JPH03219479A - Disk cartridge - Google Patents

Abstract

PURPOSE:To excellently maintain the slidability of a shutter by fixing a shutter retaining plate to a cartridge case by using a double-sided adhesive tape and forming a gap between the shutter retaining plate and a recessed part surface of the case. CONSTITUTION:Plate fitting step parts 5 and 20 provided on the cartridge case 31 consisting of an upper case 1 and a lower case 2 are fixed with the shutter retaining plate 74 via the double-sided adhesive tape 77. The plate 74 is slightly protruded from the step parts 5 and 20, and a free end of a shutter plate 55 is inserted into the gap between the plate 74 and sliding recessed parts 4 and 19 without abutting the step parts 5 and 20 and the tape 77. By this method, the gap between the plate 74 and the surfaces of the recessed parts 4 and 19 can be secured constantly, and no protrusion of an adhesive is ensured. Consequently, the slidability of the shutter 54 is excellent, and the disk cartridge that is superior in its operation reliability is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to disk cartridges such as, for example, optical disk cartridges, optical-magnetic disk cartridges, and magnetic disk cartridges.

[Prior Art] This type of disk cartridge has conventionally consisted of an upper case and a lower case, with recesses provided at predetermined positions on the upper and lower case surfaces, and a head access opening formed in the recesses. , and it causes .

In order to prevent such lifting of the free end of the shutter plate, a shutter retaining plate extending in the direction of movement of the shutter is fixed to the surface of the cartridge case, and the side end of the shutter retaining plate opposite to the recess is inserted into the recess. A gap is formed between the side edge of the shutter holding plate and the recessed surface of the cartridge case, and the free end of the shutter plate is inserted into the gap, so that the free end of the shutter plate is aligned with the cartridge case. I made sure not to lift it off the surface of the case.

[Problems to be Solved by the Invention] In the conventional disk cartridge, adhesive was used to fix the shutter presser plate.

However, when fixing the shutter presser plate with adhesive, since the adhesive has fluidity, it is difficult to adjust the gap size between the shutter presser plate and the recessed surface of the cartridge case, and the gap size varies. . For this reason, the product includes a recording disk rotatably housed in a cartridge case, a shutter with approximately U-shaped sides with shutter plates on both sides, and a shutter that is elastically biased to the open position. For example, the head access opening is provided with an elastic biasing means such as a coil spring, and a shutter plate is disposed within the recess of the cartridge case, and the head access opening is opened and closed by the shutter plate.

In a disk cartridge having such a configuration, the overall shape is large, or even if the overall shape is not so large, the head access opening is integrated with the drive shaft insertion port and is an elongated hole-shaped opening. , the length of the shutter plate inevitably becomes longer.

As the length of the shutter plate increases in this way, it curls toward its free end or toward the outside of the cartridge case.
For example, when inserting a disc cartridge into a recording/playback device, there are problems such as the free end of the shutter plate getting caught on other parts within the device. Shutter sliding becomes poor.

Also, some of the adhesive protrudes into the gap between the shutter holding plate and the surface of the recess and solidifies, and each time the shutter is slid, the free end of the shutter plate comes into contact with the lumped adhesive. This impairs the sliding properties of the shutter.

Furthermore, it takes time for the adhesive to harden and the shutter holder plate to be fixed in place6, resulting in poor productivity.Furthermore, the shutter holder plate may shift in position before it is fixed, resulting in the product being manufactured. This may lead to a decrease in quality.

The purpose of the present invention is to eliminate such drawbacks of the prior art,
To provide a disk cartridge of stable quality, which has good productivity, can accurately maintain a gap between a shutter holding plate and a concave surface of a cartridge case at a predetermined dimension.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a cartridge case having a recess on at least one side and a head access opening formed in the recess, and a rotatable cartridge inside the cartridge case. The storage device includes a storage disk, a shutter having a shutter plate on at least one side, and elastic biasing means for elastically biasing the shutter to an open position.

In a disk cartridge in which a shutter plate is disposed in a recess of the cartridge case and the head access opening is opened and closed by the shutter plate, a shutter holding plate extending in the moving direction of the shutter is attached with double-sided tape near the recess of the cartridge case. , and the side end of the shutter holding plate facing the recess faces into the recess, and a gap is formed between the side end of the shutter holding plate and the surface of the recess of the cartridge case. The connection between the free end of the shutter and the double-sided tape will be explained with reference to the drawings.

The optical disk cartridge according to this embodiment mainly includes an upper case, a lower case, a recording disk, and a shutter.

The upper case 1 is made of synthetic resin such as polycarbonate, ABS resin, a mixture of polycarbonate and ABS resin, and polypropylene.

As shown in FIG. 2, an elongated head access opening 2 is formed in the substantially central portion of the upper case 1, and the same as the drive shaft insertion opening. Furthermore, as shown in the figure, a substantially rectangular sliding recess 4, which is slightly stepped down from the upper surface 3 of the upper case 1, is provided in a substantially left half region including the head access opening 2. At the opposite end of the sliding recess 4 from the front surface of the upper case, there is a plate mounting step 5 located at an intermediate height between the top surface 3 and the bottom surface of the sliding recess 4 along the sliding direction of the shutter, which will be described later. It extends.

Next to the sliding recess 4, there is an arrow indicating the insertion direction of the disk cartridge and the A-side display section 7, which is inserted into the gap so as not to touch.

[Operations] Double-sided tapes are formed by applying a thin layer of adhesive to both sides of a base material, and the thickness of the double-sided tape is mostly determined by the base material. Therefore, as mentioned above, if you use the means of fixing the shutter holder plate to the cartridge case using Ryoran tape, the side edges of the shutter holder plate and the car can be fixed.・As soon as the size of the gap formed between the ridge case and the concave surface becomes constant, there is no need for the shutter presser plate to come into pressure contact with the shutter plate as in the conventional case, and there is no protrusion like adhesive. . Due to the second reason, the slidability of the shutter can be maintained well.

Further, the workability is better than fixing with adhesive, and the shutter presser plate can be fixed efficiently and reliably.

[Example] Next, an optical disk cartridge according to an example of the present invention will be described. Further, reference holes 8a and 8b consisting of a long hole and a round hole are formed on the left and right sides near the rear of the upper case 1, and further behind these reference holes 8a and 8b is a recording layer for side A (first side). An operation port 9 for preventing accidental erasure and an operation port 10 for preventing accidental erasure for the 8th surface (second surface) recording layer are provided at symmetrical positions.

The operation port 9 and the detection port 10 are protected by a protector (
It is formed into a rectangle to allow movement of the erroneous erasure prevention member).

As shown in FIG. 3, side walls 1 are formed around the inner surface of the upper case 1 on the left, right, and rear sides, except for the front part of the upper case 1. Furthermore, inside this side wall 11 there are 4
Two circular arcuate ribs 12 are provided, and a disk accommodating portion 13 is defined inside the circular arcuate ribs 12.
A head access opening 2 is formed at the center of this accommodation portion 13, which also serves as a drive shaft insertion opening.

As shown in the figure, the front portions of the left and right side walls 11 are inclined inward by an angle θ, thereby facilitating insertion of the disk cartridge into the recording/reproducing apparatus. A guide groove 14 for guiding the movement of the shutter is formed on the inner surface of the front portion, and a spring hook pin 15 is provided protruding from the right corner of the front portion as shown in the figure.

On the inner surface of the upper case 1 and near the erroneous erasure prevention detection opening lo for the B-side recording layer, locking projections 16 facing inward are formed at predetermined intervals. Note that the above A of upper case 1
This locking convex portion 16 is not formed near the operation port 9 for preventing accidental erasure when surface recording is required.

The lower case 17 is also made of the same synthetic resin as the upper case 1, and as shown in FIGS. 5 and 6, there is an elongated head in the approximate center of the lower case along with the drive shaft insertion opening. An access opening 18 is formed.

Further, as shown in FIG. 5, on the surface of the lower case 17, like the upper case 1, a sliding recess 19, a plate mounting step 20,
Arrow 21, B-side display section 22, reference holes 23a, 23b, B
Side (second side) recording layer discussion 1 Next, the structure of the shutter 54 is shown in Figures 7 to 1.
This will be explained using Figure 3. This shutter 54 is composed of a shutter turner 55 and a slider 56.

The shutter plate 55 is made of a metal plate such as a stainless steel plate, and as shown in FIG.
7, and a connecting portion 58 that connects one end of both closing portions 57 to each other.
It is composed of , and its side profile is almost U-shaped. The closing portion 57 has a length sufficient to close the head access opening 2 (18) connected to the quick-acting shaft insertion opening 2a (18a). The longitudinal direction of the second closing portion 57 coincides with the rolling direction 59 of the Yatter plate 55. Metal plates have the property of curling along the rolling direction.

Therefore, if the short direction of the closing part 57 is made to match the rolling direction 59 of the shutter plate 55, when the closing part 57 curls in that direction, the entire length of the edges of both sides of the closing part 57 will be applied to the surface of the cartridge case 31. will be removed.

If this happens, the shavings (abrasion powder) will be removed from the cartridge case 31.
Herado accessory erasure prevention operation port 24 and side A (first
Side) Recording layer erroneous erasure prevention detection ports 25 are formed at predetermined positions.

Furthermore, on the inner surface of the lower case 17, as shown in FIG.
29 and a locking protrusion 30 are formed at predetermined positions. Note that the locking convex portion 30 is not formed near the erroneous erasure prevention operation opening 24 for the B-side recording layer of the lower case 17.

A cartridge case 31 is formed by combining the upper case 1 and the lower case 17, and an optical disk 32 (see FIG. 24) is rotatably housed within this cartridge case 31.

Although not shown, the optical disk 32 is made of a transparent disk-shaped substrate having a recording layer with minute irregularities such as pre-groups and pre-pits formed on one side, and is fixed with an adhesive to a through-hole in the inner circumference of the substrate. The device is comprised of a hub, an inner circumferential spacer and an outer circumferential spacer for adhering two substrates with a predetermined gap between them with the recording layer inside.

2 penetrates into the interior through the space opening 2.18 and adheres to the surface of the optical disc 32, adversely affecting the recording and reproducing characteristics.

As in this embodiment, if the longitudinal direction of the closing portion 57 is made to coincide with the rolling direction 59 of the shutter plate 55,
Even if the closed part 57 curls along that direction, the closed part 5
Since one end of the closing portion 7 is connected to the connecting portion 58, there is no edge, and only the free end side edge of the closing portion 57 comes into contact with the cartridge case 31. Since the length of the second free end side edge is extremely short compared to the total length of the edges on both sides of the closed portion 57, the amount of shavings (wear powder) generated is extremely small, and the above-mentioned adverse effects hardly occur. .

As shown in FIGS. 7 and 8, engagement claws 60 for engaging with the slider 56 are formed near the base portions of both of the closing portions 57 that communicate with the communication portions 58. As shown in FIGS.

The slider 56 is made of, for example, polyacetal (product name: Duracon), polyamide (product name: nylon), fluororesin (product name:
It is composed of self-lubricating molded materials such as Teflon (trade name), ultra-high molecular weight polyethylene, and synthetic resins mixed with appropriate amounts of various solid lubricants.

When polycarbonate is used as the cartridge case 31 and polyacetal is used as the slider 56 that comes into sliding contact with the cartridge case 31, the properties of each material are shown below.

Cartridge case 31 (polycarbonate) (1) Tensile strength 620 [kg/cm”3 (2)
Tensile elongation at break Wa20]%1 (3) Bending modulus 2.3 Hardness 77 (M scale) <6) Heat distortion temperature 134℃ (18,6k
g/cm") (7) Linear expansion coefficient 8X10-' [cm/cm/
℃5 (11) Water absorption rate o22 [Z] (24 hours in water at 23°C) (12) Molding shrinkage rate Approximately 0.02 [mm/mm] As shown in FIGS. 9 to 13, the slider 56 is It mainly consists of a shutter plate attachment part 61 and a narrow part 62.

At the intermediate position of the shutter plate mounting portion 61.

Engagement grooves 63 into which the engagement claws 60 of the shutter plate 55 fit are formed on both sides. Further, an inclined portion 6 is provided at the end of the shutter plate mounting portion 61 opposite to the narrow portion 62.
4 is formed.

A shutter opening arm 65 (recording and reproducing device) is provided at the end of the narrow portion 62 opposite to the shutter plate mounting portion 61.
A contact portion 65 is formed with which the tip of the contact portion contacts.

As shown in FIGS. 10 to 13, a retaining groove 67 that engages with the front portion of the cartridge case 31 extends from the shutter plate mounting portion 61 to the entire length of the narrow portion 62 on both sides. Furthermore, this (8) specific gravity
, 20 (9) Water absorption rate 0.20 [Z] (23℃
(24 hours in water) (10) Molding shrinkage rate 0.5 to 0.7 [Z] (flow direction) (polyacetal) 620 [kg g/cm"] 40 ['1 980 [kg g/, cm'3 2 .64X1F)'[kg g/cm"]"+, +lpk
g-cm/cm) Slider 56 (1) Tensile strength (2) Tensile elongation at break (3) Bending strength (4) Bending modulus (5) Izot impact strength (notched) (6) Rockwell hardness ( M scale) (7) Heat distortion temperature (18.6 kg/cm") (8) Vicat softening point (9) Coefficient of linear expansion (10) Specific gravity 0 110 ['C 162 [m] 10-' [cm/cm /℃1,416 A protrusion 69 is provided below the retaining groove 67, and this protrusion 69 is inserted into the guide grooves 14 and 29 of the upper and lower cases 17. As shown in FIGS. 10 and 11, a spring hook hole 68 is formed below the inclined portion 64. As shown in FIGS.

Insert the shutter plate attachment part 61 of the slider 56 between the closing parts 57 and 57 of the shutter plate 55, and insert the engaging claw 6° provided in the closing part 57 into the engagement groove 63 of the shutter plate attachment part 61. By fitting the shutter plate 55 into the slider 5G and deforming it inward, the shutter plate 55 is attached to the slider 5G, thereby forming the shutter 54.

A coil spring 70 is used to elastically urge the shutter 54 to the closed position of the cartridge case 31.

As shown in FIGS. 14 and 15, this coil spring 70 has a coil portion 71 in the middle portion, and an annular portion 7 at one end that fits onto the spring hook pin 15 of the upper case 1.
2 is formed, and the shutter 54 (slider 5
6) The spring hook has a protruding locking end 73 that is inserted into the hole 68.

As shown in FIG. 16, a shutter holding plate 74 made of a metal plate such as a stainless steel plate is fixed to the plate mounting step 5 (20>) provided on the cartridge case 31 with a double-sided tape 77. ing.

This double-sided tape 77 has adhesive layers 7G and 76 formed on both upper and lower surfaces of a film-like base material 75. The width of this double-sided tape 77 is made slightly narrower than the width of the plate mounting step 5 (20), so that the adhesive
(20) so that it does not protrude.

Further, as shown in the same figure, the shutter holding plate 74 protrudes slightly from the plate mounting step 5 (20), and the shutter plate 55 is free in the gap formed between it and the sliding recess 4 (19). The end is plate mounting step 5 (
20) and the double-sided tape 77 so as not to contact them.

The base material 75 of the double-sided tape 77 is illustrated in FIGS.
8) is a diagram for explaining the relationship between the dimensions of the closing portion 57 of the shutter 54 and the sliding recess 4 (19).

As shown in these figures, head access opening 2 (18
) is the width of Ll, the width of the closing portion 57 is L2, and the width of the sliding recess 4 (19) is L3, then there is a relationship of Ll<L2<L3.

As shown in FIG. 18, when the closure part 57 is in the open position, the head access opening 2 (18)
However, one side end 79 of the closing part 57 does not directly collide with one side @80 of the sliding recess 4 (19), and there is no space between both ends 79 and 80. A gap G1 is formed. Note that this gap G1 is formed.

The positions of the starting ends 8, 81 of the guide grooves 14, 29 in the upper and lower cases 17 are determined.

For example, polyester, polyethylene, polypropylene, polyamide, polyvinyl chloride, paper, woven fabric, non-woven fabric, etc. are used.

Further, as the adhesive, for example, acrylic, silicone, vinyl acetate, coumaron resin, phenol, terpene resin, synthetic polyterpene resin, aromatic hydrocarbon resin, aliphatic hydrocarbon resin, rosin derivative, etc. are used. In particular, acrylic and silicone adhesives are prized because they are pressure-sensitive adhesives with excellent moisture resistance and heat resistance.

The physical properties of a double-sided tape in which a polyester film is used as the base material 75 and silicone-based and vinyl acetate-based adhesive layers are formed on both sides thereof are as follows.

0 (see Figures 3 and 6). In other words, this starting end 81 serves as a stopper for the shunter 54 (closed portion 57) in the open position.

Furthermore, as shown in FIG. 19, when the closing part 57 is in the closed position, the head access opening 2 (18) is completely open, and the other side end 82 of the closing part 57 is in the sliding recess 4 ( 19), and a gap G2 is formed between the two side ends 82 and 83. Note that the stroke of the shutter 54 is determined so that this gap G2 is formed.

As mentioned above, since the cartridge case 31 is molded from synthetic resin, and the closing part 54 is made of metal,
When the shutter 54 is closed, the side edges 79 and 80 collide, or when the shutter 54 is opened, the side edges 80
2 and the side end 83 are unfavorable because abrasion powder of the synthetic resin will be generated. Therefore, in the present invention, the gap G1,
The design is such that G2 is formed. Especially shutter 5
4, the restoring force of the coil spring 70 causes the shutter 54 to return instantaneously with a strong pressing force.
Since the impact force of 9.80 is large, the formation of the gap G1 is important.

FIGS. 20 and 21 are views showing the open position of the shutter 54 and the state of the coil spring 70 that can be placed in the open position. One end of the coil spring 70 is engaged with the spring hook hole 68 of the slider 56, and the other end is engaged with the spring hook pin 15, thereby always elastically biasing the shutter 54 toward the open position.

When this optical disk cartridge is inserted into a recording/reproducing device, the shutter opening arm 65 on the device side comes into contact with the contact portion 66 of the slider 56, as shown in FIG. Further, when the optical disk cartridge is inserted, the shutter opening arm 65 rotates clockwise relative to the drawing.

This rotational movement causes the shutter 54 to move in the direction of the arrow as shown in FIG.
) is released. As the shutter 54 moves, the coil spring 70 is compressed as shown in FIG.
are in the open position 3.Due to the fact that the inner surfaces of the upper and lower cases 17 are provided with circular arcs 712 and 27, etc., sink marks (dents) may occur on the surfaces of the upper and lower cases 17 due to molding. There is. Among the surfaces of the upper and lower cases 17, the upper surface 3 has a textured pattern, so even if a sink mark occurs, it is not very noticeable, but the sliding recess 4
．． No. 19 is not provided with a grain pattern for the above-mentioned reasons, and furthermore, if the surface roughness is made as small as possible, sink marks will become noticeable, which is not desirable in terms of appearance.

Therefore, the present inventors conducted various studies on the lower limit value of the surface roughness Rz at which sink marks are not noticeable, and the lower limit value was found to be 5 μm.
I found that. Therefore, by regulating the surface roughness Rz of the sliding recess 4.19 within the range of 5 to 15 μm, it is possible to prevent the generation of abrasion powder and to make sink marks less noticeable.

FIG. 29 is a diagram for explaining a second embodiment of the present invention. The difference from the first embodiment shown in FIG. 16 is that a bent portion 100 is formed at the free end of the shutter plate 55. , when the bent portion 100 is in the form of being tucked under the shutter holding plate 74, the narrow portion 62 of the slider 56 corresponds to the head access opening 2 (18), allowing insertion of an optical head (not shown). ing.

As shown in FIGS. 2 and 5, upper and lower cases 1,
The upper surface 3 of the disk cartridge 17 is textured to prevent the disk cartridge from easily slipping off when held in the hand, and to have a surface roughness Rz of approximately 25 μm from the design point of view.

However, if the sliding recess 4.19 also has such a surface roughness, abrasion powder is likely to be generated due to the sliding contact of the shutter 54, which is not preferable. Therefore, as a result of various studies on the appropriate surface roughness of the sliding recess 4.19, the inventors of the present invention found that when the surface roughness Rz is set to 15 μm or less, preferably 10 μm or less, the generation of abrasion powder due to the sliding contact of the shutter 54 is almost eliminated. I found out that there is no.

In order to prevent the generation of abrasion powder as described above, it is preferable to make the surface roughness of the sliding recess 4.19 as small as possible, but if it is too small, the appearance of the sliding recess 4.19 is unfavorable. In other words, 4 teru. Therefore, almost all of the shutter plate 55 is substantially flush with the cartridge case 31 and the shutter holding plate 74.

FIG. 30 is a diagram for explaining a third embodiment of the present invention, and the difference from the first embodiment shown in FIG. 16 is that a plurality of (two in this embodiment) double-sided tapes 7a , 7b, the gap size between the recess 4 (19) and the shutter holding plate 74 can be adjusted. In the first embodiment, a metal shutter plate 55 was used, but when a synthetic resin shutter plate is used, the shutter plate becomes relatively thick. This embodiment may be applied in such a case.

FIG. 31 is a diagram for explaining a fourth embodiment of the present invention. The difference from the first embodiment shown in FIG. A head access opening (not shown) is formed in the center of the recess 4. Further, the shutter holding plate 74 is also formed to be long according to the width of the recess 4.

In the above embodiments, a double-sided recording type disc cartridge has been described, but the present invention is not limited thereto, and can also be applied to a single-sided recording type disc cartridge.

Furthermore, although the above embodiments have been described with respect to the case of an optical disk cartridge, the present invention is not limited thereto, and can be applied to other disk cartridges such as an optical-magnetic disk cartridge or a magnetic disk cartridge.

[Effects of the Invention] As described above, in the present invention, since the shutter holding plate is fixed to the cartridge case using double-sided tape, a constant gap can be ensured between the shutter holding plate and the surface of the recess. Also, there is no adhesive oozing out like in the conventional case. Therefore, the slidability of the shutter is extremely good, making it possible to provide a disk cartridge with excellent operational reliability.

In addition, 1. Compared to the conventional method of fixing the shutter presser plate with adhesive, it is easier to work with. Figure 15 is a front view of the coil spring, and Figure 16 is an enlarged sectional view of the vicinity of the shutter presser plate. , FIG. 17, FIG. 18, and FIG. 19 are diagrams for explaining the relationship among the width dimensions of the head access opening, the closing portion, and the recess. FIG. 20 is a partially exploded diagram showing the state of the coil spring in the shutter closed position. Plan view.

