JPH0823143A - Printed board - Google Patents

Abstract

PURPOSE:To permit manpower saving in the production process for printed boards by efficiently performing programming work for a mounter. CONSTITUTION:A printed board 20 is provided with disposal plates 24 to 30, a plurality of lands L, reference holes 42, etc. Position marks M indicate a mounting position that must be measured when electric parts are to be mounted by using a mounter. In an example, position marks M1 to M3 indicate a central point of an IC conforming to DIL and position marks M4 and M5 indicate a central point of an LSI conforming to GFP, respectively. Actual-size scales 50 and 52 are formed on the plates 24 and 26 respectively and they show an X-Y coordinate axis of the board 20 in which the central point of the hole 42 is an origin. Since the marks M and scales 50 and 52 are formed in an etching process, the board can be produced in high dimensional accuracy reflecting accurate and actual size as well as in high positional accuracy with a help of the hole 42 indicating an origin position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a print that performs a desired function by forming a predetermined electric circuit pattern by an etching process and automatically mounting electronic parts according to the electric circuit pattern by a mounting machine. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board, and more particularly to a printed circuit board improved in order to save labor in a mounting machine.

[0002]

2. Description of the Related Art Conventionally, an apparatus for automatically mounting components has been proposed in order to reduce the mounting cost of the components on a printed circuit board. In a component mounting step of mounting an electronic component on a printed circuit board, a mounting machine is provided that specifies a component mounting position on the printed circuit board in advance and automatically arranges a predetermined electronic component here. Therefore, by using this mounting machine, it becomes possible to mount small and diversified electronic components at a predetermined component mounting position quickly and reliably without any human intervention in the component mounting process. Labor saving has been achieved.

[0003]

However, even with the various techniques proposed above, the effect of introducing the mounting machine cannot be maximized, and a great deal of manpower is still required for the production of printed circuit boards. In some cases, it was necessary and the production efficiency could not be improved as expected.

A mounting machine for electrical parts is a kind of NC machine tool, and in order to operate this mounting machine as intended, a program such as inputting the mounting position for each electronic part mounted on the printed circuit board is required. Work is required. However, since this program work occupies an area corresponding to the electronic components mounted on the printed circuit board, it involves the ideal work of measuring while assuming a predetermined point (for example, the center point) of the occupied area. , It is a human-dependent manual work.

Since the measurement of the component position and the program work corresponding thereto are performed assuming the center point of the component mounting position and the like, the work probably includes the cause of human error. Was there. In addition, it may be difficult to specify the position of the center point for parts that do not have symmetry in the mounting pin placement on the board, and the mounter should be operated based on the component mounting position that was once measured and input. After checking the program, it is often necessary to make corrections such as fine adjustment of the mounting position again. These have been major problems in printed circuit board assembly work.

Moreover, as the printed circuit board becomes more sophisticated, the number of mounting components and their types increase, and such an increase in the work of measuring the mounting position and inputting work to the mounting machine is a problem that cannot be overlooked. Of course, when designing a printed circuit board (artwork) by CAD, the CAD design data is transferred directly to the component mounter,
Although it has been implemented that the measurement of the mounting position and the programming work are unnecessary, it is not always easy to transfer the data.
In many cases, it is easier to measure and input the mounting position at the site, and the measurement of the mounting position (center point) and the inputting of the mounting position data still exist as realistic work.

The printed circuit board of the present invention has been made for the purpose of solving these problems and simplifying the measurement of the component mounting position to greatly improve the production efficiency of the printed circuit board.

[0008]

In the printed circuit board of the present invention, a predetermined electric circuit pattern is formed by an etching process, and electronic parts according to the electric circuit pattern are automatically mounted by a mounting machine to have a desired function. In the printed circuit board that fulfills the above, on the component mounting surface on which the electronic component is mounted,
A predetermined position mark is formed at a position where a center point of the electronic component is located when the electronic component is mounted.

[0009]

In the printed circuit board of the present invention configured as described above, since the position of the center point of the electronic component is displayed by the position mark formed on the component mounting surface, the center point of the mounting position of the component is measured. Will be easier.

Although the method of forming the position mark is arbitrary, if the position mark is formed by using the etching process for forming the electric circuit pattern on the printed circuit board, the accuracy is superior to the case of forming by silk printing. Of course, it may be formed by silk printing, and in this case, there is an advantage that the formation of the position mark is easy. It is also preferable to form a scale on the periphery of the printed board in order to specify the position of the position mark. In this case, the printed circuit board is generally provided with a reference hole in order to determine the origin position, and the reference hole or the distance from the reference hole where the position from the reference hole is easy to identify (for example, a board corner). The center point of the electronic component may be specified by. In this case, it is preferable that the scale is formed on the discarded plate portion of the printed circuit board so that the scale does not remain on the completed printed circuit board. A scale may be provided on the side of the jig for measuring the center point. In this case,
It is not necessary to form a scale for each printed circuit board.

[0011]

EXAMPLES In order to further clarify the constitution and operation of the present invention described above, preferred examples of the printed circuit board of the present invention will be described below. FIG. 1 is an explanatory diagram of a component mounting surface S of a printed circuit board 20 that is an embodiment. As shown in the figure, the printed circuit board 20 of the present embodiment has four discard plates 24 to 30 and DIL (Dual-In-L) which can be separated by a broken portion 22 in which a large number of perforations are arranged and can be discarded.
ine-Plastic Package), QFP (Q
a plurality of lands L formed by a known etching process for mounting ICs or LSIs of packages conforming to standards such as uad-Flat-High-Package), and holes for defining the origin position of the printed circuit board 20. Also, two 4 [phi] reference holes 42 and an electric circuit pattern (not shown) on the back surface are provided in the same manner as a general printed circuit board.

The printed circuit board 20 of this embodiment also has the following unique components.

First, five position marks M (M1 to M5)
Is a mark provided at a position where the center point of the electronic component is mounted on the component mounting surface S of the printed circuit board 20 by a mounting machine (not shown), that is, measured when mounting the electronic component using the mounting machine. The mounting position that must be done is displayed. These position marks M are formed simultaneously by using the etching process for forming the land L and the electric circuit pattern, and are formed under strict control with the reference hole 42 in the upper right corner of the drawing as the reference position. It Therefore, the position mark M has high positional accuracy with the reference hole 42 as the reference position.

The position mark M of this embodiment has a DI
Three position marks M1 that display the center point of the L-compliant IC
.About.M3 and two position marks M4 and M5 for displaying the center point of the QFP compliant LSI.

Next, the two actual scales 50 and 52 are
Similar to the position mark M, it is formed on the discarding plates 24 and 26 by using the etching process, and the origin of measurement of the printed circuit board 20 itself is the upper right corner of the circuit board as shown in the drawing. is there. Full scale 50, 52
Displays the XY coordinate axes with the upper right corner of the substrate as the origin. This actual scale 50 of the board,
Since 52 is formed with the reference hole 42 as a reference position, the actual scales 50 and 52 are also scales having both dimensional accuracy accurately reflecting the actual size and high positional accuracy, like the position mark M. .

The printed circuit board 20 of the embodiment having such unique components is mounted on, for example, the mounting position measuring jig 60 shown in FIG. The position of M5, that is, the coordinate value to be input to the mounting machine can be easily measured.

As shown in FIG. 2, a mounting position measuring jig 60.
The main body is an approximately rectangular parallelepiped case having an insertion groove 62 for slidingly inserting the printed circuit board 20 formed on the side wall, and a pair of short strips for sandwiching the discard plates 24 and 26 on which the actual scales 50 and 52 are drawn. The long side walls 64 and 66 are provided with linear body slide grooves 74 and 76 into which the insertion pins 70 and 72 are slidably fitted. In the main body slide grooves 74 and 76, linear ruler slide grooves 82 and 84 in which the insertion pins 70 and 72 are also slidably fitted are freely slidably fitted to the short and long sides of the L-shaped plate bent at 90 degrees accurately. The L ruler 86 is punched and attached through an insertion pin. In addition, a thin measuring needle 88 which is vertically provided upright from the L-shaped plate and reaches the printed circuit board 20 is provided at the bending apex of the L ruler 86. In addition, here, the insertion pins 70, 7
If the clearance between the outer shape of No. 2 and the ruler slide grooves 82, 84 is set to a predetermined value or less, it is easy to suppress the error due to the inclination of the L ruler 86 to the required accuracy or less. Of course, it is also possible to suppress the rattling by making the cross section of the insertion pins 70 and 72 into a rectangular shape or the like.

The printed circuit board 20 is mounted on the mounting position measuring jig 60 having the above-mentioned structure with the reference hole 42 as a reference, and each position mark M drawn on the printed circuit board 20.
If the measuring needle is aligned with, the position of each position mark M with the origin at the upper right corner of the substrate is the L ruler 86 and the actual size scale 5.
It is easy to read from the intersection with 0,52.

As described above, according to the printed circuit board 20 of the present embodiment, the position of the center point of the electronic component is clearly displayed by the position mark M formed on the component mounting surface S thereof. Therefore, the work of measuring the position mark M is
It is possible to accurately and highly accurately know the target center point position without involving an ideological task that assumes the center point of the electronic component. Therefore, the program work for inputting the measured value of the center point position to the mounting machine becomes reliable, and the correction work load such as fine-adjusting the input value again after operating the mounting machine is significantly reduced.

Such an effect is more prominent in the manufacture of the printed circuit board 20 having a large number of mounted components and their types, or in the manufacture of the printed circuit board 20 of high-mix low-volume production. Further, since the printed circuit board 20 of the present embodiment forms the position mark M by using the etching process with high dimensional accuracy, the position mark M is attached at an accurate position with the upper right corner of the substrate as the origin. The above effects are synergistically enhanced.

Further, the printed circuit board 20 of the present embodiment has a discarding plate 2 of the printed circuit board 20 during the same etching process.
4, 26, actual scale 50 with the upper right corner of the substrate as the origin
52 is formed. This makes it possible to use the actual scales 50 and 52 for measuring the position mark M, and it is not necessary to prepare a separate scale for measuring the position. Further, since the actual scales 50, 52 are formed on the discarding plates 24, 26, if the discarding plates 24, 26 are discarded when the printed circuit board 20 is completed, the external appearance of the printed circuit board 20 is determined by the actual scales 50, 52. There is no loss.

In the present embodiment, an example in which a small dot-shaped mark (mark) is used as the position mark M has been described, but the form is arbitrary as long as it has a function of displaying an arbitrary point, and a double-digit type. , The shape of a cross, the shape of a US mark, etc., or the position marks M of these forms may be selectively used according to the type of electronic component. By using the position mark M corresponding to the type of the electronic component, it is possible to prevent an input error in the type of the electronic component to be mounted as well as the mounting position of the electronic component during the programming work of the mounting machine.

The embodiment of the present invention has been described above.
The present invention is in no way limited to such embodiments, and it goes without saying that the present invention can be embodied in various modes without departing from the gist thereof. For example, the formation of the position mark M is not limited to the etching process, and a silk printing process may be used. Also, the actual scale 50, 52
Similarly, printing may be performed using a silk printing process, or all the waste plates 24 to 30 may be formed.

Depending on the substrate, it may not be possible to form the position mark as a pattern by an etching process, and formation of the position mark by silk printing is also useful. Although accuracy is usually lower when silk-printing position marks than when they are formed by an etching process, the mounting position of parts is relative, so you must enter the position data of each position mark once. For example, the error correction by silk printing is not so difficult. When working without the position mark indicating the center point, the error in the measured value of the position of each position mark has its own variation, whereas the error due to the error in silk printing does not occur. , Because there is an error common to all position marks.

The actual scales 50 and 52 may be provided on the side of the mounting position measuring jig 60 which is a jig.
In this case, it is not necessary to provide a scale on the printed circuit board 20 side, and there is a great advantage particularly when there is no waste plate. If the reference hole 42 is used, it is easy to accurately specify the positional relationship between the mounting position measuring jig 60 and the printed circuit board 20.

[0026]

As described above, in the printed circuit board of the present invention, the position of the center point of the electronic component is clearly displayed by the position mark formed on the component mounting surface, so that the printed circuit board can be used accurately and with high precision. It is possible to measure the center point position. Therefore, the program work for inputting the measured value of the center point position to the mounting machine becomes easy and reliable, and the correction work load such as fine-adjusting the input value again after the mounting machine is operated is significantly reduced.

By using the etching process for forming the position mark, the positional relationship with the electric circuit pattern can be defined with high precision at the same time as the electric circuit pattern. Further, if a scale having a predetermined position such as a reference hole on the printed circuit board as an origin is formed on the peripheral edge of the printed circuit board, this scale can be used for measuring the position mark. Further, when the scale is formed on the discarding plate portion, the discarding plate portion on which the scale is formed can be discarded at the time of completion of the printed circuit board, which is also preferable in appearance.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a component mounting surface S of a printed circuit board 20 that is an embodiment of the present invention.

FIG. 2 is an explanatory view of a usage state of a mounting position measuring jig 60 which measures a position mark M formed on the printed board 20.

[Explanation of symbols]

 20 ... Printed circuit board 22 ... Breaking part 24-30 ... Discard plate 42 ... Reference hole 50, 52 ... Actual scale 60 ... Mounting position measuring jig 62 ... Insertion groove 64, 66 ... Side wall 70, 72 ... Insertion pin 74, 76 ... Main body slide groove 82, 84 ... Ruler slide groove 86 ... L ruler 88 ... Measuring needle L ... Land M ... Position mark M1-M5 ... Position mark S ... Component mounting surface

Claims (4)

[Claims] 1. A printed circuit board in which a predetermined electric circuit pattern is formed by an etching process, and an electronic component according to the electric circuit pattern is automatically mounted by a mounting machine to perform a desired function, wherein the electronic component is mounted. On the component mounting surface to be formed, a predetermined position mark is formed at a position where a center point of the electronic component is located when the electronic component is mounted. 2. The printed circuit board according to claim 1, wherein the position mark is formed by using an etching process. 3. The printed board according to claim 1, wherein a scale having a predetermined position on the printed board as an origin is formed on a peripheral edge. 4. The printed circuit board according to claim 3, wherein a scale is formed on a waste plate portion of the printed circuit board.