JPH07287156A - Lens barrel - Google Patents
Lens barrelInfo
- Publication number
- JPH07287156A JPH07287156A JP8166194A JP8166194A JPH07287156A JP H07287156 A JPH07287156 A JP H07287156A JP 8166194 A JP8166194 A JP 8166194A JP 8166194 A JP8166194 A JP 8166194A JP H07287156 A JPH07287156 A JP H07287156A
- Authority
- JP
- Japan
- Prior art keywords
- lens group
- moving
- lens
- moving lens
- lens barrel
- 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
- 230000003287 optical effect Effects 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 description 4
- 230000004075 alteration Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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- Lens Barrels (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はレンズ鏡筒、特にズーム
レンズにおいてそのフォーカスレンズ群を主移動レンズ
群と従移動レンズ群より構成し、物体距離の変化に対し
て主・従の移動レンズ群との相対的な位置関係を変化さ
せるフォーカシング方式のレンズ駆動機構に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel, particularly a zoom lens, in which the focus lens group is composed of a main moving lens group and a sub moving lens group, and the main and sub moving lens groups are adapted to changes in the object distance. The present invention relates to a focusing-type lens driving mechanism that changes a relative positional relationship with the lens.
【０００２】[0002]
【従来の技術】従来のフォーカシング方式による収差変
動を抑制する為に、例えばズームレンズにおけるフォー
カスレンズ群を複数のレンズ群に分割し、各レンズ群の
相対的位置関係を変化させフォーカシングを行なうレン
ズ鏡筒が提案されている。2. Description of the Related Art In order to suppress aberration variation caused by a conventional focusing method, for example, a focus lens group in a zoom lens is divided into a plurality of lens groups, and a relative positional relationship between the lens groups is changed to perform focusing. A cylinder has been proposed.
【０００３】４群のレンズ群で構成されるズームレンズ
において、フォーカスレンズ群は口径が大きく大重量の
複数に分割された移動レンズ群を水平状態のみならず、
種々の撮影状態において使用可能とするために、仰角、
俯角状態においても小さなトルクで駆動させる必要があ
ることや、合焦操作を容易（微調整可能）にする等の理
由によりリードを小さくし複数回転制御が可能なヘリコ
イドネジがその駆動に多用されている。In a zoom lens composed of four lens groups, the focus lens group has a large aperture and a large moving lens group divided into a plurality of parts, not only in a horizontal state but also in a horizontal state.
In order to be able to use it in various shooting conditions,
Due to the fact that it is necessary to drive with a small torque even in the depression state, and because the focusing operation is easy (fine adjustment is possible), the lead is small and a helicoid screw that can control multiple rotations is often used for driving. There is.
【０００４】また、複数の移動レンズ群をある光学関係
に基づいてその相対的な位置関係を変化させながら移動
させる機構としては、図２０〜図２３に示すカムを用い
たズーム系の駆動機構が提案されている。As a mechanism for moving a plurality of moving lens groups while changing their relative positional relationship based on a certain optical relationship, a zoom system drive mechanism using a cam shown in FIGS. 20 to 23 is used. Proposed.
【０００５】図２０は、円柱カム１０４を用いた例で、
ズーム系の側断面を示し、図２１はそのＫ−Ｋ断面図を
示している。図２２は円筒カム１１４を用いた例で、図
２３はそのＬ−Ｌ断面図を示す。バリエーターレンズ群
Ｖ1 ，Ｖ2 及びコンペンセーターレンズ群Ｃ1 ，Ｃ2 は
固定鏡筒１０１，１１１に光軸と平行に設けられた直線
溝１０１ａ，１０１ｂ，１１１ａ，１１１ｂにてその回
転を規制され、円柱カム１０４または円筒カム１１４に
光学関係に基づいて設けられたカム溝１０４ａ，１０４
ｂまたは１１４ａ，１１４ｂに従って光軸上を移動する
ように構成されている。FIG. 20 shows an example using a cylindrical cam 104.
FIG. 21 shows a side cross section of the zoom system, and FIG. 21 shows a KK cross sectional view thereof. FIG. 22 shows an example using the cylindrical cam 114, and FIG. 23 shows a sectional view taken along the line LL. The rotations of the variator lens groups V 1 and V 2 and the compensator lens groups C 1 and C 2 are restricted by linear grooves 101a, 101b, 111a and 111b provided in the fixed lens barrels 101 and 111 in parallel with the optical axis. , The cam grooves 104a, 104 provided on the cylindrical cam 104 or the cylindrical cam 114 based on the optical relationship.
It is configured to move on the optical axis according to b or 114a, 114b.
【０００６】[0006]
【発明が解決しようとしている課題】しかしながら、前
述した図２０および図２２に示す従来例では、同一部材
にバリエータレンズ群とコンペンヒータレンズ群用のカ
ム溝を有する円柱又は円筒カムは、比較的口径が小さく
て軽量なレンズ群を高速駆動するズーム系の制御には適
しているが、フォーカスレンズ群を構成する複数のレン
ズ群を駆動するには以下の理由で適さない。However, in the conventional example shown in FIGS. 20 and 22, the columnar or cylindrical cam having the cam grooves for the variator lens group and the compensator lens group in the same member has a relatively small diameter. Is suitable for controlling a zoom system that drives a small and lightweight lens group at high speed, but is not suitable for driving a plurality of lens groups forming a focus lens group for the following reason.
【０００７】すなわち、前述したヘリコイドネジを駆動
に用いる場合のようにフォーカスの制御にはリードを小
さくする必要があるが、円柱カムでリードを小さくする
には、円柱径をかなり大きくする必要があり、大口径の
フォーカスレンズ群の外にこれを設けることは、レンズ
が巨大化し実使用上好ましくない。That is, it is necessary to make the lead small for focus control as in the case where the above-mentioned helicoid screw is used for driving, but in order to make the lead small in the cylinder cam, it is necessary to make the cylinder diameter considerably large. It is not preferable for practical use to provide this outside the large-diameter focus lens group because the lens becomes huge.
【０００８】そこで、複数個のリードの異なるヘリコイ
ドネジを使用すれば主・従移動群の１次関数的相対移動
は可能であるが、高次関数的相対移動は不可能である。Therefore, by using a plurality of helicoid screws having different leads, it is possible to perform a relative linear movement of the main / slave movement group but not a relative movement of a higher order function.
【０００９】[0009]
【課題を解決するための手段および作用】請求項１に記
載の発明は、第１の移動レンズ群と第２の移動レンズ群
とから構成される合焦用レンズ群と、物体距離の変化に
より該第１の移動レンズ群と該第２の移動レンズ群との
相対的な位置関係を変化させるレンズ位置可変手段を有
するレンズ鏡筒において、該レンズ位置可変手段は、主
駆動手段を介して駆動される第１の移動レンズ群の駆動
力を受けて第２の移動レンズ群を移動させる従動駆動手
段を有することを特徴とする。According to a first aspect of the present invention, there is provided a focusing lens group including a first moving lens group and a second moving lens group, and a change in object distance. In a lens barrel having lens position changing means for changing the relative positional relationship between the first moving lens group and the second moving lens group, the lens position changing means is driven by a main driving means. It is characterized by further comprising driven drive means for receiving the driving force of the first moving lens group and moving the second moving lens group.
【００１０】この構成によれば、第１の移動レンズ群を
移動させると、第２の移動レンズ群が第１の移動レンズ
群の駆動力を受けて従動駆動される。According to this structure, when the first moving lens group is moved, the second moving lens group is driven by the driving force of the first moving lens group.
【００１１】請求項２に記載の発明は、第１の移動レン
ズ群と第２の移動レンズ群とから構成される合焦用レン
ズ群と、物体距離の変化により該第１の移動レンズ群と
該第２の移動レンズ群との相対的な位置関係を変化させ
るレンズ位置可変手段を有するレンズ鏡筒において、該
レンズ位置可変手段は、駆動力を第１の移動レンズ群に
伝達する主駆動手段と、該駆動力を第２の移動レンズ群
に伝達する該主駆動手段とは伝達方式の異なる従動駆動
手段を有することを特徴とする。According to a second aspect of the present invention, there are provided a focusing lens group including a first moving lens group and a second moving lens group, and the first moving lens group depending on a change in object distance. In a lens barrel having a lens position changing means for changing a relative positional relationship with the second moving lens group, the lens position changing means transmits a driving force to the first moving lens group. And a driven drive means having a different transmission system from the main drive means for transmitting the driving force to the second moving lens group.
【００１２】この構成によれば、第１の移動レンズ群と
第２の移動レンズ群とは別々に駆動されて両レンズ群の
相対的距離が変更されるが、駆動方式が異なるため、第
１の移動レンズ群と第２の移動レンズ群との調整粗度が
異なり、一方のレンズ群を他法のレンズ群に対して微調
整させることができる。According to this structure, the first moving lens group and the second moving lens group are driven separately to change the relative distance between the two lens groups, but since the driving method is different, the first moving lens group is changed. The adjustment roughness of the second moving lens group is different from that of the second moving lens group, and one lens group can be finely adjusted with respect to the lens groups of other methods.
【００１３】請求項３に記載の発明は、請求項１または
２において、主駆動手段は駆動力を第１の移動レンズ群
に伝達するヘリコイドねじにより構成され、従動駆動手
段は従動駆動力を第２の移動レンズ群に伝達するカム機
構で構成されていることを特徴とする。According to a third aspect of the present invention, in the first or second aspect, the main driving means is composed of a helicoid screw for transmitting the driving force to the first moving lens group, and the driven driving means is the driven driving force. It is characterized in that it is constituted by a cam mechanism that transmits to the second moving lens group.
【００１４】この構成によれば、第１のレンズ群と第２
のレンズ群との調整性を異ならせることができる。According to this structure, the first lens group and the second lens group
The adjustability with the lens group can be different.
【００１５】請求項４に記載の発明は、請求項１または
３において、従動駆動手段における従動駆動力は第１の
移動レンズ群の光軸方向の移動により与えられることを
特徴とする。According to a fourth aspect of the present invention, in the first or third aspect, the driven driving force of the driven driving means is given by the movement of the first moving lens group in the optical axis direction.
【００１６】この構成によれば、第１の移動レンズ群を
ヘリコイド結合により回転駆動する機構が使用できる。According to this structure, a mechanism for rotationally driving the first moving lens group by helicoid coupling can be used.
【００１７】請求項５に記載の発明は、請求項１または
３において、従動駆動手段における従動駆動力は第１の
移動レンズの光軸の回りの回転により与えられることを
特徴とする。According to a fifth aspect of the present invention, in the first or third aspect, the driven driving force of the driven driving means is given by rotation of the first moving lens about the optical axis.
【００１８】この構成によれば、第１の移動レンズ群を
直進溝とカム溝を用いたカム機構により直進移動させる
機構が使用できる。According to this structure, it is possible to use a mechanism for moving the first moving lens group in a straight line by a cam mechanism using a straight line groove and a cam groove.
【００１９】[0019]
【実施例】図１〜図６は、本発明の第１の実施例を示
す。1 to 6 show a first embodiment of the present invention.
【００２０】本実施例において主フォーカスレンズ群の
駆動力の伝達はヘリコイドを利用し、ヘリコイドとして
円柱カム、すなわち棒状のヘリコイドを用いている。In this embodiment, a helicoid is used to transmit the driving force of the main focus lens group, and a cylindrical cam, that is, a rod-shaped helicoid is used as the helicoid.
【００２１】なお、図１はフォーカス部の側断面図、図
２及び図３はそれぞれ図１のＡ−Ａ断面図、Ｂ−Ｂ断面
図を示す。FIG. 1 is a side sectional view of the focus portion, and FIGS. 2 and 3 are sectional views taken along the lines AA and BB of FIG. 1, respectively.
【００２２】図中、フォーカスレンズ群は主フォーカス
移動レンズ群Ｍと従フォーカス移動レンズ群Ｆにより構
成され、主フォーカス移動レンズ群Ｍの支持鏡筒２の一
端に固定された断面コの字形の連結部材としては、メス
ヘリコイド５の外周に設けられた二面幅形状の切欠きと
係合し、メスヘリコイド５の回転を規制して支持鏡筒２
とメスヘリコイド５を連結している。In the figure, the focus lens group is composed of a main focus moving lens group M and a sub focus moving lens group F, and is connected to one end of the support barrel 2 of the main focus moving lens group M and has a U-shaped cross section. As a member, the support lens barrel 2 is engaged with the female helicoid 5 by engaging with a notch having a dihedral width provided on the outer periphery of the female helicoid 5 to restrict the rotation of the female helicoid 5.
And female helicoid 5 are connected.
【００２３】支持鏡筒２は、固定鏡筒１に設けられた光
軸に平行な複数の直線溝１ａと係合する回転部材２ａに
より回転が規制され、オスヘリコイド６に付加された回
転量に比例して光軸上を移動する。７は、オスヘリコイ
ド６の回転支持部材であり、オスヘリコイド６の軸廻り
の回転は許容するが、光軸方向への移動は規制する。一
方、従フォーカスレンズ群Ｆの支持鏡筒３１に設けられ
た複数の回転部材３ａ及び３ｂは、夫々支持鏡筒２に設
けられた光軸に平行な直線溝２ｂ及び支持鏡筒２の外周
と係合して回転するカム環４に設けられたカム溝４ａと
係合している。また、カム環４の外周には、光軸とある
角度をなすように設けられた直線溝４ｂが形成され、固
定鏡筒１より突出した固定ピン１ｂと係合している。図
１の（ｂ）はカム環４に設けられた直線溝４ｂ及びカム
溝４ａの展開図で図１の（ｂ）にはカム溝４ａは２個の
み図示している。上記構成において、オスヘリコイド６
を所定の方向に回転することにより、主フォーカスレン
ズ群Ｍが鏡筒２と共に移動し、鏡筒２に支持されたカム
環４が鏡筒２とともにＸ方向に移動する際に、固定ピン
１ｂにより光軸とφなる角度を有する直線溝４ｂの壁を
押す分力が発生し、カム環４をＹ方向に回転させる力が
作用する。すなわち、カム環４は、光軸上の移動量ＸM
と光軸中心の回転量θを同時に得ることになる。このよ
うに、主フォーカス移動レンズ群と従フォーカス移動レ
ンズ群をフォーカシングに際して異なる移動連度で制御
させることにより、物体距離変動に伴う光学性能を良好
に維持している。The rotation of the supporting lens barrel 2 is restricted by a rotating member 2a engaged with a plurality of linear grooves 1a provided in the fixed lens barrel 1 and parallel to the optical axis, and the rotation amount added to the male helicoid 6 is controlled. Move proportionally on the optical axis. Reference numeral 7 denotes a rotation supporting member for the male helicoid 6, which allows the male helicoid 6 to rotate about its axis, but restricts its movement in the optical axis direction. On the other hand, the plurality of rotating members 3a and 3b provided on the support barrel 31 of the sub-focus lens group F respectively include the linear groove 2b parallel to the optical axis provided on the support barrel 2 and the outer periphery of the support barrel 2. It engages with a cam groove 4a provided in the cam ring 4 that engages and rotates. A linear groove 4b is formed on the outer circumference of the cam ring 4 so as to form an angle with the optical axis, and engages with a fixed pin 1b protruding from the fixed barrel 1. FIG. 1B is a development view of the linear groove 4b and the cam groove 4a provided on the cam ring 4, and only two cam grooves 4a are shown in FIG. 1B. In the above configuration, the male helicoid 6
Is rotated in a predetermined direction, the main focus lens group M moves together with the lens barrel 2, and when the cam ring 4 supported by the lens barrel 2 moves in the X direction together with the lens barrel 2, it is fixed by the fixing pin 1b. A component force that pushes the wall of the straight groove 4b having an angle of φ with the optical axis is generated, and a force that rotates the cam ring 4 in the Y direction acts. That is, the cam ring 4 moves on the optical axis X M.
And the rotation amount θ of the optical axis center are obtained at the same time. In this way, by controlling the main focus moving lens group and the sub focus moving lens group with different movement degrees during focusing, the optical performance due to the object distance variation is maintained well.
【００２４】今、主フォーカス移動群Ｍに対する従フォ
ーカス移動群Ｆの相対変化量が主移動群Ｍの移動量ＸM
の関数ｇ（ＸM ）で与えられ、カム溝４ａで形成される
軌跡となる場合、図１の（ｃ）に示すように、従移動群
Ｆの固定鏡筒１に対する絶対移動量ＸF はＸM ＋ｇ（Ｘ
M ）となる。図４〜図６はその作動状態を示し、始点、
中点、終点を表わす。Now, the relative change amount of the sub focus movement unit F with respect to the main focus movement unit M is the movement amount X M of the main movement unit M.
When the locus is given by the function g (X M ) and is formed by the cam groove 4a, the absolute movement amount X F of the follower movement group F with respect to the fixed lens barrel 1 is as shown in FIG. 1 (c). X M + g (X
M ). 4 to 6 show the operating state of the starting point,
Indicates the midpoint and end point.
【００２５】すなわち、ｇ（ＸM ）を変化させることに
より、自由にＦX を変えることが可能で、図７の
（ａ），（ｂ），（ｃ）に夫々その例を示す。That is, F x can be freely changed by changing g (X M ), and examples thereof are shown in FIGS. 7 (a), 7 (b) and 7 (c).
【００２６】図８は、本発明の第２の実施例を示す。本
実施例はカム環８の回転力を、カム環８の外周に設けた
歯車８ｂとかみ合う、主フォーカスレンズ群Ｍを駆動す
るオスヘリコイド６に設けた歯車６ａから伝達して与え
るようにしたものである。したがって、鏡筒２の直接移
動力を直接利用して従フォーカスレンズ群Ｆの駆動を行
なわないが、オスヘリコイド６の駆動力によりカム環８
の回動が行なわれ、従フォーカスレンズ群Ｆの移動が行
なわれる。FIG. 8 shows a second embodiment of the present invention. In this embodiment, the rotational force of the cam ring 8 is transmitted from the gear 6a provided on the male helicoid 6 that drives the main focus lens group M and meshes with the gear 8b provided on the outer periphery of the cam ring 8. Is. Therefore, the sub-focus lens group F is not driven by directly using the direct moving force of the lens barrel 2, but the cam ring 8 is driven by the driving force of the male helicoid 6.
Is rotated and the secondary focus lens group F is moved.
【００２７】図９ないし図１１は本発明の第３の実施例
を示し、主フォーカスレンズ群Ｍを駆動する手段とし
て、環状ヘリコイドを用いたものである。9 to 11 show a third embodiment of the present invention in which an annular helicoid is used as a means for driving the main focus lens group M.
【００２８】図９の（ａ）は、フォーカス部の側断面
図、図１０及び図１１はそれぞれ図９中のＣ−Ｃ断面
図、Ｄ−Ｄ断面図である。FIG. 9A is a side sectional view of the focus portion, and FIGS. 10 and 11 are sectional views taken along the lines CC and DD of FIG. 9, respectively.
【００２９】図中主フォーカス移動レンズ群Ｍの支持鏡
筒１２の外周には、固定鏡筒１１の内径に設けられたメ
スヘリコイド１１ａと係合するオスヘリコイド１２ａが
形成されている。一方、従フォーカス移動レンズ群Ｆの
支持鏡筒１３に設けられた複数の回転部材１３ａ及び１
３ｂは、それぞれ、主フォーカスレンズ群Ｍを保持する
鏡筒１２に設けられた光軸に平行な直線溝１２ｂ及び鏡
筒１２の外周と係合するカム環１４に設けられたカム溝
１４ａと係合している。またカム環１４の外周には光軸
と平行な直線溝１４ｂが形成され、固定鏡筒１１より突
出した固定ピン１１ｂがこの直線溝１４ｂに係合してい
る。図９の（ｂ）は、カム環１４に設けられた直線溝及
びカム溝の展開図で、図中カム溝は２個のみ図示をして
いる。A male helicoid 12a that engages with a female helicoid 11a provided on the inner diameter of the fixed lens barrel 11 is formed on the outer circumference of the support lens barrel 12 of the main focus moving lens group M in the figure. On the other hand, a plurality of rotating members 13a and 1 provided on the support barrel 13 of the sub-focus moving lens group F
Reference numerals 3b respectively relate to a linear groove 12b provided in the lens barrel 12 holding the main focus lens group M and parallel to the optical axis, and a cam groove 14a provided in a cam ring 14 engaging with the outer periphery of the lens barrel 12. I am fit. Further, a linear groove 14b parallel to the optical axis is formed on the outer circumference of the cam ring 14, and a fixing pin 11b protruding from the fixed barrel 11 is engaged with the linear groove 14b. FIG. 9B is a development view of the linear groove and the cam groove provided in the cam ring 14, and only two cam grooves are shown in the drawing.
【００３０】上記構成において、主フォーカスレンズ群
Ｍを駆動するために、回転力が与えられると、鏡筒１２
は、光軸を中心に回転しながら光軸上を移動する。この
時、従移動鏡筒１３は、主移動鏡筒１２に設けられた。
光軸に平行な直線溝１２ｂと係合する回転部材１３ａに
より鏡筒１２とともに回転し、鏡筒１２に支持されたカ
ム環１４は鏡筒１２とともに光軸上を移動する。In the above structure, when a rotational force is applied to drive the main focus lens group M, the lens barrel 12
Moves on the optical axis while rotating around the optical axis. At this time, the sub-moving lens barrel 13 is provided in the main moving lens barrel 12.
The cam ring 14 supported by the lens barrel 12 moves on the optical axis together with the lens barrel 12 by being rotated by the rotating member 13a that engages with the linear groove 12b parallel to the optical axis.
【００３１】一方、カム環１４は固定ピン１１ｂにより
その回転が規制されるため、従移動鏡筒１３は、光軸上
を主移動鏡筒１２に対しカム溝１４ａに沿った相対移動
が可能となる。On the other hand, since the rotation of the cam ring 14 is restricted by the fixing pin 11b, the sub-moving lens barrel 13 can move relative to the main moving lens barrel 12 along the cam groove 14a on the optical axis. Become.
【００３２】図１２は第４の実施例を示す。FIG. 12 shows a fourth embodiment.
【００３３】本実施例は、主フォーカスレンズ群Ｍの駆
動に棒状ヘリコイドを用いた例で、ヘリコイド６に設け
た平歯車６ａが従フォーカス移動鏡筒２３の外周に形成
した平歯車２３ｂに噛合う。又、従移動群鏡筒２３の外
周に形成された回転部材２３ａが鏡筒２２に形成された
カム溝２２ｂに係合する。This embodiment is an example in which a rod-shaped helicoid is used to drive the main focus lens group M, and a spur gear 6a provided on the helicoid 6 meshes with a spur gear 23b formed on the outer periphery of the secondary focus moving lens barrel 23. . Further, the rotating member 23a formed on the outer circumference of the sub-moving group lens barrel 23 engages with the cam groove 22b formed on the lens barrel 22.
【００３４】したがって、ヘリコイド６が回転すると、
主フォーカスレンズ群Ｍは光軸に沿って直進移動する。
また、平歯車６ａ，２３ｂ同士の噛合により従フォーカ
ス移動鏡筒２３は回転するが、その際、従フォーカス移
動鏡筒２３の回転部材２３ａがカム溝２２ｂに係合して
いるので、従フォーカス移動鏡筒２３も光軸に沿って移
動する。Therefore, when the helicoid 6 rotates,
The main focus lens group M moves straight along the optical axis.
Further, the secondary focus moving lens barrel 23 rotates due to the engagement of the spur gears 6a and 23b, but at that time, since the rotating member 23a of the secondary focus moving lens barrel 23 is engaged with the cam groove 22b, the secondary focus moving lens barrel 23 is moved. The lens barrel 23 also moves along the optical axis.
【００３５】なお、図１３に示す第５の実施例のよう
に、図１２に示す第４の実施例とは逆に、カム溝３３ａ
を従フォーカス移動鏡筒２３に形成し、回転部材２３ａ
を主フォーカス移動鏡筒側に設けてもよい。Incidentally, as in the fifth embodiment shown in FIG. 13, contrary to the fourth embodiment shown in FIG. 12, the cam groove 33a is formed.
Is formed on the sub-focus moving lens barrel 23, and the rotary member 23a
May be provided on the main focus moving lens barrel side.
【００３６】図１４は第６の実施例を示す。FIG. 14 shows a sixth embodiment.
【００３７】本実施例は、固定鏡筒４１の内周面に形成
したヘリコイド４１ａと、主フォーカスレンズ群Ｍの鏡
筒４２の外周面に形成したヘリコイド４２ａとを結合さ
せ、鏡筒４２と回転させながら移動できるようにしてい
る。また、主移動鏡筒４２に形成したカム溝４２ｂと、
固定鏡筒４１に形成した直進溝４１ｂに従フォーカス鏡
筒１３から径方向に延びる部材に設けられた回転部材１
３ａ，１３ｂが夫々係合する。すなわち、鏡筒４１が回
転しながら移動するのに対し、鏡筒１３は直進溝４１ｂ
により回転が規制され、鏡筒４１の回転力を受けてカム
溝４２ｂに従って光軸上を直進移動し、主フォーカスレ
ンズ群Ｍと従フォーカスレンズ群Ｆとの相対距離が変化
する。In this embodiment, the helicoid 41a formed on the inner peripheral surface of the fixed lens barrel 41 and the helicoid 42a formed on the outer peripheral surface of the lens barrel 42 of the main focus lens group M are combined to rotate with the lens barrel 42. I am able to move while doing. In addition, a cam groove 42b formed in the main moving lens barrel 42,
Rotating member 1 provided on a member extending in the radial direction from the focus lens barrel 13 according to the rectilinear groove 41b formed in the fixed lens barrel 41.
3a and 13b are engaged with each other. That is, while the lens barrel 41 moves while rotating, the lens barrel 13 has the straight groove 41b.
Due to this, the rotation is regulated, and the rotational force of the lens barrel 41 is received to move straight along the optical axis along the cam groove 42b, and the relative distance between the main focus lens group M and the sub focus lens group F changes.
【００３８】なお、図１５に示す第７実施例のように、
図１４に示す第５の実施例とは逆に、主フォーカス移動
鏡筒５２の内周面に形成したメスヘリコイド５２ａを固
定筒５１の外周面に形成したオスヘリコイド５１ａに結
合させてもよい。Incidentally, as in the seventh embodiment shown in FIG.
Contrary to the fifth embodiment shown in FIG. 14, the female helicoid 52a formed on the inner peripheral surface of the main focus moving lens barrel 52 may be coupled to the male helicoid 51a formed on the outer peripheral surface of the fixed barrel 51.
【００３９】以上の実施例では、従移動レンズ群Ｆを主
移動レンズ群Ｍに内蔵させ、主移動レンズ群に対し従移
動レンズ群が相対移動をするようなカム溝を設けたもの
であるが、図１６〜図１９に示す実施例のように従移動
群を主移動群とは独立に配しそれぞれの移動量の差分が
所望の相対移動関係になるようなカム溝を設けて従フォ
ーカス移動群を制御することも可能である。In the above embodiment, the sub-moving lens group F is built in the main-moving lens group M, and the cam groove is provided so that the sub-moving lens group moves relative to the main-moving lens group. As shown in FIGS. 16 to 19, the sub-movement group is arranged independently of the main-movement group, and the sub-focus movement is performed by providing the cam groove so that the difference between the respective movement amounts has a desired relative movement relationship. It is also possible to control the group.
【００４０】図１６に示す第８の実施例では、棒状ヘリ
コイド６のオスヘリコイドに噛合うメスヘリコイド５に
対し、主レンズ移動鏡筒６２の連結部材６２ｃが係合
し、また鏡筒６２に設けられた回転部材６２ａが固定筒
６１の直進溝６１ａに係合し、主レンズ移動鏡筒６２を
光軸に沿って直進移動させる。また、従レンズ移動鏡筒
６３はヘリコイド６と一体に形成された平歯車６ａと噛
合する歯車６３ｂを有していて、鏡筒６３に設けられた
回転部材６３ａが固定筒６１のカム溝６１ｂに係合す
る。In the eighth embodiment shown in FIG. 16, the connecting member 62c of the main lens moving lens barrel 62 engages with the female helicoid 5 that meshes with the male helicoid of the rod-shaped helicoid 6 and is provided on the lens barrel 62. The rotating member 62a thus engaged engages with the straight-moving groove 61a of the fixed barrel 61 to move the main-lens moving lens barrel 62 straightly along the optical axis. The secondary lens moving lens barrel 63 has a gear 63b that meshes with a spur gear 6a formed integrally with the helicoid 6, and the rotating member 63a provided on the lens barrel 63 is provided in the cam groove 61b of the fixed barrel 61. Engage.
【００４１】したがって、本実施例の構成では、ヘリコ
イド６の回転力が鏡筒６２と鏡筒６３に別々に伝達さ
れ、鏡筒６３は鏡筒６２の回動力を伝達されることなく
駆動される。Therefore, in the structure of this embodiment, the rotational force of the helicoid 6 is transmitted to the lens barrel 62 and the lens barrel 63 separately, and the lens barrel 63 is driven without transmitting the turning force of the lens barrel 62. .
【００４２】なお、図１７に示す第９の実施例のよう
に、固定筒７１の直進溝７１ａに鏡筒６２の回転部材６
２ａを係合させ、ヘリコイド６により鏡筒６２を光軸に
沿って直進移動させると共に、歯車６ａと７３ｂとの噛
合により鏡筒６３を回転させるのは、図１６の第８の実
施例と同様とし、逆に固定筒７１に形成した固定ピン７
１ｂを鏡筒７３に形成したカム溝２３ａに係合させるよ
うにしてもよい。As in the ninth embodiment shown in FIG. 17, the rotating member 6 of the lens barrel 62 is inserted into the straight groove 71a of the fixed barrel 71.
Similar to the eighth embodiment shown in FIG. 16, 2a is engaged with the helicoid 6 to move the lens barrel 62 straight along the optical axis and the gear barrels 6a and 73b are rotated to rotate the lens barrel 63. On the contrary, the fixing pin 7 formed on the fixed cylinder 71
1b may be engaged with the cam groove 23a formed in the lens barrel 73.
【００４３】図１８に示す第１０の実施例は、固定筒８
１にヘリコイド８１ａと鏡筒８２のヘリコイド８２ａと
のヘリコイド結合により鏡筒８２が回転しながら光軸に
沿って移動するのは図１４に示す実施例と同様である
が、逆に固定筒８１に設けたカム溝１ｂと鏡筒８２に形
成した直進溝８２ｂに、鏡筒１３に設けた回転部材１３
ａ，１３ｂを夫々係合させるようにしてもよい。The tenth embodiment shown in FIG. 18 is a fixed cylinder 8
In FIG. 1, the helicoid 81a and the helicoid 82a of the lens barrel 82 move the lens barrel 82 along the optical axis while rotating, as in the embodiment shown in FIG. The rotating member 13 provided on the lens barrel 13 is provided in the provided cam groove 1b and the straight advance groove 82b formed on the lens barrel 82.
The a and 13b may be engaged with each other.
【００４４】図１９に示す第１１の実施例では、鏡筒９
２に形成したメスヘリコイド９２ａが固定筒９１に形成
したオスヘリコイド９１ａに結合して主フォーカス移動
レンズ群Ｍを回転させながら光軸に沿って移動させるの
は図１５に示す実施例と同様であるが、鏡筒９２に直進
溝９２ｂを形成すると共に、固定筒９１にカム溝９１ｂ
を形成し、鏡筒１３の回転部材１３ａ，１３ｂをカム溝
９１ｂと直進溝９２ｂに係合させるようにしてもよい。In the eleventh embodiment shown in FIG. 19, the lens barrel 9 is used.
Similar to the embodiment shown in FIG. 15, the female helicoid 92a formed in 2 is coupled to the male helicoid 91a formed in the fixed barrel 91 and moved along the optical axis while rotating the main focus moving lens group M. However, the straight groove 92b is formed in the lens barrel 92, and the cam groove 91b is formed in the fixed barrel 91.
May be formed to engage the rotating members 13a and 13b of the lens barrel 13 with the cam groove 91b and the rectilinear groove 92b.
【００４５】[0045]
【発明の効果】本発明によれば、以下のような効果が得
られる。According to the present invention, the following effects can be obtained.
【００４６】請求項１に記載した発明によれば、第１の
移動レンズ群を移動させると、第２の移動レンズ群が第
１の移動レンズ群の駆動力を受けて従動駆動されるの
で、第１および第２の移動レンズ群の駆動手段のコンパ
クト化が図れる。According to the first aspect of the invention, when the first moving lens group is moved, the second moving lens group is driven by the driving force of the first moving lens group. The drive means for the first and second moving lens groups can be made compact.
【００４７】請求項２に記載した発明によれば、第１の
移動レンズ群と第２の移動レンズ群とは別々に駆動され
て両レンズ群の相対的距離が変更されるが、駆動方式が
異なるため、第１の移動レンズ群と第２の移動レンズ群
とを光学的収差変動を抑制するような高次関数的相対移
動を行わせることができ、また、一方のレンズ群を他方
のレンズ群に対して微調整させることができ、さらに大
きな駆動トルクも得ることができ、従来のレンズの操作
性を損なうことがない。According to the second aspect of the invention, the first moving lens group and the second moving lens group are driven separately to change the relative distance between the two lens groups. Since they are different from each other, it is possible to cause the first moving lens group and the second moving lens group to perform a high-order functional relative movement that suppresses optical aberration fluctuation, and also to make one lens group the other lens. It is possible to make fine adjustments to the group, obtain a larger driving torque, and do not impair the operability of the conventional lens.
【００４８】請求項３に記載した発明によれば、第１の
レンズ群に対して、カム駆動される第２のレンズ群の調
整性を異ならせることができるので、請求項２の場合と
同様な効果が得られる。According to the third aspect of the present invention, the adjustability of the cam-driven second lens group can be made different from that of the first lens group. Therefore, the same as in the case of the second aspect. Can be obtained.
【００４９】請求項４に記載の発明によれば、第１の移
動レンズ群をヘリコイド結合により回転駆動する機構が
使用でき、請求項５に記載の発明によれば、第１の移動
レンズ群を直進溝とカム溝を用いたカム機構により直進
移動させる機構が使用することができる。According to the invention of claim 4, a mechanism for rotationally driving the first moving lens group by helicoid coupling can be used, and according to the invention of claim 5, the first moving lens group is A mechanism that moves straight by a cam mechanism using a straight groove and a cam groove can be used.
【図１】本発明の第１の実施例を示し、（ａ）は側断面
図、（ｂ）は図１のカム環の展開図、（ｃ）は移動量の
関数とカム溝の関係を示す図。1A and 1B show a first embodiment of the present invention, in which FIG. 1A is a side sectional view, FIG. 1B is a development view of a cam ring in FIG. 1, and FIG. 1C is a relationship between a function of a movement amount and a cam groove. FIG.
【図２】図１のＡ−Ａ線断面図。FIG. 2 is a sectional view taken along line AA of FIG.
【図３】図１のＢ−Ｂ線断面図。FIG. 3 is a sectional view taken along line BB of FIG.
【図４】第１の実施例の動作の始点状態を示し、（ａ）
は断面図、（ｂ）はカム間の展開図を示す。FIG. 4 shows a starting point state of the operation of the first embodiment, (a)
Shows a cross-sectional view, and (b) shows a development view between the cams.
【図５】第１の実施例の動作の中点状態を示し、（ａ）
は断面図、（ｂ）はカム間の展開図を示す。FIG. 5 shows the midpoint state of the operation of the first embodiment, (a)
Shows a cross-sectional view, and (b) shows a development view between the cams.
【図６】第１の実施例の動作の終点状態を示し、（ａ）
は断面図、（ｂ）はカム間の展開図を示す。FIG. 6 shows an end state of the operation of the first embodiment, (a)
Is a cross-sectional view, and FIG.
【図７】（ａ）、（ｂ）、ｃはそれぞれ移動量の関数と
カム溝の関係を示す図。7A, 7B, and 7C are diagrams showing the relationship between the function of the movement amount and the cam groove, respectively.
【図８】第２の実施例を示す断面図。FIG. 8 is a sectional view showing a second embodiment.
【図９】第３の実施例を示し、（ａ）は側断面図、
（ｂ）はカム環の展開図。FIG. 9 shows a third embodiment, (a) is a side sectional view,
(B) is a development view of the cam ring.
【図１０】図９のＣ−Ｃ線断面図。FIG. 10 is a sectional view taken along line CC of FIG.
【図１１】図９のＤ−Ｄ線断面図。11 is a cross-sectional view taken along the line DD of FIG.
【図１２】第４の実施例を示す断面図。FIG. 12 is a sectional view showing a fourth embodiment.
【図１３】第５の実施例を示す断面図。FIG. 13 is a sectional view showing a fifth embodiment.
【図１４】第６の実施例を示す断面図。FIG. 14 is a sectional view showing a sixth embodiment.
【図１５】第７の実施例を示す断面図。FIG. 15 is a sectional view showing a seventh embodiment.
【図１６】第８の実施例を示す断面図。FIG. 16 is a sectional view showing an eighth embodiment.
【図１７】第９の実施例を示す断面図。FIG. 17 is a sectional view showing a ninth embodiment.
【図１８】第１０の実施例を示す断面図。FIG. 18 is a sectional view showing a tenth embodiment.
【図１９】第１１の実施例を示す断面図。FIG. 19 is a sectional view showing an eleventh embodiment.
【図２０】従来のレンズ鏡筒の断面図。FIG. 20 is a sectional view of a conventional lens barrel.
【図２１】図２０のＫ−Ｋ線断面図。21 is a sectional view taken along line KK of FIG.
【図２２】従来の他のレンズ鏡筒の断面図。FIG. 22 is a sectional view of another conventional lens barrel.
【図２３】図２２のＬ−Ｌ線断面図。23 is a sectional view taken along line LL in FIG.
Ｍ…主フォーカス移動レンズ群 Ｆ…従フォーカス移動レンズ群 １，１１，４１，５１，６１，７１，８１，９１…フォ
ーカス固定鏡筒 ２，１２，２２，３２，４２，５２，６２，８２，９２
…主フォーカス移動群支持鏡筒 ３，１３，２３，３３，６３，７３…従フォーカス移動
群支持鏡筒 ４，８，１４…カム環 ５，１１ａ，４１ａ，５２ａ，８１ａ，９２ａ…メスヘ
リコイド ６，１２ａ，４２ａ，５１ａ，８２ａ，９１ａ…オスヘ
リコイド ７…ヘリコイド回転支持部材 １ａ，４１ｂ，５１ｂ，６１ａ，７１ａ…光軸に平行な
直線溝 １ｂ，１１ｂ，７１ｂ…固定ピン ２ａ，３ａ，３ｂ，１３ａ，１３ｂ，２２ａ，２３ａ，
３２ａ，３２ｂ，６２ａ，６３ａ…回転部材 ２ｂ，１２ｂ，８２ｂ，９２ｂ…光軸に平行な直線溝 ２ｃ，２２ｃ，３２ｃ，６２ｃ…メスヘリコイド連結部
材 ４ａ，８ａ，１４ａ，２２ｂ，３３ａ，４２ｂ，５２
ｂ，６１ｂ，８１ｂ，９１ｂ…カム溝 ４ｂ…光軸と傾斜した直線溝 １４ｂ…光軸と平行な直線溝 ６ａ…ヘリコイド歯車 ８ｂ，２３ｂ，３３ｂ，６３ｂ，７３ｂ…歯車 ＸM …主フォーカス移動レンズ群の移動量 ＸF …従フォーカス移動レンズ群の静止系での絶対移動
量 ｇ（ＸM ）…従フォーカス移動レンズ群の主フォーカス
レンズ移動群に対する相対移動 θ…カム環の回転量 １０１，１１１…ズーム固定鏡筒 １０１ａ，１０１ｂ，１１１ａ，１１１ｂ…光軸に平行
な直線溝 Ｖ1 ，Ｖ2 …バリエーターレンズ群 １０４ａ，１１４ａ…バリエーターカム溝 Ｃ1 ，Ｃ2 …コニペンセーターレンズ群 １０４ｂ，１１４ｂ…コニペンセーターカム溝 １０２，１１２…バリエーターレンズ群支持鏡筒 １０３，１１３…コニペンセーターレンズ群支持鏡筒 １０４…円柱カム １１４…円筒カム １０５，１１５…カム回転支持部材 １０２ａ，１０２ｂ，１０３ａ，１０３ｂ，１１２ａ，
１１２ｂ，１１３ａ，１１３ｂ…回転部材M ... Primary focus moving lens group F ... Secondary focus moving lens group 1, 11, 41, 51, 61, 71, 81, 91 ... Focus fixed lens barrel 2, 12, 22, 32, 42, 52, 62, 82, 92
... Main focus moving group supporting lens barrel 3,13,23,33,63,73 ... Secondary focus moving group supporting lens barrel 4,8,14 ... Cam ring 5,11a, 41a, 52a, 81a, 92a ... Female helicoid 6 , 12a, 42a, 51a, 82a, 91a ... Male helicoid 7 ... Helicoid rotation support member 1a, 41b, 51b, 61a, 71a ... Straight grooves 1b, 11b, 71b parallel to optical axis ... Fixing pins 2a, 3a, 3b, 13a, 13b, 22a, 23a,
32a, 32b, 62a, 63a ... Rotating members 2b, 12b, 82b, 92b ... Linear grooves 2c, 22c, 32c, 62c parallel to the optical axis ... Female helicoid connecting members 4a, 8a, 14a, 22b, 33a, 42b, 52
b, 61b, 81b, 91b ... cam groove 4b ... linear groove 14b ... optical axis parallel to the linear groove 6a ... helicoid gear 8b that is inclined to the optical axis, 23b, 33b, 63b, 73b ... gear X M ... main focus moving lens Group movement amount X F ... Absolute movement amount of the sub-focus movement lens unit in the stationary system g (X M ) ... Relative movement of sub-focus movement lens unit to main focus lens movement unit θ ... Cam ring rotation amount 101, 111 ... zoom lens barrel 101a, 101b, 111a, 111b ... straight grooves parallel to the optical axis V 1, V 2 ... variator lens group 104a, 114a ... variator cam groove C 1, C 2 ... Koni pen sweater lens group 104b, 114b ... Conipen sweater cam grooves 102, 112 ... Variator lens group supporting lens barrel 103, 113 ... Conipen sweater lens group support Barrel 104 ... cylindrical cam 114 ... cylindrical cam 105, 115 ... cam rotation support member 102a, 102b, 103a, 103b, 112a,
112b, 113a, 113b ... Rotating member
Claims (5)
群とから構成される合焦用レンズ群と、物体距離の変化
により該第１の移動レンズ群と該第２の移動レンズ群と
の相対的な位置関係を変化させるレンズ位置可変手段を
有するレンズ鏡筒において、 該レンズ位置可変手段は、主駆動手段を介して駆動され
る第１の移動レンズ群の駆動力を受けて第２の移動レン
ズ群を移動させる従動駆動手段を有することを特徴とす
るレンズ鏡筒。1. A focusing lens group including a first moving lens group and a second moving lens group, and the first moving lens group and the second moving lens group depending on a change in object distance. In the lens barrel having a lens position changing means for changing the relative positional relationship with the lens position changing means, the lens position changing means receives the driving force of the first moving lens group driven via the main driving means. A lens barrel comprising: a driven unit for moving the second moving lens unit.
群とから構成される合焦用レンズ群と、物体距離の変化
により該第１の移動レンズ群と該第２の移動レンズ群と
の相対的な位置関係を変化させるレンズ位置可変手段を
有するレンズ鏡筒において、 該レンズ位置可変手段は、駆動力を第１の移動レンズ群
に伝達する主駆動手段と、該駆動力を第２の移動レンズ
群に伝達する該主駆動手段と伝達方式の異なる従動駆動
手段を有することを特徴とするレンズ鏡筒。2. A focusing lens group including a first moving lens group and a second moving lens group, and the first moving lens group and the second moving lens group depending on a change in object distance. In the lens barrel having a lens position changing means for changing a relative positional relationship with the lens position changing means, the lens position changing means includes a main driving means for transmitting the driving force to the first moving lens group, and the driving force for the first moving lens group. 2. A lens barrel comprising: a main driving unit that transmits to the second moving lens group and a driven unit that has a different transmission method.
は駆動力を第１の移動レンズ群に伝達するヘリコイドね
じにより構成され、従動駆動手段は従動駆動力を第２の
移動レンズ群に伝達するカム機構で構成されていること
を特徴とするレンズ鏡筒。3. The main drive means according to claim 1 or 2, wherein the main drive means is composed of a helicoid screw for transmitting the drive force to the first movable lens group, and the driven drive means transmits the driven drive force to the second movable lens group. A lens barrel characterized by being configured by a cam mechanism.
段における従動駆動力は第１の移動レンズ群の光軸方向
の移動により与えられることを特徴とするレンズ鏡筒。4. The lens barrel according to claim 1, wherein the driven driving force of the driven driving means is given by movement of the first moving lens unit in the optical axis direction.
段における従動駆動力は第１の移動レンズの光軸の回り
の回転により与えられることを特徴とするレンズ鏡筒。5. The lens barrel according to claim 1, wherein the driven driving force of the driven driving means is given by rotation of the first moving lens about the optical axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08166194A JP3412905B2 (en) | 1994-04-20 | 1994-04-20 | Lens barrel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08166194A JP3412905B2 (en) | 1994-04-20 | 1994-04-20 | Lens barrel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07287156A true JPH07287156A (en) | 1995-10-31 |
| JP3412905B2 JP3412905B2 (en) | 2003-06-03 |
Family
ID=13752517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08166194A Expired - Fee Related JP3412905B2 (en) | 1994-04-20 | 1994-04-20 | Lens barrel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3412905B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1647850A1 (en) * | 2004-10-14 | 2006-04-19 | Canon Kabushiki Kaisha | Zoom optical system with speed-changing mechanism |
| JP2011164156A (en) * | 2010-02-05 | 2011-08-25 | Ricoh Co Ltd | Lens barrel, imaging device and hand-held information terminal device |
| US8619161B2 (en) | 2008-09-10 | 2013-12-31 | Panasonic Corporation | Lens barrel and imaging device |
| US10845564B2 (en) | 2017-08-31 | 2020-11-24 | Canon Kabushiki Kaisha | Lens apparatus and image pickup apparatus |
-
1994
- 1994-04-20 JP JP08166194A patent/JP3412905B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1647850A1 (en) * | 2004-10-14 | 2006-04-19 | Canon Kabushiki Kaisha | Zoom optical system with speed-changing mechanism |
| US8619161B2 (en) | 2008-09-10 | 2013-12-31 | Panasonic Corporation | Lens barrel and imaging device |
| JP2011164156A (en) * | 2010-02-05 | 2011-08-25 | Ricoh Co Ltd | Lens barrel, imaging device and hand-held information terminal device |
| US10845564B2 (en) | 2017-08-31 | 2020-11-24 | Canon Kabushiki Kaisha | Lens apparatus and image pickup apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3412905B2 (en) | 2003-06-03 |
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