Tokyo, Japan ALPS Electric Co., Ltd. has developed the industry's first hinge-mounted position detection switch for miniature mobile devices. The new miniaturized SREF switches, mounted within the hinge, detect the cover position of a folding device.
Compared with other solutions that require space on the motherboard for mounting a media detection switch, and in some cases, an external boss, the SREF series are rotary-type position detection switches that are built into device-cover hinges, and therefore, directly detect cover position angles. Movement of the hinge simultaneously moves the detector's traveling contact, which at a preset angle makes contact with the fixed contact, said the company.
In addition to the development of the new SREF switches, ALPS also designed a new miniature traveling contact using the company's proprietary microfabrication technology. The company says this miniaturization makes it possible to incorporate the sensor directly into the hinges of various mobile devices, saving on valuable board space.
In addition, because the SREF series does not use magnetism, there is no issue of interference with geomagnetic sensors for global positioning systems, as with Hall IC type switches, which are often used in these applications. Plus, the SREF switches only draw current when the contact is made, which reduces power consumption. The maximum resistance load rating is 1 mA, 5 Vdc. Operating life is 150,000 cycles.
With external dimensions of 5 mm (diameter) x 1.9 mm (height) these switches can be customized for various applications by setting the angle of detection, or setting multiple detection angles. Applications include liquid crystal display panels on notebook PCs, digital still and video cameras, PDAs, and portable game devices.
Pricing for samples is $2.00 each with lead times of four to six weeks.
Call (408) 361-6400