JPS6239817A - Projector - Google Patents

Projector

Info

Publication number
JPS6239817A
JPS6239817A JP17947485A JP17947485A JPS6239817A JP S6239817 A JPS6239817 A JP S6239817A JP 17947485 A JP17947485 A JP 17947485A JP 17947485 A JP17947485 A JP 17947485A JP S6239817 A JPS6239817 A JP S6239817A
Authority
JP
Japan
Prior art keywords
mirror
lens
projection device
projection
optical
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
JP17947485A
Other languages
Japanese (ja)
Inventor
Fumitaka Yoshimura
文孝 吉村
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP17947485A priority Critical patent/JPS6239817A/en
Publication of JPS6239817A publication Critical patent/JPS6239817A/en
Pending legal-status Critical Current

Links

Landscapes

  • Optical Systems Of Projection Type Copiers (AREA)

Abstract

PURPOSE:To obtain a small-sized device by shortening the whole optical path length, by providing an optical system which has arranged plural lenses and plural mirrors in parallel roughly. CONSTITUTION:On an optical axis X1 of the first lens 11 of an object side, the first mirror 12 is placed at an interval of a distance l1. The second mirror 13 is placed in parallel roughly to the first lens 11 and also opposed at an interval of a distance l2 to the first mirror 12. An optical axis X2 of the second lens 14 is placed so as to go to parallel to the optical axis X1 of the first lens 11, and it is opposed at an interval of a distance l3 to the second mirror 13. An incident light Y1 from an object (not shown in the figure) passes through the first lens 11, reflected by the first mirror 12 and led to the second mirror 13, reflected and made incident on the second lens 14, and goes to an emitted light Y2 and emitted to a projection surface (not shown in the figure). Accordingly, the whole optical path length l of the optical system goes to about l=l1+l2+l3.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は光学的な投影装置、特に物体の鏡＠を投影面上
に形成する投影装置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 projection device, and particularly to a projection device that forms a mirror of an object on a projection surface.

（従来の技術） 従来、物体の鏡像を投影面上に形成する投影装置は、転
写行程を有している複写装置において特に用いられてお
り、この梅の複写装置等における投影装置は単眼レンズ
系即ち１つの光軸しか壱さない投影レンズ系が使用され
ていた。しかし単眼レンズ系を用いるとその光学的共役
距離が比較的長くなる為、単眼レンズ系を投影レンズ系
として用いた複写装置は小型化が困難であった。従って
複写装置の小型化の為に投影レンズ系の共役距離を短か
くする努力がなされ、その結果１つの解決手段として投
影レンズ系を比較的共役距離の短かいレンズ系が複数個
、光軸と垂直な方向に配列された複眼レンズ系で形成す
る投影装置が提案されている０例えば第６図に示すよう
に、物体側の第１レンズ１と像側の第２レンズ２とで構
成される全長りのレンズ系が使用されていた。この際、
第１レンズ１と第２レンズ２の距離ｔは、前記レンズ系
の全長りとハげ同じである。この投影装置においては複
眼レンズ系を構成する各々の要素レンズ系（物体と投影
面間に延長する光軸に沿って配列されたレンズ系）が投
影すべき物体の各部分の像をそれぞれ投影面上に形成し
、複眼レンズ系全体で物体全体の投影像を投影面に形成
する。(Prior Art) Conventionally, a projection device that forms a mirror image of an object on a projection surface has been particularly used in a copying device that has a transfer process. That is, a projection lens system having only one optical axis was used. However, when a monocular lens system is used, its optical conjugate distance becomes relatively long, so it has been difficult to miniaturize a copying apparatus using a monocular lens system as a projection lens system. Therefore, efforts were made to shorten the conjugate distance of the projection lens system in order to downsize copying machines, and as a result, one solution was to replace the projection lens system with multiple lens systems with relatively short conjugate distances, aligned with the optical axis. A projection device formed by a compound eye lens system arranged in a vertical direction has been proposed.For example, as shown in FIG. 6, it is composed of a first lens 1 on the object side and a second lens 2 on the image side. A full-length lens system was used. On this occasion,
The distance t between the first lens 1 and the second lens 2 is the same as the total length of the lens system. In this projection device, each elemental lens system (lens system arranged along the optical axis extending between the object and the projection surface) constituting the compound eye lens system produces an image of each part of the object to be projected on the projection surface. The entire compound eye lens system forms a projected image of the entire object on the projection plane.

例えば昭和４９年２月２８日に公告された昭和４９年特
許出願公告公報第８８９３号には複写されるべと原稿の
帯状領域をこの帯状領域の長手方向に清つて複数の要素
レンズ系を配列し、これらの要素レンズ系によって帯状
領域の各部分像を感光体上に形成する投影装置が示され
ている。For example, in Patent Application Publication No. 8893 published on February 28, 1971, a strip-shaped area of the original to be copied is cleaned in the longitudinal direction of this strip-shaped area and a plurality of element lens systems are arranged. However, a projection device is shown in which each partial image of a band-shaped area is formed on a photoreceptor by these elemental lens systems.

この投影装置の各々の要素レンズ系は３つのレンズ、す
なわち、前側、中間、後側レンズより構成されている。Each elemental lens system of this projection device is composed of three lenses: a front lens, an intermediate lens, and a rear lens.

そのような投影光学系に対して投影像の明るさを減少さ
せる事なく、要素レンズ系を構成するレンズの個数を少
なくした投影光学系が特開昭５３−１２２４２６号によ
り開示されているが、これらは全て物体の鏡像を投影面
上に等しい倍率で形成するだけの投影装置であった。For such a projection optical system, a projection optical system in which the number of lenses constituting the element lens system is reduced without reducing the brightness of the projected image is disclosed in Japanese Patent Laid-Open No. 122426/1983. All of these were projection devices that simply formed a mirror image of an object on the projection surface at equal magnification.

つまり、複眼レンズｅ系の全長を矩くして投影装置を小
型化にすることや、複眼レンズ系内に別の光学系、例え
ば物体のａｍを変倍可能にするための光学系を配置した
り、更に物体の鏡像に関する光量等の情報を検出するセ
ンター類を配置することは不可能であった。In other words, it is possible to make the total length of the compound eye lens e system rectangular to make the projection device more compact, or to arrange another optical system within the compound eye lens system, for example, an optical system to enable variable magnification of the am of the object. Furthermore, it was impossible to arrange centers for detecting information such as the amount of light regarding the mirror image of an object.

（発明が解決しようとする問題点） 本発明は、上記した従来の問題点を解決する目的でなさ
れ、光学系の全長を短くシ、且つ光学系内に種々の機能
を有する光学系又は物体の鏡像に関する光量等の情報を
検出するセンサー類を配置する事が出来る投影装置を提
撫しようとするものである。更に成形により簡単に製造
できる投影装置を提供するものである。(Problems to be Solved by the Invention) The present invention has been made for the purpose of solving the above-mentioned conventional problems. This is an attempt to develop a projection device that can be equipped with sensors that detect information such as the amount of light related to mirror images. Furthermore, the present invention provides a projection device that can be easily manufactured by molding.

（問題点を解決するための手段） 前記問題点を解決するための手段として、本発明による
投影装置は、複数のレンズと、複数のミラーから成り、
最も物体側に位置する第１レンズと、該第１レンズの光
軸上又は光軸近傍に配置された第１ミラーと、該第１ミ
ラーで反射された物体光の光路中にあり且つ該第１レン
ズと略平行に配列された第２ミラーと、該第２ミラーで
反射された物体光を結像する第２レンズとを有する事を
要旨とするものである。(Means for solving the problem) As a means for solving the problem, a projection device according to the present invention includes a plurality of lenses and a plurality of mirrors,
a first lens located closest to the object; a first mirror disposed on or near the optical axis of the first lens; and a first lens located in the optical path of the object light reflected by the first mirror. The gist of this is to have a second mirror arranged substantially parallel to the first lens, and a second lens that forms an image of the object light reflected by the second mirror.

（実施例） 以下、本発明を実施例によって詳細に説明する。(Example) Hereinafter, the present invention will be explained in detail with reference to Examples.

第１図は本発明に係る投影装置の概略構成図を示し、１
１は物体側の第２レンズ１４は第１ミラーであり、第１
レンズ１１の光軸Ｘ１上に距離ｔ１を隔てて第１ミラー
１２が配置されている。FIG. 1 shows a schematic configuration diagram of a projection device according to the present invention, 1
1, the second lens 14 on the object side is the first mirror;
A first mirror 12 is arranged on the optical axis X1 of the lens 11 at a distance t1.

