News Column

Researchers Submit Patent Application, "Controlling Pcb Glass Fiber Orientation to Limit Crosstalk in a Sensor Module", for Approval

July 3, 2014



By a News Reporter-Staff News Editor at Politics & Government Week -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventor Ruh, Richard (Monte Sereno, CA), filed on December 12, 2012, was made available online on June 19, 2014.

The patent's assignee is Apple Inc.

News editors obtained the following quote from the background information supplied by the inventors: "Portable handheld electronic devices, such as the iPhone multifunction device by Apple Inc., have a touch screen in their front face, where an earpiece speaker or receiver used for telephony is located. When the device is being held against the user's ear during a phone call, a proximity function automatically senses this condition using an infrared proximity sensor that is built into the device, and on that basis turns off the touch sensitive display screen of the device. The proximity function can also automatically determine or measure when the device has moved away from the user's ear, in which case the touch screen is re-activated. This is achieved by measuring the signals of the infrared proximity sensor's emitter and complementary detector, where the emitter transmits an infrared signal that is reflected by a nearby object (e.g., the user's head) and picked up by the detector. A stronger received signal may be interpreted by the proximity function to mean that the object is closer, while a weaker received signal means the object is farther away. Since an intensity of the infrared signals are used to determine the proximity of an object, optical crosstalk between the emitter and detector components can result in a false signal, and in turn an inaccurate proximity measurement. In some proximity sensor modules, a wall which serves as a light barrier is placed between the emitter and detector. In some cases, however, crosstalk may still occur through the wall."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventor's summary information for this patent application: "An embodiment of the invention is directed to a proximity sensing device including a light emitting assembly having a light emitting device for proximity sensing positioned on a substrate and a light emitting lens positioned along a side of the light emitting device that is opposite the substrate, the light emitting lens capable of transmitting or directing light from the light emitting device to an ambient environment. The proximity sensing device further including a light receiving assembly having a light receiving device positioned on the substrate and a receiving lens positioned along a side of the light receiving device that is opposite the substrate, the light receiving lens capable of collecting light from the ambient environment and transmitting the light toward the light receiving device. A mid wall may be positioned between the light emitting assembly and the light receiving assembly. The mid wall may include a crosstalk controlling portion positioned between the light emitting lens and the light receiving lens. The crosstalk controlling portion may include a plurality of lengthwise fibers and a plurality of crosswise fibers oriented substantially orthogonal with respect to one another and at a substantially non-orthogonal angle with respect to a lateral axis bisecting the light emitting lens and the light receiving lens so as to reduce optical crosstalk between the light emitting assembly and the light receiving assembly.

"In still further embodiments, the substrate may include a material having a plurality of lengthwise fibers and a plurality of crosswise fibers. The fibers of the substrate may be oriented in substantially the same direction as the fibers of the crosstalk controlling portion such that a coefficient of thermal expansion of the substrate and the crosstalk controlling portion are substantially the same. Representatively, in one embodiment, the substrate and the crosstalk controlling portion are made of an FR4 grade glass-reinforced epoxy laminate.

"In still further embodiments, the crosswise fibers may have a greater radius of curvature than the lengthwise fibers or vice versa; one or both may be oriented substantially in a direction of the light emitting lens and the light receiving lens. The radius of curvature of the fibers oriented toward the light emitting lens and the light receiving lens may have a radius of curvature sufficient to cause light to leak out of the fibers so as to reduce transmission or leakage of the light between the light emitting lens and the light receiving lens.

"The above summary does not include an exhaustive list of all aspects of the present invention. It is contemplated that the invention includes all systems and methods that can be practiced from all suitable combinations of the various aspects summarized above, as well as those disclosed in the Detailed Description below and particularly pointed out in the claims filed with the application. Such combinations have particular advantages not specifically recited in the above summary.

BRIEF DESCRIPTION OF THE DRAWINGS

"The embodiments are illustrated by way of example and not by way of limitation in the figures of the accompanying drawings in which like references indicate similar elements. It should be noted that references to 'an' or 'one' embodiment in this disclosure are not necessarily to the same embodiment, and they mean at least one.

"FIG. 1A is a cross-sectional side view of one embodiment of a sensing device.

"FIG. 1B is a top view of the sensing device of FIG. 1A.

"FIG. 1C is a perspective view of certain aspects of the sensing device of FIG. 1A.

"FIG. 1D is a perspective view of certain aspects of the sensing device of FIG. 1A.

"FIG. 1E is a perspective view of certain aspects of the sensing device of FIG. 1A.

"FIG. 2A is a perspective magnified view of an aspect of a lens support member of a sensing device.

"FIG. 2B is a perspective magnified view of an aspect of the lens support member of FIG. 2A.

"FIG. 2C is a perspective view of an aspect of the lens support member of FIG. 2A.

"FIG. 3 is a perspective view of a handheld device within which embodiments of a sensing device may be implemented.

"FIG. 4 is a block diagram of a system in which embodiments of a sensing device may be implemented."

For additional information on this patent application, see: Ruh, Richard. Controlling Pcb Glass Fiber Orientation to Limit Crosstalk in a Sensor Module. Filed December 12, 2012 and posted June 19, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=6361&p=128&f=G&l=50&d=PG01&S1=20140612.PD.&OS=PD/20140612&RS=PD/20140612

Keywords for this news article include: Apple Inc.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


For more stories covering the world of technology, please see HispanicBusiness' Tech Channel



Source: Politics & Government Week


Story Tools






HispanicBusiness.com Facebook Linkedin Twitter RSS Feed Email Alerts & Newsletters