CN105549310A - Multi-color wheel synchronization method and laser projection device - Google Patents

Multi-color wheel synchronization method and laser projection device Download PDF

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Publication number
CN105549310A
CN105549310A CN201510919831.3A CN201510919831A CN105549310A CN 105549310 A CN105549310 A CN 105549310A CN 201510919831 A CN201510919831 A CN 201510919831A CN 105549310 A CN105549310 A CN 105549310A
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sensor
colour wheel
area
detection light
emission
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CN105549310B (en
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崔荣荣
李健锋
郭大勃
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Qingdao Hisense Laser Display Co Ltd
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Hisense Group Co Ltd
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/206—Control of light source other than position or intensity

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)

Abstract

The invention discloses a multi-color wheel synchronization method and a laser projection device. A first area in a wheel surface of a first color wheel is detected through a first sensor group, and a first level jump signal is generated when the first color wheel detects the first area for the first time during each rotation cycle; a second area in a wheel surface of a second color wheel is detected through a second sensor group, and a second level jump signal is generated when the second color wheel detects the second area for the first time during each rotation cycle; and whether the time difference between the first level jump signal and the second level jump signal is a threshold is judged, and if not, the rotation speed of the first color wheel and/or the second color wheel is adjusted to enable the time difference between the first level jump signal and the second level jump signal to be the threshold.

Description

A kind of polychrome wheel synchronous method and laser projection device
Technical field
The present invention relates to display technique field, particularly relate to a kind of polychrome wheel synchronous method and laser projection device of LASER Light Source.
Background technology
At present, projector is widely used in the various application scenarios such as film broadcasting, meeting and publicity.As everyone knows, in the light source of projector, fluorescent powder wheel is often adopted to provide sequence of colored lights.Wherein, not homochromy section that is taken turns by fluorescent powder in turn and be periodically arranged on the travel path of exciting light, and then the fluorescent material utilizing exciting light to come on not homochromy section of excitated fluorescent powder wheel, to produce the fluorescence without color.But the spectral range produced due to fluorescent material is wider, makes the excitation of part fluorescence not enough, and then cause the colour gamut of light source large not.In this case, generally need to be filtered fluorescence by optical filter, to improve the excitation of fluorescence.But, because the spectral range of the fluorescence of different colours partly overlaps, same optical filter cannot be utilized to filter, therefore need the optical filter that the fluorescence for different colours provides different.In the prior art, by multiple optical filter composition filter wheel that can filter different colours, and synchronous rotary can be taken turns with fluorescent powder, thus acquisition image quality is clear, the picture of bright colors.Above-mentioned framework is commonly referred to as double-coloredly takes turns light source framework.
Take turns in light source framework double-colored, the most important thing is to need fluorescent powder is taken turns and filter wheel synchronous rotary.If rotate asynchronous between fluorescent powder wheel and filter wheel, the phenomenon such as fuzzy pictures, color confusion obtained can be caused.In a kind of implementation, take turns employing coaxial design by double-colored, but this design requires for assembly precision high, cause the colour mixture time period to correct again once produce error, can only reject colour mixture section by rear end and ensure the purity that color exports, this also causes the loss of light-source brightness.In a kind of implementation, double-colored wheel adopts the design of separation non-coaxial, and in this technology, the motor shaft of fluorescent powder wheel and filter wheel independently rotates.Take turns and filter wheel synchronous rotary to make fluorescent powder, a MARK tag block can be set on the surface respectively at the motor shaft of the motor shaft of fluorescent powder wheel and filter wheel, be generally black belt, there is absorption effects, and correspondence arranges sensor, send detection light by sensor and formed oscillogram by the situation that MARK tag block absorbs and reflects, and judge the synchronization extent of two colour wheels according to oscillogram.But this setup, black belt sticks to motor shaft surface on the one hand, and colour wheel environment temperature is higher, black belt easily comes off under being in hot environment for a long time as organism, cause needing dismounting product to carry out maintain and replace, on the other hand, black belt also may with the position set when pasting, such as there is error in color zone boundary place, when software detection is to usually also needing during error to take some debugging methods to reduce further owing to assembling the error caused.
Therefore, need to provide a kind of LASER Light Source polychrome to take turns synchronous method, polychrome can be improved and take turns synchronous efficiency and precision.
Summary of the invention
The embodiment of the present invention provides a kind of polychrome to take turns synchronous method and laser projection device, in order to solve the how simple, fast problem realizing the precise synchronization of polychrome wheel.
The embodiment of the present invention provides a kind of polychrome to take turns synchronous method, and the method comprises:
Detected the first area in the wheel face of the first colour wheel by first group of sensor, and produce the first level skip signal when each swing circle first time of the first colour wheel detects described first area;
Detected the second area in the wheel face of the second colour wheel by second group of sensor, and produce second electrical level skip signal when each swing circle first time of the second colour wheel detects described second area;
Whether the mistiming judging described first level skip signal and described second electrical level skip signal is threshold value, if not, then adjust the rotating speed of described first colour wheel and/or described second colour wheel, the mistiming making described first level skip signal and described second electrical level skip signal is described threshold value.
Optionally, described first area is the transparent region in described first colour wheel, make the detection light of described first group of sensor emission when each swing circle first time of the first colour wheel detects described first area, the detection light of described first group of sensor emission passes described first area and is received by described first group of sensor, produces described first level skip signal; Or, described first area is aluminium base district, make the detection light of described first group of sensor emission when each swing circle first time of the first colour wheel detects described first area, the detection light of described first group of sensor emission is reflected by described first area and is received by described first group of sensor, produces described first level skip signal;
Described second area is the transparent region in described second colour wheel, make the detection light of described second group of sensor emission when each swing circle first time of the second colour wheel detects described second area, the detection light of described second group of sensor emission passes described second area and is received by described second group of sensor, produces described second electrical level skip signal; Or, described second area is the filtered region in described second colour wheel, surface coverage one deck reflecting coating of described filtered region, for reflecting the detection light of described second group of sensor emission, make the detection light of described second group of sensor emission when each swing circle first time of the second colour wheel detects described second area, the detection light of described second group of sensor emission is reflected by described second area and is received by described second group of sensor, produces described second electrical level skip signal;
Wherein, the transparent region in the transparent region in described first colour wheel or described second colour wheel is made up of clear glass, or is made up of transparent diffuser panel material.
Optionally, the described first area detected by first group of sensor in the first colour wheel, and produce the first level skip signal when each swing circle first time of the first colour wheel detects described first area, comprising:
Described first group of sensor comprises the first emission sensor and the first receiving sensor, and described first emission sensor is positioned at the first surface of described first colour wheel, for emission detection light; Described first receiving sensor is positioned at second of described first colour wheel and is positioned in the light path of the detection light that described first emission sensor is launched;
The detection light that described first emission sensor is launched is when each swing circle first time of the first colour wheel detects described first area, described detection light passes described first area and is received by described first receiving sensor, produces described first level skip signal.
Optionally, the described first area detected by first group of sensor in the first colour wheel, and produce the first level skip signal when each swing circle first time of the first colour wheel detects described first area, comprising:
Described first group of sensor comprises the first emission sensor and the first receiving sensor, and described first emission sensor is positioned at the first surface of described first colour wheel, for emission detection light; Described first receiving sensor is positioned at second of described first colour wheel and is positioned in the light path of the detection light that described first emission sensor is launched;
The detection light that described first emission sensor is launched is when each swing circle first time of the first colour wheel detects described first area, and the detection light that described first emission sensor is launched is reflected, and produces described first level skip signal.
Optionally, the described first area detected by first group of sensor in the first colour wheel, and produce the first level skip signal when each swing circle first time of the first colour wheel detects described first area, comprising:
Described first group of sensor comprises the first sending and receiving sensor, and described first sending and receiving sensor is used for emission detection light, and the light path of the detection light of described first sending and receiving sensor transmitting is vertical with the one side of described first colour wheel;
Described first transmitting-receiving penetrates the detection light of sensor emission when each swing circle first time of the first colour wheel detects described first area, and described detection light, through described first area, produces described first level skip signal.
Optionally, the described first area detected by first group of sensor in the first colour wheel, and produce the first level skip signal when each swing circle first time of the first colour wheel detects described first area, comprising:
Described first group of sensor comprises the first sending and receiving sensor, and described first sending and receiving sensor is used for emission detection light, and the light path of the detection light of described first sending and receiving sensor transmitting is vertical with the one side of described first colour wheel;
The reflected light that the detection light that sensor emission is penetrated in described first transmitting-receiving is formed when each swing circle first time of the first colour wheel detects described first area is received by described first sending and receiving sensor, produces described first level skip signal.
Optionally, detected the second area in the second colour wheel by second group of sensor, and produce second electrical level skip signal when each swing circle first time of the second colour wheel detects described second area, comprising:
Described second group of sensor comprises the second emission sensor and the second receiving sensor, and described second emission sensor is positioned at the first surface of described second colour wheel, for emission detection light; Described second receiving sensor is positioned at second of described second colour wheel and is positioned in the light path of the detection light that described second emission sensor is launched;
The detection light that described second emission sensor is launched is when each swing circle first time of the second colour wheel detects described second area, described detection light passes described second area and is received by described second receiving sensor, produces described second electrical level skip signal.
Optionally, detected the second area in the second colour wheel by second group of sensor, and produce second electrical level skip signal when each swing circle first time of the second colour wheel detects described second area, comprising:
Described second group of sensor comprises the second emission sensor and the second receiving sensor, and described second emission sensor is positioned at the first surface of described second colour wheel, for emission detection light; Described second receiving sensor is positioned at second of described second colour wheel and is positioned in the light path of the detection light that described second emission sensor is launched;
The detection light that described second emission sensor is launched is when each swing circle first time of the second colour wheel detects described second area, and the detection light that described second emission sensor is launched is reflected, and produces described second electrical level skip signal.
Optionally, detected the second area in the second colour wheel by second group of sensor, and produce second electrical level skip signal when each swing circle first time of the second colour wheel detects described second area, comprising:
Described second group of sensor comprises the second sending and receiving sensor, and described second sending and receiving sensor is used for emission detection light, and the light path of the detection light of described second sending and receiving sensor transmitting is vertical with the one side of described second colour wheel;
Described second transmitting-receiving penetrates the detection light of sensor emission when each swing circle first time of the second colour wheel detects described second area, and described detection light, through described second area, produces described second electrical level skip signal.
Optionally, detected the second area in the second colour wheel by second group of sensor, and produce second electrical level skip signal when each swing circle first time of the second colour wheel detects described second area, comprising:
Described second group of sensor comprises the second sending and receiving sensor, and described second sending and receiving sensor is used for emission detection light, and the light path of the detection light of described second sending and receiving sensor transmitting is vertical with the one side of described second colour wheel;
The reflected light that the detection light that described second sending and receiving sensor is launched is formed when each swing circle first time of the second colour wheel detects described second area is received by described second sending and receiving sensor, produces described second electrical level skip signal.
The embodiment of the present invention provides a kind of laser projection device, comprising:
First group of sensor, for detecting the first area in the wheel face of the first colour wheel, and produces the first level skip signal when each swing circle first time of the first colour wheel detects described first area;
Second group of sensor, for detecting the second area in the wheel face of the second colour wheel, and produces second electrical level skip signal when each swing circle first time of the second colour wheel detects described second area;
Control module, for judging whether the mistiming of described first level skip signal and described second electrical level skip signal is threshold value, if not, then adjust the rotating speed of described first colour wheel and/or described second colour wheel, the mistiming making described first level skip signal and described second electrical level skip signal is described threshold value.
Optionally, described first area is the transparent region in described first colour wheel, make the detection light of described first group of sensor emission when each swing circle first time of the first colour wheel detects described first area, the detection light of described first group of sensor emission passes described first area and is received by described first group of sensor, produces described first level skip signal; Or, described first area is aluminium base district, make the detection light of described first group of sensor emission when each swing circle first time of the first colour wheel detects described first area, the detection light of described first group of sensor emission is reflected by described first area and is received by described first group of sensor, produces described first level skip signal;
Described second area is the transparent region in described second colour wheel, make the detection light of described second group of sensor emission when each swing circle first time of the second colour wheel detects described second area, the detection light of described second group of sensor emission passes described second area and is received by described second group of sensor, produces described second electrical level skip signal; Or, described second area is the filtered region in described second colour wheel, surface coverage one deck reflecting coating of described filtered region, for reflecting the detection light of described second group of sensor emission, make the detection light of described second group of sensor emission when each swing circle first time of the second colour wheel detects described second area, the detection light of described second group of sensor emission is reflected by described second area and is received by described second group of sensor, produces described second electrical level skip signal;
Wherein, the transparent region in the transparent region in described first colour wheel or described second colour wheel is made up of clear glass, or is made up of transparent diffuser panel material.
Optionally, described first group of sensor comprises the first emission sensor and the first receiving sensor, and described first emission sensor is positioned at the first surface of described first colour wheel, for emission detection light; Described first receiving sensor is positioned at second of described first colour wheel and is positioned in the light path of the detection light that described first emission sensor is launched;
The detection light that described first emission sensor is launched is when each swing circle first time of the first colour wheel detects described first area, described detection light passes described first area and is received by described first receiving sensor, produces described first level skip signal.
Optionally, described first group of sensor comprises the first emission sensor and the first receiving sensor, and described first emission sensor is positioned at the first surface of described first colour wheel, for emission detection light; Described first receiving sensor is positioned at second of described first colour wheel and is positioned in the light path of the detection light that described first emission sensor is launched;
The detection light that described first emission sensor is launched is when each swing circle first time of the first colour wheel detects described first area, and the detection light that described first emission sensor is launched is reflected, and produces described first level skip signal.
Optionally, described first group of sensor comprises the first sending and receiving sensor, and described first sending and receiving sensor is used for emission detection light, and the light path of the detection light of described first sending and receiving sensor transmitting is vertical with the one side of described first colour wheel;
Described first transmitting-receiving penetrates the detection light of sensor emission when each swing circle first time of the first colour wheel detects described first area, and described detection light, through described first area, produces described first level skip signal.
Optionally, described first group of sensor comprises the first sending and receiving sensor, and described first sending and receiving sensor is used for emission detection light, and the light path of the detection light of described first sending and receiving sensor transmitting is vertical with the one side of described first colour wheel;
The reflected light that the detection light that sensor emission is penetrated in described first transmitting-receiving is formed when each swing circle first time of the first colour wheel detects described first area is received by described first sending and receiving sensor, produces described first level skip signal.
Optionally, described second group of sensor comprises the second emission sensor and the second receiving sensor, and described second emission sensor is positioned at the first surface of described second colour wheel, for emission detection light; Described second receiving sensor is positioned at second of described second colour wheel and is positioned in the light path of the detection light that described second emission sensor is launched;
The detection light that described second emission sensor is launched is when each swing circle first time of the second colour wheel detects described second area, described detection light passes described second area and is received by described second receiving sensor, produces described second electrical level skip signal.
Optionally, described second group of sensor comprises the second emission sensor and the second receiving sensor, and described second emission sensor is positioned at the first surface of described second colour wheel, for emission detection light; Described second receiving sensor is positioned at second of described second colour wheel and is positioned in the light path of the detection light that described second emission sensor is launched;
The detection light that described second emission sensor is launched is when each swing circle first time of the second colour wheel detects described second area, and the detection light that described second emission sensor is launched is reflected, and produces described second electrical level skip signal.
Optionally, described second group of sensor comprises the second sending and receiving sensor, and described second sending and receiving sensor is used for emission detection light, and the light path of the detection light of described second sending and receiving sensor transmitting is vertical with the one side of described second colour wheel;
Described second transmitting-receiving penetrates the detection light of sensor emission when each swing circle first time of the second colour wheel detects described second area, and described detection light, through described second area, produces described second electrical level skip signal.
Optionally, described second group of sensor comprises the second sending and receiving sensor, and described second sending and receiving sensor is used for emission detection light, and the light path of the detection light of described second sending and receiving sensor transmitting is vertical with the one side of described second colour wheel;
The reflected light that the detection light that described second sending and receiving sensor is launched is formed when each swing circle first time of the second colour wheel detects described second area is received by described second sending and receiving sensor, produces described second electrical level skip signal.
According to the method that the embodiment of the present invention provides, first group of sensor produces the first level skip signal when detecting the first area in the first colour wheel, second group of sensor produces second electrical level skip signal when detecting the second area in the second colour wheel, if determine that the mistiming between the first level skip signal and second electrical level skip signal is not threshold value, then can determine that the rotation between the first colour wheel and the second colour wheel is asynchronous, thus can according to the rotating speed of described mistiming described first colour wheel of adjustment and/or described second colour wheel, the mistiming making described first level skip signal and described second electrical level skip signal is described threshold value, thus make the rotation between the first colour wheel with the second colour wheel synchronous.The method that the embodiment of the present invention provides directly utilizes sensor to detect to the first and second colour wheel wheel face regions, do not need additionally to increase the mark of label as sensor identification, method is directly easy, reliability is high, improve and double-coloredly take turns synchronous efficiency, thus effectively can realize the accurate switching of each color of light, realize double-colored take turns precisely synchronous, do not produce mixed light or colour mixture time period.This is because, paste black light-absorbing adhesive tape to make marks in color wheel motor rotating shaft compared in prior art, the error that assembling reason can be avoided to cause, shortens the process of debugging, and there is not the risk that mark comes off and the problem causing product reliability low.Simultaneously, relative to the coaxial polychrome wheel synchronization scenario arranged, do not need to carry out rejecting the purity that the colour mixture time period ensures color, thus can improve the output brightness of light source, the image color configuration that whole laser projection system is exported is more accurate, saturation degree is higher.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly introduced, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 provides a kind of polychrome to take turns synchronous method schematic flow sheet for the embodiment of the present invention;
The one first colour wheel schematic diagram that Fig. 2 provides for the embodiment of the present invention;
The one second colour wheel schematic diagram that Fig. 3 provides for the embodiment of the present invention;
The corresponding relation schematic diagram of a kind of first colour wheel that Fig. 4 provides for the embodiment of the present invention and the second colour wheel;
The another kind first colour wheel schematic diagram that Fig. 5 provides for the embodiment of the present invention;
The another kind second colour wheel schematic diagram that Fig. 6 provides for the embodiment of the present invention;
The corresponding relation schematic diagram of another kind first colour wheel that Fig. 7 provides for the embodiment of the present invention and the second colour wheel;
A kind of level skip signal schematic diagram that Fig. 8 provides for the embodiment of the present invention;
A kind of level skip signal schematic diagram that Fig. 9 provides for the embodiment of the present invention;
A kind of level skip signal schematic diagram that Figure 10 provides for the embodiment of the present invention;
A kind of level skip signal schematic diagram that Figure 11 provides for the embodiment of the present invention;
A kind of level skip signal schematic diagram that Figure 12 provides for the embodiment of the present invention;
A kind of level skip signal schematic diagram that Figure 13 provides for the embodiment of the present invention;
A kind of level skip signal schematic diagram that Figure 14 provides for the embodiment of the present invention;
A kind of level skip signal schematic diagram that Figure 15 provides for the embodiment of the present invention;
A kind of laser projection device structural representation that Figure 16 provides for the embodiment of the present invention.
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, and obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of colour wheel synchronous method of LASER Light Source can be applied in the projection arrangements such as projector.
As shown in Figure 1, for the embodiment of the present invention provides a kind of polychrome to take turns synchronous method schematic flow sheet.
See Fig. 1, the method comprises:
Step 101: detected the first area in the wheel face of the first colour wheel by first group of sensor, and produce the first level skip signal when each swing circle first time of the first colour wheel detects described first area; Detected the second area in the wheel face of the second colour wheel by second group of sensor, and produce second electrical level skip signal when each swing circle first time of the second colour wheel detects described second area;
Step 102: whether the mistiming judging described first level skip signal and described second electrical level skip signal is threshold value, if not, then adjust the rotating speed of described first colour wheel and/or described second colour wheel, the mistiming making described first level skip signal and described second electrical level skip signal is described threshold value.
In step 101, the laser that LASER Light Source is launched can be converted to the light of different wave length by the first colour wheel, and the light after conversion enters in the light path of the second colour wheel.First colour wheel is arranged on the laser optical path that stimulated luminescence source sends, and the first colour wheel Stimulated Light excites, change and transmission laser.Second colour wheel is corresponding with the first colour wheel, and same color central angle size is identical, to be filtered by the light of the first colour wheel conversion, to improve the excitation of the light of the first colour wheel conversion.Second colour wheel is generally positioned at the light emission side of the first colour wheel stimulated luminescence and is intervally arranged with the first colour wheel.
In the embodiment of the present invention, the first colour wheel can be taken turns for fluorescent powder.When first colour wheel is fluorescent powder wheel, it can be the wheel disc comprising fluorescent powder district, aluminium base district, transparent region.Aluminium base district on fluorescent powder wheel is the region of uncoated fluorescent powder, and the surface in aluminium base district is minute surface, can reflective infrared detection light or ultraviolet detection light.Fluorescent powder wheel on transparent region be laser-transmitting district, can transmission laser light source launch laser.Fluorescent powder district is arranged along the excircle in the aluminium base district in fluorescent powder wheel.When fluorescent powder wheel rotates, laser gets to fluorescent powder district and transparent region successively, and such laser can from transparent region outgoing, correspondingly, take turns first group of corresponding sensor with fluorescent powder and be not radiated at same position with laser, but be radiated at the diverse location of regional transmission.
Second colour wheel can be filter wheel.When second colour wheel is filter wheel, it can be the wheel disc comprising transparent region, filtered region (can comprise in green glow filtered region, ruddiness filtered region, blue light filtered region one or more).Wherein, transparent region is laser-transmitting district.Green glow filtered region is only through green glow, and the light of other colors all reflects; Ruddiness filtered region is only through ruddiness, and the light of other colors all reflects; Blue light filtered region is transparent region, only through blue light.Optionally, the filtered region in the second colour wheel covers one deck reflecting coating, can reflective sensor launch detection light.
Simultaneously, in the embodiment of the present invention, first area can be the transparent region in the first colour wheel, make the detection light of described first group of sensor emission when each swing circle first time of the first colour wheel detects described first area, the detection light of described first group of sensor emission passes described first area and is received by described first group of sensor, produces described first level skip signal.Transparent region in first colour wheel can be made up of clear glass, or is made up of transparent diffuser panel material.
Accordingly, second area can be the transparent region in the second colour wheel, make the detection light of described second group of sensor emission when each swing circle first time of the second colour wheel detects described second area, the detection light of described second group of sensor emission passes described second area and is received by described second group of sensor, produces described second electrical level skip signal.Same, the transparent region in the second colour wheel can be made up of clear glass, or is made up of transparent diffuser panel material.
For example, the laser that LASER Light Source is launched is blue laser, and the first colour wheel is fluorescent powder wheel, and now fluorescent powder wheel can be device as shown in Figure 2.As shown in Figure 2, be one first colour wheel schematic diagram that the embodiment of the present invention provides.In Fig. 2,31 represent transparent region, are laser-transmitting district; Fluorescent powder district is distributed in the excircle in aluminium base district 32.Yellow fluorescent powder district 321 and green emitting phosphor district 322 can be comprised in fluorescent powder district.The laser refiltering LASER Light Source transmitting from yellow fluorescent powder district 321 can obtain red fluorescence, and (red efficiency inspired because of current red fluorescence material is lower, the conversion of ruddiness excites yellow fluorescent material to send gold-tinted by blue laser, colour wheel filtering obtains ruddiness after filtration again, therefore yellow fluorescent powder district 321 can regard ruddiness transition zone as), the laser refiltering LASER Light Source transmitting from green emitting phosphor district 322 can obtain green fluorescence.Can certainly be the situation that two-color laser (being generally blue and red laser) excites a kind of fluorescent powder (green emitting phosphor), final formation three primary colours light.
Composition graphs 2 as shown in Figure 3, is the one second colour wheel schematic diagram that the embodiment of the present invention provides.In Fig. 3, the second colour wheel is filter wheel.Filter wheel in Fig. 3 can be take turns corresponding filter wheel with the fluorescent powder in Fig. 2.Filter wheel is generally sector structure and is spliced to form.In Fig. 3,41 can represent transparent region, are laser-transmitting district; 42 can represent green glow filtered region; 43 can represent ruddiness filtered region.
Composition graphs 2 and Fig. 3, as shown in Figure 4, a kind of first colour wheel provided for the embodiment of the present invention and the corresponding relation schematic diagram of the second colour wheel.The corresponding relation in each region in each region in the fluorescent powder wheel in Fig. 2 and the filter wheel in Fig. 3 has been shown in Fig. 4.When a part of yellow fluorescence not considering in Tu2Zhong yellow fluorescent powder district 321 is retained formation four primary, the fluorescent powder wheel in Fig. 2 should align under synchronous regime with the female middle color partition boundaries line of the colour filter in Fig. 3.Namely the transparent region 31 in Fig. 2 is corresponding with the transparent region 41 in Fig. 3 to be arranged, yellow fluorescent powder district 321 in Fig. 2 is arranged with the ruddiness filtered region 43 in Fig. 3 is corresponding, green emitting phosphor district 322 in Fig. 2 is corresponding with the green glow filtered region 42 in Fig. 3 to be arranged, thus make the fluorescent powder district of the filter area of same color and same color just right, the three primary colours monochromatic light that the whole light-source system of guarantee exports, without the situation of mixed light, to improve the excitation outputting to three primary colours light in ray machine optical projection system.
For example, as shown in Figure 5, be another kind first colour wheel schematic diagram that the embodiment of the present invention provides.The first colour wheel in Fig. 5 is fluorescent powder wheel.In fluorescent powder wheel in Fig. 5, transparent region 51 can for be made up of two regions, place of symmetry.Accordingly, 52 represent aluminium base district.Yellow fluorescent powder district 521 and green emitting phosphor district 522 can be comprised in fluorescent powder district.Yellow fluorescent powder district 521 can for be made up of two regions, place of symmetry; Green emitting phosphor district 522 can for be made up of two regions, place of symmetry.And concerning first group of sensor, two the first level skip signal may will be formed, only determine one of them first level skip signal.
Composition graphs 5 as shown in Figure 6, is the another kind second colour wheel schematic diagram that the embodiment of the present invention provides.In Fig. 6, the second colour wheel is filter wheel.Filter wheel in Fig. 6 can be take turns corresponding filter wheel with the fluorescent powder in Fig. 5.In Fig. 6,61 can represent transparent region, are made up of two regions, place of symmetry; 62 can represent green glow filtered region, are made up of two regions, place of symmetry; 63 can represent ruddiness filtered region, are made up of two regions, place of symmetry.And concerning second group of sensor, two second electrical level skip signal may will be formed, only determine one of them second electrical level skip signal.
Composition graphs 5 and Fig. 6, as shown in Figure 7, another kind first colour wheel provided for the embodiment of the present invention and the corresponding relation schematic diagram of the second colour wheel.The corresponding relation in each region in each region in the fluorescent powder wheel in Fig. 5 and the filter wheel in Fig. 6 has been shown in Fig. 7.Specifically can description in reference diagram 5 and Fig. 6, do not repeat them here.
It should be noted that, Fig. 2 to Fig. 7 is an example in the embodiment of the present invention.If the laser that LASER Light Source is launched is the laser of other colors, the first colour wheel also needs corresponding change to the formation of the second colour wheel, does not repeat them here.
It should be noted that, in the embodiment of the present invention, can there is multiple monochromatic laser light source, in order to obtain all the other two primary lights, then each LASER Light Source needs first colour wheel to change.Meanwhile, multiple first colour wheels of whole laser source system all need and a second colour wheel synchronous rotary.For example, can have N number of blue laser light source in the embodiment of the present invention, corresponding N number of fluorescent powder wheel, this N number of fluorescent powder wheel and a filter wheel all need synchronous rotary simultaneously, thus obtain the three primary colours light required for laser projection system, and N is positive integer.
In the embodiment of the present invention, the first area in the first colour wheel can be the region corresponding with the second area in the second colour wheel, also can be the region corresponding with the region except region corresponding with the second area in the second colour wheel in the first colour wheel.
For example, second area is the transparent region in the second colour wheel.Now, first area can be the transparent region in the first colour wheel, namely corresponding with the transparent region in the second colour wheel region.First area can also be all regions in the first colour wheel except transparent region.Composition graphs 2, now first area can be aluminium base district 32.
Accordingly, the second area in the second colour wheel can be the region corresponding with the first area in the first colour wheel, also can be the region corresponding with the region except region corresponding with the first area in the first colour wheel in the second colour wheel.
For example, first area is the transparent region in the first colour wheel.Now, second area can be the transparent region in the second colour wheel, namely corresponding with the transparent region in the first colour wheel region.Second area can also be all regions in the second colour wheel except transparent region.Composition graphs 3, now second area can be the region that green glow filtered region 42 is combined with ruddiness filtered region 43.
In sum, in the embodiment of the present invention, first area and second area can have following four kinds of array configurations:
1, first area is the transparent region in the first colour wheel; Second area is the transparent region in the second colour wheel.
2, first area is the transparent region in the first colour wheel; Second area is all regions in the second colour wheel except transparent region, i.e. filtered region.
3, first area is the aluminium base district of uncoated fluorescent powder in the first colour wheel; Second area is the transparent region in the second colour wheel.
4, first area is the aluminium base district of uncoated fluorescent powder in the first colour wheel; Second area is all regions in the second colour wheel except transparent region, i.e. filtered region.
It should be noted that, if first area is the transparent region in the first colour wheel, the detection light of first group of sensor emission may be made when each swing circle first time of the first colour wheel detects described first area, the detection light of described first group of sensor emission passes described first area and is received by described first group of sensor, produces described first level skip signal.If first area is the aluminium base district in the first colour wheel, the detection light of described first group of sensor emission may be made when each swing circle first time of the first colour wheel detects described first area, the detection light of described first group of sensor emission is reflected by described first area and is received by described first group of sensor, produces described first level skip signal.
If second area is the transparent region in the second colour wheel, the detection light of second group of sensor emission may be made when each swing circle first time of the second colour wheel detects described second area, the detection light of described second group of sensor emission passes described second area and is received by described second group of sensor, produces described second electrical level skip signal.If second area is the filtered region covering one deck reflecting coating in described second colour wheel, the detection light of described second group of sensor emission may be made when each swing circle first time of the second colour wheel detects described second area, the detection light of described second group of sensor emission is reflected by described second area and is received by described second group of sensor, produces described second electrical level skip signal.
Optionally, all regions in the second colour wheel except transparent region can for covering the region of one deck reflecting coating.Reflecting coating is used for the detection light that reflective sensor (can be first group of sensor or second group of sensor) is launched.Such as, the detection light of first group of sensor or second group of sensor emission is ultraviolet light, so all regions in the second colour wheel except transparent region can cover the reflecting coating of one deck light reflection ultraviolet, thus the ultraviolet light of first group of sensor or second group of sensor emission can be reflected.Again such as, the detection light of first group of sensor or second group of sensor emission is infrared light, so all regions in the second colour wheel except transparent region can cover the reflecting coating of one deck reflects infrared light, thus the infrared light of first group of sensor or second group of sensor emission can be reflected.
For example, composition graphs 3, green glow filtered region 43 and ruddiness filtered region 42 can cover reflecting coating, may be used for the detection light that reflection second sensor group is launched.Wherein, reflecting coating can be thus can be the reflecting coating of reflects infrared light, also can be the reflecting coating of light reflection ultraviolet.
For convenience, in the embodiment of the present invention, all regions in described first colour wheel except described first area are referred to as the 3rd region, meanwhile, when first group of sensor detects described 3rd region.Produce three level signal; All regions in described second colour wheel except described second area are referred to as the 4th region, meanwhile, when second group of sensor detects described 4th region, produce the 4th level signal.
In the embodiment of the present invention, first group of sensor can be the one group of sensor comprising the first emission sensor and the first receiving sensor, and wherein, described first emission sensor is positioned at the first surface of described first colour wheel, for emission detection light; Described first receiving sensor is positioned at second of described first colour wheel and is positioned in the light path of the detection light that described first emission sensor is launched.Wherein, the detection light that the first emission sensor is launched can be ultraviolet light or infrared light.
Described first group of sensor can also be the one group of sensor comprising the first sending and receiving sensor, and wherein, described first sending and receiving sensor is used for emission detection light, and the light path of the detection light of described first sending and receiving sensor transmitting is vertical with the one side of described first colour wheel.Wherein, the detection light that the first sending and receiving sensor is launched can be ultraviolet light or infrared light.
Accordingly, described second group of sensor can be the one group of sensor comprising the second emission sensor and the second receiving sensor, and wherein, described second emission sensor is positioned at the first surface of described second colour wheel, for emission detection light; Described second receiving sensor is positioned at second of described second colour wheel and is positioned in the light path of the detection light that described second emission sensor is launched.Wherein, the detection light that the second emission sensor is launched can be ultraviolet light or infrared light.
Described second group of sensor can also be the one group of sensor comprising the second sending and receiving sensor, and wherein, described second sending and receiving sensor is used for emission detection light, and the light path of the detection light of described second sending and receiving sensor transmitting is vertical with the one side of described first colour wheel.Wherein, the detection light that the second sending and receiving sensor is launched can be ultraviolet light or infrared light.
In the embodiment of the present invention, when first group of sensor detects the first area in the first colour wheel, high level signal can be produced, the 3rd region detected in the first colour wheel time can produce low level signal; Or, low level signal can be produced when first group of sensor detects the first area in the first colour wheel, the 3rd region detected in the first colour wheel time can produce high level signal.Different from the level signal that the 3rd region produces owing to detecting first area, thus twice level skip signal (being respectively rising edge skip signal and negative edge skip signal) can be produced in each swing circle of the first colour wheel, thus can using one of them level skip signal as the first level skip signal.
Accordingly, high level signal can be produced when second group of sensor detects in the second colour wheel second area, the 4th region detected in the second colour wheel time can produce low level signal; Or, low level signal can be produced when second group of sensor detects the second area in the second colour wheel, the 4th region detected in the second colour wheel time can produce high level signal.Different from the level signal that the 4th region produces owing to detecting second area, thus twice level skip signal (being respectively rising edge skip signal and negative edge skip signal) can be produced in each swing circle of optical filtering conversion equipment, thus can using one of them level skip signal as the first level skip signal.
In conjunction with description above, the following describes and specifically how to produce the first level skip signal and second electrical level skip signal.
The generation of the first level skip signal can have following several mode:
Mode one:
First group of sensor be comprise the first emission sensor and one group of sensor of the first receiving sensor, described first area is when being the transparent region in the first colour wheel, described first receiving sensor can produce described first level skip signal when each swing circle first time of the first colour wheel receives the detection light that described first emission sensor launches.
When now the detection photodetection of described first emission sensor transmitting is to described first area, described detection light can pass described first area and be received by described first receiving sensor, thus produces described first level skip signal when each swing circle first time of the first colour wheel detects described first area.Optionally, the detection light that described first emission sensor is launched is when each swing circle first time of the first colour wheel detects all regions (being referred to as the 3rd region in the embodiment of the present invention) in described first colour wheel except described first area, described detection light cannot pass the 3rd region, therefore described first receiving sensor cannot receive the detection light that described first emission sensor is launched, thus can produce three level skip signal when each swing circle first time of the first colour wheel detects described 3rd region.
Mode two:
First group of sensor is when to comprise the first emission sensor and one group of sensor of the first receiving sensor, described first area be the aluminium base district of uncoated fluorescent powder in the first colour wheel, and described first receiving sensor can produce described first level skip signal when each swing circle first time of the first colour wheel does not receive the detection light that described first emission sensor launches.When now the detection photodetection of described first emission sensor transmitting is to described first area, described detection light cannot pass described first area, thus described first receiving sensor cannot receive the detection light that described first emission sensor is launched, thus produce described first level skip signal when each swing circle first time of the first colour wheel detects described first area.Optionally, the detection light that described first emission sensor is launched is when each swing circle first time of the first colour wheel detects described 3rd region, due to the transparent region that described 3rd region is in the first colour wheel, described detection light can pass described 3rd region, therefore described first receiving sensor can receive the detection light that described first emission sensor is launched, thus can produce three level skip signal when each swing circle first time of the first colour wheel detects described 3rd region.
Mode three:
First group of sensor be comprise one group of sensor of the first sending and receiving sensor, described first area is when being the transparent region in the first colour wheel, described first sending and receiving sensor produces described first level skip signal when each swing circle first time of the first colour wheel does not receive the reflected light of the detection light that described first sending and receiving sensor is launched.
When now the detection photodetection of described first sending and receiving sensor transmitting is to described first area, the detection light that described first sending and receiving sensor is launched can pass described first area, described first sending and receiving sensor thus the reflected light of detection light that described first sending and receiving sensor launches can not be received, thus produce described first level skip signal when each swing circle first time of the first colour wheel detects described first area.Accordingly, the detection light that described first sending and receiving sensor is launched is when each swing circle first time of the first colour wheel detects described 3rd region, the detection light that described first sending and receiving sensor is launched can be capped the aluminium base regional reflex of layer of fluorescent powder, described first sending and receiving sensor thus the reflected light of detection light that described first sending and receiving sensor launches can be received, thus produce described three level skip signal when each swing circle first time of the first colour wheel detects described 3rd region.
Mode four:
First group of sensor be comprise one group of sensor of the first sending and receiving sensor, aluminium base district that described first area is uncoated fluorescent powder in the first colour wheel time, described first sending and receiving sensor produces described first level skip signal when each swing circle first time of the first colour wheel receives the reflected light of the detection light that described first sending and receiving sensor is launched.
When now the detection photodetection of described first sending and receiving sensor transmitting is to described first area, the detection light that described first sending and receiving sensor is launched can be capped the aluminium base regional reflex of layer of fluorescent powder, described first sending and receiving sensor thus the reflected light of detection light that described first sending and receiving sensor launches can be received, thus produce described first level skip signal when each swing circle first time of the first colour wheel detects described first area.Accordingly, the detection light that described first sending and receiving sensor is launched is when each swing circle first time of the first colour wheel detects the 3rd region, due to the transparent region that described 3rd region is in the first colour wheel, the detection light that described first sending and receiving sensor is launched can pass described 3rd region, described first sending and receiving sensor thus the reflected light of detection light that described first sending and receiving sensor launches can not be received, thus produce described three level skip signal when each swing circle first time of the first colour wheel detects described 3rd region.
Accordingly, the generation of second electrical level skip signal can have following several mode:
Mode one:
Second group of sensor be comprise the second emission sensor and one group of sensor of the second receiving sensor, described second area is when being the transparent region in the second colour wheel, described second receiving sensor can produce described second electrical level skip signal when each swing circle first time of the second colour wheel receives the detection light that described second emission sensor launches.When now the detection photodetection of described second emission sensor transmitting is to described second area, described detection light can pass described second area and be received by described second receiving sensor, thus produces described second electrical level skip signal when each swing circle first time of the second colour wheel detects described second area.Optionally, the detection light that described second emission sensor is launched is when each swing circle first time of the second colour wheel detects the 4th region covering one deck reflecting coating in described second colour wheel, described detection light cannot pass the 4th region, therefore described second receiving sensor cannot receive the detection light that described second emission sensor is launched, thus can produce the 4th level skip signal.
Mode two:
Second group of sensor be comprise the second emission sensor and one group of sensor of the second receiving sensor, described second area is when being all regions in the second colour wheel except transparent region, described second receiving sensor can produce described second electrical level skip signal when each swing circle first time of the second colour wheel does not receive the detection light that described second emission sensor launches.Wherein, described second area covers one deck reflecting coating.
When now the detection photodetection of described second emission sensor transmitting is to described second area, described detection light cannot pass described second area, thus described second receiving sensor cannot receive the detection light that described second emission sensor is launched, thus produce described second electrical level skip signal when each swing circle first time of the second colour wheel detects described second area.Optionally, the detection light that described second emission sensor is launched is when each swing circle first time of the second colour wheel detects the 4th region, due to the transparent region that described 4th region is in the second colour wheel, described detection light can pass the 4th region, therefore described second receiving sensor can receive the detection light that described second emission sensor is launched, thus can produce the 4th level skip signal.
Mode three:
Second group of sensor be comprise one group of sensor of the second sending and receiving sensor, described second area is when being the transparent region in the second colour wheel, described second sending and receiving sensor produces described second electrical level skip signal when each swing circle first time of the second colour wheel does not receive the reflected light of the detection light that described second sending and receiving sensor is launched.
When now the detection photodetection of described second sending and receiving sensor transmitting is to described second area, the detection light that described second sending and receiving sensor is launched can pass described second area, described second sending and receiving sensor thus the reflected light of detection light that described second sending and receiving sensor launches can not be received, thus produce described second electrical level skip signal when each swing circle first time of the second colour wheel detects described second area.Accordingly, the 4th region in second colour wheel is the region covering one deck reflecting coating, the detection light that described second sending and receiving sensor is launched is when each swing circle first time of the second colour wheel detects described 4th region, the detection light that described second sending and receiving sensor is launched can by the 4th regional reflex, described second sending and receiving sensor thus the reflected light of detection light that described second sending and receiving sensor launches can be received, thus produce described 4th level skip signal.
Mode four:
Second group of sensor be comprise one group of sensor of the second sending and receiving sensor, described second area is when being all regions in the second colour wheel except transparent region, described second sending and receiving sensor produces described second electrical level skip signal when each swing circle first time of the second colour wheel receives the reflected light of the detection light that described second sending and receiving sensor is launched.Wherein, described second area covers one deck reflecting coating.
When now the detection photodetection of described second sending and receiving sensor transmitting is to described second area, one deck reflecting coating that the detection light that described second sending and receiving sensor is launched can be covered by second area reflects, described second sending and receiving sensor thus the reflected light of detection light that described second sending and receiving sensor launches can be received, thus produce described second electrical level skip signal when each swing circle first time of the second colour wheel detects described second area.Accordingly, the detection light that described second sending and receiving sensor is launched is when each swing circle first time of the second colour wheel detects the 4th region, because described 4th region is transparent region, the detection light that described second sending and receiving sensor is launched can pass described 4th region, described second sending and receiving sensor thus the reflected light of detection light that described second sending and receiving sensor launches can not be received, thus produce described 4th level skip signal.
It should be noted that, in the embodiment of the present invention, the swing circle of the first colour wheel is equal with the swing circle of the second colour wheel, when the first colour wheel is identical with the sense of rotation of filter, the corresponding region fan angle of often kind of color is identical, and each color sequential during rotating Vortex is identical.
The transparent region of the first colour wheel is blue light bright dipping region, and all the other two parts are respectively ruddiness transition region and green glow transition region, and the transparent region in the first colour wheel is identical with the center of circle angle of the transparent region in the second colour wheel; Ruddiness transition region in first colour wheel is identical with the center of circle angle of the ruddiness filtered region in the second colour wheel; Green glow transition region in first colour wheel is identical with the center of circle angle of the green glow filtered region in the second colour wheel; And the first colour wheel is identical with the distributing order of color corresponding region each in the second colour wheel, therefore only need transparent region and blue region synchronous, then red light region and green wavelength will be corresponding synchronous.Monochromatic laser light source system only can comprise a light source module also can comprise N number of light source module, namely the fluorescent wheel that monochromatic source system is corresponding will have one or N number of, comprise the filter wheel in the light path of rear end, whole monochromatic source system then has two or N+1 colour wheel, for ensureing monochromatic light (the such as red light that whole laser source system output purity is very high, green light or blue light), need the colour wheel of the N+1 in whole optical projection system all precisely synchronous, non-mixed color between the monochromatic light that laser source system just can be made to export, also the efficiency of whole optical projection system light is made greatly to improve.
In step 102, if the mistiming judging described first level skip signal and described second electrical level skip signal is not threshold value, then need the rotating speed adjusting described first colour wheel and/or described second colour wheel, the mistiming making described first level skip signal and described second electrical level skip signal is described threshold value.
In the embodiment of the present invention, first level skip signal, second electrical level skip signal, three level skip signal and the 4th level skip signal can be rising edge skip signal respectively, also can be negative edge skip signal, the embodiment of the present invention limit this.
In the embodiment of the present invention, the first colour wheel and the design of the second colour wheel can be rotate according to identical sense of rotation, and such as, the first colour wheel and the second colour wheel can all turn clockwise, and also can all be rotated counterclockwise.Below the first colour wheel and the equidirectional example that rotates to be of the second colour wheel are described.
Be described according to different situations below:
Before described, the duration of the first level signal and the duration of second electrical level signal is first defined.The duration of the first level signal is in a swing circle of the first colour wheel, and the detection photodetection of first group of sensor emission is to the duration of the transparent region in the first colour wheel; Or the duration of the first level signal is in a swing circle of color filtering mean, the detection photodetection of second group of sensor emission is to the duration of the transparent region in color filtering mean.
For example, the detection photodetection taking turns corresponding sensor emission with fluorescent powder is the duration of the first level signal to duration of transparent region; Or the detection photodetection of the sensor emission corresponding with filter wheel is the duration of the first level signal to duration of transparent region.
The duration of second electrical level signal is in a swing circle of the first colour wheel, and the detection photodetection of first group of sensor emission is to the duration in the fluorescent powder district in the first colour wheel; Or the duration of second electrical level signal is in a swing circle of the second colour wheel, the detection photodetection of second group of sensor emission is to the duration in the colour filter region in the second colour wheel.
For example, the detection photodetection taking turns corresponding sensor emission with fluorescent powder is the duration of second electrical level signal to duration in fluorescent powder district; Or the detection photodetection of the sensor emission corresponding with filter wheel is the duration of second electrical level signal to duration of filtered region.
Meanwhile, in often kind of situation described below, when producing high level signal, the fluorescent powder district detected in the first colour wheel when being all the transparent regions detected with first group of sensor in the first colour wheel, produce low level signal; And second group of sensor to produce low level signal when producing high level signal, the filtered region detected in the second colour wheel when detecting in the second colour wheel transparent region be that example is described, other situations with reference to description below, no longer can repeat at this.
The first situation:
First colour wheel rotates according to identical sense of rotation with the second colour wheel.If first area is the transparent region in the first colour wheel; Second area is the transparent region in the second colour wheel.First group of sensor produces low level signal when producing high level signal, the 3rd region detected in the first colour wheel when detecting the first area in the first colour wheel.Second group of sensor produces low level signal when producing high level signal, the 4th region detected in the second colour wheel when detecting the second area in the second colour wheel.First level skip signal is rising edge skip signal, second electrical level skip signal is rising edge skip signal.The the first level skip signal now detected and the mistiming of second electrical level skip signal can be 0.
For example, as shown in Figure 8, be a kind of level skip signal schematic diagram that the embodiment of the present invention provides.In Fig. 8, the first level skip signal that rising edge skip signal 401 produces for detecting the first area in the first colour wheel in each swing circle first time of the first colour wheel, the second electrical level skip signal that rising edge skip signal 402 produces for detecting the second area in the second colour wheel in each swing circle first time of the second colour wheel.If detecting the mistiming between rising edge skip signal 401 and rising edge skip signal 402 is not 0, then can determine that the rotation of the first colour wheel and the second colour wheel is asynchronous, need to regulate.
For example, the first colour wheel is fluorescent powder wheel, and the second colour wheel is filter wheel.Fluorescent powder wheel rotates according to identical sense of rotation with filter wheel.Take turns first group of corresponding sensor when each swing circle first time that fluorescent powder is taken turns detects the transparent region that fluorescent powder take turns with fluorescent powder, produce corresponding to the rising edge skip signal 401 in Fig. 9; The second group sensor corresponding with filter wheel, when each swing circle first time of filter wheel detects the transparent region of filter wheel, produces the rising edge skip signal 402 corresponded in Fig. 9.Due to fluorescent powder wheel and the rotating according to identical sense of rotation of filter wheel, now in a swing circle, mistiming between rising edge skip signal 401 and rising edge skip signal 402 should be 0, if determine, the mistiming between rising edge skip signal 401 and rising edge skip signal 402 is △ T1, wherein △ T1 is greater than 0, then need to regulate the rotational speed of fluorescent powder wheel and/or filter wheel, make the mistiming between rising edge skip signal 401 and rising edge skip signal 402 be 0, thus the rotation realizing fluorescent powder wheel and filter wheel is synchronous.
The second situation:
First colour wheel rotates according to identical sense of rotation with the second colour wheel.If first area is the transparent region in the first colour wheel; Second area is all regions in the second colour wheel except transparent region, and second area is the region covering one deck reflecting coating, i.e. filtered region.First group of sensor produces low level signal when producing high level signal, the 3rd region detected in the first colour wheel when detecting the first area in the first colour wheel.Second group of sensor produces high level signal when producing low level signal, the 4th region detected in the second colour wheel when detecting the second area in the second colour wheel.First level skip signal is rising edge skip signal, second electrical level skip signal is negative edge skip signal.Now, in a swing circle, look with the transmitting terminal of the sensor of emission detection light, if when the first colour wheel and the second colour wheel are all rotated counterclockwise, the first level skip signal detected and the mistiming of second electrical level skip signal can be the duration of second electrical level signal; In a swing circle, look with the transmitting terminal of the sensor of emission detection light, if when the first colour wheel and the second colour wheel all turn clockwise, the first level skip signal detected and the mistiming of second electrical level skip signal can be the duration of second electrical level signal.
For example, the first colour wheel is fluorescent powder wheel, and the second colour wheel is filter wheel.Look with the transmitting terminal of the sensor of emission detection light, if fluorescent powder wheel is all rotated counterclockwise with filter wheel.As shown in Figure 10, be a kind of level skip signal schematic diagram that the embodiment of the present invention provides.In Figure 10, with fluorescent powder take turns first group of corresponding sensor each swing circle first time that fluorescent powder is taken turns detect fluorescent powder take turns in transparent region time the first level skip signal of producing be rising edge skip signal 601, the second electrical level skip signal produced first group of sensor corresponding with filter wheel detects the colour filter region in filter wheel for the first time during at each swing circle of filter wheel is negative edge skip signal 602.Rising edge skip signal 601 and the mistiming of negative edge skip signal 602 in a swing circle are duration of second electrical level signal, and namely the detection photodetection of first group of sensor emission is to duration in the fluorescent powder district in fluorescent powder.If detecting the mistiming between rising edge skip signal 601 and negative edge skip signal 602 is not the duration of second electrical level signal, then can determine that fluorescent powder wheel is asynchronous with the rotation of filter wheel, need to regulate.Concrete, in conjunction with Figure 10, as shown in figure 11, be a kind of level skip signal schematic diagram that the embodiment of the present invention provides.In Figure 11, between rising edge skip signal 601 and negative edge skip signal 602, the mistiming is △ T2, and wherein △ T2 is less than the duration of second electrical level signal.Now need to regulate the rotational speed of fluorescent powder wheel and/or filter wheel, make the mistiming between rising edge skip signal 601 and negative edge skip signal 602 be the duration of second electrical level signal, thus it is synchronous with the rotation of filter wheel to realize fluorescent powder wheel.
The third situation:
First colour wheel rotates according to identical sense of rotation with the second colour wheel.If first area is the aluminium base district of uncoated fluorescent powder in the first colour wheel; Second area is the transparent region in the second colour wheel.First group of sensor produces high level signal when producing low level signal, the 3rd region detected in the first colour wheel when detecting the first area in the first colour wheel.Second group of sensor produces low level signal when producing high level signal, the 4th region detected in the second colour wheel when detecting the second area in the second colour wheel.First level skip signal is negative edge skip signal, second electrical level skip signal is rising edge skip signal.Now, in a swing circle, look with the transmitting terminal of the sensor of emission detection light, if when the first colour wheel and the second colour wheel are all rotated counterclockwise, the first level skip signal detected and the mistiming of second electrical level skip signal can be duration of the first level signal; In a swing circle, look with the transmitting terminal of the sensor of emission detection light, if when the first colour wheel and the second colour wheel all turn clockwise, the first level skip signal detected and the mistiming of second electrical level skip signal can be duration of the first level signal.
For example, the first colour wheel is fluorescent powder wheel, and the second colour wheel is filter wheel.Look with the transmitting terminal of the sensor of emission detection light, if fluorescent powder wheel is all rotated counterclockwise with filter wheel.As shown in figure 12, be a kind of level skip signal schematic diagram that the embodiment of the present invention provides.In Figure 12, negative edge skip signal 801 be take turns with fluorescent powder first group of corresponding sensor each swing circle first time that fluorescent powder is taken turns detect fluorescent powder take turns in the first level skip signal of producing of fluorescent powder district, rising edge skip signal 802 is the second group sensor corresponding with filter wheel detects the transparent region generation in filter wheel for the first time second electrical level skip signal at each swing circle of filter wheel.
The duration that mistiming between negative edge skip signal 801 and rising edge skip signal 802 is not the first level signal if detect, then can determine that fluorescent powder wheel is asynchronous with the rotation of filter wheel, need to regulate.Concrete, in conjunction with Figure 12, as shown in figure 13, be a kind of level skip signal schematic diagram that the embodiment of the present invention provides.In Figure 13, between negative edge skip signal 801 and rising edge skip signal 802, the mistiming is △ T3, and wherein △ T3 is less than the duration of the first level signal.Now need to regulate the rotational speed of fluorescent powder wheel and/or filter wheel, make the mistiming between negative edge skip signal 801 and rising edge skip signal 802 be the duration of the first level signal, thus it is synchronous with the rotation of filter wheel to realize fluorescent powder wheel.
4th kind of situation:
First colour wheel rotates according to identical sense of rotation with the second colour wheel.If first area is the aluminium base district of uncoated fluorescent powder in the first colour wheel; Second area is all regions in the second colour wheel except transparent region, and second area is the region covering one deck reflecting coating, i.e. filtered region.First group of sensor produces high level signal when producing low level signal, the 3rd region detected in the first colour wheel when detecting the first area in the first colour wheel.Second group of sensor produces high level signal when producing low level signal, the 4th region detected in the second colour wheel when detecting the second area in the second colour wheel.First level skip signal is negative edge skip signal, second electrical level skip signal is negative edge skip signal.The the first level skip signal now detected and the mistiming of second electrical level skip signal can be 0.
For example, the first colour wheel is fluorescent powder wheel, and the second colour wheel is filter wheel.As shown in figure 14, be a kind of level skip signal schematic diagram that the embodiment of the present invention provides.In Figure 14, negative edge skip signal 1001 be take turns with fluorescent powder first group of corresponding sensor each swing circle first time that fluorescent powder is taken turns detect fluorescent powder take turns in the first level skip signal of producing of fluorescent powder district, negative edge skip signal 1002 is the second group sensor corresponding with filter wheel detects the filtered region generation in filter wheel for the first time second electrical level skip signal at each swing circle of filter wheel.
If detecting the mistiming between negative edge skip signal 1001 and negative edge skip signal 1002 is not 0, then can determine that fluorescent powder wheel is asynchronous with the rotation of filter wheel, need to regulate.Concrete, in conjunction with Figure 14, as shown in figure 15, be a kind of level skip signal schematic diagram that the embodiment of the present invention provides.In Figure 15, between negative edge skip signal 1001 and negative edge skip signal 1002, the mistiming is △ T4, and wherein △ T4 is greater than 0.Now need to regulate the rotational speed of fluorescent powder wheel and/or filter wheel, make the mistiming between negative edge skip signal 1001 and negative edge skip signal 1002 be 0, thus it is synchronous with the rotation of filter wheel to realize wavelength fluorescent powder wheel.
It should be noted that, if there is multiple first colour wheel, then need to carry out carrying out synchronous with above-described synchronous method to each first colour wheel, thus make each first colour wheel rotate synchronous with the second colour wheel.
In such scheme, detected the first colour wheel wheel face region and the second colour wheel wheel face region by sensor, do not need additionally to increase the mark of label as sensor identification, method is directly easy, and reliability is high, improves double-coloredly to take turns synchronous efficiency.Owing to being utilize the structure of the first colour wheel and the second color wheel device itself to form reflection and transmission to the detection signal of sensor, thus obtain the first level skip signal and second electrical level skip signal.The level saltus step situation of the first level skip signal and second electrical level skip signal can reflect the distribution of the first colour wheel and the signal reflex district of the second colour wheel own and signal transmission area.If the first colour wheel is fluorescent wheel, then can reflect that the laser color of transmission area in fluorescent wheel and the switching of phosphor region color are demarcated, namely from fluorescence color subregion to laser color subregion or from laser color subregion to the change of fluorescence color subregion, do not exist because MARK tag block paste position and color zone boundary position are departed from, and cause the level skip signal formed according to MARK tag block to there is to the feedback that color subregion changes the error postponing or shift to an earlier date, therefore, it is possible to control the first colour wheel and the second colour wheel synchronous rotary more accurately.
If the second colour wheel is filter wheel, due to the color filter regions in filter wheel and fluorescence through region be coated with reflectance coating, can be specifically infrared reflection film or ultraviolet reflectance film, the light of this wavelength band can be reflected, laser-transmitting district still keeps infrared transmission to be example explanation simultaneously, then the reflection of signal and transmission change, accurately reflect the change from fluorescence color subregion to laser color subregion.Thus the saltus step of level accurately can reflect the zone boundary of color or the switching of color color, in like manner, with paste compared with the scheme of MARK block at the second color wheel motor side surface, the reacting condition that such scheme switches color is more accurate, there is not error.
Based on this color switch instances of two colour wheels is compared, the synchronism deviation degree of two colour wheels can be known, thus export situation by adjusting colour wheel rotating speed and observing the second colour wheel color, the first colour wheel and the second colour wheel synchronous rotary can be controlled more accurately.
As shown in figure 16, for the embodiment of the present invention also provides a kind of laser projection device structural representation.
In Figure 16, comprise first group of sensor, 1201, second group of sensor 1202, control module 1203.
First group of sensor 1201, for detecting the first area in the wheel face of the first colour wheel, and produces the first level skip signal when each swing circle first time of the first colour wheel detects described first area;
Second group of sensor 1202, for detecting the second area in the wheel face of the second colour wheel, and produces second electrical level skip signal when each swing circle first time of the second colour wheel detects described second area;
Control module 1203, for judging whether the mistiming of described first level skip signal and described second electrical level skip signal is threshold value, if not, then adjust the rotating speed of described first colour wheel and/or described second colour wheel, the mistiming making described first level skip signal and described second electrical level skip signal is described threshold value.
Optionally, described first area is the transparent region in described first colour wheel, described transparent region is the laser-transmitting district of described first colour wheel, make the detection light of described first group of sensor emission when each swing circle first time of the first colour wheel detects described first area, the detection light of described first group of sensor emission passes described first area and is received by described first group of sensor, produces described first level skip signal; Or, described first area is aluminium base district, make the detection light of described first group of sensor emission when each swing circle first time of the first colour wheel detects described first area, the detection light of described first group of sensor emission is reflected by described first area and is received by described first group of sensor, produces described first level skip signal;
Described second area is the transparent region in described second colour wheel, make the detection light of described second group of sensor emission when each swing circle first time of the second colour wheel detects described second area, the detection light of described second group of sensor emission passes described second area and is received by described second group of sensor, produces described second electrical level skip signal; Or, described second area is the filtered region in described second colour wheel, surface coverage one deck reflecting coating of described filtered region, for reflecting the detection light of described second group of sensor emission, make the detection light of described second group of sensor emission when each swing circle first time of the second colour wheel detects described second area, the detection light of described second group of sensor emission is reflected by described second area and is received by described second group of sensor, produces described second electrical level skip signal;
Wherein, the transparent region in the transparent region in described first colour wheel or described second colour wheel is made up of clear glass, or is made up of transparent diffuser panel material.
Optionally, described first group of sensor 1201 comprises the first emission sensor and the first receiving sensor, and described first emission sensor is positioned at the first surface of described first colour wheel, for emission detection light; Described first receiving sensor is positioned at second of described first colour wheel and is positioned in the light path of the detection light that described first emission sensor is launched;
The detection light that described first emission sensor is launched is when each swing circle first time of the first colour wheel detects described first area, described detection light passes described first area and is received by described first receiving sensor, produces described first level skip signal.
Optionally, described first group of sensor 1201 comprises the first emission sensor and the first receiving sensor, and described first emission sensor is positioned at the first surface of described first colour wheel, for emission detection light; Described first receiving sensor is positioned at second of described first colour wheel and is positioned in the light path of the detection light that described first emission sensor is launched;
The detection light that described first emission sensor is launched is when each swing circle first time of the first colour wheel detects described first area, and the detection light that described first emission sensor is launched is reflected, and produces described first level skip signal.
Optionally, described first group of sensor 1201 comprises the first sending and receiving sensor, and described first sending and receiving sensor is used for emission detection light, and the light path of the detection light of described first sending and receiving sensor transmitting is vertical with the one side of described first colour wheel;
Described first transmitting-receiving penetrates the detection light of sensor emission when each swing circle first time of the first colour wheel detects described first area, and described detection light, through described first area, produces described first level skip signal.
Optionally, described first group of sensor 1201 comprises the first sending and receiving sensor, and described first sending and receiving sensor is used for emission detection light, and the light path of the detection light of described first sending and receiving sensor transmitting is vertical with the one side of described first colour wheel;
The reflected light that the detection light that sensor emission is penetrated in described first transmitting-receiving is formed when each swing circle first time of the first colour wheel detects described first area is received by described first sending and receiving sensor, produces described first level skip signal.
Optionally, described second group of sensor 1202 comprises the second emission sensor and the second receiving sensor, and described second emission sensor is positioned at the first surface of described second colour wheel, for emission detection light; Described second receiving sensor is positioned at second of described second colour wheel and is positioned in the light path of the detection light that described second emission sensor is launched;
The detection light that described second emission sensor is launched is when each swing circle first time of the second colour wheel detects described second area, described detection light passes described second area and is received by described second receiving sensor, produces described second electrical level skip signal.
Optionally, described second group of sensor 1202 comprises the second emission sensor and the second receiving sensor, and described second emission sensor is positioned at the first surface of described second colour wheel, for emission detection light; Described second receiving sensor is positioned at second of described second colour wheel and is positioned in the light path of the detection light that described second emission sensor is launched;
The detection light that described second emission sensor is launched is when each swing circle first time of the second colour wheel detects described second area, and the detection light that described second emission sensor is launched is reflected, and produces described second electrical level skip signal.
Optionally, described second group of sensor 1202 comprises the second sending and receiving sensor, and described second sending and receiving sensor is used for emission detection light, and the light path of the detection light of described second sending and receiving sensor transmitting is vertical with the one side of described second colour wheel;
Described second transmitting-receiving penetrates the detection light of sensor emission when each swing circle first time of the second colour wheel detects described second area, and described detection light, through described second area, produces described second electrical level skip signal.
Optionally, described second group of sensor 1202 comprises the second sending and receiving sensor, and described second sending and receiving sensor is used for emission detection light, and the light path of the detection light of described second sending and receiving sensor transmitting is vertical with the one side of described second colour wheel;
The reflected light that the detection light that described second sending and receiving sensor is launched is formed when each swing circle first time of the second colour wheel detects described second area is received by described second sending and receiving sensor, produces described second electrical level skip signal.
According to the method that the embodiment of the present invention provides, by utilizing the different of the first colour wheel and the material of the second colour wheel own, suitable sensor is selected to detect its colour wheel, do not need additionally to increase the mark of label as sensor identification, therefore can precisely switch between each color of light that each colour wheel finally exports, non-mixed color light.And use at present paste black light-absorbing adhesive tape to make marks in color wheel motor rotating shaft or on colour wheel wheel face, so that sensor can detect the mark of colour wheel, and then obtain colour wheel rotating speed and identify the initial time of synchronous color, the mark pasted by alignment realizes the synchronous of colour wheel, the method needs binding mark, therefore there is the inevitable errors of assembling, there is colour mixture between the synchronous latter two color of colour wheel, need to reject this part colour mixture, thus have impact on the brightness of image of whole optical projection system.Compared with the method that detection method provided by the invention and subsides black light-absorbing adhesive tape make marks, the precision of the method detection is high, method is easy, reduce the complexity of internal control system software and hardware, improve the optical efficiency of optical-mechanical system, increase the output brightness of optical-mechanical system, the image color that whole laser projection system is exported configuration is more accurate, saturation degree is higher.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention, then the present invention is also intended to comprise these change and modification.

Claims (12)

1. a polychrome wheel synchronous method, it is characterized in that, the method comprises:
Detected the first area in the wheel face of the first colour wheel by first group of sensor, and produce the first level skip signal when each swing circle first time of the first colour wheel detects described first area;
Detected the second area in the wheel face of the second colour wheel by second group of sensor, and produce second electrical level skip signal when each swing circle first time of the second colour wheel detects described second area;
Whether the mistiming judging described first level skip signal and described second electrical level skip signal is threshold value, if not, then adjust the rotating speed of described first colour wheel and/or described second colour wheel, the mistiming making described first level skip signal and described second electrical level skip signal is described threshold value.
2. the method for claim 1, it is characterized in that, described first area is the transparent region in described first colour wheel, make the detection light of described first group of sensor emission when each swing circle first time of the first colour wheel detects described first area, the detection light of described first group of sensor emission passes described first area and is received by described first group of sensor, produces described first level skip signal; Or, described first area is aluminium base district, make the detection light of described first group of sensor emission when each swing circle first time of the first colour wheel detects described first area, the detection light of described first group of sensor emission is reflected by described first area and is received by described first group of sensor, produces described first level skip signal;
Described second area is the transparent region in described second colour wheel, make the detection light of described second group of sensor emission when each swing circle first time of the second colour wheel detects described second area, the detection light of described second group of sensor emission passes described second area and is received by described second group of sensor, produces described second electrical level skip signal; Or, described second area is the filtered region in described second colour wheel, surface coverage one deck reflecting coating of described filtered region, for reflecting the detection light of described second group of sensor emission, make the detection light of described second group of sensor emission when each swing circle first time of the second colour wheel detects described second area, the detection light of described second group of sensor emission is reflected by described second area and is received by described second group of sensor, produces described second electrical level skip signal;
Wherein, the transparent region in the transparent region in described first colour wheel or described second colour wheel is made up of clear glass, or is made up of transparent diffuser panel material.
3. method as claimed in claim 1 or 2, it is characterized in that, the described first area detected by first group of sensor in the first colour wheel, and produce the first level skip signal when each swing circle first time of the first colour wheel detects described first area, comprising:
Described first group of sensor comprises the first emission sensor and the first receiving sensor, and described first emission sensor is positioned at the first surface of described first colour wheel, for emission detection light; Described first receiving sensor is positioned at second of described first colour wheel and is positioned in the light path of the detection light that described first emission sensor is launched;
The detection light that described first emission sensor is launched is when each swing circle first time of the first colour wheel detects described first area, described detection light passes described first area and is received by described first receiving sensor, produces described first level skip signal.
4. method as claimed in claim 1 or 2, it is characterized in that, the described first area detected by first group of sensor in the first colour wheel, and produce the first level skip signal when each swing circle first time of the first colour wheel detects described first area, comprising:
Described first group of sensor comprises the first sending and receiving sensor, and described first sending and receiving sensor is used for emission detection light, and the light path of the detection light of described first sending and receiving sensor transmitting is vertical with the one side of described first colour wheel;
Described first transmitting-receiving penetrates the detection light of sensor emission when each swing circle first time of the first colour wheel detects described first area, and described detection light, through described first area, produces described first level skip signal.
5. method as claimed in claim 1 or 2, be is characterized in that, detected the second area in the second colour wheel by second group of sensor, and produces second electrical level skip signal when each swing circle first time of the second colour wheel detects described second area, comprising:
Described second group of sensor comprises the second emission sensor and the second receiving sensor, and described second emission sensor is positioned at the first surface of described second colour wheel, for emission detection light; Described second receiving sensor is positioned at second of described second colour wheel and is positioned in the light path of the detection light that described second emission sensor is launched;
The detection light that described second emission sensor is launched is when each swing circle first time of the second colour wheel detects described second area, described detection light passes described second area and is received by described second receiving sensor, produces described second electrical level skip signal.
6. method as claimed in claim 1 or 2, be is characterized in that, detected the second area in the second colour wheel by second group of sensor, and produces second electrical level skip signal when each swing circle first time of the second colour wheel detects described second area, comprising:
Described second group of sensor comprises the second sending and receiving sensor, and described second sending and receiving sensor is used for emission detection light, and the light path of the detection light of described second sending and receiving sensor transmitting is vertical with the one side of described second colour wheel;
Described second transmitting-receiving penetrates the detection light of sensor emission when each swing circle first time of the second colour wheel detects described second area, and described detection light, through described second area, produces described second electrical level skip signal.
7. laser projection device: comprise the first colour wheel and second colour wheel, it is characterized in that, at least comprise:
First group of sensor, for detecting the first area in the wheel face of the first colour wheel, and produces the first level skip signal when each swing circle first time of the first colour wheel detects described first area;
Second group of sensor, for detecting the second area in the wheel face of the second colour wheel, and produces second electrical level skip signal when each swing circle first time of the second colour wheel detects described second area;
Control module, for judging whether the mistiming of described first level skip signal and described second electrical level skip signal is threshold value, if not, then adjust the rotating speed of described first colour wheel and/or described second colour wheel, the mistiming making described first level skip signal and described second electrical level skip signal is described threshold value.
8. device as claimed in claim 7, it is characterized in that, described first area is the transparent region in described first colour wheel, make the detection light of described first group of sensor emission when each swing circle first time of the first colour wheel detects described first area, the detection light of described first group of sensor emission passes described first area and is received by described first group of sensor, produces described first level skip signal; Or, described first area is aluminium base district, make the detection light of described first group of sensor emission when each swing circle first time of the first colour wheel detects described first area, the detection light of described first group of sensor emission is reflected by described first area and is received by described first group of sensor, produces described first level skip signal;
Described second area is the transparent region in described second colour wheel, make the detection light of described second group of sensor emission when each swing circle first time of the second colour wheel detects described second area, the detection light of described second group of sensor emission passes described second area and is received by described second group of sensor, produces described second electrical level skip signal; Or, described second area is the filtered region in described second colour wheel, surface coverage one deck reflecting coating of described filtered region, for reflecting the detection light of described second group of sensor emission, make the detection light of described second group of sensor emission when each swing circle first time of the second colour wheel detects described second area, the detection light of described second group of sensor emission is reflected by described second area and is received by described second group of sensor, produces described second electrical level skip signal;
Wherein, the transparent region in the transparent region in described first colour wheel or described second colour wheel is made up of clear glass, or is made up of transparent diffuser panel material.
9. device as claimed in claim 7 or 8, it is characterized in that, described first group of sensor comprises the first emission sensor and the first receiving sensor, and described first emission sensor is positioned at the first surface of described first colour wheel, for emission detection light; Described first receiving sensor is positioned at second of described first colour wheel and is positioned in the light path of the detection light that described first emission sensor is launched;
The detection light that described first emission sensor is launched is when each swing circle first time of the first colour wheel detects described first area, described detection light passes described first area and is received by described first receiving sensor, produces described first level skip signal.
10. device as claimed in claim 7 or 8, it is characterized in that, described first group of sensor comprises the first sending and receiving sensor, and described first sending and receiving sensor is used for emission detection light, and the light path of the detection light of described first sending and receiving sensor transmitting is vertical with the one side of described first colour wheel;
Described first transmitting-receiving penetrates the detection light of sensor emission when each swing circle first time of the first colour wheel detects described first area, and described detection light, through described first area, produces described first level skip signal.
11. devices as claimed in claim 7 or 8, is characterized in that, described second group of sensor comprises the second emission sensor and the second receiving sensor, and described second emission sensor is positioned at the first surface of described second colour wheel, for emission detection light; Described second receiving sensor is positioned at second of described second colour wheel and is positioned in the light path of the detection light that described second emission sensor is launched;
The detection light that described second emission sensor is launched is when each swing circle first time of the second colour wheel detects described second area, described detection light passes described second area and is received by described second receiving sensor, produces described second electrical level skip signal.
12. devices as claimed in claim 7 or 8, it is characterized in that, described second group of sensor comprises the second sending and receiving sensor, and described second sending and receiving sensor is used for emission detection light, and the light path of the detection light of described second sending and receiving sensor transmitting is vertical with the one side of described second colour wheel;
Described second transmitting-receiving penetrates the detection light of sensor emission when each swing circle first time of the second colour wheel detects described second area, and described detection light, through described second area, produces described second electrical level skip signal.
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