JPS5961703A - Optical type measuring circuit for maximum width - Google Patents

Abstract

PURPOSE:To prevent the disturbance of signal waveform due to length of wiring by accent the waveform at the end of the image of an object to be measured in a video signal from an image sensor so that it is transmitted to a discriminator section as binary-code video signal of a low frequency. CONSTITUTION:When an amplified video signal VQ' in which a video signal outputted at the end of an object 2 to be measured is accent at the end thereof is outputted and inputted into comparator 14 and 15, it is set at a lower threshold l1 and a higher threshold l2 than the normal amplified video signal and a binary-coded video signals CK(A) and CK(B) are outputted to a latch control section 16. The arithmetic section 20 can calculates a measured value by subtracting the number of clocks DC from the start signal S to the initial end from the number of clocks DD from the start signal S to the final end. The calculation is done each time the final end value latch signal L4 is outputted and as a result of the computation, a data DS is inputted into a data comparison section 11 and the maximum value DM thereof is latched with a maximum value latch 10 to be indicated on a display section 12. This can prevent disturbance of the signal waveform due to the length of the wiring and hindrance by noise or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a maximum width optical measuring circuit that optically measures the maximum width of a disk or the like using an image sensor.

Conventionally, a circuit as shown in Fig. 1 has been used as an optical measuring circuit to measure the entire outer diameter of a disk, etc. using a light receiving plate with a large number of pixels such as a solid-state image sensor, or an image pickup tube such as a vidicon. There is something.

That is, in FIGS. 1, 2, and 3, a cover 6 such as a disk is placed in parallel in front of the light-receiving surface of the image sensor 1.
111 A light emitting unit 3 that projects light onto the light receiving surface of the image sensor 1 is arranged outside the footwear 2 to form a sensor unit T. The image sensor 1 includes a control unit 4.
A clock pulse φ based on the oscillation frequency of the oscillation circuit 5 and a start signal S for starting pixel sampling are input from the oscillation circuit 5 . The video output signal from the image sensor 1 is output as a Huff width video signal VQ by the amplifier 6, and is input to the down counter 8 as a binary video signal C by the comparator 7. The number of pixels of the image sensor 1 that is exposed to light without being blocked by the fixed object 2 is subtracted from the down counter 8 preset by the start signal S, and every time zumbling is completed, a fixed value d(11) is latched, and the limit value 1 is Sound 1≦4 to 41111 >1
fllll 5if for data is input to value latch 9, and measurement data D is held. Note that in the WJz diagram, the mouth is connected to the input of the object to be measured (disc) input signal ST, and the launch 9,
10. Reset the display section 12. S is the sampling link start signal and the sampling signal 5n(n
= J, 2.3...), φ is a clock pulse signal, VQFi amplified video signal, CK is a constant bell l
. (FIG. 3) shows the sliced binary video signal, and L) shows the measured latch signal, and L) shows the measured data, and data on corresponds to the first sampling signal Sn.

L is a maximum value latch signal, and 0M is maximum value data.

The maximum value latch 10 cooperates with the data comparison tls11 to hold the six measured data signals υM (maximum value data).

If the constant data is larger than the maximum measurement data up to now, the maximum value launch lO is always set to the maximum value latch signal L2 from the data comparator 11 to make the measurement data the maximum measurement data. Value data DM is held. (Indicated by B in FIG. 2.) At the timing indicated by C in FIG. 2, the reset signal R is sent to the control unit 4. Lateral Sacro Latch9. The maximum value latch 101 is added to the display section 12 to reset these values before the object to be measured 2 enters the front surface of the image sensor 1.

In this way, the clock pulse signal φ of the down counter 8 is preset to the video signal from the image sensor l.
use. That is, the amplified video signal VCI output from the amplifier 6 is converted into a binary video signal GK by the comparator 7.
The down counter 8 is counted down by the input signal ST of the object to be measured 2 from the control section 4, and the reset signal date is outputted by the clock from the oscillation circuit 5. The latch signal RI is output and the maximum value data [J
By multiplying M by a certain constant, it is converted into an actual length and displayed.

