Browse Prior Art Database

Dust Alarm Circuit for Mouse

IP.com Disclosure Number: IPCOM000104563D
Original Publication Date: 1993-May-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Itoh, K: AUTHOR [+3]

Abstract

Disclosed is a dust sense/alarm circuit for mouse. The mouse is made up of three components; switches, a ball and encoders/sensors. Fig. 1A shows the ball, X and Y encoders. These encoder rollers contact to the front or rear and side of the ball to detect right/left (Y axes) and forward/backward (X axes) movement. The dust on the encoder roller causes the problem for cursor movement on the screen. The dust interrupts to spin these rollers; therefore, the mouse will not move smoothly and will not be comfortable to use. The operator has to scrape off the dust around roller, but very few people clean these rollers.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 75% of the total text.

Dust Alarm Circuit for Mouse

      Disclosed is a dust sense/alarm circuit for mouse.  The mouse
is made up of three components; switches, a ball and
encoders/sensors.  Fig. 1A shows the ball, X and Y encoders.  These
encoder rollers contact to the front or rear and side of the ball to
detect right/left (Y axes) and forward/backward (X axes) movement.
The dust on the encoder roller causes the problem for cursor movement
on the screen.  The dust interrupts to spin these rollers; therefore,
the mouse will not move smoothly and will not be comfortable to use.
The operator has to scrape off the dust around roller, but very few
people clean these rollers.

      The circuit (Figs. 2A, 2B) can sense the dust on the roller and
give the alarm.  Fig. 1B shows encoder and optical sense unit.  Fig.
2A shows the lighting circuit.  Fig. 3 shows the timing chart of
these circuits.  Light Emitting Diode (LED) illuminate on the encoder
roller.  Light is synchronized with encoder pulse to reduce power
consumption and keep life.

      Photo diode senses reflected light from the roller.  The roller
has to reflect the light from LED, so the color of the roller will be
white or a light color.  If dust is stuck on the encoder roller, the
illumination on the photo diode will decrease.  Increases in dust
will result in increases in VO which is the output of the amplifier.
When the VO rises just above the reference voltage (Vref), output
quickly switches to the high voltage...