Membrane type optical transducers particularly useful as...

Details Membrane type optical transducers particularly useful as... Membrane type optical transducers particularly useful as...

2005-06-14

2005-06-14

Smith, Zandra (Department: 2877)

Optics: measuring and testing

Shape or surface configuration

C356S445000

Reexamination Certificate

active

06906807

ABSTRACT:
An optical transducer includes a housing containing a light source and a light detector laterally spaced from the light source; and a deformable membrane mounted over the light source and light detector such that an inner surface of the membrane reflects light from the light source to the light detector to produce, from the light detector, an output electrical signal modulated in accordance with the deformations of the membrane. The inner surface of the membrane has a small central region of high light reflectivity to maximize the output electrical signal produced by the deformations of the membrane, and a large outer region of lower light reflectivity to minimize noise in the output electrical signal produced by multi-reflection of light from the light source to the light detector. The membrane is preferably formed in its outer region with circular corrugations coaxial with each other and with the central region of high light reflectivity to increase the deformability of the central region.

REFERENCES:
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patent: 5262884 (1993-11-01), Buchholz
patent: 5771091 (1998-06-01), Paritsky et al.
patent: 5969858 (1999-10-01), Funatsu
patent: 6091497 (2000-07-01), Paritsky et al.
patent: 6239865 (2001-05-01), Paritsky et al.
patent: 6552328 (2003-04-01), Berlin et al.
patent: 198 35 947 (2000-02-01), None

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