EP0232184A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Infrared detector
Assignee: Fujitsu Ltd
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Filing: 1987-02-06
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Granted: —
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Expires: 2007-02-06
Abstract
Abstract An infrared detector comprises a cold shield (20) consisting of: a light shielding portion (16) consisting of a substrate (10) made of an infrared transmitting material, an infrared absorbing layer (11) formed on one surface of the substrate (10), a dielectric layer (12), formed on the infrared absorbing layer (11), and an infrared reflecting layer (13) formed on the dielectric layer (12), and opening portions consisting of the substrate (10) and the dielectric layer (12), the infrared array (21) having detecting areas (22) arranged just below the opening portions of the cold shield (20).
Inventors
- 👤 Tohru Maekawa
- 👤 Satoshi Ueda
- 👤 Hiroshi Takigawa
- 👤 Tetsuya Kochi
- 👤 Junjiro Goto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 12:31
CPC Classifications
H; H10; H10F; H10F77/00; H10F77/30; H10F77/306; H10F77/331; H10F77/334; H10F77/40; H10F77/413
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
51 words
An infrared detector, comprising an infrared detector array and a cold shield having infrared transmitting portions each of a size and shape corresponding to a detector element of the array, the cold shield being placed over the array with the infrared transmitting portions arranged facing respective detector elements of the array.
Claim 2
Dependent Claim
51 words
An infrared detector, comprising an infrared detector array and a cold shield having infrared transmitting portions each of a size and shape corresponding to a detector element of the array, the cold shield being placed over the array with the infrared transmitting portions arranged facing respective detector elements of the array.
Claim 3
Dependent Claim
39 words
An infrared detector as claimed in claim 1, wherein the infrared transmitting portions are occupied by an infrared transmitting solid material, and the portions of the cold shield other than the infrared transmitting portions comprise an infrared absorbing material.
Claim 4
Dependent Claim
101 words
An infrared detector comprising: a cold shield having first and second portions, said first portion being a light shielding portion comprising a substrate made of an infrared transmitting material, an infrared absorbing layer formed on one side surface of the substrate, a dielectric layer formed on the infrared absorbing layer, and an infrared reflecting layer formed on the dielectric layer; and said second portion being an opening portion comprising said substrate and a dielectric layer formed on said side surface of the substrate; and an infrared detector array having a detecting area arranged facing said opening portion of said cold shield.
Claim 5
Dependent Claim
101 words
An infrared detector comprising: a cold shield having first and second portions, said first portion being a light shielding portion comprising a substrate made of an infrared transmitting material, an infrared absorbing layer formed on one side surface of the substrate, a dielectric layer formed on the infrared absorbing layer, and an infrared reflecting layer formed on the dielectric layer; and said second portion being an opening portion comprising said substrate and a dielectric layer formed on said side surface of the substrate; and an infrared detector array having a detecting area arranged facing said opening portion of said cold shield.
Claim 6
Dependent Claim
39 words
An infrared-detector according to claim 3, wherein a further dielectric layer is formed on the opposite side surface of said substrate to that on which the infrared absorbing layer, the dielectric layers and the infrared reflecting layers are formed.
Claim 7
Dependent Claim
52 words
An infrared detector according to claim 3 or 4, wherein the following expressions are satisfied: wherein λ is a wavelength of desired infrared radiation to be detected, n1 is-a refractive index of said substrate, n3 is a refractive index of said dielectric layers and d1 is a thickness of said dielectric layers.
Claim 8
Dependent Claim
38 words
An infrared detector according to claim 3, 4 or 5, wherein the refractive index for infrared radiation of the dielectric layers is smaller than the refractive index of the substrate, and at the same time larger than 1.
Claim 9
Dependent Claim
23 words
An infrared detector according to any one of claims 3 to 6, wherein the infrared absorbing layer is made of Cr or Ni.
Claim 10
Dependent Claim
25 words
An infrared detector according to any one of claims 3 to 7, wherein the dielectric layers are made of CeF 3 or PbF 2 .
Claim 11
Dependent Claim
36 words
An infrared detector according to any one of claims 3 to 8, wherein infrared rays reflected at the infrared absorbing layer and infrared reflected at the infrared reflecting layer are mutually cancelled by an optical-interference effect.
Claim 12
Dependent Claim
32 words
An infrared detector according to any one of claims 3 to 9, wherein said dielectric layer of said light shielding portion is the same as said dielectric layer, of said opening portion.
References Cited (Backward Citations)
No citation records indexed.
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