JPS59163617A - Package method of terminating resistor - Google Patents

Abstract

PURPOSE:To ensure the effective package of a terminating resistor by pressing a connector for terminating resistor with a bus buffer circuit to open the area between the terminating resistor and a back panel and resetting the terminating resistor to close the bus buffer circuit after pulling of said buffer circuit. CONSTITUTION:A bus buffer circuit 25 is formed on a printed board having a form approximately equal to a printed board 14, and a bus buffer circuit connector 26 is set opposite to a plug connector 13. At the same time, a terminal part of a flar cable 28 connected to a back panel 12 of an increased shelf is attached at the fringe at the other side of the circuit 25. When the circuit 25 is attached to a contact 13a of the connector 13, the circuit 25 is connected to the panel 12. Thus a bus line can be extended. In this case, the tip of a guide pin 27 piercing through an insertion hole 23 presses the end face of a housing 16 of a terminating register 15. Thus the register 15 is slid in the direction where the resistor 15 is separated from the connector 13, and therefore the connection is cut off between a contact bar 17 and a contact 13b.

Description

DETAILED DESCRIPTION OF THE INVENTION tar Technical Field of the Invention The present invention relates to a method for mounting a termination resistor in, for example, an electronic circuit device.

tbl technology background We believe that a microprocessor device is appropriate.

The block diagram of the microprocessor system is shown in FIG. The output circuits 5 are connected to each other by a pass line, and a terminating resistor 6 is connected to the end of the pass line circuit for impedance matching.

Now, when expanding such a microprocessor system and extending the bus, a path buffer 7 is inserted in place of the conventional terminating resistor 6, as shown in FIG. 1 (b), and an input circuit 8. Connect the output circuit 9.

Then, a terminating resistor 10 must be connected to the end of the expanded pass line circuit.

(C) Prior art and problems This type of microprocessor device generally has an MPU,
Generally, the ROM, RAM, input circuit, and output circuit are formed into a printed board and inserted into connectors arranged in parallel on a back panel on which desired path lines are formed.

A conventional method for mounting a terminating resistor is to extend the terminal end of a required pattern of the pass line on the back panel, connect it to the end of the back panel, and connect it to the terminal of the terminating resistor connector. A terminating resistor is constructed by mounting terminating resistors corresponding to each circuit on a printed board, and a contact portion of this terminating resistor is inserted into the terminating resistor connector.

To expand the microprocessor system, this terminating resistor is removed and removed, and a pass buffer circuit formed on another printed board is inserted into this terminating resistor connector. This pass buffer circuit is connected to the added back panel using a flat cable.

However, when expanding the system, it is troublesome to remove the terminating resistor and inserting a pass buffer circuit each time, and the removed terminating resistor must be stored in case the expanded system is restored. It's kind of annoying.

tdl OBJECTS OF THE INVENTION An object of the present invention is to provide a method for mounting a termination resistor in which the above-mentioned conventional problems are eliminated.

16+ Structure of the Invention In order to achieve this object, the present invention includes a microprocessor path terminating resistor that is inserted into the back panel via a connector using elastic means, and the surface on which the terminating resistor is inserted is The circuit between the terminating resistor and the back panel is opened by pressing the core back spring on the opposite side, and when the pass buffer circuit is removed, the core terminating resistor returns to close the circuit.

(fl Embodiments of the Invention The present invention will be described in detail below with reference to illustrated embodiments.

FIG. 2 is a side view of one embodiment of the present invention, in which (a) is a side view before the pass buffer circuit is inserted, and (b) is a side view after the pass buffer circuit is inserted.

In the same figure, a mounting plate 11a on the bottom of the λ box-shaped shelf 11 is attached to the back panel on which the desired pass line is formed.
Connectors (not shown) are installed in parallel on the back panel 12, and each connector has a 1VfP
U, ROM, PAM, input circuits, and output circuits are inserted into a large number of printed boards 14.

The contacts of the plug connector 13 are insert-molded and arranged through the housing, protruding from one end surface to become a contact 13a, and protruding from the other end surface to serve as a terminal portion/contact 13b.

In the plug connector 13, the base terminals of the contacts 13b are inserted into through holes arranged at the end of the back panel 12, and the contacts 13a are inserted parallel to the aforementioned connector into which the printed circuit board 14 is inserted. It is mounted so as to protrude inside the shelf 11.

The through holes into which the plug connectors 13 are inserted are respectively connected to the pattern at the end of the required path line.

