WO2014156628A1 - 光照射装置 - Google Patents
光照射装置 Download PDFInfo
- Publication number
- WO2014156628A1 WO2014156628A1 PCT/JP2014/056415 JP2014056415W WO2014156628A1 WO 2014156628 A1 WO2014156628 A1 WO 2014156628A1 JP 2014056415 W JP2014056415 W JP 2014056415W WO 2014156628 A1 WO2014156628 A1 WO 2014156628A1
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- WIPO (PCT)
- Prior art keywords
- light
- processed
- workpiece
- irradiation apparatus
- transmission window
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/42—Stripping or agents therefor
Definitions
- the present invention relates to a light irradiation apparatus. More specifically, the present invention relates to, for example, photo-ashing treatment of a resist in a manufacturing process of a semiconductor or liquid crystal, removal of a resist adhering to a pattern surface of a template in a nanoimprint apparatus, or dry cleaning of a glass substrate for liquid crystal or a silicon wafer.
- the present invention relates to a light irradiation apparatus that is suitably used for smear removal (desmear) processing in processing and printed circuit board manufacturing processes.
- a certain type of light irradiation apparatus using vacuum ultraviolet rays is irradiated with light from an ultraviolet ray emission lamp 55 that emits vacuum ultraviolet rays, for example, in an oxygen atmosphere.
- the object W is irradiated through a light transmission window, and the surface treatment of the object W is performed by ozone and active oxygen generated by vacuum ultraviolet rays.
- a light source unit which is provided with a box-shaped casing 51 having an opening on one side (lower side).
- a flat light transmissive window member 52 constituting a light transmissive window is provided in the opening of the casing 51 so as to block the opening in an airtight manner.
- a plurality of bar-shaped ultraviolet emitting lamps 55 are arranged in a state where the lamp central axes extend in parallel with each other in the same horizontal plane.
- a reflection mirror 56 is provided so as to surround these ultraviolet emission lamps 55.
- Reference numeral 60 in FIG. 8 denotes a processing stage on which the workpiece W is placed.
- a flat workpiece placement surface 61 of the processing stage 60 has a light-transmissive window member 52 in the light source unit 50.
- a frame-shaped spacer member 65 for forming a space of a predetermined size is disposed between the light emitting surface 52a and the workpiece placement surface 61 of the processing stage 60.
- a seal member 66 is disposed on the upper surface of the spacer member 65.
- the light source unit 50 is airtightly disposed on the processing stage 60 through the seal member 66, and a processing chamber S ⁇ b> 2 is formed between the light source unit 50 and the processing stage 60.
- a processing gas supply through-hole 62 and a processing gas discharge through-hole 63 for supplying a processing gas having a predetermined oxygen concentration into the processing chamber S2 are arranged in the plane direction (lamp arrangement). In the direction).
- the workpiece W is disposed on the workpiece placement surface 61 between the processing gas supply through-hole 62 and the processing gas discharge through-hole 63.
- the distance between the light emission surface 52a of the light-transmissive window member 52 and the surface to be processed Wa of the object W to be processed is improved from the viewpoint of improving processing efficiency (productivity).
- the present inventor for example, for a multilayer printed wiring board having a thickness of 0.1 to 0.3 mm, the light emitting surface 52a of the light transmissive window member 52 and the surface to be processed Wa of the object W to be processed.
- a gap size of 0.2 mm for example, it was found that the surface to be processed of the object to be processed could not be uniformly processed.
- the reason is considered as follows. That is, in a multilayer printed wiring board with a small thickness, as shown in FIG. 8, when the insulating resin is laminated at the time of lamination or at the time of heat treatment, the whole is warped or becomes a wavy shape. In some cases, deformation of about 2 mm may occur.
- the distance between the light emitting surface 52a of the light transmissive window member 52 and the surface Wa of the workpiece W cannot be made uniform over the entire area of the surface Wa. For this reason, even if the oxygen concentration in the processing chamber S2 is in a uniform state, the intensity of the vacuum ultraviolet rays reaching from the ultraviolet emitting lamp 55 is distributed, and it is assumed that the workpiece W cannot be processed uniformly. Is done. In addition, since the degree of deformation of the workpiece W varies from individual to individual, it is actually difficult to uniformly treat the workpiece W in this respect.
- the present invention has been made based on the above circumstances, and its purpose is to make the distance between the light exit surface of the light transmission window and the surface to be processed of the object to be processed substantially constant. It is possible to provide a light irradiation device that can be processed uniformly and can uniformly process an object to be processed.
- the light irradiation apparatus of the present invention includes an ultraviolet emission lamp that emits vacuum ultraviolet light to an object to be processed that is placed in an oxygen atmosphere, and is disposed between the object to be processed and the ultraviolet light emission lamp.
- a light irradiation device comprising a light transmission window that transmits vacuum ultraviolet light from an ultraviolet emission lamp
- the light transmission window is disposed in a pressed state against the object to be processed through the object pressing spacer, and the distance between the light emission side surface of the light transmission window and the surface of the object to be processed A gap having a constant size is formed.
- a structure including a pressure adjustment mechanism that maintains the pressure of the atmosphere on the ultraviolet emission lamp side of the light transmission window in a state higher than the pressure of the atmosphere on the workpiece side during operation It is preferable that
- the said light transmission window is contact
- the projecting part is provided, It is preferable that the spacer is constituted by the plurality of protrusions.
- the base portion of the light transmission window has a curved shape that is convex toward the object to be processed.
- the protrusion of the light transmission window causes a gap formed between the light emitting side surface of the base portion of the light transmission window and the surface of the object to be processed. It is preferable that a processing gas supply means for supplying a processing gas containing oxygen having a predetermined concentration is provided.
- the protrusion in the said light transmission window is comprised from the transparent material which permeate
- the protrusion in the light transmission window has a shape in which a cross-sectional area by a cut surface perpendicular to the height direction of the protrusion decreases toward the tip.
- the spacer for pressing the object to be processed is a plurality of wires stretched on the surface of the object to be processed without overlapping each other, or a peripheral edge on the surface of the object to be processed It can consist of the flat piece arrange
- the light irradiation apparatus of the present invention includes a holding device that holds the workpiece, and the holding device is provided with a heating unit that heats the workpiece. It is preferable.
- the object to be processed is pressed by the light transmission window through the spacer for holding the object to be processed, so that the deformation such as the curvature of the object to be processed itself is corrected.
- Processing can be performed in a state where a gap is formed in which the distance between the light transmission window and the workpiece is substantially constant. Therefore, the intensity of the vacuum ultraviolet ray irradiated to the surface of the object to be processed (surface to be processed) can be made substantially uniform, and the concentration of ozone generated by the vacuum ultraviolet ray can be made substantially uniform. As a result, the object to be processed can be processed uniformly.
- the pressure of the atmosphere on the ultraviolet light emitting lamp side of the light transmission window is maintained in a state higher than the pressure of the atmosphere on the object to be processed by the pressure adjusting mechanism, so that the pressure in addition to the weight of the light transmission window. Since the object to be processed is pressed by the pressing force acting on the difference and the deformation of the object to be processed is corrected, the above effect can be obtained more reliably.
- the light transmission window is configured to have a curved shape that protrudes toward the object to be processed, so that the light transmission window is in contact with the object to be processed and forms a flat plate shape.
- the processing gas is configured to flow through a gap between the light emitting side surface of the light transmission window secured by the processing object pressing spacer and the surface of the processing object.
- the oxygen concentration on the surface of the object to be processed can be made substantially constant, so that ozone and active oxygen can be stably generated, and the object to be processed can be stably processed.
- FIG. 4 is a vertical sectional view cut along a plane orthogonal to the flow direction of the processing gas. It is sectional drawing which shows schematically the structure of the holding
- FIG. 1 is an explanatory sectional view schematically showing a configuration of an example of the light irradiation apparatus of the present invention.
- This light irradiation apparatus includes, for example, a holding device including a processing stage 10 having a flat workpiece mounting surface 11 on which a substantially flat workpiece (work) W having flexibility is mounted, And a light source unit 20 disposed on the stage 10 via a frame spacer.
- the light source unit 20 includes a substantially rectangular parallelepiped box-shaped casing 21 having an opening on one side (downward in FIG. 1).
- a light-transmitting window member 30 that constitutes a light-transmitting window that transmits vacuum ultraviolet rays is provided in an airtight manner in the opening of the casing 21, whereby the lamp housing chamber S ⁇ b> 1 sealed inside the casing 21. Is formed.
- bar-shaped ultraviolet emission lamps 25 are arranged side by side so that their central axes extend in parallel with each other in the same horizontal plane.
- a reflection mirror 26 is provided at a position on the back side of the ultraviolet emission lamp 25 in the light irradiation direction of the light source unit 20.
- the casing 21 is provided with an inert gas purge means (not shown) for purging an inert gas such as nitrogen gas.
- the light source unit 20 is disposed such that the lower surface of the casing 21 is in contact with the upper surface of a rectangular frame spacer member 15 disposed on the workpiece placement surface 11 of the processing stage 10 via a seal member 16. Thus, a processing chamber S2 is formed between the light source unit 20 and the processing stage 10.
- the ultraviolet emitting lamp 25 various known lamps can be used as long as they emit vacuum ultraviolet rays.
- a low-pressure mercury lamp that emits vacuum ultraviolet rays of 185 nm, a xenon excimer lamp that emits vacuum ultraviolet rays having a center wavelength of 172 nm, or xenon gas is enclosed in an arc tube.
- a fluorescent excimer lamp in which a phosphor emitting, for example, 190 nm of vacuum ultraviolet rays is applied to the inner surface of the arc tube can be exemplified.
- processing object W in a configuration in which processing is performed by collectively irradiating the processing object W with vacuum ultraviolet rays from the ultraviolet emission lamp 25, the surface of the processing object W (hereinafter referred to as “processing object”). It is also referred to as a “treated surface.”)
- processing object In order to obtain uniformity of the ultraviolet intensity in Wa, it is desirable to use a cylindrical lamp as the ultraviolet emitting lamp 25.
- This light irradiation apparatus includes a processing gas supply means for supplying a processing gas containing oxygen at a predetermined concentration into the processing chamber S2.
- the processing gas supply means will be described in detail.
- the processing stage 10 is formed with a processing gas supply through-hole 12 and a gas discharge through-hole 13 each extending through the processing stage 10 in the thickness direction.
- a processing gas supply source (not shown) is connected to the processing gas supply through hole 12.
- Each of the processing gas supply through-hole 12 and the gas discharge through-hole 13 is configured by, for example, a long hole whose opening shape is an oval extending along the lamp axis direction of the ultraviolet emission lamp 25.
