JPS609426B2 - DC high voltage generator with resistor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a DC high voltage generator with a resistor, which includes a resistor block for dividing the focus voltage of a cathode ray tube, and a DC high voltage generating block for anode voltage of the cathode ray tube, etc. in one coating body. The object of the present invention is to provide a high voltage generator with a resistor that is isolated and housed and sealed with an electrically insulating resin.

Generally, many transistor-type color television receivers use a Cockcroft light DC high voltage generator using a silicon rectifier to supply DC high voltage to the cathode ray tube anode, and its high voltage output section A fixed resistor and a variable resistor are inserted and connected between the ground potential and the ground potential so that a focus potential of about 16 to 24% of the high voltage can be extracted with respect to the ground potential.

To explain this together with Figure 1, in the figure, T is a horizontal output transistor excitation transformer, Q is a horizontal output transistor, Dd is a damper diode, C is a resonance capacitor,
Lh is horizontal deflection coil, CS is S-shaped correction capacitor, N
, is the primary winding of the flyback transformer T2, N2 is its secondary winding, the part M surrounded by the broken line is a Cockcroft type DC high voltage generator, and R, , R2 are the parts for obtaining divided voltages for focusing. Fixed resistor, Rv is a variable resistor to match the optimal focus voltage of the cathode ray tube, Vf is the focus voltage, Vcc is the power supply voltage, Ro is element protection against shock current generated by discharge inside the cathode ray tube, or the screen changes from black to white. The resistor, t, inserted in order to slow down fluctuations in the high voltage output due to sudden changes in current when changing to , is a terminal connected to the anode of the cathode ray tube, and is connected to the focus electrode of the cathode ray tube. The terminals are shown respectively.

In this case, the value of the resistor R is 110 to 220 MO.
The value of the resistor R2 is about 20 to 40 MQ, and the variable resistor Rv is about 10 to 20 MQ. Resistors for obtaining the focus divided voltage have heretofore been made by combining various resistors, and recently a focus resistor module 8 shown in FIG. 2 has been developed.

In Fig. 2, 1 is a resistor block for focus voltage division, and each resistor R,, R2, Rv is phosphorized on one alumina substrate using a thick resistor with good characteristics, and the resistor surface of the resistor Rv is It is constructed by attaching a sliding device in which the carbon contact element slides due to the rotation of the shaft. This block 1 is buffer-coated with an RTV silicone rubber resin 2 or the like which has relatively good adhesion to the resistor and the alumina substrate and has excellent thermal and electrical properties, and is cured, and then stored in an exterior case 3. Next, hard epoxy resin 4, which has better moisture resistance and adhesion than other resins and has a high heat deformation temperature, is injected into the gap inside the case 3 and hardened, and furthermore, high voltage lead wires 5 for connecting to high voltage parts, Attach the focus voltage extraction terminal 6 and the ground terminal 7, respectively, and connect the focus resistor module 8.
get. However, in the focus resistor module 8, a resin with excellent adhesion and thermal and electrical properties such as RTV silicone rubber is very expensive compared to other resins for Western models, and the material cost increases accordingly. It requires a step of buffer coating and curing, then putting it into an exterior case, filling the gaps with epoxy resin, and curing it, which has disadvantages such as a large number of work steps, complicated work, and high production costs.

Additionally, since silicone rubber has extremely high adhesion with other resins, lead wires may short-circuit along the surface of the precoat, and if the buffer coat is thin, temperature changes during use may cause the alumina substrate to On the other hand, if the exterior is coated with a thick hard epoxy resin, the epoxy resin will crack due to temperature changes.Furthermore, due to circuit failure, the resistor may continue to operate with overpower and generate heat. When the resin burns, there is no part to serve as a safety valve for gas to escape, and the resin is explosively blown away, resulting in the possibility of destruction of other parts of the device by its fragments. Furthermore, when actually used in a television receiver, the high voltage generator M and the focus resistor module 8 are installed separately in a set, and then the high voltage section lead wire 5 of the focus resistor module 8 is connected to a high voltage. It must be connected to the high voltage output side of the voltage generator M, and in order to maintain sufficient dielectric strength in that part, it requires a large space and requires complicated insulation treatment, so installation and insulation treatment are difficult. It takes a long time to install, and it also requires a large space because two high-voltage parts are installed and the connections are made within the set, so it has many disadvantages, such as being unable to be used with small models that do not take up a lot of space. there were.

The present invention eliminates the above-mentioned drawbacks, and one embodiment of a DC high voltage generator with a resistor according to the present invention will be described in the order of its manufacturing process with reference to FIG. 3 and the following figures.

