JPH02161673A - Manufacture of tape cartridge - Google Patents

Abstract

PURPOSE:To prevent a display part from being easily erased and to display it sharply and prominently by performing the secondary molding of the display part of a character and a symbol, etc., on a main body case with a plastic material with a color different from that of the main body case after performing the primary molding of the main body case by a dichroic molding method. CONSTITUTION:The primary molding of the main body case 1 is performed by combining an upper die 3 and a lower die 4 for primary molding and injecting the plastic material in the upper and lower dies 3 and 4. Next, the plastic material goes round to the corresponding part of the display part of the main body case 1 opened in a primary molding process by injecting the plastic material for secondary molding with the color different from that of the molding material of the main body case 1, then, the display part 2 is molded integrally with the main body case 1. As the color of the display part 2, the one different from that of the main body case 1 and which shows prominent visuality is selected. Thereby, the display part 2 can be prevented from being easily erased and becomes a permanent one, and also, it gives strong impression on the eyes of a viewer, thereby, calling attention.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a tape cartridge having display means such as an A-B side display and a tape running direction display.

[Conventional technology]

In tape cartridges, in general, characters, symbols, figures, etc., such as the letters rAJ rBJ displayed on the A-B side and the "triangle mark" indicating the tape running direction, are attached to the outer surface of the main body case. Labels are often pasted with a print on them, but labels have problems such as peeling off, fading, discoloration, etc. due to frequent contact with hands, and lack permanence. Particularly, the A-B side display and the tape running direction display are extremely important for use, and if these become unclear and cannot be read, errors are likely to occur.

Therefore, recently, important display items such as A-B side display and tape running direction display are stamped and molded by protruding or recessing the outer surface at the same time as the plastic main body case is molded.

[Problem to be solved by the invention]

However, since the letters and symbols formed on the surface of the main body case are the same as the color of the main case, they are unclear when viewed with the naked eye and have a weak ability to attract attention, so that the display effect cannot be expected to be very effective.

The present invention has focused on this fact, and aims to provide a method for manufacturing a tape cartridge in which display parts such as characters and symbols do not easily disappear and are clearly visible.

Further, the present invention aims at mass production.

[Means to solve the problem]

When manufacturing a tape cartridge, this invention firstly molds the main body case using a two-color molding method, and then secondary molds display parts such as characters and symbols on the main body case using a plastic material of a different color from that of the main case. It is characterized by

〔Effect of the invention〕

According to this invention, the display section 2 is integrally molded on the main body case 1 using a plastic material of a color different from that of the main body case 1, so that the display section 2 does not easily disappear and is permanent. Moreover, it makes a strong impression on the viewer's eyes, attracting their attention, and has a great design effect.

In addition, after primary molding the main body case 1 using the two-color molding method,
Since the display part 2 is continuously formed by secondary molding, the molding cycle is short and mass production is possible at low cost.

(Embodiment) An embodiment of the present invention will be described based on FIGS. 1 to 4.

Figures 1 and 2 show an example of a Phillips-type tape cartridge, the main body case 1 of which is a plastic molded product, with the letter "A" indicating sides A and B on the outer surface and the tape running direction indicating. A display part 2 such as a triangular mark or trademark letters is integrally molded using a plastic material different in color from the main case 1 by a two-color molding method.

A specific molding method will be described with reference to FIGS. 3 and 4. FIG. 3 shows the primary molding process, and FIG. 4 shows the secondary molding process. In FIG. 3, first, an upper mold 3 and a lower mold 4 for subsequent molding are combined, a plastic material is injected into the upper and lower molds 3, 4, and the main body case 1 is primarily molded. At this time, the insert 5 of the upper mold 3 is used to prevent the plastic material from going around the part of the main body case 1 where the display part 2 is to be formed. Next, after the main body case 1 of the next molded product is cooled and solidified, the upper and lower molds 3 and 4 are opened.

Then, after only the sprue and runner (not shown) of the next molded product are projected and discharged, the lower mold 4 is pivoted to be directly below the upper mold 6 for secondary molding, as shown in FIG.

In the secondary forming process, as shown in Fig. 4, the insert 7 of the lower mold 4 that has been rotated sinks downward by a predetermined amount until its upper end surface is flush with the lower surface 1a of the main body case 1 of the primary molded product. After that, the lower mold 4 and the upper mold 6 for secondary molding are combined.

By injecting a plastic material for secondary molding of a color different from the color of the molding material of the main body case 1 through the gate 8, the plastic material is transferred to the main body case 1 which has been opened in the primary molding process. The display part 2 is wrapped around the corresponding part of the display part, and the display part 2 is integrally molded with the main body game 1. Next, after the display section 2 is cooled and solidified, both molds 6 and 4 are opened, and the molded main body case is ejected and discharged from the mold together with the secondary side sprue and the runner. Finally, the lower mold 4 is pivoted again to be immediately below the upper mold 3 for primary molding. By repeating this series of operations, continuous molding of the main body case 1 becomes possible.

The color of the display section 2 is selected so that it stands out from the color of the main body case 1.

[Another example]

As shown in FIG. 5, the display portion 2 exposed on the outer surface Ib side of the main body case 1 may be molded and finished in a state slightly sunken below the outer surface 1b of the main body case 1. In such cases, the recess in the display section 2 allows the display contents to be understood by the touch of the hand, which is convenient when used in the dark, and is also suitable for blind people.

In addition, as shown in Fig. 6), the inner surface la of the main body case 1
The back surface part 2a of the display part exposed to the side is molded and finished in a slightly concave shape than the inner surface 1a of the main body case 1, so that the back surface part 2a of the display part does not protrude from the inner surface fa of the main body case 1, and can be used as a tape. This is advantageous in preventing damage to the tape.

Note that the display section 2 includes not only characters and symbols but also patterns and the like.

It goes without saying that the present invention is widely applicable to various types of tape cartridges such as microcentres and video tape cartridges.

[Brief explanation of the drawing]

Figures 1 to 4 show -11 of the present invention; Figure 1 is a plan view illustrating a tape cartridge to which the present invention is applied; ■−
Figure 4 is a cross-sectional view showing the primary forming process of the main body case; and Figure 4 is a cross-sectional view showing the secondary forming process of the body case. 5 and 6 are cross-sectional views at 9Pm of the tape cartridge nozzle showing seven different embodiments of the sword 11 of the present invention. 1...Body case, 2...Display section. -Written by Mao λ Sale City IF) December 1, 1999, Display of the case 1999 Patent Application No. 286088, August 2, Name of the invention Method for manufacturing tape cartridges 3, Person making the amendment Relationship with the case Patent application Address: 1-88 Ushitora-chome, Ibaraki City, Osaka Name (58)
1) Hitachi Maxell, Ltd. 4, Agent 8530
= (06) 312-4738 Address: 3-21, Suehiro-cho, Kita-ku, Osaka, Japan, June 16th, Contents of the amendment (11 The following words were added between page 2, line 16 and line 17 of the same page of the specification. Note [In this regard, a carved plate is produced by carving recesses in the shape of letters, etc. on a transparent resin plate, the four parts are filled with colored resin 1, and the carved plate is inserted into the transparent resin plate. A transparent name plate integrally embedded inside a transparent molded body made of the same type of resin is known from Japanese Utility Model Publication No. 38-15569.According to this, while characters etc. can be clearly seen, the engraved plate is In addition to manufacturing, filling processing with transparent resin is required.Furthermore, embedding the sculptural plate in the transparent molded body increases the number of man-hours and is disadvantageous in terms of mass production and manufacturing costs. When the manufacturing technology is applied to the molding of the main body case of a tape cartridge, the thickness of the case is so thin that it cannot be used as is." (2) "Also...・" to the second line of the same page, "...The purpose is.-1" is amended as follows. The purpose is to achieve this goal.]

Claims (1)

[Claims] 1. A step of primary molding the main body case (1) using a two-color molding method, and displaying characters, symbols, patterns, etc. on the main body case (1) using a plastic material of a different color. A method for manufacturing a tape cartridge, comprising the step of integrally forming part (2).