KR100631508B1 - Near-field optical recording device - Google Patents

Abstract

The present invention relates to a near field optical recording apparatus, comprising: a lens for injecting light into a recording medium and transmitting reflected light, a head slider mounting the lens, a suspension arm connecting the head slider, and the suspension arm; A pickup for supporting, a light source installed inside the pickup, drive means connected to the pickup to enable rotational movement of the head slider, a deck for isolating each component from the outside, and inside the deck Provided in the present invention is a near field optical recording device comprising an aspherical mirror which is incident on the lens by changing the path of the light generated from the light source. According to the present invention, the load of the driving means of the near field optical recording device can be reduced, and thus the driving means can more accurately control the operation of the head slider.

Description

Near-field optical recording device {NEAR-FIELD OPTICAL RECORDING DEVICE}

1 is a perspective view showing a conventional near field optical recording device.

2 is a perspective view showing a near field optical recording device of the present invention.

3 is a plan view from above of the device of FIG. 2;

4 is a schematic diagram showing that the light is reflected in the aspherical mirror to change the path.

5 is a perspective view specifically showing an aspherical mirror.

*** Explanation of symbols for main parts of drawing ***

21: Aspheric mirror 22: Recording medium

24: Pick-up part 25: VCM

26: suspension arms 27: light

28: head slider 29: lens

The present invention relates to a near field optical recording apparatus, and more particularly, to an apparatus using an aspherical mirror as a means for supplying light generated from a light source to a lens.

The research on near field recording / reproduction using near field, which is expected to dramatically improve the recording capacity according to the trend of increasing the capacity of information, is increasing.

The principle of near field optical recording and reproduction is as follows. Light entering the lens at an angle greater than or equal to the critical angle is totally reflected when traveling from a dense refractive index to a small one. At this time, due to total reflection of light, light of very small intensity exists on the surface of the lens, which is called an evanescent wave or dissipation wave. Using this evernet wave, it is possible to achieve high resolution, which is impossible because of the diffraction limit, which is an absolute limit of resolution due to diffraction of light in the far-field. The near field optical recording and reproducing optical system totally reflects the light in the lens to generate an Evernet wave on the surface of the lens, and records and plays back by coupling the Evernet wave and the recording medium.

1 is a perspective view showing a conventional near field optical recording device 10. In the deck 18, a central portion of the disk 11, which is a recording medium, is mounted on the spindle motor (not shown) so as to be rotatable, and a recording and reproducing apparatus is provided on the other side of the inside. The floating head slider 12 is supported by the suspension arm 14 on the upper surface of the disc, and one side of the suspension arm is connected to the pickup 17. A voice coil motor (VCM) 16 is installed at the lower portion of the pickup unit to drive the pickup unit at a predetermined range of angles. On the other hand, a fixed arm 13 is supported on the upper surface of the head slider from the pickup, and a prism 15 is provided at the end of the fixed arm. Light generated by a light source (not shown) of the pickup part is reversed in the prism, passes through the lens 19 mounted on the head slider, and finally enters the disk surface. It is possible to record or reproduce the optical information by the interaction of the incident light with the disk surface.

The head slider of the near field optical recording apparatus must be close to the distance between the opposing lens and the recording medium so that the near field light can be used for optical recording. In order for the head slider to maintain a very small gap with the recording medium, the weight of the optical system mounted on the head slider should be minimized. To this end, only the optical lenses (objective lens and the opposing lens) are mounted on the head slider, and the light source for generating light incident on the optical system is not mounted on the head slider but placed in the pickup unit. Therefore, in order to accurately enter the light generated from the light source into the optical center axis of the optical lens, a means for changing the path of the light generated from the light source, such as the prism 15 of FIG. 1, is required. In addition, the fixed arm mounted with the prism and the suspension arm mounted with the head slider mounted with the optical lens must have the same plane motion. To this end, the fixed arm and the suspension arm are driven by the same VCM.                         

The fixed arm equipped with the prism has a very strong rod with almost no deformation, and its weight is larger than that of the suspension arm, which increases the load on the driving means, and thus has a great adverse effect on controlling the exact position of the optical head slider. Can be crazy

SUMMARY OF THE INVENTION An object of the present invention is to provide a means for injecting light into a lens with a small load on a driving means in a near field optical recording apparatus. It is also an object of the present invention to provide a means for the light incident on the lens to be incident on the optical center axis of the lens constantly irrespective of the incident direction of the light source. It is also an object of the present invention to reduce the load on the driving means so that the driving means can more precisely control the operation of the head slider.

The present invention provides a lens for injecting light into a recording medium and transmitting reflected light, a head slider mounting the lens, a suspension arm connecting the head slider, a pickup unit supporting the suspension arm, and the pickup; A light source installed inside the unit, drive means connected to the pick-up unit to enable rotational movement of the head slider, a deck for isolating each component from the outside, and installed inside the deck and generated from the light source. The present invention provides a near field optical recording device including an aspherical mirror that enters the lens by changing a path of light.

Unlike the related art, the near field optical recording apparatus does not include a fixed arm equipped with a prism and a prism for changing a path of light generated from a light source. In the present invention, the load of the driving means is lowered by supplying light to the lens through the aspherical mirror instead of the fixed arm and the prism mounted on the fixed arm, which means that the driving means can more precisely control the operation of the head slider. To be able.

The aspherical mirror of the present invention is fixed at a predetermined position inside the deck, and changes the path of the light so that the light generated from the light source is incident on the optical axis of the lens mounted in the head slider. The aspherical mirror is sized to cover the rotation angle of the driving means so that the light generated from the light source can be incident on the lens of the head slider even if the incident direction is changed according to the rotation operation of the driving means.

Hereinafter, the present invention will be described in detail with reference to the drawings. 2 is a perspective view showing a near field optical recording device of the present invention. Unlike the prior art, there is no fixed arm equipped with a prism and a prism. The light 27 generated from the light source (not shown) installed in the pickup unit 24 is incident on the aspherical mirror 21, and is reflected by the mirror surface to reflect the lens of the head slider 28 mounted on the suspension arm 26. It enters into (29). The head slider is driven by the VCM 25 as a driving means for recording or reproducing in each area of the recording medium 22, and rotates at a predetermined range of angles, but the aspherical mirror is fixed without rotation.

FIG. 3 is a plan view of the near field optical recording device of FIG. 2 viewed from above. FIG. Light 27 emitted from a light source (not shown) of the pickup part 24 is reflected by the aspherical mirror 21. It can be seen that the aspherical mirror is provided with a size close to the radius of the recording medium so as to include all of the recordable areas of the recording medium 22.                     

4 is a schematic diagram showing a state in which light incident on an aspherical mirror is incident on a lens. It can be seen that the light 31 generated from the light source is reflected to the center on the optical axis of the lens 32 positioned below after touching the inner surface of the aspherical mirror 30. The head slider 28 (FIG. 2) is mounted on the suspension arm (26 in FIG. 2) and operates while keeping parallel with the light generated from the light source by the rotation operation of the driving means. Therefore, the light supply can be made constant regardless of the position of the head slider as long as the path is changed at an angle in the aspherical mirror so that the light generated from the light source is accurately incident on the optical axis of the lens of the head slider. Therefore, the curvature in the vertical direction of the inner surface of the aspherical mirror should be determined so that light from the light source is incident on the optical axis of the lens of the head slider.

5 is a perspective view showing an aspherical mirror of the present invention. When the driving means (not shown) rotates within the range of the rotation angle θ with respect to the rotation center 31, the size of the aspherical mirror 30 is a light source (not shown) in the range of the angle θ by the rotation operation of the driving means. It should be determined so as to reflect the light 31 generated from). When light generated from the light source hits each point a, b, and c of the aspherical mirror, it should be reflected at a constant angle regardless of its position. Therefore, the curvature of the aspherical mirror in the horizontal direction is determined so that the light generated from the light source can be reflected at the same angle by covering the rotation radius of the driving means.

The aspherical mirror of the present invention is not driven by a driving means, unlike a prism mounted to a conventional fixed arm, and is fixed at a predetermined position inside the deck of the near field recording apparatus. The fixed position can be any position where the light generated from the light source can be reflected in the aspherical mirror and incident on the lens of the head slider. In addition, the fixing method of the aspherical mirror may be directly fixed to the upper surface inside the deck to be coupled, or may be fixed through two shafts fixed to the connecting means separately installed on both sides of the deck, for example, both sides of the deck frame. It may be implemented in various forms according to the configuration of the device or manufacturing conditions.

As described above, the present invention can reduce the load of the driving means by providing a near field optical recording device equipped with an aspherical mirror as a means for injecting light into the lens while the load is applied to the driving means with less load. The means can control the operation of the head slider more precisely. In addition, light incident on the lens may be incident on the optical axis of the lens in a constant manner irrespective of the direction of incidence of the light source, and the aspherical mirror may be installed at various positions in the device in various ways, thereby providing various modifications. It can also be applied to structures. In addition, since the light path can be changed with only a simple aspheric mirror, the assembly of the device can be easily performed, thereby improving manufacturing efficiency and productivity.

Claims (4)

A lens for injecting light into the recording medium and transmitting the reflected light, an optical head slider on which the lens is mounted, a suspension arm connecting the optical head slider, a pickup unit for supporting the suspension arm, and the pickup unit A light source installed therein, drive means connected to the pick-up unit and rotating within a predetermined angle to drive a rotation operation of the optical head slider, a deck for isolating each component from the outside, and inside the deck. And an aspherical mirror disposed on the lens by changing a path of light generated from the light source. The horizontal and vertical curvature of the aspherical mirror is determined so as to reflect the light generated from the light source to the lens at the same angle even if the direction of incidence of the light generated from the light source changes according to the rotation of the driving means. Near field optical recording device. The near field optical recording apparatus of claim 1, wherein the aspheric mirror is fixed to an upper surface of the deck. The near field optical recording apparatus according to claim 1, wherein the aspherical mirror is connected to and fixed to a connecting means installed on the side of the deck.

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