JP3552424B2 - Recording media device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a recording medium device suitable for use in a tape cassette such as a video tape, and more particularly to a recording medium capable of preventing inconvenience in which another recording information is erroneously overwritten on a tape in a recording state. It concerns the device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, tape cassettes such as audio tapes and video tapes are provided with an erroneous erasure prevention mechanism for preventing information recorded on the tape from being erroneously erased. As the erroneous erasure prevention mechanism, a detection hole is opened and closed by an erroneous erasure prevention plug movable into the cassette housing, and a recording / reproducing state and a reproducing operation are possible but a recording impossible state (a so-called erasure preventing state). And a cassette that is integrated with the cassette housing. When the detection claw is present, a recording / reproducing state is established. When the detection claw is broken off, reproduction is possible, but recording is possible. There is a mechanism that disables it. Further, as another erroneous erasure prevention mechanism, the applicant of the present invention breaks a detection claw provided on a part of the erroneous erasure prevention plug according to Japanese Utility Model Publication No. 6-21107, so that the erroneous erasure prevention plug is moved regardless of the moving position. There is proposed a mechanism for preventing erroneous erasure of a tape cassette or the like which is permanently set in an erroneous erasure prevention state so that recorded contents are not erroneously erased.
[0003]
[Problems to be solved by the invention]
By the way, in any of the above-mentioned conventional erasure prevention mechanisms, in the recordable / reproducible state, it was possible to overwrite the already recorded tape. This means that when the tape is rewound and played back to check the recorded contents, the user forgets that the tape has been rewound and performs recording (overwrite recording) from the rewound part to the already recorded part. Therefore, there is a decisive inconvenience that the previously recorded contents are erased.
[0004]
In particular, such a problem occurs in a video camera having a built-in liquid crystal monitor, for example, since a part of an image can be easily reproduced and viewed on the liquid crystal monitor after shooting. It is a thing.
[0005]
The present invention has been made to solve the above-described problem, and has as its object to provide a recording medium device that prevents information from being overwritten on a recording medium on which information is recorded by a sliding operation of a switching plug. I do.
[0006]
It is another object of the present invention to provide a recording medium device in which the use mode can be switched by folding a plurality of detection claws, and the detection claws are arranged so that the detection claws can be easily broken.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a recording medium device according to the present invention is a recording medium device having switching means for selectively switching a use mode of a recording medium, wherein the switching means is capable of switching by folding a detection claw. And the order in which the detection claws are cut off is such that when the first detection claw is cut off, the second detection claw is easily cut off.
[0008]
With this configuration, it is possible to accurately perform the operation procedure of the usage mode of the recording medium device without making a mistake in the order of cutting the detection claws.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an example in which the recording medium device according to the present invention is applied to a video tape cassette provided with an erroneous erasure prevention mechanism, which is a means for switching its use mode, will be described with reference to the drawings.
[0012]
FIG. 1 is a perspective view of the video tape cassette as viewed from the rear side to the bottom side.
In the cassette housing indicated by reference numeral 1 as a whole, an upper half 2 and a lower half 3 are integrally formed. Two tape reels 4, 5 around which a magnetic tape (not shown) is wound are accommodated in the cassette housing 1, and are rotatable by reel openings 3 a, 3 b formed on the bottom surface of the lower half 3. Reference numeral 6 denotes a lid provided on the front side of the cassette housing 1 so as to be openable and closable.
[0013]
An erasure prevention mechanism 7 is provided on one side of the rear side of the upper half 2. The erroneous erasure prevention mechanism 7 includes an operation window 8 opened on the back surface of the upper half 2, an erroneous erasure prevention plug 9 supported by the operation window 8 and sliding, and an erroneous erasure opened on the bottom of the lower half 3. Two detection holes 10 and 11 selectively opened and closed by the sliding operation of the erasure prevention plug 9, and a detection pin 12 provided in a recording / reproducing device (not shown) that turns on and off according to the open / close state of the detection holes 10 and 11. , 13.
[0014]
As shown in FIG. 2, the erroneous erasure prevention plug 9 has a finger-hanging piece 14 in a portion formed entirely in a plate shape, and also has an L-shaped closing piece 15 extending integrally downward.
[0015]
Erase prevention plug 9 erroneous described above to face the slidable operating window portion 8 of finger rest 14, three recessed portions 8a formed at both ends and an intermediate portion of the operation window 8, 8b, the finger rest to 8c The fourteen ends are selectively engaged and positioned. Here, when the finger hanging piece 14 is positioned in the recess 8a of the operation window 8, the closing piece 15 closes the detection hole 10, and when the finger hanging piece 14 is positioned in the recess 8b, the closing piece is closed. 15 closes the detection hole 11, and when the finger hook 14 is positioned in the recess 8c, both detection holes 10, 11 are opened.
[0016]
Further, details of the erroneous erasure prevention mechanism 7 will be described with reference to FIGS.
