Bagaimana Cara Kerja Scroll Whell Pada Mouse?

Summary

This video explores the technology behind computer mouse scroll wheels, delving into two key types of rotation sensors: optical encoders and magnetic position sensors. The optical encoder uses infrared LED light and optical sensors to detect rotations, while the magnetic sensor utilizes magnetic fields and microchip sensors to track movement. Additionally, the video covers mechanical features, such as the tactile feedback and ‘clicking’ sensation felt when using the scroll wheel. The video also touches on various other methods and designs used to measure wheel rotation, emphasizing the future of technology education.

Takeaways

• 😀 Optical rotary encoders in mouse scroll wheels use an infrared LED and a coding disk to create light pulses that are detected by optical sensors.
• 😀 These pulses are converted into electronic signals to measure the direction and speed of the wheel's rotation.
• 😀 Magnetic position sensors, on the other hand, use magnets and Hall Effect sensors to measure the strength and position of the magnetic field.
• 😀 The two main technologies (optical and magnetic) are both used to measure wheel rotation, but they differ in the way they capture data.
• 😀 Optical encoders measure relative rotation, while magnetic sensors are capable of detecting absolute position, giving a more precise angle measurement.
• 😀 Optical encoders are commonly found in modern mice, with each pulse corresponding to a small movement that helps calculate speed and distance.
• 😀 Magnetic sensors offer more accuracy in measuring the rotation angle, which can be used to determine the exact position of the scroll wheel.
• 😀 Mouse scroll wheels may feature tactile feedback, such as 'clicking' or 'stepping' sensations, which are achieved through mechanical components like plastic followers and bumps.
• 😀 Some mice use alternative designs, including potentiometers or electropermanent magnets, to detect rotation and offer unique user experiences.
• 😀 The scroll wheel mechanism in mice is not only about measuring motion but also plays a crucial role in navigating websites or applications by translating physical movement into digital signals.
• 😀 The video highlights that while optical and magnetic sensors are the most common methods for detecting rotation, other designs and technologies also exist, showing the variety in mouse engineering.

Q & A

What is the main function of a scroll wheel in a computer mouse?

The main function of a scroll wheel in a computer mouse is to allow users to scroll vertically through content on a screen, such as web pages or documents, by detecting rotation and sending this information to the computer.

What technologies are commonly used to measure rotation in a mouse scroll wheel?

Two main technologies are used to measure rotation in a mouse scroll wheel: optical encoders and magnetic encoders. Optical encoders use infrared light and optical sensors, while magnetic encoders rely on magnets and magnetic field sensors.

How does an optical encoder work in a scroll wheel?

An optical encoder works by using an infrared LED light source, a lens, optical sensors, and an encoding disk with 48 evenly spaced patterns. As the wheel rotates, the LED light is blocked by the encoding disk, creating pulses that are detected by the sensors, which are then translated into information about rotation speed and direction.

What is the role of the 48-spoked encoding disk in an optical encoder?

The 48-spoked encoding disk in an optical encoder is crucial for generating pulses. Each time the wheel rotates, the disk blocks the infrared light, creating a pulse for each of the 48 spokes. This pulse data is then used to calculate the rotation speed and direction.

How does a magnetic encoder detect rotation?

A magnetic encoder detects rotation by using two sensors (EH sensors) that measure changes in the magnetic field. The scroll wheel contains a magnet, and as it rotates, the sensors detect the strength and orientation of the magnetic field, allowing the system to calculate the rotation speed, direction, and position.

What is the difference between an optical incremental encoder and an optical absolute encoder?

An optical incremental encoder can only measure relative movement, such as counting pulses per rotation, but it cannot determine the absolute position of the wheel. In contrast, an optical absolute encoder can detect the exact position of the wheel at any given moment, often using a disk with varying patterns to allow for precise angular measurement.

Why do some computer mice provide tactile feedback, such as 'stepping' or 'clicking' while scrolling?

Tactile feedback is created by physical mechanisms inside the mouse that provide resistance or bumps when the scroll wheel is turned. This is often achieved through a plastic follower that moves over a series of bumps or ridges, generating a sensation of steps or clicks as the wheel is rotated.

What is the purpose of the small plastic follower in a scroll wheel with tactile feedback?

The small plastic follower in a scroll wheel with tactile feedback follows a series of raised bumps along the wheel's surface. As the follower moves over these bumps, it creates a sensation of 'steps' or clicks, giving the user feedback about the movement of the wheel and helping them navigate content more precisely.

What is the role of the microchip in the magnetic encoder setup?

The microchip in the magnetic encoder contains two EH sensors positioned perpendicular to each other. These sensors measure the magnetic field changes as the scroll wheel rotates, and the microchip processes this data to determine the direction, speed, and distance of the wheel's rotation.

What other methods can be used to detect rotation in a mouse aside from optical and magnetic encoders?

Other methods to detect rotation in a mouse include using potentiometers (which measure changes in resistance), mechanical designs with buttons attached to the wheel, and magneto-electropermanent systems, where the movement is driven by magnets and gear mechanisms.