WO2020261850A1 - Projection device - Google Patents

Projection device Download PDF

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Publication number
WO2020261850A1
WO2020261850A1 PCT/JP2020/020907 JP2020020907W WO2020261850A1 WO 2020261850 A1 WO2020261850 A1 WO 2020261850A1 JP 2020020907 W JP2020020907 W JP 2020020907W WO 2020261850 A1 WO2020261850 A1 WO 2020261850A1
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WO
WIPO (PCT)
Prior art keywords
image
state
projected image
projected
projection
Prior art date
Application number
PCT/JP2020/020907
Other languages
French (fr)
Japanese (ja)
Inventor
和紀 井上
伊藤　研治
米山　一也
林　健吉
Original Assignee
富士フイルム株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 富士フイルム株式会社 filed Critical 富士フイルム株式会社
Publication of WO2020261850A1 publication Critical patent/WO2020261850A1/en

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor

Definitions

  • the present invention relates to a projection device.
  • Patent Document 1 describes a system in which the projection range of a projection device is variable and the imaging range is controlled according to the set projection range.
  • Patent Document 2 describes a system capable of shifting and zooming the projection area. It is described that the system is designed so that the projection area fits in the captured image regardless of the shift position and zoom state.
  • One embodiment according to the technique of the present disclosure is made in view of the above circumstances, and provides a projection device capable of capturing the entire projected image and being useful for controlling the projected image.
  • the projection device of the present invention includes an optical system that projects an image from a display unit onto a projection object, an image pickup element that captures the projection object through a part of the optical system, and the projection object that is projected onto the projection object.
  • the image pickup element includes a shift mechanism for moving an image in parallel, and has a light receiving surface arranged in a two-dimensional manner in a second direction in which a plurality of pixels intersect the first direction and the first direction.
  • the image in a state where the image projected on the projection object is formed at the position of the light receiving surface by the part of the optical system is used as a projection image, and the projection image is obtained by the shift mechanism.
  • the position in the first direction of the projected image in the state of being moved to one side in one direction is set as the first position, and the projected image is moved to the other side in the first direction by the shift mechanism.
  • the position having the same positional relationship as the first position in the first direction of the projected image in the raised state is defined as the second position, and the position has the same positional relationship as the first position in the first direction of the light receiving surface.
  • the position is the third position
  • the distance between the intermediate position between the first position and the second position and the third position is M
  • the width of the projected image in the first direction is L1
  • the first position is
  • the distance between the first position and the second position is S1
  • the width of the light receiving surface in the first direction is D1
  • the relationship of 0 ⁇ M ⁇ ⁇ D1- (S1 + L1) ⁇ ⁇ 0.5 is established. Is.
  • a projection device capable of capturing the entire projected image and being useful for controlling the projected image.
  • FIG. 3 is a schematic view of the lens 34 of the optical unit 6 in the reference rotation state shown in FIG. 3 as viewed from the screen SC side. It is a schematic diagram for demonstrating the relationship between the image displayed by a display part, and the image projected on a screen. It is a schematic diagram which shows the image which image
  • FIG. 1 is a schematic view showing an external configuration of a projector 100, which is an embodiment of the projection device of the present invention.
  • FIG. 2 is a schematic view showing an example of the internal configuration of the light source unit 11 of FIG.
  • FIG. 3 is a schematic cross-sectional view of the optical unit 6 of the projector 100 shown in FIG. FIG. 3 shows a cross section of the light emitted from the main body 1 along the optical path.
  • the projector 100 includes a main body portion 1 and an optical unit 6 provided so as to project from the main body portion 1.
  • the optical unit 6 includes a first member 2 supported by the main body 1 and a second member 3 rotatably supported by the first member 2.
  • the optical unit 6 may be detachably configured (in other words, interchangeable) in the main body 1.
  • the main body 1 has a housing 15 (see FIG. 3) in which an opening 15a (see FIG. 3) for passing light is formed in a portion connected to the optical unit 6.
  • the light source unit 11 As shown in FIG. 1, inside the housing 15 of the main body 1, the light source unit 11 and the light modulation element that spatially modulates the light emitted from the light source unit 11 based on the input image data to generate an image.
  • An optical modulation unit 12 including 12a (see FIG. 2) is provided.
  • the display unit is composed of the light source unit 11 and the light modulation unit 12.
  • the light source unit 11 includes a light source 41 that emits white light, a color wheel 42, and an illumination optical system 43.
  • the light source 41 is configured to include a light emitting element such as a laser or an LED (Light Emitting Diode).
  • the color wheel 42 is arranged between the light source 41 and the illumination optical system 43.
  • the color wheel 42 is a disk-shaped member, and an R filter that transmits red light, a G filter that transmits green light, and a B filter that transmits blue light are provided along the circumferential direction thereof.
  • the color wheel 42 is rotated about an axis, and the white light emitted from the light source 41 is separated into red light, green light, and blue light in a time-divided manner and guided to the illumination optical system 43.
  • the light emitted from the illumination optical system 43 is incident on the light modulation element 12a.
  • a DMD Digital Micromirror Device
  • LCOS Liquid crystal on silicon
  • MEMS Micro Electro Mechanical Systems
  • liquid crystal display element or the like can also be used.
  • the image formed by the light spatially modulated by the optical modulation unit 12 passes through the opening 15a of the housing 15 and is incident on the optical unit 6 to be projected. It is projected onto the screen SC as an object, and the projected image G1 becomes visible to the observer.
  • the light modulation element 12a has a configuration in which display pixels for forming one pixel of the projected image G1 have a display surface arranged in a two-dimensional manner.
  • the optical unit 6 includes a first member 2 having a hollow portion 2A connected to the inside of the main body portion 1, a second member 3 having a hollow portion 3A connected to the hollow portion 2A, and a hollow portion 2A.
  • the first optical system 21 and the reflecting member 22 arranged, and the second optical system 31, the branch member 32, the third optical system 33, the fourth optical system 37, the image sensor 38, and the lens 34 arranged in the hollow portion 3A.
  • a rotation mechanism 4 and a shift mechanism 5 are provided.
  • the first member 2 is a member having a rectangular cross-sectional outer shape as an example, and the openings 2a and 2b are formed on surfaces perpendicular to each other.
  • the first member 2 is supported by the main body 1 in a state where the opening 2a is arranged at a position facing the opening 15a of the main body 1.
  • the light emitted from the light modulation element 12a of the light modulation unit 12 of the main body 1 passes through the openings 15a and 2a and is incident on the hollow portion 2A of the first member 2.
  • the incident direction of the light incident on the hollow portion 2A from the main body portion 1 is described as the direction X1, the opposite direction of the direction X1 is described as the direction X2, and the direction X1 and the direction X2 are collectively referred to as the direction X.
  • the direction from the front to the back of the paper and the opposite direction are described as the direction Z.
  • the direction from the front to the back of the paper is described as the direction Z1
  • the direction from the back to the front of the paper is described as the direction Z2.
  • the direction perpendicular to the direction X and the direction Z is described as the direction Y, and among the directions Y, the upward direction in FIG. 3 is described as the direction Y1, and the downward direction in FIG. 3 is described as the direction Y2. ..
  • the projector 100 is arranged so that the direction Y2 is the vertical direction.
  • the direction Y constitutes the first direction.
  • the first optical system 21, the reflective member 22, the second optical system 31, the branch member 32, the third optical system 33, and the lens 34 are optical systems for projecting the image formed by the light modulation element 12a onto the screen SC. It constitutes (hereinafter referred to as a projection optical system).
  • FIG. 3 shows the optical axis K of this projection optical system.
  • the first optical system 21, the reflective member 22, the second optical system 31, the branch member 32, the third optical system 33, and the lens 34 are arranged along the optical axis K in this order from the light modulation element 12a side.
  • the light modulation element 12a is eccentrically arranged on the direction Y2 side with respect to the optical axis K.
  • the center of the image formed by the light modulation element 12a does not coincide with the optical axis K and is located on the direction Y2 side of the optical axis K.
  • the first optical system 21 includes at least one lens, and guides light traveling from the main body 1 to the first member 2 in the direction X1 to the reflecting member 22.
  • the reflecting member 22 reflects the light incident from the first optical system 21 in the direction Y1.
  • the reflective member 22 is composed of, for example, a mirror or the like.
  • the first member 2 has an opening 2b formed on the optical path of the light reflected by the reflecting member 22, and the reflected light passes through the opening 2b and proceeds to the hollow portion 3A of the second member 3.
  • the second member 3 is a member having a substantially T-shaped cross section, and an opening 3a is formed at a position facing the opening 2b of the first member 2.
  • the light from the main body 1 that has passed through the opening 2b of the first member 2 is incident on the hollow portion 3A of the second member 3 through the opening 3a.
  • the cross-sectional outer shape of the first member 2 and the second member 3 is arbitrary and is not limited to those described above.
  • the second optical system 31 includes at least one lens, and guides the light incident from the first member 2 to the branch member 32.
  • the branch member 32 reflects the light incident from the second optical system 31 in the direction X2 and guides it to the third optical system 33. Further, the branch member 32 transmits the subject light incident on the lens 34 from the screen SC side and traveling in the direction X1 passing through the third optical system 33, and guides the subject light to the fourth optical system 37.
  • the branch member 32 is composed of a member having a certain thickness, for example, a half mirror or a polarizing plate.
  • the third optical system 33 includes at least one lens, and guides the light reflected by the branch member 32 to the lens 34.
  • the lens 34 is arranged at this end so as to close the opening 3c formed at the end of the second member 3 on the direction X2 side.
  • the lens 34 projects the light incident from the third optical system 33 onto the screen SC.
  • the fourth optical system 37 includes at least one lens and is arranged next to the branch member 32 on the direction X1 side, and guides the subject light that passes through the branch member 32 and travels in the direction X1 to the image sensor 38.
  • the optical axis of the fourth optical system 37 coincides with the optical axis of the lens 34 and the third optical system 33.
  • the fourth optical system 37 may include a lens having a variable focal length.
  • the image sensor 38 is a CCD (Charge Coupled Device) image sensor, a CMOS (Complementary Metal Oxide Semiconductor) image sensor, or the like.
  • the image sensor 38 images the screen SC through the lens 34, the third optical system 33, the branch member 32, and the fourth optical system 37.
  • the lens 34, the third optical system 33, and the branch member 32 form a part of the projection optical system.
  • the rotation mechanism 4 is a mechanism for rotatably connecting the second member 3 to the first member 2.
  • the second member 3 is rotatably configured around a rotation axis (specifically, an optical axis K) extending in the direction Y. That is, the rotation mechanism 4 makes it possible to partially rotate the projection optical system in the optical unit 6.
  • the rotation mechanism 4 is not limited to the arrangement position shown in FIG. 3, as long as the projection optical system can be rotated. Further, the number of rotation mechanisms is not limited to one, and a plurality of rotation mechanisms may be provided.
  • the rotation mechanism 4 causes the second member 3 to be rotated by 90 degrees from the reference rotation state (hereinafter referred to as the reference rotation state) and the rotation state (hereinafter, referred to as the reference rotation state) shown in FIG. A left rotation state), a rotation state rotated 90 degrees to the back side of the paper surface from the reference rotation state (hereinafter referred to as a right rotation state), and a rotation state rotated 180 degrees from the reference rotation state (hereinafter referred to as a 180 degree rotation state). It can take four rotation states. Regardless of which of the four rotational states the second member 3 is in, the screen SC is provided at a position facing the lens 34 and is used.
  • the rotation mechanism 4 may be one that manually rotates the second member 3 or one that electrically rotates the second member 3.
  • the reference rotation state and the 180 degree rotation state each constitute the first state.
  • the counterclockwise rotation state constitutes the second state
  • the clockwise rotation state constitutes the third state.
  • the configuration is such that four rotational states can be taken, but for example, by configuring the first member 2 to be rotatable with respect to the main body 1, it is possible to have a configuration in which more rotational states can be taken.
  • the shift mechanism 5 is a mechanism for moving the optical axis K (in other words, the optical unit 6) of the projection optical system in a direction perpendicular to the optical axis K (direction Y in FIG. 3). Specifically, the shift mechanism 5 is configured so that the position of the first member 2 in the direction Y with respect to the main body 1 can be changed.
  • the shift mechanism 5 may be one that manually moves the first member 2 or one that electrically moves the first member 2.
  • FIG. 3 shows a state in which the first member 2 is moved to the direction Y1 side to the maximum by the shift mechanism 5. From the state shown in FIG. 3, the shift mechanism 5 moves the first member 2 in the direction Y2, so that the positional relationship between the center of the image formed by the light modulation element 12a and the optical axis K changes, and the screen The projected image G1 projected on the SC can be shifted (translated) in the direction Y2.
  • the shift mechanism 5 may be a mechanism that moves the light modulation element 12a in the direction Y instead of moving the optical unit 6 in the direction Y. Even in this case, the projected image G1 projected on the screen SC can be shifted in the direction Y2.
  • FIG. 4 is a schematic view of the lens 34 of the optical unit 6 in the reference rotation state shown in FIG. 3 as viewed from the screen SC side.
  • FIG. 4 shows a straight line l2 that passes through the optical axis K and extends in the direction Y, and a straight line l1 that passes through the optical axis K and extends in the direction Z.
  • the lens 34 can be divided into four regions, region 34A, region 34B, region 34C, and region 34D, by the straight line l1 and the straight line l2.
  • the images generated by the light modulation elements 12a can be ejected from different regions of the lens 34 and projected toward the screen SC according to the rotational state of the second member 3 by the rotation mechanism 4.
  • the projection optical system and the light modulation element 12a have been designed.
  • the first projection mode in which the image is projected from the areas 34A and 34D shown in FIG. 4 toward the screen SC and the first projection mode in which the image is projected from the areas 34A and 34B shown in FIG. 4 toward the screen SC. It is possible to switch between the two projection modes and the third projection mode in which an image is projected from the areas 34C and 34D shown in FIG. 4 toward the screen SC.
  • the rotation state of the second member 3 is the reference rotation state and the rotation state of 180 degrees, in other words, the portion of the optical axis K between the branch member 32 and the lens 34 extends in the direction X. In this state, the image is projected in the first projection mode.
  • the rotation state of the second member 3 is a clockwise rotation state, in other words, the portion of the optical axis K between the branch member 32 and the lens 34 extends in the direction Z, and the lens 34 is the branch member 32.
  • the lens is located closer to the direction Z1, the image is projected in the second projection mode.
  • the rotation state of the second member 3 is the left rotation state, in other words, the portion of the optical axis K between the branch member 32 and the lens 34 extends in the direction Z, and the lens 34 is the branch member 32.
  • the lens is located closer to the direction Z2, the image is projected in the third projection mode.
  • the lens 34, the third optical system 33, the branch member 32, the fourth optical system 37, and the image sensor 38 rotate integrally with the rotation of the second member 3. Therefore, in the following, one side (left side) of the direction Y and the direction perpendicular to the optical axis K (the optical axis of the lens 34 and the third optical system 33) when the lens 34 is viewed from the screen SC side is directed.
  • Z3 is described, and the other side (right side) is described as direction Z4 to define the direction of the internal component of the second member 3. That is, in the example of FIG. 4, the direction Z1 is read as the direction Z3, and the direction Z2 is read as the direction Z4.
  • Direction Z3 and direction Z4 are collectively referred to as direction ZZ, and direction ZZ constitutes the second direction.
  • FIG. 5 is a schematic diagram for explaining the relationship between the image displayed by the display unit and the image projected on the screen.
  • the image d1 generated by the light modulation element 12a in a state where the display surface 12A of the light modulation element 12a is viewed from the opening 15a side in the direction X2 is shown at the uppermost part.
  • the image d1 shows an image of the maximum size that can be projected on the screen SC by the projector 100, in other words, corresponds to a screen on which the image can be displayed.
  • an L-shaped mark is attached to the upper left corner of the image d1, and this mark is for facilitating the recognition of the orientation of the image d1 and is actually projected on the screen SC. is not.
  • the right side in the figure is the direction Z1 side
  • the left side in the figure is the direction Z2 side
  • the upper side in the figure is the direction Y1 side
  • the lower side in the figure is the direction Y2 side.
  • FIG. 5 shows a projected image G1 of the image d1 projected on the screen SC when the screen SC is viewed from the side opposite to the lens 34 side in the reference rotation state, and an image pickup range IM of the image sensor 38 in the screen SC. It is shown.
  • FIG. 5 shows a projected image G1 of the image d1 projected on the screen SC when the screen SC is viewed from the side opposite to the lens 34 side in the counterclockwise rotation state, and an image pickup range IM of the image sensor 38 in the screen SC. It is shown.
  • FIG. 5 shows a projected image G1 of the image d1 projected on the screen SC when the screen SC is viewed from the side opposite to the lens 34 side in the clockwise rotation state, and an image pickup range IM of the image sensor 38 in the screen SC. It is shown.
  • the position of the projected image G1 in the left rotation state and the position of the projected image G1 in the right rotation state have a line-symmetrical relationship with respect to a straight line passing through the optical axis K and extending in the direction Y. Further, the projected image G1 in the left rotation state and the projected image G1 in the right rotation state have a point-symmetrical relationship with respect to the optical axis K.
  • FIG. 5 shows an image G1 of the image d1 projected on the screen SC when the screen SC is viewed from the side opposite to the lens 34 side in a 180-degree rotation state, and an image sensor 38 on the screen SC.
  • the range IM is shown.
  • the position of the projected image G1 in the 180-degree rotation state coincides with the position of the projected image G1 in the reference projection state. Further, the projected image G1 in the 180-degree rotation state is a 180-degree rotation of the projected image G1 in the reference rotation state as it is.
  • the positions of the projected image G1 can take three positions in the imaging range IM depending on the rotational state of the second member 3.
  • the position of the projected image G1 in the reference rotation state and the 180-degree rotation state is a position above the optical axis K in FIG.
  • the position of the projected image G1 in the left rotation state is a position on the left side of the optical axis K in FIG.
  • the position of the projected image G1 in the clockwise rotation state is the position on the right side of the optical axis K in FIG.
  • the region of the projected image G1 in the reference rotation state and the 180 degree rotation state overlaps with the region of the projection image G1 in the left rotation state when this is rotated 90 degrees counterclockwise in FIG.
  • the region of the projected image G1 in the reference rotation state and the 180 degree rotation state overlaps with the region of the projection image G1 in the right rotation state when this is rotated 90 degrees to the right in FIG. 5 around the optical axis K.
  • the projection image shown in the right rotation state of FIG. 5 is transferred from the region of the projection image G1 shown in the left rotation state of FIG.
  • the projected image G1 will move to the region of G1.
  • the projection shown in the left rotation state of FIG. 5 is projected from the region of the projected image G1 shown in the clockwise rotation state of FIG.
  • the projected image G1 will move to the area of the image G1.
  • the shift mechanism 5 may be configured to function only in the reference rotation state and the 180 degree rotation state.
  • the state shown in FIG. 3 may be set as the reference state of the shift mechanism 5, and the image may be projected in this reference state in the left rotation state and the right rotation state.
  • FIG. 6 is a schematic view showing an image formed on the image sensor 38 in each rotation state shown in FIG.
  • FIG. 6 shows the light receiving surface 38a of the image sensor 38.
  • FIG. 6 shows a state in which the image sensor 38 is viewed from the fourth optical system 37 side (a state viewed from the front side).
  • the image sensor 38 has a light receiving surface 38a in which pixels are arranged two-dimensionally in a direction ZZ and a direction Y intersecting the direction ZZ (orthogonal in this embodiment).
  • the light receiving surface 38a has a rectangular shape in which the direction Y is the lateral direction and the direction ZZ is the longitudinal direction. That is, assuming that the length of the light receiving surface 38a in the direction Y is D1 and the length of the light receiving surface 38a in the direction ZZ is D2, the relationship is D2> D1.
  • FIG. 6 the image quality of the subject range formed by the lens 34, the third optical system 33, the branch member 32, and the fourth optical system 37 at the same position as the position of the light receiving surface 38a in the direction X is guaranteed.
  • An imaging image circle PC in a range (a range in which distortion and aberration are sufficiently small) is shown.
  • the center of the imaging image circle PC coincides with the optical axis K
  • the optical axis K coincides with the center C1 of the light receiving surface 38a.
  • FIG. 6 shows a state in which the projected image G1 projected on the screen SC is imaged at the position of the light receiving surface 38a by the lens 34, the third optical system 33, the branch member 32, and the fourth optical system 37.
  • the projected image g1 is shown as the image.
  • FIG. 7 is a schematic view of the display surface of the light modulation element 12a viewed in the direction X2.
  • a display image circle DC which is a range in which image quality is guaranteed (a range with less distortion and aberration) in the light focusing range of the projection optical system It is shown.
  • the center of the display surface 12A is eccentric to the direction Y2 with respect to the center of the display image circle DC.
  • FIG. 8 is a diagram schematically showing the moving range of the projected image when the projected image G1 is moved by the shift mechanism 5 in the reference rotation state or the 180 degree rotation state.
  • the projected image g1 (y1) shown in FIG. 8 is an image of the projected image G1 in a state in which the projected image G1 is maximally moved toward the direction Y1 by the shift mechanism 5 (in other words, the state shown in FIG. 3). The image is shown.
  • the projected image g1 (y2) shown in FIG. 8 shows an image of the projected image G1 in a state where the projected image G1 is maximally moved toward the direction Y2 by the shift mechanism 5.
  • the distance of the surface 38a from the center position (third position) of the direction Y is M
  • the distance between the center positions of the projected images g1 (y1) and g1 (y2) in the direction ZZ and the center position of the light receiving surface 38a is B2.
  • the distance between the center position of the direction ZZ of the projected image g1 in the counterclockwise rotation state and the center position of the direction ZZ of the projected image g1 in the clockwise rotation state is defined as S2.
  • the projected image g1 can be formed on the light receiving surface 38a without omission in any rotational state and shift state.
  • the relational expression between (D) and (E) is for forming the projected image g1 in the light receiving surface 38a in both the left rotation state and the right rotation state.
  • M is set to a value larger than 0 because there is a positional shift in the direction Y of the image that occurs when the image passes through the branch member 32.
  • the image incident on the lens 34 from the screen SC side is slightly displaced in the direction Y due to the thickness of the branch member 32 when passing through the branch member 32.
  • the center of the projected image G1 on the screen SC corresponding to the projected image g1 (y1) shown in FIG. 8 and the projection on the screen SC corresponding to the projected image g1 (y2) shown in FIG. 8 The display unit, the shift mechanism 5, and the projection optical system are designed so that the optical axis K intersects the center of the image G1. By doing so, the quality of the projected image G1 corresponding to the projected image g1 (y1) and the quality of the projected image G1 corresponding to the projected image g1 (y2) can be made uniform. Moreover, the design of the shift mechanism 5 can be facilitated.
  • the minimum value of M is a value (a value larger than 0) corresponding to the amount of image deviation caused by the thickness of the branch member 32.
  • the optical unit 6 and the display unit are configured so that the relational expressions (A), (B), and (C) above are satisfied. Therefore, the design of the shift mechanism 5 and the projection optical system can be facilitated, and the manufacturing cost can be reduced.
  • the optical axis K and the center of the light receiving surface 38a can be aligned with each other, which has advantages in manufacturing (existing alignment technology can be used, etc.) and in image processing (images captured according to optical characteristics). It is possible to form an image of the projected image g1 on the light receiving surface 38a without omission while enjoying (such as facilitating the correction process).
  • the optical unit 6 is further configured so that the relational expressions (D) and (E) above are satisfied. Therefore, even when the projected image G1 is rotated, the projected image g1 can be imaged on the light receiving surface 38a without omission.
  • the optical unit 6 is further configured so that the relational expression (C) above holds.
  • the relational expression (C) defines the position of the direction ZZ of the projected image g1 in the reference rotation state and the 180 degree rotation state.
  • B2 0 that is, at a position close to the center of the image pickup image circle PC.
  • the projected image g1 can be imaged. Therefore, the quality of the captured image can be improved.
  • the size of one pixel of the projected image g1 is equal to or larger than the size of one pixel of the light receiving surface 38a. By doing so, one pixel of the projected image g1 can be imaged by one or more pixels of the image sensor 38, and high-resolution imaging becomes possible.
  • the radius of the imaged image circle PC is set to R3
  • the radius of the display image circle DC is set to R1
  • the size of the light receiving surface 38a is set to R1.
  • the projector 100 can rotate a part of the projection optical system by the rotation mechanism 4, but the rotation mechanism 4 is not essential.
  • the rotation mechanism 4 may be deleted from the projector 100 so that the image can be projected only in the reference rotation state described above.
  • the projector 100 may be designed so that the relational expressions (A), (B), and (C) above are satisfied.
  • M is an intermediate position between the center of the direction Y of the projected image g1 (y1) and the center of the direction Y of the projected image g1 (y2), and the center of the direction Y of the light receiving surface 38a.
  • the distance to the position is used, but it is not limited to this.
  • the ratio of the distance from the end position of Y2 to the first position is defined as the first ratio
  • the ratio of the distance to the distance from the position of the end of the direction Y2 of the projected image g1 (y2) to this second position is defined as the second ratio.
  • the third ratio In this case, the first position, the second position, and the third position are the positions where the first ratio, the second ratio, and the third ratio are the same, and the above "M" is the intermediate position between the first position and the second position. May be replaced with the distance between and the third position.
  • the configuration in which the first ratio, the second ratio, and the third ratio are 1: 1 respectively is the configuration shown in FIG.
  • S2 described with reference to FIG. 6 is the distance between the center position of the direction ZZ of the projected image g1 in the counterclockwise rotation state and the center position of the direction ZZ of the projected image g1 in the clockwise rotation state. Not limited to this.
  • the ratio with the distance be the fourth ratio.
  • the fifth position is obtained from the distance from the end position of the direction Z3 of the projected image g1 in the direction ZZ to an arbitrary position (fifth position) and the position of the end of the direction Z4 of the projected image g1.
  • the ratio to the distance to the position is defined as the fifth ratio.
  • the fourth position and the fifth position may be the positions where the fourth ratio and the fifth ratio are the same, and the above “S2" may be replaced with the distance between the fourth position and the fifth position.
  • the configuration in which the fourth ratio and the fifth ratio are 1: 1 respectively is the configuration shown in FIG.
  • the projection image G1 in the reference rotation state is rotated 90 degrees clockwise in the figure by the rotation mechanism 4, and the projection image G1 in the reference rotation state is in the figure. It is assumed that it can be rotated 90 degrees counterclockwise.
  • the rotation angle of the projected image G1 when the projected image G1 is configured to be rotatable is not limited to 90 degrees, and any rotation angle can be adopted.
  • the optical unit 6 of the projector 100 simply uses the branch member 32 as a mirror, and reflects the light emitted from the lens 34 in front of the lens 34 and projects it onto the screen SC, and transmits the subject light from the screen SC.
  • a member similar to the branch member 32 may be arranged, and the fourth optical system 37 and the image pickup element 38 may be arranged on the optical path of the light transmitted through the optical member.
  • An optical system that projects an image from the display onto an object to be projected, An image sensor that images the projection object through a part of the optical system, A shift mechanism for translating the image projected on the projection object is provided.
  • the image pickup device has a light receiving surface in which a plurality of pixels are two-dimensionally arranged in a first direction and a second direction in which the first direction intersects.
  • the image in a state where the image projected on the projection object is formed at the position of the light receiving surface by the part of the optical system is used as a projection image, and the projection image is obtained by the shift mechanism.
  • the position in the first direction of the projected image in the state of being moved to one side in one direction is set as the first position, and the projected image is moved to the other side in the first direction by the shift mechanism.
  • the position having the same positional relationship as the first position in the first direction of the projected image in the projected state is defined as the second position, and the position has the same positional relationship as the first position in the first direction of the light receiving surface.
  • the position is the third position, the distance between the intermediate position between the first position and the second position and the third position is M, the width of the projected image in the first direction is L1, and the first position.
  • the distance between the first position and the second position is S1 and the width of the light receiving surface in the first direction is D1.
  • the projection device is the center position of the projected image in the first direction.
  • the second position is the center position of the projected image in the first direction.
  • the third position is a projection device which is the center position of the light receiving surface in the first direction.
  • the projection device according to the above.
  • the radius of the imaging image circle in the subject range imaged at the position of the light receiving surface by the part of the optical system is R3, and the light condensing range of the optical system at the position of the display unit.
  • the radius of the display image circle is R1
  • the size of the pixel on the light receiving surface is P3
  • the size of the display pixel of the display unit is P1.
  • the projection device according to any one of (1) to (4). Equipped with a rotation mechanism that rotates the above optical system
  • the rotation mechanism has a first state in which one side of the projected image is parallel to the first direction, and a second state in which the projected image is rotated in one rotation direction with respect to the first state.
  • the image is rotated between the state and the third state in which the projected image is rotated in the other rotation direction with respect to the first state.
  • the above relationship of 0 ⁇ M ⁇ ⁇ D1- (S1 + L1) ⁇ ⁇ 0.5 holds.
  • a projection device in which the projected image is formed in the light receiving surface in each of the second state and the third state.
  • the projection device is the center position of the projected image in the second direction.
  • the fifth position is a projection device which is the center position of the projected image in the second direction.
  • the projection device according to any one of (1) to (7).
  • the part of the optical system is a projection device including an optical member that reflects an image from the display unit and guides the image to the projection object, and transmits light from the projection object to guide the image sensor. ..
  • the projection device is a projection device that is a half mirror or a polarizing plate.

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Abstract

Provided is a projection device capable of imaging an entire projected image so as to assist control, etc., of the projected image. A projection captured image g1 is obtained in a state where an image projected on a screen SC is formed at the position of a light reception surface (38a). 0<M≤{D1-(S1+L1)}×0.5 is satisfied, when M represents the distance between the center position of the light reception surface (38a) in a direction Y and an intermediate position between the center position of a projection captured image g1(y1) in the direction Y in a state of being maximally moved on a direction Y1 side by a shift mechanism (5) and the center position of a projection captured image g1(y2) in the direction Y in a state of maximally being moved on a direction Y2 side, L1 represents the width of the projection captured image g1, S1 represents the distance between the center positions of the projection captured image g1(y1) and the projection captured image g1 (y2) in the direction Y, and D1 represents the width of the light reception surface (38a) in the direction Y,.

Description

投影装置Projection device
　本発明は、投影装置に関する。 The present invention relates to a projection device.
　撮像装置と投影装置とを組み合わせたシステムが提案されている。例えば、特許文献１には、投影装置の投影範囲が可変であり、設定された投影範囲に応じて撮像範囲を制御するシステムが記載されている。 A system that combines an imaging device and a projection device has been proposed. For example, Patent Document 1 describes a system in which the projection range of a projection device is variable and the imaging range is controlled according to the set projection range.
　特許文献２には、投射領域のシフトとズームが可能なシステムが記載されている。このシステムでは、どのようなシフト位置及びズーム状態であっても、投射領域が撮像画像に収まるように設計されることが記載されている。 Patent Document 2 describes a system capable of shifting and zooming the projection area. It is described that the system is designed so that the projection area fits in the captured image regardless of the shift position and zoom state.
日本国特開２００９－３０２８１４号公報Japanese Patent Application Laid-Open No. 2009-302814 日本国特開２０１６－１９７７６８号公報Japanese Patent Application Laid-Open No. 2016-1977768
　本開示の技術に係る１つの実施形態は、上記事情に鑑みてなされたものであり、投影画像の全体を撮像可能として投影画像の制御等に役立てることのできる投影装置を提供する。 One embodiment according to the technique of the present disclosure is made in view of the above circumstances, and provides a projection device capable of capturing the entire projected image and being useful for controlling the projected image.
　本発明の投影装置は、表示部からの画像を投影対象物に投影する光学系と、上記光学系の一部を通して上記投影対象物を撮像する撮像素子と、上記投影対象物に投影される上記画像を平行移動させるシフト機構と、を備え、上記撮像素子は、複数の画素が第一方向と上記第一方向に交差する第二方向とに二次元状に配置された受光面を有し、上記投影対象物に投影された上記画像が上記光学系の上記一部によって上記受光面の位置に結像された状態におけるその画像を投影撮像画像とし、上記シフト機構によって上記投影撮像画像が上記第一方向の一方側に最大限移動された状態におけるその投影撮像画像の上記第一方向の位置を第一位置とし、上記シフト機構によって上記投影撮像画像が上記第一方向の他方側に最大限移動された状態におけるその投影撮像画像の上記第一方向において上記第一位置と同じ位置関係にある位置を第二位置とし、上記受光面の上記第一方向において上記第一位置と同じ位置関係にある位置を第三位置とし、上記第一位置と上記第二位置との中間位置と、上記第三位置との距離をＭとし、上記投影撮像画像の上記第一方向の幅をＬ１とし、上記第一位置と上記第二位置の距離をＳ１とし、上記受光面の上記第一方向の幅をＤ１とした場合に、０＜Ｍ≦｛Ｄ１－（Ｓ１＋Ｌ１）｝×０．５の関係が成り立つものである。 The projection device of the present invention includes an optical system that projects an image from a display unit onto a projection object, an image pickup element that captures the projection object through a part of the optical system, and the projection object that is projected onto the projection object. The image pickup element includes a shift mechanism for moving an image in parallel, and has a light receiving surface arranged in a two-dimensional manner in a second direction in which a plurality of pixels intersect the first direction and the first direction. The image in a state where the image projected on the projection object is formed at the position of the light receiving surface by the part of the optical system is used as a projection image, and the projection image is obtained by the shift mechanism. The position in the first direction of the projected image in the state of being moved to one side in one direction is set as the first position, and the projected image is moved to the other side in the first direction by the shift mechanism. The position having the same positional relationship as the first position in the first direction of the projected image in the raised state is defined as the second position, and the position has the same positional relationship as the first position in the first direction of the light receiving surface. The position is the third position, the distance between the intermediate position between the first position and the second position and the third position is M, the width of the projected image in the first direction is L1, and the first position is When the distance between the first position and the second position is S1 and the width of the light receiving surface in the first direction is D1, the relationship of 0 <M ≦ {D1- (S1 + L1)} × 0.5 is established. Is.
　本発明によれば、投影画像の全体を撮像可能として投影画像の制御等に役立てることのできる投影装置を提供することができる。 According to the present invention, it is possible to provide a projection device capable of capturing the entire projected image and being useful for controlling the projected image.
本発明の投影装置の一実施形態であるプロジェクタ１００の外観構成を示す模式図である。It is a schematic diagram which shows the appearance structure of the projector 100 which is one Embodiment of the projection apparatus of this invention. 図１の光源ユニット１１の内部構成の一例を示す模式図である。It is a schematic diagram which shows an example of the internal structure of the light source unit 11 of FIG. 図１に示すプロジェクタ１００の光学ユニット６の断面模式図である。It is sectional drawing of the optical unit 6 of the projector 100 shown in FIG. 図３に示す基準回転状態における光学ユニット６のレンズ３４をスクリーンＳＣ側から見た模式図である。FIG. 3 is a schematic view of the lens 34 of the optical unit 6 in the reference rotation state shown in FIG. 3 as viewed from the screen SC side. 表示部によって表示される画像とスクリーンに投影される画像との関係を説明するための模式図である。It is a schematic diagram for demonstrating the relationship between the image displayed by a display part, and the image projected on a screen. 図５に示した各回転状態において撮像素子３８に結像する画像を示す模式図である。It is a schematic diagram which shows the image which image | formed on the image sensor 38 in each rotation state shown in FIG. 光変調素子１２ａの表示面を方向Ｘ２に見た模式図である。It is a schematic diagram which looked at the display surface of the light modulation element 12a in the direction X2. 基準回転状態又は１８０度回転状態においてシフト機構５により投影画像Ｇ１を移動させた場合の投影撮像画像の移動範囲を模式的に示す図である。It is a figure which shows typically the moving range of the projected image when the projected image G1 is moved by the shift mechanism 5 in the reference rotation state or the 180 degree rotation state.
　以下、本発明の実施形態について図面を参照して説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
　図１は、本発明の投影装置の一実施形態であるプロジェクタ１００の外観構成を示す模式図である。図２は、図１の光源ユニット１１の内部構成の一例を示す模式図である。図３は、図１に示すプロジェクタ１００の光学ユニット６の断面模式図である。図３は、本体部１から出射される光の光路に沿った面での断面を示している。 FIG. 1 is a schematic view showing an external configuration of a projector 100, which is an embodiment of the projection device of the present invention. FIG. 2 is a schematic view showing an example of the internal configuration of the light source unit 11 of FIG. FIG. 3 is a schematic cross-sectional view of the optical unit 6 of the projector 100 shown in FIG. FIG. 3 shows a cross section of the light emitted from the main body 1 along the optical path.
　図１に示すように、プロジェクタ１００は、本体部１と、本体部１から突出して設けられた光学ユニット６と、を備える。光学ユニット６は、本体部１に支持される第一部材２と、第一部材２に回転自在に支持された第二部材３と、を備える。なお、光学ユニット６は、本体部１に着脱自在に構成（換言すると交換可能に構成）されていてもよい。 As shown in FIG. 1, the projector 100 includes a main body portion 1 and an optical unit 6 provided so as to project from the main body portion 1. The optical unit 6 includes a first member 2 supported by the main body 1 and a second member 3 rotatably supported by the first member 2. The optical unit 6 may be detachably configured (in other words, interchangeable) in the main body 1.
　本体部１は、光学ユニット６と連結される部分に光を通すための開口１５ａ（図３参照）が形成された筐体１５（図３参照）を有する。 The main body 1 has a housing 15 (see FIG. 3) in which an opening 15a (see FIG. 3) for passing light is formed in a portion connected to the optical unit 6.
　本体部１の筐体１５の内部には、図１に示すように、光源ユニット１１と、光源ユニット１１から出射される光を入力画像データに基づいて空間変調して画像を生成する光変調素子１２ａ（図２参照）を含む光変調ユニット１２と、が設けられている。光源ユニット１１と光変調ユニット１２によって表示部が構成される。 As shown in FIG. 1, inside the housing 15 of the main body 1, the light source unit 11 and the light modulation element that spatially modulates the light emitted from the light source unit 11 based on the input image data to generate an image. An optical modulation unit 12 including 12a (see FIG. 2) is provided. The display unit is composed of the light source unit 11 and the light modulation unit 12.
　図２に示す例では、光源ユニット１１は、白色光を出射する光源４１と、カラーホイール４２と、照明光学系４３と、を備える。光源４１は、レーザ又はＬＥＤ（Ｌｉｇｈｔ　Ｅｍｉｔｔｉｎｇ　Ｄｉｏｄｅ）等の発光素子を含んで構成される。カラーホイール４２は、光源４１と照明光学系４３の間に配置されている。カラーホイール４２は、円板状の部材であり、その周方向に沿って、赤色光を透過するＲフィルタ、緑色光を透過するＧフィルタ、及び青色光を透過するＢフィルタが設けられている。カラーホイール４２は軸周りに回転され、光源４１から出射される白色光を時分割にて赤色光、緑色光、及び青色光に分光して照明光学系４３に導く。照明光学系４３から出射された光は光変調素子１２ａに入射される。 In the example shown in FIG. 2, the light source unit 11 includes a light source 41 that emits white light, a color wheel 42, and an illumination optical system 43. The light source 41 is configured to include a light emitting element such as a laser or an LED (Light Emitting Diode). The color wheel 42 is arranged between the light source 41 and the illumination optical system 43. The color wheel 42 is a disk-shaped member, and an R filter that transmits red light, a G filter that transmits green light, and a B filter that transmits blue light are provided along the circumferential direction thereof. The color wheel 42 is rotated about an axis, and the white light emitted from the light source 41 is separated into red light, green light, and blue light in a time-divided manner and guided to the illumination optical system 43. The light emitted from the illumination optical system 43 is incident on the light modulation element 12a.
　光変調ユニット１２に含まれる光変調素子１２ａは、図２の光源ユニット１１の構成であればＤＭＤ（Ｄｉｇｉｔａｌ　Ｍｉｃｒｏｍｉｒｒｏｒ　Ｄｅｖｉｃｅ）が例えば用いられる。光変調素子１２ａとしては、ＬＣＯＳ（Ｌｉｑｕｉｄ　ｃｒｙｓｔａｌ　ｏｎ　ｓｉｌｉｃｏｎ）、ＭＥＭＳ（Ｍｉｃｒｏ　Ｅｌｅｃｔｒｏ　Ｍｅｃｈａｎｉｃａｌ　Ｓｙｓｔｅｍｓ）素子、又は液晶表示素子等を用いることもできる。図３に示すように、光変調ユニット１２によって空間変調された光によって形成される画像（表示部の表示画像）は、筐体１５の開口１５ａを通過して光学ユニット６に入射され、投影対象物としてのスクリーンＳＣに投影されて、投影画像Ｇ１が観察者から視認可能となる。 As the light modulation element 12a included in the light modulation unit 12, a DMD (Digital Micromirror Device) is used, for example, in the case of the configuration of the light source unit 11 of FIG. As the light modulation element 12a, an LCOS (Liquid crystal on silicon) element, a MEMS (Micro Electro Mechanical Systems) element, a liquid crystal display element, or the like can also be used. As shown in FIG. 3, the image formed by the light spatially modulated by the optical modulation unit 12 (display image of the display unit) passes through the opening 15a of the housing 15 and is incident on the optical unit 6 to be projected. It is projected onto the screen SC as an object, and the projected image G1 becomes visible to the observer.
　光変調素子１２ａは、この投影画像Ｇ１の１画素を形成するための表示画素が二次元状に配置された表示面を有する構成である。 The light modulation element 12a has a configuration in which display pixels for forming one pixel of the projected image G1 have a display surface arranged in a two-dimensional manner.
　図３に示すように、光学ユニット６は、本体部１の内部と繋がる中空部２Ａを有する第一部材２と、中空部２Ａと繋がる中空部３Ａを有する第二部材３と、中空部２Ａに配置された第一光学系２１及び反射部材２２と、中空部３Ａに配置された第二光学系３１、分岐部材３２、第三光学系３３、第四光学系３７、撮像素子３８、及びレンズ３４と、回転機構４と、シフト機構５と、を備える。 As shown in FIG. 3, the optical unit 6 includes a first member 2 having a hollow portion 2A connected to the inside of the main body portion 1, a second member 3 having a hollow portion 3A connected to the hollow portion 2A, and a hollow portion 2A. The first optical system 21 and the reflecting member 22 arranged, and the second optical system 31, the branch member 32, the third optical system 33, the fourth optical system 37, the image sensor 38, and the lens 34 arranged in the hollow portion 3A. A rotation mechanism 4 and a shift mechanism 5 are provided.
　第一部材２は、断面外形が一例として矩形の部材であり、開口２ａと開口２ｂが互いに垂直な面に形成されている。第一部材２は、本体部１の開口１５ａと対面する位置に開口２ａが配置される状態にて、本体部１によって支持されている。本体部１の光変調ユニット１２の光変調素子１２ａから射出された光は、開口１５ａ及び開口２ａを通って第一部材２の中空部２Ａに入射される。 The first member 2 is a member having a rectangular cross-sectional outer shape as an example, and the openings 2a and 2b are formed on surfaces perpendicular to each other. The first member 2 is supported by the main body 1 in a state where the opening 2a is arranged at a position facing the opening 15a of the main body 1. The light emitted from the light modulation element 12a of the light modulation unit 12 of the main body 1 passes through the openings 15a and 2a and is incident on the hollow portion 2A of the first member 2.
　本体部１から中空部２Ａに入射される光の入射方向を方向Ｘ１と記載し、方向Ｘ１の逆方向を方向Ｘ２と記載し、方向Ｘ１と方向Ｘ２を総称して方向Ｘと記載する。また、図３において、紙面手前から奥に向かう方向とその逆方向を方向Ｚと記載する。方向Ｚのうち、紙面手前から奥に向かう方向を方向Ｚ１と記載し、紙面奥から手前に向かう方向を方向Ｚ２と記載する。また、方向Ｘ及び方向Ｚに垂直な方向を方向Ｙと記載し、方向Ｙのうち、図３において上に向かう方向を方向Ｙ１と記載し、図３において下に向かう方向を方向Ｙ２と記載する。図３の例では、方向Ｙ２が鉛直方向となるようにプロジェクタ１００が配置されている。本明細書においては、方向Ｙは第一方向を構成する。 The incident direction of the light incident on the hollow portion 2A from the main body portion 1 is described as the direction X1, the opposite direction of the direction X1 is described as the direction X2, and the direction X1 and the direction X2 are collectively referred to as the direction X. Further, in FIG. 3, the direction from the front to the back of the paper and the opposite direction are described as the direction Z. Of the directions Z, the direction from the front to the back of the paper is described as the direction Z1, and the direction from the back to the front of the paper is described as the direction Z2. Further, the direction perpendicular to the direction X and the direction Z is described as the direction Y, and among the directions Y, the upward direction in FIG. 3 is described as the direction Y1, and the downward direction in FIG. 3 is described as the direction Y2. .. In the example of FIG. 3, the projector 100 is arranged so that the direction Y2 is the vertical direction. In the present specification, the direction Y constitutes the first direction.
　第一光学系２１、反射部材２２、第二光学系３１、分岐部材３２、第三光学系３３、及びレンズ３４は、光変調素子１２ａによって形成された画像をスクリーンＳＣに投影するための光学系（以下、投影光学系という）を構成している。図３には、この投影光学系の光軸Ｋが示されている。第一光学系２１、反射部材２２、第二光学系３１、分岐部材３２、第三光学系３３、及びレンズ３４は、光変調素子１２ａ側からこの順に光軸Ｋに沿って配置されている。図３の例では、光変調素子１２ａは、光軸Ｋよりも方向Ｙ２側に偏心して配置されている。換言すると、光変調素子１２ａによって形成される画像の中心（後述の表示面１２Ａの中心）は、光軸Ｋとは一致しておらず、光軸Ｋよりも方向Ｙ２側に位置する。 The first optical system 21, the reflective member 22, the second optical system 31, the branch member 32, the third optical system 33, and the lens 34 are optical systems for projecting the image formed by the light modulation element 12a onto the screen SC. It constitutes (hereinafter referred to as a projection optical system). FIG. 3 shows the optical axis K of this projection optical system. The first optical system 21, the reflective member 22, the second optical system 31, the branch member 32, the third optical system 33, and the lens 34 are arranged along the optical axis K in this order from the light modulation element 12a side. In the example of FIG. 3, the light modulation element 12a is eccentrically arranged on the direction Y2 side with respect to the optical axis K. In other words, the center of the image formed by the light modulation element 12a (the center of the display surface 12A described later) does not coincide with the optical axis K and is located on the direction Y2 side of the optical axis K.
　第一光学系２１は、少なくとも１つのレンズを含み、本体部１から第一部材２に入射された方向Ｘ１に進む光を反射部材２２に導く。 The first optical system 21 includes at least one lens, and guides light traveling from the main body 1 to the first member 2 in the direction X1 to the reflecting member 22.
　反射部材２２は、第一光学系２１から入射された光を方向Ｙ１に反射させる。反射部材２２は、例えばミラー等によって構成される。第一部材２には、反射部材２２にて反射した光の光路上に開口２ｂが形成されており、この反射した光は開口２ｂを通過して第二部材３の中空部３Ａへと進む。 The reflecting member 22 reflects the light incident from the first optical system 21 in the direction Y1. The reflective member 22 is composed of, for example, a mirror or the like. The first member 2 has an opening 2b formed on the optical path of the light reflected by the reflecting member 22, and the reflected light passes through the opening 2b and proceeds to the hollow portion 3A of the second member 3.
　第二部材３は、断面外形が略Ｔ字状の部材であり、第一部材２の開口２ｂと対面する位置に開口３ａが形成されている。第一部材２の開口２ｂを通過した本体部１からの光は、この開口３ａを通って第二部材３の中空部３Ａに入射される。なお、第一部材２や第二部材３の断面外形は任意であり、上述したものには限定されない。 The second member 3 is a member having a substantially T-shaped cross section, and an opening 3a is formed at a position facing the opening 2b of the first member 2. The light from the main body 1 that has passed through the opening 2b of the first member 2 is incident on the hollow portion 3A of the second member 3 through the opening 3a. The cross-sectional outer shape of the first member 2 and the second member 3 is arbitrary and is not limited to those described above.
　第二光学系３１は、少なくとも１つのレンズを含み、第一部材２から入射された光を、分岐部材３２に導く。 The second optical system 31 includes at least one lens, and guides the light incident from the first member 2 to the branch member 32.
　分岐部材３２は、第二光学系３１から入射される光を方向Ｘ２に反射させて第三光学系３３に導く。また、分岐部材３２は、スクリーンＳＣ側からレンズ３４に入射されて第三光学系３３を通過した方向Ｘ１に進む被写体光を透過させて、第四光学系３７に導く。分岐部材３２は、ある程度の厚みを持つ部材、例えばハーフミラー又は偏光板等によって構成される。 The branch member 32 reflects the light incident from the second optical system 31 in the direction X2 and guides it to the third optical system 33. Further, the branch member 32 transmits the subject light incident on the lens 34 from the screen SC side and traveling in the direction X1 passing through the third optical system 33, and guides the subject light to the fourth optical system 37. The branch member 32 is composed of a member having a certain thickness, for example, a half mirror or a polarizing plate.
　第三光学系３３は、少なくとも１つのレンズを含み、分岐部材３２にて反射された光をレンズ３４に導く。 The third optical system 33 includes at least one lens, and guides the light reflected by the branch member 32 to the lens 34.
　レンズ３４は、第二部材３の方向Ｘ２側の端部に形成された開口３ｃを塞ぐ形でこの端部に配置されている。レンズ３４は、第三光学系３３から入射された光をスクリーンＳＣに投影する。 The lens 34 is arranged at this end so as to close the opening 3c formed at the end of the second member 3 on the direction X2 side. The lens 34 projects the light incident from the third optical system 33 onto the screen SC.
　第四光学系３７は、少なくとも１つのレンズを含み、分岐部材３２の方向Ｘ１側の隣に配置されており、分岐部材３２を透過して方向Ｘ１に進む被写体光を撮像素子３８に導く。第四光学系３７の光軸と、レンズ３４及び第三光学系３３の光軸とは一致している。なお、第四光学系３７は焦点距離が可変のレンズを含んでいてもよい。 The fourth optical system 37 includes at least one lens and is arranged next to the branch member 32 on the direction X1 side, and guides the subject light that passes through the branch member 32 and travels in the direction X1 to the image sensor 38. The optical axis of the fourth optical system 37 coincides with the optical axis of the lens 34 and the third optical system 33. The fourth optical system 37 may include a lens having a variable focal length.
　撮像素子３８は、ＣＣＤ（Ｃｈａｒｇｅ　Ｃｏｕｐｌｅｄ　Ｄｅｖｉｃｅ）イメージセンサ又はＣＭＯＳ（Ｃｏｍｐｌｅｍｅｎｔａｒｙ　Ｍｅｔａｌ　Ｏｘｉｄｅ　Ｓｅｍｉｃｏｎｄｕｃｔｏｒ）イメージセンサ等である。撮像素子３８は、レンズ３４、第三光学系３３、分岐部材３２、及び第四光学系３７を通して、スクリーンＳＣを撮像する。レンズ３４、第三光学系３３、分岐部材３２は、投影光学系の一部を構成している。 The image sensor 38 is a CCD (Charge Coupled Device) image sensor, a CMOS (Complementary Metal Oxide Semiconductor) image sensor, or the like. The image sensor 38 images the screen SC through the lens 34, the third optical system 33, the branch member 32, and the fourth optical system 37. The lens 34, the third optical system 33, and the branch member 32 form a part of the projection optical system.
　回転機構４は、第一部材２に対して第二部材３を回転自在に連結する機構である。この回転機構４によって、第二部材３は、方向Ｙに延びる回転軸（具体的には光軸Ｋ）の回りに回転自在に構成されている。つまり、この回転機構４によって、光学ユニット６内の投影光学系を部分的に回転させることが可能になっている。なお、回転機構４は、投影光学系を回転させることできればよく、図３に示した配置位置に限定されない。また、回転機構の数も１つに限らず、複数設けられていてもよい。 The rotation mechanism 4 is a mechanism for rotatably connecting the second member 3 to the first member 2. By this rotation mechanism 4, the second member 3 is rotatably configured around a rotation axis (specifically, an optical axis K) extending in the direction Y. That is, the rotation mechanism 4 makes it possible to partially rotate the projection optical system in the optical unit 6. The rotation mechanism 4 is not limited to the arrangement position shown in FIG. 3, as long as the projection optical system can be rotated. Further, the number of rotation mechanisms is not limited to one, and a plurality of rotation mechanisms may be provided.
　具体的には、回転機構４により、第二部材３は、図３に示す回転状態（以下、基準回転状態という）と、基準回転状態から紙面手前側に９０度回転された回転状態（以下、左回転状態という）と、基準回転状態から紙面奥側に９０度回転された回転状態（以下、右回転状態という）と、基準回転状態から１８０度回転された回転状態（以下、１８０度回転状態という）と、の４つの回転状態をとることができる。第二部材３が、この４つの回転状態のどの回転状態となっている場合でも、レンズ３４に対向する位置にスクリーンＳＣが設けられて使用される。なお、回転機構４は、手動にて第二部材３を回転させるものの他、電動にて第二部材３を回転させるものであってもよい。本明細書においては、基準回転状態と１８０度回転状態は、それぞれ第一状態を構成する。また、左回転状態は第二状態を構成し、右回転状態は第三状態を構成する。ここでは、４つの回転状態をとれる構成としているが、例えば、第一部材２を本体部１に対して回転可能に構成することで、より多くの回転状態をとれる構成も可能である。 Specifically, the rotation mechanism 4 causes the second member 3 to be rotated by 90 degrees from the reference rotation state (hereinafter referred to as the reference rotation state) and the rotation state (hereinafter, referred to as the reference rotation state) shown in FIG. A left rotation state), a rotation state rotated 90 degrees to the back side of the paper surface from the reference rotation state (hereinafter referred to as a right rotation state), and a rotation state rotated 180 degrees from the reference rotation state (hereinafter referred to as a 180 degree rotation state). It can take four rotation states. Regardless of which of the four rotational states the second member 3 is in, the screen SC is provided at a position facing the lens 34 and is used. The rotation mechanism 4 may be one that manually rotates the second member 3 or one that electrically rotates the second member 3. In the present specification, the reference rotation state and the 180 degree rotation state each constitute the first state. Further, the counterclockwise rotation state constitutes the second state, and the clockwise rotation state constitutes the third state. Here, the configuration is such that four rotational states can be taken, but for example, by configuring the first member 2 to be rotatable with respect to the main body 1, it is possible to have a configuration in which more rotational states can be taken.
　シフト機構５は、投影光学系の光軸Ｋ（換言すると光学ユニット６）をその光軸Ｋに垂直な方向（図３の方向Ｙ）に移動させるための機構である。具体的には、シフト機構５は、第一部材２の本体部１に対する方向Ｙの位置を変更することができるように構成されている。シフト機構５は、手動にて第一部材２を移動させるものの他、電動にて第一部材２を移動させるものであってもよい。 The shift mechanism 5 is a mechanism for moving the optical axis K (in other words, the optical unit 6) of the projection optical system in a direction perpendicular to the optical axis K (direction Y in FIG. 3). Specifically, the shift mechanism 5 is configured so that the position of the first member 2 in the direction Y with respect to the main body 1 can be changed. The shift mechanism 5 may be one that manually moves the first member 2 or one that electrically moves the first member 2.
　図３は、シフト機構５によって第一部材２が方向Ｙ１側に最大限移動された状態を示している。この図３に示す状態から、シフト機構５によって第一部材２が方向Ｙ２に移動することで、光変調素子１２ａによって形成される画像の中心と光軸Ｋとの位置関係が変化して、スクリーンＳＣに投影されている投影画像Ｇ１を方向Ｙ２にシフト（平行移動）させることができる。 FIG. 3 shows a state in which the first member 2 is moved to the direction Y1 side to the maximum by the shift mechanism 5. From the state shown in FIG. 3, the shift mechanism 5 moves the first member 2 in the direction Y2, so that the positional relationship between the center of the image formed by the light modulation element 12a and the optical axis K changes, and the screen The projected image G1 projected on the SC can be shifted (translated) in the direction Y2.
　なお、シフト機構５は、光学ユニット６を方向Ｙに移動させる代わりに、光変調素子１２ａを方向Ｙに移動させる機構であってもよい。この場合でも、スクリーンＳＣに投影されている投影画像Ｇ１を方向Ｙ２にシフトさせることができる。 The shift mechanism 5 may be a mechanism that moves the light modulation element 12a in the direction Y instead of moving the optical unit 6 in the direction Y. Even in this case, the projected image G1 projected on the screen SC can be shifted in the direction Y2.
　図４は、図３に示す基準回転状態における光学ユニット６のレンズ３４をスクリーンＳＣ側から見た模式図である。図４には、光軸Ｋを通り且つ方向Ｙに延びる直線ｌ２と、光軸Ｋを通り且つ方向Ｚに延びる直線ｌ１とが示されている。 FIG. 4 is a schematic view of the lens 34 of the optical unit 6 in the reference rotation state shown in FIG. 3 as viewed from the screen SC side. FIG. 4 shows a straight line l2 that passes through the optical axis K and extends in the direction Y, and a straight line l1 that passes through the optical axis K and extends in the direction Z.
　図４に示すように、レンズ３４は、直線ｌ１と直線ｌ２によって領域３４Ａ、領域３４Ｂ、領域３４Ｃ、及び領域３４Ｄの４つの領域に分割することができる。プロジェクタ１００では、回転機構４による第二部材３の回転状態によって、光変調素子１２ａによって生成された画像を、レンズ３４の異なる領域から射出させてスクリーンＳＣに向けて投影することができるように、投影光学系及び光変調素子１２ａの設計が行われている。 As shown in FIG. 4, the lens 34 can be divided into four regions, region 34A, region 34B, region 34C, and region 34D, by the straight line l1 and the straight line l2. In the projector 100, the images generated by the light modulation elements 12a can be ejected from different regions of the lens 34 and projected toward the screen SC according to the rotational state of the second member 3 by the rotation mechanism 4. The projection optical system and the light modulation element 12a have been designed.
　具体的には、図４に示した領域３４Ａ及び３４ＤからスクリーンＳＣに向けて画像を投影する第一投影モードと、図４に示した領域３４Ａ及び３４ＢからスクリーンＳＣに向けて画像を投影する第二投影モードと、図４に示した領域３４Ｃ及び３４ＤからスクリーンＳＣに向けて画像を投影する第三投影モードと、を切り替え可能となっている。 Specifically, the first projection mode in which the image is projected from the areas 34A and 34D shown in FIG. 4 toward the screen SC, and the first projection mode in which the image is projected from the areas 34A and 34B shown in FIG. 4 toward the screen SC. It is possible to switch between the two projection modes and the third projection mode in which an image is projected from the areas 34C and 34D shown in FIG. 4 toward the screen SC.
　より具体的には、第二部材３の回転状態が基準回転状態と１８０度回転状態である場合、換言すると、光軸Ｋのうちの分岐部材３２とレンズ３４の間の部分が方向Ｘに延びている状態である場合には、第一投影モードにて画像の投影が行われる。 More specifically, when the rotation state of the second member 3 is the reference rotation state and the rotation state of 180 degrees, in other words, the portion of the optical axis K between the branch member 32 and the lens 34 extends in the direction X. In this state, the image is projected in the first projection mode.
　また、第二部材３の回転状態が右回転状態である場合、換言すると、光軸Ｋのうちの分岐部材３２とレンズ３４の間の部分が方向Ｚに延び、且つ、レンズ３４が分岐部材３２よりも方向Ｚ１側に位置する状態である場合には、第二投影モードにて画像の投影が行われる。 When the rotation state of the second member 3 is a clockwise rotation state, in other words, the portion of the optical axis K between the branch member 32 and the lens 34 extends in the direction Z, and the lens 34 is the branch member 32. When the lens is located closer to the direction Z1, the image is projected in the second projection mode.
　また、第二部材３の回転状態が左回転状態である場合、換言すると、光軸Ｋのうちの分岐部材３２とレンズ３４の間の部分が方向Ｚに延び、且つ、レンズ３４が分岐部材３２よりも方向Ｚ２側に位置する状態である場合には、第三投影モードにて画像の投影が行われる。 Further, when the rotation state of the second member 3 is the left rotation state, in other words, the portion of the optical axis K between the branch member 32 and the lens 34 extends in the direction Z, and the lens 34 is the branch member 32. When the lens is located closer to the direction Z2, the image is projected in the third projection mode.
　なお、レンズ３４、第三光学系３３、分岐部材３２、第四光学系３７、及び撮像素子３８は、第二部材３の回転に伴って一体的に回転する。そのため、以下では、スクリーンＳＣ側からレンズ３４を見た状態における、方向Ｙ及び光軸Ｋ（レンズ３４及び第三光学系３３の光軸）に垂直な方向のうち、一方側（左側）を方向Ｚ３と記載し、他方側（右側）を方向Ｚ４と記載して、第二部材３の内部の構成要素の方向を規定する。すなわち、図４の例では、方向Ｚ１を方向Ｚ３として読み替えるものとし、方向Ｚ２を方向Ｚ４として読み替えるものとする。方向Ｚ３と方向Ｚ４を総称して方向ＺＺと記載し、方向ＺＺが第二方向を構成する。 The lens 34, the third optical system 33, the branch member 32, the fourth optical system 37, and the image sensor 38 rotate integrally with the rotation of the second member 3. Therefore, in the following, one side (left side) of the direction Y and the direction perpendicular to the optical axis K (the optical axis of the lens 34 and the third optical system 33) when the lens 34 is viewed from the screen SC side is directed. Z3 is described, and the other side (right side) is described as direction Z4 to define the direction of the internal component of the second member 3. That is, in the example of FIG. 4, the direction Z1 is read as the direction Z3, and the direction Z2 is read as the direction Z4. Direction Z3 and direction Z4 are collectively referred to as direction ZZ, and direction ZZ constitutes the second direction.
　図５は、表示部によって表示される画像とスクリーンに投影される画像との関係を説明するための模式図である。図５には、光変調素子１２ａの表示面１２Ａを開口１５ａ側から方向Ｘ２に見た状態における光変調素子１２ａによって生成される画像ｄ１が最上部に示されている。画像ｄ１は、プロジェクタ１００によってスクリーンＳＣに投影可能な最大サイズの画像を示しており、換言すると、画像を表示可能な画面に相当する。図５では、画像ｄ１の左上隅にＬ字状のマークを付してあるが、このマークは、画像ｄ１の向きを認識しやすくするためのものであり、実際にスクリーンＳＣに投影されるものではない。図５に示す画像ｄ１は、図中右側が方向Ｚ１側であり、図中左側が方向Ｚ２側であり、図中上側が方向Ｙ１側であり、図中下側が方向Ｙ２側である。 FIG. 5 is a schematic diagram for explaining the relationship between the image displayed by the display unit and the image projected on the screen. In FIG. 5, the image d1 generated by the light modulation element 12a in a state where the display surface 12A of the light modulation element 12a is viewed from the opening 15a side in the direction X2 is shown at the uppermost part. The image d1 shows an image of the maximum size that can be projected on the screen SC by the projector 100, in other words, corresponds to a screen on which the image can be displayed. In FIG. 5, an L-shaped mark is attached to the upper left corner of the image d1, and this mark is for facilitating the recognition of the orientation of the image d1 and is actually projected on the screen SC. is not. In the image d1 shown in FIG. 5, the right side in the figure is the direction Z1 side, the left side in the figure is the direction Z2 side, the upper side in the figure is the direction Y1 side, and the lower side in the figure is the direction Y2 side.
　図５には、基準回転状態においてスクリーンＳＣをレンズ３４側と反対側から見た状態におけるスクリーンＳＣ上に投影された画像ｄ１の投影画像Ｇ１と、そのスクリーンＳＣにおける撮像素子３８の撮像範囲ＩＭとが示されている。 FIG. 5 shows a projected image G1 of the image d1 projected on the screen SC when the screen SC is viewed from the side opposite to the lens 34 side in the reference rotation state, and an image pickup range IM of the image sensor 38 in the screen SC. It is shown.
　図５には、左回転状態においてスクリーンＳＣをレンズ３４側と反対側から見た状態におけるスクリーンＳＣ上に投影された画像ｄ１の投影画像Ｇ１と、そのスクリーンＳＣにおける撮像素子３８の撮像範囲ＩＭとが示されている。 FIG. 5 shows a projected image G1 of the image d1 projected on the screen SC when the screen SC is viewed from the side opposite to the lens 34 side in the counterclockwise rotation state, and an image pickup range IM of the image sensor 38 in the screen SC. It is shown.
　図５には、右回転状態においてスクリーンＳＣをレンズ３４側と反対側から見た状態におけるスクリーンＳＣ上に投影された画像ｄ１の投影画像Ｇ１と、そのスクリーンＳＣにおける撮像素子３８の撮像範囲ＩＭとが示されている。 FIG. 5 shows a projected image G1 of the image d1 projected on the screen SC when the screen SC is viewed from the side opposite to the lens 34 side in the clockwise rotation state, and an image pickup range IM of the image sensor 38 in the screen SC. It is shown.
　撮像範囲ＩＭにおいて、左回転状態における投影画像Ｇ１の位置と右回転状態における投影画像Ｇ１の位置とは、光軸Ｋを通り且つ方向Ｙに延びる直線に対して線対称の関係となっている。また、左回転状態における投影画像Ｇ１と右回転状態における投影画像Ｇ１は、光軸Ｋに対して点対称の関係となっている。 In the imaging range IM, the position of the projected image G1 in the left rotation state and the position of the projected image G1 in the right rotation state have a line-symmetrical relationship with respect to a straight line passing through the optical axis K and extending in the direction Y. Further, the projected image G1 in the left rotation state and the projected image G1 in the right rotation state have a point-symmetrical relationship with respect to the optical axis K.
　また、図５には、１８０度回転状態においてスクリーンＳＣをレンズ３４側と反対側から見た状態におけるスクリーンＳＣ上に投影された画像ｄ１の投影画像Ｇ１と、そのスクリーンＳＣにおける撮像素子３８の撮像範囲ＩＭとが示されている。 Further, FIG. 5 shows an image G1 of the image d1 projected on the screen SC when the screen SC is viewed from the side opposite to the lens 34 side in a 180-degree rotation state, and an image sensor 38 on the screen SC. The range IM is shown.
　撮像範囲ＩＭにおいて、１８０度回転状態における投影画像Ｇ１の位置は、基準投影状態における投影画像Ｇ１の位置と一致している。また、１８０度回転状態における投影画像Ｇ１は、基準回転状態における投影画像Ｇ１をそのまま１８０度回転させたものとなっている。 In the imaging range IM, the position of the projected image G1 in the 180-degree rotation state coincides with the position of the projected image G1 in the reference projection state. Further, the projected image G1 in the 180-degree rotation state is a 180-degree rotation of the projected image G1 in the reference rotation state as it is.
　このように、投影画像Ｇ１の位置は、第二部材３の回転状態によって、撮像範囲ＩＭにおいて３つの位置を取り得る。具体的には、基準回転状態及び１８０度回転状態における投影画像Ｇ１の位置は、図５において光軸Ｋよりも上側の位置となっている。また、左回転状態における投影画像Ｇ１の位置は、図５において光軸Ｋよりも左側の位置となっている。また、右回転状態における投影画像Ｇ１の位置は、図５において光軸Ｋよりも右側の位置となっている。基準回転状態及び１８０度回転状態における投影画像Ｇ１の領域は、これを光軸Ｋの周りに図５において９０度左回転させると、左回転状態における投影画像Ｇ１の領域と重なる。基準回転状態及び１８０度回転状態における投影画像Ｇ１の領域は、これを光軸Ｋの周りに図５において９０度右回転させると、右回転状態における投影画像Ｇ１の領域と重なる。 As described above, the positions of the projected image G1 can take three positions in the imaging range IM depending on the rotational state of the second member 3. Specifically, the position of the projected image G1 in the reference rotation state and the 180-degree rotation state is a position above the optical axis K in FIG. Further, the position of the projected image G1 in the left rotation state is a position on the left side of the optical axis K in FIG. Further, the position of the projected image G1 in the clockwise rotation state is the position on the right side of the optical axis K in FIG. The region of the projected image G1 in the reference rotation state and the 180 degree rotation state overlaps with the region of the projection image G1 in the left rotation state when this is rotated 90 degrees counterclockwise in FIG. 5 around the optical axis K. The region of the projected image G1 in the reference rotation state and the 180 degree rotation state overlaps with the region of the projection image G1 in the right rotation state when this is rotated 90 degrees to the right in FIG. 5 around the optical axis K.
　なお、左回転状態において、シフト機構５により光学ユニット６のシフトが行われると、図５の左回転状態にて示した投影画像Ｇ１の領域から、図５の右回転状態にて示した投影画像Ｇ１の領域まで、投影画像Ｇ１が移動することになる。同様に、右回転状態において、シフト機構５により光学ユニット６のシフトが行われると、図５の右回転状態にて示した投影画像Ｇ１の領域から、図５の左回転状態にて示した投影画像Ｇ１の領域まで、投影画像Ｇ１が移動することになる。 When the optical unit 6 is shifted by the shift mechanism 5 in the left rotation state, the projection image shown in the right rotation state of FIG. 5 is transferred from the region of the projection image G1 shown in the left rotation state of FIG. The projected image G1 will move to the region of G1. Similarly, when the optical unit 6 is shifted by the shift mechanism 5 in the clockwise rotation state, the projection shown in the left rotation state of FIG. 5 is projected from the region of the projected image G1 shown in the clockwise rotation state of FIG. The projected image G1 will move to the area of the image G1.
　シフト機構５は、基準回転状態と１８０度回転状態でのみ機能するように構成してもよい。例えば、図３に示す状態をシフト機構５の基準状態とし、左回転状態と右回転状態においては、この基準状態にて画像の投影が行われるものとしてもよい。 The shift mechanism 5 may be configured to function only in the reference rotation state and the 180 degree rotation state. For example, the state shown in FIG. 3 may be set as the reference state of the shift mechanism 5, and the image may be projected in this reference state in the left rotation state and the right rotation state.
　図６は、図５に示した各回転状態において撮像素子３８に結像する画像を示す模式図である。図６には、撮像素子３８の受光面３８ａが示されている。図６は、撮像素子３８を第四光学系３７側から見た状態（正面側から見た状態）を示している。 FIG. 6 is a schematic view showing an image formed on the image sensor 38 in each rotation state shown in FIG. FIG. 6 shows the light receiving surface 38a of the image sensor 38. FIG. 6 shows a state in which the image sensor 38 is viewed from the fourth optical system 37 side (a state viewed from the front side).
