Optics: measuring and testing – Lens or reflective image former testing – Focal length measuring
Patent
1983-11-10
1987-01-20
Rosenberger, R. A.
Optics: measuring and testing
Lens or reflective image former testing
Focal length measuring
356124, G01B 900
Patent
active
046377204
ABSTRACT:
A lens meter having a focusing indication system with divided-image registration focusing comprises a condenser lens, a target having a nondiffusing transmissive surface and a slit pattern thereon, an objective lens, a lens mount for supporting a lens to be examined, a projection lens, a screen, the arrangement being such that the distance of movement in unison of the condenser lens and the target in the direction of an optical axis is read to detect the degree of the lens supported on the lens mount, an aperture plate disposed in the vicinity of a front focal point of the condenser lens and movable with the condenser lens and the target in the direction of the optical axis, and at least two deflection prisms disposed in intimate contact with the slit pattern on the target and having bases extending across the slit pattern and substantially perpendicularly to each other.
REFERENCES:
patent: 4275964 (1981-06-01), Vassiliadis
patent: 4293199 (1981-10-01), Wada et al.
patent: 4400070 (1983-08-01), Isono et al.
patent: 4526427 (1985-07-01), Fantone
Aiura Hirochika
Hara Tadao
Shindo Osamu
Shirayanagi Moriyasu
Ashahi Kogaku Kogyo Kabushiki Kaisha
Cooper Crystal D.
Rosenberger R. A.
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