Pyroelectric infrared sensor with different sized effective ligh

Details Pyroelectric infrared sensor with different sized effective ligh Pyroelectric infrared sensor with different sized effective ligh

1990-09-11

1992-04-14

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

H01L 310224

Patent

active

051050846

ABSTRACT:
A pyroelectric infrared sensor includes a package having a light-receiving window, and at least two dual pyroelectric elements arranged in the package, each of the dual pyroelectric elements having first and second unit pyroelectric elements, the first and second unit pyroelectric elements being connected in series or parallel with each other so as to have opposite polarities, wherein the first and second light-receiving electrodes and the first and second back electrodes are formed such that an effective light-receiving electrode area of the first unit pyroelectric element opposing a central portion of the light-receiving window is smaller than an effective light-receiving electrode area of the second unit pyroelectric element opposing a peripheral portion of the light-receiving window. A difference between secondary infrared rays incident on the first and second unit pyroelectric elements which is caused by a difference between angles of visibility of these elements with respect to the light-receiving window can be compensated. This invention also relates to a method of manufacturing the dual pyroelectric element.

REFERENCES:
patent: 3839640 (1974-10-01), Rossin
patent: 4800278 (1989-01-01), Taniguti et al.
patent: 4803360 (1989-02-01), Ball et al.

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