JP3767931B2 - Image quality compensation device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an image quality compensator in which a speed modulation coil is combined with a static convergence device used in a color television receiver, in particular, an in-line type cathode ray tube.
[0002]
[Prior 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. 58-23171. In general, an image quality compensator is configured by combining a velocity modulation coil for supplying an auxiliary deflection current of a first-order differential waveform of a video signal so that the outline of the video is clarified by modulation in FIG.
[0003]
An example of such a conventional image quality compensator having an integral structure is shown in FIGS.
5A and 5B show a first conventional example (hereinafter referred to as Conventional Example 1), in which FIG. 5A is a front view of a holder to which a speed modulation coil is attached, and FIG. 5B is a side view thereof. FIG. 6 is a second conventional example (hereinafter referred to as Conventional Example 2), (a) is a front view with a speed modulation coil attached, and (b) is a side view thereof. However, the convergence magnet is omitted.
[0004]
The image quality compensation device will be described with reference to FIG.
For convenience, the upper part of the drawing is described as the upper part, and the lower part is indicated as the lower part. However, the absolute positional relationship is not particularly specified.
The image quality compensation apparatus shown in FIG. 5 includes a holder including a cylindrical portion 10 and a terminal mounting portion 12 provided at an end of the cylindrical portion so as to surround the outer periphery of the cylindrical portion. A winding portion for winding the individual coils, that is, the lower coil 16 and the upper coil 18 is provided.
[0005]
One insulating film conducting wire 17 is wound around the winding portion of the holder 14, and a coil is first formed on the lower side and then on the upper side to constitute a speed modulation coil. The tips of the coils are soldered to the metal terminals 20 and 22 and are connected to an electric circuit (not shown).
[0006]
FIG. 6 shows another example.
Similar to FIG. 5, the image quality compensator of FIG. 6 includes a holder including a cylindrical portion 42 and terminal mounting portions 44 provided at the upper and lower portions of the cylindrical portion 42 at the end of the cylindrical portion 42. Are provided with winding portions 54 and 56 for winding two coils, that is, a lower coil 60 and an upper coil 62.
[0007]
One insulating film conducting wire 62 is wound around the winding portions 54 and 56 of the holder 40, and a coil is first formed on the lower side and then on the upper side to constitute a speed modulation coil. The tip of this coil is soldered to the metal terminals 46 and 48 to connect to an electric circuit (not shown).
Unlike FIG. 5, the portion of the terminal mounting plate 44 is provided not on the end portion but on the outer periphery of the cylindrical portion 42.
[0008]
5 and 6 to which the velocity modulation coils 16, 18 and 60, 62 are attached, and the magnet assembly of the cylindrical portion, for example, a set of 2 poles, 4 poles and 6 poles each in pairs. A convergence magnet (not shown) is inserted and fitted through a ring (not shown) for preventing co-rotation to constitute an image quality compensation device.
[0009]
In any example, there is a portion A that intersects on the side surface of the cylindrical portion. Therefore, conventionally, there arises a problem that the assembling work such as winding becomes complicated. In addition, there is a problem that magnetic field interference occurs between wires due to current flowing in the coil.
[0010]
Further, in order to explain the conventional problems, FIGS. 7 and 8 show a state in which the above-described image quality compensation device is attached to the cathode ray tube. FIG. 7 shows the image quality compensation device of FIG. 5 attached, and FIG. 8 shows the image quality compensation device of FIG. 6 attached.
FIGS. 7A and 8A are of a type in which the circuit board is directly attached to the terminal attachment portion of the image quality compensation device, and the metal terminal is directly connected to a correction current generating circuit (not shown) on the circuit board. 7 (b) and 8 (b) show a type that is connected to the auxiliary deflection current generating circuit on the circuit board via the connected lead wire and the connector at the tip thereof. is there.
[0011]
As shown in FIGS. 7A and 8A, connecting the circuit board (auxiliary deflection current generating circuit) 28 directly to the terminal mounting portions 12 and 44 has an advantage of shortening the lead wire. In addition to the CRT drive circuit substrate 37, not only another substrate is required, but also the mounting portion of the substrate 28 must be provided around the picture tube, so that the location inside the television receiver is more than necessary. It causes problems such as taking large. As a result, the overall size of the television receiver is increased, or the design of the housing is greatly restricted.
Therefore, although the lead wire is shortened, this type is rarely used at present, and it is common to use the type shown in FIGS. 7B and 8B instead. ing.
[0012]
In this type, the correction current generation circuit is incorporated in the CRT drive board 37 in the same manner as the CRT drive circuit, and the auxiliary deflection current generation circuit on the CRT drive board 37 is connected via the lead wire 30 and the connector 32 at the tip thereof. Connected to. Therefore, it is not necessary to prepare a separate substrate, and in this respect, the problem that has occurred in the apparatus of the type shown in FIGS. 7A and 8A can be solved. However, a new problem here 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 an output signal from the auxiliary deflection current generating circuit, is a signal created by differentiating the video signal, the signal band is a very wide band signal. Therefore, when such a signal is supplied to the coil as the original signal, it is necessary to make the lead wire length l very short. That is, when the lead wire l becomes long, the signal waveform is disturbed, and the speed modulation performance deteriorates. The cathode ray tube is denoted by reference numeral 36, the deflection coil is denoted by reference numeral 34, and the image quality compensator is denoted by reference numerals 26 and 68.
[0013]
[Problems to be solved by the invention]
As described above, the conventional example 1 has a problem that the internal structure of the color television is complicated and enlarged.
[0014]
In Conventional Example 2, it is not necessary to provide a separate substrate, but there is a problem that the lead wire becomes long, the DC resistance loss increases, and the performance deteriorates.
[0015]
Further, in any conventional example, there is a problem that the crossing portion appears in the winding portion of the speed modulation coil, so that the assembly becomes complicated and the influence of electromagnetic interference cannot be ignored. .
[0016]
SUMMARY OF THE INVENTION In view of the above problems, the present invention provides an image quality compensator that eliminates the crossing portion and shortens the lead wire, enhances the emphasis performance of the contour portion, and reduces the size.
[0017]
[Means for Solving the Problems]
The present invention relates to an image quality adjusting apparatus comprising a speed modulation coil and a convergence magnet attached to an outer periphery of a neck portion of an inline type cathode ray tube, a cylindrical portion attached to the outer periphery of the neck portion of the cathode ray tube, and the cylindrical portion A velocity modulation coil attached to the cylindrical portion, a convergence magnet attached to the outer periphery of the cylindrical portion, a circuit for driving the cathode ray tube provided at a rear end portion of the neck portion of the cathode ray tube, and the velocity modulation A circuit board on which a circuit for supplying an auxiliary deflection current to the coil is formed, and a position on the rear end side of the neck part closer to the circuit board than a position where the convergence magnet is attached, A terminal for connecting the speed modulation coil to a circuit for supplying an auxiliary deflection current to the speed modulation coil; A circuit board on which a circuit for driving the cathode ray tube and a circuit for supplying an auxiliary deflection current to the velocity modulation coil are formed at the rear end of the neck portion of the cathode ray tube; and A terminal portion is connected by a lead wire so that the length of the lead wire for supplying the auxiliary deflection current to the speed modulation coil can be shortened from the circuit for supplying the auxiliary deflection current to the velocity modulation coil. to the octopus and features.
[0018]
In the present invention, since the terminal portion is provided on the rear end side of the neck portion with respect to the position where the convergence magnet is attached in the cylindrical portion to which the speed modulation coil is attached, the connection portion with the circuit board for driving the picture tube is provided. It can be shortened and the contour compensation characteristic can be improved.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments will be described with reference to the drawings.
FIG. 1 shows an example of an image quality compensation device according to the present invention. 1A is a front view, and FIG. 1B is a side view. In FIG. 1 (b), the left part is shown to the neck side of the cathode ray tube, and the right part is shown to the deflection yoke (DY) side. On the upper side, the lower side is described for explaining the winding portion of the coil, and does not indicate an absolute positional relationship. In addition, a terminal can be attached to the part shown by B in the figure.
[0020]
In FIG. 1, reference numeral 70 denotes a cylindrical portion, and FIG. 1 shows a winding portion and support portions 71 and 77 for winding a rectangular coil. Moreover, the terminal part 74 is shown so that the attachment position of the terminal which is the characteristic part of this application can be understood. In the figure, the hatched portion is the coil portion.
[0021]
A terminal portion 74 is provided at the rear end 72 of the cylindrical portion so that the connection lead to the circuit board can be shortened. Note 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 constitutes a negative terminal and the terminal 76 constitutes a positive terminal.
Further, the crossing portion which was another problem was removed by winding as shown in FIG. FIG. 2 shows the winding sequence.
[0022]
This will be described with reference to FIG.
A wire is drawn out from the terminal 76 and wound around the winding portion 71 to form a lower coil first. FIG. 2A shows a case where a wire 80 is wound around the winding portions 71 at the four corners to form a rectangular coil. The lower coil is wound in the order indicated by the arrows in the figure. Further, a winding 82 is applied to the upper winding portion 77, and a lead portion is connected to the other terminal 75 to constitute a speed modulation coil.
In order to easily understand the difference from the prior art, the crossing portion A is shown in FIG.
FIG. 3 shows an image quality compensator assembled by fitting a magnet assembly to the outer circumference of the cylinder of the speed modulation coil described with reference to FIGS.
[0023]
FIG. 3A is a front view, and FIG. 3B is a side view. In FIG. 3A, the left side portion is shown on the neck side, and the right side portion is shown on the deflection yoke (DY) side. 3A and 3B are examples of terminal attachment positions, and the terminal portion 74 may be attached anywhere as long as it is within the range indicated by the dotted line B in FIG.
[0024]
The convergence magnet 90 includes a pair of two-pole convergence magnets 91 for purity adjustment, a pair of four-pole convergence magnets 92 for side beam adjustment, and a pair of six-pole convergences for side beam adjustment. It consists of 93. A co-rotation prevention ring 94 is provided between the 2-pole convergence magnet 91 and the 4-pole convergence magnet 92, and the co-rotation prevention and convergence are provided between the 4-pole convergence magnet 92 and the 6-pole convergence magnet 93. In order to give rotational torque to the magnets 92 and 93, a spring-like ring 95 having an elastic force is provided. Further, in order to securely fix each magnet 90, a band 96 is provided, which is fastened by a fastening screw 97 and fixed to the neck portion of the cathode ray tube.
[0025]
FIG. 4 shows the image quality compensation device inserted and attached.
FIG. 4 shows an example in which a speed modulation coil is connected to an auxiliary deflection current generating circuit (not shown) on a circuit board 37 via a lead wire 30 connected to a metal terminal and a connector 32 provided at the tip thereof. is there.
[0026]
In the image quality compensator of the present invention, the terminal portion 74 is located behind the convergence magnet (speed modulation coil) 90 in the axial direction of the cylindrical portion, that is, on the rear end side of the neck portion opposite to the deflection coil 34 . Therefore, the connection lead wire 30 can be shortened. Further, the convergence magnet 90 can be brought close to the auxiliary deflection current generating circuit equivalently, and the performance can be improved.
[0027]
【The invention's effect】
As described above, according to the first aspect of the present invention, since the terminal is provided at the rear end portion of the neck, it can be connected to a substrate such as a CRT drive circuit with a short lead wire, and the direct current resistance loss is suppressed as much as possible. Is possible. Therefore, the contour compensation characteristic is improved and the reliability is improved.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an image quality compensation apparatus according to an embodiment of the present invention.
2 is a view showing a winding order of windings of the speed modulation coil in FIG. 1; FIG.
FIG. 3 is a view when a convergence magnet is attached to the velocity modulation coil of FIG. 1;
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 illustrating a conventional image quality compensation device.
FIG. 6 is a diagram illustrating 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.
8 is a view 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 (1)

An image quality adjusting device comprising a speed modulation coil and a convergence magnet attached to the outer periphery of a neck portion of an in-line type cathode ray tube,
A cylindrical portion attached to an outer periphery of the neck portion of the cathode ray tube;
A speed modulation coil attached to the cylindrical portion;
A convergence magnet attached to the outer periphery of the cylindrical portion;
A circuit board provided at a rear end portion of the neck portion of the cathode ray tube, on which a circuit for driving the cathode ray tube and a circuit for supplying an auxiliary deflection current to the velocity modulation coil are formed;
A circuit provided at a position on the rear end side of the neck portion closer to the circuit board than a position at which the convergence magnet is attached, and the speed modulation coil supplying an auxiliary deflection current to the speed modulation coil Bei example and a terminal portion to be connected to,
A circuit board on which a circuit for driving the cathode ray tube and a circuit for supplying an auxiliary deflection current to the speed modulation coil are formed at the rear end of the neck portion of the cathode ray tube, and the circuit board and the terminal A lead wire for supplying the auxiliary deflection current to the velocity modulation coil from a circuit for supplying the auxiliary deflection current to the velocity modulation coil. An image quality compensation device characterized by that.

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