KR100267389B1 - The apparatus for controlling the auto-degaussing of television - Google Patents

Abstract

PURPOSE: An automatic degaussing control apparatus is provided to prevent a television from being influenced by a magnetic field from a magnetic body by performing a device effect using an additional degaussing coil when a magnetic field is detected from a magnetic body located around the television. CONSTITUTION: An automatic degaussing control apparatus applies a device current to a degaussing coil wound around a CRT apparatus to perform a device effect. An additional degaussing coil(7') is in parallel connected to the degaussing coil to perform a device effect. A magnetic field sensor(12) detects a magnetic field from a magnetic body(10) located near a corresponding television. A controller(14) controls the device effect of the degaussing coil by means of the power control operation for the television and also controls the device effect for the additional degaussing coil(7') when a magnetic field is detected by the magnetic field sensor(12). A transistor(22) is driven by a degaussing control signal for the magnetic field of the magnetic body(10) from the controller(14). A relay(24) is activated by the transistor(22) and forms a power path from the supply power for the additional degaussing coil(7'). A degaussing controller(20) applies a device current to the additional degaussing coil to perform a device effect under the control of the controller upon detection of the magnetic field of the magnetic body.

Description

Automatic degaussing controls on television

1 is a diagram for explaining a power supply system to which a degaussing coil applied to a television is electrically connected;

2 is a block diagram showing an automatic degaussing control apparatus for a television according to a preferred embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1, 3, 5: capacitor 2: transformer

4: rectification part 6: positioner

7: degaussing coil 10: magnetic material

12: magnetic field sensor 14: control unit

16: power supply unit 18: AND circuit unit

20: degaussing control unit 22: transistor

24: relay

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic degaussing control apparatus for a television, and in particular, detects a magnetic field from a magnetic body located adjacent to the television and automatically demagnetizes the element current to the degaussing coil so that the CRT device of the television is not affected by the magnetic body. It relates to an automatic degaussing control device for a television which controls the device operation to be performed by applying.

In general, since a shadow mask is formed of a metal material, the shadow mask acts to transmit the electron beam of the CRT apparatus to reach the fluorescent point corresponding to the image signal of the color electron beam. An influence of a magnetic field is applied to the shadow mask in the direction of scalding. Therefore, even if the purity of the television is properly fixed, if the direction of the television is changed, the color electron beam does not normally penetrate the shadow mask due to the influence of the residual magnetism of the shadow mask, resulting in deterioration of the purity.

Therefore, even when the direction of the television is changed by the degaussing coil having the element action to exclude the influence of the shadow mask by the residual magnetism around the CRT device of the television, the color electron beam is not adversely affected by the geomagnetism. To be avoided.

1 is a diagram showing a power supply system of a television to which such degaussing coils are electrically connected. A capacitor 1, a transformer for transformer 2, and a capacitor 3 are connected to an input terminal ACin of an AC power source. A rear end of the capacitor 3 is connected to a rectifier 4 and a capacitor 5 of a bridge diode configuration for rectifying and smoothing the power transformed by the transformer 2 to a DC component of a constant level. The transistor 6 and the degaussing coil 7 are electrically connected between the capacitor 3 and the rectifier 4 so as to element residual magnetic components by the geomagnetism when the power is turned on.

Therefore, according to the power supply system of such a television, the power is turned on by the capacitors 1 and 3 and the transformer 2 when the power is turned on, and the transformed power is supplied by the rectifier 4 and the capacitor 5 by direct current (DC). Component is rectified and smoothed, and applied to the load of the television as an operating power source, and when such power is turned on, a current is applied to the degaussing coil 7 through the transistor 6 to determinate the residual magnetic component of the shadow mask of the CRT apparatus. Flows to perform the device action on the CRT device. That is, when the AC power is initially applied, the resistor 6 maintains its resistance value to a minimum so that sufficient device current flows through the degaussing coil 7, and as the time passes, the resistor 6 When the resistance value of C) increases gradually to show an almost infinite resistance value, the current flowing through the degaussing coil 7 gradually decreases to be maintained at almost zero potential, and during the change of the current, the degaussing coil ( The device current acting on 7) is attenuated and vibrated so that the alternating magnetic potentials are expressed, thereby demagnetizing the magnetic components of the CRT device including the shadow mask.

