WO2006038139A1 - An arrangement for an optical pickup unit - Google Patents

An arrangement for an optical pickup unit Download PDF

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Publication number
WO2006038139A1
WO2006038139A1 PCT/IB2005/053124 IB2005053124W WO2006038139A1 WO 2006038139 A1 WO2006038139 A1 WO 2006038139A1 IB 2005053124 W IB2005053124 W IB 2005053124W WO 2006038139 A1 WO2006038139 A1 WO 2006038139A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical pickup
pickup unit
arrangement
tilt
tilt position
Prior art date
Application number
PCT/IB2005/053124
Other languages
French (fr)
Inventor
Kum C. Loh
Yeow K. Teh
Original Assignee
Arima Devices Corporation
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 Arima Devices Corporation filed Critical Arima Devices Corporation
Publication of WO2006038139A1 publication Critical patent/WO2006038139A1/en

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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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/095—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for discs, e.g. for compensation of eccentricity or wobble
    • G11B7/0956—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for discs, e.g. for compensation of eccentricity or wobble to compensate for tilt, skew, warp or inclination of the disc, i.e. maintain the optical axis at right angles to the disc
    • 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
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0925—Electromechanical actuators for lens positioning
    • G11B7/0935—Details of the moving parts
    • 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
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD
    • 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
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0925—Electromechanical actuators for lens positioning
    • G11B7/0933—Details of stationary parts

Definitions

  • the invention relates to an optical arrangement in an electronic apparatus, and more particularly to an optical arrangement in digital recording and playing discs such as DVD and Blu-ray discs.
  • DVD or DVD-ROM digital video discs
  • DVD-R/RW digital video discs
  • DVD-RAM digital video discs
  • DVD+R/RW digital video discs
  • Blu-ray is the name of a next-generation optical disc format. The format was developed to enable recording, rewriting and playback of high-definition television. While current optical disc technologies such as DVD, DVD-R, DVD+R, DVD-RW, DVD+RW and DVD-RAM use a red laser to read and write data, Blu-ray uses a blue laser instead. The benefit of using a blue laser is that it has a shorter wavelength than a red laser, which means that- it's possible to focus the laser beam with even greater precision. This allows data to be packed more tightly on the disc and makes it possible to fit more data on the same size disc. More information about Blu-ray can be found on the website: www.blu-ray.com.
  • NA numerical aperture
  • DVD+RW digital versatile discs
  • the numerical aperture is about 0.60. Due to this relatively large numerical aperture for both Blu-ray and DVD+R/RW applications, as well as the tolerances in the alignment of optical components in an optical pickup unit (OPU), there is a need to have two different tilt positions of the objective lens for playing Blu-ray and DVD+R/RW discs.
  • the optimal tilt position of the objective lens to obtain the best jitter is called best angle.
  • the best angle in the beta (radial) direction is corrected by the tilt movement in a 3D actuator.
  • the existing solution corrects the alpha best angle at the mechanism level using a mechanism with a tilting frame.
  • the tilting frame corrects the tilt angle in the alpha direction while the 3D actuator corrects the tilt angle in the beta ( ⁇ ) direction.
  • the construction and the method of the control of the tilting frame are expensive.
  • JP -2003288728 discloses dual screw- and spring arrangements that are used to tilt an objective lens in a pickup part with respect to an optical disc.
  • the screw- and spring arrangements are installed at both end parts of a pickup guide enabling the pickup part to be tilted in a third and fourth direction.
  • JP-2003228852 discloses a 3D- tilt arrangement for tilting an objective lens in an optical pickup.
  • the tilt arrangement comprises an actuator having a tapered section enabling the pickup unit to be tilted in a third direction, and where a screw can adjust the actuator.
  • None of the prior art discloses a tilt arrangement that enables an optical pickup unit to have at least two distinct alpha tilt positions that are adjustable in the production of the optical pickup unit.
  • the object of the present invention is to provide an arrangement for an optical pickup unit that enables 4D-tilting of an objective lens of the optical pickup unit and that provides two distinct alpha tilt positions in respect of a fourth direction.
  • an optical pickup unit having an objective lens for reading on digital discs provided with an actuator for acting on a box holding the objective lens, where the optical pickup unit is provided with an additional actuator pivotally arranged in relation to the box for tilting the lens in an additional direction, the additional actuator comprising mechanical means arranged on a frame of the optical pickup unit for tilting the additional actuator between at least two tilt positions.
  • This invention is a low cost solution to the problem of the alpha best angle position, by enabling the optical pickup unit to have two distinct alpha tilt positions that are adjustable in the production of the optical pickup unit.
  • Fig. 1 is a view of an embodiment of an optical pickup unit according to the present invention
  • Fig. 2 shows a first tilt position of an actuator in an optical pickup unit according to the present invention
  • Fig. 3 shows a second tilt position of an actuator in of an optical pickup unit according to the present invention.
  • the optical pickup unit 1 for reading and/or writing on a DVD- and/or Blu-ray disc.
  • the optical pickup unit 1 includes a frame 2 and an actuator 3.
  • the actuator 3 can be tilted in relation to the frame 2 to achieve different alpha tilt positions of an objective lens 4 for reading and/or writing of the discs that is contained within the actuator 3.
  • the objective lens 4 is contained in a tilt box 5 that is hinged in the actuator 3 to enable a tangential rotation or tilting of the objective lens 4 in relation to the actuator 3 and the optical pickup unit 1.
  • a standard 3D-actuator is contained within the actuator of the optical pickup unit to control the x, y and beta (radial) positions of the objective lens.
  • Such 3D-actuators are well known in the art, see e.g. the Philips OPU66.20, and will therefore not be described here.
