JPH04123517U - flyback transformer - Google Patents

Abstract

(57) [Summary] [Purpose] To improve focus followability by adjusting the distributed capacitance between the coil parts of each layer of a multilayer high-voltage coil that constitutes a flyback transformer. [Structure] The thickness of the insulating layer 13 between the lower coil parts 4a to 4c of the laminated high voltage coil 3 constituting the flyback transformer and the insulating layer 14 between the upper coil parts 4c to 4e.
The distributed capacitance between the lower coil parts 4a to 4c and the distributed capacitance between the upper coil parts 4c to 4e are made different by changing the thickness of the high voltage coil 3, so that the distributed capacitance of the high voltage coil 3 is optimized for focus followability. This improves the ability of the focus adjustment voltage to follow changes in the high output voltage.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention uses a resistor circuit that adjusts and sets the focus adjustment voltage in the middle part of the high-voltage coil. This relates to the flyback transformer to which the is connected.

0002

[Conventional technology]

Figure 3 shows a typical flyback transformer circuit with a laminated high-voltage coil. It is shown. In the same figure, a low voltage coil 2 is fitted into a core 1, and this low voltage coil 2 is fitted into a core 1. A high voltage coil 3 is fitted on the outside of the coil 2.

0003 The high-voltage coil 3 is provided with an insulating layer such as polyester on the winding body of the high-voltage bobbin. Coil parts 4a to 4e are laminated through an insulating film, and each coil part 4a to 4d is Add the voltage between the end of the winding and the start of winding of the coil parts 4b to 4e of the next layer. They are connected in series via forward rectifier diodes 5a to 5d. final stage The output end of the coil portion 4e is connected to a cathode (not shown) via a high voltage rectifier diode 6. Connected to the anode of the wire tube. Then, in the middle part of the high voltage coil 3, in the example of FIG. focuses using the focus adjustment voltage terminal on the cathode side of the rectifier diode 5c. A resistor circuit of Spack 7 is connected. This resistor circuit is a focus adjustment resistor. It has an antibody 8 and a screen adjustment resistor 10, and the focus adjustment resistor 8 is slidable. The focus adjustment voltage is set by slidingly adjusting terminal 11. A focused adjustment voltage is applied to the focus electrode of the cathode ray tube, and similarly the screen By slidingly adjusting the sliding terminal 12 of the screen adjustment resistor 10, the screen adjustment voltage can be adjusted. voltage is set, and the set screen adjustment voltage is applied to the screen electrode of the cathode ray tube. added to.

0004

[Problem that the idea aims to solve]

Generally, when the brightness of a cathode ray tube screen changes, for example from a dark screen to a bright screen, , a high voltage output current flows from the high voltage coil 3 side to the cathode ray tube, and the high voltage output voltage E_Hdescends This phenomenon occurs. At this time, focus adjustment voltage E_FAlso high voltage output voltage E _H changes according to changes in This high voltage output voltage E_HRate of change and focus Adjustment voltage E_FWhen the rate of change of E is equal to the rate of change of the focus adjustment voltage E _F is the high voltage output voltage E_HThe focus may be blurred when the camera completely follows the changes in the However, in reality, each coil of the high voltage coil 3 There are variations in characteristics such as interlayer distributed capacitance of the layer portions 4a to 4e, and due to this, Variations occur in the regulation characteristics of the coil parts 4a to 4e, and the high voltage output voltage E_HFocus adjustment voltage E for changes in_FThe followability of curve A in Fig. 2 becomes worse. As shown in , the focus adjustment voltage E depends on the magnitude of the high voltage output current._Fand high pressure force voltage E_HFor example, when the screen changes from a bright screen to a dark screen, the ratio of When this happens, the problem arises that the focus becomes blurred.

[0005] This invention was made to solve the above conventional problems, and its purpose is to: Improves the followability of the focus adjustment voltage to the high voltage output voltage, and improves the tracking of the focus adjustment voltage to the high voltage output voltage. Flyback transformer that does not lose focus due to brightness changes Our goal is to provide the following.

[0006]

[Means to solve the problem]

In order to achieve the above object, the present invention is constructed as follows. That is, In this invention, high-voltage coils are laminated and wound around a high-voltage bobbin with an insulating layer interposed between the coils of each layer. The winding end of the coil section is the same as the winding start end of the next layer's coil section in the order in which the pulse voltage is added. The middle part of the high voltage coil is connected through a rectifier diode in the direction of the In a flyback transformer equipped with a cass regulating voltage terminal, the coils in each layer The insulating layer formed between the coil parts has a thickness or dielectric strength that differs from the insulating layer of the adjacent coil part. It is characterized by being constructed by arranging one or more layers with different ratios.

[0007]

[Effect]

In the present invention having the above configuration, each of the high voltage coils constituting the flyback transformer is The distributed capacitance between the coil parts changes the thickness of the insulation layer between the coil parts or the dielectric constant of the insulation layer. It changes depending on the situation. By consciously changing the distributed capacitance between these coil parts, high-voltage coil By adjusting the distributed capacitance of the focus control voltage, the focus adjustment voltage can be added to the high voltage output voltage. Compliance will be improved.

