{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9653121","patent":{"patent_number":"US-9653121","title":"Heat-assisted magnetic recording device capable of detecting head malfunction based on different currents of sensors","assignee":null,"inventors":[],"filing_date":"2016-03-18T00:00:00.000Z","publication_date":"2017-05-16T00:00:00.000Z","cpc_codes":["G11B","G11B","G11B","G11B","G11B","G11B","G11B","G11B","G11B","G11B"],"num_claims":20,"abstract":"A method comprises storing a first laser current value in response to a photodetector sensing that a threshold current for a laser diode of a HAMR head has been reached, the photodetector situated proximate the laser diode. The method also comprises storing a second laser current value in response to a sensor sensing that the threshold current for the laser diode has been reached, the sensor situated away from the laser diode. The method further comprises determining a difference (delta) between the first and second laser current values, repeating the storing and determining processes during subsequent use of the laser diode, and detecting a change in the delta indicative of a malfunction of the head."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Heat-assisted magnetic recording device capable of detecting head malfunction based on different currents of sensors","description":"A method comprises storing a first laser current value in response to a photodetector sensing that a threshold current for a laser diode of a HAMR head has been reached, the photodetector situated pro","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9653121","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-9653121","citation_suggestion":"Patentable. \"Heat-assisted magnetic recording device capable of detecting head malfunction based on different currents of sensors\" (US-9653121). https://patentable.app/patents/US-9653121","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9653121","json":"https://patentable.app/api/llm-context/US-9653121","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T04:55:19.715Z"}