JP2006220788A - Rear projection display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rear projection display capable of smoothly performing a lamp exchange work while recognizing the work with eyes by enabling a user to sufficiently recognize a lamp installation place when exchanging a lamp unit by the user even in an optical system in which an optical component including a lamp is arranged just rearward of a screen. <P>SOLUTION: In the rear projection display projecting light on the screen, a lamp base 7 for holding the lamp unit 16 includes a movable part 7a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to an apparatus for projecting an image on a screen using a reflecting mirror, and more particularly to a rear projection display.

In recent years, a rear projection display (a rear projection type projector device) has been proposed in which a light image projected from the back side of a screen member is viewed from the front side of the screen member.

Such a rear projection display has a feature that it has a large screen and a small depth and installation area as compared with a CRT display device. Examples of the structure of a rear projection display that employs an oblique incidence optical system are shown in FIG. 5, FIG. 6, FIG. 7, and FIG. 5 is an internal side view showing a state in which the lamp unit 16 is removed from the housing 1 of the device, FIG. 6 is an internal side view showing a state in which the lamp unit 16 is installed in the housing 1 of the device, and FIG. FIG. 8 is a perspective view showing the internal structure as seen from diagonally above the back, and FIG. 8 is a diagram showing the structure as seen from the back of the device.

In the above-described rear projection display structure having a device casing 1 and a front panel 2 called an escutcheon, a video output device 14 receives light from a lamp 9 configured in a lamp unit 16 housed in a lamp base 7. The image light 4 is reflected by the reflection mirror 13 and the ceiling reflection mirror 3 and projected toward the Fresnel lens 6 and the lenticular screen 5 constituting the screen. At this time, as shown in FIGS. 5 and 6, the angle Θ at which the optical axis 17 of the image light 4 enters the Fresnel lens 6 is less than 90 °. This is called an oblique incidence optical system. In this oblique incidence optical system, an image output device 14 for creating image light, a lamp unit 16 of a light source, and a lamp base 7 for holding it are shown in FIG. 5, FIG. 6, FIG. 7, and FIG. Furthermore, even if it is arranged directly behind the Fresnel lens 6 and the lenticular screen 5 constituting the screen, that is, in the vertical direction of the device main body, it does not block the video light 4 even if it is arranged at a position overlapping the display range of the screen surface. Placement is possible. In this structure, the lamp unit 16 (the lamp unit 16 is composed of the lamp 9, the lamp fixing housing 10, etc.) has a specification that can be replaced by the user. That is, as shown in FIG. 5, the lamp unit 16 is inserted from the front of the display and is stored as indicated by the arrow D. For example, the lamp fixing flange portion 10c, the lamp base flange portion 7d, the lamp fixing flange portion 10d, and the lamp The base flange portion 7e is fixed with screws 15a and 15b, and the lamp unit 16 is housed and fixed as shown in FIG.

However, in the above-described technique, as shown in FIGS. 5, 6, 7, and 8, the video output device 14 that creates video light, the lamp unit 16 of the light source, and the lamp base 7 that holds the same are described above. Therefore, when the user tries to replace the lamp unit 16 from the front of the device, the user is obstructed by the screen unit and cannot confirm the lamp base 7, and the lamp unit 16 while visually checking the lamp unit 16. Cannot be exchanged. For this reason, it is necessary to replace the lamp unit 16 by groping. As described above, in the rear projection display employing the oblique incidence optical system as described above, when the lamp unit 16 is replaced, the screen portion becomes an obstacle, and the storage arrangement of the lamp unit 16 as described above is the replacement operation. It was a factor that significantly hindered the ease of doing this.

In principle, it is best to replace the lamp on the front side of the equipment. This is because the back side of the device is often installed in close contact with the wall, and in this case, when replacing the lamp, it is necessary to keep the space for replacing the lamp by separating the device from the wall. . Also, on the side surface side, various things are often placed on the side surface of the device. For this reason, when exchanging the lamp, it is necessary to leave these packages and secure a space for exchanging the lamp. Therefore, it is best that lamp replacement can be performed on the front side of the equipment.

As a proposal regarding such lamp replacement, there is a proposal that the lamp unit is replaced from the front by removing a member (front panel) that obstructs the lamp replacement, although the storage location of the lamp unit is different from that described above (Patent Document 1). ).
JP 09-098358 A

However, the above proposal relates to a configuration in which the lamp unit is not disposed immediately behind the screen, that is, at a position overlapping the display range of the screen surface in the vertical direction of the device body. Accordingly, there has not yet been proposed a lamp replacement operation that can be easily performed on the front side of the device in the configuration in which the lamp unit is housed and arranged in the places shown in FIGS.

In view of the above problems, a rear projection display according to the present invention is a rear projection display that projects light onto a screen, and a lamp base for holding a lamp unit has a movable portion. The movable part is a part that can be rotated by a hinge structure or the like, or a part that can be translated by a slide structure or the like.

In the present invention, the movable portion may be configured to be movable while holding the lamp unit so that the lamp unit can be replaced from the front of the rear projection display when the lamp unit is replaced (for example, below the device body). The lamp base is arranged so as to hold the lamp unit at a position overlapping the display range of the screen surface in the vertical direction of the device body, and the optical axis of the image light is the screen. An oblique incidence optical system that is incident at an angle of less than 90 ° with respect to the surface may be provided.

