JPH10112161A - Recording medium device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent erasure of recording contents in a reproducible video camera, etc., by providing a mode possible for initial recording and prohibiting superscription onto a recorded tape in addition to the mode possible for the initial recording and superscription recording, and the mode of erroneous erase prevention in slide operation of a switch plug. SOLUTION: An erase preventive plug 9 having a fingure-put piece 14 and downward prolonging an L-shaped block piece 15 is slide moved to an operation part window 8 opened to the rear of a half, and detection holes 10, 11 are selectively opened/closed, and pins 12, 13 are on/off operated. At this time, the fingure-put piece 14 is engaged with recessed parts 8a, 8b, 8c provided on both ends and the center of the window part 8, and the plug 9 is positioned. In the state that the fingure-put piece 14 is engaged with the recessed parts 8a, 8b, the detection holes 10, 11 are blocked respectively by the block piece 15, and the pins 12, 13 are turned on respectively to be made a recordable state, and an initial recordable/reproducible state. Further, when the piece 14 is engaged with the 8c, the detection holes 10, 11 are opened also, and the pins 12, 13 are turned off to be made an initial recordable and superscription onto the recorded tape protective state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. 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.
In particular, the present invention relates to a recording medium device capable of preventing an inconvenience of another recording information being erroneously overwritten on a recording tape.

[0002]

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. The erroneous erasure prevention mechanism includes a detection hole which is opened and closed by an erroneous erasure prevention plug made movable in 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). A detection claw integrated with the cassette housing. When the detection claw is present, a recording / reproducing state is established. There is a mechanism that disables it. Further, as another erroneous erasure prevention mechanism, the applicant of the present invention breaks off a detection claw provided on a part of the erroneous erasure prevention plug according to Japanese Utility Model Publication No. 6-21107, regardless of the position of the erroneous erasure prevention plug. A mechanism for preventing erroneous erasure of a tape cassette or the like in which the erroneous erasure is permanently set to prevent the recorded contents from being erroneously erased is proposed.

[0003]

However, in any of the above-described conventional erasure prevention mechanisms, recording / recording is not possible.
In the reproducible state, it was possible to overwrite the already recorded tape. This means that when you try to check the recorded content, rewind the tape once and play it back,
By forgetting to rewind and recording from the unwound part to the already recorded part (overwrite recording),
There has been a decisive inconvenience of erasing previously recorded contents.

[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 what came to be.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a recording medium device for preventing information from being overwritten on a recording medium on which information is recorded by a sliding operation of a switching plug. With the goal.

It is another object of the present invention to obtain a recording medium device in which the use mode can be switched by folding off a plurality of detection claws, and the detection claws are arranged so that the detection claws can be easily broken. And

[0007]

In order to achieve the above object, a recording medium device according to the present invention comprises a switching device for selectively switching a mode of use of a recording medium. An overwriting prevention mechanism which comprises a switching plug which is slidably operable, and wherein the switching means is capable of recording recorded information on an unrecorded recording medium, but preventing overwriting on a recording medium on which information is recorded. It was made to have.

With this configuration, it is possible to prevent the recording portion from being erroneously overwritten on the already recorded tape portion.

Further, the recording medium device according to 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 which can be switched by breaking a detection claw. The detection claws are arranged in order so that the detection claws can be easily broken.

With this configuration, the operating procedure of the mode of use of the recording medium device can be accurately performed without making a mistake in the order of cutting the detection claws.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A recording medium device according to the present invention will be described below with reference to the drawings, taking an example in which the recording medium device is applied to a video tape cassette provided with an erroneous erasure prevention mechanism which is a means for switching the use mode.

FIG. 1 is a perspective view of a 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 and 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 and 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.

An erasure prevention mechanism 7 is provided on one side of the back 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.

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. .

The erroneous erasure prevention plug 9 described above is a
4 slidably faces the operation window 8, and three recesses 8 a, formed at both ends and an intermediate portion of the operation window 8, respectively.
The ends of the operation window 8 are selectively engaged with and positioned at 8b and 8c. Here, when the finger hanging piece 14 is positioned in the concave portion 8a of the operation window section 8, the closing piece 15 closes the detection hole 10, and the finger hanging piece 14 is closed.
When is positioned in the recess 8b, the closing piece 15 closes the detection hole 11, and when the finger hook 14 is positioned in the recess 8c, both the detection holes 10, 11 are opened. I have.

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. In other words, the WRITE position to the virgin tape is added to the cassette depending on the REC position.
(Initial recording) and a state in which a reproduction operation or overwrite recording can be performed on a tape that is already in a recording state.

Further, the finger hook 14 of the erroneous erasure prevention plug 9 is used.
4 is a SAVE (erroneous erasure prevention state) position in which the detection hole 10 is opened and the detection hole 11 is It 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. That is, the cassette is in the 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.

Furthermore, the finger hook 1 of the erroneous erasure prevention plug 9
The position shown in FIG. 5 where 4 is positioned in the concave portion 8c on the other end side of the operation window portion 8 is a WRITE ONCE position, and at this time, the detection holes 10 and 11 are both open. Therefore, the WRITE ONCE position is electrically detected by turning off 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.

That is, during photographing by the video camera, the erroneous erasure prevention plug 9 of the tape cassette is
If you use it with the tape set to the NCE position, if you rewind and play the tape once to check the recorded contents, and forget to rewind and start shooting from the part where the tape was rewound, If something is recorded on the tape, for example, a warning sound is issued so that recording cannot be started, and if nothing is recorded on the tape, recording can be started.

FIG. 6 is a comparison diagram of the functions of the plug type erroneous erasure prevention mechanism according to the present invention and the conventional erasure prevention mechanism.

Here, the detection of whether the tape is in a recorded state or in an unrecorded state can be performed, for example, by detecting the tape during tape running with a magnetoresistive head (MR head) or the like. The detection position of the magnetoresistive head can be detected by independently arranging it in the running tape portion on the tape supply side, by providing it with 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.

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.

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.

On one side of the back side of the lower half 22, an erroneous erasure prevention mechanism 24 of a tearing claw type is provided. This erroneous erasure prevention mechanism 24 is connected to the lower half 22 only on the lower side integrally, and the first detection claw 2 is separated from the other three sides.
5, only the side adjacent to the side of the first detection claw 25 and opposite to the detection claw 25 is integrally connected to the lower half 22, and the other two sides are separated. Detection claw 2
6 and first and second recording / reproducing devices (not shown)
The detection pins 27 and 28 are turned on and off in accordance with the open / close state of the detection claws 25 and 26.

The first and second detection claws 25 and 26 are cut off in order. The first detection claw 15 is first cut off, and then the second detection claw 26 is cut off.

FIG. 7 shows details of the erroneous erasure prevention mechanism 24 described above.
This will be described with reference to FIGS. When both the first and second detection claws 25 and 26 are present as shown in FIG.
(Recordable) state, and therefore both detection pins 27,
28 is turned on and electrically detects that it is in a REC enabled state. In other words, depending on the REC enabled state, the cassette is in a state in which WRITE ONCE to a pagin tape and a reproducing operation or overwrite recording on a tape which is already in a recording state is possible.

As shown in FIG. 8A, the first detection claw 2
5 is in a state in which WRITEONCE (initial recording) is possible, whereby one of the detection pins 27 corresponding to the part of the first detection claw 25 that has been cut off is turned off, and the second detection claw is turned off. The detection pin 28 corresponding to 26 is turned on, and electrically detects that WRITE ONCE is possible. In other words, this WRITE O
WRITE to virgin tape when NCE is possible
Although NCE is possible, overwriting on a tape that is already in a recording state cannot be performed.

Further, as shown in FIG.
When the detection claws 25 and 26 of FIG.
In this state, the detection pins 27 and 28 are turned off, thereby electrically detecting the SAVE state. That is, 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 overwriting recording on the already-recorded tape cannot be performed.

That is, during the photographing by the video camera, the first detection claw 25 of the tape cassette is
If you use it with TE ONCE, you can rewind the tape to check the recorded content and play it back. Even if you forget to rewind and start shooting from the rewinded part, When something is recorded, for example, a warning sound is issued so that recording cannot be started, and when nothing is recorded on the tape, recording can be started.

Further, in the case of the cutting 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. After the 25 has been cut off, a finger can be inserted into the opening 25a formed after the 25 is cut off, whereby the second detection claw 26 can be easily cut off without a tool.

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 this opening is formed. By inserting a finger into the section, the first detection claw can be easily cut off without a tool.

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.

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.
Even in the case of millimeter video, 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 fear that the video may not be erased by mistake.

At this time, when the first detection claw 25 is broken off as shown in FIG. 8A, the state is set to "image erasure impossible, sound recording possible", and when the second detection claw 26 is also broken off. If the state of “video and audio erasure is impossible” is set, there is an advantage that the editing operation can be performed reliably without mistake in the operation procedure.

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.

Although the embodiment has been described with respect to the case where the erroneous erasure prevention mechanism is of a type in which the plug system and the breaking claw system can be switched in three stages, other cases in which the usage of the recording medium device can be switched in three or more stages. Is also applicable.

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. In addition, 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 claw claw system.

[0038]

As described above, according to the recording medium apparatus of the present invention, there is provided a recording medium apparatus having switching means for selectively switching the use mode of a recording medium, in which the switching means is selectively slidable. It is made up of a plug, and the switching means has an overwrite prevention mechanism that can record information on an unrecorded recording medium, but prevents overwriting on a recording medium on which information is recorded. If nothing has been recorded on the recording medium, recording can be started, and it is ensured that recording is not overwritten on the part of the recording medium that has already been recorded and that the previous recording part is erased. There is an effect that can be done. This is particularly convenient because it is now possible to easily reproduce and confirm the image captured by the liquid crystal monitor built in the video camera, and to prevent such a trouble beforehand.

The overwrite protection mechanism is provided in an erroneous erasure prevention mechanism that can be selected between a recordable state and a non-recordable state. Although recordable information can be recorded on an unrecorded recording medium, information is not recorded. By providing an overwrite-prevention position for preventing overwriting on a recording medium that has been set, the position in the record / reproducible state and the unrecordable state are set to different overwrite-prevention positions. Although recording information can be recorded on the recording medium, a function can be set to prevent the recording medium on which the information is recorded from being accidentally overwritten.

In addition, since the recording medium device can be applied to a tape cassette for recording and reproducing audio signals or video signals, overwrite recording on such a tape can be prevented.

Further, since the recording medium device can be applied to a disk-type recording medium in which a magnetic disk or a magneto-optical disk or the like is housed in a cartridge, overwrite recording on the disk-type recording medium can be prevented.

Further, the recording medium device according to 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 which can be switched by breaking a detection claw. Since the detection claws are formed in order such that the detection claws can be easily broken, the order of the detection claws is not mistaken. Can be done accurately.

The detection claw can record information on an unrecorded recording medium, but has an overwriting prevention claw that prevents overwriting on a recording medium on which information is recorded. In addition, there is an effect that it is possible to surely prevent a trouble that the recording is erroneously overwritten on the recording medium portion and the previous recording portion is erased.

Further, since the recording medium device having the folding detection claw can be applied to a tape cassette for recording and reproducing an audio signal or a video signal, the operating procedure of the usage mode of this kind of tape cassette can be improved. Can be done accurately.

In addition, the recording medium device can be applied to a disk-type recording medium in which a magnetic disk or a magneto-optical disk or the like is housed in a cartridge, so that the operation procedure of the usage mode of the disk-type recording medium can be accurately performed. Can be.

[Brief description of the drawings]

FIG. 1 is a perspective view of a tape cassette in a case where an erroneous erasure prevention mechanism for preventing overwriting according to the present invention is a plug type.

FIG. 2 is a perspective view of an erroneous 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 view of a WRITE ONCE position.

FIG. 6 is a comparison diagram of the functions of the present invention and the 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 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
Accidental erasure prevention mechanism, 8 operation windows, 9 accidental erasure prevention plug,
10, 11 detection hole, 12, 13 detection pin, 15 closing piece, 24 erroneous erasure prevention mechanism, 25, 26 erroneous erasure prevention claw, 27, 28 detection pin

Claims (8)

[Claims] 1. A recording medium device having a switching means for selectively switching a use mode of a recording medium, wherein the switching means comprises a switching plug which is selectively slidable, and an unrecorded recording medium is provided on the switching means. What is claimed is: 1. A recording medium device comprising: a recording medium on which recording information can be recorded, and a recording medium on which the information is recorded is provided with an overwrite prevention mechanism for preventing overwriting recording. 2. The recording medium device according to claim 1, wherein the overwrite protection mechanism is provided in an erroneous erasure prevention mechanism that is selectable between a recordable state and a non-recordable state. A recording medium device which has an overwrite protection position for preventing overwriting on a recording medium on which information is recorded, but which is recordable. 3. The recording medium device according to claim 1, wherein said recording medium device is a tape cassette for recording and reproducing an audio signal or a video signal. 4. The recording medium device according to claim 1, wherein said recording medium device is a disk-type recording medium in which a magnetic disk or a magneto-optical disk is accommodated in a cartridge. 5. A recording medium device having a switching means for selectively switching a use mode of a recording medium, wherein the switching means comprises a plurality of detection claws which can be switched by folding the detection claws, When the detection claw is broken off, the second
A recording medium device, wherein the detection claws are arranged in a sequence so that the detection claws can be easily broken. 6. The recording medium device according to claim 5, wherein the detection claw can record information on an unrecorded recording medium, but does not overwrite the information on the recording medium on which the information is recorded. A recording medium device, comprising: 7. The recording medium device according to claim 5, wherein the recording medium device is a tape cassette for recording and reproducing an audio signal or a video signal. 8. The recording medium device according to claim 5, wherein said recording medium device is a disk-type recording medium in which a magnetic disk or a magneto-optical disk is housed in a cartridge.