Classifications

• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
  • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
  • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
  • G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
  • G02B7/102—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens controlled by a microcomputer
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B13/00—Optical objectives specially designed for the purposes specified below
  • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
  • G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B15/00—Optical objectives with means for varying the magnification
  • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
  • G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
  • G02B15/20—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having an additional movable lens or lens group for varying the objective focal length
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
  • H02K41/02—Linear motors; Sectional motors
  • H02K41/035—DC motors; Unipolar motors
  • H02K41/0352—Unipolar motors
  • H02K41/0354—Lorentz force motors, e.g. voice coil motors
  • H02K41/0356—Lorentz force motors, e.g. voice coil motors moving along a straight path
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
  • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
  • G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K16/00—Machines with more than one rotor or stator

Definitions

• the disclosure relates to a dual actuation system having one actuation axis, the actuation system comprising magnet and coils.
• Conventional optical zoom cameras typically comprise two moving lens groups, one for focusing and one for zooming, which utilize separate actuators, such as voice coil actuators. Both actuators are standalone units consuming a certain volume and influencing the form factor for the camera module.
• actuators such as voice coil actuators.
• Both actuators are standalone units consuming a certain volume and influencing the form factor for the camera module.
• optomechanical systems comprising deformable lenses, which require mechanical deformation, are very space consuming. This is due to required high deformation forces of several hundreds of millinewtons.
• the force generation efficiency over power consumption of most common voice coil actuators remain relatively low, resulting in the magnet and coil sizes having to be several millimeters.
• Imaging zooms for portable electronic devices have mostly been digital, which unfortunately affects the resolution of the images taken with the camera.
• Digital zoom does not add any information to image, but comprises only cropping and scaling a portion of original image to larger size.
• Optical zoom magnifies the target using lenses and provides more details in the original resolution, providing a better resolution image.
• a dual actuation system having one actuation axis, the actuation system comprising a first magnet, a second magnet, a first coil, and a second coil, the first magnet, the second magnet, the first coil, and the second coil being arranged in an at least partially overlapping arrangement in a direction perpendicular to the actuation axis, and wherein manipulating electrical current in the first coil generates a first movement along the actuation axis and manipulating electrical current in the second coil generates a second movement along the actuation axis, the first movement and the second movement being generated independently of each other.
• this solution facilitates a very compact dual actuation system.
• the dual actuation system has a relatively narrow or thin shape, minimizing width or the height of the optomechanical system, as well as a reasonable length which, typically, a relatively long optical zoom module can accommodate.
• Such an actuator combination into one standalone unit also reduces costs.
• the first magnet and the second magnet are stationarily arranged along the actuation axis, and the first coil and the second coil are moveable along the actuation axis in relation to the first magnet and the second magnet, or the first coil and the second coil are stationarily arranged along the actuation axis, and the first magnet and the second magnet are moveable along the actuation axis in relation to the first coil and the second coil.
• the first magnet and the second magnet are separated by a first gap in a direction perpendicular to the actuation axis, one of the first coil and the second coil being arranged within the first gap, or the first coil and the second coil are separated by a first gap in a direction perpendicular to the actuation axis, one of the first magnet and the second magnet being arranged within the first gap.
• the dual actuation system further comprises a third magnet or a third coil, being arranged in an at least partially overlapping arrangement with the first magnet, the second magnet, the first coil, and the second coil in the direction perpendicular to the actuation axis, the second magnet and the third magnet, or the second coil and the third coil, being separated by a second gap in the direction.
• first coil and the second coil, or the first magnet and the second magnet are arranged within the first gap, facilitating a very narrow and/or very thin dual actuation system requiring as little volume as possible.
• the first coil is arranged within the second gap.
• the electrical current generates a first electromagnetic field on both sides of the first coil, the first electromagnetic field generating a first electromotive force between the first coil and the first magnet and the second magnet, or between the first coil and the second magnet and the third magnet.
• the electrical current generates a second electromagnetic field on both sides of the second coil, the second electromagnetic field generating a second electromotive force between the second coil and the first magnet and the second magnet.
• the electrical current generates a first electromagnetic field on both sides of the first coil, the first electromagnetic field generating a first electromotive force between the first coil, the second magnet, and the third magnet, and generating a second electromagnetic field on both sides of the second coil, the second electromagnetic field generating a second electromotive force between the second coil, the first magnet, and the second magnet, facilitating a very narrow dual actuation system requiring as little volume as possible.
• the dual actuation system comprises the third magnet, the third coil and a fourth coil, the first coil and the third coil being interconnected to move simultaneously in the first movement, the second coil and the fourth coil being interconnected to move simultaneously in the second movement, the first coil and the second coil being arranged within the first gap, and the third coil and the fourth coil being arranged within the second gap, facilitating a dual actuation system which generates as much operational force as possible.
• the electrical current generates a first electromagnetic field on both sides of the first coil, and a second electromagnetic field on both sides of the second coil, the first electromagnetic field and the second electromagnetic field generating a first electromotive force between the first magnet, the first coil, and the second coil, and a second electromotive force between the second magnet, the first coil, and the second coil, facilitating a very thin dual actuation system requiring as little volume as possible.
• the dual actuation system comprises the third coil, the third magnet, and a fourth magnet, the first magnet and the third magnet being interconnected to move simultaneously in the first movement, the second magnet and the fourth magnet being interconnected to move simultaneously in the second movement, the first magnet and the second magnet being arranged within the first gap, and the third magnet and the fourth magnet being arranged within the second gap, facilitating a dual actuation system which generates as much operational force as possible.
• the first movement and the second movement are generated simultaneously.
• the first movement and the second movement are generated in the same direction along the actuation axis and/or in opposite directions along the actuation axis.
• an optomechanical system comprising at least a first lens, a second lens and the dual actuation system according to the above, the actuation axis of the dual actuation system extending in parallel with an optical axis of the first lens and the second lens, one of the first magnet and the first coil being interconnected with the first lens such that first movement generated within the dual actuation system moves the first lens along the optical axis, one of the second magnet and the second coil being interconnected with the second lens such that second movement generated within the dual actuation system moves the second lens along the optical axis.
• This solution facilitates a very compact optomechanical system.
• the form factor of the optomechanical system and electronic device into which it is arranged is influenced positively.
• one of the third magnet and the third coil is interconnected with the first lens such that first movement generated within the dual actuation system moves the first lens along the optical axis, one of the fourth magnet and the fourth coil being interconnected with the second lens such that second movement generated within the dual actuation system moves the second lens along the optical axis, facilitating an optomechanical system utilizing as much operational force as possible.
• an electronic device comprising the optomechanical system according to the above.
• the reduced volume of the dual actuation system and the optomechanical system frees up space within the electronic device which may be used for additional hardware elements such as additional cameras.
• Fig. 1 shows a schematic cross-sectional side view of an optomechanical system comprising a dual actuation system in accordance with one embodiment of the present invention
• Fig. 2 shows a schematic cross-sectional side view of an optomechanical system comprising a dual actuation system in accordance with one embodiment of the present invention
• Fig. 3 shows a schematic cross-sectional side view of an optomechanical system comprising a dual actuation system in accordance with one embodiment of the present invention
• Fig. 4 shows a schematic cross-sectional side view of an optomechanical system comprising a dual actuation system in accordance with one embodiment of the present invention
• Fig. 5 shows a schematic cross-sectional side view of an optomechanical system comprising a dual actuation system in accordance with one embodiment of the present invention.
• the present invention relates to a dual actuation system 1 having one common actuation axis A.
• the actuation system 1 comprises at least a first magnet 2, a second magnet 3, a first coil 4, and a second coil 5.
• the first magnet 2, the second magnet 3, the first coil 4, and the second coil 5 are arranged in an at least partially overlapping arrangement in a direction perpendicular to the actuation axis A.
• the actuation system 1 is operated by manipulating electrical current in the first coil 4, which generates a first movement Ml along the actuation axis A, and by manipulating electrical current in the second coil 5, which generates a second movement M2 along the actuation axis A.
• the first movement Ml and the second movement M2 are generated independently of each other.
• the first movement Ml and the second movement M2 may be generated simultaneously.
• the first movement Ml and the second movement M2 may be generated in the same direction along the actuation axis A and/or in opposite directions along the actuation axis A.
• Figs. 1 to 3 show embodiments wherein the first magnet 2 and the second magnet 3 are stationarily arranged along the actuation axis A, and the first coil 4 and the second coil 5 are moveable along the actuation axis A in relation to the first magnet 2 and the second magnet 3.
• the first magnet 2 and the second magnet 3 may be separated by a first gap 6 in a direction perpendicular to the actuation axis A, and one of the first coil 4 and the second coil 5 may be arranged within the first gap 6.
• both the first coil 4 and the second coil 5 may be arranged within the first gap 6.
• the dual actuation system 1 may further comprise a third magnet 7 arranged in an at least partially overlapping arrangement with the first magnet 2, the second magnet 3, the first coil 4, and the second coil 5 in the direction perpendicular to the actuation axis A.
• the second magnet 3 and the third magnet 7 may be separated by a second gap 10 in the direction perpendicular to the actuation axis A.
• the first coil 4 may be arranged within the second gap 10.
• the electrical current may generate a first electromagnetic field on both sides of the first coil 4, the first electromagnetic field generating a first electromotive force between the first coil 4 and the first magnet 2 and the second magnet 3, or between the first coil 4 and the second magnet 3 and the third magnet 7.
