Patent ID: 6270013
Filing Date: 2001-08-07
Classification: G06K

Abstract:
An optical scanner comprising a hand-holdable housing including:a scanner head for scanning a record medium;a roller engageable and rotated by said record medium when scanned by said scanner head, said roller including an optically-sensible marking for use in measuring the rotary movement of the roller;an illuminator for illuminating said record medium and roller including said marking thereon;an optical sensor for sensing information on the record medium and said marking on the roller and for producing an output corresponding thereto;a first optical system including a focusing lens for focusing light reflected from said record medium onto said optical sensor; anda second optical system for focusing light reflected from said roller onto said optical sensor,said second optical system including said focusing lens of the first optical system;said second optical system further including a lens-mirror member having:a first face facing said focusing lens for receiving light reflected by said roller;a second face facing said optical sensor for transmitting light exiting from said lens-mirror member to said optical sensor; anda third reflecting face for receiving the incoming light from said first face and for reflecting same through said second face to the optical sensor;at least one of the faces being light-converging to partially focus the received light such as to compensate for a shorter distance between the focal lens and the roller than between the focal lens and the record member.