JPH0432493B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for assembling a deflection yoke that is used by being inserted into the neck of a cathode ray tube in a color television receiver or the like. The deflection coil is constructed as shown in FIGS. 1 and 2. That is, the deflection yoke 1
This has a structure in which a semi-toroidal core 5 around which a vertical deflection coil 4 is wound is fitted onto the outside of a hollow conical bobbin 3 with a horizontal deflection coil 2 mounted inside. In addition, 6 is an opening of the bobbin 3, 7 is a protrusion for positioning, 8 is a mating surface of the core 5, and 9 is a clamp for connecting the core 5.

For convenience of explanation, when the deflection yoke 1 is assembled into a cathode ray tube (not shown), the central axis of the cathode ray tube (not shown) is expressed as Z-Z', the horizontal direction of the screen of the cathode ray tube is expressed as X-X', and the vertical direction is expressed as X-X'. Y-
It is expressed as Y′.

Generally, the vertical deflection coil 4 combined as described above is positioned by directly contacting the outer peripheral surface of the bobbin 3.

However, with this assembly method, each coil 2, 4 cannot be optimally adjusted due to variations in the shape and dimensions of the bobbin 3 and core 5, and variations in the winding state of the horizontal deflection coil 2 and vertical deflection coil 4. cannot be combined into a perfect state. Therefore, when such a deflection yoke is incorporated into a product, misconvergence occurs, and convergence correction is required during product assembly work, requiring a great deal of adjustment time and effort.

An object of the present invention is to provide a method for assembling a deflection yoke, which eliminates the drawbacks of the prior art described above, and assembles a horizontal deflection coil and a vertical coil in an optimal state so that the amount of misconvergence is minimized when assembling the deflection yoke. , to provide assembly equipment for implementing it.

In order to achieve the above object, in the present invention, a bobbin equipped with a horizontal deflection coil is fitted onto the neck of a cathode ray tube for projecting a pattern for convergence detection, and a core with a vertical coil wound around the bobbin. The present invention is characterized in that the bobbin and the core are fitted onto the outside, the bobbin and the core are moved and positioned so that the convergence of the pattern projected on the cathode ray tube is in the best condition, and then the bobbin and the core are fixed.

An embodiment of the present invention will be described below with reference to the drawings.

Figures 3 to 11 show an embodiment of the present invention. In the figures, 16 is a color cathode ray tube (hereinafter simply referred to as a cathode ray tube) for detecting convergence, and a deflection yoke 1 is inserted into the neck part. . 17 is a pattern generator that generates a required pattern on the cathode ray tube. 18 is an ITV camera that faces the screen of the cathode ray tube 16 and photographs the pattern projected on the screen and converts it into an electrical signal.
19 is a detection circuit that detects the convergence state of the pattern projected on the screen of the cathode ray tube 16 from the electrical signal applied from the ITV camera 18; Reference numeral 20 indicates the horizontal deflection coil 2 and the vertical deflection coil 4 of the deflection yoke 1, that is, the bobbin 3 and the core 5, based on the signal applied from the detection circuit 19.
Arithmetic circuit that calculates the amount of adjustment. 21 holds the opening 6 of the bobbin 3 and rotates the bobbin 3 based on a signal applied from the arithmetic circuit 20;
Rotary drive means for positioning the horizontal deflection coil 2. A driving means 22 holds the core 5, and a driving means 23 rotates the core 5 and moves the core 5 in a plane orthogonal to the axis based on a signal applied from the arithmetic circuit 20 to position the vertical deflection coil 4. An adhesive supply device whose one end faces the joint between the opening 15 of the core 5 and the outer peripheral surface of the bobbin 3, and supplies a fixed amount of adhesive to the joint. Reference numeral 24 denotes a control device that operates the pattern generator 17, ITV camera 18, detection circuit 19, arithmetic circuit 20, and adhesive supply device 23 in a predetermined order. 25 is a positioning jig for holding the deflection yoke 1 inserted into the cathode ray tube 16. 26 is the positioning jig 25
A stand for fitting and holding onto the neck portion of the cathode ray tube 16. 27 is a guide ring fixed to the stand 26; 28 is the guide ring 2
7 is rotatably supported via a bearing 29, and serves as a holder for holding the bobbin 2.
A groove 30 into which the opening 6 and the protrusion 7 fit is formed. 31 is an arcuate rack formed on the holder 28; 32 is a motor supported on the stand 26 via a bracket 33;
A pinion 34 fixed to the rotating shaft is arranged to mesh with the rack 31. and,
The holder 28 serves as a positioning jig for the bobbin 2, and the motor 32, pinion 34 and rack 31 constitute rotational driving means. Therefore, when the motor 32 operates, the pinion 34 and the rack 3
The holder 28 is rotated via the bobbin 1, and the bobbin 2 can be rotated. A main base 35 is rotatably supported by a guide ring 27 via a bearing 36, and an arcuate rack 37 is formed at its upper end. 38 is bracket 39
A motor is supported at the upper end of the stand 26 via a motor, and a pinion 4 is fixed to its rotating shaft.
0 is arranged to mesh with the rack 37. Therefore, when the motor 38 operates, the main base 35 rotates around the guide ring 27. 41 is each pair of sliding guides 42
A pair of sliding blocks 43 are slidably supported in the Y-Y' direction of the deflection yoke 1 on both sides of the main base 35 via a pair of sliding guides 44. A base is supported on the block 41 so as to be slidable in the X-X' direction of the deflection yoke 1, a helical rack 45 is fixed to one end in the Y-Y' direction, and a nut is attached to one end in the X-X' direction. 46 is fixed. Reference numeral 47 denotes a motor supported by the sliding block 41 via a holding plate 48, and a worm gear 49 fixed to the rotating shaft of the motor is arranged so as to mesh with the helical rack 45. Therefore, due to the operation of the motor 47,
The base 43 moves in the direction of X-X' of the deflection yoke 1. Reference numeral 50 denotes a holding plate 52 that is slidably supported in the X-X' direction of the deflection yoke 1 by a sliding guide 51 at the lower end of the main base 35.
A screw 53 fixed to the rotating shaft of the motor is arranged to be screwed into the nut 46. Reference numeral 54 designates a guide bar that is erected on the holding plate 52, and is slidably passed through holes formed on both sides of the nut 46. Therefore, when the motor 50 operates, the base 43 moves in the YY' direction of the deflection yoke 1. Further, when the motor 47 operates and the base 43 moves in the direction of X-X' of the deflection yoke 1, the nut 4
6. The holding plate 52 moves in the same direction with the base 43 via the guide bar 54, and the nut 46 and screw 5
The relative position of 3 does not change. The main base 35, the motor 38 for rotating the main base 35, the sliding block 41, the base 43, and the base 43 are arranged in the X-X' direction and the Y direction.
-Motor 47 and motor 50 for moving in the Y′ direction
The driving means is constituted by the following. 56,5
Blocks 5 7 are supported by the base 43 at a predetermined interval so as to face each other across the deflection yoke 1 inserted into the neck portion of the cathode ray tube 16.
Reference numeral 8 denotes guide bars that are erected on opposing surfaces of the blocks 56 and 57 so as to face each other. Reference numerals 59 and 60 refer to movable blocks supported via bushes 61 which are slidably fitted into the guide bar 58, and pieces 62, which hold the neck portion 14 of the core 5 of the deflection yoke 1 on their opposing surfaces. The core 5 of the deflection yoke 1 is supported by the tip of a shaft 65 that slidably passes through a bush 63 and a bush 64 press-fitted into the movable blocks 59 and 60, respectively, and is biased by a spring 66 so as to approach each other. and pieces 67 and 68 for holding the opening 15 of. Reference numeral 69 denotes guide blocks arranged at predetermined intervals below the base 43. Reference numeral 70 denotes a connecting rod that is slidably fitted into a groove 71 formed in the guide block 69. 7
A cylinder 2 is supported by the base 43 through a bracket 73, and one end of a rod 74 is connected to the movable block 59 and the connecting rod 70 through a connecting plate 75. 76 is the connecting rod 7
Rack fixed to one end of 0. Numeral 77 is a gear fixed to a shaft 80 rotatably supported by a bearing 78 fixed to the base 43 via a bearing 79, and is arranged to mesh with the rack 76. Reference numeral 81 denotes a guide fixed on the block 57. Reference numeral 82 is a rack fixed to one end of an arm 83 which is fixed to the back surface of the movable block 60 and extends so as to come into contact with the guide 81, and is arranged to mesh with the gear 77. With such a structure, when the cylinder 72 is operated, the movable block 59 and the connecting rod 70 move in the direction of X-X' of the deflection yoke 1. At the same time, the rack 76 fixed to the connecting rod 70 rotates the gear 77, causing the rack 82 to move.
The movable block 60 is moved in the X-X' direction. At this time, since the moving directions of the racks 76 and 82 are opposite, the movable blocks 59,
60 simultaneously move toward or away from each other. Therefore, the core 5 can be held and released. In addition, the opening 15 of the core 5
The pieces 67 and 68 that hold the movable blocks 59 and 6
0, since it is slidable, the neck portion 14 and opening 15 of the core 5 can be held securely. 84 is a nozzle extending from the adhesive supply device 23.

In the above configuration, the deflection yoke 1, in which the space between the vertical coil 4 and the bobbin 3 is not fixed, is inserted into the neck of the cathode ray tube 16, the opening 6 of the bobbin 3 is fitted into the groove of the holder 28, and the bobbin 3 is It is held in the holder 28. Then, when the cylinder 72 is actuated to project the rod 74, the movable blocks 59 and 60 come close to each other, and the pieces 62 and 63 are brought into contact with the core 5.
The pieces 67 and 68 hold the opening 15 of the core 5 between the neck portion 14 of the core 5 and the opening 15 of the core 5, respectively. In this state, the lead wires (not shown) of the horizontal deflection coil 2 and the vertical deflection coil 4 of the deflection yoke 1 are connected to the pattern generator 17, and the pattern generator 17 is operated to generate a predetermined pattern (for example, a cathode ray tube). A grid-like pattern consisting of one to several lines each running horizontally and vertically across 16 screens is projected.
This pattern is photographed by an ITV camera 18, converted into an electrical signal, and applied to a detection circuit 19. Detection circuit 1
At step 9, the pattern projected on the cathode ray tube is detected based on the electrical signal applied from the ITV camera 18. This detection consists of two points on a vertical green line projected in the center of the CRT screen (two points equally spaced vertically from the center of the screen).
This is done by measuring the time it takes for the scanning line passing through that point to reach the absolute color line from the synchronization signal. This detection result is applied to the arithmetic circuit 20, and the inclination amount and direction of the pattern, the correction amount, and the correction direction are calculated from the detection results of the two points. Based on this calculation result, a required number of pulses are applied to the motors 32 and 38 to rotate the holder 28 and main base 35 and correct the horizontal deflection coil 2 and vertical deflection coil 4 so that the pattern becomes vertical. do. Next, patterns are sequentially displayed for each color of green, red, and blue on the cathode ray tube 16, and after detecting the amount of horizontal deviation of the red and blue patterns with respect to the green pattern at several locations on the screen of the cathode ray tube 16, the ITV The current in each coil of the deflection yoke of the camera 18 is switched, the scanning direction of the ITV camera 18 is changed by 90 degrees, and the amount of vertical deviation of the red and blue patterns with respect to the green pattern is detected in the same manner as described above. The arithmetic circuit 20 calculates the correction amount and direction of the vertical deflection coil 4 from the modes of the horizontal and vertical deviation amounts for each color. Based on this calculation result, necessary pulses are applied to the motors 47 and 50 to move the base 43 and the vertical deflection coil 4 to perform correction. and,
The convergence of the pattern projected on the cathode ray tube 16 is detected again, and if it is not within the standard value range, the horizontal deflection coil 2 is detected again using the above procedure.
and positioning of the vertical deflection coil 4. When the convergence value falls within the standard value, the adhesive supply device 2
3 through a nozzle 84, a predetermined amount of adhesive is supplied between the bobbin 3 and the vertical coil 4, and the adhesive is fixed.

As described above, according to the present invention, a deflection yoke is attached to the neck portion of a cathode ray tube for projecting a pattern for convergence detection, and the bobbin and core are held separately, so that the pattern projected on the cathode ray tube is After detecting the convergence state and adjusting the positions of the bobbin and core, the bobbin and vertical deflection coil are fixed with adhesive. can be assembled so that the misconvergence is below the standard value, and adjustments can be made in a short time after being incorporated into the product. Therefore, there are effects such as the ability to greatly improve the workability of product assembly.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the deflection yoke, FIG. 2 is a bottom view of FIG. 1, FIG. 3 is a block diagram of the assembly device according to the present invention, and FIG. 4 is a positioning jig and its drive. 5 is a right side view of FIG. 4, FIG. 6 is a partially omitted plan view of FIG. 4, and FIG. 7 is a partial sectional view of FIG. Figure 8 is
4 is a rear view, FIG. 9 is an enlarged plan cross-sectional view of FIG. 4, FIG. 10 is an enlarged view of FIG. 9, and FIG. 11 is a side partial cross-section showing the piece drive mechanism. It is a diagram. 1...Deflection yoke, 2...Horizontal deflection coil, 3
...bobbin, 4 ... vertical deflection coil, 5 ... core, 16 ... cathode ray tube, 17 ... pattern generator, 18 ... ITV camera, 19 ... detection circuit,
20... Arithmetic circuit, 21... Rotation drive means, 22
... Drive means, 24 ... Control means, 25 ... Positioning jig.

Claims (1)

[Claims] 1. A bobbin equipped with a horizontal deflection coil is fitted onto the neck of a cathode ray tube that projects a desired pattern, and a core with a vertical deflection coil wound around the bobbin is fitted onto the neck, and the cathode ray tube is operated;
A method for assembling a deflection yoke, which comprises positioning the bobbin and the core so that the amount of misconvergence of a pattern developed on a cathode ray tube falls within a standard value, and then fixing the bobbin and the core.