　撮像素子３８は、方向ＺＺと、方向ＺＺに交差（本形態では直交）する方向Ｙとに画素が二次元状に配置された受光面３８ａを有する。受光面３８ａは、方向Ｙが短手方向であり、方向ＺＺが長手方向である矩形形状となっている。つまり、受光面３８ａの方向Ｙの長さをＤ１とし、受光面３８ａの方向ＺＺの長さをＤ２とすると、Ｄ２＞Ｄ１の関係となっている。 The image sensor 38 has a light receiving surface 38a in which pixels are arranged two-dimensionally in a direction ZZ and a direction Y intersecting the direction ZZ (orthogonal in this embodiment). The light receiving surface 38a has a rectangular shape in which the direction Y is the lateral direction and the direction ZZ is the longitudinal direction. That is, assuming that the length of the light receiving surface 38a in the direction Y is D1 and the length of the light receiving surface 38a in the direction ZZ is D2, the relationship is D2> D1.
　図６には、レンズ３４、第三光学系３３、分岐部材３２、及び第四光学系３７によって受光面３８ａの方向Ｘの位置と同じ位置に結像される被写体範囲のうちの画質が保証される範囲（歪や収差が十分に少ない範囲）である撮像イメージサークルＰＣが示されている。図６の例では、撮像イメージサークルＰＣの中心が光軸Ｋと一致しており、光軸Ｋと受光面３８ａの中心Ｃ１とが一致している。 In FIG. 6, the image quality of the subject range formed by the lens 34, the third optical system 33, the branch member 32, and the fourth optical system 37 at the same position as the position of the light receiving surface 38a in the direction X is guaranteed. An imaging image circle PC in a range (a range in which distortion and aberration are sufficiently small) is shown. In the example of FIG. 6, the center of the imaging image circle PC coincides with the optical axis K, and the optical axis K coincides with the center C1 of the light receiving surface 38a.
　また、図６には、スクリーンＳＣに投影された投影画像Ｇ１が、レンズ３４、第三光学系３３、分岐部材３２、及び第四光学系３７によって受光面３８ａの位置に結像された状態におけるその結像画像として投影撮像画像ｇ１が示されている。 Further, FIG. 6 shows a state in which the projected image G1 projected on the screen SC is imaged at the position of the light receiving surface 38a by the lens 34, the third optical system 33, the branch member 32, and the fourth optical system 37. The projected image g1 is shown as the image.
　図７は、光変調素子１２ａの表示面を方向Ｘ２に見た模式図である。図７に示す表示面１２Ａの方向Ｘの位置と同じ位置には、投影光学系による光の集光範囲のうち画質が保証される範囲（歪や収差の少ない範囲）である表示イメージサークルＤＣが示されている。図７の例では、表示面１２Ａの中心は、表示イメージサークルＤＣの中心に対し方向Ｙ２側に偏心している。 FIG. 7 is a schematic view of the display surface of the light modulation element 12a viewed in the direction X2. At the same position as the position of the direction X of the display surface 12A shown in FIG. 7, a display image circle DC, which is a range in which image quality is guaranteed (a range with less distortion and aberration) in the light focusing range of the projection optical system It is shown. In the example of FIG. 7, the center of the display surface 12A is eccentric to the direction Y2 with respect to the center of the display image circle DC.
　図８は、基準回転状態又は１８０度回転状態においてシフト機構５により投影画像Ｇ１を移動させた場合の投影撮像画像の移動範囲を模式的に示す図である。図８に示した投影撮像画像ｇ１（ｙ１）は、シフト機構５によって投影画像Ｇ１が方向Ｙ１側に最大限移動された状態（換言すると図３に示した状態）におけるその投影画像Ｇ１の結像画像を示している。図８に示した投影撮像画像ｇ１（ｙ２）は、シフト機構５によって投影画像Ｇ１が方向Ｙ２側に最大限移動された状態におけるその投影画像Ｇ１の結像画像を示している。 FIG. 8 is a diagram schematically showing the moving range of the projected image when the projected image G1 is moved by the shift mechanism 5 in the reference rotation state or the 180 degree rotation state. The projected image g1 (y1) shown in FIG. 8 is an image of the projected image G1 in a state in which the projected image G1 is maximally moved toward the direction Y1 by the shift mechanism 5 (in other words, the state shown in FIG. 3). The image is shown. The projected image g1 (y2) shown in FIG. 8 shows an image of the projected image G1 in a state where the projected image G1 is maximally moved toward the direction Y2 by the shift mechanism 5.
　基準回転状態と１８０度回転状態の各々において、投影撮像画像ｇ１の方向Ｙの幅をＬ１とし、投影撮像画像ｇ１の方向ＺＺの幅をＬ２とすると、Ｌ１＜Ｌ２となっている。 When the width of the direction Y of the projected image g1 is L1 and the width of the direction ZZ of the projected image g1 is L2 in each of the reference rotation state and the 180 degree rotation state, L1 <L2.
　また、基準回転状態と１８０度回転状態の各々において、投影撮像画像ｇ１（ｙ１）の方向Ｙの中心位置（第一位置）と投影撮像画像ｇ１（ｙ２）の方向Ｙの中心位置（第二位置）との距離をＳ１とし、投影撮像画像ｇ１（ｙ１）の方向Ｙの中心位置及び投影撮像画像ｇ１（ｙ２）の方向Ｙの中心位置の中間位置（図８中の点Ｃ２の位置）と受光面３８ａの方向Ｙの中心位置（第三位置）との距離をＭとし、方向ＺＺにおける投影撮像画像ｇ１（ｙ１），ｇ１（ｙ２）の中心位置と受光面３８ａの中心位置との距離をＢ２とする。また、左回転状態における投影撮像画像ｇ１の方向ＺＺの中心位置と、右回転状態における投影撮像画像ｇ１の方向ＺＺの中心位置との距離をＳ２とする。 Further, in each of the reference rotation state and the 180 degree rotation state, the center position (first position) in the direction Y of the projected image g1 (y1) and the center position (second position) in the direction Y of the projected image g1 (y2). ) Is S1, and the intermediate position between the center position of the projected image g1 (y1) in the direction Y and the center position of the projected image g1 (y2) in the direction Y (the position of the point C2 in FIG. The distance of the surface 38a from the center position (third position) of the direction Y is M, and the distance between the center positions of the projected images g1 (y1) and g1 (y2) in the direction ZZ and the center position of the light receiving surface 38a is B2. And. Further, the distance between the center position of the direction ZZ of the projected image g1 in the counterclockwise rotation state and the center position of the direction ZZ of the projected image g1 in the clockwise rotation state is defined as S2.
　そして、本形態では、基準回転状態と１８０度回転状態の各々において、以下の関係式（Ａ）、（Ｂ）、（Ｃ）が成り立ち、左回転状態及び右回転状態の各々において以下の関係式（Ｄ）、（Ｅ）の関係が成り立つように、光変調素子１２ａ、シフト機構５、投影光学系、第四光学系３７、及び撮像素子３８の特性、配置、構造、サイズ等が決められている。 Then, in this embodiment, the following relational expressions (A), (B), and (C) are established in each of the reference rotation state and the 180 degree rotation state, and the following relational expressions are established in each of the left rotation state and the right rotation state. The characteristics, arrangement, structure, size, etc. of the light modulation element 12a, the shift mechanism 5, the projection optical system, the fourth optical system 37, and the image pickup element 38 are determined so that the relationships (D) and (E) are established. There is.
（Ａ）Ｌ２≦Ｄ２
（Ｂ）０＜Ｍ≦｛Ｄ１－（Ｓ１＋Ｌ１）｝×０．５
（Ｃ）Ｂ２＝０
（Ｄ）Ｌ２≦Ｄ１、且つ、Ｓ１＋Ｌ１＜Ｄ１
（Ｅ）Ｓ２＋Ｌ１≦Ｄ２ (A) L2 ≤ D2
(B) 0 <M ≦ {D1- (S1 + L1)} × 0.5
(C) B2 = 0
(D) L2 ≦ D1 and S1 + L1 <D1
(E) S2 + L1 ≦ D2
　これら（Ａ）から（Ｅ）の関係式が成り立つことにより、どの回転状態かつシフト状態においても、投影撮像画像ｇ１を漏れなく受光面３８ａに結像させることができる。 By establishing the relational expressions (A) to (E), the projected image g1 can be formed on the light receiving surface 38a without omission in any rotational state and shift state.
　（Ｄ）と（Ｅ）の関係式は、左回転状態と右回転状態のいずれにおいても、投影撮像画像ｇ１を受光面３８ａ内に結像させるためのものとなる。 The relational expression between (D) and (E) is for forming the projected image g1 in the light receiving surface 38a in both the left rotation state and the right rotation state.
　なお、（Ｂ）の関係式において、Ｍを０よりも大きい値としているのは、分岐部材３２を画像が透過する際に生じるその画像の方向Ｙの位置ずれがあるからである。スクリーンＳＣ側からレンズ３４に入射する画像は、分岐部材３２を透過する際に、分岐部材３２の厚みに起因して、方向Ｙに僅かに位置がずれる。 In the relational expression (B), M is set to a value larger than 0 because there is a positional shift in the direction Y of the image that occurs when the image passes through the branch member 32. The image incident on the lens 34 from the screen SC side is slightly displaced in the direction Y due to the thickness of the branch member 32 when passing through the branch member 32.
　プロジェクタ１００では、図８に示した投影撮像画像ｇ１（ｙ１）に対応するスクリーンＳＣ上の投影画像Ｇ１の中心と、図８に示した投影撮像画像ｇ１（ｙ２）に対応するスクリーンＳＣ上の投影画像Ｇ１の中心との中間位置に光軸Ｋが交わるように表示部、シフト機構５、及び投影光学系が設計されている。このようにすることで、投影撮像画像ｇ１（ｙ１）に対応する投影画像Ｇ１と投影撮像画像ｇ１（ｙ２）に対応する投影画像Ｇ１の品質を均一化することができる。また、シフト機構５の設計を容易にすることができる。 In the projector 100, the center of the projected image G1 on the screen SC corresponding to the projected image g1 (y1) shown in FIG. 8 and the projection on the screen SC corresponding to the projected image g1 (y2) shown in FIG. 8 The display unit, the shift mechanism 5, and the projection optical system are designed so that the optical axis K intersects the center of the image G1. By doing so, the quality of the projected image G1 corresponding to the projected image g1 (y1) and the quality of the projected image G1 corresponding to the projected image g1 (y2) can be made uniform. Moreover, the design of the shift mechanism 5 can be facilitated.
　図８に示した投影撮像画像ｇ１（ｙ１）に対応するスクリーンＳＣ上の投影画像Ｇ１の中心と、図８に示した投影撮像画像ｇ１（ｙ２）に対応するスクリーンＳＣ上の投影画像Ｇ１の中心との中間位置に光軸Ｋが交わる構成では、投影画像が分岐部材３２を透過する際に方向Ｙ１側にシフトする。この結果、図８に示すように、点Ｃ２の位置が受光面３８ａの中心Ｃ１よりも方向Ｙ１側にずれた状態になる。この状態であっても、（Ａ）、（Ｂ）、（Ｃ）の関係を満たせば、投影画像Ｇ１を撮像することができる。 The center of the projected image G1 on the screen SC corresponding to the projected image g1 (y1) shown in FIG. 8 and the center of the projected image G1 on the screen SC corresponding to the projected image g1 (y2) shown in FIG. In the configuration in which the optical axis K intersects the intermediate position with, the projected image shifts to the direction Y1 side when passing through the branch member 32. As a result, as shown in FIG. 8, the position of the point C2 is shifted to the direction Y1 side from the center C1 of the light receiving surface 38a. Even in this state, the projected image G1 can be captured if the relationships (A), (B), and (C) are satisfied.
　このように、本形態では、上記のＭの最小値は、分岐部材３２の厚みに起因して生じる画像のずれ量に相当する値（０よりも大きい値）となる。Ｍの最小値が０よりも大きいのを許容することで、シフト機構５や投影光学系の設計を容易として製造コストを下げることができる。 As described above, in the present embodiment, the minimum value of M is a value (a value larger than 0) corresponding to the amount of image deviation caused by the thickness of the branch member 32. By allowing the minimum value of M to be larger than 0, the design of the shift mechanism 5 and the projection optical system can be facilitated, and the manufacturing cost can be reduced.
　以上のように、プロジェクタ１００によれば、上記（Ａ）、（Ｂ）、（Ｃ）の関係式が成り立つように光学ユニット６と表示部が構成されている。このため、シフト機構５や投影光学系の設計を容易として製造コストを下げることができる。また、光軸Ｋと受光面３８ａの中心とを一致させることもでき、製造上のメリット（既存の位置合わせ技術などを援用できること等）や画像処理上のメリット（光学特性に応じた撮像画像の補正処理等が容易となること等）を享受しつつ、投影撮像画像ｇ１を漏れなく受光面３８ａに結像させることができる。 As described above, according to the projector 100, the optical unit 6 and the display unit are configured so that the relational expressions (A), (B), and (C) above are satisfied. Therefore, the design of the shift mechanism 5 and the projection optical system can be facilitated, and the manufacturing cost can be reduced. In addition, the optical axis K and the center of the light receiving surface 38a can be aligned with each other, which has advantages in manufacturing (existing alignment technology can be used, etc.) and in image processing (images captured according to optical characteristics). It is possible to form an image of the projected image g1 on the light receiving surface 38a without omission while enjoying (such as facilitating the correction process).
　また、プロジェクタ１００によれば、更に、上記（Ｄ）、（Ｅ）の関係式が成り立つように光学ユニット６が構成されている。このため、投影画像Ｇ１を回転させた状態であっても、投影撮像画像ｇ１を漏れなく受光面３８ａに結像させることができる。 Further, according to the projector 100, the optical unit 6 is further configured so that the relational expressions (D) and (E) above are satisfied. Therefore, even when the projected image G1 is rotated, the projected image g1 can be imaged on the light receiving surface 38a without omission.
