US4706115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Geometry adjustment circuit for a color video projector producing vertical amplitude, vertical linearity and horizontal trapezoid correction signals from a single user-controlled signal
Assignee: Societe dElectronique de la Region Pays de Loire
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Filing: 1986-03-17
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Granted: 1987-11-10
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Expires: 2006-03-17
Abstract
Abstract A geometry adjustment device for a color video projector having three monochrome tubes each projecting an image of a given color on a screen, comprising a geometry correction circuit adjustable by the user for providing, by acting on a single signal, vertical amplitude, vertical linearity and horizontal trapezoid corrections of the images projected on the screen by the tubes.
Inventors
- 👤 Joseph Colineau
- 👤 Hossein Ahmari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:25
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/22; H04N9/00; H04N9/12; H04N9/16; H04N9/28; H04N9/31
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
66 words
A geometry adjustment device for a color video projector comprising three monochrome tubes each projecting an image of a given color on a screen, said geometry adjustment device comprising: a user-controlled device, geometry adjustment circuit means responsive to said user-controlled device for modifying a single signal to produce vertical amplitude, vertical linearity and horizontal trapezoid corrections of said images projected on said screen by said tubes.
Claim 2
Dependent Claim
66 words
A geometry adjustment device for a color video projector comprising three monochrome tubes each projecting an image of a given color on a screen, said geometry adjustment device comprising: a user-controlled device, geometry adjustment circuit means responsive to said user-controlled device for modifying a single signal to produce vertical amplitude, vertical linearity and horizontal trapezoid corrections of said images projected on said screen by said tubes.
Claim 3
Dependent Claim
50 words
A device as recited in claim 1 wherein said tubes include auxiliary correction coils, and wherein said geometry adjustment circuit means includes first means for producing vertical amplitude and vertical linearity correction signals, and means for applying said vertical amplitude and vertical linearity correction signals to said auxiliary correction coils.
Claim 4
Dependent Claim
57 words
A device as recited in claim 2 wherein said first means includes: first integrator means for integrating the value of said single signal with a frame frequency signal for use in generating said vertical amplitude correction signal, and second integrator means responsive to an output of said first integrator means for producing said vertical linearity correction signal.
Claim 5
Independent Claim
52 words
A device as recited in any of claims 1, 2 or 3 in which said user-controlled device is coupled to said geometry adjustment circuit means by an infrared communication link and wherein said user-controlled device includes television operation keys and a geometry correction key for modifying the value of said single signal.
Claim 6
Dependent Claim
53 words
A device as recited in claim 3 wherein said first and second integrator means each include an integrator and wherein said user-controlled device includes a video standard switch for selecting one of at least two different video standards, a reference voltage of said integrators being adjusted in accordance with the video standard selected.
Claim 7
Dependent Claim
36 words
A device as recited in claim 2 wherein said geometry adjustment circuit means further includes convergence correction circuit means for applying convergence correction signals to said auxiliary correction coils of at least two of said tubes.
Claim 8
Dependent Claim
23 words
A device as recited in claim 2 wherein said geometry adjustment circuit means produces said correction signals in response to said single signal.
Claim 9
Dependent Claim
36 words
A device as recited in claim 1 wherein said geometry adjustment circuit means includes first means for producing a horizontal trapezoid correction signal and means for applying said horizontal trapezoid correction signal to an east-west modulator.
Claim 10
Dependent Claim
21 words
A device as recited in claim 8 wherein said first means includes integrator means for generating said horizontal trapezoid correction signal.
Claim 11
Dependent Claim
78 words
A device as recited in claim 1 wherein said color video projector further comprises an east-west modulator, wherein said tubes include at least vertical auxiliary correction coils, and wherein said geometry adjustment circuit means includes: first means for producing vertical amplitude, vertical linearity and horizontal trapezoid correction signals, means for applying said vertical amplitude and vertical linearity correction signals to said vertical auxiliary correction coils, and means for applying said horizontal trapezoid correction signal to said east-west modulator.
Claim 12
Dependent Claim
60 words
A device as recited in claim 10 wherein said first means includes: first integrator means for integrating the value of said single signal with a frame frequency signal for use in generating said vertical amplitude and horizontal trapezoid correction signals, and second integrator means responsive to an output of said first integrator means for producing said vertical linearity correction signal.
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) | 1990-11-09 | 1991-05-11 | 1991-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-09 | 1995-05-11 | 1995-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-09 | 1999-05-11 | 1999-11-10 | $7700.00 | Window Closed / Lapsed |