JP2000088524A - Confirming apparatus for fitted component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fitted component confirming apparatus which judges precisely and at a high speed whether components have been fitted to determined positions of a printed board. SOLUTION: A light source 4 is provided, and above this light source 4, a light transmitting mask 3 is provided. And on this light transmitting mask 3, a printed board 2 being a substance to be inspected is cut. And above this printed board 2, a CCD camera 8 is provided. Since the output, of this CCD camera 8, a luminance value obtained from the printed board 2 in an image processor 9, is compared directly with a good/bad judging reference luminance value determined beforehand to perform judgment, it becomes possible to inspect whether or not component fitting of the printed board 2 being a substance to be inspected is good, at a high speed and precisely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounted component checking device for determining whether a component mounted on a printed circuit board is mounted at a predetermined position.

[0002]

2. Description of the Related Art A description will now be given of a conventional method for judging the quality of components mounted on a printed circuit board.

[0003] In the prior art, whether a component mounted on a printed circuit board is good or not has been visually inspected by a human to determine whether or not the component mounted on the printed circuit board is mounted at a predetermined position.

[0004]

However, according to such a conventional method, there is a problem that it takes a very long time and a visual error by a human is inevitably generated.

As a countermeasure, for example, there is a method of directly inspecting a mounted component using a laser beam or a color CCD camera. However, according to these methods, a laser device or a color CCD camera itself is expensive. In addition, the image processing becomes complicated, and the inspection apparatus is expensive.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to inspect a component mounted on a printed circuit board at high speed and accurately.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, a mounting component checking apparatus according to the present invention includes a light source, a light transmitting mask provided above the light source, and a light transmitting mask mounted on the light transmitting mask. A printed circuit board on which components are mounted as an object to be inspected, a CCD camera provided above the printed circuit board, and an output signal of the CCD camera connected to one input of a comparison means of the image processing apparatus, and A comparison means connected to the output of the pass / fail judgment reference value memory at an input of the comparison means; and a judgment means connected to the output of the comparison means and judging pass / fail of the printed circuit board based on a comparison result of the comparison means. The light transmitting mask has a hole corresponding to the component mounting position of the reference printed circuit board, and the memory has a reference component-free printed circuit board and a reference component mounting function. The printed circuit board in which value determined based on the luminance value obtained when each placed on said light transmissive mask is stored. Thereby, the quality of the components mounted on the printed circuit board can be inspected at high speed and accurately.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a light source, a light transmitting mask provided above the light source, and an object to be inspected mounted on the light transmitting mask. A printed circuit board on which components are mounted, a CCD camera provided above the printed circuit board, and an output signal of the CCD camera is connected to one input of a comparison means of the image processing apparatus, and a pass / fail judgment is made to the other input. A comparing means connected to an output of the reference value memory, and a judging means connected to the output of the comparing means and judging pass / fail of the printed circuit board based on a comparison result of the comparing means; The mask is provided with holes corresponding to the component mounting positions of the reference printed circuit board, and in the pass / fail judgment reference value memory, a printed circuit board on which no reference component is mounted and a printed circuit board on which the reference component is mounted are mounted. Each of the mounted component checking devices stores a value determined based on the luminance obtained when the device is mounted on the light transmitting mask, whereby the component-mounted printed board as an object to be inspected is a reference component. Since the brightness value obtained from the unmounted printed board and the reference component-mounted board are directly compared by the comparing means, it is possible to quickly and accurately inspect the quality of the component mounting of the printed board as the inspection object.

Further, in this apparatus, the quality of the components mounted on the printed circuit board is determined based on the luminance value, so that the apparatus can be simplified and the apparatus can be made inexpensive.

Further, since the light from the light transmission mask is captured by a CCD camera and is directly used as position data for inspection, it is not necessary to correct the coordinates.

Furthermore, since the inspection is determined only by the luminance, a large-area inspection range can be fetched at a time, and high-speed inspection can be performed.

A light source according to a second aspect of the present invention is the mounting component checking device according to the first aspect, wherein the light source is a surface light source. Since the light source is a surface light source, a parallel light source can be easily obtained. The description in between can be reduced. Therefore, the size of the mounted component checking device can be reduced.

Further, since the light source can be brought closer to the light transmission mask, a strong luminance can be obtained.

A light source according to a third aspect of the present invention is the mounting component confirmation device according to the second aspect, wherein a twin-to-parallel fluorescent lamp is used. Can be reduced in price.

According to a fourth aspect of the present invention, the hole provided in the light transmitting mask according to the invention is smaller than the mounting part, and is a mounting part confirming apparatus according to the first aspect. The leakage of light from the side surface of the lens is reduced, and erroneous recognition is eliminated.

