JPS62211657A - Printing method for printed circuit board - Google Patents

Abstract

PURPOSE:To simultaneously attain the alignment to both faces of a printed circuit board by aligning in advance the upper and lower mask films being in a horizontal attitude, and thereafter, placing the printed circuit board between them, and displacing a supporting body for holding the mask films through an optical device, a displacement device, etc. CONSTITUTION:In an attitude in which a pair of upper and lower mask films 22 are provided adjacently, the respective television cameras 36 in an optical device 35 are placed at prescribed positions, and a reference mark for an alignment provided on a part of each mask film 22 is photographed. This photographing signal in sent to a control value setting device 42, the deviation of each reference mark is calculated, and a supporting body 24 is displaced in the direction where this dislocation becomes zero, by which the alignment is executed. Thereafter, both mask films 22 are separated, and between them, a board supporting frame 15 for holding a printed circuit board 14 is placed, and the alignment of three of the upper and lower mask films 22 and the printed board 14 is executed simultaneously and exactly through an optical device 35, the control value setting device 42, and a displacement device 29, and thereafter, double face printing by an exposure light source 5 is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for printing printed circuit boards, and more specifically, the present invention relates to a method for printing printed circuit boards, and more specifically, printing is performed on both sides of a printed circuit board at the same time, and a mask is applied to both sides. This allows film alignment to be achieved automatically.

"Prior Art" A predetermined pattern is printed on a printed circuit board by placing a mask film close to the printed circuit board.

This is achieved by transmitting parallel light through a mask film and irradiating the printed circuit board.

Conventional printing means in this case is to automatically align and arrange a mask film on one side of a printed circuit board, and after printing one side, turn it over and print the other side.

As is well known, alignment of a mask film on both sides of a printed circuit board requires extremely delicate work and requires a high degree of precision.

However, with the above-mentioned means, if an error due to mechanical deviation occurs during automatic alignment of one side, a similar error will occur when aligning the other side, resulting in twice the error. Put it away.

"Problems to be Solved by the Invention" From this point of view, a pair of mask films are simultaneously aligned on both sides of the printed circuit board.

It is also conceivable to expose and print both sides at the same time.
No means have been developed to automatically achieve this alignment of a pair of mask films.

This alignment requires an extremely large amount of effort.

It is impossible to use the above-mentioned automatic alignment device for one side as it is for both sides, so a means has been developed that can automatically align a pair of mask films on both sides of a printed circuit board at the same time. For example, it is expected to improve the productivity of the exposure process for printed circuit boards, reduce the environmental protection space required at processing sites, and reduce production costs.

The present invention solves the above-mentioned conventional drawbacks and inconveniences, and is a printed circuit board printing method invented in view of the demand, which can automatically and simultaneously align a pair of mask films on both sides of a printed circuit board. The purpose is to do so.

"Means and Effects for Solving Problems" The present invention will be explained below with reference to the drawings showing an embodiment of the present invention.

The present invention is a printed circuit board in which a pair of mask films 22 in a horizontal position are arranged above and below a printed circuit board 14 in a horizontal position, and the pattern of the mask film 22 described above is printed on both sides of the printed circuit board 14 using an exposure light source 5. Baking is a method, and the apparatus here includes a substrate support frame 15.
, a support body 24 , an optical device 35 , and a restriction value setting device 4
2 and a displacement device 29.

A pair of supports 24 arranged opposite each hold the mask film 22 in a horizontal position, and between the pair of supports 24, a board support 15 holding the printed circuit board 14 is held in a horizontal position. can be moved freely.

The support body 24 can hold the mask film 22 and can be displaced in a predetermined direction while maintaining its horizontal position.

The predetermined direction here means that the X direction is one horizontal direction of the mask film 22, the Y direction is a horizontal direction perpendicular to this X direction,
The θ direction is the direction of rotation about the center of the mask film 22, and the mask film 22 is displaced in response to a predetermined signal command.

Next, the optical device 35 includes a plurality of sets of television cameras 36 and a mask film 22 . Or printed circuit board 1
This is to photograph a reference mark for positioning provided on a part of 4.

Optical device! 35 is sent to the restriction value setting device 42.
Here, the deviation between the reference marks described above is calculated according to this image pickup signal.

The amount of displacement in the X direction, Y direction, and θ rotation direction is calculated so that this deviation becomes zero, and the calculated displacement signal is output.

Then, upon receiving the displacement signal from this restriction value setting device 42,
Activate the displacement device 29 attached to the support 24 described above to move the support 24 in the X direction and the Y direction, or
It is rotated in the θ direction.

In the above-described configuration, first, each television camera 36 in the optical device 35 is placed at a predetermined position i with the pair of upper and lower mask films 22 brought close to each other, and a portion of each of the upper and lower mask films 22 is At the same time, the reference marks for positioning provided at the positions are photographed (see FIG. 2C).

The plurality of optical devices 35 photograph each reference mark on each of the upper and lower mask films 22.
Since there is a deviation in the overlapping of each reference mark due to elongation deformation of 2, etc., in order to minimize this deviation, the imaging signal from the optical device 35 is sent to the restriction value setting device 42, and the deviation between the reference marks is , calculate the amount of displacement in the predetermined direction to make this deviation zero, and upon receiving the displacement signal from the restriction value setting device 42, move the support body 24 via the displacement device 29, or It rotates.

After aligning the upper and lower mask films 22 in this manner, the two mask films 22 are separated.

The board support frame 15 holding the printed circuit board 14 is arranged between them so as to maintain parallel and horizontal postures (see FIG. 2), and the optical device 35° control value setting device 42. One mask film 2 is removed via the displacement device 29.
2 to the printed circuit board 14 (see Figure 2C)
.

When aligning one mask film 22 with respect to the printed circuit board 14, the other mask film 22 is simultaneously displaced and aligned in synchronization with the movement of one mask film 22.

In other words, the support 2 holding one mask film 22
5 when displacing in the X direction, Y direction, and θ direction in 4.
At the same time, the support 24 holding the other mask film 22 is also displaced in synchronization.

The upper and lower mask films 22 have been aligned in advance as described above (FIG. 2a), so when aligning one mask film 22 to the printed circuit board 14, the other mask film 22 must be displaced at the same time. By doing so, the alignment of the upper and lower mask films 22 and the printed circuit board 14 can be achieved simultaneously, accurately and easily, and after this alignment is done, the pattern of each mask film 22 is It is sufficient to print on both sides of the printed circuit board 14 using the exposure light source 5 (see Fig. 2C).
.

Embodiment In the illustrated embodiment, an apparatus for printing a printed circuit board 14 according to the present invention is installed in a housing composed of an exposure machine main body 1 and a workbench 2.

The exposure machine main body 1 is divided into a lamp house 3 and an exposure chamber 4, and the work table 2 is protruded continuously from the exposure chamber 4 (see FIG. 3).

A pair of exposure light sources 5, which are short-arc mercury lamps, are arranged inside the lamp house 3, and the light from the exposure light sources 5 is transmitted to each reflecting mirror 6. A mirror 7° is sent into the exposure chamber 4 via a fly-eye lens 8 for optimal collimation of the light, and further inside the exposure chamber 4, a parabolic mirror 9 is used.
The light becomes parallel light, and the upper mask film 22a
Alternatively, the light passes through the lower mask film 22b and is irradiated onto the printed circuit board 14.

A base frame 10 is installed in the exposure chamber 4, and the substrate support frame 15 described above is installed. Upper and lower supports 24. An optical device 35, a displacement device 29, etc. are incorporated.

That is, on the base frame 10, there are four first supports 11. for the printed circuit board 14. Four second pillars 12 for mask film 22. Four third pillars 13 for the optical device 35 are separately erected at predetermined positions at regular intervals (see FIG. 4).

The printed circuit board 14 is coated with a photoresist film on one side or laminated with a dry film, and is held by a substrate support frame 15, which is used as a substrate guide in the exposure chamber 4. It is assembled into the frame 16.

Then, this board guide frame 16 is assembled to the above-described first support 11, and the first air cylinder 17 attached to a part of the board guide frame 16 supports the board support frame 15 together with the printed circuit board 14. It is moved up and down while maintaining its horizontal position (see Figures 1 and 6).

By the way, the above-mentioned workbench 2 is equipped with a standby board guide frame 18, and this part is used to guide the printed board 14.
is assembled to the board support frame 15, and further this board support frame 15 is assembled to the board support frame 15.
is assembled to the standby board guide frame 18.

After that, the board guide frame 16 in the exposure chamber 4 and the standby board guide frame 18 of the workbench 2 are aligned, and the board support frame 15 holding the printed circuit board 14 is moved to the standby board guide frame 1.
8 to the substrate guide frame 16.

This feeding means is 9 in the illustrated embodiment, the substrate support frame 15
Chain fixed to 19. This is achieved through the chain wheel 20 and substrate moving motor 21. Of course.

When the printing is completed, the substrate is transferred from the substrate guide frame 16 to the standby substrate guide frame 18.

Next, the support body 24 is attached to the base frame 25. X direction frame 26. Y direction frame 27. It is constructed by sequentially stacking θ-direction frames 28 from below, and the X-direction frame 26 is movable in the X direction and the Y-direction frame 27 is movable in the Y direction with respect to the one base frame 25.

The θ direction frame 28 is rotatable in the θ rotation direction, and each of the frames 28 is split in the displacement direction by the displacement device 29 described above.

In the illustrated embodiment, each of the displacement devices 29 includes an X-direction frame circumferential motor 3 such as a stepping motor or a servo motor.
0. Y direction frame circumference motor 31. A θ-direction frame circumferential motor 32 is attached and is displaced via a gear device 34 (
(See Figures 4, 5, 6, and 7).

The support body 24 consists of an upper support body 24a and a lower support body 24b, and is assembled to the four second pillars 12 described above.

The base frame 25 of the upper support 24a is fixed to the upper end of the second support 12 while maintaining a horizontal position,
The base frame 25 of the lower support body 24b is assembled to the second support column 12 so as to be movable up and down, and a second air cylinder 33 attached to a part of the base frame 25 allows the lower mask film 2
2b is raised and lowered while maintaining its horizontal position (see Figs. 1 and 6).

Further, the mask film 22 is held by a film (M) holding frame 23, and this film holding frame 23 is assembled to a support body 24.

Next, four sets of optical devices 35 are arranged, each of which is attached to the four third pillars 13 described above via a support arm 38, and a television camera 36. At the tips of the following two support arms 38,
A light emitter 37 is arranged on the optical axis of the television camera 36,
The support arm 38 whose base end is attached to the third support column 13 is
It rotates or moves up and down via a predetermined operation motor 39.

Therefore, the printed circuit board 14 located between the television camera 36 and the light emitter 37. Alternatively, the light emitting body 3 transmits through the alignment reference mark provided on a part of the mask film 22.
7 lights are simultaneously photographed by a television camera 36.

When the television camera 36 and the light emitter 37 are not in use,
When the support arm 38 is rotated to move the support body 24 up and down,
Make sure it does not get in the way during exposure.

The exposure light source 5 is located behind the upper mask film 22a and the lower mask film 22b, and transmits light through the mask film 22 and onto the printed circuit board 1.
The predetermined pattern of the mask film 22 is printed onto the printed circuit board 14 by irradiating the mask film 22 in parallel with the rays.

Upper mask film 22a and lower mask film 2
2b or upper mask film 22a
As a specific means for aligning the printed circuit board work 4 and the center of gravity of each of the four reference marks, the optical device 35. The difference in the center of gravity is calculated by the restriction value setting device 42, and the center of gravity is moved in the X and Y directions so that they match, and then the bisector of two sets of diagonal lines connecting the four reference marks is However, the upper and lower mask films 22 or printed circuit boards 14 are rotated in the θ direction so that they coincide.

This correction value is calculated by an image processing program within the restriction value setting device 42 and sent to the displacement device 29 as a pulse signal.

Note that the first air cylinder 17. which moves the substrate guide plate 16 up and down mentioned above. The second air cylinder 33 that moves the lower support body 24b up and down is operated by a solenoid valve 40, and the operation of this solenoid valve 40 is controlled by the microcomputer 4.
According to the directive of 1.

The microcomputer 41 operates not only on the split tube of the solenoid valve 40 but also on the exposure light source 5. Optical device 35. Restriction value setting device 42.
The circuit board moving motor 21 and the like are divided, and the control value setting device 42 is connected to the optical device 35.

It is also connected to a signal processing device 43, and this signal processing device 43 functions when aligning the upper support body 24a with respect to the printed circuit board 14 and synchronously displacing the lower support body 24b.

The restriction value setting device 42 has a display 44 . It is also connected to a keyboard 45, allowing the optical device 35 to perform image processing.

"Effects of the Invention" As is clear from the above description, according to the printing method of the printed circuit board of the present invention, the pair of mask films are automatically and precisely aligned on both sides of the printed circuit board at the same time. This is expected to improve the productivity of the printed circuit board exposure process.

It is possible to reduce the environmental protection space at the processing site, which reduces production costs and is economical.Since the printed circuit board and mask film do not come into contact with each other, there is no damage to either, and the service life of the mask film is extended. This results in longer product yields and improved product yields.

It has many excellent effects.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram of an apparatus for a method of printing a printed circuit board according to the present invention. FIG. 2 is a sectional view showing the operating procedure and effects. FIG. 3 is a front view showing an embodiment of the present invention. FIG. 4 is a cross-sectional plan view taken along the line IV-■ in FIG. 3. FIG. 5 is a cross-sectional plan view taken along the line V-V in FIG. 3. FIG. 6 is a cross-sectional plan view taken along the line ■-vr in FIG. 3. FIG. 7 is a cross-sectional plan view taken along the line ■-■ in FIG. 3. Explanation of symbols 5; Exposure light source, 14; Printed circuit board, 15; Substrate support frame 822; Mask film, 24; Support body, 29; First place device, 35; Optical device, 36; Television camera, 42; Restriction value setting Device, 43; signal processing device. Applicant Oak Manufacturing Co., Ltd. Bushilog 7 colors 4 defense x 7 chili 7 kirikikit

Claims (1)

[Scope of Claims] A printed circuit board printing method in which a pair of horizontal mask films are placed above and below a horizontal printed circuit board, and a pattern of the mask film is printed on both sides of the printed circuit board using an exposure light source. A substrate support frame that holds the printed circuit board and is horizontally movable, and the mask film are movable in the X direction and in the Y direction orthogonal to the X direction, respectively, while maintaining the horizontal posture. a support that holds the mask film rotatably in the θ rotational direction about the geometric center of the mask film; and a reference mark for alignment provided on a part of the printed circuit board and the mask film. An optical device equipped with a plurality of sets of television cameras for photographing, and calculating the deviation between the reference marks according to the imaging signal from the optical device, and calculating the deviation in the X direction, Y direction, and θ rotation direction to make this deviation zero. A restriction value setting device that calculates a displacement amount and outputs the calculated displacement signal, and a displacement device that displaces the support according to the displacement signal from the restriction value setting device, and the upper and lower mask films are In the close posture, one mask film is moved and rotated in the X direction, Y direction, and θ rotation direction through the displacement device by optical processing of the restriction value setting device, and the other mask film is moved and rotated in the X direction, Y direction, and θ rotation direction. After alignment with the film, the two mask films are separated, the substrate support frame is placed between the two mask films, and the one mask film is placed on the printed circuit board of the substrate support frame, and the control value is set. and positioning by moving and rotating in the X direction, Y direction, and θ rotational direction through the device and the displacement device, and simultaneously moving the other mask film in synchronization with one mask film to align the mask film. Then, the patterns of both mask films are printed on both sides of the printed circuit board.