Title:
平坦な導波管を備えた光学的生物測定センサー
Document Type and Number:
Japanese Patent JP2005515813
Kind Code:
A
Abstract:
A biometric sensor comprises a detector array and a planar slab waveguide. Diode laser arrays are arranged to couple light into the planar slab waveguide. A ridge of an individual's fingerprint or palmprint, when in contact with the planar slab waveguide at a point of contact therewith, causes a fraction of the light within the waveguide to become unguided at the point of contact, said fraction being detected by the detector array. The sensor has reduced complexity compared to similar sensors employing fibre-optic faceplates and also provides for removal of noise in fingerprint images formed by the sensor, said noise arising from accumulation of dirt or grease on the sensor.
Inventors:
Swatton Stewart Nathan Ridgeley
Application Number:
JP2003562856A
Publication Date:
June 02, 2005
Filing Date:
January 08, 2003
Export Citation:
Assignee:
QINETIQ LIMITED
International Classes:
A61B5/117; G06K9/00; G06T1/00; (IPC1-7): A61B5/117; G06T1/00
Attorney, Agent or Firm:
Sadao Kumakura
Fumiaki Otsuka
Toshio Imajo
Takaki Nishijima
Fumiaki Otsuka
Toshio Imajo
Takaki Nishijima