KR100556737B1 - Optical swing arm ultra small optical disk driver - Google Patents

Abstract

The present invention relates to an optical swing arm of a compact optical disk drive, comprising: a swing operating arm (320) hinged to an optical disk drive body; A VCM 400 coupled to a rear end of the optical swing arm 300 to generate a driving force of a swing motion based on a hinge point; A suspension assembly 360 fixed to the swing actuating arm 320; An optical flying head 350 assembled to the front end of the suspension assembly 360 and provided with a MEMS actuator 357 and an objective lens 353 for correcting manufacturing and assembly errors; A base optical unit 330 which is separated from the objective lens 353 and installed on the swing operation arm 320 so as to be located on the outside of the disk in a plane; It is coupled to the front end of the swing operation arm 320 includes a folding mirror 340 for adjusting the path of the beam incident from the base optical unit 330 and the optical flying head 350, the objective lens 353 ) And only the folding mirror 340 which folds the beam from the base optical unit 330 in the direction of the objective lens 353 so as to be planarly positioned in the recording / reproducing area of the disc. The present invention can make the optical system very small and thin by separating the base optical unit and the objective lens stage, and implement the focusing as an optical flying head having an air bearing surface means to significantly reduce the space occupied by the actuator in the optical pickup. In addition, it is possible to improve the thickness and reliability of the optical system by making it possible to compensate the manufacturing and assembly tolerances of the optical system and the optical flying head with the MEMS (micro electromechanical system) actuator formed in the optical flying head.

Description

OPTICAL SWING ARM ULTRA SMALL OPTICAL DISK DRIVER}

1 to 8 is a view according to the present invention,

1 is a perspective view of a micro optical disc drive.

2 is a partial perspective view of a micro optical disc drive.

3 is a perspective view of an optical swing arm.

4 is an exploded perspective view of an optical swing arm.

5 is a perspective view of a head gimbal assembly (HGA).

6 is a perspective view of a base optical unit (BOU).

7 is a perspective view of an optical flying head (OFH).

8 is a longitudinal sectional view of OFH.

<Description of the symbols for the main parts of the drawings>

300: optical swing arm 310: pivot bearing

320: swing operation arm 330: base optical unit

340: folding mirror 350: optical flying head

353 objective lens 357 MEMS actuator

360: Suspension Assembly 400: VCM

The present invention relates to an optical swing arm of an ultra-compact optical disc drive, and in particular, the optical system can be manufactured very small and thin by separating the base optical unit and the objective lens stage, and the optical flying head having the air bearing surface means realizes the focusing. The space occupied by the actuator in the pickup can be significantly reduced, and the optical system can be made thinner by compensating for the manufacturing and assembly tolerances of the optical and optical flying heads with the micro electromechanical system (MEMS) actuator formed in the optical flying head. It relates to an optical swing arm of a compact optical disk drive to improve reliability.

The optical disc drive market is composed of data storage and player market such as CD and DVD, and its size is used for CD-ROM size or notebook used in general desktop PC. It is roughly classified into a slim size of about 10 mm thick.

Optical pickup, the recording / reproducing means used for this kind of data storage, is composed of LD, PD, various kinds of lenses and mirrors in the pickup base, and also the objective lens. It is supported by a 4-wire actuator, etc., and is assembled to a pickup base for tracking and focusing.

Recently, however, the PCMCIA (Personal Computer Memory Card International Association) or the compact flash (Storage Device) is used as a storage device for a mobile device such as a PDA, an MP3 player, a DSC, a camcorder, and an auxiliary storage device in a notebook. Compact flash size data storage has been studied a lot. In order to develop a storage device of this size, a recording / reproducing means or a drive mechanism having a structure such as a conventional pickup or actuator has a limitation in reducing its size, and therefore, development of a new pickup or actuator is required.

The latest data play optical disc drive is a reflection of this attempt, which is achieved by integrating each optical element of an existing pickup into a single basic optical unit (BOU). The size of the optical pickup is greatly reduced by the fact that two rotary voice coil motors (VCMs) are separately configured outside the optical system for tracking and focusing instead of the four-wire actuators, which require the actuator to be located inside the pickup. It is configured to drastically reduce.

However, data play products have also been significantly reduced in area, but are about 11mm in height, making them difficult to use as mobile devices. The reason for the height limitation is that the base optical unit of the data includes an objective lens, so that the base optical unit itself is quite high, and this requires the thickness of the swing arm and the free space for focusing motion. This is because the thickness of the swing arm tip cannot be reduced.

In the description of the present invention, in the following description, the pickup is a pickup because the base optical unit and the actuator are mounted on an arm that swings as compared to the conventional pickup that performs linear motion. The term swing arm will be used instead of the term.

The present invention has been made to solve the above-mentioned problems and defects as described above. The optical flying head can be manufactured very small and thin by separating the base optical unit and the objective lens stage and focusing the air flying surface means. It can dramatically reduce the space occupied by the actuator in the optical pickup, and compensate for the manufacturing and assembly tolerances of the optical and optical flying heads with the micro electromechanical system (MEMS) actuators formed in the optical flying heads. Accordingly, an object of the present invention is to provide an optical swing arm of an ultra-compact optical disc drive that can improve the thickness and reliability of an optical system.

In order to achieve the above object, the optical swing arm of the micro-optical disk drive according to the present invention is a swing operating arm hinged to the optical disk drive main body, and coupled to the rear end of the optical swing arm based on the hinge point to drive the swing motion. An optical flying head equipped with a VCM for generating a light source, a suspension assembly fixed to the swing operation arm, a MEMS actuator and an objective lens assembled at a distal end of the suspension assembly, and correcting manufacturing and assembly errors; A base optical unit mounted to the swing operation arm to be separated from a lens and positioned outwardly of the disk, and coupled to a tip of the swing operation arm to adjust a path of a beam incident from the base optical unit and the optical flying head And a folding mirror for the objective lens Only the folding mirror for bending the beam out of the base optical unit in the direction of the objective lens is provided so as to be located in the recording / reproducing area of the disc in a planar manner.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail as follows.

1 to 8 are views according to the present invention, FIG. 1 is a perspective view of a micro optical disc drive, FIG. 2 is a partial perspective view of a micro optical disc drive, FIG. 3 is a perspective view of an optical swing arm, and FIG. 4 An exploded perspective view of an optical swing arm is shown in FIG. 5, a perspective view of a head gimbal assembly (HGA) is shown in FIG. 5, and a perspective view of a base optical unit (BOU) is shown in FIG. 6. 7 shows a perspective view of an optical flying head (OFH), respectively, and FIG. 8 shows a longitudinal sectional view of the optical flying head.

1 and 2 illustrate a structure of a 5mm-thick small optical disk drive of a swing arm type, which is currently being developed, and as shown in FIG. 1, a spindle on the main base 110 of the ultra-compact optical disk drive main body 100. The motor 200, the optical swing arm 300, the voice coil motor (VCM) 400 and the cartridge loading (cartridge loading) mechanism 500 and the like is composed of an optical disk (not shown) When the cartridge 10 is inserted into the drive, it is possible to perform a series of recording / playback operations.

Hereinafter, referring to FIGS. 1 to 8, such a compact optical disk drive may have a disk in the cartridge 10 seated on the spindle motor 200 by the cartridge loading mechanism 500 once the cartridge 10 is inserted. Is rotated to CLV having a constant linear velocity in the counterclockwise direction by the driving force of the spindle motor 200, the optical swing arm 300 is supported on the main base 110 by a pivot bearing (pivot bearing) A signal is recorded and reproduced on the disk while swinging around 310. The VCM 400 coupled to the end of the optical swing arm 300 generates a driving force capable of swinging the optical swing arm 300.

The optical swing arm 300 is composed of a swing operation arm 320, VCM 400 and the pivot bearing 310 as shown in Figs. The swing operation arm 320 is a main component to which the VCM 400 and the pivot bearing 310 are assembled, and the base optical unit 330 including the almost all optical systems of the typical optical pickup is assembled therein.

In FIG. 3, reference numeral 321 denotes a flexible printed board (FPCB) assembly, and 322 illustrates a printed circuit board fixed to the main base 110.

5 shows a head-gimbal assembly (HGA).

3 to 5 together, the head gimbal assembly 370 is an assembly in which an optical flying head 350 is assembled at a distal end of a suspension assembly 360. In addition to the function of connecting the optical flying head 350 to the swing operation arm 320, the rigidity in the lateral direction of the suspension assembly 360, the swing operation arm 320 is very sensitive to the left and right vibration during tracking It is designed to be strong, and its rigidity in the vertical direction is small so that it can quickly follow the run-out of the disk.

FIG. 6 is a diagram illustrating the structure and function of the base optical unit 330. All optical systems of the existing optical pickup except for the objective lens 353 and the folding mirror 340 (see FIG. 8) are integrated. In the optical element block 331 of the LD / PD, LD and PD are mounted in a chip form, and the base optical unit 330 includes a collimator 332 and a beam splitter. It is composed of a splitter 333, a servo HOE, a collimator and a polarizer 334 to serve as a conventional pickup optical system. An FPCB assembly 335 is attached to the rear of the optical element block 331 to transmit a signal of the LD / PD, and a thermal adhesive is formed between the base optical unit 330 and the swing operation arm 320. Thermal adhesive is applied to transfer heat from LD to the swing arm.

7 and 8 illustrate a perspective view and a longitudinal cross-sectional view of an optical flying head (OFH). Referring to FIGS. 7 and 8, the optical flying head 350 includes an objective lens 353 and an MO coil 355. It has a function of mounting (mounting) and passive focusing (passive focusing) of the objective lens (353) and its structure is as follows.

The main body of the optical flying head 350 is a glass substrate 351 and a silicon block 352 on top of which a micro electromechanical system (MEMS) actuator 357 is formed and bonded to each other. The objective lens 353 is adhered to the objective lens holder 356 formed on a part of the actuator 357. The MO coil 355 and the air bearing surface (ABS) 358 are formed at the lower end of the glass substrate 351 by MEMS process. The MEMS actuator 357 performs a function of making correction by adjustment by self-driving such as processing and assembly of the optical flying head 350 and processing tolerance of the error objective lens 353. In addition, the air bearing surface 358 has a function of maintaining the gap between the disc and the optical flying head 350 at a constant height (for example, 200 nm) to maintain focusing without a separate focusing actuator. .
As described above, the optical system includes the base optical unit 330 of FIGS. 3 to 6, the folding mirror 340 and the objective lens 353 of FIGS. 7 and 8, and the objective lens which is the last component of the optical system. (objective lens) 353 is mounted on a slider 354 of the optical flying head 350 of FIGS. 7 and 8 and is supported by the suspension assembly 360 of FIG. Is supported by the swing operating arm 320 of the.
The base optical unit 330 and the objective lens 353 are separated from each other, and the base optical unit 330 is located on the outside of the disk in a plane, and the objective lens 353 and the base optical unit 330 are disposed. Only the folding mirror 340, which deflects the laser beam passing through the objective lens 353, is installed in a planar / recording area of the disc in this manner. The portion occupied by the base optical unit 330 may be removed.

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As described above, the present invention integrates the optical system through the first base optical unit 330 and separates the base optical unit 330 and the objective lens 353 stage, thereby making the optical system very small and thin, and secondly focusing. By enabling the optical flying head 350 with the air bearing surface 358 means, the space occupied by the actuator in the optical pickup can be drastically reduced, and the manufacturing and assembly tolerances of the optical system and the optical flying head 350 can be reduced. By compensating with the MEMS actuator 357 formed in the optical flying head 350, the optical system has a merit of improving slimming and reliability. Due to this effect, it is possible to manufacture the thickness of the main portion of the optical swing arm (part overlapping with the height of the other parts) to less than 2mm, it is possible to implement the optical disk drive body 100 of 5mm thickness.

Claims (1)

A swing actuating arm 320 hinged to the optical disc drive body and provided with an air bearing surface 358 means for focusing; A VCM 400 coupled to a rear end of the optical swing arm 300 to generate a driving force of a swing motion based on a hinge point; A suspension assembly 360 fixed to the swing actuating arm 320; An optical flying head 350 assembled to the front end of the suspension assembly 360 and provided with a MEMS actuator 357 and an objective lens 353 for correcting manufacturing and assembly errors; A base optical unit 330 which is separated from the objective lens 353 and installed on the swing operation arm 320 so as to be located on the outside of the disk in a plane; It is coupled to the front end of the swing operation arm 320 includes a folding mirror 340 for adjusting the path of the beam incident from the base optical unit 330 and the optical flying head 350, Only the folding mirror 340, which folds the beams from the objective lens 353 and the base optical unit 330 in the direction of the objective lens 353, is arranged to be planarly positioned in the recording / reproducing area of the disc. Optical swing arm in a compact optical disk drive.

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