JPH07334892A - Detection switch for magnetic tape cassette - Google Patents

Abstract

PURPOSE:To reduce the number of components and to unnecessitate the aligning of each component by integrally arranging a contact part and a switch part. CONSTITUTION:The detection switch is provided with the switch part 400, the contact part 500 and a body 100, and the existence of an erroneous erase preventing pawl of a magnetic tape cassette with built-in auxiliary storage medium is detected by the switch part 400. The contact part 500 is brought into contact with input/output terminals of the auxiliary storage medium of the magnetic tape cassette loaded at the specified position, and plural contact pieces 510 constituting the contact part 500 are mounted on the body 100. The switch part 400 is provided with a pressing member 430 pressed by the erroneous erase preventing pawl of the magnetic tape cassette loaded at the specified position, a movable contact piece 410 turned on/off by the pressing member 430, and a fixed contact piece 420, then it is built in the body 100 and formed integrally with the contact part 500.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape cassette detection switch for detecting a magnetic tape cassette containing an auxiliary storage medium other than a magnetic tape, such as a magnetic tape cassette used in a digital video recorder.

[0002]

2. Description of the Related Art A magnetic tape cassette used in a digital video recorder has a magnetic tape for recording video / audio signals and also has auxiliary information such as data for discriminating the type of cassette and the magnetic tape thickness. , It has a built-in semiconductor memory as an auxiliary storage medium that stores the contents of recordings, titles, and the like.

Further, the magnetic tape cassette is provided with erroneous erasure prevention claws like the usual audio cassettes and video cassettes. The erroneous erasure prevention claw is for closing the erroneous erasure prevention claw, and the erroneous erasure prevention claw is detected by the switch section provided on the digital video recorder side for detecting the presence or absence of the erasure prevention claw. Then, the signal stored in the magnetic tape can be erased, and cannot be erased unless the erroneous erasure prevention claw is detected.

[0004]

However, in the magnetic tape cassette used in the digital video recorder, the input / output terminal of the auxiliary storage medium and the erroneous erasure prevention claw are provided close to each other. Therefore, if the contact part that contacts the input / output terminal and the switch part that detects the erroneous erasure prevention claw are separately provided, the cost will increase due to an increase in the number of parts, mutual alignment of each part, and an increase in manufacturing processes. It tends to be high.

The present invention has been devised in view of the above circumstances, and a contact portion that comes into contact with an input / output terminal of a magnetic tape cassette and a switch portion that detects an erroneous erasure prevention claw are integrated into a component. It is an object of the present invention to provide a magnetic tape cassette detection switch in which the number of points is reduced and the mutual alignment of each component is unnecessary.

[0006]

A detection switch for a magnetic tape cassette according to the present invention comprises a switch section for detecting the presence or absence of an erroneous erasure prevention claw of a magnetic tape cassette containing an auxiliary storage medium, and loading at a predetermined position. A magnetic tape cassette detection switch having a contact portion that comes into contact with an input / output terminal of an auxiliary storage medium of the magnetic tape cassette and a body to which a plurality of contact pieces constituting the contact portion are attached. Has a pressing member which is pressed by the erroneous erasure prevention claw of the magnetic tape cassette loaded at a predetermined position, and a contact piece which is connected and disconnected by the pressing member, and is incorporated in the body.

Further, the contact piece constituting the switch portion is
It is composed of a movable contact piece and a fixed contact piece, and is cantilevered by a base attached to the body.

A torsion coil spring is formed on the contact piece.

Further, the body is formed with a recess for leading out the contact portion of the contact piece.

Further, there is provided a cover provided with a cover side slit corresponding to the concave portion, and the cover is configured to lead out the contact portion of the contact piece from the cover side slit in a state of being attached to the body. ing.

[0011]

1 is a schematic exploded perspective view of a detection switch of a magnetic tape cassette according to an embodiment of the present invention, and FIG. 2 is a drawing of the detection switch of this magnetic tape cassette. The front view, the same figure (B) is a rear view, the same figure (C) is a side view, the same figure (D) is a plan view, and FIG. 3 is a drawing of the body constituting the detection switch of this magnetic tape cassette. The figure (A) is a plan view, the figure (B) is a rear view, the figure (C) is a side view, and the figure 4 is a drawing of a base constituting a detection switch of this magnetic tape cassette. A)
Is a plan view, (B) is a rear view, (C) is a front view,
5D is a sectional view taken along the line AA of FIG. 5D, and FIG. 5 is a drawing of a cover constituting the detection switch of this magnetic tape cassette, and FIG. (B) is a bottom view, (C) is a plan view, (D) is a side view, and (E) is a rear view.

FIG. 6 is a drawing of a movable contact piece which constitutes a switch portion of the detection switch of this magnetic tape cassette.
The figure (A) is a front view, the figure (B) is a plan view, and the figure 7 is a drawing of a fixed contact piece which constitutes the switch portion of the detection switch of this magnetic tape cassette. The figure (A) is a front view. 8A and 8B are plan views, and FIG. 8 is a drawing of a pressing member that constitutes a switch portion of the detection switch of the magnetic tape cassette. FIG. 18A is a plan view and FIG. Front view, FIG. 9
Is a drawing of a contact piece that constitutes a contact portion of the detection switch of this magnetic tape cassette.
Is a side view, FIG. 10B is a front view, FIG. 10 is a drawing of a magnetic tape cassette, FIG. 10A is a plan view, FIG. 10B is a front view, and FIG. 11 is a side view, FIG. 11 is a drawing of a different switch section, FIG. 11A is a side view, FIG. 11B is a front view, and FIG. FIG. 12 is a schematic perspective view of a cover according to another embodiment, which is a sectional view taken along line BB shown in FIG.

The detection switch of the magnetic tape cassette according to this embodiment includes a switch unit 400 for detecting the presence or absence of the erroneous erasure prevention claw 820 of the magnetic tape cassette 800 having a semiconductor memory (not shown) as an auxiliary storage medium built therein. , A magnetic tape cassette 80 loaded at a predetermined position
0 has a contact portion 500 that contacts the input / output terminal 810 of the semiconductor memory, and a body 100 to which a plurality of (four in the drawing) contact pieces 510 that constitute the contact portion 500 are attached. Four
Reference numeral 00 has a pressing member 430 pressed by the erroneous erasure prevention claw 820 of the magnetic tape cassette 800 loaded at a predetermined position, and a movable contact piece 410 and a fixed contact piece 420 which are connected and disconnected by the pressing member 430. is doing.

First, the magnetic tape cassette 800 will be described with reference to FIG. The magnetic tape cassette 800 is used in a digital video recorder, and has two rotors, a magnetic tape wound around the rotors, and a semiconductor memory as an auxiliary storage medium. The input / output terminal 810 of the semiconductor memory is
As shown in FIG. 10 (B), it is provided at the right end on the front side. Further, an erroneous erasure prevention claw 820 is also provided near the input / output terminal 810.

The body 100, as shown in FIG.
Vertical wall 110 having four recesses 111 on the top
The horizontal part 120 extending in the direction orthogonal to the vertical wall part 110 and the L-shaped wall part 130 having a substantially L shape in plan view are integrally formed.

The four recesses 111 formed in the vertical wall portion 110 are the contact pieces 510 of the contact portion 500.
Is a part from which the magnetic tape cassette 800
The input / output terminals 810 are provided at the same pitch.
Further, a projection 111A for supporting the attached contact piece 510 is provided above the recess 111. The width dimension of the recess 111 is set in consideration of the time and effort required when the contact piece 510 is attached.
It is set to be larger than the thickness dimension of 10.

A protrusion 112 for attaching a cover 300, which will be described later, is provided on a surface of the vertical wall portion 110 different from the surface on which the concave portion 111 is provided, that is, a side surface.

On the other hand, the inside of the horizontal portion 120 is hollow, and the switch portion 400 is set in the hollow. Further, a substantially conical projection 121 for positioning which positions the magnetic tape cassette 800 inside the digital video recorder is projected from the horizontal portion 120. Further, the horizontal portion 120 is provided with a through hole 122 through which the pressing rod 432 of the pressing member 430 forming the switch portion 400 projects.

Further, the cavity inside the horizontal portion 120 communicates with the recess 111, and the mounting portion 512 of the contact piece 510 held in the recess 111 is fitted therein.

The body 100 has an L-shaped wall portion 1
30 are provided. Between the L-shaped wall portion 130 and the vertical wall portion 110, a mounting piece 320 of the cover 300 is provided.
There is a gap that fits in.

The contact piece 510 is formed by bending a metal wire having conductivity and elasticity as shown in FIG. 9. One end side of the contact piece 510 serves as a contact portion 511 bent into a substantially hook shape, and the other end. The side is a mounting portion 512 that is bent into a substantially L shape. A torsion coil spring 513 is formed at a portion corresponding to the base end of the contact portion 511. The attachment portion 512 is provided with a curved portion 514 used when attaching to the body 100.

The contact piece 510 constructed in this way
Is attached to the body 100 by being fitted into the recess 111 of the body 100. At this time, the mounting portion 512 of the contact piece 510 is located in the cavity inside the horizontal portion 120, and the contact portion 511 projects outward from the recess 111.

On the other hand, the switch section 400 comprises a movable contact piece 410 shown in FIG. 6, a fixed contact piece 420 shown in FIG. 7, and a pressing member 430 shown in FIG. Movable contact piece 4
Reference numeral 10 denotes a bent metal plate having conductivity, which has a mounting base 411 and a substantially bifurcated contact part 412 extending from the mounting base 411 in a substantially right-angled direction. is doing. The contact portion 412 is provided with a downward protruding portion 413.

The fixed contact piece 420 is the movable contact piece 410.
Similarly to the above, one conductive metal plate is bent and formed, and has a mounting base portion 421 and a contact portion 422 extending from the mounting base portion 421 in a substantially perpendicular direction. The tip of the contact portion 422 is formed slightly thicker than the other portions.

Further, the pressing member 430 has a substantially U-shaped base portion 431 and a pressing rod 43 protruding from the base portion 431.
2 and 2 are integrally formed of an insulating synthetic resin. The pressing rod 432 is set to have a thickness capable of protruding from the through hole 122.

The base portion 200 is attached to the body 100 so as to close the cavity inside the horizontal portion 120, and also supports the movable contact piece 410 and the fixed contact piece 420 in a cantilevered manner. .

As shown in FIG. 4, the base 200 is provided with a contact piece attachment portion 210 to which both contact pieces 410 and 420 are attached. This contact piece attachment part 210 is 2
A fitting groove 211, which is formed in a stepped shape and into which the mounting base portions 411, 421 of the respective contact pieces 410, 420 are fitted.
212 has been opened. These fitting grooves 211 and 212
As shown in FIG. 4C, is formed in a substantially L shape on the side surface of the contact piece attachment portion 210 so as to match the attachment base portions 411 and 421. The attachment groove 211 is a portion to which the movable contact piece 410 is attached, and the attachment groove 212 is a portion to which the fixed contact piece 420 is attached.

Further, the base portion 200 has four through holes 220 (see FIG. 4A). The four through holes 220 connect the base portion 200 to the body 1
00, the mounting portion 512 of the contact piece 510 is led out to the outside. Reference numeral 230 in the drawing denotes a tongue provided with a mounting screw hole 231 for mounting the detection switch of the magnetic tape cassette to a board of an electronic device or the like.

When the body 100 is attached to the base portion 200, the through hole 122 of the body 100 is inserted into the movable contact piece 41.
It is located directly above the zero contact portion 412.
Therefore, the base portion 431 of the pressing member 430 has the movable contact piece 410.
Of the pressing rod 432 while being placed on the contact portion 412 of the
Is projected from the through hole 122 to the outside. The switch unit 400 is built in the body 100.

As shown in FIG. 5, the cover 300 has a cover side slit 31 corresponding to the recess 111 of the body 100.
1, a hanging part 310 provided with the hanging part 310, mounting pieces 320 provided on both sides of the hanging part 310, and a comb tooth-shaped part 330 provided on the back side of the hanging part 310 are integrally formed. is there.

That is, the cover 300 is attached to the body 10
0, the hanging part 310 is located on the front side of the vertical wall part 110 of the body 100, the comb tooth-shaped part 330 is located on the back side of the vertical wall part 110, and the mounting pieces 320 are on both sides of the vertical wall part 110. It is located on the surface and is adapted to engage with the projection 112.

The cover 300 is the body 100.
The contact portion 511 of the contact piece 510 is led out from the cover-side slit 311 in the state of being attached to the. Here, since the cover side slit 311 is formed to be slightly wider than the contact piece 510, the cover side slit 311 guides the displacement of the contact piece 510.

The operation of the detection switch of the magnetic tape cassette thus constructed will be described. First, a case where the magnetic tape cassette 800 having the erroneous erasure prevention claw 820 is loaded at a predetermined position will be described. Switch unit 400 of detection switch of magnetic tape cassette
Detects the erroneous erasure prevention nail 820. In other words, the pressing member 430 of the switch unit 400 causes the accidental erasure prevention claw 820
Then, the movable contact piece 410 is pressed by the fixed contact piece 420, and a signal to that effect is output.

Further, the input / output terminal 810 of the magnetic tape cassette 800 loaded at a predetermined position comes into contact with the contact piece 510 of the contact portion 500 of the detection switch of the magnetic tape cassette. As a result, the auxiliary information stored in the semiconductor memory built in the magnetic tape cassette 800 is transmitted to the digital video recorder side.

On the other hand, when the magnetic tape cassette 800 having no erroneous erasure prevention claw 820 is loaded, the erroneous erasure prevention claw 820 is not detected. That is, since the pressing member 430 of the switch part 400 is not pressed, the movable contact piece 410 and the fixed contact piece 420 do not come into contact with each other. This prevents the digital video recorder from recording even if the recording switch is operated.

Even in this case, the contact piece 510
Is in contact with the input / output terminal 810, and auxiliary information is transmitted to the digital video recorder side.

In the above embodiment, the switch section 400
Is a pressing member 430, the movable contact piece 410 pressed by the pressing member 430, and the movable contact piece 410 pressed.
However, the present invention is not limited to this.

For example, a push switch 900 as shown in FIG. 11 may be used as the switch section 400. The pressing switch 900 includes a pressing portion 920 movably attached to the body 910, a spring 930 that elastically biases the pressing portion 920 outward, and the body 910.
Has a pair of contact pieces 940 insert-molded inside thereof and a conduction piece 950 attached to the pressing portion 920.

That is, when the pressing portion 920 is pressed,
The pair of contact pieces 940 are electrically connected by the conduction piece 950. Normally, the pressing portion 920 is pushed up by the spring 930, so that the conducting piece 950 does not bring the pair of contact pieces 940 into conduction. In addition, the contact piece 940 is the body 91.
It is connected to a lead portion 950 protruding from 0.

The pressing switch 900 is replaced by the pressing portion 92.
If 0 is built in the cavity of the body 100 so as to project outward through the through hole 122, it can be used as the switch unit 400.

In the above-mentioned embodiment, the cover 300 is used.
And the contact piece 510 are completely separated from each other.
A cover 350 as shown in 2 may be used. This cover 35
Reference numeral 0 is a contact piece 510 formed by insert molding. In this case, the cover-side slit 3 of the cover 350
Only the contact portion 511 of the contact piece 510 projects from 51, and the other mounting portions 512 project below the cover 350 (however, the mounting portion 512 is not shown in FIG. 12).

As described above, by integrally forming the cover 350 and the contact piece 510, the cover 350 is attached to the body 100.
The contact piece 510 is attached to the body 1 at the same time.
00, and the step of attaching the contact piece 510 can be omitted.

[0043]

The detection switch of the magnetic tape cassette according to the present invention comprises a switch portion for detecting the presence or absence of the erroneous erasure prevention claw of the magnetic tape cassette containing the auxiliary storage medium, and the magnetic tape loaded at a predetermined position. In a detection switch of a magnetic tape cassette having a contact portion that comes into contact with an input / output terminal of an auxiliary storage medium of a cassette, and a body to which a plurality of contact pieces forming the contact portion are attached, the switch portion is loaded at a predetermined position. The magnetic tape cassette has a pressing member that is pressed by the erroneous erasure prevention claw and a contact piece that is connected and disconnected by the pressing member, and is built in the body. Therefore, since the switch portion and the contact portion can be integrally formed, it is possible to reduce the number of parts and eliminate the need for mutual alignment of the parts.

Further, the contact piece constituting the switch section is
It is composed of a movable contact piece and a fixed contact piece, and is cantilevered by a base attached to the body. Therefore, since the pressing force applied to the pressing member is reduced, the erroneous erasure prevention claw of the magnetic tape cassette can be detected more reliably.

Further, since the torsion coil spring is formed in the contact piece, the contact pressure with respect to the input / output terminal of the magnetic tape cassette can be easily set. Therefore, the contact piece can be surely brought into contact with the input / output terminal.

Further, since the body is formed with a concave portion for leading out the contact portion of the contact piece, the movement of the contact piece when contacting the input / output terminal becomes smooth, so that the contact can be made more reliably. You can

Further, there is provided a cover provided with a cover-side slit corresponding to the recess, and the cover is adapted to lead out the contact portion of the contact piece from the cover-side slit in a state of being attached to the body. There is. That is, since the contact piece does not swing laterally, the movement of the contact piece can be made smoother.

On the other hand, a pressing portion movably attached to the body, a spring for elastically urging the pressing portion outward, and a pair of contact pieces insert-molded inside the body. If the pressure switch is composed of a conductive piece attached to the pressing portion, and when the pressing portion is pressed, the pair of contact pieces is configured to be conductive by the conductive piece, the conventional pressing switch can be used as a switch. This is also advantageous in terms of cost.

If the cover is insert-molded with the contact piece, the contact piece can be attached to the body at the same time when the cover is attached to the body, so that the step of attaching the contact piece can be omitted.

[Brief description of drawings]

FIG. 1 is a schematic exploded perspective view of a detection switch of a magnetic tape cassette according to an exemplary embodiment of the present invention.

FIG. 2 is a drawing of a detection switch of this magnetic tape cassette, where FIG. 2A is a front view and FIG. 2B is a rear view.
The figure (C) is a side view and the figure (D) is a plan view.

3A and 3B are drawings of a body constituting a detection switch of this magnetic tape cassette, in which FIG. 3A is a plan view, FIG. 3B is a rear view, and FIG. 3C is a side view.

4A and 4B are drawings of a base constituting a detection switch of this magnetic tape cassette, in which FIG. 4A is a plan view, FIG. 4B is a rear view, and FIG. 4C is a front view. (D) is a sectional view taken along the line AA of FIG.

5A and 5B are drawings of a cover constituting a detection switch of this magnetic tape cassette, in which FIG. 5A is a front view, FIG. 5B is a bottom view, and FIG. 5C is a plan view. (D) is a side view and (E) is a rear view.

FIG. 6 is a drawing of a movable contact piece which constitutes a switch portion of the detection switch of this magnetic tape cassette, and FIG.
Is a front view, and FIG. 1B is a plan view.

FIG. 7 is a drawing of a fixed contact piece that constitutes a switch portion of the detection switch of this magnetic tape cassette, FIG.
Is a front view, and FIG. 1B is a plan view.

FIG. 8 is a drawing of a pressing member that constitutes a switch portion of the detection switch of this magnetic tape cassette, FIG.
Is a plan view, and FIG. 4B is a front view.

FIG. 9 is a drawing of a contact piece that constitutes a contact portion of the detection switch of this magnetic tape cassette, in which FIG. 9A is a side view and FIG. 9B is a front view.

FIG. 10 is a plan view of the magnetic tape cassette, FIG. 10A is a plan view, FIG. 10B is a front view, FIG. 10C is a bottom view, and FIG. .

FIG. 11 is a view of a different switch section, in which FIG. 11A is a side view, FIG. 11B is a front view, and FIG. 11C is a sectional view taken along line BB shown in FIG. Is.

FIG. 12 is a schematic perspective view of a cover according to another embodiment.

[Explanation of symbols]

 100 body 200 base 300 cover 400 switch part

[Procedure amendment]

[Submission date] June 23, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 10

[Correction method] Change

[Correction content]

[Figure 10]

Claims (7)

[Claims] 1. A switch unit for detecting the presence or absence of an erroneous erasure prevention claw of a magnetic tape cassette containing an auxiliary storage medium,
A contact portion that comes into contact with the input / output terminal of the auxiliary storage medium of the magnetic tape cassette loaded at a predetermined position;
In a detection switch of a magnetic tape cassette having a body to which a plurality of contact pieces constituting the contact portion are attached, the switch portion is pressed by an erroneous erasure prevention claw of the magnetic tape cassette loaded at a predetermined position. A detection switch for a magnetic tape cassette, characterized in that it has a member and a contact piece that is connected and disconnected by the pressing member, and is incorporated in the body. 2. The contact piece constituting the switch portion is composed of a movable contact piece and a fixed contact piece, and is cantilevered and supported by a base attached to the body.
Magnetic tape cassette detection switch described. 3. The detection switch for a magnetic tape cassette according to claim 1, wherein a torsion coil spring is formed on the contact piece. 4. The detection switch for a magnetic tape cassette according to claim 1, wherein the body is formed with a recess for leading out the contact portion of the contact piece. 5. A cover is provided with a cover-side slit corresponding to the recess, and the cover is such that the contact portion of the contact piece is led out from the cover-side slit when attached to the body. The detection switch of the magnetic tape cassette according to claim 4. 6. The switch portion includes a pressing portion movably attached to the body, a spring for elastically biasing the pressing portion outward, and a pair of contact pieces insert-molded inside the body. And a conductive piece attached to the pressing portion, and when the pressing portion is pressed, the pair of contact pieces are electrically connected by the conductive piece. The detection switch of the magnetic tape cassette described in 5. 7. The detection switch for a magnetic tape cassette according to claim 5, wherein a contact piece is insert-molded on the cover.