KR100548236B1 - High density data recording / playback cartridge - Google Patents

Abstract

The present invention relates to a cartridge that is adapted to a recording medium on which information is recorded and reproduced using a near field.

The high density data recording / reproducing cartridge of the present invention focuses on the recording medium, the optical path forming means for forming the optical transmission path, the light transmitted via the optical transmission path, and the light reflected from the recording medium. A light converging means for guiding the path forming means, a head means for causing the light converging means to float within a small distance from the recording medium, a head driving means for conveying the head means to an arbitrary position on the recording medium, and Recording medium driving means for rotating.

With this configuration, the high density data recording / reproducing cartridge according to the present invention can minimize the optical error generated during recording / reproducing by foreign matter such as dust introduced with the external air by disconnecting the recording medium from the external air. do.

Description

Cartridges for High Density Data Recording / Playback

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cartridge for protecting a recording medium from external pollutants and impact sources, and more particularly, to a cartridge adapted to a recording medium to which information is recorded and reproduced using a near field.

The information recording medium is an optical recording / reproducing phase change type recording medium, and a DVD-RAM having a recording capacity of up to 4.7 GB on a 120 mm diameter disk has been developed and distributed as compared to a CD. ASMO (Advanced Storage Magneto Optical) with recording capacity of 6.1 GB is being developed by adopting the magnetic field modulation recording method. Although the information recording medium has been actively researched to increase the density in response to a large amount of information such as moving images, the recording capacity is satisfactory in the face of the optical and physical limitations caused by the conventional optical recording or magneto-optical recording methods. The level is not reached. For example, a 120-mm diameter single-sided 2.6-GB DVD-RAM, which is currently in practical use, cannot accommodate an image of a resolution corresponding to high-definition television (HD TV) for more than two hours. In addition, the disk drive device for recording / reproducing the recording medium of the optical recording / reproducing method has a problem that the servo control becomes difficult because the vibration and noise become more severe at higher speeds and thus the speed cannot be increased beyond a certain limit.

Conventional optical recording / reproducing or magneto-optical recording / reproducing recording media may have high density recording capacities although the pit (or recording mark) size is small and the track width is narrow. However, there is a limit in improving the recording density since the light spots focused on the recording medium to form a pit, the smallest information unit cell, in the recording film of the recording medium cannot be smaller than the so-called "diffraction limit". . That is, the size of the light spot is limited to be smaller than the diffraction limit proportional to λ / NA depending on the wavelength λ of the light source and the numerical aperture NA of the objective lens. In order to make the size of the light spot smaller than the diffraction limit, the wavelength? Should be shortened or the numerical aperture NA should be increased. Recently, a blue laser with a wavelength of 450 nm has been developed for commercialization, but there is a limit to accepting high density information because the light spot cannot be small within the wavelength of light.

In light of the trend of mass storage of information, a new optical recording / reproducing method is required to overcome the limitations of the current optical recording / reproducing method. To this end, attention has been focused on a near field recording / reproduction (NFR) method using a near field, which is expected to significantly improve recording capacity.

Near-field recording / reproducing method can record / reproduce hundreds of angstroms of information cells using near field optics technology and ultra-micro electro mechanical system (MEMS) technology. Information can be recorded / played back. For example, the near field recording / playback method can record / play more than 20Gbytes of data that can record HDTV-quality video data over two hours in MPEG2 quality on one side of a 3cm diameter disc. It can be miniaturized. The near field recording / reproducing data recording / reproducing apparatus is composed of an optical tip of a nano scale and a system capable of driving the optical tip with high precision. The optical tip maintains a focal length within several tens of nm from the recording medium to focus light onto the recording medium so that light spots focused on the recording medium are focused to a small size. As a result, since light spots are condensed minutely on the recording medium of the near field recording / reproducing method, a pit formed on the recording medium may be formed to have a small size to record a large amount of information. At the time of reproduction, since the light intensity reflected from the recording medium decreases exponentially as it is far from the surface of the recording medium, the optical tip receives the reflected light by maintaining the focal length within several tens of nm from the recording medium, as in the case of recording. By photoelectric conversion, information is reproduced.

However, in the near field recording / reproducing method, when a scratch or dust is scratched on the surface of the recording medium, the aberration is largely caused by the light focused on the recording surface of the recording medium due to dust or scratches as the focal length of the light is minute. There is a problem that it is difficult to record and reproduce accurately.

Meanwhile, in the conventional optical recording / reproducing method, in order to protect the recording medium from dust or scratches, the recording medium is stored in a cartridge and commercially available. However, since the cartridge used in the conventional optical recording / reproducing method has an opening to open and close, it is difficult to block the inflow of dust during recording / reproducing, so that the focal length is smaller than the conventional optical recording / reproducing method. It is impossible to apply to the near field recording / reproducing method, in which adverse effects due to scratches are large.

In addition, the near field recording / reproducing method maintains a small focal length between the optical tip and the recording medium as described above, and transmits light to the head driving means and the optical tip for driving the optical tip to randomly access the recording medium. There is a need for optical transmission means.

Accordingly, it is an object of the present invention to provide a high density data recording / reproducing cartridge which can prevent a malfunction by reducing the recording medium from external air and reduce the volume of the cartridge.

Another object of the present invention is to provide a light transmission path and at the same time to drive the head to reduce the volume of the cartridge, to provide a high-density data recording / reproducing cartridge that can accurately record / reproduce by absorbing the vibration of the light focusing means have.

In order to achieve the above objects, the recording medium of the present invention; An optical transmission path forming a path of light between the light source and the recording medium; An optical mirror member for reflecting light emitted from the light source toward the light transmission path and reflecting light transmitted from the light transmission mirror toward the light source; Optical focusing means for concentrating the light transmitted via the optical transmission path to the recording medium and guiding the light reflected from the recording medium to the optical transmission path; A head means for forming an optical transmission path and causing the optical focusing means to float within a micro distance from the recording medium and to elastically support the optical focusing means to absorb vibration of the optical focusing means; Head driving means for transferring the head means to an arbitrary position on the recording medium; Recording medium driving means for rotating the recording medium; A hermetic housing for sealing the light source, the recording medium, the optical mirror member, the light converging means, the head means, the head driving means, and the recording medium driving means therein; A high density data recording / reproducing cartridge is provided.

It is possible to reduce the volume of the entire cartridge by securing a path of light between the light source and the recording medium through one optical transmission path, and by providing a head means for supporting the light focusing means at a small distance and elastically absorbing to absorb vibrations. Reduce the risk of error in the process of recording or reproducing the information on the recording medium, and the housing to seal the components for recording or reproducing information on the recording medium to prevent dust or foreign matter from entering the cartridge To do that.

The light source may emit light in a direction perpendicular to the light transmission path, and the light mirror member may be installed at 45 degrees with respect to the light source and the light transmission path to reflect light and transmit light between the light source and the light transmission path.

The light converging means has a sharp pointed tip, and is preferably spaced apart by a distance within a wavelength of light on the recording medium. This is to allow the proximity of the recording medium to be irradiated with a distance within the optical wavelength.

In addition, the head means, and a head slider for supporting the light focusing means; A suspension for applying a load to the head slider and elastically supporting it; An elastic bending part installed between the head slider and the suspension to absorb the flow of the head slider; It is preferably configured to include, the optical transmission path is preferably connected to the light converging means along the suspension. This is to reduce the recording / reproducing error caused by the vibration of the light converging means by providing the elastic bending portion.

The head driving means includes: a VCM magnet mounted on the other end where the light focusing means is installed as one end of the head means and receiving electromagnetic force; As the center of rotation of the head means, a head bearing for rotationally supporting the head means; It is preferable to comprise.

In addition, the optical mirror member is preferably provided coaxially with the rotation center of the head means as the inside of the head means. This is because the optical mirror member is installed at the center of rotation of the head means, so that the light transmitted from the optical mirror member can travel along the optical transmission path formed in the head means no matter where the head means rotates.

In addition, an optical path is preferably formed at the center of the head bearing such that light is transmitted between the light source and the optical mirror member.

In addition, the recording medium driving means includes a flange which is pressed through the center of the recording medium to the inner diameter of the recording medium; A permanent magnet mounted to the lower portion of the flange and subjected to electromagnetic force; A flange bearing for rotationally supporting the flange; It is preferable to comprise. This is because it is possible to seal all the components inside the cartridge by not having a separate recording medium driving motor, and to reduce the volume of the cartridge.

 Other objects and features of the present invention in addition to the above objects will become apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 1 to 7.

1 and 2, a disk 1 on which information is recorded / reproduced, a disk drive unit for rotating the disk 1, and a head and head drive unit for irradiating proximity light to the disk 1 are provided. The high density data recording / reproducing cartridge of the present invention is shown having a cartridge frame 2 and a cartridge cover 4 for shielding the cartridge frame 2. As can be seen from the figure, the disc 1, the head and the head drive are completely shielded from the outside by the cartridge frame 2 and the cartridge cover 4. Accordingly, it is possible to prevent dust, dust, and the like introduced with the external air flow as the disc rotates during recording / reproducing.

The disk drive includes a flange 8 serving as the center of rotation of the disk 1, a bearing 24 for smoothly rotating the flange 8, and a permanent magnet 20 for rotating the flange 8. It is provided. On the disc 1, a recording film made of a phase change recording material is formed. The flange 8 is pressed against the inner diameter of the disk 1, and a center of rotation is formed in the center of the disk 1 is fitted to the bearing 24. The flange 8 rotates in conjunction with the rotational force generated from the permanent magnet 20 to rotate the disk and clamps the disk 1 toward the center of rotation when the disk is rotated so that the disk does not flow in the vertical direction. ) The bearing 24 is installed to face the cartridge frame 2 and the cartridge cover 4 vertically so that the rotation shaft of the flange 8 is fitted. The bearing 24 serves to smooth the rotation of the disk 1 by reducing the frictional resistance of the rotating shaft of the flange 8 during the rotation of the disk. Permanent magnet 20 is installed under the flange (8) serves to generate a rotational driving force of the disk (1). To this end, a coil (not shown) to which a current is applied is provided in the disc driver to face the permanent magnet 20. In contrast to a general motor, the permanent magnet 20 and the flange 20 correspond to the rotor portion of the motor and the coil installed in the disc drive device and the coil wound coil corresponds to the stator portion of the motor. Accordingly, when a current is applied to the coil opposite to the permanent magnet 20, an electromagnetic circuit is formed between the permanent magnet 20 and the coil to generate a rotational force, and the rotation direction is determined according to the direction of the current. The head and the head driving unit will be described in detail with reference to FIGS. 3 to 5.

3 is a longitudinal cross-sectional view of the head and the head driving unit shown in FIG. 1, and FIGS. 4 and 5 are enlarged longitudinal cross-sectional views of the portion "A" and "B" shown in FIG.

3 to 5, the head and the head driving part are formed of an optical fiber 16 forming a light transmission path, and a tip 16a formed on the optical fiber 16 to irradiate the disk 1 with proximity light. ), The mirror 14 and coupler (Coupler) 26 for injecting light into the optical fiber 16, the head slider 18 for supporting the tip 16a, and the head slider 18 elastically A suspension bearing for providing a light incidence path 30 as well as smoothly driving a suspension 10, a VCM magnet 12, and a suspension 10 for driving the suspension 10. 32). The optical fiber 16 is fitted to the coupler 26 at the rotational center side of the suspension 10, mounted to the suspension 10 opposite the mirror 14, extended to the head slider 18, and then bent toward the disc 1. do. The end of the optical fiber 16 bent toward the disk 1 is formed with a conical tip 16a whose end is sharply processed. The optical fiber 16 transmits the light incident through the coupler 26 to the tip 16a and provides a light transmission path to transmit the reflected light received from the tip 16a toward the coupler 26. The tip 16a is driven by the head slider 18 and the suspension 10 while maintaining a small focal length on the surface of the disc 1. This tip 16a collects the light of the recording level transmitted from the optical fiber 16 at the end and irradiates the disk 1 in the form of proximity light when recording information, so that the minimum unit cell of information on the recording film of the disk 1 is recorded. It will form an pit. When the information is reproduced, the tip 16a irradiates the recording film of the disk 1 with the reproduction level to receive the reflected light reflected from the recording film and traveling back to the optical path. The mirror 14 is mounted on the suspension 10 between the light incident path 30 and the coupler 26 to reflect the light incident through the light incident path 30 toward the coupler 26. The coupler 26 couples one end of the optical fiber 16 to the suspension 10, guides the light incident from the mirror 14 toward the optical fiber 16, and transmits the reflected light transmitted from the optical fiber 16 to the mirror ( 14) will serve as a guide. The head slider 18 is elastically supported by the suspension 10 and is formed with a hole 18a into which the optical fiber 16 is bent and inserted. The tip 16a is positioned opposite the disk 1 through the hole 18a of the head slider 18. The suspension 10 is elastically supporting the head slider 18 and is rotated in conjunction with the rotational force generated from the VCM magnet 12 so that the head slider 18 and the tip 16a can be moved to any track of the disc 1. Random access is performed on the track. Accordingly, these head sliders 18 and suspension 10 are adapted to allow the tip 16a to maintain a small focal height from the surface of the disk 1 to access the information recording surface of the disk 1 when the disk is rotated. It is to control the floating height of within the wavelength of light. In detail, when the disk 1 starts to rotate, a flow velocity occurs on the surface of the disk 1. The air flow generated by the flow rate is represented by the floating force of the head slider 18. Then, the air slider causes the head slider 18 to rise from the surface of the disc 1 at the moment of surmounting the applied load applied from the suspension 10 and its own load. When the disk 1 rotates at a constant speed, the amount of air flow becomes constant, thereby maintaining a constant floating height. Here, the applied load of the suspension 10 is determined so that the height of the lift of the head slider 18 is maintained at a predetermined height from the disk of the height of the tip 16a. The head slider 18 is formed with an elastic flexure 19 which transmits the applied load of the suspension 10 to the head slider 18 and absorbs the flow of the head slider 18 when the disk is rotated. The VCM magnet 12 is mounted to the suspension 10 opposite to a coil (not shown) installed in the disc drive. The VCM magnet 12 is rotated by a rotational force generated by an electromagnetic circuit formed by applying a current to a coil installed in the disc drive device by generating magnetic flux. Suspension bearing 32 is made of a cylindrical shape so that the light incidence path 30 is provided on the inner side is installed on the rotation axis side of the suspension 10 so that the suspension 10 is interlocked with the rotational force generated from the VCM magnet 12 When it is done, it makes smooth the turning motion by reducing the friction force at the center of rotation. Accordingly, the suspension 10 is linked to the rotational force of the VCM magnet 12 to transfer the head slider 18 and the tip 16a to the inner circumferential side or the outer circumferential side of the disk 1.

Referring to the operation of the cartridge of the present invention having such a configuration step by step as follows. First, the cartridge is mounted in a disk drive installed in the information apparatus. In the information recording by the recording command, when the permanent magnet 20 and the flange 8 corresponding to the rotor part of the spindle motor rotate, the disk 1 rotates with them at an arbitrary rotation speed. Light irradiated at a recording level from an external light source (not shown) is collected by the objective lens 36 and incident on the mirror 14 via the light incidence path 30 as shown in FIGS. 6 and 7. Light incident on the mirror 14 is reflected, incident on the optical fiber 16 through the coupler 26, and transmitted to the tip 16a. Light transmitted to the tip 16a is focused in the form of proximity light at the end of the tip 16a to form the pit 1a. At this time, the tip 16a is supported by the head slider 18 to randomly access the disc 1 by the suspension 10 which pivots in conjunction with the rotational force from the VCM magnet 12. The reproduction of the information by the reproduction command is as follows. The light irradiated to the reproduction level from an external light source is focused on the recording film of the disk 1 in the form of a proximity light by the tip 16a via the mirror 14, the coupler 26 and the optical fiber 16, and then the disk When reflected by the recording film of (1) and traveling back to the optical path and incident to an external light source, the information is reproduced by being converted into an electrical signal by a photoelectric conversion element (for example, a photo diode) provided externally. On the other hand, the external light source for irradiating light is fixed to the incident light path 30 in the disk drive without the need to move because the light incidence path 30 is present in the center of the rotation axis.

As described above, the high-density data recording / reproducing cartridge according to the present invention can minimize the optical error generated during recording / reproducing by foreign matter such as dust introduced into the external air by disconnecting the recording medium from the external air. By absorbing the vibration of the light converging means, accurate recording / reproducing is possible. The high density data recording / reproducing cartridge according to the present invention has an optical fiber for transmitting light and a tip for focusing the light transmitted from the optical fiber in the form of proximity light, so that light can be irradiated to the recording medium in the form of proximity light. Of course, the height of the tip is controlled within the predetermined height from the recording medium by the head slider and the suspension, and the head driving part is installed in the suspension, so that the tip can randomly access the disc, thereby recording / reproducing information.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

1 is a perspective view showing a high density data recording / reproducing cartridge according to an embodiment of the present invention.

Fig. 2 is a sectional perspective view of the cartridge for high density data recording / reproducing shown in Fig. 1.

3 is a cross-sectional view showing in detail the head and the head drive shown in FIG.

4 is an enlarged cross-sectional view of a portion “A” in FIG. 3.

FIG. 5 is an enlarged cross-sectional view of a portion “B” in FIG. 3. FIG.

FIG. 6 is a cross-sectional perspective view of the head and the head driving unit showing the optical path of the head and the head driving unit shown in FIG.

FIG. 7 is an enlarged cross-sectional view of a portion “B” and a disc in FIG. 3 during recording / reproduction; FIG.

<Description of Symbols for Main Parts of Drawings>

1: Disc 1a: Feet

2: cartridge frame 4: cartridge cover

8: flange 10: suspension

12: VCM magnet 14: mirror

16: optical fiber 16a: tip

18: Head Slider 18a: Hole

20: permanent magnet 24: bearing

26: coupler 30: light incident path

32: suspension bearing 36: objective lens

Claims (9)

Recording media, An optical transmission path forming a path of light between a light source and the recording medium; An optical mirror member for reflecting light incident from the light source toward the light transmission path and reflecting light transmitted from the light transmission path toward an additional light source; Light converging means for concentrating light transmitted through the optical transmission path to the recording medium and guiding light reflected from the recording medium to the optical transmission path; A head means for forming the optical transmission path and causing the optical focusing means to float within a small distance from the recording medium and to elastically support the optical focusing means to absorb vibration of the optical focusing means; Head driving means for transferring the head means to an arbitrary position on the recording medium; Recording medium driving means for rotating the recording medium; A hermetic housing for sealing the light source, the recording medium, the optical mirror member, the light converging means, the head means, the head driving means, and the recording medium driving means therein; A high density data recording / reproducing cartridge, characterized in that it comprises a. The method of claim 1, And the optical transmission path is made of an optical fiber. The method of claim 1, The light source emits light in a direction perpendicular to the light transmission path, And the optical mirror member is installed at 45 degrees with respect to the light source and the light transmission path to reflect light to transmit light between the light source and the light transmission path. The method of claim 1, The optical converging means has a sharp pointed end portion, the high density data recording / reproducing cartridge, characterized in that spaced apart by a distance within the wavelength of light on the recording medium. The method of claim 1, The head means, A head slider for supporting the light focusing means; A suspension for elastically supporting a load while applying a load to the head slider; An elastic bending part installed between the head slider and the suspension to absorb the flow of the head slider; Including, And the optical transmission path is connected to the optical converging means along the suspension. The method of claim 1, The head driving means, A VCM magnet attached to the other end having the light converging means installed therein as one end of the head means to receive electromagnetic force; A head bearing for rotationally supporting the head means as a focal center of the head means; A high density data recording / reproducing cartridge, characterized in that it comprises a. The method of claim 6, And the optical mirror member is provided inside the head means and is coaxial with the rotation center of the head means. The method of claim 6, And a light path formed at a center of the head bearing such that light is transmitted between the light source and the optical mirror member. The method of claim 1, The recording medium driving means, A flange which penetrates the center of the recording medium and is pressed against the inner diameter of the recording medium; A permanent magnet mounted to the lower portion of the flange and subjected to electromagnetic force; A flange bearing for rotationally supporting the flange; A high density data recording / reproducing cartridge, characterized in that it comprises a.