Title:
OBJECT OPTICAL ELEMENT AND OPTICAL PICKUP DEVICE
Document Type and Number:
WIPO Patent Application WO/2004/040563
Kind Code:
A1
Abstract:
Downsizing of an optical pickup device is made compatible with ensuring of aberration characteristics by irradiating an object lens (OBJ) with a light flux having a small divergent angle. More specifically, since its optical system magnification m1 is at least the lower limit (-1/7), a deterioration in aberration characteristics can be restricted even when, for example, a light flux from a light source is beamed with its center deviated or inclined from the axis of the object lens (OBJ). In addition, since an optical system magnification m1 is up to the upper limit (-1/25), a sufficient distance can be ensured between the object lens (OBJ) and an optical information recording medium (D).
Inventors:
MIMORI MITSURU
OTA KOHEI
SAITO SHINICHIRO
ATARASHI YUICHI
SAKAMOTO KATSUYA
TOTSUKA HIDEKAZU
IKENAKA KIYONO
OTA KOHEI
SAITO SHINICHIRO
ATARASHI YUICHI
SAKAMOTO KATSUYA
TOTSUKA HIDEKAZU
IKENAKA KIYONO
Application Number:
PCT/JP2003/013601
Publication Date:
May 13, 2004
Filing Date:
October 24, 2003
Export Citation:
Assignee:
KONICA MINOLTA HOLDINGS INC (JP)
International Classes:
G11B7/135; G11B7/00; G11B7/125; (IPC1-7): G11B7/135
Foreign References:
| JP2002203331A | 2002-07-19 | |||
| JP2002288867A | 2002-10-04 | |||
| JP2003215447A | 2003-07-30 | |||
| JP2003248168A | 2003-09-05 | |||
| JP2003344760A | 2003-12-03 |
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