Lens meter for measuring refractive power distribution

Details Lens meter for measuring refractive power distribution Lens meter for measuring refractive power distribution

2006-01-09

2009-02-03

Chowdhury, Tarifur (Department: 2886)

Optics: measuring and testing

Lens or reflective image former testing

Reexamination Certificate

active

07486389

ABSTRACT:
A lens meter having a simple configuration, which is capable of precisely measuring optical characteristics such as refractive power distribution in a wide range of a subject lens to be measured at a time. The lens meter has a projection unit which projects a measurement light bundle, a projection lens which projects the measurement light bundle from the projection unit onto the subject lens placed on an optical axis of the projection lens, a diaphragm having an aperture disposed between the projection unit and the projection lens, and a two-dimensional photodetector which photo-receives the measurement light bundle passed through the subject lens after passed through the aperture of the diaphragm and the projection lens, and wherein the projection unit forms a target pattern, and the aperture of the diaphragm is disposed at a front focal point of the projection lens.

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Hori et al., “Application of Diffraction Optical Element to Measurement,” Optical Alliance, Japan Industrial Publishing Co., Ltd., Tokyo pp. 36-39, Nov. 1998 w/translation.

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