The terminating resistor 15 is integrated with a housing 16 of a jack connector inserted into the contact 13-it, and a terminating resistor 18 is installed on each contact piece 17 of the jack connector that contacts each of the contacts 13b. It is connected. This terminating resistor 18 is made of, for example, a thick film resistor pattern, is small, and is particularly easy to attach when integrated into the housing 16.

Housing 16 is desirably larger than the housing of plug connector 13. On the back of the shelf 11, connect the terminating resistor 1
In the part corresponding to 5, there is a resistor support case 19 which is U-shaped in side view.
is installed so as to cover the terminating resistor 15 section. The bottom plate member 19a of the resistor support case 19 has a pair of guide pins 2 that loosely pass through the guide hole of the housing 16.
1 is installed. Also, each guide pin 21
A compression coil spring 20 is installed around the periphery between the end surface of the housing 16 opposite to the plug connector side 13 and the bottom plate member 19a. Therefore, the terminating resistor 15 is supported and guided by the guide pin 21 and is slidable in the direction of insertion into the plug connector 13, and is normally pressed in the direction of the plug connector 13 by the elasticity of the compression coil spring 20. As a result, the contact piece 17 is in contact with the contactor 13b.

The pass buffer circuit 25 is formed on a printed board having the same shape as the printed board 14, and a pass buffer circuit connector 26 is mounted opposite the plug connector 13, and the back panel of the additional shelf ( A terminal portion of a flat cable 28 is attached to the terminal (not shown). The contact piece (not shown) of the pass buffer circuit connector 26 is inserted into the insertion hole of the back panel 12 from the end face of the housing 26a of the pass buffer circuit connector 26 so that the contact piece 13a of the plug connector 13 is smoothly inserted. A pair of Gaitobi/27 are prominent. Note that this guide pin 27 also passes through the insertion hole 22 of the mounting plate 11a.

When the pass buffer circuit 25 configured in this manner is inserted into the contact 13a of the plug connector 13, it is connected to the back panel 12 and the pass line can be extended.

In this case, the tip of the guide pin 27 passing through the insertion hole 23 of the back panel 12 is connected to the housing 16 of the terminating resistor 15.
Connect the terminating resistor 15 to the plug connector 1 by pressing the end face of the
Slide it in the direction away from 3. Therefore, contact piece 17
The connection between the contactor 13b and the contactor 13b is disconnected.

Note that when the pass buffer circuit 25 is removed, the termination resistor 15
is returned by the elasticity of the compression coil spring 20, the contact piece 17 and the contactor 13b come into contact, and the circuit of the terminating resistor is closed.

In addition, as a resilient means for inserting the terminating resistor connector,
A leaf spring may be used, or a portion of the bottom of the resistor support housing may be deformed into a leaf spring shape.

tg+ Detailed Description of the Invention As described in the present invention, the terminating resistor is removed when the pass buffer circuit is inserted, and the terminating resistor is automatically inserted when the pass buffer circuit is removed. This method of mounting a terminating resistor has excellent practical effects, such as not having to bother with special storage of the device.

[Brief explanation of the drawing]

Fig. 1 (a) and (b) are block diagrams of the microprocessor system, Fig. 2 is a side view of one embodiment of the present invention, (a) is a side view before inserting the pass buffer circuit, and (b) is a side view after inserting the pass buffer circuit. FIG. In the figure, 1 is MPIJ, 2 is ROM, 3 is RAM, 4
, 8 is an input circuit, 9 is an output circuit, 6.10 is a terminating resistor, 7 is a bus buffer 11 is a shelf, 12 is a back panel, 13 is a plug connector, 13a, 13b is a contactor 14 is a printed board, 15 is a terminating resistor 16 is a housing, 17 is a contact piece, 18 is a terminal resistor, 20 is a compression coil spring, 21.27 is a guide bin, 25 is a pass buffer circuit, 26 is a pass buffer circuit connector, and 28 is a flat cable. -1 [1st M (A2

Claims (1)

[Claims] For example, in an electronic circuit device, etc., in which printed boards are arranged side by side on a back panel on which a pattern is formed, a terminating resistor of a bus of the electronic circuit is inserted into the back panel via a connector using elastic means of an elastic body. , press the spring connector on the side opposite to the side where the terminating resistor is inserted to open the circuit between the terminating resistor and the back panel, and when the pass buffer circuit is removed, the terminating resistor returns to normal. A method for mounting a terminating resistor, which is characterized in that the circuit is closed using a terminating resistor.