ULTRA THIN OPTICAL POINTING DEVICE AND PERSONAL PORTABLE DEVICE HAVING THE SAME

摘要

An optical pointing device including a Printed Circuit Board (PCB); an infrared Light Emitting Diode (LED) provided on a side of the PCB; a cover plate for detecting motion of a subject, which is placed in an upper portion of the optical pointing device; an image forming system lens placed below the cover plate and configured to condense a light reflected from the subject; an optical image sensor for receiving a reflected image of the subject and detecting motion of the subject; and an optical coating unit placed on the optical image sensor. The cover plate and the optical coating unit are made of a material capable of passing a wavelength of infrared rays which cannot be perceived by a user's eye. A first cut off wavelength of the cover plate is shorter than a second cut off wavelength of the optical coating unit.