Method for setting quantity of light of light-emitting element array
CA 2368984 A1 · Owner: Arima, Takahisa · Inventors: Kusuda, Yukihisa; Saitou, Hideaki; Kuroda, Yasunao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for setting the quantity of light by which a specified exposure energy is produced without degrading the luminous efficiency of an array in which light-emitting thyristors having an I-L characteristic that the luminous efficiency decreases in low-current region are arranged is disclosed. To produce a specified exposure energy, the range of the density D of the current flowing through a thyristor is limited by 3 x Dth< D < 100MA/m2 wh ere Dth is the light-emitting threshold current density equivalent to the current density corresponding to the current value determined by the point at which the tangential line of the I-L characteristic curve at the current value …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed January 22, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 22, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 22, 2023.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.