JPH05258502A - Tape cassette - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a lid lock mechanism of a tape cassette used in a magnetic recording / reproducing device such as a video tape recorder and various other information processing devices. A lid when the tape cassette is mounted on the device. The purpose is to prevent the scrap powder of the rear lid generated at the time of unlocking from adhering to the tape. [Structure] The lid lock release protrusion 30 on the apparatus side is pressed against a protrusion 26 provided on the rear lid 7 of the cassette body to release the lid lock. With the above-described configuration, the lid unlocking protrusion 30 presses the protruding portion 26 of the rear lid 7, so that even if the protruding portion 26 is scraped off, the tape 5 and the protruding portion 26 of the rear lid 7 become the back lid portion 16 of the rear lid 7. Since it is isolated, shavings do not adhere to the tape. Therefore, it is possible to prevent problems such as an increase in dropout due to adhesion of tape powder and head clogging.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette used in a magnetic recording / reproducing device such as a video tape recorder and various other information processing devices.

[0002]

2. Description of the Related Art In recent years, with the increasing density of magnetic recording, tape cassettes and video tape recorders (hereinafter referred to as VTRs)
Is becoming more compact. As a result, V
TR is often used outdoors such as photographing a landscape or a person. Among them, in consideration of the outdoor use of the tape cassette as well, as a dust-proof measure, a two-type lid that covers the front surface and the back surface of the tape has been put into practical use.

The above-mentioned conventional tape cassette will be described below with reference to the drawings. As shown in FIGS. 9 and 10, a tape 33 is stretched over the front surface of the tape cassette and is normally covered with a front lid 34 and a rear lid 35.

A pair of fulcrum pins 37, 37 'are provided on both left and right end surfaces 36 of the front lid 34, and the fulcrum pins 37, 37' are provided with a pair of notches 3 provided at both left and right ends of the upper half 38.
It is inserted in 9. The front lid 34 is the fulcrum pin 3
It is rotatable about 7, 37 '. In addition,
A coil spring 40 is attached to the fulcrum 37 'side,
The front lid 34 is always urged to rotate in the closing direction. A notch 41 is provided in the center of the front surface of the front lid 34.

A pair of bracket portions 42 are provided on the inner surface of the front lid 34. Then, a pair of support pins 44, 44 'provided at the left and right ends of the rear lid 35 are inserted into the pin holes 43 of the pair of bracket portions 42, and the rear lid 35 is centered on the pair of support pins 44, 44'. It is rotatable. A coil spring 45 is provided on the side of the support pin 44 'to constantly bias the lid in the closing direction.

A pair of rear lid guide grooves 48 are provided behind the pair of tape guides 47 provided on the lower half 46. A pair of guide pins 50 formed on protrusions 49 provided at both left and right ends of the rear lid 35 are slidably inserted into the rear lid guide groove 48.

The portion 48a of the rear lid guide groove 48 is formed in the same locus as the guide pin 50 of the rear lid 35 rotates about the support pins 44 and 44 ', and has a small curvature.

The operation of the tape cassette configured as described above will be described below. When the front lid 34 of the tape cassette is intentionally opened when not mounted, the guide pin 50 of the rear lid 35 causes the rear lid guide groove 48 to have a small curvature 48a.
The front cover 34 and the rear cover 35 are locked because they are in a locked state.
I can't open the lid.

On the other hand, when the tape cassette is inserted into the apparatus, as shown in FIG. 11, the lid lock releasing projection 51 of the cassette holder arranged on the apparatus side is inserted through the notch 41 provided in the central portion of the front lid 34. The lower end portion 52 of the lid 35 is moved in the F direction. Therefore, the rear lid 35 pivots around the support pin 44 against the coil spring 45, and the guide pin 50 moves to the position shown in FIG.
As shown in 1, the rear lid guide groove 48
It comes off from part a.

Thereafter, one end of the front lid 34 of the tape cassette is pushed up by an opening pin arranged on the apparatus side. Therefore, the front lid 34 rotates upward against the coil spring 40. At this time, the guide pin 50 and the rear lid guide groove 4
There is no force acting against 8 to prevent rotation. Therefore, the rear lid 35 is opened while being guided by the rear lid guide groove 48.

[0011]

However, the above-mentioned configuration has the following problems.

As shown in FIG. 11, when the lid lock of the tape cassette is unlocked, the lid lock release protrusion 51 and the rear lid 3 on the apparatus side are released.
5 and the lower end surface 52 of the sheet 5 will hit. Usually the rear lid 3
Since 5 is a synthetic resin and the lid lock release protrusion 51 on the device side is made of metal, the rear lid 35 of the synthetic resin having a low hardness is scraped, and scraped powder adheres to the lower end surface 52 of the rear lid 35. The tape 33 is made of a synthetic resin film and is very easily charged, and as shown in FIG.
And tape 33 are very close to each other,
The scraped powder of the rear lid 35 easily adheres to the tape 33. As a result, there has been a significant deterioration in image quality, such as an increase in dropout due to tape powder adhesion and head clogging.

In view of the above problems, the present invention provides a tape cassette which prevents the adhesion of tape powder and the resulting increase in dropout and clogging of the head.

[0014]

In order to solve the above-mentioned problems, in the tape cassette of the present invention, the lid lock releasing means on the device side releases the lid lock by pressing the protruding portion provided on the rear lid of the cassette body. It was designed to do.

[0015]

According to the present invention, the lid lock releasing means presses the protruding portion of the rear lid so that the tape and the protruding portion of the rear lid are separated from the back lid portion of the rear lid even if the protruding portion is scraped off. As a result, the shavings do not adhere to the tape. Therefore, it is possible to prevent problems such as an increase in dropout due to adhesion of tape powder and head clogging.

[0016]

EXAMPLE An example of the present invention will be described below.

FIGS. 1 and 2 are an assembly perspective view of a tape cassette and an exploded perspective view of a tape cassette lid portion according to one embodiment.

As shown in FIG. 1, the cassette body constituting the tape cassette 1 is composed of a synthetic resin molded rectangular upper half 2 and a lower half 3. Then, the upper half 2 and the lower half 3 are fitted to each other from above and below,
It is screwed with a set screw to form an integral housing.
An opening 4 is provided on the front surface of the tape cassette 1 for inserting a tape pull-out member on the apparatus side. A tape is stretched over the opening 4 and is normally covered with the front lid 6 and the rear lid 7. The cassette body accommodates a pair of reels (not shown) around which the tape 5 is wound.

As shown in FIG. 2, the front lid 6 is composed of a front lid portion 8 which covers the front surface of the tape 5 stretched over the opening portion 4 and an upper lid portion 9 which covers the upper surface of the tape 5, and is substantially U-shaped. It has a shape. A pair of fulcrum pins 11 are provided on both left and right end surfaces 10 of the front lid 6,
11 'is provided, and the fulcrum pins 11 and 11' are the upper half 2
Are inserted into a pair of notches 12 provided at both left and right ends of the. The front lid 6 is rotatable around the fulcrum pins 11 and 11 '. A coil spring 13 is mounted on the side of the fulcrum 11 'to constantly bias the front lid 6 in the closing direction. A pair of bracket portions 14 are provided on the inner surface of the upper lid portion 9 of the front lid 6, and pin holes 15 are formed in the pair of bracket portions 14.

The rear lid 7 includes a back lid portion 16 that covers the back surface of the tape 5 stretched over the opening portion 4 and an upper lid portion 1 that covers the upper surface of the opening portion 4.
7 and. The rear lid 7 has a substantially V-shape centering on a pair of support pins 18 provided at a substantially central portion of the side surface of the rear lid 7. In addition, openings 4 are formed at the left and right ends of the rear lid 7.
A projecting portion 26 that projects in a direction away from the tape 5 stretched over is provided, and a pair of guide pins 27 is formed on the projecting portion 26.

The pair of support pins 18 are inserted into the pin holes 15 of the front lid 6 bracket portion 14, and the rear lid 7 is rotatable about the pair of support pins 18. Further, the support pin 18 is provided with a coil spring 19 so that the lower end surface 20 of the front lid 6 and the lower end surface 21 of the rear lid 7 are constantly biased in a direction in which they are aligned with each other.

A pair of tape guides 22 provided on the lower half 3 guide and support the tape 5 stretched over the openings 4. A pair of notches 23 is provided on the lower end surface 20 of the front lid portion 8 of the front lid 6 located near the tape guide 22. The notch 23 is formed to receive the front surface of the tape cassette 1 when the tape cassette 1 is inserted into the cassette holder on the apparatus side. It is necessary for the release projection to pass through.

A pair of rear lid guide grooves 25 are provided behind the pair of tape guides 22 and on both side surfaces of the opening 4. As shown in FIG. 3, the rear lid guide groove 25 has a groove formed from the upper end to the lower end, and includes an upper bent portion 25a, a substantially straight portion 25b, and a lower bent portion 25c. The rear lid guide groove 25 has a protrusion 26 of the rear lid 7.
A pair of guide pins 27 formed in the above are slidably inserted. The lower bent portion 25c of the rear lid guide groove 25 is formed in the same trajectory as the guide pin 27 of the rear lid 7 rotates about the support pin 18 when the rear lid 7 is closed.

The tape cassette 1 constructed as described above
The operation will be described below. Tape cassette 1
As shown in FIG. 3, the tape 5 stretched over the opening 4 is normally covered with a front lid 6 and a rear lid 7. And the front lid 6
When the user intentionally tries to open, the force in the direction A acts on the guide pin 27. However, since the guide pin 27 and the lower bent portion 25c of the rear lid guide groove 25 are in an engaged state, the guide pin 27 has two portions of the rear lid guide groove 25.
No component force in the B direction is generated at the portion 5c. Therefore, the front lid 6 is closed.

In addition to the above, the locking state of the guide pin 27 and the lower bent portion 25c of the rear lid guide groove 25 is not limited to the above, but the rear lid guide groove 2 having a substantially straight line portion as shown in FIG.
It may have a 5d shape. Further, in order to bring the lower end surface 21 of the rear lid 7 and the lower end surface 20 of the front lid 6 into contact with each other to eliminate the gap 28 between their mating portions, the guide pin 27 and the rear lid guide groove 25 are formed as shown in FIG. A gap 25e is formed between the lower bent portion 25d.
Should be provided. That is, since the lower end surface 21 of the rear lid 7 and the lower end surface 20 of the front lid 6 are constantly brought together by the coil spring 19, the guide pin 27 is shown by B in FIG.
Any shape may be used as long as it does not easily move in the direction.

The guide surface 25f (shown by the chain double-dashed line) on the rear side of the rear lid guide groove 25 shown in FIG.
It is guided only by the guide surface 25g on the front side.

On the other hand, when the tape cassette 1 is inserted into the apparatus, as shown in FIG. 5, the lid lock releasing projection 30 of the cassette holder 29 arranged on the apparatus side enters through the notch 23 of the front lid 6 and enters the rear lid 7. The guide pin 27 portion provided on the protruding portion 26 is pressed in the C direction. Therefore, the rear lid 7 rotates around the support pin 18 against the coil spring 19, the guide pin 27 moves in the D direction as shown in FIG. 5, and is removed from the lower bent portion 25c of the rear lid guide groove 25.

Thereafter, when the tape cassette 1 is moved in the E direction as shown in FIG. 6, one end of the front lid 6 is pushed up by the opening lid pin 31 arranged on the apparatus side. Therefore, the front lid 6 rotates upward against the coil spring 13.
At this time, no force is exerted between the guide pin 27 and the rear lid guide groove 25 to prevent the rotation. Therefore, the rear lid 7 is opened while being guided by the rear lid guide groove 25. The lid closing operation is the reverse of the above-mentioned operation.

With the above structure, the rear lid 7 protruding portion 26 that abuts on the lid lock releasing projection 30 as shown in FIG.
Even if shavings are generated in the guide pin 27 part of the tape 5, the tape 5 stretched over the opening 4 is separated from the guide pin 27 part by a distance, and the back cover part 16 of the rear cover 7 causes the tape 5 Scrap powder does not adhere to the tape 5 because it is isolated. Further, the distance between the lower end surface 21 of the rear lid 7 and the tape 5 in the opening trajectory of the rear lid 7, and the guide pin 27 and the tape 5
Even if the distance is compared with, the latter is more advantageous in terms of adhesion of the shavings because the latter is farther away. Therefore, a large problem such as an increase in dropout due to the attachment of the shavings and a head clogging does not occur, so that a high effect of maintaining high image quality occurs.

In the above embodiment, the lid lock release projection 3
0 was pressed against the guide pin 27 portion formed on the protruding portion 26 of the rear lid 7, but the protruding portion 26 ′ protruding from the back lid portion 16 ′ of the rear lid 7 ′ as shown in FIG. 7 and FIG. Alternatively, the protrusion 26a 'may be provided with a protrusion 26a' or the like protruding downward and the protrusion 26a 'may be pushed to unlock the lid. As described above, the guide pin 27 and the convex portion 26
Even if the lids are unlocked by pushing the protrusions 26, 26 'including a', the same effect as described above occurs.

In the above embodiment, the lid lock mechanism has been described with a two-piece lid structure including the front lid 6 and the rear lid 7.
No. 2-54882, Japanese Patent Publication No. 63-16824, Japanese Patent Publication No. 63-16826, and Japanese Patent Publication No. 63-18.
If it is composed of a plurality of lids as shown in Japanese Patent No. 272 and the like, and if there is a guide means for guiding the lids, the construction based on the technical idea of the present invention can be easily performed and the same effect as described above can be obtained.

[0032]

As described above, according to the present invention, the lid lock releasing means on the apparatus side releases the lid lock by pressing the protruding portion provided on the rear lid of the cassette body to scrape off the protruding portion. Even if occurs, since the tape and the protruding portion of the rear lid are separated from the back lid portion of the rear lid, shavings do not adhere to the tape. Therefore, problems such as increase in dropout due to adhesion of tape powder and head clogging can be prevented, and a high effect of maintaining high image quality occurs.

[Brief description of drawings]

FIG. 1 is an assembled perspective view of a tape cassette according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the tape cassette lid portion.

FIG. 3 is a sectional view of an essential part of the tape cassette lid portion.

FIG. 4 is a cross-sectional view of a main part of the tape cassette lid portion showing another embodiment of the rear lid guide groove.

FIG. 5 is a cross-sectional view of a main portion of a tape cassette lid portion showing a lid lock releasing means when the tape cassette is inserted into a cassette holder.

FIG. 6 is a cross-sectional view of a main part of a tape cassette lid portion showing a lid opening means of the tape cassette.

FIG. 7 is a perspective view of a rear lid showing another embodiment.

8 is a side view of the rear lid shown in FIG.

FIG. 9 is an exploded perspective view of a conventional tape cassette lid portion.

FIG. 10 is a sectional view of the main part of the tape cassette lid portion.

FIG. 11 is a cross-sectional view of a main part of a tape cassette lid portion showing a lid lock releasing means when the tape cassette is inserted into a cassette holder.

[Explanation of symbols]

 6 Front Lid 7 Rear Lid 19 Coil Spring 21 Lower End Face 23 Notch 25 Rear Lid Guide Groove 26 Projection 26 'Projection 27 Guide Pin 30 Lid Lock Release Protrusion

Claims (1)

[Claims] 1. A cassette main body having an opening for inserting a tape pull-out member on the apparatus side on the front surface and a lid guide portion provided on the side surface of the opening, and a tape guide provided on the front surface of the cassette main body. 1 tape covering the opening and a lid for covering the front surface and the upper surface of the tape in the opening
Provided with a front lid composed of one or two or more members and a back lid portion for covering at least the back surface of the tape, and provided with elastic biasing means for biasing the front lid in the closing direction and are rotatable. A rear lid, and when the cassette is not attached, the rear lid engages with the lid guide portion of the cassette body to prevent the front lid from rotating. A tape cassette, characterized in that the locking portion is released by pressing a protruding portion provided on the back lid portion of the rear lid so that the rear lid can rotate.