JPH0252393B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field of the Invention The present invention relates to a lamp socket, and more particularly to the structure of a socket into which a lamp mounted in a communications exchange and used for display etc. can be removably inserted. It is something.

(b) Background of the Technology For example, in a communications switchboard, a display panel may include a large number of lamps used to display various functional states (operating states) of the switchboard.
Incandescent lamps, light emitting diodes (LEDs), and the like are often used as this type of lamp, and are often removably mounted on a printed circuit board. That is, these lamps are removably mounted on a printed board by inserting their lamp terminals into lamp sockets that are previously attached to the printed board. The socket terminal of the lamp socket is inserted into the through hole of the printed board, fixed to the printed board by soldering, and connected to the conductor pattern of the printed board. Therefore, this type of lamp socket has to be protected against heat during soldering,
When the lamp is an incandescent lamp, it is particularly desirable to have a structure that can prevent the adverse effects of the heat generated by the lamp, and also prevent unauthorized entry of solder and solder flux during soldering.

(c) Prior art and problems FIG. 1 is a plan view of a conventional lamp socket 10.
FIG. 2 is a side view (partially shown in cross section) seen from the direction of arrow P in FIG. ) 15 is a diagram illustrating a state in which it is inserted. This lamp socket 10 is formed by a socket housing 11 with a socket terminal 12 fixed therethrough. The housing 11 is formed into a cylindrical shape with upper and lower surfaces 11a and 11b substantially parallel to each other by molding or the like from an insulator such as a resin material, and has vertical through holes (in this case, two holes).
11c is provided. The socket terminal 12 is
As shown in Figure 3, roll forming method from metal plate,
It is formed into a hollow cylindrical shape with the lower end closed by a drawing method, etc., and this hollow part is used as a lamp terminal (second
It is formed as an insertion hole 12a of FIG. 15a. Therefore, this socket terminal 12 has a slit 12b formed at the joint between both edges of the metal plate. As shown in FIG. 2, the socket terminal 12 has its upper end aligned with the upper surface 1 of the housing 11.
1a, and its lower part protrudes downward from the lower surface 11b of the housing and is fixed thereto. Note that this protruding portion will be referred to as a protruding terminal portion 12c herein. Now, in this lamp socket 10, as shown in FIG.
is inserted into the through hole 13a (indicated by the dashed-dotted line), and fixed to the printed board 13 by solder (indicated by the dashed-dotted line) 14 on the bottom surface of the printed board 13, and the conductor pattern (not shown) of the printed board 13. ) is connected. And socket terminal 12
Insert the lamp terminal 1 into the insertion hole 12a (see Figure 3).
5a, the lamp 15 is attached to the lamp socket 10. However, this lamp socket 10 has the following problems.

The socket housing 11 has a lower surface 11b.
Since the entire surface of the board is in close contact with the printed board 13, a large amount of heat during soldering can be easily absorbed through the printed board 13. For this reason, the housing 11
thermally expands and the socket terminal 12 and housing 1
The adhesion between 1 tends to deteriorate. When this adhesion deteriorates, solder or solder flux rises along the outer peripheral surface of the socket terminal 12 due to capillary action and enters the inside through the entrance of the lamp terminal insertion hole 12a, resulting in the connection between the lamp terminal 15a and the insertion hole. 12
The contact between a and a may be deteriorated.

Solder and solder flux may enter the inside of the socket terminal 12 through the slit 12b, leading to poor insertion or poor contact of the lamp terminal 15a. That is, if soldering is performed with the lamp terminal 15a inserted into the insertion hole 12a in advance, the lamp terminal 15a may be damaged by the solder that has entered.
There are cases where the lamp 15 becomes stuck and it becomes impossible to remove the lamp 15. In addition, the lamp terminal 15a
If soldering is performed without inserting the lamp terminal 15a into the insertion hole 12a, the intruding solder may obstruct the lamp terminal 15a from entering, resulting in a poor insertion, or the solder flux may enter the insertion hole and prevent the lamp terminal 15a from entering the insertion hole. If it adheres to the inner surface of the solder flux 12a, poor electrical contact may occur due to the insulating properties of the solder flux.

Since the protruding terminal portion 12c of the socket terminal 12 is loosely inserted into the through hole 13a (for example, the outer diameter of the protruding terminal portion 12c is approximately 0.5 mm and the inner diameter of the through hole 13a is approximately 1.0 mm), During the process of inserting the lamp socket 10 into the printed board 13 and moving the printed board 13 to the solder bath, the lamp socket 10 may escape or fall off from the printed board 13 due to vibration or impact.

