JPH0256605B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a coil inclination determination device for determining the inclination of a filament coil in, for example, a light bulb.

[Technical background of the invention and its problems]

It is generally known that in a light bulb, if the inclination of the filament coil is too large, the light distribution characteristics of the light bulb will deteriorate. For this reason, conventionally, the inclination of the filament coil has been visually determined to classify good products and defective products. However, when the inclination of the filament coil is visually determined in this manner, accurate determination cannot be made, and the efficiency of the determination work is also low.

[Purpose of the invention]

This invention was made to eliminate these drawbacks, and it is possible to accurately determine the coil inclination.
Moreover, the present invention provides a coil inclination determination device that can sufficiently improve the efficiency of determination work.

[Summary of the invention]

This invention images a coil supported at both ends with a two-dimensional image sensor, displays it on a television monitor, separates a horizontal synchronization signal and a vertical synchronization signal from the video signal of the television monitor, and also separates a horizontal synchronization signal and a vertical synchronization signal from the video signal of the television monitor, and also separates the signal of each turn of the coil. The number of rasters on the monitor screen is counted by the first counting circuit until the first turn signal is detected in synchronization with the vertical synchronization signal, and is set in advance for one raster scan in synchronization with the vertical synchronization signal. The number of rasters on the monitor screen is counted by the second counting circuit until the specified number of turn signal parts are detected, and the slope of the coil is calculated by comparing the count number of the second counting circuit and the first counting circuit for the predetermined number of coil turns. The determination is made based on the difference in the number of counts, that is, the number of rasters that fit between the upper end of the turn on one end side of the coil and the upper end of the turn on the other end side.

[Embodiments of the invention]

In Fig. 1, 1 is a coil to be inspected, such as a filament coil fixed to a light bulb, for example, and a pair of light sources 2a, 2b illuminates the coil 1 from behind through ground glass 3a, 3b. ing. In front of the coil 1 is a right angle prism 4.
is provided, and an image of the coil 1 is captured through the prism 4 by an industrial television camera 5 serving as a two-dimensional image sensor. The image taken by the camera 5 is displayed on a television monitor 6. A video signal is taken out from the monitor 6 and supplied to a signal separation circuit 7 forming a part of signal separation and detection means. The signal separation circuit 7 inputs the input video signal to a video/synchronization signal separation circuit 9 via an amplifier 8, separates it into a horizontal synchronization signal HS, a vertical synchronization signal VS, and a video signal VIS, and further outputs the separated video signal. Signal VIS black level detector 10
The level is compared with the black threshold level SL from the input level setter 11, and a signal portion where the video signal level is below the black threshold level SL is detected,
A high-level black level signal BL corresponding to the detected signal portion is output. That is, coil 1
As shown in FIG. 2a, the image is the darkest on the front circumferential surface of each turn T, and is thinner on the rear circumferential surface. Therefore, when the raster scan is performed at the position indicated by the arrow in the figure, the video signal becomes as shown in FIG. 2b. In contrast, the black thread level
If the SL is set as shown, the black level signal shown in c in FIG. 2 can be obtained. In this case, if a foreign object A is present between the front peripheral surfaces of the turn, the video signal level of the foreign object will also be below the black threshold level SL, and will be taken out as a black level signal.

In the figure, 12 is a timing signal generation circuit, and this circuit 12 uses an AND gate 14 to logically AND the start signal ST generated by turning on the start switch 13 and the vertical synchronization signal VS, and outputs the AND gate 14. It sets the flip-flop 15 and inputs it to one input terminal of the OR gate 16. Further, the other input terminal of the OR gate 16 receives a reset signal generated from a power-on reset circuit 17 when the power is turned on. Then, the output of the OR gate 16 is sent to the first clear signal C1.
The signal is outputted as a second clear signal C2 via the inverter 18. The output of the inverter 18 is input to one input terminal of an AND gate 19. The horizontal synchronizing signal HS is inputted to the other input terminal of the AND gate 19 via an inverter 20. The output of the AND gate 19 is output as a third clear signal C3 and is input to one input terminal of the AND gate 21. The black level signal BL is input to the other input terminal of the AND gate 21. Then, the output of the AND gate 21 is
It is output as a clear signal C4. An AND gate 22 calculates the AND of the set output of the flip-flop 15 and the vertical synchronizing signal VS, and a counter 23 counts the number of vertical synchronizing signals VS outputted via the AND gate 22.
The counter 23 is reset via the inverter 24 when the start signal ST is input. The counter 23
The output is compared by a comparator 25 with a set value of a scan field number setter 26. The setter 26 is used to set the number of fields for completing scanning of all scanning lines during interlaced scanning. The comparator 25 resets the flip-flop 15 when the count value of the counter 23 reaches the set value of the setter 26.

In the figure, numeral 27 denotes a coil turn detection circuit forming the other part of the signal separation detection means, and this circuit receives the black level signal BL, the set output of the flip-flop 15 of the timing signal generation circuit 12, and the clock signal from the clock generator 28. An AND gate 29 which takes the AND of the AND gate 29, and a counter 30 which counts the clock signal outputted through the AND gate 29 are provided. The counter 30 is the fourth
It is reset by the clear signal C4. In addition, the count value of the counter 30 and the lower limit standard setting device 3
A lower limit comparator 3 which compares the lower limit standard value of 1 and outputs a high level signal when the count value is equal to or higher than the lower limit standard value at the timing when the black level signal BL falls.
2, the count value of the counter 30 and the upper limit standard value of the upper limit standard setter 33 are compared, and the black level signal is determined.
An upper limit comparator 34 is provided which outputs a high level signal when the count value is less than the upper limit standard value at the timing when BL falls. and both comparators 3
The AND gate 35 takes the AND of the outputs of 2 and 34, and outputs the output of the AND gate 35 as a turn detection signal for the coil 1. That is, the lower limit and upper limit standard setters 31 and 33 respectively have a lower limit standard value and an upper limit standard value for determining whether the width of the signal detected as the black level signal corresponds to the coil diameter. is set.

A turn detection signal output from the coil turn detection circuit 27 is supplied to a first raster counting circuit 36 and a second raster counting circuit 37, respectively. The first raster counting circuit 36 includes a flip-flop 38, an inverter 39, an AND gate 40, and a counter 41. The flip-flop 38 is set by a turn detection signal from the coil turn detection circuit 27, and the set output is sent to the inverter. 39 through the above AND gate 4
It is input to one input terminal of 0. The flip-flop 38 is reset by the first clear signal C1. The horizontal synchronizing signal HS is input to the other input terminal of the AND gate 40.
The counter 41 counts the output of the AND gate 40 and is reset by the second clear signal C2. Said second raster counting circuit 3
7 consists of a counter 42, a comparator 43, a total coil turn number setting device 44, a flip-flop 45, an inverter 46, an AND gate 47, and a counter 48, and the number of inputs of the turn detection signal from the coin intern detection circuit 27 is determined by The counter 42 counts, and the comparator 43 compares the counted number of the counter 42 with the set number of the total coil turns setting device 44.
are compared. Said coil total number of turns setting device 4
4 is set to the number of turns of the coil 1. When the count number of the counter 42 and the set number of the setter 44 match in the comparator 43, a match output from the comparator 43 causes the flip-flop 4 to
5 is set. The output of the flip-flop 45 is inputted to one input terminal of the AND gate 47 via the inverter 46.
The horizontal synchronizing signal HS is input to the other input terminal of the AND gate 47. The counter 4
8 counts the output of the AND gate 47 and is reset by the first clear signal C1. The first and second raster counting circuits 36, 3
The outputs of the counters 41 and 48 of 7 are supplied to a displacement calculation and determination circuit 49 that determines the inclination of the coil.

The displacement calculation determination circuit 49 includes a pair of three-state latch buffers 50 and 51, and a subtracter 5 that calculates the difference between the outputs of both the latch buffers 50 and 51.
2. A comparator 54 that compares the difference calculated by the subtracter 52 with the set value of the displacement standard setter 53 and sends an output when the difference exceeds the set value, and a comparator 54 of the first raster counting circuit 36. A NAND gate 55 receives the set output of the flip-flop 38 and the set output of the flip-flop 45 of the second raster counting circuit 37, a flip-flop 56 that is set by the output of this NAND gate 55 and reset by the first clear signal C1, and It consists of an AND gate 57 to which the set output of the flip-flop 56 and the output of the comparator 54 are input, and the output of the NAND gate 55 is used to buffer both the latch buffers 5.
0 and 51 are latched, and the AND gate 5 is
7 output is output as a defect removal signal RS.

Next, the operation of the embodiment of the present invention configured as described above will be described.

An image of the coil 1 to be inspected is captured by a television camera 5 via a prism 4 and displayed on a television monitor 6. Now, suppose that an image as shown in a in FIG. Further, as shown in FIG. 2b, the black level detector 10 detects the level below the black threshold level SL in the video signal VIS as the black level portion, and as shown in FIG. 2c, Outputs a black level signal BL. Therefore, the counter 30 of the coil turn detection circuit 27 counts the clock signal from the clock generator 28 shown in d of FIG. 2 at the timing when the black level signal BL is input, and at the timing when the black level signal BL disappears. It will be reset. Then, at the timing when the black level signal BL disappears, both the lower limit and upper limit comparators 32 and 34 detect whether or not the count value of the counter 30 is between the preset lower limit value and upper limit value. If it is, it is determined that it is a turn part of the coil 1, and the AND gate 35 outputs a turn detection signal shown in e of FIG. Therefore, as shown in Figure 2a, even if the foreign object A is between the turns and that part is output as the black level signal BL, the count value of the clock signal due to the black level signal is smaller than the lower limit value, so the final Generally, it is cleared and is not output as a turn detection signal.

On the other hand, the counter 4 of the first raster counting circuit 36
1 is a turn detection signal from the coil turn detection circuit 27, which counts the number of horizontal synchronizing signals HS input through the AND gate 40, that is, the number of rasters on the monitor 6, unless the flip-flop 38 is set. Further, the counter 48 of the second raster counting circuit 37 receives the horizontal synchronizing signal inputted via the AND gate 47 unless the flip-flop 45 is set by the output of the comparator 43.
The number of HSs, that is, the number of rasters on the monitor 6 is counted. When the first turn detection signal is output from the coil turn detection circuit 27, that is, when there is a raster scan across the head of the turn at one end of the coil 1, as shown by line _R1 in FIG. 3, the first raster count is started. A flip-flop 38 is set in circuit 36, thereby causing inverter 3
9 output becomes low level, and the counting operation of the raster number of the counter 41 is stopped. If the raster at this time is the x-th raster, the count value of the counter 41 is x. Further, in the second raster counting circuit 36, a counter 42 counts the number of inputs of the turn detection signal. This counter 42 is reset by a third clear signal C3 outputted in response to generation of the horizontal synchronizing signal HS. As shown by the line _R2 in FIG. 3, the counter 42 calculates the number of turns set by the coil total turn number setting device 44. The flip-flop 45 is set by the coincidence output from the comparator 43. Therefore, the set output of the flip-flop 45 causes the inverter 46 to
The output becomes low level and the counting operation of the raster number of the counter 48 is stopped. If the raster at this time is the x+αth raster, the count value of the counter 48 is x+α. At the timing when the flip-flop 45 is set, the output of the NAND gate 55 becomes low level, and the counter 4 is sent to the subtracter 52 via both latch buffers 50 and 51.
Count values of 1 and 48 are respectively input. In this way, the comparator 54 checks whether the α value obtained by subtracting with the subtractor 52 is larger than the set value of the displacement standard setter 53, and if it is not, it is determined that the inclination of the coil 1 is within the standard range. However, if it becomes larger, it is determined that the inclination of the coil 1 is not within the standard range. When the slope of the coil 1 is outside the standard range, an output is sent from the comparator 54, and a defect removal signal RS is output from the AND gate 57, and the article to which the coil 1 to be inspected is attached is removed as a defective item. That will happen.

In this way, the inclination of the coil 1 to be inspected is detected by converting it into a raster number using the video signal of the television monitor 6 that displays the image of the coil 1, so the inclination of the coil can be measured with high accuracy. The coil inclination can be accurately determined. Moreover, since the measurement and judgment are performed automatically, the efficiency of the judgment work can be sufficiently improved. Furthermore, even if there is a foreign object between the turns of the coil 1, there is no possibility that the foreign object will be mistakenly determined as a coil turn, and the coil inclination can be determined more accurately.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide a coil inclination determining device that can accurately determine the inclination of a coil and can efficiently perform the determination work by automation.

[Brief explanation of drawings]

The figures show an embodiment of the present invention. Figure 1 is a block diagram, Figure 2 is a waveform diagram for explaining the operation of the signal separation circuit and coil turn detection circuit, and Figure 3 is a diagram showing the coil inclination and raster. FIG. 3 is a diagram showing the relationship with scan. 1... Coil to be inspected, 5... Television camera, 6... Television monitor, 7... Signal separation circuit, 27... Coil turn detection circuit, 36...
First raster counting circuit, 37...Second raster counting circuit, 49...Displacement calculation determination circuit.

Claims (1)

[Claims] 1 A coil supported at both ends, a two-dimensional image sensor that images this coil, a television monitor that displays the image by inputting the output of this image sensor, and a horizontal synchronization signal and vertical synchronization signal from the video signal from this monitor. Signal separation and detection means separates the signal and detects the signal portion of each turn of the coil, and starts counting the number of rasters on the monitor screen in synchronization with the vertical synchronization signal from this signal separation and detection means. A first raster counting circuit stops the counting operation upon detection of the signal section, and starts counting the number of rasters on the monitor screen in synchronization with the vertical synchronization signal from the signal separation detection means, and is set in advance at the time of one raster scan. A second raster counting circuit that stops counting when a turn signal portion of the number is detected, and a difference between the count number of this second raster counting circuit and the count number of the first raster counting circuit is calculated. , and means for determining the coil inclination based on the difference thereof.