Projection device and expansion unit for the same

Abstract

To provide a projection device which allows an expansion unit to be accurately attached thereto, and an expansion unit for the same.SOLUTION: A projection device 10 is provided, comprising a housing 20 with a projection optical system 72 for outputting projection light L. The housing 20 has a first alignment part (51A) for aligning the mounting position of an expansion unit for the projection device provided on a parallel axis that overlaps with an optical axis P of the projection optical system 72 in planar view.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a projection device and an extension unit for a projection device. [Background technology]

[0002] Conventionally, in a projection device that projects an image formed using a micromirror display element called DMD (Digital Micromirror Device) or a liquid crystal panel onto a screen, a configuration that enables the expansion of functions by mounting an expansion unit has been proposed. For example, Patent Document 1 discloses a ceiling suspension device that fixes a projector (projection device) in a suspended state by fixing a projector side bracket fixed to a projector (projection device) to a ceiling side bracket fixed to the ceiling side. In this projector, the projector side bracket is fixed by inserting fastening screws into four screw insertion holes. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2000-122180 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the fixing method of the projection device (projector) of Patent Document 1, there are cases where the alignment accuracy is insufficient depending on the application of the extension unit.

[0005] An object of the present invention is to provide a projection device to which an extension unit can be attached with high positional accuracy, and an extension unit for the projection device. [Means for solving the problem]

[0006] The projection device of the present invention comprises a housing having a projection optical system that emits projection light, and the housing has a first alignment portion for aligning the mounting position of an expansion unit for the projection device on a parallel axis that overlaps with the optical axis of the projection optical system in a planar view.

[0007] The extension unit for the projection device of the present invention includes a round hole that engages with the first alignment portion of the projection device described above, and an elongated hole that engages with the second alignment portion. Effect of the Invention

[0008] According to the present invention, it is possible to provide a projection device to which an extension unit can be attached with high positional accuracy, and an extension unit for the projection device. [Brief description of the drawings]

[0009] [Figure 1] 1 is a perspective view of the top surface side of a projection device according to an embodiment of the present invention, seen from the front. [Diagram 2] 1 is a perspective view of the lower surface side of a projection device according to an embodiment of the present invention, seen from behind. [Diagram 3] 3A and 3B are enlarged cross-sectional views of the periphery of the leg member of the projection device according to the embodiment of the present invention, where (a) is a cross-sectional view of the projection device shown in FIG. 2 taken along IIIa-IIIa, and (b) is a cross-sectional view of the projection device shown in FIG. 2 taken along IIIb-IIIb. [Figure 4] 1 is a schematic plan view showing an internal configuration of a projection device according to an embodiment of the present invention. [Diagram 5] FIG. 2 is a bottom view of the projection device according to the embodiment of the present invention. [Figure 6] 1A and 1B are diagrams showing a state in which an extension unit is attached to a projection device according to an embodiment of the present invention, in which FIG. 1A is a perspective view seen from the front, and FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described. As shown in Fig. 1 and Fig. 2, the projection device 10 is provided with a housing 20 having six faces (upper face 20a, lower face 20b, left side face 20c, right side face 20d, front face 20e, and rear face 20f) in a substantially rectangular box shape with the left-right direction as the longitudinal direction. The projection device 10 has a projection port 11 on the front face 20e side. The projection device 10 emits projection light L from the projection port 11. In the following description, the left and right of the projection device 10 refer to the left-right direction with respect to the projection direction from the projection port 11 (second direction D2 in Fig. 4), and the front and rear refer to the front and rear direction with respect to the traveling direction of the projection light L of the projection device 10 (first direction D1 in Fig. 4).

[0011] The housing 20 has an upper case 21 having an upper surface 20a and a part of the right side surface 20d, and a lower case 22 having a lower surface 20b (bottom surface) and a part of the right side surface 20d. The housing 20 has a front panel 23 on the front side, a rear panel 24 on the rear side, and a left panel 25 on the left side. The front panel 23 extends to a left front corner 20g of the housing 20, and the left front corner 20g is rounded. In addition, the front panel 23 is provided with a projection port opening 23a of the projection port 11, an intake port 23b, and an exhaust port 23c.

[0012] The rear panel 24 extends to the left rear corner 20h, which is rounded. Two air intakes 24a are provided in the rear panel 24. The left panel 25 is provided between the left front corner 20g and the left rear corner 20h, where the front panel 23 and the rear panel 24 extend. The left panel 25 is provided with the air intake 25a and a connection port 25b for a connector for image input / output or the like. The front panel 23, the rear panel 24, and the left panel 25 each have a center in the up-down direction bent toward the inside of the housing 20.

[0013] Among the edges of the housing 20, edges 21a, 22a which are connected to the right side surface 20d of the upper case 21 and the lower case 22 are curved with R-angled corners. Edges of the housing 20 other than edges 21a, 22a (for example, an edge between the top surface 20a and the left side surface 20c) are substantially right-angled. A power plug connection port 22b is provided on the right side surface 20d of the lower case 22. In addition, an operation panel 21b which can be used to set the projection device 10 is provided on the top surface 20a of the upper case 21.

[0014] A tilt arm 30 and two installation parts 40 are provided on the lower surface 20b of the lower case 22. The tilt arm 30 has an elongated installation abutment part 31c aligned with the longitudinal direction of the housing 20. The tilt arm 30 rotates by two arms (left arm part 31a and right arm part 31b) so that the installation abutment part 31c located at the front opens, and the projection device 10 can be projected at any installation angle (elevation angle) within a predetermined range. In addition, a concave grip part 26 is provided at the approximate center of the front lower edge part of the housing 20 on the lower surface 20b of the lower case 22. The grip part 26 is approximately rectangular and long in the longitudinal direction of the housing 20. A part of the rear inner edge side of the grip part 26 is covered by the installation abutment part 31c of the tilt arm 30 when the tilt arm 30 is stored as shown in FIG. 2.

[0015] The housing 20 has installation sections 40 on the left and right sides behind the tilt arm 30. The installation sections 40 have leg members 60, which are elastic members, and support sections 50 that support the fixing of the leg members 60. The leg members 60 can be detachably attached to the housing 20 at the support sections 50.

[0016] Furthermore, the housing 20 has a plurality of screw holes 20b1, which are fixing parts, on the bottom surface 20b. In this embodiment, the screw holes 20b1 are provided in two locations on the front side and one location on the rear side of the projection device 10. The rear screw hole 20b1 is located on the center side in the left-right direction of the two front screw holes 20b1.

[0017] The support part 50 shown in the enlarged view of part B in FIG. 2 has a substantially cylindrical alignment protrusion 51 (first alignment protrusion, first alignment part) which is a convex part protruding substantially vertically downward (upward in FIG. 2) from the lower surface 20b of the housing 20, and a peripheral rib 52 provided in a long rectangular ring shape around the outer periphery of the alignment protrusion 51. The alignment protrusion 51 can be used to adjust the mounting position of the expansion unit 80 described later. The peripheral rib 52 is provided lower than the height (height from the lower surface 20b) of the leg member 60 attached to the support part 50. The height of the peripheral rib 52 is set to, for example, half or less of the height of the leg member 60. The peripheral rib 52 includes a long first side portion 52a and a short second side portion 52b. As shown in FIG. 3(a) and FIG. 3(b), the bottom surface 53 between the alignment protrusion 51 and the peripheral rib 52 is provided lower (toward the inside of the housing 20) than the lower surface 20b which is the outer surface of the housing 20 outside the peripheral rib 52.

[0018] The outer circumferential rib 52 has an inner inclined portion 521 that is inclined so as to become lower toward the alignment protrusion 51. The inner inclined portion 521 is provided in a flat surface shape on the first side portion 52a and the second side portion 52b. The outer circumferential rib 52 has a standing wall 522 between the bottom surface 53 and the inner inclined portion 521. The standing wall 522 is provided in a flat surface shape on the first side portion 52a and the second side portion 52b so as to be approximately perpendicular to the bottom surface 53.

[0019] Furthermore, the outer peripheral rib 52 has an outer inclined portion 523 disposed adjacent to the inner inclined portion 521 via a peak 524. The outer inclined portion 523 is inclined so as to become lower toward the lower surface 20b side opposite the alignment protrusion 51. The outer inclined portion 523 is provided continuously from the lower surface 20b of the housing 20 in the form of a concave curved surface.

[0020] The leg member 60 has an outer shape that is generally semi-cylindrical (or kamaboko-shaped) with its axis oriented in the front-rear direction (see also FIG. 2). The leg member 60 includes a long first edge portion 60a and a short second edge portion 60b. The leg member 60 has a curved surface portion 61 that curves in the left-right direction of the housing 20, and an inclined portion 62 in which both ends of the short side located in the front and rear are inclined as if cut obliquely. In the cross-sectional view of FIG. 3(b), the leg member 60 is generally trapezoidal with the short upper base side disposed on the lower side (ground side).

[0021] An engaging portion 63, which is a convex portion protruding in the shape of a short rectangular prism, is provided on the side of the leg member 60 opposite to the curved portion 61 (the side that abuts against the housing 20). The engaging portion 63 has a flat-surface-like abutting portion 631. The leg member 60 also has a circular recess 632 at approximately the center of the abutting portion 631. A side surface 633 of the engaging portion 63 is disposed approximately perpendicular to the abutting portion 631 and is provided in the shape of a flat surface (see Figs. 3(a) and 3(b)). The engaging portion 63 is formed to have a width shorter (shorter in the front-rear and left-right directions) than the space surrounded by the standing wall 522. Therefore, when the engaging portion 63 is disposed on the bottom surface 53, a gap is provided between the side surface 633 of the engaging portion 63 and the standing wall 522.

[0022] Furthermore, the leg member 60 has an inclined portion 634 between the curved portion 61 and the side surface 633. The inclined portion 634 is disposed so as to form an obtuse angle with respect to the side surface 633, and is provided in the form of a flat surface.

[0023] A double-sided tape 64 having a circular opening 641 with approximately the same opening diameter as the recess 632 is attached to the contact portion 631 (see an enlarged view of part A in FIG. 2). The opening 641 and the recess 632 are disposed in correspondence with each other (see FIG. 3(a) and the like).

[0024] The leg member 60 is adhered and fixed to the bottom surface 53 of the support part 50 by the double-sided tape 64 provided on the abutment part 631 with the alignment protrusion 51 inserted through the opening 641 and the recess 632. The leg member 60 is placed on the support part 50 with a gap G between the inclined part 634 and the inner inclined part 521. When removing the leg member 60, a narrow tool such as a flat head screwdriver is inserted into this gap G and the leg member 60 is urged to be lifted from the bottom surface 53 by the principle of leverage with the top part 524 as a fulcrum, whereby the leg member 60 can be easily removed from the support part 50.

[0025] The aforementioned outer peripheral rib 52 is provided lower than the height (height from the lower surface 20b) of the leg member 60 attached to the support portion 50. Therefore, the area where the leg member 60 is hidden is relatively small, and a good appearance can be obtained. In addition, when the projection device 10 is placed with the leg member 60 on the ground, if an external force is applied in the front-back or left-right direction, the leg member 60 may receive a tensile force in the direction of peeling from the projection device 10. In the leg member 60 of this embodiment, the alignment protrusion 51 and the recessed portion 632 are engaged with each other, so that the leg member 60 can resist the tensile force in the direction of peeling from the support portion 50. In addition, the side surface 633 and the inclined portion 634 of the leg member 60 are abutted against the vertical wall 522 and the inner inclined portion 521 of the outer peripheral rib 52, and the movement of the leg member 60 can be restricted. Therefore, the leg member 60 can be prevented from being unintentionally displaced or falling off.

[0026] Here, an outline of the internal configuration of the projection device 10 will be described. FIG. 4 is a schematic plan view of the projection device 10 viewed from above with the upper case 21 omitted. The projection device 10 has a light source optical system 71 and a projection optical system 72. The light source optical system 71 includes a light source side housing 710 and optical members housed in the light source side housing 710. The light source optical system 71 emits blue, green, and red light source light in a time-division manner, and guides image light formed by a DMD, which is a display element, to the projection optical system 72 side. Therefore, the optical members housed in the light source side housing 710 include light sources (laser diodes, LEDs, phosphors, etc.) that emit light source light of each color, lenses (concave lenses and convex lenses), mirrors (full-color reflecting mirrors and dichroic mirrors), light guide members (glass rods, microlens arrays, diffusion plates, etc.) that adjust the luminance distribution of the light source light, and the like. The projection device 10 of this embodiment is configured by a so-called DLP (Digital Light Processing) method.

[0027] The projection optical system 72 includes a projection-side housing 720, and a fixed lens and a movable lens housed in the projection-side housing 720. The projection optical system 72 emits image light guided from the light source optical system 71 side as projection light L from a projection port 11 (see also FIG. 1). Zoom adjustment and focus adjustment can be performed by adjusting the movable lens of the projection optical system 72. The projection light L emitted from the projection port 11 is projected onto a projection target such as a screen or wall surface (not shown).

[0028] The light source side housing 710 and the projection side housing 720 are connected while being aligned relative to each other. A plurality of flanges 711a to 711d are provided around the outer periphery of the light source side housing 710 on the lower case 22 side. A round hole 712 is provided in the flange 711a located on the front side of the light source side housing 710, as shown in the enlarged view of part D. A long hole 713 having a long axis in the front-rear direction (first direction D1) is provided in the flange 711b located on the rear side of the light source side housing 710, as shown in the enlarged view of part E.

[0029] Further, the lower case 22 is provided with internal alignment protrusions 221, 222 (see the enlarged views of D and E). The internal alignment protrusions 221, 222 protrude upward (towards the front side of FIG. 4) from the inner surface of the lower case 22. The internal alignment protrusions 221, 222 are provided in a columnar shape having a cross-shaped cross section. The internal alignment protrusion 221 provided on the front surface 20e side of the housing 20 and the internal alignment protrusion 222 provided on the rear surface 20f side are disposed on a reference axis Q in the front-rear direction (first direction D1).

[0030] Further, the light source side housing 710 is fastened and fixed to the screw hole provided on the inner surface side of the lower case 22 by inserting the screw member 714 into the screw hole (not shown) provided in each of the flange parts 711a to 711d. Therefore, the light source side housing 710 is fixed in a state of being aligned with the lower case 22. The projection side housing 720 of the projection optical system 72 connected to the light source side housing 710 is also fixed in a state of being aligned with the lower case 22 via the light source side housing 710. The optical axis P of the projection light L guided by the projection side housing 720 is set parallel to the imaginary line connecting the center of the round hole 712 and the center of the long hole 713. Therefore, the projection optical system 72 is disposed so that the optical axis P is parallel to the reference axis Q of the first direction D1. In other words, the internal alignment protrusions 221, 222 are provided in a plurality of positions along the first direction D1 parallel to the optical axis P in the plan view of FIG. 4 or the bottom view of FIG. 5.

[0031] FIG. 5 is a bottom view of the projection device 10 as viewed from the lower surface 20b side. In FIG. 5, the tilt arm 30 and the leg member 60 are omitted from illustration. A part of the alignment protrusions 51A (51) and another part of the alignment protrusions 51B (51) are provided on the different corners 20h, 20i side of the lower surface 20b of the housing 20 and on the rear side (rear surface 20f) side of the housing 20. The alignment protrusion 51A is disposed near the left rear corner 20h of the lower surface 20b on a parallel axis that overlaps with the optical axis P of the projection optical system 72 as viewed from the lower surface 20b side in a plan view (in this embodiment, on a parallel axis located on the lower side of the housing 20 than the optical axis P). In addition, the alignment protrusion 51B (second alignment protrusion, second alignment portion) is disposed near the right rear corner 20i of the lower surface 20b at a position different from the above-mentioned parallel axis of the optical axis P. The alignment protrusion 51A and the alignment protrusion 51B are disposed in a direction perpendicular to the optical axis P (a second direction D2 perpendicular to the first direction D1). That is, when viewed from the alignment protrusion 51A, the alignment protrusion 51B is provided on a normal line R of the second direction D2 that perpendicularly intersects with the above-mentioned parallel axis.

[0032] 6(a) and 6(b) show the projection device 10 with an extension unit 80 (projection device extension unit) attached to the underside 20b. The projection device 10 can be used by attaching the projection device 10 to a ceiling or the like using the extension unit 80. The extension unit 80 has a housing side fixing member 81, an intermediate member 82, and a ceiling side fixing member 83.

[0033] Housing side fixing member 81 is formed by bending various portions of a plate-like member, and has a flat connecting portion 811 connectable to intermediate member 82, and a fixed portion 813 fixed to housing 20. Connecting portion 811 has a hemispherical convex portion 811a connectable to intermediate member 82 on the upper side in Fig. 6(a). Fixed portion 813 is connected from the outer periphery of connecting portion 811 via legs 812, and includes three fixed portions 813a to 813c. Fixed portions 813a to 813c are arranged on the same plane.

[0034] The fixed portion 813a has an engaged portion 814a, which is an opening that can engage with the alignment protrusion 51A, and a screw hole 815 (details not shown). As shown in the enlarged view of part F, the engaged portion 814a is provided as a round hole. The fixed portion 813a is provided in the shape of a long flat plate in the first direction D1. A lens mounting portion 816 is provided extending from the front end of the fixed portion 813a in a direction substantially perpendicular to the front end. A circular opening 816a is provided on the inside of the lens mounting portion 816, with the central axis coinciding with the optical axis P.

[0035] The fixed portion 813b has an engaged portion 814b, which is an opening that can engage with the alignment protrusion 51B, and a screw hole 815. As shown in the enlarged view of part F, the engaged portion 814b is provided as a long hole that is elongated in a direction parallel to the first direction D1. The fixed portion 813c also has a screw hole 815.

[0036] The intermediate member 82 is formed in a cylindrical shape with a hollow portion provided in the vertical direction. The lower end of the intermediate member 82 is connected to the protruding portion 811a so that the angle can be adjusted. In addition, a flange-shaped portion provided on the upper part of the intermediate member 82 is connected to the ceiling side fixing member 83. Details of the connection structure between the intermediate member 82, the protruding portion 811a, and the ceiling side fixing member 83 are not shown in the figures.

[0037] The ceiling side fixing member 83 is formed in a substantially equilateral triangular flat plate shape. The ceiling side fixing member 83 is fixed to the intermediate member 82. Mounting holes 831 are provided at the corners corresponding to the apexes of the triangle.

[0038] When the extension unit 80 is used, first, the alignment protrusion 51A provided on the lower surface 20b of the projection device 10 is engaged with the engaged portion 814a of the extension unit 80, and the alignment protrusion 51B is engaged with the engaged portion 814b. The engagement of the engaged portion 814a determines the position of the extension unit 80 based on the engaged portion 814a, and the engagement of the engaged portion 814b determines the angular position of the extension unit 80 around the vertical axis. At this time, the position of the screw hole 20b1 (see FIG. 5), which is a fixing portion provided on the lower surface 20b of the projection device 10, corresponds to the position of the screw hole 815 of the housing side fixing member 81. Therefore, by fastening the screw member 84 inserted into the screw hole 815 of the housing side fixing member 81 to the screw hole 20b1, the extension unit 80 can be fixed in a state of being aligned with high precision to the projection device 10.

[0039] The extension unit 80 can be fixed to the ceiling of a room or the like by screwing it through the mounting holes 831. Therefore, the projection device 10 can be used in a state where it is suspended from the ceiling by the extension unit 80.

[0040] 6(a) of the lens attachment portion 816. Since the central axis of the opening 816a coincides with the optical axis P of the projection light L, the optical axis of the conversion lens can be easily aligned with the optical axis P of the projection light L. This allows the projection light L emitted from the projection device 10 to be emitted at a wider angle.

[0041] In this manner, in the projection device 10 of this embodiment, the extension unit 80 can be aligned with high precision with respect to the internal units (light source optical system 71 and projection optical system 72) of the projection device 10 by 221, 222 and 51A, 51B provided on the lower case 22, which is the same member. Furthermore, if the lower case 22 is formed with high precision by die-casting metal, the extension unit 80 can be aligned with 71, 72 with even higher precision. Furthermore, when the projection device 10 is used without the extension unit 80, the alignment protrusions 51 are covered by the leg members 60, so that the impact on the appearance of the projection device 10 can be reduced.

[0042] As described above, the present invention is not limited to the present embodiment, and various modifications can be made to the present invention. For example, the extension unit 80 in the present embodiment is a ceiling bracket provided with a lens attachment portion 816 to which a conversion lens can be attached, but the extension unit 80 may have other functions.

[0043] In addition, in this embodiment, an example has been shown in which the leg members 60 are adhered and fixed to the bottom surface of the support portion 50 by the double-sided tape 64, but the leg members 60 may be fixed by applying an adhesive instead of the double-sided tape 64.

[0044] In addition, in this embodiment, the projection side housing 720 of the projection optical system 72 has been described as being indirectly aligned and fixed via the light source side housing 710 of the light source optical system 71 by the internal alignment protrusions 221, 222, but the internal alignment protrusions 221, 222 may be provided at appropriate positions on the inner surface of the lower case 22 to directly align and fix the projection side housing 720.

[0045] In addition, in the present embodiment, an example has been described in which the alignment portion on the housing 20 side is a convex portion that functions as the alignment protrusion 51, but the alignment portion may be either a convex portion or a concave portion. Thus, although the leg member 60 has been described as having the concave portion 632, it is not limited to the concave portion 632, and may be configured to have either a convex portion or a concave portion provided at a position corresponding to either the convex portion or the concave portion of the alignment portion on the housing 20 side. When the alignment portion on the housing 20 side is the alignment protrusion 51A that is a convex portion, it can function as a core material of the leg member 60, and deformation of the leg member 60, such as compression and distortion, can also be suppressed.

[0046] As described above, according to the embodiment of the present invention, the projection device 10 includes a housing 20 having a projection optical system 72 that emits projection light L, and the housing 20 has a first alignment portion (51A) for aligning the mounting position of the projection device expansion unit (80) on a parallel axis that overlaps with the optical axis P of the projection optical system 72 in a plan view. This allows the reference position of the expansion unit 80 to be provided on a parallel axis that overlaps with the optical axis P in a plan view, and the expansion unit 80 can be mounted with high positional accuracy in relation to the projection light L as well.

[0047] Furthermore, the housing 20 has internal alignment protrusions 221, 222, and the projection device 10 in which the projection optical system 72 is aligned and fixed by the internal alignment protrusions 221, 222 can set the position of the optical axis P and the position of the extension unit 80 based on the reference axis Q of the housing 20, which is an integral member provided with the alignment protrusion 51A. Therefore, the optical axis P and the extension unit 80 can be aligned with high precision.

[0048] In addition, the projection device 10 has multiple internal alignment protrusions 221, 222 arranged along a first direction D1 that is parallel to the optical axis P in a planar view, so that the projection device 10 can align the optical axis P and the extension unit 80 with high precision using the internal alignment protrusions 221, 222 as references.

[0049] Also, a configuration has been described in which the housing 20 has a second alignment portion (51B) for aligning the mounting position of the projection device extension unit, and the second alignment portion (51B) is provided on a normal line R of the second direction D2 perpendicularly intersecting the parallel axis as viewed from the first alignment portion (51A). This allows the extension unit 80 to be aligned with high precision in the rotational direction within the plane of the first direction D1 and the second direction D2.

[0050] In addition, the projection device 10 in which the first alignment portion (51A) and the second alignment portion (51B) are provided on different corners 20h, 20i of the bottom surface (lower surface 20b) of the housing 20 and on the rear side (rear surface 20f side) of the housing 20 can position some of the alignment protrusions 51A on the optical axis P while positioning the leg members 60 in a position where the projection device 10 can be stably placed.

[0051] Furthermore, in the projection device 10 including the leg member 60 which is detachably attached to the housing 20 and has a recess at a position corresponding to a protrusion functioning as the first alignment portion (51A) or the second alignment portion (51B), when not in use for mounting the extension unit 80, the first alignment portion (51A) or the second alignment portion (51B) which is a protrusion can be covered and hidden by the leg member 60, thereby reducing the impact on the appearance while maintaining expandability. Furthermore, the engagement between the recesses and protrusions can prevent the leg member 60 from shifting or falling off.

[0052] Furthermore, the projection device 10 in which the leg members 60 have curved surface portions 61 that are curved across the left-right direction of the housing 20 and inclined portions 62 that are inclined as if cut at an angle at both ends of the short side is less likely to get caught even when an external force is applied to the leg members 60, and can prevent falling off or slipping. Also, the appearance of the installation unit 40 can be improved.

[0053] In addition, the extension unit 80 of the projection device 10, which has a round hole (814a) that engages with the first alignment portion (51A) of the projection device 10 and an elongated hole (814b) that engages with the second alignment portion (51B), can align the extension unit 80 with respect to the projection device 10 with high precision and add a variety of extended functions to the projection device 10.

[0054] The above-described embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0055] 10: Projection device 11: Projection port 20: Housing 21: Upper case 21a: Edge 21b: Operation panel 22: Lower case 26: Grip 30: Tilt arm 40: Installation section 50: Support section 51 (51A, 51B): Alignment protrusion 52: Outer rib 53: Bottom surface 60: Leg member 61: Curved surface 62: Inclined section 63: Engagement section 71: Light source optical system 72: Projection optical system 80: Extension unit 221: Internal alignment protrusion 222: Internal alignment protrusion 631: Contact section 710: Light source side housing 720: Projection side housing 812: Leg 813 (813a to 813c): Fixed section 814a, 814b: Engaged section 816: Lens attachment section D1: First direction D2: Second direction G: Gap L: Projection light P: Optical axis Q: Reference axis R: Normal line

Claims

1. a housing having a projection optical system that emits projection light; the housing has a first alignment portion for aligning an attachment position of the projection apparatus extension unit on a parallel axis that overlaps with an optical axis of the projection optical system in a plan view; Projection device.

2. the housing has an internal alignment protrusion; the projection optical system is aligned and fixed by the internal alignment protrusions; 2. The projection device of claim 1.

3. The projection device according to claim 2 , wherein the internal alignment protrusion is provided in a plurality of positions along a first direction parallel to the optical axis in a plan view.

4. the housing has a second alignment portion for aligning an attachment position of the projection device extension unit, The projection device according to claim 3 , wherein, as viewed from the first alignment portion, the second alignment portion is provided on a normal line of a second direction perpendicular to the parallel axis.

5. The projection device according to claim 4 , wherein the first alignment portion and the second alignment portion are provided on different corner sides of the bottom surface of the housing and on the rear side of the housing.

6. 6. The projection device according to claim 4, further comprising a leg member removably attached to the housing, the leg member having a recess at a position corresponding to a protrusion functioning as the first alignment portion or the second alignment portion.

7. 7. The projection device according to claim 6, wherein the leg member has a curved surface portion that is curved in the left-right direction of the housing, and an inclined portion that is inclined as if both ends on a short side are cut obliquely.

8. 8. An extension unit for a projection device, comprising: a round hole that engages with the first alignment portion of the projection device according to claim 4; and an elongated hole that engages with the second alignment portion.

Images