Image scanning apparatus and control method thereof

An image scanning apparatus which scans an image of a document and converts the scanned image into digital data, the image scanning apparatus comprising:

• a plurality of light sources that emit light;
• a light guide unit that diffuses the light emitted by the light sources, wherein the light guide unit comprises a first light guide and a second light guide that is oriented parallel to the first light guide;
• a sensor unit that senses image data from the document by recognizing light reflected from the document by being diffused by the light guide unit;
• and
• a control unit that controls the turning on of the light sources, wherein the control unit alternately turns on or off the light sources such that at least one light source of the plurality of light sources is turned on when at least one other light source of the plurality of light sources is turned off,
• wherein the light sources comprise a first light source and a second light source, and
• wherein the first light source is installed at one end of the first light guide and the second light source is installed at one end of the second light guide, wherein the control unit controls the first light source and the second light source such that a turn-on period of the first light source and a turn-on period of the second light source partially overlap with each other.

A control method of an image scanning apparatus which scans an image of a document and converts the scanned image into digital data, the control method comprising:

• emitting light by turning on a plurality of light sources, wherein the emitted light is diffused by a first light guide and a second light guide that is oriented parallel to the first light guide to evenly diffuse light over the document during a scanning;
• sensing image data from the document by recognizing light reflected from the document by being diffused;
• and
• converting the image data into digital data, wherein the turning on the light sources comprises alternately turning on or off the light sources such that at least one of the light sources of the plurality of light sources is turned on when at least one other light source of the plurality of light sources is turned off to reduce a temperature of heat generated by each of the plurality of light sources;
• wherein the turning on the light sources further comprises controlling a turn-on duty cycle of each of the light sources to reduce a size of a heat dissipation plate required by the image scanning apparatus.

A control method of an image scanning apparatus which scans an image of a document and converts the scanned image into digital data, the control method comprising:

• emitting light by turning on a plurality of light sources, wherein the emitted light is diffused by a first light guide and a second light guide that is oriented parallel to the first light guide;
• sensing image data from the document by recognizing light reflected from the document by being diffused;
• and converting the image data into digital data, wherein the turning on the light sources comprises alternately turning on or off the light sources such that at least one of the light sources of the plurality of light sources is turned on when at least one other light source of the plurality off light sources is turned off,
• wherein the turning on the light sources further comprises controlling the light sources such that turn-on periods of the light sources partially overlap with each another.

A control method of an image scanning apparatus, the control method comprising:

• increasing an intensity of a first source of light, which is diffused by a first light guide, while decreasing an intensity of a second source of light, which is diffused by a second light guide that is oriented parallel to the first light guide to reduce a temperature of heat generated by each of the first source of light and the second source of light;
• controlling a turn-on duty cycle of the first source of light and the second source of light to reduce a size of a heat dissipation plate required by the image scanning apparatus;
• sensing image data from a document by recognizing light reflected from the document by being diffused;
• and converting the image data into digital data,
• wherein the first light guide and the second light guide are movable in a plane parallel to a plane of the image to be scanned to evenly diffuse light over the document during a scanning.

An image scanning apparatus comprising:

• a light guide unit that diffuses the light emitted by a plurality of light sources, wherein the light guide unit comprises a first light guide and a second light guide that is oriented parallel to the first light guide;
• and
• a control unit that controls the turning on of the light sources, wherein the control unit alternately turns on or off the light sources such that at least one light source of the plurality of light sources is turned on when at least one other light source of the plurality of light sources is turned off to reduce a temperature of heat generated by the light sources,
• wherein the light guide unit including the first light guide and the second light guide is movable in a plane parallel to a plane of an image to be scanned to evenly diffuse light over the document during a scanning,
• wherein the turning on the light sources further comprises controlling a turn-on duty cycle of each of the light sources to reduce a size of a heat dissipation plate required by the image scanning apparatus.