Hand-held lens meter

Details Hand-held lens meter Hand-held lens meter

1981-02-24

1983-10-18

Arnold, Bruce Y.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

356125, G01B 900

Patent

active

044102674

ABSTRACT:
A hand-held lens meter including first and second optical systems mounted in a substantially Y-shaped hand-holdable body is disclosed. The first optical system includes a target, a lens rest and an objective lens. The target is slidably mounted in a grip portion of the lens meter body while the two optical systems are mounted in the upper legs thereof. The second optical system includes a relay lens, a focusing screen, an eyepiece lens and first and second reflecting surfaces which may be consituted either by first and second mirrors or a pentagonal prism. A prism is provided preferably as the reflecting surface of the first optical system with the prism having an optical path length longer than the outside diameter of the objective lens. The target is slidably moved along the optical axis in response to rotation of a power-measuring dial which is calibrated in terms of the powers of lenses to be measured.

REFERENCES:
patent: 3002285 (1961-12-01), Wright

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