JPH0228600Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a novel portable television receiver. In detail, it is suitable for use in small portable television receivers, and is suitable for use in cathode ray tubes.
Does not take up much space around the CRT socket,
The object of the present invention is to provide a new portable television receiver that can absorb the dimensional tolerance of cathode ray tubes and is resistant to shocks.

BACKGROUND ART AND PROBLEMS Several methods have been used in the past to connect a CRT socket to a circuit board containing an electron gun control circuit in a portable television receiver. A conventional example thereof is shown in FIG.

In the method shown in FIG. 1A, a is a cathode ray tube tube, from which an electron gun is enclosed and connection pins b, b, . . . are made to protrude from the rear end. C is an exhaust pipe that protrudes from the center of the rear end of tube a, and is tipped off after exhausting the inside of the cathode ray tube. d is
It is a CRT socket, and the connecting pins e, e, ... protruding from the rear end are inserted into holes g, g, ... formed in the network board f, and the connecting pins e, e, ...
The protruding ends of the holes g, g, . . . are soldered to one ends of the wiring films h, h, . . . formed on the network board f. One end of the lead wires i, i, . . . is connected to the other end of the wiring films h, h, . . . on the network substrate f. And this lead wire i,
The other ends of i, . . . are connected to a parent board (not shown).
By pushing the connecting pins b, b, ... protruding from the rear end of the tube a of the cathode ray tube into the CRT socket d, a connection is made between the electron gun of the cathode ray tube and the control circuit on the main board. will be done.

In the method shown in FIG. 1B, the CRT socket d is directly connected to the parent board by leads i, i, . . . .

In addition, in the method shown in Figure 1C, the CRT
A network board f holding a socket d is connected to a parent board by a flat cable j.

However, all three methods described above have drawbacks.

That is, according to the method shown in FIG. 1A and B,
Because the lead wires i, i, ... are used, it is necessary to leave some space for bending the lead wires, which takes up a surprising amount of space, and also because the multiple lead wires i, i, ... are separated. They do not fit well, and if they are bundled, flexibility is lost, so a large margin is required at the bending point, which impedes miniaturization. In addition, when connecting the lead wire to a circuit board, the tip l protrudes from the solder mound k as shown in Figure 2, so if it remains as it is, it will take up space in the thickness direction of the circuit board. If there is not enough space, the end l must be cut off each time, resulting in poor workability. Furthermore, the use of lead wires i, i, . . . itself is inefficient.

In addition, in the case shown in Fig. 1A and C, a CRT socket d is attached to a network board f which has almost no shock absorption properties.
is fixed, so the shock is absorbed by the cathode ray tube.
There is a drawback that the signal is transmitted directly to the connection part with the CRT socket d. In addition, the network board f itself takes up an extremely large amount of space, which is a factor that hinders miniaturization of the device.

As explained above, the connection method between the CRT socket and the circuit board in conventional portable television receivers takes up installation space and work space, hinders miniaturization, and has problems such as poor impact resistance. There were flaws.

Purpose of the invention The present invention was devised in view of the above-mentioned problems with conventional portable television receivers.
The object of the present invention is to provide a new portable television receiver that does not take up much space around the CRT socket of the cathode ray tube, can absorb the dimensional tolerance of the cathode ray tube, and is resistant to shocks.

Summary of the invention In order to achieve the above purpose, the portable television receiver of this invention has a
A portable television receiver connected via a CRT socket is characterized in that the CRT socket and the circuit board are connected by a flexible printed circuit board.

Therefore, according to the portable television receiver of the present invention as described above, the circuit board is arranged approximately parallel to the tube section of the cathode ray tube, and the circuit board and CRT socket are arranged in a substantially L-shape separate from the circuit board. They are electrically connected to each other by a flexible printed circuit board, and the flexible printed circuit board has one L-shaped arm bent at the base of the CRT socket connection part, and the other L-shaped arm bent gently. The flexible printed circuit board is bent approximately 90 degrees to extend into the circuit board and surround the CRT socket, so if the approximately L-shaped flexible printed circuit board is unfolded, the flexible printed circuit can be opened. You can secure enough space to connect the circuit board to the circuit board and connect the flexible printed circuit board to the CRT socket, improving work efficiency. When the flexible printed circuit board is bent, the installation space becomes extremely small, which contributes to miniaturization of portable television receivers. Furthermore, since the flexible printed circuit board has high shock absorbing properties, it has the effect of alleviating the transmission of shock to the cathode ray tube, and further has the effect of absorbing the dimensional tolerance of the cathode ray tube.

Embodiments The details of the portable television receiver of the present invention will be described below with reference to illustrated embodiments.

1 is a front casing, and 2 is a rear casing, both of which are made of synthetic resin, and a casing 3 is formed by integrating the two. Reference numeral 4 denotes a window formed in the upper part of the front housing 1, through which the image plane of the cathode ray tube 5 can be seen. Further, a shallow recess 6 is formed in a region including the window 4 at the upper front surface of the front housing 1 . Reference numeral 7 denotes a screen frame made of aluminum, which is fitted into the recess 6 of the front housing 1. Also, in this screen frame 7, a window 8 corresponding to the window 4 of the front housing 1 is provided.
is formed. Reference numeral 9 denotes a filter plate made of a transparent material, for example, a transparent synthetic resin, which is superimposed on the front side of the screen frame 7 and is attached to the front housing 1.
The front housing 1 is fitted into the recess 6 and fixed to the front housing 1 with screws 10 or the like.

The cathode ray tube 5 and other necessary parts are housed and held in the casing 3.

The flat cathode ray tube 5 includes a tube 12, an image reproduction section 13, and a funnel section 14. The tube 12 is made of glass and has a cylindrical shape, and an electron gun (not shown) is sealed therein from the bottom end. 15, 15, ... are connecting pins protruding from the lower end of the tube 12, and 16 is an exhaust pipe.The funnel part 14 is also made of glass, and has a fan shape with a small opening at the bottom and a large opening at the top. ,
The upper end of the tube 12 is welded to the lower end opening, so that the tube 12 and the funnel portion 14 are integrated. The image reproduction section 13 is composed of a screen panel 17 made of glass and a front panel 18 made of glass as well.The screen panel 17 has a fluorescent surface formed on its inner surface, and a conductive coating 19 on its back surface. is formed. The conductive coating 19 is formed, for example, by pasting a carbon sheet, but may be formed by other appropriate means.

The screen panel 17 and the front panel 18 are bonded and integrated to form an image playback section 13, and the lower open end of the image playback section 13 is butted against the upper end opening of the funnel section 14 to be bonded and integrated. The cathode ray tube 5 is constructed by this. In this cathode ray tube 5, the back surface (and therefore the inner surface) of the screen panel 17 has a forward tilted position such that the upper end is slightly displaced forward. Therefore, when this cathode ray tube 5 is viewed from the right side, The back surface of the screen panel 17 and the back surface of the funnel portion 14 are continuous in a substantially inverted dogleg shape. Further, the front surface of the front panel 18 is a plane parallel to the axis of the tube 12.

Note that 20 is a deflection yoke arranged so as to surround the upper end of the tube 12 and the lower end of the funnel section 14.

Reference numeral 21 denotes a cathode ray tube holder, which is composed of a conductive U-shaped holding fitting 22 and similarly conductive dogleg-shaped pressing springs 23, 23. The joint portion of the image reproduction section 13 and funnel section 14 of the cathode ray tube 5 is positioned within the holding fitting 22, and the holding fitting 22 is fixed to the front housing 1 in this state. Then, the back of the image reproduction section 13 of the cathode ray tube 5 is pressed by a pusher 2.
It is elastically pressed by both tips of 3 and 23.

In this way, the cathode ray tube 5 is held in the front housing 1 by the cathode ray tube holder 21.

Reference numeral 24 denotes a printed circuit board disposed substantially parallel to the tube 12 of the cathode ray tube 5 at the lower left side when viewed from the front of the housing 3, and a flyback transformer 25.
is arranged on this printed circuit board 24.
CRT socket 26 is connected.

The CRT socket 26 has an exhaust pipe 1 protruding from the lower end of the tube 12 of the cathode ray tube 5 at its center.
An insertion hole 27 is formed for receiving the connecting pin 15 , which is arranged around the exhaust pipe 16 of the tube 12 .
Insertion holes 28, 28, . . . for receiving . . . are formed. Terminals (not shown) are arranged in these insertion holes 28, 28, . . . to be brought into contact with the connecting pins 15, 15, .
Connection ends 29, 29, . . . of these terminals project from the lower end of the CRT socket 26.