However, even when the device acts on the geomagnetic component by the degaussing coil 7 at the time of power-on of such a television, if a magnetic field from a magnetic body adjacent to the television affects the CRT device of the television, the television has an adverse effect on the television. The things that are given will occur. That is, when the audio speaker is located in close proximity to the television, for example, the magnetic field affects the CRT apparatus of the television from the permanent magnets provided in the audio speaker, resulting in discoloration of the color screen.

Accordingly, the present invention has been made in view of the above circumstances, and when a magnetic field is detected from a magnetic body located near the television in the state where power is applied after the device action is performed by the degaussing coil, a separate degaussing coil It is an object of the present invention to provide an automatic degaussing control apparatus for a television, which performs the device action by the device and prevents the television from being affected by the magnetic field from the magnetic material.

In order to achieve the above object, according to a preferred embodiment of the present invention, a degaussing coil in a television configured to apply a device current to a degaussing coil wound around a CRT apparatus to perform a device function when the power is turned on. Additional degaussing coils connected in parallel with each other to perform device functions, magnetic field sensing means for detecting a magnetic field from a magnetic body located adjacent to the television, and demaggging coils by means of a power supply control operation to the television. Control means for controlling the device action on the additional degaussing coil when the magnetic field is detected by the magnetic field sensing means, by the power control signal of the power supply means by the control means and by the magnetic field sensing means Logic circuit means for processing the magnetic field when the magnetic field is detected and applying it to the control means, from the magnetic material An automatic degaussing control apparatus for a television comprising a degaussing control means for applying a device current to the additional degaussing coil under the control of the control means to perform a device action upon detection of a magnetic field of the magnetic field.

The logic circuit means is constituted by an AND circuit which performs a logic AND process on the power ON signal of the power supply means by the control means and the detection signal of the magnetic field from the magnetic body by the magnetic field sensing means and provides it to the control means.

Further, the degaussing control means is a transistor operated by the degaussing control signal for the magnetic field of the magnetic body from the control means and is activated during operation of the transistor from the power supply means for the additional degaussing coil. It consists of a relay that acts to form a power path.

According to the automatic degaussing control apparatus for a television according to the present invention configured as described above, an additional degaussing coil is installed in parallel with the degaussing coil which performs the degaussing action when the television is turned on. When a magnetic field is detected from the magnetic body, the power from the power source means is applied to the additional degaussing coil for the additional degaussing coil, thereby eliminating the influence of the magnetic field from the magnetic field as well as the geomagnetic.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

FIG. 2 shows parallel connection of an additional resistor 6 'and a degaussing coil 7' to a degaussing coil 7 electrically connected to the power supply system of the television shown in FIG. When the magnetic field is detected from the magnetic material adjacent to the television in the state in which the element action is performed by the degaussing coil 7 when the power is turned on, the degaussing coil 7 'degaussing is performed. As a block diagram of an automatic degaussing control apparatus for a television according to the present invention, which is configured to be performed, reference numeral 10 is located adjacent to the television, for example, an audio speaker or a permanent magnet, which magnetically affects the CRT apparatus of the television. The magnetic body of the back is collectively represented, and 12 denotes a magnetic field sensor which detects a magnetic field from the magnetic body 10 and converts it into an electrical signal.

14 not only controls the overall function assigned to the television, but also controls the power supply unit 16 collectively showing the configuration shown in FIG. A control unit which controls to generate, while controlling the initial device action by the degaussing coil 7, according to the present invention, the control unit 14 is controlled from the adjacent magnetic body 10 by the magnetic field sensor 12. When the magnetic field is detected, the element action is also controlled to the magnetic field from the magnetic body 10.

18 logically processes a power control signal applied from the control unit 14 to the power supply unit 16 and an electrical signal of the magnetic field detected by the magnetic field sensor 12 to decode the magnetic field from the magnetic body 10. An AND circuit section for providing a signal relating to a Gaussing action to the control section 14 is shown.

