JPH0511082U - Laser light transmission / reception optical system - Google Patents

Laser light transmission / reception optical system

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Publication number
JPH0511082U
JPH0511082U JP5809791U JP5809791U JPH0511082U JP H0511082 U JPH0511082 U JP H0511082U JP 5809791 U JP5809791 U JP 5809791U JP 5809791 U JP5809791 U JP 5809791U JP H0511082 U JPH0511082 U JP H0511082U
Authority
JP
Japan
Prior art keywords
optical system
target
transmission
light
transmitting
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
Application number
JP5809791U
Other languages
Japanese (ja)
Inventor
泰介 遠藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP5809791U priority Critical patent/JPH0511082U/en
Publication of JPH0511082U publication Critical patent/JPH0511082U/en
Pending legal-status Critical Current

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Abstract

(57)【要約】 【目的】 遠距離目標に対する受信特性を変化させず
に、近距離目標からの反射光を受光できるレーザ光送受
信光学系を提供することを目的とする。 【構成】 受信光学系の焦点位置に、光軸を中心とする
円形開口h1 と、円形開口h1 の送信光学系側と反対側
の縁から送信光学系側と反対方向にスリット状の開口h
2 を設けた遮光板4を配置しレーザ光送受信光学系を構
成する。
(57) [Abstract] [Purpose] An object is to provide a laser light transmission / reception optical system capable of receiving reflected light from a short-range target without changing the reception characteristics for the long-range target. [Structure] A circular opening h 1 centered on the optical axis at a focus position of a receiving optical system, and a slit-shaped opening from the edge of the circular opening h 1 opposite to the transmitting optical system side in a direction opposite to the transmitting optical system side. h
A light shielding plate 4 provided with 2 is arranged to constitute a laser light transmitting / receiving optical system.

Description

【考案の詳細な説明】[Detailed description of the device]

【0001】[0001]

【産業上の利用分野】[Industrial applications]

この考案は、レーザ測距装置において、受信視野を限定してレーザ光を受光す るためのレーザ光送受信光学系に関するものである。 The present invention relates to a laser beam transmitting / receiving optical system for receiving a laser beam with a limited field of view in a laser range finder.

【0002】[0002]

【従来の技術】[Prior Art]

従来、レーザ光送受信光学系には図4〜6に示すものがあった。図4はレーザ 送受信光学系の構成及び使用方法を示す図、図5はピンホールの開口形状を示す 図、図6は受信視野と送信ビームの覆域の関係を示す図である。図4において、 1はレーザ発振器、2は送信光学系、3は受信光学系、4はピンホールHを有す る遮光板、5は受光素子である。図5において、Hはピンホールの開口である。 図6において、6は受信視野、7は送信ビームの覆域であり、7aは目標が遠方 にあるときの覆域、7bは目標が中程度の距離にあるときの覆域、7cは目標が 近距離にあるときの覆域を示す。 Conventionally, there are laser light transmitting / receiving optical systems shown in FIGS. FIG. 4 is a diagram showing the configuration and usage of the laser transmission / reception optical system, FIG. 5 is a diagram showing the opening shape of the pinhole, and FIG. 6 is a diagram showing the relationship between the reception field of view and the coverage area of the transmission beam. In FIG. 4, 1 is a laser oscillator, 2 is a transmitting optical system, 3 is a receiving optical system, 4 is a light blocking plate having a pinhole H, and 5 is a light receiving element. In FIG. 5, H is the opening of the pinhole. In FIG. 6, reference numeral 6 is a reception field of view, 7 is a coverage area of the transmission beam, 7a is a coverage area when the target is at a distance, 7b is a coverage area when the target is at a medium distance, and 7c is a coverage area. Shows the coverage area at close range.

【0003】 次に動作について説明する。図4において、レーザ発振器1から出るレーザ光 は、送信光学系2に入り、送信ビーム広がり角を調整後、外部の目標に向けて送 信される。目標からの反射光は、受信光学系3で集光され、ピンホールHを通過 後、受光素子5にはいる。Next, the operation will be described. In FIG. 4, the laser light emitted from the laser oscillator 1 enters the transmission optical system 2 and, after adjusting the transmission beam divergence angle, is transmitted toward an external target. The reflected light from the target is condensed by the receiving optical system 3, passes through the pinhole H, and then enters the light receiving element 5.

【0004】 ピンホールHは図5に示すように、円形開口であり、開口径をd、受信光学系 の焦点距離をfとすると、受信視野角はd/fである。As shown in FIG. 5, the pinhole H is a circular aperture, and the reception viewing angle is d / f, where d is the aperture diameter and f is the focal length of the reception optical system.

【0005】 送信光学系2と、受信光学系3を平行に配置することにより、受信視野中心と 送信ビーム覆域の中心を一致させることができ、受信視野角を送信ビーム広がり 角と同程度にすることにより、送信したレーザ光の目標による反射光以外の外光 を除去することができる。By arranging the transmission optical system 2 and the reception optical system 3 in parallel, the center of the reception field of view and the center of the transmission beam coverage can be made to coincide with each other, and the reception viewing angle can be made approximately equal to the transmission beam divergence angle. By doing so, it is possible to remove external light other than the reflected light of the transmitted laser light by the target.

【0006】[0006]

【考案が解決しようとする課題】[Problems to be solved by the device]

従来の送受信光学系は以上のように構成されているので、目標が遠距離にある ときは受信視野と送信ビームの覆域を同心円上に重ねることができ、目標からの 反射光以外の外光を除去し、目標からの反射光を効率よく受光できるが、目標ま での距離が近くなると送信光学系と受信光学系のパララックスの効果により、送 信ビームの覆域が受信視野の中心から送信光学系の配置されている方向と逆方向 にずれていき、ついには受信視野から外れてしまう。したがって、近距離では、 目標があっても目標からの反射光を受信することができないという問題があった 。この様子を図6に示す。 Since the conventional transmission / reception optical system is configured as described above, when the target is at a long distance, it is possible to overlap the coverage of the reception field of view and the coverage of the transmission beam on a concentric circle, and to obtain external light other than the reflected light from the target. The reflected beam from the target can be received efficiently, but when the distance to the target becomes short, the coverage area of the transmission beam is changed from the center of the reception field due to the parallax effect of the transmission optical system and the reception optical system. It shifts in the direction opposite to the direction in which the transmission optics are arranged, and finally moves out of the reception field of view. Therefore, there was a problem that the reflected light from the target could not be received even if there was a target at a short distance. This state is shown in FIG.

【0007】 この考案は上記のような問題点を解消するためになされたもので、目標が近距 離にあっても、目標からの反射光を受光でき、しかも目標が遠距離にあるときは 、目標からの反射光以外の外光の除去効果のあるレーザ光送受信光学系を提供す ることを目的とする。The present invention was made in order to solve the above-mentioned problems, and it is possible to receive reflected light from a target even when the target is in a short distance, and when the target is in a long distance. It is an object of the present invention to provide a laser light transmitting / receiving optical system that has an effect of removing external light other than the reflected light from the target.

【0008】[0008]

【課題を解決するための手段】[Means for Solving the Problems]

この考案に係るレーザ光送受信光学系では、受信光学系の焦点位置に、光軸を 中心とする円形開口と、円形開口の送信光学系側と反対側の縁から、送信光学系 側と反対方向に、スリット状の開口を設けた遮光板を配置するようにした。 In the laser light transmission / reception optical system according to the present invention, a circular aperture centered on the optical axis is formed at the focus position of the reception optical system, and a direction opposite to the transmission optical system side from the edge of the circular aperture opposite to the transmission optical system side. In addition, a light shielding plate provided with a slit-shaped opening is arranged.

【0009】[0009]

【作用】[Action]

この考案によるレーザ光送受信光学系は、円形開口の送信光学系側と反対側の 縁から、送信光学系側と反対方向に、スリット状の開口を設けてあるので、目標 が近距離にあっても、目標からの反射光が開口を通過する。しかも、このスリッ ト部分は細いので、遠方の目標に対して目標からの反射光以外の外光を除去でき る。 In the laser light transmitting / receiving optical system according to the present invention, a slit-shaped opening is provided in the direction opposite to the transmitting optical system side from the edge of the circular opening opposite to the transmitting optical system side. Also, the reflected light from the target passes through the aperture. Moreover, since the slit portion is thin, it is possible to remove outside light other than the reflected light from the target for a distant target.

【0010】[0010]

【実施例】【Example】

実施例1. 以下、この考案の実施例を図について説明する。図1はこの考案のレーザ送受 信光学系の構成及びを示す図、図2は遮光板の開口形状を示す図、図6は受信視 野と送信ビームの覆域の関係を示す図である。図1において、1はレーザ発振器 、2は送信光学系、3は受信光学系、4は開口を設けた遮光板、5は受光素子で ある。図2において、Hは遮光板の開口であり、光軸を中心とする円形開口h1 と、この開口h1 の送信光学系側と反対側の縁から送信光学系側と反対方向にス リット状の開口h2 を有する。図3において、6は受信視野、7は送信ビームの 覆域であり、7aは目標が遠方にあるときの覆域、7bは目標が中程度の距離に あるときの覆域、7cは目標が近距離にあるときの覆域を示す。Example 1. An embodiment of this invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the configuration and structure of a laser transmission / reception optical system of the present invention, FIG. 2 is a diagram showing the aperture shape of a light shielding plate, and FIG. 6 is a diagram showing the relationship between the reception field and the coverage area of the transmission beam. In FIG. 1, 1 is a laser oscillator, 2 is a transmitting optical system, 3 is a receiving optical system, 4 is a light-shielding plate having an opening, and 5 is a light receiving element. In FIG. 2, H is an opening of the light shielding plate, and a circular opening h 1 centered on the optical axis and a slit from the edge of the opening h 1 on the side opposite to the transmission optical system side in the direction opposite to the transmission optical system side. Has an opening h 2 . In FIG. 3, 6 is the reception field of view, 7 is the coverage of the transmitted beam, 7a is the coverage when the target is at a distance, 7b is the coverage when the target is at a medium distance, and 7c is the coverage. Shows the coverage area at close range.

【0011】 次に動作について説明する。図1において、レーザ発振器1から出るレーザ光 は、送信光学系2に入り、送信ビーム広がり角を調整後、外部の目標に向けて送 信される。目標からの反射光は、受信光学系3で集光され、遮光板4を開口Hを 通過後、受光素子5にはいる。Next, the operation will be described. In FIG. 1, a laser beam emitted from a laser oscillator 1 enters a transmission optical system 2 and, after adjusting a transmission beam divergence angle, is transmitted toward an external target. The reflected light from the target is condensed by the receiving optical system 3, passes through the light shielding plate 4 through the opening H, and then enters the light receiving element 5.

【0012】 図3に示すように、目標が遠方にあるときは、送信ビームの覆域7aは円形開 口と同心円上に重なり、スリット部分の開口面積が円形部分の開口面積より狭い ため、従来のレーザ光送受信光学系のピンホールと同様に目標からの反射光を通 し周辺部の外光を遮光する効果がある。目標が中距離にある場合、送信ビームの 覆域7bは円形開口の中心からずれるが、目標が遠距離にある場合と同様の動作 となる。目標が近距離にある場合は、送信ビームの覆域7cは円形開口の外側に 出て、スリット部分に重なり、目標からの反射光は、一部分スリットを通過する 。目標が近距離にあるため、一部分の反射光が通過するだけでも、受光素子が作 動するのに必要なエネルギーが得られる。As shown in FIG. 3, when the target is distant, the coverage area 7a of the transmission beam overlaps with the circular opening on the concentric circle, and the opening area of the slit portion is narrower than the opening area of the circular portion. Similar to the pinhole of the laser light transmitting / receiving optical system, it has the effect of transmitting the reflected light from the target and blocking the external light in the peripheral area. When the target is at a medium distance, the coverage 7b of the transmission beam is displaced from the center of the circular aperture, but the operation is the same as when the target is at a long distance. When the target is in a short distance, the coverage 7c of the transmission beam goes out of the circular aperture and overlaps the slit portion, and the reflected light from the target partially passes through the slit. Since the target is at a short distance, even if only a part of the reflected light passes through, the energy required for the light receiving element to operate can be obtained.

【0013】[0013]

【考案の効果】[Effect of the device]

以上のように、この考案によれば、遮光板に円形開口の送信光学系側の縁から 、送信光学系側と反対方向に、スリット状の開口を設けてあるので、遠方の目標 からの反射光の受光性能を変化させずに、近距離の目標からの反射光を受光する ことができる。 As described above, according to the present invention, since the slit-shaped opening is provided in the light shielding plate from the edge of the circular opening on the side of the transmission optical system, in the direction opposite to the side of the transmission optical system, reflection from a target at a distance is achieved. It is possible to receive reflected light from a target at a short distance without changing the light receiving performance.

【図面の簡単な説明】[Brief description of drawings]

【図1】この考案の一実施例によるレーザ光送受信光学
系を示す図である。
FIG. 1 is a diagram showing a laser light transmitting / receiving optical system according to an embodiment of the present invention.

【図2】この考案の一実施例による開口を設けた遮光板
を示す図である。
FIG. 2 is a view showing a light blocking plate having an opening according to an embodiment of the present invention.

【図3】この考案の一実施例による受信視野と送信ビー
ムの覆域の関係を示す図である。
FIG. 3 is a diagram showing a relationship between a reception field of view and a coverage area of a transmission beam according to an embodiment of the present invention.

【図4】従来のレーザ光送受信光学系を示す図である。FIG. 4 is a diagram showing a conventional laser light transmitting / receiving optical system.

【図5】従来のピンホールを示す図である。FIG. 5 is a diagram showing a conventional pinhole.

【図6】従来の受信視野と送信ビームの覆域の関係を示
す図である。
FIG. 6 is a diagram showing a relationship between a conventional reception field of view and a coverage area of a transmission beam.

【符号の説明】[Explanation of symbols]

2 送信光学系 3 受信光学系 4 遮光板 2 Transmission optical system 3 Reception optical system 4 Light shield

Claims (1)

【実用新案登録請求の範囲】 【請求項1】 送信光学系と受信光学系を光軸が互いに
平行になるよう配置してなるレーザ光送受信光学系にお
いて、上記受信光学系の焦点位置に、光軸を中心とする
円形開口と、この円形開口の送信光学系側と反対側の縁
から送信光学系側と反対方向にスリット状の開口を設け
た遮光板を配置することを特徴とするレーザ光送受信光
学系。
Claims for utility model registration: 1. A laser beam transmitting / receiving optical system comprising a transmitting optical system and a receiving optical system arranged such that their optical axes are parallel to each other. A laser beam characterized by arranging a circular aperture centered on the axis and a light shielding plate provided with a slit-shaped aperture in a direction opposite to the transmission optical system side from the edge of the circular aperture opposite to the transmission optical system side. Transmission and reception optics.
JP5809791U 1991-07-24 1991-07-24 Laser light transmission / reception optical system Pending JPH0511082U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5809791U JPH0511082U (en) 1991-07-24 1991-07-24 Laser light transmission / reception optical system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5809791U JPH0511082U (en) 1991-07-24 1991-07-24 Laser light transmission / reception optical system

Publications (1)

Publication Number Publication Date
JPH0511082U true JPH0511082U (en) 1993-02-12

Family

ID=13074455

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5809791U Pending JPH0511082U (en) 1991-07-24 1991-07-24 Laser light transmission / reception optical system

Country Status (1)

Country Link
JP (1) JPH0511082U (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006047079A (en) * 2004-08-04 2006-02-16 Topcon Corp Distance-measuring instrument
JP2009145340A (en) * 2007-12-12 2009-07-02 Hilti Ag Laser rangefinder
JP2011511280A (en) * 2008-02-01 2011-04-07 ファロ テクノロジーズ インコーポレーテッド Objective distance measuring device
JP2011257193A (en) * 2010-06-07 2011-12-22 Ihi Corp Object detector
JP2014071026A (en) * 2012-09-28 2014-04-21 Denso Wave Inc Laser radar device
JP2018533026A (en) * 2015-11-05 2018-11-08 ルミナー テクノロジーズ インコーポレイテッド Lidar system with improved scan speed for creating high resolution depth maps

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006047079A (en) * 2004-08-04 2006-02-16 Topcon Corp Distance-measuring instrument
JP2009145340A (en) * 2007-12-12 2009-07-02 Hilti Ag Laser rangefinder
JP2011511280A (en) * 2008-02-01 2011-04-07 ファロ テクノロジーズ インコーポレーテッド Objective distance measuring device
JP2011257193A (en) * 2010-06-07 2011-12-22 Ihi Corp Object detector
JP2014071026A (en) * 2012-09-28 2014-04-21 Denso Wave Inc Laser radar device
JP2018533026A (en) * 2015-11-05 2018-11-08 ルミナー テクノロジーズ インコーポレイテッド Lidar system with improved scan speed for creating high resolution depth maps

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