Capacitance sensor
AssigneeHewlett-Packard Development Company, L.P.
InventorsDan Rothenbuhler, Hao-Hua Zhu, Dean Richtsmeier
Life of this patent
Estimating the term…
Abstract
A device (100) includes a sensor (101) to determine a capacitance between a first metal piece (209, 309, 409, 509, 609, 709, 809, 909) coupled to a paper tray (213, 413, 513, 913) of a printing device (206, 306) and a second metal piece (207, 307, 407, 507, 607, 707, 807, 907) coupled to a paper width adjuster (212) of the printing device (206, 306). The device (100) also includes a controlled (102) coupled to the sensor (101) comprising a processor (103) in communication with a memory resource (104) including executable instructions to determine a size of paper in the paper tray (213, 413, 513, 913) based on the determined capacitance.
Claims15
A device, comprising:
- a sensor to determine a capacitance between a first metal piece coupled to a paper tray of a printing device and a second metal piece coupled to a paper width adjuster of the printing device;
- and
- a controller coupled to the sensor and comprising a processor in communication with a memory resource including instructions executable to determine a size of paper in the paper tray based on the determined capacitance.
A device, comprising:
- a sensor to determine a capacitance between a first metal piece coupled to a paper tray of a printing device and a grounded second metal piece coupled to a paper width adjuster of the printing device;
- and
- a controller coupled to the sensor and comprising a processor in communication with a memory resource including instructions executable to:
- determine a size of paper in the paper tray based on the determined capacitance;
- and
- based on the size determination:
- allow a job in response to a determination that the job requested of the printing device can be performed;
- and
- alert a source of the request in response to a determination that a job requested of the printing device cannot be performed.
A device, comprising:
- a first metal piece coupled to a paper tray of a printing device;
- a spring component between the paper tray and the first metal piece;
- a second metal piece coupled to a paper width adjuster of the printing device and located on top of the first metal piece;
- a sensor to detect a capacitance between the first metal piece and the second metal piece;
- and
- a controller coupled to the sensor and comprising a processor in communication with a memory resource including instructions executable to determine a size of paper in the paper tray based on the detected capacitance.
Dependencies are inferred from the claim text.