WO2022153672A1 - 光照射装置、およびこれを備える露光装置 - Google Patents
光照射装置、およびこれを備える露光装置 Download PDFInfo
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- 230000003287 optical effect Effects 0.000 claims description 6
- 230000002265 prevention Effects 0.000 abstract description 6
- 230000001678 irradiating effect Effects 0.000 abstract description 5
- 230000006866 deterioration Effects 0.000 abstract description 4
- 230000003760 hair shine Effects 0.000 abstract 1
- 239000004973 liquid crystal related substance Substances 0.000 description 18
- 238000000034 method Methods 0.000 description 17
- 239000011521 glass Substances 0.000 description 10
- 239000000758 substrate Substances 0.000 description 10
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 8
- 229910052753 mercury Inorganic materials 0.000 description 8
- 230000004048 modification Effects 0.000 description 8
- 238000012986 modification Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000003667 anti-reflective effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 210000004209 hair Anatomy 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1303—Apparatus specially adapted to the manufacture of LCDs
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
Definitions
- the present invention relates to a light irradiation device mainly used for exposure when manufacturing a liquid crystal panel, and an exposure device including the light irradiation device.
- liquid crystal display When using a liquid crystal display as a TN type display panel, it does not operate normally just by enclosing the liquid crystal between two glass substrates and applying a voltage to the transparent electrodes formed on the inner surfaces of these glass plates. This is because the liquid crystal molecules are in a disjointed state.
- the liquid crystal In order for the liquid crystal to operate in the normal TN method, it is necessary to orient the liquid crystal molecules in a certain direction and to make the rising direction of the liquid crystal molecules constant. Specifically, the liquid crystal molecules are oriented in a direction of tilting about 3 ° with respect to the glass substrate, and this tilt angle is called a pre-tilt angle.
- one glass substrate is arranged so as to be oriented in the X direction, and the other glass substrate facing the other is arranged in the Y direction orthogonal to the X direction.
- the liquid crystal alignment treatment is required for the production of the liquid crystal panel, and the rubbing treatment for physically rubbing the surface of the glass substrate has been performed conventionally (for example, Patent Document 1).
- This rubbing treatment is a treatment method for forming a film capable of orienting liquid crystal molecules in a certain direction by rubbing an organic polymer film formed on a glass substrate with a cloth having long hairs in a predetermined direction. Is.
- liquid crystal panels With the spread of rubbing processing and the generalization of the TN method, which has a high response speed, liquid crystal panels can be mass-produced at low cost with stable performance, and are used for display monitors and game machines for OA devices such as personal computers. There is a history that LCD monitors have become widespread as monitors.
- the rubbing method has problems related to reliability, such as poor uniformity, the possibility of electrostatic breakdown of the TFT, and adhesion of powder dust generated during rubbing.
- the pre-tilt angle that can be achieved by the rubbing method is about 3 ° in the TN method that represents the horizontally oriented liquid crystal mode as described above, and constitutes a liquid crystal mode display panel that supports high-speed response with low voltage drive. There was a difficulty in doing so.
- the exposure material is set to have photosensitive characteristics so as to react to light in a specific wavelength band, but when looking at the spectral characteristics of the light from a mercury lamp, the light is composed of many emission lines of mercury rays. You can see that there is.
- the present invention has been made in view of the above-mentioned problems, and an object of the present invention is a case where light alignment processing is performed so that light emitted from a light source and passing through a polarizing element is obliquely incident on a work.
- a light source having a plurality of light irradiation units that emit light that is obliquely incident on the work, It is provided with a polarizing element that receives the light from the light source and irradiates the work with the transmitted light.
- Each of the light irradiation units has an LED and a heat sink to which the LED is attached. Light irradiation is performed on the surface of the heat sink, which is directed toward the polarizing element and is exposed to light radiated from another light irradiation unit and reflected on the surface of the polarizing element.
- Equipment is provided.
- a light source having a plurality of light irradiation units that emit light that is obliquely incident on the work, It is provided with a polarizing element that receives the light from the light source and irradiates the work with the transmitted light.
- Each of the light irradiation units has an LED and a heat sink to which the LED is attached.
- a light-shielding plate having a light antireflection treatment is arranged on the surface of the heat sink, which is directed toward the polarizing element and is exposed to light radiated from another light irradiation unit and reflected on the surface of the polarizing element.
- a light irradiator is provided.
- a light source having a plurality of light irradiation units that emit light that is obliquely incident on the work It is provided with a polarizing element that receives the light from the light source and irradiates the work with the transmitted light.
- Each of the light irradiation units has an LED and a heat sink to which the LED is attached.
- the angle formed by the surface of the heat sink and the surface of the polarizing element, which is directed toward the polarizing element and is exposed to the light radiated from another light irradiation unit and reflected by the surface of the polarizing element, is 90 °-( ⁇ ).
- ⁇ is the angle formed by the light having the largest angle with the optical axis of the light irradiation unit and the surface of the polarizing element among the lights emitted from the other light irradiation unit.
- An exposure apparatus including the above-mentioned light irradiation apparatus is provided.
- the light irradiation device According to the light irradiation device according to the present invention, light reflection prevention treatment is applied to the surface of the heat sink constituting each light irradiation unit, which is exposed to the light emitted from another light irradiation unit and reflected on the surface of the polarizing element. Therefore, the light radiated from another light irradiation unit and reflected on the surface of the polarizing element hits the heat sink of the light irradiation unit, is further reflected, and is directed to the polarizing element again, and the light is intended for the polarizing element. By entering from the direction opposite to the direction, it is possible to avoid deterioration of the accuracy of the photoalignment processing for the work.
- FIG. 10 It is a figure which shows the light irradiation apparatus 10 which includes the light source 12 which was composed of a plurality of light irradiation units 14 to which this invention was applied. It is a figure explaining the light radiated from another light irradiation unit 14 and reflected by the surface of a polarizing element 20. It is a figure which shows the light irradiation apparatus 10 which concerns on modification 1. FIG. It is a figure which shows the light irradiation apparatus 10 which concerns on modification 3. It is a figure which shows the light irradiation apparatus 10 which concerns on modification 4.
- the light irradiation device 10 (Structure of light irradiation device 10) The light irradiation device 10 according to the embodiment to which the present invention is applied will be described below.
- the light irradiation device 10 is incorporated and used in the exposure device mainly for exposure when manufacturing a liquid crystal panel.
- the light irradiation device 10 generally includes a light source 12 and a polarizing element 20.
- the light source 12 is a member that irradiates the exposure light L toward the exposure surface A on which the work (exposure object) X is placed, and a plurality of light irradiation units 14 are used in this embodiment.
- Each of these light irradiation units 14 includes an LED 16 that irradiates light and a heat sink 18 to which the LED 16 is attached.
- the light source 12 irradiates the exposure light L so as to scan the work X moving in a certain direction on the exposed surface A
- a plurality of the light sources 12 are directed in directions orthogonal to the moving direction of the work X. It is formed by arranging the light irradiation units 14 of the above in substantially series.
- the light irradiating device 10 may move to the work X to irradiate the exposure light L, or both the work X and the light irradiating device 10 may move.
- Each LED 16 constituting each light irradiation unit 14 has a first angle ⁇ 1 (that is, an incident angle ⁇ 1) with respect to the work X so that the optical axis CL of these LEDs 16 has a first angle ⁇ 1 (that is, an incident angle ⁇ 1) with respect to the work X (that is, exposure). It is arranged at an angle (with respect to the surface A).
- the LED 16 is not limited to a specific one, and may be a COB (chip on board), an SMD (surface mount type), or a so-called cannonball type.
- the heat sink 18 has a role of radiating heat generated from the LED 16 during light emission to prevent the temperature of the LED 16 from becoming excessively high, and the LED 16 is attached to the surface of the heat sink 18.
- the size of the heat sink 18 is required to be large enough to radiate heat from the LED 16. Further, the heat sink 18 according to the present embodiment has a rectangular cross section, and the light emitted from another light irradiation unit 14 toward the polarizing element 20 and reflected on the surface of the polarizing element 20 is emitted. It is characterized in that the side surface 19 that hits the surface 19 is subjected to an antireflection treatment. Specific examples of this light reflection prevention treatment include black plating, black alumite, and black coating.
