Lens meter

Details Lens meter Lens meter

2007-06-12

2007-06-12

Lauchman, Layla (Department: 2877)

Optics: measuring and testing

Lens or reflective image former testing

C356S125000

Reexamination Certificate

active

11090202

ABSTRACT:
A lens meter for measuring optical characteristics of a subject lens to be measured includes at least three light sources for measurement, a projecting lens which projects measurement light bundles from the light sources onto the subject lens placed on a projecting-lens optical axis, a diaphragm having an aperture disposed at an anterior focal point of the projecting lens between the light sources and the projecting lens, and a two-dimensional photodetector photo-receiving the light bundles passing through the subject lens after passing through the aperture of the diaphragm and the projecting lens without the use of an image forming optical system, and the projecting lens is disposed so that the light sources is conjugate with the photodetector in a case where the subject lens with a specific diopter in the vicinity of 0D or a frequently-used specific diopter is placed on the optical axis.

REFERENCES:
patent: 5173739 (1992-12-01), Kurachi et al.
patent: 5231460 (1993-07-01), Kohayakawa
patent: 5432596 (1995-07-01), Hayashi
patent: 6221540 (2001-04-01), Onoda et al.
patent: A 4-66834 (1992-03-01), None
patent: A 9-33396 (1997-02-01), None
patent: A 11-125581 (1999-05-01), None
Hori et al., “Application of Diffraction Optical Element to Measurement,” Optical Alliance, Japan Industrial Publishing Co., Ltd., Tokyo pp. 36-39, 1998.

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