JP2000081504A - Variable-focal lens - Google Patents
Variable-focal lensInfo
- Publication number
- JP2000081504A JP2000081504A JP10251626A JP25162698A JP2000081504A JP 2000081504 A JP2000081504 A JP 2000081504A JP 10251626 A JP10251626 A JP 10251626A JP 25162698 A JP25162698 A JP 25162698A JP 2000081504 A JP2000081504 A JP 2000081504A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- section
- actuator
- ring
- diaphragms
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/12—Fluid-filled or evacuated lenses
- G02B3/14—Fluid-filled or evacuated lenses of variable focal length
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
Description
【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 1. Field of the Invention The present invention relates to a varifocal lens capable of variably controlling the focal length of a lens. The varifocal lens includes a microscope, a microscope camera device, other medical and industrial catheters, and a probe tip. It is applied to a wide range of fields, such as an optical lens installed in a camera.
【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。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。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。2. Description of the Related Art Conventionally, in order to observe a minute object, an optical microscope and a microscope camera provided with a magnifying optical mechanism are often used. In these optical microscopes and microscope cameras, as the magnification increases, the depth of the subject becomes shallower, so that it is difficult to assemble and observe minute and three-dimensional parts in a micromachine that has been actively studied in recent years. Japanese Patent Application Laid-Open No. 9-230252 proposes a camera device that should deal with this.
【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。The camera apparatus functions to greatly increase the depth of a subject by using an afterimage phenomenon caused by a high-speed vibration of a focal plane on the object side of an objective lens. This objective lens is a lens that is deformed by an external force. It is configured as a varifocal lens comprising a unit and a plurality of actuator units arranged around the unit.
【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。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。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。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。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。In the variable focus lens described above, the structure of the actuator section is complicated, and in order to increase the external force applied to the lens section, a plurality of actuator sections are provided with respect to the lens section. Means of arrangement are taken. For this reason, it is difficult to reduce the size of the actuator unit itself, and it is also difficult to reduce the size of the varifocal lens. Further, a simple structure in which a piezoelectric element is bonded to an elastic film constituting a lens portion of a variable focus lens has been proposed, but a large acting force for vibrating the lens portion at high speed may not be generated. is there. Furthermore, as the elastic film constituting the lens portion, an elastic thin film having a low strength such as an extremely thin glass diaphragm is employed in order to sharpen the response of the deformation to the applied external force, so that the elastic film against the external force such as an impact is applied. There is a corruption problem. Accordingly, it is an object of the present invention to address these issues.
【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。SUMMARY OF THE INVENTION In a variable focus lens according to the present invention, a lens portion whose focal length changes due to a shape change due to an external force, and a lens portion which is located along one surface side of the lens portion and has a shape. It is provided with a ring-shaped and plate-shaped actuator section for applying an external force for changing, and the thickness of the varifocal lens is greatly reduced.
【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、
かつ、小型化している。In the varifocal lens according to the present invention, an active optical device is formed by using an inner hole in the actuator section as an optical path to the lens section. ,
And it is downsized.
【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。As described above, according to the varifocal lens according to the present invention, the thickness can be greatly reduced to reduce the size, and the optical path to the lens can be easily secured, so that the structure is simple. Although it is possible to reduce the size, if the actuator section is arranged on each of the front and back surfaces of the lens section, the change in the radius of curvature of the lens section can be increased, and the range in which the focal length can be varied is increased. Can be expanded.
【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。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、
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。In the variable focus lens according to the present invention, if the actuator section is a piezoelectric unimorph or a piezoelectric bimorph composed of a ring-shaped elastic plate and a ring-shaped piezoelectric thin plate having electrodes, the response to the control of the actuator section is improved. Can be increased. In this case, the lens section and each actuator section located on both front and back sides thereof are
By adopting a configuration in which the outer peripheral portion is integrally connected by a cylindrical outer connecting member, the operating force generated in each actuator portion can be efficiently transmitted to the lens portion, and the number of components in the configuration can be reduced. And the process can be simplified due to the reduction in the number of parts.
【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、
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する
ことができる。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。Further, in the variable focus lens according to the present invention, the lens portion includes two transparent diaphragms,
A ring in which each of these diaphragms is joined to the front and back surfaces to form a space with each of the diaphragms;
It can be constituted by a transparent working fluid sealed in the space. In this case, if each actuator section is configured to be in close contact with the surface of each diaphragm of the lens section, the operating force generated by each actuator section can be efficiently transmitted to the lens section, and each actuator section can be used as a lens. By protecting the portion, the strength against an external impact or the like can be increased.