  • Other types of actuators can of course be used as long as the same effect is achieved.
  • the tilt box 5 is on one side provided with an arm 6, extending substantially perpendicular in relation to the moving direction of the optical pickup unit 1 and through a side wall of the actuator 3.
  • the arm 6 is provided with a wedged slot 7 on its underside and a steel stub 8 arranged at the free end of the arm 6.
  • the steel stub 8 extends along an axis parallel to the longitudinal direction of the arm 6 and extending through a yoke 9 arranged on the frame 2 of the optical pickup unit 1.
  • the yoke 9 is adjustable so that the height of the opening of the yoke 9 can be varied in relation to the frame 2.
  • a permanent magnet 10 is arranged at the bottom of the yoke 9, whereon the steel stub 8 rests in a first tilt position ⁇ l and where the magnet 10 keeps the steel stub 8 in the first position ⁇ l.
  • the height of the magnet 10 in relation to the frame 2 is similarly to the yoke 9 adjustable, thereby changing the first tilt position ⁇ l.
  • the tilt box 5 is provided at a side opposite to the side, where the arm 6 extends, with a preloaded spring 11.
  • the spring 11 tilts the tilt box 5 and the steel stub 8 into a second tilt position ⁇ 2, when the steel stub 8 is lifted from the magnet 10 by mechanical means, which will be described below, to push against the top of the yoke 9.
  • the mechanical means for lifting the steel stub 8 from its first tilt position ⁇ l to its second tilt position ⁇ 2 comprises a wedge 12 and a wedge 13, which are arranged along the motion path 14 of the optical pickup unit 1, shown in fig. 1.
  • the motion path 14 of the optical pickup unit 1 includes two end positions, i.e. a home position (rest position) A and an out position (outer-most diameter position) B. At the home position A the wedge 12 is arranged, and at the out position B the wedged 13 is arranged.
  • the wedge 12 interacts with the wedged slot 7 of the arm 6 to lift the steel stub 8 and accordingly also the actuator 3 from its first tilt position ⁇ l to its second tilt position ⁇ 2.
  • the spring 11 secures that the steel stub 8 and the actuator 3 are maintained in the second tilt position ⁇ 2 as long as needed.
  • the wedge 13 interacts with a wedged surface 15 (partially shown in fig. 1) on the tilt box 5 to push the steel stub 8 and the actuator 3 from its second tilt position ⁇ 2 to its first tilt position ⁇ l.
  • ⁇ 2 can be controlled via application software incorporated in the apparatus, where the optical pickup unit 1 is included.
  • the optical pickup unit 1 is moved to the home position A.
  • the reset wedge 12 at the home position A releases the steel stub 8 from its first tilt position ⁇ l on the permanent magnet 10.
  • the optical pickup unit 1 is moved to the outer-most diameter position B.
  • the wedge 13 at the outer-most diameter position B pushes the actuator 3 back to its first tilt position ⁇ l on the magnet 10.
  • the best tangential tilt position ⁇ l of the objective lens 4 for Bl ⁇ -ray discs is adjusted by the height of the magnet 10.
  • the height of the magnet 10 determines the first tilt position ⁇ l.
  • the actuator 3 is shown with the steel stub 8 resting on the magnet 10.
  • a reset wedge 12 lifts up the steel stub 8 from the magnet 10 and the preloaded spring helps the steel stub 8 to place itself and the actuator 3 in the second tilt position ⁇ 2.
  • the height of the yoke 9 controls the second tilt position ⁇ 2. Adjusting the height of the yoke 9 in the production determines the best tangential tilt position ⁇ 2 for DVD/DVD+RW discs.
  • the actuator 3 can be secured in the second tilt position ⁇ 2 with a yoke 9 that is magnetized by the magnet 10. Both the magnet 10 and the yoke 9 will be glued permanently after all adjustments to set the two tilt positions ⁇ l, ⁇ 2.
  • Both wedge 12 at the home position A and wedge 13 at the out position B are designed to be flexible. This is to minimize stress on the actuator 3 assembly while toggling between the two tilt positions.
  • the beta (radial) position of the objective lens 4 will be affected only marginally by the toggling between the tilt positions ⁇ l, ⁇ 2.
  • This invention can be applied to optical pickup units that have both read and write capability for both Blu-ray (or any other blue laser optical disc storage standards) applications and DVD+R/RW (or any other red laser standards like -R/RW, RAM) applications.
  • This invention enables the optical pickup unit to have two distinct alpha tilt positions to obtain the best jitter when playing Blu-ray and DVD+R/RW discs, at a very low cost of implementation.
  • the invention should, however, not be limited two toggling between two alpha tilt positions, but it should be possible to have further alpha tilt positions.

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
  • Optical Head (AREA)

Abstract

This invention enables the optical pickup unit 1 to have two distinct tangential tilt positions α1, α2 that are adjustable in the production of the optical pickup unit 1. The tangential tilt positions α1, α2 are easily switched from one to another and vice versa, either by moving the optical pickup unit 1 to the home position A or by moving the optical pickup unit 1 to out-most diameter position B.

Description

An arrangement for an optical pickup unit
The invention relates to an optical arrangement in an electronic apparatus, and more particularly to an optical arrangement in digital recording and playing discs such as DVD and Blu-ray discs.
In the application reference will be made to DVD and Blu-ray. These technologies are briefly discussed below.
DVD or DVD-ROM (digital video discs) is an optical disc storage technology that includes recordable variations: DVD-R/RW, DVD-RAM and DVD+R/RW. It is frequently used for different applications such as video, audio, photos and computer data.
Blu-ray is the name of a next-generation optical disc format. The format was developed to enable recording, rewriting and playback of high-definition television. While current optical disc technologies such as DVD, DVD-R, DVD+R, DVD-RW, DVD+RW and DVD-RAM use a red laser to read and write data, Blu-ray uses a blue laser instead. The benefit of using a blue laser is that it has a shorter wavelength than a red laser, which means that- it's possible to focus the laser beam with even greater precision. This allows data to be packed more tightly on the disc and makes it possible to fit more data on the same size disc. More information about Blu-ray can be found on the website: www.blu-ray.com.
In Blu-ray applications, the numerical aperture (NA) is about 0.85. In DVD+RW applications, the numerical aperture is about 0.60. Due to this relatively large numerical aperture for both Blu-ray and DVD+R/RW applications, as well as the tolerances in the alignment of optical components in an optical pickup unit (OPU), there is a need to have two different tilt positions of the objective lens for playing Blu-ray and DVD+R/RW discs.
The optimal tilt position of the objective lens to obtain the best jitter is called best angle. The best angle in the beta (radial) direction is corrected by the tilt movement in a 3D actuator. Presently, there is no actuator that is able to make tilt corrections in alpha (tangential) direction.
The existing solution corrects the alpha best angle at the mechanism level using a mechanism with a tilting frame. The tilting frame corrects the tilt angle in the alpha direction while the 3D actuator corrects the tilt angle in the beta (β) direction. The construction and the method of the control of the tilting frame are expensive.
One example of a prior art solution is shown in JP -2003288728, which discloses dual screw- and spring arrangements that are used to tilt an objective lens in a pickup part with respect to an optical disc. The screw- and spring arrangements are installed at both end parts of a pickup guide enabling the pickup part to be tilted in a third and fourth direction. Another prior art solution is shown in JP-2003228852, which discloses a 3D- tilt arrangement for tilting an objective lens in an optical pickup. The tilt arrangement comprises an actuator having a tapered section enabling the pickup unit to be tilted in a third direction, and where a screw can adjust the actuator.
None of the prior art discloses a tilt arrangement that enables an optical pickup unit to have at least two distinct alpha tilt positions that are adjustable in the production of the optical pickup unit.
The object of the present invention is to provide an arrangement for an optical pickup unit that enables 4D-tilting of an objective lens of the optical pickup unit and that provides two distinct alpha tilt positions in respect of a fourth direction.
This object is achieved by an arrangement for an optical pickup unit having an objective lens for reading on digital discs provided with an actuator for acting on a box holding the objective lens, where the optical pickup unit is provided with an additional actuator pivotally arranged in relation to the box for tilting the lens in an additional direction, the additional actuator comprising mechanical means arranged on a frame of the optical pickup unit for tilting the additional actuator between at least two tilt positions.
This invention is a low cost solution to the problem of the alpha best angle position, by enabling the optical pickup unit to have two distinct alpha tilt positions that are adjustable in the production of the optical pickup unit.
These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments) described hereinafter. The invention will be explained more in detail below, by way of example, in connection with preferred embodiments and with reference to the drawings, in which:
Fig. 1 is a view of an embodiment of an optical pickup unit according to the present invention; Fig. 2 shows a first tilt position of an actuator in an optical pickup unit according to the present invention; and
Fig. 3 shows a second tilt position of an actuator in of an optical pickup unit according to the present invention.
With reference to figure 1 is shown an optical pickup unit 1 for reading and/or writing on a DVD- and/or Blu-ray disc. The optical pickup unit 1 includes a frame 2 and an actuator 3. The actuator 3 can be tilted in relation to the frame 2 to achieve different alpha tilt positions of an objective lens 4 for reading and/or writing of the discs that is contained within the actuator 3. The objective lens 4 is contained in a tilt box 5 that is hinged in the actuator 3 to enable a tangential rotation or tilting of the objective lens 4 in relation to the actuator 3 and the optical pickup unit 1.
It is assumed that a standard 3D-actuator is contained within the actuator of the optical pickup unit to control the x, y and beta (radial) positions of the objective lens. Such 3D-actuators are well known in the art, see e.g. the Philips OPU66.20, and will therefore not be described here. Other types of actuators can of course be used as long as the same effect is achieved.
The tilt box 5 is on one side provided with an arm 6, extending substantially perpendicular in relation to the moving direction of the optical pickup unit 1 and through a side wall of the actuator 3. The arm 6 is provided with a wedged slot 7 on its underside and a steel stub 8 arranged at the free end of the arm 6. The steel stub 8 extends along an axis parallel to the longitudinal direction of the arm 6 and extending through a yoke 9 arranged on the frame 2 of the optical pickup unit 1.
The yoke 9 is adjustable so that the height of the opening of the yoke 9 can be varied in relation to the frame 2. A permanent magnet 10 is arranged at the bottom of the yoke 9, whereon the steel stub 8 rests in a first tilt position αl and where the magnet 10 keeps the steel stub 8 in the first position αl. The height of the magnet 10 in relation to the frame 2 is similarly to the yoke 9 adjustable, thereby changing the first tilt position αl. The tilt box 5 is provided at a side opposite to the side, where the arm 6 extends, with a preloaded spring 11. The spring 11 tilts the tilt box 5 and the steel stub 8 into a second tilt position α2, when the steel stub 8 is lifted from the magnet 10 by mechanical means, which will be described below, to push against the top of the yoke 9. The mechanical means for lifting the steel stub 8 from its first tilt position αl to its second tilt position α2 comprises a wedge 12 and a wedge 13, which are arranged along the motion path 14 of the optical pickup unit 1, shown in fig. 1. The motion path 14 of the optical pickup unit 1 includes two end positions, i.e. a home position (rest position) A and an out position (outer-most diameter position) B. At the home position A the wedge 12 is arranged, and at the out position B the wedged 13 is arranged.
The wedge 12 interacts with the wedged slot 7 of the arm 6 to lift the steel stub 8 and accordingly also the actuator 3 from its first tilt position αl to its second tilt position α2. The spring 11 secures that the steel stub 8 and the actuator 3 are maintained in the second tilt position α2 as long as needed. The wedge 13 interacts with a wedged surface 15 (partially shown in fig. 1) on the tilt box 5 to push the steel stub 8 and the actuator 3 from its second tilt position α2 to its first tilt position αl.
Toggling between these two tilt positions αl, α2 can be controlled via application software incorporated in the apparatus, where the optical pickup unit 1 is included. ! To switch from the first tilt position αl to the second tilt position α2, the optical pickup unit 1 is moved to the home position A. The reset wedge 12 at the home position A releases the steel stub 8 from its first tilt position αl on the permanent magnet 10. To switch from the second tilt position α2 back to the first tilt position αl, the optical pickup unit 1 is moved to the outer-most diameter position B. The wedge 13 at the outer-most diameter position B pushes the actuator 3 back to its first tilt position αl on the magnet 10. The best tangential tilt position αl of the objective lens 4 for Blμ-ray discs is adjusted by the height of the magnet 10. The height of the magnet 10 determines the first tilt position αl. In Fig. 2, the actuator 3 is shown with the steel stub 8 resting on the magnet 10. When the optical pickup unit 1 moves to home position A, a reset wedge 12 lifts up the steel stub 8 from the magnet 10 and the preloaded spring helps the steel stub 8 to place itself and the actuator 3 in the second tilt position α2. The height of the yoke 9 controls the second tilt position α2. Adjusting the height of the yoke 9 in the production determines the best tangential tilt position α2 for DVD/DVD+RW discs. The actuator 3 can be secured in the second tilt position α2 with a yoke 9 that is magnetized by the magnet 10. Both the magnet 10 and the yoke 9 will be glued permanently after all adjustments to set the two tilt positions αl, α2.
Both wedge 12 at the home position A and wedge 13 at the out position B are designed to be flexible. This is to minimize stress on the actuator 3 assembly while toggling between the two tilt positions.
The beta (radial) position of the objective lens 4 will be affected only marginally by the toggling between the tilt positions αl, α2.
This invention can be applied to optical pickup units that have both read and write capability for both Blu-ray (or any other blue laser optical disc storage standards) applications and DVD+R/RW (or any other red laser standards like -R/RW, RAM) applications.
This invention enables the optical pickup unit to have two distinct alpha tilt positions to obtain the best jitter when playing Blu-ray and DVD+R/RW discs, at a very low cost of implementation. The invention should, however, not be limited two toggling between two alpha tilt positions, but it should be possible to have further alpha tilt positions.
The use of reference signs in the claims should not be construed as limiting the scope.
The present invention should not be limited to the shown embodiments; several modifications within the scope of the appended claims are possible.

