Active autofocusing type rangefinder optical system
First Claim
1. An active autofocusing type rangefinder optical system for cameras, which is provided separately from a photo-taking optical system, and in which an optical path-splitting means is disposed in an optical path of an objective optical system of said rangefinder optical system, a finger optical system in one optical path split by said splitting means and a range finding optical system in another optical path split by said splitting means, wherein:
- said range finding optical system includes a range finding element,an optical system located on the object side from said optical path-splitting means has a positive refracting power as a whole,an optical system extending from said optical path-splitting means to an intermediate image-forming surface of the finder optical system has one of a positive and negative refracting power as a whole, andan optical system located on the side of said range finding element from said optical path-splitting means has a positive refracting power as a whole.
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Accused Products
Abstract
The invention concerns an active autofocusing type rangefinder optical system that prevents a finder system and a light projection system from producing parallax and is capable of finding the distance of an object with high accuracy, in which an optical path-splitting means Bs is located somewhere in the optical path of the objective optical system thereof that is provided separately from a taking or photographic optical system, one of the optical path split by said splitting means being assigned to said finder optical system and the other to a range finding optical system, wherein a portion of the optical system located on the object side from said optical path-splitting means has a positive refracting power as a whole, a portion of the optical system extending from said optical path-splitting means to the intermediate image-forming surface of the finder optical system has a positive or negative refracting power as a whole, and a portion of the optical system located on the side of said range finding element from said optical path-splitting means.
108 Citations
5 Claims
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1. An active autofocusing type rangefinder optical system for cameras, which is provided separately from a photo-taking optical system, and in which an optical path-splitting means is disposed in an optical path of an objective optical system of said rangefinder optical system, a finger optical system in one optical path split by said splitting means and a range finding optical system in another optical path split by said splitting means, wherein:
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said range finding optical system includes a range finding element, an optical system located on the object side from said optical path-splitting means has a positive refracting power as a whole, an optical system extending from said optical path-splitting means to an intermediate image-forming surface of the finder optical system has one of a positive and negative refracting power as a whole, and an optical system located on the side of said range finding element from said optical path-splitting means has a positive refracting power as a whole. - View Dependent Claims (2, 3, 4, 5)
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Specification