　また、プロジェクタ１００によれば、更に、上記（Ｃ）の関係式が成り立つように光学ユニット６が構成されている。関係式（Ｃ）は、基準回転状態と１８０度回転状態における投影撮像画像ｇ１の方向ＺＺの位置を規定するものである。Ｂ２＝０、すなわち、基準回転状態と１８０度回転状態における方向ＺＺの投影撮像画像ｇ１の中心位置と受光面３８ａの中心位置とを一致させることで、撮像イメージサークルＰＣの中心に近い位置にて投影撮像画像ｇ１を結像させることができる。このため、撮像画像の品質を向上させることができる。分岐部材３２における画像の位置ずれは１つの方向（本形態では方向Ｙ）にしか生じない。そのため、Ｂ２＝０とする設計は容易に行うことができる。 Further, according to the projector 100, the optical unit 6 is further configured so that the relational expression (C) above holds. The relational expression (C) defines the position of the direction ZZ of the projected image g1 in the reference rotation state and the 180 degree rotation state. By matching the center position of the projected image g1 in the direction ZZ in the reference rotation state and the 180 degree rotation state with the center position of the light receiving surface 38a, B2 = 0, that is, at a position close to the center of the image pickup image circle PC. The projected image g1 can be imaged. Therefore, the quality of the captured image can be improved. The misalignment of the image in the branch member 32 occurs in only one direction (direction Y in this embodiment). Therefore, the design in which B2 = 0 can be easily performed.
　なお、投影撮像画像ｇ１の１画素のサイズは、受光面３８ａの１画素のサイズ以上となっていることが好ましい。このようにすることで、投影撮像画像ｇ１の１画素を、撮像素子３８の１画素以上の画素にて撮像することができ、高解像度での撮像が可能となる。 It is preferable that the size of one pixel of the projected image g1 is equal to or larger than the size of one pixel of the light receiving surface 38a. By doing so, one pixel of the projected image g1 can be imaged by one or more pixels of the image sensor 38, and high-resolution imaging becomes possible.
　投影撮像画像ｇ１の１画素のサイズを、受光面３８ａの１画素のサイズ以上とするためには、撮像イメージサークルＰＣの半径をＲ３とし、表示イメージサークルＤＣの半径をＲ１とし、受光面３８ａの画素のサイズをＰ３とし、表示面１２Ａの表示画素のサイズをＰ１とした場合に、（Ｐ１／Ｐ３）×（Ｒ３／Ｒ１）≧１の関係が成り立つようにすればよい。 In order to make the size of one pixel of the projected image g1 larger than the size of one pixel of the light receiving surface 38a, the radius of the imaged image circle PC is set to R3, the radius of the display image circle DC is set to R1, and the size of the light receiving surface 38a is set to R1. When the pixel size is P3 and the display pixel size of the display surface 12A is P1, the relationship of (P1 / P3) × (R3 / R1) ≧ 1 may be established.
　プロジェクタ１００は、回転機構４によって投影光学系の一部を回転させることができるが、回転機構４は必須ではない。例えば、プロジェクタ１００から回転機構４を削除して、上述してきた基準回転状態でのみ画像の投影が可能な構成としてもよい。この場合には、上記（Ａ）、（Ｂ）、（Ｃ）の関係式が成り立つようにプロジェクタ１００を設計すればよい。 The projector 100 can rotate a part of the projection optical system by the rotation mechanism 4, but the rotation mechanism 4 is not essential. For example, the rotation mechanism 4 may be deleted from the projector 100 so that the image can be projected only in the reference rotation state described above. In this case, the projector 100 may be designed so that the relational expressions (A), (B), and (C) above are satisfied.
　図８にて説明した“Ｍ”は、投影撮像画像ｇ１（ｙ１）の方向Ｙの中心と投影撮像画像ｇ１（ｙ２）の方向Ｙの中心との中間位置と、受光面３８ａの方向Ｙの中心位置との距離としたが、これに限らない。 “M” described in FIG. 8 is an intermediate position between the center of the direction Y of the projected image g1 (y1) and the center of the direction Y of the projected image g1 (y2), and the center of the direction Y of the light receiving surface 38a. The distance to the position is used, but it is not limited to this.
　基準回転状態と１８０度回転状態において、方向Ｙにおける投影撮像画像ｇ１（ｙ１）の方向Ｙ１の端の位置から任意の位置（第一位置）までの距離と、投影撮像画像ｇ１（ｙ１）の方向Ｙ２の端の位置からこの第一位置までの距離との比を第１比とし、方向Ｙにおける投影撮像画像ｇ１（ｙ２）の方向Ｙ１の端の位置から任意の位置（第二位置）までの距離と、投影撮像画像ｇ１（ｙ２）の方向Ｙ２の端の位置からこの第二位置までの距離との比を第２比とする。また、方向Ｙにおける受光面３８ａの方向Ｙ１の端の位置から任意の位置（第三位置）までの距離と、受光面３８ａの方向Ｙ２の端の位置からこの第三位置までの距離との比を第３比とする。この場合に、第一位置と第二位置と第三位置を、第１比と第２比と第３比が同じになる位置とし、上記“Ｍ”を第一位置及び第二位置の中間位置と第三位置との距離に置き換えてもよい。第１比と第２比と第３比がそれぞれ１：１となる構成が、図８に示す構成である。 The distance from the end position of the direction Y1 of the projected image g1 (y1) in the direction Y to an arbitrary position (first position) in the reference rotation state and the 180 degree rotation state, and the direction of the projected image g1 (y1). The ratio of the distance from the end position of Y2 to the first position is defined as the first ratio, and the projection image g1 (y2) in the direction Y from the end position of the direction Y1 to an arbitrary position (second position). The ratio of the distance to the distance from the position of the end of the direction Y2 of the projected image g1 (y2) to this second position is defined as the second ratio. Further, the ratio of the distance from the position of the end of the direction Y1 of the light receiving surface 38a in the direction Y to an arbitrary position (third position) and the distance from the position of the end of the direction Y2 of the light receiving surface 38a to this third position. Is the third ratio. In this case, the first position, the second position, and the third position are the positions where the first ratio, the second ratio, and the third ratio are the same, and the above "M" is the intermediate position between the first position and the second position. May be replaced with the distance between and the third position. The configuration in which the first ratio, the second ratio, and the third ratio are 1: 1 respectively is the configuration shown in FIG.
　また、図６にて説明した“Ｓ２”は、左回転状態の投影撮像画像ｇ１の方向ＺＺの中心位置と、右回転状態の投影撮像画像ｇ１の方向ＺＺの中心位置との距離としたが、これに限らない。 Further, “S2” described with reference to FIG. 6 is the distance between the center position of the direction ZZ of the projected image g1 in the counterclockwise rotation state and the center position of the direction ZZ of the projected image g1 in the clockwise rotation state. Not limited to this.
　左回転状態において、方向ＺＺにおける投影撮像画像ｇ１の方向Ｚ３の端の位置から任意の位置（第四位置）までの距離と、投影撮像画像ｇ１の方向Ｚ４の端の位置からこの第四位置までの距離との比を第４比とする。また、右回転状態において、方向ＺＺにおける投影撮像画像ｇ１の方向Ｚ３の端の位置から任意の位置（第五位置）までの距離と、投影撮像画像ｇ１の方向Ｚ４の端の位置からこの第五位置までの距離との比を第５比とする。この場合に、第四位置と第五位置を、第４比と第５比が同じになる位置とし、上記“Ｓ２”を第四位置と第五位置との距離に置き換えてもよい。第４比と第５比がそれぞれ１：１となる構成が、図６に示す構成である。 In the counterclockwise rotation state, the distance from the end position of the direction Z3 of the projected image g1 in the direction ZZ to an arbitrary position (fourth position) and the position of the end of the direction Z4 of the projected image g1 to the fourth position. Let the ratio with the distance be the fourth ratio. Further, in the clockwise rotation state, the fifth position is obtained from the distance from the end position of the direction Z3 of the projected image g1 in the direction ZZ to an arbitrary position (fifth position) and the position of the end of the direction Z4 of the projected image g1. The ratio to the distance to the position is defined as the fifth ratio. In this case, the fourth position and the fifth position may be the positions where the fourth ratio and the fifth ratio are the same, and the above "S2" may be replaced with the distance between the fourth position and the fifth position. The configuration in which the fourth ratio and the fifth ratio are 1: 1 respectively is the configuration shown in FIG.
　また、以上の説明では、図５に示すように、回転機構４によって、基準回転状態における投影画像Ｇ１を図中の右回りに９０度回転したり、基準回転状態における投影画像Ｇ１を図中の左回りに９０度回転したりできるものとした。この投影画像Ｇ１を回転可能に構成する際の投影画像Ｇ１の回転角度は９０度には限定されず、任意の回転角度を採用することができる。 Further, in the above description, as shown in FIG. 5, the projection image G1 in the reference rotation state is rotated 90 degrees clockwise in the figure by the rotation mechanism 4, and the projection image G1 in the reference rotation state is in the figure. It is assumed that it can be rotated 90 degrees counterclockwise. The rotation angle of the projected image G1 when the projected image G1 is configured to be rotatable is not limited to 90 degrees, and any rotation angle can be adopted.
　プロジェクタ１００の光学ユニット６は、分岐部材３２を単にミラーとし、レンズ３４の前方に、レンズ３４から射出された光を反射させてスクリーンＳＣに投影し且つスクリーンＳＣからの被写体光を透過させる光学部材（分岐部材３２と同様の部材）を配置し、この光学部材を透過した光の光路上に第四光学系３７及び撮像素子３８を配置した構成であってもよい。 The optical unit 6 of the projector 100 simply uses the branch member 32 as a mirror, and reflects the light emitted from the lens 34 in front of the lens 34 and projects it onto the screen SC, and transmits the subject light from the screen SC. (A member similar to the branch member 32) may be arranged, and the fourth optical system 37 and the image pickup element 38 may be arranged on the optical path of the light transmitted through the optical member.
　以上説明したように、本明細書には以下の事項が開示されている。 As explained above, the following matters are disclosed in this specification.
（１）
　表示部からの画像を投影対象物に投影する光学系と、
　上記光学系の一部を通して上記投影対象物を撮像する撮像素子と、
　上記投影対象物に投影される上記画像を平行移動させるシフト機構と、を備え、
　上記撮像素子は、複数の画素が第一方向と上記第一方向に交差する第二方向とに二次元状に配置された受光面を有し、
　上記投影対象物に投影された上記画像が上記光学系の上記一部によって上記受光面の位置に結像された状態におけるその画像を投影撮像画像とし、上記シフト機構によって上記投影撮像画像が上記第一方向の一方側に最大限移動された状態におけるその投影撮像画像の上記第一方向の位置を第一位置とし、上記シフト機構によって上記投影撮像画像が上記第一方向の他方側に最大限移動された状態におけるその投影撮像画像の上記第一方向において上記第一位置と同じ位置関係にある位置を第二位置とし、上記受光面の上記第一方向において上記第一位置と同じ位置関係にある位置を第三位置とし、上記第一位置と上記第二位置との中間位置と、上記第三位置との距離をＭとし、上記投影撮像画像の上記第一方向の幅をＬ１とし、上記第一位置と上記第二位置の距離をＳ１とし、上記受光面の上記第一方向の幅をＤ１とした場合に、
　０＜Ｍ≦｛Ｄ１－（Ｓ１＋Ｌ１）｝×０．５の関係が成り立つ投影装置。 (1)
An optical system that projects an image from the display onto an object to be projected,
An image sensor that images the projection object through a part of the optical system,
A shift mechanism for translating the image projected on the projection object is provided.
The image pickup device has a light receiving surface in which a plurality of pixels are two-dimensionally arranged in a first direction and a second direction in which the first direction intersects.
The image in a state where the image projected on the projection object is formed at the position of the light receiving surface by the part of the optical system is used as a projection image, and the projection image is obtained by the shift mechanism. The position in the first direction of the projected image in the state of being moved to one side in one direction is set as the first position, and the projected image is moved to the other side in the first direction by the shift mechanism. The position having the same positional relationship as the first position in the first direction of the projected image in the projected state is defined as the second position, and the position has the same positional relationship as the first position in the first direction of the light receiving surface. The position is the third position, the distance between the intermediate position between the first position and the second position and the third position is M, the width of the projected image in the first direction is L1, and the first position. When the distance between the first position and the second position is S1 and the width of the light receiving surface in the first direction is D1.
A projection device having a relationship of 0 <M ≦ {D1- (S1 + L1)} × 0.5.
（２）
　（１）記載の投影装置であって、
　上記第一位置は、上記投影撮像画像の上記第一方向の中心位置であり、
　上記第二位置は、上記投影撮像画像の上記第一方向の中心位置であり、
　上記第三位置は、上記受光面の上記第一方向の中心位置である投影装置。 (2)
(1) The projection device according to the above.
The first position is the center position of the projected image in the first direction.
The second position is the center position of the projected image in the first direction.
The third position is a projection device which is the center position of the light receiving surface in the first direction.
（３）
　（１）又は（２）記載の投影装置であって、
　上記投影撮像画像の１画素のサイズは、上記受光面の上記画素のサイズ以上となっている投影装置。 (3)
The projection device according to (1) or (2).
A projection device in which the size of one pixel of the projected image is larger than the size of the pixel on the light receiving surface.
（４）
　（３）記載の投影装置であって、
　上記光学系の上記一部によって上記受光面の位置に結像される被写体範囲のうちの撮像イメージサークルの半径をＲ３とし、上記表示部の位置における上記光学系の光の集光範囲のうちの表示イメージサークルの半径をＲ１とし、上記受光面の上記画素のサイズをＰ３とし、上記表示部の表示画素のサイズをＰ１とした場合に、
　（Ｐ１／Ｐ３）×（Ｒ３／Ｒ１）≧１の関係が成り立つ投影装置。 (4)
(3) The projection device according to the above.
The radius of the imaging image circle in the subject range imaged at the position of the light receiving surface by the part of the optical system is R3, and the light condensing range of the optical system at the position of the display unit. When the radius of the display image circle is R1, the size of the pixel on the light receiving surface is P3, and the size of the display pixel of the display unit is P1.
A projection device in which the relationship of (P1 / P3) × (R3 / R1) ≧ 1 holds.
（５）
　（１）から（４）のいずれか記載の投影装置であって、
　上記光学系を回転させる回転機構を備え、
　上記回転機構は、上記投影撮像画像の一辺が上記第一方向と平行になる第一状態と、上記投影撮像画像が上記第一状態に対して一方の回転方向に回転された状態となる第二状態と、上記投影撮像画像が上記第一状態に対して他方の回転方向に回転された状態となる第三状態と、の間にて上記画像を回転させるものであり、
　上記第一状態において０＜Ｍ≦｛Ｄ１－（Ｓ１＋Ｌ１）｝×０．５の上記関係が成り立ち、
　上記第二状態及び上記第三状態の各々において、上記投影撮像画像が上記受光面内に結像する投影装置。 (5)
The projection device according to any one of (1) to (4).
