JPH0754663B2 - Coil coupling degree automatic adjustment device - Google Patents

Description

The present invention relates to a manufacturing process of a coil device in which a pair of coils are combined with each other, such as a deflection yoke for a television having a vertical coil and a horizontal coil. In this regard, the present invention relates to a device for automatically performing relative positioning of a pair of coils.

[Conventional technology]

As shown in FIG. 7, the television deflection yoke has an annular ferrite core (71) fitted on the outer periphery of a megaphone-shaped coil separator (72) and a coil separator (72).
A horizontal coil (70) is provided on the inner peripheral surface of the, and a vertical coil (7) is wound around the ferrite core (71).
Both coils (7) and (70) deflect the electron beam emitted from the electron gun in the horizontal direction or the vertical direction by the exciting current signal inputted through the terminal (73).

In the deflection yoke, it is necessary to prevent the mutual interference by making the degree of electromagnetic induction coupling between the coils (7) and (70) as close to zero as possible. Originally, both coils (7) and (70) were assembled at a relative position where the degree of electromagnetic inductive coupling between them was substantially the minimum value, but more accurate positioning is required to improve the performance of the deflection yoke. Therefore, conventionally, the ferrite core (71) is fitted to the coil separator (72) with some play in the rotation direction (the direction of the arrow in FIG. 7), and the phase of the vertical coil (7) with respect to the horizontal coil (70) is adjusted. Fine adjustment of the angle is performed.

That is, as shown in FIG. 9, a power source (22) for generating a sine wave signal is connected to one coil (70) and an electromagnetic induction electromotive force detection means (23) such as an oscilloscope is connected to the other coil (7). , And observe the change in the induced voltage due to the rotational movement of the ferrite core (71), and fix both coils at the position where the induced voltage becomes the minimum value.

A crosstalk value x shown below is used as an index representing the degree of electromagnetic inductive coupling of both coils (7) and (70).

Here, V ₁ : primary voltage input to one coil (70) V ₂ : secondary voltage output from the other coil (7) As shown in FIG. 8, the horizontal coil (70) is fixed. By rotating the vertical coil (7), the degree of electromagnetic inductive coupling of both coils changes, and the crosstalk value x increases or decreases.

In FIG. 6, the horizontal axis represents the mutual phase angle θ (degrees) of both coils,
The ordinate represents the crosstalk value x and qualitatively represents the change in the degree of electromagnetic inductive coupling. Crosstalk value x
Indicates a characteristic change close to a quadratic curve which is convex downward, and has a minimum value x ₀ at a certain phase angle θ ₀ (approximately 90 degrees). Hereinafter, regarding the phase angle θ _{0 at} this time, the crosstalk value x _{0 is referred} to as a dip point.

In the deflection yoke, a vertical coil (7) and a horizontal coil (7)
It is necessary to fix 0) and at the dip point. However, as shown in FIG. 6, the reaction of the crosstalk value x near the dip point x ₀ is insensitive to the change of θ, and it is extremely delicate to accurately position both coils at the dip point. Adjustment operation is required.

Conventionally, a skilled adjustment worker rotates the ferrite core (71) with a delicate touch while looking at the oscilloscope screen to perform the above adjustment work.

[Problems to be solved by the invention]

A high degree of skill is required to quickly perform the above adjustment work, and the operator is physically and mentally heavily burdened.
Further, since the adjustment is manual, not only the adjustment accuracy has a limit, but also there are many variations in the adjustment value, which hinders the performance improvement of the deflection yoke.

[Means for solving problems]

The present invention provides an automatic coil coupling degree adjusting device capable of automatically adjusting the position of a coil device including a pair of coils (7) and (70) to a dip point.

An automatic coil coupling degree adjusting device of the present invention holds a coil device as shown in FIG. 1 and changes a relative position of a pair of coils (7) and (70) according to a control signal (1).
And the primary voltage V ₁ is input to one coil (7) and the secondary voltage V ₂ output from the other coil (70) is detected, and the electromagnetic induction coupling of the pair of coils (7) (70) is detected. as degrees, and means for detecting the logarithm, or a value proportional to the pair value of the secondary voltage ratio of V ₂ to the primary voltage _{V 1 (V 2 / V 1} ) (2), detected by the detecting means By detecting the change in the degree of electromagnetic inductive coupling, the relative position of both coils (7) (70) that minimizes the degree of electromagnetic inductive coupling is searched, and the magnitude of the degree of electromagnetic inductive coupling detected in the search process is searched. The search step width is variably set according to the degree, and the calculation processing means (3) for setting a minute step width when the degree of electromagnetic inductive coupling is smaller than a predetermined value, and the calculation processing for the drive mechanism (1). When the drive control signal according to the search step width set by the means (3) is created To, and from a control means for generating a stop control signal allowed to stop the drive mechanism (1) when the electromagnetic induction coupling degree is closest to the minimum value (4).

[Action]

When an unadjusted coil device is attached to the coil coupling degree automatic adjusting device and a start command for adjusting operation is given, the detecting means (2) detects the coupling degree (for example, crosstalk value x) of the pair of coils (7) and (70). The measurement is started, and at the same time, the drive mechanism (1) operates to finely move one coil (7) with respect to the other coil (70) in one arbitrary direction.

The arithmetic processing means (3) first detects the change in the coupling degree at this time, and determines the coil movement adjustment direction for minimizing the coil coupling degree.

The control means (4) issues a drive control signal to the drive mechanism (1) in order to move the coil (7) in the adjustment direction found by the arithmetic processing means (3).

As a result, the drive mechanism (1) is gradually moved to both coils (7).
The relative position of (70) is changed, and the coupling degree of the coil goes to the minimum value.

In this process, the detection means (2) continuously or at a constant sampling period measures the coupling degree, and the arithmetic processing means (3) constantly monitors the variation of the coupling degree. Then, the arithmetic processing means (3) variably sets the relative positions to be set in the coils (7) and (70) with a search step width according to the magnitude of the degree of electromagnetic inductive coupling, and at the same time, performs electromagnetic control in each step. Based on the degree of inductive coupling, both coils that minimize electromagnetic inductive coupling (7) (7
The relative position of 0) is searched, and in the search process, a large step width is set when the electromagnetic inductive coupling degree is larger than a predetermined value, and a small step width is set when the electromagnetic induction coupling degree is smaller than the predetermined value.

As a result, the search procedure proceeds rapidly during a period in which the relative positions of the coils are greatly deviated from the optimum position, and after the relative positions of the coils have approached the optimum position, a highly accurate search is performed.

When the degree of coupling reaches the minimum value, the amount of change in the degree of coupling once becomes zero, and thereafter changes in the opposite direction to the direction of change until reaching zero. The arithmetic processing means (3) detects a time point when the degree of change in coupling degree becomes zero, and at this time, the control means (4) creates a stop control signal in accordance with a command from the arithmetic processing means (3) and drives the driving mechanism (1). ) Is stopped. As a result, the coil system is accurately positioned at the minimum degree of coupling.

The drive mechanism (1) can be easily manufactured by using a stepping motor as a power source, for example, for highly accurate position control.

As the detecting means (1), for example, the conventional one shown in FIG. 9 can be used.

Further, the arithmetic processing means (3) and the control means (4) can be composed of, for example, a microcomputer in which a program for automatically and accurately searching for the minimum value of the coupling degree is written.

〔The invention's effect〕

According to the automatic coil coupling degree adjusting device of the present invention, the electromagnetic induction coupling degree of the coil device can be automatically and highly accurately adjusted. Therefore, not only is the burden on the adjustment operator eliminated, but the performance of the coil device is improved.

〔Example〕

FIG. 1 is a block diagram showing the entire configuration of an automatic coil coupling degree adjusting device according to the present invention. FIGS. 2 to 5 show an example in which the device is applied to a crosstalk adjusting device for a deflection yoke. ing.

The drive mechanism (1) has a deflection yoke (74) as shown in FIG.
And a plurality of clamp pieces (11) for fixing the deflection yoke (74) on the base (13) by pressing down the coil separator (72) of the deflection yoke (74). , A pair of adjusting pieces (12) (12) for pressing and rotating the ferrite core (71) of the deflection yoke (74).
2) and (12) are provided facing each other on a reciprocating device (16) mounted on the upper end of a main shaft (15) whose rotation is controlled in the forward and reverse directions by a stepping motor (10).
Can be moved closer to or separated from the main shaft, and can be rotated together with the main shaft by driving the stepping motor (10).

Further, a terminal device (20) having a plurality of pins capable of coming into contact with or detaching from each of the coil terminals is arranged so as to face the deflection yoke (74) mounted on the base (13). ing.

A positioning plate (14) having a slit hole (19) in the center is projected from the lower end of the main shaft (15).
A photocoupler composed of a light source section (17) and a light receiving section (18) is arranged so as to sandwich the light source section (4). The positioning plate (14) rotates integrally with the main shaft (15), but when the slit hole (19) is aligned with the optical path of the photocoupler, the adjusting pieces (12) (1
The positional relationship of each part is determined so that 2) faces the part of the deflection yoke (74) where the coil of the ferrite core (71) is not wound.

The coil coupling degree detecting means (2) includes a sine wave signal generating section (21) connected to the horizontal coil (70) as shown in FIG.
An amplifier (20) connected to the vertical coil (7), a signal generator (21), an AD converter (36) interposed between the amplifier (20) and the microcomputer (30), and a microcomputer. And a crosstalk calculation program executed by (30).

The amplifier (20) can switch the amplification degree (gain) between two stages of H mode and L mode in response to a command from the microcomputer (30), and the level of the induced voltage from the vertical coil (7) is high. At this time, the amplifier is set to the small L mode, and when the induced voltage level is low, the amplification is set to the large H mode.

The signal generator (21) supplies a sine wave signal having a frequency of 1575 KHz and a total amplitude voltage of 10 V to the horizontal coil (70).

The arithmetic processing means (3) and the control means (4) are constituted by a microcomputer (30) in which the dip point automatic adjustment program shown in FIGS. 4 and 5 is written.

The input / output port (32) of the microcomputer (30) is connected with the data setting device (6) and the display unit (5) through the interface (34) and the mode display panel (51). There is.

The display unit (5) digitally displays the adjusted crosstalk value x ₀ . The data-setting device (6) rotates the stepping motor (10) of the drive mechanism (1) at a normal speed and the crosstalk value x _{2 which} is a criterion for switching the gain of the amplifier (20) as described later. The number of unit pulses at the time of pressing and the mechanical backlash of the drive mechanism (1) are set respectively.

The mode display panel (51) displays in which operation mode the automatic coil coupling degree adjusting device is in operation.

Also, the input / output port (33) of the microcomputer (30)
The manual controls (6) via the interface (35).
0), the limit switch group (37), and the stepping motor (10) are connected.

The manual operation device (60) includes an automatic / manual switch for operating the automatic coil coupling degree adjusting device in the manual mode, and an operation button for manually operating the stepping motor (10). There is.

The limit switch group (37) includes a movable part of the drive mechanism (1), that is, a clamp piece (1) for sequence control of the drive mechanism (1).
1), the adjustment piece (12), etc. are provided at the moving ends, respectively.

Hereinafter, the operation of the automatic coil coupling degree adjusting device will be described in detail with reference to FIGS. 4 and 5.

FIG. 4 is a flow chart showing the entire dip point automatic adjustment program written in the RAM of the microcomputer (30), and FIG. 5 shows the details of the “coupling degree minimum position detection routine” in the flow chart. .

The apparatus is powered on, and various data is initialized (8) by the data setter (6). At this time, the amplifier (2
The gain of 0) is set to the L mode, that is, a relatively low level of amplification.

When the deflection yoke (74) is set on the drive mechanism (1),
The clamp piece (11) operates to clamp the coil separator (72) on the base (13). Next, the stepping motor (10) operates to rotate the main shaft (15), and the light of the light source part (17) of the photocoupler passes through the slit hole (19) of the positioning plate (14) and the light receiving part (18). Set the rotation angle of the spindle (15) at the position that reached. As a result, the pair of adjusting pieces (12) (12) are positioned (80) so as to face the portion of the deflection yoke (74) where the coil of the ferrite core (71) is not wound. Then, adjust pieces (12) (1
2) are driven toward each other and the ferrite pieces (7
1) is held by the adjusting pieces (12) (12).

Next, it is determined whether the device is in manual mode or automatic mode. When in manual mode, the manual mode lamp on the mode display panel (51) lights up (81),
Until the manual mode is released, the manual routine (82) for operating the device according to the operation of the manual operation device (60) is executed.

On the other hand, when the device is in the automatic mode, the automatic mode lamp is turned on (83) and the system waits for the input of the start signal for shifting to the automatic adjustment.

When the start button is pressed and a start signal is input, the terminal device (20) operates and the pin (21) moves to the deflection yoke (74).
Are pressed into contact with the terminals (73). As a result, the deflection yoke (74) and the coil coupling degree automatic adjusting device are electrically connected.

First, a connection is made so as to connect both coils (7) and (70) in series, and the continuity check of the coils is performed. If the continuity check fails, wait for 1 second (84)
The NG lamp lights up, and the next deflection yoke is adjusted.

When the continuity check is passed, the GO lamp lights up (85),
A coupling degree minimum position detection routine (9) described below is executed to adjust the deflection yoke.

When the adjustment is completed, the coupling degree (crosstalk value x) at the final position is displayed and the final pass / fail lamp is turned on.

After that, the drive mechanism (1) operates to release the holding of the deflection yoke (74), and resets (86) each movable part to the start position.

Further, the stepping motor (10) operates to position (87) the adjusting pieces (12) (12) in preparation for the next adjustment of the deflection yoke.

The above operation completes the adjustment of one deflection yoke. The following deflection yoke is set in the drive mechanism (1),
Adjustment is performed by the same operation as above.

In the coupling degree minimum position detection routine (9), as shown in FIG. 5, first, the stepping motor (10) is slightly rotated by the input of a certain amount of drive pulse, and the vertical coil (7) is moved.
Initial feed (90) in the CW direction (clockwise). This is to absorb the backlash (play) of the deflection yoke (74) and the drive mechanism (1) and improve the accuracy of the subsequent adjustment.

For example, in FIG. 6, when the state before the adjustment is indicated by the point a, it is assumed that the point b has been moved to the point b by the initial feed.

Next, the crosstalk value x at that time is H of the amplifier (20).
It is determined whether it is in the mode area or the L mode area. The crosstalk value x ₂ that serves as a criterion for this judgment is preset by the data setter (6). If it is in the H mode area, the stepping motor (10) rotates in the reverse direction and the vertical coil (7) feeds at high speed in the CCW direction (counterclockwise direction) (9
1) and returned to the L mode area. As a result, the adjustment is always started from the L mode area. this is,
This is because if the crosstalk value x is close to the dip point x ₀ from the beginning of the adjustment, the SN ratio of the detection circuit deteriorates, and as a result the adjustment reliability decreases.

A constant amount of drive pulse in the positive direction is sent to the stepping motor (10), and the vertical coil (7) is constantly sent (92) in the CW direction. For example, suppose that this causes the crosstalk shown in FIG. 6 to shift from point b to point c.

The microcomputer (30) calculates the change in the crosstalk value x at this time and determines whether x has increased or decreased. When the crosstalk value x decreases (point b → c
At (point), it is judged (93) whether or not there is a level difference above a certain level in the change amount of the crosstalk value at this time. This is a step for checking whether or not noise influences the change from point b to point c. When noise occurs, the level difference at this time is often smaller than a fixed value, and at this time, the process returns to step (92). If the level difference exceeds a certain value, it is determined that the dip point x ₀ exists in the CW direction.

On the other hand, when the crosstalk value x increases, for example, as shown by the arrow from b ′ to c ′ in FIG. 6, the phase angle θ of the deflection yoke at the beginning of the adjusting head is smaller than the phase angle θ _{0 at the} dip point. Also means that the dip point x ₀ exists in the CCW direction after it is confirmed that there is a level difference of a certain level or more in the crosstalk value.

Next, it is determined whether or not the crosstalk value x at point c is in the fast-forward mode region. The crosstalk value x ₁ (x ₁ <x ₂ ) which is the criterion for this judgment is preset by the data setter (6). If x> x ₁ , fast forward (95) is performed toward the dip point. As a result, it is assumed that the point has moved to the point d where x <x ₁ . At this time, it is judged that the fast-forward is unnecessary, and after the gain of the amplifier (20) is set to the H mode, the necessity of the fast-forward is judged again. When it is determined that the fast-forward is necessary, the fast-forward (97) is performed at a speed higher than the fast-forward (95).

When it is determined that the fast feed is unnecessary, the feed is switched to the fine feed (98) in order to improve the adjustment accuracy, and the vertical coil (7) is rotationally driven by a fine amount toward the dip point.

At this time, it is determined whether the crosstalk x has increased. Crosstalk value from point d to dip point (θ ₀ , x ₀ )
The minute feed (98) is repeated while moving toward, that is, while x decreases.

As a result, the crosstalk value x finally reaches the point f closest to the dip point. After that, the minute feed (9
When 8) is applied, the dip point is passed by a minute amount, but the microcomputer (30) detects an increase in the crosstalk value at this time and the adjustment slightly passes the dip point. Detect that.

Next, it is judged (99) whether or not the increase in the crosstalk value is caused by the generation of noise. That is, after a minute time has elapsed, the crosstalk value at the point e is calculated again and compared with the crosstalk value at the point f. When the increase in the crosstalk value is caused by the generation of noise, the noise level is often lowered at the time of the second judgment, and therefore, the crossing is performed in the process from the point d to the point f. The talk value will decrease. If the crosstalk value also increases during the second determination, it is determined that the crossing value has truly passed the dip point (θ ₀ , x ₀ ), and the rotation of the stepping motor (10) is temporarily stopped.

Finally, the stepping motor is rotated by the minute feed amount in a direction opposite to the direction of rotation when moving from point f to point e, and the final adjustment position is returned to point f. At this time, the rotation angle of the stepping motor is corrected by the amount of backlash that the deflection yoke (74) and the drive mechanism (1) have. The correction amount is previously input by the data setting device (6).

By the above operation, the vertical coil (7) and the horizontal coil (70) forming the deflection yoke (74) are positioned with high precision at the dip point.

For example, in the conventional manual adjustment, the crosstalk value x is
Although the limit was set to 60 dB, according to the coil coupling degree automatic adjusting device of the present invention, it is possible to reduce the final crosstalk adjustment value to −75 to −80 dB. Can be said to be extremely close to the dip point.

The coil coupling degree automatic adjusting device according to the present invention is not limited to the illustrated embodiment, and it is needless to say that various modifications can be made within the technical scope described in the claims.

[Brief description of drawings]

FIG. 1 is a block diagram showing the overall configuration of an automatic coil coupling degree adjusting device of the present invention, FIG. 2 is a perspective view of a drive mechanism, and FIG.
FIG. 4 is a block diagram showing an electric circuit of an automatic coil coupling degree adjusting device, FIGS. 4 and 5 are flow charts showing the operation of a microcomputer, and FIG. 6 is a graph showing changes in the electromagnetic induction coupling degree of the coil device. 7 is a partially cutaway side view of the deflection yoke, FIG. 8 is a front view showing the positional relationship between the vertical coil and the horizontal coil, and FIG. 9 is an electric circuit diagram for detecting the degree of coil coupling. (1) ... Drive mechanism, (2) ... Coupling degree detecting means (3) ... Arithmetic processing means, (4) ... Control means (7) ... Vertical coil, (70) ... Horizontal coil

Claims (1)

[Claims] 1. A device for minimizing the degree of electromagnetic inductive coupling between coils of a coil device comprising a pair of coils (7) (70) which are to constitute a deflection yoke and are capable of adjusting their relative positions. Drive mechanism (1) for holding relative temperature and changing the relative position of the pair of coils (7) (70) in accordance with a control signal
And input the primary voltage V ₁ to one coil (70) and detect the secondary voltage V ₂ output from the other coil (7),
Electromagnetic induction as the degree of coupling, the logarithm of the ratio of the secondary voltage V ₂ for the primary voltage V ₁ (V ₂ / V ₁₎ of the pair of coils (7) (70),
Alternatively, the means (2) for detecting a value proportional to the logarithmic value, the degree of electromagnetic inductive coupling detected by the detecting means as an evaluation function, and the relative position of both coils (7) (70) as variables are used as variables. The procedure for searching the relative position of both coils (7) (70) where the degree is the minimum is executed, and in the searching process, the search step width is variably set according to the magnitude of the detected electromagnetic inductive coupling degree, An arithmetic processing means (3) for setting a minute step width when the degree of electromagnetic inductive coupling is smaller than a predetermined value, and a search step width set by the arithmetic processing means (3) for the drive mechanism (1). And a control means (4) for generating a stop control signal for stopping the drive mechanism (1) when the degree of electromagnetic inductive coupling comes closest to the minimum value. Characteristic coil coupling degree Dynamic adjustment device.