JP2003203692A - Connector device for card - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a circuit or the like in a card from being broken when inserting a card charged with static electricity. <P>SOLUTION: Long-hole openings 24 are oppositely formed in both left and right sides of the bottom of a card-inserting part 21 to construct in such a manner that the shortest distance A1 from a contact part 12a for ground of a card 10 in the course of insertion to the opening 24 becomes shorter than the shortest distance A2 from a contact part 12c for signal, whereby static electricity charged on the card is easily discharged from the contact part 12a to ground to a ground pattern 31 of a circuit board 30 through the opening 24, and a circuit or the like in the card 10 can be prevented from being broken. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a card connector device for mounting a card in which an IC or the like constituting a memory is mounted.

[0002]

2. Description of the Related Art Generally, a card connector device to which a small memory card is mounted is provided with a resin housing 1 as shown in FIG. 12, and a memory card 2 is inserted into the housing 1. The card insertion portion 3 and the plurality of terminals 5 that come into contact with the contact portions 4 of the memory card 2 inserted in the card insertion portion 3 are arranged in parallel. The housing 1 is provided with a metal cover 6 that covers the card insertion portion 3, and a part of the cover 6 is soldered to the ground pattern of the circuit board 7.

[0003]

By the way, if the memory card to be inserted into the card insertion portion is electrostatically charged or the operator who inserts the card is electrostatically charged, the memory card is inserted or during insertion. Static electricity may be generated from the contact part of the card to the cover.
However, in the conventional structure, if not sure which discharge from the contact portion to the cover occurs for each of the shortest distance is the same from the contact portion to the cover, the discharge from the contact portion of the ground occurred memory Although it does not affect the circuit inside the card, when discharge occurs from the contact part for the signal, a voltage of several thousand to ten thousand volts is generated in the signal line of the circuit inside the memory card and recorded in the IC or memory inside the card. There is a risk that the created data will be destroyed.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a card connector device capable of preventing a circuit or the like in a card from being destroyed when an electrostatically charged card is inserted. It is in the place of providing.

[0005]

In order to achieve the above object, a card connector device according to a first aspect of the present invention comprises a card insertion portion into which a card is inserted, and contact portions of the card inserted into the card insertion portion. Equipped with multiple terminals that contact each other,
In the card connector device mounted on the circuit board,
Each contact portion has at least a ground contact portion and a signal contact portion, and the card insertion portion includes a pair of resin guide portions for guiding the insertion of the card and a circuit board on the bottom surface between the pair of guide portions. An opening is formed to expose the ground pattern formed in, and at least during the insertion of the card, the shortest distance from the ground contact portion to the opening is shorter than the shortest distance from the signal contact portion. It is characterized by

In the card connector device according to a second aspect of the present invention, the contact portions are arranged side by side in a direction orthogonal to the insertion direction of the card.
The contact portions located on both ends of the juxtaposed contact portions are the ground contact portions, and the openings correspond to the ground contact portions and extend from the insertion slot side to the back along the card insertion direction. It is characterized in that it is formed in a slender shape.

According to another aspect of the card connector device of the present invention, a metal cover that covers the card insertion portion and is connected to the ground pattern of the circuit board is provided, and the ground pattern is provided from the ground contact portion through the opening. Is shorter than the shortest distance from the signal contact portion to the cover.

The card connector device according to a fourth aspect of the present invention is characterized in that the ground pattern on the circuit board is formed in the entire area facing the bottom surface of the card insertion portion.

[0009]

According to the invention of claim 1, the shortest distance from the ground contact portion of the card to the opening, that is, the shortest distance from the ground contact portion to the ground pattern of the circuit board exposed through the opening. Since the distance is shorter than the shortest distance from the signal contact, even if the card is charged with static electricity when you insert the card, the static electricity is transferred from the ground contact to the ground pattern on the circuit board through the opening. It is easily discharged. Therefore, it is unlikely that a high voltage is generated in the signal line of the circuit in the card due to the discharge of static electricity, and the destruction of the circuit in the card can be prevented.

According to the second aspect of the present invention, the elongated openings are formed on the bottom surface of the card insertion portion so as to extend from the insertion opening side to the inside corresponding to the ground contact portions located on both ends of the card. While the card is being carried inward after being inserted into the insertion slot, static electricity charged on the card is easily discharged from the ground contact portion to the ground pattern through the opening. Therefore, it is possible to prevent the circuits and the like in the card from being destroyed by the electrostatic discharge.

According to the third aspect of the present invention, even when a metal cover for covering the card insertion portion is provided, it is exposed through the opening from the ground contact portion from the shortest distance from the signal contact portion to the cover. Since the shortest distance to the ground pattern on the circuit board is shorter, static electricity charged on the card is easily discharged from the ground contact part to the ground pattern on the circuit board through the opening, and the circuits inside the card are destroyed. Can be prevented.

According to the invention of claim 4, since the ground pattern can be formed in the entire area of the circuit board facing the bottom surface of the card insertion portion, radiation noise, external noise, bounce noise, etc. at the time of data transmission. The influence of can be reduced.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION <First Embodiment> A first embodiment of the card connector device according to the present invention will be described below with reference to FIGS.

First, a card mounted on the card connector device of this embodiment will be described. As shown in FIGS. 5, 7, and 8, the card 10 has a rectangular shape, and includes a resin-made case 11 and a circuit board (not shown) mounted with an IC or the like that constitutes a memory. To be done. Card 1
A plurality of contact portions 12 are arranged on the lower surface of the front end portion of 0. As shown in FIG. 7, the contact portions 12 located on the left and right ends of the contact portions 12 are the ground contact portions 12a. The contact portion 12 located in the center is the power source contact portion 12b, and the other contact portions 12 are the signal contact portions 12c.

As shown in FIGS. 1 to 4, the card connector device of the present embodiment comprises a resin housing 20 and a metal cover 22 which covers the housing 20.

In the housing 20, as shown in FIG.
A card insertion portion 21 into which the card 10 is inserted and a terminal 23 that comes into contact with a plurality of contact portions 12 of the card 10 are provided in the inner portion thereof. The card insertion portion 21 has a pair of guide portions 25, 25 arranged on both left and right sides so as to face each other, and a pair of openings 24, 24 described later are formed on the bottom surface between the guide portions 25. Further, in FIG. 4, a card insertion opening 21a is provided on the right side surface of the card insertion portion 21, and the inner wall surface of each guide portion 25 serves as guide surfaces 25a, 25a for guiding the card 10 to the insertion position. .

The pair of openings 24 are formed on the bottom surface of the card insertion portion 21 so as to face each other on the left and right sides and to extend in a slender manner from the front end portion (end portion on the card insertion opening 21a side) to the rear end portion. An inner edge portion of 24 (a right edge portion in the left opening portion 24, a left edge portion in the right opening portion 24) is an outer side of the ground contact portion 12a located on both left and right end sides of the card 10 being inserted. The edge portion (the left edge portion in the left ground contact portion 12a, the right edge portion in the right ground contact portion 12a) is formed at a position substantially the same as or outside the line extending downward. . That is, as shown in FIG. 10, in each opening 24, the shortest distance A1 from the ground contact portion 12a of the card 10 being inserted to the opening 24 is the shortest distance from the signal contact portion 12c to the opening 24. It is formed at a position shorter than A2.

Further, as shown in FIG. 8, the rear edge portion of each opening 24 has at least the ground contact portion 12a of the inserted card 10 until the ground contact portion 12a starts contacting with the ground terminal 23a. The shortest distance A1 from 12a to the opening 24 is shorter than the shortest distance A2 from the signal contact portion 12c to the opening 24.

As shown in FIG. 4, each terminal 23 is composed of an elongated elastic piece, and seven terminals are arranged side by side in a direction orthogonal to the card insertion direction with the tip end thereof protruding into the card insertion portion 21. Has been done. A contact point that contacts each contact section 12 of the card 10 is formed at the tip of each terminal 23, and the end opposite to the tip is from the rear end of the housing 20 (the left end in FIG. 4). It projects rearward and is soldered to the circuit pattern of the circuit board 30. Of each terminal 23,
The two terminals 23 located on the left and right ends (upper and lower ends in FIG. 4) are the ground terminals 23a, the center terminal 23 is the power supply terminal 23b, and the other terminals 23 are the signal terminals 23c. ing.

As shown in FIG. 3, the cover 22 is formed by bending a metal plate into a gate shape when viewed from the front.
The left and right side plates are disposed along the left and right outer side surfaces of the housing 20 while covering the upper surface of the housing 1. As shown in FIG. 1, of the lower edge portions of the left and right side plates, a total of four front and rear end portions (left and right end portions in FIG. 1) project at right angles along the mounting surface of the circuit board 30. The projecting portion 22a is the circuit board 3
It is designed to be soldered to a ground pattern 31 of No. 0 which will be described later. Further, the cover 22 has a rectangular opening 22b formed on the upper surface.

