JPH1041000A - Lightning proof structure of transmission controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a lightning proof structure of a transmission controller capable of improving lightning proof property and being small-sized with a simple structure by improving a structure of a terminal portion and a case portion and the like for housing the terminal portion. SOLUTION: In a lightning proof structure of a transmission controller to be connected between a telephone line and a terminal device, following means is used. The structure comprises a printed wiring board 10 mounting electronic circuit parts constituting a transmission control function, a telephone line connection portion 2 in which base body is made of an insulation material and a telephone line is wired and connected, a terminal portion 1 at which a recess portion 4 is formed for the base body between terminal device wiring portions 3 and both wiring portions 2 and 3 are connected to the printed wiring board 10, an insulation material based case portion 11 for housing the printed wiring board 10 and the terminal portion 1, and an insulation material based cover 8 removably mounted on the case portion 11, protecting the terminal portion 1, a protrusion portion 9 engaged with a recess portion 4 being formed during mounting. With this constitution, a face distance 13 along both wiring portions 2 and 3 becomes long and lightning proof property is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission control device for transmitting data by connecting to a telephone line, for example, an automatic meter reading system using a telephone line. The present invention relates to a lightning-resistant structure of a transmission control device to which a meter or the like for measuring the light transmission is connected.

[0002]

2. Description of the Related Art First, a lightning-resistant structure of an automatic meter reading system using a telephone line will be described with reference to FIG.
An automatic meter reading system using a telephone line is a gas meter 3
1. A terminal device including a water meter 32 and the like is connected to a transmission control device 33, and is connected from the transmission control device 33 to a center device (not shown) via a telephone line. In such an automatic meter reading system, when a lightning strike occurs, a considerable voltage is generated between the telephone line 34 and the ground. On the other hand, the gas meter 31 or the water meter 3 connected to the transmission control device 33
2 is made of metal, and the pipes to the meters 31 and 32 are also made of metal.
1 and 32 have substantially the same potential as the ground, and it is also difficult to electrically insulate the electronic circuit parts incorporated in the meters 31 and 32 from the metal housing. The electronic circuit on the side has to be almost at the same potential. Therefore, telephone line 3
4 and the ground are often provided by the transmission control device 33, and an optical coupling element such as a photocoupler 3 serves as a communication interface between the terminal device and the transmission control device 33.
5, and a photodiode and a phototransistor are used to electrically insulate the terminal device from lightning.

As described above, when communication is performed between a terminal device and a transmission control device using an optical coupling element and electrical insulation between a telephone line and the ground is performed, the electrical insulation (lightning resistance performance) is as follows. It depends on the lightning resistance between the optical couplings of the optical coupling elements or the lightning resistance due to the creepage distance between the conductors of the circuit electrically insulated in the transmission control device. In recent years, lightning resistance between optical couplings of optical coupling elements has been improved and transmission control devices have been downsized.
The lightning resistance of the transmission control device has been particularly dependent on the creepage distance between conductors on the telephone line side and the terminal device side in the transmission control device. The minimum creepage distance between the conductor on the telephone line side and the conductor on the terminal device side in the transmission control device is the distance between the telephone line connection portion of the terminal portion made of an insulating material and the terminal device connection portion or the portion connecting the terminal portion and the printed circuit board portion. Often it is either the telephone line side or the terminal side.

Next, an example of a lightning-resistant structure of a conventional transmission control device will be described with reference to FIGS. FIG. 13 illustrates a housing configuration of the transmission control device. A printed circuit board 10 on which electronic circuit components constituting a transmission control function are mounted,
The telephone line 34 and the conducting wire 37 from the terminal device are connected and connected, and the connection portion is connected to the terminal portion 36 connected to the printed circuit board 10, the case portion 11 in which the printed circuit board 10 and the terminal portion 36 are fitted, and the case portion 11. It is constituted by a cover part 38 which is attached and detached and protects the connection part of the terminal part 36. The cover section 38 is fixed to the case section 11 by screws 12. 14 shows the configuration of the terminal section 36, FIG. 15 shows the configuration of the case section 11, FIG. 16 shows the configuration of the cover section 38, and FIG. 17 shows the configuration in which the terminal section 36 and the printed circuit board 10 are connected. ing. Terminal 36
The base is made of an insulating material, and the connection connection part is made up of a metal screw 5, a mounting bracket 6, and a terminal 7, and the terminal 7 is connected to a conductor of the printed circuit board 10 by soldering 39. In the lightning-resistant structure of the conventional transmission control device, as shown in FIG. 17, the creepage distance a between the telephone line connection portion 2 and the terminal device connection portion 3 of the terminal portion 36 and the terminal 7 of the terminal portion 36 and the printed circuit board 10 2a and terminal device 3 of the terminal connection portion connecting the conductor portions of
The structure in which the creepage distance c between “a” is separated ensures lightning resistance.

