Methods and systems for ascertaining the roughness of a print media surface

A method of detecting the roughness of a medium surface comprising:

• engaging a medium surface with a surface-engaging member;
• projecting light energy towards a reflective member associated with the surface-engaging member in a manner in which the light energy is reflected by the reflective member;
• receiving light energy that is reflected by the reflective member;
• ascertaining, from the received fight energy, a roughness measurement of the medium surface's roughness;
• and
• using the roughness measurement to adjust one or more printing parameters associated with a printer that is to print upon the medium's surface.

A surface roughness detection device comprising:

• a surface-engaging member configured to physically engage a medium surface and to move in response to variations along the medium surface;
• an electromagnetic radiation emitting device configured to direct electromagnetic radiation towards the surface-engaging member;
• a sensor configured to receive electromagnetic radiation reflected from the surface-engaging member, wherein the sensor is sufficiently sensitive so as to detect movement of the reflected electromagnetic radiation that occurs in response to movement of the surface-engaging member as a result of variations along the medium surface;
• and
• a control system configured to modulate one or more print parameters based upon the detected movement of the electromagnetic radiation.

A printing device comprising:

• a printer configured to print upon a medium;
• a movable surface-engaging member associated with the printer and configured to physically engage a medium surface to be printed upon by the printer;
• a reflective member joined with the surface-engaging member;
• one or more light sources in operable proximity to the reflective member and configured to project light energy toward the reflective member;
• a position detector mounted in operable proximity to the reflective member and configured to receive light energy that is reflected from the reflective member, the surface-engaging member being configured for displacement by the medium's surface in accordance with variations in the roughness of the surface sufficiently so that light that is reflected by the reflective member and received by the position detector can be utilized to ascertain a measure of the medium surface's roughness, wherein the position detector is sufficiently sensitive and is calibrated to detect movement of light reflected by the reflective member in response to minute displacements of the surface-engaging member as a result of variations in the roughness of the surface;
• and
• a parameter manipulator coupled with the position detector and configured to modulate one or more print parameters in accordance with the measure of the medium surface's roughness, wherein the one or more printing parameters that are adjusted are selected from a group of parameters consisting of;
• fusing time, fusing speed, toner concentration, toner developer voltage, toner transfer device voltage, and photosensitive surface charging device voltage.