Saturday 4 August 2012


Laser Keyboard and Mouse Reviews


The laser keyboard and mouse are the ultimate technology when it comes to computer science. The wireless laser keyboard and mouse are virtual parts of peripheral hardware that can be projected and touched on any type of surfaces. This type of keyboard is also called projection keyboard. This technology is able to record the finger movements and translate them into keystrokes in the device, although there are no physical keys. The first virtual keyboard was invented by IBM in 1992.
The laser keyboard projection is sort of an image of a real keyboard but which does not really exist physically. Most systems may be used as a virtual mouse or virtual piano.
This is how these devices work: the visible virtual keyboard is projected onto the surface by a laser or with some systems, by a beamer. The projecting device is equipped with a sensor or sensorial camera that picks up the finger movements and touches and when these are detected, they are transformed into actions or characters.
Some systems use an invisible infrared as a second beam to create a wireless laser keyboard projection. This type of product projects an invisible infrared beam above the virtual keyboard on which one uses the fingers to make keystrokes on the projected keyboard. The beam is equipped with sensors and cameras that translate the place when the infrared light was broken into characters or actions.
Laser Keyboard and Mouse Reviews
The virtual keyboard and mouse is the only computer peripheral part that works in complete darkness and it is suitable for Blackberries, Smartphones, PDAs, and Mac & Tablet PCs. The device projecting the keyboard comes in different sizes but they are normally the size of a small mobile phone, 90 x 34 x 24 mm. They have the advantage that users can write texts or e-mails easier and faster, just as with a usual keyboard and that when it is turned off it disappears completely.
The projection keyboard may be used on PDA’s, MAC compatible laptops, Tablet PCs, industrial environments, mobile phones, clean rooms, test equipment or in sterile and medical environments.
The market provides all types of accessories for virtual keyboards. One can get a portable charger for reasonable costs and extra batteries. There are also converter cables available for those whose devices are not equipped with serial ports. The Bluetooth Dongle is a new technology that allows users to connect their virtual keyboards with other devices such as PC’s or mobile phones. Those who travel around the world may purchase an international adapter plugs set to make sure they may use their keyboard in any country in the world.
The prices of the projection keyboards vary depending on the type of technology used, if there are accessories included and by manufacturer. The costs range from a little over $100 and can reach $200 or even more.
The recent IT technology made it possible that such devices exist. The laser keyboard and mouse are perfect for those who have trouble typing texts on their mobile phones or PAD’s or for those who would need such a device in a more special environment such as sterile and medical places.


Projection keyboard

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A projection keyboard
A projection keyboard is a form of computer input device whereby the image of a virtual keyboard is projected onto a surface: when a user's fingers are placed on the projected "keys", the device translates them into keystrokes.

Contents

History

An optical virtual keyboard[1] was invented and patented by IBM engineers in 1992. It optically detects and analyses human hand and finger motions and interprets them as operations on a physically non-existent input device like a surface having painted or projected keys. In that way it can emulate unlimited types of manually operated input devices (such as a mouse, keyboard, and other devices). All mechanical input units can be replaced by such virtual devices, optimized for the current application and for the user's physiology maintaining speed, simplicity and unambiguity of manual data input.
In 2002, the start-up company Canesta developed a projection keyboard using their proprietary "electronic perception technology".[2][3][4] The company subsequently licensed the technology to Celluon of Korea.[5]
A proposed system called the P-ISM will combine the technology with a small video projector to create a portable computer the size of a fountain pen.[6]

Design


A laser projection keyboard used with a tablet.
A projection keyboard generally works by:
  1. A laser or beamer projects visible virtual keyboard onto level surface
  2. A sensor or camera in the projector picks up finger movements[1]
  3. detected co-ordinates determine actions or characters to be generated
Some devices use a second (invisible infrared) beam:
  1. An invisible infrared beam is projected above the virtual keyboard
  2. Finger makes keystroke on virtual keyboard. This breaks infrared beam and infrared light is reflected back to projector
  3. Reflected infrared beam passes through infrared filter to camera
  4. Camera photographs angle of incoming infrared light
  5. Sensor chip determines where infrared beam was broken
  6. detected coordinates determine actions or characters to be generated
The laser keyboards use laser and infra-red technology to create the virtual keyboard and to project the hologram of a keyboard on a flat surface.
The projection is realized in four main steps and via three modules: projection module, sensor module and illumination module. The main devices and technologies used to project the hologram are a diffractive optical element, red laser diode, CMOS camera and sensor chip and an infrared (IR) laser diode.
Template projection (Projection module)
A template produced by a specially designed and highly efficient holographic element with a red diode laser is projected onto the adjacent interface surface. [7] The template is not however involved in the detection process and it is only used as a reference for the user. In a fixed environment, the template can just as easily be printed onto the interface surface.
Reference plane illumination (Micro-illumination ModuleTM)
An infra-red plane of light is generated on the interface surface. The plane is however situated just above and parallel to the surface. The light is invisible to the user and hovers a few millimeters above the surface. When a key position is touched on the surface interface, the light is reflected from the infra-red plane in the vicinity of the key and directed towards the sensor module.
Map reflection coordinates (Sensor Module)
The reflected light user interactions with the interface surface is passed through an infra-red filter and imaged on to a CMOS image sensor in the sensor module. The sensor chip has a custom hardware embedded such as the Virtual Interface Processing CoreTM and it is capable of making a real-time determination of the location from where the light was reflected. The processing core may track not only one, but multiple light reflections at the same time and it can support multiple keystrokes and overlapping cursor control inputs.
Interpretation and communication (Sensor module)
The micro-controller in the sensor module receives the positional information corresponding to the light flashes from the sensor processing core, interprets the events and then communicates them through the appropriate interface to external devices. By events it is understood any key stroke, mouse or touchpad control.
Most projection keyboards use a red diode laser as a light source and may project a full size QWERTY layout keyboard. The project keyboard size is usually 295 mm x 95 mm and it is projected at a distance of 60 mm from the virtual keyboard unit. The projection keyboard may detect up to 400 characters per minute and it may be connected by using either USB ports or Bluetooth.
The projection keyboard unit works on lithium-ion batteries and it has a capacity of at least 120 minutes of continuous typing. The projection unit sizes vary on the manufacturer but normally it is not bigger than 35 mm x 92 mm x 25 mm.

Connectivity

Projection keyboards connect to the devices they are used for either through Bluetooth or USB.
The Bluetooth projection keyboard is a wireless virtual keyboard, a pocket-size device that projects a full-size keyboard through infrared technology onto any flat surface.[8]
Bluetooth dongle technology enables the projection keyboard for point to multi-point friendly connectivity with other Bluetooth devices, such as PCs, PDAs and mobile phone. Bluetooth is an open specification for wireless data transmission which operates on the globally available 2.4GHz radio frequency.[9]
The way the Bluetooth projection keyboard is connected to a device varies depending on the specific laptop, phone or computer that the user intends to use it for. All the connectivity instructions normally come with the product and they basically consist in turning on the Bluetooth connection on one's device and then turning on the keyboard.
The USB projection keyboard works like a regular USB keyboard. The connection between the virtual keyboard and the device is made through a USB port, which is available on every computer, laptop and other devices that are compatible with the projection keyboard. Connection instructions come as well with the product and with the manufacturer's specifications but it mainly consists in Plug and Play the devices.

Uses

Most systems can also function as a virtual mouse or even as a virtual piano.[10]

References

Laser Keyboards - How the Projection Technology Works

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