JPH04119699A - Electronic circuit unit - Google Patents

Abstract

PURPOSE:To enable an electronic circuit unit which is compact in structure, easily assembled, and high in reliability to be offered by a method wherein a part of a printed board adjacent to one of its sides is fixed to a shield case main body, and an electronic component mounted on a part of the board adjacent to its side opposed to its former side is fixed to the shield case main body. CONSTITUTION:A component mounted board A1 is temporarily installed by insertion in a shield case main body 3, screws 6 are inserted into holes 3d and driven into the holes 5a of an electronic component 5 to tentatively fix the board A1, screws 8 are inserted into the holes la of the board A1 and driven into the holes 3b of the shield case main body, and the tentative fixing of the board A1 is finished by inserting screws into the residual holes. Then, all the screws are fastened to fix the printed board A1 with screws. Then, a printed board B2 is fixed by screws. In succession, a shield case upper lid 4 is fitted to the shield case main body 3, screws 7 are inserted into holes 4a and driven into holes 3c to tentatively fix the lid 4 to the main body 3, screws are inserted into the residual holes to finish the tentative fixing of the lid 4, and all the screws are driven to fix the upper lid 4 to the shield case main body 3.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electronic circuit unit suitable for mounting a printed circuit board, particularly for use in a pack for incorporating a teletext receiver of a television receiver.

Conventional technology In recent years, improving circuit mounting technology has been a major issue.

A typical conventional pack for incorporating a teletext receiver for a television receiver is one shown in an exploded perspective view as shown in FIG. In the figure, 11 is a single-sided printed wiring board made of phenolic resin, 11a is a square hole into which the legs 12& of shield case frame 12 are inserted, and 12 is t=0.8
~1.0 metal shield case frame 12a penetrates the square hole 11a of the printed circuit board 11 with its leg, and then t=
The leg 12a and the periphery of the square hole 14a and solder are fixed to the shield case lower cover 14 by passing through the square hole 14a of the shield case lower cover 14 of 0.32 mm.

12b is the first hole of the shield case frame 12, and the screw 1 is inserted at a position corresponding to the hole 13a of the shield case lid 13.
This is for fixing the shield case lid 13 and the shield case frame 12 with screws through ε. Reference numeral 12c denotes a second hole of the shield case frame 12, which is used for fixing the shield case lid 12 and the electronic component 15 with a screw 16 at a position corresponding to the hole 16a of the electronic component 15 already mounted on the printed circuit board 11. It is something. 13 is the metal shield case top lid, 1
3M is a hole through which the screw 15 passes, and is located at a position corresponding to the hole 12b of the shield case frame 12. 14 is a metal shield case lower cover, and 14 & is a square hole for fixing the printed circuit board 11 between the shield case frame 12 and the shield case lower cover 14. be. Reference numeral 15 denotes a printer connection connector component mounted on the printed circuit board 11, and 15a is a mounting hole located at a position corresponding to the hole 12C of the shield case frame 12. A teletext broadcast receiving circuit is constructed on this printed circuit board 11 and inside the shield case. These means have a simple structure, but require a lot of man-hours to install and assemble.

Problems to be Solved by the Invention Such conventional electronic circuit units not only require a lot of man-hours but are also large in size, making them unsuitable for use in packs for built-in teletext receivers. The present invention solves the above problems, and aims to provide a reliable electronic circuit unit that is compact, easy to assemble, and reliable.

Means for Solving the Problems In order to achieve the above object, the present invention provides an electronic circuit unit in which a printed circuit board on which electronic components are mounted is housed inside a shield case consisting of a bat-shaped shield case body and a shield case lid. , the printed circuit board is fixed to the shield case body near one side, and the electronic component mounted on the board is fixed to the shield case body near the other side opposite to the one side, so that the printed circuit board is fixed to the shield case body. The electronic circuit unit is fixed to a case body, and the shield case lid is fixed to the shield case body.

Operation According to the above-described structure, the printed circuit board is fixed to the shield case through the hole provided in the circuit board and the hole in the mounted component on the circuit board.

