Optics: measuring and testing – Lens or reflective image former testing – For optical transfer function
Patent
1994-06-29
1995-03-07
Pham, Hoa Q.
Optics: measuring and testing
Lens or reflective image former testing
For optical transfer function
356127, G01B 900
Patent
active
053963245
ABSTRACT:
A lens meter including an illumination light source for illuminating a measurement target, a target projection optical system for projecting the measurement target onto an inspected lens, an observation optical system for observing a focused state of the projected target image and target moving device for moving the measurement target in an optical axis direction or the like to thereby measure a refracting power of the inspected lens on the basis of an amount in which the measurement target is moved in the optical axis direction. This lens meter includes a lens holder for holding the inspected lens substantially parallel to a plane on which the lens meter is installed, and a reflection system optical element for reflecting a measurement light passed through the inspected lens even times so that the measurement light is introduced into the observation optical system.
REFERENCES:
patent: 2723594 (1955-11-01), Lueck
patent: 4123163 (1978-10-01), Chace et al.
patent: 4149801 (1979-04-01), Volk
patent: 4247200 (1981-01-01), Nohda et al.
patent: 4410267 (1983-10-01), Shindow et al.
patent: 4564291 (1986-01-01), Yoshino et al.
Kurachi Mikio
Murakami Yasuhisa
Nozawa Noritsugu
Nidek Co. Ltd.
Pham Hoa Q.
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