{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8485826","patent":{"patent_number":"US-8485826","title":"Portable terminal device having function of measuring mental fatigue and its measuring method","assignee":null,"inventors":[],"filing_date":"2009-09-14T00:00:00.000Z","publication_date":"2013-07-16T00:00:00.000Z","cpc_codes":["A61B","A61B","H04M","H04M"],"num_claims":20,"abstract":"A portable terminal device (1) capable of easily evaluating mental fatigue comprises: an operation unit (4); an imaging unit for measuring ambient light (5); a display screen (2) or a light-emitting element (3) for presenting a flashing image or light while a flicker frequency of the flashing source is being monotonically changed from a start frequency to an ending frequency; and a recording unit for, when a user operates the operation unit (4) as the user perceives a flicker, recording the flicker frequency at the time point as a measured frequency, wherein: a first frequency datum, which is the measured frequency measured when the user is in a healthy condition, is associated with a first luminance datum, which is a measured ambient luminance, and the associated datum is stored in the recording unit, a proportion of decrease of a second frequency datum, which is the measured frequency measured when the user is not in a healthy condition, from the first frequency datum recorded in the recording unit and associated with the first luminance datum which has the same or similar order of magnitude to a second luminance datum, which is a measured ambient luminance, is calculated to evaluate a degree of fatigue of the user."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Portable terminal device having function of measuring mental fatigue and its measuring method","description":"A portable terminal device (1) capable of easily evaluating mental fatigue comprises: an operation unit (4); an imaging unit for measuring ambient light (5); a display screen (2) or a light-emitting e","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8485826","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-8485826","citation_suggestion":"Patentable. \"Portable terminal device having function of measuring mental fatigue and its measuring method\" (US-8485826). https://patentable.app/patents/US-8485826","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8485826","json":"https://patentable.app/api/llm-context/US-8485826","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-31T18:57:36.592Z"}