摘要:
In an optical scanning apparatus, a scanning lens (1) is composed of three lens elements. The centrally located lens element of the scanning lens (1) has a refractive power in the direction (y) for correcting the surface tilt, that is an inverted number of a focal length that is changed in accordance with the scanning view angle, whereby curvature of field is well corrected and RMS spot diameters on the scanning surface (17) may be small. In addition, even if the view angle is increased, imaging characteristics may be kept at a high resolving power.
摘要:
An optical system and an optical information processing equipment utilizing the same are disclosed. The optical system comprises a laser diode (1) and a hologram lens (5, 11, 51, 93) has an interference fringe prepared by the interference of a beam having substantially the same intensity distribution and/or phase characteristic as that of a laser beam emitted from the laser diode with a beam having a desired characteristic. The laser beam from the laser diode is irradiated on the hologram lens so that its characteristic is converted into the desired characteristic.
摘要:
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 (4), the optical thickness nd of a transparent protective film (5) formed on the reflecting surface is made substantially equal to mλ/2 (where n, d, m, and λ indicate the refractive index ofthe 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 atan angle of about +45°to -45°to a direction perpendicular to the plane of incidence of the linearly-polarized light.
摘要:
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 (4), the optical thickness nd of a transparent protective film (5) formed on the reflecting surface is made substantially equal to mλ/2 (where n, d, m, and λ indicate the refractive index ofthe 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 atan angle of about +45°to -45°to a direction perpendicular to the plane of incidence of the linearly-polarized light.
摘要:
A polygonal mirror and a method of manufacturing the same are disclosed in which a machined mirror surface (2) of an aluminum substrate or block (1) is anodized to form a transparent film (3) for protecting the mirror surface (2).
摘要:
A lens-on-disc type optical scanner comprises a plurality of lenses (9) of predetermined surface profile arranged on a disc (8) along the circumferential direction of the disc. The disc (8) is rotated so that a laser beam from a laser beam source (15) passes sequentially through the lenses (9) for optical scanning.