JPS6355690B2 - - Google Patents
Info
- Publication number
- JPS6355690B2 JPS6355690B2 JP55150789A JP15078980A JPS6355690B2 JP S6355690 B2 JPS6355690 B2 JP S6355690B2 JP 55150789 A JP55150789 A JP 55150789A JP 15078980 A JP15078980 A JP 15078980A JP S6355690 B2 JPS6355690 B2 JP S6355690B2
- Authority
- JP
- Japan
- Prior art keywords
- focus
- degree
- inverting amplifier
- display element
- light emitting
- 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
Links
- 238000000034 method Methods 0.000 claims description 8
- 239000003086 colorant Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Vision & Pattern Recognition (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Indication In Cameras, And Counting Of Exposures (AREA)
- Automatic Focus Adjustment (AREA)
Description
【発明の詳細な説明】
この発明はカメラの自動焦点調節（オートフオ
ーカス）装置における合焦度表示方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for displaying the degree of focus in an autofocus device for a camera.
近年、スチールカメラ、シネカメラ、ビデオカ
メラ等の各種カメラにおいて、ピント合わせの自
動化を計るために自動焦点調節装置が種々開発さ
れ、実用化されつつある。 2. Description of the Related Art In recent years, various automatic focus adjustment devices have been developed and are being put into practical use in order to automate focusing in various cameras such as still cameras, cine cameras, and video cameras.
このような自動焦点調節装置において、従来か
ら合焦のみを表示したり、合焦、前ピン、後ピン
を別個の表示素子によつて表示することは行われ
ていたが、合焦又はピンボケの度合（これを本明
細書中では「合焦度」という）を知ることができ
ず不便であり、また表示素子を多く使用すること
はスペース上の無理が生ずるばかりか視認性も悪
くなる。 In such automatic focus adjustment devices, it has conventionally been possible to display only the in-focus state, or to display in-focus, front focus, and back focus using separate display elements; It is inconvenient because it is not possible to know the degree of focus (this is referred to as "degree of focus" in this specification), and using a large number of display elements not only takes up space but also worsens visibility.
この発明は、上記の問題を解決するためになさ
れたもので、合焦度表示素子として発光色の異な
る２個の発光ダイオードを１チツプ上に積層形成
するが、少くとも１個のパツケージ内に近接配置
した、連続して色を変えられる表示素子を用い、
自動焦点調節装置の信号処理回路から出力される
合焦度に応じた出力信号によつて、表示素子を構
成する２個の発光ダイオードの発光割合を変化さ
せ、その混合色の色調によつて合焦度を表示しよ
うとするものである。 This invention was made in order to solve the above problem. Two light emitting diodes with different emission colors are stacked on one chip as a focus degree display element, and at least one light emitting diode is stacked in one package. Using closely spaced display elements that can continuously change color,
The light emitting ratio of the two light emitting diodes that make up the display element is changed by the output signal output from the signal processing circuit of the automatic focus adjustment device according to the degree of focus, and the tone of the mixed color is used to adjust the focus. This is intended to display focus.
以下、添付図面を参照してこの発明の実施例を
説明する。 Embodiments of the present invention will be described below with reference to the accompanying drawings.
第１図は、この発明を適用すべき自動焦点調節
装置の一例を示す概念図である。 FIG. 1 is a conceptual diagram showing an example of an automatic focus adjustment device to which the present invention is applied.
この装置は、１対の測距用のレンズ１，２と、
それに対応する複数個の受光素子をならべて配置
した１対の検出装置３，４と、信号処理回路（比
較演算回路等）５と、制御回路６と、その出力に
応じて撮影レンズ８及び一方の測距用レンズ２を
連動して矢示方向へ駆動する駆動装置７とから成
つている。なお、図中９は被写体、１０はフイル
ム面である。 This device includes a pair of distance measuring lenses 1 and 2,
A pair of detection devices 3 and 4 each having a plurality of corresponding light-receiving elements arranged side by side, a signal processing circuit (comparison calculation circuit, etc.) 5, a control circuit 6, and a photographing lens 8 and one side depending on the output thereof. and a driving device 7 that interlocks and drives the distance measuring lens 2 in the direction of the arrow. In the figure, numeral 9 represents a subject, and numeral 10 represents a film surface.
検出装置３の共同端子には正電圧（＋Ｖ）が、
検出装置４の共同端子には負電圧（−Ｖ）が夫々
印加され、両検出装置３，４の対応する各受光素
子からは逆極性の検出出力が得られる。一方、測
距用レンズ２は矢示のように光軸に垂直な方向に
走査され、かつ撮影レンズ８の光軸方向の走査と
連動する。そして、被写体９の１点Ｐが各検出装
置３，４上の対応する受光素子に像を結んだ時、
撮影レンズ８による点Ｐの像P′がフイルム面１０
上に結像するようになつている。 A positive voltage (+V) is applied to the common terminal of the detection device 3.
A negative voltage (-V) is applied to the common terminal of the detection device 4, respectively, and detection outputs of opposite polarity are obtained from the corresponding light receiving elements of both the detection devices 3 and 4. On the other hand, the distance measuring lens 2 is scanned in a direction perpendicular to the optical axis as shown by the arrow, and is interlocked with the scanning of the photographic lens 8 in the optical axis direction. Then, when one point P on the subject 9 focuses on the corresponding light receiving element on each of the detection devices 3 and 4,
Image P' of point P by photographing lens 8 is on film surface 10
The image is now focused upwards.
したがつて、検出装置３と４の対応する各受光
素子の合成出力Ａ，Ｂ，Ｃ，Ｄが夫々０になつた
時合焦したことになる。そこで、この出力Ａ，
Ｂ，Ｃ，Ｄが信号処理回路５に入力され加算、正
値化され、合焦度を示す出力信号Ｆとして出力さ
れる。 Therefore, when the combined outputs A, B, C, and D of the corresponding light-receiving elements of the detection devices 3 and 4 each become 0, the object is in focus. Therefore, this output A,
B, C, and D are input to the signal processing circuit 5, added, converted into positive values, and outputted as an output signal F indicating the degree of focus.
制御回路６はモータ等の駆動装置７を制御し
て、測距用レンズ２及び撮影レンズ８を夫々矢示
Ｆ又はＲ方向に走査し、信号Ｆが０又は極小値に
なつた時に停止させる。このようにして合焦状態
を得ることができる。なお、信号処理回路５から
の出力信号Ｆは、ピントはずれの度合が大きい程
大きく（電圧信号が高く）なることは勿論であ
り、正値化されているので、前ピンの場合も後ピ
ンの場合も正の出力信号である。 The control circuit 6 controls a drive device 7 such as a motor to scan the distance measuring lens 2 and the photographing lens 8 in the direction of the arrow F or R, respectively, and stops the scanning when the signal F reaches 0 or a minimum value. In this way, a focused state can be obtained. It should be noted that the output signal F from the signal processing circuit 5 naturally increases as the degree of defocus increases (the voltage signal becomes higher), and since it is converted into a positive value, the output signal F from the signal processing circuit 5 increases as the degree of focus increases. It is also a positive output signal.
第２図は、上述のような自動焦点調節装置にこ
の発明を適用した実施例の回路図である。 FIG. 2 is a circuit diagram of an embodiment in which the present invention is applied to an automatic focus adjustment device as described above.
図中、１１は反転増幅器で、オペアンプOP1
と、その反転入力端子に接続された入力抵抗R1、
帰還抵抗R2、及び接地抵抗R3とからなる。１２
は非反転増幅器で、オペアンプOP2と、その非反
転入力端子に接続された入力抵抗R4、帰還抵抗
R5、及び接地抵抗R6とから成る。 In the figure, 11 is an inverting amplifier, operational amplifier OP 1
and the input resistor R 1 connected to its inverting input terminal,
It consists of a feedback resistor R 2 and a ground resistor R 3 . 12
is a non-inverting amplifier, consisting of an operational amplifier OP 2 , an input resistor R 4 connected to its non-inverting input terminal, and a feedback resistor.
R 5 and ground resistance R 6 .
１３は１つのパツケージ内に緑色発光の発光ダ
イオード（以下「LED」と略称する）DGと赤色
発光のLED DRとが近接配置された表示素子であ
り、２つのLED DGとDRが共に発光している時に
はその混合色（黄色、橙色等）で発光して見える
ようになつている。したがつて、表示素子１３を
構成する２個のLED DGとDRに加える順方向電圧
（電流）を変えることにより両LEDの発光割合を
変化させ、表示素子１３の発光色調を連続的に変
化させることができる。 13 is a display element in which a green light emitting diode (hereinafter abbreviated as "LED") D G and a red light emitting LED D R are placed close together in one package, and the two LEDs D G and D R are arranged close together. When they emit light together, they appear to emit a mixed color (yellow, orange, etc.). Therefore, by changing the forward voltage (current) applied to the two LEDs D G and D R that make up the display element 13, the light emission ratio of both LEDs can be changed, and the color tone of the light emission of the display element 13 can be continuously changed. It can be changed.
