JPH0736330Y2 - Lens holding device - Google Patents

Lens holding device

Info

Publication number
JPH0736330Y2
JPH0736330Y2 JP5049889U JP5049889U JPH0736330Y2 JP H0736330 Y2 JPH0736330 Y2 JP H0736330Y2 JP 5049889 U JP5049889 U JP 5049889U JP 5049889 U JP5049889 U JP 5049889U JP H0736330 Y2 JPH0736330 Y2 JP H0736330Y2
Authority
JP
Japan
Prior art keywords
lens
split
split lens
lens barrel
outer frame
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.)
Expired - Lifetime
Application number
JP5049889U
Other languages
Japanese (ja)
Other versions
JPH02140511U (en
Inventor
利徳 森川
隆宣 矢吹
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP5049889U priority Critical patent/JPH0736330Y2/en
Publication of JPH02140511U publication Critical patent/JPH02140511U/ja
Application granted granted Critical
Publication of JPH0736330Y2 publication Critical patent/JPH0736330Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Lens Barrels (AREA)

Description

【考案の詳細な説明】 産業上の利用分野 本考案は、ビデオカメラ用撮影レンズなどに用いること
ができるレンズ保持装置に関するものである。
TECHNICAL FIELD The present invention relates to a lens holding device that can be used as a taking lens for a video camera or the like.

従来の技術 近年、ビデオカメラの普及に伴ない撮影レンズの需要が
急激に拡大し、ジュシ等の使用により、小型軽量化,低
コスト化の要求が強まっている。レンズを保持する鏡胴
においても構成の簡易化によって生産性の向上を図る試
みが行なわれている。
2. Description of the Related Art In recent years, with the spread of video cameras, the demand for taking lenses has rapidly expanded, and the use of Jusi and the like has increased the demand for smaller size, lighter weight, and lower cost. Even in a lens barrel that holds a lens, attempts have been made to improve productivity by simplifying the configuration.

以下図面を参照しながら従来のレンズ保持装置について
説明する。
A conventional lens holding device will be described below with reference to the drawings.

