Method and apparatus for measuring eccentricity of aspherical le

Details Method and apparatus for measuring eccentricity of aspherical le Method and apparatus for measuring eccentricity of aspherical le

1994-07-26

1996-08-20

Gonzalez, Frank

Optics: measuring and testing

Lens or reflective image former testing

Optical center, cylinder axis, or prism measuring or...

G01B 900

Patent

active

055483968

ABSTRACT:
In a method and an apparatus for measuring eccentricity of an aspherical lens, a detected lens as the aspherical lens is supported by a holding device and is rotated by a driving device around a rotating axis approximately conforming to an optical axis of the detected lens. Light is irradiated from a light source to the detected lens through a beam splitter and an optical system. Light reflected on the detected lens is reversely transmitted through the optical system and is focused and formed as a spot image. A pressing face of an alignment adjusting device is arranged in a position separated from the optical axis by a radius of the detected lens. The pressing face pushes an outer circumferential edge of the detected lens deflected outward by rotating the detected lens. Thus, the pressing face moves the detected lens and coarsely adjusts a position of the detected lens by approximately conforming the optical and rotating axes to each other. Thus, the spot image of the reflected light can be formed on an image forming face. Another method and another apparatus for measuring eccentricity of an aspherical lens are also shown.

REFERENCES:
patent: 5349433 (1994-09-01), Iwane

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