JPS601685A - Tape cassette - Google Patents

Abstract

PURPOSE:To protect an incorporated magnetic tape and at the same time to facilitate easy attachment of an energizing means by energizing with sliding a shielding plate by the energizing means and also forming a supporting surface for energizing means to the inner side of an inserting slot for energizing means. CONSTITUTION:When a shielding plate 18 is energized by a twist coil spring 31, each opening part of a cassette main body 1 is set asymmetrical to each window hole of the plate 18. The connecting part between the window holes is set opposite to each opening part to cut off a magnetic tape. When the plate 18 is pressed toward an arrow (a) against the spring 13, each opening part of the cassette main body 1 is opened for insertion of a magnetic head, etc. The spring 31 is inserted through a slot 29 and held by a supporting surface 15 to function as an energizing means. In such a constitution, an incorporated magnetic tape is protected and the attachment of the energizing means is also facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tape cassette designed to protect the magnetic tape loaded in the tape cassette body.

BACKGROUND TECHNOLOGY AND PROBLEMS Conventionally, a standard tape cassette called a co/bact cassette has a pair of tape reels rotatable inside the cassette body, which is constructed by integrally connecting a pair of upper and lower halves. The magnetic tape is wound and stored between the two tape reels, and the magnetic tape is moved in cooperation with the magnetic head and capstan, which slide into contact with the magnetic tape on the front side of the cassette body and perform recording and playback. It is constructed with an opening into which pinch rollers and the like are inserted to ensure constant speed travel.

In a tape cassette constructed in this way, the opening for inserting the magnetic head, pinch roller, etc. provided on the front side of the cassette body is relatively large and is formed to the extent that a person's finger, etc. can easily fit therein. While handling a tape cassette, fingers often enter the cassette body through the opening and touch the magnetic tape, resulting in fingerprints and other oily components adhering to the magnetic tape, and dust entering through the opening and adhering to the magnetic tape. There is a risk that this may occur.

If such oily components such as fingerprints or dust adhere to the magnetic tape, dropout of the recording/reproduction signal occurs during recording/reproduction, making it impossible to perform good recording/reproduction.

In particular, this type of tape cassette is used to record analog signals such as audio signals by converting them into pulse-coded PCM signals.
Alternatively, when this is used as a recording medium in a PCM recording/reproducing device designed to reproduce the same, the dropout of the recorded/reproduced signal becomes significant due to the adhesion of oily components such as fingerprints.

Purpose of the Invention In view of the above, the present invention provides protection for the magnetic tape by preventing oil and fat components such as fingerprints from adhering to the magnetic tape when a finger or the like accidentally touches the magnetic tape loaded in the cassette body. Easy assembly of tape cassettes, and! The present invention provides a tape cassette that enables automation of the entire process.

Summary of the Invention In order to achieve the above object, the present invention includes a pair of tape reels on which magnetic tape is wound, an opening is provided in the front part, and part or all of the opening is shielded in the front part. In a tape cassette in which a shielding plate is slidably disposed in the longitudinal direction of the tape, the shielding plate is slidably biased via a biasing means between the shielding plate and a predetermined portion of the cassette body, and the biasing A biasing means insertion opening for inserting and arranging the means in a predetermined position is provided at least on the front or side surface of the cassette body, and the biasing means support surface is formed by being located inside the insertion opening,
The built-in magnetic tape is protected and the biasing means can be easily assembled when assembling the cassette body.

Example Embodiments of the present invention will be described below with reference to the drawings.

(1) in the figure is the tape cassette body, with the upper part λ-
It consists of a front half (2) and a lower half (3). This cassette body (1) consists of an upper nof (2) and a lower nof.
Match these No. -f (2) and (
3) into the boss part of each screw insertion hole (4).
5) Alternatively, it is constructed by integrally connecting both the upper and lower nofs (21, (31) by mating or fitting the shafts.

Inside this cassette body (1) is a tape recorder (llll
A pair of tape reels (on which a predetermined amount of magnetic tape T is wound) have a
(3) , +71 are rotatably arranged.

In addition, on the front side of the cassette body (1), pinch rollers are arranged symmetrically across the front walls of the upper and lower nofs (21, (3)), sandwiching the central opening (8) into which the magnetic head is inserted. etc. are inserted into the opening t9), (91, (1(+1,
(oi is provided, and a guide body 01 is provided inside the opening, that is, at the front of the bottom of the lower nof (3).
) are provided.

Although not shown, a leaf spring provided with a pad for supporting the magnetic tape T is attached to the center of the front side of the guide body 01).

A pair of circular capstan insertion holes aa, (+2
A positioning through hole (1, 31n) is provided in the vicinity of the capstan insertion hole, into which a positioning pin provided on the tape recorder side is inserted.

A frame (I4) is fitted to the front part of the cassette main body (11) constructed as described above. 14a) and a lower frame (14b) fitted to the lower nof (3) side are aligned vertically to form a box shape with the rear side open. It is formed approximately symmetrically, and the front side is formed by retreating in a notch shape leaving both side parts so as to escape the boss part and guide body (lυ) of the screw insertion hole (4) in the center of the front side, and the retreating surface Openings (14b') (14b') through which the magnetic tape T can pass are formed between and the remaining surface, and the negative side of the upper frame (14a) is formed into a low step surface, which will be described later. A supporting surface (15) is formed.

The lower frame ('14b) of the frame body ([4) configured in this way
) on both sides of the inner surface are guide bins u61 [1fil is 4
ir (upright), and a guide roller (17
1 (+9) is rotatably supported, and the magnetic tape T is passed through the guide bin and guide roller from inside the frame to the front opening (8) to uoi of the cassette body (1) and the guide body opening υ. The above-mentioned two tape reels (6 bar force) are reciprocated through the gap.

The guide bin tmafa and the guide roller 016 may be surface-planted or pivotally attached to the upper half (2) or the lower half (3), and either the guide bin or the guide roller may be attached to the half (2) or (3). ) side and the other side on the frame body (old) side.

The cassette body (11 front openings +81, (9r, +9
A shielding plate (1
8) is slidably arranged. This shielding plate +181 is made of a magnetic metal such as phosphorus MLjrfJ and has a thickness of 03~
The cassette body (center B110 part (13) of 11 and other openings <9+, <9), tto:, t+o
+ window holes (tgl.

(201,e,!(1), C2+), C,! l
) A through hole p is formed on each side, and a suppression ↑ and an action CI'3+ formed by bending a protrusion provided at the other end are provided. The shielding plate 0 rod formed in this way is aligned with the front side of the cassette body (1), and the upper and lower edges are half upper and lower halves (2+
(3) Guide groove (241CJ) formed along the front wall of
The upper and lower halves (21 (3) are inserted into the upper and lower half (21 (3) One side of the sound part (27) 07, which is supported by the protruding piece (21i1) protruding from the inner surface of the cassette body (3), and the pressing operation piece (231) is provided symmetrically on both sides of the front side of the cassette body (3). It is arranged so that it can be slid freely while facing the front.

The shielding plate 0 disposed inside the cassette body (1) in this way
The mark has a retaining piece (281) protruding inward from the upper edge of the side opposite to the side where the suppressing operation piece (231) is formed.
On the other hand, the - side of the force set body (1) has a groove (located above the two, that is, a horizontally elongated part 0 on the upper half (2) side).
91 is provided corresponding to the support surface u9 formed on the negative side of the upper frame (14a) of the frame body 0, and this opening Q
A locking protrusion 0 ()) is provided on the inner surface of the upper half (2), located inside the upper half (2), and a torsion coil spring 01) is inserted from the mouth (2!1) to support the support surface 11!A. and supported in a sandwiched state by the inner surface of the upper half (2), one end (31a) is engaged with the retaining piece (27) of the shielding plate aQ, and the other end (31b) is held between the upper half (2) and the inner surface of the upper half (2). By locking and attaching the locking protrusion 0 (sec. ing.

In this way, the shielding plate (181 is the torsion coil spring C
31), each opening (8) of the cassette body (1) as shown in Figures 1 and 6.
.

(91, [95,001, noi to a hole cv, (20
+, (2+5 t2n, (2A and the through hole Ω are in a non-corresponding state, respectively, and the connecting part between these window holes faces each opening, and at least the cassette body (inside 11) is The magnetic tape TK is shielded so that fingers or the like cannot enter and touch the magnetic tape TK.

Then, twist the THB blocker 08) and coil spring (
When the pressing operation piece C23) is pressed and swept against the biasing force of 31), it slides in the direction opposite to the arrow a in FIGS. The openings are opened, and the magnetic head and
Pinch rollers etc. can be inserted.

In addition, in the above configuration, the torsion coil spring 61) is pressed against the shielding plate discharge by the pressing operation piece c! Although it is configured to be disposed on the side opposite to the forming side of 31, it goes without saying that both may be disposed on the same side. In addition, the frame body (
14) is divided into upper and lower frames (14a) and (14b), but only the frame on the side forming the support surface 05) may be made of K. Furthermore, it is also possible to form a support surface (+9 is the torsion coil spring 61) on the side where the insertion opening is formed (10MIS'--F (2) or the lower half]) in a continuous manner with the insertion opening. It is possible.

Also, use two shielding plates and slide them in different directions so that each of the 160 parts of the cassette body (1) is completely shielded and closed. If the support surface (15) and J1f
Entrance CI! (2) are formed symmetrically on both sides of the cassette body (1), and torsion coil springs 01) are supported and disposed on each side. In addition, the formation position of the insertion opening is not limited to the front side of the cassette body (1).
It goes without saying that surface (11) may also be used.

8 and 9 are installed in a tape recorder in which a tape cassette according to the present invention having the above-mentioned IVj configuration is installed.
By providing the shielding plate opening prompt as shown in the figure, the shielding plate (18) is automatically opened and closed in conjunction with the mounting operation of the cassette body (1).

This shield opening mechanism is operated by the cassette main body (1) when the cassette main body (1) is positioned and supported at the positioning support part (4υ) in the tape recorder as shown in FIG. A detection switch (271, (271 and 271 and These grooves f271 and (27i) are placed in opposing positions to operate the shielding plate (IpH suppression operation piece).
A pair of sweeping V-bars (451, (4G+) and these sweeping bars (I',)l, (1[il A pair of straight levers jff), f481 and a pair of straight levers jff), a pair of straight levers jff), a pair of letter-shaped levers (491, ff1 (lI), and a link lever (491, ff1 The link mechanism consists of a pair of I-shaped levers (rails, The drive shaft G of the plunger (ill) is attached to the slot, and a straight V-bar (w, (Constructed by connecting 48!, the pair of L-shaped V bars fa.

- By tensioning the compression coil spring 641 between the other ends, the operation levers (451, (41; Then, the cassette body (1) is installed, the detection switch (421) is operated, and the detection output is input to the noid plunger I!5υ. Then, the V-noid plunger C'ill operates so as to pull the drive shaft 63), and rotates the L-shaped lever 191, ←() against the compression force of the compression coil spring 6. , straight lever (4
n, (4 FIl via operation lever (451, (4
By rotating 61, these operation levers (A5' + (
[Operators 0 and 9 provided at the tip of i+ are the set body (11
Facing each groove part (271, f27+), press either one of the operators (41 to press the suppression operation piece +231 at the time of tracing fi, twist the thrust plate H and slide it against the coil spring C31), Each window TL, 0.9), (2o+,
C! u+,011*c! (1) Each opening (81, f, (9J,
These openings are opened to allow the magnetic head, pinch roller, etc. to enter into the cassette body (1).

In addition, in the above explanation, an example of a tape cassette in which the upper and lower surfaces can be used was given, so the grooves (271, (271) are provided on both flII K of the cassette body (1), and the operator (431) of the shielding plate opening mechanism is provided. An operating lever (451, (
41i1, but in the case of a tape cassette that uses only one side, only the groove facing the pressing action (23) of the shielding plate 081 is provided, and the -12 operation lever is also placed in the groove. It's good to have one thing to look forward to.

Effects of the Invention As described above, in the tape cassette according to the present invention, unless the shielding plate is slid against the biasing means, the opening of the cassette body is maintained in a traced state by the thrust folding, and the opening is not removed from the opening It prevents fingers from being inserted into the cassette body, prevents fingerprints and other oil components from adhering to the magnetic tape, and protects the magnetic tape from possible damage. The torsion coil spring is inserted through the insertion opening provided in the cassette body, and the inside (f
Since the cassette can be installed between the cassette body and the shielding plate by simply supporting it on the support surface of the illumination, the assembly process can be simplified and assembly can be automated, reducing costs. have an effect.

[Brief explanation of the drawing]

FIG. 1 shows an example of a tape cassette according to the present invention.
Fig. 2 is a perspective view of the same with the upper half removed (・Fig. 3 is a view of the part Wf extra), Fig. 4 is a view of the lower half part mfj, and Fig. 5 is a perspective view of the same. A partially cutaway plan view of the main part,
Figure 6 is the same, with a part of the main part cut out. Fig. ii and Fig. 7 are partially cut-away 1o+1 views of the main parts of the same, Fig. 8 is a schematic side rji drawing showing an example of a tape recorder to which the tape cassette according to the present invention is installed, and Fig. 9 is a rotational view. FIG. 2 is a plan view showing an example of a shielding plate opening mechanism provided in the tape recorder. In the figure, (1) is the cassette body, (2) is Dobe Ha-fu,
(3) is the lower frame, I is the frame, (14a) is the upper frame, (14b) is the lower frame, (15) is the support surface, 0P- is the shielding plate, (23i is the suppression operation piece, G !& means engagement, (a
, (271 is the groove part, C old is the insertion opening part, (3tl+ is the locking protrusion, ()1) is the torsion coil spring.

Claims (1)

[Claims] It has a built-in pair of tape reels on which magnetic tape is wound, has an opening in the front part, and has a shielding plate in the front part that shields part or all of the opening, which can be slid in the longitudinal direction of the tape. In the tape cassette arranged in the tape cassette, the shielding plate is slidably biased between the shielding plate and a predetermined portion of the tape cassette main body via a biasing means, and the biasing means is inserted and arranged at a predetermined position. A tape cassette, characterized in that a biasing means insertion opening is provided at least on the front or side surface of the cassette body, and a biasing means support surface is formed inside the insertion opening.