JP3001281U - Carrier tape - Google Patents

Abstract

(57) [Summary] (Correction) [Objective] The present invention provides a carrier tape capable of efficiently recognizing the image of the components housed in the carrier tape. [Structure] This carrier tape has a large number of concave portions 3 provided in the tape main body 1, and only the inner surface of the concave portions 3 and the upper surface of the tape main body 1 around the concave portions 3 are measured by the surface roughness measuring method of JIS B 0601. It is characterized in that an uneven surface having a roughness Ra of 0.01 to 0.5 μm is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a carrier tape useful for storing and transporting a large number of various electric / electronic parts, precision instrument parts and the like.

[0002]

[Prior art]

 Magazines, trays, and carrier tapes have traditionally been used as packaging materials for the transportation and storage of the above-mentioned parts.However, due to their effective efficiency, ease of handling, and economic efficiency, today Carrier tapes are becoming the mainstream. In particular, electronic parts such as ICs of semiconductor devices (hereinafter referred to as parts) tend to be packaged with carrier tapes due to miniaturization and fine pitch. The carrier tape is made of a sheet made of thermoplastic resin such as polystyrene, polyvinyl chloride, polyester, polycarbonate, etc., and recesses for accommodating parts are formed by press molding, vacuum molding, vacuum pressure molding, etc. Things are being used. In using it, first perform a functional inspection of the electrical characteristics of the components to be stored, and a visual inspection such as the loss of the components or marking on the surface of the components, and then store the components in the recess of the carrier tape to prevent them from falling off. For this purpose, the top tape was coated and adhered to the upper surface of the recess. Before shipment, as final inspection, check the direction of parts, mixing of different types, manufacturing lots, presence or absence of marking, parts falling off, etc., especially for ICs, check for lead bending and floating. , Each was visually inspected. Since all of these visual inspections rely on the human sense, there are variations in determination results due to individual mistakes and individual differences, and it takes a lot of man-hours. For small parts such as narrow pitch ICs and 1005, Was virtually impossible.

[0003]

[Problems to be solved by the device]

 Therefore, in recent years, a method for labor saving has been developed by using an inspection device instead of the visual inspection, and among them, an image processing device using a CCD camera has become mainstream. However, since this image processing device irradiates light from the light source above the carrier tape toward the component, recognizes the image with the CCD camera and inputs the image to judge the quality of the component, as shown in FIG. As for the light source, the part a and the inner surface of the recess b accommodating the part a and its surroundings are also captured in the image as the visual field range S, and the part a is reflected on the inner surface of the recess b to form a virtual image c. . Further, as shown in FIG. 5, the component a receives the excess light due to the reflection of the light around the concave portion b, decomposes it, and it is difficult for the CCD camera to judge the quality. As a result, the CCD camera captures not only the reflected light of the component but also the virtual image, which makes it difficult to distinguish between the component or the component and its virtual image. The error was that even a good product was judged to be defective. In order to prevent this error, various measures have been taken to improve the accuracy by changing the position of the light source, adding the number of light sources, and changing the wavelength of light. It was difficult and complicated to change the case for each type of parts. Therefore, an object of the present invention is to provide a carrier tape capable of efficiently recognizing the image of the components housed in the carrier tape.

[0004]

[Means for Solving the Problems]

 As a result of diligent investigations by the inventors, a method of accurately determining only the state of a component by reducing the occurrence of a virtual image of the component and the reflected light of the component has been investigated. If the surface roughness of the above part of the carrier tape is 0.01 to 0.5 μm in terms of Ra (center line average roughness) specified by the surface roughness measuring method of JIS B 0601, We have found that we can reduce the occurrence of virtual images and reflected light from parts, and arrived at the present invention. That is, the carrier tape of the present invention is a carrier tape in which a large number of recesses are provided in the tape body, and only the inner surface of the recess and at least the upper surface of the tape body around it are specified by the surface roughness measuring method of JIS B 0601. It is characterized in that an uneven surface having a roughness of 0.01 to 0.5 μm is provided with Ra. Furthermore, it is preferable that a top tape is adhered to the upper surface of the tape main body so as to cover the concave portion. And

Hereinafter, the embodiments of the present invention will be described in more detail with reference to FIGS. 1 to 3. FIG. 1 (a) is a perspective view showing a state in which parts are stored in the carrier tape of the present invention, a top tape is sealed on the upper surface, and the tape is wound into a roll for use in transportation and storage. FIG. 1B is a partially enlarged plan view of this carrier tape. Reference numeral 1 denotes a tape body of a carrier tape, which is provided with a large number of recesses 3 for accommodating the parts 2 individually in one row, and on one side thereof, small holes 4 for guiding the carrier tape. It is drilled in one row. The inner surface of the concave portion 3 and the upper surface of the tape body 1 around the concave portion 3 are 0.01 (Ra representing the center line average roughness measured by using a surface roughness meter) specified by the surface roughness measuring method of JIS B 0601. .About.0.5 .mu.m, preferably 0.03 to 0.3 .mu.m. Here, the inner surface of the concave portion 3 indicates the bottom surface and the side surface that form the large number of concave portions 3 provided in the tape main body, and the upper surface of the tape main body 1 is the inner surface of the concave portion 3 that seals with the top tape 5. Other than that, it shows a flat surface. As shown in FIG. 1 (a), the range of the uneven surface 6 may be the entire inner surface of the recess 3 ... And the upper surface of the tape body 1, or as shown in FIG. Only the upper surface of the tape body 1 around it may be used. Further, the tape body 1 may be only within the circular visual field range S of the CCD camera for image processing.

[0006] Samples 1 to 4 having different surface roughness measured by a surfcom (trade name, manufactured by Tokyo Seimitsu Co., Ltd.) according to the surface roughness measurement method of JIS B 0601 were prepared, and the results were measured by an image processing device. Is shown in Table 1. As a result, when the surface roughness is 0.01 to 0.5 μm, the glossiness is low, and it is possible to reduce the occurrence of virtual images of parts and the reflection of light from the parts during image processing. Therefore, it was found that an error might occur in image processing.

[Table 1]

A sheet made of a thermoplastic resin material such as polyester, polystyrene, polypropylene, polycarbonate, or polyvinyl chloride is used for manufacturing the carrier tape of the present invention, and the component 2 housed in the recess 3 is destroyed by static electricity. In the case where it is easy to remove, a conductive agent such as carbon black or metal powder is kneaded into these thermoplastic resin materials, or the surface of the sheet is coated with a conductive agent is used. . For this reason, the appearance of carrier tapes is often black and opaque, and in some cases black and semitransparent. The opaque type is more suitable for image processing than the semi-transparent type, but if the surface roughness is within the range of the roughness of the present invention, the semi-transparent type can easily perform image processing. If necessary, a top tape 5 may be provided on the upper surface of the tape body 1 so as to cover the recesses 3 ... After housing the components 2 ... It is glued. The top tape 5 preferably has a total light transmittance of 90% or more and a haze of 10% or less so that the stored components 2 can be seen through.

The carrier tape according to the present invention is generally manufactured by press molding, vacuum forming or vacuum pressure forming, and as shown in FIG. 2, the forming sheet 11 is previously introduced into a heating furnace 12 and heated. After being softened, it is molded into a predetermined shape using the mold 13. At this time, the recess 3 for housing the component 2 is formed by stretching the molding sheet 11 in any of the molding methods, so that the surface roughness in the recess 3 after molding has a desired value. Thus, it is necessary to provide the molding sheet 11 with an uneven surface. This will be explained using press molding as an example. In press molding, as shown in FIG. 3, since the recess 3 of the carrier tape is formed by the sheet suppressing member 15 and the convex plug 16, the side surface inside the recess 3 is formed. The forming sheet 11 is stretched. Therefore, if the uneven surface of the molding sheet is preliminarily processed to have a predetermined roughness in consideration of the change due to the elongation of the molding sheet 11, the surface is stretched during molding to have a desired surface roughness. Further, with respect to the bottom surface of the concave portion 3 and the upper surface of the tape main body 1 around the concave portion 3, the pressure molding surface 17 of the convex plug 16 in contact with the molding sheet 11 has a predetermined shape in consideration of a change due to transfer. If processed into a rough surface, these can be transferred at the time of molding to obtain a carrier tape having a desired surface roughness.

[0009]

[Action]

 In the carrier tape of the present invention, the inner surface of the concave portion and at least the upper surface of the tape body around the concave portion have Ra of 0.01 to 0.5 μm as defined by the surface roughness measuring method of JIS B 0601, so that the virtual image of the component is It is possible to reduce the occurrence of light and the reflected light of the component.

[0010]

【Example】

Hereinafter, specific embodiments of the present invention will be described with reference to Examples and Comparative Examples, but the present invention is not limited to the description of the Examples. Example 1 A 0.3 mm thick polyvinyl chloride sheet # 1378 BHR (trade name, manufactured by Shin-Etsu Polymer Co., Ltd.) was coated with a conductive mixture of Ketjenblack in a polyester or acrylic binder to give a surface roughness Ra. 0.15 to 0.2 μm was used as the sheet for molding, and the roughness of the press-molded product of the sheet restraining member and the convex plug was 3 to 5 μm, and the press molding was 12.9 mm in length and 12.9 mm in width. A carrier tape having a width of 24 mm and having a large number of recesses having a depth of 1.9 mm was molded. Surface roughness R _a of the carrier tape has become 0.07～0.10Myuemu, a 0.11~0.14μm the upper surface of the recess bottom surface and the tape main body in the recess inner surface. When QFP44P (quad flat package lead 44-pin) was inserted into the concave part of the carrier tape and the lead bending and lead floating were inspected using the image processing device, the quality of the product could be measured without any problem.

Comparative Example 1 The polyvinyl chloride sheet used in Example 1 was coated with the same conductive coat, and the surface roughness Ra: 0.7 to 0.8 μm was used as the molding sheet. Similarly, a carrier tape having the same dimensions as in Example 1 was molded by press molding. The surface roughness Ra of this carrier tape was 0.5 to 0.7 μm on the inner surface of the recess, and 0.6 to 0.7 μm on the inner bottom surface of the recess and the upper surface of the tape body. When a good product of the same QFP44P used in Example 1 was loaded into the concave portion of this carrier tape and inspected by an image processing apparatus, the lead of the QFP44P was bent and reflected on the side wall surface of the concave portion, and it was determined as a defective product.

Example 2 In Comparative Example 1 except that in press molding, a sheet pressing member having a surface roughness Ra of 0.4 to 0.8 μm up to 1 mm outside of the concave edge and the entire convex plug was used. Similarly, a carrier tape was molded. The surface roughness Ra of this carrier tape was 0.4 to 0.5 μm on the inner surface of the recess and 0.25 to 0.30 μm on the inner bottom surface of the recess and the upper surface of the tape body around the recess. When this carrier tape was used and inspected in the same manner as in Example 1, the quality of the parts could be measured without any problems.

Example 3 In press molding, the surface roughness Ra of the pressure molding surface of the sheet pressing member and the convex plug of only the visual field range S where the image can be recognized by the CCD camera around the recess of the sheet pressing member is 0.4 to. The carrier tape was molded in the same manner as in Example 2 except that the thickness was 0.8 μm. The surface roughness Ra of this carrier tape was 0.4 to 0.5 μm on the inner surface of the recess, and 0.25 to 0.30 μm on the bottom surface of the recess and the visual field range S in which an image could be recognized by the CCD camera. When this carrier tape was used and inspected in the same manner as in Example 1, the quality of the parts could be measured without any problems.

[0014]

Effect of the Invention When the surface roughness Ra of the carrier tape within the visual field range of image processing is 0.01 to 0.5 μm, image processing can be performed without problems regarding the quality of parts. This makes it possible to mechanize the work that has been performed by visual inspection, improve the measurement accuracy and save labor, and under the same conditions regardless of the type of carrier tape, the shape and type of storage parts, etc. Since measurement is possible, setup time can be shortened and complexity can be eliminated.

[Brief description of drawings]

1A and 1B show an embodiment of a carrier tape of the present invention, wherein FIG. 1A is an overall perspective view, and FIG. 1B is an enlarged plan view of essential parts.

FIG. 2 is a vertical cross-sectional explanatory view schematically showing the manufacturing process of the carrier tape of the present invention.

FIG. 3 is an end face explanatory view of a mold when the carrier tape of the present invention is manufactured by press molding, and (a) and (b) are different modes thereof.

FIG. 4 is an explanatory plan view showing generation of a virtual image in a concave portion of a conventional carrier tape.

FIG. 5 is a vertical cross-sectional explanatory view showing a reflection state of light at a concave portion of a conventional carrier tape.

[Explanation of symbols]

1 tape body, 2 parts, 3
Recesses, 4 ... Small holes for guiding, 5 ... Top tape,
6 ... Roughened part, 11 ... Molding sheet, 12 ... Heating furnace, 13 ... Mold, 14, 17 ... Pressure molding surface,
15: Seat restraint, 16: Convex plug. a: parts, b: concave portion, c: tape body, d: virtual image, S: visual field range.

Claims (4)

[Scope of utility model registration request] 1. A carrier tape having a tape body having a large number of recesses, in which Ra is 0.01 only on the inner surface of the recess and the upper surface of the tape body around the recess, which is defined by the surface roughness measuring method of JIS B 0601. A carrier tape having an uneven surface with a roughness of 0.5 μm. 2. A carrier tape having a tape body having a large number of recesses, having a Ra of 0.01 to 0.5 specified by a surface roughness measuring method of JIS B 0601 only in a visual field range S in which an image can be recognized by a CCD camera. A carrier tape having an uneven surface with a roughness of μm. 3. A carrier tape having a tape body provided with a large number of concave portions, wherein Ra defined by the surface roughness measuring method of JIS B 0601 is 0.
Carrier tape characterized by having an uneven surface with a roughness of 01 to 0.5 μm. 4. The carrier tape according to claim 1, wherein a top tape is adhered to the upper surface of the tape main body so as to cover the recess.