Optical scanning technique

A method of scanning in an optical scanning system, the method comprising the steps of:

• scanning light onto an image print region of a photosensitive belt with an optical scanning unit;
• receiving light emitted from the optical scanning unit at an edge of the photosensitive belt, and outputting a pulse signal in response to the received light;
• counting a hold time of the pulse signal output from the photodetector in order to calculate an edge point of the photosensitive belt with a belt position calculator;
• accessing a memory storing data to be applied to a delay time from an end point of the pulse signal to a point in time at which the optical scanning unit starts scanning light onto a start point of the print region of the photosensitive belt corresponding to the edge point of the photosensitive belt output from the belt position calculator, and outputting the delay time;
• counting a time duration corresponding to the delay time information, and outputting a scanning start signal in accordance therewith;
• and
• controlling the optical scanning unit such that the optical scanning unit emits light corresponding to an image signal in synchronism with the scanning start signal.

An optical scanning system, comprising:

• an optical scanning unit for scanning light onto an image print region of a photosensitive belt;
• a photodetector disposed at an edge of the photosensitive belt for receiving light emitted from the optical scanning unit, and for outputting a pulse signal in response to the received light;
• and
• an optical scanning controlling portion for controlling the optical scanning unit such that the optical scanning unit emits light corresponding to an image signal in synchronism with a scanning start signal, the scanning start signal being controlled in accordance with the pulse signal output from the photodetector;
• said optical scanning controlling portion comprising a belt position calculator for counting a hold time of the pulse signal output from the photodetector in order to calculate an edge point of the photosensitive belt.

An optical scanning system, comprising:

• an optical scanning unit for scanning light onto an image print region of a photosensitive belt;
• a photodetector disposed at an edge of the photosensitive belt for receiving light emitted from the optical scanning unit, and for outputting a pulse signal in response to the received light;
• and
• an optical scanning controlling portion for controlling the optical scanning unit such that the optical scanning unit emits light corresponding to an image signal in synchronism with a scanning start signal, the scanning start signal being controlled in accordance with the pulse signal output from the photodetector;
• said optical scanning portion further comprising a memory for storing information about a delay time from an end point of the pulse signal to a point in time at which the optical scanning unit starts scanning light onto a start point of the image print region of the photosensitive belt.

An optical scanning system, comprising:

• an optical scanning unit for scanning light onto an image print region of a photosensitive belt;
• a photodetector disposed at an edge of the photosensitive belt for receiving light emitted from the optical scanning unit, and for outputting a pulse signal in response to the received light;
• and
• an optical scanning controlling portion for controlling the optical scanning unit such that the optical scanning unit emits light corresponding to an image signal in synchronism with a scanning start signal, the scanning start signal being controlled in accordance with the pulse signal output from the photodetector;
• said optical scanning portion further comprising a delay time setting unit for accessing a memory in order to locate delay time information corresponding to the edge point of the photosensitive belt.

An optical scanning system, comprising:

• an optical scanning unit for scanning light onto an image print region of a photosensitive belt;
• a photodetector disposed at an edge of the photosensitive belt for receiving light emitted from the optical scanning unit, and for outputting a pulse signal in response to the received light;
• and
• an optical scanning controlling portion for controlling the optical scanning unit such that the optical scanning unit emits light corresponding to an image signal in synchronism with a scanning start signal, the scanning start signal being controlled in accordance with the pulse signal output from the photodetector;
• said optical scanning portion further comprising a scanning start signal generator for counting a time duration corresponding to delay time information output, and for outputting the scanning start signal in accordance therewith.