JPS61289592A - Connecting device for external memory device - Google Patents

Abstract

PURPOSE:To decrease the unnecessary electric current to flow on the data line by constituting so that when an external memory device is fitted at a main body side, the terminal for an electric power source at the main body side and the external memory device side are allowed to contact with each other before terminals for both data lines are allowed to contact with each other. CONSTITUTION:When the memory device is inserted into a main body side storing part 13, first, an electrode 9 for the earth is allowed to contact with an electrode 15 for the earth at the main body side, and further, when the device is deeply inserted, an electrode 8 for the electric power source is allowed to contact with an electrode 12 for the electric power source at the main body side. Then, by contacting the electrode for the electric power source and the earth electrode before both electrodes for the data are allowed to contact with each other, the electric power source voltage at the main body side and the voltage impressed to the electric power source of a memory terminal 3 at the memory device side come to equal. When further the memory device is deeply inserted, an electrode part 5 for the data line at the memory device side is fitted to a connector 16 for the data line at the main body side, and respective electrodes for the data are connected. Thus, when the data lines are connected each other, it can be prevented that the unnecessary electric current flows on the data line, and the semiconductor device such as a memory element can be protected.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an external storage device connection device for connecting a cartridge type external storage device used in a personal computer or other equipment to a main body.

2. Description of the Related Art Conventionally, the connection between a cartridge-type external storage device (hereinafter referred to as an external storage device) equipped with an internal backup battery and the main body of a personal computer, etc., was configured as shown in Figure 3. .

That is, a connector 21 to which the power supply line and each data line are connected is provided at the bottom of the external storage device 20, and a connector 23 to be connected to the connector 21 is provided at the bottom of the external storage device housing section 22 on the old main body side. It is being A microswitch 24 is inserted onto the power line connected to the connector 23, and the microswitch 24 is fixed so that its action point 25 protrudes into the accommodating portion 22. A protrusion 26 for pressing the button part 25 of the microswitch 24 is provided on the side surface of the casing of the one-sided part storage device 20.

First, when you insert the external storage device 20, the connector 2
Before 1 and 23 are connected, the protrusion 26 hits the action point 25 and pushes it, cutting off the power line on the main body side. Next, each electrode of the connector 21 contacts each electrode of the connector 22, and the power line and data line in the connectors 21 and 23 are brought into conduction. By further inserting the external storage device 20 deeper, the connector 21 and the connector 22 are completely connected, and the protrusion 26 is separated from the action point portion 25. Therefore, the power supply line on the main body side is connected again, and the power supply voltage is applied from the main body side to the storage device side.

As described above, conventionally, when the data line is connected, the power supply line on the main body side is cut off to prevent unnecessary current from flowing from the power supply on the main body side to the memory element 27 inside the storage device. The memory element 27 is protected.

Problems to be Solved by the Invention However, in the above configuration, the external storage device 20
When the external storage device 20 is inserted into the main body and the power line is connected when the voltage of the internal backup battery 28 and the power supply voltage on the main body side are significantly high, the potential difference between the two power lines causes There was a fear that the generated current would increase and a portion of this current would flow within the storage element 27 and destroy the storage element. The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a connection device for an external storage 1f device that is low in cost and eliminates the risk of damaging the memory element. Means for Solving the Problems In the present invention, the power supply terminals on the main body side and the external storage device side come into contact with each other before the data line terminals on both sides come into contact with each other when the external storage device is attached to the main body side. It was configured to do so.

Effect: With the above means, the power supply terminals are connected before both data line terminals are connected, and both power supply voltages become equal. By equalizing both power supply voltages, the Trisure type external storage device reduces unnecessary current flowing on the data lines when the data lines are connected.
1 is a housing, 2 is a printed circuit board housed in the housing 1, 3
4 is a memory element provided on the printed circuit board 2, and 4 is a backup battery for backing up data in the memory element 3 provided on the printed circuit board 2. Reference numeral 5 denotes a data line electrode portion of the printed circuit board 2 which is inserted into a data line card edge connector on the main body side of a personal computer or various devices. 6 is a protrusion provided on one side of the printed circuit board 2; 7 is a protrusion provided on the other side of the printed circuit board 2; the protrusion 7 is provided closer to the electrode section 5 than the protrusion 6; It will be done. 8 is a protrusion 6 of the printed circuit board 2
This is a power supply electrode provided at the tip of the

Reference numeral 9 denotes a grounding electrode provided at the tip of the protrusion 7 of the printed circuit board 2. 10 is a slit provided on one side of the housing 1 from which the electrode 8 protrudes, and 11 is a slit provided on the other side of the housing 1 from which the electrode 9 protrudes.

FIG. 2 is a diagram showing the connection of the power supply lines of the storage unit and the main body of a personal computer or the like in this embodiment. Reference numeral 12 denotes a plate-shaped main body side power source electrode provided on one inner surface of the external storage device accommodating portion 13 on the main body side.
Connected to the positive side of 4. One end of the electrode 12 is in the housing part 1
The inlet end of 3 has been reached. Reference numeral 15 denotes a main body side grounding electrode provided on the other inner side surface of the accommodating portion 13;
Connected to the negative side of Like the electrode 12, the electrode 15 also has one end reaching the inlet end of the accommodating portion 13. 1
Reference numeral 6 denotes a data line connector on the main body side, which is provided at the bottom of the accommodating portion 13.

The electrode 8 is connected to the power supply terminal VCC of the memory element 3 and to the positive side of the 5V backup battery 4. On the other hand, the electrode 9 is connected to the ground terminal GND of the memory element 3 and to the negative side of the battery 4 .

The operation of this embodiment will be explained below. When the storage device is inserted into the main body housing section 13, the grounding electrode 9 first comes into contact with the grounding electrode 15 on the main body side. When inserted deeper, the power supply electrode 8 comes into contact with the power supply electrode 12 on the main body side. Here, the battery 4 in the storage device before being inserted into the main body.
If the voltage has dropped to 5V or less, for example to about 4.5V, the voltage generated at the data line electrode on the storage device side is about 4.5V. On the other hand, the power supply voltage on the main body side is 5V, and the voltage generated at the data line terminal on the main body side is also about 5V.

Therefore, by bringing the power supply electrode and the ground electrode into contact before their data electrodes come into contact with each other, the power supply voltage on the main body side and the voltage applied to the power supply terminal of the storage terminal 3 on the storage device side become equal. Therefore, there is no possibility that the voltages generated on the two data line electrodes are significantly different, and when these two electrodes are brought into contact, current will not flow from the power supply side into each semiconductor device such as a memory element through the data line. (Thus, destruction of memory elements etc. can be prevented.

After the power supply electrode and ground electrode of both sides come into contact, when the storage device is further inserted deeper, the data line electrode section 5 on the storage device side will fit into the data line connector 16 on the main body side, and the respective data Electrodes are connected.

Effects of the Invention In the present invention, the power supply terminals on the main body side and the external storage device side are
When attaching an external storage device to the main body side, by configuring the terminals for both data lines to contact each other before they contact each other, the power applied to both semiconductor devices, etc. is reduced before the data lines become conductive. It is possible to equalize the voltages, prevent unnecessary current from flowing on the data lines when the data lines are connected, and protect semiconductor devices such as memory elements.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a cartridge type external storage device in an embodiment of the present invention, FIG. 2 is a wiring diagram of a storage device in an embodiment of the invention, and FIG. 3 is a wiring diagram of a storage device in a conventional embodiment. be. 1... Housing 2... Printed circuit board 3... Memory element 4... Backup battery 5... Data line electrode part 6... Power supply electrode 8... ...Grounding electrode 12...Body side power supply electrode 15...Body side grounding electrode 16...Body side data line connector Name of agent: Patent attorney Toshio Nakao and one other person Figure 1 f
- Housing $ 2 - - ] 1 piece Y coarse 3 - side t1 each 4 - 1 square, Hidehito hole for 7 feet 5 - - Dig - Connector for 1 line Fig. 2 f2 - Enhancement of Kaishun +5--- No. Earth...+6--
, Desolai:/Japanese Nekuge Figure 3

Claims (1)

[Claims] In a connection device for connecting a cartridge type external storage device equipped with a data backup battery to the main body side of a personal computer, a first terminal connected to the positive electrode side of the data backup battery to the external storage device;
A second terminal connected to the negative electrode side of the data backup battery and a data line terminal for inputting and outputting data are provided, and a third terminal connected to the positive electrode side of the main body power supply is provided on the main body side. , a fourth terminal connected to the negative electrode side of the power supply on the main body side, and a data line terminal connected to the data line terminal on the external storage device side, respectively, and when the external storage device is attached to the main body side, the external The configuration is such that the first terminal and the third terminal and the second terminal and the fourth terminal come into contact before the data line terminal on the storage device side comes into contact with the data line terminal on the main body side. Features: External storage device connection device.