Projection system and adjustment mechanism

Abstract

To enable light projected from a projection optical device to be easily projected to a desired location while suppressing an increase in the size of a projection system.SOLUTION: A projection system includes: a light source that emits light; a light modulator that modulates the light emitted from the light source; a projection optical device that projects the light modulated by the light modulator; and an adjustment mechanism disposed at a side of the projection optical device toward which the light is projected from the projection optical device. The adjustment mechanism has a movable section provided so as to be movable relative to the projection optical device, and a traveling direction of the light projected from the projection optical device is changed by the movable section moving relative to the projection optical device.SELECTED DRAWING: Figure 11

Description

Technical Field

[0001] The present disclosure relates to a projection system and an adjustment mechanism.

Background Art

[0002] For example, as shown in Patent Document 1, there is known a projector including a structure for adjusting the elevation angle of a projection lens by adjusting the amount of protrusion of a main leg protruding from the bottom surface of a housing from the bottom surface.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the method of adjusting the protrusion amount of the main leg as described above, there is a problem that it is difficult to widen the angle range of the adjustable projection lens and it is difficult to project light to a desired location. In particular, there is a problem that it is difficult to project light to the installation surface side where the main leg is installed. In response to this problem, for example, Patent Document 2 describes a shift mechanism that moves an optical unit including a projection optical system in a direction orthogonal to the optical axis of the projection optical system. By using such a shift mechanism, it is easy to change the direction in which light is projected. However, in this case, there is a problem that the projector becomes larger due to the provision of the shift mechanism.

Means for Solving the Problems

[0005] One aspect of the projection system of the present disclosure includes a light source that emits light, a light modulation device that modulates the light emitted from the light source, a projection optical device that projects the light modulated by the light modulation device, and an adjustment mechanism disposed on the side where light is projected from the projection optical device with respect to the projection optical device. The adjustment mechanism has a movable part provided so as to be relatively movable with respect to the projection optical device, and by the relative movement of the movable part with respect to the projection optical device, the traveling direction of the light projected from the projection optical device is changed.

[0006] One aspect of the adjustment mechanism of the present disclosure is an adjustment mechanism attached to a projector including a light source that emits light, a light modulation device that modulates the light emitted from the light source, and a projection optical device that projects the light modulated by the light modulation device. The adjustment mechanism has a movable part provided so as to be relatively movable with respect to the projection optical device, is disposed on the side where light is projected from the projection optical device with respect to the projection optical device, and by the relative movement of the movable part with respect to the projection optical device, the traveling direction of the light projected from the projection optical device is changed.

Brief Description of the Drawings

[0007]

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Modes for Carrying Out the Invention

[0008] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that the scope of the present disclosure is not limited to the following embodiments and can be arbitrarily changed within the scope of the technical idea of the present disclosure. Also, in the following drawings, in order to make each configuration easier to understand, the actual structure, scale, number, etc. in each structure may be made different.

[0009] The drawings show the X-axis, Y-axis, and Z-axis. The X-axis indicates one direction in the horizontal direction. The Y-axis indicates the other direction in the horizontal direction. The Z-axis indicates the vertical direction. In the following description, the horizontal direction along the X-axis is referred to as the "front-back direction X", the horizontal direction along the Y-axis is referred to as the "left-right direction Y", and the vertical direction along the Z-axis is referred to as the "vertical direction Z". The front-back direction X, the left-right direction Y, and the vertical direction Z are directions orthogonal to each other. The side (+Z side) in the vertical direction Z toward which the arrow of the Z-axis points is the upper side, and the side opposite to the side toward which the arrow of the Z-axis points (-Z side) in the vertical direction Z is the lower side. In the following description, the side (+X side) in the front-back direction X toward which the arrow of the X-axis points is the front side, and the side opposite to the side toward which the arrow of the X-axis points (-X side) in the front-back direction X is the rear side.

[0010] <First Embodiment> FIG. 1 is a schematic configuration diagram showing the projection system 100 in the present embodiment. FIG. 2 is a view of the projection system 100 seen in the left-right direction Y. FIG. 3 is a perspective view showing the projection system 100. FIG. 4 is an exploded perspective view showing the projection system 100. FIG. 5 is an exploded perspective view showing the projection system 100 and is a view of the projection system 100 seen from an angle different from that of FIG. 4.

[0011] As shown in Fig. 1, the projection system 100 of the present embodiment includes a projector 1 and an adjustment mechanism 30. The projector 1 of the present embodiment is a projection type image display device that projects a color image. As shown in Fig. 2, in the present embodiment, the case where the projector 1 is installed on an installation surface W2 facing upward will be described. The installation surface W2 is a flat surface orthogonal to the vertical direction Z. The color image projected from the projector 1 is projected at least onto a side wall surface W1 extending upward from the installation surface W2. The side wall surface W1 is located in front of the projector 1 and faces the rear. The side wall surface W1 is a flat surface orthogonal to the front-rear direction X.

[0012] As shown in Fig. 1, the projector 1 includes a light source 2, a uniform illumination optical system 20, a color separation optical system 3, a light modulation device 4R, a light modulation device 4G, a light modulation device 4B, a synthesis optical system 5, a projection optical device 6, and a control device 24. The light source 2 emits light. In the present embodiment, the light source 2 emits illumination light WL toward the uniform illumination optical system 20. The light source 2 is controlled by the control device 24.

[0013] The uniform illumination optical system 20 includes an integrator optical system 21, a polarization conversion element 22, and a superposition optical system 23. The integrator optical system 21 includes a first lens array 21a and a second lens array 21b. The uniform illumination optical system 20 equalizes the intensity distribution of the illumination light WL emitted from the light source 2 in each of the light modulation devices 4R, 4G, and 4B, which are the illuminated regions. The illumination light WL emitted from the uniform illumination optical system 20 enters the color separation optical system 3.

[0014] The color separation optical system 3 separates white illumination light WL into red light LR, green light LG, and blue light LB. The color separation optical system 3 includes a first dichroic mirror 7a, a second dichroic mirror 7b, a first reflection mirror 8a, a second reflection mirror 8b, a third reflection mirror 8c, a first relay lens 9a, and a second relay lens 9b.

[0015] The first dichroic mirror 7a separates the illumination light WL from the light source 2 into red light LR and other light, namely green light LG and blue light LB. The first dichroic mirror 7a transmits the separated red light LR and reflects the other light, namely green light LG and blue light LB. On the other hand, the second dichroic mirror 7b separates the other light into green light LG and blue light LB. The second dichroic mirror 7b reflects the separated green light LG and transmits the blue light LB.

[0016] The first reflection mirror 8a is disposed in the optical path of the red light LR and reflects the red light LR transmitted through the first dichroic mirror 7a toward the optical modulation device 4R. On the other hand, the second reflection mirror 8b and the third reflection mirror 8c are disposed in the optical path of the blue light LB and reflect the blue light LB transmitted through the second dichroic mirror 7b toward the optical modulation device 4B. Also, the green light LG is reflected by the second dichroic mirror 7b toward the optical modulation device 4G.

[0017] The first relay lens 9a and the second relay lens 9b are disposed on the light emission side of the second dichroic mirror 7b in the optical path of the blue light LB. The first relay lens 9a and the second relay lens 9b correct the difference in the illumination distribution of the blue light LB caused by the optical path length of the blue light LB being longer than the optical path lengths of the red light LR and the green light LG.

[0018] The optical modulation devices 4R, 4G, 4B modulate the light emitted from the light source 2. The optical modulation device 4R modulates the red light LR according to the image information and forms image light corresponding to the red light LR. The optical modulation device 4G modulates the green light LG according to the image information and forms image light corresponding to the green light LG. The optical modulation device 4B modulates the blue light LB according to the image information and forms image light corresponding to the blue light LB.

[0019] For the light modulation devices 4R, 4G, and 4B, a transmissive liquid crystal panel is used, for example. Further, polarizing plates (not shown) are respectively arranged on the incident side and the emission side of the liquid crystal panel, and are configured to allow only linearly polarized light in a specific direction to pass through.

[0020] Field lenses 10R, 10G, and 10B are respectively arranged on the incident sides of the light modulation devices 4R, 4G, and 4B. The field lenses 10R, 10G, and 10B collimate the principal rays of the red light LR, green light LG, and blue light LB incident on the respective light modulation devices 4R, 4G, and 4B.

[0021] When the image light emitted from the light modulation devices 4R, 4G, and 4B is incident on the combined optical system 5, the combined optical system 5 combines the image light corresponding to the red light LR, green light LG, and blue light LB, and emits the combined image light toward the projection optical device 6. For example, a cross dichroic prism is used for the combined optical system 5.

[0022] The projection optical device 6 projects the light modulated by the light modulation devices 4R, 4G, and 4B. In the present embodiment, the projection optical device 6 is composed of a plurality of projection lenses 6a arranged in the front-rear direction X. The projection optical device 6 enlarges and projects the image light LP1 combined by the combined optical system 5 forward. The image light LP1 projected from the projection optical device 6 is incident on the adjustment mechanism 30.

[0023] As shown in FIG. 2, the optical axis AXP of the projection optical device 6 extends parallel to the front-rear direction X. The image light LP1 projected forward from the projection optical device 6 spreads in the vertical direction Z and the left-right direction Y as it goes forward. In the present embodiment, the image light LP1 projected from the projection optical device 6 is projected in a direction offset upward (the first side of the second direction) in the vertical direction Z with respect to the optical axis AXP of the projection optical device 6. "The image light LP1 is offset upward" means that the center line LPC passing through the center of the image light LP1 in the vertical direction Z is located above the optical axis AXP. The center line LPC is located upward as it goes forward. The angle formed by the center line LPC with respect to the optical axis AXP is the driving-in angle φ. The driving-in angle φ is, for example, about 5° or more and 30° or less. In the present embodiment, the lower edge of the image light LP1 is at the same position as the optical axis AXP in the vertical direction Z. The upper edge of the image light LP1 is located upward as it goes forward.

[0024] The projector 1 includes a housing 25 that houses a light source 2 and light modulation devices 4R, 4G, and 4B inside. As shown in FIG. 1, in the present embodiment, the housing 25 houses a light source 2, a uniform illumination optical system 20, a color separation optical system 3, a light modulation device 4R, a light modulation device 4G, a light modulation device 4B, a combining optical system 5, a projection optical device 6, and a control device 24 inside.

[0025] As shown in FIG. 3, the housing 25 has a substantially rectangular parallelepiped box shape. The dimension of the housing 25 in the front-rear direction X is larger than the dimension of the housing 25 in the left-right direction Y. The dimension of the housing 25 in the vertical direction Z is smaller than the dimension of the housing 25 in the left-right direction Y. As shown in FIG. 4, an opening 25b is formed in the front surface 25a of the housing 25. The opening 25b is a substantially rectangular hole that is long in the left-right direction Y. Through the opening 25b, the projection lens 6a located most forward among the plurality of projection lenses 6a of the projection optical device 6 is exposed outside the housing 25. The optical axis of the projection lens 6a, that is, the optical axis AXP of the projection optical device 6, passes through the opening 25b.

[0026] As shown in FIG. 5, front legs 26a and rear legs 26b are provided on the lower surface 25c of the housing 25. The front legs 26a and the rear legs 26b protrude downward from the lower surface 25c. The front legs 26a are located forward of the rear legs 26b. In the present embodiment, one front leg 26a is provided at the center in the left - right direction Y on the lower surface 25c. Two rear legs 26b are provided at intervals in the left - right direction Y. As shown in FIG. 2, the lower ends of the front legs 26a and the lower ends of the rear legs 26b are in contact with the installation surface W2. The projector 1 is installed on the installation surface W2 via the front legs 26a and the rear legs 26b.

[0027] The adjustment mechanism 30 is disposed on the side from which light is projected from the projection optical device 6 with respect to the projection optical device 6, that is, the front side. In the present embodiment, the adjustment mechanism 30 is attached to the projector 1. More specifically, the adjustment mechanism 30 is detachably attached to the housing 25. The adjustment mechanism 30 is a mechanism that changes the traveling direction of the light projected from the projection optical device 6, that is, the image light LP1. FIG. 6 is a perspective view showing the adjustment mechanism 30. FIG. 7 is an exploded perspective view showing the adjustment mechanism 30. FIG. 8 is a partial cross - sectional view showing the adjustment mechanism 30. As shown in FIG. 6, the adjustment mechanism 30 includes a fixed member 40 and a movable member 70.

[0028] In the following description, for a certain object, the side closer to the center of the adjustment mechanism 30 in the left - right direction Y may be referred to as the "inner side in the left - right direction", and the side farther from the center of the adjustment mechanism 30 in the left - right direction Y may be referred to as the "outer side in the left - right direction". In the present embodiment, the center of the adjustment mechanism 30 in the left - right direction Y is at the same position in the left - right direction Y as the optical axis AXS of the optical element 60 described later.

[0029] The fixing member 40 is a member fixed to the housing 25. As shown in FIG. 7, in the present embodiment, the fixing member 40 is a sheet metal member. The fixing member 40 has a front wall portion 41, a lower wall portion 42, and a pair of mounting portions 43. The front wall portion 41 has a substantially rectangular plate shape with the plate surface facing the front-rear direction X and being long in the left-right direction Y. A through hole 41a is formed in the front wall portion 41. The through hole 41a is a rectangular hole long in the left-right direction Y. As shown in FIG. 8, the front wall portion 41 is located in front of the front surface 25a of the housing 25. The rear surface of the front wall portion 41 is in contact with the front surface 25a. The through hole 41a overlaps the opening 25b when viewed in the front-rear direction X. As shown in FIG. 7, projecting portions 41b projecting outward in the left-right direction are formed at both edge portions on the outer side in the left-right direction of the front wall portion 41.

[0030] As shown in FIG. 7, the lower wall portion 42 projects rearward from the lower end portion of the front wall portion 41. The lower wall portion 42 has a plate shape with the plate surface facing the vertical direction Z. A hole 42a penetrating the lower wall portion 42 in the vertical direction Z is formed in the lower wall portion 42. Two holes 42a are formed at intervals in the left-right direction Y. As shown in FIG. 5, the lower wall portion 42 is located below the lower surface 25c of the housing 25. The upper surface of the lower wall portion 42 is in contact with the lower surface 25c. A screw member 71 is passed through each hole 42a from below. Each screw member 71 passed through each hole 42a is tightened to the lower surface 25c of the housing 25. In the present embodiment, the fixing member 40 is detachably fixed to the housing 25 by two screw members 71.

[0031] As shown in FIG. 7, the pair of mounting portions 43 are respectively connected to the outer ends in the left-right direction of the projecting portions 41b formed at both edge portions in the left-right direction Y of the front wall portion 41. The pair of mounting portions 43 project forward from the respective projecting portions 41b. The pair of mounting portions 43 project outward in the vertical direction Z from the pair of projecting portions 41b. In the present embodiment, the pair of mounting portions 43 have a plate shape with the plate surface facing the left-right direction Y. The pair of mounting portions 43 have a substantially triangular plate shape convex upward. The pair of mounting portions 43 are arranged at intervals in the left-right direction Y with respect to each other.

[0032] Each mounting portion 43 is formed with a support hole 43a and a guide hole 43b that penetrate the mounting portion 43 in the left - right direction Y. The support hole 43a is formed in a portion of the mounting portion 43 that is located above the protruding portion 41b. In the present embodiment, the support hole 43a is a circular hole. A rotation axis R1, which is a virtual line extending in the left - right direction Y, passes through the support hole 43a. The rotation axis R1 is a rotation axis that extends in the left - right direction (first direction) Y orthogonal to the optical axis AXP of the projection optical device 6.

[0033] In the present embodiment, the left - right direction Y corresponds to the "first direction" orthogonal to the optical axis AXP of the projection optical device 6, and the vertical direction Z corresponds to the "second direction" orthogonal to both the optical axis AXP of the projection optical device 6 and the first direction. Also, the upper side of the vertical direction Z corresponds to the "first side of the second direction", and the lower side of the vertical direction Z corresponds to the "second side of the second direction".

[0034] The guide hole 43b is formed in a portion of the mounting portion 43 that is located below the protruding portion 41b. The guide hole 43b is arranged radially away from the support hole 43a around the rotation axis R1. The guide hole 43b is located below the support hole 43a. The guide hole 43b extends in the circumferential direction around the rotation axis R1. The guide hole 43b is an arc - shaped hole. In the present embodiment, the guide hole 43b extends in an arc shape forward from a portion directly below the support hole 43a in the mounting portion 43. The rear - side end of the guide hole 43b is located directly below the support hole 43a. The guide hole 43b protrudes forward from the support hole 43a.

[0035] The movable part 70 is a part provided so as to be relatively movable with respect to the projection optical device 6. In the present embodiment, the movable part 70 is rotatable about a rotation axis R1 extending in the left-right direction Y orthogonal to the optical axis AXP of the projection optical device 6 with respect to the projection optical device 6. In the present embodiment, the movable part 70 is rotatable about the rotation axis R1 with respect to the fixed member 40, and thus is rotatable about the rotation axis R1 with respect to the projection optical device 6. The rotation angle θ of the movable part 70 about the rotation axis R1 is set to 0 [°] in the state shown in FIG. 8. The relative positional relationship of each part in the following description is the relative positional relationship in the case where the rotation angle θ of the movable part 70 is 0 [°] unless otherwise specified. When the rotation angle θ of the movable part 70 is 0 [°], the front-rear direction X is the direction in which the optical axis AXS of the optical element 60 extends.

[0036] As shown in FIG. 6, in the present embodiment, the movable part 70 is attached to the fixed member 40. The movable part 70 is located in front of the fixed member 40. The movable part 70 is sandwiched in the left-right direction Y by a pair of attachment parts 43. The movable part 70 includes a holding part 50 and an optical element 60.

[0037] As shown in FIG. 8, image light LP1 projected from the projection optical device 6 is incident on the optical element 60. In the present embodiment, the optical element 60 is an optical element that expands the angular field of view of the image light LP1 projected from the projection optical device 6. The optical element 60 is, for example, a wide converter lens. The optical element 60 emits the image light LP1 incident from the projection optical device 6 forward as image light LS1 with an expanded angular field of view. The optical axis AXS of the optical element 60 coincides with the optical axis AXP of the projection optical device 6 when the rotation angle θ of the movable part 70 is 0 [°]. When the rotation angle θ of the movable part 70 is 0 [°], the optical axis AXS of the optical element 60 extends parallel to the front-rear direction X.

[0038] The optical element 60 includes a lens housing 61 and a plurality of lenses 62. The lens housing 61 has a multi-stage substantially cylindrical shape extending along the optical axis AXS. The outer diameter of the front end portion of the lens housing 61 is larger than the outer diameter of the rear end portion of the lens housing 61. A threaded portion 61a is formed at the rear end portion of the lens housing 61. The optical element 60 can be externally attached to, for example, a lens of a camera via the threaded portion 61a. The plurality of lenses 62 are housed inside the lens housing 61. The plurality of lenses 62 are arranged side by side in the extending direction of the optical axis AXS. The lens 62 located at the most rearward position among the plurality of lenses 62 faces the projection lens 6a located at the most forward position in the projection optical device 6.

[0039] The holding portion 50 holds the optical element 60. The holding portion 50 includes a first holding member 51 and a second holding member 52 that sandwich the optical element 60 in the direction in which the optical axis AXS of the optical element 60 extends. The first holding member 51 and the second holding member 52 are fixed to each other. The first holding member 51 is rotatably attached to the fixing member 40 about the rotation axis R1. The second holding member 52 is located in front of the first holding member 51. As shown in FIG. 7, in the present embodiment, the first holding member 51 and the second holding member 52 are sheet metal members.

[0040] The first holding member 51 includes a first wall portion 53 and a pair of first connecting portions 54. The first wall portion 53 has a plate shape with the plate surface facing the front-rear direction X. A concave portion 53c that is recessed downward is formed at the upper edge portion of the first wall portion 53. A concave portion 53d that is recessed upward is formed at the lower edge portion of the first wall portion 53. The concave portions 53c and 53d extend in the left-right direction Y. Through holes 53b that penetrate the first wall portion 53 in the front-rear direction X are formed at both edge portions on the outer side in the left-right direction of the first wall portion 53. Each through hole 53b is a substantially rectangular hole that is long in the vertical direction Z. As shown in FIG. 8, the first wall portion 53 is disposed to face the front of the front wall portion 41 of the fixing member 40. The first wall portion 53 is provided at a distance in front of the front wall portion 41.

[0041] The first wall portion 53 is formed with an insertion hole 53a that penetrates the first wall portion 53 in the front-rear direction X. The insertion hole 53a is a circular hole centered on the optical axis AXS. The rear portion of the optical element 60 is passed through the insertion hole 53a. In the present embodiment, the threaded portion 61a of the lens housing 61 is passed through the insertion hole 53a. The threaded portion 61a is, for example, fitted into the insertion hole 53a with a clearance. The rear end portion of the optical element 60 protrudes rearward from the insertion hole 53a. The portion of the optical element 60 located rearward of the insertion hole 53a is located in the clearance in the front-rear direction X between the first wall portion 53 and the front wall portion 41.

[0042] As shown in FIG. 7, the pair of first connecting portions 54 are respectively connected to both edge portions on the outer side in the left-right direction of the first wall portion 53. The pair of first connecting portions 54 are plate-shaped with the plate surface facing the left-right direction Y. The pair of first connecting portions 54 protrude on both sides in the front-rear direction X from the first wall portion 53. The pair of first connecting portions 54 respectively form the outer edges in the left-right direction of the pair of through holes 53b. The pair of first connecting portions 54 are arranged symmetrically with respect to the left-right direction Y. Each of the pair of first connecting portions 54 has a first connecting wall portion 54b and a second connecting wall portion 54d.

[0043] The first connecting wall portion 54b protrudes forward from the edge portion on the outer side in the left-right direction of the first wall portion 53. A pair of first connecting wall portions 54b are provided at intervals in the vertical direction Z. The upper first connecting wall portion 54b of the pair of first connecting wall portions 54b protrudes forward from the portion of the edge portion on the outer side in the left-right direction of the first wall portion 53 that is located above the through hole 53b. The lower first connecting wall portion 54b of the pair of first connecting wall portions 54b protrudes forward from the portion of the edge portion on the outer side in the left-right direction of the first wall portion 53 that is located below the through hole 53b. Each first connecting wall portion 54b is formed with a threaded hole 54c that penetrates the first connecting wall portion 54b in the left-right direction Y.

[0044] The second connecting wall portion 54d is located between the pair of first connecting wall portions 54b in the vertical direction Z. The second connecting wall portion 54d extends in the vertical direction Z. The second connecting wall portion 54d connects the pair of first connecting wall portions 54b. The second connecting wall portion 54d is provided at the same position as the through hole 53b in the vertical direction Z. The second connecting wall portion 54d protrudes rearward from the first wall portion 53. A first screw hole 54e and a second screw hole 54f are formed in the second connecting wall portion 54d. The first screw hole 54e is formed in the upper portion of the second connecting wall portion 54d. The first screw hole 54e is located below the screw hole 54c formed in the upper first connecting wall portion 54b. The rotation axis R1 passes through the first screw hole 54e. The second screw hole 54f is formed in the lower portion of the second connecting wall portion 54d. The second screw hole 54f is located below the first screw hole 54e. The second screw hole 54f is located above the screw hole 54c formed in the lower first connecting wall portion 54b.

