Projection type lensmeter

Details Projection type lensmeter Projection type lensmeter

1980-12-10

1986-01-14

Rosenberger, R. A.

Optics: measuring and testing

Lens or reflective image former testing

Focal length measuring

G01M 1102

Patent

active

045642915

ABSTRACT:
A projection type lensmeter in which the target image for measuring the refractive power of a lens is projected on a screen and the projected image is magnified and observed through a magnifying observation optical system including a collimator lens having a focal length f.sub.1 adapted to collimate light projected from the target image, and a projection lens having a focal length f.sub.2 adapted to project light from the target image to the screen. The magnifying observation optical system has an effective diameter .phi. and a magnification m.sub.2. The focal lengths f.sub.1 and f.sub.2, the effective diameter .phi., and the magnification m.sub.2 satisfy the following relations:

REFERENCES:
patent: 2640392 (1953-06-01), Freeman
patent: 4247200 (1981-01-01), Nohda et al.

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