JPH05340889A - Method and device for displaying monitoring picture of object - Google Patents

Abstract

PURPOSE:To obtain a high-resolution monitoring picture by dividing the screen of a monitor into monitoring areas, the number of which corresponds to the number of image pickup devices, by dividing the screen by drawing diagonal lines and separately displaying each picture in corresponding to the monitoring areas. CONSTITUTION:The image of the mounting device of an IC 1 is picked up with TV cameras 3a-3d at prescribed inspecting points and video signals from the cameras 3a-3d are respectively inputted to the corresponding switches 9a-9d in a switch section 9. The turning-on and turning- off of the switches 9a-9d are controlled by means of switch control signals from a picture switching signal generator 6 which outputs the control signals based on timing signals from a synchronous signal generator 5. The output signals of the section 9 are amplified at an operational amplifier 10 and inputted to a monitor 7 after their output impedances are lowered by means of a buffer amplifier 11. Then the output signals are displayed on the displaying screen 8 of the monitor 7 in such a way that the signals are respectively displayed in monitoring areas 8a-8d divided by drawing black diagonal lines L1 and L2 as boundary lines in corresponding to the inspecting points at which the image of the mounting device is picked up with the cameras 3a-3d so that a synthesized picture can be displayed as a whole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for displaying an image on a monitor display screen when an inspection point of an object is displayed on a monitor, and more particularly to a mounting position of a mounting component mounted on a printed circuit board. Used to inspect.

[0002]

2. Description of the Related Art Generally, a pattern for forming a circuit network by forming a copper foil on a printed circuit board 50 is formed. On the other hand, as shown in FIG. 6, an IC chip (hereinafter, referred to as IC51) which is a mounting component 51 mounted on the printed circuit board 50.
The chip size is very small. Besides, I
The number of lead wires 52 of C51 is large, and in addition, lead wires 52 having a lead wire pitch interval of about 0.2 to 0.3 mm are being mounted. Therefore, the IC 51 can be accurately placed at the mounting position of the pattern formed on the printed circuit board 50.
Mounting and soldering is an important production technology factor.

Therefore, conventionally, the printed circuit board 50 is positioned on an XY table (not shown), and the IC 51 is mounted on the printed circuit board 50 by a device that stores the mounting position of the IC 51. There is. That is, the position data of the IC 51 is created and mounted on each printed circuit board 50. However, even if a highly accurate device is used, it is difficult to position the IC 51 and the mounting position is displaced. Therefore, the I mounted on the printed circuit board 50
An inspection process is provided before and after the soldering process in order to determine whether or not the position of C51 is accurate.

In such a case, the first method is I
In a mounted component such as C51, the lead wire 52 has a narrow pitch interval and is difficult to be inspected with the naked eye. Therefore, in general, an inspector visually inspects with a magnifying glass or a magnifying lens. The inspector holds a small TV camera equipped with a hand in a magnified image of the inspection location and displays it on the monitor screen for inspection. As a second method, it is possible to inspect using a high-resolution TV camera having 1000 or more scanning lines.

As a third method, as shown in FIG. 6, in order to image the mounting position of the IC 51, a low-cost image pickup apparatus 53 having a normal number of scanning lines of 525 is provided.
While arranging four (hereinafter referred to as TV cameras),
This TV camera 53 (53a, 53b, 53c, 53
A monitor 54 displaying the images captured in d).
(54a, 54b, 54c, 54d) are arranged and shown in FIG.
, The TV cameras 53a, 53b ...
There is a method of enlarging and displaying the images respectively taken on the display screen 56 of the monitors 54a, 54b ,. Further, as a fourth method, as shown in FIG.
Split display unit 55 for video signal from V camera 53
There is also a method of storing the image in a memory (not shown), reading it out, reducing each image to 1/4, and dividing it into four rectangles on the display screen 56 of one monitor 54 and displaying it.

[0006]

Problems to be Solved by the Invention In the first method, there are problems in that the degree of defect detection varies depending on the inspector, and the inspection rate decreases due to the decrease in efficiency due to fatigue. In the second method, a high-resolution TV camera is very expensive, and there is a problem that the cost becomes high, and
There is a problem that the entire image of the lead line 52 of the IC 51 cannot be observed in detail.

In the third method, as many monitors 54 as the number corresponding to the TV cameras 53 are required.
As shown in FIG. 6, the inspection area of one IC 51 is divided and displayed on each of the four monitors 54, so that the inspector's observation range is widened and causes fatigue. In addition, it is difficult to grasp the whole picture of the IC 51. In the fourth method, four TV cameras 5
Since the image of No. 3 is reduced and displayed on one monitor TV 54 in a divided manner, the resolution is reduced to 1/4, and the display screen 56 on the monitor TV 54 becomes discontinuous as shown in FIG. Similar to the above method, there is a problem that it is difficult to intuitively grasp the entire image of the IC 51.

[0008]

According to the present invention, a plurality of inspection points of an object are determined, each inspection point is imaged by a number of image pickup devices corresponding to the inspection points, and a display screen of a monitor is displayed. The screen is divided by diagonal lines and divided into a number of monitor regions corresponding to the number of image capturing devices, and each image from each image capturing device is selected, and only images in regions corresponding to each monitor region are selected. By dividing and displaying each of the selected images in correspondence with the monitor area, an image with high resolution can be obtained.

Further, a number of image pickup devices corresponding to the inspection points for picking up a plurality of inspection points of the object, and a synchronization signal generator for outputting a timing signal for synchronizing the plurality of image pickup devices, An image switching signal generator that outputs a switch control signal for switching and displaying a video signal from the image pickup device to a monitor area divided by diagonal lines on the monitor display screen under the control of a timing signal, and a switch control A switch unit that switches the video signal from the image pickup device according to the signal and a monitor that divides and displays each video signal from the switch unit in correspondence with the monitor areas divided by diagonal lines on the monitor display screen. A good image display device is configured.

[0010]

The four image pickup devices pick up images of respective predetermined inspection points of the object. Each video signal from each imaging device is
In order to switch and display in a monitor area divided by diagonal lines on the monitor display screen, each image pickup device corresponding to each monitor area is switch-controlled in a switch section controlled by a switch control signal using a timing signal as a reference signal. Only the images of are selected. The selected video signal is divided and displayed on the display screen of the monitor in correspondence with the monitor areas divided by diagonal lines.

[0011]

Embodiments of the present invention will be described in detail with reference to FIGS. 1 is a configuration diagram showing an embodiment of the present invention, FIG. 2 is a diagram for explaining the relationship between an IC as an object 1 and a display screen 4 of each image pickup device 3, FIG. 3 is a time chart diagram, FIG. 4 is a detailed configuration diagram of the image switching signal generator 6, and FIG. 5 is an explanatory diagram for creating the monitor areas 8a to 8d. 1 and 2, reference numeral 1 denotes an object, and in this embodiment, in order to inspect whether the IC mounted on the printed circuit board 2 is accurately positioned at the mounting position,
Four inspection points are set (hereinafter referred to as IC1). Reference numeral 3 denotes an image pickup device (hereinafter, referred to as a TV camera) having a magnifying function. In this embodiment, four TV cameras 3a,
3b, 3c, 3d are used, and this TV camera 3
a to 3d are lead wires 1a of IC1 as shown in FIG.
Are arranged at four inspection points in order to capture an image of whether or not they are accurately positioned on the pattern 2a on the printed circuit board 2.

