JPS637999Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a cartridge containing a semiconductor memory.

BACKGROUND TECHNOLOGY AND PROBLEMS Conventionally, memory cartridges have been known that house semiconductor memories in which information such as programs is stored and that can be easily attached to and detached from electronic devices such as microcomputers. In conventional memory cartridges, in order to prevent electrostatic damage to the internal semiconductor memory, a synthetic resin cover is provided over the terminal section of the printed wiring board that carries the semiconductor memory, and the terminal section is covered with a cover made of synthetic resin. Some were made so that they could not be touched directly, and some had all terminals shorted with conductors when not in use.

However, the former has disadvantages in that it is powerless against high-voltage static electricity, and the latter has a complicated structure, leading to an increase in price.

Purpose of the Invention In view of the above, an object of the present invention is to provide a memory cartridge which has a simple structure but can reliably prevent electrostatic damage to a semiconductor memory.

Summary of the invention The present invention includes a case that houses a printed wiring board equipped with a semiconductor memory, a conductive shielding member disposed in the opening of the case, and a conductive shielding member that is movable within the opening of the case. A memory cartridge comprising a first conductive spring for contact support and a second conductive spring interposed between the first conductive spring and a ground pattern of a printed wiring board, the memory cartridge comprising: a semiconductor memory; Electrostatic damage can be reliably prevented.

Embodiment Hereinafter, an embodiment of a memory cartridge according to the present invention will be described with reference to the drawings.

FIG. 1 shows an exploded view of an embodiment of a memory cartridge according to the present invention. In FIG. 1, 1 is a semiconductor memory (IC memory), 2 is a printed wiring board, and the semiconductor memory 1 is mounted on the printed wiring board 2. A plurality of terminals 3 are provided at one end of the printed wiring board 2.
A ground pattern 4 is provided extending from the ground terminal 3e of the ground terminal 3e to the through hole 5 in the center of the wiring board 2. Although not shown, other terminals of the plurality of terminals 3 are connected to each pin of the semiconductor memory 1 via other conductive patterns on the printed wiring board 2.

6 is a notch on the periphery of the wiring board. 7 is a compression coil spring, and 8 is a leg spring, both of which are made of metal wire, and this leg spring 8 has a coil portion 8c and a pair of leg portions 8l extending from the coil portion 8c and crossing each other. The tip 8f of the leg 8l is bent to ensure sliding contact with a shielding plate 30, which will be described later. Further, the coil diameter of the coil spring 7 and the diameter of the coil portion 8c of the spread leg spring 8 are approximately equal to the diameter of the ground pattern 4 around the through hole 5 of the printed wiring board 2.

9 is a coupling screw, 10 is an upper half of the casing, 20 is a lower half of the casing, both casing halves 10 and 20 are synthetic resin molded products;
are combined together to form the case 40. The detailed structure of both housing halves 10 and 20 will be described later.

30 is a metal shielding plate, and is provided with a long hole 31 for concealing the terminal 3 of the printed wiring board 2. Further, bent portions 32 and 33 are provided on a portion of the long side and short side of the shielding plate 30, respectively.

Next, the detailed structure of the housing halves 10 and 20 will be explained with reference to FIGS. 2 and 3.

In FIG. 2, the upper housing half 10 is the upper plate 11
and a side wall 12 that covers the upper plate 11.
One of the long sides of the side wall 1 is partially cut out to form an opening 13. 14 is a pair of elastic hooks, 15
is a cylindrical protrusion, and the top of the cylindrical protrusion 15 has a peripheral edge 15c that is higher than the elastic hook 14.
It is also planted on the inner surface of the upper plate 11. Reference numeral 16 denotes a pair of guide protrusions, which are provided outward from the edge of the opening 13. 17 is a pair of support protrusions.
Reference numeral 18 indicates the back side of a recessed portion (formed with a large number of protrusions along the long sides) on which a finger is placed when inserting and removing the cartridge into an electronic device.