Claims

CLAIMS:
1. An arrangement for an optical pickup unit (1) having an objective lens (4) for reading on digital discs provided with an actuator for acting on a box (5) holding the objective lens (4), characterized in that the optical pickup unit (1) is provided with an additional actuator (3) pivotally arranged in relation to the box (5) for tilting the lens (4) in an additional direction (α), the additional actuator (3) comprising mechanical means (6, 7, 8, 9, 10, 11, 12, 13, 15) arranged on a frame (2) of the optical pickup unit (1) for tilting the lens (4) via the additional actuator (3) between at least two tilt positions (αl, α2).
2. An arrangement for an optical pickup unit (1) according to claim 1, where the actuator acts on the box (5) holding the lens (4) in at least three directions (x, y, β).
3. An arrangement for an optical pickup unit (1) according to claim 2, where the mechanical means comprise means (8, 9, 10, 11) for holding the optical pickup unit (1) in any of two tilt positions (αl, α2) and means (6, 7, 11, 12, 13, 15) for tilting the optical pickup unit (1) between the two tilt positions (αl, α2).
4. An arrangement for an optical pickup unit (1) according to claim 2, where the holding means (8, 9, 10, 11) comprise an extending part (6, 8) provided at one side of the box (5) and extending through a yoke (9), where the extending part (6, 8) takes a first tilt position (αl) by leaning towards the bottom of the yoke (9) or a second tilt position (α2) by leaning towards the top of the yoke (9).
5. An arrangement for an optical pickup unit (1) according to claim 4, where the holding means are provided with a magnet (10) at the bottom of the yoke (9) to maintain the extending part (8) in the first tilt position (αl), and with biasing means (11) to maintain the extending part (8) in the second tilt position (α2).
6. An arrangement for an optical pickup unit (1) according to claim 4 or 5, where the extending part comprises an arm (6) attached in one end to one side of the box (5) and a steel stub (8) attached to the other end of the arm (6), and where the steel stub (8) extends through the yoke (9).
7. An arrangement for an optical pickup unit (1) according to claim 5 or 6, where the biasing means is a spring (10) attached in one end to the box (5) in one side of the box (5) opposite to where the arm (6) is attached, and where the spring (10) is attached to the frame (2) of the optical pickup unit (1) in the other end.
8. An arrangement for an optical pickup unit (1) according to any of claims 5-7, where the height of the yoke (9) is adjustable so that the second tilt position (α2) can be adjusted in relation to the frame (2), and where the position of the magnet in relation to the frame (2) and the yoke (9) is adjustable so that the first tilt position (αl) can be adjusted in relation to the frame (2).
9. An arrangement for an optical pickup unit (1) according to any of claims 4-8, where the tilting means comprise a wedged slot (7) that interacts with a wedge (12) and a wedged surface (15) that interacts with a wedge (13), where the wedges (12, 13) are arranged in a superstructure surrounding the optical pickup unit (1) and along the moving path of the optical pickup unit (1).
10. An arrangement for an optical pickup unit (1) according to claim 9, where the interaction between the wedged slot (7) and the wedge (12) moves the extending part (8) from the first tilt position (αl) towards the second tilt position (α2), and where the biasing means (11) helps the extending part (8) to move into the second tilt position (α2).
11. An arrangement for an optical pickup unit (1) according to claim 10, where the interaction between the wedged surface (15) and the wedge (13) moves the extending part (8) from the second tilt position (α2) towards the first tilt position (αl), and where the magnet (10) helps the extending part (8) to move into the first tilt position (αl).
12. An arrangement for an optical pickup unit (1) according to any of claims 8-10, where the wedged slot (7) is arranged on the underside of the extending part (6), and where the wedged surface (15) is arranged at one side of the box (5) extending from the box (5) in the moving direction of the optical pickup unit (1).
13. An arrangement for an optical pickup unit (1) according to any of claims 8-11, where the wedge (12) is arranged at a home position (A) of the optical pickup unit (1) and where the wedge (13) is arranged at an out position (B) of the optical pickup unit (1).
14. An electronic appliance characterized in that an arrangement for an optical pickup unit according to any of claims 1-13 is included.
15. An optical disc drive characterized in that an arrangement for an optical pickup unit according to any of claims 1-13 is included.
16. A method of tilting an objective lens (4) included in an arrangement for an optical pickup unit (1) in an tangential direction including the following steps: moving the optical pickup unit (1) to a home position (A), where a wedge (12) is arranged to tilt a box (5) holding the objective lens (4) in a tangential direction from a first tilt position (αl) towards a second tilt position (α2), and moving the optical pickup unit (1) to an out position (B), where a wedge (13) is arranged to tilt the box holding the objective lens (4) in a tangential direction from the second tilt position (α2) towards the first tilt position (αl).
PCT/IB2005/053124 2004-10-04 2005-09-22 An arrangement for an optical pickup unit WO2006038139A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP04104843 2004-10-04
EP04104843.0 2004-10-04

Publications (1)

Publication Number Publication Date
WO2006038139A1 true WO2006038139A1 (en) 2006-04-13

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WO (1) WO2006038139A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4661943A (en) * 1984-02-27 1987-04-28 Pioneer Electroni Corporation Optical data reader
EP1271494A2 (en) * 2001-06-19 2003-01-02 Samsung Electronics Co., Ltd. Optical pickup actuator
US20030223346A1 (en) * 2002-05-31 2003-12-04 Kabushiki Kaisha Toshiba Optical disk apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4661943A (en) * 1984-02-27 1987-04-28 Pioneer Electroni Corporation Optical data reader
EP1271494A2 (en) * 2001-06-19 2003-01-02 Samsung Electronics Co., Ltd. Optical pickup actuator
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