Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
1999-01-12
2001-01-09
Parker, Kenneth (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C396S296000
Reexamination Certificate
active
06172724
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a liquid crystal display device for use in a camera finder, in particular to a liquid crystal display device capable of displaying constant normal information and information needed in photographing operation.
2. Description of the Related Art
In general, there have been known a liquid crystal display device for use in a camera finder, particularly for use in a lighting type finder apparatus, such as that disclosed in Japanese Unexamined Patent Publication Nos. 57-173824 and 63-128331.
With a lighting type finder apparatus employing the above mentioned liquid crystal display device, since a target mark of distance measurement may be displayed by a liquid crystal, there is not any inconvenience when responding to a release signal to display a target mark. However, if a target mark is to be displayed constantly, the driving of liquid crystal will cause a consumption of electric energy, resulting in a problem that buttery inserted therein will be used up too soon.
On the other hand, if a liquid crystal display plate is a glass plate on which a target mark has been printed, a constant displaying does not cause any electric consumption. However, since the target mark can only be seen through a polarizing plate, there is a problem that such target mark can not be seen clearly.
SUMMARY OF THE INVENTION
is an object of the present invention to provide an improved liquid crystal display device for use in a camera finder, which allows a user to clearly and constantly see a target mark of distance measurement, and is able to avoid an electric consumption which is otherwise unavoidable for driving the liquid crystal.
In order to solve the above problem, according to the present invention, there is provided an improved liquid crystal display device for use in a camera finder, said display device being capable of displaying a predetermined information within an image of a photographing object and in the vicinity of said image, characterized in that said liquid crystal display device is formed by a liquid crystal display plate and at least one polarizing plate, said liquid crystal display plate is provided with an information constantly displayed and an information needed only at a time of performing a photographing operation, the at least one polarizing plate is formed with a notch corresponding to the information constantly displayed.
Further, with the liquid crystal display device of the present invention, it is possible that only one side of the above liquid crystal display plate is provided with a polarizing plate, alternatively, both sides of the liquid crystal display plate are provided with polarizing plates, at least one polarizing plate is formed with a notch corresponding to the information constantly displayed on the liquid crystal display plate.
With the use of the present invention, a camera user is allowed to peep into the finder to constantly observe a predetermined information such as a target mark in the liquid crystal display device, without consuming any electric energy. Further, during a process of photographing operation, since the liquid crystal display device is driven, it is possible for a user to observe all of the displayed information by peeping into the finder.
REFERENCES:
patent: 4435046 (1984-03-01), Nishimura
patent: 4465355 (1984-08-01), Murakami et al.
patent: 4514920 (1985-05-01), Shafir et al.
patent: 4519679 (1985-05-01), Horikiri et al.
patent: 57-173824 (1982-10-01), None
patent: 63-128331 (1988-05-01), None
Arnold Bruce Y.
Arnold International
Fuji Photo Optical Co., Ltd.
Parker Kenneth
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