WO2014123080A1 - レーザ加工装置、レーザ加工方法 - Google Patents
レーザ加工装置、レーザ加工方法 Download PDFInfo
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- WO2014123080A1 WO2014123080A1 PCT/JP2014/052420 JP2014052420W WO2014123080A1 WO 2014123080 A1 WO2014123080 A1 WO 2014123080A1 JP 2014052420 W JP2014052420 W JP 2014052420W WO 2014123080 A1 WO2014123080 A1 WO 2014123080A1
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- WIPO (PCT)
- Prior art keywords
- substrate
- laser
- condensing position
- condensing
- laser processing
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Classifications
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B33/00—Severing cooled glass
- C03B33/10—Glass-cutting tools, e.g. scoring tools
- C03B33/102—Glass-cutting tools, e.g. scoring tools involving a focussed radiation beam, e.g. lasers
-
- 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
- B23K26/0734—Shaping the laser spot into an annular 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
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/0823—Devices involving rotation of the workpiece
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B33/00—Severing cooled glass
- C03B33/02—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor
- C03B33/0222—Scoring using a focussed radiation beam, e.g. laser
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B33/00—Severing cooled glass
- C03B33/02—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor
- C03B33/04—Cutting or splitting in curves, especially for making spectacle lenses
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C23/00—Other surface treatment of glass not in the form of fibres or filaments
- C03C23/0005—Other surface treatment of glass not in the form of fibres or filaments by irradiation
- C03C23/0025—Other surface treatment of glass not in the form of fibres or filaments by irradiation by a laser beam
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0009—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0933—Systems for active beam shaping by rapid movement of an element
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
Definitions
- the present invention relates to a laser processing apparatus and a laser processing method for performing through-hole processing on a substrate such as glass.
- a glass substrate having a thickness of 1 mm or less is used for a display screen of a portable information terminal typified by a smartphone, and the glass substrate is subjected to hole processing corresponding to functions such as various buttons and a microphone.
- hole drilling of a thin brittle material such as a glass substrate
- a decrease in yield due to the generation of cracks during processing becomes a problem.
- a relatively large hole having a diameter of about 10 mm such as the home button hole on the mobile information terminal screen described above, is drilled on the surface using a glass cutter with a diamond edge.
- a circular through hole is formed by attaching a processing flaw such as a lattice to the inside of a circular processing flaw, hitting it, and gradually expanding the opening. According to this, it is the present situation that artificial hitting greatly affects the accuracy of processing, and a decrease in yield due to the occurrence of cracks is inevitable to some extent.
- Patent Document 1 describes forming fine through holes in glass by laser processing using a YAG laser.
- Patent Document 2 describes forming a through-hole in a thin glass substrate by scanning a laser beam multiple times along the contour line on the inner side with respect to the contour line of the round hole. ing.
- the irradiation energy of the YAG laser is set to a predetermined threshold value or more.
- a fine through hole can be formed (see Patent Document 1).
- Patent Document 1 when a hole having a relatively large diameter of about 10 mm is drilled, it is necessary to scan the laser beam along the outline of the hole as described in Patent Document 2, and the galvanometer mirror. Therefore, there is a problem that the apparatus cost increases and the processing time becomes long.
- the present invention is an example of a problem to deal with such a problem. That is, when a relatively large hole is drilled in a brittle material substrate such as glass, the reduction in yield due to the occurrence of cracks can be eliminated, the device cost can be reduced, and the processing time can be shortened. It is an object of the present invention.
- a laser processing apparatus and a laser processing method according to the present invention have at least the following configurations.
- a laser processing apparatus for irradiating a laser beam on a substrate to perform through-hole processing on the substrate, and condensing the laser beam in a ring shape and irradiating the focused position within the thickness range of the substrate.
- a laser processing apparatus comprising: an optical lens; and a condensing position shift unit that shifts the condensing position in a thickness direction of the substrate and a planar direction of the substrate.
- the condensing position of the laser light condensed in a ring shape is shifted in a three-dimensional manner within the thickness range of the substrate, so that it follows the ring-shaped condensing position.