Example Below, regarding an electronic circuit unit according to an example of the present invention,
This will be explained with reference to the drawings.

FIG. 1 is an exploded perspective view showing the configuration of an electronic circuit unit according to an embodiment of the present invention. In the figure, 1 is a printed circuit board A, which is a glass epoxy multilayer board, and components are mounted on the front and back surfaces. Reference numeral 1a denotes a hole provided in the printed circuit board A, which is provided at a position corresponding to the hole 3b of the shield case main body 3, and is screwed to the shield case main body 3 and the printed circuit board A1 by tightening a screw 8. 2 is a printed circuit board B, which is a single-sided board made of phenolic resin and has components mounted thereon that do not need to be shielded. Reference numeral 2a denotes a hole provided in the printed circuit board B2, which is provided at a position corresponding to the hole 3a of the shield case main body 3, and is screwed to the shield case main body 3 and the printed circuit board B2 by tightening a screw 9. 3 is the shield case body, made of metal t=o
, metal fittings made of aMM material bent into a bat shape; 3c is a hole provided in the shield case body 3;
The shield case main body 3 and the shield case top cover 4 are screwed together by tightening screws provided at positions corresponding to the holes 4a. Reference numeral 3d indicates a hole provided in the shield case main body 3, and is provided at a position corresponding to the hole 5a provided in the electronic component 6 already mounted on the printed circuit board A1. 4 is an upper cover of the shield case, which is constructed by bending a metal t-0, 32 material. The electronic component 5 is a printer connection connector component mounted on the printed circuit board A1.

Using the above components, first, the shield case body 3
Temporarily install the mounted printed circuit board A1 by inserting it into the hole 3d and temporarily fixing it by screwing it into the hole 5a of the electronic component 6, while passing the screw 8 through the hole 1a of the printed circuit board A1. , temporarily fix it by screwing it into the hole 3b of the shield case main body 3, and then insert the screw into the remaining hole to complete the temporary fixing. Thereafter, all the screws are tightened to fix the printed circuit board A1 to the shield case main body 3. Next, printed circuit board B2
is temporarily installed in the shield case main body 3, a screw 9 is passed through the hole 2a and temporarily fixed in the hole 3a, and then a screw is inserted into the remaining hole and temporarily fixed. Thereafter, the printed circuit board B2 is fixed to the shield case body 3 by tightening the screws. Next, fit the seal case top cover 4 to the shield case main body 3, screw the screws 7 through the holes 4a and into the holes 3C for temporary fixation, and then insert the screws into the remaining holes to complete the temporary fixation. are fixed, and the shield case main body 3 and the shield case upper cover 4 are fixed with screws.

With this configuration, for example, when a printer connection connector part is used in a pack for a teletext broadcasting receiver, the connector part functions as both an electrical part and a structural part.
This reduces the number of screws, which has a cost-cutting effect, and also has the effect of reliably fixing the connector to the shield case.

Effects of the Invention As is clear from the embodiments described above, the present invention reduces the number of screws and the man-hours required for fixing the electronic components, since the electronic components mounted on the printed circuit board are also used as structural components and are fastened with screws. Can be securely fixed to the shield case.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing the structure of an electronic circuit unit according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view showing the structure of a typical conventional teletext broadcasting receiver. 1...Printed board A, 2...Printed board B13...Shield case body, 4...
... Shield case top lid, 5... Electronic components, 11... Printed circuit board, 12... Shield case frame, 13... Shield case top lid, 14... Lower lid of shield case, 15...
...Electronic parts. Name of agent: Patent attorney Akira Okaji and 2 others Print) Board diagram

Claims (1)

[Claims] In an electronic circuit unit in which a printed circuit board on which electronic components are mounted is housed inside a shield case composed of a pad-shaped shield case body and a shield case lid, the vicinity of one side of the printed circuit board is fixed to the shield case body, and the By fixing electronic components mounted on the board to the shield case body near the other side opposite to one side, the printed circuit board is fixed to the shield case body, and the shield case lid is fixed to the shield case body. electronic circuit unit.