Title:
UNMAGNIFICATION IMAGING ELEMENT
Document Type and Number:
Japanese Patent JPH0375721
Kind Code:
A
Abstract:
PURPOSE:To decrease chromatic aberrations by forming lenses which are provide in proximity to each other and which have the refractive indices varying from each other and have the dispersion coefft. of the same code and setting the independent focal lengths of these lenses so to vary in code from each other. CONSTITUTION:The lens arrays 6a, 6b are provided in proximity to each other. The lens arrays 6a, 6b have the refractive indices varying from each other and have the same code of the dispersion coefft. The independent focal lengths of the lens arrays 6a, 6b are so set in curvature as to have the codes varying from each other. A diaphragm plate 8 is provided between the lens array 6a and the lens array 6b. The same imaging plane with respect to various wavelengths is provided in the lens system synthesized of the lens array 6a and the lens array 6b in such a manner, by which the chromatic aberrations are decreased.
Inventors:
FUJITA KAZUHIRO
MIYASHITA TAKAAKI
MIYASHITA TAKAAKI
Application Number:
JP21263389A
Publication Date:
March 29, 1991
Filing Date:
August 18, 1989
Export Citation:
Assignee:
RICOH KK
International Classes:
G02B17/08; G02B27/18; (IPC1-7): G02B17/08; G02B27/18
Attorney, Agent or Firm:
Akira Kashiwagi
Next Patent: JPH0375722