JPH01216306A - Focus detecting device having image pickup means - Google Patents
Focus detecting device having image pickup meansInfo
- Publication number
- JPH01216306A JPH01216306A JP4257488A JP4257488A JPH01216306A JP H01216306 A JPH01216306 A JP H01216306A JP 4257488 A JP4257488 A JP 4257488A JP 4257488 A JP4257488 A JP 4257488A JP H01216306 A JPH01216306 A JP H01216306A
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- Prior art keywords
- image pickup
- image
- pair
- focus
- image sensor
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- 210000001747 pupil Anatomy 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 claims description 33
- 238000003384 imaging method Methods 0.000 claims description 33
- 238000003491 array Methods 0.000 claims description 3
- 230000004907 flux Effects 0.000 abstract description 3
- 230000003287 optical effect Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は撮像手段を有した焦点検出装置に関し、特に撮
影レンズの瞳の異なった領域を通過した物体からの光束
を用いて物体像に関する複数の光量分布な撮像手段面上
に形成し、このとき得られる該撮像手段からの出力信号
を用いて対物レンズの焦点状態を検出するようにした所
謂位相差検出方式を利用した撮像手段を有した焦点検出
装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a focus detection device having an imaging means, and more particularly, to a focus detection device having an imaging means, and in particular to a focus detection device that detects multiple images of an object using light beams from an object that have passed through different areas of the pupil of a photographic lens. It has an imaging means using a so-called phase difference detection method, which is formed on the surface of the imaging means with a light intensity distribution of The present invention relates to a focus detection device.
（従来の技術）
従来より撮影レンズの焦点状態を検出する焦点検出装置
として例えば特開昭６０−４２７２３号公報等で提案さ
れているようにＣＣＤ等の撮像手段を用い、該撮像手段
からの撮像信号を利用した焦点検出装置がある。(Prior Art) Conventionally, as a focus detection device for detecting the focus state of a photographic lens, an imaging means such as a CCD is used as proposed in Japanese Patent Laid-Open No. 60-42723, etc., and an image is taken from the imaging means. There is a focus detection device that uses signals.
同公報では撮影レンズの一部を圧電素子等により微少振
動させ、撮影レンズの光軸方向の光路長を微少変化させ
ることにより、撮像素子面上に結像する画像をポカし、
このときの画像の結像状態を利用して焦点検出を行って
いる。According to the publication, by slightly vibrating a part of the photographic lens using a piezoelectric element, etc., and slightly changing the optical path length in the optical axis direction of the photographing lens, the image formed on the image sensor surface is focused.
Focus detection is performed using the imaging state of the image at this time.
第６図は同公報で提案されている焦点検出方式の原理を
示す説明図である。FIG. 6 is an explanatory diagram showing the principle of the focus detection method proposed in the publication.
同図において６１は圧電素子等の微少振動による出力波
形、６２ａ、６２ｂ、６２ｃは各々撮影レンズの一部の
微少振動による撮像信号に含まれる高周波成分のレベル
の変動値を示している。このうち出力信号６２ａが萌ピ
ン、出力信号６２ｂが合焦、出力信号６２ｃが後ビン状
態を表わす。In the figure, reference numeral 61 indicates an output waveform due to minute vibrations of a piezoelectric element, etc., and 62a, 62b, and 62c each indicate fluctuation values in the level of high frequency components contained in the image pickup signal due to minute vibrations of a part of the photographing lens. Among these, the output signal 62a represents the moe focus state, the output signal 62b represents the in-focus state, and the output signal 62c represents the rear bin state.
又６３はフォーカスリング位置による撮像信号に含まれ
る高周波成分のレベルの変位曲線、６４は合焦点である
。Further, 63 is a displacement curve of the level of high frequency components included in the imaging signal depending on the focus ring position, and 64 is a focused point.
同図の焦点検出方式においては合焦点方向の検知を高周
波成分のレベルの変動６２ａ、６２ｃか前ビン、後ビン
状態でその変動の位相を１８０゜反転させることにより
行っている。また合焦点検知を合焦点において撮像信号
に含まれる高周波成分のレベルが最大値トなる点、すな
わち高周波成分のレベルの変動６２ｂが最小となる位置
を検出することにより行っている。In the focus detection method shown in the figure, the direction of the focused point is detected by inverting the phase of the fluctuations 62a, 62c of the high frequency component level by 180 degrees in the front bin and rear bin states. In-focus point detection is performed by detecting the point at which the level of the high-frequency component included in the image pickup signal reaches its maximum value at the in-focus point, that is, the position where the fluctuation 62b in the level of the high-frequency component becomes the minimum.
しかしながらこの焦点検出方式は例えば被写体によって
、第６図の変位曲線６３が異なってくるために実際にフ
ォーカスレンズを移動させて、撮像信号に含まれる高周
波成分のレベルが最大を成る位置を捜さなければならず
、任意のフォーカスレンズの位置から合焦点までのフォ
ーカスレンズの移動量を前もって算出することができな
いという欠点を有している。However, with this focus detection method, the displacement curve 63 in FIG. 6 differs depending on the subject, so it is necessary to actually move the focus lens to find the position where the level of the high frequency component included in the image signal is at its maximum. However, this method has a drawback in that it is not possible to calculate in advance the amount of movement of the focus lens from an arbitrary focus lens position to the in-focus point.
この為カメラをパンニングしたときフォーカスレンズの
追従速度が遅く迅速なる撮影が出来ないという問題点が
あった。For this reason, when the camera is panned, the follow-up speed of the focus lens is slow, making it impossible to take quick pictures.
又撮影レンズの一部を微少振動させる為の圧電素子等の
アクチュエータを必要とし装置全体が複雑化してくる等
の問題点があった。In addition, an actuator such as a piezoelectric element is required to slightly vibrate a portion of the photographic lens, making the entire device complicated.
（発明が解決しようとする問題点）
本発明は撮像信号を発生する撮像手段面上の位置領域に
１対の撮像素子列より成る検出部を設け、該１対の撮像
素子列上に各々物体像に関する光量分布を形成し、該物
体像に関する光量分布の相対的位置を検出することによ
り、撮影レンズの合焦状態を迅速に、特に合焦位置まで
のフォーカス用レンズの移動量を演算しフォーカシング
の追従速度を向上させた可動部材のない簡易な構成の高
精度の撮像手段を有した焦点検出装置の提供を目的とす
る。(Problems to be Solved by the Invention) The present invention provides a detection section consisting of a pair of image pickup element rows in a position area on the surface of the image pickup means that generates an image pickup signal, and detects an object on each of the pair of image pickup element rows. By forming a light amount distribution regarding the image and detecting the relative position of the light amount distribution regarding the object image, the focusing state of the photographing lens can be quickly determined, especially focusing by calculating the amount of movement of the focusing lens to the in-focus position. It is an object of the present invention to provide a focus detection device having a highly accurate imaging means with a simple configuration and no movable members, which improves the tracking speed.
（問題点を解決するための手段）
撮影レンズの瞳の異なる領域を通過する物体からの光束
を導光手段により撮像１８号を発生する撮像手段面上の
１対の撮像素子列から成る検出部面上に導光し、該１対
の撮像素子列面上に各々物体像に関する光量分布を形成
し、該検出部により該１対・の撮像素子列面上に形成さ
れた物体像に関する光量分布の相対的位置関係を検出す
ることにより該撮影レンズの焦点状態を検出したことで
ある。(Means for Solving the Problems) A detection unit consisting of a pair of image pickup element rows on the surface of the image pickup means, which generates an image No. 18 by means of a light guide means, using a light guide means to generate an image 18 of a light beam from an object passing through different areas of the pupil of a photographic lens. Light is guided onto a surface to form a light amount distribution regarding an object image on each of the pair of image sensor array surfaces, and a light amount distribution regarding the object image formed by the detection section on the pair of image sensor array surfaces. The focus state of the photographic lens is detected by detecting the relative positional relationship between the two.
（実施例） 第１図は本発明の一実施例の光学系の概略図である。(Example) FIG. 1 is a schematic diagram of an optical system according to an embodiment of the present invention.
同図において８は撮影レンズ、１２は撮像信号を発生す
るＣＯＤ等の撮像手段であり複数の撮像素子ａ、〜ａｓ
より成る撮像素子列Ａと複数の撮像素子す、−ｂ、より
成る撮像素子列Ｂの１対の撮像素子列より成る検出部を
有している。１３は画像信号用の撮像素子である。１１
は対物レンズ８の予定結像面、６は導光手段であり複数
の微少レンズＦ１〜Ｆ５より成るレンズアレイより成フ
ている。本実施例では予定結像面１１はレンズアレイ６
の頂点面に相当している。９．１０は各々撮影レンズ８
の光軸Ｓに対する上側と下側を通過する光束、１４ａ、
１４ｂは各々ｉｌｌ影レンズ８の異なった瞳領域である
。In the figure, 8 is a photographing lens, 12 is an imaging means such as a COD that generates an imaging signal, and a plurality of imaging elements a, ~as
The detection unit includes a pair of image sensor arrays, an image sensor array A consisting of a plurality of image sensors A, and an image sensor array B consisting of a plurality of image sensors S, -B. 13 is an image sensor for image signals. 11
6 is a planned image forming surface of an objective lens 8, and 6 is a light guiding means, which is made up of a lens array consisting of a plurality of microlenses F1 to F5. In this embodiment, the planned imaging plane 11 is the lens array 6
corresponds to the vertex plane of 9.10 are each photographic lens 8
A luminous flux passing above and below the optical axis S, 14a,
14b are different pupil areas of the ill shadow lenses 8, respectively.
第２図は第１図の撮像手段１２の説明図である。同図に
おいてレンズアレイ６はフライアイレンズ等の５つの微
少レンズＦ１〜Ｆ５より構成されている。フは光路長補
正板であり撮像素子ａ、、ｂｎに入射する光束と撮像素
子１３に入射する光束との光路長を具整している。FIG. 2 is an explanatory diagram of the imaging means 12 of FIG. 1. In the figure, the lens array 6 is composed of five minute lenses F1 to F5, such as fly-eye lenses. F is an optical path length correction plate that adjusts the optical path lengths of the light beams incident on the image sensors a, . . . bn and the light beams incident on the image sensor 13.
撮像素子ａ。、ｂｏは各々レンズアレイ６の後方に配置
されており、微少レンズＦｎに対して撮像素子ａ。、ｂ
ｏが一対となって対応している。Image sensor a. , bo are respectively arranged behind the lens array 6, and the image sensor a is connected to the microlens Fn. ,b
o correspond to each other as a pair.
又撮像素子ａｔ”ａ、及び撮像素子す、〜ｂ５の画素ピ
ッチは撮像素子１３の約％である。Further, the pixel pitch of the image pickup device at''a and the image pickup devices S to B5 is about % of that of the image pickup device 13.
本実施例においては撮影レンズ８の瞳１４ａは撮像素子
す。と、又瞳１４ｂは撮像素子１４ｂとレンズアレイ６
を介して共役関係となっている。In this embodiment, the pupil 14a of the photographic lens 8 is an image sensor. Also, the pupil 14b is connected to the image sensor 14b and the lens array 6.
There is a conjugate relationship through .
撮影レンズ８の瞳領域１４ａを通過した光束９はレンズ
アレイ６を通過し、撮像素子列Ｂの各撮像素子ｂｎに入
射する。又瞳領域１４ｂを通過した光束ｌＯはレンズア
レイ６を通過し撮像素子列Ａの各撮像素子ａｎに入射す
る。The light beam 9 that has passed through the pupil area 14a of the photographing lens 8 passes through the lens array 6 and enters each image sensor bn of the image sensor array B. The light beam lO that has passed through the pupil region 14b passes through the lens array 6 and enters each image sensor an of the image sensor array A.
第３図は撮像手段１２の撮像素子列Ａと撮像素子列Ｂか
らの出力信号の説明図である。同図において曲線１５は
撮像素子列Ａからの出力信号、曲線１６は撮像素子列Ｂ
からの出力信号であり、これらの曲＆！Ｉ！１５，１６
は物体像に関する光量分布を示している。FIG. 3 is an explanatory diagram of output signals from the imaging element array A and the imaging element array B of the imaging means 12. In the figure, curve 15 is the output signal from image sensor array A, and curve 16 is the output signal from image sensor array B.
is the output signal from these songs &! I! 15, 16
indicates the light amount distribution regarding the object image.
第１図において対物レンズ８の焦点が予定結像面１１上
に合致しているときは撮像素子列Ａと撮像素子列Ｂから
の出力信号は同一となり第３図に示す曲線１５と曲線１
６は合致する。In FIG. 1, when the focus of the objective lens 8 coincides with the planned imaging plane 11, the output signals from the image sensor array A and the image sensor array B are the same, and the curve 15 and the curve 1 shown in FIG.
6 matches.
撮影レンズ８が合焦状態から外れデイフォーカス状態と
なった場合には撮像素子ａ。とｂｎの出力には差が生じ
、例えば第３図に示す様に曲線１４と曲線１５は、同図
に示す２分だけ物体像に関する光量分布がずれ、所謂像
ズレが生じる。この像ズレ量Ｚからある相関演算を行い
、像ズレ量に対する撮影レンズのデイフォーカス量を算
出し、フォーカスレンズの移動量を決定している。When the photographic lens 8 is out of focus and enters the day focus state, the image sensor a. A difference occurs between the outputs of and bn, and for example, as shown in FIG. 3, curves 14 and 15 have a light amount distribution with respect to the object image shifted by 2 minutes as shown in the same figure, resulting in so-called image shift. A certain correlation calculation is performed from this image shift amount Z, the day focus amount of the photographing lens is calculated with respect to the image shift amount, and the movement amount of the focus lens is determined.
また合焦点方向の検知は前ピン、後ビンで曲線１４と曲
線１５の相対的左右位置が逆転することを用いて行なっ
ている。Further, the direction of the in-focus point is detected by using the fact that the relative left and right positions of the curves 14 and 15 are reversed between the front focus and the rear focus.
本実施例では以上のような方法により撮影レンズの焦点
検知を行っている。In this embodiment, the focus of the photographic lens is detected by the method described above.
第１図に示す焦点検出方式ではレンズアレイ６の［１点
面に撮影レンズ８の予定結像面が位置したとき合焦と判
断している。この為撮像手段１２面上では画像が多少デ
イフォーカスした状態となっている。In the focus detection method shown in FIG. 1, in-focus is determined when the expected imaging plane of the photographing lens 8 is located on the [1-point plane] of the lens array 6. For this reason, the image on the surface of the imaging means 12 is in a somewhat defocused state.
そこでこのときのデイフォーカス量が問題となる場合に
は、例えば第３図に示す曲線１４と曲線１５とが一致し
たときに合焦とせず、例えば第４図に示すようにレンズ
アレイ６の頂点面６ａと撮像手段面１２の間隔分だけ前
ピンとなったときに合焦と判断するように合焦点をシフ
トするようにしても良い。Therefore, if the amount of day focus at this time is a problem, for example, when the curve 14 and the curve 15 shown in FIG. The focal point may be shifted so that it is determined that the image is in focus when the front focus is equal to the distance between the surface 6a and the imaging means surface 12.
本実施例ではレンズアレイ６の後方に配置した撮像素子
ａ１〜ａ １．＊ ｂ ｌ〜ｂ５の領域とそれ以外の撮
像手段１２面上の領域、例えば撮像素子１３が存在する
領域とでは撮影レンズの結像面がレンズアレイ６の屈折
力による影響で撮像素子ａ１〜ａ Ｓ 、ｂ ｌ〜ｂ５
の領域の方が撮像素子１３の領域に比べ光学的に前方に
位置してくる。In this embodiment, the image sensors a1 to a1. are arranged behind the lens array 6. * In the areas b l to b5 and other areas on the surface of the imaging means 12, for example, the area where the image sensor 13 is present, the image forming surface of the photographic lens is affected by the refractive power of the lens array 6, and the imaging elements a1 to a S, bl~b5
The area is located optically in front of the area of the image sensor 13.
このときの位置の差が問題となる場合には例えば第１図
、第４図に示すようにレンズアレイ６の後方に光路長補
正板７を設けるのが良い。If the difference in position at this time is a problem, it is preferable to provide an optical path length correction plate 7 behind the lens array 6, as shown in FIGS. 1 and 4, for example.
次に本実施例の撮影時における各要素の一連の動作を述
べる。本実施例においては撮像素子ａｔ〜ａ ｌｉ 、
ｂＩ〜ｂ５を焦点検出用の測距素子としてばかりではな
く撮影用に用いている。即ち撮像素子ａ１と１）ｌｘａ
２とｂ ２ 、ａ ３とす、−・・−−−−−−ａ ｎ
とす。を一対としてａ。とす。の出力信号をたし合わせ
たものを撮像素子の１画素の出力として取り扱っている
。Next, a series of operations of each element during photographing in this embodiment will be described. In this embodiment, the image sensors at to a li ,
bI to b5 are used not only as distance measuring elements for focus detection but also for photographing. That is, image sensor a1 and 1) lxa
2 and b 2 , a 3 and --------a n
And. As a pair, a. And. The sum of the output signals is treated as the output of one pixel of the image sensor.
第５図はこのときの信号処理を示すブロック図である。FIG. 5 is a block diagram showing signal processing at this time.
第５図において１７はスイッチング回路、１８は遅延回
路、１９は加算器、２０はシフトレジスター、２１はア
ンプ、２２は信号処理回路、２３は焦点検出信号処理回
路、２４はモーター制御回路、２５はモーターである。In FIG. 5, 17 is a switching circuit, 18 is a delay circuit, 19 is an adder, 20 is a shift register, 21 is an amplifier, 22 is a signal processing circuit, 23 is a focus detection signal processing circuit, 24 is a motor control circuit, and 25 is a It's a motor.
撮像素子ａ、〜ａ Ｓ ％ ｂ ｌ ””’ ｂ５で発
生した信号出力は、まず、スイッチング回路１７へと送
られる。このスイッチング回路１７により焦点検出に使
用された撮像素子からの出力信号は焦点検出信号処理回
路２３に送られ、ここで焦点検出のための相関演算等を
行った後に、フォーカスレンズの移動量を指示する信号
をモーター制御回路２４へ送る。そして、モーター制御
回路がモーター２５の動きをｉ＋Ｉｊ御することにより
自動焦点検出を行っている。The signal output generated by the image sensor a, ~a S % b l ""' b5 is first sent to the switching circuit 17 . The switching circuit 17 sends the output signal from the image sensor used for focus detection to the focus detection signal processing circuit 23, where it performs correlation calculations for focus detection, and then instructs the amount of movement of the focus lens. A signal is sent to the motor control circuit 24. Then, the motor control circuit performs automatic focus detection by controlling the movement of the motor 25 i+Ij.
また前述したスイッチング回路１７に右いて焦点検出に
使用されていない例えば撮像素子１３からの出力（３号
はスイッチング回路１７を素通りする形で加算器１９へ
と送られる。加算ｐＪ１９では撮像素子ａ１とｂ ）
Ｉ ａ ２とｂ ２ ＊ ａ３とｂ３−・・・−−ａｎ
とｂｎと言った、となり合う一対のセンサー出力をたし
合わせた後、シフトレジスター２０へと信号を送ってい
る。これはとなり合う一対のセンサーな撮像素子の一画
素と考えた場合、撮像素子内の全画素の感度を一定にす
るための処置である。すなわち撮影された画像を見た時
に焦点検出に使用した部分と、それ以外の部分の見え方
が異なる事を防ぐためである。Further, the output (No. 3) from the image sensor 13, which is located on the right side of the switching circuit 17 and is not used for focus detection, is sent to the adder 19 without passing through the switching circuit 17. b)
I a 2 and b 2 * a3 and b3------an
After adding up the outputs of a pair of adjacent sensors, a signal is sent to the shift register 20. This is a measure to make the sensitivity of all pixels in the image sensor constant, when considered as one pixel of an image sensor that is a pair of adjacent sensors. In other words, this is to prevent the portion used for focus detection from appearing differently from the other portions when viewing the photographed image.
又撮像素子１３から発生した撮像信号は撮像素子ａ＋”
−ａｓ、ｂ＋”’ｂｓから発生した信号がシフトレジス
ター２０に到達する時間と撮像素子１３から直接シフト
レジスター２０へ到達する時間が無視できないほどの違
いを生じる場合には遅延回路１８を介してシフトレジス
ター２０に送るようにしている。In addition, the image signal generated from the image sensor 13 is the image sensor a+"
-as, b+"'bs If the time for the signal to arrive at the shift register 20 and the time for the signal to arrive directly from the image sensor 13 to the shift register 20 is too large to ignore, the signal is shifted via the delay circuit 18. I am trying to send it to register 20.
（発明の効果）
本発明によれば撮像手段面上の一領域に１対の撮像素子
列より成る検出部を設は該検出部より物体像に関する光
量分布の相対的位置を検出することにより、フォーカス
用レンズの移動量を求め合焦状態を迅速に得、しかも可
動部材のない簡易な構成の高蹟度の撮像手段を有した焦
点検出装置を達成することができる。(Effects of the Invention) According to the present invention, a detecting section consisting of a pair of image capturing element rows is provided in one area on the surface of the image capturing means, and by detecting the relative position of the light amount distribution regarding the object image from the detecting section, It is possible to obtain a focus detection device that quickly obtains a focused state by determining the amount of movement of a focusing lens, and that has a simple configuration with no movable members and a high-performance imaging means.
第１図は本発明の一実施例の光学系の概略図、第２図は
第１図の一部分の説明図、第３図は第１図の検出部より
得られる出力信号の説明図、第４図は本発明の他の一実
施例の光学系の概略図、第５図は本発明に係る撮像手段
にあける信号処理のプσツク図、第６図は従来の焦点検
出装置における出力信号の説明図である。
図中８は撮影レンズ、１１は予定結像面、６はレンズア
レイ、７は光路長補正板、１２は撮像手段、ａ、 〜ｊ
１５．ｂ、 〜ｂｓ、１３は撮像素子、１４ａ、１４ｂ
は瞳、９，１０は光束である。
特許出願人 キャノン株式会社FIG. 1 is a schematic diagram of an optical system according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of a part of FIG. FIG. 4 is a schematic diagram of an optical system according to another embodiment of the present invention, FIG. 5 is a schematic diagram of a signal processing process performed in the imaging means according to the present invention, and FIG. 6 is an output signal of a conventional focus detection device. FIG. In the figure, 8 is a photographing lens, 11 is a planned imaging plane, 6 is a lens array, 7 is an optical path length correction plate, 12 is an imaging means, a, to j
15. b, ~bs, 13 is an image sensor, 14a, 14b
is a pupil, and 9 and 10 are luminous fluxes. Patent applicant Canon Co., Ltd.
Claims (3)
の光束を導光手段により撮像信号を発生する撮像手段面
上の１対の撮像素子列から成る検出部面上に導光し、該
１対の撮像素子列面上に各々物体像に関する光量分布を
形成し、該検出部により該１対の撮像素子列面上に形成
された物体像に関する光量分布の相対的位置関係を検出
することにより該撮影レンズの焦点状態を検出したこと
を特徴とする撮像手段を有した焦点検出装置。(1) A light beam from an object passing through different areas of the pupil of the photographic lens is guided by a light guiding means onto a detection surface consisting of a pair of image sensor arrays on the surface of the imaging means that generates an imaging signal, and forming a light quantity distribution regarding the object image on each of the pair of image pickup element array surfaces, and detecting a relative positional relationship of the light quantity distribution regarding the object image formed on the pair of image pickup element array surfaces by the detection section; 1. A focus detection device having an imaging means, characterized in that the focus state of the photographing lens is detected by:
アレイより構成されており、前記１対の撮像素子列は該
複数の微少レンズ毎に設けた１対の撮像素子より構成さ
れていることを特徴とする請求項１記載の撮像手段を有
した焦点検出装置。(2) The light guide means is composed of a lens array made up of a plurality of microlenses, and the pair of image sensor arrays is composed of a pair of imaging elements provided for each of the plurality of microlenses. A focus detection device having an imaging means according to claim 1.
の双方の撮像素子からの出力信号の和を撮像信号とした
ことを特徴とする請求項２記載の撮像手段を有した焦点
検出装置。(3) Focus detection with the imaging means according to claim 2, characterized in that the sum of output signals from both image sensors of a pair of image sensors provided for each of the plurality of microlenses is used as the image signal. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4257488A JPH01216306A (en) | 1988-02-24 | 1988-02-24 | Focus detecting device having image pickup means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4257488A JPH01216306A (en) | 1988-02-24 | 1988-02-24 | Focus detecting device having image pickup means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01216306A true JPH01216306A (en) | 1989-08-30 |
Family
ID=12639834
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4257488A Pending JPH01216306A (en) | 1988-02-24 | 1988-02-24 | Focus detecting device having image pickup means |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01216306A (en) |
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