- the cross-sectional shape of the heat sink 18 is not particularly limited to a rectangular shape, but whatever the cross-sectional shape is, it is radiated from another light irradiation unit 14 in the heat sink 18 and polarized. It is preferable to apply an antireflection treatment to the surface of the element 20 that is exposed to the reflected light.
- the polarizing element 20 is an element that transmits and polarizes only a light component that vibrates in one direction among the light emitted from the light source 12, and in the present embodiment, a wire grid polarizing element is used.
- the wire grid polarizing element has a wire grid formed on one surface of a transparent substrate (glass substrate).
- the formation surface 22 of the wire grid may be the surface of the polarizing element 20 on the light source 12 side or the surface opposite to the light source 12. Further, it is preferable that the polarizing element 20 is arranged so as to be parallel to the work X (exposed surface A).
- the surface 19 of the heat sink 18 constituting each light irradiation unit 14 is exposed to the light emitted from another light irradiation unit 14 and reflected on the surface of the polarizing element 20. Anti-reflective treatment is applied.
- the light radiated from another light irradiation unit 14 and reflected on the surface of the polarizing element 20 hits the heat sink 18 of the light irradiation unit 14 and is further reflected toward the polarizing element 20 again. Therefore, it is possible to avoid deteriorating the accuracy of the photo-alignment process for the work by allowing the light to enter the polarizing element 20 from a direction opposite to the intended direction (see the dotted arrow).
- Modification example 1 According to the light irradiation device 10 according to the above-described embodiment, the surface 19 of the heat sink 18 constituting each light irradiation unit 14 is exposed to the light emitted from another light irradiation unit 14 and reflected on the surface of the polarizing element 20.
- the light reflection prevention treatment was applied, but instead of this, as shown in FIG. 3, the surface 19 of the heat sink 18 to which the light reflected on the surface of the polarizing element 20 hits and the surface of the polarizing element 20
- the angle ⁇ 2 formed may be set to be “90 ° ⁇ ( ⁇ /2)” or more.
- This " ⁇ " is the angle formed by the light L max having the largest angle with the optical axis CL of the light irradiation unit 14 and the surface of the polarizing element 20 among the lights emitted from another light irradiation unit 14.
- the reflected light is the light of the polarizing element 20. Since it does not face the surface, it is possible to avoid deterioration of the accuracy of the photo-alignment process for the work due to the light entering from the direction opposite to the intended direction with respect to the polarizing element 20, as in the above-described embodiment.
- the angle ⁇ 2 formed by the surface 19 of the heat sink 18 to which the light reflected by the surface of the polarizing element 20 hits and the surface of the polarizing element 20 is set as described above, and the light reflected by the surface of the polarizing element 20 hits.
- the surface 19 of the heat sink 18 may be subjected to an antireflection treatment.
- the second angle ⁇ 3, which is half of the light distribution angle of the light L emitted from each light irradiation unit 14, may be set to be smaller than the above-mentioned first angle ⁇ 1.
- the surface of the heat sink 18 constituting each light irradiation unit 14 is exposed to the light emitted from another light irradiation unit 14 and reflected on the surface of the polarizing element 20.
- the light reflection prevention treatment is applied to 19, instead of this, a light-shielding plate 30 may be attached to the surface 19 exposed to the light, for example, as shown in FIG.
- the surface of the light-shielding plate 30 is light-reflected (for example, black alumite-treated), and is formed along the surface 19 of the heat sink 18 so as to have a predetermined angle with respect to the polarizing element 20. Have been placed.
- the end portion of the light-shielding plate 30 on the side far from the polarizing element 20 is bent so as not to interfere with the heat sink 18 arranged next to it.
- the surface 19 of the heat sink 18 to which the light-shielding plate 30 is attached is set so that the angle ⁇ 2 formed by the surface 19 and the surface of the polarizing element 20 is “90 ° ⁇ ( ⁇ /2)” or more as shown in the figure. It may be a surface 19 having an angle other than this (for example, as shown in FIG. 1).
- the light irradiation device 10 may be covered with a light-shielding box 32 so that the light from the LED 16 does not leak to the outside, for example, as shown in FIG. Further, it is preferable to apply a light reflection prevention treatment to the inner surface of the light-shielding box 32.
Abstract
Description
ワークに対して斜めに入射する光を放射する複数の光照射ユニットを有する光源と、
前記光源からの前記光を受け、透過させた前記光を前記ワークに照射する偏光素子とを備えており、
前記各光照射ユニットは、それぞれ、LEDと、前記LEDが取り付けられるヒートシンクとを有しており、
前記偏光素子に向かい、別の前記光照射ユニットから放射されて前記偏光素子の表面で反射した光が当たる前記ヒートシンクの面には、光反射防止処理が施されていることを特徴とする
光照射装置が提供される。
ワークに対して斜めに入射する光を放射する複数の光照射ユニットを有する光源と、
前記光源からの前記光を受け、透過させた前記光を前記ワークに照射する偏光素子とを備えており、
前記各光照射ユニットは、それぞれ、LEDと、前記LEDが取り付けられるヒートシンクとを有しており、
前記偏光素子に向かい、別の前記光照射ユニットから放射されて前記偏光素子の表面で反射した光が当たる前記ヒートシンクの面には、表面に光反射防止処理が施された遮光板が配置されている
光照射装置が提供される。
ワークに対して斜めに入射する光を放射する複数の光照射ユニットを有する光源と、
前記光源からの前記光を受け、透過させた前記光を前記ワークに照射する偏光素子とを備えており、
前記各光照射ユニットは、それぞれ、LEDと、前記LEDが取り付けられるヒートシンクとを有しており、
前記偏光素子に向かい、別の前記光照射ユニットから放射されて前記偏光素子の表面で反射した光が当たる前記ヒートシンクの面と、前記偏光素子の前記表面とが成す角度は、90°-(α/2)以上であることを特徴とする
光照射装置が提供される。
なお、ここで「α」は、別の前記光照射ユニットから放射される前記光のうち、前記光照射ユニットの光軸と最も大きな角度を有する光と、前記偏光素子の前記表面とが成す角度をいう。
上述した光照射装置を備える露光装置が提供される。
本発明が適用された実施形態に係る光照射装置10について以下に説明する。光照射装置10は、主に液晶パネルを製造する際の露光の為に露光装置に組み込まれて用いられる。この光照射装置10は、図1に示すように、大略、光源12と、偏光素子20とを備えている。
本実施形態に係る光照射装置10によれば、各光照射ユニット14を構成するヒートシンク18における、別の光照射ユニット14から放射されて偏光素子20の表面で反射した光が当たる面19に光反射防止処理が施されている。
上述した実施形態に係る光照射装置10によれば、各光照射ユニット14を構成するヒートシンク18における、別の光照射ユニット14から放射されて偏光素子20の表面で反射した光が当たる面19に光反射防止処理を施すようになっていたが、これに変えて、図3に示すように、ヒートシンク18における、偏光素子20の表面で反射した光が当たる面19と偏光素子20の表面とが成す角度θ2が「90°-(α/2)」以上となるように設定してもよい。
また、各光照射ユニット14から放射される光Lの配光角の半分である第2の角度θ3を、上述した第1の角度θ1よりも小さくなるように設定してもよい。
さらに、上述した実施形態に係る光照射装置10によれば、各光照射ユニット14を構成するヒートシンク18における、別の光照射ユニット14から放射されて偏光素子20の表面で反射した光が当たる面19に光反射防止処理を施すようになっていたが、これに変えて、例えば図4に示すように、当該光が当たる面19に遮光板30を取り付けてもよい。
また、LED16からの光が外部へ漏れないように、例えば図5に示すように、光照射装置10を遮光ボックス32で覆ってもよい。さらに、この遮光ボックス32の内面に光反射防止処理を施すのが好適である。
20…偏光素子、22…ワイヤーグリッドの形成面、30…遮光板、32…遮光ボックス
X…ワーク(露光対象物)、A…露光面、L…露光用光、CL…(LED16の)光軸、θ1…第1の角度、θ2…偏光素子20の表面で反射した光が当たるヒートシンク18の面19と偏光素子20の表面とが成す角度、θ3…第2の角度
Claims (4)
- ワークに対して斜めに入射する光を放射する複数の光照射ユニットを有する光源と、
前記光源からの前記光を受け、透過させた前記光を前記ワークに照射する偏光素子とを備えており、
前記各光照射ユニットは、それぞれ、LEDと、前記LEDが取り付けられるヒートシンクとを有しており、
前記偏光素子に向かい、別の前記光照射ユニットから放射されて前記偏光素子の表面で反射した光が当たる前記ヒートシンクの面には、光反射防止処理が施されていることを特徴とする
光照射装置。 - ワークに対して斜めに入射する光を放射する複数の光照射ユニットを有する光源と、
前記光源からの前記光を受け、透過させた前記光を前記ワークに照射する偏光素子とを備えており、
前記各光照射ユニットは、それぞれ、LEDと、前記LEDが取り付けられるヒートシンクとを有しており、
