JPH0513916A - Printed wiring board, printed circuit board and electronic equipment - Google Patents

Abstract

PURPOSE:To make it possible to easily mount the terminal of an electronic part and a device in the part of a printed wiring board. CONSTITUTION:A conductive pattern 2, which is formed by conductive material, and a land 3 are provided on the surface of an insulated substrate 1, and a part hole 9 penetrating the land 3, a guide groove 10 spreading in V-shape and communicating to the above-mentioned part hole, and an aperture part 11 are charactistically provided in the title printed wiring board.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed wiring board, a printed circuit board using the printed wiring board, and an electronic device.

[0002]

2. Description of the Related Art Conventionally, in a printed wiring board used for electronic equipment, as shown in FIG. 12, a conductor pattern 2 is formed of a conductive material on the surface of an insulating substrate 1, and the land 3 penetrates the insulating substrate 1. The structure has the component hole 4. Code 5
Indicates a printed wiring board.

At a predetermined position on the printed wiring board 5,
As shown in FIG. 13, electronic parts 6, electronic devices, etc. are mounted, and lead wires or terminals of those parts are inserted into the part holes 4 and soldered to the lands 3 to connect the printed circuit board 7 to the printed circuit board 7. I was making up.

As described above, the printed circuit board 7 having the printed wiring board 5 and the components mounted thereon has been used in electronic equipment.

[0005]

SUMMARY OF THE INVENTION In the above conventional technique,
When the number of terminals of electronic components and devices mounted on the printed wiring board increases, not only the hole position accuracy of the component holes is required, but also it becomes difficult to insert the terminals of the components into the component holes during component mounting, In particular, when electronic components or devices are mechanically mounted on a frame of an electronic device in advance and then those terminals are inserted into the component holes of the printed wiring board, it becomes more difficult to insert them. was there.

It is an object of the present invention to provide a printed wiring board, a printed circuit board using the printed wiring board and an electronic device which can solve the above problems.

[0007]

In order to achieve the above object, the printed wiring board of the present invention has a conductive pattern (2) and a land (3) formed of a conductive material on the surface of an insulating substrate (1). A component hole (9) penetrating the land (3), a guide groove (10) communicating with the component hole and expanding in a V-shape, and arranged at an enlarged end portion of the guide groove. And an opening (11).

V is connected to each of the plurality of component holes (9).
It is effective that the guide grooves (10) that expand in a letter shape are widened in the same direction from the corresponding component holes (9). Corresponding openings (1) in the printed wiring board (8)
1) electronic parts or devices (13, 14, 15, 1)
6, 17) and other terminals (13a, 14a, 15a, 16)
a, 17a) and then the electronic component or device (13, 14, 15, 16, 17) or the like is moved relative to the printed wiring board (8) to make the terminals (13a, 14a, 1).
It is effective to move (5a, 16a, 17a) to the position of the component hole (9) and solder it to the land (3).

Electronic parts or devices (13, 14, 1)
5, 16, 17) etc. are electronic device frames (25) in advance
Mechanically attached to the terminals (13a, 14)
a, 15a, 16a, 17a) may be connected to the land of the printed wiring board (8) by soldering.

In the printed wiring board (8), the width (W) through which the conductor pattern (2) drawn from the land (3) of the component hole (9) passes is left, and the extraction portion (11) is arranged in three directions. (42) (43) is provided, and a device such as a piezoelectric film sensor (13) having a hermetically sealed terminal (13a) is preliminarily provided with a frame (25) of an electronic gas meter.
It is effective to improve reliability against changes with time by mechanically mounting the terminals and soldering the terminals (13a) to the lands (3) of the printed wiring board (8).

[0011]

[Function] When the electronic parts or devices are mounted on the printed wiring board and their terminals are inserted into the component holes, the terminals are first inserted into the large openings to make the printed wiring board and the electronic parts or devices face each other. By moving, the terminal is guided by the V-shaped guide groove and moves accurately to the position of the component hole,
Easy and correct positioning ensures a soldered connection.

Further, the three-direction extraction portions (11), (42) and (43) provided on the printed wiring board (8) make it easier for the printed wiring board to partially bend, so that the printed wiring board is deformed due to aging or the like. Even if it warps, the acting force applied to the terminals of the piezoelectric film sensor (13) and the like is limited.

[0013]

The embodiments shown in FIGS. 1 to 8 are obtained by applying the present invention to an electronic gas meter as an electronic device.
The amount of gas used is measured by generating fluid vibration with a frequency according to the gas flow rate in the flow path, converting that frequency into an electrical signal, and integrating and counting, but fluid vibration occurs at minute flow rates. Since it is difficult to measure the flow rate, the flow rate range that can be measured is widened by detecting the flow rate with a flow sensor that uses the principle of the so-called hot wire type flow meter, converting it into an electric signal, and integrating and counting.

In addition, it is equipped with a shut-off valve for shutting off gas when gas pressure is abnormal, flow rate is abnormal, or an earthquake occurs. Although it has a communication function, such an electronic gas meter is well known and is also called a fluidic gas meter.

In the embodiment shown in the figure, 8 is a printed wiring board of the present invention, a conductor pattern 2 and a land 3 formed of a conductive material on the surface of an insulating substrate 1, and a component hole 9 penetrating the land 3. It is provided with a guide groove 10 communicating with the component hole 9 and expanding downward in a V shape, and an opening 11 provided at an enlarged end portion of the guide groove 10.

Reference numeral 12 denotes an external terminal for sending a signal for automatic meter reading to the outside, which is provided with four pins 12a electrically connected to the conductor pattern of the printed wiring board 8. 1
Reference numeral 3 denotes a piezoelectric film sensor that detects fluid vibration and converts it into an electric signal, and includes five terminals 13a. These terminals 1
3a project side by side rearward from the case of the piezoelectric film sensor so as to be perpendicular to the plate surface of the printed wiring board 8. Moreover, these terminals 13a are arranged in the same horizontal plane.

Reference numeral 14 denotes a flow sensor for detecting a minute flow rate and converting it into an electric signal. Reference numeral 14a denotes four terminals projecting rearward from the case of the flow sensor 14 and the terminal 13a of the piezoelectric film sensor 13. Similarly, they are arranged in the same horizontal plane at right angles to the board surface of the printed wiring board 8.

Reference numeral 15 is a shutoff valve (solenoid valve), which is provided with two terminals 15a projecting rearward.
Are arranged in the same vertical plane. Reference numeral 16 denotes a pressure switch for detecting an abnormal gas pressure, which includes two terminals 16a protruding rearward from the case, and these terminals 16a are arranged in the same horizontal plane.

Reference numeral 17 denotes an electronic circuit unit, which integrates and counts the flow rate signals from the piezoelectric film sensor 13 and the flow sensor 14 and displays the result on a liquid crystal display 18, an integrating circuit board 19 and the shutoff valve. A control circuit board 20 on which a control circuit for controlling opening / closing of 15 is mounted is integrally fixed to a plastic frame 21.

Although the liquid crystal display 18 is shown in FIG. 1 before being mounted on the integrating board 19, it is actually mounted on the integrating board 19 by soldering. Reference numeral 17a designates six terminals projecting rearward from the electronic circuit unit 17, which are arranged in the same horizontal plane as in the case of the terminals of the respective devices 13, 14, 15 and 16.

22 and 23 are batteries mounted on the control circuit board 20, and 24 is also the control circuit board 20.
An earthquake with a seismic intensity higher than a certain level is detected by the seismoscope mounted in (1) and an electric signal is transmitted to the control circuit 20.

A gas flow passage body 25 is made of aluminum die casting, and has a gas inlet 26 and an outlet 2 at the bottom.
The base as 7 is integrally formed. The piezoelectric film sensor 13 and the flow sensor 14 are the flow path main body 25 of the gas meter.
Mounted on the rear side with screws 28 and 29, respectively.

The shutoff valve 15 is mounted on the right side surface of the flow passage body 25 with a screw 30, and the pressure switch 16 is mounted on the upper portion of the flow passage body 25. The electronic circuit unit 17 is mounted on the upper part of the flow path body 25 with screws 31.

As described above, the flow path main body 25 also serves as a frame for mechanically mounting devices such as the piezoelectric film sensor 13, the flow sensor 14, the shutoff valve 15, the pressure switch 16 and the electronic circuit unit 17. It's done.

As shown in FIG. 1, the printed wiring board 8 is erected vertically and is approached from the rear side of each of the devices and electronic circuits mounted in the flow path main body 25, and each of these devices and electronic circuits is approached. When the printed wiring board 8 is moved downward while the terminals are inserted into the corresponding openings 11 of the printed wiring board 8, each terminal is guided to the corresponding V-shaped groove and fitted into the corresponding component hole 9. To meet.

Since the component hole 9 communicates with the V-shaped guide groove 10, it is not an independent circular hole but the end portion of the V-shaped guide groove 10 having a narrow width. In ゝ, it is expressed by the name of the component hole in accordance with the conventional idiom.

Reference numeral 32 is a guide hole opened almost at the center of the printed wiring board 8. As in the case of the component hole 9, the guide hole 33 is provided with a V-shaped guide groove 33 and an opening 34, and is provided on the flow path main body 25 so as to project. The printed wiring board 8 is positioned by fitting the guide shaft 35 into the guide hole 32 to facilitate the assembly.

Reference numeral 36 is a screw for fixing the printed wiring board 8 to the flow path main body 25, and the guide shaft 35 is fitted into the guide hole 32 of the printed wiring board 8 as described above, and the terminals are connected to the printed wiring board 8. The screw 36 is fitted into the corresponding component hole 9 and penetrates the hole 37 of the printed wiring board 8 to form the female screw 39 of the flow path body.
The printed wiring board 8 is fixed to the mounting surface 40 of the flow path body 25 by screwing the printed wiring board 8 onto the mounting surface 40.

After that, each terminal is soldered and connected to the corresponding land 3 of the printed wiring board 8. FIG. 7 shows the terminal 1 of the flow sensor 14 in the opening 11 of the printed wiring board 8.
4a is first inserted, and then the printed wiring board 8 is moved downward as shown by arrow A to insert the terminal 1 into the component hole 9.
4A to 4C illustrate an assembling process of fitting 4a.

9'denotes a component hole into which the terminal is fitted, but since it has no land, a dash is attached to distinguish it from the component hole 9. The same applies to the V-shaped guide groove 10 '.

FIG. 8 shows an electronic gas meter completed by assembling the terminals corresponding to the lands of the printed wiring board 8 by soldering, and the two-dot chain line 41 indicates the gas meter case.

By the way, among the above electronic parts or devices, the piezoelectric film sensor 13 and the flow sensor 14 are hermetically sealed to the terminals 13a and 14a for the purpose of gas sealing.

In the electronic gas meter which has been assembled by soldering and connecting as shown in FIG. 8, the printed wiring board 8 warps due to a change with time due to temperature and humidity stress, and the compression and extraction force is applied to the terminals 13a and the like. Acts as.

The reason why the printed wiring board 8 warps in this way is that
For example, when the insulating substrate of the printed wiring board 8 expands due to moisture absorption, the printed wiring board is bent in a bimetal shape and warps because the copper foil is single-sided in the single-sided board.

The compression and extraction forces acting on the terminals 13a and the like due to the warp of the printed wiring board lead to the destruction of the hermetic portion of the terminals, which is a fatal obstacle for the electronic gas meter.

The second embodiment shown in FIG. 9 uses a shape of a printed wiring board that is free from the risk of destruction of the hermetic portion. In this embodiment, the portion where the terminal 13a of the printed wiring board 8 is soldered is the pole portion so that the compression or drawing force due to the warp of the printed wiring board 8 does not act on the hermetic portion of the terminal 13A of the piezoelectric film sensor 13. It is formed like a free end of a beam fixed at one end so that it can easily move in the thickness direction.

That is, the width (about 10 mm) through which the conductor pattern 2 drawn from the land 3 for soldering the terminal 13a to the printed wiring board passes is left, and extraction portions are provided in three directions. The opening 11 also serves as one of these three-direction extraction portions, and the other two extraction portions are denoted by reference numerals 42 and 43.

By providing the three-direction extraction portions, the force applied to the terminals of the piezoelectric film sensor can be limited to the extent that the hermetically sealed portion is not destroyed even if the printed wiring board warps due to aging. .

FIG. 10 shows experimental values of the force acting on the terminal when the shape and size of the extracted portion of the printed wiring board are changed. The data of FIG. 10 shows that, as shown in FIG. 11, three component holes 9 are provided, a width W [mm] through which a total of three conductor patterns 2 drawn from the lands 3 of these component holes pass, and terminals are attached. The length L [mm] from the component hole 9 to the bent part is changed, and it is applied to the terminal when the deflection in the thickness direction (of the beam of length L) at the position of the component hole 9 is 0.5 mm. The load (that is, the load at the position of the partial hole 9) is shown, and the insulating substrate 1
Has a thickness of 1 mm.

As is apparent from FIG. 10, the width W through which the conductor pattern 2 passes is set to about 10 mm, and the extraction portions are provided in three directions. Displacement of 0.5 mm (deflection) if the length L from the position to the bend is about 20 mm
On the other hand, the force could be 300 gr or less, and the force could be limited to the extent that the destruction of the hermetic seal could be prevented.

[0041]

Since the printed wiring board of the present invention is constructed as described above, the processing precision of the pitch of the terminals of the device to be mounted and the pitch of the component holes of the printed wiring board itself is the same as in the prior art. Since the mounting work can be easily performed without high precision, the processing accuracy of the pitch of the terminals and the component holes is rough, and the assembly is easy.

In particular, when parts such as devices are previously attached to the frame of an electronic device and then a printed wiring board is connected by soldering to those terminals, it is difficult to obtain the terminal position accuracy when the number of devices is large, Even in such a case, it is more effective because the assembly is easy.

Further, since there is no possibility that the acting force due to the warp of the printed wiring board due to aging or the like will destroy the hermetically sealed portion of the device, it contributes to the improvement of the reliability of the electronic gas meter, especially the fluidic gas meter.

[Brief description of drawings]

FIG. 1 is a partially exploded perspective view of an embodiment of the present invention as seen obliquely from the rear.

FIG. 2A is a rear view and FIG. 2B is a right side view of a piezoelectric film sensor.

FIG. 3A is a rear view of the flow sensor, and FIG. 3B is a right side view thereof.

FIG. 4 is a top view of the shutoff valve.

FIG. 5 is a left side view of the pressure switch.

6 is an enlarged right side view of the terminals of the pressure switch of FIG.

FIG. 7 is a partially enlarged rear view illustrating a step of inserting and fitting a flow sensor terminal into a printed wiring board according to the present invention.

FIG. 8 is a perspective view showing the assembled state of the embodiment of FIG. 1 when viewed obliquely from the rear.

FIG. 9 is a partially exploded perspective view of a second embodiment of the present invention seen obliquely from the rear.

FIG. 10 is a diagram illustrating a flexural load of a printed wiring board used in the second embodiment of the present invention.

11 is a partial enlarged rear view of the printed wiring board for obtaining the data of the diagram of FIG.

FIG. 12 is a perspective view showing a part of a conventional printed wiring board.

FIG. 13 is a perspective view showing a part of a conventional printed circuit board.

[Explanation of symbols]

1 Insulation board 2 conductor pattern 3 land 8 printed wiring board 9 parts holes 10 V-shaped groove 11 Opening part (withdrawal part) 13 Piezoelectric film sensor 14 Flow sensor 15 Shut-off valve 16 Pressure switch 17 Electronic circuit unit 13a, 14a, 15a, 16a, 17a terminals 25 frame (flow path body) 42, 43 Extraction part W width

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshihiko Ito             1-270 Chitose 1-chome, Atsuta-ku, Nagoya-shi, Aichi               Inside Aichi Clock Electric Co., Ltd. (72) Inventor Hirokazu Kanda             1-270 Chitose 1-chome, Atsuta-ku, Nagoya-shi, Aichi               Inside Aichi Clock Electric Co., Ltd.

Claims (6)

[Claims] 1. An insulating substrate (1) having a conductor pattern (2) formed of a conductive material and a land (3) on a surface thereof, wherein a component hole (9) penetrating the land (3).
And a guide groove (1
0) and an opening (11) provided at the enlarged end of the guide groove. 2. A guide groove (10), which communicates with each of the plurality of component holes (9) and extends in a V shape, is widened in the same direction from the corresponding component hole (9). The printed wiring board according to claim 1. 3. Electronic components or devices (13, 14, 1)
5, 16 and 17) and other terminals (13a, 14a, 15a,
16a, 17a) is inserted through the corresponding opening (11) of the printed wiring board (8) according to claim 1 or 2, and then an electronic component or device (13, 14, 15, 16, 17)
And the like are moved relative to the printed wiring board (8) to move the terminals (13a, 14a, 15a, 16a, 17a) to the positions of the component holes (9) and soldered to the land (3). And printed circuit board. 4. Electronic parts or devices (13, 14, 1)
5, 16, 17) etc. are electronic device frames (25) in advance
Mechanically attached to the terminals (13a, 14)
a, 15a, 16a, 17a) is soldered and connected to the land (3) of the printed wiring board (8) according to claim 1 or 2. 5. A width (W) of a conductor pattern (2) drawn out from a land (3) of a component hole (9) is left to be 3
The printed wiring board (8) according to claim 1, wherein the extraction portions (11) (42) (43) are provided in the direction, and terminals (13a) are used.
Piezoelectric membrane sensor (1 with hermetically sealed
A device such as 3) is mechanically brought into close contact with the frame (25) of the electronic gas meter in advance, and those terminals (13a) are soldered and connected to the land (3) of the printed wiring board (8). Electronic equipment to do. 6. The electronic apparatus according to claim 5, wherein the electronic gas meter is a fluidic gas meter which measures fluid flow by detecting a fluid vibration with a piezoelectric film sensor (13).