- Laser processing traces can be enlarged in the thickness direction and the radial direction simultaneously at the entire circumference. Accordingly, the through-hole processing of the substrate can be completed quickly with a simple apparatus configuration without using expensive laser scanning means.
- the laser processing trace formed in a ring shape will be gradually enlarged while shifting the position, the energy loss that the laser beam is scattered by being repeatedly irradiated with the laser beam is minimized. And efficient through-hole machining can be performed.
- FIG. 1 is an explanatory view showing an example of a condensing lens used in an embodiment of the present invention
- FIG. 1A is a diagram showing a cross-sectional shape of a condensing lens and a condensing state of laser light.
- FIG. 1B is a plan view of the beam shape of the laser beam condensed in a ring shape.
- the condensing lens 1 condenses the laser light L in a ring shape and irradiates the condensing position Fs within the thickness range of the substrate G.
- the condensing lens 1 is basically a circular cylindrical cylindrical lens. As shown in FIG. 1B, a circular cross-sectional laser beam L shaped to have a predetermined beam diameter is incident on the effective aperture. A ring-shaped condensing state La can be obtained.
- the laser processing apparatus and the laser processing method according to the embodiment of the present invention include converging position shift means configured in various forms to be described later.
- the condensing position shift means shifts the condensing position Fs where the laser light L is condensed in a ring shape by the condensing lens 1 in the thickness direction of the substrate G and the planar direction of the substrate G.
- the condensing position Fs of the laser light L is three-dimensionally changed within the thickness range of the substrate G.
- FIG. 2 is an explanatory diagram showing an operation of shifting the condensing position of the laser light in the embodiment of the present invention.
- FIG. 2A shows the movement in plan view
- FIG. 2B shows the movement in the thickness direction of the substrate.
- the condensing position Fs (Fs 1 , Fs 2 , Fs 3 , Fs 4 , Fs 5 , Fs 6 , Fs 7 , Fs 8 ) of the laser light L is at its center (O 1 , O 2 , O 3 , O 4 , O 5 , O 6 , O 7 , O 8 ) are shifted in a plane so as to make a circular motion.
- the movement locus at the center of the focal position Fs is a perfect circle in the illustrated example.
- the movement locus is not limited to this and may be an ellipse or a deformed circle locus.
- the circular movement here is a movement locus that is close to a circle. Anything is acceptable.
- the movement locus at the center of the condensing position Fs is a circle having a diameter W
- a laser processing mark is formed in the range of the width W around the entire circumference of the ring-shaped condensing position Fs. Due to the shift in the thickness direction of the condensing position Fs, laser processing traces having different depths in the thickness direction of the substrate G are formed as shown in FIG.
- the laser beam L is condensed in a ring shape, and the condensing position Fs is shifted in the thickness direction of the substrate G and the planar direction of the substrate G.
- the condensing position Fs is shifted so that the center of the ring-shaped condensing position Fs moves circularly.
- the condensing position Fs of the laser beam condensed in a ring shape is shifted three-dimensionally within the thickness range of the substrate G, so that it can be simultaneously performed on the entire circumference along the ring-shaped condensing position Fs.
- the laser processing trace can be progressively enlarged in the three-dimensional direction, and the through-hole processing of the substrate G can be completed quickly.
- the laser processing trace formed in the ring shape can be gradually enlarged while shifting the position, so that the laser beam is repeatedly irradiated with the process-affected layer to minimize the energy loss that is scattered by the laser beam.
- efficient through-hole machining can be performed.
- the diameter ⁇ of the through hole to be formed is about 2R + W (R is the radius of the ring-shaped condensing position Fs).
- FIG. 3 is an explanatory view showing an example of the laser processing apparatus according to the embodiment of the present invention.
- the laser processing apparatus 10 includes the above-described condensing lens 1 and condensing position shift means 2 that shifts the condensing position Fs of the condensing lens 1 in the thickness direction of the substrate G and the plane direction of the substrate G.
- the laser processing apparatus 10 also includes a laser light source 3 that emits laser light L, and an optical system (such as a beam expander 4 and a mirror 5) that guides the laser light L to the condenser lens 1.
- a substrate moving means 20 for moving the substrate G is provided.
- the substrate moving means 20 is a means for moving the substrate G up and down in the thickness direction (Z-axis direction), a means for swinging the substrate G about a horizontal axis (X-axis or Y-axis), and a vertical axis (Z-axis). ) Individual or combined means for rotating around. Further, the substrate moving means 20 may have means for rotating the substrate G about a rotation axis inclined with respect to an axis (Z axis) perpendicular to the surface thereof.
- a condensing lens moving means 21 for moving the condensing lens 1 is provided.
- the condenser lens moving means 21 is a means for swinging the condenser lens 1 around a horizontal axis (X axis or Y axis), and a means for rotating the condenser lens 1 around a rotation axis inclined with respect to the optical axis of the laser light L. Etc. individually or in combination.
- an optical element moving means 22 for moving an optical element (for example, the mirror 5 or the beam expander 4) of the optical system that guides the laser light L to the condensing lens 1 is provided.
- the optical element moving unit 22 is, for example, a unit that swings the angle of the mirror 5 that guides the laser light L to the condenser lens 1, and rotates the mirror 5 about a rotation axis that is inclined with respect to an axis perpendicular to the reflecting surface of the mirror 5.
- Means, means for swinging the beam expander 4 about the Y axis, etc. are provided individually or in combination.
- the laser processing apparatus 10 shown in FIG. 4 includes a laser light source 3, a beam expander 4 that expands the beam diameter of the laser light L emitted from the laser light source 3, a mirror 5, and a condensing beam.
- a lens 1 is provided, and the substrate G is irradiated with laser light L condensed in a ring shape by the condenser lens 1.
- an optical element moving means 22A for rotating the beam expander 4 around the rotation axis a is provided as the condensing position shifting means 2.
- the optical element moving means 22A is provided with a rotation axis a at a position deviated from the center 40 of the beam expander 4, and the rotation axis a and the optical axis of the laser beam L. Match.
- the beam expander 4 is rotated by the optical element moving means 22A, it is equivalent to irradiating the laser beam L at a position eccentric from the center 40 and causing the optical axis of the laser beam L to move circularly around the center 40. The effect is obtained.
- the angle of the laser light L emitted from the beam expander 4 and incident on the condensing lens 1 can be changed, and the condensing position Fs of the condensing lens 1 is changed in the thickness direction of the substrate G and the plane of the substrate G. Can be shifted in the direction.
- a substrate moving means 2 (20) for moving the substrate G in the thickness direction may be provided.
- a laser processing apparatus 10 shown in FIG. 5 includes a laser light source 3, a beam expander 4 that expands the beam diameter of the laser light L emitted from the laser light source 3, an image rotator (double prism) 6, a mirror 5, and a condenser lens 1.
- the substrate G is irradiated with laser light L condensed in a ring shape by the condenser lens 1.
- an optical element moving means 22B for rotating the image rotator (double prism) 6 around the rotation axis a1 is provided as the condensing position shift means 2.
- the optical element moving means 22B rotates the image rotator 6 that is inclined with respect to the optical axis of the laser light L around a rotation axis a1 parallel to the optical axis.
- the angle of the laser light L emitted from the image rotator 6 and incident on the condenser lens 1 can be changed, and the condensing position Fs of the condenser lens 1 is changed to the thickness direction of the substrate G and the plane direction of the substrate G. Can be shifted.
- a substrate moving means 2 (20) for moving the substrate G in the thickness direction may be provided.
- the generation of cracks during processing can be greatly suppressed as compared with the conventional technique using a glass cutter, and the operator's ability is Irrespective of this, high machining accuracy and yield can be realized.
- the substrate G, the condensing lens 1 or the condensing position shifting means 2 for moving the optical element is relatively used without using an expensive scanning means such as a galvanometer mirror. A simple and low-cost apparatus configuration can be realized.
- the laser-processed traces formed in a ring shape are gradually enlarged while shifting the position, so that it is possible to reduce the energy loss that the laser beam is scattered by repeatedly irradiating the process-affected layer with the laser beam, which is efficient.
- the processing time can be shortened by the through-hole processing.
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Abstract
Description
20:基板移動手段,21:集光レンズ移動手段,
22,22A,22B:光学要素移動手段,
3:レーザ光源,4:ビームエキスパンダ,5:ミラー,
6:イメージローテータ(ダブプリズム),
G:基板,L:レーザ光,Fs(Fs1~Fs8):集光位置
Claims (6)
- 基板上にレーザ光を照射して当該基板に貫穴加工を施すレーザ加工装置であって、
レーザ光をリング状に集光してその集光位置を前記基板の厚さ範囲内に照射する集光レンズと、
前記集光位置を前記基板の厚さ方向及び前記基板の平面方向にシフトする集光位置シフト手段を備えることを特徴とするレーザ加工装置。 - 前記集光位置シフト手段は、リング状の前記集光位置の中心が円運動をするように前記集光位置をシフトさせることを特徴とする請求項1記載のレーザ加工装置。
- 前記集光位置シフト手段は、前記基板を移動させる基板移動手段を備えることを特徴とする請求項1又は2に記載のレーザ加工装置。
- 前記集光位置シフト手段は、前記集光レンズを移動させる集光レンズ移動手段を備えることを特徴とする請求項1~3のいずれかに記載のレーザ加工装置。
- レーザ光を出射するレーザ光源と、
前記レーザ光源から出射されるレーザ光を前記集光レンズに導く光学系を備え、
前記集光位置シフト手段は、前記光学系における光学要素を移動させる光学要素移動手段を備えることを特徴とする請求項1~4のいずれかに記載のレーザ加工装置。 - 基板上にレーザ光を照射して当該基板に貫穴加工を施すレーザ加工方法であって、
レーザ光をリング状に集光してその集光位置を前記基板の厚さ範囲内に照射し、
前記集光位置を前記基板の厚さ方向及び前記基板の平面方向にシフトさせる過程で、
リング状の前記集光位置の中心が円運動するように前記集光位置をシフトさせることを特徴とするレーザ加工方法。
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KR1020157020986A KR20150114957A (ko) | 2013-02-05 | 2014-02-03 | 레이저 가공 장치 및 레이저 가공 방법 |
CN201480007118.5A CN104955605B (zh) | 2013-02-05 | 2014-02-03 | 激光加工装置、激光加工方法 |
US14/765,233 US20160002088A1 (en) | 2013-02-05 | 2014-02-03 | Laser processing apparatus and laser processing method |
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JP2013-020940 | 2013-02-05 | ||
JP2013020940A JP6161188B2 (ja) | 2013-02-05 | 2013-02-05 | レーザ加工装置、レーザ加工方法 |
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JP (1) | JP6161188B2 (ja) |
KR (1) | KR20150114957A (ja) |
CN (1) | CN104955605B (ja) |
TW (1) | TWI627009B (ja) |
WO (1) | WO2014123080A1 (ja) |
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2013
- 2013-02-05 JP JP2013020940A patent/JP6161188B2/ja active Active
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2014
- 2014-01-28 TW TW103103279A patent/TWI627009B/zh not_active IP Right Cessation
- 2014-02-03 CN CN201480007118.5A patent/CN104955605B/zh not_active Expired - Fee Related
- 2014-02-03 WO PCT/JP2014/052420 patent/WO2014123080A1/ja active Application Filing
- 2014-02-03 US US14/765,233 patent/US20160002088A1/en not_active Abandoned
- 2014-02-03 KR KR1020157020986A patent/KR20150114957A/ko not_active Application Discontinuation
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Also Published As
Publication number | Publication date |
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TWI627009B (zh) | 2018-06-21 |
US20160002088A1 (en) | 2016-01-07 |
JP2014151326A (ja) | 2014-08-25 |
CN104955605A (zh) | 2015-09-30 |
TW201440942A (zh) | 2014-11-01 |
JP6161188B2 (ja) | 2017-07-12 |
KR20150114957A (ko) | 2015-10-13 |
CN104955605B (zh) | 2019-07-19 |
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