前記偏光素子に向かい、別の前記光照射ユニットから放射されて前記偏光素子の表面で反射した光が当たる前記ヒートシンクの面には、表面に光反射防止処理が施された遮光板が配置されている
光照射装置。 - ワークに対して斜めに入射する光を放射する複数の光照射ユニットを有する光源と、
前記光源からの前記光を受け、透過させた前記光を前記ワークに照射する偏光素子とを備えており、
前記各光照射ユニットは、それぞれ、LEDと、前記LEDが取り付けられるヒートシンクとを有しており、
前記偏光素子に向かい、別の前記光照射ユニットから放射されて前記偏光素子の表面で反射した光が当たる前記ヒートシンクの面と、前記偏光素子の前記表面とが成す角度は、90°-(α/2)以上であることを特徴とする
光照射装置。
「α」は、別の前記光照射ユニットから放射される前記光のうち、前記光照射ユニットの光軸と最も大きな角度を有する光と、前記偏光素子の前記表面とが成す角度をいう。 - 請求項1から3のいずれか1項に記載の光照射装置を備える露光装置。
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Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH04216614A (ja) * | 1990-12-17 | 1992-08-06 | Mitsubishi Electric Corp | レーザ光照射装置 |
JP2005251588A (ja) * | 2004-03-04 | 2005-09-15 | Hamamatsu Photonics Kk | 光照射装置 |
JP2011217241A (ja) * | 2010-04-01 | 2011-10-27 | Ushio Inc | Led線状光源装置および原稿読取装置用光照射装置 |
JP2017102219A (ja) * | 2015-11-30 | 2017-06-08 | ウシオ電機株式会社 | 光照射装置および光照射方法 |
JP2018017952A (ja) * | 2016-07-29 | 2018-02-01 | ウシオ電機株式会社 | 光照射装置および光照射方法 |
CN209014871U (zh) * | 2018-07-16 | 2019-06-21 | 香港科技大学 | 用于光取向的曝光头和曝光系统 |
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JP2007017475A (ja) | 2005-07-05 | 2007-01-25 | Sanyo Epson Imaging Devices Corp | ラビング処理方法及びこのラビング処理方法を用いた液晶表示パネルの製造方法 |
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2021
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- 2021-11-19 KR KR1020237019569A patent/KR20230101902A/ko unknown
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Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH04216614A (ja) * | 1990-12-17 | 1992-08-06 | Mitsubishi Electric Corp | レーザ光照射装置 |
JP2005251588A (ja) * | 2004-03-04 | 2005-09-15 | Hamamatsu Photonics Kk | 光照射装置 |
JP2011217241A (ja) * | 2010-04-01 | 2011-10-27 | Ushio Inc | Led線状光源装置および原稿読取装置用光照射装置 |
JP2017102219A (ja) * | 2015-11-30 | 2017-06-08 | ウシオ電機株式会社 | 光照射装置および光照射方法 |
JP2018017952A (ja) * | 2016-07-29 | 2018-02-01 | ウシオ電機株式会社 | 光照射装置および光照射方法 |
CN209014871U (zh) * | 2018-07-16 | 2019-06-21 | 香港科技大学 | 用于光取向的曝光头和曝光系统 |
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JPWO2022153672A1 (ja) | 2022-07-21 |
JP7191434B2 (ja) | 2022-12-19 |
KR20230101902A (ko) | 2023-07-06 |
TW202227889A (zh) | 2022-07-16 |
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