WO2015005055A1 - Dispositif d'imagerie - Google Patents

Dispositif d'imagerie Download PDF

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Publication number
WO2015005055A1
WO2015005055A1 PCT/JP2014/065577 JP2014065577W WO2015005055A1 WO 2015005055 A1 WO2015005055 A1 WO 2015005055A1 JP 2014065577 W JP2014065577 W JP 2014065577W WO 2015005055 A1 WO2015005055 A1 WO 2015005055A1
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WO
WIPO (PCT)
Prior art keywords
lens
array lens
sma
actuator
imaging apparatus
Prior art date
Application number
PCT/JP2014/065577
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English (en)
Japanese (ja)
Inventor
篤広 野田
Original Assignee
コニカミノルタ株式会社
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 コニカミノルタ株式会社 filed Critical コニカミノルタ株式会社
Publication of WO2015005055A1 publication Critical patent/WO2015005055A1/fr

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    • 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
    • G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
    • 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
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/0056—Arrays characterized by the distribution or form of lenses arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
    • G03B3/10—Power-operated focusing
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
    • 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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
    • G03B2205/0007—Movement of one or more optical elements for control of motion blur
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
    • G03B2205/0053—Driving means for the movement of one or more optical element

Definitions

  • the present invention relates to an imaging apparatus using a multi-array lens.
  • image pickup devices for example, mobile phones with cameras
  • image quality in recent years, image pickup devices (for example, mobile phones with cameras) have dramatically improved image quality, and in addition to improving the basic function of image shooting such as increasing the number of pixels of the image pickup element, the focus function, Various functions such as a zoom function and a camera shake correction function are required to be added.
  • An actuator that drives the lens in the optical axis direction is required to add the focus function and zoom function, and a direction opposite to the camera shake direction (for example, the direction orthogonal to the optical axis) is required to add the camera shake correction function.
  • an actuator for driving the lens is required.
  • a lens is used by utilizing a shape change caused by energizing and heating a shape memory alloy (hereinafter referred to as SMA).
  • SMA shape memory alloy
  • this type of imaging apparatus is also required to be downsized.
  • mounting the above-described various actuators has been a factor in increasing the size of the apparatus.
  • the present invention has been made in view of the above circumstances, and provides an imaging device capable of suppressing an increase in size of the device while maintaining imaging accuracy by improving a lens driving mechanism (actuator). With the goal.
  • an imaging device includes a fixed unit, and a lens unit including a multi-array lens in which a plurality of unit lenses are arranged in parallel at intervals.
  • a movable holding unit that is spanned between at least a part of the lens unit and the fixed unit located on a side of the lens unit, and movably holds the at least part of the lens unit.
  • An actuator that acts directly or indirectly on the at least part of the lens part, and that drives the action part from the fixed part side to displace the at least part of the lens part,
  • An imaging element that receives measurement light obtained through the lens unit, and at least a part of the action unit spatially transmits a plurality of unit imaging light fluxes that respectively pass through the plurality of unit lenses. Characterized in that it is arranged in row spacing.
  • At least a part of the action unit that displaces at least a part of the lens unit is a spatial unit of a plurality of unit imaging light fluxes that respectively pass through the plurality of unit lenses of the multi-array lens. Arranged within the arrangement interval (effective inter-optical region).
  • FIG. 2 is a side view of the imaging apparatus 1 according to the first embodiment as viewed from the AA cross section of FIG.
  • FIG. 2 is a side view of the imaging apparatus 1 according to the first embodiment as viewed from a BB cross section in FIG. 1.
  • FIG. 2 is a side view of the imaging apparatus 1 according to the first embodiment when viewed from a CC section of FIG. 1.
  • the imaging device 1 which concerns on 1st Embodiment it is the elements on larger scale of strip
  • the imaging device 1 which concerns on 1st Embodiment it is the XZ side view of the state which driven the actuator 5.
  • FIG. 1 is the elements on larger scale of strip
  • FIG. 11 is an XZ side view of an imaging apparatus 1C according to a modification of the first embodiment, as viewed from a DD section in FIG.
  • FIG. 11 is an XZ side view of an imaging apparatus 1C according to a modification of the first embodiment, as viewed from a DD section in FIG.
  • FIG. 14 is an XZ side view of an imaging apparatus 1D according to a modification of the first embodiment, as viewed from a section EE in FIG.
  • FIG. 14 is an XZ side view of an imaging apparatus 1D according to a modification of the first embodiment, as viewed from a section EE in FIG. It is the elements on larger scale of strip
  • FIG. 18 is a side view of an imaging apparatus 1E according to the second embodiment as viewed from the FF cross section of FIG. FIG.
  • FIG. 18 is a side view of an imaging apparatus 1E according to the second embodiment as viewed from a GG section in FIG.
  • FIG. 18 is a side view of an imaging apparatus 1E according to the second embodiment as viewed from a GG section in FIG. It is the YZ side view which added the effective optical area
  • It is a top view of imaging device 1F concerning the modification of a 2nd embodiment.
  • It is a top view of imaging device 1G concerning the modification of a 2nd embodiment.
  • FIG. 25 is an XZ side view of an imaging apparatus 1H according to a modification of the second embodiment, as viewed from the HH section of FIG.
  • FIG. 25 is an XZ side view of an imaging apparatus 1H according to a modification of the second embodiment, as viewed from the HH section of FIG.
  • FIG. 25 is a YZ side view of an imaging apparatus 1H according to a modification of the second embodiment, as viewed from the II cross section of FIG. It is a top view of imaging device 1I concerning the modification of a 2nd embodiment.
  • FIG. 29 is an XZ side view of an imaging apparatus 1I according to a modification of the second embodiment as seen from the JJ cross section of FIG. FIG.
  • FIG. 29 is an XZ side view of an imaging apparatus 1I according to a modification of the second embodiment as seen from the JJ cross section of FIG. It is a top view of imaging device 1J concerning a 3rd embodiment.
  • FIG. 32 is an XZ side view of the imaging apparatus 1J according to the third embodiment as seen from the KK cross section of FIG. 31.
  • FIG. 32 is an XZ side view of the imaging apparatus 1J according to the third embodiment as seen from the KK cross section of FIG. 31.
  • imaging device 1J concerning a 3rd embodiment it is XZ side view which added effective optical field L2.
  • FIG. 36 is an XZ side view of the imaging apparatus 1K according to the fourth embodiment, as viewed from the LL cross section of FIG.
  • FIG. 36 is an XZ side view of the imaging apparatus 1K according to the fourth embodiment, as viewed from the LL cross section of FIG. It is a top view of imaging device 1L concerning the modification of a 4th embodiment.
  • FIG. 39 is an XZ side view of an imaging apparatus 1L according to a modification of the fourth embodiment, as viewed from the MM cross section of FIG.
  • FIG. 39 is an XZ side view of an imaging apparatus 1L according to a modification of the fourth embodiment, as viewed from the MM cross section of FIG.
  • It is a XZ side view of imaging device 1M concerning a 5th embodiment.
  • It is a YZ side view of imaging device 1M concerning a 5th embodiment.
  • the multi-array lens is provided as the optical element constituting the lens unit LP, and the lens unit LP displaced by the actuator is the multi-array lens AL (the lens unit LU in the imaging device 1H).
  • AL the lens unit LU in the imaging device 1H.
  • an imaging device having a multi-array lens and a single lens as optical elements constituting the lens portion LP, and the optical element displaced by the actuator is a single lens as a part of the lens portion LP.
  • the device 1M will be described.
  • the image pickup apparatus of these embodiments can have various sizes depending on its specific use, but is particularly useful as a small image pickup apparatus incorporated in a mobile phone or a tablet terminal.
  • FIG. 1 is a top view schematically showing main components of an imaging apparatus 1 according to the present invention.
  • 2 to 4 are side views as seen from the AA, BB, and CC sections of FIG. 1, respectively.
  • the right-handed XYZ coordinates are attached as necessary for the purpose of clarifying the arrangement relationship of each part.
  • the upper direction means the + Z direction and the lower direction means the -Z direction.
  • the imaging apparatus 1 mainly includes a base 2, a side wall 3, a multi-array lens AL, and a movable holding unit 4 that is spanned over the side wall 3 and the multi-array lens AL and holds the multi-array lens AL at a reference position. And an actuator 5 that drives the multi-array lens AL in the optical axis direction (Z direction in the figure) and an image sensor 6 that receives light obtained through the multi-array lens AL. Each part is assembled.
  • the base 2 is fixed to a member (for example, a mobile phone housing or a mount substrate) to which the imaging device 1 is attached, and is a stationary member that constitutes the lower surface of the imaging device 1.
  • the base 2 is formed in a square plate shape in the XY plan view, and is entirely made of a resin material or the like.
  • the side wall 3 is an immovable member formed perpendicular to the base 2 and is constituted by four plate-like members corresponding to the square sides of the base 2. For this reason, the base 2 and the side wall 3 are box-shaped frame bodies that enclose a hollow space L1 that is optically opened to the external space by a predetermined window WD (a region on the + Z side without the base 2 and the side wall 3).
  • the multi-array lens AL (particularly, a portion related to the inter-lens region S1 described later) is made of glass or heat resistant resin.
  • the belt-like SMA 50 FIG. 6
  • the belt-like SMA 50 has a thin plate shape, and its plate surface is parallel to the unit lens array surface (XY plane) of the multi-array lens AL.
  • the movable holding portion 4 is bridged between the side wall 3 and the multi-array lens AL, and holds the multi-array lens AL movably along the Z direction at the reference position (position shown in FIGS. 1 to 4). And has a function as a rectilinear guide part that restricts the driving direction of the multi-array lens AL in the Z direction and a function as a holding part that holds the multi-array lens AL.
  • the movable holding unit 4 is configured using four parallel leaf springs.
  • the reference position is a position where the multi-array lens AL is arranged in a state where the actuator 5 is not activated.
  • the multi-array lens AL is held in parallel with the XY plane in a state in which the distance between the four sides of the outer edge of the multi-array lens AL and the four sides of the inner edge of the side wall 3 is kept constant in the XY plan view. The position becomes the reference position.
  • the two upper leaf springs 41 have the same height (Z position), one end attached to the side wall 3 and the other end attached to the upper surface (+ Z side) of the multi-array lens AL.
  • the arrangement of the two upper leaf springs 41 is determined to be point-symmetric in the XY plan view when viewed from the center point of the multi-array lens AL in the XY plan view (hereinafter referred to as “center point PO”).
  • the arrangement relationship of the two lower leaf springs 42 is the same, and the two lower leaf springs 42 have the same height position (Z position), one end of which is attached to the side wall 3 and the other end of the lower surface of the multi-array lens AL ( -Z side).
  • Z position height position
  • two upper leaf springs 41 and two lower leaf springs 42 are drawn to overlap each other, and only two upper leaf springs 41 located on the near side (+ Z side) in the top view are drawn. .
  • the movable holding portion 4 is a multi-piece. With the array lens AL held at the reference position, two upper leaf springs 41 and so that a slight spring force in the ⁇ Z direction acts on the multi-array lens AL (the multi-array lens AL is biased to the belt-shaped SMA 50). Two lower leaf springs 42 are designed.
  • the two upper leaf springs 41 (the same applies to the two lower leaf springs 42) meander from the attachment position on the side wall 3 to the attachment position on the multi-array lens AL. .
  • the purpose of this is to reduce the spring constant by increasing the length of each leaf spring. The reason for reducing the spring constant will be described later.
  • plate springs 42 of this embodiment are only examples of the arrangement
  • various structures are comprised. It can be used as a movable holding part.
  • FIG. 5 is a partially enlarged view illustrating an enlarged range surrounded by a dotted line in FIG.
  • the actuator 5 includes a belt-like SMA 50 (action portion) provided between the frame body FL and the multi-array lens AL, a conductive wire 51 arranged in a parallel reciprocating path along the surface of the belt-like SMA 50, a power supply portion (not shown)
  • the SMA actuator is configured to apply a driving force to the multi-array lens AL by deforming the belt-like SMA 50 by energizing and heating the conductive wire 51 by the power supply unit.
  • the conducting wire 51 has a function as a linear heater that generates heat when it is energized. Further, the surface of the conducting wire 51 is covered with a thin electrical insulating layer so that when the conducting wire 51 is energized, the current does not leak into the strip SMA 50. Joule heat generated in the conducting wire 51 when the conducting wire 51 is energized is transmitted to the belt-like SMA 50 through the electrical insulating layer.
  • the band-shaped SMA 50 is a long plate-shaped member made of a shape memory alloy such as a Ni—Ti alloy, for example, and one end 50a in the longitudinal direction is fixed to the side wall 3, and the other end 50b is a multi-array lens.
  • the unit lenses LE are in contact with each other (see FIGS. 1 and 5).
  • an inter-lens area S1 a partial area within the arrangement interval of the plurality of unit lenses LE in the area on the surface of the multi-array lens AL.
  • the deformation of the belt-shaped SMA 50 is performed. Is preferable because an upward driving force (+ Z direction) can be applied to the multi-array lens AL more favorably.
  • the actuator 5 when the actuator 5 is not driven, a slight spring force acts on the multi-array lens AL in the ⁇ Z direction by holding the movable holding portion 4 (four parallel leaf springs), and the multi-array lens AL is biased to the end portion 50b of the strip SMA 50. For this reason, the strip-like SMA 50 is deformed in the ⁇ Z direction according to the spring force in a state where the elastic modulus is low (martensite phase) at a low temperature.
  • the belt-like SMA 50 shown in FIGS. 1 to 4 is a belt-like SMA in a state where this deformation has occurred.
  • the multi-array lens AL is held at the reference position by the belt-like SMA 50 after being deformed and the movable holding portion 4.
  • the multi-array lens AL is actuated (driven) in the + Z direction with the end 50b as an action point as the shape of the belt-like SMA 50 is recovered.
  • FIG. 6 is a side view of the imaging apparatus 1 showing the multi-array lens AL in a state driven in the + Z direction in accordance with the shape recovery of the belt-like SMA 50.
  • the amount of displacement of the multi-array lens AL in the + Z direction is adjusted by controlling the current supplied to the conducting wire 51 of the actuator 5 or controlling the applied voltage.
  • the power supply unit is provided with a control circuit (not shown) that controls the amount of current applied to the conducting wire 51 or the applied voltage in accordance with the required drive amount of the multi-array lens AL.
  • the strip SMA 50 functions as an action part that directly acts on the multi-array lens AL.
  • the actuator 5 functions as a drive unit that drives the band-like SMA 50 serving as the action unit from the side wall 3 side to reversibly displace the multi-array lens AL from the reference position.
  • the restoring force by the movable holding portion 4 becomes larger as the displacement amount from the reference position with respect to the multi-array lens AL becomes larger. Therefore, as the displacement amount increases.
  • the required driving force (required current or required voltage) by the actuator 5 also increases. In general, from the viewpoint of securing the Z-direction driving range of the multi-array lens AL by the actuator 5, it is desirable that this required driving force is small.
  • the actuator 5 since the spring constant is lowered by meandering the movable holding portion 4 (the upper leaf spring 41 and the lower leaf spring 42) as described above, the actuator 5 accompanying the increase in the displacement amount. Although there is an increase in the required driving force due to the above, the required driving force can be suppressed as a whole.
  • the belt-like SMA 50 is cooled and returns to the martensite phase, and the driving force in the + Z direction disappears.
  • the multi-array lens AL returns to the reference position due to the balance between the spring force in the ⁇ Z direction by the movable holding portion 4 that holds the multi-array lens AL and the acting force in the + Z direction in the strip SMA 50 in the martensite phase. .
  • the multi-array lens AL can be reversibly displaced from the reference position along the optical axis direction (Z direction) according to the current applied to the conducting wire 51 or the applied voltage. Then, zoom adjustment and focus adjustment in the imaging apparatus 1 are realized by the displacement of the multi-array lens AL in the optical axis direction.
  • the electrically insulated conductor 51 is reciprocated along the strip SMA 50, and the conductor 51 is energized and heated.
  • the strip SMA itself may have a reciprocating shape, and the strip SMA may be energized to reversibly deform the strip SMA with Joule heat generated from the strip SMA itself.
  • the same effect as that of making the movable holding portion 4 meander can be generally achieved by making the movable holding portion 4 non-linear (curved or bent).
  • the imaging device 6 is coupled to the base 2 (a part of the frame body FL) on the opposite side ( ⁇ Z side) to the window WD provided on the + Z side with respect to the multi-array lens AL, and is incident from the window WD to enter the multi-array.
  • Measurement light (a plurality of unit imaging light beams IR described later with reference to FIG. 7) obtained through the plurality of unit lenses LE of the lens AL is received.
  • the measurement light is photoelectrically converted and sent as image data to a predetermined data processing device (not shown).
  • FIG. 7 is a diagram in which a plurality of unit imaging light beams IR are added to FIG. 4 (side view seen from the CC section in FIG. 1).
  • the unit imaging light beam IR means a light beam that passes through the unit lenses LE constituting the multi-array lens AL.
  • the hollow space L1 of the frame body FL (the base 2 and the side wall 3) is (A) an “effective optical region L2” that is a spatial region through which at least one of the plurality of unit imaging light beams IR passes; (B) an “effective inter-optical region L3” that is a spatial region corresponding to a spatial arrangement interval of the plurality of unit imaging light beams IR; (C) "effective optical outside region L4" that does not belong to either the effective optical region L2 or the effective inter-optical region L3 in the hollow space L1, A description will be made by virtually dividing into three spatial regions.
  • the effective optical region L2 is a passage region of the measurement light from when the measurement light is incident through the window WD of the imaging device 1 until it is received by the image sensor 6. Therefore, from the viewpoint of maintaining imaging accuracy (decreasing noise in imaging), the effective optical region L2 optically affects the measurement light for purposes other than the optical design of the apparatus (blocking, attenuation, and measurement light). It is desirable not to arrange a member that reflects or refracts.
  • the belt-like SMA 50 which is the action part of the actuator 5 is designed to be long to a certain extent in the longitudinal direction from the viewpoint of securing the deformation amount (driving amount as the actuator 5) and improving the focus function and the zoom function. Is desired. This is because the deformation amount of the strip SMA 50 depends on the length in the longitudinal direction.
  • a plurality of units each passing through a plurality of unit lenses LE through a part of the belt-like SMA 50 (the action portion of the actuator 5). They are arranged in the effective inter-optical region L3, which is the spatial arrangement interval of the imaging light beam IR.
  • one end portion 50b of the band-shaped SMA 50 is coupled to the multi-array lens AL in an inter-lens area S1 that is an area within the arrangement interval of the plurality of unit lenses LE on the surface of the multi-array lens AL.
  • Coupled is sufficient if the morphological integral relationship between the one-side end portion 50b of the belt-like SMA 50 and the multi-array lens AL is formed within the driving range of the actuator 5. Therefore, the concept of “coupling” includes not only the case where a morphological integral relationship between both members is formed regardless of the driving range of the actuator 5 such as a configuration in which both members are fixed, but also the imaging device 1 of the present embodiment. As described above, the case where the multi-array lens AL is urged by the belt-like SMA 50 to form a substantially morphological integral relationship only within the driving range is also included.
  • strip SMA 50 only the end portion 50b is coupled to the inter-lens region S1, and other portions of the strip SMA 50 may be separated from the inter-lens region S1 in the driving process of the actuator 5 (FIG. 3, FIG. 6).
  • the strip SMA 50 is designed not to be disposed in the effective optical region L2 of the multi-array lens AL (the entire strip SMA 50 is continuously disposed in the effective inter-optical region L3 or the effective optical outside region L4). desirable.
  • the action portion of the actuator 5 is internally connected to the multi-array lens AL.
  • the multi-array lens AL which is an assembly of fine microlenses, does not need to be processed for coupling, etc. Desirable from.
  • the imaging devices 1A to 1D according to the following modifications, as in the imaging device 1 of the first embodiment, by arranging a part of the belt-like SMA 50 in the effective inter-optical region L3, it is possible to maintain imaging accuracy. Suppression of device enlargement and securing of the deformation amount (drive amount) can be achieved at the same time.
  • symbol is attached
  • FIG. 8 is a top view showing an imaging apparatus 1A in which two strip-shaped SMAs 50 are spanned from the opposite side walls 3 to the ⁇ Z side of the multi-array lens AL.
  • FIG. 9 is a top view showing the imaging apparatus 1B in which two strip-shaped SMAs 50 are respectively stretched from the side wall 3 on the same side to the ⁇ Z side of the multi-array lens AL.
  • one end 50a of one strip SMA 50 is fixed to the side wall 3, and the other end 50b is coupled to the ⁇ Z side center point PO of the multi-array lens AL.
  • an imaging device that bridges two belt-like SMAs 50 between the multi-array lens AL and the side wall 3 may be used.
  • the end portions 50b (action points) of the two strip-shaped SMAs 50 (action portions) coupled to the multi-array lens AL are point-symmetric with respect to the center point PO. It is desirable to be arranged. This is because, by exhibiting the same deformation amount (driving force) for the two strip-shaped SMAs 50, the resultant force can be favorably applied to the center point PO (center of gravity) of the multi-array lens AL in the XY plan view. The same applies to the case where the imaging apparatus includes three or more strip-shaped SMAs 50 (action units).
  • FIG. 10 is a top view showing the imaging apparatus 1C in which the belt-like SMA 50 is bridged between the side wall 3 and the position corresponding to the center point PO on the + Z side of the multi-array lens AL.
  • FIG. 11 is a side view of the imaging device 1C as seen from the DD cross section of FIG. 10 when the strip SMA 50 is in the martensite phase.
  • FIG. 12 is a side view of the imaging device 1C as seen from the DD cross section of FIG. 10 when the strip SMA 50 is in the austenite phase.
  • one end 50a of the strip SMA 50 is fixed to the side wall 3, and the other end 50b is coupled to the center point PO on the lower surface ( ⁇ Z side) of the multi-array lens AL.
  • the imaging apparatus 1C FIGGS. 10 to 12
  • an imaging apparatus in which the end portion 50b of the strip SMA 50 is coupled to the upper surface (+ Z side) of the multi-array lens AL may be used.
  • the imaging device 1C has a lower surface coupled (for example, fixed) to the inter-lens region S1 on the upper surface of the multi-array lens AL, and the upper surface is an end of the band-shaped SMA 50
  • the coupling member 7 is coupled to the part 50b (for example, fixed).
  • a slight spring force acts on the multi-array lens AL in the ⁇ Z direction by holding the movable holding portion 4 (four parallel leaf springs), and the coupling is performed.
  • the above-described spring force in the ⁇ Z direction also acts on the belt-like SMA 50 coupled to the multi-array lens AL via the member 7.
  • the strip-like SMA 50 is deformed in the ⁇ Z direction according to the spring force in a state where the elastic modulus is low at low temperatures (martensite phase).
  • the multi-array lens AL is held at the reference position by the deformed belt-like SMA 50 and the movable holding portion 4 (FIG. 11).
  • a voltage is applied to the 1st electrode 51a and the 2nd electrode 51b of the conducting wire 51 by a power supply part, and the conducting wire 51 is energized, A Joule heat generate
  • the multi-array lens AL is acted in the + Z direction from the end 50b via the coupling member 7 as the shape of the belt-like SMA 50 is restored (FIG. 12).
  • the actuator has a belt-like SMA 50 (action portion) and is configured to reversibly displace the multi-array lens AL (lens portion LP) from the reference position by driving the action portion from the frame body FL side.
  • the positional relationship of the belt-like SMA 50 (action unit) with respect to the multi-array lens AL may be on the window WD side or on the image sensor 6 side along the optical axis (Z axis).
  • FIG. 13 is a top view showing an imaging apparatus 1D that uses a link mechanism 43 as the movable holding portion 4D instead of the two upper leaf springs 41 and the two lower leaf springs 42 of the first embodiment.
  • FIG. 14 is a side view of the imaging apparatus 1D viewed from the EE cross section of FIG. 13 when the belt-like SMA 50 is in the martensite phase.
  • FIG. 15 is a side view of the imaging apparatus 1D viewed from the EE cross section of FIG. 13 when the strip SMA 50 is in the austenite phase.
  • the movable holding portion 4D (link mechanism 43) mainly includes a fixing member 431 fixed to the side wall 3 on the ⁇ X side, and a plurality of link members 432 (between the fixing member 431 and the multi-array lens AL).
  • the multi-array lens AL is movably held at a predetermined reference position.
  • the movable holding portion 4D like the movable holding portion 4, has a function as a linear guide portion that restricts the driving direction of the multi-array lens AL in the Z direction and a function as a holding portion that holds the multi-array lens AL.
  • the four link members 432 may be configured by members having the same shape (stiff L-shaped member in the present modification) having rigidity and suppressing occurrence of bending, and the cross-sectional shape thereof is flat, circular, There is no particular limitation such as an ellipse.
  • Two link members 432 are arranged at positions sandwiching the multi-array lens AL from the ⁇ Y direction.
  • the two link members 432 arranged on the + Y direction side of the multi-array lens AL are arranged in parallel at different positions along the optical axis direction (Z direction).
  • the two link members 432 arranged are also arranged in parallel at different height positions along the optical axis direction (Z direction).
  • the link members 432 located on the upper side and the link members 432 located on the lower side are arranged at the same height position (Z direction position). .
  • FIGS. 14 and 15 show only two link members 432 located on the near side ( ⁇ Y side).
  • the connecting member 433 is a member for rotatably connecting each link member 432 to the multi-array lens AL and the fixing member 431.
  • an elastic hinge, a coil spring, or the like is used.
  • Each link member 432 is connected by two connecting members 433 so that the fixed member 431 side is a fixed end and the multi-array lens AL side is a free end. Further, the connecting position is symmetric on the ⁇ Y side of the multi-array lens AL. With this configuration, the link mechanism 43 can hold the multi-array lens AL so that it can be driven well along the optical axis.
  • the link member 432 is disposed such that the stopper 432a is brought into contact with the side wall 3 in a state where the four link members 432 are bridged at right angles to the optical axis (Z axis). For this reason, when the actuator 5 is not driven and the belt-like SMA 50 is in the martensite phase, the load of the multi-array lens AL is held on the side wall 3 via the 4-link mechanism 43 (movable holding portion 4). (FIG. 14). Further, as a mode different from the present modification, the movable holding unit 4D may be provided with a holding mechanism (such as an elastic member) for holding the multi-array lens AL separately from the link mechanism 43.
  • a holding mechanism such as an elastic member
  • a voltage is applied to the 1st electrode 51a and the 2nd electrode 51b of the conducting wire 51 by a power supply part, and the conducting wire 51 is energized, A Joule heat generate
  • the deformed belt-like SMA 50 is heated by the Joule heat, transforms into an austenite phase, and returns to its original shape (recovers its shape) from the deformed state against the weight of the multi-array lens AL in the -Z direction.
  • the multi-array lens AL is acted in the + Z direction from the end 50b via the coupling member 7 as the shape of the belt-like SMA 50 is restored (FIG. 12).
  • the imaging device 1D of this modification uses the parallel link mechanism 43 as the movable holding portion 4D, the multi-array lens AL can be driven better along the optical axis.
  • the movable holding portion 4D also includes the link mechanism 43 (this modification) and the line in addition to the configuration including the upper leaf spring 41 and the lower leaf spring 42 used in the imaging device 1 of the first embodiment.
  • Various holding mechanisms that guide the displacement direction of the multi-array lens AL in a predetermined direction such as a configuration using a shape spring, can be employed.
  • the imaging devices 1A to 1D have been described as modifications of the imaging device 1.
  • an imaging device having the same effect can be obtained even when a bimetallic strip member is used instead of the strip SMA 50.
  • an electrically insulated heater wire is attached to the bimetal, and the amount of bending of the bimetal is changed by controlling the amount of electricity applied to the heater wire, thereby at least the lens portion LP. A part can be displaced reversibly.
  • the conductor 51 is routed along the strip SMA 50 from the vicinity of one end 50a to the vicinity of the other end 50b and again to the vicinity of the one end 50a.
  • the reciprocating wiring type energization method has been described (FIG. 5), the present invention is not limited to this.
  • both end portions 50a of a strip-shaped SMA 50 formed in a substantially U-shape are fixed to the side wall 3, and the U-shaped folded portion 50c of the strip-shaped SMA 50 is connected to the center point PO of the multi-array lens AL.
  • a conductive wire 51 may be provided in the vicinity of both end portions 50a so that the belt-like SMA 50 can be energized.
  • various energization modes capable of energizing substantially the entire strip SMA 50 spanned between the side wall 3 and the multi-array lens AL can be employed.
  • FIG. 17 is a top view schematically showing main components of the imaging apparatus 1E according to the second embodiment.
  • 18 is a side view of the image pickup apparatus 1E viewed from the FF section of FIG. 17, and
  • FIGS. 19 and 20 are side views of the image pickup apparatus 1E viewed from the GG section of FIG.
  • the imaging device 1E according to the second embodiment is different from the imaging devices 1 and 1A to 1D described above in that a linear SMA 53 (so-called “smart”) is used as an action part of the actuator 5E. , SMA wire).
  • the remaining configuration of the imaging device 1E is the same as that of the imaging device 1 of the first embodiment.
  • the actuator 5E includes a linear SMA 53 (operation part) provided between the frame body FL and the multi-array lens AL, a conducting wire 51 for energizing the linear SMA 53, and a power supply unit (not shown).
  • This is a so-called SMA actuator that applies a driving force to the multi-array lens AL by deforming (contracting) the linear SMA 53 by energizing and heating the conductive wire 51 by the portion.
  • the linear SMA 53 is a linear member made of a shape memory alloy such as a Ni—Ti alloy, for example, and both ends 53a and 53b are fixed at the same YZ position on the opposite side wall 3 ( ⁇ X side wall 3). .
  • a constant section 53c on the center side (hereinafter referred to as “action section 53c”) of the entire length of the linear SMA 53 is applied to the inter-lens area S1 on the lower surface side ( ⁇ Z side) of the multi-array lens AL in a tensioned state. Touched.
  • FIGS. 17 to 19 show the linear SMA in a state where the deformation (extension) has occurred, and the multi-array lens AL is held at the reference position by the linear SMA 53 and the movable holding portion 4 after the deformation.
  • the conducting wire 51 having the first electrode 51a is connected in the vicinity of the + X side end portion 53a of the linear SMA 53, and the conducting wire 51 having the second electrode 51b is connected to the ⁇ X side end portion of the linear SMA 53. It is connected near 53b.
  • FIG. 20 is a side view showing the imaging apparatus 1E after driving in the + Z direction.
  • the action section 53c of the strip SMA 50 passes through the center point PO (center of gravity) of the multi-array lens AL, and the entire linear SMA 53 is symmetrically arranged (point symmetry) when viewed from the center point PO. This is preferable because the actuator 5E can drive the multi-array lens AL with good driving force (+ Z direction).
  • the linear SMA 53 functions as an action part that directly acts on the multi-array lens AL.
  • the actuator 5E functions as a drive unit that drives the linear SMA 53, which is an action unit, from the side of the side wall 3 serving as a fixed end thereof and reversibly displaces the multi-array lens AL from the reference position.
  • the linear SMA 53 is cooled and returns to the martensite phase, and the driving force in the + Z direction disappears.
  • the multi-array lens AL is brought to the reference position by the balance between the spring force in the -Z direction by the movable holding portion 4 holding the multi-array lens AL and the acting force in the + Z direction in the linear SMA 53 of the martensite phase.
  • FIG. 21 is a diagram in which a plurality of unit imaging light beams IR are added to FIG. 18 (side view seen from the section FF in FIG. 17). Below, the characteristic of arrangement
  • the effective optical region L2 is provided with a member that influences the progress of the measurement light (blocks, attenuates, refracts the measurement light, etc.) from the viewpoint of maintaining the imaging accuracy (reducing noise in the imaging). It is desirable not to. Further, from the viewpoint of suppressing the enlargement of the imaging device 1, it is desired to reduce the space arranged in the effective optical outside region L4 for each member constituting the imaging device 1.
  • the linear SMA 53 that is the action portion of the actuator 5E is, like the belt-like SMA 50 that is the action portion of the actuator 5, from the viewpoint of securing the deformation amount (driving amount as the actuator 5E) and improving the focus function and the zoom function. It is desired to be designed for a certain length.
  • the action section 53c which is a part of the linear SMA 53, is arranged in the effective inter-optical region L3
  • the linear SMA 53 is used as the effective optical region.
  • L2 it is possible to reduce the space arranged in the effective optical outside region L4 and to design it to a certain extent.
  • the imaging device 1 of the first embodiment it is possible to simultaneously maintain the imaging accuracy, suppress the enlargement of the device, and ensure the deformation amount (drive amount).
  • the multi-array lens AL which is an assembly of fine micro lenses, is used. This is desirable from the viewpoint of reducing the manufacturing cost.
  • the action section 53c of the linear SMA 53 is formed on the surface of the multi-array lens AL over the entire section at any point in the deformation process due to the phase transformation by urging the multi-array lens AL in the -Z direction by the movable holder 4. It is combined with the inter-lens region S1 (a part of the effective inter-optical region L3).
  • the portion of the linear SMA 53 other than the action interval 53c (the central interval), that is, the outer interval 53d of the linear SMA 53 is arranged in the effective optical outer region L4 at any point in the deformation process. Therefore, in the imaging device 1E of the second embodiment, a part of the linear SMA 53 is not arranged in the effective optical region L2 at any point in the deformation process due to the phase transformation.
  • the action part is not arranged in the effective optical region L2 at any point in the deformation process of the action part (band-shaped SMA 50), which is a design consideration of the image pickup apparatus 1 (the action part It is not necessary to note that it is desirable that the design is made so that the entirety is continuously arranged in the effective inter-optical region L3 or the effective optical outside region L4).
  • Imaging Device 1E of Second Embodiment ⁇ 2.3 Modification of Imaging Device 1E of Second Embodiment>
  • the imaging apparatus 1E according to the second embodiment using the linear SMA 53 as the action part of the actuator 5E has been described.
  • imaging devices 1F to 1I according to modifications of the imaging device 1E will be described with reference to FIGS.
  • a part of the linear SMA 53 (acting unit) is disposed in the effective inter-optical region L3 (the working interval 53c of the linear SMA 53 and By combining the inter-lens region S1), it is possible to simultaneously maintain the imaging accuracy, suppress the enlargement of the apparatus, and ensure the deformation amount (drive amount).
  • FIG. 22 is a top view showing an imaging device 1F having two linear SMAs 53 provided in parallel with a predetermined distance in the Y direction (the vertical direction in the drawing) as an action portion of the actuator 5F.
  • FIG. 23 is a top view showing an imaging apparatus 1G having two linear SMAs 53 provided in parallel with a predetermined distance in the XY direction (diagonal direction in the drawing) as an action part of the actuator 5G.
  • the mode in which one linear SMA 53 is used as the action part of the actuator 5E has been described.
  • two linear shapes are used.
  • An imaging device using the SMA 53 as the action part of the actuators 5F and 5G may be used.
  • the action sections 53c of the two linear SMAs 53 (action sections) coupled to the multi-array lens AL are arranged point-symmetrically with respect to the center point PO. It is desirable. This is because, by exhibiting the same deformation amount (driving force) for the two linear SMAs 53, the resultant force can be favorably imparted to the center point PO (center of gravity in the XY plan view) of the multi-array lens AL. The same applies when the imaging apparatus includes three or more linear SMAs 53.
  • FIG. 24 is a top view showing an imaging apparatus 1H having a holder body (hereinafter referred to as “lens holder LH”) that holds the multi-array lens AL in addition to the components of the imaging apparatus 1E of the second embodiment. is there.
  • lens holder LH a holder body
  • FIG. 25 is a side view of the imaging apparatus 1H viewed from the HH section of FIG. 24 when the linear SMA 53 is in the martensite phase.
  • FIG. 26 is a side view of the imaging apparatus 1H viewed from the HH cross section of FIG. 24 when the linear SMA 53 is an austenite phase.
  • FIG. 27 is a side view of the image pickup apparatus 1H viewed from the II cross section of FIG. Further, in FIG. 27, a plurality of unit imaging light beams IR are also drawn in addition to the respective elements constituting the imaging device 1H.
  • the lens holder LH is an annular member having an outer edge and an inner edge that are substantially square in the XY plan view, and the inner edge is a member such as a resin bonded to the outer edge of the multi-array lens AL.
  • a configuration in which the outer edge of the multi-array lens AL and the inner edge of the lens holder LH are bonded together is referred to as a “lens unit LU”.
  • the length in the Z direction of the lens holder LH is longer than the length in the Z direction of the multi-array lens AL, and the upper surface of the lens holder LH is higher than the upper surface of the multi-array lens AL.
  • the multi-array lens AL and the lens holder LH are integrated with the lower surface being lower than the lower surface of the multi-array lens AL.
  • the movable holding portion 4 (upper leaf spring 41, lower leaf spring 42) is stretched between the side wall 3 and the lens holder LH and is held in a state in which a spring force in the ⁇ Z direction is applied to the lens unit LU. To do.
  • Both ends 53a and 53b of the linear SMA 53 are fixed at the same YZ position on the opposite side wall 3 ( ⁇ X side wall 3).
  • a fixed section 53e (hereinafter referred to as “action section 53e”) of the entire length is brought into contact with the lower surface side ( ⁇ Z side) of the lens holder LH in a tensioned state.
  • the linear SMA 53 deforms (extends) in the ⁇ Z direction in response to the spring force in the martensite phase when the actuator 5H is not driven, and bends in the ⁇ Z direction. It will be in the state.
  • the linear SMA 53 shown in FIG. 25 is a linear SMA in which this deformation (extension) has occurred, and the multi-array lens AL is held at the reference position by the deformed linear SMA 53 and the movable holding portion 4.
  • FIG. 26 is a side view showing the imaging device 1E after driving in the + Z direction.
  • the actuator 5H has the linear SMA 53 (action portion), and it is sufficient if the linear SMA 53 is driven from the side wall 3 side to reversibly displace the lens unit LU from the reference position.
  • the SMA 53 (acting part) has a mechanical action on the multi-array lens AL, as well as an indirect action (through the lens holder LH) as in the imaging device 1H of the present modification. Mechanical action).
  • the multi-array lens AL can be prevented from being deformed due to the above action. Is desirable.
  • an imaging apparatus in which an actuator directly acts on the multi-array lens AL such as the imaging apparatuses 1 and 1A to 1G, is desirable in that the apparatus can be reduced in size.
  • the portion of the linear SMA 53 that spans the lens holder LH is arranged.
  • the linear SMA 53 is arranged in the effective optical region L2 at any point in the deformation process of the action portion (linear SMA 53). It should be noted that it is desirable to be designed so that it is not.
  • FIG. 28 is a top view illustrating a schematic configuration of an imaging apparatus 1I using the lever mechanism 54 as the actuator 5I.
  • 29 and 30 are side views showing a schematic configuration of the imaging apparatus 1I as seen from the JJ section in FIG.
  • the lever mechanism 54 mainly includes an arm portion 541 disposed along the X direction so that a distal end portion 541a (+ X direction end portion) is in contact with the lower surface of the multi-array lens AL, and a proximal end of the arm portion 541.
  • the extended portion 542 extending in the Z direction from the portion ( ⁇ X direction end portion), the rotating shaft 543 penetrating in the Y-axis direction with respect to the upper portion of the extended portion 542, and the lower portion of the extended portion 542 A linear SMA 53 that applies a driving force in the + X direction to the extending portion 542.
  • the base end portion of the arm portion 541 and the lower portion of the extending portion 542 are fixed, and these have an inverted L-shape when viewed from the side of the XZ (FIGS. 29 and 30).
  • the rotary shaft 543 is a rod-like member extending along the Y-axis direction, and both ends thereof are fixed to the ⁇ Y side wall 3 respectively. Further, in the central portion, the upper portion of the extending portion 542 is penetrated in the Y-axis direction. For this reason, the extension portion 542 and the arm portion 541 that are integrated with each other can be rotated around the rotation shaft 543 (Y axis) that penetrates the extension portion 542 while maintaining the inverted L-shape. ing.
  • the linear SMA 53 is a member that applies a driving force in the + X direction to the lower portion of the extending portion 542, and both side end portions 53a and 53b are fixed to the same XZ position on the side wall 3 on the ⁇ Y side.
  • a V-shaped groove 544 is provided on the ⁇ X side surface at the lower part of the extended portion 542, and the action section 53f of the linear SMA 53 is stretched over the V-shaped groove 544 in a tensioned state.
  • the conducting wire 51 is connected to the vicinity of both ends 53a and 53b of the linear SMA 53 for the purpose of phase transformation of the linear SMA 53 by energization.
  • the spring force in the ⁇ Z direction applied to the multi-array lens AL by the movable holding portion 4 is connected to the arm portion 541 in contact with the lower surface of the multi-array lens AL and the arm portion 541.
  • the force is applied to the linear SMA 53 as a force in the tangential direction ( ⁇ X direction) with the rotation shaft 543 as the rotation center.
  • the linear SMA 53 shown in FIG. 29 is a linear SMA in a state where this deformation (extension) has occurred, and the multi-array lens AL is brought to the reference position by the lever mechanism 54 having the linear SMA 53 after deformation and the movable holding portion 4. Retained.
  • FIG. 30 is a side view showing the imaging device 1I after driving in the + Z direction.
  • the entire lever mechanism 54 having the arm portion 541, the extending portion 542, the rotating shaft 543, and the linear SMA 53 directly acts on the multi-array lens AL. Functions as a working part.
  • the actuator has an action part, and the action part is driven from the side wall 3 side to reversibly displace the multi-array lens AL from the reference position, and the multi-array lens AL by the action part is sufficient.
  • the action on is a post-conversion action after the direction and magnitude of the original action (the action in the + X direction due to the contraction of the linear SMA 53) is converted by the action force conversion mechanism (the lever mechanism 54 in this embodiment). It doesn't matter.
  • the design of each part is adjusted based on a known principle (for example, Japanese Patent Laid-Open No. 2009-37059).
  • a displacement amount larger than the displacement amount (shrinkage amount) of the linear SMA 53 due to the phase transformation can be applied as the displacement amount (drive amount) of the multi-array lens AL in the optical axis direction.
  • the driving amount of the multi-array lens AL can be sufficiently secured, and the focus function and the zoom function can be improved.
  • an imaging device that does not have an acting force conversion mechanism in this embodiment, the lever mechanism 54
  • the imaging devices 1 and 1A to 1H can be downsized.
  • the imaging apparatus 1I by arranging a part of the lever mechanism 54 (acting part) using the linear SMA 53 (on the + X side of the arm part 541) in the effective inter-optical region L3 ( 28), it is possible to simultaneously maintain the imaging accuracy and suppress the enlargement of the apparatus.
  • the lever mechanism 54 is not arranged in the effective optical region L2 at any point in the deformation (contraction or expansion) process of the linear SMA 53 (the lever mechanism 54 is effective in the effective inter-optical region L3 and the effective optical region L3). It should be noted that “it is desirable to continue to be arranged in the outer optical region L4”.
  • FIG. 31 is a top view schematically showing main components of the imaging apparatus 1J according to the third embodiment.
  • 32 and 33 are side views showing a schematic configuration of the imaging apparatus 1J as seen from the KK cross section of FIG.
  • FIG. 34 is a diagram in which the unit imaging light flux IR is added to FIG.
  • the imaging apparatus 1J includes a voice coil motor mechanism (hereinafter referred to as “VCM mechanism 55”) as an actuator 5J for driving the multi-array lens AL along the optical axis.
  • VCM mechanism 55 voice coil motor mechanism
  • the movable holding portion 4J in this modification is different from the previously described movable holding portion 4 having a spring force (bias force) in the ⁇ Z direction in a state where the multi-array lens AL is held at the reference position. In the state where is held at the reference position, no spring force is applied in the Z direction. In other words, the movable holding portion 4J holds the multi-array lens AL (and the two magnets 551 connected to the lower surface of the multi-array lens AL) at the reference position only with the holding force (FIG. 32).
  • the driving principle of the actuator 5J in the present embodiment does not use a change in elastic force due to phase transformation like the above-described SMA actuator, and it is not necessary to apply a bias force to the actuator at the reference position.
  • the driving principle of the actuator 5J will be described later.
  • the VCM mechanism 55 includes two magnets (permanent magnets) 551 connected to the inter-lens region S1 on the lower surface of the multi-array lens AL, two coils 552 provided on the inner edge of the opposing ⁇ X side wall 3, A power supply unit (not shown).
  • the magnet 551 has a first polarity (for example, N pole) in the + Y direction of FIG. 32 and a second polarity (for example, S pole) in the ⁇ Y direction.
  • a lead wire (not shown) is wound so that an S pole and an N pole are formed along the Y direction near the intermediate height, as shown in FIG. ing.
  • a displacement force along the optical axis direction can be applied to the two magnets 551 by the principle of a so-called linear motor using electromagnetic force.
  • the coil 552 is energized, as shown in FIG. 33, the N pole of the coil 552 and the S pole of the magnet 551 face each other, and the S pole of the coil 552 and the N pole of the magnet 551 face each other.
  • an electromagnetic displacement force as indicated by a broken-line arrow acts on the magnet 551. This displacement force is defined by the magnitude of the current flowing through the two coils 552.
  • the two magnets 551 and the two coils 552 are arranged symmetrically with respect to the multi-array lens AL held by the movable holding portion 4 as viewed from the center point PO in the XY plan view. This is desirable because the propulsive force can be applied more accurately along the optical axis direction (Z direction).
  • the movable holding portion 4J of this modification holds the multi-array lens AL (and the two magnets 551 connected to the lower surface of the multi-array lens AL) at the reference position only by the holding force. (FIG. 32).
  • the VCM mechanism 55 is activated by applying a current to the two coils 552 and the displacement force is applied to the multi-array lens AL, the multi-array lens AL moves to the spring of the movable holding portion 4J according to the displacement force. It is driven along the + Z direction against the force (FIG. 33).
  • the two magnets 551 function as an action unit that directly acts on the multi-array lens AL (gives displacement force).
  • the actuator 5J (VCM mechanism 55) is a drive unit that reversibly displaces the multi-array lens AL from the reference position by driving the two magnets 551 as the action unit from the side wall 3 side where the two coils 552 are fixed.
  • This drive is a remote drive using a remote interaction by electromagnetic force.
  • an iron piece or the like can be used instead of the magnet 551.
  • the actuator is separated from the first portion (the coil 552 in this embodiment) coupled to the frame body FL and the first portion, and the second portion coupled to at least a part of the lens portion LP.
  • a portion (a magnet 551 in the present embodiment), and reversibly displaces the at least part of the lens portion LP from the reference position by electromagnetic remote interaction between the first portion and the second portion. There may be.
  • Zoom adjustment and focus adjustment in the image pickup apparatus 1J are realized by reversibly displacing the multi-array lens AL from the reference position along the optical axis direction (Z direction) by the actuator 5J (VCM mechanism 55).
  • the image pickup apparatus 1J by arranging the two magnets 551 that are the action portions in the effective optical area L3 of the multi-array lens AL (FIG. 34), the image pickup accuracy is maintained and the apparatus size is increased. Deterrence can be achieved at the same time.
  • the actuator 5J of the imaging device 1J according to the third embodiment is integrated with each actuator (the multi-array lens AL and the side wall 3 integrally shown in the first embodiment, the second embodiment, and the modifications thereof). Unlike the actuators arranged), the magnet 551 and the coil 552 which are its constituent elements are arranged separately on the multi-array lens AL and the side wall 3.
  • the actuator 5J (VCM mechanism 55) uses an electromagnetic force generated by energizing the coil 552 as a driving principle, and does not use an elastic force change (deformation) due to deformation unlike the SMA actuator. . Accordingly, the relative positions of the two magnets 551 with respect to the multi-array lens AL are defined when the two magnets 551 are coupled to the multi-array lens AL (at the time of initial design), and may change during the driving of the actuator 5J. Absent.
  • the actuator 5J (VCM mechanism 55) defines the driving force in the Z direction with respect to the multi-array lens AL depending on the energization amount. For this reason, unlike the SMA actuator in which the driving force in the Z direction with respect to the multi-array lens AL is defined by the temperature of the SMA, it is not affected by the residual heat, and thus the controllability is high.
  • the configuration in which the two coils 552 are arranged on the side wall 3 (the inner wall portion of the frame body FL) and the two magnets 551 are arranged on the multi-array lens AL has been described.
  • the arrangement may be reversed, that is, a configuration in which two magnets 551 are arranged on the side wall 3 (inner wall portion of the frame body FL) and two coils 552 are arranged on the multi-array lens AL.
  • Imaging Device 1K ⁇ 4.1 Configuration of Imaging Device 1K> So far, the imaging devices 1, 1A to 1J that reversibly displace the multi-array lens AL from the reference position along the optical axis direction (Z direction) have been described. Hereinafter, unlike the imaging devices 1 and 1A to 1J, the imaging device 1K that reversibly displaces the multi-array lens AL from the reference position along the direction perpendicular to the optical axis (in this embodiment, the X direction). explain.
  • FIG. 35 is a top view schematically showing main components of the imaging apparatus 1K according to the fourth embodiment.
  • FIG. 36 is a side view of the imaging device 1K viewed from the LL cross section of FIG.
  • FIG. 37 is a side view of the imaging apparatus 1K in a state where the multi-array lens AL is driven in the + X direction from the state of FIG. 36 by driving the actuator 5K.
  • a plurality of unit imaging light beams IR are depicted.
  • Actuator 5K includes two linear SMAs 56 and 57 having the same configuration (length, diameter, elastic coefficient, etc.) as an action unit for driving multi-array lens AL along the X direction perpendicular to the optical axis.
  • the multi-array lens AL has two protrusions 71 formed at predetermined intervals in the Y direction for the purpose of bridging the linear SMA 56 on the upper surface (+ Z side) and the Y direction for the purpose of bridging the linear SMA 57. And two protrusions 72 formed at a predetermined interval.
  • the movable holding portion 4K (the upper plate spring 41 and the lower plate spring 42) does not have a bias force along the Z direction as in the above-described movable holding portion 4J, and the multi-array lens AL is formed only by the holding force.
  • the height of the reference position is maintained (FIGS. 36 and 37). This is because the driving direction of the multi-array lens AL by the actuator 5K is along the X direction, and the driving direction is not along the Z direction as in the SMA actuator described above.
  • Both ends 56a and 56b of the linear SMA 56 are fixed to the -X side wall 3, and the wire portion is stretched over the two protrusions 71 on the multi-array lens AL, and is in a tension state.
  • both ends 57a and 57b of the linear SMA 57 are fixed to the + X side wall 3, and the wire portion is bridged between the two protrusions 72 on the multi-array lens AL to be in a tension state. .
  • both end portions 56a and 56b of the linear SMA 56 and both end portions 57a and 57b of the linear SMA 57 are fixed at the same height (Z direction position). Further, the end portion 56a of the linear SMA 56 and the end portion 57a of the linear SMA 57 are arranged at the same position in the Y direction. Similarly, the end portion 56b of the linear SMA 56 and the end portion 57b of the linear SMA 57 are arranged at the same position in the Y direction.
  • the two linear SMAs 56 and 57 having the same configuration are arranged symmetrically with respect to the center point PO of the multi-array lens AL in the XY plan view, so that the multi-array lens AL is provided. It is spanned between the provided projections 71 and 72.
  • the linear SMA 56 has two protrusions.
  • first acting force the elastic force acting on the multi-array lens AL on the ⁇ X side
  • second acting force the elastic force acting on the balance is balanced at the reference position.
  • each of the linear SMAs 56 and 57 is provided with a conducting wire 51 and a power supply unit (not shown).
  • the multi-array lens AL is driven along the X direction to a position where the first acting force and the second acting force can be balanced.
  • FIG. 37 is a side view of the imaging apparatus 1K in a state where only the linear SMA 57 is energized and heated and the multi-array lens AL is driven along the + X direction.
  • the linear SMA 57 returns to a low temperature and low elastic modulus (martensitic phase), and the linear SMA 56 , 57 have the same elastic modulus in the martensite phase, and the multi-array lens AL returns to the reference position (FIG. 36) where the first acting force and the second acting force are balanced.
  • the linear SMAs 56 and 57 function as an operation unit that directly acts on the multi-array lens AL.
  • the multi-array lens AL can be driven (displaced) along the direction orthogonal to the optical axis by driving the actuator 5K. Therefore, the actuator 5K is effective for realizing various functions for displacing the multi-array lens AL in a direction orthogonal to the optical axis direction, such as a camera shake correction function.
  • the configuration in which the multi-array lens AL is driven along the X direction by the actuator 5K has been described, but this may be driven along the Y direction.
  • the action section 53c which is a part of the linear SMAs 56 and 57, is arranged in the effective inter-optical region L3.
  • the linear SMA 53 can be designed to reduce the space disposed in the effective optical outside region L4 without being disposed in the effective optical region L2, and can be designed to be long to a certain extent. Suppression and securing of the deformation amount (drive amount) can be achieved at the same time.
  • the linear SMA 56 expands and contracts due to a phase transformation that occurs when the actuator 5K is driven. Along with this expansion and contraction, the two end portions 56a and 56b of the linear SMA 56 fixed to the side wall 3 and the two projections 71 over which the linear SMA 56 is bridged are squared in an XY plan view. The shape (trapezoid shown in FIG. 35) is deformed. The same applies to the linear SMA 57.
  • the action part is designed not to be disposed in the effective optical region L2 at any point in the deformation process of the action part (linear SMAs 56 and 57).
  • FIG. 38 is a top view schematically showing main components of the imaging apparatus 1L according to the present modification.
  • FIG. 39 is a side view of the imaging device 1L viewed from the MM cross section of FIG.
  • FIG. 40 is a side view of the imaging apparatus 1L in a state where the multi-array lens AL is driven in the ⁇ X direction from the state of FIG. 39 by driving the actuator 5L. 39 and 40, a plurality of unit imaging light beams IR are depicted.
  • the movable holding portion 4L does not have a bias force along the Z direction, and holds the multi-array lens AL at the height of the reference position only by the holding force (FIG. 39, FIG. 40).
  • the actuator 5L is a rod-shaped member extending in the X direction, and a + X side end portion 581a thereof is fixed to the side wall 3.
  • the actuator 5L is a rod-shaped member extending in the X direction, and the + X side end portion 582a is a piezoelectric element.
  • the ⁇ X side end 582b of the friction member 582 is in contact with the upper surface of the multi-array lens AL. For this reason, the actuator 5L is driven (the piezoelectric element 581 is energized), and the piezoelectric element 581 provided between the frame body FL and the multi-array lens AL is expanded and contracted along the X direction according to the energization amount.
  • the multi-array lens AL can be driven along the X direction using the frictional force between the friction member 582 and the multi-array lens AL.
  • the imaging apparatus 1L of the present modification by maintaining a part of the piezoelectric element 581 and the friction member 582 that are the working parts in the effective inter-optical region L3, it is possible to simultaneously maintain the imaging accuracy and suppress the enlargement of the apparatus. be able to.
  • An imaging apparatus 1M according to the fifth embodiment includes a single lens 8 (FIGS. 41 and 42) in addition to the multi-array lens AL as its lens portion LP, and the target to be driven by the actuator 5M is not a multi-array lens AL but a single lens. 8 is different from the above-described imaging devices 1, 1A to 1L.
  • FIG. 41 is a side view of the imaging apparatus 1M viewed from the XZ plane.
  • FIG. 42 is a side view of the imaging apparatus 1M viewed from the YZ plane. Further, FIG. 42 illustrates a plurality of unit imaging light beams IR passing through the multi-array lens AL and an outgoing light beam OR that is incident on the plurality of unit imaging light beams IR and is emitted from the single lens 8.
  • the imaging apparatus 1M includes, as a lens portion LP, a multi-array lens AL disposed in a window WD portion and coupled to a side wall 3 (an inner wall portion of the frame body FL), and a movable holding portion.
  • 4M and the actuator 5M have a single lens 8 held in a hollow space L1 (a space surrounded by the multi-array lens AL and the frame body FL).
  • the measurement light incident on the imaging device 1M from the window WD is received by the imaging device 6 through the multi-array lens AL and the single lens 8 in order.
  • the single lens 8 (a part of the lens portion LP) is optically arranged in series with the multi-array lens AL and functions as a predetermined optical element that cooperates optically with the multi-array lens AL. To do.
  • the lens holder LH2 for holding the single lens 8 is provided on the outer edge of the single lens 8 in the XY plan view.
  • the lens holder LH ⁇ b> 2 is an annular member whose outer edge and inner edge are substantially circular in an XY plan view, and whose inner edge is a member such as a resin bonded to the outer edge of the single lens 8.
  • an integrated configuration in which the outer edge of the single lens 8 and the inner edge of the lens holder LH2 are bonded together is referred to as “lens unit LU2”.
  • the movable holding portion 4M (two upper leaf springs 41 and two lower leaf springs 42) is bridged between the side wall 3 and the lens holder LH, and the spring force in the + Z direction with respect to the lens unit LU2 at the reference position. Is held in the state given.
  • Both ends 59a and 59b of the linear SMA 59 are fixed at the same YZ position on the opposite side wall 3 ( ⁇ X side wall 3). Further, a fixed section 59c (hereinafter referred to as “action section 59c”) of the entire length is brought into contact with the upper surface side (+ Z side) of the lens unit LU2 biased in the + Z direction by the movable holding portion 4M. .
  • the linear SMA 59 deforms (extends) in the + Z direction according to the spring force in the martensite phase in a state where the actuator 5M is not driven, and in the + Z direction in a tension state. It will be in a bent state.
  • the lens unit LU2 is held at the reference position by the action of the deformed linear SMA 59 in the ⁇ Z direction and the action of the movable holding portion 4M in the + Z direction.
  • the linear SMA 59 when the linear SMA 59 is energized by a power supply unit and a conductive wire (not shown), the linear SMA 59 is expanded and contracted according to the principle of the SMA actuator described above, and the lens unit LU2 is driven along the optical axis direction (Z direction).
  • the multi-array lens AL is coupled to the side wall 3 (inner wall portion of the frame body FL) and fixed, while the single lens 8 is moved to the optical axis (Z by the movable holding unit 4 and the actuator 5M. (Axis) is drivable along the direction. For this reason, zoom adjustment and focus adjustment of the image pickup apparatus 1M are realized by driving the single lens 8 by the actuator 5M.
  • the actuator 5M is driven by the lens unit LU2 (single lens 8) as in the imaging device 1M of the present embodiment, a part of the linear SMA 59 serving as the action part of the actuator 5M is multi-arrayed.
  • the lens AL By disposing the lens AL in the effective inter-optical region L3, it is possible to simultaneously maintain the imaging accuracy, suppress the enlargement of the apparatus, and ensure the deformation amount (drive amount).
  • the imaging apparatus 1M of the fifth embodiment the case where the single lens 8 that is a part of the lens portion LP among the lens portions LP including the multi-array lens AL and the single lens 8 is driven has been described.
  • the present invention can be applied to a case where a single lens is fixed and a multi-array lens is driven and displaced, or a case where the entire composite lens portion is driven and displaced, for a lens portion in which an array lens and a single lens are combined. Is applicable.
  • the present invention can also be applied to a lens portion having a plurality of multi-array lenses without a single lens.

Abstract

Selon l'invention, une partie lentille (LP) d'un dispositif d'imagerie (1), possède un réseau multi-lentilles (AL) formé par alignement d'une pluralité de lentilles unitaires (LE). Un alliage à mémoire de forme (50) en bande déplaçant le réseau multi-lentilles (AL) de manière réversible depuis une position de référence, est placé à l'intérieur d'un intervalle d'alignement spatial (région entre lumières actiniques (L3)) d'une pluralité de faisceaux d'imagerie unitaires (IR) traversant individuellement la pluralité de lentilles unitaires (LE). L'alliage à mémoire de forme (50) en bande n'étant pas présent à l'intérieur de régions de lumière actinique (L2) du réseau multi-lentilles (AL), il n'y a aucune conséquence sur les faisceaux d'imagerie unitaires, et la précision d'imagerie est préservée. Enfin, il est possible de réduire un espacement dans lequel est placé l'alliage à mémoire de forme (50) en bande dans une région hors lumières actiniques (L4) du réseau multi-lentilles (AL), et la dimension du dispositif n'est donc pas augmentée.
PCT/JP2014/065577 2013-07-11 2014-06-12 Dispositif d'imagerie WO2015005055A1 (fr)

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
US10716912B2 (en) 2015-03-31 2020-07-21 Fisher & Paykel Healthcare Limited User interface and system for supplying gases to an airway
WO2021000160A1 (fr) * 2019-06-30 2021-01-07 瑞声光学解决方案私人有限公司 Module de lentille
US11324908B2 (en) 2016-08-11 2022-05-10 Fisher & Paykel Healthcare Limited Collapsible conduit, patient interface and headgear connector

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JPH0643517A (ja) * 1992-07-24 1994-02-18 Canon Inc カメラ用像振れ防止装置
JPH07152096A (ja) * 1993-11-30 1995-06-16 Canon Inc 複眼撮像系
JP2004096358A (ja) * 2002-08-30 2004-03-25 Olympus Corp 撮像素子
JP2009134292A (ja) * 2007-11-07 2009-06-18 Seiko Instruments Inc 駆動モジュールおよびそれを備える電子機器
JP2009169025A (ja) * 2008-01-15 2009-07-30 Sony Corp 撮像装置およびデジタルカメラ
JP2011023603A (ja) * 2009-07-16 2011-02-03 Fujifilm Corp 露光装置
WO2012099127A1 (fr) * 2011-01-17 2012-07-26 株式会社オルタステクノロジー Lentille à cristaux liquides, procédé d'excitation de lentille à cristaux liquides, unité de lentille, module de caméra et appareil médical de type capsule
JP2012177773A (ja) * 2011-02-25 2012-09-13 Toshiba Corp 光学素子、固体撮像装置、携帯情報端末、および表示装置
JP2013061549A (ja) * 2011-09-14 2013-04-04 Tokyo Institute Of Technology 可変焦点レンズ及びその焦点制御方法

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Publication number Priority date Publication date Assignee Title
JPH0643517A (ja) * 1992-07-24 1994-02-18 Canon Inc カメラ用像振れ防止装置
JPH07152096A (ja) * 1993-11-30 1995-06-16 Canon Inc 複眼撮像系
JP2004096358A (ja) * 2002-08-30 2004-03-25 Olympus Corp 撮像素子
JP2009134292A (ja) * 2007-11-07 2009-06-18 Seiko Instruments Inc 駆動モジュールおよびそれを備える電子機器
JP2009169025A (ja) * 2008-01-15 2009-07-30 Sony Corp 撮像装置およびデジタルカメラ
JP2011023603A (ja) * 2009-07-16 2011-02-03 Fujifilm Corp 露光装置
WO2012099127A1 (fr) * 2011-01-17 2012-07-26 株式会社オルタステクノロジー Lentille à cristaux liquides, procédé d'excitation de lentille à cristaux liquides, unité de lentille, module de caméra et appareil médical de type capsule
JP2012177773A (ja) * 2011-02-25 2012-09-13 Toshiba Corp 光学素子、固体撮像装置、携帯情報端末、および表示装置
JP2013061549A (ja) * 2011-09-14 2013-04-04 Tokyo Institute Of Technology 可変焦点レンズ及びその焦点制御方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10716912B2 (en) 2015-03-31 2020-07-21 Fisher & Paykel Healthcare Limited User interface and system for supplying gases to an airway
US11904097B2 (en) 2015-03-31 2024-02-20 Fisher & Paykel Healthcare Limited User interface and system for supplying gases to an airway
US11324908B2 (en) 2016-08-11 2022-05-10 Fisher & Paykel Healthcare Limited Collapsible conduit, patient interface and headgear connector
WO2021000160A1 (fr) * 2019-06-30 2021-01-07 瑞声光学解决方案私人有限公司 Module de lentille

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