JP3059562B2 - Device for correcting bending of linear bodies - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for correcting a bending of a linear member such as a lead of a semiconductor package which is easily deformed by an external force.

[0002]

2. Description of the Related Art When an external force exceeds a certain value when an external force is applied to deform an object, permanent deformation remains even after the external force is removed. In contrast to the elastic deformation that completely returns to its original shape after removing external force, this is called inelastic deformation.
formation). Inelastic deformation occurs at the same time as the load changes (instantaneous) plastic deformation
And time-dependent viscous deformation. Deformation at room temperature can generally ignore the effect of viscosity, but materials used at high temperatures undergo viscoplastic deformation that increases with time.

[0003] Although not particularly limited, the leads of a semiconductor package are susceptible to various external forces during the manufacturing process, transportation or handling, and it is difficult to maintain a desirable lead shape (generally a straight shape) as a product. FIG. 6 shows a semiconductor package of a type called a glass terminal in which a lead 3 is attached to a hole of a stem 1 via an insulating glass 2. In this type of package, particularly, a gold plating process is applied to the stem 1 and the lead 3. When applied, the lead is likely to bend. In the plating step, for example, as many as 3,000 packages are placed in a barrel (cage) and processed at once, so that undesired external force is applied to the leads due to collision of the packages or contact of the cage. It is.

[0004] As a jig for correcting such a bend to obtain a desired shape, for example, a jig as shown in FIG. 7 is known. In this jig, a large number of deep holes 5 are formed in the end surface of a cylindrical solid body 4 and a taper 6 having a predetermined angle θ is formed in the opening of the deep hole 5. When this jig is applied to the semiconductor package of FIG. 6, for example, the number of the deep holes 5 is made equal to the number of the leads 3 and the arrangement of the deep holes 5 is the same as the arrangement of the leads 3. All the leads can be corrected at once by applying the end face of the jig to the lead end and inserting it.

[0005]

However, in such a conventional jig, all the lead ends need to contact the taper 6 when the end face of the jig is brought into contact with the leads. The lead deformation exceeding the angle θ is practically impossible to correct, and has a problem that it has to rely on manual labor.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to perform a correction irrespective of the amount of deformation of a linear body, and to efficiently correct a lead of a semiconductor package, for example.

[0007]

The present invention achieves the above object by applying an external force as shown in FIG.
In a virtual plane perpendicular to the axis of a given linear object
The linearly with horizontally moved, closest to the linear body at a predetermined point of the on the horizontal movement path <br/>, said linear with said predetermined fixed point
A moving body that moves up and down on a path along the axial direction of the body, and an arm having a length (L) corresponding to the closest approach distance,
One end of the arm is connected to the moving body so as to be able to turn or swing around the horizontal moving path of the moving body, and the arm has a shape substantially matching the shape of a part of the outer peripheral surface of the linear body . Holder with inner peripheral surface
A holding body is fixed to the other end of the arm, and the linear body
The movable body comprises two relative, and the movement of the two said
The horizontal movement path of the body is separated by a distance (2L + D) obtained by adding a value corresponding to the cross-sectional diameter (D) of the linear body to a value obtained by doubling the closest approach distance at the predetermined point. .

[0008] or, is moved up and down the linear body in the path along the axial direction of the linear body, and wherein the causing relative vertical motion between the moving entity and the linear body . that's all

[0009]

In the present invention, first, the moving body 14 is moved along the horizontal movement path 12 with the arm 15 turned (see the broken line in FIG. 1). When the arm 15 is turned backward in the approaching position, the linear body 10 is gripped by the inner peripheral surface 17a of the gripping body 17 (the solid line in FIG. 1 indicates this gripping state). When the moving body 14 is moved up and down in this state, or when a relative vertical movement is caused between the linear body 10 and the moving body 14, the linear body 10 is moved along the moving direction. Is corrected.

The horizontal movement path 12, that is, the virtual plane 11,
It is desirable to set the linear body 10 at a position where the bending is small, for example, at the base of the linear body 10 or at a position close to the base.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 to FIG. 5 are views showing an embodiment of the device for correcting the bending of a linear body according to the present invention, and are examples applied to lead bending of a glass terminal. First, the configuration of the main part will be described. FIG.
In the figure, reference numeral 20 denotes one lead as a representative, and the lead 20 is made of a soft metal and is a predetermined linear body which is easily deformed plastically by an external force.

Numeral 21 denotes a correction pin (corresponding to a moving body described in the gist of the invention), and a tip of the correction pin 21 has a part (half circumference) of an outer peripheral shape of the lead 20 as shown in detail in FIG. One set of curved surfaces (corresponding to the inner peripheral surface and the gripping body described in the gist of the invention) 21a having substantially the same shape as the outer peripheral surface) is formed.
Is provided at a predetermined distance L (corresponding to the length of the arm described in the gist of the invention) from the shaft 21b.

The shaft 21b is rotatably and slidably supported by the base 22, and is connected to a first linear actuator 24 via a gear shaft 23. That is,
The correction pin 21 can be moved linearly in the direction of its axis 21b by the first linear actuator 24.
The shaft 21b corresponds to the horizontal movement path described in the gist of the invention.

The gear 25 meshing with the gear shaft 23 is
It is rotatably supported by the base 22 and is connected to a second linear actuator 27 via an eccentric cam 26. That is, the correction pin 21 is capable of pivoting or oscillating (hereinafter, pivoting) about its axis 21b by the second linear actuator 27.

The base 22 serves as a reference for the linear movement and the turning movement of the correction pin 21, and can be moved in the axial direction of the lead 20 by a third linear actuator 28. That is, the base 22 can be moved in the vertical direction in the drawing, whereby the correction pin 21 can be moved up and down along the axial direction of the lead 20.
However, the vertical position when the correction pin 21 is linearly moved is a fixed position, and preferably, is a position having a height at or near the root of the lead 20. That is, this fixed position is a position corresponding to the height of a virtual plane orthogonal to the axis of the lead 20.

The horizontal position of the correction pin 21, that is, the position of the correction pin in a plane perpendicular to the axis of the lead 20, is determined by the line extending from the axis 21b of the correction pin 21 and the lead 2.
0 is closer to the outer peripheral surface than the shaft 21b and the curved surface 21a.
Is set in advance to be substantially equal to the distance L between This can be freely adjusted by moving the horizontal mounting position of the base 22.

Next, the operation will be described. FIG. 4 is a diagram showing a correction operation using a plurality of correction pins (six of them are shown) corresponding to the number of leads (here, ten) of the glass terminals. Hereinafter, each of the correction pins 21 is identified by attaching reference numerals A to F. Although not shown in the drawing, all the correction pins are provided with the mechanism shown in FIG.

In the case of a glass terminal, all correction pins A
F are arranged radially and adjacent leads 20
So that it passes almost in the middle of. The five correction pins A to E shown in FIG. 4 are in a state before horizontal movement, and one correction pin F is in a state after horizontal movement by the first actuator. Are directed in the axial direction of the lead 20.

After the horizontal movement of all the correction pins A to F, the correction pins are moved by approximately 90 degrees by the second actuator.
Is turned, all the correction pins A as shown in FIG.
To F contact the outer peripheral surface of the lead 20. As is apparent from FIG. 5, almost the entire circumference of the lead is surrounded by the two curved surfaces 21 a opposed to each other with one lead interposed therebetween.

That is, the number of correction pins located on both sides of the lead is two, and the axis of the two correction pins at the position after the movement has a value obtained by doubling the closest approach distance L to the value of the lead. They are separated by a distance 2L + D obtained by adding a value corresponding to the sectional diameter D. In this state, when all the correction pins A to F are moved up and down, a contact force is applied to all the leads with the up and down movement. When the direction of movement does not match the lead shape, that is, when the lead is bent, plastic deformation occurs due to a large contact force (external force) acting on the deformed lead, and the bending is corrected.

As described above, in this embodiment, after the correction pin is moved closer to the root of the lead or a position near the root (linear motion), the curved surface is brought into contact with the outer peripheral surface of the lead by the turning motion of the correction pin. By making contact and then moving the correction pin up and down, the bending of the lead can be corrected. According to this, even if the bend is large enough to contact the tips of the leads, for example, there is almost no or very little bend at the root or near the root of the lead. Can be easily performed, and such a large bending can be easily corrected by the subsequent vertical movement.

The embodiment is an example of application to a semiconductor package having a plurality of leads arranged in a circle.
The present invention is not limited to this, and can be applied to other semiconductor packages having a plurality of leads arranged linearly or in a curve. Alternatively, it is needless to say that the present invention can be applied to one lead. In addition, as a linear object to be corrected, it is needless to say that the present invention can be applied not only to the leads of the semiconductor package described above, but also to various types of linear objects that can be bent by plastic deformation.

[0023]

According to the present invention, the correction can be performed irrespective of the amount of deformation of the linear body, and for example, the lead correction of the semiconductor package can be efficiently performed.

[Brief description of the drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a conceptual diagram of a mechanism of a main part of one embodiment.

FIG. 3 is a detailed view of a correction pin according to one embodiment.

FIG. 4 is a diagram showing a state before and after a linear movement of a correction pin according to an embodiment;

FIG. 5 is a state diagram of a turning motion according to one embodiment.

FIG. 6 is an external view of a glass terminal.

FIG. 7 is a front view of a conventional correction jig and a cross-sectional view taken along the line AA 'of FIG.

[Explanation of symbols]

 10: Linear body 11: Virtual surface 12: Horizontal movement path 13: Path 14: Moving body 15: Arm 17: Grasping body 17a: Inner peripheral surface

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 50-149969 (JP, A) JP-A 55-61051 (JP, A) 173153 (JP, U) Japanese Utility Model Showa 62-152427 (JP, U) Japanese Utility Model Showa 63-55499 (JP, U) Japanese Utility Model Utility Model Hei 2-9448 (JP, U) (58) Field surveyed (Int. ⁷ , DB name) H01L 23/50

Claims (2)

(57) [Claims] 1. A predetermined linear body for correcting bending by applying an external force.
A horizontal movement in a virtual plane orthogonal to the axis of the linear movement, and a closest approach to the linear body at a predetermined point on the horizontal movement path, and a path along the axial direction of the linear body at the predetermined point a moving body moves up and down above the arms and having a length corresponding to the closest distance (L), comprising a pivot or swingable horizontal movement path of the moving body as an axis, one end of said arm Is connected to the moving body, and the shape of the linear body substantially coincides with a part of the outer peripheral surface .
A gripping body having a peripheral surface is fixed to the other end of the arm , and two moving bodies are provided with respect to the linear body , and a horizontal moving path of the two moving bodies is An apparatus for correcting a bending of a linear body, wherein the fixed point is separated by a distance (2L + D) obtained by adding a value corresponding to a cross-sectional diameter (D) of the linear body to a value obtained by doubling a closest approach distance. 2. A linear body said linear body on the path along the axial direction of the
The moved vertically, bending correction device of the linear body relative claim 1, wherein causing a vertical movement between the moving entity and the linear body.