Imaging optical device

Application Number: 00120698
Application Date: 2000.12.20
Publication Number: 1308241
Publication Date: 2001.08.15
Priority Information: 1999/12/20 JP 361813/99
International: G02B13/24;G02B3/00
Applicant(s) Name: Nippon Sheet Glass Co., Ltd.
Inventor(s) Name: Kitaka Shigeo
Patent Agency Code: 72001
Patent Agent: wang yong
Abstract A high performance optical imaging system can be provided by minimizing the overlapping degree m, increasing the quantity of light of the rod lens array and improving the resolving power while taking into account the irregularity of the quantity of light when a dislocation between a sensor and an optical axis of an entire rod lens array occurs. In the optical imaging system, a plurality of rod lenses with a refractive index distribution in the radial direction are arranged in two rows in a rod lens array with their optical axes in parallel to each other. This optical imaging system focuses light from a manuscript plane onto an image plane, the planes being arranged on the two sides of the rod lens array. The overlapping degree m defined as the following equation (Eq. 10) is in a range of 0.91<=m<=1.01; (Eq. 10)m=X0/2R, wherein X0 denotes an image radius that the rod lenses project onto the image plane and 2R denotes a distance between the optical axes of neighboring rod lenses.