JPS62260685A - Package of electronic part with large number of pin - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to packages for electronic components such as ICs that have a large number of pin-shaped connection terminals and are easily susceptible to electrostatic damage, The present invention relates to a packaging body suitable for individually packaging parts of.

[Conventional technology]

For packaging electronic components such as ICs that have a large number of pin-like pins, molded containers made of hard magazines that match the shape of the pins are often used. However, these containers are made to fit individual parts with specific shapes, and are not suitable for packaging small quantities of parts of various shapes. When packaging items of various shapes in small quantities, soft pouches are used, but pouches have the drawback of being easily torn by pins and lacking in cushioning properties. In addition, it was common for end users to stick component pins into small pieces of conductive foam and wrap them in aluminum foil, but aluminum foil is expensive, opaque, and does not allow the contents to be seen. There were drawbacks such as the manufacturer's responsibility being unclear because it could not be identified even if the page was packaged after being unpacked.

[Problem that the invention seeks to solve]

The present invention has been made in order to improve the current state of affairs as described above, and it is possible to protect a large variety of parts in small quantities from static electricity and external mechanical forces, and to make it possible to identify them from the outside while individually packaged. The object of the present invention is to provide a package that does not require unwrapping and can be distributed to users without any errors in the state it was packaged by the manufacturer.

(Means for solving problems) The above objective can be achieved by the following means.

A small piece of plastic foam sheet with a surface electrical resistivity of 107 ohms or less, or a small piece of a laminated foam sheet made by laminating a conductive film with a surface electrical resistivity of 107 ohm or less on a Plusdec foam sheet, has a surface electrical resistivity of 107 ohm. The pins of electronic components are inserted into the following surface to electrically connect the pins to fix the component and the foam, and the surface is further covered with a transparent conductive film with a surface electrical resistivity of 1010 ohms or less. Coat the surface. In this case, the film is not made into a bag in advance, but is wrapped in a cylindrical shape around the outer circumference of a small piece of foam to which the parts are fixed using pins.
Take measures to prevent the tube from unraveling.A package in which both ends of a cylindrical film are twisted to prevent it from unraveling is particularly desirable as it is simple and inexpensive. In addition, a package that is wrapped into a cylindrical shape and heat-sealed at both ends can be used as a cylindrical package.
This is particularly useful for the purpose of clarifying the liability of the manufacturer, as it will no longer be possible to repackage using the product. In addition, in all of the above packaging bodies, the longitudinal film seams of the cylinder are simply overlapped without heat sealing, so the packaging is flexible and can be wrapped in one piece, and when the film is subjected to external force. has the advantage of being less likely to be damaged. In addition, it is particularly desirable that the foam has a rectangular shape with obtuse corners or rounded corners, since this reduces the concentration of excess force on the exterior film. In addition, in a package in which a heat-shrinkable film is used to create a twisted or heat-fused package as described above, and the film is further heated to shrink the film, the film adheres to the surface of the part and the part This makes it easier to see through the text on the surface, improves the appearance, reduces excess volume of the package, and improves efficiency.Furthermore, when it is interleaved, it can no longer be packaged with the same material 1 again. This is especially desirable since it has the advantage of making it possible to clarify the responsibility of the manufacturer.

The foam sheet used in the present invention is a foam sheet of polyurethane, polyethylene, etc. in which a conductive filler such as carbon black is dispersed, or a laminated foam sheet with a conductive film laminated on the surface. The surface electrical resistivity of the sheet surface to be pierced with a pin must be 107 ohms or less, and if it is not, a spade or 1 is used as a sufficient protective circuit even if the pin is pierced. The thickness of the foam sheet is preferably slightly thicker than the length of the pin, and for parts with 5 mm pins, the thickness of the foam sheet is preferably about 6 to 10 mm. The size of the foam piece is preferably such that when one or several parts are fixed side by side, there is a surplus of about 3 to 10 mm at the outer edge. It is advantageous to cut the foam pieces into rectangular shapes, as this will result in a nearly rectangular package; in particular, cutting the corners at obtuse angles or rounding them will improve the finished shape of the twisted package. In the case of a package other than a twist, the package is less likely to be damaged at the corners, which is particularly desirable. As for the material of the foam, foams made of various resin compounds other than those exemplified above can be used, but soft to semi-rigid foams are preferable. The film must have a surface electrical resistivity of 1010 ohms or less,
Must be transparent. If the resistance is less than 1010 ohms, the contents cannot be sufficiently protected from the effects of static electricity applied from outside the package. A particularly desirable film for this packaging comprises a plastic film with a thin layer of conductive paint containing carbon black and a binder on the surface, and a thin protective layer on top of that. There is a transparent conductive film (Japanese Unexamined Patent Publication No. 60-214945). This product can have a surface electrical resistivity of 1010 ohms or less, and the protective layer provides good surface slippage, making it easy to package and prevent carbon from falling off.
This method is particularly desirable for obtaining heat-shrinkable packages because there is no need to worry about contaminating the packaged objects, and when a heat-shrinkable film is used as a base material, a conductive heat-shrinkable film can be obtained. It has the following characteristics. Also, by vapor deposition, etc., the metal is made extremely thin to the extent that the metal can be seen through a thin base film such as a polyester film or a polypropylene film]
A coated conductive film and a conductive film coated with a thin layer of protection on the metal can also be suitably used.

The surface electrical resistivity was measured by the following method.

Prepare a rectangular sample with a width of 10 m and a length of 30 m or more, and place it at right angles to the flat sample with an interval of 10 mm.
Two rectangular conductive rubber electrodes are brought into contact, the resistance between the electrodes is measured, and this value is calculated from the 10#
It was defined as the surface resistance of a 0# square, that is, the surface electrical resistivity.

〔Example〕

The present invention will be explained below with reference to Examples.

Example 1 A conductive paint containing carbon black was coated on one side of a polyethylene foam sheet with a density of 0.03 kg/lack and a thickness of 6 M, and a biaxially stretched polystyrene film with a thickness of 16 microns, and then Acrylic resin protection containing polyethylene wax as a lubricant] A laminated foam sheet laminated and bonded with a conductive film having a surface electrical resistivity of 8 x 4 ohms and subjected to -1~ was 25 mm wide,
Cut into rectangles 50mm long. Next, this corner was lowered by 11 mm, and the main body 12 mm
A DTP-shaped IC with a diameter of 32 mm and a thickness of 4 square meters and having 2 rows of 24 pins with a length of 5 sides is fixed by inserting the pins into the center of the rib. This is coated on one side of a biaxially stretched polystyrene film with a thickness of 16 microns with an extremely thin layer of conductive paint containing carbon black, and then an acrylic resin-based protection containing polyethylene wax as a lubricant is applied on top of it.
1. A transparent conductive film with a surface electrical resistivity of 6 x 105 ohms, coated with The foam piece was wrapped in a cylindrical shape with a film at approximately the center of the film, and both ends were wrapped with rice 1-seam to obtain a package as shown in FIGS. 1, 2, and 3.

The IC was circuit-protected by placing a pin (2) on a laminated conductive film (4), was further protected from an electrostatic field around the periphery by a conductive film (3), and was buffered by a foam (5). T
The letters on side C were easily discernible from outside the package, so there was no need to open the package for confirmation. Twist part (
6) had the effect of preventing the conductive film (3) from unraveling and of buffering against external forces from the lateral direction.

Example 2 The dimensions of the conductive film of Example 1 were 70#X7
After wrapping the product in a cylindrical shape with a film as 0M, both ends were heat-sealed to obtain a package as shown in FIGS. 4 and 5.

Example 3 A stream of heated air at 120'C was applied from above the packages of Examples 1 and 2 for a short period of time to shrink the film on the top surface of the packages. After shrinking, the packaging became easier to identify characters and had an improved aesthetic appearance. In addition, after the both ends of the package were shrunk, the rice portion could no longer be unraveled without tearing the film.

〔Effect of the invention〕

As explained above, the package of the present invention is a package that combines a specific conductive foam sheet and a specific transparent conductive film, and is designed to prevent short circuits between terminals and shield external electrostatic fields in order to prevent electrostatic damage. Protects the packaged item from both sides,
Because it is a small-unit package and the inside can be checked without leaving the package, there is no need to unwrap the package until use, making the scope of the manufacturer's responsibility clear, and the packaging method is simple, making it suitable for packaging a wide variety of small parts. It has useful effects such as good cushioning properties and no need for extra care in handling.

[Brief explanation of drawings]

FIG. 1 is a side view of an example of the package of the present invention (Example 1). FIG. 2 is a cross-sectional view taken along plane a and a' of FIG. 1. FIG. 3 is a top view of the package shown in FIG. 1. FIG. 4 is a side view of another example (Example 2) of the package of the present invention. FIG. 5 is a top view of the package shown in FIG. 4. Patent Applicant Asahi Kasei Industries Co., Ltd. Agent Patent Attorney Kazuya Nozaki Figure 1 (1) IC body (2) Pin (3) Conductive film (4) Conductive film laminated on polyethylene foam (5)
) Polyethylene foam (6) Twisted end Figure 2 (fl (1) IC body (2) Pin (311 electric film (4) S electric film layered on polyethylene foam (5
) Polyethylene foam (7) Overlapping portion of ilX film Figure 3 (2) Pin (3) Conductive film (6) Twisted end (8) Laminated foam (9) Corner cut to make obtuse angle (io) Display characters on top of IC Figure 4 (1) IC body (2) Pin (3) Conductive film (4) Conductive film laminated on polyethylene foam (5
) Polyethylene foam (11) Heat-sealed end Figure 5 (1) IC body (2) Pin (3) Electrical film (8) Laminated foam (9) Corner cut to make obtuse angle (10 ) Indication characters on top of IC (11) Heat-sealed edges

Claims (1)

[Scope of Claims] 1. A small piece of a plastic foam sheet with a surface electrical resistivity of 10^7 ohm or less, or a small piece of a plastic foam sheet with a surface electrical resistivity of 10^7 ohm or less.
A small piece of laminated foam sheet laminated with a conductive film of ohm or less has a surface electrical resistivity of 10^7 ohm or less,
A large number of pins that are made by stably fixing the pins of an electronic component and individually covering the outer surface with a transparent conductive plastic film with a surface electrical resistivity of 10^1^0 ohm or less. A packaging body for electronic components. 2. The package according to claim 1, wherein the small pieces of the foam sheet are rectangular and have obtusely cut corners or rounded corners. 3. The package according to claim 1 or 2, characterized in that the film is wrapped around a small piece of a foam sheet secured by a pin of an electronic component, and the both ends are twisted. body. 4. Claim 1 or 2, characterized in that the film is wrapped around a small piece of a foam sheet that is fixed by pushing a pin of an electronic component, and the ends are heat-sealed. packaging. 5. Claim 3 or 4, characterized in that the film is shrunk by heating after twisting or heat-sealing.
Packaging as described in section.