JP3359446B2 - Appearance inspection equipment for electronic components - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a visual inspection of electronic parts,
For example, the present invention relates to an apparatus for performing inspections such as whether or not dimensions are good and whether or not there is damage by image processing.

[0002]

2. Description of the Related Art FIGS. 9 (a) and 9 (b) show the overall configuration of a conventional visual inspection apparatus of this kind.

The device shown in FIG. 9A has two CCDs.
The inspection parts P are simultaneously imaged from different directions (upper surface side and lower surface side in the illustrated example) by the cameras 101 and 111, and image signals from the cameras 101 and 111 are taken into dedicated image processing devices 102 and 112, respectively. A predetermined inspection process is performed on the input image based on the signal, and the input images of the cameras 101 and 111 are displayed on the dedicated CRTs 103 and 113 together with the inspection results.

The apparatus shown in FIG. 9 (b) uses two CCD cameras 201 and 202 which can image the inspection part P from different directions (upper side and lower side in the illustrated example), and switches camera switching. The image signal from one of the cameras 201 (202) is taken into the image processing device 204 while performing the circuit 203, and based on this image signal, a predetermined inspection process is performed on the input image, and the image signal is used for inspection. One input image is displayed on the CRT 205 together with the inspection result.

[0005]

However, FIG.
The device shown in FIG. 1A requires a dedicated image processing device and a CRT for each camera, so that there is a problem that the device price increases according to the number of cameras. On the other hand, in the apparatus shown in FIG. 9B, only one image processing apparatus and one CRT are required, but it is necessary to perform imaging and inspection processing sequentially for each input image of each camera. And the inspection time increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object the purpose of providing an image processing apparatus and a CRT for each of which a plurality of images are fetched from one electronic component and its appearance inspection is performed. It is an object of the present invention to provide an appearance inspection apparatus that can perform an appearance inspection in a time that is the same as the inspection processing for one image, which requires only one unit.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a plurality of image pickup elements capable of simultaneously picking up an inspection part from different directions, and an image signal from each image pickup element in which all images are displayed on one screen. Image signal synthesizing means for synthesizing the image so as to be partitioned, image processing means for performing a predetermined inspection process on each image based on the image synthesized signal from the image signal synthesizing means, and A visual inspection device for electronic components equipped with image output means for displaying simultaneously
The image signal synthesizing means includes a horizontal / vertical synchronization signal.
And a horizontal / vertical synchronization signal
Horizontal / vertical cutoff that represents 1 / n of the horizontal / vertical scanning period from the signal
Pulse generation circuit that generates the
Image from each image sensor according to the time interval specified by the
An image signal for generating an image composite signal by sequentially switching image signals.
Signal switching circuit and convert this image composite signal to NTSC signal
And a signal processing circuit that has as its characterized by.

[0008]

[0009]

In the appearance inspection apparatus according to the present invention, horizontal and vertical
Horizontal / vertical representing 1 / n of the horizontal / vertical scanning period from the initial signal
A direct switching signal is generated, and the horizontal / vertical switching signal
Image signals from each image sensor in sequence according to the time interval
To generate an image composite signal, and convert this image composite signal to N
By converting to a TSC signal, the image from each image sensor
The image signal is matched so that all the images are partitioned on one screen.
Is performed by the image signal synthesizing means.
For each image based on the image synthesis signal from the
Inspection processing is performed by the image processing means, and all the images are
The image layout can be displayed simultaneously on the image output means.
Wear.

[0010]

[0011]

FIG. 1 shows the overall configuration of a visual inspection apparatus to which the present invention is applied, more specifically, a visual inspection apparatus using two cameras.

In FIG. 1, P is an inspection component, 1 and 2 are first and second cameras, 3 is a synchronization signal generation circuit, 4 is a synchronization signal separation circuit, 5 and 6 are pulse generation circuits, and 7 is an image signal switching. A circuit, 8 is an image memory, 9 is an image processing unit, 10 is a control unit, and 11 is a CRT. In this embodiment, the image memory 8,
The image processing device 12 is controlled by the image processing unit 9 and the control unit 10.
Is configured.

The first and second cameras 1 and 2 image the inspection component P from different directions (upper side and lower side in the drawing).
As shown in FIG. 2, each of the cameras 1 and 2 includes lenses 1a and 2
a, two-dimensional imaging devices 1b and 2b such as CCDs, signal processing circuits 1c and 2c, output circuits 1d and 2d, timing pulse generation circuits 1e and 2e, and a synchronization signal generation circuit 1.
f, 2f, and converts the image signals from the image sensors 1b, 2b into NTSC signals, and converts the converted image signals V
_1, V ₂ output terminal 1g, outputs from 2g.

Each of the cameras 1 and 2 has output terminals 1h and 2h for synchronizing signals and input terminals 1i and 2i, and can output horizontal and vertical synchronizing signals Hs and Vs of the built-in circuits 1f and 2f to the outside. , Horizontal / vertical synchronization signal H from outside
s and Vs can be fetched and used with priority. In this embodiment, since the external synchronizing method is adopted, horizontal and vertical synchronizing signals Hs and Vs are simultaneously input from the synchronizing signal generating circuit 3 to the cameras 1 and 2 respectively.

The synchronizing signal separation circuit 4 (in the illustrated example a first camera 1) one camera for separating a horizontal sync signal Hs and vertical sync signal Vs from the image signal V ₁ output from.
If the horizontal synchronizing signal Hs and the vertical synchronizing signal Vs are input directly from the synchronizing signal generating circuit 3 to the respective pulse circuits 5 and 6, the synchronizing signal separating circuit 4 can be omitted to simplify the device configuration. it can.

The pulse generation circuit 5 outputs a horizontal switching signal Ph as shown in FIG. 3A from the horizontal synchronizing signal Hs, that is, ON corresponding to a half cycle (1 / 2th) of the horizontal scanning cycle th.
A pulse signal having an area A and an OFF area B is generated.
The horizontal switching signal Ph may be a waveform other than the illustrated example, for example, a signal in which ON / OFF of each of the areas A and B is reversed, as long as it can represent a half cycle of the horizontal scanning cycle th.

The pulse generation circuit 6 turns on the vertical synchronizing signal Vs from the vertical synchronizing signal Vs to a vertical switching signal Pv as shown in FIG. 3B, that is, a half cycle (1/2 tv) of the vertical scanning cycle tv.
A pulse signal including a region C and an OFF region D is generated.
Note that the vertical switching signal Pv may be a waveform other than the illustrated example, for example, a signal in which ON and OFF of the regions C and D are reversed, as long as the signal can represent a half period of the vertical scanning period tv. In FIG. 3, for convenience, the horizontal scanning period th and the vertical scanning period tv are shown by the same waveform, but the actual horizontal scanning period th is shorter than the vertical scanning period tv.

The image signal switching circuit 7 includes a switching element for switching an input signal.
Depending on the area A to D of h and vertical switching signal Pv (time interval) sequentially switching the image signals V _1, V ₂ from the cameras 1 and 2, all the input images of these image signals V _1, V ₂ is one The image synthesized signal V is synthesized so as to be sectioned and arranged in the screen.
G is output to the image processing device 12. The combination of the image signals in the image signal switching circuit 7 will be described later in detail.

The image memory 8 constituting the image processing device 12
Captures and stores the image composite signal VG from the image signal switching circuit 7. The image stored in the memory is an image in which the input images of the cameras 1 and 2 are partitioned and arranged on one screen. The image processing section 9 reads the image data taken into the image memory 8 and performs various pre-processing such as binarization, and also performs inspections such as whether the dimensions are good or not and whether there is damage. Control unit 1
0 instructs the type and parameters of the pre-processing to the image processing unit 9 and performs data storage and management of inspection results and the like.

The CRT 11 simultaneously displays the input images of the cameras 1 and 2 together with the inspection result in the image processing device 12 in a predetermined partition arrangement. The image display on the CRT 11 will be described later in detail.

Here, a method of synthesizing an image signal and a display form of an input image will be described with reference to FIGS.

As shown in FIG. 4 (a), first displays an input image I ₁ of the camera 1 to the left half of the screen 11a of the CRT 11, when displaying the input image I ₂ of the second camera 2 the right half Uses the horizontal switching signal Ph of the pulse generation circuit 5 and captures the image signal V ₁ of the first camera 1 at a time corresponding to the ON area A of the horizontal switching signal Ph,
Operating the image signal switching circuit 7 to capture the image signal V ₂ of the second camera 2 at time corresponding to. The image composite signal VG output from the image signal switching circuit 7 is obtained by arranging the input images I ₁ and I _{2 of the} cameras ₁ and ₂ on the left and right sides of one screen, and displays each camera on the screen 11 a of the CRT 11. 1, 2 input images I ₁ and I ₂ are simultaneously displayed on the left and right.

Further, the second displays the input image I ₂ camera 2 on the left half of the screen 11a of the CRT 11, when displaying the input image I ₁ of the first camera 1 half right, ON horizontal switching signal Ph The image signal switching circuit 7 is operated so as to capture the image signal V ₂ of the second camera 2 in a time corresponding to the area A and capture the image signal V ₁ of the first camera 1 in a time corresponding to the OFF area B. I just need.

On the other hand, as shown in FIG.
The input image I of the first camera 1 is displayed on the upper half of the first screen 11a.
₁ is displayed and the input image I ₂ of the second camera 2 is displayed in the lower half.
The use captures the image signal V ₁ of the first camera 1 at the time corresponding to the ON area C of the vertical switching signals Pv, OFF
Operating the image signal switching circuit 7 to capture the image signal V ₂ of the second camera 2 at the time corresponding to the region D. The image composite signal VG output from the image signal switching circuit 7 is obtained by arranging the input images I ₁ and I _{2 of the} cameras ₁ and ₂ on the upper and lower sides of one screen, and displays each camera on the screen 11 a of the CRT 11. 1, 2 input images I ₁ and I ₂ are simultaneously displayed vertically.

Further, the input image I ₂ of the second camera 2 and displayed on the upper half of the screen 11a of the CRT 11, when displaying the input image I ₁ of the first camera 1 in the lower half, the vertical switch signal Pv the image signal V ₂ of the second camera 2 captures a time corresponding to the oN area C, it is and operates the image signal switching circuit 7 to capture the image signal V ₁ of the OFF region first camera 1 at the time corresponding to D Just do it.

A series of inspection processing in the image processing device 12 is performed based on the above-mentioned image composite signal VG, for each input image I ₁ ,
It is performed with respect to I _2. By arranging the two input images I ₁ and I ₂ on one screen, the resolution is slightly reduced.
There is no effect on inspection accuracy and no problem.

In the above-described visual inspection apparatus, the image signals V ₁ and V ₂ of the _two cameras ₁ and ₂ are combined so that all of these input images are partitioned and arranged on one screen, and the image combined signal V
A predetermined inspection process is performed on each of the input images I ₁ and I ₂ based on G, and the two input images I
_{Since 1} and I ₂ are simultaneously displayed on the CRT 11, even when the inspection part P is simultaneously imaged using the two cameras 1 and 2, only one image processing device and one CRT are required, and the inspection for one image is performed. Appearance inspection can be performed in the same time as processing.

FIG. 5 shows an example in which the camera of the above embodiment employs an internal synchronization method.

When a camera having a built-in synchronization signal generation circuit and input / output terminals for horizontal / vertical synchronization signals as a camera as in the above embodiment is used as a camera, as shown in FIG. By connecting the output terminal 1h of the first camera 1 (in the illustrated example) to the input terminal 2i of the second camera 2, it is possible to operate both cameras 1 and 2 in a synchronized manner. By omitting the signal generation circuit 3, the device configuration can be simplified.

FIG. 6 shows another configuration for obtaining an image composite signal similar to the above.

In the figure, reference numerals 21 and 22 denote 2 such as CCDs.
A dimensional imaging device, 23 is an image signal switching circuit, 24 is a signal processing circuit, 25 is an output circuit, 26 is a timing pulse generation circuit, 27 is a synchronization signal generation circuit, 28 and 29 are pulse generation circuits, and have the same names. The function is the same as that of the embodiment shown in FIG.

In this configuration, each of the image pickup devices 21 and 22 is operated in synchronization with the horizontal / vertical synchronization signal from the synchronization signal generation circuit 27, and the image signal of each image pickup device 21 and 22 is changed to the horizontal switching signal Ph and the vertical Using the switching signal Pv, the signal is first synthesized by the same method as described above, and is converted into an NTSC signal so that it can be output from the output terminal 25a.
In this way, there is no need to use two cameras having the same specifications as in the embodiment shown in FIG. 1, which is advantageous in terms of cost, and the configuration excluding the image processing device and the CRT can be simplified.

FIG. 7 shows a partial configuration of a visual inspection apparatus using four cameras for imaging inspection components.

In the figure, reference numerals 31 to 34 denote cameras, 3
5 is a synchronization signal generation circuit, 36 is a synchronization signal separation circuit, 3
Reference numerals 7 and 38 denote a pulse generation circuit, 39 denotes an image signal switching circuit, and the function of the same name portion is the same as that of the embodiment shown in FIG.

In this configuration, the image signals from the four cameras 31 to 34 are combined so that all of these input images are partitioned and arranged on one screen. And the four input images can be simultaneously displayed on the CRT 11 together with the inspection results.

For example, as shown in FIG. 8, displays the input image I ₃₁ of the camera 31 in the upper left 1/4 portion of the CRT screen 11a, and displays the input image I ₃₂ of the camera 32 in the upper right quarter segment When the input image I ₃₃ of the camera 33 is displayed in the lower left quarter and the input image I ₃₄ of the camera 34 is displayed in the lower right quarter, the horizontal switching signal P of the pulse generation circuit 37 is used.
h and the vertical switching signal Pv of the pulse generation circuit 38, both the ON area A of the horizontal switching signal Ph and the vertical switching signal Pv
The image signal of the camera 31 is captured at a time corresponding to the ON area C of v, and the image signal of the camera 32 is captured at a time corresponding to the OFF area B of the horizontal switching signal Ph and the ON area C of the vertical switching signal Pv. The image signal of the camera 33 is captured at a time corresponding to the ON area A of the signal Ph and the OFF area D of the vertical switching signal Pv, and the OF of the horizontal switching signal Ph is taken.
The image signal switching circuit 39 is operated so as to capture the image signal of the camera 34 at a time corresponding to the F region B and the OFF region D of the vertical switching signal Pv.

The image composite signal VG output from the image signal switching circuit 39 is the input image I ₃₁ of each of the cameras 31 to 34.
To become what I ₃₄ is partitioned arranged vertically and horizontally in one screen, the CRT screen 11a the input image I ₃₁ to I ₃₄ of the cameras 31 to 34 are simultaneously displayed vertically and horizontally. The regions A, B and the region C, and each input image I ₃₁ to I ₃₄ Combined appropriate D can be displayed in the desired position.

A series of inspection processing in the image processing apparatus is based on the above-described image composite signal VG, and the input images I _{31 to} I ₃₁
It is implemented for ₃₄ . By arranging the four input images I _{31 to} I ₃₄ in one screen, the resolution is slightly reduced.
There is no effect on inspection accuracy and no problem.

In the configuration shown in FIG. 7, it is possible to change each of the cameras 31 to 34 to the same internal synchronization system as in FIG. 5, but when the number of cameras is large, synchronization between the cameras is ensured. Therefore, it is preferable to employ the external synchronization method. Further, an image composite signal VG similar to that shown in FIG. 7 may have the same configuration as that shown in FIG. 6, that is, image signals from four image sensors may be combined first, and then converted into NTSC signals. .

In each of the above embodiments, the screen of the CRT is divided into two or four based on the horizontal / vertical switching signal. However, the size of the input image of each camera displayed on the CRT is as shown in FIG. 3) and the time ratio of the areas A and B shown in FIG.
The adjustment can be made by appropriately changing the time ratio between the regions C and D shown in FIG. Also, as the horizontal / vertical switching signal, 1/3, 1/4.
(N is an integer), the horizontal / vertical switching signal is used to convert at most n ² camera input images into a CRT.
Can be displayed simultaneously.

[0041]

As described in detail above, according to the present invention,
Even when a plurality of image pickup devices are used to simultaneously image an inspection component, only one image processing means and one image output means are required, and the appearance inspection can be performed in the same time as the inspection processing for one image. Also, the image signal from the image sensor is transmitted to the NTSC signal.
Using multiple cameras with signal processing circuits to convert signals
This eliminates the need for
Price can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a visual inspection device using two cameras.

FIG. 2 is a detailed view of the camera shown in FIG.

FIG. 3 is a diagram showing a horizontal / vertical synchronization signal and a horizontal / vertical switching signal;

FIG. 4 is a diagram showing an image display form on a CRT screen.

FIG. 5 is a diagram showing an example in which an internal synchronization method is adopted in the camera of FIG. 1;

FIG. 6 is a diagram showing another configuration for obtaining an image composite signal similar to that of FIG. 1;

FIG. 7 is a partial configuration diagram of a visual inspection device using four cameras.

FIG. 8 is a diagram showing an image display mode on a CRT screen.

FIG. 9 is a configuration diagram of a conventional visual inspection device.

[Description of Signs] P: inspection parts, 1, 2, camera, 3: synchronization signal generation circuit, 4: synchronization signal separation circuit, 5, 6: pulse generation circuit,
7 image signal switching circuit, 8 image memory, 9 image processing unit, 10 control unit, 11 CRT, 11a screen, V
₁ , V ₂ : image signal, Hs: horizontal synchronization signal, Vs: vertical synchronization signal, Ph: horizontal switching signal, Pv: vertical switching signal,
VG: image composite signal, I1, I2 ... images, 21, 22, ...
Image pickup device, 23 image signal switching circuit, 27 synchronization signal generation circuit, 28, 29 pulse generation circuit, 31, 32, 3
3, 34 camera, 35 synchronization signal generation circuit, 36 synchronization signal separation circuit, 37, 38 pulse generation circuit, 39
Image signal switching circuit, I ₃₁ , I ₃₂ , I ₃₃ , I ₃₄ ...

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G06T 1/00 305 G01N 21/88 H04N 7/18

Claims (2)

(57) [Claims] A plurality of image pickup elements capable of simultaneously picking up an inspection component from different directions; an image signal synthesizing means for synthesizing image signals from the respective image pickup elements such that all images are partitioned and arranged on one screen; Appearance inspection of an electronic component comprising: an image processing unit that performs a predetermined inspection process on each image based on an image synthesis signal from the image signal synthesis unit; and an image output unit that simultaneously displays all the images in the above-described partition arrangement. On the device
The image signal synthesizing means generates a horizontal / vertical synchronization signal.
Synchronization signal generator circuit and the horizontal and vertical synchronization signals
A horizontal / vertical switching signal representing 1 / n of the flat / vertical scanning cycle
The generated pulse generator circuit and this horizontal / vertical switching signal
The image signal from each image sensor is output according to the specified time interval.
An image signal switching circuit for sequentially switching to generate an image composite signal
And a signal for converting this image composite signal into an NTSC signal
A visual inspection device for an electronic component, comprising: a processing circuit . 2. The image output means includes an image together with all the images.
2. The electronic component appearance inspection device according to claim 1, wherein an inspection result in the processing unit is displayed .