US4308551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color television camera with test pattern
Assignee: Canon Inc
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Filing: 1980-03-18
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Granted: 1981-12-29
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Expires: 2000-03-18
Abstract
Abstract This specification discloses a color television camera having a test pattern projecting device. This test pattern projecting device projects a test pattern image of a desired color temperature onto an image pickup device. The color temperature of the test pattern image is adjustable.
Inventors
- 👤 Takashi Ohnuma
- 👤 Shiomi Kanie
- 👤 Toshio Araki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:14
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/10; H04N23/13
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
130 words
A television camera having a test pattern projector, comprising: an objective lens; a color resolving optical system disposed on the optic axis of said objective lens; an image pickup device for photographing a monochromatic image formed by said objective lens and said color resolving optical system; a test pattern chart projecting device including a test pattern chart for forming a monochromatic test pattern image on said image pickup device; and a variable color temperature illuminating device for illuminating said test pattern chart, said illuminating device comprising at least two light sources having different wavelength widths, a plurality of circuits having different set values for setting the quantity of light of said light sources, and a switching circuit for selectively applying the signal from said setting circuit to said light sources.
Claim 2
Dependent Claim
130 words
A television camera having a test pattern projector, comprising: an objective lens; a color resolving optical system disposed on the optic axis of said objective lens; an image pickup device for photographing a monochromatic image formed by said objective lens and said color resolving optical system; a test pattern chart projecting device including a test pattern chart for forming a monochromatic test pattern image on said image pickup device; and a variable color temperature illuminating device for illuminating said test pattern chart, said illuminating device comprising at least two light sources having different wavelength widths, a plurality of circuits having different set values for setting the quantity of light of said light sources, and a switching circuit for selectively applying the signal from said setting circuit to said light sources.
Claim 3
Dependent Claim
32 words
The television camera according to claim 1, wherein a power amplifying circuit is provided between said setting circuit for setting the quantity of light of said light sources and said light sources.
References Cited (Backward Citations)
US3552288A
Cited
DE2813262A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |