Optics: measuring and testing – Lens or reflective image former testing – For optical transfer function
Patent
1984-07-20
1987-02-10
Rosenberger, R. A.
Optics: measuring and testing
Lens or reflective image former testing
For optical transfer function
356127, G01B 900
Patent
active
046419640
ABSTRACT:
An apparatus which comprises a collimating lens, light source means for selectively forming light sources in two positions on the optical axis of the collimating lens, means for defining the position of the lens to be inspected opposite to the light source with respect to the collimating lens, a mask plate having translucent or opaque areas symmetrical to the optical axis, a relay lens for placing the mask plate at a position conjugate with the lens position, an imaging lens positioned opposite to the mask plate with respect to the relay lens, and photoelectric converting means for producing image signals corresponding to the positions, in a plane perpendicular to the optical axis, of the image of the translucent or opaque areas of the mask plate formed by the imaging lens.
REFERENCES:
patent: 4275964 (1981-03-01), Vassiliadis
patent: 4329049 (1982-05-01), Rigg et al.
patent: 4410268 (1983-10-01), Tamaki
Gonda Tsunemi
Mitani Kiyoharu
Mizutani Hideo
Morohashi Kazuo
Yamada Kenji
Nippon Kogaku K. K.
Rosenberger R. A.
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