Projection system

Abstract

To enhance operability in rotating a projector in a configuration rotatably supporting the projector.SOLUTION: A projection system includes a projector, a stand supporting the projector, a hinge unit connecting the projector and the stand and wiring connected to a circuit board of the projector. The projector includes a projection lens, and is rotatable relatively to the stand centering a rotational axis intersecting an optical axis. The stand includes: a stand frame connected to the hinge unit; and a stand base configured to support the weight of the projector and the stand frame. The stand base includes a connection terminal to be connected to an outside. The wiring reaches the stand base via a projector, a hinge unit and a stand frame. The hinge unit hinders a rotation of the projector relative to the stand.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a projection system. [Background technology]

[0002] Among conventional projectors that project images, there are known ones that have a projector support base that rotatably supports the projector (see, for example, Patent Document 1). This type of projector allows the user to freely adjust the direction of the image light projected by the projector. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-027369 Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, projectors are equipped with operation buttons operated by the user and connection terminals for connecting cables that supply images to the projector. However, in configurations where the connection terminals are located on the projector body or where wiring cables are installed so that they extend from the inside to the outside of the projector, the cables connected to the connection terminals tend to get in the way when rotating the projector. For this reason, users must be careful of the cables when rotating the projector. [Means for solving the problem]

[0005] One aspect of the present disclosure is a projection system comprising: a projector; a stand supporting the projector; a hinge unit connected to the projector and the stand, connecting the projector and the stand; and wiring electrically connected to a circuit board of the projector, wherein the projector has a projection lens, and the projector is rotatable relative to the stand around a rotation axis that intersects with the optical axis, the stand includes a stand frame connected to the hinge unit, and a stand base connected to the stand frame and supporting the weight of the projector and the stand frame when the projection system is installed, the stand base has a connection terminal that can transmit or be electrically connected to the outside, the wiring passes from inside the projector through inside the hinge unit and inside the stand frame to reach inside the stand base and is electrically connected to the connection terminal, and the hinge unit suppresses rotation of the projector relative to the stand. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a perspective view of a projection system according to a first embodiment. [Figure 2] FIG. 1 is a side view of a projection system. [Figure 3] FIG. 1 is a perspective view of a projection system. [Figure 4] FIG. [Figure 5] VV cross section of Figure 3. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] IX-IX cross section of Figure 1. [Figure 10] FIG. 10 is a perspective view of a hinge unit according to a second embodiment. [Figure 11]FIG. 11 is an exploded perspective view of a hinge unit according to a third embodiment. [Figure 12] FIG. 11 is a perspective view of a hinge unit according to a third embodiment. [Figure 13] FIG. 11 is an exploded perspective view of a hinge unit according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0007] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In each drawing, arrows indicate directions in an installed state of the projection system 1. The symbol UP indicates upward, the symbol FR indicates forward, and the symbol R indicates right. Although not shown, the opposite direction of the symbol UP indicates downward, the opposite direction of the symbol FR indicates backward, and the opposite direction of the symbol R indicates left. In the description, directions such as front, back, left, right, and up and down are based on the projection system 1 in FIG. 1 unless otherwise specified.

[0008] [1. Embodiment 1] [1-1.Configuration] [1-1-1. Projection system configuration] Fig. 1 is a perspective view of a projection system 1 according to a first embodiment of the present disclosure, as viewed from above and front on the left side of the projection system 1. Fig. 2 is a side view of the projection system 1. Fig. 3 is a perspective view of the projection system 1, as viewed from below and rear on the right side of the projection system 1.

[0009] The projection system 1 includes a projector 10 that projects an image and a stand 20 that supports the projector 10.

[0010] The projector 10 has a housing with a substantially rectangular parallelepiped shape. A projection lens 11 that projects image light is provided on the front surface of the projector 10. FIG. 1 shows an optical axis OA of the image light that the projection lens 11 projects onto a projection surface. The optical axis OA is the central axis of the projected image, and is, for example, a virtual axis that passes through the optical center of the projection lens 11. In FIG. 1, the image of the projector 10 is projected forward, and the optical axis OA is horizontal with the installation surface M of the projection system 1. Connection holes 10a for connecting a stand 20 are provided on the right side surface 10R and left side surface 10L of the projector 10. The right side surface 10R corresponds to an example of a first side surface. The left side surface 10L corresponds to an example of a second side surface.

[0011] The stand 20 comprises a substantially disc-shaped stand base 30 and a stand frame 50 extending rearward and upward from the side of the stand base 30. Ends of the stand frame 50 are connected to connection holes 10a provided on the left and right sides of the projector 10. In this way, the stand 20 supports the projector 10 from the left and right. The projector 10 is held by the stand 20 in a state where it is suspended above the installation surface M.

[0012] [1-1-2. Stand base configuration] Fig. 4 is an exploded perspective view of the stand base 30. Fig. 5 is a cross-sectional view taken along line VV of Fig. 3 . The stand base 30 is composed of a stand cover 31, a rotary table 36, and a fixing member 40.

[0013] In this embodiment, the stand cover 31 is composed of an upper plate portion 31A and a side plate portion 31B. The overall shape of the stand cover 31 is a disk shape. The stand cover 31 has a thickness that allows it to accommodate a connecting member 33 (described later) and the like.

[0014] Inside the stand cover 31, a guide member 32 and a connecting member 33 are arranged. The connection member 33 holds a connection terminal, and can be connected to the power supply wiring 21 located outside the stand cover 31 from the side plate portion 31B. Inside the stand cover 31, a first rotation restricting portion 34 is provided.

[0015] The upper plate portion 31A forms the upper surface of the stand base 30. As shown in Fig. 2, the upper surface of the stand base 30 is an inclined surface that slopes downward from the front to the rear end of the projection system 1 so that the height from the installation surface of the projection system 1 decreases.

[0016] 4, a plurality of joining holes 31c are provided in the center of the upper plate portion 31A, into which wood screws or taps can be screwed.

[0017] The side plate portion 31B is provided with a notch 31d. The stand frame 50 is inserted into the notch 31d, and the stand base 30 and the stand frame 50 are fixed together with connecting members such as screws and bolts.

[0018] The turntable 36 is a circular, flat member overall, and has a fixing hole 38 opening at the center of the turntable 36. The outer diameter of the turntable 36 is formed to be approximately the same as the inner diameter of the stand cover 31. The turntable 36 is fitted inside the stand cover 31 and fixed to the stand cover 31, and forms the underside of the stand base 30.

[0019] A plurality of rubber feet 37 are provided on the underside of the rotary table 36, that is, on the surface facing the installation surface of the projection system 1.

