Title:
OPTICAL PARTS
Document Type and Number:
Japanese Patent JPH02189503
Kind Code:
A
Abstract:
PURPOSE:To provide the required spectroscopic characteristics of a transmissivity and reflectivity with a small number of layers by sticking a chromium oxide layer or silicon film onto a transparent glass substrate and forming multilayered dielectric films consisting of alternate layers onto this chromium oxide layer or silicon layer. CONSTITUTION:The chromium oxide film 2 or silicon film is stuck onto the transparent glass substrate 1 so that the transmissivity of a UV or visible region and IR rays is lowered flat. The multiplayered dielectric films laminated repeatedly with the alternate layers of TiO2 films 3 which a;re high-refractive index material films and SiO2 films 4 which are low-refractive index material films are formed on the surface thereof. An SiO2 film 5 is further formed as the final layer. The film constitution having the spectroscopic characteristics of the required transmissivity and reflectivity is attained with the smaller num ber of the layers and the productivity is improved; in addition, the peeling of the films is prevented and the environmental resistance is improved.
Inventors:
YAMAMOTO KATSUYOSHI
TAKEMOTO TETSUO
TAKEMOTO TETSUO
Application Number:
JP1017989A
Publication Date:
July 25, 1990
Filing Date:
January 19, 1989
Export Citation:
Assignee:
TOSHIBA CORP
International Classes:
G02B5/08; G02B5/28; (IPC1-7): G02B5/08; G02B5/28
Attorney, Agent or Firm:
Takehiko Suzue (3 outside)