US 4,054,361 AGranted

Beam scanning device with line image formed by and reflected to optical element

AssigneeFuji Photo Film Co., Ltd.

InventorMasaru Noguchi

Life of this patent

Estimating the term…

Loading patent…

Abstract

A beam scanning device comprises a rotating multi-face mirror, a single optical element having major and minor axes of different focal length and an image forming optical system. A beam of collimated light is passed through or reflected by the single optical element a first time to form a line image on the rotating multi-face mirror. The reflected beam of light issuing from the line image is passed through or reflected by the single optical element a second time and the resulting collimated beam is passed through the image forming optical system to form a light spot on the image plane. As the rotating multi-face mirror is rotated, the light spot successively scans the image plane without any displacement of the scanning lines resulting from error in parallelism of the rotating multi-face mirror.

Claims9

Dependent claims

A beam scanning device comprising in combination:

a light source for generating a light beam,
a rotating multi-face mirror for reflecting and deflecting the light beam,
an optical element having major and minor axes of different focal length located between the light source and the rotating multi-face mirror for forming on the reflecting surface of the rotating multi-face mirror a line image perpendicular to the axis of rotation of the rotating multi-face mirror and for receiving the light beam reflected and deflected by the rotating multi-face mirror and transforming it into a deflected beam of collimated light, and
a focusing system for focusing the deflected beam of collimated light and producing a scanning light spot on the focal plane thereof,
whereby the scanning lines produced by the scanning light spot are not displaced in the direction perpendicular to the direction of scan by error in parallelism between the optical axis and the reflecting surfaces of the rotating multi-face mirror.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/732,393Filed 14 Oct 1976
Priority: JA 50-12404015 Oct 1975
Granted: 18 Oct 1977
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

G06K 7/10831
Further details of bar or optical code scanning devices: arrangement of optical elements, e.g. lenses, mirrors, prisms
B41J 2/471
Using the combination of scanning and modulation of light: using dot sequential main scanning by means of a light deflector, e.g. a rotating…
G02B 26/12
Scanning systems: using multifaceted mirrors
G02B 27/0031
For optical correction, e.g. distorsion, aberration: for scanning purposes