WO2019169069A2 - Modules de caméra comprenant des lentilles liquides - Google Patents

Modules de caméra comprenant des lentilles liquides Download PDF

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Publication number
WO2019169069A2
WO2019169069A2 PCT/US2019/019943 US2019019943W WO2019169069A2 WO 2019169069 A2 WO2019169069 A2 WO 2019169069A2 US 2019019943 W US2019019943 W US 2019019943W WO 2019169069 A2 WO2019169069 A2 WO 2019169069A2
Authority
WO
WIPO (PCT)
Prior art keywords
housing
camera module
liquid lens
void
bore
Prior art date
Application number
PCT/US2019/019943
Other languages
English (en)
Other versions
WO2019169069A3 (fr
Inventor
David Francis Dawson-Elli
Raymond Miller Karam
Original Assignee
Corning Incorporated
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 Corning Incorporated filed Critical Corning Incorporated
Publication of WO2019169069A2 publication Critical patent/WO2019169069A2/fr
Publication of WO2019169069A3 publication Critical patent/WO2019169069A3/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/004—Optical devices or arrangements for the control of light using movable or deformable optical elements based on a displacement or a deformation of a fluid
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/004—Optical devices or arrangements for the control of light using movable or deformable optical elements based on a displacement or a deformation of a fluid
    • G02B26/005—Optical devices or arrangements for the control of light using movable or deformable optical elements based on a displacement or a deformation of a fluid based on electrowetting
    • 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
    • G02B7/028—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation

Definitions

  • This disclosure relates to liquid lenses and camera modules comprising liquid lenses.
  • Liquid lenses generally include two immiscible liquids disposed within a chamber. Varying the electric field to which the liquids are subjected can vary the wettability of one of the liquids with respect to the chamber wall, thereby varying the shape of the meniscus formed between the two liquids.
  • a camera module comprising a housing comprising a void extending in a transverse direction that is transverse to an optical axis.
  • a liquid lens is disposed within the void.
  • An electrical coupling is disposed on a surface of the liquid lens and received within a notch of the housing.
  • FIG. 1 is a schematic cross-sectional view of some embodiments of a liquid lens.
  • FIG. 2 is a schematic front view of the liquid lens of FIG. 1 looking through a first outer layer of the liquid lens.
  • FIG. 3 is a schematic rear view of the liquid lens of FIG. 1 looking through a second outer layer of the liquid lens.
  • FIG. 4 is a perspective view of some embodiments of a camera module comprising a liquid lens.
  • FIG. 5 is a schematic cross-sectional view of the camera module of FIG. 4.
  • FIG. 6 is a schematic cross-sectional view of some embodiments of a housing of a camera module, without a lens system disposed therein.
  • FIG. 7 is a perspective view of some embodiments of a liquid lens with an electrical coupling connected thereto.
  • FIG. 8 is a stress map representing the von Mises stress, or equivalent tensile stress, Ov, throughout some embodiments of the housing upon application of a load to an upper surface of the housing.
  • FIG. 1 is a schematic cross-sectional view of some embodiments of a liquid lens 100.
  • liquid lens 100 comprises a lens body 102 and a cavity 104 formed in the lens body.
  • a first liquid 106 and a second liquid 108 are disposed within cavity 104.
  • first liquid 106 is a polar liquid or a conducting liquid.
  • second liquid 108 is a non-polar liquid or an insulating liquid.
  • first liquid 106 and second liquid 108 are substantially immiscible with each other and have different refractive indices such that an interface 110 between the first liquid and the second liquid forms a lens.
  • first liquid 106 and second liquid 108 have substantially the same density, which can help to avoid changes in the shape of interface 110 as a result of changing the physical orientation of liquid lens 100 (e.g., as a result of gravitational forces).
  • cavity 104 comprises a first portion, or headspace
  • second portion 104B of cavity 104 is defined by a bore in an intermediate layer of liquid lens 100 as described herein.
  • first portion 104A of cavity 104 is defined by a recess in a first outer layer of liquid lens 100 and/or disposed outside of the bore in the intermediate layer as described herein.
  • at least a portion of first liquid 106 is disposed in first portion 104A of cavity 104.
  • second liquid 108 is disposed within second portion 104B of cavity 104.
  • substantially all or a portion of second liquid 108 is disposed within second portion 104B of cavity 104.
  • the perimeter of interface 110 e.g., the edge of the interface in contact with the sidewall of the cavity
  • Interface 110 can be adjusted via electrowetting.
  • a voltage can be applied between first liquid 106 and a surface of cavity 104 (e.g., an electrode positioned near the surface of the cavity and insulated from the first liquid as described herein) to increase or decrease the wettability of the surface of the cavity with respect to the first liquid and change the shape of interface 110.
  • adjusting interface 110 changes the shape of the interface, which changes the focal length or focus of liquid lens 100. For example, such a change of focal length can enable liquid lens 100 to perform an autofocus function. Additionally, or alternatively, adjusting interface 110 tilts the interface relative to an optical axis 112 of liquid lens 100.
  • tilting can enable liquid lens 100 to perform an optical image stabilization (OIS) function.
  • Adjusting interface 110 can be achieved without physical movement of liquid lens 100 relative to an image sensor, a fixed lens or lens stack, a housing, or other components of a camera module in which the liquid lens can be incorporated.
  • OIS optical image stabilization
  • lens body 102 of liquid lens 100 comprises a first window 114 and a second window 116.
  • cavity 104 is disposed between first window 114 and second window 116.
  • lens body 102 comprises a plurality of layers that cooperatively form the lens body.
  • lens body 102 comprises a first outer layer 118, an intermediate layer 120, and a second outer layer 122.
  • intermediate layer 120 comprises a bore formed therethrough.
  • First outer layer 118 can be bonded to one side (e.g., the object side) of intermediate layer 120.
  • first outer layer 118 is bonded to intermediate layer 120 at a bond 134A.
  • Bond 134A can be an adhesive bond, a laser bond (e.g., a laser weld), or another suitable bond capable of maintaining first liquid 106 and second liquid 108 within cavity 104.
  • second outer layer 122 can be bonded to the other side (e.g., the image side) of intermediate layer 120.
  • second outer layer 122 is bonded to intermediate layer 120 at a bond 134B and/or a bond 134C, each of which can be configured as described herein with respect to bond 134A.
  • intermediate layer 120 is disposed between first outer layer 118 and second outer layer 122, the bore in the intermediate layer is covered on opposing sides by the first outer layer and the second outer layer, and at least a portion of cavity 104 is defined within the bore.
  • first outer layer 118 covering cavity 104 serves as first window 114
  • second outer layer 122 covering the cavity serves as second window 116.
  • cavity 104 comprises first portion 104A and second portion 104B.
  • second portion 104B of cavity 104 is defined by the bore in intermediate layer 120, and first portion 104A of the cavity is disposed between the second portion of the cavity and first window 114.
  • first outer layer 118 comprises a recess as shown in FIG. 1 , and first portion 104A of cavity 104 is disposed within the recess in the first outer layer.
  • first portion 104A of cavity 104 is disposed outside of the bore in intermediate layer 120.
  • cavity 104 (e.g., second portion 104B of the cavity) is tapered as shown in FIG. 1 such that a cross-sectional area of the cavity decreases along optical axis 112 in a direction from the object side to the image side.
  • second portion 104B of cavity 104 comprises a narrow end 105A and a wide end 105B.
  • the terms“narrow” and“wide” are relative terms, meaning the narrow end is narrower, or has a smaller width or diameter, than the wide end.
  • Such a tapered cavity can help to maintain alignment of interface 110 between first liquid 106 and second liquid 108 along optical axis 112.
  • the cavity is tapered such that the cross-sectional area of the cavity increases along the optical axis in the direction from the object side to the image side or non-tapered such that the cross-sectional area of the cavity remains substantially constant along the optical axis.
  • first outer layer 118 and/or second outer layer 122 comprise a sufficient transparency to enable passage of the image light.
  • first outer layer 118 and/or second outer layer 122 comprise a polymeric, glass, ceramic, or glass-ceramic material.
  • outer surfaces of first outer layer 118 and/or second outer layer 122 are substantially planar.
  • liquid lens 100 can function as a lens (e.g., by refracting image light passing through interface 110), outer surfaces of the liquid lens can be flat as opposed to being curved like the outer surfaces of a fixed lens.
  • outer surfaces of the first outer layer and/or the second outer layer are curved (e.g., concave or convex).
  • the liquid lens comprises an integrated fixed lens.
  • intermediate layer 120 comprises a metallic, polymeric, glass, ceramic, or glass-ceramic material. Because image light can pass through the bore in intermediate layer 120, the intermediate layer may or may not be transparent.
  • lens body 102 of liquid lens 100 is described as comprising first outer layer 118, intermediate layer 120, and second outer layer 122, other embodiments are included in this disclosure.
  • one or more of the layers is omitted.
  • the bore in the intermediate layer can be configured as a blind hole that does not extend entirely through the intermediate layer, and the second outer layer can be omitted.
  • first portion 104A of cavity 104 is described herein as being disposed within the recess in first outer layer 118, other embodiments are included in this disclosure.
  • the recess is omitted, and the first portion of the cavity is disposed within the bore in the intermediate layer.
  • the first portion of the cavity is an upper portion of the bore
  • the second portion of the cavity is a lower portion of the bore.
  • the first portion of the cavity is disposed partially within the bore in the intermediate layer and partially outside the bore.
  • liquid lens 100 comprises a common electrode 124 in electrical communication with first liquid 106. Additionally, or alternatively, liquid lens 100 comprises a driving electrode 126 disposed on a sidewall of cavity 104 and insulated from first liquid 106 and second liquid 108. Different voltages can be supplied to common electrode 124 and driving electrode 126 to change the shape of interface 110 as described herein.
  • liquid lens 100 comprises a conductive layer 128 at least a portion of which is disposed within cavity 104.
  • conductive layer 128 comprises a conductive coating applied to intermediate layer 120 prior to bonding first outer layer 118 and/or second outer layer 122 to the intermediate layer.
  • Conductive layer 128 can comprise a metallic material, a conductive polymer material, another suitable conductive material, or a combination thereof. Additionally, or alternatively, conductive layer 128 can comprise a single layer or a plurality of layers, some or all of which can be conductive.
  • conductive layer 128 defines common electrode 124 and/or driving electrode 126.
  • conductive layer 128 can be applied to substantially the entire outer surface of intermediate layer 118 prior to bonding first outer layer 118 and/or second outer layer 122 to the intermediate layer. Following application of conductive layer 128 to intermediate layer 118, the conductive layer can be segmented into various conductive elements (e.g., common electrode 124, driving electrode 126, and/or other electrical devices).
  • liquid lens 100 comprises a scribe 130A in conductive layer 128 to isolate (e.g., electrically isolate) common electrode 124 and driving electrode 126 from each other.
  • scribe 130A comprises a gap in conductive layer 128.
  • scribe 130A is a gap with a width of about 5 pm, about 10 pm, about 15 pm, about 20 pm, about 25 pm, about 30 pm, about 35 pm, about 40 pm, about 45 pm, about 50 pm, or any ranges defined by the listed values.
  • liquid lens 100 comprises an insulating layer 132 disposed within cavity 104.
  • insulating layer 132 comprises an insulating coating applied to intermediate layer 120 prior to bonding first outer layer 118 and/or second outer layer 122 to the intermediate layer.
  • insulating layer 132 comprises an insulating coating applied to conductive layer 128 and second window 116 after bonding second outer layer 122 to intermediate layer 120 and prior to bonding first outer layer 118 to the intermediate layer.
  • insulating layer 132 covers at least a portion of conductive layer 128 within cavity 104 and second window 116.
  • insulating layer 132 can be sufficiently transparent to enable passage of image light through second window 116 as described herein.
  • Insulating layer 132 can comprise polytetrafluoroethylene (PTFE), parylene, another suitable polymeric or non-polymeric insulating material, or a combination thereof. Additionally, or alternatively, insulating layer 132 comprises a hydrophobic material. Additionally, or alternatively, insulating layer 132 can comprise a single layer or a plurality of layers, some or all of which can be insulating. In some embodiments, insulating layer 132 covers at least a portion of driving electrode 126 (e.g., the portion of the driving electrode disposed within cavity 104) to insulate first liquid 106 and second liquid 108 from the driving electrode. Additionally, or alternatively, at least a portion of common electrode 124 disposed within cavity 104 is uncovered by insulating layer 132.
  • driving electrode 126 e.g., the portion of the driving electrode disposed within cavity 104
  • common electrode 124 can be in electrical communication with first liquid 106 as described herein.
  • insulating layer 132 comprises a hydrophobic surface layer of second portion 104B of cavity 104.
  • Such a hydrophobic surface layer can help to maintain second liquid 108 within second portion 104B of cavity 104 (e.g., by attraction between the non-polar second liquid and the hydrophobic material) and/or enable the perimeter of interface 110 to move along the hydrophobic surface layer (e.g., by electrowetting) to change the shape of the interface as described herein.
  • FIG. 2 is a schematic front view of liquid lens 100 looking through first outer layer 118
  • FIG. 3 is a schematic rear view of the liquid lens looking through second outer layer 122.
  • bonds generally are shown in dashed lines
  • scribes generally are shown in heavier lines
  • other features generally are shown in lighter lines.
  • common electrode 124 is defined between scribe 130A and bond 134A, and a portion of the common electrode is uncovered by insulating layer 132 such that the common electrode can be in electrical communication with first liquid 106 as described herein.
  • bond 134A is configured such that electrical continuity is maintained between the portion of conductive layer 128 inside the bond (e.g., inside cavity 104) and the portion of the conductive layer outside the bond.
  • liquid lens 100 comprises one or more cutouts 136 in first outer layer 118.
  • liquid lens 100 comprises a first cutout 136A, a second cutout 136B, a third cutout 136C, and a fourth cutout 136D.
  • cutouts 136 comprise portions of liquid lens 100 at which first outer layer 118 is removed to expose conductive layer 128.
  • cutouts 136 can enable electrical connection to common electrode 124, and the regions of conductive layer 128 exposed at cutouts 136 can serve as contacts to enable electrical connection of liquid lens 100 to a controller, a driver, or another component of a lens or camera system.
  • cutouts 136 are described herein as being positioned at corners of liquid lens 100, other embodiments are included in this disclosure.
  • one or more of the cutouts are disposed inboard of the outer perimeter of the liquid lens.
  • driving electrode 126 comprises a plurality of driving electrode segments.
  • driving electrode 126 comprises a first driving electrode segment 126A, a second driving electrode segment 126B, a third driving electrode segment 126C, and a fourth driving electrode segment 126D.
  • the driving electrode segments are distributed substantially uniformly about the sidewall of cavity 104.
  • each driving electrode segment occupies about one quarter, or one quadrant, of the sidewall of second portion 104B of cavity 104.
  • adjacent driving electrode segments are isolated from each other by a scribe.
  • first driving electrode segment 126A and second driving electrode segment 126B are isolated from each other by a scribe 130B.
  • second driving electrode segment 126B and third driving electrode segment 126C are isolated from each other by a scribe 130C. Additionally, or alternatively, third driving electrode segment 126C and fourth driving electrode segment 126D are isolated from each other by a scribe 130D.
  • fourth driving electrode segment 126D and first driving electrode segment 126A are isolated from each other by a scribe 130E.
  • the various scribes 130 can be configured as described herein in reference to scribe 130A.
  • the scribes between the various electrode segments extend beyond cavity 104 and onto the back side of liquid lens 100 as shown in FIG. 3. Such a configuration can ensure electrical isolation of the adjacent driving electrode segments from each other. Additionally, or alternatively, such a configuration can enable each driving electrode segment to have a corresponding contact for electrical connection as described herein.
  • driving electrode 126 is described herein as being divided into four driving electrode segments, other embodiments are included in this disclosure. In some other embodiments, the driving electrode is divided into two, three, five, six, seven, eight, or more driving electrode segments.
  • liquid lens 100 comprises one or more cutouts 136 in second outer layer 122.
  • liquid lens 100 comprises a fifth cutout 136E, a sixth cutout 136F, a seventh cutout 136G, and an eighth cutout 136H .
  • cutouts 136 comprise portions of liquid lens 100 at which second outer layer 122 is removed to expose conductive layer 128.
  • cutouts 136 can enable electrical connection to driving electrode 126, and the regions of conductive layer 128 exposed at cutouts 136 can serve as contacts to enable electrical connection of liquid lens 100 to a controller, a driver, or another component of a lens or camera system.
  • Different driving voltages can be supplied to different driving electrode segments to tilt the interface of the liquid lens (e.g., for OIS functionality). Additionally, or alternatively, the same driving voltage can be supplied to each driving electrode segment to maintain the interface of the liquid lens in a substantially spherical orientation about the optical axis (e.g., for autofocus functionality).
  • FIGS. 4 and 5 are perspective and schematic cross-sectional views
  • camera module 200 comprising liquid lens 100.
  • camera module 200 comprises a housing 202.
  • a lens system comprising one or more optical elements can be disposed within housing 202.
  • the lens system comprises a first optical element 204, liquid lens 100, and a second optical element 206.
  • liquid lens 100 is positioned between first optical element 204 and second optical element 206.
  • the first optical element is positioned between the liquid lens and the second optical element
  • the second optical element is positioned between the first optical element and the liquid lens
  • one of the first optical element or the second optical element is omitted.
  • Each of the first optical element and the second optical element can comprise, independently, one or a plurality of lenses (e.g., fixed lenses).
  • each of the first optical element and the second optical element can be a lens stack comprising a plurality of lenses.
  • FIG. 6 is a schematic cross-sectional view of some embodiments of housing 202, without the lens system disposed therein.
  • housing 202 comprises a bore 210 extending substantially parallel to an optical axis 212 of the lens system, and the lens system is disposed within the bore of the housing.
  • bore 210 comprises a substantially cylindrical bore (e.g., with a
  • bore 210 can be configured to receive one or more optical elements (e.g., first optical element 204 and/or second optical element 206) as described herein.
  • liquid lens 100 comprises a width or diameter that is larger than bore 210 of housing 202.
  • cavity 104 can have a width or diameter (e.g., narrow end 105A and/or wide end 105B) that is less than or equal to (or slightly larger than) the width or diameter of bore 210 of housing 202.
  • a portion of the liquid lens can extend outward beyond bore 210 of the housing.
  • housing 202 comprises a void 214 extending
  • void 214 extends at least partially across a width or diameter of housing 202 in a direction substantially
  • void 214 comprises a substantially prismatic void (e.g., with a substantially rectangular longitudinal cross-sectional shape and/or a substantially rectangular transverse cross-sectional shape).
  • void 214 can be
  • FIG. 7 is a perspective view of some embodiments of liquid lens 100 with an electrical coupling 300 connected thereto.
  • electrical coupling 300 comprises a printed circuit board (PCB).
  • PCB printed circuit board
  • FPCB flexible printed circuit board
  • electrical coupling 300 comprises one or more contacts 336 that are electrically coupled to contacts of liquid lens 100 (e.g., through cutouts 136).
  • electrical coupling 300 is positioned on upper and/or lower surfaces of liquid lens 100 as shown in FIG. 7.
  • electrical coupling 300 can comprise a first electrical coupling positioned on the upper surface of liquid lens 100 (e.g., to make electrical connection to common electrode 124) and a second electrical coupling positioned on the lower surface of the liquid lens (e.g., to make electrical connection to driving electrode 126).
  • Each of the first and second electrical couplings can be configured as described herein in reference to electrical coupling 300. Such a configuration can enable liquid lens 100 to support electrical coupling 300.
  • the position of electrical coupling 300 (e.g., on upper and/or lower surfaces of liquid lens 100) can increase the effective thickness of the liquid lens to be received within void 214 of housing 202.
  • void 214 comprises one or more notches 216 as shown in FIG. 6.
  • notches 216 are grooves or channels formed in housing 202 and extending outward from void 214 (e.g., in a direction substantially parallel to bore 210 and/or optical axis 212).
  • notches 216 are portions of void 214 that have an increased height in the optical axis direction compared to a remaining portion of the void.
  • void 214 comprising notches 216 can have a substantially elongated FI-shaped transverse cross-sectional shape as shown in FIGS. 5-6.
  • notches 216 have a size and/or shape corresponding to a portion of electrical coupling 300 disposed on the top and/or bottom surfaces of liquid lens 100.
  • notches 216 comprise a height (or depth), measured from void 214, of about 50 pm, about 60 pm, about 70 pm, about 80 pm, about 90 pm, about 100 pm, or any ranges defined by the listed values.
  • electrical coupling 300 can be received within notches 216 when liquid lens 100 is received within void 214.
  • Such a configuration can enable the nominal height of the void to be reduced (e.g., to substantially the same or slightly larger than the thickness of the liquid lens), which can enable the height of the housing to be reduced while maintaining any appropriate spacing between adjacent lens elements.
  • housing 202 comprises or is formed from a polymer material.
  • housing 202 comprises or is formed from a fiber reinforced polymer material.
  • the fiber reinforced polymer material comprises a fiber reinforcing material comprising carbon, glass, mineral, another fibrous material, or a combination thereof.
  • the fiber reinforcing of the polymer material can reduce the coefficient of thermal expansion (CTE) of the polymer material, thereby reducing the expansion of the housing resulting from increased temperature during operation of the camera module.
  • the fiber reinforcing of the polymer material can increase the yield strength of the polymer material, thereby increasing the mechanical integrity of the housing.
  • some or all of the components of the lens system can be inserted into housing 202 without rotating the components relative to the housing (e.g., without screwing the components into the housing).
  • liquid lens 100 can be slidably inserted or laterally traversed into housing 202 (e.g., into void 114) without rotating the liquid lens.
  • housing 202 e.g., bore 110 and/or void 114) can be free of internal threads configured to threadably engage with the lens system.
  • Such assembly techniques can enable the use of fiber reinforced polymer material.
  • fiber reinforced polymer material such as carbon fiber reinforced polycarbonate
  • a conventional housing in which the lens system is screwed into the housing e.g,, to threadably engaged with internal threads in the housing
  • the lens system can generate significant particulate within the housing (e.g., as the external threads of the lens system rub against the internal threads of the housing), which can impair operation of the camera module (e.g., by depositing particulate on the image sensor and/or inside mechanical actuators that drive the lens system).
  • Flousing 202 described herein can enable assembly of the camera module without rotating the lens system relative to the housing, which can avoid such particulate generation, even when using fiber reinforced polymer material.
  • housing 202 comprises a CTE of 50 ppm/°C or less
  • housing 202 comprises a fiber filled polycarbonate material. In some of such
  • the fiber filled polycarbonate material comprises polycarbonate filled with about 30% carbon fiber, which can have a CTE of about 14 ppm/°C, compared to an unfilled polycarbonate with a CTE of about 65 to 70 ppm/°C.
  • a reduction in expansion of the housing can reduce the change in height of the housing as a function of temperature, which can help to maintain the optical performance of the camera module over an operating temperature range.
  • housing 202 comprises sidewalls 208 disposed adjacent void 214 as shown in FIG. 6.
  • a thickness of sidewalls 208 can be reduced compared to conventional camera module housings.
  • the thickness of sidewalls 208 can be about 0.1 mm, 0.25 mm, 0.5 mm, about 1 mm, about 2 mm, about 3 mm, about 4 mm, about 5 mm or any ranges defined by the listed values. Reducing the thickness of sidewalls 208 can reduce the thermal conductivity of the sidewalls, thereby reducing the expansion of the housing resulting from increased temperature during operation of the camera module. Such a reduction in expansion of the housing can reduce the change in height of the housing as a function of
  • FIG. 8 is a stress map representing the von Mises stress, or equivalent tensile stress, o v , throughout some embodiments of housing 202 upon application of a load to an upper surface of the housing.
  • housing 202 comprises bore 210 extending substantially parallel to optical axis 212, such that the lens system can be disposed within the bore of the housing.
  • housing 202 comprises a first portion 202a, a second portion 202b, and a third portion 202c.
  • First portion 202a of housing 202 can comprise a substantially cylindrical portion (e.g., surrounding bore 210).
  • First portion 202a of housing 202 can be configured to receive a portion of the lens system, (e.g., first optical element 204).
  • Second portion 202b of housing 202 can comprise a substantially prismatic portion (e.g., surrounding void 214). Second portion 202b of housing 202 can be configured to receive a portion of the lens system (e.g., liquid lens 100). Third portion 202c of housing 202 can comprise a substantially prismatic portion (e.g., surrounding bore 210). Third portion 202c of housing 202 can be configured to receive a portion of the lens system (e.g., second optical element 206).
  • bore 210 can extend through housing 202 (e.g., parallel to optical axis 212), and void 214 can extend transverse to the bore as described herein.
  • sidewalls of housing 202 have a thickness of 250 pm.
  • sidewalls 208 adjacent void 214 and sidewalls of first portion 202a adjacent bore 210 have a thickness of 250 pm.
  • Such thin sidewalls can be enabled by use of fiber reinforced polymer materials for housing 202 as described herein, and can enable a combination of mechanical strength and low CTE also as described herein.
  • a simulated load 400 of 45 N was applied to the upper surface of housing 202 (e.g., substantially uniformly along the upper surface), and the von Mises stress throughout the housing was determined.
  • the maximum determined von Mises stress e.g., the maximum root mean square (RMS) stress
  • the maximum RMS stress in housing 202 upon application of a 45 N load to the upper surface of the housing is 120 MPa or less, 110 MPa or less, 100 MPa or less, 97 MPa or less, or any ranges defined by the listed values.
  • the von Mises stress can be used to predict yielding of materials under stress. For example, a material can be said to yield when the von Mises stress reaches the yield strength, o y , of the material.
  • the simulated load on the upper surface of housing 202 was gradually increased to determine the yield strength of the housing.
  • the determined yield strength of housing 202 formed from 30% carbon fiber filled polycarbonate material was 120 MPa, compared to the determined yield strength of a comparative housing formed from unfilled polycarbonate material, which was 67 MPa.
  • the yield strength of housing 202 formed from the filled polycarbonate material was greater than the maximum RMS stress generated upon application of load 400, while the yield strength of the comparative housing formed from the unfilled
  • the filled polycarbonate material can enable housing 202 to withstand the stress generated by applying load 400.
  • the yield strength of housing 202 is greater than the maximum RMS stress in the housing upon application of a test load to the upper surface of the housing.
  • the yield strength of housing 202 is at least 5%, at least 10%, at least 15%, at least 20%, or at least 23% greater than the maximum RMS stress in the housing upon application of the test load to the upper surface of the housing, or any ranges defined by the listed values.
  • the test load is 45 N, 50 N, 55 N, 60 N, 65 N, 70 N,
  • reduced thickness of sidewalls 208 of housing 202 can include openings formed in the sidewalls, which can be enabled at least in part by the fiber reinforced polymer material of the housing described herein.
  • openings e.g., in second portion 202b of housing 202

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)
  • Lens Barrels (AREA)

Abstract

Un module de caméra comprend un boîtier comprenant un vide s'étendant dans une direction transversale qui est transversale à un axe optique. Une lentille liquide est disposée à l'intérieur du vide. Un couplage électrique est disposé sur une surface de la lentille liquide et reçu dans une encoche du boîtier.
PCT/US2019/019943 2018-03-01 2019-02-28 Modules de caméra comprenant des lentilles liquides WO2019169069A2 (fr)

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US201862637342P 2018-03-01 2018-03-01
US62/637,342 2018-03-01

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WO2019169069A2 true WO2019169069A2 (fr) 2019-09-06
WO2019169069A3 WO2019169069A3 (fr) 2019-10-10

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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59229505A (ja) * 1983-06-13 1984-12-24 Hitachi Ltd ビデオカメラ用鏡筒
US5593752A (en) * 1995-11-28 1997-01-14 Eastman Kodak Company Low CTE/CME boron/carbon fiber laminates and method of making them
EP2009468B1 (fr) * 2007-06-29 2011-10-19 Varioptic Dispositif d'électromouillage à électrode de polymère
US8649102B2 (en) * 2008-12-23 2014-02-11 Parrot S.A. Optical electrowetting device

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* Cited by examiner, † Cited by third party
Title
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TW201944119A (zh) 2019-11-16

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