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Patent Searching and Data


Title:
OBJECTIVE LENS, OPTICAL PICKUP DEVICE AND OBJECTIVE LENS MANUFACTURING METHOD
Document Type and Number:
Japanese Patent JP2002365406
Kind Code:
A
Abstract:

To provide an objective lens whose structure is very simple, which is made small and light though it is equipped with a heat radiation mechanism, and which is made immune to vibration and shock from the outside and very reliable as an objective lens for optical pickup capable of realizing high recording density.

As for this objective lens 1 equipped with a plurality of lens parts 3 and 4 and having high NA, heat generated from a spot on an optical disk 2 is radiated to the air from a radiation fin 6 formed on the opposed surface side of the disk 2 even when it is transmitted to the lens 1, so that the temperature rise of the lens 1 is restrained. Furthermore, since the structure of the lens 1 is very simple, the lens 1 is made small and light.


Inventors:
KIYOZAWA YOSHIYUKI
Application Number:
JP2001176524A
Publication Date:
December 18, 2002
Filing Date:
June 12, 2001
Export Citation:
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Assignee:
RICOH KK
International Classes:
G03F7/20; G02B1/00; G02B3/00; G11B7/135; G11B7/22; G11B11/105; (IPC1-7): G02B3/00; G02B1/00; G03F7/20; G11B7/135; G11B7/22; G11B11/105
Attorney, Agent or Firm:
Masashi Kashiwagi (2 others)