JP2003121783A - Image forming apparatus - Google Patents
Image forming apparatusInfo
- Publication number
- JP2003121783A JP2003121783A JP2001313695A JP2001313695A JP2003121783A JP 2003121783 A JP2003121783 A JP 2003121783A JP 2001313695 A JP2001313695 A JP 2001313695A JP 2001313695 A JP2001313695 A JP 2001313695A JP 2003121783 A JP2003121783 A JP 2003121783A
- Authority
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- Japan
- Prior art keywords
- reflecting mirror
- image forming
- optical system
- forming apparatus
- optical path
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、画像形成装置の改
良、特に、ＤＭＤ（Digital Micromirror Device）を画
像形成素子として利用した画像形成装置の改良に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an image forming apparatus, and more particularly to an improvement in an image forming apparatus using a DMD (Digital Micromirror Device) as an image forming element.
【０００２】[0002]
【従来の技術】近年のプロジェクター市場では、ＣＲＴ
プロジェクターに代わり、ＤＭＤプロジェクターで拡大
投影する装置が現れ始めている。リアプロジェクターで
は、その構造上、薄型・軽量の要求が高まりつつあり、
また、フロント型のプロジェクターにおいても家庭用へ
の展開として、部屋が小さくても拡大投写できるように
する必要性が出てきたのがその理由である。2. Description of the Related Art In the recent projector market, CRTs have been used.
A device for enlarging and projecting with a DMD projector is starting to appear in place of the projector. Due to its structure, the demand for thin and lightweight rear projectors is increasing,
The reason for this is that even for front type projectors, it has become necessary to expand and project even if the room is small, as a development for home use.
【０００３】近距離投写および広画角化のへの対応とし
て、反射型結像光学系を用いる方法がＰＣＴ／ＪＰ９６
／０１７６７公報や、特開平１０−１１１４５８号に開
示されている。反射型結像光学系には、色収差がない，
光路の折り畳みが可能で小型化ができる，内面反射が少
なく高いコントラストが得られる，簡単な構成で高い解
像度が得られる等の多くの利点を持つことを利用して、
様々な提案がなされている。In order to cope with short-distance projection and wide angle of view, a method using a reflection type image forming optical system is PCT / JP96.
/ 01767 and Japanese Patent Laid-Open No. 10-111458. The reflective imaging optical system has no chromatic aberration,
Taking advantage of many advantages such as folding of the optical path, miniaturization, high internal contrast with low internal reflection, and high resolution with a simple structure,
Various proposals have been made.
【０００４】また、本出願人らも特願２０００−２２８
７９８号として図６に一例を示すような反射型結像光学
系を開示した。この結像光学系１は、図６に示されるよ
うに、画像形成素子２に凹面を向けた自由曲面形状を有
する第１反射鏡３ａと、第１反射鏡３ａからの光束に凸
面を向けた自由曲面形状を有する第２反射鏡３ｂと、第
２反射鏡３ｂからの光束に凸面を向けた自由曲面形状を
有する第３反射鏡３ｃと、第３反射鏡３ｃからの光束に
凹面を向けた回転対称非球面形状を有する第４反射鏡３
ｄにより構成され、また、画像形成素子２を照らす照明
光学系４はランプ５によって構成されている。Further, the present applicants also applied for a patent application 2000-228.
No. 798 discloses a reflection type image forming optical system, an example of which is shown in FIG. As shown in FIG. 6, this imaging optical system 1 has a first reflecting mirror 3a having a free-form curved surface with a concave surface facing the image forming element 2, and a convex surface facing the light flux from the first reflecting mirror 3a. A second reflecting mirror 3b having a free-form surface shape, a third reflecting mirror 3c having a free-form surface with a convex surface facing the light beam from the second reflecting mirror 3b, and a concave surface facing a light beam from the third reflecting mirror 3c Fourth reflecting mirror 3 having rotationally symmetric aspherical shape
The illumination optical system 4 for illuminating the image forming element 2 is constituted by a lamp 5.
【０００５】[0005]
【発明が解決しようとする課題】しかし、このような構
成を適用すると、結像光学系１を構成する反射面に自由
曲面形状を有する第３反射鏡３ｃを利用する必要がある
ため、製造上の精度および装置への組込精度が比較的厳
しい状況であった。However, if such a configuration is applied, it is necessary to use the third reflecting mirror 3c having a free-form curved surface as the reflecting surface that constitutes the imaging optical system 1, which is a problem in manufacturing. There was a relatively strict situation regarding the accuracy of and the accuracy of incorporation into the device.
【０００６】また、ＤＭＤを画像形成素子２として利用
した画像形成装置の場合では、画像形成素子２上の多数
の微小ミラーの姿勢をディジタル制御し、ランプ５から
照射される光束の一部を結像光学系１の光路に導くと共
に光束の他部を結像光学系１の光路から外すことによっ
て結像光学系１に導かれる光束に明暗を形成して画像を
生成することになるが、本来であれば結像光学系１の光
路から外されるべき光束の一部が迷走光となって結像光
学系１に侵入する場合があり、光線のカブリによって画
像コントラストの低下が生じ易くなるといった不都合が
発生する問題がある。Further, in the case of the image forming apparatus using the DMD as the image forming element 2, the postures of many micro mirrors on the image forming element 2 are digitally controlled so that a part of the luminous flux emitted from the lamp 5 is combined. By guiding the light beam to the optical path of the image optical system 1 and removing the other part of the light beam from the optical path of the imaging optical system 1, light and dark are formed in the light beam guided to the imaging optical system 1 to generate an image. In that case, a part of the light beam that should be removed from the optical path of the imaging optical system 1 may enter the imaging optical system 1 as stray light, and the fog of the light rays easily causes a decrease in image contrast. There is a problem that inconvenience occurs.
【０００７】[0007]
【発明の目的】そこで、本発明の目的は、前記従来技術
の不都合を解消し、小型で画角が広く画面上下方向の照
度の均一性が高く、ＤＭＤを画像形成素子として利用す
る場合に生じる画像コントラストの低下を防止すること
のできる安価な画像形成装置を提供することにある。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned disadvantages of the prior art and to use the DMD as an image forming element because of its small size, wide angle of view and high uniformity of illuminance in the vertical direction of the screen. An object of the present invention is to provide an inexpensive image forming apparatus capable of preventing a decrease in image contrast.
【０００８】[0008]
【課題を解決するための手段】本発明は、基板上に配設
された多数の微小ミラーの姿勢をディジタル制御し、光
源から基板に照射される光束の一部を結像光学系の光路
に導くと共に光束の他部を結像光学系の光路から外すこ
とにより結像光学系に導かれる光束に明暗を形成して画
像を生成する反射型画像形成素子を備えた画像形成装置
であり、前記目的を達成するため、特に、前記結像光学
系が、反射型画像形成素子に凹面を向けた回転対称非球
面形状を有する第１反射鏡と、第１反射鏡に凸面を向け
た回転対称非球面形状を有する第２反射鏡と、第２反射
鏡に凹面を向けた回転対称非球面形状を有する第３反射
鏡と、第３反射鏡に凸面を向けた回転対称非球面形状を
有する第４反射鏡とを備え、第１反射鏡と第２反射鏡と
の間に、反射型画像形成素子によって光路から外された
光束の光路侵入を防止する絞りが設けられていることを
特徴とする構成を有する。According to the present invention, the postures of a large number of minute mirrors arranged on a substrate are digitally controlled so that a part of the light beam emitted from the light source to the substrate is directed to the optical path of the imaging optical system. An image forming apparatus including a reflection-type image forming element for forming an image by forming light and darkness on a light beam guided to an imaging optical system by guiding the other part of the light beam from the optical path of the imaging optical system, In order to achieve the object, in particular, the imaging optical system has a first reflecting mirror having a rotationally symmetric aspherical surface with a concave surface facing the reflective image-forming element, and a rotationally symmetric non-spherical surface having a convex surface facing the first reflecting mirror. A second reflecting mirror having a spherical shape, a third reflecting mirror having a rotationally symmetric aspherical surface with a concave surface facing the second reflecting mirror, and a fourth reflecting mirror having a rotationally symmetric aspherical surface with a convex surface facing the third reflecting mirror. A reflection mirror, and a reflection type image between the first reflection mirror and the second reflection mirror. Having the structure, wherein a stop which prevents the optical path entering the light beam was removed from the optical path is provided by the forming element.
【０００９】基板上で姿勢をディジタル制御される多数
の微小ミラーに光源からの光束が照射され、明部に相当
する状態、要するに、出射光が結像光学系に向かう状態
に姿勢制御された微小ミラーからの反射光が結像光学系
の光路に導かれ、また、これとは逆に、暗部に相当する
状態、つまり、出射光が結像光学系に侵入しない状態に
姿勢制御された微小ミラーからの反射光が結像光学系の
光路から外される。この結果、結像光学系に向かう光束
の断面に画像となる明暗が形成される。この際、結像光
学系の光路から外されるべき光束の一部が暗部に相当す
る状態に姿勢制御された微小ミラーにより反射されて迷
走光となり、結像光学系の入射部である第１反射鏡に照
射される場合がある。従って、第１反射鏡から第２反射
鏡に照射される光束は、画像形成に必要とされる明部の
情報を含んだ光束とカブリの原因となる迷走光とを含ん
だものとなるが、第１反射鏡に対する光束の入射角は、
明部を形成する光束の入射角と迷走光の入射角とで相違
があるため、不適な角度で入射した迷走光の反射は、第
１反射鏡と第２反射鏡との間に設けられた絞りによって
遮られ、第２反射鏡には到達しない。その後、第２反射
鏡に照射された光束は第３反射鏡と第４反射鏡を経て拡
大され、最終的にスクリーン等に投影されるが、第１反
射鏡と第２反射鏡との間に設けられた絞りによって迷走
光の侵入による光束のカブリが除去されているので高コ
ントラストの画像を得ることができる。更に、第３反射
鏡を含め、全ての反射鏡が回転対称非球面形状の凹面鏡
あるいは凸面鏡によって構成されているので、自由曲面
形状を有する反射鏡を利用した場合と比べ、製造上の精
度や装置への組込精度が緩和されて装置の製造コストが
軽減される。A large number of minute mirrors whose postures are digitally controlled on the substrate are irradiated with a light beam from a light source, and the postures thereof are controlled to a state corresponding to a bright portion, that is, a state in which outgoing light is directed to an imaging optical system. The reflected light from the mirror is guided to the optical path of the imaging optical system, and, conversely, the micro mirror whose attitude is controlled so as to correspond to the dark part, that is, the state where the emitted light does not enter the imaging optical system. The reflected light from is removed from the optical path of the imaging optical system. As a result, an image of light and dark is formed on the cross section of the light beam that is directed to the imaging optical system. At this time, a part of the light beam to be removed from the optical path of the imaging optical system is reflected by a micromirror whose posture is controlled to a state corresponding to a dark portion and becomes stray light, which is the first portion which is an incident portion of the imaging optical system. The reflector may be illuminated. Therefore, the light flux emitted from the first reflecting mirror to the second reflecting mirror includes the light flux containing the information on the bright portion necessary for image formation and the stray light causing fog, The angle of incidence of the light beam on the first reflecting mirror is
Since there is a difference between the incident angle of the light flux forming the bright part and the incident angle of the stray light, reflection of the stray light incident at an inappropriate angle is provided between the first reflecting mirror and the second reflecting mirror. It is blocked by the diaphragm and does not reach the second reflecting mirror. After that, the light flux irradiated to the second reflecting mirror is expanded through the third reflecting mirror and the fourth reflecting mirror, and finally projected on the screen or the like, but between the first reflecting mirror and the second reflecting mirror. Since the fogging of the light flux due to the invasion of the stray light is removed by the provided diaphragm, a high-contrast image can be obtained. Further, since all the reflecting mirrors, including the third reflecting mirror, are composed of the rotationally symmetric aspherical concave or convex mirrors, the manufacturing precision and the apparatus can be improved as compared with the case of using the free curved surface reflecting mirrors. The accuracy of incorporation into the device is relaxed and the manufacturing cost of the device is reduced.
【００１０】また、前述の絞りは第１反射鏡と第２反射
鏡との間において主光線が交叉する位置に設けることが
望ましい。Further, it is desirable that the diaphragm is provided at a position where the principal rays intersect between the first reflecting mirror and the second reflecting mirror.
【００１１】迷走光の除去に好適な位置であり、また、
反射型画像形成素子から第１反射鏡に至る光路からも第
２反射鏡から第３反射鏡に至る光路からも共に離れた位
置となるので、絞りの設置によるケラレの発生を防止で
きる点で有利である。It is a position suitable for removing stray light, and
Since it is located away from both the optical path from the reflective image forming element to the first reflecting mirror and the optical path from the second reflecting mirror to the third reflecting mirror, it is advantageous in that vignetting can be prevented due to the installation of the diaphragm. Is.
【００１２】また、この絞りを透明な平面ガラス基板上
に形成された遮光部によって構成し、光源と反射型画像
形成素子および第１反射鏡をガラス基板によって第２，
第３，第４反射鏡と分離して密閉するようにしてもよ
い。Further, the diaphragm is constituted by a light shielding portion formed on a transparent flat glass substrate, and the light source, the reflection type image forming element and the first reflecting mirror are formed by the glass substrate.
You may make it separate from the 3rd and 4th reflecting mirrors, and may be hermetically sealed.
【００１３】絞りを形成した平面ガラス基板を利用して
反射型画像形成素子を密閉することにより、ゴミや埃の
侵入による画像の悪化を防止することができる。By sealing the reflection type image forming element using a flat glass substrate having a diaphragm, it is possible to prevent deterioration of an image due to intrusion of dust and dirt.
【００１４】更に、この絞りは第１反射鏡から第２反射
鏡に至る主光路に対して直交して設けることが望まし
い。Further, it is desirable that this diaphragm be provided orthogonal to the main optical path from the first reflecting mirror to the second reflecting mirror.
【００１５】これにより、実質的に光学系の一部として
機能する平面ガラス基板が光学系に及ぼす非点収差等の
悪影響が防止される。As a result, adverse effects such as astigmatism exerted on the optical system by the flat glass substrate that substantially functions as a part of the optical system are prevented.
【００１６】[0016]
【発明の実施の形態】以下、図面を参照して本発明の実
施形態について説明する。図１は本発明を適用した一実
施形態の画像形成装置の内部構造について示した側面
図、図２は図１の画像形成装置を右側から示した正面
図、図３は図２の画像形成装置を上方から示した上面図
であり、何れも光学系を構成する部品の位置関係を概念
的に示した図である。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 is a side view showing an internal structure of an image forming apparatus according to an embodiment of the present invention, FIG. 2 is a front view showing the image forming apparatus of FIG. 1 from the right side, and FIG. 3 is an image forming apparatus of FIG. FIG. 3 is a top view showing the above from above, each of which is a view conceptually showing the positional relationship of the components forming the optical system.
【００１７】図１に示されるように、この実施形態の画
像形成装置は、ＤＭＤ（Digital Micromirror Device
〔テキサス・インスツルメント社 商標〕）によって構
成される反射型画像形成素子６を有し、この反射型画像
形成素子６を照射するための照明光学系７と、反射型画
像形成素子６によって反射された光束を受け入れて拡大
する結像光学系８とを備える。As shown in FIG. 1, the image forming apparatus of this embodiment is a DMD (Digital Micromirror Device).
[Texas Instruments Co., Ltd.]), and an illumination optical system 7 for irradiating the reflection type image forming element 6 and a reflection type image forming element 6 An image forming optical system 8 for receiving and expanding the formed light flux.
【００１８】照明光学系７は、図２および図３に示され
るように、光源としてのアーク１１ａおよび楕円ミラー
１１ｂからなるランプ１１と、ロッドレンズ１２および
レンズ１３，１４，１５，１６と平面反射鏡１７によっ
て構成され、ランプ１１のアーク１１aより発せられた
光束を楕円ミラー１１ｂでロッドレンズ１２の入射側開
口１２ａに集光させ、レンズ１３，１４，１５，１６と
平面反射鏡１７とを介し、ロッドレンズ１２の出射端１
２ｂの照度分布をその形状と共に反射型画像形成素子６
に拡大照射するようになっている。As shown in FIGS. 2 and 3, the illumination optical system 7 includes a lamp 11 including an arc 11a as a light source and an elliptical mirror 11b, a rod lens 12, lenses 13, 14, 15, 16 and a plane reflection. The light flux emitted from the arc 11a of the lamp 11 is focused on the entrance side opening 12a of the rod lens 12 by the elliptical mirror 11b, and is passed through the lenses 13, 14, 15, 16 and the plane reflecting mirror 17 , Output end 1 of rod lens 12
The illuminance distribution of 2b together with the shape of the reflection type image forming element 6
It is designed to irradiate with expanded light.
【００１９】この反射型画像形成素子６を構成するＤＭ
Ｄは、その基板上に配設された多数の微小ミラーの姿勢
をディジタル制御し、照明光学系７から基板に照射され
る光束の一部を結像光学系８の光路に導く一方、照明光
学系７から照射される光束の他部を結像光学系８の光路
から外すことにより結像光学系８に導かれる光束に明暗
を形成して画像を生成する反射型画像形成素子である。DM constituting the reflection type image forming element 6
D digitally controls the postures of a large number of minute mirrors arranged on the substrate, guides a part of the light flux irradiated from the illumination optical system 7 to the substrate to the optical path of the imaging optical system 8, and the illumination optical system. This is a reflection-type image forming element that forms an image by forming light and dark in the light beam guided to the imaging optical system 8 by removing the other part of the light beam emitted from the system 7 from the optical path of the imaging optical system 8.
【００２０】具体的には、反射型画像形成素子６を構成
するＤＭＤの基板上には約５０万個〜１３０万個ほどの
微小ミラーが実装され、その各々が、ＤＭＤを駆動制御
するマイクロプロセッサによって例えば±１０°の範囲
で傾斜するように姿勢制御され、＋１０°に姿勢制御さ
れた微小ミラーによって反射された光束が第１反射鏡９
ａを入射部とする結像光学系８の光路に侵入して画像の
明部を形成し、また、−１０°に姿勢制御された微小ミ
ラーによって反射された光束の大半は、結像光学系８の
第１反射鏡９ａに入射しない方向に進路をずらされる。Specifically, about 500,000 to 1.3 million micromirrors are mounted on the substrate of the DMD constituting the reflection type image forming element 6, and each of them has a microprocessor for driving and controlling the DMD. Is controlled so as to be tilted within a range of ± 10 ° by, for example, the light flux reflected by the minute mirror whose posture is controlled at + 10 ° is reflected by the first reflecting mirror 9.
Most of the light flux that enters the optical path of the imaging optical system 8 having a as an incident portion to form a bright portion of the image and is reflected by the micromirror whose attitude is controlled at −10 ° is the imaging optical system. 8 is shifted in the direction in which the first reflecting mirror 9a does not enter.
【００２１】つまり、＋１０°に姿勢制御された微小ミ
ラーの部分が最終画像における白色部分であり、また、
−１０°に姿勢制御された微小ミラーの部分が最終画像
における黒色部分である。このようにして多数のミラー
の姿勢制御によって画像を形成する際、−１０°に姿勢
制御された微小ミラーによって反射された光束の一部が
迷走して第１反射鏡９ａを始めとする結像光学系８の光
路に侵入する場合があり、図６に示されるような従来の
結像光学系１では、この迷走光がカブリとなって画像の
コントラストの低下を招いていた。That is, the portion of the micro mirror whose attitude is controlled to + 10 ° is the white portion in the final image, and
The portion of the micro mirror whose posture is controlled at −10 ° is the black portion in the final image. In this way, when an image is formed by controlling the attitude of a large number of mirrors, a part of the light flux reflected by the minute mirrors whose attitude is controlled at −10 ° strays and forms an image including the first reflecting mirror 9a. In some cases, the stray light may enter the optical path of the optical system 8, and the stray light causes fog in the conventional imaging optical system 1 as shown in FIG.
【００２２】本実施形態の場合、反射型画像形成素子６
上で＋１０°に姿勢制御された微小ミラーからの反射光
を受ける結像光学系８は、図１に示される通り、反射型
画像形成素子６に凹面を向けた回転対称非球面形状を有
する第１反射鏡９ａと、第１反射鏡９ａに凸面を向けた
回転対称非球面形状を有する第２反射鏡９ｂと、第２反
射鏡９ｂに凹面を向けた回転対称非球面形状を有する第
３反射鏡９ｃと、第３反射鏡９ｃに凸面を向けた回転対
称非球面形状を有する第４反射鏡９ｄとによって構成さ
れる。In the case of this embodiment, the reflection type image forming element 6 is used.
As shown in FIG. 1, the imaging optical system 8 that receives the reflected light from the minute mirror whose attitude is controlled to + 10 ° above has a rotationally symmetric aspherical surface with a concave surface facing the reflective image forming element 6. A first reflecting mirror 9a, a second reflecting mirror 9b having a rotationally symmetric aspherical shape with a convex surface facing the first reflecting mirror 9a, and a third reflecting mirror having a rotationally symmetric aspherical surface with a concave surface facing the second reflecting mirror 9b. It is composed of a mirror 9c and a fourth reflecting mirror 9d having a rotationally symmetric aspherical shape with a convex surface facing the third reflecting mirror 9c.
【００２３】つまり、図６に示した従来例の結像光学系
１と比較すると、凸面の自由曲面形状を有する第３反射
鏡３ｃに代えて凹面の回転対称非球面形状を有する第３
反射鏡９ｃを用い、更に、凹面の回転対称非球面形状を
有する第４反射鏡３ｄに代えて凸面の回転対称非球面形
状を有する第４反射鏡９ｄを用いている点が相違する。That is, as compared with the conventional imaging optical system 1 shown in FIG. 6, the third reflecting mirror 3c having a convex free-form surface is replaced with a concave rotationally symmetric aspherical surface.
The difference is that the reflecting mirror 9c is used, and the fourth reflecting mirror 9d having a convex rotationally symmetric aspherical shape is used instead of the fourth reflecting mirror 3d having a concave rotationally symmetric aspherical shape.
【００２４】凸面の自由曲面形状を有する第３反射鏡３
ｃに比べ、凹面の回転対称非球面形状を有する第３反射
鏡９ｃの方が製造上の精度や装置への組込精度が緩和さ
れるので、このようにして凹面の回転対称非球面形状を
有する第３反射鏡９ｃを適用することにより、装置の製
造コストが軽減されといったメリットがある。Third reflecting mirror 3 having a convex free-form surface
Compared with c, the third reflecting mirror 9c having a concave rotationally symmetric aspherical shape can be more relaxed in manufacturing precision and assembling accuracy in the apparatus. By applying the third reflecting mirror 9c that it has, there is an advantage that the manufacturing cost of the device is reduced.
【００２５】一方、凸面の第３反射鏡３ｃに代えて凹面
の第３反射鏡９ｃを利用しているため、第３反射鏡９ｃ
による画像の拡大率は第３反射鏡３ｃによる画像の拡大
率に比べて劣るが、同時に、凹面の第４反射鏡３ｄに代
えて凸面の第４反射鏡９ｄを利用しているので、最終的
な画像の拡大率は図６の従来例に比べて遜色がなく、従
来と同等の広画角化と装置の小型化が達成されている。On the other hand, since the third reflecting mirror 3c having a concave surface is used instead of the third reflecting mirror 3c having a convex surface, the third reflecting mirror 9c is used.
The image enlargement ratio by the third reflecting mirror 3c is inferior to the image enlargement ratio by the third reflecting mirror 3c, but at the same time, the convex fourth reflecting mirror 9d is used instead of the concave fourth reflecting mirror 3d. The image enlargement ratio is comparable to that of the conventional example shown in FIG. 6, and the wide angle of view and the miniaturization of the device, which are equivalent to those of the conventional example, are achieved.
【００２６】なお、各反射鏡の自由曲面形状は、例え
ば、面の深さをＺ，円錐常数をｋ，光軸頂点での曲率を
ｃ，光軸からの高さをρ，補正係数をαｉ（ｉ＝１，
２，・・・，７，８），光軸頂点での曲率半径をｒ，深
さＺに直交する方向の座標の値をｘ，ｙとして、数１の
式で示されるものを適用することができる。The free-form surface of each reflecting mirror has, for example, a surface depth of Z, a cone constant of k, a curvature at the optical axis apex of c, a height from the optical axis of ρ, and a correction coefficient of α. i (i = 1,
2, ..., 7, 8), the radius of curvature at the apex of the optical axis is r, and the values of coordinates in the direction orthogonal to the depth Z are x and y, and the one expressed by the formula 1 is applied. You can
【００２７】[0027]
【数１】 [Equation 1]
【００２８】更に、第１反射鏡９ａと第２反射鏡９ｂと
の間で主光線が交叉する位置（第１反射鏡９ａの焦点位
置）には、主光線と直交するようにして本実施形態に固
有の絞り１０が設けられている。絞り１０の周辺構造を
拡大して図４に示す。Further, at the position where the chief ray intersects between the first reflecting mirror 9a and the second reflecting mirror 9b (the focal position of the first reflecting mirror 9a), it is arranged so as to be orthogonal to the principal ray. Is provided with a diaphragm 10. The peripheral structure of the diaphragm 10 is enlarged and shown in FIG.
【００２９】この絞り１０は、反射型画像形成素子６上
で明部となる＋１０°の位置に姿勢制御された微小ミラ
ーで反射されて第１反射鏡９ａに照射された光束の反射
光が第２反射鏡９ｂに向かうことは妨げないが、反射型
画像形成素子６上で暗部となる−１０°の位置に姿勢制
御された微小ミラーから第１反射鏡９ａに迷走した光束
が第１反射鏡９ａで反射されて生じた光束は、その光路
が絞り１０の内径から径方向外側に外れるため、この迷
走光が第２反射鏡９ｂに入ることを阻止（遮光）する。The diaphragm 10 reflects the reflected light of the light beam which is reflected by the fine mirror whose attitude is controlled to a position of + 10 ° which is a bright portion on the reflection type image forming element 6 and which is irradiated on the first reflecting mirror 9a. Although it does not prevent the light beam from going to the second reflecting mirror 9b, the light flux straying from the fine mirror whose attitude is controlled to a position of −10 ° which is a dark portion on the reflective image forming element 6 to the first reflecting mirror 9a is the first reflecting mirror. Since the optical path of the light beam reflected by 9a deviates from the inner diameter of the diaphragm 10 to the outer side in the radial direction, the stray light is blocked (shielded) from entering the second reflecting mirror 9b.
【００３０】このようにして迷走光が除去される結果、
第２反射鏡９ｂに入射される光束は、反射型画像形成素
子６上で明部となる＋１０°の位置に姿勢制御された微
小ミラーで反射された光のみに制限され（他部は完全な
暗部）、これまでに問題となっていた迷走光の侵入によ
るカブリの影響が除去され、第４反射鏡９ｄからの最終
的な出力光によってスクリーン（図示せず）上に投影さ
れる画像において、明快なコントラストを得ることが可
能となる。As a result of eliminating stray light in this way,
The light flux incident on the second reflecting mirror 9b is limited to only the light reflected by the fine mirror whose attitude is controlled to the position of + 10 ° which is the bright portion on the reflection type image forming element 6 (the other portions are completely In the image projected on the screen (not shown) by the final output light from the fourth reflecting mirror 9d, the influence of fogging due to the invasion of the stray light, which has been a problem so far, is eliminated. It is possible to obtain clear contrast.
【００３１】また、絞り１０は第１反射鏡９ａと第２反
射鏡９ｂとの間の略中央に位置する主光線の交叉位置に
設けられているので、反射型画像形成素子６から第１反
射鏡９ａに至る光路に絞り１０の外周部分が突出した
り、第２反射鏡９ｂから第３反射鏡９ｃに至る光路に絞
り１０の外周部分が突出したりすることがなく、絞り１
０の設置によるケラレの発生を未然に防止することがで
きる。Further, since the diaphragm 10 is provided at the intersection of the principal rays located substantially in the center between the first reflecting mirror 9a and the second reflecting mirror 9b, the first reflection from the reflection type image forming element 6 is performed. The outer peripheral portion of the diaphragm 10 does not project in the optical path to the mirror 9a, and the outer peripheral portion of the diaphragm 10 does not project in the optical path from the second reflecting mirror 9b to the third reflecting mirror 9c.
Vignetting due to the setting of 0 can be prevented in advance.
【００３２】図５は本発明の画像形成装置をリアプロジ
ェクターに適用した場合の一実施形態について簡略化し
て示した図である。ランプ１１等を備えた照明光学系７
の配列、ＤＭＤからなる反射型画像形成素子６の構成、
および、第１反射鏡９ａ，第２反射鏡９ｂ，第３反射鏡
９ｃ，第４反射鏡９ｄからなる結像光学系８の配列に関
しては図１〜図３を参照して説明した前述の実施形態と
実質的に同一であるが、第１反射鏡９ａと第２反射鏡９
ｂとの間の絞り１０’が透明な平面ガラス基板上の遮光
部によって構成され、この平面ガラス基板と光源用筐体
２１とによって、照明光学系７と反射型画像形成素子６
および第１反射鏡９ａが、第２反射鏡９ｂ，第３反射鏡
９ｃ，第４反射鏡９ｄと分離して光源用筐体２１内に密
閉して配備されている点が前述の実施形態とは相違す
る。FIG. 5 is a simplified view of an embodiment in which the image forming apparatus of the present invention is applied to a rear projector. Illumination optical system 7 including lamp 11 and the like
Array, the configuration of the reflective image forming element 6 including DMD,
Also, regarding the arrangement of the imaging optical system 8 including the first reflecting mirror 9a, the second reflecting mirror 9b, the third reflecting mirror 9c, and the fourth reflecting mirror 9d, the above-described embodiment described with reference to FIGS. Although substantially the same in form, the first reflecting mirror 9a and the second reflecting mirror 9
A diaphragm 10 ′ between the diaphragm 10 b and the transparent glass substrate is constituted by a light-shielding portion on a transparent flat glass substrate, and the illumination optical system 7 and the reflection-type image forming element 6 are formed by the flat glass substrate and the light source housing 21.
In addition, the first reflecting mirror 9a is separated from the second reflecting mirror 9b, the third reflecting mirror 9c, and the fourth reflecting mirror 9d and hermetically arranged in the light source housing 21, as compared with the above-described embodiment. Is different.
【００３３】つまり、図５の実施形態では、照明光学系
７，反射型画像形成素子６，第１反射鏡９ａが、光源用
筐体２１と該光源用筐体２１の一部を形成する前述の平
面ガラス基板とによって完全に外部から密閉された構造
であり、反射型画像形成素子６に対するゴミや埃の付着
による画像の悪化を防止することができる。That is, in the embodiment shown in FIG. 5, the illumination optical system 7, the reflective image forming element 6, and the first reflecting mirror 9a form the light source housing 21 and a part of the light source housing 21. Since the structure is completely sealed from the outside by the flat glass substrate, it is possible to prevent the deterioration of the image due to the adhesion of dust or dust to the reflective image forming element 6.
【００３４】この際、平面ガラス基板の素通し部分であ
る絞り１０’の内側部分が、第１反射鏡９ａと第２反射
鏡９ｂとの間で実質的な光学系の一部として機能する
が、このガラス基板は精度の高い平面ガラスで形成さ
れ、しかも、第１反射鏡９ａから第２反射鏡９ｂに至る
主光路に対して直交して設置されているので、非点収差
や内面反射等の悪影響は最小限に抑制することができ
る。At this time, the inner portion of the diaphragm 10 ', which is a transparent portion of the flat glass substrate, functions as a substantial part of the optical system between the first reflecting mirror 9a and the second reflecting mirror 9b. Since this glass substrate is formed of highly accurate flat glass and is installed orthogonally to the main optical path from the first reflecting mirror 9a to the second reflecting mirror 9b, there is no astigmatism or internal reflection. Adverse effects can be minimized.
【００３５】平面反射鏡１８，１９は結像光学系８の第
４反射鏡９ｄから出力された光束を反射させてスクーン
２０上に投射するためのもので、全体の光路を折り畳む
ことにより、リアプロジェクターをコンパクトに構成す
るように配列されている。The plane reflecting mirrors 18 and 19 are for reflecting the light beam output from the fourth reflecting mirror 9d of the image forming optical system 8 and projecting it onto the scoop 20. By folding the entire optical path, rear Arranged to make the projector compact.
【００３６】[0036]
【発明の効果】本発明の画像形成装置は、反射型画像形
成素子の画像をスクリーン上に結像させるための結像光
学系を構成する反射鏡の全てを回転対称非球面形状の凹
面鏡と凸面鏡とで構成しているので、自由曲面形状を有
する反射鏡を利用した場合と比べ、製造上の精度や装置
への組込精度が緩和されて装置の製造コストが軽減され
る。更に、第１反射鏡と第２反射鏡との間には反射型画
像形成素子によって光路から外された光束の光路侵入を
防止するための絞りを設けているので、反射型画像形成
素子からの反射光のうち本来は結像光学系の光路から外
されるべき光束の一部が迷走光となって結像光学系の入
射部に侵入した場合であっても、この迷走光を第１反射
鏡と第２反射鏡との間で除去することができ、反射型画
像形成素子を利用した画像形成装置、特に、ＤＭＤ（Di
gital Micromirror Device）を利用した画像形成装置に
おいて、カブリのない高コントラストの画像を得ること
ができる。According to the image forming apparatus of the present invention, all of the reflecting mirrors constituting the image forming optical system for forming the image of the reflection type image forming element on the screen are a rotationally symmetric aspherical concave mirror and a convex mirror. Therefore, compared with the case where a reflecting mirror having a free-form surface shape is used, the manufacturing precision and the mounting precision in the device are relaxed, and the manufacturing cost of the device is reduced. Further, since a diaphragm is provided between the first reflecting mirror and the second reflecting mirror to prevent an optical path of a light beam deviated from the optical path by the reflection type image forming element from being provided, the reflection type image forming element is prevented from entering the diaphragm. Even if a part of the light beam that should originally be removed from the optical path of the imaging optical system becomes stray light and enters the entrance portion of the imaging optical system, this stray light is first reflected. An image forming apparatus that can be removed between the mirror and the second reflecting mirror and uses a reflection type image forming element, especially DMD (Di
An image forming apparatus using a gital Micromirror Device) can obtain a high-contrast image without fog.
【００３７】また、迷走光除去用の絞りは第１反射鏡と
第２反射鏡との間において主光線が交叉する位置に設け
るようにしているので、反射型画像形成素子から第１反
射鏡に至る光路や第２反射鏡から第３反射鏡に至る光路
に絞りの構成要素が突出することはなく、絞りの設置に
よるケラレの発生を容易に防止することができる。Further, since the diaphragm for removing the stray light is arranged at the position where the principal ray intersects between the first reflecting mirror and the second reflecting mirror, the reflection type image forming element is changed to the first reflecting mirror. Since the constituent elements of the diaphragm do not project in the optical path that reaches the optical path and the optical path that extends from the second reflecting mirror to the third reflecting mirror, it is possible to easily prevent the occurrence of vignetting due to the installation of the diaphragm.
【００３８】更に、この絞りを透明な平面ガラス基板上
に形成された遮光部によって構成し、光源と反射型画像
形成素子および第１反射鏡をガラス基板によって第２，
第３，第４反射鏡と分離して密閉するようにしているた
め、反射型画像形成素子へのゴミや埃の侵入あるいは付
着による画像の悪化を防止することができる。Further, the diaphragm is constituted by a light-shielding portion formed on a transparent flat glass substrate, and the light source, the reflection type image forming element and the first reflecting mirror are formed by the glass substrate.
Since the third and fourth reflecting mirrors are separated and hermetically sealed, it is possible to prevent deterioration of the image due to intrusion or adhesion of dust or dirt to the reflective image forming element.
【００３９】しかも、第１反射鏡から第２反射鏡に至る
主光路に対して直交させて絞りを設けるようにしている
ので、光学系に平面ガラス基板を挿入することによって
生じる非点収差や内面反射等の悪影響を最小限に抑制す
ることができる。Moreover, since the stop is provided so as to be orthogonal to the main optical path from the first reflecting mirror to the second reflecting mirror, the astigmatism and inner surface caused by inserting the flat glass substrate into the optical system. It is possible to minimize adverse effects such as reflection.
【図１】本発明を適用した一実施形態の画像形成装置の
内部構造について主要な部品の配列を示した側面図であ
る。FIG. 1 is a side view showing an arrangement of main components in an internal structure of an image forming apparatus according to an embodiment of the present invention.
【図２】同実施形態の画像形成装置の内部構造について
主要な部品の配列を示した正面図である。FIG. 2 is a front view showing an arrangement of main components of the internal structure of the image forming apparatus of the embodiment.
【図３】同実施形態の画像形成装置の内部構造について
主要な部品の配列を示した上面図である。FIG. 3 is a top view showing an arrangement of main components in the internal structure of the image forming apparatus of the embodiment.
【図４】絞りの周辺構造を拡大して示した図である。FIG. 4 is an enlarged view showing a peripheral structure of a diaphragm.
【図５】本発明を適用したリアプロジェクターの一実施
形態について簡略化して示した図である。FIG. 5 is a simplified view of an embodiment of a rear projector to which the present invention is applied.
【図６】従来の反射型結像光学系の一例を示した概念図
である。FIG. 6 is a conceptual diagram showing an example of a conventional reflective imaging optical system.
１ 結像光学系 ２ 画像形成素子 ３ａ 第１反射鏡 ３ｂ 第２反射鏡 ３ｃ 第３反射鏡 ３ｄ 第４反射鏡 ４ 照明光学系 ５ ランプ ６ 反射型画像形成素子（ＤＭＤ） ７ 照明光学系 ８ 結像光学系 ９ａ 第１反射鏡 ９ｂ 第２反射鏡 ９ｃ 第３反射鏡 ９ｄ 第４反射鏡 １０，１０’ 絞り １１ ランプ １１ａ アーク（光源） １１ｂ 楕円ミラー １２ ロッドレンズ １２ａ 入射側開口 １２ｂ 出射端 １３，１４，１５，１６ レンズ １７，１８，１９ 平面反射鏡 ２０ スクリーン ２１ 光源用筐体 1 Imaging optical system 2 Image forming element 3a First reflector 3b Second reflector 3c Third reflector 3d 4th reflector 4 Illumination optical system 5 lamps 6 Reflective image forming device (DMD) 7 Illumination optical system 8 Imaging optical system 9a First reflector 9b Second reflector 9c Third reflector 9d 4th reflector 10, 10 'diaphragm 11 lamps 11a arc (light source) 11b elliptical mirror 12 rod lens 12a Entrance side aperture 12b exit end 13,14,15,16 lens 17, 18, 19 Plane reflector 20 screen 21 Light source housing
Claims (4)
姿勢をディジタル制御し、光源から前記基板に照射され
る光束の一部を結像光学系の光路に導くと共に前記光束
の他部を前記結像光学系の光路から外すことにより前記
結像光学系に導かれる光束に明暗を形成して画像を生成
する反射型画像形成素子を備えた画像形成装置であっ
て、 前記結像光学系が、前記反射型画像形成素子に凹面を向
けた回転対称非球面形状を有する第１反射鏡と、第１反
射鏡に凸面を向けた回転対称非球面形状を有する第２反
射鏡と、第２反射鏡に凹面を向けた回転対称非球面形状
を有する第３反射鏡と、第３反射鏡に凸面を向けた回転
対称非球面形状を有する第４反射鏡とを備え、前記第１
反射鏡と前記第２反射鏡との間に、前記反射型画像形成
素子によって前記光路から外された光束の光路侵入を防
止する絞りが設けられていることを特徴とする画像形成
装置。1. The postures of a large number of minute mirrors arranged on a substrate are digitally controlled to guide a part of a light beam emitted from a light source to the substrate to an optical path of an image forming optical system, and the other part of the light beam. An image forming apparatus including a reflection-type image forming element that forms an image by forming light and dark in a light beam guided to the image forming optical system by removing the image forming optical system from the optical path of the image forming optical system. A system has a first reflecting mirror having a rotationally symmetric aspherical shape with a concave surface facing the reflective image forming element, a second reflecting mirror having a rotationally symmetric aspherical surface having a convex surface facing the first reflecting mirror, and A third reflecting mirror having a rotationally symmetric aspherical shape with a concave surface facing the two reflecting mirrors; and a fourth reflecting mirror having a rotationally symmetric aspherical surface having a convex surface facing the third reflecting mirror,
An image forming apparatus, wherein a diaphragm is provided between a reflecting mirror and the second reflecting mirror to prevent an optical path of a light beam deviated from the optical path by the reflective image forming element from entering the optical path.
射鏡との間において主光線が交叉する位置に設けられて
いることを特徴とする請求項１記載の画像形成装置。2. The image forming apparatus according to claim 1, wherein the diaphragm is provided at a position where principal rays intersect between the first reflecting mirror and the second reflecting mirror.
成された遮光部によって構成され、前記光源と反射型画
像形成素子および第１反射鏡が、前記ガラス基板によっ
て前記第２，第３，第４反射鏡と分離して密閉されてい
ることを特徴とする請求項１または請求項２記載の画像
形成装置。3. The diaphragm is composed of a light-shielding portion formed on a transparent flat glass substrate, and the light source, the reflective image forming element and the first reflecting mirror are made of the glass substrate to form the second, third and third portions. The image forming apparatus according to claim 1, wherein the image forming apparatus is separated from the fourth reflecting mirror and hermetically sealed.
反射鏡に至る主光路に対して直交して設けられているこ
とを特徴とする請求項１，請求項２または請求項３記載
の画像形成装置。4. The diaphragm is arranged from the first reflecting mirror to the second reflecting mirror.
The image forming apparatus according to claim 1, wherein the image forming apparatus is provided so as to be orthogonal to a main optical path reaching the reflecting mirror.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001313695A JP3716200B2 (en) | 2001-10-11 | 2001-10-11 | Image forming apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001313695A JP3716200B2 (en) | 2001-10-11 | 2001-10-11 | Image forming apparatus |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2005169284A Division JP2005275433A (en) | 2005-06-09 | 2005-06-09 | Image forming apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003121783A true JP2003121783A (en) | 2003-04-23 |
| JP3716200B2 JP3716200B2 (en) | 2005-11-16 |
Family
ID=19132125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001313695A Expired - Fee Related JP3716200B2 (en) | 2001-10-11 | 2001-10-11 | Image forming apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3716200B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006047685A (en) * | 2004-08-04 | 2006-02-16 | Chinontec Kk | Projector apparatus |
| JP2006047684A (en) * | 2004-08-04 | 2006-02-16 | Chinontec Kk | Projector apparatus |
| JP2006284994A (en) * | 2005-04-01 | 2006-10-19 | Konica Minolta Opto Inc | Projection optical unit and projection type image display apparatus using same |
| JP2006284995A (en) * | 2005-04-01 | 2006-10-19 | Konica Minolta Opto Inc | Projection image display apparatus |
| WO2006129797A1 (en) * | 2005-06-03 | 2006-12-07 | Kuraray Co., Ltd. | Rear projection type display device |
| JP2007328130A (en) * | 2006-06-08 | 2007-12-20 | Hitachi Ltd | Projection type image display apparatus |
| WO2009119719A1 (en) * | 2008-03-28 | 2009-10-01 | 三洋電機株式会社 | Projection image display device |
| US7717573B2 (en) | 2005-04-11 | 2010-05-18 | Nec Viewtechnology, Ltd. | Projection display apparatus |
| US7854515B2 (en) | 2005-04-01 | 2010-12-21 | Konica Minolta Opto, Inc. | Projection type image display apparatus |
| JP2012053468A (en) * | 2011-09-20 | 2012-03-15 | Hitachi Ltd | Projection type image display apparatus |
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2001
- 2001-10-11 JP JP2001313695A patent/JP3716200B2/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006047685A (en) * | 2004-08-04 | 2006-02-16 | Chinontec Kk | Projector apparatus |
| JP2006047684A (en) * | 2004-08-04 | 2006-02-16 | Chinontec Kk | Projector apparatus |
| JP4648666B2 (en) * | 2004-08-04 | 2011-03-09 | 株式会社Ｓｕｗａオプトロニクス | Projector device |
| JP2006284994A (en) * | 2005-04-01 | 2006-10-19 | Konica Minolta Opto Inc | Projection optical unit and projection type image display apparatus using same |
| JP2006284995A (en) * | 2005-04-01 | 2006-10-19 | Konica Minolta Opto Inc | Projection image display apparatus |
| US7854515B2 (en) | 2005-04-01 | 2010-12-21 | Konica Minolta Opto, Inc. | Projection type image display apparatus |
| US7717573B2 (en) | 2005-04-11 | 2010-05-18 | Nec Viewtechnology, Ltd. | Projection display apparatus |
| WO2006129797A1 (en) * | 2005-06-03 | 2006-12-07 | Kuraray Co., Ltd. | Rear projection type display device |
| JP2007328130A (en) * | 2006-06-08 | 2007-12-20 | Hitachi Ltd | Projection type image display apparatus |
| WO2009119719A1 (en) * | 2008-03-28 | 2009-10-01 | 三洋電機株式会社 | Projection image display device |
| JP2009258701A (en) * | 2008-03-28 | 2009-11-05 | Sanyo Electric Co Ltd | Projection image display device |
| JP2012053468A (en) * | 2011-09-20 | 2012-03-15 | Hitachi Ltd | Projection type image display apparatus |
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|---|---|
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