JPH05103255A - Focus correcting mechanism for lens device - Google Patents
Focus correcting mechanism for lens deviceInfo
- Publication number
- JPH05103255A JPH05103255A JP3289458A JP28945891A JPH05103255A JP H05103255 A JPH05103255 A JP H05103255A JP 3289458 A JP3289458 A JP 3289458A JP 28945891 A JP28945891 A JP 28945891A JP H05103255 A JPH05103255 A JP H05103255A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- temperature
- correction
- signal
- detected
- 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.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 claims description 13
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Landscapes
- Lens Barrels (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、屋外撮影用のテレビカ
メラ等におけるレンズ装置に関し、特にこのレンズ装置
の温度変化による結像位置のずれを補正するためのレン
ズ装置のピント補正機構に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens device in a television camera or the like for outdoor shooting, and more particularly to a focus correction mechanism of the lens device for correcting a deviation of an image forming position due to a temperature change of the lens device. is there.
【０００２】[0002]
【従来の技術】例えば、テレビカメラは、カメラ本体に
レンズ装置を接続することにより構成されるが、このレ
ンズ装置におけるレンズ系は、複数枚のレンズから構成
され、これら各レンズは、筺体としてのレンズ鏡胴内に
おいて、それぞれ所定の位置関係となるようにして組み
込まれて、レンズ鏡胴に装着したレンズ支持部材に支持
されている。ここで、このようなレンズ装置を構成する
各レンズは所定の位置関係となるように、予め正確に調
整されるようになっている。2. Description of the Related Art For example, a television camera is constructed by connecting a lens device to a camera body. The lens system in this lens device is made up of a plurality of lenses, and each of these lenses serves as a housing. The lenses are incorporated in the lens barrel so as to have a predetermined positional relationship, and are supported by a lens support member mounted on the lens barrel. Here, each lens that constitutes such a lens device is accurately adjusted in advance so as to have a predetermined positional relationship.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、前述し
たレンズ鏡胴及びレンズ支持部材は、一般に、金属等の
部材で形成されており、このために熱の影響を受けて変
形するおそれがある。従って、たとえ予めレンズの位置
調整が行われていたとしても、その調整は常温状態での
調整であり、熱の影響を受けると結像位置が変化して、
ピントずれが生じるおそれがあると共に、ガラスあるい
はプラスチック等からなるレンズもまた熱の影響を受け
て、変形して曲率が変化するおそれがある。特に、屋外
において撮影されるものにあっては、使用場所や条件に
より温度が著しく異なることがあり、レンズ，レンズ鏡
胴，レンズ支持部材等の熱変形に起因して生じるピント
ずれはかなり大きい。However, since the lens barrel and the lens supporting member described above are generally formed of a member such as a metal, there is a possibility that they will be deformed under the influence of heat. Therefore, even if the position of the lens has been adjusted in advance, the adjustment is performed at room temperature, and the image formation position changes when affected by heat,
The lens may be out of focus, and the lens made of glass, plastic, or the like may be affected by heat and may be deformed to change the curvature. In particular, in an image taken outdoors, the temperature may remarkably change depending on the place of use and conditions, and the focus shift caused by thermal deformation of the lens, lens barrel, lens support member, etc. is quite large.
【０００４】本発明はこのような従来技術の持つ欠点や
課題を解決するためになされたもので、その目的とする
ところは、温度変化があっても、結像位置が変化しない
ように補正することができるレンズ装置のピント補正機
構を提供することにある。The present invention has been made in order to solve the drawbacks and problems of the prior art, and its purpose is to make a correction so that the imaging position does not change even if the temperature changes. An object of the present invention is to provide a focus correction mechanism for a lens device.
【０００５】[0005]
【課題を解決するための手段】前述した目的を達成する
ために、光学系を構成する複数のレンズのうち、少なく
とも１つのレンズを温度変化によるピント補正用のレン
ズとなし、この光学系が装着されている筺体の内部に１
乃至数箇所温度センサを設けて、温度に対応して前記ピ
ント補正用レンズの位置を調整するために、温度に対す
るピント補正用レンズの位置に関するデータが設定され
た補正データ設定手段と、前記温度センサで検出した温
度信号に基づいて、前記補正データ設定手段から当該温
度における前記ピント補正用レンズの位置を割り出し、
これとピント補正用レンズの現在位置信号とから、この
補正用レンズの移動量を演算する補正量演算回路とを設
け、この補正量演算回路からの出力信号に基づいて、前
記ピント補正用レンズを、温度変化に対応して結像位置
を一定に保つ位置に変位させる構成としたことをその特
徴とするものである。In order to achieve the above-mentioned object, at least one lens of a plurality of lenses constituting an optical system is used as a lens for focus correction due to temperature change, and this optical system is mounted. 1 inside the enclosure
A temperature sensor is provided at several positions, and correction data setting means in which data relating to the position of the focus correction lens with respect to temperature is set in order to adjust the position of the focus correction lens according to the temperature, and the temperature sensor. The position of the focus correction lens at the temperature is determined from the correction data setting means based on the temperature signal detected by
A correction amount calculation circuit that calculates the amount of movement of the correction lens from this and the current position signal of the focus correction lens is provided, and the focus correction lens is determined based on the output signal from the correction amount calculation circuit. The feature is that the image-forming position is displaced to a position that keeps it constant according to the temperature change.
【０００６】[0006]
【作用】まず、レンズ装置を構成するいずれかのレン
ズ、例えばリレーレンズ等をピント補正用のレンズとし
て設定する。そして、レンズ装置に温度変化があったと
きに、このピント補正用として設定されたレンズを光軸
に沿ってどの方向にどの程度移動させれば、結像位置の
変化が補正されてピントが合うことになるかを予め計算
または実験値により求めておき、この値を補正データ設
定手段に記録しておく。これによって、たとえ屋外にお
いて、季節や撮影場所等に応じて、温度が著しく変化し
ても、この温度変化を温度センサにより検出して、この
検出信号における補正データを補正データ設定手段から
読み出して、ピント補正用レンズの位置が割り出され
る。これと共に、このピント補正用レンズの現在位置を
検出して、補正量演算回路によってこのレンズの移動方
向及び移動量からなる補正用レンズ移動信号を演算し
て、この信号をレンズ駆動回路に入力する。これによっ
て、当該の温度条件における最適な位置にピント補正用
レンズが移動して、結像位置が一定に保たれる。First, one of the lenses constituting the lens device, for example, a relay lens is set as a lens for focus correction. Then, when the temperature of the lens device changes, by moving the lens set for focus correction in which direction along the optical axis and to what extent, the change in the imaging position is corrected and the focus is achieved. It is calculated beforehand or obtained by an experimental value, and this value is recorded in the correction data setting means. As a result, even if the temperature changes significantly outdoors, depending on the season, shooting location, etc., this temperature change is detected by the temperature sensor, and the correction data in this detection signal is read from the correction data setting means, The position of the focus correction lens is calculated. Along with this, the current position of the focus correction lens is detected, a correction lens movement signal including the movement direction and movement amount of the lens is calculated by the correction amount calculation circuit, and this signal is input to the lens drive circuit. .. As a result, the focus correction lens moves to an optimum position under the temperature condition, and the image forming position is kept constant.
【０００７】[0007]
【実施例】以下、本発明の実施例を図面に基づいて詳細
に説明する。図１にレンズ装置の概略構造を例示する。
図中において、１はレンズ鏡胴を示し、このレンズ鏡胴
１内には結像用の光学系２が内蔵されている。この光学
系２は、複数枚のレンズからなり、これら各レンズの一
つとしてリレーレンズ２ａが設けられている。本実施例
においては、このリレーレンズ２ａをピント補正用レン
ズとして用いるようにしているが、温度変化に基づく結
像位置のずれを防止するためのものであるから、このリ
レーレンズ２ａ以外の適宜のレンズにこの機能を持たせ
ることも可能である。ただし、制御性を考慮して、ピン
ト補正用レンズは１枚のアセンブリレンズで構成するの
が好ましい。Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 illustrates a schematic structure of the lens device.
In the figure, reference numeral 1 denotes a lens barrel, and an optical system 2 for image formation is built in the lens barrel 1. The optical system 2 is composed of a plurality of lenses, and a relay lens 2a is provided as one of these lenses. In this embodiment, the relay lens 2a is used as a focus correction lens, but since it is for preventing the shift of the image forming position due to the temperature change, an appropriate other than the relay lens 2a is used. It is also possible for the lens to have this function. However, in consideration of controllability, it is preferable that the focus correction lens is composed of one assembly lens.
【０００８】リレーレンズ２ａは、モータ３により駆動
されて、他のレンズと独立して光軸方向に移動させるこ
とができるようになっている。また、このリレーレンズ
２ａにはポテンショメータ等からなるレンズ位置検出手
段４が接続されている。このリレーレンズ２ａは像を結
像すると共に、前述したように、レンズ装置の温度変化
によって変動する結像位置の補正を行うためのものであ
って、このために、レンズ装置にはレンズ鏡胴１の内部
の温度を検出するための温度センサ５が設けられてい
る。この温度センサ５は、一般に、レンズ鏡胴１内のう
ち温度変化に最も敏感な部位、例えばレンズ鏡胴１の光
軸方向の略中間部分の内面に設置されている。また、こ
のレンズ鏡胴１内の温度センサ５に加えて、レンズ鏡胴
１の外部にも外部温度センサ６が設置されている。The relay lens 2a is driven by the motor 3 and can be moved independently of the other lenses in the optical axis direction. Further, a lens position detecting means 4 such as a potentiometer is connected to the relay lens 2a. The relay lens 2a forms an image and, as described above, corrects the image forming position that fluctuates due to the temperature change of the lens device. For this reason, the lens device has a lens barrel. A temperature sensor 5 for detecting the temperature inside 1 is provided. The temperature sensor 5 is generally installed on a portion of the lens barrel 1 that is most sensitive to temperature changes, for example, on the inner surface of a substantially middle portion of the lens barrel 1 in the optical axis direction. In addition to the temperature sensor 5 inside the lens barrel 1, an external temperature sensor 6 is installed outside the lens barrel 1.
【０００９】温度センサ５からの検出内部温度信号は、
外部温度センサ６からの外部温度検出信号と共に、温度
補正回路１０に入力されるようになっている。そして、
この温度補正回路１０で内外温度差による補正が行われ
た検出温度に関する信号は、補正量演算回路１１に入力
されるようになっている。この補正量演算回路１１に
は、温度変化に応じて、結像位置を一定に保つためのリ
レーレンズ２ａの位置に関するデータが設定されている
補正データ設定手段１２が接続されている。従って、温
度センサ５による温度検出信号によって補正データ設定
手段１２から、リレーレンズ２ａの位置が検出される。The detected internal temperature signal from the temperature sensor 5 is
The temperature correction circuit 10 inputs the external temperature detection signal from the external temperature sensor 6. And
A signal related to the detected temperature corrected by the difference between the inside temperature and the outside temperature in the temperature correction circuit 10 is input to the correction amount calculation circuit 11. The correction amount calculation circuit 11 is connected to a correction data setting means 12 in which data regarding the position of the relay lens 2a for keeping the image forming position constant according to the temperature change is set. Therefore, the position of the relay lens 2a is detected from the correction data setting means 12 by the temperature detection signal from the temperature sensor 5.