[0045] As shown in FIG. 6, the second connecting wall portion 54d is located inside the mounting portion 43 of the fixing member 40 in the left - right direction. The second connecting wall portion 54d in the pair of first connecting portions 54 is sandwiched in the left - right direction Y by the pair of mounting portions 43. The pair of second connecting wall portions 54d are in contact with the pair of mounting portions 43 respectively. Each of the pair of second connecting wall portions 54d is attached to each of the pair of mounting portions 43 by a first screw member 73a and a second screw member 73b. The first screw member 73a is passed through the support hole 43a of the mounting portion 43 from the outside in the left - right direction and tightened into the first screw hole 54e of the second connecting wall portion 54d. The rotation axis R1 passes through the first screw member 73a. The second screw member 73b is passed through the guide hole 43b of the mounting portion 43 from the outside in the left - right direction and tightened into the second screw hole 54f of the second connecting wall portion 54d. Thereby, the movable portion 70 is attached to the fixing member 40 by the first screw member 73a passing through the support hole 43a and the second screw member 73b passing through the guide hole 43b.

[0046] In a state where the first screw member 73a and the second screw member 73b are loosened, the first holding member 51 is rotatable about the rotation axis R1 within a range where the second screw member 73b can move in the guide hole 43b. Thereby, the movable part 70 is relatively rotatable about the rotation axis R1 with respect to the fixed member 40 and the projection optical device 6. With the movable part 70 rotated about the rotation axis R1 with respect to the fixed member 40 and the projection optical device 6 so that the rotation angle θ of the movable part 70 is a desired angle, by tightening the first screw member 73a and the second screw member 73b, the rotation angle θ of the movable part 70 can be fixed at a desired angle.

[0047] As shown in FIG. 7, the second holding member 52 includes a second wall portion 55 and a pair of second connecting portions 56. The second wall portion 55 is plate-shaped with a plate surface facing in the front-rear direction X. The second wall portion 55 sandwiches the optical element 60 between it and the first wall portion 53 in the front-rear direction X. A projection hole 55a penetrating the second wall portion 55 in the front-rear direction X is formed in the second wall portion 55. The projection hole 55a is a circular hole centered on the optical axis AXS. The inner diameter of the projection hole 55a is larger than the inner diameter of the insertion hole 53a. The inner diameter of the projection hole 55a is smaller than the outer diameter of the front end portion of the optical element 60. The outer peripheral edge portion of the front end surface of the optical element 60 is in contact with the peripheral edge portion of the projection hole 55a on the rear surface of the second wall portion 55.

[0048] The pair of second connecting portions 56 project rearward from both edge portions on the outer side in the left-right direction of the second wall portion 55. The pair of second connecting portions 56 are plate-shaped with their plate surfaces facing the left-right direction Y. The pair of second connecting portions 56 face each other with a space therebetween in the left-right direction Y. Each second connecting portion 56 has a base portion 56a and a third connecting wall portion 56b. The base portion 56a is a portion connected to the edge portion on the outer side in the left-right direction of the second wall portion 55. The base portion 56a extends in the vertical direction Z. The third connecting wall portion 56b projects rearward from the base portion 56a. A pair of third connecting wall portions 56b are provided with a space therebetween in the vertical direction Z. One of the third connecting wall portions 56b projects rearward from the upper end portion of the base portion 56a. The other third connecting wall portion 56b projects rearward from the lower end portion of the base portion 56a. As shown in FIG. 6, the pair of third connecting wall portions 56b are respectively located on the outer sides in the left-right direction of the pair of first connecting wall portions 54b and are respectively in contact with the pair of first connecting wall portions 54b.

[0049] A fixing hole 57 is formed in the second holding member 52. In the present embodiment, the fixing hole 57 is formed in each of the third connecting wall portions 56b. The fixing hole 57 is a hole through which a screw member 72 for fixing the second holding member 52 to the first holding member 51 can pass. The fixing hole 57 penetrates the third connecting wall portion 56b in the left-right direction Y. In the present embodiment, a plurality of fixing holes 57 are formed side by side in the front-rear direction X. Each fixing hole 57 is a hole having a dimension in the left-right direction Y larger than the dimension in the vertical direction Z. That is, the projection system 100 of the present embodiment satisfies both that a plurality of fixing holes 57 are formed side by side in the direction in which the optical axis AXS of the optical element 60 extends and that the fixing holes 57 are holes long in the direction in which the optical axis AXS of the optical element 60 extends.

[0050] In the present embodiment, two fixing holes 57, i.e., a first fixing hole 57a and a second fixing hole 57b, are provided for each third connecting wall portion 56b. The first fixing hole 57a is located forward of the second fixing hole 57b. In the present embodiment, a screw member 72 is passed through the first fixing hole 57a in the left - right direction Y. The screw members 72 passed through each first fixing hole 57a from the outside in the left - right direction are tightened into the respective screw holes 54c formed in each first connecting wall portion 54b. Thereby, the first holding member 51 and the second holding member 52 are fixed to each other. In the present embodiment, the first holding member 51 and the second holding member 52 are fixed to each other by four screw members 72.

[0051] FIG. 9 is a partial cross - sectional view showing the adjustment mechanism 30, and shows a state in which the movable part 70 has rotated around the rotation axis R1 with respect to the adjustment mechanism 30 shown in FIG. 8. FIG. 10 is a view of the projection system 100 seen in the left - right direction Y, and shows a state in which the movable part 70 has rotated around the rotation axis R1 with respect to the projection system 100 shown in FIG. 2. FIG. 11 is a view of the projection system 100 seen in the left - right direction Y, and shows a state in which the movable part 70 has further rotated around the rotation axis R1 with respect to the projection system 100 shown in FIG. 10. FIG. 10 shows the case where the rotation angle θ of the movable part 70 is α [°]. FIGS. 9 and 11 show the case where the rotation angle θ of the movable part 70 is β [°] which is larger than α [°]. In the example of each figure, α [°] is 10 [°] and β [°] is 20 [°]. α [°] and β [°] are not particularly limited.

[0052] As shown in FIGS. 9, 10, and 11, in the present embodiment, the movable part 70 is relatively rotatable about the rotation axis R1 with respect to the projection optical device 6 toward the upper side, that is, the first side in the second direction. Note that in this specification, "the movable part is rotatable about the rotation axis toward a certain side" means that the position of the movable part can be changed to a certain side by rotating the movable part about the rotation axis. The movable part 70 shown in FIGS. 9, 10, and 11 is in a state of being rotated about the rotation axis R1 in a direction of moving forward and upward with respect to the movable part 70 shown in FIGS. 2 and 8.

[0053] As shown in FIG. 8, in the present embodiment, when the rotation angle θ of the movable part 70 is 0 [°], among the image light LP1 emitted from the projection optical device 6, the image light LP1a that travels in the front-rear direction X along the optical axis AXP of the projection optical device 6, even if it enters the optical element 60, does not change its traveling direction and is emitted from the optical element 60 as the image light LS1a along the optical axis AXS of the projection optical device 6. Among the image light LP1 emitted from the projection optical device 6, the image light LP1b that travels in a direction inclined with respect to the optical axis AXP of the projection optical device 6 enters the optical element 60, and its traveling direction is changed in a direction in which the inclination with respect to the optical axis AXP becomes larger, and is emitted from the optical element 60 as the image light LS1b. The inclination of the image light LS1b with respect to the optical axis AXS is larger than the inclination of the image light LP1b with respect to the optical axis AXP. The image light LP1b and LS1b are light that travels upward as they travel forward.

[0054] As shown in FIG. 9, when the rotation angle θ of the movable part 70 is greater than 0 [°], among the image lights LP1 emitted from the projection optical device 6, the image light LP1a traveling in the front-rear direction X along the optical axis AXP of the projection optical device 6 is incident on the optical element 60 in a direction inclined with respect to the optical axis AXS of the optical element 60. Therefore, the traveling direction of the image light LP1a is changed in the direction in which the inclination with respect to the optical axis AXS of the optical element 60 increases, and it is emitted from the optical element 60 as the image light LS1c. When the rotation angle θ of the movable part 70 is greater than 0 [°], the image light LP1a along the optical axis AXP of the projection optical device 6 becomes light inclined downward with respect to the optical axis AXS of the optical element 60. Therefore, the image light LS1c emitted from the optical element 60 becomes light whose traveling direction is changed in the direction in which the inclination downward with respect to the optical axis AXS increases. As a result, the image light LS1c becomes light that goes downward as it goes forward.

[0055] The degree of change in the traveling direction of light by the optical element 60 increases as the inclination of the light incident on the optical element 60 with respect to the optical axis AXS increases. In the present embodiment, as the rotation angle θ increases, the inclination of the image light LP1a with respect to the optical axis AXS of the optical element 60 increases. Therefore, as the rotation angle θ increases, the degree of change in the traveling direction of the image light LP1a by the optical element 60 increases, and the inclination of the image light LS1c emitted from the optical element 60 with respect to the front-rear direction X increases. That is, as the rotation angle θ increases, the image light LS1c becomes light inclined downward.

[0056] When the rotation angle θ of the movable part 70 is greater than 0 [°], among the image lights LP1 emitted from the projection optical device 6, the image light LP1b traveling in a direction inclined with respect to the optical axis AXP of the projection optical device 6 has a smaller inclination with respect to the optical axis AXS of the optical element 60 than when the rotation angle θ is 0 [°]. Therefore, the degree of change in the traveling direction of the image light LP1b by the optical element 60 is smaller than when the rotation angle θ is 0 [°]. In the example of FIG. 9, since the image light LP1b is light traveling parallel to the optical axis AXS of the optical element 60, the traveling direction of the image light LP1b is not changed, and it is emitted from the optical element 60 as the image light LS1d parallel to the optical axis AXS.

[0057] As described above, when the movable part 70 rotates around the rotation axis R1, the relative inclination of the image light LP1 emitted from the projection optical device 6 with respect to the optical element 60 changes, and the degree of change in the traveling direction of the image light LP1 changed by the optical element 60 changes. As a result, the adjustment mechanism 30 changes the traveling direction of the image light LP1 projected from the projection optical device 6 by the relative movement of the movable part 70 with respect to the projection optical device 6. In the present embodiment, since the movable part 70 rotates around the rotation axis R1 upward with respect to the projection optical device 6, as shown in FIGS. 10 and 11, the more the movable part 70 rotates, the traveling direction of the image light LS1 emitted from the optical element 60 changes downward in the vertical direction Z. As a result, by rotating the movable part 70 of the adjustment mechanism 30, the image light LS1 emitted from the optical element 60 can be projected not only on the side wall surface W1 but also on the installation surface W2. Thus, the projection system 100 of the present embodiment can project light onto two or more surfaces facing different directions.

[0058] According to this embodiment, the projection system 100 includes a light source 2 that emits light, light modulation devices 4R, 4G, and 4B that modulate the light emitted from the light source 2, a projection optical device 6 that projects the light modulated by the light modulation devices 4R, 4G, and 4B, and an adjustment mechanism 30 disposed on the side where light is projected from the projection optical device 6 with respect to the projection optical device 6. The adjustment mechanism 30 has a movable part 70 provided so as to be relatively movable with respect to the projection optical device 6, and when the movable part 70 moves relative to the projection optical device 6, the traveling direction of the light projected from the projection optical device 6 is changed. Therefore, without providing a mechanism for moving the projection optical device 6 in the projector 1, the traveling direction of the light projected from the projection optical device 6 can be changed by the adjustment mechanism 30. As a result, while suppressing the enlargement of the projection system 100, the light projected from the projection optical device 6 can be easily projected to a desired location. Specifically, in this embodiment, the image light LP1 projected from the projection optical device 6 can be projected not only on the side wall surface W1 located in front of the projection system 100 but also on the installation surface W2 on which the projection system 100 is installed.

[0059] Also, according to this embodiment, the movable part 70 has an optical element 60 into which the light projected from the projection optical device 6 is incident. Therefore, the traveling direction of the light projected from the projection optical device 6 can be easily changed by the optical element 60.

[0060] Further, according to the present embodiment, the optical element 60 is an optical element that expands the angular field of the light projected from the projection optical device 6. Therefore, the light projected from the projection system 100 can be more easily projected to a desired location. In particular, when the light projected from the projection optical device 6 is projected in a direction offset upward with respect to the optical axis AXP of the projection optical device 6 as in the present embodiment, the light projected from the projection optical device 6 is difficult to be projected onto the installation surface W2. However, since the angular field of the light projected from the projection optical device 6 can be widened by the optical element 60 as in the present embodiment, the rotation angle θ of the movable part 70 can be adjusted as described above to change the traveling direction of the light projected from the projection optical device 6 downward. Thereby, the light projected from the projection optical device 6 can be more easily projected onto the installation surface W2.

[0061] Further, according to the present embodiment, the movable part 70 has a holding part 50 that holds the optical element 60. The holding part 50 has a first holding member 51 and a second holding member 52 that sandwich the optical element 60 in the direction in which the optical axis AXS of the optical element 60 extends. The first holding member 51 and the second holding member 52 are fixed to each other. Therefore, the optical element 60 can be easily and stably held by the holding part 50. Further, a filter or the like can be disposed on the light emission side of the optical element 60, and the filter and the optical element 60 can be held together by being sandwiched between the first holding member 51 and the second holding member 52. Thereby, the light emitted from the optical element 60 can be easily adjusted by the filter.

[0062] Further, according to the present embodiment, the second holding member 52 is formed with a first fixing hole 57a through which a screw member 72 for fixing the second holding member 52 to the first holding member 51 can pass. The projection system 100 satisfies both that a second fixing hole 57b is formed in the second holding member 52 side by side with the first fixing hole 57a in the direction in which the optical axis AXS of the optical element 60 extends, and that the first fixing hole 57a is a long hole in the direction in which the optical axis AXS of the optical element 60 extends. Therefore, by changing the fixing hole 57 through which the screw member 72 passes between the first fixing hole 57a and the second fixing hole 57b, or by changing the position where the screw member 72 passes within the first fixing hole 57a, the distance between the first holding member 51 and the second holding member 52 can be changed. More specifically, the distance between the first wall portion 53 and the second wall portion 55 can be changed. Thereby, a plurality of types of optical elements 60 having different dimensions in the direction in which the optical axis AXS extends can be held by being sandwiched between the first holding member 51 and the second holding member 52.

[0063] Specifically, for example, as shown in FIG. 12, an optical element 160 having a larger dimension in the direction in which the optical axis AXS extends than the above-described optical element 60 can be held by the holding portion 50. FIG. 12 is a view of the adjustment mechanism 130 having different optical elements 160 as seen in the left-right direction Y. As shown in FIG. 12, in the adjustment mechanism 130, the screw member 72 is passed through a second fixing hole 57b located behind the first fixing hole 57a. Thereby, the dimension of the holding portion 50 in the direction in which the optical axis AXS extends becomes larger than that of the above-described adjustment mechanism 30, and an optical element 160 larger than the optical element 60 can be held.

[0064] Note that, in the projection system 100, only one of the following two conditions may be satisfied: the second fixing hole 57b is formed in the second holding member 52 in a line with the first fixing hole 57a in the direction in which the optical axis AXS of the optical element 60 extends; and the first fixing hole 57a is a long hole in the direction in which the optical axis AXS of the optical element 60 extends. Even in this case, the holding unit 50 can hold a plurality of types of optical elements 60 having different dimensions in the direction in which the optical axis AXS extends. Further, instead of providing a plurality of fixing holes 57 for each of the third connecting wall portions 56b of the second holding member 52, one first fixing hole 157 as shown by the two-dot chain line in FIG. 12 may be provided for each of the third connecting wall portions 56b. The first fixing hole 157 is a hole having a shape in which the above-described first fixing hole 57a and second fixing hole 57b are connected to form a single long hole. Even in this case, the dimension of the optical element 60 that can be held by the holding unit 50 can be changed by changing the position of the portion of the first fixing hole 157 through which the screw member 72 passes in the direction in which the optical axis AXS extends.

[0065] Further, according to the present embodiment, the movable unit 70 is rotatable about a rotation axis R1 extending in the left-right direction Y (first direction) orthogonal to the optical axis AXP of the projection optical device 6 with respect to the projection optical device 6. Therefore, by rotating the movable unit 70 about the rotation axis R1, the traveling direction of the image light LP1 projected from the projection optical device 6 can be easily changed.

[0066] Further, according to the present embodiment, the image light LP1 projected from the projection optical device 6 is projected in a direction offset upward (first side) in the vertical direction Z (second direction) that is orthogonal to both the optical axis AXP of the projection optical device 6 and the left-right direction Y (first direction) with respect to the optical axis AXP of the projection optical device 6. The movable part 70 is relatively rotatable about the rotation axis R1 with respect to the projection optical device 6 toward the upper side (first side). Therefore, the optical element 60 can be an optical element capable of expanding the angle of view, and by rotating it about the rotation axis R1 upward, the traveling direction of the image light LP1 offset upward can be changed downward. Thereby, the light emitted from the projection system 100 can be easily projected onto the installation surface W2.

[0067] Further, according to the present embodiment, the projection system 100 includes a housing 25 that houses the light source 2 and the light modulation devices 4R, 4G, and 4B inside. The adjustment mechanism 30 has a fixing member 40 fixed to the housing 25. The fixing member 40 is formed with a support hole 43a through which the rotation axis R1 passes, and a guide hole 43b that is arranged radially away from the support hole 43a around the rotation axis R1 and extends in the circumferential direction around the rotation axis R1. The movable part 70 is attached to the fixing member 40 by a first screw member 73a passing through the support hole 43a and a second screw member 73b passing through the guide hole 43b. Therefore, by loosening the first screw member 73a and the second screw member 73b, the movable part 70 can be rotated about the rotation axis R1 within the range in which the second screw member 73b can relatively move in the guide hole 43b. Further, after setting the rotation angle θ of the movable part 70 to a desired angle, by tightening the first screw member 73a and the second screw member 73b, the rotation angle θ of the movable part 70 can be held at the desired angle. Therefore, the rotation angle θ of the movable part 70 can be easily adjusted, and the traveling direction of the light projected from the projection system 100 can be easily adjusted by the adjustment mechanism 30.

[0068] Further, according to the present embodiment, the adjustment mechanism 30 is an adjustment mechanism attached to the projector 1. Therefore, without changing the structure of the projector 1, by attaching the adjustment mechanism 30 to the projector 1, the traveling direction of the light projected from the projection optical device 6 of the projector 1 can be changed by the adjustment mechanism 30.

[0069] Hereinafter, embodiments different from the above-described embodiment will be described. In the description of each of the following embodiments, for configurations similar to those described above the upper stage of the description of each embodiment, the description may be omitted by appropriately assigning the same reference numerals. Also, for parts corresponding to each part of the configuration described above the upper stage of the description of each embodiment, the same name is given and different reference numerals are given to describe the differences from the above-described configuration, and the description of the same points as the above-described configuration may be omitted. Note that, as the configurations omitted in the following embodiments, within a non-contradictory range, configurations similar to those described above the upper stage of each embodiment can be adopted.

[0070] <Second Embodiment> In this embodiment, the relative positional relationship between the projection optical device 206 and the adjustment mechanism 30 is different from that in the first embodiment. FIG. 13 is a partial cross-sectional view showing a part of the projection system 200 in this embodiment.

[0071] As shown in FIG. 13, the projection optical device 206 in the projector 201 of the projection system 200 is located below the projection optical device 6 of the first embodiment. The optical axis AXP of the projection optical device 206 is located below the optical axis AXS of the optical element 60 in a state where the rotation angle θ of the movable part 70 is 0 [°] and is parallel to the optical axis AXS of the optical element 60. Other configurations of the projection system 200 are the same as those of the projection system 100 in the first embodiment.

[0072] According to the present embodiment, in the same manner as in the first embodiment, the traveling direction of the light projected from the projection optical device 206 can be changed by the adjustment mechanism 30. As a result, while suppressing the enlargement of the projection system 200, the light emitted from the projection optical device 206 can be easily projected onto a desired location.

[0073] Further, according to the present embodiment, in a state where the optical axis AXP of the projection optical device 206 and the optical axis AXS of the optical element 60 are parallel to each other, the optical axis AXP of the projection optical device 206 is displaced downward from the optical axis AXS of the optical element 60. Therefore, when the light projected from the projection optical device 206 is offset upward, the light projected from the projection optical device 206 can be easily made to enter the optical element 60. As a result, it is possible to suppress a part of the light projected from the projection optical device 206 from being kicked by the lens housing 61 or the like of the optical element 60.

[0074] <Third Embodiment> In the present embodiment, the structure of the adjustment mechanism 330 is different from that of the first embodiment. FIG. 14 is a view of a part of the projection system 300 in the present embodiment as seen in the left-right direction Y. FIG. 15 is a view of a part of the projection system 300 in the present embodiment as seen in the left-right direction Y, showing a state in which the movable part 370 is tilted upward. FIG. 16 is a view of a part of the projection system 300 in the present embodiment as seen in the left-right direction Y, showing a state in which the movable part 370 is tilted downward.

[0075] As shown in FIG. 14, the image light LP3 projected from the projection optical device 306 in the projector 301 of the projection system 300 is projected in a direction that is not offset in the vertical direction Z (second direction), which is orthogonal to both the optical axis AXP of the projection optical device 306 and the left-right direction Y (first direction), with respect to the optical axis AXP of the projection optical device 306. That is, the center line LPC of the image light LP3 projected from the projection optical device 306 coincides with the optical axis AXP. The image light LP3 projected from the projection optical device 306 spreads on both sides in the vertical direction Z and both sides in the left-right direction Y around the optical axis AXP as it travels forward.

[0076] The guide hole 343b formed in the attachment portion 343 of the fixing member 340 of the adjustment mechanism 330 is arc-shaped centered on the rotation axis R1. The guide hole 343b extends on both sides in the front-rear direction X from the support hole 43a through which the rotation axis R1 passes. Thereby, in the present embodiment, the movable portion 370 is relatively rotatable around the rotation axis R1 toward the upper side (first side of the second direction) and the lower side (second side of the second direction) in the vertical direction Z with respect to the projection optical device 306. In FIG. 15, the second screw member 73b is passed through the front end portion of the guide hole 343b, showing a state where the movable portion 370 rotates around the rotation axis R1 upward. In FIG. 16, the second screw member 73b is passed through the rear end portion of the guide hole 343b, showing a state where the movable portion 370 rotates around the rotation axis R1 downward. The rotation angle θ of the movable portion 370 in FIG. 15 is β [°]. The rotation angle θ of the movable portion 370 in FIG. 16 is -β [°]. In FIG. 15, β [°] is 20 [°], and in FIG. 16, -β [°] is -20 [°].

[0077] In this embodiment, since the image light LP3 projected from the projection optical device 306 is not offset, the image light LP3 projected from the projection optical device 306 includes image light LP3a that goes upward as it goes forward and image light LP3b that goes downward as it goes forward. As shown in FIG. 14, when the rotation angle θ of the movable part 370 is 0 [°] in this embodiment, the traveling directions of the image lights LP3a and LP3b are changed by the optical element 60 in the directions in which the angles with respect to the optical axes AXP and AXS increase, respectively, and are emitted from the optical element 60 as image lights LS3a and LS3b. When the rotation angle θ of the movable part 370 is 0 [°], the image light LS3 emitted from the optical element 60 is emitted while being spread wider on both sides in the vertical direction Z and both sides in the left-right direction Y than the image light LP3 emitted from the projection optical device 306.

[0078] As shown in FIG. 15, when the movable part 370 rotates about the rotation axis R1 upward, the degree of change in the traveling direction of the image light LP3a becomes smaller than when the rotation angle θ is 0 [°], and the degree of change in the traveling direction of the image light LP3b becomes larger than when the rotation angle θ is 0 [°]. Therefore, the image light LP3a is emitted from the optical element 60 as image light LS3c whose traveling direction does not change or whose degree of change in the traveling direction is small. The image light LP3b is emitted from the optical element 60 as image light LS3d that is inclined more downward than when the rotation angle θ is 0 [°]. As a result, when the movable part 370 rotates about the rotation axis R1 upward, the image light LS3 emitted from the optical element 60 is in a state of being spread wider downward than when the rotation angle θ is 0 [°].

