WO2009128219A1 - Appareil de traitement de substrat en matériau fragile et procédé de découpe de substrat en matériau fragile - Google Patents

Appareil de traitement de substrat en matériau fragile et procédé de découpe de substrat en matériau fragile Download PDF

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Publication number
WO2009128219A1
WO2009128219A1 PCT/JP2009/001606 JP2009001606W WO2009128219A1 WO 2009128219 A1 WO2009128219 A1 WO 2009128219A1 JP 2009001606 W JP2009001606 W JP 2009001606W WO 2009128219 A1 WO2009128219 A1 WO 2009128219A1
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WO
WIPO (PCT)
Prior art keywords
laser beam
processing line
brittle material
material substrate
cooling
Prior art date
Application number
PCT/JP2009/001606
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English (en)
Japanese (ja)
Inventor
亀井政行
Original Assignee
株式会社リンクスタージャパン
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2008105646A external-priority patent/JP5074272B2/ja
Priority claimed from JP2008105649A external-priority patent/JP2009255114A/ja
Priority claimed from JP2008105651A external-priority patent/JP5220465B2/ja
Application filed by 株式会社リンクスタージャパン filed Critical 株式会社リンクスタージャパン
Publication of WO2009128219A1 publication Critical patent/WO2009128219A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B33/00—Severing cooled glass
    • C03B33/09—Severing cooled glass by thermal shock
    • C03B33/091—Severing cooled glass by thermal shock using at least one focussed radiation beam, e.g. laser beam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/04—Automatically aligning, aiming or focusing the laser beam, e.g. using the back-scattered light
    • B23K26/042—Automatically aligning the laser beam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
    • B23K26/0648—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
    • B23K26/0652—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising prisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/073—Shaping the laser spot
    • B23K26/0736—Shaping the laser spot into an oval shape, e.g. elliptic shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
    • B23K26/146—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor the fluid stream containing a liquid
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

Definitions

  • the present invention relates to a cutting and scribing technique for brittle material substrates including glass substrates and semiconductor substrates.
  • An FPD flat panel display
  • the size of FPD ranges from several tens of inches used for large LCD TVs to several inches such as mobile phone terminals, and the thickness of FPDs varies from several mm used for large LCD TVs to mobile phones. Wide range of about 0.5mm used for terminals.
  • a laser beam is irradiated to a point on the planned processing line while being moved along the planned processing line on the glass substrate, and then heated locally, and then cooled by spraying a cooling medium in the vicinity of the heating region.
  • thermal stress is generated in the direction of pulling the glass substrate perpendicular to the planned processing line according to the heat distribution on the laser substrate, and the scribe line along the planned processing line grows on the glass substrate. .
  • mechanical stress is applied to the glass substrate by the breaker device, and the glass substrate is cleaved along the scribe line.
  • the scribe line is penetrated to the deep part in the thickness direction of the glass substrate, and the full cut that cleaves the glass substrate without breaking by the breaker device (Also called full body cut).
  • a full cut using a laser is very useful from the viewpoint of mass productivity because it requires no post-processing by a breaker device and can cleave the glass substrate in a single process.
  • the heating condition by the laser is extremely important as compared with the case where a scribe line is simply formed.
  • the heating condition by the laser depends on the intensity distribution (beam cross-sectional profile) of the laser beam irradiation region (also referred to as an irradiation spot) in addition to the laser energy. That is, if the state of the laser beam is not optimized, full cutting cannot be performed, and even if full cutting is possible, the yield is low and the quality of the cross section of the glass is deteriorated.
  • Patent Document 1 discloses a technique for patterning a laser beam pattern so as to have a plurality of peaks in a direction along a planned scribe line (processed line).
  • a plurality of peaks are formed by superimposing a plurality of beams, and thus there is a problem that an optimum heating state for full cut cannot be realized.
  • the present invention has been made in view of the above problems, and one of the exemplary purposes of one aspect thereof is a processing technique for fully cutting a brittle material substrate such as a glass substrate with high quality or high yield. Is in the provision of.
  • the main purpose is to cool the glass substrate to a low temperature. For example, by ejecting a large amount of liquid droplets over a large area using a two-fluid nozzle, Was cooling.
  • the present invention has been made in view of the problems related to the present invention, and an exemplary object of an aspect thereof is a processing technique for fully cutting a brittle material substrate such as a glass substrate with high quality or high yield. Is in the provision of.
  • the heating condition by the laser is more important than when the scribe line is simply formed.
  • the output stabilization mechanism of the laser oscillator is used, and the energy of the laser beam is kept constant regardless of the state of the glass substrate.
  • the coefficient of thermal diffusion changes according to the processing position of the object to be processed, or the temperature of the laser irradiation region changes as the cooling conditions are changed by the cooling device. .
  • the present invention has been made in view of the above problems, and one of the exemplary purposes of one aspect thereof is a processing technique for fully cutting a brittle material substrate such as a glass substrate with high quality or high yield. Is in the provision of.
  • An aspect of the present invention relates to a processing apparatus that cuts a brittle material substrate that is a processing target along a planned processing line.
  • This processing apparatus includes a laser irradiation apparatus for patterning a laser beam into a long and narrow shape with a planned processing line in the longitudinal direction, and irradiating the patterned laser beam on the processing target line of the brittle material substrate, and in the vicinity of the laser irradiation region.
  • a cooling device for injecting a cooling medium to cool a predetermined cooling region on the processing line, and a stage for moving the brittle material substrate relative to the laser irradiation region and the cooling region in the direction of the processing line.
  • the laser irradiation apparatus includes a pair of axicon lenses provided on the laser beam path and arranged such that their vertices face each other or face each other, and an irradiation optical system that focuses or diverges the laser beam. ,including.
  • the laser beam can be patterned to have an intensity profile having a ring-like peak.
  • a laser beam having two peaks in the direction along the planned processing line is formed by patterning a single beam instead of superimposing a plurality of laser beams.
  • the intensity distribution in the direction perpendicular to the planned processing line can be made into a shape suitable for full cut, which is different from the profile obtained by simply condensing the beam from the laser oscillator.
  • the “processing apparatus” includes not only an apparatus capable of full-cutting a brittle material substrate, but also a scribe apparatus for forming a scribe line on the brittle material substrate on the premise of a post-process by a breaker device. It is a concept.
  • the irradiation optical system includes a first cylindrical lens that is provided on the laser beam path and focuses the laser beam in a first direction perpendicular to the laser beam path direction, and the laser beam is in the path direction and the first direction. And a second cylindrical lens that diverges in a second direction perpendicular to.
  • a laser irradiation region can be formed in an irradiation region of a desired size.
  • At least one of the pair of axicon lenses may be movable in the laser beam path direction.
  • the peak interval of the laser beam can be adjusted independently of the size of the laser irradiation region formed on the glass substrate.
  • the pair of axicon lenses may be movable in at least one direction parallel to the cross section of the laser beam. In this case, the position of the peak of the laser beam can be adjusted independently of the size of the laser irradiation region formed on the glass substrate.
  • the irradiation optical system may be provided closer to the brittle material substrate than the pair of axicon lenses.
  • the first cylindrical lens and the second cylindrical lens may be independently movable in the laser beam path direction.
  • the pair of axicon lenses and the irradiation optical system may be arranged on a straight line so that their optical axes are substantially perpendicular to the brittle material substrate.
  • the pair of axicon lenses and the irradiation optical system may be mounted on a rotary head that can rotate around an axis perpendicular to the brittle material substrate. In this case, since the cutting direction can be changed by rotating the rotary head without rotating the brittle material substrate, productivity can be improved.
  • An optical axis adjustment unit for adjusting the incident direction of the laser beam with respect to the pair of axicon lenses and the irradiation optical system may be further provided.
  • Another aspect of the present invention also relates to a processing apparatus for cutting a brittle material substrate that is a processing target along a planned processing line.
  • This processing device patterns the laser beam into an annular shape, and condenses or diverges the laser beam, patterns it into a long and narrow shape whose processing target line is the longitudinal direction, and irradiates the patterned laser beam onto the processing target line of the brittle material substrate.
  • a laser irradiation device that cools the brittle material substrate along the planned processing line, a cooling device that cools a predetermined cooling region on the processing planned line that is in the vicinity of the laser irradiation region, and jets a cooling medium. And a stage that is moved relative to the cooling region.
  • both the intensity distribution in the direction of the processing line of the laser beam and the intensity distribution in the vertical direction are fully cut. It can be set as the shape suitable for.
  • Another aspect of the present invention also relates to a processing apparatus for cutting a brittle material substrate that is a processing target along a planned processing line.
  • This processing apparatus includes a laser irradiation apparatus for patterning a laser beam into a long and narrow shape with a planned processing line in the longitudinal direction, and irradiating the patterned laser beam on the processing target line of the brittle material substrate, and in the vicinity of the laser irradiation region.
  • a cooling device that cools a predetermined cooling area on the planned processing line by jetting a cooling medium, and a stage that moves the brittle material substrate relative to the laser irradiation area and the cooling area along the planned processing line.
  • the intensity distribution of the laser beam in the laser irradiation region has two peaks in the longitudinal direction and two peaks in the direction perpendicular to the longitudinal direction.
  • the brittle material substrate can be heated to a state suitable for full cut.
  • the laser beam may be generated by patterning a single laser beam.
  • the intensity distribution varies, and this problem can be solved by patterning a single laser beam.
  • the laser irradiation apparatus may include a pair of axicon lenses provided on the laser beam path and arranged such that their vertices face each other or face each other, and an irradiation optical system that focuses the laser beam. Good.
  • Still another aspect of the present invention relates to a method of cutting a brittle material substrate that is an object to be processed along a planned processing line.
  • a laser beam is patterned into a long and narrow shape in which the processing line is in the longitudinal direction, and the patterned laser beam is irradiated onto the processing line of the brittle material substrate, and in the vicinity of the laser irradiation region and on the processing line.
  • the step of cooling the predetermined cooling region by injecting the cooling medium is performed while moving the brittle material substrate in the direction of the planned processing line.
  • the laser beam is patterned by a pair of axicon lenses provided on the path of the laser beam and arranged such that their vertices face each other or face each other and an irradiation optical system that collects the laser beam. .
  • Still another aspect of the present invention also relates to a method of cutting a brittle material substrate that is an object to be processed along a planned processing line.
  • the laser beam is patterned into an annular shape, condensed or diverged, and patterned into a long and narrow shape whose processing target line is in the longitudinal direction, and the patterned laser beam is irradiated onto the processing target line of the brittle material substrate.
  • Performing a step of cooling a predetermined cooling region in the vicinity of the laser irradiation region on the planned processing line by injecting a cooling medium while moving the brittle material substrate relative to the laser irradiation region and the cooling region.
  • Still another embodiment of the present invention also relates to a method of cutting a brittle material substrate that is an object to be processed along a planned processing line.
  • a laser beam is patterned into a long and narrow shape in which the processing line is in the longitudinal direction, and the patterned laser beam is irradiated onto the processing line of the brittle material substrate, and in the vicinity of the laser irradiation region and on the processing line.
  • the step of cooling the predetermined cooling region by injecting the cooling medium is performed while moving the brittle material substrate in the direction of the planned processing line.
  • the intensity distribution of the laser beam has two peaks in the longitudinal direction and two peaks in a direction perpendicular to the longitudinal direction.
  • Still another embodiment of the present invention relates to an irradiation apparatus mounted on a processing apparatus that heats a brittle material substrate, which is a processing target, with a laser beam, and then cools and cuts the target by jetting a cooling medium.
  • a laser beam is patterned into a long and narrow shape whose processing line is in the longitudinal direction, and is irradiated onto the processing line of the brittle material substrate.
  • the irradiation device is a pair of axes arranged on a straight line on the laser beam path such that the optical axis is substantially perpendicular to the brittle material substrate, with the vertices facing each other.
  • a con lens and an irradiation optical system for condensing the laser beam are provided.
  • Still another aspect of the present invention relates to a flat panel manufacturing method.
  • This method includes the steps of manufacturing a mother glass on which a pixel circuit is formed, and cutting the mother glass by any of the above-described methods.
  • a plurality of flat panels can be cut out from the mother glass with high yield and high quality.
  • the flat panel includes a liquid crystal display panel, a plasma display panel, an organic EL display panel, and the like.
  • Still another aspect of the present invention relates to a flat panel.
  • This flat panel is manufactured by a step of manufacturing a mother glass on which a pixel circuit is formed, and a step of cutting the mother glass by any one of the above-described methods.
  • Still another embodiment of the present invention relates to a display device.
  • the display device includes the flat panel described above and a drive circuit that drives the flat panel.
  • An aspect of the present invention relates to a processing apparatus that cuts a brittle material substrate that is a processing target along a planned processing line.
  • This processing apparatus includes a laser irradiation apparatus for patterning a laser beam into a long and narrow shape with a planned processing line in the longitudinal direction, and irradiating the patterned laser beam on the processing target line of the brittle material substrate, and in the vicinity of the laser irradiation region.
  • a cooling device for injecting a cooling medium to cool a predetermined cooling region on the processing line, and a stage for moving the brittle material substrate relative to the laser irradiation region and the cooling region in the direction of the processing line. .
  • the width in the direction perpendicular to the planned processing line in the cooling region is shorter than the width in the direction perpendicular to the planned processing line in the laser irradiation region.
  • the “width in the direction perpendicular to the processing line of the cooling region” refers to the width of the region in which the cooling medium is injected (hereinafter also simply referred to as “the width of the cooling region”).
  • the “width in the direction perpendicular to the processing line of the laser irradiation region (hereinafter also simply referred to as“ width of the laser irradiation region ”)” refers to the full width at half maximum of the intensity.
  • the cooling medium is a droplet ejected from the nozzle, and the diameter of the droplet may be 80 ⁇ m or less.
  • the width of the cooling region narrower than the laser irradiation region and making the droplet diameter smaller than the case where it is generated by two liquid nozzles (at least 100 ⁇ m), preferably 80 ⁇ m or less, it is more suitable for full cut. Cooling can be realized.
  • the cooling medium is a droplet ejected from the nozzle, and the diameter of the droplet may be 30 ⁇ m or less.
  • the smaller the diameter of the droplet the better the quality of the cut surface, such as processing accuracy and linearity.
  • the substrate thickness of the workpiece is a wide range from several mm to 0.1 mm. The quality can be improved.
  • the cooling medium may be water droplets. Cost can be reduced by using water.
  • the cooling device may include a nozzle having a coaxial double pipe structure, and may inject liquid from a central passage of the double pipe and gas from an outer passage surrounding the central passage.
  • the liquid from the central passage can be ejected as droplets having a diameter smaller than 100 ⁇ m by the pressure of the gas ejected from the outer passage.
  • the gas ejected from the outer passage acts as a droplet guide, the region where the droplet is ejected can be limited to a desired cooling region.
  • the diameter of the central passage may be 2 mm or less.
  • the diameter of the central passage may be not less than 0.4 mm and not more than 0.9 mm.
  • the processing quality can be improved.
  • the width of the cooling region becomes smaller as the diameter becomes smaller, the adjustment range of the width of the laser irradiation region can be expanded.
  • Another aspect of the present invention also relates to a processing apparatus for cutting a brittle material substrate that is a processing target along a planned processing line.
  • This apparatus is designed to pattern a laser beam into an elongated shape whose processing line is in the longitudinal direction, and to irradiate the patterned laser beam on the processing line of the brittle material substrate, and in the vicinity of the laser irradiation region and processing
  • a cooling device that cools a predetermined cooling region on the planned line by jetting a cooling medium, and a stage that moves the brittle material substrate relative to the laser irradiation region and the cooling region in the direction of the processing planned line.
  • the cooling medium is a droplet ejected from the nozzle, and the diameter of the droplet is 80 ⁇ m or less.
  • rapid cooling more suitable for full cut can be realized by setting the diameter of the droplet to be smaller than the case where it is generated by two liquid nozzles (about 100 ⁇ m at the minimum), preferably 80 ⁇ m or less.
  • the diameter of the droplet may be 30 ⁇ m or less.
  • the cooling medium may be water droplets.
  • the cooling device may include a nozzle having a coaxial double pipe structure, and may inject liquid from a central passage of the double pipe and gas from an outer passage surrounding the central passage.
  • the diameter of the central passage may be 2 mm or less. More preferably, the diameter of the central passage may be not less than 0.4 mm and not more than 0.9 mm.
  • Still another embodiment of the present invention also relates to a processing apparatus for cutting a brittle material substrate, which is a processing target, along a planned processing line.
  • This apparatus is designed to pattern a laser beam into an elongated shape whose processing line is in the longitudinal direction, and to irradiate the patterned laser beam on the processing line of the brittle material substrate, and in the vicinity of the laser irradiation region and processing
  • a cooling device that cools a predetermined cooling region on the planned line by jetting a cooling medium, and a stage that moves the brittle material substrate relative to the laser irradiation region and the cooling region in the direction of the processing planned line.
  • the cooling device includes a nozzle having a coaxial double tube structure, and injects liquid from a central passage of the double tube and gas from an outer passage surrounding the central passage.
  • the liquid from the central passage can be ejected as droplets having a diameter smaller than 100 ⁇ m by the pressure of the gas ejected from the outer passage. Further, since the gas ejected from the outer passage acts as a droplet guide, the region where the droplet is ejected can be limited to a desired cooling region.
  • the diameter of the droplet ejected from the nozzle may be 30 ⁇ m or less.
  • the diameter of the central passage may be 2 mm or less. More preferably, the diameter of the central passage may be not less than 0.4 mm and not more than 0.9 mm.
  • the liquid may be water.
  • the width in the direction perpendicular to the planned processing line of the cooling region formed by the cooling medium ejected from the nozzle may be shorter than the width in the direction perpendicular to the planned processing line of the laser irradiation region.
  • Still another aspect of the present invention relates to a method of cutting a brittle material substrate that is an object to be processed along a planned processing line.
  • a laser beam is patterned into a long and narrow shape in which the processing line is in the longitudinal direction, and the patterned laser beam is irradiated onto the processing line of the brittle material substrate, and in the vicinity of the laser irradiation region and on the processing line.
  • the step of cooling the predetermined cooling region by injecting the cooling medium is performed while moving the brittle material substrate in the direction of the planned processing line.
  • the width in the direction perpendicular to the planned processing line in the cooling region is shorter than the width in the direction perpendicular to the planned processing line in the laser irradiation region.
  • Still another embodiment of the present invention also relates to a method of cutting a brittle material substrate that is an object to be processed along a planned processing line.
  • a laser beam is patterned into a long and narrow shape in which the processing line is in the longitudinal direction, and the patterned laser beam is irradiated onto the processing line of the brittle material substrate, and in the vicinity of the laser irradiation region and on the processing line.
  • the step of cooling the predetermined cooling region by ejecting droplets having a diameter of 80 ⁇ m or less is performed while moving the brittle material substrate in the direction of the planned processing line.
  • Still another embodiment of the present invention also relates to a method of cutting a brittle material substrate that is an object to be processed along a planned processing line.
  • This method uses a step of patterning a laser beam into a long and narrow shape with a processing line in the longitudinal direction, irradiating the patterned laser beam on the processing line of the brittle material substrate, and a nozzle having a coaxial double tube structure. Then, a cooling medium is generated by injecting liquid from the central passage of the double pipe and gas from the outer passage surrounding the central passage, and a predetermined cooling area on the processing planned line in the vicinity of the laser irradiation area. The step of jetting and cooling is performed while moving the brittle material substrate in the direction of the planned processing line.
  • Still another aspect of the present invention relates to a flat panel manufacturing method.
  • This method includes the steps of manufacturing a mother glass on which a pixel circuit is formed, and cutting the mother glass by any of the above-described methods.
  • a plurality of flat panels can be cut out from the mother glass with high yield and high quality.
  • the flat panel includes a liquid crystal display panel, a plasma display panel, an organic EL display panel, and the like.
  • Still another aspect of the present invention relates to a flat panel.
  • This flat panel is manufactured by a step of manufacturing a mother glass on which a pixel circuit is formed, and a step of cutting the mother glass by any one of the above-described methods.
  • Still another embodiment of the present invention relates to a display device.
  • the display device includes the flat panel described above and a drive circuit that drives the flat panel.
  • An aspect of the present invention relates to a processing apparatus that cuts a brittle material substrate that is a processing target along a planned processing line.
  • This processing apparatus cools a laser irradiation apparatus that patterns a laser beam and irradiates the patterned laser beam on a planned processing line of a brittle material substrate, and a predetermined cooling region on the processing planned line that is near the laser irradiation area.
  • a cooling device that jets and cools the medium, a stage that moves the brittle material substrate relative to the laser irradiation region and the cooling region in the direction of the planned processing line, and a predetermined region between the laser irradiation region and the cooling region.
  • a controller that monitors the temperature and adjusts the energy of the laser beam by feedback so that the temperature of the predetermined region matches the target value.
  • the temperature heated by the total energy of the laser beam that is, the temperature having a strong correlation with the peak temperature can be measured.
  • the peak temperature of the workpiece can be stabilized at the target value, and a high-quality full cut can be realized with a high yield.
  • the predetermined area may be set at a position closer to the laser irradiation area than the cooling area. By keeping the predetermined region away from the cooling region, the temperature at a location where the influence of cooling is small can be measured, and the temperature having a strong correlation with the peak temperature can be measured.
  • the predetermined area may be set within 1 cm from the tail end of the laser irradiation area.
  • the brittle material substrate may be divided from the start to the end into a plurality of segments and set a target temperature value for each segment.
  • the brittle material substrate can be heated to an optimum temperature according to the processing position.
  • the adjustment of the energy of the laser beam by feedback may be stopped in at least one of a predetermined range from the start end and a predetermined range from the end end.
  • Another aspect of the present invention relates to a processing method for cutting a brittle material substrate as a processing target along a planned processing line.
  • a laser beam is patterned, and the patterned laser beam is irradiated onto a planned processing line of a brittle material substrate, and a cooling medium is jetted onto a predetermined cooling region in the vicinity of the laser irradiation region on the planned processing line. Cooling, a step of monitoring the temperature of the predetermined region between the laser irradiation region and the cooling region, and a step of adjusting the energy of the laser beam by feedback so that the temperature of the predetermined region matches the target value Are performed while moving the brittle material substrate in the direction of the planned processing line.
  • Still another aspect of the present invention relates to a flat panel manufacturing method.
  • This method includes the steps of manufacturing a mother glass on which a pixel circuit is formed, and cutting the mother glass by any of the above-described methods.
  • a plurality of flat panels can be cut out from the mother glass with high yield and high quality.
  • the flat panel includes a liquid crystal display panel, a plasma display panel, an organic EL display panel, and the like.
  • Still another aspect of the present invention relates to a flat panel.
  • This flat panel is manufactured by a step of manufacturing a mother glass on which a pixel circuit is formed, and a step of cutting the mother glass by any one of the above-described methods.
  • Still another embodiment of the present invention relates to a display device.
  • the display device includes the flat panel described above and a drive circuit that drives the flat panel.
  • FIG. 1 is a block diagram showing an overall configuration of a processing apparatus 100 according to an embodiment.
  • the processing apparatus 100 cuts (full cuts) the brittle material substrate, which is the processing object 110, from the start end 112 toward the end 114 along the planned processing line, or forms a scribe line on the surface thereof.
  • Specific examples of the processing object 110 include various glass substrates used for FPD.
  • the glass substrate may be a single plate or a laminated substrate.
  • the left direction in FIG. 1 is the X direction
  • the front direction perpendicular to the paper surface is the Y direction
  • the upward direction is the Z axis.
  • the dimensions of each member and the like shown in some drawings are appropriately expanded or reduced for easy understanding within a scope not related to the essence of the invention, and the positional relationship between each member is easy to understand. For the sake of illustration, it is modified or changed as appropriate.
  • the processing apparatus 100 includes a stage 2, a table 4, an initial crack generation unit 6, a laser light source 8, a laser irradiation device 10, a cooling device 20, a temperature sensor 30, and a control unit 32.
  • the workpiece 110 is fixed on the table 4.
  • the fixing means negative pressure adsorption may be used, or physical fixing means using an adhesive tape, a clamper or the like may be used.
  • the position of the workpiece 110 may be fixed to the table 4 by its own weight.
  • the workpiece 110 is disposed in parallel with the XY plane.
  • Stage 2 moves table 4 on which workpiece 110 is fixed.
  • the processing object 110 moves relative to a laser irradiation region and a cooling region described later.
  • FIG. 1 assumes the case where the planned machining line is formed in the X-axis direction.
  • the stage 2 is configured to be able to adjust the angle ⁇ around the Z axis, and thereby the direction of the planned machining line with respect to the workpiece 110 can be adjusted.
  • the laser light source 8 is appropriately selected according to the wavelength dependency of the absorption rate of the workpiece 110.
  • a carbon dioxide gas laser (CO 2 laser) having a wavelength of 10.6 ⁇ m is preferable.
  • CO 2 laser carbon dioxide gas laser
  • laser scribing devices and cutting devices that use lasers with wavelengths in the visible light, ultraviolet region, or near infrared region, but the glass to be processed is transparent to these wavelengths. .
  • the processing technique according to the present embodiment using a CO 2 laser is completely different from the processing technique using a wavelength shorter than the near infrared in the heating or the subsequent cooling process. It should be noted that the obtained knowledge is not always useful for the processing technique according to the present embodiment.
  • the laser light source 8 emits a laser beam LB1 having a circular beam profile.
  • the cross-sectional intensity profile of a laser beam has a Gaussian distribution, but it may be a beam whose outer periphery is cut off by an aperture or the like, or may be a beam having another intensity distribution.
  • the beam profile is usually a perfect circle, but the shape can be corrected by the irradiation optical system at the subsequent stage, so it may be an ellipse, a square, or a rectangle. Rather, it may be better to positively correct the shape of the laser beam emitted from the laser light source in order to achieve the optimum heating for full cut.
  • the laser irradiation apparatus 10 patterns the laser beam LB1 emitted from the laser light source 8, and irradiates the patterned beam LB2 onto the planned processing line of the brittle material substrate that is the processing target 110.
  • the laser beam LB2 irradiated to the workpiece 110 has a long and narrow shape with a planned processing line in the longitudinal direction.
  • the size of the region (laser irradiation region) irradiated with the laser beam LB2 on the workpiece 110 is optimized according to the material and thickness of the workpiece 110. Furthermore, the size and shape may be changed in accordance with the position where the laser beam is irradiated.
  • the cooling device 20 injects the cooling medium CM to a predetermined cooling region on the planned processing line in the vicinity of the region (laser irradiation region) irradiated with the laser on the workpiece 110.
  • the cooling device 20 is configured by a nozzle that injects a mixture of gas and liquid, for example.
  • the nozzle is configured to be movable with respect to the X-axis direction, and the distance between the cooling region and the tail side end of the laser irradiation region 40 depends on the material and thickness of the workpiece 110, the size of the laser irradiation region, and the like. Optimized.
  • the initial crack generating unit 6 is provided to form an initial crack at the starting end 112 of the workpiece 110 on the planned processing line.
  • the initial crack generation unit 6 is composed of a cutter such as diamond.
  • the laser irradiation region and the cooling region are scanned along the planned processing line with the initial crack as a starting point, and a full cut split section grows using the initial crack as a seed.
  • a full cut may be possible without forming an initial crack.
  • FIG. 2 is a plan view of the laser irradiation region 40 and the cooling region 44 formed on the processing target object 110 as viewed from above the processing target object 110.
  • the laser irradiation area 40 and the cooling area 44 are arranged along a planned processing line 42 indicated by a one-dot chain line.
  • the heating and cooling conditions in the laser irradiation region 40 and the cooling region 44 are extremely important.
  • FPD glass panels are required to have high quality with a flat section of about ⁇ 2 ⁇ m and a linearity of about ⁇ 25 ⁇ m.
  • the processing apparatus 100 according to the embodiment has several features for optimizing heating conditions and cooling conditions necessary for fully cutting a glass substrate with high quality.
  • One feature of the processing apparatus 100 according to the embodiment is temperature control of the processing object 110. First, this temperature control will be described.
  • the temperature sensor 30 is preferably a non-contact type, and for example, an infrared sensor can be used.
  • the temperature sensor 30 outputs a signal (hereinafter referred to as a temperature signal) Stmp corresponding to the measured temperature to the control unit 32.
  • the control unit 32 feedbacks the laser beam LB1 output from the laser light source 8 so that the value of the temperature signal Stmp matches a predetermined reference value by feedback, that is, the measured temperature of the predetermined region 46 matches the target value. Adjust the energy.
  • the target temperature value is set to be equal to or lower than the softening point corresponding to the material of the workpiece 110.
  • Conventional processing apparatuses generally use the output stabilization mechanism of the laser light source 8. That is, the energy of the laser beam LB1 is kept constant by the laser light source 8 regardless of the state of the workpiece 110. However, even if the energy of the laser beam LB1 is kept constant, if the coefficient of thermal diffusion changes according to the processing position of the processing object 110 or the cooling condition by the cooling device 20 is changed, the temperature of the laser irradiation region 40 will be increased. It will change.
  • the applicant of the present invention has not so wide a peak temperature range that can realize a high-quality, high-yield full cut, and even if the energy of the laser beam LB1 is kept constant, It has been recognized that the peak temperature deviates from a predetermined range, leading to a decrease in quality or a situation where full cutting cannot be performed.
  • the processing apparatus 100 is provided with a mechanism for controlling the laser light source 8 so that the temperature of the predetermined region 46 is constant, and the processing object 110 is reliably brought to a predetermined peak temperature. In addition to being able to be heated, temperature fluctuations can be suppressed, so that the quality can be improved.
  • the predetermined region 46 is preferably set at a position on the planned processing line 42 and closer to the laser irradiation region 40 than the cooling region 44. More specifically, the predetermined region 46 is preferably located as close to the laser irradiation region 40 as possible, but when the laser irradiation region 40 overlaps, the reflected light of the laser beam is incident on the temperature sensor 30, so normal temperature measurement is performed. May interfere.
  • the predetermined area 46 is set to a position within 1 cm, preferably 2 to 3 mm from the tail end 41 of the laser irradiation area 40 in a range that does not overlap the laser irradiation area 40. If the predetermined region 46 is set at this position, the temperature at a place where the influence of cooling immediately after heating is small can be measured. The temperature thus measured is close to the peak temperature of the substrate. From another point of view, what is important in fully cutting the workpiece 110 is to reliably heat the workpiece 110 to a predetermined peak temperature, and to further suppress variations in the peak temperature. It can be said. Therefore, measuring the temperature immediately adjacent to the laser irradiation region 40 is significant because a temperature having a strong correlation with the peak temperature can be measured as compared with the case where the temperature near the cooling region 44 is measured.
  • the optimum peak temperature of the workpiece 110 varies depending on the distance from both end portions 112 and 114. Therefore, the processing apparatus 100 according to the embodiment has a function of changing a target temperature value in accordance with the heating position.
  • FIG. 3 is a plan view of the workpiece 110 to be segmented as viewed from above.
  • a portion between the start end 112 and the end end 114 of the workpiece 110 is virtually divided into a plurality of segments SEG1 to SEG5.
  • the number of segments and the length of the segments are arbitrary and are design matters.
  • the control unit 32 is configured such that a target temperature value can be set independently for each segment. As a result, the workpiece 110 can be heated to an optimum temperature according to the distance from both end portions 112 and 114.
  • the temperature control by feedback of the control unit 32 can be switched between valid and invalid independently for each segment.
  • the adjustment of the energy of the laser beam by feedback may be stopped in at least one of the predetermined range from the start end 112 and the predetermined range from the end end 114, that is, at least one of the first segment SEG1 and the fifth segment SEG5. From this viewpoint, it is desirable to divide the segment into three or more segments including a segment including the start end, a segment including the end end, and a segment including none.
  • the segment SEG1 including the start end 112 and the segment SEG5 including the end 114 are different from the intermediate segments SEG2 to SEG4 in terms of the boundary condition of thermal diffusion. Therefore, if feedback is performed so as to keep the monitored temperature constant, the actual breaking line may deviate from the planned machining line 42 or the cross-sectional accuracy may be deteriorated. However, if the feedback is invalidated, these problems can be solved. .
  • the control unit 32 controls the scanning speed (also referred to as processing speed) of the stage 2.
  • the control unit 32 switches between three modes: a constant speed mode for moving the workpiece 110 at a constant speed, an acceleration mode for increasing the moving speed of the workpiece 110 with time, and a deceleration mode for decreasing the moving speed with time.
  • An arbitrary mode can be assigned to each segment SEG described above. For example, the first segment SEG1 including the start end 112 is processed in the acceleration mode, the fifth segment SEG5 including the end end 114 is processed in the deceleration mode, and the intermediate segments SEG2 to SEG4 are processed in the constant speed mode.
  • a first mode in which shifting is performed at a constant acceleration from the initial speed to the final speed and a second mode in which the speed is changed according to a trigonometric function (sine curve) can be switched.
  • control unit 32 can set the scan speed (initial speed, final speed) for each segment.
  • the scan speed can be set in the range of 0 to 500 mm / s, and is typically selected between 5 and 150 mm / s.
  • a high quality full cut can be realized by optimizing the two parameters of the target temperature of the workpiece 110 and the machining speed in accordance with the machining position.
  • the temperature of the processing object 110 changes.
  • the temperature of the predetermined region 46 in the vicinity of the laser irradiation region 40 constant by feedback, the temperature of the workpiece 110 is maintained at the target value even if the processing speed is changed. That is, it can be said that one of the advantages of the processing apparatus 100 according to the embodiment is that the processing speed and the heating temperature can be set independently.
  • the above is the characteristic configuration and control of the processing apparatus 100 as a whole.
  • heating technology and cooling technology for realizing a higher quality full cut by combining with the above control mechanism will be described in order.
  • the following heating and cooling techniques may be used independently regardless of the control method described above.
  • FIG. 4 is a diagram showing a laser irradiation region formed on the workpiece 110.
  • FIG. 4 shows the shape of the laser irradiation region 40 when viewed from the upper surface of the workpiece 110 and the intensity distributions in the X and Y directions of the laser beam LB2.
  • the intensity distribution of the laser beam in the laser irradiation region in the beam longitudinal direction has two peaks. That is, on the object to be processed 110, two spots with high injected heat density are formed in the direction of the planned processing line 42. Also, the intensity distribution in the direction perpendicular to the long direction (short direction) is not a Gaussian distribution but has a flat shape.
  • the beam pattern in FIG. 4 is not formed by superimposing a plurality of beams having different peak positions, but is also formed by patterning the laser beam LB emitted from the single laser light source 8. This is one of the features of the form.
  • FIG. 5 is a block diagram illustrating a configuration of the laser irradiation apparatus 10 according to the embodiment.
  • FIG. 6 is a diagram schematically showing the shape of the laser beam LB in each part of the laser irradiation apparatus 10 of FIG.
  • FIG. 5 shows a laser light source 8 and the like in addition to the laser irradiation device 10.
  • the laser light source 8 can be positioned and adjusted in the Z-axis direction.
  • the laser irradiation apparatus 10 includes a pair of axicon lenses (axicon lens pair 11) including a first axicon lens (conical lens) 12 and a second axicon lens 14, an irradiation optical system 16, and first mirrors M1 to M3.
  • axicon lens pair 11 a pair of axicon lenses (axicon lens pair 11) including a first axicon lens (conical lens) 12 and a second axicon lens 14, an irradiation optical system 16, and first mirrors M1 to M3.
  • a mirror M3 is provided.
  • the axicon lens pair 11 and the irradiation optical system 16 are provided on the path of the laser beam LB1.
  • the first axicon lens 12 and the second axicon lens 14 are arranged so that their vertices face each other.
  • At least one of the first axicon lens 12 and the second axicon lens 14 is mounted on a movable mounter, and is configured to be movable in the laser beam path direction (Z-axis direction). That is, the distance ⁇ z between the apexes of the first axicon lens 12 and the second axicon lens 14 can be adjusted.
  • the laser beam LB3 that has passed through the axicon lens pair 11 has an annular (doughnut-shaped) intensity distribution.
  • the diameter of the ring can be adjusted in accordance with the distance ⁇ z between the apexes of the axicon lens pair 11, and as a result, the peak interval of the intensity distribution in the direction of the processing line of the laser beam LB2 that is finally generated is It can be adjusted independently of the size of the laser irradiation area.
  • the axicon lens pair 11 can be arranged such that the positions of the first axicon lens 12 and the second axicon lens 14 in the vertical direction (Z direction) are interchanged so that the vertices are not opposed to each other, that is, oppositely opposed. It is.
  • the axicon lens pair 11 is preferably movable in at least one direction parallel to the cross section of the laser beam, that is, in either the X-axis direction or the Y-axis direction, or both.
  • the center of the ring of the laser beam LB3 in FIG. 6 can be offset.
  • the position of the peak intensity (see FIG. 4) of the laser irradiation region 40 to be finally generated can be arbitrarily adjusted, which is convenient when optimizing the heating state of the workpiece 110. It is.
  • the irradiation optical system 16 condenses or diverges the laser beam LB3 that has passed through the axicon lens pair 11 and projects the laser beam LB3 onto the laser irradiation region on the workpiece 110.
  • the enlargement / reduction rate of the light collection and divergence may be determined according to the diameter of the original laser beam LB1 and the size of the laser irradiation region 40.
  • the irradiation optical system 16 includes a first cylindrical lens CL1 and a second cylindrical lens CL2.
  • the first cylindrical lens CL1 and the second cylindrical lens CL2 are arranged such that the cross sections having curvatures are perpendicular to each other.
  • the first cylindrical lens CL1 is an optical element that condenses the laser beam in a first direction (Y-axis direction) perpendicular to the path direction (Z-axis opposite direction). Specifically, the first cylindrical lens CL1 is a plano-convex cylindrical lens, and reduces the laser beam LB2 irradiated to the workpiece 110 in the Y-axis direction. The curvature of the first cylindrical lens CL1 is determined according to the diameter of the original laser beam LB1 and the size of the laser irradiation region. As an alternative to the first cylindrical lens CL1, a concave cylindrical mirror may be used.
  • the laser beam LB4 that has passed through the first cylindrical lens CL1 has a shape obtained by reducing the laser beam LB3 in the Y-axis direction. As the laser beam LB4 approaches the workpiece 110, the width in the Y-axis direction decreases, and the final intensity distribution in the Y-axis direction matches that in FIG.
  • the second cylindrical lens CL2 is an optical element that diverges the laser beam in a second direction (X-axis direction) perpendicular to the path direction (Z-axis opposite direction) and the first direction (Y-axis direction).
  • the second cylindrical lens CL2 is a plano-concave cylindrical lens, and expands the laser beam LB2 irradiated to the workpiece 110 in the X-axis direction. Similar to the first cylindrical lens CL1, the curvature of the second cylindrical lens CL2 is also determined according to the diameter of the original laser beam LB1 and the size of the laser irradiation region.
  • a convex cylindrical mirror may be used as an alternative to the second cylindrical lens CL2, a convex cylindrical mirror may be used.
  • the laser beam LB5 that has passed through the second cylindrical lens CL2 has a shape obtained by enlarging the laser beam LB4 in the X-axis direction.
  • the width in the X-axis direction widens, and the final intensity distribution in the X-axis direction matches that in FIG.
  • the first cylindrical lens CL1 and the second cylindrical lens CL2 are arranged so that the processing object 110 side is a plane, but may be in opposite directions, and the positions of the first cylindrical lens CL1 and the second cylindrical lens CL2 are It may be replaced.
  • the first cylindrical lens CL1 and the second cylindrical lens CL2 are mounted on a movable mounter, and can be moved independently in the laser beam path direction. That is, the distance between the first cylindrical lens CL1 and the workpiece 110 and the distance between the second cylindrical lens CL2 and the workpiece 110 can be adjusted independently. As a result, the length L in the X-axis direction and the width W in the Y-axis direction of the laser irradiation region 40 shown in FIG. 4 can be adjusted independently.
  • the length L and the width W of the laser irradiation region 40 are defined by the full width at half maximum (Full Width at Half Maximum). Further, by adjusting the positions of the first cylindrical lens CL1 and the second cylindrical lens CL2 in the Z-axis direction, the position of the peak intensity in FIG. 4 can be changed.
  • the order of arrangement of the axicon lens pair 11 and the irradiation optical system 16 can be switched, but preferably, as shown in the figure, the axicon lens pair 11 is provided on the laser light source 8 side, and the irradiation optical system 16 is provided. In addition, it is preferable that the processing target object 110 side be disposed with respect to the axicon lens pair 11.
  • the area of the axicon lens pair 11 can be reduced.
  • the alignment becomes simple. If the focused beam is incident on the axicon lens pair 11, a slight deviation of the optical axis will appear as a deviation of the position of the intensity peak of the finally formed laser beam LB2.
  • the axicon lens pair 11 and the irradiation optical system 16 are arranged on the laser beam path, their optical axes do not necessarily coincide with each other.
  • the optical axis of the irradiation optical system 16 may coincide with the Z axis
  • the axicon lens pair 11 may be disposed at a position before being folded back by the third mirror M3, and the optical axes thereof may coincide with the X axis.
  • the axicon lens pair 11 and the irradiation optical system 16 are arranged on a straight line so that their optical axes are substantially perpendicular to the workpiece 110. It is desirable.
  • the axicon lens pair 11 and the irradiation optical system 16 can be attached to a rotary head 18 that can rotate around a rotary shaft 19 indicated by a one-dot chain line perpendicular to the workpiece 110.
  • the rotary head 18 is rotated 180 degrees with respect to the X-axis, and the scan direction of the workpiece 110 is reversed to turn back and cut the workpiece 110. Can do.
  • the planned machining line can be set in the Y-axis direction by rotating the rotary head 18 by 90 degrees or 270 degrees with respect to the X-axis and moving the stage 2 in the Y-axis direction. That is, machining in the X-axis direction and the Y-axis direction can be performed without rotating the workpiece 110.
  • the shutter 9 is provided to block the laser beam LB1 emitted from the laser light source 8 from being inadvertently irradiated to the workpiece 110.
  • the fourth mirror M4 functions as a substantial shutter and the fourth mirror M4 is arranged on the path of the laser beam LB1, the laser beam LB1 is reflected and incident on the beam damper BD, and the laser for the laser irradiation device 10 is reflected. The supply of the beam LB1 is stopped. When the fourth mirror M4 is removed from the path of the laser beam LB1, the laser beam LB1 is supplied to the laser irradiation device 10.
  • the laser diode 7 and the fifth mirror M5 are provided for alignment of optical elements in the laser irradiation apparatus 10. Since the laser beam LB1 is in the infrared region and is not visible to the human eye, a visible laser beam (illustrated by a broken line) is used as an alternative.
  • the fifth mirror M5 matches the optical axis of the beam from the laser diode 7 with the optical axis of the laser beam LB1 from the laser light source 8.
  • the first mirror M1, the second mirror M2, and the third mirror M3 constituting the optical axis adjustment unit 17 are provided to guide the laser beam LB1 to the axicon lens pair 11.
  • the first mirror M1 and the second mirror M2 are mounted on a movable mounter for adjusting the inclination with respect to the optical axis, and the incident angle of the laser beam with respect to the axicon lens pair 11 and the irradiation optical system 16 is adjusted.
  • the user of the laser irradiation apparatus 10 adjusts the optical axis adjustment unit 17 by relying on the visible laser beam emitted from the laser diode 7, and transmits the laser beam LB1 from the invisible laser light source 8 to the axicon lens pair. 11 and the irradiation optical system 16 can be appropriately incident.
  • the laser beam can be patterned in a state suitable for full cut, and the optical system can also be configured simply.
  • the shape and intensity distribution of the laser irradiation region 40 suitable for full cut are: (1) It has an elongated shape extended in the planned processing line direction and has two intensity peaks in the planned processing line direction. (2) having two intensity peaks in the direction perpendicular to the planned processing line; Satisfying at least one, preferably both.
  • the laser irradiation region 40 that satisfies both the above (1) and (2) can be suitably formed. Although it is difficult or substantially impossible to form the laser irradiation region 40 having this intensity distribution by superimposing a plurality of beams, a single laser can be obtained by using the laser irradiation apparatus 10 of FIG. It can be easily generated by beam patterning.
  • the length L, width W, peak distances ⁇ Lpk, ⁇ Wpk, and peak intensities ILpk, IWpk of the laser irradiation region 40 in FIG. 4 are extremely important parameters for full-cutting the workpiece 110.
  • each parameter can be adjusted individually.
  • FIG. 5 From another point of view, in order to realize a high-quality full cut, instead of or in addition to forming the laser irradiation region 40 satisfying the above (1) and (2), FIG. It can be said that it is important to use the laser irradiation apparatus 10 provided with the axicon lens pair 11 shown.
  • the laser irradiation region 40 formed on the workpiece 110 does not necessarily have both (1) and (2). May not meet.
  • a high-quality full cut can be realized by using the laser irradiation region 40 formed using the laser irradiation apparatus 10 having the above-described characteristics.
  • the processing apparatus 100 is also characterized by a cooling process by the cooling apparatus 20.
  • the details of the cooling process will be described below.
  • the cooling process described below realizes a high quality, high yield full cut in combination with the above-described characteristic laser irradiation apparatus 10, but the laser irradiation apparatus 10 has a different configuration. Even so, the same actions and effects can be achieved.
  • the width Wc of the cooling region 44 in the direction perpendicular to the processing line 42 (that is, the Y-axis direction) is shorter than the width W of the laser irradiation region 40 in the Y-axis direction.
  • the cooling medium CM is preferably a droplet ejected from a nozzle.
  • the diameter (particle diameter) of the droplet is desirably 80 ⁇ m or less, and more preferably 30 ⁇ m or less.
  • water droplets at room temperature can be used as the cooling medium. By using water, the workpiece 110 can be cooled at low cost.
  • the particle size of the droplet is about 100 ⁇ m at the minimum.
  • the diameter of the droplets 30 ⁇ m or less cooling more suitable for full cut can be realized.
  • FIG. 7 is a diagram illustrating a configuration of the nozzle 21 suitable for the cooling device 20.
  • the nozzle 21 has a coaxial double tube structure.
  • the inner wall of the inner tube 22 forms a central passage 26.
  • the outer tube 24 is provided coaxially with the inner tube 22, and an outer passage 28 is formed between the outer wall of the inner tube 22 and the inner wall of the outer tube 24.
  • a liquid such as water is supplied to the central passage 26 from the outside.
  • the outer passage 28 is supplied with a gas, for example air, maintained at a constant pressure via a regulator.
  • the pressure is adjusted according to the cooling conditions, centering on about 5-6 MPa.
  • liquid is ejected from the central passage 26 of the double tube and gas is ejected from the outer passage 28 by the nozzle 21 in FIG.
  • the liquid ejected from the central passage 26 is finely crushed by the pressure of the gas ejected from the outer passage 28 and ejected as droplets.
  • a droplet having a diameter smaller than 80 ⁇ m can be sprayed on the workpiece 110 by appropriately setting the gas pressure.
  • the region where the droplet is ejected can be limited to a desired cooling region.
  • the tip of the nozzle 21 is desirably arranged with a gap of 2 to 3 mm from the surface of the workpiece 110.
  • the nozzle 21 may be inclined from the direction perpendicular to the surface of the workpiece 110 (Z-axis direction) to the X-axis direction.
  • the width W of the laser irradiation region 40 is optimized within a certain range on the basis of, for example, the same degree as the thickness of the workpiece 110. Since the width Wc of the cooling region 44 is preferably narrower than that, it is desirable to use the nozzle 21 having a diameter as small as possible in order to fully cut a substrate having various thicknesses with the same nozzle.
  • a nozzle with a diameter ⁇ i of the central passage 26 of 2.84 mm is used, a full cut can be made, but there may be cases where the processing accuracy and quality are not satisfactory. If improved and a 0.58 mm nozzle is used, a very high quality full cut can be achieved.
  • the diameter ⁇ i of the central passage is in the range of 0.4 mm to 0.9 mm, and it is preferable to select one as thin as possible.
  • the processing apparatus 100 is characterized by the temperature control, the heating process, and the cooling process, and by combining these, high-precision and high-quality laser processing can be realized.
  • the characteristic technique according to the present invention is exhibited, and this aspect is also effective as the present invention.
  • Certain embodiments of the present invention can be used in processing technology for brittle material substrates.
  • DESCRIPTION OF SYMBOLS 100 ... Processing apparatus, 2 ... Stage, 4 ... Table, 6 ... Initial crack production
  • cooling region, 46 predetermined region, CL1 ... first cylindrical lens, CL2 ... first Two cylindrical lenses, M1 ... first mirror, M2 ... second mirror, M3 ... third mirror, 110 ... workpiece, 112 ... start end, 114 ... end, LB ... laser Over-time, CM ... cooling medium.

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Abstract

L'invention porte sur un appareil de traitement qui comprend un dispositif de rayonnement de laser (10) pour réaliser un motif d'un faisceau de laser en une forme allongée ayant une ligne de traitement prévue dans la direction longitudinale et irradier la ligne de traitement prévue sur un substrat en matériau fragile avec le faisceau de laser à motif. Une paire de lentilles tronconiques (12, 14) sont disposées sur le passage du faisceau de laser de telle sorte que les sommets des lentilles sont tournés l'un vers l'autre. Un système optique de rayonnement (16) concentre le faisceau de laser sur une pièce à travailler (110) ou amène le faisceau de laser à diverger de celle-ci.
PCT/JP2009/001606 2008-04-15 2009-04-07 Appareil de traitement de substrat en matériau fragile et procédé de découpe de substrat en matériau fragile WO2009128219A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2008-105651 2008-04-15
JP2008105646A JP5074272B2 (ja) 2008-04-15 2008-04-15 脆性材料基板の加工装置および切断方法
JP2008105649A JP2009255114A (ja) 2008-04-15 2008-04-15 脆性材料基板の加工装置および切断方法
JP2008105651A JP5220465B2 (ja) 2008-04-15 2008-04-15 脆性材料基板の加工装置および加工方法
JP2008-105649 2008-04-15
JP2008-105646 2008-04-15

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JP2020530400A (ja) * 2017-08-11 2020-10-22 コーニング インコーポレイテッド 透明な工作物を同期マルチレーザ加工するための装置および方法
JP2020531392A (ja) * 2017-08-25 2020-11-05 コーニング インコーポレイテッド アフォーカルビーム調整アセンブリを用いて透明被加工物をレーザ加工するための装置及び方法
CN112475638A (zh) * 2020-10-15 2021-03-12 西安中科微精光子制造科技有限公司 一种基于轴锥透镜的激光微孔加工系统和方法
US11633805B2 (en) 2018-09-28 2023-04-25 Corning Incorporated Rotating light source utilized to modify substrates

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JP6255595B2 (ja) 2012-10-12 2018-01-10 株式会社Ihi 割断装置
JP7123643B2 (ja) * 2018-06-11 2022-08-23 株式会社ディスコ レーザー加工装置

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