Optical device with absorption gradient and selection spectrum filter and lens group and camera

Application Number: 00106929
Application Date: 2000.04.21
Publication Number: 1271103
Publication Date: 2000.10.25
Priority Information: 1999/4/21 EP 99107887.4
International: G02B1/10;G02B5/20
Applicant(s) Name: Asulab S. A.
Inventor(s) Name: H. Buckzek;J. Grup
Patent Agency Code: 72001
Patent Agent: luo peng
Abstract The present invention concerns an optical device intended for homogenising the lighting in an image plane, in particular defined by a digital optical sensor, characterised in that it is formed of a block made of transparent homogenous filtering material, this block having a substantially uniform absorption coefficient for all the wavelengths of the visible optical spectrum which pass through it, and having a variable thickness suited to a determined absorption profile.