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Projection-type video display device

A technology of image display and projection, applied in projection devices, image communication, television, etc., can solve problems such as damage, poor impact resistance of projection lens, adverse effects on projection performance, etc., and achieve the effect of improving operability, simple operation and simple structure

Active Publication Date: 2009-06-10
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When the image is not projected in this type of projection display device, the projection performance will be adversely affected due to the adhesion of dust, etc., and the intrusion from the gap, etc., into the glass surface of the projection lens exposed from the opening on the front of the main cabinet.
In addition, the projection lens part is particularly poor in impact resistance, so when the device is moved, it will be damaged by some impacts such as collisions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] 0031

[0089] Refer below Figure 1 to Figure 4 , Embodiment 1 of the present invention will be described in detail.

[0090] 0032

[0091] figure 1 It is a perspective view of an embodiment of a liquid crystal projector as a projection-type image display device of the present invention viewed obliquely from above, figure 1 (a) in (a) shows the state which opened the opening part, and (b) shows the state which opened the opening part. in addition, figure 2 (a) and (b) are plan views, (c) and (d) are front views, (e) is a side view, (a) and (c) show the state with the opening closed, (b) and (d) ) indicates a state where the opening is open. image 3 means the above figure 2 The A-A' profile ~ E-E' profile.

[0092] 0033

[0093] In the main casing 1 of this liquid crystal projector, an opening 3 for the projection lens is formed so that the projection lens 2 is exposed on the left side near the front 1a, and an opening corresponding to the projection lens is ...

Embodiment 2

[0131] 0052

[0132] Figure 5 to Figure 9 Example 2 of the present invention is shown. In addition, the same code|symbol is used for the same component as Example 1, and the description is abbreviate|omitted.

[0133] 0053

[0134] In Embodiment 1, only the slide cover 7 is slid, but in Embodiment 2, the opening 3 for the projection lens and the opening 5 for operation are both opened and closed. The structures of the slide covers 70 are respectively held by holding mechanisms.

[0135] 0054

[0136] Such as Figure 5 As shown, the slide cover 70 made of a nearly L-shaped plate covers the slide cover seat 9 also made of a nearly L-shaped plate, and is configured to be freely slidable relative to the slide cover seat 9 .

[0137] 0055

[0138] Such as Image 6 As shown, the sliding cover 70 is formed along the sliding direction of the front cover part 70a, and a long groove part 10 with a nearly U-shaped opening; The elastic claw portion 11 protruding perpendicular to...

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Abstract

A projection-type video display device where a projection lens opening formed in a front face of a body case and an operation opening formed in a surface adjacent to the body case are protected against dust and impact to protect a projection lens portion against them. The projection-type video display device displays video by modulating light from a light source based on a video signal and projecting the modulated light through a projection lens (2) exposed from the opening (3) in the front face (1a) of the body case. An operation member (adjustment dial (4)) for adjusting the zoom, focus, etc. of the projection lens (2) is exposed from the operation opening (5) formed in the surface (upper surface (1b)) adjacent to the front face (1a) of the body case. Also, an open / close mechanism (slide cover (7) etc.) for opening and closing both the projection lens opening (3) and the operation opening (5) is provided in the video display device.

Description

technical field [0001] 0001 [0002] The present invention relates to a projection type video display device such as a liquid crystal projector that modulates light emitted from a light source based on a video signal and projects it through a projection lens exposed through an opening in the front of a main cabinet to display a video. Background technique [0003] 0002 [0004] When no image is projected in this type of projection display device, the projection performance will be adversely affected due to the adhesion of dust and the like and entry from gaps and the like into the glass surface of the projection lens exposed from the opening in the front of the main cabinet. In addition, the projection lens part is particularly poor in impact resistance, so when the device is moved, it may be damaged by some impacts such as collisions. [0005] 0003 [0006] For this reason, a cap-type cover is fitted to the front end of a conventional projection lens, and an opening thro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/14G02F1/13G03B21/00H04N5/74
Inventor 栗田龙博铃木创千野洋冈崎昌二猿渡俊弘
Owner SANYO ELECTRIC CO LTD
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