Projection-type image display apparatus

Abstract

To mount an imaging device on a projection-type image display apparatus so that the position and attitude of the imaging device can be adjusted.SOLUTION: A projection-type image display apparatus 10 comprises: an imaging device 30 for imaging a projection image appearing on a projection target; a bracket 36 positioned with respect to a housing of the apparatus 10; and first to fourth screw 44 to 50 for positioning the imaging device 30 with respect to the bracket 36. The bracket 36 includes, when viewed in an extending direction of an imaging optical axis LA1 of the imaging device 30, first and second slotted through holes 36c and 36d that penetrate in different directions and extend in a circumferential direction of the imaging optical axis LA1, and first and second tapped holes 36e and 36f. The imaging device 30 includes third and fourth tapped holes 32e and 32f engaging with the first and second screws 44 and 46 passing through the first and second through holes 36c and 36d, and first and second contact portions 32g and 32h in contact with the third and fourth screws 48 and 50 passing through the first and second tapped holes 36e and 36f.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present disclosure relates to a projection-type image display device. [Background technology]

[0002] For example, a projection-type image display device projects a projection image onto a projection target such as a screen or a building. To confirm the positional relationship between the projection target and the projection image, the projection image reflected on the projection target may be captured by an imaging device. In this case, the projection position of the projection image is adjusted based on the projection image reflected in the captured image. For this purpose, a projection-type image display device equipped with an imaging device is known (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-175895 Summary of the Invention [Problem to be solved by the invention]

[0004] In the case of a projection-type image display device equipped with an imaging device, the imaging device must be provided in the projection-type image display device so that the projected image is not distorted or tilted and the entire image is captured in the captured image. To achieve this, the imaging device must be provided in the projection-type image display device with high positioning accuracy, which is extremely difficult in terms of manufacturing.

[0005] Therefore, the objective of the present disclosure is to provide a projection-type image display device equipped with an imaging device that captures a projected image reflected on a projection target, and to mount the imaging device on the projection-type image display device so that the position and attitude of the imaging device can be adjusted. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, according to one aspect of the present disclosure, A housing; A projection optical system; an imaging device that captures a projection image projected by the projection optical system and reflected on a projection target; a bracket positioned relative to the housing; first to fourth screws for positioning the imaging device relative to the bracket, the bracket has first and second through holes each having a long hole shape that penetrates toward the imaging device in different directions when viewed in the extension direction of an imaging optical axis of the imaging device and extends in a circumferential direction of the imaging optical axis; a first female screw hole and a second female screw hole that penetrate the imaging device when viewed in the direction in which the imaging optical axis extends; the imaging device has third and fourth female screw holes that engage with the first and second screws that pass through the first and second through holes of the bracket, respectively; and first and second contact portions that come into contact with third and fourth screws that pass through the first and second female screw holes of the bracket, respectively. [Effects of the Invention]

[0007] According to the present disclosure, in a projection-type image display device equipped with an imaging device that captures a projection image reflected on a projection target, the imaging device can be mounted on the projection-type image display device so that adjustment of the position and attitude of the imaging device can be performed. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a block diagram illustrating a configuration of a projection-type image display device according to an embodiment of the present disclosure. [Figure 2] FIG. 10 is a diagram showing an example of a captured image in which the projected image is distorted, tilted, and partially missing. [Figure 3] FIG. 1 is a conceptual diagram illustrating adjustment of the position and attitude of an imaging device; [Figure 4] Perspective view of an imaging device [Figure 5] Top view of the imaging device [Figure 6] Cross-sectional view of an imaging device [Figure 7] FIG. 1 is a perspective view showing the attachment of the lens barrel to the bracket. [Figure 8] Top view of the lens barrel attached to the bracket [Figure 9] Exploded perspective view of an imaging device DETAILED DESCRIPTION OF THE INVENTION

[0009] A projection-type image display device according to one embodiment of the present disclosure comprises a housing, a projection optical system, an imaging device that captures a projection image projected by the projection optical system and reflected on a projection target, a bracket positioned relative to the housing, and first to fourth screws for positioning the imaging device relative to the bracket, wherein the bracket has first and second elongated through holes that penetrate toward the imaging device in different directions when viewed in the extension direction of the imaging optical axis of the imaging device and extend circumferentially of the imaging optical axis, and first and second female screw holes that penetrate toward the imaging device when viewed in the extension direction of the imaging optical axis, and the imaging device has third and fourth female screw holes that engage with the first and second screws that pass through the first and second through holes of the bracket, respectively, and first and second contact portions that contact the third and fourth screws that pass through the first and second female screw holes of the bracket, respectively.

[0010] According to this aspect, in a projection-type image display device equipped with an imaging device that captures a projected image reflected on a projection target, the imaging device can be mounted on the projection-type image display device so that adjustment of the position and attitude of the imaging device can be performed.

[0011] For example, the projection-type image display device may further include an elastic member that is disposed between the bracket and the imaging device in an elastically deformed state.

[0012] For example, the projection-type image display device may further include an image forming device that forms the projected image, an optical element that is arranged between the projection optical system and the image forming device and forms a projection optical path along which the projected image propagates from the image forming device to the projection optical system, and an imaging optical path along which the projected image propagates from the projection target to the imaging device via the projection optical system.

[0013] For example, the imaging device may include a lens barrel having the imaging optical axis and an imaging element provided in the lens barrel. The lens barrel may also include the third and fourth female screw holes and the first and second contact portions.

[0014] For example, the housing may have a mounting surface parallel to the projection optical axis of the projection optical system, the lens barrel may have a reference surface perpendicular to the imaging optical axis, and the bracket may be fixed to the housing so that the mounting surface and the reference surface remain in contact.

[0015] For example, the imaging element may be provided on the lens barrel so that its tilt with respect to the imaging optical axis is adjustable.

[0016] For example, the imaging element may be provided on the lens barrel so that its position relative to the lens barrel in the direction in which the imaging optical axis extends is adjustable.

[0017] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters or redundant descriptions of substantially identical configurations may be omitted. This is to avoid unnecessary redundancy in the following description and to facilitate understanding by those skilled in the art.

[0018] The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0019] Hereinafter, a projection-type image display device according to an embodiment of the present disclosure will be described with reference to the drawings.

[0020] FIG. 1 is a block diagram showing a configuration of a projection-type image display device according to an embodiment of the present disclosure.

[0021] 1, a projection-type image display device 10 according to this embodiment has a housing 12. Housing 12 is equipped with a projection optical system 14 made up of multiple lenses that projects a projection image onto a projection target such as a screen S, an image forming device 16 that forms the projection image projected by projection optical system 14, and an imaging device 30 that captures the projection image projected by projection optical system 14 and reflected on screen S. In this embodiment, image forming device 16 includes a light source 18 and a light modulation element 20 that modulates light from light source 18 to form an image (image light).

[0022] In the present embodiment, an optical member 22 is provided between the projection optical system 14 and the image forming device 16 (its light modulation element 20). The optical member 22 forms a projection path P1 along which the projected image propagates from the image forming device 16 to the screen S via the projection optical system 14, and an imaging path P2 along which the projected image propagates from the screen S to the imaging device 30 via the projection optical system 14. The optical member 22 is, for example, a prism, a half mirror, or the like.

[0023] According to this embodiment, the projection image output from the image forming device 16 is projected onto the screen S via the optical member 22 and the projection optical system 14. The projection image on the screen S is captured by the imaging device 30 via the projection optical system 14 and the optical member 22.

[0024] The image capturing device 30 is positioned relative to the housing 12 so that the captured image properly reflects the projected image.

[0025] FIG. 2 is a diagram showing an example of a captured image in which the projected image is distorted, tilted, and partially missing.

[0026] 2, if the position and orientation of the imaging device 30 relative to the projection optical system 14 are not appropriate, the projected image Ip may appear in the captured image Ic in at least one of the following states: trapezoidal deformation, tilted state, or partial loss. The projection-type image display device 10 of this embodiment is configured so that the imaging device 30 is mounted on the housing 12, allowing adjustment of the position and orientation of the imaging device 30 so that the entire projected image Ip is displayed in the captured image Ic without deformation or tilt.

[0027] FIG. 3 is a conceptual diagram for explaining adjustment of the position and attitude of the imaging device.

[0028] As shown in Fig. 3, the specific method will be described later, but first, the position of the imaging device 30 is adjusted so that the imaging optical axis LA1 of the imaging device 30 intersects with the projection optical axis LA2 of the projection optical system 14 at a predetermined angle α. Note that the imaging optical axis LA1 is the optical axis of a lens barrel included in the imaging device 30, and details will be described later. In addition, the predetermined angle α is 90 degrees in the present embodiment. However, the predetermined angle α is not limited to 90 degrees.

[0029] Fig. 4 is a perspective view of the imaging device, Fig. 5 is a top view of the imaging device, and Fig. 6 is a cross-sectional view of the imaging device.

[0030] 4 to 6, imaging device 30 includes a lens barrel 32 having an imaging optical axis LA1, and an imaging element 34 provided in lens barrel 32. Note that imaging element 34 is not visible in FIGS. 4 and 5.

[0031] In this specification, the embodiments of the present disclosure are described using an XYZ Cartesian coordinate system. This XYZ-axis Cartesian coordinate system is defined relative to the lens barrel 32 of the imaging device 30. The Z axis coincides with the imaging optical axis LA1 of the lens barrel 32.

