Compact imaging lens assembly for an imaging-based bar code reader

摘要

An imaging lens assembly ( 30 ) for a camera assembly ( 20 ) of an imaging-based bar code reader ( 10 ) for focusing an image ( 100 ') of a target object ( 100 ) within a field of view (FV) of the camera assembly ( 20 ) onto a sensor array ( 28 ) of the camera assembly ( 20 ). The imaging lens assembly includes a front aperture stop ( 31 ) facing the field of view (FV), the aperture stop ( 31 ) including an aperture ( 31 a) through which light from the field of view (FV) passes. The imaging lens assembly ( 30 ) further including a three lens system ( 36 ) disposed rearward of the front aperture stop ( 31 ) and a meniscus lens ( 35 ) disposed rearward of the three lens system ( 36 ). The three lens system ( 36 ) and the meniscus lens ( 35 ) receiving light passing through the aperture ( 31 a) and focusing the light onto the sensor array ( 28 ).