First, as shown in FIG. 3, on the surface of the alumina ceramic substrate 10, a thick film (glaze) resistance paste of ruthenium oxide to rhodium oxide, palladium to silver to form an electrode and a conductive layer connected to one of the electrodes. Print and bake the conductive paste of the system to create resistors R, R2 and variable resistor Rv.
A resistor 11, electrodes 12a, 12b, 12c,
A conductive layer 13 is formed to obtain a focus voltage dividing resistor substrate 14. Next, as shown in FIG.
Lead wires 15a made of tin-plated copper wires etc. from a to 12c
- 15c are attached by solders 16a to 16c, etc., and a sliding device 17 having a rotating shaft 56 and having a super-moving contact that makes sliding contact with the conductive layer 13 and the variable resistor Rv is attached to the alumina substrate 10 by a holder 18. Attach this to obtain the focus voltage dividing resistor block 19.

At this time, the holder 18 is attached to the substrate 1 in order to prevent resin for insulation treatment from entering the parts that will become the variable resistor in a later process, such as the conductive layer 13, the variable resistor Rv part, and the sliding contact part of the sliding device.
Fix the river without any gaps. Next, as shown in FIG. 5, in order to assemble the resistor block 19 into an exterior case to be described later, the cylindrical portion 20 of the holder 18 is coated with silicone rubber or EP.
A holding bushing 21 made of T rubber or the like and having a groove 22
Install.

In addition, as shown in Fig. 6, glass mold type high voltage rectifiers D, ~ D5, in which silicon rectifying elements are glass molded, silver electrodes are baked on both planes of the ceramic dielectric, lead wires are attached in both directions, and insulated with epoxy resin, etc. The lead wires 23 of the rectifiers D, -D5 are connected so that the treated high-withstand-voltage ceramic capacitors C, -C5 constitute a DC high voltage generation circuit, which is a portion 26 surrounded by broken lines in Fig. 11. The capacitors C and C5 are connected to the lead wires 24 using solder 25 or the like to obtain a Cockcroft type DC high voltage generation block 26.

Note that the lead wire 2 of diode D and capacitor C4
3 and 24, a ground terminal 28 formed in a ring shape at the tip of the capacitor C and the lead wire 24, and a high ground terminal connected to the lead wires 23 and 24 on the output side of the diode D5 and capacitor C5. Voltage output terminals 29 are provided respectively. On the other hand, an exterior case 30 shown in FIGS. 7A and 7B is prepared. The exterior case 30 is a DC high voltage generation block 2
6, a portion 32 that stores the focus voltage dividing resistor block 19, a portion 33 that stores the resistor Ro and the high voltage lead wire, and the resistor block 1.
9 to the lead wire 15a to the DC high voltage generation block 26
In addition to isolating the resistor block 19 and DC high voltage generation block 26 from the portion 34 that is passed through to connect to the output terminal 29 of the A protrusion 36 for providing a gap 35 to prevent the voltage generation block 26 from becoming high temperature, a portion 38 to which an input terminal 37 is attached, and an outer peripheral wall 40 provided with a U-shaped notch 39 for inserting a bushing.
A U-shaped protrusion 41 that forms the green part around the U-shaped notch 55 provided in the outer peripheral wall 40 and fits into the groove 22 of the bushing 21 attached to the resistor block 19, and the claw part 42 of the holder 18 are A groove 43 for engagement is provided respectively. Further, on the outer bottom surface of the exterior case 30, there are mounting parts 44 and 45 for mounting to a chassis (not shown), and protrusions 46 and 47 for preventing the case from tilting when injecting and curing insulating resin, which will be described later. and are provided respectively. Note that the above portion 33,
34 has a depth that does not interfere with the connection of the blocks 19, 26 and the resistor Ro, etc., and the protrusion 36 has a depth of, for example, 3 to 5 mm below the height of the outer peripheral wall 40 in order to determine the amount of resin to be injected. It is lowered to about the rib level. Therefore, as shown in FIG. 8, the DC high voltage generation block 26 is housed in the section 31 of the exterior case 30, and the resistor Ro is housed in the section 33. Further, by inserting the claw portion 42 of the holder 18 of the sliding device 17 of the focus voltage dividing resistor block 19 into the groove 43 and engaging the groove 22 of the pusher 21 with the protrusion 41, the resistor block is moved to the portion 32. Store it in. At this time, the rotating shaft 56 of the tank moving device 17 projects out of the case 30 from the notch 55. Next, the lead wire 15a of the resistor block 19 and one lead wire of the fixed resistor Ro are connected to the output terminal 29 of the DC high voltage generation block 26.
Also, a bushing 48 is attached to the other lead wire of the fixed resistor Ro.
A high-voltage lead wire 4 that is inserted into and coated with cross-linked polyethylene
9 and the bushing 48 to the outer case 30.
The lead wire 27 of the DC high voltage generation block 26 is further connected to the input terminal 37. As a result, a Cockcroft-type DC high voltage generator 50 with a focus resistor module before insulation treatment is obtained. Next, on top of the generator 50 obtained as described above, a ninth
As shown in the figure, electrically insulating resin 52 is injected onto the protrusion 36 from the tip of one relatively thick nozzle 51, and is simultaneously poured into the DC high voltage generation block 26 and resistor block 19 to form bubbles. Gradually fill each block from the bottom to the top, taking care not to mix it up. Allow to harden. As this electrically insulating resin 52, for example, the present applicant has
The same unsaturated polyester resin (for example, , WP-2601 manufactured by Hitachi Chemical ■, Rubber-like Resin (trade name), etc.) and a small amount of a silane coupling agent (for example, silane coupling agent KBM manufactured by Shin-Etsu Chemical ■).
-40 inferior) is added to improve adhesion. In this case, the adhesion is determined to the extent that the insulating substrate of each block, the resistor, or the glass surface of the glass mold rectifier does not peel off due to mechanical force (if force is applied, the resin will tear,
It is desirable that the adhesion be such that the resin can be attached to the surface of each element. When injecting the electrically insulating resin 52,
It is also possible to inject the resin 52 into both blocks 26 and 19 separately using two nozzles at the same time, but in this case, if the position of each nozzle and the injection point is not precisely determined, the inside of the outer case 30 will be damaged. There is a risk that the resin will not be press-fitted and may spill outside, and the nozzle spacing position must be changed each time the dimensions of the outer case 30 differ.
Not a desirable method.

