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Patent Searching and Data


Title:
BAND-PASS FILTER
Document Type and Number:
Japanese Patent JPH07104122
Kind Code:
A
Abstract:

PURPOSE: To provide the band-pass filter which is composed of.dielectric multilayered films, has a desired pass-band width, has less dependency on polarized light and is good in rising characteristic.

CONSTITUTION: This band-pass filter is constituted by alternately laminating high-refractive index dielectric films and 'low-refractive index dielectric films on both sides of a cavity layer and its central wavelength of the pass band is λ0. The optical film thicknesses of the respective high-refractive index dielectric films and the low-refractive index dielectric film are λ0/4 and the optical film thickness of the cavity layer of integer times λ0/2 is made large within a range larger than 0 and smaller than λ0/2.


Inventors:
NODA HIDEKI
MATSUDA HIROAKI
Application Number:
JP25201593A
Publication Date:
April 21, 1995
Filing Date:
October 08, 1993
Export Citation:
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Assignee:
FUJITSU LTD
International Classes:
G02B5/28; (IPC1-7): G02B5/28
Attorney, Agent or Firm:
Teiichi