21 is a partially exploded plan view showing the state of the coil spring in the shutter open position; FIG. 22 is a plan view of the optical disk cartridge; FIG. 23 is a plan view of the optical disk cartridge;
The figure is a side view of the optical disk cartridge, and FIG.
FIG. 25 is a front view of the optical disk cartridge, FIG. 25 is a rear view of the optical disk cartridge, FIG. 26 is a bottom view of the optical disk cartridge, FIG. 27 is a plan view of the optical disk cartridge with the shutter open, FIG. 28 is a front view of the optical disc cartridge with the shutter open.

FIG. 29 shows a second embodiment of the present invention. The zigzag presser plate can be securely fixed, and productivity can be improved.

[Brief explanation of drawings]

1 to 28 are for explaining the optical disk cartridge according to the first embodiment of the present invention, FIG. 1 is a front view of the upper case, FIG. 2 is a plan view of the upper case, Figure 3 is a bottom view of the upper case, Figure 1 is a front view of the lower case, and Figure 5 is a plan view of the lower case. Fig. 6 is a bottom view of the lower case, Fig. 7 is a plan view of the shutter plate, Fig. 8 is a sectional view of the shutter plate, Fig. 9 is a plan view of the slider, and Fig. 10 is a plan view of the slider. A side view, FIG. 11 is an enlarged front view of the slider, FIG. 12 is an enlarged rear view of the slider, FIG. 13 is an enlarged sectional view taken along the line 1-1 in FIG. 10, and FIG. 14 is a plane view of the coil spring. figure. FIG. 8 is an enlarged sectional view of the vicinity of the eighth shutter presser plate. FIG. 30 is an enlarged sectional view of the vicinity of the shutter holding plate for explaining the third embodiment of the present invention. FIG. 31 is a plan view of an optical disk cartridge for explaining a fourth embodiment of the present invention. 1. Upper case, 2. Head access opening, 4. Recess, 17. Lower case, 18. Head access opening.
19 ... recess, 31 cartridge case, 3
2 Optical disc, 54 Shutter, 55 Shutter back, 56...Slider, 70...
・Coil spring, 75 ・・Base material, 76 Adhesive layer, 77
double-sided tape. Fig. 7 Fig. 8 JP-A-3-219479 (11) Z b6 56 JP-A-3-219479 (12) Fig. 27 Fig. 28

Claims (5)

[Claims] (1) A cartridge case having a recess on at least one side and a head access opening formed in the recess, a recording disk rotatably housed in the cartridge case, and a shutter having a shutter plate on at least one side; an elastic biasing means for elastically biasing the shutter to a closed position, a shutter plate is arranged in a recess of the cartridge case, and a head access opening is opened and closed by the shutter plate, wherein the cartridge case A shutter presser plate extending in the moving direction of the shutter is fixed to the vicinity of the concave portion with double-sided tape, and the side end of the shutter presser plate facing the concave portion faces into the recess, and the shutter presser plate is fixed with double-sided tape. A disc cartridge, wherein a gap is formed between a side edge of the shutter and a surface of the recess of the cartridge case, and the free end of the shutter is inserted into the gap so as not to come into contact with the double-sided tape. (2) In claim (1), the double-sided tape comprises:
A disk cartridge characterized by being a tape coated with a pressure-sensitive adhesive having excellent moisture resistance and heat resistance on both sides of the base material. (3) The disk cartridge according to claim (1), wherein the gap size between the side edge of the shutter holding plate and the surface of the recess of the cartridge case can be adjusted by stacking a plurality of sheets of the double-sided tape. (4) In claim (1), the head access opening is a vertically elongated opening integrated with a drive shaft insertion port;
A disk cartridge characterized in that the elongated head access opening is opened and closed by the shutter plate. (5) In claim (1), the recess and the head access opening are formed on both sides of the cartridge case, and the shutter has a substantially U-shaped side surface with shutter plates provided on both sides, and the cartridge case A disc cartridge characterized in that a shutter presser plate is fixed to each side of the disc cartridge.