JP2001310208A - Standard hole drilling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent positional slippage of a printed circuit board placed on a movable table and the movable table at the time of moving the movable table of a standard hole drilling machine. SOLUTION: The printed circuit board (not illustrated) which is a work is placed on the movable table 12 of the standard hole drilling machine 1. The work is sucked and fixed by air of negative pressure applied on pores (not illustrated) opened in a large number on the movable table 12. An axis of rotation is provided at right angles with the moving direction of the movable table on a central part of a printed circuit board presser 71, a presser roller 72 to rotate in accordance with movement of the movable of table 12 is set, and this presser roller 72 is singly free to move vertically. When the work is inserted at a working position, the printed circuit board presser 71 and the presser roller 72 are lowered at a working starting position, the printed circuit board presser 71 pressurizes the work when the movable table stops, pressurizes the work on the movable table 12 until working is finished, and it prevents positional slippage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reference hole punching machine for forming a reference hole in a printed wiring board, and more particularly to a fixing device suitable for pressing and holding a work on a movable table.

[0002]

2. Description of the Related Art In recent years, as electronic components for surface mounting such as IC chips, resistors, and capacitors have become smaller, printed wiring boards on which they are mounted are required to have higher densities, and many of them are multilayered. . A multilayer printed wiring board having four or six conductor layers is used for consumer use, and a high multilayer printed wiring board having a larger number of layers is used for industrial use.
The multilayer printed wiring board is composed of a conductor layer exposed to the outside of the front and back layers and several unexposed inner conductor layers, and an insulating substrate is inserted between the conductor layers. It has a bonded structure.

As a conductor layer of a multilayer printed wiring board, for example, a copper foil having a thickness of about 18 μm is used. As a substrate material, use of thermosetting glass / epoxy resin is mainstream, and glass / polyimide resin,
Heat resistant resins such as glass and BT resin are also used.

Since a multilayer printed wiring board having six or more layers simply has a large number of conductors in the inner layer, a method of manufacturing a multilayer printed wiring board will be described below with reference to FIGS.
A method for manufacturing a six-layer multilayer printed wiring board will be briefly described.
FIG. 9A is a perspective view schematically showing a configuration of a six-layer wiring board, and FIG. 9B is a plan view schematically showing a printed pattern formed on a conductor portion of a double-sided wiring board serving as an inner layer. is there. (C) shows the side view of the jig board used at the time of lay-up mentioned later. FIG. 10 is a cross-sectional view of a six-layered wiring board, (a) shows an arrangement of components immediately before a hot pressing step, and (b) shows a single multilayer printed wiring board which is thermoset and bonded by hot pressing. It shows a state in which

As shown in FIG. 9A, a six-layer multi-layer wiring board 60 has a prepreg between two exposed conductor layers 62, 62 and two double-sided printed wiring boards 61, 61 serving as inner layers. 64, 64a, 64 are formed. On the double-sided printed wiring boards 61, 61 constituting the inner layer, single wiring board patterns 61a,... ing.

At least two reference holes 65 for positioning are previously formed in the double-sided wiring boards 61, 61, and the patterns 61a,. Thus, the positions of the patterns on the front and back sides of the double-sided printed wiring boards 61, 61 are mutually maintained in plan view. As described above, the two double-sided wiring boards 61, 61 have the reference hole 65 at the same coordinate position,
65a are used to form patterns 61a,. The pattern formed on the double-sided printed wiring board 61 serving as the inner layer board includes a single wiring board pattern 61a,.
In addition to 61a, guide marks 66, 66 (two central portions) or guide marks 6 for newly provided reference holes are provided.
66b (four at each corner, etc.) and a plurality of guide marks 66a indicating the positions of reference holes for front / back identification are prepared, and these guide marks are also formed in the etching step.

Laying up a plurality of etched double-sided printed wiring boards for an inner layer so that the positional relationship between the patterns formed on the conductors of the respective wiring boards is correctly aligned is referred to as lay-up. A jig plate 68 on which a plurality (two in the figure) of pins 68a are implanted is prepared. Normally, the pins 68a, 68a are provided at positions matching the reference holes 65, 65 already provided. In order to more accurately align the pattern of each layer of the completed multilayer wiring board, a new lay-up reference hole may be provided. By observing the guide marks 66 and 66b of the double-sided wiring board, a reference hole is formed at the coordinates newly calculated from the result. For example, if the calculation is performed using only the two guide marks 66, 66, it is considered that the deviation near the influence range 70 of the hatched portion is corrected, so the guide mark 66 on the outer peripheral portion is corrected.
b... 66b are observed, and 4 to 6 reference holes may be provided on the outer peripheral portion of the double-sided wiring board so as to reflect the deviation of the entire area of the double-sided wiring board. Of course, the same number of pins 68a are implanted on the jig plate 68 in accordance with the reference hole coordinates.

The description will continue with the case where 65 and 65 are used as the reference holes. One etched double-sided wiring board 6
1 is a pin 68 of a jig plate 68
a and 68 a are inserted and placed on the jig plate 68. A substrate material (referred to as a prepreg) 64a before the heating, on which the reference holes 65 are opened, is placed thereon. Still another double-sided wiring board 61 is stacked on the jig plate 68 by inserting the pins 68a, 68a of the jig plate 68 into the reference holes 65, 65. At this stage, the two double-sided wiring boards 61, 61
And the outer periphery of the prepreg 64a interposed therebetween is temporarily fixed to complete the lay-up.

As shown in the sectional view of FIG. 10A, prepregs 64, 64 and copper foils 62, 62 of a conductive material are provided on both sides of the two laid-up double-sided printed wiring boards 61, 61.
When the prepregs 64, 64 inserted between the copper foil 62 and the double-sided wiring board 61
The a and 64 are thermally cured to change to the (insulating) substrate 63, and the bonding between the conductors is also completed, resulting in a single multilayer printed wiring board 60 shown in FIG. Thereafter, a reference hole corresponding to the inner layer pattern of the multilayer wiring board is formed, and based on the reference hole, the outermost conductor wiring pattern is etched, a through hole is formed, and the like. Furthermore, the plating process, rust prevention process, etc., are performed, and divided into single wiring boards by machining.
The multilayer printed wiring board is completed by cutting out the required external shape.

As described above, in the process of manufacturing a multilayer printed wiring board, two types of reference holes, a reference hole for lay-up and a reference hole formed after the hot pressing step, are used. As described above, the double-sided printed wiring board forming the inner layer of the multilayer printed wiring board has guide marks 66, 66a, 66b for reference holes in addition to the patterns 61a,. The guide marks are also etched in the etching process.
Since the coordinates of these guide marks are determined so as to maintain a certain positional relationship with the patterns 61a,... 61a of the single wiring board, if the positions of these guide marks are measured, the pattern constituting the electric circuit can be obtained. Are found. Observing the plurality of guide marks 66, 66b, and the like, obtaining coordinates of a new reference hole based on the result calculated from the observation value, and drilling the reference hole, usually requires the reference hole drilling. Machine is used.

As a processing object of the reference hole punching machine, the first is a multilayer printed wiring board after the lay-up step and the hot pressing step are completed, and the second is a member constituting the multilayer printed wiring board. This is a double-sided printed wiring board before the lay-up step. That is, as the work of the reference hole punching machine, there is a multi-layered, double-sided printed wiring board, and these two will be collectively referred to as a work or simply a printed wiring board.

As described above, the front and back outer surfaces of the multilayer printed wiring board heated and pressurized by the hot press are covered with a solid conductor layer, and the guide marks formed on the inner layer by visible light with the naked eye. It is impossible to see through clearly.
In response to such cases where observation is impossible with visible light, various ultrasonic and other measurement methods that do not use visible light as observation means have been studied in various ways, and at present it is possible to see through a multilayer wiring board with weak X-rays. An X-ray (reference hole) drilling machine for observing a guide mark formed on an inner conductor layer is often used.

The above-mentioned X-ray drilling machine can observe both a multilayer printed wiring board and a double-sided printed wiring board.
If the object to be observed is a double-sided wiring board before lay-up, the conductor layer is exposed, and naturally, the guide marks can be identified by visible light. In the case of a reference hole drilling machine dedicated to double-sided wiring boards that forms a reference hole used for lay-up on a double-sided wiring board, observation means for the visible light region without using X-rays, for example, a CCD camera is an observation device. Can be used as

When a reference hole is formed by observing only the two guide marks 66, 66, only the deviation of the printed wiring board in the range of influence 70 indicated by oblique lines in FIG. 9B is corrected. In advance, four (three or more) guide marks 66b... 66b are formed at four corners of the printed wiring board, and the theoretical positions of the reference holes are calculated by observing the guide marks 66b. A multi-point sorting reference hole drilling machine for punching holes has also been put into practical use.

Next, with reference to FIGS. 11 and 12, an X-ray reference hole punching machine of the above-mentioned multi-point sorting system will be described. FIG.
FIG. 12 is a perspective view of the appearance of the X-ray reference hole punching machine 1 for the above-described application, and FIG.
(B) is a side view. Both show the interior by seeing through the housing 2. In addition, the machine coordinate system (origin O
(m, Xm, Ym, Zm) is a coordinate system fixed to an immovable portion (for example, the housing 1 or the gantry 3) of the punching machine 80, and the moving directions of various mechanical parts of the feeder are parallel to the coordinate axes. . Note that the white arrow 17 in FIG. 11 is the home position of the worker, and the worker stands in the direction of the arrow (the positive direction of the Ym axis) and holds the printed wiring board (not shown) as the work. It is loaded and taken out of the drilling machine 1 when processing is completed.

As will be described in detail later, the X movable frames 10 and 10 are placed on the frame 3 fixed to the housing 2 of the punch 80.
Is supported, and can be moved in advance in parallel with the Xm axis according to the size of the wiring board on which the reference hole is formed. The X-ray generators 4 and 4 are fixed on the upper part of the X movable mounts 10 and 10,
At the lower part, Y movable frames 11, 11 are installed so as to be movable in parallel with the Ym axis. The Y movable mounts 11 and 11 are formed in a channel shape, and the X-ray protective tube 5, the clamper 9 and the air cylinder 9a are installed on the upper part. A spindle 7 and an X-ray camera 6 are fixed to a lower part. The movable table 12 on which a printed wiring board (not shown) as a work is moved in parallel with the Ym axis.

The step of forming a reference hole will be described with reference to an example in which a guide mark is arranged at the four corners of the wiring board and a reference hole is formed in the vicinity of the guide mark. The X-moving gantry 10, 10 is moved to the observation position and waits in advance according to the external dimensions of the printed wiring board 60 or 61, which is the work, and the coordinate values of the guide marks. The movable table 12 is (1 in FIG. 11)
At the position 2 </ b> A, the operator loads a work (not shown) into a predetermined position on the movable table 12. The work is fixed to the movable table 12 by air suction or the like. The movable table 12 moves to the first observation position to move the guide marks 66b, 66
b is observed by the X-ray cameras 6 and 6. The movable table 12 moves in the Ym direction to the observation position of the next two guide marks 66b, 66b, and observes its coordinate value.
The coordinates of the reference hole are calculated using all the coordinates of the four observed guide marks 66b... 66b.

Here, the detailed calculation method is omitted, but 4
The coordinates of the reference hole are calculated from the coordinates of the guide marks, and the spindles 7, 7 move to the coordinates of the reference hole, and two reference holes are opened near the guide marks 66b, 66b observed for the second time. Next, the movable table 12 moves to reach the position of the guide mark observed first, and the spindles 7, 7 similarly move to the coordinates of the reference hole, and two reference holes are located near the guide marks 66b, 66b observed first. Drill holes. The reference holes are formed substantially near the guide marks 66b... 66b so that the distance between the reference holes becomes a fixed value. When the drilling is completed, the movable table returns to the loading position, and the operator takes out the work.

In these reference hole punching machines for printed wiring boards, the multi-layer printed wiring board, the double-sided printed wiring board, and the like, which are works, are placed on a movable table which can be moved horizontally, and observing guide marks, The work needs to be securely fixed on the movable table throughout the duration of a series of processing steps such as drilling of the reference hole and remeasurement of the drilled reference hole. Normally, a large number of air suction holes are provided on the table surface, and these holes can be connected to a negative pressure air source. When the pores have a negative pressure, the external pressure acts on the work surface, and the work is sucked and fixed to the movable table. Further, during the step of observing the guide mark by the observation means and the step of drilling the reference hole by the drilling means, the fixing by suction of the air, for example, the wiring board retainer having an H-shaped flat shape is lowered and the workpiece is moved. In some cases, the work is pressed against the movable table to prevent the movement of the work.

[0020]

As described above, means for assisting the fixation between the printed wiring board and the movable table when the movable table is stopped during the observation of the guide mark and the hole making process has already been adopted. While moving the movable table,
We have to rely only on the suction fixing method using air. If the relative position between the work and the movable table changes due to uncertainty in fixing, the accuracy of drilling the reference hole is extremely reduced. However, as part of the cost reduction of printed wiring boards, shortening of the processing time of the work has been strongly demanded, and the time of each process has been shortened, and the movable table loaded with the work has to be moved at a considerably high speed. ing. As the moving speed of the movable table increases, the acceleration during acceleration / deceleration is also increased. Due to the influence of the warpage of the printed wiring board and the like, there is a problem that the work cannot be reliably fixed to the movable table only by the air suction.

[0021]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is applied to a case and a multilayer printed wiring board or a conductor layer of a printed wiring board constituting the multilayer printed wiring board. Observing means for observing the guide mark, punching means for perforating a reference hole in the multilayer printed wiring board or printed wiring board, and a movable table for mounting the multilayer printed wiring board or printed wiring board and moving on a straight line And a control hole for calculating a coordinate value of the reference hole from the observation result of the guide mark, driving the observation means, the hole making means, and the movable table by a series of programs, and moving the reference table to a required position. A pressing member that presses the mounted multilayer printed wiring board or printed wiring board against the movable table with or without the relative movement between the housing and the movable table with the opening machine. Providing machine drilled reference holes holes with.

The pressing member is a roller having a cylindrical portion rotatably supported by a holding member guided by a supporting member fixed to the housing, and the axis of the rotation axis of the roller is the movable table. Is parallel to the table surface and perpendicular to the moving direction of the movable table. It is proposed that the surface of the cylindrical portion of the roller be made of a multilayer printed wiring board to be pressed or an elastic material softer than the surface of the printed wiring board. Further, as another configuration, when the pressing member presses the multilayer printed wiring board or the printed wiring board against the movable table, the reference hole drilling is configured such that the relative position between the pressing member and the movable table is unchanged. In addition, it has been proposed that the contact portion of the pressing member with the multilayer printed wiring board or the printed wiring board is made of a material softer than the surface of the multilayer printed wiring board or the printed wiring board.

By observing the guide marks formed on the double-sided printed wiring board, which is a component of the multilayer printed wiring board,
In a reference hole drilling machine that drills reference holes in a multilayer printed wiring board or a double-sided printed wiring board that is a work, the work placed on the table top is usually fixed by negative-pressure air suction. By providing a pressing member that keeps pressing the work during the entire period of a series of main processing steps, the work can be reliably fixed at the time of high-speed movement of the movable table or at the time of rapid acceleration / deceleration.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of an X-ray reference hole drilling machine according to an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a perspective view schematically illustrating the external appearance of an X-ray drilling machine 1 according to an embodiment of the present invention. In order to show the external shapes and positions of a wiring board retainer 71 and a retainer roller 72 and their accessories. The X movable gantry 10, the Y movable gantry 11, and the like are shown broken at various points. FIG. 2 shows a projection of a movable table on which a printed wiring board as a work is placed. FIG. 3 shows the vicinity of the X-moving gantry 10 and the Y-moving gantry 11, which are main parts of the drilling machine, as projections in various directions. FIG. 4 and subsequent drawings are explanatory views of the vicinity of the wiring board press 71 and the press roller 72.
Details will be individually described later.

The mechanical coordinate system (the origin is Om, and the three orthogonal axes are represented by Xm, Ym, and Zm) described in each drawing is attached to an immovable portion (for example, the housing 2 or the gantry 3) of the punching machine 1. In a fixed coordinate system, the direction of movement of the various mechanical parts by the feeder is parallel to these coordinate axes. The coordinate value obtained by observing the guide mark of the printed wiring board with the X-ray camera and the coordinates of the reference hole are basically calculated using this coordinate system. The white arrow 17 in FIG. 1 is the home position of the worker, and the worker stands in the direction of the arrow (positive direction of the Ym axis) to perform guide mark observation and reference hole drilling. (Not shown) and taken out of the drilling machine 1 when the processing is completed.

The X-ray reference hole drilling machine shown in FIG.
It can be considered that the circuit board retainer 71 and the retainer roller 72 and a mechanism for supporting and driving them are added to the punching machine outlined with reference to FIGS. Therefore, after describing the function of each part along the operation procedure of the reference hole punching machine, the features of the above-described wiring board press 71 and the press roller 72 will be described.

In the following description, it is assumed that the reference hole drilling method uses a calculation method called a multi-point distribution method.
That is, as shown in FIG. 9B, for example, by observing four guide marks 66b... 66b arranged at four corners of a printed wiring board which is a work, coordinates forming a guide mark group are observed. The system is estimated, and the optimum coordinate value of the reference hole is calculated according to the coordinate system. For the convenience of using the jig, the reference holes are sorted so that the distance between the reference holes matches the design value, and the reference holes are drilled accordingly. If there is no error in the manufacturing process of the multilayer printed wiring board, the coordinates of the reference hole and the coordinates of the guide mark should match, but due to various errors during manufacture, etc., the guide marks 66b.
The actual observed value of b does not match the designed value. However, since the deviation is small, the reference hole is formed near the guide marks 66b... 66b. In addition, since the calculation formula of this multipoint distribution method is known variously,
No particular mention is made here. Although the actual reference hole and the guide mark may have different coordinate values and numbers, the case where the reference hole and the guide mark have the same coordinate value and number in design will be described in order to prevent confusion.

A gantry 3 is fixed inside a housing 2 of the drilling machine 1. The pair of left and right X movable frames 10 and 10 are formed substantially in the shape of a channel, and have a mirror image relationship between the left and right. The X movable gantry 10, 10 is supported by linear guides 10a, 10a arranged at the upper end of the gantry 3. The ball screw 10b and a ball nut (not shown) attached to the lower surface of the X moving base 10 engaged with the ball screw 10b are moved in advance in parallel with the Xm axis according to the size of the wiring board on which the reference hole is formed. The guide mark is waiting at a position where it can be observed. In addition, in order to individually drive the X movable gantry 10, 10, the ball screw 10b
Are arranged for each X-moving gantry 10.

The X-ray generators 4 and 4 are fixed to the upper part of the X-movement mounts 10 and 10, and the linear guides 11a and 11
a is attached. Then, the Y moving base 11, 1
1 is supported by the linear guide 11a. By means of the ball screw 11b and a ball nut (not shown) attached to the lower surface of the Y-movement gantry 11 that engages with the ball screw 11b, the Y-movement gantry 11, 11 can move in parallel with the Ym axis. The Y movable mounts 11 and 11 are formed in a channel shape, and an X-ray protective tube 5 is disposed on an upper portion thereof. As shown in FIG.
a is installed. A spindle 7 and an X-ray camera 6 are fixed to a lower part.

The movable table 12 on which the multilayer printed wiring board is mounted is driven and driven by a linear guide 12a and a ball screw 12b which are arranged parallel to the Ym axis and fixed to the center of the housing, and move parallel to the Ym axis. I do. The movable table 12 is placed at a position 12A, on which a multilayer printed wiring board for forming a reference hole, which is a work, is placed, and is moved along the Ym axis to measure a guide mark and to be drawn into the reference hole. Note that a control device that drives the ball screws 10b, 11b, and 12b and controls the movements of the X movable frames 10, 10 and the Y movable frames 11, 11, and the movable table 12 is not illustrated.

Here, the main components of the drilling machine are as follows:
X-ray generator 4, X-ray protective tube 5, and guide mark observation device with X-ray camera 6, drilling device with spindle 7 and clamper 9, X-moving gantry 10, Y-moving gantry 11, movable table 12, and these are supported. Linear guide 1
0a, 11a, 12a, ball screws 10b, 11b, 1
Each of the driving devices is formed by 2b or the like. Further, a control device (not shown) controls the above-described various devices according to a series of drilling work procedures. The most important role is to calculate the coordinate value from the X-ray image of the guide mark observed by the observation device, and to calculate the reference hole drilling position from the coordinate value and the design coordinates of the reference hole input in advance.

The four guide marks 66b,..., 66
An observation method of the multilayer printed wiring board 60 shown in FIG. 2C in which b is formed at four corners will be described. First, the outer dimensions of the wiring board to be drilled and the guide mark 66b (designed) are used.
The positions along the Xm axis of the X movable frames 10, 10 are determined from the coordinate values of 66b and 66b.
Is moving there and waiting. When the movable table 12 is at the position 12A (FIG. 11), the operator places the multilayer printed wiring board 60 at a predetermined position on the movable table 12.
The multilayer printed wiring board 60 is temporarily fixed to the movable table 12. The guide marks 66b, 66b to be observed first are X
The movable table 12 moves to a position below the X-ray generating tube 4a built in the X-ray camera 4. Guide mark 66
b and 66b are observed through the X-ray cameras 6 and 6 through X-rays, and the coordinate values of the guide marks 66b and 66b are measured.
The coordinate values are stored in a memory of a control device (not shown). 2
The movable table 12 moves in the Ym direction by the distance that the guide marks 66b, 66b to be observed for the second time are below the X-ray generating tube 4a. Then, X-rays are irradiated, and the X-ray camera 6,
In step 6, the guide marks 66b, 66b are observed, and the coordinate values of the guide marks 66b, 66b are stored.

Here, although the calculation method is omitted, the reference holes H1, H2, and H are calculated based on the coordinates of the four observed guide marks.
3. Calculate the coordinates of H4. First, the spindles 7, 7 are moved to the coordinates of the reference holes H3, H4.
Drill H4. Next, the movable table 12 moves to reach the positions of the reference holes H1, H2, the spindles 7, 7 move to the coordinates of the reference holes H1, H2, and the reference holes H1, H2.
Drill holes. The reference holes H1 to H4 are not shown. When the movable table moves to the loading position 12A and the operator removes the perforated wiring board 60, the reference hole processing step ends.

With reference to FIG. 3, how the devices mounted on the X, Y moving gantry operate during the above-described processing will be described.
FIG. 3 (a) shows the X movable gantry 10, Y on the left side from the worker position.
FIG. 2B is a front view of the movable gantry 11, and FIG. (C) and (d) show the X-moving gantry 10 viewed from the plus direction of the Xm axis, (c) schematically showing the observation of the guide mark by the X-ray camera 6, and (d) schematically showing the drilling by the spindle. Is shown in

The observation of the guide marks 66b... 66b is performed at the X-ray observation position shown in FIG. An X-ray protective tube 5 and an X-ray camera 6 are located immediately below the X-ray generating tube 4a.
The X-ray generator is activated by a command from a control unit (not shown), and the X-rays emitted from the X-ray generation tube 4a pass through a hole 5a formed in the center of the X-ray protection tube, and although not shown, a movable table (not shown) is used. One of the guide marks on the inner layer of the wiring board 60 placed on the substrate 12 is seen through and captured as an image by the X-ray camera 6, and the image is sent to a computer in the control device to calculate the coordinates of the guide mark. Is stored. Usually, two guides are observed by two cameras with two observations.
The coordinates of the reference hole are calculated from this data.

Drilling of the reference hole is performed by a drill 7b at the tip of the spindle. At the time of drilling, the movable table 12 moves according to the calculated coordinate value of the reference hole, and
0 moves to the Xm coordinate of the reference hole H1, and the Y moving
1 is finely adjusted to move to the Ym axis coordinate of the reference hole H1. Since the Y-movement gantry 11 is always set to move with reference to the center of the X-ray camera 6, the Y-axis gantry 11 is actually located at the center of the X-ray camera 6 and the center of the spindle 7 as shown in FIG. Move more by distance S. The spindle 7 is a high-speed motor using an air turbine or a high-frequency motor as a rotation source.
A reference hole is drilled in the wiring board by mounting a drill 7b made of a cemented carbide normally through a. Although not shown,
The cutting and feeding of the drill 7b is performed by an air cylinder or a servomotor that moves the spindle 7 up and down. A clamper 9 disposed directly above the spindle 7 is an air cylinder 9a.
When it descends, it presses down on the wiring board 60 placed on the movable table 12 to prevent the movement of the wiring board 60 at the time of drilling. The above is a typical processing procedure of a drilling machine that observes a guide mark and drills a reference hole based on the observation result.

It has already been mentioned that the work needs to be securely fixed on the movable table throughout the duration of the series of working steps described above. Normally, a large number of air suction holes are provided on the table surface, and these holes can be connected to a negative pressure air source. When the pores become negative pressure, the external pressure acts on the work surface, and the work is apparently sucked by the movable table and fixed to the movable table. Further, during the step of observing the guide mark by the observation means and the step of making the reference hole by the hole making means while the movable table 12 is stopped, the H-shaped plane shown in FIG. In some cases, the wiring board retainer having a shape moves down to press the work against the movable table to prevent the movement of the work.

In order to securely fix the work to the movable table while the movable table 12 is moving, the wiring board retainer 71 and the retainer roller 72 press the work against the movable table to assist the suction by the air. Prevent movement. As shown in FIG. 1, the wiring board holding support 73 is fixed inside the ceiling of the housing 2, and the wiring board holding 71 and the holding roller 72 are suspended. When both of them descend, they press the table 12 via the printed wiring boards 60 and 61. The left and right grooves formed in the wiring board retainer 71 coincide with the observation and drilling positions.

The detailed structure is shown in FIGS.
(A) is a perspective view showing a wiring board retainer 71 and a retainer roller 72, and (b) is an exploded perspective view of a central portion. FIG. 5 is a three-sided view of the printed circuit board press 71 and the press roller 72 projected thereon.
In order to clarify the arrangement of the printed wiring boards 2 and the printed wiring boards 60 and 61 as workpieces, the X movable frames 10, 10 and the Y movable frames 11, 11 and members attached thereto are seen through to
It is entered with a dotted line. FIG. 6 is a sectional view of the central part of the wiring board retainer 71 and the retainer roller 72, and shows the operation thereof.

Wiring board holding support 73 and mounting bracket 73a
Are integrated, and are fixed to the inside of the ceiling portion of the housing 2 by bolts via the mounting holes 74b... 74b. The main body portions of driving means 71a and 72a such as an air cylinder and a linear motor for moving the wiring board press 71 and the pressing roller 72 in the Zm direction are fixed to the wiring board holding support 73. The mounting frame 71b is fixed to the lower end of the actuator 71g of the driving means 71a.
The lower end of the actuator 72g is fixed to the support frame 72b through an actuator escape hole 71f formed in the mounting frame 71b and having an inner diameter larger than the outer diameter of the actuator 72g. FIG. 4B is an exploded view, and the actuators 71 shown in parentheses are denoted by reference numerals.
The lower ends of g and 72g are divided and further extended.

The wiring board retainer 71 is formed of a thin metal plate or the like, has a rectangular outer shape whose longitudinal direction is parallel to the Xm axis, has grooves on the left and right sides, and has a rectangular retainer roller hole 71c in the center.
have. The mounting frame 71b has a relief groove 71d parallel to the Xm axis.
Are formed, and the above-described pressing roller hole 71c and the escape groove 71 are formed.
The lower ends of d are aligned, two angles 71e, 71e are applied to the left and right sides of the mounting frame 71b, and these four members are integrally connected. Therefore, when the actuator 71g of the driving means 71a moves downward, the wiring board retainer 71 moves down.

Two pressing roller bearing holes 72c provided near the lower end of the channel-shaped support frame 72b,
Both ends of the pressing roller shaft 72d are rotatably supported by 72c. Further, a cylindrical pressing roller 72 is fixed to the outer periphery of the pressing roller shaft 72d by bonding or the like. The support frame 72b to which the pressing roller 72 is mounted is accommodated in a space formed by the escape groove 71d and the angles 71e, 71e of the mounting frame 71b, and guided by these, the rotating shaft 72d of the pressing roller 72 moves the movable table 12 Are kept parallel to the surface and parallel to the Xm axis. That is, the roller 72 moves in the moving direction of the movable table 12 (parallel to the Ym axis).
Turn at right angles to. In FIGS. 1 and 4A, a rectangular window is provided in the front part of the mounting frame 71b in order to show the pressing roller 72.
It is preferable to close the front part as shown in FIG.

As shown in FIG. 5, the circuit board press 71 and the press roller 72 are connected to the table 12 and the printed circuit board 6.
It is located above 0, 61 and below the X-ray protective tube 5 and clamper 9. When the clamper 9 descends, it enters the groove of the wiring board retainer 71 and directly presses the printed wiring boards 60 and 61. As described above, in the Xm and Ym planes, the wiring board retainer 71 and the retainer roller 72 are fixed to the housing 2, and the position in FIG. 5 is independent of the position of the movable table 12, Does not interfere with exercise. When both the wiring board holder 71 and the holding roller 72 are lowered, the printed wiring boards 60 and 61 on the movable table are pressed against the movable table to fix the work. While the wiring board retainer 71 can be used only when the movable table is stopped,
Since the pressing roller can rotate in the moving direction of the movable table, it exerts a pressing effect even when the movable table moves. The contact surface between the wiring board retainer 71 and the press roller 72 with the work is used to protect the surface of the work, so that a soft elastic body is attached to the contact surface of the wiring board retainer 71 with the work, and the press roller 72 holds the work. It is preferable to use a material having appropriate elasticity without damaging it. Specifically, any elastic material such as a metal or resin softer than the surface hardness of the work may be used.

With reference to FIG. 6, the operation of the wiring board press 71 and the press roller 72 will be described. FIG. 6A shows Xm, Z
6B, 6C, and 6D are parallel to the m-axis and a plane including the axis of the rotating shaft 72d, and FIGS. 6B, 6C, and 6D are parallel to the Ym and Zm axes and the Ym direction of the drilling machine. It is cut along a plane including the center line. In addition, FIG. 7, which shows a processing procedure of one work as a flowchart, will be appropriately referred to during the description.

When the work is not inserted, FIG.
As described above, the wiring board retainer 71 and the retainer roller 72 are raised by a distance a and escape. The work is loaded and sucked by the movable table. The movable table moves to the observation position in the + Ym direction. (1-2 in FIG. 7) As shown in FIG. 6 (c), the wiring board press 71 and the press roller 72 descend to press the work. The two guide marks Nos. 1 and 2 located on the + Ym side of the work are observed, and their coordinates are stored. The wiring board retainer 71 rises. (3-5 in FIG. 7)

As shown in FIG. 6 (d),
Although 1 rises, the pressing roller 72 continues to press the work. The movable table moves, and the placed work also moves. (6 in FIG. 7) As described above, the pressing roller 72 can rotate at right angles to the moving direction of the movable table 12 (parallel to the Ym axis).
A force parallel to the m-axis is not exerted, and only a force for pressing the work to the movable table 12 in the Zm direction (vertical direction) is applied from the pressing roller 72 to prevent a deviation between the work and the movable table.

When the work reaches a position at which another guide mark position can be observed and the movable table 12 stops, FIG.
As shown in (c), the wiring board retainer 71 descends again, observes the third and fourth guide marks located on the −Ym side, takes in the coordinate values, and calculates the coordinates of the reference hole. According to the coordinates calculated here, the third and fourth reference holes are drilled. Next, the wiring board retainer 71 rises. (7 to 10 in FIG. 7) As shown in FIG. 6D, the pressing roller 72 presses the work during the movement of the work to prevent the work from shifting, as in the above description. (11 in FIG. 7)

Returning to the first and second guide mark positions, the wiring board retainer 71 is lowered, and the reference holes 1 and 2 are opened. (12 to 13 in FIG. 7) Since all the processing has been completed, as shown in FIG. 6B, the wiring board press 71 and the press roller 72 are both raised. The movable table 12 moves to the discharge position, the air suction is stopped,
The work is taken out. (14 to 16 in FIG. 7) As described above, the wiring board retainer 71 cannot be used while the movable table is moving, whereas the retainer roller 72 is a series of parts that dislike the displacement between the work and the movable table during the entire stroke. The work can be continuously pressed over the observation hole forming step.

Next, another embodiment of the present invention will be described. In the above-described example, the supporting portion of the pressing member such as the pressing roller is fixed to the housing, but the supporting portion may be fixed on the movable table. This will be described with reference to FIG. FIG.
(A) and (b) show one example, FIG. (A) is a projection view in + Ym direction of a machine coordinate system taken along the line AA in (b), and FIG. It is a projection view of the -Xm-axis direction which made the cross section in the center. The lower end of the channel-shaped holding plate support 77 is fixed to the tip and the center of the movable table 12 in the + Ym direction, and the driving means 72a is fixed to the upper end. A holding plate arm 76a is fixed to the lower end of the actuator 72g, and a flat holding plate 76 is fixed to the lower surface of the holding plate arm 76a by bonding or the like.
The plane shape is a rectangle in the figure, but may be a circle or another shape as long as the pressing area is appropriate. The pressing plate 76 presses the printed wiring boards 60 and 61, which are the works placed on the surface of the movable table 12, by the lowering of the actuator 72g of the driving means 72a, thereby preventing the displacement with the movable table 12. Even if the movable table 12 moves with respect to the housing 2, the relative position between the holding plate 76 and the movable table 12 does not change, and the work can be kept pressed.

The mounting bracket 73a integrated with the wiring board holding support 73 is fixed to the housing 2, the driving means 71a is mounted, and the lower end of the actuator 71g is mounted on the mounting frame B.
(75a). Wiring board holder B (75)
Is a holding plate 76 that performs the same movement as the movable table 12.
In order not to interfere with the supporting part, the central part is made hollow. The mounting frame B (75a) is formed in a channel shape with a void in the Ym-axis direction.
Angles 71e, 71e are combined and integrated. At the center of the wiring board retainer B (75), the retainer roller hole 71c shown in FIG. 4 (b) is enlarged in the + Ym direction to form a rectangular recess continuously with the outside, and is further strengthened in the -Ym direction for reinforcement. It protrudes. The left and right portions have substantially the same shape as the wiring board retainer 71 already described with reference to FIG. That is, it is different from the above-mentioned wiring board retainer 71 in that the back side + Ym direction of the central portion is vacant.

When the movable table 12 is moved to the maximum in the -Ym direction, the holding plate arm 76a and the holding plate 76 are located in the central space of the wiring board holding B (75) and the mounting frame B (75a). Since the movable table 12 is placed at a position where the movable table 12 can be moved, the two do not interfere with each other. The surface of the wiring board press B (75) that presses the work is made of a material such as metal or resin that is softer than the surface hardness of the work as in the case of the roller of the previous example. It is preferred to be made of a material.

In the actual work process of the work, the state of the lowering of the wiring board press B (75) and the presser plate 76 is the same as the flow chart of FIG. Only the work is held down, while the holding plate 76 keeps holding the work over the entire machining process, similarly to the holding roller 72 of the previous example. Comparing the pressing roller 72 and the pressing plate 76, the former pressing roller 72 presses the work while rotating when the movable table moves, but always presses the vicinity of the processing point and the latter pressing plate 7.
Reference numeral 6 indicates that the movable table 12 is kept stationary and presses the work irrespective of the movement of the movable table 12, but the distance between the pressed position and the processing point may increase. In the latter case, since the length of the movable table 12 in the Ym-axis direction is large, the depth of the machine is increased, and the advantages of comparing the two are advantageous and disadvantageous. The choice should be made based on the overall requirements for the drilling machine.

8 (c), (d) and (e) show the holding plate 7
6 illustrates another support method. (C) is a perspective view, FIG. (D) is a projection view in the + Ym-axis direction of the machine coordinate system taken along the line BB of FIG. (E), and FIG. FIG. 14 is a projection view in the −Xm axis direction. (D) and (a) and (e) and (b) correspond from the direction and position of projection. The two angle-shaped holding plate receiving plates 76c, 76c are fixed to the end of the center (in the + Ym direction) at the back of the movable table 12 so as to have a mirror image relationship. The end of the driving means 72a is rotatably supported near the upper ends of the holding plate receiving plates 76c, 76c. One end of a prismatic holding plate arm 76a is rotatably supported by a shaft 76d held parallel to the Xm axis below the holding plate receiving plates 76c, 76c. The holding plate 76 is fixed to the lower surface of the other end of the holding plate arm 76a, and the tip of the actuator 72g of the driving means 72a is rotatably supported by the intermediate projection 76b.

The wiring board retainer B (75) and the mounting frame B (75)
a) and the like have the same shape as those shown in FIGS. 8 (a) and 8 (b). In these central vacancies, the holding plate 76
As in the previous example, one end of the holding plate arm 76a to which is attached is positioned. When the driving means 72a operates to extend the actuator 72g to the left, the projection 76b is pushed to the left, and the holding plate arm 76a turns around the axis 76d in the direction of the arrow in FIG. The plate 76 presses the work (60, 61) against the movable table 12. The movement of the holding plate 76 only changes from a linear movement to a rotation movement, but does not functionally change from that shown in FIGS.

As described above, even if there are differences in the outer diameter of the pressing member such as a flat plate or a cylinder, differences in the movement path such as a straight line or an arc, and differences in the support portions such as the housing and the movable table. Once the printed wiring board is pressed, the pressing is continued until all the main steps are completed. Therefore,
As can be seen from the above several examples, there is a great degree of freedom in selecting the type of mechanism to be adopted and the material of each member.

