Optoelectron mouse

Definition

The optical mouse is used to replace the ball. Such sensors need to be specially made, with a striped or point-like pattern.

The optical mouse is determined by the optical disconnector, and the most significant feature is that a special reflector is used as a pad when MOUSE moves. The main

characteristics of this pad is the fine black white phase. The reason is that at the bottom of the photovoltaic mouse, there is a light-emitted diode and two mutually perpendicular photosensitive tubes. When the illuminated diode is irradiated to the white point and the black point, it will generate refraction and not refraction in two states, and the photosensitive tube is The corresponding signal will be generated after the two states are processed. Thereby the computer reacts, once the pad is left, the optical mouse cannot be used.

The working principle of the optical mouse is: there is a light-emitting diode inside the optical mouse, and the light of the light-emitting diode is shown, and the bottom surface of the shine is shining (this is why the bottom of the mouse will always illuminate). A portion of the light reflected back in the bottom surface of the light mouse is then transmitted to an optical sensing device (micromatograph) imaging. Thus, when the optical mouse moves, the moving trajectory is recorded as a set of high-speed shooting. Finally, a series of images taken by the optical mouse inside the moving track is analyzed to analyze the series of images taken on the mobile trajectory, and the mouse is judged by analyzing the change in the characteristic point position on these images. Move direction and mobile distance to complete the positioning of the cursor. Optical mouse is usually composed of the following portions: optical sensors, optical lenses, light emitting diodes, interface microprocessors, tight buttons, rollers, connectors, PS / 2 or USB interfaces, housings, and the like. The following is given the introduction

optical sensor

optical sensor is the core of the optical mouse, and the manufacturer of optical inductors can produce only Agilent, Microsoft and Logitech. Among them, Agilent's optical sensor is widely used. In addition to Microsoft's total and Logitech's partial photoelectric mouse, other optical muds have basically adopted an Optical inductor of Agilent.

Control chip

control chip is responsible for coordinating the work of each element in the optical mouse, communicating with external circuits (bridging) and the transmission and charge of various signals. We can understand it as "housekeeper" in the optical mouse. Here is a very important concept that everyone should know that DPI is affecting the mouse positioning. DPI is it used to measure the number of points that the mouse can detect, the smaller the DPI, the less the number of points used, the positioning accuracy is low; the DPI is more, the number of position points, the positioning accuracy is high.

Normally, the scanning accuracy of the conventional mechanical mouse is below 200 dpi, while the photovoltaic mouse can reach 400 or even 800dpi, which is why the optical mouse can easily exceed the mechanical mouse in positioning accuracy. reason.

Optical lens assembly

The optical lens assembly is placed at the bottom position of the optical mouse, and the optical lens assembly consists of a rocking mirror and a circular lens. Among them, the rocking mirror is responsible for transmitting the light emitted by the light emitting diode to the bottom of the mouse and illuminates.

The circular lens is equivalent to a camera's lens, which is responsible for transmitting the bottom image of the mouse that has been illuminated to the small hole at the bottom of the optical sensor. By watching the back cover of the optical mouse, we can see that the circular lens is like a camera through the test. The author concludes that the optical path of the radius is also blocked, and it will immediately lead to the "blindness" of the optical mouse. . As a result, the photoelectric mouse cannot be positioned, thereby visible importance of optical lens assemblies.

LED

The optical sensor is necessary to continuous "imaging" at the bottom of the mouse that lacks the light, and naturally does not have the support of "photographic lamp". Otherwise, the image taken from the bottom of the mouse will be a dark, dark image unable to compare, of course, is more optically positioned.

Typically, the light-emitting diode used in the photovoltaic mouse is red (there is also a portion blue), and is highlighted (in order to obtain sufficient light weight). The red light emitted by the light-emitting diode is partially illuminated by the optical lens (i.e., in the prism) by the optical lens (i.e. in the prism); another portion is transmitted directly to the front side of the optical sensor. In summary, the role of the light-emitting diode is the light source required to generate an optic mouse operation.

Touch button

The mouse without button is not imagined, so there will be at least two touch buttons on the ordinary photoelectric mouse. Founder is soldered on the PCB of the square, there is three touched buttons. In addition to the left button, right-click, the middle button is assigned to the pages roller. The advanced mouse usually has x, y two flopping rollers, and most of the optical mud is still like this square, only one page pages. When scrolling on the page, the "document" or "web page" that is watching is being viewed up and down. When the roller is pressed, the "middle key" on the PCB will act. Note: The action generated by the "middle key" can be defined by the user according to its own needs. After we remove the page roller, you can see the wheel position, "Tibet" has a pair of photoelectric "transmitted / reception" devices. The "roller" has a raster, which is the optical path of the photovoltaic "transmitted / received" device due to the "block" of the grid, which can generate a pages pulse signal, which transmits the control chip to Windows operations. The system can generate a pages.