JPH0645222A - Projection aligner - Google Patents

Projection aligner

Info

Publication number
JPH0645222A
JPH0645222A JP5155045A JP15504593A JPH0645222A JP H0645222 A JPH0645222 A JP H0645222A JP 5155045 A JP5155045 A JP 5155045A JP 15504593 A JP15504593 A JP 15504593A JP H0645222 A JPH0645222 A JP H0645222A
Authority
JP
Japan
Prior art keywords
light source
light
secondary light
optical system
aperture
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.)
Granted
Application number
JP5155045A
Other languages
Japanese (ja)
Other versions
JPH0746682B2 (en
Inventor
Tetsuo Kikuchi
哲男 菊池
Masahiro Nakagawa
正弘 中川
Koichi Matsumoto
宏一 松本
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.)
Nikon Corp
Original Assignee
Nikon Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nikon Corp filed Critical Nikon Corp
Priority to JP5155045A priority Critical patent/JPH0746682B2/en
Publication of JPH0645222A publication Critical patent/JPH0645222A/en
Publication of JPH0746682B2 publication Critical patent/JPH0746682B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03FPHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/70Microphotolithographic exposure; Apparatus therefor
    • G03F7/70058Mask illumination systems
    • G03F7/70091Illumination settings, i.e. intensity distribution in the pupil plane or angular distribution in the field plane; On-axis or off-axis settings, e.g. annular, dipole or quadrupole settings; Partial coherence control, i.e. sigma or numerical aperture [NA]

Abstract

PURPOSE:To provide a projection aligner wherein a quantity of light of an illumination optical system and a sigma value can be controlled separately by varying the diameters of two aperture diaphragms in combination for illuminating an object evenly using a collimated light source. CONSTITUTION:In a projection aligner which forms an image of a first object R illuminated by light from an illumination optical system on a second object W through a projection optical system 7, a light source 10 which supplies a collimated beam of light, a secondary light source forming device 1 which forms a plurality of secondary light sources 10a from the beam of light supplied from the light source 10, a tertiary light source forming device 4 which is located in a beam of light emitted from a secondary light source forming device and which further increases the secondary light sources, a first aperture diaphragm S. which is so structured as to vary its aperture diameter, and a second aperture diaphragm S2 which specifies the size of a plurality of tertiary light sources formed by the tertiary light source forming device and which can vary its aperture diameter are provided.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、IC等の半導体素子を
製造するための露光装置に関し、特にレーザーのような
コリメートされた光源を使って対象物を均一に照明する
ための照明用光学装置を備えた露光装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exposure apparatus for manufacturing a semiconductor element such as an IC, and more particularly to an illumination optical apparatus for uniformly illuminating an object using a collimated light source such as a laser. And an exposure apparatus having the same.

【0002】[0002]

【従来の技術】従来、IC等の半導体素子を製造するた
めの投影露光装置としては、例えば特開昭56−818
13号公報に開示されているように、楕円鏡と1個の多
数光源像形成手段としてのオプティカルインテグレータ
を用いたものや、また、照明の均一性をより高めるため
に特開昭58−147708号公報に開示される如く、
直列配置された2個のオプティカルインテグレータを用
いたものが知られている。
2. Description of the Related Art Conventionally, as a projection exposure apparatus for manufacturing semiconductor elements such as ICs, for example, Japanese Patent Laid-Open No. 56-818 has been proposed.
JP-A-58-147708, which uses an ellipsoidal mirror and an optical integrator as one multi-source image forming means, as disclosed in JP-A-13, and to further enhance the uniformity of illumination. As disclosed in the publication,
It is known to use two optical integrators arranged in series.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、上述の
如き投影露光装置においては、投影対物レンズのN.A.
(開口数)に対する照明光学系のN.A.の比の値であるσ
値と、照明光学系による光量の制御とを独立に行なうこ
とができなかった。そこで、本発明は、照明光学系の光
量の制御とσ値の制御とを独立に行なうことのできる投
影露光装置を提供することを目的とする。
However, in the projection exposure apparatus as described above, the NA of the projection objective lens is used.
Σ, which is the ratio of NA of the illumination optical system to (numerical aperture)
The value and the control of the light quantity by the illumination optical system could not be performed independently. Therefore, an object of the present invention is to provide a projection exposure apparatus capable of independently controlling the light amount of the illumination optical system and the σ value.

【0004】[0004]

【課題を解決するための手段】上述の目的を達成するた
めに、本発明による投影露光装置は、以下に示す構成を
有している。例えば図1に示す如く、照明光学系からの
光によって照明された第1の物体(R)の像を投影光学
系(7)を介して第2の物体(W)上に形成する投影露
光装置において、照明光学系は、コリメートされた光束
を供給する光源手段(10)と、この光源手段から供給
される光束から複数の2次光源(10a)を形成する2
次光源形成手段(1)と、2次光源形成手段からの射出
光束中に配置され、かつ複数の2次光源をさらに複数形
成する3次光源形成手段(4)と、2次光源形成手段に
よる複数の2次光源(10a)の大きさを規定し、かつ
開口径が可変に構成された第1の開口絞り(S1 )と、
3次光源形成手段による複数の3次光源の大きさを規定
し、かつ開口径が可変に構成された第2の開口絞り(S
2 )とを有するように構成される。
In order to achieve the above object, the projection exposure apparatus according to the present invention has the following structure. For example, as shown in FIG. 1, a projection exposure apparatus that forms an image of a first object (R) illuminated by light from an illumination optical system on a second object (W) via a projection optical system (7). In, the illumination optical system forms a plurality of secondary light sources (10a) from the light source means (10) for supplying the collimated light flux and the light flux supplied from this light source means.
The secondary light source forming unit (1), the tertiary light source forming unit (4) arranged in the light flux emitted from the secondary light source forming unit, and further forming a plurality of secondary light sources, and the secondary light source forming unit. A first aperture stop (S 1 ) that defines the sizes of a plurality of secondary light sources (10a) and has a variable aperture diameter;
A second aperture stop (S) that defines the sizes of the plurality of tertiary light sources by the tertiary light source forming means and has a variable aperture diameter.
2 ) and with.

【0005】[0005]

【作用】このような構成によれば、第2開口絞りS2
よってσ値が決定される。ここで、第1開口絞りS1
開口径を変化させると、σ値を一定に維持したまま被照
射物体に達する光量を制御することができる。また、第
2開口絞りS2 の開口径を変化させることによって、σ
値を制御することができる。なお、本発明でいうσ値と
は、投影対物レンズ7のN.A.(開口数)に対する照明光
学系のN.A.の比の値として定義される。
With this structure, the σ value is determined by the second aperture stop S 2 . Here, by changing the aperture diameter of the first aperture stop S 1 , it is possible to control the amount of light reaching the irradiated object while keeping the σ value constant. Further, by changing the aperture diameter of the second aperture stop S 2 , σ
You can control the value. The σ value in the present invention is defined as the value of the ratio of the NA of the illumination optical system to the NA (numerical aperture) of the projection objective lens 7.

【0006】[0006]

【実施例】以下、本発明を実施例に基づいて説明する。
図1は本発明による投影露光装置の一実施例の概略構成
を示す展開光路図である。光源手段としてのレーザー光
源10から供給される光束は実質的にコリメートされて
おり、2次光源形成手段としての第1オプティカルイン
テグレータ1によって複数の光源像10a がその射出側空
間の面A上に形成される。この複数光源像10a からの光
束は、正レンズ2を通ってインプットレンズ3により平
行光束に変換されて3次光源形成手段としての第2オプ
ティカルインテグレータ4に入射する。
EXAMPLES The present invention will be described below based on examples.
FIG. 1 is a developed optical path diagram showing a schematic configuration of an embodiment of a projection exposure apparatus according to the present invention. The light flux supplied from the laser light source 10 as the light source means is substantially collimated, and a plurality of light source images 10a are formed on the surface A of the exit side space by the first optical integrator 1 as the secondary light source forming means. To be done. The light flux from the plurality of light source images 10a passes through the positive lens 2 and is converted into a parallel light flux by the input lens 3 and is incident on the second optical integrator 4 as the tertiary light source forming means.

【0007】ここで、第1オプティカルインテグレータ
1は、図2(A) の斜視図に示す如く、四角柱の棒状素子
11が複数束ねて構成されたものであり、各棒状素子11の
入射面11a は凸レンズ面に形成されている。そして、図
2(B) の断面図に示す如く、各棒状素子11の入射面11a
上の凸球面によって、棒上素子11の射出面から離れた位
置に光束の集光点を形成し、この点が2次光源となる。
ここでは、レーザー光源を用いているために光源像には
実質的に大きさが無いと考えられ、第1オプティカルイ
ンテグレータ1の射出側には所謂視野レンズの如きレン
ズ作用を必要とはしない。従って、棒状素子11の射出面
11b はここでは平面に形成されている。このような第1
オプティカルインテグレータ1の構成によって、その射
出側空間の面A上に棒状素子11の数と等しい数の2次光
源が形成される。そして、正レンズ2は第1オプティカ
ルインテグレータ1による複数2次光源の強い集光位置
を避けるために、2次光源の形成される面Aから離れて
配置されている。
Here, as shown in the perspective view of FIG. 2 (A), the first optical integrator 1 is a rod-shaped element of a square pole.
Each of the rod-shaped elements 11 has an entrance surface 11a formed as a convex lens surface. Then, as shown in the sectional view of FIG. 2B, the incident surface 11a of each rod-shaped element 11 is
The upper convex spherical surface forms a condensing point of the light flux at a position away from the exit surface of the rod-shaped element 11, and this point serves as a secondary light source.
Here, since the laser light source is used, it is considered that the light source image has substantially no size, and the exit side of the first optical integrator 1 does not require a lens action such as a so-called field lens. Therefore, the exit surface of the rod-shaped element 11
11b is formed here as a plane. Such a first
Due to the configuration of the optical integrator 1, a number of secondary light sources equal to the number of rod-shaped elements 11 are formed on the surface A of the exit side space. The positive lens 2 is arranged apart from the surface A on which the secondary light sources are formed, in order to avoid the strong converging position of the plurality of secondary light sources by the first optical integrator 1.

【0008】第2オプティカルインテグレータ4も、図
3(A) の斜視図に示す如く、四角柱状の複数の棒状素子
41が束ねられて構成されたものであるが、その入射面41
a と射出面41b とは共に凸レンズ面に形成されている。
そして、図3(B) の断面図に示す如く、両レンズ面の焦
点は棒状素子の互いの対向する面上に位置している。即
ち、入射面41a へ光軸に平行に入射する光束が射出面41
b に集光され、入射面41a に集光状態で入射してくる光
束は射出面41b を射出後、平行光束となるように構成さ
れている。そして、正レンズ2 、インプットレンズ3 及
び第2オプティカルインテグレータの入射面41a とに関
して、2次光源が形成されるA面と第2オプティカルイ
ンテグレータの射出面としてのB面とが共役に構成され
ている。従って、第2オプティカルインテグレータ4の
射出面B上には、第1オプティカルインテグレータ1を
構成する棒状素子11の数と、第2オプティカルインテグ
レータ4を構成する棒状素子41の数との積に相当する数
の3次光源が形成され、ここに実質的に均一な面光源が
形成される。
As shown in the perspective view of FIG. 3A, the second optical integrator 4 also has a plurality of rod-shaped elements in the shape of a square pole.
41 is bundled and configured, but its incident surface 41
Both a and the exit surface 41b are formed as convex lens surfaces.
Then, as shown in the sectional view of FIG. 3 (B), the focal points of both lens surfaces are located on the surfaces of the rod-shaped elements facing each other. That is, the light beam incident on the incident surface 41a parallel to the optical axis is
The light beam that is condensed on b and enters the incident surface 41a in a condensed state is configured to be a parallel light beam after exiting the exit surface 41b. Then, with respect to the positive lens 2, the input lens 3, and the incident surface 41a of the second optical integrator, the A surface on which the secondary light source is formed and the B surface as the exit surface of the second optical integrator are configured to be conjugate. . Therefore, on the exit surface B of the second optical integrator 4, a number corresponding to the product of the number of rod-shaped elements 11 forming the first optical integrator 1 and the number of rod-shaped elements 41 forming the second optical integrator 4. Is formed, and a substantially uniform surface light source is formed therein.

