JPS6141191Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanism for preventing erroneous erasure in recording and reproducing devices such as tape cassettes and disk cassettes.

Tape cassettes and disk cassettes that house magnetic tapes and magnetic disks are usually provided with an erroneous erasure prevention mechanism to prevent recorded signals from being erroneously erased.

For example, as shown in FIG. 1, a conventional audio compact cassette has a predetermined position
For example, a recess 2 is formed on the back surface of the cassette 1, and a so-called erroneous erasure prevention claw 3 is integrally provided to close the recess 2. On the other hand, on the tape recorder main body side, there is a recess 2 of the installed cassette 1.
A detection body 4 is provided at a position corresponding to , and is configured so that this detection body 4 can enter into the recess 2 .

In the initial state, for example, in an unused tape cassette, the recess 2 is closed by the erroneous erasure prevention claw 3, as shown by the solid line in FIG. Therefore, in this state, the detection object 4 cannot enter into the recess 2. At this time, the tape recorder main body is in a recordable state and can record on the magnetic tape in the tape cassette 1.

On the other hand, if it is desired to prevent the recorded signal from being erased by mistake, the user breaks off the erroneous erasure prevention claw 3 of the tape cassette to open the recess 2. When the tape cassette 1 with the accidental erasure prevention claw 3 broken off in this way is mounted on the tape recorder main body, the recess 2 is open, so that the detection object 4 enters into the recess 2, and as a result, the tape recorder body becomes unable to record. Therefore, even if the user accidentally operates the record button on the tape recorder main body, recording will not occur and therefore the signal recorded on the tape will not be erased.

As described above, in the accidental erasure prevention mechanism adopted in the conventional audio compact cassette, the presence or absence of the accidental erasure prevention claw 3 on the tape cassette 1 is detected by the detection body 4 on the tape recorder body side, Based on this, the recording operation of the tape recorder is controlled. However, with such a configuration in which the accidental erasure prevention claw 3 is broken off from the cassette 1, if it becomes necessary to record again on the cassette 1 from which the accidental erasure prevention claw 3 has been broken off, it is necessary to use adhesive tape, etc., for example. It was troublesome that the recess 2 had to be closed using a separate member.

On the other hand, as a mechanism for preventing mistaken erasure that can be used repeatedly, there are known mechanisms in which the recess 2 is closed with a removable closing member, or in which the recess 2 is opened and closed with a shutter-like opening/closing lid. . However, the former method has the disadvantage that the removed closing member is easily lost and the closing member must be manufactured as a separate component, resulting in high cost.On the other hand, the latter method has the disadvantage that its structure is complicated. The drawback was that it was expensive.

Therefore, the present applicant has already proposed an accidental erasure prevention mechanism that solves the above problem in Utility Application No. 180506/1983. In the accidental erasure prevention mechanism related to this application,
The object to be detected is integrally provided in a recess provided in a housing such as a cassette, and after the object is broken off from the cassette, the orientation of the object is changed and the object is installed in the recess. It is configured to be slidable within the recess, and by detecting the position of the object to be detected, erroneous erasure is prevented. in this way,
Since the broken-off object to be detected is mounted in the recess, there is no risk of the object being lost, and its structure and manufacture are very simple.

However, this erroneous erasure prevention mechanism has a problem in that it is relatively difficult to break off the detected object. In other words, such a detected object is relatively small, and when it is broken off and separated from the casing, the joint between the detected object and the casing forms a hinge, making it difficult to break. If force is applied, there is a risk that the object to be detected itself may be damaged.

The present invention has been developed in view of these problems, and aims to provide a mechanism for preventing accidental erasure, which retains the features of Utility Application No. 18506/1982 and also makes it easier to break off the object to be detected. It is something.

An embodiment in which the present invention is applied to a disk cassette will be described below with reference to FIGS. 2 to 9.

As shown in FIG. 2, the disk cassette 7 is
Cassette housing 8 made of synthetic resin such as ABS resin
A magnetic disk 9 is housed within this cassette housing 8. An accidental erasure prevention mechanism 10 is provided at a predetermined position on the cassette housing 8 on the back side of the disk cassette 7, that is, on the side that comes into contact with the disk recorder body when the disk cassette 7 is attached to the disk recorder body. ing.

As shown in FIGS. 3 and 4, the cassette housing 8 is composed of an upper half 11 and a lower half 12. As shown in FIGS. As the erroneous erasure prevention mechanism 10, a recess 13 is formed at a predetermined position of the cassette housing 8, and a detected object 14 is disposed within this recess 13. The recess 13 has a rectangular opening on the side of the lower half 12, and sliding grooves 15 are provided on both sides along the long sides thereof. Furthermore, step portions 16 and 17 are provided on the short sides of the recess 11, respectively. On the other hand, the detected object 14 has a substantially U-shaped cross section, and includes a main body 18 having a rectangular plane and elastic locking parts 19 and 20 provided at both ends of the short side of the main body 18, respectively. ing. Further, the length l of the long side of the main body portion 18 is configured to be approximately equal to the length w of the short side of the recess 13.

The detected object 14 is integrally connected to the stepped portion 17 of the recess 13 via a connecting portion 29 at one of the elastic locking portions 20 . This connecting part 2
9 is provided with a substantially V-shaped notch groove 21 on its outer surface, and furthermore, substantially V-shaped notches 30 are provided on both sides of the connecting portion 29, respectively. Further, as clearly shown in FIG. 6, a substantially triangular reinforcing rib 31 is integrally provided between the main body portion 18 of the detected object 14 and the elastic locking portion 20.

In the installation state shown in FIGS. 3 and 4, the detection object 22 on the disc recorder main body side is connected to the detection object 1.
This detected object 1 is placed at a position where it comes into contact with the main body 18 of 4.
4 is provided. That is, when this disk cassette 7 is attached to the disk recorder main body,
The detection object 22 of the disk recorder main body is the detection object 1.
4 and cannot enter into the recess 13. Therefore, at this time, the disk recorder main body is in a recordable state and can record on the magnetic disk 9.

On the other hand, if it is desired to prevent the signals recorded on the magnetic disk 9 from being erased by mistake, the detected object 14 is broken off at the connecting portion 29 as in the case of the conventional erroneous erasure prevention claw. At this time, in this example, the notch groove 21 is provided on the outer surface of the connecting portion 29, and V-shaped notches 30 are provided on both sides of the connecting portion 29, so that as shown in FIG. As shown in FIG. 2, the detected object 14 is first rotated slightly outward about the connecting portion 29, and then a force F is applied to the side of the detected object 14.
By adding this, the detected object 14 can be easily separated at the connecting portion 29. Further, a reinforcing rib 3 is provided between the main body portion 18 of the detected object 14 and the elastic locking portion 20.
1 is provided, so during this separation, the detected object 1
4 itself is not likely to be broken or damaged, for example, between the main body part 18 and the elastic locking part 20.

As shown in FIGS. 7 to 9, the broken off detection object 14 is rotated around an axis perpendicular to its main body 18.
It is rotated 90 degrees and in this state is pushed into the recess 13 and installed. As clearly shown in FIG. 8, in this example, the opening of the recess 13 and the detected object 14 are
The elastic locking portions 19 and 20 are provided with tapered surfaces 23 and 24, respectively. Therefore, these tapered surfaces 2
3 and 24, the detected object 14 can be moved into the recess 1 by simply pushing the detected object 14 into the recess 13.
3 can be easily fitted. As shown in FIG. 8, the attached detected object 14 has an engaging surface 25 provided on the elastic locking portions 19 and 20 that engages with an engaged surface 26 provided on the sliding groove 15. This prevents the slider from coming off, and as a result, the steps 16 and 17 are removed along the sliding groove 15, as shown in FIGS.
It is slidably held between the

If it is desired to prevent the signals recorded on the magnetic disk 9 from being erased by mistake, the detected object 14 is moved to the positions shown by solid lines in FIGS. 7 and 9, respectively. When the disk cassette 7 in this state is attached to the disk recorder main body, the detection body 22 enters into the recess 13, as shown in FIG. Therefore, at this time, the disk recorder body is in a state where it cannot record, and even if, for example, the user accidentally operates the record button on the recorder body, the signal recorded on the magnetic disk 9 may be erased. can be prevented.

On the other hand, if it is desired to record again using this disk cassette 7, the detected object 14 can be slid to the position shown by the chain line in FIGS. 7 and 9, respectively. In the disk cassette 7 in this state, the detection object 22 of the disk recorder main body comes into contact with the main body part 18 of the detected object 14 and cannot enter the recess 13, similar to the state shown in FIGS. 3 and 4. Therefore, the disc recorder body becomes ready for recording.

Note that the elastic locking portion 19 of the detected object 14 is provided with a protrusion 32 at the tip of the engagement surface 25, and this protrusion 32 is connected to a pair of protrusions 33 provided in the sliding groove 15 on one side. By being elastically locked to the respective positions, the detected object 14 is click-stopped at the respective positions. 34 is a recess provided for the purpose of indicating on which side of the sliding groove 15 the protrusion 32 is provided and for facilitating insertion of the protrusion 32 of the detected object 14.

As described above, in this example, after the detected object 14 is broken off and fitted into the recess 13, the detected object 14 is moved between the position shown by the solid line and the position shown by the chain line in FIGS. 7 and 9. By sliding the body 14, the disk cassette 7 can be used for recording any number of times. In addition, steps 16 and 17 are provided on the short sides of the recess 13, respectively.
Since a gap is formed between the detected object 14 and the opening of the recess 13 by these stepped portions 16 and 17, it is easy to insert the fingertip into this gap and easily remove the detected object. 14 can be operated by sliding.

Although one example in which the present invention is applied to an accidental erasure prevention mechanism of a disk cassette has been described above, the above-mentioned example does not limit the present invention in any way, and various modifications can be made based on the technical idea of the present invention. It is.

For example, when sliding the object 14 to be detected, it is possible to display whether recording is possible or not. For this purpose, for example, the bottom surface 35 of the recess 13 may be divided into two colors, and only one of the colors may be exposed to the outside as the detected object 14 moves. This display can be made by letters, symbols, etc., and may also be provided on the upper surface of the cassette housing 8 (the outer surface of the lower half 12). The recess 34 may also be utilized for this purpose.

Furthermore, this invention can be used in addition to disk cassettes.
For example, the present invention can be applied to accidental erasure prevention mechanisms for various recording and reproducing devices in which recording media are housed in housings, such as audio tape cassettes and video tape cassettes. In addition, optical detection can also be used as a method for detecting the detected object 14. For example, the bottom surface of the recess 13 is made of a transparent material, and the light passing through the transparent material is blocked by the detected object 14. The detection object 14 may also be detected.

As explained above, in the accidental erasure prevention mechanism according to the present invention, a recess having an engaged portion is provided in a housing housing a recording medium, and a position within the recess that enables a recording operation of a recording/reproducing device is provided. To,
A detected object having an elastic engagement portion is provided integrally with the housing via a connecting portion, and a notch is provided in at least one side of the connecting portion. Therefore, the object to be detected can be broken off very easily, and there is almost no risk of damaging the object itself.

Furthermore, since the broken object to be detected is configured to be able to slide within the recess between a position that enables the recording operation of the recording/reproducing device and a position that restricts this, it is possible to slide the detected object into the recess. The recording and reproducing device can be used repeatedly for recording. Moreover, there is no need to use a separate member such as an adhesive tape, unlike conventional accidental erasure prevention claws. In addition, since the object to be detected is integrally molded with the housing, the manufacturing cost can be as low as that of a conventional erroneous erasure prevention claw. Furthermore, since the separated object to be detected is always held within the recess, there is no fear that the object to be detected will be lost.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a cassette showing a conventional erroneous erasure prevention claw. Fig. 2 is a bottom view of a disk cassette to which the present invention is applied, Fig. 3 is an enlarged plan view of the same accidental erasure prevention mechanism as above, and Fig. 4 is the same as Fig. 3.
A line sectional view, FIG. 5 is a partial perspective view showing how the object to be detected is broken off, FIG. 6 is a perspective view of the object to be detected, and FIG.
The figure is an enlarged plan view similar to Fig. 3 showing the broken-off detection object attached to the recess, and Fig. 8 is the same enlarged plan view as Fig. 7.
FIG. 9 is a sectional view taken along the - line in FIG. 7. In addition, in the symbols used in the drawings, 8...cassette housing, 10...miserasure prevention mechanism, 13...recess, 14...detected object, 19, 20...elastic locking part, 29...connecting part , 30...notch.

Claims (1)

[Scope of utility model registration request] Erroneous erasure of a recording/reproducing device that is installed in a housing housing a recording medium and is configured to be detected by a detection means provided on the main body side of the recording/reproducing device to control the recording operation of the recording/reproducing device. In the prevention mechanism, a recessed portion having an engaged portion provided in the housing, and a connecting portion provided integrally with the housing at a position within the recessed portion that enables recording operation of the recording/reproducing device. and a detection object having an elastic engagement part and a notch provided in at least one side of the connection part, the detection object and the casing being separated from each other at the connection part. By engaging the elastic engagement portion of the detected object with the engaged portion of the recess, the detected object is moved between a position where the recording operation of the recording/reproducing device is enabled and a position where this is restricted. An accidental erasure prevention mechanism for a recording/reproducing device, characterized in that the mechanism is configured to be able to slide within the recess.