第5図は従来のレンズ保持装置の部分断面図であり、ズ
ームレンズのバックフォーカス(以降BFと称す)調整を
行なうマスターレンズ群の固定によく用いられている構
造を示している。第5図において、1は光軸、2及び3
は光軸1を含む平面で2分割された2個の同一形状の分
割鏡胴である。該分割鏡胴2及び3は樹脂材料で形成さ
れ、レンズ4,5,6,7,8が光軸1に対して垂直方向より挿
入可能に構成されている。その保持を1つのレンズで説
明すると、レンズ8の外周部は分割鏡胴2の内側面のレ
ンズ保持部9によって位置を定められ、且つ分割鏡胴2
の内側に設けた弾性片10によってレンズ8をレンズ規制
部11に押圧することにより光軸方向の位置決めを行なっ
ている。他のレンズ4,5,6,7も同様に保持され、一方の
分割鏡胴2にレンズを挿入後、他方の分割鏡胴3を覆い
かぶせ、分割鏡胴2,3の外周に例えば公知の粘着テープ1
2を巻くと共に、光軸1方向よりリング状のBFギヤ13を
挿入し、分割鏡胴2及び3同志を密着させている。分割
鏡胴2及び3とBFギヤ13との結合を第2図に示す。分割
鏡胴2及び3の分割部分でかつBFギヤ13挿入部に設けら
れた凸部14及び15にBFギヤ13の内側に設けられた凹部16
とが係合し、BFギヤ13と分割鏡胴2及び3が一体化され
ている。第5図に戻り、17は外枠、18はその外枠17の内
側に設けられた雌ネジで、上記分割鏡胴2及び3の雄ネ
ジ19と螺合する。20及び21はガイド部で外枠17に対し分
割鏡胴2及び3が、その光軸1方向に移動可能な構成に
なっている。22はコイルバネで、BFギヤ13を介して分割
鏡胴2及び3を外枠17に対し光軸1方向に付勢してい
る。又このコイルバネに替わる公知の手段で何ら支障は
ない。23は外枠17に設けられた孔で、前記BFギヤ13を外
部より駆動できるようになっている。
FIG. 5 is a partial cross-sectional view of a conventional lens holding device, showing a structure often used for fixing a master lens group for adjusting a back focus (hereinafter referred to as BF) of a zoom lens. In FIG. 5, 1 is an optical axis, 2 and 3
Are two split lens barrels of the same shape which are split into two in a plane including the optical axis 1. The split lens barrels 2 and 3 are made of a resin material, and the lenses 4,5, 6, 7, 8 can be inserted in a direction perpendicular to the optical axis 1. To describe the holding with one lens, the outer peripheral portion of the lens 8 is positioned by the lens holding portion 9 on the inner surface of the split lens barrel 2, and
The lens 8 is pressed against the lens restricting portion 11 by the elastic piece 10 provided inside the lens to position the lens in the optical axis direction. The other lenses 4, 5, 6 and 7 are also held in the same manner. After inserting the lens into one of the split lens barrels 2, the other split lens barrel 3 is covered and the outer circumferences of the split lens barrels 2 and 3, for example, are known. Adhesive tape 1
While winding 2 and inserting a ring-shaped BF gear 13 from the direction of the optical axis, the split lens barrels 2 and 3 are in close contact with each other. The connection between the split lens barrels 2 and 3 and the BF gear 13 is shown in FIG. Recesses 16 provided inside the BF gear 13 on convex portions 14 and 15 provided on the insertion portion of the BF gear 13 at the divided portions of the split lens barrels 2 and 3.
Engage with each other, and the BF gear 13 and the split lens barrels 2 and 3 are integrated. Returning to FIG. 5, 17 is an outer frame, and 18 is a female screw provided on the inner side of the outer frame 17, which is screwed with the male screw 19 of the split lens barrels 2 and 3. Reference numerals 20 and 21 are guide portions, and the split lens barrels 2 and 3 are movable with respect to the outer frame 17 in the optical axis 1 direction. Reference numeral 22 denotes a coil spring, which biases the split lens barrels 2 and 3 via the BF gear 13 against the outer frame 17 in the optical axis 1 direction. Further, there is no problem with the known means replacing the coil spring. Reference numeral 23 is a hole provided in the outer frame 17 so that the BF gear 13 can be driven from the outside.

考案が解決しようとする課題 しかしながら、従来の構成においては、分割鏡胴2及び
3が樹脂材料でかつ半割の構造より構成されるため、第
6図に示すように矢印A方向に収縮のヒケを生じる。そ
のため中央部で当り面が形成され、その両側に設けられ
たガイド部20′及び21′の寸法が安定せず、BFギヤ13の
挿入が困難となったり、外枠17への挿入がそのガイド部
20及び21でコヂを発生させ、分割鏡胴2及び3の外枠17
への回転挿入の負荷が大きく変動し作業に支障を与えた
り、分割鏡胴2,3の互いの合わせがずれたりする。更に
レンズ4及び8近傍での光束の光学有効径を有効に形成
させることができず、分割鏡胴2及び3の合わせ面のス
キマΔlにより反射等によるモレ光の混入を招き、ゴー
ストフレアーの発生要因になっていた。更に分割鏡胴2
及び3内でのレンズ4〜8の保持が上記ソリAにより不
完全となっており、光学性能の劣化要因ともなってい
た。
However, in the conventional configuration, since the split lens barrels 2 and 3 are made of a resin material and have a half-divided structure, shrink marks in the direction of arrow A as shown in FIG. Cause Therefore, the contact surface is formed in the central portion, and the dimensions of the guide portions 20 'and 21' provided on both sides thereof are not stable, making it difficult to insert the BF gear 13 or inserting it into the outer frame 17 by the guide. Department
A code is generated at 20 and 21, and the outer frame 17 of the split lens barrels 2 and 3
The load of rotating and inserting the lens into the lens barrel fluctuates greatly, which hinders the work, or causes the split lens barrels 2 and 3 to be misaligned with each other. Further, it is not possible to effectively form the optical effective diameter of the light flux in the vicinity of the lenses 4 and 8, and the gap Δl of the mating surfaces of the split lens barrels 2 and 3 causes the leakage light to be mixed in due to reflection and the like, and ghost flare is generated. It was a factor. Further split lens barrel 2
The holding of the lenses 4 to 8 in the lens Nos. 3 and 3 is incomplete due to the warp A, which also causes deterioration of the optical performance.

本考案は上記問題点に鑑み、レンズ鏡胴の作業性の向上
及びその光学性能の向上を可能にしたレンズ保持装置を
提供することを目的とするものである。
The present invention has been made in view of the above problems, and an object thereof is to provide a lens holding device capable of improving the workability of a lens barrel and the optical performance thereof.

課題を解決するための手段 上記目的を達成するため、本考案のレンズ保持装置は、
複数枚のレンズと、前記レンズを保持するための保持溝
を内面に有し、前記レンズの光軸を含む平面で2分割さ
れ、且つその互いの合わせ当り面を、その両端部近傍に
設けた分割鏡胴と、該分割鏡胴の外周部に嵌合可能なBF
ギヤと、該BFギヤを前記分割鏡胴に対して位置決めする
位置決め手段と、前記分割鏡胴の外周部に設けられた雄
ネジと、該雄ネジに螺合する雌ネジを有し前記分割鏡胴
を保持する外枠と、前記分割鏡胴を前記外枠に対して光
軸方向に付勢する付勢手段とを備えたものである。
In order to achieve the above object, the lens holding device of the present invention is
A plurality of lenses and a holding groove for holding the lens are provided on the inner surface, and the lens is divided into two parts by a plane including the optical axis of the lens, and their mating contact surfaces are provided near both ends thereof. A split lens barrel and a BF that can be fitted to the outer periphery of the split lens barrel
The split mirror having a gear, positioning means for positioning the BF gear with respect to the split lens barrel, a male screw provided on an outer peripheral portion of the split lens barrel, and a female screw screwed to the male screw. An outer frame for holding the barrel and a biasing means for biasing the split lens barrel in the optical axis direction with respect to the outer frame are provided.

作用 本考案は上記した分割鏡胴の互いの合わせ当り面をその
両端部近傍に配した構成によって作業性の向上,及び光
学性能の向上を可能にする。
Operation The present invention makes it possible to improve workability and optical performance by arranging the abutting surfaces of the above-mentioned split lens barrels in the vicinity of both ends thereof.

実施例 以下、本考案の一実施例のレンズ保持装置について、図
面を参照しながら説明する。第1図〜第4図は本考案の
一実施例におけるレンズ保持装置を示すものである。図
番の共通のものは説明をさけ新規のものについて説明す
る。第3図において、24及び25は分割鏡胴2及び3の両
端部に位置するレンズ4及び8の近傍に設けられ、且つ
その内径側に設けられた合わせ当り面である。この合わ
せ当り面24及び25と他の合わせ面26との間には材料の収
縮ヒケを考慮にあらかじめ約0.05〜0.2mmの段差が設け
られ、分割鏡胴2及び3を合わせて一体化した状態にお
いて、第4図に示すように必ず上記合わせ当り面24及び
25が合わされるようになっている。26は前述したBFギヤ
13を駆動する外部のギヤを示し、マスターレンズを光軸
1方向に移動させてBFを調整する時に使用するものであ
る。
Embodiment Hereinafter, a lens holding device according to an embodiment of the present invention will be described with reference to the drawings. 1 to 4 show a lens holding device according to an embodiment of the present invention. Description of common drawing numbers will be omitted, and new ones will be described. In FIG. 3, reference numerals 24 and 25 are mating contact surfaces provided near the lenses 4 and 8 located at both ends of the split lens barrels 2 and 3 and on the inner diameter side thereof. A step of about 0.05 to 0.2 mm is provided in advance between the mating contact surfaces 24 and 25 and the other mating surface 26 in consideration of shrinkage shrinkage of the material, and the split lens barrels 2 and 3 are integrated and integrated. In the above, as shown in FIG.
25 are adapted to fit together. 26 is the aforementioned BF gear
An external gear for driving 13 is shown, which is used when the master lens is moved in the direction of the optical axis 1 to adjust the BF.

以上の様に構成されたレンズ保持装置について以下に動
作を説明する。
The operation of the lens holding device configured as described above will be described below.

レンズ4,5,6,7,8を保持しBFギヤ13が挿入された分割鏡
胴2及び3はコイルバネ22を介して外枠17に螺合された
状態に組立てられる。そしてカメラユニット(図示せ
ず)のBF調整の際は外枠17に設けた孔23よりギヤ26でBF
ギヤ13を駆動すると外枠17に対し分割鏡胴2及び3が光
軸1方向に移動される。この時、コイルバネ22の付勢力
が作用しているため、雄ネジ19,雌ネジ18間の摩擦力で
分割鏡胴2及び3が外枠17に対して移動不能に固定され
る為、調整用のギヤ26を脱してもBF調整が狂うことはな
い。又分割鏡胴2及び3の合わせ当り面24及び25により
確実に該当り面同志が合わされる。
The split lens barrels 2 and 3 holding the lenses 4, 5, 6, 7, 8 and having the BF gear 13 inserted therein are assembled in a state of being screwed to the outer frame 17 via the coil spring 22. When adjusting the BF of the camera unit (not shown), use the gear 26 through the hole 23 provided in the outer frame 17 to adjust the BF.
When the gear 13 is driven, the split lens barrels 2 and 3 are moved relative to the outer frame 17 in the optical axis 1 direction. At this time, since the urging force of the coil spring 22 acts, the split lens barrels 2 and 3 are immovably fixed to the outer frame 17 by the frictional force between the male screw 19 and the female screw 18, so that the adjustment is possible. BF adjustment does not go wrong even if you take off gear 26 of. The mating contact surfaces 24 and 25 of the split lens barrels 2 and 3 ensure that the corresponding surfaces are matched.

以上のように本実施例によれば、レンズ組立及びBF調整
が容易となり、作業性の向上及び合わせ当り面24及び25
が確立に当接するため、光の有効径を確実に形成でき、
余分な反射光などをカットできるものである。
As described above, according to this embodiment, lens assembly and BF adjustment are facilitated, workability is improved, and the mating contact surfaces 24 and 25 are adjusted.
Since it comes into contact with the establishment, the effective diameter of light can be reliably formed,
It can cut off excess reflected light.

考案の効果 本考案によれば、複数枚のレンズと、該レンズを保持す
るための保持溝を内面に有し前記レンズの光軸を含む平
面で2分割され、且つその互いの合わせ当り面をその両
端部近傍に設けた分割鏡胴と、該分割鏡胴の外周部に嵌
合可能なBFギヤと、該BFギヤを前記分割鏡胴に対して位
置決めする位置決め手段と、前記分割鏡胴の外周部に設
けられた雄ネジと、該雄ネジと螺合する雌ネジを有し前
記分割鏡胴を保持する外枠と、前記分割鏡胴を前記外枠
に対して光軸方向に付勢する付勢手段とを備えたことに
より、分割鏡胴の各部寸法が安定化し組立て作業性が向
上すると共に、分割鏡胴へのストレスも少なく性能の劣
化も防止できる、更に合わせ当り面の確実な接合によ
り、光束を有効径で確実にカットでき更に、スキマ等よ
り混入してくる反射光を確実にカットできるため、ゴー
ストフレアーなどの発生を押えることができるというす
ぐれた効果が得られるものである。
EFFECTS OF THE INVENTION According to the present invention, a plurality of lenses and a holding groove for holding the lenses are provided on the inner surface, and the lens is divided into two parts by a plane including the optical axis of the lenses. A split lens barrel provided near both ends thereof, a BF gear that can be fitted to the outer peripheral portion of the split lens barrel, positioning means for positioning the BF gear with respect to the split lens barrel, and the split lens barrel A male screw provided on an outer peripheral portion, an outer frame having a female screw threaded to the male screw and holding the split lens barrel, and the split lens barrel urged in the optical axis direction with respect to the outer frame. By providing the urging means to stabilize the size of each part of the split lens barrel and improve the assembling workability, there is little stress on the split lens barrel and the deterioration of the performance can be prevented. By joining, the light flux can be reliably cut with an effective diameter Provides positive cutting reflected light coming, in which is excellent effect that it is possible to suppress the occurrence of ghost flare is obtained.

【図面の簡単な説明】 第1図は本考案の一実施例におけるレンズ保持装置の断
面図、第2図は同じくBFギヤ部の部分断面図、第3図,
第4図は同じく分割鏡胴部の説明図、第5図は従来のレ
ンズ保持装置の断面図、第6図は同じく分割鏡胴部の説
明図である。 2,3……分割鏡胴、4,5,6,7,8……レンズ、9……レンズ
保持部、10……弾性片、11……レンズ規制部、13……BF
ギヤ、17……外枠、18……雌ネジ、19……雄ネジ、20,2
1……ガイド部、22……コイルバネ、24,25……合わせ当
り面。
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a lens holding device according to an embodiment of the present invention, and FIG. 2 is a partial sectional view of a BF gear portion, FIG.
FIG. 4 is an explanatory view of the split lens barrel portion, FIG. 5 is a sectional view of a conventional lens holding device, and FIG. 6 is an explanatory view of the split lens barrel portion. 2,3 …… Split barrel, 4,5,6,7,8 …… Lens, 9 …… Lens holding part, 10 …… Elastic piece, 11 …… Lens control part, 13 …… BF
Gear, 17 ... Outer frame, 18 ... Female screw, 19 ... Male screw, 20,2
1 …… Guide part, 22 …… Coil spring, 24,25 …… Mating contact surface.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項1】複数枚のレンズと、該レンズを保持するた
め、その内側に設けられた保持溝および位置調整用雄ネ
ジおよびバックフォーカスギヤの位置決め手段を有し、
前記レンズの光軸を含む平面で2分割された分割鏡胴
と、該分割鏡胴の外周部に嵌合するバックフォーカスギ
ヤと、前記分割鏡胴の雄ネジと螺合する雌ネジを有し
て、前記分割鏡胴を保持する外枠と、前記分割鏡胴を前
記外枠に対して光軸方向に付勢する付勢手段とを備え、
前記分割鏡胴の互いの合わせ当面をその両端に位置する
レンズ保持溝の近傍で、且つその内側に設けたことを特
徴とするレンズ保持装置。
1. A plurality of lenses, a holding groove, a male screw for position adjustment, and a positioning means for a back focus gear, which are provided inside the lens to hold the lenses,
It has a split lens barrel divided into two parts on a plane including the optical axis of the lens, a back focus gear fitted to an outer peripheral portion of the split lens barrel, and a female screw screwed with a male screw of the split lens barrel. An outer frame that holds the split lens barrel, and a biasing unit that biases the split lens barrel in the optical axis direction with respect to the outer frame,
A lens holding device, characterized in that the mating abutting surfaces of the split lens barrels are provided in the vicinity of and inside the lens holding grooves located at both ends thereof.
JP5049889U 1989-04-28 1989-04-28 Lens holding device Expired - Lifetime JPH0736330Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5049889U JPH0736330Y2 (en) 1989-04-28 1989-04-28 Lens holding device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5049889U JPH0736330Y2 (en) 1989-04-28 1989-04-28 Lens holding device

Publications (2)

Publication Number Publication Date
JPH02140511U JPH02140511U (en) 1990-11-26
JPH0736330Y2 true JPH0736330Y2 (en) 1995-08-16

Family

ID=31569097

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5049889U Expired - Lifetime JPH0736330Y2 (en) 1989-04-28 1989-04-28 Lens holding device

Country Status (1)

Country Link
JP (1) JPH0736330Y2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05127059A (en) * 1991-10-30 1993-05-25 Asahi Optical Co Ltd Device for adjusting focus of variable focal distance lens for camera

Also Published As

Publication number Publication date
JPH02140511U (en) 1990-11-26

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