Patent US4445101A successfully refreshed from Google Patents.
US4445101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deflecting yoke assembly for making a trapezoidal raster
Assignee: Victor Company of Japan Ltd
•
Filing: 1982-07-19
•
Granted: 1984-04-24
•
Expires: 2002-07-19
Abstract
Abstract A saturable reactor having a pair of series coils is attached to the outside surface of the cores of the vertical deflecting coils where the series coils are connected in series with a parallel connection of the horizontal deflecting coils. Each of the pair of coils of the saturable reactor is wound around a drum core which is magnetically biased by means of a permanent magnet. The saturable reactor is positioned so that leakage flux from the vertical deflecting coils is led into the drum cores, thereby changing the inductance of the pair of coils in accordance with the degree of vertical deflection. The horizontal deflecting currents flowing through the horizontal deflecting coils thus controlled to chage the width of raster providing a trapezoidal raster which is needed for projecting a TV picture on a large screen.
Inventors
- 👤 Toshio Kobayashi
- 👤 Hideo Hishiki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 00:55
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/70; H01J29/72; H01J29/76; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/22; H04N3/23; H04N3/237; H01J2229/00; H01J2229/96; H01J2229/964
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
149 words
A deflecting yoke assembly for making a trapezoidal raster, comprising: (a) a deflecting yoke having a pair of vertical deflecting coils and a pair of horizontal deflecting coils; and (b) a pair of saturable reactors each having a core positioned so that leakage flux from said vertical deflecting coils is applied thereinto, means for magnetically biasing said core in a predetermined direction, and at least one coil wound around said core, the coils of said pair of saturable reactors being connected in series such that their winding directions are opposite to each other, the series connected coils of said saturable reactors being connected in series with said pair of horizontal deflecting coils so that the horizontal deflecting current flowing through the pair of horizontal deflecting coils is modulated by a change in inductance of said saturable reactors in response to vertical deflecting current flowing through said vertical deflecting coils.
Claim 2
Dependent Claim
149 words
A deflecting yoke assembly for making a trapezoidal raster, comprising: (a) a deflecting yoke having a pair of vertical deflecting coils and a pair of horizontal deflecting coils; and (b) a pair of saturable reactors each having a core positioned so that leakage flux from said vertical deflecting coils is applied thereinto, means for magnetically biasing said core in a predetermined direction, and at least one coil wound around said core, the coils of said pair of saturable reactors being connected in series such that their winding directions are opposite to each other, the series connected coils of said saturable reactors being connected in series with said pair of horizontal deflecting coils so that the horizontal deflecting current flowing through the pair of horizontal deflecting coils is modulated by a change in inductance of said saturable reactors in response to vertical deflecting current flowing through said vertical deflecting coils.
Claim 3
Dependent Claim
17 words
A deflecting yoke assembly as claimed in claim 1, wherein said core has an open magnetic path.
Claim 4
Dependent Claim
16 words
A deflecting yoke assembly as claimed in claim 1, wherein said core has a spool-like shape.
Claim 5
Dependent Claim
22 words
A deflecting yoke assembly as claimed in claim 1, wherein the magnetically biasing means comprises a permanent magnet attached to said core.
Claim 6
Dependent Claim
29 words
A deflecting yoke assembly as claimed in claim 4, wherein said magnet is attached to an outer end of a flange portion of said core having a spool-like shape.
Claim 7
Dependent Claim
35 words
A deflecting yoke assembly as claimed in claim 5, wherein the direction of said magnet is opposite to the direction of the leakage magnetic flux existing in said core at the beginning of vertical scanning.
Claim 8
Dependent Claim
45 words
A deflecting yoke assembly as claimed in claim 5, wherein the magnitude of said magnet is selected so that the magnetic bias given therefrom is greater than the magnitude of the leakage magnetic flux which exists in said core at the beginning of vertical deflection.
Claim 9
Dependent Claim
40 words
A deflecting yoke assembly as claimed in claim 1, wherein one end of said core of said saturable reactor is positioned in the vicinity of the connecting section between two halves of the core assembly of said vertical deflecting coils.
Claim 10
Dependent Claim
30 words
A deflecting yoke assembly as claimed in claim 8, wherein said core of said saturable reactor is radially arranged with respect to said core assembly of said vertical deflecting coils.
References Cited (Backward Citations)
US3004188A
Cited
US3854108A
Cited
US3889217A
Cited
US3906418A
Cited
US4227122A
Cited
US4331907A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |