JP2009236957A - Rear-projection display device and game machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To constitute a rear-projection display device for projecting projection light from the rear side of a screen in a compact form with reduced depth and height. <P>SOLUTION: The device includes a screen 5, a first reflecting surface 3 provided on the rear side of the screen 5, a projector 2 provided on the rear side of the first reflecting surface 3, and a light guide part 4 for guiding projection light emitted from the projector 2 to the first reflecting surface 3. The projection light emitted from the projector 2 is turned around an end of the first reflecting surface 3 and guided to the first reflecting surface 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rear projection display device in which a projection device is installed on the rear side of a screen on which an image is projected.

  2. Description of the Related Art Conventionally, a rear projection apparatus is known in which a projection apparatus is installed on the back side of a screen on which a projection image is projected and the projection image is displayed from the back side of the screen. However, when a projection device is simply installed on the back side of the screen and a projection image is projected on the screen, it is necessary to provide a large space on the back side of the screen, which makes the device large. Therefore, a rear projection device has been put into practical use in which a projection device is installed in the lower part on the back side of the screen and the screen is irradiated with projection light from an oblique direction to reduce the distance on the back side between the projection device and the screen. Yes. However, even in this case, since the projection apparatus is installed below the screen, the entire projection apparatus requires a large space in the vertical direction.

  Patent Document 1 describes a configuration in which a plane mirror is provided on the back side of a screen and a projector device is installed on the back side of the plane mirror in order to make the rear projection device more compact.

  This will be described more specifically with reference to FIG. 5 (FIG. 1 of Patent Document 1). The rear projection display device 52 includes a screen unit 57, a first reflection surface 54 installed on the back side of the screen unit 57, a third reflection surface 56 installed on the back side of the first reflection surface 54, and a screen. The second reflection surface 55 installed on the lower back surface of the unit 57, the small projector device 51 installed on the back surface of the third reflection surface 56, and a housing for housing these. An opening 53 is formed at the center of the third reflecting surface 56. The first reflection surface 54 is a transflective reflection surface, and the transmittance varies depending on the incident angle of light.

The projection light emitted from the projector device 51 passes through an opening 53 formed at the center of the third reflecting surface 56 and is irradiated to the lower region of the first reflecting surface 54. The projection light reflected by the lower region of the first reflecting surface 54 is reflected by the second reflecting surface 55 and is irradiated again on almost the entire first reflecting surface 54 again. The projection light reflected again by the first reflecting surface 54 is reflected by the third reflecting surface 56, irradiated onto the screen unit 17, and displayed. By projecting the projection light from the small projector device 51 in this manner, the projector device 51 can be made extremely thin and a projection optical system free from optical aberrations can be constructed.
JP 2004-40619 A

  However, in the rear projection display device 52 of Patent Document 1, it is necessary to provide an opening 53 in the first reflecting surface 54, and the first reflecting surface 54 has different reflectivity depending on the incident angle of the projection light. Since this is a special configuration in which surface treatment is performed, the manufacturing cost increases. The first reflection surface 54 is a semi-transmissive reflection surface, and the projection light is reflected twice by the semi-transmission reflection surface, so that the light intensity of the projection light is greatly reduced. Further, the upper half area of the first reflecting surface 54 is irradiated with the projection light reflected from the second reflecting surface 55 and the projection light reflected from the third reflecting surface 56 in an overlapping manner. In addition, the lower half area of the first reflecting surface 54 is irradiated with the three projection lights of the projection light emitted from the opening 53 in an overlapping manner. For this reason, the projection light irradiated in a superimposed manner is displayed on the screen unit 57 in an overlapping manner, and the image quality of the projected image is degraded.

  In the present invention, the following means have been taken in order to solve the above problems.

  In the invention which concerns on Claim 1, it projects from the screen, the 1st reflective surface provided in the back side of the said screen, the projection apparatus provided in the back side of the said 1st reflective surface, and the said projection apparatus A rear projection display device including a light guide unit that guides projection light, wherein the projection light projected from the projection device is below the first reflection surface by the light guide unit. The rear projection display device is guided to the first reflecting surface so as to circulate, and is reflected on the first reflecting surface and projected onto the screen.

  In the invention according to claim 2, the projection light projected from the projection device is guided by the light guide unit so as to go around 180 ° or more around the lower end of the first reflecting surface. The rear projection type display device according to claim 1 is provided.

  According to a third aspect of the present invention, the light guide section includes a second reflection surface that reflects the projection light projected from the projection device, and the projection light that is reflected from the second reflection surface. The rear projection display device according to claim 1, wherein the rear projection type display device is configured by a third reflecting surface that reflects toward the reflecting surface.

  In the invention which concerns on Claim 4, the said light guide part was equipped with the 4th reflective surface installed between the said 2nd reflective surface and the said 3rd reflective surface, and was projected from the said projection apparatus. 4. The projected light is sequentially reflected on the second reflecting surface, the fourth reflecting surface, the third reflecting surface, and the first reflecting surface and projected onto the screen. It was set as the rear projection type display apparatus of description.

  The invention according to claim 5 includes the rear projection type display device according to any one of claims 1 to 4 and a game board in which a game member is installed in the game area, A gaming machine is characterized in that a part thereof is constituted by the screen of the rear projection type display device.

  The rear projection display device according to the present invention is provided with a first reflection surface on the back side of the screen, a projection device on the back side of the first reflection surface, and projection light projected from the projection device by the light guide. Is guided to the first reflecting surface so as to wrap around the lower end of the first reflecting surface. As a result, the depth direction of the screen and the vertical direction of the screen can be configured in a compact manner, and it is necessary to use a reflective surface provided with an opening or a reflective surface whose transmittance varies depending on the incident angle. Therefore, there is an advantage that it can be configured at low cost and the projected images do not overlap on the projection surface.

  Further, the projection light projected from the projection device is guided by the light guide portion so as to go around 180 ° or more around the lower end portion of the first reflection surface. Thereby, since the optical path length can be ensured, there is an advantage that a projected image with little distortion of the image can be projected.

  In addition, the light guide unit reflects the projection light projected from the projection device, and the third reflection surface reflects the projection light reflected from the second reflection surface toward the first reflection surface. It consisted of a reflective surface. Thereby, it has the advantage that the number of parts can be reduced and a lightweight and small rear projection display device can be configured.

  In addition, the light guide unit includes a fourth reflection surface installed between the second reflection surface and the third reflection surface, and the projection light projected from the projection device receives the second reflection surface, the second reflection surface, and the second reflection surface. The reflection surface 4, the third reflection surface, and the first reflection surface are sequentially reflected and projected onto the screen. Thereby, since the optical path length from the projection device to the screen can be made long, there is an advantage that a projection image with little distortion can be formed.

  Further, the rear projection display device and a game board in which game members are installed in the game area are provided, and all or a part of the game area is configured by the screen of the rear projection display device. Thereby, it has the advantage that the back side and the top, bottom, left, and right sides of the gaming machine can be configured compactly. When projecting onto the entire game area, etc., there is an effect that the background that does not normally change can be changed according to the situation.

  Hereinafter, the configuration of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional configuration diagram of a rear projection display device 1 according to an embodiment of the present invention. The rear projection type display device 1 includes a screen 5 that receives projection light from the back side and displays it on the front side, a first reflecting surface 3 provided on the back side of the screen 5, and the first reflecting surface 3. The projection device 2 for projecting projection light provided on the back side of the projector and the projection light projected from the projection device 2 are projected onto the first reflection surface 3 so as to go around the lower end O of the first reflection surface 3. The light guide 4 is configured to guide light and a housing 9 that houses these members. The projection light emitted from the projection device 2 irradiates the first reflecting surface 3 by going around the lower end O of the first reflecting surface 3 by the light guide unit 4. The projection light reflected from the first reflecting surface is projected onto the screen 5 from the back side.

  Note that the screen 5 may have a rectangular shape or a circular shape. Similar to the screen 5, the first reflective surface 3 may have a rectangular shape or a circular shape. As shown in FIG. 1, the light guide 4 may be composed of two reflecting surfaces, that is, a second reflecting surface 6 and a third reflecting surface 7, or may be composed of a large number of reflecting surfaces. Good.

  Thus, since the screen 5, the first reflecting surface 3, and the projection device 2 are arranged so as to overlap, the rear projection display device 1 can be formed thin. Further, since the projection light projected from the projection device 2 is guided around the lower end portion of the first reflection surface 3, the height of the rear projection display device 1 can be reduced. Further, since a transflective reflecting surface is not used, the light use efficiency from the light source can be increased. Moreover, since it is not necessary to use a reflective surface in which an opening is formed or a reflective surface whose transmittance changes according to the incident angle, the manufacturing cost can be reduced. Further, since the projection light projected from the projection device 2 wraps around the lower end portion of the first reflection surface 3 and reaches the surface of the first reflection surface 3, the optical path length of the projection light can be ensured. The distortion of the projected image can be reduced.

  The light guide unit 4 includes a second reflecting surface 6 and a third reflecting surface 7. The projection light projected from the projection device 2 is reflected by the second reflecting surface 6 toward the third reflecting surface 7 and further reflected from the third reflecting surface 7 toward the first reflecting surface 3. . As described above, the light guide unit 4 guides the projection light projected from the projection device 2 to the first reflection surface 3 so as to wrap around the lower end portion O of the first reflection surface 3.

  FIG. 2 is a schematic diagram for specifically explaining the arrangement of the projection light 15 projected from the projection device 2 and each component. First, the optical path of the projection light 15 will be described. As shown in FIG. 2, the two outer edge optical paths P <b> 1 and P <b> 2 of the projection light 15 projected from the projection device 2 are bent by the second reflection surface 6, the third reflection surface 7, and the first reflection surface 3, respectively. And reaches the screen 5. For example, the outer edge optical path P <b> 1 passes from the second reflecting surface 6 toward the third reflecting surface 7 in a direction substantially perpendicular to the surface of the screen 5 and in the vicinity of the lower end O of the first reflecting surface 3. . Furthermore, the outer edge optical path P <b> 1 passes near the surface of the screen 5 from the third reflecting surface 7 toward the first reflecting surface 3. Further, the outer edge optical path P <b> 2 passes from the second reflecting surface 6 to the vicinity of the lower end portion of the third reflecting surface 7 and is bent in the vicinity of the lower end portion O of the first reflecting surface 3. That is, both of the two outer edge optical paths P1 and P2 go around 180 ° or more around the lower end portion O of the first reflecting surface 3 before reaching the first reflecting surface 3 from the projection device 2. Therefore, all of the projection light 15 projected from the projection device 2 is guided by the light guide unit 4 so as to be rotated by 180 ° or more around the lower end portion O of the first reflecting surface 3. Here, the wraparound angle of the projection light 15 refers to a rotation angle at which the traveling direction of the projection light 15 rotates with the lower end O of the first reflecting surface 3 as a reference position.

  Next, the arrangement of each component will be described. The first reflecting surface 3 is installed on the back side of the screen 5 and has an area approximately the same as the screen 5 or a larger area than the screen 5. The inclination angle θ1 between the first reflecting surface 3 and the surface of the screen 5 is set to an angle of 30 ° to 40 °. The first reflecting surface 3 is disposed so as to be close to one end portion of the screen 5 and separated from the other end portion. The inclination angle θ2 between the third reflecting surface 7 and the surface of the screen 5 is set to an angle of 40 ° to 50 °. One end of the third reflecting surface 7 is set close to the other end of the screen 5, and the other end of the third reflecting surface 7 is set apart from the screen 5 and the first reflecting surface 3. Has been.

  The projection device 2 is installed on the back side of the first reflecting surface 3. The projection light 15 projected from the projection device 2 is irradiated in a direction substantially parallel to the surface of the first reflecting surface 3 and away from the screen 5. The second reflecting surface 6 is installed on the opposite side of the screen 5 with respect to the surface of the first reflecting surface 3. The inclination angle θ3 between the first reflecting surface 3 and the surface of the screen 5 is set to an angle of 10 ° to 20 ° obtained by subtracting the inclination angle θ1 from the inclination angle θ2. That is, the screen 5 and the first to third reflecting surfaces 3, 6, and 7 are installed so that the relationship of the inclination angle θ 3 = θ 2 −θ 1 is substantially satisfied. Projection light 15 reflected from the second reflecting surface 6 toward the third reflecting surface 7 is substantially perpendicular to the surface of the screen 5.

  Note that a projector using a liquid crystal light valve element or a DMD (Digital Micromirror Device) element can be used as the projection device 2. As the first to third reflecting surfaces 3, 6, and 7, planar reflecting surfaces can be used. Moreover, it can replace with a plane type | mold and can use the reflective mirror which consists of a concave surface or a convex surface. The screen 5 uses a planar transmitted light scattering type that scatters transmitted light. Further, a curved transmitted light scattering type can be used instead of the flat type.

