Image projection device

Abstract

To provide an image projection device that can be used as a lighting tool.SOLUTION: An image projection device 1 is provided, comprising an image projection unit 11, a support 14 for supporting the image projection unit 11 in such a way that a projection direction of the image projection unit 11 can be changed, and a projection target unit 12 for receiving illumination light emitted from the image projection unit 11. The image projection unit 11 is provided outside a housing 12a of the projection target unit 12, and the projection target unit 12 receives illumination light emitted from the image projection unit 11 on the housing 12a of the projection target unit 12.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] BACKGROUND ART Conventionally, there is a projector that is configured to be movable between a first movement position where projection light is directly projected and a second movement position where projection light is reflected by a mirror and projected (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-259252 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the projector described in Patent Document 1 cannot be used as a lighting fixture.

[0005] SUMMARY OF THE INVENTION It is an object of the present invention to provide a projection device that can be used as a lighting fixture. [Means for solving the problem]

[0006] In order to solve the above problems, a projection device according to the present invention comprises: A projection unit; a support body that supports the projection unit so as to change the projection direction of the projection unit; a projection target unit that receives illumination light emitted from the projection unit; Equipped with the projection unit is provided outside a housing of the projection target unit, The projection target receives the illumination light on a housing of the projection target. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a projection device that can be used as a lighting fixture. [Brief explanation of the drawings]

[0008] [Figure 1] (a) is a perspective view showing an example of the external configuration of a cylindrical projection device when the projection direction is downward, and (b) is a perspective view showing an example of the external configuration of a cylindrical projection device when the projection direction is horizontal. [Figure 2] FIG. 1(a) is a front view of a prismatic projection device, and FIG. 1(b) is a side view of the prismatic projection device. [Figure 3] FIG. 2 is a top view of a projection target portion of a prismatic projection device. [Figure 4] 1(a) is a diagram showing how projection light is refracted when a prism sheet 221 with a prism shape of an isosceles triangle and an apex angle of 70° is attached to the inside of the side surface of the housing of the projection target, and FIG. 1(b) is an enlarged view of the dashed-dotted line portion of FIG. [Figure 5] FIG. 10 is a diagram showing an absorption layer disposed on the prisms of the prism sheet. [Figure 6] 10 is a diagram showing a state in which an absorption layer is arranged on the outside of the prisms of the prism sheet and the housing of the projection target portion. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiments described below are subject to various limitations that are technically preferable for implementing the present invention. Therefore, the technical scope of the present invention is not limited to the following embodiments and illustrated examples.

[0010] First Embodiment [Configuration of Projection Device 1] First, the configuration of the projection device 1 of the first embodiment will be described. Fig. 1 is a perspective view showing an example of the external configuration of a projection device 1. Fig. 1(a) shows a case where the projection direction is downward, and Fig. 1(b) shows a case where the projection direction is horizontal. 1, the projection device 1 includes a projection unit 11, a projection target unit 12, a light source unit 13, a support 14, and a base 15. The projection unit 11, the projection target unit 12, and the light source unit 13 each have a cylindrical (columnar) housing 11a to 13a. In this embodiment, at least the housing 11a of the projection unit 11 and the housing 12a of the projection target unit 12 have the same radius (diameter).

[0011] The projection unit 11 is configured to include, inside a housing 11a, a display element such as a digital micromirror device (DMD), an optical system such as a group of projection lenses, an optical system driving unit, etc. The projection unit 11 adjusts the intensity distribution of light output from the light source unit 13 using the display element in accordance with the image to be projected, and projects the image onto the projection surface by emitting light (projection light L) toward the projection surface through the group of projection lenses driven by the optical system driving unit.

[0012] The projection unit 11 is provided outside the housing 12a of the projection target unit 12, above the housing 12a (above when viewed from the base 15), and is supported together with the housing 12a by the support body 14. That is, as shown in FIGS. 1(a) and 1(b), when the base 15 is used as a reference, the projection unit 11 is supported by the support body 14 so as to be provided at a position above the projection target unit 12. A rotation hinge 141 is provided on the support body 14, and the projection unit 11 is supported by the support body 14 so as to be rotatable about the rotation hinge 141 as an axis, as shown in FIGS. 1(a) and 1(b). That is, the projection unit 11 is supported by the support body 14 so that the projection direction can be changed.

[0013] As shown in FIG. 1(a), when the exit 111 of the projection unit 11 (the exit of the projection light L) faces downward, i.e., when the projection direction of the projection unit 11 faces downward, the support body 14 supports the projection unit 11 and the projection target unit 12 so that the end of the housing 11a of the projection unit 11 on the exit 111 side and the upper end of the housing 12a of the projection target unit 12 face each other in close proximity or contact within a predetermined distance. By facing the projection direction of the projection unit 11 downward, as shown in FIG. 1(a), the housing 11a of the projection unit 11 and the housing 12a of the projection target unit 12 form a single cylindrical shape. Furthermore, the support body 14 is fixed (supported) to a base 15, but is not limited to this and may be fixed to the light source unit 13.

[0014] The projection target unit 12 has a housing 12a that is open at the top and hollow inside, and receives projection light L (illumination light) emitted from the projection unit 11 through the emission port 111 with the projection direction facing downward in all directions from the inside of the side surface of the housing 12a. The housing 12a is made of a transparent resin material such as an acrylic material that is light-transmitting, and a diffusion sheet containing a diffusing material that diffuses light is attached to the inside of the side surface of the housing 12a, at least in the range (the range in the longitudinal direction of the housing 12a) that the projection light L from the projection unit 11 can hit. In other words, the projection target unit 12 receives, transmits, and diffuses the projection light L emitted from the projection unit 11 with the projection direction facing downward inside the side surface of the housing 12a, and functions as a screen for projecting an image and as a light source for supplying light to the outside. In addition, a fisheye lens or a conversion lens for diffusing the projection light L from the projection unit 11 may be provided on the upper part of the housing 12a.

[0015] The support body 14 has a hollow pipe shape inside, and wiring such as optical fibers that connect the projection unit 11 and the light source unit 13 are provided inside the support body 14, so that the light output by the light source unit 13 is supplied to the projection unit 11.

[0016] The light source unit 13 includes a light source such as a laser diode or an LED (Light Emitting Diode) inside a housing 13a, and outputs light to the projection unit 11 via an optical fiber. In this embodiment, the projection unit 11 and the light source unit 13 are separate bodies, but the light source unit 13 may be integrated with the projection unit 11. In other words, the light source unit 13 may be configured to be provided inside the housing 11a.

[0017] The projection device 1 configured as described above can function as a projector by directing the projection light L of a viewing image, such as a movie, from the projection unit 11's exit 111 toward a projection surface 3, such as a wall or screen, provided outside the projection device 1, as shown in FIG. 1(b). Alternatively, as shown in FIG. 1(a), the projection unit 11 can be directed downward to project the projection light L of a lighting effect image, such as a monochromatic image, toward the projection target 12. This allows the projection device 1 to be used as a lighting fixture, since the projection light L of the lighting effect image is received in all directions from the side of the projection target 12, thereby projecting the lighting effect image. Note that the lighting effect image is not limited to a monochromatic image. Other examples of lighting effect images include, but are not limited to, images reminiscent of the light of flames or stars. Note that the projection surface 3 is the projection target surface onto which the viewing image is projected, but the projection surface 3 is not included in the projection target 12 in the present invention.

[0018] In this way, the projection device 1 can function as a projector to project a viewable image onto an external projection surface 3, and can also be used as a lighting device by switching the projection direction. Furthermore, when the light exit 111 of the projection unit 11 is facing downward, the housing 11a of the projection unit 11 and the housing 12a of the projection target unit 12 are formed to form a single cylindrical shape (a substantially integrated cylindrical shape), so that light L emitted from the light exit 111 is prevented from leaking outside the housing 12a. Therefore, even when the projection device 1 is used as a lighting device, the aesthetic design is not impaired, and wasted light L can be reduced, so that power consumption of the projection unit 11 (or light source unit 13) can be reduced even when it is desired to brightly illuminate the projection target unit 12.

[0019] <Second embodiment> In the first embodiment, the projection device according to the present invention is described as a cylindrical projection device 1, but the shape of the projection device is not limited to a cylindrical shape. In the second embodiment, a prismatic projection device 2 will be described.

[0020] Fig. 2 is a diagram showing the external configuration of the projection device 2. Fig. 2(a) is a front view of the projection device 2, and Fig. 2(b) is a side view. Fig. 3 is a top view of the projection target 22 of the projection device 2. As shown in Fig. 2, the projection device 2 is configured to include a projection unit 21, a projection target 22, a support 24, a base 25, etc.

[0021] The projection unit 21 is configured to include, within its housing 21a, the components of the projection unit 11 and the light source unit 13 (such as a light source, a display element, an optical system, and an optical system driver). The housing 21a of the projection unit 21 is prismatic and is provided above the housing 22a of the projection target unit 22. The housing 21a is supported by two supports 24 provided on the left and right sides of the upper part of the housing 22a of the projection target unit 22. That is, as shown in FIGS. 2(a) and 2(b), with the base 25 as the reference, the projection unit 21 is supported by the supports 24 so as to be located above the projection target unit 22. Each of the supports 24 is provided with a rotation hinge 241, and the housing 21a is supported by the supports 24 so as to be rotatable about the rotation hinge 241 as shown in FIGS. 2(a) and 2(b). That is, the projection unit 21 is supported by the supports 24 so as to be able to change the projection direction.

[0022] The support body 24 supports the projection unit 21 so that, when the exit 211 of the projection unit 21 (the exit of the projection light L) faces downward, that is, when the projection direction of the projection unit 21 faces downward, the end of the housing 21a of the projection unit 21 on the exit 211 side faces the upper end of the housing 22a of the projection target unit 22, and the end faces the upper end of the housing 22a of the projection target unit 22, in close proximity or in contact with each other within a predetermined distance. By facing the projection direction of the projection unit 21 downward, as shown in FIG. 2(a), the housing 21a of the projection unit 21 is housed in a recess formed by the support body 24 and the upper end of the housing 22a, and the housing 21a of the projection unit 21 and the housing 22a of the projection target unit 22 form a single prismatic shape.

[0023] 2(a), the projection target unit 22 receives the projection light L emitted from the projection unit 21 through the emission port 211 with the projection direction facing downwards on the inside of all side surfaces (front, back, right side, left side) of the housing 22a. Note that the upper part of the housing 22a may be provided with a fisheye lens or a conversion lens to diffuse the projection light L from the projection unit 21. The housing 22a is made of a light-transmitting material (e.g., a transparent resin material such as an acrylic material) containing a diffusing material for diffusing light. As shown in the top view of FIG. 3 , the housing 22a has an opening at the top and a hollow interior, and the projection light L emitted by the projection unit 21 in a downward projection direction is received by the inside of the side surfaces of the housing 22a in all directions. That is, the projection target unit 22 receives the projection light L emitted by the projection unit 21 in a downward projection direction by the inside of the side surfaces of the housing 22a, transmits and diffuses the light, thereby functioning as a screen for projecting an image and as a light source for supplying light to the outside. A wiring pipe 223 is provided within the housing 22a, and wiring cables such as a power line supplied from a power supply unit (not shown) outside the projection device 2 are provided inside the wiring pipe 223.

[0024] Here, the light beams transmitted through the projection target 22 cannot be seen by the observer unless they are directed toward the observer's eyes. For example, if the height of the observer's line of sight when sitting is approximately 1 m and the height of the observer's line of sight when standing is approximately 1.5 m, and the observation distance (the distance between the projection device 1 and the observer) is approximately 2.5 m, the direction of the light beams transmitted through the projection target 22 needs to be approximately 0° to 30° upward, with the horizontal direction being 0°. However, since the projection light L emitted from the projection unit 21 is directed downward (for example, approximately 74° to 86° downward, with the horizontal direction being 0°), if the housing 22a does not contain a diffusing material, the direction of the light beams transmitted through the projection target 22 would be approximately 74° to 86° downward, with the horizontal direction being 0°. In this embodiment, since the housing 22a contains a diffusing material, the light beams transmitted through the projection target 22 are diffused, and some of them are directed toward the observer, but the amount of light is insufficient for the observer. Although the viewing angle can be increased by increasing the amount of diffusing material, the absolute amount of light cannot be increased, resulting in a decrease in brightness and a decrease in contrast due to an increase in returned light. Note that although the downward angle of the projection light L is set to approximately 74° to 86° above, the extent of this downward angle may vary depending on the performance of the projection lens. This angle range is an example obtained from a simulation conducted by the inventors. Generally, the projection light L emitted from the projection unit 21 is directed downward and is incident on the projection target unit 22 at an obliquely downward angle.

