# US 5,344,518 A · Pyroelectric IR-sensor

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- Number: US 5,344,518 A
- Document ID: US5344518A
- Status: Granted
- Kind: A
- Application number: 08/021,371
- Filed: 1993-02-23
- Granted: 1994-09-06
- Earliest claimed: 1989-05-18
- Assignees: Murata Manufacturing Co., Ltd.
- Inventors: Satoru Ito; Michihiro Murata; Norio Fukui; Keizou Yamamoto; Tetsujiro Sawao; Satoshi Awata; Yasuo Tada; Satoru Kawabata
- Web page: https://patentgrep.com/patent/US5344518A

## CPC

- G01J 5/34: using capacitors, e.g. pyroelectric capacitors
- H10N 15/10: Thermoelectric devices using thermal change of the dielectric constant, e.g. working above and below the Curie point
- B29L 2031/3493: {Moulded interconnect devices, i.e. moulded articles provided with integrated circuit traces}
- G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N)
- H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES

## Abstract

A pyroelectric IR-sensor in which a pyroelectric light receiving element is mounted on a MID substrate or a ceramic substrate having a thermal conductivity less than 0.02 cal/cm.sec..degree.C. Both ends of the pyroelectric light receiving element are supported by the substrate, with the central portion of the pyroelectric light receiving element being spaced from the substrate. Chip parts are mounted on the substrate.

## Claims

### Claim 1

A method for forming a pyroelectric sensor comprising:
forming an MID substrate with a first surface and a pair of spaced apart raised mounting projections extending from said first surface by injection molding a catalytic resin portion;
injection molding a non-catalytic resin to overlap said catalytic resin portion;
forming a conductive circuit on said first surface and said projections;
affixing opposite ends of a pyroelectric light receiving element to the conductive circuit on separate ones of said pair of projections, whereby a center portion of said element between said opposite ends is supported spaced from said first surface.

### Claim 2

A method for forming a pyroelectric sensor comprising:
forming a ceramic substrate with a concave surface having opposed spaced apart element supporting surfaces;
forming an electric circuit on said concave surface and said element supporting surfaces; and
affixing opposite ends of a pyroelectric light receiving element to the electric circuit on separate ones of said pair of projections, whereby a center portion of said element between said opposite ends is supported spaced from said concave surface.