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Wireless mouse
| Details |
Inventors: Junod, Philippe; Joss, Berni; Sasselli, Nicolas; Sommer, Rene; Bussien, Aldo;
Assignee: Logitech, Inc. (Fremont, CA)
Primary Examiner: Brier; Jeffery
Assistant Examiner:
Attorney, Agent or Firm: Fenwick & West LLP
The present invention provides a wireless radio frequency ("RF") communications interface between peripherals and the host personal computer or workstation. In one embodiment, the present invention provides a wireless electronic mouse which uses an RF transmitter to transmit information unidirectionally to a receiver which is coupled to a host computer. This arrangement eliminates the need for a cable connection between the mouse and the receiver, while at the same time permitting continuous communication therebetween. The present invention also provides a method and apparatus to allow the receiver to differentiate between multiple RF wireless mice operating within the same transmission zone by a combination of providing a unique identification code to each transmitting mouse and allowing the user to choose from a plurality of transmission channels. The receiver then automatically switches to the channel selected by the user. The present invention can further receive transmissions from either one or two peripheral devices. In one device mode, the receiver filters out stray frequencies from other RF peripherals. In two device mode, the receiver has the ability to receive information from two RF peripherals, while filtering out other stray RF peripherals operating in the same transmission zone. This allows a user to use the same receiver for one peripheral, such as a mouse, for detailed work and another peripheral for other types of special applications, such as a pointing device for software presentations. The present invention further provides for a power consumption minimization method in the wireless peripheral. |
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DETAILED DESCRIPTION OF THE INVENTION This application is a continuation-in-part of U.
S.
patent application Ser.
No.
08/176,324 filed on Jan.
3, 1994 for a Wireless Mouse, incorporated herein by reference.
Referring first to FIG.
1, the wireless operation of the present invention can be better appreciated.
A peripheral 10, such as an electronic mouse or other suitable peripheral, communicates with a host adapter 20 by means of radio frequency ("RF") signals.
The other suitable peripherals include trackballs, keyboards, digitizing tablets and pointing devices used in software presentations.
The mouse 10 communicates with the host adapter 20 on a suitable carrier frequency such as the range of frequencies around 27 MHz, although one skilled in the art will appreciate that many other RF carrier frequencies would be suitable for use with wireless peripherals according to the present invention.
The host adapter 20 is connected to a host system 30 (not shown), such as a personal computer or work station, through any suitable protocol.
For example, the host adapter 20 may be connected to the host system 30 through a serial port (RS-232) or a mouse port, generally referred to as a PS/2 port.
Referring next to FIG.
2, the major components of the wireless mouse 10 of the present invention may be better appreciated.
The lower housing 100 serves as a platform, onto which the printed circuit ("PC") board 110 is located by means of locating pins 120.
Integral with the lower housing 100 is a ball cage 130, such as is described in U.
S.
patent application Ser.
No.
08/183,897, entitled Integrated Ball Cage for Pointing Device and filed Jan.
21, 1994, incorporated herein by reference.
Also integral with the lower housing 100 is a battery holder 140, discussed in greater detail hereinafter.
Coupled to the front portion of the PC board 110, are a plurality of switches 150A-C for user actuation in a conventional manner.
A loop antenna 160 for transmitting information to the host adapter 20 is printed onto the PC board 110 and is virtually hidden from view
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