FIG. 4 U) shows the relationship between the disc-shaped object 2, the image sensor l, and the kite q.
move. FIG. 4(B) is a diagram showing a state in which pixels are scanned on the object to be measured 2 using the sambling signal Sn (n=1+2+3...), and when sampling signal S3 is used, data u3 (FIG. 2) is the maximum.

In such a conventional maximum width optical measuring circuit, if there is a hole in the object to be measured, such as a six-point power-of-one circular cylinder, the video signal is output at the hole, so a down counter is redundant. Because the total diameter is ri9, it is smaller than the actual diameter (
shown.

Also, the sensor section formed by the image sensor, amplifier, comparator (7I7) and the judgment section formed from the counter, latch, data ratio section, etc. are separated by S.
v! The shortcomings are that the high-speed signal that is the same as the clock pulse from the sensor is transmitted, and the long wiring causes the waveform to become sloppy and that noise is easily mixed in, causing discrepancies in the measured values. was there.

The present invention was made in view of the above points, and uses an end forced signal that emphasizes the amplitude and time of the video signal at the beginning and end of the object to be measured, and changes the signal network wave number to a low frequency. By doing so, it is possible to prevent problems caused by the length of the wiring between the sensor section and the judgment section.

Furthermore, by using a latch control unit to stop the detection signal for the beginning end once the end is detected, we have created the widest optical measurement circuit that eliminates measurement errors caused by holes in the object to be measured. The purpose is to provide

Hereinafter, one embodiment of the present invention will be explained in detail with reference to FIGS. 5, 6, 7, and 8.

In Figure 5, the same parts as in Figure 1 are designated by the same reference numerals.]
Some explanations will be omitted. The amplifier 13 is AC-coupled (AC-coupled) with the output side of the image sensor 1, and outputs the edge sound intensity 'P' of the video m output at the edge of the object to be measured 2.
J! A (swing 1 and time 1 corner full training) Shida increase 1vr,
A video signal VQ' (see FIG. 6) is output. This j
VtlI? Ti bidet, +Iq No.VQ' is comparator 1
4 is input to the comparator 15. Comparator 14
is set to a threshold level l, which is lower than the amplified video signal of the nth time below the edge, and 2 to the timing of the initial edge.
Value conversion video I M”5 (/Latch (A) to control unit 1
Output to 6. Similarly, the comparator 15 is set to a high threshold level l, and the terminal timing 8 is set to 2.
The digitized video signal CK (8) is output to the latch control VA516.

Up counter +7tJ: It is reset by the sampling start signal S from the control section 4, and counts all the clock pulses φ from the position of the start signal S to the first end of the object to be measured 2.

The first end fIR latch 18 is reset by the start signal S and holds the number of clock pulses (data of the up counter 17) from the start signal S to timing 8 at the first end.

Similarly, the latch 19 holds the number of clock pulses from the start signal S to the timing B at the end. Latch control unit 16 end signal CK (A),
Initial value latch signal L3° and final value latch signal L4 f: are output to C by (B). (Ending data - Beginning data)
The calculation unit 20 calculates from end data DD of the number of clock pulses from the start signal S to the end to initial data DC of the number of clock pulses from the start signal S to the beginning.
By subtracting i, the measured value can be obtained as a-. The value is held in the calculation result data latch 21. This diagonal output is performed in the phrase where the terminal value latch signal L4 is output, and the simulation result data DS is input to the data comparison section 22, and the maximum value L)M therein is latched to the maximum value latch 23, The value is converted to actual size and displayed on the display section 12.

Next, the effect will be explained. The case of measuring the object 2 to be measured, such as a disc with no holes or holes, will be explained using the timing chart shown in Fig. 6. In the figure, graphs that are the same as those in Figs. The explanation will be omitted.

The end? Considering the timing AV of the amplified video signal VQ' created by AIJid, is this the beginning of the hidden treasure 2? ! When the 1S signal is output, the first end latch signal is output, and the first end data Uc is latched. Similarly, at timing B, the terminal end 111 is detected, and the terminal value latch signal L4 is output.

