JPH0896553A - Detection hole opening/closing mechanism of cassette - Google Patents

Abstract

PURPOSE: To improve the operability of opening and closing a detection hole by sliding a sliding cap in a cassette with a rotating knob operatable from the outside of the cassette, thereby making it possible to open and closed the detection hole. CONSTITUTION: The finger is inserted into a recess 32 form the outside of the one side face 4c of a cassette casing 4 and the outer periphery 33b of the rotating knob 33 is directly rotationally operatable in arrow (c), (d) directions by this finger in this detection hole opening/closing mechanism. The sliding cap 36 is slid to the open position in the arrow (b) direction via a gear 37 and rack 38 when the knob 33 is rotationally operated in the arrow (c) direction. The one recess 40a, then engages with a small projecting part 39 overcoming its elasticity and positions the cap 36 at the open position. The detection hole 16a is opened and the nonrecordable state (state of presence of erronious erasing prevention) of a magnetic tape is set. The cap 36 is slid to the close position of the arrow (a) direction via the gear 37 and the rack 38 when the knob 33 is rotationally operated in the arrow (d) direction. The other small recessed part 40, then, engages with the projecting part 39 and the cap 36 is set in the close position. The hole 16a is closed and the recordable state of the tape is attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cassette containing a tape-shaped recording medium or a disk-shaped recording medium, and more particularly to a detection hole opening / closing mechanism for opening / closing a detection hole such as an erroneous erasure prevention hole.

[0002]

2. Description of the Related Art Conventionally, as an example of a cassette, FIG.
And there is a tape cassette 1 called an 8 mm video cassette, as shown in FIG. This tape cassette 1
It has a flat and oblong rectangular parallelepiped cassette housing 4 in which upper and lower halves 2 and 3 formed of synthetic resin are fitted from above and screwed together. A magnetic tape (not shown) having a tape width of 8 mm, which is a recording medium, is wound around the pair of left and right tape reels 5 and housed in the cassette housing 4.

An opening 6 is formed on the front surface 4a and the bottom surface 4f of the cassette housing 4. The opening 6 is made of synthetic resin and has a substantially U-shaped front cover 7 in plan view. And an inner lid 8 arranged along the center of the inside of the front lid 7 are attached so as to be openable and closable in conjunction with each other in the vertical direction. Then, the magnetic tape passed so as to traverse the front side of the opening 6 in the left-right direction is completely sealed by the front lid 7 and the inner lid 8 so as to wrap it from the front and back. Then, the front lid 7 and the inner lid 8 are interlocked with each other and rotated above the cassette housing 4 to open the magnetic tape that has been wrapped, and pull the magnetic tape forward from the inside of the cassette housing 4. Is configured to be able to.

A shallow recess 9 for attaching a label is formed on the rear surface 4b of the cassette housing 4, and a drive (recording and recording) is provided on the left and right side surfaces 4c and 4d of the cassette housing 4 near the rear surface 4b. And / or a pair of left and right recesses 10 which are convenient for removing the cassette from the reproducing device. In addition, a transparent window hole 11 is formed on the upper surface 4e of the cassette housing 4 for convenient confirmation of the remaining amount of tape.

The bottom surface 4f of the cassette housing 4 serves as a cassette mounting surface for the drive and also as a detection surface for various sensors and switches on the drive side.

A pair of left and right reel hub insertion holes 12 into which the reel hubs 5a of the pair of left and right tape reels 5 are inserted with play are formed on the bottom surface 4f, and the space between the reel hub insertion holes 12 is formed. A tape end sensor insertion hole 13 and a reel lock release hole 14 are formed in the front and rear of the central portion. A total of four cassette positioning pin insertion holes 15 are formed on the bottom surface 4f.

The back surface 4 of the bottom surface 4f which is also the detection surface
On the side b, three detection holes 16 are formed in each of the corner portions on the left and right side surfaces 4c and 4d, respectively. The detection holes 16 are for detecting the presence / absence of erroneous erasure prevention, the material of the magnetic tape, the recording time, and other types of various cassettes. Except for the detection hole 16a for detecting the presence / absence of erroneous erasure prevention, all the other detection holes 16 are configured as holes with a foldable lid integrally formed with the lower half 3, and these lids Depending on the presence / absence, a plurality of push switches on the drive side are configured to perform the above various detections.

Next, a detection hole opening / closing mechanism 21 for opening / closing the detection hole 16 provided in the conventional tape cassette 1 for detecting the presence / absence of erroneous erasure prevention will be described with reference to FIGS. 7 and 8.

