JPH11239341A - Electric equipment incorporated with reflection crt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric equipment incorporated with reflection CRT capable of being easily manufactured at a low cost and making the equipment main body thin in thickness and small in size while preventing the magnetic flux of a power transformer from affecting the reflection CRT. SOLUTION: In this electric equipment in corporated with a reflection CRT 1 into the equipment main body together with a power transformer Tr, the entire rear side of the reflection CRT is enclosed by a rear side cover 2 made of a light shield material and a magnetic material S is provided at a part of the rear side cover 2 which encloses a deflection yoke 1b of the reflection CRT.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric device having a built-in reflection type CRT, and more particularly to an electric device having a built-in reflection type CRT which can be easily manufactured at low cost and prevents the influence of magnetic flux of a power transformer from affecting the reflection type CRT. The present invention relates to an electric device having a built-in reflection-type CRT capable of reducing the thickness and size of the device.

[0002]

2. Description of the Related Art In recent years, in order to develop and distribute an electric device incorporating a reflection type CRT, for example, a television intercom master unit and a sub master unit, to the market, it is desired to make the device body thinner and smaller. Rare, for that, reflective CR
It is necessary to densely store the T and a circuit unit such as a power supply unit in a narrow device body.

[0003] Therefore, there is no other way to effectively utilize the inside of the narrow equipment body except to arrange the deflection yoke of the reflection type CRT and the power transformer close to each other. In such a case, the deflection yoke is moved from the power transformer. , And the image on the display screen of the reflection type CRT is often disturbed. In Japanese Unexamined Patent Publication No. 9-149406 proposed to solve this problem, as shown in FIG. 4, the deflection yoke 101b is affected by the magnetic flux from the power transformer Tr by the heat sink 108, so that the reflection type CRT 101 is not affected.
A configuration for preventing the image on the display screen from being disturbed is disclosed.

In FIG. 4, reference numeral 102 denotes a back cover made of a light-shielding material, which is provided so as to wrap the entire back surface of the display screen 101a of the reflection type CRT 101. It does not leak inside the body. The rear cover 102 is arranged so as to be supported by the ribs 103 together with the reflective CRT 101.

In the drawing, reference numeral 104 denotes a base, 1
Reference numeral 05 denotes a power supply unit including a power transformer Tr and a smoothing capacitor 106, 107 denotes a circuit board, L1 denotes an image signal line derived from the face unit 101A for transmitting a video signal to the reflective CRT 101, and L2 denotes a deflection yoke. 10
This is a power supply line for applying a voltage to 1b.

[0006]

The above conventional reflection type CR
In an electric device having a built-in T, there is an advantage that the influence of the magnetic flux generated from the power transformer on the deflection yoke can be cut off only by installing a heat sink so as to cover the power transformer. However, since the heat radiating plate is made of a metallic material such as iron having an L-shaped cross section, it takes time and cost in the manufacturing process, and furthermore, it costs more to manufacture the electric equipment. Cost reduction is desired.

In addition, since the space occupied by the heat radiating plate must be ensured in the device main body, there is a problem that it is harmful to make the device main body thinner and smaller. Furthermore, there is a problem that it is difficult to arrange the video signal lines and the power supply lines. The present invention has been proposed in view of the above circumstances, and can be manufactured easily at low cost, and can reduce the thickness and size of a device main body while preventing the influence of magnetic flux of a power transformer from affecting a reflection type CRT. It is an object of the present invention to provide an electric device having a built-in reflective CRT.

[0008]

In order to achieve the above object, in an electric device having a built-in reflective CRT according to the present invention, the entire back surface of the reflective CRT is made of a back cover made of a light-shielding material. Wrapped in, the back cover is a reflective CRT
The structure enclosing the deflection yoke is provided with a magnetic material.

Here, since the back cover has a structure enclosing the entire back surface of the reflection type CRT, the entire reflection type CRT can be protected. In addition, since the portion surrounding the deflection yoke is provided with a magnetic material,
The effect of the magnetic flux generated from the power transformer provided in the power supply unit can be cut off. According to another aspect of the present invention, the back cover has a cutout window for projecting wiring derived from the reflective CRT.

Here, the cutout window has a structure in which a power supply line derived from the neck portion and a video signal line derived from the face portion can be collectively lined, thereby improving workability during manufacturing. I have. According to the third aspect of the present invention, the light shielding material is a heat resistant resin.

Here, as the heat resistant resin, heat resistant vinyl chloride, ABS resin and the like can be applied. In the electric device incorporating the reflection type CRT according to claim 4, the magnetic material is:
It is a mesh plate of a silicon steel plate. According to a fifth aspect of the present invention, there is provided an electric device having a built-in reflection type CRT, wherein the electric device according to any one of the first to fourth aspects is a television intercom.

Here, as the TV intercom, all electric devices having a built-in reflection type CRT and having an intercom communication function, such as a TV intercom master unit and a sub master unit, are applicable.

[0013]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a reflection type CR according to the present invention.
FIG. 2 is an exploded perspective view of a main part showing an example of an internal structure of an electric device incorporating a T. FIG. 2 is a perspective view of a main portion showing an example of an internal structure of an electric device incorporating a reflective CRT of the present invention.

In this example, a television interphone will be described as an example of an electric device incorporating a reflection type CRT.
The present invention is not limited to this, and can be applied to all electric devices incorporating a reflection type CRT. As shown in FIG.
Is a rear cover having a cutout window 2A, and a reflective CR
It is mounted on the base 4 along the direction of the arrow along with T1 and is supported by the ribs 3. Back cover 2
Is made of a light-shielding material so as to prevent light from the display screen section 1a of the reflection type CRT 1 from leaking in the apparatus main body.

The back cover 2 covers the entire back surface of the reflective CRT 1, that is, the portion surrounding the deflection yoke 1 b of the reflective CRT 1 so as to cover not only the face portion 1 A but also the neck portion 1 B. A magnetic material S having a magnetic shielding effect, such as a mesh plate, is attached. Further, as the light-shielding material of the back cover 2, a heat-resistant resin such as heat-resistant vinyl chloride or ABS resin is used to prevent the rear cover 2 from being deformed by the heat generated from the reflective CRT 1. .

In the figure, reference numeral 4 denotes a base, 5 a power supply unit composed of a power transformer Tr, a smoothing capacitor 6, etc., 7 a circuit board, L1 led out of the face unit 1A, and a video signal to the reflection type CRT1. L2 is a power supply line for applying a voltage to the deflection yoke 1b. By adopting such a structure, as shown in FIG. 2, when incorporated in a television intercom, the reflection type CRT 1 is provided with a rib 3 inside the device main body with its entire back surface wrapped by the back cover 2. The video signal line L of the reflection type CRT 1 is
1 and the power supply line L2 led out of the deflection yoke 1b of the reflection type CRT 1 are brought into a neatly aligned state by being pushed together into the notch window 2A.

The magnetic material S cuts off magnetic flux from the power transformer Tr, and the deflection yoke 1b
r prevents the image on the display screen 1a from being disturbed by the influence of the magnetic flux. Thus, the back cover 2
Since the entire rear surface of the reflection-type CRT 1 is wrapped around, the entire reflection-type CRT can be protected by only one rear cover, and the wiring can be arranged and arranged collectively by the cutout window 2A.

Further, the magnetic material S can prevent the influence of the magnetic flux from the power transformer Tr from affecting the deflection yoke 1b. Further, since the magnetic material S is formed by processing a mesh plate such as a silicon steel plate, the production of the magnetic material can be performed at low cost and easily. Next, a specific use example of the present invention will be described with reference to FIG.

FIG. 3 shows a television intercom system as one specific example of the use of the present invention.
TV intercom master units A and A 'installed indoors,
The TV intercom slave set B installed at the entrance is
The configuration is such that they are connected by a linear signal line L. FIG.
(A) shows a system including a hands-free type TV intercom master unit A. In this master unit A, when the call button b of the slave unit B is operated, a child is If the power of the camera 10 on the device B side is turned on, an external image is displayed on the display screen section 1a, and the call button b1 is operated, thereafter, a call can be made only by talking to the microphone M. In the drawing, reference numeral 8 denotes a call lamp indicating that a call is being made by lighting or the like;
A monitor button b2 is operated to monitor the video and audio on the slave B side.

On the other hand, FIG. 1 (b) shows a system including a home information panel A 'with an intercom function as an example of a television intercom master unit of a type having a handset H. In the house information panel A ', a fire sensor is used to monitor the fire in the room, and when the call button b of the slave unit B is operated, the power of the camera 10 is turned on, and the surroundings of the slave unit B are displayed on the display screen 1a. In addition to displaying an image, a chime sound is emitted from the speaker SP, and in response to this call, when the handset H is lifted, a call can be made with the handset B side.

Although the television intercom master unit is shown here as the television interphone, the present invention is not limited to this, and a television interphone sub master unit may be used.

[0022]

As can be understood from the above description, in the electric equipment incorporating the reflection type CRT according to the first aspect, the entire back surface of the reflection type CRT is wrapped with the back cover made of a light shielding material. Therefore, the entire rear surface of the reflection type CRT can be protected by one back cover, and light from the display screen of the reflection type CRT can be prevented from leaking in the apparatus main body.

Further, since the rear cover is provided with a magnetic material in a portion surrounding the deflection yoke of the reflection type CRT, the image on the display screen is affected by the magnetic flux generated from the power supply transformer. Disturbance can be prevented. In the electric device having a built-in reflective CRT according to claim 2, the back cover is formed with a cutout window through which a wiring derived from the reflective CRT is formed. The video signal lines derived from the section can be collectively arranged.

In the electric device having the reflection type CRT according to the third aspect, the light-shielding material is a heat-resistant resin.
The rear cover can be prevented from being deformed by the influence of heat generated from the reflection type CRT. The reflective CR according to claim 4.
In an electric device having a built-in T, the magnetic material is a mesh plate of a silicon steel plate, so that the magnetic material can be easily manufactured at low cost.

In the electric equipment incorporating the reflection type CRT according to the fifth aspect, since the electric equipment according to any one of the first to fourth aspects is a television interphone, a television interphone base exhibiting the effects of the present invention is provided. TV intercom such as a machine can be provided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part showing an example of an internal structure of an electric device incorporating a reflection type CRT of the present invention.

FIG. 2 is a perspective view of a main part showing an example of an internal structure of an electric device incorporating a reflection type CRT of the present invention.

FIG. 3 is a system configuration diagram showing a specific example of use of an electric device incorporating a reflective CRT according to the present invention.

FIG. 4 is an exploded perspective view of an essential part showing an example of the internal structure of a conventional electric device incorporating a reflection type CRT.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Reflection type CRT 1b ... Deflection yoke 2 ... Rear cover 2A ... Notch window L1 ... Image signal line L2 ... Power supply line S ... Magnetic material Tr ... Power supply transformer A, A ': TV intercom master unit B: TV intercom slave unit

Claims (5)

[Claims] 1. An electric device in which a reflection type CRT is built in a main body of a device together with a power transformer, wherein the entire rear surface of the reflection type CRT is wrapped with a back cover made of a light-shielding material. CR
An electric device incorporating a reflection type CRT having a structure in which a magnetic material is provided in a portion surrounding the deflection yoke of T. 2. The reflection type C according to claim 1, wherein the back cover is formed with a cutout window for projecting a wiring derived from the reflection type CRT.
Electrical equipment with a built-in RT. 3. The electric device according to claim 1, wherein the light-shielding material is a heat-resistant resin. 4. The electric device according to claim 1, wherein the magnetic material is a mesh plate of a silicon steel plate. 5. An electric device having a built-in reflection type CRT, wherein the electric device according to claim 1 is a television intercom.