WO2004016387A1 - レーザ加工方法 - Google Patents
レーザ加工方法 Download PDFInfo
- Publication number
- WO2004016387A1 WO2004016387A1 PCT/JP2003/009896 JP0309896W WO2004016387A1 WO 2004016387 A1 WO2004016387 A1 WO 2004016387A1 JP 0309896 W JP0309896 W JP 0309896W WO 2004016387 A1 WO2004016387 A1 WO 2004016387A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- workpiece
- laser
- hole
- processing method
- processing
- Prior art date
Links
Classifications
-
- 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
- B23K26/16—Removal of by-products, e.g. particles or vapours produced during treatment of a workpiece
-
- 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
- B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
- B23K26/0622—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses
- B23K26/0624—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses using ultrashort pulses, i.e. pulses of 1ns or less
-
- 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
- B23K26/36—Removing material
- B23K26/40—Removing material taking account of the properties of the material involved
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
- B23K2103/52—Ceramics
Definitions
- the present invention relates to a laser processing method, and more particularly to a laser processing method for processing a workpiece with an ultrashort pulse laser.
- the workpiece is processed by applying high energy to the workpiece by focusing and irradiating the laser with the laser beam.
- a workpiece that passes through a laser for example, a transparent workpiece such as quartz glass, or a workpiece that is not transparent with visible light transmitted through a laser of a specific wavelength
- the pulse Even if a long pulse laser or continuous wave laser was irradiated, the laser penetrated the workpiece and energy was not absorbed, making it difficult to process.
- an ultrashort pulse laser (femtosecond laser) with a pulse duration of 1 femtosecond or more and 1 picosecond or less
- the laser beam will be transmitted through the workpiece.
- a technology has been developed that can process the workpiece at the part where the laser is focused by the multiphoton absorption process.
- the laser beam is focused on the front surface of the workpiece (the surface facing the laser device). The laser is focused from the front side of the workpiece by a lens and irradiated from the front side of the workpiece for a certain period of time.
- the hole forming direction and the laser irradiation direction are the same direction.
- the plasma P generated by the laser L 2 The pressure direction due to 2 (arrow P 3) and the scattering direction of the processing removal material generated by laser irradiation (arrow M 2) conflict, and the scattering of the processing removal material is obstructed.
- the processing removal substance remains inside the hole H 2 and hinders subsequent processing by laser irradiation. For example, a hole is formed. In this case, hole H 2 having a high aspect ratio (ratio of hole depth to diameter) could not be formed.
- the hole formed becomes a hole with a larger diameter, that is, a taper shape as it approaches the laser irradiation direction. Holes that do not have a tapered shape can be formed by using a drill in most cases, but the drill is consumed due to wear on the workpiece and processing time is required. There is a problem. For example, when forming a hole with a diameter of ⁇ 5 0 0 Ai m to silicon dioxide (S i 0 2), the processing speed of its is zero. About 0 5 mm / s.
- An object of the present invention is to provide a laser processing method capable of accelerating removal of a processing removal substance generated during processing from a workpiece and improving processing performance. Disclosure of the invention
- the invention according to claim 1 is directed to irradiating the workpiece through which the ultrashort pulse laser is transmitted with the ultrashort pulse laser from one side of the workpiece, and the irradiated ultrashort pulse.
- Laser is one of the workpieces It is characterized in that it passes through one side, condenses on the other side, and processes the workpiece from the surface on the other side or near the surface.
- the workpiece is machined by the ultrashort pulse laser focused on the other side of the workpiece, the workpiece is started to be machined from the other side.
- the Rukoto When forming a dent in the workpiece, the focusing point of the ultra-short pulse laser focused on the other side is relatively to the workpiece so that it is directed toward the inside of the workpiece. Move to process.
- the material to be removed generated by this processing scatters in the direction that tends to diverge from the dent formed by the laser irradiation, that is, from the generation position to the outside of the workpiece.
- the plasma generated by the laser irradiation is always present in the processed part where the laser is irradiated, and as a result, it is located upstream in the direction of scattering of the processed removal material. . Therefore, the direction of the pressure generated by the generation of plasma and the direction of scattering of the processing removal material are almost the same, so the scattering of the processing removal material is promoted by the plasma, and the processing removal material inside the processed dent. Can be prevented. Therefore, machining performance can be improved.
- a workpiece to which laser is transmitted means, for example, a transparent workpiece such as stone and glass, or a workpiece that is not transparent in visible light that is transmitted by a laser having a specific wavelength. This means that the laser beam is completely transmitted, that is, not limited to absorption of the laser beam at all, but includes a substance having an absorption coefficient ⁇ ⁇ 1.
- the invention according to claim 2 is the laser processing method according to claim 1, wherein the ultrashort pulse laser focused on the other side is directed from the other side of the workpiece to the one side.
- a hole is formed in the workpiece by moving the workpiece relative to the workpiece. It is characterized by and.
- the focused ultrashort pulse laser is irradiated so that the ultrashort pulse laser focused on the other side is directed from the other side to the one side of the workpiece.
- a hole is formed in the workpiece by moving it relative to the workpiece. For this reason, even if the hole becomes deeper, the removal of the material to be removed is promoted. Therefore, the hole that is deeper than the case where machining is started from the front side of the workpiece as in the past, that is, the gap is reduced. Can be formed.
- a hole with a high aspect ratio can be formed in a short time compared to machining using a drill or the like.
- ultra-short pulse lasers can be processed with little thermal influence, there is little optical damage to the inner periphery of the hole in the workpiece, and holes that do not require post-processing such as mechanical polishing or heat treatment are required. It can be formed.
- the workpiece through which the ultrashort pulse laser is transmitted is aluminum oxide (A 1 2 0 3 ), silicon dioxide (Si0 2 ), diamond, silicon carbide (SiC), silicon (Si), and titanium dioxide (Ti0 2 ). It is said.
- aluminum oxide (A 1 2 0 3 ) of the present invention, silicon dioxide
- Si0 2 die algicidal down de, silicon carbide (SiC), shea Re co down (Si), and the material "composed mainly of diacid of titanium emissions (Ti0 2), oxide Aluminum two um
- materials containing other substances such as various types of dopants are included.
- aluminum oxide includes dopants. Includes titanium sapphire, ruby and sapphire.
- Silicon dioxide (S i 0 2 ) j includes quartz (crystal) and quartz glass.
- the ultrashort pulse laser focused on the other side is processed from the other side of the workpiece, for example, a recess is formed.
- the focused ultrashort pulse laser is moved relative to the workpiece to form holes in the workpiece, aluminum dioxide, which has been difficult to machine in the past, has been difficult.
- FIG. 1 is an explanatory diagram of a conceptual configuration of a laser processing apparatus that performs processing by the laser processing method of the present invention.
- FIG. 2 is an explanatory diagram showing a forming procedure when a hole is formed in a workpiece by the laser processing apparatus of FIG.
- FIG. 3 is an explanatory diagram showing the relationship between the material to be processed and the plasma when holes are formed by the laser processing apparatus of FIG.
- Fig. 4 is an explanatory diagram showing the holes formed in the workpiece in Experiment 1.
- Fig. 5 is an explanatory diagram showing the holes formed in the workpiece in Experiment 2.
- Fig. 6 is a conventional laser processing.
- FIG. 6 is an explanatory diagram showing the relationship between a material to be removed and plasma when a hole is formed by the method.
- FIG. 1 shows an embodiment of a laser processing apparatus for carrying out a laser processing method according to the present invention.
- This laser processing apparatus 1 includes an ultrashort pulse laser beam (pulsed) irradiated by a laser apparatus 4.
- a laser apparatus 4 For a workpiece 2 fixed on stage 3 with a pulse laser with a time span of 1 femtosecond or more and 1 picosecond or less (hereinafter referred to as laser beam L), the front surface of workpiece 2 a Irradiated from the side (one side), the workpiece 2 is processed from the rear surface 2b (the other side).
- a lens 5 that condenses the laser light L irradiated by the laser device 4 from the front surface 2 a side.
- the stage 3 is moved along the optical axis direction of the laser L (arrow A) by the stage drive unit 6 such as a motor.
- the stage drive unit 6 such as a motor.
- Work piece 2 and lens 5 are moved relative to each other.
- the laser device 4 and the stage drive unit 6 are controlled by a control device 7 so as to suit the processing conditions.
- the workpiece 2 may be anything as long as the laser beam L irradiated from the laser device 4 is transmitted therethrough.
- the workpiece 2 is the workpiece 2. Plate-shaped transparent quartz glass is used.
- the control device 7 is configured such that the condensing point F by the lens 5 is the rear surface 2 b of the workpiece 2 as shown in FIG. 2 (a). Stage 3 is driven by controlling stage drive unit 6 so that it is on the other side. Then, the control device 7 controls the laser device 4 to irradiate the workpiece 2 with the laser light L.
- control device 7 keeps irradiating the laser beam L, and the workpiece 2 moves backward (on the right side in FIG. 2) at a predetermined speed (processing speed).
- Control stage 3 to move.
- the condensing point F of the laser beam L collected by the lens 5 is relatively directed to the workpiece 2 from the rear surface 2 b side of the workpiece 2 toward the front surface 2 a side. It will move.
- the condensing point F is located on the rear surface 2 b of the work piece 2 by this movement, this part of the work piece 2 is irradiated with the laser light L collected at the condensing point F.
- a multiphoton absorption process is generated and removed, and a hole H is formed in the workpiece 2 as shown in FIG. 2 (b).
- hole H is deeply formed by laser light L collected by lens 5, and the focal point F is When positioned on the front surface 2 a side of the workpiece 2, the hole H penetrates the workpiece 2 as shown in FIG. 2 (d).
- the direction in which the hole H is formed (arrow S 1) and the direction of laser irradiation (arrow II) are reversed as shown in FIG.
- the direction of the pressure generated by the plasma P (arrow P 1) and the scattering direction of the material to be removed (arrow M l) are opposite to the direction in which the hole H is formed.
- the plasma generated by the laser is always present in the processing part irradiated with the laser, and as a result, it is generated upstream in the scattering direction of the processed material. Therefore, scattering of the processed removal material is energized by the pressure of the plasma P (arrow D 1).
- the plasma P promotes the scattering of the processed material to be removed, and the hole H having a high aspect ratio can be formed.
- the material to be removed is scattered backward (2b side), that is, in the direction opposite to the direction in which the lens 5 is arranged. .
- scattered processing removals It is possible to prevent the quality from adhering to the lens 5.
- ultra-short pulse lasers can be processed with little thermal influence, there is little optical damage to the inner periphery of the hole in the workpiece, and holes that do not require post-processing such as mechanical polishing or heat treatment are required. It can be formed.
- the machining method of the present invention can significantly reduce the machining time compared to conventional drilling, etc. It has sex.
- the processing method of the present invention includes aluminum oxide (A 1 2 0 3 ), silicon dioxide (Si 0 2 ), diamond, silicon carbide (SiC), silicon (Si), the material mainly composed of titanium dioxide emissions (Ti0 2) Ru can also that you use as a workpiece. Even for these materials that have high hardness and are difficult to process, the ultrashort pulse laser beam is used. High-precision machining can be performed in time.
- the laser processing method of the present invention can be applied to the formation of products used in various fields, such as the formation of flow paths such as the ⁇ TAS (Micro Total Analysis System) used.
- ⁇ TAS Micro Total Analysis System
- the conditions for Experiment 1 are as follows.
- the laser device 4 used in Experiment 1 uses a femtosecond laser device that emits an ultrashort pulse laser.
- the quartz glass G 1 was irradiated with the laser beam L by the laser processing method described above to form a hole h i having a depth of 3.2 m ⁇ as shown in FIG. As shown in Fig. 4, a hole with a uniform inner diameter could be formed.
- the conventional laser processing method is also executed by the laser processing apparatus 1 described above.
- the control device 7 drives the stage 3 by controlling the stage driving unit 6 so that the condensing point F of the lens 5 is arranged on the front surface 2 a of the workpiece 2. After that, fix it in that position. Then, the control device 7 controls the laser device 4 to irradiate the workpiece 2 with the laser light L.
- control device 7 irradiates the laser beam L for a predetermined time (irradiation). Time) and make a hole in the work piece 2.
- the conditions for Experiment 2 are as follows.
- the laser device 4 used in Experiment 2 is also a femtosecond laser device that irradiates an ultrashort pulse laser.
- the irradiation time is different from 10 s , 30 s, 60 s, 30 00 s, 60 00 s, and the quartz glass G 2 is irradiated with laser light.
- L is irradiated to form a plurality of holes h 2 to h 6.
- the multiple holes h2 to h6 formed by the conventional method have different irradiation times. Regardless, all the depths are the same as 0.785 mm, and it can be seen that it is difficult to form deep holes.
- the hole formed by the processing method of the present invention is 3.2 mm, and the irradiation time for forming the hole h 1 is 32 seconds. As described above, the processing method of the present invention can form a deeper hole in a shorter time than in the prior art.
- any one of the holes h2 to h6 has multiple holes h2 to h6! !
- No. 6 has a tapered hole with an inner diameter that decreases toward the tip.
- quartz glass has been described as an example of the workpiece 2, but the workpiece 2 may be any material that transmits the laser light L, for example, Mainly composed of aluminum oxide (A 1 2 0 3 ), diamond, silicon carbide (S i C), silicon (S i), titanium dioxide (T i 0 2 ), etc.
- the material to be used can be used.
- a substance through which the laser beam L is transmitted or a laser with a specific wavelength may be transmitted.
- the processing method of the present invention can be applied to a material that is not transparent to visible light.
- the workpiece 2 and the lens 5 are relatively moved by moving the workpiece 2, but the workpiece 2 may be moved without being moved. 5 may be configured to move both of them relative to each other.
- the laser processing apparatus 1 is used in the atmosphere.
- the present invention is not limited to this.
- the laser processing apparatus 1 is used in a vacuum. May be used. Industrial applicability
- the ultrashort pulse laser focused on the other side is processed. Machining is performed by moving the workpiece relative to the workpiece so as to face the workpiece.
- the material to be removed from processing is scattered from the opening of the recess toward the outside of the workpiece.
- the plasma generated by the laser is always located upstream of the material to be removed. In other words, since the direction of plasma pressure and the direction of scattering of the processing removal material are almost the same, the plasma promotes the scattering of the processing removal material, and the removal of the processing removal material from the inside of the processed recess. Can be promoted. Therefore, the processing performance of the laser processing method can be improved.
- Deep holes that is, holes with a high aspect ratio can be formed.
- mechanical processing using drills, etc. Compared to the above, holes with a high aspect ratio can be formed in a short time.
- the entrance portion has become a tapered hole having a large diameter.
- plasma promotes the scattering of the processing removal material.
- the processing removal material has little influence on the processing, and a cylindrical hole can be formed.
- ultra-short pulse lasers can be processed with little thermal influence, it is possible to prevent the inner peripheral part of the hole in the workpiece from being damaged by an optical beam. After mechanical polishing or heat treatment, etc. Holes that do not need to be processed can be formed.
- the time required for machining can be significantly reduced compared to conventional drilling.
- the ultrashort pulse laser focused on the other side is processed from the other side of the workpiece, for example, a dent is formed, or the other side is directed from the other side to the one side.
- the focused ultrashort pulse laser is moved relative to the workpiece to form holes in the workpiece, aluminum dioxide (A 1 2 3 ), silicon dioxide (S i 0 2 ), diamond, silicon carbide (S i C), silicon (S i), titanium dioxide (T i 0 2 ) Even materials can be processed with high accuracy without the need for post-processing.
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03788032A EP1535698A1 (en) | 2002-08-06 | 2003-08-04 | Laser processing method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-228311 | 2002-08-06 | ||
JP2002228311A JP2004066293A (ja) | 2002-08-06 | 2002-08-06 | レーザ加工方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004016387A1 true WO2004016387A1 (ja) | 2004-02-26 |
Family
ID=31884321
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/009896 WO2004016387A1 (ja) | 2002-08-06 | 2003-08-04 | レーザ加工方法 |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1535698A1 (ja) |
JP (1) | JP2004066293A (ja) |
WO (1) | WO2004016387A1 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1674193A1 (de) | 2004-12-27 | 2006-06-28 | Siemens Aktiengesellschaft | Verfahren zur Herstellung eines Lochs |
DE102015216130A1 (de) * | 2014-08-22 | 2016-02-25 | Ceramtec-Etec Gmbh | Trennen von Werkstoffen mit transparenten Eigenschaften |
FR3061052B1 (fr) * | 2016-12-28 | 2019-05-31 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Procede d'usinage par laser d'un diamant permettant d'obtenir une surface lisse et transparente |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0863231A1 (en) * | 1997-03-04 | 1998-09-09 | Ngk Insulators, Ltd. | A process for dicing a preform made of an oxide single crystal, and a process for producing functional devices |
JP2001259868A (ja) * | 2000-06-14 | 2001-09-25 | Masaaki Suzuki | 後方誘導散乱光を用いた透明材料のナノオーダ微細加工方法及び加工装置 |
WO2002022301A1 (fr) * | 2000-09-13 | 2002-03-21 | Hamamatsu Photonics K.K. | Procede et dispositif d'usinage par rayonnement laser |
JP2002160079A (ja) * | 2000-11-30 | 2002-06-04 | Laser Gijutsu Sogo Kenkyusho | 薄膜アブレーション加工方法及び装置 |
-
2002
- 2002-08-06 JP JP2002228311A patent/JP2004066293A/ja not_active Withdrawn
-
2003
- 2003-08-04 WO PCT/JP2003/009896 patent/WO2004016387A1/ja not_active Application Discontinuation
- 2003-08-04 EP EP03788032A patent/EP1535698A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0863231A1 (en) * | 1997-03-04 | 1998-09-09 | Ngk Insulators, Ltd. | A process for dicing a preform made of an oxide single crystal, and a process for producing functional devices |
JP2001259868A (ja) * | 2000-06-14 | 2001-09-25 | Masaaki Suzuki | 後方誘導散乱光を用いた透明材料のナノオーダ微細加工方法及び加工装置 |
WO2002022301A1 (fr) * | 2000-09-13 | 2002-03-21 | Hamamatsu Photonics K.K. | Procede et dispositif d'usinage par rayonnement laser |
JP2002160079A (ja) * | 2000-11-30 | 2002-06-04 | Laser Gijutsu Sogo Kenkyusho | 薄膜アブレーション加工方法及び装置 |
Also Published As
Publication number | Publication date |
---|---|
JP2004066293A (ja) | 2004-03-04 |
EP1535698A1 (en) | 2005-06-01 |
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