Title:
OPTICAL LOW-PASS FILTER
Document Type and Number:
Japanese Patent JPH0467009
Kind Code:
A
Abstract:
PURPOSE:To obtain constant optical low-pass effect irrelevantly to wavelength by composing two compound prisms which have periodic structure linearly and specifying the refractive indexes of materials which form respective prisms. CONSTITUTION:Phase grating filters which have prism surfaces arrayed periodically and linearly are combined in the direction of the optical axis so that the prism surfaces contact each other, and cX0.98
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Inventors:
OKAYAMA HIROAKI
ONO SHUSUKE
YONEYAMA MASAYUKI
ONO SHUSUKE
YONEYAMA MASAYUKI
Application Number:
JP17772190A
Publication Date:
March 03, 1992
Filing Date:
July 05, 1990
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G02B27/46; H04N5/238; H04N5/335; H04N5/357; (IPC1-7): G02B27/46; H04N5/238; H04N5/335
Attorney, Agent or Firm:
Shigetaka Awano (1 person outside)
Next Patent: JPH0467010