JPH0416445Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] This invention has a structure in which multiple light emitting diodes (LEDs) are connected in series or in parallel to serve as a light source, which is housed in a cap and a screw base is attached to the end. This relates to LED lamps.

[Prior art] Multiple LEDs are connected as a light source, and this is used as a fourth
As shown in the figure, there is one that is built into a cap 1 and has a screw base 2 attached to its end, so that its appearance is similar to a small incandescent lamp used as an indicator light or the like.

However, with such a structure, there is no problem if the cap 1 is about the same size as the base 2, but if it becomes quite large, the mechanical strength will be insufficient and the cap will become unstable when attached.

In addition, a current limiting resistor is built into the screw base 2, but when operating at high voltage, the resistor consumes a lot of power, so the drive current must be reduced, and as a result, the brightness of the LED decreases. When there is a shortage, a situation arises.

[Purpose of the invention] An object of the invention is to provide a light emitting diode lamp with a screw base that has a high heat dissipation effect and can be installed in good electrical and mechanical conditions.

[Summary of the invention] This invention consists of connecting one end of a cap that incorporates a light source consisting of multiple light emitting diodes with a fixed-pitch screw having a size similar to the cap and serving both as heat dissipation and heat retention. On the other end of this screw, an insulating cylinder with an outer diameter corresponding to the socket of the specified size is protruded, and a coil spring is wound around it as a contact part on the circumference, and the base part is fixed, and the lead wire is connected to the insulating cylinder. The screw is connected to the light source through the screw, and the screw has a built-in current limiting resistor, and a center contact portion protruding from the tip surface of the insulating cylinder is provided, and the resistor is connected between the center contact portion and the light source. It is characterized by the fact that when it is installed in a two-stage socket, it is firmly held by the screw part of the fixed pitch, and
Heat is radiated to the panel board through the receiving metal fitting of the socket, and electrical connection is maintained in good condition through the screwing of the coil spring and the spiral groove of the socket, and the contact between the center contact part and the receiving terminal of the socket. There is.

[Embodiment] Figures 1 and 2 show an embodiment of the present invention, in which 11 is a cap, 12 is a heat insulating material, and 13 is a material with good thermal conductivity (such as aluminum). This is a fixed pitch screw portion formed to have an outer diameter corresponding to the size of the cap, and this screw portion 13 is integrated with the end portion of the cap 11 via the heat insulating material 12. A light source consisting of a plurality of light emitting diodes (light emitting diodes are attached to a printed wiring board and connected as required) is incorporated in the cap 11. 1
Reference numeral 4 denotes an insulating cylinder protruding from the end of the screw part 13, which has an outer diameter corresponding to the specified size of the electrical connection part of a two-stage socket (described later), and has a coil on its outer peripheral surface as a peripheral surface contact part. A spring 15 is wound around it. The coil spring 15 has a number of turns corresponding to the number of spiral grooves on the socket side, and its base is fixed with an adhesive 16, and connected to the light source inside the cap 11 via a lead wire (not shown). There is.

Reference numeral 17 denotes a center contact portion provided so as to protrude from the tip end surface of the insulating cylinder 14;
It is connected to the light source in the cap 11 via a current limiting resistor (not shown) built into the cap 3.

As shown in FIG. 2, the two-stage socket has a holder 21 made of insulating material with a flange at one end of a short tube, and a receiving metal fitting 2 having a spiral groove matching the pitch of the screw portion 13 on the outer periphery of the holder 21.
2 is integrated so as to protrude from the tip of the holder 21, and a socket cap 23 of a specified size is integrated inside the holder 21.
is connected to the terminal 24 attached to the bottom of the holder 21, while the receiving terminal 25 is connected to the screw 2 which becomes the external terminal so that it is located on the central axis inside the holder 21.
6. It is fixed by insulating plates 27, 28, nuts 29, etc.

This two-stage socket 20 is inserted into a hole provided in a panel board 30 and fixed so that the receiving metal fitting 22 contacts the panel board 30. When a light emitting diode lamp 10 is attached, the lamp 10
The screw 13 for heat dissipation and retention is located in the socket 2.
The coil spring 15 is screwed into the socket base 23 according to its pitch, and a good electrical contact is achieved.

FIG. 3 shows another embodiment of the present invention, in which an insulating cylinder 41 protruding from the end of the screw 13 is used.
A heavy cylinder is used, and a coil spring 15 is wound around the outer peripheral surface of the cylinder as a peripheral surface contact part as in the above embodiment, but a coil spring 42 is also wound around the inner cylinder 41A.
One end is inserted into the interior through the notch of the inner cylinder 41A and extended in the axial direction to form a center contact portion 43. This coil spring 42 is installed so that it is in a state where there is no external force or is slightly contracted when a small amount of external force is applied, and the other end is connected to the cap 11 through a current limiting resistor.
connected to a light source inside.

In this way, the center contact portion protrudes greatly from the tip end surface of the insulating cylinder 41 before attachment, and even if there is variation in the position of the receiving terminal 25 at the center of the socket 20, the coil spring 42 compresses the receiving terminal 25. The connection will now be in good condition and the connection will be reliable.

[Effects] As described above, according to the present invention, the screw base is made up of two stages, and the large diameter part is responsible for heat dissipation and heat retention.
The electrical connection is made by wrapping a coil spring around the outer circumference of the small diameter part to form a peripheral surface contact part, so when it is installed in a two-stage socket, it is held with sufficient mechanical strength and the heat generated by the lamp is transferred to the thermally conductive part. Heat is efficiently dissipated to the panel board through good screws and socket fittings, and the required brightness can be obtained by increasing the drive current. Furthermore, since the coil spring is used as the peripheral surface contact portion, a good contact state can be achieved even if there is a slight difference in the screw pitch.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view showing an embodiment of a light emitting diode with a screw base according to the present invention, Fig. 2 is a sectional view of the light emitting diode with a screw base attached to a two-stage socket, and Fig. 3 is a cross-sectional view of the light emitting diode with a screw base according to the present invention. FIG. 4 is a side view in a partially broken state showing another embodiment of the present invention, and FIG. 4 is a side view showing a conventional example. 11...Cap, 13...Screw for both heat radiation and retention, 14...Insulating cylinder, 15...Coil spring as peripheral surface contact part, 16...Adhesive, 1
7... Center contact part, 20... Two-stage socket, 2
1... Holder, 22... Receiving metal fitting, 23... Receiving cap, 24... Terminal, 25... Receiving terminal, 26
... Screws, 27 and 28 ... Insulating plate, 29 ... Nut, 30 ... Panel hoard, 41 ... Insulating cylinder, 41A ... Inner cylinder, 42 ... Coil spring as center contact part.

Claims (1)

[Scope of utility model registration request] At the end of the cap that incorporates a light source consisting of multiple light emitting diodes, one end of a fixed-pitch screw with a size similar to the cap and which also serves as heat dissipation and retention is installed, and the other end of this screw is connected with a screw of a specified size. An insulating cylinder with an outer diameter corresponding to the socket is provided protrudingly, a coil spring is wound around it as a contact part on the circumferential surface, and the base part is fixed.
The screw is connected to the light source via a lead wire, and a current limiting resistor is built into the screw, and a center contact portion protruding from the tip surface of the insulating cylinder is provided between the center contact portion and the light source. A light emitting diode lamp with a screw base.