Optics: measuring and testing – Lens or reflective image former testing – Focal length measuring
Patent
1986-02-28
1988-03-15
Rosenberger, R. A.
Optics: measuring and testing
Lens or reflective image former testing
Focal length measuring
356129, G01B 900
Patent
active
047309245
ABSTRACT:
Lens meter and method of measurement of progressive multifocal lens using the same which is able to set the amount of movement of the lens and to simply position a far- or near-distance refraction characteristics-measuring portion of a progressive multifocal lens. In accordance with the method the optical center of a lens is first found from measurement employing the lens and using the optical center as point of origin, the lens is moved by a distance up to the far-distance refraction characteristics measuring portion and the near-distance refraction characteristics measuring portion of the lens mentioned by the lens manufacturer, so as to effect alignment with the measurement optical axis of the lens meter, thereby measuring the refraction characteristics of each measuring portion.
REFERENCES:
patent: 3492075 (1970-01-01), Davis
patent: 3618271 (1971-11-01), Martiros
patent: 4330203 (1982-05-01), Oppenheim et al.
Allard Henri
Drummond Robert
Ikezawa Yukio
Villeneuve Charles P.
Cooper Crystal D.
Rosenberger R. A.
Tokyo Kogaku Kikai Kabushiki Kaisha
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