JPH06243651A - Tape cassette - Google Patents

Abstract

PURPOSE:To directly operate a miserasing preventing member by a finger without using a tool such as a screwdriver, etc. CONSTITUTION:The miserasing preventing member 34 formed with an operating part 31 and a detecting part 33 on both upper and lower ends is used, and the operating part 31 of this miserasing preventing member 34 is freely movably fitted along an upper surface 41a of an upper shell 41 of a cassette case 4. By this method, the detecting part 33 of this miserasing preventing member 34 is operated to move between a closing position of a miserasing preventing detecting hole 9 formed in a position higher than an ID detecting hole 10 and an opening position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette most suitable for application to a video tape cassette, etc.
The present invention relates to a cassette housing provided with an erroneous erasure prevention detection hole on the bottom surface and a plurality of ID detection holes arranged on both sides thereof.

[0002]

2. Description of the Related Art The applicant of the present invention first applied for a video tape cassette using a column-shaped erroneous erasure prevention plug as an erroneous erasure prevention member for a magnetic tape, as shown in FIGS. There is.

In this video tape cassette, a magnetic tape 1 is wound around a pair of left and right reels 2 and 3 and housed in a cassette housing 4. The magnetic tape 1 is guided by a pair of left and right tape guides 5 and is passed along the tape pull-out openings 6 formed on the front and bottom surfaces of the cassette housing 4, and the tape pull-out openings 6 are opened and closed. An opening / closing lid 7 is attached to the cassette housing 4 so as to be vertically rotatable.

The cassette housing 4 is composed of a lid plate-shaped upper shell 41 and a box-shaped lower shell 42 having an open upper surface.
The upper and lower shells 41, 4 are made of engineering plastics such as OM, ABS, HIPS, etc.
2 is fitted from above and below and screwed.

Then, a circular erroneous erasure prevention detection hole 9 is formed in the center position in the left-right direction of the bottom surface 42a of the lower shell 42 of the cassette housing 4 close to the tape drawing opening 6.
And a pair of four ID detection holes 10 arranged on both left and right sides of the erroneous erasure prevention detection hole 9 and a total of four ID detection holes 10 are formed in a horizontal row at the same height position. The erroneous erasure prevention detection hole 9 is a hole for detecting the presence or absence of erroneous erasure of the magnetic tape 1, and the ID detection hole 10 is a hole for detecting the type of the magnetic tape 1.

The erroneous erasure prevention detection hole 9 is opened at the lower end of a vertical cylindrical plug housing 11 integrally formed between the upper and lower shells 41 and 42, and the upper opening 12 of the plug housing 11 is opened. The upper shell 41 has an opening on the upper surface 41a. An erroneous erasure prevention plug 13 rotatable around a vertical axis is housed in the plug housing 11 so as to be vertically movable.

The erroneous erasure prevention plug 13 is formed of the above-mentioned engineering plastic into a cylindrical shape, and the spiral groove 14 formed on the outer periphery thereof is integrally formed on a part of the inner surface of the plug housing 11. Is engaged with the protrusion 15 formed.

Then, the tip of a tool such as a flat-blade screwdriver 16 inserted from the top opening 12 is attached to the erroneous erasure prevention plug 1
The erroneous erasure prevention plaque 13 is engaged with the minus groove 17 formed on the upper end of the screw 3 and the erroneous erasure prevention plaque 13 is rotated. The plug 13 is moved and adjusted in the up and down directions of the arrows a and b to block the erroneous erasure prevention detection hole 9 with the erroneous erasure prevention detection surface 18 formed horizontally at the lower end of the erroneous erasure prevention plug 13. The erasure prevention detection surface 18 is raised to a predetermined height so that the erasure prevention detection hole 9 can be opened.

The four ID detection holes 10 are integrally formed with four ID detection claws 19 that can be broken.

Then, as shown in FIG. 8, when this video tape cassette is mounted on the video tape recorder in the direction of arrow b, one erroneous erasure prevention detection switch 21 and four ID detection switches each constituted by a push switch are provided. The erroneous erasure prevention detection surface 18 of the erroneous erasure prevention detection hole 9 and the ID detection claw 19 of the ID detection hole 10 can be respectively detected by 22.

As shown in FIG. 8, the magnetic tape 1 is in a state in which the erroneous erasure prevention detection surface 18 is lowered to a level flush with the ID detection claw 19 and the erroneous erasure prevention detection hole 9 is closed.
The state in which the erroneous erasure prevention detection surface 18 is raised to a predetermined height to open the erroneous erasure prevention detection hole 9 is the unrecordable state in which the erroneous erasure of the magnetic tape 1 is prevented. . Further, when setting a specific type or the like of the magnetic tape 1, the ID detecting claw 19 corresponding to the magnetic tape 1 is broken off to open the specific ID detecting hole 10.

[0012]

However, in the prior application example,
Since the detection heights of the erroneous erasure prevention detection hole 9 and the ID detection hole 10 are the same and the erroneous erasure prevention plug 13 is rotated in the plug housing portion 11 and moved up and down, the operability is improved. It was very bad.

That is, since the size of the erroneous erasure prevention detection hole 9 is limited and the diameters of the plug housing portion 11 and the erroneous erasure prevention plug 13 have to be reduced, the upper end opening 12 is inserted into the plug housing portion 11. It is not possible to insert a finger and directly rotate the erroneous erasure prevention plug 13 with the finger.

Therefore, in order to rotate the erroneous erasure prevention plug 13, a tool such as a flat-blade screwdriver must be used, which is inconvenient. In addition, the operation of vertically moving and adjusting the erroneous erasure prevention plug 13 while rotating the erroneous erasure prevention plug 13 while the minus driver 16 or the like is inserted into the small plug housing 11 and engaged with the small minus groove 17 or the like is easy to operate. Is bad and inconvenient. If the engagement between the spiral groove 14 of the erroneous erasure prevention plug 13 and the protrusion 15 in the plug housing 11 is not loose to some extent, the rotation operation of the erroneous erasure prevention plug 13 cannot be performed lightly and the spiral groove 14 is projected. 1
If the engagement with 5 is too loose, the erroneous erasure prevention plug 13 easily rotates due to vibration or the like, and the erroneous erasure prevention plug 13
There is a problem that the height of the erroneous erasure prevention detection surface 18 is apt to be accidentally changed.

The present invention has been made to solve the above problems, and provides a tape cassette in which an erroneous erasure prevention member can be directly operated with a finger without using a tool such as a driver. Is intended.

[0016]

The tape cassette of the present invention for achieving the above object has an erroneous erasure prevention detection hole on the bottom surface of a cassette housing and a plurality of ID detection holes arranged on both sides thereof. In the formed tape cassette, the erroneous erasure prevention detection hole is provided at a position higher than the plurality of ID detection holes, and the erroneous erasure prevention member having the operation portion and the detection portion formed at the upper and lower ends is provided. An operation portion of the prevention member is movably attached along the upper surface of the cassette housing, and the detection portion of the erroneous erasure prevention member is opened at a position higher than the ID detection hole to close the erroneous erasure prevention detection hole. It is configured to be movable between the position and the position. At this time, the operation portion of the erroneous erasure prevention member is attached to the shell side of the cassette housing, the erroneous erasure prevention member is slidably attached to the cassette housing, and the erroneous erasure prevention member is attached to the cassette housing. It is preferably rotatably attached to the body.

[0017]

The tape cassette of the present invention constructed as described above uses the erroneous erasure prevention member in which the operation portion and the detection portion are formed at the upper and lower ends, and the operation portion of the erroneous erasure prevention member is attached to the cassette housing. By mounting the detection unit of the erroneous erasure prevention member at a position higher than the ID detection hole, the movable erasure prevention member can be moved between the position where the erasure prevention detection hole is closed and the position where the detection unit is opened. Therefore, the operation portion of the erroneous erasure prevention member can be directly operated with a finger.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a video tape cassette to which the present invention is applied will be described below with reference to FIGS. It should be noted that the same reference numerals are given to the same structural parts as those in FIGS. 6 to 8 and duplicate description is omitted.

[0019]

[First Embodiment] First, a first embodiment will be described with reference to FIGS.

First, in the first embodiment, a horizontal operating portion 31 formed of a substantially rectangular plate, and a cross-sectional shape formed vertically in the substantially central portion of the lower surface of the operating portion 31 are substantially T-shaped.
The column-shaped support 32 and the substantially square-shaped detection unit 33 formed horizontally at the lower end of the support 32 are designed for engineering.
Accidental erasure prevention member 34 integrally formed of plastic or the like
Is used. In addition, the support 32 is provided on the lower surface of the operation unit 31.
A pair of symmetrical locking claws 35 that are parallel to the longitudinal direction of the operating portion 31 are integrally formed on both sides of the operating portion 31. A pair of right angled ridges 36 are integrally formed.

Next, the four ID detection holes 10 are formed in a horizontal row as in the conventional case on the bottom surface 42a of the lower shell 42 of the cassette housing 4. The erroneous erasure prevention detection formed in the center of these holes is detected. The hole 9 is formed at a position higher than the ID detection hole 10 by a height H.

Next, in the upper shell 41 of the cassette housing 4, an elongated hole 51 for mounting the erroneous erasure prevention member 34 is formed from a position right above the erroneous erasure prevention detection hole 9 to one side. Therefore, the support column 32 and the detection portion 33 of the erroneous erasure prevention member 34 are fitted into the elongated hole 51 from above, and the pair of locking claws 35 are engaged under the both side edges 51a of the elongated hole 51.
Between the locking claws 35 and the operating portion 31, both side edges 5
Accidental erasure prevention member 3 by sandwiching 1a from above and below
4 is attached to the upper shell 41.

At this time, by the tapered surfaces 35a formed on both sides of the lower ends of the pair of locking claws 35, the both locking claws 35 are pushed from above between the both side edges 51a against the elasticity, and thus both locking claws 35 are pressed. Since the 35 can be engaged under the both side edges 51a with one touch, the erasure prevention member 34 can be attached to the upper shell 41 from above with one touch. Since the upper and lower shells 41 and 42 can be assembled with the erroneous erasure prevention member 34 previously attached to the upper shell 41, the ease of assembly of the cassette housing 4 is good.

While the erroneous erasure prevention member 34 is attached to the upper shell 41, the operating portion 31 closes the elongated hole 51 from above, and within the sliding range of the engaging claws 35 within the elongated hole 51. The erroneous erasure prevention member 34 has a long hole 51.
Inside, it is configured to be horizontally slidable along the upper surface 41a of the upper shell 41 in the directions of arrows c and d.

Then, the arrows c, d of the erroneous erasure prevention member 34
2A and 2B, the detection unit 33 closes the erroneous erasure prevention detection hole 9 shown in FIG.
It is configured to be horizontally movable in the directions of arrows c and d between the open position for opening the erroneous erasure prevention detection hole 9 shown in FIG.

The upper surface 41a of the upper shell 41 has a long hole 5
A recess 52 is formed around 1 and the operation portion 31 is inserted into the recess 52 and is arranged substantially flush with the upper surface 41a. Then, the recess 51 is engaged with the pair of ridges 35 on the lower surface of the operation portion 31 in a click manner, and the operation portion 3
A pair of recessed grooves 53 and 54 for positioning 1 at the slide position shown in FIGS. 1 and 2 are formed. In addition, the operation unit 3
A pair of chamfered portions 55 are formed on the upper surface of 1 at corners at both ends in the length direction so that fingers can be easily hooked. Also,
In the lower shell 42, a pair of horizontal slide guides 56 that guide the both ends of the detection unit 33 are integrally formed.

The horizontal lower surface of the detection unit 33 is formed on the erroneous erasure prevention detection surface 18, and the erroneous erasure prevention detection is performed in accordance with the height of the erroneous erasure prevention detection surface 18 (approximately the same height as H). The height (length) of the detector 21a of the switch 21 is formed large.

According to this first embodiment, the cassette housing 4
A finger can be directly put on the operation portion 31 of the erroneous erasure prevention member 34 from above, and the operation portion 31 can be directly slid in the directions of the arrows c and d with a finger, and a conventional tool such as a minus driver can be used. You don't have to use it.

At this time, since a pair of chamfered portions 55 are formed on the upper surface of the operating portion 31 at the corners at both ends in the lengthwise direction, it is easy to put a finger on the operating portion 31, and the operating portion 31 is indicated by arrows c and d. It can be operated easily and smoothly in any direction.

Then, as shown in FIG. 1, when the erroneous erasure prevention member 34 is slid in the direction of arrow c to close the erroneous erasure prevention detection hole 9 from above by the detecting portion 33, the operating portion 31 is operated.
The pair of convex ridges 35 are engaged with the pair of concave grooves 53 of the upper shell 41 in a click manner, and the erroneous erasure prevention member 34 is lightly locked.

The state in which the detection unit 33 closes the erroneous erasure prevention detection hole 9 is the recordable state of the magnetic tape 1. Then, in this state, when the video tape cassette is mounted on the video tape recorder from the direction of arrow b,
The recording enabled state is detected by the erroneous erasure prevention detection surface 18 of the detection unit 33 pressing the detector 21a of the erroneous erasure prevention detection switch 21 from the direction of the arrow b.

As shown in FIG. 2, when the erroneous erasure prevention member 34 is slid in the direction of the arrow d to open the erroneous erasure prevention detection hole 9 in the detector 33, a pair of projections 35 of the operating portion 31 is opened. Click-engages with the pair of concave grooves 54 of the upper shell 41, and the erroneous erasure prevention member 34 is lightly locked.

The state in which the detection unit 33 opens the erroneous erasure prevention detection hole 9 is a non-recordable state for preventing erroneous erasure prevention of the magnetic tape 1. Then, in this state, when the video tape cassette is mounted on the video tape recorder from the direction of the arrow b, the detector 21a of the erroneous erasure prevention detection switch 21 cannot detect the erroneous erasure prevention detection surface 18 of the detection unit, The above-mentioned unrecordable state is determined.

[0034]

Second Embodiment Next, a second embodiment will be described with reference to FIG.

The second embodiment uses an erroneous erasure prevention member 34 having a shape in which a horizontal operation portion 31 and a detection portion 33 are integrally molded or integrally fixed to both upper and lower ends of a vertical rotation shaft 37.

That is, the rotation shaft 37 of the erroneous erasure prevention member 34 is rotatably attached to the upper shell 41 of the cassette housing 4,
The operation unit 31 is horizontally rotated at a predetermined angle in the directions of arrows e and f between the position indicated by the solid line and the position indicated by the alternate long and short dash line, whereby the detection unit 33 is detected by the erroneous erasure prevention detection hole 9 as shown by the solid line. Is horizontally movable in the directions of the arrows e and f between the position where it is closed from above and the position where the erroneous erasure prevention detection hole 9 is opened as shown by the alternate long and short dash line.

Also in this second embodiment, the same effect as in the above-mentioned first embodiment can be obtained.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made based on the technical idea of the present invention. The present invention is not limited to video tape cassettes and can be applied to various tape cassettes.

[0039]

The tape cassette of the present invention constructed as described above has the following effects.

According to a first aspect of the present invention, an erroneous erasure prevention member having an operation portion and a detection portion formed at both upper and lower ends is used, and the operation portion of the erroneous erasure prevention member is movably attached along the upper surface of the cassette housing. Therefore, the detection unit of the erroneous erasure prevention member is
The erroneous erasure prevention detection hole formed at a position higher than the D detection hole can be moved between a closed position and an open position, and the operation portion of the erroneous erasure prevention member can be directly operated with a finger. Therefore, it is not necessary to use a tool such as a minus driver as in the conventional case, the operation of the erroneous erasure prevention member is simple, and the operability is remarkably improved.

According to a second aspect of the present invention, since the operation portion of the erroneous erasure prevention member is attached to the shell side of the cassette housing,
With the erasure prevention member already attached to the upper shell side,
Since the upper and lower shells can be assembled, the ease of assembling the cassette housing is improved.

According to the third and fourth aspects, the erroneous erasure prevention member is slidably attached to the cassette housing or the erroneous erasure prevention member is rotatably attached to the cassette housing. Easy to operate.

[Brief description of drawings]

FIG. 1 is a cross-sectional view taken along the line AA in FIG. 3A for explaining a closed state of an erroneous erasure prevention detection hole by an erroneous erasure prevention member according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG. 3A for explaining the opened state of the erroneous erasure prevention detection hole by the erroneous erasure prevention member in the first embodiment.

3 (A) is a plan view for explaining the state of attachment of the erroneous erasure prevention member to the upper shell in the first embodiment, and FIG. 3 (B) is FIG. 3 (A). 3 is a cross-sectional view taken along the line BB of FIG.

FIG. 4 is a plan view of the entire video tape cassette according to the first embodiment.

FIG. 5 is a perspective view illustrating an erroneous erasure prevention member according to a second embodiment of the present invention.

6A is a plan view of the entire video tape cassette of the prior application, and FIG. 6B is a side view of the entire video tape cassette.

FIG. 7 is a bottom view of the above video tape cassette.

FIG. 8 is a sectional view illustrating an erroneous erasure prevention plug of the prior application example.

[Explanation of symbols]

 1 magnetic tape 4 cassette housing 41 upper shell of cassette housing 41a upper surface of upper shell 42 lower shell of cassette housing 42a bottom surface of lower shell 9 erroneous erasure prevention detection hole 10 ID detection hole 31 operation unit 32 detection unit 34 erroneous erasure Prevention member

Claims (4)

[Claims] 1. A tape cassette in which an erroneous erasure prevention detection hole and a plurality of ID detection holes arranged on both sides thereof are formed on the bottom surface of a cassette housing. Provided at a position higher than the detection hole, and provided with an erroneous erasure prevention member in which an operation portion and a detection portion are formed at both upper and lower ends, and the operation portion of the erroneous erasure prevention member is movably attached along the upper surface of the cassette housing. The tape cassette, wherein the detection portion of the erroneous erasure prevention member is configured to be movable at a position higher than the ID detection hole between a position where the erroneous erasure prevention detection hole is closed and a position where the error erasure prevention detection hole is opened. 2. The tape cassette according to claim 1, wherein the operation portion of the erroneous erasure prevention member is attached to the shell side of the cassette housing. 3. The tape cassette according to claim 1, wherein the erroneous erasure prevention member is slidably attached to the cassette housing. 4. The erroneous erasure prevention member is rotatably attached to the cassette housing.
The described tape cassette.