In FIG. 3, the lower housing half 20 is a lower plate 21.
and a side wall 22 that covers the lower plate 21.
One of the long sides of the side wall 1 is partially cut out to form an opening 23. 24 is a pair of locking pieces, and 25 is a cylindrical projection. Both the locking piece 24 and the cylindrical projection 25 are connected to the elastic hook piece 14 and the cylindrical projection of the upper case half 10 on the inner surface of the lower plate 21. A screw hole is provided at the top 25t of the cylindrical projection 25, and the base 25b has a larger diameter than the top 25t. Reference numeral 26 denotes a pair of guide protrusions, which are provided outward from the edge of the opening 23. 27 is a pair of locking support pieces;
28 is a support piece, both of which are attached to the printed wiring board 2 mentioned above.
It is established to support the

The assembly procedure of this embodiment is as follows.

A shielding plate 30 is placed inside the opening 23 of the lower housing half 20. The bent portion 33 of the shielding plate 30 comes into slidable contact with the protrusion 26 .

The tip end 8f of the leg spring 8 is brought into contact with the inside of the bending part 32 of the shielding plate 30, and the coil part 8c
is engaged with the cylindrical projection 25. Due to the elasticity of the leg spring 8, the end of the shielding plate 30 comes into contact with the inner side of the edge of the opening 23.

The coil spring 7 is engaged with the cylindrical projection 25.

The printed wiring board 2 is locked to the locking support piece 27 at the notch 6. Terminals 3 of printed wiring board 2 are located inside shielding plate 30. Further, a cylindrical protrusion 25 passes through the through hole 5 of the wiring board 2, and the earth pattern 4 surrounding the through hole 5 and the shielding plate 30 are electrically connected via the coil spring 7 and the spread leg spring 8. be done.

The upper housing half 10 is engaged with the lower housing half 20. The elastic hook piece 14 of the upper housing half 10 and the locking piece 24 of the lower housing half 20 engage with each other. Further, the vicinity of the through hole 5 of the printed wiring board 2 is sandwiched between the top peripheral edge 15c of the cylindrical projection 15 and the large diameter base 25b of the cylindrical projection 25, and furthermore, the support projection 17 and the notch 24a of the locking piece 24 are held together. and restricts movement of the printed wiring board 2 in the thickness direction.

Both casing bodies 10 and 20 are joined together with screws 9.

In the memory cartridge of this embodiment assembled according to the above-described procedure, the terminals 3 of the printed wiring board 2 are hidden inside the shielding plate 30 connected to the ground pattern 4, so that static electricity does not reach the terminals 3. There is no direct discharge, and therefore the semiconductor memory 1 is not destroyed by discharge.

Further, when the memory cartridge of this embodiment is installed in an electronic device, the shielding plate 30 is attached to the lower case by the insulator of the printed wiring board connector (not shown) provided on the electronic device side. Locking piece 24 of half part 20
Since the terminals 3 of the printed wiring board 2 are exposed from the long holes 31 of the shielding plate 30 and come into contact with the contacts of the connector, the electronic device and the semiconductor memory 1 are connected in a predetermined state. Ru.

Effects of the invention As detailed above, according to the invention, the shielding plate 3
0 and the ground pattern 4 of the printed wiring board 2 are connected by the two springs, electrostatic damage to the semiconductor memory can be reliably prevented. In addition, the spring structure is simple, making it easy to assemble.
Does not cause cost increases.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of an embodiment of a memory cartridge according to the present invention, and FIGS. 2 and 3 are perspective views of upper and lower housing halves thereof, respectively. 1 is a semiconductor memory, 2 is a printed wiring board, 4 is a ground pattern, 7 is a coil spring, 8 is an open leg spring, 1
0 is an upper half of the case, 20 is a lower half of the case, 30 is a shielding plate, and 40 is a case.

Claims (1)

[Scope of utility model registration request] A case for accommodating a printed wiring board on which a semiconductor memory is mounted, a conductive shielding member disposed in an opening of the case, and a first member that contacts and supports the shielding member so as to be movable within the opening of the case. A memory cartridge comprising: a conductive spring; and a second conductive spring interposed between the first conductive spring and the ground pattern of the printed wiring board.