[0079] As shown in FIG. 16, when the rotation angle θ of the movable part 370 rotates downward about the rotation axis R1, the degree of change in the traveling direction of the image light LP3a becomes larger than when the rotation angle θ is 0 [°], and the degree of change in the traveling direction of the image light LP3b becomes smaller than when the rotation angle θ is 0 [°]. Therefore, the image light LP3b is emitted from the optical element 60 as the image light LS3f whose traveling direction does not change or the degree of change in the traveling direction is small. The image light LP3a is emitted from the optical element 60 as the image light LS3e that is tilted more upward than when the rotation angle θ is 0 [°]. As a result, when the movable part 370 rotates downward about the rotation axis R1, the image light LS3 emitted from the optical element 60 is in a state of being spread more upward than when the rotation angle θ is 0 [°]. Other configurations of the projection system 300 are the same as those of the projection system 100 in the first embodiment.

[0080] According to the present embodiment, in the same manner as in the first embodiment, the traveling direction of the light projected from the projection optical device 306 can be changed by the adjustment mechanism 330. Thereby, while suppressing an increase in the size of the projection system 300, the light emitted from the projection optical device 306 can be easily projected to a desired location.

[0081] Also, according to the present embodiment, the image light LP3 projected from the projection optical device 306 is projected in a direction that is not offset in the vertical direction (second direction) Z that is orthogonal to both the optical axis AXP of the projection optical device 306 and the left - right direction (first direction) Y with respect to the optical axis AXP of the projection optical device 306. The movable part 370 is relatively rotatable about the rotation axis R1 toward the upper side (first side in the second direction) and the lower side (second side in the second direction) with respect to the projection optical device 306. Therefore, by changing the direction of rotating the movable part 370, as described above, it is possible to spread the image light LS3 emitted from the optical element 60 to both sides in the vertical direction Z. Therefore, the light emitted from the projection optical device 306 can be more easily projected to a desired location.

[0082] <Fourth Embodiment> In this embodiment, the location where the projection system 400 is installed is different from that in the first embodiment. FIG. 17 is a diagram showing the projection system 400 in this embodiment. In this embodiment, the left - right direction Y corresponds to the "first direction", the front - rear direction X corresponds to the "second direction", and the rear side corresponds to the "first side in the second direction".

[0083] As shown in FIG. 17, the projection system 400 in this embodiment is attached to the side wall surface W1. More specifically, the housing 25 of the projector 401 is attached to the side wall surface W1. The projection system 400 has the same structure as the projection system 100 of the first embodiment, except that the front legs 26a and the rear legs 26b are not provided. The projection system 400 is attached to the side wall surface W1 in a state where it is rotated 90° around an axis extending in the left - right direction Y with respect to the projection system 100 of the first embodiment.

[0084] The projection system 400 includes a projector 401 and an adjustment mechanism 430. The projection optical device 406 of the projector 401 emits image light upward. In this embodiment, the image light emitted from the projection optical device 406 is offset to the rear side. The adjustment mechanism 430 is located above the projection optical device 406. The image light LS4 emitted from the adjustment mechanism 430 is projected onto the ceiling surface W3. The ceiling surface W3 is a surface facing downward. In this embodiment, the image light LS4 emitted from the projection system 400 has its traveling direction changed forward by the rotation of the movable part 470 in the adjustment mechanism 430 around the rotation axis R2 toward the rear side, and is projected onto the two surfaces of the side wall surface W1 and the ceiling surface W3. The rotation axis R2 is a virtual axis extending in the left - right direction Y. Other configurations of the projection system 400 are the same as those of the projection system 100 in the first embodiment.

[0085] According to the present embodiment, in the same manner as in the above-described embodiment, it is possible to easily project the light emitted from the projection optical device 406 to a desired location while suppressing an increase in the size of the projection system 400.

[0086] Embodiments of the present disclosure are not limited to the above-described embodiments, and the following configurations and methods can also be adopted. The adjustment mechanism may have a movable part provided so as to be relatively movable with respect to the projection optical device, and as long as the movable part can change the traveling direction of the light projected from the projection optical device by relatively moving with respect to the projection optical device, any structure may be used. When the movable part has an optical element, the optical element may be any type of optical element. When the optical element is an optical element that widens the angle of view of the light projected from the projection optical device, the optical element may be a fisheye lens. In this case, since the angle of view of the light projected from the projection optical device can be widened to about 180°, it is possible to project light onto a plurality of surfaces without adjusting the movable part in the adjustment mechanism. The optical element may be an optical element that narrows the angle of view of the light projected from the projection optical device. In this case, it is possible to easily project light onto a plurality of surfaces arranged at a relatively distant position from the projection system. The optical element may be a mirror that reflects light.

[0087] The movable part of the adjustment mechanism only needs to be provided so as to be relatively movable with respect to the projection optical device, and may move relative to the projection optical device in any manner. The movable part may be provided so as to be slidable with respect to the projection optical device. When the movable part is rotatable about a rotation axis with respect to the projection optical device, the first direction in which the rotation axis extends is not particularly limited as long as it is a direction orthogonal to the optical axis of the projection optical device. The first direction may be the vertical direction Z in the first embodiment described above. In this case, the traveling direction of the light projected from the projection optical device can be adjusted in the left-right direction Y. The adjustment mechanism may be a part of the projector. In this case, at least a part of the adjustment mechanism may be housed in the housing of the projector.

[0088] In the above-described first embodiment, an example of applying the present disclosure to a transmissive projector has been described. However, the present disclosure can also be applied to a reflective projector. Here, "transmissive" means a type in which a light modulation device including a liquid crystal panel or the like transmits light. "Reflective" means a type in which the light modulation device reflects light. Note that the light modulation device is not limited to a liquid crystal panel or the like, and may be, for example, a light modulation device using a micromirror.

[0089] Further, in the above-described first embodiment, an example of the projector 1 using three light modulation devices 4R, 4G, and 4B has been given. However, the present disclosure is also applicable to a projector using only one light modulation device and a projector using four or more light modulation devices. In addition, each configuration and each method described in this specification can be appropriately combined within a range that does not conflict with each other.

[0090] [Summary of the Present Disclosure] Hereinafter, a summary of the present disclosure is appended.

[0091] (Appended Note 1) A light source that emits light, A light modulation device that modulates the light emitted from the light source, A projection optical device that projects the light modulated by the light modulation device, An adjustment mechanism disposed on the side where light is projected from the projection optical device with respect to the projection optical device, Comprising The adjustment mechanism has a movable part provided so as to be relatively movable with respect to the projection optical device, and by the relative movement of the movable part with respect to the projection optical device, the traveling direction of the light projected from the projection optical device is changed. A projection system characterized by that.

[0092] According to this configuration, without providing a mechanism for moving the projection optical device in the projector, the traveling direction of the light projected from the projection optical device can be changed by the adjustment mechanism. Thereby, while suppressing the enlargement of the projection system, the light projected from the projection optical device can be easily projected to a desired location.

[0093] (Appendix 2) The projection system according to Appendix 1, wherein the movable part has an optical element on which the light projected from the projection optical device is incident.

[0094] According to this configuration, the traveling direction of the light projected from the projection optical device can be easily changed by the optical element.

[0095] (Appendix 3) The projection system according to Appendix 2, wherein the optical element is an optical element that widens the angular field of view of the light projected from the projection optical device.

[0096] According to this configuration, the light projected from the projection system can be more easily projected to a desired location. In particular, when the light projected from the projection optical device is projected in a direction offset with respect to the optical axis of the projection optical device, the light projected from the projection optical device is difficult to be projected onto the installation surface on which the projection system is installed. However, by widening the angular field of view of the light projected from the projection optical device by the optical element, the rotation angle of the movable part can be adjusted to change the traveling direction of the light projected from the projection optical device toward the side facing the installation surface. Thereby, the light projected from the projection optical device can also be easily projected onto the installation surface on which the projection system is installed.

[0097] (Appendix 4) The movable part has a holding part that holds the optical element, The holding part has a first holding member and a second holding member that sandwich the optical element in the direction in which the optical axis of the optical element extends, The projection system according to appendix 2 or appendix 3, wherein the first holding member and the second holding member are fixed to each other.

