JPS6348431A - Lens inspecting device - Google Patents

Abstract

PURPOSE:To securely detect a defect due to the chipping of the peripheral part of a lens characteristic to the lens by dividing a lens image picked up by an image pickup means into the center part and contour part by an inspection range output means and deciding whether or not each part is normal. CONSTITUTION:The lens to be inspected is irradiated by a lighting means and the image of the irradiated lens is picked up by a television camera 9, whose output is converted by a binary coding processing circuit 15 into a binary signal. This binary signal 16 is divided into two inspection ranges with the outputs of a center part inspection range output circuit 17 and a contour part inspection range output circuit 18 and outputted to a center part decision circuit 26 and a contour part decision circuit 27. The decision circuits 26 and 27 counts the period of the binary signal within the center part and contour part inspection ranges and decide whether or not the signal times are within the reference time range to decide whether or not the lens is normal. An OR circuit 30 outputs a decision result 41 indicating that the inspected lens is normal when both of the decision circuits 28 and 29 generate conforming outputs.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lens inspection device for inspecting the surface of a single lens and the condition inside the glass of the lens. The present invention relates to a lens inspection device that images the internal state of the glass of a lens with a television camera, processes the video signal output from the image, extracts defects in the lens, and automatically determines whether the lens is good or bad.

[Prior Art] Conventionally, when assembling a lens such as a camera lens, the quality of a single lens to be assembled has generally been inspected visually by an operator.

On the other hand, in order to automate such inspections, the lens is imaged with a television camera, the image signal obtained from the image is converted into a digital signal, and the digital signal is stored and programmed to be processed to determine whether the lens is good or bad. A lens inspection device was provided.

[Problems to be Solved by the Invention] However, the conventional visual lens inspection method is based on the operator's judgment based on experience and sensual judgment, so the judgment may vary depending on the worker's fatigue level and individual differences. There was a drawback that it occurred. In addition, since the lenses are handled by hand, there are also drawbacks such as the lenses may get dirty.

Further, although the above-mentioned lens inspection apparatus that automates the visual inspection does not have the above-mentioned drawbacks, it does have the disadvantage that the processing time becomes long because the determination is made by program processing after storing the video signal.

Furthermore, the lenses have spherical, convex and concave shapes, and
Since the lens has a variety of shapes, there is a drawback that when inspecting the entire surface of the lens, the number of shots is increased, which naturally lengthens the processing time. Another drawback is that it is a complicated device because it inspects a wide variety of lens defects in a wide variety of shapes.

The present invention eliminates the above-mentioned drawbacks, enables high-speed inspection of the entire surface of spherical, convex, and concave shapes, which are unique to lenses, with one inspection device. Scratches, scraping of material around the edge (contour), air bubbles inside the material, scratches on the coating film on the crank and surface, leakage at the extreme part of the @, particle size of coating chemicals, dirt, dust, lint, etc. It is an object of the present invention to provide a lens inspection device capable of automatically detecting various defect items and determining pass/fail.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an illumination means for illuminating a single lens, which is an object to be inspected, with transmission inspection illumination or reflection inspection illumination, and an imaging means for capturing an image of the lens and outputting a video signal; a signal processing means for extracting a defect signal indicating a defect in the lens from the video signal;
Inspection range output means outputs an inspection range divided into two parts, a center part and an outline part, of an image of the lens captured by the imaging means, and a defect signal outputted from the signal processing means within the inspection range outputted from the inspection range output means. and a determination means for determining pass/fail of the lens based on the above, and the determination means measures the binarized signal time within the center inspection range after processing the video signal at the center in the real time of the video signal. Then, a pass/fail judgment is made by comparing whether the measured binarized signal time is within a predetermined reference time range, and in the case of contours, the binarization of the contours is performed for each television horizontal scanning line within the contour inspection range. Measure the signal width, compare whether the measured binarized signal width is within the standard width range, and further compare whether the number of scanning lines outside the standard width range is within the standard scanning line number range. A pass/fail judgment is made, and in the pass/fail judgment process for the center and contour parts, if both are within the reference range, the lens is judged to be good, and if either is judged to be outside the reference range, the lens is judged to be defective. characterized by things.

[For use] In the present invention, it is possible to quickly inspect the entire surface of a lens body with a spherical surface and a convex/concave shape, which are unique to lenses, with one inspection device. Scratches on the surface, scraping of material around the edges (contours), air bubbles and cracks inside the material, scratches on the coating film on the surface, extreme parts of the coating film, particle size of the coating material, dirt,
It is also possible to detect various types of defects such as dust and lint attached to the lens, and it is possible to automatically and easily determine whether the lens is acceptable or not based on these detections.

That is, according to the present invention, (1) Since the determining means for performing the pass/fail determination process for the lens is provided with two parts, one for the center part and one for the outline part, it is possible to eliminate
It is possible to reliably detect defects such as ink painting on edges to prevent reflection.

■ When we binarized the video signal obtained by imaging the lens to be inspected, we divided the video signal into two, delayed one part a little, and took the difference between the two. Only the defective portion can be extracted from the uneven amount of light received by the camera.

(2) Since inspection illumination is provided for transmission inspection and reflection inspection, one inspection device can detect not only defects in the lens material but also defects in the coating film on the lens surface.

■ Light for inspection is emitted in synchronization with the TV vertical synchronization signal, and the lens to be inspected is rotated at a predetermined rate, for example, 3600/nrp.
Since the lens rotates at a rotation speed of m (n - number of circumferential divisions), it is possible to inspect the lens for defects while continuously rotating the lens to be inspected. Furthermore, since the processing means can be constructed from a hardware circuit, the output video signal can be processed in real time, thereby enabling high-speed inspection.

■ Furthermore, it is equipped with a mechanism for moving and tilting the lens to be inspected in the horizontal and vertical directions, a mechanism for moving the television camera toward the in-focus point, and two parts for outputting the inspection range of the lens: the center part and the contour part. Therefore, it is possible to inspect lenses of various different shapes.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the basic configuration of an embodiment of the present invention.

In FIG. 1, a and a' are illumination means, a for reflected light and a' for transmitted light. b is a lens to be inspected. C is a lens moving means that controls the posture and rotation of the lens b to be inspected according to a preset procedure.

Reference numeral d denotes an imaging means that generates a video signal by receiving light reflected or transmitted from the lens b to be inspected, and is comprised of, for example, a television camera. Denoted at e is a binarization means, which divides the video signal from the imaging means d into two parts, delays one part slightly for a predetermined period of time, calculates the difference between the two signals, and binarizes the video signal.

f is an inspection range output means which determines the inspection range of the lens part and outputs a detection range signal. That is, the inspection range output means f outputs two types of inspection range data divided into the center part and the contour part of the lens to be inspected b in synchronization with the video signal as inspection range instruction data matching the lens image captured by the imaging means d. do. g is a signal extraction means consisting of, for example, a gate circuit, and based on the two types of inspection range data output from the inspection range output means f, extracts the center and contour parts of the lens b to be inspected from the output signal of the binarization means e. Extract and output the signal at. Denoted by h is a determining means, which determines whether or not there is a defect in the inspection lens b based on the output signal of the signal extracting means g.

FIG. 2 shows the overall configuration of an embodiment of the present invention.

1 is a lens to be inspected, and 1' is a pedestal for setting the lens 1 to be inspected, which is rotatable. 1″
is a base plate that supports the lens to be inspected via a pedestal 1'. 2 is a motor for moving the lens 1 to be inspected in the horizontal direction indicated by xx' in the figure, and 2' is a stage that is driven by the motor 2 to move in the xx' force direction. 3 is a motor for moving the lens 1 to be inspected in the vertical direction indicated by y-y' in the figure, and 3' is a stage that is driven by the motor 3 to move in the y-y' force direction.

4 is a motor for tilting the lens 1 to be inspected in the rotational direction indicated by φ in this figure, and 4' is a motor that moves the motor 4 to the stage 3.
It is a support that is fixed to '. The tip of the rotating shaft of the motor 4 is fixed to the base plate 1'', and by rotating the motor 4, the lens 1 to be inspected can be tilted.

By controlling the rotation of these motors 2.3 and 4, the lens 1 to be inspected can be positioned at an inspection position suitable for the shape of the lens 1 to be inspected.

Reference numeral 5 denotes a motor for rotating the lens 1 to be inspected, and the lens 1 to be inspected is attached to the pedestal 1' via a belt 6.
rotate around the optical axis.

7 is a stage 8' that is moved by the drive of a motor 8.
stage 8 with a predetermined inclination.
′ is slidably placed on it.

Reference numeral 9 is a television camera that takes an image of the lens 1 to be inspected, and reference numeral 0 is a lens of the television camera 9. These television camera 9 and lens 10 are fixed to a stage 8' and are set parallel to and at the same inclination as the inclined surface of the pedestal 7.

Furthermore, by controlling the rotation of the motor 80 for moving the stage 8', the television camera 9 can be focused on the surface of the lens 1 to be inspected at a predetermined inspection position. In addition, these motors 2, 3, 4.5
The drive control at 8 and 8 is performed by the drive system control section (4 in Fig. 3), which will be described later.
0).

The setting of the optimum inspection position for transmission inspection and reflection inspection and the setting of the focus of the television camera 9 are performed as follows.

First, the stages 2', 3', the motor 4, and the stage 8' are moved as appropriate from their respective origin positions by manual operation (also referred to as manual operation), and at the same time the output of the television camera 9 is reproduced on a television monitor (described later). (
Determine the optimal position for transmission inspection and reflection inspection while watching the image 13) in Figure 3. The inspection position and the focus position of the television camera 9 are determined by such manual operations. At this time, each stage 2', 3' at each inspection position is determined.
, the positions of motor 4 and stage 8', that is, the amount of movement from each origin position to each inspection position, are automatically read and stored in a main control circuit (31 in FIG. 3) to be described later. Thereafter, when performing automatic inspection, the movements and positions of stages 2', 3', motor 4, and stage 8' are determined based on the above-mentioned movement amount at each inspection position stored in the main control circuit. Automatic control is performed to sequentially inspect lenses at each inspection position.

11 is an illumination device for transmission inspection, and 12 is an illumination device for reflection inspection. These lighting devices are switched to emit light as needed. Note that both do not emit light at the same time.

FIG. 3 shows an example of the configuration of an electrical system that performs operation control and inspection processing in the embodiment of the present invention shown in FIG. In Figure 3,
13 is a television monitor (receiving device) that visualizes the television signal sent from the television camera 9, 14
14' is a signal line that transmits a video signal from the television camera 9, and 14' is a changeover switch. 15 is a video signal binarization processing circuit that binarizes the video signal from the television camera 9; 16 is the video signal binarization processing circuit 15;
This is a signal line that transmits the output signal. Changeover switch 1
By switching 4', it is possible to switch and display the video from the television camera 9 and the output from the binarization processing circuit 15 on the monitor 13.

Reference numeral 17 denotes a center inspection range output circuit, which outputs an instruction signal that sets the center of the lens to be inspected as the inspection range. Reference numeral 18 denotes a contour inspection range output circuit, which outputs an instruction signal to set the contour of the lens to be inspected as the inspection range. Reference numeral 19 indicates a signal line for transmitting the output signal of the center inspection range output circuit, and 20 indicates a signal line for transmitting the output signal of the contour inspection range output circuit 18. 21 is the signal of the above-mentioned signal line 16 and signal &119
22 is an AND circuit that takes the logical product of the signals on the signal line 16 and the signal on the signal line 20. 23 is a signal line that transmits the output signal of the AND circuit 21, and 24 is a signal line that transmits the output signal of the AND circuit 22. Reference numeral 25 denotes an OR circuit which performs the logical sum of the signal on the signal line 23 and the signal on the signal line 24, and the output terminal of this OR circuit 25 is connected to one contact of the changeover switch 14'.

26 is a center determination circuit that determines the center of the lens based on the output signal of the AND circuit 21; 27 is the AND circuit 2;
This is a contour portion determination circuit that determines the contour portion of a lens based on the output signal of No. 2. 28 is a signal line that transmits the output signal of the center portion determination circuit 26, and 29 is a signal line that transmits the output signal of the contour portion determination circuit 27. 30 is an OR circuit that takes the logical sum of the signal on the signal line 28 and the signal on the signal line 29;
The output of the OR circuit 30 is output to the outside as a determination result.

A main control circuit 31 performs overall control according to the present invention, and includes a microcomputer, memory, and the like. 32,3
3, 34, 35, 36, and 37 are control lines from the main control circuit 31. 38 is a television synchronization signal generation circuit, and the television camera 9 performs imaging in synchronization with the signal of the television synchronization signal generation circuit 38. 39 is a lighting power supply and a power supply switching circuit for the two lighting devices 11 and 12. 40 is a drive system control section that drives and controls the motors 2, 3, 4, and 5.8. The output signal 38' of the TV synchronization signal generation circuit 38 is transmitted to the center inspection range output circuit 17 and the contour inspection range output circuit 1.
8 and also to the lighting power supply and power supply switching circuit 39 .

FIG. 4 shows an example of the configuration of the video signal binarization processing circuit 15 described above. FIG. 5 shows signal waveforms of each part constituting the video signal binarization processing circuit 15.

As shown in FIG. 4, the video signal from the television camera 9 passes through the signal line 14 to the amplifier 4 of the video signal binarization processing circuit.
3. Manpower. The video signal from the television camera 9 that is input to the amplifier 43 is the light reflected on the lens surface or the light transmitted through the lens that is converted into a video signal by the camera 9, for example as shown in 51 in FIG. It has a waveform like this. That is, in the signal S1, S is the horizontal synchronization signal of the TV synchronization signal, ■ is the continuous part of the video signal, and nl and n2 are the discontinuous parts with sudden signal changes that occur in the video signal due to defects such as scratches on the lens. It is.

The amplifier 43 performs output impedance conversion and amplifies the video signal to such an extent that the amplitude does not saturate. The output video signal of the amplifier 43 is taken out to a signal line 44 and supplied to a delay device 45 and a subtracter 46. In the delay device 45, a delay of a certain minute time is given to the video signal, and the delay device 45
The output signal line 45' includes a video signal 51' that includes a delayed continuous part v', discontinuous parts n, and n2' as shown by broken lines in FIG. c with respect to the horizontal video signal S1. is taken out and supplied to a subtracter 46 through a signal line 45''.This delayer 45 outputs defect signals (discontinuities) ni,
This will result in a difference in the rise and fall times of n2.

In the subtracter 46, the video signal from the signal line 44 and the signal line 4
A difference calculation with the delayed video signal from 5' is performed, and the calculation result is output to the signal line 47. As shown at 52 in FIG. 5, the differential output signal of the signal line 47 has a continuous portion of the differential value v-v' at a nearly constant level, and a discontinuous portion of the differential output signal with respect to this differential value v-v'. The values n, -n,' and n2-n2' appear as abrupt level changes.

The differential output signal S2 appearing on the signal line 47 is supplied to a first comparator 48 and a second comparator 49.
8 is compared with an upper limit reference value r, and a second comparator 49 is compared with a lower limit reference value r2. As a result, the output signal line 50 of the first comparator 48 receives the differential value n, -nl' of the discontinuous portion greater than or equal to the reference value r1 in the signal S2 as a positive pulse (for example, 5 V). Other parts are 0
A pulse signal as shown at 53 in FIG. 5, which appears as ①, is output.

The output signal line 51 of the second comparator 49 outputs the discontinuous portion n2-n2° of the signal S2 below the reference value r2 as a positive pulse (for example, 5V), and the other portion as an O pulse.
A pulse signal as shown at 54 in FIG. 5, which appears as ①, is output. Note that the reference values r and r2 of both comparators 48 and 49 can be made variable by using variable resistors.

The signal on the signal line 50 and the signal on the signal line 51 are input to an OR circuit 52, and a signal having a waveform as shown at 55 in FIG. 5 is obtained on the output signal line 53.

54 is a changeover switch, and signal lines 50, 51 and 5
The three output signals are switched and one selected output signal is output to the signal line 16.

When selecting with this changeover switch 54, if an ordinary black and white television camera is used to convert an optical image into a video signal, the output signal line 50 of the first comparator 4B has a portion that appears white compared to the background. is output as a positive pulse (5V), and a portion that appears black compared to the background is output as a positive pulse (5V) to the output signal line 51 of the second comparator 49.
Further, since a signal obtained by combining both positive pulses is outputted to the output signal line 53 of the OR circuit 52, the selector switch 54 selects these outputs depending on the purpose of inspecting the lens. - In general, a signal S5 in which pulses indicating defects in both directions are combined is selected and used.

As shown in FIG. 4, the delay device 45 and subtractor 46 are provided in the video signal binarization processing circuit 15 because of the spherical shape with unevenness peculiar to lenses and the variety of refractive index of the material. As a result, the distribution of the amount of transmitted light and reflected light from the lens 1 to be inspected received by the television camera 9 is difficult to be uniform, and the video signal generated by charging and converting these light images is also shown in FIG. It appears as a voltage change with a gentle curve as shown in Sl of
This is because parts other than l r n2 are output in the same way as defects, and it is difficult to correctly detect defective parts, such as not being able to extract all defects.

For example, when the video signal S1 is compared with the reference value r using a comparator, the portion of the video signal that is equal to or higher than the reference value r5 becomes a pulse (5v).
Since the discontinuous portion n and portions other than n2 are also output as defects, the waveform becomes as shown at 56 in the figure. Further, when the reference value of the comparator is set to r4, the discontinuous portion n1 can be extracted, but the discontinuous portion n2 cannot be extracted, resulting in a waveform as shown at 57 in the figure. In order to extract defects from the uneven distribution of the amount of light received due to the spherical shape of the unevenness peculiar to lenses and the refractive index of the material, a video signal 2 provided with a delay device 45 and a subtractor 46 as shown in FIG. 4 is used. The value conversion processing circuit 15 is effective, and thereby the defective portion can be extracted accurately.

The binarized signal thus obtained is supplied to one input terminal of AND circuits 21 and 22 through signal line 1B. The output signal of the center inspection range output circuit 17 is supplied to the other input terminal of the AND circuit 21, and the output signal of the contour inspection range output circuit 18 is supplied to the other input terminal of the AND circuit 22.

As a result, only the binary signal within the center inspection range of the lens is output to the output signal line 23 of the AND circuit 21, and the two binary signals within the lens edge inspection range are output to the output signal line 24 of the AND circuit 22. Only the digitized signal is output.

Next, the above-mentioned center inspection range output circuit 17 and contour inspection range output circuit 18 will be explained.

6(A) to 6(E) show examples of patterns for determining the inspection range of the surface of the lens.
The inside of each pattern shown in (Bl, (C), (D), and (E) can be set as the inspection range, or it can be set as the range to be inspected. Also, by combining these patterns, It is possible to create an inspection range that matches the image of the inspection lens 1 taken by the television camera 9.

For example, for the lens image shown in FIG. 7(A),
Figure 6 (B) is used to determine the inspection range at the center of the lens.
) by using the pattern shown in FIG. 7(B) to determine the center inspection area, and by using the pattern in FIG. 6(C) to determine the inspection area of the lens contour, An inspection range can be created by using the dashed line range shown in FIG. 3(C) as the outline inspection range.

FIG. 8 shows the configuration of an inspection area pattern generator for creating inspection area patterns such as those shown in FIGS. 6(A) to 6(E). FIG. 9 shows the output waveforms of each part of the inspection range pattern generator. Now, taking as an example the case where the pattern shown in FIG. 6(B) is generated, the scanning start point 65 of the television signal shown in FIG. 7(D) is set to x-0, y-0 (here, X= (horizontal direction, y = vertical direction), the coordinate value of the position of point 66 on the screen is X" / =
3' 2% The coordinate value of the position of point 68 on the screen is X=X2
, '/='j1, then yl at point 66 and y at point 67
The vertical range is determined by l.

The respective coordinate values y1 and yl that determine this vertical range are given to the main control circuit 31 by a signal line 35.
The coordinate value yl is supplied to the Yl storage circuit 81 in FIG. 8 via the signal line 80 and stored therein in response to a command signal from
The coordinate value y2 is supplied to the Y22 storage path 83 via the signal line 82 and is stored therein. It is assumed that the values y1 and y2 stored in these Y11 memory path 81 and Y22 memory path 83 remain unchanged unless there is a command from the main control circuit 31 again.

Y, the yI value stored in the storage circuit 81 is connected to the signal line 8
4' to the first Y comparison circuit 84, and the signal line 8
6 and is compared with a reference value Y, which will be described later, and y+
During the period of 7Y, the signal is outputted to the output signal line 87 of the Y comparison circuit 84 as an H level signal. Further, the y2 value stored in the Y22 memory path 83 is transferred to the second Y2 value via the signal line 85'.
It is supplied to the comparison circuit 85 and compared with the above-mentioned reference value Y, which is also supplied via the signal line 86, and when y2≧Y, it is output as an H level signal to the output signal line 88 of the Y comparison circuit 85. Ru.

The reference value Y mentioned above is determined by the television synchronization signal generation circuit 3 in FIG.
8 to the central inspection range output circuit 17 and the contour inspection range output circuit 18 through the output signal line 38'. be done.

That is, the TV vertical synchronization signal Sll is “L” (low).
From level 160 to “H” (high) level starting point 16
1 and then reaches the 'H' level 162, the horizontal synchronizing signal within the period of the 'H' level 162 is sequentially counted from the 'H' level starting point 161 by a counting circuit (not shown). , and the Y comparison circuit 84 and the Y comparison circuit 8 through the signal line 86 using the counted value as a reference value Y signal.
Supply to 5. In addition, L level 1 of the TV vertical synchronization signal
During the period of 60, the counting is stopped and at the same time the count is set to zero. In other words, the H of the TV vertical synchronization signal is set for each field.
During the level, a signal that repeats counting the television horizontal synchronization signal from zero to n is output as Y.

As a result, in the Y comparator circuit 84, an "H" level signal appears on the Y output signal line 87 while y1≦Y. Further, in the Y comparison circuit 85, an "H" level signal appears on the output signal line 88 while y2≧Y. The signals appearing on the signal lines 87 and 88 are ANDed by an AND circuit 89, and the y1 value ~
During the y2 value, it is outputted to the signal line 90 as a signal at "H" level as shown by 513 in FIG.

In Fig. 7 (1)), the points for determining the inspection range in the horizontal direction are: coordinate value Xl of point 66 + coordinate value Xl of point 68
2 + Arc data Z l + 2 +... Specifying the value of Zn and the storage address of the first data of the arc data, further specifying the inspection pattern, and dividing the frequency of the TV horizontal synchronizing signal to determine the output interval pitch of the arc data. There is a value specified. The coordinate value x1 of the point 66 is transmitted from the main control circuit 31 to the signal line 96.
(FIG. 8) and stored in the storage circuit 97. The coordinate value X2 of the point 68 is supplied from the main control circuit 31 through the signal line 114 (FIG. 8), and is sent to the x22 memory path 1.
13.

It is assumed that the stored values stored in these X1 storage circuit 97 and X2 storage circuit 113 remain unchanged unless new data is supplied from main control circuit 31 again.

Also, the coordinate value X stored in the X1 storage circuit 97.

is supplied to the X1 counter 99 of the up/down counter with preset via the signal line 98.

In the X1 counter 99, the coordinate value X is 5 in FIG.
The inverted signal of the television horizontal synchronization signal shown in 12 and 5 in FIG.
It is preset in synchronization with the one-shot pulse signal shown at 515 in FIG. 9, which is output by the rising edge of the pulse signal shown at 514 in FIG. 9, which is an AND output with the vertical direction inspection range signal shown at 13.

Similarly, the coordinate value x2 stored in the X2 storage circuit 113 is also preset in the X2 counter 109 through the signal line 112 in synchronization with the one-shot pulse signal 515. It is assumed that the pulse width of the pulse signal 514 and the one-shot pulse signal 515 is wider than that of the pulse signal 514.

The arc data Zl * Z2 +・ shown in Fig. 7(D)
...The distance value from Zn, that is, the coordinate value X of point 68, to the edge is stored in advance in the arc data Z storage circuit 136.
zl * Z2 +...Zn are stored in order. If the starting address of the arc storage data stored in this Z storage circuit 136 is, for example, address α, the value at address α is transmitted from the main control circuit 31 to the signal line 131 shown in FIG. is memorized.

Note that the value stored in the α storage circuit 132 remains unchanged unless commanded again from the main control circuit 31.

Data at address α stored in α storage circuit 132 is supplied to α counter 134 through signal line 133.

This α counter 134 is an up counter with a preset function, and the data at the α address of the α storage circuit 132 is preset during the "L" level period of the vertical direction inspection range signal shown at 513 in FIG. The output terminal of the α counter 134 is connected to the address input terminal of the arc data Z storage circuit 136 through a signal line 135, and when data at address α is input from the α counter 134, the arc data Z storage circuit 136 is connected to the address input terminal of the arc data Z storage circuit 136. Arc data Zl stored in the circuit 136
+Z2+ . . . Of Zn, the value z at address α is output to the output signal line 137 and supplied to one input terminal of the Z comparison circuit 138. This value of 21 is supplied to the Z counter 14 through the signal line 139 in the Z comparison circuit 138.
It is compared with a count value of 0. In addition, Z counter 14
The operation of counting 0 will be described later.

From the Z comparison circuit 138, the arc data Z storage circuit 136
When the count value of the Z counter 140 is greater than or equal to the output value of the
An output signal that becomes "H" level when the output value is smaller than the output value of is output to the signal line 141.

The output from the Z comparison circuit 138 via the signal line 141 is supplied to one input terminal of the 4-way AND circuit 145. The other input terminal of the AND circuit 145 receives a high frequency clock pulse shown at 516 in FIG. 9 through the signal line 142, a vertical inspection range signal shown at 513 in FIG. 9 through the signal line 90', and a signal line The TV horizontal synchronization signal is manually input through 143. The AND output of these four signals is input to the count pulse input terminal of the Z counter 140 through the signal line 130, and in response to this input, the Z counter 140
A counting operation is performed at the period of the high frequency clock pulse shown at 516 in the figure. The output of AND circuit 145 is also supplied to AND circuits 126 and 127.

A television horizontal synchronizing signal is input to the Z counter 140 through a signal line 143, and the count value of the 2 counter 140 is forcibly flattened when the waveform shown at 512 in FIG. 9 is at the "L" level.

That is, the Z counter 140 detects that when the vertical direction inspection range signal 513 is at the "H" level and the output of the Z comparison circuit 138 is at the "H" level (that is, the count value of the Z counter 140 is the data from the arc data Z storage circuit 136). ), and the TV horizontal synchronization signal of 512 is “H”.
``During the level period, a counting operation is performed in synchronization with the 516 high frequency clock signal.

During such counter operation, the Z counter 140
The count value is sent to the Z comparison circuit 138 through the signal line 139.
and is constantly compared with the data in the arc data Z storage circuit 136. Then, when the count value of the Z counter 140 becomes equal to the data of the arc data Z storage circuit 13 [i, or when the count value of the Z counter 140 becomes larger, the output side signal of the Z comparison circuit 138 An "L" level signal is output to line 141, and AND circuit 145 is disabled. When the AND circuit 145 is disabled, no count pulse signal is output from the output side of the AND circuit 145, and the counting operation of the Z counter 140 is stopped. However, when the horizontal synchronizing signal 512 supplied from the signal line 143 becomes "L" level again, the count value of the Z counter 140 becomes zero, so the data of the Z counter 140 is again calculated from the data of the arc data storage circuit 136. The count value becomes small and the Z comparison circuit 138 output becomes “H”
level, and the Z counter 140 restarts the counting operation due to the output of the AND circuit 145 which is turned "ON".

In this way, the second counter 140 repeats the counting operation as many times as the horizontal synchronizing signal occurs during the period when the vertical inspection range signal 513 is at the "H" level, and this operation is repeated for each field. .

While the above counting operation is being repeated,
Since the reading of the arc data (z, , z, z, , -Zn) stored in the Z storage circuit 136 for arc data must be sequentially changed according to the vertical position, that is, the period of the television horizontal synchronization signal, Z storage circuit 13 for arc data
As a signal that periodically changes the count value of the α counter 134 that specifies the read address of 6, a pulse obtained by dividing the frequency of the television horizontal synchronizing signal as shown at 517 in FIG. 9 is supplied to the α counter 134 through the signal line 146. .

The α counter 134 is preset by being supplied with the address value stored in the α storage circuit 132 via the signal line 133 while the vertical inspection range signal in S13 is at the ``L'' level. That is, before the vertical inspection range signal for each field reaches the H level of 513, the α storage circuit 132
The value of is preset.

The count pulse signal of the α counter 134 is the signal line 1
46 from the television horizontal synchronization frequency divider circuit 144. The frequency division value of the television horizontal synchronization frequency divider circuit 144 can be specified from the main control circuit 31 via the signal line 144'.
Once the same frequency division value is designated, it remains unchanged unless the main control circuit 31 designates the frequency division value again.

For example, if the specified frequency division value mentioned above is 2, the signal line 1
43 to the television horizontal synchronization frequency divider circuit 144,
During the H level period of the human input, the vertical inspection range signal manually input through the TV horizontal synchronization divider circuit 144 divides the frequency by 172 to become a signal as shown at 517 in FIG. 9, which is output to the output signal line 146. It is supplied to the count pulse input terminal of the α counter 134. The α counter 134 sequentially counts up in response to this signal 517, sequentially designates the addresses of the arc data in the Z storage circuit 136, and The arc data within is supplied to one input terminal of the Z comparison circuit 138 through the signal line 137, and
The count value output from the Z counter 140 is sequentially compared with the count value output from the Z counter 140 supplied through 39.

Here, the frequency division value of 2 means that the arc data is sequentially set every two trees using the television horizontal synchronization signal, that is, the number of television scanning lines. Therefore, the arc data in the arc data storage circuit 136 is also stored in accordance with the frequency division value. Further, the frequency division value is appropriately set depending on the curvature of the outer diameter of the lens to be inspected, but generally, when the lens radius is large, the frequency division value is set large, and when the lens radius is small, the frequency division value is set small. By appropriately setting the frequency division value according to the size of the lens radius in this way, the number of circular arc data can be minimized, and the storage capacity of the circular arc data Z storage circuit 136 can also be reduced. .

As described above, the arc data (Zl + Z2 +...Z
The number of pulses corresponding to n) is outputted to the output signal line 130 of the AND circuit 145 via the Z comparison circuit 138, and the path through which the arc data pulse signal is output is selected and determined based on the inspection range pattern. The path selection based on this inspection range pattern is performed by AND circuits 126 and 127, as will be described later.

147 is a pattern selection decoder, and the signal line 147
' is specified by the main control circuit 31 through
A), (B), (C), (D), (E
) Output pattern selection decoder outputs corresponding to the inspection range patterns respectively shown in FIG. For example, if the pattern selection is ■, the pattern shown in FIG. 6(A) is specified. The output of the pattern selection decoder 147 is any one of
Only one pattern can be specified, and once one pattern is selected, the pattern selected once will continue to be selected unless another pattern is specified again from the main control circuit 31.

For example, when the inspection range pattern shown in FIG.
An "H" level signal is supplied to the AND circuit 126 via the signal line 123, and an "H" level signal is supplied to the AND circuits 124 and 125 via the signal line 123.
AND circuit 126°124.125 is selected. As a result, the pulse (arc data pulse) corresponding to the arc data supplied from the output signal line 130 of the AND circuit 145 passes through the AND circuit 126, the signal line 120 and the AND circuit 124, and the signal line 110 to the X
The signal is supplied to the count up input terminal of the X2 counter 109 and counted by the X2 counter 109.

Immediately before the start of counting, the Xl counter 109
During the "H" level period of the one-shot pulse signal in S15, the coordinate value X of point 68 shown in FIG. 7(D) becomes X2.
Since it is supplied from the memory circuit 113 and is preset, for example, when counting arc data pulse 2,
As a result, the count value of the x2 counter 109 becomes the data value (X2+ZI) which is the sum of both values.

Therefore, the signal of the added count value (X2 +Z+) is output from the Xl counter 109, and is supplied to one input terminal of the second X comparison circuit 106 through the signal line 108. In addition, at the other input terminal of the X comparison circuit 10B, an AND signal of the television horizontal synchronizing signal S12 and the high frequency clock signal 518 is connected to a signal that is sequentially counted from the starting point of the "H" level of the television horizontal synchronizing signal. Numerical signal
is supplied through the signal line 105, the signal of the above-mentioned added data value (X2 +Zl) and the above-mentioned count value signal X are compared in the X comparison circuit 106.

On the other hand, the X8 counter 99 is preset with the coordinate value x1 of the point 66 stored in the x11 memory path 97 during the "H" level period of the one-shot pulse signal in S15, and subsequent pulse input is prohibited. Xl counter 9
The coordinate value x1 of the XI storage circuit 97 is input to the output signal line 102 of 9.
is outputted and supplied to the first X comparison circuit 103, where the coordinate value x1 is compared with the count value signal X described above supplied via the signal line 105.

A waveform 518 shown in FIG. 9 is an enlarged view of the television horizontal synchronization signal 512, and a waveform S19 is an enlarged view of the high frequency clock signal 516. S1
When the television horizontal synchronization signal of 8 and the high frequency clock signal of S19 are ANDed, a signal as shown at 520 in FIG. 9 is obtained. The count value signal X obtained by counting the signal of S20 is transmitted through the signal line 105 to the X comparison circuits 103 and
06. This S20 signal count is S
When the 12 television horizontal synchronizing signals are no longer at the ``L'' level, they are forcibly reset to flat. Then, when the television horizontal synchronizing signal becomes "H'" level, counting is performed again. In other words, 1 of the TV horizontal synchronization signal
A count value signal X is output in which a count from 0 to n is repeated for 520 signals in synchronization with the television horizontal synchronization signal every cycle.

The first X comparison circuit 103 compares X, the coordinate value X output from the counter 99, and the count value signal X described above, and when the coordinate value x1 is smaller than or equal to the count value signal X, An H" level signal is output to the signal line 104. In the second X comparison circuit 106, the Xl counter 109
The data value (X2+ZI) outputted from the signal line 10 is compared with the count value signal
7 outputs an "H" level signal. These signal lines 1
The signals output to 04 and 107 are sent to the AND circuit 115.
A logical AND is performed at , resulting in a signal as shown at 521 in FIG. The time for the signal 521 outputted to the output signal line 118 of the AND circuit 115 to change from the "H'" level to the "L" level is determined by the count output data value (X2 + ZI) of the x2 counter 109, and therefore the arc It will change depending on the data.

Similar operations are performed when other patterns shown in FIGS. 6(C), (D), and (E) are selected. However, when the patterns shown in FIGS. 6(D) and (E) are selected, an additional value appears on the x1 counter 9g, and x
The preset coordinate value x2 appears on the 2 counter 109 as an output value.

The signal that determines the horizontal inspection range that is output to the signal line 116 of the AND circuit 115 is input to one input terminal of the AND circuit 91 in the next stage, and in this AND circuit 91, it is sent to the other input terminal through the signal line 90. is ANDed with a signal that determines the vertical inspection range provided to the . As a result, the output signal line 92 of the AND circuit 91 has a two-dimensional inspection range in the horizontal and vertical directions, that is, as shown in FIG.
An inspection range signal as shown at 522 in FIG. 9 is obtained which determines the inspection range pattern shown in B) and (D).

An inspection range signal (522) that determines a two-dimensional inspection range output from the AND circuit 91 is supplied to one input terminal of the exclusive OR circuit 93 through a signal line 92. A switching signal is supplied to the other input terminal of the exclusive OR circuit 93 through a signal line 94.

In the exclusive OR circuit 93, in response to this switching signal,
" of the inspection range signal that determines the two-dimensional inspection range of S22
Determine whether the "H" level part is to be the inspection range or the range to be inspected.If the switching signal is now set to the "L" level, the "H" level part of the inspection range signal in S22 will be
It appears on the output side signal line 95 as a signal indicating the inspection range at the "H" level. On the other hand, when the switching signal is set to "H" level, the "H" level part of the inspection range signal of 522 is "
"H" level of the switching signal supplied through the signal line 94, and appears as a signal indicating the non-inspection range.
The setting of "level" or "L" level is performed by the main control circuit 31. Therefore, for example, in the case of FIGS. This will cause the switching signal on the signal line 94 to go to "L" level. Also, the output signal of the exclusive OR circuit 93 at this time will be the same as 522 in FIG. 9, and this signal will be at the center of FIG. It is output from the partial inspection range output circuit 17 to the output signal line 19.

A plurality of inspection range pattern generators shown in FIG. 8 that operate as described above are provided in each of the center inspection range output circuit 17 and the contour inspection range output circuit 18. By combining the range output signals, it is possible to set a more complex inspection range than that shown in FIG. 7(B), for example. At this time, the output signal line 20 of the contour inspection range output circuit 18 is connected to the output signal line 20 shown in FIG.
An inspection range signal corresponding to the inspection range pattern shown in is output.

These inspection range signals are connected to the respective signal lines 19 or 2.
0 to the corresponding AND circuit 21 or 22. In the AND circuit 21, the AND output of the center inspection range signal from the signal line 19 and the binarized signal from the signal line 16 is output to the signal line 23.

Also, in the AND circuit 22, the contour inspection range signal from the signal line 2G and the binarized processing signal 16 from the signal line 16
The logical product output is output to the signal line 24. The output of the AND circuit 21 is input to the center portion determination circuit 26, and the output of the AND circuit 22 is inputted to the contour portion determination circuit 27, and each determination circuit determines whether the lens is acceptable or not.

The center determination circuit 26 measures the H level time of the binarized signal within the center inspection range input from the signal line 23 using the real time of the video signal output, and determines whether the lens is acceptable or not based on the measured value.

FIG. 10 shows an example of the configuration of the center portion determination circuit 26 described above. The output of the AND circuit 21 shown in FIG. 3 is supplied to the signal line 170 through the signal line 23, the high frequency clock signal shown at 516 in FIG. 9 is supplied to the signal line 171, and the main A measurement start signal from the control circuit 31 is supplied.

The output of the AND circuit 21, the high frequency clock signal, and the measurement start signal are ANDed by the AND circuit 173, and the AND output is supplied to the T counter 175 through the signal line 174. As a result, the pulses obtained by dividing the binary signal within the center inspection range by the reference high frequency clock signal are input to the count input terminal of the T counter 175 at the same time as the start of measurement, and the T counter 175 counts these pulses. become.

In the T counter 175, the previous count value is cleared immediately before the start of measurement by a clear signal supplied from the main control circuit through the signal line 176. The count value signal output from the T counter 175 is sent to the comparator circuit 17 through a signal line 177.
8. At the same time, the comparison circuit 178 is supplied with a standard value signal from the main control circuit 31 through the signal line 179. In the comparison circuit 178, the above-mentioned count value signal and standard value signal are compared, and the count value signal is compared with the standard value signal (
When the signal becomes larger than the threshold signal (threshold signal), an "H" level signal is output to the output signal line 180 of the comparator circuit 178. this"
H” level signal indicates that the lens to be inspected 1 has defects exceeding the standard value.
This signal indicates that the object is located in the center of the area, and is determined to be defective. If the count value signal in the comparison circuit 178 is smaller than the standard value signal, an L level is output to the output signal line 180, and when it is at the L level, it is determined that the product is good. This signal line 18
The output signal from 0 is taken out from the center determination circuit 26 via a signal line 28 shown in FIG.

Note that the standard value signal supplied from the main control circuit 31 remains unchanged unless the main control circuit 31 supplies it again as a new standard value signal.

The contour portion determination circuit 27 determines the binarized signal time (width) of the contour portion of the binary signal within the contour portion inspection range every TV horizontal synchronization signal cycle, that is, every horizontal scan, and similarly determines the center portion of the image. Measure the actual time of the signal output, compare the time (width) with the width standard, and if it is outside the standard, the contour on that horizontal scanning line is determined to be defective.In the end, how many horizontal scanning lines were the contours determined to be defective? Make a pass/fail judgment.

FIG. 11 shows an example of the configuration of the contour portion determination circuit 27 shown in FIG. 3 described above. FIG. 12 shows the output waveforms of each part of the contour portion determination circuit 27.

In FIG. 11, a signal line 181 is supplied with the output of the AND circuit 22 shown in FIG.
A reference high frequency clock signal shown at 518 in the figure is supplied,
A measurement start signal from the main control circuit 31 is supplied to the signal line 183. The AND circuit 184 performs the logical product of these three signals, that is, the output signal of the AND circuit 22, the high frequency clock signal, and the measurement start signal.
The calculation result is sent to the T counter 186 via the signal line 185.
supply to. As a result, pulses obtained by dividing the binary signal within the contour inspection range by the reference high-frequency clock signal every horizontal scan are input to the count input of the T counter 186 at the same time as the start of measurement. Also, 53 in Figure 12
The output signal indicated by 3 is sent to the T counter 1 through the signal line 187.
86. This signal 533 corresponds to 512 in FIG.
and “” of the television horizontal synchronization signal shown at 531 in FIG.
The inverted signal of the one-shot pulse shown at 532 in FIG. 12, which is generated in synchronization with the fall of the "H" level to the "L" level, and the above-mentioned S12 and S3.
This is an AND output signal (AND output signal) with the inverted signal of the television horizontal synchronization signal shown by 1. This AND output signal S
33, the count value of the T counter 186 is cleared during the "H" level period. That is, the T counter 18B is reset every horizontal scanning period.

At the same time as the measurement starts, the count output value of the T counter 186, which counts the pulses obtained by dividing the binary signal of the contour inspection range by the reference frequency clock signal every horizontal scan, is supplied to the comparison circuit 189 through the signal line 188. . on the other hand,
The comparison circuit 189 is connected to the main control circuit 3 through a signal line 190.
The width standard value signal from 1 is supplied as an external input.

Comparison circuit 189 compares the output signal of T counter 186 and the width standard value signal.

The upper and lower limits of the width standard value can be set in this width standard value signal. Also, if the compared value is between this upper and lower limit, “
If the compared value is less than or equal to the upper limit, it is determined to be a “good” product, and if it is greater than or equal to the upper limit, it is determined to be “defective”. If the width is below the lower limit, the product is determined to be "good", and if it is below the lower limit, the product is determined to be "defective".It is possible to select and specify one of the three determination modes through the main control circuit 31. Once the values and determination mode settings are specified by the main control circuit 31 through the signal line 190, they remain unchanged unless the main control circuit 31 supplies data again.

The output of the comparison circuit 189 is taken out through a signal line 191 and supplied to one input terminal of an AND circuit 193 through the signal line 191. The output of the comparison circuit 189 outputs the "L" level when the product is determined to be "good" as described above, and outputs the "H" level when the product is determined to be "defective". The output of the signal line 191 is supplied to the AND circuit 193 through the signal line 192 at 532 in FIG.
A logical product is taken with the signal shown in , and the logical product output appears on the signal line 194. That is, the comparison result for each horizontal scanning period indicates that a defective portion exists within one horizontal scanning period. When the signal shown at 332 is at "H" level, the AND circuit 193
The signal appears on the output signal line 194 of the T counter 195, and is supplied to the count pulse input of the T counter 195 and counted.

The signal line 176 in FIG. 10 is connected to the T counter 195.
A signal similar to that from T counter 195 is supplied through signal line 196, and immediately before starting measurement, T counter 195 is reset to clear the count value.

The output of the T counter 195, that is, the count value of the number of scanning lines with defective parts (defective scanning line value) is the signal line 1.
The signal is supplied to a comparison circuit 198 through 97. On the other hand, the contour pass/fail determination standard value is supplied from the main control circuit 31 through a signal line 199 to the external input of the comparison circuit 198 . Once this standard value is given by the main control circuit 31, it remains unchanged unless another data is supplied from the main control circuit 31 again. The comparison circuit 198 compares the output count value (defective scanning line value) of the T-counter 195 with the above-mentioned contour pass/fail determination standard value, and the output count value of the T-counter 195 (former) becomes the contour pass/fail determination standard value (latter). When it is greater than the latter, an “H” level output is output to the output side signal line 200, and when the former is equal to the latter or the former is smaller than the latter, an “L” level output is output to the signal line 200. . That is, an "H" level signal is output to the signal line 200 when the product is defective, and a "L" level signal is output when the product is good.

The determination output of the signal line 180 in FIG.
It is output to the output signal line 28 of FIG. 6, and the signal line 20 of FIG.
The determination output of 0 is output to the output signal line 29 of the contour portion determination circuit 27, and is input to the OR circuit 30 in FIG. A determination result of a defective product is output to the output signal line 41, and if both determination outputs indicate a non-defective product, a determination result of a non-defective product is output to the output signal line 41.

Next, the overall operation will be explained.

The test starts when the operator gives a predetermined start command to the main control circuit 31 via a keyboard (not shown) or the like.

In the main control circuit 31, transmission and reflection inspection position data of the lens to be inspected and control values for each motor 2, 3, 4, 8 are stored for each inspection position. In addition, the center inspection range output circuit 17 and the contour inspection range output circuit 1
8 also stores inspection range data that matches the lens shape captured by the television camera 9 at each inspection position.

Prior to the inspection of the lens 1 to be inspected, the motors 2, 3, 4, and 8 that are not at the origin are driven by the command control of the main control circuit 31 to return to the origin, and as a result, the stages 2', 3' , base plate 1' and stage 8
’ position is set to the origin. Next, the main control circuit 31
As described above, since the inspection position data for transmission and reflection of the lens 1 to be inspected is stored in advance, the data is controlled by the main control circuit 31 to a predetermined transmission inspection position in the case of a transmission inspection, and to a predetermined transmission inspection position in the case of a reflection inspection. The motors 2, 3, .
4 and 8 are driven. At the same time, the motor 5 for rotating the lens is also driven to a certain number of rotations, for example 3.
The lens 1 to be inspected rotates at 600/n rpm (n - number of circumferential divisions). At this time, the illumination power supply switching circuit 39 is switched under the control of the main control circuit 31 depending on whether the lens 1 to be inspected is being inspected for transmission or reflection. Signal generation circuit 38 (5 in Figure 9)
11) Light emission is started in synchronization with the L level of the television vertical synchronization signal.

Now, in the case of a transmission inspection, when the lens 1 to be inspected is irradiated with light by the transmission illumination after it has moved to the transmission inspection position, a captured video signal is generated on the television camera 9. The video signal is supplied to the video signal binarization processing circuit 15 through the signal line 14, and the output signal after the binarization processing is inputted to each one input terminal of the AND circuit 21 and 22 through the signal line 16. At this time, if there is a defect such as a scratch on the lens 1 to be inspected, the output signals shown in S3, 54 and S5 in FIG. It is output from the value processing circuit 15.

FIG. 6 shows the operation of the AND circuits 21 and 22.

As already explained with reference to FIGS. 7 and 8, the center inspection range signal from the corresponding center inspection range output circuit 17 or the contour inspection range signal from the contour inspection range output circuit 18 is input. Since the signal is supplied as a signal, the AND circuits 21 and 22 perform a logical product of the input signal and the output signal from the video signal binarization processing circuit 15, and calculate the output signal within each inspection range corresponding to the lens shape. A signal corresponding to a defect such as a scratch is output.

The output signals of the AND circuits 21 and 22 are respectively supplied to the corresponding center portion determination circuit 26 or contour portion determination circuit 27, and as already explained with reference to FIGS. 10, 11 and 12, Lens determination processing is performed. A signal indicating the determination result of the center portion determination circuit 26 is supplied to the OR circuit 30 via the signal line 28, and a signal indicating the determination result of the contour portion determination circuit 27 is supplied to the OR circuit 30 via the signal line 29. Ru.

Here, when starting the measurement of the lens 1 to be inspected, the first
The center portion determination circuit 17 shown in the figure is supplied with a measurement start signal through a signal line 172, and the contour portion determination circuit 18 shown in FIG. 11 is supplied with a measurement start signal through a signal line 183. is at H level, AND circuit 1
Based on the video binarized signal inputted to 73, a process for determining the center or contour of the lens is performed. This measurement start signal includes an inspection period of a predetermined number of circumferential divisions of the lens 1 after the lens 1 to be inspected stops at a certain inspection position (for example,
n x TV 1 field period) at least “H”
In addition, when the lens 1 to be inspected is moving to the next inspection position, the measurement start signal becomes the "L" level. These center part determination processes and contour part determination processes are performed in parallel.

In this way, when a predetermined measurement of the lens 1 to be inspected at a fixed inspection position (for example, a transmission inspection position) according to a predetermined inspection mode is completed, the measurement start signal becomes "L" level, and the main control circuit 31 is commanded to the drive system controller 40 through the signal line 37, and the drive system controller 40 controls the motors 2, 3, 4, . and 8 to move the lens 1 to be inspected to the next inspection position and stop.

For example, when completing a transmission inspection and performing a reflection inspection in which the surface of the lens 1 to be inspected is irradiated with reflected light and inspected by the reflected image, when the measurement at the previous transmission inspection position is completed, A command is given from the main control circuit 31 to the illumination power supply/switching circuit 39 through the signal line, and the transmission inspection illumination device 1 is
Switching from the lighting of 1 to the lighting of the reflection inspection lighting device 12,
As a result, the transmission inspection illumination device 1 is turned off, and the reflection inspection illumination device 12 is started to emit light in synchronization with the vertical synchronization signal of the television synchronization signal generation circuit 38.

In addition, the main control circuit 3
1 to the center inspection range output circuit 17 and the contour inspection range output circuit 18 through the signal lines 34 and 35 to instruct predetermined inspection range data and inspection range mode data that match the inspection range at this time, respectively. The output side signal line 19 of the circuit 17 and the circuit 18 from the inspection range output signal
The signal is output to the output side signal line 20 and input to the AND circuits 21 and 22.

In this way, the AND circuits 21 and 22 take the AND circuit of the inspection range output signal corresponding to the set inspection range and the video signal binarized signal, and the result of the calculation is sent to the center part determination circuit 26 and the contour part determination circuit 26. It is input to the determination circuit 27, and the determination process is performed after stopping at the reflection inspection position in the same way as in the case of transmission inspection. In other words, the video signal 2 within the set inspection range
Value processing signals are taken out by AND circuits 21 and 22, and based on the logical product output, a decision is made as to whether the lens is acceptable or not in a center part judgment circuit 26 and an edge part judgment circuit 27, and the judgment result is sent through a signal line 41. taken outside. In this way, transmitted illumination and reflected illumination are alternately switched for one lens 1 to be inspected, measurement and determination processing are performed at each inspection position, and a pass/fail determination result is output.

Note that when inspecting one lens to be inspected, if it is possible to inspect only one side of the lens at each of the transmission inspection position and reflection inspection position due to the shape of the lens, the main control circuit 31 and the center inspection range output circuit 17 If data necessary for single-sided inspection is input in advance to the contour inspection range output circuit 18, only one side will be inspected in accordance with the data.

However, when inspecting the other surface of the lens 1 to be inspected, the lens 1 is inverted, and necessary data such as the inspection position and inspection range suitable for that lens surface are transmitted to the main control circuit 3. A similar test can be performed by using data that has been manually prepared in advance.

When the measurement and inspection of one lens 1 to be inspected is completed, each motor 2, 3, 4, and 8 is driven to return the stage etc. to the origin again and stop it. Next, the illumination device 11 for transmission inspection and the illumination device 12 for reflection inspection that are on is turned off, and the lens rotation motor 5 is also stopped, completing the inspection of one lens to be inspected.

In the embodiment of the present invention described above, when adjusting the focus of the television camera 9, the motor 8 is driven by control based on control data stored in advance from the main control circuit 31, and the entire television camera is moved in six motions. However, if an autofocus television camera is used as the television camera 9, the control of this part and the storage of control data become unnecessary. In addition, by inserting a color filter with a complementary color to the color of the coating film of the lens to be inspected in the light receiving section of the camera 9 or the illumination device (especially the illumination device 12 for reflection inspection), it is possible to prevent defects such as discoloration of the coating film. Defects can also be detected.

[Effects of the Invention] As explained above, in the present invention, 1
The inspection equipment on the stand can perform high-speed inspection of the entire surface, and can detect lens defects such as scratches on the material surface, material chips around the edge (contour), bubbles and cracks inside the material, and scratches in the coating film on the surface. It is capable of detecting various types of defects such as removal of the extreme parts of the film, particle size of the coating material, dirt, and dirt/fuss adhering to the lens, and automatically determines whether the lens is acceptable or not based on these detections. It can be done easily.

That is, according to the present invention, (1) Since the determining means for performing the pass/fail determination process for the lens is provided with two parts, one for the center part and one for the outline part, it is possible to eliminate
It is possible to reliably detect defects such as ink painting on edges to prevent reflection.

■ When we binarized the video signal obtained by imaging the lens to be inspected, we divided the video signal into two, delayed one part a little, and took the difference between the two. Only the defective portion can be extracted from the uneven amount of light received by the camera.

(2) Since inspection illumination is provided for transmission inspection and reflection inspection, one inspection device can detect not only defects in the lens material but also defects in the coating film on the lens surface.

■ Light for inspection is emitted in synchronization with the TV vertical synchronization signal, and the lens to be inspected is rotated at a predetermined rate, for example, 3600/nrp.
Since the lens rotates at a rotational speed of m (n=number of circumferential divisions), it is possible to inspect the lens for defects while continuously rotating the lens to be inspected. Furthermore, since the processing means can be constructed from a hardware circuit, the output video signal can be processed in real time, thereby enabling high-speed inspection.

■ Furthermore, it is equipped with a mechanism for moving and tilting the lens to be inspected in the horizontal and vertical directions, a mechanism for moving the television camera toward the focal point, and two parts for outputting the inspection range of the lens: the center part and the contour part. , it is possible to inspect lenses of various different shapes.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic configuration of an embodiment of the present invention, FIG. 2 is a perspective view showing the overall configuration of an embodiment of the present invention, and FIG. 3 is a block diagram showing the overall configuration of an embodiment of the invention shown in FIG. FIG. 4 is a block diagram showing an example of the configuration of the video signal binarization processing circuit shown in FIG. 3; FIG. 5 is a block diagram showing the circuit configuration of the electrical system; FIG. A waveform diagram showing the signal waveform and output timing of each part, Figures 6 (^) to (E) are explanatory diagrams showing the pattern of the inspection range, Figures 7 (A) to (D) are the lens shape and inspection 8 is a block diagram showing a configuration example of the inspection range pattern generator according to the embodiment of the present invention shown in FIG. 4, and FIG. 9 is an explanatory diagram showing the relationship with the range pattern. 10 is a block diagram showing a configuration example of the center portion determination circuit 26 in FIG. 4, and FIG. 11 is a configuration of the contour portion determination circuit 27 in FIG. 4. A block diagram showing an example. FIG. 12 is a waveform diagram showing signal waveforms and output timings of each part of the contour portion determination circuit 27 of FIG. 11. DESCRIPTION OF SYMBOLS 1... Lens to be inspected, 9... Television camera, 11... Illuminating device for transmission inspection, 12... Illuminating device for reflective inspection, 13... Television monitor, 15... Video signal binary 17... Center inspection range output circuit, 18... Contour inspection range output circuit, 21.22... AND circuit, 25.30... OR circuit, 26... Center part Judgment circuit, 27... Contour portion judgment circuit, 31... Main control circuit, 40... Drive system control circuit. Figure 5

Claims (1)

[Claims] 1) a) illumination means for illuminating a single lens, which is an object to be inspected, with transmission inspection illumination or reflection inspection illumination; and b) capturing an image of the lens illuminated by the illumination means. c) signal processing means for extracting a defect signal indicating a defect in the lens from the video signal; and d) a center portion and a contour portion of the image of the lens captured by the imaging device. e) an inspection range output means for outputting an inspection range divided into two parts; e) based on the defect signal output from the signal processing means within the inspection range output from the inspection range output means;
and a determining means for determining whether the lens is acceptable, f) the determining means, in real time of the video signal,
In the central part, the binarized signal time within the central part inspection range after processing the video signal is measured, and the measured binarized signal time is compared to see if it is within a predetermined reference time range or not. and at the contour portion, measure the binarized signal width of the contour portion for each television horizontal scanning line within the contour inspection range,
Comparing whether the measured binarized signal width is within a reference width range and further comparing whether the number of scanning lines outside the reference width range is within the reference scanning line number range to determine the pass/fail. In the pass/fail determination process for the center portion and the contour portion, when both are determined to be within the reference range, the lens is determined to be a good product, and when either of the center portion and the contour portion are determined to be outside the reference range, the lens is determined to be a defective product. A lens inspection device that is characterized by: