WO2013021903A1 - 駆動装置、レンズモジュールおよび撮像装置 - Google Patents
駆動装置、レンズモジュールおよび撮像装置 Download PDFInfo
- Publication number
- WO2013021903A1 WO2013021903A1 PCT/JP2012/069679 JP2012069679W WO2013021903A1 WO 2013021903 A1 WO2013021903 A1 WO 2013021903A1 JP 2012069679 W JP2012069679 W JP 2012069679W WO 2013021903 A1 WO2013021903 A1 WO 2013021903A1
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- WIPO (PCT)
- Prior art keywords
- ion exchange
- exchange resin
- lens
- polymer actuator
- activation energy
- Prior art date
Links
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- NJMWOUFKYKNWDW-UHFFFAOYSA-N 1-ethyl-3-methylimidazolium Chemical compound CCN1C=C[N+](C)=C1 NJMWOUFKYKNWDW-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/85—Piezoelectric or electrostrictive active materials
- H10N30/857—Macromolecular compositions
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
- G02B7/102—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens controlled by a microcomputer
-
- G—PHYSICS
- 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
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/20—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators
-
- 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
- G03B2205/0046—Movement of one or more optical elements for zooming
-
- 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
- G03B2205/0084—Driving means for the movement of one or more optical element using other types of actuators
Definitions
- the present disclosure relates to a driving device using a polymer actuator element, and a lens module and an imaging device including such a driving device.
- a method of moving a lens in a lens module is generally performed by using a voice coil motor or a stepping motor as a drive unit.
- a predetermined actuator element as a drive unit.
- Examples of such actuator elements include polymer actuator elements (see Patent Documents 1 to 3).
- the polymer actuator element for example, an ion exchange resin film is sandwiched between a pair of electrodes.
- an ion exchange resin film is displaced in a direction perpendicular to the film surface when a potential difference is generated between the pair of electrodes.
- a drive device includes one or more polymer actuator elements configured using an ion exchange resin, and the ion exchange resin contains operating ions having activation energy equal to or lower than a predetermined threshold. Is.
- a lens module according to an embodiment of the present disclosure includes a lens and the driving device according to the embodiment of the present disclosure that drives the lens.
- An imaging device includes a lens, an imaging element that acquires an imaging signal formed by the lens, and the driving device according to the embodiment of the present disclosure that drives the lens. It is.
- the ion exchange resin in the polymer actuator element contains operating ions having activation energy equal to or lower than a predetermined threshold. Therefore, even in an environment such as low humidity and high temperature, a decrease in ion conductivity in the ion exchange resin can be suppressed.
- the ion exchange resin in the polymer actuator element contains the operating ions having the activation energy equal to or lower than the predetermined threshold value. It is possible to suppress a decrease in ionic conductivity in an environment such as high temperature. Therefore, it is possible to suppress deterioration in characteristics according to the surrounding environment (for example, reduction in response speed of the drive device in a low humidity environment, reduction in displacement of the drive device after storage in a high temperature environment, etc.).
- FIG. 4 is a schematic diagram illustrating a side configuration and a planar configuration of the lens module illustrated in FIG. 3. It is sectional drawing showing the detailed structure of the polymer actuator element shown in FIG. It is sectional drawing showing the detailed structure of a part of polymer actuator element shown in FIG. 3, the member for fixation, and a fixed electrode.
- FIG. 1 and 2 are perspective views of a schematic configuration of a mobile phone with an imaging function (mobile phone 8) as an example of an electronic device including an imaging device (an imaging device 2 described later) according to an embodiment of the present disclosure. It is represented by.
- the two casings 81A and 81B are connected to each other via a hinge mechanism (not shown) so as to be foldable.
- a plurality of various operation keys 82 are disposed on one surface of the casing 81A, and a microphone 83 is disposed at the lower end thereof.
- the operation key 82 is for receiving a predetermined operation by a user (user) and inputting information.
- the microphone 83 is for inputting a user's voice during a call or the like.
- a display unit 84 using a liquid crystal display panel or the like is disposed on one surface of the casing 81B, and a speaker 85 is disposed on the upper end thereof.
- various kinds of information such as radio wave reception status, remaining battery level, telephone number of the other party, contents registered as a telephone directory (the telephone number and name of the other party), outgoing call history, incoming call history, etc. Information is displayed.
- the speaker 85 is for outputting the voice of the other party during a call or the like.
- a cover glass 86 is disposed on the other surface of the casing 81A, and the imaging device 2 is provided at a position corresponding to the cover ballast 86 inside the casing 81A.
- the imaging device 2 includes a lens module 4 disposed on the object side (cover glass 86 side) and an imaging element 3 disposed on the image side (inside the housing 81A).
- the imaging element 3 is an element that acquires an imaging signal formed by a lens (a lens 40 described later) in the lens module 4.
- the imaging device 3 is composed of, for example, an image sensor on which a charge coupled device (CCD: Charge-Coupled Device) or CMOS (Complementary Metal-Oxide Semiconductor) is mounted.
- CCD Charge-Coupled Device
- CMOS Complementary Metal-Oxide Semiconductor
- FIG. 3 is a perspective view showing the configuration of the main part of the imaging device 2
- FIG. 4 is an exploded perspective view showing the configuration of the lens module 4 in the imaging device 2.
- FIG. 5 schematically shows a schematic configuration of the lens module 4 in (A) a side view (ZX side view) and (B) a plan view (XY plan view).
- the lens module 4 includes a support member 11, a polymer actuator element 131, and a lens holding member 14 in order from the image side (imaging element 3 side) to the object side along the optical axis Z1 (along the positive direction on the Z axis). And a lens 40 and a polymer actuator element 132.
- illustration of the lens 40 is abbreviate
- the lens module 4 also includes a fixing member 12, connecting members 151A, 151B, 152A, and 152B, fixed electrodes 130A and 130B, a pressing member 16, and Hall elements 17A and 17B.
- the lens module 4 excluding the lens 40 corresponds to a specific example of “driving device (lens driving device)” in the present disclosure.
- the support member 11 is a base member (base) for supporting the entire lens module 4 and is made of a hard resin material such as a liquid crystal polymer.
- the fixing member 12 is a member for fixing one end of each of the polymer actuator elements 131 and 132, and is made of a hard resin material such as a liquid crystal polymer.
- the fixing member 12 is arranged from the image side (lower side in FIGS. 3 and 4) toward the object side (upper side), a lower fixing member 12D, a central (middle) fixing member 12C, and an upper fixing. It consists of three members of the member 12U for use. Between the lower fixing member 12D and the central fixing member 12C, one end of the polymer actuator element 131 and one end of the fixed electrodes 130A and 130B are respectively sandwiched.
- the center fixing member 12C is formed with an opening 12C0 for partially sandwiching a part of the lens holding member 14 (a part of a holding part 14B described later). Thereby, a part of the lens holding member 14 can move in the opening 12C0, so that the space can be used effectively and the lens module 4 can be downsized.
- the fixed electrodes 130A and 130B supply a driving voltage Vd from voltage application means (a voltage supply unit 19 described later) to the electrode films (the electrode films 52A and 52B described above) in the polymer actuator elements 131 and 132. Electrode.
- Each of these fixed electrodes 130A and 130B is made of, for example, gold (Au) or gold-plated metal, and has a “U” shape.
- the fixed electrodes 130A and 130B sandwich the upper and lower sides (both side surfaces along the Z axis) of the central fixing member 12C, and are parallel to the pair of polymer actuator elements 131 and 132 with fewer wires. It is possible to apply the same voltage to. Further, when the fixed electrodes 130A and 130B are made of a metal material plated with gold, deterioration of contact resistance due to surface oxidation or the like can be prevented.
- the lens holding member 14 is a member for holding the lens 40 and is made of, for example, a hard resin material such as a liquid crystal polymer.
- the lens holding member 14 is arranged so that the center thereof is on the optical axis Z1, and holds an annular holding portion 14B that holds the lens 40, and holds the holding portion 14B and a holding portion 14B and a connecting member 151A described later. , 151B, 152A, and 152B.
- the holding portion 14 ⁇ / b> B is disposed between drive surfaces described later in the pair of polymer actuator elements 131 and 132.
- Each of the polymer actuator elements 131 and 132 has a drive surface (drive surface on the XY plane) orthogonal to the optical axis Z1 of the lens 40, and is arranged so that the drive surfaces face each other along the optical axis Z1.
- These polymer actuator elements 131 and 132 are for driving the lens holding member 14 (and the lens 40) along the optical axis Z1 via connecting members 151A, 151B, 152A, and 152B, which will be described later.
- these polymer actuator elements 131 and 132 are each provided with a wide portion (width W21) on the fixing member 12 side and a movable side (coupling members 151A, 151B, 152A, and 152B). Side) narrow portion (width W22).
- the detailed configuration of the polymer actuator elements 131 and 132 will be described later (FIGS. 6 and 7).
- the connecting members 151A, 151B, 152A, and 152B are members for connecting (connecting) each other end of the polymer actuator elements 131 and 132 and the end of the connecting portion 14A to each other.
- the connecting members 151A and 151B connect the lower end of the connecting portion 14A and the other end of the polymer actuator element 131, respectively, and the connecting members 152A and 152B respectively connect the upper end of the connecting portion 14A and the polymer.
- the actuator element 132 is connected to the other end.
- Each of these connecting members 151A, 151B, 152A, 152B is made of a flexible film such as a polyimide film, for example, and is flexible and has a rigidity (bending rigidity) equal to or less than (preferably the same as) each polymer actuator element 131, 132. It is desirable to consist of materials. As a result, a degree of freedom in which the connecting members 151A, 151B, 152A, and 152B bend in the direction opposite to the bending direction of the polymer actuator elements 131 and 132 is created.
- the cross-sectional shape of the cantilever made of becomes an S-shaped curve.
- the connecting portion 14A can be translated in the Z-axis direction, and the holding portion 14B (and the lens 40) is driven in the Z-axis direction while maintaining a parallel state with respect to the support member 11. It becomes like this.
- a spring constant can be used as the rigidity (bending rigidity).
- Hall elements 17A and 17B are elements used to detect the amount of movement (displacement) of the lens holding member 14, and include, for example, a combination of a Hall element and a magnet.
- the voltage supply unit 19 drives (deforms) the polymer actuator elements 131 and 132 by supplying the driving voltage Vd to the polymer actuator elements 131 and 132. belongs to.
- Such a voltage supply part 19 consists of an electric circuit using a semiconductor element etc., for example. The details of the driving operation of the polymer actuator elements 131 and 132 by the voltage supply unit 19 will be described later (FIG. 8).
- FIG. 6 shows a cross-sectional configuration (ZX cross-sectional configuration) of the polymer actuator elements 131 and 132.
- the polymer actuator elements 131 and 132 have a cross-sectional structure in which a pair of electrode films 52A and 52B are formed on both surfaces of an ion conductive polymer compound film 51 (hereinafter simply referred to as polymer compound film 51). .
- the polymer actuator elements 131 and 132 include a pair of electrode films 52A and 52B and the polymer compound film 51 inserted between the electrode films 52A and 52B.
- the polymer actuator elements 131 and 132 and the electrode films 52A and 52B may be covered with an insulating protective film made of a highly elastic material (for example, polyurethane).
- the electrode film 52A is electrically connected to the fixed electrode 130B on the lower fixing member 12D side.
- the membrane 52B is electrically connected to the fixed electrode 130AB on the central fixing member 12C side.
- the electrode film 52A is electrically connected to the fixed electrode 130A on the center fixing member 12C side, and the electrode film 52B is electrically connected to the fixed electrode 130B on the upper fixing member 12U side.
- the members and electrodes from the fixed electrode 130B on the lower fixing member 12D side to the fixed electrode 130B on the upper fixing member 12U side are respectively shown in FIG.
- the member 16 (leaf spring) is fixed so as to be sandwiched at a constant pressure.
- the polymer actuator elements 131 and 132 are not destroyed, and even when these polymer actuator elements 131 and 132 are deformed, stable electrical connection is possible.
- the polymer compound film 51 is curved when a predetermined potential difference is generated between the electrode films 52A and 52B.
- the polymer compound film 51 is impregnated with an ionic substance.
- the “ionic substance” here refers to all ions capable of conducting in the polymer compound film 51, and specifically, hydrogen ions, metal ions alone, or their cations and / or anions. It means one containing an ion and a polar solvent, or one containing a cation and / or an anion which is itself liquid, such as an imidazolium salt. Examples of the former include a cation and / or anion obtained by solvating a polar solvent, and examples of the latter include an ionic liquid.
- Examples of the material constituting the polymer compound film 51 include an ion exchange resin having a skeleton made of a fluororesin or a hydrocarbon.
- the ion exchange resin is preferably a cation exchange resin when impregnated with a cation substance, and is preferably an anion exchange resin when impregnated with an anion substance.
- the cation exchange resin examples include those into which an acidic group such as a sulfonic acid group or a carboxyl group has been introduced.
- an acidic group such as a sulfonic acid group or a carboxyl group
- Specific examples include polyethylene having an acidic group, polystyrene having an acidic group, or a fluororesin having an acidic group.
- the fluororesin which has a sulfonic acid group or a carboxylic acid group is preferable, for example, Nafion (made by DuPont) is mentioned.
- the cationic substance impregnated in the polymer compound film 51 may be any type such as organic or inorganic.
- various forms such as simple metal ions, those containing metal ions and water, and those containing organic cations and water are applicable.
- the metal ions include light metal ions such as lithium ions (Li + ).
- an organic cation an alkyl ammonium ion etc. are mentioned, for example.
- cations such as hydrogen ions (H + ) are also included. These cations exist as hydrates in the polymer compound film 51. Therefore, in the case where the polymer compound film 51 is impregnated with a cation substance including cation and water, the polymer actuator elements 131 and 132 are sealed as a whole to suppress water volatilization. Preferably it is.
- the electrode films 52A and 52B facing each other with the polymer compound film 51 in between each contain one type or two or more types of conductive materials.
- the electrode films 52A and 52B are preferably those in which conductive material powders are bound together by an ion conductive polymer. This is because the flexibility of the electrode films 52A and 52B is enhanced.
- Carbon powder is preferred as the conductive material powder. This is because the conductivity is high and the specific surface area is large, so that a larger deformation amount can be obtained.
- As the carbon powder ketjen black is preferable.
- the ion conductive polymer is preferably the same as the constituent material of the above-described polymer compound film 51 (here, including an ion exchange resin).
- the electrode films 52A and 52B are formed as follows, for example. That is, a coating material in which a conductive material powder and an ion conductive polymer are dispersed in a dispersion medium is applied to both surfaces of the polymer compound film 51 and then dried. A film-like material containing conductive material powder and ion conductive polymer may be pressure-bonded to both surfaces of the polymer compound film 51.
- the electrode films 52A and 52B may have a multilayer structure. In that case, in order from the polymer compound film 51 side, a layer in which conductive material powders are bound together by an ion conductive polymer, a metal layer, It is preferable to have a laminated structure. This is because the potential approaches a more uniform value in the in-plane direction of the electrode films 52A and 52B, and better deformation performance can be obtained. Examples of the material constituting the metal layer include noble metals such as gold and platinum. The thickness of the metal layer is arbitrary, but it is preferable that the electrode films 52A and 52B are continuous films so that the potential is uniform. Examples of the method for forming the metal layer include plating, vapor deposition, and sputtering.
- the size (width and length) of the polymer compound film 51 is the size and weight of the object to be driven (here, the lens holding member 43 and the like), or the amount of displacement (deformation) required for the polymer compound film 51. It can be set arbitrarily according to.
- the displacement amount of the polymer compound film 51 is set in accordance with, for example, the required displacement amount (movement amount along the Z-axis direction) of the driven object.
- the polymer actuator elements 131 and 132 of the present embodiment are configured using an ion exchange resin containing ions (operation ions) having activation energy equal to or lower than a predetermined threshold.
- ion exchange resin containing ions operation ions
- the polymer actuator elements 131 and 132 are (electrode film 52A made of a mixed layer of conductive material and ion exchange resin) / (polymer compound film 51 including ion exchange resin) / (conductive material and ion).
- electrode film 52A made of a mixed layer of conductive material and ion exchange resin
- polymer compound film 51 including ion exchange resin conductive material and ion.
- the electrode film 52B composed of a mixed layer with an exchange resin, at least one of these three layers, preferably all three layers contain such working ions. Is used.
- the above-mentioned activation energy means energy that is at least required when operating ions move from one functional group in the ion conductive resin to another functional group.
- examples of the working ion having such an activation energy include a hydrogen ion (H + ) or a lithium ion (Li + ). It is done.
- lithium ions are an example of operating ions with an activation energy of 0.20 [eV] or less
- hydrogen ions are examples of operating ions with an activation energy of 0.10 [eV] or less. It is.
- the activation energy of activation ions (activation energy at the time of ion conduction) Ea in such an ion exchange resin is defined as follows. That is, first, the response speed V of the polymer actuator elements 131 and 132 is defined by the following equation (1) using the activation energy Ea of the operating ions in the ion exchange resin (Arrhenius law).
- A is a constant (frequency factor) independent of temperature
- R is a gas constant
- T is an absolute temperature.
- the activation energy Ea is a straight line in a graph (so-called Arrhenius plot) in which the horizontal axis represents the inverse of the product (RT) of the gas constant R and the absolute temperature T, and the logarithm (lnV) of the response speed V represents the vertical axis. It is obtained from the absolute value of the slope of. As can be seen from the equation (2), lnA is obtained from the intercept of the vertical axis on the Arrhenius plot.
- the ion exchange equivalent mass (EW (Equivalent Weight) value) in the ion exchange resin containing the working ions having the activation energy is 800 [g / eq] or less. Is desirable. In such a configuration, although details will be described later, it is possible to prevent a decrease in the amount of displacement after being stored at a high temperature for a long period of time, while at the same time preventing a decrease in response speed at low humidity.
- FIG. 9 schematically shows the operation of these polymer actuator elements 131 and 132 using cross-sectional views.
- a material containing a cation and a polar solvent is used as a cation substance.
- the polymer actuator elements 131 and 132 in the state where no voltage is applied are flat without being curved because the cationic substance is dispersed almost uniformly in the polymer compound film 51 (FIG. 9A).
- the polymer actuator elements 131 and 132 exhibit the following behavior. That is, for example, when a predetermined driving voltage Vd is applied between the electrode films 52A and 52B so that the electrode film 52A has a negative potential and the electrode film 52B has a positive potential, the cation is solvated with the polar solvent. To move to the electrode film 52A side.
- a predetermined drive voltage Vd is applied between the electrode films 52A and 52B so that the electrode film 52A has a positive potential and the electrode film 52B has a negative potential from the voltage non-application state shown in FIG.
- the cation moves to the electrode film 52B side in a state solvated with the polar solvent.
- the electrode film 52A side contracts and the electrode film 52B side swells, so that the polymer actuator elements 131 and 132 are curved toward the electrode film 52A as a whole.
- FIG. 10 is a side view (ZX side view) showing the operation of the lens module 4 in the image pickup apparatus 2, where (A) shows the state before the operation and (B) shows the state after the operation. Show.
- the lens holding member 14 is driven by the pair of polymer actuator elements 131 and 132, so that the lens 40 is It can move along the optical axis Z1.
- the lens 40 is driven along the optical axis Z1 by the driving device (lens driving device) using the polymer actuator elements 131 and 132.
- deterioration in the characteristics of the polymer actuator element in accordance with the surrounding environment described above include a reduction in displacement (deformation amount) after storage in a high temperature environment. This is thought to be due to denaturation of functional groups in the ion-exchange resin (Shigeaki Morita and Kuniyuki Kitagawa, "Temperature-dependentstructure changes in Nafion ionomer studied by PCMW2D IR correlation spectroscopy", Journal of Molecular Structure , 974 (2010), pp 56-59). It is known that when a functional group is modified by this dehydration reaction, the functional group does not contribute to ionic conduction. On the other hand, when the number of functional groups contributing to ionic conduction is less than a certain amount, the distance between the functional groups is increased, and there is a problem that the ionic conductivity is rapidly lowered.
- the polymer actuator elements 131 and 132 of the present embodiment are configured using an ion exchange resin containing ions (operation ions) having activation energy equal to or lower than a predetermined threshold.
- ion exchange resin containing ions operation ions
- Ion exchange resins containing working ions with energy are used.
- a decrease in ion conductivity in the ion exchange resin can be suppressed even under the above-described environment such as low humidity and high temperature.
- the characteristics are reduced according to the surrounding environment (for example, as described above, the response speed is lowered in a low humidity environment, and the displacement is reduced after storage in a high temperature environment. Etc.) is suppressed.
- FIGS. 11A to 11D show experimental results for response speeds according to Examples 1 and 2 and Comparative Examples 1 and 2.
- FIG. 11A shows (1000 / absolute in the example (Example 1)) in which hydrogen ions (H + ) are used as the operating ions in the ion exchange resin in the polymer actuator elements 131 and 132.
- the relationship between the temperature T) and the response speed V (Arrhenius plot) is shown.
- FIG. 11B shows an Arrhenius plot in an example (Example 2) using lithium ions (Li + ) as operating ions in the ion exchange resin.
- FIG. 11A shows (1000 / absolute in the example (Example 1)) in which hydrogen ions (H + ) are used as the operating ions in the ion exchange resin in the polymer actuator elements 131 and 132.
- the relationship between the temperature T) and the response speed V (Arrhenius plot) is shown.
- FIG. 11B shows an Arrhenius plot in an example (Example 2) using lithium
- FIG. 11C shows an Arrhenius plot in a comparative example (Comparative Example 1) using sodium ions (Na + ) as operating ions in the ion exchange resin.
- FIG. 11D shows a comparative example in which EMIM (1-Ethyl-3-methylimidazolium) ion (EMIM + ), which is a general organic cation used in an ionic liquid, is used as an operating ion in an ion exchange resin.
- the Arrhenius plot in the comparative example 2 is shown.
- a response speed V average response speed
- the value at the tip of the element was used.
- the response speed V (30) of the polymer actuator element tends to increase as the operating ion has a smaller activation energy Ea (30).
- Ea activation energy
- the effective length of the polymer actuator element is around 5 mm from the outer dimensions thereof, and from various conditions necessary for focus adjustment control, The amount of displacement is preferably about 0.3 mm.
- the full stroke movement time of the lens is 1 second or less from the time allowed until the focus adjustment control is completed. Therefore, the response speed of the polymer actuator element is required to be 0.3 mm / second or more.
- the ion exchange resin in the polymer actuator elements 131 and 132 contains operating ions having activation energy equal to or lower than a predetermined threshold value, it can be used in an environment such as low humidity or high temperature. Decrease in ionic conductivity in can be suppressed. Therefore, it is possible to suppress deterioration in characteristics according to the surrounding environment (for example, reduction in response speed of the drive device in a low humidity environment, reduction in displacement of the drive device after storage in a high temperature environment, etc.).
- the connecting portion 14A and the connecting members 151A, 151B, 152A, and 152B described in the above embodiments and the like may not be provided depending on circumstances.
- the said embodiment etc. demonstrated the case where the one end side of the polymer actuator elements 131 and 132 was directly fixed by the fixing member 12, it is not restricted to this case. That is, one end side of the polymer actuator element may be indirectly fixed (via a fixed electrode or the like) by a fixing member.
- the number of polymer actuator elements may be one or three or more.
- the shape of the polymer actuator element is not limited to that shown in the above embodiment, and the laminated structure is not limited to that described in the above embodiment, and can be changed as appropriate. It is. Further, the shape, material, and the like of each member in the lens module (driving device) are not limited to those described in the above embodiments.
- the lens driving device that drives the lens along the optical axis is described as an example of the driving device of the present disclosure.
- the present invention is not limited to this, and for example, the lens driving device.
- the lens may be driven along a direction orthogonal to the optical axis.
- the driving device of the present disclosure can also be applied to, for example, a driving device that drives a diaphragm (see JP 2008-259381 A).
- the drive device, the lens module, and the imaging device of the present disclosure can be applied to various electronic devices other than the mobile phone described in the above-described embodiments and the like.
- this technique can also take the following structures.
- (1) Comprising one or more polymer actuator elements configured using an ion exchange resin;
- the ion exchange resin contains operating ions having activation energy equal to or lower than a predetermined threshold value.
- the polymer actuator element is: A pair of electrode films; A polymer film inserted between the pair of electrode films,
- the drive device according to (1) wherein the ion exchange resin is used in at least one of the pair of electrode films and the polymer film.
- the driving apparatus according to (2) wherein the ion exchange resin is used for each of the pair of electrode films and the polymer film.
- (4) The drive energy according to (3), wherein the activation energy of the operating ions in the polymer film is lower than the activation energy of the operating ions in the electrode film.
- the drive device according to any one of (1) to (9), wherein the activation energy is activation energy in a predetermined low humidity environment.
- the low-humidity environment is an environment where relative humidity is 30%.
- an ion exchange equivalent mass (EW value) of the ion exchange resin is 800 [g / eq] or less.
- the drive device configured as a lens drive device that drives a lens.
- a lens, A driving device for driving the lens, The drive device has one or more polymer actuator elements configured using an ion exchange resin, The ion exchange resin contains operating ions having activation energy equal to or lower than a predetermined threshold value.
- a driving device for driving the lens, The drive device has one or more polymer actuator elements configured using an ion exchange resin, The said ion exchange resin contains the working ion which has the activation energy below a predetermined threshold value.
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Abstract
Description
1.実施の形態(ポリマーアクチュエータ素子を用いた駆動装置の一例)
2.変形例
[撮像装置を備えた電子機器の概略構成]
図1および図2は、本開示の一実施の形態に係る撮像装置(後述する撮像装置2)を備えた電子機器の一例として、撮像機能付き携帯電話機(携帯電話機8)の概略構成を斜視図で表したものである。この携帯電話機8では、2つの筐体81A,81B同士が、図示しないヒンジ機構を介して折り畳み自在に連結されている。
図3は、撮像装置2の要部構成を斜視図で表したものであり、図4は、この撮像装置2におけるレンズモジュール4の構成を分解斜視図で表したものである。また、図5は、このレンズモジュール4の概略構成を、(A)側面図(Z-X側面図)および(B)平面図(X-Y平面図)で模式的に表したものである。
次に、図6および図7を参照して、ポリマーアクチュエータ素子131,132の詳細構成について説明する。図6は、ポリマーアクチュエータ素子131,132の断面構成(Z-X断面構成)を表したものである。
ここで、本実施の形態のポリマーアクチュエータ素子131,132は、所定の閾値以下の活性化エネルギーを有するイオン(動作イオン)を含有したイオン交換樹脂を用いて構成されている。具体的には、上記した電極膜52A,52Bおよび高分子化合物膜51のうちの少なくとも一層、望ましくは、電極膜52A,52Bおよび高分子化合物膜51の各層(全ての層)に、そのような動作イオンを含有するイオン交換樹脂が用いられている。詳細には、ポリマーアクチュエータ素子131,132が、(導電性材料とイオン交換樹脂との混合層からなる電極膜52A)/(イオン交換樹脂を含む高分子化合物膜51)/(導電性材料とイオン交換樹脂との混合層からなる電極膜52B)の3層構造である場合において、これらの3層のうちの少なくとも1層、望ましくは3層全てに、そのような動作イオンを含有するイオン交換樹脂が用いられている。
続いて、本実施の形態の撮像装置2の作用および効果について説明する。
最初に、図9を参照して、ポリマーアクチュエータ素子131,132の動作について説明する。図9は、これらのポリマーアクチュエータ素子131,132の動作を、断面図を用いて模式的に表したものである。なお、ここでは、陽イオン物質として、陽イオンと極性溶媒とを含むものを用いた場合を例に挙げて説明する。
続いて、図10を参照して撮像装置2(レンズモジュール4)全体の動作について説明する。図10は、撮像装置2におけるレンズモジュール4の動作を側面図(Z-X側面図)で表したものであり、(A)は動作前の状態を、(B)は動作後の状態をそれぞれ示す。
ところで、上記したように、イオン導電性樹脂(イオン交換樹脂)中のイオンの移動現象を利用して動作を行うポリマーアクチュエータ素子では、一般に、周囲の環境によってはその特性が低下してしまうおそれがある。
ここで、このようなポリマーアクチュエータ素子131,132に関する具体的な実施例(実施例1,2)について、比較例(比較例1,2)と比較しつつ説明する。
以上、実施の形態および実施例を挙げて本開示の技術を説明したが、本技術はこれらの実施の形態等に限定されず、種々の変形が可能である。
(1)
イオン交換樹脂を用いて構成された1または複数のポリマーアクチュエータ素子を備え、
前記イオン交換樹脂は、所定の閾値以下の活性化エネルギーを有する動作イオンを含有する
駆動装置。
(2)
前記ポリマーアクチュエータ素子は、
一対の電極膜と、
前記一対の電極膜の間に挿設された高分子膜と
を有し、
前記一対の電極膜および前記高分子膜のうちの少なくとも一層に、前記イオン交換樹脂が用いられている
上記(1)に記載の駆動装置。
(3)
前記一対の電極膜および前記高分子膜の各層に、前記イオン交換樹脂が用いられている
上記(2)に記載の駆動装置。
(4)
前記高分子膜における前記動作イオンの活性化エネルギーが、前記電極膜における前記動作イオンの活性化エネルギーよりも低くなっている
上記(3)に記載の駆動装置。
(5)
前記イオン交換樹脂が、前記高分子膜において選択的に用いられている
上記(3)に記載の駆動装置。
(6)
前記動作イオンの活性化エネルギーが、0.25[eV]以下である
上記(1)ないし(5)のいずれかに記載の駆動装置。
(7)
前記動作イオンの活性化エネルギーが、0.20[eV]以下である
上記(6)に記載の駆動装置。
(8)
前記動作イオンの活性化エネルギーが、0.10[eV]以下である
上記(7)に記載の駆動装置。
(9)
前記動作イオンが、水素イオン(H+)またはリチウムイオン(Li+)である
上記(1)ないし(5)のいずれかに記載の駆動装置。
(10)
前記活性化エネルギーが、所定の低湿度環境下における活性化エネルギーである
上記(1)ないし(9)のいずれかに記載の駆動装置。
(11)
前記低湿度環境が、相対湿度=30%の環境である
上記(10)に記載の駆動装置。
(12)
前記イオン交換樹脂におけるイオン交換当量質量(EW値)が、800[g/eq]以下である
上記(1)ないし(11)のいずれかに記載の駆動装置。
(13)
レンズを駆動するレンズ駆動装置として構成されている
上記(1)ないし(12)のいずれかに記載の駆動装置。
(14)
レンズと、
前記レンズを駆動する駆動装置と
を備え、
前記駆動装置は、イオン交換樹脂を用いて構成された1または複数のポリマーアクチュエータ素子を有し、
前記イオン交換樹脂は、所定の閾値以下の活性化エネルギーを有する動作イオンを含有する
レンズモジュール。
(15)
レンズと、
前記レンズにより結像されてなる撮像信号を取得する撮像素子と、
前記レンズを駆動する駆動装置と
を備え、
前記駆動装置は、イオン交換樹脂を用いて構成された1または複数のポリマーアクチュエータ素子を有し、
前記イオン交換樹脂は、所定の閾値以下の活性化エネルギーを有する動作イオンを含有する
撮像装置。
Claims (13)
- イオン交換樹脂を用いて構成された1または複数のポリマーアクチュエータ素子を備え、
前記イオン交換樹脂は、所定の閾値以下の活性化エネルギーを有する動作イオンを含有する
駆動装置。 - 前記ポリマーアクチュエータ素子は、
一対の電極膜と、
前記一対の電極膜の間に挿設された高分子膜と
を有し、
前記一対の電極膜および前記高分子膜のうちの少なくとも一層に、前記イオン交換樹脂が用いられている
請求項1に記載の駆動装置。 - 前記一対の電極膜および前記高分子膜の各層に、前記イオン交換樹脂が用いられている
請求項2に記載の駆動装置。 - 前記動作イオンの活性化エネルギーが、0.25[eV]以下である
請求項1に記載の駆動装置。 - 前記動作イオンの活性化エネルギーが、0.20[eV]以下である
請求項4に記載の駆動装置。 - 前記動作イオンの活性化エネルギーが、0.10[eV]以下である
請求項5に記載の駆動装置。 - 前記動作イオンが、水素イオン(H+)またはリチウムイオン(Li+)である
請求項1に記載の駆動装置。 - 前記活性化エネルギーが、所定の低湿度環境下における活性化エネルギーである
請求項1に記載の駆動装置。 - 前記低湿度環境が、相対湿度=30%の環境である
請求項8に記載の駆動装置。 - 前記イオン交換樹脂におけるイオン交換当量質量(EW値)が、800[g/eq]以下である
請求項1に記載の駆動装置。 - レンズを駆動するレンズ駆動装置として構成されている
請求項1に記載の駆動装置。 - レンズと、
前記レンズを駆動する駆動装置と
を備え、
前記駆動装置は、イオン交換樹脂を用いて構成された1または複数のポリマーアクチュエータ素子を有し、
前記イオン交換樹脂は、所定の閾値以下の活性化エネルギーを有する動作イオンを含有する
レンズモジュール。 - レンズと、
前記レンズにより結像されてなる撮像信号を取得する撮像素子と、
前記レンズを駆動する駆動装置と
を備え、
前記駆動装置は、イオン交換樹脂を用いて構成された1または複数のポリマーアクチュエータ素子を有し、
前記イオン交換樹脂は、所定の閾値以下の活性化エネルギーを有する動作イオンを含有する
撮像装置。
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JP6152622B2 (ja) | 2017-06-28 |
TW201322614A (zh) | 2013-06-01 |
US9590169B2 (en) | 2017-03-07 |
TWI596884B (zh) | 2017-08-21 |
CN103718078B (zh) | 2018-05-15 |
JP2013037315A (ja) | 2013-02-21 |
US20140168504A1 (en) | 2014-06-19 |
KR101956404B1 (ko) | 2019-03-08 |
CN103718078A (zh) | 2014-04-09 |
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