JPH0347356Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a mounting structure for a shield body used in high frequency equipment such as a television tuner.

Prior Art High-frequency equipment such as tuners sometimes uses a double shield cover to improve shielding characteristics.

For example, in the shielding structure of a high-frequency device shown in FIG. 3, a printed wiring body 2 is assembled into a frame base 1 of a chassis, and then a back shield body 3 that comes into contact with the inner peripheral surface of the base is fitted to provide an inner shield.
Further, a shield cover (not shown) is fitted on the outside so as to cover the base opening. Here, when attaching the back shield body, it is common to fix it by press-fitting it into the printed wiring body or the inner periphery of the base frame.

Further, the back shield body is formed so that bends and joints 4 are minimized so that it does not come into contact with component leads of a wiring body in which each component is mounted on a printed board.

Problems that the invention aims to solve Despite the shape of such back shields, which cannot be made into a structure with sufficient strength, the mounting structure is a press-fit holding structure with the printed circuit board or base, and the installation of the back shield body is difficult. There were problems with the shield body sometimes deforming or being difficult to combine.

Means for Solving the Problems Therefore, the present invention has been proposed in view of the above-mentioned deficiencies, and aims to provide a new and improved shield mounting structure.

According to the present invention, in a high-frequency device in which a shield body is attached to the inner circumferential surface of a frame-like frame housing a printed wiring body in at least a plurality of places and is covered with an outer shield cover, the shield body of the frame-like frame base and A structure is provided in which tongue pieces formed by notches are provided at a plurality of contact points on the open side, and inner bent portions are formed on the tongue pieces to hold the shield body. A structure is disclosed in which the back shield body can be held by tongue pieces even under a method in which a clearance is provided to the inner periphery of the frame base.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIGS. 1 and 2 show the main parts of a high-frequency tuner having a backside shield mounting structure according to the present invention.

As shown in the figure, this tuner is mounted by housing a printed wiring body 12 in a frame base 11 of a rectangular chassis, and combining a shield body 13 on the back side. Thereafter, an outer shield cover is placed on the back opening of the frame base 11 to form a shield housing. Frame base 1 for this chassis
1 has at least a pair of notches 1 from its opening side.
4 is provided, and a V-groove bent portion 16 is provided in this tongue piece 15 to facilitate bending. The base 11 and the back side shield body 13 are fixed by bending the tongue piece 15 provided with the V-groove bent part 16 inward and sandwiching the shield body 13 between the printed wiring body board and the tongue piece 9. This backside shield body 13 does not need to have a structure to hold it with the frame base, so
0.3mm to 0.4mm to the inner circumference of the base frame 11
This allows for a design with a clearance of Therefore, the shield body can be easily and reliably assembled and attached to the frame base, greatly improving work efficiency.

Effects of the Invention According to the shield body attachment structure having the above-described configuration, the back side shield body can be easily and reliably assembled without being deformed when the frame base is attached. In addition, V
Since it is held using the groove bent part, it is securely fixed and held on the base.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the main parts of the shield body mounting structure in the tuner according to the present invention, Fig. 2 is an exploded perspective view showing the attachment of the shield body of the tuner of Fig. 1, and Fig. 3 is a conventional back shield structure. FIG. 11... Frame base, 12... Printed wiring body, 13... Shield body, 14... Notch, 1
5... tongue piece, 16... V groove bent part.

Claims (1)

[Scope of Claim for Utility Model Registration] A high frequency device in which a shield body is attached to the inner circumferential surface of a frame-like frame housing a printed wiring body in at least a plurality of places and is covered with an outer shield cover, wherein the shield of the frame-like frame base is covered with an outer shield cover. A shield characterized in that a tongue piece formed by a notch is provided from the opening side at some or all of the plurality of points of contact with the body, and an inner bent part is formed on the tongue piece to hold the shield body. Body mounting structure.