Document Type and Number:
Japanese Patent JPH0415923
Kind Code:
B2
Inventors:
YAMADA YASUYUKI
Application Number:
JP12856282A
Publication Date:
March 19, 1992
Filing Date:
July 23, 1982
Export Citation:
Assignee:
CANON KK
International Classes:
G02B9/12; G02B9/20
Next Patent: JPH0415924