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:
Mar. 30, 1993
Filed:
Mar. 27, 1992
Tadakazu Kurakake, Tokyo, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A method for manufacturing a single focus collimator in a high precision without increasing a cost for manufacturing. In this method, grooves are on a bulk block member first, and a metallic material having sufficient .gamma. ray shielding property such as lead is casted into the grooves formed on the bulk block member, and then the bulk block member with the metallic material casted into the grooves is immersed into a solvent capable of dissolving the bulk block member but not the metallic material, such that a collimator body formed by the metallic material in a shape of the grooves is obtained as the bulk block member is dissolved by the solvent. The sensitivity of the single focus collimator can be made substantially uniform over the entire effective view field by forming the grooves with such intervals that holes formed on the collimator body have larger size toward a center of the collimator body.