JPH09327014A - Monitor television unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the influence of a magnetic field generated by means of a deflective york at a transformer side and also to eliminate noise in an interphone call by permitting a magnetic flux direction generated from the transformer of a call line to orthogonally cross with the magnetic flux direction generated by means of the deflective york of a monitor TV. SOLUTION: A monitor TV unit U is provided with integrated structure where at least the monitor TV 1(CRT) indicated by a broken line is superimposed with a circuit substrate having the transformer T of the call line and the transformer T is arranged on the circuit substrate so as to permit the magnetic flux direction generated from the transformer T to orthogonal cross with the magnetic flux direction generated from the deflective york 1A which is successively provided at the lower part of the monitor TV 1. That is, the transformer T is arranged so as to permit the magnetic flux direction generated from the transformer T to be directed towards the starting point P of deflection in the deflective york 1a and, therefore, the both magnetic flux directions are orthogonaly crossed and mutual magnetic force is erased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a monitor television unit for displaying a visitor's image picked up by an image pickup camera incorporated in an intercom subunit.

[0002]

2. Description of the Related Art Conventionally, an image pickup camera is built in an intercom subunit installed at a doorway of a dwelling unit, and an image of a person (visitor) who operates a call button of the intercom subunit is installed in the dwell unit. An intercom system has become widespread in which an intercom call can be made by displaying an image on a screen of a monitor TV unit and responding by the monitor TV unit by using a built-in microphone, a speaker, and a handset while watching the displayed image.

Recently, monitor TV units used in the above-mentioned intercom system include:
A flat-panel CRT is used as a monitor TV, and a flat-panel CRT and a circuit board on which various electronic components are mounted are combined and integrated so as to be integrated with each other to achieve a thin and compact design.
4 and 5 show the main structure of this type of monitor television unit.

FIG. 4 shows a conventional monitor television unit 10.
It is the figure which looked at 0 from the front. As shown here, in the conventional monitor television unit 100, since the monitor television 101 indicated by the broken line and the circuit board having the transformer 102 of the communication circuit are arranged so as to overlap each other, the deflection of the monitor television 101 is prevented. In some cases, the magnetic field generated by the yoke 101a (indicated by the dashed-dotted concentric circles in the figure) adversely affects the transformer 102, and noise is generated during an interphone call.

Therefore, conventionally, the transformer 10 of the communication circuit has been used.
On the other hand, an electromagnetic shield was applied with a silicon steel plate to prevent noise during a call. FIG. 5 is a diagram showing the configuration of another transformer of the communication circuit.
Shows the view seen from the bottom. Even with such a configuration, as shown in (b), since the magnetic field generated from the deflection yoke 101a is also formed in the vertical direction, the transformer 1
02 is influenced by the deflection yoke 101a.

Double-headed arrows on the transformers 102 in FIGS. 4 and 5 indicate the directions of magnetic flux generated by the respective transformers 102.

[0007]

As described above, in the above conventional monitor TV unit, it is necessary to provide the electromagnetic shield to the transformer of the communication circuit so as not to be affected by the magnetic field from the deflection yoke of the monitor TV. It was Therefore, the present invention has been proposed in view of this point, and provides a monitor TV unit with a simple structure, which can prevent the transformer of the communication circuit from being affected by the magnetic field received from the deflection yoke of the monitor TV. It is an object.

[0008]

In order to achieve the above object, in a monitor television unit of the present invention, an inner case accommodating a monitor television is accommodated in a base provided with a transformer (transformer) of a communication circuit. A structure in which a cover having a display window is covered from above the base to be integrated, and the transformer is generated from the transformer when the inner case is housed in the base. The magnetic flux direction is
It is arranged so as to be orthogonal to the direction of the magnetic flux generated from the deflection yoke of the monitor TV. If the two magnetic flux directions are orthogonal to each other, they will not be affected by the magnetic fields of the other party, and especially on the transformer side where the magnetic force is small, there will be no influence of the magnetic field generated by the deflection yoke.

According to a second aspect of the present invention, the transformer is arranged so that, when the inner case is housed in the base, the direction of the magnetic flux generated from the transformer is toward the origin of deflection of the deflection yoke of the monitor television. . The deflection yoke forms a concentric magnetic field horizontally and vertically with respect to the monitor TV surface with the origin of deflection as the center, so the transformer is arranged so that the magnetic flux direction of the transformer is toward the center of the magnetic field. If so, the magnetic fluxes of both are orthogonal to each other and are not affected by the magnetic field.

In the third aspect, the transformer is arranged so as to be directly below the deflection yoke of the monitor television when the inner case is housed in the base. If the magnetic flux direction of the transformer mounted on the circuit board of the base is perpendicular to the monitor TV surface, if the transformer is arranged so as to be directly below the deflection yoke, the magnetic flux directions of both will be orthogonal.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view illustrating the internal structure of a monitor television unit U according to the present invention. This monitor TV unit U is at least
The monitor TV 1 (CRT) indicated by the broken line and the circuit board provided with the transformer T (transformer) of the communication circuit are overlapped with each other to form an integrated structure. When the transformer T is arranged on the circuit board so that the direction of the magnetic flux generated from the transformer T is orthogonal to the direction of the magnetic flux generated from the deflection yoke 1a connected to the lower portion of the monitor TV 1 when assembled. There are features.

Here, the magnetic field of the transformer T is generated in parallel with the circuit board, and the direction of the core is adjusted so that the direction indicated by the double-headed arrow line is the magnetic flux direction. The case where T is arranged is shown. The magnetic field of one of the deflection yokes 1a is formed in a concentric circle shape indicated by an alternate long and short dash line along the surface of the monitor TV centering on the origin P of vertical deflection.

As can be seen from the figure, the transformer T is
The direction of the magnetic flux generated from this transformer T is the deflection yoke 1
Since they are arranged so as to face the starting point P of the deflection of a, the magnetic flux directions of both are orthogonal to each other, so that the magnetic forces of each other are canceled out and are not affected by the magnetic field of the other party (see FIG. 4 for comparison). thing). Especially on the transformer T side where the magnetic force is small,
It is not necessary to be affected by the magnetic field generated by the deflection yoke 1a.
Therefore, if the transformer T of the communication circuit is arranged in such a manner, there is a hum sound (noise such as "boom" due to a harmonic component of the commercial power frequency) during the intercom communication due to the influence of the video output to the monitor TV 1. Noise does not occur.

FIG. 2 shows a case where the transformer of the speech communication circuit has another structure. 3A is a view of the monitor TV unit U viewed from the front, and FIG. 1B is a view viewed from the bottom. The transformer T ′ shown here is a transformer T ′ for insulating a communication circuit in which a magnetic field (double-headed arrow line) is generated perpendicularly to the circuit board K. Since the magnetic field of the deflection yoke 1a is formed concentrically in the vertical direction with the origin P of deflection as the center, as shown by the chain line, when the unit U is assembled, it is directly below the deflection yoke 1a. If the transformer T'on K is arranged, the magnetic flux directions of the two are orthogonal to each other (see FIG. 5 for comparison). That is, if the circuit board K on which the transformer T ′ is mounted is housed in the unit U in parallel with the monitor TV 1, when the transformer T ′ is arranged directly below the deflection yoke 1a, the transformer T ′ is arranged. The magnetic flux direction of 'is directed toward the starting point P of the deflection of the deflection yoke 1a, and the magnetic flux directions of both are orthogonal.

Next, an exploded perspective view of the monitor television unit U is shown in FIG. . The monitor TV unit U is a circuit board K in which an inner case 10 accommodating the monitor TV 1 is further mounted with a call circuit, a video circuit, a power supply circuit, and the like.
It is housed in a base 11 provided with (K1, K2), and is covered with a cover 12 from above the base 11 so as to be integrated.

Since the monitor TV 1 is designed to be exposed through the display window 12a formed on the cover 12,
When the resident operates the monitor button 12b, the image of the entrance can be confirmed on the screen. In the figure, 2 is a circuit board on which a control circuit is mounted. Also, the circuit board K1
Since K and K2 are housed in the base 11 in combination so that the recesses and the protrusions are engaged with each other, the unit U can be made thin.

[0017]

As can be understood from the above description, according to the monitor television unit of the first aspect, the direction of the magnetic flux generated from the transformer of the communication circuit is generated by the deflection yoke of the monitor television. Since it is orthogonal to the magnetic flux direction, the transformer side is not affected by the magnetic field generated by the deflection yoke, and noise during the intercom call can be prevented. Therefore, it is not necessary to provide an electromagnetic shield as in the conventional case, and the structure can be simplified.

According to the second aspect of the present invention, when the transformer of the communication circuit is arranged, the magnetic flux direction of the transformer may be directed toward the starting point of the deflection of the deflection yoke. Can be prevented. According to claim 3,
By placing the transformer of the communication circuit just under the deflection yoke, the generation of communication noise can be prevented.

[Brief description of drawings]

FIG. 1 is a front view showing an example of an internal structure of a monitor television unit according to the present invention.

FIG. 2 is a diagram showing another example of the internal structure of the monitor television unit according to the present invention.

FIG. 3 is an exploded perspective view showing an example of a monitor television unit according to the present invention.

FIG. 4 is a front view showing an example of the internal structure of a conventional monitor TV unit.

FIG. 5 is a diagram showing another example of the internal structure of a conventional monitor television unit.

[Explanation of symbols]

 U ... Monitor TV unit 1 ... Monitor TV 1a ... Deflection yoke T, T '... Transformer (transformer) P ... Deflection starting point K, K1, K2 ... Circuit board 10. ..Inner case 11 ... Base 12 ... Cover 12a ... Display window

Claims (3)

[Claims] 1. A monitor TV having a structure in which an inner case containing a monitor TV is housed in a base provided with a transformer for a communication circuit, and a cover having a display window is covered from above the base to be integrated. The transformer is a unit, and when the inner case is housed in the base,
A monitor TV unit, wherein the magnetic flux direction generated from the transformer is arranged so as to be orthogonal to the magnetic flux direction generated from the deflection yoke of the monitor TV. 2. The transformer according to claim 1, wherein when the inner case is housed in the base,
A monitor TV unit in which the direction of magnetic flux generated from the transformer is arranged so as to be directed to a starting point of deflection of the deflection yoke of the monitor TV. 3. The transformer according to claim 1, wherein when the inner case is housed in the base,
A monitor TV unit, which is arranged directly below a deflection yoke of the monitor TV.