WO2011121694A1 - 検査装置、及び検査方法 - Google Patents
検査装置、及び検査方法 Download PDFInfo
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- WO2011121694A1 WO2011121694A1 PCT/JP2010/007351 JP2010007351W WO2011121694A1 WO 2011121694 A1 WO2011121694 A1 WO 2011121694A1 JP 2010007351 W JP2010007351 W JP 2010007351W WO 2011121694 A1 WO2011121694 A1 WO 2011121694A1
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- light
- inspection apparatus
- optical system
- inspection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/956—Inspecting patterns on the surface of objects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/9501—Semiconductor wafers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/062—LED's
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/08—Optical fibres; light guides
Definitions
- the present invention relates to an inspection apparatus and an inspection method for inspecting a substrate.
- the present invention relates to a surface inspection apparatus for detecting defects such as minute foreign matters and scratches on a semiconductor wafer.
- Patent Document 1 that collects and irradiates illumination light on the surface of a sample and detects light scattered by surface roughness or defects can be cited.
- Patent Documents 2 and 3 are cited as inspection apparatuses using LEDs as light sources.
- Patent Document 4 can be cited.
- Patent Document 5 is given as another prior art of the surface inspection apparatus.
- the LED is a surface light emitting element
- problems that it is difficult to focus on a minute region like a laser light source, and that the shape and light intensity distribution of the light emitting element are complicated.
- the present invention has the following features.
- the first feature of the present invention is that it has an LED light source (for example, a light-emitting element using electroluminescence), irradiates the emitted light onto the sample surface through a fiber, and forms an image of the scattered light on a plurality of pixel sensors.
- an LED light source for example, a light-emitting element using electroluminescence
- irradiates the emitted light onto the sample surface through a fiber and forms an image of the scattered light on a plurality of pixel sensors.
- the influence of surface roughness is spatially removed to detect scattered light caused by defects with higher sensitivity than in the past.
- the second feature of the present invention is that the scattered light is imaged on an image intensifier and has a plurality of pixel sensors such as TDI and CCD which are lens-coupled. To prevent it, it is to shift the image intensifier.
- the third feature of the present invention is that it has at least one LED light source and a waveguide member that guides light from the LED light source.
- a fourth feature of the present invention is that the irradiation optical system includes an optical element that diffuses light from the LED light source between the LED light source and the waveguide member.
- a fifth feature of the present invention is that the waveguide member is a fiber or an iris.
- a sixth feature of the present invention is that the waveguide member is a single core fiber.
- a seventh feature of the present invention is that the waveguide member is a multi-core fiber.
- the eighth feature of the present invention is that cores are arranged in a straight line at the substrate-side end of the multi-core fiber.
- a ninth feature of the present invention is to have a first LED light source having a first wavelength and a second LED light source having a second wavelength.
- a tenth feature of the present invention is that the irradiation optical system includes a reflection optical system.
- a first multicore fiber that guides first light from the first LED light source
- a second multicore fiber that guides second light from the second LED light source.
- the core of the first multi-core fiber and the core of the second multi-core fiber that guides the second light from the second LED light source are alternately arranged at the end on the substrate side. There is in being.
- the twelfth feature of the present invention is that the core of the first multi-core fiber and the core of the second multi-core fiber that guides the second light from the second LED light source are at the end on the substrate side. It is that they are randomly arranged.
- the thirteenth feature of the present invention resides in having a cylindrical lens for condensing light that has passed through the waveguide member.
- the fourteenth feature of the present invention is that it has an optical element that adjusts the polarization of light that has passed through the waveguide member.
- a fifteenth feature of the present invention is a detection optical system that detects light from the substrate, the detection optical system is an imaging optical system, and the detection optical system includes a sensor having a plurality of pixels. There is.
- the sixteenth feature of the present invention is that it has an amplifying element for amplifying light from the substrate, and the sensor detects light amplified by the amplifying element.
- the seventeenth feature of the present invention is that it has a moving part for moving the amplifying element.
- the eighteenth feature of the present invention resides in having an optical element that spatially divides between the sensor and the amplifying element.
- a twentieth feature of the present invention resides in that the averaged light is condensed into a linear shape and irradiated onto the substrate.
- a twenty-first feature of the present invention resides in that a region of the amplifying element that is exposed to light from the substrate is changed.
- the twenty-second feature of the present invention is that the amplified light is spatially divided and imaged.
- the complicated light intensity distribution of an LED light source is eliminated, and the test
- an inspection apparatus having the following effects can be realized.
