Patent US3904928A successfully refreshed from Google Patents.
US3904928A
Expired / Lapsed
US
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Flyback transformer
Assignee: Hitachi Ltd
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Filing: 1973-10-10
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Granted: 1975-09-09
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Expires: 1993-10-10
Abstract
Abstract A flyback transformer comprising a magnetic core and primary and secondary windings wound around the magnetic core, the secondary winding of a plurality of winding units wound on a bobbin and the same plurality of rectifying elements connected alternately in series, one terminal of the secondary winding being grounded and the other terminal thereof being connected to a picture tube, whereby a high DC voltage to be applied to the picture tube is obtained with a compact structure.
Inventors
- 👤 Hiroji Sawada
- 👤 Yasuhiro Mizuhara
- 👤 Tokio Isogai
- 👤 Matao Nagai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:48
CPC Classifications
H; H10; H10W; H10W90/00; H01; H01F; H01F38/00; H01F38/42; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/06; H02M7/10; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/18; H04N3/19; H01F27/00; H01F27/40; H01F27/408
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
103 words
A flyback transformer comprising a magnetic core and primary and secondary windings wound around said magnetic core, said secondary winding including a plurality of winding units wound on a plurality of winding grooves of a bobbin and a plurality of rectifying elements of small capacity, the number of winding units in said plurality of winding units being equal to the number of rectifying elements in said plurality of rectifying elements, said winding units being connected only by said rectifying elements alternately in series, one terminal of said secondary winding being substantially grounded and the other terminal thereof being connected to a picture tube.
Claim 2
Dependent Claim
103 words
A flyback transformer comprising a magnetic core and primary and secondary windings wound around said magnetic core, said secondary winding including a plurality of winding units wound on a plurality of winding grooves of a bobbin and a plurality of rectifying elements of small capacity, the number of winding units in said plurality of winding units being equal to the number of rectifying elements in said plurality of rectifying elements, said winding units being connected only by said rectifying elements alternately in series, one terminal of said secondary winding being substantially grounded and the other terminal thereof being connected to a picture tube.
Claim 3
Dependent Claim
23 words
A flyback transformer according to claim 1, wherein each of the rectifying elements is connected in parallel with a voltage variation preventing element.
Claim 4
Dependent Claim
30 words
A flyback transformer according to claim 1, wherein the winding units are wound on every other winding groove and the rectifying elements are arranged in every other vacant winding groove.
Claim 5
Dependent Claim
19 words
A flyback transformer according to claim 1, wherein the rectifying elements are arranged around the periphery of the bobbin.
Claim 6
Dependent Claim
22 words
A flyback transformer according to claim 1, wherein the winding groove next to the winding unit of the highest potential is vacant.
Claim 7
Dependent Claim
26 words
A flyback transformer according to claim 1, wherein the magnetic core with the primary and secondary windings is immersed in an oil sealed in a vessel.
Claim 8
Dependent Claim
24 words
A flyback transformer according to claim 1, wherein at least the secondary winding is molded with a packing insulating material of a thermo-setting resin.
Claim 9
Dependent Claim
137 words
A flyback transformer comprising a magnetic core and primary and secondary windings wound coaxially around said magnetic core, said magnetic core being divided into two legs, the legs being rigidly fixed to a mount, each of said primary and secondary windings being wound on winding grooves of a bobbin, said secondary winding including a plurality of winding units wound on said winding grooves of the bobbin for said secondary winding and a plurality of rectifying elements of small capacity, the number of winding units in said plurality of winding units being equal to the number of rectifying elements in said plurality of rectifying elements, said winding units being connected only by said rectifying elements alternately in seies, one terminal of said secondary winding being substantially grounded and the other terminal thereof being connected to a picture tube.
Claim 10
Dependent Claim
137 words
A flyback transformer comprising a magnetic core and primary and secondary windings wound coaxially around said magnetic core, said magnetic core being divided into two legs, the legs being rigidly fixed to a mount, each of said primary and secondary windings being wound on winding grooves of a bobbin, said secondary winding including a plurality of winding units wound on said winding grooves of the bobbin for said secondary winding and a plurality of rectifying elements of small capacity, the number of winding units in said plurality of winding units being equal to the number of rectifying elements in said plurality of rectifying elements, said winding units being connected only by said rectifying elements alternately in seies, one terminal of said secondary winding being substantially grounded and the other terminal thereof being connected to a picture tube.
Claim 11
Dependent Claim
27 words
A flyback transformer according to claim 8, wherein the magnetic core with the primary and secondary windings is buried in a setting synthetic resin in a casing.
Claim 12
Dependent Claim
144 words
A flyback transformer including a primary winding and a secondary winding both wound around a magnetic core, said secondary winding having a first terminal and a second termiNal and comprising a series connection of alternately connected winding units and rectifying elements, the number of said winding units in said series connection being equal to the number of said rectifying elements in said series connection, said winding units being connected only by said rectifying elements, the terminal of the winding unit at one end of said series connection forming said first terminal of said secondary winding, the terminal of the rectifying element at the other end of said series connection forming said second terminal of said secondary winding, said first terminal of said secondary winding being connected to ground and said second terminal of said secondary winding adapted to be connected to a picture tube.
Claim 13
Dependent Claim
144 words
A flyback transformer including a primary winding and a secondary winding both wound around a magnetic core, said secondary winding having a first terminal and a second termiNal and comprising a series connection of alternately connected winding units and rectifying elements, the number of said winding units in said series connection being equal to the number of said rectifying elements in said series connection, said winding units being connected only by said rectifying elements, the terminal of the winding unit at one end of said series connection forming said first terminal of said secondary winding, the terminal of the rectifying element at the other end of said series connection forming said second terminal of said secondary winding, said first terminal of said secondary winding being connected to ground and said second terminal of said secondary winding adapted to be connected to a picture tube.
Claim 14
Dependent Claim
56 words
A flyback transformer as defined in claim 10, wherein said terminal of said rectifying element at said other end of said series connection is the cathode terminal of said rectifying element and each of said rectifying elements in said series connection has its anode terminal connected to a respective preceding winding unit in said series connection.
Claim 15
Dependent Claim
24 words
A flyback transformer as defined in claim 11, wherein each of said rectifying elements is connected in parallel with a voltage variation preventing element.
Claim 16
Dependent Claim
21 words
A flyback transformer as defined in claim 12, wherein said voltage variation preventing element is a resistor or a Zener diode.
Claim 17
Dependent Claim
63 words
A flyback transformer as defined in claim 11, wherein said series connection of alternately connected winding units and rectifying elements is formed in a plurality of grooves of a bobbin, each of said winding units and said rectifying elements lying in a different one of said plurality of grooves, the grooves containing winding units being alternately arranged with the grooves containing rectifying units.
Claim 18
Dependent Claim
65 words
A flyback transformer as defined in claim 11, wherein said winding units in said series connection of alternately connected winding units and rectifying elements are formed in a plurality of grooves of a bobbin, each of said winding units lying in a different one of said plurality of grooves; and said rectifying elements in said series connection are arranged around the periphery of said bobbin.
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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |