Title:
FILTER
Document Type and Number:
Japanese Patent JPS59177501
Kind Code:
A
Abstract:
A directional filter is constructed with a plurality of grooves (15) extending into a plate (13) from one side (16) thereof. The grooves (15) have a light absorbing characteristic which causes them to absorb light impinging upon the grooves, particularly light impinging upon the grooves (15) from within the plate (13). Since all light passing beyond a certain angle φ must impinge upon the grooves (13), and only a small percentage of light passing parallel to the cut of the grooves (15) would imping upon the grooves (15), the filter has a high ratio of attenuation of unwanted verses wanted light.
Inventors:
RICHIYAADO ROORENSU KOOEN
Application Number:
JP4938184A
Publication Date:
October 08, 1984
Filing Date:
March 16, 1984
Export Citation:
Assignee:
BENDIX CORP
International Classes:
G02B5/00; (IPC1-7): G02B5/00
Attorney, Agent or Firm:
Masaki Yamakawa