JPS63167315A - Device for detecting displacement amount of lens - Google Patents
Device for detecting displacement amount of lensInfo
- Publication number
- JPS63167315A JPS63167315A JP31144386A JP31144386A JPS63167315A JP S63167315 A JPS63167315 A JP S63167315A JP 31144386 A JP31144386 A JP 31144386A JP 31144386 A JP31144386 A JP 31144386A JP S63167315 A JPS63167315 A JP S63167315A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- light
- light emitting
- scale
- focus 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
- 238000006073 displacement reaction Methods 0.000 title claims description 11
- 230000003287 optical effect Effects 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 abstract description 18
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Landscapes
- Automatic Focus Adjustment (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はレンズ変位量検出装置に関し、一層詳細には、
測距データに基づいてフォーカスレンズが所定量移動さ
れたか否かを測定するためのレンズ変位量検出装置に関
するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a lens displacement detection device, and more specifically,
The present invention relates to a lens displacement amount detection device for measuring whether a focus lens has been moved by a predetermined amount based on distance measurement data.
（背景技術）
現在の自動焦点カメラは、測距装置による測距データに
基づいてフォーカスレンズを所定量移動させて合焦させ
る機能を有するものがほとんどである。(Background Art) Most current autofocus cameras have a function of moving a focus lens by a predetermined amount based on distance measurement data from a distance measurement device to focus.
したがって精確な合焦を行うためには、測距装置が精度
のよいものであることはもちろんであるが、当該測距装
置によって得られた測距データ通りにフォーカスレンズ
が移動されるか否か、すなわちフォーカスレンズ駆動装
置が精確に作動するか否かも重要な要素となる。Therefore, in order to achieve accurate focusing, it goes without saying that the distance measuring device must be highly accurate, but it is also necessary to ensure that the focus lens is moved in accordance with the distance measurement data obtained by the distance measuring device. That is, whether or not the focus lens driving device operates accurately is also an important factor.
このフォーカスレンズ駆動装置が精度のよいものである
か否かは、レンズ変位量検出装置によって実際のレンズ
の移動量を測定することによって確認される。Whether or not this focus lens driving device has good accuracy is confirmed by measuring the actual amount of movement of the lens using a lens displacement amount detection device.
従来においてこのようなレンズ変位量検出装置は、接触
式の電気マイクロマグネスケールが一般的に用いられて
いた。Conventionally, a contact-type electric micromagnescale has generally been used as such a lens displacement amount detection device.
（発明が解決しようとする問題点）
しかるに上記従来のレンズ変位量検出装置には次のよう
な問題点があった。(Problems to be Solved by the Invention) However, the conventional lens displacement detection device described above has the following problems.
すなわち、従来のものにおいては測定部がレンズ表面に
接触する接触式のものであるため、レンズ表面を傷付け
るおそれがあった。That is, in the conventional device, since the measuring section is of a contact type in contact with the lens surface, there is a risk of damaging the lens surface.
またレンズ表面に測定部が接触する際の測定部の接触具
合、すなわちレンズ表面への測定部の被押圧力にばらつ
きが生じ、これがそのまま測定誤差となってあられれる
という問題点があった。Further, there is a problem that variations occur in the degree of contact of the measuring section when the measuring section contacts the lens surface, that is, the force with which the measuring section is pressed against the lens surface, and this can directly lead to measurement errors.
さらにはレンズ表面が球面であるため、測定部のレンズ
表面への接触位置のばらつき等によっても測定誤差が生
じるなど、計測が非常に難かしいという問題点があった
。Furthermore, since the lens surface is spherical, measurement errors occur due to variations in the contact position of the measuring unit to the lens surface, making measurement extremely difficult.
本発明は上記問題点を解消すべくなされたものであり、
その目的とするところは、測定がレンズ表面に非接触で
行えるのでレンズ表面を傷付けることがなく、また極め
て精確な測定が行えるレンズ変位量検出装置を提供する
にある。The present invention has been made to solve the above problems,
The object of the present invention is to provide a lens displacement amount detection device that can perform measurement without contacting the lens surface, does not damage the lens surface, and can perform extremely accurate measurement.
（発明の概要）
上記目的による本発明に係るレンズ変位量検出装置は次
の構成を備える。(Summary of the Invention) A lens displacement amount detection device according to the present invention for the above purpose has the following configuration.
すなわち、被検物たるフォーカスレンズの前方光軸上に
配置され、フォーカスレンズ面に向けて光を照射する投
光ランプを具備すると共に、該投光ランプから照射され
、フォーカスレンズ面で反射された反射光を検出する受
光センサを具備する投受光部と、該投受光部をフォーカ
スレンズ前方の光軸上を移動させる駆動部と、前記投受
光部の移動経路と平行に配置され、投受光部の位置を検
出するスケールと、 フォーカスレンズの基準位置にお
いて、前期駆動部によって光軸上を投受光部が移動され
る際、投受光部によって検出されるフォーカスレンズか
らの反射光量が基準量になった位置での投受光部のスケ
ール上の位置と、フォーカスレンズが所定量移動された
位置で、同じく前記駆動部によって光軸上を投受光部が
移動される際、投受光部によって検出されるフォーカス
レンズからの反射光量が上記基準量になった位置での投
受光部のスケール上の位置とを読み取り、スータール上
の上記両位置差をフォーカスレンズの移、動量として算
出する制御部とを備えて成ることを特徴とする。That is, it is provided with a floodlight lamp that is placed on the front optical axis of the focus lens that is the object to be inspected and irradiates light toward the focus lens surface, and the light that is irradiated from the floodlight lamp and reflected on the focus lens surface is provided. a light emitting/receiving section including a light receiving sensor for detecting reflected light; a driving section for moving the light emitting/receiving section on the optical axis in front of the focus lens; At the reference position of the focus lens, when the light emitting and receiving part is moved on the optical axis by the first drive part, the amount of reflected light from the focus lens detected by the light emitting and receiving part becomes the reference amount. The position of the light emitting/receiving section on the scale at the position where the light emitting/receiving section is moved and the position where the focus lens is moved by a predetermined amount are detected by the light emitting/receiving section when the light emitting/receiving section is similarly moved on the optical axis by the driving section. and a control unit that reads the position of the light emitting/receiving unit on the scale at the position where the amount of reflected light from the focus lens reaches the reference amount, and calculates the difference between the two positions on the suitar as the amount of movement of the focus lens. It is characterized by consisting of:
（作用） 作用について説明する。(effect) The effect will be explained.
まず、レンズｌＯの基準位置、例えば無限距離位置し１
におけるレンズ１０からの反射光を検出する。First, the reference position of the lens lO, for example, the infinite distance position 1
The reflected light from the lens 10 at is detected.
すなわち、駆動部によって投受光筒１２を移動させ、レ
ンズ１０からの反射光を受光センサ１８によって連続的
に検出し、受光センサ１８からの出力信号レベルがあら
かじめ制御部２２（ＭＰＵ）に入力されている基準値Ｒ
に等しい位置で投受光筒１２を停止させ、そのときのス
ケール２０上の値ρ１を読み取る。投受光ｆｆ１１２は
初期の位置まで戻される。That is, the light emitting/receiving tube 12 is moved by the driving section, the reflected light from the lens 10 is continuously detected by the light receiving sensor 18, and the output signal level from the light receiving sensor 18 is inputted into the control section 22 (MPU) in advance. Standard value R
The light emitting/receiving tube 12 is stopped at a position equal to , and the value ρ1 on the scale 20 at that time is read. The transmitted and received light ff112 is returned to its initial position.
次いで所定の位置まで移動したレンズ１０の位置Ｌ２に
おけるレンズ１０からの反射光を検出する。この場合も
投受光筒１２を移動させ、レンズｌＯからの反射光を受
光センサ１８によって連続的に検出し、受光センサ１８
からの出力信号レベルが上記の基準値Ｒに等しい位置で
投受光筒１２を停止させ、そのときのスケール２０上の
値１２を読み取る。Next, the reflected light from the lens 10 at the position L2 of the lens 10 that has been moved to a predetermined position is detected. In this case as well, the light emitting/receiving tube 12 is moved and the light reflected from the lens IO is continuously detected by the light receiving sensor 18.
The light emitting/receiving tube 12 is stopped at a position where the output signal level is equal to the above reference value R, and the value 12 on the scale 20 at that time is read.
レンズ１０の移動量Ｌ２−ＬＬ ＝ΔＬ＝１２−１１で
あるから、これを制御部２２で演算する。Since the amount of movement L2-LL of the lens 10 =ΔL=12-11, this is calculated by the control unit 22.
このレンズ１０の移動量が、実際の被写体との距離によ
る理論移動量であるかどうか判別することによって、測
距装置の精確さ、あるいはレンズ駆動装置の精確さ等を
判定できる。By determining whether the amount of movement of the lens 10 is the theoretical amount of movement based on the actual distance to the subject, the accuracy of the distance measuring device or the accuracy of the lens driving device can be determined.
（実施例）
以下には本発明の好適な実施例を添付図面に基づいて詳
細に説明する。(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings.
第１図は本発明装置の概要を示す説明図である。FIG. 1 is an explanatory diagram showing an outline of the apparatus of the present invention.
図において１０は被検物たるレンズ（フォーカスレンズ
）である。レンズ１０の前方光軸上には投受光筒１２が
光軸方向に移動自在に配置される。In the figure, 10 is a lens (focus lens) which is an object to be inspected. A light emitting/receiving tube 12 is arranged on the front optical axis of the lens 10 so as to be movable in the optical axis direction.
投受光筒１２後方にはフレキシブルなライトガイド１４
を介して投光ランプ１６および受光センサ１８が接続さ
れている。A flexible light guide 14 is located behind the light emitting and receiving tube 12.
A light projecting lamp 16 and a light receiving sensor 18 are connected via the light emitting lamp 16 and the light receiving sensor 18.
１なお投受光筒１２は適宜なガイド部材（図示せず）に
よってレンズ光軸上を案内されるようになっており、駆
動部たるパルスモータ（図示せず）、リニアモータ、ソ
レノイド等の駆動モータによって駆動される。1. The light emitting/receiving tube 12 is guided along the optical axis of the lens by an appropriate guide member (not shown), and is driven by a drive motor such as a pulse motor (not shown), a linear motor, or a solenoid. driven by.
投受光ｗ１１２、ライトガイド１４、投光ランプ１６、
受光センサ１８等によって投受光部を構成する。Light emitting/receiving w112, light guide 14, light emitting lamp 16,
The light receiving sensor 18 and the like constitute a light projecting and receiving section.
２０はスケールであり、投受光筒１２の移動方向に沿っ
て設けられている。スケール２０は電気マイクロマグネ
スケールあるいはポテンショメータ等によって形成され
、投受光筒１２の移動位置を検出する。Reference numeral 20 denotes a scale, which is provided along the moving direction of the light emitting/receiving tube 12. The scale 20 is formed by an electric micromagnetic scale or a potentiometer, and detects the moving position of the light emitting/receiving tube 12.
２２は受光センサ１８に接続された制御部たるＭＰＵで
、投受光筒１２を移動させ被検物たるレンズ１０の基準
位置での受光量と、レンズ１０が移動した位置での受光
量とを比較するコンパレータを具備し、両受光量が等し
い位置でスケール２０の値を読み取る機能を有する。Reference numeral 22 denotes an MPU that is a control unit connected to the light receiving sensor 18, which moves the light emitting/receiving tube 12 and compares the amount of light received at the reference position of the lens 10, which is the object to be inspected, with the amount of light received at the position to which the lens 10 has been moved. It has a function of reading the value of the scale 20 at a position where both amounts of received light are equal.
本発明に係るレンズ変位量検出装置は以上のように構成
されている。The lens displacement detection device according to the present invention is configured as described above.
続いてその動作について説明する。Next, its operation will be explained.
まずレンズ１０の基準位置（例えば無限距離位置）にお
ける受光センサ１８による受光量が所定の値に成った時
のスケールの値が読み取られＭＰＵ２２のメモリーに記
憶される。First, the value on the scale when the amount of light received by the light receiving sensor 18 at the reference position (eg, infinite distance position) of the lens 10 reaches a predetermined value is read and stored in the memory of the MPU 22.
すなわち、駆動部によって投受光筒１２を移動させ、レ
ンズ１０からの反射光を受光センサ１８によって連続的
に検出し、受光センサ１８からの出力信号レベルがあら
かじめ制御部２２（ＭＰＵ）に入力されている基準値Ｒ
に等しい位置で投受光筒１２を停止させ、そのときのス
ケール２０上の値１１を読み取る。投受光筒１２は初期
の位置まで戻される。That is, the light emitting/receiving tube 12 is moved by the driving section, the reflected light from the lens 10 is continuously detected by the light receiving sensor 18, and the output signal level from the light receiving sensor 18 is inputted into the control section 22 (MPU) in advance. Standard value R
The light emitting/receiving tube 12 is stopped at a position equal to , and the value 11 on the scale 20 at that time is read. The light emitting and receiving tube 12 is returned to its initial position.
このカメラ側の適宜な測距装置による測距データに基づ
いてレンズ１０が△したけ繰り出されたとする（そのと
きのレンズ１０位置をＬ２とする）。Assume that the lens 10 is extended by an amount Δ based on distance measurement data obtained by an appropriate distance measurement device on the camera side (the position of the lens 10 at that time is assumed to be L2).
次いで所定の位置まで移動したレンズ１０の位ｉＬ２に
おけるレンズ１０からの反射光を検出する。この場合も
投受光筒１２を移動させ、レンズ狂Ｏからの反射光を受
光センサ１８によって連続的に検出し、受光センサ１８
からの出力信号レベルが上記の基準値Ｒに等しい位置で
投受光筒１２を停止させ、そのときのスケール２０上の
値１２を読み取る。Next, the reflected light from the lens 10 at the position iL2 of the lens 10 moved to a predetermined position is detected. In this case as well, the light emitting/receiving tube 12 is moved, and the light receiving sensor 18 continuously detects the reflected light from the lens deviation O.
The light emitting/receiving tube 12 is stopped at a position where the output signal level is equal to the above reference value R, and the value 12 on the scale 20 at that time is read.
△Ｌ＝Ｌ２−Ｌｌ １２−ｔ！１
であるから、スケール２０上での１２−１１を読み取る
ことによってレンズ１０の実際の繰り出し量が測定され
る。△L=L2-Ll 12-t! 1, the actual amount of extension of the lens 10 is measured by reading 12-11 on the scale 20.
したがってこの測定データと、あらかじめ距離のわかっ
ている被写体に対する上記の実際のレンズの理論繰り出
し量とを比較することによって、フォーカスレンズの駆
動装置（あるいは測距装置）が精確か否か判別できるこ
とになる。Therefore, by comparing this measurement data with the above-mentioned theoretical amount of actual lens extension for a subject whose distance is known in advance, it is possible to determine whether the focus lens drive device (or distance measurement device) is accurate or not. .
なお、投受光筒１２とスケール２０との２位置間の距離
差を検出するので、装置の機械的がたつき等は相殺され
、精確な距離が検出できる。２２−７！■は電気的手段
によって検出することによって測定誤差を少なくできる
。Note that since the distance difference between the two positions of the light emitting/receiving tube 12 and the scale 20 is detected, mechanical rattling of the device, etc. is canceled out, and an accurate distance can be detected. 22-7! (2) Measurement errors can be reduced by detecting by electrical means.
なお、投光ランプ１６からは、自然光の乱反射の影響を
除くため、自然光以外の、例えば赤外線を発光する赤外
線ランプを用いるのが好ましく、またこれに応じて受光
センサ１８は赤外線受光センサを用いるのがよい。Note that in order to remove the influence of diffused reflection of natural light, it is preferable to use an infrared lamp that emits other than natural light, for example, infrared light, from the floodlight lamp 16, and accordingly, the light receiving sensor 18 may be an infrared light receiving sensor. Good.
（発明の効果）
以上のように本発明に係るレンズ変位量検出装置によれ
ば、レンズに非接触で測定が可能であるから、レンズを
傷付けるおそれがなく、また測定も容易かつ精確に行え
る。(Effects of the Invention) As described above, according to the lens displacement detection device according to the present invention, measurement can be performed without contacting the lens, so there is no risk of damaging the lens, and measurement can be performed easily and accurately.
さらには投受光筒の位置差をスケールを介して検出する
ものであるため、バックラッシュ等装置の機械的がたつ
き等をクリアすることができ、優れた測定精度が得られ
るという著効を奏する。Furthermore, since the positional difference between the emitter and receiver tubes is detected via a scale, it is possible to eliminate backlash and other mechanical wobbling of the device, resulting in excellent measurement accuracy. .
以上本発明につき好適な実施例を挙げて種々説明したが
、本発明はこの実施例に限定されるものではなく、発明
の精神を逸税しない範囲内で多くの改変を施し得るのは
もちろんのことである。Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made within the scope of not departing from the spirit of the invention. That's true.
