Optical displacement detector including a displacement member's

Details Optical displacement detector including a displacement member's Optical displacement detector including a displacement member's

1990-09-19

1991-12-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023116, 250237G, 356374, G01D 534

Patent

active

050737104

ABSTRACT:
An apparatus for optically detecting displacement. The light source is provided for emitting a coherent primary light. A displacement member is disposed to undergo a displacement transversely of the primary light to receive the primary light on its face. The displacement member has on its face a diffractive pattern effective to diffract the primary light and a holographic lens pattern effective to converge the primary light to thereby convert the primary light into a secondary light. A detector is receptive of the secondary light to detect optically the displacement of the displacement member.

REFERENCES:
patent: 3153111 (1964-10-01), Barber et al.
patent: 3879136 (1973-07-01), Takeda
patent: 4079252 (1978-03-01), Brake
patent: 4218615 (1978-10-01), Zinn, Jr.
patent: 4528448 (1982-05-01), Doggett
patent: 4559524 (1985-12-01), Suzuki
patent: 4629886 (1984-03-01), Akiyama et al.
patent: 4668862 (1985-10-01), Waibel
patent: 4680466 (1987-07-01), Kuwahara et al.
patent: 4700062 (1987-10-01), Ernst
patent: 4823001 (1989-04-01), Kobayashi et al.

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