JPH01297888A - Screen printer - Google Patents

Abstract

PURPOSE:To enable accurate registering of a plate and a printing object without requiring proof printing by detecting a position of a first and second positioning marks which are provided to a printed board and a screen plate, respectively by a recognition camera. CONSTITUTION:A recognition camera 33 is moved onto a second positioning mark 32 provided to a screen plate 11 to detect the position. Then the recognition camera 33 is moved onto a first positioning mark 31 which is provided to a printed board 9 which is fixed on a stage 10 to detect the position. Position detection of marks 31, 32 is obtained by detecting a moving amount of an x-axis 36 and a y-axis 37 of a driving section 34 which moves the camera 33 from an origin. Since a stop position A and a horizontal moving position B of the stage 10 are stored in advance, driving command of misregistration amount of marks 31, 32 is issued to a pulse motor which is provided to position control section 18 and a screen print 11 is moved and positioned to register the marks 31, 32.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application 2 The present invention relates to a screen printing machine that prints and applies cream solder or the like to a printed circuit board on which a circuit pattern is formed.

Conventional technology In recent years, screen printing machines have been required to perform high-precision printing, such as printing conductors for forming electronic circuits and printing cream solder, and various methods have been developed to align the screen and substrate. ing.

An example of the conventional screen printing machine described above will be described below with reference to the drawings.

For example, in the apparatus disclosed in Japanese Patent Application Laid-Open No. 61-123543, as shown in FIG. The printing material 1 is moved relatively horizontally and upwardly to position it in a printable position and a test printing is performed, and then the printing material fixing table 2 is moved in the opposite direction to the above, and the printing material 1 is placed in a position where the printing material 1 can be placed on the video camera 6.6.
38-7, then project the print image of the printing material 1 on the monitor TV 7.8, align the reference point of the monitor TV 7.8 with the reference point of the projected printing material 1, and then Replace the master printed material printed on the test printing material 1 with the printed material fixing base 2, and fix the printed material fixing base 2 so that the reference point of the image matches the reference point of the monitor TV 7.8. By moving the screen printing machine, the plates of the screen printing machine can be precisely aligned, allowing for high-precision printing.

Problems to be Solved by the Invention However, in the above configuration, after making a test print on the printing material, the deviation from the reference point of the master printed material is measured and the position is adjusted by the amount of deviation. Each time a plate is replaced, it is necessary to repeatedly perform test printing and alignment, and as the machine is used for high-mix production, which is in high demand these days, plate replacement becomes more frequent, requiring a large amount of time for plate replacement. However, there was a problem in that the operating rate of the device decreased.

In view of the above-mentioned problems, the present invention provides a screen printing machine that does not require test printing, accurately aligns the plate and printing material, and reduces the time required for plate replacement.

Means for Solving the Problems In order to solve the above-mentioned problems, the screen printing machine of the present invention has a first screen printing machine provided on the surface of the printing substrate, for example, a printed circuit board.
a positioning mark provided on the screen plate, a second positioning mark provided on the screen plate, a recognition camera for detecting the positions of the first and second positioning marks, and a screen plate with the printed circuit board fixed to the upper surface. a stage that is horizontally moved and raised relative to the image plane and conveyed to a printable position; a position control unit that controls the position of the screen plate; and a position control unit that moves the recognition camera to the position of the first and second positioning marks. The device is equipped with a drive unit that moves up to

According to the above-described configuration, the present invention uses a recognition camera to detect the positions of the first and second positioning marks provided on the printed circuit board and the screen plate, respectively.
The position control unit that controls the position of the screen plate aligns the positional deviation of the recognition mark, and the position of the screen plate and the printed circuit board is adjusted to a high precision of 5.\-7 degrees without making a test print. It is possible to match them.

EXAMPLE Hereinafter, a screen printing machine according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a front view of the main parts of a screen printing machine according to an embodiment of the present invention, and FIG. 2 is a plan view of the main parts.

Reference numeral 9 denotes a printed circuit board as a printing medium, and 10 denotes a stage on which the printed circuit board 9 can be fixed, and which can move horizontally and move up and down relative to the screen plate 11. 12 is a member that supports and guides the horizontal movement of the stage 10 with a rail;
Stage 10 with a motor, air cylinder (not shown), etc.
performs horizontal and vertical movements. 13 is screen version 11
The plate attached to the plate has a round hole 14 at the right end and an elongated hole 16 at the left end. Numerals 16 and 17 are round pins whose one end is inserted into the round hole 14 and the elongated hole 15, respectively, and the other end is inserted into the position control section 18.

The position control section 18 includes a left Y-axis control section 19 and a right Y-axis control section 2o.
and the X-axis control section 21. Left Y-axis control section 19
and the right Y-axis control unit 20, the feed screws 24.25 are fitted into the blocks 22.23 into which the round 6 heno pins 16.17 are inserted, respectively, and the feed screws 24.2
6 is rotated by pulse motors 26 and 27, the screen plate 1 is rotated through the round pins 16 and 17 and the plate 13.
1 are moved and positioned in the directions of arrows YI and YR in FIG. 2, respectively. Similarly, the X-axis control unit 21 has a feed screw 29 fitted to the block 28, and by rotating the feed screw 29 with a pulse motor 3o, the jib block 28 is moved and positioned in the direction of the arrow X in FIG. do. Block 2
A right Y-axis control unit 2o is fixed on the top of the round pin 16.
, the screen plate 11 through the plate 13 in the direction of the arrow X
Move and position in the direction. A plurality of first positioning marks 31 are provided on the surface of the printed circuit board 9 at predetermined locations. A plurality of second positioning marks 32 are also provided at predetermined locations on the screen plate 11. The second positioning mark 32 is placed on the screen plate 11 as shown in FIG.
Alternatively, as shown in FIG. 4, half-etched holes 32-b may be formed using stainless steel or the like as the material of the screen plate 11.

