Optics: measuring and testing – Lens or reflective image former testing – For optical transfer function
Patent
1994-09-27
1997-06-10
Pham, Hoa Q.
Optics: measuring and testing
Lens or reflective image former testing
For optical transfer function
G01M 1100
Patent
active
056381689
ABSTRACT:
A lens evaluating device for measuring the optical transfer function of the lens under evaluation for evaluating the lens. The lens evaluating device includes an exposure light source, a converging lens for converging a light beam radiated from the exposure light source at a point, a characteristics evaluating pattern onto which the light beam outputted from the converging lens is converged by the lens under evaluation to form an image on it, a detection unit for receiving a return light beam having scanned the characteristics evaluating pattern via the lens under evaluation for detecting changes in reflection intensity of the return light beam, and an analysis unit for executing frequency analysis of the detected results from the detection unit for measuring the optical transfer function. The results of detection by the detection unit are subjected to a frequency analysis using a spectrum analyzer for measuring the optical transfer function of the lens under evaluation for evaluating the lens. An exposure light source includes a first resonator and a second resonator. The first resonator has a laser medium illuminated by an excited light radiated by an exciting light source and a first non-linear optical crystal device for wavelength-converting the light beam radiated from the laser medium. The second resonator has a second non-linear optical crystal device for wavelength-converting a light beam radiated from the first resonator.
REFERENCES:
patent: 3447874 (1969-06-01), Back
patent: 3519358 (1970-07-01), Kuttner et al.
patent: 4060328 (1977-11-01), Flynt
patent: 4772120 (1988-09-01), Pointeau
patent: 5321493 (1994-06-01), Kamon
Kubota Shigeo
Oka Michio
Pham Hoa Q.
Sony Corporation
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