JPH0836856A - Disk cartridge - Google Patents

Abstract

PURPOSE:To increase the moving amount of a twist coil and also to ensure moving energization by forming a twist coil spring so that the length of an arm of the fixed end side is longer than the length of an arm of the movable side. CONSTITUTION:The twist coil spring 35 is formed so that the length from the coil part 65 to a curved supporting part 70 supported by a spring supporting part 69 of a main body of the cartridge is longer than the length from the coil part 65 to a locking part 68 engaged with a locking groove 71 of a shutter member 32. By this twist coil spring 35, the length of the arm 67 forming the fixing side to the cartridge main body is made longer than the length of the arm 66 forming the movable side supported by the side of a shutter member 34 moving for the displacement. Consequently, the power against the shutter member 34 on the side of the arm part 66 becomes larger as compared with the power against the spring supporting part 69 on the side of the longer arm part 67, when the thickness of the arm parts 66,67 and a spring constant are common. As a result, a large force for moving and energizing the shutter member 34 in the direction closing the opening part is attained by the arm part 66.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc cartridge containing a disc-shaped recording medium used as a recording medium for information signals, and more particularly to opening and closing a recording and / or reproducing opening formed in the cartridge body. The present invention relates to a disk cartridge provided with a spring that urges a shutter member to move in a closing direction of an opening.

[0002]

2. Description of the Related Art Conventionally, a disc cartridge containing an optical disc for recording an information signal or a disc such as a magneto-optical disc has been used as a recording medium of a disc recording and / or reproducing apparatus. In this disc cartridge, the disc is housed in a cartridge body formed by abutting and coupling a pair of an upper half and a lower half. Thus, the disc cartridge protects the disc by storing the disc in the cartridge body.
That is, it is possible to prevent the recording and / or reproducing information signal from being lost due to scratches on the signal recording surface of the disc, or dust and fingerprints adhering to the recording medium, and deterioration of the recording and reproducing characteristics. I am trying to do it.

The disc cartridge is mounted on the disc recording and / or reproducing apparatus with the disc being housed in the cartridge body. Therefore, the cartridge main body is provided with an opening for recording and / or reproduction for exposing a part of the signal recording surface of the disk housed in the cartridge main body to the outside in the radial direction across the inner and outer circumferences. . When the disc cartridge is mounted on the disc recording and / or reproducing device, recording and / or recording on an optical head or the like arranged on the disc recording and / or reproducing device side is performed through an opening provided in the cartridge body. Alternatively, the reproducing means is configured to face the disc.

If the opening provided in the cartridge body is left open, dust will enter the cartridge body through this opening, or fingers will be inserted into the cartridge body, and the signal of the disc It will stain the recording surface. Furthermore, foreign matter may enter through the opening that has been left open, causing an accident such as scratching the signal recording surface of the disc.

Therefore, a shutter member for opening and closing an opening provided in the cartridge body is attached to the cartridge body of the disk cartridge. This shutter member records and / or records a disc cartridge on the disc.
Alternatively, when mounted on a reproducing apparatus, the shutter opening operation member provided on the apparatus side moves and opens the opening, and when the disk is ejected from the disk recording and / or reproducing apparatus, it is provided inside the cartridge body. It is moved in the direction of closing the opening by receiving the biasing force of the biasing means such as a torsion coil spring, and is held at the position where the opening is blocked. That is, the opening provided in the cartridge body is always closed by the shutter member when the disc cartridge is not used in the disc recording and / or reproducing apparatus such as during storage.

When the disc cartridge is not attached to the disc recording and / or reproducing apparatus and is not in use, it is necessary to prevent the opening provided in the cartridge body from being opened carelessly. If the opening is opened carelessly, the signal recording surface of the disk housed in the cartridge body may be contaminated or damaged as described above.

In order to prevent such an inadvertent opening of the opening, in the cartridge body, in order to regulate the free movement of the shutter member for closing the opening, the shutter member is closed in the direction of closing the opening. A spring member that constantly urges is provided. A torsion coil spring is used as a spring member that urges the shutter member to move.

In the torsion coil spring, one arm portion is locked to the shutter member and the other arm portion is fixedly attached to a part of the inside of the cartridge main body so that the shutter member is attached in a direction to close the opening portion. I am energetic. The torsion coil spring allows the shutter member to move by elastically displacing the pair of arms in the close leg direction in which they approach each other. The movement stroke of the shutter member is determined by the movement stroke of the pair of arm portions, that is, the amount of movement of the pair of arm portions from the opened position to the closed position.

[0009]

By the way, when a recording and / or reproducing opening having a size larger than that of the cartridge body is formed, it is necessary to attach a large shutter member to the cartridge body. It is also necessary to increase the movement amount of the shutter member. In order to increase the movement stroke of the shutter member, it is necessary to increase the movement stroke of the pair of arm portions of the torsion coil spring that biases the shutter member in the direction of closing the opening. In order to increase the moving stroke of the pair of arm portions, the length of the arm portions becomes long, and the torsion coil spring itself becomes large. As a result, the shutter member is allowed to move over a range from the position where the opening is closed to the position where the opening is completely opened, and the shutter member is urged in the direction to close the opening with sufficient urging force. Therefore, it becomes impossible to store a large-sized torsion coil spring that can be carried out in the cartridge body having a limited size.

Conventionally, the torsion coil spring is mounted so that the tip end side of the arm portion is fixed to a shaft that is erected in the cartridge body. However, when the fixed end side is fixed to the shaft, a pair of torsion coil springs are provided. In some cases, the smooth elastic displacement of the arms is restricted, and the movement stroke of these arms is restricted.

Further, when the shaft for fixing the torsion coil spring is planted in the cartridge body, it is necessary to plant the shaft having sufficient strength corresponding to the elastic displacement force of the torsion coil spring, and the synthetic resin material is molded. It becomes difficult to form the cartridge body that is formed as a result.

Therefore, according to the present invention, even when a shutter member having a large movement stroke as compared with the size of the cartridge body is attached, the shutter member is urged to move to a position where the opening is closed with a large spring force. SUMMARY OF THE INVENTION An object of the present invention is to provide a disc cartridge capable of ensuring the protection of the disc by preventing the opening from being opened accidentally.

Further, according to the present invention, the movement amount of the arm portion of the torsion coil spring arranged in the cartridge body of which size is limited is made large, and the shutter member can be surely moved to the position where the opening is opened. An object is to provide an eggplant disc cartridge.

A further object of the present invention is to provide a disk cartridge capable of smoothly opening and closing a torsion coil spring that urges a shutter member to move.

[0015]

In order to achieve the above-mentioned object, a disk cartridge according to the present invention accommodates a disk-shaped recording medium rotatably and at least a signal recording area of the disk-shaped recording medium. A cartridge main body formed with a recording and / or reproducing opening partly exposed to the outside over the inner and outer circumferences, and movably attached along one side surface of the cartridge main body, and formed on the cartridge main body Shutter member for opening and closing the recorded and / or reproducing opening, and the other arm extended from the coil portion by locking the tip end side of one arm portion extended from the coil portion to the shutter member. The front end side of the portion is disposed in the cartridge body with a part of the cartridge body supported, and the shutter member is urged in a direction to close the opening. A length of the torsion coil spring from the center of the coil portion to the supporting end of the other arm portion with respect to the cartridge body, and the shutter member of the one arm portion from the center of the coil portion. It is made longer than the length to reach the locking end.

A torsion coil spring used in a disk cartridge according to the present invention has a curved support having a curved surface on the outer peripheral surface side supported by the cartridge body, at the tip end side of the other arm portion supported by a part of the cartridge body. Parts are formed.

[0017]

In the disk cartridge according to the present invention, when the shutter member is moved in the direction to open the opening, one arm portion is fixed with the fixed end of the other arm portion fixed to a part of the cartridge body as a fulcrum. Moves toward the other arm. At this time, the coil portion also moves to the fixed end side of the other arm portion.

Further, the length from the center of the coil portion of the torsion coil spring to the supporting end of the other arm portion with respect to the cartridge main body is the length from the center of the coil portion to the engaging end of the one arm portion to the shutter member. However, since the length is longer, the amount of force applied to the shutter member via one arm portion side having a shorter length is larger than the amount of force applied to the fixed end side of the other long arm portion.

Further, in the torsion coil spring, when the pair of arms are elastically displaced and the opening / closing operation is performed, the bending surface on the outer peripheral surface side of the bending support portion formed at the tip end side of the other arm portion supported by the cartridge body is The cartridge is slidably contacted and rotated on a supporting portion provided on the cartridge body.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a specific embodiment of the disk cartridge according to the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the disc cartridge according to the present invention includes a cartridge body 32 that rotatably accommodates a disc 31 such as an optical disc or a magneto-optical disc that serves as a recording medium for information signals such as audio signals and image signals. A shutter member 34 movably attached to the cartridge body 32 to open and close a recording and / or reproducing opening 33 provided in the cartridge body 32, and a direction in which the shutter member 34 closes the opening 33. A torsion coil spring 35 as an urging means for moving and urging the shutter lock member 21 for holding the shutter member 35 moved to a position where the opening 33 is closed is mainly configured.

The cartridge body 32, which rotatably accommodates the disk 31, has a pair of upper half 36 and lower half 37 formed in a rectangular shape by molding a synthetic resin material such as polycarbonate resin as shown in FIG. It is formed by butt-joining and. On the peripheral edges of the upper and lower halves 36, 37 forming the cartridge main body 32, rising walls 38a, 39a forming front side wall 38, rear side wall 39, and side wall 40, 41 which are butted against each other and form the outer peripheral side wall of the cartridge main body 32. , 40a, 41a and 38b, 39b, 40b, 41b are formed. The rising wall 3 is provided on the inner side of the main surface of the lower half 37.
8b, 39b, 40b, 41b, which is located on the circumference substantially inscribed and is housed in the cartridge body 32.
Standing peripheral wall 43 that constitutes the disk storage portion 42 of No. 1
Are formed. Moreover, when the lower half 37 is butted against the inner surface of the main surface of the upper half 36, the lower half 3
7 is engaged with the inner peripheral side of the rising peripheral wall 43 provided in 7,
A ridge portion 44 that forms the disc storage portion 42 together with the rising peripheral wall 43 is formed so as to project. This ridge 44
Is also formed so as to be located on the circumference substantially inscribed in the rising walls 38a, 39a, 40a, 41a.

In the area of each corner portion surrounded by the protrusion 44 of the upper half 36 and the rising walls 38a, 39a, 40a, 41a, a screw hole into which the fixing screw 45 is screwed is formed. A compound protrusion 47 is provided so as to project. In addition, the rising peripheral wall 43 of the lower half 37 and the rising wall 38b,
In the area of each corner portion surrounded by 39b, 40b, 41b, a fitting hole 48 into which the tip side of a fitting protrusion 47 provided on the upper half 36 side fits and a fixing screw 45 is inserted is formed. It is set up.

The upper and lower halves 36 formed as described above,
The rising walls 38a, 39a, 40a provided on the 37,
41a and 38b, 39b, 40b, 41b are butted, the raised peripheral wall 43 is engaged with the ridge 44, the fitting protrusion 47 is fitted into the fitting hole 48, and the fixing screw 45 is fitted through the fitting hole 48. Insert this fixing screw 45 into the fitting protrusion 47
The cartridge main body 32 is integrally formed by being screwed into the screw hole 46 of FIG. Inside the cartridge body 32 formed by butt-joining the upper and lower halves 36, 37 as shown in FIGS. 1 and 2, the outer peripheral side wall including the front side wall 38, the rear side wall 39 and the side wall 40, 41. A disk storage portion 42 is formed so as to be substantially inscribed therein, and the disk 31 is rotatably stored in the disk storage portion 42.

The above-mentioned cartridge body 32 is formed by connecting the upper and lower halves 36 and 37 with the fixing screw 45. However, in the case where the upper and lower halves 36 and 37 are made of synthetic resin material, Fixing screw 45
Front side wall 3 of the cartridge body 32 without using
8. Rising walls 38a, 39a, 40 that form the back wall 39 and the side walls 40, 41 but abut against each other
The abutting surfaces of a, 41a and 38b, 39b, 40b, 41b and other abutting portions may be formed by welding using an ultrasonic welding method or a heat welding method.

On the side of the lower half 37 of the cartridge body 32, as shown in FIGS.
On the other hand, an opening 33 for recording and / or reproducing for recording an information signal or reproducing the information signal recorded on the disc 31 is provided. The opening 33 is formed in such a size that a part of the signal recording area is exposed to the outside over the inner and outer circumferences, including the central portion where the center hole 31a of the disk 31 housed in the cartridge body 32 is formed. Has been done. That is, the opening 33 is formed in the cartridge body 3
It is formed in a substantially rectangular shape from the central portion of 2 to the vicinity of the front side wall 38. When a disc cartridge is mounted in a disc recording and / or reproducing apparatus, a portion of the opening 33 facing the central portion where the center hole 31a of the disc 31 is bored is mounted on the side of this apparatus. A disc table entry portion 33a into which the disc table enters is formed, and a portion of the signal recording area of the disc 31, which is continuous with the disc table entry portion 51a and faces the inner and outer circumferences of the signal recording area of the disc 31, is disc recording and / or The head facing portion 33b faces an optical head as an information signal recording and / or reproducing means provided on the reproducing apparatus side.

The cartridge body 32 has an opening 3 for recording and / or reproducing provided in the cartridge body 32.
A shutter member 34 for opening and closing 3 is movably attached. The shutter member 34, as shown in FIG.
A thin plate-shaped metal material is formed by punching and bending, and a plate-shaped shutter portion 51 having a size large enough to close the opening 33, and the shutter portion 51.
And a slide guide portion 52 formed on the base end side of the. The slide guide portion 52 includes a rising piece 52a corresponding to the height of a rising wall 38b formed on the lower half 37 of the front side wall 38 of the cartridge body 32, and an extension direction of the shutter portion 51 from the tip end side of the rising piece 52a. It is composed of a holding piece 52b projecting from the. The holding piece 52b holds the rising wall 38b formed on the lower half 37 which is a part of the cartridge main body 32 in cooperation with the base end side portion of the shutter portion 51. A pair of slide guide pieces 53 that engage with slide guide grooves 53 formed on the front end surface of the rising wall 38b formed on the lower half 37 are cut and raised on the holding piece 52b.

In the shutter member 34, as shown in FIG. 2, the shutter portion 51 extends from the outside of the cartridge body 32 onto the opening 33, and the holding piece 52b of the slide guide portion 52 is attached to the front surface of the cartridge body 32. The rising wall 38b, which is inserted into the cartridge body 32 through the insertion groove 54 formed in the wall 38 and is formed in the lower half 37 that constitutes the front wall 38, serves as a base end side portion of the shutter portion 51 and a holding piece 52b. It is attached to the cartridge body 32 so as to be held between them. At this time, the slide guide piece 53 provided on the holding piece 52b is engaged with the slide guide groove 53, so that the shutter member 34 is prevented from coming off from the cartridge body 32, and the slide guide piece 53 slides. 2 along the front side which is one side of the cartridge body 32 guided by the groove 53.
It can be moved in the direction D and the direction D.

The holding piece 52 of the slide guide portion 52
The insertion groove 54 into which the b is inserted is formed with the rising wall 38b formed on the lower half 37 together with the rising wall 3 on the upper half 36 side forming the front wall 38 of the cartridge body 32.
The upper end side of 8a is formed by a notch.

Further, inside the cartridge body 32, there is mounted a shutter lock member 21 for holding the shutter member 34 movably mounted on the cartridge body 32 as described above at the position where the opening 33 is closed. The shutter lock member 21 is an area surrounded by a front wall 32 that forms the outer peripheral side wall of the cartridge body 32, one side wall 40 that is orthogonal to the front wall 32, and a rising peripheral wall 43 that forms the disc storage portion 42. It is arranged at one corner on the front surface side of a certain cartridge body 32.

The shutter lock member 21 used here
The shutter lock member 21 will be described in detail.
As shown in FIG. 5, it is integrally formed by molding a synthetic resin material such as polyacetal resin. When the shutter lock member 21 is attached to a disc cartridge, the shutter lock member 21 engages with an engagement piece serving as an engagement portion formed by cutting and raising a part of the shutter member movably attached to the cartridge body accommodating the disc. An arm portion 23 for shutter lock, which has a locking concave portion 22 serving as a locking portion, which is formed on one side of the tip end side, and the arm portion 2
3 and an elastic piece 24 extending from the base end side. The shutter lock arm portion 23 is formed to have a width and a wall thickness that have rigidity such that the arm portion 23 for shutter lock cannot be easily elastically displaced. Recess 2 for locking the arm 23
On the base end side opposite to the front end side where 2 is formed, a cylindrical pivotal support portion 26 is formed around a pivotal support hole 25 inserted into a support shaft planted in the cartridge body. There is.