Reference numeral 30 denotes a flexible printed circuit board that connects the CRT socket connection ends 31, 31 formed on the printed circuit board 24 and the CRT socket 26. This flexible printed circuit board 30 has connection ends 29, 29, .
A wiring film (not shown) is formed to connect the CRT socket connection ends 31, 31, and is covered with a flexible overlay film 33 having similar insulating properties. That is, the wiring film is formed between the base film 32 and the overlay film 33 in a sandwich-like structure. One end of the L-shape is a substantially circular CRT socket connection part 34, and the CRT socket 26 is inserted into the insertion hole 2 in the center of the CRT socket connection part 34.
A center hole 35 corresponding to the CRT socket 26 is formed around the center hole 35, and an insertion hole 3 is formed around the center hole 35 through which the connection ends 29, 29, . . . protruding from the CRT socket 26 are inserted.
6, 36,... are formed, and this insertion hole 3
At portions 6, 36, . . . , the surrounding overlay film 33 is slightly removed to expose connection ends 37, 37, . Connection portions 38, 38 are formed from the other end of the L-shape to the printed circuit board 24, and connection ends 39, 39 of the wiring film to the printed circuit board 24 are exposed at the tips of the connection portions 38, 38. I'm being forced to do it. Therefore, the wiring film on the flexible printed circuit board 30 is connected to the connection end 3.
Only portions 7, 37, . . . and 39, 39 are exposed to the outside, and the other portions are completely covered by the base film 32 and overlay film 33.

Flexible printed circuit board 3 as above
The connection of the CRT socket 26 to the CRT socket connection section 34 of 0 is made as follows. That is,
With the approximately L-shaped flexible printed circuit board in an unfolded state, insert the connecting ends 37, 36, 36, .
Connection ends 29, 2 protrude from the lower end of the CRT socket 26 from the side opposite to the side where 37,... are exposed.
9,... are inserted, and the connection ends 39, 29, ... of the CRT socket 26 are connected and fixed to the connection ends 37, 37, ... of the flexible printed circuit board 30 by soldering. A CRT socket 26 is connected to one end of the flexible printed circuit board 30.

Further, the connecting ends 39, 39 exposed at the tips of the connecting ends 38, 38 provided at the other end of the flexible printed circuit board 30 are soldered to the CRT socket connecting ends 31, 31 on the printed circuit board 24. Connected. These allow the CRT to be connected via the flexible printed circuit board 30.
Socket 26 and printed circuit board 24 are connected.

Further, the connecting pins 15, 15, . . . protruding from the tube 12 of the cathode ray tube 5 are inserted into the insertion holes 28, 28, . , are connected via a flexible printed circuit board 30 to a printed circuit board 24 on which a flyback transformer 25 is mounted.

In this manner, since various connection operations are performed with the approximately L-shaped flexible printed circuit board 30 unfolded, a sufficient space for the operations can be secured, resulting in good work efficiency.

At this time, the exhaust pipe 16 protruding from the tube 12 is inserted into the insertion hole 27 of the CRT socket 26 and the insertion hole 36 of the flexible printed circuit board 30, and the connecting pins 15 are inserted into the insertion hole 2.
8, 28, etc. so that it does not get in the way when inserted.

FIG. 6 shows the state in which the flexible printed circuit board 30 is mounted inside the housing 3. As shown in this figure, the flexible printed circuit board 30 has an L-shaped arm 40 at one end.
The other L-shaped arm 41 is bent at the base of the socket connection part 34 and is gently bent approximately 90 degrees so as to extend toward the printed circuit board 24 and surround the CRT socket 26. Therefore, an extremely small installation space is sufficient. Furthermore, since the flexible printed circuit board 30 is extremely flexible, the impact transmitted to the printed circuit board 24 is not transmitted to the cathode ray tube 5, and
Dimensional tolerances caused by welding the tube 12 and funnel portion 14 can be sufficiently absorbed. Further, since the wiring film is covered with a base film 32 and an overlay film 33, there is no fear of shortening no matter how the wiring film is bent.
Incidentally, the same advantage can be obtained even if an insulating coating is applied instead of the overlay film 33.

42 is another printed circuit board on which a tube unit 43 is arranged, and various circuits necessary for the television receiver are formed thereon, although not shown. This printed circuit board 42 is connected to the holding fitting 22 of the cathode ray tube holder 21 by screws 44. And this screw 4
4 is made of a conductive material, and its head 45
is in contact with a ground pattern 46 formed on the printed circuit board 42. Therefore, the cathode ray tube 5
The conductive coating 19 formed on the back surface of the image reproduction unit 13 and the ground pattern 46 on the printed circuit board 42 are connected to the presser springs 23, 23 and the holding fitting 2.
2 - Will be connected via screw 44. Further, the fastening of the screw 44 to the holding fitting 22 also serves to hold the printed circuit board 42.

Reference numeral 47 denotes yet another printed circuit board, which is disposed in the upper right half of the housing 3 when viewed from the front, and in front of the printed circuit board 42. Reference numeral 48 denotes an antenna holding member disposed in contact with the lower end of the printed circuit board 47, and a circular recess 4 formed on the upper surface thereof.
The proximal end of the rod antenna 50 is fitted into the portion 49, and a screw 51 is fastened thereto from below the holding member 48, thereby fixing the rod antenna 50 to the antenna holding member 48. Further, the upper end of the lowermost part of the rod antenna 50 is fitted into and held by an antenna holding ring 52 that protrudes rearward from a slightly inner side of the upper end wall of the front housing 1.

Reference numeral 53 denotes a battery holder, which is detachably housed in a battery housing recess 56 through an opening 55 formed in the rear housing 2 so that it can be opened and closed by a lid 54 while holding the battery.

57 is a speaker, and 58 is an earphone jack, which is held in the lower left corner of the housing 1 via a holding member 59 when viewed from the front.

Reference numeral 60 denotes a stand for keeping the casing 3 in a slightly slanted position on a desk or other stand to make it easier to view the screen. Engagement pieces 62, 62 are formed to protrude and engage with the formed holes 61, 61.
This stand 60 has its engaging pieces 62, 6
2 is passed through the holes 61, 61 of the rear housing 2, so that it is rotatably supported by the rear housing 2 at the upper ends of both sides. Therefore, the stand 60 supports the casing 3 by rotating around the supported part and opening the space between the casing 3 and the casing 3.
It is possible to make it stand out. stand 6
0 is kept in close contact with the rear surface of the rear housing 2 when not in use. Reference numeral 63 indicates an engagement protrusion formed on the lower front surface of the stand 60; 64 indicates an engagement hole provided in the rear housing 2 corresponding to the engagement protrusion 63;
0 is brought into close contact with the outer surface of the rear housing 2, the engagement protrusion 63 is engaged with the engagement hole 64.

Note that a portable television receiver requires various parts in addition to those shown above.
Illustrations and explanations have been omitted.

Effects of the Invention As is clear from the above description, the portable television receiver of the present invention is a portable television receiver in which a cathode ray tube and a circuit board are connected via a CRT socket. The circuit board and the CRT socket are arranged approximately parallel to the tube section of the cathode ray tube, and the circuit board and the CRT socket are electrically connected to each other by a roughly L-shaped flexible printed circuit board that is separate from the circuit board. The printed circuit board is arranged such that one end arm of the L-shape is bent at the base of the CRT socket connection part, and the other arm of the L-shape is gently bent approximately 90 degrees to extend to the circuit board. It is characterized by being arranged to surround the CRT socket.

Therefore, according to the portable television receiver of the present invention, if the approximately L-shaped flexible printed circuit board is kept in an unfolded state, connection work between the flexible printed circuit boards and the circuit boards can be easily performed. You can secure enough space for the connection work with the CRT socket, improving work efficiency, and once the connection work is completed, the flexible printed circuit board can be folded to surround the CRT socket, reducing the installation space. This makes it possible to contribute to the miniaturization of portable television receivers. Furthermore, since the flexible printed circuit board has high shock absorbing properties, it has the effect of alleviating the transmission of shock to the cathode ray tube, and further has the effect of absorbing the dimensional tolerance of the cathode ray tube.

[Brief explanation of the drawing]

FIGS. 1A, B, and C are perspective views of essential parts showing different examples of connections between a CRT socket and a circuit board in a conventional portable television receiver;
FIG. 2 is an enlarged sectional view showing the connecting portion between the lead wire and the circuit board, and FIGS. 3 to 6 show an example of the implementation of the portable television receiver of the present invention.
The figure is an exploded perspective view of the entire unit, Figure 4 is a perspective view of the main parts showing the CRT socket and flexible printed circuit board separated, and Figure 5 is a main part showing the state before the CRT socket is attached to the cathode ray tube. FIG. 6 is a perspective view of the main parts showing the CRT socket attached to the cathode ray tube. Explanation of symbols, 5... Braun tube, 12... Tube part, 24... Circuit board, 26... CRT socket, 30... L-shaped flexible printed circuit board, 34, 40... (30) An arm at one end of an L shape.

Claims (1)

[Scope of utility model registration request] In a portable television receiver in which a cathode ray tube and a circuit board are connected via a CRT socket, the circuit board is arranged approximately parallel to the tube portion of the cathode ray tube, and the circuit board and the
The CRT sockets are electrically connected to each other by a roughly L-shaped flexible printed circuit board that is separate from the above-mentioned circuit board, and one arm of the L-shaped end of the flexible printed circuit board is connected to the CRT socket connection part. The CRT is bent at the base of the CRT, and the other L-shaped arm is gently bent approximately 90 degrees to extend toward the circuit board.
A portable television receiver characterized by being arranged so as to surround a socket.