【0009】尚、第1オプティカルインテグレータ1の
射出側に配置される正レンズ2の焦点距離は、この正レ
ンズ2と第2オプティカルインテグレータ4の入射面と
の距離にほぼ等しく配置されている。また、インプット
レンズ3の光源側焦点は前記2次光源が形成されるA面
上にほぼ一致しており、2次光源からの光束を平行光束
に変換している。
The focal length of the positive lens 2 arranged on the exit side of the first optical integrator 1 is substantially equal to the distance between the positive lens 2 and the incident surface of the second optical integrator 4. The focus of the input lens 3 on the light source side substantially coincides with the surface A on which the secondary light source is formed, and converts the light flux from the secondary light source into a parallel light flux.

【0010】第2オプティカルインテグレータ4の射出
面B上の3次光源からの光束は、アウトプットレンズ5
を通って、コンデンサーレンズ6によって収斂され、被
照射物体としてのレティクルR上を照明する。そして、
投影対物レンズ7により、レティクルR上の所定のパタ
ーンがウエハW上に転写される。ここで、コンデンサー
レンズ6によって投影対物レンズ7の入射瞳7a上に、第
2オプティカルインテグレータ4の射出面に成形される
3次光源の像が再結像され、所謂ケーラー照明が達成さ
れる。尚、アウトプットレンズ5は第2オプティカルイ
ンテグレータの射出面側の凸面と同様に、視野レンズと
して機能しているため、必ずしも必要ではなく除去する
ことも可能である。
The light flux from the tertiary light source on the exit surface B of the second optical integrator 4 is output from the output lens 5
After passing through, the light is converged by the condenser lens 6 and illuminates the reticle R as an irradiation object. And
A predetermined pattern on the reticle R is transferred onto the wafer W by the projection objective lens 7. Here, the condenser lens 6 re-images the image of the tertiary light source formed on the exit surface of the second optical integrator 4 on the entrance pupil 7a of the projection objective lens 7, and so-called Koehler illumination is achieved. Since the output lens 5 functions as a field lens, like the convex surface on the exit surface side of the second optical integrator, it is not always necessary and can be removed.

【0011】また、本実施例においては、第1オプティ
カルインテグレータ1の射出側空間の面A上に、口径が
可変の第1開口絞りS1 が設けられており、第2オプテ
ィカルインテグレータ4の射出面B上にも口径が可変の
第2開口絞りS2 が設けられている。この第1開口絞り
1 の口径変化によって、σ値を一定に保ったまま被照
射物体に達する光量を制御することができ、また第2開
口絞りS2 の口径変化によって、σ値を制御することが
できる。σ値とは、投影対物レンズのN.A.(開口数)に
対する照明光学系のN.A.の比の値として定義され、この
値によって投影対物レンズの解像力とコントラストとの
バランスを調整することができる。このような2つの開
口絞りS1 ,S2 の組み合わせによって、光量の制御と
σ値の制御とを独立に行うことが可能となり、光源から
供給される光量の変化や、レティクルR上の投影パター
ンの微細度、ウエハ上に塗布されるレジストの特性等に
応じて、それぞれ最適な照明状態を実現することが可能
となる。
Further, in this embodiment, the first aperture stop S 1 having a variable aperture is provided on the surface A of the exit side space of the first optical integrator 1, and the exit surface of the second optical integrator 4 is provided. A second aperture stop S 2 having a variable aperture is also provided on B. By changing the aperture of the first aperture stop S 1 , it is possible to control the amount of light reaching the irradiated object while keeping the σ value constant, and by changing the aperture of the second aperture stop S 2 , the σ value is controlled. be able to. The σ value is defined as the value of the ratio of the NA of the illumination optical system to the NA (numerical aperture) of the projection objective lens, and the balance between the resolution and the contrast of the projection objective lens can be adjusted by this value. Such a combination of the two aperture stops S 1 and S 2 makes it possible to control the light amount and the σ value independently, and to change the light amount supplied from the light source and the projection pattern on the reticle R. It is possible to realize the optimum illumination state according to the fineness of the above, the characteristics of the resist applied on the wafer, and the like.

【0012】尚、上記の実施例では2次光源形成手段と
しての第1オプティカルインテグレータ1を、光源側の
面に凸球面を向けた平凸レンズ群としたが、これに限る
ものではなく射出面に若干のレンズ作用を持たせること
も可能である。このように、本実施例によれば、最も強
い光強度となる2次光源形成手段による多数光源像を、
該多数光源像形成手段の外部の空間として素子内部での
集光を避けたため、レーザーのような光強度が非常に強
い光源を使用しても、レンズ等の光学素子を破壊する恐
れがない。また、照射物体上で均一な光強度分布を効率
よく得ることのできる投影露光装置が実現される。
In the above embodiment, the first optical integrator 1 as the secondary light source forming means is a plano-convex lens group having a convex spherical surface facing the light source side, but the invention is not limited to this. It is also possible to have a slight lens action. As described above, according to the present embodiment, the multiple light source image formed by the secondary light source forming means having the strongest light intensity is
Since light is not condensed inside the element as a space outside the multiple light source image forming means, there is no fear of destroying optical elements such as lenses even if a light source having a very high light intensity such as a laser is used. Further, a projection exposure apparatus that can efficiently obtain a uniform light intensity distribution on the irradiation object is realized.

【0013】また、本実施例ではレーザー等のコリメー
トされた光束を用いるため、2次光源形成手段としての
第1オプティカルインテグレータ1の射出面には、視野
レンズとしての機能を持たせる必要がなく平面でもよい
ので製造も容易になる。尚、上記実施例は投影露光装置
であったが、本発明はこれに限られるものではなく、種
々の露光装置の照明光学装置としても有効である。ま
た、図示した構成は、分かり易くするために展開光路図
としたものであり、実際の装置においては、所望の位置
に反射部材を設けて光路を折り曲げ、装置全体を小型に
構成することが望ましいことはいうまでもない。
Further, in this embodiment, since a collimated light beam such as a laser is used, the exit surface of the first optical integrator 1 as the secondary light source forming means does not need to have a function as a field lens and is flat. However, manufacturing is also easy because it is acceptable. Although the above embodiment is a projection exposure apparatus, the present invention is not limited to this, and is also effective as an illumination optical apparatus for various exposure apparatuses. Further, the illustrated configuration is a developed optical path diagram for the sake of clarity, and in an actual device, it is desirable to provide a reflecting member at a desired position to bend the optical path to make the entire device compact. Needless to say.

【0014】[0014]

【発明の効果】以上の如く、本発明によれば、照明光学
系の光量の制御とσ値の制御とを独立に行なうことので
きる投影露光装置が提供できる。よって、光源から供給
される光量の変化や、レティクル上の投影パターンの微
細度、ウエハ上に塗布されるレジストの特性等に応じ
て、それぞれ最適な照明状態を実現できる。
As described above, according to the present invention, it is possible to provide a projection exposure apparatus capable of independently controlling the light amount of the illumination optical system and the σ value. Therefore, an optimum illumination state can be realized according to the change in the amount of light supplied from the light source, the fineness of the projected pattern on the reticle, the characteristics of the resist applied on the wafer, and the like.

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

【図1】本発明による一実施例の概略構成を示す展開光
路図。
FIG. 1 is a developed optical path diagram showing a schematic configuration of an embodiment according to the present invention.