The position shown in FIG. 3 where the finger hook 14 of the erroneous erasure prevention plug 9 is positioned in the recess 8a at one end of the operation window 8 is a REC (recordable state) position. Reference numeral 10 is closed by the closing piece 15 of the erroneous erasure prevention plug 9, and the detection hole 11 is opened. Accordingly, the detection pin 12 corresponding to the detection hole 10 is turned on, and the detection pin 13 corresponding to the detection hole 11 is turned off, thereby electrically detecting the REC position. That is, depending on the REC position, the cassette is in a state in which WRITE ONCE (initial recording) on a virgin tape and a reproducing operation or overwrite recording on a tape already in a recording state are enabled.
[0017]
Further, the position shown in FIG. 4 where the finger hook 14 of the erroneous erasure prevention plug 9 is positioned in the concave portion 8b in the middle of the operation window 8 is a SAVE (erroneous erasure prevention state) position. The detection hole 10 is opened, and the detection hole 11 is closed by the closing piece 15. In this case, the detection pin 12 corresponding to the detection hole 10 is turned off, and the detection pin 13 corresponding to the detection hole 11 is turned on, thereby electrically detecting the SAVE position. In other words, the cassette is in an erroneous erasure prevention state by the SAVE position, and the reproducing operation is possible, but the WRITE ONCE on the virgin tape and the overwriting recording on the already recorded tape cannot be performed.
[0018]
Further, the position shown in FIG. 5 where the finger hook 14 of the erroneous erasure prevention plug 9 is positioned in the recess 8c on the other end side of the operation window 8 is the WRITE ONCE position. , 11 are both open. Therefore, the WRITE ONCE position is electrically detected by turning off both the detection pins 12 and 13. At this WRITE ONCE position, WRITE ONCE on the virgin tape is possible, but overwrite recording on the already recorded tape cannot be performed.
[0019]
In other words, during shooting with a video camera, if the tape cassette is used with the erroneous erasure prevention plug 9 set at the WRITE ONCE position, when the tape is rewound once and played back to check the recorded contents, Even if you forget to rewind and start shooting from the part where you rewinded, if there is anything recorded on the tape, for example, a warning sound will be issued so that recording can not start, and nothing is recorded on the tape In that case, recording can be started.
[0020]
FIG. 6 is a comparison diagram of the functions of the plug type erroneous erasure prevention mechanism according to the present invention and a conventional erroneous erasure prevention mechanism.
[0021]
Here, whether the tape is in the recording state or the unrecorded state can be detected by, for example, detecting the tape on which the tape is running with a magnetoresistive head (MR head) or the like. The detection position of the magnetoresistive head can be detected by independently arranging it on the running tape portion on the tape supply side, by providing it on a tape guide, or by providing it on a rotating head drum. The detection of whether the tape is in the recorded state or the unrecorded state may be performed by using a detecting unit other than the magnetoresistive head.
[0022]
FIG. 7 shows an example in which the erroneous erasure prevention mechanism as the switching means is applied to a VHS tape cassette having a detection claw of a tear-off claw type.
[0023]
An upper half 21 and a lower half 22 are integrally formed in a cassette housing indicated by reference numeral 20 as a whole, and a lid 23 that can be opened and closed is provided on the front side of the cassette housing 20.
[0024]
On one side on the back side of the lower half 22, a erroneous erasure prevention mechanism 24 of a tearing claw type is provided. The erroneous erasure prevention mechanism 24 is integrally connected only to the lower half 22 with the lower half 22 and the other three sides are separated from the first detection claw 25, and adjacent to the side of the first detection claw 25. Only the side opposite to the detection claw 25 is integrally connected to the lower half 22 and the other three sides are separated from the second detection claw 26 and the first and second detection claws provided on a recording / reproducing apparatus (not shown). The detection pins 27 and 28 are turned on and off according to the open / close state of the two detection claws 25 and 26.
[0025]
The first and second detection claws 25 and 26 are cut off in order, and the first detection claw 15 is first cut off and then the second detection claw 26 is cut off.
[0026]
The details of the erroneous erasure prevention mechanism 24 will be described with reference to FIGS.
As shown in FIG. 7, when both the first and second detection claws 25 and 26 are present, the REC (recordable) state is established. Therefore, both the detection pins 27 and 28 are turned on, and the REC enabled state is set. Is electrically detected. In other words, depending on the REC-enabled state, the cassette is in a state in which WRITE ONCE to a virgin tape and a reproducing operation or overwrite recording on a tape already in a recording state is possible.
[0027]
When the first detection claw 25 is cut off as shown in FIG. 8A, the WRITEONCE (initial recording) is enabled, whereby one of the first detection claws 25 corresponding to the part of the first detection claw 25 that has been cut off is obtained. The detection pin 27 is turned off, the detection pin 28 corresponding to the second detection claw 26 is turned on, and electrically detects that the WRITE ONCE is possible. In other words, in this WRITE ONCE enabled state, WRITE ONCE on the virgin tape is possible, but overwrite recording on the already recorded tape is not possible.
[0028]
Further, as shown in FIG. 8B, when the first and second detection claws 25 and 26 are cut off, the SAVE (erroneous erasure prevention) state is established, whereby both detection pins 27 and 28 are turned off. , SAVE state is electrically detected. In other words, the cassette is in the erroneous erasure prevention state by the SAVE state, and the reproducing operation is possible, but the WRITE ONCE on the virgin tape and the overwrite recording on the already recorded tape cannot be performed.
[0029]
In other words, during shooting by the video camera, if the tape cassette was used in a state where the first detection claw 25 of the tape cassette was cut off and set to WRITE ONCE, the tape was once rewound to reproduce the recorded content in order to check the recorded contents. Even if you forget to rewind and start shooting from the part where you rewinded, if there is anything recorded on the tape, for example, a warning sound is issued so that recording can not be started, and nothing is recorded on the tape. If not, recording can begin.
[0030]
In addition, in the case of the split claw method, the first detection claw 25 is generally cut by inserting a tool or the like into a gap between the cut half and the first detection claw 25. After the removal, a finger can be inserted into the opening 25a formed after the removal, so that the second detection claw 26 can be easily folded without a tool.
[0031]
In addition, in order to facilitate the breaking of the first detection claw 25, a notch is formed in the upper half 2 adjacent to the upper side of the detection claw 25 (not shown) so that a finger is formed in this opening. Is inserted, the first detection claw can be easily cut off without a tool.
[0032]
On the other hand, the erroneous erasure prevention mechanism of the tear-off claw type can be widely applied other than the overwrite prevention function.
[0033]
For example, in after-recording (after-recording) using a recording / reproducing apparatus, in the VHS system, it is possible to record video and audio once with a fixed head and then post-record only audio later. However, it is possible to post-record by adding or exchanging PCM audio recordings later. In such an after-recording operation, the sound is switched by operating the after-recording button of the recording / reproducing apparatus. However, there is a concern that the video may not be erased by mistake.
[0034]
At this time, when the first detection claw 25 is cut off as shown in FIG. 8A, the state is set to the “image erasure impossible, sound recording enabled” state, and when the second detection claw 26 is also cut off, the “video and If the state of “sound erasure is impossible” is set, there is an advantage that the editing operation can be reliably performed without making a mistake in the operation procedure.
[0035]
The present invention is not limited to the embodiment described above and shown in the drawings, and various modifications can be made without departing from the scope of the invention.
[0036]
In the embodiment, the case where the erroneous erasure prevention mechanism is of the plug type and the claw type that can be switched in three stages has been described. However, the present invention is also applicable to a case where the use mode of the recording medium device can be switched in three or more stages. It is.
[0037]
Further, the recording medium device of the present invention is widely applicable to tape cassettes, digital video cassettes, and disk cartridges for 8 mm video in which the erroneous erasure prevention mechanism employs a plug system. Further, the present invention can be widely applied to a video cassette or a compact cassette for audio of a VHS system or a beta-max system in which an erroneous erasure prevention mechanism employs a tear-off claw system.
[0038]
【The invention's effect】
As described above, the recording medium device of the present invention is a recording medium device having switching means for selectively switching the use mode of the recording medium, wherein the switching means comprises a plurality of detection means that can be switched by breaking off a detection claw. The order in which the detection claws are cut off is made so that the first detection claw is easily broken off when the first detection claw is broken off. Therefore, there is an effect that the operation procedure of the usage mode of the recording medium device can be accurately performed.
[Brief description of the drawings]
FIG. 1 is a perspective view of a tape cassette in a case where an erroneous erasure preventing mechanism for overwriting according to the present invention is a plug type.
FIG. 2 is a perspective view of an erasure prevention plug.
FIG. 3 is an explanatory diagram of a REC position where an erroneous erasure prevention mechanism is provided.
FIG. 4 is an explanatory diagram of a SAVE position.
FIG. 5 is an explanatory diagram of a WRITE ONCE position.
FIG. 6 is a comparison diagram of functions of the present invention and a conventional erasure prevention mechanism.
FIG. 7 is a perspective view of the tape cassette in a REC-enabled state in a case where the erroneous erasure prevention mechanism for overwriting is of a claw-claw type.
FIG. 8A is an explanatory diagram of a WRITE ONCE state.
B is an explanatory diagram of the SAVE state.
[Explanation of symbols]
1 cassette housing, 2 upper half, 3 lower half, 7 erasure prevention mechanism, 8 operation window, 9 erasure prevention plug, 10, 11 detection hole, 12, 13 detection pin, 15 closing piece, 24 erasure prevention Mechanism, 25, 26 Erase prevention claw, 27, 28 Detection pin

Claims (1)

In a recording medium device having a switching unit for selectively switching a use mode of a recording medium,
It said switching means comprises a plurality of detecting projection switchable by taking folding detection claws, the first detection nail broken off the break-off of the second detecting pawl tends becomes so the detection claw takes folding A recording medium device characterized by being ordered.

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