JPH0753335Y2 - Back focus adjustment mechanism - Google Patents

Back focus adjustment mechanism

Info

Publication number
JPH0753335Y2
JPH0753335Y2 JP14599588U JP14599588U JPH0753335Y2 JP H0753335 Y2 JPH0753335 Y2 JP H0753335Y2 JP 14599588 U JP14599588 U JP 14599588U JP 14599588 U JP14599588 U JP 14599588U JP H0753335 Y2 JPH0753335 Y2 JP H0753335Y2
Authority
JP
Japan
Prior art keywords
camera head
optical axis
base
elongated hole
fixed
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
JP14599588U
Other languages
Japanese (ja)
Other versions
JPH0279672U (en
Inventor
泰久 窪田
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.)
Victor Company of Japan Ltd
Original Assignee
Victor Company of Japan 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 Victor Company of Japan Ltd filed Critical Victor Company of Japan Ltd
Priority to JP14599588U priority Critical patent/JPH0753335Y2/en
Publication of JPH0279672U publication Critical patent/JPH0279672U/ja
Application granted granted Critical
Publication of JPH0753335Y2 publication Critical patent/JPH0753335Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Description

【考案の詳細な説明】 (産業上の利用分野) 本考案は、ビデオカメラのバックフォーカス調整機構、
詳しくは、カメラヘッドマウントに対して、撮像板を取
り付けたベースを光軸方向に前後に動かすことによりレ
ンズの焦点に撮像板の位置を適切に合わせるためのバッ
クフォーカス調整機構に関する。
DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a back focus adjustment mechanism for a video camera,
More specifically, the present invention relates to a back focus adjustment mechanism for appropriately aligning the position of the image pickup plate with the focal point of the lens by moving the base having the image pickup plate attached to the camera head mount back and forth in the optical axis direction.

(従来の技術とその課題) 従来のこの種の焦点位置出し機構の一例は第5図に示す
ように構成されていた。なお、本例に於けるカメラヘッ
ドマウント(以下、カメラヘッドと云う)Aは例えば交
換可能なレンズ鏡筒を装着するカメラヘッドであって、
その主体となるヘッドフレーム1の前部に、上記レンズ
鏡筒を装着するマウント2がねじ込まれており、同ヘッ
ドフレーム1の後部には、撮像板5が取り付けられてい
る。このようなカメラヘッドAに於いては、ヘッドフレ
ーム1の前部にねじ込まれたマウント2を回転させるこ
とにより、ヘッドフレーム11に固定されている撮像板に
対してレンズの位置を前後に移動させてレンズの焦点に
合わせ、固定リング3と固定ねじ4によってヘッドフレ
ーム1に固定するようになっている。即ち、上記マウン
ト2は、レンズと共に回転させることにより、光軸方向
に進退し、上記レンズの焦点距離に撮像板とレンズの距
離に合わせた位置で固定される。
(Prior Art and Problems Thereof) An example of a conventional focus position finding mechanism of this type is constructed as shown in FIG. A camera head mount (hereinafter referred to as a camera head) A in this example is a camera head having a replaceable lens barrel, for example,
A mount 2 for mounting the lens barrel is screwed into a front portion of a head frame 1 which is a main body thereof, and an image pickup plate 5 is attached to a rear portion of the head frame 1. In such a camera head A, the position of the lens is moved back and forth with respect to the imaging plate fixed to the head frame 11 by rotating the mount 2 screwed into the front portion of the head frame 1. The lens is focused on the lens and fixed to the head frame 1 by the fixing ring 3 and the fixing screw 4. That is, when the mount 2 is rotated together with the lens, the mount 2 advances and retreats in the optical axis direction, and is fixed at a position corresponding to the distance between the imaging plate and the lens at the focal length of the lens.

ところが、このようなバックフォーカス調整機構に於い
て、上記マウント2に装着されたレンズの焦点距離調整
をするためにはマウント2を適宜方向に回転をさせなけ
ればならない。そのため、マウント2に装着されたレン
ズが大きいと、マウント2を回すことが非常に困難にな
り、又、小さいレンズでもオートアイリス用コネクター
プラグが付いているレンズはマウント2を回す毎にプラ
グを抜くために映像を見ながら焦点距離にレンズを合わ
せられないので、レンズ鏡筒の位置合わせが極めて厄介
であるという欠点を有している。
However, in such a back focus adjusting mechanism, in order to adjust the focal length of the lens mounted on the mount 2, the mount 2 must be rotated in an appropriate direction. Therefore, if the lens mounted on the mount 2 is large, it becomes very difficult to rotate the mount 2, and even for a small lens, the lens with the connector plug for auto iris is unplugged every time the mount 2 is rotated. Since the lens cannot be adjusted to the focal length while viewing the image, there is a drawback that the alignment of the lens barrel is extremely troublesome.

(課題を解決するための手段) 本考案の目的は、上記の欠点に鑑み、上記撮像板をレン
ズ鏡筒に対して前後に進退自在に配設すると共に、光軸
方向と垂直方向にのみ摺動し、調整専用ねじを回すこと
により動き撮像板の位置出しするブラケットを巧みに配
設することによって、上述した従来のこの種のバックフ
ォーカス調整機構が有していた欠点を解決したバックフ
ォーカス調整機構を提供するにある。
(Means for Solving the Problems) In view of the above-mentioned drawbacks, an object of the present invention is to dispose the image pickup plate so as to be movable back and forth with respect to the lens barrel, and to slide the image pickup plate only in a direction perpendicular to the optical axis direction. Back focus adjustment that solves the drawbacks of the conventional back focus adjustment mechanism of this type described above by skillfully disposing the bracket that moves and turns the adjustment exclusive screw to position the imaging plate. To provide the mechanism.

そして、本考案は、レンズを固定するカメラヘッドマウ
ントに対して、撮像板を固定したベースを光軸方向に前
後に移動させ、レンズの焦点に前記撮像板の位置を合わ
せるバックフォーカス調整機構において、前記カメラヘ
ッドマウントの外周面に形成された平面部に光軸と直交
する方向にのみ規制された状態で直線的に摺動する調整
板を配置し、この調整板に前記光軸方向と所定の角度を
有する傾斜長孔を穿設する一方、この傾斜長孔と交差す
るよう前記カメラヘッドマウントにその光軸方向に長孔
を穿設し、前記傾斜長孔及び長孔を介して挿通された案
内部材を前記撮像板を固定したベースに固定し、前記調
整板を前記カメラヘッドマウントに取り付けた調整ねじ
に螺合してなり、前記調整ねじを進退移動させることに
よりこの調整板が前記案内部材を介して前記ベースを光
軸方向に移動され、このベースと前記カメラヘッドマウ
ントとを固定ねじにて固定してなるバックフォーカス調
整機構を提供するものである。
Then, the present invention provides a back focus adjusting mechanism for moving a base having an image pickup plate back and forth in an optical axis direction with respect to a camera head mount for fixing a lens so as to align the position of the image pickup plate with a focal point of the lens. An adjusting plate that linearly slides in a restricted state only in a direction orthogonal to the optical axis is arranged on a flat surface formed on the outer peripheral surface of the camera head mount, and the adjusting plate is provided with a predetermined direction in the optical axis direction. While forming an inclined elongated hole having an angle, an elongated hole was formed in the camera head mount so as to intersect with the inclined elongated hole in the optical axis direction, and was inserted through the inclined elongated hole and the elongated hole. The guide member is fixed to a base to which the image pickup plate is fixed, and the adjusting plate is screwed to an adjusting screw attached to the camera head mount. By moving the adjusting screw forward and backward, the adjusting plate is moved. Is moved to the base via a serial guide member in the optical axis direction, there is provided a back focus adjustment mechanism formed of a fixed and this base and the camera head mounted at a fixed screw.

