JPS62166402A - Adjusting device - Google Patents

Abstract

PURPOSE:To remove the adverse influence of other signals such as noise, to improve adjustment accuracy and to shorten an adjustment time by generating an input signal intermittently during the manufacture of a circuit board. CONSTITUTION:The input signal A from an input signal generating means 21 and the signal B+C obtained by passing the signal A through a delay circuit 24 and an amplifier 25 are supplied to a mixer 23 to impress their sum signal D to a detection part 26. The detection part 26 samples and holds 32a the multiplication signal of the signals D and E obtained by a delay circuit 29 and a multiplier 27 through an LPF 31a and makes a gain adjustment by using its output signal. Further, the multiplication signal of the signals D and F which is obtained by a delay circuit 30 and a multiplier 28 is sampled and held 32b through an LPF 31b and a phase adjustment is made by using its output signal.

Description

[Detailed description of the invention] The present invention will be explained in the following order.

A. Field of industrial application B. Summary of the invention C. Prior art D. Problem to be solved by the invention E. Means for solving the problem (Fig. 1) F. Effect G. Overall configuration of the embodiment Gz adjustment device (Fig. Figure 2) Configuration of essential parts of 02ill adjustment device (Figure 1) G3 adjustment work H Effect of the invention A Industrial field of application The present invention automatically adjusts the circuit board during the manufacture of the circuit board, for example. The present invention relates to a circuit board adjustment device suitable for use in.

B. Summary of the Invention The present invention is a circuit board adjustment device suitable for use, for example, in automatically adjusting a circuit board when manufacturing the circuit board. The mixing means has a delay means for delaying the input signal from the generation means by a predetermined time and outputting the delayed signal, and a mixing means for mixing the output signal of the delay means and the input signal, and the mixing means is controlled by adjusting the delay means. Set the output signal to the specified value □
In the adjusting device, the input signal from the input signal generating means is intermittently generated so as to obtain a section in which the noise component generated when the output signal of the delay means is fed back to the input of the output signal of the mixing means is obtained. By doing so, the adverse effects of other signals such as noise during adjustment are eliminated, and adjustment accuracy can be improved and adjustment time can be shortened.

C. Prior Art Conventionally, as a circuit board adjusting device for automatically adjusting a circuit board, one disclosed in Japanese Patent Application Laid-Open No. 17503/1983 has been proposed. This adjustment device performs adjustment based on the inspection results, and is configured as shown in Figure 4. Under the control of the microcomputer system +11, a plurality of analog input signals are generated from the input signal generator group (2). . A predetermined signal from among the plurality of analog input signals generated by the input signal generator group (2) is selected by the input signal selector (3).

This input signal selector (3) is controlled by a microcomputer system (11) and makes the necessary adjustments.

An analog signal is selected for testing. This analog signal is sent to the board to be processed (13) via the pin jig (12).
supplied to If the board to be adjusted (13) includes a digital circuit, the digital input signal processing circuit group (
7) generates digital input signals for adjusting and inspecting multiple bits, and connects the pin jig (12) to the board to be adjusted (13).
).

In this way, analog signals and digital signals for adjustment inspection are supplied to the substrate to be adjusted (13) via the pin jig (12), so that the substrate to be adjusted (13) is connected to the pin jig (I2). A measurement output signal is taken out via.

The analog output signal from the substrate to be adjusted (13) is sent to the analog output signal processing circuit group (4) via the pin jig (12).
transmitted to. The conversion of the analog output signal to a DC output voltage proportional to the observed amount is performed by the analog output signal processing circuit group (
4). Analog output signal processing circuit group (
4) and the pin jig (12), and the contact pins of the pin jig (12) are directly connected to each circuit of the analog output signal processing circuit group (4). Therefore, the DC voltage output from the analog output signal processing circuit group (4) is always proportional to the observed amount at the observation point of the substrate to be adjusted (13).

A plurality of DC output voltages converted by the analog output signal processing circuit group (4) are supplied to an output signal switch (5), and one of them is selected. At this time, the analog output signal processing circuit group (4) has already converted the observed quantity into a DC voltage proportional to this, so the output signal switch +51
The DC output voltage selected by the output signal switcher (5), which does not cause transient phenomena in the analog processing circuit that occurs when switching observation points at high speed, is supplied to the A/D converter (6) and converted into a digital quantity. converted and read by a microcomputer system Tl).

If the board to be adjusted (13) has a digital circuit, the digital output signal from the board to be adjusted (13) is connected to the pin jig (
12), processed by a digital output signal processing circuit group (8), and read by a microcomputer system (11).

At the time of adjustment, the microcomputer system +11 is
The target value given in advance and the A/D converter (6
) to calculate the required amount of adjustment of the adjustment element from the difference between the observed value at a predetermined observation point digitized by And microcomputer system +
11 gives a command to a predetermined controller of the pulse motor controller group (9) to drive this necessary amount of adjustment with a pulse motor;
This allows adjustment at a predetermined alignment point. While the pulse motor is rotating according to the command of the microcomputer system (11), the microcomputer system (11) performs similar processing for adjusting the following points.

In this way, the microcomputer system (1)
Only commands are given to the pulse motor controller group (9), and the pulse motor controller group (9) controls the pulse motor group OI. However, since the processing speed of a microcomputer is sufficiently high compared to the response of a pulse motor, multiple motors are rotating at the same time, making it possible to make adjustments to multiple adjustment points at the same time. can.

While adjustments are being made in this way, other observation points can be inspected. The target value given to the microcomputer system (1) in advance and the observed value are compared, and inspection can be performed by comparing the values.

By controlling the inspection and adjustment using the microcomputer system (1) in this manner, inspection and adjustment at a plurality of locations can be easily performed.

By the way, as a circuit board for performing the adjustment as described above, there is a circuit board on which a comb-shaped filter used in video tape recorders and the like is constructed. This comb filter is
Generally, a delay circuit made of a glass delay line or the like is used, and a predetermined signal is obtained by processing a signal delayed by the delay circuit and a signal not delayed.

Then, the amount of delay of this delay circuit is adjusted by an adjustment device to achieve good signal processing.

D. Problems to be Solved by the Invention However, when adjusting the comb filter as described above, it is necessary to adjust the gain and phase so that they are optimal. Therefore, if the gain and phase are adjusted at the same time, it takes a long time to adjust them. In addition, when relatively low-cost components are used in a delay circuit such as a glass delay line, spurious signals are generated after the delay signal, and this spurious signal may affect the test signal. This resulted in a decrease in adjustment accuracy during gain adjustment. Furthermore, although an equalizer is built into the circuit that makes up the comb filter, the signal transmission time becomes uneven due to the presence of the equalizer, which also causes a decrease in adjustment accuracy. Ta.

In view of these points, it is an object of the present invention to provide an adjustment device that can improve adjustment accuracy and shorten adjustment time by eliminating the adverse effects of other signals such as noise components and components during adjustment.

E. Means for Solving the Problems The adjusting device of the present invention, as shown in FIG.
) delay means (24), (25) for outputting the delayed input signal by a predetermined time;
24), a mixing means (23) for mixing the output signal of (25) and the input signal, and a delay means (24),
(25), in which the output signal of the mixing means (23) is set to a predetermined value by adjusting the output signal of the mixing means (23), the delay means (24)
, (25) The input signal from the input signal generating means (21) is intermittently generated so as to obtain a section in which the noise component generated when the output signal is fed back to the input is not mixed.

F Effect According to the adjusting device of the present invention, the input signal from the input signal generating means (21) is generated intermittently, and the output signal of the mixing means (23) is delayed by the delay means (2, 4).

(25) By making it possible to obtain a section where the noise component force generated when the output signal is fed back to the input is not premixed, there is no adverse effect during adjustment due to other signals such as noise, improving adjustment accuracy and adjustment time. can be measured.

G. Example Hereinafter, an example of the adjusting device of the present invention will be described with reference to FIGS. 1 to 3.

91 Overall Configuration of Adjustment Apparatus The overall configuration of the adjustment apparatus of this example is as shown in FIG. 2. In FIG. 2, (22) indicates a circuit board for performing adjustment, and this circuit board 4 (22) is an NTSC system video circuit board for a video tape recorder or the like.

, ÷ circuit board (22) has a plurality of adjustment parts (24a), (
25a) is provided. Then, this circuit board (22
) as a component of the adjustment device of the microcomputer (
(hereinafter referred to as CPU) (35) and this CPU (35)
) and a data section (36) in which data can be transferred bidirectionally via a data bus line. This CPU (3
5) can supply a command signal to the pulse motor control section (37), and this command signal causes the pulse motor control section (37
) with multiple pulse motors (38a), (38
b) The specified pulse motor (38a
) etc. are driven to rotate. Each of these pulse motors (38
a) An adjusting part rotating means in the shape of a tool such as a screwdriver is attached to the tip of +-(38b).... Also, from the CPU (35) to the reference signal generator (21)
The reference signal generator (21) instructs the reference signal generator (21) to generate a reference signal, and supplies the reference signal to a predetermined location on the circuit board (22).

In addition, a detection unit (26) is connected to a predetermined location on the circuit board (22).
A reference signal is supplied to the circuit board (22) via a predetermined circuit. In addition to this detecting section (26), it has a plurality of similarly configured detecting sections <26'), etc., and receives detected signals from the respective detecting sections (26), (26'), etc. The signal is supplied to the signal selection section (39), and this signal selection section (3
In step 9), the detection signal from a predetermined detection unit (for example, the detection unit (26)) is converted into a digital signal by an analog-to-digital converter (A/D converter) (40), and then the CPU
(35).

Configuration of Main Parts of G2 Adjustment Device Next, the configuration of the adjustment device of this example from the reference signal generator (21) to the detection section (26) will be explained with reference to FIG. The configuration shown in Figure 1 consists of a video circuit board (2
This is for adjusting the components of the comb filter circuit (2). That is, a 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) can repeatedly oscillate and stop the reference signal at regular intervals. A reference signal is supplied from this input terminal (22a) to a mixer (23) and a delay circuit (24). The reference signal delayed by the delay circuit (24) is sent to the mixer (2) via the amplifier (25).
3). Here, the characteristics of the delay circuit (24) and one amplifier (25) can be adjusted by a variable capacitor (24a) and a variable resistor (25a), respectively. and,
The mixer (23) detects the sum of the reference signal supplied directly from the input terminal (22a) and the reference signal supplied via the delay circuit (24) and amplifier (25), and outputs this sum signal to the output terminal. (22b).

The sum signal obtained at this output terminal (22b) is transmitted to the first and second multipliers (27) and (28) in the detection section (26).
) is supplied to one of the multiplication signal input terminals. Further, the sum signal obtained at the output terminal (22b) is transferred to the first delay circuit (
29) to the other multiplication signal input terminal of the first multiplier (27), and this first 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 first multiplier (27) directly outputs the output terminal (22b
) is multiplied by the sum signal supplied via the first delay circuit (29), and the second multiplier (28
), the sum signal directly supplied from the output terminal (22b) is multiplied by the sum signal Z supplied via the first and second delay circuits (29) and (30). Then, the second multiplier (2
7) is applied to the first low-pass filter (31a) and the first sample-and-hold circuit (32a).
) is supplied to the gain adjustment detection signal output terminal (33). Further, the multiplied signal multiplied by the second multiplier (28) is supplied to the phase adjustment detection signal output terminal (34) via the second low-pass filter (31b) and the second sample-hold circuit (32b).

G3 Adjustment Work Next, the adjustment work for the circuit board (22) shown in FIG. 1 will be explained. 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 whose envelope waveform is shown in FIG. 3A.

That is, this reference signal repeatedly oscillates at approximately 3.58 MHz during a 2H scanning period (H is a horizontal period) and then stops the oscillation during a 2H scanning period. Then, the reference signal via the delay circuit (24) and amplifier (25) is transmitted to the third
As shown in FIG. B, the signal is delayed by the scanning period of <IH. For example, as shown in FIG. 3, the scanning period is I, U for each IH.
, II, IV, I..., the reference signal generator (21) changes during period 1.
If a signal of approximately 3.58 MHz is oscillated in II and the oscillation is stopped in periods ■ and ■, ideally the delayed reference signal via the delay circuit (24) and amplifier (25) will be approximately 3.58 MHz in periods n and m. 3
．． A 58MHz signal is oscillated, and the period 1. Stop oscillation with IV. However, in reality, the period 111. A spurious signal (3) (C in FIG. 3) is generated. This spurious signal is
This is a signal obtained by attenuating the reference signal. Therefore, the actual delay 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 a sum signal of this superimposed signal and the reference signal (FIG. 3A). As shown in Figure 3, this sum signal is output as it is in the period I, the reference signal shown in Figure 3A is output, and in the period ■, the reference signal shown in Figure 3A and the third
It is output as a sum signal (a signal with a slight amplitude in this example) with the delayed signal shown in Figure B, and in period ■, the delayed signal shown in Figure 3B and the spurious signal shown in Figure 3C are superimposed. In period (3), the spurious signal shown in FIG. 3C is output as is. In this way, a sum signal as shown in the third diagram is supplied from the output terminal (22b) to the detection section (26) side.

This sum signal is then supplied to one multiplication signal input terminal of each 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 a signal obtained by delaying the sum signal shown in the third diagram by the period of IH via the first delay circuit (29). (Figure 3E). For this reason, the first multiplication 1 (27
) is the sum signal shown in Figure 3 and the output signal shown in Figure 3 E.
The result is a multiplied signal with the IH delayed sum signal shown in FIG.
After C conversion, the signal is supplied to the first sample hold circuit (32a). This first sample and hold circuit (32a)
holds the multiplication signal of the period ■ and supplies it to the gain adjustment detection signal output terminal (33), and gain adjustment is performed using this signal. That is, the CP explained in the example of FIG.
Adjustment is performed by U (35) rotating (25a) this signal.

Since the signal obtained at this gain adjustment output terminal (33) is the signal shown in period ■ in Fig. 3 held, it is directly supplied to the multiplier (27) during this period ■. No spurious signal is superimposed on the sum signal of the reference signals (D in Figure 3), and the signal supplied from the first delay circuit (29) to the multiplier (27) (E in Figure 3) is only the reference signal. Therefore, the multiplication signal is not affected by the spurious signal, and gain adjustment is performed using a signal that is not affected by the spurious signal.

Further, the signal supplied to the other multiplication signal input terminal of the second multiplier (28) is a signal obtained by delaying the signal shown in FIG. 3E by the period of IH via the second delay circuit (30). (3rd
Figure F). Therefore, the multiplication output signal of the second multiplier (28) is the sum signal shown in Figure 3 and the 2 signal shown in Figure 3F.
It becomes a multiplied signal with the sum signal delayed by H, and this multiplied signal is DC-converted by the second low-pass filter (31b) and then supplied to the second sample-and-hold circuit (32b). This second sample and hold circuit (32b) holds the multiplied signal of the period (3) and supplies it to the phase adjustment detection signal output terminal (34), and phase adjustment is performed using this signal. That is, the adjustment parts (24
Adjustment is performed by rotating a) and (25a). Since the signal obtained at this phase adjustment output terminal (34) is the signal shown in period ■ in FIG. 3 held, it is directly supplied to the multiplier (28) during this period ■. The sum signal of the reference signals (Fig. 3D) is transmitted to the substrate (22
) is supplied from the second delay circuit VIK (30) to the multiplier (28) by only the delayed signal (including spurious signals) passing through the delay circuit (24) and amplifier (25) side. Since the signal shown in FIG. 3F is only the reference signal, the multiplication signal is transmitted through the delay circuit (24) on the board (22) and the amplifier (
25) side signal and the reference signal, so
The phase due to the delay state of the substrate (22) can be detected, and phase adjustment is performed.

Gain and phase adjustment is performed as described above, and in reality, both the gain-adjusted detection signal obtained at the output terminal (33) and the phase-adjusted detection signal obtained at the output terminal (34) by the CPU (35) A good adjustment is automatically made by judging the signals simultaneously. Gain adjustment and phase adjustment are performed by detecting the signals in periods ① and ① in Figure 3, respectively, so even if adjustments are made at the same time, the gain adjustment signal and the phase adjustment signal will not match. The signals are obtained by holding the signals of the optimum period individually, and there is no interference with each other, and both the gain and phase are adjusted in a short time. Further, since the signal for performing gain adjustment is a signal that does not contain spurious signals, good gain adjustment can be performed without the influence of spurious signals. Note that even if this spurious signal is included during phase adjustment, good adjustment is performed. Furthermore, by intermittently supplying the reference signal, the detection unit (26) directly mixes the mixer (23).
Since the signal supplied to the circuit and the signal supplied via the delay circuit (24) can be detected separately, even if the transmission time of the signal in the circuit during the adjustment period is uneven, it will not affect the adjustment accuracy. does not affect Furthermore, since the adjustment accuracy is not affected by the condition of the substrate to be adjusted, this adjustment device has high versatility, and the adjustment (maintenance) of the adjustment device itself does not require much effort.

The reference signal generator (21) repeatedly oscillates and stops every 2H in the above embodiment, but it may be set at an optimum interval at any time, such as every 4H when adjusting a PAL video circuit board. You can choose. However, in this case, it is necessary to change the delay amount, etc. of the first and second delay circuits (29) and (30). Furthermore, the present invention is not limited to the above-mentioned embodiments, and without departing from the gist of the present invention,
Of course, various other configurations are possible.

Effects of the Invention According to the adjusting device of the present invention, the input signal from the input signal generating means (21) is generated intermittently, and the output signal of the mixing means (23) is delayed by the delay means (24).

By making it possible to obtain a section in which the noise component generated when the output signal of (25) is fed back to the input is not mixed,
Eliminates the negative effects of other signals such as noise during adjustment.
There are benefits of improving adjustment accuracy and shortening adjustment time.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing the main parts of an embodiment of the adjustment device of the present invention, FIG. 2 is a configuration diagram showing the overall configuration of the example in FIG. 1, and FIG. 3 is a line diagram for explaining the example in FIG. 1. 4 are configuration diagrams showing a conventional circuit board adjusting device. (21) is a reference signal generator, (23) is a mixer, -(2
4) is a delay circuit, -(25) is an amplifier, and (26) is a detection section.

Claims (1)

[Scope of Claims] An input signal generating means; a delay means for delaying the input signal from the input signal generating means by a predetermined time and outputting the delayed signal;
In the adjusting device, the adjusting device has a mixing means for mixing the output signal of the delaying means and the input signal, and the output signal of the mixing means is set to a predetermined value by adjusting the delaying means. The input signal from the input signal generating means is intermittently generated so that a section is obtained in which a noise component generated when the output signal of the delaying means is fed back to the input of the mixing means is not mixed with the output signal of the mixing means. Characteristic adjustment device.