US4670779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color-picture analyzing apparatus with red-purpose and green-purpose filters
Assignee: Sharp Corp
•
Filing: 1985-01-04
•
Granted: 1987-06-02
•
Expires: 2005-01-04
Abstract
Abstract A color-picture reading apparatus comprises blue, red-purpose, and green-purpose fluorescent lamps, a red filter in front of the red-purpose lamp for solely passing the red radiation, a green filter in front of the green-purpose lamp for solely passing the green radiation, and a circuit for subsequently switching on and off the three lamps. Both the red filter and the green filter comprise a first filter for filtering the short wavelength radiation and a second filter for cutting the long wavelength radiation. The first filter is a glass filter and the second filter is an interference filter. All of the three lamps have a short afterglow time.
Inventors
- 👤 Fumikazu Nagano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:12
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/48; H04N1/482; H04N1/484; G; G01; G01J; G01J3/00; G01J3/46; G01J3/50; G01J3/51; G01J3/501
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
160 words
A color picture analyzing apparatus comprising: first lamp means for propagating blue spectral radiation toward said color picture; second lamp means for directing spectral radiation inclusive of red radiation toward said color picture; third lamp means for directing spectral radiation inclusive of green radiation toward said color picture; red filter means for solely passing the red radiation, said red filter means being positioned between the second lamp means and the color picture, said red filter means comprising a first glass filter for cutting the short wavelength radiation and a first interference filter for cutting the long wavelength radiation; green filter means for solely passing the green radiation, said green filter means being positioned between the third lamp means and the color picture, said green filter means comprising a second glass filter for cutting the short wavelength radiation and a second interference filter for cutting the long wavelength radiation; and means for subsequently switching on and off said three lamp means.
Claim 2
Dependent Claim
160 words
A color picture analyzing apparatus comprising: first lamp means for propagating blue spectral radiation toward said color picture; second lamp means for directing spectral radiation inclusive of red radiation toward said color picture; third lamp means for directing spectral radiation inclusive of green radiation toward said color picture; red filter means for solely passing the red radiation, said red filter means being positioned between the second lamp means and the color picture, said red filter means comprising a first glass filter for cutting the short wavelength radiation and a first interference filter for cutting the long wavelength radiation; green filter means for solely passing the green radiation, said green filter means being positioned between the third lamp means and the color picture, said green filter means comprising a second glass filter for cutting the short wavelength radiation and a second interference filter for cutting the long wavelength radiation; and means for subsequently switching on and off said three lamp means.
Claim 3
Dependent Claim
20 words
The apparatus of claim 1, wherein each of said first, second and third lamp means has a short afterglow time.
Claim 4
Dependent Claim
18 words
The apparatus of claim 2, wherein one of said second and third lamp means is a fluorescent lamp.
Claim 5
Dependent Claim
14 words
The apparatus of claim 3, wherein the fluorescent lamp is a cool white type.
Claim 6
Dependent Claim
52 words
The apparatus of claim 1, wherein said red filter means and said green filter means prevent the spectral transmission zones of the radiation from both said second lamp means and said third lamp means from being shifted even when the radiation is obliquely incident upon said red and green filter means respectively.
References Cited (Backward Citations)
JPS5530214A
Cited
JPS5597772A
Cited
JPS55131873A
Cited
JPS5717263A
Cited
US4371258A
Cited
US4318122A
Cited
JPS57150270A
Cited
US4469433A
Cited
GB2138244A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-01 | 1990-12-01 | 1991-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-01 | 1994-12-01 | 1995-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-01 | 1998-12-01 | 1999-06-02 | $7700.00 | Window Closed / Lapsed |