20 is a degaussing control unit which performs an element action on the magnetic field from the magnetic body 10 by the additional degaussing coil 7 'under the control of the control unit 14, the degaussing control unit. 20 is activated by the degaussing control signal from the control unit 14 to the degaussing control signal for the magnetic field of the magnetic body 10 and the additional degaussing coil ( And a relay 24 which acts to form a power path from the power supply 16 to 7 '). Here, the collector side of the transistor 22 is connected to the power supply Vcc, the emitter side is connected to the relay coil side of the relay 24, and the base thereof is the element control signal output OA side of the control unit 14. Is connected to. In addition, the contact point of the relay 24 is connected so that the device current is applied by the power supply unit 16 (not shown in detail; connected in parallel to the transistor 6 and the degaussing coil 7 of FIG. 1). It is interposed on the current path for the additional degaussing coil 7'to switchably control the path of the device current for the degaussing coil 7 '.

According to the automatic degaussing control apparatus for a television according to the present invention configured as described above, first, when the power ON signal ON is applied from the control unit 14 to the power supply unit 16, the initial degaussing operation is stopped. It is performed by the degaussing coil 7 described with reference to FIG.

In such a state, when the magnetic body 10 is positioned adjacent to the television, when the magnetic field from the magnetic body 10 is detected by the magnetic field sensor 12, the magnetic body 10 detected by the magnetic field sensor 12 is detected. The magnetic field sensing signal from is applied to the AND circuit section 18. The AND circuit unit 18 is a state in which the power ON signal to the power supply unit 16 is applied from the control unit 14, so that the AND circuit unit 18 generates a magnetic field by the power ON signal and the magnetic field sensor 12. The logic signal is ANDed on the sensing signal to apply a high level signal to the controller 14.

Thus, the control unit 14 is operated by the additional degaussing coil 7 'apart from the initial device action by the degaussing coil 7 executed in the power-on state by the power supply unit 16. The control signal for controlling the action is output from the output side OA.

When a control signal of the element action applied from the control unit 14 is applied to the transistor 22 of the degaussing control unit 20, the transistor 22 is operated and the power source (B) is operated by the operation of the transistor 22. The contact of the relay 24 interposed on the power path for the additional degaussing coil 7 'which is activated by the relay coil of the relay 24 to which Vcc) is applied and electrically connected to the power supply 16. The connected current is applied to the additional degaussing coil 7 'and the transistor 6' from the power supply section 16, and thus the additional degaussing coil 7 'is applied. The device acts on the magnetic field sensed from the magnetic body 10.

As described above, according to the automatic degaussing control apparatus for a television according to the present invention, an additional degaussing coil is provided in parallel with a degaussing coil which performs degaussing when the television is turned on. When a magnetic field is detected from a magnetic body adjacent to the power, the power from the power supply means is applied to the additional degaussing coil for the additional degaussing coil, thereby eliminating the influence of the magnetic field from the adjacent magnetic body as well as the geomagnetism. Accordingly, adverse effects such as discoloration of the color screen by the magnetic field from the magnetic body adjacent to the television can be eliminated, thereby ensuring the best image quality.

Claims (3)

In a television configured to perform a device function by applying a device current to a degaussing coil wound around a CRT device when the power is turned on, An additional degaussing coil connected in parallel with the degaussing coil to perform device functions; Magnetic field detection means for detecting a magnetic field from a magnetic body located adjacent to the television, Control means for controlling the device action of the degaussing coil by a power supply control operation to the television and controlling the device action for the additional degaussing coil when a magnetic field is detected by the magnetic field sensing means; Logic circuit means for performing a logic process of the power control signal of the power supply means by the control means and a magnetic field when the magnetic field is detected by the magnetic field sensing means, and applying it to the control means; And a degaussing control means for applying a device current to the additional degaussing coil under the control of the control means when detecting a magnetic field from the magnetic material so as to perform a device action. Singh control unit. The method of claim 1, And said logic circuit means comprises an AND circuit for performing a logic AND process on a power ON signal of a power supply means by said control means and a detection signal of a magnetic field from a magnetic body by said magnetic field sensing means. Device. The degaussing control means according to claim 1, wherein said degaussing control means is activated by a degaussing control signal from said control means to a magnetic field of a magnetic body and is activated during operation of said transistor for said additional degaussing coil. An automatic degaussing control device for a television, characterized in that it comprises a relay which acts to form a power path from the power supply means.