[0025] Therefore, in the projection device 2, as shown in Figures 2 and 3, a reflective prism sheet 221 is attached to the inside of all sides of the housing 22a of the projection target 22, at least in the range where the projection light L from the projection unit 21 can hit (the longitudinal range of the housing 22a indicated by arrow R in Figure 2), so that the direction of the light rays passing through the projection target 22 is upward.

[0026] The prisms of the prism sheet 221 come in various shapes, such as isosceles triangles and right-angled triangles. Simulations conducted by the inventors revealed that, as shown in FIGS. 4(a) and 4(b), attaching a prism sheet 221 having isosceles triangle prisms with an apex angle θ of 70° to the inside of the side of the housing 22a can direct the projected light L from the projection unit 21 almost upward. FIG. 4(a) illustrates the refraction of the projected light L when the projection direction of the projection unit 21 is set downward and a prism sheet 221 with isosceles triangle prisms and an apex angle of 70° is attached to the inside of the side of the housing 22a. FIG. 4(b) illustrates an enlarged view of the dashed-dotted line portion R1 in FIG. 4(a). In FIGS. 4(a) and 4(b), the projected light L is indicated by a solid line. For ease of explanation, the dashed-dotted line portion R1 in FIG. 4(b) has various line types and thicknesses. In FIG. 4(b), the solid line represents the projection light L, the dotted line represents the prism sheet 221, and the two-dot chain line represents the housing 22a (see FIG. 4(b) for details, as well as FIGS. 5 and 6). It has also been found that the smaller the apex angle θ of the prism, the larger the upward angle of the projection light L. Therefore, it is preferable to use a prism sheet 221 having isosceles triangular prisms with an apex angle θ of 70° or less. Assuming that the observer views the projection device 2 from an angle of approximately 0° to 30° above the horizontal, it is preferable that the apex angle θ of the prism be approximately 60° to 70°. Furthermore, multiple prism sheets 221 having prisms with different apex angles θ may be attached in combination. For example, a prism sheet with an apex angle θ of approximately 70° may be attached to the upper side of the housing 22a, and a prism sheet with an apex angle θ of approximately 60° to 65° may be attached to the lower side of the housing 22a so that the upward angle of the projection light L is larger.

[0027] Here, at the projection target unit 22, the projection light L from the projection unit 21 is projected in all directions (four directions, "directions in which the four flat surfaces constituting the side surfaces of the housing 22a are located") rather than in the usual one direction. Therefore, if a portion of the projection light L that should be reflected by the prisms and transmitted through the housing 22a is diffusely reflected from each of the four surfaces and returns to the interior, the portions interfere with each other, affecting the projection light L that transmits through each side surface of the housing 22a and reducing the contrast. Therefore, it is preferable to provide a light absorbing layer 222 on at least one of the outside of the side surfaces of the housing 22a and the prism sheet 221, in areas other than those through which the projection light L transmits, to prevent the light from returning to the interior of the housing 22a.

[0028] 5, for example, a black-painted absorbing layer 222 is arranged parallel to the surface (referred to as the reflective surface) of the prisms of the prism sheet 221 that reflects the projection light L, with an air layer A sandwiched between them. This allows the absorbing layer 222 to absorb light that returns from the reflective surface of the prism to the inside of the housing 22a, preventing light from returning to the inside and affecting the projection light L that passes through each surface of the housing 22a, thereby preventing a decrease in contrast. Note that the air layer A is provided to prevent the projection light L that should be transmitted to the outside from being absorbed by the absorbing layer 222 if the absorbing layer 222 is arranged in contact with the reflective surface, which could result in this happening.

[0029] 6, an absorbing layer 222 may be provided on a surface other than the reflecting surface of the prism of the prism sheet 221 that does not transmit light, and on an outer side surface of the housing 22a that does not transmit the projection light L. This allows the absorbing layer 222 to absorb light that attempts to return to the inside of the housing 22a, preventing light from returning to the inside and affecting the projection light L that passes through each surface of the housing 22a, thereby preventing a decrease in contrast. It is also possible to provide both the absorption layers 222 shown in FIG. 5 and FIG.

