JPH04318380A - Tape cassette - Google Patents

Abstract

PURPOSE:To improve a tape running accuracy by integrating all of a tape guide system inside of a tape cassette into one body. CONSTITUTION:In the tape cassette provided with a guide block 8 guiding a tape T passing through the front opening part 7, within a cassette chassis constituted of an upper half 1 and lower half 2, a circular arc facial guide part 14 and pin-shaped guide part 15 which are respectively corresponding to a guide roller and guide pin of a conventional tape cassette, are integrally formed at both ends of the guide block 8.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a tape cassette.
This particularly concerns the structure of the internal tape guide system.

0002

[Prior Art] In conventional tape cassettes, the tape path system around the front opening into which the magnetic head etc. is inserted is made of parts made of a different material from the cassette half to reduce friction, provide vibration isolation, and improve the running path. There is a method that aims to improve the accuracy of the data and thereby reduce modulation noise.

The structure of a conventional tape cassette of this type will be explained with reference to FIGS. 5 and 6. In the figures, 1 is an upper half, 2 is a lower half, and the upper half 1 and the lower half 2 are combined to form a A cassette case is constructed by fixing with screws 3 at several locations. A pair of reel hubs 4 on which a magnetic tape T is wound are rotatably housed inside the cassette case. It is led out to the front opening 7 via a rotatably supported guide roller 6.

This front opening 7 is provided with a magnetic head 20 and a pinch roller 2 from the recording/reproducing apparatus side during tape recording/reproducing.
1 is inserted, a guide block 8 is positioned inside the front opening 7 and is fixedly disposed so as to be sandwiched between the upper and lower halves 1 and 2. The guide block 8 is molded separately from the upper and lower halves 1 and 2 from a material with low friction and excellent vibration absorption properties, and includes a partition wall 9 that partitions the front opening 7 and the tape storage section, and a partition wall section 9 that partitions the front opening 7 and the tape storage section. A plurality of guide protrusions 10a protruding from 9 toward the front opening 7 side.
10f, and this guide protrusion 10a~
The base side of the tape T passing through the front opening 7 slides into contact with the tip of the tape 10f and is guided, thereby forming a stable tape running path. A shield plate 11 is fitted between the guide protrusions 10c and 10d at the center of the guide block 8, and a head crimping pad 12 is positioned in front of the shield plate 11 and supported by a leaf spring 13. There is.

[0005]

In the conventional tape cassette constructed as described above, sufficient tape running accuracy can be obtained in the portion guided by the guide block 8, but the other tape guide portions, that is, the guide The tape running accuracy in the pins 5 and guide rollers 6 is not very high, and therefore there is a limit to ensuring stable running accuracy over the entire tape running path. For this reason, deviations are likely to occur in the tape running path, resulting in problems such as a phase difference, a level difference between left and right channels, and irregular winding during tape recording/reproduction.

[0006] The present invention has been made in view of the above points.
The purpose of this paper is to propose a new structure for the tape guide system inside the tape cassette, and to solve the above problems.

[0007]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a tape cassette comprising a guide block for guiding a tape passing through a front opening in a cassette case constituted by upper and lower halves. In this embodiment, guide portions corresponding to the guide rollers and guide pins of a conventional tape cassette are integrally formed at both ends of the guide block.

[0008]

[Function] With the above configuration, all of the tape guide system inside the tape cassette is integrated, and as a result, stable tape running accuracy can be obtained as a whole, and the phase difference during tape recording/playback can be improved. level difference, winding disorder, etc. can be suppressed to a minimum.

[0009]

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 4. Parts corresponding to those of the conventional example shown in FIGS. Omitted.

The tape cassette according to the present invention has a structure in which the guide block 8 disposed in the front opening 7 is integrated with the guide pin 5 and guide roller 6 in the conventional tape cassette shown in FIGS. 5 and 6. It is taken. That is, in this example, as is clear from FIGS. 1 to 3,
An arc-shaped guide portion 14 and a pin-shaped guide portion 15 are integrally formed continuously at both left and right ends of the guide block 8. The arcuate guide portion 14 and the pin-shaped guide portion 15 correspond to the guide roller 6 and guide pin 5 in a conventional cassette, respectively. That is, the tape T wound around the reel hub 4 has its base surface aligned with the pin-shaped guide portion. The guide portion 15 and the arcuate guide portion 14 slide in contact with each other and are guided so as to be led out to the front opening 7 .

The guide block 8 is fixed to the cassette case through the left and right arcuate guide portions 14 and a center screw hole 8a formed in the center. That is, on the inner surfaces of each of the upper and lower halves 1 and 2, an annular boss portion 16 is protrudingly provided at a position corresponding to the arcuate guide portion 14 (i.e., the position where the guide roller 6 was placed in a conventional cassette). As shown in FIG. 4, both left and right ends of the guide block 8 are fixed by fitting the inner peripheral surface 14a of the arcuate guide part 14 to the boss part 16 during assembly, and the screws of the upper and lower halves 1 and 2 are fixed. The structure is such that the center portion of the guide block 8 is fixed by inserting the screw 3 that fixes the center portion of the cassette into the center screw hole 8a when the cassette is stopped.

The molding material for the guide block 8 is one that has high sliding properties to reduce friction against the tape T, one that does not resonate even with a thin wall structure, and one that does not have very high rigidity to absorb vibrations, and one that has molding accuracy. You need to choose the one with the highest value. The guide block 8 of this example that satisfies these conditions is made of high rigidity type HDPE, POM,
PA and ABS resins are preferably used.

By using such a material, the guide block 8 of this example has low friction on the sliding surface with the base surface of the tape T, so vibrations due to tape sliding are less likely to occur, and vibrations from the outside are suppressed. By absorbing the vibration, the magnetic head is not affected by vibration, and therefore the generation of tape modulation noise can be suppressed to a minimum. Furthermore, since the above materials are relatively inexpensive, they are also effective in reducing costs.

In this example, the guide block 8 is integrally formed with an arcuate guide part 14 and a pin guide part 15, which correspond to the guide rollers and guide pins of a conventional cassette, and the base surface of the tape T slides thereon. The integrated structure of all the guide parts makes it possible to maintain a constant positional relationship between each guide part, which improves tape running accuracy, resulting in positional differences during tape recording/playback, as well as left and right channels. The level difference in the winding can be improved, and the winding disorder can also be reduced.

Furthermore, in this example, the guide block 8 is provided with an arcuate guide portion 14 corresponding to the guide roller of a conventional cassette.
By integrally forming the guide roller, the number of parts can be reduced to the extent that the guide roller is unnecessary, and the assembly process can be reduced.

[0016]

[Effects of the Invention] As is clear from the above explanation, the present invention has the following advantages:
In a tape cassette having a guide block for guiding the tape passing through a front opening in a cassette case constituted by upper and lower halves, guide parts corresponding to a guide roller and a guide pin are integrated at both ends of the guide block. By forming it into It also has the effect of reducing assembly man-hours because the number of parts is reduced.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway plan view of a tape cassette according to an embodiment.

FIG. 2 is an exploded perspective view of the tape cassette of the embodiment.

FIG. 3 is a plan view of a guide block in the tape cassette of the embodiment.

FIG. 4 is an explanatory diagram of a method of fixing a guide block in the tape cassette of the embodiment.

FIG. 5 is a partially cutaway plan view of a conventional tape cassette.

FIG. 6 is an exploded perspective view of a conventional tape cassette.

[Explanation of symbols]

T tape 1 Upper half 2 Lower half 7 Front opening 8 Guide block 14 Arc-shaped guide part 15 Pin-shaped guide part

Claims (1)

[Claims] 1. A tape cassette comprising a guide block for guiding the tape passing through a front opening in a cassette case constituted by upper and lower halves, wherein a guide roller and a guide pin are provided at both ends of the guide block. A tape cassette characterized in that a corresponding guide portion is integrally formed.