JPH10221064A - Optical distance-measuring device - Google Patents
Optical distance-measuring deviceInfo
- Publication number
- JPH10221064A JPH10221064A JP2532997A JP2532997A JPH10221064A JP H10221064 A JPH10221064 A JP H10221064A JP 2532997 A JP2532997 A JP 2532997A JP 2532997 A JP2532997 A JP 2532997A JP H10221064 A JPH10221064 A JP H10221064A
- Authority
- JP
- Japan
- Prior art keywords
- light
- lens
- light receiving
- hologram
- hologram 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.)
- Withdrawn
Links
Landscapes
- Length Measuring Devices By Optical Means (AREA)
- Measurement Of Optical Distance (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、車両、船舶、航空
機やカメラ等の各種の産業機器に採用するに適した光学
式測距装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical distance measuring apparatus suitable for use in various industrial equipment such as vehicles, ships, aircraft, cameras and the like.
【０００２】[0002]
【従来の技術】従来、測定対象物までの距離を測定する
装置としては、図５にて示すような三角測距装置があ
る。この三角測距装置は、投光系Ｉと、受光系Ｒと、電
気回路Ｅとにより構成されている。2. Description of the Related Art Conventionally, as a device for measuring a distance to an object to be measured, there is a triangulation device as shown in FIG. The triangulation device includes a light projecting system I, a light receiving system R, and an electric circuit E.
【０００３】投光系Ｉは、発光ダイオードからなる発光
素子１０と、この発光素子１０の前側に配置した投光レ
ンズ２０とを備えており、発光素子１０は、投光レンズ
２０に向けて発光する。投光レンズ２０は、発光素子１
０からの光を集光しビーム光として被測定対象物Ｍに向
けて投光する。なお、発光素子１０及び投光レンズ２０
の各光軸（以下、投光系Ｉの光軸Ｉ１という）は同一直
線上にある。また、投光レンズ２０は凸レンズからな
る。また、投光レンズ２０は、ケーシング１１の開口部
に嵌着されており、発光素子１０は、ケーシング１１内
にてその底壁に位置している。The light projecting system I includes a light emitting element 10 composed of a light emitting diode and a light projecting lens 20 disposed in front of the light emitting element 10. The light emitting element 10 emits light toward the light projecting lens 20. I do. The light projecting lens 20 includes the light emitting element 1
Light from 0 is condensed and projected as a beam light toward the object M to be measured. The light emitting element 10 and the light projecting lens 20
(Hereinafter referred to as the optical axis I1 of the light projecting system I) are on the same straight line. The light projecting lens 20 is formed of a convex lens. The light projecting lens 20 is fitted in an opening of the casing 11, and the light emitting element 10 is located on the bottom wall in the casing 11.
【０００４】受光系Ｒは、受光レンズ３０と、この受光
レンズ３０の後側に配置した位置センサ４０とを備えて
いる。受光レンズ３０は、凸レンズからなるもので、こ
の受光レンズ３０は、測定対象物により反射される投光
レンズ２０からのビーム光を位置センサ４０の一次元状
受光部上に結像させる。位置センサ４０は、半導体位置
センサ（以下、ＰＳＤという）からなるもので、このＰ
ＳＤ４０は、その一次元状受光部にて受光レンズ３０の
光軸に直交するように配置されている。なお、ＰＳＤ４
０の受光部中央位置４１（受光部の図５にて図示左右方
向中央位置）が、受光レンズ３０の光軸（以下、受光系
Ｒの光軸Ｒ１という）上にある。The light receiving system R includes a light receiving lens 30 and a position sensor 40 disposed behind the light receiving lens 30. The light receiving lens 30 is formed of a convex lens. The light receiving lens 30 forms an image of the light beam from the light projecting lens 20 reflected by the measurement object on the one-dimensional light receiving portion of the position sensor 40. The position sensor 40 includes a semiconductor position sensor (hereinafter, referred to as PSD).
The SD 40 is disposed so as to be orthogonal to the optical axis of the light receiving lens 30 at the one-dimensional light receiving portion. Note that PSD4
The center position 41 of the light-receiving portion 0 (the center position of the light-receiving portion in the horizontal direction in FIG. 5) is on the optical axis of the light-receiving lens 30 (hereinafter, referred to as the optical axis R1 of the light-receiving system R).
【０００５】しかして、受光レンズ３０からの光がＰＳ
Ｄ４０の受光部上に結像する位置（以下、結像位置４２
という）及びこの結像位置４２の受光部中央位置４１か
らの位置に応じた検出電流がＰＳＤ４０から電気回路Ｅ
に出力される。なお、受光レンズ３０は、ケーシング３
１の開口部に嵌着されており、ＰＳＤ４０は、ケーシン
グ３１内にてその底壁に位置している。[0005] When the light from the light receiving lens 30 is PS
A position where an image is formed on the light receiving unit of D40 (hereinafter, an image forming position 42)
And the detected current corresponding to the position of the image forming position 42 from the light receiving unit center position 41 is output from the PSD 40 to the electric circuit E
Is output to Note that the light receiving lens 30 is
1, the PSD 40 is located on the bottom wall in the casing 31.
【０００６】電気回路Ｅは、発光駆動回路５０及び距離
算出回路６０を備えており、発光駆動回路５０は、発光
素子１０を発光駆動する。距離算出回路６０は、ＰＳＤ
４０の検出電流に基づき、三角測距法にて投光レンズ２
０と被測定対象物Ｍとの間の距離を算出する。なお、上
記三角測距法では、投光レンズ２０の中心点、被測定対
象物Ｍへの投光レンズ２０からのビーム光の入射点及び
受光レンズ３０の中心点を結ぶ三角形と、受光レンズ３
０の中心点、ＰＳＤ４０の受光部中央位置４１及び結像
位置４２を結ぶ三角形とが互いに相似になることを利用
して、投光レンズ２０と被測定対象物Ｍとの間の距離を
算出するものである。The electric circuit E includes a light emission drive circuit 50 and a distance calculation circuit 60. The light emission drive circuit 50 drives the light emitting element 10 to emit light. The distance calculation circuit 60 uses the PSD
Based on the detected current of 40, the projection lens 2 is formed by triangulation.
The distance between 0 and the object to be measured M is calculated. In the triangulation method, a triangle connecting the center point of the light projecting lens 20, the point of incidence of the light beam from the light projecting lens 20 to the object M to be measured, and the center point of the light receiving lens 30, and the light receiving lens 3
The distance between the light projecting lens 20 and the object to be measured M is calculated by making use of the fact that the center point of 0 and the triangle connecting the light receiving unit center position 41 and the image forming position 42 of the PSD 40 are similar to each other. Things.
【０００７】[0007]
【発明が解決しようとする課題】ところで、上記三角測
距装置に対しては小型化が要請されている。この小型化
には、投光レンズ２０の光軸と受光レンズ３０の光軸と
の間隔、即ち、基線長Ｓ（図５参照）を短くする必要が
ある。しかし、基線長Ｓを短くすると、ＰＳＤ４０の受
光部上における結像位置４２の受光部中央位置４１から
の移動量が極端に小さくなって、ＰＳＤ４０の分解能が
低下する。このため、ＰＳＤ４０の検出精度が低下す
る。このようなことは、被測定対象物Ｍと投光レンズ２
０との距離が長い程著しい。By the way, there is a demand for downsizing of the triangulation device. To reduce the size, it is necessary to reduce the distance between the optical axis of the light projecting lens 20 and the optical axis of the light receiving lens 30, that is, the base length S (see FIG. 5). However, when the base line length S is reduced, the amount of movement of the imaging position 42 on the light receiving unit of the PSD 40 from the light receiving unit center position 41 becomes extremely small, and the resolution of the PSD 40 decreases. For this reason, the detection accuracy of the PSD 40 decreases. This is because the object to be measured M and the projection lens 2
This is remarkable as the distance from 0 is longer.
【０００８】また、三角測距装置に対しては、その測定
距離範囲を広くすることが要請されている。しかし、例
えば１ｍ付近の測距精度が良好になるように設定された
三角測距装置では、測定距離が非常に短くなると、受光
レンズ３０を通る被測定対象物Ｍの反射光がＰＳＤ４０
の受光部上に結像しにくい。従って、至近距離の測距は
困難といえる。[0008] Further, there is a demand for a triangular distance measuring device to widen its measuring distance range. However, for example, in a triangular distance measuring apparatus set so that the distance measuring accuracy in the vicinity of 1 m becomes good, when the measuring distance becomes very short, the reflected light of the object M to be measured passing through the light receiving lens 30 becomes the PSD 40.
It is difficult to form an image on the light receiving section of Therefore, it can be said that distance measurement at a close distance is difficult.
【０００９】そこで、本発明は、以上のようなことに対
処するため、ホログラムレンズに角度依存性及び出射角
度増幅性をもたせ得るという特性を有効に活用して、小
型化及び広範囲に亘る高精度の測距を可能とする光学式
測距装置を提供することを目的とする。In order to cope with the above problems, the present invention makes effective use of the characteristic that the hologram lens can have an angle dependency and an output angle amplifying property. It is an object of the present invention to provide an optical distance measuring device capable of measuring distance.
【００１０】[0010]
【課題を解決するための手段】上記目的を達成するた
め、請求項１に記載の発明によれば、受光系の受光レン
ズが透過型ホログラムレンズであって、このホログラム
レンズは、当該ホログラムレンズからの光の出射角度が
当該ホログラムレンズへの光の入射角度よりも大きくな
るように形成されている。また、位置センサがその受光
部にホログラムレンズからの光を入射させるように配置
されている。To achieve the above object, according to the first aspect of the present invention, the light receiving lens of the light receiving system is a transmission type hologram lens, and the hologram lens is formed from the hologram lens. Is formed so that the light emission angle is larger than the light incidence angle on the hologram lens. Further, the position sensor is arranged so that light from the hologram lens is incident on the light receiving section.
【００１１】これにより、位置センサの受光部がホログ
ラムレンズの光軸にほぼ並行となるように位置した状態
にて、ホログラムレンズからの光が位置センサの受光部
に入射することとなる。この場合、ホログラムレンズの
光の出射角はその入射角よりも大きくなるように当該ホ
ログラムレンズが形成されている。従って、被測定対象
物との距離が短くても長くても、ホログラムレンズの出
射光は確実に位置センサの受光部に入射できるのは勿論
のこと、位置センサの受光部上における入射光の移動量
も適正に確保できる。その結果、受光系と投光系との間
の基線長を短縮して小型化を確保し、かつ、位置センサ
の分解能を適正に維持しつつ広い距離範囲に亘る高精度
の測距が可能となる。Thus, the light from the hologram lens enters the light receiving section of the position sensor in a state where the light receiving section of the position sensor is positioned so as to be substantially parallel to the optical axis of the hologram lens. In this case, the hologram lens is formed such that the light emission angle of the hologram lens is larger than the incident angle. Therefore, regardless of whether the distance to the object to be measured is short or long, the light emitted from the hologram lens can be surely incident on the light receiving portion of the position sensor, and the movement of the incident light on the light receiving portion of the position sensor can be ensured. The amount can be secured appropriately. As a result, it is possible to shorten the base line length between the light receiving system and the light projecting system, secure miniaturization, and perform high-precision ranging over a wide distance range while properly maintaining the resolution of the position sensor. Become.
【００１２】[0012]
【発明の実施の形態】以下、本発明の一実施形態を図面
に基づいて説明する。図１は、本発明に係る測距装置の
概略を示している。この測距装置は、図５の三角測距装
置において、受光レンズ３０に代えて透過型ホログラム
レンズ７０を採用するとともに、ＰＳＤ４０を、ケーシ
ング３１内にてその図１にて図示左壁（投光系Ｉと受光
系Ｒとの間にて両光軸Ｉ１、Ｒ１に平行となっている）
に固定した構成となっている。なお、ホログラムレンズ
７０は、ケーシング３１の開口部に嵌着されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows a distance measuring apparatus according to the present invention. This distance measuring device employs a transmission type hologram lens 70 instead of the light receiving lens 30 in the triangular distance measuring device of FIG. (Between the system I and the light receiving system R, it is parallel to both optical axes I1, R1.)
The configuration is fixed to. Note that the hologram lens 70 is fitted in the opening of the casing 31.
【００１３】ここで、ホログラムレンズ７０の製法につ
いて説明する。このホログラムレンズ７０は、図２にて
示すホログラム撮影光学系８０を利用して製作されてい
る。この製作にあたり、ホログラムレンズ７０の原板で
あるホログラム乾板７０Ａを準備する。そして、このホ
ログラム乾板７０Ａをホログラム撮影光学系８０内に図
２にて示す位置に配置する。Here, a method of manufacturing the hologram lens 70 will be described. The hologram lens 70 is manufactured using a hologram photographing optical system 80 shown in FIG. In this production, a hologram dry plate 70A as an original plate of the hologram lens 70 is prepared. Then, the hologram dry plate 70A is arranged in the hologram photographing optical system 80 at the position shown in FIG.
【００１４】このような状態にて、ホログラム撮影光学
系８０のレーザ光源８１が、波長λのレーザ光を出射す
ると、このレーザ光の一部が、ハーフミラー８２により
反射されて拡散レンズ８３に入射する。すると、この拡
散レンズ８３が、その入射光を拡散してホログラム乾板
７０Ａにその裏面側から入射する。一方、レーザ光の残
部が、ハーフミラー８２を透過して反射ミラー８４に入
射する。この反射ミラー８４による反射光が拡散レンズ
８５に入射すると、この拡散レンズ８５がその入射光を
拡散して反射ミラー８６に入射させる。この反射ミラー
８６が、その入射光を、凸レンズ８７に入射すると、こ
の凸レンズ８７は、その入射光を平行光に変換してホロ
グラム乾板７０Ａにその表面側から入射する。In this state, when the laser light source 81 of the hologram photographing optical system 80 emits a laser beam having a wavelength λ, a part of the laser beam is reflected by the half mirror 82 and enters the diffusion lens 83. I do. Then, the diffusion lens 83 diffuses the incident light and enters the hologram dry plate 70A from the back side. On the other hand, the remaining portion of the laser beam passes through the half mirror 82 and enters the reflection mirror 84. When the light reflected by the reflection mirror 84 enters the diffusion lens 85, the diffusion lens 85 diffuses the incident light and causes the light to enter the reflection mirror 86. When this reflection mirror 86 makes the incident light incident on the convex lens 87, the convex lens 87 converts the incident light into parallel light and makes it incident on the hologram dry plate 70A from the surface side.
【００１５】ここで、ホログラム乾板７０Ａの光軸をＰ
とする。また、凸レンズ８７からの光のホログラムレン
ズ７０への入射方向と光軸Ｐとのなす角度をθ1 とす
る。さらに、ホログラム乾板７０Ａの光軸Ｐ上の位置
（ホログラムレンズ７０の受光部中央位置４１に相当す
る）への拡散レンズ８３からの光の入射方向と光軸Ｐと
のなす角度をθ2 とする。また、角度θ2 を角度θ1 よ
りも大きくし、レーザ光の波長λを、ホログラム撮影波
長（例えば、６３３ｎｍ）とする。Here, the optical axis of the hologram dry plate 70A is P
And The angle between the direction of incidence of light from the convex lens 87 on the hologram lens 70 and the optical axis P is θ 1 . Further, the angle between the optical axis P and the incident direction of the light from the diffusion lens 83 to the position on the optical axis P of the hologram dry plate 70A (corresponding to the central position 41 of the light receiving portion of the hologram lens 70) is defined as θ 2 . . Further, the angle theta 2 larger than the angle theta 1, the wavelength of the laser beam lambda, the hologram photographing wavelength (e.g., 633 nm).
【００１６】このような条件のもと、ホログラム乾板７
０Ａの表面及び裏面に上述のごとく光を入射すれば、こ
のホログラム乾板７０Ａが上記ホログラムレンズ７０と
して形成される。これにより、ホログラム撮影波長λ及
び両角度θ1 、θ2 に基づく干渉縞ホログラムデータが
記録される。このように形成したホログラムレンズ７０
では、その表面側へ入射する光の中心波長をλｏとすれ
ば、次の数１の式により表される関係が成立する。Under these conditions, the hologram dry plate 7
When light is incident on the front surface and the back surface of 0A as described above, the hologram dry plate 70A is formed as the hologram lens 70. Thereby, interference fringe hologram data based on the hologram imaging wavelength λ and both angles θ 1 and θ 2 are recorded. The hologram lens 70 thus formed
Assuming that the central wavelength of light incident on the surface side is λo, the relationship expressed by the following equation 1 holds.
【００１７】[0017]
【数１】 λｏ／ｓｉｎ（θ1 ／２）＝λ／ｓｉｎ（θ2 ／２） この式によれば、λｏ＝４７０ｎｍとすれば、（λ／λ
ｏ）＝（６３３／４７０）に比例して、θ1 がθ2 に略
角度増幅されることが分かる。その他の構成につき、図
５の三角測距装置にて示す構成素子と同一の構成素子に
関しては図５と同一符号を付してその説明は省略する。[Number 1] λo / sin (θ 1/2 ) = λ / sin (θ 2/2) According to this equation, if λo = 470nm, (λ / λ
o) It can be seen that θ 1 is substantially angularly amplified to θ 2 in proportion to (633/470). Regarding the other components, the same components as those shown in the triangular distance measuring apparatus in FIG. 5 are denoted by the same reference numerals as those in FIG. 5 and the description thereof is omitted.
【００１８】このように構成した本実施形態において、
図１にて示すごとく、被測定対象物Ｍの反射光がホログ
ラムレンズ７０の表面に入射すれば、この入射光はＰＳ
Ｄ４０の受光部に向けて屈折されて入射する。ここで、
発光素子１０の発光中心波長をλｏ＝４７０ｎｍとし、
ホログラムレンズ７０への入射光方向と光軸Ｒ１（光軸
Ｐに相当）とのなす角度を上記角度θ 1 とすれば、ホロ
グラムレンズ７０の出射光方向は、数１の式でλｏ＝４
７０ｎｍを前提に、上記干渉縞ホログラムデータに基づ
き、光軸Ｒ１に対し上記角度θ 2 の方向となる。In this embodiment configured as described above,
As shown in FIG. 1, the reflected light of the object to be measured M is a hologram.
If the light enters the surface of the ram lens 70, this incident light is PS
The light is refracted and incident on the light receiving unit of D40. here,
The light emission center wavelength of the light emitting element 10 is λo = 470 nm,
The direction of light incident on the hologram lens 70 and the optical axis R1 (optical axis
P)) is the angle θ 1If so, Jolo
The outgoing light direction of the Gram lens 70 is λo = 4 in the equation (1).
Based on the above interference fringe hologram data,
The angle θ with respect to the optical axis R1. TwoDirection.
【００１９】この場合、角度θ2 は数１の式に基づき角
度θ1 から角度増幅されるから、基線長Ｓが短くても、
広い測距範囲に亘り、ホログラムレンズ７０の出射光が
ＰＳＤ４０の受光部に入射し易くなるのは勿論のこと、
ＰＳＤ４０の受光部上における入射結像光の移動量を大
きくできる。このことは、ＰＳＤ４０の分解能を、広い
測距範囲に亘り高く維持できることを意味する。In this case, since the angle θ 2 is amplified from the angle θ 1 based on the equation 1, even if the base line length S is short,
It goes without saying that the light emitted from the hologram lens 70 easily enters the light receiving unit of the PSD 40 over a wide ranging range.
The amount of movement of incident imaging light on the light receiving section of the PSD 40 can be increased. This means that the resolution of the PSD 40 can be maintained high over a wide ranging range.
【００２０】その結果、基線長Ｓを短くすることで測距
装置の小型化を確保しつつ、被測定対象物Ｍとの距離
を、至近距離から遠方まで含む広い測距範囲に亘り高精
度にて測距可能をし得る。次に、上記実施形態の変形例
を図３に基づいて説明する。この変形例では、受光系Ｒ
のケーシング３１内にて、屈折率可変素子９０が、ホロ
グラムレンズ７０及びＰＳＤ４０の双方に対向するよう
に配置されている。その他の構成は上記実施形態と同様
である。As a result, by shortening the base line length S, the distance measuring device can be miniaturized, and the distance from the object to be measured M can be accurately measured over a wide ranging range including a very short distance to a long distance. Distance can be measured. Next, a modification of the above embodiment will be described with reference to FIG. In this modification, the light receiving system R
In the casing 31, a variable refractive index element 90 is disposed so as to face both the hologram lens 70 and the PSD 40. Other configurations are the same as those of the above embodiment.
【００２１】このように構成した本変形例では、測距装
置と被測定対象物Ｍとの距離が通常の場合には、ホログ
ラムレンズ７０を透過する光は、図４（ａ）にて示すよ
うに、屈折率可変素子９０により屈折されてＰＳＤ４０
に入射する。このとき、屈折率可変素子９０の屈折率は
ｎ＝ｎ１＝１に小さく維持されている。測距装置と被測
定対象物Ｍとの距離が非常に短くなって、ホログラムレ
ンズ７０を透過する光が、図４（ｂ）にて示すように、
ＰＳＤ４０の端部に達したとき、屈折率可変素子９０の
屈折率ｎをｎ２（＞１）に増大する。すると、ホログラ
ムレンズ７０を透過する光は、図４（ｃ）にて示すよう
に、屈折率可変素子９０により逆方向に屈折されてＰＳ
Ｄ４０に入射する。In this modified example, when the distance between the distance measuring device and the object to be measured M is normal, the light transmitted through the hologram lens 70 is as shown in FIG. The PSD 40 is refracted by the refractive index variable element 90 and
Incident on. At this time, the refractive index of the variable refractive index element 90 is kept small at n = n1 = 1. Since the distance between the distance measuring device and the object to be measured M is very short, light transmitted through the hologram lens 70 is, as shown in FIG.
When reaching the end of the PSD 40, the refractive index n of the variable refractive index element 90 is increased to n2 (> 1). Then, the light transmitted through the hologram lens 70 is refracted in the opposite direction by the variable refractive index element 90 as shown in FIG.
It is incident on D40.
【００２２】これにより、測距装置と被測定対象物Ｍと
の距離が非常に短くても、測距が可能となる。なお、本
発明の実施にあたっては、ＰＳＤセンサ４０に代えて、
ＣＣＤセンサを採用して実施してもよい。Thus, even if the distance between the distance measuring device and the object to be measured M is very short, the distance can be measured. In implementing the present invention, instead of the PSD sensor 40,
It may be implemented by adopting a CCD sensor.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明の一実施形態を示す概略構成図である。FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention.
【図２】図１のホログラムレンズを作製するためのホロ
グラム撮影光学系を示す図である。FIG. 2 is a diagram showing a hologram photographing optical system for producing the hologram lens of FIG.
【図３】上記実施形態の変形例を示す要部構成図であ
る。FIG. 3 is a main part configuration diagram showing a modification of the embodiment.
【図４】（ａ）乃至（ｃ）は、測距装置と測定対象物と
の距離の短縮に伴う屈折率可変素子の屈折率の増大に応
じてホログラムレンズから受光素子に入射する光の屈折
状況の変化を示す図である。FIGS. 4A to 4C show refraction of light incident on the light receiving element from the hologram lens in accordance with an increase in the refractive index of the variable refractive index element as the distance between the distance measuring device and the object to be measured is reduced. It is a figure showing a change of a situation.
【図５】従来の測距装置の概略構成図である。FIG. 5 is a schematic configuration diagram of a conventional distance measuring device.
Ｉ…投光系、Ｒ…受光系、４０…ＰＳＤ、７０…ホログ
ラムレンズ、６０…距離算出回路。I: light projecting system, R: light receiving system, 40: PSD, 70: hologram lens, 60: distance calculation circuit.
Claims (1)
光を受けて集光する受光レンズと、この受光レンズの集
光光を一次元状受光部にて受光しその受光位置に基づき
検出信号を発生する位置センサ（４０）とを備え、前記
投光系に隣接して配置された受光系（Ｒ）と、 前記位置センサの検出信号に応じて前記被測定対象物と
の間の距離を算出する距離算出手段（６０）とを設けた
光学式測距装置において、 前記受光レンズが、透過型ホログラムレンズ（７０）で
あって、 このホログラムレンズからの光の出射角度が当該ホログ
ラムレンズへの光の入射角度よりも大きくなるように前
記ホログラムレンズが形成されており、 前記位置センサがその受光部に前記ホログラムレンズか
らの光を入射させるように配置されていることを特徴と
する光学式測距装置。1. A light projecting system (I), a light receiving lens for receiving and condensing light from the light projecting system reflected by an object to be measured (M), A position sensor (40) that receives light at the original light receiving unit and generates a detection signal based on the light receiving position, a light receiving system (R) disposed adjacent to the light projecting system, and detection of the position sensor An optical distance measuring device provided with a distance calculating means (60) for calculating a distance from the object to be measured in accordance with a signal, wherein the light receiving lens is a transmission type hologram lens (70); The hologram lens is formed such that an emission angle of light from the hologram lens is larger than an incidence angle of light to the hologram lens, and the position sensor makes light from the hologram lens incident on a light receiving unit thereof. To let Optical distance measuring apparatus characterized by being location.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2532997A JPH10221064A (en) | 1997-02-07 | 1997-02-07 | Optical distance-measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2532997A JPH10221064A (en) | 1997-02-07 | 1997-02-07 | Optical distance-measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10221064A true JPH10221064A (en) | 1998-08-21 |
Family
ID=12162913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2532997A Withdrawn JPH10221064A (en) | 1997-02-07 | 1997-02-07 | Optical distance-measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10221064A (en) |
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| JP2007010556A (en) * | 2005-07-01 | 2007-01-18 | Sharp Corp | Optical range finding sensor, and equipment provided therewith |
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1997
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