[0032] 6, lens barrel 32 includes therein a plurality of lenses 36A-36G through which a projected image propagated from screen S via projection optical system 14 passes. Specifically, lens barrel 32 holds these lenses so that the optical axes of lenses 36A-36G are aligned in the same line, i.e., positioned on imaging optical axis LA1 of lens barrel 32. Note that the plurality of lenses 36A-36G may include a zoom lens that shifts in the direction in which imaging optical axis LA1 extends (Z-axis direction).

[0033] The image sensor 34 has a light-receiving surface 34a that receives the projected image that has passed through the lens barrel 32. The image sensor 34 creates image data, i.e., captured image data that shows the projected image, based on the projected image received by the light-receiving surface 34a. The captured image data is displayed, for example, on a display provided on the housing 12 of the projection-type image display device 10, or on the display of a PC or mobile terminal that is capable of wireless or wired communication with the projection-type image display device 10. As will be described later, the user adjusts the position and attitude of the image sensor 30 based on the captured image Ic displayed on the display.

[0034] 5, in the present embodiment, light receiving surface 34a of image sensor 34 is rectangular and has a longitudinal direction and a lateral direction. Furthermore, in the present embodiment, as will be described in detail later, image sensor 34 is positioned relative to lens barrel 32 in two mutually different directions (X-axis direction and Y-axis direction) that are orthogonal to the direction in which image capturing optical axis LA1 extends (Z-axis direction). In other words, image sensor 34 is provided in lens barrel 32 so that image capturing optical axis LA1 passes through center C1 of light receiving surface 34a when viewed in the direction in which image capturing optical axis LA1 extends (Z-axis direction).

[0035] 3, image sensor 34 (light receiving surface 34a thereof) is positioned relative to lens barrel 32 at a rotational angle position θz about imaging optical axis LA1. That is, image sensor 34 is provided in lens barrel 32 so that the longitudinal direction of light receiving surface 34a is parallel to the X-axis (the lateral direction is parallel to the Y-axis) when viewed in the direction in which imaging optical axis LA1 extends.

[0036] 6, in this embodiment, lens barrel 32 is cylindrical and includes large diameter portion 32a and small diameter portion 32b. Large diameter portion 32a is provided with flange portion 32c. Flange portion 32c includes reference surface 32d. Reference surface 32d is a plane that intersects with imaging optical axis LA1 at a predetermined angle α.

[0037] 6, the housing 12 of the projection-type image display device 10 has a mounting surface 12a that comes into surface contact with a reference surface 32d of the lens barrel 32 of the imaging device 30. The mounting surface 12a is a plane that is parallel to the projection optical axis LA2 of the projection optical system 14 and is spaced a predetermined distance D from the projection optical axis LA2. Therefore, while the reference surface 32d and the mounting surface 12a remain in contact with each other, the angle formed between the imaging optical axis LA1 of the lens barrel 32 of the imaging device 30 and the projection optical axis LA2 of the projection optical system 14 is maintained at a predetermined angle α.

[0038] In this embodiment, the contact between reference surface 32d of lens barrel 32 and mounting surface 12a of housing 12 is maintained by bracket .

[0039] Fig. 7 is a perspective view showing the attachment of the lens barrel to the bracket, and Fig. 8 is a top view of the lens barrel attached to the bracket.

[0040] As shown in FIG. 7 , in this embodiment, the bracket 36 is an arc-shaped member. As shown in FIGS. 6 and 7 , the bracket 36 has an inner surface 36a facing the large-diameter portion 32a of the lens barrel 32 and a seating surface 36b that seats on the mounting surface 12a of the housing 12. The bracket 36 also has a plurality of positioning pins 38. A plurality of positioning holes 12b that engage with the positioning pins 38 are formed in the mounting surface 12a of the housing 12. As shown in FIGS. 7 and 8 , the bracket 36 is fixed to the housing 12 via a plurality of screws 40 and 42. As a result, the bracket 36 is positioned and fixed relative to the housing 12. The projection optical system 14, for example, a lens barrel that holds a plurality of lenses that constitute the projection optical system 14, is positioned and fixed relative to the housing 12. As a result, the bracket 36 is positioned relative to the projection optical system 14 via the housing 12.

[0041] 6, in this embodiment, flange portion 32c of lens barrel 32 is sandwiched between bracket 36 and mounting surface 12a of housing 12 in the extension direction (Z-axis direction) of imaging optical axis LA1 of lens barrel 32. This fixes lens barrel 32 at a predetermined position in the extension direction (Z-axis direction) of imaging optical axis LA1 relative to projection optical axis LA2.

