JPH06101665B2 - Adjusting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

A Industrial field B Outline of invention C Conventional technology D Problems to be solved by the invention E Means for solving problems (Fig. 1) F Action G Example G ₁ Overall configuration of adjusting device ( (Fig. 2) Configuration of essential parts of G ₂ adjusting device (Fig. 1) G ₃ adjusting work H Effect of the invention A Industrial field of application The present invention automatically adjusts the circuit board when manufacturing the circuit board, for example. Circuit board adjusting apparatus suitable for use in performing the same.

B. Summary of the Invention The present invention is a circuit board adjusting device suitable for use in automatically adjusting a circuit board, for example, at the time of manufacturing the circuit board. A signal is supplied from the means, and a signal obtained by mixing the signal delayed by the delay means of the circuit board and the signal not delayed by
In the adjusting device for setting a predetermined value, the input signal from the input signal generating means is intermittently supplied so that a section in which the noise signal generated by the output signal of the delay means being fed back to the input is not mixed with the output signal of the mixing means is obtained. By making the noise occur, the adverse effect of other signals such as noise at the time of adjustment is eliminated, and the adjustment accuracy can be improved and the adjustment time can be shortened.

C. Related Art Conventionally, as a circuit board adjusting device for automatically adjusting a circuit board, a device disclosed in Japanese Patent Laid-Open No. 60-17503 has been proposed. This adjusting device adjusts according to the result of the inspection, and is configured as shown in FIG. 4, and a plurality of analog input signals are input from the input signal generator group (2) by the control of the microcomputer system (1). Occur. A predetermined signal is selected by the input signal selector (3) from the plurality of analog input signals generated by the input signal generator group (2). The input signal selector (3) is controlled by the microcomputer system (1) and an analog signal for required adjustment and inspection is selected. This analog signal is transmitted via the pin jig (12) to the adjusted substrate (1
3) Supplied to. When the board to be adjusted (13) includes a digital circuit, a digital input signal for adjusting and inspecting a plurality of bits is generated from the digital input signal processing circuit group (7), and the board to be adjusted (13) Pin jig (1
2) Supplied via.

In this way, the analog signal and the digital signal for the adjustment inspection are supplied to the adjustment target board (13) through the pin jig (12), so that the adjustment target board (13) causes the pin jig (12). The measurement output signal is taken out via. The analog output signal from the adjusted board (13) is transmitted to the analog output signal processing circuit group (4) via the pin jig (12). The analog output signal processing circuit group (4) converts the analog output signal into a DC output voltage proportional to the observed amount. There is no switching circuit between the analog output signal processing circuit group (4) and the pin jig (12).
Contact pin and analog output signal processing circuit group (4)
Are directly connected to each circuit. Therefore, the DC voltage output from the analog output signal processing circuit group (4) is always proportional to the amount of observation at the observation point of the adjusted substrate (13).

The plurality of DC output voltages converted by the analog output signal processing circuit group (4) are supplied to the output signal switcher (5), and any one of them is selected. At this time, the analog output signal processing circuit group (4) has already converted the observed amount into a DC voltage proportional thereto, so that the output signal switch (5)
As a result, the transient phenomenon of the analog processing circuit that occurs when switching the observation points at high speed does not occur. The DC output voltage selected by the output signal switcher (5) is supplied to the A / D converter (6), converted into a digital amount, and read by the microcomputer system (1).

When the board to be adjusted (13) has a digital circuit, the digital output signal from the board to be adjusted (13) is the pin jig (12).
Is processed by the digital output signal processing circuit group (8) via the computer and read by the microcomputer system (1).

At the time of adjustment, the microcomputer system (1)
Target value given in advance and A / D converter (6)
The required adjustment amount of the adjustment element is calculated from the difference between the digitized observation value of the predetermined observation point (or the observation value of the predetermined observation point processed by the digital output signal processing circuit group (8)). Then, the microcomputer system (1) gives an instruction to drive the adjustment required amount by the pulse motor to a predetermined controller of the pulse motor controller group (9), and thereby a predetermined adjustment point is adjusted.
While the pulse motor is rotating by the command of the microcomputer system (1), the microcomputer system (1) performs the same processing for the adjustment of the next point. Thus, the microcomputer system (1)
Gives only an instruction to the pulse motor controller group (9), and the pulse motor controller group (9) controls the pulse motor group (10). However, since the processing speed of the microcomputer is sufficiently high compared to the response of the pulse motor, it becomes possible for multiple motors to rotate at the same time, and adjustments can be performed simultaneously for multiple adjustment points. it can.

While the adjustment is being performed in this way, inspections for other observation points can be performed. The target value previously given to the microcomputer system (1) and the observed value are compared, and the inspection can be performed by the comparison.

By thus controlling the inspection and adjustment by the microcomputer system (1), it is possible to easily perform the inspection and adjustment at a plurality of points.

By the way, as a circuit board which is adjusted as described above, there is a circuit board having a comb filter used in a video tape recorder or the like. This comb filter generally uses a delay circuit composed of a glass delay line or the like, and a predetermined signal is obtained by processing a signal delayed by this delay circuit and a signal not delayed. Then, the delay amount of this delay circuit is adjusted by the adjusting device, and good signal processing can be performed.

D The problem to be solved by the invention is that the adjustment of the comb filter as described above needs to be adjusted so that the gain and the phase are optimum. Therefore, if the gain and the phase are simultaneously adjusted, it takes a long time to adjust. Further, the delay circuit composed of a glass delay line or the like, when a relatively low-cost component is used, a spurious signal is generated behind the delayed signal, so this spurious signal affects the signal for inspection, This caused a decrease in adjustment accuracy during gain adjustment. Furthermore, even though an equalizer is incorporated in the circuit that constitutes the comb filter, the transmission time of the signal becomes non-uniform due to the presence of this equalizer, and in this case as well, the adjustment accuracy is reduced. It was

The present invention has been made in view of the above points, and an object thereof is to provide an adjusting device that can improve the adjustment accuracy and shorten the adjustment time by eliminating the adverse effects of other signals such as noise components during adjustment.

E Means for Solving Problems The adjusting device of the present invention is, for example, as shown in FIGS. 1 and 2, delay means (24), (25) for delaying an input signal by a predetermined time and outputting it. And this delay means (24), (25)
Mixing means (23) for mixing the output signal of the input signal and the input signal
By adjusting the delay means (24) and (25),
An adjusting device for adjusting a circuit board (22) capable of setting an output signal of a mixing means (23) to a predetermined value is based on a control means (35) for controlling an adjusting operation and a control from the control means (35). The input signal generating means (21) for supplying the input signal to the circuit board (22) and the adjusting means (37) for adjusting the delay means (24), (25) under the control of the control means (35). ), (38a), (38b) and a detection means (26) for detecting the output signal of the mixing means (23) and supplying the detection data to the control means, and inputting based on the control of the control means (35). The input signal generated from the signal generating means (21) is mixed with the output signal of the mixing means (23) and the output signals of the delay means (24) and (25) are fed back to the input to obtain a period in which a noise component is not mixed. As described above, it is generated intermittently.

According to the adjusting device of the present invention, the input signal from the input signal generating means (21) is intermittently generated so that the output signals of the mixing means (23) are output from the delay means (24) and (25). Since the section in which the noise components generated by the signal being fed back to the input are not mixed is obtained, the adverse effect at the time of adjustment by other signals such as noise can be eliminated, and the adjustment accuracy can be improved and the adjustment time can be shortened.

G Example Hereinafter, one example of the adjusting device of the present invention will be described with reference to FIGS.

Overall Configuration of G ₁ Adjusting Device The adjusting device of this example has an overall configuration as shown in FIG. In FIG. 2, (22) shows a circuit board for adjustment, and this circuit board (22) is an NTSC system video system circuit board such as a video tape recorder. The circuit board (22) is provided with a plurality of adjusting parts (24a) and (25a) composed of a variable resistor, a variable capacitance and the like which will be described later. A microcomputer (hereinafter referred to as CPU) (35) and this C are used as a component of the adjusting device of the circuit board (22).
It has a PU (35) and a data section (36) capable of bidirectionally transferring data by a data bus line. This CPU (3
A command signal can be supplied from the pulse motor control unit (37) to the pulse motor control unit (37), and the command signal causes the pulse motor control unit (37) to output a predetermined pulse among the plurality of pulse motors (38a), (38b), ... The motor (38a) etc. is driven to rotate. At the tip of each pulse motor (38a), (38b) ...
An adjusting component rotating means in the shape of a tool such as a screwdriver is attached. In addition, the reference signal generator (2
Instruct 1) to generate the reference signal, and set the reference signal generator (21).
Supplies a reference signal to a predetermined portion of the circuit board (22).
In addition, from the predetermined portion of the circuit board (22) to the detection unit (26),
A reference signal is supplied via a predetermined circuit in the circuit board (22). Further, in addition to the detection section (26), a plurality of detection sections (26 ') having the same configuration are provided, and each detection section (2
The detection signals from 6), (26 ') ...
9), and the detection signal from a predetermined detection section (for example, the detection section (26)) is supplied to the analog selection circuit (39) by the signal selection section (39).
The signal is converted into a digital signal by the digital converter (A / D converter) (40) and then supplied to the CPU (35).

Configuration of Main Part of G ₂ Adjustment Device Next, the configuration from the reference signal generator (21) to the detection unit (26) of the adjustment device of this example will be described with reference to FIG. The configuration shown in FIG. 1 is for adjusting the components of the comb filter circuit of the video system circuit board (22). That is, the reference signal is supplied from the reference signal generator (21) to the reference signal input terminal (22a) of the circuit board (22). This reference signal generator (21) repeats oscillation and stop of the reference signal at regular intervals. This input terminal (22
The reference signal is supplied from a) to the mixer (23) and the delay circuit (24). The reference signal delayed by the delay circuit (24) is supplied to the mixer (23) via the amplifier (25). Here, the characteristics of the delay circuit (24) and the amplifier (25) can be adjusted by the variable capacitor (24a) and the variable resistor (25a), respectively. Then, the mixer (23) detects the sum of the reference signal directly supplied from the input terminal (22a) and the reference signal supplied through the delay circuit (24) and the amplifier (25), and the sum signal is detected. Supply to the output terminal (22b). This output terminal (22
The sum signal obtained in b) is supplied to one multiplication signal input terminal of the first and second multipliers (27) and (28) in the detection section (26). Further, the sum signal obtained at the output terminal (22b) is passed through the first delay circuit (29) to the first multiplier (27).
Is supplied to the other multiplication signal input terminal of
The output signal of the delay circuit (29) is supplied to the other multiplication signal input terminal of the second multiplier (28) via the second delay circuit (30). Then, the sum signal directly supplied from the output terminal (22b) in the first multiplier (27) and the first delay circuit (29)
Is multiplied by the sum signal supplied through the second multiplier (28) and the sum signal supplied directly from the output terminal (22b) and the first and second delay circuits (29) and (30). Multiply with the sum signal supplied via. Then, the second multiplier (2
The multiplication signal multiplied by 7) is supplied to the gain adjustment detection signal output terminal (33) via the first low-pass filter (31a) and the first sample hold circuit (32a). In addition, the multiplication signal multiplied by the second multiplier (28) is
Through the low pass filter (31b) and the second sample and hold circuit (32b) of the phase adjustment detection signal output terminal (3
4) Supply to.

G ₃ Adjustment Work Next, the adjustment work of the circuit board (22) shown in FIG. 1 will be described. First, it is assumed that the reference signal generator (21) outputs a frequency signal of, for example, about 3.58 MHz as a reference signal, and this reference signal is, for example, a signal having an envelope waveform shown in FIG. 3A. That is, this reference signal is 2H (H
After oscillating a signal of about 3.58 MHz in the scanning period of the horizontal period), the oscillation of the scanning period of 2H is stopped.
The reference signal passed through the delay circuit (24) and the amplifier (25) becomes a signal delayed by the scanning period of 1H as shown in FIG. 3B. For example, as shown in FIG.
I, III, IV, I ...
When the reference signal generator (21) oscillates a signal of about 3.58 MHz in the periods I and II and stops the oscillation in the periods III and IV, ideally the delay circuit (24) and the amplifier (25) are used. The delayed reference signal oscillates a signal of about 3.58 MHz in periods II and III, and stops oscillation in periods I and IV. However, in reality, spurious signals (FIG. 3C) in periods III and IV delayed by 1H from the delayed reference signal in FIG. 3B are generated. This spurious signal is a signal in which the reference signal is attenuated. Therefore, the actual delayed reference signal is a signal in which the signal shown in FIG. 3B and the signal shown in FIG. 3C are superimposed. Then, in the mixer (23), the mixer (23) outputs the sum signal of the superimposed signal and the reference signal (FIG. 3A). As shown in FIG. 3D, the sum signal is the same as the reference signal shown in FIG. 3A during the period I, and the reference signal shown in FIG. 3A and the delayed signal shown in FIG. 3B are outputted during the period II. It is output as a sum signal (a signal having a slight amplitude in this example), and is output as a signal in which the delayed signal shown in FIG. 3B and the spurious signal shown in FIG. 3C are superimposed in period III. In period IV, the spurious signal shown in FIG. 3C is output as it is. In this way the third
The sum signal as shown in Fig. D is output from the output terminal (22b) to the detection section (2
6) Supplied to the side.

Then, this sum signal is supplied to one of the multiplication signal input terminals of the first and second multipliers (27) and (28).
The signal supplied to the other multiplication signal input terminal of the first multiplier (27) is obtained by delaying the sum signal shown in FIG. 3D for a period of 1H via the first delay circuit (29). It becomes a signal (Fig. 3E). Therefore, the multiplication output signal of the first multiplier (27) becomes a multiplication signal of the sum signal shown in FIG. 3D and the 1H delayed sum signal shown in FIG. 3E.
After being DC-converted by the low-pass filter (31a), the data is supplied to the first sample-hold circuit (32a). The first sample hold circuit (32a) holds the multiplication signal of the period II and supplies it to the gain adjustment detection signal output terminal (33), and the gain adjustment is performed by this signal. That is, while the CPU (35) described in the above-mentioned FIG. 2 example judges this signal, the CPU (35) controls the pulse motors (38a) and (38b), and the adjustment parts (24a) and (25a). ) Is adjusted by rotating. Then, the signal obtained at the output terminal (33) for gain adjustment is the period shown in FIG.
Since the signal indicated by II is held, the spurious signal is not superimposed on the sum signal (FIG. 3D) of the reference signal directly supplied to the multiplier (27) during this period II, and Since the signal (FIG. 3E) supplied from the delay circuit (29) to the multiplier (27) is only the reference signal, the multiplication signal is not affected by the spurious signal and is not affected by the spurious signal. Gain adjustment is performed on the signal.

The signal supplied to the other multiplication signal input terminal of the second multiplier (26) is a signal obtained by delaying the signal shown in FIG. 3E for a period of 1H through the second delay circuit (30). (Fig. 3F)
Becomes Therefore, the multiplication output signal of the second multiplier (28) becomes a multiplication signal of the sum signal shown in FIG. 3D and the 2H delayed sum signal shown in FIG. 3F, and this multiplication signal is used as the second multiplication signal. After the DC conversion by the low-pass filter (31b), it is supplied to the second sample hold circuit (32b). The second sample hold circuit (32b) holds the multiplication signal of the period III and supplies it to the phase adjustment detection signal output terminal (34), and the phase adjustment is performed by this signal. That is, the above-mentioned second
While the CPU (35) explained in the figure example judges this signal,
This CPU (35) enables pulse motors (38a) and (38b)
Is adjusted and the adjustment parts (24a) and (25a) are rotated to perform the adjustment. The signal obtained at the output terminal (34) for phase adjustment is the signal shown in the period III of FIG. 3 that has been held, and is therefore directly supplied to the multiplier (28) during this period III. Sum signal of reference signals (3rd
Figure D) shows the delay circuit (24) and the amplifier (25) on the substrate (22).
The signal (FIG. 3F) supplied from the second delay circuit (30) to the multiplier (28) is only the reference signal, and only the signal (including the spurious signal) delayed through the side. Therefore, since the multiplication signal becomes a signal of the state of the delay circuit (24) and the amplifier (25) side of the substrate (22) and the reference signal,
The phase due to the delay state of the substrate (22) can be detected, and the phase is adjusted.

The gain and phase are adjusted as described above. Actually, both the gain adjustment detection signal obtained at the output terminal (33) and the phase adjustment detection signal obtained at the output terminal (34) by the CPU (35). By simultaneously determining the signals of, the good adjustment is automatically performed. Since the gain adjustment and the phase adjustment are performed by detecting the signals of the periods II and III of FIG. 3, respectively, the gain adjustment signal and the phase adjustment signal are detected even if the adjustments are performed simultaneously. Becomes a signal obtained by holding a signal of an optimum period individually, and does not interfere with each other, and both gain and phase are adjusted in a short time. Further, since the signal for which the gain adjustment is performed does not include the spurious signal, there is no influence of the spurious signal, and the favorable gain adjustment is performed. It should be noted that at the time of phase adjustment, good adjustment is performed even if this spurious signal is included. Further, by intermittently supplying the reference signal, the signal supplied directly to the mixer (23) on the detection section (26) side and the signal supplied via the delay circuit (24) side are separated. Since it can be detected, even if the signal transmission time of the circuit during the adjustment period is not uniform, the adjustment accuracy is not affected. Furthermore, since the adjustment accuracy is not affected by the state of the substrate to be adjusted, this adjusting device has high versatility and does not require adjustment (maintenance) of the adjusting device itself.

The reference signal generator (21) repeatedly oscillates and stops every 2H in the above-mentioned embodiment. However, for example, every 4H when the PAL system video circuit board is adjusted, the optimum interval is maintained. Can be selected. However, in this case,
It is necessary to change the delay amounts of the first and second delay circuits (29) and (30). Furthermore, the present invention is not limited to the above-described embodiments, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

H According to the adjusting device of the present invention, the input signal from the input signal generating means (21) is generated intermittently, and the delay means (24), (25) are added to the output signal of the mixing means (23). By making it possible to obtain a section in which the noise component generated when the output signal of is fed back to the input is not mixed, the adverse effect at the time of adjustment by other signals such as noise is eliminated, and the adjustment accuracy can be improved and the adjustment time can be shortened. Have a profit

[Brief description of drawings]

FIG. 1 is a block diagram showing a main part of an embodiment of an adjusting apparatus of the present invention, FIG. 2 is a block diagram showing the overall structure of the example of FIG. 1, and FIG. 3 is a line used for explaining the example of FIG. FIG. 4 and FIG. 4 are configuration diagrams showing a conventional circuit board adjusting device. (21) is a reference signal generator, (23) is a mixer, (24) is a delay circuit, (25) is an amplifier, and (26) is a detector.

Claims (1)

[Claims] 1. A delay means for delaying and outputting an input signal by a predetermined time, and a mixing means for mixing an output signal of the delay means and the input signal, and adjusting the delay means. In an adjusting device for adjusting a circuit board capable of setting an output signal of the mixing means to a predetermined value, control means for controlling the adjusting operation, and supplying the input signal to the circuit board under the control of the control means. Input signal generating means, adjusting means for adjusting the delay means based on control from the control means, and detection means for detecting the output signal of the mixing means and supplying detection data to the control means are provided, Based on the control of the control means, the input signal generated from the input signal generating means is a noise component generated by the output signal of the mixing means being fed back to the output signal of the delay means. As free period if is obtained, the adjusting device being characterized in that so as to intermittently generate.