• the electrical current may also generate a second electromagnetic field on both sides of the second coil 5, the second electromagnetic field generating a second electromotive force between the second coil 5 and the first magnet 2 and the second magnet 3.
• Fig. 3 shows an embodiment wherein the dual actuation system 1 comprises the third magnet 7, the third coil 8 and a fourth coil 9.
• the first coil 4 and the third coil 8 are interconnected to move simultaneously in the first movement Ml .
• the second coil 5 and the fourth coil 9 are interconnected to move simultaneously in the second movement M2. Furthermore, the first coil 4 and the second coil 5 are arranged within the first gap 6, and the third coil 8 and the fourth coil 9 are arranged within the second gap 10.
• Fig. 1 shows an embodiment wherein the electrical current generates a first electromagnetic field on both sides of the first coil 4, the first electromagnetic field generating a first electromotive force between the first coil 4, the second magnet 3, and the third magnet 7. Furthermore, the electrical current generates a second electromagnetic field on both sides of the second coil 5, the second electromagnetic field generating a second electromotive force between the second coil 5, the first magnet 2, and the second magnet 3.
• Figs. 4 and 5 show embodiments wherein the first coil 4 and the second coil 5 are stationarily arranged along the actuation axis A, and the first magnet 2 and the second magnet 3 are moveable along the actuation axis A in relation to the first coil 4 and the second coil 5.
• the first coil 4 and the second coil 5 may be separated by a first gap 6 in a direction perpendicular to the actuation axis A, and one of the first magnet 2 and the second magnet 3 may be arranged within the first gap 6.
• Both the first magnet 2 and the second magnet 3 may be arranged within the first gap 6.
• the electrical current may generate a first electromagnetic field on both sides of the first coil 4 and a second electromagnetic field on both sides of the second coil 5.
• the first electromagnetic field and the second electromagnetic field generate a first electromotive force between the first magnet 2, the first coil 4, and the second coil 5, and a second electromotive force between the second magnet 3, the first coil 4, and the second coil 5.
• the dual actuation system 1 may further comprise a third coil 8 arranged in an at least partially overlapping arrangement with the first magnet 2, the second magnet 3, the first coil 4, and the second coil 5 in the direction perpendicular to the actuation axis A.
• the second coil 5 and the third coil 8 may be separated by a second gap 10 in the direction perpendicular to the actuation axis A.
• the dual actuation system may comprise the third coil 8, the third magnet 7, and a fourth magnet 14.
• the first magnet 2 and the third magnet 7 are interconnected to move simultaneously in the first movement Ml.
• the second magnet 3 and the fourth magnet 14 are interconnected to move simultaneously in the second movement M2.
• the first magnet 2 and the second magnet 3 are arranged within the first gap 6, and the third magnet 7 and the fourth magnet 14 are arranged within the second gap 10.
• the present invention also relates to an optomechanical system 11 comprising at least a first lens 12, a second lens 13 and the dual actuation system 1 described above.
• the actuation axis A of the dual actuation system 1 extends in parallel with an optical axis O of the first lens 12 and the second lens 13.
• the first lens 12 and the second lens 13 may be solid injection molded lenses or be deformable optical elements made out of soft material. Furthermore, the first lens 12 may be a group comprising a plurality of lenses, and may e.g. be used for focusing, and the second lens 13 may be a group comprising a plurality of lenses, and may e.g. be used for zooming.
• One of the first magnet 2 and the first coil 4 is interconnected with the first lens 12 such that first movement Ml generated within the dual actuation system 1 moves the first lens 12 along the optical axis O.
• one of the second magnet 3 and the second coil 5 is interconnected with the second lens 13 such that second movement M2 generated within the dual actuation system 1 moves the second lens 13 along the optical axis O.
• the interconnection may be achieved by means of operating arms, as indicated in the Figs.
• One of the third magnet 7 and the third coil 8 may also be interconnected with the first lens 12 such that first movement Ml generated within the dual actuation system 1 moves the first lens 12 along the optical axis O.
• one of the fourth magnet 14 and the fourth coil 9 may also be interconnected with the second lens 13 such that second movement M2 generated within the dual actuation system 1 moves the second lens 13 along the optical axis O.
• the optomechanical system 11 may be comprised in one common housing (not shown), which housing is then arranged in an electronic device.
• the optomechanical system 11 may also comprise support structure, magnet circuitry and guiding flexures.
• the present invention also relates an electronic device, such as a smartphone, tablet, or camera, comprising the optomechanical system 11 described above.
• the reduced volume of the dual actuation system and the optomechanical system frees up space within the electronic device which may be used for additional hardware elements such as additional cameras.
• a computer program may be stored/distributed on a suitable medium, such as an optical storage medium or a solid-state medium supplied together with or as part of other hardware, but may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems.
• a suitable medium such as an optical storage medium or a solid-state medium supplied together with or as part of other hardware, but may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems.

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• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• General Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• General Engineering & Computer Science (AREA)
• Nonlinear Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Electromagnetism (AREA)
• Power Engineering (AREA)
• Lens Barrels (AREA)
• Reciprocating, Oscillating Or Vibrating Motors (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=69104353

Family Applications (1)

Country Status (3)

Family Cites Families (9)

• 2019
  • 2019-12-12 WO PCT/EP2019/084948 patent/WO2021115606A1/en unknown
  • 2019-12-12 EP EP19831617.6A patent/EP4045958A1/de active Pending
  • 2019-12-12 CN CN201980102821.7A patent/CN114766008A/zh active Pending

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