JPS5972687A - Shutter assembling method of disc cassette for recording and reproducing - Google Patents

Abstract

PURPOSE:To attain easily and surely the assembling of a disc cassette case and a shutter by designing the length of the projection of the shutter to a specified value and providing a spring retain section to the shutter. CONSTITUTION:The both ends of a spring 17 are coupled to each retain section of cassette housing 1 and the shutter 11. In turning the shutter 11 around a cut- off section 33 of a notch 32 of the housing 1, the housing 1 and the shutter 11 are assembled easily and surely by being guided with a groove 21 so that the 1st projection 18 of the shutter 11 longer than the notch length of the 1st guide groove 21 does not come out. Further, since the spring 17 is coupled at assembling, the inconvenience such as the tangling of the spring free end before the assembling is not produced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a disk cassette for recording and reproducing various analog and digital signals, and in particular, it is composed of an upper and a lower half, and at least one of the upper and lower halves. A cassette casing with a head insertion hole formed on one side, a disk-shaped recording medium rotatably housed within the cassette casing, and an upper and lower piece integrally formed to form a rectangular cross section. , inserted into the outside of the upper and lower halves from one end edge of the cassette housing and movably attached along the one end edge to open and close the head insertion hole on at least one of the upper or lower half. The shutter made and
a spring for moving and energizing the shutter from a position where the head insertion hole is opened to a position where it is closed; a second guide groove, and first and second guide grooves that are integrally provided inside the lower piece of the shutter and spaced apart from each other in the length direction of the guide groove and that are engaged with the first guide groove. and a third protrusion that is engaged with the second guide groove, and the first guide groove is located at a position where a part of one end edge of the cassette lif body is biased toward the closed position of the shutter. The present invention relates to a disc cassette for recording and reproducing, which has cutouts for detecting the prevention of erroneous insertion formed in the upper and lower nofs at a depth that crosses the middle portion of the disc cassette.

BACKGROUND TECHNOLOGY AND PROBLEMS Conventional disc cassettes for recording and playback of this type were assembled by moving the shutter parallel to one edge of the cassette body and inserting it into the cassette housing.
When the shutter moves, the first guide groove passes through the cut portion cut by the notch of the first guide groove.
The length of the projection in the longitudinal direction of the guide groove had to be made smaller than the cut portion of the first guide groove in the longitudinal direction of the guide groove. Therefore, after the shutter is assembled, when the first protrusion passes through the cut part of the first guide groove when the shutter is moved, the first protrusion moves outward from the cut part of the first guide groove. There was a defect in that the shutter could easily be removed from the cassette housing, causing the shutter to easily come off unexpectedly.

In addition, in conventional disc cassettes for recording and reproducing of this kind, when the upper and lower halves are connected, one end of the spring is locked to a dowel provided integrally with the upper or lower halves, and the spring is connected at the same time as the upper and lower halves are connected. One end is inserted between these upper and lower halves to lock them. However, in this assembly method, the springs protrude from one end edge of the assembled cassette t-a body in the form of whiskers, so it is difficult to transport them to the next shutter assembly process. In some cases, the springs may unexpectedly become entangled with each other, making post-processing extremely troublesome.

Summary of the Invention The present invention provides a method for determining the length of the first protrusion in the longitudinal direction of the guide groove that passes through a portion cut by the notch of the first guide groove when the shutter moves. The guide length of the cut portion of the groove is configured to be longer than the cut portion in the longitudinal direction, and at least the first protrusion among the first, second and third protrusions is formed on at least one of the upper and lower pieces. The inner side is formed of a protrusion bent at a y right angle, and has a position biased toward the closed position of the shutter at one end edge of the cassette housing, and a position biased toward the open position inside the shutter. A pair of spring locking portions are provided at positions near the ends, and after both ends of the spring are locked with the spring locking portions, the first protrusion is removed from the cut portion of the first guide groove. The shutter is inserted into the first guide groove by being rotated in an oblique direction, and the shutter is rotated and inserted in an oblique direction from one end edge side of the cassette housing to the outside of the upper and lower halves. At the same time, the second and M6 protrusions are caused to cross over the lower half and pass through the first
and a method for assembling the shutter of a disc cassette for recording/reproduction in which the shutter is inserted into the second guide groove, the assembly is easy, the shutter is difficult to come off from the cassette housing after assembly, and the shutter is inserted into the second guide groove. and a spring that can be easily assembled.

EXAMPLE Hereinafter, an example of a recording/reproducing disk cassette to which the present invention is applied will be explained based on the drawings.

First, in FIG. 1, the cassette housing (1) is constructed as a thin square housing. This cassette housing (11 is an upper half (2) and a lower half 13) is composed of the upper and lower halves (21 + 31) which are fitted together from above and below and glued around the periphery, or the four corners are welded or screwed together. The upper and lower halves +21 and +31 are fixed together by an appropriate fixing method such as a stopper.
It is molded from a synthetic resin with appropriate elasticity, such as B8 resin. A disk-shaped recording medium (hereinafter simply referred to as a disk) (4) such as a magnetic disk made of a magnetic sheet is rotatably housed in a cassette housing (1, 1). As shown in the figure, the disk (4) is fitted into a circular hole (6) provided in the center of the lower half (3) by a disk (5) made of a magnetic material that is integrally fixed to the center of the disk (4). The upper half (2) and the lower half (3) are each provided with pad and head insertion holes (8).These inner insertion holes (8) are made up of long holes extending in the radial direction of the disk (4), and are arranged to face each other from above and below.The recording/reproducing surface of the disk (4) faces the head insertion hole (8). Next, a shutter Uυ is attached to the cassette housing (1) in a movable position. The upper piece (11a) is molded and has a rectangular shape.
A pair of window holes Q3) that correspond to the inner insertion holes (8) are provided on one end side of the lower piece (11b).

On the other hand, small rectangular recesses α are formed on the upper and lower surfaces of the one end edge (1a) of the cassette body (1). Then, the shutter (1υ is a cassette housing (11) with its upper and lower pieces (11a) and (11b) fitted in both upper and lower recesses (141) so as to straddle the cassette housing (11).
It is attached so that it can freely reciprocate linearly along one end edge (1a) of 1.

Next, FIGS. 2A and 2B show the opening and closing state of the inner insertion hole (8) by the shutter 0υ, and when the shutter (il+) is moved to the open position on one side as shown in FIG. 2A, The inner window hole 13 is overlapped on the inner insertion hole (8),
These inner insertion holes (8) are opened. Also shutter U
When υ is moved to the other side of the closed position as shown in Figure 2B,
Both window holes are laterally shifted from above the inner insertion holes (8), and these inner insertion holes (8) are closed by the upper and lower pieces (11a) (Ilb).

Furthermore, as shown in Fig. 5, the upper and lower parts of the shutter circle (11a
The vertical piece (1
A locking portion σ9 formed by bending or the like on a part of 1c)
As shown in FIG. 6, one edge of the cassette case (11
A spring (17) whose both ends (17aX17b) are locked to a locking part 061 which is a part of the shutter 1a) and which is integrally formed with the upper nose (2), for example, is disposed within the shutter 01). ing. The shutter (1υ) is energized by the spring aη to move from the open position to the closed position (in the direction of arrow a).Then, the shutter qD is moved to the open position (
When the spring 071 is moved in the direction indicated by the arrow, the spring 071 is pulled. Note that the shutter Uυ is locked in the open position by a locking structure to be described later, or when the lock is released, the shutter Uυ is automatically moved to the closed position by the tensile force of the spring cI and returned to the closed state. configured to be retained.

In addition, as shown in Fig. 5, the lower part of the shutter Uυ (iib
) formed inside the first, second, and sixth protrusions (119
As shown in FIGS. 2A, 2B, and 7 to 9, the μ field (A) is located at a first and a second guide groove tzaa, and the shutter Uυ is configured to be guided by the guide groove 12υ@ and slid between an open position and a closed position. At this time, as shown in FIGS. 2A and 2B, the leading edges (11d) of the upper and lower pieces (11a) (11b) of the shutter Uυ on the center side of the cassette housing (1) are connected to the opposing cassette housing (1).
1) both recessed portions (stepped portions (14
a) and is configured to slide in parallel to abutment.

Further, this recording/reproducing disk cassette is installed in a recording/reproducing apparatus with the shutter αυ moved to the open position as shown in FIG. 2A and locked, for example. Note that it is also possible to open the shutter Uυ by using the operation of inserting a cassette into the recording/reproducing device. Then, the disk (4) is placed on the disk drive rotating table installed in the recording/reproducing device.
is magnetically attracted and positioned by the disc (5). Then insert the cassette housing (1) from the head insertion hole (8).
) is brought into contact with the recording/reproducing surface of the disk (4), and
The top side of the disk (4) is held down by the pad inserted into the cassette housing (11) through the pad insertion hole (8).

In this state, the disk (4) is rotated and the recording/reproducing head scans the disk (4) in the radial direction, thereby performing a desired recording/reproducing operation.

Next, according to FIGS. 6A to 4C, the shutter at+
A locking structure for locking the above-mentioned open position will be explained.

First, as shown in FIG. 6A, at the end of the shutter (II) opposite to the inner window hole OJ side, a square hole is formed in a part of the corner between the lower piece (11b) and the vertical piece (11c). A formed retaining part ridge is provided. Next, the area between the locking claws where the retaining part is engaged is the lower half (3) of the cassette housing (1).
It is integrally molded and provided on the lower surface side of the edge portion of 1. In this case, the lock claw (to) is arranged near the corner (6a) on the shutter open position side shown in FIG. 6A. Between the corner (6a) of the lower half (31) and the corner (2a) of the upper half (2) facing it, there is a required length jl and width 1 as shown in FIG. 6A.
2 Surin) C10 is formed 0 Therefore, the upper and lower parts
-F (2) The corner (2a03a) of 131 is the other part ζ
It is thinner than this and is configured to be able to bend against elasticity in the directions of arrows C and d in FIG. 40. As shown in FIG. 4A, the locking claw (30a) is formed in a vertical plane such that its locking surface (30a) can be locked at right angles to the locking part (30a), and the locking surface (30a)
The end surface opposite to a) is formed into a slope (30b).

According to the lock structure configured as described above, the fourth A
When the shutter aυ in the closed position shown in the figure is moved in the direction of the arrow against the spring aη and moved to the open position shown in Fig. 4B, the lower piece of the shutter Uυ (i
The end of ib) is brought into contact with the lock claw (to), and the slope (3)
Due to the guiding action of 0b), the locking pawl (7) bends in the direction of arrow C in Fig. 4B against its elasticity, and the locking part moves over the locking pawl (7) and locks in the locking part 0. be done.

The locking surface (30a) of the locking claw (to) and the edge (29a) of the retaining part (c) are engaged at right angles, and the shutter lIυ is automatically locked in the open position.

Next, as shown in Fig. 4C, pinch the corners (2a) and (3a) of the upper and lower halves +21 +31 from above and below with your fingertips, press the corners (2aX3a) in the directions of arrows C and d, and press the corners (2a 2a) (3a) are deflected in a direction toward each other against these elasticities. At the same time, the locking claw (7) is bent, and the locking claw (7) is disengaged from the engaging portion. As a result, the lock of the shutter αυ in the open position is released, and the shutter Uυ is pushed in the direction of arrow a by the tensile force of the spring (17) described above and automatically moved to the closed position.

In addition, in the lock structure explained above, the shutter U
To release the lock at the open position of υ, press the upper and lower halves (
We have explained how to pinch and press the corners (2aX3a) of 21 (31) from above and below with your fingertips, but for example, when automatically taking out this recording/playback disc cassette from the recording/playback device, It is also possible to press from above and below.

By the way, as shown in Figs. 2A and 2B and Figs. 7 to 9, among the six protrusions α (11 (a)) of the shutter Uυ, the first and second protrusions (J8 Q'J are The cassette body A (is engaged with the first guide groove Qυ of 11, and is configured such that the sixth protrusion (sha) is engaged with the second guide groove (sha) and guided respectively. Yes, and the first
and the third protrusion aFj (company) is the lower piece of the shutter 0υ (
11b) consists of a protrusion bent at right angles, and a second protrusion α old shutter 0υ
The cross section drawn on the inside of the lower piece (11b) is constituted by a protrusion having a Y-arc shape. And the tip edges (
11d) and the stepped portion (14a) of the cassette casing (11), the first and sixth protrusions α8 (to) align with the first and second guide grooves as shown in FIGS. 7 and 9. (21) (
It is set so that it is positioned and slid so as to contact one side surface (21aX22a) of 2a. This is because when bending the first and sixth protrusions Q to the wings, the edges (18a) and (20a) of these cut surfaces are formed on the opposing first and second protrusions. is
(2Jl) The other side of (22) (21b) (22b
) is set to prevent jagged damage to the side surfaces (21b) and (22b). Note that the second protrusion a9 is connected to the first guide groove (
It is set to be positioned and slid at the center of #21). Further, in the present invention, it is sufficient that at least only the first protrusion α barrel is a bent protrusion, and therefore the sixth protrusion (to) is a protrusion that is drawn in the same way as the first protrusion 09. Also good.

On the other hand, this type of recording/playback disc cassette has a notch C for detection to prevent incorrect insertion when inserting it into a recording/playback device.
32 is a cassette case (as shown in FIGS. 2A and 2B).
It is provided on a part of the -f4 edge (1a) of II. Note that this notch Oa is at a position where the shutter Uυ is biased toward the closed position side, and the first guide groove (a state in which it vertically penetrates the upper and lower halves (2) and (3) at a depth that crosses the middle part of 2D). When the recording/playback disc cassette is inserted into the recording/playback device, if the direction of insertion is correct, the erroneous insertion detection member provided in the recording/playback device will be inserted into the notch 0. On the other hand, if the direction of insertion is incorrect, the incorrect insertion detection member will cut out and prevent the cassette case from being inserted into the country (one edge (1a) of 11). The erroneous insertion detection member is moved to detect its erroneous insertion.Therefore, it is necessary to make the movable stroke of the erroneous insertion detection member as large as possible.
21) is deeply cut to a depth that crosses the area.

On the other hand, since the first guide groove Qυ is cut by the notch Oa, when the shutter 00 moves between the open position and the closed position, the first protrusion α frame is cut by the first guide groove (2υ It passes across the cut part (C) cut by the notch 0, and at that time, the first protrusion easily moves from the cut part to the outside of the first guide groove Qυ. When the shutter Uυ is pulled out, it becomes easy for the shutter Uυ to come off unexpectedly from one cassette (1).

Therefore, in the present invention, a method for assembling the shutter αυ is implemented which can prevent such detachment of the shutter αυ.

First, as shown in FIGS. 2A and 2B, the length 13 in the longitudinal direction of the guide groove of the first protrusion a barrel is set to the first guide groove CD.
The cutting part in the longitudinal direction of the guide groove of the cutting part Q! It is configured to be sufficiently longer than 4.

Then, the shutter (11) is attached to the cassette housing (
It is assembled in 11.

First, as shown in FIG. 10A, a pair of locking portions a9QeR provided on the shutter αυ cassette housing (11)
Lock both ends (17a) and (17b) of the second spring (I7).

Then, the shutter aυ is rotated once in the direction of arrow a' against the spring (17), as shown in FIG. 10B.
Attach the first protrusion Q8) of the shutter 09 to the cassette housing (1
) facing the notch C32+. Next, as shown in Fig. 10B, the shutter 11υ is rotated in the direction of the arrow b' to cut out the protruding portion of the thread 1, and the first guide # (2D
Insert it by turning it diagonally inside. Next, as shown in FIG. 10C, when the first protrusion a barrel is inserted into the first guide groove (2υ), the shutter Uυ is rotated in the direction of arrow C', and the second and protrusion tt1cn
In order to insert the shutter Uυ into the first and second guide grooves (21), insert the shutter Uυ into the upper and lower halves (2) from the one edge (1a) side of the cassette housing (1) using its upper and lower pieces (11a and 11b). Insert it by rotating it diagonally to the outside of +31.

In this case, since the second protrusion has a semi-circular cross section, the lower piece (ii) of the shutter (11)
Utilizing the elasticity of b), the lower half (3) is made to ride over and inserted into the first guide groove (211) with a snap.

On the other hand, regarding the sixth protrusion (to), the second guide groove (22+) formed in a part of the lower no. (Insert it into 2.

Therefore, when the third protrusion (to) is also formed as a drawn protrusion like the second protrusion (tl), the guide groove Oa
is unnecessary, and like the second protrusion a9, the shutter aυ
Using the elasticity of the lower piece (11b), the lower half (3) can be used to ride over the lower half (3) and inserted into the second guide groove (2) with a snap.

Through the above steps, the shutter αυ is assembled into the case Ht body (1) as shown in FIG. 10D. And after the assembly
In this case, as shown in FIG. 10D, the length 13 of the first projection type 0 corresponds to the cutting portion lJ of the first guide groove seam.
Since the length is longer than 4, as the shutter 0υ moves, the first protrusion α~ will reach the cutting part (to) of the first guide groove (21).
When passing through, the first protrusion 081 always straddles the cutting part (2) with its both ends, and the first protrusion 081 moves from the cutting part to the outside of the first guide groove civ. Unexpected disconnections are definitely prevented.

As shown in Figure 10E, there is a risk that the sixth protrusion (4) may also come off outside the second guide groove (34) at the guide groove (34) when the old shutter is moved. The sixth protrusion and the guide so that when the protrusion faces the guide groove <341, the first and second protrusions 0 to α are always guided within the first guide groove 12D. Since the interval 1516 of the first and second protrusions 081 (Ii) with respect to the groove (2) is set, the sixth protrusion (2@) is also connected to the guide groove (9).
) from the second guide groove (23).

Further, as described above, the spring (171) is locked to the cassette housing (11) and the shutter aυ only when the cassette housing (11) is already assembled and the shutter (2) is assembled thereto.

Effects of the Invention According to the present invention, as described above, the shutter can be easily assembled, and the shutter is difficult to come off from the cassette housing after assembly, resulting in a highly reliable shutter. Further, after assembling the cassette case, the shutter and spring can be easily assembled, which is convenient.

[Brief explanation of the drawing]

The drawings show an embodiment of a recording/reproducing disk cassette to which the present invention is applied, and FIG. 1 is a perspective view of the cassette housing with the shutter disassembled, FIG. 2A, and FIG.
Figure B is a bottom view of the main part, Figures 6A and 6B, explaining how the head insertion hole of the cassette case is opened and closed by the shutter.
The figure is a perspective view of the main part explaining the first embodiment of the locking and unlocking structure in the open position of the shutter, Figures 4A to 4C are cross-sectional views taken along line IV-IV in Figure 6B, and Figure 5 6 is a partially cutaway perspective view of the shutter, FIG. 6 is a partially cutaway perspective view of the main part showing the locked state of the spring, and FIG. 7 is a partially cutaway perspective view of the shutter.
Figure A is a cross-sectional view taken along line ■-■, Figure 8 is a cross-sectional view taken along line FIG. 10E is a bottom view of the main parts for explaining the procedure for assembling the shutter. In addition, in the symbols used in the drawings, (1)・・・・・・・・・・・・Cassette case (
1a)・・・・・・・・・One edge (2)・・・・
・・・・・・・・・・・・Upper level +31・・・・・・
・・・・・・・・・Shinohefu (4)・・・・・・・・・
・・・・・・Disk-shaped recording medium (8)・・・・・・
・・・・・・・・・Insertion hole (Ill・・・・・・・・・
・・・・・・Shutter (Ila)・・・・・・・・・
Upper piece (iib)...Lower piece (Ilc)...Vertical piece u9... Window hole (I9αυ・
・・・・・・・・・Latching part an・・・・・・・・・
・・・・・・Spring QIO・・・・・・・・・・・・
・・・Protrusion of kite 1 (I■・・・・・・・・・・・・
・・Second protrusion (4)・・・・・・・・・・・・・・・
Sixth protrusion (21)・・・・・・・・・・・・First guide groove■・・・・・・・・・・・・Second guide groove・・・・・・・・・・・・・・Engagement part (2
9a)......End edge (to)......Lock claw (30
a)......Lock surface 02...
・・・・・・Notch (to)・・・・・・・・・・・・
・・・Cutting part (goods)・・・・・・・・・・・・Guiding groove. Agent Saturn Masaru! Yoshio Tsuneko I Toshiki Sugiura

Claims (1)

[Claims] A cassette housing consisting of an upper and a lower half and having a head insertion hole formed in at least one of the upper and lower halves, a disk-shaped recording medium rotatably housed in the cassette housing, and the upper and lower halves. A piece is integrally provided and has a rectangular cross section, and is inserted into the outside of the upper and lower halves from one edge side of the cassette housing and is movably attached along the one edge of the upper or lower half. a shutter configured to open and close the head insertion hole on at least one of the lower pieces; a spring that biases the shutter to move the shutter from a position where the head insertion hole is opened to a position where it is closed; and one end edge of the cassette housing. first and second guide grooves parallel to one end edge of the lower half provided in the vicinity of the lower half; and integral with the guide grooves spaced apart in the length direction inside the lower piece of the shutter. first and second protrusions provided in the cassette housing and engaged with the first guide groove, a third protrusion engaged with the second guide groove, and a part of one end edge of the cassette housing. and a notch for detecting erroneous insertion prevention formed in the upper and lower halves at a depth that crosses the intermediate portion of the first guide groove at a position where the shutter is biased toward the closed position. In the disc cassette for use in the disc cassette, the length in the longitudinal direction of the guide groove of the first protrusion that passes through the part cut by the notch of the first guide groove when the shutter moves is defined as the length of the guide groove of the pallet 1. The guide groove of the cutting part is configured to be longer than the cutting part in the longitudinal direction, and at least the first projection among the first, second, and sixth projections is formed at a right angle to the inside of at least one of the upper and lower pieces. The projection is formed of a protrusion that is bent into a position, and is located at one end edge of the cassette housing at a position biased toward the closed position of the shutter, and at a position inside the shutter near the end at the open position side. After providing a pair of spring locking portions and locking both ends of the spring to the spring locking portions, the first protrusion is inserted into the first guide groove from the cut portion of the first guide groove. The shutter is inserted from one end edge side of the cassette housing to the outside of the upper and lower halves by rotating the shutter from an oblique direction, and at this time, 3. A method of assembling a shutter for a disc cassette for recording and reproducing, characterized in that the protrusion No. 3 is inserted into the first and second guide grooves by passing over the lower half.