JP2826619B2 - Rangefinder inspection equipment - Google Patents
Rangefinder inspection equipmentInfo
- Publication number
- JP2826619B2 JP2826619B2 JP16606189A JP16606189A JP2826619B2 JP 2826619 B2 JP2826619 B2 JP 2826619B2 JP 16606189 A JP16606189 A JP 16606189A JP 16606189 A JP16606189 A JP 16606189A JP 2826619 B2 JP2826619 B2 JP 2826619B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- distance
- measuring device
- distance measuring
- subject
- 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 - Fee Related
Links
Landscapes
- Measurement Of Optical Distance (AREA)
- Focusing (AREA)
- Automatic Focus Adjustment (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、光電的手段により距離情報を得ている測距
器が、正確に測距しているかを検査する測距器の検査装
置に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distance measuring device inspection device for inspecting whether a distance measuring device that obtains distance information by photoelectric means measures distance accurately. .
〔従来の技術〕 最近のカメラには、被写体までの距離に応じて撮影レ
ンズを合焦位置へ移動させるオートフォーカス装置が組
み込まれたものがある。オートフォーカス装置は光電的
手段によって被写体までの距離情報を得ている測距器を
有しており、このような測距器として第５図に示すよう
なものがある。同図において、投光部101から被写体102
に向けて赤外光線を投光し、投光部101から所定基線長
Ｌだけ隔たった受光部103で受光している。そして、受
光部103の出力信号を基線長Ｌに基づいて演算すること
によって、被写体までの距離情報を得ている。2. Description of the Related Art Some recent cameras incorporate an autofocus device that moves a taking lens to a focus position according to a distance to a subject. The autofocus device has a distance measuring device that obtains distance information to a subject by photoelectric means. As such a distance measuring device, there is one as shown in FIG. Referring to FIG.
, And is received by a light receiving unit 103 that is separated from the light emitting unit 101 by a predetermined base line length L. Then, by calculating the output signal of the light receiving unit 103 based on the base line length L, distance information to the subject is obtained.
ところで、オートフォーカス装置が組み込まれたカメ
ラは、製品として出荷する前には、このオートフォーカ
ス装置の測距器が正確に測距しているか検査しなければ
ならない。そこで、測距器の前に被写体を近距離から遠
距離にかけて位置させ、被写体までの距離を測定してい
る。このように、測距器で被写体までの距離を測定する
には所定の実距離が必要であった。By the way, before a camera incorporating an autofocus device is shipped as a product, it is necessary to inspect whether or not the distance measuring device of the autofocus device measures the distance accurately. Therefore, the subject is positioned from a short distance to a long distance in front of the distance measuring device, and the distance to the subject is measured. As described above, a predetermined actual distance is required to measure the distance to the subject with the distance measuring device.
しかしながら、オートフォーカス装置の測距器の作動
を検査するのに広い検査場所を必要としているので、こ
の検査場所を確保するのは、最近では困難になってきて
いる。また、例えば工場敷地が次第に手狭になっていく
と、この検査場所によって他目的のための場所が侵食さ
れる形となっていた。However, since a large inspection area is required to inspect the operation of the distance measuring device of the autofocus device, it has recently become difficult to secure this inspection area. In addition, for example, when the factory site becomes gradually smaller, the inspection site erodes a site for another purpose.
そこで、反射鏡を光路中に配置して赤外光線を反射さ
せ、検査場所ならびに設備をなるべく小さくするように
工夫したりしている。しかし、赤外光線を反射させて検
査場所ならびに設備をいかに小さく工夫しても、投光部
101から受光部103までの光路長さはなおも必要であっ
た。このため、やはり検査場所は大きくならざるを得
ず、この検査場所を確保するのが困難であった。また、
例えば他目的のための場所が、やはり相対的に侵食され
てしまうという課題があった。Therefore, a reflecting mirror is arranged in the optical path to reflect infrared rays, and the inspection place and equipment are designed to be as small as possible. However, no matter how small the inspection place and equipment are, by reflecting infrared light,
The optical path length from 101 to the light receiving section 103 was still necessary. For this reason, the inspection place must be large, and it is difficult to secure this inspection place. Also,
For example, there is a problem that a place for another purpose is also relatively eroded.
このような課題を解決するために、本発明にあって
は、物体へ投光する投光部と前記物体からの反射光を受
光する受光部とを有する測距器に対向し、該測距器の投
光部の投光方向に配設された反射部材と、前記投光部か
ら該反射部材への投光路中に介設され前記物体の距離に
対応して該投光路を偏角する偏角プリズム機構と、前記
投光部から受光部までの光路中に介設されて透過光量を
前記物体までの距離に応じて制御する光量制御手段とを
備えた構成とするものである。In order to solve such a problem, according to the present invention, a distance measuring device having a light projecting unit for projecting light to an object and a light receiving unit for receiving light reflected from the object is provided. A reflecting member disposed in a light projecting direction of the light projecting portion of the light source, and a light projecting path interposed in the light projecting path from the light projecting portion to the reflecting member, and deflecting the light projecting path corresponding to the distance of the object. The apparatus includes a deflection prism mechanism and light amount control means interposed in an optical path from the light projecting unit to the light receiving unit and controlling the amount of transmitted light according to the distance to the object.
本発明によれば、オートフォーカス装置の測距器が被
写体までの距離を正確に測定しているかを検査する場合
に、偏角プリズム機構によって被写体までの光路を短縮
しているので、被写体までの距離を短縮することができ
る。また、このとき光量制御手段によって光の透過光量
を制御して、受光部の受光量を減光させるようにしたの
で、測距器は適正に作動する。According to the present invention, the optical path to the subject is shortened by the deflection prism mechanism when checking whether or not the distance measuring device of the autofocus device accurately measures the distance to the subject. The distance can be shortened. At this time, since the transmitted light amount of the light is controlled by the light amount control means to reduce the amount of light received by the light receiving unit, the distance measuring device operates properly.
以下、本発明を図面に基づいて説明する。第１図ない
し第４図は本発明に係る測距器の検査装置の一実施例を
示す図である。Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 to FIG. 4 are views showing an embodiment of a distance measuring device inspection apparatus according to the present invention.
第１図において、符号１はカメラに組み込まれたオー
トフォーカス装置の測距器であり、この測距器１は被写
体に向けて赤外光線を投光する投光部２と、この投光部
２から所定基線長だけ離れて配設され、被写体からの反
射光を受光する受光部３とを有している。投光部２の投
光方向には反射部材としての標準反射板４（支持板に灰
色用紙を貼着したもの）が配設され、投光部２から標準
反射板４への投光路中には偏角プリズム機構11が介設さ
れている。In FIG. 1, reference numeral 1 denotes a distance measuring device of an auto-focusing device incorporated in a camera. The distance measuring device 1 includes a light projecting unit 2 for projecting an infrared ray toward a subject, and a light projecting unit. And a light receiving unit 3 that is arranged at a predetermined base line distance from the light receiving unit 2 and receives light reflected from the subject. A standard reflection plate 4 (a gray sheet is adhered to a support plate) as a reflection member is disposed in a light projection direction of the light projection unit 2, and is provided in a light path from the light projection unit 2 to the standard reflection plate 4. Is provided with a deflection prism mechanism 11.
偏角プリズム機構11は第２図および第３図に示すよう
に一対のロータリープリズム12,13（Ｗ−Ｌ TCHNOLOGI
ES JAPAN INCの商標名）と、このロータリープリズム
12,13の外周部を支持するとともに外周に歯部が形成さ
れ、第１、第２回転歯車14,15と、この第１、第２回転
歯車14,15を回転させる駆動歯車16と、第１、第２回転
歯車14,15を互いに逆方向に回転させるための第１、第
２アイドル歯車17,18とから構成されている。一対のロ
ータリープリズム12,13は光軸線方向に対向配設されて
おり、互いに反対側の面は傾斜面となっている。第１回
転歯車14には第１アイドル歯車17が噛合い、第１アイド
ル歯車17には第２アイドル歯車18が噛合い、第２アイド
ル歯車18は第２回転歯車15と噛合っている。一方、第１
アイドル歯車17は駆動歯車16と噛合っている。As shown in FIGS. 2 and 3, the deflection prism mechanism 11 includes a pair of rotary prisms 12, 13 (W-L TCHNOLOGI).
ES JAPAN INC trademark) and this rotary prism
A tooth portion is formed on the outer periphery while supporting the outer peripheral portions of the first and second rotating gears 14 and 15, the driving gear 16 for rotating the first and second rotating gears 14 and 15, It comprises first and second idle gears 17 and 18 for rotating the first and second rotary gears 14 and 15 in directions opposite to each other. The pair of rotary prisms 12 and 13 are disposed to face each other in the optical axis direction, and the surfaces opposite to each other are inclined surfaces. A first idle gear 17 meshes with the first rotary gear 14, a second idle gear 18 meshes with the first idle gear 17, and a second idle gear 18 meshes with the second rotary gear 15. Meanwhile, the first
The idle gear 17 meshes with the drive gear 16.
駆動歯車16がステップモータ等の第１駆動部19によっ
て回転駆動されると、第１、第２アイドル歯車17,18を
介して第１、第２回転歯車14,15は互いに逆方向に回転
される。このようにして、第１、第２回転歯車14,15に
よってロータリープリズム12,13を互いに逆方向に回転
させることにより、ロータリープリズム12,13を透過す
る赤外光線を屈折させてぶれの角を生じさせ、赤外光線
の方向を変えるようにしている。すなわち、偏角プリズ
ム機構11の作動によって投光部２から投光する赤外光線
の方向を変えることができる。When the driving gear 16 is rotationally driven by a first driving unit 19 such as a step motor, the first and second rotating gears 14 and 15 are rotated in opposite directions via the first and second idle gears 17 and 18. You. Thus, by rotating the rotary prisms 12 and 13 in directions opposite to each other by the first and second rotary gears 14 and 15, the infrared light passing through the rotary prisms 12 and 13 is refracted to reduce the angle of blur. And change the direction of the infrared light. That is, the direction of the infrared ray projected from the light projecting unit 2 can be changed by the operation of the deflection prism mechanism 11.
ところで、被写体が遠距離に位置している場合には、
投光部２から投光され、被写体から受光部３に至る光路
に向けて偏角プリズム機構11から出射する角度は大き
く、被写体が近づくにつれてこの偏角は小さくなる。こ
のため、被写体の位置に応じて第１駆動手段19によって
偏角プリズム機構11を作動させ、赤外光線の方向が変え
られる。すなわち、被写体が遠距離に位置する場合（第
１図中Ａ位置）には、投光部２から偏角プリズム機構11
までの投光路に対して、標準反射板４から受光部３まで
の受光路の偏角（θ１）を大きくし、一方、被写体が近
距離に位置している場合（第１図中Ｂ位置）には、今度
は逆に投光路と受光路の偏角（θ２）を小さくする。By the way, when the subject is located at a long distance,
The angle of light emitted from the light projecting unit 2 and emitted from the deflection prism mechanism 11 toward the optical path from the subject to the light receiving unit 3 is large, and this deflection angle decreases as the subject approaches. For this reason, the deflection angle prism mechanism 11 is operated by the first driving means 19 according to the position of the subject, and the direction of the infrared ray is changed. That is, when the subject is located at a long distance (A position in FIG. 1), the deflection prism mechanism 11
The deviation angle (θ 1 ) of the light receiving path from the standard reflection plate 4 to the light receiving unit 3 is increased with respect to the light projecting path up to, while the subject is located at a short distance (position B in FIG. 1). ), The declination (θ 2 ) between the light projecting path and the light receiving path is reduced.
反射板４と受光部３との間には、フィルター７が介設
され、このフィルター７は第４図に示すように全体が円
板状のガラスであって、その中心部には回動軸7aが形成
されている。また、フィルター７は入射光の成分を変え
ることなく透過光量を減光させる赤外光線用フィルター
である。フィルター７はその半径方向部分の減光率が同
一となっており、円周方向に向けての減光率が徐々に異
なるように形成されている。A filter 7 is interposed between the reflection plate 4 and the light receiving unit 3, and the filter 7 is a disk-shaped glass as a whole as shown in FIG. 7a is formed. The filter 7 is an infrared light filter that reduces the amount of transmitted light without changing the component of incident light. The filter 7 has the same extinction ratio in the radial direction, and is formed so that the extinction ratio in the circumferential direction gradually changes.
一般に、被写体が遠距離に位置していると、受光部３
で受光する反射光はその光量が距離の２乗に比例して減
光する。ところが、偏角プリズム機構11で光路を短縮し
て、被写体の近距離位置から遠距離位置に対応するよう
に偏角させているので、受光部３で受光する反射光は正
比例して減光しない。ここで、遠距離にある被写体を測
距器１で測定する場合には、赤外光線の偏光角度に応じ
た受光部３の出力信号とともに受光部３の減光された光
量に基づいて測距情報を得ている。このため、偏角プリ
ズム機構11によって光路を短縮した場合、受光部３で受
光される光量は距離に応じて減光されないので、測距器
１は適正に作動せず誤った測距情報しか得られないこと
になる。Generally, when the subject is located at a long distance, the light receiving unit 3
The amount of the reflected light received by the light source decreases in proportion to the square of the distance. However, since the deflected prism mechanism 11 shortens the optical path and deviates the light so as to correspond to the subject from a short distance position to a long distance position, the reflected light received by the light receiving unit 3 does not diminish in direct proportion. . Here, when the object at a long distance is measured by the distance measuring device 1, the distance is measured based on the output signal of the light receiving unit 3 corresponding to the polarization angle of the infrared light and the reduced light amount of the light receiving unit 3. Get information. Therefore, when the optical path is shortened by the deflection prism mechanism 11, the light amount received by the light receiving unit 3 is not reduced according to the distance, so that the distance measuring device 1 does not operate properly and only erroneous distance measuring information is obtained. Will not be able to do it.
そこで、被写体の位置に応じた受光部３の減光量をマ
イクロコンピュータ等の演算部20によって演算し、この
減光量に基づいてさらにフィルター７の透過光量を演算
し、この演算結果をステップモータなどの第２駆動部21
に出力する。第２駆動部21は演算された透過光量に応じ
て歯車機構等を介して回動軸7aを回動させ、反射板４の
位置に応じたフィルター７の適正な減光率の部分に、反
射された赤外光線を位置させる。したがって、受光部３
には被写体の距離に応じて減光した赤外光線が入射し、
正確な測距情報が得られることになる。Therefore, the amount of light reduction of the light receiving unit 3 according to the position of the subject is calculated by the calculation unit 20 such as a microcomputer, and the amount of light transmitted through the filter 7 is further calculated based on the amount of light reduction. Second drive unit 21
Output to The second drive unit 21 rotates the rotation shaft 7a via a gear mechanism or the like according to the calculated transmitted light amount, and reflects the light to the appropriate dimming rate portion of the filter 7 according to the position of the reflection plate 4. The infrared light. Therefore, the light receiving unit 3
Infrared rays, which are dimmed according to the distance of the subject, enter the
Accurate ranging information can be obtained.
なお、フィルター７、第１駆動部19、および演算部20
は全体として光量制御手段を構成している。またフィル
ター７は反射板４の位置に応じた適正な減光率部分に手
動で回動するようにしてもよい。The filter 7, the first drive unit 19, and the arithmetic unit 20
Constitute light quantity control means as a whole. Further, the filter 7 may be manually rotated to an appropriate dimming rate portion according to the position of the reflection plate 4.
一方、フィルター７は反射板４と受光部３との受光路
中に介設したが、投光部２と反射板４との投光路中に介
設してもよく、あるいは前記受光路と投光路の両方に亘
って介設してもよい。On the other hand, although the filter 7 is interposed in the light receiving path between the reflector 4 and the light receiving section 3, it may be interposed in the light emitting path between the light projecting section 2 and the reflecting plate 4, or alternatively, the filter 7 may be interposed between the light receiving path and the light receiving path. It may be provided over both of the optical paths.
オートフォーカス装置の測距器１が正確に作動してい
るかを検査する場合には、設定された被写体の距離を演
算部20に入力すると、この演算部20から第２駆動部21に
信号が出力され、偏角プリズム機構11を作動させて光路
を適正に偏角する。この測距結果が前記距離と一致する
かを検査する。このとき偏角プリズム機構11によって被
写体までの光路を短縮しているので、被写体までの距離
を圧縮することができる。また、このときフィルター７
によって光の透過光量を制御して、受光部３の受光量を
減光させるようにしたので、測距器１は適正に作動す
る。したがって測距器１の検査場所を小さくすることが
でき、この検査場所の確保が可能となる。例えば、工場
敷地が次第に手狭になってきても、他の目的のための場
所を相対的に侵食するようなことはない。In order to check whether or not the distance measuring device 1 of the autofocus device is operating correctly, when the set distance of the subject is input to the calculating unit 20, a signal is output from the calculating unit 20 to the second driving unit 21. Then, the deflector prism mechanism 11 is operated to appropriately deviate the optical path. It is checked whether the distance measurement result matches the distance. At this time, since the optical path to the subject is shortened by the deflection prism mechanism 11, the distance to the subject can be reduced. At this time, filter 7
The distance measuring device 1 operates properly because the transmitted light amount of the light is controlled to reduce the amount of light received by the light receiving section 3. Therefore, the inspection place of the distance measuring device 1 can be reduced, and this inspection place can be secured. For example, even if the factory site gradually becomes smaller, it does not relatively erode sites for other purposes.
なお、フィルター７の代わりに、シャッタ羽根などに
よって機械的に絞ったり、PLZTすなわちPbZrO3とPbTiO3
の固溶体にLaを添加した金属酸化物の透明な焼結体を用
いてもよく、また液晶に電圧をかけるなどの方法でもよ
い。Note that, instead of the filter 7, the diaphragm is mechanically squeezed by a shutter blade or the like, or PLZT, that is, PbZrO 3 and PbTiO 3
A transparent sintered body of a metal oxide in which La is added to the solid solution may be used, or a method of applying a voltage to the liquid crystal may be used.
また、偏角プリズム機構の制御に合わせて反射板４を
も組み合わせて移動させても、本発明の技術思想を実現
することができる。Also, the technical idea of the present invention can be realized by moving the reflector 4 in combination with the control of the deflection prism mechanism.
さらに、前記実施例にあっては、カメラのオートフォ
ーカス装置の測距器の検査装置に適用した例を示した
が、これに限らず精密機器の測距器の検査装置に適用し
てもよい。Furthermore, in the above-described embodiment, an example in which the present invention is applied to an inspection device of a distance measuring device of an autofocus device of a camera has been described. However, the present invention is not limited to this, and may be applied to an inspection device of a distance measuring device of a precision instrument. .
以上説明したように本発明によれば、投光部の投光方
向に偏角プリズム機構を介設して光路を短縮し、投光部
から受光部までの光路の透過光量を適正に制御して受光
部の受光量を減光させるようにしたので、測距器の検査
場所は小さくすることができ、この検査場所の確保が可
能となる。また、例えば工場敷地が次第に手狭になって
きても、他の目的のための場所を相対的に侵食するよう
なことはない。As described above, according to the present invention, the light path is shortened by providing a deflection prism mechanism in the light projecting direction of the light projecting section, and the transmitted light amount of the light path from the light projecting section to the light receiving section is appropriately controlled. Since the amount of light received by the light receiving section is reduced, the inspection area of the distance measuring device can be reduced, and this inspection area can be secured. Also, for example, even if the factory site is gradually becoming smaller, it does not relatively erode the space for other purposes.
第１図ないし第４図は本発明に係る測距器の検査装置の
一実施例を示す図であり、第１図はこの検査装置の概略
全体図、第２図は偏角プリズム機構の分解斜視図、第３
図はその断面図、第４図はこの制御手段に用いられたフ
ィルターの斜視図、第５図は従来の測距器の概略図であ
る。 １……測距器、２……投光部 ３……受光部、４……反射板 ５……コリメータレンズ、７……フィルター 19……第１駆動部、20……演算部 21……第２駆動部1 to 4 are views showing an embodiment of an inspection device for a distance measuring device according to the present invention. FIG. 1 is a schematic overall view of this inspection device, and FIG. 2 is an exploded view of a deflection prism mechanism. Perspective view, third
FIG. 4 is a sectional view, FIG. 4 is a perspective view of a filter used in the control means, and FIG. 5 is a schematic view of a conventional distance measuring device. DESCRIPTION OF SYMBOLS 1 ... Distance measuring device, 2 ... Emission part 3 ... Reception part 4, ... Reflection plate 5 ... Collimator lens, 7 ... Filter 19 ... First drive part, 20 ... Calculation part 21 ... Second drive unit
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) G01C 3/00 - 3/32 G02B 7/00 - 7/40 G03B 13/00 - 13/36 G03B 43/00 - 43/02──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) G01C 3/00-3/32 G02B 7/00-7/40 G03B 13/00-13/36 G03B 43 / 00-43/02
Claims (1)
射光を受光する受光部とを有する測距器に対向し、該測
距器の投光部の投光方向に配設された反射部材と、前記
投光部から該反射部材への投光路中に介設され前記物体
の距離に対応して該投光路を偏角する偏角プリズム機構
と、前記投光部から受光部までの光路中に介設されて透
過光量を前記物体までの距離に応じて制御する光量制御
手段とを備えたことを特徴とする測距器の検査装置。1. A distance measuring device having a light projecting portion for projecting light to an object and a light receiving portion for receiving reflected light from the object, and disposed in a light projecting direction of the light projecting portion of the distance measuring device. A reflecting member, an eccentric prism mechanism interposed in an illuminating path from the illuminating section to the reflecting member and eccentrically deflecting the illuminating path corresponding to a distance of the object, and receiving light from the illuminating section. A light quantity control means interposed in an optical path to the unit and controlling a transmitted light quantity according to a distance to the object.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16606189A JP2826619B2 (en) | 1989-06-28 | 1989-06-28 | Rangefinder inspection equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16606189A JP2826619B2 (en) | 1989-06-28 | 1989-06-28 | Rangefinder inspection equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0329812A JPH0329812A (en) | 1991-02-07 |
| JP2826619B2 true JP2826619B2 (en) | 1998-11-18 |
Family
ID=15824250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16606189A Expired - Fee Related JP2826619B2 (en) | 1989-06-28 | 1989-06-28 | Rangefinder inspection equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2826619B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007198841A (en) * | 2006-01-25 | 2007-08-09 | Soatec Inc | Optical measuring method and apparatus |
| JP6621305B2 (en) * | 2015-11-10 | 2019-12-18 | 株式会社トプコン | Surveying system |
-
1989
- 1989-06-28 JP JP16606189A patent/JP2826619B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0329812A (en) | 1991-02-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6324024B1 (en) | Reflector for distance measurement | |
| US6046800A (en) | Position detection surveying device | |
| JP4398702B2 (en) | projector | |
| EP2275865A1 (en) | Projection optical system, projection unit, and projection display device | |
| JP3445491B2 (en) | Surveying instrument | |
| JP2000097699A (en) | Automatic surveying instrument | |
| JP2826619B2 (en) | Rangefinder inspection equipment | |
| JP2826618B2 (en) | Rangefinder inspection equipment | |
| JP2003043582A (en) | Image projection unit and projection type image display device | |
| US5390044A (en) | Circular arc illumination apparatus | |
| US3923396A (en) | Variable base rangefinder | |
| JP3069896B2 (en) | Laser planar | |
| JP2000046554A (en) | Laser measuring instrument | |
| US4005442A (en) | Automatic focusing mechanism | |
| JP2956058B2 (en) | Optical space transmission equipment | |
| JPH064256Y2 (en) | Reflector device | |
| JP2001082959A (en) | Surevey instrument with alarm device for indicating excess from permissible range of inclination | |
| JPS6159442B2 (en) | ||
| JP3752060B2 (en) | Parallel adjustment method of straight beam | |
| JP3090782B2 (en) | Surveying instrument | |
| KR100302841B1 (en) | Adjustable viewfinder unit for video cameras | |
| JPH11337796A (en) | Image pickup device | |
| JP2001083387A (en) | Lens barrel and projection display device provided therewith | |
| JP2000097700A (en) | Surveying instrument | |
| JPH06175014A (en) | Camera provided with autofocusing mechanism |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |