Optical system, an analysis system and a modular unit for an electronic pen

Abstract

A modular unit is designed for an electronic pen. The modular unit comprises a carrier with a receiver for a writing implement, a printed circuit board, a two-dimensional radiation sensor mounted on the printed circuit board, and an imaging unit which defines an image plane. The carrier, the printed circuit board, and the imaging unit are joined together with the imaging unit facing the radiation sensor to locate the image plane at the radiation sensor. A radiation source, such as an LED or a laser diode, may be arranged on the printed circuit board or mounted in a holder on the imaging unit. The imaging unit may be implemented as a boresight unit for controlling the spatial origin of radiation transmitted towards the radiation sensor. The boresight unit may comprise a radiation-transmitting channel, an imaging lens, and a redirecting mirror in the channel.

1 - 50 . (canceled) 
     
     
         51 . An imaging unit for transmitting radiation from an object to a radiation sensor, said imaging unit being designed to control a spatial origin of radiation reaching the radiation sensor, said imaging unit comprising:
 a housing having an internal channel, a radiation entrance end, and a radiation exit end, wherein radiation is transmitted in the internal channel from the radiation entrance end of the housing to the radiation exit end of the housing;   a lens mounted in the internal channel at said radiation entrance end of said housing;   a mirror associated with said housing and configured to redirect radiation within the internal channel such that radiation transmitting through the internal channel is redirected towards the radiation exit end of the housing; and   a holder for receiving a radiation source, said holder being associated with an outer part of the housing.   
     
     
         52 . The imaging unit according to  claim 51 , wherein the holder is integrated with the outer part of the housing. 
     
     
         53 . The imaging unit according to  claim 52 , wherein the holder comprises at least two arms extending from the housing and configured to receive the radiation source there between. 
     
     
         54 . The imaging unit according to  claim 51 , wherein said lens defines an image plane at said radiation exit end. 
     
     
         55 . The imaging unit according to  claim 54 , further comprising at least one pin configured to be inserted into a corresponding hole on a printed circuit board on which a radiation sensor is mounted, the one pin causing the imaging unit to be aligned with the printed circuit board to locate the image plane on the radiation sensor. 
     
     
         56 . The imaging unit according to  claim 51 , wherein said lens defines an image plane at said radiation exit end, and said housing further comprises a barrier included in said internal channel, the barrier configured to screen said image plane from said radiation entrance end. 
     
     
         57 . The imaging unit according to  claim 56 , wherein said housing further comprises at least one radiation trap included between said barrier and said radiation entrance end. 
     
     
         58 . The imaging unit according to  claim 51 , wherein said housing further comprises an aperture stop included in said internal channel. 
     
     
         59 . An imaging unit for transmitting radiation from an object to a radiation sensor, said imaging unit being designed to control a spatial origin of radiation reaching the radiation sensor, said imaging unit including a solid body including a radiation path, said solid body comprising:
 a tubular part having a first end and a second end, and defining the radiation path between the first and second ends of the tubular part such that radiation is transmitted along the radiation path along a longitudinal axis of the tubular part;   a radiation entrance connected to the first end of the tubular part and configured to receive radiation entering said radiation path, said radiation entrance including a lens element;   a base of the solid body having a sensor pocket and a radiation exit; and   the second end of the tubular part including a mirrored portion formed at an angle with respect to the longitudinal axis of the tubular part such that the mirrored portion is configured to redirect radiation, transmitted along the radiation path, towards the radiation exit.   
     
     
         60 . The imaging unit according to  claim 59 , wherein the solid body further comprises:
 an outer part external to the tubular part; and   a holder connected to the outer part and configured to receive a radiation source, wherein the holder is a separate component that is attached to the outer part.   
     
     
         61 . The imaging unit according to  claim 59 , wherein the solid body further comprises:
 an outer part external to the tubular part and associated with a holder configured to receive a radiation source.   
     
     
         62 . The imaging unit according to  claim 60 , wherein the holder comprises at least two arms configured to receive the radiation source there between. 
     
     
         63 . The imaging unit according to  claim 59 , wherein said lens element defines an image plane at said radiation exit. 
     
     
         64 . The imaging unit according to  claim 63 , further comprising at least one pin configured to be inserted into a corresponding hole on a printed circuit board on which a radiation sensor is mounted, the one pin causing the imaging unit to be aligned with the printed circuit board to locate the image plane on the radiation sensor. 
     
     
         65 . The imaging unit according to  claim 59 , wherein said lens element defines an image plane at said radiation exit, and said solid body further comprises a barrier included in said tubular part to screen said image plane from said radiation entrance. 
     
     
         66 . The imaging unit according to  claim 59 , further comprising:
 an aperture stop formed on said radiation entrance.