Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1985-06-10
1987-09-08
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250236, 350 68, G01N12186
Patent
active
046926291
ABSTRACT:
In an optical measuring device which comprises a polygonal rotary mirror for reflecting an incident light beam into a rotary scanning light beam, a collimator lens for converting the rotary scanning light beam into a parallel scanning light beam and a light receiving element for detecting bright and dark portions of the parallel scanning light beam, which has scanned a work to be measured, and a time duration of the dark portion or the bright portion is detected, which has been generated by the obstruction of a part of the parallel scanning light beam by the work, to thereby determine a dimension of the work, the collimator lens is made to be an f.theta. lens having such a spherical aberration that a light beam incident from the outlet side of the collimator lens toward the polygonal rotary mirror in parallel to the optical axis of the lens intersects the optical axis of the lens at a position shifted from a focal point on the inlet side to the outlet side by .DELTA., on the inlet side, so that the influence on the measuring error due to a relative displacement of the reflecting point of the polygonal rotary mirror can be minimized.
REFERENCES:
patent: 3517202 (1970-06-01), Kennedy
patent: 3668984 (1972-06-01), Rosin
patent: 3853406 (1974-12-01), Zanoni
patent: 3961838 (1976-06-01), Zanoni
patent: 3973833 (1976-08-01), Lawson
patent: 4277128 (1981-07-01), Kawamura
patent: 4318583 (1982-03-01), Goshima et al.
Cooper Crystal D.
Mitutoyo Mfg. Co. Ltd.
Nelms David C.
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