CN105929559A - Laser module, laser module preparation method and depth measurement device - Google Patents
Laser module, laser module preparation method and depth measurement device Download PDFInfo
- Publication number
- CN105929559A CN105929559A CN201610446523.8A CN201610446523A CN105929559A CN 105929559 A CN105929559 A CN 105929559A CN 201610446523 A CN201610446523 A CN 201610446523A CN 105929559 A CN105929559 A CN 105929559A
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- laser
- light
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- lens
- parameter
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/30—Collimators
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/22—Measuring arrangements characterised by the use of optical techniques for measuring depth
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/0944—Diffractive optical elements, e.g. gratings, holograms
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention provides a laser module. The laser module comprises a light source which is used for emitting laser, a collimating optical element which is used for collimating the laser from the light source, and a diffractive optical element which is used for receiving the laser collimated by the collimating optical element and converting the laser into patterned laser. The light source comprises at least two light emitting elements. The collimating optical element comprises at least two lenses. The invention further discloses a depth measurement device and a laser module preparation method. According to the invention, the propagation range of structured light emitted from the laser module can be expanded; the contrast is improved; and heat dissipation is improved.
Description
Technical field
The present invention relates to optical field, particularly relate to a kind of laser module, laser module preparation side
Method and depth measurement device.
Background technology
Laser projection has been applied to multiple occasion.Such as, use laser projection to produce and there is pattern
Structure light and be incident upon on object, obtain on object projection pattern and obtain thing accordingly
The depth information of body, the 3D that can realize this object rebuilds.
Prior art generally uses lens collimated by the laser that laser diode produces, then
Use diffraction optical element (Diffractive Optical Elements, DOE) by swashing after collimation
Light is converted to have figuratum structure light.The laser that laser diode produces can regard Gaussian beam as,
Its intensity is Gauss distribution in the cross section being perpendicular to the direction of propagation, presents middle high surrounding low
State.The laser that laser diode produces is still Gaussian beam after collimated, but its parameter is sent out
Give birth to change.Laser after collimation is converted to have figuratum structure light by DOE, wraps in structure light
Include multiple little light beam, but due to the restriction of DOE preparation technology, the quantity of the medium and small light beam of structure light
It is limited with the peak power of little light beam.If using structure light that human body is carried out depth survey,
Then human body can not be caused damage by structure light, needs to meet the requirement of the safe laser of the first order, accordingly
The power of laser diode also restrained so that the spread scope of structure light is limited, and then makes
Obtain being limited in scope of depth survey.
Summary of the invention
The technical problem that present invention mainly solves is to provide a kind of laser module, laser module preparation side
Method and depth measurement device, it is possible to solve limited the asking of spread scope of structure light in prior art
Topic.
In order to solve above-mentioned technical problem, the technical scheme that the present invention uses is: provide one
Laser module, including: light source, it is used for launching laser；Collimation optics, for collimation from
The laser of light source；Diffraction optical element, for receiving the laser of collimated optical element collimation and inciting somebody to action
It is converted to the laser of patterning；Wherein light source includes at least two light-emitting component, and collimating optics
Element includes at least two lens.
Wherein, at least two in lens carries out standard to the different piece of the laser from light source respectively
Directly.
Wherein, the quantity of light-emitting component is identical with the quantity of lens, and light-emitting component is with lens one by one
Corresponding.
Wherein, light source includes at least two light-emitting component of periodic arrangement, wherein periodic arrangement
Refer to that the spacing between adjacent light emitting element is the most identical；Or light source includes that aperiodicity is arranged at least
Two light-emitting components, wherein aperiodicity arrangement refers to that the spacing between adjacent light emitting element is incomplete
Identical.
Wherein, to send the direction of propagation of laser the most parallel at least two light-emitting component；Or at least two
It is the most not parallel that light-emitting component sends in the direction of propagation of laser.
Wherein, collimation optics includes at least two lens of periodic arrangement, wherein periodically
Arrangement refers to that the spacing between adjacent lens is the most identical；Or collimation optics includes that aperiodicity is arranged
At least two lens of cloth, wherein aperiodicity arrangement refers to that the spacing between adjacent lens is incomplete
Identical.
Wherein, the optical axis of at least two lens is the most parallel；Or in the optical axis of at least two lens extremely
Small part is not parallel.
Wherein, the parameter of lens is according to the laser after the parameter of corresponding light-emitting component and collimation
Parameter determine, wherein the parameter of lens include optical axis direction, focal length, size, position and other
At least one in the spacing of lens, the parameter of light-emitting component includes position and other light-emitting components
Spacing, send in the wavelength of laser, the direction of propagation, waist radius, the angle of divergence, power extremely
Few one, the laser parameter after collimation includes in the direction of propagation, waist radius, the angle of divergence, power
At least one.
Wherein, light-emitting component is laser diode.
Wherein, collimation optics is microlens array.
In order to solve above-mentioned technical problem, another technical solution used in the present invention is: provide one
Plant depth measurement device, laser module, photographic head and the process circuit described including any of the above item；
Laser module is for producing the laser of patterning and being projected to target, and photographic head is used for obtaining
It is included in target the image of the laser pattern of projection；Process circuit for processing what photographic head obtained
Image is to obtain the depth information of target.
In order to solve above-mentioned technical problem, another technical solution used in the present invention is: provide one
Plant laser module preparation method, including: prepared substrate；Substrate arranges light source, wherein light source
Including at least two light-emitting component, it is used for launching laser；By collimation optics and diffraction optics unit
Part is arranged on fixture, and wherein collimation optics includes at least two lens, is used for collimating
From the laser of light source, diffraction optical element is for receiving the laser of collimated optical element collimation and inciting somebody to action
It is converted to the laser of patterning.
Wherein, the step arranging light source on substrate includes: form at least two on substrate luminous
Element.
Wherein, the step arranging light source on substrate includes: be arranged on by least two light-emitting component
On substrate.
Wherein, the quantity of light-emitting component is identical with the quantity of lens, and light-emitting component is with lens one by one
Corresponding.
Wherein, the parameter of lens is according to the laser after the parameter of corresponding light-emitting component and collimation
Parameter determine, wherein the parameter of lens include optical axis direction, focal length, size, position and other
At least one in the spacing of lens, the parameter of light-emitting component includes position and other light-emitting components
Spacing, send in the wavelength of laser, the direction of propagation, waist radius, the angle of divergence, power extremely
Few one, the laser parameter after collimation includes in the direction of propagation, waist radius, the angle of divergence, power
At least one.
The invention has the beneficial effects as follows: by use at least two lens as collimation optics,
It is uniform that the intensity of the laser after improving collimation is distributed in the cross section being perpendicular to the direction of propagation
Property, and then the spread scope of the structure light of expansion of laser light module outgoing improve contrast, use extremely
Few two light-emitting components, as light source, can improve heat dissipation problem.
Accompanying drawing explanation
Fig. 1 is the structural representation of laser module first embodiment of the present invention；
Fig. 2 is the top view of light source in laser module first embodiment of the present invention；
Fig. 3 is the top view of collimation optics in laser module first embodiment of the present invention；
Fig. 4 is the structural representation of depth measurement device first embodiment of the present invention；
Fig. 5 is the flow chart of laser module preparation method first embodiment of the present invention.
Detailed description of the invention
In conjunction with Fig. 1 to 3, laser module first embodiment of the present invention includes: light source 11, collimated light
Learn element 12 and diffraction optical element 13.Collimation optics 12 is arranged at light source 11 and diffraction
Between optical element 13.
Light source 11 includes four light-emitting components 111, and light-emitting component 111 is used for launching laser.In figure
The quantity of light-emitting component 111 and arrangement are only signal, the quantity of actual light-emitting component, arrange and send out
Go out depending on the direction of propagation of laser can need according to the design such as the pattern of structure light, the angle of emergence.Luminous
Element 111 can be edge-emitting laser diodes, it is also possible to for vertical cavity surface laser diode,
Or other kinds of laser instrument.Preferably, the laser that light-emitting component 111 is launched is iraser.
Shown in figure four light-emitting component 111 is in 2 × 2 matrix periodic arrangement, periodic arrangement
Refer to that the spacing between adjacent light emitting element is the most identical.Certainly, light-emitting component 111 can also be in non-
Spacing between periodic arrangement, i.e. adjacent light emitting element 111 is incomplete same.
In an embodiment of laser module of the present invention, all light-emitting components send the propagation of laser
Direction is the most parallel.
In another embodiment of laser module of the present invention, all light-emitting components send the biography of laser
That broadcasts in direction is the most not parallel.
The laser that light-emitting component 111 sends has certain angle of divergence, and collimation optics 12 includes
Four lens 121, for collimation from the laser of light source 11, the compression angle of divergence and can be more
Concentrate.Collimation optics 12 shown in figure is combined by four discrete lens 121,
Wherein lens 121 can be optical lens, certain lens 121 can also be Fresnel Lenses or
Microlens array.Collimation optics 12 can also be the lenticule battle array including at least two lens
Row.
In figure, the quantity of lens 121 is only signal, and the quantity of actual lens 121 is according to actual needs
Depending on.Shown in figure four lens 121 in 2 × 2 periodic arrangement, i.e. adjacent lens 121
Between spacing the most identical.Certainly, lens can also be arranged in aperiodicity, i.e. adjacent lens it
Between spacing incomplete same.The quantity of actual lens, arrangement and optical axis direction can be according to structure light
Pattern, depending on the design such as the angle of emergence needs.
Shown in figure four lens 121 are disposed on the same plane.Actual lens can be arranged on
In Different Plane, the such as composition of two or more lens on laser propagation direction telescope pair
Laser collimates.
In an embodiment of laser module of the present invention, at least two in lens is respectively to laser
Different piece collimate.
In an embodiment of laser module of the present invention, the lensed optical axis of institute is the most parallel.
In another embodiment of laser module of the present invention, at least portion in lensed optical axis
Divide not parallel.
In an embodiment of laser module of the present invention, the parameter of lens is sent out according to corresponding
Laser parameter after the parameter of optical element and collimation determines, wherein the parameter of lens includes optical axis side
To, focal length, size, position and other lenses spacing at least one, light-emitting component
Parameter include position and the spacing of other light-emitting components, send the wavelength of laser, the direction of propagation,
At least one in waist radius, the angle of divergence, power, the laser parameter after collimation includes propagation side
To, at least one in waist radius, the angle of divergence, power.Parameter according to light-emitting component is permissible
Calculate light-emitting component and send the optical field distribution of laser, in conjunction with the laser parameter after collimation, Ke Yiji
Calculate the parameter drawing lens.
In an embodiment of laser module of the present invention, light-emitting component is identical with the quantity of lens,
The parameter of configuration light-emitting component and the parameter of lens so that light-emitting component and lens one_to_one corresponding, i.e.
Make laser that each light-emitting component the sends the most corresponding lens of light field when propagating to lens
Without other lenses is impacted, so when calculating lens parameter, it is only necessary to calculate correspondence
Light-emitting component send the light field of laser, greatly reduce amount of calculation.Certainly, swashing in the present invention
In other embodiments of light module, the part or all of lens in collimation optics can be the most right
Answer at least two light-emitting component.
Diffraction optical element 13, for receiving the laser of collimated optical element 12 collimation and by it
Be converted to the laser of patterning, it would however also be possible to employ liquid crystal light valve replaces diffraction optical element 13 will
Laser after collimation is converted to the laser of patterning, i.e. structure light.
Structure light can be dynamic, it is also possible to is static.Can be by control light source works
Light-emitting component change over to realize dynamic structure light, it is also possible to by using controlled liquid
Brilliant light valve replaces diffraction optical element 13 to realize dynamic structure light.
In an embodiment of laser module of the present invention, according to the laser parameter after collimation and structure
The parameter of light calculates phase diffractive structure, prepare this structure the most on a surface of a substrate thus
Obtain diffraction optical element 13.
Using single lens as collimation optics in prior art, the purpose of collimation is that compression is sent out
Scattered angle makes it possible in quantity set, and the laser after collimation is still single bundle Gaussian beam, and its intensity distributions is equal
Even property is poor, and then affects the intensity homogeneity of the medium and small light beam of structure light that DOE is converted to.
By using at least two lens as collimation optics, light-emitting component is sent laser
Light field carries out pretreatment, and the laser different piece from light source is entered by least two in lens respectively
Row collimation so that the laser after collimation includes at least two bundle Gaussian beams.With of the prior art
Single lens is compared, the laser intensity after collimation in the cross section being perpendicular to the direction of propagation point
Cloth is more uniform.Owing to the waist radius of Gaussian beam is inversely proportional to the angle of divergence, with the Gauss of intensity
The standard deviation of distribution is directly proportional, and the standard deviation of Gauss distribution is the least, and its uniformity is the poorest.When at least
When laser is collimated by two lens composition telescopes, compared with using single lens, after collimation
Laser beam divergence less so that waist radius is bigger, and the uniformity of Distribution of laser intensity is more preferable.
After intensity distributions collimation evenly, laser makes the medium and small light of structure light that DOE is converted to
The intensity of bundle is more uniform, improves the contrast of structure light, improve simultaneously the angle of emergence of structure light with
Expand its spread scope, and the light intensity of light source can be improved while meeting safety requirements.
Additionally, pass through the arrangement of light-emitting component and send the direction of propagation of laser and/or the arrangement of lens
Design with optical axis direction, the uniformity of Distribution of laser intensity after collimation can be improved further,
And then improve the contrast of structure light and expand spread scope, such as will be close to the light-emitting component at center
The optical axis direction of the direction of propagation and/or lens that send laser is designed as deep incline direction.
If the structure of DOE to be made according to the laser parameter after collimation the amendment of correspondence, one can be entered
Step improves the contrast of structure light and expands spread scope.
By using at least two light-emitting component as light source, light source intensity can increased to improve
Heat dissipation problem is improved while structure distance light travels.
As shown in Figure 4, depth measurement device first embodiment of the present invention includes: laser module 1,
Photographic head 2 and process circuit 3.
Laser module 1 can be for institute in laser module any embodiment of the present invention and possible combination
The laser module stated, for producing the laser of patterning and being projected to target.Photographic head 2
For obtaining the image of the laser pattern being included in target projection.For improving image quality, shooting
The optical filter only allowing the light of laser module 1 shoot laser wave band to pass through, example can be included in 2
As, the laser that laser module 1 produces is iraser, and photographic head 2 includes infrared fileter.Place
Reason circuit 3 connects photographic head 2, for processing the image of photographic head acquisition to obtain the degree of depth of target
Information.
As it is shown in figure 5, laser module preparation method first embodiment of the present invention includes:
S1: prepared substrate.
S2: light source is set on substrate.
Light source includes at least two light-emitting component, is used for launching laser.
At least two light-emitting component can be formed on substrate by the technique such as epitaxial growth and photoetching,
The light-emitting component prepared can also be arranged on substrate.Can be further provided with on substrate sending out
The drive circuit of optical element.
S3: collimation optics and diffraction optical element are arranged on fixture.
Collimation optics includes at least two lens, for collimating the laser from light source, diffraction
Optical element is for receiving the laser of collimated optical element collimation and being converted into patterning
Laser.
Fixture can be fixed on substrate, it is also possible to carries out group with miscellaneous part together with substrate
Dress, such as, is separately fixed at substrate and fixture on housing.
Further, the different piece of the laser from light source is entered by least two in lens respectively
Row collimation.
Further, the quantity of light-emitting component is identical with the quantity of lens, and light-emitting component and lens
One_to_one corresponding.
Further, light source includes at least two light-emitting component of periodic arrangement, wherein periodically
Arrangement refers to that the spacing between adjacent light emitting element is the most identical；Or light source includes what aperiodicity was arranged
At least two light-emitting component, wherein aperiodicity arrangement refers to the spacing between adjacent light emitting element not
Identical.
Further, to send the direction of propagation of laser the most parallel at least two light-emitting component；Or at least
It is the most not parallel that two light-emitting components send in the direction of propagation of laser.
Further, collimation optics includes at least two lens of periodic arrangement, Qi Zhongzhou
The arrangement of phase property refers to that the spacing between adjacent lens is the most identical；Or collimation optics includes aperiodic
Property arrangement at least two lens, wherein aperiodicity arrangement refers to that spacing between adjacent lens is not
Identical.
Further, the optical axis of at least two lens is the most parallel；Or in the optical axis of at least two lens
The most not parallel.
Further, after the parameter of lens is according to the parameter of corresponding light-emitting component and collimation
Laser parameter determine, wherein the parameter of lens include optical axis direction, focal length, size, position and
At least one in the spacing of other lenses, the parameter of light-emitting component includes position and other luminescences
The spacing of element, send in the wavelength of laser, the direction of propagation, waist radius, the angle of divergence, power
At least one, the laser parameter after collimation includes the direction of propagation, waist radius, the angle of divergence, merit
At least one in rate.
Further, light-emitting component is laser diode.
Further, collimation optics is microlens array.
The foregoing is only embodiments of the present invention, not thereby limit the patent model of the present invention
Enclosing, every equivalent structure utilizing description of the invention and accompanying drawing content to be made or equivalence flow process become
Change, or be directly or indirectly used in other relevant technical fields, be the most in like manner included in the present invention's
In scope of patent protection.
Claims (16)
1. a laser module, it is characterised in that including:
Light source, is used for launching laser；
Collimation optics, for collimating the laser from described light source；
Diffraction optical element, for receiving the laser collimated through described collimation optics and by its turn
It is changed to the laser of patterning；
Wherein said light source includes at least two light-emitting component, and described collimation optics include to
Few two lens.
Laser module the most according to claim 1, it is characterised in that
The different piece of the laser from described light source is entered by least two in described lens respectively
Row collimation.
Laser module the most according to claim 1, it is characterised in that
The quantity of described light-emitting component is identical with the quantity of described lens, and described light-emitting component and institute
State lens one_to_one corresponding.
Laser module the most according to claim 1, it is characterised in that
Described light source includes at least two light-emitting component of periodic arrangement, and wherein said periodicity is arranged
Cloth refers to that the spacing between adjacent described light-emitting component is the most identical；
Or described light source includes at least two light-emitting component that aperiodicity is arranged, wherein said non-week
The arrangement of phase property refers to that the spacing between adjacent described light-emitting component is incomplete same.
Laser module the most according to claim 1, it is characterised in that
The direction of propagation that described at least two light-emitting component sends laser is the most parallel；
Or described at least two light-emitting component send in the direction of propagation of laser at least part of uneven
OK.
Laser module the most according to claim 1, it is characterised in that
Described collimation optics includes at least two lens of periodic arrangement, wherein said cycle
Property arrangement refer to that the spacing between adjacent described lens is the most identical；
Or described collimation optics includes at least two lens that aperiodicity is arranged, wherein said
Aperiodicity arrangement refers to that the spacing between adjacent described lens is incomplete same.
Laser module the most according to claim 1, it is characterised in that
The optical axis of described at least two lens is the most parallel；
Or the most not parallel in the optical axis of described at least two lens.
8. according to the laser module according to any one of claim 1-7, it is characterised in that
The parameter of described lens is according to the laser after the parameter of corresponding light-emitting component and collimation
Parameter determine, the parameter of wherein said lens include optical axis direction, focal length, size, position and
At least one in the spacing of other lenses, the parameter of described light-emitting component include position and other
The spacing of light-emitting component, send the wavelength of laser, the direction of propagation, waist radius, the angle of divergence, merit
At least one in rate, the laser parameter after described collimation includes the direction of propagation, waist radius, sends out
Dissipate at least one in angle, power.
9. according to the laser module according to any one of claim 1-7, it is characterised in that
Described light-emitting component is laser diode.
10. according to the laser module according to any one of claim 1-7, it is characterised in that
Described collimation optics is microlens array.
11. 1 kinds of depth measurement devices, it is characterised in that including:
Laser module, photographic head and process circuit as according to any one of claim 1-10；
Described laser module for producing the laser of patterning and be projected to target, described in take the photograph
As head is for obtaining the image of the laser pattern being included in described target projection；Described process circuit
For processing the image of described photographic head acquisition to obtain the depth information of described target.
12. 1 kinds of laser module preparation methoies, it is characterised in that including:
Prepared substrate；
Arranging light source on the substrate, wherein said light source includes at least two light-emitting component, uses
In launching laser；
Collimation optics and diffraction optical element are arranged on fixture, wherein said collimated light
Learn element and include at least two lens, for collimating the laser from described light source, described diffraction light
Learn element for receiving the laser collimated through described collimation optics and being converted into patterning
Laser.
13. methods according to claim 12, it is characterised in that
The described step arranging light source on the substrate includes:
Form described at least two light-emitting component on the substrate.
14. methods according to claim 12, it is characterised in that
The described step arranging light source on the substrate includes:
Described at least two light-emitting component is installed on the substrate.
15. methods according to claim 12, it is characterised in that
The quantity of described light-emitting component is identical with the quantity of described lens, and described light-emitting component and institute
State lens one_to_one corresponding.
16. according to the method according to any one of claim 12-15, it is characterised in that
The parameter of described lens is according to the laser after the parameter of corresponding light-emitting component and collimation
Parameter determine, the parameter of wherein said lens include optical axis direction, focal length, size, position and
At least one in the spacing of other lenses, the parameter of described light-emitting component include position and other
The spacing of light-emitting component, send the wavelength of laser, the direction of propagation, waist radius, the angle of divergence, merit
At least one in rate, the laser parameter after described collimation includes the direction of propagation, waist radius, sends out
Dissipate at least one in angle, power.
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| CN201610446523.8A CN105929559A (en) | 2016-06-20 | 2016-06-20 | Laser module, laser module preparation method and depth measurement device |
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| CN201610446523.8A CN105929559A (en) | 2016-06-20 | 2016-06-20 | Laser module, laser module preparation method and depth measurement device |
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| CN110225225A (en) * | 2018-03-02 | 2019-09-10 | 宁波舜宇光电信息有限公司 | Depth information camera module and its electronic equipment and laser monitor method with laser monitor function |
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| CN113325391A (en) * | 2017-12-08 | 2021-08-31 | 浙江舜宇智能光学技术有限公司 | Wide-angle TOF module and application thereof |
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