CN209044291U - A kind of optical module, optical projection mould group, sensing device and equipment - Google Patents

Abstract

The utility model is suitable for optics and electronic technology field, provides a kind of optical module, comprising: light beam adjustment section, for being collimated to light beam；The transmission direction of light beam is deflected to second direction from first direction by the reflex of reflecting surface by optical path-deflecting portion, including reflecting surface, to reduce optical module in the thickness of second direction；With pattern generation portion, rearrangement is carried out for the light field to light beam to form the pattern beam that can project predetermined pattern；Wherein, light beam adjustment section is located at the incident side or/and light emission side in optical path-deflecting portion, and pattern generation portion is located at the light emission side in optical path-deflecting portion.The utility model also provides a kind of optical projection mould group, sensing device and equipment including the optical module.

Description

An optical component, an optical projection module, a sensing device and equipment

technical field

The utility model belongs to the field of optical technology, in particular to an optical component, an optical projection module, a sensing device and equipment.

Background technique

Existing three-dimensional (3D) face recognition modules are usually thicker due to the need to ensure a sufficient optical path internally, which does not conform to the current design trend of thinner electronic devices. However, if the internal optical path of the 3D face recognition module is compressed in order to meet the thin design, its recognition effect will be affected.

Utility model content

The technical problem to be solved by the present invention is to provide a new type of optical assembly, optical projection module, sensing device and equipment, which can meet the requirements of thin design on the premise of maintaining a sufficient optical path.

Embodiments of the present utility model provide an optical assembly, comprising:

The beam adjustment part is used for collimating the beam;

The optical path deflecting part includes a reflective surface, and deflects the transmission direction of the light beam from the first direction to the second direction through the reflection of the reflective surface, so as to reduce the thickness of the optical component in the second direction; and

a pattern generating part for rearranging the light field of the light beam to form a pattern light beam capable of projecting a preset pattern;

Wherein, the light beam adjusting part is located on the light incident side or/and the light exit side of the optical path deflection part, and the pattern generating part is located on the light exit side of the optical path deflection part.

In certain embodiments, the first direction and the second direction are perpendicular.

In some embodiments, the light beam adjusting part is disposed on the light incident side of the optical path deflection part facing the light source, the light beam adjusting part collimates the light beam from the light source, and the collimated light beam is transmitted to the light source. When the reflection surface of the optical path deflecting part is reflected, the light beam transmission direction is deflected from the first direction to the second direction.

In some embodiments, the light beam adjusting portion is further disposed between the light exit side of the optical path deflection portion and the pattern generating portion, and the light beam adjusting portion and the optical path deflection portion are integrally formed, or the The light beam adjusting part and the optical path deflecting part are separate structures.

In some embodiments, the reflective surface deflects the direction of the light beam from the first direction to the second direction by realizing total reflection of the light beam, or the reflective surface is provided with a reflective film layer, which is reflected by the reflective film layer. The action deflects the beam direction from the first direction to the second direction.

In some embodiments, when the light beam adjusting part and the optical path deflecting part are separate structures, the optical path deflecting part further comprises a light incident side surface and a light exit side surface, and the collimated light beam is emitted from the light incident side surface. The side surface enters the optical path deflecting part and transmits in the first direction, when the light beam is transmitted to the reflecting surface, it is reflected, and the reflected light beam is transmitted in the second direction and exits from the light-emitting side surface;

When the light beam adjusting part and the optical path deflecting part are integrally formed, the light beam is collimated by the light beam adjusting part and then propagates in the first direction in the optical path deflecting part, and the light beam is reflected when it is transmitted to the reflective surface , the reflected light beam travels in the second direction.

In certain embodiments, the optical path deflecting portion includes a trapezoidal prism or a triangular prism.

In some embodiments, the light beam travels in the optical path deflector along a longer path in the first direction than in the second direction.

In some embodiments, the pattern generating part includes any one or a combination of a diffractive optical element, a microlens array and a grating.