- the processing gas supply through hole 12 and the gas discharge through hole 13 are formed, for example, at positions separated from each other in the arrangement direction of the ultraviolet emission lamps 25.
- the workpiece W is placed on the workpiece placement surface 11 of the processing stage 10 at a position between the processing gas supply through-hole 12 and the gas discharge through-hole 13 in the lamp arrangement direction.
- the oxygen concentration of the processing gas supplied into the processing chamber S2 is preferably 50% or more, and more preferably 80% or more. As a result, the amount of ozone and active oxygen generated by vacuum ultraviolet rays can be increased, and the intended treatment can be performed reliably.
- the light transmissive window member 30 is disposed in a pressed state against the workpiece W via the workpiece pressing spacer, and the light transmissive window member 30 emits light.
- a gap is formed in which the distance h between the surface on the side and the surface Wa of the workpiece W is a constant size.
- the light transmissive window member 30 has a flat base portion 31 having a certain thickness, and a light emitting side surface of the base portion 31 (hereinafter referred to as a “light emitting surface”). 32 and a plurality of projections 35 provided integrally with 32.
- each protrusion 35 of the light transmissive window member 30 is disposed in contact with the processing surface Wa of the object W to be processed in a pressed state. It functions as a workpiece pressing spacer having a constant distance h between the light emitting surface 32 of the workpiece and the processing surface Wa of the workpiece W.
- the distance h between the light emitting surface 32 of the base portion 31 and the surface Wa of the workpiece W is preferably, for example, 1 mm or less, and particularly preferably 0.5 mm or less. .
- ozone and active oxygen can be stably generated, and the vacuum ultraviolet rays that reach the surface Wa of the workpiece W can be set to a sufficiently large intensity (light quantity).
- Each protrusion 35 is, for example, a columnar shape having the same height, and is provided in a state of being scattered on the light emitting surface 32 of the base portion 31.
- the protrusions 35 are preferably provided such that the total area of the front end surfaces of the protrusions 35 is 20% or less of the area of the light emitting surface 32 of the base body 31. Moreover, it is preferable that the area of the front end surface of each protrusion 35 is 20% or less of the total area of the front end surface. With such a configuration, it is possible to reduce the degree of blocking of vacuum ultraviolet rays by the protrusion 35 and the inhibition of the flow of the processing gas.
- the formation pattern of the protrusions 35 is not particularly limited.
- a plurality of protrusions 35 may be arranged in a grid pattern with a predetermined pitch (center distance).
- a large number of protrusions 35 are formed in the area corresponding to the non-processing area. It may be in an unevenly distributed state.
- a gap is formed between the protrusions 35 communicating from the processing gas supply through hole 12 to the gas discharge through hole 13.
- a plurality of protrusions 35 are arranged.
- the height of the protrusion 35 is, for example, 1 mm or less, particularly 0 in relation to the size of the distance h between the light emitting surface 32 of the base portion 31 and the surface Wa of the workpiece W. .5 mm or less is preferable.
- substrate part 31 of the light transmissive window member 30, as above-mentioned it has the permeability
- quartz glass can be used.
- various materials can be used as the material constituting the protrusion 35 as long as they have resistance to vacuum ultraviolet rays and ozone. It is preferable to use, for example, quartz glass having light transparency with respect to vacuum ultraviolet light in that it is possible to suppress vacuum ultraviolet light from being blocked by the presence of 35.
- the light transmissive window member 30 can be manufactured by, for example, a photolithography method. Specifically, in a state where one surface of the flat light transmitting window forming material is masked, the protrusion 35 is formed by etching with, for example, hydrogen fluoride water, and thus the light transmitting window member shown in FIG. 30 can be obtained. Further, a projection 35 is formed by masking the projection forming portion on one surface of the flat light transmitting window forming material and then sanding the one surface by sandblasting or grinding, thereby forming the light transmitting property shown in FIG. The window member 30 can also be produced.
- glass beads are arranged on one surface of a flat light transmission window forming material made of, for example, quartz glass, and the projections 35 are formed by welding the glass beads, for example, by heating in an electric furnace.
- the light transmissive window member 30 shown in FIG. 1 can be produced.
- a pressure adjustment mechanism that maintains the pressure of the atmosphere on the ultraviolet emission lamp 25 side of the light transmissive window member 30 in a state higher than the pressure of the atmosphere on the workpiece W side during operation. It is preferable that the configuration is provided.
- the pressure adjusting mechanism is configured so that the supply amount of the inert gas by the inert gas purge unit and the processing gas by the processing gas supply unit are maintained so that the pressure in the lamp storage chamber S1 is maintained higher than the pressure in the processing chamber S2. It has a function to adjust the supply amount.
- the light transmissive window member 30 is moved from the workpiece W by the pressure difference. Since force acts in the separating direction, the protrusion 35 of the light transmissive window member 30 may not be brought into contact with the surface Wa of the workpiece W in a pressed state.
- the pressure (gauge pressure) in the processing chamber S2 by supplying the processing gas is, for example, 300 Pa or more.
- the pressure (gauge pressure) in the lamp housing chamber S1 by purging with an inert gas is, for example, 400 Pa or more.
- the pressure difference between the lamp housing chamber S1 and the processing chamber S2 is preferably 100 Pa or more, for example.
- the processing stage 10 is provided with a heating means (not shown) for heating the workpiece W.
- a heating means not shown for heating the workpiece W.
