Automatic lens meter

Details Automatic lens meter Automatic lens meter

1982-06-16

1985-08-13

Rosenberger, R. A.

Optics: measuring and testing

Lens or reflective image former testing

Focal length measuring

356127, G01B 900

Patent

active

045346453

ABSTRACT:
An automatic lens meter includes a first positive lens system, a second positive lens system having its forward focal plane coincident with the rearward focal plane of the first positive lens system, a pin-hole plate disposed in the forward focal plane of the second positive lens system, the optical axis of the first and second positive lens systems passing through the pin-hole of the pin-hole plate, four spot light source means disposed on the forward focus side of the first positive lens system, the four spot light source means being provided in a plane orthogonal to the optical axis and made conjugate with a predetermined position on the rearward focus side of the second positive lens system by the first and second positive lens systems, a lens to be examined being disposed at said predetermined position, a third positive lens system provided on the side opposite to the second positive lens system with respect to said predetermined position, light-receiving means disposed on the opposite side of the second positive lens system with respect to the third positive lens system, the light-receiving means producing a signal corresponding to the position, on the light-receiving surface of the light-receiving means, of an optical image corresponding to each of the four spot light source means, and converter means for converting the output signals of the light-receiving means into diopters D.sub.1, D.sub.2 and principal meridians axis degree .theta..

REFERENCES:
patent: 2640392 (1953-06-01), Freeman
patent: 3880525 (1975-04-01), Johnson
patent: 3981589 (1976-09-01), Spitzberg
patent: 4180325 (1979-12-01), Humphrey
patent: 4275964 (1981-06-01), Vassiliadis
patent: 4329049 (1982-05-01), Rigg et al.

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