JPH02262285A - Socket - Google Patents

Abstract

PURPOSE: To provide a socket requiring no insertion force used for an electric part by superimposing the intermediate and uppermost plates having socket openings by means of cams on the lowermost plate having at its socket openings contacts each constituted of a leg and two prongs. CONSTITUTION: Three plates 12, 14 and 16 have lead insertion openings 114 adapted to be vertically aligned when these plates are superimposed on one another. The lowermost plate 12 has at each opening a contact constituted of a leg 36 and two elastic prongs 40 and 42 separated from each other, which is adapted to project into the opening of the uppermost plate 16 when the plates 12, 14 and 16 are superimposed on one another. The rotation of an actuator 18 separates the prongs 40 and 42 situated in the openings of the plates 14 and 16 from each other by means of a contact member, in which state the lead of an electric part is inserted thereinto. The rotation of the actuator 18 to the original position after the insertion brings the prongs 40 and 42 approaching each other so as to contact with the lead. That materializes a socket requiring no insertion force used for an electric part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention provides a zero insertion force (zero insertion force) method for attaching electronic components to a circuit board.
Z IF ) Regarding sockets. More particularly, the invention provides a ZI with contacts in a normally open state.
Regarding F socket.

Traditionally, ZIF sockets used to attach electronic components, such as integrated circuits, to circuit boards have used contacts that are normally in an open position. Such a socket is disclosed in US Pat. No. 3,763,345. One of the problems with using contacts that are normally open is due to the constant pressure that must be applied to keep the contacts closed. This force places excessive stress on the plastic socket, which can eventually break, deteriorate, or weaken, causing the contacts to quickly separate from the lead terminals of the electronic component.

A socket according to the invention solves the above-mentioned problems by using a single piece contact which is normally open. The contact is designed so that the force applied by the plastic socket is only required for a short period of time to open the contact and insert the lead terminal of the electronic component. By eliminating the need for force to secure the lead terminals of electronic components, wear and tear on the socket is reduced. Furthermore, by using contacts that are normally open, the electrical and mechanical connection of the electronic component to the lead terminals is stable.

[Object of the Invention] The object of the invention is to provide a new and unique ZIF socket.

Another object of the invention is to provide a ZIF socket with contacts that are normally open.

Another object of the invention is to provide a ZIF socket that reduces stress on the plastic socket portion.

Still another object of this invention is to provide Z
The purpose is to provide an IF socket.

Other objects of the present invention will become clear from the following embodiments described based on the accompanying drawings.

[Embodiments] Hereinafter, embodiments of the socket according to the present invention will be described based on the accompanying drawings. The zero insertion force (Zl,000) type socket 10 depicted in FIGS. 1 to 14 has a base member 12.
, a middle plate 14 , a top plate 16 , and an actuator 18 . All of these parts are made of molded plastic.

As shown in FIG. 3, base member 12 includes a supporting housing 34. As shown in FIG. Housing 34 has a hole 82 for receiving cam rod 58 of actuator 18 for camming. Base member 12 also has a pair of spaced apart end flanges 78. A notch is formed between the end flanges 78 for receiving the cam 64 of the actuator 18. At the opposite end of the housing 34 there is another pair of flanges 79 (one flange 79) also forming a notch (not shown).
(shown in FIG. 12) is provided (similar to end flange 78 and notch 80) to receive cam 68 of actuator 18. As you can see from the drawing, the guide rail 30 is straight
is formed on the base member 12. Base member 1
2 has a plurality of openings 86. As best seen in FIG. 0, the opening 86 has a narrowed portion 90 at the bottom;
Portion 90 communicates with the upper thick portion bounded by ledge 88 . Standoffs 91 located at the corners extend from the bottom surface of the base member 12 to maintain a constant spacing between the support surface and the base member 12. Base member 1
2 is further provided with square-shaped notches 26, 28 (only one fully depicted).

The middle plate 14 has a flange 9 forming a notch 94.
2.93 and a flange 95.97 forming a notch 96
and has. Flanges 93,95 are spaced apart and define a central notch 98. Notch 98 receives housing 34 of base member 12. A groove 100 is formed in the middle plate 14. The groove 100 fits into the guide rail 30 to prevent the base member 12 and the middle plate 14 from shifting laterally.

A vertical stop member 102 is formed at the end portion 104 of the middle play 1/14. The middle plate 14 has a plurality of openings PI1 aligned with the openings 86 of the base member 12.
It has 106. The shape of the opening 106 is as shown in FIGS. 6 and 9.
As shown in FIGS.

Each opening 106 is connected to a wall 108 (see FIGS. 6 and 12).
and a downwardly directed radial wall 109. The wall 108 has protrusions 10 that are spaced apart.
5. Projection 105 has an end 103 that is substantially perpendicular to wall 108 (see FIG. 10).

The top plate 16 has integrated supports 32, 33 with holes 1, 16, 118 in each case. The top plate 16 also has an L-shaped protrusion 110°112.

The protrusions 110.112 form the notches 26. of the base member 12.
28 to slidably fix the top plate 16 to the base member and slidably position the middle plate 14 between the top plate 16 and the base member 12. Support 32 is provided with a notch or square opening 120 that communicates with hole 116. Similarly, support 33 is provided with a notch or square opening 122 communicating with hole 118. Top play 1・
16 further has an opening 114. The opening 114 is aligned with the opening 106 of the middle plate 14,
It has a shape as shown in FIGS. 6 and 9 to 12.

The opening 114 is defined by three walls 123 having a tapered shape and one vertical wall 124. Opening 1
A protrusion 121 having substantially the same shape as the protrusion 105 of the middle plate 14 extends within the middle plate 14 . FIG. 12 clearly shows the shape of the openings of the base member 12, middle plate 14, and top plate 16 when they are overlapped.

As can be seen from the drawings, the contact 20 is formed from a single piece of conductive metal and has a foot 36 and a head 38. The head 38 is horizontally offset from the foot 36 and has spaced apart resilient brongs 40,42.

The terminal ends of the brongs 40, 42 form ears 44, 46 which each extend in opposite directions. Blong 4'0.42
are formed so that they bias each other when in the rest or closed state.

The brongs 40.42 abut each other at lead terminal contact surfaces 50.54.

As shown in FIG. 3, the actuator 18 has an arm 56 and a cam rod 58 integrally attached thereto. Cam rod 58 is formed substantially perpendicular to arm 56. The arm 56 has a handle portion 60 that can be lifted for easy handling by the user. The cam rod 58 has a central body 62 and peripheral circular cams 64, 66, 68. As shown in FIGS. 7 and 8, the cams 64, 66, 68 have similar peripheral shapes and are eccentric from the body 62.

The cam rod 58 also has a recessed cam surface 70.72 and a recessed cam surface 74.76. Cam surfaces 70.72 are adjacent to each side of cam 64, and cam surfaces 74.76 are adjacent to each side of cam 66. Cam surface 70.72,7
4.76 have a similar circumferential shape, and both are provided with similarly arranged end walls at the ends of the cam surfaces 70.72, as shown in FIG. As can be seen from FIG. 8, the cam surface 76, like the cam surface 74, gradually tapers outward.

FIG. 9 shows the closed state, and the middle plate 14
The flange 93 is in contact with the cam surface 72. Similarly,
Flange 92 abuts cam surface 70 , flange 95 abuts cam surface 74 , and flange 97 abuts cam surface 76 . In this state, the brongs 40, 42 are biased together due to their spring-like properties, and there is no force on the base member 12, middle plate 14, and top plate 16. Therefore, the possibility that the socket portion will be damaged or deformed due to stress is extremely small. FIG. 13 shows the orientation of cam 64 relative to top plate 16 when actuator 18 is in the closed position.

To unfold the brongs 40.42 and insert electronic components between them, each user must lift the actuator 18 and
Rotate to a position n indicated by a broken line in the figure. When the actuator 18 is lifted, the cam rod 58
Rotate to the position shown in the figure and FIG. The recessed cam surfaces 70, 72, 74, 76 are pressed against adjacent flanges 92, 93, 95, 97, respectively, urging the middle plate 14 in the direction of arrow 125 in FIG. At the same time, the cams 64,66 are rotated and are gripped in the rectangular openings 120,122 of the supports 32,33.

As a result, the top plays 1 and 16 are urged in the opposite direction indicated by the arrow 126.

FIG. 14 shows the orientation of cam 64 relative to top plate 16 when actuator 18 is in the open position. Because the middle plate 14 and the top plays 1 and 16 are arranged in this manner, the wall 108 of the middle plate 14 urges the ears 44 of the brongs 40 in the direction shown by the arrow 125, and the protrusion of the top plate 16 The portion 121 urges the ear 46 of the blong 42 in the direction shown by arrow 126.

In this way, the brongs 40, 42 are biased in opposite directions, and the electronic component is forced onto the lead terminal contact surfaces 50, 42 of the brongs.
54.

Therefore, in the method for inserting the lead terminal of an electronic component described above, the electronic component can be inserted into the lower socket 10 without applying force, and the electronic component can be inserted without applying stress to the base member 12, middle plate 14, and top plate 16. can be retained.