- the following effects may be played independently or may be played simultaneously.
- FIG. 1 is a schematic diagram of a surface inspection apparatus according to Embodiment 1.
- FIG. The figure which showed the positional relationship of an illumination spot and a detection optical system. Schematic of a detection optical system using a diffraction grating.
- FIG. The figure which shows the magnitude
- FIG. 3 is a schematic diagram of a detection system of Example 2. Schematic of the illumination system of Example 3. Schematic of the core arrangement method of the multi-core fiber in Example 4.
- FIG. Schematic of the illumination system of Example 5. Schematic of the illumination system of Example 6.
- FIG. 10 is a schematic view of a surface inspection apparatus in Example 7. The enlarged view of the light quantity adjustment part in Example 7.
- FIG. FIG. 10 is a schematic diagram of a light amount adjustment evaluation apparatus in Example 7. The enlarged view of the multiplexer in Example 7.
- FIG. 1 is a schematic view of a surface inspection apparatus according to the first embodiment.
- LED light sources 10a and 10b for illumination diffusers 11a and 11b, lenses 12a and 12b, optical fibers 13a and 13b, a sample stage 101, a stage drive unit 102, and a multi-pixel sensor 104 that detects scattered light.
- a signal processing unit 105 an overall control unit 106 that performs various controls described later, a mechanical control unit 107, an information display unit 108, an input operation unit 109, a storage unit 110, and the like.
- the stage drive unit 102 includes a rotation drive unit 111 that rotates the sample stage 101 around the rotation axis, a vertical drive unit 112 that moves in the vertical direction, and a slide drive unit 113 that moves in the radial direction of the sample.
- the sample 100 is irradiated with light from the LED light sources 10a and 10b for illumination using optical fibers 13a and 13b, which are examples of waveguide members, and foreign matter and defects present on the sample surface or in the vicinity of the surface, and the sample surface.
- the scattered, diffracted, or reflected light is collected by the detection optical system 116 and imaged on the multi-pixel sensor 104 to be detected.
- the sample stage 101 supports the sample 100 such as a wafer, and the illumination light relatively moves on the sample 100 by moving the sample stage 101 horizontally by the slide drive unit 113 while rotating the sample stage 101 by the rotation drive unit 111. Scan in a spiral.
- the light scattered by the unevenness of the sample surface is continuous, and the scattered light due to the defect is generated in a pulse manner, and shot noise of the light generated continuously becomes a noise component of the surface inspection apparatus.
- FIG. 2 is a diagram showing the positional relationship between the illumination spot and the detection optical system.
- FIG. 1 Although one multi-pixel sensor is illustrated in FIG. 1, the number of sensors is not limited as in FIG. 2, and at least one of the azimuth angle ⁇ and the elevation angle ⁇ from the illumination light 202 is different. It suffices if a detector is arranged.
- the detection optical system forms an image of the first real image of the scattered light on the diffraction grating 303 by the imaging optical system 301 as shown in FIG.
- the second imaging optical system 302 may enlarge and form an image on the multi-pixel sensor 104c.
- FIG. 4 is a schematic diagram of the detection unit circuit.
- the generated scattered light is detected by the plurality of pixel sensors 104, and the signal processing unit 105 passes the BPF (band pass filter 402) and the LPF (low pass filter 405), and separates them into a high frequency component and a low frequency component, respectively.
- BPF band pass filter 402
- LPF low pass filter 405
- Each signal is corrected by the amplifiers 403 and 406 so as to have the same sensitivity as the other channels, converted into digital signals by the analog / digital converters 404a and 404b, and stored in the storage unit 407 of the computer.
- the signal intensity may be corrected using the amplifier 401.
- Examples of the effects of using LEDs in place of lasers in surface inspection apparatuses include the following.
- the following effects may be played independently or may be played simultaneously.
- the light source of the surface inspection apparatus has a long life.
- the light emitted from the LED light sources 10a and 10b for illumination is diffused by the diffusion plates 11a and 11b.
- light is introduced into the single core optical fibers 13a and 13b using the lenses 12a and 12b.
- the optical fibers 13a and 13b may be multimode fibers.
- the multi-mode fiber has a large core diameter, the light loss at the fiber end face can be reduced even with LED light that cannot be spot condensed.
- the intensity is further averaged and the peak of specific light intensity is alleviated.
- a condensing lens 15 is arranged at the end of the fiber, and is condensed and irradiated on the sample surface.
- the condensing lens 15 may be a cylindrical lens in order to illuminate linearly.
- the polarizer 16 may be passed.
- the polarizer 16 can be rotated to adjust the direction of polarization.
- the light intensity distribution on the sample surface may be measured in advance, and the signal may be normalized based on the intensity distribution.
- a parabolic mirror is used instead of the transmission type detection optical system using the condensing lens 15 or the like in the optical path after the optical fiber. It is better to use a reflective optical system using
- Another problem when using an LED is that because the LED is surface emitting, spot irradiation cannot be performed on the sample surface, and an image is formed with a certain size according to the invariant of Helmholtz-Lagrange. .
- a noise component is spatially removed and the sensitivity is increased by using an imaging detection optical system and a plurality of pixel sensors.
- FIG. 5 is a schematic diagram relating to signals of the second embodiment.
- FIG. 5A shows the illumination light 501 and the signal intensity on the sample surface when a laser is used as a light source as in the prior art.
- area C is the same as that of area A.
- the sample is rotated, and the scattered light due to the defect is detected in a pulse manner in a region B where the illumination light 501 passes through the defect 502.
- a laser When a laser is used as a light source for illumination, it can be focused on a minute area, so that there is little scattered light due to sample surface roughness.
- FIG. 5B shows a case where an LED is selected as the light source.
- FIG. 6 is a diagram showing the signal intensity when a multi-pixel photosensor is used.
- the main method for detecting minute foreign matter is to increase the amount of incident light and increase the amount of scattered light generated from the foreign matter, or to increase the inspection time and integrate scattered light.
- the noise component is reduced by using a plurality of pixel sensors as in the second embodiment.
- Increasing the amount of incident light may increase the temperature of the sample surface and cause damage.
- a multi-pixel sensor is used to detect minute foreign matters while maintaining the inspection time.
- the detection range can be spatially divided and measured, so that the light scattered by the unevenness of the sample surface can be reduced and finer defects can be detected. .
- the required number of pixels can be calculated from the number of scattered photons by the corresponding particles and the number of scattered photons by the surface roughness.
- the photoelectrically converted electrons are amplified using an MCP (Multi Channel Plate) 703 and incident on the fluorescent plate 704 to obtain visible light.
- MCP Multi Channel Plate
- the position of the image intensifier 701 is shifted by the horizontal driving unit 707 which is an example of the moving unit, and a new location is obtained as shown in FIG. To detect and amplify the light.
- a sensor 708 for measuring the shift amount of the image intensifier 701 may be provided.
- the limited area of the image intensifier 701 can be used effectively.
- the scattered light is imaged in a linear shape on the image intensifier.
- a sensor 709 that measures the angle of the image intensifier, and an angle adjustment mechanism 710 that adjusts the angle based on the sensor 709 may be provided.
- the image intensifier can be moved while suppressing distortion of the multi-pixel sensor.
- lens coupling is performed by dividing (dividing) the image intensifier 701 and the plurality of pixel sensors 104 by using a microarray lens 705 or the like instead of fiber coupling.
- the image sensor system combining the image intensifier 701 and the CCD or TDI camera has been described as the multi-pixel sensor 104.
- a multi-anode photomultiplier tube, avalanche photodiode array, CCD A linear sensor, EM-CCD (Electron Multiplying CCD), or EB-CCD (Electron Bombardment CCD) may be used.
- Example 3 will be described.
- parts different from the first and second embodiments will be mainly described.
- FIG. 8 is a schematic diagram of the illumination system of the third embodiment.
- a multi-core optical fiber is used for thin line illumination.
- the light emitted from the LED light source 10a is introduced into the single core fiber 13a using the lens 12a, and the light intensity is made uniform.
- FIG. 8 (d) is an enlarged view of the coupling portion of FIG. 8 (a).
- the light that has been made uniform after passing through the single core fiber 13a is converted into parallel light by the parallel light lens 807 and introduced into the multi-core fiber 801 by the micro lens 808 so as not to lose the light.
- the position (focal position) where the parallel light is collected by the microlens 808 exists on the end face of the multi-core fiber 801.
- the fiber terminal portion 803 arranges the cores 805 arranged as shown in FIG. 8B in a ribbon shape (in other words, a linear shape or a belt shape) as shown in FIG. 8C.
- the light is emitted linearly and further condensed on the sample surface by the condensing lens 15.
- the condensing lens 15 may be a cylindrical lens.
- a luminance unevenness may be reduced by installing a diffusion plate between the multi-core fiber and the sample surface.