As described above, according to the present invention, even in an optical system in which an optical component including a lamp is disposed immediately behind the screen, the lamp base has a movable part, so that the user can When replacing the lamp, it is possible for the user to check the lamp installation location sufficiently, and the lamp replacement work can be performed smoothly while visually checking.

Embodiments of the present invention will be described below. 1 and 2 are side views for explaining a first embodiment of the present invention, and FIG. 3 is a perspective view for explaining the present embodiment. 1 and 2, the same reference numerals as those in FIGS. 5 to 8 denote the same components. The different parts are a lamp base lid 7a, a lamp base lid convex portion 7b, a lamp base lid boss 7c, a rotating shaft 8, a lamp fixing housing hook portion 10a, a lamp fixing housing flange portion 10b, a screw 11, and the like.

In the configuration of FIG. 1, when fixing the lamp unit 16, the front panel (not shown) that is detachable or openable is removed or opened, and the opening 20 (for example, 150 mm × 200 mm where a hand can easily enter) The lamp unit 16 is inserted in the A direction from the front side of the device through the opening of the degree, and the lamp fixing case hook part 10a is hooked on the lamp base cover convex part 7b, and the lamp fixing case flange part 10b is attached to the lamp base cover boss 7c. Is fixed with screws 11. Next, the lamp base lid 7a is rotated in the B direction about the rotation shaft 8. Then, the lamp base cover 7 a is fixed to the lamp base 7 with a decorative screw 12 or the like in the use or storage state shown in FIG. When removing the lamp unit 16 from the lamp base 7, the reverse operation may be performed. In this configuration, the lamp unit 16 can be fixed and removed while being at the same level as the opening 20, or a screw or the like may be handled at the front side of the lamp base 7. The fixing work and the removing work can be performed while looking at 16, and even when the lamp unit 16 is not visible, the work can be performed relatively easily because the work is performed in front.

In the above configuration, the lamp base lid 7a is eliminated, and the lamp fixing housing hook 10a is hooked on the rotating shaft 8, and the lamp fixing housing flange 10b is directly fixed to the lamp base 7 with a decorative screw or the like. You can also do it.

Next, FIG. 4 shows a second embodiment. 4, the same reference numerals as those in FIGS. 5 to 8 denote the same components. In this configuration, when the lamp unit 16 is fixed, the lamp unit 16 is inserted in the direction E from the front side of the device, and the lamp fixing housing hook portion 10a is hooked on the lamp base L-shaped lid convex portion 7g. The lamp fixing housing flange portion 10b is fixed to the L-shaped lid boss 7h with screws 11. Next, the lamp base L-shaped lid 7 f is slid in the F direction and stored in the lamp base 7. Finally, the lamp base L-shaped lid 7f is fixed to the lamp base 7 with a cosmetic screw (not shown) or the like. When removing the lamp unit 16 from the lamp base 7, the reverse operation may be performed. Even in this configuration, the lamp unit 16 can be fixed and removed while the lamp unit 16 is at the same level as the opening 20, or a screw or the like may be handled at the front side of the lamp base 7. The fixing work and the removing work can be performed while looking at 16, and even when the lamp unit 16 is not visible, the work can be performed relatively easily because the work is performed in front.

As the sliding structure, a rail structure or the like is used, and when the lamp base L-type lid 7f is slid downward to the position shown in FIG. 4, the lamp base L-type lid 7f is stopped by a stopper on the lamp base 7 side. Can be adopted. However, the lamp base L-shaped lid 7f to which the lamp unit 16 is fixed can be removed from the slide structure on the lamp base 7 side or can be fitted into the slide structure. In such a case, the fixing operation of the lamp unit 16 to the lamp base L-type lid 7f and the detaching operation therefrom can be performed outside the device.

FIG. 1 is a side view illustrating a state in which the lamp unit 16 according to the first embodiment of the present invention is removed. FIG. 2 is a side view illustrating a state in which the lamp unit 16 according to the first embodiment of the present invention is housed. FIG. 3 is a perspective view for explaining the first embodiment of the present invention. FIG. 4 is a side view illustrating a state in which the lamp unit 16 according to the second embodiment of the present invention is removed. FIG. 5 is an internal side view showing a state in which an example lamp unit 16 is removed according to a conventional concept. 6 is an internal side view showing a state where the lamp unit 16 of the example of FIG. 5 is installed. FIG. 7 is a perspective view showing the structure of the example of FIG. FIG. 8 is a rear view showing the structure of the example of FIG.

Explanation of symbols

7 ... Lamp base 7a ... Lamp base lid (movable part)
7f ... Lamp base L-shaped lid (movable part)
9 ... Lamp 16 ... Lamp unit 17 ... axis of image light

Claims (4)

A rear projection display for projecting light onto a screen, wherein a lamp base for holding a lamp unit has a movable part. The rear projection display according to claim 1, wherein the movable portion is configured to be movable while holding the lamp unit so that the lamp unit can be replaced from the front of the rear projection display when the lamp unit is replaced. The rear projection display according to claim 2, wherein the movable part is configured to be able to rotate or slide downward or upward of the apparatus main body while holding the lamp unit. The lamp base is disposed so as to hold the lamp unit at a position overlapping the display range of the screen surface in the vertical direction of the device body, and the optical axis of the image light is incident on the screen surface at less than 90 °. The rear projection display according to claim 1, further comprising an oblique incidence optical system.

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