CN1988678A - Color wheel feedback system detecting and control method - Google Patents
Color wheel feedback system detecting and control method Download PDFInfo
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- CN1988678A CN1988678A CN 200510111959 CN200510111959A CN1988678A CN 1988678 A CN1988678 A CN 1988678A CN 200510111959 CN200510111959 CN 200510111959 CN 200510111959 A CN200510111959 A CN 200510111959A CN 1988678 A CN1988678 A CN 1988678A
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- color wheel
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Abstract
This invention relates to a method for checking a color wheel feedback system, which particularly refers to a method for checking the feedback system by testing its output voltage waveform. The method includes: it connects the testing unit to the output of the feedback system of the color wheel. Then, it adjusts the measurement range of the testing unit when the Ub waveform is steady to measure the Ubmas and Ubmark of the Ub waveform. If Ubmax is lesser than alphaUL and Ubmark is greater than betaUH, then the color wheel is qualified, in which UH and UL are respectively refers to the high threshold level and low threshold level of control logic circuit elements in the feedback system, and alpha, beta are value of experience, and alpha is greater than zero and is equal or lesser than one, and beta is equal or greater than one.
Description
Technical field
The present invention relates to a kind of color wheel feedback system detecting and control method, relate in particular to the whether qualified detecting and control method of a kind of voltage waveform reflection reponse system of utilizing the reponse system output.
Background technology
See also Fig. 1, Fig. 1 is an one chip DLP ray machine schematic diagram.As shown in the figure, one chip DLP ray machine comprises light source 11, condenser lens 12, color wheel system 13, prism 14, DLF drive plate 15 and projection prism 16.In the ray machine course of work, the light line focus lens 12 that light source 11 sends, focus on color wheel system 13, color wheel system 13 high speed rotary color wheel can see through the light of different wave length, different colours according to the light-filtering characteristic of different colour wheel sections, the light that sees through is projected on the DLF drive plate 15 through prism 14, the dmd chip group of DLF drive plate 15 reflexes on the screen 17 through projection prism 16 according to the light that the intensity of digital signal in each visual field of vision signal will project on the DMD, human vision system is superimposed color in proper order, just sees a width of cloth full-color image.
Can get U by Fig. 2
b=U
dR
bI
b, U wherein
bBe the magnitude of voltage that b is ordered, U
dBe the fixed voltage value of input, R
bIt is the fixed resistance value of a resistance.When the mark part of motor drive shaft during over against photoelectrical coupler, the light of reflection weakens, I
bVery little, the dividing potential drop of Rb resistance is very little, and therefore, Ub is in high potential; When other position alignment transducer of rotating shaft, phototriode is subjected to illumination and conducting, I
bBecome big, the dividing potential drop of Rb resistance increases, and Ub is in electronegative potential thus.Select suitable logic control element 24, make when Ub is in high potential, its value is greater than the high threshold level U of logic control element
H, digital feedback signal is 1, corresponding Uc is a high level; When Ub was in electronegative potential, its value was less than the low-threshold-level U of reponse system circuit
L, digital feedback signal is 0, corresponding Uc is a low level.As shown in Figure 3A, it has reflected the Ub and the Uc waveform of normal color wheel feedback system feedback.The mark zone of motor drive shaft is presented as Ub voltage peak part on the Ub waveform, be presented as high level on the Uc waveform; Correspondingly, the non-marked area of motor drive shaft is presented as the base section of Ub on the Ub waveform, be presented as low level on the Uc waveform.When motor rotated a circle, Ub and Uc had just experienced one-period, and therefore, the frequency of the voltage waveform of Ub and Uc has characterized the rotational frequency of colour wheel.We can see from Fig. 3 A, and it is fine that the cycle of Uc and the period of waves of Ub coincide, and just digital feedback signal has reflected the rotational frequency of colour wheel exactly.
Correct digital feedback signal is the assurance of one chip DLP ray machine operate as normal.But Ub can be subjected to color wheel feedback system resistance R a, Rb and temperature, motor drive shaft surface state, and the distance of photoelectrical coupler and motor drive shaft, stray light during lamp work, the influence of factors such as photoelectrical coupler operating time produces fluctuation.Can see also that from Fig. 3 A the Ub bottom electrical is pressed with a little fluctuations, but because the maximum of the Ub bottom that fluctuation range causes much smaller than U
LSo, can not cause the variation of Uc voltage and digital feedback signal.
If but Ub bottom magnitude of a voltage fluctuation is positioned at U
LAnd U
HBetween or greater than U
HThe time, because the logic behaviour of logical device can make Uc change high potential into from electronegative potential, digital feedback signal becomes logical one from logical zero, and in fact the color wheel motor axle of this moment is in the non-marked part, and digital feedback signal should be logical zero.Shown in Fig. 3 B, during Ub＞1.37V, Uc is a high potential, and digital feedback signal is a logical one, when the undulating value of Ub bottom voltage surpasses 1.37V, just can cause the unusual of Uc voltage waveform.This moment, reponse system can not correctly reflect the rotational frequency of colour wheel, can cause that thus entanglement, the colour wheel of motor drive signal rotates unusually, colour wheel rotates with matching of lamp pulse and causes various abnormal work phenomenons such as film flicker so that system in case of system halt.
Generally can not detect in the prior art, therefore cause the repair rate of one chip DLP ray machine high color wheel feedback system.
Summary of the invention
The invention provides a kind of color wheel feedback system detecting and control method, comprising: the feedback output end that checkout gear is connected on color wheel feedback system; After treating the waveform stabilization of voltage U b of feedback output end of described color wheel feedback system, adjust the range of described checkout gear, measure the maximum voltage Ubmax of Ub waveform bottom and the voltage U bmark at Ub waveform top; As Ubmax＜α U
LAnd Ubmark＞β U
HThe time, described color wheel feedback system is qualified, wherein U
HAnd U
LBe respectively the high threshold level and the low-threshold-level of the logic control element of reponse system circuit, α, β are empirical value, 0＜α≤1, β 〉=1.
In above-mentioned detecting and control method, described determinator is an oscilloscope.
In above-mentioned detecting and control method, described color wheel feedback system is a reflecting photoelectric coupler.
Method provided by the invention can make things convenient for and judge by detecting rotational frequency that whether color wheel feedback system correctly fed back colour wheel whether the one chip DLP ray machine of the color wheel system of color wheel feedback system, this color wheel feedback system correspondence, this colour wheel correspondence is qualified effectively, reduce the repair rate of one chip DLP ray machine thus, improve the quality of products.
Description of drawings
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail, wherein:
Fig. 1 is an one chip DLP ray machine schematic diagram;
Fig. 2 is reponse system and circuit diagram thereof;
Fig. 3 A is the Ub and the Uc waveform of normal color wheel feedback system feedback;
Fig. 3 B is Ub and the Uc waveform that unusual color wheel feedback system feeds back;
Fig. 4 illustrates the Ub and the Uc waveform of another color wheel feedback system feedback;
Fig. 5 is the change curve of certain ray machine Ubmax voltage with operating time (temperature);
Fig. 6 A-B is the Ub waveform of two different color wheel feedback systems of employing the present invention detection.
Embodiment
For the convenience of explaining, now define following parameters:
The maximum voltage of Ubmax:Ub waveform bottom;
The voltage at Ubmark:Ub waveform top;
U
H: the high threshold level of logic control element;
U
L: the low-threshold-level of logic control element.
As the above analysis, as Ubmax＞U
HOr Ubmark＜U
LThe time, the Uc waveform must be inconsistent with Ub, but at U
L＜U＜U
HOne section, each logic control circuit elements design difference, it is 1 or 0 indeterminate causing this section logical inverse feedback signal, therefore as Ubmax＜U
LAnd Ubmark＞U
HThe time, can guarantee that the Uc waveform is consistent with the Ub waveform, promptly reponse system has reflected the rotational frequency of colour wheel exactly.
See also Fig. 4, Fig. 4 illustrates the Ub and the Uc waveform of another color wheel feedback system feedback.In the feedback circuit of this system, U
H=2.0v, U
L=800mv, so Ubmax＜U
L=800mvUbmark＞U
H=2.0v just can meet the requirements.As shown in the figure, Ubmax=900mv, Ubmark=4.75v, meet above-mentioned requirements and Uc waveform and Ub meet ground fine.But Ubmax can be subjected to the influence of many factors, with the temperature is example, ray machine was at preceding 30 minutes of work, working temperature can raise gradually, and the temperature of photoelectrical coupler part can be increased to 70 ℃ from initial room temperature, and Fig. 5 is the change curve of certain ray machine Ubmax voltage with operating time (temperature), can see along with operating time coupler section temperature raises gradually, Ubmax also raises gradually, so Ubmax (is Ubmax＞U with regard to existing above the logical device setting also
H) and make the unusual possibility of digital feedback signal, therefore in order to eliminate the hidden danger of ray machine abnormal work, judge whether qualified standard is Ubmax＜α U to reponse system
LAnd Ubmark＞β U
H, α, β are empirical value, 0＜α≤1, β 〉=1.
Now, we sum up the detecting and control method that is used to judge that reponse system is whether qualified of the present invention:
1. open the drive unit of the color wheel system 13 of DLP drive plate 15 (as shown in Figure 1), make color wheel system 13 operate as normal; Oscilloscope is connected on the feedback output end (as the b point of Fig. 2) of reflecting photoelectric coupler.
2. after treating the colour wheel stability of rotation in the color wheel system 13, open oscilloscope, adjust oscillographic range, make the Ub waveform of color wheel feedback system output point on the time shaft of oscilloscope screen, comprise a complete cycle at least, and on voltage axis, can measure Ub each several part magnitude of voltage.
3. behind the Ub waveform stabilization that oscilloscope shows, measure Ubmax and Ubmark.
4. as Ubmax＜α U
LAnd Ubmark＞β U
HThe time, judge that color wheel feedback system is qualified,, α, β are empirical value, 0＜α≤1, β 〉=1.
Next, we judge two ray machines based on said method: Fig. 6 A-B is the Ub waveform of two different color wheel feedback systems of employing the present invention detection.In the feedback circuit of native system, U
H=2.0v, U
L=800mv, α=0.5, β=1, criterion is Ubmax＜α U
L=400mv and Ubmark＞β U
H=2.0v.Following table is corresponding result of determination:
| Color wheel feedback system | Ubmax | Ubmark | Result of determination |
| (a) | 200mv | 4.48v | Qualified |
| (b) | 776mv | 4.60v | Defective |
Should be understood that determinator is not limited to oscilloscope in the foregoing description, color wheel feedback system also is not limited to reflecting photoelectric coupler.All comprise in the present invention as long as can measure the determinator of Ub value, same, measure as long as satisfy all available method provided by the present invention of the reponse system of requirement of the present invention.
The foregoing description is only given an example for convenience of description, is not the restriction to scope of the present invention.For the general personnel in present technique field, can under the situation that does not break away from spirit of the present invention, make many variations.Therefore, the scope that the present invention advocated should be as the criterion so that the claim in claims is described.
Claims (3)
1. color wheel feedback system detecting and control method comprises:
Checkout gear is connected on the feedback output end of color wheel feedback system;
After treating the waveform stabilization of voltage U b of feedback output end of described color wheel feedback system, adjust the range of described checkout gear, measure the maximum voltage Ubmax of Ub waveform bottom and the voltage U bmark at Ub waveform top;
As Ubmax＜α U
LAnd Ubmark＞β U
HThe time, described color wheel feedback system is qualified, wherein U
HAnd U
LBe respectively the high threshold level and the low-threshold-level of the logic control element of reponse system circuit, α, β are empirical coefficient, 0＜α≤1, β 〉=1.
2. detecting and control method as claimed in claim 1 is characterized in that, described determinator is an oscilloscope.
3. detecting and control method as claimed in claim 1 is characterized in that, described color wheel feedback system is a reflecting photoelectric coupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510111959 CN1988678A (en) | 2005-12-23 | 2005-12-23 | Color wheel feedback system detecting and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510111959 CN1988678A (en) | 2005-12-23 | 2005-12-23 | Color wheel feedback system detecting and control method |
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| Publication Number | Publication Date |
|---|---|
| CN1988678A true CN1988678A (en) | 2007-06-27 |
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ID=38185274
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510111959 Pending CN1988678A (en) | 2005-12-23 | 2005-12-23 | Color wheel feedback system detecting and control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101943609B (en) * | 2009-12-01 | 2012-07-18 | 哈尔滨新光光电科技有限公司 | Infrared scene generation method for superposing double-set DMD display images on object surface |
| WO2015169144A1 (en) * | 2014-05-06 | 2015-11-12 | 杭州远方光电信息股份有限公司 | Image spectrum measurement device |
-
2005
- 2005-12-23 CN CN 200510111959 patent/CN1988678A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101943609B (en) * | 2009-12-01 | 2012-07-18 | 哈尔滨新光光电科技有限公司 | Infrared scene generation method for superposing double-set DMD display images on object surface |
| WO2015169144A1 (en) * | 2014-05-06 | 2015-11-12 | 杭州远方光电信息股份有限公司 | Image spectrum measurement device |
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