【図2】第1の光源像形成手段としての第1オプティカ
ルインテグレータを構成する棒状素子を示す図。
FIG. 2 is a diagram showing a rod-shaped element that constitutes a first optical integrator as a first light source image forming means.

【図3】第2の光源像形成手段としての第2オプティカ
ルインテグレータを構成する棒状素子を示す図。
FIG. 3 is a diagram showing a rod-shaped element that constitutes a second optical integrator as a second light source image forming unit.

【符号の説明】[Explanation of symbols]

10 ‥‥ 光源手段(レーザー)、 1 ‥‥ 2次光源形成手段(第1オプティカルインテ
グレータ)、 4 ‥‥ 3次光源形成手段(第2オプティカルインテ
グレータ)、 6 ‥‥ コンデンサーレンズ、 R,W ‥‥ 被照射物体、 7 ‥‥ 投影対物レンズ、
10 ... light source means (laser), 1 ... secondary light source forming means (first optical integrator), 4 ... tertiary light source forming means (second optical integrator), 6 ... condenser lens, R, W ... Irradiated object, 7 Projection objective lens,

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 FI 技術表示箇所 G03F 7/20 521 9122−2H H01S 3/101 8934−4M ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification number Office reference number FI technical display location G03F 7/20 521 9122-2H H01S 3/101 8934-4M

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】照明光学系からの光によって照明された第
1の物体の像を投影光学系を介して第2の物体上に形成
する投影露光装置において、 前記照明光学系は、 コリメートされた光束を供給する光源手段と、 該光源手段から供給される光束から複数の2次光源を形
成する2次光源形成手段と、 前記2次光源形成手段からの射出光束中に配置され、か
つ前記複数の2次光源をさらに複数形成する3次光源形
成手段と、 前記2次光源形成手段による前記複数の2次光源の大き
さを規定し、かつ開口径が可変に構成された第1の開口
絞りと、 前記3次光源形成手段による前記複数の3次光源の大き
さを規定し、かつ開口径が可変に構成された第2の開口
絞りとを有することを特徴とする投影露光装置。
1. A projection exposure apparatus for forming an image of a first object illuminated by light from an illumination optical system on a second object via the projection optical system, wherein the illumination optical system is collimated. A light source means for supplying a light flux; a secondary light source forming means for forming a plurality of secondary light sources from the light flux supplied from the light source means; and a plurality of secondary light sources arranged in the light flux emitted from the secondary light source forming means. Secondary light source forming means for further forming a plurality of secondary light sources, and a first aperture stop that defines the sizes of the plurality of secondary light sources by the secondary light source forming means and has a variable aperture diameter. And a second aperture stop that defines the size of the plurality of tertiary light sources by the tertiary light source forming means and has a variable aperture diameter.
JP5155045A 1993-06-25 1993-06-25 Projection exposure device Expired - Fee Related JPH0746682B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5155045A JPH0746682B2 (en) 1993-06-25 1993-06-25 Projection exposure device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5155045A JPH0746682B2 (en) 1993-06-25 1993-06-25 Projection exposure device

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP61212064A Division JPH07113735B2 (en) 1986-09-09 1986-09-09 Lighting optics

Publications (2)

Publication Number Publication Date
JPH0645222A true JPH0645222A (en) 1994-02-18
JPH0746682B2 JPH0746682B2 (en) 1995-05-17

Family

ID=15597472

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5155045A Expired - Fee Related JPH0746682B2 (en) 1993-06-25 1993-06-25 Projection exposure device

Country Status (1)

Country Link
JP (1) JPH0746682B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0799693A2 (en) 1996-02-06 1997-10-08 Dow Corning Toray Silicone Co., Ltd. Silicone gel sheets and method for the preparation thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0799693A2 (en) 1996-02-06 1997-10-08 Dow Corning Toray Silicone Co., Ltd. Silicone gel sheets and method for the preparation thereof

Also Published As

Publication number Publication date
JPH0746682B2 (en) 1995-05-17

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