Title:
【発明の名称】フレネルレンズ
Document Type and Number:
Japanese Patent JP2901727
Kind Code:
B2
Inventors:
AMANO YASUO
YOSHII MASAKI
NISHIGUCHI TAKASHI
TAKASU KEIJI
SHIBA MASATAKA
YOSHII MASAKI
NISHIGUCHI TAKASHI
TAKASU KEIJI
SHIBA MASATAKA
Application Number:
JP24709290A
Publication Date:
June 07, 1999
Filing Date:
September 19, 1990
Export Citation:
Assignee:
HITACHI SEISAKUSHO KK
International Classes:
G02B3/08; B23B5/00; G03B21/62; G03B21/625; (IPC1-7): G03B21/62; G02B3/08
Domestic Patent References:
| JP61130903A | ||||
| JP6440835U |
Attorney, Agent or Firm:
Katsuo Ogawa (1 person outside)