- the cores may be arranged regularly such that the center of the fiber start end portion is the center of the end end portion, and the fibers are sequentially arranged outward. You may arrange at random regardless of order.
- FIG. 10 is a schematic diagram of the illumination system of the fifth embodiment.
- the light is reflected by a total reflection optical system (for example, a concave mirror 1005, which is a kind of mirror 1005, and a mirror 1006) and condensed on the sample 100 via the polarizer 16.
- a total reflection optical system for example, a concave mirror 1005, which is a kind of mirror 1005, and a mirror 1006
- thin line illumination when thin line illumination is performed using a plurality of LEDs having different wavelengths and a multi-core fiber, they may be coupled by a single-core fiber part or a multi-core fiber part.
- the influence of chromatic aberration can be prevented. Further, by using different wavelengths, it is possible to efficiently detect defects having wavelength dependency.
- an iris 1102 for light selection which is another example of the waveguide member, is used instead of the optical fiber. It may be installed behind the condensing lens 1101, and only a desired light intensity distribution region may be taken out, condensed by the condensing lens 15, and condensed on the sample surface via the polarizer 16.
- a light condensing reflecting mirror 1103 is disposed from the back to the side of the light source, and a fiber condensing lens in front of the LED. Light may be introduced into the fiber 13a using 12a.
- FIG. 12 is a schematic view of a surface inspection apparatus in Example 7.
- illumination LED light sources 10a and 10b As shown in FIG. 12, illumination LED light sources 10a and 10b, diffuser plates 11a and 11b, lenses 12a and 12b, optical fibers 13a and 13b, intensity adjustment stages 19a and 19b, multiplexer 14, and multi-core fiber having the same intensity.
- the stage drive unit 102 includes a rotation drive unit 111 that rotates the sample stage 101 around the rotation axis, a vertical drive unit 112 that moves in the vertical direction, and a slide drive unit 113 that moves in the radial direction of the sample.
- the light from the LED light sources 10a, 10b for illumination is introduced into optical fibers 13a, 13b, which are examples of waveguide members, and the light from a plurality of LEDs is combined by the multiplexing unit 14 to increase the luminance.
- the emitted light is introduced into the multi-core fiber 18 through the coupling portion 17.
- the sample 100 is irradiated with the lens 15.
- the detection optical system 116 collects the scattered, diffracted or reflected light on the sample surface or in the vicinity of the sample surface and the sample surface, and forms an image on the multi-pixel sensor 104 for detection. .
- FIG. 12 shows one multi-pixel sensor, but the number of sensors is not limited.
- the sensor may be a single channel PMT or a photodiode instead of a plurality of pixels.
- the sample stage 101 supports the sample 100 such as a wafer, and the illumination light relatively moves on the sample 100 by moving the sample stage 101 horizontally by the slide drive unit 113 while rotating the sample stage 101 by the rotation drive unit 111. Scan in a spiral.
- the time for which light is irradiated is different between the central portion and the outer peripheral portion of the sample 100.
- FIG. 13 is a schematic diagram of a light intensity adjustment mechanism used to make the SN ratio uniform and prevent sample damage.
- the light intensity adjusting stage 19a is used to change the position of the fiber incident end with respect to the focal position of the lens 12a, thereby adjusting the amount of light incident on the fiber 13a.
- the position of the condenser lens or the light source may be adjusted simultaneously or independently instead.
- a moving stage using a piezo element is preferable because it can be finely adjusted, but a ball screw system may be used.
- the same effect can be obtained by changing the amount of current flowing to the light source to change the light emission intensity of the light source.
- the fiber condensing lens 12a preferably has a short focal point and a high NA.
- an aspheric lens is used as the fiber condensing lens 12c as shown in FIG. In combination, the light utilization efficiency is higher when the light is condensed on the fiber end face after collimation.
- FIG. 14 is a schematic diagram of a light quantity adjustment evaluation apparatus used in the seventh embodiment.
- the intensity of light passing through the illumination LED light source 10a, the diffuser plate 11a, the fiber condensing lens 12a, and the optical fiber 13a is previously measured using a measuring instrument such as the power measuring instrument 20.
- a measuring instrument such as the power measuring instrument 20.
- the relationship between the light intensity and the stage positions of the light quantity adjustment stages 19a and 19b as shown in FIG. 14B is obtained.
- a desired light intensity with respect to the sample position is determined from the position of the optical fiber 12a (FIG. 14 (c)).
