JP3062013B2 - Circuit connection structure and data transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit connection structure for connecting a cable to an internal circuit of a case from outside the case, and a data transmission apparatus to which the structure is applied.

[0002]

2. Description of the Related Art An electronic device has an EEP-ROM inside.
(Electrically erasable P-ROM) or the like, and some of the storage units have device-specific address data or information written therein. In general, a ROM writer or the like, which is a data writing device, is used to write data in the storage unit. The ROM writer and the electronic device are connected as shown in FIG. It has become.

[0003] In the drawing, a case 1 is provided with a connector mounting hole 2 in which a male connector 3 is mounted, for example, and a terminal fitting of the male connector 3 is EEP-RO.
M4 is connected through an electric wire. On the other hand, a cable 6 is connected to the ROM writer 5, and the cable 6
Is provided with a female connector 7 that can be coupled to the male connector 3. Then, by connecting the male and female connectors 3 and 7, the ROM writer 5 and the EEPROM
4 is electrically connected to the ROM writer 5 and the EEP-ROM 4
Is transmitted and stored.

Further, the case 1 is provided with an environment-resistant cover 8 which closes a gap between the connector mounting hole 2 and the male connector 3 so as to prevent oil and dust from entering the case 1. Is provided.

[0005]

However, the provision of a cover not only increases the size of the entire device, but also requires the removal of the cover each time writing is performed, which is troublesome. On the other hand, as disclosed in Japanese Utility Model Publication No. 3-57024, it is conceivable to adopt a configuration that does not require a cover by mounting the connector mounting hole of the case with a connector made of conductive rubber so as to seal it. However, in this case, since the conductive rubber is exposed to the outside of the case, it cannot be said that if a water drop or the like is applied thereto, the terminals will be short-circuited and the device will not malfunction.

[0006] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a circuit connection structure which is easy to connect and has excellent environmental resistance.

[0007]

In order to achieve the above object, a circuit connection structure according to the present invention is a circuit connection structure for connecting a cable to a circuit board provided in the device. Has a terminal insertion hole through which a terminal provided on the cable can be inserted, and a conductive rubber material for closing the terminal insertion hole is provided inside the case of the terminal insertion hole, and the terminal insertion hole is provided on the circuit board. The present invention is characterized in that a contact that comes into contact with the conductive rubber material by elastically deforming the conductive rubber material by inserting the terminal into the hole is provided separately from the conductive rubber material (the invention of claim 1).

In the data transmission apparatus of the present invention, a plurality of terminal units having a storage unit on a circuit board are connected to a signal line connected to the master unit, and data transmission is performed between the master unit and the terminal units. In the data transmission device to be performed, a terminal insertion hole into which a terminal of a cable for transmitting data from the outside of the case is formed in a case of each terminal unit in the case of each terminal unit, and a conductive plug for closing the terminal insertion hole is formed. A rubber material is provided, and on the circuit board, the contact that comes into contact with the conductive rubber material by elastically deforming the conductive rubber material by inserting the terminal into the terminal insertion hole is separated from the conductive rubber material while being connected to the storage unit. It has a feature in the place where it is provided (the invention of claim 2).

[0009]

[0010]

[0011]

According to the first aspect of the present invention, in order to connect a cable to a device, a terminal provided on the cable is inserted into a terminal insertion hole formed in a case of the device, and a conductive plug for closing the terminal insertion hole is provided. Press against rubber material. When the terminal is further inserted into the terminal insertion hole and the conductive rubber material is elastically deformed, the conductive rubber material comes into contact with the contact on the circuit board.
As a result, the cable is brought into conduction with the circuit in the device through the conductive rubber material. When the terminal is pulled out from the terminal insertion hole, the conductive rubber material returns to the original shape, so that the conductive rubber material is separated from the contact and the conductive rubber material is insulated from the circuit in the device.

According to the second aspect of the present invention, in order to write data in the storage unit in the terminal unit, for example, R
The terminal of the cable led out from the OM writer is inserted into the terminal insertion hole of the terminal unit. Then, the terminal is further inserted into the inner part of the terminal insertion hole, and the conductive rubber material closing the terminal insertion hole is elastically deformed to be brought into contact with the contact on the circuit board. As a result, the ROM writer and the storage unit are electrically connected, and if data is transmitted from the ROM writer, the data is written to the storage unit. When the terminal is pulled out from the terminal insertion hole, the conductive rubber material returns to the original shape, so that the conductive rubber material is separated from the contact, and the conductive rubber material is insulated from the circuit and the like on the circuit board.

[0013]

[0014]

[0015]

According to the circuit connection structure and the data transmission device of the present invention, since the opening or the terminal insertion hole is always closed, dust or the like does not enter the case and is extremely excellent in environmental resistance. At the same time, connection is very easy because there is no need to provide a cover unlike the conventional case, and since the conductive rubber material is insulated from the circuit in the case when the terminal is not inserted, water droplets are applied to the conductive rubber material. However, the present invention has an effect of preventing a device or a terminal unit from malfunctioning.

[0016]

[0017]

【Example】

<First Embodiment> A first embodiment of a data transmission apparatus to which the circuit connection structure of the present invention is applied will be described below with reference to FIGS. Before describing the circuit connection structure of the present embodiment, a data transmission device will be briefly described. As shown in FIG.
And a plurality of terminal units 12. The master unit 11 and each terminal unit 12 are connected through a signal line 13. In each terminal unit 12, an EEP-ROM 15 connected to the circuit board 14 through an electric wire is provided. In the EEP-ROM 15, an address unique to the terminal unit 12 is written. For example, it is written so that addresses 1, 2,...

Now, the circuit connection structure will be described. FIG.
As shown in FIG. 2, two terminal insertion holes 19 for inserting terminal fittings 18 of a cable 17 described later are formed in the case 16 of the terminal unit 12 at predetermined intervals. Further, inside the case 16, one sheet of anisotropic conductive rubber 20, which is a conductive rubber material, is provided so as to cover each terminal insertion hole 19 at the same time. This anisotropic conductive rubber 20
Is a known structure having a property that current flows only in the thickness direction, that is, in the horizontal direction in FIG.

On the other hand, a communication circuit for transmitting and receiving data to and from the master unit 11 via the signal line 13 and an input / output circuit such as a sensor are provided on the circuit board 14, and two contacts 21 are provided. And one contact 2
1 is connected to the EEP-ROM 15 through an electric wire, and the other contact 21 is connected to the circuit ground. Further, each contact 21 is connected to the terminal insertion hole 19 of the case 16.
And anisotropic conductive rubber 2
It is provided at a fixed distance from 0.

As shown in FIG. 3, an address writing device 22 is used to write an address in the EEP-ROM 15, and a cable 17 extending from the address writing device 22 has a connector 23 are provided. The connector 23 has the terminal insertion holes 19
Two terminal fittings 18 that can be inserted into each of them are projected, one of the terminal fittings 18 is a signal terminal, and the other terminal fitting 18 is a ground terminal.

Next, the operation of this embodiment will be described. EE
To write an address in the P-ROM 15, the terminal fitting 18 of the cable 17 derived from the address writing device 22 is inserted into a terminal insertion hole 19 formed in the case 16 of the terminal unit 12, and the terminal insertion hole is inserted. It is pressed against anisotropic conductive rubber 20 that blocks 19. Then, when the terminal fitting 18 is further inserted into the terminal insertion hole 19 and the anisotropic conductive rubber 20 is elastically deformed inward of the case 16, the anisotropic conductive rubber 20 comes into contact with the contact 21 ( FIG.
reference). Thereby, each terminal fitting 18 of the cable 17
Are connected to each contact 21 through anisotropic conductive rubber 20, respectively.
And one terminal fitting 18 is connected to the EEP-ROM 15
And the other terminal fitting 18 is connected to the circuit ground. When data is output from the address writing device 22, the address is written to the EEP-ROM 15.

When the terminal fitting 18 is pulled out from the terminal insertion hole 19, the anisotropic conductive rubber 20 returns to its original shape, and the anisotropic conductive rubber 20 separates from the contacts 21 and moves away from the contact 21. And each contact 21 are insulated (see FIG. 1).

As described above, in the data transmission apparatus to which the circuit connection structure of this embodiment is applied, the terminal insertion hole 19 for inserting the terminal fitting 18 is always closed, so that the dust can be removed without providing the cover. And the like do not enter the case, which is extremely excellent in environmental resistance.Furthermore, since the cover does not have to be opened and closed each time, connection is very easy compared to the conventional connection structure with a cover. This has the effect of being When the cable 17 is not connected, the anisotropic conductive rubber 20 is insulated from the contact 21, so that water droplets and the like are formed between the anisotropic conductive rubber 20 through the terminal insertion holes 19 from outside the case 16. Even in this case, there is no short circuit between the contacts 21, so that the terminal unit 12 does not malfunction. Further, since the anisotropic conductive rubber 20 is used, the two terminal insertion holes 19 are formed in one sheet of the anisotropic conductive rubber 20.
It is very easy to assemble.

<Second Embodiment> A second embodiment of a data transmission apparatus to which the circuit connection structure of the present invention is applied will be described with reference to FIG.
This will be described with reference to FIG. The difference between the present embodiment and the first embodiment resides in the conductive rubber material.In the first embodiment, the anisotropic conductive rubber is used as the conductive rubber material. A conductive rubber material made of Others
The terminal insertion holes, contacts, terminal fittings, and the like are the same as those in the first embodiment.

As shown in FIG. 5, the conductive rubber material 31 for closing the terminal insertion hole 19 is provided inside the case 16 as in the first embodiment. The conductive rubbers 33 are alternately positioned, and the conductive rubbers 33 are disposed at positions where the terminal insertion holes 19 are closed. Further, among the conductive rubber members 31, a certain gap is provided between each conductive rubber 33 and each contact 21 provided on the circuit board 14.

Thus, the terminal fitting 1 of the cable 17
When 8 is inserted into the terminal insertion hole 19, each conductive rubber 33 is elastically deformed toward the inside of the case 16 by the terminal fitting 18, and comes into contact with each contact 21. That is, similarly to the first embodiment, each terminal fitting 18 of the cable 17 and each contact 2
1 is conducted, the address writing device 22
Data can be transmitted to the P-ROM 15 and EEP
The address is written to the ROM 15; Also, as in the first embodiment, each terminal fitting 18 is inserted into a terminal insertion hole 19.
The conductive rubber 33 returns to its original shape, and the conductive rubber 33 and the contact 21 are separated to be insulated.

As described above, in this embodiment, as in the first embodiment, the terminal insertion hole 1 for always inserting the terminal fitting 18 is provided.
Since the cover 9 is closed, dust and the like do not enter the case 16 even without providing a cover, which is extremely excellent in environmental resistance. Further, the cover does not have to be opened and closed each time. The effect is that the connection is very easy as compared with the conventional connection structure provided with a cover. Further, since the conductive rubber 33 is insulated from the contact 21 when the cable 17 is not connected, the contact 21 is not short-circuited even if water droplets or the like are attached to the conductive rubber 33 from outside the case 16. The terminal unit 12 does not malfunction.

<Third Embodiment> Hereinafter, a third embodiment of a data transmission apparatus to which the circuit connection structure of the present invention is applied will be described with reference to FIG.
This will be described with reference to FIG. The difference between the present embodiment and the first embodiment lies in a configuration in which the terminal insertion hole is closed by a conductive rubber material,
In the first embodiment, the structure is closed by one sheet of anisotropic conductive rubber, but in the present embodiment, the structure is closed separately by two sheets of conductive rubber. In addition, since the terminal insertion holes, contacts, terminal fittings, and the like are the same as those in the first embodiment, the same portions are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 6, two terminal insertion holes 19 formed in the case 16 are separately provided with the conductive rubber 4.
1 closes the inside of the case 16. Further, a certain gap is provided between the conductive rubbers 41 so that the conductive rubbers 41 do not short-circuit. Also,
A fixed gap is provided between each conductive rubber 41 and each contact 21 provided on the circuit board 14 as in the first embodiment.

