JPH0138794Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic tape cassette provided with an accidental erasure prevention lever detection window that can be opened and closed by an opening/closing part having a breakable shielding plate.

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 an accidental erasure prevention mechanism.

As shown in FIG. 1, a conventional tape cassette has a detection window 1A located in the cassette housing 1 at a position facing the accidental erasure prevention lever of the player body (not shown).
It is known that a shielding plate 2 is formed integrally with the cassette housing 1 on one side of the detection window 1A.

FIGS. 2A and 2B are cross-sectional views of the cassette casing detection window section, illustrating the above-mentioned erroneous erasure prevention mechanism. Second
In Figure A, the detection window 1A of the cassette housing 1
is blocked by the blocking plate 2, and the tip 3A of the accidental erasure prevention lever 3 provided on the player body abuts against the blocking plate and is prevented from being inserted into the detection window 1A, making it possible to erase. . On the other hand, Fig. 2B
In this case, the shielding plate 2 is broken off and removed, the detection window 1A is opened, the accidental erasure prevention lever 3 is inserted into the detection window 1A, and the accidental erasure prevention mechanism of the player body (not shown) is activated. However, the data cannot be erased, that is, it becomes in a state where erroneous erasure is prevented. However, in the above-mentioned tape cassette, in order to prevent accidental erasure, when opening the detection window 1A, it is necessary to break off and remove the shielding plate 2. 2, if you want to erase and use it again, you will have to stick cellophane tape or the like to the detection window 1A to close it off, which is a complicated procedure, and The drawback is that it lacks reliability depending on the material of the item being worn.

In order to solve the above-mentioned drawbacks, the present invention allows the detection window to be opened and closed by sliding the opening/closing part, easily switching between the erasable state and the accidental erasing prevention state, and switching from the accidental erasing prevention state to the erasable state. By making it easy to return to the original state, and by breaking off the shielding plate when storing important records permanently, it is possible to prevent accidental erasure due to inadvertent movement of the opening/closing part. The purpose of the present invention is to provide a tape cassette with a high quality.

In order to achieve the above object, in the present invention, a part of the peripheral wall of a cassette casing in which a magnetic tape is wound internally faces an erroneous erasure prevention lever provided on the player body when the cassette casing is loaded into the player. A synthetic resin opening/closing plate is provided with a detection window, an opening/closing plate guide groove is provided around the detection window, and the opening/closing plate is reciprocated along the guide groove between a position where the detection window is opened and a position where the detection window is closed. The opening/closing plate has an engaging portion with the guide groove at one end, and a breakable blocking portion that projects into and out of the detection window at the other end, and An engaging portion is disposed relative to the cassette casing and the opening/closing plate to prevent the remaining opening/closing plate from protruding into the detection window when the opening/closing plate is broken off. be.

One embodiment of the tape cassette according to the present invention is shown in the third embodiment.
To explain with reference to FIGS. 7 to 7, a detection window 1A is provided on the circumferential wall 1B of the cassette housing 1 in the thickness direction at a position facing the erroneous erasure prevention lever of the player body (not shown), as shown in FIG. An operation window 9 is provided on the corner portion 1C side of the peripheral wall 1B of the cassette housing 1 and has one side in contact with the detection window 1A.
As shown in FIG. 4, the opening/closing part mounting guide plate 5, which slidably supports the opening/closing plate 4 for opening and closing the detection window 1A, has stepped portions at both ends along the windows 1A and 9 inside the cassette peripheral wall 1B. It is recessed by 5A and 5B. The guide plate 5 includes a guide plate 5C and a guide plate 5 so as not to block the detection window 1A.
It is divided into D. Therefore, even if the opening/closing part 4 is made of a thin synthetic resin plate, the state of preventing erroneous erasure can be detected. A gap-like guide groove 5E formed between the guide plate 5 and the cassette housing 1 is incorporated with a synthetic resin opening/closing part 4 as shown in FIG.
The opening/closing section 4 is composed of an opening/closing section shielding plate 6, a guide section engaging plate 7, and an operating section 8, as shown in FIG. The opening/closing portion shielding plate 6 can be broken off, and by breaking it off, the detection window 1A can be opened. However, the slit 6A makes it easy to break it off, which may damage the guide portion engagement plate 7. You can break it off without any trouble.

On the other hand, even when the shielding plate 6 is broken off, the guide portion engaging plate 7 can be inserted into the engaging portion 7 within the guide portion 5E.
It is held upright by both ends 7A and 7B of the sensor and does not protrude into the detection window 1A. The operating portion 8 is formed as a small hole or a small projection on the surface 7C of the engaging portion 7 exposed within the operating window 9. If the operating part 7 is formed as a small hole, it can be inserted into the handle by engaging a rod-shaped object with a thin tip such as a writing instrument, or if the operating part 8 is formed as a small projection, it can be pinched with fingers. to move within the operation window 9 and slide the opening/closing part 4 along the guide plate 5 to open the other end 7A.
The detection window 1A can be opened and closed from the side. Therefore, the detection window 1 in the embodiment configured as described above
By sliding the opening/closing part 4, A can be brought into a closed erasable state as shown in FIG. Alternatively, by breaking off the opening/closing portion shielding plate 6 and opening it as shown in FIG. 7B, it is possible to create a state in which erroneous erasure is prevented.

That is, by sliding the opening/closing part 4, the detection window 1A can be freely opened and closed, the erasable state and the accidental erasure prevention state can be easily switched, and the state can be easily returned from the accidental erasure prevention state to the erasable state. By breaking off the opening/closing part shielding plate 6, it is possible to prevent erroneous erasing due to careless movement of the opening/closing part.

In addition, since the opening/closing part 4 is made of synthetic resin material, sliding operation is smooth, and an appropriate frictional force prevents the opening/closing part 4 from moving unintentionally, resulting in a stable installation state. Furthermore, the opening/closing part 4 has a simple shape made of a single slit in a synthetic resin flat plate, so it is easy to manufacture, and since it is molded separately from the cassette housing, it can be colored differently from the cassette housing. By performing this, it is possible to easily confirm the open state of the detection window 1A.

In addition, in the description of the above-mentioned embodiment, the above-mentioned first
The same reference numerals are used for the same components as those of the conventional example shown in FIGS. 2A and 2B.

As is clear from the description of the embodiments described above, the magnetic tape cassette according to the present invention opens and closes the detection window by sliding the opening/closing part within the operation window, so that the magnetic tape cassette is in an erasable state, that is, recording is possible. state and the accidental erasure prevention state can be easily switched, and the accidental erasure prevention state can be reliably obtained by breaking off the opening/closing portion shielding plate.
Even after it is broken off, the remaining part of the opening/closing part will not block the detection window. Furthermore, since the opening/closing part uses a synthetic resin material, the installation condition is stable and the opening/closing operation is smooth. This has the effect of being highly practical 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 longitudinal cross-sectional views of the detection window of the cassette casing, illustrating the erasure prevention mechanism;
FIG. 2A shows an erasable state, and FIG. 2B shows an erroneous erasure prevention state. FIG. 3 shows an embodiment of the present invention,
FIG. 4 is a perspective view of the appearance in a state where it can be erased by sliding the opening/closing part. FIG. 4 is a vertical cross-sectional view of the main part of the detection window section in the above embodiment. FIG. 5 is a cross-sectional view taken along the line AA in FIG. 4. FIG. 6 is an enlarged plan view of the opening/closing section in the above embodiment. Figure 7 A, B
7A is a schematic perspective view of the main part of the detection window section of the above embodiment, FIG. 7A shows a state in which accidental erasure is prevented by sliding operation of the opening/closing section, and FIG. 7B shows a state in which erroneous erasure is prevented by breaking off the opening/closing section blocking plate Indicates accidental erasure prevention status. 1...Cassette housing, 1A...detection window, 2...
Closing plate, 3... Erroneous erasure prevention lever (attached to the player body), 4... Opening/closing part, 5... Opening/closing part installation guide plate, 6... Opening/closing part shielding plate, 7... Opening/closing part guide part engagement plate , 8...operation unit, 9...operation window.

Claims (1)

[Scope of utility model registration request] A detection window is provided in a part of the peripheral wall of the cassette casing in which the magnetic tape is wound inside, and faces the erroneous erasure prevention lever provided on the player body when the cassette casing is loaded into the player. An opening/closing plate guide groove is provided in the opening/closing plate, and the opening/closing plate is made of synthetic resin and is reciprocated along the guide groove between a position where the detection window is opened and a position where it is closed. It has an engaging part with the guide groove and a breakable blocking part that protrudes into and out of the detection window on the other end side, and when the blocking part is broken off, the opening/closing plate remains. A tape cassette, characterized in that an engaging portion for preventing the opening/closing plate portion from protruding into the detection window is disposed relative to the cassette casing and the opening/closing plate.