Impeller blade for calibrating light sensor
AssigneeHewlett-Packard Indigo B.V.
InventorGil FISHER
Life of this patent
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Abstract
In some examples, an apparatus can include a light transmitter, a light sensor aligned along a light transmittance axis of the light transmitter, an impeller positioned between the light transmitter and the light sensor. The impeller can in some examples include a blade to pass through the light transmittance axis during rotation of the impeller. The blade can in some examples be translucent to permit calibration of the light sensor based on a comparison of a first light sensor reading when the blade intersects the light transmittance axis and a second light sensor reading when the blade does not intersect the light transmittance axis.
Claims15
An apparatus comprising:
- a light transmitter;
- a light sensor aligned along a light transmittance axis of the light transmitter;
- an impeller positioned between the light transmitter and the light sensor, the impeller including a blade to pass through the light transmittance axis during rotation of the impeller,
- wherein the blade is translucent to permit calibration of the light sensor based on a comparison of a first light sensor reading when the blade intersects the light transmittance axis and a second light sensor reading when the blade does not intersect the light transmittance axis.
An apparatus comprising:
- a first plate including a first surface;
- a second plate including a second surface substantially parallel to the first surface;
- a light transmitter integrated into the first surface;
- a light sensor integrated into the second surface and facing the light transmitter;
- an impeller rotatably mounted between the first surface and the second surface, the impeller including a blade to block, during a first time period, a gap between the light transmitter and the light sensor and to at least partially reveal, during a second time period, the gap between the light transmitter and the light sensor to allow printer fluid between the light transmitter and the light sensor,
- wherein the blade includes a portion that is translucent to permit calibration of the light sensor based on a comparison of a first light sensor reading during the first time period and a second light sensor reading during the second time period.
A system comprising:
- a housing;
- a light sensor secured to the housing, the light sensor to sense light transmitted from a light transmitter;
- an impeller secured to the housing, the impeller including a blade that is rotatably mounted to the housing to allow the blade to pass between the light sensor and the light transmitter for each revolution of the impeller, wherein the blade is to wipe printer fluid from an outer surface of the light sensor and an outer surface of the light transmitter as the blade passes between the light sensor and the light transmitter;
- and
- a processing resource in communication with the light sensor, wherein the processing resource is to determine a calibration setting for the light sensor based on received data from the light sensor corresponding to a first light sensor reading through a translucent portion of the blade and a second light sensor reading not through the blade.
Dependencies are inferred from the claim text.