(実施例) 第1図,第2図は本考案の一実施例を示すバックフォー
カス調整機構の要部平面図および側面図であり、第3
図,第4図は上記第1図,第2図中のIII−III線、及び
IV−IV線に夫々沿う断面図である。
(Embodiment) FIGS. 1 and 2 are a plan view and a side view of an essential part of a back focus adjusting mechanism showing an embodiment of the present invention.
Figures and 4 are lines III-III in FIGS. 1 and 2, and
It is sectional drawing which follows each IV-IV line.

本考案のバックフォーカス調整機構は、上記各図に示す
ように、カメラヘッド11の後部に形成され、光軸方向と
直交する方向の巾広の帯状の平面部11a上に摺動自在に
当接する当接部13cを有するL字状の横長の調整板であ
るブラケット13と、このブラケット13の中央部近傍に形
成され、光軸方向と角度θ(θは45°以上)の傾きを持
つ傾斜長孔13aと、この傾斜長孔13aを介して挿入される
と共に上記カメラヘッド11の光軸方向に穿設された移動
用長孔(長孔)11cを貫通して、上記カメラヘッド11に
進退自在に嵌合する撮像板18を取り付けるベース12にね
じ込まれるガイドねじ(案内部材)14と、上記ブラケッ
ト13の傾斜長孔13aの両側にて光軸方向と直交する方向
に穿設されたガイド長孔13bと嵌合するよう上記ヘッド1
1の平面部11aに立設されたガイドピン11b(又は同じ役
割をするねじ)と、ブラケット13を平面部11aに沿って
摺動させるようこれと螺合する調整ねじ15と、ベース12
をカメラヘッド11に固定する固定ねじ16と調整ねじ15の
バッククラッシュ防止及び固定ねじ16の抜け防止するよ
う各ねじを案内する支持部を有してカメラヘッド11に固
定されたホルダ17と、上記ベースのカメラヘッド内での
バッククラッシュ(ガタ)防止するために両者間に付勢
されたばね19とで構成されている。
As shown in each of the above figures, the back focus adjusting mechanism of the present invention is formed on the rear portion of the camera head 11 and slidably abuts on a wide strip-shaped flat surface portion 11a in a direction orthogonal to the optical axis direction. A bracket 13 which is an L-shaped laterally long adjustment plate having a contact portion 13c, and an inclination length formed near the central portion of the bracket 13 and having an inclination of an angle θ (θ is 45 ° or more) with the optical axis direction. The hole 13a and the movable long hole (long hole) 11c which is inserted through the slanted long hole 13a and which is formed in the optical axis direction of the camera head 11 penetrates the camera head 11 back and forth. A guide screw (guide member) 14 to be screwed into a base 12 for attaching an image pickup plate 18 to be fitted to and an elongated guide hole formed on both sides of the inclined elongated hole 13a of the bracket 13 in a direction orthogonal to the optical axis direction. Head 1 above to fit with 13b
A guide pin 11b (or a screw that plays the same role) that is erected on the flat surface portion 11a of 1, the adjustment screw 15 that is screwed to the bracket 13 so that the bracket 13 slides along the flat surface portion 11a, and the base 12
A holder 17 fixed to the camera head 11 having a support part for guiding each screw so as to prevent back crush of the fixing screw 16 and the adjusting screw 15 and prevent the fixing screw 16 from coming off, It is composed of a spring 19 biased between the base and the camera head to prevent backlash (backlash) in the camera head.

次に、このように構成された本考案のバックフォーカス
調整機構の作用について説明する。
Next, the operation of the back focus adjusting mechanism of the present invention constructed as described above will be described.

先ず、バックフォーカス調整の初期段階では、第1図,
第2図に示すように、上記ガイドねじ14は上記ブラケッ
ト13の傾斜長孔13aとカメラヘッド11の移動用長孔11cが
交差するほぼ中央部を通じて上記ベース12にブラケット
13の摺動が可能な状態でねじ込まれ、同ブラケット13は
カメラヘッド11の平面部11a上に設置されている。この
状態から撮像板18が固定された上記ベース12をカメラヘ
ッド11内で前後させてバックフォーカス調整するには、
上記カメラヘッド11の平面部11a上に設置されている上
記ブラケット13を調整ねじ15を回転させることにより、
これが平面部11aに沿うごとく光軸方向に対して直交す
る方向に直線的にY1,Y2移動させる。すると、同ブラケ
ット13の傾斜長孔13aの移動によって上記ガイドねじ14
は、上カメラ記ヘッド11の移動用長孔11cに沿って光軸
方向に、前後移動するので、同ねじ14と一体のベース12
は、前後方向(X1,X2)に移動する。ベース12は、ばね
19により一定方向に常に押された状態にあるため、調整
ねじ15で調整を行う時に起こるバッククラッシュを防止
できる。従って、上記ブラケット13を調整ねじ15を回転
させ光軸方向と直交する方向に直線状水平に適宜に移動
させることによって、撮像板18を取付けらベース12をレ
ンズの焦点位置に合わせることが極めて簡単にできる。
このように、撮像板18を取り付けたベース12をレンズの
焦点位置に合わせた後、固定ねじ16を締め込むことによ
り、ベース12が直接カメラヘッド11内側に押しつけられ
カメラヘッド11に固定される。なお、ブラケット13を、
調整ねじ15を回転させることにより直線的に動かすの
で、微調整が簡単に出来、従来微調整が困難であったと
いう欠点は解消される。
First, in the initial stage of back focus adjustment, as shown in FIG.
As shown in FIG. 2, the guide screw 14 is attached to the base 12 through a substantially central portion where the inclined elongated hole 13a of the bracket 13 and the movable elongated hole 11c of the camera head 11 intersect.
The bracket 13 is screwed in a slidable state, and the bracket 13 is installed on the flat surface portion 11a of the camera head 11. To adjust the back focus by moving the base 12 with the imaging plate 18 fixed in this state back and forth inside the camera head 11,
By rotating the adjustment screw 15 on the bracket 13 installed on the flat surface portion 11a of the camera head 11,
This is linearly moved in the direction orthogonal to the optical axis direction Y 1 and Y 2 along the plane portion 11a. Then, the guide screw 14 is moved by the movement of the inclined elongated hole 13a of the bracket 13.
Moves back and forth in the optical axis direction along the moving long hole 11c of the upper camera head 11, so that the base 12 integrated with the screw 14
Moves in the front-back direction (X 1 , X 2 ). Base 12 spring
Since it is always pushed in a fixed direction by 19, it is possible to prevent a back crash that occurs when adjusting with the adjusting screw 15. Therefore, it is extremely easy to adjust the base 12 to the focal position of the lens by attaching the image pickup plate 18 by rotating the adjusting screw 15 and moving the bracket 13 linearly and horizontally in the direction orthogonal to the optical axis direction. You can
In this way, by aligning the base 12 with the image pickup plate 18 at the focal position of the lens and then tightening the fixing screw 16, the base 12 is directly pressed inside the camera head 11 and fixed to the camera head 11. In addition, the bracket 13
Since the adjusting screw 15 is moved linearly by rotating, the fine adjustment can be easily performed, and the drawback that the conventional fine adjustment is difficult is solved.

(効果) 以上説明したように、本考案によれば、極めて簡単な構
造で、従来のこの種のバックフォーカス調整機構が有し
ていた欠点を解決することが出来る。
(Effect) As described above, according to the present invention, it is possible to solve the drawback of the conventional back focus adjusting mechanism of this type with an extremely simple structure.

【図面の簡単な説明】 第1図,第2図は本考案の一実施例を示すバックフォー
カス調整機構の要部平面図および側面図、第3図,第4
図は上記第1図,第2図中のIII−III線、及びIV−IV線
に夫々沿う断面図、第5図は従来のカメラヘッドマウン
トの調整機構を示す断面図である。 11……カメラヘッドマウント、12……ベース、13……ブ
ラケット(調整板)、14……ガイドねじ(案内部材)、
15……調整ねじ、16……固定ねじ、17……ホルダ、18…
…撮像板。
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are a plan view and a side view of an essential part of a back focus adjusting mechanism showing an embodiment of the present invention, FIGS.
The drawings are sectional views taken along lines III-III and IV-IV in FIGS. 1 and 2, respectively, and FIG. 5 is a sectional view showing a conventional adjusting mechanism of a camera head mount. 11 …… Camera head mount, 12 …… Base, 13 …… Bracket (adjustment plate), 14 …… Guide screw (guide member),
15 …… Adjusting screw, 16 …… Fixing screw, 17 …… Holder, 18…
... Imaging board.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項1】レンズを固定するカメラヘッドマウントに
対して、撮像板を固定したベースを光軸方向に前後に移
動させ、レンズの焦点に前記撮像板の位置を合わせるバ
ックフォーカス調整機構において、前記カメラヘッドマ
ウントの外周面に形成された平面部に光軸と直交する方
向にのみに規制された状態で直線的に摺動する調整板を
配置し、この調整板に前記光軸方向と所定の角度を有す
る傾斜長孔を穿設する一方、この傾斜長孔と交差するよ
う前記カメラヘッドマウントにその光軸方向に長孔を穿
設し、前記傾斜長孔及び長孔を介して挿通された案内部
材を前記撮像板を固定したベースに固定し、前記調整板
を前記カメラヘッドマウントに取り付けた調整ねじに螺
合してなり、前記調整ねじを進退移動させることにより
この調整板が前記案内部材を介して前記ベースを光軸方
向に移動され、このベースと前記カメラヘッドマウント
とを固定ねじにて固定してなるバックフォーカス調整機
構。
1. A back focus adjusting mechanism for moving a base, on which an image pickup plate is fixed, back and forth in an optical axis direction with respect to a camera head mount for fixing a lens so as to align the position of the image pickup plate with a focal point of the lens. An adjusting plate, which slides linearly in a state restricted only in the direction orthogonal to the optical axis, is arranged on a flat surface formed on the outer peripheral surface of the camera head mount, and the adjusting plate is arranged in a predetermined direction with the optical axis direction. While forming an inclined elongated hole having an angle, an elongated hole was formed in the camera head mount so as to intersect with the inclined elongated hole in the optical axis direction, and was inserted through the inclined elongated hole and the elongated hole. The guide member is fixed to a base to which the image pickup plate is fixed, and the adjusting plate is screwed to an adjusting screw attached to the camera head mount. Is moved to the base through the inner member in the optical axis direction, the back focus adjustment mechanism formed of a fixed and this base and the camera head mounted at a fixed screw.
JP14599588U 1988-11-10 1988-11-10 Back focus adjustment mechanism Expired - Lifetime JPH0753335Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14599588U JPH0753335Y2 (en) 1988-11-10 1988-11-10 Back focus adjustment mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14599588U JPH0753335Y2 (en) 1988-11-10 1988-11-10 Back focus adjustment mechanism

Publications (2)

Publication Number Publication Date
JPH0279672U JPH0279672U (en) 1990-06-19
JPH0753335Y2 true JPH0753335Y2 (en) 1995-12-06

Family

ID=31415079

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14599588U Expired - Lifetime JPH0753335Y2 (en) 1988-11-10 1988-11-10 Back focus adjustment mechanism

Country Status (1)

Country Link
JP (1) JPH0753335Y2 (en)

Also Published As

Publication number Publication date
JPH0279672U (en) 1990-06-19

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