【００１０】以上のようにして決定されるリレーレンズ
２ａの位置は、レンズ位置検出手段４からの現在のレン
ズ位置に関する信号と比較手段１３で比較することによ
って、このリレーレンズ２ａの移動方向及び移動量が算
出される。そして、この信号はモータ３の動作制御を行
うレンズ駆動回路１４に入力されて、モータ３が作動し
て、リレーレンズ２ａが当該の温度状態でピントが合う
位置に移動せしめられるように構成されている。The position of the relay lens 2a determined as described above is compared with a signal relating to the current lens position from the lens position detection means 4 by the comparison means 13 to determine the moving direction and movement of the relay lens 2a. The amount is calculated. Then, this signal is input to the lens drive circuit 14 that controls the operation of the motor 3 so that the motor 3 operates and the relay lens 2a is moved to a position in focus in the temperature state. There is.
【００１１】このような構成を採用することによって、
常温で調整されている光学系２の各レンズの位置が、温
度上昇でレンズ２，レンズ鏡胴１やこのレンズ鏡胴１に
レンズを支持させるための各部材が熱膨張したり、また
温度低下によってこれらの部材が熱収縮したとしても、
リレーレンズ２ａがこの熱変形に応じて位置の調整が行
われて、結像位置を常に一定の位置とすることができ、
もって確実にピント合せを行うことができるようにな
る。By adopting such a configuration,
When the temperature of each lens of the optical system 2 is adjusted at room temperature, the temperature of the lens 2, the lens barrel 1 and each member for supporting the lens on the lens barrel 1 are thermally expanded or the temperature is lowered. Even if these components heat-shrink due to
The position of the relay lens 2a is adjusted according to this thermal deformation, so that the image forming position can be always kept at a fixed position.
Therefore, it becomes possible to reliably focus.
【００１２】即ち、レンズ鏡胴１の内部に温度変化があ
ると、そのときの温度が温度センサ５により検出され
て、温度補正回路１０において、外部温度センサ６から
の検出外部温度信号によって補正された上で、この温度
検出信号が補正量演算回路１１に入力されて、補正デー
タ設定手段１２に記録されている補正データから当該の
温度におけるリレーレンズ２ａの位置が割り出される。
ここで、レンズ鏡胴１の内外の温度差が著しく大きい場
合には、内部温度は徐々に外部温度に近づくように変化
するが、この内部温度の上昇変化過程でリレーレンズ２
ａの位置がずれるので、内部温度と外部温度との差によ
り補正量を調整するようにしている。ただし、内外温度
差が極端に出ないものであれば、外部温度センサ６及び
温度補正回路１０を設けず、温度センサ５によって検出
された温度信号をそのまま補正量演算回路１１に入力す
るようにしてもよい。また、補正データ設定手段１２に
は、レンズ鏡胴１その他の部材の材質等に基づいて、予
め計算されるか、または実験値によって、ピント補正用
のレンズとして機能するリレーレンズ２ａの位置と温度
との関係に関する補正データが記憶されており、この補
正データを読み出すことにより当該の温度状態における
リレーレンズ２ａの位置が演算される。That is, when there is a temperature change inside the lens barrel 1, the temperature at that time is detected by the temperature sensor 5 and is corrected in the temperature correction circuit 10 by the detected external temperature signal from the external temperature sensor 6. Then, this temperature detection signal is input to the correction amount calculation circuit 11, and the position of the relay lens 2a at the relevant temperature is calculated from the correction data recorded in the correction data setting means 12.
Here, when the temperature difference between the inside and outside of the lens barrel 1 is extremely large, the internal temperature gradually changes so as to approach the external temperature.
Since the position of a shifts, the correction amount is adjusted according to the difference between the internal temperature and the external temperature. However, if the inside / outside temperature difference is not extremely generated, the external temperature sensor 6 and the temperature correction circuit 10 are not provided, and the temperature signal detected by the temperature sensor 5 is directly input to the correction amount calculation circuit 11. Good. Further, the correction data setting means 12 calculates the position and temperature of the relay lens 2a which functions as a lens for focus correction, which is calculated in advance based on the material of the lens barrel 1 and other members, or based on experimental values. The correction data relating to the relationship with is stored, and the position of the relay lens 2a in the relevant temperature state is calculated by reading this correction data.
【００１３】このリレーレンズ２ａの位置に関する信号
は、比較手段１３に入力されて、レンズ位置検出手段４
からのリレーレンズ２ａの現在位置の信号と比較され
る。そして、この比較の結果、レンズ駆動信号が比較手
段１３がレンズ駆動回路１４に出力されて、この信号に
基づいてモータ３が作動して、リレーレンズ２ａが当該
の温度状態で最も適切な位置に移行せしめられる。この
結果、温度状態がどのようになっていても、常に一定の
結像位置となる。The signal relating to the position of the relay lens 2a is input to the comparing means 13 and the lens position detecting means 4 is supplied.
From the signal of the current position of the relay lens 2a. Then, as a result of this comparison, the lens driving signal is output to the lens driving circuit 14 by the comparing means 13, the motor 3 is operated based on this signal, and the relay lens 2a is at the most appropriate position in the temperature state. It can be moved. As a result, the imaging position is always constant regardless of the temperature condition.
【００１４】さらに、レンズ鏡胴１内に設けられる温度
センサは１個だけでなく、複数個の温度センサ５´，５
´，・・・をそれぞれ位置を違えて配設することもでき
る。この場合には、図２に示したように、補正量演算回
路１１に温度検出信号を入力する前に、各温度センサ５
´の検出温度信号の平均値を平均値回路１５により求め
て、この平均温度に関する信号を補正量演算回路１１に
入力するように構成すればよい。なお、この補正量演算
回路１１以降の信号処理は第１の実施例と同様であるの
で、それと同一または均等なものに同一の符号を付して
その説明は省略する。Further, the temperature sensor provided in the lens barrel 1 is not limited to one, but a plurality of temperature sensors 5 ', 5'.
It is also possible to arrange the positions', ... at different positions. In this case, as shown in FIG. 2, before inputting the temperature detection signal to the correction amount calculation circuit 11, each temperature sensor 5
The average value circuit 15 may obtain the average value of the detected temperature signal and the signal related to the average temperature may be input to the correction amount calculation circuit 11. Since the signal processing after the correction amount calculation circuit 11 is the same as that of the first embodiment, the same or equivalent components will be designated by the same reference numerals and the description thereof will be omitted.
【００１５】[0015]
【発明の効果】以上説明したように、本発明は、光学系
が装着されている筺体の内部に、１乃至数箇所温度セン
サを設けて、ピント補正用レンズの温度に対する位置の
データが設定された補正データ設定手段によりこの温度
センサからの検出温度信号に基づいて、前記補正データ
設定手段からピント補正用レンズの変位量を割り出し
て、これとピント補正用レンズの現在位置信号とから、
この補正用レンズの移動量を検出して、レンズ駆動回路
に補正用レンズ移動信号を出力するように構成したの
で、初期的に調整された光学系が、この調整時と異なる
温度条件下で用いたときに、結像位置が変動してピント
が合わなくなる等といった不都合を防止することがで
き、低温下で撮影する場合においても、また高温下で撮
影する場合であっても、共に良好な画質の撮影が可能と
なる。As described above, according to the present invention, one or several temperature sensors are provided inside the housing in which the optical system is mounted to set the position data with respect to the temperature of the focus correction lens. Based on the detected temperature signal from the temperature sensor by the correction data setting means, the displacement amount of the focus correction lens is calculated from the correction data setting means, and from this and the current position signal of the focus correction lens,
Since the correction lens movement signal is output to the lens drive circuit by detecting the amount of movement of the correction lens, the initially adjusted optical system can be used under different temperature conditions from this adjustment. In this case, it is possible to prevent inconveniences such as the imaging position fluctuating and out of focus. Good image quality is obtained both at low temperature and at high temperature. Can be taken.
【図１】本発明の第１の実施例を示すレンズ装置の概略
構成図である。FIG. 1 is a schematic configuration diagram of a lens device showing a first embodiment of the present invention.
【図２】本発明の第２の実施例を示すレンズ装置の概略
構成図である。FIG. 2 is a schematic configuration diagram of a lens device showing a second embodiment of the present invention.
１ レンズ鏡胴 ２ 光学系 ２ａ リレーレンズ ３ モータ ４ レンズ位置検出手段 ５，５´ 温度センサ １１ 補正量演算回路 １２ 補正データ設定手段 １３ 比較手段 １４ レンズ駆動回路 １５ 平均値回路 DESCRIPTION OF SYMBOLS 1 lens barrel 2 optical system 2a relay lens 3 motor 4 lens position detection means 5, 5'temperature sensor 11 correction amount calculation circuit 12 correction data setting means 13 comparison means 14 lens drive circuit 15 average value circuit
Claims (3)
少なくとも１つのレンズを温度変化によるピント補正用
のレンズとなし、この光学系が装着されている筺体の内
部に１乃至数箇所温度センサを設けて、温度に対応して
前記ピント補正用レンズの位置を調整するために、温度
に対するピント補正用レンズの位置に関するデータが設
定された補正データ設定手段と、前記温度センサで検出
した温度信号に基づいて、前記補正データ設定手段から
当該温度における前記ピント補正用レンズの位置を割り
出し、これとピント補正用レンズの現在位置信号とか
ら、この補正用レンズの移動量を演算する補正量演算回
路とを設け、この補正量演算回路からの出力信号に基づ
いて、前記ピント補正用レンズを、温度変化に対応して
結像位置を一定に保つ位置に変位させる構成としたこと
を特徴とするレンズ装置のピント補正機構。1. Among a plurality of lenses constituting an optical system,
At least one lens is used as a lens for focus correction due to temperature change, and one or several temperature sensors are provided inside the housing in which this optical system is mounted, and the position of the lens for focus correction corresponding to the temperature. In order to adjust the temperature, the correction data setting means in which the data regarding the position of the focus correction lens with respect to the temperature is set, and the focus correction at the temperature from the correction data setting means based on the temperature signal detected by the temperature sensor. The position of the correction lens is calculated, and a correction amount calculation circuit for calculating the movement amount of the correction lens from this and the current position signal of the focus correction lens is provided, and based on the output signal from the correction amount calculation circuit. A lens for displacing the focus correction lens to a position for keeping the image formation position constant in response to a temperature change Location of the focus correction mechanism.
この外部温度センサで検出した筺体外の温度によって前
記温度センサの検出温度信号を補正するようにしたこと
を特徴とする請求項１記載のレンズ装置のピント補正機
構。2. An external temperature sensor is provided outside the housing,
2. The focus correction mechanism for a lens device according to claim 1, wherein the temperature signal detected by the temperature sensor is corrected by the temperature outside the housing detected by the external temperature sensor.
て、これら各温度センサの平均値を演算して、検出温度
信号とするようにしたことを特徴とする請求項１記載の
レンズ装置のピント補正機構。3. The lens apparatus according to claim 1, wherein a plurality of temperature sensors are provided in the housing, and an average value of each of the temperature sensors is calculated to obtain a detected temperature signal. Focus correction mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28945891A JP3367107B2 (en) | 1991-10-09 | 1991-10-09 | Lens device focus correction mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28945891A JP3367107B2 (en) | 1991-10-09 | 1991-10-09 | Lens device focus correction mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05103255A true JPH05103255A (en) | 1993-04-23 |
| JP3367107B2 JP3367107B2 (en) | 2003-01-14 |
Family
ID=17743530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28945891A Expired - Lifetime JP3367107B2 (en) | 1991-10-09 | 1991-10-09 | Lens device focus correction mechanism |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3367107B2 (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0687945A1 (en) | 1994-06-14 | 1995-12-20 | Noritsu Koki Co., Ltd. | Optical apparatus having lens system drive device for temperature correction in direction of optical axis |
| JP2003015022A (en) * | 2001-06-29 | 2003-01-15 | Canon Inc | Distance measuring device, distance measuring method, and control program |
| JP2005091808A (en) * | 2003-09-18 | 2005-04-07 | Fuji Photo Film Co Ltd | Autofocus device |
| JP2005196173A (en) * | 2003-12-29 | 2005-07-21 | Hewlett-Packard Development Co Lp | System and method for estimating lens temperature |
| US20100329306A1 (en) * | 2009-06-26 | 2010-12-30 | Fluke Corporation | Protective enclosure for a thermal imaging device of an industrial monitoring system |
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| JP2013083717A (en) * | 2011-10-06 | 2013-05-09 | Canon Inc | Focus detector |
| WO2016165143A1 (en) * | 2015-04-17 | 2016-10-20 | 神画科技（深圳）有限公司 | Thermal out-of-focus automatic compensation projector |
| WO2018042759A1 (en) * | 2016-09-02 | 2018-03-08 | 富士フイルム株式会社 | Lens device, imaging device, and method for correcting defocus in lens device |
| US11487074B2 (en) * | 2018-11-28 | 2022-11-01 | Canon Kabushiki Kaisha | Lens apparatus, and method of estimating temperature of lens |
-
1991
- 1991-10-09 JP JP28945891A patent/JP3367107B2/en not_active Expired - Lifetime
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5754275A (en) * | 1994-06-14 | 1998-05-19 | Noritsu Koki Co., Ltd. | Optical apparatus having lens-system drive device for temperature correction in direction of optical axis |
| EP0687945A1 (en) | 1994-06-14 | 1995-12-20 | Noritsu Koki Co., Ltd. | Optical apparatus having lens system drive device for temperature correction in direction of optical axis |
| JP2003015022A (en) * | 2001-06-29 | 2003-01-15 | Canon Inc | Distance measuring device, distance measuring method, and control program |
| JP2005091808A (en) * | 2003-09-18 | 2005-04-07 | Fuji Photo Film Co Ltd | Autofocus device |
| JP2005196173A (en) * | 2003-12-29 | 2005-07-21 | Hewlett-Packard Development Co Lp | System and method for estimating lens temperature |
| US8042956B2 (en) | 2007-03-20 | 2011-10-25 | Casio Computer Co., Ltd. | Projector apparatus, projection control method and recording medium storing projection control program |
| TWI408487B (en) * | 2007-03-20 | 2013-09-11 | Casio Computer Co Ltd | Projector apparatus, projection control method and recording medium storing projection control program |
| US8753008B2 (en) * | 2009-06-26 | 2014-06-17 | Fluke Corporation | Protective enclosure for a thermal imaging device of an industrial monitoring system |
| US20100329306A1 (en) * | 2009-06-26 | 2010-12-30 | Fluke Corporation | Protective enclosure for a thermal imaging device of an industrial monitoring system |
| JP2011039352A (en) * | 2009-08-14 | 2011-02-24 | Fujifilm Corp | Projection display device |
| JP2013083717A (en) * | 2011-10-06 | 2013-05-09 | Canon Inc | Focus detector |
| WO2016165143A1 (en) * | 2015-04-17 | 2016-10-20 | 神画科技（深圳）有限公司 | Thermal out-of-focus automatic compensation projector |
| WO2018042759A1 (en) * | 2016-09-02 | 2018-03-08 | 富士フイルム株式会社 | Lens device, imaging device, and method for correcting defocus in lens device |
| CN109643005A (en) * | 2016-09-02 | 2019-04-16 | 富士胶片株式会社 | The defocus correction method of lens devices, photographic device, lens devices |
| JPWO2018042759A1 (en) * | 2016-09-02 | 2019-04-18 | 富士フイルム株式会社 | Lens apparatus, imaging apparatus |
| US10788644B2 (en) | 2016-09-02 | 2020-09-29 | Fujifilm Corporation | Lens device, imaging device, and focus shift correction method of lens device |
| CN109643005B (en) * | 2016-09-02 | 2020-12-22 | 富士胶片株式会社 | Lens device, imaging device, and defocus correction method for lens device |
| US11487074B2 (en) * | 2018-11-28 | 2022-11-01 | Canon Kabushiki Kaisha | Lens apparatus, and method of estimating temperature of lens |
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