Equipped with a rotation mechanism that rotates the above optical system
The rotation mechanism has a first state in which one side of the projected image is parallel to the first direction, and a second state in which the projected image is rotated in one rotation direction with respect to the first state. The image is rotated between the state and the third state in which the projected image is rotated in the other rotation direction with respect to the first state.
In the first state, the above relationship of 0 <M ≦ {D1- (S1 + L1)} × 0.5 holds.
A projection device in which the projected image is formed in the light receiving surface in each of the second state and the third state.
（６）
　（５）記載の投影装置であって、
　上記第二状態における上記投影撮像画像の上記第二方向の第四位置と、上記第三状態における上記投影撮像画像の上記第二方向における上記第四位置と同じ位置関係にある第五位置との距離をＳ２とし、上記第一状態における上記投影撮像画像の上記第一方向の幅をＬ１とし、上記第二方向の上記受光面の幅をＤ２とした場合に、
　Ｓ２＋Ｌ１≦Ｄ２の関係が成り立つ投影装置。 (6)
(5) The projection device according to the above.
The fourth position of the projected image taken in the second state in the second direction and the fifth position having the same positional relationship as the fourth position of the projected image in the second direction in the third state. When the distance is S2, the width of the projected image in the first state in the first direction is L1, and the width of the light receiving surface in the second direction is D2.
A projection device in which the relationship of S2 + L1 ≦ D2 holds.
（７）
　（６）記載の投影装置であって、
　上記第四位置は、上記投影撮像画像の上記第二方向の中心位置であり、
　上記第五位置は、上記投影撮像画像の上記第二方向の中心位置である投影装置。 (7)
(6) The projection device according to the above.
The fourth position is the center position of the projected image in the second direction.
The fifth position is a projection device which is the center position of the projected image in the second direction.
（８）
　（１）から（７）のいずれか記載の投影装置であって、
　上記光学系の上記一部は、上記表示部からの画像を反射させて上記投影対象物に導き、且つ、上記投影対象物からの光を透過して上記撮像素子に導く光学部材を含む投影装置。 (8)
The projection device according to any one of (1) to (7).
The part of the optical system is a projection device including an optical member that reflects an image from the display unit and guides the image to the projection object, and transmits light from the projection object to guide the image sensor. ..
（９）
　（８）記載の投影装置であって、
　上記光学部材は、ハーフミラー又は偏光板である投影装置。 (9)
(8) The projection device according to the above.
The optical member is a projection device that is a half mirror or a polarizing plate.
　以上、図面を参照しながら各種の実施の形態について説明したが、本発明はかかる例に限定されないことは言うまでもない。当業者であれば、特許請求の範囲に記載された範疇内において、各種の変更例又は修正例に想到し得ることは明らかであり、それらについても当然に本発明の技術的範囲に属するものと了解される。また、発明の趣旨を逸脱しない範囲において、上記実施の形態における各構成要素を任意に組み合わせてもよい。 Although various embodiments have been described above with reference to the drawings, it goes without saying that the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the claims, which naturally belong to the technical scope of the present invention. Understood. Further, each component in the above embodiment may be arbitrarily combined as long as the gist of the invention is not deviated.
　なお、本出願は、２０１９年６月２８日出願の日本特許出願（特願２０１９－１２１５３８）に基づくものであり、その内容は本出願の中に参照として援用される。 Note that this application is based on the Japanese patent application (Japanese Patent Application No. 2019-121538) filed on June 28, 2019, the contents of which are incorporated herein by reference.
１００　プロジェクタ
１　本体部
２　第一部材
２ａ、２ｂ　開口
２Ａ　中空部
２１　第一光学系
２２　反射部材
３　第二部材
３ａ、３ｃ　開口
３Ａ　中空部
３１　第二光学系
３２　分岐部材
３３　第三光学系
３４　レンズ
３４Ａ、３４Ｂ、３４Ｃ、３４Ｄ　領域
ｌ１、ｌ２　直線
３７　第四光学系
３８　撮像素子
３８ａ　受光面
４　回転機構
５　シフト機構
６　光学ユニット
１１　光源ユニット
４１　光源
４２　カラーホイール
４３　照明光学系
１２　光変調ユニット
１２ａ　光変調素子
１２Ａ　表示面
１５　筐体
１５ａ　開口
Ｋ　光軸
Ｃ１　中心
Ｃ２　点
ＳＣ　スクリーン
ｄ１　画像
Ｇ１　投影画像ｇ１、ｇ１（ｙ１）、ｇ１（ｙ２）　投影撮像画像
ＩＭ　撮像範囲
ＰＣ　撮像イメージサークル
ＤＣ　表示イメージサークル
  100 Projector 1 Main body 2 First member 2a, 2b Aperture 2A Hollow part 21 First optical system 22 Reflective member 3 Second member 3a, 3c Aperture 3A Hollow part 31 Second optical system 32 Branch member 33 Third optical system 34 Lens 34A, 34B, 34C, 34D Region l1, l2 Straight line 37 Fourth optical system 38 Imaging element 38a Light receiving surface 4 Rotating mechanism 5 Shift mechanism 6 Optical unit 11 Light source unit 41 Light source 42 Color wheel 43 Illumination optical system 12 Light modulation unit 12a Light Modulator 12A Display surface 15 Housing 15a Aperture K Optical axis C1 Center C2 Point SC screen d1 Image G1 Projection image g1, g1 (y1), g1 (y2) Projection image pickup image IM Imaging range PC Imaging image circle DC Display image circle

Claims (9)

  1. 　表示部からの画像を投影対象物に投影する光学系と、
    　前記光学系の一部を通して前記投影対象物を撮像する撮像素子と、
    　前記投影対象物に投影される前記画像を平行移動させるシフト機構と、を備え、
    　前記撮像素子は、複数の画素が第一方向と前記第一方向に交差する第二方向とに二次元状に配置された受光面を有し、
    　前記投影対象物に投影された前記画像が前記光学系の前記一部によって前記受光面の位置に結像された状態における当該画像を投影撮像画像とし、前記シフト機構によって前記投影撮像画像が前記第一方向の一方側に最大限移動された状態における当該投影撮像画像の前記第一方向の位置を第一位置とし、前記シフト機構によって前記投影撮像画像が前記第一方向の他方側に最大限移動された状態における当該投影撮像画像の前記第一方向において前記第一位置と同じ位置関係にある位置を第二位置とし、前記受光面の前記第一方向において前記第一位置と同じ位置関係にある位置を第三位置とし、前記第一位置と前記第二位置との中間位置と、前記第三位置との距離をＭとし、前記投影撮像画像の前記第一方向の幅をＬ１とし、前記第一位置と前記第二位置の距離をＳ１とし、前記受光面の前記第一方向の幅をＤ１とした場合に、
    　０＜Ｍ≦｛Ｄ１－（Ｓ１＋Ｌ１）｝×０．５の関係が成り立つ投影装置。     An optical system that projects an image from the display onto an object to be projected,
    An image sensor that images the projection object through a part of the optical system,
    A shift mechanism for translating the image projected on the projection object is provided.
    The image pickup device has a light receiving surface in which a plurality of pixels are two-dimensionally arranged in a first direction and a second direction in which the first direction intersects.
    The image in a state where the image projected on the projection object is imaged at the position of the light receiving surface by the part of the optical system is used as a projection image, and the projection image is obtained by the shift mechanism. The position of the first direction of the projected image in the state of being moved to one side in one direction as the first position is set as the first position, and the projected image is moved to the other side of the first direction as much as possible by the shift mechanism. The position having the same positional relationship as the first position in the first direction of the projected image in the projected state is defined as the second position, and the position has the same positional relationship as the first position in the first direction of the light receiving surface. The position is the third position, the distance between the intermediate position between the first position and the second position and the third position is M, the width of the projected image in the first direction is L1, and the first position. When the distance between the first position and the second position is S1 and the width of the light receiving surface in the first direction is D1.
    A projection device having a relationship of 0 <M ≦ {D1- (S1 + L1)} × 0.5.
  2. 　請求項１記載の投影装置であって、
    　前記第一位置は、前記投影撮像画像の前記第一方向の中心位置であり、
    　前記第二位置は、前記投影撮像画像の前記第一方向の中心位置であり、
    　前記第三位置は、前記受光面の前記第一方向の中心位置である投影装置。     The projection device according to claim 1.
    The first position is the center position in the first direction of the projected image.
    The second position is the center position in the first direction of the projected image.
    The third position is a projection device which is a central position of the light receiving surface in the first direction.
  3. 　請求項１又は２記載の投影装置であって、
    　前記投影撮像画像の１画素のサイズは、前記受光面の前記画素のサイズ以上となっている投影装置。     The projection device according to claim 1 or 2.
    A projection device in which the size of one pixel of the projected image is equal to or larger than the size of the pixel on the light receiving surface.
  4. 　請求項３記載の投影装置であって、
    　前記光学系の前記一部によって前記受光面の位置に結像される被写体範囲のうちの撮像イメージサークルの半径をＲ３とし、前記表示部の位置における前記光学系の光の集光範囲のうちの表示イメージサークルの半径をＲ１とし、前記受光面の前記画素のサイズをＰ３とし、前記表示部の表示画素のサイズをＰ１とした場合に、
    　（Ｐ１／Ｐ３）×（Ｒ３／Ｒ１）≧１の関係が成り立つ投影装置。     The projection device according to claim 3.
    The radius of the imaging image circle in the subject range imaged at the position of the light receiving surface by the part of the optical system is R3, and the light condensing range of the optical system at the position of the display unit. When the radius of the display image circle is R1, the size of the pixel on the light receiving surface is P3, and the size of the display pixel of the display unit is P1.
    A projection device in which the relationship of (P1 / P3) × (R3 / R1) ≧ 1 holds.
  5. 　請求項１から４のいずれか１項記載の投影装置であって、
    　前記光学系を回転させる回転機構を備え、
    　前記回転機構は、前記投影撮像画像の一辺が前記第一方向と平行になる第一状態と、前記投影撮像画像が前記第一状態に対して一方の回転方向に回転された状態となる第二状態と、前記投影撮像画像が前記第一状態に対して他方の回転方向に回転された状態となる第三状態と、の間にて前記画像を回転させるものであり、
    　前記第一状態において０＜Ｍ≦｛Ｄ１－（Ｓ１＋Ｌ１）｝×０．５の前記関係が成り立ち、
    　前記第二状態及び前記第三状態の各々において、前記投影撮像画像が前記受光面内に結像する投影装置。     The projection device according to any one of claims 1 to 4.
    A rotation mechanism for rotating the optical system is provided.
    The rotation mechanism is a first state in which one side of the projected image is parallel to the first direction, and a second state in which the projected image is rotated in one rotation direction with respect to the first state. The image is rotated between a state and a third state in which the projected image is rotated in the other rotation direction with respect to the first state.
    In the first state, the above relationship of 0 <M ≦ {D1- (S1 + L1)} × 0.5 holds.
    A projection device in which the projected image is formed in the light receiving surface in each of the second state and the third state.
  6. 　請求項５記載の投影装置であって、
    　前記第二状態における前記投影撮像画像の前記第二方向の第四位置と、前記第三状態における前記投影撮像画像の前記第二方向における前記第四位置と同じ位置関係にある第五位置との距離をＳ２とし、前記第一状態における前記投影撮像画像の前記第一方向の幅をＬ１とし、前記第二方向の前記受光面の幅をＤ２とした場合に、
    　Ｓ２＋Ｌ１≦Ｄ２の関係が成り立つ投影装置。     The projection device according to claim 5.
    A fourth position in the second direction of the projected image in the second state and a fifth position having the same positional relationship as the fourth position in the second direction of the projected image in the third state. When the distance is S2, the width of the projected image in the first state in the first direction is L1, and the width of the light receiving surface in the second direction is D2.
    A projection device in which the relationship of S2 + L1 ≦ D2 holds.
  7. 　請求項６記載の投影装置であって、
    　前記第四位置は、前記投影撮像画像の前記第二方向の中心位置であり、
    　前記第五位置は、前記投影撮像画像の前記第二方向の中心位置である投影装置。     The projection device according to claim 6.
    The fourth position is the center position of the projected image in the second direction.
    The fifth position is a projection device which is a center position of the projected image in the second direction.
  8. 　請求項１から７のいずれか１項記載の投影装置であって、
    　前記光学系の前記一部は、前記表示部からの画像を反射させて前記投影対象物に導き、且つ、前記投影対象物からの光を透過して前記撮像素子に導く光学部材を含む投影装置。     The projection device according to any one of claims 1 to 7.
    The part of the optical system is a projection device including an optical member that reflects an image from the display unit and guides the image to the projection object, and transmits light from the projection object to guide the image sensor. ..
  9. 　請求項８記載の投影装置であって、
    　前記光学部材は、ハーフミラー又は偏光板である投影装置。
          The projection device according to claim 8.
    The optical member is a projection device that is a half mirror or a polarizing plate.
PCT/JP2020/020907 2019-06-28 2020-05-27 Projection device WO2020261850A1 (en)

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Citations (5)

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JP2006313979A (en) * 2005-05-06 2006-11-16 Seiko Epson Corp Projector, and method for controlling projector
JP2012068363A (en) * 2010-09-22 2012-04-05 Konica Minolta Opto Inc Projection device
US20120280941A1 (en) * 2009-12-28 2012-11-08 Wuhan Splendid Optronics Technology Co., Ltd Projection display system for table computers
JP2016057426A (en) * 2014-09-09 2016-04-21 ソニー株式会社 Projection type display device and function control method
JP2017111303A (en) * 2015-12-16 2017-06-22 コニカミノルタ株式会社 Image projection device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006313979A (en) * 2005-05-06 2006-11-16 Seiko Epson Corp Projector, and method for controlling projector
US20120280941A1 (en) * 2009-12-28 2012-11-08 Wuhan Splendid Optronics Technology Co., Ltd Projection display system for table computers
JP2012068363A (en) * 2010-09-22 2012-04-05 Konica Minolta Opto Inc Projection device
JP2016057426A (en) * 2014-09-09 2016-04-21 ソニー株式会社 Projection type display device and function control method
JP2017111303A (en) * 2015-12-16 2017-06-22 コニカミノルタ株式会社 Image projection device

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