JPH048545Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] This invention targets various tape cartridges in which the main body case is provided with a transparent window for visually checking the amount of tape wound on the built-in tape reel. is an improved version of a separate transparent plastic transparent plate.

[Background technology]

1 and 2 illustrate tape cartridges to which the present invention is directed, specifically tape cartridges for video. This is a device in which tape reels 3, 3 on which the tape 2 is wound are rotatably positioned in the case bottom wall 4 over respective drive shaft insertion holes 5, 5, on which the tape 2 is wound. It is fed out from one tape reel 3 to the front of the case and wound onto the other tape reel 3. Each tape reel 3 has flanges 7 and 8 above and below a tape winding core 6. The tape winding core 6 and the lower flange 8 are integrally molded from plastic, and the upper flange 7 is molded separately from a transparent plastic material. is later caulked to the tape winding core 6 by ultrasonic welding.

Transparent windows 1 are provided on the left and right sides of the upper wall 9 of the main body case 1.
0 and 10, and the amount of winding of the tape 2 on each of the left and right tape reels 3 can be seen through the transparent windows 10 from the outside. The upper flange 7 of each tape reel 3 is made transparent so that the amount of tape wound onto the tape winding core 6 can be seen through.

As each transparent window 10, an opening 11 is transparently provided in the corresponding part of the upper wall 9 of the case, and a separate transparent plate 12 made of transparent plastic is prepared to close the opening 11. Generally, the inner peripheral edge of the opening 11 is provided. The outer peripheral edge of the transparent plate 12 is fixed to the.

The present invention deals with the plastic transparent plate 12 constituting the transparent window 10 in this type of tape cartridge having the transparent window 10.

That is, the transparent plate 12 is provided with a scale for displaying the amount of tape wound on the tape reel 3, that is, the remaining amount of tape corresponding to the recording time.
It is desirable for the scale 13 to protrude from the smooth surface (inner surface or outer surface) of the transparent plate 12, as shown in FIG. 3, for ease of viewing. In many cases, several linear scales 13 are usually arranged in parallel at predetermined intervals along the tape winding diameter.

However, if the scale 13 is provided protrudingly on the transparent plate 12, it is advantageous after assembly, but the transparent plates 12 may not touch each other as shown in FIG. 5 during transportation or assembly of parts before assembly. When stacked, the scale 13 scratches the surface of the other transparent plate 12. In particular, if the scale 13 is scratched on the surface opposite to the protruding part, the scale 13 becomes difficult to see, and in reality, a considerable number of transparent plates 12 are discarded in advance as defective products due to scratches, or are not assembled. The tape cartridge itself was discovered after it was installed and disposed of.

[Purpose of invention]

From this point of view, this invention targets a transparent window 10 in which a scale 13 is protruded from one side of the front and back, and the scale 13 does not damage the other side of the transparent window 10, especially the part corresponding to the scale 13. The main purpose is to make the scale 13 easy to see by making it difficult to stand out even if it is scratched.

[Summary of the idea]

In order to achieve the above object, in the present invention, a scale 13 is provided protrudingly on one side of the transparent plate 12, and a fine uneven pattern is formed to appear on a portion of the other side that approximately corresponds to the scale 13.

Here, the minute unevenness pattern is the so-called satin pattern,
It is typified by concepts such as grain patterns and granular patterns, and refers to a surface morphology in which fine irregularities are formed.

In order to reduce the molding cost, it is preferable that the fine unevenness pattern be formed simultaneously and integrally with the mold for forming the transparent plate 12, but it may also be formed using a press mold, a roll, etc. after forming the transparent plate 12. .

In concrete implementation, even if the scale 13 is on the back surface of the transparent plate 12 (the surface facing inside the case) and the outer surface has a minute uneven pattern, the scale 13 can be easily seen from the outside, and furthermore, it is possible to make the scale 13 easy to see from the outside. Every detail has been taken into consideration to make it easy to use. These details will become clear in the following embodiments.

〔Example〕

The basic configuration of the tape cartridge itself has already been described, and to explain only the main points, in FIGS. 3 and 4, the transparent plate 12 has a scale 13 on the inside surface facing into the case when it is installed. It will be done.

The scales 13 are integrally formed as longitudinal linear protrusions protruding from the smooth surface of the transparent plate 12, and are located at the front and rear center of the transparent plate 12 and are arranged at predetermined intervals in the left-right direction. In the figure, a total of six scales 13 are included assuming a 6-hour video recording, and the outer circumference of the rolled layer 3a of the tape 3 is on the transparent plate 12 corresponding to the tape reel 3 on the right side of the figure When one scale 13 reaches adjacent scales 13 on the center side, it means that the remaining tape capacity has decreased by one hour of recording.

In the center between adjacent linear scales 13, 13, a dotted scale 14 is also integrally provided on the back side of the transparent plate 12, so that the remaining amount of tape in units of 30 minutes can be visually recognized.

When the scales 13 and 14 of the transparent plate 12 are inserted, these scales 13 and 14 are placed on the outer surface of the opposite side.
A fine unevenness pattern 15 is formed to appear between the left and right sides at the front and rear center portions corresponding to the left and right sides. The fine unevenness pattern 15 in the illustrated example is formed in a segmented manner and traverses above the linear scale 13, but is not formed above the dotted scale 14. The area shown by pointillism in FIG. 3 and between the arrows in FIG. 4 is where the minute unevenness pattern 15 is formed.

The exposed portion of this minute unevenness pattern 15 is located on the transparent plate 12.
protrudes slightly from the smooth surface of the When it is made to protrude in this way, it is advantageous to form a finely uneven surface in a small area by electrical discharge machining on the mold surface corresponding to the pattern portion during processing of the molding mold,
Even after forming the transparent plate 12, when a large number of transparent plates 12 are stacked as shown in FIG. The protruding scales 13 and 14 of the transparent plate 12 make the entire outer surface of the other transparent plate 12 less susceptible to damage.

In the illustrated example, if the part of the minute unevenness pattern 15 becomes translucent and the linear scale 13 on the inner surface side is completely covered, it becomes difficult to see, so the front and rear width of the uneven pattern 15 is determined by the linear scale 13 before and after this. It is set so that both ends are exposed.

In FIG. 4, the outer peripheral edge portion 16 of the transparent plate 12
The upper surface of the case is formed into a step-like shape, and a protrusion 17 is integrally formed on the step-like upper surface of the outer peripheral edge portion 16 in a segmented manner. Guide the transparent plate 12 from the inner side of the case.
The main body portion was fitted into the opening 11, and the outer peripheral edge portion 16 was fixed to the inner peripheral edge of the opening 11 via the protrusion 17 by ultrasonic welding.

Note that the left and right center portions of a plate spring 19 made of a diamond-shaped steel plate in plan view are fixed to the inner surface of the case top wall 9, and both free ends 19a, 19a of this plate spring 19 are part of the left and right transparent windows 10, 10. The center of rotation of each tape reel 3, 3 is pushed down and biased. Therefore, the outer surface of the transparent plate 12 is integrally provided with a matte pattern 20 (substantially the same as the minute unevenness pattern 15) for masking each free end 19a of the leaf spring 19 so that it cannot be seen from the outside. It has been formed.

[Modified example]

Although the illustrated example is as described above, the present invention is not limited thereto.

For example, it goes without saying that the minute unevenness pattern 15 is not intended to hide the scales 13 and 14. Therefore, when the minute unevenness pattern 15 still has sufficient transparency, it may completely cover the scales 13 and 14 in plan view. In any case, the minute unevenness pattern 15 may be in the form of a continuous band.

Moreover, although the linear scale 13 and the dotted scale 14 are shown as scales in the figure, either one of them may be used, and the number thereof can be selected as necessary.

Furthermore, the transparent plate 12 is opened in the opening 1 of the main body case 1 in a state in which a scale represented by the reference numeral 13 is inserted on the outer surface side, that is, in a state in which the top and bottom are reversed from the above embodiments.
1 may be installed. The transparent plate 12 can also be fixed to the main body case 1 using adhesive or other suitable means.

In addition, when the case is intended for a video tape cartridge, the transparent window 10 may be provided at one central portion of the upper wall 9 of the case. of course,
The present invention also covers so-called Phillips-type tape cartridges for audio that can be used upside down. It will probably consist of only the tape winding core 6 without the upper and lower flanges 7 and 8.

[Effect of idea]

As explained above, in the present invention, the scale 13 for displaying the tape winding amount is integrally formed on one side of the transparent plate 12 made of plastic, and the scale 13 for displaying the tape winding amount is formed on the other side.
A minute unevenness pattern 15 was molded to appear in a portion approximately corresponding to the protruding position of No. 3. Therefore, even if the transparent plate 12, which is an assembly part after molding, is stacked one on top of the other during transportation or assembly into the main body case 1, as shown in FIG. 5, the edge of the scale 13 will be directly behind it. Since it comes into contact with the fine unevenness pattern 15, unlike the case of a smooth surface, the exposed portion of the pattern 15 is unlikely to be scratched, and even if it is scratched, it is not noticeable. As a result, it is possible to eliminate the defective products of the transparent plate 12 due to scratches, and the user can also conclude that the scale 13
The effect of making it easier to see is great.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an example of a tape cartridge to which the present invention is applied, Fig. 2 is a cross-sectional view taken along the line - - in Fig. 1, Fig. 3 is a plan view of the main parts, and Fig. 4 is Fig. 3. FIG. 5 is a partial longitudinal sectional perspective view of the stacked transparent plates, which are one of the constituent members of the present invention. 1...Main case, 2...Tape, 3...Tape reel, 9...Top wall of main body case, 10...
Transparent window, 11...opening, 12...transparent plate, 13,
14...Scale, 15...Minute uneven pattern.

Claims (1)

[Claims for Utility Model Registration] (1) The main body case 1 has a tape reel 3 on which the tape 2 is wound, and there is a transparent window 10 on at least the upper wall 9 of the main body case 1 for visually checking the amount of tape wound on the tape reel 3. In the tape cartridge, the transparent window 10 is constructed by fixing a transparent plate 12 made of transparent plastic to the periphery of an opening 11 formed through the upper wall 9 of the case.
It can be seen that a scale 13 is provided protrudingly on one side of the transparent plate 12, and a minute unevenness pattern 15 is formed on the other side of the transparent plate 12 at a portion approximately corresponding to the protruding arrangement of the scale 13. Features a tape cartridge. (2) Transparent plate 12 with scale 13 facing inside main case 1
2. The tape cartridge according to claim 1, wherein the scale 13 is formed on the back surface of the tape cartridge, and the minute unevenness pattern 15 allows the scale 13 to be seen through. (3) The tape cartridge according to claim 1 or 2, in which the minute unevenness pattern 15 slightly protrudes from the smooth surface of the transparent plate 12.