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US4355866A
Expired / Lapsed
US
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Stripe-color filter
Assignee: Panasonic Holdings Corp
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Filing: 1980-08-20
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Granted: 1982-10-26
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Expires: 2000-08-20
Abstract
Abstract A stripe-color filter for spatial color encoding in a color TV camera, having a striped semiconductor filter-element-layer supported between a transparent substrate layer and a transparent dielectric covering layer. There are further provided a first coating layer of a transparent thin film between the substrate layer and the semiconductor filter-element-layer and a second coating layer of a transparent thin film between the semiconductor filter-element-layer and the covering layer. The refractive indexes of those layers are in the relationship: n F >n T1 >n S and n F >n T2 >n D , wherein n S represents the refractive index of the substrate layer, n T1 the first coating layer, n F the semiconductor filter-element-layer, n D the covering layer, and n T2 the second coating layer. Thus, the first and second coating layers act as anti-reflection layers, so that the spectral transmissivity at the semiconductor layer region of the stripe-color filter is improved.
Inventors
- 👤 Eiichiro Tanaka
- 👤 Kousaku Yano
- 👤 Yoshitaka Aoki
- 👤 Shinji Fujiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:24
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/201; H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; H01J29/898
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
137 words
A stripe-color filter having a striped semiconductor filter-element-layer supported between a transparent substrate layer and a transparent dielectric covering layer, further comprising: a first coating layer of a transparent thin film interposed between said transparent substrate layer and said semiconductor filter-element-layer; and a second coating layer of a transparent thin film interposed between said semiconductor filter element layer and said transparent covering layer; the refractive indexes of those layers being in the relationship: n F >n T1 >n S and n F >n T2 >n D , wherein n S represents the refractive index of substrate layer, n T1 the refractive index of said first coating layer, n F the refractive index of said semiconductor filter element, n D the refractive index of said covering layer, and n T2 the refractive index of said second coating layer.
Claim 2
Dependent Claim
137 words
A stripe-color filter having a striped semiconductor filter-element-layer supported between a transparent substrate layer and a transparent dielectric covering layer, further comprising: a first coating layer of a transparent thin film interposed between said transparent substrate layer and said semiconductor filter-element-layer; and a second coating layer of a transparent thin film interposed between said semiconductor filter element layer and said transparent covering layer; the refractive indexes of those layers being in the relationship: n F >n T1 >n S and n F >n T2 >n D , wherein n S represents the refractive index of substrate layer, n T1 the refractive index of said first coating layer, n F the refractive index of said semiconductor filter element, n D the refractive index of said covering layer, and n T2 the refractive index of said second coating layer.
Claim 3
Dependent Claim
48 words
A stripe-color filter as claimed in claim 1, wherein the total thickness of said first and second coating layers is in such a range that the spectral characteristic of the total film comprising these layers exhibits a maximum transmissivity at a wavelength of from 400 to 700 nm.
Claim 4
Dependent Claim
53 words
A stripe-color filter as claimed in claim 1, wherein the total optical thickness of said first and second coating layers is smaller than one-quarter of the wavelength at the fundamental-absorption edge of the semiconductor filter element, or is larger than 1/2×700 nm and smaller than three-quarters of the wavelength at the fundamental-absorption edge.
Claim 5
Dependent Claim
102 words
A stripe-color filter as claimed in claim 1, wherein said substrate layer and said covering layer have refractive indexes of from 1.4 to 1.8, said semiconductor filter-element-layer is composed of either Zn x Cd 1-x S, Zn x Se 1-x Te or ZnS x Te 1-x , in which 0≦x≦1, and said first and second coating layers are composed of either ZrO 2 , Y 2 O 3 , In 2 O 3 , ThO 2 , HfO 2 , CeO 2 , TiO 2 , Ta 2 O 5 , ZnO, Eu 2 O 3 or La 2 O 3 .
Claim 6
Dependent Claim
25 words
A stripe-color filter as claimed in claims 1, 2, or 3, wherein said first coating layer has a thickness of from 0.05 to 0.07 μm.
Claim 7
Dependent Claim
67 words
A stripe-color filter as claimed in claims 1, 2, or 3, wherein said first coating layer has a thickness of from 0.05 to 0.07 μm and wherein said semiconductor filter element layer is composed of Zn x Cd 1-x S in which 0≦x≦1 and said first and second coating layers are composed of either ZrO 2 , Y 2 O 3 or In 2 O 3 .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |