JPH0454676Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultra-small cathode ray tube device used, for example, as a viewfinder for video cameras and television cameras.

[Prior art]

In cathode ray tubes that reproduce images in video equipment, etc., electron beams from an electron gun installed inside the network,
Alternatively, in order to deflect the beam horizontally and vertically, a deflection coil is generally mounted on the outer periphery of the neck portion, and the electron beam is scanned over the fluorescent screen of the face portion. In this case, the spot position on the phosphor screen when the electron beam from the electron gun is not deflected is not necessarily at the center of the phosphor screen, but in order to correct the electron beam spot position to the center of the phosphor screen, A centering magnet (magnetic field generating means) is arranged around the outer periphery of the neck portion. Conventionally, this centering magnet has been installed on the stem side of the deflection coil, and an example of its structure will be explained with reference to FIGS. 2 and 3.

100 is a cathode ray tube; 101 is its network portion 1;
The electron gun 00a is housed, 102 is a fluorescent screen formed on the inner surface of the face portion 100c, and 103 and 105 are a deflection coil and a centering magnet attached to the outer periphery of the neck portion 100a.
The deflection coil 103 is inserted from the neck portion 100a of the cathode ray tube 100 to a part of the funnel portion 100b.A split cylindrical resin holder 104 is attached to the rear end of the deflection coil 103 on the stem portion 100d side. is fixed with adhesive, and this holder 1
Centering magnet 105 on the outer periphery of 04
and a tightening band 106 that tightens the holder 104 to the neck portion 100a. The centering magnet 105 and the deflection coil 103 are installed at predetermined positions with respect to the electron gun 101, and the tightening band 106 is tightened at both ends with a screw 107 and a nut 108 to secure the holder 104 to the neck portion 100a. Tightening, deflection coil 103
is fixed to the neck portion 100a.

By the way, in a cathode ray tube device in which a centering magnet is placed behind the deflection coil,
There are the following problems. For example, in a magnetic field focusing type cathode ray tube device, the magnetic field of the centering magnet causes mutual interference with the magnetic field of the focusing magnet, and it takes time to adjust the two, making accurate adjustment difficult. Further, there is a problem in that the magnetic field of the centering magnet enters the electron gun, equivalently causing the electron gun to become out of alignment.

Therefore, the applicant first applied the following to the outer periphery of the neck part.
Place the centering magnet in front of the deflection coil.
That is, a cathode ray tube device has been proposed which solves the above problem by placing the centering magnet on the face side and sufficiently separating it from the magnetic field focusing magnet and the electron gun. To explain this with reference to FIGS. 4 and 5, 103 and 105 represent the network portion 100.
A cylindrical resin holder 110 that supports the centering magnet 105 is adhesively fixed to the front surface of the deflection coil 103, and a split mold is attached to the rear surface of the deflection coil 103. Cylindrical resin holder 111
is fixed with adhesive. A tightening band 106 is fitted into the latter holder 111, and by tightening both ends of this tightening band 106 with screws 107 and nuts 108, the holder 111 is secured to the neck portion 1.
00a, and the deflection coil 103 and centering magnet 105 are fixed to the neck portion 100a.

However, in both the cathode ray tube devices shown in FIGS. 2 and 4, the centering magnet and the deflection coil are attached to the outer periphery of the neck portion by tightening with a tightening band. Therefore, if the tightening band is tightened too tightly to the neck part, there is a high risk that the glass neck part will break, and care must be taken when tightening the band. I was making it worse.

Therefore, the present applicant has further devised a cathode ray tube device 300 as shown in FIG. 6, and has already filed an application.

That is, in this cathode ray tube device, a mounting frame 112 is fitted and fixed into a neck portion 100a of a cathode ray tube 100, and the inner circumferential surface of a deflection coil support portion 112a provided at the rear of this mounting frame 112 and the neck portion 100 are connected to each other.
The deflection coil 103 is fitted and fixed between the outer peripheral surface of the mounting frame 112 and the centering magnet 105 is supported and fixed to the centering magnet support part 112b provided at the front of the mounting frame 112. Centering magnet 1
05 is mounted on the neck part 100a so that it is located on the face part 100c side, and the mounting frame 112 is fixedly attached to the cathode ray tube support 114 via the support piece 113.

According to such a cathode ray tube device, the deflection coil 1 can be fixed without tightening the resin holder with a tightening band.
03 and centering magnet 105, the common drawbacks of the cathode ray tube devices shown in FIGS. 2 and 4 can be solved, but the following problems still remain to be improved.

[Problem that the invention attempts to solve]

That is, in the cathode ray tube device shown in FIG. 6, the face surrounding frame 115 must be fixed to the face portion 100c of the cathode ray tube 100 with adhesive or the like. cannot be removed and reused, resulting in wasted parts. Moreover, the mounting frame 112
Since it is inserted into the neck part 100a of 0 and fixed only in a part thereof, it is insufficiently fixed.
There is a high possibility that the cathode ray tube 100 itself may move or vibrate slightly during operation, and there is also a risk that it may be pulled out from the mounting frame 112.

[Means for solving problems]

In order to solve the above-mentioned problem, the present invention involves fitting and fixing a mounting frame into the neck of a cathode ray tube, and aligning the inner circumferential surface of the deflection coil support provided at the rear of the mounting frame with the outer circumferential surface of the neck. In a cathode ray tube device, a deflection coil is inserted and fixed between the two, and a centering magnetic field generating means is supported and fixed to a magnetic field generating means support provided at the front part of the mounting frame.
A supporting piece of the face surrounding frame is provided to protrude forward, a ring supporting part is provided on the inner surface of the supporting piece, and a ring is externally fitted onto the funnel part of the cathode ray tube, and this ring is connected to the ring supporting part. It is characterized in that it is detachably attached to the support piece with the face surrounding frame in contact with the face of the cathode ray tube.

[Effect]

With this configuration, when replacing the cathode ray tube, the face surrounding frame can be removed from the support piece, the cathode ray tube replaced, and then the face surrounding frame can be attached to the support piece and reused. In addition, cathode ray tubes are
Since it is fixed in two places: the part where the mounting frame is inserted and fixed, and the ring support part, sufficient fixing force can be obtained.
Furthermore, the face surrounding frame acts as a stopper to prevent the cathode ray tube from being pulled out.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a side view, partially in section, of a cathode ray tube device according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a glass cathode ray tube whose interior is evacuated. An electron gun 2 is coaxially housed in the neck portion 1a of the cathode ray tube 1, and a stem portion 4 at the rear end. A plurality of lead wires 3 are inserted through. Further, a ring 5 made of elastic rubber, resin, or the like is fitted onto the outer peripheral surface of the funnel portion 1c.

Reference numeral 9 denotes a mounting frame made of a non-magnetic material such as resin, which is fitted and fixed into the neck portion 1a of the cathode ray tube 1. A deflection coil support portion 9a is provided at the rear of the mounting frame 9.
Between the inner circumferential surface of a and the outer circumferential surface of the neck portion 1a,
A deflection coil 6 is inserted. Then, the adhesive 11 filled in the hole of this deflection coil support part 9a.
The deflection coil 6 is fixed by. In this case, if sufficient fixation of both is not achieved,
It is sufficient to fix it with a fastener such as a screw, or conversely, if a sufficient fixing state can be obtained, it is sufficient to simply insert it.

Further, a magnetic field generating means support part 9b is provided at the front part of the mounting frame 9, and a centering magnet 7 as a centering magnetic field generating means is fitted into this support part 9b and is supported and fixed. This centering magnet 7 corrects the spot position of the electron beam when it is not deflected to the center of the fluorescent surface 8 inside the face portion 1b.

Furthermore, a face surrounding frame 1 is attached to the outer edge of the mounting frame 9.
A plurality of supporting pieces 9c of 0 are protruded forward, and on the inner side of the tip of each supporting piece 9c,
A hook portion 9d and a ring support portion 9e are formed on the inner surface side of the approximately central portion. The side surface of the ring 5, which is externally fitted onto the funnel part 1c, is in pressure contact with the ring support part 9e and is supported and fixed. At two locations on the inner peripheral surface of
It will be firmly fixed.

The face surrounding frame 10 is formed with a hook receiving part 10a, and by fitting the above-mentioned hook part 9d into this hook receiving part 10a, the face surrounding frame 10 is brought into contact with the face part 1b. In this state, it is detachably attached to the tip of the support piece 9c.
Note that 10b is a leg protruding from the lower end of the face surrounding frame 10, and is fitted into a groove (not shown) provided in a case (not shown) in which this cathode ray tube device is installed. be.

In this embodiment, the side surface of the ring 5 is in pressure contact with the ring support part 9e and is fixed by the frictional force. The support portion 9e may be fixed by being brought into contact with the distal end surface of the support portion 9e. Further, the mounting frame 9 of this embodiment includes a deflection coil support portion 9a, a magnetic field generation means support portion 9b, and a support piece 9.
c, etc. are formed integrally, but they may be made individually and joined. Furthermore, the means for attaching the support piece 9c and the face surrounding frame 10 is not limited to the fitting between the hook portion 9d and the hook receiving portion 10a as in this embodiment, but may be any other means that can be freely attached and detached. Needless to say, any mounting means can be used.

[Effect of idea]

As is clear from the above description, according to the present invention, the face surrounding frame is not fixed to the face of the cathode ray tube, but is detachably attached to the support piece, so when replacing the cathode ray tube, the face After the surrounding frame is removed from the support piece and the cathode ray tube is replaced, the face surrounding frame can be attached to the support piece and reused, eliminating waste of parts. In addition, since the cathode ray tube is fixed at two points: the inner peripheral surface of the mounting frame and the ring support, sufficient fixing force is obtained, and there is no risk of the cathode ray tube itself moving slightly or vibrating during operation. is equal to Moreover, the face surrounding frame is
Since it functions as a stopper to prevent the cathode ray tube from being pulled out, effects such as eliminating the fear of the cathode ray tube being pulled out can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view of a cathode ray tube device according to an embodiment of the present invention, FIG. 2 is a partially sectional side view of a conventional cathode ray tube device, and FIG. −
A sectional view taken along line A, FIG. 4 is a partially sectional side view of another conventional cathode ray tube device, and FIG. 5 is taken along line B-B in FIG.
FIG. 6 is a partially sectional side view of yet another conventional cathode ray tube device. Explanation of symbols: 1...Cathode ray tube, 1a...Net part, 1h...Face part, 1c...Funnel part, 5...Ring, 6...Deflection coil, 7...Centering magnetic field generating means, 9... Mounting frame, 9a...
...Deflection coil support part, 9b...Magnetic field generating means support part, 9c...Support piece, 9e...Ring support part, 1
0...Face surrounding frame.

Claims (1)

[Scope of claim for utility model registration] A mounting frame is inserted and fixed into the neck of a cathode ray tube,
A deflection coil is inserted and fixed between the inner circumferential surface of a deflection coil support provided at the rear of the mounting frame and the outer circumferential surface of the neck portion, and magnetic field generating means provided at the front of the mounting frame. In a cathode ray tube device in which a centering magnetic field generating means is supported and fixed on a support part, a support piece of the face surrounding frame is provided on the mounting frame to project forward, and a ring support part is provided on the inner surface side of the support piece. At the same time, a ring is externally fitted onto the funnel portion of the cathode ray tube, the ring is supported by the ring support portion, and with the face surrounding frame in contact with the face portion of the cathode ray tube, the supporting piece is A cathode ray tube device characterized by being detachably attached.