US4806724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser beam machining device
Assignee: MIYAMA & Co Ltd 21-12 BIJOGI 5-CHOME TODA-SHI SAITAMA-KEN JAPAN
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Filing: 1987-08-11
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Granted: 1989-02-21
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Expires: 2007-08-11
Abstract
Abstract A laser beam machining device employs a laser for generating a laser beam, a chopper device for intermittently blocking the laser beam for intermittently irradiating the laser beam onto the surface of a work, and an assisting gas discharge device for injecting assisting gas toward the point, on which the laser beam is irradiated. By locating the chopper upstream of the primary condenser and away from the assist gas flow, the assist gas to be discharged toward the predetermined point of the work, on which the laser beam is irradiated, is not disturbed which otherwise would cause turbulence to degrade the precision of the laser beam machining operation. In addition, the assisting gas discharging device is so arranged as to direct the assist gas flow substantially along the axis of the laser beam to be irradiated onto the work surface.
Inventors
- 👤 Yoshito Kawai
- 👤 Akira Kishida
- 👤 Shiroh Yokoama
- 👤 Ichiku Yokoyama
- 👤 Goudai Yokoyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:02
CPC Classifications
G; G02; G02B; G02B19/00; G02B19/0033; B; B23; B23K; B23K26/00; B23K26/02; B23K26/06; B23K26/064; B23K26/0643; B23K26/0648; B23K26/0665; B23K26/08; B23K26/0823; G02B19/0004; G02B19/0019; G02B19/0023; G02B26/00; G02B26/02; G02B26/04; B21; B21B; B21B27/00; B21B27/005
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
171 words
A laser beam machining device comprising: a laser beam source generating a laser beam; means for defining a laser beam path; an optical primary condenser disposed within the laser beam for condensing the laser beam to irradiate onto a predetermined point on a work object; an assist gas discharge means for discharging an assist gas toward said predetermined point on the work object; a mechanical chopper having a rotary chopper disc disposed in said laser beam path and oriented upstream of said optical condenser for intermittently establishing and blocking said laser beam path so that the laser beam may be intermittently irradiated onto the predetermined point on said work object; an auxiliary condenser provided in said laser beam path upstream of said chopper, which auxiliary condenser has a focal distance approximately corresponding to the distance to said chopper disc, a diffuser provided in said laser beam path and downstream of said chopper, which diffuser passes a parallel beam to said primary condenser; and wherein said primary condenser comprises a condenser mirror.
Claim 2
Dependent Claim
171 words
A laser beam machining device comprising: a laser beam source generating a laser beam; means for defining a laser beam path; an optical primary condenser disposed within the laser beam for condensing the laser beam to irradiate onto a predetermined point on a work object; an assist gas discharge means for discharging an assist gas toward said predetermined point on the work object; a mechanical chopper having a rotary chopper disc disposed in said laser beam path and oriented upstream of said optical condenser for intermittently establishing and blocking said laser beam path so that the laser beam may be intermittently irradiated onto the predetermined point on said work object; an auxiliary condenser provided in said laser beam path upstream of said chopper, which auxiliary condenser has a focal distance approximately corresponding to the distance to said chopper disc, a diffuser provided in said laser beam path and downstream of said chopper, which diffuser passes a parallel beam to said primary condenser; and wherein said primary condenser comprises a condenser mirror.
Claim 3
Dependent Claim
39 words
A laser beam machining device as set forth in claim 1, wherein said assist gas discharge means discharges said assist gas substantially along an axis of the laser beam to be irradiated onto said predetermined point of the work.
Claim 4
Dependent Claim
48 words
A laser beam machining device as set forth in claim 4, which further comprises a torch having an end opposing said predetermined point of the work, said torch being formed with a through opening for passing said laser beam condensed by said primary condenser and said assist gas.
Claim 5
Dependent Claim
19 words
A laser beam machining device as set forth in claim 1, wherein said primary condenser comprises a condenser lens.
Claim 6
Dependent Claim
19 words
A laser beam machining device as set forth in claim 1, wherein said auxiliary condenser comprises a condenser lens.
Claim 7
Dependent Claim
18 words
A laser beam machining device as set forth in claim 1, wherein said diffuser comprises a diffuser lens.
Claim 8
Dependent Claim
33 words
A laser beam machining device as set forth in claim 1, wherein said primary condenser comprises a condenser lens, said auxiliary condenser comprises a condenser lens and said diffuser comprises a diffuser lens.
Claim 9
Dependent Claim
19 words
A laser beam machining device as set forth in claim 1, wherein said auxiliary condenser comprises a condenser mirror.
Claim 10
Dependent Claim
18 words
A laser beam machining device as set forth in claim 1, wherien said diffuser comprises a diffuser mirror.
Claim 11
Dependent Claim
33 words
A laser beam machining device as set forth in claim 1, wherein said primary condenser comprises a condenser mirror, said auxiliary condenser comprises a condenser mirror and said diffuser comprises a diffuser mirror.
Claim 12
Independent Claim
257 words
An apparatus for making a work roll having a predetermined roughness and a regularly and geometrically patterned uneven surface for temper rolling of a metal sheet, comprising: a support means for rotatably supporting a material roll; a drive means associated with said support means for rotatingly driving said material roll at a given speed; a laser machining device for irradiating a laser beam on a predetermined position on said material roll so as to form uneven sections constituted of a depression and an annular projection surrounding said depression for dulling the surface of said work roll, said laser machining device including: a laser beam source generating a laser beam; means for defining a laser beam path; an optical primary condenser disposed within the laser beam for condensing the laser beam to irradiate onto a predetermined point on said work roll; an assist gas discharge means for discharging an assist gas toward said predetermined point on the work roll; a mechanical chopper having a rotary chopper disc disposed in said laser beam path and oriented upstream of said optical condenser for intermittently establishing and blocking said laser beam path so that the laser beam may be intermittently irradiated onto the predetermined point on said work, an auxiliary condenser provided in said laser beam path upstream of said chopper, which auxiliary condenser has a focal distance approximately corresponding to the distance to said chopper disc, and a diffuser provided in said laser beam path and downstream of said chopper, which diffuser passes a parallel beam to said primary condenser.
Claim 13
Independent Claim
257 words
An apparatus for making a work roll having a predetermined roughness and a regularly and geometrically patterned uneven surface for temper rolling of a metal sheet, comprising: a support means for rotatably supporting a material roll; a drive means associated with said support means for rotatingly driving said material roll at a given speed; a laser machining device for irradiating a laser beam on a predetermined position on said material roll so as to form uneven sections constituted of a depression and an annular projection surrounding said depression for dulling the surface of said work roll, said laser machining device including: a laser beam source generating a laser beam; means for defining a laser beam path; an optical primary condenser disposed within the laser beam for condensing the laser beam to irradiate onto a predetermined point on said work roll; an assist gas discharge means for discharging an assist gas toward said predetermined point on the work roll; a mechanical chopper having a rotary chopper disc disposed in said laser beam path and oriented upstream of said optical condenser for intermittently establishing and blocking said laser beam path so that the laser beam may be intermittently irradiated onto the predetermined point on said work, an auxiliary condenser provided in said laser beam path upstream of said chopper, which auxiliary condenser has a focal distance approximately corresponding to the distance to said chopper disc, and a diffuser provided in said laser beam path and downstream of said chopper, which diffuser passes a parallel beam to said primary condenser.
Claim 14
Dependent Claim
36 words
An apparatus as set forth in claim 11, wherein said assist gas discharge means discharges said assist gas substantially along an axis of the laser beam to be irradiated onto said predetermined point of the work.
Claim 15
Dependent Claim
50 words
An apparatus as set forth in claim 12, wherein said laser beam machining device further comprises a torch having an end opposing said predetermined point of the work, said torch being formed with a through opening for passing said laser beam condensed by said primary condenser and said assist gas.
Claim 16
Dependent Claim
30 words
An apparatus as set forth in claim 11, wherein said primary condenser comprises a condenser lens, said auxiliary condenser comprises a condenser lens and said diffuser comprises a diffuser lens.
Claim 17
Dependent Claim
30 words
An apparatus as set forth in claim 11, wherein said primary condenser comprises a condenser mirror, said auxiliary condenser comprises a condenser mirror and said diffuser comprises a diffuser mirror.
Claim 18
Dependent Claim
36 words
An apparatus as set forth in claim 11, wherein said laser beam machining device is adapted to generate said laser beam having energy density in a range of 5×10 4 to 9×10 6 W/cm 2 .
Claim 19
Dependent Claim
34 words
An apparatus as set forth in claim 11, which further comprises a second driving means for causing relative displacement between sid material roll and said laser system in axisl direction at a predetermined pitch.
Claim 20
Dependent Claim
105 words
An apparatus as set forth in claim 11, which is so designed as to form a work roll having a peripheral surface formed with a plurality of uneven sections in a spaced apart relationship to each other, each uneven section being constituted of a depression and an annular ring shaped projection surrounding said depression, said uneven sections being arranged to have a ratio between a center-to-center distance between adjacent uneven sections and the external size of an uneven section in the range of 0.85 to 1.7, and said uneven sections having a difference between the center-to-center distance and the external size smaller than 280 m.
Claim 21
Dependent Claim
140 words
A laser beam machining device comprising: a laser beam source generating a laser beam; means for defining a laser beam path; an optical primary condenser disposed within the laser beam for condensing the laser beam to irradiate onto a predetermined point on a work object; an assist gas discharge means of discharging an assist gas toward said predetermined point on the work object; a mechanical chopper having a rotary chopper disc disposed in said laser beam path and oriented upstream of said optical condenser for intermittently establishing and blocking said laser beam path so that the laser beam may be intermittently irradiated onto the predetermined point on said work object; and an auxiliary condenser provided in said laser beam path upstream of said chopper, which auxiliary condenser has a focal distance approximately corresponding to the distance to said chopper disc.
Claim 22
Dependent Claim
140 words
A laser beam machining device comprising: a laser beam source generating a laser beam; means for defining a laser beam path; an optical primary condenser disposed within the laser beam for condensing the laser beam to irradiate onto a predetermined point on a work object; an assist gas discharge means of discharging an assist gas toward said predetermined point on the work object; a mechanical chopper having a rotary chopper disc disposed in said laser beam path and oriented upstream of said optical condenser for intermittently establishing and blocking said laser beam path so that the laser beam may be intermittently irradiated onto the predetermined point on said work object; and an auxiliary condenser provided in said laser beam path upstream of said chopper, which auxiliary condenser has a focal distance approximately corresponding to the distance to said chopper disc.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |