And its the first commercially-available phone family with a wireless induction charger available. Yes, you heard right boys and girls, a wireless charger. This does mean that the Lumia 920 and 820 will eschew the old 2mm chargers most modern Nokias come bundled with (the ones that were super-efficient and quick, mind you) and rely on USB charging if you’ve left your super-sweet wireless one elsewhere.

Both phones will be shown off at a special conference today and I’ll try my best to find wherever the live stream of the conference might be. For now, here’s the Lumia 920 for you to admire.

UPDATE: The Nokia Lumia launch can be streamed from here, make sure you have Silverlight installed. Anandtech is on-site and re-editing their launch article covering the phones, for those of you following this on your phones or with lines too slow for streaming. You can alternatively start the video buffer, let it run for a while and then catch up.

Boasting a 4.5″ screen in the same unibody carbonite shell, the Lumia 920 will be available in a wide range of colours, of which three are pictured here (red! red! red!). The hardware inside is a mystery but I’m expecting a dual-core Krait processor running at 1.5GHz, 1GB of RAM and up to 32GB of storage (once again, mimicking the iPhone’s ridiculous omission of a SD card). Nokia may also debut their Pureview technology on the new phones, but the 8MP camera might be a tiny bit small for that. But, given that Pureview works by oversampling images and then adjusting them for clarity, its actually pretty reasonable if they, for example, decided to stuff in a 16MP sensor but allow for Pureview to enhance the clarity by a factor of 2 in 8MP mode. (Not that they will, but this is educated fanboy pipedreaming we’re talking about here).

But that charging pod is oh-so-cool! If you’re not familiar with it, wireless induction or resonant inductive coupling works by charging and vibrating a copper coil in the base of the charger (the little round hump you see on the charger) and placing another copper coil inside the charging device right on top of it. The transmitting coil generates a magnetic field and the recieving coil picks up the vibrations and the phone’s charging system converts that kinetic energy into stored energy in the battery. Normally, resonant coils don’t generate a very big magnetic field, making them perfect for use in a modern environment where Wi-Fi traffic can be messed with by placing a working magnet on top of the router (has to be a man-made magnet though, always kept charged). These coils radiate to a very small surface area, ensuring they don’t mess with anything else.

Efficiency? Well, lets just say that I had to do some very rough physics calculations of the like I haven’t tackled since high school. Almost 85% of the energy should be captured and thanks to the small size of the coil, magnetic waves shouldn’t leak out very far. We already use this technology to some degree with NFC for information exchange, so the next logical step was energy transfer. It won’t charge your phone from scratch and it won’t be as fast as 12v USB or 2mm adapters, but it will allow you to keep the phone topped up at all times.

Still, how cool is that? And since you can work out the coil’s frequency and even build your own one, it’ll be interesting to see what third-party manufacturers can come up with.


Source: Tom’s Hardware

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