[0020] The fixing hole 38 is a hole whose diameter varies in the thickness direction of the turntable 36, with the upper diameter being smaller than the lower diameter. That is, the fixing hole 38 has a shape in which the hook portion 38A protrudes toward the center of the fixing hole 38.

[0021] A guide groove 36a is provided on the upper surface of the rotary table 36. The guide groove 36a and the guide member 32 of the stand cover 31 engage with each other, so that the stand base 30 has a rotation structure in which the stand cover 31 rotates while the rotary table 36 is fixed. A second rotation restricting portion (not shown) is provided on the upper surface of the rotary table 36.

[0022] The fixing member 40 is a flat, annular member formed with approximately the same diameter as the fixing hole 38. The fixing member 40 is fitted into the fixing hole 38 from the underside of the turntable 36 and fixed to the turntable 36. The outer diameter of the fixing member 40 is such that it does not pass through the hook portion 38A, so the fixing member 40 can be fixed at a position where it abuts against the hook portion 38A. A round hole 40a and multiple joining holes 40b are provided in the center of the fixing member 40.

[0023] The round holes 40a and the joining holes 40b are provided at positions corresponding to the joining holes 31c of the stand cover 31. The stand cover 31 and the fixed member 40 are joined by inserting joining members such as screws or bolts into the joining holes 31c, the fixing holes 38, and the joining holes 40b. The rotating table 36 remains sandwiched between the stand cover 31 and the fixed member 40 by having the hook portions 38A supported by the fixed member 40, thereby constituting the stand base 30.

[0024] [1-1-3. Stand frame configuration] FIG. 6 is an exploded perspective view of the stand frame 50. As shown in FIG. As described above, the projection system 1 includes a pair of left and right stand frames 50. Each stand frame 50 is hollow and has a generally L-shape when viewed from the front. The stand frame 50 includes a first arm 50L and a second arm 50R. As shown in FIG. 1 , the first arm 50L extends leftward from a side portion on the front side of the stand base 30, then extends rearward and upward, and is attached to a joint hole 10a provided in the left side portion 10L. The second arm 50R extends rightward from a side portion on the front side of the stand base 30, then extends rearward and upward, and is attached to a joint hole 10a provided in the right side portion 10R. The stand frame 50 is rotatably disposed relative to the projector 10.

[0025] 6, the stand frame 50 has a frame base 51 and a frame cover 52. The frame cover 52 is fixed to the frame base 51. There are no limitations on the structure for fixing the frame base 51 and the frame cover 52, and for example, a structure using connecting members such as bolts, nuts, and rivets, or a fitting structure such as boss fitting can be used.

[0026] A rounded rectangular opening 51a is provided at the top end of the frame base 51. The frame cover 52 is provided in a position that does not block the opening 51a when joined to the frame base 51. A hinge cover 54 is provided in the opening 51a from the outer side in the width direction of the projection system 1, and a hinge unit 100 is disposed in the opening 51a from the inner side in the width direction. The stand frame 50 is rotatably connected to the projector 10 by the hinge unit 100. That is, the projector 10 can be rotated in the up and down direction around a virtual rotation axis formed based on the hinge units 100 provided on the left and right stand frames 50. In this embodiment, the rotation axis and the optical axis OA of the projection lens 11 are formed to be perpendicular to each other. The hinge unit 100 corresponds to an example of a connection portion.

[0027] [1-1-4. Hinge unit configuration] Fig. 7 is a perspective view of the hinge unit 100. Fig. 8 is an exploded perspective view of the hinge unit 100.

[0028] The hinge unit 100 has a shaft 101, a second bracket 105, and a first bracket 110. The hinge unit 100 and the opening 51a of the frame base 51, i.e., the hinge unit 100 and the stand frame 50, are disposed on the vertical rotation axis of the projector 10. As shown in FIG. 2 , the hinge unit 100 is disposed within a range S formed by a radius r from the center point C of the projector 10, where r is one-third of the length W from the center point C to a reference point E in a side view. The reference point E is disposed at one of the outer ends of the side surface of the projector. In this embodiment, the reference point E is disposed so that a line connecting the center point C and the reference point E is horizontal with the installation surface M. In this embodiment, the hinge unit 100 is formed so that the center point C of the projector 10 and the vertical rotation axis of the projector 10 overlap with each other in a side view. This provides a rotation axis near the center of gravity of the projector 10, suppressing rotation of the projector 10 due to its own weight.

[0029] As shown in FIG. 8, the shaft 101 is a substantially cylindrical component and is disposed so as to penetrate the second bracket 105 and the first bracket 110. The shaft 101 is a member that supports the second bracket 105 and the first bracket 110 so that they can rotate relative to each other and serves as the axis of rotation. A protrusion 102, part of which extends radially, is provided at one end of the shaft 101 in the direction along the axis of rotation. As shown in FIG. 7, when the shaft 101 is viewed from above in the direction along the axis of rotation, the protrusion 102 is formed with abutment portions 102a and 102b. In this embodiment, the abutment portion 102a corresponds to an example of a first abutment portion, and the abutment portion 102b corresponds to an example of a third abutment portion.

[0030] The first bracket 110 is fixed to the shaft 101 and the projector 10. As a result, when the projector 10 and the shaft 101 rotate, the first bracket 110 also rotates in conjunction with them.

[0031] The second bracket 105 is fixed to the frame base 51. As shown in FIG. 7, the second bracket 105 has a protruding position restriction portion 106 on one surface facing the stand 20. The position restriction portion 106 is formed with a contact portion 106a that contacts the contact portion 102a and a contact portion 106b that contacts the contact portion 102b when the projector 10 rotates. In this embodiment, two position restriction portions 106 are provided. The contact portion 106a corresponds to an example of the second contact portion. The contact portion 106b corresponds to an example of the fourth contact portion.

[0032] 8, a ring-shaped sliding element 103 and a biasing member 104 are disposed between the first bracket 110 and the second bracket 105. The shaft 101 passes through the sliding element 103 and the biasing member 104. In this embodiment, the sliding element 103 is provided adjacent to the second bracket 105, and the biasing member 104 is provided so as to be sandwiched between the sliding element 103 and the first bracket 110. In this embodiment, the biasing member 104 is a spring washer.

[0033] [1-1-5. Wiring layout for projection systems] 9 is a cross-sectional view taken along line IX-IX in FIG. 1, and is an enlarged view of the main part including the joint between the projector 10 and the stand frame 50. As shown in FIG.

[0034] The projector 10 has a circuit board 12. A first wiring 22 extending from the circuit board 12 of the projector 10 passes through a joint hole 10a on the side surface of the projector 10, passes through a shaft 101 of the hinge unit 100, and is electrically connected to a second wiring 23 inside the stand frame 50. The second wiring 23 passes through the stand frame 50, extends to the stand base 30, and is electrically connected to a connection terminal held by a connection member 33. The connection terminal held by the connection member 33 is exposed to the outside from a side plate portion 31B of the stand cover 31, and is thereby electrically connected to an external power supply wiring 21. This makes it possible to supply power to the projector 10 without exposing wiring 24 inside the projection system 1, including the first wiring 22 and the second wiring 23, except for the external power supply wiring 21 provided at the connection terminal.

[0035] A protective member 22a that protects the first wiring 22 is wound around the first wiring 22. The protective member 22a is a tape-like or tube-like member that has a smoother surface than the first wiring 22. By wrapping the protective member 22a around the first wiring 22, friction between the first wiring 22 and other members can be reduced. This reduces the possibility that the first wiring 22 will come into contact with other members inside the projector 10 or the hinge unit 100, causing wear on the first wiring 22.

[0036] [1-2. How to use the projection system] [1-2-1. Vertical rotation of the projection system] The projector 10 of the projection system 1 is rotatable around the hinge unit 100 while being supported by the stand frame 50. Furthermore, strong friction is generated between the first bracket 110 and the second bracket 105 due to the elastic force of the biasing member 104 provided on the hinge unit 100, so the projector 10 can be held at any position around the hinge unit 100.

[0037] The worker can rotate the projector 10 and change its orientation by applying force against the frictional force of the hinge unit 100. Here, when the worker stops applying force when the orientation of the projector 10 reaches the angle desired by the worker, the orientation of the projector 10 is maintained by the frictional force of the hinge unit 100.

[0038] By rotating the projector 10, the direction in which the projector 10 projects an image, i.e., the projection angle, can be adjusted and changed. There is a limit to the range in which the projector 10 can rotate around the hinge unit 100, and this range can be said to be the adjustable range of the projection angle of the projector 10.

[0039] The adjustable range of the projection angle of the projector 10 is determined by the abutment portions 102a and 102b of the protrusion 102 provided on the shaft 101 and the abutment portions 106a and 106b of the position regulating portion 106 provided on the second bracket 105. When the projector 10 rotates, the first bracket 110 and the shaft 101 in the hinge unit 100 rotate in conjunction with the projector 10. When the abutment portion 102a of the shaft 101 and the abutment portion 106a of the second bracket 105 come into contact with each other, the projector 10 cannot be rotated any further. The same is true when the abutment portions 102b and 106b come into contact with each other. In other words, the projector 10 can be rotated within a range defined by the position where the abutment portion 102a and the abutment portion 106a come into contact with each other and the position where the abutment portion 102b and the abutment portion 106b come into contact with each other. The projection angle of projector 10 at either the position where contact portion 102a and contact portion 106a come into contact with each other or the position where contact portion 102b and contact portion 106b come into contact with each other can be called the maximum projection angle, and the other can be called the minimum projection angle.

[0040] In this embodiment, the projection angle of the projector 10 can be changed within a range of 90 degrees clockwise and 90 degrees counterclockwise with respect to an axis perpendicular to the installation surface of the stand base 30. In other words, the projection angle can be adjusted within a range of 180 degrees. In other words, the angle formed by the optical axis OA when the contact portion 102a and the contact portion 106a are in contact with each other and the optical axis OA when the contact portion 102b and the contact portion 106b are in contact with each other is 180 degrees.

[0041] According to this configuration, the projection angle of the projector 10 can be adjusted within a range that is practically necessary and sufficient, while limiting the angle at which the projector 10 rotates, thereby suppressing wear on the hinge unit 100. For example, in the projection system 1 of this embodiment, the projection angle of the projector 10 is limited to a range of 180 degrees centered on the vertical direction. This prevents contact between the front surface of the projector 10 and the stand 20, and prevents image light from being blocked by the installation surface or the stand 20.

[0042] Furthermore, if the projector 10 were able to rotate 360 ​​degrees relative to the stand 20, the first wiring 22 would be pulled, which could damage the circuit board 12. In contrast, by adopting this configuration, the angle at which the projector 10 rotates can be limited, and the possibility of damaging the circuit board 12 can be reduced.

[0043] [1-2-2. Horizontal rotation of the projection system] In the projection system 1, the turntable 36, which contacts the installation surface, is rotatably supported by a fixing member 40. Therefore, with the turntable 36 in contact with the installation surface, the projection system 1 can be rotated horizontally to adjust the projection angle of the projector 10 in the horizontal direction. The rotation range of the turntable 36 is limited to the position where the first rotation restricting portion 34 of the stand cover 31 and the second rotation restricting portion of the turntable 36 abut. This prevents the projection system 1 from rotating indefinitely, thereby reducing wear on each part, including the turntable 36. Furthermore, because the rotation range of the turntable 36 is large enough for practical use, the user can adjust the projection angle of the projector 10 in any direction.

[0044] Furthermore, if the stand cover 31 were able to rotate 360 ​​degrees relative to the turntable 36, the power supply wiring 21 outside the stand cover 31 would be pulled and potentially come off. However, by adopting this configuration, it is possible to prevent the projection system 1 from rotating indefinitely, and reduce the possibility of the power supply wiring 21 coming off.

[0045] [2. Embodiment 2] A description will be given of embodiment 2. In embodiment 2, parts configured in the same manner as in embodiment 1 above will be given the same reference numerals and descriptions thereof will be omitted.

[0046] Fig. 10 is a perspective view of the hinge unit 200. Fig. 11 is an exploded perspective view of the hinge unit 200.

[0047] In the first embodiment, the protrusion 102 is formed on the shaft 101. In addition, the position restricting portion 106 is formed on the second bracket 105. The rotation range of the projector 10 is restricted by the abutment portions 102a and 106a formed by the protrusion 102 and the position restricting portion 106 abutting against each other, and the abutment portions 102b and 106b abutting against each other.

[0048] In the second embodiment, in the hinge unit 200, a position restriction portion 211 is provided on a first bracket 210, and abutment portions 211a and 211b are formed. A protrusion 206 is provided on a second bracket 205, and abutment portions 206a and 206b are formed. The abutment portion 206a abuts against the abutment portion 211a. The abutment portion 206b abuts against the abutment portion 211b. That is, the projector 10 is rotatable within a range of both limits, with the limits being the position where the abutment portion 206a abuts against the abutment portion 211a and the position where the abutment portion 206b abuts against the abutment portion 211b. The abutment portion 206a corresponds to an example of a second abutment portion. The abutment portion 206b corresponds to an example of a fourth abutment portion. The abutment portion 211a corresponds to an example of a first abutment portion. The contact portion 211b corresponds to an example of a third contact portion.

[0049] The first bracket 210 is fixed to the projector 10 .

[0050] 11 , the shaft 201 has a bearing portion 201a in the middle of which part is larger in the radial direction. A first bracket 210 and a second bracket 205 are disposed on both ends of the bearing portion 201a. The second bracket 205 is fixed to the shaft 201. A sliding element 203 is disposed adjacent to the second bracket 205 on the stand frame 50 side. A biasing member 204 is disposed adjacent to the sliding element 203. A positioning member 208 is disposed adjacent to the biasing member 204. That is, the sliding element 203, the biasing member 204, and the positioning member 208 are provided between the frame base 51 and the second bracket 205.

[0051] The positioning member 208 is a member that restricts the first bracket 210 and the like from being pushed outward in the width direction by the biasing member 204. In this embodiment, the biasing member 204 is a spring washer.

[0052] 3. Embodiment 3 A description will now be given of embodiment 3. In embodiment 3, parts configured in the same manner as in embodiments 1 and 2 above will be given the same reference numerals and descriptions thereof will be omitted.

[0053] Fig. 12 is a perspective view of the hinge unit 300. Fig. 13 is an exploded perspective view of the hinge unit 300.

[0054] In the second embodiment, the sliding member 203, the biasing member 204, and the positioning member 208 are arranged on the stand frame 50 side of the second bracket 205.

[0055] In the hinge unit 300 of the third embodiment, a generally C-shaped biasing member 304 is disposed so as to be sandwiched between a first bracket 310 and a second bracket 305. The shaft 301 is tightened by the biasing member 304, thereby preventing free rotation. In this embodiment, the biasing member 304 is a spring washer.

[0056] The second bracket 305 is connected to the stand 20. The first bracket 310 is connected to the projector 10. The shaft 301 is fixed to the first bracket 310 and is provided so as to be rotatable relative to the second bracket 305.

[0057] As shown in FIG. 13 , in the hinge unit 300 of the third embodiment, a position restricting portion 311 is provided on a first bracket 315, and abutment portions 311a and 311b are formed. A protrusion 306 is provided on a second bracket 305, and abutment portions 306a and 306b are formed. The abutment portion 306a abuts against the abutment portion 311a. The abutment portion 306b abuts against the abutment portion 311b. That is, the projector 10 is rotatable within a range of limits defined by the position where the abutment portion 306a abuts against the abutment portion 311a and the position where the abutment portion 306b abuts against the abutment portion 311b. The abutment portion 306a corresponds to an example of a second abutment portion. The abutment portion 306b corresponds to an example of a fourth abutment portion. The abutment portion 311a corresponds to an example of a first abutment portion. The contact portion 311b corresponds to an example of a third contact portion.

[0058] 4. Other Embodiments The above-described embodiments merely show one mode in which the present disclosure is applied, and any modifications and applications are possible without departing from the spirit of the present disclosure.

[0059] In each of the above-described embodiments, the positions of the biasing members 104, 204, 304 and the first brackets 110, 210, 310 and second brackets 105, 205, 305 fixed to the shafts 101, 201, 301 can be changed as needed. Furthermore, the shafts 101, 201, 301, first brackets 110, 210, 310 and second brackets 105, 205, 305 on which the protrusions 102, 206, 306 and the position restriction portions 111, 211, 311 are provided can also be changed. Whether the first bracket 110, 210, 310 or the second bracket 105, 205, 305 is formed to be rotatable may be changed depending on the arrangement of each member.

[0060] In the first embodiment, as in the second and third embodiments, the rotation angle can also be restricted by providing the protrusion 102 on either the second bracket 105 or the first bracket 110, instead of the shaft 101, and by providing the position restriction portion 111 on the other bracket. Also, in the second and third embodiments, the adjustable range of the projection angle can be restricted by providing the protrusions 206 and 306 on the shafts 201 and 301, and by providing the position restriction portions 211 and 311 on the second brackets 205 and 305 or the first brackets 210 and 310.

[0061] In the first embodiment, the angle formed by the optical axis OA when the contact portion 102a and the contact portion 106a are in contact with each other is 180 degrees, and the angle formed by the optical axis OA when the contact portion 102b and the contact portion 106b are in contact with each other is 180 degrees. However, in the projection system 1 of the present disclosure, the angle formed by the optical axis OA when the contact portion 102a, 211a, 311a and the contact portion 106a, 206a, 306a are in contact with each other and the angle formed by the optical axis OA when the contact portion 102b, 211b, 311b and the contact portion 106b, 206b, 306b are in contact with each other can be changed within 180 degrees.

[0062] The angle formed by the optical axis OA and the vertical axis of the projection system 1 when the abutment portion 102a and the abutment portion 106a are in contact with each other is 90 degrees, and the angle formed by the optical axis OA and the vertical axis of the projection system 1 when the abutment portion 102b and the abutment portion 106b are in contact with each other is 90 degrees. However, in the projection system 1 of the present disclosure, the angle formed by the optical axis OA and the vertical axis when the abutment portion 102a, 211a, 311a and the abutment portion 106a, 206a, 306a are in contact with each other can be changed within 120 degrees. Furthermore, the angle formed by the optical axis OA and the vertical axis when the contact portions 102b, 211b, 311b and the contact portions 106b, 206b, 306b are in contact with each other can be changed within 120 degrees.

[0063] In the embodiment described above, the rotary table 36 may be configured to rotate 360 ​​degrees relative to the stand base 30, or may be configured to rotate within a predetermined range.

[0064] 5. Summary of this Disclosure A summary of this disclosure is provided below.

[0065] (Supplementary Note 1) A projection system comprising: a projector; a stand supporting the projector; a hinge unit connected to the projector and the stand, connecting the projector and the stand; and wiring electrically connected to a circuit board of the projector, wherein the projector has a projection lens, and the projector is rotatable relative to the stand around a rotation axis that intersects with an optical axis of the projection lens, and the stand includes: a stand frame connected to the hinge unit, and a stand base connected to the stand frame and supporting the weight of the projector and the stand frame when the projection system is installed, the stand base having a connection terminal that can transmit or be electrically connected to the outside, the wiring passing from inside the projector through inside the hinge unit and inside the stand frame to reach the inside of the stand base and being electrically connected to the connection terminal, and the hinge unit suppresses rotation of the projector relative to the stand. As a result, even if the projector is configured so that the wiring reaches the inside of the stand base from inside the projector and is rotatable relative to the stand, the hinge restricts the projector from rotating relative to the stand, thereby preventing the projector from rotating relative to the stand. Therefore, the user does not need to be careful about damaging the wiring when rotating the projector, and operability when rotating the projector can be improved.

