US3575548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color video signal generating apparatus
Assignee: Sony Corp
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Filing: 1969-04-07
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Granted: 1971-04-20
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Expires: 1989-04-07
Abstract
Abstract In a color video signal generating apparatus in which an image of the object to be televised is projected through a color filter onto the photoelectric conversion layer of an image pickup tube and is divided into color component stripes which are successively scanned so that the respective light intensities of the stripes appear as corresponding successive color component signals in the electrical output of the tube, there are also formed on the photoelectric conversion layer two sets of bright and dark stripes having respective spatial frequencies that are different from each other and also each different from the spatial frequency of the color component stripes on such layer so as to provide respective index signals in the tube output, a beat signal is derived from the tube output with a frequency that is the difference between the frequencies of the respective index signals, and such beat signal, which may be frequency multiplied to correspond to the frequency of the color component signals, is employed as a reference for separating the color component signals from each other in the tube output.
Inventors
- 👤 Hiromichi Kurokawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:27
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/01
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
250 words
A color video signal generating apparatus comprising image pickup means having scanning means and being operative to photoelectrically convert light projected on the image pickup means into an electrical output composed of successive signals corresponding to the intensities of light successively encountered by said scanning means in a line scanning direction, filter means interposed optically between an object to be televised and said image pickup means and having several regions respectively selecting light of different wavelength ranges, means cooperating with said filter means for dividing an image of the object to be televised into respective color component stripes projected onto said image pickup means with a predetermined spatial frequency and which appear as successive color component signals in said output, means for forming on the image pickup means two sets of bright and dark stripes having respective spatial frequencies that are different from each other and each different from said spatial frequency of said color component stripes, said sets of bright and dark stripes appearing as respective index signals in said output, means for deriving from said output a beat signal with a frequency that is the difference between the respective frequencies of said index signals, means deriving from said beat signal a reference signal at the frequency of said color component signals, means for phase-shifting said reference signal to provide phase-shifted reference signals corresponding in phase to said color component signals, and means synchronized by said phase-shifted reference signals to separately extract said color component signals from said output.
Claim 2
Dependent Claim
250 words
A color video signal generating apparatus comprising image pickup means having scanning means and being operative to photoelectrically convert light projected on the image pickup means into an electrical output composed of successive signals corresponding to the intensities of light successively encountered by said scanning means in a line scanning direction, filter means interposed optically between an object to be televised and said image pickup means and having several regions respectively selecting light of different wavelength ranges, means cooperating with said filter means for dividing an image of the object to be televised into respective color component stripes projected onto said image pickup means with a predetermined spatial frequency and which appear as successive color component signals in said output, means for forming on the image pickup means two sets of bright and dark stripes having respective spatial frequencies that are different from each other and each different from said spatial frequency of said color component stripes, said sets of bright and dark stripes appearing as respective index signals in said output, means for deriving from said output a beat signal with a frequency that is the difference between the respective frequencies of said index signals, means deriving from said beat signal a reference signal at the frequency of said color component signals, means for phase-shifting said reference signal to provide phase-shifted reference signals corresponding in phase to said color component signals, and means synchronized by said phase-shifted reference signals to separately extract said color component signals from said output.
Claim 3
Dependent Claim
37 words
A color video signal generating apparatus according to claim 1, in which said spatial frequencies of the two sets of bright and dark stripes are both substantially greater than said spatial frequency of the color component stripes.
Claim 4
Dependent Claim
68 words
A color video signal generating apparatus according to claim 2, in which the difference between said spatial frequencies of said two sets of bright and dark stripes is a fraction of said spatial frequency of the color component stripes, and said means deriving said reference signal includes frequency multiplying means operative to multiply the frequency of said beat signal up to the frequency of said color component signals.
Claim 5
Dependent Claim
99 words
A color video signal generating apparatus according to claim 1, in which said means for forming said sets of bright and dark stripes on the image pickup means includes corresponding sets of transparent and opaque regions formed on said filter means so as to be also optically interposed between said object and said image pickup means, with the spatial frequencies of said sets of transparent and opaque regions on the filter means being different from each other and also each different from the spatial frequency of said regions of the filter means which select light of different wavelength ranges.
Claim 6
Dependent Claim
76 words
A color video signal generating apparatus according to claim 1, in which said means for forming said sets of bright and dark stripes on the image pickup means includes means defining respective sets of transparent and opaque regions outside of the optical path from said object and said image pickup means, and means projecting images of said sets of transparent and opaque regions onto said image pickup means in overlapping relation to said color component stripes.
Claim 7
Dependent Claim
42 words
A color video signal generating apparatus according to claim 5, in which said sets of transparent and opaque regions are arranged in a common plane, and the spatial frequencies of said sets of transparent and opaque regions are different from each other.
Claim 8
Dependent Claim
91 words
A color video signal generating apparatus according to claim 5, in which said sets of transparent and opaque regions are arranged in individual planes and each have the same spatial frequency as said regions of the filter means which select light of different wavelength ranges, and in which said planes of the sets of transparent and opaque regions and said filter means are all arranged at different distances from said image pickup means so as to achieve the differences in the spatial frequencies of their images on said image pickup 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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |