JPH06124565A - Tape cassette - Google Patents

Abstract

PURPOSE:To facilitate the assembly and adjustment to produce a brake member by forming a level difference part by determining the contact part of the brake member produced by molds with the brake releasing member as a parting line position. CONSTITUTION:The parting line of the molds for producing the brake member is positioned at approximately the central part of the contact part 50 in order to obviate the generation of a flash on the side facing the inside surface 1a of an upper half 1 and the molds are divided to a stationary part and a moving part above and below with the parting line as a center. The part of the parting line usually wears and the flash is always produced in this parting line part if the molds are used for a long period of time. The need for adjusting the level difference at the time of assembling the molds is, therefore, eliminated. The parting line part is, thereupon, provided with the level difference to form the level difference part 53 in the contact part 50 of a pressing operation part 40, by which the adjustment of the level difference of the parting line is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette provided with a brake member for locking the rotation of a reel hub during storage and storage.

[0002]

2. Description of the Related Art For example, in a tape cassette for high density recording of video signals, PCM signals, etc., FIG.
As shown in (a), in order to prevent loosening of the magnetic tape 101 during storage and storage, a pair of reel hubs 102, 10
A brake member 104 for preventing the rotation of 3 is built in the cassette body 105.

The brake member 104 is a gear-shaped locked portion 10 formed on the reel hubs 102 and 103.
2a, 103a to engage these reel hubs 102,
Locking claws 106a, 10 for locking 103 in a non-rotatable manner
6b. Normally, the brake member 104 is provided with a spring pressure contact portion 107 provided at a substantially central portion of the cassette body 105.
By the biasing force of the spring member 108 made of a stainless wire or the like that is elastically deformed by coming into contact with the locking claws 106a and 10a.
By engaging 6b with the locked portions 102a and 103a, the reel hubs 102 and 103 are locked so that they cannot rotate.

On the other hand, when the tape cassette is mounted in the recording / reproducing apparatus, as shown in FIG. 18 (b), it is provided in the recording / reproducing apparatus through one lock release pin insertion hole 110a formed in the cassette body 105. The unlocking pin 109 is exposed to the inside, and the reel hubs 102, 1
Unlock 03. That is, the lock release pin 109 is provided on the pressing operation portion 111 having the inclined surfaces 111a and 111b provided at the position opposite to the lock release pin insertion hole 110a of the brake member 104, as shown in FIG.
As shown in (a) and (b), the brake members 104 are pushed up against the urging force of the spring members 108, so that the locking claws 106a and 106b and the locked portion 1 are engaged.
The reel hub 1 is disengaged from the reel hub 1
02 and 103 can be rotated.

[0005]

By the way, the brake member 104 is integrally formed by injecting resin into a mold and injection molding. For example,
To manufacture the brake member 104, a mold is used as shown in FIG.
As shown in, in order to prevent burrs or the like from being generated on the inclined surfaces 111a and 111b of the pressing operation portion 111 with which the unlocking pin 109 contacts, the pressing operation portion 111 has a sliding structure. That is, the mold is divided into a fixed portion 112, a movable portion 113, and a slide portion 114 that is a portion corresponding to the pressing operation portion 111, and the slide portion 114 is slidable in the arrow X direction in the figure. To do. That is, the parting line is set to the base end position of the inclined surfaces 111a and 111b provided above and below the pressing operation portion 111.

However, when the die is used for a long time, the abutting surface (parting line position) of the slide portion 114 and the fixed portion 112 and the movable portion 113 is worn and a burr 115 is generated at the interface. Depending on its size, the burr 115 may interfere with the other lock release pin insertion hole 110b provided on the upper half side and increase the lock release force for releasing the lock of the brake member 104.
In particular, when the burr 115 is large, smooth operation of the brake member 104 is hindered, and when the burr 115 is torn off by contact with the upper half, the burr 115 adheres to the magnetic tape 101 in the cassette body 105 and drops out. May occur.

Therefore, in order to solve the above-mentioned conventional technical problems, the present invention enables the reel hub to be unlocked smoothly, and the adjustment at the time of die assembly for manufacturing the brake member can be greatly shortened. An object of the present invention is to provide a tape cassette excellent in productivity and productivity.

[0008]

According to the present invention, a pair of reel hubs are rotatably disposed in a cassette body composed of upper and lower halves, and the reel hubs are movable in the contact and separation directions. In a tape cassette provided with a brake member that locks or unlocks rotation, the brake member is provided when a brake release member provided in a recording and / or reproducing device is inserted into the cassette body. It has a pressing operation portion that comes into contact with the brake releasing member and a slide portion that is operated to move along the inner surface of one half, and the pressing operating portion is provided with a step portion that comes into contact with the brake releasing member. It is characterized by

Further, according to the present invention, the step portion has a step surface facing the inner surface of the half which is in contact with the slide portion.

[0010]

In the tape cassette according to the present invention, the contact portion of the brake member manufactured by the mold with the brake release member is set as the parting line position, and the step portion is positively formed at the parting line position. Therefore, the stepped portion does not get caught in the lock release pin insertion hole opened in the cassette body, and the brake member can be smoothly moved and operated.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described in detail below with reference to the drawings. The present embodiment is applied to a stamp size ultra-small tape cassette having a length of 20 mm and a width of 30 mm.

In the tape cassette of this embodiment, as shown in FIGS. 1 to 3, the upper half 1 and the lower half 2 are opposed to each other and are fastened together by screws 3 to form a cassette body 4. The lid 6 for opening and closing the opening 5 formed on the front surface side of the main body 4 is rotatably attached.

A circular hub drive shaft insertion hole 2 formed in the upper and lower halves 1 and 2 is formed in the cassette body 4.
A pair of reel hubs 7, 8 arranged corresponding to a, 2b and 3a, 3b are rotatably housed. A magnetic tape 9 having a high coercive force capable of recording or reproducing a PCM signal is wound around these reel hubs 7 and 8. The magnetic tape 9 between the reel hubs 7 and 8 functions as a pair of pinch rollers 10 and 11 that also function as guide rollers rotatably provided on both sides of the opening 5 formed on the front side of the cassette body 4. It is pulled out into the opening 5 so as to be substantially parallel to the front surface of the cassette body 4 in a state of being stretched via the.

Further, on the upper and lower surfaces of the cassette body 4,
Accidental erasure prevention members 12 and 13 communicating with the upper and lower halves 1 and 2 are provided at both corners on the back side opposite to the lid 6. Then, the erroneous erasure prevention members 12, 13
At a position close to the center and a substantially central portion on the back side, circular and elliptical cassette reference holes 14, 15, 16a, 1 are formed.
6b are provided respectively. Furthermore, cassette reference holes 16a, 16 provided at the center of the cassette body 4
b and erroneous erasure prevention member 12 provided at each corner portion,
A plurality of circular detection holes 17 and 18 are provided between the detection holes 13 and 13.

A rack gear 20 is provided along the lateral guide groove 19 in the lid 6 that opens and closes the opening 5 of the cassette body 4. The rack gear 20
Is used as an engaging means when the cassette changer takes out the tape cassette from the cassette magazine when the tape cassette is stored in the cassette magazine, for example.

Further, in the substantially central portion of the cassette body 4, there are formed window portions 21 and 22 in the upper and lower halves 1 and 2, which are made of transparent resin and have a planar rectangular shape. Therefore, the winding appearance of the magnetic tape 9 stored in the cassette body 4 and the remaining amount of the tape can be visually confirmed from the outside of the cassette body 4 through the windows 21 and 22.

Particularly, in this tape cassette, when the magnetic tape 9 housed in the cassette body 4 is mounted on the recording and / or reproducing apparatus, recording / reproducing is performed by a helical scan system by a rotary head. It is designed to be done. That is, as shown in FIG. 2, the rotary head 23 is configured to rotate at a required angle with respect to the head drum 24. The head drum 24 is partially inserted into the opening 5 opened by rotating the lid 6 of the cassette body 4 upward or downward, and the magnetic tape 9 is wound around the peripheral surface thereof. Slide it. When the rotary head 23 rotates, the magnetic tape 9 is attached to the magnetic tape 9.
A slanted track is formed so as to cross diagonally.

At this time, the magnetic tape 9 is attached to the head drum 24.
In order to ensure that the upper half 1 is slidably contacted, the upper half 1 is removed from the insertion portion of the head drum 24 of the opening 5 of the cassette body 4 as can be seen from FIG. , A pair of tape guide members 25 and 26 having guide surfaces 25a and 26a formed as inclined surfaces opposite to each other are disposed inside the pinch rollers 10 and 11. Therefore, as shown in FIG. 4, by inserting the head drum 24 into the opening 5, the tape guide members 25, 2
The guide surfaces 25a and 26a of 6 abut on the peripheral surface of the head drum 24, that is, the magnetic tape 9 is guided between the peripheral surface of the head drum 24 and the magnetic tape 9.

On both sides of the head drum 24, the pinch rollers 10, 1 are provided at the openings 5 of the cassette body 4.
1 and the tape guide members 25 and 26 are provided with wing guides 27 and 28. A roller 2 for pressing the magnetic tape 9 to the tape guide members 25 and 26 is provided at the front end portions of the wing guides 27 and 28.
9, 30 are rotatably provided. These rollers 2
Reference numerals 9 and 30 denote support pieces 3 provided on the cassette body 4.
1, 32, the support pieces 31, 32, and the pinch roller 1
The tapes provided at positions close to 0 and 11 are inserted between the protrusions 33 and 34 for preventing protrusion.

As shown in FIG. 4, the pair of reel hubs 7 and 8 housed inside the cassette body 4 are inner hubs 7a and 8a into which a hub drive shaft (not shown) is inserted and engaged.
And outer hubs 7b and 8b which are axially movable and circumferentially engaged with the inner hubs 7a and 8a. The inner hubs 7a and 8a are provided with gear-like locked portions 35, which engage with locking pawls provided on a brake member, which will be described later, to prevent the reel hubs 7 and 8 from rotating.
36 is formed.

A brake member 37 for preventing the rotation of the reel hubs 7 and 8 is provided between the reel hubs 7 and 8 and is movably arranged in a recess 38 formed on the inner surface 2a of the lower half 2 so as to be lowered one step. It is set up. As shown in FIG. 5 to FIG. 7, the brake member 37 is provided with a slide portion 39 that is moved along the inner surface 2a of the lower half 2 and one end side of the slide portion 39 for recording and / or reproducing. It is composed of a pressing operation portion 40 that comes into contact with a brake release member provided in the device.

Since the slide portion 39 is arranged at a position to shield the window portion 22 provided in the lower half 2, the remaining magnetic tape 9 stored in the cassette body 4 through the window portion 22. For example, a transparent resin molding is formed in a flat plate shape so that the amount can be confirmed. The slide portion 39 is guided by a pair of guide pins 41 and 42 provided at a predetermined interval on the lower half 2 and slidable in the insertion / removal direction of the head drum 24 shown by an arrow A in FIG. ing. That is, a guide groove 43 that is an elongated hole and a guide groove 44 that is triangular are provided at positions corresponding to the guide pins 41 and 42, and the guide pins 41 and 42 are provided in the guide grooves 43 and 44. By being inserted, the slide portion 39 slides in the direction of arrow A in the figure.

The slide portion 39 has a reel hub 7,
Locking claw 4 that engages with the locked parts 35 and 36 provided in
5, 46 are provided. These locking claws 45, 46
Are provided on the tip side of the cassette body 4 on the side of the opening 5 at positions facing the reel hubs 7 and 8 as claws each having a V-shaped tip.

In order to lock the rotation of the reel hubs 7 and 8 on the slide portion 39, the locking claws 45 and 46 and the locked portions 35 and 36 are always engaged when the tape cassette is stored and stored. Further, a spring member 47 for constantly urging the slide portion 39 toward the opening 5 is attached. The spring member 47 is made of, for example, a rod-shaped stainless wire having a circular cross section, and both ends thereof are fixed to spring fixing portions 48 and 49 provided on the rear end side of the slide portion 39. One spring fixing portion 48 has an insertion hole to allow the spring member 47 to be inserted therein, and the other spring fixing portion 49 is adapted to engage the spring member 47 with a pair of staggered protrusions. The spring member 47 is attached to the brake member 37 by insert molding the brake member 37 in consideration of productivity.

On the other hand, the pressing operation section 40 is provided at a position opposed to the cassette reference holes 16a and 16b provided at one end edge of the slide section 39, that is, substantially at the center of the upper and lower halves 1 and 2. . The pressing operation portion 40 is formed as a truncated cone having a substantially triangular shape in plan view, which is large enough to be housed in the cassette body 4. The upper end surface 40a of the pressing operation portion 40 is in contact with the inner surface 1a of the upper half 1 when the brake member 37 is slid by a brake releasing member, which will be described later, so that the brake member 37 can slide stably. Play a role. In reality, a friction sheet (not shown) that smoothes the rotation operation of the reel hubs 7 and 8 arranged between the reel hubs 7 and 8 and the upper and lower halves 1 and 2 and prevents the magnetic tape 9 from being disturbed. ) To contact the inner surface 1a of the upper half 1. Further, the upper end surface 40a of the pressing operation portion 40 is provided with hemispherical projections 51 at each vertex of the triangular shape.

As shown in FIGS. 8 and 9, the pressing operation portion 40 has a brake releasing member 52 formed as a cylindrical pin having a tapered tip provided on the recording and / or reproducing apparatus. Is provided with a contact portion 50. The brake member 37 can be smoothly moved to the abutting portion 50 by a brake releasing member 52 inserted into the cassette body 4 through cassette reference holes 16a and 16b provided in the upper and lower halves 1 and 2, respectively. Inclined surfaces 50a and 50b are provided. The inclined surfaces 50a and 50b are formed as inclined surfaces having an arcuate cross section above and below the abutting portion 50 at the substantially central position. From the opposite point of view, the contact portion 50 has a mountain-like shape with the central portion as the apex.

Then, in the central portion of the contact portion 50,
A step portion 53 that comes into contact with the brake release member 52 is provided. The step portion 53 has a step surface 53a facing the inner surface 2a of the lower half 2 that contacts the slide portion 39. That is, in the step portion 53, the side facing the cassette reference hole 16a provided in the upper half 1 which is the A surface of the tape cassette is the cassette reference hole 16b provided in the lower half 2 which is the B surface of the tape cassette. It has a protruding shape compared to the opposite side. The amount of protrusion of the step portion 53 is set to 20 μm or less in consideration of the unlocking force of the reel hubs 7 and 8. When it becomes more than this, the unlocking force of the reel hubs 7 and 8 increases, and the smooth sliding of the brake member 37 is hindered.

The stepped portion 53 is formed by the brake member 3
It is formed by injection molding 7 in a mold. As shown in FIG. 12, in the mold for manufacturing the brake member 37, the parting line is formed substantially in the contact portion 50 in order to prevent burrs from being generated on the side facing the inner surface 1a of the upper half 1. The part is divided into a fixed part 54 and a movable part 55 in the upper and lower parts with the parting line as the center. Usually, when the mold is used for a long time, the parting line part is worn out, and burrs are inevitably generated in the parting line part. For this reason, it is necessary to adjust the step when assembling the mold. Therefore, in view of the above, in the present embodiment, the parting line portion is positively provided with a step and the step portion 53 is formed in the contact portion 50 of the pressing operation portion 40, so that the parting at the time of die assembly is performed. Easy adjustment of line step.

Brake member 37 formed in this way
3 is shown in FIG. 3 by the urging force obtained by pressing the spring member 47 against the pressing portion 56 provided in the cassette body 4 during storage and storage (in a state where recording / reproducing of the tape cassette is not performed). State, that is, locking claw 4
5 and 46 are locked portions 3 provided on the reel hubs 7 and 8, respectively.
The reel hubs 7 and 8 are locked in a non-rotatable state by engaging with the reels 5, 36.

For example, when the tape cassette is mounted on the recording and / or reproducing device with the side B facing downward, the brake releasing member 52 is moved to the cassette reference hole 16b as shown in FIG.
Then, it is inserted into the cassette body 4. Then, the brake release member 52 is inserted inward of the cassette body 4 along the inclined surface 50b of the contact portion 50 of the pressing operation portion 40. As a result, the brake member 37 is moved to the spring member 47.
Against the urging force of the head drum 24, it is guided by the guide pins 41 and 42 and slid in the insertion / removal direction of the head drum 24.
Further, when the brake releasing member 52 is inserted into the cassette body 4, the brake releasing member 52 comes into contact with the stepped portion 53 and urges the pressing operation portion 40 to incline in the direction of arrow B in FIG. . As a result, the brake member 37
Is slid in the insertion / removal direction of the head drum 24 shown by arrow C in the figure, and the engagement between the locking claws 45 and 46 and the locked portions 35 and 36 is released. As a result, the lock is released and the reel hubs 7 and 8 can rotate.

Further, when the tape cassette is ejected from the recording and / or reproducing apparatus and the brake releasing member 52 comes out from the cassette reference hole 16b, the brake releasing member 52 is pushed by the biasing force obtained by the spring member 47 as shown in FIG.
The sliding claws 45 and 46 provided on the brake member 37 engage with the locked portions 35 and 36 provided on the reel hubs 7 and 8, respectively. As a result, the reel hubs 7 and 8 are locked so that they cannot rotate.

Even when the tape cassette is mounted on the recording and / or reproducing apparatus with the side A facing downward, the brake releasing member 52 is connected to the cassette reference hole 1 as in the above operation.
6a, the reel hubs 7 and 8 are unlocked, and when the brake release member 52 comes out of the cassette reference hole 16a, the reel hubs 7 and 8 are locked so that they cannot rotate.

Actually, some brake members 37 in which the size of the stepped portion 53 provided on the abutting portion 50 of the pressing operation portion 40 is changed are manufactured, and each brake member 3 is manufactured.
The unlocking force of 7 was measured. That is, a padding is provided at the position where the step portion 53 of the brake member 37 is provided, and this is scraped off by an ultrasonic cutter or the like, and the height of the step portion 53 is 21 μm, 30 μm, 31 μm, 41 μm.
Was prepared. Then, these brake members 37 are incorporated into the cassette body 4, and the sliding portions of the upper and lower halves 1 and 2 that are in sliding contact with the brake member 37 and the brake member 37 are coated with silicone oil on the surface in order to avoid the influence of component wear as much as possible. Processed.

Then, the tape cassette incorporating the respective brake members 37 is mounted on the recording and / or reproducing device, and the F
The change in the unlocking force of the brake member 37 was continuously measured using an FT analyzer. The results are shown in FIGS. 13 to 16. In the figure, (a) shows the tape cassette released from side A, and (b) shows the tape cassette B.
Shows the data when released from the surface. The voltage on the vertical axis corresponds to 0 g at 0 V and 100 g at 0.5 V. Further, in the waveform of the unlocking force, the portion indicated by P ₁ shows the peak value of the releasing force in the step portion 53, and the portion indicated by P ₂ shows the peak value of the releasing portion.

As can be seen from these results, the step portion 5
If the height of 3 is 21 μm or less, the peak value P ₁ of the releasing force generated by the step portion 53 is the peak value P of the releasing portion.
Never exceed ₂ . That is, the height of the step portion 53 is set to 2
If it is 1 μm or less, the unlocking force of the reel hubs 7 and 8 is not affected. Further, as can be seen from the above results, when the height of the step portion 53 becomes 30 μm or more,
There is a difference in the peak value P ₁ of the releasing force at the step portion 53 depending on the releasing direction (A surface or B surface). In other words, when both are released from the B side of the tape cassette,
The release force is small.

This is because the brake member 37 itself is weak in rigidity, so that the pressing operation portion 40 bends its neck in the direction of arrow B in FIG. 10, and the step portion 53 becomes apparently small. That is, as shown in FIG. 11, when the pressing operation portion 40 is tilted, the actual height h of the step portion 53 is apparently reduced by the tilt θ (ha), and the unlocking force is reduced due to the reduction of the contact resistance. To do. From the opposite point of view, when the tape cassette is released from the B side, the allowable level for the height of the step portion 53 is larger.

From the above results, the height of the step portion 53 is set to 20.
Set to less than μm. The lower limit is set to 5 μm or more in consideration of die wear. Further, since there is a margin in the step allowance when the tape cassette is released from the B side, the step surface 53a is set to the B side in consideration of safety in case the step exceeds the allowable value of 20 μm. They are provided facing each other. In addition,
When the step surface 53a is provided so as to face the A surface side as shown in FIG. 17, the rigidity of the pressing operation portion 40 becomes high, so that the unlocking force of the reel hubs 7 and 8 becomes large.

The specific embodiments to which the present invention is applied have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made. For example, in the above-described embodiment, the stamp-sized ultra-small tape cassette is applied, but as long as it has a brake member for preventing the rotation of the reel hub, it can be applied to a tape cassette used in a video tape recorder or the like. The same effect can be obtained.

[0039]

As is apparent from the above description, in the tape cassette of the present invention, the contact portion of the brake member made of the mold with the brake release member is set to the parting line position. Since the step portion is positively formed in the abutting portion, the step portion does not get caught in the cassette reference hole opened in the cassette body, and the brake member can be smoothly moved and operated.

Further, in the tape cassette of the present invention, since the mold is provided with a step in advance, the parting line step adjustment at the time of assembling the mold can be completed in a short time, and the setup work can be greatly shortened. It is possible to improve productivity.

Further, in the tape cassette of the present invention, since the direction of the step is defined, it is possible to move the brake member smoothly without substantially affecting the unlocking force. You can

[Brief description of drawings]

FIG. 1 is a perspective view of a tape cassette.

FIG. 2 is a perspective view showing a relationship between a tape cassette and a head drum.

FIG. 3 is an enlarged plan view of the tape cassette showing a state in which an upper half is removed.

FIG. 4 is an enlarged plan view of an essential part showing a state in which a head drum is inserted in a tape cassette.

FIG. 5 is an enlarged plan view of a brake member.

FIG. 6 is an enlarged front view of a brake member.

FIG. 7 is an enlarged sectional view of a brake member.

FIG. 8 is an enlarged sectional view of an essential part showing an enlarged pressing operation portion of a brake member.

FIG. 9 is an enlarged sectional view of an essential part showing a state before the brake releasing member is inserted into the cassette reference hole.

FIG. 10 is an enlarged sectional view of an essential part showing a state where a brake releasing member is inserted in a cassette reference hole.

FIG. 11 is an enlarged cross-sectional view of an essential part showing a state where the pressing operation part is tilted by the brake release member.

FIG. 12 is an enlarged cross-sectional view of an essential part showing a mold for producing a brake member.

FIG. 13 is a characteristic diagram showing changes over time in the unlocking force when the height of the step portion is set to 21 μm, (a) of FIG.
In the case of releasing from the surface side, (b) shows the case of releasing from the surface B side.

FIG. 14 is a characteristic diagram showing changes over time in the unlocking force when the height of the step portion is 30 μm, where (a) is A
In the case of releasing from the surface side, (b) shows the case of releasing from the surface B side.

FIG. 15 is a characteristic diagram showing changes over time in the unlocking force when the height of the step portion is set to 31 μm, (a) of FIG.
In the case of releasing from the surface side, (b) shows the case of releasing from the surface B side.

FIG. 16 is a characteristic diagram showing changes over time in the unlocking force when the height of the step portion is 41 μm, where (a) is A
In the case of releasing from the surface side, (b) shows the case of releasing from the surface B side.

FIG. 17 is an enlarged cross-sectional view of an essential part of a pressing operation part when a step surface is provided on the A surface side of the tape cassette.

FIG. 18 is a view showing a locked state of a reel hub in a conventional tape cassette having a built-in brake member,
(A) is a plan view and (b) is an enlarged cross-sectional view of a main part.

FIG. 19 shows an unlocked state of a reel hub in a conventional tape cassette containing a brake member,
(A) is a plan view and (b) is an enlarged cross-sectional view of a main part.

FIG. 20 is an enlarged cross-sectional view of an essential part showing a mold for manufacturing a conventional brake member.

[Explanation of symbols]

 1 ... Upper half 2 ... Lower half 4 ... Cassette body 6 ... Lid 7,8 ... Reel hub 9 ... Magnetic tape 16a, 16b ... Cassette reference hole 35, 36 ...・ Locked part 37 ・ ・ ・ Brake member 39 ・ ・ ・ Slide part 40 ・ ・ ・ Pressing operation part 45,46 ・ ・ ・ Locking claw 47 ・ ・ ・ Spring member 50 ・ ・ ・ Abutting parts 50a, 50b ・..Slopes 52 ... Brake release members 53 ... Step portions 53a ... Step surfaces

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[Procedure amendment]

[Submission date] August 20, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction content]

Actually, some brake members 37 in which the size of the stepped portion 53 provided in the contact portion 50 of the pressing operation portion 40 is changed are manufactured, and the unlocking force of each brake member 37 is produced. It was measured. That is, the position where the step portion 53 of the brake member 37 is provided is changed to the ultrasonic cutter.
With the build-up and scraped by, for example, the step portion 53
Samples having heights of 21 μm, 30 μm, 31 μm and 41 μm were prepared. And these brake members 3
7 is incorporated in the cassette body 4, and the brake member 37
And the sliding portion and the brake member 37 in sliding contact with the upper and lower halves 1 and 2, were treated silicone oil to the surface in order to avoid as much as possible the influence of the component friction force.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0035

[Correction method] Change

[Correction content]

As can be seen from these results, if the height of the step portion 53 is 21 μm or less, the peak value P ₁ of the releasing force generated by the step portion 53 may exceed the peak value P ₂ of the releasing portion. Absent. That is, if the height of the step portion 53 is set to 21 μm or less, the unlocking force of the reel hubs 7 and 8 is not affected. Further, as can be seen from the above results, when the height of the step portion 53 becomes 30 μm or more, the step portion 53 is released in the releasing direction (A surface or B surface).
There is a difference in the peak value P ₁ of the releasing force at. That is, the releasing force is smaller in both cases when the tape cassette is released from the B side .

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 11

[Correction method] Change

[Correction content]

FIG. 11

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 13

[Correction method] Change

[Correction content]

[Fig. 13]

[Procedure Amendment 5]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 14

[Correction method] Change

[Correction content]

FIG. 14

[Procedure correction 6]

[Document name to be corrected] Drawing

[Correction target item name] Figure 15

[Correction method] Change

[Correction content]

FIG. 15

[Procedure Amendment 7]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 16

[Correction method] Change

[Correction content]

FIG. 16

Claims (2)

[Claims] 1. A pair of reel hubs is rotatably disposed in a cassette body composed of upper and lower halves, and is movable in a contacting / separating direction with respect to the reel hubs to lock or unlock the rotation of the reel hubs. In the tape cassette in which the brake releasing member is disposed, the brake releasing member provided in the recording and / or reproducing device is pressed against the brake releasing member when the brake releasing member is inserted into the cassette body. A tape cassette, characterized in that it has a section and a slide section that is operated to move along the inner surface of one of the halves, and that the pressing operation section is provided with a step section that comes into contact with the brake release member. 2. The tape cassette according to claim 1, wherein the step portion has a step surface facing the inner surface of the half that contacts the slide portion.