Optical reading document board, image reading apparatus and image forming apparatus including the image reading apparatus

An image forming apparatus comprising:

• an image reading apparatus comprising:
• an optical reading document board comprising a platen formed of transparent glass and having a top surface on which a document is placed, and a reflectance reduction layer coated on a bottom surface of the platen, wherein the reflectance reduction layer comprises one or more first layers and one or more second layers alternately stacked in multiple layers, wherein the first layer has a refractive index that is less than a refractive index of the platen, and the second layer has a refractive index that is greater than the refractive index of the platen, and
• an image sensor disposed below the optical reading document board and having a light emitting unit to irradiate light toward the document, wherein an image of the document is read by receiving, by the image sensor, light reflected from the document;
• and
• a printing unit to print the image of the document read by the image reading apparatus.

An optical reading document board usable with an image forming apparatus, comprising:

• a transparent platen disposed to pass a light beam to read a document;
• and
• a reflectance reduction layer disposed on the platen to transmit the light beam in a direction toward the platen and the document, and to transmit a reflected light beam from the document through the platen in a second direction, the reflectance reduction layer having a characteristic different from a characteristic of the platen to reduce reflectance of the reflected light beam which is reflected back to the platen,
• wherein the transparent platen comprises a first surface to face the reflectance reduction layer and a second surface to face the document;
• the first direction is a direction from the first surface to the second surface;
• the second direction is a direction from the second surface to the first surface;
• and
• the reflectance reduction layer reduces the reflectance of the reflected beam received through the second direction such that the reflected beam is transmitted in the second direction and is prevented from being reflected and transmitted in the first direction.