JPH10253898A - Drive mechanism for variable focal lens - Google Patents
Drive mechanism for variable focal lensInfo
- Publication number
- JPH10253898A JPH10253898A JP7440497A JP7440497A JPH10253898A JP H10253898 A JPH10253898 A JP H10253898A JP 7440497 A JP7440497 A JP 7440497A JP 7440497 A JP7440497 A JP 7440497A JP H10253898 A JPH10253898 A JP H10253898A
- Authority
- JP
- Japan
- Prior art keywords
- holding frame
- optical system
- air
- lens
- focusing optical
- 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.)
- Withdrawn
Links
Landscapes
- Instruments For Viewing The Inside Of Hollow Bodies (AREA)
- Lens Barrels (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、内視鏡等に用いら
れる対物レンズの駆動機構に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving mechanism for an objective lens used in an endoscope or the like.
【０００２】[0002]
【従来の技術】従来医療の分野で用いられる内視鏡に
は、人間の体内に挿入するという性質上サイズに制限が
あるため、対物レンズの構成もカメラ等の他の光学機器
に比べ簡易な構成となっている。2. Description of the Related Art Conventional endoscopes used in the medical field have a limited size due to the nature of being inserted into a human body, so that the configuration of an objective lens is simpler than other optical devices such as a camera. It has a configuration.
【０００３】[0003]
【発明が解決しようとする課題】ところが、簡易なレン
ズ構成であるためその光学的機能は満足のいくものとは
いえない。特に絞り調節機能等を設けることができない
ことに帰因する被写界深度の狭さにより、患部等の本来
観察を必要とする部分を速やかに特定するのが困難であ
った。However, the optical function is not satisfactory because of the simple lens configuration. In particular, it is difficult to quickly specify a portion, such as a diseased part, which should originally be observed, due to the narrow depth of field resulting from the inability to provide an aperture adjustment function or the like.
【０００４】本発明は、以上の問題を解決するものであ
り、簡易な装置構成による可変焦点レンズ駆動機構を提
供することを目的としている。An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a variable focus lens driving mechanism having a simple device configuration.
【０００５】[0005]
【課題を解決するための手段】本発明に係るレンズ駆動
機構は、焦点光学系と、焦点光学系を保持する保持枠と
を有し、保持枠を所定の周期で焦点光学系の光軸方向に
沿って往復動させることにより焦点光学系の被写界深度
を擬似的に深くすることを特徴とする。A lens driving mechanism according to the present invention has a focusing optical system and a holding frame for holding the focusing optical system, and the holding frame is moved at a predetermined cycle in the optical axis direction of the focusing optical system. The depth of field of the focusing optical system is artificially increased by reciprocating along.
【０００６】好ましくは、保持枠を空気圧により約１０
０Ｈｚの周期で往復動させる。[0006] Preferably, the holding frame is pneumatically moved for about 10 minutes.
Reciprocate at a cycle of 0 Hz.
【０００７】また、本発明に係るレンズ駆動機構は、エ
ア挿入手段と、エア排出手段と、焦点光学系をを固定す
る保持枠と、付勢手段とを備えたレンズ駆動機構であっ
て、エア注入手段より注入されるエアにより焦点光学系
のバックフォーカスが長くなるよう保持枠を焦点光学系
の光軸に沿って駆動し、エア排出手段によりエアが排出
されると共に付勢手段により焦点光学系のバックフォー
カスが短くなるよう保持枠を焦点光学系の光軸に沿って
駆動することを特徴とする。[0007] A lens driving mechanism according to the present invention is a lens driving mechanism provided with air insertion means, air discharging means, a holding frame for fixing a focusing optical system, and urging means. The holding frame is driven along the optical axis of the focusing optical system so that the back focus of the focusing optical system is lengthened by the air injected from the injecting means, the air is discharged by the air discharging means, and the focusing optical system is biased by the urging means. The holding frame is driven along the optical axis of the focusing optical system so that the back focus becomes short.
【０００８】例えば、焦点光学系が内視鏡の対物レンズ
である。[0008] For example, the focusing optical system is an objective lens of an endoscope.
【０００９】[0009]
【発明の実施の形態】以下、本発明の実施の形態を図面
を参照して説明する。図１は、本発明に係るレンズ駆動
機構が適用された内視鏡の先端部分を示す断面図であ
る。内視鏡の先端部１には円筒状の凹部１０が設けられ
ている。凹部１０の内面において凹部１０の底面１２の
略中央には穴１３が穿設されている。穴１３には先端部
１と図示しない制御機構とを連結する連通管を挿通する
ファイバーバンドル２０が挿入され、ファイバーバンド
ル２０の先端は凹部１０内に突出している。凹部１０の
開口部１１近傍には円筒状のレンズ保持枠３０が配設さ
れている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a distal end portion of an endoscope to which a lens driving mechanism according to the present invention is applied. A cylindrical concave portion 10 is provided at the distal end portion 1 of the endoscope. In the inner surface of the recess 10, a hole 13 is formed substantially at the center of the bottom surface 12 of the recess 10. A fiber bundle 20 is inserted into the hole 13 to penetrate a communication pipe connecting the distal end portion 1 and a control mechanism (not shown), and the distal end of the fiber bundle 20 projects into the concave portion 10. A cylindrical lens holding frame 30 is provided near the opening 11 of the recess 10.
【００１０】対物レンズ４０はレンズ保持枠３０内の一
方の端部に固定されている。レンズ保持枠３０の他方の
端部には、ファイバーバンドル２０の先端が挿入されて
おり、対物レンズ４０により結像した被写界像を図示し
ない制御機構に伝送する。The objective lens 40 is fixed to one end of the lens holding frame 30. The distal end of the fiber bundle 20 is inserted into the other end of the lens holding frame 30, and transmits an object image formed by the objective lens 40 to a control mechanism (not shown).
【００１１】レンズ保持枠３０の外側面において内視鏡
１の先端部近傍には、外周囲を一周する環状溝３０ａが
形成されている。環状溝３０ａは対物レンズ４０の光軸
に対して垂直な面と平行に形成されている。さらに環状
溝３０ａから凹部１０の底面１２の方向に所定の距離を
置いて環状溝３０ｂが同様に形成されている。さらに、
凹部１０の内壁１４にはレンズ保持枠３０の環状溝３０
ａ、３０ｂに対応する位置に、環状溝１４ａ、１４ｂが
形成されている。An annular groove 30a is formed on the outer surface of the lens holding frame 30 near the distal end of the endoscope 1 so as to make a round around the outer periphery. The annular groove 30a is formed parallel to a plane perpendicular to the optical axis of the objective lens 40. Further, an annular groove 30b is similarly formed at a predetermined distance from the annular groove 30a toward the bottom surface 12 of the concave portion 10. further,
The annular groove 30 of the lens holding frame 30 is provided on the inner wall 14 of the concave portion 10.
Annular grooves 14a, 14b are formed at positions corresponding to a, 30b.
【００１２】レンズ保持枠３０の環状溝３０ａおよび凹
部１０の環状溝１４ａには円盤状の板バネであるダイヤ
フラム５０が嵌合し、レンズ保持枠３０の環状溝３０ｂ
および凹部１０の環状溝１４ｂには同様のダイヤフラム
５１が嵌合している。すなわち、ダイヤフラム５０の内
周縁が内周に沿って環状溝３０ａに嵌合し、外周縁が外
周に沿って環状溝１４ａに嵌合し、同様にダイヤフラム
５１の内周縁が内周に沿って環状溝３０ｂに嵌合し、外
周縁が外周に沿って環状溝１４ｂに嵌合している。以上
のように、レンズ保持枠３０はダイヤフラム５０、５１
を介して内視鏡１に支持され、かつ内視鏡１の凹部１０
とレンズ保持枠３０により形成される断面形状が環状で
ある空間を遮断している。A diaphragm 50, which is a disc-shaped leaf spring, is fitted into the annular groove 30a of the lens holding frame 30 and the annular groove 14a of the concave portion 10, and the annular groove 30b of the lens holding frame 30 is fitted.
A similar diaphragm 51 is fitted in the annular groove 14b of the concave portion 10. That is, the inner peripheral edge of the diaphragm 50 fits in the annular groove 30a along the inner circumference, the outer peripheral edge fits in the annular groove 14a along the outer circumference, and the inner peripheral edge of the diaphragm 51 similarly forms an annular shape along the inner circumference. The outer peripheral edge is fitted into the annular groove 14b along the outer periphery. As described above, the lens holding frame 30 is provided with the diaphragms 50 and 51.
Supported by the endoscope 1 through the
And the space in which the cross-sectional shape formed by the lens holding frame 30 is annular.
【００１３】レンズ保持枠３０と凹部１０の間隙にはス
プリング６０が配設されている。スプリング６０の一方
の端部はレンズ保持枠３０に固定され、他方の端部は内
視鏡１の凹部１０の底面１２に固定され、ファイバーハ
ンドル２０の外側面を巻回するように配設されている。
スプリング６０は、レンズ保持枠３０を対物レンズ４０
の光軸に平行にファイバーバンドル２０に近づける方向
Ａに付勢している。A spring 60 is provided in a gap between the lens holding frame 30 and the concave portion 10. One end of the spring 60 is fixed to the lens holding frame 30, and the other end is fixed to the bottom surface 12 of the concave portion 10 of the endoscope 1, and is disposed so as to wind around the outer surface of the fiber handle 20. ing.
The spring 60 connects the lens holding frame 30 to the objective lens 40.
In the direction A approaching the fiber bundle 20 in parallel with the optical axis of.
【００１４】穴１３の近傍には穴１３に沿って延びるエ
ア注入のためのチューブ７０が設けられており、凹部１
０の底面１２で開口している。また凹部１０の内壁１４
の底面１２近傍において、ファイバーバンドル２０を挟
んでチューブ７０の開口部の反対側には、エア排出口８
０が設けられている。エア排出口８０は、送気口９０に
連結している。In the vicinity of the hole 13, a tube 70 for injecting air extending along the hole 13 is provided.
0 is open at the bottom surface 12. Also, the inner wall 14 of the recess 10
Near the opening 12 of the tube 70 with the fiber bundle 20 interposed therebetween near the bottom surface 12 of the air outlet 8.
0 is provided. The air outlet 80 is connected to the air outlet 90.
【００１５】チューブ７０よりエアを送り込むと、凹部
１０、ファイバーバンドル２０、レンズ保持枠３０、対
物レンズ４０およびダイヤフラム５１により規定される
空間Ｓの容積が増加し、レンズ保持枠３０に対してファ
イバーバンドル２０から遠ざかる方向Ｂの推力が作用す
る。レンズ保持枠３０は上述のように板バネであるダイ
ヤフラム５０および５１を介して内視鏡１の凹部１０に
支持されているため、この推力により図２に示すように
レンズ保持枠３０は方向Ｂへ駆動される。When air is supplied from the tube 70, the volume of the space S defined by the recess 10, the fiber bundle 20, the lens holding frame 30, the objective lens 40, and the diaphragm 51 increases, and the fiber bundle with respect to the lens holding frame 30. The thrust in the direction B moving away from 20 acts. Since the lens holding frame 30 is supported by the concave portion 10 of the endoscope 1 via the diaphragms 50 and 51 as leaf springs as described above, the thrust forces the lens holding frame 30 in the direction B as shown in FIG. Is driven.
【００１６】チューブ７０からのエアの注入を停止する
と、空間Ｓ中のエアがエア排出口８０から送気口９０へ
と排出されるため、空間Ｓの容積は縮小し、それと共に
スプリング６０の付勢力によりレンズ保持枠３０は図１
に示す位置に戻される。When the injection of the air from the tube 70 is stopped, the air in the space S is discharged from the air discharge port 80 to the air supply port 90, so that the volume of the space S is reduced, and at the same time, the spring 60 is attached. The lens holding frame 30 is shown in FIG.
Is returned to the position shown in.
【００１７】対物レンズ４０はレンズ保持枠３０に固定
されているため、レンズ保持枠３０の駆動と共に移動す
る。すなわち、チューブ７０からエアを注入するとレン
ズ保持枠３０のＢ方向への駆動により対物レンズ４０の
バックフォーカスはより長くなると共にファイバーバン
ドル２０の先端に合焦する物体距離はより短くなり、エ
アが排出口８０から排出されるとレンズ保持枠３０のＡ
方向への駆動により対物レンズ４０のバックフォーカス
はより短くなると共に物体距離はより長くなる。Since the objective lens 40 is fixed to the lens holding frame 30, it moves with the driving of the lens holding frame 30. That is, when air is injected from the tube 70, the back focus of the objective lens 40 becomes longer due to the driving of the lens holding frame 30 in the direction B, the object distance focused on the tip of the fiber bundle 20 becomes shorter, and the air is exhausted. When discharged from the outlet 80, the A of the lens holding frame 30
By driving in the direction, the back focus of the objective lens 40 becomes shorter and the object distance becomes longer.
【００１８】焦点距離ｆが１．２８９６ｍｍ（ミリメー
トル）であるレンズのバックフォーカスｆB と物体距離
ａの関係を表１に示す。[0018] showing the relationship between the focal length f the back focus of the lens is 1.2896Mm (millimeters) f B and the object distance a in Table 1.
【表１】 [Table 1]
【００１９】対物レンズ４０に焦点距離ｆが１．２８９
６ｍｍであるレンズを用い、対物レンズ４０のバックフ
ォーカスｆB が１．３３１ｍｍ〜１．５３１ｍｍの範囲
で移動するようにエアの注入を所定の周期、例えば１０
０Ｈｚで繰り返すと、対物レンズ４０の物体距離ａは
８．０１２ｍｍ〜１３３．６６９ｍｍの範囲で高速に伸
縮し、被写界深度は擬似的に深くなる。そのため、広範
囲の被写界像を目視することが可能となる。The focal length f of the objective lens 40 is 1.289.
Using a lens is 6 mm, dispensing a predetermined period of air as the back focus f B of the objective lens 40 is moved in the range of 1.331Mm～1.531Mm, for example 10
When it is repeated at 0 Hz, the object distance a of the objective lens 40 expands and contracts at high speed within the range of 8.012 mm to 133.669 mm, and the depth of field becomes pseudo deep. Therefore, it is possible to view a wide range of the scene image.
【００２０】以上のように本実施形態によれば、簡易な
構成で対物レンズ４０のバックフォーカスおよび物体距
離を変えることができ、擬似的に被写界深度を深くする
ことができる。As described above, according to the present embodiment, the back focus and the object distance of the objective lens 40 can be changed with a simple configuration, and the depth of field can be artificially increased.
【００２１】また、レンズ保持枠３０の駆動源にエアを
用いているため、電気的に駆動する手段と比べて安全で
ある。Further, since air is used as a driving source of the lens holding frame 30, the driving is safer than an electrically driven means.
【００２２】[0022]
【発明の効果】以上のように、本発明によれば可変焦点
レンズ駆動機構を簡易な装置構成により得ることができ
る。As described above, according to the present invention, the varifocal lens driving mechanism can be obtained with a simple device configuration.
【図１】本発明に係る可変焦点レンズ駆動機構が適用さ
れた内視鏡の先端部分を示す断面図である。FIG. 1 is a sectional view showing a distal end portion of an endoscope to which a variable focus lens driving mechanism according to the present invention is applied.
【図２】エア注入時の内視鏡の先端部分を示す断面図で
ある。FIG. 2 is a cross-sectional view showing a distal end portion of the endoscope when air is injected.
２０ ファイバーバンドル ３０ レンズ保持枠 ４０ 対物レンズ ５０、５１ ダイヤフラム ６０ スプリング ７０ チューブ ８０ エア排出口 ９０ 送気口 Reference Signs List 20 fiber bundle 30 lens holding frame 40 objective lens 50, 51 diaphragm 60 spring 70 tube 80 air discharge port 90 air supply port
Claims (5)
る保持枠とを有し、前記保持枠を所定の周期で前記焦点
光学系の光軸方向に沿って往復動させることにより前記
焦点光学系の被写界深度を擬似的に深くすることを特徴
とする可変焦点レンズ駆動機構。1. A focusing optical system comprising: a focusing optical system; and a holding frame for holding the focusing optical system, wherein the holding frame is reciprocated along a direction of an optical axis of the focusing optical system at a predetermined cycle. A variable focus lens drive mechanism characterized in that the depth of field of the optical system is artificially increased.
ことを特徴とする請求項１に記載の可変焦点レンズ駆動
機構。2. The varifocal lens driving mechanism according to claim 1, wherein said holding frame is reciprocated by air pressure.
徴とする請求項１に記載の可変焦点レンズ駆動機構。3. The varifocal lens driving mechanism according to claim 1, wherein the period is about 100 Hz.
光学系を固定する保持枠と、付勢手段とを備えたレンズ
駆動機構であって、前記エア注入手段より注入されるエ
アにより前記焦点光学系のバックフォーカスが長くなる
よう前記保持枠を前記焦点光学系の光軸に沿って駆動
し、前記エア排出手段によりエアが排出されると共に前
記付勢手段により前記焦点光学系のバックフォーカスが
短くなるよう前記保持枠を前記焦点光学系の光軸に沿っ
て駆動することを特徴とする可変焦点レンズ駆動機構。4. A lens driving mechanism comprising an air injection means, an air discharge means, a holding frame for fixing a focusing optical system, and an urging means, wherein the lens is driven by air injected from the air injection means. The holding frame is driven along the optical axis of the focusing optical system so that the back focus of the focusing optical system becomes longer, air is discharged by the air discharging means, and the back focus of the focusing optical system is reduced by the urging means. A variable focus lens driving mechanism, wherein the holding frame is driven along the optical axis of the focusing optical system so that the length of the lens is shortened.
あることを特徴とする請求項１または４に記載の可変焦
点レンズ駆動機構。5. The variable focus lens driving mechanism according to claim 1, wherein the focusing optical system is an objective lens of an endoscope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7440497A JPH10253898A (en) | 1997-03-11 | 1997-03-11 | Drive mechanism for variable focal lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7440497A JPH10253898A (en) | 1997-03-11 | 1997-03-11 | Drive mechanism for variable focal lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10253898A true JPH10253898A (en) | 1998-09-25 |
Family
ID=13546227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7440497A Withdrawn JPH10253898A (en) | 1997-03-11 | 1997-03-11 | Drive mechanism for variable focal lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10253898A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005334641A (en) * | 2004-05-27 | 2005-12-08 | Stm Medizintechnik Starnberg Gmbh | Zoom objective lens for endoscope apparatus |
| JP2010128354A (en) * | 2008-11-28 | 2010-06-10 | Olympus Medical Systems Corp | Stereo optical system, optical device for stereo measurement using stereo optical system thereof, stereo measurement device, and stereo observation device |
-
1997
- 1997-03-11 JP JP7440497A patent/JPH10253898A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005334641A (en) * | 2004-05-27 | 2005-12-08 | Stm Medizintechnik Starnberg Gmbh | Zoom objective lens for endoscope apparatus |
| JP2010128354A (en) * | 2008-11-28 | 2010-06-10 | Olympus Medical Systems Corp | Stereo optical system, optical device for stereo measurement using stereo optical system thereof, stereo measurement device, and stereo observation device |
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