Further, the positions of the first positioning mark 31 and the second positioning mark 32 do not have to be in the same positional relationship. 33 is a recognition camera, and as shown in FIGS. 1 and 2, this recognition camera 33 is indicated by an arrow X.

It is mounted on a drive unit 34 that is movable in the y and z directions. The drive unit 34 has two axes 35 that move the recognition camera 33 up and down, an X-axis 36 that moves in the same direction as the stage 10, and an X-axis 3.
6 and a y-axis 37 moving in a direction perpendicular to 6. Each axis is driven by a ball screw, a servo motor, etc. (not shown). 38 is a portion of the print head.

The operation of the screen printing machine configured as described above will be explained below with reference to FIGS. 1 and 2.

First, the recognition camera 33 is moved over the second positioning mark 32 provided on the screen plate 11 to detect the position, and then the recognition camera 33 is installed on the printed circuit board 9 fixed on the stage 10. first positioning mark 3
1 and detect its position. The positions of the first and second positioning marks 31 and 32 are determined by detecting the amount of movement of the drive unit 34 that moves the recognition camera 33 from the origin of the X-axis 36 and y-axis 37. In FIG. 1, the stop position A of the stage 10 and the horizontal movement position B
is stored in advance as position data, so stage 1
Since it is possible to know where the printed circuit board 9, that is, the first positioning mark 31 will be located when 0 moves horizontally and reaches position B, the position control unit 18 is provided with a difference between the first and second position detection marks. A drive command is issued to the pulse smokes 26, 27, and 30 to move and position the screen plate 11, thereby moving the first and second positioning marks 31 and 32.
In other words, the screen plate 11 and the printed circuit board 9 can be aligned. Next, the stage 10 is raised to the C position, that is, the printable position below the screen plate 11, and the printed circuit board 9 is raised to perform screen printing.

As described above, according to this embodiment, the first
a second positioning mark 32 on the screen 11, and a first and second positioning mark 32 on the screen 11;
a recognition camera 33 that detects the position of the positioning marks 31 and 32; and a stage that fixes the printed circuit board 9 on its upper surface and moves it horizontally and upwardly relative to the screen plate 11 to transport it to a printable position. 1o, the position control unit 18 that controls the position of the screen plate 11, and the recognition camera 33 at the first and second positioning mark positions 31 and 32.
By providing a drive unit 34 that moves the screen plate 11 to a position where the position can be detected, the screen plate 11 can be moved to a position where the screen plate 11 can be detected.
The printed circuit board 9 can be aligned with high accuracy.

Note that in order to align the first and second alignment marks 31 and 32, in this embodiment the screen plate 11 was moved and positioned by the position control unit 18, but the position control unit was provided on the stage 1o and the printed circuit board was used. The 9th side may be moved and positioned.

Effects of the Invention As described above, the present invention provides a first positioning mark 1Q-7 provided at a predetermined location on a printed circuit board, which is a printed circuit board, and a second positioning mark provided at a predetermined location on a screen plate. a recognition camera for detecting the positions of the marks, the first and second positioning marks, a stage on which a printed circuit board is fixed on an upper surface and is conveyed horizontally and elevated relative to the screen plate, and a screen. By providing a position control unit that controls the position of the plate and a drive unit that moves the recognition camera to the positioning mark position, it is possible to align the screen plate and printed circuit board with high precision without making a test print. This makes it possible to shorten the plate replacement work time and improve the device operating rate.

[Brief explanation of the drawing]

Fig. 1 is a front view of the main parts of a screen printing machine according to an embodiment of the present invention, Fig. 2 is a plan view of the main parts of Fig. 1, Fig. 3a,
b is a partial plan view and a sectional view of a second example of the shape provided on the screen plate, and FIG. 5 is a front view of the main parts of a conventional screen printing machine. 9...Printed circuit board, 10...stage, 11...screen version, 18...
Position control unit, 31...first positioning mark, 32...second positioning mark l, 33.
...Recognition camera, 34...Drive unit. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure 4

Claims (1)

[Claims] In a screen printing machine that prints and applies cream solder or the like to a printed circuit board on which a circuit pattern is formed, a plurality of first positioning marks are provided at predetermined locations on the surface of the printed circuit board, and a plurality of first positioning marks are provided at predetermined locations on the screen. a plurality of second positioning marks, a recognition camera that detects the positions of the first and second positioning marks, and the printed circuit board is fixed to the upper surface, and horizontally moved and raised relative to the screen. and a position control unit that controls the position of the screen, and a drive unit that moves the recognition camera to the positions of the first and second positioning marks. A screen printing machine featuring