Patent application number | Description | Published |
20090283848 | Photodiode Assembly With Improved Electrostatic Discharge Damage Threshold - A photodiode with an improved electrostatic damage threshold is disclosed. A Zener or an avalanche diode is connected in parallel to a photodiode. Both diodes are integrated into the same photodiode housing. The diodes can be mounted on a common header or onto each other. An avalanche photodiode and an avalanche diode can be fabricated on a common semiconductor substrate. A regular p-n diode connected in series, cathode-to-cathode or anode-to-anode, to a Zener diode, forms a protection circuit which, when connected in parallel to a photodiode, provides a smaller electrical capacity increase as compared to a simpler circuit consisting just of a Zener or an avalanche diode. | 11-19-2009 |
20100060987 | Optical Device Exhibiting Color Shift Upon Rotation - An optical device exhibiting a color shift upon rotation is disclosed. The optical device has a textured surface having a relief structure finer than a human eye resolution but large enough not to exhibit diffraction effects. The textured surface is coated with an interference thin film that exhibits a color shift with tilt. A uniform color seen at one angle of rotation changes to another uniform color when the optical device is rotated in its own plane. A method of manufacturing of such an optical device, as well as the use of the optical device as an optical security and authentication element, is also disclosed. | 03-11-2010 |
20130285362 | OPTICAL DEVICE EXHIBITING COLOR SHIFT UPON ROTATION - An optical device exhibiting a color shift upon rotation is disclosed. The optical device has a textured surface having a relief structure finer than a human eye resolution but large enough not to exhibit diffraction effects. The textured surface is coated with an interference thin film that exhibits a color shift with tilt. A uniform color seen at one angle of rotation changes to another uniform color when the optical device is rotated in its own plane. A method of manufacturing of such an optical device, as well as the use of the optical device as an optical security and authentication element, is also disclosed. | 10-31-2013 |