なお、この表示素子１３として、近年開発され
た、赤色LED DR上に緑色LED DGを積み重ねて
１チツプに構成したものを用いてもよいことは勿
論である。 It is of course possible to use a display element 13 that has been developed in recent years, in which a green LED DG is stacked on a red LED DR to form a single chip.
そして、自動焦点調節装置の信号処理回路５か
らの合焦度に応じた出力信号Ｆを反転増幅器１１
及び非反転増幅器１２に入力し、この反転増幅器
１１の出力を保護抵抗R7を介して表示素子１３
の緑色LED DGの陽極側に、非反転増幅器１２の
出力を保護抵抗R8を介して赤色LED DRの陽極側
に夫々印加し、両LED DG，DRの陰極側は接地し
てある。 Then, the output signal F corresponding to the degree of focus from the signal processing circuit 5 of the automatic focus adjustment device is sent to an inverting amplifier 11.
and a non-inverting amplifier 12, and the output of this inverting amplifier 11 is input to the display element 13 via a protective resistor R7.
The output of the non-inverting amplifier 12 is applied to the anode side of the green LED DG , and the output of the non-inverting amplifier 12 is applied to the anode side of the red LED DR through the protective resistor R8, and the cathode sides of both LEDs DG and DR are grounded. be.
したがつて、信号処理回路５の出力Ｆがゼロ又
は極小の時、すなわち合焦時には、反転増幅器１
１の出力O1は最大（電圧が最高）となり、非反
転増幅器１１の出力O2は最小（電圧がゼロ又は
最低）となる。そのため、緑色LED DGが最大発
光し、赤色LED DRは発光せず、表示素子１３は
緑色に見える。 Therefore, when the output F of the signal processing circuit 5 is zero or minimum, that is, when focusing, the inverting amplifier 1
The output O 1 of the non-inverting amplifier 11 is the maximum (the voltage is the highest), and the output O 2 of the non-inverting amplifier 11 is the minimum (the voltage is zero or the lowest). Therefore, the green LED DG emits maximum light, the red LED DR does not emit light, and the display element 13 appears green.
ピンボケの状態ではその度合に応じて信号処理
回路５の出力Ｆが大きくなるので、反転増幅器１
１の出力O1が小さくなり、非反転増幅器１２の
出力O2が大きくなる。そのため、緑色LED DGの
発光量が減り、赤色LED DRが発光してボケの度
合が大きい程発光量が増す。 In a state of out-of-focus, the output F of the signal processing circuit 5 increases depending on the degree of defocus, so the inverting amplifier 1
The output O 1 of the non-inverting amplifier 12 becomes small, and the output O 2 of the non-inverting amplifier 12 becomes large. Therefore, the amount of light emitted from the green LED DG decreases, and the amount of light emitted from the red LED DR increases as the degree of blur increases.
したがつて、ややピントはずれの状態では両
LED DG，DRが略同様に発光して表示素子１３が
その混合色による黄色に見え、全くピンボケの状
態では赤色LED DRのみが発光し、表示素子１３
が赤く見えることになる。 Therefore, when the focus is slightly out of focus, both
The LEDs D G and D R emit light in almost the same way, and the display element 13 appears yellow due to the mixed color. In a completely out-of-focus state, only the red LED D R emits light, and the display element 13
will appear red.
このように、合焦度に応じて表示素子の色調が
連続的に変化するのでピント状態を適確に判断で
きる。したがつて、例えば焦点深度の高い撮影時
には完全に合焦しなくても撮影できるのでシヤツ
タチヤンスを生かせるなどの効果がある。また、
自動焦点調節装置の駆動系を切り離して、手動で
ピント合せを行なう場合にも、フオーカスリング
の回動方向や回動量を判断するのに極めて有効で
ある。 In this way, since the color tone of the display element changes continuously according to the degree of focus, the state of focus can be determined accurately. Therefore, for example, when photographing with a high depth of focus, it is possible to take a photograph without having to focus completely, so that it is possible to take advantage of the shutter stability. Also,
This is extremely effective in determining the direction and amount of rotation of the focus ring even when the drive system of the automatic focus adjustment device is separated and manual focusing is performed.
なお、自動焦点調節装置としては上述の方式に
限るものではなく、種々の方式のものに適用でき
る。そして、信号処理回路からの合焦度に応じた
出力信号Ｆが合焦時に極大になる方式の場合に
は、第２図における発光素子１３の緑色LED DG
と赤色LED DRとを入れ換えればよい。また、出
力信号Ｆが合焦時にはゼロであるが前ピンの時に
は正、後ピンの時には負（又はその逆）になる場
合には、それを絶対値回路を介して正値化して反
転増幅器１１及び非反転増幅器１２に入力させれ
ばよい。 Note that the automatic focus adjustment device is not limited to the above-mentioned method, and can be applied to various methods. In the case of a method in which the output signal F corresponding to the degree of focus from the signal processing circuit is maximized at the time of focus, the green LED D G of the light emitting element 13 in Fig. 2 is used.
and the red LED D R. In addition, if the output signal F is zero when the focus is focused, but becomes positive when the front focus is focused, and negative when the rear focus is focused (or vice versa), it is converted into a positive value via the absolute value circuit and the inverting amplifier 11 and input it to the non-inverting amplifier 12.
さらにまた、合焦度を示す出力信号Ｆがデジタ
ル信号で出力される場合は、それをＤ−Ａ変換器
を介してアナログ信号に変換して反転増幅器１１
及び非反転増幅器１２に入力させればよい。 Furthermore, when the output signal F indicating the degree of focus is output as a digital signal, it is converted to an analog signal via a D-A converter and then sent to the inverting amplifier 11.
and input it to the non-inverting amplifier 12.
この発明はまた、第１図に示した例のように撮
影光束とは別の光束によつて焦点検出（測距）す
る方式ではなく、撮影光束の一部を利用して焦点
検出するいわゆるTTL方式の自動焦点調節装置
の合焦度表示方法としても同様に実施し得ること
は勿論である。 This invention also uses a so-called TTL method in which focus is detected using a part of the photographing light beam, rather than the method of detecting focus (distance measurement) using a light beam different from the photographing light beam as in the example shown in FIG. It goes without saying that the present invention can be similarly implemented as a method for displaying the degree of focus in an automatic focusing device of this type.
第１図はこの発明を適用すべき自動焦点調節装
置の一例を示す概念図、第２図はこの発明の一実
施例を示す回路図である。
１，２……測距用レンズ、３，４……検出装
置、５……信号処理回路、６……制御回路、７…
…駆動装置、８……撮影レンズ、９……被写体、
１０……フイルム面、１１……反転増幅器、１２
……非反転増幅器、１３……表示素子、DG……
緑色発光ダイオード、DR……赤色発光ダイオー
ド。
FIG. 1 is a conceptual diagram showing an example of an automatic focus adjustment device to which the present invention is applied, and FIG. 2 is a circuit diagram showing an embodiment of the present invention. 1, 2... Lens for distance measurement, 3, 4... Detection device, 5... Signal processing circuit, 6... Control circuit, 7...
...Drive device, 8...Photographing lens, 9...Subject,
10...Film surface, 11...Inverting amplifier, 12
...Non-inverting amplifier, 13...Display element, D G ...
Green light emitting diode, D R ... Red light emitting diode.
Claims (1)
素子として発光色の異なる２個の発光ダイオード
が１チツプ又は１個のパツケージ内に配置された
表示素子を用い、合焦度に応じた出力信号によつ
て前記２個の発光ダイオードの発光割合を変化さ
せ、その混合色の色調によつて合焦度を表示する
ことを特徴とする合焦度表示方法。1. In an automatic focus adjustment device, a display element in which two light emitting diodes with different emission colors are arranged in one chip or one package is used as the focus degree display element, and an output signal according to the focus degree is used. Therefore, a method for displaying a degree of focus, characterized in that the light emitting ratio of the two light emitting diodes is changed, and the degree of focus is displayed by the tone of the mixed color.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55150789A JPS5774711A (en) | 1980-10-29 | 1980-10-29 | In-focus degree displaying method of automatic focus adjustment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55150789A JPS5774711A (en) | 1980-10-29 | 1980-10-29 | In-focus degree displaying method of automatic focus adjustment device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5774711A JPS5774711A (en) | 1982-05-11 |
| JPS6355690B2 true JPS6355690B2 (en) | 1988-11-04 |
Family
ID=15504461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55150789A Granted JPS5774711A (en) | 1980-10-29 | 1980-10-29 | In-focus degree displaying method of automatic focus adjustment device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5774711A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5145556A (en) * | 1974-10-17 | 1976-04-19 | Ricoh Kk | Kyorikenshutsu hoho oyobi sochi |
-
1980
- 1980-10-29 JP JP55150789A patent/JPS5774711A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5145556A (en) * | 1974-10-17 | 1976-04-19 | Ricoh Kk | Kyorikenshutsu hoho oyobi sochi |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5774711A (en) | 1982-05-11 |
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