Further, on the front end side where the locking recess 22 of the arm portion 23 is formed, when it is mounted on a disc cartridge, a pressing operation is performed by a shutter opening operation member provided on the disc recording and / or reproducing device side. A bulging portion 28 having a pressing operation portion 27 formed on one side surface is bulged. The pressing operation portion 2 provided on the bulging portion 28
7 is formed as an inclined surface that is gently curved from the tip of the arm portion 23 toward the locking recess 22.

On the other hand, the elastic piece 24 is formed so as to be easily bent and deformed by being pressed, and a predetermined elastic restoring force is applied in the bent and deformed state. That is, the elastic piece 24 is formed in a plate shape which is thinner than the arm portion 23 having rigidity and which is substantially linear. This elastic piece 2
Numeral 4 is integrally extended from one side of the outer peripheral surface of the pivot portion 26 formed on the base end side of the arm portion 23 so as to form a substantially straight line. As shown in FIG. 6, the extension direction of the elastic piece 24 with respect to the arm portion 23 is extended in the direction of the dip angle θ ₁ with respect to the extension line P extending from the base end side to the tip end side of the arm portion 23.
The dip angle θ is an acute angle of at least 90 degrees or less. Therefore, the angle θ ₂ of the region surrounded by the arm portion 23 and the elastic piece 24 is an obtuse angle.

The shutter lock member 21 related to the main body is
Elastic piece 24 integrally extended from the base end side of the arm portion 23
Is extended substantially linearly in the direction of the dip angle θ ₁ with respect to the extension line P extending from the base end side to the tip end side of the arm portion 23. Therefore, when molding the synthetic resin material, The flow of the resin filled in becomes smooth. That is, since there is no bent portion at an acute angle in the portion extending from the arm portion 23 to the elastic piece 24, a smooth resin flow is guaranteed during molding. Since the resin flows smoothly during molding, when the shutter lock member 21 according to the present invention is formed by molding a synthetic resin material, the shutter lock member 21 is molded with high precision without generating molding distortion and is durable. It is made to have excellent properties.

As shown in FIG. 6, the shutter lock member 21 formed as described above pivotally supports the pivotal support portion 26 through the pivotal support hole 25 on the support shaft 55 erected on the inner surface of the lower half 37. The shutter lock arm portion 23 extends along the front wall 38 of the cartridge body 32 in which the shutter member 34 moves, and the elastic piece 24 faces toward the one side wall 40 orthogonal to the front wall 38. The cartridge main body 32 is provided at a corner portion on the front surface side.

By the way, on the support shaft 55, when the pivot support portion 26 of the shutter lock member 21 is pivotally supported, the shutter lock arm portion 23 is provided with the front wall 38 of the cartridge body 32.
Is planted in a position that extends substantially parallel to. That is,
The support shaft 55 is erected at a position close to the front wall 38 of the cartridge body 32, and the pivot support 26 provided on the base end side of the linear arm 23 is pivotally supported at a position close to the front wall 38. It will be in a state of being

Further, the elastic piece 24 extending in the direction of the one side wall 40 of the cartridge main body 32 has its tip side abutted against the pressing support portion 56 provided in the vicinity of the one side wall 40. The pressing support portion 56 is integrally formed so as to be erected on the inner surface of the lower half 37, and has a contact surface 56a with which the protruding portion 24a formed on the distal end side of the elastic piece 24 and having an arc shape abuts. It has a smooth surface. By thus forming the contact surface 56a as a smooth surface, the smooth movement of the protrusion 24a that moves on the contact surface 56a following the elastic displacement of the elastic piece 24 is ensured, and the elastic piece 24 moves smoothly. It guarantees bending deformation.

When the tip end side of the elastic piece 24 is brought into contact with the pressing support portion 56, the shutter lock arm portion 23 is held at the position extended along the front wall 38, and the tip end side pressing portion is pressed. A bulging portion 28 having the operation portion 27 formed on one side surface is projected into a notch hole 57 formed by cutting out a part of the front wall 40. At this time, a part of the locking recess 22 formed on one side of the arm portion 23 is also exposed to the cutout hole 57.

A ridge 58 is provided on the inner surface of the front wall 40, and one side of the arm 23 is supported by the ridge 58, so that the bulge 28 is cut out. Hole 5
The amount of protrusion into 7 is regulated. Also, the arm portion 23
When one side is supported by the protrusion 58 in a substantially linear contact, the close contact with the front wall 38 is prevented, and when the shutter opening operation member provided on the disk recording and / or reproducing apparatus side is pressed. In addition, it is possible to smoothly rotate around the pivot portion 26.

As described above, when the shutter member 34 held by the shutter lock member 21 mounted in the cartridge body 32 is moved to the position where the opening 33 is closed as shown in FIG. Engaging piece 60 serving as an engaging portion that engages with the recess 22 for locking provided in the member 21.
Is provided. The engagement piece 60 has a slide guide portion 6 on the side where the shutter opening operation pin engagement hole 61 is formed.
2 is formed by cutting and raising a part of the side edge of the inner side edge. Further, the shutter opening operation pin engaging hole 61 is formed from the rising piece 52b of the slide guide portion 52 to the base end portion of the shutter portion 51. The shutter opening operation pin engagement hole 61 is engaged with the shutter opening operation pin of the shutter opening operation mechanism disposed on the side of the disc recording and / or reproducing apparatus when the disc cartridge is mounted on the apparatus.

The shutter member 34 is provided with an opening 33 for recording and / or reproducing provided in the cartridge body 32.
When the shutter lock member 21 is moved to the closed position, as shown in FIGS. 3 and 4, the engagement piece 60 faces the cutout hole 57 formed in the cartridge body 32.
Is engaged with the locking recess 22 and is held at the position where the opening 33 is closed.

