Finder display apparatus
AssigneeMinolta Co., Ltd.
InventorsHiromu Mukai, Taro Shibuya
Life of this patent
Estimating the term…
Abstract
A finder display apparatus provides a display of information associated with the photographing within a finder field. The finder display apparatus has a reflecting surface, a polarizing plate and an electro-optical display device constituted by a twisted nematic liquid crystal arranged between the reflecting surface and the polarizing plate. The reflecting plate is provided to a Porro prism and has a polarization characteristic different by 90.degree. from the polarization characteristic of the polarizing plate.
Claims40
A finder display apparatus for providing a display within a finder field, said finder display apparatus being provided in a real-image-type finder optical system for obtaining an erecting image by use of a Porro prism, said finder display apparatus comprising:
- a reflecting surface provided to the Porro prism, said reflecting surface having a polarization characteristic;
- a polarizing plate having a polarization characteristic different by 90.degree. from the polarization characteristic of said reflecting surface;
- and
- an electro-optical display device constituted by a twisted nematic liquid crystal arranged between said reflecting surface and said polarizing plate.
A finder display apparatus for providing a display within a finder field, said finder display apparatus being provided in a bright frame inverted Galilean finder optical system, said finder display apparatus comprising:
- a semitransparent surface provided to a display prism, said semitransparent surface having a polarization characteristic, transmitting a subject image therethrough and directing a display content to an eyepiece;
- a polarizing plate having a polarization characteristic different by 90.degree. from the polarization characteristic of said semitransparent surface;
- and
- an electro-optical display device constituted by a twisted nematic liquid crystal arranged between said semitransparent surface and said polarizing plate.
A finder display apparatus for providing a display within a finder field in a single-lens reflex camera by arranging an electro-optical display device between two polarizing members, said finder display apparatus being arranged in a finder optical system, comprising:
- a focusing screen;
- a pentagonal roof prism;
- and
- a twisted nematic liquid crystal, which is used as said electro-optical display device, wherein said two polarizing members transmit therethrough only light having a predetermined polarization direction, and are arranged separately from said twisted nematic liquid crystal, and said twisted nematic liquid crystal is arranged between said focusing screen and said pentaprism.
A finder display apparatus for providing a display within a finder field by arranging an electro-optical display device between two polarizing members, said finder display apparatus being arranged in a finder optical system and including a prism, comprising:
- a twisted nematic liquid crystal is used as said electro-optical display device, and wherein said two polarizing members transmit therethrough only light having a predetermined polarization direction, and are arranged separately from said twisted nematic liquid crystal.
A finder display apparatus comprising:
- a finder optional system of real image type including an element for erecting an image;
- an electro-optical device arranged on an optical path of said finder optical system, said electro-optical device including:
- a display element for displaying photographic information so as to be viewed together with a subject image;
- and a pair of polarizing members arranged one on one side and the other on the other side of said display element for making the photographic information visible,
- wherein at least one of the pair of polarizing members constituting said electro-optical device is separated from said display element.
A finder display apparatus comprising:
- a finder optical system of virtual image type;
- an electro-optical device arranged on an optical path of said finder optical system, said electro-optical device including:
- a display element for displaying photographic information so as to be viewed together with a subject image;
- and a pair of polarizing members arranged one on one side and the other on the other side of said display element for making the photographic information visible,
- wherein at least on of the pair of polarizing members constituting said electro-optical device is separated from said display element.
Dependencies are inferred from the claim text.