Optics: measuring and testing – Lens or reflective image former testing – For optical transfer function
Patent
1987-07-15
1988-11-29
Evans, F. L.
Optics: measuring and testing
Lens or reflective image former testing
For optical transfer function
351212, 351247, A61B 310, G01B 900
Patent
active
047877430
ABSTRACT:
A plurality of light sources are caused to impinge in predetermined directions onto an optical system to be inspected. The reflected beams from the optical system are received by two or more pairs of photoelectric converting elements and the radius of curvature of the above mentioned optical system is measured on the basis of the phase difference of the output signals between the photoelectric converting elements forming the respective pairs. The reflected beams are first converted into a slit shaped series of beams, the angle of inclination of each of which, to which to the scanning direction, is made in two or more different known angles. An output device emitting the discriminating signal of the angle of inclination of the beams is provided and the discriminating signal and phase difference inputted to an operating circuit to obtain a refractive power.
REFERENCES:
patent: 4572628 (1986-02-01), Nohda
patent: 4588270 (1986-05-01), Tamaki
Evans F. L.
Sun Hig-Tech Kabushiki Kaisha
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