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:
Dec. 28, 1999
Filed:
Mar. 26, 1998
Nobuaki Ogushi, Utsunomiya, JP;
Takayuki Hasegawa, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An X-ray system includes a radiation source for producing a radiation beam containing X-rays, a mirror device for reflecting X-rays, a beam duct for introducing the X-rays reflected by the mirror device, to an irradiation zone where an object to be irradiated can be exposed, and a shutter capable of blocking the radiation beam. A protection wall is disposed downstream of the mirror device with respect to the radiation source, for blocking the radiation beam. When the protection wall has a thickness t, the beam duct passing through the protection wall has an opening size a, and the beam duct has a tilt angle .theta., there is a relation (t-t.sub.0) sin .theta..gtoreq.a, where t.sub.0 is a minimum thickness of the protection wall required to substantially block the radiation beam from a radiation source.