- FIG. 14C shows the position of the slide drive unit 113 moved in the radial direction of the sample (in other words, the position of the illumination spot formed on the sample 100) (vertical axis) and the stages of the light quantity adjustment stages 19a and 19b. It represents the relationship with the position (horizontal axis).
- the values shown in the table of FIG. 14C are stored, and the light amount is automatically adjusted according to the sample position.
- the relative distance between the illumination LED light source and the optical fiber 13 is changed in accordance with the operation of the transport system such as the position of the stage, and the intensity of the light irradiated to the sample is changed. I do.
- the relative distance between the illumination LED light source and the optical fiber 13 is changed from the inner periphery to the outer periphery of the sample 100, and control for changing the intensity of light irradiated on the sample is performed. be able to.
- the light quantity adjustment evaluation apparatus is not used, but the surface inspection apparatus shown in FIG. ) May be actually measured before the inspection.
- FIG. 15 is an enlarged view of the fiber multiplexing unit 14.
- LED is a surface light emitting element and has a larger directivity angle than lasers and LDs, and therefore has lower brightness than lasers and LDs.
- the core diameter is the same for both the incident side and the outgoing side.
- the propagation angle ⁇ is smaller than the maximum light receiving angle, so the propagation angle ⁇ can be expressed as follows.
- Equation 5 the relationship of ⁇ for combining light without loss can be expressed by Equation 5.
- Example 7 the same excellent effect as in Example 1 can be obtained, and further, the effect of preventing damage to the sample while making the SN ratio uniform can be achieved.
- the two illumination LED light sources 10a and 10b are used.
- the number of illumination LED light sources may be one.
- the intensity of the two LED light sources for illumination 10a and 10b may be different.
- the wavelengths of the two LED light sources for illumination 10a and 10b may be different from each other.
- an optical system that reduces the influence of chromatic aberration may be combined as in the fifth embodiment.
- Example 1 the same excellent effect as in Example 1 can be obtained, and the sample can be prevented from being damaged while the S / N ratio is made uniform, and the influence of chromatic aberration can be prevented. Can be detected.
- the inspection object is not limited to a semiconductor wafer, and can be applied to inspection of a substrate such as a hard disk substrate or a liquid crystal substrate.
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Abstract
Description
(1)長寿命である。
(2)安価である。
(3)光源自体の大きさ以外に、電源及び冷却器などのスペースが不要になるため省スペースである。それに伴い消費される電力も少なくすることができる。
(4)LEDは連続発光させることができるので、高エネルギー密度の短パルスレーザのように試料表面や光学素子を損傷させにくい。
(1)表面検査装置の光源が長寿命となる。
(2)光源自体の大きさが小さくなる上に、電源及び冷却器などのスペースが不要になるため省スペースな表面検査装置を構成できる。
(3)消費電力の少ない表面検査装置を構成できる。
(4)電源及び冷却器が不要になるため高性能な表面検査装置を安価に構成できる。
(5)LEDは連続発光させることができるので、高エネルギー密度の短パルスレーザに比べて試料表面を損傷させにくい表面検査装置を構成することができる。
11a,11b 拡散板
12a,12b,12c ファイバ集光用レンズ
13a,13b 光ファイバ
14 カプラ
15,1101 集光用レンズ
16 偏光子
17 結合部
18,801,1001a,1001b マルチコアファイバ
19a,19b 光量調整ステージ
20 パワー測定器
21 ファイバ固定部
22 ファイバクラッド部
23 ファイバコア部
100 試料
101 試料ステージ
102 ステージ駆動部
103 照明光源
104,104a,104b,104c 複数画素センサ
105 信号処理部
106 全体制御部
107 メカ制御部
108 情報表示部
109 入力操作部
110,407 記憶部
111 回転駆動部
112 垂直駆動部
113 スライド駆動部
116 検出光学系
201,202,501 照明光
203 第一検出光学系
204 第二検出光学系
301 第一結像光学系
302 第二結像光学系
303 回折格子
401,403,406 増幅器
402 バンドパスフィルタ
404a,404b アナログ/デジタル変換器
405 ローパスフィルタ
502 異物
601 照明スポット位置における複数画素センサの画素
701 イメージインテンシファイア
702 光電変換面
703 MCP
704 蛍光板
705 マイクロアレイレンズ
706 散乱光が光電変換された電子
802 ファイバカップリング部
803 マルチコアファイバ終端部
804 マルチコアファイバ始端部断面
805 コア
806 マルチコアファイバ終端断面
807 平行光用レンズ
808 マイクロレンズ
1002 ファイバ終端部
1003 1001aのファイバコア
1004 1001bのファイバコア
1005 凹面鏡
1006 ミラー
1102 光選択用のアイリス
1103 光集光用反射鏡
Claims (23)
- 照射光学系と検出光学系とを有し、基板の欠陥を検査する検査装置において、
前記照射光学系は、
少なくとも1つ以上のLED光源と、
前記LED光源からの光を導く導波部材と、を有することを特徴とする検査装置。 - 請求項1に記載の検査装置において、
前記照射光学系は、
前記LED光源と、前記導波部材との間に、前記LED光源からの光を拡散させる光学素子を有することを特徴とする検査装置。 - 請求項1に記載の検査装置において、
前記導波部材は、ファイバ、またはアイリスであることを特徴とする検査装置。 - 請求項1に記載の検査装置において、
前記導波部材は、マルチモードシングルコアファイバであることを特徴とする検査装置。 - 請求項1に記載の検査装置において、
前記導波部材は、マルチコアファイバであることを特徴とする検査装置。 - 請求項5に記載の検査装置において、
前記マルチコアファイバの前記基板側の端部は、コアが直線状に配列されていることを特徴とする検査装置。 - 請求項1に記載の検査装置において、
第1の波長を有する第1のLED光源と、
第2の波長を有する第2のLED光源と、を有することを特徴とする検査装置。 - 請求項7に記載の検査装置において、
前記照射光学系は、
前記導波部材と前記基板との間に反射光学系を有することを特徴とする検査装置。 - 請求項7に記載の検査装置において、
前記第1のLED光源からの第1の光を導く第1のマルチコアファイバと、
前記第2のLED光源からの第2の光を導く第2のマルチコアファイバと、を有し、
前記第1のマルチコアファイバのコアと、前記第2のマルチコアファイバのコアとは、前記基板側の端部において交互に配置されていることを特徴とする検査装置。 - 請求項7に記載の検査装置において、
前記第1のLED光源からの第1の光を導く第1のマルチコアファイバと、
前記第2のLED光源からの第2の光を導く第2のマルチコアファイバと、を有し、
前記第1のマルチコアファイバのコアと、前記第2のLED光源からの第2の光を導く第2のマルチコアファイバのコアとは、前記基板側の端部においてランダムに配置されていることを特徴とする検査装置。 - 請求項1に記載の検査装置において、
前記照射光学系は、
前記導波部材を通過した光を集光するシリンドリカルレンズを有することを特徴とする検査装置。 - 請求項1に記載の検査装置において、
前記照射光学系は、
前記導波部材を通過した光の偏光を調節する光学素子を有することを特徴とする検査装置。 - 請求項1に記載の検査装置において、
前記基板からの光を検出する検出光学系を有し、
前記検出光学系は結像光学系であり、
前記検出光学系は、複数の画素を有するセンサを有することを特徴とする検査装置。 - 請求項13に記載の検査装置において、
前記検出光学系は、
前記基板からの光を増幅する増幅素子を有し、
前記センサは前記増幅素子によって増幅された光を検出することを特徴とする検査装置。 - 請求項14に記載の検査装置において、
前記検出光学系は、
前記増幅素子を移動させる移動部を有することを特徴とする検査装置。 - 請求項14に記載の検査装置において、
前記検出光学系は、
前記センサと前記増幅素子との間を空間的に分割する光学素子を有することを特徴とする検査装置。 - 基板に光を照射し、前記基板からの光を検出し、前記基板の欠陥を検査する検査方法において、
少なくとも1つ以上のLED光源からの光を平均化して基板に照射し、前記基板を検査することを特徴とする検査方法。 - 請求項17に記載の検査方法において、
前記平均化された光を線状に集光し、前記基板へ照射することを特徴とする検査方法。 - 請求項17に記載の検査方法において、
前記平均化された光の偏光を制御することを特徴とする検査方法。 - 請求項17に記載の検査方法において、
前記平均化された光は第1の波長、及び第2の波長を有することを特徴とする検査方法。 - 請求項17に記載の検査方法において、
前記基板からの光を増幅素子で増幅し、
前記増幅された光を結像し、
前記結像された光を複数の領域で検出することを特徴とする検査方法。 - 請求項21に記載の検査方法において、
前記増幅素子における前記基板からの光の当たる領域を変えることを特徴とする検査方法。 - 請求項21に記載の検査方法において、
前記増幅された光を空間的に分割し、結像することを特徴とする検査方法。
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