US5535233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser device
Assignee: Komatsu Ltd
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Filing: 1993-10-04
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Granted: 1996-07-09
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Expires: 2013-10-04
Abstract
Abstract A laser device is capable reducing fluctuation of the beam width of the output laser beam due to abrasion of its discharge electrodes. A part of the contour shape of a section perpendicular to the longitudinal axis of the chamber of the laser device in at least one of the electrodes, which part confronts the other one of the electrodes, has a shape of a circular arc having a predetermined radius. The width of at least one of the two electrode may be substantially equal to the width of electric discharge taken place between the electrodes. Further, a conductor member may be disposed on each side of the electrode along its longitudinal axis to reduce electric field strength therearound.
Inventors
- 👤 Hakaru Mizoguchi
- 👤 Yoshiho Amada
- 👤 Noritoshi Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:24
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/02; H01S3/03; H01S3/038; H01S3/0385; H01S3/09; H01S3/097; H01S3/0971
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
126 words
A laser device of the type in which an electric discharge takes place between a pair of electrodes to excite a laser gas in a laser chamber thereby producing a laser beam, wherein a part of a contour shape of a section perpendicular to the longitudinal axis of the laser chamber in at least one of the pair of electrodes, which part confronts the other one of the electrodes, has a shape of a circular arc, wherein the contour shape includes a straight line portion, and wherein straight line portions which are not parallel with each other or a straight line portion and the circular arc are connected to each other by a circular arc with a radius smaller than that of the first-mentioned circular arc.
Claim 2
Dependent Claim
126 words
A laser device of the type in which an electric discharge takes place between a pair of electrodes to excite a laser gas in a laser chamber thereby producing a laser beam, wherein a part of a contour shape of a section perpendicular to the longitudinal axis of the laser chamber in at least one of the pair of electrodes, which part confronts the other one of the electrodes, has a shape of a circular arc, wherein the contour shape includes a straight line portion, and wherein straight line portions which are not parallel with each other or a straight line portion and the circular arc are connected to each other by a circular arc with a radius smaller than that of the first-mentioned circular arc.
Claim 3
Dependent Claim
25 words
A laser device according to claim 1, wherein the radius of the circular arc is less than the distance between the pair of the electrodes.
Claim 4
Dependent Claim
33 words
A laser device according to claim 1, wherein the laser device includes an optical resonator provided with a wavelength selective device for reducing a bandwidth of the oscillating wavelength of the laser beam.
Claim 5
Dependent Claim
178 words
A laser device of the type in which electric discharge takes place between a pair of electrodes disposed along a longitudinal direction of a laser chamber of the laser device one above another in the vertical direction to excite a laser gas in the laser chamber thereby producing a laser beam, wherein at least one of the pair of electrodes has left and right side faces disposed in parallel with the longitudinal direction of the laser chamber, the side faces being flat planes which are disposed in parallel with the vertical direction and with each other, a part of the contour shape of a section perpendicular to the longitudinal axis of the chamber in at least one of the electrodes, which part confronts the other one of the electrodes, having a shape of an elliptical arc, a longer diameter thereof being equal to the width of said at least one of the pair of electrodes and a shorter diameter thereof being coincident with a vertical center axis of the section of said at least one of the electrodes.
Claim 6
Dependent Claim
178 words
A laser device of the type in which electric discharge takes place between a pair of electrodes disposed along a longitudinal direction of a laser chamber of the laser device one above another in the vertical direction to excite a laser gas in the laser chamber thereby producing a laser beam, wherein at least one of the pair of electrodes has left and right side faces disposed in parallel with the longitudinal direction of the laser chamber, the side faces being flat planes which are disposed in parallel with the vertical direction and with each other, a part of the contour shape of a section perpendicular to the longitudinal axis of the chamber in at least one of the electrodes, which part confronts the other one of the electrodes, having a shape of an elliptical arc, a longer diameter thereof being equal to the width of said at least one of the pair of electrodes and a shorter diameter thereof being coincident with a vertical center axis of the section of said at least one of the electrodes.
Claim 7
Dependent Claim
29 words
A laser device according to claim 4, wherein the ratio of the longer diameter to the shorter diameter of the ellipse falls within a range between one and four.
Claim 8
Dependent Claim
112 words
A laser device of the type in which electric discharge takes place between a pair of electrodes disposed along a longitudinal direction of a laser chamber of the laser device one above another in the vertical direction to excite a laser gas in the laser chamber thereby producing a laser beam, wherein at least one of the pair of electrodes has left and right side faces disposed in parallel with the longitudinal direction of the laser chamber, the side faces being flat planes which are disposed in parallel with the vertical direction and with each other, the width of said one electrode being less than the distance between the pair of electrodes.
Claim 9
Dependent Claim
112 words
A laser device of the type in which electric discharge takes place between a pair of electrodes disposed along a longitudinal direction of a laser chamber of the laser device one above another in the vertical direction to excite a laser gas in the laser chamber thereby producing a laser beam, wherein at least one of the pair of electrodes has left and right side faces disposed in parallel with the longitudinal direction of the laser chamber, the side faces being flat planes which are disposed in parallel with the vertical direction and with each other, the width of said one electrode being less than the distance between the pair of electrodes.
Claim 10
Dependent Claim
121 words
A laser device of the type in which electric discharge takes place between a pair of electrodes disposed along a longitudinal direction of a laser chamber of the laser device one above another in the vertical direction to excite a laser gas in the laser chamber thereby producing a laser beam, wherein at least one of the pair of electrodes has left and right side faces disposed in parallel with the longitudinal direction of the laser chamber, the side faces being flat planes which are disposed in parallel with the vertical direction and with each other, the laser device including an optical resonator provided with a wavelength selective device for reducing a bandwidth of the oscillating wavelength of the laser beam.
Claim 11
Dependent Claim
121 words
A laser device of the type in which electric discharge takes place between a pair of electrodes disposed along a longitudinal direction of a laser chamber of the laser device one above another in the vertical direction to excite a laser gas in the laser chamber thereby producing a laser beam, wherein at least one of the pair of electrodes has left and right side faces disposed in parallel with the longitudinal direction of the laser chamber, the side faces being flat planes which are disposed in parallel with the vertical direction and with each other, the laser device including an optical resonator provided with a wavelength selective device for reducing a bandwidth of the oscillating wavelength of the laser beam.
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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) | 1999-07-09 | 2000-01-08 | 2000-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-09 | 2004-01-08 | 2004-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-09 | 2008-01-08 | 2008-07-09 | $7700.00 | Window Closed / Lapsed |