JPH026545Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a state detection mechanism such as a mechanism for preventing accidental erasure of a novel recording/reproducing medium device. Specifically, regarding the state detection mechanism such as the accidental erasure prevention mechanism of recording and reproducing media devices such as audio or video tape cassettes and magnetic disk cassettes, a sliding body is slidably mounted in a recess provided in the case body. A recordable state and a recordable state can be easily brought out by this, and the sliding body is initially formed integrally with the case body to prevent accidents such as loss. A state detection mechanism such as a mechanism to prevent accidental erasure of a new recording/reproducing media device is developed to prevent damage to the sliding body when it is separated from the case body by devising the connecting structure of the sliding body to the case body. This is what we are trying to provide. Note that state detection mechanisms other than the accidental erasure prevention mechanism include, for example, the type of recording medium (for example, metal and normal), the recording state (for example, noise reduction on and off, video signal field recording and frame recording), etc. It includes a mechanism for

BACKGROUND TECHNOLOGY AND PROBLEMS Tape cassettes and magnetic disk cassettes containing magnetic tapes and magnetic disks are usually provided with an erroneous erasure prevention mechanism to prevent recorded signals from being erroneously erased.

What is shown in FIG. 1 is an example of an accidental erasure prevention mechanism provided in a conventional audio compact cassette. Reference numeral a designates a cassette, and a recess b is formed on the back surface of the cassette, and an erroneous erasure prevention claw c is formed through a thin wall portion d to cover the recess b.
When such a cassette is installed in the tape recorder main body, the detection pin e corresponding to the recess b
comes protruding from the tape recorder body side. When the accidental erasure prevention claw c of the cassette a is not removed, the detection pin e abuts against the accidental erasure prevention claw c and cannot enter into the recess b, as shown by the solid line in Fig. 1. It is detected that the recording is possible. If you do not want to erase the recorded signal, break off the accidental erasure prevention claw c from the thin part d. Then, the detection pin e is able to enter the recess b as shown by the two-dot chain line in FIG. 1, and it is detected that recording is not possible. The operations performed are not recorded, thus preventing erasure of the signals recorded on the tape.

However, with such an accidental erasure prevention mechanism, if the signal recorded on the tape becomes unnecessary and you wish to record another signal, you must close the recess b of cassette a using adhesive tape or the like. Of course, it's annoying.

Therefore, the applicant previously proposed a magnetic disk cassette g equipped with an erroneous erasure prevention mechanism f as shown in FIG. This is a cassette housing h in which a magnetic disk i is rotatably housed, and its erroneous erasure prevention mechanism f is constructed as follows.

That is, a rectangular recess j is formed in the cassette casing h, and an erroneous erasure prevention claw k is connected to one longitudinal end of the recess j via a thin wall l (see Fig. 2A). reference). When the magnetic disk cassette g is attached to the disk recorder main body in this state, the detection pin of the disk recorder main body collides with the accidental erasure prevention claw k and is prevented from entering the recess j, leaving it in a recordable state. Something is detected. and,
To prevent erroneous erasure, separate the erroneous erasure prevention claw k from the cassette housing h at the thin-walled portion l, turn it 90 degrees from the state shown in Figure 2A, and insert it into the recess as shown in Figure 2C. Attach to j so that it can slide freely. and,
When the erroneous erasure prevention claw k is in the position shown by the solid line in FIG. 2C, the detection pin of the disc recorder main body can enter into the recess j, and it is detected that recording is impossible. When recording again on the magnetic disk i, slide the accidental erasure prevention claw k to the position shown by the two-dot chain line in FIG. 2C.
The detection pin of the disc recorder body collides with the accidental erasure prevention claw k and cannot enter into the recess j.
Recording becomes impossible.

As described above, in the accidental erasure prevention mechanism f applied to the magnetic disk cassette g shown in FIG. This can be done simply by sliding the erroneous erasure prevention claw k and changing its position, making the selection operation extremely easy and simple.

However, in the accidental erasing prevention mechanism shown in FIG.
Since it is connected to the cassette casing h at the end of m', when the erroneous erasure prevention claw k is separated from the cassette casing h, stress is applied to bend it in the longitudinal direction of the erroneous erasure prevention claw k, thereby preventing erroneous erasure. There is a risk that the claw k may break. In addition, the engagement protrusion m of the accidental erasure prevention claw k,
m' is slidably engaged with sliding grooves n and n' formed on both sides of a recess j formed in the cassette casing h.
When the engaging protrusion m' is folded away, a burr is formed on the end face of the engaging protrusion m', and this burr may obstruct the smooth sliding of the erroneous erasure prevention pawl k in the recess j.

Purpose of the invention Therefore, the present invention makes it possible to easily select one of two different states, such as a recordable state and a recordable state, by slidably mounting a sliding body in a recess provided in a case body. In addition, the sliding body should be formed integrally with the case body to prevent accidents such as loss, and the structure for connecting the sliding body to the case body should be devised. It is an object of the present invention to provide a novel state detection mechanism for a recording/reproducing medium device that prevents damage to the sliding body when it is separated from the case body.

Summary of the invention The state detection mechanism of the recording/reproducing media device of the invention is as follows:
In order to achieve the above object, a rectangular recess is formed in the case body housing the recording medium, and a connecting part is formed between the long side of the opening edge of the recess and the side substantially perpendicular to the sliding direction of the sliding body. a first position indicating a first state of the recording medium, etc., and a second state of the recording medium, etc. in the recessed part; The device is characterized in that it can be mounted so as to be slidable between the second position and the second position.

Embodiments The details of the state detection mechanism of the recording and reproducing medium device of the present invention will be described below with reference to illustrated embodiments.

3 to 11 show an example of the state detection mechanism of the recording/reproducing medium device of the present invention, in which the present invention is applied as a mechanism for preventing erroneous erasure of a magnetic disk cassette.

Reference numeral 1 designates a magnetic disk cassette in which a magnetic disk 3 is rotatably housed in a cassette housing 2 made of synthetic resin such as ABS resin.

The cassette housing 2 consists of an upper half 4 and a lower half 5, and the halves 4 and 5 are partially joined and integrated by ultrasonic welding with the magnetic disk 3 housed between them. .

Shallow circular recesses 6, 7 are formed in the upper half 4 and lower half 5, and these recesses 6, 7 are formed when the two halves 4, 5 are integrated by ultrasonic welding.
7 forms a space in which the magnetic disk 3 is accommodated. Several protrusions 8, 8, . . . and 9, 9, . . . are formed along the edges of the recesses 6, 7 of the upper half 4 and lower half 5, respectively. When integrated, these protrusions 8,
8, . . . and 9, 9, . is maintained at a predetermined value. Therefore, the protrusions 8, 8, . . . and the ridges 9, 9, . . . are shifted in position so that they do not abut each other.

10 ₁ , 10 ₂ , 10 ₃ and 10 ₄ are positioning protrusions integrally formed on the upper half ₄ ;
11 ₂ , 11 ₃ and 11 ₄ are positioning projections integrally formed on the lower half 5. And these positioning protrusions 10, 10, ... and 11, 11, ...
When the upper half 4 and the lower half 5 are integrated, 11 ₁ is within 10 ₁ , 11 ₂ is within 10 ₂ , and 10 ₃
are fitted into 11 ₃ and 10 ₄ into 11 ₄ , respectively, so that the relative positional relationship between the upper half 4 and the lower half 5 is maintained correctly.

The upper half 4 and the lower half 5 are formed with protrusions 12 and 13 that go around their respective peripheral edges, and when the upper half 4 and the lower half 5 are integrally connected,
The protrusions 12 and 13 are butted against each other to constitute the outer circumferential wall of the cassette housing 2.
Also, ribs 14, 14, .
is formed, and during ultrasonic welding, this rib 1
4, 14, . . . and the portions of the protrusion 12 in contact with these are melted, and therefore the protrusions 12 and 13 are welded together at the locations where these ribs 14, 14, .

A substantially L-shaped protrusion 15 is provided at one corner of the lower half 5.
is formed, and a rectangular hole 16 whose width is slightly smaller than that of the space is formed in a rectangular space surrounded by this L-shaped protrusion 15 and the protrusion 13. There is. By making the width of the hole 16 slightly smaller than the width of the space, engaging edges 17, 17 along the length of the hole 16 are formed on both sides of the hole 16. 18 and 18' are small projections formed on the inner surface of the peripheral protrusion 13 facing toward the hole 16;
Reference numeral 9 denotes a notch formed in the engaging edge 17 on the side where the small protrusions 18, 18' are formed, and is formed on the outside (lower side in the drawing) of the position where the small protrusions 18' are formed. The upper half 4 is also formed with an L-shaped protrusion 20, and this L-shaped protrusion 20 corresponds to the L-shaped protrusion 15 of the lower half 5. Therefore, the upper half 4 and the lower half When half 5 is superimposed,
The L-shaped protrusions 15 and 20 are brought into contact with each other.

As described above, when the upper half 4 and the lower half 5 are joined and integrated by ultrasonic welding, a recess opened by the rectangular hole 16 is formed at the corner of the back side of the cassette housing 2. Therefore, the four sides of the recess are surrounded by the protrusions 12, 13, 15, and 20. Then, the lower half 5 is placed in the recess.
Sliding grooves 21, 21 are formed between the engaging edges 17, 17 corresponding to the side edges of the hole 16 and the inner surface of the upper half 4.

Reference numeral 22 denotes a slider, which includes a main body part 23 having a rectangular planar shape and elastic locking pieces 24, 2 integrally formed in an upright manner from the short side end of this main body part 23.
4', it is formed into a substantially U-shape. The length l of the long side of the main body 23 is the length l of the long side of the cassette housing 2.
It is formed to have a width approximately equal to or slightly larger than the width w of the hole 16 formed on the back surface.

Further, at the distal ends of the elastic locking pieces 24, 24' of the slider 22, engaging protrusions 25, 25' protrude outward.
are integrally formed. And the engaging protrusion 2
The outer surfaces of the tips 5 and 25' are inclined surfaces 26 and 26'. Reference numeral 27 denotes a small projection formed on the end surface of one of the engaging protrusions 25, and 28, 28, .

Therefore, such a slider 22 is attached to the main body 23.
One of the long sides is a hole 16 formed in the cassette housing 2.
and one long side of the hole 16 of the cassette housing 2 are integrally connected via the thin wall portion 29, and the hole 1
6 in the longitudinal direction. The detection pin 30 provided in the magnetic disk cassette recording/reproducing device corresponds to the upper half in the drawing of the hole 16 formed on the back surface of the cassette case 2 when the magnetic disk cassette 1 is installed in the device. Therefore, when the slider 22 is attached to the recording/reproducing apparatus while connected to the cassette case 2 as described above, the detection pin 30 of the recording/reproducing apparatus will impact against the slider 22. As a result, it is detected that the recording is possible.

If you do not want to erase the signals recorded on the magnetic disk 3, as shown in FIG. , when it is slightly gouged to the side as shown by arrow A, the thin part 29 is cut,
The slider 22 is separated from the cassette housing 2. Then, rotate the direction of the separated slider 22 by 90 degrees,
Align the small protrusion 27 formed on the end surface of the engagement protrusion 25 with the notch 19 formed on the edge of the hole 16, and
An inclined surface 26 on the outer surface of the tip of the engagement protrusion 25, 25';
26' is applied to the edge of the hole 16, and when the slider 22 is pushed in in this state, the elastic locking pieces 24, 24' are slightly bent inward, and the engaging protrusions 25, 25' are pressed against the edge of the hole 16.
beyond the engaging edges 17, 17 of 6 and into the recess;
Moreover, it is slidably engaged with the sliding grooves 21, 21 formed between the engaging edges 17, 17 and the inner surface of the upper half 4 (see FIGS. 9, 10, and 11). .
In this state shown in FIG. 9, the engaging protrusion 25 of the slider 22
The small protrusion 27 formed on the end face of the lower half 5 is located approximately on the outside (lower side in the figure) than the small protrusion 18' formed on the peripheral protrusion 13 of the lower half 5, so that the slider 22 will move upward in the figure. Then, the small protrusion 27
hits the small protrusion 18' and becomes a stopper. In this state, insert magnetic disk cassette 1.
When the recording/reproducing apparatus is attached, the detection pin 30 can enter the recess through the hole 16, and therefore, it is detected that recording is not possible.

If you want to make a magnetic disk cassette recordable once it has been rendered unrecordable,
Slide the slider 22 upward in FIG.
Make the state shown by the two-dot chain line. In the process of sliding the slider 22 upward, the small protrusion 27 of the slider 22 moves from the small protrusion 1 formed in one of the sliding grooves 21.
8' and is prevented from sliding upward. However, if you push it upward a little forcefully, the slider 2
By bending the elastic locking piece 24 of No. 2, the small protrusion 27 climbs over the small protrusion 18', and furthermore, the small protrusion 1
8 and move to the position shown by the two-dot chain line in FIG. The reinforcing ribs 28, 28, . Moko 2
The small protrusion 27 of No. 2 can easily fit on the small protrusion 18 or 18'. Further, the length l of the long side of the main body 23 of the slider 22 may be made slightly larger than the width w of the hole 16, or the engagement protrusion 2
The length L to the outer end surface of 5' is from sliding groove 21 to 21.
If the width W is made slightly larger than the width W of the slider 22, or if the width W is made slightly larger than the width W of the slider 22, the main body portion 23 will flex slightly, and the elastic force generated thereby will cause the engagement protrusions 25, 25' of the slider 22 and the sliding groove 21, 21, thereby keeping the slider 22 in its current position and pushing the small protrusions 18, 1
8' and 27 can be omitted. Slider 2
2 is in the position shown by the two-dot chain line in FIG. 9, the detection pin 30 of the recording/reproducing device collides with the slider 22 and cannot enter the recess, indicating that recording is possible. Detected. In this manner, the slider 22 moves inside the recess formed in the cassette housing 2 and opened by the hole 16 into a first position where recording is permitted on the recording medium and a second position where the recording is prohibited. Since it is made to be able to slide freely between the two, it is possible to set the recordable state or the recordable state with a simple operation.

In addition, 31 is a window formed in the upper half 4, and
32 is a window formed in the lower half 5, and both windows 3
1 and 32 correspond in position. These windows 31 and 32 are provided so that the recording head or the reproducing head of the recording/reproducing apparatus can come into contact with the magnetic disk 3 housed within the cassette housing 2. A shutter 33 is formed by bending a thin metal plate into a U-shape, and has windows 34 and 35 of approximately the same size as the windows 31 and 32 of the cassette housing 2 on both upper and lower surfaces.
The shutter 33 is mounted on the cassette casing 2 so that it can slide within a recess 36 formed in the cassette casing 2. When the shutter 33 is in the state shown in FIG.
32 and the windows 34 and 35 of the shutter 33, and the cassette case 2 is exposed to the outside and becomes ready for recording or playback.When the cassette case 2 is slid to the right from the state shown in FIG. Windows 31 and 32 will be closed. Therefore,
When in use, the shutter 33 is preferably in the state shown in FIG. 4, and when not in use, the shutter 33 is preferably slid to the right from the state shown in FIG.

Effects of the Invention As is clear from the above description, in the state detection mechanism of the recording/reproducing medium device of the present invention, a rectangular recess is formed in the case body housing the recording medium, and the opening edge of the recess is The long side and the side substantially perpendicular to the sliding direction of the sliding body are connected at a connecting part to form an integral body, the sliding body is separated from the case body at the connecting part, and a recording medium, etc. is placed in the recessed part. The device is characterized in that it can be mounted so as to be slidable between a first position indicating a first state of the recording medium, etc. and a second position indicating a second state of the recording medium, etc. By slidably attaching the slider to a recess provided in the case body, one of two different states, such as a recordable state and a recordable state, can be easily selected and displayed. In addition, the sliding body is initially formed integrally with the case body to prevent accidents such as loss, and damage to the sliding body when separated from the case body can be prevented. There are many advantages such as preventing dimensional errors from occurring due to burrs etc. in the sliding part between the sliding body and the recess formed in the case body, and also allowing the sliding body to have appropriate elasticity. produces the effect of

The present invention is not limited to magnetic disk cassettes, but can be applied to various recording and reproducing media devices in which a recording medium is housed in a housing, such as audio tape cassettes and video tape cassettes.

In addition, the present invention is not limited to an erroneous erasure prevention mechanism, but can also be applied to other state detection mechanisms, such as a mechanism for determining the type of recording medium, recording state, etc.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an accidental erasure prevention mechanism provided in a conventional audio tape cassette, and FIG. 2 shows a magnetic disk cassette equipped with an accidental erasure prevention mechanism previously proposed by the applicant. B is a perspective view of the main part, C is an enlarged rear view of the main part,
3 to 11 show an example of the implementation of the state detection mechanism of the recording/reproducing medium device of the present invention, FIG. 3A is an exploded perspective view of the whole, FIG. 3B is an enlarged view of the main part of FIG. Figure 3C is an inner perspective view of the upper half, Figure 4 is an overall perspective view, Figure 5 is an enlarged rear view of the main parts, and Figure 6 is an enlarged rear view of the main parts.
The figures are a sectional view taken along the line A-A in Fig. 5, Fig. 7 is a perspective view showing the middle of the operation of separating the slider from the case body, Fig. 8 is a perspective view of the slider, and Fig. 9 10 is an enlarged rear view of the main part in a state where the slider is slidably engaged with the recess, FIG. 10 is a sectional view taken along line B-B in FIG. 9, and FIG. 11 is C-C in FIG. 9. It is a sectional view along a line. Explanation of symbols, 1... Recording/reproducing media device, 2...
... Case body, 3 ... Recording medium, 16 ... Opening of recess, 22 ... Sliding body.

Claims (1)

[Scope of utility model registration request] A rectangular recess is formed in the case body housing the recording medium, and the long side of the opening edge of the recess and the side substantially perpendicular to the sliding direction of the sliding body are connected by a connecting part to form an integral unit. The sliding body is separated from the case body at the connecting portion, and the recess has a first position in which the recording medium or the like is in a first state and a second position in which the recording medium or the like is in a second state. 1. A state detection mechanism for a recording/reproducing media device, characterized in that it can be mounted so as to be slidable between the media.