1984-02-08
1986-06-03
Corbin, John K.
350 68, G02F 100
Patent
active
045926220
ABSTRACT:
A light-beam scanning apparatus is disclosed in which a mirror surface of a metal having a characteristic that the reflectance of the mirror surface increases as the incident angle of light incident on the mirror surface is larger, is used as a reflecting surface, the optical thickness nd of a transparent protective film formed on the reflecting surface is made substantially equal to m.lambda./2 (where n, d, m and .lambda. indicate the refractive index of the protective film, the thickness of the protective film, an integer, and the wavelength of the incident light, respectively), the incident light is linearly-polarized light, and the direction of vibration of the linearly-polarized light is inclined at an angle of about +40.degree. to -40.degree. to a direction perpendicular to the plane of incidence of the linearly-polarized light.
REFERENCES:
patent: 4093350 (1978-06-01), Fisli
patent: 4202597 (1980-05-01), Moore
patent: 4294506 (1981-10-01), Hattori
patent: 4322130 (1982-03-01), Ito et al.
Journal of The Optical Society of America, vol. 72, No. 1, Jan. 1982, pp. 27-39.
Arimoto Akira
Hashimoto Akira
Morita Kenji
Saito Susumu
Ben Loha
Corbin John K.
Hitachi , Ltd.
Hitachi Koki Co,. Ltd.
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