Next, the circuit board 30 on which the card connector device of this embodiment is mounted will be described. As shown in FIG. 6, a ground pattern 31 is formed on the surface of the circuit board 30. The ground pattern 31 is
It is formed in the entire region so as to surround the housing 20. That is, the ground pattern 31 has the openings 24.
It is exposed to the inside of the card insertion portion 21 through the. Further, the front edge portion (right side edge portion in FIG. 6) of the ground pattern slightly protrudes further forward than the front edge portion of the housing 20 when the card connector device of this embodiment is mounted. As shown in FIG. 9, the shortest distance B1 from the ground contact portion 12a of the card 10 in the insertion start state to the front edge portion of the ground pattern 31 is the shortest distance from the signal contact portion 112c to the front edge portion of the cover 22. It is shorter than B2.

Further, since the opening 22b is formed in the cover 22, the shortest distance A4 from the ground contact portion 12a of the card 10 being inserted to the ground pattern 31 through the opening 24 is the signal contact portion. It is shorter than the shortest distance A3 from 12c to the cover 22.

Next, the operation of this embodiment will be described. When the card 10 charged with static electricity or the operator charged with static electricity inserts the card 10, when the card 10 is brought closer to the card insertion opening 21a, the ground contact portion 12a of the card 10 leads to the front edge portion of the ground pattern 31. The shortest distance B1 from the signal contact portion 12c to the cover 2
Since it is shorter than the shortest distance B2 to the front edge portion of 2, the static electricity is difficult to be discharged from the signal contact portion 12c to the cover 22, and is discharged from the ground contact portion 12a to the cover 22 (see FIG. 9).

Then, the card 10 is inserted into the card insertion slot 21a.
And push it to the card insertion position. At this time, since the shortest distance A1 from the ground contact portion 12a of the card 10 being inserted to the opening 24 is always shorter than the shortest distance A2 from the signal contact portion 12c, static electricity not discharged in the above is used for the ground. From the contact portion 12a to the opening 2
4 to the ground pattern 31, and the signal contact portion 12c is not discharged to the ground pattern 31 (see FIG. 10).

Since the shortest distance A4 from the ground contact portion 12a of the card 10 being inserted to the ground pattern 31 via the opening 24 is shorter than the shortest distance A3 from the signal contact portion 12c to the cover 22, There is no discharge from the signal contact portion 12c to the cover 22 during insertion (see FIG. 10).

As described above, in the above-described embodiment, the front edge portion of the ground pattern 31 is projected forward from the front edge portion of the housing 20, and the ground pattern 31 extends from the ground contact portion 12a of the card 10 in the insertion start state. The shortest distance B1 to the front edge is measured from the signal contact portion 12c to the cover 2
Since the distance is shorter than the shortest distance B2 to the front edge of the card 2, static electricity charged on the card 10 at the start of card insertion is not easily discharged from the signal contact portion 12c to the cover 22. It is possible to prevent a high voltage from being generated on the line and destroying the IC in the card 10, stored data, or the like.

The opening 2 is formed on the bottom of the card insertion portion 21.
4, the shortest distance A1 from the ground contact portion 12a of the card 10 being inserted to the opening 24 is made shorter than the shortest distance A2 from the signal contact portion 12c, so that static electricity charged in the card 10 is inserted. Signal contact part 1 on the way
It is difficult for the 2c to be discharged to the ground pattern 31, and it is possible to prevent destruction of the IC or the stored data in the card 10.

Furthermore, since the shortest distance A4 from the ground contact portion 12a of the card 10 in the middle of insertion to the ground pattern 31 through the opening 24 is shorter than the shortest distance A3 from the signal contact portion 12c to the cover 22, Even if the cover 22 is provided, static electricity charged in the card 10 is unlikely to be discharged from the signal contact portion 12c to the cover 22 during insertion, and the IC in the card 10 or stored data is prevented from being destroyed. it can.

Further, since the ground pattern 31 is formed in the entire area facing the bottom surface of the card insertion portion 21, radiation noise, external noise, or bounce occurs when the card 10 is mounted and data is transmitted. It is possible to reduce the influence of noise and the like.

<Second Embodiment> A second embodiment of the card connector device according to the present invention will now be described with reference to FIG.
This will be described with reference to FIG. The same components as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

In the second embodiment, the opening 40 of the present invention is used.
Has a plurality of small holes 41 facing each other on the left and right sides and arranged side by side in two rows. The shortest distance from the ground contact portion 12a of the card 10 being inserted to each small hole 41 is shorter than the shortest distance from the signal contact portion 12c to each small hole 41.

As a result, in the second embodiment, in addition to the same effect as the first embodiment, the opening 40 is composed of a plurality of small holes 41, so that the card insertion portion 21 is formed rather than forming a long hole.
The rigidity of the bottom surface can be increased.

The present invention is not limited to the above-mentioned embodiments, but can be modified and implemented as follows, for example, and these embodiments also belong to the technical scope of the present invention. (1) In the above embodiment, the opening 22b is formed in the cover 22.
And the ground pattern 31 is formed through the opening 24 from the ground contact portion 12a of the card 10 being inserted.
The shortest distance A4 to the cover 22 is shorter than the shortest distance A3 from the signal contact portion 12c to the cover 22, but instead of the opening, a bulge portion, or from the ground contact portion of the card to the ground pattern through the opening portion. The ceiling surface of the cover may be arranged in a direction away from the bottom surface of the housing so that the shortest distance is shorter than the shortest distance from the signal contact portion to the cover.

(2) In the above embodiment, the ground pattern 31 is formed in the entire area facing the bottom surface of the card insertion portion 21, but at least in the area facing the opening formed in the bottom surface of the card insertion portion. It should have been done.

(3) In the above-described embodiment, the card 10 having the ground contact portions 12a on both end sides is mounted, but a card having the ground contact portions on one end side, or another type. A card having a ground contact portion at the position may be mounted. In addition, the present invention can be variously modified and implemented without departing from the scope of the invention.

[Brief description of drawings]

FIG. 1 is a top view showing an entire card connector device according to a first embodiment.

FIG. 2 is a side view showing the entire card connector device of the embodiment.

FIG. 3 is a front view showing the entire card connector device of the embodiment.

FIG. 4 is a top view showing a state in which the cover of the same embodiment is removed.

FIG. 5 is a plan view showing a positional relationship between the housing and the ground pattern of the same embodiment.

FIG. 6 is a plan view showing a ground pattern of the same embodiment.

FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 1 of the same embodiment.

FIG. 8 is a sectional view taken along line 8-8 in FIG. 1 of the same embodiment.

FIG. 9 is an enlarged cross-sectional view showing a card insertion start state of the same embodiment.

FIG. 10 is an enlarged cross-sectional view showing the positional relationship between the contact portion and the opening portion of the same embodiment.

FIG. 11 is a plan view showing a positional relationship between a housing and a ground pattern according to the second embodiment.

FIG. 12 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

10 cards 12 Contact part 12a Contact part for ground 12c Signal contact part 21 Card insertion part 21a Card insertion slot (insertion slot of the present invention) 22 cover 23 terminals 23a Ground terminal 23c Signal terminal 24 Opening Portion (Opening Portion of the Present Invention) 25 Guide 30 circuit board 31 grand pattern 40 Opening Portion (Opening Portion of the Present Invention)

Claims (4)

[Claims] 1. A card connector device mounted on a circuit board, comprising: a card insertion part into which a card is inserted; and a plurality of terminals that respectively come into contact with respective contact parts of the card inserted into the card insertion part. The contact portions each include at least a ground contact portion and a signal contact portion, and the card insertion portion includes a pair of resin guide portions that guide the insertion of the card, and between the pair of guide portions. An opening for exposing the ground pattern formed on the circuit board is formed on a bottom surface, and the shortest distance from the ground contact portion to the opening is at least during the insertion of the card from the signal contact portion. A connector device for a card, which is configured to be shorter than the shortest distance of. 2. The contact parts are arranged side by side in a direction orthogonal to the insertion direction of the card, and the contact parts located at both ends of the arranged contact parts are ground contact parts, 2. The card connector device according to claim 1, wherein the opening is formed in a slender shape from the insertion opening side to the inner side along the insertion direction of the card, corresponding to each of the ground contact portions. . 3. A metal cover that covers the card insertion portion and is connected to the ground pattern of the circuit board is provided, and the shortest distance from the ground contact portion to the ground pattern through the opening portion. 3. The card connector device according to claim 1, wherein the distance is shorter than the shortest distance from the signal contact portion to the cover. 4. The card connector device according to claim 1, wherein the ground pattern on the circuit board is formed in the entire area facing the bottom surface of the card insertion portion.