JP2013088652A - Lens device of optical apparatus - Google Patents

Lens device of optical apparatus Download PDF

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JP2013088652A
JP2013088652A JP2011229724A JP2011229724A JP2013088652A JP 2013088652 A JP2013088652 A JP 2013088652A JP 2011229724 A JP2011229724 A JP 2011229724A JP 2011229724 A JP2011229724 A JP 2011229724A JP 2013088652 A JP2013088652 A JP 2013088652A
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lens
focus adjustment
frame portion
adjustment mechanism
focus
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JP5807252B2 (en
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Keiichi Sakamoto
桂一 坂本
Koji Shiokawa
浩司 塩川
Tomoaki Kitajima
知明 北島
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Cosina Co Ltd
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Cosina Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To construct an adjustment system for quicker adjustment and of high stability and smoothness, which achieves the reduction of costs including both component costs and manufacturing costs and contributes to the reduction in size and weight of an entire device.SOLUTION: A lens group Lf is divided to a front lens portion Lfa and a rear lens portion Lfb located at least in a longitudinal direction, and the front lens portion Lfa and the rear lens portion Lfb are supported so as to be displaceable independently respectively. A focus adjustment mechanism Mf is provided which simultaneously displaces the front lend portion Lfa and the rear lens portion Lfb in a longitudinal direction Fs by operation of a focus adjustment operation part 2 to perform focus adjustment, and an image surface adjustment mechanism Mi is provided which displaces one of the front lens portion Lfa and the rear lens portion Lfb in the longitudinal direction Fs in accordance with the operation of the focus adjustment operation part 2 to perform image surface adjustment.

Description

本発明は、フォーカス調整操作部の操作により所定のレンズ群を前後方向へ変位させてフォーカス調整を行うフォーカス調整機構を備える光学機器のレンズ装置に関する。   The present invention relates to a lens apparatus of an optical apparatus including a focus adjustment mechanism that performs focus adjustment by displacing a predetermined lens group in the front-rear direction by operation of a focus adjustment operation unit.

一般に、光学機器のレンズ装置にはフォーカス調整機構及びズーミング調整機構を備えている。フォーカス調整機構はフォーカス調整操作部の操作により所定のレンズ群を前後方向へ変位させることにより焦点を合わせる機能を有しているが、このようなフォーカス調整機構によるフォーカス調整のみではレンズ装置からの焦点距離によって画像の端が湾曲したりボケる現象を生じるため、これらの現象を解消するには、レンズ群に対して更に緻密な調整、即ち、像面調整を行う場合がある。   In general, a lens device of an optical apparatus includes a focus adjustment mechanism and a zooming adjustment mechanism. The focus adjustment mechanism has a function of focusing by displacing a predetermined lens group in the front-rear direction by operation of the focus adjustment operation unit. However, focus adjustment from the lens apparatus is only performed by focus adjustment by such a focus adjustment mechanism. Since the edge of the image is bent or blurred depending on the distance, in order to eliminate these phenomena, finer adjustment, that is, image plane adjustment may be performed on the lens group.

従来、このような像面調整を行う機能を備えたレンズ装置としては、特許文献１で開示されるレンズ系制御装置を備えたレンズ装置及び特許文献２で開示されるズームレンズ（レンズ装置）が知られている。同文献１に開示されるレンズ系制御装置は、カメラ等に搭載し、変倍レンズ及び像面補正と焦点調整の為のレンズを電子的制御回路で位置制御するとともにで、マニュアルフォーカスモードの際に被写体距離の変化によるボケを防止することを目的とするものであって、構成的には、マニュアルフォーカスモードで、ズーミングの一端から他端へズームしたい場合は、逆の端からもう一端へズーミングしてフォーカスレンズの移動軌跡を記憶しておき、この移動軌跡を逆にたどることで達成するが、フォーカスレンズが記憶された移動軌跡から一定量以上離れた場合は、それ以後、移動軌跡をたどるのを禁止する様にしたものである。また、同文献２に開示されるズームレンズは、カメラ等に搭載し、物体側より正の屈折力の第１レンズ群と、負の屈折力の第２レンズ群と、正の屈折力の第３レンズ群とからなり、広角端から望遠端への変倍に際し、第２レンズ群が物体側から像側へ移動し、第３レンズ群が変倍時の像面補正のために前後に移動し、３倍前後の変倍比を有しながら、歪曲収差が小さく、かつレンズ全長が短いコンパクトなズームレンズの提供を目的とするものであり、構成的には、広角端における全系の焦点距離，第１レンズ群の焦点距離，及び望遠端における第３レンズ群の結像倍率が、所定の条件式を満足するようにしたものである。   Conventionally, as a lens apparatus having a function of performing such image surface adjustment, a lens apparatus provided with a lens system control apparatus disclosed in Patent Document 1 and a zoom lens (lens apparatus) disclosed in Patent Document 2 are disclosed. Are known. The lens system control device disclosed in the document 1 is mounted on a camera or the like, and controls the position of a zoom lens and a lens for image plane correction and focus adjustment with an electronic control circuit, and in the manual focus mode. If you want to zoom from one end of zooming to the other end in manual focus mode, you can zoom from the opposite end to the other end. This is achieved by memorizing the movement locus of the focus lens and tracing this movement locus in reverse, but if the focus lens moves away from the memorized movement locus by a certain amount or more, the movement locus is followed thereafter. It is intended to be prohibited. The zoom lens disclosed in the document 2 is mounted on a camera or the like, and has a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a first lens having a positive refractive power from the object side. Consists of three lens groups. When zooming from the wide-angle end to the telephoto end, the second lens group moves from the object side to the image side, and the third lens group moves back and forth to correct the image plane during zooming. The objective of the present invention is to provide a compact zoom lens having a zoom ratio of about 3 times, a small distortion aberration, and a short overall lens length. The distance, the focal length of the first lens group, and the imaging magnification of the third lens group at the telephoto end satisfy a predetermined conditional expression.

特開平５−１３４１６６号公報Japanese Patent Laid-Open No. 5-134166 特開平９−２３６７４８号公報JP-A-9-236748

しかし、上述した従来のレンズ装置（レンズ系制御装置，ズームレンズ）は、次のような問題点があった。   However, the above-described conventional lens device (lens system control device, zoom lens) has the following problems.

第一に、像面調整系は、フォーカス調整系に対して独立した調整系として構成するとともに、駆動モータ及び運動変換機構等を含む電気駆動系によりレンズを変位させる構成を採用するため、部品点数及び組立工数が増加するとともに、これに伴って全体構造も複雑化（煩雑化）する。したがって、部品コスト及び製造コストの双方を含む大幅なコストアップを招くとともに、レンズ装置全体の大型化及び重量アップを招く。   First, the image plane adjustment system is configured as an adjustment system independent of the focus adjustment system and adopts a configuration in which the lens is displaced by an electric drive system including a drive motor and a motion conversion mechanism. As the number of assembly steps increases, the overall structure becomes complicated (complex). Therefore, a significant cost increase including both the component cost and the manufacturing cost is caused, and the entire lens device is increased in size and weight.

第二に、像面調整系は、独立した電気駆動系により構成、即ち、像面調整に係わる調整量（補正量）を演算処理により求め、求めた調整量に係わる制御量を駆動モータに供給してレンズを変位させるため、調整が終了するまでの時間が長くなり、応答性に難がある。しかも、基本的にはフォーカス調整系とは同期せず、フォーカス調整と像面調整はそれぞれ独立して行われる。したがって、安定性及び円滑性を確保する観点からも必ずしも十分であるとは言えない。   Second, the image plane adjustment system is constituted by an independent electric drive system, that is, an adjustment amount (correction amount) related to image plane adjustment is obtained by arithmetic processing, and a control amount related to the obtained adjustment amount is supplied to the drive motor. Then, since the lens is displaced, the time until the adjustment is completed becomes long and the response is difficult. In addition, basically, the focus adjustment and the image plane adjustment are performed independently without being synchronized with the focus adjustment system. Therefore, it cannot always be said that it is sufficient from the viewpoint of ensuring stability and smoothness.

本発明は、このような背景技術に存在する課題を解決した光学機器のレンズ装置の提供を目的とするものである。   An object of the present invention is to provide a lens device for an optical apparatus that solves the problems existing in the background art.

本発明に係る光学機器Ｐのレンズ装置１は、上述した課題を解決するため、少なくともフォーカス調整操作部２の操作により所定のレンズ群Ｌｆを前後方向Ｆｓへ変位させてフォーカス調整を行うフォーカス調整機構を備えてなるレンズ装置を構成するに際して、レンズ群Ｌｆを少なくとも前後に位置する前側レンズ部Ｌｆａと後側レンズ部Ｌｆｂに分け、前側レンズ部Ｌｆａと後側レンズ部Ｌｆｂをそれぞれ独立して変位可能に支持するとともに、フォーカス調整操作部２の操作により、前側レンズ部Ｌｆａと後側レンズ部Ｌｆｂを同時に前後方向Ｆｓへ変位させてフォーカス調整を行うフォーカス調整機構Ｍｆを備えるとともに、前側レンズ部Ｌｆａ又は後側レンズ部Ｌｆｂの一方をフォーカス調整操作部２の操作に連動させ、前後方向Ｆｓへ変位させることにより像面調整を行う像面調整機構Ｍｉを備えてなることを特徴とする。   In order to solve the above-described problem, the lens apparatus 1 of the optical device P according to the present invention performs focus adjustment by displacing the predetermined lens group Lf in the front-rear direction Fs by at least the operation of the focus adjustment operation unit 2. When the lens apparatus is provided, the lens unit Lf is divided into at least a front lens portion Lfa and a rear lens portion Lfb positioned at the front and rear, and the front lens portion Lfa and the rear lens portion Lfb can be independently displaced. And a focus adjustment mechanism Mf for adjusting the focus by displacing the front lens portion Lfa and the rear lens portion Lfb in the front-rear direction Fs simultaneously by the operation of the focus adjustment operation portion 2, and the front lens portion Lfa or One of the rear lens portions Lfb is linked to the operation of the focus adjustment operation unit 2 to And characterized in that it comprises an image plane adjustment mechanism Mi performing image surface adjustment by displacing the s.

この場合、発明の好適な態様により、フォーカス調整操作部２には、電動又は手動により回動操作可能なフォーカスリング２ｒを適用できる。また、フォーカス調整機構Ｍｆは、フォーカス調整操作部２の操作により回動する中間筒３と、この中間筒３に対して、前後方向Ｆｓの変位が許容され、かつ回動方向Ｆｒの変位が規制されるとともに 後側レンズ部Ｌｆｂを支持し、かつ少なくとも回動方向Ｆｒが規制された支持枠部４に対して同軸上に螺合させた後側枠部５とを備えて構成できる。さらに、像面調整機構Ｍｉは、固定された外筒６に対して、前後方向Ｆｓの変位が許容され、かつ回動方向Ｆｒの変位が規制されるとともに、前側レンズ部Ｌｆａを支持し、かつ後側枠部５に対して同軸上に螺合させた前側枠部７とを備えて構成できる。この像面調整機構Ｍｉは、後側レンズ部Ｌｆｂを前方Ｆｓｆへ変位させた際に、前側レンズ部Ｌｆａを前方Ｆｓｆへ変位させてもよいし、前側レンズ部Ｌｆａを後方Ｆｓｒへ変位させてもよい。なお、光学機器Ｐとしては、プロジェクタＰｏに適用することが望ましい。   In this case, according to a preferred aspect of the invention, the focus adjustment operation unit 2 can be applied with a focus ring 2r that can be operated electrically or manually. Further, the focus adjustment mechanism Mf allows the intermediate cylinder 3 to be rotated by the operation of the focus adjustment operation unit 2 and the displacement in the front-rear direction Fs with respect to the intermediate cylinder 3 and the displacement in the rotation direction Fr to be regulated. In addition, the rear lens portion Lfb is supported, and at least the rear frame portion 5 that is coaxially screwed with the support frame portion 4 whose rotational direction Fr is restricted can be configured. Further, the image plane adjustment mechanism Mi is allowed to displace in the front-rear direction Fs with respect to the fixed outer cylinder 6 and is restricted from displacement in the rotation direction Fr, and supports the front lens portion Lfa. A front frame portion 7 screwed coaxially with the rear frame portion 5 can be provided. This image plane adjustment mechanism Mi may displace the front lens portion Lfa to the front Fsf or the front lens portion Lfa to the rear Fsr when the rear lens portion Lfb is displaced to the front Fsf. Good. The optical device P is preferably applied to the projector Po.

このような構成を有する本発明に係る光学機器Ｐのレンズ装置１によれば、次のような顕著な効果を奏する。   According to the lens apparatus 1 of the optical apparatus P according to the present invention having such a configuration, the following remarkable effects can be obtained.

（１） 前側レンズ部Ｌｆａ又は後側レンズ部Ｌｆｂの一方をフォーカス調整操作部２の操作に連動させ、前後方向Ｆｓへ変位させることにより像面調整を行う像面調整機構Ｍｉを設けたため、駆動モータ及び運動変換機構等を含む電気駆動系によりレンズを変位させる等の独立した像面調整系が不要になり、部品点数及び組立工数の削減、更には全体構成の簡略化（単純化）を図ることができる。したがって、部品コスト及び製造コストの双方を含む大幅なコストダウンを実現できるとともに、レンズ装置１全体の小型化及び軽量化にも寄与できる。   (1) Since the image plane adjustment mechanism Mi that adjusts the image plane by linking one of the front lens portion Lfa and the rear lens portion Lfb with the operation of the focus adjustment operation unit 2 and displacing it in the front-rear direction Fs is provided. An independent image plane adjustment system such as displacing the lens by an electric drive system including a motor and a motion conversion mechanism becomes unnecessary, reducing the number of parts and the number of assembly steps, and further simplifying (simplifying) the overall configuration. be able to. Therefore, it is possible to realize a significant cost reduction including both the component cost and the manufacturing cost, and to contribute to the reduction in size and weight of the entire lens apparatus 1.

（２） フォーカス調整操作部２の操作は、フォーカス調整機構Ｍｆと像面調整機構Ｍｉの双方に対して、同時に、かつダイレクトに伝達されるため、フォーカス調整と像面調整の双方の調整、即ち、前側レンズ部Ｌｆａと後側レンズ部Ｌｆｂの変位のタイミングを常に同期させことができる。したがって、像面調整の遅延を解消し、応答性を高めることができ、フォーカス調整及び像面調整の双方に対する高速化を図れるとともに、安定性及び円滑性の高い調整系を構築できる。   (2) Since the operation of the focus adjustment operation unit 2 is transmitted simultaneously and directly to both the focus adjustment mechanism Mf and the image plane adjustment mechanism Mi, both the focus adjustment and the image plane adjustment are performed. The displacement timings of the front lens portion Lfa and the rear lens portion Lfb can always be synchronized. Therefore, the delay of image plane adjustment can be eliminated and the responsiveness can be improved, and the speed of both focus adjustment and image plane adjustment can be increased, and an adjustment system with high stability and smoothness can be constructed.

（３） 好適な態様により、フォーカス調整機構Ｍｆを、フォーカス調整操作部２の操作により回動する中間筒３と、この中間筒３に対して、前後方向Ｆｓの変位が許容され、かつ回動方向Ｆｒの変位が規制されるとともに 後側レンズ部Ｌｆｂを支持し、かつ少なくとも回動方向Ｆｒが規制された支持枠部４に対して同軸上に螺合させた後側枠部５とを備えて構成すれば、汎用的なフォーカス調整機構Ｍｆをそのまま利用又は僅かな変更を加えて利用できるため、更なる小型軽量化及び低コスト化に寄与できる。   (3) According to a preferred embodiment, the focus adjustment mechanism Mf is rotated by the operation of the focus adjustment operation unit 2, and the displacement in the front-rear direction Fs is allowed with respect to the intermediate cylinder 3 and the rotation is allowed. And a rear frame portion 5 that supports the rear lens portion Lfb while being restricted in displacement in the direction Fr and is screwed coaxially with the support frame portion 4 that is restricted in at least the rotation direction Fr. If configured, the general-purpose focus adjustment mechanism Mf can be used as it is or with a slight change, which can contribute to further reduction in size and weight and cost.

（４） 好適な態様により、像面調整機構Ｍｉを、固定された外筒６に対して、前後方向Ｆｓの変位が許容され、かつ回動方向Ｆｒの変位が規制されるとともに、前側レンズ部Ｌｆａを支持し、かつ後側枠部５に対して同軸上に螺合させた前側枠部７とを備えて構成すれば、既設のフォーカス調整機構Ｍｆの一部を僅かに変更して実施できるため、実施の容易化、更には小型軽量化及び低コスト化を図る観点からも最も望ましい形態として実現できる。   (4) According to a preferred embodiment, the image plane adjusting mechanism Mi is allowed to be displaced in the front-rear direction Fs and restricted in the rotational direction Fr relative to the fixed outer cylinder 6, and the front lens unit. If the front frame portion 7 that supports Lfa and is coaxially screwed with the rear frame portion 5 is provided, a part of the existing focus adjustment mechanism Mf can be slightly changed. Therefore, it can be realized as the most desirable form from the viewpoint of facilitating implementation, further reducing the size and weight, and reducing the cost.

（５） 好適な態様により、像面調整機構Ｍｉを、後側レンズ部Ｌｆｂを前方Ｆｓｆへ変位させた際に、前側レンズ部Ｌｆａを前方Ｆｓｆへ変位させ、又は前側レンズ部Ｌｆａを後方Ｆｓｒへ変位させるように構成すれば、様々な異なるレンズ群構成に対応させることができる。しかも、必要に応じて周辺にボケを生じさせるなどの特殊効果を演出する特殊な光学機器としても構築できるなど、多様性及び多機能性に優れる。   (5) According to a preferred aspect, when the image plane adjustment mechanism Mi displaces the rear lens portion Lfb to the front Fsf, the front lens portion Lfa is displaced to the front Fsf, or the front lens portion Lfa is moved to the rear Fsr. If it is configured to be displaced, it can correspond to various different lens group configurations. Moreover, it can be constructed as a special optical device that produces a special effect such as generating blur around the periphery as necessary, and is excellent in diversity and multifunctionality.

（６） 好適な態様により、光学機器Ｐとして、プロジェクタＰｏに適用して最適となる。即ち、プロジェクタＰｏの場合、スクリーンに投影される画面サイズが大きく、画像の一部に生じる湾曲やボケが目立ちやすいため、この課題を有効に解消する観点からもプロジェクタＰｏに適用して最適となる。   (6) According to a preferred embodiment, the optical device P is optimally applied to the projector Po. That is, in the case of the projector Po, the screen size projected on the screen is large, and the curvature and blurring generated in a part of the image are easily noticeable. Therefore, the projector Po is optimally applied to the projector Po from the viewpoint of effectively eliminating this problem. .

本発明の好適実施形態に係るレンズ装置の前側一部を示す断面側面図、Sectional side view which shows the front side part of the lens apparatus which concerns on suitable embodiment of this invention, 同レンズ装置における要部を抽出した拡大断面側面図、An enlarged cross-sectional side view of the main part extracted from the lens device, 同レンズ装置における一部を抽出した拡大断面正面図、An enlarged cross-sectional front view extracting a part of the lens device, 同レンズ装置の全体を示す外観平面図、External plan view showing the entire lens device, 同レンズ装置の像面調整機構におけるスクリーンまでの距離に対する前側レンズ部の変位特性図、Displacement characteristic diagram of the front lens unit with respect to the distance to the screen in the image plane adjustment mechanism of the lens device, 同レンズ装置のフォーカス調整機構と像面調整機構の作用説明図、Operation explanatory diagram of the focus adjustment mechanism and the image plane adjustment mechanism of the lens device, 本発明の変更実施形態に係るレンズ装置のフォーカス調整機構と像面調整機構の作用説明図、Explanatory drawing of an effect | action of the focus adjustment mechanism and image surface adjustment mechanism of the lens apparatus which concerns on the modified embodiment of this invention,

次に、本発明に係る好適実施形態を挙げ、図面に基づき詳細に説明する。   Next, preferred embodiments according to the present invention will be given and described in detail with reference to the drawings.

まず、本実施形態に係るレンズ装置１の構成について、図１〜図４を参照して具体的に説明する。   First, the configuration of the lens apparatus 1 according to the present embodiment will be specifically described with reference to FIGS.

図４に、レンズ装置１の全体の外観構成を示す。例示のレンズ装置１はプロジェクタＰｏ（光学機器Ｐ）用であり、レンズ鏡筒を構成する固定筒部１１の外周面１１ｆに設けたフランジ部１２，１２によりプロジェクタＰｏの内部に取付けることができる。これにより、レンズ装置１の前端側は、プロジェクタＰｏのフロントパネルＰｏｆから前方へ突出する。また、固定筒部１１の外周面１１ｆには、フォーカスリング２ｒとズームリング１３を回動可能に装着する。フォーカスリング２ｒとズームリング１３は、外周の全周にわたって形成した動ギア２ｒｇ，１３ｇをそれぞれ有する。一方、固定筒部１１の左右に位置する外周面１１ｆには、駆動モータを含む回転駆動部１４，１５を取付けるとともに、各回転駆動部１４，１５の出力軸に取付けた駆動ギア１４ｇ，１５ｇは、各被動ギア２ｒｇ，１３ｇにそれぞれ噛合させる。   FIG. 4 shows an overall appearance configuration of the lens apparatus 1. The illustrated lens apparatus 1 is for a projector Po (optical apparatus P), and can be attached to the inside of the projector Po by flange portions 12 and 12 provided on the outer peripheral surface 11f of the fixed cylinder portion 11 constituting the lens barrel. Thereby, the front end side of the lens device 1 protrudes forward from the front panel Pof of the projector Po. Further, the focus ring 2r and the zoom ring 13 are rotatably mounted on the outer peripheral surface 11f of the fixed cylinder portion 11. The focus ring 2r and the zoom ring 13 have dynamic gears 2rg and 13g formed over the entire outer circumference. On the other hand, on the outer peripheral surface 11f located on the left and right of the fixed cylinder portion 11, rotational drive portions 14 and 15 including a drive motor are attached, and drive gears 14g and 15g attached to the output shafts of the rotary drive portions 14 and 15 are The driven gears 2rg and 13g are meshed with each other.

この場合、フォーカスリング２ｒはフォーカス調整操作部２を構成する。なお、例示のフォーカスリング２ｒは回転駆動部１４により回動操作される電動方式であるが、フォーカスリング２ｒを手で回動操作する手動方式により構成することも可能である。このように、フォーカス調整操作部２として、公知のフォーカスリング２ｒを適用すれば、フォーカスリング２ｒは、電動又は手動のいずれの方式であっても回動操作できる。図４中、６は固定筒部１１の前端に一体に結合し、フォーカスリング２ｒの前方に突出する固定された外筒を示す。   In this case, the focus ring 2r constitutes the focus adjustment operation unit 2. Although the illustrated focus ring 2r is an electric system that is rotated by the rotation drive unit 14, it can also be configured by a manual system that rotates the focus ring 2r by hand. As described above, when a known focus ring 2r is applied as the focus adjustment operation unit 2, the focus ring 2r can be rotated by any of an electric system and a manual system. In FIG. 4, reference numeral 6 denotes a fixed outer cylinder that is integrally coupled to the front end of the fixed cylinder portion 11 and projects forward of the focus ring 2r.

一方、図１は、レンズ装置１の前側一部の内部構造を示す。レンズ装置１の前側には、五枚のレンズＬ１〜Ｌ５から構成されるレンズ群Ｌｆを備える。この場合、レンズ群Ｌｆは、前側に位置する二枚のレンズＬ１及びＬ２を含む前側レンズ部Ｌｆａと、後側に位置する三枚のレンズＬ３，Ｌ４及びＬ５を含む後側レンズ部Ｌｆｂに分けるとともに、前側レンズ部Ｌｆａは前側枠部７により支持し、かつ後側レンズ部Ｌｆｂは後側枠部５により支持する。これにより、前側レンズ部Ｌｆａと後側レンズ部Ｌｆｂはそれぞれ独立して変位可能となる。   On the other hand, FIG. 1 shows the internal structure of a part of the front side of the lens device 1. On the front side of the lens device 1, a lens group Lf including five lenses L1 to L5 is provided. In this case, the lens group Lf is divided into a front lens portion Lfa including two lenses L1 and L2 positioned on the front side and a rear lens portion Lfb including three lenses L3, L4 and L5 positioned on the rear side. At the same time, the front lens portion Lfa is supported by the front frame portion 7, and the rear lens portion Lfb is supported by the rear frame portion 5. As a result, the front lens portion Lfa and the rear lens portion Lfb can be independently displaced.

また、レンズ装置１の前側には、フォーカス調整機構Ｍｆと像面調整機構Ｍｉを備える。フォーカス調整機構Ｍｆは、上述したフォーカスリング２ｒの回動操作により回動変位する中間筒３を備える。この場合、図１及び図３に示すように、中間筒３は外筒６の内側に配するため、外筒６には周方向に沿った複数のガイド孔２１…を、周方向に沿って等間隔に形成し、このガイド孔２１…に挿通させた複数の係合子２２…により、フォーカスリング２ｒと中間筒３間を連結する。これにより、中間筒３及びフォーカスリング２ｒは、前後方向Ｆｓの変位が規制され、かつ回動方向Ｆｒに対する一体変位が許容される。   In addition, the front side of the lens apparatus 1 includes a focus adjustment mechanism Mf and an image plane adjustment mechanism Mi. The focus adjustment mechanism Mf includes an intermediate cylinder 3 that is rotated and displaced by the rotation operation of the focus ring 2r described above. In this case, as shown in FIGS. 1 and 3, since the intermediate cylinder 3 is arranged inside the outer cylinder 6, the outer cylinder 6 is provided with a plurality of guide holes 21 along the circumferential direction along the circumferential direction. The focus ring 2r and the intermediate cylinder 3 are connected by a plurality of engagement elements 22 formed at equal intervals and inserted through the guide holes 21. As a result, the intermediate cylinder 3 and the focus ring 2r are restricted from being displaced in the front-rear direction Fs, and are allowed to be integrally displaced in the rotational direction Fr.

さらに、フォーカス調整機構Ｍｆは、中間筒３に対して、前後方向Ｆｓの変位が許容され、かつ回動方向Ｆｒの変位が規制されるとともに、支持枠部４に対して同軸上に螺合させた後側枠部５を備えて構成する。この場合、後側枠部５の外周面後部に設けた雄ネジ部（ヘリコイドネジ部）５ｓを、支持枠部４の内周面前部に設けた雌ネジ部（ヘリコイドネジ部）４ｎに螺合させる。なお、支持枠部４は、この支持枠部４の後方に配する不図示のズーム調整機構により変位するが、後側枠部５側から見た場合には、少なくとも回動方向Ｆｒが規制されている。また、後側枠部５の前部には、大径の係合枠部５ｃを一体形成するとともに、この係合枠部５ｃの外周面後部に複数の係合子２３…を設け、各係合子２３…を中間筒３の軸方向に形成した複数のガイド孔２４…にそれぞれ係合させる。各係合子２３…は、係合枠部５ｃの外周面後部から放射方向に突出し、かつ周方向に沿って等間隔に配される。これにより、後側枠部５は、中間筒３に対して、前後方向Ｆｓの変位が許容され、かつ回動方向Ｆｒの変位が規制される。   Further, the focus adjustment mechanism Mf is allowed to be displaced in the front-rear direction Fs with respect to the intermediate cylinder 3 and restricted in the rotation direction Fr, and is screwed coaxially with the support frame portion 4. A rear frame portion 5 is provided. In this case, the male screw portion (helicoid screw portion) 5s provided at the rear portion of the outer peripheral surface of the rear frame portion 5 is screwed into the female screw portion (helicoid screw portion) 4n provided at the front portion of the inner peripheral surface of the support frame portion 4. Let The support frame portion 4 is displaced by a zoom adjustment mechanism (not shown) disposed behind the support frame portion 4, but when viewed from the rear frame portion 5 side, at least the rotation direction Fr is restricted. ing. In addition, a large-diameter engagement frame portion 5c is integrally formed at the front portion of the rear frame portion 5, and a plurality of engagement elements 23 are provided at the rear portion of the outer peripheral surface of the engagement frame portion 5c. Are respectively engaged with a plurality of guide holes 24 formed in the axial direction of the intermediate cylinder 3. Each of the engagement elements 23... Protrudes in the radial direction from the rear part of the outer peripheral surface of the engagement frame part 5c, and is arranged at equal intervals along the circumferential direction. Accordingly, the rear frame portion 5 is allowed to be displaced in the front-rear direction Fs with respect to the intermediate cylinder 3 and is restricted from being displaced in the rotational direction Fr.

このように、フォーカス調整機構Ｍｆを、フォーカス調整操作部２の操作により回動する中間筒３と、この中間筒３に対して、前後方向Ｆｓの変位が許容され、かつ回動方向Ｆｒの変位が規制されるとともに 後側レンズ部Ｌｆｂを支持し、かつ少なくとも回動方向Ｆｒが規制された支持枠部４に対して同軸上に螺合させた後側枠部５とを備えて構成すれば、汎用的なフォーカス調整機構Ｍｆをそのまま利用又は僅かな変更を加えて利用できるため、小型軽量化及び低コスト化に寄与できる利点がある。   As described above, the intermediate cylinder 3 that rotates the focus adjustment mechanism Mf by the operation of the focus adjustment operation unit 2 and the displacement in the front-rear direction Fs with respect to the intermediate cylinder 3 and the displacement in the rotation direction Fr. And a rear frame portion 5 that supports the rear lens portion Lfb and is screwed coaxially with the support frame portion 4 that is restricted at least in the rotation direction Fr. Since the general-purpose focus adjustment mechanism Mf can be used as it is or with slight changes, there is an advantage that it can contribute to reduction in size and weight and cost.

他方、像面調整機構Ｍｉは、図２に抽出して示すように、外筒６に対して、前後方向Ｆｓの変位が許容され、かつ回動方向Ｆｒの変位が規制されるとともに、前側レンズ部Ｌｆａを支持し、かつ後側枠部５に対して同軸上に螺合させた前側枠部７を備えて構成する。この場合、前側枠部７の外周面後部に設けた雄ネジ部（ヘリコイドネジ部）７ｓを、係合枠部５ｃの内周面前部に設けた雌ネジ部（ヘリコイドネジ部）５ｎに螺合させる。また、前側枠部７の前部には、大径の係合枠部７ｃを一体形成するとともに、この係合枠部７ｃの外周面後部に複数の係合子２５…を設け、各係合子２５…を外筒６の軸方向に形成した複数のガイド孔２６…にそれぞれ係合させる。各係合子２５…は、係合枠部７ｃの外周面後部から放射方向に突出し、かつ周方向に沿って等間隔に配される。これにより、前側枠部７は、外筒６に対して、前後方向Ｆｓの変位が許容され、かつ回動方向Ｆｒの変位が規制される。   On the other hand, the image plane adjustment mechanism Mi, as extracted and shown in FIG. 2, is allowed to be displaced in the front-rear direction Fs with respect to the outer cylinder 6 and restricted in the rotation direction Fr. The front frame portion 7 that supports the portion Lfa and is coaxially screwed with the rear frame portion 5 is provided. In this case, the male screw portion (helicoid screw portion) 7s provided at the rear portion of the outer peripheral surface of the front frame portion 7 is screwed into the female screw portion (helicoid screw portion) 5n provided at the front portion of the inner peripheral surface of the engagement frame portion 5c. Let Further, a large-diameter engagement frame portion 7c is integrally formed at the front portion of the front frame portion 7, and a plurality of engagement elements 25 are provided at the rear portion of the outer peripheral surface of the engagement frame portion 7c. Are respectively engaged with a plurality of guide holes 26 formed in the axial direction of the outer cylinder 6. Each of the engagement elements 25... Protrudes radially from the rear part of the outer peripheral surface of the engagement frame part 7c, and is arranged at equal intervals along the circumferential direction. Accordingly, the front frame portion 7 is allowed to be displaced in the front-rear direction Fs with respect to the outer cylinder 6 and is restricted from being displaced in the rotation direction Fr.

このように、像面調整機構Ｍｉを、固定された外筒６に対して、前後方向Ｆｓの変位が許容され、かつ回動方向Ｆｒの変位が規制されるとともに、前側レンズ部Ｌｆａを支持し、かつ後側枠部５に対して同軸上に螺合させた前側枠部７とを備えて構成すれば、既設のフォーカス調整機構Ｍｆの一部を僅かに変更して実施できるため、実施の容易化、更には小型軽量化及び低コスト化を図る観点からも最も望ましい形態として実現できる。   As described above, the image plane adjustment mechanism Mi is allowed to be displaced in the front-rear direction Fs with respect to the fixed outer cylinder 6 and restricted in the rotation direction Fr, and supports the front lens portion Lfa. In addition, if it is configured to include the front frame portion 7 screwed coaxially with the rear frame portion 5, a part of the existing focus adjustment mechanism Mf can be slightly changed. It can be realized as the most desirable form from the viewpoint of facilitating further reduction in size and weight and cost.

次に、本実施形態に係るレンズ装置１の動作（機能）について、図１〜図６を参照して説明する。   Next, the operation (function) of the lens apparatus 1 according to the present embodiment will be described with reference to FIGS.

今、回転駆動部１４に制御信号（駆動信号）が付与されれば、駆動ギア１４ｇが回転するとともに、被動ギア２ｒｇが回転してフォーカスリング２ｒが電動方式により回動操作される。フォーカスリング２ｒの回動変位は、係合子２２…を介して中間筒３を回動変位させ、さらに、係合子２３…を介して後側枠部５を回動変位させる。後側枠部５は、支持枠部４に対して、ヘリコイドネジ部を介して螺合しているとともに、少なくとも支持枠部４は回動方向Ｆｒの変位が規制されているため、後側枠部５は自身の回動変位量に対応して、前後方向Ｆｓに進退変位する。なお、従来のように、後側枠部５と前側枠部７が一体に形成されている場合には、レンズ群Ｌｆ（レンズＬ１〜Ｌ５）が前後方向Ｆｓに変位し、フォーカス調整（ピント合わせ）のみが行われる。   Now, if a control signal (drive signal) is given to the rotation drive unit 14, the drive gear 14g rotates, the driven gear 2rg rotates, and the focus ring 2r is rotated by an electric system. The rotational displacement of the focus ring 2r causes the intermediate cylinder 3 to be rotationally displaced via the engagement elements 22 ..., and further causes the rear frame 5 to be rotationally displaced via the engagement elements 23 .... The rear frame portion 5 is screwed to the support frame portion 4 via a helicoid screw portion, and at least the support frame portion 4 is restricted from displacement in the rotation direction Fr. The part 5 moves forward and backward in the front-rear direction Fs according to the amount of rotational displacement of itself. When the rear frame portion 5 and the front frame portion 7 are integrally formed as in the prior art, the lens group Lf (lenses L1 to L5) is displaced in the front-rear direction Fs, and focus adjustment (focusing) is performed. Only).

しかし、本実施形態に係るレンズ装置１では、後側枠部５に対して別体に形成し、独立した前側枠部７が、固定された外筒６に対して、前後方向Ｆｓの変位が許容され、かつ回動方向Ｆｒの変位が規制されるとともに、後側枠部５に対して、ヘリコイドネジ部を介して螺合する像面調整機構Ｍｉを備えるため、後側枠部５の回動変位に連動して前側枠部７も前後方向Ｆｓに変位する。この場合、後側枠部５の回動変位量に対して、前側枠部７の変位方向及び変位量が、像面調整（像面補正）されるように、予め、ヘリコイドネジ部を構成する雄ネジ部７ｓ及び雌ネジ部５ｎを設計する。   However, in the lens device 1 according to the present embodiment, the rear frame portion 5 is formed separately and the independent front frame portion 7 is displaced in the front-rear direction Fs with respect to the fixed outer cylinder 6. Since the displacement of the rotation direction Fr is allowed and the image plane adjustment mechanism Mi is screwed into the rear frame portion 5 via the helicoid screw portion, the rotation of the rear frame portion 5 is performed. The front frame portion 7 is also displaced in the front-rear direction Fs in conjunction with the dynamic displacement. In this case, the helicoid screw portion is configured in advance so that the displacement direction and the displacement amount of the front frame portion 7 are subjected to image plane adjustment (image plane correction) with respect to the rotational displacement amount of the rear frame portion 5. The male screw portion 7s and the female screw portion 5n are designed.

例示の場合、図６に示すように、後側枠部５（後側レンズ部Ｌｆｂ）が前方Ｆｓｆへ変位量Ｄｃだけ変位した場合、前側枠部７（前側レンズ部Ｌｆａ）は後方Ｆｓｒへ変位量Ｄｆだけ変位する。この場合、図５に実線で示す特性線Ｑｓように、レンズ装置１からスクリーンまでの距離が長くなるに従って、前側枠部７（前側レンズ部Ｌｆａ）は後方Ｆｓｒへ変位するとともに、レンズ装置１からスクリーンまでの距離が短くなるに従って、前側枠部７（前側レンズ部Ｌｆａ）は前方Ｆｓｆへ変位し、これにより、フォーカス調整機構Ｍｆによりフォーカス調整（ピント合わせ）が行われると同時に、像面調整機構Ｍｉにより像面調整も自動で行われ、焦点距離によって発生する画像の一部の湾曲やボケるなどの現象が解消される。   In the case of illustration, as shown in FIG. 6, when the rear frame portion 5 (rear lens portion Lfb) is displaced to the front Fsf by the displacement amount Dc, the front frame portion 7 (front lens portion Lfa) is displaced to the rear Fsr. Displace by the amount Df. In this case, as the distance from the lens device 1 to the screen increases as the characteristic line Qs indicated by the solid line in FIG. 5, the front frame portion 7 (front lens portion Lfa) is displaced to the rear Fsr and from the lens device 1. As the distance to the screen is shortened, the front frame portion 7 (front lens portion Lfa) is displaced to the front Fsf, whereby focus adjustment (focusing) is performed by the focus adjustment mechanism Mf and at the same time an image plane adjustment mechanism. Image plane adjustment is also automatically performed by Mi, and a phenomenon such as curvature or blurring of a part of the image generated by the focal length is solved.

よって、このような本実施形態に係るレンズ装置１によれば、フォーカスリング２ｒの操作は、フォーカス調整機構Ｍｆと像面調整機構Ｍｉの双方に対して、同時に、かつダイレクトに伝達されるため、フォーカス調整と像面調整の双方の調整、即ち、前側レンズ部Ｌｆａと後側レンズ部Ｌｆｂの変位のタイミングを常に同期させことができる。したがって、像面調整の遅延を解消し、応答性を高めることができ、フォーカス調整及び像面調整の双方に対する高速化を図れるとともに、安定性及び円滑性の高い調整系を構築できる。また、前側レンズ部Ｌｆａをフォーカスリング２ｒの操作に連動させ、前後方向Ｆｓへ変位させることにより像面調整を行う像面調整機構Ｍｉを設けたため、駆動モータ及び運動変換機構等を含む電気駆動系によりレンズを変位させる等の独立した像面調整系が不要になり、部品点数及び組立工数の削減、更には全体構成の簡略化（単純化）を図ることができる。したがって、部品コスト及び製造コストの双方を含む大幅なコストダウンを実現できるとともに、レンズ装置１全体の小型化及び軽量化にも寄与できる。特に、プロジェクタＰｏの場合、スクリーンに投影される画面サイズが大きく、画像の一部に生じる湾曲現象やボケ現象が目立ちやすいため、この課題を有効に解消する観点からプロジェクタＰｏに適用して最適となる。   Therefore, according to the lens device 1 according to the present embodiment, the operation of the focus ring 2r is simultaneously and directly transmitted to both the focus adjustment mechanism Mf and the image plane adjustment mechanism Mi. It is possible to always synchronize both the focus adjustment and the image plane adjustment, that is, the timing of displacement of the front lens portion Lfa and the rear lens portion Lfb. Therefore, the delay of image plane adjustment can be eliminated and the responsiveness can be improved, and the speed of both focus adjustment and image plane adjustment can be increased, and an adjustment system with high stability and smoothness can be constructed. Further, since the image plane adjustment mechanism Mi that adjusts the image plane by moving the front lens portion Lfa in the front-rear direction Fs in conjunction with the operation of the focus ring 2r is provided, an electric drive system including a drive motor, a motion conversion mechanism, and the like This eliminates the need for an independent image plane adjustment system such as displacing the lens, thereby reducing the number of parts and the number of assembly steps, and further simplifying (simplifying) the overall configuration. Therefore, it is possible to realize a significant cost reduction including both the component cost and the manufacturing cost, and to contribute to the reduction in size and weight of the entire lens apparatus 1. In particular, in the case of the projector Po, the screen size projected on the screen is large, and the bending phenomenon and the blurring phenomenon that occur in a part of the image are easily noticeable. Become.

次に、本発明の変更実施形態に係るレンズ装置１について、図５及び図７を参照して説明する。   Next, a lens apparatus 1 according to a modified embodiment of the present invention will be described with reference to FIGS.

図７は、ヘリコイドネジ部により構成される雄ネジ部７ｓと雌ネジ部５ｎを設計するに際し、後側枠部５（後側レンズ部Ｌｆｂ）が前方Ｆｓｆへ変位量Ｄｃだけ変位した際に、前側枠部７（前側レンズ部Ｌｆａ）が同方向、即ち、前方Ｆｓｆへ変位量Ｄｆだけ変位するように設定したものである。この場合、図５に仮想線で示す特性線Ｑｖように、レンズ装置１からスクリーンまでの距離が長くなるに従って、前側枠部７（前側レンズ部Ｌｆａ）は前方Ｆｓｆへ変位するとともに、レンズ装置１からスクリーンまでの距離が短くなるに従って、前側枠部７（前側レンズ部Ｌｆａ）は後方Ｆｓｒへ変位する。   FIG. 7 shows that when designing the male screw portion 7s and the female screw portion 5n constituted by the helicoid screw portion, the rear frame portion 5 (rear lens portion Lfb) is displaced to the front Fsf by the displacement amount Dc. The front frame portion 7 (front lens portion Lfa) is set to be displaced in the same direction, that is, forward Fsf by the displacement amount Df. In this case, as the distance from the lens device 1 to the screen increases as the characteristic line Qv indicated by the phantom line in FIG. 5, the front frame portion 7 (front lens portion Lfa) is displaced to the front Fsf and the lens device 1. As the distance from the screen to the screen becomes shorter, the front frame portion 7 (front lens portion Lfa) is displaced to the rear Fsr.

このように、本発明の変更実施形態に係るレンズ装置１における像面調整機構Ｍｉによれば、後側レンズ部Ｌｆｂを前方Ｆｓｆへ変位させた際に、前側レンズ部Ｌｆａを前方Ｆｓｆへ変位させることもできるし、前側レンズ部Ｌｆａを後方Ｆｓｒへ変位させることもできる。したがって、様々な異なるレンズ群構成に対応させることができるとともに、必要に応じて周辺にボケを生じさせるなどの特殊効果を演出する特殊な光学機器としても構築できるなど、多様性及び多機能性に優れる。   Thus, according to the image plane adjustment mechanism Mi in the lens apparatus 1 according to the modified embodiment of the present invention, when the rear lens portion Lfb is displaced to the front Fsf, the front lens portion Lfa is displaced to the front Fsf. It is also possible to displace the front lens portion Lfa to the rear Fsr. Therefore, it can be adapted to various lens group configurations, and can be constructed as a special optical device that produces special effects such as blurring around if necessary. Excellent.

以上、好適実施形態（変更実施形態）について詳細に説明したが、本発明は、このような実施形態に限定されるものではなく、細部の構成，形状，素材，数量等において、本発明の要旨を逸脱しない範囲で、任意に変更，追加，削除することができる。   The preferred embodiment (modified embodiment) has been described in detail above. However, the present invention is not limited to such an embodiment, and the gist of the present invention in the configuration, shape, material, quantity, and the like of details. Any change, addition, or deletion can be made without departing from.

例えば、レンズ装置１は、光学機器Ｐに対して交換式であってもよいし非交換式であってもよい。また、例示のレンズ群Ｌｆは、レンズ装置１における前側のレンズ群Ｌｆに適用した場合を示したが、レンズ装置１全体における後側のレンズ群であってもよいし、中間のレンズ群であってもよい。一方、像面調整機構Ｍｉとして、前側レンズ部Ｌｆａを変位させる場合を示したが、後側レンズ部Ｌｆｂを変位させる構成であってもよい。したがって、レンズ群Ｌｆを、例えば、前レンズ部，中間レンズ部及び後レンズ部のように三つに分けてもよいし、この際、前レンズ部と中間レンズ部の双方を、像面調整機構Ｍｉとしてそれぞれ独立して変位させる態様を排除するものではない。他方、フォーカス調整操作部２として、フォーカスリング２ｒを例示したが、例えば、リニア式駆動部により中間筒３或いは後側枠部５を直接変位させるような形態であってもよい。したがって、この際には、中間筒３或いは後側枠部５がフォーカス調整操作部２を兼ねることになる。また、フォーカス調整機構Ｍｆは既存（公知）の構造を利用する態様を例示したが、例示以外の構造を排除するものではない。   For example, the lens apparatus 1 may be exchangeable with respect to the optical device P or non-exchangeable. In addition, although the example lens group Lf is applied to the front lens group Lf in the lens apparatus 1, it may be a rear lens group in the entire lens apparatus 1 or an intermediate lens group. May be. On the other hand, the case where the front lens portion Lfa is displaced as the image plane adjustment mechanism Mi has been described, but the rear lens portion Lfb may be displaced. Therefore, the lens group Lf may be divided into three parts, for example, a front lens part, an intermediate lens part, and a rear lens part. At this time, both the front lens part and the intermediate lens part are divided into image plane adjustment mechanisms. A mode of independently displacing Mi is not excluded. On the other hand, the focus ring 2r has been exemplified as the focus adjustment operation unit 2, but for example, the intermediate cylinder 3 or the rear frame unit 5 may be directly displaced by a linear drive unit. Therefore, in this case, the intermediate cylinder 3 or the rear frame portion 5 also serves as the focus adjustment operation portion 2. Further, although the focus adjustment mechanism Mf has exemplified the mode of using the existing (known) structure, the structure other than the example is not excluded.

本発明に係るレンズ装置１は、例示したプロジェクタＰｏをはじめ、スチルカメラやビデオカメラ等を含む各種の光学機器Ｐに利用できる。   The lens device 1 according to the present invention can be used for various optical devices P including the exemplified projector Po, a still camera, a video camera, and the like.

１：レンズ装置，２：フォーカス調整操作部，２ｒ：フォーカスリング，３：中間筒，４：支持枠部，５：後側枠部，６：外筒，７：前側枠部，Ｐ：光学機器，Ｍｆ：フォーカス調整機構，Ｍｉ：像面調整機構，Ｐｏ：プロジェクタ，Ｌｆ：レンズ群，Ｌｆａ：前側レンズ部，Ｌｆｂ：後側レンズ部，Ｆｓ：前後方向，Ｆｓｆ：前方，Ｆｓｒ：後方，Ｆｒ：回動方向   DESCRIPTION OF SYMBOLS 1: Lens apparatus, 2: Focus adjustment operation part, 2r: Focus ring, 3: Intermediate | middle cylinder, 4: Support frame part, 5: Rear side frame part, 6: Outer cylinder, 7: Front side frame part, P: Optical apparatus , Mf: focus adjustment mechanism, Mi: image plane adjustment mechanism, Po: projector, Lf: lens group, Lfa: front lens unit, Lfb: rear lens unit, Fs: front-rear direction, Fsf: front, Fsr: rear, Fr : Direction of rotation

Claims (6)

少なくともフォーカス調整操作部の操作により所定のレンズ群を前後方向へ変位させてフォーカス調整を行うフォーカス調整機構を備えてなる光学機器のレンズ装置において、前記レンズ群を少なくとも前後に位置する前側レンズ部と後側レンズ部に分け、前記前側レンズ部と前記後側レンズ部をそれぞれ独立して変位可能に支持するとともに、前記フォーカス調整操作部の操作により、前記前側レンズ部と前記後側レンズ部を同時に前後方向へ変位させてフォーカス調整を行うフォーカス調整機構を備えるとともに、前記前側レンズ部又は前記後側レンズ部の一方を前記フォーカス調整操作部の操作に連動させ、前後方向へ変位させることにより像面調整を行う像面調整機構を備えてなることを特徴とする光学機器のレンズ装置。   In a lens apparatus of an optical apparatus that includes a focus adjustment mechanism that performs focus adjustment by displacing a predetermined lens group in the front-rear direction by operating at least a focus adjustment operation unit; and a front lens unit that positions the lens group at least in the front-rear direction The front lens unit and the rear lens unit are each detachably supported in a rear lens unit so that they can be displaced independently, and the front lens unit and the rear lens unit are simultaneously operated by operating the focus adjustment operation unit. The image plane is provided with a focus adjustment mechanism that adjusts the focus by displacing in the front-rear direction, and by displacing one of the front lens unit or the rear lens unit in the front-rear direction in conjunction with the operation of the focus adjustment operation unit A lens apparatus for an optical apparatus, comprising an image plane adjustment mechanism for performing adjustment. 前記フォーカス調整操作部は、電動又は手動により回動操作可能なフォーカスリングであることを特徴とする請求項１記載の光学機器のレンズ装置。   The lens apparatus for an optical apparatus according to claim 1, wherein the focus adjustment operation unit is a focus ring that can be electrically or manually rotated. 前記フォーカス調整機構は、前記フォーカス調整操作部の操作により回動する中間筒と、この中間筒に対して、前後方向の変位が許容され、かつ回動方向の変位が規制されるとともに 前記後側レンズ部を支持し、かつ少なくとも回動方向が規制された支持枠部に対して同軸上に螺合させた後側枠部とを備えることを特徴とする請求項１又は２記載の光学機器のレンズ装置。   The focus adjustment mechanism includes an intermediate cylinder that is rotated by an operation of the focus adjustment operation unit, a displacement in the front-rear direction is allowed with respect to the intermediate cylinder, and a displacement in the rotation direction is restricted, and the rear side The optical device according to claim 1, further comprising a rear frame portion that supports the lens portion and is screwed coaxially with a support frame portion that is restricted at least in a rotation direction. Lens device. 前記像面調整機構は、固定された外筒に対して、前後方向の変位が許容され、かつ回動方向の変位が規制されるとともに、前記前側レンズ部を支持し、かつ前記後側枠部に対して同軸上に螺合させた前側枠部とを備えることを特徴とする請求項３記載の光学機器のレンズ装置。   The image plane adjustment mechanism is allowed to displace in the front-rear direction with respect to the fixed outer cylinder and is restricted from being displaced in the rotational direction, supports the front lens part, and the rear frame part. The lens apparatus for an optical device according to claim 3, further comprising: a front frame portion that is coaxially screwed with respect to the front side frame portion. 前記像面調整機構は、前記後側レンズ部を前方へ変位させた際に、前記前側レンズ部を前方へ変位させ、又は前記前側レンズ部を後方へ変位させることを特徴とする請求項１〜４のいずれかに記載の光学機器のレンズ装置。   2. The image plane adjusting mechanism displaces the front lens unit forward or displaces the front lens unit rearward when the rear lens unit is displaced forward. 5. A lens apparatus for an optical instrument according to any one of 4 above. 光学機器としてプロジェクタに適用することを特徴とする請求項１〜５のいずれかに記載の光学機器のレンズ装置。   The lens apparatus for an optical apparatus according to claim 1, wherein the lens apparatus is applied to a projector as an optical apparatus.
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CN111240135A (en) * 2020-04-10 2020-06-05 中航国画（上海）激光显示科技有限公司 Projector lens displacement adjusting mechanism, adjusting method and projector
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