JPS5832189Y2 - Cathode ray tube magnet adjustment device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an adjustment device for a cathode ray tube magnet.

Conventionally, a projection television receiver has been known as one of the video devices using a cathode ray tube.

This projection television receiver has dedicated cathode ray tubes for each of the colors red, green, and blue.
There is a configuration in which the screens of several cathode ray tubes are projected onto a screen and combined to obtain a desired color.

As shown in FIG. 5, a cathode ray tube magnet of this type of receiver, for example a focus adjustment magnet, has four support columns surrounding a through hole 1a in a rear plate 1 into which the neck of the cathode ray tube is inserted and held. 2, align the screw hole of the magnet holding member 3 with the long hole 2a provided at the end of the support column 2, and then tighten the mounting screw 4.
The magnet holding member 3 was attached to the support column 2 and the magnet 5 was held by inserting it into the elongated hole 2a and screwing it into the screw hole of the magnet holding member 3.

In order to adjust the three adjustment elements of the longitudinal position, vertical and horizontal position, and inclination of the magnet 5 with respect to the rear plate 1, four long holes 2a provided in the four support columns 2 and four mounting screws are used. However, with this method, it is extremely difficult to simultaneously adjust the three adjustment elements to the best condition.

It is an object of the present invention to solve these problems and to make it possible to easily adjust the position of a magnet that is loosely fitted into the neck of a cathode ray tube.

Embodiments of the present invention will be described below with reference to the drawings of FIGS. 1 to 4.

In the figure, 11 is a cathode ray tube, a mounting bracket having a mounting hole 12a is fixed to the outer periphery of the front part 11a (fluorescent surface side), and a deflection yoke 13 having a tightening part 13a is fixed to the neck part 11b. A mounting bracket 14 with a screw hole 14a is fixed.

Reference numeral 15 indicates three through holes 15a for inserting the cathode ray tube 11 and a screw hole 15b corresponding to the mounting hole 12a of the mounting bracket 12.
The front portion 11a of the cathode ray tube 11 is held by aligning the mounting hole 12a of the mounting bracket 12 with the screw hole 15b and screwing the mounting screw 16 into the front plate.

Reference numeral 17 denotes a reinforcing member having a Y-shaped cross section, whose pronged end is attached to the front plate 15, and a rear plate 19 is attached to the other end with mounting screws 18.

This rear plate 19 has a through hole 19a into which the neck portion 11b of the cathode ray tube 11 is inserted, and a screw hole 14 of the mounting bracket 14.
The through hole 19b corresponding to a and the mounting hole 2 of the magnet base 20
A screw hole 19c corresponding to 0a is provided.

By aligning the screw holes 14a of the mounting bracket 14 with the through holes 19b and screwing in the mounting screws (not shown), the rear plate 19
The neck portion 11b of the cathode ray tube 11 is held.

The base 20 is attached to the rear plate 19 by aligning the attachment holes 20a of the magnet base 20 with the screw holes 19c of the rear plate 19 and screwing in the attachment screws 21.

This magnet base 20 is attached to the cathode ray tube 11 as shown in FIG.
The main plane is inclined by an angle α with respect to the rear plate 19 so that the main plane is perpendicular to the neck portion 11b of the cathode ray tube 11.

Three guide screws 22 are installed on the main plane of the base 20 so as to extend vertically.

23 is a compression spring loosely fitted to the guide screw 22; 24;
2 is a magnet holder which holds a ring-shaped magnet 25 and has a through hole 24a into which the guide screw 22 is inserted; 26 is an engaging member disposed between the through hole 24a of the magnet holder 24 and the guide screw 22; The engaging member 26 is the guide screw 2
2 is inserted into the center hole 26a, and an inclined portion 26b is engaged with the through hole 24a of the magnet holder 24.

27 is a nut screwed into the guide screw 22.

In the above embodiment, when the NAND 2γ is tightened, the magnet 25 moves forward in the direction of the rear plate 19.

When three nuts 27 arranged in an equilateral triangle are tightened evenly, the magnet 25 moves in parallel, but 1
The magnet 25 can be tilted by tightening just one or two.

In this case, a twisting force is generated between the guide screw 22 and the engaging member 26, but the through hole 24a of the magnet holder 24 and the engaging member 26 are loosely engaged, and the engaging member 26
Point A of 6b engages with the through hole 24a, and since this joining point A moves at any time, no unreasonable twisting force is applied to the magnet 25, and the magnet 25 is reliably stabilized without wobbling.

When moving the magnet 25 in the radial direction of the neck portion 11b of the cathode ray tube 11, the magnet 25 can be freely adjusted within the range of the mounting hole 20a of the base 20 by loosening the mounting screw 21.

There are three mounting screws 21, but only one is shown in the figure.

3 and 4 show other shapes of the engaging member 26, the former being spacecraft capsule shaped and the latter spherical.

As described above, the present invention includes a front plate that holds the front portion of a cathode ray tube, a rear plate that is connected to the front plate and has a through hole through which the neck portion of the cathode ray tube is inserted, and a rear plate that is connected to the front plate and has a through hole through which the neck portion of the cathode ray tube is inserted. A base having a through hole that communicates with the rear plate and being attached to the rear plate, at least three guide screws implanted in the base, a ring-shaped magnet provided in place of one of the neck parts, and a ring-shaped magnet provided in place of the neck part; a magnet holder that holds the magnet and has a through hole through which the guide screw is inserted; a coil spring that biases the magnet in a direction in which the magnet moves away from the rear plate; A connecting member to be fitted together and a nut to be screwed to the guide screw, a through hole having a diameter slightly larger than the diameter of the mounting screw is formed in the base, and the base is fixed to the rear plate with the screw, This is a cathode ray tube magnet adjustment device in which the connecting member is provided with an inclined part that comes into contact with the edge of the through hole of the magnet holder, and the longitudinal position, horizontal and vertical positions, and inclination of the magnet can be easily and reliably adjusted.

Further, since the coupling member is formed with an inclined portion, which comes into contact with the edge of the through hole of the magnet holder, the magnet holder can be adjusted without wobbling.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a cathode ray tube magnet adjustment device according to an embodiment of the present invention, and FIG. 2 is a side sectional view of the main parts of the same device.
3 and 4 are side sectional views showing other shapes of the engaging member of the device, and FIG. 5 is an exploded perspective view of the conventional device. 11...Cathode ray tube, 11b...Neck part, 15...
・Front plate, 17... Reinforcement member, 19... Rear plate, 20.
...Magnet base, 22...Guide screw, 23...Compression spring, 24...Magnet holder 25...Magnet, 26...Engaging member, 27...Nut.

Claims (1)

[Scope of utility model registration request] a front plate that holds the front portion of the cathode ray tube; a rear plate that is connected to the front plate and has a through hole through which the neck portion of the cathode ray tube is inserted; and a through hole in the center through which the neck portion of the cathode ray tube is inserted; a base attached to the rear plate; at least three guide screws implanted in the base; a ring-shaped magnet provided at one ledge of the neck; A magnet holder having a through hole through which a guide screw is inserted, a coil spring that biases the magnet in a direction in which the magnet moves away from the rear plate, and a coupling that is fitted into the guide screw that passes through the through hole of the magnet holder. a member and a nut that is screwed onto the guide screw, a through hole having a diameter slightly larger than the diameter of the mounting screw is formed in the base, the base is fixed to the rear plate with the screw, and the connecting member is provided with a nut screwed onto the guide screw. A magnet adjustment device for a cathode ray tube, which is provided with an inclined portion that comes into contact with the edge of the through hole of the magnet holder.