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Device and method of measuring body displacement

An object displacement and object technology, applied in the field of displacement devices, can solve the problems of inconvenience, slow response, and inability to accurately detect displacement.

Inactive Publication Date: 2010-03-17
DARFON ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the finger moves quickly, this input device cannot accurately detect the displacement, making the coordinates seem to be unresponsive on the screen and causing inconvenience in use

Method used

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  • Device and method of measuring body displacement
  • Device and method of measuring body displacement
  • Device and method of measuring body displacement

Examples

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Embodiment Construction

[0030] Philips’ US patent US 6,707,027 discloses an input device for measuring displacement, which uses a fixed-frequency drive signal to drive a laser diode. This method is only suitable for detecting a specific moving speed of an object. When the speed is too fast, the detection will be inaccurate. .

[0031] Please refer to figure 1 , which shows a block diagram of an input device for measuring the displacement of an object according to the present invention. The input device 100 includes a driving unit 110 , a laser diode 120 and a light sensor 130 . The driving unit 110 generates a variable frequency driving signal Id to drive the laser diode 120 . In this embodiment, the driving signal Id with different frequencies is used to drive the laser diode, so when the speed of the object is fast or slow, it can be accurately detected. Figure 2A It is the waveform diagram of the variable frequency drive signal Id. Number 1 represents the subcomponent with a faster frequency,...

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Abstract

The invention relates to the method used to measure object displacement. It includes the following steps: generating frequency conversion drive signal includes the first and second sub components withdifferent frequency which respectively has ascent and descent stages to emit one laser beam; casting the laser beam to one object surface, reflecting and receiving one mixed signal which has the first and second sub signals corresponding to the ascent and descent stages of the first sub component, has the third and fourth sub signals corresponding to the second one; receiving the mixed signal andoutputting pulse numbers from the first to the fourth corresponding with the signals; confirming the object displacement according to one of the differences between the first and second pulse numbers, the third and fourth ones.

Description

technical field [0001] The invention relates to a device for measuring the displacement of an object, in particular to a device for measuring the displacement of an object by using laser light. Background technique [0002] There are many input devices on the market that utilize optical properties to detect displacement, such as optical mice used in computers. There is an optical sensor at the bottom of the optical mouse, which captures multiple images at regular intervals, and determines the displacement of the mouse by comparing the differences between the captured images by the processor. [0003] Optical mice are popular because they are more accurate than mechanical mice using mouse balls. In addition, if it is applied to portable electronic products, such as PDA, the user does not have a flat surface for the operation of the optical mouse, so the optical mouse is not suitable. [0004] The US patent US 6,707,027 of Philips discloses an input device for measuring disp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/033G06F3/0354
Inventor 马国栋廖炳谦李建兴
Owner DARFON ELECTRONICS CORP