JPS5818259Y2 - flyback transformer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a flyback transformer.

In conventional flyback transformers commonly used in television receivers, high-voltage coils and low-voltage coils wound around a coil bobbin are housed together with high-voltage rectifier diodes, etc. in a resin transformer case, and the case is filled with a material such as epoxy resin. It is filled with insulating resin.

On the other hand, a variable resistor for adjusting the focus voltage is attached to an angle near the flyback transformer, and is connected to the terminal of the flyback transformer and the focus electrode of the cathode ray tube by a lead wire.

For this reason, in conventional television receivers, the flyback transformer and focus adjustment variable resistor must be individually mounted at angles and connected to each other with lead wires, and high-voltage discharges are likely to occur.

The present invention was devised in view of these points, and provides a flyback transformer that also houses a focus voltage adjustment variable resistor within the transformer case to improve safety and significantly reduce costs. be.

The present invention will be described below according to embodiments shown in the drawings.

1 and 2 show a side view and a sectional view of an embodiment of the present invention, where 1 and 1' are U-shaped magnetic cores, and 2 is a relative representation of the cores 1 and 1'. 3 is a low-voltage coil bobbin, 4 is a low-voltage coil wound around the bobbin 3, 5 is a high-voltage coil bobbin, 6 is a high-voltage coil wound around the bobbin 5, and 7 is a transformer case. Yes, the low voltage coil bobbin 3 and the high voltage coil bobbin 5 are inserted into the core part 8 in the transformer case 7 in an overlapping state, and the above pair of coil bobbins are inserted into the core insertion hole 9 of the case 7 on the outside of the male face transformer case 7. Cores 1 and 1' are inserted through the cores 1 and 1', and the cores 1 and 1' are fastened together by a core band 2.

In this way, similarly to the conventional flyback transformer, the coil bobbins 3 and 5 on which the coils 4 and 6 are wound, respectively, are installed in the transformer case 7, and are connected to high-voltage rectifier diodes (not shown here) and high-voltage resistors (not shown here). (not shown), and the case 7 is filled with an insulating resin 10;
A variable resistor housing part 11 is integrally formed in the housing part 11, and a focus voltage adjusting variable resistor 12 and a printed wiring board (alumina substrate) 13 are stored in the housing part 11.

To explain the actual method of assembling the flyback transformer of the above embodiment, first, insert the shaft of the focus voltage adjustment variable resistor 12 into the shaft insertion hole 14 of the variable resistor housing 11 of the transformer case 7, On the other hand, externally, the low voltage coil bobbin 3 and the voltage coil bobbin 5 are superimposed in advance, and the lead wires of the coils 4 and 6 wound around both bobbins 3.5 are appropriately connected to the lead wires of the high voltage rectifier diode and the high voltage resistor. The lead wire is also connected to the metal terminal 15 of the printed wiring board 13, and in this state, the focus voltage extraction terminal 16, which has been implanted in advance on the printed wiring board 13, is inserted into the terminal insertion hole of the variable resistor storage section 11. 17
At the same time, the low voltage coil bobbin 3 is inserted into the core of the transformer case 7.

After that, the transformer case 7 is filled with an insulating resin 10 such as epoxy resin.

When a flyback transformer is formed as described above, since the contact 18 on the back surface of the variable resistor 12 has elasticity,
The contactor 18 is brought into contact with a foil-conducting portion printed in advance on the printed wiring board 13, and is electrically connected to the metal terminal 15 and the focus voltage extraction terminal 16 via the foil-conducting portion.

According to the flyback transformer of the present invention, not only the high and low voltage coils, high voltage rectifier diodes, etc. are housed in the transformer case as described above, but also the focus voltage is stored in the variable resistor housing part integrally formed in the case. Since the variable resistor for adjustment is also housed and the case is filled with insulating resin, the mounting angle of the variable resistor for adjusting the focus voltage, which was required in the past, is no longer required, and workability is improved compared to the conventional case. As a result, costs can be significantly reduced, and it is also advantageous for downsizing television receivers, and the risk of high voltage discharge is reduced.

In addition, according to the flyback transformer of the present invention, the variable resistor for adjusting the focus voltage is stored in the variable resistor storage section of the transformer case with the contact on the back side of the variable resistor in contact with the conductive foil part on the printed wiring board. Therefore, the variable resistor can be electrically connected to each coil and focus heavy pressure output terminal via the printed wiring board without directly connecting the lead wire, making it easy to assemble the flyback transformer. The focus adjustment variable resistor can be easily housed in the transformer case.

Furthermore, in the present invention, since the focus voltage extraction terminal is protruded from the variable resistor storage portion of the transformer case, the focus voltage can be easily extracted from the terminal, and the electrical connection to the focus electrode of the cathode ray tube is also simplified.

[Brief explanation of drawings]

FIG. 1 is a side view of one embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA' in FIG. 3...Low voltage coil bobbin, 4...Low voltage coil, 5...High voltage coil bobbin, 6...
...High voltage coil, 7...Transformer case, 10
...Insulating resin, 11... Variable resistor housing, 12... Variable resistor for focus adjustment, 13... Printed wiring board, 16.・・・・・・
・Focus voltage output terminal.

Claims (1)

[Scope of utility model registration request] A variable resistor storage section is integrally formed in the transformer case, and the variable resistor for adjusting the focus voltage is stored in the storage section with the contact on the back side of the variable resistor in contact with the conductive foil section on the printed wiring board. A flyback transformer in which a focus voltage extraction terminal implanted on the printed wiring board projects from the housing part, and the transformer case is filled with an insulating resin.