第１図は本発明装置の概略を示す説明図、第２図は、レ
ンズのＬ１位置、およびＬ２位置において投受光筒を移
動させた際の受光センサにおける受光量変化を示すグラ
フである。
１０・・・レンズ、 １２・・・投受光筒、１４・・・
ライトガイド、 １６・・・投光ランプ、 １８・・
・受光センサ、 ２０・・・スケール、 ２２・・・Ｍ
ＰＵ。
第１図
第２図
（スキャン）FIG. 1 is an explanatory diagram showing the outline of the apparatus of the present invention, and FIG. 2 is a graph showing changes in the amount of light received by the light receiving sensor when the light emitting and receiving tube is moved at the L1 position and the L2 position of the lens. 10... Lens, 12... Light emitting/receiving tube, 14...
Light guide, 16... Flood lamp, 18...
・Light receiving sensor, 20...Scale, 22...M
P.U. Figure 1 Figure 2 (scan)
Claims (1)
れ、フォーカスレンズ面に向けて光を照射する投光ラン
プを具備すると共に、該投光ランプから照射され、フォ
ーカスレンズ面で反射された反射光を検出する受光セン
サを具備する投受光部と、 該投受光部をフォーカスレンズ前方の光軸 上を移動させる駆動部と、 前記投受光部の移動経路と平行に配置され、投受光部の
位置を検出するスケールと、 フォーカスレンズの基準位置において、前 期駆動部によって光軸上を投受光部が移動される際、投
受光部によって検出されるフォーカスレンズからの反射
光量が基準量になった位置での投受光部のスケール上の
位置と、フォーカスレンズが所定量移動された位置で、
同じく前記駆動部によって光軸上を投受光部が移動され
る際、投受光部によって検出されるフォーカスレンズか
らの反射光量が上記基準量になった位置での投受光部の
スケール上の位置とを読み取り、スケール上の上記両位
置差をフォーカスレンズの移動量として算出する制御部
とを備えてなるレンズ変位量検出装置。[Claims] 1. A floodlight lamp is disposed on the front optical axis of the focus lens, which is the object to be inspected, and emits light toward the focus lens surface. a light emitting/receiving section including a light receiving sensor that detects reflected light reflected by a lens surface; a driving section for moving the light emitting/receiving section on an optical axis in front of the focus lens; A scale is arranged to detect the position of the light emitting/receiving section, and a scale detecting the reflection from the focus lens detected by the light emitting/receiving section when the light emitting/receiving section is moved on the optical axis by the first drive section at the reference position of the focus lens. The position of the light emitter/receiver on the scale at the position where the light intensity reaches the reference level and the position where the focus lens is moved by a predetermined amount,
Similarly, when the light emitting/receiving section is moved on the optical axis by the driving section, the position of the light emitting/receiving section on the scale at a position where the amount of reflected light from the focus lens detected by the light emitting/receiving section reaches the above reference amount. A lens displacement amount detection device comprising: a control section that reads the above-mentioned positional difference between the two positions on a scale and calculates the movement amount of the focus lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31144386A JPS63167315A (en) | 1986-12-29 | 1986-12-29 | Device for detecting displacement amount of lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31144386A JPS63167315A (en) | 1986-12-29 | 1986-12-29 | Device for detecting displacement amount of lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63167315A true JPS63167315A (en) | 1988-07-11 |
Family
ID=18017275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31144386A Pending JPS63167315A (en) | 1986-12-29 | 1986-12-29 | Device for detecting displacement amount of lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63167315A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4968746A (en) * | 1972-10-31 | 1974-07-03 | ||
| JPS5689005A (en) * | 1979-12-20 | 1981-07-20 | Yokogawa Hokushin Electric Corp | Position detector |
| JPS59171812A (en) * | 1983-02-15 | 1984-09-28 | ゼネラル・エレクトリツク・カンパニイ | Optical inspection device and method |
-
1986
- 1986-12-29 JP JP31144386A patent/JPS63167315A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4968746A (en) * | 1972-10-31 | 1974-07-03 | ||
| JPS5689005A (en) * | 1979-12-20 | 1981-07-20 | Yokogawa Hokushin Electric Corp | Position detector |
| JPS59171812A (en) * | 1983-02-15 | 1984-09-28 | ゼネラル・エレクトリツク・カンパニイ | Optical inspection device and method |
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