Optical mouse working principle

information regarding optical mouse working principle

1. Optical mouse working principle Anas Ibrahim,Moeen Ghafoor GIK institue Dec 12,2014

2. O utline History and literary study Optical mouse. Little glance of optics in ball mouse. General optical and laser mouse comparison. Electronic Components Working principle Light scattering and LED Optical mouse sensor Communication IC Scroll mechanism Click mechanism References 2 GIK institute Anas Ibarhim,Moeen Ghafoor 19-Dec-14

3. History and literary study Optical mouse was invented in 1980. It didn't gained public attention but in 1998 First wander was Sun micro systems.[5] MAX1000 laser mouse entered into market in 2004 by Avogo and Agilient technology. VCSEL technology introduced to reduce size. Dark field laser sensor introduced in 2009 3 GIK institute Anas Ibarhim,Moeen Ghafoor 19-Dec-14

4. Optical mouse It is device which is used to measure the motion and acceleration of pointer. It uses light source instead of ball to judge the motion of the pointer. Optical mouse has sub type called laser mouse but they share same working principle. 4 GIK institute Anas Ibarhim,Moeen Ghafoor 19-Dec-14

5. Little glance of optics in ball mouse Ball mouse also posses led for measuring the revolution. Led light is intercepted by the wheel. Photo detector records interception and send the signal to processor 5 GIK institute Anas Ibarhim,Moeen Ghafoor 19-Dec-14

6. General optical and laser mouse comparison General optical mouse Optical mouse uses red, blue green led. Optical mouse have three buttons. Optical mouse is less sensitive.(units DPI) Sensitive towards surface. Short battery life Laser mouse Laser mouse uses only infrared led. Laser mouse has as many as 12 buttons and can be programmed by user. Highly sensitive. Able to work on any hard surface Low battery life 6 GIK institute Anas Ibarhim,Moeen Ghafoor 19-Dec-14

7. Electronic Components Led source Lens Mounted camera Scroll mechanism Micro switching USB 7 GIK institute Anas Ibarhim,Moeen Ghafoor 19-Dec-14

8. Working principle Light is focused on the lens. It diverged and come to surface after deflection from two palates. Photo detector can is used to pick the change in intensity of light at different position. Signal is processed and is transferred to the computer. 8 GIK institute Anas Ibarhim,Moeen Ghafoor 19-Dec-14 Schematic of reflection[2]

9. Light scattering and LED Lens is used to focus the light. Led is used which emitter the light This can be IR or visible LED 9 GIK institute Anas Ibarhim,Moeen Ghafoor 19-Dec-14 Above lens and led on left Engineering garage.com Engineering garage.com

10. Light scattering and LED(cont’d) Laser of very small power is used. IR laser is used IR laser mouse[2] 10 GIK institute Anas Ibarhim,Moeen Ghafoor 19-Dec-14 Bottom side of laser mouse Engineering garage.com Engineering garage.com

11. Optical mouse sensor IC shown in the figure works on the navigation technology IC above is DSP chip which acquits image and process it. In this way it determines the direction and distance. Photodiode/camera is CMOS sensor uses house lens to capture 1500-6000 images[4]. 11 GIK institute Anas Ibarhim,Moeen Ghafoor 19-Dec-14 Camera embedded chip

12. Communication IC This IC uses I2C protocol for interfacing[2] USB transceiver IC It works as voltage regulator[3] 12 GIK institute Anas Ibarhim,Moeen Ghafoor 19-Dec-14 Communication IC Engineering garage.com

13. Communication IC(cont’d) Communication IC composed of Digital image processing algorithms Can do processing at the rate 18MIPS. Above pattern move to south east on opposite motion of mouse. 13 GIK institute Anas Ibarhim,Moeen Ghafoor 19-Dec-14 DIP schematic Engineering garage.com

14. Scroll mechanism When the wheel is rotated the potentiometer also rotate. Change in the resistance corresponds to the revolutions 14 GIK institute Anas Ibarhim,Moeen Ghafoor 19-Dec-14 Scroll mechanism Engineering garage.com Engineering garage.com

15. Click mechanism Red part is used for clicking purpose. When a button is clicked , a flexible metal plate is pressed which shorts the two points of the circuit that detects the mouse click. 15 GIK institute Anas Ibarhim,Moeen Ghafoor 19-Dec-14 Engineering garage.com Engineering garage.com

16. Conclusion and future New emerging technologies are being utilized in the working mechanism of optical mouse and to make its use easy and comfortable. We can expect its prices and size will be reduced in future for new ways of circuit design. 19-Dec-14 GIK institute Anas Ibarhim,Moeen Ghafoor 16

17. Reference en.wikipedia.org/wiki/Vertical- cavity_surface - emitting_laser explainthatstuff.com/computermouse.html thescienceera.wordpress.com/2014/08/13/optical-mouse-work/ engineersgarage.com/insight/how-optical-mouse- works?page =1-8 engineersgarage.com/contribution/difference-between-optical-mouse-and-laser-mouse 19-Dec-14 GIK institute Anas Ibarhim,Moeen Ghafoor 17

18. Questions 19-Dec-14 GIK institute Anas Ibarhim,Moeen Ghafoor 18