JP2009231546A - Electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shield a line noise filter while preventing an increase of the number of components. <P>SOLUTION: A circuit board 30 is arranged in a body case 3. In the circuit board 30, a power source connector 31, a line noise filter 32, and a filter capacitor 33 are mounted. An inserting part 31a of the power source connecter 31 is engaged to a connector opening 25a formed at a back surface plate 25 of the body case 3. A shield case 45 covers and shields a main body 31c of the power source connector 31, the line noise filter 32, and the filter capacitor 33. When a screw 39 is screwed to and engaged with a screw hole 45f to fix a fixed part 45c to the back surface plate 25, a pushing part 45b pushes a flange 31b to an inner surface of the back surface plate 25. The power source connector 31 is held between the shield case 45 and the inner surface of the back surface plate 25. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electronic device having a power connector and a line noise filter.

  In an electronic device such as a CD player (compact disc player), a disc device and a circuit board are accommodated in a main body case. The circuit board is provided with a control circuit for the disk device, an audio reproduction circuit, and the like. Further, a power connector to which a power line is connected is attached to the circuit board, and the CD player is supplied from a commercial power source through the power line. A part of the power connector is inserted into an opening formed on the back surface of the main body case.

  The power supply connector is fixed to the inner surface of the main body case by a fixing plate so that the plug attached to one end of the power supply line does not fall out of the main body case when the plug is pushed into the power supply connector.

  When fixing the power connector to the main body case, in Patent Document 1, a bush with a cable sandwiched is inserted into the insertion hole of the main body case, and the outer periphery of the bush is fixed to the main body case with a lock metal fitting. It is fixed to the main body case with screws so as not to move. In Patent Document 2, a fixed auxiliary plate is inserted into a groove formed in the cord bush, and the fixed auxiliary plate is fixed to the main body case with a screw.

When a power line is connected to the power connector, power noise enters through the power line. Since the audio signal is delicately affected by the power supply noise during CD reproduction, the circuit board is provided with a line noise filter for removing the power supply noise.
JP-A-8-205367 Japanese Utility Model Publication No. 6-009327

  The circuit board is provided with a capacitor, which may emit noise. When this noise enters the line noise filter or the power connector, the noise is sent to the commercial power supply via the power line. This problem can be solved by covering and shielding the line noise filter with a shield case. However, when a shield case is used, the shield case must be fixed to the main body case in the vicinity of the power connector, and it is difficult to secure a space for this fixation. Further, when both the shield case and the power supply connector are fixed to the main body case, there is a problem that the number of parts increases and the cost increases.

  SUMMARY An advantage of some aspects of the invention is to provide an electronic device capable of shielding a line noise filter while preventing an increase in the number of components.

  In order to achieve the above object, an electronic device according to the present invention includes a main body case for housing a circuit board, a power connector attached on the circuit board, and formed in the main body case, in front of the power connector. An opening that exposes a portion from the main body case to allow connection to a power line, and a line noise filter that is disposed in the vicinity of the power connector on the circuit board and removes power noise that enters through the power line And a shield case that covers and shields the line noise filter and holds the power connector by sandwiching a flange of the power connector between the main body case and the shield case. And fixing means. Note that examples of the electronic apparatus of the present invention include a CD player, a DVD player, a disk drive, an amplifier, and a converter.

  Moreover, it is preferable that the said shield case is provided with the shield part which covers the said line noise filter, and the pressing part which presses the said flange against the inner surface of the said main body case.

  Furthermore, it is preferable that the rear portion of the flange of the power connector is covered with the shield case.

  Further, it is preferable that a filter capacitor is disposed on the circuit board in the vicinity of the line noise filter, and the filter capacitor is covered with the shield case.

  Furthermore, it is preferable that the fixing means is a screw screwed to the shield case from the outside of the main body case.

  The shield case is preferably formed with a wire insertion hole through which a ground wire attached to the power connector is inserted.

  Furthermore, it is preferable that at least one protrusion is formed on the shield case, and only the protrusion is in contact with the circuit board.

  According to the present invention, since the line noise filter is covered with the shield case, it is possible to prevent noise from leaking outside through the power supply line. Also, instead of fixing the power connector to the main body case, the shield case is fixed to the main body case, and the power connector is held between the shield case and the main body case, so that the increase in the number of parts can be prevented. At the same time, a space for mounting the shield case can be easily secured. Further, since the power connector is also fixed at the same time by fixing the shield case, the mounting work is facilitated.

  As shown in FIGS. 1 and 2, the CD player 2 has a disk device 4 stored in a main body case 3. The disk device 4 includes a spindle motor 6 that rotates the CD 5, a pickup head 7 that reproduces data from the CD 5, and a pickup base 8. A turntable 9 on which a CD 5 is mounted is fixed to the drive shaft of the spindle motor 6. The turntable 9 is provided with a chucking head 10 and is inserted into the disc hole 5a of the CD5. Since the chucking head 10 inserted into the disc hole 5a is adsorbed by a clamper (not shown) provided inside the main body case 3, the CD5 is sandwiched between the turntable 9 and the clamper. .

  The pickup head 7 incorporates a laser light source (not shown) that emits laser light and an objective lens 12 that condenses the laser light on the recording surface of the CD 5. The pickup head 7 is movably held by a holding shaft 13 attached to the pickup base 8. The pickup head 7 is moved in the A direction that is the radial direction of the CD 5 by a known moving mechanism having a motor, a gear, and the like.

  A disc tray 15 is attached to the main body case 3 so that it can be pulled out. As shown in FIG. 1, the disc tray 15 moves between a storage position stored inside the main body case 3 during reproduction of the CD 5 and a pull-out position pulled out from the main body case 3 as shown in FIG. . The disk tray 15 is moved by a known tray moving mechanism having a motor, gears, and the like.

  The main body case 3 includes a base 21, a front exterior panel 22, and a side exterior panel 23. The base 21 includes a lower surface plate 24 and a rear surface plate 25 that cover the lower surface and the rear surface of the disk device 4. The front exterior panel 22 is fixed to the base 21 and covers the front surface of the disk device 4. The side surface exterior panel 23 is formed in a substantially U-shape integrated with the top surface exterior panel, and covers the left and right side surfaces and the top surface of the disk device 4. The side exterior panel 23 and the top exterior panel may be separated and individually formed and assembled.

  The front exterior panel 22 is provided with various operation buttons such as a power button 26, an open / close button 27 for opening / closing the disc tray 15, a play button 28, and a stop button 29.

  As shown in FIG. 3, a circuit board 30 is arranged inside the main body case 3. The circuit board 30 is provided with a control circuit for the disk device 4, an audio signal reproduction circuit, and the like. In FIG. 3, for convenience, a power connector 31, a line noise filter 32, a filter capacitor 33 connected to the line noise filter 32, a CPU 34, and a capacitor 35 are illustrated. The filter capacitor 33 is a capacitor for absorbing line noise together with the line noise filter 32, and one filter capacitor 33 is attached before and after the line noise filter 32.

  A power plug 37 attached to one end of the power line 36 is connected to the power connector 31. The other end of the power line 36 is connected to a commercial power source.

  The power connector 31 includes an insertion portion 31a, a flange 31b, and a main body portion 31c. A power plug 37 of the power line 36 is inserted into the insertion portion 31a. The flange 31b is pressed against the inner surface of the main body case 3 (the inner surface of the rear plate 25). A ground wire 38 is connected to the main body 31c.

  The rear plate 25 is formed with a connector opening 25a into which the insertion portion 31a is fitted. Further, the rear plate 25 is formed with a screw insertion hole 25b through which the screw 39 is inserted. One screw insertion hole 25b is formed on each side of the connector opening 25a.

  Screw insertion holes 30 a through which the screws 41 are inserted are formed at the four corners of the circuit board 30. Receiving bosses 42 for receiving the circuit board 30 are formed at the four corners of the lower surface plate 24. The receiving boss 42 is formed with a screw hole 42 a that is screwed into the screw 41.

  The rear plate 25 is fixed with a shield case 45 obtained by performing copper plating on a metal, for example, a steel plate. As shown in FIGS. 4 and 5, the shield case 45 includes a box-shaped shield part 45a, a pressing part 45b for pressing and holding the power connector 31 against the rear plate 25, and a fixing part 45c. ing. The shield part 45 a covers and shields the main body part 31 c of the power supply connector 31, the line noise filter 32 and the filter capacitor 33. The fixing portion 45 c is fixed to the rear plate 25.

  The shield part 45a is formed with a protrusion 45d that contacts the circuit board 30. The shield case 45 is in contact with the circuit board 30 only with the protrusion 45d. Accordingly, a wiring pattern can be provided in a portion other than the portion where the protrusion 45d abuts.

  The shield part 45a is formed with a wire insertion hole 45e through which the ground wire 38 connected to the power connector 31 is inserted.

  The fixing portion 45c is formed to protrude to the front side from the pressing portion 45b, and one fixing portion 45c is provided on each of the left and right sides of the pressing portion 45b. A screw hole 45f that is screwed into the screw 39 is formed in the fixing portion 45c.

  When fixing the circuit board 30 to the lower surface plate 24, as shown in FIG. 6A, the circuit board 30 is placed on the receiving boss 42 in a state where the insertion portion 31a is fitted in the connector opening 25a. Then, the screw 41 is screwed into the screw hole 42a through the screw insertion hole 30a.

  When the shield case 45 is fixed, as shown in FIG. 6B, the shield part 45a is covered from above so as to cover the main body part 31c, the line noise filter 32 and the filter capacitor 33, and the ground wire 38 is inserted through the wire. The hole 45e is inserted. Then, the screw 39 is screwed into the screw hole 45f through the screw insertion hole 25b. When the screw 39 is screwed into the screw hole 45f and the fixing portion 45c is fixed to the rear plate 25, the pressing portion 45b contacts the flange 31b and presses the flange 31b against the inner surface of the rear plate 25. As a result, the power connector 31 can be sandwiched and held between the inner surface of the rear plate 25. In addition, the shield case 45 contacts the circuit board 30 only in the protrusion 45d. The tip of the ground wire 38 inserted through the wire insertion hole 45 e is attached to the inner surface of the side exterior panel 23.

  Next, the operation of the CD player 2 will be described. When the CD player 2 is used, the power plug 37 is inserted while being pushed into the power connector 31 exposed from the connector opening 25a. Since the power connector 31 is held between the shield case 45 and the rear plate 25, the power connector 31 may fall out to the inside of the main body case 3 even when the power plug 37 is inserted while being pushed. Absent.

  When the power plug 37 is inserted into the power connector 31, power noise enters the power supplied through the power line 36. This power noise is removed by the line noise filter 32. Thereby, power supply noise does not affect each circuit of the circuit board 30.

  The electric power input through the line noise filter 32 is transformed by a transformer (not shown) and is supplied to each part. The disk device 4 rotates the CD 5 with the turntable 9 and reproduces data with the pickup head 7, but noise may be generated from the capacitor 35 during this reproduction. This noise is blocked by the shield case 45 and does not enter the line noise filter 32 and the power connector 31. Thereby, noise is not sent into the circuit board 30 or sent out from the power supply line 36 to the outside.

  In the above embodiment, the shield case 45 is fixed to the rear plate 25 with the screw 39, but may be fixed with a fixing pin or the like.

1 is an external perspective view of a CD player embodying the present invention. It is a top view which shows the inside of a main body case. It is a disassembled perspective view which shows a lower surface board, a rear surface board, a circuit board, and a shield case. It is a disassembled perspective view which shows the connector for power supplies, and a shield case. It is the perspective view which turned up the bottom face of a shield case. (A) is a top view which shows the state which fixed the circuit board to the lower surface board, (B) is a top view which shows the state which fixed the shield case to the rear surface board.

Explanation of symbols

2 CD player (electronic equipment)
3 Body Case 25 Rear Plate 25a Connector Insertion Opening 30 Circuit Board 31 Power Supply Connector 31b Flange 32 Line Noise Filter 33 Filter Capacitor 35 Capacitor 36 Power Line 38 Ground Wire 39 Screw 45 Shield Case 45a Shield Part 45b Pressing Part 45d Projection 45e Wire Insertion hole

Claims (7)

A body case for storing the circuit board;
A power connector mounted on the circuit board;
An opening formed in the main body case, exposing a front portion of the power connector from the main body case and connectable to a power line;
A line noise filter that is disposed in the vicinity of the power connector on the circuit board and removes power noise entering through the power line; and
A shield case that covers and shields the line noise filter and holds the power connector by sandwiching a flange of the power connector between the main body case,
Fixing means for fixing the shield case to the main body case;
An electronic device comprising: The shield case is
A shield covering the line noise filter;
The electronic apparatus according to claim 1, further comprising: a pressing portion that presses the flange against the inner surface of the main body case.   The electronic device according to claim 1, wherein a rear portion of the flange of the power connector is covered with the shield case.   4. The electronic device according to claim 1, wherein a filter capacitor is disposed on the circuit board in the vicinity of the line noise filter, and the filter capacitor is covered with the shield case.   5. The electronic apparatus according to claim 1, wherein the fixing means is a screw that is screwed to the shield case from the outside of the main body case.   6. The electronic apparatus according to claim 1, wherein a wire insertion hole for inserting a ground wire attached to the power supply connector is formed in the shield case.   7. The electronic apparatus according to claim 1, wherein at least one protrusion is formed on the shield case, and only the protrusion is in contact with the circuit board.

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