Home | Demo | Contact  
Knowledge BasesTechnical ServicesDemoContact
  Function-Oriented KB
  Domain-Oriented KB
  Why Multimedia KB?
  Engineering consulting
  Trend Reports
  For Partners
  Knowledge Bases
  Trend Report Example
  Consulting - Case study
  Call Me Back
  Site Map
  Our Services
Building Knowledge Bases
Fill in the "Order Form" to contact our Sales Department
Fill in the "Contact Form" to contact our Marketing Department

Multimedia Knowledge Base Example

<< Back to the List of Technical Solutions
Function-oriented Knowledge Base \ Optical Mouse Cord

Capacitive coupling transmits cursor control signals to computer

Use Play, Pause, Rewind to control the animation of the image.
These controls work for Internet Explorer only. If you use another web browser, right-click the image and select the Play option.
A conventional computer mouse is normally connected to a computer via a connection cord. A problem associated with a corded mouse is that the cord often serves as an undesirable barrier, which is annoying. Also, it can be broken or operate intermittently. Because the cord is a required element, the operational range of the mouse is limited. A method for providing a mouse or other pointing device without a corded connection to a computer is needed.
To transmit a cursor control signal, the use of a capacitive coupling is proposed. The casing of a mouse houses a double-head trigger circuit, which converts square-wave signals from an interior circuit into pulse signals. On the bottom of the mouse, there are several pulse-transmitting electrodes. When the user's hand moves the mouse, the pulse-transmitting electrodes generate pulse signals that contain cursor control information. A mousepad contains a flexible pad and a metal sheet coated with an insulating pad. Each pulse-transmitting electrode has a capacitive coupling with the metal sheet through the insulating pad. Due to this capacitive coupling, the transmitting electrodes induce pulse signals in the metal sheet. The metal sheet outputs these signals through a wire into a demodulating circuit installed in the computer case. The demodulating circuit restores the normal square-wave shape of the cursor control signals. Thus, a capacitive coupling transmits cursor control signals to the computer.
Additional information
The transmitted pulse signals generate a low energy electric field and have a low frequency. Therefore, a high-frequency radio signal is non-existent and will consequently not be generated and interfere with other electrical devices.
US Patent 5828365; Link >>
<< Back to the List of Technical Solutions
Home | Knowledge Bases | Services | Demo | Contact | Order | Directory |Site Map
Web design by EffectiveDesign | Search engine - Intellexer | Custom Web Development by EffectiveSoft