Embodiments of the present invention provide an optical projection module for projecting a pattern beam with a preset pattern onto a measured target for sensing, which includes a light source and the optical component described in any one of the above; the The light source is a single-hole wide-surface vertical cavity surface emitting laser (Vertical Cavity Surface Emitting Laser, VCSEL). The light field is rearranged to form a patterned beam capable of projecting an irregular pattern; or

The light source is an array VCSEL, including a plurality of VCSEL light-emitting units irregularly distributed on the same semiconductor substrate, which can project irregularly distributed light spot patterns, and the pattern generating part replicates a plurality of the irregularly distributed light-emitting units. The light spot pattern is expanded within a preset expansion angle range to form an irregularly distributed light spot pattern projected on the object to be measured; or

The light source is an array type VCSEL, including a plurality of VCSEL light-emitting units formed on the same semiconductor substrate and evenly arranged at the same interval, which can project a uniformly distributed light spot pattern, and the pattern generating part generates the uniform light emitted by the light source. The light field is rearranged to form a patterned beam capable of projecting an irregular pattern; or

The light source is an array type VCSEL, including a plurality of VCSEL light-emitting units formed on the same semiconductor substrate and evenly arranged at the same interval, which can project a uniformly distributed light spot pattern, and the pattern generation part can also be along a preset direction. The light fields of the arranged light-emitting units are merged with each other to form a regularly arranged stripe pattern; or

The light source includes a first emitting part that emits a first light beam and a second emitting part that emits a second light beam, the first light beam is used to form a flood beam with uniform light intensity distribution, and the second light beam is used to form in the A pattern beam of a preset pattern is projected on the object to be measured, and the first emitting part and the second emitting part are formed on the same semiconductor substrate and operate independently through different control signals.

Embodiments of the present invention provide a sensing device for sensing three-dimensional information of a measured target. The sensing device includes the optical projection module and the sensing module of any one of the above embodiments. The sensing module is used to sense a preset pattern projected by the optical module on the object to be measured, and obtain three-dimensional information of the object to be measured by analyzing the image of the preset pattern.

A device includes the sensing device of any one of the above embodiments, the device performs corresponding functions according to three-dimensional information of a measured object sensed by the sensing device.

The optical components, optical projection modules, sensing devices and equipment provided by the embodiments of the present invention reduce the thickness of the overall module along the projection direction by partially deflecting the projection light path, which is beneficial to the improvement of various equipment using the module. Thin design.

Additional aspects and advantages of embodiments of the present invention will be set forth, in part, in the following description, and in part will be apparent from the following description, or learned by practice of embodiments of the invention.

Description of drawings

FIG. 1 is a schematic structural diagram of an optical assembly provided by a first embodiment of the present invention.

FIG. 2 is a schematic structural diagram of an optical assembly provided by a second embodiment of the present invention.

FIG. 3 is a schematic structural diagram of an optical assembly provided by a third embodiment of the present invention.

FIG. 4 is a schematic structural diagram of an optical assembly provided by a fourth embodiment of the present invention.

FIG. 5 is a schematic structural diagram of an optical assembly provided by a fifth embodiment of the present invention.

FIG. 6 is a schematic structural diagram of an optical assembly provided by a sixth embodiment of the present invention.

FIG. 7 is a schematic structural diagram of an optical assembly provided by a seventh embodiment of the present invention.

FIG. 8 is a schematic structural diagram of an optical assembly provided by an eighth embodiment of the present invention.

FIG. 9 is a schematic structural diagram of an optical assembly provided by a ninth embodiment of the present invention.

10 is a schematic structural diagram of an optical projection module provided by a tenth embodiment of the present invention.

11 is a schematic structural diagram of an optical projection module provided by the eleventh embodiment of the present invention.

12 is a schematic structural diagram of an optical projection module provided by the twelfth embodiment of the present invention.

13 is a schematic structural diagram of an optical projection module provided by the thirteenth embodiment of the present invention.

FIG. 14 is a schematic structural diagram of the light source of the optical projection module in FIG. 13 .

FIG. 15 is a schematic structural diagram of a sensing device provided by a fourteenth embodiment of the present invention.

FIG. 16 is a schematic structural diagram of the device provided by the fifteenth embodiment of the present invention.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, only used to explain the present invention, and should not be construed as a limitation of the present invention. In the description of the present invention, it should be understood that the terms "first" and "second" are only used for description, and should not be interpreted as indicating or implying relative importance or indicating the number or number of technical features indicated. Order. Thus, the technical features defined with "first" and "second" may explicitly or implicitly include one or more of the technical features. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a Detachable connection, or integrated connection; it can be a mechanical connection, an electrical connection or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be internal communication between two elements or between two elements. interaction relationship. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

The following disclosure provides many different embodiments or examples for implementing different structures of the invention. In order to simplify the disclosure of the present invention, only specific example components and settings are described below. Of course, they are only examples and are not intended to limit the invention. Furthermore, the present disclosure may reuse reference numerals and/or reference letters in various instances, such reuse is for simplicity and clarity of presentation of the present disclosure and does not in itself indicate the various embodiments and/or devices discussed. specific relationship between them. In addition, the various specific processes and materials provided in the following description of the present invention are only examples for realizing the technical solutions of the present invention, but those of ordinary skill in the art should realize that the technical solutions of the present invention can also be implemented through the following Other processes and/or other materials described.

Further, the described features and structures may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to enable a thorough understanding of the embodiments of the present invention. However, those skilled in the art will appreciate that the technical solutions of the present invention may be practiced without one or more of the specific details, or with other structures, components, and the like. In other instances, well-known structures or operations have not been shown or described in detail to avoid obscuring the essentials of the present invention.

As shown in FIG. 1 , the first embodiment of the present invention provides an optical component 1 for converting an original light beam emitted by a light source 10 into a pattern light beam having a preset pattern, and projecting the pattern light beam to a On the measurement target to sense the three-dimensional information of the measured target. The preset pattern can be a plurality of irregularly distributed light spots or a plurality of regularly arranged stripes. Of course, the preset pattern can also be other suitable patterns. No specific restrictions are made.

According to the sensing principle and application scenario, the original light beam may be a light beam with a specific wavelength. In this embodiment, the original light beam is, for example, infrared or near-infrared light, with a wavelength range of 750 nm (Nanometer, nm) to 1650 nm. Of course, the original light beam is not limited to infrared or near-infrared light, for example, it can also be other suitable light beams such as ultraviolet light.

At present, 3D sensing technology is widely used in smart terminals, Augmented Reality (AR)/Virtual Reality (VR), intelligent security, robot vision, autonomous driving, automated medical treatment and other fields. The pattern beam is a beam projected onto the measured object during the process of sensing the 3D information of the measured object, and a preset light pattern can be projected on the measured object to sense the measured object. 3D information. The acquired 3D information of the measured object has various applications, for example, functions such as face recognition can be realized by using the 3D information. It should be noted that the full text of the present invention does not specifically limit the application of the 3D information.

The optical assembly 1 includes a light beam adjusting part 12 , an optical path deflecting part 14 and a pattern generating part 16 . The original light beam emitted by the light source 10 is adjusted by the light beam adjusting part 12 and the optical path deflecting part 14 and then enters the pattern generating part 16 to generate a pattern light beam capable of projecting a preset pattern on the measured object.

The light beam adjusting part 12 is used for adjusting the original light beam emitted from the light source 10 , so that the light beam incident on the pattern generating part 16 is basically kept collimated and meets the preset aperture requirement. The light beam adjusting part 12 may include one or more optical structures 120 according to the characteristics of the original light beam emitted by the light source 10. For example, if the divergence angle of the original light beam emitted by the light source 10 is relatively large, the optical collimation structure 120 needs to be set to adjust the original light beam. Converted to approximately parallel collimated light, the range covered by the converted light beam will not change significantly with the optical path; if the aperture of the original light beam emitted by the light source 10 is too small, the optical beam expander structure 120 needs to be set to The aperture of the light beam is enlarged so that the entire pattern generating section 16 can be covered. The optical structure 120 may be one or more independent optical elements, or may be directly formed on the surface of other optical elements of the optical assembly 1 .

The optical structure 120 may be, but is not limited to, an aspherical structure. As long as the optical structure 120 can achieve desired functions, such as but not limited to collimation or beam expansion, various optical structures 120 in suitable shapes can be used.

The optical path deflection unit 14 is used to change the direction of the projected optical path to meet the optical path design requirements of the projected optical path along a specific direction. In order to meet the design requirement of thinning the optical module, the optical path deflecting part 14 deflects the outgoing direction of the projected light routing light source 10 by a specific angle before projecting it out, so as to reduce the thickness of the entire optical module along the final projection direction.

The optical path deflecting portion 14 includes a light incident side 140 , a reflective surface 142 and a light exit side 144 arranged in sequence along the optical path. The light incident side 140 is disposed toward the light source 10 for introducing the original light beam emitted by the light source 10 . The reflecting surface 142 is used to reflect the incident light beam toward the light exit side 144 of the optical path deflection unit 14 . The angle of inclination of the reflection surface 142 is set according to the angle of the optical path to be deflected by the optical path deflection unit 14 . The light exit side 144 is disposed toward the reflective surface 142 for projecting the light beam deflected by the reflective surface 142 .

In this embodiment, the optical path deflection unit 14 includes a reflecting prism, which deflects the light beam emitted from the light source 10 along the first direction X by approximately 90 degrees and then projects the light beam along the second direction Y. The light incident side 140 is one side surface of the reflective prism facing the light source 10 . The reflective surface 142 is an inclined surface of the reflective prism, and is approximately 45 degrees from the first direction X. As shown in FIG. The light outgoing side 144 is the surface of the reflecting prism facing the outgoing direction, and is substantially perpendicular to the surface of the light incident side 140 . The light beam adjusting part 12 includes an optical structure 120 having an optical collimation function, which is directly formed on the surface of the light incident side 140 and the surface of the light exit side 144 of the reflecting prism, respectively. The reflecting prism is an integrated optical element integrating the functions of collimating and deflecting the light path.

The reflective prism is an optically dense medium compared to air. Correspondingly, when the light beam emitted by the light source 10 is incident on the reflecting prism from the air, refraction occurs, which can further collimate the incident light beam.

Therefore, in this embodiment, the direction deflection of the projection light path is realized by disposing the light path deflecting part 14 on the light exit side of the light source 10 , which can condense the edge-diffused light beams.

The first direction X is perpendicular to the second direction. The first direction is, for example, a horizontal direction, and the second direction Y is, for example, a vertical direction. Alternatively, the first direction X may also be, for example, a vertical direction, and the second direction X may be, for example, a horizontal direction. The present invention does not specifically limit the first direction X and the second direction Y.

It can be understood that, in this embodiment, according to the light-emitting characteristics of the light source 10 and the optical path length required by the pair of optical structures 120 of the light beam adjusting part 12, the reflecting prism can be roughly a triangular prism or Trapezoidal prism. For example, when the required optical path is short, the surface of the light incident side 140 , the reflection surface 142 and the surface of the light exit side 144 of the reflecting prism border each other to form a triangular prism. When the required optical path is long, the surface of the incident prism 140 and the reflection surface 142 are separated by a required distance along the optical path. The reflection prism is roughly a trapezoidal prism.

The reflective prism can reflect the incident light beam toward the light exit side 144 of the optical path deflection unit 14 by utilizing the principle of total reflection. However, alternatively, in addition to the principle of total reflection, the reflective function can also be achieved by arranging a reflective material on the reflective surface 142, such as attaching a reflective film or the like.

Further, in some embodiments, the reflective surface 142 and the first direction X may also be arranged at other suitable angles, which are not limited to 45 degrees.

The reflecting prism can also be replaced by other suitable elements with the same function, and is not limited to the prism, as long as it is used to deflect the light beam emitted from the light source 10 along the first direction X by approximately 90 degrees and then project it along the second direction Y. Can.

The light beams emitted from the light source 10 do not need to be strictly limited to be along the first direction X, and may also be emitted light beams that are inclined at a certain angle to the first direction X. Accordingly, the deflection angle of the light beam is not limited to 90 degrees.

It can be understood that the optical assembly 1 may also include one or more optical elements with other functions, which may be set corresponding to the light incident side 140 or the light exit side 144 of the optical deflecting portion 14 to complement the light source 10 . The gap between the optical properties and the optical requirements to be met by the projected beam. For example, if the original light beam emitted by the light source 10 is too narrow to cover the entire pattern generating portion 16, the optical assembly 1 may further include one or more optical elements with a beam expander function to expand the beam to cover the entire area. The pattern generation unit 16 is described.

The pattern generating unit 16 is used to form the incident light beam into a pattern light beam capable of projecting a preset pattern on the object to be measured. The pattern generating unit 16 realizes the above functions by rearranging the light field of the incident light beam through the correspondingly arranged optical microstructures 163, which include but are not limited to diffractive optical patterns, microlens arrays, gratings and the like. combination.

Taking the preset pattern of irregularly distributed light spots as an example, if the light source 10 is a light-emitting array composed of a plurality of irregularly distributed light-emitting units, and the emitted light beam itself includes a plurality of irregularly distributed sub-beams, the The pattern generating unit 16 replicates the light beam groups emitted by a plurality of the irregularly distributed light-emitting units through the optical microstructure 163, and expands them within a preset expansion angle range to form an irregular distribution projected on the measured object. spot pattern. If the light beam emitted by the light source 10 is a light beam with uniform intensity distribution, the pattern generator 16 can rearrange the light beam through the optical microstructure 163 to break it up into a pattern beam capable of projecting an irregular pattern . In this embodiment, the pattern generating portion 16 is a diffractive optical element (DOE) disposed on the light-emitting side 144 of the optical deflecting portion 14 . The DOE is an independent optical element, including a transparent substrate 160 and a diffractive optical pattern formed on the transparent substrate as an optical microstructure 163 . Wherein, the irregular patterns include, for example, random, pseudo-random and quasi-periodic patterns.

Alternatively, the pattern generating unit 16 may also project a pattern beam having a preset pattern by forming a transmission pattern on a transparent substrate. For example, a pattern layer made of an opaque material is formed on the transmissive substrate, and the pattern layer is hollowed out corresponding to the position that needs to be transparent to allow the light beam to be projected to form a light beam with a predetermined pattern.

The pattern generating unit 16 is not limited to the above-mentioned embodiment, and may be other suitable structures as long as the incident light beam can be formed into a pattern light beam capable of projecting a preset pattern on the object to be measured.

In this embodiment, preferably, the path of the light beam traveling along the first direction X in the optical path deflecting portion 14 is longer than the path traveling along the second direction Y.

As shown in FIG. 2, the second embodiment of the present invention provides an optical assembly 2, which is basically the same as the optical assembly 1 in the first embodiment, and the main difference is that the beam adjustment part 22 includes an optical collimation function. A pair of optical structure patches 220 are respectively bonded on the light incident side 240 surface and the light exit side 244 surface of the reflective prism, rather than directly formed on the light incident side 240 surface and the light exit side 244 surface of the reflective prism. All-in-one structure.

In this embodiment, the reflective prism is a right-angled trapezoidal prism, wherein the inclined surface of the right-angled trapezoidal prism is used as a reflective surface. Alternatively, the reflecting prisms can also be triangular prisms or prisms of other suitable shapes, for example.

The optical structure patch 220 may be, but not limited to, an aspheric structure. As long as the optical structure patch 220 can achieve required optical functions, such as collimation or beam expansion, various optical structure patches 220 in suitable shapes are possible.

As shown in FIG. 3 , the third embodiment of the present invention provides an optical assembly 3 , which is basically the same as the optical assembly 1 in the first embodiment, the main difference is that the light beam adjusting part 32 includes a pair of independent lenses 320, respectively corresponding to the surface of the light incident side 340 and the surface of the light exit side 344 of the reflective prism. The lens 320 can be arranged at different positions along the projection light path without being directly fixed on the surface of the light-incident side 340 or the light-exit side 344 surface of the reflective prism.

In this embodiment, the reflective prism is a right-angled trapezoidal prism, wherein the inclined surface of the right-angled trapezoidal prism is used as a reflective surface. Alternatively, the reflecting prisms can also be triangular prisms or prisms of other suitable shapes, for example.

The lens 320 may be, but is not limited to, a lens with functions such as optical collimation or beam expansion. For example, the lens 320 is an aspherical lens, a spherical lens, or a lens of various other suitable shapes.

As shown in FIG. 4 , the fourth embodiment of the present invention provides an optical assembly 4 , which is basically the same as the optical assembly 3 in the third embodiment, the main difference is that the light beam adjusting part 42 includes a pair of independent lenses 420, all of which are set corresponding to the surface of the light incident side 340 of the reflective prism. The pattern generating portion 46 is an optical microstructure 463 directly formed on the surface of the light exit side 344 of the optical deflecting portion 44 . The optical microstructure 463 rearranges the light field of the incident beam to form a pattern beam that can project a preset pattern. The optical microstructures 463 include, but are not limited to, diffractive optical patterns, microlens arrays, gratings, and combinations thereof.

In this embodiment, the reflective prism is a right-angled trapezoidal prism, wherein the inclined surface of the right-angled trapezoidal prism is used as a reflective surface. Alternatively, the reflecting prisms can also be triangular prisms or prisms of other suitable shapes, for example.

The lens 420 may be, but is not limited to, a lens with functions such as optical collimation or beam expansion. The lens 420, for example, can be an aspherical lens, a spherical lens, or a lens of various other suitable shapes.

As shown in FIG. 5 , the fifth embodiment of the present invention provides an optical assembly 5 , which is basically the same as the optical assembly 4 in the fourth embodiment, with the main difference being that the beam adjusting portion 52 includes a reflective prism directly formed on the The optical structure 520 on the light incident side 540 surface. The pattern generating portion 56 is an optical microstructure 563 formed on the surface of the light exit side 544 of the optical deflecting portion 54 . The optical microstructure 563 rearranges the light field of the incident light beam to form a patterned light beam capable of projecting a preset pattern. The optical microstructures 563 include, but are not limited to, diffractive optical patterns, microlens arrays, gratings, and combinations thereof.

The optical structure 520 may be, but is not limited to, an optical structure in an aspheric shape. As long as the optical structure 520 can achieve required functions, such as optical collimation or beam expansion, various optical structures 520 in suitable shapes are possible.

It can be understood that, the light beam adjusting part 52 may further include one or more optical lenses 522 disposed corresponding to the surface of the light incident side 540 of the reflecting prism. The optical lens 522 can be set at different positions along the projection light path, so as to cooperate with the optical structure 520 formed on the surface of the light incident side 540 to achieve a preset optical adjustment effect.

As shown in FIG. 6 , the sixth embodiment of the present invention provides an optical assembly 6 , which is basically the same as the optical assembly 3 in the third embodiment, the main difference is that the optical path deflecting part 64 includes a reflecting mirror 642 . The reflection of the reflecting mirror 642 changes the direction of the projected light path so as to realize the deflection of the light path. The light beam adjusting part 62 includes a pair of independent lenses 620, which are respectively disposed corresponding to the light incident side 640 and the light output side 644 of the reflector.

The lens 620 can be, but is not limited to, an aspherical lens. As long as the lens 620 can achieve required functions, such as optical collimation or beam expansion, any suitable shape of the lens 620 is possible.

Alternatively, in other embodiments, the light beam adjusting parts 12 to 62 in the optical assemblies 1 to 6 of the above-described embodiments can also be omitted.

As shown in FIG. 7, the seventh embodiment of the present invention provides an optical assembly 7, which is basically the same as the optical assembly 1 in the first embodiment, the main difference is that the reflecting surface 742 has both the beam adjustment function and the Surface structure for reflection function. The beam adjustment function includes but is not limited to functions such as collimation or beam expansion. Therefore, the reflecting surface 742 can also realize a part of the function of the light beam adjusting part 72 while changing the direction of the projection light path, thereby reducing the number of components or the arrangement of the optical structure of the light beam adjusting part 72 . Of course, the reflection function on the reflection surface 742 for changing the projection light path can be realized by the principle of total reflection or the method of setting a reflection film layer.

Alternatively, the reflecting surface 742 may have, for example, a reflecting function but not a light beam adjusting function. Since the reflective surface 742 is a reflective curved surface, the light beams with a certain diffusion angle emitted from the light source 10 can be adjusted to be emitted in the vertical direction. Accordingly, the light beam adjusting portion 72 is entirely omitted.

As shown in FIG. 8 , the eighth embodiment of the present invention provides an optical assembly 8 , which is basically the same as the optical assembly 3 in the third embodiment, and the main difference is that the independent lens of the beam adjustment The light incident side 840 surface of the optical deflecting part 84 is provided. The pattern generating portion 86 is provided between the light flux adjusting portion 82 and the optical deflecting portion 84 . The original light beam emitted by the light source 83 is modulated by the light beam adjusting part 82 and the pattern generating part 86 in turn to form a pattern light beam capable of projecting a preset pattern, and then changes direction through the optical deflecting part 84 before being projected out.

