JPH09182098A - Picture quality compensation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a picture quality compensation device which can eliminate the part crossing a coil, can reduce the length of a lead wire to improve the emphasis performance of a contour part and also can be miniaturized by leading out a wire from the rear end of a cylinder part prepared to load a coil into a CRT and connecting a terminal to the wire to connect the terminal to an electric circuit of the rear part. SOLUTION: A lead wire 78 of a speed modulation coil consisting of two coils 80 and 82 is connected to a terminal 74 placed at the rear side (neck side) so as not to cross the crossover set between both coils 80 and 82. The speed modulation coil is inserted into a convergence magnet 90. Thus a picture quality compensation device is obtained, and a neck part 38 of a CRT 36 is inserted into the picture quality compensation device. Then the terminal 74 is connected to an auxiliary deflecting current correction circuit included in a CRT drive circuit 37 via a lead wire 30 and a connector 32. In such a constitution, the wire 78 never cross the crossover set between the coils 80 and 82. Thus the influence of the electromagnetic interference can be eliminated and the length of the wire 30 is reduced to improve the emphasis performance at a contour part. Then the picture quality compensation device can also be miniaturized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color television receiver, and more particularly to an image quality compensating device in which a velocity modulation coil is combined with a static convergence device used for an in-line type cathode ray tube.

[0002]

2. Description of the Related Art A static convergence device for correcting the position of an electron beam of an in-line type cathode ray tube is disclosed in Japanese Patent Publication No. 56-13066 and Japanese Utility Model Publication No. 58-23.
As disclosed in Japanese Patent No. 171, a speed modulation coil is used to flow an auxiliary deflection current of a primary differential waveform of a video signal so that the horizontal scanning speed of an electron beam is modulated in the brightness change portion of the video to make the contour of the video clear. It is generally practiced to configure an image quality compensation device.

An example of a conventional image quality compensation device having such an integrated structure is shown in FIGS. FIG. 5 shows a first conventional example (hereinafter referred to as conventional example 1), (a) is a front view of a holder to which a velocity modulation coil is attached, and (b) is a side view thereof.
6 is a second conventional example (hereinafter referred to as conventional example 2), (a) is a front view with a velocity modulation coil attached,
(B) is a side view thereof. However, the convergence magnet is omitted.

The image quality compensation device will be described with reference to FIG. Note that, for convenience, the upper side of the paper is described as the upper part and the lower side is described as the lower part, but the absolute positional relationship is not particularly specified. The image quality compensation device shown in FIG.
A holder including a terminal mounting portion 12 provided so as to surround the outer periphery of the cylindrical portion is provided at the end of the cylindrical portion, and two coils, that is, a lower coil 16 and an upper coil 18 are wound around the cylindrical portion 12. A winding part is provided.

A single insulating film conducting wire 17 is wound around the winding portion of the holder 14, and a coil is formed first on the lower side and then on the upper side to form a velocity modulation coil. The tip of this coil is soldered to the metal terminals 20 and 22 to be connected to an electric circuit (not shown).

FIG. 6 shows another example. The image quality compensation device of FIG. 6 includes a holder including a cylindrical portion 42 and terminal mounting portions 44 provided above and below the cylindrical portion 42 at the end of the cylindrical portion 42, as in FIG. Is provided with winding parts 54 and 56 around which two coils, that is, the lower coil 60 and the upper coil 62 are wound.

A single insulating film conducting wire 64 is wound around the winding portions 54 and 56 of the holder 40, and a coil is formed first on the lower side and then on the upper side to form a velocity modulation coil. The tip of this coil is soldered to the metal terminals 46 and 48 to be connected to an electric circuit (not shown).
Unlike FIG. 5, the terminal mounting plate 44 is provided not on the end but on the outer periphery.

Velocity modulation coils 16, 18 and 60, 6
2 with the cylindrical part (10 and 4) of FIGS.
2) and the magnet assembly of the cylindrical portion, for example, a set of two convergence magnets (not shown) each having 2 poles, 4 poles, and 6 poles are inserted through a ring (not shown) for corotation, and fitted. Then, the image quality compensation device is configured.

In any of the examples, there is a portion A that intersects the side surface of the cylindrical portion. Therefore, conventionally, there arises a problem that the work of assembling the winding and the like becomes complicated. In addition, there is a problem that the magnetic field between the lines is interfered by the current flowing through the coil.

Further, in order to explain the conventional problems,
7 and 8 show a state in which the image quality compensation device described above is attached to a cathode ray tube. The image quality compensation device of FIG. 5 is attached to FIG. 7, and the image quality compensation device of FIG. 6 is attached to FIG.
Shown in 7 (a) and 8 (a) are of a type in which a circuit board is directly attached to the terminal attachment portion of the image quality compensation device and the metal terminals are directly connected to a correction current generating circuit (not shown) on the circuit board. 7B and FIG. 8B.
Shows a type which is connected to an auxiliary deflection current generating circuit on a circuit board through a connected lead wire and a connector at its tip.

As shown in FIGS. 7 (a) and 8 (b), the one in which the circuit board (picture tube drive circuit) 28 is directly connected to the terminal mounting portion 44 has an advantage such as a shortened lead wire. In addition to the fact that another board is required in addition to the board of the picture tube drive circuit 28, the mounting portion of this board 28 must be provided around the picture tube. It causes big problems such as taking a large amount. As a result, the overall size of the television receiver becomes large, or the design of the housing is greatly restricted. Therefore, although the lead wire is shorter, this type is rarely used at present,
Instead of this, it is general to use the type shown in FIGS. 7B and 8B.

In this type, the correction current generating circuit is C
It is incorporated in the RT drive substrate 37 in the same manner as the CRT drive circuit, and is connected to the auxiliary deflection current generating circuit on the CRT drive substrate 37 via the lead wire 30 and the connector 32 at the tip thereof. Therefore, it is not necessary to separately prepare a substrate, and in this respect, as shown in FIG.
It is possible to solve the problems that occurred in the devices of the types (a) and 8 (b). However, the new issue here is
It is the length l of the lead wire from the auxiliary current generating circuit to the coil. That is, since the auxiliary deflection current, which is the output signal from the auxiliary deflection current generation circuit, is a signal created by differentiating the video signal, it becomes a very wide band signal. Therefore, when supplying such a signal to the coil as the original signal, it is necessary to make the length l of the lead wire extremely short. That is, when the lead wire 1 becomes long, the signal waveform is disturbed, and the speed modulation performance deteriorates. The cathode ray tube has a reference numeral 36.
The deflection coil is denoted by reference numeral 34, and the image quality compensation device is denoted by reference numerals 26 and 68.

[0013]

As described above, the conventional example 1
Then, there was a problem such as directly increasing the size of the circuit board.

In the conventional example 2, although it is not necessary to provide a separate substrate, there is a problem that the lead wire becomes long, the DC resistance loss increases, and the performance deteriorates.

Further, in any of the conventional examples, since a portion intersecting with the winding portion of the velocity modulation coil appears, not only the assembly becomes complicated, but also the influence of electromagnetic interference cannot be ignored. was there.

Therefore, in view of the above problems, the present invention provides an image quality compensator capable of eliminating the intersecting portion, shortening the lead wire, enhancing the performance of emphasizing the contour portion and reducing the size.

[0017]

In order to solve the above problems, a wire rod is drawn out from a rear end of a cylindrical portion for mounting a coil, and a terminal is provided here to connect to a rear electric circuit. is there.

Here, the windings of the upper and lower portions of the cylindrical portion are provided with terminals at their rear ends for connection.

Since the terminal is provided at the rear end, the connecting portion with the circuit board for driving the picture tube provided at the rear portion of the neck can be constructed short.

Therefore, the DC resistance loss can be suppressed as much as possible and the terminal is provided at the rear end portion, which facilitates the assembling work.

Since the first and second coils do not intersect on the side surface of the cylindrical portion, there is no interference between the coils, and the work such as assembling is simplified.

Specifically, the intersecting portion can be easily removed by the arrangement of the terminal portion connected to the lead portion and the winding order of the coil.

[0023]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an example of an image quality compensation device that is a mode of the present invention. FIG. 1A is a front view, and FIG. 1B is a side view. The left side of the drawing is on the neck side of the cathode ray tube, and the right side is on the side of the deflection yoke. The upper side and the lower side are described for explaining the coil winding portion, and do not show an absolute positional relationship. The terminal can be attached to the portion indicated by B in the figure.

Further, FIG. 1 shows winding parts and supporting parts 71 and 77 for winding a rectangular coil. Further, the terminal portion 74 is shown so that the mounting position of the terminal, which is a characteristic part of the present application, can be seen. In the figure, the hatched portion is the coil portion.

The terminal portion 74 is provided at the rear end 72 of the cylindrical portion so that the connecting lead with the circuit board can be shortened. It should be noted that square terminals 75 and 76 made of solder-plated hard copper wire are fixed to the edge of the terminal portion, and the terminal 75 is
The side terminal is such that the terminal 76 constitutes a + side terminal.
In addition, the crossing portion, which was another problem, was wound by winding it as shown in FIG. FIG. 2 is a diagram showing the winding sequence.

A description will be given with reference to FIG. A wire is drawn from the terminal 76 and wound around the winding portion 71 to form the lower coil first. FIG. 2A shows a winding portion 71 at four corners.
It is a figure when the wire 80 is wound around and the rectangular coil is formed, and the lower coil is wound in the order shown by the arrow in the figure. Further, a winding wire 82 is provided on the winding portion 77 located above and a lead portion is connected to the other terminal 75 to form a velocity modulation coil. Incidentally, in order to make the difference from the conventional one easy to understand, the intersection A is shown in FIG. FIG. 3 shows an image quality compensating device assembled by mounting the magnet assembly on the outer circumference of the cylinder of the velocity modulation coil described with reference to FIGS. 1 and 2.

FIG. 3 (a) is a front view and FIG. 3 (b) is a side view. The figure is a view seen from the left side in the drawing. 3 (a) and 3 (b) are examples of the mounting positions of the terminals, and the mounting terminals 74 may be mounted anywhere within the range shown in FIGS. 3 (a) and 3 (b).

The convergence magnet 90 includes a pair of two-pole convergence magnets 91 for adjusting the purity, a pair of four-pole convergence magnets 92 for adjusting the side beam, and a pair of two side-beam adjusting magnets for adjusting the side beam. It consists of 6-pole convergence 93. A ring 94 for preventing co-rotation is provided between the 2-pole convergence magnet 91 and the 4-pole convergence magnet 92, and co-rotation prevention and convergence are provided between the 4-pole convergence magnet 92 and the 6-pole convergence magnet 93. Magnets 92 and 9
A spring-shaped ring 95 having an elastic force is provided in order to give a rotational torque to the motor 3. Further, in order to reliably hold down the magnets 91, 92, 93, a band 96 is provided, which is tightened with a tightening screw 97 and fixed to the neck portion of the cathode ray tube.

FIG. 4 shows the image quality compensation device fitted and attached. FIG. 4 shows an example in which a velocity modulation coil is connected to an auxiliary deflection current generating circuit (not shown) on a circuit board 35 via a lead wire 30 connected to a metal terminal and a connector 32 provided at the tip thereof. is there.

In the image quality compensating apparatus of the present invention, since the terminal mounting portion 74 is located behind the velocity modulation coil 70 in the axial direction of the cylindrical portion, the connecting lead wire 30 can be shortened. In addition, the convergence magnet 90 can be brought closer to the auxiliary deflection current generating circuit equivalently, and the performance can be improved.

[0031]

As described above, according to the present invention as set forth in claim 1, since the terminal is provided at the rear end of the neck, it can be connected to a substrate such as a CRT drive circuit with a short lead wire, and a DC resistance loss can be obtained. It becomes possible to suppress such as possible. Therefore, the contour compensation characteristic is improved and the reliability is increased.

[Brief description of the drawings]

FIG. 1 is a diagram showing an image quality compensation device of the present invention.

FIG. 2 is a diagram showing a winding sequence of windings of the velocity modulation coil shown in FIG.

FIG. 3 is a diagram in the case where a convergence magnet is attached to the velocity modulation coil in FIG.

FIG. 4 is a diagram showing a state in which the image quality compensation device of FIG. 3 is attached to a cathode ray tube.

FIG. 5 is a diagram showing a conventional image quality compensation device.

FIG. 6 is a diagram showing another image quality compensation device.

7 is a diagram showing a state in which the image quality compensation device of FIG. 5 is attached to a cathode ray tube.

FIG. 8 is a diagram showing a state in which the image quality compensation device of FIG. 6 is attached to a cathode ray tube.

[Explanation of symbols]

 30 ... Lead wire 36 ... Cathode ray tube 38 ... Neck 70 ... Holder 71, 77 ... Winding part 74 ... Terminal l ... Lead wire length

Claims (2)

[Claims] 1. An image quality compensating device comprising a static convergence device fitted in a neck portion of an in-line type cathode ray tube and a velocity modulation coil comprising first and second coils for contour compensation, the image quality compensating device. An image quality compensating device, characterized in that connection parts (terminals) of the first and second coils are provided at the rear end and at the rear of the velocity modulation coil. 2. An image quality compensating apparatus, wherein the first and second coils do not intersect on a side surface of a cylindrical portion.