After inserting the lead terminal of the electronic component between the brongs 40.42, the actuator 18 is returned to its original position, shown in solid lines in FIG. 2, in order to close the brongs 40.42. Because the brongs 40.42 have spring-like properties, the bent brongs 40.42 grip around the lead terminals of the electronic component, and the two are mechanically and electrically connected. As each brongs 40 tend to return toward the closed position, middle plate 14 is urged back to its original position as shown in FIG. The top plate 16 has cams 64.6 abutting the ends of the square openings 120.122.
6 returns it to its original position.

Therefore, the tube brakes 1-16 continue to move or are moved by the cams 64, 66 of the cam rod 58.

Although the socket 10 is configured to have an array of 10XIO openings, the present invention can have any size or shape, and may also have various shapes or shapes to which IC components having various lead terminals can be attached (↓ Applicable to sockets with any number of holes.

The embodiments described above are merely illustrative and do not limit the invention. Accordingly, the socket according to the invention may be implemented in any form without departing from the spirit and scope of the invention.

[Brief explanation of drawings]

The drawing shows an embodiment of the socket according to the invention,
FIG. 1 is a perspective view of the socket; FIG. 2 is a side view of the socket to show the relative movement between the top plate and middle plate as the actuator arm moves from the closed position to the open position; Fig. 3 is an exploded view of the socket with only one contact drawn, Fig. 4 is a plan view of the socket, Fig. 5 is a side view of the socket with a portion cut away, and Fig. 6 is an exploded view of the socket with only one contact drawn. Figure 7 is a sectional view taken along line 6-6 in the figure, Figure 8 is a sectional view taken along line 7-7 in Figure 3, and Figure 8 is 8-84 in Figure 3! JIF
i-side view, Figure 9 is a partial sectional view taken along line 9-9 in Figure 4, Figure 10 is
The figure is a partial sectional view taken along the line 10-10 in FIG. Figure 11 is a partial sectional view of the socket similar to Figure 9, but with the contacts in the open state; Figure 12 is an exploded view of Figure 9 with the contact portion omitted for clarity; Figure 13 is a partial sectional view taken along line 13-13a in Figure 1;
FIG. 14 is a partial cross-sectional view similar to FIG. 13 of the socket in the open position. 12...Base member 14...Middle plate 16...Top plate 18...Actuator 20...Contact 30...Guide rail 36...Legs 38...Heads 40, 42... Bronze 44.46...Ear 56...Arm 58...Cam rod 60...Handle portion 62...Body 64.66.68...Cam 70, 72.74.76...Cam surface 86, 106.114...Opening 92, 93.95.97...Flange 94 96
．． 98...notch 100...groove 122...protrusion

Claims (4)

[Claims] (1) A socket used for fixing an electronic component having a lead terminal to a conductor, which has three plates, a contact, first and second contact members, and a cam member, and includes the Each of the plates has a number of openings therethrough, and the openings are arranged to be vertically aligned when the plates are stacked adjacent to each other, and the contacts are located in the bottom plate. and each contact has a downwardly extending foot and laterally spaced upwardly extending first and second brongs, each of said contact feet being attached to said lowermost plate. and each of said first and second brongs extends upwardly into said opening through an intermediate plate and into a top plate, said top plate and said middle plate extending downwardly through said middle plate and into said top plate. When in the first position, each of the contacts connects a lead terminal of an electronic component to the opposing first position.
and a second bong, the first abutment member being attached to the intermediate plate, and when the intermediate plate is moved from the first position to the second position, the first abutting member is attached to the intermediate plate. an abutment member biasing each first brond of the contact away from the opposing second brong, the second abutment member being attached to the top plate; The intermediate plate is the first plate.
When moved from the position to the second position, the second abutment member urges each second brond of the contact in a direction away from the opposing first brond, and the cam member is movable from a position to a second position, the top plate and the middle plate are moved relative to and with respect to the bottom plate to move the top plate and the middle plate relative to the bottom plate.
position to a second position, the opposing first and second brongs are urged into an open state so that the lead terminal of the electronic component can be inserted therebetween, and the cam member is moved to the second position. The socket is movable from a second position to the first position, the socket being adapted to move the top plate and the middle plate from the second position to the first position. (2) The first bong is provided with a biasing device that biases the intermediate plate toward the first position when the cam member is rotated from the second position to the first position. A socket according to claim 1. (3) The cam member is provided with a device that biases the uppermost plate toward the first position when the cam member is rotated from the second position to the first position. A socket according to claim 1. (4) a groove is formed in the intermediate plate, a rib corresponding to the groove is formed in the lowermost plate, the rib is slidably received in the groove, and the intermediate plate 2. The socket of claim 1, wherein said intermediate plate and said lowermost plate are prevented from shifting when moving between said first and second positions.