JPH0247585Y2 - - 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 baseless 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 this baseless 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 aims to provide a socket for a baseless metal light bulb that enables electrical contact and ensures reliable contact 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 to do.

[Structure of the idea]

(Means for Solving the Problems) The present invention provides a substantially U-shaped contact element with elasticity between the flange and the locking protrusion, and a baseless metal bulb installed in the lamp insertion hole. The lead wire is attached to and connected to the upper surface of the contact tongue located on the upper surface of the flange of the contactor, bypassing the lower surface of the flange.

(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. Moreover, on the upper surface of the contact tongue located on the upper surface of the flange of the contactor,
The lead wire of the baseless light bulb installed in the lamp insertion hole was connected by bypassing the bottom of the flange, so the lead wire protruded from the top of the flange and hit the back of the printed wiring board strongly. Reliable contact is possible.

(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 airtightly.

When the crushed sealing portion 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 and is pulled out 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 body 1 to winding recesses 13, 13 formed on the periphery of the flange portion 3. Note that the depth of the guide grooves 12, 12 is formed larger than the diameter of the lead wires 9, 9.

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. . Of these opposing pieces, the upper tongue piece 15a is curved into an arch so that the middle part thereof protrudes inward. Further, the lower tongue piece corresponds to the contact tongue piece 15b of the present invention, and this contact tongue piece 15b extends along the upper surface of the flange portion 3 to the peripheral edge. The wrapping recesses 13, 13 and other wrapping recesses 16, 16 are formed in the flange portion 3, where the tip of the extension of the contact tongue piece 15b is located, so as to sandwich this tip.

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 fitting groove 17 extending outward is formed on the upper surface of the fitting groove 1.
By fitting and sliding the bent fitting protrusion 15c formed at the corner of the contact 15 into the contact 7, the contacts 15, 15 are connected to the locking protrusions 4, 4 and the rising walls 5, 5 and 7. It is fitted into a U-shaped space surrounded by the flange portion 3.

As described above, the winding recess 13 formed on the periphery of the flange portion 3 through the guide grooves 12, 12,
The lead wires 9, 9 led up to the winding recess 13, 13 and the other winding recess 16,
It is wrapped around 16 times. With this winding,
The lead wire 9 is also stretched over the upper surface of the contact tongue piece 15b of the contactor 15 extending between the winding recesses 13 and 16. As a result, the lead wires 9,
A lead wire 9 9 is electrically connected to the contacts 15, 15 and is located on the upper surface of the contact tongue piece 15b.
is curved upward as shown in FIG.

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 attached, and a lead wire 9 is wound around the upper surface of the contact tongue piece 15b of this contactor 15.

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 press-fitting the contacts 15, 15 in this manner.
5 and 26, the opposing pieces 15a and 15b are in contact with each other. In this case, the contact tongue 1 located on the lower side
A lead wire 9 is strung across the top surface of 5b.
Since the lead wire 9 protrudes from the upper surface of the contact tongue piece 15b, the lead wire 9 comes into direct contact with the printed wiring terminal 26 formed on the back surface of the wiring board 20.

For this reason, the socket and wiring board 20
An electrical connection is made with the Moreover, contact 1
5 and 15, the contact tongue piece 15b contacts both the front and back sides of the wiring board 20 via the upper piece 15a and the lead wire 9, so printed wiring terminals are formed only on one of the front and back sides of the wiring board 20. Even if printed wiring terminals are formed on both sides, electrical connection is always possible.

Since the lead wire 9 protrudes from the upper surface of the contact tongue piece 15b, it comes into contact with the printed wiring terminal 26 formed on the back surface of the wiring board 20 with strong contact pressure, thereby ensuring reliable conduction. That will happen.

[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. Moreover, since the lead wire of the baseless metal bulb installed in the lamp insertion hole is attached to the upper surface of the contact tongue located on the upper surface of the flange of the contactor, bypassing the lower surface of the flange, the lead wire is connected. The wire protrudes from the top of the flange and strongly contacts the back side of the printed wiring board, allowing for reliable contact.

[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, 15b... Contact tongue piece, 13, 16... Winding recess, 20...
Printed wiring board, 21... Lamp mounting hole, 2
2...Circular hole part, 23...Notch part, 25, 26...
...Printed wiring terminals.

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. A socket for a baseless metal light bulb having a locking protrusion formed therein, wherein a substantially U-shaped contact provided with elasticity is provided between the flange and the locking protrusion, and the baseless metal bulb is mounted in the lamp insertion hole. A socket for a baseless light bulb, characterized in that a lead wire is attached to and connected to the upper surface of a contact tongue located on the upper surface of the flange of the contactor, bypassing the lower surface of the flange.