又、１３は第２ミラーであり、第２ミラーｉ３は、第ル
ン、ｅ１１と略平行に配置すると共に、第１ミラー１２
と距離ｔ、を隔てて対向させる。１４は像側の第２レン
ズであり、第２レンズ１４の光軸Ｘ、が第１レンズ１１
の光軸Ｘ１と平行になるようにして配置すると共に、第
２オラー１３と距離ｔ、を隔てて対向させ、投影装置を
構成し【いる。Further, 13 is a second mirror, and the second mirror i3 is arranged substantially parallel to the first mirror e11, and the second mirror i3 is arranged substantially parallel to the first mirror 12.
and facing each other with a distance t between them. 14 is a second lens on the image side, and the optical axis X of the second lens 14 is the same as the first lens 11.
The projection device is arranged so as to be parallel to the optical axis X1 of the optical axis X1, and is opposed to the second optical axis 13 at a distance t.

物体（図示せず）からの入射光線Ｙ、は、第１レンズ１
１を通り第１ミラー１２で反射されて第２建ラー１３に
導かれる。そして再び第２ミラー讐３で反射されて第２
レンズ１４に入射し、投影面（図示せず）へ出射光＃Ｙ
、となって出射される。従って、本投影装置に於る光学
系の全光路長は略々ｔｗｔ、　＋ｔ、　＋ｔ、となる。An incident ray Y, from an object (not shown) is transmitted through the first lens 1
1, is reflected by the first mirror 12, and guided to the second mirror 13. Then, it is reflected again by the second mirror 3 and the second
Light #Y enters the lens 14 and exits to the projection surface (not shown)
, and is emitted. Therefore, the total optical path length of the optical system in this projection apparatus is approximately twt, +t, +t.

ここでｓｔＫ”・第１レンズ１１と第１定ラー１２間の
距離 ｔ、・・・第１Ｚラー１２と第２ンラー１３間の距離 ｔ、・・・第２ミラー１３と第２レンズ１４間の距離 を示し、又、レンズ系の全長りは、 １＝１１＝１゜ となる。即ち、レンズ系の全長りは、第１レンズ１１と
第１ミラー１２間の距離ｔ工及び第２ミラー１３と第２
レンズ１４間の距離ｔ、と同じ長さにできる。Here, stK''・Distance t between the first lens 11 and the first constant mirror 12, . . . Distance t between the first Z roller 12 and the second lens 13, . . . Between the second mirror 13 and the second lens 14 The total length of the lens system is 1=11=1°.In other words, the total length of the lens system is the distance t between the first lens 11 and the first mirror 12 and the second mirror 13 and 2nd
The length can be the same as the distance t between the lenses 14.

第２図は、本発明に係る投影装置の第２実施例を示すも
のであり、前記実施例と同一部材には同一符号を符し、
脱税は省略する。本実施例に於ては、第１ミラー１２と
第２ミラー１３の間に、一対のミラー１２ｍ及び１３ｍ
を前記第１ミラー１２及び第２ミラー１３と、夫々略平
行になるようにして対設し、更に同様にして配置した反
射ミラー１２＆＋１３１を、複数個（第２図においては
６個〕配列している。尚、他の構成は上述した第１実施
例と全く同様である。FIG. 2 shows a second embodiment of the projection apparatus according to the present invention, in which the same members as in the previous embodiment are denoted by the same reference numerals.
Tax evasion is omitted. In this embodiment, a pair of mirrors 12m and 13m are provided between the first mirror 12 and the second mirror 13.
are arranged opposite to the first mirror 12 and the second mirror 13 so as to be substantially parallel to each other, and a plurality (six in FIG. 2) of reflecting mirrors 12&+131 arranged in the same manner are arranged. Note that the other configurations are completely the same as the first embodiment described above.

従って、物体（図示せず）からの入射光Ｙ１は、第１レ
ンズ１１を通って第１ミラー１２と複数個のミラー１２
ｍ、１３１及び第２ミラー１３で反射され、第２レンズ
１４全通して投影面（図示せず）へ出射光Ｙ、として出
射されるので、第１レンズ１１から第２レンズ１４間の
光路長を、レンズ系の全長を変えることなく長くするこ
とができる。Therefore, incident light Y1 from an object (not shown) passes through the first lens 11 and passes through the first mirror 12 and the plurality of mirrors 12.
The optical path length between the first lens 11 and the second lens 14 is can be made longer without changing the overall length of the lens system.

第３図は、本発明に係る投影装置の第３実施例を示すも
のであり、前記実施例と同一部材には同一符号を符し、
説明は省略する。本実施例に於ては、第１ミラー１２と
第２ミラー１３の間の光路中に所定の機能を有する光学
系１５を配置したものである。例えば、他の光学系１５
としてズーム機能を有する光学系を配置する事により、
本発明の投影装置にズーム機構をもたせる事が出来る。FIG. 3 shows a third embodiment of the projection device according to the present invention, in which the same members as in the previous embodiment are denoted by the same reference numerals.
Explanation will be omitted. In this embodiment, an optical system 15 having a predetermined function is arranged in the optical path between the first mirror 12 and the second mirror 13. For example, other optical system 15
By arranging an optical system with a zoom function,
The projection device of the present invention can be provided with a zoom mechanism.

他の構成は上述した第１実施例と全く同様である。The other configurations are completely similar to the first embodiment described above.

第４図は１本発明に係る投影装置の第４実施例を示し、
前記第１実施例と同一部材には同一符号を符し、説明は
省略する。本実施例においては、第１ミラー１２にハー
フミラ−１６を用いたもので、他の構成は第１図の実施
例と全く同様である。FIG. 4 shows a fourth embodiment of a projection device according to the present invention,
The same members as those in the first embodiment are denoted by the same reference numerals, and explanations thereof will be omitted. In this embodiment, a half mirror 16 is used as the first mirror 12, and the other configurations are exactly the same as the embodiment shown in FIG.

従って、物体（図示せず）からの入射光ＭＹ□は、−・
−フミラー１６により投影面（図示せず）へ至る光線Ｙ
、と、ハーフミラ−１６を透過する光線Ｙ４に分岐され
る。そして、ハーフミラ−１６を透過した光線Ｙ４は、
ハーフミラ−１６の後方に配置した受光素子１７に入射
して、光量を測定する事が出来、例えば本発明による投
影装置を複写機尋に用いれば鏡像の磯淡の制御信号とし
て使用することが出来る。又、前記−・−７ミラー１６
の後方には、受光素子１７に限らず物体の鏡像に関する
様々な情報を、光学系の途中で感知する種々のセンサー
類を配置する事が出来る。Therefore, the incident light MY□ from an object (not shown) is -・
- Light ray Y reaching the projection surface (not shown) by the mirror 16
, the light beam is branched into a light beam Y4 that passes through the half mirror 16. The light ray Y4 transmitted through the half mirror 16 is
The amount of light can be measured by entering the light receiving element 17 placed behind the half mirror 16. For example, if the projection device according to the present invention is used in a copying machine, it can be used as a control signal for the mirror image. . Moreover, the above-mentioned ---7 mirror 16
Behind the light receiving element 17, it is possible to arrange various sensors that sense various information about the mirror image of the object in the middle of the optical system.

第５図は、本発明に係る投影装置の第５実施例を示し、
第１図に示した実施例と同一部材には同一符号を符し、
説明は省略する０本実施例に於ては、複数個の第ルンー
ｅ１１及び第２レンズ１４を、夫々−次元の直線アレイ
状に配列すると共に、第１ミラー１２及び第２ミラー１
３を、アレイ状に配列した第１レンズ１１及び第２レン
ズ１４の長さに対応させて、第１レンズ１１．第２ミラ
ー１３と、第１ミラー１２、第２レンズ１４を、夫夫一
体に形成したものである。FIG. 5 shows a fifth embodiment of the projection device according to the present invention,
The same members as those in the embodiment shown in FIG. 1 are designated by the same reference numerals.
In this embodiment, a plurality of lenses e11 and a plurality of second lenses 14 are arranged in a -dimensional linear array, and a first mirror 12 and a second mirror 1
3 corresponds to the lengths of the first lenses 11 and second lenses 14 arranged in an array. The second mirror 13, the first mirror 12, and the second lens 14 are formed as a husband and wife unit.

また、本実施例に限らず第１図〜第４図に示す実施例に
おいても、第１レンズ１１及び第２レンズ１４を直線ア
レイ状に複数個配列したり、第１レンズ１１、第２ミラ
ー１３と、第２ミラー１２、第２レンズ１４を、それぞ
れ一体に形成することが可能である。Further, not only in this embodiment but also in the embodiments shown in FIGS. 1 to 4, a plurality of first lenses 11 and second lenses 14 may be arranged in a linear array, or 13, the second mirror 12, and the second lens 14 can be formed integrally with each other.

（発明の効果） 以上説明したように、本発明に係る投影装置は、複数の
レンズと複数のミラーを略々平行に配列した光学系とす
る事により、光学全長を大幅に短縮することができ、小
型の投影装置を提供することが可能である。(Effects of the Invention) As explained above, the projection device according to the present invention has an optical system in which a plurality of lenses and a plurality of mirrors are arranged substantially in parallel, so that the total optical length can be significantly shortened. , it is possible to provide a compact projection device.

更に、第１及び第２オラー間の光路中に別の光学系を容
易に配置する事が出来、投影装置にズーム機能等の種々
の機能を備えさせる事が出来る。Furthermore, another optical system can be easily placed in the optical path between the first and second optical systems, and the projection device can be equipped with various functions such as a zoom function.

又、複数のミラーの少なくとも１つに、ノ・−フミラー
を使用する事により、物体の鏡ｒ象に関する光量等の情
報を検出するセンサー類を容易に配置することができ、
投影像の処理の為の情報信号をリアルタイムで検出出来
る等の利点を有し、その上、本投影装置を構成するレン
ズとミラーを一体化出来る等構成上、製造上極めて有効
な装置である。In addition, by using a no-f mirror as at least one of the plurality of mirrors, it is possible to easily arrange sensors that detect information such as the amount of light regarding the mirror image of the object.
This device has the advantage of being able to detect information signals for processing projected images in real time, and is also extremely effective in terms of construction and manufacturing, as it can integrate the lenses and mirrors that make up the projector.

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

第１図は、本発明に係る投影装置の構成例を示す概略図
、第２図は、本発明の第２実施例に係る投影装置を示す
概略図、第３図は本発明の第３実施例に係る投影装置を
示す概略図、第４図は、本発明の第４実施例に係る投影
装置を示す概略図、第５図は、本発明の第５実施例に係
る投影装置の要部を示す斜視図、第６図は、従来例にお
ける投影装置内の光学系を示す概略図である。 １１・・・第１レンズ、１２・・・第１ミラー、１２ａ
。 １３ｍ・・・反射ミラー、１３・・・第２電ラー、１４
・・・第２レンズ、１５・・・変倍光学系、１６・・・
ノ１−７ミラー、１７・・・受光素子、Ｘ、＃Ｘ、・・
・光軸、Ｙ。 ・・・入射光線、Ｙ、・・・出射光線、Ｙ、・・・ノ＼
−７ミラ＠１ −で反射された光線、Ｙ４・・・ハーフミラ−を透過し
た光線。 代理人弁理士　　山　下　積　平 図FIG. 1 is a schematic diagram showing a configuration example of a projection device according to the present invention, FIG. 2 is a schematic diagram showing a projection device according to a second embodiment of the present invention, and FIG. FIG. 4 is a schematic diagram showing a projection device according to a fourth embodiment of the present invention, and FIG. 5 is a schematic diagram showing a projection device according to a fifth embodiment of the present invention. FIG. 6 is a schematic diagram showing an optical system within a projection apparatus in a conventional example. 11... First lens, 12... First mirror, 12a
. 13m...Reflection mirror, 13...Second electric mirror, 14
...Second lens, 15...Variable magnification optical system, 16...
No. 1-7 mirror, 17...light receiving element, X, #X,...
・Optical axis, Y. ...Incoming ray, Y, ...Outgoing ray, Y, ...＼
Light rays reflected by -7 mirror @1 -, Y4... Light rays transmitted through half mirror. Representative Patent Attorney Hirazu Yamashita

Claims (6)

【特許請求の範囲】[Claims] （１）複数のレンズと、複数のミラーから成り、最も物
体側に位置する第１レンズと、該第１レンズの光軸上又
は光軸近傍に配置された第１ミラーと、該第１ミラーで
反射された物体光の光路中にあり且つ該第１レンズと略
平行に配列された第２ミラーと、該第２ミラーで反射さ
れた物体光を結像する第２レンズとを有する事を特徴と
する投影装置。(1) Consisting of a plurality of lenses and a plurality of mirrors, a first lens located closest to the object side, a first mirror disposed on or near the optical axis of the first lens, and the first mirror a second mirror located in the optical path of the object light reflected by the lens and arranged substantially parallel to the first lens; and a second lens for forming an image of the object light reflected by the second mirror. Characteristic projection device. （２）前記第１ミラーと前記第２ミラーとの間の光路中
に、少なくとも１対の相対するミラーを設けた事を特徴
とする特許請求の範囲第１項記載の投影装置。(2) The projection device according to claim 1, characterized in that at least one pair of opposing mirrors is provided in the optical path between the first mirror and the second mirror. （３）前記第１ミラーと前記第２ミラーの内少なくとも
一方にハーフミラーを用いた事を特徴とする特許請求の
範囲第１項記載の投影装置。(3) The projection apparatus according to claim 1, wherein a half mirror is used as at least one of the first mirror and the second mirror. （４）前記第１レンズと第２ミラー、及び前記第２レン
ズと第１ミラーが夫々同一部材に形成もしくは固着され
た事を特徴とする特許請求の範囲第１項記載の投影装置
。(4) The projection device according to claim 1, wherein the first lens and the second mirror, and the second lens and the first mirror are each formed or fixed to the same member. （５）前記第１レンズと第１ミラーと第２レンズと第２
ミラーとを１次元アレイ状に配列した事を特徴とする特
許請求の範囲第１項記載の投影装置。(5) The first lens, the first mirror, the second lens, and the second lens.
2. The projection device according to claim 1, wherein the mirrors are arranged in a one-dimensional array. （６）前記第１ミラーと前記第２ミラーとの光路中に変
倍レンズ系を設けた事を特徴とする特許請求の範囲第１
項記載の投影装置。(6) Claim 1, characterized in that a variable magnification lens system is provided in the optical path between the first mirror and the second mirror.
Projection device described in Section 2.
JP17947485A 1985-08-16 1985-08-16 Projector Pending JPS6239817A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17947485A JPS6239817A (en) 1985-08-16 1985-08-16 Projector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17947485A JPS6239817A (en) 1985-08-16 1985-08-16 Projector

Publications (1)

Publication Number Publication Date
JPS6239817A true JPS6239817A (en) 1987-02-20

Family

ID=16066476

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17947485A Pending JPS6239817A (en) 1985-08-16 1985-08-16 Projector

Country Status (1)

Country Link
JP (1) JPS6239817A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10967317B2 (en) 2015-08-18 2021-04-06 W. L. Gore & Associates, Inc. Filter assembly with curved inlet guide

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10967317B2 (en) 2015-08-18 2021-04-06 W. L. Gore & Associates, Inc. Filter assembly with curved inlet guide

Similar Documents

Publication Publication Date Title
US4272684A (en) Optical beam-splitting arrangements on object side of a lens
US5397887A (en) Focus detection apparatus having multiple detecting zones
JPH0884311A (en) Optical projection system
JP3566474B2 (en) Light beam scanning device
GB1564733A (en) Arrangement for extending photosensor array resolution
JP3359161B2 (en) Multi-point distance measuring device
US4467188A (en) Device for splitting light from an objective lens
JPS6239817A (en) Projector
US4141625A (en) Optical system for multiple imaging a linear object
US5572013A (en) Focus detection apparatus with a light shielding member
JP5183259B2 (en) Reader
US5546157A (en) Focus state detection device
JP3152795B2 (en) Camera ranging device
US4786150A (en) Zoom lens with beam splitter
JP3258085B2 (en) Line imaging device
JP3425583B2 (en) Optical device
JP3179162B2 (en) Focus detection device
JPH0485516A (en) Image forming element
JP2600934B2 (en) Projection system for automatic focus detection
JPS58219542A (en) Device for projecting optical image
JPS5844417A (en) Optical image forming device
KR100268377B1 (en) Reflective mirror array with mirrors that reflect even images
JPH07120699A (en) Line imaging element
JPS63118146A (en) Unmagnified image forming optical device
JP2018063276A (en) Optical scanner