On the other hand, since the resin 52 is simultaneously poured from the top of the protrusion 36 to both sides of the protrusion 36 using one nozzle 51 as in the above-mentioned embodiment, there is no problem as described above. Furthermore, according to the above embodiment, since the resin can be gradually filled from the bottom to the top of the elements constituting each block, there is no need to entrain air.
Degassing after resin injection can be completed in a short time, and resin can be injected into both blocks at the same time with one thick nozzle, so for example, DC high voltage generation block 2 with a wide injection surface
The resin can be injected in an extremely shorter time than when the resin is injected into the resistor block 19 side through the portion 34. In addition, since a flexible unsaturated polyester resin to which a silane coupling agent has been added is used as the electrical insulating resin 52, the chemical action of the silane coupling agent causes the resin to be applied to alumina substrates, resistors, and glass molded rectifiers. Because it firmly adheres to the glass surface of the glass, there is no risk of creeping discharge or corona discharge occurring due to the poor adhesion, and even if left in high humidity conditions, the alumina substrate, resistor, rectifier, and resin will remain intact. Since moisture does not adhere to the interface with the resistor, there is no change in resistance due to moisture absorption or deterioration of the thick film resistor due to electrochemical action.

Furthermore, because the resin is malleable, even if the internal elements are not buffer-coated, the resistor will not peel off due to distortion of the resin due to temperature changes, or the internal elements or the outer case will not crack. Even if the resin is continuously operated under overpower conditions due to a circuit failure, etc., resulting in heat generation, burning the resin, and generating gas, the resin will soften, so the gas will not easily blow out to the outside and cause an explosion. . By injecting a predetermined amount of electrically insulating resin 52 and curing it as described above, as shown in FIG. A Cockcroft type direct current high voltage generator 54 with a focus suppressor module is obtained in which all parts other than the minimum necessary external connection parts such as a high voltage lead wire 49 provided with an anode cap 53 are covered with resin 52. Note that the resistor block 19 is fixed to the case 3 by the engagement between the claw portion 42 and the groove 43 and the engagement between the groove 22 and the protrusion 41 of the bushing 21.
0, the rotation direction is the same as the direction of arrows A and B shown in FIG. 8 and the direction of rotation of the rotating shaft 56.
It can be accurately regulated to a predetermined position without shifting or rattling.

An example of a circuit in which the DC high voltage generator 54 is used is shown in FIG. In FIG. 11, the same parts as in FIG. 1 and FIGS. 8 to 10 are given the same reference numerals. In the above embodiment, the block 26 shown in FIG. 6 is used as the DC high voltage generation block, but the block 26 shown in FIG. 6 is not limited to this. A DC high voltage generation block such as that shown in "DC High Voltage Generator" may also be used.

Further, the manner of engagement between the claw portion 42 of the holder 18 of the resistor block 19 and the side surface of the protrusion 36 is not limited to the engagement between the claw portion 42 and the groove 43 as in the above embodiment;
It is also possible to provide only the protrusion 57 on the protrusion 36 and sandwich it between the claws 42 on both sides, or to provide only the protrusion 58 on the protrusion 36 so that the protrusion 58 is supported on both sides of each protrusion 57. It's okay.

