CN203521688U - Stitch structure that uses hollow slots to increase impedance - Google Patents

Abstract

The utility model relates to a pin structure for improving impedance value by using a hollow groove, which is used for connecting a circuit board and an expansion device, the pin structure comprises a plurality of metal terminals and a fixed seat body, and the two ends of the metal terminals can be respectively and electrically connected to the connection ports on the circuit board and the expansion device so as to transmit data; the fixing seat body is made of insulating materials and is fixedly arranged at the middle section part of the metal terminal, a preset gap can be kept between the metal terminals, a hollow groove is respectively arranged at the two sides of the fixing seat body corresponding to the positions of the metal terminals, so that the middle section part of the metal terminal can be contacted with the outside air, the low dielectric coefficient characteristic of the air is utilized, the impedance value of the fixing seat body is improved, and the fixing seat body can meet the USB3.0 specification. Thus, through the design of the hollow groove, the impedance value can be kept within the impedance range of the USB3.0 specification under the condition of reducing the whole occupied space of the pin structure.

Description

Stitch structure that uses hollow slots to increase impedance

technical field

The utility model relates to a pin structure which utilizes a hollow groove to increase the impedance value, especially refers to utilizing a fixed base body to position multiple metal terminals, and the position corresponding to the middle section of each metal terminal on the fixed base body is respectively provided with a hollow The pin structure of the groove can meet the specification of USB3.0 because the metal terminal can contact the outside air through the hollow groove to increase its resistance value.

Background technique

With the rapid development of microelectronic technology, various electronic devices have become one of the indispensable and important tools in people's life. Generally speaking, the circuit boards of various electronic devices today are mostly equipped with expansion and connection pins (also known as board-to-board connectors) to serve as bridges for power and data transmission between different circuit boards or external devices. However, With the improvement of the computing and signal transmission speed of the processor, the electrical characteristics and performance requirements of the pins also increase correspondingly, so as to meet the market demand.

Please refer to FIG. 1 , which is a schematic diagram of a pin structure 1. The pin structure 1 is composed of a plurality of metal terminals 11, and the metal terminals 11 are also integrated through an insulating base body 10. The metal One end of the terminal 11 can be electrically connected to a plurality of electrical contacts 120 on a circuit board 12 (such as: a motherboard), and the other end can be connected to an expansion device (not shown in the figure, it can be a network card, a display card, etc.) A connection socket 13 on the board is plugged together, so that the circuit board 12 can transmit signals to the expansion device through the pin structure 1 . However, with the popularity of various mobile electronic devices (such as notebook computers, tablet computers, smart phones, etc.) A high-density, multi-layered and thinned wiring layout can be realized on the printed circuit board. However, as mentioned above, since the pin structure 1 on the circuit board 12 must also take into account electrical specifications and impedance characteristics, it does not It is easy to reduce its size.

Take the most common Universal Serial Bus (USB) interface for data transmission as an example. In the past, the transmission speed of USB2.0 was about 60MB per second, but if the latest USB3.0 specification is used, the speed can Up to 500MB per second, almost ten times that of USB2.0, its future market potential is self-evident. However, because USB3.0 involves high-frequency signals in signal transmission, it also has specific restrictions on various media for transmitting signals. Taking the pins to be discussed in this utility model as an example, in order to comply with the transmission specification of USB3.0, In addition to the fact that each metal terminal must be able to withstand a current load of 1.5 amps, its impedance value must also be controlled between 78 and 105 ohms to ensure correct and stable data transmission. Generally speaking, the pin structure 1 shown in Figure 1, the cross-sectional configuration of its metal terminal 11 is a rectangle with a side length of 0.4 mm, and the distance between adjacent metal terminals 11 is 2.0 mm, because the metal terminal 11 must be loaded 1.5 amperes of current, so the size of the configuration of the metal terminal cannot be reduced (the creator found after actual testing that if the cross-sectional configuration of the metal terminal 11 is reduced to 0.3 mm, it will not be able to carry a current of 1.5 amperes), meaning That is, if the overall space occupied by the stitch structure 1 is to be reduced, it can only be started by the distance between the metal terminals 11 .

