JP2000081504A - Variable-focal lens - Google Patents

Variable-focal lens

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Publication number
JP2000081504A
JP2000081504A JP25162698A JP25162698A JP2000081504A JP 2000081504 A JP2000081504 A JP 2000081504A JP 25162698 A JP25162698 A JP 25162698A JP 25162698 A JP25162698 A JP 25162698A JP 2000081504 A JP2000081504 A JP 2000081504A
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Prior art keywords
lens
variable focus
unit
actuator
lens unit
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JP25162698A
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Japanese (ja)
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JP4144079B2 (en )
Inventor
Taku Kaneko
Nobuaki Kawahara
伸章 川原
金子  卓
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Denso Corp
株式会社デンソー
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B3/00Simple or compound lenses
    • G02B3/12Fluid-filled or evacuated lenses
    • G02B3/14Fluid-filled or evacuated lenses of variable focal length

Abstract

PROBLEM TO BE SOLVED: To provided a simply-structured, small and inexpensive variable-focal lens. SOLUTION: This variable-focal lens is composed of a lens part 10 where a focal length varies due to the variation in a shape by external force, and a ring and flat plate-shaped actuator part 20 which is located along one side of the lens part 10 and applies external force to the lens part to deform the shape. Thus, it is possible to provide the variable-focal lens small in the direction of the thickness, simple in the structure and inexpensive in the cost.

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】本発明は、レンズの焦点距離を可変制御できる可変焦点レンズに関するもので、当該可変焦点レンズは、顕微鏡、顕微鏡カメラ装置、その他医療用、工業用のカテーテル、プルーブの先端に装備される光学レンズ等、広い分野に応用されるものである。 BACKGROUND OF THE INVENTION The present invention is a focal length of the lens as it relates to a variable focus lens capable of varying control, the variable focus lens, a microscope, a microscope camera device, other medical, industrial catheter, the tip of the probe optical lenses or the like to be mounted on, is intended to be applied in various fields.

【0002】 [0002]

【従来の技術】従来、微小な物体を観察するために、光学式顕微鏡や、拡大光学機構を備えた顕微鏡カメラが多く使用されている。 Conventionally, in order to observe the microscopic object, or an optical microscope, magnified microscope camera with an optical system it is often used. これらの光学式顕微鏡や顕微鏡カメラは、倍率が大きくなるほど被写体深度が浅くなるため、近年研究が盛んになってきているマイクロマシンにおける微小で、かつ、立体的な部品の組立や観察は困難である。 These optical microscope or a microscope camera, since the magnification is higher depth of field becomes shallow large, small in micromachine recent years research has become popular, and assembling and viewing of three-dimensional parts is difficult. 特開平9−230252号公報には、これに対処すべきカメラ装置が提案されている。 JP-A-9-230252, the camera apparatus has been proposed to be addressed to it.

【0003】当該カメラ装置は、対物レンズの物体側の焦点面の高速振動により生ずる残像現象を利用して被写体深度を大幅に拡大すべく機能するもので、この対物レンズは、外力により変形するレンズ部と、その回りに配置された複数のアクチュエータ部とからなる可変焦点レンズとして構成されている。 [0003] The camera device is intended to function so as to significantly expand the depth of field by utilizing the afterimage phenomenon caused by high-speed oscillation of the focal plane on the object side of the objective lens, the objective lens, the lens being deformed by an external force and parts, are configured as a variable focus lens comprising a plurality of actuators disposed therearound.

【0004】 [0004]

【発明が解決しようとする課題】ところで、上記した可変焦点レンズにおいては、アクチュエータ部の構成が複雑であり、また、レンズ部に付与する外力を大きくするため、レンズ部に対してアクチュエータ部を複数配設する手段が採られている。 [SUMMARY OF THE INVENTION Incidentally, in the variable focus lens described above, the configuration of the actuator unit is complicated, also, in order to increase the external force applied to the lens unit, a plurality of actuators with respect to the lens unit means arranged is adopted. このため、アクチュエータ部自体を小型化することが困難であるとともに、可変焦点レンズを小型化することが困難である。 Therefore, the actuator portion itself is difficult to miniaturize, it is difficult to reduce the size of the variable focus lens. また、可変焦点レンズのレンズ部を構成する弾性膜に圧電素子を接合してなる単純な構造も提案されているが、レンズ部を高速で振動させるための大きい作用力を発生させ得ないおそれがある。 Further, there have been proposed a simple structure formed by bonding the piezoelectric element to the elastic membrane of the lens portion of the variable focus lens, a possibility which can not generate a large acting force for vibrating the lens unit at a high speed is there. さらにまた、レンズ部を構成する弾性膜としては、付与される外力に対する変形の応答性を鋭敏にすべく、極めて薄いガラスダイヤフラム等の強度の低い弾性薄膜が採用されるため、衝撃等の外力に対する破損の問題がある。 For Moreover, as the elastic layer of the lens unit, in order to acuity response of deformation against an external force applied, since the low elastic film strength of such an extremely thin glass diaphragm is employed, an external force such as an impact there is a corruption problem. 従って、本発明の目的は、これらの問題に対処することにある。 Accordingly, an object of the present invention to address these problems.

【0005】 [0005]

【課題を解決するための手段】本発明に係る可変焦点レンズにおいては、外力による形状変化により焦点距離が変化するレンズ部と、該レンズ部の一面側に沿って位置して該レンズ部に形状変化させるための外力を付与するリング状で平板状のアクチュエータ部を備えた構成としており、可変焦点レンズの厚みを大幅に縮小している。 In the variable focus lens according to the present invention, in order to solve the problems], and a lens unit for changing the focal length by the shape change due to an external force, the shape in the lens unit located along the one side of the lens unit and a structure having a plate-shaped actuator part a ring-shaped for applying an external force to change, has greatly reduced the thickness of the variable focus lens.

【0006】また、本発明に係る可変焦点レンズにおいては、前記アクチュエータ部における内孔を前記レンズ部に対する光路として能動光学デバイスを構成しており、能動光学デバイスの光路を容易に確保して簡単で、 [0006] In the variable focus lens according to the present invention, it constitutes an active optical device an inner hole in the actuator unit as an optical path for said lens unit, a simple and easily secured optical path of the active optical device ,
かつ、小型化している。 And, it has been reduced in size.

【0007】 [0007]

【発明の作用・効果】このように、本発明に係る可変焦点レンズによれば、その厚みを大幅に縮小して小型化を図るとともに、レンズ部に対する光路を容易に確保し得て構造簡単で小型化を図ることができるが、アクチュエータ部をレンズ部の表裏両面側にそれぞれ配置するように構成すれば、レンズ部の曲率半径の変化を増大することができて、焦点距離の可変できる範囲を拡大することができる。 [Operation and Effect of the Invention Thus, according to the variable focus lens according to the present invention, together with miniaturized greatly reduce its thickness, structure is simple and obtained easily ensure the optical path to the lens unit Although it is possible to reduce the size, if configured to arranged the actuator portion on both sides side of the lens unit, and it is possible to increase the change in the radius of curvature of the lens unit, a variable range of the focal length it can be expanded to.

【0008】本発明に係る可変焦点レンズにおいて、前記アクチュエータ部を、リング状の弾性板と、電極を有するリング状の圧電薄板からなる圧電ユニモルフまたは圧電バイモルフとすれば、アクチュエータ部の制御に対する応答性を高めることができる。 [0008] In the variable focus lens according to the present invention, the actuator unit, if a ring-shaped elastic plate, a piezoelectric unimorph or piezoelectric bimorph comprising a ring-shaped piezoelectric thin plate with electrodes, responsive to control of the actuator unit it can be increased. この場合、レンズ部とその表裏両面側に位置する各アクチュエータ部とを、 In this case, with each actuator portion located between its front and back surfaces side lens unit,
筒状の外側連結部材により外周部にて一体的に連結する構成を採れば、各アクチュエータ部で発生する作動力をレンズ部へ効率よく伝達することができるとともに、構成上部品点数を削減することができ、かつ、部品点数の削減に起因してプロセスの簡便化を図ることができる。 Taking the arrangement of integrally connected at the outer peripheral portion by a cylindrical outer coupling member, it is possible to efficiently transmit to the lens unit of the actuating force generated by each actuator unit, reducing the structure upper part number it can be, and it is possible to simplify the process due to a reduction in the number of components.

【0009】また、本発明に係る可変焦点レンズにおいては、前記レンズ部を、2枚の透明なダイヤフラムと、 [0009] In the variable focus lens according to the present invention, the lens unit, and the two transparent diaphragm,
これら各ダイヤフラムが表裏各面側に接合されてこれら各ダイヤフラムグとともに空間部を形成するリングと、 A ring forming a space together with the respective diaphragms grayed respective diaphragms is joined to the front and back surfaces side,
該空間部に封入された透明な動作流体とにより構成することができる。 It can be constituted by a transparent operation fluid sealed in the space portion. この場合、各アクチュエータ部をレンズ部の各ダイヤフラムの表面に密接させるように構成すれば、各アクチュエータ部で発生する作動力をレンズ部へ効率よく伝達することができ、かつ、各アクチュエータ部がレンズ部を保護して外部からの衝撃等に対する強度を高めることができる。 In this case, if configured to close each actuator unit on the surface of each diaphragm of the lens portion, the actuating force generated by the actuator to the lens unit can be efficiently transmitted, and each of the actuator elements is a lens it is possible to enhance the strength against external impact or the like to protect the parts.

【0010】 [0010]

【実施例】以下、本発明を図面に基づいて説明すると、 EXAMPLES The following will be described the present invention based on the drawings,
図1および図2には、本発明の一例に係る可変焦点レンズを使用した能動光学デバイスが示されている。 1 and 2 are active optical device using a variable focus lens according to an example of the present invention is shown. 当該能動光学デバイスは、レンズ部10と、一対のアクチュエータ部20とにより構成されている。 The active optical device includes a lens unit 10, and a pair of actuator portions 20.

【0011】レンズ部10は、図3(模式図)に示すように、ガラス製の円形リング11、円形リング11の表裏各面に接合されたガラス製のダイヤフラム12,1 [0011] lens unit 10, as shown in FIG. 3 (schematic view), a glass circular ring 11, a glass diaphragm which is joined to the front and back surfaces of the circular ring 11 12,1
3、およびシリコーンオイル等の透明な動作流体14からなるもので、動作流体14は、円形リング11と両ダイヤフラム12,13にて形成されている空間部に封入されている。 3, and made of a transparent working fluid 14 of the silicone oil, the working fluid 14 is enclosed in a space portion formed in a circular ring 11 and the two diaphragms 12, 13.

【0012】本実施例においては、円形リング11は外径15mm、内径13mm、厚み2mmのほう珪酸ガラスからなるリングで、内外に貫通する2個の貫通穴を備えている。 [0012] In this embodiment, the circular ring 11 outer diameter 15 mm, inner diameter 13 mm, made of silicate glass towards the thickness 2mm ring is provided with two through holes that penetrate in and out. 一方の貫通穴は、動作流体を空間部に注入する注入穴として使用され、かつ、他方の貫通穴は、動作流体を空間部に注入する際の空間部内の空気を排出する排出穴として使用されるもので、両貫通穴は動作流体の空間部への注入後密閉される。 One through hole is used as an injection hole for injecting a working fluid into the space, and the other through hole is used as a discharge hole for discharging the air in the space portion at the time of injecting the working fluid into the space in shall, both through holes is sealed after injection into the space of the working fluid. また、各ダイヤフラム1 In addition, each of the diaphragm 1
2,13は、直径15mm、厚み50μmの珪酸ガラスからなる弾性膜である。 2,13 is an elastic film composed of diameter 15 mm, thickness 50μm silicate glass. なお、各ダイヤフラム12,1 In addition, each diaphragm 12, 1
3の一方または両方を、中央部に透明窓を有するステンレス等の弾性膜にて形成することもできる。 One or both of the 3, may be formed of an elastic film such as stainless steel having a transparent window in the center.

【0013】アクチュエータ部20はリング状の圧電バイモルフであり、図4に示すように、リング状の弾性金属板21と、弾性金属板21の表裏両面に接合されたリング状で平板状の一対の圧電素子22,23からなるもので、各圧電素子22,23はペロブスカイト型構造のジルコン酸鉛とチタン酸鉛の固溶体Pb(Zr,Ti) [0013] The actuator portion 20 is a ring-shaped piezoelectric bimorph, as shown in FIG. 4, a ring-shaped elastic metal plate 21, a pair of plate-shaped ring-like bonded to both surfaces of the elastic metal plate 21 made of piezoelectric elements 22 and 23, the piezoelectric elements 22 and 23 are solid solutions Pb of lead zirconate and lead titanate perovskite structure (Zr, Ti)
3にて形成されている。 It is formed by O 3. 各圧電素子22,23は、表裏両面に銀電極が印刷されていて、導電性接着剤を介して弾性金属板21にそれぞれ接合されている。 Each piezoelectric element 22, 23 has a silver electrode is printed on both sides, it is joined respectively to the elastic metal plate 21 via a conductive adhesive.

【0014】アクチュエータ部20において、両圧電素子22,23は弾性金属板21を介して積層状態にあるが、積層方向に対して同一の分極方向になるように積層されている。 [0014] In the actuator unit 20, two piezoelectric elements 22 and 23 are in a laminated state through an elastic metal plate 21 are laminated to have the same polarization direction with respect to the stacking direction. このため、両圧電素子22,23は、電圧印加時、両圧電素子22,23には逆向きの電圧が印加されて、両圧電素子22,23の一方が径方向に収縮するとともに他方が径方向に膨張して変形する。 Therefore, both the piezoelectric element 22 and 23, when a voltage is applied, the voltage of the opposite direction is applied to both piezoelectric elements 22 and 23, the other diameter with one of the two piezoelectric elements 22 and 23 contracts in the radial direction It deforms in expansion in direction.

【0015】各アクチュエータ部20は、レンズ部10 [0015] Each actuator unit 20 includes a lens portion 10
の表裏各面側にそれぞれ配置されていて、レンズ部10 It is arranged in the front and back surfaces side respectively, the lens unit 10
を挟持した状態で、パイプ状の外側連結部材24にて互いに連結されており、各アクチュエータ部20の内周縁に設けたリング状の内側連結部材25がレンズ部10を構成する各ダイヤフラム12,13当接して接合している。 While holding the respective diaphragms 12, 13 are connected to each other by a pipe-like outer coupling member 24, the inner coupling member 25 the ring-shaped provided on the inner periphery of each actuator unit 20 constituting the lens unit 10 It is bonded contact with. これにより、各アクチュエータ部20に設けた内側連結部材25は、レンズ部10に対する光路を形成している。 Thus, the inner connecting member 25 provided to each actuator unit 20 forms an optical path for the lens unit 10.

【0016】図2は、当該能動光学デバイスの動作状態を模式的に示すもので、各アクチュエータ部20に対する電圧印加により、各アクチュエータ部20は印加される電圧の大小に応じて変形し、レンズ部10を構成する各ダイヤフラム12,13を押圧および引張して、動作流体14を加減圧する。 [0016] Figure 2, the operation state of the active optical device shows schematically, by applying voltage to each actuator unit 20, each actuator unit 20 is deformed according to the magnitude of the voltage applied, the lens unit each diaphragm 12 and 13 which constitute the 10 pressing and tensile to, the working fluid 14 to decrease pressure. これにより、各ダイヤフラム1 Thus, the diaphragm 1
2,13の曲率が同図の(a),(b),(c)のごとく変化して、レンズ部10における曲率半径を変化させて、レンズの焦点距離を可変とする。 Curvature of 2, 13 of FIG. (A), changes as the (b), (c), by changing the radius of curvature at the lens unit 10, the focal length of the lens is variable.

【0017】このように、当該能動光学デバイスにおいては、レンズ部10の表裏両面側に配置した両アクチュエータ部20によりレンズ部10の両ダイヤフラム1 [0017] Thus, both diaphragms 1 of the in active optical devices, a lens unit 10 by both the actuator portion 20 disposed on the front and back both sides of the lens portion 10
2,13の曲率を変化させるものであるから、アクチュエータ部20をレンズ部10の片側に配置する場合に比較して焦点距離の最大変化量を倍にすることができて、 Because one which changes a curvature of 2,13, and can double the maximum amount of change in focal length as compared with the case of arranging the actuator unit 20 on one side of the lens unit 10,
焦点距離の可変範囲を拡大することができる。 It is possible to expand the variable range of the focal length. また、ダイヤフラム12,13に膜圧分布を形成することにより、ダイヤフラム12,13の変形形状を制御することが可能であり、当該能動光学デバイスの光学特性を向上させることができる。 Further, by forming a film pressure distribution on the diaphragm 12, it is possible to control the deformed shape of the diaphragm 12, it is possible to improve the optical characteristics of the active optical device.

【0018】ところで、当該能動光学デバイスにおいては、外力による形状変化により焦点距離が変化するレンズ部10と、レンズ部10の一面側に沿って位置してレンズ部10に形状変化させるための外力を付与するリング状で平板状のアクチュエータ部20を備えた構成としているため、能動光学デバイス全体の厚みを大幅に縮小することができ、また、アクチュエータ部20における内孔をレンズ部10に対する光路として使用するため、 By the way, in the active optical device, the lens unit 10 whose focal length changes with the shape change due to an external force, the lens unit 10 is positioned along one side of the lens unit 10 to an external force for causing shape change because it is configured to include a plate-like actuator 20 in imparting to the ring-shaped, the thickness of the entire active optical device can be greatly reduced, also using an inner hole in the actuator unit 20 as an optical path for the lens unit 10 In order to,
能動光学デバイスの光路を容易に確保し得て、能動光学デバイス簡単な構成で小型化することができる。 And obtained easily ensured the optical path of the active optical device, it is possible to reduce the size of an active optical device simple configuration.

【0019】また、当該能動光学デバイスにおいて、アクチュエータ部20を、リング状の弾性金属板21と、 Further, in the active optical device, an actuator unit 20, a ring-shaped elastic metal plate 21,
電極を有するリング状の圧電素子22,23からなる圧電バイモルフに構成しているため、アクチュエータ部2 Due to the structure of the piezoelectric bimorph comprising a ring-shaped piezoelectric elements 22 and 23 having electrodes, the actuator unit 2
0の制御に対する応答性を高めることができる。 It is possible to enhance the responsiveness to control is zero. この場合、レンズ部10とその表裏両面側に位置する各アクチュエータ部20を、パイプ状の外側連結部材24により外周部にて一体的に連結しているため、各アクチュエータ部20で発生する作動力(変形により発生)をレンズ部10へ効率よく伝達することができるとともに、構成上部品点数を削減することができ、かつ、部品点数の削減に起因してプロセスの簡便化を図ることができる。 Actuating force In this case, each actuator unit 20 is located between the lens unit 10 on its front and back both sides, since the integrally connected at the outer peripheral portion by the outer coupling member 24 pipe-shaped, occurring in each of the actuator elements 20 it is possible to efficiently transmit to the lens unit 10 (generated by deformation), it is possible to reduce the construction upper part number, and it is possible to simplify the process due to a reduction in the number of components.

【0020】また、当該能動光学デバイスにおいては、 Further, in the active optical device,
レンズ部10を、2枚の透明なダイヤフラム12,13 The lens portion 10, two transparent diaphragm 12
と、各ダイヤフラム12,13が表裏各面側に接合されてこれら各ダイヤフラムグ112,13とともに空間部を形成するリング11と、該空間部に封入された透明な動作流体14とにより構成して、各アクチュエータ部2 When a ring 11 which each diaphragm 12 and 13 to form a space together with the respective diaphragms grayed 112,13 joined to the front and back surfaces side, constituted by a transparent working fluid 14 sealed in the space portion , each of the actuator elements 2
0をレンズ部10の各ダイヤフラム12,13の表面に密接させているため、各アクチュエータ部20で発生する作動力をレンズ部10へ効率よく伝達することができ、かつ、各アクチュエータ部20がレンズ部10を保護して外部からの衝撃等に対する強度を高めることができる。 0 since the in close contact to the surface of the respective diaphragms 12, 13 of the lens unit 10, the actuating force generated by the actuator unit 20 to the lens unit 10 can be efficiently transmitted, and each of the actuator elements 20 is the lens it is possible to enhance the strength against external impact or the like to protect the parts 10.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の一例に係る可変焦点レンズを使用した能動光学デバイスを縦断した斜視図である。 1 is a perspective view of the active optical device using the vertical variable focus lens according to an example of the present invention.

【図2】同能動光学デバイスの動作説明図(a), [2] Operation view of the active optical device (a),
(b),(c)である。 (B), it is (c).

【図3】同能動光学デバイスを構成するレンズ部を縦断し分解した斜視図である。 3 is a perspective view of the longitudinal decompose lens portions constituting the same active optical device.

【図4】同能動光学デバイスを構成するアクチュエータ部を縦断した斜視図である。 4 is a perspective view of vertical actuator portion constituting the active optical device.

【符号の説明】 DESCRIPTION OF SYMBOLS

10…レンズ部、11…円形リング、12,13…ダイヤフラム、14…動作流体、20…アクチュエータ部、 10 ... lens portion, 11 ... circular ring, 12 and 13 ... diaphragm, 14 ... operation fluid, 20 ... actuator,
21…弾性金属板、22,23…圧電素子、24…外側連結部材、25…内側連結部材。 21 ... elastic metal plate, 22, 23 ... piezoelectric element, 24 ... outer coupling member, 25 ... inner coupling member.

Claims (7)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 外力による形状変化により焦点距離が変化するレンズ部と、該レンズ部の一面側に沿って位置して該レンズ部に形状変化させるための外力を付与するリング状で平板状のアクチュエータ部を備えていることを特徴とする可変焦点レンズ。 And 1. A lens unit focal length the shape change due to an external force changes, plate-shaped ring-shaped for applying an external force for causing the change in shape to the lens portion is positioned along one side of the lens unit variable focus lens, characterized in that an actuator unit.
  2. 【請求項2】 前記アクチュエータ部は、前記レンズ部の表裏両面側にそれぞれ配置されている請求項1に記載の可変焦点レンズ。 Wherein said actuator unit includes a variable focus lens according to claim 1 which are respectively arranged on both sides side of the lens unit.
  3. 【請求項3】 前記アクチュエータ部における内孔が前記レンズ部に対する光路に形成されて能動光学デバイスを構成している請求項1または2に記載の可変焦点レンズ。 3. A variable focus lens according to claim 1 or 2 is formed on the optical path constitute an active optical device for inner hole in the actuator unit is the lens unit.
  4. 【請求項4】 前記アクチュエータ部は、リング状の弾性板と、電極を有するリング状の圧電薄板からなる圧電ユニモルフまたは圧電バイモルフである請求項1,2または3に記載の可変焦点レンズ。 Wherein said actuator unit includes a ring-shaped elastic plate and a variable focus lens according to claim 1, 2 or 3 is a piezoelectric unimorph or piezoelectric bimorph comprising a ring-shaped piezoelectric thin plate with electrodes.
  5. 【請求項5】 前記レンズ部は、2枚の透明なダイヤフラムと、これら各ダイヤフラムが表裏各面側に接合されてこれら各ダイヤフラムグとともに空間部を形成するリングと、該空間部に封入された透明な動作流体とにより構成されている請求項1,2または3に記載の可変焦点レンズ。 Wherein said lens unit includes two transparent diaphragm, and a ring to form a space together with the respective diaphragms grayed respective diaphragms is joined to the front and back surfaces side, is sealed in the space portion variable focus lens according to claim 1, 2 or 3 is constituted by a transparent working fluid.
  6. 【請求項6】 前記レンズ部と、該レンズ部の表裏両面側に位置する各アクチュエータ部とが、筒状の外側連結部材により外周部にて一体的に連結されている請求項2 Wherein said lens part and, each actuator portion positioned on both sides side of the lens unit, according to claim which is integrally connected at the outer peripheral portion by a cylindrical outer coupling member 2
    に記載の可変焦点レンズ。 Variable focus lens according to.
  7. 【請求項7】 前記各アクチュエータ部が前記レンズ部を構成する各ダイヤフラムの表面に密接している請求項2または6に記載の可変焦点レンズ。 Wherein said variable focus lens according to claim 2 or 6 is in close contact with the surface of each diaphragm and each actuator unit constituting the lens unit.
JP25162698A 1998-09-04 1998-09-04 Variable focus lens Expired - Fee Related JP4144079B2 (en)

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