Since the upper surface 11a of the socket housing 11 is in full contact with the bottom surface of the lamp 15, the heat generated by the lamp 15 is conducted to the printed circuit board 13 through the lamp socket 10, contributing to the rise in temperature of electronic components on the printed circuit board. This results in early deterioration of electronic components, deterioration of characteristics, etc., and also shortens the life of the lamp 15.

(iv) Purpose of the Invention In view of the problems of the prior art described above, the purpose of the present invention is to minimize the absorption of heat during soldering and heat generated by a lamp, and prevent unauthorized intrusion of solder and solder flux. It is an object of the present invention to provide a lamp socket having a structure capable of preventing the lamp socket from escaping or falling off during movement of a printed board before soldering.

(E) Structure of the Invention In order to achieve the above object, the present invention includes a socket housing formed in the shape of a short column from an insulator such as a resin material, and a socket that penetrates the housing in the vertical direction. A plurality of socket terminals are fixed to each other and have lamp terminal insertion holes on the upper end side, and the lower end side is formed as a protruding terminal part that protrudes from the lower surface of the socket housing and is inserted into a through hole of a printed circuit board or the like. In the lamp socket, a plurality of upper protrusions for floating the lamp are provided on the upper surface of the socket housing, and a plurality of lower protrusions for floating the housing are provided on the lower surface of the socket housing, and the lower protrusions are provided on the lower surface of the socket housing. consists of each pair of protrusions that are arranged opposite to each other in close proximity to the outer peripheral surface of the base of each of the protruding terminal parts, and a protrusion that is arranged at a position spaced apart from each of the protruding terminal parts,
Each of the pairs of protrusions has a small protrusion that protrudes further downward from the lower surface of the protrusion to clamp the outer peripheral surface of the protruding terminal portion, and is to be elastically deformed and inserted into the through hole together with the protruding terminal portion. The socket terminal has a main body portion having a lamp insertion hole and a protruding terminal portion integrally formed with a stepped portion interposed therebetween, and a circumferential annular projection is provided on the outer peripheral surface of the main body portion. A lamp socket is provided.

(F) Embodiments of the Invention Examples of the present invention will be described in detail based on the drawings.

FIGS. 4 to 7 are diagrams for explaining embodiments of the present invention. In these figures, the same parts as in FIG. 2 mentioned above are designated by the same reference numerals. Therefore, 13 is a printed board, 13a is a through hole provided in the printed board 13, 14 is solder, 15 is a lamp (in this case, an incandescent lamp),
15a each indicates a lamp terminal. Note that each of these parts is indicated by a dashed line.

4 is a plan view of an embodiment of the lamp socket 20 of the present invention, FIG. 5 is a side half-sectional view taken along line A-B-C-D in FIG. 4, and FIG. F-
A side half-sectional view taken along the line G-H-I (however, it shows the state where it is attached to the printed board 13 and the lamp 15 is inserted), and FIG. 7 is a bottom view seen from the direction of the arrow Q in FIG. It is a diagram. This lamp socket 2
0 is basically formed by penetrating and fixing a socket terminal 22 to a socket housing 21, and the protruding terminal portion 22c of the socket terminal 22 is inserted into the through hole 13 of the printed board 13, basically as in the conventional example described above.
a and is fixed to the printed board 13 with solder 14 and connected to a conductive pattern (not shown). The socket housing 21 is formed from an insulator such as a resin material into a cylindrical shape with substantially parallel upper and lower surfaces 21a and 21b by molding or the like, and is provided with a pair of vertical through holes 21c. A plurality of upper protrusions 21d (consisting of four protrusions in this case) are provided at equal intervals along the outer periphery and are integrally formed with the upper surface 21a, and a plurality of protrusions (in this case, four protrusions) are provided on the lower surface. , six in total) are provided integrally with the lower surface 21b. As clearly shown in FIG.
A total of four protrusions are provided as pairs of protrusions facing each other in close proximity to the outer peripheral surface of the lower protrusions 21f. There are two. Each of the lower protrusions 21e is provided with a small protrusion 21g that protrudes further downward from the lower surface thereof and is shaped to clamp the protruding terminal portion 22c. Now, as shown in FIG. 6, when the lamp 15 is inserted into the lamp socket 20, the upper protrusion 21d connects the lower surface 15b of the lamp to the socket housing 21.
It plays the role of floating and arranging it apart from the upper surface 21a of the. Therefore, the lamp lower surface 15b only contacts the upper surface of the upper protrusion 21d,
The contact area is significantly reduced compared to conventional methods. As a result, the socket housing 2 is removed from the lamp lower surface 15b.
The amount of heat conducted to 1 can be significantly reduced compared to the conventional method. Moreover, this upper protrusion 21d forms an upper open space 24 between the upper surface 21a of the socket housing 21 and the lamp lower surface 15b. This upper open space 24 serves as a ventilation space and has the function of dissipating heat radiated from the lower surface of the lamp by convection. By providing the upper protrusion 21d in this manner, the amount of heat generated by the lamp 15 conducted to the socket housing 21 can be significantly reduced. Next, as shown in FIG.
3, the lower surface 21b of the housing is spaced apart from the upper surface 13b of the printed board and is placed in a floating position. Therefore, the printed board top surface 13b only comes into contact with the bottom surfaces of the lower projections 21e and 21f, and the contact area is significantly reduced compared to the prior art. As a result, the amount of heat conducted from the printed board top surface 13b to the socket housing 21 during soldering can be significantly reduced compared to the conventional method. Furthermore, a lower open space 25 is formed between the lower surface 21b of the socket housing 21 and the printed board upper surface 13b by the lower protrusions 21e and 21f. This lower open space 25 has the same role and function as the upper open space 24 described above. Therefore, in this way, the lower protrusions 21e, 21f
By providing this, it is possible to significantly reduce the heat conducted from the printed board top surface 13b to the socket housing 21 during soldering. next,
The small protrusion 21g is a portion that is inserted into the through hole 13a together with the protruding terminal portion 22c, as also shown in FIG. And the small protrusion 21g is
Free state (state before insertion into through hole 13a)
In this case, the outer diameter of the outermost circumference is formed to be slightly larger than the inner diameter of the through hole 13a,
Moreover, the inner surface thereof is formed to be slightly spaced apart from the outer circumferential surface of the protruding terminal portion 22c. Therefore,
The small protrusion 21g is forcibly inserted into the through hole 13a by utilizing its elastic deformation, and as a result, it is fixed in the through hole 13a by its elastic restoring force. As a result, the socket housing 21
will be temporarily fixed on the printed board 13.
Therefore, before soldering, when the printed circuit board 13 with the lamp socket 20 inserted therein is moved to the solder tank, vibrations may cause the lamp socket 20 to escape or fall off from the printed circuit board 13 due to the shock caused by this small protrusion 21g.
This can be prevented by socket terminal 2
2 is a main body portion 2 having a lamp terminal insertion hole 22a;
2b and the protruding terminal portion 22c form the male tapered portion 22.
It is formed integrally through d. A contact 23 is press-fitted into the insertion hole 22a, and a circumferential annular projection 22e is integrally provided on the outer peripheral surface of the main body 22b. Contact 2
3 is formed into a hollow cylindrical shape from an elastic conductor, and its lower part is divided into a plurality of parts (four in this case) by an axial cut groove and narrowed inward. In the hollow part of this contactor 23,
As shown in FIG. 6, the lamp terminal 15a is inserted and penetrated through the constricted portion against its elasticity. Therefore, the lamp terminal 15
a can be inserted into the contactor 23 in close contact with the contactor 23. The annular protrusion 22e has an outer diameter slightly larger than the inner diameter of the through hole 21c of the housing 21, and the main body 22b is formed so that the outer diameter thereof is slightly larger than the inner diameter of the through hole 21c of the housing 21.
When it is press-fitted inside, it bites into the inner peripheral surface of the through hole 21c. Thereby, the space between the outer circumferential surface of the main body portion 22b and the inner circumferential surface of the through hole 21c is completely closed in the vertical direction. Therefore, even if the solder 14 rises along the outer peripheral surface of the main body portion 22b due to capillary action during soldering, the annular protrusion 22e completely prevents the solder 14 from rising any further. In addition, since this socket terminal 22 is not provided with the slit in the conventional example described above, solder and solder flux can be completely prevented from entering through the wall of the insertion hole 22a. When the main body part 22b is inserted into the through hole 21c of the housing, the male taper part 22d of the socket terminal 22 is connected to the female taper part (the inner part of the lower protrusion 21e) provided at the lower end of the through hole 21c. 21h, which is formed in the hole 21c, serves to position the main body portion 22b coaxially with the through hole 21c. Therefore, the main body portion 22b
The male tapered portion 22d and the annular projection 22e also serve to position and fix the socket terminal 22 in the through hole 21c in the horizontal and vertical directions. In addition, in FIGS. 5 to 7, the inner peripheral surface of the through hole 21c of the socket housing 21 and the outer peripheral surface of the main body part 22b of the socket terminal 22 are shown spaced apart for the sake of clarity. There is, but
In practice, these two are formed so as to fit together almost tightly.

As explained above, this embodiment has various advantages not found in the past, and is particularly effective when an incandescent lamp is used as the lamp, but it is also effective when used with other discharge lamps, such as light emitting diodes ( Almost the same effect can be obtained even when using LED) etc.

Note that the present invention is not limited to the above-mentioned embodiments, and for example, the upper protrusion 21d and the lower protrusion 21
The number and shape of the sockets e and 24f can be changed to any number or shape as required, and the socket housing may be formed into a prismatic shape, for example, and various other modifications can be made. It can also be applied to

(g) Effects of the Invention As explained above in detail, the lamp socket of the present invention has an upper protrusion and a lower protrusion provided on the upper and lower surfaces of the socket housing, and a small protrusion further provided on the lower protrusion, and By using a socket terminal with an annular protrusion, the heat absorbed by the socket housing can be greatly reduced, the thermal expansion of the housing can be minimized, and undesirable solder or solder flux can be applied to the inside of the socket terminal. It has great effects in that it can completely prevent intrusion and also prevent the lamp socket from escaping or falling off the printed board before soldering, improving product quality and yield, and improving reliability. It greatly contributes to improving sexual performance.

[Brief explanation of drawings]

FIG. 1 is a plan view of a conventional lamp socket 10;
FIG. 2 is a side view seen from the direction of arrow P in FIG. 1 (however, it is partially shown in cross section and shows the state where it is attached to the printed board 13 and the lamp 15 is inserted);
3 is a perspective view of the socket terminal 12 of FIG. 1, FIG. 4 is a plan view of the lamp socket 20 of the present invention, and FIG. 5 is a side half view taken along line A-B-C-D of FIG. Cross-sectional view, Figure 6 is E-F-G-H in Figure 4.
-A side half-sectional view taken along line I (however, it shows the state where it is attached to the printed board 13 and the lamp 15 is inserted), and FIG. 7 is a bottom view seen from the direction of arrow Q in FIG. . 20... Lamp socket of the present invention, 13... Printed board, 13a... Through hole, 14... Solder, 15... Lamp (in this case, incandescent lamp),
15a...Lamp terminal, 21...Socket housing, 21a...Top surface of socket housing, 2
1b... lower surface of socket housing, 21c...
Vertical through hole, 21d... Upper projection, 21
e, 21f...lower protrusion, 21g...small protrusion, 2
1h...Female taper part, 22...Socket terminal,
22a...Lamp terminal insertion hole, 22b...Main body part, 22c...Protruding terminal part, 22d...Male taper part (step part), 22e...Annular projection, 23...
Contactor, 24... upper open space, 25... lower open space.

Claims (1)

[Scope of Claims] 1. A socket housing formed into a short column shape from an insulator such as a resin material, which is fixed to the housing by penetrating it in the vertical direction, and has a lamp terminal insertion hole on the upper end side, and a socket housing on the lower end side. In a lamp socket comprising a plurality of socket terminals which are formed as protruding terminal portions which protrude from the lower surface of the socket housing and are inserted into through holes of a printed circuit board, etc., a plurality of socket terminals for floating the lamp are provided on the upper surface of the socket housing. and a plurality of lower protrusions for floating the housing are provided on the lower surface of the socket housing, and the lower protrusions are adjacent to the outer peripheral surface of the base of each of the protruding terminal parts and are mutually arranged. Each pair of protrusions is arranged to face each other and a protrusion is disposed at a position spaced apart from each of the protruding terminal parts, and each of the pair of protrusions has a protrusion further protruding downward from the lower surface of the protrusion to form the protruding terminal part. a small protrusion formed to clamp the outer peripheral surface and to be elastically deformed and inserted into the through hole together with the protruding terminal portion;
The socket terminal has a main body portion having a lamp insertion hole and a protruding terminal portion that are integrally formed with a stepped portion interposed therebetween, and a circumferential annular projection is provided on the outer peripheral surface of the main body portion. Features a lamp socket. 2. The lamp socket according to claim 1, wherein the upper projections are arranged at regular intervals along the outer periphery of the upper surface of the socket housing.