After latching the terminal data L)D=2, the performance result data LJS is output. At timing C, the maximum measured value DM based on the comparison result is latched in the data maximum value latch 23 by the measured value latch signal L1, and the maximum diameter of the plate to be measured is displayed on the display section 12 as an actual dimension.

At timing LJ, the latch 18, 19 and up counter 17 are reset by the start signal S every time sampling starts.

Next, a case will be described in which a disk 21 having a hole H as shown in FIG. 7 is scanned and measured in the q direction.

In FIG. 8, descriptions of parts that are the same as those in FIG. 6 are partially omitted. Amplified video signal with emphasized edges ■Q'
At timing 8 in , the initial end of the disk 21 is
(A) and the first end latch signal are output to the first end 2-1^ converted video signal C. Next, at the end of hole H, at timing F, the end of 11 summer i@(binarized video information C (
B) and the terminal value latch signal are output, and the final 91M data L)X and the performance result data [
JS is output.

Furthermore, because of the hole H, the initial end binarized video signal VQ' is output at the dip timing E, but the latch control section 16
By providing the initial edge binary video signal C with a function of invalidating signals other than those for which (A) is first detected during the n-th sampling, the initial edge value latch signal L3 is not output.

At timing B of the true termination part, (B) and the termination value latch signal L4 are output again to the termination binary video signal C, and the true termination value data LJD and the termination value signal L4 are output, and the true termination data DD and performance result data LJ
S can output. At timing G, the measured value latch signal is activated, and the measured data at sampling Sn is output. Timing D is determined by start signal S +8
．． The 19° up counter 11 is reset every sampling. Therefore, there is no problem because the measured data at timing C is output from the measured value switch signal 1(i).

Nana, even if there are multiple holes,
Increased IN with edge emphasis at timings E and F, ″,
Although the video signal VQ' is repeatedly output, measurement can be made without being affected by the holes by subtracting the sound of the first end data output from the end data output after #.

In the above embodiment, FJuit! I used the circle A field as the II constant proboscis, but it is clear that even for a general I giant body, by creating its projection with parallel rays, the maximum width of the hole can be determined without regard to the hole. It is.

As shown in the diagram above, this invention is capable of producing two low-frequency video signals (as g By providing a latch control section, it is possible to prevent disturbances such as signal waveform distortion and noise caused by the length of the wiring during measurement. Since the configuration is configured to count only the data of the starting end and the data of the true end of the measured object, 61
1 [It has the effect that even if there is a hole in the fixed plate, errors will not occur due to this.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a conventional maximum width optical measurement circuit, Fig. 2 is a timing chart of the voltage waveform of sand ij 1% in Fig. 1, and Fig. 3 is a diagram showing the timing chart of the voltage waveform in Fig. 2. Figure 4 (Pi) is a front view showing the relationship between the movement of the disc and the image sensor, and Figure 4 (B) is a diagram showing the detailed timing chart of the disc. FIG. 5 is a block diagram showing an embodiment of the maximum width optical measuring circuit according to the present invention, and FIG. 6 is a voltage timing chart of the main parts in the block diagram of FIG. 5. The figure which shows the case where a disk without a hole is fixed 611. FIG. 7 is a front view showing the sampling timing of a perforated disk, and FIG. 8 is a diagram showing a voltage timing chart of the main parts in the block diagram of FIG. 5 in the case of a perforated disk. 1... Image sensor 2... Measured object 13... Amplifier 14.15... Comparator 16... Latch control section 18... Initial value latch 19... End value latch 20... Performance n'' section /, /. Fig. 2 Fig. 3 '+n Fig. 4 (B) (B) Procedural amendment (voluntary) August 3, 1980 Kazuo Wakasugi, Commissioner of the Japan Patent Office1, Indication of the case 1981 Patent Application No. 170937
No. 2, Name of the invention Maximum width optical measuring circuit 3, Relationship with the case of the person making the amendment Applicant address (residence) 11i+ (name) (230) Stanley Electric Co., Ltd. Representative 5, Date of amendment order (tJ Showa year, month, day (self-motivated) 6, supplement j [number of inventions increased by 8, content of amendment Ill Page 4, line 8, L1 to 7, page 12, line 4 of the specification, ``In Figure 2... . . . is effective." is corrected as follows. "At the timing shown by C in FIG.
, the object 2 to be measured is added to the display section 12 and the image sensor 1
Reset all of these before entering the front page. In this way, it is used for the clock pulse signal of the down counter 8 which is synchronized with the clock pulse φ and which is preset with the video signal sound from the image processor 1. That is, the amplified video signal vQ output from the amplifier 6 is passed through the conoparator 7.
The video signal C is converted into a binary video signal C, and the down counter 8 counts down by 7. The measured value obtained by down-counting is the measured value latch signal L1 output from the control unit 4.
The measured value is held in the measured value latch 9. The measurement data D
is input to the data comparison unit 11, and if it is the maximum value in this lifetime, the maximum value latch signal L is output from the data comparison unit 11.
2, the maximum value data DM is held in the maximum value latch 10 as C, and the maximum value data DMK is multiplied by a certain constant to be converted into an actual length and displayed on the display section 12. FIG. 4(a) shows the relationship between the disk-shaped fixed object 611j, the image sensor 1, and the guide q, in which the object 2 is moved in the direction of arrow rj5. Fig. 4 (b) shows the 6++1 constant 2 as a coupling signal 5n (n=t, z, a...)
This is a diagram showing a state in which pixels are scanned by , and shows that the six-way data D (FIG. 2) of the sappling signal S1 is the maximum. In such a conventional maximum width optical measurement circuit, 611
If there is a hole in the proboscis of the disk to be measured, the video signal will be output at this hole, so the town color will be 81 degrees from the extra H1, so the diameter will be smaller than the actual diameter. displayed small. In addition, C
In many cases, there is a distance between the sensor section and the judgment section, which consists of counters, latches, data comparison sections, etc., and the high speed of the clock pulse from the sensor section. However, due to the long wiring, the signal is easily transmitted, so the waveform is distorted and noise is easily mixed in, resulting in an error in the measured value. In view of the above-mentioned points, the invention of ``0'' lowers the signal frequency by using an end-emphasized signal that emphasizes the amplitude and time of the video signal at the beginning and end of the object to be measured. By using a frequency, the influence of the wiring length between the sensor section and the judgment section can be prevented7, and the detection signal of the first end of C can be stopped by using the latch control section once the terminal end is detected. The purpose of the present invention is to provide an optical measuring circuit with the maximum width that eliminates errors caused by holes placed in the object to be measured. Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 5, 6, 7, and 8. In FIG. 5, parts that are the same as those in FIG. The amplifier 13 is AC coupled (alternating current coupled) to the output side of the image sensor 1, and
The amplified video signal ■Q'(
(See Figure 6)
is input to the comparator 14 and the comparator 15. The comparator 14 sets the threshold level l+ lower than the normal amplified video signal below the end, and outputs (A) to the binarized video signal LjC at timing G at the beginning end to the wrap control 1i11 section 16. Similarly, the V controller 15 is set to a high threshold level 1vVc, and the thread %, Qj'l' (t91it7) time 7 riK (7) 21 straightening hite 'A' m (/K (B)) is latched open. It is output to the first section 16. The up color/return 17 is reset by the numbering start signal M'S from the sub-side 1st section 4. The first VfM full!l latch 18 is reset by the start signal S, and counts the clock pulses (data of the up counter 1T) from the start signal S to the initial timing G. Similarly, the latch 19 is used to hold the number 7 of the clock pulses from the start signal S to the timing Kt of the termination part.
B) outputs the initial value latch signal L3+the final value latch signal L4. The calculation unit 20 that calculates (termination data - initial edge data) calculates initial edge data Dc of the number of clock pulses from the start signal S to the initial edge from the termination data DD of the number of clock pulses from the start signal S to the termination. By subtracting, the measured value can be calculated. This calculation is performed every time the terminal value latch signal L4 is output. Performance'I! ,
The measured value Ds output from the unit 20 is traced at timing A by the measured value latch signal L1 and held in the i! clutch.The measured data V is input to the data comparing unit 11, and it is If the maximum value of
The value is held at 0, and the value is converted into an actual size and displayed on the display section 12.Next, the operation will be explained. First, the case of measuring the object 2 to be measured, such as a disk without holes, will be explained using the timing diagram shown in FIG. 6. In the figure, for the same graphs as in FIGS. Reference numerals are given and explanations are omitted. At timing G of the amplified video signal VQ' with the edge i$ emphasized, the first edge of the object under test 2 is detected (7, the first edge value latch signal L1 is outputted, and the first edge data De becomes 1).
First of all, I am stunned. , l#1, the terminal end is detected at timing K, the terminal value latch signal L4 is output, the terminal data υ1) is held, and the measured value L)S is output. d
At timing A, the measured value is held in the latch 10, and at timing B, it is held in the maximum value latch 10 by the maximum value latch No. 1i L2 by the comparative connection. The maximum diameter of the object to be measured is displayed. At timing I, latch 1 is activated by start signal S.
B, 19, the up counter 17 is reset every sample/gesture start. Next, the disk 21 with the hole H as shown in FIG.
A case where C measurement is performed by scanning in five directions will be described. In FIG. 8, explanations of parts that are the same as C1 in FIG. 6 will be omitted. Amplified video signal with edge emphasis ■Q'
At timing G, the first end of the C disk 21 is detected, and the first n1 section 21 direct (high video signal GK (A) and first end value latch signal L3 are output. Next, because of the hole H, timing F -I body termination part binarized video signal GK (
B) and the termination part latch signal L4 are output, and the termination data υ1) and the width j constant value Ds are output as intermediate data. Because of the hole H in the history, the first end binarized video signal CK (A) is output again at timing E. By providing the video signal C1 ((c) with a function to disable anything other than the first detected signal,
The initial value latch signal L3 is not output. At timing K of the true termination section, the termination section binary video signal CK (B) and the termination value latch signal L4 are output again, and the true termination value data D, r, + and the measured value DS are output.
is output. At timing B, the measured value latch signal outputs constant data DN at sampling Sn. Therefore, when the measurement data D based on the measurement value latch signal L1 at timing A is output, there is no problem because the hole H becomes irrelevant. Note that even when there are multiple holes, the amplified video signal V (λ'
is output repeatedly for 1, but the last output is 1. By subtracting the first output data from the P end data, 6111 can be determined without being affected by the hole. In the above embodiments, a disk was used as the constant object, but by creating a projected image of a general object using a single line of light, the maximum width of the relationship h<, t can be measured at the hole. It is obvious that it can be done. As shown above, the present invention has a waveform of 171
1. ! By strengthening the part i1^1, it is transmitted to the ``I'l+ constant part'' as a low-frequency binarized PITEO signal 7. Since the L sea urchin (14) has been constructed, it is possible to prevent disturbances such as noise, etc. due to the length of the wiring.In addition, by providing a latch control section, Since the calculation result of the data at the beginning end and the data at the true end is set as measurement I+#, there is an effect that even if there is a hole in the treasure treasure, no error will occur due to this. (As shown in Attachment 21, Figure 1, Figure 3, Figure 5, Figure 6, Figure 7, and Figure 8 are corrected.)

Claims (1)

[Scope of Claims] A Jvj width transducer that outputs a full amplified video signal that emphasizes edge signals of the image by AC-coupling a time-series image seven-dimensional output signal corresponding to the first awakening of the source position of the object to be measured; a combiner for slicing the amplified video signal at desired upper and lower levels and outputting upper and lower split video signals; The terminal value latch that holds the number of pulse signals at times 11JI L and the previous M1. + A first end latch that holds the number of pulses 1 at the first end of 13' from the start of the link, and a first end value latch from the output of the front 11" and last end I?1 latch. Subtract the output?lu+
a calculation η section for deducing a constant value; and the terminal 9i+. The part binarization signal detected once is χ.
1. An optical measuring circuit of maximum mx, characterized in that it comprises a latch control section which controls the output of a latch signal of the first latch during assembly.