US 2010/0060967 A1 · LIGHT SCANNING UNIT, IMAGE FORMING APPARATUS HAVING THE SAME, AND SYNCHRONIZING SIGNAL CALIBRATING METHOD OF THE LIGHT SCANNING UNIT

Abstract

A light scanning unit includes: a light source; a beam deflector to form forward direction and reverse direction scanning lines on an image section and first and second non-image sections respectively disposed at opposite sides of the image section; a reflecting member to reflect the light beam input from the beam deflector; a light detector to receive a first light beam directly input from the beam deflector and a second light beam input via the reflecting member; a control unit to determine whether the scanning line is a forward direction scanning line or a reverse direction scanning line based on signals respectively corresponding to the first and second light beams detected in the light detector, and to control the light source so that a light beam including image information corresponding to a scanning direction of the scanning line can be emitted; and a synchronization adjusting unit to correct an alignment error between the forward direction scanning line and the reverse direction scanning line due to at least one of respective disposition tolerances of the light detector and the reflecting member and a resonance frequency change of the beam deflector correlating to a surrounding environment change.

Claims37

Dependent claims

A light scanning unit, comprising:

a light source to emit a light beam;
a beam deflector to deflect the light beam emitted from the light source, and form forward direction and reverse direction scanning lines on an image section and first and second non-image sections respectively disposed at opposite sides of the image section;
a reflecting member, disposed at the second non-image section, to reflect the light beam input from the beam deflector;
a light detector, disposed at the first non-image section, to receive a first light beam directly input from the beam deflector and a second light beam input via the reflecting member;
a control unit to determine whether the scanning line is a forward direction scanning line or a reverse direction scanning line based on signals respectively corresponding to the first and second light beams detected in the light detector, and to control the light source so that a light beam comprising image information corresponding to a scanning direction of the scanning line can be emitted;
and
a synchronization adjusting unit to correct an alignment error between the forward direction scanning line and the reverse direction scanning line due to at least one of respective disposition tolerances of the light detector and the reflecting member and a resonance frequency change of the beam deflector correlating to a surrounding environment change.

4 more elements

A light scanning unit, comprising:

a light source which emits a light beam;
a beam deflector to deflect the light beam emitted from the light source, and form forward direction and reverse direction scanning lines on an image section and first and second non-image sections respectively disposed at the opposite sides of the image section;
a first light detector, disposed at the first non-image section, to receive the light beam input from the beam deflector;
a second light detector, disposed at the second non-image section, to receive the light beam input from the beam deflector;
a control unit to determine whether the scanning line is a forward direction scanning line or a reverse direction scanning line based on signals respectively detected in the first and second light detectors and to control the light source so that a light beam comprising image information corresponding to a scanning direction of the scanning line can be emitted;
and
a synchronization adjusting unit to correct an alignment error between the forward direction scanning line and the reverse direction scanning line due to at least one of respective disposition tolerances of the first and second light detectors and a resonance frequency change of the beam deflector correlating to a surrounding environment change.

4 more elements

A synchronizing signal calibrating method of a light scanning unit having a beam deflector forming forward direction scanning lines and reverse direction scanning lines on an image section and first and second non-image sections respectively disposed at opposite sides of the image section, a reflecting member reflecting a light beam input from the beam deflector, and a light detector receiving a first light beam directly input from the beam deflector and a second light beam input via the reflecting member, the synchronizing signal calibrating method of the light scanning unit comprising:

calculating a relationship between a normal driving condition and an actual driving condition of the beam deflector;
and
correcting an alignment error based on the calculated driving conditions of the beam deflector.

A synchronizing signal calibrating method of a light scanning unit having a beam deflector forming forward direction scanning lines and reverse direction scanning lines on an image section and first and second non-image sections respectively disposed at opposite sides of the image section, and first and second light detectors respectively provided to the first and second non-image sections and receiving a light beam directly input from the beam deflector, the synchronizing signal calibrating method of the light scanning unit comprising:

calculating a relationship between a normal driving condition and an actual driving condition of the beam deflector;
and
correcting an alignment error based on the calculated driving conditions of the beam deflector.

Dependencies are inferred from the claim text.

Light scanning unit, image forming apparatus having the same, and synchronizing signal calibrating method of the light scanning unit

Life of this patent

Light scanning unit, image forming apparatus having the same, and synchronizing signal calibrating method of the light scanning unit

Life of this patent

Abstract

Claims37