Scattered ray removal grid and method of producing the same

• US 20030035512A1
• Filed: 01/27/2000
• Published: 02/20/2003
• Est. Priority Date: 01/27/1999
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Kohda, Katsuhiro
• Granted Patent: US 6,594,878 B2
• Time in Patent Office: Days
• US Class Current: 378/155
• CPC Class Codes: G21K 1/025 using multiple collimators, e.g. Bucky screens; other devices for eliminating undesired or dispersed radiation
• CPC Class Codes: G21K 1/10 Scattering devices; Absorbing devices; Ionising radiation filters
• CPC Class Codes: Y10T 156/1048 to form dished or receptacle-like product
• CPC Class Codes: Y10T 156/1075 of plural laminae from single stock and assembling to each other or to additional lamina
• CPC Class Codes: Y10T 29/49798 Dividing sequentially from leading end, e.g., by cutting or breaking
• CPC Class Codes: Y10T 29/4998 Combined manufacture including applying or shaping of fluent material

Abstract

A scattered ray removal grid that has an overall shape of constant spherical curvature. The scattered ray removal grid has radiation absorbing portions arrayed in a lattice configuration and radiation non-absorbing portions made of thermoplastic resin disposed between the radiation absorbing portions and can therefore be easily produced to have an overall spherical shape at low cost.

Claims

1. A scattered ray removal grid formed in an overall shape of constant spherical curvature.

2. A method of producing a scattered ray removal grid comprising:

a step of forming a plate-like grid having thermoplastic resin interposed between grid elements and placing the plate-like grid between a set of dies having surfaces of complementary spherical curvature of prescribed radii,

a step of causing the set of dies to form the grid into a shape having spherical curvature of a prescribed radius by pressing and heating the grid to its softening temperature, and

a step of cooling the grid formed in a spherical shape.