Title:
OPTICAL FILTER
Document Type and Number:
Japanese Patent JPH0519210
Kind Code:
A
Abstract:
PURPOSE:To reduce the influence of a ghost light without performing a post- processing of a reflection preventive film, etc., to an optical, filter, and also, to curtail the number of lens pieces of photographic lenses. CONSTITUTION:At least one face 10A of an optical filter 10 of a phase type is formed to a curved surface containing a spherical surface. As a result light reflected by the reverse side 10B and the surface 10A of its optical filter 10 comes not to for an image in the vicinity of the image forming surface and a ghost light comes to scarcely appear theoretically. Also, when at least one face 10A is designed so as to become a desired spherical surface or a spherical surface, the optical filter 10 can be used as a lens, and the number of lens pieces of photographic lenses can be curtailed.
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Inventors:
TAKATORI NAOKI
ORIMOTO MASAAKI
ORIMOTO MASAAKI
Application Number:
JP17539991A
Publication Date:
January 29, 1993
Filing Date:
July 16, 1991
Export Citation:
Assignee:
FUJI PHOTO FILM CO LTD
International Classes:
G02B3/02; G02B13/18; G02B27/00; G02B27/46; (IPC1-7): G02B3/02; G02B13/18; G02B27/00; G02B27/46
Domestic Patent References:
| JPH04309912A | 1992-11-02 |
Attorney, Agent or Firm:
Kenzo Matsuura
Next Patent: JPH0519211