US 4,908,511 AGranted

Light beam scanning device

AssigneeFuji Photo Film Co., Ltd.

InventorsHiromi Ishikawa, Masaru Noguchi

Life of this patent

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Abstract

A light deflector such as a polygon mirror deflects a synchronizing light beam and a scanning light beam which are applied thereto at different angles. A first focusing optical system is disposed between the light deflector and an object to be scanned by the scanning light beam for focusing the scanning light beam on the object. A synchronizing signal generator including a reference grating plate generates a synchronizing signal from the synchronizing light beam applied to the reference grating plate. A second focusing optical system is disposed between the first focusing optical system and the reference grating plate for focusing the synchronizing light beam applied through the first focusing optical system on the reference grating plate. Image information is read from the object or read on the object based on the synchronizing signal.

Claims7

Dependent claims

A light beam scanning device for scanning an object to read image information therefrom or record image information thereon, comprising:

light source means for generating a synchronizing light beam and a scanning light beam;
a light deflector for deflecting the synchronizing light beam and said scanning light beam;
a first focusing optical system disposed between said light deflector and the object for focusing said scanning light beam on the object;
a synchronizing signal generator including a reference grating plate, for generating a synchronizing signal from the synchronizing light beam applied to said reference grating plate;
a second focusing optical system disposed between said first focusing optical system and said reference grating plate for focusing the synchronizing light beam applied through said first focusing optical system on said reference grating plate;
and
means for reading the image information from or recording the image information on said object based on said synchronizing signal.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/229,876Filed 8 Aug 1988
Priority: JP 62-1988007 Aug 1987
Granted: 13 Mar 1990
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04N 1/1135
Using oscillating or rotating mirrors: for the main-scan only
H04N 1/053
Detection, control or error compensation of scanning velocity or position: in main scanning direction, e.g. synchronisation of line start or…
H04N 1/12
Scanning arrangements , i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing…:…
H04N 2201/0471
Detection of scanning velocity or position: using dedicated detectors