JPS58104534A - Tuner shield assembly - Google Patents

Abstract

PURPOSE:To improve the workability and the performance of an assembly, by forming shield plates shielding blocks and a frame plate as one body. CONSTITUTION:An electronic circuit selecting signal from electromagnetic waves of VHF and UHF bands is assembled in a plurality of blocks, blocks and the entire circuit are shielded and assembled in the same chassis. Shield plates 10a-10C and side frame plates are formed incorporatedly in a chassis frame body 10, and a connector 11 with terminals is fitted to a front notch 10e. The front and rear surface of a printed wiring board 12 are mounted with electronic components 13 and paste 15 for solder is applied on the surface in contact with the shield plates. A back shield plate 14 is folded by folding one metallic plate and plurality of notched tage 14a, 14d are provided. The chassis frame body 10, the board 12, and the back sheld plate 14 are sequentially laminated, the shield plates and the electronic circuit are fixed, and the front side of the board 12 is dipped for soldering when the back side is dipped for incorporation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a Qina shield structure used in a television receiver. Relates to a chip-shield structure in which electronic circuits constituting a chip that selects a channel and converts it into an intermediate frequency signal are assembled into a plurality of independent blocks, and the blocks are shielded and the entire circuit is assembled into the same chassis to form an integrated structure. In particular, the structure of the knoll plate was improved.

The tuner of the television receiver supports VHF band and UHF band.
Electronic circuits are built into independent blocks for each band, and in order to sufficiently protect each block and the entire circuit to reduce the ingress and egress of unnecessary signals, a shield plate is installed within the frame to separate each block. A structure is adopted in which a shield cover is provided over the shield cover.

The conventional structure and its problems will be explained with reference to FIGS. 1 and 2. Figure 1 is an exploded perspective view, Figure 2 is an assembled X-
It is an X sectional view. 1 and 2, reference numeral 1 denotes a frame chassis, which is made by bending a metal plate into a U-shape, and is used for fixing a wiring board 6, which will be described later, to a wire 71 by soldering. It is provided with a cut-and-raise 1a and a receiving plate holding claw 1b for holding a receiving plate 2, which will be described later.

2 is a receiving plate held in the U-shaped opening of chassis 1;
A catch plate holding claw 1b made of a metal plate and provided on the support plate 1
A chassis claw insertion hole 2a is provided for insertion of the chassis claw. 6 is a VHF side shield plate made of a metal plate, and 4 is a UHF side shield plate also made of a metal plate. The shield plate 6 has a connecting part 7 that serves as a connecting part for fixing the shield plates 6 and 4 and between the shield plate 3 and the receiving plate 2 by soldering, and the shield plate 6 is connected to the wiring board 6. Similarly, the shield plate 4 is provided with a shield plate board insertion foot 6b that serves as a foot to be inserted into the shield plate 4.
A shield plate connection part 4a which is a connection part for fixing the and /yarn 1 by soldering, and a wiring board 6 which connects the shield plate 4 to the wiring board 6.
A shield plate board insertion foot 4b is provided as a foot to be inserted into the shield plate. Reference numeral 5 denotes a connector with terminals made of an insulating plate to which a plurality of terminals 5a are attached. Reference numeral 6 denotes a wiring board, on which electrical components 7 constituting an electronic circuit are mounted at predetermined positions. Reference numeral 8 denotes an upper solder part, which is connected between the shield plate connecting parts 3a and 4a, between the shield plate connecting part 3a and the receiving plate 2, and between the shield plate connecting part 4a and 7 Y/1 in the shear 1. This is the soldering part at the top. Reference numeral 9 denotes a lower solder portion, which is a portion where the shield board insertion legs 3b, 4b and the terminal 5a and the wiring board 6 are respectively soldered on the back side of the wiring board 6.

In the conventional chester shield structure having this Uhiko configuration, the chassis 1, the receiving plate 2, and the shield plate 64 are each made as separate parts, and the fixing of the chassis 1 and the receiving plate 2,
Since the structure is such that the fixing of the chassis 1 and the shield plate 3.4, the fixing of the receiving plate 2 and the shield plate 6.4, and the fixing of the shield plate 3 and the shield plate 4 are all performed by soldering. , Soldering involves many parts and is difficult to work with.
Furthermore, since the direction in which the chassis 1 and the receiving plate 2 are assembled is the lateral direction (the direction in which they are moved on a horizontal plane), there are problems such as poor assembly efficiency.

SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive China shield structure that can solve the above-mentioned problems of the prior art, improve workability and assembly efficiency, and require fewer parts.

The present invention is characterized in that, in order to achieve the above object, a chassis frame body in which a shield plate for shielding between blocks and a frame plate are integrally formed of a metal plate, and a connector with a terminal is attached to a front notch portion; - A wiring board on which parts constituting the electronic circuit are mounted on the front and back sides and a paste for soldering is applied to the surface position where it contacts the shield plate of the chassis frame, and a single metal plate. A back shield plate is formed by bending and has a plurality of cut-and-raised legs that are fixed to the back side of the wiring board by soldering, and the wiring board is sandwiched in the middle, and a chassis frame body is placed on the front side of the back shield plate, and a back rolled board is placed on the back side of the back shield plate. By stacking, the shield plates and electronic circuits are fixedly placed in their respective fixed positions, and sometimes the back side of the wiring board is dip soldered and the front side is also fixed by soldering at the same time to form an integrated structure.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. FIG. 6 shows a developed perspective view, and FIG. 4 shows a sectional view after assembly. In FIGS. 6 and 4, reference numeral 10 denotes a chassis frame, in which a VHF side shield plate 1Qa, a UHF side shield plate 10b, and a connecting portion 1'DC are integrally formed with a side frame in the shape of an opening. A terminal connector 11 having a plurality of terminals 11a attached thereto is fixed to the notch 10e provided on the front surface by caulking, welding, or the like. The back shield plate fixing holes 10d, which serve as through holes for fixing the back shield plate 14 (described later) to the chassis frame 10, are drilled at multiple locations on the side surface of the palm frame 10. 1
Reference numeral 2 denotes a wiring board, on the front side of which electrical parts 16 constituting an electronic circuit are mounted, and on the back side electrical parts 16 such as resistors and capacitors are mounted at predetermined positions, and furthermore, on the surface of the wiring board 12, A soldering paste 15 is applied to the ground pattern portions that come into contact with the shield plates 10a, 10b and the terminals 11a. Reference numeral 14 denotes a back shield plate, which is formed by bending a single metal plate to form a plurality of legs 14a, a plurality of cut and raised portions 14d, and a connecting portion 14b.
14C is integrally formed. The legs 14a are provided at positions corresponding to the plurality of shield plates 10a and 10b of the chassis 7 frame 10, and the groove cut and raised portions 14d are provided on the ground pattern portion provided on the back side of the wiring board 12. Set it up in the corresponding position.

The back shield plate 14 also has a bent portion 14f having an outer diameter slightly smaller than the inner dimension of the seven-sided frame 10, and a bent portion 14f that corresponds to the back rolled plate fixing hole 10d provided in the chassis frame 10. Multiple chassis fixing claws 1 on the side
4e is provided.

This chassis fixing claw 14e and the back shield plate fixing hole 10d
This prevents disconnection after assembly and acts as a ground/ground.

To assemble the structure, first, the connector with terminals 11 attached to the chassis frame 10 are stacked above the wiring board 12, and the back shield plate 14 is further placed below the wiring board 12.
By stacking and assembling the wiring board 12, the outer shape of the wiring board 12 is fixed by the cut and raised portion 14d of the back shield plate 14, and
A wiring board 12 is held between the frame 10 and the back plate 14.

As a result, immersion soldering on the back side of the wiring board 12 is performed simultaneously with soldering on the front side.

According to the present invention, (1) since the structure is such that a plurality of shield plates are integrally formed on the chassis frame, the shield plate and the chassis frame are required in the conventional structure.

(2) The stacking method makes it easy to automate the production process, and (6)
) The number of parts is fewer than the conventional structure, which makes the product cheaper, and (4) the structure prevents direct external force from being applied to the wiring board, making it a highly reliable integrated structure. There are effects such as being able to do things.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a conventional example, FIG. 2 is a sectional view taken along the line XX, FIG. 6 is an expanded perspective view of an embodiment of the present invention, and FIG. 4 is a sectional view thereof. Explanation of symbols 10... Chassis frame 1, Oa 1. V HF side 7-shield plate iob...UHF side shield plate 10C... Connection remaining part 10d... Back shield plate fixing hole 10e... Notch part 11... Connector with terminal 11a... Terminal 12...・Wiring board 13...
・Electrical parts 14... Back shield plate 14a...
・Legs 14b, 14C... Connection remaining portion 14d... Cut and raise 14e... Chassis fixing claw 14f... Bent part 15... Soldering paste No. 1 Hayashi) 1'3 Diagram

Claims (1)

[Claims] The electronic circuit of Chees, which selects one channel from the VHF (Very High Frequency) band and UHF (Ultra High Frequency) band and converts it into an intermediate frequency signal, is incorporated into multiple independent blocks, shielding each block and the entire circuit. A chassis frame body in which the shield plate that shields between blocks and the frame plate are integrally formed of a metal plate, and a connector with a terminal is attached to the front notch, in a Chenan fold structure assembled on the same chassis to form an integrated structure. , a wiring board on which parts constituting the electronic circuit are mounted on the front and back sides and a soldering paste is applied to the surface position where it contacts the shield plate of the chassis frame; and a single metal plate. A back shield plate having a plurality of cut and raised legs formed by bending and fixed to the back side of the wiring board by soldering, and a 7-sided frame body on the front side with the wiring board in between. By stacking the back shield plates, the shield plate and the electronic circuit are fixed in their respective positions, and the back side of the wiring board is immersed in soldering, and sometimes the front side is also fixed by soldering at the same time, resulting in an integrated structure. Cheena shield structure.