JPH0247586Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a socket for a baseless metal light bulb that is attached to a wiring board.

(Prior Art) A capless metal light bulb is used as a display lamp for illuminating or displaying an instrument panel of a driver's seat in an automobile, and the capless metal light bulb is attached to a special socket.

This type of baseless socket for a socket for a socket for a socket for a socket for a socket for a socket for a socket for a baseless socket is designed to be attached to a printed wiring board located on the back side of the instrument panel. A lamp insertion hole into which a sealed portion of a baseless metal bulb is inserted is formed at one end of the socket body. In addition, a flange is formed on the outer periphery of the other end of the socket body, and a pair of locking protrusions are formed on the outside of one end, and the wiring board is held between these flanges and the locking protrusions. It's summery.

To explain in more detail, a mounting hole into which the socket is inserted is formed in the printed wiring board, and this mounting hole is formed at a position symmetrical to the circular hole into which the socket body is inserted. It has a notch through which the locking protrusion is inserted (see Figure 1), and when the socket body is inserted into the circular hole, the locking protrusion is inserted into the notch and the socket is inserted in this inserted state. When you rotate the
A printed wiring board is held between these locking projections and the flange, so that the socket can be attached to the printed wiring board.

(Problem that the invention attempts to solve) By the way, in conventional printed wiring boards, printed wiring terminals are formed only on the back side.
Therefore, the socket was provided with a contact on the upper surface of the flange to make electrical contact with the printed wiring terminal. This contact is electrically connected to the lead wire of the baseless metal bulb inserted into the lamp insertion hole.

However, recent printed wiring boards sometimes have printed wiring terminals formed on the front side, and there are also cases where printed wiring terminals are provided on both the front side and the back side to increase reliability of electrical contact. I'm getting used to it.

Conventional sockets in which contacts are provided on the upper surface of the flange part have a problem in that electrical connection with the printed wiring board is impossible for such a printed wiring terminal arrangement.

The present invention attempts to provide a socket for a socket for a socket for a baseless metal light bulb that enables electrical contact and conduction even when printed wiring terminals are formed on either the front or back side of a printed wiring board or on both sides. It is something.

[Structure of the idea]

(Means for Solving the Problems) The present invention provides a socket in which the lead wire of a baseless light bulb is connected between the flange formed on the socket body and the locking protrusion, and the socket is shaped like a U-shape and is imparted with elasticity. It is characterized by the provision of a contactor.

(Function) According to the present invention, when a wiring board is held between the flange and the locking protrusion, the approximately U-shaped contact provided between them elastically contacts the front and back surfaces of the wiring board. Therefore, electrical contact is possible even if printed wiring terminals are formed on either the front or back side of the printed wiring board, or even if printed wiring terminals are formed on both sides. Therefore, a single type of socket can be used even for boards with printed wiring terminals in different positions.

(Embodiment of the invention) The present invention will be described below based on an embodiment shown in the drawings.

In the figure, reference numeral 1 denotes a socket body in the shape of a cylinder with a bottom, which is made of an electrical insulator made of synthetic resin such as nylon. This socket body 1
A lamp insertion hole 2 opening upward is formed at one end, and a flange portion 3 is formed on the outer periphery at the other end. Further, a pair of locking protrusions 4, 4 are provided on the outer side of one end of the socket body 1, axially spaced apart from the flange portion 3, and facing each other in symmetrical positions. Note that the ends of the locking projections 4, 4 have rising walls 5, 5 that are continuous with the flange portion 3, and these locking projections 4, 4, the rising walls 5, 5, and the flange portion 3 form a U-shape. By sandwiching a printed wiring board 20 (to be described later) in the space surrounded by
0.

A crush sealing portion 7 of a baseless metal light bulb 6 is inserted into the lamp insertion hole 2 of the socket body 1. The baseless metal light bulb 6 houses a filament 8 therein, and the filament 8 is supported by a pair of lead wires 9, 9. These lead wires 9, 9 are connected to the crush sealing portion 7.
is penetrated airtight.

When the crushed sealing part 7 of the baseless metal bulb 6 is inserted into the lamp insertion hole 2 of the socket body 1, the lead wires 9, 9 are inserted into the lead-out hole 11 formed in the bottom wall 10 of the socket body 1. 11 to the lower surface side. The lead wires 9, 9 led out to the lower surface side are guided through guide grooves 12, 12 formed on the lower surface of the socket main body 1 to recesses 13, 13 formed on the periphery of the flange portion 3.
Note that the depth of the guide grooves 12, 12 is the same as that of the lead wires 9, 9.
It is formed larger than the diameter of.

In the U-shaped space surrounded by the locking protrusions 4, 4, the rising walls 5, 5, and the flange portion 3,
A substantially U-shaped contact 15, 1 imparted with elasticity
5 is installed. The contactor 15 is made of a highly conductive metal piece such as brass, and is bent into a substantially U-shape so that both opposing pieces are elastically deformed in the direction of opening each other. . These opposing pieces are curved into an arch so that the middle portions protrude inward.

These contacts 15, 15 are fitted into a space surrounded by the locking protrusions 4, 4, the rising walls 5, 5, and the flange portion 3 in a U-shape. A pair of parallel fitting grooves 16 and 17 extending outward are formed on the upper surface of the contactor 15 in these fitting grooves 16 and 17.
By fitting the tips and corners of the lower pieces and sliding them, the contacts 15, 15 fit into the U-shaped space surrounded by the locking protrusions 4, 4, the rising walls 5, 5, and the flange portion 3. It is fitted.

The above-mentioned recess 1 formed on the periphery of the flange portion 3
The lead wires 9 and 9 that have been led up to 3 and 13 are guided along this fitting groove 16 using one of the fitting grooves 16, and are connected to the corner of the lower piece of the contact 15 and the fitting groove. The lead wires 9, 9 are sandwiched between the contacts 16, and thereby the lead wires 9, 9 are electrically connected to the contacts 15, 15.

Printed wiring board 2 shown in FIGS. 1 and 3
0 is a mounting hole 21 into which the socket is inserted.
The mounting hole 21 includes a circular hole 22 into which the socket body 1 is inserted, and a notch formed at symmetrical positions in the circular hole 22 through which the locking protrusions 4 are inserted. It has parts 23, 23. In addition, the printed wiring board 20 has printed wiring terminals 2 on either the front or back side, or on both sides.
5 and 26 (shown in FIG. 3) are formed.

The operation of the socket having such a structure will be explained.

As shown in FIG. 2, the socket body 1 has a baseless metal bulb 6 attached thereto in advance, and a contactor 15,
15 is also attached.

Such a socket is attached to an attachment hole 21 provided in the wiring board 20. That is, the socket main body 1 is made to face the circular hole 22 of the mounting hole 21, and the locking protrusions 4, 4 are placed in the notches 23, 23.
Insert the socket into the mounting hole 21 while facing the socket. When the upper surface of the flange portion 3 hits the lower surface of the wiring board 20, the socket is rotated in the direction of arrow A in FIG.

Then, the edges of the notches 23, 23 in the wiring board 20 are held between the flange 3 and the locking protrusions 4, 4.

In this case, since the contacts 15, 15 are attached to the socket between the flange portion 3 and the locking protrusions 4, 4, substantially both opposing pieces of these contacts 15, 15 are connected to the wiring board 20. Notch 2 in
The edges of 3 and 23 will be held together.

The printed wiring terminals 2 formed on both sides of the wiring board 20 are formed by pressing the contacts 15, 15 in this manner.
5 and 26, the opposing pieces contact each other. Therefore, electrical connection between the socket and the wiring board 20 is established.

The contacts 15, 15 are approximately U-shaped, and these opposing pieces contact both the front and back sides of the wiring board 20, so even if printed wiring terminals are formed only on either the front or back side of the wiring board 20, or Even if printed wiring terminals are formed on both sides, electrical connection is always possible.

In the above embodiment, the lead wires 9, 9 of the baseless light bulb 6 inserted into the lamp insertion hole 2 of the socket body 1 pass through the guide grooves 12, 12 formed on the lower surface of the socket body 1, and then pass through the flange portion 3. The lead is guided to the recesses 13, 13 formed on the periphery of the lead, and is connected to the contact 15 using the fitting groove 16 formed on the upper surface of the flange portion 3. However, the present invention is not limited to this. The wires 9, 9 may be connected to the contact 15 through a conduction groove formed in the upper edge of the lamp insertion hole 2 of the socket body 1, or through a conduction hole opened in the side wall of the socket body 1.

[Effect of idea]

As explained above, according to the present invention, a substantially U-shaped contact is provided between the flange and the locking projection, so when a wiring board is held between the flange and the locking projection, the contact The front and back sides of the wiring board come into elastic contact, so electrical contact is possible regardless of whether the printed wiring terminals are formed on the front or back side of the printed wiring board, or the printed wiring terminals are formed on both sides. Electrical contact is possible even if . Therefore, a single type of socket can be used even for boards with printed wiring terminals in different positions.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is an exploded perspective view of the socket and wiring board, Fig. 2 is an exploded perspective view of the contact, Fig. 3 is a cross-sectional view, and Fig. 4 is an exploded perspective view of the socket and the wiring board.
The figure is a bottom view, and FIG. 5 is an enlarged sectional view of the main part. 1...Socket body, 2...Lamp insertion hole, 3
...flange part, 4 ... locking protrusion, 6 ... mouthless metal bulb, 7 ... crushing sealing part, 8 ... filament,
9... Lead wire, 15... Contact, 16, 17...
...Fitting groove, 20...Printed wiring board, 21...
Lamp mounting hole, 22...circular hole, 23...notch, 25, 26...printed wiring terminal.

Claims (1)

[Scope of utility model registration request] A lamp insertion hole into which a baseless metal light bulb is inserted is provided at one end of the approximately cylindrical socket body, and a flange is provided at the other end, and a wiring board is sandwiched between the flange and the outside of one end of the socket body. In the socket for a baseless bulb having a locking protrusion, a substantially U-shaped contact element to which a lead wire of the baseless bulb is connected and which is imparted with elasticity is provided between the flange and the locking protrusion. A socket for a baseless metal light bulb.