JPH02199420A - Optical scanner - Google Patents
Optical scannerInfo
- Publication number
- JPH02199420A JPH02199420A JP1019962A JP1996289A JPH02199420A JP H02199420 A JPH02199420 A JP H02199420A JP 1019962 A JP1019962 A JP 1019962A JP 1996289 A JP1996289 A JP 1996289A JP H02199420 A JPH02199420 A JP H02199420A
- Authority
- JP
- Japan
- Prior art keywords
- mirror
- scanning mirror
- image
- concave
- scanning
- 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
- 230000003287 optical effect Effects 0.000 title claims abstract description 15
- 230000004907 flux Effects 0.000 abstract description 10
- 230000004075 alteration Effects 0.000 abstract description 6
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000003384 imaging method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 210000001747 pupil Anatomy 0.000 description 2
- 239000000470 constituent Substances 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003331 infrared imaging Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
Landscapes
- Mechanical Optical Scanning Systems (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は光学スキャナに係り、とくに赤外線撮像装置に
用いられる２軸のラスクスキャン方式の光学スキャナに
関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical scanner, and particularly to a two-axis Rusk scan type optical scanner used in an infrared imaging device.
第２図に基づいて従来例の説明を行う。 A conventional example will be explained based on FIG.
第２図に示す従来例は、読み取り面の反射光からなる光
束Ａを受けてその光束Ａを常に一直線上に反射させる回
動運動をする第１の走査鏡２１と、この第１の走査鏡２
１から送られてきた光束Ａを受けて結像する一直線上に
配設された凹面鏡２２と、この凹面鏡２２によってでき
た画像を第１の走査鏡２１と直角方向に回転しながら連
続的に変化させて常に一点に向けて反射する第２の走査
鏡２３と、この第２の走査鏡２３によって反射した画像
をうけて一点に集光する集光レンズ２４と、この集光レ
ンズ２４によって集光した光を受光する検知器２５とを
備えている。The conventional example shown in FIG. 2 includes a first scanning mirror 21 that receives a light flux A made of reflected light from a reading surface and rotates to always reflect the light flux A in a straight line; 2
A concave mirror 22 arranged on a straight line receives the light beam A sent from the first scanning mirror 2 and forms an image, and the image formed by this concave mirror 22 changes continuously while rotating in a direction perpendicular to the first scanning mirror 21. a second scanning mirror 23 that always reflects the image toward one point; a condensing lens 24 that receives the image reflected by the second scanning mirror 23 and condenses the light to one point; and a detector 25 that receives the emitted light.
さらにこれを詳述すると、凹面鏡２２は、球面形状の鏡
であり、瞳位置（曲率半径の位置）に配設されている第
１の走査鏡２１であるフレームミラーで反射された平行
な光束を、曲率半径の１７２の位置に結像させる。この
像は、読み取り面の水平方向の角度に従って第１の走査
鏡２１に照射され、角度をかえて反射して凹面鏡２２に
入射された光束が、結像面に連続的に像を結んだもので
ある。第２の走査鏡２３は多面鏡であって、光路上で像
面と集光レンズ２４との間にあり、前述の凹面鏡２２に
よって結像面に連続的に結像した像を、回転によって集
光レンズ２４に投影する。集光レンズ２４は、第２の走
査鏡２３によって反射された像面上の点像を検知器２５
に集光する。また、第２の走査鏡２３は光路を遮らない
ように、凹面鏡２２の軸位置からはずれた位置に配置さ
れているため、純粋な球面体ではなく、変形したものと
なっている。このように、第１の走査鏡２１であるフレ
ームミラーの回転と、第２の走査鏡２３である多面鏡の
回転により、ラスクスキャンが行われる。To explain this in more detail, the concave mirror 22 is a spherical mirror, and reflects a parallel light beam reflected by the frame mirror, which is the first scanning mirror 21, which is disposed at the pupil position (the position of the radius of curvature). , the image is formed at position 172 of the radius of curvature. This image is obtained by irradiating the first scanning mirror 21 according to the horizontal angle of the reading surface, reflecting at different angles, and entering the concave mirror 22, which continuously forms an image on the imaging surface. It is. The second scanning mirror 23 is a polygonal mirror, and is located between the image plane and the condensing lens 24 on the optical path, and rotates to converge the images continuously formed on the image plane by the concave mirror 22 described above. The image is projected onto the optical lens 24. The condenser lens 24 converts the point image on the image plane reflected by the second scanning mirror 23 into a detector 25.
The light is focused on. Further, since the second scanning mirror 23 is arranged at a position offset from the axis of the concave mirror 22 so as not to block the optical path, it is not a pure spherical body but a deformed one. In this way, rask scanning is performed by rotating the frame mirror, which is the first scanning mirror 21, and the polygon mirror, which is the second scanning mirror 23.
しかしながら、上記従来例においては、第２の走査鏡は
、光路を遮らないように、凹面鏡の軸位置からはずれた
位置に配置されているため、凹面鏡で光束が反射する際
に収差が大きくなり、画像を劣化させてしまうという欠
点が生じていた。そこで、これを避けるために凹面鏡の
曲率を大きくしたり、非球面形状としたり、または補正
用の光学系を追加して収差を小さくする工夫をしていた
が、これらの方法では装置が大型化し高価なものになる
という不都合が生じていた。However, in the above-mentioned conventional example, the second scanning mirror is placed at a position offset from the axis of the concave mirror so as not to block the optical path, so when the light beam is reflected by the concave mirror, aberration becomes large. This has the disadvantage of deteriorating the image. To avoid this, attempts have been made to reduce the aberration by increasing the curvature of the concave mirror, making it aspherical, or adding a correction optical system, but these methods increase the size of the device. This has caused the inconvenience of being expensive.
本発明の目的は、このような従来例に見られる不都合を
改善し、装置の大型化等を避けて、収差を小さくし、精
度の高い光学スキャナを提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide an optical scanner that improves the disadvantages seen in the conventional example, avoids increasing the size of the device, reduces aberrations, and has high precision.
本発明では、読み取り面の反射光からなる光束を受けて
その光束を常に一直線上に反射させる回動運動をする第
１の走査鏡と、この第１の走査鏡から送られてきた光束
を受けて結像する２一直線上に配設された凹面鏡と、こ
の凹面鏡によってできた画像を第１の走査鏡と直角方向
に回転しながら連続的に変化させて常に一点に向けて反
射する第２の走査鏡と、この第２の走査鏡によって反射
した画像をうけて一点に集光する集光レンズと、この集
光レンズによって集光した光を受光する検知器とを備え
ている。そして、凹面鏡による結像位置に小型平面鏡を
配設するとともに、第２の走査鏡を凹面鏡の軸面外に配
設するという手法を採っている。これによって、前述し
た目的を達成しようとするものである。In the present invention, there is provided a first scanning mirror that rotates to receive a luminous flux consisting of reflected light from a reading surface and always reflects the luminous flux in a straight line, and a first scanning mirror that receives the luminous flux sent from the first scanning mirror. 2 concave mirrors arranged in a straight line to form an image, and a second scanning mirror that continuously changes the image formed by this concave mirror while rotating at right angles to the first scanning mirror and always reflects it toward one point. It includes a scanning mirror, a condensing lens that receives the image reflected by the second scanning mirror and condenses the light to one point, and a detector that receives the light condensed by the condensing lens. A method is adopted in which a small plane mirror is disposed at the position where the image is formed by the concave mirror, and a second scanning mirror is disposed outside the axial plane of the concave mirror. This aims to achieve the above-mentioned objective.
［作 用］
読み取り面で反射した光束は第１の走査鏡に入射して、
常に一定の方向に向かうように向きを変化する。この第
１の走査鏡は、凹面鏡の軸面上に位置し、これによって
向きを変えた光束は、凹面鏡に入射して結像する。この
凹面鏡が結像する位置も、第１の走査鏡と同様に凹面鏡
の軸面上にあり、この結像位置に、小型平面鏡が配設さ
れている。小型平面鏡によって反射した結像画像は、第
１の走査鏡と直角方向に回転する第２の走査鏡に入射し
て、常に一点に向かって反射され、その位置に配設され
ている集光レンズに入射する。さらに、集光レンズに入
射した光束は、検知器に集光される。[Operation] The light beam reflected on the reading surface enters the first scanning mirror,
Change direction so that it always points in the same direction. This first scanning mirror is located on the axial plane of the concave mirror, and the light beam whose direction is changed thereby enters the concave mirror and forms an image. The position where this concave mirror forms an image is also on the axial plane of the concave mirror, similar to the first scanning mirror, and a small plane mirror is disposed at this image forming position. The formed image reflected by the small plane mirror enters a second scanning mirror that rotates at right angles to the first scanning mirror, and is always reflected toward one point, where it is reflected by a condensing lens disposed at that position. incident on . Furthermore, the light beam incident on the condenser lens is condensed onto a detector.
以下、本発明の一実施例を第１図に基づいて説明をする
。ここで、前述した従来例と同一の構成部材については
、同一の符号を用いることとする。Hereinafter, one embodiment of the present invention will be explained based on FIG. 1. Here, the same reference numerals are used for the same constituent members as in the conventional example described above.
第１図に示す実施例においては、読み取り面の反射光か
らなる光束を受けてその光束を常に一直線上に反射させ
る回動運動をする第１の走査鏡２１と、この第１の走査
鏡２１から送られてきた光束Ａを受けて結像する前記一
直線上に配設された凹面鏡２２と、この凹面鏡２２によ
ってできた画像を第１の走査鏡２１と直角方向に回転し
ながら連続的に変化させて常に一点に向けて反射する第
２の走査鏡２３と、この第２の走査鏡２３によって反射
した画像をうけて一点に集光する集光レンズ２４と、こ
の集光レンズ２４によって集光した光を受光する検知器
２５とを備えている。そして、凹面鏡２２が結像する位
置に小型平面鏡１を配設するとともに、第２の走査鏡２
３を凹面鏡２２の軸面外に配設している。In the embodiment shown in FIG. 1, there is provided a first scanning mirror 21 that receives a light beam composed of reflected light from a reading surface and has a rotating motion that always reflects the light beam in a straight line; A concave mirror 22 disposed on the straight line forms an image upon receiving the light beam A sent from the first scanning mirror 21, and the image formed by this concave mirror 22 is continuously changed while rotating in a direction perpendicular to the first scanning mirror 21. a second scanning mirror 23 that always reflects the image toward one point; a condensing lens 24 that receives the image reflected by the second scanning mirror 23 and condenses the light to one point; and a detector 25 that receives the emitted light. Then, the small plane mirror 1 is arranged at the position where the concave mirror 22 forms an image, and the second scanning mirror 2
3 is arranged outside the axial plane of the concave mirror 22.
これをさらに詳述すると、凹面鏡２２は球面体の一部分
よりなり、所定の巾をもってその赤道に平行に切断され
たものである。そして、第１の走査鏡２１は、凹面鏡２
２の赤道面上にある軸面上の瞳位置に配置されている。To explain this in more detail, the concave mirror 22 is made of a portion of a spherical body, and is cut parallel to the equator with a predetermined width. The first scanning mirror 21 is a concave mirror 2.
The pupil position is located on the axial plane on the equatorial plane of No. 2.
さらに、同様に軸面上にある凹面鏡２２の結像位置（曲
率半径の１／２位置）に小型平面鏡１を配設している。Furthermore, a small plane mirror 1 is disposed at the imaging position (1/2 position of the radius of curvature) of the concave mirror 22, which is also on the axial plane.
従って、第１の走査鏡２１と小型平面鏡１とは同一平面
上に位置することになる。そのため、小型平面鏡１は光
路を遮ることになるので、できるだけ小さな平面鏡であ
ることが望ましい。また、第２の走査鏡２３は回転多面
鏡であり、凹面鏡２２の軸面から外れた位置に配置され
、小型平面鏡１によって９０°光路を変更された光束を
受光し、常に一方向に回転している。その他の構成は、
前述した従来例と同一となっている。Therefore, the first scanning mirror 21 and the small plane mirror 1 are located on the same plane. Therefore, since the small plane mirror 1 blocks the optical path, it is desirable that the plane mirror be as small as possible. The second scanning mirror 23 is a rotating polygonal mirror, which is placed at a position off the axis of the concave mirror 22, receives the light beam whose optical path has been changed by 90 degrees by the small plane mirror 1, and always rotates in one direction. ing. Other configurations are
This is the same as the conventional example described above.
次に、本実施例の動作を説明する。まず、光源が読み取
り面を水平に走査し、そこで反射した光束は連続的に第
１の走査鏡２１に入射する。第１の走査鏡２１は、入射
してきた光束を反射して、凹面鏡２２上に光束を照射す
る。その結果、読み取り面からの反射光は、凹面鏡２２
上長手方向に直線的に順次入射することになる。凹面鏡
２２上に入射した光束は、小型平面鏡１上に像を結ぶ。Next, the operation of this embodiment will be explained. First, the light source horizontally scans the reading surface, and the light beam reflected thereon continuously enters the first scanning mirror 21. The first scanning mirror 21 reflects the incident light beam and irradiates the light beam onto the concave mirror 22 . As a result, the reflected light from the reading surface is reflected by the concave mirror 22.
The light is incident linearly and sequentially in the upper longitudinal direction. The light beam incident on the concave mirror 22 forms an image on the small plane mirror 1.
この像は、小型平面鏡１によって９０°方向を変えて、
第２の走査鏡２３である回転多面鏡に導かれる。この第
２の走査鏡２３は、回転することによって、順次小型平
面鏡１上に結像した像を拾って、集光レンズ２４に入射
していく。集光レンズ２４に入射した光束は、検知器２
５に像を結び、検知器２５はこれを感知して読み取りを
行う。続いて、第１の走査鏡２１が回転し、光源が読み
取り面の次の段を水平に走査すると、同様にして読み取
り面で反射した光束は連続的に第１の走査鏡２１に入射
する。そして、全く同様にして読み取った光が検知器２
５に像を結び、検知器２５はこれを感知して読み取りを
行うことになる。This image is changed in direction by 90 degrees by a small plane mirror 1,
It is guided to a rotating polygon mirror, which is the second scanning mirror 23. As the second scanning mirror 23 rotates, it sequentially picks up images formed on the small plane mirror 1 and makes them enter the condenser lens 24 . The light flux incident on the condenser lens 24 is transmitted to the detector 2
5, the detector 25 senses this and reads it. Subsequently, when the first scanning mirror 21 rotates and the light source horizontally scans the next stage of the reading surface, the light beam reflected from the reading surface in the same manner continuously enters the first scanning mirror 21. Then, the light read in exactly the same way is detected by the detector 2.
5, and the detector 25 senses this and reads it.
１・・・・・・小型平面鏡、２１・・・・・・第１の走
査鏡、２２・・・・・・凹面鏡、２３・・・・・・第２
の走査鏡、２４・・・・・・集光レンズ、２５・・・・
・・検知器。1... Small plane mirror, 21... First scanning mirror, 22... Concave mirror, 23... Second
scanning mirror, 24... condensing lens, 25...
...Detector.
特許出願人 日 本 電 気 株式会社〔発明の効果〕
以上のように、本発明によると、第１の走査鏡と小型平
面鏡とが、凹面鏡の軸面上である同一平面上に位置する
ことができるので、凹面鏡は構造が簡潔な球面体を用い
ることができ、また、装置を大型化することなく収差を
小さくすることができ、従って装置の小型化とともに精
度向上を図ることができるという従来にない優れた光学
スキャナを提供することができる。Patent Applicant: Japan Electric Co., Ltd. [Effects of the Invention] As described above, according to the present invention, the first scanning mirror and the small plane mirror can be located on the same plane, which is the axial plane of the concave mirror. Therefore, it is possible to use a spherical body with a simple structure as a concave mirror, and it is also possible to reduce aberrations without increasing the size of the device. Therefore, it is possible to improve accuracy while making the device smaller. No superior optical scanner can provide that.
Claims (1)
光束を常に一直線上に反射させる回動運動をする第１の
走査鏡と、この第１の走査鏡から送られてきた光束を受
けて結像する前記一直線上に配設された凹面鏡と、この
凹面鏡によってできた画像を第１の走査鏡と直角方向に
回転しながら連続的に変化させて常に一点に向けて反射
する第２の走査鏡と、この第２の走査鏡によって反射し
た画像をうけて一点に集光する集光レンズと、この集光
レンズによって集光した光を受光する検知器とを有して
成る光学スキャナにおいて、 前記凹面鏡による結像位置に小型平面鏡を配設するとと
もに、前記第２の走査鏡を前記凹面鏡の軸面外に配設し
たことを特徴とする光学スキャナ。(1) A first scanning mirror that rotates to receive a beam of light reflected from the reading surface and always reflect the beam in a straight line; a concave mirror disposed on the straight line that forms an image, and a second scanning mirror that continuously changes the image formed by the concave mirror while rotating at right angles to the first scanning mirror and always reflects the image toward one point. In an optical scanner comprising a scanning mirror, a condensing lens that receives an image reflected by the second scanning mirror and condenses the light to a single point, and a detector that receives the light condensed by the condensing lens. . An optical scanner, wherein a small plane mirror is disposed at a position where the image is formed by the concave mirror, and the second scanning mirror is disposed outside the axial plane of the concave mirror.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1019962A JPH02199420A (en) | 1989-01-30 | 1989-01-30 | Optical scanner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1019962A JPH02199420A (en) | 1989-01-30 | 1989-01-30 | Optical scanner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02199420A true JPH02199420A (en) | 1990-08-07 |
Family
ID=12013822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1019962A Pending JPH02199420A (en) | 1989-01-30 | 1989-01-30 | Optical scanner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02199420A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5113889A (en) * | 1974-07-26 | 1976-02-03 | Nippon Telegraph & Telephone | TAINETSUSEIJUGOTAINO SEIZOHOHO |
-
1989
- 1989-01-30 JP JP1019962A patent/JPH02199420A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5113889A (en) * | 1974-07-26 | 1976-02-03 | Nippon Telegraph & Telephone | TAINETSUSEIJUGOTAINO SEIZOHOHO |
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