  FIG. 3 is a schematic configuration diagram of a rear projection display device 1 according to another embodiment of the present invention. The same portions or portions having the same function are denoted by the same reference numerals.

  As shown in FIG. 3, the rear projection display device 1 includes a screen 5 that receives projection light from the back side and displays it on the front side, a first reflecting surface 3 provided on the back side of the screen 5, The projection device 2 that projects the projection light provided on the back side of the first reflection surface 3, and the projection light projected from the projection device 2 wraps around the lower end O of the first reflection surface 3. The light guide unit 4 guides the projection light to the first reflecting surface 3 and a housing 9 that houses these members. The projection light emitted from the projection device 2 irradiates the first reflection surface 3 through the lower end portion O of the first reflection surface 3 by the light guide 4 and is reflected from the first reflection surface. Is projected onto the screen 5 from the back side.

  The light guide 4 includes a second reflecting surface 6, a fourth reflecting surface 8, and a third reflecting surface 7. The projection light projected from the projection device 2 is reflected on the second reflecting surface 6, the fourth reflecting surface 8, the third reflecting surface 7, and the first reflecting surface 3 in this order, and projected onto the screen 5. . Also in the present embodiment, in the light guide unit 4, the projection light projected from the projection device 2 wraps around the lower end portion O of the first reflection surface 3 and is guided to the first reflection surface 3. More specifically, all of the projection light projected from the projection device 2 is guided by the light guide unit 4 so as to be rotated by 180 ° or more around the lower end portion O of the first reflecting surface 3. The

  The configuration shown in FIG. 3 will be described more specifically. The first reflecting surface 3 is installed on the back side of the screen 5 and has an area approximately the same as the screen 5 or a larger area than the screen 5. The inclination angle θ1 between the first reflecting surface 3 and the surface of the screen 5 is set to an angle of 30 ° to 40 °. The first reflecting surface 3 is disposed so as to be close to one end portion of the screen 5 and separated from the other end portion. The inclination angle θ2 between the third reflecting surface 7 and the surface of the screen 5 is set to an angle of 40 ° to 50 °. One end of the third reflective surface 7 is close to the other end of the screen 5, and the lower end O, which is the other end of the third reflective surface 7, is from the screen 5 and the first reflective surface 3. It is installed so as to be separated.

  The projection light projected from the projection device 2 is irradiated in a direction substantially parallel to the surface of the first reflecting surface 3 and away from the screen 5. The second reflecting surface 6 is installed on the opposite side of the screen 5 with respect to the first reflecting surface 3. The inclination angle θ3 between the first reflecting surface 3 and the surface of the screen 5 is set to an angle of 10 ° to 20 °. The fourth reflecting surface 8 is installed with one end portion close to the end portion of the third reflecting surface 7 and the other end portion close to the second reflecting surface 6. The fourth reflecting surface 8 and the third reflecting surface 7 are installed so as to be substantially orthogonal. In other words, the inclination angle θ4 between the fourth reflecting surface 8 and the surface of the screen 5 is set to an angle of 40 ° to 50 °.

  Thus, since the screen 5, the first reflecting surface 3, and the projection device 2 are arranged so as to overlap, the rear projection display device 1 can be formed thin. In particular, the position of the second reflecting surface 6 constituting the light guide unit 4 can be installed close to the projection device 2. Therefore, the depth can be made thinner than the rear projection type display device 1 shown in FIG. In addition, since the projection light projected from the projection device 2 is guided around the lower end portion of the first reflection surface 3, the height of the rear projection display device 1 can be reduced. Further, since a transflective reflecting surface is not used, the light use efficiency from the light source can be increased. Moreover, since it is not necessary to use a reflective surface in which an opening is formed or a reflective surface whose transmittance changes according to the incident angle, the manufacturing cost can be reduced. Moreover, since the projection light projected from the projection device 2 wraps around the lower end portion of the first reflection surface 3 and reaches the surface of the first reflection surface 3, the optical path length of the projection light can be ensured. The distortion of the projected image can be reduced.

  In the embodiment described above, the projection direction of the projection light of the projection device 2 is set substantially parallel to the surface of the first reflecting surface 3, but the present invention is not limited to this. For example, in the embodiment shown in FIGS. 1 and 2, the projection light projected from the projection device 2 is projected in the direction perpendicular to the screen 5 and in the direction opposite to the screen 5, and is newly provided on the reflecting surface. Thus, the light may be reflected on the second reflecting surface 6. In this case, the light guide unit 4 shown in FIG. 1 includes a newly provided reflecting surface, a second reflecting surface 6, and a third reflecting surface 7. The light guide unit 4 shown in FIG. 3 includes a newly provided reflecting surface, a second reflecting surface 6, a fourth reflecting surface 8, and a third reflecting surface 7. In this configuration, the projection light projected from the projection device 2 is guided to the first reflection surface 3 by the light guide unit 4 so as to go around the end of the first reflection surface 3 by 270 ° or more. Thereby, since the optical path length can be secured longer, distortion of the projected image can be further reduced.

  FIG. 4 is a configuration diagram showing the gaming machine 10 according to the embodiment of the present invention. FIG. 4A is a schematic longitudinal sectional view of the gaming machine 10, and FIG. 4B is a schematic front view. The gaming machine 10 is provided with an operation panel 12 and a gaming board 13 when viewed from the front. A game area 11 is configured on the game board 13, and an effect section that outputs an effect is provided in the game area 11, and a nail that restricts the fall of the game ball is installed. The game board 13 in the game area 11 is composed of a screen 5 that scatters projection light from the back side to the surface side.

  The rear projection display device 1 is housed in the housing 9 of the gaming machine 10. The rear projection display device 1 includes a projection device 2, a light guide 4, a first reflection surface 3, and a screen 5 that constitutes part or all of the game board 13. The first reflecting surface 3 is provided on the back side of the screen 5, and the projection device 2 is provided on the back side of the first reflecting surface 3. The projection light projected from the projection device 2 is guided to the first reflection surface 3 by the light guide unit 4 so as to go around the end of the first reflection surface 3.

  Thereby, even when the rear projection display device 1 is housed, a small gaming machine 10 having a small depth and a low height can be configured. In addition, since it is not necessary to use a transflective type as a reflecting surface for reflecting the projection light, the light use efficiency can be increased. Moreover, since it is not necessary to provide an opening part and angle dependence as a reflective surface for reflecting projection light, cost can be reduced. Moreover, since the projection apparatus 2 can display a video image and an image, a gaming machine with a high production effect can be configured. In FIG. 4, the light guide 4 is configured by the second reflecting surface 6 and the third reflecting surface 7, but is not limited to this, and a larger number of reflecting surfaces can be used.

It is a typical block diagram of the rear projection type display apparatus which concerns on embodiment of this invention. It is a schematic diagram for demonstrating the optical path of the projection light of the rear projection type display apparatus which concerns on embodiment of this invention. It is a typical block diagram of the rear projection type display apparatus which concerns on embodiment of this invention. It is a typical block diagram of the game which concerns on embodiment of this invention. It is a block diagram of a conventionally well-known rear projection display device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rear projection type display apparatus 2 Projection apparatus 3 1st reflective surface 4 Light guide part 5 Screen 6 2nd reflective surface 7 3rd reflective surface 8 4th reflective surface 9 Case 10 Game machine

Claims (5)

A screen, a first reflecting surface provided on the back side of the screen, a projection device provided on the back side of the first reflecting surface, and a light guide unit for guiding projection light projected from the projection device A rear projection display device comprising:
The projection light projected from the projection device is guided by the light guide unit to the first reflection surface so as to wrap around the lower end of the first reflection surface, and the first reflection surface. A rear projection display device that is reflected and projected onto the screen.   The projection light projected from the projection device is guided by the light guide so as to go around 180 ° or more around the lower end of the first reflecting surface. The rear projection type display device described in 1.   The light guide unit reflects a projection light projected from the projection device, and a projection surface reflected from the second reflection surface toward the first reflection surface. The rear projection type display device according to claim 1, wherein the rear projection type display device is configured by three reflective surfaces.   The light guide includes a fourth reflection surface installed between the second reflection surface and the third reflection surface, and the projection light projected from the projection device is the second reflection surface. 4. The rear projection display device according to claim 3, wherein the projection is sequentially reflected on the screen, the fourth reflecting surface, the third reflecting surface, and the first reflecting surface and projected onto the screen.   5. A rear projection display device according to claim 1, and a game board in which a game member is installed in a game area, wherein all or part of the game area is the rear projection display apparatus. A gaming machine characterized by comprising a screen.

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