As described above, in the DC high voltage generator with a resistor according to the present invention, a resistance circuit combining a fixed resistance part and a variable resistance part is formed on an insulating substrate, and a resistor circuit is further formed on an insulating substrate. A resistor block in which a sliding device having sliding contacts and a rotating shaft that makes dynamic contact is attached to the insulating substrate by a holder, a DC high voltage generation block consisting of a circuit element that generates DC high voltage, and the DC high voltage generation block. The block and the resistor block are housed in respective housings separated from each other by protrusions, and then an electrically insulating resin is injected into the shell, and the height of the protrusion of the shell is the same as that of the outer circumferential wall of the cliff body. The protrusion is formed with a lower diameter, and a gap is provided on the back side of the protrusion, and
A part of the outer wall of the storage section of the cliff body that houses the resistor block is configured to have a notch that engages with the peripheral edge of the holder so that the rotating shaft projects outside the cliff body. Therefore, as shown in the following, the resistor module and DC high voltage generation block are assembled in separate external cases,
Compared to injecting insulating resin into each and curing it, only one cliff body is required, and the labor and time required for injecting and curing the insulating resin are halved, resulting in a significant cost reduction.■ Television When installing it in a TV receiver set, etc., conventionally the resistor module and the DC high voltage generation block had to be installed separately in the set and connected within the set, but only one device of the present invention can be installed. The resistor block and DC high voltage generation block can be assembled into a set, making installation extremely easy and reducing the required screws, nuts, and labor by half. Since the blocks are already connected and completely insulated by being covered with electrically insulating resin, there is no need to install them in a set and then electrically connect both blocks, which is the case with conventional methods. Failures due to poor insulation due to processing errors are completely eliminated, improving reliability. Also, the large space required to maintain the insulation of the conventionally insulated parts is no longer required, making it possible to use small The effect is particularly great when applied to television receivers.■ This occurs when the resistor block is accurately positioned at a predetermined position within the cliff body and the resistor block contacts or approaches the cliff body. There is no risk of creeping discharge or dielectric breakdown, etc. ■ Even if electrical insulating resin is poured with a nozzle toward the protruding part of the body, there is no fear that it will flow through the protruding part and spill out from the outer peripheral wall of the casing. Insulating resin can be injected into both the DC high voltage generation block and the resistor block housing at the same time, so only one nozzle is required, and it saves time and process compared to injecting into each housing separately. Moreover, since the height of this protrusion can be used as a guideline for the amount of resin to be injected, it is also possible to prevent variations in the amount of resin to be injected.

It has many features such as.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a high voltage output circuit for a television receiver used with a conventional focus voltage dividing resistor, FIG. 2 is a partially cutaway perspective view of an example of a conventional focus voltage dividing resistor, 3 to 5 are perspective views showing one embodiment of a focus voltage dividing resistor block used in one embodiment of the DC high voltage generator with resistor according to the present invention in the order of manufacturing steps, and FIG. A perspective view of one embodiment of a Cockcroft-type DC high voltage generation block used in the device of the present invention, and FIGS. FIG. 10 shows a plan view of the resistor block and the DC high voltage generating block assembled in the exterior case, a perspective view showing the state in which resin is injected into the resistor block, and a perspective view showing the state in which the resin is injected and hardened. Partial cut-away plan view of one embodiment of the device of the present invention, 1st
FIG. 1 is a diagram showing a high voltage output circuit for television reception to which the device of the present invention is applied. 10...Alumina substrate, 17...Sliding device, 18...Holder, 19...Resistor block for focus voltage division. Ch, 21...Butsing, 26...
Cockcroft type DC high voltage generation block, 30...
...Exterior case, 36...Protrusion, 40...
...Outer peripheral wall, 41...Protrusion, 42...
...Claw part, 43...Groove, 51...Nozzle,
52... Resin for electrical insulation, 54... DC high voltage generator with resistor. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 (A) Figure 7 [B] Figure 8 Figure 9 Figure 10 Figure 11

Claims (1)

[Claims] 1 A resistance circuit combining a fixed resistance part and a variable resistance resistance part is formed on an insulating substrate, and a sliding device having a sliding contact and a rotating shaft that comes into sliding contact with the variable resistance resistance part is mounted on a holder. A resistor block mounted on the insulating substrate by a resistor block, a DC high voltage generation block consisting of a circuit element that generates DC high voltage, and each housing in which the DC high voltage generation block and the resistor block are isolated from each other by a protrusion. The housing consists of a housing into which electrical insulating resin is poured after being stored in the housing, and the height of the protruding part of the housing is lower than the outer peripheral wall of the housing, and a gap is provided on the back side of the protruding part. Further, a notch is formed in a part of the outer wall of the storage portion of the housing that stores the resistor block, and engages with the peripheral edge of the holder in order to cause the rotating shaft to protrude outside the housing. A DC high voltage generator with a resistor, which is characterized by: