CN113009705A - Structured light assembly for eliminating zero-order diffraction influence - Google Patents
Structured light assembly for eliminating zero-order diffraction influence Download PDFInfo
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- CN113009705A CN113009705A CN201911317253.0A CN201911317253A CN113009705A CN 113009705 A CN113009705 A CN 113009705A CN 201911317253 A CN201911317253 A CN 201911317253A CN 113009705 A CN113009705 A CN 113009705A
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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
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/4205—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant
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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
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
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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
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
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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
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
Abstract
The invention provides a structured light component for eliminating the influence of zero-order diffraction, which comprises: a laser beam; a diffractive optic for receiving and expanding the laser beam and projecting the patterned beam toward the planar surface; and the refraction lens is positioned at one side of the diffraction optical device and is used for enabling the zero-order diffraction light in the patterning light beam to form background light on the pattern surface and enabling the negative first-order diffraction light or the positive first-order diffraction light in the patterning light beam to be focused on the pattern surface to form a pattern. According to the structured light assembly for eliminating the influence of zero-order diffraction, the diffraction device and the refraction lens are combined, and no focus point exists between the incident laser emitted from the diffraction device and the pattern surface, so that the pattern formed on the pattern surface is clearer, and the laser safety protection effect can be achieved.
Description
Technical Field
The invention relates to the field of diffractive optical devices, in particular to a structured light device for eliminating the influence of zero-order diffracted light.
Background
With the application of structured light technology to face ID mobile phone unlocking by apple, the application of structured light technology to 3D information identification is attracting more and more attention. 3D sensors were developed by PrimeSense corporation in Israel in 2006, Kinect gaming machine motion sensing accessories with built-in PrimeSense 3D sensors were released by Microsoft in 2009, and were purchased by PrimeSense apple Inc. in 2013. The structured light technology not only obtains strong interest of IT products, but also has wide application prospect in the fields of machine vision, safety identification, SLAM and the like, and can become an important technical module of a miniaturized depth camera. The structured light technology is to illuminate a space code to be measured by a light source, project a one-dimensional or two-dimensional specific image onto a measured object, and judge the surface shape and depth information of the measured object according to the deformation condition of the image. The structured light technology is an optical coding technology facing an application level, and a device design scheme and a manufacturing technology facing a device level according to the optical coding technology, and the technologies of the two levels need to be combined and optimized to advance.
For example, the Light Coding optical Coding technology of Primesense is the most representative structured Light technology at present, a pattern projected by an emitting device is called as "laser speckle", specifically, a diffraction spot is formed after laser is irradiated on the structured Light device, the position and the morphology information of an object can be calculated by analyzing a speckle pattern on the object, and the infrared laser forms a speckle with larger spatial distribution through a combined structure of a DOE diffraction optical device and a dammann grating in an early structured Light device. Analyzing the function of the device, aiming at realizing more space speckle distribution and larger space divergence angle, and aiming at the DOE preparation technology, the complicated space speckle distribution has great process difficulty for eliminating the laser zero order, so that the Primesense early scheme adopts the DOE and Dammann grating combination with simpler diffraction patterns to avoid the influence of zero order diffraction and realize larger space divergence angle. When the apple company applies the structured light technology, the structured light device is developed into a combination of a Vertical Cavity Surface Emitting Laser (VCSEL) and a Dammann grating, and the advantages are that the emitting surface of the laser has a pattern distribution, the problem of zero-order diffraction light of the traditional DOE device is solved, and the defect is that the cost of the laser is high.
Therefore, the invention provides a design scheme of a structured light assembly, in particular a design scheme based on the DOE technology, and eliminates the influence of zero-order diffraction, thereby providing an effective technical approach for the application of the structured light technology. The technical scope of the diffractive optical device discussed here is a micro optical device that can generate a diffraction pattern after being irradiated by laser light, and is also called a binary optical device. The diffraction optical field type can be divided into two types of far field diffraction (focal length is infinite) and near field diffraction (focal length), and the device implementation process can be divided into a two-step structure (the structure has two steps, namely high and low), a multi-step structure (a plurality of high and low structures) and a continuous step structure. Referring to fig. 1a to 1c, fig. 1a is a diffractive optical device with a two-step structure, fig. 1b is a diffractive optical device with a multi-step structure, and fig. 1c is a diffractive optical device with a continuous step structure.
The two-step far-field diffraction device is a type which is widely applied at present due to few manufacturing process steps, and generally needs to be applied by adopting a focusing lens combination, as shown in fig. 2, the two-step far-field diffraction device comprises a far-field diffraction device 21 with a two-step structure and a focusing lens 22, wherein a focusing plane of a diffraction pattern of the two-step far-field diffraction device and a focusing point of zero-order diffraction light are on the same pattern plane 23, if the zero-order diffraction light of the far-field diffraction device 21 with the two-step structure is not well inhibited, a relatively obvious central light spot is generated on the pattern plane 23, and the two-step far-field diffraction device has adverse effects on.
The near-field diffraction optical device has the characteristic of self-focusing, does not need a lens, and can present clear patterns in a limited distance according to design. As shown in fig. 3, which includes the near field diffraction device 24 having a two-step structure, the incident beam 100 enters the near field diffraction device 24 having a two-step structure to form a region of zero-order diffracted light on the pattern surface 23. Since the incident beam is not expanded greatly in the practical application of the structured light device, and the diameter of the incident beam is generally several millimeters, the influence of the zero-order diffracted light of the near-field diffraction device 24 with the two-step structure is significant.
Disclosure of Invention
The invention aims to provide a structured light assembly for eliminating the influence of zero-order diffraction, which aims to solve the problem that the safety of laser irradiation and later identification calculation are influenced because the zero-order diffraction light of a diffraction device in the prior art forms a central light spot on a pattern surface.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The invention provides a structured light component for eliminating the influence of zero-order diffraction, which comprises:
a laser beam;
the diffraction optical device is used for receiving and expanding the laser beam and projecting a patterned beam to a figure surface;
and the refraction lens is positioned at one side of the diffraction optical device and is used for enabling zero-order diffraction light in the patterned light beam to form background light on the pattern surface and enabling negative first-order diffraction light or positive first-order diffraction light in the patterned light beam to be focused on the pattern surface to form a pattern.
In one embodiment of the invention, the diffractive optical device is a near field diffractive device, the diffracted optical field of which comprises a positive first order and a negative first order diffracted optical field.
In one embodiment of the present invention, the diffractive optical device is a first diffractive device having a two-step structure, the refractive lens is a negative refractive lens that diverges negative first-order diffracted light and zero-order diffracted light of the patterned light beam, and the negative refractive lens focuses positive first-order diffracted light in the patterned light beam on the pattern surface to form a pattern.
In one embodiment of the invention, the first diffractive device is a near field diffractive device.
In one embodiment of the present invention, the diffractive optical device is a first diffractive device having a two-step structure, the refractive lens is a positive lens, the positive lens converges and diverges the positive first order diffracted light and the zero order diffracted light of the patterned light beam, and the positive lens focuses the negative first order diffracted light of the patterned light beam on the pattern surface to form a pattern.
In one embodiment of the invention, the first diffractive device is a near field diffractive device.
In one embodiment of the invention, the diffractive optical device is a near field diffractive device, the diffracted optical field of the near field diffractive device comprising a positive or negative first order diffracted optical field.
In one embodiment of the present invention, the diffracted light field of the near-field diffraction device comprises a positive first order diffracted light field, and the refractive lens is a negative refractive lens, and the negative refractive lens focuses the positive first order diffracted light in the patterned light beam to form a pattern on the pattern surface.
In one embodiment of the present invention, the near-field diffraction device is a second diffraction device having a multi-step structure or a continuous step structure.
The invention provides a structured light assembly for eliminating the influence of zero-order diffraction, which combines a diffraction device and a refraction lens, so that the zero-order diffraction light of the diffraction device is quickly converged or diverged by the refraction lens to form uniform background light on a pattern surface, and the positive first-order diffraction light or the negative first-order diffraction light of the diffraction device is refracted and then focused on the pattern surface to form a pattern, thereby solving the problem that the zero-order diffraction light of the diffraction device forms a central light spot on the pattern surface in the prior art.
Drawings
Fig. 1a to 1c show diffraction devices with different step structures in the prior art.
Fig. 2 is a schematic diagram of a structure of an incident light beam projected on a far-field diffraction device in the prior art.
Fig. 3 is a schematic diagram of a structure of an incident light beam projected on a near-field diffraction device in the prior art.
Fig. 4 is a structural optical component formed by combining a two-step structured near-field diffraction device and a negative refractive lens in the first embodiment of the present invention.
Fig. 5 is a structural optical component formed by combining a two-step structured near-field diffraction device and a positive refractive lens according to a second embodiment of the present invention.
Fig. 6 is a structural optical component formed by combining a near-field diffraction device with a continuous step structure and a negative refractive lens in a third embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the present invention will be made with reference to the accompanying drawings and examples.
Fig. 4 is a structural optical component formed by combining a two-step structured near-field diffraction device and a negative refractive lens in the first embodiment of the present invention. Referring to fig. 4, the present embodiment provides a structured light assembly for eliminating the influence of zero-order diffraction, including: a laser beam 100; diffractive optics for receiving and expanding the beam of laser light 100 and projecting a patterned beam onto the patterned surface 50; and a refractive lens located at one side of the diffractive optical device for forming the zero-order diffracted light 13 in the patterned beam into background light on the pattern surface and focusing the negative-order diffracted light or the positive-order diffracted light in the patterned beam into a pattern on the pattern surface 50.
In the present embodiment, the diffractive optical element is the first diffractive element 11 having a two-step structure, the refractive lens is the negative refractive lens 32, the negative refractive lens 32 disperses the negative first order diffracted light 120 and the zero order diffracted light 130 of the patterned beam, and the negative refractive lens 32 focuses the positive first order diffracted light 110 of the patterned beam on the pattern surface 50 to form a pattern. Specifically, the first diffractive device 11 is a near-field diffractive device.
Referring to fig. 4, the laser beam 100 and the negative refraction lens 32 are respectively located at two sides of the first diffraction device 11, the laser beam 100 irradiates on the first diffraction device 11 to generate a patterned beam, the patterned beam passes through the negative refraction lens 32, the negative refraction lens 32 disperses the negative first-order diffraction light 120 and the zero-order diffraction light 130 of the patterned beam, and the negative refraction lens 32 focuses the positive first-order diffraction light 110 of the patterned beam on the pattern surface 50 to form a pattern.
Fig. 5 is a structural optical component formed by combining a two-step structured near-field diffraction device and a positive refractive lens according to a second embodiment of the present invention. Referring to fig. 5, the present embodiment provides a structured light assembly for eliminating the influence of zero-order diffraction, including: a laser beam 100; diffractive optics for receiving and expanding the beam of laser light 100 and projecting a patterned beam onto the patterned surface 50; and a refractive lens located at one side of the diffractive optical element for forming the zero-order diffracted light 130 in the patterned beam into background light on the pattern surface and focusing the negative first-order diffracted light 120 or the positive first-order diffracted light 110 in the patterned beam into a pattern on the pattern surface 50.
In this embodiment, the diffractive optical element is the first diffractive element 11 having a two-step structure, the refractive lens is the positive refractive lens 31, the positive refractive lens 31 disperses the plus first order diffracted light 110 and the zero order diffracted light 130 of the patterned beam, and the minus first order diffracted light 120 of the patterned beam is focused on the pattern surface 50 to form a pattern. Specifically, the first diffractive device 11 is a near-field diffractive device.
With reference to fig. 5, the laser beam 100 and the positive refraction lens 31 are respectively located at two sides of the first diffraction device 11, the laser beam 100 irradiates on the first diffraction device 11 to generate a patterned beam, after the patterned beam passes through the positive refraction lens 31, the positive refraction lens 31 diverges the positive first-order diffraction light 110 and the zero-order diffraction light 13 of the patterned beam, and the positive refraction lens 31 focuses the negative first-order diffraction light 120 of the patterned beam on the pattern surface 50 to form a pattern.
In the two embodiments, the near-field diffraction device has a two-step structure, the diffraction field has positive and negative order distribution, only one order can be taken, and the energy utilization rate is less than 40.5% theoretically. However, when the near-field diffraction device with multi-step or continuous step distribution is adopted, only the positive first-order or negative first-order diffraction light field distribution can be designed, and the combination of the near-field diffraction device and the refraction lens has good light energy utilization rate.
Fig. 6 is a structural optical component formed by combining a near-field diffraction device with a continuous step structure and a negative refractive lens in a third embodiment of the present invention. Referring to fig. 6, the present embodiment provides a structured light assembly for eliminating the influence of zero-order diffraction, including: a laser beam 100; diffractive optics for receiving and expanding the beam of laser light 100 and projecting a patterned beam onto the patterned surface 50; and a refractive lens located at one side of the diffractive optical element for forming the zero-order diffracted light 130 in the patterned beam into background light on the pattern surface and focusing the negative first-order diffracted light 120 or the positive first-order diffracted light 110 in the patterned beam onto the pattern surface 50 to form the pattern 40. In particular, the diffractive optical element is a second diffractive element 12 having a continuous step structure, which second diffractive element 12 can be designed to have only a positive first order diffractive light field distribution or only a negative first order diffractive light field distribution. In other embodiments, the diffractive optical device may also be a diffractive device having a multi-step structure.
In this embodiment, the second diffractive device 12 is designed to have only the positive first order diffraction optical field distribution, the refractive lens is a negative refractive lens 32, the negative refractive lens 32 disperses the zero order diffraction light 130 of the patterned beam, and the negative refractive lens 32 focuses the positive first order diffraction light 110 of the patterned beam on the pattern plane 50 to form a pattern. In particular, the second diffractive device 12 is a near-field diffractive device.
Referring to fig. 6, the laser beam 100 and the negative refraction lens 32 are respectively located at two sides of the second diffraction device 12, the laser beam 100 irradiates on the second diffraction device 12 to generate a patterned beam, the negative refraction lens 32 disperses the zero-order diffraction light 130 of the patterned beam after the patterned beam passes through the negative refraction lens 32, and the negative refraction lens 32 focuses the positive first-order diffraction light 110 of the patterned beam on the pattern surface 50 to form a pattern.
The structured light assembly for eliminating the influence of zero-order diffraction combines the near-field diffraction device with the positive focal length and the negative refraction lens into a preferred embodiment, and incident laser does not have a focusing point between the emergent light of the structured light device and a focusing surface, so that the structured light assembly plays a role in laser safety protection.
The invention provides a structured light assembly for eliminating the influence of zero-order diffraction, which combines a diffraction device and a refraction lens, so that zero-order diffraction light 130 of the diffraction device is quickly converged or diverged by the refraction lens to form uniform background light on a pattern surface 50, and positive first-order diffraction light 110 or negative first-order diffraction light 120 of the diffraction device is refracted and then focused on the pattern surface to form a pattern, thereby solving the problem that the zero-order diffraction light 130 of the diffraction device forms a central light spot on the pattern surface in the prior art.
As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A structured light assembly that eliminates the effects of zero order diffraction, comprising:
a laser beam;
the diffraction optical device is used for receiving and expanding the laser beam and projecting a patterned beam to a figure surface;
and the refraction lens is positioned at one side of the diffraction optical device and is used for enabling zero-order diffraction light in the patterned light beam to form background light on the pattern surface and enabling negative first-order diffraction light or positive first-order diffraction light in the patterned light beam to be focused on the pattern surface to form a pattern.
2. The structured light assembly that eliminates the effect of zero order diffraction of claim 1 wherein the diffractive optical device is a near field diffractive device, the diffracted light field of the near field diffractive device comprising positive and negative first order diffracted light fields.
3. The structured light assembly according to claim 1, wherein the diffractive optical element is a first diffractive element having a two-step structure, the refractive lens is a negative refractive lens that disperses the negative first order diffracted light and the zero order diffracted light of the patterned light beam, and the negative refractive lens focuses the positive first order diffracted light of the patterned light beam onto the pattern surface to form a pattern.
4. The structured light assembly that eliminates the effect of zero order diffraction of claim 3 wherein the first diffractive device is a near field diffractive device.
5. The structured light assembly according to claim 1, wherein the diffractive optical element is a first diffractive element having a two-step structure, the refractive lens is a positive lens, the positive lens converges and diverges the positive first order diffracted light and the zero order diffracted light of the patterned light beam, and the positive lens focuses the negative first order diffracted light of the patterned light beam on the pattern surface to form a pattern.
6. The structured light assembly that eliminates the effect of zero order diffraction of claim 5 wherein the first diffractive device is a near field diffractive device.
7. The structured light assembly that eliminates the effect of zero order diffraction as claimed in claim 1 wherein the diffractive optical device is a near field diffractive device, the diffracted optical field of the near field diffractive device comprising a positive or negative first order diffracted optical field.
8. The structured light assembly that eliminates the effect of zero order diffraction of claim 7, wherein the diffracted light field of the near field diffraction device comprises a positive first order diffracted light field, and wherein the refractive lens is a negative refractive lens that focuses the positive first order diffracted light of the patterned light beam into a pattern on the pattern surface.
9. The structured light assembly that eliminates the influence of zero order diffraction, as set forth in claim 1, wherein the near-field diffraction device is a second diffraction device having a multi-step structure or a continuous step structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911317253.0A CN113009705A (en) | 2019-12-19 | 2019-12-19 | Structured light assembly for eliminating zero-order diffraction influence |
| PCT/CN2020/126416 WO2021120909A1 (en) | 2019-12-19 | 2020-11-04 | Structured light component capable of eliminating zero-order diffractive effect |
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| CN201911317253.0A CN113009705A (en) | 2019-12-19 | 2019-12-19 | Structured light assembly for eliminating zero-order diffraction influence |
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