The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 31, 2001
Filed:
Aug. 28, 1998
Tadashi Ichikawa, Aichi, JP;
Hiroshi Ito, Aichi, JP;
Kabushiki Kaisha Toyota Chuo Kenkyusho, Aichi-gun, JP;
Abstract
A method of forming a groove having a desired cross section easily and rapidly, by making laser beam scan in the longitudinal direction of the groove. In the method, a laser beam,is irradiated to a work,to form a groove,. When the longitudinal and the width direction of the groove is the x-axis and the y-axis, respectively, an intensity distribution of the laser beam in an irradiated region Q on the work is expressed by f(x, y). An integral of f(x, y) with respect to x, i.e., g(y), is proportional to a depth distribution of the groove,, d(y), and the intensity distribution f(x, y) is formed by passing the laser beam,through a mask pattern,which has an appropriate transmission factor distribution. The groove,is formed by moving the region Q in the x-axis direction. The cross section of the groove,is determined by the mask pattern,. And the groove,, having a desired cross section, is obtained in one scanning in the x-axis direction.