[Mitsumi Show] Touch Pad Mounted on Mobile Device's Back

Feb 22, 2008
Mayuko Uno, Nikkei Electronics
The haptic input device. It has 15 conical protrusions and two oblong protrusions on both sides.
The haptic input device. It has 15 conical protrusions and two oblong protrusions on both sides.
[Click to enlarge image]
The mobile device is held with both hands in this photo, but actually the user can operate the cursor with the right hand while holding the device.
The mobile device is held with both hands in this photo, but actually the user can operate the cursor with the right hand while holding the device.
[Click to enlarge image]

Mitsumi Electric Co Ltd developed a haptic input device with protrusions corresponding to icons and buttons on the display screen.

The device is designed to be installed on the back of mobile devices. It is composed of a sheet with small protrusions, a resistance sensitive touch pad and switches. It is on display at the company's technology exhibition "Mitsumi Show 2008," as a reference presentation.

The device is intended for mobile phones with front panels entirely covered with a display screen. The device allows users to perform operations on the screen with one hand while holding the handset, the company said. In the case of using a mobile device with a touch panel, the user has to hold it with one hand and operate the touch panel with the other, although such gadgets may be equipped with a larger screen.

The company is expecting that demands for single-handed operation will increase because the number of gadgets having such a layout is rapidly growing these days.

Although the details of the device have yet to be released, the company made improvements to the sheet so that it can transmit the force to a resistive film just by lightly touching the protrusions. The distance between the horizontally adjacent protrusions is 4mm, while that between the vertically adjacent protrusions is 4.4mm in consideration of operability. The company aims to reduce the thickness of the device to less than 2mm.