Abstract: The optical pointing device of the present invention includes a light source for emitting light; a mode identifier for outputting an upside-down mode signal when the optical pointing device is used upside-down; an image sensor for receiving reflected light from an object and obtaining image information of the object; a converter for converting the image information into digital image data; a basic motion value calculator for outputting a basic motion value corresponding to a motion of the optical pointing device using the image data; and a motion value converter for receiving the basic motion value and outputting a mirror motion value corresponding to the motion of the object in response to the upside-down mode signal. Thus, the optical pointing device provides the rotation mode, the upside-down mode and the normal mode, so that the optical pointing device is used in various situations and upside-down.

Abstract: An optical position tracking device and a method of testing the same are provided. The device includes: a controller for generating at least one test operation signal in response to a command signal; a test signal generator for generating a test signal during a test operation in response to the test operation signal; a motion calculator for receiving the test signal during the test operation and performing operations in response to the test operation signal to output an output signal; and an output signal analyzer for determining whether the output signal is correct during the test operation in response to the test operation signal to output a result signal. Thus, the complexity of the method of testing the optical position tracking device can be markedly reduced and it is unnecessary to employ a high-performance test apparatus.

Abstract: Provided is an optical navigation device and a method of operating the same.

Abstract: Disclosure is a position tracking sensor of an optical mouse and method of controlling the same. The position tracking sensor comprises an image sensor for receiving light inputted from exterior of the optical mouse to detect an image and outputting image information on the detected image, and a controller for determining whether the optical mouse is spaced apart from a worktable using the image information and turning off a light source when it is determined that the optical mouse is spaced apart from the worktable. Thus, it is possible not only to prevent malfunction of the optical mouse resulting from the image detected by external light when the optical mouse is spaced apart from the worktable, but also to prevent the light source from being unnecessarily turned on and the resulting undesired consumption of electrical power.

Abstract: Disclosed herein is an adaptable charging cradle with a speaker usable with a variety of types of portable communication devices. The charging cradle includes a cradle body having a box-shaped receiving space with a front and an upper end opened, at least one speaker unit mounted to the cradle body for emitting sound, and a replaceable sliding cradle housing having fitting means for fitting a portable communication device in the replaceable sliding cradle housing. The replaceable sliding cradle housing is slidably guided in the receiving space of the cradle body such that the portable communication device fitted in the cradle housing can be held in the cradle body. The charging cradle further comprises a connection member mounted to a predetermined position of the receiving space for charging the portable communication device fitted in the cradle housing and holding the cradle housing.

Abstract: Disclosed herein is an ear wearable type wireless terminal. The ear wearable type wireless terminal includes a first housing extending in a longitudinal direction, a second housing rotatably connected to one end of the first housing so as to extend in the longitudinal direction, a third housing located at one end of the second housing to face a direction perpendicular to the longitudinal direction, and a holder having one end fixed to the first housing at a position adjacent to the other end of the first housing, and the other end subjected to a force causing it to incline toward the third housing, thereby allowing the holder to engage a lower portion of a user's ear. With such a configuration, the wireless terminal can be conveniently worn on the lower portion of the user's ear, which is freely selected based on the user's preference.

Abstract: A paging system includes a site control module for storing paging data and activating a plurality of transmitters simultaneously in response to a transmission approval signal to transmit the stored paging data synchronously. The device includes a paging terminal for encoding paging data to transmit and generating a transmission approval signal upon completion of transmitting the paging data; a plurality of site control modules connected to the paging terminal via a private communication line, for storing the paging data in a memory prepared therein and generating the stored paging data upon receiving the transmission approval signal; and a plurality of transmitters for converting the paging data output from the site control modules into a radio paging signal to transmit; whereby the paging data is transmitted simultaneously in synchronism with the transmission approval signal.