[0066] (Appendix 2) The projection system described in Appendix 1, wherein the hinge unit includes a first bracket connected to the projector, a second bracket connected to the stand, a biasing member located between the first bracket and the second bracket, and a shaft supporting the first bracket, the second bracket, and the biasing member, wherein either the first bracket or the second bracket is arranged rotatably about the shaft, the biasing member biases the second bracket along the shaft in a direction from the first bracket to the second bracket, or in a direction from the second bracket to the first bracket, and the wiring passes through the inside of the shaft. As a result, the elastic force of the biasing member generates a force that moves the first bracket relatively away from the second bracket. Therefore, when the first bracket rotates relatively to the second bracket, a frictional force is generated by the elastic force, suppressing free rotation. This prevents the projector from rotating relative to the stand. Therefore, there is no need to be careful about damaging the wiring when rotating the projector, and operability when rotating the projector can be improved.

[0067] (Appendix 3) The projection system described in Appendix 2, wherein the shaft is connected to the first bracket and is arranged to be rotatable relative to the second bracket, a first abutment portion is formed on the shaft and a second abutment portion is formed on the second bracket, and when the shaft rotates relative to the second bracket, the first abutment portion abuts against the second abutment portion, thereby preventing rotation of the shaft relative to the second bracket. This prevents the projector from rotating more than a predetermined amount relative to the stand, eliminating the need to be careful about damaging the wiring when rotating the projector, and improving operability when rotating the projector.

[0068] (Appendix 4) A projection system as described in Appendix 2, wherein the shaft is connected to the second bracket and is arranged to be rotatable relative to the first bracket, a first abutment portion is formed on the shaft and a second abutment portion is formed on the first bracket, and when the shaft rotates relative to the first bracket, the first abutment portion abuts against the second abutment portion, thereby preventing rotation of the shaft relative to the first bracket. This prevents the projector from rotating more than a predetermined amount relative to the stand, eliminating the need to be careful about damaging the wiring when rotating the projector, and improving operability when rotating the projector.

[0069] (Appendix 5) A projection system as described in Appendix 2, wherein the shaft is connected to the first bracket and is arranged to be rotatable relative to the second bracket, a first abutment portion is formed on the first bracket, and a second abutment portion is formed on the second bracket, and when the first bracket rotates relative to the second bracket, the first abutment portion abuts against the second abutment portion, thereby preventing rotation of the first bracket relative to the second bracket. This prevents the projector from rotating more than a predetermined amount relative to the stand, eliminating the need to be careful about damaging the wiring when rotating the projector, and improving operability when rotating the projector.

[0070] (Appendix 6) The projection system described in Appendix 1, wherein the hinge unit includes a first bracket connected to the projector, a second bracket connected to the stand, a biasing member that biases the first bracket or the second bracket, and a shaft that supports the first bracket, the second bracket, and the biasing member, wherein either the first bracket or the second bracket is arranged to be rotatable about the shaft, wherein when the biasing member biases the first bracket toward the second bracket, the biasing member, the first bracket, and the second bracket are arranged in order along the shaft, and when the biasing member biases the second bracket toward the first bracket, the biasing member, the second bracket, and the first bracket are arranged in order along the shaft, and the wiring passes through the inside of the shaft. As a result, the elastic force of the biasing member generates a force that moves the first bracket relatively toward the second bracket. Therefore, when the first bracket rotates relatively to the second bracket, the elastic force generates a frictional force that suppresses free rotation. This prevents the projector from rotating relative to the stand. Therefore, there is no need to be careful about damaging the wiring when rotating the projector, and operability when rotating the projector can be improved.

[0071] (Appendix 7) The projection system described in Appendix 6, wherein the shaft is connected to the first bracket and is arranged to be rotatable relative to the second bracket, a first abutment portion is formed on the shaft and a second abutment portion is formed on the second bracket, and when the shaft rotates relative to the second bracket, the first abutment portion abuts against the second abutment portion, thereby preventing rotation of the shaft relative to the second bracket. This prevents the projector from rotating more than a predetermined amount relative to the stand, eliminating the need to be careful about damaging the wiring when rotating the projector, and improving operability when rotating the projector.

[0072] (Appendix 8) The projection system described in Appendix 6, wherein the shaft is connected to the second bracket and is arranged to be rotatable relative to the first bracket, a first abutment portion is formed on the shaft, and a second abutment portion is formed on the first bracket, and when the shaft rotates relative to the first bracket, the first abutment portion abuts against the second abutment portion, thereby preventing rotation of the shaft relative to the first bracket. This prevents the projector from rotating more than a predetermined amount relative to the stand, eliminating the need to be careful about damaging the wiring when rotating the projector, and improving operability when rotating the projector.

[0073] (Appendix 9) The projection system described in Appendix 6, wherein the shaft is connected to the first bracket and arranged to be rotatable relative to the second bracket, a first abutment portion is formed on the first bracket, and a second abutment portion is formed on the second bracket, and when the first bracket rotates relative to the second bracket, the first abutment portion abuts against the second abutment portion, thereby preventing rotation of the first bracket relative to the second bracket. This prevents the projector from rotating more than a predetermined amount relative to the stand, eliminating the need to be careful about damaging the wiring when rotating the projector, and improving operability when rotating the projector.

[0074] (Appendix 10) The projection system described in Appendix 1, wherein the hinge unit includes a first bracket connected to the projector, a second bracket connected to the stand, a biasing member located between the first bracket and the second bracket, and a shaft supporting the first bracket, the second bracket, and the biasing member, wherein one of the first bracket and the second bracket is arranged to be rotatable around the shaft, the biasing member is connected to the one of the first bracket and the second bracket that is not arranged to be rotatable around the shaft, and biases the shaft to hold it down, and the wiring passes through the inside of the shaft. As a result, when the first blanket rotates relative to the second blanket, the shaft rotates. The biasing member biases the shaft to hold it in place, thereby preventing the shaft from rotating freely. This prevents the projector from rotating relative to the stand. Therefore, there is no need to be careful about damaging the wiring when rotating the projector, and operability when rotating the projector 10 can be improved.

[0075] (Appendix 11) A projection system as described in Appendix 10, wherein the shaft is connected to the first bracket and is arranged to be rotatable relative to the second bracket, a first abutment portion is formed on the shaft, and a second abutment portion is formed on the second bracket, and when the shaft rotates relative to the second bracket, the first abutment portion abuts against the second abutment portion, thereby preventing rotation of the shaft relative to the second bracket. This prevents the projector from rotating more than a predetermined amount relative to the stand, eliminating the need to be careful about damaging the wiring when rotating the projector, and improving operability when rotating the projector.

[0076] (Appendix 12) The projection system described in Appendix 10, wherein the shaft is connected to the second bracket and is arranged to be rotatable relative to the first bracket, a first abutment portion is formed on the shaft, and a second abutment portion is formed on the first bracket, and when the shaft rotates relative to the first bracket, the first abutment portion abuts against the second abutment portion, thereby preventing rotation of the shaft relative to the first bracket. This prevents the projector from rotating more than a predetermined amount relative to the stand, eliminating the need to be careful about damaging the wiring when rotating the projector, and improving operability when rotating the projector.

[0077] (Appendix 13) The projection system described in Appendix 10, wherein the shaft is connected to the first bracket and arranged to be rotatable relative to the second bracket, a first abutment portion is formed on the first bracket, and a second abutment portion is formed on the second bracket, and when the first bracket rotates relative to the second bracket, the first abutment portion abuts against the second abutment portion, thereby preventing rotation of the first bracket relative to the second bracket. This prevents the projector from rotating more than a predetermined amount relative to the stand, eliminating the need to be careful about damaging the wiring when rotating the projector, and improving operability when rotating the projector.

[0078] (Appendix 14) A projection system described in any one of Appendices 3, 7, and 11, wherein a third abutment portion is formed on the shaft and a fourth abutment portion is formed on the second bracket, and when the shaft rotates relative to the second bracket, the third abutment portion abuts against the fourth abutment portion, thereby preventing rotation of the shaft relative to the second bracket, and when the projection system is viewed in a plane along the rotation axis, the angle formed between the optical axis when the first abutment portion and the second abutment portion abut about the rotation axis and the optical axis when the third abutment portion and the fourth abutment portion abut is within 180 degrees. This allows the projector to be rotatable relative to the stand. The greater the angle of rotation, the greater the range of movement, and the faster the deterioration of the hinge unit. By limiting the range of movement to within 180 degrees, deterioration of the hinge unit can be suppressed and rotation beyond a certain limit can be prevented. This eliminates the need to be careful about damaging the wiring caused by rotating the projector, and improves operability when rotating the projector.

[0079] (Appendix 15) A projection system as described in Appendix 14, wherein the position at which the first abutment portion and the second abutment portion abut is set so that when the stand base is installed on an installation surface, the angle formed by the optical axis with respect to a virtual axis perpendicular to the installation surface is within 120 degrees. This eliminates the need for the operator to take care to prevent the surface on which the projection lens of the projector is mounted from colliding with the stand, and at the same time, it is possible to prevent the projector from being tilted downward too much, thereby improving operability when rotating the projector.

[0080] (Appendix 16) A projection system described in any one of Appendices 4, 8, and 12, wherein a third abutment portion is formed on the shaft and a fourth abutment portion is formed on the first bracket, and when the shaft rotates relative to the first bracket, the third abutment portion abuts against the fourth abutment portion, thereby preventing the shaft from rotating relative to the first bracket, and when the projection system is viewed in a plane along the rotation axis, the angle formed between the optical axis when the first abutment portion and the second abutment portion abut and the optical axis when the third abutment portion and the fourth abutment portion abut is within 180 degrees, about the rotation axis. This allows the projector to be rotatable relative to the stand. The greater the angle of rotation, the greater the range of movement, and the faster the deterioration of the hinge unit. By limiting the range of movement to within 180 degrees, deterioration of the hinge unit can be suppressed and rotation beyond a certain limit can be prevented. This eliminates the need to be careful about damaging the wiring caused by rotating the projector, and improves operability when rotating the projector.

[0081] (Appendix 17) A projection system as described in Appendix 16, wherein the position at which the first abutment portion and the second abutment portion abut is set so that when the stand base is installed on an installation surface, the angle formed by the optical axis with respect to a virtual axis perpendicular to the installation surface is within 120 degrees. This eliminates the need for the operator to take care to prevent the surface on which the projection lens of the projector is mounted from colliding with the stand, and at the same time, it is possible to prevent the projector from being tilted downward too much, thereby improving operability when rotating the projector.

[0082] (Appendix 18) A projection system described in any one of Appendices 5, 9, and 13, wherein a third abutment portion is formed on the first bracket and a fourth abutment portion is formed on the second bracket, and when the first bracket rotates relative to the second bracket, the third abutment portion abuts against the fourth abutment portion, thereby preventing rotation of the first bracket relative to the second bracket, and when the projection system is viewed in a plane along the rotation axis, the angle formed between the optical axis when the first abutment portion and the second abutment portion abut and the optical axis when the third abutment portion and the fourth abutment portion abut is within 180 degrees, about the rotation axis. This allows the projector to be rotatable relative to the stand. The greater the angle of rotation, the greater the range of movement, and the faster the deterioration of the hinge unit. By limiting the range of movement to within 180 degrees, deterioration of the hinge unit can be suppressed and rotation beyond a certain limit can be prevented. This eliminates the need to be careful about damaging the wiring caused by rotating the projector, and improves operability when rotating the projector.

[0083] (Appendix 19) A projection system as described in Appendix 18, wherein the position at which the first abutment portion and the second abutment portion abut is set so that when the stand base is installed on an installation surface, the angle formed by the optical axis with respect to a virtual axis perpendicular to the installation surface is within 120 degrees. This eliminates the need for the operator to take care to prevent the surface on which the projection lens of the projector is mounted from colliding with the stand, and at the same time, it is possible to prevent the projector from being tilted downward too much, thereby improving operability when rotating the projector.

[0084] (Supplementary Note 20) The projection system according to any one of Supplementary Notes 1 to 13, wherein the wiring is a power supply wiring, and the connection terminal is a power supply terminal. This allows the connection terminal of the stand base to be used as the power terminal, so the power supply wiring does not rotate even when the projector is rotated. This reduces the chance of the power supply wiring becoming disconnected when the worker rotates the projector, improving operability when rotating the projector.

[0085] (Appendix 21) A projection system described in any one of Appendices 1 to 13, wherein the projector has a first side and a second side in a direction perpendicular to the optical axis, the stand frame includes a first arm and a second arm, and the first arm, the hinge unit, the first side, the second arm, and the second side are arranged in this order along the rotation axis. This prevents the projector from rotating relative to the stand by connecting the stand frame to both sides of the projector, which eliminates the need to be careful about damaging the wiring when rotating the projector, and improves operability when rotating the projector.

[0086] (Appendix 22) A projection system as described in Appendix 21, wherein, when the projection system is viewed in a plane in a direction along the rotation axis, the hinge unit is positioned within a range of within one-third of the distance from the center of the first side surface to the outer periphery of the first side surface, as viewed from the center of the first side surface. By positioning the hinge near the center of the side of the projector, the rotation axis can be moved closer to the center of gravity of the projector, which makes it possible to suppress rotation due to the projector's own weight. Therefore, there is no need to be careful about damaging the wiring when rotating the projector, and operability when rotating the projector can be improved.

