JPH11312565A - Circuit board device and image display device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To freely use a space around the rear of a cathode-ray tube by locating the circuit board of a circuit board device in front of the rear of the neck part of the cathode-ray tube, the circuit board device which is attached to the neck part of the cathode-ray tube via a socket. SOLUTION: This board device 1 includes a circuit board 2, which is provided with a circuit for driving a cathode-ray tube for image display, and a socket 5 mounted on the circuit board 2 and connected to a terminal arranged at the neck part 7 of the cathode-ray tube. The part of the socket 5 mounted on the circuit board 2 is formed in front of a terminal forming part 11 connected to the terminal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit board device for driving a cathode ray tube and an image display device using the circuit board device, and more particularly, to a device for driving an electron gun of a cathode ray tube for image display. The present invention relates to a mounting structure of a circuit board device and an image display device using the circuit board device.

[0002]

2. Description of the Related Art An image display apparatus using a cathode ray tube (hereinafter, referred to as a CRT) for displaying an image of a television broadcast, a computer, or the like, emits an electron beam generated by the discharge of an electron gun.
Since a desired image is displayed by irradiating the inside of the display surface of the RT, a driving circuit for discharging an input image signal from the electron gun is required.

Since the signal output from the driving circuit to the electron gun has a high frequency and a high voltage, if the line length between the output of the driving circuit and the electron gun becomes long, signal attenuation or radiation occurs. Image quality.

FIG. 4 is a perspective view of a CRT 3 to which a conventional circuit board device 31 for driving a cathode ray tube is attached. The circuit board device 31 has a socket 33 attached to a circuit board 32 and is connected to a terminal (not shown) of an electron gun via the socket 33. Therefore, the line length between the output terminal of the drive circuit and the terminal of the electron gun can be shortened, and deterioration of image quality can be prevented.

FIG. 5 is a side view of the CRT 3 shown in FIG. As is well known, the external shape of the CRT 3 narrows like a funnel from a substantially rectangular display surface toward a substantially cylindrical neck portion 7. An electron gun (not shown) is arranged in the neck portion 7, and a deflection coil 21 for controlling the direction of an electron beam from the electron gun is arranged in a portion where the neck portion 7 extends toward the display surface. ing.

FIG. 6 is a side sectional view of the image display device 35 incorporating the CRT 3 shown in FIG. 4 (CRT 3 is not shown in section). The depth of the image display device 35 is a CRT.
Although it depends on the size of the cabinet 3, the cabinet of the image display device 35 may be designed, for example, to narrow down the upper surface 37 of the cabinet as shown in the figure in order to make the cabinet smaller or smaller.

In some cases, the left and right side surfaces of the cabinet are narrowed down toward the rear, and a design is provided to make the appearance look clearer. When the left and right sides of the cabinet are narrowed, for example, when the image display device 35 is installed at the corner of the room, there is an advantage that the rear of the cabinet can be brought closer to the corner of the room and the room can be used widely.

[0008]

In the conventional circuit board device, when the socket on the circuit board is connected to the electron gun, the circuit board device is located behind the neck of the CRT. Therefore, it is necessary to secure a space for the circuit board device behind the cabinet of the display device accommodating the circuit board device and the CRT, and the design of the rear portion of the cabinet is restricted.

[0009]

A circuit board device according to the present invention comprises a circuit board provided with a circuit for driving a cathode ray tube for image display, and a neck of the cathode ray tube attached to the circuit board. And a socket connected to a terminal provided in the portion. The socket has a portion attached to the circuit board formed in front of a front surface of a terminal forming portion connected to the terminal.

The circuit board may be provided with a through hole, and the neck portion may be inserted into the through hole when connecting the socket to the terminal.

Further, the socket is formed in a cylindrical shape having one closed and the other opened, and the cylindrical opening is aligned with the through hole and attached to the circuit board. It is preferable that the terminal forming portion is provided in the portion where the terminal is formed.

Also, as an image display device, a cathode ray tube for displaying an image, a circuit board provided with a circuit for driving the cathode ray tube, and a circuit board mounted on the circuit board,
A circuit board device having a socket connected to a terminal provided on a neck portion of the cathode ray tube, wherein the socket has a portion formed on the circuit board and a terminal forming portion connected to the terminal. The front is formed.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a circuit board device for driving a cathode ray tube according to the present invention and an image display device using the circuit board device will be described with reference to the drawings.

FIG. 1 is a perspective view of a cathode ray tube 3 (hereinafter referred to as a CRT) to which a circuit board device 1 according to the present invention is attached. The socket 5 attached to the circuit board 2 of the circuit board device 1 is formed in a cup shape with one closed and the other opened, the opening 13 is attached to the circuit board 2, and the bottom inner surface 11 has A terminal forming portion (not shown) is provided which is connected to a terminal (not shown) of the electron gun provided at the rear end of the neck portion 7. Therefore, when the socket 5 is attached to the neck 7, the circuit board 2 is located on the display surface side of the neck 7.

FIG. 2 is a side view of the CRT 3 shown in FIG. The circuit board 2 is formed with a through hole 15 through which the neck 7 is inserted, and the opening 13 of the socket 5 is attached to the through hole 15 so as to be aligned.

As shown in FIGS. 1 and 2, the circuit board 2 attached to the CRT 3 via the socket 5 is a CR board.
Since it is located in front of the neck part 7 of T3, the space around the rear end of the neck part 7 can be used freely.

The socket 5 to be put on the neck 7
Accordingly, the weight of the circuit board device 1 is distributed between the terminal and the outer surface of the neck portion 7, so that the load applied to the connection portion with the terminal is reduced, and poor contact and damage to the contact can be prevented. Also,
Since the rattling of the circuit board device 1 is reduced, a means (not shown) for holding the circuit board device 1 can be simplified or omitted. Moreover, since the neck portion 7 is inserted into the through hole 15 of the circuit board 2, the circuit board device 1 does not fall off.

FIG. 3 shows the circuit board device 1 shown in FIG.
Side sectional view (C) of the image display device 17 incorporating the RT3.
RT is not a cross section). Since the circuit board 2 is located forward of the rear end of the CRT 3, when narrowing the upper surface 19 of the cabinet backward as shown in the figure, the circuit board 2
Is not in the way, and the upper surface 19 and the like of the cabinet can be greatly narrowed. The same applies to the left and right side surfaces of the cabinet, although not shown.

The design in which the upper surface 19 of the cabinet or the like is greatly narrowed backward has a design effect that the appearance of the image display device 17 can be substantially or apparently reduced in size. Further, since the volume of the upper space of the CRT 3 is reduced, the heat generated during the operation of the CRT 3 is quickly released to the outside of the cabinet from a heat release slit (not shown) or the like on the cabinet upper surface 19, so that the inside of the cabinet is removed. This has a practical effect that heat is not stored and an internal temperature rise can be suppressed.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, but can take various embodiments.

For example, since the circuit board 2 approaches the deflection coil 21 disposed in front of the neck portion 7, a circuit for controlling the deflection coil 21 is provided on the circuit board 2 together with the above-described drive circuit. May be. In this case, two types of circuits may be allocated to each side using a circuit board on both sides, or the circuit boards for each circuit may be stacked via a spacer or the like.

When no through hole is provided in the circuit board,
The socket does not need to be cup-shaped as in the embodiment,
For example, the whole may be L-shaped.

[0023]

According to the present invention, the circuit board of the circuit board device mounted on the neck of the cathode ray tube via the socket is located forward of the rear of the neck of the cathode ray tube. Space is freely available.

Further, since the neck portion is inserted into the through hole of the circuit board, the circuit board device can be reliably prevented from falling off.

Further, since the socket is attached so as to surround the neck of the cathode ray tube, the weight of the circuit board device is also applied to the outer surface of the neck of the cathode ray tube, so that the load applied to the terminal to which the socket is connected is reduced. Is reduced, and poor contact between the socket and the terminal and damage to the terminal can be prevented.

Further, since the image display device using this circuit board device can freely use the space around the rear portion of the cathode ray tube, the image display device is designed to be greatly narrowed at the rear portion of the cabinet to reduce the size of the image display device. Can be planned.

[Brief description of the drawings]

FIG. 1 is a perspective view of a cathode ray tube to which a circuit board device according to the present invention is attached.

FIG. 2 is a side view of the cathode ray tube shown in FIG.

FIG. 3 is a side sectional view of an image display device incorporating the circuit board device and the cathode ray tube shown in FIG.

FIG. 4 is a perspective view of a cathode ray tube to which a conventional circuit board device is attached.

FIG. 5 is a side view of the cathode ray tube shown in FIG.

6 is a side sectional view of an image display device incorporating the circuit board device and the cathode ray tube shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circuit board apparatus 2 Circuit board 3 Cathode ray tube (CRT) 5 Socket 7 Neck part 11 Inner surface (terminal formation part) 15 Through hole

Claims (4)

[Claims] 1. A circuit board on which a circuit for driving a cathode ray tube for image display is provided, and a socket attached to the circuit board and connected to a terminal disposed on a neck portion of the cathode ray tube. A circuit board device comprising: a socket, wherein a portion attached to the circuit board is formed in front of a terminal forming portion connected to the terminal. 2. The circuit board according to claim 1, wherein a through hole is formed in the circuit board, and the neck portion is inserted into the through hole when the socket is connected to the terminal. Circuit board device. 3. The socket is formed in a tubular shape, one of which is closed and the other is open, and the tubular opening is aligned with the through hole and attached to the circuit board, and the socket is closed. 3. The circuit board for driving a cathode ray tube according to claim 2, wherein the terminal forming portion is provided at a portion where the terminal is formed. 4. A cathode ray tube for displaying an image, a circuit board provided with a circuit for driving the cathode ray tube, and a terminal mounted on the circuit board and arranged on a neck portion of the cathode ray tube And a circuit board device having a socket connected to the circuit board, wherein the socket has a portion attached to the circuit board formed in front of a terminal forming portion connected to the terminal. Image display device.