The conventional detection hole opening / closing mechanism 21 is, as shown in Japanese Utility Model Laid-Open No. 58-170088, a rear surface 4b of the cassette housing 4 and a window hole 2 at a position near one side surface 4c.
2 is formed, and a slide lid 24 having a substantially L-shaped plan shape formed of synthetic resin in a hollow portion 23 integrally formed inside the cassette housing 4 inside the window hole 22 is a horizontal direction arrow a. , B direction slidably assembled.

Then, a small projection 24a for operation, which is integrally formed at the central portion on one end side of the slide lid 24, is inserted into the window hole 22 from the inside, and is integrally formed at the upper end portion on one end side of the slide lid 24. The elastic locking claw 24b is engaged with the positioning projection 25 integrally formed on the lower surface of the upper surface 4e of the cassette housing 4.

Then, from the outside of the back surface 4b of the cassette housing 4, a fingernail is raised on the small protrusion 24a in the window hole 22, or
Or, hook it with a pen tip etc.
By pushing and moving a in the arrow a direction or the arrow b direction, the slide lid 24 is slid in the central portion 23 in the arrow a direction or the arrow b direction between the open position shown in FIG. 7 and the closed position shown in FIG. Let At that time, the lock claw 24b is made to overcome the elasticity in the direction of the arrow a or the direction of the arrow b of the convex portion 25, so that the slide lid 24 is moved between the open position shown in FIG. 7 and the closed position shown in FIG. I am trying to position it.

Then, as shown in FIG. 7, the slide lid 2
8 is slid to the open position in the direction of arrow a and positioned, the detection hole 16a is opened to set the recording disabled state (state with erroneous erasure prevention) of the magnetic tape.
As shown in FIG. 6, when the slide lid 24 is slid to the closed position in the direction of the arrow b and positioned, the detection hole 16a is closed from the inside, and the recordable state of the magnetic tape (the state without erroneous erasure prevention) is set. Will be done.

When the tape cassette 1 is mounted in the drive, the open state and closed state of the detection hole 16a are detected by the push switch in the drive, and the presence / absence of the above erroneous erasure prevention is automatically detected. It is configured to be detected.

[0014]

However, in the conventional detection hole opening / closing mechanism 21, the finger cannot be directly put on the slide lid 24, and the fingernail is set on the small projection 24a in the window hole 22, or , Small projection 2 by hooking it with a pen tip etc.
4a has to be pushed and moved in the window hole 22 in the direction of arrow a or the direction of arrow b, and there is a problem that operability is very poor.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a detection hole opening / closing mechanism for a cassette, which has excellent operability in opening / closing the detection hole.

[0016]

A cassette detection hole opening / closing mechanism of the present invention for achieving the above object forms a detection hole on a detection surface of a cassette containing a recording medium, and opens / closes the detection hole. In the detection hole opening / closing mechanism of the cassette, the rotary knob is rotatably mounted in the cassette, is rotatable from the outside of the cassette, and is slidably mounted in the cassette, and is slid by the rotary knob. , And a slide lid that opens and closes the detection hole.

[0017]

In the cassette detection hole opening / closing mechanism of the present invention constructed as described above, the rotary knob can be directly rotated from outside the cassette with a finger, and the slide knob inside the cassette is slid by the rotary knob. The detection hole can be opened and closed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a tape cassette to which the present invention is applied will be described below with reference to FIGS. It should be noted that the same structural parts as those in FIGS.

First, the detection hole opening / closing mechanism 30 opens / closes the detection hole 16a shown in FIG. 4 for detecting the presence / absence of erroneous erasure prevention inside the cassette housing 4.

[Explanation of First Embodiment] Next, referring to FIG. 1 and FIG.
A first embodiment of the detection hole opening / closing mechanism 30 will be described below.

In the first embodiment, the hollow portion 3 is formed on the back surface 24 of the cassette housing 4 inside the position near one side surface 4c.
1, and a substantially arcuate recess 32 is formed outside one of the side surfaces 4c near the back surface 24.

A rotary knob 33 made of synthetic resin is attached to the upper and lower central portions of the hollow portion 31 so as to be rotatable in the directions of arrows c and d. The rotary knob 33 has a central shaft 33a with a flange integrally formed in the center of one side surface thereof fitted in a bearing hole 34 formed in an inner wall 4g integrally formed in the upper and lower halves 2 and 3. And rotatably supported.

The outer circumference 33b of the rotary knob 33
Is partially exposed through the insertion hole 35 formed in the side wall 4c ₁ in the recess 32. However, the recess 32 is formed so that a part of the outer periphery 33b of the rotary knob 33 does not protrude outward from the one side surface 4c of the cassette housing 4.
Housed within. Therefore, the outer circumference 3 of the rotary knob 33
Since part of 3b protrudes outward from the side surface 4c, it does not collide with other objects and be damaged.

In the hollow portion 31, a slide lid 36 made of synthetic resin is incorporated between the upper portion of the bottom wall 4f ₁ and the lower surface of the outer periphery 33b of the rotary knob 33. It is configured to be slidable in the directions of arrows a and b between the open position shown in FIG. 1 and the closed position shown in FIG. 2 on the wall 4f ₁ .

A gear (including teeth similar to a gear) 37 is formed on the outer circumference 33b of the rotary knob 33, and a horizontal rack (including teeth similar to a rack) 38 is formed above the slide lid 36. The gear 37 and the rack 38 are meshed with each other from above and below.

A small convex portion 39 forming a positioning means for positioning the slide lid 36 between the open position shown in FIG. 1 and the closed position shown in FIG. 2 is integrally formed on the bottom wall 4f _1. A pair of small recesses 40a and 40b which are alternately engaged with the small protrusions 39 are formed on the horizontal lower surface of the slide lid 36 at intervals in the directions of arrows a and b.

It should be noted that the slide lid 36 is formed with an elastic exerting slit 41 for alternately and smoothly engaging the pair of small concave portions 40 with the small convex portions 39 against the small convex portions 39, and has a central portion. A slide guide 42 of the slide lid 36 and the like are provided on the inner wall 4 g and the like in the unit 31.

Further, the small convex portion 39 constituting the positioning means.
The pair of small protrusions 40a and 40b may be formed between the side surface of the rotary knob 33 and the inner wall 4g.

The detection hole opening / closing mechanism 30 configured as described above
According to the first embodiment of FIG.
A finger can be inserted into the recess 32 from the outside of c, and the outer circumference 33b of the rotary knob 33 can be directly rotated by the finger in the directions of arrows c and d.

Then, as shown in FIG. 1, the rotary knob 3
When 3 is rotated in the direction of arrow c, the slide lid 36 is slid to the open position in the direction of arrow b via the gear 37 and the rack 38, and one small recess 40a engages the small projection 39 against elasticity. Then, the slide lid 36 is positioned at the open position. Then, the detection hole 16a is opened, and a recording disabled state (state with erroneous erasure prevention) of the magnetic tape is set.

Further, as shown in FIG. 2, the rotary knob 33
Is rotated in the direction of arrow d, the gear 37 and the rack 3
The slide lid 36 is slid to the closed position in the direction of the arrow a via 8 and the other small recess 40b is elastically engaged with the small projection 39 to position the slide cover 36 at the closed position. Then, the detection hole 16a is closed from the inside,
Recordable state of magnetic tape (state without erasure prevention)
Is set.

Then, as shown in FIG. 1, the detection hole 16a
When the tape cassette 1 set to the open state is loaded in the drive, the push switch for detecting the presence / absence of erroneous erasure prevention in the drive is inserted in the detection hole 16a and the push operation is not performed. Therefore, the drive can automatically determine the non-recordable state of the magnetic tape in the tape cassette 1 (the state with erroneous erasure prevention).

As shown in FIG. 2, when the tape cassette 1 having the detection hole 16a set in the closed state is mounted in the drive, the push switch for detecting the presence / absence of erroneous erasure prevention in the drive slides. The drive is pushed by the lid 36, and the drive can automatically determine the recordable state of the magnetic tape in the tape cassette 1 (state without erasure prevention).

[Description of Second Embodiment] Next, a second embodiment of the detection hole opening / closing mechanism 30 will be described with reference to FIG.

In the second embodiment, the gear 37 and the rack 3 are
Instead of 8, the rotary knob 33 and the slide lid 36 are interlocked by the convex portion 43 and the concave portion 44, and the rotary knob 33
The slide lid 36 is rotated by rotating the
Is designed to be slidable in the directions of arrows a and b. The other configurations are similar to those of the first embodiment.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and various modifications can be made based on the technical idea of the present invention.

For example, the present invention is not limited to a tape cassette containing a tape-shaped recording medium, but can be applied to a disk cassette containing a disk-shaped recording medium and other various cassettes containing various recording media. .

The detection hole opening / closing mechanism is not limited to the detection hole opening / closing mechanism for detecting the presence / absence of erroneous erasure prevention.
It can be applied to the opening / closing mechanism of the detection hole for various purposes such as the type of recording medium and recording time.

[0039]

The cassette detection hole opening / closing mechanism of the present invention constructed as described above has the following effects.

According to the first aspect of the present invention, the rotary knob can be directly rotated from the outside of the cassette with a finger, and the slide lid in the cassette can be slid by the rotary knob to open and close the detection hole. The operability of opening and closing the detection hole is very good. In addition, the opening / closing function from the inside of the detection hole by the slide lid has high reliability as in the conventional case.

According to the second aspect of the present invention, since the gear formed on the outer periphery of the rotary knob is meshed with the rack formed on the slide lid, the sliding operation of the slide lid by the rotary knob can be performed reliably and smoothly.

According to the third aspect of the present invention, since the rotary knob and the slide lid are connected by the convex portion and the concave portion, the structure is simple, the manufacturing is easy, and the cost is low.

According to a fourth aspect of the present invention, since at least one of the slide lid and the rotary knob is provided with positioning means for positioning the detection hole at two positions, an open position and a closed position, the detection hole is in an open state, Very reliable setting with closed state.

According to a fifth aspect of the present invention, a magnetic tape is stored as a recording medium, and a part of the outer circumference of the rotary knob is exposed in a recess formed on the side surface of the cassette. It is most suitable as a mechanism for opening and closing the detection hole for detection, and it is possible to expose a part of the outer circumference of the rotary knob to the outside of the cassette in the recess without protruding to the outside of the side surface of the cassette. Both damage prevention and operability can be secured.

[Brief description of drawings]

FIG. 1 shows a first embodiment of a detection hole opening / closing mechanism of a tape cassette to which the present invention is applied, and FIG. 1 (A) shows a partial cutout of a main part of a cassette housing in a detection hole opened state. 1B is a rear view, and FIG. 1B is a cross-sectional plan view taken along the line C-C of FIG.

2 (A) is a partially cutaway rear view of the main part of the cassette housing in the detection hole closed state in the first embodiment, and FIG. 2 (B) is FIG. It is a cross-sectional top view in the DD arrow of (A).

FIG. 3 (A) is a partially cutaway rear view of the main part of the cassette housing in the detection hole open state in the second embodiment, and FIG. 3 (B) is a detection hole closed state. FIG. 4 is a partially cutaway rear view of the main part of the cassette housing in the state.

FIG. 4 is a perspective view of the entire tape cassette to which the present invention is applied.

FIG. 5 is a perspective view of an upper surface side of a conventional tape cassette.

FIG. 6 is a bottom perspective view of a conventional tape cassette.

7A is a rear view of the main part of the cassette housing in the detection hole opening state of the conventional tape cassette detection hole opening / closing mechanism, and FIG. 7B is a rear view of FIG. A) A-A
It is a cross-sectional plan view taken along the arrow.

8A is a rear view of the main part of the cassette housing in the detection hole closing state of the conventional tape cassette detection hole opening / closing mechanism, and FIG. 8B is a rear view of FIG. BB of A)
It is a cross-sectional plan view taken along the arrow.

[Explanation of symbols] 1 tape cassette 4 cassette housing 4a front surface of cassette housing 4b rear surface of cassette housing 4c, 4d left and right side surfaces of cassette housing 4e top surface of cassette housing 4f bottom surface of cassette housing (detection surface) 16 Detection hole 16a Detection hole for detecting presence / absence of erroneous erasure prevention 30 Detection hole opening / closing mechanism 31 Hollow part 32 Recess 33 Rotating knob 33a Outer periphery of rotating knob 35 Insertion hole 36 Slide lid 37 Gear 38 Rack 39 Small convex portion (positioning means) ) 40 small recesses (positioning means) 41 slits 43 protrusions 44 recesses

Claims (5)

[Claims] 1. A detection hole opening / closing mechanism for forming a detection hole in a detection surface of a cassette in which a recording medium is housed and opening / closing the detection hole, wherein the detection hole opening / closing mechanism is rotatably mounted in the cassette and is outside the cassette. A detection hole opening / closing for a cassette, comprising: a rotary knob that can be rotationally operated from the above, and a slide lid that is slidably mounted in the cassette and that is slid by the rotary knob to open / close the detection hole. mechanism. 2. A cassette detection hole opening / closing mechanism according to claim 1, wherein a gear formed on the outer periphery of said rotary knob is meshed with a rack formed on said slide lid. 3. The cassette detection hole opening / closing mechanism according to claim 1, wherein the rotary knob and the slide lid are connected by a convex portion and a concave portion. 4. A positioning means for positioning the detection hole at two positions, an open position and a closed position, on at least one of the slide lid and the rotary knob. Alternatively, the cassette detection hole opening / closing mechanism according to claim 3. 5. The cassette according to claim 1, 2 or 3 or 4, wherein a magnetic tape is stored as a recording medium, and an outer circumference of the rotary knob is provided in a recess formed on a side surface of the cassette. A detection hole opening / closing mechanism for the cassette, which is characterized by exposing a part of the.