Reference numeral 5 denotes a sync signal generator, as shown in FIG. 3, which is a horizontal sync signal T _0H which is a timing signal for externally synchronizing four TV cameras 3 (3a, 3b, 3c, 3d) and a vertical sync signal T _0H. It outputs the synchronization signal T _0V . An image switching signal generator 6 comprises a horizontal counter 13, a vertical counter 14, an area and boundary generator 15, and four AND gates 16 as shown in FIG. The image displayed on the display screen 8 of 7 is divided into four monitor regions 8a, 8b, 8c and 8d divided by diagonal lines L ₁ and L ₂ , respectively, so that the switch unit 9 is controlled. Outputs a control signal. The switch unit 9 includes four TV cameras 3 (3
a to 3d), each of which has switches 9a, 9b, 9c, 9d9e which are analog switches,
Under the control of the switch control signal from the image switching signal generator 6, the switches 9a to 9d are sequentially switched and controlled, and the video signals from the TV cameras 3 are respectively displayed on the display screen as shown in FIG. The video signal is selected so that the image corresponds to 4 (4a to 4d). The switch 9e is a switch for displaying a border line, and in this embodiment, it is displayed in black when the switch 9e is on. Reference numeral 10 is an operational amplifier, and 11 is a buffer amplifier.

Next, the operation will be described. As shown in FIG. 2, the printed circuit board 2 is positioned and placed on an XY table (not shown), and the IC 1 is mounted at the mounting position on the printed circuit board 2. .. The four TV cameras 3 are externally synchronized by the timing signals T _0H and T _0V from the synchronization signal generator 5.
Now, the mounting position of this IC 1 is the TV cameras 3a, 3b,
Predetermined inspection points are imaged by 3c and 3d, and the video signals from the TV cameras 3a to 3d are switched by the switch 9a.
Enter in ~ 9d.

On the other hand, as shown in FIG. 3, the timing signals T ₁ and T ₂ are generated by the image switching signal generator 6 as a basic signal of a switch control signal for controlling the switch section 9, Each switch 9a to 9 of the section 9
d is the timing signals T _0H and T 0 from the synchronization signal generator 5.
On / off control is performed by a switch control signal from the image switching signal generator 6 with _0V as a reference.

Here, as a method of dividing the display screen 8 of the monitor 7 by the diagonal lines L ₁ and L ₂ , in this embodiment, as shown in FIGS. 4 and 5, the image switching signal generator 6 is
It has a horizontal counter 13, a vertical counter 14, a region and boundary line generator 15, and as can be seen from the time chart shown in FIG. 3, the timing signal from the sync signal generator 5 (vertical sync). Signal) T _0V and timing signal (horizontal synchronizing signal) T _0H as reference signals, the timing signal T ₁ of the horizontal counter 13 causes the video signal to be 1 for each of the scanning lines H ₁ , H ₂ , H ₃ ...
Every time the pulse time, the 2 pulse time, the 3 pulse time, etc. is turned on, the switch 9e is turned on to cut the video signal and display the so-called black portions of the diagonal lines L ₁ and L ₂ , so that the diagonal line L ₁ becomes a boundary. Created in the line generator 15,
As shown in FIG. 5, the regions A and B are divided on both sides of the diagonal line L ₁ as a boundary line. Similarly, the diagonal line L ₂ is created by the boundary line generator 15 in accordance with the timing signal T ₂ of the horizontal direction counter 13, and the regions C and D are divided on both sides of the diagonal line L ₂ as a boundary line. In this way, the boundary line indicated by the diagonal lines L ₁ and L ₂ is the switch 9
When e is on, it is displayed in black. In addition, the switch 9e determines whether the black display or the white display is performed.
It is determined by the on / off control voltage.

Regions A and B divided by the diagonal line L ₁ and regions C and B divided by the diagonal line L ₂ thus created
When the signals respectively forming D and D are input to the AND gate 16, the area a displayed by the TV camera 3a becomes the area A.
Is "1" and the area C is "1". Similarly, the area b displayed by the TV camera 3b is the area when the area B is "1" and the area C is "1".
In the area c displayed by c, the area B is "1" and the area D is "".
The area at the time of 1 ", the area d displayed by the TV camera 3d is
When the area A is "1" and the area D is "1", the signals of the areas are output. The output signals are input to the switch unit 9 as switch control signals, and the switches 9a to 9d.
And 9e are on / off controlled.

Therefore, by the switch control signal, as shown in the explanatory view of FIG. 2, in the switch section 9, the video signal of the TV camera 3a is displayed in the area a shown on the display screen 4a.
Only the selected areas are erased and the other areas b, c and d are erased. Similarly, for the video signal of the TV camera 3b, only the area b shown on the display screen 4b is selected, and the TV cameras 3c and 3d are selected.
For the video signal of, the areas c and d shown on the display screens 4c and 4d are selected. In this way, the video signal from each TV camera 3 is switched, and the diagonal lines L ₁ and L ₂ are switched.
The video signals of the four areas divided by are selected respectively. On the other hand, the switch 9e is turned on / off by a switch control signal from the image switching signal generator 6, and a signal indicating a boundary line is output to the boundary line output terminal 17. The respective output signals from the switch section 9 thus obtained are amplified by the operational amplifier 10, and the output impedance is lowered by the buffer amplifier 11, and the monitor 7
To the TV camera 3a on the display screen 8.
~3d with corresponding to the inspection point captured is displayed on the monitor area 8a~8d Segmented by diagonal lines L _1, L ₂ being black display indicating the boundary, the synthesized image is displayed as a whole ..

[0018]

According to the present invention, a plurality of inspection points of an object are determined, the inspection points are imaged by the image pickup devices corresponding to the inspection points, and the monitor display screen is divided by diagonal lines of the display screen. Then, the images are divided into a number of monitor regions corresponding to the number of image capturing devices, and each image from each image capturing device is selected, and only the images in the regions corresponding to each monitor region are selected. Since the images are divided and displayed in correspondence with the respective monitor areas, the resolution of the composite image displayed on the display screen does not deteriorate and a clear and good image can be obtained. In addition, since the display screen on the monitor is displayed as if it were continuous, it is possible to intuitively grasp the entire image of the object.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 shows an embodiment of the present invention, and is a monitor area obtained when four inspection devices image the inspection points of an object.

FIG. 3 is a time chart showing an embodiment of the present invention.

FIG. 4 is a detailed configuration diagram of an image switching signal generator 6 according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram for creating monitor areas 8a to 8d in the embodiment of the present invention.

FIG. 6 shows a conventional example, which is a monitor region obtained when four inspection devices each image an inspection location of an object.

FIG. 7 is a configuration diagram showing a conventional example.

FIG. 8 is a configuration diagram showing a conventional example.

[Explanation of symbols]

1 Object 3 Imaging Device 5 Synchronous Signal Generator 6 Image Switching Signal Generator 7 Monitor 8 Display Screen of Monitor 7 8a-8b Monitor Area 9 Switch Section L ₁ Diagonal Line L ₂ Diagonal Line T _0H Timing Signal (Horizontal Synchronous Signal) T _0V Timing signal (vertical sync signal)

Claims (2)

[Claims] 1. A plurality of inspection points for an object are defined, each inspection point is imaged by a number of image pickup devices corresponding to the inspection points, and a display screen of a monitor is divided by diagonal lines of the display screen. The image is divided into a number of monitor regions corresponding to the number of image capturing devices, and each image from the image capturing devices is selected, and only the images in the regions corresponding to the respective monitor regions are selected. A method for displaying a monitor image of an object, characterized in that images are divided and displayed in correspondence with the monitor areas. 2. A number of imaging devices corresponding to the inspection points for imaging a plurality of inspection points of an object, and a synchronization signal generator for outputting a timing signal for synchronizing the plurality of imaging devices. An image switching signal generator that outputs a switch control signal for switching and displaying a video signal from the image pickup device to a monitor area divided by diagonal lines of a monitor display screen under the control of the timing signal, A switch unit for switching the video signal from the image pickup device according to the switch control signal, and divided display of each video signal from the switch unit in correspondence with the monitor areas divided by the diagonal lines of the display screen of the monitor. An image display device for an object, characterized by comprising: