JPH0138793Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic tape cassette having a lever detection window for preventing accidental erasure that can be opened and closed.

Magnetic tape cassettes are capable of repeatedly recording and reproducing audio and images, but in order to preserve necessary recordings, the player body and cassette housing are equipped with a mechanism to prevent accidental erasure.

By the way, as shown in FIG. 1, in a conventional tape cassette, a detection window 1A is provided on the peripheral wall 1B of the cassette housing 1 so as to face the accidental erasure prevention lever of the player body (not shown), and a detection window 1A is provided on one side of the detection window 1A. It is known that a shielding plate 2 is provided.

FIG. 2 is a cross-sectional view of the cassette case detection window section for explaining the above-mentioned erroneous erasure prevention mechanism. Then, the tip 3A of the erroneous erasing prevention lever 3 provided on the player body abuts against the shielding plate 2, preventing it from being inserted into the detection window 1A, making erasing possible. On the other hand, in B, the shielding plate 2 is broken off and removed, and the detection window 1 is removed.
A is opened and the accidental erasure prevention lever 3 is in the detection window 1.
When inserted into A, an accidental erasure prevention mechanism of the player body (not shown) is activated, making erasure impossible.

However, in order to open the detection window 1A in order to prevent accidental erasure in the tape cassette, it is necessary to break off and remove the shielding plate 2.
Once the shielding plate 2 is broken off to save the records, if the records are to be erased and used again, the window 1A must be covered with cellophane tape or the like. This method is complicated, and depending on the material of the material to which it is attached, it may be unreliable. In addition, the cassette housing peripheral wall 1B
Because the slit formed around the periphery of the shielding plate 2 is narrow, it is difficult to break off the shielding plate 2, and a small piece of the shielding plate 2 that is broken off is attached to the detection window 1A.
There was also the fear that it would get stuck inside.

In order to solve the above-mentioned drawbacks, the present invention has a detection window that can be opened and closed using an opening/closing plate, so that it can be easily switched between an erasable state and an accidental erasure prevention state, and it is easy to return from an accidental erasure prevention state to an erasable state. It is an object of the present invention to provide a tape cassette which is designed to obtain a tape cassette.

In order to achieve the above object, the present invention has a part of the peripheral wall on one side of the corner of the cassette casing in which magnetic tape is wound inside, and an erroneous eraser is provided on the player body when the cassette cassette is loaded into the player. A detection window facing the prevention lever is provided, and an opening/closing plate operation window is provided in a part of the peripheral wall on the other side of the corner, and a line extends from these detection windows to the inside of the opening/closing plate operation window and extends across both windows. An opening/closing plate installation guide part is provided, and a band-shaped opening/closing plate made of a flexible synthetic resin material is assembled into the guide part in an arc-shaped state, so that one end of the opening/closing plate faces the detection window, and the other end is By facing the opening/closing plate operation window and sliding the other end of the opening/closing plate within the opening/closing plate operation window, one of the opening/closing plates protrudes into and out of the detection window to open/close the detection window. It is characterized by the fact that it can be obtained.

One embodiment of the tape cassette according to the present invention is shown in the third embodiment.
To explain with reference to FIG. 4, the cassette housing 1
A detection window 1A is provided on the peripheral wall 1B facing the accidental erasure prevention lever of the player body, which is one side of the corner portion 1D of the peripheral wall in the thickness direction, and a detection window 1A is provided on the other peripheral wall 1C of the corner portion 1D. Window 6 has been opened. Therefore, each of these windows 1A, 6 is provided in different peripheral walls 1B, 1C in a direction perpendicular to each other. 4 is an opening/closing plate installation guide plate, with stepped portions 4 at both ends.
A, 4B are recessed inward of each of the peripheral walls 1B, 1C, and the midway portion 4D is bent into an arc shape. A gap-shaped guide portion 4 is formed between the guide plate 4 and each peripheral wall 1B, 1C and continues in an L-shape.
A band-shaped opening/closing plate 5 made of a flexible synthetic resin material is incorporated in C. This opening/closing plate 5 is bent into an arc shape at a midway portion 5A corresponding to the midway portion 4D. Reference numeral 7 designates an opening/closing plate operating portion provided at one end 5B side of the strip-shaped opening/closing plate 5, and is formed as a small hole or a small protrusion. If the operating part 7 is formed as a small hole, it can be inserted by engaging a thin rod-shaped object such as a writing instrument, or if the operating part 7 is formed as a small protrusion, it can be pinched with fingers. By moving within the operation window 6, the opening/closing plate 5 can be slid along the guide plate 4, and the detection window 1A can be opened and closed on the other end 5C side. When the detection window 1A is open, it is in a state to prevent accidental erasure, and when it is closed, it is in an erasable state, that is, in a recordable state. In addition, since the opening/closing plate 5 is made of a flexible synthetic resin material, it can be easily deformed along the guide portion 4C during sliding operation, and the movement is smooth.
Since it is forcibly bent into an arc shape at A, after it is moved, it comes into pressure contact with the cassette housing 1 or the guide plate 4 due to its elasticity, and is in a stable installation state without being accidentally moved.

The opening/closing plate 5 is molded separately from the cassette housing, but it is easy to manufacture as it can simply be made as a band-shaped flat plate from flexible synthetic resin and there is no need to mold it into a bent state. By applying a different color to the cassette housing, the detection window 1A
The open state of the door can be easily confirmed. Also,
The above-mentioned opening/closing can be confirmed not only at the detection window 1A but also inside the operation window 6 on another peripheral wall 1C different from the one on which the detection window 1A is opened. Even when they are stored in parallel, they can be easily identified from any position on each of the peripheral walls 1B and 1C.

In the magnetic tape cassette according to the present invention, the detection window is opened and closed by moving the opening/closing plate.
It is possible to easily switch between the erasable state and the accidental erasure prevention state. In addition, since the opening/closing plate uses a flexible synthetic resin material arranged in an arc shape, the assembled state is stable, and the opening/closing operation is smooth and can be opened/closed reliably. There are great practical effects as described above.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of a conventional tape cassette. FIGS. 2A and 2B are vertical cross-sectional views of the detection window portion of the cassette casing to explain the accidental erasure prevention mechanism, with A showing the erasable state and B showing the accidental erasure prevention state. Third
3 and 4 show an embodiment of the present invention, with FIG. 3 being a schematic perspective view and FIG. 4 being a cross-sectional view of the main part. 1...Tape cassette, 1A...Detection window, 2...
...Blocking plate, 3... Erroneous erasure prevention lever (attached to the player main body), 4... Opening/closing plate installation guide plate, 5... Opening/closing plate, 6... Operation window, 7... Operating unit.

Claims (1)

[Scope of utility model registration request] A detection window is provided in a part of the peripheral wall on one side of the corner of the cassette casing in which magnetic tape is wound inside, and faces the erroneous erasure prevention lever provided on the player body when the cassette cassette is loaded into the player. An opening/closing plate operation window is provided in a part of the peripheral wall on the other side of the corner, and an opening/closing plate installation guide part is provided from these detection windows to the inside of the opening/closing plate operation window, extending from both windows, and inside this guide part. A band-shaped opening/closing plate made of a flexible synthetic resin material is assembled in an arc-shaped state, one end of the opening/closing plate faces the detection window, and the other end faces the opening/closing plate operation window. A tape cassette characterized in that one end of the opening/closing plate can be moved in and out of the detection window by sliding the other end of the opening/closing plate within the operation window to open and close the detection window.