Examination apparatus for examining an object having a spheroida

Details Examination apparatus for examining an object having a spheroida Examination apparatus for examining an object having a spheroida

1993-07-29

1995-10-31

Sikes, William L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351211, 351212, 351221, 356376, A61B 310, A61B 3107, G01B 1124

Patent

active

054634300

ABSTRACT:
An examination apparatus for examining an object having a spheroidal reflecting surface provides a first index projecting optical system for projecting a first measuring index onto the object to be examined at a designated angle, a second index projecting optical system for projecting a second measuring index having a different optical distance from the first index onto the object at the designated angle, so that each reflected images of the first and second measuring index have a designated image height relationship therebetween when the object is placed at a designated working distance, and respective image height of reflected images of the first and second measuring index are detected by a detecting optical system with a photoelectric conversion apparatus, whereby whether the working distance between the object and the apparatus is right or not is judged by processing a signal detected by the photoelectric conversion apparatus.

REFERENCES:
patent: 4660946 (1987-04-01), Nakamura et al.
patent: 4764006 (1988-08-01), Hamano et al.
patent: 4917458 (1990-04-01), Matsumura
patent: 5212505 (1993-05-01), Penney
patent: 5302979 (1994-04-01), Maeda et al.

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