JPS6334435Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Technical field The present invention relates to a communication security device for protecting communication equipment from abnormal surges, etc. It relates to something that can be assembled and mounted on a printed circuit board.

(2) Prior art and problems As this type of communication security device, in a balanced communication circuit as shown in _{FIG .}
A three-pole button-type gas lightning arrester A with an intermediate electrode connected to ground is inserted in parallel to the line, and a plurality of thermistors R ₁ , as thermal resistance elements are placed on the inner line side I ₁ , I ₂ . R ₂ are each inserted in series. This communication line L ₁ , I ₁ and L ₂ , I ₂
A low communication voltage is used in the data line, and poor contact has a negative effect on the communication voltage, and may even cause code conversion in the data line. For this reason, highly reliable soldering has been implemented on communication lines L ₁ , I ₁ and L ₂ , I ₂ , but even if a slight contact failure occurs on the ground side that is connected in parallel, overvoltage can be reliably prevented. Since it is grounded, mechanical connection structures such as connectors are often used. For the above reasons, button type gas lightning arrester A and thermistor
Since R ₁ and R ₂ were individually installed on the communication security device, not only did they require a large installation space, but the installation process took time. In particular, it is not only troublesome to solder the lead wires of the thermistors R ₁ and R ₂ to the terminals, but also the solder part must be held still for several seconds after the solder melts until it solidifies. This often led to a decrease in work efficiency and made it impossible to implement the process automatically. These drawbacks were even more noticeable when installed in collective lines.

In view of the above-mentioned circumstances, we focused on developing a unit in which each element was pre-installed, but the following problems remained. That is, with the recent aggregation of communication lines, the units mounted on the printed circuit board must be structured so that they can be arranged in large numbers on the printed circuit board. Moreover, in this case, since the shapes and electrode arrangement of the gas-entering lightning arrester A and the two thermal reaction elements R ₁ and R ₂ have been determined, these should be arranged so as to match the insertion hole spacing of the printed circuit board. There must be.

In addition, it is necessary to make it easy to assemble each element into the unit. To this end, it is desirable to connect each terminal without requiring soldering work, so a method is adopted in which each terminal is independently molded and connected using a printed circuit board. According to this method, the ground side of the three-pole gas lightning arrester A is sandwiched between both communication lines L ₁ , I ₁ and L ₂ , I ₂ on the printed circuit board, so the ground side wiring has a jumper wire. A new need has arisen to use such methods.

(3) Purpose of the invention The present invention was provided in order to solve the above-mentioned problems. The purpose is to allow a large number of them to be mounted side by side on a printed circuit board.

(4) Structure of the invention The structure of the invention consists of a printed insulating substrate that incorporates a three-pole button-shaped gas lightning arrester element and two thermal resistance elements without lead wires on the sides in a substantially parallel arrangement. It is formed so that it can be mounted in parallel on the board, and there are 3
A connection terminal is provided to connect to the electrode of the button-type gas-entered lightning arrester element of the pole, and two pairs of contact terminals are provided for sandwiching each electrode with a fusible conductor interposed between each electrode of the two thermal resistance elements, Of the two pairs of contact terminals, one of the contact terminals arranged in parallel and located on both outer sides is arranged close to the three-pole button-type gas lightning arrester.

(5) Example of the invention The present invention will be explained below based on an example from FIG. 2 onwards.

Figure 2 of the drawings is a partially cutaway perspective view of the communication security device according to the present invention, Figure 3A is a sectional view taken along the - line in Figure 2, Figure B is a left side view, and Figure 4 is a plane view of the same plane. figure,
Fig. 5 is a bottom view of the same, Fig. 6 is a sectional view taken along the - line in Fig. 4, Fig. 7 is an explanatory diagram showing the insertion and connection state of the thermal resistance element, and Fig. 8 is a printed version. FIG. 3 is a schematic diagram showing a state of attachment to a board.

In the figure, 1 is an insulating base made of synthetic resin with good insulation and molded into a rectangular shape. It incorporates a button-type gas-entry lightning arrester (hereinafter simply referred to as lightning arrester) A and two thermistors R ₁ and R ₂ as disc-shaped heat resistance elements with electrode surfaces exposed without lead wires. Configure the unit. The insulating base 1 has external dimensions that allow it to be mounted in parallel on the printed circuit board P in large numbers, and lightning arrester elements A are arranged in the width direction of the base in order to match the insertion hole spacing of the printed circuit board P and each terminal. On the other hand, the thermistors R ₁ and R ₂ are installed in a diagonally parallel arrangement in the lateral length direction of the lightning arrester element A.

Specifically, the receiving hole 2 has a bottom portion 2a having a substantially semi-cylindrical shape so as to be able to hold the lightning arrester element A;
A receiving groove 2b for the intermediate electrode _a2 is provided in the center. Three through holes 4, 4, 4 are formed through the receiving hole 2 on the outside in the length direction of the insulating base 1, and each through hole 4, 4, 4 has a stepped portion 5, 5, 5 and retaining portions 6, 6, 6 are formed, respectively. Each through hole 4, 4, 4 is connected to each electrode a ₁ , a ₂ , a ₃ of lightning arrester A.
Notches 7, 7, 7 are formed above the hole wall where the through holes 4, 4, 4 are located at intervals, and protruding walls 8, 7 are formed between the notches 7, 7, 7, respectively. 8 is formed. In addition, each through hole 4, 4, 4
Connecting terminals 9, 9, 9 are implanted in each of the connecting terminals 9, 9, and 9, respectively. The connecting element 9 includes a substrate 9a that extends vertically, a curved portion 9b that curves the upper part of the substrate 9a to hold each electrode circumferential surface of the lightning arrester A, and a substantially dogleg shape with the upper end of the curved portion 9b extending outward. It consists of a guide piece 9c molded as shown in FIG. Each of the connection terminals 9, 9, 9 is molded from a metal plate into the same shape. Connection terminal 9
For planting, if the insertion piece 9e is inserted from above the through hole 4 as a guide, the lower end of the substrate 9a will come into contact with the stepped part 5 of the through hole 4, and at the same time, the cut and raised piece 9d will lock into the retaining part 6. It is done as follows. In this state, the connection terminals 9, 9, and 9 are provided with electrode spacing apart from each other, the curved portion 9b faces into the receiving hole 2 from the notch 7, and the insertion piece 9e protrudes by a predetermined dimension from the bottom surface of the base. .

On the other hand, the receiving holes 3, 3 accommodate two thermistors.
The bottom portions _3a , 3a are large enough to fit loosely in each of the thermistors R1 and _R2 , and the bottom portions 3a, 3a are approximately semicircular so as to be able to hold the thermistors _R1 , _R2, respectively. Four through holes 10, . . . are provided through the respective receiving holes 3, 3, respectively. One through hole 10, 10, respectively
are arranged in the respective receiving holes 3, 3 located at the center in the length direction of the insulating base 1 so as to be spaced apart from each other in the width direction of the base, that is, on both outer sides. The other through holes 10, 10 facing these are formed in the insulating base 1.
In each receiving hole 3, 3 located on the right side in the length direction,
They are arranged close to each other in the width direction. Therefore, all the through-holes 10, . The through hole 10 has a stepped portion 11
and a retaining portion 12 are formed, respectively. Note that the through hole 10 is spaced apart from the wall surface of the receiving hole 3.

Two pairs of contact terminals 1 are provided in the through holes 10,...
3,... are planted respectively. Contact terminal 13
are made of metal plates molded into the same shape,
A board 13a extending vertically, a contact piece 13b extending in the shape of a flag to one side from the top of the board 13a, and a cut-and-raised piece 13c cut upward from the bottom of the board 13a.
and an insertion piece 13d extending narrowly from the lower end of the board 13a. The contact piece 13b is formed to such an extent that it can make surface contact with approximately half of the electrode surfaces _{r 1 ,} r ₁ , r ₂ , r ₂ of the thermistors R 1 and R ₂ , and exhibits a spring property with the substrate 13 a as an axis. Further, a soluble conductor 14 is provided on the contact piece 13b. Soluble conductor 1
4 is attached to the contact surface by plating or coating, and is made of a low-melting metal such as In, an alloy, or a conductive material. Although not shown, the fusible conductor 14 is connected to thermistors R ₁ and R ₂
They may be provided on the electrode surfaces r ₁ , r ₁ , r ₂ , r ₂ , or may be sandwiched between them.

Further, the contact terminal 13 is planted in the through hole 10.
By inserting the insertion piece 13d from above as a guide, the lower end of the substrate 13a comes into contact with the stepped portion 11, and at the same time, the cut-and-raised piece 13c is locked in the retaining portion 12. When planting, the contact pieces 13b, 13b of the contact terminals 13, 13 forming a pair are arranged so as to face each other. In this state, 2
Of the pair of contact terminals, one of the contact terminals 13, 13, which is connected to each of the connection terminals 9, 9 of the main electrodes _a1 , _a3 of the gas lightning arrester A through the printed circuit board P described below, They are spaced apart from each other outwardly, and their respective other contact terminals 13, 13 forming a pair therewith are spaced diagonally inward. In addition, the insertion pieces 13d, . . . of each contact terminal 13, . Contact pieces 13b, 13b of contact terminals 13, 13 forming a pair
The distance h and the wall thickness H of thermistors R ₁ and R ₂ are:
The relationship h<H is set. Also, the wall thickness H and the board 2
The distance l between 3a and 23a is set to the relationship H<l.

In addition, 15 in the figure is a leg stand protruding from the lower surface of the insulating base 1.

Further, in correspondence with the arrangement of the terminals 9,..., 13,..., the printed circuit board P has insertion holes _P1a and _P1b constituting the communication lines _L1 , _I1 connected, and similarly the communication lines L1, I1 are connected. Insertion holes P _3a and P _3b forming the lines L ₂ and I ₂ are connected. Insertion holes P _1b and P _3b are insertion holes
A ground wire E is arranged at the same interval as P _1a and P _31a , and connected to the insertion hole P _2a without jumper. Furthermore, on the extension side I ₁ and I ₂ ,
Insertion holes P _1c and P _2c are arranged close to each other.

Next, the operation based on the above configuration will be explained.

First, when the lightning arrester A is inserted into the receiving hole 2, each guide piece 9c,... is guided by the circumferential surface of each electrode _a1 to _a3 and expands, so that each curved part 9b,... ₁ ~ a ₃
This results in a fit and retention on the peripheral surface of the holder. Since each connection terminal 9, . . . is in a state of being pressed by the notch 7, .

After that, insert the thermistor R ₁ into the socket 3,
Depending on the wall thickness H of the thermistor _R1 , the contact piece 13b,
13b are pushed apart from each other and the thermistor _R1 is sandwiched between the contact pieces 13b, 13b. Thermistor _R1 is connected to the substrate 13a,
It is located diagonally so as to intersect with the diagonal direction of contact piece 13a, and is compressed by the elastic return force of contact pieces 13b, 13b. In this case, contact pieces 13b, 13
A series contact point is formed between b and the electrode surfaces r ₁ and r ₁ , respectively, and the contact point has a fusible conductor 14 ,
A pressurizing force is constantly applied with the electrodes 14 interposed, and the electrode surfaces r ₁ and r ₁ are connected to the contact pieces 13b and 13.
It is subjected to surface pressure by b. Insert thermistor _R2 as described above.

After insertion, the insulating base 1 is passed through an electric furnace or a high frequency furnace to heat the entire body, and the fusible conductors 14, ... melt and connect the contact points by melting.
A unit incorporating each element is formed. Since pressure is applied to the contact points, a secure and reliable connection can be made without the need for troublesome soldering work.

The unit manufactured in this manner is mounted so as to match the insertion hole spacing of the printed circuit board P. This installation constitutes a communication security device. The insulating substrate 1 constituting the unit is a printed circuit board P.
, so many can be installed in parallel.

According to the above embodiment, each element A,
The built-in unit can be constructed by simply inserting R ₁ and R ₂ into the receiving holes 2, 3, 3 of the insulating base 1, and the fusible conductors 14,... are melted by passing through the furnace. We were able to prevent contact failures at the series side contact points. In particular, since pressure is applied during the period from melting to solidification of the fusible conductors 14,..., there is no need to keep holding the contact points stationary as in the past, and troublesome soldering work etc. can be omitted. It can be implemented in the mass production process.

Furthermore, since the substrates 13a, 13a are arranged diagonally with the flag-shaped contact pieces 13b, 13b facing each other, contact terminals 13, . Not only can the thermistors R ₁ and R ₂ be sandwiched regardless of their wall thicknesses H, but also they can be strongly sandwiched by the elasticity of the contact pieces 13b and 13b in the sandwiching direction with the substrates 13a and 13a as an axis.

Furthermore, each connection terminal 9 that presses the lightning arrester element A,
... are reliably connected to the circumferential surfaces of the electrodes a ₁ ... a ₃ by the respective curved portions 9b, ..., and each connecting terminal 9, ... can be used with the same shape.

(6) Another embodiment of the invention Figure 9 is a plan view showing another embodiment, and Figure 10 is a plan view showing another embodiment.
Fig. 11 is a bottom view showing the arrangement of the insertion pieces of the terminal, and Fig. 12 is an explanatory diagram showing the mounting on a printed circuit board. In the drawings, the same reference numerals indicate the same parts, so duplicated explanations will be omitted.

20 and 21 are dual-purpose terminals, and the dual-purpose terminals 20 and 21 have the same structure as the connection terminal 9 and the contact terminal 13, and the substrates 13a and 13a
Contact pieces 20a and 21a are integrally formed on the other side of the upper part. The contact pieces 20a, 21a are connected by bending the connecting parts 20b, 21b at a substantially right angle,
guide pieces 21c, 21c whose upper ends are bent to one side;
It is composed of curved portions 20d and 21d whose lower portions are curved. The contact pieces 20a, 21a are bent in a direction away from each other, and the main electrodes a ₁ , a ₃ of the lightning arrester A
Press and hold. The dual-purpose terminals 20, 21 and the connection terminal 9 are arranged approximately at the center of the insulating base 1 at intervals of each electrode a ₁ to _{a 3} of the lightning arrester A, and corresponding through holes 22, . . . are provided. It is being

According to the above configuration, when the lightning arrester A is inserted,
Each guide piece 20c, 9c, 21c is expanded on the circumferential surface of each electrode _a1 to _a3 to form each curved portion 20d, 9b, 21d.
It is held in place and connected. In this case, the connection piece 20
a and 21a exhibit springiness in the bending direction of the connecting portions 20b and 21b. Then the thermistor R ₁
When inserted, the contact terminal portion of the dual-purpose terminal 20 functions as a pair of contact terminals 23 to sandwich the thermistor _R1 . Similarly, thermistor R ₂ is also used as terminal 2.
1 and the contact terminal 13, it is manufactured by melting the fusible conductor 14, . . . in an electric furnace or high frequency furnace.

According to this embodiment, although the common use of terminals is hindered, it is possible to achieve the same effect as described above, and
This has the advantage that the insertion hole of the printed circuit board P and the wiring can be simplified, and can contribute to further miniaturization of the insulating base 1. Note that the same effect can be achieved even if the positions of the dual-purpose terminals 20 and 21 are replaced.

(7) Another embodiment of the invention Figure 13 is a plan view showing another embodiment of the invention. Since the same reference numerals indicate equivalent parts, redundant explanation will be omitted.

In the figure, 30 is a divided base incorporating lightning arrester A;
Reference numeral 31 denotes a divided base into which two heat resistance elements R ₁ and R ₂ are incorporated, and the insulating base is constructed by combining both divided bases 30 and 31. If necessary, the combination side may be colored.

According to this embodiment, each element A or R ₁ , R ₂
The insertion work of the split base 3 can be simplified.
It is sufficient to pass only 1 through an electric furnace or a high frequency furnace, allowing efficient production. In particular, the divided base 3
It became possible to replace the element every 0.31.

Furthermore, although a thermistor has been described as the thermal resistance element in the above embodiments, other disk-shaped elements may also be used.

(8) Effects of the invention According to the invention, it is possible to provide a unit for mounting on a printed circuit board in which a three-pole button-type gas lightning arrester element and two thermal resistance elements are pre-assembled. A communication security circuit could be constructed simply by mounting it on a printed circuit board, and a large number of circuits could be mounted in parallel on a printed circuit board for multiple lines. Moreover, since a fusible conductor is sandwiched between the contact terminal and the electrode surface of the thermal resistance element, it is possible to establish a connection without poor contact on the series side simply by passing it through the furnace, making it possible to connect without contact failure on the series side. This eliminates the need for any soldering work, and can be put to practical use in mass production processes.
Furthermore, since the overall structure is roughly shaped and the contact terminals on both sides of the thermal resistance element are placed close to the 3-pole button-type gas lightning arrester side, the ground wire located in the middle of the printed circuit board Wiring between contact terminals was possible without jumper.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of a communication security device according to the present invention, Figure 2 is a partially cutaway perspective view of the communication security device according to the present invention, and Figure 3A is a cross-sectional view taken along the line - - in Figure 2. , Figure B is a left side view, Figure 4 is a top view, Figure 5 is a bottom view, Figure 6 is a sectional view taken along the - line in Figure 4, and Figures A, B, and C in Figure 7 are thermal resistances. An explanatory diagram showing how the element is plugged and connected, FIG. 8 is a schematic diagram showing how it is attached to a printed circuit board, FIG. 9 is a plan view showing another embodiment, and FIGS. 10A and B are other embodiments. FIG. 11 is a bottom view showing the arrangement of the insertion piece of the terminal, FIG. 12 is an explanatory view of the same showing how it is attached to a printed circuit board, and FIG. 13 shows another embodiment. FIG. A...3-pole button type gas lightning arrester, a ₁ , a ₂ , a ₃
... Electrode, R ₁ , R ₂ ... Thermistor, r ₁ , r ₂ ... Electrode, 1 ... Insulating base, 2, 3 ... Receiving hole, 9 ... Connection terminal, 13 ... Contact terminal, 13b ... ...contact piece,
14... Fusible conductor, 20, 21... Dual purpose terminal,
30, 31...Divided base.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A communication device in which a three-pole button-type gas lightning arrester is inserted in parallel between communication lines and the ground, and a plurality of thermal resistance elements are inserted in series in each communication line. In a safety device, an insulating base body incorporating a three-pole button-shaped gas lightning arrester element and two thermal resistance elements without lead wires on the side thereof in a substantially parallel arrangement is formed so that it can be mounted in parallel on a printed circuit board. The insulating base is provided with connection terminals to be connected to the electrodes of the three-pole button-type gas lightning arrester element, and two pairs of two thermal resistance elements are sandwiched between each electrode surface with a soluble conductor interposed therebetween. A communication device characterized in that a contact terminal is provided, and one of the two pairs of contact terminals arranged in parallel and located on both outer sides is arranged close to the three-pole button-type gas lightning arrester side. Security device. (2) In the utility model registration claim described in paragraph 1, of the two pairs of contact terminals, each of the other contact terminals located on the inside is arranged diagonally apart from the other contact terminal. A communication security device characterized by: (3) In the utility model registered in claim 1, the insulating substrate is assembled from a plurality of divided substrates in which a three-pole button-type gas lightning arrester element and two thermal resistance elements are individually incorporated. A communication security device characterized by: