JPH0778445A - Device for preventing erroneous erasing in tape cassette - Google Patents

Abstract

PURPOSE:To facilitate the discrimination of the possibility/impossibility of an operation by providing a colored identification member for the prevention of an erroneous erasing in a plug for such prevention and structuring the plug to appear in a transparent window or in a hole for detecting identification either of which is formed in the upper half of the cassette main body. CONSTITUTION:When a triangle shaped marker 6, which is seen through a hole 9 for detecting an identification mark, is such that its triangle shaped apex faces the opposite side from the cover 12, it indicates a state incapable of recording. When an identification member 7 for the prevention of an erroneous erasing appears in a window 11 for confirming identification, it also indicates a state incapable of recording. On the other hand, when the apex of the marker 6 faces the cover 12 side, it indicates a state capable of recording so that information signal may be written in a magnetic tape. When the identification member 7 for the prevention of an erroneous erasing appears in the window 11 for confirming identification, it also indicates a state incapable of recording.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an erroneous erasure prevention device incorporated in a tape cassette for a video tape recorder, for example.

[0002]

2. Description of the Related Art For example, a data tape cassette for recording various data is provided with an erroneous erasure prevention device in order to prevent accidental erasure of already recorded information. As a tape cassette provided with an erroneous erasure prevention device, for example, the applicant of the present application has previously described the Japanese Utility Model Publication 4-16.
The one disclosed in Japanese Patent No. 305 is proposed.

In this erroneous erasure prevention device, an erroneous erasure prevention plug built in a cassette body is pushed in against the elastic force of a spring and rotated in the axial direction to switch between a recordable position and a non-recordable position. Therefore, the information recorded on the magnetic tape is not erased by mistake.

FIG. 4 shows an accidental erasure prevention plug 101. The erroneous erasure prevention plug 101 has a disc-shaped flange portion 1 provided with a groove 102 for rotating the erroneous erasure prevention plug 101 with a flat head screwdriver or the like.
On the upper end surface of 03, a triangular identification mark 104 is provided so that it can be visually identified whether the erroneous erasure prevention plug 101 is at the recordable position or the unrecordable position.

As shown in FIG. 5, the identification mark 104 faces the identification mark detection hole 107 formed in the upper half 106 of the cassette body 105.
The identification mark 104 indicates that recording is possible when the apex of the triangle faces upward as shown in FIG. 6 (a), and the apex of the triangle as shown in FIG. 6 (b). When is facing down, it indicates that recording is not possible.

[0006]

However, since the identification mark 104 is small, it is difficult to visually identify which direction the triangle is facing. Therefore, it is necessary to carefully watch the orientation of the identification mark 104 facing the identification mark detection hole 107.

Therefore, the present invention has been proposed in view of the above-mentioned conventional technical problems, and the erroneous erasure prevention plug can be immediately and visually recorded without changing the structure of the drive deck side. An object of the present invention is to provide an erroneous erasure prevention plug in a tape cassette that can identify that it is in a possible position.

[0008]

SUMMARY OF THE INVENTION The present invention is a tape cassette adapted to switch between a recordable position and a non-recordable position by rotating an axial direction while pushing an erroneous erasure prevention plug provided on a cassette body. In the erroneous erasure prevention device, the colored erroneous erasure prevention identification member is provided on the erroneous erasure prevention plug, and when the erroneous erasure prevention plug is set to either the recordable position or the unrecordable position, The above-mentioned problem is solved by allowing the identification member for preventing erroneous erasure to face the transparent window portion or the identification detection hole formed in the upper half of the cassette body.

[0009]

In the present invention, a colored erroneous erasure prevention identification member is provided on the erroneous erasure prevention plug, and this plug is configured to face the transparent window portion or the identification detection hole formed on the upper half of the cassette body. Therefore, the tape cassette can be immediately recorded visually by a change in color in the window portion or the hole when the erroneous erasure prevention identification member faces the transparent window portion or the identification detection hole and when it does not. Or you can see if it is not recordable.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described in detail below with reference to the drawings. The erroneous erasure prevention device in the tape cassette of this embodiment is a recordable position and an unrecordable position by rotating the erroneous erasure prevention plug provided on the cassette body in the axial direction while pushing it against the elastic force of the spring. By switching to the position, the information signal is written to the magnetic tape or the writing is prohibited (erroneous erasure prevention).

As shown in FIG. 1, the erroneous erasure prevention plug 1 is vertically movable in a plug accommodating portion (neither of which is shown) of a cassette information detecting portion provided in the cassette body, and has a shaft. It is arranged so that it can rotate freely. The erroneous erasure prevention plug 1 is integrally formed of, for example, synthetic resin, and has a plug body 2
Each of the upper and lower ends has a plug position switching operation unit 3 and a detection protrusion 4.

The plug body 2 is formed as a columnar body having a large diameter on the side on which the plug position switching operation portion 3 is provided and a columnar body having a small diameter on the side on which the detection protrusion 4 is provided, that is, a so-called stepped circle. Formed as a bar.

The plug position switching operation section 3 is provided as a disk body at the end of the plug body 2 on the side where the outer diameter is large. At a position passing substantially the center of the plug position switching operation portion 3, there is provided a plug rotation operation groove 5 for rotating the erroneous erasure prevention plug 1 by, for example, a minus driver to switch between a recordable position and a non-recordable position. Has been formed.

In addition, the plug position switching operation section 3 determines whether or not the erroneous erasure prevention plug 1 is at the recordable position when the erroneous erasure prevention plug 1 is switched to the recordable position and the recordable position. A marker 6 is provided to visually identify whether the position is impossible.
The marker 6 is formed as a triangular mark on the opposite side of the detection projection 4 described later with the plug rotation operation groove 5 interposed therebetween.

On the other hand, the detection projection 4 is provided as a tongue piece on the outer peripheral edge of the end of the plug body 2 opposite to the plug position switching operation part 3. The detection protrusion 4 serves to open or close the detection hole provided in the cassette information detection unit at the recordable position and the recordable position.

When the detection hole is closed by the detection projection 4, a detection pin as information detection means provided on the deck side comes into contact with the detection projection 4 and is pushed downward to detect information. Is done. On the other hand, when the detection hole is opened, the detection pin does not come into contact with the detection protrusion 4, and thus information detection is not performed.

The detecting projection 4 is provided with a positioning portion (not shown) provided in the cassette information detecting portion in order to hold the erroneous erasure prevention plug 1 at the recordable position and the unrecordable position. It comes into contact with.

In particular, the erroneous erasure prevention plug 1 of this embodiment is for erroneous erasure prevention for immediately visually identifying whether the erroneous erasure prevention plug 1 is at a recordable position or a non-recordable position. An identification member 7 is provided. The erroneous erasure prevention identification member 7 is provided on the side of the stepped portion of the plug body 2 on the side opposite to the detection protrusion 4 having a larger diameter.

The erroneous erasure prevention identification member 7 is formed as a disk body colored with a chromatic color or the like so that the identification member 7 can be identified immediately by visual observation. The erroneous erasure prevention identifying member 7 may be colored at least in the upper surface 7a that can be visually observed. For example, when the erroneous erasure preventing identifying member 7 is manufactured, the entire disc portion is colored by two-color molding. Good.

As shown in FIG. 2, the erroneous erasure prevention plug 1 configured as described above is arranged in the plug accommodating portion of the cassette information detecting portion provided in the cassette body 8 and the plug position provided at one end thereof. The switching operation section 3 faces the identification mark detecting hole 9 formed in the upper half. Further, the identification member 7 for preventing erroneous erasure of the erroneous erasure prevention plug 1 is provided with a part of the transparent window portion 10 formed in the upper half of the cassette body 8 cut out for identification confirmation window portion 1.
It is designed to face 1.

As shown in FIG. 2, when the triangular marker 6 visible from the identification mark detecting hole 9 has its apex facing away from the lid 12, an information signal to the magnetic tape is sent. Indicates that the recording is not possible and cannot be recorded. Further, when the erroneous erasure prevention identification member 7 faces the identification confirmation window portion 11, it also indicates that the recording is impossible.

On the other hand, when the apex of the marker 6 faces the lid 12 side, it means that the information signal can be written to the magnetic tape in a recordable state. When the identification member 7 for preventing erroneous erasure is not exposed in the identification confirmation window portion 11, it also indicates that the recording is possible.

As described above, in this embodiment, it is possible to determine whether the erroneous erasure prevention plug 1 is at the recordable position or the unrecordable position, depending on the orientation of the marker 6 facing the identification mark detecting hole 9. It can also be confirmed by changing the color of the window due to the colored erroneous erasure prevention identification member 7 facing the identification confirmation window 11. That is, whether or not recording is possible or not due to the change in the direction of the marker 6 and the change in the color of the window can be visually and easily identified. Therefore, it is possible to immediately know whether the tape cassette is in the recordable state or the non-recordable state without looking carefully at the tape cassette.

In the above example, the erroneous erasure prevention identification member 7 is made to face the identification detection window portion 11 formed by cutting out the transparent window portion 10, but, for example, as shown in FIG. A circular identification detection hole 13 may be provided in the vicinity of the identification mark detection hole 9 in the upper half, and the erroneous erasure prevention identification member 7 may be faced there.

In this way, the colored erroneous erasure prevention identification member 7 is visible and hidden in the identification detection window portion 13, and due to the change in color in the hole of the identification detection window portion 13. Whether or not the tape cassette is recordable or non-recordable can be easily and accurately identified at a glance. In addition, the deck side does not need to be modified because the detection pin automatically detects it.

The shape of the identification member 7 for preventing erroneous erasure, the shape of the window 11 for identification and detection, the shape of the identification detection hole 9 and the like are all examples, and are not particularly limited thereto. , Various shapes can be applied.

[0027]

As is apparent from the above description, in the erroneous erasure prevention device for the tape cassette of the present invention, the colored erroneous erasure prevention identification member is provided on the erroneous erasure prevention plug, and the erroneous erasure prevention is provided. Since the identification member for identification faces the transparent window formed in the upper half of the cassette body or the identification detection hole, it is transparent by switching the erroneous erasure prevention plug between the recordable position and the non-recordable position. The change in color of the window or the detection hole for identification can be visually and easily confirmed at a glance, and it can be immediately determined whether the erroneous erasure prevention device is operating. Further, with this configuration, it is not necessary to modify the detection mechanism on the deck side, and therefore the structure is simple.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an erroneous erasure prevention plug.

FIG. 2 is a plan view of the tape cassette showing a state in which an erroneous erasure prevention identification member of an erroneous erasure prevention plug faces a window for identification detection formed by cutting out a part of a transparent window provided in the cassette body. Is.

FIG. 3 is a plan view of the tape cassette showing a state in which an identification detection window is provided in the cassette body, and an erroneous erasure prevention identification member of an erroneous erasure prevention plug is exposed to the window.

FIG. 4 is a perspective view showing a conventional erasure prevention plug.

FIG. 5 is a plan view of a tape cassette showing a state in which a conventional erroneous erasure prevention plug faces an identification mark detection hole of a cassette body.

FIG. 6 is an enlarged plan view of an essential part showing a state in which a conventional erroneous erasure prevention plug faces an identification mark detection hole of a cassette body, (a) shows a recordable state, and (b) shows a non-recordable state. Indicates the status.

[Explanation of symbols]

 1 ... Accidental erasure prevention plug 2 ... Plug body 3 ... Plug position switching operation part 4 ... Detection protrusion 5 ... Plug rotation operation groove 6 ... Marker 7 ... Wrong Erase prevention identification member 8 ... Cassette body 9 ... Identification mark detection hole 10 ... Transparent window 11 ... Identification confirmation window 12 ... Lid 13 ... Identification detection hole

Claims (1)

[Claims] 1. An erroneous erasure prevention device in a tape cassette, which is adapted to switch between a recordable position and a non-recordable position by rotating an axial direction while pushing an erroneous erasure prevention plug provided on a cassette body, wherein The erroneous erasure prevention plug is provided with a colored erroneous erasure prevention identification member, and when the erroneous erasure prevention plug is in either the recordable position or the unrecordable position, the erroneous erasure prevention identification is performed. A device for preventing erroneous erasure in a tape cassette, characterized in that a member faces a transparent window formed in the upper half of the cassette body or a detection hole for identification.