JPH0711913B2 - Tape cassette - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette, and more particularly to a tape cassette suitable for use in a magnetic recording / reproducing apparatus such as a video tape recorder.

2. Description of the Related Art Generally, a tape cassette mounted on a magnetic tape device such as a video tape recorder has a structure in which a magnetic tape stretched over the front surface of a case body is sandwiched between a front lid and a back lid provided on the front surface of the case body. (For example, the actual exploitation Sho 63-
175279).

Hereinafter, a conventional tape cassette will be described with reference to the drawings.

FIG. 4 is a perspective view of a conventional example, and FIGS. 5 and 6 are cross-sectional views of a main part of a conventional tape cassette.

4 to 6, an opening 61 is provided on the front surface of the tape cassette 64 along substantially the entire width of the cassette. A magnetic tape 59 is stretched over the opening 61 and is normally covered with a front lid 58 and a back lid 57.

The front lid 58 is rotatable about a fulcrum pin 65. A first coil spring 66 is attached to the fulcrum 65, and constantly biases the front lid 58 in the closing direction.

Further, a pair of brackets is provided on the inner side of the upper surface of the front lid 58. A pair of support pins 60 provided on the left and right ends of the back cover 57 are inserted into the bracket portion, and the back cover 57 is supported by the support pins 60.
It is rotatable around.

In the guide groove 56, a pair of guide pins 55 provided at both ends of the back cover 57 are slidably inserted. A lock member 50 is rotatably provided on the cassette case 68. Furthermore, a leaf spring 70 is attached to the rear side of the lock member 50,
The lock member 50 is biased to rotate in the forward direction.

The projection 52 provided on the side plate 54 of the front lid 58 and the claw portion 53 of the lock member 50 are always engaged with each other to prevent the front lid 58 from rotating.

The operation of the tape cassette configured as described above will be described below.

The tape cassette 64 always prevents the careless opening of the front lid 58 by the lock member 50.

On the other hand, the tape cassette 64 is a video tape recorder (hereinafter
5), the lock member 50 is rotated in the direction A against the elastic force of the leaf spring 70 by the lock release member 71 provided on the VTR side as shown in FIG. The engagement between the claw portion 53 and the claw portion 53 is released, and the front lid 58 becomes rotatable.

After that, when it is moved in the B direction as shown in FIG. 5, the front lid 58 opens upward, and the back lid 57 has the support pin 60 and the fulcrum pin 65.
At the same time as moving to the information centering around, the guide pin 55 is guided along the guide groove 56 and is in an open state.

So far, the maximum opening operation to be attached to the VTR has been described,
The operation at the time of taking out is the reverse of the opening operation.

However, in the above-mentioned configuration, when the tape is slackened due to some accident and curls in the longitudinal direction, the front cover and the back cover for covering the tape are provided on the front surface of the cassette case. When the stretched tape is sandwiched, large tape damage may occur. Furthermore, the thickness of the cassette from the bottom of the cassette to the top of the front lid when the front lid is opened is larger than the thickness of the cassette when the front lid is closed, which is an obstacle to downsizing the VTR. was there.

In view of the above problems, the present invention is a small number of components, surely covers the tape without damaging the tape, high dust resistance to the tape, and even when opening the front lid,
An object of the present invention is to provide a tape cassette having a relatively thin cassette.

Means for Solving the Problems In order to solve the above problems, the tape cassette of the present invention has a pair of tape reels around which the tape is wound, and both ends of the tape are respectively locked, and the tape is stretched on the front surface,
A cassette case containing a pair of tape reels, an opening provided inside the tape stretched on the front surface, and a bottom surface of the tape pivotally supported on the side surface of the cassette case and having the opening stretched on the front surface. A lower lid that is covered by rotation, a guide groove provided on the side surface of the cassette case, one end is pivotally supported by the lower lid, and the other end is engaged with the guide groove of the cassette case, and is interlocked with the rotation of the lower lid. And a front lid that opens and closes the front surface of the tape stretched by being guided by the guide groove.

Effect of the Invention With the above-described structure, the present invention has a simple lid structure and covers the tape stretched over the front surface of the cassette case without dust or contact with human hands. Since the gap is opened and closed, the tape damage caused by the interference between the lid and the tape is prevented, and the lower lid that covers the lower surface of the opening by the rotation and one end is rotatably attached to the lower lid. The thickness of the cassette can be relatively thin when the lid is opened by adopting a structure in which the other end is guided by the guide groove on the side of the cassette case.
The thinness of the R device will be realized.

Embodiment A tape cassette according to an embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a plan view of a tape cassette according to an embodiment of the present invention, and FIGS. 2 and 3 are sectional views of the same main parts.

As is apparent from FIGS. 1 to 3, the tape cassette 11 has a flat appearance. Three
Is a cassette reel in which the start end or the end of the magnetic tape 6 is fixed, and the magnetic tape 6 is wound around the cassette reel 1, 1 is a cassette reel 3 arranged in two on the same plane, and the magnetic tape 6 is housed. It is a cassette case. Reference numeral 4 denotes an opening that is a space into which a post (not shown) for pulling out the magnetic tape 6 from the cassette case 1 enters, and the guide posts 8 at the left and right ends in the cassette case 1 allow the magnetic tape 6 to be in front of the cassette case 1. Is overhanging. Reference numeral 5 is a tape roll in which the magnetic tape 6 is wound around the cassette reel 3. Reference numeral 2 is a front lid that covers the upper surface and the front surface of the magnetic tape 6, and is covered with 2f and 2a portions, respectively. As shown in FIG. 1, it has a substantially U-shape. 7
Is a lower lid having an arcuate cross section in which the lower surface of the opening 4 of the magnetic tape 6 is covered with a portion 7d. The lower lid 7 is the side surface 1a of the cassette case 1.
A pair of lower lid rotation supporting shafts 7b provided on the left and right side plates 7a of the lower lid 7 are pivotally supported. The lower lid 7 rotates about a rotation support shaft 7b. Further, the lower lid 7 is always biased in the closing direction by a lower lid biasing spring (not shown) provided on one of the pair of rotation support shafts 7b. Further, 7c is a pin which is erected on the side plate portion 7a of the lower lid 7. The pin 7c is a recess 2c on both left and right sides of the front lid 2.
And the front lid 2 is rotatably supported around the recess 2c.

Reference numeral 2e is a guide pin that is erected on the left and right side plate portions 2d of the front lid 2, one end of the front lid 2 is engaged with a pin 7c of the lower lid 7, and the other end is formed on the side plate portion 1a of the cassette case 1. Guide groove 1c
The guide pin 2e is slidably guided in the. Further, in the closed state, the lower lid 7 is opened carelessly so that the magnetic tape 6 is not damaged by the tape.
Lower lid locking means (not shown) is provided for preventing rotation of the lid in the opening direction.

Further, 12 is for winding the magnetic tape 6 stably while the tape is running. Alternatively, it is a leaf spring that constantly urges the cassette reel 3 downward in order to send it out. One end of the leaf spring 12 is fixed to the upper back side of the cassette case 1, and the other end is in contact with the pivot portion at the upper end of the cassette reel 3.

The operation of the tape cassette 11 configured as described above will be described below.

FIG. 2 is a view of a closed state of the magnetic tape 6 when it is not used, and the magnetic tape 6 stretched over the opening 4 has a side surface 1d facing the front lid 2 and the opening 4 of the cassette case 1. And is covered with the upper surface portion 1b to prevent it from being touched by human hands and ingress of dust and the like.

On the other hand, when the tape cassette 11 is inserted into the VTR (not shown) in the direction of arrow I and further moved in the direction of arrow II, the lid opening means (not shown) provided in the VTR comes into contact with the lower lid 7 and moves downward. The lid 7 is rotated about the support shaft 7b against the lower lid biasing spring (not shown) in the opening direction. On the other hand, the front lid 2 also rotates together with the lower lid 7 via the pin 7c of the lower lid 7, one end of which rotates around the recess 2c, and the other end 2e is guided by the guide groove 1c to move in the opening direction. The magnetic tape 6 shown in the figure is in an open state in which it can be pulled out.

As shown in FIG. 3, the cassette thickness Hmax in the open state can be suppressed by a small increase compared to the cassette thickness H in the closed state.

Also, by the movement in the direction of arrow II, the two reel stands 13 provided in the VTR and the two cassette reels 3 in the cassette case 1 are engaged with each other, and the cassette reel 3 is separated from the lower surface of the cassette case 1. The reel base 13 and the cassette reel 3 rotate integrally as a result of being held in the position.

Further, the opening 4 inside the magnetic tape 6 stretched over the front surface of the cassette case 1 is opened from the front lid 2,
A loading post (not shown) provided inside enters into the opening 4, pulls out the magnetic tape 6 in the direction of arrow III, and winds the magnetic tape 6 around a traveling post such as a cylinder (not shown). Record and play back.

The above describes the mounting operation when mounting the tape cassette 11 in the VTR cassette mounting position.
The operation of taking out the VTR from the VTR is the reverse of the mounting operation.

EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to reliably protect the magnetic tape positioned at the opening from human hands, dust and the like with a simple lid structure. Further, by forming a front lid structure that covers the front surface of the magnetic tape stretched over the front surface and the lower surface of the opening by rotation, a wide gap can be secured between the magnetic tape and the lid, and even if the magnetic tape is slightly slack, The lid does not catch the magnetic tape and damage it, and the maximum thickness of the cassette when the lid is opened can be suppressed by a small amount compared to the thickness when the lid is closed, which is advantageous for thinning the VTR device. Have.

[Brief description of drawings]

FIG. 1 is a plan view of a tape cassette according to an embodiment of the present invention,
2 and 3 are cross-sectional views of a main part of the tape cassette of the present invention, FIG. 4 is a perspective view of a conventional tape cassette, and FIGS. 5 and 6 are cross-sectional views of the main part. 1 ... Cassette case, 1c ... Guide groove, 2 ... Front lid, 4
...... Aperture, 6 ...... Magnetic tape, 7 ...... Lower lid, 7b ...... Lower lid rotation spindle.

Claims (2)

[Claims] 1. A pair of tape reels around which a tape is wound and both ends of which are locked, a cassette case in which the tape is stretched on the front surface, and the pair of tape reels are built in, and a tape cassette is mounted on the front surface. An opening provided inside the stretched tape, a lower lid pivotally supported on the side surface of the cassette case, and covering the opening from the lower surface of the tape stretched on the front surface by rotation, and the cassette case A guide groove provided on the side surface of the cassette, one end of which is pivotally supported by the lower lid, and the other end of which is engaged with the guide groove of the cassette case and is guided by the guide groove in conjunction with the rotation of the lower lid. And a front lid that opens and closes the front surface of the stretched tape. 2. A pair of tape reels around which a tape is wound and which holds both ends of the tape, a cassette case in which the tape is stretched on the front surface, and the pair of tape reels are built in, and a cassette case is mounted on the front surface. An opening provided inside the stretched tape, a lower lid pivotally supported on the side surface of the cassette case, and covering the opening from the lower surface of the tape stretched on the front surface by rotation, and the lower lid. Urging means for always urging the lid in the closing direction, a guide groove provided on the side surface of the cassette case, one end pivotally supported by the lower lid, and the other end engaged with the guide groove of the cassette case. And a front lid which is interlocked with the rotation of the lower lid and which opens and closes the front surface of the stretched tape by being guided by the guide groove.