14 Jul 2005
The pick of this week's patents including a lens array from mobile phone giant Nokia.
• Title: Brightness preserving laser beam shaper
Applicant: UAB MGF "SVIESOS KONVERSIJA", Lithuania
International application number: WO 2005/059626
Lithuanian firm Sviesos Konversija (more widely known as Light Conversion) has devised a beam shaper to correct asymmetrical light beams from sources such as laser diode bars. According to the inventors, the device employs few optical elements and preserves the brightness of the original source. The set-up, which includes a collimator and a stacked array of optical parts, re-shapes the output by firstly separating and then redistributing different elements of the beam.
• Title: Optical device
Applicant: Cambridge Display Technology (CDT) Limited, UK
International application number: WO 2005/059951
CDT is attempting to patent a method of forming organic light emitting diodes (OLEDs) that suits solution deposition of multiple layers, such as spin-coating or inkjet printing. As the applicants explain, solution deposition is complicated by the tendency of initially cast or deposited layers to dissolve in the solvents of adjoining layers. Typically, this restricts the technique to just a single layer and more complex vacuum processing is employed to complete the device. Here, the firm uses a process of cross-linking to render each deposited OLED layer insoluble through exposure to heat or ultraviolet radiation.
• Title: Imaging device
Applicant: Nokia Corporation, Finland
International application number: WO 2005/057922
Mobile phone giant Nokia thinks it has found a way of producing thinner camera phones without sacrificing image resolution. Rather than using a single lens to form an image on the sensor chip, patent application WO 2005/057922 describes an arrangement of four, reduced focal length lenses. Each lens generates its own image, which is stored on a separate part of the camera's detector. An on-board processor digitally recombines the separate images into a single photograph and compensates for any parallax error arising from the spacing of the lens array.