US3737570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linearity correction apparatus in a flying spot scanner system
Assignee: GTE Sylvania Inc
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Filing: 1971-09-21
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Granted: 1973-06-05
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Expires: 1991-09-21
Abstract
Abstract In a flying spot scanner system having a transport means for continuously advancing a film of film frames through a film scanning zone and a light detector responsive to a light source vertically scanning the curved face plate of a cathode ray tube, linearity apparatus for altering the vertical scanning of the light source in a manner to effect linear scanning of a film frame.
Inventors
- 👤 R Eckenbrecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:55
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/36; H04N3/38
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
231 words
In a flying spot scanner system having a cathode ray tube with a curved face plate and providing a light source for application to a film of film frames continuously advanced at a pre-selected rate through a film scanning zone by a transport means wherein a light detector is vertically scanned at a nonlinear rate with respect to vertical deflection of the light source, linearity correction apparatus comprising: a flying spot scanner tube; vertical scanning signal development means; vertical scan modification signal development means coupled to said transport means to effect develOpment of vertical scan modification signals continuously varying at a rate substantially equal to said pre-selected rate of film frame advancement through said film scanning zone; signal combining network means coupled to said vertical scanning signal development means and said vertical scan modification signal development means to effect development of a combined vertical scan and vertical scan modification signal; and linearity correction means including a voltage dependent resistor (VDR) responsive to the magnitude of said combined vertical scan and vertical scan modification signals for effecting alteration in the magnitude of said vertical scan modification signals in accordance with the positional location of said film frame in said film scanning zone and for applying said magnitude alterted vertical scan modification signals to said flying spot scanner tube to alter the positional location of said light source on said curved face plate.
Claim 2
Dependent Claim
231 words
In a flying spot scanner system having a cathode ray tube with a curved face plate and providing a light source for application to a film of film frames continuously advanced at a pre-selected rate through a film scanning zone by a transport means wherein a light detector is vertically scanned at a nonlinear rate with respect to vertical deflection of the light source, linearity correction apparatus comprising: a flying spot scanner tube; vertical scanning signal development means; vertical scan modification signal development means coupled to said transport means to effect develOpment of vertical scan modification signals continuously varying at a rate substantially equal to said pre-selected rate of film frame advancement through said film scanning zone; signal combining network means coupled to said vertical scanning signal development means and said vertical scan modification signal development means to effect development of a combined vertical scan and vertical scan modification signal; and linearity correction means including a voltage dependent resistor (VDR) responsive to the magnitude of said combined vertical scan and vertical scan modification signals for effecting alteration in the magnitude of said vertical scan modification signals in accordance with the positional location of said film frame in said film scanning zone and for applying said magnitude alterted vertical scan modification signals to said flying spot scanner tube to alter the positional location of said light source on said curved face plate.
Claim 3
Dependent Claim
73 words
The linearity correction apparatus of claim 1 wherein said linearity correction means includes an adjustable resistor having an alterable arm and a voltage dependent resistor (VDR), said resistor coupling a potential source to a potential reference level and said voltage dependent resistor (VDR) coupling said alterable arm to said signal combining network means and to siad flying spot scanner tube whereby centering of said linearity correction signal is controllable by said alterable arm.
Claim 4
Dependent Claim
96 words
The linearity correction apparatus of claim 1 wherein said linearity correction means includes a first adjustable resistor connected intermediate a potential source and a potential reference level and having an alterable arm, a series connected impedance and voltage dependent resistor (VDR) coupling said alterable arm to signal combining network means, and a second adjustable resistor shunting said impedance and having an alterable arm coupled to said cathode ray tube whereby said first adjustable resistor provides controllable centering and said second adjustable resistor provides controllable magnitude of said linearity correction signal applied to said cathode ray tube.
Claim 5
Dependent Claim
210 words
Linearity correction apparatus comprising: a flying spot scanner system having a cathode ray tube with a curved face plate and providing a light source for application to a light detector by way of film frames continuously advanced at a pre-selected rate through a film scanning zone by a transport means wherein vertical scanning of the face plate and of the light detector by the light source is non-linear with respect to one another; means for developing signals at a vertical scanning frequency; means coupled to said transport means for developing vertical scan modification signals varying in magnitude and frequency at a rate substantially equal to the rate of movement of a film frame through said film scanning zone; means coupled to said means for developing signals at a vertical scanning frequency and to said means for developing vertical scan modification signals for effecting development of a combined vertical scan and vertical scan modification signal; and linearity correction means including a voltage dependent resistor (VDR) coupling said combined vertical scan and vertical scan modification signals to said cathode ray tube, said means affecting alterations in vertical scanning of said curved face plate by said light source to effect linear scanning of said film frame and light detector by said light source.
Claim 6
Dependent Claim
210 words
Linearity correction apparatus comprising: a flying spot scanner system having a cathode ray tube with a curved face plate and providing a light source for application to a light detector by way of film frames continuously advanced at a pre-selected rate through a film scanning zone by a transport means wherein vertical scanning of the face plate and of the light detector by the light source is non-linear with respect to one another; means for developing signals at a vertical scanning frequency; means coupled to said transport means for developing vertical scan modification signals varying in magnitude and frequency at a rate substantially equal to the rate of movement of a film frame through said film scanning zone; means coupled to said means for developing signals at a vertical scanning frequency and to said means for developing vertical scan modification signals for effecting development of a combined vertical scan and vertical scan modification signal; and linearity correction means including a voltage dependent resistor (VDR) coupling said combined vertical scan and vertical scan modification signals to said cathode ray tube, said means affecting alterations in vertical scanning of said curved face plate by said light source to effect linear scanning of said film frame and light detector by said light source.
Claim 7
Dependent Claim
43 words
The linearity correction apparatus of claim 4 wherein said linearity correction means includes a series connected voltage dependent resistor (VDR) and adjustable DC potential source coupled to said combined vertical scan and vertical scan modification signal source and to said cathode ray tube.
Claim 8
Dependent Claim
52 words
The linearity correction apparatus of claim 4 wherein said linearity correction means includes a series connected impedance, (VDR) coupling an adjustable DC potential source to said vertical scan and vertical scan modification signal source and an alterable resistor shunting said impedance and having an adjustable arm coupled to said cathode ray tube.
References Cited (Backward Citations)
US2817788A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |