Beam forming and collection lens assembly for laser scanner syst

Details Beam forming and collection lens assembly for laser scanner syst Beam forming and collection lens assembly for laser scanner syst

1987-06-18

1988-11-22

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

350432, 250566, 235472, B29D 1318

Patent

active

047867981

ABSTRACT:
A laser instrument of the kind used to detect light reflected from a target which is spaced from the laser instrument, includes a source laser for generating a laser high beam for transmission to the target and a bifocal lens assembly which is retro-directive in nature. The bifocal lens assembly is composed of a lens, and a mirror, much smaller in diameter than the lens, being attached to the lens for receiving and reflecting the laser light beam onto the optical axis of the lens. Respective small diverging and converging lens portions, formed on opposite sides of the lens and in alignment with its optical axis, expand and focus the received laser beam on the target. Respective large diameter converging lens portions, formed on opposite sides of the lens about the respective small diameter diverging and converging lens portions and in alignment with the optical axis of the lens, collect and focus on a light detector the light being reflected from the target. The lens assembly further includes a holder which releasably supports the lens in spaced relationship and aligns the light detector along the optical axis of the lens. Also, an optical bandpass filter is releasably supported by the holder between, and in spaced relationship to, the lens and light detector and along the optical axis of the lens.

REFERENCES:
patent: 3481672 (1969-12-01), Zoot
patent: 3991275 (1976-11-01), Bulthuis
patent: 3994008 (1976-11-01), Land et al.
patent: 4496831 (1985-01-01), Swartz et al.
patent: 4675531 (1987-06-01), Clark et al.
patent: 4678288 (1987-07-01), Lonsdale et al.
Amendment filed in Lonsdale application Ser. No. 06/604916, filed Apr. 27, 1984, now U.S. Pat. No. 4,678,288, 350/432.

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