Optics: image projectors – Lens support – Lens position adjustable
Reexamination Certificate
1999-08-05
2001-02-20
Dowling, William (Department: 2851)
Optics: image projectors
Lens support
Lens position adjustable
C353S119000
Reexamination Certificate
active
06190015
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a liquid crystal display (LCD) projector with a lens protecting device capable of protecting and positioning lens. In addition, particularly to a lens-protecting device that not only properly positions the lens in a projecting location when the LCD projector is operating but also efficiently protects the lens when the lens is shaded.
2. Description of the Prior Art
For liquid crystal display (LCD) projector, it is necessary to adjust focal length of LCD projector by lens. There are two categories of configuration of LCD projector:
First category, light from liquid crystal panel directly propagates through lens onto screen.
Second category, both lens and mirror are used to adjust focal length and change propagating direction of light.
No matter how, both categories having some unavoidable advantages. For the first category, it is impossible to adjust projecting direction/angle of LCD projector without rotating LCD projector, and it is not convenient for user. For the second category, though projecting direction/angle of LCD projector can be changed without rotating LCD projector, but popular configurations of the category not only are complicated and non-impact, but also is not convenient for user to adjust locations of both lens and mirror. Moreover, owing to the fact that for popular configuration of LCD projector both mirror and lens are not properly protected when LCD projector does not operate, the risk that both lens and mirror are dirty and scared is increased.
Therefore, it is desired to develop a lens protecting device capable of protecting both lens and mirror when LCD projector does not operate. Beside, it also is important for the lens protecting device that properly place both lens and mirrors in proper locations such that LCD projector can properly operate.
SUMMARY OF THE INVENTION
It is the main objective of the present invention to mitigate and/or obviate these previously described disadvantages in the manner set forth in the following description of these preferred embodiments.
A primary object of the present invention is to provide a lens protecting device for a LCD projector which protect lens with a cover, a top housing, a bottom housing, an actuating device, a mirror and several springs. Where bottom housing is connected to the LCD projector and the mirror is fixed in the cover. Moreover, top housing and bottom housing are connected by a plurality of springs and the lens is secured in the top housing.
Another objective of the present invention is to provide a lens protecting device which change projecting direction/angle of LCD projector without rotating the LCD projector. Moreover, when the LCD projector is operating then the lens is properly positioned in a projecting location, and when the lens is shaded the lens is efficiently protected.
The mechanism of the provided invention can briefly illustrated by two following description.
First, the distance between both housing is adjustable by these springs and is adjusted to change location of lens such that lens is proper protected inside the LCD projector when LCD projector does not operate and is located in a proper position to propagate light when LCD projector is operating.
Second, because propagating direction/angle of light is changed by the mirror when light propagates through lens, the invention provides a convenient method to adjust projecting direction of LCD projector.
Third, because cover properly covers the top housing and lens, lens is protected by the cover when the LCD projector does not operate and then some convenient disadvantages such as dirty and scrape are protected.
REFERENCES:
patent: 4968134 (1990-11-01), Shimizu et al.
patent: 5321450 (1994-06-01), Shapiro et al.
patent: 5639152 (1997-06-01), Nelson
patent: 5642927 (1997-07-01), Booth et al.
patent: 5669688 (1997-09-01), Baar et al.
Lu Ho
Tsai Willy
Bacon & Thomas
Dowling William
Mustek Systems Inc.
LandOfFree
Liquid crystal display projector with a lens shading device... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Liquid crystal display projector with a lens shading device..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Liquid crystal display projector with a lens shading device... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2562086