JPH1138312A - Focus detector and camera - Google Patents
Focus detector and cameraInfo
- Publication number
- JPH1138312A JPH1138312A JP19582297A JP19582297A JPH1138312A JP H1138312 A JPH1138312 A JP H1138312A JP 19582297 A JP19582297 A JP 19582297A JP 19582297 A JP19582297 A JP 19582297A JP H1138312 A JPH1138312 A JP H1138312A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- focus detection
- sensor
- mirror
- imaging lens
- 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
Landscapes
- Automatic Focus Adjustment (AREA)
- Focusing (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、カメラの焦点検出
装置の改良に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a camera focus detection device.
【０００２】[0002]
【従来の技術】今日の数多くの一眼レフカメラには、ラ
インセンサを用いた位相差検知方式による自動焦点装置
が搭載されており、近年では、２次元的にもうけられた
焦点検出範囲の自由な位置で焦点検出が可能な、いわゆ
るエリア型オートフォーカス（以降エリアＡＦと称す
る）の提案も数多くなされいる。2. Description of the Related Art Many of today's single-lens reflex cameras are equipped with an automatic focusing device based on a phase difference detection method using a line sensor. In recent years, a two-dimensionally provided focus detection range is free. Many proposals have been made for so-called area-type autofocus (hereinafter, referred to as area AF) that enables focus detection at a position.
【０００３】図４はエリアＡＦを実現するための焦点検
出光学系を示すカメラのミラーボックスの中央断面図で
ある。FIG. 4 is a central sectional view of a mirror box of a camera showing a focus detecting optical system for realizing area AF.
【０００４】１０１はレンズマウントであり、この左方
に不図示の対物レンズが取りつけられる。１０３はメイ
ンミラー受板１１４に固定され、対物レンズの光軸１０
２上に配置される半透過性の領域を有するメインミラ
ー、１０４は同様にサブミラー受板１１５に固定され、
対物レンズの光軸１０１上に斜めに配置されたサブミラ
ー以降は自動焦点検出装置の基体であるＡＦ本体ブロッ
ク１１６に取付けられる部品であり、１０７はサブミラ
ー１０４からの光束を折返す平面鏡である第１ＡＦミラ
ー、１０８は前記第１ＡＦミラーの不要な光線の反射を
防ぐためのマスク部材、１０９は焦点検出の精度を低下
させる要因となる赤外線を除去する赤外線カットフィル
タ、１１０は少なくとも一対の絞り開口を有する金属製
あるいは樹脂製の遮光性薄板よりなる絞り板、１１１は
前記絞り開口に対応して少なくとも一対のレンズ部を有
する再結像レンズブロック、１１２は再結像レンズブロ
ック１１１からの光束を直角に折返す第２ＡＦミラー、
１１３は再結像レンズブロックによる少なくとも一対の
二次物体像が投影される受光部を有するＡＦセンサであ
る。１１７はＡＦセンサ１１３およびその周辺回路（不
図示）を搭載し、メイン基板（不図示）に接続されるＡ
Ｆフレキである。Reference numeral 101 denotes a lens mount to which an objective lens (not shown) is attached to the left. 103 is fixed to the main mirror receiving plate 114, and the optical axis 10 of the objective lens is
A main mirror 104 having a semi-transmissive region arranged on the second 2, similarly fixed to a sub-mirror receiving plate 115,
Sub-mirrors disposed obliquely on the optical axis 101 of the objective lens and thereafter are components attached to the AF main body block 116 which is a base of the automatic focus detection device. Reference numeral 107 denotes a first AF which is a plane mirror that folds a light beam from the sub-mirror 104. A mirror 108 is a mask member for preventing reflection of unnecessary light rays from the first AF mirror, an infrared cut filter 109 is provided for removing infrared rays that cause a reduction in accuracy of focus detection, and a reference numeral 110 is at least a pair of aperture openings. An aperture plate made of a light-shielding thin plate made of metal or resin, 111 is a re-imaging lens block having at least a pair of lens portions corresponding to the aperture opening, and 112 is a light beam from the re-imaging lens block 111 at a right angle. The second AF mirror that turns back,
Reference numeral 113 denotes an AF sensor having a light receiving unit that projects at least a pair of secondary object images by the re-imaging lens block. Reference numeral 117 denotes an A mounted with the AF sensor 113 and its peripheral circuit (not shown) and connected to a main board (not shown).
It is F flexible.
【０００５】カメラとして使用する状態において、温度
変化による焦点検出への影響は 温度センサ（不図示）
により温度をモニターすることによって補正する。In a state where the camera is used as a camera, the influence of temperature change on focus detection is determined by a temperature sensor (not shown).
Compensate by monitoring temperature.
【０００６】この温度センサの配置については、一般に
はカメラ内の焦点検出装置とは別の場所に配置されてい
る。[0006] The arrangement of the temperature sensor is generally arranged at a place different from the focus detecting device in the camera.
【０００７】[0007]
【発明が解決しようとしている課題】自動焦点検出装置
において、温度変化による焦点検出への影響がもっとも
大きいのは再結像レンズである。そのため、自動焦点検
出装置の正確な温度補正を行うためには、再結像レンズ
の温度を正確に知る必要がある。従来は温度補正のため
の温度センサは、オートフォーカスのユニットとは別の
場所に設けられていた。In the automatic focus detection device, the re-imaging lens has the greatest influence on the focus detection due to the temperature change. Therefore, in order to perform accurate temperature correction of the automatic focus detection device, it is necessary to know the temperature of the re-imaging lens accurately. Conventionally, a temperature sensor for temperature correction has been provided at a location different from the autofocus unit.
【０００８】そのため、測定した温度と、自動焦点検出
装置内の再結像レンズの温度が異なり正確な温度補正が
できなかった。また、温度センサをＡＦセンサに内蔵す
る方法も提案されているが、そうするとＡＦセンサ自体
の発熱があるため再結像レンズの正確な温度測定ができ
なかった。For this reason, the measured temperature differs from the temperature of the re-imaging lens in the automatic focus detection device, and accurate temperature correction cannot be performed. Although a method of incorporating a temperature sensor in an AF sensor has also been proposed, accurate measurement of the temperature of the re-imaging lens could not be performed because of the heat generated by the AF sensor itself.
【０００９】また、再結像レンズ自体の近傍の温度を測
定する温度センサを備えた自動焦点検出装置が特公平８
−３３５１１号公報に示されているが、再結像レンズ
は、自動焦点検出装置の内部にある非常に小さな部品で
あるため、温度センサの配置が難しく、組み立て、配線
が困難になるという問題点があった。An automatic focus detecting device provided with a temperature sensor for measuring the temperature near the re-imaging lens itself is disclosed in
As described in JP-A-33511, since the re-imaging lens is a very small part inside the automatic focus detection device, it is difficult to dispose the temperature sensor, and it is difficult to assemble and wire. was there.
【００１０】本出願に係る第１の発明の目的は、焦点検
出精度にもっとも影響を与える部品の温度を正確に測定
し、高精度な温度補正と、高精度なオートフォーカス精
度を実現することにある。An object of the first invention according to the present application is to accurately measure the temperature of a component which has the greatest influence on the focus detection accuracy, and to realize a high-precision temperature correction and a high-precision autofocus accuracy. is there.
【００１１】本出願に係る第２の発明の目的は、再結像
レンズの温度を正確に測定することを可能にして、高精
度な温度補正と、高精度なオートフォーカス精度を実現
することにある。An object of a second invention according to the present application is to realize a high-precision temperature correction and a high-precision auto-focus accuracy by enabling accurate measurement of the temperature of a re-imaging lens. is there.
【００１２】本出願に係る第３の発明の目的は、取り付
け、配線が容易な位置に温度センサを設置することを可
能にし、且つ再結像レンズの温度を正確に測定すること
を可能にして、高精度な温度補正と、高精度なオートフ
ォーカス精度を実現することにある。A third object of the present invention is to make it possible to install a temperature sensor at a position where mounting and wiring are easy, and to make it possible to accurately measure the temperature of a re-imaging lens. Another object of the present invention is to realize high-precision temperature correction and high-precision autofocus accuracy.
【００１３】[0013]
【課題を解決するための手段】本出願に係る第１の発明
の目的を実現する構成としては、請求項１に記載のよう
に、焦点検出のための受光部を有する光電変換手段と、
焦点検出部材用の温度検出手段を備えた焦点検出装置に
おいて、前記温度検出手段が検出する温度が、前記焦点
検出装置内の焦点検出精度にもっとも影響を与える部位
の温度とほぼ等しくなるように、前記温度検出手段を前
記光電変換手段に対し、熱的に保持する保持手段を介し
て配置したことを特徴とする。According to a first aspect of the present invention, there is provided a photoelectric conversion device having a light receiving section for focus detection,
In a focus detection device provided with temperature detection means for a focus detection member, such that the temperature detected by the temperature detection means is substantially equal to the temperature of a portion of the focus detection device that most affects focus detection accuracy, The temperature detecting means is disposed via a holding means for thermally holding the temperature with respect to the photoelectric conversion means.
【００１４】このような構成により、焦点検出精度にも
っとも影響を与える部品の温度を正確に測定することが
可能となり、高精度な温度補正が可能となり、高精度な
オートフォーカス精度を実現することができる。With such a configuration, it is possible to accurately measure the temperature of a component that has the greatest influence on the focus detection accuracy, to perform high-precision temperature correction, and to realize high-precision autofocus accuracy. it can.
【００１５】本出願に係る第２発明の目的を実現する構
成としては、請求項２に記載のように、撮影レンズによ
って得られる一次物体像を分離する少くとも一対の再結
像レンズと、該再結像レンズによって形成される二次物
体像が投影される受光部を有する光電変換手段と、該再
結像レンズ用の温度検出手段を備える焦点検出装置にお
いて、前記温度検出手段が検出する温度が、前記再結像
レンズの温度とほぼ等しくなるように、前記温度検出手
段を前記光電変換手段に対し、熱的に保持する保持手段
を介して配置したことを特徴とする。According to a second aspect of the present invention, at least a pair of re-imaging lenses for separating a primary object image obtained by a photographing lens is provided. In a focus detection device including a photoelectric conversion unit having a light receiving unit on which a secondary object image formed by a re-imaging lens is projected, and a temperature detection unit for the re-imaging lens, a temperature detected by the temperature detection unit However, the temperature detecting means is arranged via a holding means for thermally holding the temperature detecting means with respect to the photoelectric conversion means so as to be substantially equal to the temperature of the re-imaging lens.
【００１６】このような構成により、再結像レンズの温
度を正確に測定することが可能となり、高精度な温度補
正が可能となり、高精度なオートフォーカス精度を実現
することができる。With such a configuration, it is possible to accurately measure the temperature of the re-imaging lens, perform highly accurate temperature correction, and realize highly accurate autofocus accuracy.
【００１７】本出願に係る第３発明の目的を実現する構
成としては、請求項３に記載のように、前記保持手段
は、前記光電変換手段を搭載している基板の裏面に配置
されていることを特徴とする。According to a third aspect of the present invention, the holding means is arranged on a back surface of a substrate on which the photoelectric conversion means is mounted. It is characterized by the following.
【００１８】このような構成により、取り付け、配線が
容易な位置に温度検出手段を取り付けることを可能にす
ると共に、再結像レンズの温度を正確に測定することが
可能となり、高精度な温度補正が可能となり、高精度な
オートフォーカス精度を実現することができる。With such a configuration, it is possible to attach the temperature detecting means at a position where the attachment and wiring are easy, and it is possible to accurately measure the temperature of the re-imaging lens, thereby achieving a highly accurate temperature correction. And high-precision autofocus accuracy can be realized.
【００１９】本出願に係る第４発明の目的を実現する構
成としては、請求項４に記載のように、請求項１、２ま
たは３に記載の焦点検出装置を有することを特徴とする
カメラにある。According to a fourth aspect of the present invention, there is provided a camera having the focus detecting device according to the first, second or third aspect. is there.
【００２０】このような構成により、取り付け、配線が
容易な位置に温度検出手段を取り付けることを可能し、
再結像レンズの温度を正確に測定することが可能とな
り、高精度な温度補正と、高精度なオートフォーカス精
度を実現することができるカメラを提供することができ
る。With such a configuration, it is possible to attach the temperature detecting means at a position where attachment and wiring are easy,
It is possible to accurately measure the temperature of the re-imaging lens, and to provide a camera capable of realizing high-precision temperature correction and high-precision autofocus accuracy.
【００２１】[0021]
（第１の実施の形態）図１乃至図３は本発明の第１の実
施の形態を示す。(First Embodiment) FIGS. 1 to 3 show a first embodiment of the present invention.
【００２２】図１は本発明を用いたエリアＡＦを実現さ
せるための焦点検出光学系を示すカメラのミラーボック
スの中央断面図、図２は前記焦点検出光学系のうち再結
像レンズブロック及びＡＦセンサ等を保持する基体であ
るＡＦ本体ブロック周辺の構成を示す斜視図である。１
はレンズマウントであり、この左方に不図示の対物レン
ズが取りつけられる。３はメインミラー受板１４に固定
され、対物レンズの光軸２上に配置される半透過性の領
域を有するメインミラー、４は同様にサブミラー受板１
５に固定され、対物レンズの光軸２上に斜めに配置され
たサブミラー、６はサブミラー４による撮像面５に共役
な近軸的結像面である。FIG. 1 is a center sectional view of a mirror box of a camera showing a focus detection optical system for realizing an area AF using the present invention, and FIG. 2 is a re-imaging lens block and an AF of the focus detection optical system. FIG. 3 is a perspective view showing a configuration around an AF body block which is a base holding a sensor and the like. 1
Denotes a lens mount to which an objective lens (not shown) is attached to the left. A main mirror 3 is fixed to a main mirror receiving plate 14 and has a semi-transparent region arranged on the optical axis 2 of the objective lens.
A sub-mirror fixed to 5 and arranged obliquely on the optical axis 2 of the objective lens, and 6 is a paraxial imaging plane conjugate to the imaging plane 5 by the sub-mirror 4.
【００２３】以降は焦点検出装置の基体であるＡＦ本体
ブロック１６に取付けられる部品であり、７はサブミラ
ー４からの光束を折返す平面鏡である第１ＡＦミラー、
８は前記第１ＡＦミラーの不要な光線の反射を防ぐため
のマスク部材、９は焦点検出の精度を低下させる要因と
なる赤外線を除去する赤外線カットフィルタ、１０は直
交する２対の絞り開口１０ｅ、１０ｇ、１０ｆ、１０ｈ
を有する金属製あるいは樹脂製の遮光性薄板よりなる絞
り板、１１は前記絞り開口に対応して２対のレンズ部１
１ｅ、１１ｇ、１１ｆ、１１ｈを有する再結像レンズブ
ロック、１２は再結像レンズブロック１１からの光束を
直角に折返す第２ＡＦミラー、１３は再結像レンズブロ
ック１１による直交する２対の二次物体像が投影される
受光部１３ｅ、１３ｇ、１３ｆ、１３ｈを有するＡＦセ
ンサである。The following are parts to be attached to the AF main body block 16 which is the base of the focus detection device. Reference numeral 7 denotes a first AF mirror which is a plane mirror that folds a light beam from the sub mirror 4.
8 is a mask member for preventing reflection of unnecessary light rays of the first AF mirror, 9 is an infrared cut filter for removing infrared rays which is a factor of deteriorating focus detection accuracy, 10 is two pairs of orthogonal apertures 10e, 10g, 10f, 10h
A diaphragm plate made of a metal or resin light-shielding thin plate having a pair of lens portions 1 corresponding to the diaphragm aperture;
1e, 11g, 11f, 11h, a re-imaging lens block, 12 is a second AF mirror that folds the light beam from the re-imaging lens block 11 at right angles, and 13 is a pair of two orthogonal AF mirrors by the re-imaging lens block 11. The AF sensor has light receiving units 13e, 13g, 13f, and 13h on which the next object image is projected.
【００２４】１７はＡＦセンサ１３およびその周辺回路
（不図示）を搭載し、メイン基板（不図示）に接続され
るＡＦフレキである。ＡＦフレキ１７のＡＦセンサ１３
の裏側部分には樹脂製の温度センサ保持部材２０が固定
されている。Reference numeral 17 denotes an AF flexible board on which the AF sensor 13 and its peripheral circuits (not shown) are mounted and which is connected to a main board (not shown). AF sensor 13 of AF flex 17
The temperature sensor holding member 20 made of resin is fixed to the back side portion.
【００２５】温度センサ保持部材２０の下側には凹部が
形成されており、そこに温度センサ２１が接着剤等によ
り埋め込まれ固定されている。２２は温度センサを搭載
する温度センサフレキであり、ＡＦフレキ１７と半田付
け接続されている。A concave portion is formed below the temperature sensor holding member 20, in which a temperature sensor 21 is embedded and fixed by an adhesive or the like. Reference numeral 22 denotes a temperature sensor flexible on which a temperature sensor is mounted, which is connected to the AF flexible 17 by soldering.
【００２６】さらに、各要素に関して詳しく述べると、
図３に示すようにサブミラー４は回転楕円面である略小
判状の反射部４ａとサブミラー受板１５に固定するため
のフランジ部４ｂで構成され、反射部４ａを開口とした
サブミラーマスク２３が取り付けられている。これによ
ってサブミラー４は焦点検出領域を制限する視野マスク
の役割を兼ねることになる。前記反射部４ａの楕円を定
義する二つの焦点は、対物レンズの光軸２上の光線がメ
インミラー３で屈折した後の光路を逆に対物レンズ側に
延長した線上と、その光線がサブミラーによって反射し
た後の光路を延長した線上にそれぞれ位置する。ここで
は一方の焦点を対物レンズの代表射出瞳位置の光学的な
等価点に、他方の焦点を絞り板１０の光学的な等価点に
設定し、フィールドレンズとしての機能を持たせてい
る。対物レンズの代表射出瞳位置とは、カメラに装着さ
れる種々の撮影レンズの射出窓の条件を勘案し総合的に
決定される焦点検出系固有の仮想瞳位置である。Further, when each element is described in detail,
As shown in FIG. 3, the sub-mirror 4 includes a substantially oval-shaped reflecting portion 4a having a spheroidal surface and a flange portion 4b for fixing to the sub-mirror receiving plate 15, and a sub-mirror mask 23 having the reflecting portion 4a as an opening is attached. Have been. Thus, the sub-mirror 4 also functions as a field mask that limits the focus detection area. The two focal points that define the ellipse of the reflecting portion 4a are, on the line obtained by reversing the optical path after the ray on the optical axis 2 of the objective lens is refracted by the main mirror 3 toward the objective lens, and by the sub-mirror The optical path after reflection is located on each of the extended lines. Here, one focal point is set at the optical equivalent point of the representative exit pupil position of the objective lens, and the other focal point is set at the optical equivalent point of the aperture plate 10 so as to have a function as a field lens. The representative exit pupil position of the objective lens is a virtual pupil position unique to the focus detection system which is comprehensively determined in consideration of the conditions of the exit windows of various photographing lenses mounted on the camera.
【００２７】再結像レンズブロック１１の光入射側はサ
ブミラーによって偏向した対物レンズの光軸上に中心を
持つ単一の凹状球面１１ａ、射出側は互いに反対方向に
偏芯した２対の凸レンズ１１ｅ〜１１ｈとなっている。
さらに、凹状球面１１ａの中心はサブミラーによって形
成される対物レンズの近軸的結像面６に、また、前記２
対のレンズ部１１ｅ〜１１ｈの中心は前記絞り板１０の
絞り開口１０ｅ〜１０ｈの近傍にほぼ等しく設定してあ
る。The light incident side of the re-imaging lens block 11 is a single concave spherical surface 11a centered on the optical axis of the objective lens deflected by the sub-mirror, and the exit side is a pair of convex lenses 11e eccentric in opposite directions. １１11h.
Further, the center of the concave spherical surface 11a is located on the paraxial imaging plane 6 of the objective lens formed by the sub-mirror.
The centers of the pair of lens portions 11e to 11h are set substantially equal to the vicinity of the aperture openings 10e to 10h of the aperture plate 10.
