Classifications

• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
  • G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
  • G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
• • 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
  • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
  • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
  • G02B13/004—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having four lenses
• • 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
  • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
  • G02B13/0075—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having an element with variable optical properties
• • 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
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
  • H04N23/50—Constructional details
  • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
  • H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
  • H04N23/60—Control of cameras or camera modules
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
  • H04N23/60—Control of cameras or camera modules
  • H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
  • H04N23/682—Vibration or motion blur correction
  • H04N23/685—Vibration or motion blur correction performed by mechanical compensation
  • H04N23/687—Vibration or motion blur correction performed by mechanical compensation by shifting the lens or sensor position

Definitions

• Figs. 1 A and IB are a sectional perspective and exploded assembly views, respectively, of an optical lens system of the present invention employing an eiecfroactive polymer actuator configured to provide auto-focusing;
• Figs, I IA and I I B show the passne stiffness and load response, respectively, of the lens system of Figs. 7 A and 7B;
• Fig 24A is a schematic illustration of cross-section of an actuator carts idge of the lens displacement mechanism of Figs 23 ⁇ and 23B,
• Fig 284 is a side view of the rotating collar of the shutter aperture mechanism of Fig 28,
• Figs 32A and 32B illusttate side ⁇ icvx s of anothet lens displacement mechanism of the ptesent imenuon which employs- a iinitnoiph jctuatoi.
• Fig 34 shows a cross-seettona! v iew of a lens displacement svstem of the present invention employing anothet configuration foi addtcssmg ambient conditions, Fsgs 34 ⁇ and 34B arc pcispective and top v iew* of a the ambient condition conttol mechanism of the system of
• Fig U Fig. 35 shows a cross-sectional view of another lens displacement sy stem of the present imcntion ing a lens position sensor.
• Figs 1 ⁇ and IB illustrate an optical lens system of the present i mention ha ⁇ ing auto-focus capabilities '
• the figures detail a lens module I 00 has ing a lens barrel 108 holding one OF more lenses (not shown)
• Positioned distalK' of aperture 106 is an eiectroactive polymer (EAP) actuator 102 ing an electroact ⁇ c polymer film 12 ( K Film 120 sandv.
• EAP eiectroactive polymer
• this deflection mav be used to produce mechanical work.
• the electroaet ⁇ c film 2 ma> be pre-straincd within flic frame to improv e conv crsion between electrical and mechanical energy, i.e., the prc-strain allows the film to deflect more and provide gx eater mechanical work
• [001 Sj Classes of electroactive polymer materials suitable for use ⁇ ith the subject optical stems include but are not limited to dielectric elastomers, eleetrostrietive polymers, electronic electroaetive polymers, and ionic cleetroactrvc polymers, and some copolv rners.
• Suitable dielectric materials include but are not limited to silicone, acrylic, poiyurethane, flourosilieone, etc blectJOstrictive poljmers are characterized b> the non-linear reaction of electroactiv e polymers.
• Electronic electroactive polymers typically change shape or dimensions due to migration of electrons in response to electric field (usually dry).
• EAP film 338 comprises elastomerie layer 342 and electrically isolated electrodes 340 which each extend over a portion of elastomer 342 while ing a central portion 362a of laser 342 free of electrode material
• EAP film 348 includes clastomcric layer 352 and a stnylc gioimd electrode 350
• the annular shape of yroand electrode 350 enables apposition to each hot cleetiode 340 and leaves a central portion 362b free of electrode material which matches that of portion 362a of film 338
• the two films provide a transducer mu four aet ⁇ e quadrants ⁇ i.e., having four electrode pairs) to pros sde a four- phase aciuaior, however, more or fewer acm e portions may be employed, as discussed below with respect to Figs.
• Actuator 310 also includes two disks 356, 358, one centralis positioned on each stde of the composite film structure
• Disk 356 acts as a el stop — ⁇ iting Gim 338 from contacting the back plate and acts as a supplemental bearing support to rhe sensor.
• Lens s> steni 470 of Fig P-V employs a single-phase attuatot computing snoei and outer frame members 474, 4 ⁇ 6, sespeetn eiv, w rth an FAP film 4 ⁇ H sts etched Therebetween Lens 4?2 is positioned and fixed concents icallv within mnes fiamc 4 7 4 such that the output mov ement the actuator is directh imposed on lens 472
• the single-phase actuator is biased in the dnection tow aid the fiont side 4 ⁇ 23 of the icns bj a eosnpaet coil spi ing 480 positioned within the frustum spaee defined betw eeti it ⁇ iei frame 4 " f> and a back plate 482 flic tattet acts as haid stop at a maximum * macro" (near focus) position
• the actuator is in lhc k off" stale
• Mechanical portion 554 of displacement svstem 550 includes first and second driver plates or platforms 560, 564 interconnected by linkage pairs 566a, 566b and 568a, 568b Hach of the plates has a centra! opening to hold and earn, a lens (not shown) which, collectively , proude an afocal lens assembl) which, when moved along the focal axis, adjusts the magnification of the focal lens (not shown), w hich is ccntralh -disposed in lens opening 578 within top housing 574 While only two zoom displacement plates are prm ided, any number of plates and corresponding lenses may be employed.
• Zi prov ides a cross-sectional ⁇ tew of another hybrid (actuatot -linkage) lens displacement mechanism 580 of the present invention in which the actuator portion 582 includes a single FAP transducer 584 biased upward along the optical axis 58H by a coil spring 586.
• any spring bias means e g., leaf spring > mav be employ ed
• output member 704 undcigoes a porel> ltneai displacement in the axial direction, as iHusttatcd in Fig 2C J he magnitude of this imeai displacement ma ⁇ be contiolled bj icgiilating the ⁇ okage applied to ail phases OF selecting the iclatn e mimbei of film portions that are actuated at the same time j 0066] ⁇ he ps esent foi use ⁇ tth imaging optica!
• Actuator 856 comprises a two-phase EAP film 860a, 860b configuration, similar to that actuator 710 of Fig. 28, extending between outer and inner frame members 858a. 858b, respectively.
• the free end of tab 850 is mechanically coupled to inner frame member 85Sb.
• Lens displacement mechanism 760 of Figs 32 A and 32B also employs a nmmorph film actuator.
• S>stcm "60 includes a lens barrel or assembly 762 mounted to lens carriage 764 u htch rides on guide rails 766
• Actuator 770 comprises folded or stacked unmiorph film sheets coupled together ni series fashion. Io the illisstiated embodiment each unimorph sheet is constructed with the more flexible side 772a facing ihe lens barrel and the stiffer side " "72b facing aw ay from the lens barrel, hut the re ⁇ erse orientation max be employed as well.
• the stack is at its most compressed to position, i.e., lens barrel 762 is in the most proximal position, as illustrated in Fig. 32 ⁇ .
• this position provides the greatest focal length whereas, in the context of an afoeai lens assembly , the zoom lens is in the macro position Actuation of one or more sheets 772, Cither coiiecm eh or independently, displaces lens barrel 762 in the direction of arrow 765 to adjust the focus and or magnification of the lens system
• Arrows 78K show the annular current path provided by the electrode arrangement which uses the entire ground cicctiode " S2 as a resistne heating element [0076
• Fig. 33B illustrates another LAP actuator 7* ) 0 which empkn s a parallel electrode arrangement for the heating function.
• This view shows the ground side of the actuator with ground electrode pattern 7S>2 with the high v oltage electrode pattern 784 shown in phantom from the other side of actuator TsK).
• Lugs ?%a and 7 ⁇ >b establish electrical connections, respcct ⁇ cly, to the ground and high ⁇ nltagc inputs from ⁇ he s ⁇ stem's power supph (not shown) for operating the actuator
• Parallel bus bars ?°8a. ? ⁇ 8b are provided on the ground side of actuator ?W for connection to the ground and low ⁇ oltagc inputs, respecth eh, from the power supply (not shown)
• Arrow s KOO illustrate the radial path of the current established by the parallel electrode arrangement Using the electrode in a parallel as opposed to series fashion allows for the use of a lower voltage to achiex e the current flow necessary to induce heating of the film.

Priority Applications (3)

Applications Claiming Priority (6)

Publications (1)

Family

ID=40755871

Family Applications (1)

Country Status (5)

Cited By (19)

Families Citing this family (22)

Citations (3)

Family Cites Families (10)

• 2008
  • 2008-12-10 JP JP2010538141A patent/JP5697986B2/ja active Active
  • 2008-12-10 KR KR1020107015288A patent/KR20100116584A/ko not_active Application Discontinuation
  • 2008-12-10 WO PCT/US2008/086293 patent/WO2009076477A1/en active Application Filing
  • 2008-12-10 CN CN2008801256304A patent/CN101925836B/zh active Active
  • 2008-12-10 EP EP08860457A patent/EP2223169A4/en not_active Withdrawn

Patent Citations (3)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events