JP3688545B2 - Disk drive - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disk drive device used in a recording / reproducing apparatus for recording information on a recording medium such as a magneto-optical disk or an optical disk and / or reproducing the recorded information.
[0002]
[Prior art]
Conventionally, a recording and / or reproducing apparatus configured to record and / or reproduce an information signal using a recording medium such as a magneto-optical disk or an optical disk has been proposed. As the recording medium, there has been proposed a recording medium configured as a disk cartridge in which the magneto-optical disk or optical disk is housed in a cartridge. The recording and / or reproducing apparatus includes an optical pick and a magnetic head for writing and / or reading information signals on the recording medium.
[0003]
These are widely used as an optical disc device used for an audio disc, a video disc, or a data storage device of a computer. Among such devices, an MD (mini disc) device using a small-diameter disc has been reduced in size as an audio disc device, and is widely used as a device suitable for carrying. Not only audio / video (AV) equipment such as MD, but also personal computers are rapidly becoming smaller and more portable, and further downsizing and thinning of optical disk devices are desired. In response to these demands, there have been proposals for disks that have a smaller diameter and a larger capacity by improving the recording density of the disk.
[0004]
[Problems to be solved by the invention]
However, as the diameter of the disk decreases, the size and thickness of the transfer means such as the optical pick, the disk rotation drive motor, the optical pick transfer motor, and the transfer mechanism that make up the disk drive device is an obstacle to making the device smaller and thinner. It becomes. In order to improve the recording density, it is necessary to shorten the recording track width of the disk and the shortest recording wavelength. To achieve this, the optical pick, the disk rotation drive motor, and the optical pick transport means must be of higher accuracy. Necessary. If these are easily reduced in size and thickness according to the diameter of the disk, there is a problem that sufficient accuracy and reliability cannot be secured, leading to malfunctions in recording and reproduction.
[0005]
SUMMARY OF THE INVENTION The present invention solves the above-described problems, and aims to reduce the size and thickness of a disk drive device with a simple configuration and to improve the assembly workability while ensuring the accuracy and reliability of the device. It is said.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the disk drive device of the present invention is a disk drive device in which a disk cartridge having a circular portion protruding in a substantially arc shape on a part of one side in a substantially rectangular shape can be mounted. When holding the lead screw integrally formed with the optical pick transfer motor and its rotation main shaft between the vicinity of the transfer motor and the tip of the lead screw, the two holding portions are sandwiched between the circular portions of the disk cartridge. Deploy. As a result, even in an apparatus using a disk having a smaller diameter, the entire apparatus can be reduced in size and thickness without forcing the optical pick to be reduced in size and thickness. In the above, it is preferable that the two holding portions are arranged close to the circular portion. Further, it is preferable to arrange the rotation main shaft and lead screw of the transfer motor so that the circular portion of the disk cartridge overlaps in the thickness direction.
[0007]
More specifically, the present invention has the following configuration.
[0008]
The disk drive device according to the first configuration of the present invention rotatably stores a disk for recording and / or reproducing information, has a substantially rectangular planar shape, and protrudes in a substantially arc shape on a part of one side. A disk drive device capable of mounting a disk cartridge having a circular portion, a spindle motor for rotationally driving the disk, an optical pick for recording and / or reproducing information on the disk, and the optical pick A transfer motor for transferring the disk in the radial direction of the disk, a lead screw formed integrally with a rotation main shaft of the transfer motor, a feeding engagement member attached to the optical pick and meshing with the lead screw, A frame attached to the transfer motor and bent into a substantially “U” shape that pivotally supports the tip of the lead screw. It was the open side, with is facing the circular portion of the disc cartridge, that both distal end portion of the frame is arranged so as to sandwich the circular portion and arranged the lead screw immediately below the lower surface of the circular portion Features.
[0009]
According to the first configuration, the amount of protrusion of the transfer mechanism portion in the cartridge insertion direction (circular portion side) can be minimized, and the lead screw can be arranged with a slight gap from the lower surface of the cartridge. Small and thin. Furthermore, since the width of the frame in the disk normal direction can be increased, the rigidity of the frame can be increased and the reliability can be improved. Further, since a high-precision optical system and objective lens actuator mechanism can be mounted on the optical pick, it is possible to achieve both miniaturization of the apparatus and high precision.
[0010]
Said 1st structure WHEREIN: It is preferable that the said meshing member for sending protrudes in the direction approaching the said transfer motor from the said optical pick, and is attached. According to this configuration, the size of the frame in the longitudinal direction (in the direction of the rotation main shaft of the transfer motor) can be reduced, and the length of the rotation main shaft on which the lead screw is formed can be shortened, so that the rigidity of the frame and the rotation main shaft can be increased. The reliability of the device can be increased. Further, since the mass of the rotating spindle can be reduced, the inertia is reduced, and the optical pick can be accelerated and decelerated at a higher speed.
[0011]
Also, the disk drive device according to the second configuration of the present invention rotatably stores a disk for recording and / or reproducing information, has a substantially rectangular planar shape, and a substantially arc shape on a part of one side. A disk drive device capable of mounting a disk cartridge having a protruding circular portion, the spindle motor rotating the disk, an optical pick for recording and / or reproducing information on the disk, A transfer motor for transferring the optical pick in the radial direction of the disk, a chassis on which the disk cartridge is mounted at a predetermined position and the spindle motor and the transfer motor are mounted, and the transfer motor is attached to the chassis The transfer motor main body fixing part to be fixed, the lead screw formed integrally with the rotation main shaft of the transfer motor, and the optical pick And a feed engagement member that meshes with the lead screw, and a lead screw support member that pivotally supports a tip end portion of the lead screw on the chassis, wherein the transfer motor main body fixing portion and the lead screw support member include: The transfer motor main body fixing portion and the lead screw support member are disposed so as to sandwich the circular portion of the disk cartridge, and the lead screw is disposed immediately below the lower surface of the circular portion .
[0012]
According to the second configuration, the amount of protrusion of the transfer mechanism portion in the cartridge insertion direction (circular portion side) can be minimized, and the lead screw can be arranged with a slight gap from the lower surface of the cartridge. Small and thin. Furthermore, since the chassis is used instead of the frame, the lead screw can be held with high rigidity, and the reliability can be improved. In addition, a configuration that does not use a frame leads to weight reduction and low cost of the apparatus. Further, since a high-precision optical system and objective lens actuator mechanism can be mounted on the optical pick, it is possible to achieve both miniaturization of the apparatus and high precision.
[0013]
In the first and second configurations, a tooth portion that meshes with the lead screw of the feeding engagement member is biased in a direction of pressing the lead screw, and is substantially orthogonal to the pressing direction of the tooth portion. It is preferable that an inclined portion is formed at at least one end in the direction. By biasing the teeth of the feeding meshing member in the direction in which the lead screw is pressed, backlash does not occur even when the lead screw rotates forward and backward, and the optical pick can be accurately transferred. In addition, by forming an inclined portion on at least one of both end portions of the tooth portion in a direction substantially orthogonal to the pressing direction, the above-described attachment is performed without deteriorating workability during assembly and without causing damage to the component. It is possible to easily assemble the meshing structure to which power is applied.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
[0015]
(Embodiment 1)
FIG. 1 is a perspective view of a disk drive device according to a first embodiment of the present invention as viewed from the upper surface side, and FIG. 2 is a perspective view of the disk drive device according to the first embodiment as viewed from the upper surface side. FIG. 3 is an enlarged plan view showing a part of the disk drive device according to the first embodiment, and FIG. 4 is an exploded view showing a schematic configuration of the optical pick transfer mechanism of the disk drive device according to the first embodiment. FIG. 5 is a bottom view of the disk drive device according to the first embodiment, FIG. 6 is a perspective view showing a feeding engagement member of the disk drive device according to the first embodiment, and FIG. It is a front view showing the meshing (screwing) state of the feeding meshing member and the lead screw of the disk drive device. FIG. 8 is a perspective view showing a disk cartridge used in the disk drive device of the present invention.
[0016]
As shown in FIG. 8, the cartridge 1 used in the disk drive apparatus of the present invention accommodates the disk 2 in a rotatable manner. An opening through which the optical pick 12 faces is formed on one surface of the cartridge 1, and an opening (not shown) through which the spindle motor 15 and the magnetic head face is formed on the other surface. The planar shape of the cartridge 1 is substantially rectangular, and a circular portion 3 protruding in an arc shape is formed on a part of the front end side in the insertion direction Y to the disk drive device. The center of the circular arc of the circular portion 3 substantially coincides with the center of rotation of the disc 2 accommodated therein, and the radius of the arc is the minimum size necessary for the rotation of the disc 2 contained therein. A shutter 4 is slidably mounted along a side parallel to the insertion direction Y. The shutter 4 exposes an opening as shown in FIG. 8 when the cartridge 1 is placed on the disk drive device of the present invention (see FIG. 2), and closes the opening when the cartridge 1 is removed from the disk drive device.
[0017]
As shown in FIGS. 1 to 5, the planar shape of the chassis 16 is a substantially rectangular shape having substantially the same size as the smallest rectangle including the planar shape of the cartridge 1. A spindle motor 15 is fixed to the center of the chassis 16. The spindle motor 15 rotates the disk 2 built in the cartridge 1.
[0018]
The optical pick 12 is held movably on the inner and outer circumferences of the disk 2 along guide shafts 17 and 18 fixed to the chassis 16 in order to write and / or read information signals to and from the disk 2. Both ends of the guide shafts 17 and 18 are equipped with a mechanism (not shown) for adjusting the position only in the rotation axis direction (height direction) of the spindle motor 15. By using this position adjusting mechanism, the optical pick 12 can be slightly tilted, thereby correcting the tilt of the optical axis of the optical pick 12 due to manufacturing variations of the spindle motor 15 and the optical pick 12 with respect to the reflecting surface of the disk 2. be able to.
[0019]
The optical pick 12 is transferred over the inner and outer circumferences of the disk 2 by the transfer stepping motor 5. A lead screw 6 is integrally formed on the rotation main shaft of the transfer stepping motor 5. The leading end of the lead screw 6 is rotatably held by a leading end 9 of a frame 7 bent in a “U” shape, and the other leading end 8 of the frame 7 is welded to the main body of the transfer stepping motor 5. It is fixed by. The frame 7 is formed with a bent portion 10 for coupling with the chassis 16, so that the opening side of the “U” -shaped frame 7 faces the circular portion 3 of the cartridge 1, and the front end portion 8 of the frame 7. , 9 are fixed from the back side of the chassis 16 using screws 11 so that the circular portion 3 is sandwiched therebetween. The gap between the front end side surface of the circular portion 3 of the cartridge 1 in the insertion direction and the frame 7 is configured to be minimal within a range where the cartridge 1 does not come into contact with each other when the cartridge 1 is attached or detached.
[0020]
A feeding engagement member 19 that engages (screws) with the lead screw 6 is attached to the end of the optical pick 12. As shown in FIG. 6, the feeding engagement member 19 is made of a phosphor bronze sheet metal having spring properties, and is configured to be bent into a substantially L-shaped cross section. One plate-like portion of the bent portion forms a base 19b, and the other plate-like elastic portion 19c is connected to the base 19b only at one end. At the tip of the free end of the plate-like elastic portion 19c supported in a cantilever manner, a tooth portion 19a having the same inclination as the lead angle of the lead screw is formed by bending the sheet metal into a V shape. The tooth portion 19a is spring-biased in the direction in which the lead screw 6 is pressed by the elastic force of the plate-like elastic portion 19c. As a result, the meshing (screwing) by the feeding meshing member 19 does not generate backlash due to the forward / reverse rotation of the lead screw, and the optical pick 12 can be accurately transferred. The base 19b of the feeding engagement member 19 is fixed to the optical pick 12, and a plate-like elastic portion 19c including the tooth portion 19a is inserted between the lead screw 6 and the frame 7 as shown in FIG. Since the plate-like elastic portion 19c is arranged in parallel to the height direction (the rotation axis direction of the spindle motor 15), the lead screw of the feeding engagement member 19 is adjusted even if the height of the guide shafts 17 and 18 is adjusted. The spring biasing force on 6 does not change, and a stable meshing (screwing) state is maintained.
[0021]
An inclined portion (C surface, chamfering) 21 is formed at the upper end portion of the tooth portion 19a of the feeding engagement member 19 so that the side where the lead screw 6 is located is lowered. The function of the inclined portion 21 will be described with reference to FIG. FIG. 7 is a front view of the meshing (screwing) state of the feeding meshing member 19 and the lead screw 6 as viewed from the direction of the rotation axis of the lead screw 6. A solid line indicates a state when the assembly is completed, and the tooth portion 19a of the feeding engagement member 19 is engaged (screwed) with the lead screw 6 from a direction substantially perpendicular to the surface of the disk 2. When the lead screw 6 and the feeding engagement member 19 are not engaged with each other during the assembly process of the drive device, that is, when the lead screw is at the position 6 ′ indicated by the two-dot chain line, the tooth portion is indicated by the two-dot chain line. At position 19a ′. From this state, the lead screw is moved to the position 6 in a direction substantially normal to the disk surface and engaged (screwed). At the position 6 ″, the lead screw contacts the inclined portion 21 on the upper surface of the feeding engagement member 19. When the pressing force of the lead screw in the downward direction on the paper acts on the inclined portion 21, the plate-like elastic portion 19c is elastically deformed and meshes (screwed) while moving the tooth portion 19a in the right direction on the paper surface. By forming the inclined portion 21 at the upper end portion of the tooth portion 19a in this way, the upper end portion of the tooth portion 19a of the feeding engagement member 19 may damage the lead screw 6 in the assembly process of the drive device. As a result, it is possible to prevent the occurrence of defective assembly such that the feeding engagement member 19 is permanently deformed by the downward pressing force of the lead screw 6. Also, the assembly workability is remarkably improved. That.
[0022]
An angle member 13 for attaching a magnetic head (not shown) is attached to the end of the optical pick 12 by screws 14a and 14b (see FIG. 5). In the figure, the angle 13 is cut halfway, and the illustration of the upper structure is omitted. The magnetic head is integrated with the optical pick and transferred in the radial direction of the disk to perform magnetic field modulation type magneto-optical recording.
[0023]
In this embodiment, since the opening side of the “U” -shaped frame 7 is arranged to face the circular portion 3 of the cartridge 1, the protrusion in the cartridge insertion direction of the transfer mechanism portion is the thickness of the frame 7, Only the sum of the slight gap dimensions between the cartridges. Since the frame 7 and the chassis 16 do not exist between the lead screw 6 and the lower surface of the circular portion 3 of the cartridge 1, the lead screw 6 can be disposed with a slight clearance from the lower surface of the cartridge 1. Since the frame 7 and the cartridge 1 can overlap in the normal direction (height direction) of the disk surface, the width in the height direction of the frame 7 can be increased. Furthermore, since the lead screw 6 for transporting the optical pick 12 is disposed below the circular portion 3 at the front end of the cartridge 1, the effective dimension of the optical pick 12 in the direction perpendicular to the transport direction can be increased, and a highly accurate optical system or It becomes easy to mount the objective lens actuator mechanism.
[0024]
In this embodiment, the feeding engagement member 19 is made of a phosphor bronze sheet metal having spring properties, but it is made of only resin, made of two pieces of resin and sheet metal, or made of composite molding of resin and sheet metal. The same effect can be obtained by doing.
[0025]
Another configuration example of the present embodiment is shown in FIGS. FIG. 9 is an exploded perspective view showing a schematic configuration of an optical pick transfer mechanism of a disk drive device according to another configuration example of the first embodiment, and FIG. 10 shows a state in which a disk cartridge is mounted on the disk drive device as viewed from the upper surface side. FIG. 9 and 10, members having the same functions as those in FIGS. 1 to 8 are denoted by the same reference numerals.
[0026]
As shown in FIGS. 9 and 10, in this configuration example, the feeding meshing member 19 is attached so as to protrude from the optical pick 12 in a direction approaching the transfer stepping motor 5. In order to project the feeding meshing member 19 from the optical pick 12, the feeding meshing member mounting member 20 is screwed to the end of the optical pick 12, and the feeding meshing member 19 is riveted to the tip. The front end portion 9 of the frame 7 is close to the stepping motor 5 side to a position where it does not interfere with the circular portion 3 of the cartridge 1. With such a configuration, the size of the frame 7 in the longitudinal direction can be reduced, and the length of the rotation main shaft on which the lead screw 6 is formed can be shortened.
[0027]
(Embodiment 2)
FIG. 11 is an exploded perspective view showing a schematic configuration of the optical pick transfer mechanism of the disk drive device according to the second embodiment of the present invention, and FIG. 12 shows a state in which the disk cartridge is mounted on the disk drive device according to the second embodiment. It is the perspective view seen from the upper surface side. 11 and 12, members having the same functions as those of the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
[0028]
The present embodiment is different from the first embodiment in that the transfer stepping motor 5 and the lead screw 6 formed on the rotation main shaft thereof are supported without using the “U” -shaped frame 7.
[0029]
That is, the transfer stepping motor 5 is fastened and fixed to the transfer motor main body fixing portion 22 provided integrally with the chassis 16 by the screw 23. The leading end of the lead screw 6 is rotatably held by a lead screw support member 24 fastened and fixed to the chassis 16 by screws 25. The transfer motor main body fixing portion 22 and the lead screw support member 24 sandwich the arc of the circular portion 3 formed in an arc shape at the front end in the insertion direction of the cartridge 1 from both sides and are as close as possible to the start and end of the arc of the circular portion 3 In the position.
[0030]
The feed engagement member 19 that meshes (screws) with the lead screw 6 has the same configuration as that shown in FIG. 6, and is attached to the optical pick 12 via the feed engagement member attachment member 20 by the method shown in FIGS. It is done. Moreover, the assembly method (meshing method) is the same as that of FIG.
[0031]
In the example of FIGS. 11 and 12, the lead screw support member 24 is configured separately from the chassis 16, but may be configured integrally. Moreover, although the transfer motor main body fixing part 22 is configured integrally with the chassis 16, it can also be configured separately.
[0032]
【The invention's effect】
As described above, according to the present invention, even in an apparatus using a smaller-diameter disk, the entire apparatus can be reduced in size and thickness without forcing the optical pick to be reduced in size and thickness. At the same time, high reliability and high accuracy of the device can be realized.
[Brief description of the drawings]
FIG. 1 is a perspective view of a disk drive device according to a first embodiment of the present invention as viewed from the upper surface side.
FIG. 2 is a perspective view of a state in which a disk cartridge is mounted on the disk drive device according to Embodiment 1 of the present invention, as viewed from the upper surface side.
FIG. 3 is an enlarged plan view showing a part of the disk drive device according to the first embodiment of the present invention.
FIG. 4 is an exploded perspective view showing a schematic configuration of an optical pick transfer mechanism of the disk drive device according to the first embodiment of the present invention.
FIG. 5 is a bottom view of the disk drive device according to the first embodiment of the present invention.
FIG. 6 is a perspective view showing a feeding engagement member of the disk drive device according to Embodiment 1 of the present invention.
FIG. 7 is a front view showing a meshing (screwing) state of a feeding meshing member and a lead screw of the disk drive device according to Embodiment 1 of the present invention.
FIG. 8 is a perspective view showing a disk cartridge used in the disk drive device of the present invention.
FIG. 9 is an exploded perspective view showing a schematic configuration of an optical pick transfer mechanism of a disk drive device according to another configuration example of Embodiment 1 of the present invention;
FIG. 10 is a perspective view of a state in which a disk cartridge is mounted on a disk drive device according to another configuration example of Embodiment 1 of the present invention, as viewed from the upper surface side.
FIG. 11 is an exploded perspective view showing a schematic configuration of an optical pick transfer mechanism of a disk drive device according to a second embodiment of the present invention.
FIG. 12 is a perspective view of a state in which a disk cartridge is mounted on a disk drive device according to Embodiment 2 of the present invention, as viewed from the upper surface side.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cartridge 2 Disc 3 Circular part 4 Shutter 5 Transfer stepping motor 6 Lead screw 7 Frame 12 Optical pick 15 Spindle motor 16 Chassis 17, 18 Guide shaft 19 Feeding engagement member 19a Tooth part 21 Inclination part 22 Transfer motor main body fixing part 24 Lead screw support member

Claims (4)

A disk drive device that can store a disk for recording and / or reproducing information in a freely rotatable manner, and can be mounted with a disk cartridge having a substantially rectangular planar shape and a circular portion protruding in a substantially arc shape on a part of one side. There,
A spindle motor for rotating the disk;
An optical pick for recording and / or reproducing information on the disc;
A transfer motor for transferring the optical pick in the radial direction of the disk;
A lead screw formed integrally with the rotation main shaft of the transfer motor;
A feeding engagement member attached to the optical pick and meshing with the lead screw;
A frame attached to the transfer motor and bent into a substantially "U" shape that pivotally supports the tip of the lead screw;
The bent opening side of the frame is opposed to the circular portion of the disk cartridge, the both end portions of the frame are disposed so as to sandwich the circular portion , and the lead screw is disposed immediately below the lower surface of the circular portion. disk drive apparatus characterized by the.   2. The disk drive device according to claim 1, wherein the feeding engagement member protrudes from the optical pick in a direction approaching the transfer motor. 3. A disk drive device that can store a disk for recording and / or reproducing information in a freely rotatable manner and can be mounted with a disk cartridge having a substantially rectangular planar shape and a circular portion protruding in a substantially arc shape on a part of one side. There,
A spindle motor for rotating the disk;
An optical pick for recording and / or reproducing information on the disc;
A transfer motor for transferring the optical pick in the radial direction of the disk;
A chassis on which the disk cartridge is mounted at a predetermined position and the spindle motor and the transfer motor are mounted;
A transfer motor body fixing portion for fixing the transfer motor to the chassis;
A lead screw formed integrally with the rotation main shaft of the transfer motor;
A feeding engagement member attached to the optical pick and meshing with the lead screw;
A lead screw support member that pivotally supports the tip of the lead screw on the chassis;
The transfer motor main body fixing portion and the lead screw support member are arranged so that the transfer motor main body fixing portion and the lead screw support member sandwich the circular portion of the disk cartridge, and the lead screw is directly below the lower surface of the circular portion. A disk drive device characterized by being arranged in   A tooth portion that meshes with the lead screw of the feeding engagement member is biased in a direction in which the lead screw is pressed, and an inclined portion at at least one end portion in a direction substantially orthogonal to the pressing direction of the tooth portion. The disk drive device according to claim 1 or 3, wherein: is formed.

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