[0042] 3, simply bringing reference surface 32d of lens barrel 32 into contact with mounting surface 12a of housing 12 does not allow imaging optical axis LA1 of lens barrel 32 to intersect with projection optical axis LA2 of projection optical system 14. In order to make imaging optical axis LA1 and projection optical axis LA2 intersect, lens barrel 32, with reference surface 32d in contact with mounting surface 12a, needs to be adjusted in two mutually different directions (X-axis direction and Z-axis direction) that are perpendicular to the direction in which imaging optical axis LA1 extends (Z-axis direction). Bracket 36 is configured to enable this adjustment to make imaging optical axis LA1 and projection optical axis LA2 intersect.

[0043] 7 and 8, projection-type image display device 10 has a plurality of screws 44, 46, 48, and 50 (first to fourth screws). Bracket 36 first cooperates with screws 44 and 46 to adjust the position of lens barrel 32 in two mutually different directions (X-axis direction and Y-axis direction) that are perpendicular to the direction in which imaging optical axis LA1 extends (Z-axis direction).

[0044] 7 and 8, bracket 36 has through holes 36c and 36d (first and second through holes) that penetrate toward lens barrel 32 in different directions when viewed in the direction in which imaging optical axis LA1 of lens barrel 32 extends (Z-axis direction). In the present embodiment, through holes 36c and 36d penetrate bracket 36 in directions that are 90 degrees apart from each other. Furthermore, through holes 36c and 36d are elongated holes that extend in the circumferential direction of imaging optical axis LA1, for reasons that will be described later. The width size (size in the Z-axis direction) of elongated through holes 36c and 36d is smaller than the diameters of heads 44a and 46a of screws 44 and 46.

[0045] A screw 44 passes through through-hole 36c from the outside to the inside of bracket 36 and engages with an internally threaded hole 32e (third internally threaded hole) formed in large-diameter portion 32a of lens barrel 32 that faces inner surface 36a of bracket 36. A screw 46 also passes through through-hole 36d from the outside to the inside of bracket 36 and engages with an internally threaded hole 32f (fourth internally threaded hole) of lens barrel 32. In other words, internally threaded holes 32e and 32f are formed in lens barrel 32 so as to extend in directions that are 90 degrees apart from each other.

[0046] By adjusting the amount of insertion of screw 44 into female threaded hole 32e and the amount of insertion of screw 46 into female threaded hole 32f, the position of lens barrel 32 is adjusted in two mutually different directions (X-axis direction and Z-axis direction) that are perpendicular to the direction in which imaging optical axis LA1 extends (Z-axis direction). Specifically, the greater the amount of insertion, the smaller the distance between heads 44a, 46a of screws 44, 46 and lens barrel 32, and as a result, bracket 36 and lens barrel 32 get closer together.

[0047] In the present embodiment, as shown in FIG. 8 , an elastic member 52 is disposed between the bracket 36 and the lens barrel 32. In the present embodiment, the elastic member 52 is a leaf spring. The elastic member 52 is in contact with the bracket 36 and the lens barrel 32 and is elastically deformed. Specifically, both ends are in contact with the bracket 36, and the central portion is in contact with the lens barrel 32 in a curved state. Without this elastic member 52, the lens barrel 32 would be able to move freely relative to the bracket 36. In order to fix the position of the lens barrel 32 relative to the bracket 36, the elastic member 52 biases the lens barrel 32 so as to move away from the bracket 36 in a direction perpendicular to the extension direction of the imaging optical axis LA1 (the Z-axis direction).

[0048] As described above, by adjusting the amount of insertion of screws 44, 46 into female threaded holes 32e, 32f, the position of lens barrel 32 can be adjusted in two mutually different directions (X-axis direction and Y-axis direction) that are perpendicular to the direction in which imaging optical axis LA1 extends (Z-axis direction). In other words, lens barrel 32 can be positioned and fixed so that imaging optical axis LA1 and projection optical axis LA2 intersect with each other. As a result, light from center C2 of projection range Ap of projection optical system 14 shown in FIG. 3 propagates to center C1 of light receiving surface 34a of imaging element 34, and thereby appears at the center of captured image Ic.

[0049] 7, through holes 52a, 52b through which the screws 44, 46 pass are formed in the elastic member 52. The screws 44, 46 pass through the through holes 52a, 52b, thereby maintaining the elastic member 52 between the bracket 36 and the lens barrel 32. The elastic member 52 is not limited to a leaf spring, and may be, for example, a coil spring through which the screws 44, 46 pass.

[0050] Even if the imaging optical axis LA1 and the projection optical axis L2 intersect, the projected image Ip in the captured image Ic may be tilted. That is, even if the center C2 of the projection range Ap of the projection optical system 14 is located at the center of the captured image Ic, the projected image Ip in the captured image Ic may be rotated. To adjust this tilt, as shown in FIG. 3, it is necessary to make the longitudinal direction of the projection range Ap of the projection optical system 14 parallel to the longitudinal direction of the light receiving surface 34a of the image sensor 34. That is, it is necessary to adjust the rotational angle position θz of the lens barrel 32 centered on the imaging optical axis LA1. The bracket 36 is configured so that the rotational angle position θz of the lens barrel 32 can be adjusted.

[0051] 7 and 8, bracket 36 cooperates with screws 48, 50 to adjust lens barrel 32 with respect to rotational angular position θz of lens barrel 32. To that end, bracket 36 has female threaded holes 32e, 32f (first and second female threaded holes) that each penetrate toward lens barrel 32 when viewed in the direction in which imaging optical axis LA1 of lens barrel 32 extends (Z-axis direction). In the case of this embodiment, female threaded holes 32e, 32f penetrate bracket 36 in the same direction when viewed in the direction in which imaging optical axis LA1 of lens barrel 32 extends.

[0052] Screw 48 passes through female thread hole 36e from the outside to the inside of bracket 36, and its tip contacts planar contact portion 32g (first contact portion) formed on flange portion 32c of lens barrel 32. Screw 50 passes through female thread hole 36f from the outside to the inside of bracket 36, and its tip contacts planar contact portion 32h (second contact portion) of lens barrel 32.

[0053] The rotational angular position θz of lens barrel 32 about imaging optical axis LA1 is adjusted by adjusting the amount by which screws 48, 50 each protrude from inner surface 36a of bracket 36. For example, if the amount by which screw 48 protrudes is increased while the amount by which screw 50 protrudes is decreased, lens barrel 32 shown in Figure 8 will rotate clockwise about imaging optical axis LA1. Conversely, if the amount by which screw 48 protrudes is decreased while the amount by which screw 50 protrudes is increased, lens barrel 32 will rotate counterclockwise.

[0054] In order to prevent lens barrel 32 from freely rotating about imaging optical axis LA1, screw 48 needs to remain in contact with contact portion 32g, and screw 50 needs to remain in contact with contact portion 32h. Also, to enable lens barrel 32, which is positioned relative to bracket 36 by screws 44, 46, to rotate about imaging optical axis LA1, through-holes 36c, 36d, through which shafts 44b, 46b of screws 44, 46 pass, are formed as elongated holes extending in the circumferential direction of imaging optical axis LA1.

[0055] As described above, by adjusting the amount by which the screws 48, 50 protrude from the inner surface 36a of the bracket 36, it is possible to adjust the lens barrel 32 for the rotational angle position θz about the imaging optical axis LA1. That is, as shown in Fig. 3, it is possible to make the longitudinal direction of the projection range Ap of the projection optical system 14 parallel to the longitudinal direction of the light receiving surface 34a of the imaging element 34. As a result, the projected image Ip can be projected onto the captured image Ic without tilting.

[0056] In the present embodiment, the lens barrel 32, whose position in two mutually different directions (X-axis direction and Y-axis direction) orthogonal to the direction in which the imaging optical axis LA1 extends (Z-axis direction) and whose rotational angle position θz around the imaging optical axis LA1 has been adjusted, is fixed to the housing 12 together with the bracket 36 by screws 42. Specifically, as shown in FIGS. 7 and 8 , the screws 42 pass through through holes 36g and 36h formed in the bracket 36 and through holes 32i and 32j formed in the flange portion 32c of the lens barrel 32, and engage with female threaded holes (not shown) formed in the housing 12. The position of the lens barrel 32 is adjusted with the screws 42 loosened. The through holes 32i and 32j are larger than the through holes 32i and 32j so that the position of the lens barrel 32 can be adjusted even when the screws 42 are passing through the through holes 32i and 32j.

[0057] 5, in this embodiment, imaging element 34 is positioned relative to lens barrel 32 in two mutually different directions (X-axis direction and Y-axis direction) that are orthogonal to the extension direction (Z-axis direction) of imaging optical axis LA1, as will be described in detail later. Also, imaging element 34 is positioned relative to lens barrel 32 with respect to a rotational angular position θz about imaging optical axis LA1.

[0058] On the other hand, the imaging element 34 is mounted on the lens barrel 32 so that its position in the extension direction (Z-axis direction) of the imaging optical axis LA1 relative to the lens barrel 32 and its inclination relative to the imaging optical axis LA1 (rotational angle positions θx, θy shown in Figure 3) can be adjusted.

[0059] FIG. 9 is an exploded perspective view of the imaging device.

[0060] As shown in Fig. 6, in this embodiment, the imaging element 34 is mounted on a circuit board 60. As shown in Fig. 9, the circuit board 60 is fixed to a heat sink 62 that absorbs heat generated from the imaging element 34 and the circuit board 60 and releases it to the outside.

[0061] The heat sink 62 is tiltably supported by a bottomed, cylindrical sliding sleeve 64 that fits into the small-diameter portion 32b of the lens barrel 32. Specifically, the sliding sleeve 64 has two stepped pins 64b, 64c protruding from a bottom surface 64a thereof. The heat sink 62 has through-holes 62a, 62b into which the tips of the stepped pins 64b, 64c enter. Small gaps exist between the inner circumferential surfaces of the through-holes 62a, 62b and the tips of the stepped pins 60b, 64c, and the heat sink 62 is tiltably supported by the stepped pins 64b, 64c through these gaps. A glass plate 66 is attached to the bottom surface 64a of the sliding sleeve 64, through which a projected image from the lens barrel 32 toward the light-receiving surface 34a of the image sensor 34 passes.

[0062] Three screws 68 and three coil springs 70 are used to fix the position of the heat sink 62 relative to the sliding sleeve 64. Specifically, the heat sink 62 has through holes 62c through which the screws 68 pass. The bottom surface 64a of the sliding sleeve 64 has internally threaded holes 64d that engage with the screws 68. As shown in FIG. 6, the coil springs 70 are disposed in a compressed state between the heat sink 62 and the bottom surface 64a of the sliding sleeve 64, and are passed through by the screws 68.

[0063] By adjusting the amount of penetration of each of the three screws 68 into the female threaded holes 64d, the attitude of the heat sink 62 relative to the slide sleeve 64, i.e., the attitude of the imaging element 34 of the circuit board 60 supported by the heat sink 62, can be adjusted.

[0064] The sliding sleeve 64 is fitted into the small diameter portion 32b of the lens barrel 32. That is, the inner peripheral surface of the bottomed, cylindrical sliding sleeve 64 is slidably supported on the outer peripheral surface of the cylindrical small diameter portion 32b. As a result, the sliding sleeve 64 is allowed to move only in the direction in which the imaging optical axis LA1 of the lens barrel 32 extends (the Z-axis direction). Furthermore, by fitting the sliding sleeve 64 into the small diameter portion 32b of the lens barrel 32, the center C1 of the light receiving surface 34a of the imaging element 34 on the circuit board 60, which is supported by the heat sink 62 provided on the sliding sleeve 64, is positioned on the imaging optical axis LA1 of the lens barrel 32.

[0065] 6, the slide sleeve 64 is fitted into the small diameter portion 32b of the lens barrel 32 with its rotation about the imaging optical axis LA1 restricted. To this end, the lens barrel 32 is provided with a pin-shaped stopper portion 32k. As shown in FIGS. 6 and 8, the pin-shaped stopper portion 32k is provided on the shoulder portion 32m between the large diameter portion 32a and the small diameter portion 32b of the lens barrel 32. As shown in FIG. 6, a recess 64e that engages with the stopper portion 32k is formed in the slide sleeve 64.

[0066] By engaging the stopper portion 32k with the recess 54e, the rotation of the sliding sleeve 64 about the imaging optical axis LA1 is restricted, i.e., the sliding sleeve 64 is positioned with respect to the lens barrel 32 with respect to the rotational angle position θz about the imaging optical axis LA1. As a result, the imaging element 34 on the circuit board 60 supported by the heat sink 62 provided on the sliding sleeve 64 is positioned with respect to the rotational angle position θz about the imaging optical axis LA1. In other words, the imaging element 34 is positioned with respect to the lens barrel 32 so that the longitudinal direction of the light receiving surface 34a is parallel to the X-axis (the short-side direction is parallel to the Y-axis) when viewed in the direction in which the imaging optical axis LA1 extends (the Z-axis direction).

[0067] By being mounted on the slide sleeve 64 thus positioned relative to the lens barrel 32, the tilt of the image sensor 34 relative to the imaging optical axis LA1 (rotational angle positions θx, θy shown in FIG. 3) can be adjusted. That is, by adjusting the amount of insertion of each of the three screws 68 into the female screw holes 64d, the tilt of the image sensor 34 relative to the imaging optical axis LA1 can be adjusted via the heat sink 62.

[0068] Furthermore, the sliding sleeve 64 is provided on the lens barrel 32 so that its position can be adjusted in the direction in which the imaging optical axis LA1 of the lens barrel 32 extends (the Z-axis direction). To this end, as shown in FIGS. 6 and 9 , the sliding sleeve 64 has a flange portion 64f. A wave washer 72 is disposed between the sliding sleeve 64 and the shoulder portion 32m of the lens barrel 32. An adjustment ring 74 is also provided to adjust the position of the sliding sleeve 64. The adjustment ring 74 is cylindrical and accommodates the flange portion 64f of the sliding sleeve 64, and has an annular stopper portion 74a that faces the flange portion 64f in the direction in which the imaging optical axis LA1 extends. An internal thread is formed on the inner circumferential surface of the adjustment ring 74, and an external thread that engages with the internal thread is formed on the large diameter portion 32a near the small diameter portion 32b of the lens barrel 32.

[0069] As shown in FIG. 6, the flange portion 64f of the sliding sleeve 64 is clamped between the stopper portion 74a of the adjustment ring 74 and the wave washer 72 in the direction in which the imaging optical axis LA1 extends (the Z-axis direction). As a result, the flange portion 64f remains in contact with the stopper portion 74a of the adjustment ring 74, and the position of the sliding sleeve 64 in the direction in which the imaging optical axis LA1 extends is fixed. Furthermore, by rotating the adjustment ring 74, the distance between the stopper portion 74a of the sliding sleeve 64 and the shoulder portion 32m of the lens barrel 32 changes, thereby changing the position of the sliding sleeve 64 in the direction in which the imaging optical axis LA1 extends. As a result, the position of the imaging element 34 on the circuit board 60, which is supported by the sliding sleeve 64 via the heat sink 62, in the direction in which the imaging optical axis LA1 extends can be adjusted.

[0070] So far, we have explained the configuration of the projection-type image display device 10 required to adjust the position and attitude of the imaging device 30 so that the entire projected image Ip appears in the captured image Ic without deformation or tilt. From here on, we will explain the operations that the user must perform on the projection-type image display device 10 so that the entire projected image Ip appears in the captured image Ic without deformation or tilt.

[0071] First, assemble the projection-type image display device 10. However, loosen the screws 42 shown in Figures 7 and 8 in order to adjust the position of the lens barrel 32. Also, display the image Ip captured by the image sensor 34 on a display or the like.

[0072] First, the user operates the adjustment ring 74 while viewing the captured image Ic on the display, and adjusts the focus of the projected image Ip on the captured image Ic.

[0073] Once the projected image Ip on the captured image Ic is in focus, the user adjusts the position of the imaging device 30 in two mutually different directions (X-axis direction and Y-axis direction) that are perpendicular to the direction in which the imaging optical axis LA1 extends (Z-axis direction) by turning screws 44 and 46 shown in Figures 7 and 8. This causes the imaging optical axis LA1 of the lens barrel 32 to intersect with the projection optical axis LA2 of the projection optical system 14. This operation is completed when the center of the captured image Ip is reflected in the center of the captured image Ic.

[0074] 7 and 8, the user adjusts the rotation angle position θz of the imaging device 30 around the imaging optical axis LA1. This operation is completed when the projected image Ip is reflected in the captured image Ic without tilt.

[0075] Next, the user adjusts the inclination of the image sensor 34 with respect to the imaging optical axis LA1 (the rotation angle positions θx, θy shown in FIG. 3) by turning the multiple screws 68 shown in FIG. 6 and FIG. 9. This operation is completed when the captured image Ic is reflected in the projected image Ip without any distortion.

[0076] Finally, the user refocuses the projected image Ip on the captured image Ic by operating the adjustment ring 74. After that, adhesive is poured into the gaps between the screws 68 and the through-holes 62c of the heat sink 62 and into the gaps between the tips of the stepped pins 64b and 64c and the through-holes 62a and 62b.

[0077] As a result of the above operations, the projected image Ip can be captured in its entirety in the captured image Ic without being distorted or tilted.

[0078] According to the present embodiment described above, in a projection-type image display device equipped with an imaging device that captures a projection image reflected on a projection target, the imaging device can be mounted on the projection-type image display device so that adjustment of the position and attitude of the imaging device can be performed.

[0079] Although the present disclosure has been described above with reference to the above-mentioned embodiments, the present disclosure is not limited to these embodiments.

[0080] For example, in the above-described embodiment, as shown in Fig. 8, elastic member 52 biases lens barrel 32 so that lens barrel 32 moves away from bracket 36. However, embodiments of the present disclosure are not limited to this. For example, lens barrel 32 may be provided in housing 12 so that imaging optical axis LA1 extends horizontally, and bracket 36 may be disposed above lens barrel 32. In this case, lens barrel 32 moves away from bracket 36 due to its own weight, making elastic member 52 unnecessary.

[0081] Furthermore, in the above-described embodiment, the image sensor 34 is provided in the lens barrel 32 so that its position in the direction in which the image sensor LA1 extends (the Z-axis direction) and its inclination with respect to the image sensor LA1 (rotational angle positions θx, θy) are adjustable. However, the embodiments of the present disclosure are not limited to this. For example, the image sensor 34 may be fixed directly to the lens barrel 32 while its position with respect to the lens barrel 32 in the direction in which the image sensor LA1 extends and its inclination with respect to the image sensor LA1 are fixed.