The shutter member 34 for opening and closing the opening 33 is constantly biased by a torsion coil spring 35 provided in the cartridge body 32 so as to close the opening 33. This torsion coil spring 35 is shown in FIG.
As shown in, the first arm portion 66 engaged with the shutter member 34 is extended from one end side of the coil portion 65 in which the wire is wound in a tubular shape, and the other end side of the coil portion 65 is connected to the cartridge main body 32. The second arm portion 67 supported by a part is extended. An engaging portion 68 for the shutter member 34 is formed on the tip end side of the first arm portion 66. As shown in FIG. 7, this locking portion 68 is formed by bending a middle portion of the front end side of the first arm portion 66 into a U-shape. That is, the rising portion on the tip side of the U-shaped bent portion is used as the locking portion 68. A curved support portion 70 that is supported by a spring support portion 69 that is provided in the cartridge body 32 and has a recessed shape is formed on the tip end side of the second arm portion 67. As shown in FIG. 9, the curved support portion 70 is curved and formed outward on the side opposite to the side on which the first and second arm portions 66 and 67 are elastically displaced in the direction in which they approach each other. .

Torsion coil spring 3 formed as described above
As shown in FIG. 6, the reference numeral 5 is provided in the area of the other corner portion on the front surface side that faces the side where the shutter lock member 21 is provided in the cartridge main body 32. The area of this corner portion is similar to the one corner portion where the shutter lock member is arranged, and the front wall 32 that constitutes the outer peripheral side wall of the cartridge main body 32, the other side wall 41 orthogonal to the front wall 32, and the disc. It is surrounded by the rising peripheral wall 43 that constitutes the storage portion 42. And the torsion coil spring 3
5, the locking portion 68 of the first arm portion 66 is locked in the locking groove 71 formed in the shutter member 34, and the second arm 6 is locked.
The curved support portion 70 of No. 7 is attached by being supported by a spring support portion 69 provided in the cartridge body 32. At this time, the coil member 65 is located inside the cartridge body 32 on the side of the rising peripheral wall 43.

By the way, the engaging groove 71 into which the engaging portion 68 provided on the tip end side of the first arm portion 66 is engaged is provided with the engaging piece 6
It is formed on the other side of the slide guide portion 52 that faces one side on which 0 is provided, and is formed by cutting out the side edge on the tip end side of the holding piece 52b that constitutes the slide guide portion 52. . Further, as shown in FIG. 6, the spring support portion 69 is formed at a position close to the abutting position between the front wall 32 of the cartridge body 32 and the other side wall 41 orthogonal to the front wall 32. This spring support 69
8, the curved surface 69a corresponding to the curved surface 70a on the outer peripheral side of the curved support portion 70 is formed on the inner peripheral side, and the side on which the second arm portion 67 is extended is opened substantially in half. It is formed in a circular shape. Then, the spring support portion 69 has the curved surface 6
The curved support portion 70 formed at the tip of the second arm portion 67 is supported by 9a so as to be included therein. In this way, the curved outer peripheral surface of the curved support portion 70 is the spring support portion 69.
When the first and second arm portions 66, 67 are elastically displaced in a direction in which they approach each other, the curved support portion 70 supported so as to be included in the spring support portion 69 is curvedly formed. Since the curved surface 70a on the outer peripheral side is displaced while slidingly contacting the inner peripheral surface of the spring supporting portion 69,
Also, the second arms 66 and 67 can be stably elastically displaced. In addition, the first and second arms 66, 67
It is also possible to increase the movement stroke of. Therefore, a stable elastic displacement of the torsion coil spring 35 is guaranteed.

The torsion coil spring 35 has a locking groove 71 formed in the shutter member 34 and the cartridge body 32.
The first and second arm portions 66 and 67 are elastically displaced in a direction in which the tip ends of the first and second arm portions 66 and 67 are brought closer to each other when the first and second arm portions 66 and 67 are disposed between the spring support portions 69 provided in the. The shutter member 34 has the first and second arm portions 66, 67.
In response to the urging force in the open leg direction, the moving urging force is applied in the direction of closing the opening 33 in the direction of arrow D in FIG.

Further, the first and second arm portions 66, 67 of the torsion coil spring 35 used in the disc cartridge according to the present invention have different lengths. The torsion coil spring 35, as shown in FIG.
5, the spring support portion 69 of the cartridge body 32 from the center O
Than the length L ₁ extending to the curved support portion 70 which is supported, a length L ₂ which reach the locking portion 68 is locked to the locking groove 71 of the shutter member 32 from the center O of the coil part 65, Formed long. That is, the length L _{1 of} the second arm portion 67 is formed longer than the length L ₂ of the first arm portion 66. By forming the torsion coil spring 35 in this manner, the length of the second arm portion 67, which is the fixed end side to the cartridge body 32, is the first side, which is the movable side supported by the side of the shutter member 34 that is displaced. Since it is longer than the arm portion 66 of the first arm portion 66, when the first and second arm portions 66, 67 have the same thickness and the spring constant is common, the long second arm portion 67 is fixed. Cartridge main body 3
The force of the first arm 6 with respect to the shutter member 34 becomes larger than the force of the second with respect to the spring support 69. As a result, the first arm portion 66 can urge the shutter member 34 to move in a direction to close the opening 33 with a large force.

By disposing the torsion coil spring 35 in the cartridge body 32 as described above, the shutter member 34 movably attached to the cartridge body 32.
Receives the biasing force of the torsion coil spring 35 and is indicated by an arrow D in FIG.
In this direction, the opening 33 in the direction is always moved and biased in the direction to close the opening 33. The shutter member 3 moved to a position where the opening 33 is closed by receiving the biasing force of the torsion coil spring 35.
5 is configured to be held at the opening closed position by engaging the engagement piece 60 with the locking recess 22 of the shutter lock member 21.

The shutter member 34 includes a torsion coil spring 35.
Is constantly urged to move in the direction of closing the opening 33,
Moreover, since the engagement piece 60 is engaged with the shutter lock member 21 when it is moved to the position where the opening 33 is closed, the opening 33 can be surely closed. Also,
Even if a shock or the like is applied to the disk cartridge or the shutter member 34 is accidentally moved in the direction of the arrow C in FIG. 4 for opening the opening 33, the opening 33 is immediately closed by the biasing force of the torsion coil spring 34. Since it is moved in the direction of the arrow and is held by the shutter lock member 21, the opening 33 can be surely closed.

As described above, the shutter member 34, which is constantly urged in the direction to close the opening 33 by the torsion coil spring 35 and held at the opening closed position by the shutter lock member 21, is used for recording a disk on a disk cartridge and for recording a disk. When the disc cartridge is mounted on the cartridge mounting position in the disc recording and / or reproducing device by moving the disc cartridge in the disc recording and / or reproducing device, the opening portion 33 is completely opened. Open.

Therefore, an operation state in which the disc cartridge is mounted on the disc recording and / or reproducing apparatus to open the opening 33 will be described.

The disc cartridge has a shutter member 3.
4 is inserted into the disc recording and / or reproducing apparatus with the front side of the moving cartridge body 32 as the insertion end. Incidentally, as shown in FIG. 3, on the upper surface side of the cartridge main body 32, an insertion direction display portion 72 showing the insertion direction of the disk cartridge into the disk recording and / or reproducing apparatus.
Is provided.

When the disc cartridge is inserted into the disc recording and / or reproducing apparatus, a shutter opening operation pin is set up on the tip side of a shutter opening operation arm 73 which constitutes a shutter opening operation mechanism provided on the apparatus side. 7
4 enters the shutter opening operation pin engagement hole 61 formed in the shutter member 34. Then, as shown in FIG. 9, the shutter opening operation pin 74 is exposed in the notch hole 57 formed in the cartridge body 32 located corresponding to the shutter opening operation pin engagement hole 61.
The pressing operation portion 27 formed on the first bulge portion 28 is pressed. When the pressing operation portion 27 is pressed by the shutter opening operation pin 74, the arm portion 23 of the shutter lock member 21 is centered on the pivot support portion 26 pivotally supported by the support shaft 55, and is a cartridge in the direction of arrow E in FIG. It is rotated inward of the main body 32.

When the arm portion 23 of the shutter lock member 21 is rotated inwardly of the cartridge main body 32 in the direction of arrow E in FIG. 9, the elastic piece 24 abuts the projection 24a on the tip side of the pressing support portion 56. It is flexibly deformed so as to be curved while sliding on the contact surface 56a. By elastically deforming the elastic piece 24, an elastic restoring force is applied to the elastic piece 24. The elastic piece 24 is used for the arm portion 2 for shutter lock.
When the pressing of the shutter opening operation pin 74 of No. 3 is released, the arm portion 23 is rotated in the initial position direction of the arrow F direction in FIG.

When the shutter lock arm portion 23 is rotated inwardly of the cartridge main body 32 in the direction of arrow E in FIG. 9, the engagement piece 60 provided on the shutter member 34 is provided with the engagement portion 60 provided on the arm portion 23. The engagement with the stop recess 22 is released, and the shutter member 34 becomes movable.

The shutter lock member 2 of the shutter member 34
When the disc cartridge is further inserted into the disc recording and / or reproducing apparatus from the state shown in FIG. 10 where the engagement with No. 1 is released, the shutter member 34 engages with the shutter opening operation pin engagement hole 61. The shutter opening operation pin 74 is pressed to operate the torsion coil spring 35.
9 is moved in the direction of opening the opening 33 in the direction of arrow C in FIG. The pressing operation position of the shutter member 34 by the shutter opening operation pin 74 is the surface of the shutter opening operation pin engaging hole 61 opposite to the side on which the engaging piece 60 is provided.

When the shutter opening operation pin 74 is pressed to move the shutter member 34 in the direction to open the opening 33, the pressing of the arm portion 23 by the shutter opening operation pin 74 is released. And the arm portion 23
Receives the elastic restoring force of the elastic piece 24 that has been curved and displaced,
The bulging portion 2 is rotated in the initial position direction of the arrow F in FIG.
It is rotated and returned to the initial position facing 8.

When the shutter member 34 is moved in the direction to open the opening 33, the first and second arm portions 66 and 67 of the torsion coil spring 35 are closed so that their leading ends are brought close to each other. It is elastically displaced in the arrow G direction and the arrow H direction. At this time, in the torsion coil spring 35, the first arm portion 66 has the first arm portion 66 as the fulcrum with the curved support portion 70 provided on the distal end side of the second arm portion 67 supported by the spring support portion 70 provided in the cartridge body 32 as a fulcrum. The second arm portion 67 is displaced toward the arm portion 67 side. When the first arm portion 66 is displaced toward the second arm portion 67 side, the curved support portion 70 formed at the tip of the second arm portion 67 moves the curved outer peripheral surface. Spring support 6
It is rotationally displaced while slidingly contacting the inner peripheral surface of 9. Since the curved outer peripheral surface of the curved support portion 70 on the fixed end side is supported by the spring support portion 69 so as to be inward, the curved support portion 70 bends following the elastic displacement of the first and second arm portions 66, 67. The support portion 70 is rotationally displaced, and smooth elastic displacement of the first and second arm portions 66 and 67 is realized.

At this time, the coil portion 65 of the torsion coil spring 35 is moved toward the other side wall 41 of the cartridge body 32 in the direction of arrow I in FIG. That is, the coil portion 65 moves so as to enter the space formed between the side wall 41 and the rising peripheral wall 43. As a result, the torsion coil spring 35 is elastically displaced by effectively utilizing the narrow space formed on the other corner side of the cartridge body 32.

When the disc cartridge is mounted up to the cartridge mounting position in the disc recording and / or reproducing apparatus, the shutter member 34 is moved to the position shown in FIGS.
As shown in FIG. 3, the opening 33 is moved to a position where the opening 33 is completely opened. When the disc cartridge is mounted in the disc recording and / or reproducing apparatus, the shutter member 34 is supported by the shutter opening operation pin 74 as shown in FIG. 11, and resists the biasing force of the torsion coil spring 35. It is supported at a position where the opening 33 is completely opened.

When the disc cartridge mounted at the cartridge mounting position is ejected, the shutter opening operation pin 74 releases the support of the shutter member 34, and the shutter member 34 receives the biasing force of the torsion coil spring 35 to open the opening 33. Is moved in the direction to close the.
Then, when the disc cartridge is ejected from the disc recording and / or reproducing apparatus, the shutter member 34 is opened.
3 is moved to a position where it is completely closed, and the engaging piece 60 is provided with the locking recess 22 provided in the shutter locking arm 23.
Relative to. As a result, the shutter member 34 is held in the opening closed position by the shutter lock member 21.

It should be noted that the engagement piece 60 is located above the pressing operation portion 27 of the bulging portion 28 formed in the shutter lock arm portion 23 which is rotationally returned to the initial position by receiving the elastic return force of the elastic piece 24. While slidingly contacting with each other, the engaging recess 22 is relatively engaged.

By the way, on the outer surface of the cartridge body 32, a shutter moving concave portion 75 is formed in a concave shape over the range in which the shutter member 34 moves. The shutter moving concave portion 75 is formed over a range including the peripheral edge of the opening 33 and in which the shutter member 34 moves to the position where the opening 33 is opened. The shutter moving concave portion 75 is formed in the shutter member 34 to a depth substantially equal to the thickness, so that the outer surface of the cartridge body 32 of the shutter portion 51 does not project.

Further, along the inner side edge of the shutter moving concave portion 75, a restraining plate 76 for supporting a support piece 51a formed by bending the tip of the shutter portion 51 in a stepwise manner is attached. In the shutter portion 51, the support piece 51 a is supported by the holding plate 76, so that the cartridge body 3
2 is prevented from being lifted, swinging when moving in the direction of opening and closing the opening 33 is restricted, and smooth movement is possible.

Further, when the disc cartridge is mounted on the disc recording and / or reproducing apparatus, the disc 31 is mounted on the inner surface side of the upper half 36 constituting the cartridge main body 32 so as to rotate the disc 31 on this side. A clamper 81 for clamping is attached to the disc table of the mechanism. As shown in FIG. 13, the clamper 81 is provided for the disc 3 stored in the disc storage portion 42.
The upper half 36 is located at the center of the upper half 36 so as to face the first center hole 31a.

The clamper 81 is attached to the upper half 36 so as to be rotatable and movable in the axial direction, and is loosely fitted in a circular hole 82 formed in the central portion of the upper half 36. It is arranged. That is, the clamper 81
13, the peripheral edge of the clamper yoke 84 made of a magnetic material such as a metal plate is supported by the locking projection 83 provided on the inner peripheral edge of the circular hole 82 to close the circular hole 82. By being supported by the fall prevention plate 85 arranged on the outer surface side of the cartridge body 32, the cartridge is attached while being prevented from coming off from the upper half 36.

The drop-out prevention plate 85 is fitted and disposed in a fitting recess 87 formed in the peripheral edge of the circular hole 82, and is stuck to the label sticking portion 86 formed on the outer surface of the cartridge body 32. Since the entire surface is covered with the label 88 on which the contents such as the title recorded on the disc 31 are printed, the label 88 is attached while being prevented from coming off from the cartridge body 32.

Label 8 which covers and supports the fall-off prevention plate 84.
No adhesive agent is applied to at least the portion of 8 facing the drop prevention plate 85. That is, the fall prevention plate 85 is
By being supported by the label 88 that is attached only by the label attaching portion 86, the movable portion can be freely moved within the fitting recess 87.

By mounting the clamper 81 on the cartridge body 32 side in this way, it is not necessary to provide a hub for the clamper on the disk 31, and the manufacture of the disk 31 becomes extremely easy.

Disc 3 housed in a disc cartridge having a clamper 81 attached to the cartridge body 32 side.
The mounting state of No. 1 on the disk rotation drive mechanism will be described.

When the disc cartridge is mounted at the cartridge mounting position in the disc recording and / or reproducing apparatus, the opening 33 is opened as described above, and as shown in FIG. 13, the disc table enters the opening 33. Part 3
The disk table 91 of the disk rotation driving mechanism arranged on the apparatus side enters into the cartridge main body 32 via 3a, and the disk 31 is placed on the disk table 91. At this time, the disc 31 is centered with respect to the disc table 91 by fitting the center hole 31a into the centering member 92 provided at the center of the disc table 91.

When the disc 31 is placed on the disc table 91, the clamper yoke 83 is attracted by the magnet 93 provided on the disc table 91 side, and the clamper 81 is pressed against the disc 31. And disk 3
1 is sandwiched between the disc table 91 and the clamper 81, integrated with the disc table 91, and in a state in which it can be rotationally driven in synchronization with the disc table 91.

The disc cartridge according to the present invention is designed to prevent an erroneous insertion direction with respect to the disc recording and / or reproducing device, and therefore, as shown in FIG. The pair of side walls 40 and 41 orthogonal to the front wall 38 are different in shape. One side wall 40 is a flat surface having a side surface perpendicular to the main surface, and the other side wall 41.
Is formed in a shape in which the cross section bulges in a semicircular shape.

Further, in order to prevent an erroneous insertion direction, the cartridge main body 32 has a different shape in the left and right directions with respect to the insertion direction with respect to the disk recording and / or reproducing apparatus. That is, the corner portion of the cartridge main body 32 on the side where the shutter lock member 21 is arranged is formed with a larger arc than the other corner portions, and this corner portion serves as an erroneous insertion prevention portion 95.

Furthermore, on the lower half 37 side of the cartridge body 32, there is a positioning pin for positioning the mounting position when the disc cartridge is mounted in the cartridge mounting portion in the disc recording and / or reproducing apparatus. A pair of positioning holes 96 and 97 that engage with each other are provided. Further, one side wall 40 side of the cartridge main body 32 is provided with a loading mechanism which is engaged with a loading mechanism arranged on the side of the disc recording and / or reproducing apparatus when the disc cartridge is loaded into the apparatus. An engagement recess 98 is formed.

[0074]

As described above, in the disk cartridge according to the present invention, the cartridge of the other arm portion from the center of the coil portion of the torsion coil spring that biases the shutter member attached to the cartridge body in the direction of closing the opening portion. Since the length to the supporting end for the main body is longer than the length from the center of the coil portion to the locking end of one arm portion to the shutter member, the fixed end side of the other long arm portion The force applied to the shutter member can be increased via the one arm that is shorter in length than the force applied to the shutter member, so the shutter member can be reliably moved in the position direction in which the opening is closed with a small torsion coil spring. Can be biased. As a result, the opening can be reliably closed by the shutter member, and the disc-shaped recording medium in the cartridge body can be reliably protected.

In the torsion coil spring, since the curved surface on the outer peripheral surface side of the curved support portion formed on the tip end side of the other arm portion is supported by a part of the cartridge body, the torsion coil spring is fixed to the cartridge body side. It is not necessary to provide a shaft for doing so, and the formation becomes easy when the cartridge body is formed by molding a synthetic resin material.

Further, in the torsion coil spring, since the curved surface on the outer peripheral surface side of the curved support portion is supported by the cartridge main body, smooth opening and closing of the pair of arm portions can be realized.

[Brief description of drawings]

FIG. 1 is a perspective view of a disc cartridge according to the present invention as viewed from the top side.

FIG. 2 is a perspective view of the disc cartridge according to the present invention as viewed from the lower surface side.

FIG. 3 is an exploded perspective view of a disc cartridge according to the present invention.

FIG. 4 is a plan view showing an internal configuration of the disc cartridge showing a mounting state of a shutter lock member and a torsion coil spring which constitute the disc cartridge according to the present invention.

FIG. 5 is a perspective view showing a shutter lock member according to the present invention.

FIG. 6 is a plan view showing an extension direction of an elastic piece constituting a shutter lock member according to the present invention with respect to an arm portion for shutter lock.

FIG. 7 is a perspective view showing a torsion coil spring used in the disc cartridge according to the present invention.

FIG. 8 is an enlarged plan view showing how the torsion coil spring is attached to the cartridge body.

FIG. 9 is a plan view showing an internal configuration of the disc cartridge showing a state in which the shutter lock member is pressed by a shutter opening operation mechanism provided on the disc recording and / or reproducing device side.

FIG. 10 is a partial plan view showing a state in which the shutter opening operation mechanism has moved the shutter member in a direction to open the opening.

FIG. 11 is a partial plan view showing a state where the shutter opening operation mechanism moves the shutter member to a position where the opening is opened.

FIG. 12 is a perspective view of the disc cartridge according to the present invention showing a state in which an opening for recording and / or reproducing is opened, as seen from the lower surface side.

FIG. 13 is a cross-sectional view showing a state in which the disc cartridge according to the present invention is mounted in the disc recording and / or reproducing apparatus, and the disc is mounted on the disc table.

FIG. 14 is a front view of a disk cartridge according to the present invention.

[Explanation of symbols]

21 shutter lock member 22 locking recess 23 shutter lock arm 24 elastic piece 26 pivotal support 32 cartridge body 33 recording and / or reproducing opening 34 provided in the cartridge body 34 shutter member 35 torsion coil spring 60 for shutter member Provided engagement piece 66 First arm portion of torsion coil spring 67 Second arm portion of torsion coil spring 68 Engagement portion 69 Spring support portion provided in cartridge body 70 Curved support portion

Claims (2)

[Claims] 1. A recording and / or reproducing opening for rotatably accommodating a disk-shaped recording medium and exposing at least a part of a signal recording area of the disk-shaped recording medium to the outside over the inner and outer circumferences. A cartridge body having a portion formed therein, a shutter member that is movably mounted along one side surface of the cartridge body and that opens and closes a recording and / or reproducing opening formed in the cartridge body, and extends from a coil portion. The one end of the one arm part is locked to the shutter member, and the other arm part extended from the coil part is supported in a part of the cartridge body and disposed in the cartridge body. And a torsion coil spring for urging the shutter member in a direction to close the opening, the torsion coil spring including the torsion coil spring from the center of the coil portion. A disc cartridge, wherein a length of a cam portion reaching a supporting end for a cartridge body is longer than a length of a length from a center of the coil portion to a locking end of the one arm portion to the shutter member. 2. The torsion coil spring is provided on the tip side of the other arm portion supported by a part of the cartridge body,
2. The disk cartridge according to claim 1, wherein a curved support portion having an outer peripheral surface side supported by the cartridge body and having a curved surface is formed.