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1. (WO1991006029) BEAM POSITION SENSOR FOR A LIGHT BEAM SCANNER
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/006029 International Application No.: PCT/US1990/005635
Publication Date: 02.05.1991 International Filing Date: 05.10.1990
IPC:
G02B 26/10 (2006.01) ,H04N 1/047 (2006.01) ,H04N 1/113 (2006.01) ,H04N 1/12 (2006.01)
G PHYSICS
02
OPTICS
B
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
26
Optical devices or arrangements using movable or deformable optical elements for controlling the intensity, colour, phase, polarisation or direction of light, e.g. switching, gating, modulating
08
for controlling the direction of light
10
Scanning systems
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
N
PICTORIAL COMMUNICATION, e.g. TELEVISION
1
Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
04
Scanning arrangements
047
Detection, control or error compensation of scanning velocity or position
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
N
PICTORIAL COMMUNICATION, e.g. TELEVISION
1
Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
04
Scanning arrangements
113
using oscillating or rotating mirrors
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
N
PICTORIAL COMMUNICATION, e.g. TELEVISION
1
Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
04
Scanning arrangements
12
using the sheet-feed movement as the slow scanning component
Applicants:
EASTMAN KODAK COMPANY [US/US]; 343 State Street Rochester, NY 14650, US
Inventors:
KESSLER, David; US
BALDWIN, Roger, Ernest; US
Agent:
SCHAPER, Donald, D.; 343 State Street Rochester, NY 14650-2201, US
Priority Data:
422,38116.10.1989US
Title (EN) BEAM POSITION SENSOR FOR A LIGHT BEAM SCANNER
(FR) DETECTEUR DE POSITION DE FAISCEAU POUR ANALYSEUR A FAISCEAU DE LUMIERE
Abstract:
(EN) A beam position sensor for a beam scanner is disclosed for use in a laser printer. The printer (10) comprises three diode lasers (14-16) each of which emits at a different wavelength. The beams from the three lasers are combined by the use of dichroic plates (18, 20) to form one combined beam. The combined beam is scanned onto a receiving medium by a polygon (40). The beam position sensor (102) of the present invention is adapted to sense the position of the polygon (40) in order to provide a synchronizing signal which will insure that each raster line in the printer (10) is started at the proper position. The beam position sensor includes a diode laser (120) and optics (122, 124, 126, 128) for projecting a beam from the laser onto the polygon (40). The beam is reflected back from the polygon (40) into a photodetector (132) which effects the start of a new raster line at the appropriate time.
(FR) Détecteur de position de faisceau pour analyseur à faisceau de lumière, utilisé dans une imprimante à laser. L'imprimante (10) comprend trois lasers (14 à 16) à diode, émettant chacun à une longueur d'onde différente. Les faisceaux provenant de trois lasers sont combinés à l'aide de plaques dichroïques (18, 20) afin de former un faisceau combiné. Le faisceau combiné effectue un balayage sur un support récepteur à l'aide d'un polygone (40). Le détecteur (102) de position de faisceau de l'invention est adapté pour détecter la position du polygone (40) afin de produire un signal de synchronisation assurant que chaque ligne de trame dans l'imprimante (10) commence à la position correcte. Le détecteur de position de faisceau comprend un laser (120) à diode ainsi que des éléments optiques (122, 124, 126, 128) permettant de projeter un faisceau provenant du laser, sur le polygone (40). Le faisceau est réfléchi par le polygone (40) jusque sur un photodétecteur (132), lequel déclenche le début d'une nouvelle ligne de trame au moment approprié.
Designated States: JP
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0448669