[0056]

As described above, according to the present invention, in a reference hole punching machine for observing guide marks of printed wiring boards having various external shapes and drilling reference holes, a printed wiring board as a workpiece is formed. The work can be reliably fixed to the movable table, not only contributing to the improvement of the precision of the product, but also sufficient work can be fixed to the table even if the feed speed of the movable table or the acceleration during acceleration / deceleration increases. The effect of saving the processing cost by shortening the processing time is great. Further, by selecting the material of the portion in contact with the printed wiring board, the risk of damaging the product can be reduced.

Further, since some members are added to the wiring board retainer used when the table is stopped at the time of observation, drilling, and the like, which has been conventionally used, and the table is moved, the cost increase is small, and the drilling machine is not required. There are many effects to increase product value.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically illustrating the appearance of a reference hole punching machine according to an embodiment of the present invention.

FIG. 2 is a plan view and a side view of a movable table for explaining an arrangement of a wiring board mounted on a table of the punch shown in FIG. 1;

FIG. 3 is a projection view schematically illustrating the operation of the reference hole punching machine according to the embodiment of the present invention.

FIG. 4 is a perspective view and an exploded perspective view illustrating a roller-type wiring board pressing and fixing mechanism as an example of an embodiment of the present invention.

FIG. 5 is a projection view of a roller-type wiring board pressing and fixing mechanism.

FIG. 6 is a cross-sectional view illustrating the operation of a roller-type wiring board pressing and fixing mechanism.

FIG. 7 is a flowchart illustrating the operation of the wiring board pressing and fixing mechanism.

FIG. 8 is a perspective view and a projection view of a lever-supporting wiring board pressing and fixing mechanism according to another embodiment of the present invention.

FIG. 9 is a schematic diagram illustrating a lay-up step in a manufacturing process of the multilayer printed wiring board.

FIG. 10 is a cross-sectional view schematically showing a configuration of a multilayer (six-layer) wiring board.

FIG. 11 is a perspective view showing a configuration of a conventional reference hole punching machine for punching a reference hole in a printed wiring board.

FIG. 12 is a front view and a side view illustrating the operation of a conventional reference hole punching machine.

[Explanation of symbols]

1 drilling machine, 2 housing, 3 gantry, 4 X-ray generator, 4a X-ray generating tube, 5 X-ray protective tube, 6 X-ray camera, 7 spindle, 7a chuck, 7b drill,
7c air cylinder, 8 spindle, 9 clamper,
9a Air cylinder, 10X movable frame, 11Y movable frame, 12 movable table, 10a, 11a, 12a
Linear guide (LM guide), 10b, 11b, 12b
Ball screw, 17 worker position (open arrow), 60
Multilayer printed wiring board, 61 Double-sided printed wiring board, 61
a Single wiring board pattern, 62 conductors, 63 (insulated) substrate, 64, 64a prepreg, 65, 67 reference hole, 66 guide mark, 69 maximum wiring board outline, 69
a Minimum wiring board outer shape, 70 influence range, Ha front / back identification guide mark, 71 wiring board holding, 71a driving means, 71b mounting frame, 71c holding roller hole, 71
d Escape groove, 71e, 71e Angle, 71f Actuator escape hole, 71g Actuator, 72 Holding roller, 72a Driving means, 72b Support frame, 72c
Holding roller bearing (hole), 72d rotating shaft, 72g
Actuator, 73 Wiring board holding support, 73a
Mounting bracket, 74b Mounting hole, 75 Wiring board holder B, 7
5a Mounting frame B, 76 holding plate, 76a holding plate arm, 76b projection, 76c holding plate arm receiving plate, 76
d-axis, 77 holding plate support, 80 hole drilling machine (conventional model),

Continued on the front page (72) Inventor Tsutomu Saito 1-1-1 Akanehama, Narashino-shi, Chiba F-term (reference) in Seiko Precision Co., Ltd. 3C036 AA01 LL08 3C060 AA11 BA05 BG13 BG15 CF16

Claims (5)

[Claims] 1. A housing, observation means for observing a guide mark formed on a conductive layer of a multilayer printed wiring board or a printed wiring board constituting the multilayer printed wiring board, and the multilayer printed wiring board or the printed wiring. Perforating means for perforating a reference hole in a board, a movable table for mounting the multilayer printed wiring board or the printed wiring board and moving on a straight line, and a coordinate value of the reference hole from an observation result of the guide mark. And a control means for driving the observing means, the drilling means and the movable table according to a series of programs, and for moving the movable table to a required position. The mounted multilayer printed wiring board or the printed wiring board is pressed against the movable table regardless of the presence or absence of the relative movement of the movable table. Reference hole drilling machine, characterized in that it comprises a member. 2. The roller according to claim 2, wherein the pressing member is a roller having a cylindrical portion and rotatably supported by a holding member guided by a supporting member fixed to the housing. Parallel to the table surface of the movable table,
2. The reference hole punching machine according to claim 1, wherein the direction of movement of the movable table is orthogonal to the direction of movement of the movable table. 3. The reference hole according to claim 2, wherein the surface of the cylindrical portion of the roller is an elastic body that is softer than the surface of the multilayer printed wiring board or the printed wiring board to be pressed. Opener. 4. When the pressing member presses the multilayer printed wiring board or the printed wiring board against the movable table, a relative position between the pressing member and the movable table remains unchanged. Item 6. A reference hole punching machine according to item 1. 5. The multi-layer printed wiring board or the contact portion of the pressing member with the multilayer printed wiring board is formed of a material softer than the surface of the multilayer printed wiring board or the printed wiring board. The reference hole punching machine according to claim 4.