KR100192611B1 - Degaussing circuit of television for a vehicle - Google Patents

Abstract

The present invention relates to a degaussing circuit of a vehicle television, the configuration of which is based on a steering angle detection sensor (50) for detecting a steering angle of the vehicle steering wheel and a steering angle detected from the steering angle detection sensor (50). From the rotation angle judging unit 60 and the switch signal applied from the power switch 10 and the rotation angle judging unit 60 which output a predetermined determination signal when the rotation angle is determined and the rotation angle is equal to or larger than a preset value. The microcomputer 62 outputs a drive signal for driving the device coil DG based on the determination signal applied thereto, and the device coil DG is driven based on a drive signal output from the microcomputer 62. It comprises a device coil driving unit 70 for controlling the state, the steering angle detection sensor is configured in one piece with the handle shaft is formed integrally with the handle is rotated in response to the handle operation And a hall sensor having a plurality of holes formed at equal intervals therein, and a male / light emitting device for detecting a steering angle of the handle by detecting a hole of the hall sensor, wherein the television is turned on. In addition, even when the steering wheel of the vehicle is rotated more than a predetermined angle (소자) operation is made.

Description

Degaussing Circuit of Car Television

1 is a circuit diagram showing the configuration of a degaussing circuit of a conventional television.

2 is a diagram showing a configuration of a degaussing circuit of a vehicle television according to an embodiment of the present invention.

3 is a partially enlarged cross-sectional view showing a configuration example of the steering angle detection sensor shown in FIG.

FIG. 4 is an enlarged perspective view of the main portion showing a configuration example of the steering angle detection sensor shown in FIG. 2. FIG.

(A) of FIG. 5 is a diagram showing the current characteristics flowing in the device coil,

(b) is a diagram showing the resistance characteristics of the positive electrode;

(c) is a diagram showing how the element coil is mounted on the CRT.

* Explanation of symbols for main parts of the drawings

10: power switch 20: fuse

30: line filter 40: Wheatstone bridge rectifier circuit

50: steering angle detection sensor 60: rotation angle determination unit

62: microcomputer 70: element coil drive unit

C1 to C3: Capacitor R: Resistance

Q: Transistor PO: Posistor

RY: Relay DG: Digaussing coil

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a degaussing circuit of a vehicular television, and more particularly, in a television installed in a vehicular television, an element is operated even when the steering wheel of the vehicular is rotated by a predetermined angle or more, except when the television is turned on. It relates to a degaussing circuit of a vehicular television to make this happen.

As is well known, the shadow mask, which plays the most important role in bringing each of the three electron beams to the corresponding fluorescent point only, is made of iron plate, so that the shadow mask is directed in the direction of geomagnetism determined by the installation position of the television. Become magnetized. Thus, even in a television in which color purity is precisely adjusted in such a state, there is a problem that when the installation direction is changed, the electron beam from the electron gun is bent due to the residual magnetism generated in the shadow mask, thereby degrading the color purity.

On the other hand, according to the magnetic molecular theory, a magnetic body such as iron becomes magnetic when the magnetic axes of magnetic molecules constituting the magnetic body are arranged in the same direction by an external magnetic field, and when the arrangement is scattered, the magnetic material does not appear to the outside. Even though the external magnetic field is removed, the magnetic molecules are arranged as they are called residual magnetics. To eliminate the external magnetic field, the array must be scattered so that the magnetic field is gradually weakened by putting the magnetized into the alternating magnetic field.

Then, in the alternating magnetic field, the magnetic molecules change in the direction of 180 ° every half cycle, and as they are repeated, they are gradually weakened, and finally, the arrangement of the magnetic molecules is scattered so that the residual magnetic disappears.

Therefore, a degaussing coil is installed on the CRT circumference of a general television, as shown in FIG.

The prior art of the present invention will be described with reference to the accompanying drawings.

1 is a circuit diagram showing the configuration of a degaussing circuit of a conventional television, in which the degaussing circuit is a line filter for attenuating noise included in a power switch 10, a fuse 20, and an AC input power source. 30, the Wheatstone bridge circuit 40 for full-wave rectification of the AC input power consisting of a plurality of diodes, a resistor (PO), the resistance gradually increases when the temperature of the thermal resistance element increases, the CRT circumference of the television A coil group installed in the coil is provided with a device coil (DG) for demagnetizing magnetism due to a geomagnetism or a disturbance magnet such as a shadow mast, an attachment tool, and a cabinet.

The operation of the degaussing circuit of the conventional television constructed as described above will be described.

As shown in FIG. 1, when the viewer turns on the power switch 10, AC power input through the power plug is connected to the capacitor C1, the line filter 30, and the capacitor C2 via the fuse 20. ) Is attenuated once and then applied to the po.

The AC power applied to the transistor PO is applied to the element coil DG through the transistor PO, so that magnetization is prevented by the element coil DG.

Here, the resistor PO has a small resistance when AC power is initially applied as shown in (c) of FIG. 5 to which the element PO is attached, as shown in (a) of FIG. DG) flows a lot of alternating current, and then, as time passes, the current applied to the pore increases and the temperature of the pore increases, thereby increasing the resistance of the pore gradually. The current flowing through the element coil DG becomes infinity and gradually decreases to almost zero as shown in FIG.

At this time, the alternating magnetic field is generated by the coil effect due to the attenuated alternating current flowing through the device coil DG, and the molecular stones existing in the shadow mast and other fittings are disturbed and scattered to lose magnetic. .

However, in the degaussing circuit of such a conventional television, since the device coil performs the device operation for a predetermined time (that is, about 10 seconds when a current is applied to the device coil) when the viewer turns on the power switch, a vehicle is generally used. In the case of a TV installed in the TV, the installation state of the television is unstable frequently due to the vibration of the body after the TV is turned on. Therefore, the magnetism is demagnetized and the color purity is not reduced. There was this.

Accordingly, the present invention has been made in view of the above circumstances, and in a vehicle television, when the rotation angle of the vehicle steering wheel is detected and the rotation angle is greater than or equal to a certain angle, the element coil of the television can drive the magnetized magnetism. It is an object of the present invention to provide a degaussing circuit of a vehicle television.

According to an embodiment of the present invention for realizing the above object, the shadow mask is magnetized by magnetism such as geomagnetism and the like, and the electron beam from the electron gun is deflected by the magnetic field so as to collide with other fluorescent points to prevent color purity from deteriorating. In the circuit having the element coil around the CRT, the steering angle detection sensor detects the steering angle of the steering wheel of the vehicle, and the rotation angle of the steering wheel is determined based on the steering angle detected from the steering angle detection sensor. If it is, the microcomputer outputs a drive signal for driving the element coil based on the rotation angle judging unit outputting a predetermined determination signal, the switch signal applied from the power switch, and the determination signal applied from the rotation angle judging unit. And a driving image of the device coil based on a driving signal output from the microcomputer. It comprises a device coil driving unit for controlling the steering angle detection sensor is integrally formed with the handle shaft configured integrally with the handle is rotated in response to the handle operation and a plurality of holes are formed at equal intervals therein There is provided a degaussing circuit for a vehicle television comprising a hall sensor and a male / light emitting element for detecting a steering angle of the steering wheel by sensing a hall of the hall sensor.

According to the degaussing circuit of a vehicular television according to an embodiment of the present invention having the above-described configuration, in a vehicular television, an element coil is driven and magnetized for a predetermined time when a driver turns on the television. In addition, even when the steering wheel of the vehicle is rotated by a predetermined angle or more, the device coil is driven for a predetermined time to provide a high-definition image to the viewer by demagnetizing the magnetized magnetism.

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

2 is a view showing the configuration of the degaussing circuit of a vehicle television according to an embodiment of the present invention, the same reference numerals are assigned to components that perform the same function as the above-described first embodiment and detailed description thereof It will be omitted.

In the figure, reference numeral 50 denotes a steering angle detection sensor for detecting a steering angle of a vehicle steering wheel, and 60 denotes a rotation angle of the vehicle engine based on a steering angle detected by the steering angle detection sensor 50 to determine a predetermined determination signal. The rotation angle determiner outputs, and 62 is operated based on the standby power source ST, and is based on a switch signal applied from the power switch 10 and a determination signal applied from the rotation angle determiner 60. The microcomputer outputs a predetermined voltage level signal to the element coil driver 70 to be described later.

Further, reference numeral 70 denotes a coil in a relay RY in which a base end is connected via the output terminal of the microcomputer 62 and a resistor R, and the collector end is connected to an input terminal of a DC voltage Vcc at the other end. The relay RY connected in series between the transistor Q, which is connected to the emitter terminal, and the connection point A of the capacitor C2 and the Wheatstone bridge rectifier circuit 40 and the element coil DG. It is composed of a switch (PO) and a switch (PO) in the relay (RY) that is switched by the magnet generated from the coil in the drive control of the element coil (DG) based on the voltage level signal output from the microcomputer (62) Element coil drive unit.

3 and 4 illustrate a configuration example of a steering angle detection sensor, wherein the steering angle detection sensor 50 is integrally formed with a handle 51 for changing a driving direction of a vehicle, thereby applying kinetic energy to a steering gear (not shown). In the handle shaft 52 for transmission, 36 hall sensors 53 are formed integrally with a plurality of holes 54 formed at equal intervals, for example, every 10 ° at predetermined positions of the handle shaft 52. .

In addition, a light receiving element 56 and a light emitting element 57 for detecting a steering degree of the handle 51 through a hole 54 formed on the hall sensor 53 when the handle 51 is rotated are embedded. The shaft case 55 is formed around the Hall sensor 53.

Here, when the optical signal emitted from the light emitting element 57 is received at the light receiving element 56 in the shaft case 55, the rotation angle judging unit outputs a signal according to the reception state of the optical signal at the light receiving element 56. (60).

Next, the operation of the degaussing circuit of the vehicle television according to the embodiment of the present invention having the above-described configuration will be described in detail.

First, when the driver turns on the power switch 10, the switch signal from the power switch 10 is applied to the microcomputer 62, and accordingly, the microcomputer 62 generates a 'high' voltage signal from the element coil driver. 70 is applied.

On the other hand, in the element coil driving unit 70, the transistor Q is conducted by the 'high' voltage signal applied to the base terminal through the resistor R, thereby forming a current path, whereby the transistor Q is formed. The current flows through the coil in the relay RY connected to the collector end of the magnetic field to form magnetism, and the switch in the relay RY is turned on.

Therefore, the AC power input through the power plug is first applied to the capacitor PO after the noise is attenuated while passing through the capacitor C1, the line filter 30, and the capacitor C2 via the fuse 20, AC power applied to the transistor (PO) is applied to the device coil (DG) via the transistor (PO) to drive the device coil (DG) for about 10 seconds for a predetermined time.

On the other hand, when the steering wheel 51 is operated in the driving direction by the driver while the driving of the element coil DG is stopped after the predetermined time has elapsed, the steering wheel shaft 52 integrally formed with the steering wheel 51 is It is rotated in the corresponding driving direction. Accordingly, the hall sensor 53 integrally formed with the handle shaft 52 is also rotated in the corresponding driving direction.

Accordingly, the hole 54 formed in the hall sensor 53 is moved by the rotation of the hall sensor 53, and is emitted from the light emitting element 57 according to the movement of the hole 54 to receive the light. The rotation angle determining unit 60 determines the rotation angle of the handle 51 based on the optical signal state received by the device 56.

When the rotation angle of the handle 51 determined by the rotation angle determination unit 60 is determined to be equal to or greater than a predetermined angle, the rotation angle determination unit 60 applies a predetermined determination signal to the microcomputer 62. The microcomputer 62 applies a 'high' voltage signal to the element coil driver 70 based on the determination signal.

In contrast, the element coil driver 70 conducts a current path by conducting a transistor Q therein due to a 'high' voltage signal applied from the microcomputer 62, so that the transistor Q conducts. The current is applied to the coil in the relay RY by the current path formed to turn on the switch in the relay RY.

Therefore, the AC power input through the power plug passes through the capacitor C1, the line filter 30, and the capacitor C2 via the fuse 20, and then a resistor (B) through the switch in the relay RY. PO and element coil DG are applied to the element coil DG for about 10 seconds for a predetermined time.

That is, the element coil DG is operated not only for a predetermined time from the time when the power switch 10 is turned on but also for a predetermined time even when the handle is rotated by a predetermined angle and becomes unstable due to shaking of the installation state of the television. do.

As described above, according to the degaussing circuit of a vehicular television according to an embodiment of the present invention, in the vehicular television, when the driver's steering wheel is operated, the steering wheel steering angle is detected and the element coil is deformed when the rotation angle of the steering wheel is a certain angle or more. When the vehicle swings, the television shakes to demagnetize the magnet that is magnetized on the shadow mask.

Therefore, it is possible to always provide a clear picture quality even while driving.

Claims (1)

In a circuit provided with a device coil (DG) around a CRT to prevent the shadow mask from being magnetized by magnetism such as a geomagnetism, the electron beam from the electron gun is deflected by the magnetic field, colliding with other fluorescent points and degrading color purity. The steering angle detection sensor 50 detects the steering angle of the steering wheel and the steering angle detected by the steering angle detection sensor 50 to determine the rotation angle of the steering wheel. A drive for driving the element coil DG based on the output rotation angle determiner 60, a switch signal applied from the power switch 10, and a determination signal applied from the rotation angle determiner 60; A microcomputer 62 for outputting a signal and a device coil driver 7 for controlling a driving state of the device coil DG based on a drive signal output from the microcomputer 62. 0), wherein the steering angle detection sensor 50 is integrally formed with the handle shaft 52, which is integrally formed with the handle 51, and rotates in response to the manipulation of the handle 51. And a light sensor 56 for detecting the steering angle of the handle 51 by detecting the hall sensor 53 having a plurality of holes 54 and the hole 54 of the hall sensor 53. 57) a degaussing circuit for a vehicle television, comprising: a.