[0008]

【Example】

Hereinafter, embodiments of the present invention will be described based on the drawings. In addition, in the explanation of this example, The same reference numerals are given to the same name parts as in the conventional example, and detailed redundant explanations are omitted. do. Figure 1 shows the circuit configuration of an embodiment of a flyback transformer according to the present invention. It is. The characteristic feature of this embodiment is that each coil portion 4a to 4 of the high voltage coil 3 By changing the thickness of the insulating layer 13 between c and the insulating layer 14 between coil parts 4c to 4e, the lower layer side This is because the interlayer distributed capacitance and the upper layer side interlayer distributed capacitance are configured differently. The other configurations are the same as the conventional example. In this example, the insulating layer 13 is made of polyethylene with a thickness of 0.8 mm. The insulating layer 14 is formed by an ester film layer, and the insulating layer 14 is made of a polyester film with a thickness of 0.2 mm. It is composed of the rum layer.

In this way, by changing the thickness of the insulating layers 13 and 14, the interlayer distributed capacitance between the lower coil portions 4a to 4c and the interlayer distributed capacitance between the upper coil portions 4c to 4e are intentionally adjusted. This changes the overall distributed capacitance of the high voltage coil 3. This change in distributed capacitance makes it possible to adjust the regulation characteristics of the high-voltage coil 3, and accordingly, it is possible to improve the focus followability characteristics of the focus adjustment voltage E _F with respect to the high-voltage output voltage E _H.

0010 Characteristic test of followability of focus adjustment voltage using the high voltage coil 3 of the present example As a result, curve B in FIG. 2 was obtained. The focus followability of this example is compared to that of the conventional frame. As is clear from the comparison with the focus followability curve A of the Ryback transformer, In the flyback transformer of this embodiment, the focus adjustment voltage E_Fand high voltage output voltage E _H The ratio approaches a constant value as the high voltage output current changes, and focus tracking It can be seen that the performance has been significantly improved.

[0011] Therefore, according to the flyback transformer of this embodiment, the brightness of the screen of the cathode ray tube is You can enjoy high-quality screens without losing focus due to changes in the degree of focus. Obtainable.

0012 It should be noted that the present invention is not limited to the above embodiments, and may be implemented in various ways. obtain. For example, in the above embodiment, the thickness of the insulating layer between the coil parts 4a to 4c and the thickness of the coil part The thickness of the insulating layer between 4c and 4e is changed, but the thickness of this insulating layer is It is necessary to make changes to optimize the scrap followability, and various changes other than this example are required. It is possible to vary the insulation layer thickness between the coil parts of each layer depending on the configuration, e.g. In some cases, the thickness of the insulation layer between the coil parts of each layer can be made different. .

[0013] Furthermore, in the above embodiment, the films of the insulating layers are formed of the same material, and each layer is made of the same material. The dielectric constant of the film was made the same, but the thickness of the insulating layer between the coil parts of each layer was made the same. By changing the material of the insulating film between each coil part and changing the dielectric constant, By changing the distributed capacitance between each coil section, the distributed capacitance with the best focus tracking performance can be obtained. It may be configured so that Generally, polyester film is manufactured at a driving frequency of 1KHz and a temperature of 1KHz. The dielectric constant is 3.3 at 25°C, and polyphenylene sulfide has a dielectric constant of 3.3 under the same conditions. The dielectric constant is 3.0, and the dielectric constant depends on the type of insulating film used as the insulating layer. By adjusting the dielectric constant of the insulating layer of each layer, the focus can be adjusted. A flyback transformer with excellent followability can be obtained.

[0014]

[Effect of the idea]

The present invention is based on the thickness of the insulating layer formed between the coil parts of each layer of the high-voltage coil or the dielectric It is configured to adjust the distributed capacitance between each coil section by varying the ratio by one or more layers. Therefore, distributed capacitance is used to optimize focus followability for high output voltage. This makes it possible to improve the brightness caused by changes in the brightness of the cathode ray tube screen. A high-quality flyback transformer that does not cause out-of-focus It becomes possible to provide

[Brief explanation of drawings]

FIG. 1 is a sectional view of essential parts showing an example of the configuration of a high-voltage coil of a flyback transformer according to the present invention.

FIG. 2 is a graph showing the focus followability of the flyback transformer of this embodiment in comparison with the focus followability of a conventional example.

FIG. 3 is a circuit diagram of a flyback transformer equipped with a conventional general focus pack.

[Explanation of symbols]

3 High voltage coil 4a~4e Coil part 13, 14 Insulating layer

Claims (1)

[Scope of utility model registration request] Claim 1: A high-voltage coil is laminated and wound around a high-voltage bobbin via an insulating layer, and the winding end of the coil section of each layer is a forward rectifier diode that adds a pulse voltage to the winding start end of the coil section of the next layer. In a flyback transformer in which a focus adjustment voltage terminal is provided in the middle part of the high-voltage coil, the insulating layer formed between the coil parts of each layer is connected to the insulating layer of the adjacent coil part. A flyback transformer characterized in that it is constructed by arranging layers at one or more locations having mutually different thicknesses or dielectric constants.