According to a fifth aspect of the present invention, there is provided a light-transmitting mask.
The mounting component checking device according to claim 1, wherein the light transmission mask is formed of stainless steel, so that the light except for the holes is surely shielded and does not rust.

According to a sixth aspect of the present invention, the thickness of the stainless steel according to the present invention is approximately 0.2 mm.
An appropriate strength can be obtained and the straightness of light is not hindered by the thickness of stainless steel.

According to a seventh aspect of the present invention, the holes of the light transmitting mask according to the seventh aspect of the present invention are the mounting component confirmation device according to the sixth aspect of the present invention, wherein the holes are formed by etching. The cost of manufacturing the transmission mask does not change. Also, the accuracy of the holes is good.

The hole of the light transmitting mask according to the invention of claim 8 is the mounting component confirmation device according to claim 6, which is formed by laser processing. Light transmission mask manufacturing cost is reduced.

According to a ninth aspect of the present invention, there is provided the mounting component confirming apparatus according to the first aspect, wherein a plurality of positioning holes communicating with the printed circuit board are provided at an end of the light transmitting mask. The mask and the printed circuit board can be easily and accurately matched.

According to a tenth aspect of the present invention, there is provided the apparatus for checking a mounted component according to the ninth aspect, further comprising a board press for pressing the vicinity of the side surface of the printed board toward the light transmitting mask. Adhering to the light transmission mask,
Since the printed circuit board does not float, the accuracy of luminance detection is increased.

According to an eleventh aspect of the present invention, the printed circuit board is pressed in the horizontal direction after the printed circuit board is placed on the light transmitting mask through the positioning pins communicating with the positioning holes. Since the printed circuit board is pressed in the horizontal direction and accurately positioned at a predetermined position, the accuracy of luminance detection is increased.

According to the twelfth aspect of the present invention, a pass / fail judgment reference value is calculated based on a luminance value obtained from a component-uninstalled printed circuit board serving as a reference for each mounted component and a reference component-mounted printed circuit board. The mounted component confirmation device according to claim 1, wherein the obtained difference between the brightness values is multiplied by a predetermined constant, and the obtained value is obtained by adding a brightness value obtained from the reference component-mounted printed circuit board as the reference. In addition, since data obtained from a printed circuit board serving as an actual reference is used, the data can be set accurately and easily.

According to a thirteenth aspect of the present invention, there is provided the apparatus for checking a mounted component according to the twelfth aspect, wherein the predetermined constant is approximately 0.5. Since the brightness value is set, the quality of component mounting can be inspected most efficiently and accurately.

According to a fourteenth aspect of the present invention, a hole is formed in the light transmitting mask corresponding to the pattern non-formed portion of the printed circuit board, and the light transmittance of the printed circuit board is determined by the luminance value of light passing through the hole. 14. The mounting component checking device according to claim 13, wherein the corrected luminance value is extracted. Since the holes are formed in the pattern non-formed portions of the printed circuit board, the transmittance of the printed circuit board itself without the influence of the pattern is accurately extracted. it can.

According to a fifteenth aspect of the present invention, the luminance value for each mounted component of the printed circuit board on which the component is mounted as the object to be inspected is the reference luminance value of the printed circuit board of the object to be inspected. The mounted component confirmation device according to claim 14, wherein a ratio of the mounted printed circuit board to a mounted printed circuit board is multiplied by a luminance value for each mounted component of the printed circuit board of the inspection object. Since the variation in the brightness value is corrected, the inspection of component mounting can be performed accurately.

According to the present invention, the luminance value of each mounted component of the component-mounted printed circuit board to be inspected is determined by comparing it with a pass / fail judgment reference value. In the attached component checking device described above, since the pass / fail judgment reference value uses data obtained from a printed circuit board that is an actual reference, it can be set accurately and easily.

According to a seventeenth aspect of the present invention, there is provided the mounted component confirming device according to the first aspect of the present invention, which displays the position of missing parts and the number of missing parts on the printed circuit board to be inspected. Check and repair any missing parts.

According to the present invention, the position of missing parts and the number of missing parts are recorded on a floppy disk.
7. The printed circuit board having a missing part is described in a separate step, and the missing part can be displayed and the missing part can be repaired, so that the mounting part inspection step can be smoothly performed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 4 denotes a light source, which obtains a parallel light source using a twin-to-parallel fluorescent lamp.
The light transmission mask 3 is provided above the light source 4.
A printed circuit board 2 having a single-sided pattern as an object to be inspected is placed in close contact with the light transmitting mask 3. The light transmitting mask 3 and the printed circuit board 2 are positioned by positioning pins 7 communicating with positioning holes.

Reference numeral 6 denotes a printed circuit board laterally pushing the printed circuit board 2 in the direction A. Reference numeral 5 is for pressing the printed board 2 in the direction B, forcing the printed board 2 to warp and bringing the printed board 2 into close contact with the light transmitting mask 3. The light transmitting mask 3 has a hole 3a. Reference numeral 1 denotes a component mounted on the printed circuit board 2.

Then, CC above the printed circuit board 2
A D camera 8 is provided, and the output of the CCD camera 8 is input to one terminal of the comparison means 9a of the image processing device 9. The other input of the comparing means 9a is inputted from a pass / fail judgment reference value memory 9b, and the output of the comparing means 9a is outputted to the judging means 9c. The output of the judging means 9c is displayed on the monitor 10 and output to the personal computer 11 to be recorded on the floppy disk 12 of the personal computer 11.

FIG. 2 is a plan view of the light transmitting mask 3. The light transmitting mask 3 is provided with different holes 3a, 3b, 3c according to the position and size of each mounting component. Then, the brightness information of the light transmitted through each hole is taken in by the CCD camera 8 on the light transmission mask 3 and the coordinate position of each hole and the size of the hole are used as the inspection window to determine the pass / fail judgment reference value memory 9b.
Is stored in

FIG. 3 is a view showing the relationship between the printed circuit board 2 placed on the light transmitting mask 3, the component 1 further mounted on the surface of the printed circuit board 2, and the pattern 2a.
The pattern 2a is not provided on the printed circuit board 2 corresponding to the hole 3a provided in the light transmission mask 3, and the hole 3a is smaller than the component 1. This is hole 3a
If is equal to or larger than the size of the component 1, light leaks from the side of the component 1 and an erroneous determination is made. The light transmission reference hole 3d is a hole provided in a place where the component 1 is not provided, and the pattern 2a must not be provided on the surface of the printed circuit board 2 corresponding to the hole 3d. Thus, the light transmittance of the printed circuit board 2 can be accurately obtained without being affected by the pattern.

FIG. 4 shows the light transmission luminance levels at the same and arbitrary positions at the component mounting positions of the component-mounted printed board and the component-unmounted printed board, as shown in FIG. A component-unmounted printed circuit board has a higher light transmission luminance level. This is because transmission of light is blocked when a component is mounted, and light is easily transmitted when the component is not mounted.

Next, the inspection determination method will be described based on (Equation 1), (Equation 2), and (Equation 3).

[0037]

(Equation 1)

(Equation 1) represents a printed circuit board to be inspected and a component-mounted printed circuit board to be a non-defective sample in order to compensate for the light transmission variation of each of the inspected printed circuit boards with respect to the light transmission of the printed circuit board having the component mounted thereon. Is a formula for correcting each inspection window luminance value from the light transmittance with respect to the light transmission reference.
C ÷ E is for calculating the transmittance of each printed circuit board, and is multiplied by each inspection window luminance value D of the inspected printed circuit board.

[0039]

(Equation 2)

(Equation 2) is a pass / fail judgment reference luminance value for judging pass / fail of each inspection window of the printed circuit board to be inspected. The printed board has no component mounted thereon as a defective sample and the component-mounted print as a non-defective sample. The luminance value difference (A-B) of each inspection window of the board is added to the luminance value (B) of each inspection window of the printed circuit board on which a component is mounted as a non-defective sample, and multiplied by an arbitrary pass / fail setting value constant. .

[0041]

(Equation 3)

(Equation 3) is a pass / fail judgment formula for each inspection window of the inspected printed circuit board. The transmittance corrected luminance value of each inspection window of the inspected printed circuit board of (Equation 1) is expressed by (Equation 2). If the luminance value is lower than the pass / fail judgment reference luminance value, it is determined to be a good product, and if the luminance value is higher, it is determined to be a defective product.

Thus, the quality of component mounting can be inspected most efficiently and accurately without being affected by variations in light transmittance of the printed circuit board.

[0044]

As described above, according to the present invention, a light source, a light-transmitting mask provided above the light source, and a component-mounted print as an inspection object mounted on the light-transmitting mask Board and CC provided above this printed board
A D-camera, a comparison means having an output signal of the CCD camera connected to one input of a comparison means of the image processing apparatus, and an output of a pass / fail judgment reference value memory connected to the other input; Connected to the output of
Determining means for determining the quality of the printed circuit board based on the result of comparison by the comparing means, wherein the light transmitting mask is provided with a hole corresponding to a component mounting position of the reference printed circuit board, and the quality determination reference value memory A mounted component confirmation device in which a value determined based on the luminance obtained when each of the reference component mounted printed circuit board and the reference component mounted printed circuit board is mounted on the light transmission mask is stored. Thus, the printed circuit board on which the component is mounted as the object to be inspected directly compares the luminance value obtained from the printed circuit board on which the reference component is not mounted with the reference component-mounted board by the comparison means. The quality of component mounting on the printed circuit board can be inspected at high speed and accurately.

Further, in this apparatus, the quality of the component mounting on the printed circuit board is determined based on the luminance value, so that the apparatus can be simplified and the apparatus can be made inexpensive.

Further, since the light transmitting mask is captured by the CCD camera and is used as the inspection position, it is not necessary to correct the coordinates.

Further, since the inspection is determined only by the luminance value, a large-area inspection range can be taken at a time, so that high-speed inspection can be performed.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a mounted component confirmation device according to an embodiment of the present invention.

FIG. 2 is a plan view of the light transmitting mask.

FIG. 3 is a cross-sectional view of the printed circuit board mounting portion.

FIG. 4 is an inspection window luminance value graph;

[Explanation of symbols]

 2 Printed circuit board 3 Light transmission mask 3a hole 3d light transmission reference hole 4 light source 8 CCD camera 9 image processing device 9a comparison means 9b pass / fail judgment reference value memory 9c judgment means

Claims (18)

[Claims] 1. A light source, a light-transmitting mask provided above the light source, a component-installed printed board mounted on the light-transmitting mask as an object to be inspected, and provided above the printed board A CCD camera, and an output signal of the CCD camera connected to one input of a comparison means of the image processing apparatus, and the other input connected to an output of a pass / fail judgment reference value memory. Determining means for judging the quality of the printed circuit board based on the comparison result of the comparing means, wherein the light transmitting mask has a hole corresponding to a component mounting position of the reference printed circuit board. And the pass / fail judgment reference value memory, the reference component-unmounted printed circuit board and the reference component-mounted printed circuit board are respectively mounted on the light transmitting mask. A mounting component confirmation device in which a value determined based on the obtained luminance is stored. 2. The apparatus according to claim 1, wherein the light source is a surface light source. 3. The apparatus according to claim 2, wherein the light source uses a twin-to-parallel fluorescent lamp. 4. The apparatus according to claim 1, wherein the holes provided in the light transmitting mask are smaller than the mounting parts. 5. The apparatus according to claim 1, wherein the light transmission mask is made of stainless steel. 6. The mounting component checking device according to claim 5, wherein the thickness of the stainless steel is approximately 0.2 mm. 7. The apparatus according to claim 6, wherein the holes of the light transmission mask are formed by etching. 8. The apparatus according to claim 6, wherein the holes of the light transmitting mask are formed by laser processing. 9. The apparatus according to claim 1, further comprising a plurality of positioning holes communicating with the printed circuit board at an end of the light transmitting mask. 10. The mounting component checking device according to claim 9, further comprising a board press for pressing the vicinity of the side surface of the printed board toward the light transmitting mask. 11. After placing a printed circuit board on a light transmitting mask via a positioning pin connected to a positioning hole,
The device according to claim 9, wherein the device presses the printed circuit board in a horizontal direction. 12. A pass / fail judgment reference value is a difference between a luminance value obtained from a reference component-uninstalled printed circuit board and a luminance value obtained from a reference component-mounted printed circuit board for each mounted component. 2. The mounted component confirmation device according to claim 1, wherein the mounted component confirmation device is a value obtained by multiplying the reference value by a predetermined constant and adding a luminance value obtained from the reference component-mounted printed circuit board to the reference. 13. The apparatus according to claim 12, wherein the predetermined constant is approximately 0.5. 14. A method according to claim 1, wherein a hole is formed in the light transmitting mask corresponding to the pattern non-formed portion of the printed board, and a corrected brightness value, which is a light transmittance of the printed board, is extracted from a brightness value of the light passing through the hole. Item 14. The mounting component confirmation device according to Item 13. 15. A luminance value for each mounted component of a printed circuit board with components mounted thereon as an object to be inspected is a ratio of a corrected luminance value of the printed circuit board of the object to be inspected to a reference printed circuit board with components mounted thereon. 15. The multiplied by a luminance value for each mounted component of the printed circuit board of the inspection object.
A mounting component confirmation device according to item 1. 16. The mounted component checking device according to claim 15, wherein the luminance value of each mounted component of the component-mounted printed circuit board to be inspected is compared with a pass / fail determination reference value to determine pass / fail. 17. The apparatus according to claim 1, wherein a part missing position and the number of missing parts of the printed circuit board to be inspected are displayed. 18. The device according to claim 17, wherein the position of the missing parts and the number of the missing parts are recorded on a floppy disk.