[0005]

The transmission control device used in such a system is installed on the wall of a house in a general household or mounted on the gas meter body.
Due to aesthetic problems and restrictions on installation locations, further miniaturization and improvement in lightning resistance are required. However,
With conventional transmission control equipment, it is difficult to secure lightning resistance without securing a straight creepage distance between the telephone line side and terminal equipment side, and it is difficult to expect further miniaturization and improvement in lightning resistance. There was a problem.

[0006] The present invention has been made in view of the above,
It is an object of the present invention to provide a lightning-resistant structure of a transmission control device which has improved lightning resistance and can be downsized with an easy structure.

[0007]

According to one aspect of the present invention, there is provided a lightning-resistant structure of a transmission control device connected between a telephone line and a terminal device. A printed circuit board on which an electronic circuit component constituting a function is mounted, and a base unit made of an insulating material, between a telephone line connection unit to which the telephone line is connected and a terminal device connection unit to which the terminal device is connected. A terminal portion in which a concave portion is formed in the base body and the two connection portions are connected to the printed circuit board;
A case portion made of an insulating material for accommodating the printed circuit board and the terminal portion, and a cover portion made of an insulating material formed with a convex portion which is attached to and detached from the case portion to protect the terminal portion and to be sandwiched by the concave portion when mounted. The gist is to have With this configuration, the creeping distance between the telephone line connection portion and the terminal device connection portion in the terminal portion is increased by going around the convex portion of the cover portion.

According to a second aspect of the present invention, in the lightning proof structure of the transmission control device according to the first aspect, a slit is provided between the telephone line side and the terminal device side at a terminal connection portion of the printed circuit board. The gist of the present invention is that the terminal portion is formed with a convex portion sandwiched between the slits. With this configuration, in addition to the effect of the first aspect of the invention, the creeping distance between the telephone line side and the terminal device side at the terminal portion connection portion of the printed circuit board is further increased by going around the convex portion of the terminal portion.

According to a third aspect of the present invention, in the lightning-resistant structure of the transmission control device according to the first aspect, a slit is provided between the telephone line side and the terminal device side at a terminal portion connection portion of the printed circuit board. The gist of the present invention is that the case portion is formed with a convex portion sandwiched between the slits. With this configuration, in addition to the effect of the first aspect of the invention, the creeping distance between the telephone line side and the terminal device side in the terminal portion connection portion of the printed board is further increased by going around the convex portion of the case portion.

According to a fourth aspect of the present invention, in the lightning proof structure of the transmission control device according to the second aspect, the case portion has a concave portion for sandwiching the convex portion formed on the terminal portion. Is the gist. According to this configuration, the creepage distance between the telephone line side and the terminal device side at the terminal portion connection portion of the printed circuit board can be reduced by sandwiching the concave portion of the case portion between the protrusion portions of the terminal portion. Even longer.

According to a fifth aspect of the present invention, in the lightning-resistant structure of the transmission control device according to the third aspect, the terminal portion includes:
The gist of the present invention is to form a concave portion that sandwiches the convex portion formed in the case portion. According to this configuration, the creepage distance between the telephone line side and the terminal device side in the terminal portion connection portion of the printed circuit board is reduced by sandwiching the concave portion of the terminal portion between the convex portion of the case portion. Even longer.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 to FIG. 3 are views showing a first embodiment of the present invention. In FIGS. 1 to 3 and the drawings showing the respective embodiments to be described later, the same or equivalent parts as those in FIGS. 13 to 17 are denoted by the same reference numerals. In the present embodiment, as shown in FIG. 2, a concave portion 4 is provided between a telephone line connection portion 2 and a terminal device connection portion 3 in a terminal portion 1 whose base is made of an insulating material.
Are formed. The telephone line connection portion 2 and the terminal device connection portion 3 are composed of screws 5 and mounting brackets 6 in the same manner as the conventional terminal portion.
And a terminal 7, and can be connected by screwing. On the other hand, as shown in FIG. 3, the cover portion 8 made of an insulating material has a convex portion 9 sandwiched between the concave portions 4 when the cover portion 8 is attached to the case portion 11. FIG.
The figure shows a state in which the printed circuit board 10 and the terminal unit 1 are housed in the case unit 11 in a connected state, and the cover unit 8 is mounted on the case unit 11 and fixed by the screws 12.
In this way, with the cover 8 attached to the case 11, the convex portion 9 of the cover 8 is sandwiched between the concave portions 4 of the terminal 1. Therefore, the creepage distance 13 between the telephone line connection 2 and the terminal device connection 3 in the terminal 1 is
As shown in FIG. 1 (d), which is an enlarged view of the portion A in FIG. 1 (a), the shape goes around the convex portion 9 of the cover 8. Therefore, the creepage distance 13 between the telephone line connection unit 2 and the terminal device connection unit 3 is the same as that of the conventional telephone line connection unit 2 and the terminal device connection unit 3.
It is longer than the creepage distance a by an amount (2 × b) that goes around the convex portion 9 of the cover portion 8.

As described above, according to the present embodiment,
Creepage distance 13 between telephone line connection 2 and terminal device connection 3
And the lightning resistance of the terminal connection connection portion can be improved. Also, even if the distance between the telephone line connection part 2 and the terminal device connection part 3 is reduced by the amount (2 × b) that goes around the convex part 9 of the cover part 8, the conventional telephone line connection part and terminal device connection part Creepage distance between them,
It is possible to reduce the size without deteriorating the lightning resistance of the terminal connection connection portion.

FIGS. 4 and 5 show a second embodiment of the present invention. FIG. 4B is a view as viewed from A in FIG.
FIG. 3C is an enlarged view of a portion B in FIG. In the present embodiment, as shown in FIG. 4, a slit 17 is formed in the printed circuit board 16 between the telephone line side 2a and the terminal device side 3a of the terminal portion connection portion. On the other hand, as shown in FIG. 5, in addition to the structure of the terminal portion shown in FIG. 2, the terminal portion 14 is further formed with a convex portion 15 made of an insulating material sandwiched between the slits 17 of the printed board 16. . As shown in FIG. 4, when the terminal portion 14 and the printed board 16 are connected by soldering and assembled, the telephone line side 2a and the terminal device side 3 in the terminal portion connection portion of the printed board 16 are connected.
4A, the creepage distance 18 between the telephone line side 2a and the terminal device side 3a is reduced, as shown in FIG. 4D. 14 is formed around the convex portion 15. Therefore, the creepage distance between the telephone line side 2a and the terminal device side 3a is 1
8 is [√ (d ² + g ² ) + e + √ (f ² + g ² )], which is [(√ (d ² + g ² ) −) with respect to the conventional creepage distance c between the telephone line side and the terminal device side. d) + (√ (f ² + g
² ) -f)]. The configuration of the other parts such as the cover is the same as that of the first embodiment.

As described above, according to the present embodiment,
In addition to the effects of the first embodiment, the creeping distance 18 between the telephone line side 2a and the terminal device side 3a in the terminal connection portion of the printed circuit board 16 is further increased, and the lightning resistance can be further improved.

FIGS. 6 and 7 show a third embodiment of the present invention. In the present embodiment, the printed circuit board 16
The same configuration as that of the second embodiment is used, and the telephone line side 2a and the terminal device side 3a of the terminal connection portion are used.
A slit is formed between them. Then, as shown in FIG. 7, a convex portion 20 made of an insulating material sandwiched between the slits of the printed board 16 is formed on the bottom surface of the case portion 19. As shown in FIG.
When the terminal portion 1 and the terminal portion 1 are connected to each other and assembled into the case portion 19, the slit between the telephone line side 2a and the terminal device side 3a in the terminal portion connection portion of the printed circuit board 16 has a convex portion of the case portion 19 made of an insulating material. Because 20 is sandwiched,
The creepage distance 21 between the telephone line side 2a and the terminal device side 3a is:
The shape turns around the convex portion 20 of the case portion 19. For this reason, the creepage distance 21 between the telephone line side 2a and the terminal device side 3a
Is longer than the conventional creepage distance c between the telephone line side and the terminal device side. The other components such as the terminal 1 and the cover are the same as those in the first embodiment.

As described above, according to the present embodiment,
In addition to the effects of the first embodiment, the creeping distance 21 between the telephone line side 2a and the terminal device side 3a at the terminal connection portion of the printed circuit board 16 is further increased, and the lightning resistance can be further improved.

