Infrared radiation detecting apparatus and method of manufacturing it
AssigneeMurata Manufacturing Co., Ltd.
InventorsHideo Adachi, Kiichi Minai
Life of this patent
Estimating the term…
Abstract
An infrared radiation sensing device such as a pyroelectric effect device is mounted on one surface of an insulating substrate of alumina ceramic or the like. External connection leads are provided on the insulating substrate. A hollow cylindrical member is mounted on its end on the radiation receiving surface of the infrared radiation sensing device. A field effect transistor is provided on the other surface of the insulating substrate for amplifying the signal generated in the sensing device by incident infrared radiation. The apparatus is suitably encapsulated in a layer of resin.
Claims42
An infrared radiation detecting apparatus, comprising:
- a substrate made of an insulating material;
- a thermal type infrared radiation sensing device having first and second opposing main surfaces, said first main surface constituting a radiation receiving surface for providing, responsive to heat caused by incident infrared radiation impinging upon said radiation receiving surface, an electrical signal representative of the intensity of said incident infrared radiation;
- said second main surface of said thermal type infrared radiation sensing device being secured to said insulating substrate;
- an annular member secured to the combination of said insulating substrate and said thermal type infrared radiation sensing device so as to surround said radiation receiving surface for blocking infrared radiation approaching said radiation receiving surface at more than a predetermined angle from the normal;
- external connection lead means secured to said insulating substrate and in electrical contact with said thermal type infrared radiation sensing device;
- a first resin layer covering said thermal type infrared radiation sensing device except said radiation receiving surface, and covering said insulating substrate and a portion of said external connection lead means;
- and
- a second resin layer covering said radiation receiving surface, said second resin layer being transparent to infrared radiation having a wave length within a predetermined range.
An infrared radiation detecting apparatus, comprising:
- pyroelectric effect device means comprising a ceramic plate having first and second opposing main surfaces, first and second electrode means formed on said first and second main surfaces of said ceramic plate, respectively, and a radiation receiving layer of a heat absorbing material formed on said first electrode means for constituting a radiation receiving surface;
- an annular member disposed on said pyroelectric effect device so as to surround a portion of said pyroelectric effect device means including said radiation receiving surface for blocking infrared radiation approaching said radiation receiving surface at more than a predetermined angle from the normal;
- external connection lead means secured to said pyroelectric effect device means and electrically connected to said electrode means of said pyroelectric effect device means;
- a first resin layer covering said pyroelectric effect device means except for said portion of said pyroelectric device means surrounded by said annular member, and covering a portion of said external connection lead means;
- and
- a second resin layer covering said portion of said pyroelectric effect device means surrounded by said annular member, said second resin layer being transparent to infrared radiation having a wave length within a predetermined range.
Dependencies are inferred from the claim text.