Patent ID: 8781353
Filing Date: 2014-07-15
Classification: G03G

Abstract:
1. A toner sensor module comprising: a first light source emitting a first light; a first light sensor that generates a sensed light signal that is indicative of a sensed light; a frame positioning the first light source to illuminate a target area from a first side of a plane that is normal to the target area so that illuminated portions of any toner particles at the target area direct a reflected a portion of the first light into the first side, and positioning the first light sensor on the first side of the plane to which toner particles at the target area direct the reflected portion of the first light; and a second light source that emits a second light and that directs the second light to illuminate the target area so that portions of the second light reflect from the target area to the first light sensor and a controller causes only one of the first light source and the second light source to illuminate the target area at any given time.