Change-over shutter for light-wave range finder

Details Change-over shutter for light-wave range finder Change-over shutter for light-wave range finder

1983-04-18

1987-01-13

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

350315, 350314, G01C 308, G02B 522

Patent

active

046360689

ABSTRACT:
A change-over shutter for an optical range finder employs at least two slits for measurement light, one of which is employed during long distance measurements and the other of which includes a light reduction member and is employed for short distance measurements. The arrangement advantageously eliminates measurement error caused in short distance measurements due to light secondarily reflected from the light emitting element.

REFERENCES:
patent: 578147 (1897-03-01), Harrison
patent: 2734435 (1951-11-01), Leonardi
patent: 3500050 (1970-03-01), Hillman
patent: 3619058 (1971-11-01), Hewlett et al.
patent: 4101221 (1978-07-01), Schunck et al.
patent: 4165919 (1979-08-01), Little

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