US3833756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color television signal generator
Assignee: Ikegami Tsushinki Co Ltd
•
Filing: 1972-08-09
•
Granted: 1974-09-03
•
Expires: 1992-08-09
Abstract
Abstract Disclosed is a color television signal generator which is capable of producing color television signals directly from an 8 mm-width color film to reproduce the colored images of the film on a home-use color television. The present generator uses a polygonal prism which is rotated in synchronous relation with the feeding of the film, thus assuring that the raster on the flyingspot scanner is in register with the frame of the film, no matter what the feeding speed of the film is. Also, the present generator includes a color reproduction compensator which functions to subtract green and blue contents from the red component color, thus reproducing the color image of the film on the home-use color television with high fidelity of color.
Inventors
- 👤 M Kumagai
- 👤 T Sasaoka
- 👤 Y Nakayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:07
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/11
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
277 words
Apparatus for generating color television signals from a color film comprising: a. a flying spot scanner for producing a raster, said flying spot scanner including a cathode ray tube having a phosphor screen, said phosphor screen emitting light having peak values in the green and blue spectral regions in response to excitation by an electron beam, b. a movable polygonal prism positioned to receive light from said raster and reflect said light on to said film, c. means for driving said film and said movable polygonal prisms in synchronous relation to obtain registration of the raster of said flying spot scanner on a frame of said film regardless of the film driving speed, d. spectroscopic means for dividing the light passing through said film into first, second and third color components which are primarily red, green and blue respectively, said first component having significant green and blue portions in addition to red, and e. means for coverting said color components into electrical signals, said means comprising first, second and third photomultipliers for receiving said first, second and third color components, and first and second phase inverters coupling the outputs of said second and third photomultipliers with reversed phase to the output of said first photomultiplier, the inverted outputs of said second and third photomultipliers reducing the portions of green and blue in the output of said first photomultiplier thereby improving color purity and reproduction of white in the balanced condition, the energy in the green and blue spectral regions of the light emitted by said phosphor screen providing signals for compensating for green and blue portions in the red signal at the output of said first photomultiplier.
Claim 2
Dependent Claim
277 words
Apparatus for generating color television signals from a color film comprising: a. a flying spot scanner for producing a raster, said flying spot scanner including a cathode ray tube having a phosphor screen, said phosphor screen emitting light having peak values in the green and blue spectral regions in response to excitation by an electron beam, b. a movable polygonal prism positioned to receive light from said raster and reflect said light on to said film, c. means for driving said film and said movable polygonal prisms in synchronous relation to obtain registration of the raster of said flying spot scanner on a frame of said film regardless of the film driving speed, d. spectroscopic means for dividing the light passing through said film into first, second and third color components which are primarily red, green and blue respectively, said first component having significant green and blue portions in addition to red, and e. means for coverting said color components into electrical signals, said means comprising first, second and third photomultipliers for receiving said first, second and third color components, and first and second phase inverters coupling the outputs of said second and third photomultipliers with reversed phase to the output of said first photomultiplier, the inverted outputs of said second and third photomultipliers reducing the portions of green and blue in the output of said first photomultiplier thereby improving color purity and reproduction of white in the balanced condition, the energy in the green and blue spectral regions of the light emitted by said phosphor screen providing signals for compensating for green and blue portions in the red signal at the output of said first photomultiplier.
Claim 3
Dependent Claim
106 words
The apparatus defined by claim 1 wherein said flying spot scanner includes a cathode ray tube having a grid electrode, said apparatus further comprising a photosensitive element positioned to receive light from a raster generated by said cathode ray tube, and an impedance element coupled between the output of said photosensitive element and a voltage source, the output of said photosensitive element being further coupled to the grid electrode of said cathode ray tube, the voltage on said grid electrode being controlled by the output of said photosensitive element to maintain constant electron beam intensity in said cathode ray tube despite variations in said voltage source.
Claim 4
Dependent Claim
14 words
The apparatus defined by claim 2 wherein said photosensitive element is a photovoltaic element.
Claim 5
Dependent Claim
14 words
The apparatus defined by claim 2 wherein said photosensitive element is a photoconductive element.
Claim 6
Dependent Claim
13 words
The apparatus defined by claim 2 wherein said impedance element is a resistor.
Claim 7
Dependent Claim
169 words
The apparatus defined by claim 1 which further comprises actuating and release means coupled to said film driving means for engaging and releasing respectively said film from said film driving means; a transfer switch operated by said actuating means, contacts on said transfer switch being closed when said film driving means is engaged with said film; a POWER switch having first and second switch positions; PLAY and STOP switches connected in series with said actuating and release means respectively between the first position of said POWER switch and a first terminal of a power source; and means coupling said transfer switch between the second position of said POWER switch and said release means, said actuating and release means being activated through said PLAY and STOP switches respectively when the first position of said POWER switch is coupled to the second terminal of the power source, and said release means being activated through said transfer switch when the second position of said POWER switch is coupled to said power source.
Claim 8
Dependent Claim
33 words
The apparatus defined by claim 6 wherein said actuating and release means are electrically operated solenoids and said transfer means is a microswitch having contacts which close when said actuating solenoid is energized.
Claim 9
Dependent Claim
248 words
The apparatus defined by claim 1 which further comprises actuating and release means for engaging and releasing respectively said film from said film driving means; a transfer switch operated by said actuating means having a first contact coupled to said actuating means and a second contact coupled to said release means, the first contact of said transfer switch being connected to a first terminal of a power source when said film driving means is released from engagement with said film and the second contact of said transfer switch being connected to the first terminal of said power source when said film driving means is engaged with said film; a POWER switch having first and second positions; PLAY and STOP switches connected in series with said actuating and release means respectively to the first position of said POWER switch; and means coupling the second position of said POWER switch to said release means, said actuating means being activated through said PLAY switch and the first contact of said transfer switch when the first position of said POWER switch is coupled to a second terminal of said power source, and said release means being activated either through said STOP switch and the second contact of said transfer switch when the first position of said POWER switch is coupled to the second terminal of said power source or directly through said POWER switch when the second position of said POWER switch is coupled to the second terminal of said power source.
Claim 10
Dependent Claim
63 words
The apparatus defined by claim 8 wherein said actuating and release means are electrically operated solenoids and said transfer switch is a microswitch having first, second and common contacts, saId common contact being transferred from said first contact to said second contact when said actuating solenoid is energized and from said second contact to said first contact when said release solenoid is actuated.
Claim 11
Dependent Claim
51 words
The apparatus defined by claim 1 wherein said spectroscopic means comprises a prism having three surfaces for dividing light from said film into three separate beams transmitted in radial directions 120* apart from each other and first, second and third filters, each of said filters receiving one of said separate beams.
Claim 12
Dependent Claim
20 words
The apparatus defined by claim 10 wherein said first, second and third filters transmit red, green and blue light respectively.
Claim 13
Dependent Claim
68 words
The apparatus defined by claim 1 wherein said cathode ray tube has a focusing coil surrounding the neck of said tube and a plurality of corrugated resilient strips positioned in the annular space between said focusing coil and the neck of said tube, said corrugated strips being positioned to provide precise alignment of said focusing coil with respect to the central axis of the neck of said tube.
Claim 14
Dependent Claim
40 words
The apparatus defined by claim 12 wherein three corrugated resilient strips are positioned symmetrically around the neck of said tube, said strips being displaced 120* apart with their longitudinal axes parallel to the axis of the neck of said tube.
Claim 15
Dependent Claim
85 words
The apparatus defined by claim 1 wherein said means for driving said film and polygonal prism comprises a torque motor having a variable resistor connected to one winding thereof and a shorting switch coupled across said resistor, said motor operating at a first speed when said switch is closed and a lower speed when said switch is open, said variable resistor permitting adjusting of the phase of the voltage applied to the winding of said motor when said switch is open thereby controlling its speed.
Claim 16
Dependent Claim
57 words
The apparatus defined by claim 1 wherein first and second variable resistors are interposed between the output of said first and second phase inverters and the output of said first photomultiplier, said variable resistors permitting adjustment of the portions of the inverted outputs of said second and third photomultiplier coupled to the output of said first photomultiplier.
Claim 17
Dependent Claim
15 words
The apparatus defined by claim 1 wherein said phosphor screen comprises a mixture of phosphors.
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |