US 12,168,363 B2
Digital pen cap
Nayan Bhatt, Surat (IN); Alekhya Kosaraju, Milton (CA); and Cindralla George, Adimali (IN)
Assigned to ANALOG DEVICES INTERNATIONAL UNLIMITED COMPANY, Limerick (IE)
Filed by Analog Devices International Unlimited Company, Limerick (IE)
Filed on Jun. 28, 2023, as Appl. No. 18/343,115.
Claims priority of provisional application 63/357,807, filed on Jul. 1, 2022.
Prior Publication US 2024/0001706 A1, Jan. 4, 2024
Int. Cl. B43K 23/12 (2006.01); B43K 29/08 (2006.01); G06F 3/0346 (2013.01); G06F 3/0354 (2013.01); G06N 20/10 (2019.01)
CPC B43K 23/12 (2013.01) [B43K 29/08 (2013.01); G06F 3/0346 (2013.01); G06F 3/03545 (2013.01); G06N 20/10 (2019.01)] 19 Claims
OG exemplary drawing
 
1. A cap for positioning on a shaft to record movements of the shaft, comprising:
a housing configured to be attached to a distal end of the shaft opposite a writing end of the shaft;
a plurality of sensors configured to measure position and orientation of the distal end of the shaft and output the position and orientation as sensor data;
a controller configured to process the sensor data and output processed data;
a memory configured to store the processed data;
a transmitter configured to transmit the processed data; and
a machine learning module configured to:
receive the processed data;
extract features from the processed data; and
classify the features into a character based on a trained classification model,
wherein to classify the features into a character, the machine learning module is configured to:
perform primary classification based on submovement analysis that finds Gaussian curves and breaks each curve into submovements; and
perform secondary classification that classifies the submovements into characters based on specific values of the extracted features.