Optical sensor and its electronic equipment

[0033] Example one

[0034] Please refer to FIG. 2, which shows a block diagram of the optical sensing device connected to a computer according to the first embodiment of the present invention. The optical sensing device 100 is, for example, an optical mouse for sensing a relatively moving object Mr. The optical sensing device 100 includes a light sensing component 110, a modulation unit 120 and a signal processing unit 170. The light sensing component 110 uses a laser diode to send a laser signal L10 to the object Mr according to the modulation signal M10 (e.g., a triangular wave signal) output by the modulation unit 120, and uses a photo diode to receive the laser light L10 reflected from the object Mr to output the sensing Signal S10. The signal processing unit 170 is coupled to the light sensing component 110 to perform signal processing on the sensing signal S10 and output the first data signal D10 and the second data signal D12 accordingly. The frequencies of the first data signal D10 and the second data signal D12 are respectively located in the first frequency band FB1 and the second frequency band FB2 where the sensing signal S10 is different. The signal processing unit (not shown in the figure) of the computer 160 performs data processing according to the first and second data signals D10 and D12, and accordingly generates a functional operation corresponding to the relative movement of the optical sensing device 100 and the object Mr (such as a desktop) , For example, move the cursor position on the display (not shown in the figure) of the computer 160.

[0035] Those skilled in the art can understand that the technology of the present invention is not limited to the above-mentioned embodiments. The optical sensing device 100 of the present invention can also use any other light sensing components to sense the relative movement relationship with the object Mr according to the modulation signal M10, and output the sensing signal S10 accordingly.

[0036] In addition, the signal processing unit 170 further includes an impedance conversion unit 130, a first differentiation unit 180, and a second differentiation unit 182. The impedance conversion unit 130 is coupled to the light sensing component 110 for performing impedance conversion on the sensing signal S10 and outputting an impedance conversion signal V10. The first differentiation unit 180 is coupled to the impedance conversion unit 130 for performing a first differentiation operation on the impedance conversion signal V10 to output the first data signal D10 with the first frequency band FB1; the second differentiation unit 182 is also coupled to the impedance conversion The unit 130 is configured to perform a second differential operation on the impedance conversion signal V10 to output a second data signal D12 having a second frequency band FB2. The first frequency band FB1 is 1 Hz to 10 kHz, and the second frequency band FB2 is 10 kHz to 1 MHz.

[0037] In addition, the first differentiating unit 180 further includes a first differentiator 140, a first bandpass filter 145, and a first amplifier 150. The first differentiator 140 is coupled to the impedance conversion unit 130 for performing the aforementioned first differentiation operation on the impedance conversion signal V10 according to the first differentiation range, such as the first frequency band FB1, to output the first differentiation signal d10. The first band pass filter 145, for example, a passive or active band pass filter, is coupled to the first differentiator 140 to filter the first differential signal d10, and accordingly output the first filter having the first frequency band FB1 Signal f10. The first amplifier 150 is coupled to the first band-pass filter 145 to amplify the first filtered signal f10 and output the first data signal D10 accordingly. Similarly, the second differentiating unit 182 further includes a second differentiator 142, a second band-pass filter 147, and a second amplifier 152. The second differentiator 142 is coupled to the impedance conversion unit 130 for performing the aforementioned second differentiation operation on the impedance conversion signal V10 according to the second differentiation range, such as the second frequency band FB2, to output the second differentiation signal d12. The second band pass filter 147, for example, a passive or active band pass filter, is coupled to the second differentiator 142 to filter the second differential signal d12, and accordingly output the second filter having the second frequency band FB2 Signal f12. The second amplifier 152 is coupled to the second band-pass filter 147 to amplify the second filtered signal f12 and output the second data signal D12 accordingly.

[0038]Therefore, the optical sensing device 100 of the present invention can sense objects Mr with different relative moving speeds (for example, extremely fast and extremely slow), and perform data processing to generate data signals D10 and D12 of different frequency bands FB1 and FB2 to output to the computer 160 , So that the computer 160 can generate functional operations such as fast or slow cursor movement on the display, effectively improving the sensing sensitivity of the optical sensing device 100.

[0039] Example two

[0040] Please refer to FIG. 3, which shows a block diagram of an optical sensing device connected to a computer according to a second embodiment of the present invention. The main difference between the optical sensing device 300 of this embodiment and the optical sensing device 100 of the first embodiment is that the signal processing unit 370 of this embodiment further includes a time division multiplexing (TDM) encoder 310 and a TDM translation. Coder 320. The TDM encoder 310 is coupled between the impedance conversion unit 130 and the first differentiation unit 180 and the second differentiation unit 182, and the TDM decoder 320 is coupled after the first differentiation unit 180 and the second differentiation unit 182. In addition, the modulation unit 120 outputs a first frequency modulation signal M20 and a second frequency modulation signal M22, where the first frequency is, for example, 100 Hz, and the second frequency is, for example, 10 KHz. The light sensing component 110 generates a first sensing signal S20 having a first frequency band FB1' at time t1 according to the first frequency modulation signal M20, and generates a first sensing signal S20 having a second frequency band FB2' at time t2 according to the second frequency modulation signal M22 Two sensing signal S22. The first frequency band FB1' is, for example, 100 Hz to 10 KHz, and the second frequency band FB2' is, for example, 10 KHz to 1 MHz. The impedance conversion unit 130 is coupled to the light sensing component 110 for respectively performing impedance conversion on the first sensing signal S20 and the second sensing signal S22, and then outputting the first impedance conversion signal V20 and the second impedance conversion signal V22, such as Shown in Figure 4.

[0041] Furthermore, the TDM encoder 310 is coupled to the impedance conversion unit 130, and is used for switching respectively at time t1 and t2 according to the first enabling signal E20 and the second enabling signal E22 as shown in FIG. 4 provided by the modulation unit 120 The first impedance conversion signal V20 and the second impedance conversion signal V22 are output. The first differentiation unit 180 is coupled to the TDM encoder 310 for performing a first differentiation operation on the first impedance conversion signal V20 to output the first time-sharing data signal D20. The second differentiation unit 182 is coupled to the TDM encoder 310 for performing a second differentiation operation on the impedance conversion signal V22 to output a second time-sharing data signal D22.

[0042] The first differentiating unit 180 includes, for example, a first differentiator 140, a first band pass filter 145, and a first amplifier 150. The first differentiator 140 is coupled to the impedance conversion unit 130 for performing a first differentiation operation on the impedance conversion signal V20 according to the first differentiation range (not less than the first frequency band FB1') to output the first differentiation signal d20. The first band pass filter 145 is coupled to the first differentiator 140 for filtering the first differentiated signal d20 and outputting the first filtered signal f20 accordingly. The first amplifier 150 is coupled to the first band-pass filter 145 to amplify the first filtered signal f20 and output the first time-sharing data signal D20 accordingly. Similarly, the second differentiating unit 182 further includes a second differentiator 142, a second band-pass filter 147, and a second amplifier 152. The second differentiator 142 is coupled to the impedance conversion unit 130 for performing a second differentiation operation on the impedance conversion signal V22 according to the second differentiation range (not less than the second frequency band FB2') to output the second differentiation signal d22. The second band-pass filter 147 is coupled to the second differentiator 142 for filtering the second differential signal d22 and outputting the second filtered signal f22 accordingly. The second amplifier 152 is coupled to the second band-pass filter 147 to amplify the second filtered signal f22 and output the second time-sharing data signal D22 accordingly.

[0043] The TDM decoder 320 is coupled to the first differentiation unit 180 and the second differentiation unit 182, and compares the first time-sharing data signal D20 and the second time-sharing data signal D22 according to the first enabling signal E20 and the second enabling signal E22 The decoding operation is performed to output the first data signal D30 with the first frequency band FB1' and the second data signal D32 with the second frequency band FB2' to the computer 160. Therefore, the optical sensing device 300 and the second differentiation unit 182 of the present invention can sense objects Mr with different relative moving speeds (for example, extremely fast and extremely slow), and perform data processing to generate data of different frequency bands FB1' and FB2' The signals D30 and D32 are output to the computer 160, so that the computer 160 can generate functional operations such as fast or slow cursor movement on the display, effectively improving the sensing sensitivity of the optical sensing device 300.

[0044] Those skilled in the art can know that the technology of the present invention is not limited to the above two embodiments. The optical sensing device 100 (or 300) of the present invention can also use any other signal processing unit 170 (or 370) to process the sensing signal S10 (or S20 and S22), and accordingly output the frequency bands FB1 and FB2 (or FB1' and FB2') data signals D10 and D12 (or D30 and D32). Alternatively, the signal processing unit 170 (or 370) can also use any other first differentiation unit 180 and second differentiation unit 182 to perform the first and second differentiation operations on the impedance conversion signal V10 (or V20 and V22), respectively. To output data signals D10 and D12 (or D30 and D32) with frequency bands FB1 and FB2 (or FB1' and FB2'). Alternatively, the first differentiating unit 180 or the second differentiating unit 182 may also be coupled to any other first signal amplifying unit or second signal amplifying unit after the first differentiator 140 or the second differentiator 142 to perform the differentiation The signal d10 or d12 (or d20 or d22) is amplified to output data signals D10 and D12 (or D20 and D22) with frequency bands FB1 and FB2 (or FB1' and FB2'). As long as it can generate a sensing signal for detecting relative movement with an object based on the modulation signal, and can process the sensing signals of more than two different frequency bands to generate signal data corresponding to more than two frequency bands, so as to improve the sensitivity of the optical sensing device The purpose does not depart from the patent scope of the present invention.

[0045] As described above, the modulation signal M10 (or M20 and M22) required by the optical sensing device 100 (or 300) of the present invention can also be directly provided by the computer 160, or the computer 160 can generate a square wave and then pass the modulation unit 120. Integrating circuit to generate triangle wave. The modulation unit 120 may directly use a signal generator to generate a triangle wave, or use an oscillator or a signal generator to generate a square wave and then an integration circuit to generate a triangle wave.

[0046] In addition, although the above two embodiments divide the frequency of the sensing signal into two frequency bands for processing, if the sensing signal is divided into two or more frequency bands for processing, it also belongs to the scope of the present invention.

[0047] In the optical sensing device and its electronic equipment disclosed in the above embodiments of the present invention, the optical sensing device can sense objects with different relative moving speeds (for example, extremely fast and extremely slow), and correspond to sensing of at least two different frequency bands. The signals are processed separately to generate at least two sets of data signals with different frequency bands and output to the computer, so that the computer can generate functional operations such as fast or slow cursor movement on the display, effectively improving the performance of optical sensing devices such as optical mice. Sensing sensitivity and work efficiency.