[0082] Furthermore, in the above-described embodiment, as shown in FIG. 1 , the imaging device 30 captures the projection image Ip on the screen S via the projection optical system 14. However, the embodiment of the present disclosure is not limited to this. For example, if the positional relationship between the projection target, such as the screen S, and the projection-type image display device 10 is constant (e.g., in a movie theater), the imaging device 30 may capture the projection image Ip on the screen S directly, without using the projection optical system 14.

[0083] Furthermore, in the above-described embodiment, the housing 12 and the bracket 36 are separate members, but this embodiment is not limited to this. The bracket 36 may be a part of the housing 12.

[0084] That is, in a broad sense, an embodiment of the present disclosure is a projection-type image display device having a housing, a projection optical system, an imaging device that captures a projection image projected by the projection optical system and reflected on a projection target, a bracket positioned relative to the housing, and first to fourth screws for positioning the imaging device relative to the bracket, wherein the bracket penetrates toward the imaging device in different directions when viewed in the extension direction of the imaging optical axis of the imaging device, and has first and second elongated through holes extending circumferentially of the imaging optical axis, and first and second female screw holes that penetrate toward the imaging device when viewed in the extension direction of the imaging optical axis, and the imaging device has third and fourth female screw holes that engage with the first and second screws that pass through the first and second through holes of the bracket, respectively, and first and second contact portions that contact the third and fourth screws that pass through the first and second female screw holes of the bracket, respectively.

[0085] As described above, the above-described embodiments have been described as examples of the technology of the present disclosure. For this purpose, drawings and detailed descriptions are provided. Therefore, the components described in the drawings and detailed descriptions may include not only components essential for solving the problem, but also components that are not essential for solving the problem in order to exemplify the above-described technology. Therefore, the fact that these non-essential components are described in the drawings or detailed descriptions should not be interpreted as immediately indicating that these non-essential components are essential.

[0086] Furthermore, since the above-described embodiments are intended to illustrate the technology of the present disclosure, various modifications, substitutions, additions, omissions, etc. may be made within the scope of the claims or their equivalents. [Industrial Applicability]

[0087] The present disclosure is applicable to projection-type image display devices. [Explanation of symbols]

[0088] 10 Projection-type image display device 30 Imaging device 32e Third female thread hole 32f 4th female thread hole 32g First contact 32h Second contact 36 Bracket 36c First through hole 36d Second through hole 36e First female thread hole 36f Second female thread hole 44 First Screw 46 Second screw 48 Third Screw 50 Fourth Screw

Claims

1. A housing; A projection optical system; an imaging device that captures a projection image projected by the projection optical system and reflected on a projection target; a bracket positioned relative to the housing; first to fourth screws for positioning the imaging device relative to the bracket; the bracket has first and second through holes each having a long hole shape, the first and second through holes penetrating toward the imaging device in different directions as viewed in the extension direction of an imaging optical axis of the imaging device and extending in a circumferential direction of the imaging optical axis; a first female screw hole and a second female screw hole that penetrate the imaging device when viewed in the direction in which the imaging optical axis extends; the imaging device has third and fourth female screw holes that engage with the first and second screws that pass through the first and second through holes of the bracket, respectively; a first contact portion and a second contact portion that come into contact with a third screw that has passed through the first female screw hole and a fourth female screw that has passed through the second female screw hole, respectively, of the bracket.

2. 2. The projection-type image display device according to claim 1, further comprising an elastic member disposed between said bracket and said image pickup device in an elastically deformed state.

3. an image forming device that forms the projected image; 2. The projection-type image display device according to claim 1, further comprising: an optical element disposed between the projection optical system and the image forming device, the optical element forming a projection optical path along which the projected image propagates from the image forming device to the projection optical system, and an optical element forming an imaging optical path along which the projected image propagates from the projection target to the imaging device via the projection optical system.

4. The imaging device a lens barrel having the imaging optical axis; an imaging element provided in the lens barrel, 2. The projection-type image display device according to claim 1, wherein the lens barrel comprises the third and fourth female screw holes and the first and second contact portions.

5. the housing has a mounting surface parallel to a projection optical axis of the projection optical system, the lens barrel has a reference plane perpendicular to the imaging optical axis, 5. The projection-type image display device according to claim 4, wherein the bracket is fixed to the housing so that the mounting surface and the reference surface are kept in contact with each other.

6. 5. The projection-type image display device according to claim 4, wherein the image pickup element is provided in the lens barrel so that its inclination with respect to the image pickup optical axis is adjustable.

7. 5. The projection-type image display device according to claim 4, wherein the image pickup element is provided on the lens barrel so that the position of the image pickup element relative to the lens barrel in the direction in which the image pickup optical axis extends is adjustable.

Images