Thus, when each terminal fitting 18 of the cable 17 is inserted into the terminal insertion hole 19, each conductive rubber 41 is elastically deformed toward the inside of the case 16 by the terminal fitting 18, and comes into contact with each contact 21. . That is, each terminal fitting 18 of the cable 17 is connected to the EEP-ROM 15 and the circuit ground via the conductive rubber 41, respectively. Therefore, data can be transmitted from the address writing device 22 to the EEP-ROM 15 as in the first embodiment, and the address is written to the EEP-ROM 15. As in the first embodiment, when each terminal fitting 18 is pulled out from the terminal insertion hole 19, each conductive rubber 41 returns to the original shape, and the conductive rubber 41 and the contact 21 are insulated.

As described above, in this embodiment, as in the first embodiment, the terminal insertion holes 19 for inserting the terminal fittings 18 are always closed. 16, the connection resistance is extremely excellent, and the connection is very easy as compared with the conventional connection structure provided with a cover. Further, since the conductive rubber 41 is insulated from the contact 21 when the cable 17 is not connected, the terminal unit is not short-circuited even if water droplets or the like are attached between the conductive rubber 41 from the outside of the case. 12 does not malfunction.

The present invention is not limited to the above embodiments, but can be modified as follows, for example, and these embodiments also belong to the technical scope of the present invention. (1) In each of the above embodiments, the circuit connection structure of the present invention is applied to a terminal unit of a data transmission device. However, the present invention is not limited to this. It can be widely applied to a connection structure for connecting an internal circuit to a circuit.

(2) In each of the above embodiments, the anisotropic conductive rubber 20, the conductive rubber material 31, and the conductive rubber 41
7, the anisotropic conductive rubber 51 and the like are provided outside the case 16 so as to cover the terminal insertion hole 19, as shown in FIG. May be. When the anisotropic conductive rubber 51 is pressed from the outside by the terminal fitting 18, the contact protrusion 51a inserted into the terminal insertion hole 19 is elastically deformed and the circuit board 1 is deformed.
4 and contact the contact 21 on it. In addition, the present invention can be implemented with various modifications without departing from the scope.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a circuit connection structure in a first embodiment.

FIG. 2 is a cross-sectional view showing a state where terminal fittings are connected in the embodiment.

FIG. 3 is a schematic sectional view showing the whole of the embodiment.

FIG. 4 is a wiring diagram showing the data transmission device of the embodiment.

FIG. 5 is a sectional view showing a circuit connection structure in a second embodiment.

FIG. 6 is a sectional view showing a circuit connection structure in a third embodiment.

FIG. 7 is a longitudinal sectional view showing a circuit connection structure in another embodiment.

FIG. 8 is a schematic sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Master unit 12 ... Terminal unit 13 ... Signal line 14 ... Circuit board 15 ... EEP-ROM (storage part) 16 ... Case 17 ... Cable 18 ... Terminal fitting (terminal) 19 ... Terminal insertion hole (opening) 20 ... Different Anisotropic conductive rubber 21: Contact 31: Conductive rubber 41: Conductive rubber (conductive rubber)

Claims (2)

(57) [Claims] 1. A circuit connection structure for connecting a cable to a circuit board provided in a device, wherein a terminal insertion hole for inserting a terminal provided in the cable is provided in a case of the device. A conductive rubber material that is formed and closes the terminal insertion hole is provided inside the case of the terminal insertion hole, and the conductive rubber material is formed on the circuit board by inserting the terminal into the terminal insertion hole. A circuit connection structure, wherein a contact that elastically deforms and comes into contact with the conductive rubber material is provided separately from the conductive rubber material. 2. A data transmission apparatus according to claim 1, wherein a plurality of terminal units having a storage unit on a circuit board are connected to a signal line connected to the master unit, and data transmission is performed between the master unit and the terminal units. The case of each of the terminal units has a terminal insertion hole through which a terminal of a cable for transmitting data from outside of the case is inserted into the storage unit, and a conductive rubber material for closing the terminal insertion hole. Is provided on the circuit board, and a contact that contacts the conductive rubber material by elastically deforming the conductive rubber material by insertion of the terminal into the terminal insertion hole is formed on the circuit board. A data transmission device provided apart from a rubber material .