TWI412185B - Card-edge connector and assembly thereof - Google Patents

Abstract

The present invention relates to a card-edge connector for receiving a card. The card-edge connector includes an insulative housing and a plurality of conductive contacts received in the insulative housing. The insulative housing defines opposite front surface and rear surface. The insulative housing defines a pair of lengthwise walls, a central slot recessed from the front surface thereof and two rows of contact-receiving passages within the lengthwise walls. The contact-receiving passages communicate with the central slot. The insulative housing defines at least one heat-radiating slot recessed rearward from the front surface into the two lengthwise wall. Each conductive contact includes a retention portion interferentially received in the contact-receiving passage, a contacting portion partially extending into the central slot and a connecting portion extending beyond the rear surface of the insulative housing. With the arrangement of the heat-radiating slot, a heat generated from engagement of the card and the conductive contacts are radiated to the outside.

Description

Card edge connector and combination thereof

The present invention relates to a card edge connector and a combination thereof, and more particularly to a card edge connector for electrically connecting to a circuit board and a combination thereof.

Electrical connectors are widely used and can be divided into desktop computer electrical connectors, notebook computer electrical connectors, mobile phone electrical connectors, consumer electronic electrical connectors, and other applications. Card edge connectors are a common interface common to electrical connectors in a variety of devices. Referring to the first and second figures, the card edge connector 100' is usually fixedly mounted on a printed circuit board (not shown) and has an interface for receiving an electronic card or a card 200', so Signal transmission and power transmission. The card edge connector generally includes an insulative housing 1' and a plurality of conductive terminals 3' housed in the insulative housing 1'. The insulative housing 1' is provided with a central slot 10' and two rows of terminal receiving passages 11' located on the longitudinal side walls of the slot 10'. The conductive terminals 3' are respectively received in the terminal receiving passages 11' and partially protruded in the slots 10' to be electrically connected to the plurality of gold fingers 201' of the card 200'.

During the process in which the card 200' and the card edge connector 100' are matched to each other, i.e., in the process of matching the conductive terminals 3' with each other, a heat source is generated due to the influence of the conductor impedance. However, since the insulating body 1' has limited communication with the outside, the heat source is usually limited to the inside of the insulating body 1'. There is a safety hazard inside the insulating body 1' which is continuously affected by the high temperature. For example, in the region where the conductive terminal 3' and the gold finger 201' of the card 200' are in contact with each other, the conductor material may have carbon deposit, coke black, melting, elastic variation (elastic fatigue) and the like. The material of the insulating body 1' may also be deformed or gelatinized. Melting black, material variation and other phenomena occur. When applied to the system, the continuously accumulated contact heat may also cause problems such as malfunction of the card edge connector 100'.

In view of this, it is necessary to further improve the existing card edge connector to solve the above problems.

It is an object of the present invention to provide a card edge connector and a combination thereof that are excellent in heat dissipation and reliable in function.

In order to achieve the above object, the present invention relates to a card edge connector comprising: an insulative housing defining a plugging direction extending forward and backward, and an opposite end face and a rear end face, the insulative housing having two longitudinal side walls from the front end face a central slot formed in the insertion direction for receiving the card and a heat dissipation slot extending from the front end surface along the insertion direction, wherein the two longitudinal side walls are provided with a plurality of terminals connected to the central slot The receiving slot is formed by recessing at least one longitudinal side wall and communicating with the terminal receiving slot along the plugging direction; the plurality of conductive terminals are received in the terminal receiving slot, and the conductive terminal includes the foregoing insulating a holding portion that is fixed by the main body, abutting portion extending from the holding portion into the center slot, and a connecting portion extending from the holding portion to the insulating body.

As a further improvement of the present invention, the heat dissipation groove is a plurality of heat dissipation grooves formed by recessing upward and downward from the two longitudinal side walls, respectively.

As a further improvement of the present invention, the heat sink is respectively connected to the aforementioned terminal The slots are aligned in the plugging direction, and the heat sink is square or curved.

As a further improvement of the present invention, the heat sink is in communication with the central slot.

As a further improvement of the present invention, the insulating body has both end portions distributed along the extending direction of the longitudinal side wall, wherein the extending width of the heat dissipating groove is cut off at the both end portions.

As a further improvement of the present invention, the aforementioned central slot extends into the end portion of the end portion to form a stop portion for limiting the insertion depth of the card.

As a further improvement of the present invention, the two longitudinal side walls are respectively provided with a pair of ribs, and the ribs extend into the heat dissipating grooves and the distance between the ribs is equal to the height of the central slot.

According to a further improvement of the present invention, the insulating body has an additional heat dissipating groove communicating with the central slot at the longitudinal ends thereof, and the additional heat dissipating groove extends through at least one of the front end surface and the rear end surface.

According to a further improvement of the present invention, the terminal receiving groove has a contact receiving groove for receiving the conductive terminal abutting portion and a retaining portion receiving groove for receiving the conductive terminal retaining portion, and the insulating body is recessed from the front end surface in the insertion direction. The contact portion receiving groove is connected to the groove.

According to a further improvement of the present invention, the retaining portion receiving groove of the insulative housing communicates with the contact portion receiving groove and the central slot, respectively.

As a further improvement of the present invention, the foregoing conductive terminal further includes a free end extending from the butt portion to the foregoing slot, the insulating body including a support for the foregoing a support portion of the free end, the support portion being located between the slot and the heat sink.

As a further improvement of the present invention, the insulative housing further includes a heat dissipation through slot extending from the rear end surface, and the heat dissipation through slots are respectively located at two sides of the holding portion receiving groove and communicate with the contact portion receiving groove, wherein the heat dissipation through slot is further The central slots are connected.

The object of the present invention can also be achieved by the following technical solution: a card edge connector assembly comprising: a card edge connector comprising: an insulative body defining a front and rear extending insertion direction, and a front end surface and a rear end surface The insulative housing has two longitudinal side walls, a central slot formed by the front end surface recessed in the plugging direction for receiving the card, and the two longitudinal side walls are provided with a plurality of terminal receiving slots communicating with the central slot The plurality of conductive terminals are received in the terminal receiving groove, and the conductive terminal includes a holding portion that is fixed to the insulating body, an abutting portion that extends from the holding portion into the central slot, and extends from the holding portion a connecting portion of the insulative housing; the card includes a main body portion and a gold finger disposed on two sides of the main body portion; when the card is inserted into the central slot in the plugging direction, the mating portion of the gold finger and the conductive terminal is electrically connected Wherein, a heat dissipation groove communicating with the outside is formed between the gold finger and the two longitudinal side walls, and the gold finger and the conductive terminal are electrically connected to each other. Heat discharged via heat sinks, the heat sinks on at least one recess formed in the longitudinal side walls of the terminal receiving grooves communicating in the plug-in direction.

As a further improvement of the present invention, the heat dissipation groove is a plurality of heat dissipation grooves formed by recessing upward and downward from the two longitudinal side walls, respectively.

According to a further improvement of the present invention, the heat dissipation grooves are respectively aligned with the terminal receiving groove in the insertion direction, and the heat dissipation grooves are square or curved.

As a further improvement of the present invention, the heat sink is in communication with the central slot.

As a further improvement of the present invention, the insulating body has both end portions distributed along the extending direction of the longitudinal side wall, wherein the extending width of the heat dissipating groove is cut off at the both end portions.

As a further improvement of the present invention, the aforementioned central slot extends into the end portion of the end portion to form a stop portion for limiting the insertion depth of the card.

As a further improvement of the present invention, the two longitudinal side walls are respectively provided with a pair of ribs, and the ribs extend into the heat dissipating grooves and the distance between the ribs is equal to the height of the central slot.

According to a further improvement of the present invention, the insulating body has an additional heat dissipating groove communicating with the central slot at the longitudinal ends thereof, and the additional heat dissipating groove extends through at least one of the front end surface and the rear end surface.

According to a further improvement of the present invention, the terminal receiving groove has a contact receiving groove for receiving the conductive terminal abutting portion and a retaining portion receiving groove for receiving the conductive terminal retaining portion, and the insulating body is recessed from the front end surface in the insertion direction. The contact portion receiving groove is connected to the groove.

As a further improvement of the present invention, the heat source generated by the conductive terminal and the gold finger of the card is electrically connected by the additional heat sink and the slot, the contact receiving slot and the slot and card connected thereto Between the gold finger and the two longitudinal side walls The heat sink is finally discharged from the front end surface of the insulating body.

As a further improvement of the present invention, the heat source generated by electrically connecting the conductive terminal and the gold finger of the card is finally discharged from the rear end surface to the outside of the insulating body by the retaining portion receiving groove and the additional heat dissipating groove.

The effect of this creation is: by the arrangement of the heat sink, the heat source generated after the card and the conductive terminal are electrically connected is timely released, thereby improving the service life and the electrical transmission safety.

Referring to the third to seventh figures, a perspective view of the card edge connector 100 and the card 200 mated therewith according to the first embodiment of the present invention is disclosed. The card edge connector 100 includes an insulative housing 1 and two rows of conductive terminals 3 disposed in the insulative housing 1. The card 200 includes a main body portion 201 and a plurality of gold fingers 203 located on both sides of the main body portion. When the card 200 is engaged with the card edge connector 100, the conductive terminal 3 is electrically connected to the gold finger 203 to transmit a signal.

Referring to the fourth to eleventh drawings, the insulative housing 1 is a vertically long rectangular parallelepiped defining a plugging direction extending forward and backward and opposite the front end face 12 and the rear end face 16. The insulative housing 1 has two longitudinal side walls 103, and is recessed inwardly along the insertion direction to form a central slot 10 for receiving the card 200, a plurality of terminal receiving slots 11 on the two longitudinal side walls 103, and The front end surface 12 extends rearwardly to form a heat dissipation groove 101, and the heat dissipation groove 101 may be square or curved. The terminal receiving slot 11 includes a contact receiving slot 110 and a retaining portion receiving slot 112. The contact receiving slot 110 is located at the front of the insulative housing 1 and communicates with the central slot 10 and the front end surface 12, respectively. The retaining portion receiving slot 112 is located at the rear. Through the rear end face 16. solid The holding portion receiving groove 112, the contact portion receiving groove 110, and the center slot 10 communicate with each other. The heat dissipation groove 101 communicates with the contact portion accommodation groove 110 in the insertion direction.

The insulative housing 1 is recessed from the front end surface 12 in the insertion direction to form a slot 1101 communicating with the contact receiving groove 110. In addition, the insulative housing 1 further includes heat dissipation through slots 1121 and 1122 extending from the rear end surface 16 , and the heat dissipation through slots 1121 and 1122 are respectively located on both sides of the holding portion receiving groove 112 and communicate with the contact receiving groove 110 ; The heat dissipation through slot 1122 is also in communication with the central slot 10. The holding portion receiving groove 112 is wider than the heat dissipation through grooves 1121 and 1122. The insulative housing 1 further includes a support portion 105 supporting the conductive terminal 3 , and the support portion 105 is located between the slot 1101 and the heat dissipation slot 101 .

In addition, the insulative housing 1 is further provided with an additional heat dissipation groove 14 communicating with the central slot 10 at its both end portions 17. The additional heat dissipation groove 14 penetrates the front end surface 12 and the rear end surface 16 of the insulative housing 1. As shown in the sixth and seventh figures, the additional heat dissipation groove 14 penetrates the front end surface 12 of the insulative housing 1 through the slot 140.

Referring to the sixth embodiment, in the first embodiment, the conductive terminal 3 has a retaining portion 32 extending horizontally in the plugging direction, and the abutting portion 31 and the self-holding portion 32 formed by bending forward from the retaining portion 32. The connecting portion 33 is formed to extend horizontally rearward. A plurality of barbs 320 are formed on the left and right edges of the holding portion 32, respectively. The abutting portion 31 is inclined downward from the holding portion 32 and then bent upward to form an elastic pressing portion 310, and then a free end 312 is horizontally extended from the end of the elastic pressing portion 310.

When the conductive terminal 3 is received in the insulative housing 1 , the mating portion 31 is received in the contact portion receiving groove 110 , and the retaining portion 32 is received in the retaining portion receiving groove 112 . The connecting portion 33 extends beyond the rear end surface 16 of the insulative housing 1 for electrical connection with a mother board (not shown). The elastic pressing portion 310 of the abutting portion 31 of the conductive terminal 3 extends beyond the contact portion receiving groove 110 and enters the center slot 10. The free end 312 is located within the slot 1101 and is supported by the support portion 105. When the holding portion 32 is received in the holding portion receiving groove 112 , the barbs 320 on both sides of the holding portion 32 interfere with the side walls of the holding portion receiving groove 112 to hold the conductive terminal 3 in the insulating body 1 .

When the card 200 is inserted into the card edge connector 100 in the insertion direction, the card holder 100 is inserted into the central slot 10 and electrically connected to the elastic pressing portion 310 of the conductive terminal 3 to form a plug. The electrical connection between the card 200 and the card edge connector 100. Since the contact area of the gold finger 203 with the elastic pressing portion 310 generates a contact heat source (refer to FIGS. 8 to 10, which shows how the heat source is transferred from the insulating body 1 to the outside), the gold finger 203 is in contact with the conductive terminal 3. The heat source in front of the area is conducted to the outside through the heat sink 101, the additional heat sink 14 and the slot 140 and the slot 1101 communicating with the central slot 10. The heat source behind the contact area of the gold finger 203 and the conductive terminal 3 is conducted to the outside through the additional heat dissipation groove 14 and the heat dissipation through grooves 1121 and 1122 which communicate with the central slot 10.

In the first embodiment of the present invention, the additional heat dissipating groove 14 is penetrated through the front and rear end faces 12, 16. Of course, it may be only penetrated through the front end face 12 or the rear end face 14, but only through one of the end faces, it is not as good as the front and rear end faces 12, 14. The heat dissipation effect is good.

In this way, by the structure of the heat dissipation through grooves 1121 and 1122, it is ensured that the heat source generated after the card 200 and the card edge connector 100 are electrically connected can be exported out of the card edge connector 100 in time to enhance air convection, thereby reducing the insulation body 1 And golden hand Refers to the temperature of 203 and the conductive terminal 3, thereby improving safety and improving the service life.

Please refer to FIG. 11 and FIG. 12, which are card edge connectors 300 according to a second embodiment of the present invention. Compared with the card edge connector 100 of the first embodiment, the card edge connector 300 expands the center slot 10 in the upward and downward directions to form a heat dissipation slot 101' communicating with the center slot 10, and at both ends 17 Keep the original size of the central slot 10. Referring to the twelfth figure, the central slot 10 extends into the end portion of the end portion 17 to form a stop portion 170 for restricting the insertion depth of the card 200 for inserting the card 200 into the card edge connector 300. Therefore, when the card 200 enters the card edge connector 300 under the guidance of the central slot 10 at the both end portions 17, the heat dissipation slot 101' located above and below the central slot 10 after being blocked by the blocking portion 170 A gap is formed between the upper and lower surfaces of the card 200. Therefore, the heat source generated after the card 200 and the card edge connector 300 are turned on is discharged outward along the heat dissipation groove 101'.

Please refer to the thirteenth and fourteenth drawings, which are card edge connectors 400 in accordance with a third embodiment of the present invention. Compared with the card edge connector 300 of the second embodiment, the difference is that a pair of protruding strips 107 are formed in the middle of the opposite longitudinal side walls 103 of the insulative housing 1 toward the heat dissipating slot 101 ′, between the pair of ribs 107 The distance is the same as the height of the central slot 10, so that it can be guided when the card 200 is inserted. The rear portion of the pair of ribs 107 is also formed with a stopper portion 170, respectively, which together with the stopper portion 170 located in the end portion 17 limits the insertion depth of the card 200.

Referring to the fifteenth and sixteenth drawings, the card edge connector 500 according to the fourth embodiment of the present invention. Compared with the card edge connector 300 of the second embodiment, the difference is that the longitudinal side walls 103 are integrally recessed upwardly and downwardly to form a heat dissipating groove 101' communicating with the center slot 10. On the opposite longitudinal side wall 103 respectively Two pairs of ridges 107 are formed in the heat dissipating groove 101' so as to be spaced apart and the distance between each pair of ribs 107 is equal to the original height of the central slot 10. Therefore, when the card 200 is docked with the card edge connector 500, the card 200 is guided into the insulative housing 1 by the two pairs of ribs 107, and is blocked by the stopper portion 170 formed at the rear end edge of the rib 107. Therefore, a gap as the heat dissipation groove 101' is formed between the card 200 and the center slot 10, so that the heat source is radiated outward along the heat dissipation groove 101'.

It should be particularly noted that in the present embodiment, only the card edge connector is taken as an example, and any type of card edge connector is applicable to the principles disclosed in the present invention in practical applications. Equivalent variations to the present invention made by the teachings of the present invention should still be included in the scope of the present invention.

100, 100', 300, 400, 500‧‧‧ card edge connectors

1, 1'‧‧‧Insulated body

107‧‧‧ ribs

10, 10’‧‧‧Central Slots

101, 101'‧‧‧ heat sink

103‧‧‧ longitudinal side wall

105‧‧‧Support

11, 11'‧‧‧ terminal receiving slot

110‧‧‧Contact storage slot

1101, 140‧‧‧ slotting

112‧‧‧Retaining part storage slot

12‧‧‧ front end

16‧‧‧ rear end face

1121, 1122‧‧ ‧ heat dissipation slot

14‧‧‧Additional heat sink

17‧‧‧ End

170‧‧‧stops

200, 200’‧‧‧ card

201‧‧‧ Main body

203, 201’‧‧‧ Gold Fingers

3, 3'‧‧‧ conductive terminals

31‧‧‧Docking Department

310‧‧‧Resistance Department

32‧‧‧ Holding Department

312‧‧‧Free end

320‧‧‧ barbed

33‧‧‧Connecting Department

The first figure is a three-dimensional assembly diagram of a conventional card edge connector and a card; the second figure is a cross-sectional view of the first figure; the third figure is the unassembled card edge connector and the card of the first embodiment of the present invention. The fourth view is an assembled perspective view of the card edge connector and the card of the first embodiment of the present invention; the fifth figure is a three-dimensional assembly of the card edge connector of the first embodiment of the present invention and the card. The sixth drawing is a front enlarged view of the card edge connector of the first embodiment of the present invention; the seventh figure is a partial enlargement of the card edge connector of the first embodiment of the present creation. The eighth drawing is a cross-sectional view taken along the line VIII-VIII in the fourth drawing; the ninth drawing is a sectional view taken along the line IX-IX in the fourth drawing; the tenth drawing is a sectional view along the XX line in the fourth drawing. Figure 11 is a perspective view of the insulative body of the card edge connector of the second embodiment of the present invention; the twelfth figure is a cross-sectional view taken along the XII-XII direction in the eleventh figure; 3 is a perspective view of the insulative housing of the card edge connector of the third embodiment; FIG. 14 is a cross-sectional view taken along the XIV-XIV direction of the thirteenth embodiment; and the fifteenth figure is the card edge connector of the fourth embodiment of the present invention. A perspective view of the insulative body; a sixteenth view is a cross-sectional view taken along line XVI-XVI of the fifteenth figure.

100‧‧‧ card edge connector

1‧‧‧Insulating body

10‧‧‧Central slot

101‧‧‧heat sink

140‧‧‧ slotting

1101‧‧‧ slotting

200‧‧‧ card

201‧‧‧ Main body

203‧‧‧ Gold Finger

3‧‧‧Electrical terminals

12‧‧‧ front end

17‧‧‧ End

Claims (23)

A card edge connector comprising: an insulative housing defining a plugging direction extending forward and backward, and an opposite end face and a rear end face, wherein the insulative housing has two longitudinal side walls, and is recessed from the front end face along the plugging direction a central slot for receiving the card and a heat dissipation slot extending from the front end surface along the insertion direction, wherein the two longitudinal side walls are provided with a plurality of terminal receiving slots communicating with the central slot, and the heat sink is at least a longitudinal side wall is recessed and communicates with the terminal receiving groove along the insertion direction; the plurality of conductive terminals are received in the terminal receiving groove, and the conductive terminal includes a holding portion that is fixed to the insulating body, and The retaining portion extends into the abutting portion of the central slot and the connecting portion of the insulating body from the retaining portion. The card edge connector of claim 1, wherein the heat dissipation groove is a plurality of heat dissipation grooves formed by recessing upward and downward from the two longitudinal side walls, respectively. The card edge connector of claim 2, wherein the heat dissipation grooves are respectively aligned with the terminal receiving groove in the plugging direction, and the heat dissipation grooves are square or curved. The card edge connector of claim 1, wherein the heat sink is in communication with the central slot. The card edge connector of claim 4, wherein the foregoing insulation book The body has two end portions distributed along the extending direction of the longitudinal side wall, wherein the extending width of the heat dissipating groove is cut off at the both end portions. The card edge connector of claim 5, wherein the central slot extends into the end portion of the end portion to form a stop portion for limiting the insertion depth of the card. The card edge connector of claim 4, wherein the two longitudinal side walls are respectively provided with a pair of ribs, the ribs extending into the heat dissipation groove and the distance between the ridges is equal to the height of the central slot . The card edge connector of claim 1, wherein the insulating body has an additional heat dissipation groove communicating with the central slot at the longitudinal ends thereof, the additional heat dissipation groove extending through at least the front end surface and the foregoing One of the rear end faces. The card edge connector of claim 1, wherein the terminal receiving groove has a contact receiving groove for receiving the conductive terminal abutting portion and a retaining portion receiving groove for receiving the conductive terminal retaining portion, wherein the insulating body is from the front end surface A groove that communicates with the contact portion receiving groove is formed in the insertion direction. The card edge connector of claim 9, wherein the retaining portion receiving groove of the insulative housing communicates with the contact portion receiving groove and the central slot, respectively. The card edge connector of claim 9, wherein the conductive terminal further comprises a free end extending from the butt portion to the slot, the The edge body includes a support portion supporting the free end, and the support portion is located between the slot and the heat dissipation slot. The card edge connector of claim 9, wherein the insulative housing further includes a heat dissipation through groove extending from the rear end surface, and the heat dissipation through grooves are respectively located at two sides of the holding portion receiving groove and are received by the contact portion. The slots are connected, wherein the heat dissipation slots are also in communication with the central slot. A card edge connector assembly comprising: a card edge connector, comprising: an insulative housing defining a plugging direction extending forward and backward, and an opposite end face and a rear end face, the insulative body having two longitudinal side walls, from the front end face And a plurality of terminal receiving slots that are formed in the terminal receiving slots The conductive terminal includes a retaining portion that is fixed to the insulating body, an abutting portion that extends from the retaining portion into the central slot, and a connecting portion that extends from the retaining portion to the insulative housing; the card includes a main body portion And a gold finger disposed on two sides of the main body portion; when the card is inserted into the central slot in the plugging direction, the mating portion of the gold finger and the conductive terminal is electrically connected, wherein the gold finger and the two longitudinal side walls are formed a heat sink connected to the outside, the heat source generated by the gold finger and the conductive terminal being electrically connected is discharged through the heat sink, wherein the heat sink is at least The longitudinal The side wall is recessed, and communicates with the terminal receiving groove along the insertion direction. The card edge connector assembly of claim 13, wherein the heat dissipation groove is a plurality of heat dissipation grooves formed by recessing upward and downward from the two longitudinal side walls, respectively. The card edge connector assembly of claim 14, wherein the heat dissipation grooves are respectively aligned with the terminal receiving groove in the insertion direction, and the heat dissipation grooves are square or curved. The card edge connector assembly of claim 13, wherein the heat dissipation slot is in communication with the central slot. The card edge connector assembly of claim 13, wherein the insulative housing has two end portions distributed along a longitudinal wall extending direction, wherein the extending width of the heat dissipating groove is cut off at the both end portions. The card edge connector assembly of claim 17, wherein the central slot extends into the end portion of the end portion to form a stop portion for limiting the insertion depth of the card. The card edge connector assembly of claim 17, wherein the two longitudinal side walls are respectively provided with a pair of ribs, the ribs extending into the heat dissipation groove and the distance between the ridges and the height of the central slot equal. The card edge connector assembly of claim 17, wherein the insulating body has an additional heat dissipation groove communicating with the central slot at the longitudinal ends thereof, the additional heat dissipation groove extending through at least the front end surface and After the foregoing One of the end faces. The card edge connector assembly according to claim 20, wherein the terminal receiving groove has a contact portion receiving groove for receiving the conductive terminal abutting portion and a holding portion receiving groove for receiving the conductive terminal holding portion, wherein the insulating body is from the front end The surface is recessed in the insertion direction to form a groove that communicates with the contact portion receiving groove. The card edge connector assembly of claim 21, wherein the heat source generated by electrically connecting the conductive terminal and the gold finger of the card is accommodated by an additional heat sink and a slot and a contact portion thereof The slot and the slotted with it, the slot between the gold finger and the two longitudinal side walls are finally discharged from the front end surface. The card edge connector assembly of claim 20, wherein the heat source generated by the conductive terminal and the gold finger of the card is electrically insulated from the rear end surface by the retaining portion receiving groove and the additional heat sink. In vitro.