【００２８】絞り板１０及び再結像レンズブロック１１
は、取付穴１０ｉ、１０ｊ、取付穴１１ｉ、１１ｊ相互
がＡＦ本体ブロック１６の軸１６ｉ、１６ｊに嵌合する
ことで位置決めされ、軸先端部にて赤外線カットフィル
タ９と共にＵＶ接着剤等で固定される。Aperture plate 10 and re-imaging lens block 11
Are positioned by fitting the mounting holes 10i, 10j and the mounting holes 11i, 11j to the shafts 16i, 16j of the AF body block 16, and are fixed together with the infrared cut filter 9 at the tip of the shaft with a UV adhesive or the like. You.
【００２９】焦点検出光束の光路としては、絞り開口と
レンズ部とは同一の添え字で示したもの同士が対応し、
各絞り開口を通過した光束は第２ＡＦミラーを介してＡ
Ｆセンサ１３上の同一の添え字で示した受光部に二次物
体像を形成する。なお、異なる添え字の要素を通過した
光束はＡＦセンサ１３上の所定の位置に到達しないため
焦点検出には寄与しない。添え字ｅ，ｇで示した要素を
通過する光束を用いる検出系は、対物レンズの射出瞳を
縦方向に分離し、一方、添え字ｆ、ｈで示した要素を通
過する光束を用いる検出系は、対物レンズの射出瞳を横
方向に分離する。以降、瞳を縦方向に分離する検出系を
第１の焦点検出系、瞳を横方向に分離する検出系を第２
の焦点検出系と呼ぶことにする ここで、絞り開口１０ｅ、１０ｇの間隔と、絞り開口１
０ｆ、１０ｈの間隔とは夫々異なり、間隔の広い第２の
焦点検出系の方が２次物体像の移動に対し敏感となるこ
とで高精度な焦点検出が可能となる。As the optical path of the focus detection light beam, the aperture opening and the lens portion correspond to those indicated by the same suffix.
The light beam that has passed through each of the aperture openings is transmitted through the second AF mirror to A
A secondary object image is formed on the light receiving section indicated by the same subscript on the F sensor 13. It should be noted that the light beam that has passed through the elements with different subscripts does not reach a predetermined position on the AF sensor 13 and does not contribute to focus detection. The detection system using the light beam passing through the elements indicated by the subscripts e and g separates the exit pupil of the objective lens in the vertical direction, while using the light beam passing through the elements indicated by the subscripts f and h. Separates the exit pupil of the objective lens in the lateral direction. Hereinafter, the detection system that separates the pupil in the vertical direction is the first focus detection system, and the detection system that separates the pupil in the horizontal direction is the second focus detection system.
Here, the distance between the aperture openings 10e and 10g and the aperture aperture 1
Different from the intervals of 0f and 10h, the second focus detection system having a wider interval is more sensitive to the movement of the secondary object image, thereby enabling highly accurate focus detection.
【００３０】ＡＦ本体ブロック１６の２つの穴部１６ａ
には上下方向に摺動可能にアジャスター１９が取り付け
られており、それぞれのアジャスター１９に一体突設さ
れたヒンジ部１９ａには金属板からなるＡＦセンサ保持
部材１８の円弧切欠状の摺動部１８ａが当接する。そし
て、ＡＦセンサ保持部材１８の下面にはＡＦセンサ１３
の受光面側に張り付けられたカバーガラス１３ａの表面
が当接する。Two holes 16a of the AF main body block 16
An adjuster 19 is slidably mounted in a vertical direction, and hinge portions 19a integrally formed with the respective adjusters 19 have arc-shaped notched sliding portions 18a of an AF sensor holding member 18 made of a metal plate. Abuts. The AF sensor 13 is provided on the lower surface of the AF sensor holding member 18.
The surface of the cover glass 13a adhered to the light receiving surface side of the contact member abuts.
【００３１】前記アジャスター１９およびＡＦセンサ保
持部材１８は、光軸を含んだ直交する３軸についてＡＦ
センサ１３の傾き調整を行う機構であり、焦点検出装置
を構成する各部品の精度や組み立ての誤差などにより生
ずる光軸のずれに対して、ＡＦセンサ１３の受光面を適
切に配置するためのものである。ＡＦセンサ１３の固定
は、左右２箇所のアジャスター１９のヒンジ部１９ａの
周りを、それぞれＡＦ本体ブロック１６、ＡＦセンサ保
持部材１８そしてＡＦセンサ１３を含めてＵＶ接着剤等
を用いて接着することで行う。The adjuster 19 and the AF sensor holding member 18 are provided with three orthogonal axes including the optical axis.
A mechanism for adjusting the tilt of the sensor 13, and for arranging the light receiving surface of the AF sensor 13 properly in response to a shift in the optical axis caused by the accuracy of each component constituting the focus detection device or an assembly error. It is. The AF sensor 13 is fixed by bonding around the hinge portions 19a of the two adjusters 19 on the left and right, including the AF main body block 16, the AF sensor holding member 18, and the AF sensor 13, using a UV adhesive or the like. Do.
【００３２】また、間隔の狭い第１の焦点検出系では前
述したサブミラー４の反射部４ａの大きさで決定される
領域にて焦点検出可能であるが、間隔の広い第２の焦点
検出系では第１ＡＦミラー７上のマスク部材８の開口部
８ａと、前述の代表瞳の大きさ等に光線が通ることので
きる領域が制限されるために、焦点検出範囲が異なった
ものになる。In the first focus detection system having a short interval, the focus can be detected in the area determined by the size of the reflecting portion 4a of the sub-mirror 4, but in the second focus detection system having a wide interval. Since the aperture 8a of the mask member 8 on the first AF mirror 7 and the area through which light rays can pass, such as the size of the representative pupil, are limited, the focus detection ranges are different.
【００３３】以上説明したように、本発明を含む焦点検
出装置は従来よりある位相差検知方式をもって二次元的
な範囲で焦点検出を行う、いわゆるエリアＡＦを実現し
たものである。前述するＡＦセンサ１３を用いて光量分
布を電気信号として出力し、検出対象とした一対のセン
サ列上の像の相対的位置関係を検出することによって、
対物レンズの焦点位置を検出することが可能である。こ
の際、検出対象のセンサ列対を適当に選択すれば、撮像
面上で二次元的な結像状態の検出ができる。As described above, the focus detection apparatus including the present invention realizes a so-called area AF in which focus detection is performed in a two-dimensional range using a conventional phase difference detection method. By outputting the light amount distribution as an electric signal using the AF sensor 13 described above, and detecting the relative positional relationship between the images on a pair of sensor rows to be detected,
It is possible to detect the focal position of the objective lens. At this time, if the sensor row pair to be detected is appropriately selected, a two-dimensional imaging state can be detected on the imaging surface.
【００３４】ここで上記焦点検出装置が回転楕円面であ
るサブミラー４を含むＺ型の光学系を採用している理由
は、近軸的結像面６からＡＦセンサ１３までの光路長を
長く採るなかで、上記再結像レンズブロック１１とＡＦ
センサ１３の距離を極力短くすることによって、ＡＦセ
ンサ１３への再結像倍率を極力小さいものとしカメラに
収納可能な小型のＡＦセンサを用いることを可能とする
ためである。Here, the reason why the above-mentioned focus detecting device employs a Z-type optical system including the sub-mirror 4 which is a spheroidal surface is that the optical path length from the paraxial imaging plane 6 to the AF sensor 13 is long. Among them, the re-imaging lens block 11 and the AF
By making the distance of the sensor 13 as short as possible, the re-imaging magnification to the AF sensor 13 can be made as small as possible, and a small AF sensor that can be stored in the camera can be used.
【００３５】従って、本発明の焦点検出装置では従来よ
り微少な画素を持つＡＦセンサ１３を使用しており、Ａ
Ｆセンサ１３上の二次物体像位置の変化はたとえ微少で
も焦点検出に大きな影響を及ぼす。そのため温度の変化
により、再結像レンズのレンズ間隔が変化すると、焦点
検出に大きな影響を及ぼす。Therefore, the focus detection device of the present invention uses the AF sensor 13 having finer pixels than in the prior art.
A change in the position of the secondary object image on the F sensor 13 has a great effect on focus detection even if it is minute. Therefore, a change in the lens interval of the re-imaging lens due to a change in temperature has a great effect on focus detection.
【００３６】カメラとして使用する状態において、温度
収縮での位置変化による焦点検出への影響は 温度セン
サ２１により温度をモニターすることによって補正す
る。In a state where the camera is used as a camera, the influence on the focus detection due to the position change due to the temperature shrinkage is corrected by monitoring the temperature with the temperature sensor 21.
【００３７】再結像レンズブロック１１は、ＡＦセンサ
１３の発熱の影響を受けて温度が上昇してしまう。そこ
で、温度センサ２１を保持する温度センサ保持部材２０
は、温度センサ２１が検出する温度が再結像レンズブロ
ック１１の温度とほぼ等しくなるように、ＡＦセンサ１
３に対して、適切な熱容量、熱抵抗を持つように設定さ
れている。このように温度センサ２１を配置することに
より、該温度センサ２１の検出する温度は常に再結像レ
ンズブロック１１の温度とほぼ一致し、正確な温度補正
を可能としている。The temperature of the re-imaging lens block 11 rises due to the influence of the heat generated by the AF sensor 13. Therefore, the temperature sensor holding member 20 holding the temperature sensor 21
Is the AF sensor 1 such that the temperature detected by the temperature sensor 21 is substantially equal to the temperature of the re-imaging lens block 11.
3 is set to have an appropriate heat capacity and heat resistance. By arranging the temperature sensor 21 in this manner, the temperature detected by the temperature sensor 21 almost always coincides with the temperature of the re-imaging lens block 11, thereby enabling accurate temperature correction.
【００３８】本実施の形態においては、樹脂製の温度セ
ンサ保持部材２０を用いているが、焦点検出装置の構成
により、所望の熱抵抗、熱容量を得るために金属など適
当な部材を選択できる。また、焦点検出装置への温度セ
ンサ保持部材２０の固定方法については、接着剤による
接着、両面テープによる貼着、ビス止めなど適当な方法
を採用することができる。In the present embodiment, the temperature sensor holding member 20 made of resin is used, but an appropriate member such as a metal can be selected to obtain a desired heat resistance and heat capacity, depending on the configuration of the focus detection device. Further, as a method of fixing the temperature sensor holding member 20 to the focus detection device, an appropriate method such as bonding with an adhesive, sticking with a double-sided tape, and screwing can be adopted.
【００３９】本発明は本実施の形態におけるエリアＡＦ
に限らず従来よりある焦点検出装置に用いても良い。The present invention relates to an area AF according to the present embodiment.
The present invention is not limited to this and may be used for a conventional focus detection device.
【００４０】[0040]
【発明の効果】請求項１に係る発明によれば、焦点検出
精度にもっとも影響を与える部品の温度を正確に測定す
ることが可能となり、高精度な温度補正が可能となり、
高精度なオートフォーカス精度を実現することができ
る。According to the first aspect of the present invention, it is possible to accurately measure the temperature of a component which has the greatest influence on the focus detection accuracy, and it is possible to perform highly accurate temperature correction.
High-precision autofocus accuracy can be realized.
【００４１】請求項２に係る発明によれば、再結像レン
ズの温度を正確に測定することが可能となり、高精度な
温度補正が可能となり、高精度なオートフォーカス精度
を実現することができる。According to the second aspect of the present invention, it is possible to accurately measure the temperature of the re-imaging lens, perform high-precision temperature correction, and realize high-precision autofocus accuracy. .
【００４２】請求項３に係る発明によれば、取り付け、
配線が容易な位置に温度検出手段を取り付けることを可
能にすると共に、再結像レンズの温度を正確に測定する
ことが可能となり、高精度な温度補正が可能となり、高
精度なオートフォーカス精度を実現することができる。According to the invention of claim 3, mounting,
In addition to making it possible to attach the temperature detection means to a position where wiring is easy, it is possible to accurately measure the temperature of the re-imaging lens, and it is possible to perform high-precision temperature correction, and to achieve high-precision autofocus accuracy. Can be realized.
【００４３】請求項４に係る発明によれば、取り付け、
配線が容易な位置に温度検出手段を取り付けることを可
能し、再結像レンズの温度を正確に測定することが可能
となり、高精度な温度補正と、高精度なオートフォーカ
ス精度を実現することができるカメラを提供することが
できる。According to the invention of claim 4, mounting,
It is possible to attach the temperature detection means at a position where wiring is easy, it is possible to accurately measure the temperature of the re-imaging lens, and it is possible to realize high-precision temperature correction and high-precision autofocus accuracy Can be provided.
【図１】本発明の第１の実施の形態の焦点検出光学系を
示すカメラの中央断面図FIG. 1 is a center sectional view of a camera showing a focus detection optical system according to a first embodiment of the present invention.
【図２】本発明の第１の実施の形態の焦点光学系のうち
ＡＦ本体ブロックの構成を示す斜視図FIG. 2 is a perspective view illustrating a configuration of an AF main body block in the focusing optical system according to the first embodiment of the present invention.
【図３】本発明の第１の実施の形態のサブミラー受板の
構成を示す平面図FIG. 3 is a plan view showing a configuration of a sub mirror receiving plate according to the first embodiment of the present invention.
【図４】従来の焦点検出光学系の一例を示すカメラの中
央断面図FIG. 4 is a central sectional view of a camera showing an example of a conventional focus detection optical system.
１：レンズマウント ２：対物レンズの光軸 ３：メインミラー ４：サブミラー ４ａ：反射部 ４ｂ：フランジ部 ５：撮像面 ６：近軸的結像面 ７：第１ＡＦミラー ８：マスク部材 ８ａ：開口部 ９：赤外線カットフィルタ １０：絞り板 １０ｅ：絞り開口 １０ｆ：絞り開口 １０ｇ：絞り開口 １０ｈ：絞り開口 １０ｉ：取付穴 １０ｊ：取付穴 １１：再結像レンズブロック １１ａ：凹状球面 １１ｅ：レンズ部 １１ｆ：レンズ部 １１ｇ：レンズ部 １１ｈ：レンズ部 １１ｉ：取付穴 １１ｊ：取付穴 １２：第２ＡＦミラー １３：ＡＦセンサ １３ａ：カバーガラス １３ｅ：受光部 １３ｆ：受光部 １３ｇ：受光部 １３ｈ：受光部 １４：メインミラー受板 １５：サブミラー受板 １６：ＡＦ本体ブロック １６ａ：穴部 １６ｉ：軸 １６ｊ：軸 １７：ＡＦフレキ １８：ＡＦセンサ保持部材 １８ａ：摺動部 １９：アジャスター １９ａ：ヒンジ部 ２０：温度センサ保持部材 ２１：温度センサ ２２：温度センサフレキ ２３：サブミラーマスク １０１：レンズマウント １０２：対物レンズの光軸 １０３：メインミラー １０４：サブミラー １０５：撮像面 １０６：近軸的結像面 １０７：第１ＡＦミラー １０８：マスク部材 １０９：赤外線カットフィルタ １１０：絞り板 １１１：再結像レンズブロック １１２：第２ＡＦミラー １１３：ＡＦセンサ １１４：メインミラー受板 １１５：サブミラー受板 １１６：ＡＦ本体ブロック １１７：ＡＦフレキ 1: lens mount 2: optical axis of objective lens 3: main mirror 4: sub-mirror 4a: reflecting portion 4b: flange portion 5: imaging surface 6: paraxial imaging surface 7: first AF mirror 8: mask member 8a: aperture Part 9: Infrared cut filter 10: Aperture plate 10e: Aperture aperture 10f: Aperture aperture 10g: Aperture aperture 10h: Aperture aperture 10i: Mounting hole 10j: Mounting hole 11: Re-imaging lens block 11a: Concave spherical surface 11e: Lens part 11f : Lens portion 11g: Lens portion 11h: Lens portion 11i: Mounting hole 11j: Mounting hole 12: Second AF mirror 13: AF sensor 13a: Cover glass 13e: Light receiving portion 13f: Light receiving portion 13g: Light receiving portion 13h: Light receiving portion 14: Main mirror receiving plate 15: Sub mirror receiving plate 16: AF body block 16a: Hole 16i: Axis 16j: Axis 17 : AF flexible 18: AF sensor holding member 18a: Sliding portion 19: Adjuster 19a: Hinge portion 20: Temperature sensor holding member 21: Temperature sensor 22: Temperature sensor flexible 23: Sub mirror mask 101: Lens mount 102: Optical axis of objective lens 103: Main mirror 104: Submirror 105: Imaging surface 106: Paraxial imaging surface 107: First AF mirror 108: Mask member 109: Infrared cut filter 110: Aperture plate 111: Re-imaging lens block 112: Second AF mirror 113 : AF sensor 114: Main mirror receiving plate 115: Sub-mirror receiving plate 116: AF body block 117: AF flexible
Claims (4)
換手段と、焦点検出部材用の温度検出手段を備えた焦点
検出装置において、前記温度検出手段が検出する温度
が、前記焦点検出装置内の焦点検出精度にもっとも影響
を与える部位の温度とほぼ等しくなるように、前記温度
検出手段を前記光電変換手段に対し、熱的に保持する保
持手段を介して配置したことを特徴とする焦点検出装
置。1. A focus detection apparatus comprising: a photoelectric conversion unit having a light receiving unit for focus detection; and a temperature detection unit for a focus detection member, wherein a temperature detected by the temperature detection unit is within the focus detection device. Wherein the temperature detecting means is disposed via a holding means for thermally holding the temperature detecting means with respect to the photoelectric conversion means so as to be substantially equal to a temperature of a portion which most affects the focus detection accuracy of the focus detection. apparatus.
を分離する少くとも一対の再結像レンズと、該再結像レ
ンズによって形成される二次物体像が投影される受光部
を有する光電変換手段と、該再結像レンズ用の温度検出
手段を備える焦点検出装置において、前記温度検出手段
が検出する温度が、前記再結像レンズの温度とほぼ等し
くなるように、前記温度検出手段を前記光電変換手段に
対し、熱的に保持する保持手段を介して配置したことを
特徴とする焦点検出装置。2. A photoelectric conversion means having at least a pair of re-imaging lenses for separating a primary object image obtained by a photographing lens, and a light receiving section onto which a secondary object image formed by the re-imaging lens is projected. And a focus detection device provided with a temperature detection unit for the re-imaging lens, wherein the temperature detection unit is connected to the photoelectric conversion unit so that a temperature detected by the temperature detection unit is substantially equal to a temperature of the re-imaging lens. A focus detection device, wherein the focus detection device is disposed via a holding unit that thermally holds the conversion unit.
載している基板の裏面に配置されていることを特徴とす
る請求項１または請求項２記載の焦点検出装置。3. The focus detection device according to claim 1, wherein the holding unit is disposed on a back surface of a substrate on which the photoelectric conversion unit is mounted.
装置を有することを特徴とするカメラ。4. A camera comprising the focus detection device according to claim 1, 2 or 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19582297A JPH1138312A (en) | 1997-07-22 | 1997-07-22 | Focus detector and camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19582297A JPH1138312A (en) | 1997-07-22 | 1997-07-22 | Focus detector and camera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1138312A true JPH1138312A (en) | 1999-02-12 |
Family
ID=16347585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19582297A Pending JPH1138312A (en) | 1997-07-22 | 1997-07-22 | Focus detector and camera |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1138312A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003015022A (en) * | 2001-06-29 | 2003-01-15 | Canon Inc | Range-finding device, range-finding method and control program |
| WO2016158040A1 (en) * | 2015-03-30 | 2016-10-06 | 富士フイルム株式会社 | Focus control device, lens device, imaging device, focus control method, focus control program |
-
1997
- 1997-07-22 JP JP19582297A patent/JPH1138312A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003015022A (en) * | 2001-06-29 | 2003-01-15 | Canon Inc | Range-finding device, range-finding method and control program |
| WO2016158040A1 (en) * | 2015-03-30 | 2016-10-06 | 富士フイルム株式会社 | Focus control device, lens device, imaging device, focus control method, focus control program |
| JPWO2016158040A1 (en) * | 2015-03-30 | 2017-07-20 | 富士フイルム株式会社 | Focus control device, lens device, imaging device, focus control method, focus control program |
| CN107407789A (en) * | 2015-03-30 | 2017-11-28 | 富士胶片株式会社 | Focusing control apparatus, lens assembly, camera device, focusing control method and focusing control program |
| US9918005B2 (en) | 2015-03-30 | 2018-03-13 | Fujifilm Corporation | Focusing control device, lens device, imaging apparatus, focusing control method, and focusing control program |
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