CN108540786A - The scanning projection method of laser scanning projection's instrument - Google Patents
The scanning projection method of laser scanning projection's instrument Download PDFInfo
- Publication number
- CN108540786A CN108540786A CN201810372951.XA CN201810372951A CN108540786A CN 108540786 A CN108540786 A CN 108540786A CN 201810372951 A CN201810372951 A CN 201810372951A CN 108540786 A CN108540786 A CN 108540786A
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- Prior art keywords
- scanning
- slow axis
- scanning galvanometer
- instrument
- projection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
- H04N9/312—Driving therefor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Mechanical Optical Scanning Systems (AREA)
Abstract
The present invention provides a kind of scanning projection method of laser scanning projection's instrument, including：It is scanned by the scanning galvanometer fast axle and scanning galvanometer slow axis of laser scanning projection's instrument, the scan mode of scanning galvanometer slow axis is the scan mode of nonlinear motion；Wherein, during every row scans, scanning galvanometer slow axis is made to be in stationary state in predeterminated position by regulating and controlling driving current；Wherein, when the driving current of scanning galvanometer slow axis is drop-out current, while reverse current is provided for scanning galvanometer slow axis, scanning galvanometer slow axis remains static under the driving of reverse current, and scanning galvanometer fast axle does always scanning motion；Then flow currents are provided for scanning galvanometer slow axis, scanning galvanometer slow axis is scanned movement under the driving of flow currents, and is moved to next line.Using the present invention, it can solve the problems, such as the intersection oblique line after the scanning back and forth of existing laser scanning projection's instrument and cause the image projection of mistake.
Description
Technical field
The present invention relates to laser scanning projection's instrument technical fields, more specifically, are related to a kind of laser scanning projection's instrument
Scanning projection method.
Background technology
Scanning galvanometer when core devices in laser scanning projection's instrument, scanning galvanometer are divided into fast axle scanning and slow axis scanning.
Fast axis direction is to realize scanning using the quick resonance of MEMS mirror, is incident on MEMS mirror using laser light source now
On, it can be projected out two row images by a cycle scanning back and forth of MEMS mirror.
But because slow axis is uniform motion, can cause to scan back and forth the two lines projected not in this way to be mutually flat
Capable, but the oblique line of an angled intersection.These oblique lines scanned back and forth can cause the image projection of mistake.
Therefore, to solve the above-mentioned problems, the present invention proposes a kind of scanning projection method of laser scanning projection's instrument.
Invention content
In view of the above problems, the object of the present invention is to provide a kind of scanning projection methods of laser scanning projection's instrument, with solution
Intersection oblique line after the scanning back and forth of certainly existing laser scanning projection's instrument and the problem of cause the image projection of mistake.
The present invention provides a kind of scanning projection method of laser scanning projection's instrument, including：Pass through laser scanning projection's instrument
Scanning galvanometer fast axle and scanning galvanometer slow axis are scanned, and the scan mode of scanning galvanometer slow axis is the scanning side of nonlinear motion
Formula；Wherein,
During every row scans, scanning galvanometer slow axis is set to be in static shape in predeterminated position by regulating and controlling driving current
State；Wherein,
When the driving current of scanning galvanometer slow axis is drop-out current, while reverse current is provided for scanning galvanometer slow axis,
Scanning galvanometer slow axis remains static under the driving of reverse current, and scanning galvanometer fast axle does always scanning motion；
Then flow currents are provided for scanning galvanometer slow axis, scanning galvanometer slow axis is scanned under the driving of flow currents
Movement, and moved to next line.
Furthermore it is preferred that scheme be that the type of drive of scanning galvanometer slow axis is electromagnetic drive mode or electrostatic drive side
Formula；Wherein,
Scanning galvanometer slow axis is scanned by angular speed nonlinear motion.
Furthermore it is preferred that scheme be that laser scanning projection's instrument is during scanning projection, the angular speed of scanning galvanometer slow axis
It is directly proportional to driving current.
Furthermore it is preferred that scheme be that scanning galvanometer slow axis includes housing parts and shakes with the fixed slow axis of housing section split-phase
Mirror part.
Furthermore it is preferred that scheme be that scanning galvanometer fast axle includes body supports part and MEMS galvanometers, wherein main body branch
Support part point is connect with MEMS galvanometers by cantilever.
Furthermore it is preferred that scheme be that scanning galvanometer fast axle drives MEMS galvanometers to do simple harmonic oscillation under the action of resonance.
Furthermore it is preferred that scheme be that, when MEMS galvanometers are in initial end, the positions of MEMS galvanometers is mutually 2N π, when MEMS galvanometers
When moving to the other end, the position of MEMS galvanometers is mutually (2N+1) π, wherein N is integer；
Then when the position of MEMS galvanometers mutually in 2N π~(2N+1) π when, the MEMS galvanometer directions of motion are to sweep anchor to another from initial end
One end；
When the position of MEMS galvanometers phase is in (2N+1) π~(2N+2) π, MEMS galvanometers are scanned from the other end to initial end.
From technical solution above it is found that the scanning projection method of laser scanning projection's instrument provided by the invention, by sweeping
Retouch the nonlinear scanning of galvanometer slow axis so that the angular speed nonlinear motion in rotation of scanning galvanometer slow axis, by adjusting non-thread
Property movement, with eliminate after laser scanning projection's instrument scans back and forth intersection oblique line drop shadow effect.
To the accomplishment of the foregoing and related purposes, one or more aspects of the present invention includes the spy being particularly described below
Sign.Certain illustrative aspects of the invention is described in detail in the following description and the annexed drawings.However, these aspect instructions are only
It is that some of the various ways in the principles of the present invention can be used.In addition, the present invention is intended to include all such aspects with
And their equivalent.
Description of the drawings
By reference to the explanation below in conjunction with attached drawing, and with a fuller understanding of the present invention, of the invention is other
Purpose and result will be more clearly understood and understood.In the accompanying drawings：
Fig. 1 is the scanning projection method flow schematic diagram according to laser scanning projection's instrument of the embodiment of the present invention；
Fig. 2 is the scanning galvanometer fast axle structural profile illustration according to the embodiment of the present invention；
Fig. 3 is the position phase schematic diagram according to the scanning galvanometer fast axle of the embodiment of the present invention；
Fig. 4 is the angular velocity of vibration and time relationship schematic diagram according to the scanning galvanometer fast axle of the embodiment of the present invention；
Fig. 5 is the scanning galvanometer slow axis structural schematic diagram according to the embodiment of the present invention；
Fig. 6 is the angular velocity of vibration and time relationship schematic diagram of traditional scanning galvanometer slow axis；
Fig. 7 is the scanning line schematic diagram of conventional laser scanning projector；
Fig. 8 is traditional scanning galvanometer slow axis position and time diagram；
Fig. 9 is the scanning galvanometer slow axis position and time diagram one according to the embodiment of the present invention；
Figure 10 is the scanning galvanometer slow axis position and time diagram two according to the embodiment of the present invention；
Figure 11 is the scanning galvanometer fast axle scan image schematic diagram according to the embodiment of the present invention；
Figure 12 is to be intended to the relationship that the time is shown according to the scanning galvanometer slow axis driving current signal of the embodiment of the present invention.
Reference numeral therein includes：101, body supports part, 102, MEMS galvanometers, 1031, cantilever, 1032, cantilever,
103, housing parts, 104, slow axis galvanometer part.
Identical label indicates similar or corresponding feature or function in all the appended drawings.
Specific implementation mode
In the following description, for purposes of illustration, it in order to provide the comprehensive understanding to one or more embodiments, explains
Many details are stated.It may be evident, however, that these embodiments can also be realized without these specific details.
Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In order to illustrate the scanning projection method of laser scanning projection's instrument according to the ... of the embodiment of the present invention provided by the invention, figure
1 shows the scanning projection method flow of laser scanning projection's instrument according to the ... of the embodiment of the present invention.
As shown in Figure 1, the scanning projection method of laser scanning projection's instrument provided by the invention, including：
It is scanned by the scanning galvanometer fast axle and scanning galvanometer slow axis of laser scanning projection's instrument, scanning galvanometer slow axis
Scan mode is the scan mode of nonlinear motion；Wherein, during every row scans, make scanning by regulating and controlling driving current
Galvanometer slow axis is in stationary state in predeterminated position；
Wherein, the specific method is as follows：
S110：When the driving current of scanning galvanometer slow axis is drop-out current, while being provided reversely for scanning galvanometer slow axis
Electric current, scanning galvanometer slow axis remain static under the driving of reverse current, and scanning galvanometer fast axle does always scanning motion；
S120：Then flow currents are provided for scanning galvanometer slow axis, scanning galvanometer slow axis under the driving of flow currents into
Row scanning motion, and moved to next line.
Wherein, it is the electric current driving due to providing reverse current for scanning galvanometer slow axis that scanning galvanometer slow axis, which is in static,
Scanning galvanometer slow axis is quickly moved to reversed direction, to offset the original inertia motion of scanning galvanometer slow axis and make slow axis court
Opposite direction moves, under the driving of this reverse current so that and scanning galvanometer slow axis remains static in this position, without
Moving sweep.
The dependency structure of laser scanning projection's instrument is described in detail below.
Fig. 2 shows scanning galvanometer fast axle cross-section structures according to the ... of the embodiment of the present invention.As shown in Fig. 2, scanning galvanometer is fast
Axis includes body supports part 101 and MEMS galvanometers 102, wherein body supports part 101 passes through cantilever with MEMS galvanometers 102
1031 and cantilever 1032 connect.
Wherein, scanning galvanometer fast axle is due to resonating so that the movement of MEMS galvanometers 102, moves approximate simple harmonic oscillation.When
When MEMS galvanometers 102 move to the leftmost side such as Fig. 2, the speed of MEMS galvanometers 102 is 0, and then MEMS galvanometers 102 can turn right
Movement, speed increases always, and when MEMS galvanometers 102 move to centre position, the speed of MEMS galvanometers 102 reaches maximum, so
MEMS galvanometers 102 are turned right movement afterwards, are slowed, and when moving to the rightmost side, speed 0 and so on forms simple harmonic quantity and shakes
It is dynamic.
Wherein, in an embodiment of the present invention, when MEMS galvanometers are moved in initial end, position is mutually that 2N π, MEMS galvanometers are transported
When moving the other end, position is mutually (2N+1) π, wherein N is integer；Then when position phase is in 2N π~(2N+1) π, the movement of MEMS galvanometers
Direction is to move to the other end from initial end, and MEMS galvanometers are scanned from initial end to the other end；When position is mutually in (2N+1) π~(2N+
2) when π, MEMS galvanometers are scanned from the other end to initial end.
Shown in citing, Fig. 3 shows the position phase of scanning galvanometer fast axle according to the ... of the embodiment of the present invention；As Fig. 3 and Fig. 2 are common
Shown, when MEMS galvanometers 102 move to the leftmost side, the position of MEMS galvanometers is mutually 2N π (N is integer), when MEMS galvanometers 102 are transported
When moving to the rightmost side, the position of MEMS galvanometers is mutually (2N+1) π (N is integer).So in the embodiment shown in fig. 3, working as MEMS
The position of galvanometer is mutually in 2N π~(2N+1) π, and 102 direction of motion of MEMS galvanometers is to move to right side from left side, and 21 be MEMS galvanometers
102 from left to right scan a row information, corresponding position phase (2N+1) π~(2N+2) π for working as MEMS galvanometers, and 22 be MEMS galvanometers
102 scan a line from right to left.
Scanning galvanometer slow axis structure is described below, Fig. 5 shows scanning galvanometer slow axis structure according to the ... of the embodiment of the present invention.
As shown in figure 5, scanning galvanometer slow axis include housing parts 103 and with 103 mutually fixed slow axis galvanometer part 104 of housing parts.
Wherein, the type of drive of scanning galvanometer slow axis is electromagnetic drive mode or electrostatic drive mode, wherein scanning galvanometer slow axis can
Independently to be separated with scanning galvanometer fast axle, can also integrate as a whole.
In Fig. 4 and embodiment shown in fig. 6, the angular velocity of vibration of scanning galvanometer slow axis：23 sweep for scanning galvanometer fast axle
Retouch the angular velocity of vibration and time chart of a frame image, the vibration of 24~26 frame images scanned for scanning galvanometer slow axis
Angular speed and time chart, wherein 25 are used for the scanning projection of scanning galvanometer slow axis, 24 Hes at the uniform velocity to vibrate from top to bottom, 25
26 is quickly at the uniform velocity vibrate from the bottom up, and 26 for replying scanning galvanometer slow axis to initial position, because scanning galvanometer slow axis is swept
The meeting retouched is not used in scanning projection this period there are one the interval of initial position is returned to, this section of region is for by slow axis
Invert back initial position.
In Fig. 2 to embodiment shown in Fig. 8, scanning galvanometer slow axis is then shaken in scanning with constant velocity vibration
For mirror fast axle in 21 regional movement, the image that laser light source projects after 102 scannings is 31, is equally gone out in 22 region projections
Image is 32, it can be seen that in the embodiment shown in fig. 7, the projection lines between 31 and 32 are not parallel two lines, and
It is two lines intersecting each other, such lines intersected back and forth can influence the effect of projection.
Wherein, in the embodiment shown in fig. 8, the position of scanning galvanometer slow axis scanning galvanometer slow axis under a frame image temporal
The relationship set between the time is as follows：241 and 261 for scanning galvanometer slow axis in initial position is returned to, this two parts is used
In slow axis galvanometer part 104 is returned to initial position, 251 for projecting slow axis scanning.
In order to enable the lines 31 and 32 after projection are parallel to each other, it is slow that the present invention proposes a kind of nonlinear scanning galvanometer
Axis type of drive, wherein concrete operations are exactly that the type of drive of scanning galvanometer slow axis is changed to nonlinear driving, such as Fig. 9
It is shown, scanning galvanometer slow axis be returned to the 242 of initial position with 262 with original 241 as 261, but thrown for scanning
The 251 uniform angular velocity movement of shadow becomes 252 of the zigzagging with one lattice of a lattice by non-linear drive.
In the embodiment shown in fig. 10, in 252 zigzag 2521 and 2522, when scanning galvanometer slow axis in the position
Formed one pause, scanning galvanometer fast axle is when 2521 stall positions are scanned because slow axis is opposing stationary, then the figure that scans
As being 311 and 321, as shown in figure 11, parallel to each other between the image 311 scanned and 321, there is no the feelings to intersect
Shape.
The specific implementation that scanning galvanometer slow axis is scanned projection in a manner of nonlinear motion is described in detail below,
No matter scanning galvanometer slow axis is driven to electromagnetic force or electrostatic force, the size of current of angular speed size and driving is directly proportional.
Figure 12 shows the relationship of scanning galvanometer slow axis driving current signal and time according to the ... of the embodiment of the present invention.Such as figure
Shown in 12, wherein 25211,25212 and 25213 be the current signal in 2521 scanning galvanometer slow axis position run times, 25211
Decline electric signal (drop-out current) for one, it is 0 which is reduced to electric current by original current signal；Simultaneously scanning is provided to shake
One reverse signal (reverse current) 25212 of mirror slow axis, electric signal driving scanning galvanometer slow axis are quickly transported in the opposite direction
It is dynamic, to offset the original inertia motion of slow axis and so that scanning galvanometer slow axis moves in the opposite direction, 25212 electric signals (instead
To electric current) driving under so that form the opposing stationary slow axis in a centre in 2521 regions, fast axle scans in this time
Go out 311 images (as shown in figure 11), then after the completion of the scanning of scanning galvanometer fast axle, scanning galvanometer slow axis is by 25213 switching electricity
Direction is flowed, scanning galvanometer slow axis also begins to scanning projection, and scanning projection slow axis is moved to 2522 positions.
That is, the driving current by regulating and controlling often capable scanning motion, i.e.,：Drop-out current 25211, reverse current
25212 and flow currents 25213 so that opposing stationary movement is presented in scanning galvanometer slow axis in position.
By the above embodiment as can be seen that the scanning projection method of laser scanning projection's instrument provided by the invention, leads to
Over-scan the nonlinear scanning of galvanometer slow axis so that the angular speed nonlinear motion in rotation of scanning galvanometer slow axis, by adjusting
Nonlinear movement, to eliminate the drop shadow effect of the intersection oblique line after laser scanning projection's instrument scans back and forth.
It describes above with reference to attached drawing and is thrown according to the scanning of laser scanning projection's instrument proposed by the present invention in an illustrative manner
Image method.It will be understood by those skilled in the art, however, that the scanning of the laser scanning projection's instrument proposed for aforementioned present invention
Projecting method can also make various improvement on the basis of not departing from the content of present invention.Therefore, protection scope of the present invention is answered
It is determined when by the content of appended claims.
Claims (7)
1. a kind of scanning projection method of laser scanning projection's instrument, including：Pass through the scanning galvanometer fast axle of laser scanning projection's instrument
It is scanned with scanning galvanometer slow axis, the scan mode of the scanning galvanometer slow axis is the scan mode of nonlinear motion；Wherein,
During every row scans, the scanning galvanometer slow axis is set to be in static shape in predeterminated position by regulating and controlling driving current
State；Wherein,
When the driving current of the scanning galvanometer slow axis is drop-out current, while reversed electricity is provided for the scanning galvanometer slow axis
Stream, the scanning galvanometer slow axis remain static under the driving of the reverse current, and the scanning galvanometer fast axle is done always
Scanning motion；
Then flow currents are provided for the scanning galvanometer slow axis, the scanning galvanometer slow axis is under the driving of the flow currents
It is scanned movement, and is moved to next line.
2. the scanning projection method of laser scanning projection's instrument as described in claim 1, wherein
The type of drive of the scanning galvanometer slow axis is electromagnetic drive mode or electrostatic drive mode；Wherein,
The scanning galvanometer slow axis is scanned by angular speed nonlinear motion.
3. the scanning projection method of laser scanning projection's instrument as claimed in claim 2, wherein
Laser scanning projection's instrument is during scanning projection, angular speed and the driving current of the scanning galvanometer slow axis
It is directly proportional.
4. the scanning projection method of laser scanning projection's instrument as described in claim 1, wherein
The scanning galvanometer slow axis include housing parts and with housing section split-phase fixed slow axis galvanometer part.
5. the scanning projection method of laser scanning projection's instrument as described in claim 1, wherein
The scanning galvanometer fast axle includes body supports part and MEMS galvanometers, wherein
The body supports part is connect with the MEMS galvanometers by cantilever.
6. the position phase method of adjustment of laser scanning projection's instrument as claimed in claim 5, wherein
The scanning galvanometer fast axle drives the MEMS galvanometers to do simple harmonic oscillation under the action of resonance.
7. the position phase method of adjustment of laser scanning projection as claimed in claim 5 instrument, wherein
When the MEMS galvanometers are in initial end, the positions of the MEMS galvanometers is mutually 2N π, when the MEMS galvanometers move to it is another
When end, the position of the MEMS galvanometers is mutually (2N+1) π, wherein N is integer；
Then when the position of MEMS galvanometers phase is in 2N π~(2N+1) π, the MEMS galvanometers are scanned from initial end to the other end；
When the position of MEMS galvanometers phase is in (2N+1) π~(2N+2) π, the MEMS galvanometers are scanned from the other end to initial
End.
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| CN201810372951.XA CN108540786A (en) | 2018-04-24 | 2018-04-24 | The scanning projection method of laser scanning projection's instrument |
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| CN201810372951.XA CN108540786A (en) | 2018-04-24 | 2018-04-24 | The scanning projection method of laser scanning projection's instrument |
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Cited By (2)
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| CN110460828A (en) * | 2019-08-22 | 2019-11-15 | 淮南师范学院 | A kind of micro electromechanical scanning mirror projection system and method |
| CN112859327A (en) * | 2019-11-27 | 2021-05-28 | 成都理想境界科技有限公司 | Image output control method and optical fiber scanning imaging system |
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Effective date of registration: 20201014 Address after: 261000 north of Yuqing street, east of Dongming Road, high tech Zone, Weicheng District, Weifang City, Shandong Province (Room 502, Geer electronic office building) Applicant after: GoerTek Optical Technology Co.,Ltd. Address before: 261031 Dongfang Road, Weifang high tech Industrial Development Zone, Shandong, China, No. 268 Applicant before: GOERTEK Inc. |
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