- the processing gas can be supplied into the processing chamber S2 in a heated state, the processing object W can also be obtained by circulating the processing gas along the processing surface Wa of the processing object W. The temperature of the surface Wa to be processed can be raised, and the above effect can be obtained more reliably.
- the heating condition by the heating means is preferably such that the temperature of the surface Wa of the workpiece W is, for example, 80 ° C. or higher and 340 ° C. or lower, more preferably 80 ° C. or higher and 200 ° C. or lower. It is a condition.
- the workpiece W is placed on the workpiece placement surface 11 of the treatment stage 10 at a position between the treatment gas supply through hole 12 and the gas discharge through hole 13. 2, the light source unit 20 is disposed on the processing stage 10 via the spacer member 15 and the seal member 16.
- the protrusions 35 of the light transmissive window member 30 are in contact with the surface Wa of the workpiece W in a pressed state, respectively, and the surface Wa of the workpiece W and the base of the light transmissive window member 30.
- the distance h between the light emitting surface 32 of the part 31 is set to a constant size.
- an inert gas whose supply amount is appropriately controlled is purged into the lamp housing chamber S1 by the pressure adjustment mechanism, and a processing gas whose supply amount is appropriately controlled is used for processing the processing stage 10.
- the temperature is raised by the heating means and supplied into the processing chamber S2.
- the pressure in the lamp housing chamber S1 is maintained higher than the pressure in the processing chamber S2.
- the pressing force of the light transmissive window member 30 against the workpiece W is, for example, about 1000 N / m 2 .
- the processing gas supplied into the processing chamber S ⁇ b> 2 is generated by the projection 35 of the light transmissive window member 30 and the light emitting surface 32 of the base portion 31 of the light transmissive window member 30 and the surface Wa to be processed of the workpiece W. Is distributed along the light emitting surface 32 and the surface Wa to be processed in a gap formed between the two. Then, by turning on each ultraviolet ray emission lamp 25, vacuum ultraviolet rays from the ultraviolet ray emission lamp 25 are irradiated toward the workpiece W through the light transmissive window member 30. Thereby, the processing of the processing surface Wa of the processing object W is performed by the vacuum ultraviolet rays reaching the processing surface Wa of the processing target W, and ozone and active oxygen generated by the vacuum ultraviolet rays.
- each protrusion 35 of the light transmissive window member 30 is in contact with the tip surface Wa of the workpiece W in a pressed state. Therefore, according to the light irradiation apparatus having the above configuration, the deformation such as the curvature of the workpiece W itself is corrected, whereby the light emitting surface 32 of the base portion 31 of the light transmissive window member 30 and the workpiece W are corrected.
- the processing can be performed in a state in which the distance h between the surface to be processed Wa is constant over the entire surface Wa of the object to be processed W.
- the intensity of the vacuum ultraviolet rays irradiated to the surface Wa of the workpiece W can be made substantially uniform, and the concentration of ozone generated by the vacuum ultraviolet rays can be made substantially uniform, As a result, the workpiece W can be processed uniformly.
- the gap formed between the light emitting surface 32 of the base portion 31 of the light transmissive window member 30 and the surface to be processed Wa of the workpiece W by the protrusion 35 of the light transmissive window member 30 is used for processing. Since the gas is circulated, the oxygen concentration on the surface Wa of the workpiece W can be made substantially constant, so that ozone and active oxygen can be stably generated and The processing of the workpiece W can be performed stably.
- the pressure adjustment mechanism maintains the pressure in the lamp storage chamber S1 higher than the pressure in the processing chamber S2, so that in addition to the pressing force due to the weight of the light transmissive window member 30, the pressure difference Since the workpiece W is pressed by the pressing force due to the above and the deformation of the workpiece W is corrected, the above effect can be obtained more reliably.
- the light irradiation apparatus illustrated in FIG. 1 is configured as a so-called batch irradiation type, but may be configured as a scan type as illustrated in FIG. 2.
- the holding device 40 that holds the workpiece W, the light source unit 20a that includes the ultraviolet emission lamp 25a, and one of the light source unit 20a and the holding device 40 is set in a horizontal direction relative to the other.
- Driving means (not shown) for movement.
- the holding device 40 is configured to be moved in the horizontal direction with respect to the light source unit 20a by the driving means.
- the moving direction of the holding device 40 is indicated by a white arrow.
- a light transmission window holding frame 41 defining a processing chamber S2 having an opening opening upward is detachably attached to a processing stage 10 having a flat workpiece placement surface 11.
- the light transmissive window member 30 constituting the light transmissive window is provided so as to airtightly close the opening of the light transmissive window holding frame 41.
- a processing gas supply through-hole 12 for supplying a processing gas having a predetermined oxygen concentration into the processing chamber S 2 and a gas discharge through-hole 13 are mutually connected in the moving direction (conveying direction) of the holding device 40. It is formed at a spaced position.
- the workpiece W is disposed at a position between the processing gas supply through-hole 12 and the gas discharge through-hole 13.
- the light transmissive window member 30 has, for example, the same structure as that of the light irradiation device shown in FIG. 1 and will not be described in detail.
- the light source unit 20a includes a casing 21a that is open at one side (downward in the illustrated example), and an ultraviolet ray emitting lamp 25a that is disposed in such a manner that the lamp central axis extends horizontally in the casing 21a.
- the casing 21a is provided with a gas flow path pipe 22 for circulating an inert gas (for example, nitrogen gas N 2 ) in the casing 21a.
- an inert gas for example, nitrogen gas N 2
- this light irradiation device by adjusting the moving speed of the holding device 40, it is possible to optimize the irradiation exposure amount to the workpiece W of vacuum ultraviolet rays.
- Such a scan-type light irradiation device can be configured to include a plurality of holding devices (processing stages).
- the object to be processed held by one holding device is attached to the object to be processed in another holding device in a separate step in advance before performing the irradiation process of the vacuum ultraviolet ray by the light source unit. Since the processing gas can be supplied, continuous ultraviolet irradiation processing can be performed on a plurality of objects to be processed, and productivity can be improved.
- a light transmissive window is not limited to the thing shown in FIG. 1 and FIG.
- the protrusion in the light transmissive window member may have a configuration in which the cross-sectional area of the cut surface perpendicular to the height direction of the protrusion decreases toward the tip.
- the projecting portion 35a of the light transmissive window member 30a is spherical or hemispherical, or as shown in FIG.
- the projecting portion 35b of the window member 30b may have a conical shape (for example, a conical shape).
- the tips of the projections 35a and 35b are substantially point-contacted with the surface Wa of the workpiece W, so that the projections 35a and 35b and the workpiece W are processed.
- the area that can be processed by vacuum ultraviolet rays, ozone, or the like (effective processing area) on the surface Wa can be increased.
- the light transmission window does not need to be entirely constituted by a flat light transmission window member.
- the whole light transmission window may have a configuration curved in an arc shape.
- the light transmissive window member 30c is pressed against the surface Wa to be processed of the workpiece W on the convex surface (light emitting surface) 32 of the base portion 31a curved in an arc shape having a constant thickness t.
- a plurality of protrusions 35 that are in contact with each other are provided.
- the light transmissive window member 30c has a flat plate shape in contact with the workpiece W as indicated by a broken line in FIG.
- Such a light transmissive window member 30c is formed by placing a light transmissive window forming material having protrusions on the surface of a planar base portion on, for example, a carbon mold that protrudes upward, under predetermined heating conditions. It can be obtained by performing a heat treatment.
- the workpiece W can be pressed with a strong force by having a curved shape that is convex toward the workpiece W side. That is, for example, when a flat light transmissive window member is pressed against the workpiece W, both are brought into close contact with each other, but a processing gas is supplied between the workpiece W and the light transmissive window member. Accordingly, the pressure of the processing gas is applied to the light transmissive window member.
- the pressure of the processing gas is equal to or greater than the pressure of the atmosphere on the lamp side of the light transmissive window member (lamp housing chamber), the light transmissive window member is usually a peripheral portion thereof.
- the central portion of the light transmissive window member is convex toward the lamp. For this reason, the effect of pressing the object to be processed by the light transmissive window member is reduced or cannot be obtained.
- the light transmissive window member 30c has a curved shape that protrudes toward the workpiece W, the light transmissive window can provide a pressing force that can resist the gas pressure that acts by supplying the processing gas. Since the member 30c itself has, the workpiece W can be reliably pressed down. Therefore, according to the light transmissive window member 30c having such a configuration, the above-described effect can be reliably obtained.
- the object pressing spacer interposed between the light transmission window and the object to be processed is not necessarily constituted by a part of the light transmission window.
- the light transmission window And a separate member.
- FIG. 5 is sectional drawing which shows schematically the structure of the holding
- FIG. 4B is a vertical sectional view cut along a plane orthogonal to the flow direction of the processing gas.
- a plurality of wire rods 70 that constitute a workpiece pressing spacer are disposed on the surface (processing surface) Wa of the workpiece W disposed on the processing stage 10a.
- each wire 70 is disposed at a position spaced from each other. It arrange
- Each wire rod 70 can be constituted by a metal wire, for example.
- the wire diameter of the wire 70 is, for example, ⁇ 1 mm or less in relation to the size of the distance h between the light emitting surface 46 of the light-transmissive window member 45 and the surface Wa to be processed W.
- the diameter is preferably 0.5 mm or less.
- the method for holding the wire is not particularly limited.
- a structure in which the wire 70 is held by a common wire holding member 75 may be configured to hold the structure.
- the wire holding member 75 in this example is formed by forming an outwardly projecting flange 77 on the other opening edge of a pair of peripheral walls facing each other in a frame 76 that opens in the vertical direction.
- a plurality of wires 70 are stretched in one opening of the frame body 76.
- the flange part 77 of the wire holding member 75 is clamped and fixed by the base 43 and the light transmission window holding frame 41a. Thereby, the flat light transmission window member 45 constituting the light transmission window is formed. It arrange
- the wire 70 need not be stretched so as to extend linearly, and may be curved, for example, in the same plane so as not to hinder the flow of the processing gas. Further, the number of the wires 70 is not particularly limited.
- the workpiece pressing spacer may be formed of a flat plate piece.
- work pressing members 80a and 80b are arranged around the processing stage 10a.
- Each work pressing member 80a, 80b is locked to a vertical plate piece 81 positioned in contact with the peripheral side surface of the processing stage 10a and a peripheral portion of the surface (surface to be processed) Wa of the workpiece W.
- It has an “L” shape with a horizontal plate piece 82.
- the thickness of the horizontal plate piece 82 in each workpiece pressing member 80a, 80b is the distance h between the light exit surface 46 of the light-transmissive window member 45 and the surface Wa to be processed W.
- ⁇ 1 mm or less particularly ⁇ 0.5 mm or less is preferable.
- a plurality of cutout portions 83 for processing gas flow are formed on the horizontal plate piece 82 apart from each other.
- the tongue-shaped pressing portion 84 is formed in a comb-teeth shape.
- Each of the work pressing members 80a and 80b is arranged so that the flat plate-like light transmissive window member 45 is pressed against the workpiece W so that the horizontal plate piece 82 and the light transmissive window member 45 and the processing stage are disposed. 10a and is held.
- the horizontal plate piece 82 in the work pressing members 80a and 80b functions as a workpiece pressing spacer, and the distance between the light emitting surface 46 of the light transmissive window member 45 and the processing surface Wa of the workpiece W is shown. A gap having a constant size is formed.
- the light irradiation apparatus of the present invention when replacing the object to be processed, it is necessary to separate the light transmission window from the object to be processed.
- the apparatus may further include driving means capable of driving one of the light source unit 20 and the processing stage 10 in the vertical direction relative to the other.
- driving means capable of driving one of the light source unit 20 and the processing stage 10 in the vertical direction relative to the other.
- the workpiece W can be easily replaced, and the projection 35 of the light transmissive window member 30 can be reliably secured to the workpiece surface of the workpiece W by the driving means.
- the distance (gap thickness) between the light emitting surface 32 of the base portion 31 of the light-transmissive window member 30 and the surface to be processed Wa of the object to be processed W can be surely fixed. It can be a size.
- Ultraviolet emission lamp (25) Xenon excimer lamp with a light emission length of 700 mm and an outer diameter of ⁇ 40 Number of ultraviolet emission lamps: 5 Input power: 500 W [Light-transmissive window member (30)]
- Protrusion material quartz glass Distance between the light emitting surface of the base portion of the light transmissive window member and the surface of the processing stage to be processed: 0.4 mm (calculated base portion of the light transmissive window member) The distance between the light exit surface of the workpiece and the treated surface of the workpiece: 0.2 mm) Pressing force of the light transmissive window member to the object to be processed: about 1000 N / m 2 [Processing gas supply means] Processing gas: oxygen concentration 100% Supply amount of processing gas: 10 l / min Pressure
- a several via hole is formed in the printed circuit board material (thickness 0.2mm) in which the insulating layer whose thickness is 0.1mm is formed on the copper foil whose thickness is 0.1mm. What was used.
- the dimensions of this printed board material are 500 mm ⁇ 500 mm, and the hole diameter of the via hole is ⁇ 0.05 mm.
- the smear remains in the via hole located in the concave portion of the undulation of the printed circuit board material, and the size of the gap in the region is larger than the gap in the other region, so that vacuum ultraviolet rays and ozone (or active oxygen) It is presumed that the action of was not fully obtained.
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- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Cleaning Or Drying Semiconductors (AREA)
- Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)
- Cleaning In General (AREA)
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
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Abstract
Description
前記光透過窓が被処理物押さえ用スペーサを介して前記被処理物に対して押圧状態で配置されて、当該光透過窓の光出射側の表面と当該被処理物の表面との間の距離が一定の大きさとされる間隙が形成されることを特徴とする。
前記スペーサが当該複数の突部により構成されていることが好ましい。
また、前記光透過窓における突部は、当該突部の高さ方向に垂直な切断面による断面積が先端に向かうに従って小さくなる形状を有する構成とされていることが好ましい。
図1は、本発明の光照射装置の一例における構成を概略的に示す説明用断面図である。この光照射装置は、例えば可撓性を有する略平板状の被処理物(ワーク)Wが載置される平坦な被処理物載置面11を有する処理ステージ10を備えた保持装置と、処理ステージ10上に枠状スペーサを介して配置された光源ユニット20とを備えている。
図1に示す光照射装置のように、例えば紫外線出射ランプ25からの真空紫外線を被処理物Wに一括照射して処理を行う構成のものにおいては、被処理物Wの表面(以下、「被処理面」ともいう。)Waにおける紫外線強度の均一性を得るために、紫外線出射ランプ25としては、円筒型のものを用いることが望ましい。
処理用ガス供給手段について具体的に説明すると、処理ステージ10には、各々処理ステージ10の厚さ方向に貫通して延びる処理用ガス供給用貫通孔12およびガス排出用貫通孔13が形成されており、処理用ガス供給用貫通孔12には、図示しない処理用ガス供給源が接続されている。処理用ガス供給用貫通孔12およびガス排出用貫通孔13は、いずれも、例えば開口形状が紫外線出射ランプ25のランプ軸方向に沿って延びる長円形とされた長孔により構成されている。そして、処理用ガス供給用貫通孔12およびガス排出用貫通孔13は、例えば紫外線出射ランプ25の配列方向に互いに離間した位置に形成されている。ここに、被処理物Wは、処理ステージ10の被処理物載置面11上において、ランプの配列方向における、処理用ガス供給用貫通孔12とガス排出用貫通孔13との間の位置に配置される。
処理室S2内に供給される処理用ガスの酸素濃度は、例えば50%以上であることが好ましく、80%以上であることがより好ましい。これにより、真空紫外線により生成されるオゾンおよび活性酸素の量を多くすることができて所期の処理を確実に行うことができる。
突部35は、各突部35の先端面の面積の合計が基体部31の光出射面32の面積の20%以下の大きさとなるよう設けられていることが好ましい。また、各突部35の先端面の面積は、先端面の合計面積の20%以下の大きさとされていることが好ましい。このような構成とされていることにより、突部35による真空紫外線の遮光や処理用ガスの流通の阻害の程度を小さく抑制することができる。
また、突部35が基体部31と別部材により構成される場合において、突部35を構成する材料としては、真空紫外線やオゾンへの耐性があれば種々の材料を用いることできるが、突部35の存在によって真空紫外光が遮光されることを抑制することができる点で、真空紫外線について光透過性を有する例えば石英ガラスを用いることが好ましい。
また、平板状の光透過窓形成材料の一面における突部形成箇所をマスクして、サンドブラスト処理や研削加工によって当該一面を削ることにより突部35を形成し、これにより図1に示す光透過性窓部材30を作製することもできる。さらにまた、例えば石英ガラスよりなる平板状の光透過窓形成材料の一面上に例えばガラスビーズなどを配置し、例えば電気炉で加熱することによりガラスビーズを溶着させて突部35を形成することにより、図1に示す光透過性窓部材30を作製することができる。
加熱手段による加熱条件は、被処理物Wの被処理面Waの温度が、例えば80℃以上、340℃以下となる条件であることが好ましく、より好ましくは、80℃以上、200℃以下となる条件である。
そして、各紫外線出射ランプ25が点灯されることにより、当該紫外線出射ランプ25からの真空紫外線が光透過性窓部材30を介して被処理物Wに向かって照射される。これにより、被処理物Wの被処理面Waに到達する真空紫外線、および、真空紫外線により生成されるオゾンおよび活性酸素によって、被処理物Wの被処理面Waの処理が行われる。
この光照射装置は、被処理物Wを保持する保持装置40と、紫外線出射ランプ25aを備えた光源ユニット20aと、光源ユニット20aおよび保持装置40の一方を他方に対して相対的に水平方向に移動させる駆動手段(図示せず)とを備えている。この例においては、例えば保持装置40が駆動手段によって光源ユニット20aに対して水平方向に移動される構成とされている。保持装置40の移動方向を白抜きの矢印で示してある。
光透過性窓部材30は、例えば図1に示す光照射装置のものと同一の構成を有するものが用いられており、具体的な説明を省略する。
このようなスキャンタイプの光照射装置においては、高い出力を得るために、紫外線出射ランプ25aとして、例えば特定方向に光を照射する角型のエキシマランプを用いることが望ましい。
例えば、光透過性窓部材における突部は、先端に向かうに従って突部の高さ方向に垂直な切断面による断面積が小さくなる形状を有する構成とすることができる。具体的には、図3(a)に示すように、光透過性窓部材30aにおける突部35aが球状または半球状とされた構成、あるいは、図3(b)に示すように、光透過性窓部材30bにおける突部35bが錐状(例えば円錐状)とされた構成とされていてもよい。このような構成の突部35a,35bにおいては、突部35a,35bの先端部が被処理物Wの被処理面Waに実質上点接触されるので、突部35a,35bと被処理物Wとの接触面積を小さくすることができ、被処理面Waにおける真空紫外線およびオゾン等によって処理可能な領域(有効処理領域)を大きくすることができる。
このような光透過性窓部材30cは、平面状の基体部の表面に突部を形成した光透過窓形成材料を、例えば上方に凸となるカーボンの型に載置し、所定の加熱条件で加熱処理を行うことにより得ることができる。
この光照射装置における保持装置40aにおいては、処理ステージ10a上に配置された被処理物Wの表面(被処理面)Wa上に、被処理物押さえ用スペーサを構成する複数本の線材70が互いに重なることなく配置されており、光透過窓を構成する平板状の光透過性窓部材45が線材70を介して被処理物Wに対して押圧状態で配置されている。従って、各々の線材70によって、光透過性窓部材45の光出射面46と被処理物Wの被処理面Waとの間の距離hが一定の大きさとされている。各々の線材70は、両端部が光透過性窓部材45と光透過窓保持枠41aとによって挟持されて保持されており、この例では、各々の線材70は互いに離間した位置において処理用ガスの流通方向(図5(a)において左右方向)に沿って平行に延びるよう配置されている。図5(a)、(b)において、42は窓固定部材、43は基台である。
線材70の線径は、上述したように、光透過性窓部材45の光出射面46と被処理物Wの被処理面Waとの間の距離hの大きさとの関係において、例えばφ1mm以下、特にφ0.5mm以下であることが好ましい。
各々のワーク押さえ部材80a,80bにおける水平板片82の厚みは、上述したように、光透過性窓部材45の光出射面46と被処理物Wの被処理面Waとの間の距離hの大きさとの関係において、例えばφ1mm以下、特にφ0.5mm以下であることが好ましい。
<実験例1>
図1に示す構成を参照して、下記の仕様を有する本発明に係る光照射装置を作製した。[処理ステージ(10)]
寸法:650×650mm、厚さ20mm
材質:アルミニウム
〔加熱手段〕
被処理物の被処理面の温度が150℃となる加熱条件で動作する抵抗発熱ヒータ
[光源ユニット(20)]
紫外線出射ランプ(25):発光長が700mm、外径がφ40であるキセノンエキシマランプ
紫外線出射ランプの数:5本
入力電力:500W
〔光透過性窓部材(30)〕
基体部の寸法:550×550mm、厚さ7mm
基体部の材質:石英ガラス
突部の寸法:φ0.3mm、高さ0.2mm(円柱状)
突部の形成パターン:正方格子状、ピッチ50mm
突部の材質:石英ガラス
光透過性窓部材の基体部の光出射面と処理ステージの被処理物載面との間の距離:0.4mm(計算上の、光透過性窓部材の基体部の光出射面と被処理物の被処理面との間の距離:0.2mm)
光透過性窓部材の被処理物に対する押圧力:約1000N/m2
〔処理用ガス供給手段〕
処理用ガス:酸素濃度100%
処理用ガスの供給量:10リットル/min
処理室内の圧力(ゲージ圧):300Pa
〔不活性ガス供給手段〕
不活性ガス:窒素ガス
不活性ガスの供給量:約100リットル/min
ランプ収容室内の圧力(ゲージ圧):400Pa
図8に示す構成を参照して、光透過窓として、突部を有さない平板状の光透過性窓部材を用いたことの他は、実験例1において作製した光照射装置と同一の構成を有する比較用の光照射装置を作製した。
この比較用の光照射装置においては、光透過性窓部材の光出射面と処理ステージの被処理物載面との間の距離を2.2mm(計算上、光透過性窓部材の光出射面とプリント基板材料の被処理面との間の距離が0.2mm)とした。
11 被処理物載置面
12 処理用ガス供給用貫通孔
13 ガス排出用貫通孔
15 スペーサ部材
16 シール部材
20,20a 光源ユニット
21,21a ケーシング
22 ガス流路管
25,25a 紫外線出射ランプ
26 反射ミラー
30,30a,30b,30c 光透過性窓部材
31,31a 基体部
32 光出射面
35,35a,35b 突部
40, 40a 保持装置
41,41a 光透過窓保持枠
42 窓固定部材
43 基台
45 光透過性窓部材
46 光出射面
50 光源ユニット
51 ケーシング
52 光透過性窓部材
52a 光出射面
55 紫外線出射ランプ
56 反射ミラー
60 処理ステージ
61 被処理物載置面
62 処理用ガス供給用貫通孔
63 処理用ガス排出用貫通孔
65 スペーサ部材
66 シール部材
70 線材
75 線材保持部材
76 枠体
77 フランジ部
80a,80b ワーク押さえ部材
81 垂直板片
82 水平板片
83 切り欠き部
84 押さえ部
W 被処理物(ワーク)
Wa 被処理面
S1 ランプ収容室
S2 処理室
h 光出射面と被処理面との距離
Claims (10)
- 酸素雰囲気下に配置される被処理物に対して真空紫外光を出射する紫外線出射ランプと、前記被処理物と前記紫外線出射ランプとの間に配置された、当該紫外線出射ランプからの真空紫外光を透過する光透過窓とを備えた光照射装置において、
前記光透過窓が被処理物押さえ用スペーサを介して前記被処理物に対して押圧状態で配置されて、当該光透過窓の光出射側の表面と当該被処理物の表面との間の距離が一定の大きさとされる間隙が形成されることを特徴とする光照射装置。 - 動作時において、前記光透過窓の紫外線出射ランプ側の雰囲気の圧力を、前記被処理物側の雰囲気の圧力より高い状態に維持する圧力調整機構を備えていることを特徴とする請求項1に記載の光照射装置。
- 前記光透過窓は、一定の大きさの厚みを有する基体部の光出射側の表面に、前記被処理物の表面に押圧状態で当接される複数の突部が設けられて構成されており、
前記被処理物押さえ用スペーサが当該複数の突部により構成されていることを特徴とする請求項1または請求項2に記載の光照射装置。 - 前記光透過窓の基体部は、前記被処理物側に向かって凸となる湾曲した形態を有することを特徴とする請求項3に記載の光照射装置。
- 前記光透過窓の突部によって、当該光透過窓の基体部における光出射側の表面と、被処理物の表面との間に形成されるギャップに、所定濃度の酸素を含む処理用ガスを供給する処理用ガス供給手段を備えていることを特徴とする請求項3に記載の光照射装置。
- 前記光透過窓における突部は、前記真空紫外光を透過させる光透過性材料からなることを特徴とする請求項3に記載の光照射装置。
- 前記光透過窓における突部は、当該突部の高さ方向に垂直な切断面による断面積が先端に向かうに従って小さくなる形状を有することを特徴とする請求項3に記載の光照射装置。
- 前記被処理物押さえ用スペーサは、互いに重なることなく前記被処理物の表面に張設された複数の線材よりなることを特徴とする請求項1または請求項2に記載の光照射装置。
- 前記被処理物押さえ用スペーサは、前記被処理物の表面における周縁部に配設された平板片よりなることを特徴とする請求項1または請求項2に記載の光照射装置。
- 前記被処理物を保持する保持装置を備えており、当該保持装置には、前記被処理物を加熱する加熱手段が設けられていることを特徴とする請求項1または請求項2に記載の光照射装置。
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Also Published As
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CN105074882B (zh) | 2018-04-06 |
US20160018736A1 (en) | 2016-01-21 |
JP5861696B2 (ja) | 2016-02-16 |
JP2014209548A (ja) | 2014-11-06 |
KR101689987B1 (ko) | 2016-12-26 |
KR20150122723A (ko) | 2015-11-02 |
US9678428B2 (en) | 2017-06-13 |
CN105074882A (zh) | 2015-11-18 |
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