JPH0329784Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a magnetic recording/reproducing device, and is particularly applicable to a magnetic tape cassette recording/reproducing device to which, for example, a special tape cassette for business use is applied. The present invention relates to means for preventing erroneous attachment (erroneous insertion) of a magnetic recording/reproducing apparatus, which prevents the attachment (insertion) of a type tape cassette.

(Prior Art) Generally, there are two types of video tape recorders (hereinafter referred to as VTRs): general home VTRs and commercial VTRs.
Since the requirements for high image quality and quality are more stringent than those for VTRs, the recording method is naturally different from that for home use.

For example, the recording method of this type of professional VTR is β
There are two methods called the Cam (registered trademark) method and the M format method. For example, when recording signals using a standard type tape cassette of the former method, the luminance signal and color signal are recorded at a predetermined azimuth angle. In this method, each track is recorded alternately through guard bands using a magnetic head having a magnetic head.

In addition, in the latter method called the M format method, when recording using a standard type tape cassette of the VTR (registered trademark) method, brightness signals and color signals are alternately recorded via a guard band. It is. Both of these types are VTRs for general home use.
This method is different from the method in which a luminance signal and a color signal are superimposed on each track, and guard bandless recording is performed using a magnetic head having a predetermined azimuth angle.

Therefore, for example, tape cassettes on which signals are recorded using the above two recording formats for business use are not suitable for general household use because their external shapes are the same.
It is easy to be mistaken for a tape cassette used in a VTR (hereinafter sometimes referred to as a standard VTR), and when it is installed in a standard VTR, the recording format and signal playback processing system are different, as mentioned above. Naturally, this results in various inconvenient situations, such as making it impossible to play back previously recorded signals and making the user think that the device (VTR) is broken and creating a sense of distrust.

In addition, as the image quality and quality have become higher, magnetic tape materials have changed from those whose main components are Fe ₂ O ₃ and CrO ₂ to tapes that use metal materials, and the former material is now being used. Ferrite heads are generally used for magnetic tape recording/reproducing heads, and tape recording/reproducing heads using the latter material are made of materials such as sendust and , an amorphous head, which has been in the spotlight in recent years, is used. Therefore, if a tape cassette that uses metal tape is attached to a standard VTR that uses a ferrite head for recording, the saturation magnetic flux density will be insufficient due to the composition of the ferrite head, and the signal will not be recorded properly. The problem arises that this is not possible.

Generally, this type of tape cassette consists of an upper half and a lower half that are divided into two halves, the lids of which are joined together with screws, etc., and the magnetic tape is wound inside the cassette. A supply reel and a take-up reel are rotatably housed at predetermined positions in the cassette body with predetermined spacing between them. And when recording/playing,
The opening/closing lid provided on one side of the case body is a VTR.
The cassette is opened by a lid opening mechanism, and the magnetic tape is pulled out from the cassette body by a magnetic tape pull-out means and brought into contact with a magnetic head.

Here, a standard tape cassette used in a conventional standard VTR will be explained. FIG. 6 is a perspective view of a conventional standard tape cassette.

In the figure, a tape cassette 1 rotatably houses (built-in) two tape reels (none of which are shown) wound with magnetic tape in a cassette housing 2.

The magnetic tape can be pulled out from the front surface of the cassette case 2, and an openable and closable cover 3 for protecting the magnetic tape is provided on the front surface of the cassette case 2.

The tape cassette 1 is usually placed in a cassette holder that has a cassette insertion slot on the outside of the VTR cabinet or a cassette holder inside the VTR that has a cassette insertion slot on the front of the VTR cabinet, with the lid 3 on the front of the tape cassette 1. is inserted first.

Figure 7 shows a standard type to which tape cassette 1 is applied.
The front view of the VTR cassette holder is shown, and the tape cassette 1 is not inserted into the cassette insertion slot 7 in the wrong direction (for example, with the lid 3 at the back or upside down). Equipped with means to prevent incorrect insertion. The figure shows, as an example, a front view of a cassette holder with a cassette insertion slot provided on the front of the VTR cabinet.

As shown in the figure, a guide groove 4 is provided at the center of the lower edge of the lid 3 of the tape cassette 1 to prevent incorrect insertion. The groove 5 is located on the same line as the groove 5 in the insertion direction of the cassette, and is formed so as to communicate with the groove 5.

On the other hand, below the tape insertion slot 7 inside the cassette holder 6 on the VTR side, a stopper 8 made of, for example, a rib-shaped member (protrusion) is provided at a position corresponding to the guide grooves 4 and 5 of the tape cassette 1. There is.

Therefore, insert tape cassette 1 in the correct direction.
When the tape cassette 1 is inserted into the cassette insertion slot 7 of the VTR, the stopper 8 of the cassette holder 6 and the guide grooves 4 and 5 of the tape cassette 1 align and engage with each other, allowing the tape cassette 1 to be inserted into the cassette holder 6. Permissible.

However, if you try to insert the tape cassette 1 upside down, the step 9 formed on the upper edge of the lid 3 of the cassette housing 2 will come into contact with the stopper 8, or if you try to insert the tape cassette 1 upside down. Even if you try to insert the cassette with
(there is no guide groove) comes into contact with the stopper 8, and insertion of the tape cassette 1 into the cassette holder 6 is prevented in either case.

(Problems to be solved by the invention) By the way, as mentioned above, in addition to standard VTRs for general home use, special purpose VTRs have recently appeared.

That is, for example, special VTRs called β-cam (registered trademark) system or M-format system used for commercial purposes such as news reports use tape cassettes for standard VTRs, but have a different recording system.
Furthermore, since the tape running speeds are different (because the standards are different), they are completely incompatible with standard VTRs.

In addition, in terms of the material of the magnetic tape,
When metal tape, vapor-deposited tape, etc. are used for high-density recording, the recording current and erasing current are different, so it cannot be said that they are compatible.

Therefore, there has been a strong desire for a means to prevent standard tape cassettes from being installed in such special purpose VCRs.

Note that the tape cassettes of these special VTRs also use standard cassettes for their cassette casings and tape protection cassettes, so even though they are special cassettes, their external dimensions and shape are almost standard. They are the same as those of the same type, and if they were differentiated by mere indications, it would cause confusion during use, and there was a risk of arousing distrust among users.

Therefore, the present invention has been developed to prevent incorrect insertion (misinsertion) in which even if a standard tape cassette is mistakenly attempted to be inserted (inserted) into the cassette insertion slot of a special VTR that uses the above-mentioned special tape cassette, the insertion (insertion) is prevented.
It is an object of the present invention to provide a magnetic recording/reproducing device which includes a prevention means to prevent a standard tape cassette from being attached to such a special VTR.

(Means for Solving the Problems) In order to achieve the above object, the present invention is provided with a cassette housing 20 having a cassette insertion space, and by moving the cassette housing 20, a tape cassette 11 containing a magnetic tape is inserted. In a magnetic recording and reproducing apparatus configured to be mounted at a predetermined recording or reproducing operation position, a protruding member 24 that protrudes into the cassette insertion space is provided in a part of the cassette housing 20, and the position of the protruding member 24 is adjusted. , there is provided a magnetic recording and reproducing apparatus characterized in that the magnetic recording and reproducing apparatus is set at a position that prevents a standard tape cassette from being attached to the cassette housing 20.

(Function) In the magnetic recording/reproducing apparatus having the above configuration, only a tape cassette having a notch 15 that engages with the protruding member 24 provided in the magnetic recording/reproducing apparatus (VTR) can be mounted (inserted). becomes.

As a result, the recording mode based on the signal recording method of the VTR always matches the signal recording mode on the magnetic tape housed in the tape cassette loaded (inserted) into the VTR.

(Embodiment) An embodiment of the magnetic recording/reproducing apparatus according to the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a tape cassette (special tape cassette) other than a standard tape cassette, which is a tape cassette applied to an embodiment of the magnetic recording/reproducing apparatus according to the present invention. Note that the following description is the same as that of the standard tape cassette (shown in Figure 6) except as otherwise specified.

In the figure, a lid 12 that can be opened and closed is provided on the front surface of the cassette housing 2 of the tape cassette 11, and a notch 15 having an inclined surface 14 is located approximately in the center of the upper surface 13 of the lid 12. is formed.

Note that guide grooves 4 and 5, which are present in the tape cassette 1, which is a standard tape cassette, are not formed in the center of the lower lid of the lid body 12.

FIG. 2 is a sectional view showing a main part of a cassette housing of a special VTR to which the above-mentioned special tape cassette is mounted.

In the figure, an operation panel 17 of a VTR cabinet 16 has a cassette insertion opening 18 for the tape cassette 11, and a cassette insertion space made of a cassette housing 20 is provided inside the cassette insertion opening 18.

The cassette housing 20 is a cassette holder 2
1 and a reinforcing plate 22 fixed at a predetermined interval above this cassette holder 21. In the illustrated position, it faces the cassette insertion opening 18 of the operation panel 17, but it is driven by a motor as shown by the arrow A--. It can be moved up and down in the B direction.

The reinforcing plate 22 has a square hole 23 approximately in the center thereof, and a stopper 24 is fitted into the square hole 23 so as to be able to move forward and backward and not rotate.

Figure 3 shows a side view of the stopper, and shows the stopper 2.
Reference numeral 4 is a molded product made of resin such as polyacetal, in which a slope 25, a vertical surface 26, and a shaft portion 27 are integrally molded. Note that the stopper 24 may be made of die-cast aluminum or the like.

Since the compression spring 28 is inserted into the shaft portion 27 of the stopper 24, and the shaft portion 27 is further inserted into the hole of the mounting plate 29, the stopper 24 is always biased in the projecting direction.

The cassette housing 20 is also provided with a rubber roller 30, which automatically loads the tape cassette 11 into the cassette housing 20 during a cassette loading operation to be described later.

The structure of the tape cassette and cassette housing applied to the magnetic recording/reproducing apparatus according to one embodiment of the present invention is as described above, and the operation thereof will be explained next.

As shown in FIG. 4, the tape cassette 11 is
When the cassette is inserted through the cassette insertion port 18 in the direction of arrow C, the slope 14 of the cutout 15 of the cassette comes into contact with the slope 25 of the stopper, and the stopper 24 is retracted in the direction A against the compression spring 28. As a result, the tape cassette 11 continues to be inserted in the direction of arrow C and eventually comes into contact with the rubber roller 30. At this time, the deviation of the rubber roller 30 is detected and the motor starts, and the deceleration mechanism and drive chain (both of which are not shown) are activated. Since the rubber roller 30 is rotated in the direction of arrow D through the tape cassette 11, the tape cassette 11 automatically reaches the position a (indicated by the two-dot chain line) in FIG.

When the tape cassette 11 reaches position a, another detection means is activated, and the same motor lowers the cassette housing 20 in the direction of arrow B. When the tape cassette 11 reaches position b in FIG. stops, and the tape cassette 11 and cassette housing 20 are held at this position b.

In this position, the lid 12 of the tape cassette 11 is opened upward by about 90 degrees, and after the magnetic tape is pulled out from the tape cassette 11, a predetermined recording or reproducing operation is performed.

Next, FIG. 5 shows the case where a standard type tape cassette is inserted into the cassette housing of a special VTR. Tape cassette 1 (shown in FIG. 6), which is a standard type tape cassette, is inserted into the cassette insertion slot 18 of this special VTR through the arrow C. When the cassette is inserted in this direction, the step 9 formed on the lid 3 of the cassette comes into contact with the vertical surface 26 of the stopper 24, so that further insertion of the cassette is prevented.

Note that even if this tape cassette 1 is inserted with the front and back sides reversed, the guide grooves 4 and 5 of the lid body 3 will not touch the stopper 24.
Insertion is prevented because the tape cassette 11 is narrower, and even if the tape cassette 11 is inserted in the reverse direction, the rear surface 10 of the cassette abuts against the stopper 24, so insertion is similarly prevented.

On the other hand, even when the special tape cassette 11 is inserted into the cassette insertion slot 18 with the front and back reversed, since no guide groove or notch is formed on the lower edge of the lid 12 of the cassette, the stopper 24 will still be inserted. Abuts to prevent further insertion of the tape cassette.

Furthermore, even if you try to insert the tape cassette 11 into the cassette insertion slot 4 (see Fig. 7) of a standard VTR, there is no guide groove or notch on the lower edge of the lid 12 of the tape cassette 11, so the stopper 8 will not fit. Therefore, insertion is prevented.

Furthermore, even if you try to insert the tape cassette 11 upside down into the cassette insertion slot 6 of a conventional standard VTR, the height of the notch 15 on the top surface 13 of the lid 12 is lower than the height of the stopper 8. Therefore (or because the stopper 8 comes into contact with the inclined surface 14), insertion beyond the stopper 8 is prevented.
Even if an attempt is made to insert the tape cassette 11 in the reverse direction, the rear surface 10 of the cassette housing 2 comes into contact with the stopper 8 and insertion is prevented.

As described above, the magnetic recording/reproducing apparatus (VTR) according to one embodiment of the present invention has the same external shape as a standard tape cassette, but has a recording method different from that of the standard tape cassette. If the tape cassette (special tape cassette) used for
If an attempt is made to install (insert) this tape cassette upside down or front to back, such incorrect installation (misinsertion) can be reliably prevented, and the user will feel distrustful. There will be no more hugging.

In addition, a standard tape cassette for general household use can be attached (inserted) to this magnetic recording/reproducing device (VTR).
When an attempt is made to do so, the loading (insertion) is blocked regardless of the insertion direction of the cassette, and incorrect loading (erroneous insertion) is prevented. In other words, it is possible to not only prevent incorrect loading (erroneous insertion) of different types of tape cassettes into this VTR, but also to prevent the wrong loading (erroneous insertion) of tape cassettes of the same type in the wrong loading (insertion) direction. .

In addition, the position where the stopper 24 is provided is as follows.
Attached (inserted) to the VTR cassette housing 20
Notch 15 formed in the special tape cassette
It may be located anywhere within the cassette housing 20 as long as it corresponds to the direction of insertion of the tape cassette. In particular, it may be located at any position so long as it protrudes in a direction substantially perpendicular to the insertion direction of the tape cassette.

(Effects of the Invention) As described above, the magnetic recording and reproducing apparatus of the present invention includes a detection member that protrudes into the cassette insertion space in a part of the cassette housing. Since the standard tape cassette is set in a position that prevents installation into the cassette housing, only tape cassettes provided with a notch that engages with this protruding member can be installed, and the execution (reproduction operation) of this magnetic recording/reproduction device is prevented. etc)
It has the advantage of being able to prevent a tape cassette containing a magnetic tape on which signals have been recorded in a manner different from the recording manner based on the signal recording method described above from being erroneously inserted into the recording/reproducing apparatus.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a tape cassette other than a standard tape cassette, which is a tape cassette applied to an embodiment of the magnetic recording and reproducing apparatus according to the present invention, and FIG. 3 is a side view of the stopper, and FIG. 4 is a sectional view of the cassette housing of an embodiment of the magnetic recording/reproducing device (special VTR) according to the present invention, which is applied to this special VTR. Figure 5 is a cross-sectional view when a standard tape cassette is installed (inserted) in an embodiment of the magnetic recording/reproducing device (special VTR) of the present invention; FIG. 6 is a perspective view showing a standard tape cassette, and FIG. 7 is a front view of a cassette holder of a standard VTR to which the standard tape cassette is applied. 2...Cassette housing, 11...Tape cassette, 12...Lid body, 13...Top surface of lid body 12, 1
4... Inclined surface, 15... Notch, 16... VTR
Cabinet, 18...Cassette insertion slot, 20...
...Cassette housing, 21...Cassette holder, 24...Stopper.

Claims (1)

[Claims for Utility Model Registration] (1) A cassette housing having a cassette insertion space is provided, and the cassette housing is moved to mount a tape cassette containing a magnetic tape at a predetermined recording or playback operation position. In the magnetic recording/reproducing device, a protruding member protruding into the cassette insertion space is provided in a part of the cassette housing, and
A magnetic recording and reproducing apparatus characterized in that the protruding member is positioned at a position that prevents a standard tape cassette from being attached to the cassette housing. (2) The projecting member is a stopper provided on the top surface of the cassette housing that can move forward and backward, and the stopper is biased by a spring so as to project in a direction substantially perpendicular to the direction in which the tape cassette enters. A magnetic recording and reproducing device according to claim 1 of the patent registration claim.