According to the USB3.0 specification, the impedance value of metal terminals must be between 78-105 ohms. If the distance between the metal terminals is changed rashly, it will inevitably affect its impedance characteristics in data transmission. Therefore, how to It can reduce the distance between the metal terminals without changing the configuration of the metal terminals, and at the same time take into account the impedance value, so that it can be successfully used to transmit the signals of the USB3. important issues to be addressed.

Utility model content

In view of the fact that it is difficult to reduce the space occupied by the existing pins, which makes it difficult for the industry to design thin and light electronic devices, the creator finally designed this utility model with years of practical experience and after many times of research and testing. A pin structure that utilizes hollow slots to increase the impedance value is expected to solve many shortcomings of existing pins.

One purpose of the present utility model is to provide a pin structure (internal header) that utilizes hollow grooves to increase the impedance value. The pin structure is applied in an electronic device (such as: a personal computer), and a circuit board (internal header) is provided in the electronic device. Such as: motherboard) and an expansion device (such as: network card, display card), the circuit board and the expansion device are respectively provided with a connection port (such as: socket, electrical contact); the pin structure includes a plurality of metal terminals and a The base body is fixed, and the configurations of the two ends of the metal terminal are respectively matched with the connection ports on the circuit board and the expansion equipment, so as to be electrically connected with each of the connection ports, so that data can be carried out between the circuit board and the expansion equipment. transmission; the fixing seat body is made of insulating material, and is fixed on the middle part of the metal terminal, so as to combine the metal terminals into one body, and maintain a predetermined gap between each metal terminal, the fixing seat The positions corresponding to the metal terminals on both sides of the body extend inward respectively to form a hollow groove, so that the middle section of the metal terminal can pass through the hollow groove and contact the outside air. In this way, the impedance value of the metal terminal can be increased through the low dielectric constant (Dielectric Constants) characteristic of the air, so that it complies with the USB3.0 specification.

Wherein, each of the hollow grooves can respectively form an opening on the surface of the fixing seat body, and the diameter of the opening is smaller than the depth of the hollow groove.

Wherein, the cross-sectional configuration of the hollow groove is a rectangle.

Wherein, the metal terminals can be further subdivided into multiple first terminals and multiple second terminals, the first terminals are arranged parallel to each other at a position adjacent to one side of the fixed seat body, and the second terminals are They are arranged parallel to each other at positions adjacent to the other side of the fixed seat body, so that one side of the middle section of the first terminal and the second terminal can respectively contact the air through the hollow grooves, and the other side can Can be covered by the fixed seat body.

Wherein, the predetermined gap between each of the metal terminals is between 1.2 mm and 0.8 mm.

Wherein, the cross-sectional configuration of each metal terminal is a rectangle whose side length is between 0.38mm and 0.42mm.

The beneficial effects of the utility model:

The utility model enables the middle section of the metal terminal to pass through the hollow groove to contact the outside air, and through the low dielectric coefficient characteristic of the air, the impedance value of the metal terminal is improved.

The utility model can increase the contact area between the metal terminal and the air by using the design of the hollow groove without changing the configuration of the metal terminal and the fixed seat body, so that the stitch structure can not only bear the current load of 1.5 amperes, but also Taking into account its overall structural strength and the limitation of impedance value in USB3.0.

The utility model can reduce the predetermined distance between the metal terminals to about 1.0 mm, so as to facilitate the lightness and thinning of the electronic device.

In order to facilitate your review committee to have a further understanding and understanding of the technical principle, structural features and purpose of the present utility model, the embodiment is hereby combined with the drawings, and the detailed description is as follows:

Description of drawings

FIG. 1 is a schematic diagram of an existing pin structure;

Fig. 2 is a three-dimensional schematic diagram of the pin structure of the present utility model; and

Fig. 3 is a schematic cross-sectional view of the pin structure of the present invention.

Description of main component symbols

[existing]

Pin structure 1

Insulation seat body 10

Metal terminal 11

circuit board 12

Electrical contacts 120

Connection socket 13

[this utility model]

Pin structure 2

Metal terminal 21

First terminal 211

Second terminal 212

Fixed seat body 22

Hollow slot 220

Hole 221

Scheduled Clearance D1

Depth D2

Caliber D3

Spacing D4

Detailed ways

The utility model is a pin structure which uses a hollow groove to increase the impedance value, and can reduce the gap between each metal terminal from 2.0mm to 1.0mm, so as to realize the miniaturization of the electronic device. Although there are connectors with a gap of 1.0mm, such connectors cannot meet the characteristic requirements of high-frequency signal transmission, so they cannot be applied to the data transmission of the USB3.0 specification. According to the USB3.0 specification, During data transmission, the pins must not be able to withstand a current of 1.5 amperes, and their impedance value must be between 78 ohms and 105 ohms.

Please refer to Figure 2, which is the first preferred embodiment of the present utility model. The pin structure 2 is applied to an electronic device, which can be a personal computer, a tablet computer or even a smart phone, and there is a A circuit board (such as a main board) and an expansion device (such as a display card, a network card, etc.). The circuit board and the expansion device are respectively provided with a connection port for receiving data transmitted from the outside. It is particularly mentioned here that the connection port can be a general electrical contact or a connection socket. The connection port (ie, the electrical contact 120 and the connection socket 13 ) is not drawn and marked separately in FIG. 2 , but the pin structure 2 is emphasized.

Please refer to Fig. 2 and Fig. 3, the pin structure 2 includes a plurality of metal terminals 21 and a fixed seat body 22, and the configurations of the two ends of the metal terminals 21 are matched with each of the connection ports, so as to be electrically connected to all on the connection port, so that the circuit board can transmit data with the expansion device through the metal terminal 21; assembly or injection molding process), so that the metal terminals 21 can be combined into one body, and can be separated from each other by a predetermined gap D1. A hollow groove 220 is provided on the two corresponding side surfaces of the fixed seat body 22 corresponding to the positions of the metal terminals 21. The setting direction of the hollow groove 220 is perpendicular to the setting direction of the metal terminal 21, and one end can Two sides of the fixing base 22 respectively form a rectangular opening 221 , the other end of which can be connected to the middle portion of the metal terminal 21 , so that the outside air can directly contact the metal terminal 21 .

Check, the dielectric constant, also known as the permittivity, is defined as a relative value of the amount of induced charge generated by a dielectric when an external electric field is applied. According to the calculation formula of capacitance: "capacitance = (dielectric Electricity coefficient×capacitance area)÷capacitor spacing” and the impedance formula of the capacitor “resistance=1÷(2×π×transmission frequency×capacitance)”, we can see that since the dielectric coefficient of air is close to 1, it belongs to low dielectric coefficient. Therefore, the air in the hollow groove 220 will have a certain resistance, so that the resistance value of the metal terminal 21 can also increase jointly after being in contact with the air.

As can be seen from the foregoing, although the size of the configuration of the metal terminal 21 cannot be reduced (only capable of withstanding a current of 1.5 amperes), and the fixing base body 22 is used to support the metal terminal 21 and cannot be easily adjusted, but through this The design of the hollow groove 220 of the utility model can still create the contact part between the air and the metal terminal 21 under the strict restrictions of the above two conditions, so as to improve the low dielectric coefficient of the air through the air. The resistance value of the metal terminals, in this way, the industry can reduce the predetermined gap D1 between the metal terminals 21, so as to improve the occupied space required by the pin structure 2, so that the electronic device can be designed to be lighter and more compact configuration, and thus meet the needs of the current market.

In the first preferred embodiment of the present utility model, the predetermined gap D1 is 1.0 mm, which is fully reduced by a factor of 2.0 mm at present, but in practice, the predetermined gap D1 can still be adjusted according to the needs of the industry Adjustment, and considering possible errors in the manufacturing process, the reasonable range of the predetermined gap D1 is about 1.2-0.8 mm, and the cross-sectional configuration of the metal terminal 21 is a rectangle with a side length of 0.38-0.42 mm. After the pin structure of the present utility model uses high-frequency simulation software to simulate the electrical characteristics of a signal passing through the metal terminal 21, it is confirmed that the pin structure 2 of the present utility model can indeed meet the impedance of USB3.0 on high-frequency transmission Requirements, that is, the impedance value is between 78 and 105 ohms.

In addition, please refer to FIG. 3 again. In the first preferred embodiment of the present invention, the cross-sectional configuration of the hollow groove 220 is a rectangular hole, and the depth D2 of the hollow groove 220 is greater than that of the opening 221. Caliber D3. In addition, in this embodiment, the metal terminals 21 can be subdivided into multiple first terminals 211 and multiple second terminals 212, and the first terminals 211 are arranged in parallel with each other in the fixed seat body 22 adjacent to each other. The position on one side, the second terminals 212 are arranged parallel to each other in the position adjacent to the other side of the fixed seat body 22, and the first terminal 211 and the second terminal 212 pass through the fixed seat body 22 A distance D4 is maintained, that is, one side of the middle section of the first terminal 211 and the second terminal 212 can pass through the hollow groove 220 to contact the outside air, and the other side can be covered by the fixed seat body. 22 covered.

Also, in the foregoing embodiments, the configurations of the metal terminals 21 are bent L-shaped, but the metal terminals 21 may not be bent, that is, the configurations of the metal terminals 21 are not 2 and 3, the metal terminal 21 is used as a data transmission bridge between the circuit board and the expansion device, so its configuration can be adjusted according to the configuration in the electronic device. It is not a necessary condition limitation of the present utility model.

The above is only a preferred embodiment of the present utility model, but the technical features of the present utility model are not limited thereto, and those in the relevant technical field can easily think And the equivalent changes, all should not depart from the protection category of the present utility model.

Claims (6)

1. a pin structure of utilizing hollow groove to promote resistance value, be to be applied in an electronic installation, in this electronic installation, be provided with a circuit board and an extension facility, on this circuit board and extension facility, be respectively equipped with a connectivity port, it is characterized in that, this pin structure comprises:

Branched metal terminal, the configuration at its two ends respectively with this circuit board and extension facility on a connectivity port match, can be to be respectively electrically connected mutually with this connectivity port respectively, make can carry out transfer of data between this circuit board and extension facility; And

One fixed base frame, to be formed by insulating material, and be fixedly arranged on the center section part of described metal terminal, so that described metal terminal is combined into one, and make respectively between this metal terminal, to maintain respectively a predetermined gap, extend respectively inwardly position corresponding to described metal terminal on the both sides of this fixed base frame, to form respectively a hollow groove, make the center section part of described metal terminal can see through described hollow groove, contact extraneous air, and by the low-k characteristic of air, promote the resistance value of described metal terminal.

2. pin structure as claimed in claim 1, is characterized in that, respectively this hollow groove can form respectively at the surface of this fixed base frame a perforate, and the bore of this perforate is less than the degree of depth of this hollow groove.

3. pin structure as claimed in claim 2, is characterized in that, the cross sectional configurations of this hollow groove is a rectangle.

4. the pin structure as described in claim 1,2 or 3, it is characterized in that, described metal terminal can also be subdivided into branched the first terminal and branched the second terminal, described the first terminal is located at the position of a side of contiguous this fixed base frame in parallel to each other, described the second terminal is located at the position of the opposite side of contiguous this fixed base frame in parallel to each other, make a side of the center section part of described the first terminal and the second terminal can be respectively see through respectively this hollow groove and contact to air, its another side can be coated by this fixed base frame.

5. pin structure as claimed in claim 4, is characterized in that, respectively the predetermined gap between this metal terminal is between 1.2～0.8 millimeters.

6. pin structure as claimed in claim 5, is characterized in that, respectively the cross sectional configurations of this metal terminal is the length of side between the rectangle of 0.38～0.42 millimeter.

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