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02 Jun 2005
The pick of this week's patents including a UV active pharmaceutical ink from Hewlett-Packard.
• Title: Method for the production of an anti-reflecting surface on optical integrated circuits.
Applicant: Infineon Technologies, Germany
International application number: WO 2005/045941
Infineon Technologies, a German maker of semiconductor products, has devised an anti-reflecting coating method to improve light absorption in photodetectors. Suitable for silicon-based sensors and compatible with integated circuits, the technique involves etching the surface of the photodetector to create a pattern of inverse pyramid structures that are anti-reflecting.
• Title: Optical pick-up apparatus for multi recording/reproducing
Applicant: Samsung Electronics, South Korea
International application number: WO 2005/048251
Engineers at Korean electronics giant Samsung have come up with an optical pickup apparatus for reading and writing data across different optical disc (DVD/CD) recording formats. As described in patent application WO 2005/048251, the device includes a dual wavelength laser diode, a photodetector and a hologram module for splitting light into five beams. To make the optical pickup cross-compatible, each of the device's five beams is designed to suit a specific data format. The unit's simple optical structure is said to benefit mass production and also help signal recognition when operating at high temperature.
• Title: A system and a method for an edible, optically invisible ink
Applicant: Hewlett-Packard Development Company, US
International application number: WO 2005/047404
Hewlett Packard is attempting to patent an invisible ink for use on pills or capsules. The authors of patent application WO 2005/047404 believe that the ink, which is only visible when exposed to ultraviolet light, could reduce counterfeit production and fraudulent dispensing of pharmaceuticals. The edible ink is applied using a jet process which helps to protect the pharmaceutical product from any physical or chemical damage.
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