JP2005108881A - Electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the conventional problem wherein an electronic apparatus is not easily fixed to the substrate of a shield case and is not easily connected to the shield case of a connector provided on the substrate. <P>SOLUTION: The electronic apparatus comprises a shield case 2, having rectangular parallelepiped outline, a plurality of support parts 25 and 26 formed in the case 2, a main substrate 6 supported in the shielding case 2 by the plurality of support parts 25 and 26, a 10BASE-T jack 9 arranged on one end side on the main substrate 6, and a contact member 10 formed on the jack 9 and connected electrically therewith and brought into contact with the shielding case 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to an electronic device such as a cable modem device.

In recent years, cable modem devices have achieved higher cost integration and higher performance of components, and advanced mounting technology, which has led to significant cost reductions and downsizing. Under such circumstances, it has become possible to find the merit of cost and function by incorporating the cable modem device in the apparatus main body.

  However, since the shape and size of a conventional cable modem device is determined on the assumption that it is placed near a personal computer (hereinafter referred to as a PC) or hung on a wall, a certain size is required. And had a decent weight. Therefore, the method of fixing the circuit board inside the cable modem device is also generally fixed with screws in order to fix it stably, and it has not been considered until the miniaturization suitable for incorporation in the device main body. . For example, Patent Document 1 discloses an invention related to a shield structure for a casing of a general electronic device, but here, the substrate is attached to the casing with screws.

  In addition to the above, the RF coaxial connector and the 10BASE-T jack (hereinafter referred to as 10BASE-T jack) conforming to the IEEE 802.3 standard are arranged on the same surface, generally on the back side of the cable modem device. With this arrangement, the RF coaxial connector can be passed through the insertion hole of the metal shield plate or metal shield case, and at the same time, the 10BASE-T jack can be passed through the insertion hole of the metal shield plate or metal shield case.

However, when the cable modem device is built in the device main body, it may not always be appropriate to arrange the RF coaxial connector and the 10BASE-T jack on the same surface. It may not be possible to pass through the insertion hole of the metal shield plate or metal shield case. In such a case, it is necessary to bring the metal shield plate or metal shield case and the contact piece provided on the 10BASE-T jack into contact with the metal shield plate or metal shield case with an appropriate force. The contact piece is provided to bring the 10BASE-T jack into contact with the metal shield case in order to prevent external noise from being superimposed on communication conforming to the IEEE 802.3 standard.
Japanese Patent Laid-Open No. 10-233591 (pages 2 to 3, FIG. 3)

As described above, in the conventional electronic device, it is not easy to attach the board to the shield case, and it is not easy to connect the connector provided on the board to the shield case.
The present invention has been made in order to solve the above-described problem. Even when the size is reduced, the circuit board can be easily attached to the shield case, and the connector arranged on the board can be used as the shield case. An object is to provide an electronic device that can be reliably contacted. In this specification, the term “connector” including jacks is used.

In order to achieve the above object, an electronic device according to a first aspect includes a shield case having a rectangular parallelepiped shape, a plurality of support portions formed inside the case, and a plurality of support portions in the shield case. A board supported on the board, and a connector disposed at an end of the board,
A contact member formed on the connector and electrically connected to the connector and contacting the shield cover is provided.

  An electronic device according to a second aspect is the electronic device according to the first aspect, wherein a connector of a type different from the connector is disposed on the board at an end different from the end where the connector is disposed. It is characterized by that.

  Furthermore, the electronic device according to claim 3 is a shield case having a rectangular parallelepiped outer shape and having a notch, a plurality of support portions formed inside the shield case, and the shield case by the plurality of support portions. A board supported inside, a connector disposed on one end side of the board and exposed from the shield case through a notch in the shield case, and formed on the connector and electrically connected to the connector And a contact member that contacts the shield case at the cutout portion.

  An electronic device according to a fourth aspect is the electronic device according to the first to third aspects, wherein the support member is formed by projecting a part of the shield case to the inside of the shield case. It is.

  The electronic device according to claim 5 is the electronic device according to any one of claims 1 to 3, wherein the shield case includes a frame-shaped member and lid-shaped members disposed on both opening sides of the frame-shaped member, The substrate is supported by the frame member.

  According to the present invention, it is possible to provide an electronic device that can be easily attached to a circuit board to a shield case even when downsizing, and that a connector arranged on the board can reliably contact the shield case. Can do.

Embodiments of an electronic apparatus according to the present invention will be described below with reference to the drawings.
FIG. 1 is a partially omitted exploded perspective view showing an embodiment of an electronic apparatus according to the present invention, and takes up a cable modem device as an example of the electronic apparatus.

  In the figure, reference numeral 1 denotes an entire cable modem device. This device 1 is a frame-like member 3 constituting a shield case 2, and an upper lid-like member 4 and a lower lid-like member 5 constituting a shield case 2 together with the frame-like member 3. And a main board 6 provided in the cable modem device 1 and mounted with a cable modem function. The substrate 6 is provided with a tuner unit 7 for processing a high-frequency signal for connection to a CATV main line, and RF coaxial connectors 8 and 10BASE-T jacks 9 provided in the tuner unit 7. Further, the 10BASE-T jack 9 has a shield (not shown) of the ground (GND) of the cable modem device 1, that is, a shield case 2 and a 10BASE-T cable (hereinafter referred to as a 10BASE-T cable) conforming to the IEEE 802.3 standard. 10), a contact piece 10 is provided for improving electrical contact with the 10BASE-T jack 9 through the 10BASE-T jack 9.

From the above, two openings of the frame-like member 3 to which the main board 6 is attached (details will be described later on the attachment of the board 6 to the member 3) are covered with the upper lid-like member 4 and the lower lid-like member 5. The cable modem device 1 is configured. That is, the shield case 2 has the inner surface 4 of the frame-shaped member 3 in contact with the outer peripheral portion of the main substrate 6, and the upper cover-shaped member 4 and the lower cover-shaped member 5 are used as covers in the vertical direction of the main substrate 6 in the figure. 3 is attached to the main board 6 while being easily attached and detached, so that the entire main board 6 (six faces) is covered. As a result, the main board 6 is housed in the shield case 2 formed of a material effective in shielding electromagnetic waves such as metal and unwanted radiation.

  Next, the frame-shaped member 3 in the shield case 2 will be described in detail. One of the four surfaces of the frame-like member 3 is provided with a terminal group 21 for electrical connection for supplying communication and power, and one end of the terminal group 21 is connected to the main board 6. It is inserted into the terminal hole group 22 formed above, and is connected to a printed wiring (not shown) on the main board 6 by soldering. Further, in order to avoid the RF coaxial connector 8 and the 10BASE-T jack 9 that protrude to the outside when the main board 6 is inserted, notches 23 and 24 are formed, respectively.

  Furthermore, a plurality of two types of support portions 25 and 26 for supporting the main substrate 6 when the main substrate 6 is inserted into the shield case 2 (the frame member 3) are provided on the four inner surfaces of the frame member 3. Is formed. These support portions 25 and 26 are formed by making a cut in the frame-shaped member 3 and projecting a part of the member 3 to the inside. This state is shown in FIG. In the drawing, support portions 25 and 26 are formed from the frame-shaped member 3 toward the inside thereof, and the main substrate 6 indicated by a dotted line is supported by these support portions.

  Next, a method for assembling the cable modem device will be described with reference to FIGS. FIGS. 3 and 4 are a cross-sectional view and a side view of a main part for explaining a method of assembling the cable modem device 1. The support 26 protrudes from the inner surface of the frame-like member 3 of the shield case 2 before the main board 6 is inserted as shown in FIG. 2, but the main board 6 is attached to the shield case 2 as shown in FIG. When inserting along the inner surface of the frame-shaped member 3 from the opening (downward in the drawing) of the frame-shaped member 3 (see FIG. 4A), it returns to the surface of the frame-shaped member 3 by elasticity, and FIG. 4B, after the main board 6 has been inserted as shown in FIG. 4B, it projects again to the inner surface of the frame-like member 3 of the shield case 2. As a result, the main board 6 is supported and fixed so that the thickness direction is sandwiched between the support portions 25 and 26 of the frame-like member 3 of the shield case 2.

  Further, as shown in FIG. 4B, with the main substrate 6 supported and fixed, the 10BASE-T jack 9 is inserted into the notch 24 and at the same time, the notch 24 has an appropriate pressure applied to the contact piece 10. The dimensions are such that the case 2 can be touched while holding the Although not described in detail, the RF coaxial connector 8 is inserted into the notch 23.

  With the above-described structure, the RF coaxial connector 8 and the 10BASE-T jack 9 can be provided on different surfaces of the shield case 2. In addition, since the contact between the shield case 2 and the 10BASE-T jack 9 becomes good, the shield performance of the 10BASE-T cable becomes better, and from the unwanted radiation such as electromagnetic waves to the signal in the 10BASE-T cable. Interference can be reduced.

Further, by replacing the main board 6 generally fixed with screws with fixing by the support portions 25 and 26 of the shield case 2, no screws are required. Furthermore, by making the protruding method of the support portion 26 when fixing the main substrate 6 a simple method, the main substrate 6 can be fixed in a shorter time than the method of tightening by turning a plurality of screws.
With these effects, it is possible to provide a low-cost cable modem device capable of high-quality communication conforming to the IEEE 802.3 standard.

  Finally, the circuit of the cable modem device described above will be briefly described. FIG. 5 is a circuit block diagram for explaining an example of the circuit configuration of the cable modem apparatus shown in FIG.

The cable modem device 101 controls communication with the CATV center station 102, generates an uplink transmission signal to be transmitted to the center station 102, demodulates a downlink reception signal transmitted from the center station 102, and connects to the cable modem device 101. It has functions such as control of data communication with the external device 103 and a power source. That is, the cable modem device 101 includes a tuner unit 104 that handles a high-frequency signal for transmitting and receiving signals to and from the CATV center station 102. Also, the A / D converter unit 105 that converts the downlink reception signal that is frequency-converted and output from the tuner unit 104 into a digital signal, the demodulation unit 106 that demodulates and converts the downlink reception signal converted into the digital signal into data, In addition, a MAC (Media Access Control) unit 107 to which a downlink received signal is input is provided.

  Further, the cable modem device 101 includes a D / A converter unit 108 that converts the digital upstream transmission signal generated and output by the MAC unit 107 into an analog signal. The upstream transmission signal converted into an analog signal by the D / A converter unit 108 is supplied to the tuner unit 104 and transmitted to the CATV center station 102.

  The MAC unit 107 has a function of communicating data transmitted / received to / from the CATV center station 102 with an external device 103 connected to the cable modem device 101. An interface unit (I / F) 109 conforming to the IEEE 802.3 standard is connected to the downstream data input / output terminal of the MAC unit 107, and the downstream data input / output terminal of the interface unit 109 is connected to the external device 110. linked. At the data input / output terminal, the signal is converted into a standard format such as IEEE802.3.

  Reference numeral 111 denotes a microcomputer that controls the operation of the cable modem apparatus 101, and 112 denotes a memory, each of which is connected to the MAC unit 107. Reference numeral 113 denotes a power source.

As described above, data communication with the external device 103 can be performed using the communication function of the interface unit 109.
In the embodiment described above, the 10BASE-T jack and the RF coaxial connector are taken up as the connectors. However, it goes without saying that the present invention can be applied to other connectors such as a USB connector.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially exploded exploded perspective view for explaining a cable modem device which is an embodiment of an electronic apparatus according to the present invention. The principal part enlarged view for demonstrating the support part of the apparatus of FIG. The principal part enlarged view for demonstrating operation | movement of the support part of the apparatus of FIG. The figure for demonstrating the relationship between 10BASE-T jack and the shield case in the apparatus of FIG. The block diagram for demonstrating an example of the circuit structure of the cable modem apparatus of FIG.

Explanation of symbols

1: Cable modem device 2: Shield case 3: Frame member 4: Upper lid member 5: Lower lid member 6: Main board 8: RF coaxial connector 9: 10BASE-T jack 10: Contact pieces 23, 24: Cut Notch portions 25 and 26: support portions

Claims (5)

  A shield case having a rectangular parallelepiped shape, a plurality of support portions formed inside the case, a substrate supported in the shield case by the plurality of support portions, and an end portion on the substrate An electronic apparatus comprising: a connector; and a contact member formed on the connector and electrically connected to the connector, the contact member contacting the shield cover.   The electronic device according to claim 1, wherein a connector of a type different from the connector is disposed on an end portion different from the end portion on which the connector is disposed on the substrate.   A shield case having a rectangular parallelepiped outer shape and having a notch, a plurality of support portions formed inside the shield case, a substrate supported in the shield case by the plurality of support portions, and the substrate A connector disposed at one end of the shield case and exposed from the shield case through a cutout portion of the shield case, and formed at the connector and electrically connected to the connector, and at the shield case and the cutout portion. An electronic device comprising a contact member that contacts the electronic device.   4. The electronic device according to claim 1, wherein the support member is formed by projecting a part of the shield case to the inside of the shield case. 4. The electronic device according to claim 1, wherein the shield case includes a frame-shaped member and lid-shaped members disposed on both opening sides of the frame-shaped member, and the substrate is supported by the frame-shaped member. An electronic device characterized by being made.

Images