FIGS. 8 and 9 show a fourth embodiment of the present invention. This embodiment corresponds to a modification of the second embodiment, in which the structure of the case portion is modified. As shown in FIG. 9, concave portions 23a and 23b made of an insulating material sandwiching the convex portion 15 of the terminal portion 14 shown in FIG. 5 are formed on the bottom surface of the case portion 22.
As shown in FIG. 8, when the printed circuit board 16 and the terminal section 14 are connected to each other and assembled into the case section 22, the slit between the telephone line side 2a and the terminal apparatus side 3a in the terminal section connection portion of the printed circuit board 16 is formed. Terminal part 14 sandwiched
Of the case portion 22 further has a concave portion 23a,
23b. Therefore, the creepage distance 24 between the telephone line side 2a and the terminal device side 3a is (d + 2 ×
g + e + f = c + 2 × g), which is (2 × g) longer than the conventional creepage distance c between the telephone line side and the terminal device side, and further longer than the creepage distance in the second embodiment. . The terminal portion 14 and the printed circuit board 16
The configuration of other parts such as the unit is the same as that of the second embodiment.

As described above, according to the present embodiment,
In addition to the effects of the first embodiment, the creeping distance 24 between the telephone line side 2a and the terminal device side 3a at the terminal connecting portion of the printed circuit board 16 is further increased, and the lightning resistance can be further improved.

FIGS. 10 and 11 show a fifth embodiment of the present invention. This embodiment corresponds to a modification of the third embodiment, and is a modification of the structure of the terminal portion. As shown in FIG. 10, the terminal portion 25 has a concave portion 26 made of an insulating material sandwiching the convex portion 20 of the case portion 19 shown in FIG. As shown in FIG. 10, when the printed circuit board 16 and the terminal portion 25 are connected to each other and incorporated into the case portion 19, the terminal is connected between the telephone line side 2a and the terminal device side 3a in the terminal portion connection portion of the printed circuit board 16. The concave portion 26 of the portion 25 and the convex portion 20 of the case portion 19 are sandwiched. Therefore, the telephone line side 2
c and the creepage distance 27 between the terminal device side 3a is [√ (d ² +
g ² ) + e + 2h + √ (f ² + g ² )], and the creepage distance c between the conventional telephone line side and the terminal device side is
[(√ (d ² + g ² ) −d) + (√ (f ² + g ² ) −
f) + 2h]. The configuration of the other parts such as the case 19 is the same as that of the third embodiment.

As described above, according to the present embodiment,
In addition to the effects of the first embodiment, the creeping distance 27 between the telephone line side 2a and the terminal device side 3a in the terminal portion connection portion of the printed circuit board 16 is further increased, and the lightning resistance can be further improved.

In each of the above embodiments, the connection of the telephone line and the terminal device by the screw connection has been described. However, the present invention is not limited to the connection method. Further, although the connection method between the terminal portion and the printed board is direct connection by soldering or the like, the present invention is not limited to the connection method between the terminal portion and the printed board, and may be a connection method such as connector connection. Further, the present invention is not limited to a method of fixing the terminal and the case, and a method of attaching the cover.

[0024]

As described above, according to the first aspect of the present invention, the printed circuit board on which the electronic circuit component constituting the transmission control function is mounted, the base is made of an insulating material, and the telephone line is connected. A terminal portion in which a concave portion is formed in the base between the telephone line connection portion and the terminal device connection portion to which the terminal device is connected and connected, and both connection portions are connected to the printed circuit board; and the printed circuit board and the terminal. A case portion made of an insulating material for housing the portion, and a cover portion made of an insulating material formed with a convex portion that is attached to and detached from the case portion to protect the terminal portion and to be sandwiched by the concave portion at the time of mounting, The creeping distance between the telephone line connection portion and the terminal device connection portion in the terminal portion is increased, and the lightning resistance of the terminal portion connection connection portion can be improved. Also, even if the distance between the telephone line connection part and the terminal device connection part is reduced, the creepage distance between the conventional telephone line connection part and the terminal device connection part can be secured, so that the lightning resistance of the terminal part connection connection part can be secured. Can be reduced without deteriorating the size.

According to the second aspect of the present invention, a slit is formed between the telephone line side and the terminal device side at a terminal portion connection portion of the printed circuit board, and the terminal portion is sandwiched between the slits. Since the protruding portion is formed, the creepage distance between the telephone line side and the terminal device side in the terminal connection portion of the printed circuit board is also increased, so that the lightning resistance can be further improved, and the lightning resistance can be further improved without deteriorating. Can be reduced in size.

According to the third aspect of the present invention, a slit is formed between the telephone line side and the terminal device side in the terminal portion connection portion of the printed circuit board, and the case portion is sandwiched between the slits. Because a convex part was formed,
Almost the same effects as the effects of the invention described in claim 2 can be obtained.

According to the fourth aspect of the present invention, since the case portion has a concave portion for sandwiching the convex portion formed on the terminal portion, the telephone line side and the terminal device side in the terminal portion connecting portion of the printed circuit board. Since the creepage distance between them is longer than the creepage distance in the invention of claim 2,
Lightning resistance can be further improved, and further downsizing can be achieved without deteriorating lightning resistance.

According to the fifth aspect of the present invention, since the terminal portion is formed with a concave portion for sandwiching the convex portion formed in the case portion, the telephone line side and the terminal device side in the terminal portion connecting portion of the printed circuit board. Since the creepage distance between them is even longer than the creepage distance in the invention of claim 3,
Almost the same effects as the effects of the invention described in claim 4 can be obtained.

[Brief description of the drawings]

FIG. 1 shows a first example of a lightning-resistant structure of a transmission control device according to the present invention.
FIG. 2 is a configuration diagram showing an embodiment.

FIG. 2 is a diagram showing a configuration of a terminal unit in the first embodiment.

FIG. 3 is a diagram illustrating a configuration of a cover unit according to the first embodiment.

FIG. 4 is a diagram showing an assembled state of a terminal unit and a printed circuit board unit according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a terminal unit in the second embodiment.

FIG. 6 is a front view showing a state where a terminal section and a printed circuit board are incorporated in a case section in a third embodiment of the present invention.

FIG. 7 is a diagram showing a configuration of a case section according to the third embodiment.

FIG. 8 is a front view showing a state where a terminal section and a printed circuit board are incorporated in a case section in a fourth embodiment of the present invention.

FIG. 9 is a diagram illustrating a configuration of a case section according to the fourth embodiment.

FIG. 10 is a front view showing a state where a terminal section and a printed circuit board are incorporated in a case section in a fifth embodiment of the present invention.

FIG. 11 is a diagram showing a configuration of a terminal unit in the fifth embodiment.

FIG. 12 is a diagram showing a lightning-resistant structure of a conventional automatic meter reading system using a telephone line.

FIG. 13 is a diagram illustrating a housing configuration of a conventional transmission control device.

FIG. 14 is a diagram showing a configuration of a terminal unit of a conventional transmission control device.

FIG. 15 is a diagram illustrating a configuration of a case unit of a conventional transmission control device.

FIG. 16 is a diagram illustrating a configuration of a cover unit of a conventional transmission control device.

FIG. 17 is a diagram showing a lightning-resistant structure of a terminal portion and a printed circuit board portion in a conventional transmission control device.

[Explanation of symbols]

 1,14,25 Terminal 2 Telephone line connection 2a Telephone line side of terminal connection 3 Terminal device connection 3a Terminal side of terminal connection 4,32a, 23b, 26 Concave portion 8 Cover 9,15 , 20 Convex part 10, 16 Printed circuit board 11, 19, 22 Case part 13, 18, 21, 24, 27 Creepage distance 17 Slit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshihiko Kawai 70, Yanagimachi, Saiwai-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Toshiba Yanagimachi Plant Co., Ltd. Inside

Claims (5)

[Claims] 1. A lightning-resistant structure of a transmission control device connected between a telephone line and a terminal device, wherein a printed circuit board on which electronic circuit components constituting a transmission control function are mounted, and a base made of an insulating material. A terminal in which a concave portion is formed in the base between a telephone line connection portion where the telephone line is connected and a terminal device connection portion where the terminal device is connected and connected, and the two connection portions are connected to the printed circuit board. Part, a case part made of an insulating material for accommodating the printed circuit board and the terminal part, and an insulating material formed to have a convex part which is detachably attached to the case part, protects the terminal part and is sandwiched by the concave part at the time of mounting. A lightning-resistant structure of a transmission control device, comprising: 2. A slit is formed between the telephone line side and the terminal device side in a terminal portion connecting portion of the printed circuit board, and the terminal portion has a convex portion sandwiched between the slits. The lightning-resistant structure of the transmission control device according to claim 1, wherein: 3. A slit is formed between the telephone line side and the terminal device side in a terminal portion connecting portion of the printed circuit board, and a convex portion sandwiched by the slit is formed in the case portion. The lightning-resistant structure of the transmission control device according to claim 1, wherein: 4. The lightning-resistant structure of a transmission control device according to claim 2, wherein a concave portion for sandwiching the convex portion formed on the terminal portion is formed in the case portion. 5. The lightning-resistant structure of a transmission control device according to claim 3, wherein said terminal portion has a concave portion for sandwiching a convex portion formed in said case portion.