【００１０】[0010]
【実施例】以下、本発明を図面に基づいて説明すると、
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。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。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.
FIGS. 1 and 2 show an active optical device using a variable focus lens according to an example of the present invention. The active optical device includes a lens unit 10 and a pair of actuator units 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
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。As shown in FIG. 3 (schematic diagram), the lens portion 10 includes a glass circular ring 11 and glass diaphragms 12, 1 joined to the front and back surfaces of the circular ring 11.
3 and a transparent working fluid 14 such as silicone oil. The working fluid 14 is sealed in a space formed by the circular ring 11 and the two diaphragms 12 and 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。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。また、各ダイヤフラム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。なお、各ダイヤフラム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。In the present embodiment, the circular ring 11 is a ring made of borosilicate glass having an outer diameter of 15 mm, an inner diameter of 13 mm, and a thickness of 2 mm, and has two through holes penetrating inside and outside. 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 air in the space when the working fluid is injected into the space. The two through holes are sealed after the working fluid is injected into the space. In addition, each diaphragm 1
Reference numerals 2 and 13 denote elastic films made of silicate glass having a diameter of 15 mm and a thickness of 50 μm. In addition, each diaphragm 12, 1
One or both of 3 may be formed of an elastic film such as stainless steel having a transparent window at 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）
Ｏ3にて形成されている。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。The actuator section 20 is a ring-shaped piezoelectric bimorph, and as shown in FIG. 4, a ring-shaped elastic metal plate 21 and a pair of ring-shaped flat plate-like members joined to the front and back surfaces of the elastic metal plate 21. Each of the piezoelectric elements 22 and 23 is a solid solution Pb (Zr, Ti) of perovskite type lead zirconate and lead titanate.
It is formed of O 3 . Each of the piezoelectric elements 22 and 23 has silver electrodes printed on both front and back surfaces, and is joined 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。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。In the actuator section 20, the two piezoelectric elements 22, 23 are in a laminated state via the elastic metal plate 21, but are laminated so as to have the same polarization direction with respect to the laminating direction. For this reason, when a voltage is applied to the two piezoelectric elements 22 and 23, a reverse voltage is applied to the two piezoelectric elements 22 and 23, and one of the two piezoelectric elements 22 and 23 contracts in the radial direction and the other of the two piezoelectric elements 22 and 23 decreases in diameter. It expands and deforms in the direction.
【００１５】各アクチュエータ部２０は、レンズ部１０
の表裏各面側にそれぞれ配置されていて、レンズ部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。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。Each actuator section 20 includes a lens section 10
The lens unit 10 is disposed on each of the front and back surfaces of the lens unit 10.
Are held together by a pipe-shaped outer connecting member 24, and a ring-shaped inner connecting member 25 provided on the inner peripheral edge of each actuator unit 20 is connected to each of the diaphragms 12, 13 constituting the lens unit 10. Abutting and joining. As a result, the inner connecting members 25 provided in each actuator unit 20 form 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。これにより、各ダイヤフラム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。FIG. 2 schematically shows an operation state of the active optical device. When a voltage is applied to each actuator section 20, each actuator section 20 is deformed according to the magnitude of the applied voltage, and the lens section is deformed. The working fluid 14 is pressurized and depressurized by pressing and pulling each of the diaphragms 12 and 13 constituting the 10. Thereby, each diaphragm 1
The curvatures of the lenses 2 and 13 are changed as shown in (a), (b) and (c) of FIG. 1 to change the radius of curvature in the lens unit 10 to make the focal length of the lens 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
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、
焦点距離の可変範囲を拡大することができる。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。As described above, in the active optical device, the two diaphragms 1 of the lens unit 10 are controlled by the two actuator units 20 disposed on the front and back surfaces of the lens unit 10.
Since the curvatures 2 and 13 are changed, the maximum change amount of the focal length can be doubled as compared with the case where the actuator unit 20 is arranged on one side of the lens unit 10.
The variable range of the focal length can be expanded. Further, by forming the film pressure distribution on the diaphragms 12, 13, the deformed shapes of the diaphragms 12, 13 can be controlled, and the optical characteristics of the active optical device can be improved.
【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、
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。Incidentally, in the active optical device, a lens portion 10 whose focal length changes due to a shape change due to an external force, and an external force positioned along one surface side of the lens portion 10 to change the shape of the lens portion 10 are applied. Since the ring-shaped and flat actuator section 20 is provided, the thickness of the entire active optical device can be greatly reduced, and the inner hole of the actuator section 20 is used as an optical path for the lens section 10. To do
The optical path of the active optical device can be easily secured, and the size of the active optical device can be reduced with a 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、
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
０の制御に対する応答性を高めることができる。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。Further, in the active optical device, the actuator section 20 includes a ring-shaped elastic metal plate 21,
Since the piezoelectric bimorph is constituted by the ring-shaped piezoelectric elements 22 and 23 having electrodes, the actuator section 2
Responsiveness to the control of 0 can be improved. In this case, since the lens unit 10 and the actuator units 20 located on both front and rear sides thereof are integrally connected at the outer peripheral portion by a pipe-shaped outer connecting member 24, the operating force generated by each actuator unit 20 (Generated by deformation) can be efficiently transmitted to the lens unit 10, the number of parts can be reduced in the configuration, and the process can be simplified due to the reduction in the number of parts.
【００２０】また、当該能動光学デバイスにおいては、
レンズ部１０を、２枚の透明なダイヤフラム１２，１３
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
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。Further, in the active optical device,
The lens unit 10 is provided with two transparent diaphragms 12 and 13.
And a ring 11 in which the diaphragms 12 and 13 are joined to the front and back surfaces to form a space together with the diaphragms 112 and 13, and a transparent working fluid 14 sealed in the space. , Each actuator section 2
0 is in close contact with the surfaces of the diaphragms 12 and 13 of the lens unit 10, so that the operating force generated by each actuator unit 20 can be efficiently transmitted to the lens unit 10, and each actuator unit 20 The portion 10 can be protected to increase the strength against external impact and the like.
【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。FIG. 1 is a perspective view in which an active optical device using a variable focus lens according to an example of the present invention has been longitudinally cut.
【図２】同能動光学デバイスの動作説明図（ａ），
（ｂ），（ｃ）である。FIG. 2 is an explanatory view of the operation of the active optical device (a),
(B) and (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。FIG. 3 is a perspective view in which a lens unit constituting the active optical device is longitudinally cut and disassembled.
【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。FIG. 4 is a perspective view in which an actuator section constituting the active optical device is longitudinally sectioned.
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、
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。Reference numeral 10: lens portion, 11: circular ring, 12, 13: diaphragm, 14: working fluid, 20: actuator portion,
21: elastic metal plate, 22, 23: piezoelectric element, 24: outer connecting member, 25: inner connecting member.
Claims (7)
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。1. A lens portion whose focal length changes due to a shape change due to an external force, and a ring-shaped and flat plate-shaped member which is located along one surface side of the lens portion and applies an external force to the lens portion to change its shape. A variable focus lens comprising an actuator unit.
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。2. The varifocal lens according to claim 1, wherein the actuator section is disposed on each of the front and back surfaces of the lens section.
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. The varifocal lens according to claim 1, wherein an inner hole in the actuator section is formed in an optical path with respect to the lens section to form an active optical device.
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。4. The varifocal lens according to claim 1, wherein the actuator section is a piezoelectric unimorph or a piezoelectric bimorph composed of a ring-shaped elastic plate and a ring-shaped piezoelectric thin plate having electrodes.
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。5. The lens part is enclosed in the space part, and includes two transparent diaphragms, a ring in which the respective diaphragms are joined to the front and back surfaces, and forms a space together with the respective diaphragms. 4. The varifocal lens according to claim 1, wherein the varifocal lens is formed of a transparent working fluid.
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
に記載の可変焦点レンズ。6. The lens section and the actuator sections located on both front and back sides of the lens section are integrally connected at an outer peripheral portion by a cylindrical outer connecting member.
7. The variable focus lens according to item 1.
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。7. The varifocal lens according to claim 2, wherein each of the actuator units is in close contact with a surface of each of the diaphragms constituting the lens unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25162698A JP4144079B2 (en) | 1998-09-04 | 1998-09-04 | Variable focus lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25162698A JP4144079B2 (en) | 1998-09-04 | 1998-09-04 | Variable focus lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000081504A true JP2000081504A (en) | 2000-03-21 |
| JP4144079B2 JP4144079B2 (en) | 2008-09-03 |
Family
ID=17225630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25162698A Expired - Fee Related JP4144079B2 (en) | 1998-09-04 | 1998-09-04 | Variable focus lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4144079B2 (en) |
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