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WO1999000793A1 - Mecanisme de capteur optique desaxe pour unites de stockage optique - Google Patents

Mecanisme de capteur optique desaxe pour unites de stockage optique Download PDF

Info

Publication number
WO1999000793A1
WO1999000793A1 PCT/SG1998/000050 SG9800050W WO9900793A1 WO 1999000793 A1 WO1999000793 A1 WO 1999000793A1 SG 9800050 W SG9800050 W SG 9800050W WO 9900793 A1 WO9900793 A1 WO 9900793A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical
pipe
optical pickup
gear
opu
Prior art date
Application number
PCT/SG1998/000050
Other languages
English (en)
Inventor
Michael Anh Nguyen
Zheng Tang
Original Assignee
Omni Peripherals Pte Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Omni Peripherals Pte Ltd. filed Critical Omni Peripherals Pte Ltd.
Publication of WO1999000793A1 publication Critical patent/WO1999000793A1/fr

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1362—Mirrors
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/0857—Arrangements for mechanically moving the whole head
    • G11B7/08576—Swinging-arm positioners

Definitions

  • the present invention relates generally to the field of optical storage drives, and particularly to an optical pickup mechanism for optical storage drives.
  • Optical storage drives such as CD-ROM and DVD drives are well known in the art.
  • An important element in such drives is the optical pickup unit (OPU).
  • the OPU comprises laser light emitting diode, light detector, optical lens, and a voice coil.
  • the voice coil is used to position the lens for proper focusing and tracking during a read/write operation.
  • an optical storage device e.g., CD- ROM
  • the entire OPU has to move radially to the storage device on a linear sliding rail system.
  • the OPU and the mechanism for positioning the OPU shall collectively be referred to as an optical pickup mechanism.
  • the mechanism To have a reliable optical pickup mechanism, the mechanism must be capable of high acceleration without incurring vibrational problems. Since such a mechanism would greatly shorten the data access time of the current optical storage drives, it is easy to why such a mechanism would be highly desirable and useful in the optical storage drive industry.
  • the present invention basically comprises an optical pickup unit
  • a baffle surrounds the OPU and a cover is placed on top of the baffle.
  • a first gear is attached to the pipe.
  • the first gear is meshed with a second gear which is connected to a motor.
  • the optical pipe comprises a hollow tube having a channel. The tube is bent at an angle in two places (here at 90 degrees) though it can be bent at fewer or more places or at a different angle depending on how one wants to direct the light beam.
  • a reflective mirror is placed to direct the light to the lens element.
  • the pipe should preferably be made of light and durable material to reduce its overall moment of inertia.
  • the OPU is a standard item currently available.
  • the eye of the OPU for emanating and receiving light beams is placed directly under the opening of the hollow tube such that any light emanating from the OPU directed to the lens element via the mirrors, and any light reflected back into the lens element is directed back to the OPU eye.
  • the optical pipe can rotate controllably via the first and second gears and the motor.
  • the pipe should be situated adjacent to the storage device such that the end of the pipe with the lens element of cuts across every track as the pipe is rotated through its full range of motion.
  • FIG. 1 is a perspective diagram illustrating the present off-axis optical pickup mechanism.
  • FIG. 2 is a perspective diagram illustrating individual elements comprising the present off-axis optical pickup mechanism.
  • FIG. 3 is a cross-sectional view of the optical pipe of the present off- axis optical pickup mechanism.
  • FIG. 1 illustrates the preferred embodiment of the present optical pickup mechanism 1.
  • the present invention basically comprises an optical pickup unit (OPU) 2 connected to an optical pipe 4.
  • OPU optical pickup unit
  • a baffle 6 surrounds the OPU and a cover 8 is placed on top of the baffle 6.
  • the present invention may still function without the baffle 6 and the cover 8 in place so long as the optical pipe 4 is properly engaged with the OPU.
  • a first gear 10 is attached to the pipe 4.
  • the first gear 10 is meshed with the second gear 12 which is connected to a motor 14.
  • the optical pipe 4 comprises a hollow tube 18 having a channel 17.
  • the tube is bent at an angle in two places (here 90 degrees), 18a and 18b, though it can be bent at fewer or more places or at a different angle depending on how one wants to direct the light beam.
  • a reflective mirror 20a and 20b, is placed to direct the light to the lens element 22.
  • the pipe 4 should preferably be made of light and durable material to reduce its overall moment of inertia. Although mirrors are used in this preferred embodiment, it should appreciated other means for deflecting light other than mirrors are possible, and, thus, they are contemplated within the scope of this present invention.
  • the OPU 2 is a standard item currently available.
  • the eye 16 of the OPU for emanating and receiving light beams is placed directly under the opening 24 of the hollow tube 18 such that any light emanating from the OPU 2 directed to the lens element 22 via the mirrors 20a and 20b, and any light reflected back into the lens element 22 is directed back to the OPU eye 16.
  • the optical pipe 4 can rotate controllably via the gears 10 and 12 and the motor 14. Other means for controllably rotating the optical pipe 4 are clearly available.
  • the pipe 4 should be situated adjacent to the storage device 26, as shown in FIG. 1 , such that the end of the pipe 4 with the lens element 22 of cuts across every track as the pipe 4 is rotated through its full range of motion.
  • the present mechanism is able to reduce the time to access a new track because the optical pipe 4 can be accelerated at a high rate due to its low moment of inertia.
  • the entire optical pickup unit had to move, here, only the pipe 4, and not the entire OPU, moves.
  • This configuration moreover, eliminates the vibrational problem associated with the previous design because the element which is most susceptible to induced vibration, the OPU, remains stationary.
  • the present design is much simpler and relatively inexpensive to manufacture because it does not require a complex rail system, but simply rotates on a single axis.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

L'invention concerne un mécanisme de capteur optique désaxé comprenant un capteur optique (OPU) relié à un guide d'ondes optiques. Une enceinte entoure l'OPU et un couvercle est placé sur la partie supérieure de l'enceinte. Afin de faire pivoter le guide d'ondes optiques, un premier pignon est fixé au guide d'ondes. Le premier pignon est en prise avec un second pignon qui est relié à un moteur. Le guide d'ondes optiques comprend un tube creux présentant un canal. Le tube est coudé en deux points (ici à 90 degrés). A chaque coude, un miroir renvoie la lumière vers la lentille. Le guide d'ondes devrait, de préférence, être constitué d'un matériau léger et durable afin que son moment global d'inertie soit réduit.
PCT/SG1998/000050 1997-06-30 1998-06-29 Mecanisme de capteur optique desaxe pour unites de stockage optique WO1999000793A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SG9702311A SG93816A1 (en) 1997-06-30 1997-06-30 Off-axis optical pickup mechanism for optical storage drives
SG9702311-3 1997-06-30

Publications (1)

Publication Number Publication Date
WO1999000793A1 true WO1999000793A1 (fr) 1999-01-07

Family

ID=20429686

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SG1998/000050 WO1999000793A1 (fr) 1997-06-30 1998-06-29 Mecanisme de capteur optique desaxe pour unites de stockage optique

Country Status (2)

Country Link
SG (1) SG93816A1 (fr)
WO (1) WO1999000793A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01217734A (ja) * 1988-02-26 1989-08-31 Toshiba Corp 光学ヘッド
JPH03113742A (ja) * 1989-02-28 1991-05-15 Ricoh Co Ltd 分離型光ピックアップ装置
JPH03102655A (ja) * 1989-09-14 1991-04-30 Sony Corp 光学ピックアップ装置

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 13, No. 530, (P-966), 1989; & JP,A,01 217 734 (TOSHIBA CORP.) 31 August 1989. *
PATENT ABSTRACTS OF JAPAN, Vol. 15, No. 296, (P-1231), 1991; & JP,A,03 102 655 (SONY CORP.) 30 April 1991. *
PATENT ABSTRACTS OF JAPAN, Vol. 15, No. 316, (P-1237), 1991; & JP,A,03 113 742 (RICOH CO., LTD.) 15 May 1991. *

Also Published As

Publication number Publication date
SG93816A1 (en) 2003-01-21

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