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Reflowable Optical Finger Navigation Module with Integrated Click

IP.com Disclosure Number: IPCOM000191688D
Publication Date: 2010-Jan-11
Document File: 2 page(s) / 111K

Publishing Venue

The IP.com Prior Art Database

Abstract

The mouse dominates desktop computing navigation. By reversing roles, mouse technology can be applied to mobile devices. That is, while on a desktop the mouse is moved relative to a stationary surface, on a mobile device the mouse stays fixed while the finger moves. Since the mouse used a high speed camera, this form of mobile navigation has come to be known as optical finger navigation or OFN.

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Reflowable Optical Finger Navigation Module with Integrated Click

Timothy Orsley

Avago Technologies

The mouse dominates desktop computing navigation.  By reversing roles, mouse technology can be applied to mobile devices.  That is, while on a desktop the mouse is moved relative to a stationary surface, on a mobile device the mouse stays fixed while the finger moves.  Since the mouse used a high speed camera, this form of mobile navigation has come to be known as optical finger navigation or OFN.

Integral to the desktop mouse is the ability to select by clicking.  So too in the mobile space is the click function attractive to select after navigating to the target.  In the ideal world, the OFN module would provide this functionality and do so in a package that could be reflowed onto the main PCB of the mobile device along with other active components.  The face plate of the phone atop a membrane can then customize the look for a unique industrial design.

Such an ideal reflowable OFN module with integrated click can be achieved.  Let’s start by taking a look at a cross-section of an OFN optical engine ...

      

The foundation of the engine is a daughter PCB.  This PCB has pads on its upper side for bonding of both the navigation IC and the LED.  But the underside of the daughter PCB can also have pads.  Such pads on the under...