US3676587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television camera overexposure warning system
Assignee: COMMERCIAL ELECTRONICS Inc
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Filing: 1970-08-27
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Granted: 1972-07-11
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Expires: 1990-08-27
Abstract
Abstract A television camera overexposure warning system in which those portions of the television image which exceed a desired level of illumination of the television camera tube are caused to blink at a visible rate on the screen of the television camera viewfinder or monitor. This is accomplished by providing a threshold detector which produces an electrical signal when the amplified output signal of the camera tube exceeds a level corresponding to the maximum desired level of illumination and a gate which couples an oscillator to the viewfinder finder or monitor video input in response to the electrical signal produced by the threshold detector. In a color television camera, threshold detectors may be provided for each of the camera tubes and associated video channels or a single threshold detector may be employed in association with one of the video channels, preferably the video channel produced by the green camera tube.
Inventors
- 👤 Donald D Kline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:40
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/60; H04N23/63; H04N23/633; H04N23/634
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
114 words
In a television camera having a camera tube, lens means for applying optical images to said camera tube, amplifier means for amplifying the output signals of said camera tube, and viewfinder means for viewing the output signals of said amplifier means, the improvement comprising: threshold detector means for producing an electrical signal when the output of said amplifier means exceeds a predetermined level corresponding to the maximum desired illumination of said camera tube, oscillator means for producing an oscillatory electrical signal at a visible rate, and gate means for applying said oscillatory electrical signal of said oscillator means to said viewfinder means in response to the electrical signal produced by said threshold detector means.
Claim 2
Dependent Claim
114 words
In a television camera having a camera tube, lens means for applying optical images to said camera tube, amplifier means for amplifying the output signals of said camera tube, and viewfinder means for viewing the output signals of said amplifier means, the improvement comprising: threshold detector means for producing an electrical signal when the output of said amplifier means exceeds a predetermined level corresponding to the maximum desired illumination of said camera tube, oscillator means for producing an oscillatory electrical signal at a visible rate, and gate means for applying said oscillatory electrical signal of said oscillator means to said viewfinder means in response to the electrical signal produced by said threshold detector means.
Claim 3
Dependent Claim
130 words
In a color television camera having a plurality of camera tubes, lens means optically imaging varying spectral portions of an image on each of said camera tubes, amplifier means for amplifying the output signals of each of said camera tubes, and viewfinder means for viewing the output signals of said amplifier means, the improvement comprising: threshold detector means for producing an electrical signal when the amplified output of a particular one of said camera tubes exceeds a predetermined level corresponding to the maximum desired illumination of said camera tubes, oscillator means for producing an oscillatory electrical signal at a visible rate, and gate means for applying said oscillatory electrical signal of said oscillator means to said viewfinder means in response to the electrical signal produced by said threshold detector means.
Claim 4
Dependent Claim
130 words
In a color television camera having a plurality of camera tubes, lens means optically imaging varying spectral portions of an image on each of said camera tubes, amplifier means for amplifying the output signals of each of said camera tubes, and viewfinder means for viewing the output signals of said amplifier means, the improvement comprising: threshold detector means for producing an electrical signal when the amplified output of a particular one of said camera tubes exceeds a predetermined level corresponding to the maximum desired illumination of said camera tubes, oscillator means for producing an oscillatory electrical signal at a visible rate, and gate means for applying said oscillatory electrical signal of said oscillator means to said viewfinder means in response to the electrical signal produced by said threshold detector means.
Claim 5
Dependent Claim
20 words
Apparatus according to claim 2 wherein said particular camera tube has the green spectral portion of said image imaged thereon.
Claim 6
Dependent Claim
128 words
In a color television camera having a plurality of camera tubes, lens means optically imaging varying spectral portions of an image on each of said camera tubes, amplifier means for amplifying the output signals of each of said camera tubes, and viewfinder means for viewing the output signals of said amplifier means, the improvement comprising: threshold detector means for producing an electrical signal when the amplified output of any of said camera tubes exceeds a predetermined level corresponding to the maximum desired illumination of said camera tubes, oscillator means for producing an oscillatory electrical signal at a visible rate, and gate means for applying said oscillatory electrical signal of said oscillator means to said viewfinder means in response to the electrical signal produced by said threshold detector means.
Claim 7
Dependent Claim
128 words
In a color television camera having a plurality of camera tubes, lens means optically imaging varying spectral portions of an image on each of said camera tubes, amplifier means for amplifying the output signals of each of said camera tubes, and viewfinder means for viewing the output signals of said amplifier means, the improvement comprising: threshold detector means for producing an electrical signal when the amplified output of any of said camera tubes exceeds a predetermined level corresponding to the maximum desired illumination of said camera tubes, oscillator means for producing an oscillatory electrical signal at a visible rate, and gate means for applying said oscillatory electrical signal of said oscillator means to said viewfinder means in response to the electrical signal produced by said threshold detector means.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |