JPH0446415U - - Google Patents
Info
- Publication number
- JPH0446415U JPH0446415U JP8784690U JP8784690U JPH0446415U JP H0446415 U JPH0446415 U JP H0446415U JP 8784690 U JP8784690 U JP 8784690U JP 8784690 U JP8784690 U JP 8784690U JP H0446415 U JPH0446415 U JP H0446415U
- Authority
- JP
- Japan
- Prior art keywords
- group
- holding frame
- lens group
- focal length
- group holding
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims 5
- 238000013459 approach Methods 0.000 claims 2
- 230000003287 optical effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 6
- 230000002265 prevention Effects 0.000 description 1
Landscapes
- Lens Barrels (AREA)
Description
第１図は、本考案に係る２群構成のズームレン
ズの全体構成を示す概略構成図、第２図は、本考
案の制御原理を説明するための原理説明図、第３
図は、被写体距離Ｄと前群レンズ群Ｌ１の移動量
ｘ１との関係を具現化した線図、第４図は、所望
の焦点距離ｆｉを実現するための２つのレンズ群
Ｌ１，Ｌ２の群間隔Ｇｉ、および、思考過程上の
焦点距離ｆｉ−１を実現するための２つのレンズ
群Ｌ１，Ｌ２の群間隔Ｇｉ−１を求めるためのｌ
−Ｇ制御線図、第５図は、後群保持枠１８の移動
制御を階段状の移動線図で行わせる場合の、フオ
ーカシング位置検出基板２３のスイツチパターン
２３ａの構造配置を示す部分平面図、第６図は、
後群保持枠１８の移動制御を階段状の移動線図ｄ
′で行う場合の作用説明図である。第７図は、第
１図に示す２群構成のズームレンズのマクロ撮影
時における後群レンズ群の移動制限の一例を示す
作用説明図、第８図および第９図は、いずれも第
１図に示す実施例の作動を説明するためのフロー
チヤート図、第１０図は、フオーカシング時にお
ける後群レンズ群の移動可能量と移動制限位置を
説明するための説明図である。第１１図は、フロ
ントフオーカシング方式を採る正・負配列の２群
ズームレンズの特徴を説明するための作用説明図
、第１２図は、フロントフオーカシング方式にお
ける従来のレンズ群保持枠の構造説明図である。
第１３図は、リアフオーカシング方式を採る正・
負配列の２群ズームレンズ特徴を説明するための
作用説明図、第１４図は、リアフオーカシング方
式における仮定的に考えたレンズ群保持枠の構造
説明図である。第１５図は、リアフオーカシング
方式を採る正・負配列タイプの２群ズームレンズ
における従来の後群レンズ群の移動線図を説明す
るための作用説明図である。
Ｌ１……前群レンズ群、Ｌ２……後群レンズ群
、Ｆ……フイルム面、Ｄ……被写体距離、ｆｉ…
…所望の焦点距離、ｆＴ……ＴＥＬＥ端の焦点距
離、ｆＷ……ＷＩＤＥ端の焦点距離、ｆｍ……Ｗ
ＩＤＥ端寄りの所定レベルの焦点距離、ｌ……フ
イルム面から前群レンズ群までの距離、ｘ１……
前群レンズ群のＬ１の仮想フオーカシング量、ｘ
２……後群レンズ群の補正移動量、ｆｉ−１……
思考過程上の焦点距離、Ｇｉ……所望の焦点距離
を実現し得る群間隔、Ｇｉ−１……ｆｉ−１を実
現し得る群間隔、ＳＴ……移動限界位置、Ｍｚ…
…ズームモータ、ＭＦ……フオーカスモータ、１
……鏡胴固定部、２……第１リードねじ、３……
第１リードねじギア、５……駆動出力ギア、６…
…旋回阻止バー、１０……前群保持枠、１１……
第１雌ねじカラー、１２……第２リードねじ、１
３……第２リードねじギア、１４……アイドルギ
ア、１５……駆動出力ギア、１６，１７……回転
数検出手段、１６……エンコーダ羽根、１６ａ…
…スリツト列、１７……フオトカプラー、１７ａ
……光電的検出部、１８……後群保持枠、１９…
…第２雌ねじカラー、２１……前群位置検出用パ
ターン基板、２２……ＭＲ素子、２３……フオー
カシング位置検出基板、２３ａ……スイツチパタ
ーン、Ｐ１，Ｐ２，Ｐ３……導電パターン、２４
……摺動ブラシ、３１……前群枠位置検出回路、
３２……ズームスイツチ手段、３３……シヤツタ
レリーズスイツチ手段、３４……制御回路、３５
……記憶手段、３６……自動測距装置、３７……
マクロ限界設定手段、３８……マクロ撮影選択ス
イツチ、３９……撮影限界警告手段。
FIG. 1 is a schematic configuration diagram showing the overall configuration of a two-group zoom lens according to the present invention, FIG. 2 is a principle explanatory diagram for explaining the control principle of the present invention, and FIG.
The figure is a diagram embodying the relationship between the object distance D and the movement amount x 1 of the front lens group L 1 , and FIG. 4 shows the relationship between the two lens groups L 1 , The group spacing Gi of L 2 and l for determining the group spacing Gi -1 of the two lens groups L 1 and L 2 to realize the focal length f i-1 in the thought process.
-G control diagram, FIG. 5 is a partial plan view showing the structural arrangement of the switch pattern 23a of the focusing position detection board 23 when the movement of the rear group holding frame 18 is controlled in a stepped movement diagram; Figure 6 shows
Stepwise movement diagram d for controlling the movement of the rear group holding frame 18
FIG. FIG. 7 is an explanatory diagram showing an example of movement restriction of the rear lens group during macro photography of the two-group zoom lens shown in FIG. 1, and FIG. 8 and FIG. FIG. 10 is a flowchart diagram for explaining the operation of the embodiment shown in FIG. 10, and is an explanatory diagram for explaining the movable amount and movement restriction position of the rear lens group during focusing. Fig. 11 is an explanatory diagram of the operation to explain the characteristics of a two-group zoom lens with a positive and negative arrangement that adopts the front focusing method, and Fig. 12 shows the conventional lens group holding frame in the front focusing method. It is a structural explanatory diagram.
Figure 13 shows the front view using the rear focusing method.
FIG. 14, which is an operational explanatory diagram for explaining the characteristics of a two-group zoom lens with a negative arrangement, is a structural explanatory diagram of a hypothetically considered lens group holding frame in a rear focusing system. FIG. 15 is an explanatory diagram illustrating a movement diagram of a conventional rear lens group in a positive/negative arrangement type two-group zoom lens employing a rear focusing method. L1 ...Front lens group, L2 ...Rear lens group, F...Film surface, D...Subject distance, fi...
…Desired focal length, fT…Focal length at TELE end, fW…Focal length at WIDE end, f m …W
Focal length at a predetermined level near the IDE end, l... Distance from the film surface to the front lens group, x 1 ...
Virtual focusing amount of L1 of the front lens group, x
2 ...Correction movement amount of the rear lens group, f i-1 ...
Focal length in thought process, Gi...Group spacing that can realize the desired focal length, G i-1 ...Group spacing that can realize fi -1 , ST...Movement limit position, Mz...
...Zoom motor, MF...Focus motor, 1
... Lens barrel fixing part, 2 ... First lead screw, 3 ...
First lead screw gear, 5... Drive output gear, 6...
...Turn prevention bar, 10...Front group holding frame, 11...
First female thread collar, 12...Second lead screw, 1
3... Second lead screw gear, 14... Idle gear, 15... Drive output gear, 16, 17... Rotation speed detection means, 16... Encoder blade, 16a...
...Slit row, 17...Photocoupler, 17a
...Photoelectric detection section, 18...Rear group holding frame, 19...
...Second female screw collar, 21...Front group position detection pattern board, 22...MR element, 23...Focusing position detection board, 23a...Switch pattern, P1 , P2 , P3 ...Conductive pattern, 24
...Sliding brush, 31...Front group frame position detection circuit,
32... Zoom switch means, 33... Shutter release switch means, 34... Control circuit, 35
...Storage means, 36...Automatic distance measuring device, 37...
Macro limit setting means, 38... Macro shooting selection switch, 39... Shooting limit warning means.
Claims (1)
ある後群レンズ群とを、被写界側から順次に配列
したリアフオーカシング方式の２群構成ズームレ
ンズにおいて、 前記前群レンズ群を保持し、ズーミングの際に
光軸に沿つて移動するように構成された前群保持
枠と、 前記後群レンズ群を保持し、ズーミングおよび
フオーカシングの際に、前記前群保持枠に対して
相対移動し得るように前記前群保持枠上に載置さ
れた後群保持枠と、 ズーミングの際に、前記前群レンズ群の軸上移
動位置を検出する前群枠位置検出手段と、 前記前群保持枠の軸上移動位置に基いてそのと
きの焦点距離を演算する焦点距離演算手段と、 投影時の被写体距離を自動的に測定する測距手
段と、 この測距手段からの測距情報と前記焦点距離演
算手段からの被写体距離情報とに基いて、通常撮
影時およびマクロ撮影時における、ズーミング時
およびフオーカシング時の前記後群保持枠の移動
量を演算する後群移動量演算手段と、 マクロ撮影時に、最短の焦点距離を含む広角端
側の所定焦点距離の領域においてフイルム面によ
り近く接近した後群保持枠の移動位置に設定され
る移動限界位置を越えて後群保持枠が、フイルム
面に接近するのを阻止する後群移動量制御手段と
、 マクロ撮影時において、後群保持枠が前記移動
限界位置に位置しているときに対応する撮影距離
よりも近い距離に被写体が位置しているときに、
前記測距手段からの測距情報に基いてこの状態を
検知し、しかも、検知したときにマクロ撮影不可
能信号を発生するマクロ撮影警告手段とから成る
ことを特徴とするマクロ撮影可能な２群構成ズー
ムレンズ。[Scope of Claim for Utility Model Registration] A rear focusing two-group zoom lens in which a front lens group, which is a positive lens group, and a rear lens group, which is a negative lens group, are arranged sequentially from the object side. A front group holding frame configured to hold the front lens group and move along the optical axis during zooming; and a front group holding frame configured to hold the rear lens group and move the front lens group during zooming and focusing. a rear group holding frame placed on the front group holding frame so as to be movable relative to the front group holding frame; and a front group detecting the axial movement position of the front lens group during zooming. a frame position detection means; a focal length calculation means for calculating a focal length at that time based on the axial movement position of the front group holding frame; a distance measurement means for automatically measuring a subject distance during projection; Based on the distance measurement information from the distance measurement means and the subject distance information from the focal length calculation means, the amount of movement of the rear group holding frame during zooming and focusing during normal shooting and macro shooting is calculated. The rear group movement amount calculating means and the rear group movement amount calculating means exceed the movement limit position set at the movement position of the rear group holding frame that approaches the film surface closer to the film surface in a predetermined focal length area on the wide-angle end side including the shortest focal length during macro shooting. a rear group movement amount control means for preventing the rear group holding frame from approaching the film surface when the rear group holding frame approaches the film surface; When the subject is located at a close distance,
A second group capable of macro photography, comprising a macro photography warning means that detects this state based on distance measurement information from the distance measurement means and generates a macro photography impossible signal when detected. Composition zoom lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8784690U JPH0446415U (en) | 1990-08-24 | 1990-08-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8784690U JPH0446415U (en) | 1990-08-24 | 1990-08-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0446415U true JPH0446415U (en) | 1992-04-20 |
Family
ID=31820559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8784690U Pending JPH0446415U (en) | 1990-08-24 | 1990-08-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0446415U (en) |
-
1990
- 1990-08-24 JP JP8784690U patent/JPH0446415U/ja active Pending
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