[0098] According to this configuration, the optical element can be easily and stably held by the holding portion. Further, a filter or the like can be disposed on the light emission side of the optical element, and the filter and the optical element can be held together by being sandwiched between the first holding member and the second holding member. Thereby, it is also possible to easily adjust the light emitted from the optical element by the filter.

[0099] (Appendix 5) A first fixing hole through which a screw member for fixing the second holding member to the first holding member can pass is formed in the second holding member. The projection system according to appendix 4, wherein at least one of the following conditions is satisfied: a second fixing hole is formed in the second holding member side by side with the first fixing hole in the direction in which the optical axis of the optical element extends; and the first fixing hole is a long hole in the direction in which the optical axis of the optical element extends.

[0100] According to this configuration, the distance between the first holding member and the second holding member can be changed by changing the fixing hole through which the screw member passes between the first fixing hole and the second fixing hole, or by changing the position where the screw member passes within the first fixing hole. Thereby, a plurality of types of optical elements having different dimensions in the direction in which the optical axis extends can be held by being sandwiched between the first holding member and the second holding member.

[0101] (Appendix 6) The projection system according to any one of appendices 1 to 5, wherein the movable portion is rotatable about a rotation axis extending in a first direction orthogonal to the optical axis of the projection optical device with respect to the projection optical device.

[0102] According to this configuration, by rotating the movable portion about the rotation axis, the traveling direction of the light projected from the projection optical device can be easily changed.

[0103] (Appendix 7) The light projected from the projection optical device is projected in a direction offset to the first side in a second direction that is orthogonal to both the optical axis of the projection optical device and the first direction with respect to the optical axis of the projection optical device. The movable part is rotatable relative to the projection optical device about the rotation axis toward the first side, and the projection system according to Appendix 6.

[0104] According to this configuration, the optical element can be an optical element capable of expanding the angle of view, and by rotating it about the rotation axis toward the first side, the traveling direction of the light offset to the first side can be changed to the second side opposite to the first side. Thereby, it becomes possible to easily project the light emitted from the projection system onto the installation surface on which the projection system is installed.

[0105] (Appendix 8) The light projected from the projection optical device is projected in a direction not offset in a second direction that is orthogonal to both the optical axis of the projection optical device and the first direction with respect to the optical axis of the projection optical device. The movable part is rotatable relative to the projection optical device about the rotation axis toward each of the first side and the second side in the second direction, and the projection system according to Appendix 6.

[0106] According to this configuration, by changing the direction of rotation of the movable part, it is possible to expand the light emitted from the optical element to each of both sides in the second direction. Therefore, it is easier to project the light emitted from the projection optical device to a more desired location.

[0107] (Appendix 9) It includes a housing that houses the light source and the light modulation device inside. The adjustment mechanism has a fixing member fixed to the housing. On the fixing member, a support hole through which the rotation axis passes, and A guide hole is arranged radially away from the support hole around the rotation axis and extends in the circumferential direction around the rotation axis. is formed, The movable part is attached to the fixed part by a first screw member passing through the support hole and a second screw member passing through the guide hole, and the projection system according to any one of Appendices 6 to 8.

[0108] According to this configuration, by loosening the first screw member and the second screw member, the movable part can be rotated around the rotation axis within the range where the second screw member can relatively move in the guide hole. Further, after setting the rotation angle of the movable part to a desired angle, by tightening the first screw member and the second screw member, the rotation angle of the movable part can be held at the desired angle. Therefore, the rotation angle of the movable part can be easily adjusted, and the traveling direction of the light projected from the projection system can be easily adjusted by the adjustment mechanism.

[0109] (Appendix 10) An adjustment mechanism attached to a projector including a light source that emits light, a light modulation device that modulates the light emitted from the light source, and a projection optical device that projects the light modulated by the light modulation device, comprising a movable part provided so as to be relatively movable with respect to the projection optical device, The adjustment mechanism is arranged on the side where light is projected from the projection optical device with respect to the projection optical device, The adjustment mechanism is characterized in that, by the relative movement of the movable part with respect to the projection optical device, the traveling direction of the light projected from the projection optical device is changed.

[0110] According to this configuration, without changing the structure of the projector, by attaching the adjustment mechanism to the projector, the traveling direction of the light projected from the projection optical device of the projector can be changed by the adjustment mechanism.

Explanation of Signs

[0111] 1,201,301,401… Projector, 2… Light source, 4B, 4G, 4R… Light modulation device, 6, 206, 306, 406… Projection optical device, 25… Housing, 30, 130, 330, 430… Adjustment mechanism, 40, 340… Fixed member, 43a… Support hole, 43b, 343b… Guide hole, 50… Holding part, 51… First holding member, 52… Second holding member, 57a, 157… First fixing hole, 57b… Second fixing hole, 60, 160… Optical element, 70, 370, 470… Movable part, 72… Screw member, 73a… First screw member, 73b… Second screw member, 100, 200, 300, 400… Projection system, AXP, AXS… Optical axis, R1, R2… Axis of rotation, X… Front-rear direction (second direction), Y… Left-right direction (first direction), Z… Vertical direction (second direction)

Claims

1. A light source that emits light, An optical modulation device that modulates the light emitted from the light source, A projection optical device that projects the light modulated by the optical modulation device, An adjustment mechanism disposed on the side where light is projected from the projection optical device with respect to the projection optical device, Comprising, The adjustment mechanism has a movable part provided so as to be relatively movable with respect to the projection optical device, and by the relative movement of the movable part with respect to the projection optical device, the traveling direction of the light projected from the projection optical device is changed. A projection system characterized by that.

2. The projection system according to claim 1, wherein the movable part has an optical element on which the light projected from the projection optical device is incident.

3. The projection system according to claim 2, wherein the optical element is an optical element that expands the angular field of view of the light projected from the projection optical device.

4. The movable part has a holding part that holds the optical element, The holding part has a first holding member and a second holding member that sandwich the optical element in a direction in which the optical axis of the optical element extends, The projection system according to claim 2, wherein the first holding member and the second holding member are fixed to each other.

5. A first fixing hole through which a screw member for fixing the second holding member to the first holding member can pass is formed in the second holding member, At least one of the following is satisfied: a second fixing hole is formed in the second holding member in a direction in which the optical axis of the optical element extends and is aligned with the first fixing hole; the first fixing hole is a long hole in a direction in which the optical axis of the optical element extends. The projection system according to claim 4.

6. The projection system according to claim 1, wherein the movable part is rotatable about a rotation axis extending in a first direction orthogonal to the optical axis of the projection optical device with respect to the projection optical device.

7. The light projected from the projection optical device is projected in a direction offset to the first side in a second direction orthogonal to both the optical axis of the projection optical device and the first direction with respect to the optical axis of the projection optical device, The projection system according to claim 6, wherein the movable part is relatively rotatable about the rotation axis toward the first side with respect to the projection optical device.

8. The light projected from the projection optical device is projected in a direction that is not offset in a second direction that is orthogonal to both the optical axis of the projection optical device and the first direction with respect to the optical axis of the projection optical device. The projection system according to claim 6, wherein the movable part is relatively rotatable about the rotation axis toward each of a first side in the second direction and a second side in the second direction with respect to the projection optical device.

9. Comprising a housing that houses the light source and the light modulation device therein. The adjustment mechanism has a fixing member fixed to the housing. On the fixing member, A support hole through which the rotation axis passes, A guide hole that is arranged radially away from the support hole around the rotation axis and extends in the circumferential direction around the rotation axis, Are formed, The projection system according to any one of claims 6 to 8, wherein the movable part is attached to the fixing member by a first screw member passing through the support hole and a second screw member passing through the guide hole.

10. An adjustment mechanism attached to a projector comprising a light source that emits light, a light modulation device that modulates the light emitted from the light source, and a projection optical device that projects the light modulated by the light modulation device, Comprising a movable part provided so as to be relatively movable with respect to the projection optical device, The adjustment mechanism is arranged on the side from which light is projected from the projection optical device with respect to the projection optical device, The adjustment mechanism is characterized in that the traveling direction of the light projected from the projection optical device is changed by relative movement of the movable part with respect to the projection optical device.

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