Title:
FRESNEL LENS AND METAL MOLD MANUFACTURING UNIT
Document Type and Number:
Japanese Patent JPS524246
Kind Code:
A
Abstract:
PURPOSE: To easily manufacture Fresnel lens of which light from the focus is parallel to the optical axis, by cutting guided by one edge of the sliding plate notch.
Inventors:
ISHIBASHI HIROAKI
HIRANO HITOSHI
HIRANO HITOSHI
Application Number:
JP8022075A
Publication Date:
January 13, 1977
Filing Date:
June 27, 1975
Export Citation:
Assignee:
SONY CORP
International Classes:
B29C33/00; B24B13/00; B29C39/00; B29C39/24; B29C39/26; B29C43/02; B29C43/36; B29C59/00; B29C61/00; B29D11/00; G02B3/08; (IPC1-7): G02B3/08
Next Patent: AUTOMATIC FOCUS ADJUSTER UNIT