JPH0511547Y2 - - Google Patents
Info
- Publication number
- JPH0511547Y2 JPH0511547Y2 JP1983018818U JP1881883U JPH0511547Y2 JP H0511547 Y2 JPH0511547 Y2 JP H0511547Y2 JP 1983018818 U JP1983018818 U JP 1983018818U JP 1881883 U JP1881883 U JP 1881883U JP H0511547 Y2 JPH0511547 Y2 JP H0511547Y2
- Authority
- JP
- Japan
- Prior art keywords
- lens
- interchangeable lens
- video camera
- interchangeable
- autofocus
- 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
Links
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 230000003287 optical effect Effects 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 7
- 230000004907 flux Effects 0.000 description 3
- 230000001771 impaired effect Effects 0.000 description 3
- 230000011514 reflex Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Landscapes
- Viewfinders (AREA)
- Structure And Mechanism Of Cameras (AREA)
Description
【考案の詳細な説明】
「技術分野」
本考案は、ビデオカメラのボデイと交換レンズ
との間に装着して使用するレンズマウント変換ア
ダプタに関する。[Detailed Description of the Invention] [Technical Field] The present invention relates to a lens mount conversion adapter that is used by being attached between the body of a video camera and an interchangeable lens.
「従来技術およびその問題点」
最近ビデオカメラの普及に伴ない、レンズ交換
を可能としたビデオカメラも市場に出始めてい
る。このレンズ交換式ビデオカメラに、例えば一
眼レフカメラ用の豊富な交換レンズを装着するに
は、両者のマウントを一致させると同時に、カメ
ラボデイのフランジバツクと、交換レンズのフラ
ンジバツクを一致させなければならず、このため
レンズマウント交換アダプタが使用される。"Prior Art and its Problems" Recently, with the spread of video cameras, video cameras with interchangeable lenses have started to appear on the market. In order to attach a variety of interchangeable lenses, such as those for single-lens reflex cameras, to this interchangeable lens video camera, you must match the mounts of both cameras, and at the same time match the flange back of the camera body with the flange back of the interchangeable lens. Therefore, a lens mount exchange adapter is used.
このようにスチルカメラ用の交換レンズをアダ
プタを用いてビデオカメラに使用すると、両者の
画面寸法の相違からかなり望遠な撮影画像とな
り、現存するビデオ用の交換レンズでは実現不可
能な数千mmというような超望遠なども可能となる
ため、ビデオカメラの使用領域は大幅に拡がるも
のと期待されている。 When an interchangeable lens for a still camera is used with a video camera using an adapter, the resulting image will be quite telephoto due to the difference in screen dimensions between the two, resulting in a distance of several thousand mm, which is impossible to achieve with existing interchangeable lenses for video. As it becomes possible to use super-telephoto lenses, the range of uses for video cameras is expected to expand significantly.
ところで、撮影レンズの被写界深度は、周知の
ように、焦点距離が長くなる程浅くなる。このた
め上記のような超望遠の撮影レンズでは被写界深
度が極めて浅くなり、手動によるピント合せが困
難になる。このため動く被写体を追つている場合
などにはスムーズなピント合せが殆ど困難とな
り、また手動でピント合せを行なうと、手振れが
拡大されて画像が大きくぶれる結果となる。この
傾向は焦点距離が長くなる程著しい。 By the way, as is well known, the depth of field of a photographic lens becomes shallower as the focal length becomes longer. For this reason, the depth of field of a super-telephoto shooting lens such as the one described above becomes extremely shallow, making manual focusing difficult. For this reason, it is almost difficult to achieve smooth focusing when tracking a moving subject, and if manual focusing is performed, camera shake will be magnified and the image will be significantly blurred. This tendency becomes more pronounced as the focal length becomes longer.
「考案の目的」
本考案は、このような問題意識に基づいてなさ
れたもので、撮影レンズの光学特性を損なうこと
なくフランジバツクの調整が可能で、しかもオー
トフオーカスが可能なビデオカメラ用レンズマウ
ント変換アダプタを提供することを目的とする。``Purpose of the invention'' This invention was created based on this awareness of the problem, and is a video camera lens that allows adjustment of the flange back without impairing the optical characteristics of the photographic lens, and that also allows autofocus. The purpose is to provide a mount conversion adapter.
「考案の概要」
この目的を達成するため本考案は、ビデオカメ
ラのボデイのフランジバツクと、交換レンズのフ
ランジバツクの差を補つて、該ボデイと交換レン
ズとを接続するビデオカメラ用レンズマウント変
換アダプタにおいて、上記レンズマウント変換ア
ダプタ自体に、交換レンズによる被写体光束の一
部を撮影光路外に導いて焦点状態を検出する焦点
検出制御系と、この焦点検出制御系の出力により
作動して、上記交換レンズ自体を光軸方向に前後
動させる駆動系とを備えたオートフオーカス機構
を搭載したことを特徴としている。"Summary of the invention" In order to achieve this purpose, the present invention is a video camera lens mount conversion system that compensates for the difference between the flange back of the video camera body and the flange back of the interchangeable lens, and connects the body and the interchangeable lens. In the adapter, the lens mount conversion adapter itself includes a focus detection control system that guides a part of the subject light flux from the interchangeable lens out of the photographing optical path and detects the focus state, and is operated by the output of this focus detection control system. It is characterized by being equipped with an autofocus mechanism that includes a drive system that moves the interchangeable lens itself back and forth in the optical axis direction.
この構成からなる本ビデオカメラ用レンズマウ
ント変換アダプタによれば、撮影レンズのフラン
ジバツクとカメラボデイのフランジバツクの差の
調節を可能とするだけでなく、オートフオーカス
機構によりオートフオーカスを可能にし、しかも
撮影レンズの光学特性を損なうことがない。 This video camera lens mount conversion adapter with this configuration not only makes it possible to adjust the difference between the flange back of the shooting lens and the flange back of the camera body, but also enables autofocus with the autofocus mechanism. Moreover, the optical characteristics of the photographic lens are not impaired.
「考案の実施例」
以下図示実施例について本考案を説明する。第
１図は本考案の第一の実施例を示すもので、１１
はビデオカメラのボデイ、１２はこのボデイ１１
に装着される交換レンズである。この交換レンズ
１２は、例えば35mm一眼レフ用の交換レンズを使
用するもので、そのマウントおよびフランジバツ
クはボデイ１１のこれらとは当然異なるため、両
者の間にレンズマウント交換アダプタ１３が挿入
されている。すなわちこのレンズマウント変換ア
ダプタ１３は、ボデイ１１のマウント面から
CCD等の撮像素子１４迄のフランジバツクb1と、
交換レンズ１２のマウント面から撮像素子１４迄
のフランジバツクb2との差を補つて、ボデイ１１
と交換レンズ１２を接続する作用をする。``Embodiments of the invention'' The invention will be described below with reference to illustrated embodiments. FIG. 1 shows the first embodiment of the present invention, 11
is the body of the video camera, 12 is this body 11
This is an interchangeable lens that is attached to the camera. This interchangeable lens 12 uses, for example, an interchangeable lens for a 35 mm single-lens reflex camera, and since its mount and flange back are naturally different from those of the body 11, a lens mount exchange adapter 13 is inserted between the two. . In other words, this lens mount conversion adapter 13
Flange back b 1 up to the image sensor 14 such as CCD,
The body 11 is adjusted to compensate for the difference in flange back b2 from the mounting surface of the interchangeable lens 12 to the image sensor 14.
and the interchangeable lens 12.
レンズマウント変換アダプタ１３の前端部の交
換レンズ１２の取付部１５は、周知のヘリコイド
機構等により光軸方向に移動可能に構成されてお
り、駆動ギヤ１６をモータ１７で回転駆動する
と、該取付部１５が前後動する。他方レンズマウ
ント変換アダプタ１３内の光軸上には、交換レン
ズ１２により形成される撮像光束の一部を反射さ
せるハーフミラー１８が配設され、このハーフミ
ラー１８で反射した光束はオートフオーカスセン
サ１９に与えられる。 The attachment part 15 of the interchangeable lens 12 at the front end of the lens mount conversion adapter 13 is configured to be movable in the optical axis direction by a well-known helicoid mechanism, etc., and when the drive gear 16 is rotationally driven by the motor 17, the attachment part 15 moves back and forth. On the other hand, on the optical axis inside the lens mount conversion adapter 13, a half mirror 18 is arranged to reflect a part of the imaging light flux formed by the interchangeable lens 12, and the light flux reflected by this half mirror 18 is sent to the autofocus sensor. given to 19.
オートフオーカスセンサ１９は、撮像素子１４
と共役の位置にあり、その出力は焦点検出回路２
０に入力される。焦点検出回路２０はモータ駆動
回路２１に対し、焦点状態に応じた出力を出し、
上記モータ１７が駆動ギヤ１６を介し取付部１５
を、すなわち交換レンズ１２を前後動させる。 The autofocus sensor 19 is the image sensor 14
and its output is the focus detection circuit 2.
It is input to 0. The focus detection circuit 20 outputs an output according to the focus state to the motor drive circuit 21,
The motor 17 is connected to the mounting portion 15 through the drive gear 16.
That is, the interchangeable lens 12 is moved back and forth.
上記構成の本オートフオーカス装置のフイード
バツク系は、オートフオーカススイツチ２２をオ
ンにすることにより作動し、交換レンズ１２によ
る像が正しく撮像素子１４上に結ぶように、モー
タ駆動回路２１がモータ１７に正逆の回転信号を
与える。すなわち、交換レンズ１２による像が合
焦状態となるように取付部１５が移動し、オート
フオーカスがなされる。したがつて、交換レンズ
１２が超望遠レンズであるか否を問わず、本考案
のレンズマウント変換アダプタ１３を用いること
により、オートフオーカス機能が得られ、しかも
交換レンズ１２を焦点距離の異なるものに交換し
ても、全く同様にオートフオーカスができるとい
う効果が得られる。 The feedback system of this autofocus device having the above configuration is activated by turning on the autofocus switch 22, and the motor drive circuit 21 drives the motor 17 so that the image formed by the interchangeable lens 12 is correctly focused on the image sensor 14. Gives forward and reverse rotation signals to. That is, the attachment portion 15 moves so that the image formed by the interchangeable lens 12 is brought into focus, and autofocus is performed. Therefore, regardless of whether the interchangeable lens 12 is a super-telephoto lens or not, by using the lens mount conversion adapter 13 of the present invention, an autofocus function can be obtained. Even if you replace it with , you can still get the same autofocus effect.
しかも本考案では、撮影レンズとカメラボデイ
との間に全くレンズを介在させないので、撮影レ
ンズの光学特性を損なうことがなく、加えて構造
が簡単である。 Moreover, in the present invention, since no lens is interposed between the photographic lens and the camera body, the optical characteristics of the photographic lens are not impaired, and in addition, the structure is simple.
以上の説明から明らかなように、レンズマウン
ト変換アダプタ１３に搭載したオートフオーカス
機構は、交換レンズ１２の焦点調整機構の代用を
するものであるから、交換レンズ１２は取付部１
５への装着時に、無限遠撮影状態にセツトしてお
くのが通常の用い方である。 As is clear from the above explanation, the autofocus mechanism mounted on the lens mount conversion adapter 13 is intended to substitute for the focus adjustment mechanism of the interchangeable lens 12, so the interchangeable lens 12 is attached to the mounting section 1.
Normally, when the camera is attached to the camera, it is set to the infinity shooting state.
「考案の効果」
以上のように本考案は、スチルカメラ等の交換
レンズを、ビデオカメラに対して装着できるよう
にするレンズマウント変換アダプタに、オートフ
オーカス機構を内蔵させたから、特に被写界深度
の浅くなる超望遠レンズの使用が容易になるとと
もに、手動によるピント合わせに伴なう手振れの
可能性が減り、また種類の豊富なスチルカメラの
交換レンズをすべてオートフオーカスレンズとし
て使用できるため、ビデオカメラの使用領域、範
囲を増大させ、初心者から熱練者までの広範な使
用を可能とすることができる。``Effects of the invention'' As described above, this invention incorporates an autofocus mechanism into the lens mount conversion adapter that allows an interchangeable lens such as a still camera to be attached to a video camera. This makes it easier to use super-telephoto lenses with shallow depth of field, reduces the possibility of camera shake caused by manual focusing, and allows all of a wide variety of still camera interchangeable lenses to be used as autofocus lenses. , it is possible to increase the use area and range of the video camera, and to enable a wide range of uses from beginners to experts.
しかも本考案のレンズマウント変換アダプタ
は、撮影に関与するレンズ等を一切使用していな
いので、どの撮影レンズを使用しても、その光学
特性を損なうことがなく、構造も簡単になる。 Moreover, since the lens mount conversion adapter of the present invention does not use any lenses involved in photographing, no matter which photographic lens is used, its optical characteristics will not be impaired and the structure will be simple.
第１図は、本考案の実施例を示す系統的接続図
である。
１１……ボデイ、１２……交換レンズ、１３…
…レンズマウント変換アダプタ、１４……撮像素
子、１５……取付部、１６……駆動ギヤ、１７…
…モータ、１８……ハーフミラー、１９……オー
トフオーカスセンサ、２０……焦点検出回路、２
１……モータ駆動回路、２２……オートフオーカ
ススイツチ。
FIG. 1 is a systematic connection diagram showing an embodiment of the present invention. 11...Body, 12...Interchangeable lens, 13...
...Lens mount conversion adapter, 14...Image sensor, 15...Mounting section, 16...Drive gear, 17...
... Motor, 18 ... Half mirror, 19 ... Auto focus sensor, 20 ... Focus detection circuit, 2
1...Motor drive circuit, 22...Auto focus switch.
Claims (1)
換レンズのフランジバツクの差を補つて、該ボデ
イと交換レンズとを接続するビデオカメラ用レン
ズマウント交換アダプタであつて、 該アダプタに、上記交換レンズによる被写体光
束の一部を撮影光路外に導いて焦点状態を検出す
る焦点検出制御系と、この焦点検出制御系の出力
により作動して、上記交換レンズ自体を光軸方向
に前後動させる駆動系とを備えたオートフオーカ
ス機構を内蔵させたこと、 を特徴とするビデオカメラ用レンズマウント変換
アダプタ。[Utility Model Registration Claim] A lens mount conversion adapter for a video camera that connects the body of a video camera to an interchangeable lens by compensating for the difference between the flange back of the body of the video camera and the flange back of the interchangeable lens, characterized in that the adapter has a built-in autofocus mechanism that includes a focus detection control system that detects the focus state by directing a portion of the subject light beam from the interchangeable lens out of the photographing optical path, and a drive system that is operated by the output of the focus detection control system to move the interchangeable lens itself back and forth in the optical axis direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1983018818U JPS59123849U (en) | 1983-02-10 | 1983-02-10 | Video camera lens mount conversion adapter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1983018818U JPS59123849U (en) | 1983-02-10 | 1983-02-10 | Video camera lens mount conversion adapter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59123849U JPS59123849U (en) | 1984-08-21 |
| JPH0511547Y2 true JPH0511547Y2 (en) | 1993-03-23 |
Family
ID=30149992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1983018818U Granted JPS59123849U (en) | 1983-02-10 | 1983-02-10 | Video camera lens mount conversion adapter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59123849U (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008046415A (en) * | 2006-08-17 | 2008-02-28 | Fujinon Corp | Lens device |
| JP2012042773A (en) * | 2010-08-20 | 2012-03-01 | Sony Corp | Mounting adapter and imaging device |
| JP2012137600A (en) * | 2010-12-27 | 2012-07-19 | Sony Corp | Imaging system, imaging device, and program |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5428133A (en) * | 1977-08-04 | 1979-03-02 | Canon Inc | Optical path extension device with focus detection function |
| JPS5611042U (en) * | 1979-07-04 | 1981-01-30 |
-
1983
- 1983-02-10 JP JP1983018818U patent/JPS59123849U/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5428133A (en) * | 1977-08-04 | 1979-03-02 | Canon Inc | Optical path extension device with focus detection function |
| JPS5611042U (en) * | 1979-07-04 | 1981-01-30 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59123849U (en) | 1984-08-21 |
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