1. Hand-held Stabilized Laser Pointer Patent: 7762684 Date: Jul.27 2010 Inventors: Jeffrey Dale Wilson, Daniel Steven Sanchez OPT 310 2014 Danlu Huang

2. Problems with Prior Arts Blink on and off Pulsed laser beam Use cushion material to avoid high frequency shakes Fixing direction relative to gravity OPT 310 2014 Danlu Huang

3. Goal: Minimize Laser Dot Jitter Caused by Unwanted Hand Tremor Features Design to reduce hand tremor at 4~12 Hz Transmit frequency lower than that (intended motion) No energy cost on stabilization Structure Housing Case Power Source Laser Module (2) Counterweight & Bridge Gimbal Biasing w/ Magnetic field OPT 310 2014 Danlu Huang

4. What’s in there? OPT 310 2014 Danlu Huang

5. How does it balance? Spring damping using magnetic field OPT 310 2014 Danlu Huang