in the direction are derived based on an operation by an operation
`device. Then, an operation signal {attitude adjustment signal) necessary for obtaining
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`the derived atiitude of the mirror $4 is generated and outputted from the output unit 76
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`toward the attitude adjusting device 66. Thus, the rotation actuator 68 and the tif actuator
`6? are operated to adjust the attitude of he mirrar 54. Similarly, when the behavior
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`detection device 75 for detecting the behavior of a human body and various sensors 80
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`are connected to the input unit 74, generation and output of the pasture adjustment signal
`hased on the behavior detected by the behavior detection unit 78 and the detection result
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`by the sensor 50 are performed, and the posture of the mirror 54 is adjusted.
`[0045]
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`To explain in more detail a case where the behavior detection device 78 is connected ta
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`the input unit 74, a posture adjustment signal for adjusting the direction of the mirror 54
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`is Output so that an image is projected on the ceiling when 4 user, such as a sick person
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`or an injured person lying on a bed, sees the ceiling. In addition, when i is detected by
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`the behavior detection device 78 that the user has changed his posture so as to be
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`directed to the wall surface side due to a turning ar thelike, an attitude adiusiment signal
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`for adjusting the direction of the mirror 54 is output so that an image can be projected on
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`& wail surface in a direction in which the badyof the user faces.
`{0046}
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`Further, the control processing unit 72 is capable of outputting an image adjustment
`signal for adjusting an image output by the projection device 20 based onthe attitude of
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`the mirror adjusted by the projection direction switching device 50. The image adjustment
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`output signal is one or both of the projection device 20 and the input device 30.
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`#t inputs. Thus, the output adjustment of the prajection device 20 and the input device 30
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`is performed so that an image projected on an object to be projected such as a screen,
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`a wail surface, a ceiling surface, or the like, does not have a sense of incongruity such
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`as distortionor inversion.
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`{G047)
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`

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`As described above, the image projection device 10 of the present embodiment includes
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`the projection direction switching device 50, and can switch the traveling direction of the
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`projection light emitted from the projection device 20 by the reflection by the mirror 64.
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`in other words, the projection direction switching device 50 of the present embodiment
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`is capable of changing the posture of the mirror 54. by operating the altitude adjusting
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`device 56 and easily and freely switching the direction of travel of the projected fight to
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`an arbitrary direction. Therefore, ihe image projection apparatus 10 can enjoy an image
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`in an arbitrary posture even if the person is not free of his or her body, Such as a Sick
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`person or an injured person.
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`{0048}
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`in add