JP2808625B2 - Tape cassette - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette, and more particularly to an improvement in a casing for storing a tape-shaped recording medium in a state wound on a reel.

[Summary of the Invention]

The peripheral portion of the pair of reel shaft insertion holes of the tape cassette casing, that is, the glasses portion, is formed from a material having a Young's modulus (flexural modulus) of 20,000 kg / cm ² or less,
Young's modulus (flexural modulus) in contact with these glasses
Use a material of 30000 kg / cm ² or more, and reduce the vibration caused by the contact between the rib on the peripheral edge of the reel shaft insertion hole and the reel or the contact between the rib on the reel shaft insertion hole and the reel shaft. It is designed to be attenuated by eyeglasses having a low elastic modulus.

[Conventional technology]

For example, as disclosed in Japanese Patent Application Laid-Open No. Sho 59-124073, a tape cassette is widely used as a recording medium of a tape recorder. In the tape cassette, a magnetic tape constituting a recording medium is wound around a pair of reels, and these reels are housed in a casing. A reel shaft insertion hole is formed in the casing, and the reel shaft of the tape recorder is inserted through the insertion hole. By rotating the reel with the reel shaft, the reel shaft is driven along the front opening of the casing. To run the magnetic tape.

[Problems to be solved by the invention]

In a conventional tape cassette of this type, the pair of reel shaft insertion holes of the casing, that is, the glasses portion is integrally formed with the other portion of the cassette half,
Its Young's modulus (flexural modulus) was composed of a synthetic resin molded body of 20000 kg / cm ² or more. Therefore, when the reel shaft is inserted into such a reel shaft insertion hole and the reel is driven to rotate, vibration occurs due to contact between the reel shaft and a rib on the periphery of the reel shaft insertion hole. Become. This vibration is transmitted to the tape guide portion through the casing, thereby causing noise and deteriorating sound quality.

The present invention has been made in view of such a problem, and a tape in which vibration is prevented from being transmitted to a tape guide portion by effectively absorbing vibration generated in a portion of a reel shaft insertion hole. It is intended to provide a cassette.

[Means for solving the problem]

According to the present invention, a tape-shaped recording medium is wound around a reel and housed in a casing, and a reel shaft is inserted into the casing through a reel shaft insertion hole provided in the casing, and the reel is rotated by the reel shaft. In a tape cassette in which a tape-shaped recording medium is run by being driven to rotate, the Young's modulus is 20,000 kg / cm.
To form a vicinity of the periphery of the reel shaft insertion hole of the casing by ² or less of the resin material, the Young's modulus Young's modulus of the 30000kg / cm ² or more of the resin material 2
The main body is formed so as to be in contact with a portion made of a resin material of 0000 kg / cm ² or less and to be integrally provided with a tape guide for guiding the tape-shaped recording medium.

[Action]

Therefore, even if vibration occurs due to contact between the reel shaft insertion hole portion and the reel shaft or between the reel shaft insertion hole and the reel, this vibration is caused by the low Young's modulus near the periphery of the reel shaft insertion hole. As a result, the vibration is not transmitted to the tape guide that guides the tape-shaped recording medium.

〔Example〕

FIG. 2 shows the overall structure of a tape cassette according to one embodiment of the present invention. The tape cassette has a cassette casing 10. The casing 10 is formed by combining a pair of upper and lower halves 11, 12 with each other. The magnetic tape 14 is wound around the pair of reels 15 and 16 with both ends fastened to these reels 15 and 16. The magnetic tape 14 wound on the reels 15 and 16 is stored in the casing 10. The magnetic tape 14 is guided by a pair of guide rollers 17 and 18 and is wound across the front opening 19 of the casing 10.

Upper and lower halves 11, 12 constituting the cassette casing 10
Are formed with reel shaft insertion holes 21 and 22, respectively.
The periphery of the reel shaft insertion holes 21 and 22 is
It has become. A shield plate 24 is disposed inside the front side opening 19 of the cassette casing 10.
26 are supported. Slip sheets 27 and 28 are disposed above and below the magnetic tape 14 wound by the pair of reels 15 and 16, respectively.
This enables the magnetic tape 14 to run smoothly.

The lower half 12 of the cassette casing 10 has four tape guides on its front side as shown in FIG.
33, 34, 35 and 36 are provided integrally. Further, the peripheral portions of the pair of reel shaft insertion holes 21 and 22 are constituted by eyeglasses 38. The glasses 38 are made of a material different from the other parts of the half 12.

FIG. 3 shows a mold for forming such a half 12. The mold is composed of an upper mold 41 and a lower mold 42, and a slide core 43 is mounted on the lower mold 42. It is slidably combined. On the other hand, the upper mold 41 has a gate 4
4 and 45 are formed respectively.

In the above configuration, as shown in FIG. 3, the upper and lower molds 41 and 42 are closed, and the slide core 43 is moved upward to form a cavity 46 in a closed state.
First, a first resin, for example, an AS resin is injected through a gate 44. Thereby, the main portion of the lower half 12 is formed in the cavity 46. Also at this time the tape guide on the half 12
33-36 are integrally molded. Then, while the first resin has not yet completely solidified, the slide core 43 is moved downward as shown in FIG. 4, and another cavity 47 is formed. Then, a second resin, for example, an ABS resin is injected into the cavity 47 through the gate 45. With this, the glasses part 38 is made of another resin,
That is, it becomes possible to mold from ABS resin.

Thus, in the tape cassette according to the present embodiment, the pair of reel shaft insertion holes 2 of the half 12 of the casing 10 are provided.
The portion of the eyeglass portion 38 at the peripheral edge of 1, 22 is made of, for example, an ABS resin having a Young's modulus (flexural modulus) of 20,000 kg / cm ² or less, and the main portion of the half 12 in contact with the eyeglass portion 38 A with a Young's modulus (flexural modulus) of 30000 kg / cm ² or more
It is made of S resin. Therefore, the vibration caused by the contact between the ribs 23 and the reel shaft inserted through the reel shaft insertion holes 21 and 22 or the vibration caused by the contact between the reels 15 and 16 and the ribs 23 causes the glasses having a low bending elastic modulus. As a result, the vibration is not transmitted to the tape guides 33 to 36. This makes it possible to prevent the occurrence of noise and to avoid the deterioration of sound quality.

The combination of the material of the main part of the half 12 and the glasses part 38 is such that the main part 12 is made of AS resin and the glasses part 38 is made of ABS resin instead of ABS resin.
Is composed of GP (general purpose) -PS (polystyrene) resin, and the glasses 38 are HIPS
(High impact polystyrene) resin may be used. Further, in the above embodiment, as shown in FIGS. 3 and 4, the glasses portion 38 is made of a material different from that of the main portion of the half 12 by a two-color molding method, and both are connected to each other. However, the spectacles 38 having the reel shafts 21 and 22 are formed in advance by another piece, and the spectacles 38 are later formed into a half 11,
12 may be joined by welding.

〔The invention's effect〕

The invention according to the first aspect is characterized in that the resin material having a Young's modulus of 20,000 kg / cm ² or less forms the vicinity of the periphery of the reel shaft insertion hole of the casing, and the Young's modulus of the resin material is 30,000 kg / cm ² or more. The main body is formed so as to be in contact with a portion made of a resin material of 20000 kg / cm ² or less and to be integrally provided with a tape guide for guiding a tape-shaped recording medium.

Therefore, the vibration caused by the peripheral edge of the reel shaft insertion hole coming into contact with the reel or the reel shaft has a Young's modulus of 20,000 kg /
It is possible to attenuate by the peripheral portion of the reel shaft insertion hole made of a resin material of cm ² or less, and vibration is applied to the tape guide integrally provided in the main body for guiding the tape-shaped recording medium. It is possible to prevent transmission. Therefore, the generation of noise and the deterioration of sound quality due to the vibration are eliminated.

Binomial invention is to form the vicinity of the periphery of the reel shaft insertion hole of the casing by the Young's modulus of 20000 kg / cm ² or less of a resin material, the Young's modulus is provided in the casing by 30000kg / cm ² or more resin materials And a tape guide for guiding a tape-shaped recording medium.

Therefore, the vibration caused by the peripheral edge of the reel shaft insertion hole contacting the reel or the reel shaft can be attenuated by the portion made of a resin material having a Young's modulus of 20000 kg / cm ² or less at the peripheral edge of the reel shaft insertion hole. Therefore, vibration is not transmitted to the tape guide provided on the casing for guiding the tape-shaped recording medium and having a Young's modulus of 30,000 kg / cm ² or more. Therefore, it is possible to stably guide the tape-shaped recording medium by a tape guide made of a resin material having a Young's modulus of 30,000 kg / cm ² or more, and at the same time, the above-mentioned vibration causes noise or deteriorates sound quality. It becomes possible to eliminate.

The invention according to claim 3 is a resin material having a Young's modulus of 20,000 kg / cm ² or less, in a region near the periphery of the pair of reel insertion holes of the casing and between the pair of reel shaft insertion holes, and at least a diameter of the reel shaft insertion hole. In addition to forming a region having a width corresponding to the above, the resin material having a Young's modulus of 30,000 kg / cm ² or more forms a portion in contact with a portion composed of a material having a Young's modulus of 20,000 kg / cm ² or less. is there.

Therefore, the area between the periphery of the pair of reel shaft insertion holes and the region between the pair of reel shaft insertion holes and at least the width corresponding to the diameter of the reel shaft insertion hole is formed of a resin material having a Young's modulus of 20,000 kg / cm ² or less. The area provided makes it possible to attenuate the vibration caused by the peripheral edge of the reel shaft insertion hole coming into contact with the reel or the reel shaft. For this reason, the area comes into contact with the above area and the Young's modulus is 30,000 kg /
Vibration is not transmitted to the region made of the resin material of cm ² or more, and a tape cassette excellent in damping performance for absorbing vibration generated at the peripheral portion of the reel shaft insertion hole is provided. Moreover, the Young's modulus is 20,000k in a region between the periphery of the reel shaft insertion hole and a region between the pair of reel shaft insertion holes and at least a width corresponding to the diameter of the reel shaft insertion hole.
Since it is made of a resin material of g / cm ² or less, it is possible to provide a tape cassette excellent in design even if the appearance of this part is different from other parts.

[Brief description of the drawings]

FIG. 1 is a plan view of the inside of a half of a tape cassette according to one embodiment of the present invention, FIG. 2 is an exploded perspective view showing the entire structure of the tape cassette, and FIG. FIG. 4 is a longitudinal sectional view of a mold in a state where the eyeglass part is molded. The names of the main parts in the drawings are as follows. 10 Cassette cassette 11 Upper half 12 Lower half 14 Magnetic tape 15, 16 Reel 21, 22 Reel shaft insertion hole 23 Rib 33 to 36 Tape guide 38 Glasses Department

Claims (3)

(57) [Claims] 1. A tape-shaped recording medium is wound around a reel and housed in a casing, and a reel shaft is inserted into the casing through a reel shaft insertion hole provided in the casing. with the tape cassette so as to run the tape-shaped recording medium, the Young's modulus is formed in the vicinity of the periphery of the reel shaft insertion hole of the casing by 20000 kg / cm ² or less of a resin material by rotatively driven by, A main part integrally provided with a tape guide that guides the tape-shaped recording medium while being in contact with a portion made of a resin material having a Young's modulus of 30,000 kg / cm ² or more and a resin material having a Young's modulus of 20,000 kg / cm ² or less. A tape cassette characterized in that it is formed. 2. A tape-shaped recording medium is wound around a reel and housed in a casing, and a reel shaft is inserted into the casing through a reel shaft insertion hole provided in the casing. with the tape cassette so as to run the tape-shaped recording medium, the Young's modulus is formed in the vicinity of the periphery of the reel shaft insertion hole of the casing by 20000 kg / cm ² or less of a resin material by rotatively driven by, A tape cassette, wherein a tape guide provided on the casing with a resin material having a Young's modulus of 30,000 kg / cm ² or more and guiding a tape-shaped recording medium is formed. 3. The tape-shaped recording medium is wound around these reels with both ends fastened to a pair of reels and stored in a casing, and is passed through a pair of reel shaft insertion holes provided in the casing. By inserting a pair of reel shafts into the casing and rotating the reels by the corresponding reel shafts, the tape-shaped recording medium is run so that the reel-shaped reels are fed out from one reel and wound on the other reel. In the tape cassette, a Young's modulus is a resin material having a Young's modulus of 20,000 kg / cm ² or less, at least in an area between the periphery of the pair of reel insertion holes of the casing and between the pair of reel insertion holes, and A region having a width corresponding to the diameter of the hole is formed, and the Young's modulus is 20,000 kg / cm by a resin material having a Young's modulus of 30,000 kg / cm ² or more. ^2. A tape cassette characterized in that it forms a portion that comes into contact with a portion made of the following materials.