JP2002029033A - Method for creating data for inspection of print inspecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for creating data for an inspection of a print inspecting device capable of improving an inspecting accuracy by a simple method. SOLUTION: In creating the data for the inspection used for the print inspecting device for inspecting a printing state of a cream solder of a base after screen printing, an aperture shape of pattern pores of a mask plate 12 used for the screen printing is measured by a laser measuring instrument 20, data of the aperture shape is obtained, and this measured result is compared with mask forming data of the plate 12, and error data indicating an error from a normal shape of the plate 12 is obtained. The data for the inspection is created based on the mask creating data and the error data. Thus, the data for the inspection of a high accuracy in which influences of a mask manufacturing error and an aging deformation are removed can be created by the simple method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing inspection data of a print inspection apparatus used in a print inspection apparatus for inspecting a printing state of cream solder printed on a substrate.

[0002]

2. Description of the Related Art In mounting electronic components, cream solder is applied to the surface of the substrate prior to mounting the electronic component on the substrate. As a method of applying cream solder, a screen printing method is widely used, and after the printing process, a printing inspection for inspecting a printing state of the cream solder is performed. In this print inspection, the board after screen printing is imaged by a camera, and the imaged result is subjected to image processing to determine whether or not cream solder is correctly printed on a printed portion. Then, prior to the print inspection, inspection data indicating a print portion of the inspection target substrate on which the cream solder is to be printed is input to the print inspection device.

Conventionally, this inspection data has been created by various methods, for example, a method using mask creation data indicating the shape of the pattern hole of a mask plate used for printing, and a good printed state from among printed substrates. A method was adopted in which a substrate that was considered to be selected was used as a master substrate, and this master substrate was recognized by an inspection apparatus.

[0004]

However, each of the above-mentioned conventional methods has a problem, and is not always an appropriate method. For example, mask creation data is not always available to all users, and the actual mask plate is not always made exactly as the mask creation data due to manufacturing errors and deformations. In some cases. In addition, when a master substrate is used, the above methods have various problems, such as difficulty in determining the quality of the master substrate itself and lack of reliability of the inspection data itself, and a simple method and excellent reliability are required. There has been a demand for a method of creating inspection data that satisfies inspection accuracy.

Accordingly, an object of the present invention is to provide a method for creating inspection data of a print inspection apparatus which can improve inspection accuracy by a simple method.

[0006]

According to a first aspect of the present invention, there is provided a method of preparing inspection data for a print inspection apparatus, wherein the inspection data is used in a print inspection apparatus for inspecting a printed state of cream solder on a substrate after screen printing. In the method, an opening shape of a pattern hole of a mask plate used for screen printing is measured by a shape measuring unit, and inspection data is created from the data of the opening shape obtained by the measurement.

According to a second aspect of the present invention, there is provided a method of generating inspection data for use in a print inspection apparatus for inspecting a printed state of cream solder on a board after screen printing. The shape of the opening of the pattern hole of the mask plate used for screen printing is measured by a shape measuring means, and the data of the opening shape obtained by this measurement is compared with the mask making data of the mask plate to thereby determine the regularity of the mask plate. Error data indicating an error from the shape is obtained, and inspection data is created based on the mask creation data and the error data.

According to the present invention, an opening shape of a pattern hole of a mask plate used for screen printing is measured by a shape measuring means, and inspection data is created from the data of the opening shape obtained by the measurement. More preferably, by comparing this measurement result with the mask making data of the mask plate to obtain error data indicating an error from the normal shape of the mask plate, highly accurate inspection data can be obtained by a simple method. Can be created.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a front view of a screen printing apparatus according to one embodiment of the present invention, FIG. 2 is a side view of the screen printing apparatus according to one embodiment of the present invention, and FIG. 3 is a screen printing apparatus according to one embodiment of the present invention. FIG. 4 is a perspective view of a laser measuring device of the screen printing apparatus according to the embodiment of the present invention, and FIG. 5 is a block diagram showing a configuration of a control system of the screen printing apparatus of the embodiment of the present invention. is there.

First, the structure of the screen printing apparatus will be described with reference to FIGS. 1, 2 and 3. 1 and 2, a substrate positioning unit 1 serving as a substrate positioning unit stacks a θ-axis table 4 on a moving table including an X-axis table 2 and a Y-axis table 3, and further has a Z-axis table 5 thereon. A substrate holding unit 7 is provided on the Z-axis table 5 for holding the substrate 6 sandwiched by the clampers 8 from below. The substrate 6 to be printed is carried into the substrate positioning unit 1 by the carry-in conveyor 14 shown in FIGS. By driving the substrate positioning unit 1, the position of the substrate 6 can be adjusted. The printed substrate 6 is carried out by the carry-out conveyor 15.

A screen mask 10 is provided above the substrate positioning section 1. The screen mask 10 is configured by mounting a mask plate 12 on a holder 11. The substrate 6 is positioned with respect to the mask plate 12 by the substrate positioning unit 1 and abuts from below. A squeegee head 13 is disposed on the screen mask 10 so as to be able to reciprocate in a horizontal direction. With the substrate 6 in contact with the lower surface of the mask plate 12, the mask plate 12
An electrode 6a formed on the surface of the substrate 6 (see FIG. 3) is supplied by supplying cream solder 9, which is a paste, onto the surface of the substrate 6 by sliding the squeegee 13a of the squeegee head 13 into contact with the surface of the mask plate 12. On the upper side, cream solder 9 is printed via pattern holes 12a (see FIG. 3) provided in the mask plate 12.

Above the screen mask 10, a laser measuring device 20 as a shape measuring means is provided. As shown in FIG. 3, the laser measurement device 20
1 and the Y-axis table 22 horizontally move in the X and Y directions, and can be raised and lowered by lifting means 23 (FIGS. 1 and 2). By driving the lifting / lowering means 23, the laser measurement device 20 is lowered to the measurement height position. The X-axis table 21, the Y-axis table 22, and the lifting / lowering means 23
It serves as a moving means for moving the laser measuring device 20.

The laser measuring device 20 has a function of measuring a vertical displacement by irradiating a laser beam and a scanning mechanism for scanning a laser irradiation position in the XY directions.
As shown in FIG. 4, by scanning the irradiation point P within the measurement range R, the vertical position of the surface of the measurement object within the measurement range R is continuously detected, and the three-dimensional shape of the measurement object can be measured. It has become.

By moving the laser measuring device 20 with respect to the substrate 6 and the mask plate 12 by the moving means, a three-dimensional shape measurement can be performed on an arbitrary range of the substrate 6 and the mask plate 12. By processing the obtained measurement data, it is possible to detect the arrangement pattern of the electrodes 6a, which are the characteristic parts of the substrate 6, and the arrangement pattern of the pattern holes 12a, which are the characteristic parts of the mask plate 12. By performing three-dimensional measurement using the substrate 6 as a measurement target, the shape of the cream solder 9 printed on the substrate 6 can be three-dimensionally detected. Therefore, the screen printing apparatus has the function of the print inspection apparatus.

Next, a configuration of a control system of the screen printing apparatus will be described with reference to FIG. In FIG.
U30 is an overall control unit that performs overall control of each unit described below. The program storage unit 31 stores a screen printing operation program, a processing program for measuring the shape of the substrate 6 and the mask plate 12 from a detection signal of the laser measurement device 20, and programs for various determination processes described below. The data storage unit 32 stores various data such as data of screen printing conditions and inspection data of print inspection performed on a printed board.

The mechanism control unit 33 includes a board positioning unit 1, a carry-in conveyor 14, a carry-out conveyor 15, and an X-axis table 2.
1. The operation of each mechanism such as the Y-axis table 22 is controlled. The shape detection unit 34 processes the detection signal obtained by scanning the laser measurement device 20, thereby providing the electrode arrangement data indicating the planar arrangement of the electrodes 6 a provided on the substrate 6 and the electrode arrangement data provided on the mask plate 12. Pattern hole 12a
Opening data indicating the shape and arrangement of the substrate 6 after printing
The shape data of the upper cream solder 9 is detected.

The inspection data creation unit 35 includes the shape detection unit 3
Based on the mask opening shape data detected by step 4, the inspection data used for the print inspection for determining the quality of the printing state is created. When creating the inspection data, the measurement result obtained by measuring the actual mask plate 12 is compared with the mask creation data of the mask plate 12 to determine the error of the mask plate 12 from the normal shape. Is obtained. Then, the inspection data used for the actual print inspection is created based on the error data and the mask creation data.

That is, if the actual shape error of the mask plate 12 is within an allowable value, mask creation data stored in advance as original data is used as inspection data. If the detected error exceeds the allowable value, the mask opening shape data actually obtained by measurement is used as inspection data. If mask creation data is not provided, the mask opening data may be used as it is as inspection data.

The print determination unit 36 determines the shape data of the cream solder 9 obtained by measuring the screen printed board 6 with the laser measuring device 20, that is, the position of the printed cream solder 9 on the board 6 and the printing. By comparing the data indicating the volume of the cream solder 9 with the inspection data created by the inspection data creation unit 35 and stored in the data storage unit 32, the quality of the printing state is determined.

This screen printing apparatus is configured as described above, and a screen printing method will be described below. First, the type is switched to a new type to be printed, and when the screen mask 10 is mounted corresponding to the type, the shape of the mask opening pattern is measured.
This measurement is performed by three-dimensionally measuring the upper surface of the mask plate 12 while the laser measuring device 20 is moved on the mask plate 12 by the X-axis table 21 and the Y-axis table 22 with the screen mask 10 mounted. Will be By this measurement, mask opening shape data that is the basis of inspection data used for print inspection is obtained. The obtained mask opening shape data is sent to the inspection data creation unit 35, and inspection data is created. The created inspection data is stored in the data storage unit 32.

Next, a screen printing operation is started.
First, the cream solder 9 is supplied onto the mask plate 12, and the squeegee 13a is reciprocated to perform preliminary squeezing for kneading the cream solder 9, and then the Z-axis table 5 of the board positioning unit 1 is raised to mask the board 6 Plate 1
2 is brought into contact with the lower surface. Next, the squeegee head 13 is moved to print the cream solder 9 on the electrode 6a of the substrate 6 via the pattern hole 12a. Thereafter, by lowering the Z-axis table 5 and separating the plate, cream solder 9 is printed on the electrodes 6a of the substrate 6.

Thereafter, a print inspection is performed. This print inspection is performed by moving the substrate positioning unit 1 again from below the screen mask 10 to the substrate measurement position (see FIG. 2), and three-dimensionally measuring the upper surface of the printed substrate 6 by the laser measurement device 20. . Then, the three-dimensional measurement result is compared with the inspection data stored in the data storage unit 32, and the quality of the print result is determined. If it is determined by this inspection that the printing state is good, the substrate positioning unit 1 returns to the printing position on the lower surface of the mask plate, where the printed substrate 6 is transferred to the carry-out conveyor 15 and the printing operation of the cream solder 9 is performed. Complete.

In this print inspection, inspection data created based on the measurement result of a screen mask used for actual printing is used. Therefore, the inspection result includes misalignment caused by the screen printing operation itself. The variation in the print amount is correctly reflected. That is, in the conventional method using the mask creation data as the inspection data as it is, it is not possible to uniquely determine whether or not the variation indicated by the inspection result is directly caused by the printing process itself. In the inspection data shown in the embodiment, the effects of mask manufacturing errors and temporal deformation are removed, and an inspection result for correctly evaluating the printing process itself is obtained. As a result, even when a failure occurs, it is possible to obtain useful data for determining the cause of the failure.

In the present embodiment, the print inspection is performed by a screen printing apparatus having a print inspection function, but it is used in a dedicated inspection apparatus provided separately and independently of the screen printing apparatus. Inspection data to be inspected. That is, the mask plate used for the substrate to be inspected may be measured by the three-dimensional measurement function of the screen printing device described in the above embodiment or by using a dedicated three-dimensional measurement device.
Then, mask opening shape data is obtained from the measurement result, and inspection data is created.

[0025]

According to the present invention, the opening shape of the pattern hole of the mask plate used for screen printing is measured by the shape measuring means, and inspection data is created from the opening shape data obtained by this measurement. More preferably, by comparing this measurement result with the mask making data of the mask plate to obtain error data indicating an error from the normal shape of the mask plate, a highly accurate inspection can be performed by a simple method. Data can be created, and the effects of mask manufacturing errors and temporal deformation can be eliminated, and inspection results that correctly evaluate the printing process itself can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view of a screen printing apparatus according to an embodiment of the present invention.

FIG. 2 is a side view of the screen printing apparatus according to the embodiment of the present invention.

FIG. 3 is a plan view of a screen printing apparatus according to an embodiment of the present invention.

FIG. 4 is a perspective view of a laser measuring device of the screen printing device according to the embodiment of the present invention;

FIG. 5 is a block diagram illustrating a configuration of a control system of the screen printing apparatus according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate positioning part 6 Substrate 10 Screen mask 12 Mask plate 12a Pattern hole 13 Squeegee head 20 Laser measuring device 34 Shape detection part 35 Inspection data creation part 36 Printing judgment part

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Shigetaka Abe 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 2C250 EB39 EB43 EB50 2F065 AA53 BB02 BB29 CC01 CC26 FF61 GG04 MM03 PP12 QQ21 QQ32 QQ38 5E319 AA03 AC01 BB05 CD04 CD29 CD53 GG20

Claims (2)

[Claims] 1. A method for producing inspection data used in a print inspection apparatus for inspecting the printed state of cream solder on a substrate after screen printing, wherein the shape of an opening of a pattern hole of a mask plate used for screen printing is formed. A method for producing inspection data for a print inspection apparatus, wherein the inspection data is produced from data of the opening shape obtained by measurement by measuring means. 2. A method for producing inspection data used in a print inspection apparatus for inspecting a printed state of cream solder on a substrate after screen printing, wherein the shape of an opening of a pattern hole of a mask plate used for screen printing is formed. Measured by measuring means, error data indicating an error from the normal shape of the mask plate is obtained by comparing the data of the opening shape obtained by this measurement with the mask making data of the mask plate, and obtaining the mask making data And generating inspection data on the basis of the error data.