JPH051290U - Shield device and printed circuit board mounting device - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a shield device and a mounting device for shielding a digital circuit, and an object thereof is to simplify the structure. [Structure] Digital circuit section 2b of double-sided printed circuit board 2
Is the shield case upper 3 and the shield case lower 4, and EM
Shield with the shield plate 1b of the I connector 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  Shield device used for video equipment such as TV receivers and display monitors It is about.

[0002]

[Prior art]

  9 and 10 show a conventional example in which a digital circuit is shielded.

[0003]   As shown in FIG. 10, a through capacitor 9 is prepared in advance on the shield plate 6. After soldering the double-sided printed circuit board 8, multiple shield cases 7 Tighten with a number of screws 14. In addition, the feedthrough capacitor 9 and the relay board 10 Make dashes. The relay board 10 is provided with a connector 12 and is provided with a seal. It is adapted to be relayed to another board by a wire 13.

[0004]   Also, the bracket 11 is required for mounting on a cabinet or the like, After tightening the shield plate 6 to the bracket 11 with screws 15, use the screws 16 to move the cabinet. It was installed with a net etc.

[0005]

[Problems to be solved by the device]

  As mentioned above, in the conventional technology, in order to protect the digital circuit from the interference wave, The digital circuit board is completely covered by a shield case and separated by a feedthrough capacitor. However, it is structurally complicated, and both cost and assembly man-hours are high. It was a spider.

[0006]   In addition, a large area is required in terms of space, so the space of the television receiver can be saved. It was a mess.

[0007]

[Means for Solving the Problems]   The present invention simplifies and saves space that was structurally complicated by the conventional technology. In order to make it more convenient, a connector system is used to connect the child board on the parent board. Was done.

[0008]   In addition, the shield case is divided into upper and lower two pieces and crimped with a beat. The structure is such that the connection by soldering is avoided as much as possible.

[0009]   To prevent defects such as solder cracks from impacts such as dropping and vibration, a U-shaped solid The fixing tools 5 are provided on both sides of the printed circuit board 2, and the fixing tools 5 are locked as shown in FIG. By making the portion 5a and the brim portion 2a of the printed circuit board 2 reversely tapered, The printed circuit board 2 is securely held so as not to come off from the plate.

[0010]   In addition, the EMI connector 1 has a shield for joining with the shield case top 3. The beat 1c is provided on the plate 1b and is joined to the beat 3a of the shield case 3. .

[0011]   Also, the foot 1d is inserted between the cut and raised portion 4b and the bent portion 4c of the lower shield case 4. It is crimped because it is rare.

[0012]

[Action]

  By taking the above measures, the sub-board is attached and detached by the connector on the main board. System, the structure is simplified, the space on the parent board can be used, and the cost and The assembly man-hours can be greatly reduced, and the TV receiver can be made compact and multifunctional. .

[0013]

【Example】

  One embodiment of the present invention will be described with reference to FIGS. 1 to 8.

[0014]   As shown in FIGS. 1 to 5, the digital circuit section 2b is formed on the double-sided printed circuit board 2. Then, the main board (not shown) is coupled by the EMI connector 1. Double-sided pre The digital circuit portion 2b of the printed circuit board 2 includes a shield case upper portion 3 and a shield case lower portion 4 And shielded by the shield plate 1b of the EMI connector 1.

[0015]   At this time, in order to easily connect the respective parts, the beat shapes 3a, 4a and 1c are formed. To provide. In addition, the cut-and-raised part 4b and the bent part 4c of the lower shield case 4 are connected to the EMI connector. Insert the 1 foot 1d of Kector 1 and crimp it.

[0016]   The brim 2a is held by the fixing tool 5 in order to secure the fixing to the main board. At this time, the shield case cannot shield the range of the brim 2a, so as shown in FIG. The through hole 2c on the double-sided printed circuit board 2 and the minimum pitch on the line of the shield case. It has a shield effect by being provided with a chi.

[0017]   FIG. 7 and FIG. 7 show the structure for fixing the digital circuit block having the above configuration to the parent board. 8 shows.

[0018]   The fixture 5 is attached to the parent board 17 in advance, and the print substrate is aligned along the groove 5b. The brim 2a of the plate 2 moves, and the end of the brim 2a is fitted into the lock portion 5a. that time The end of the brim 2a and the lock portion 5a are inversely tapered in the direction of removal.

[0019]   In addition, the fixing tool 5 has a U-shape so that it is extremely resistant to lateral shake due to transportation vibration. It is highly effective in preventing shaking.

[0020]

[Effect of device]

  By adopting the shield device of the present invention, the structure is simplified and space is saved. It is possible to reduce the cost and assembly man-hours, It is possible to achieve higher functionality and functionality.

[Brief description of drawings]

FIG. 1 is a top perspective view of the shield device of the present invention.

FIG. 2 is a bottom perspective view and a partial sectional view of the shield device of the present invention.

FIG. 3 is a vertical sectional view of the shield device of the present invention.

FIG. 4 is a cross-sectional view of the shield device of the present invention.

FIG. 5 is a front view of the shield device of the present invention.

FIG. 6 is a perspective view of an EMI connector used in the present invention.

FIG. 7 is a perspective view of a printed circuit board mounting device.

FIG. 8 is a sectional view of a printed circuit board mounting device.

FIG. 9 is a perspective view of a conventional example.

FIG. 10 is a sectional view of a conventional example.

[Explanation of symbols]

1 EMI connector 1a housing 1b Shield plate 1c beat 1d giga 1e Gigi 2 double-sided printed circuit board 2a brim 2b Digital circuit section 2c through hole 3 On the shield case 3a beat 4 Shield case bottom 4a beat 4b Cut and raised part 4c Bent section 5 fixtures 5a Lock part 5b groove 5c joint 6 Shield plate 7 Shield case 8 double-sided printed circuit board 9 feedthrough capacitor 10 Relay board 11 bracket 12 connectors 13 shielded wire 14,15,16 screws 17 parent board

Claims (2)

[Scope of utility model registration request] 1. A shield device for shielding a digital circuit, comprising a through-hole on a double-sided printed circuit board, a beat-shaped EMI connector for fitting, and an upper and lower two-piece shield case. 2. A structure for mounting the shield device according to claim 1 on a main board, wherein a brim portion projecting from a shield case is provided on an outer shape of a printed circuit board, and a U-shaped fixing tool has a reverse taper. Printed circuit board mounting device with lock part.