[0087] (Appendix 23) A projection system described in any one of Appendices 1 to 13, comprising a rotating table that is rotatable relative to the stand base, the rotating table being positioned below the stand base when the projection system is installed, and a holding member that holds the connection terminal being provided on the stand base. As a result, even when the stand base starts to rotate relative to the rotary table, the holding member is located on the stand base side, so the connection terminals and wiring also rotate in conjunction with the stand base, reducing damage to the wiring. Therefore, there is no need to be careful about damaging the wiring when rotating the projector, and operability when rotating the projector can be improved.

[0088] (Appendix 24) A projection system described in any one of Appendices 1 to 13, comprising a rotating table that is rotatable relative to the stand base, the rotating table being positioned below the stand base when the projection system is installed, a first rotation regulating unit being provided on the stand base and a second rotation regulating unit being provided on the rotating table, and the rotation range of the rotating table being regulated by the abutment between the first rotation regulating unit and the second rotation regulating unit. This restricts the rotation range of the stand base even when it starts to rotate relative to the rotary table, reducing the likelihood of the wiring attached to the connection terminal coming loose. This eliminates the need to be careful about damaging the wiring when rotating the projector, improving operability when rotating the projector.

[0089] (Appendix 25) A projection system described in any one of Appendices 1 to 13, including a protective member that protects the wiring, the protective member covering at least the portion of the wiring where the wiring enters from inside the projector into the inside of the hinge unit. As a result, the structure of the inside of the projector and the inside of the hinge unit is different, which can cause unevenness and other issues that can cause the wiring to come into contact with the unevenness and increase friction. Covering these areas with a protective member improves the sliding properties of the wiring and prevents wear. This improves operability when rotating the projector.

[0090] (Appendix 26) A projection system described in any one of Appendices 1 to 13, including a protective member that protects the wiring, wherein the protective member covers at least the portion of the wiring where the wiring enters from inside the hinge unit into the inside of the stand frame. As a result, the structure of the inside of the projector and the inside of the hinge is different, which can cause unevenness and other issues, causing the wiring to come into contact with the unevenness and increase friction. Covering this area with a protective member improves the sliding properties of the wiring and prevents wear. This improves operability when rotating the projector. [Explanation of symbols]

[0091] 1...projection system, 10...projector, 10L...left side surface portion, 10R...right side surface portion, 10a...connection hole, 11...projection lens, 12...circuit board, 20...stand, 21...power supply wiring, 22...first wiring, 22a...protective member, 23...second wiring, 24...wiring, 30...stand base, 31...stand cover, 31A...upper plate portion, 31B...side plate portion, 31c...connection hole, 32...guide member, 33...connection connecting member, 34...first rotation restricting portion, 36...rotary table, 36a...guide groove, 37...rubber foot, 38...fixing hole, 38A...hook portion, 40...fixing member, 40a...round hole, 40b...connecting hole, 50...stand frame, 50L...first arm, 50R...second arm, 51...frame base, 51a...opening, 52...frame cover, 54...hinge cover, 100...hinge unit, 101...shaft, 1 02...protrusion, 102a, 102b...contact portion, 103...sliding part, 104...urging member, 105...second bracket, 106...position restricting portion, 106a, 106b...contact portion, 110...first bracket, 111...position restricting portion, 200...hinge unit, 201...shaft, 201a...bearing portion, 203...sliding part, 204...urging member, 205...second bracket, 206...protrusion, 206a, 206b... Abutment portion, 208...positioning member, 210...first bracket, 211...position restriction portion, 211a, 211b...abutment portion, 300...hinge unit, 301...shaft, 304...urging member, 305...second bracket, 306...protrusion, 306a, 306b...abutment portion, 310...first bracket, 311...position restriction portion, 311a, 311b...abutment portion, 315...first bracket, M...installation surface, OA...optical axis.

Claims

1. 1. A projection system comprising: a projector; a stand that supports the projector; a hinge unit that is connected to the projector and the stand and that connects the projector and the stand; and wiring that is electrically connected to a circuit board of the projector; The projector has a projection lens, the projector is rotatable relative to the stand about a rotation axis that intersects with an optical axis of the projection lens; the stand includes a stand frame connected to the hinge unit, and a stand base connected to the stand frame and supporting the weight of the projector and the stand frame when the projection system is installed; the stand base has a connection terminal capable of transmitting or electrically connecting to an external device; the wiring extends from inside the projector through inside the hinge unit and inside the stand frame to inside the stand base and is electrically connected to the connection terminal; the hinge unit restricts relative rotation of the projector with respect to the stand; Projection system.

2. the hinge unit includes a first bracket connected to the projector, a second bracket connected to the stand, an urging member positioned between the first bracket and the second bracket, and a shaft supporting the first bracket, the second bracket, and the urging member; one of the first bracket and the second bracket is arranged to be rotatable about the shaft; the biasing member biases the second bracket in a direction from the first bracket toward the second bracket along the shaft, or biases the first bracket in a direction from the second bracket toward the first bracket, The wiring passes through the inside of the shaft. The projection system according to claim 1 .

3. the shaft is coupled to the first bracket and is disposed rotatably relative to the second bracket; The shaft is formed with a first abutment portion, The second bracket is formed with a second abutment portion, When the shaft rotates relative to the second bracket, the first contact portion contacts the second contact portion, thereby preventing the shaft from rotating relative to the second bracket. The projection system according to claim 2 .

4. the shaft is connected to the second bracket and is disposed so as to be rotatable relative to the first bracket; a first abutment portion is formed on the shaft; a second abutment portion is formed on the first bracket; When the shaft rotates relative to the first bracket, the first contact portion contacts the second contact portion, thereby preventing the shaft from rotating relative to the first bracket. The projection system according to claim 2 .

5. the shaft is connected to the first bracket and is disposed so as to be rotatable relative to the second bracket; The first bracket is formed with a first abutment portion, The second bracket is formed with a second abutment portion, When the first bracket rotates relative to the second bracket, the first contact portion contacts the second contact portion, thereby preventing the first bracket from rotating relative to the second bracket. The projection system according to claim 2 .

6. the hinge unit includes a first bracket connected to the projector, a second bracket connected to the stand, a biasing member that biases the first bracket or the second bracket, and a shaft that supports the first bracket, the second bracket, and the biasing member; one of the first bracket and the second bracket is arranged to be rotatable about the shaft; When the biasing member biases the first bracket toward the second bracket, the biasing member, the first bracket, and the second bracket are aligned in order along the shaft, when the biasing member biases the second bracket toward the first bracket, the biasing member, the second bracket, and the first bracket are arranged in order along the shaft, The wiring passes through the inside of the shaft. The projection system according to claim 1 .

7. the shaft is coupled to the first bracket and is disposed so as to be rotatable relative to the second bracket; The shaft is formed with a first abutment portion, The second bracket is formed with a second abutment portion, When the shaft rotates relative to the second bracket, the first contact portion contacts the second contact portion, thereby preventing the shaft from rotating relative to the second bracket. The projection system according to claim 6 .

8. the shaft is coupled to the second bracket and is disposed so as to be rotatable relative to the first bracket; The shaft is formed with a first abutment portion, The first bracket is formed with a second abutment portion, When the shaft rotates relative to the first bracket, the first contact portion contacts the second contact portion, thereby preventing the shaft from rotating relative to the first bracket. The projection system according to claim 6 .

9. the shaft is coupled to the first bracket and is disposed so as to be rotatable relative to the second bracket; The first bracket is formed with a first abutment portion, The second bracket is formed with a second abutment portion, When the first bracket rotates relative to the second bracket, the first contact portion contacts the second contact portion, thereby preventing the first bracket from rotating relative to the second bracket. The projection system according to claim 6 .

10. the hinge unit includes a first bracket connected to the projector, a second bracket connected to the stand, an urging member positioned between the first bracket and the second bracket, and a shaft supporting the first bracket, the second bracket, and the urging member; one of the first bracket and the second bracket is arranged to be rotatable about the shaft; the biasing member is connected to one of the first bracket and the second bracket that is not disposed to be rotatable with respect to the shaft, and biases the shaft so as to hold down the shaft; The wiring passes through the inside of the shaft. The projection system according to claim 1 .

11. the shaft is connected to the first bracket and is disposed so as to be rotatable relative to the second bracket; The shaft is formed with a first abutment portion, The second bracket is formed with a second abutment portion, When the shaft rotates relative to the second bracket, the first contact portion contacts the second contact portion, thereby preventing the shaft from rotating relative to the second bracket. The projection system according to claim 10.

12. the shaft is coupled to the second bracket and is disposed so as to be rotatable relative to the first bracket; The shaft is formed with a first abutment portion, The first bracket is formed with a second abutment portion, When the shaft rotates relative to the first bracket, the first contact portion contacts the second contact portion, thereby preventing the shaft from rotating relative to the first bracket. The projection system according to claim 10.

13. the shaft is coupled to the first bracket and is disposed rotatably relative to the second bracket; The first bracket is formed with a first abutment portion, The second bracket is formed with a second abutment portion, When the first bracket rotates relative to the second bracket, the first contact portion contacts the second contact portion, thereby preventing the first bracket from rotating relative to the second bracket. The projection system according to claim 10.

14. The shaft is formed with a third abutment portion, The second bracket is formed with a fourth contact portion, When the shaft rotates relative to the second bracket, the third contact portion contacts the fourth contact portion, thereby preventing the shaft from rotating relative to the second bracket, when the projection system is viewed in plan along the rotation axis, an angle formed between the optical axis when the first contact portion and the second contact portion contact each other and the optical axis when the third contact portion and the fourth contact portion contact each other is within 180 degrees, with the rotation axis as the center.

12. The projection system according to claim 3, 7, or 11.

15. a position where the first contact portion and the second contact portion contact each other is set so that, when the stand base is placed on an installation surface, an angle formed by the optical axis with respect to a virtual axis perpendicular to the installation surface is within 120 degrees; The projection system of claim 14.

16. The shaft is formed with a third abutment portion, The first bracket is formed with a fourth contact portion, When the shaft rotates relative to the first bracket, the third contact portion contacts the fourth contact portion, thereby preventing the shaft from rotating relative to the first bracket, when the projection system is viewed in plan along the rotation axis, an angle formed by the optical axis when the first contact portion and the second contact portion are in contact with each other and the optical axis when the third contact portion and the fourth contact portion are in contact with each other is within 180 degrees, with the rotation axis as the center.

13. The projection system according to claim 4, 8, or 12.

17. a position where the first contact portion and the second contact portion contact each other is set so that, when the stand base is placed on an installation surface, an angle formed by the optical axis with respect to a virtual axis perpendicular to the installation surface is within 120 degrees; The projection system of claim 16.

18. The first bracket is formed with a third contact portion, The second bracket is formed with a fourth contact portion, When the first bracket rotates relative to the second bracket, the third contact portion contacts the fourth contact portion, thereby preventing the first bracket from rotating relative to the second bracket, when the projection system is viewed in plan along the rotation axis, an angle formed by the optical axis when the first contact portion and the second contact portion are in contact with each other and the optical axis when the third contact portion and the fourth contact portion are in contact with each other is within 180 degrees, with the rotation axis as the center.

14. The projection system according to claim 5, 9, or 13.

19. a position where the first contact portion and the second contact portion contact each other is set so that, when the stand base is placed on an installation surface, an angle formed by the optical axis with respect to a virtual axis perpendicular to the installation surface is within 120 degrees; 19. The projection system of claim 18.

20. the wiring is a power supply wiring, The connection terminal is a power supply terminal.

14. The projection system according to claim 1.

21. the projector has a first side surface and a second side surface in a direction perpendicular to the optical axis, the stand frame includes a first arm and a second arm; the first arm, the hinge unit, the first side surface, the second arm, and the second side surface are arranged in this order along the rotation axis; 14. The projection system according to claim 1.

22. When the projection system is viewed in a plan view in a direction along the rotation axis, The hinge unit is disposed within a range of one-third of the distance from the center of the first side surface to the outer periphery of the first side surface, as viewed from the center of the first side surface.

22. The projection system of claim 21.

23. a rotary table that is rotatable relative to the stand base; the rotary table is located below the stand base when the projection system is installed; a holding member for the connection terminal is provided on the stand base; 14. The projection system according to claim 1.

24. a rotary table that is rotatable relative to the stand base; the rotary table is located below the stand base when the projection system is installed; a first rotation restricting portion is provided on the stand base, and a second rotation restricting portion is provided on the rotary table; The first rotation restricting portion and the second rotation restricting portion come into contact with each other, thereby restricting the rotation range of the rotary table.

14. The projection system according to claim 1.

25. a protective member for protecting the wiring, the protective member covers at least a portion of the wiring where the wiring enters from inside the projector into inside the hinge unit; 14. The projection system according to claim 1.

26. a protective member for protecting the wiring, The protective member covers at least a portion of the wiring that enters from the inside of the hinge unit into the inside of the stand frame.

14. The projection system according to claim 1.

Images