[0030] In this way, the prismatic projection device 2 can function as a projector to project an image for viewing onto an external projection surface 3, and can also be used as a lighting fixture by switching the projection direction. In addition, in the projection device 2, a prism sheet having prisms with a predetermined shape and angle is attached to the inside of the side surface of the housing 22a of the projection target unit 22, so that the projection light L projected from the projection unit 21 and passing through the housing 22a can be directed upward. Furthermore, by providing a black-painted absorption layer 222 in an area other than the area through which the projection light L passes on at least one of the prism sheet 221 and the outside of the housing 22a, it is possible to prevent light from returning inside the housing 22a.

[0031] As described above, the projection device 1(2) includes the projection unit 11(21), the support 14(24) that supports the projection unit 11(21) so that the projection direction of the projection unit 11(21) can be changed, and the projection target unit 12(22) that receives light (illumination light) emitted from the projection unit 11(21). The projection unit 11(21) is provided outside the housing 12a(22a) of the projection target unit 12(22), and the projection target unit 12(22) receives the light emitted from the projection unit 11(21) inside the housing 12a(22a) of the projection target unit 12(22). Therefore, by emitting projection light L from the projection unit 11 (21) to the projection target unit 12 (22), the projection light L is received inside the housing 12a (22a) of the projection target unit 12 (22), and the received light is projected onto the housing 12a (22a), so that the projection device 1 can be used as a lighting fixture.

[0032] Furthermore, the support 14 (24) supports the projection unit 11 (21) so that, when the projection direction of the projection unit 11 (21) is directed in a predetermined direction, the light emitted from the projection unit 11 (21) is received inside the housing of the projection target unit 12 (22). Therefore, when the projection direction of the projection unit 11 (21) is directed in a predetermined direction, the projection device 1 can be used as a lighting fixture. When directed in any other direction, the projection device 1 can be used as a projector.

[0033] Furthermore, the housing 12a (22a) of the projection target unit 12 (22) has an opening on the side of the projection unit 11 (21), and the support 14 (24) supports the projection unit 11 (21) so that, when the projection direction of the projection unit 11 (21) is directed in a predetermined direction, the end of the housing 11a (21a) of the projection unit 11 on the light exit port 111 (211) side faces the end of the housing 12a (22a) of the projection target unit 12 (22). Therefore, the projection light L from the projection unit 11 (21) can be reliably delivered to the inside of the housing 12a (22a) of the projection target unit 12 (22), providing good illumination.

[0034] Furthermore, the support 14 (24) supports the projection unit 11 (21) so that, when the projection direction of the projection unit 11 (21) is directed in a predetermined direction, the end of the housing 11 a (21 a) of the projection unit 11 (21) on the light outlet 111 (211) side faces the end of the housing 12 a (22 a) of the projection target unit 12 (22) on the opening side within a predetermined distance. Therefore, the projection light L from the projection unit 11 (21) can be reliably delivered to the inside of the housing 12 a (22 a) of the projection target unit 12 (22) with almost no leakage to the outside, providing even better illumination.

[0035] Furthermore, the side surface of the housing 12a (22a) of the projection target unit 12 (22) functions as a screen that receives light emitted from the projection unit 11 (21) and projects an image onto it. Therefore, an image can be projected onto the housing 12a (22a) of the projection target unit 12 (22).

[0036] Furthermore, since the side surfaces in all directions of the housing 12a (22a) of the projection target 12 (22) function as a screen, an image can be projected in all directions of the housing 12a (22a) of the projection target 12 (22).

[0037] Furthermore, a prism sheet 221 is attached to the inside of the side surface of the housing 22a of the projection target unit 22, and a light absorbing layer 222 is provided on the outside of the side surface of the housing 22a of the projection target unit 22 and in an area of the prism sheet 221 other than the part through which the light emitted from the projection unit 21 passes. Therefore, the projection light L passing through the housing 22a can be directed in a direction that is easy for the observer to view. Furthermore, it is possible to prevent light from returning to the inside of the housing 22a.

[0038] Furthermore, in the projection device 1 (2), when the projection direction of the projection unit 11 (21) is directed in a predetermined direction, the housing 11 a (21 a) of the projection unit 11 (21) and the housing 12 a (22 a) of the projection target unit 12 (22) form a single cylindrical or prismatic shape. Therefore, it is possible to provide a cylindrical or prismatic projection device that also serves as a lighting fixture.

[0039] Furthermore, the projection unit 11 (21) is located above the projection target unit 12 (22). Therefore, it can function as a lighting fixture by illuminating the projection target unit 12 (22) from above. Furthermore, since the projection unit 11 (21) is located above the projection target unit 12 (22), it is possible to easily project a viewing image onto the projection surface 3, which is located near the height of the observer's (user's) eye level.

[0040] The description of the above embodiment is a preferred example of the projection device 1 (2) according to the present invention, and the present invention is not limited to this.

[0041] For example, in the above embodiment, in the projection device 1 shown in Figure 1, a diffusion sheet containing a diffusion material is attached to the inside of the side of the housing 11a of the projection target 12, but as with the projection device 2, the housing 11a may be made of a transparent member containing a diffusion material, and a prism sheet such as that described in the second embodiment may be attached to the inside of the side.

[0042] Furthermore, in the above embodiment, an example was given in which the projection unit 11 is provided above the projection target unit 12, but the alignment direction is not limited to the vertical direction as long as the end of the projection unit 11 on the exit port 111 side and the end of the projection target unit 12 on the opening side are aligned in a straight line facing each other.

[0043] In the above embodiment, the light (illumination light) emitted from the projection unit 11 is received inside the housing 12a of the projection target unit 12, but this is not limiting. The light emitted from the projection unit 11 may be received on the surface of the housing 12a of the projection target unit 12. For example, the housing 12a may be a plate-shaped member, and the light may be received on the surface of this plate-shaped member.

[0044] In addition, the detailed configuration and operation of the projection device can be modified as appropriate without departing from the spirit of the invention.

[0045] Although the embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the above-described embodiments, but is defined by the claims. Furthermore, the technical scope of the present invention also includes equivalents to the claims that are not related to the essence of the present invention. [Explanation of symbols]

[0046] 1, 2 Projection device 11, 21 Projection section 11a, 21a housing 12, 22 Projection area 12a, 22a housing 13 Light source unit 14, 24 Support 15, 25 pedestal

Claims

1. A projection unit; a support body that supports the projection unit so as to change the projection direction of the projection unit; a projection target unit that receives illumination light emitted from the projection unit; Equipped with the projection unit is provided outside a housing of the projection target unit, the projection target unit receives the illumination light on a housing of the projection target unit; Projection device.

2. the projection target unit receives the illumination light inside a housing of the projection target unit; The projection device according to claim 1 .

3. the support member rotatably supports the projection unit so that the projection direction of the projection unit is oriented in a predetermined direction, and supports the projection unit so that the illumination light is received inside a housing of the projection target unit when the projection direction of the projection unit is oriented in a predetermined direction. The projection device according to claim 1 .

4. the housing of the projection target unit has an opening on the projection unit side, the support supports the projection unit such that, when the projection direction of the projection unit is directed in a predetermined direction, an end of a housing of the projection unit on an exit side of the illumination light faces an end of a housing of the projection target unit on an opening side. The projection device according to claim 1 .

5. the support supports the projection unit such that, when the projection direction of the projection unit is directed in a predetermined direction, an end of the housing of the projection unit on the illumination light exit side faces an end of the housing of the projection target unit on the opening side within a predetermined distance.

5. The projection device according to claim 4.

6. a side surface of the housing of the projection target unit functions as a screen that receives the illumination light and projects an image thereon; The projection device according to claim 1 .

7. All sides of the housing of the projection target function as a screen.

7. The projection device according to claim 6.

8. a prism sheet is attached to the inside of a side surface of the housing of the projection target unit; a light absorbing layer is provided in an area other than a portion through which the illumination light passes on at least one of the outer side of the housing of the projection target unit and the prism sheet; 8. The projection device according to claim 7.

9. When the projection direction of the projection unit is directed in a predetermined direction, the housing of the projection unit and the housing of the projection target unit form a single cylindrical or prismatic shape. The projection device according to claim 1 .

10. The projection unit is located above the projection target unit. The projection device according to claim 1 .

Images