Optic pick-up device, recording and reproducing device and light focusing system and coupling lens

Application Number: 00120420
Application Date: 2000.07.07
Publication Number: 1280363
Publication Date: 2001.01.17
Priority Information: 1999/7/9 JP 195257/1999
International: G02B3/10;G11B7/135
Applicant(s) Name: Konica Corp.
Inventor(s) Name: Arai Noriichi
Patent Agency Code: 11038
Patent Agent: ma gao
Abstract An optical pickup apparatus for conducting recording and/or reproducing for an optical information recording medium is provided with a light source; a coupling optical system to change a divergent angle of light flux emitted from the light source; an objective lens optical system for converging the light flux having passed through the coupling optical system on a information recording surface of the optical information recording medium; and a photo detector to detect the reflected light from the information recording surface of the optical information recording medium. Each of these optical system includes at least one resin-made lens having a positive refractive power and also a zonal diffraction face having a negative diffraction power.