As shown in FIG. 9, the ninth embodiment of the present invention provides an optical assembly 9, which is basically the same as the optical assembly 8 in the eighth embodiment, the main difference is that the pattern generating part 96 is formed directly on the Optical microstructures 963 on the reflective surface 942 of the optical deflector 94 . The optical microstructure 963 rearranges the light field of the incident beam to form a pattern beam that can project a preset pattern. The optical microstructures 963 include, but are not limited to, diffractive optical patterns, microlens arrays, gratings, and combinations thereof. The light beam incident on the reflection surface 942 is reflected and at the same time, the light field is rearranged under the action of the optical microstructure 963 to form a pattern light beam capable of projecting a preset pattern.

For the embodiments of FIGS. 8 and 9 , since the pattern generating part is arranged on the light-incident side of the optical deflecting part, compared with that the pattern generating part is arranged on the light-emitting side of the optical deflecting part, it is possible to further reduce the thickness of the application. The thickness of the optical module of the optical component along the second direction.

Scalable, it is also feasible to omit the corresponding light beam adjustment parts in the optical assemblies of the above embodiments. In this way, the thickness of the optical module including the optical component can also be thinned.

Further, it is also possible to add some additional elements to the optical assemblies of the above-mentioned embodiments, which shall fall within the protection scope of the present invention.

As shown in FIG. 10 , the tenth embodiment of the present invention provides an optical projection module 81 , which includes a light source 80 and the optical assembly 1 described in the first to seventh embodiments above. After the light beam emitted by the light source 80 passes through the optical assembly 1, a preset pattern is projected on the object to be measured, so as to sense the three-dimensional information of the object to be measured.

The light source 80 is a semiconductor laser. Preferably, the light source 80 is a Vertical Cavity Surface Emitting Laser (VCSEL), which can be fabricated on a semiconductor substrate 800 by a process such as photolithography or etching.

In this embodiment, the light source 80 is a single-hole wide-area VCSEL. The single-hole wide-surface type VCSEL has only one light-emitting hole, and the light-emitting aperture is larger, which is dozens of times the light-emitting aperture of a single light-emitting unit of a general array VCSEL. The light beam emitted by the single-hole wide-surface type VCSEL is modulated by the light beam adjusting part 12 and then becomes a surface light source that emits substantially parallel. The pattern generating unit 16, for example, can rearrange the uniform light field emitted by the surface light source through a correspondingly designed optical microstructure 163 to form a pattern capable of projecting an irregular pattern on the object to be measured. beam.

As shown in FIG. 11 , the eleventh embodiment of the present invention provides an optical projection module 91 , which is basically the same as the optical projection module 81 in the eighth embodiment, and the main difference is that the light sources 90 are multiple The light-emitting array composed of VCSEL light-emitting units includes a plurality of VCSEL light-emitting units 902 irregularly distributed on the same semiconductor substrate 900, and can project irregularly distributed light spot patterns. The pattern generating unit 16 , for example, can reproduce a plurality of the irregularly distributed light spot patterns through correspondingly designed optical microstructures 163 and project them on the object to be measured.

As shown in FIG. 12, the twelfth embodiment of the present invention provides an optical projection module 101, which is basically the same as the optical projection module 81 in the eighth embodiment, and the main difference is that the light sources 100 are multiple The light-emitting array composed of VCSEL light-emitting units includes a plurality of VCSEL light-emitting units 1002 formed on the same semiconductor substrate 1000 and uniformly arranged at the same interval, and can project a uniformly distributed light spot pattern. The pattern generating unit 16 breaks up the uniformly distributed light spot pattern into irregularly distributed light spot patterns through the correspondingly designed optical microstructure 163 and projects them on the object to be measured. The pattern generating unit 16, for example, can also merge the light fields of the light emitting units arranged in a preset direction with each other through the correspondingly designed optical microstructures 163 to form a regularly arranged stripe pattern.

As shown in FIGS. 13 and 14 , the thirteenth embodiment of the present invention provides an optical projection module 111 , which is basically the same as the optical projection module 81 in the eighth embodiment, and the main difference lies in the light source 110 It includes a first emitting portion 112 and a second emitting portion 114 that can control light emission independently. The first emitting part 112 emits a first light beam for forming a flood light beam with uniform light intensity distribution. The flood light beam is projected onto the measured object to identify whether the measured object is a specific object conforming to a preset characteristic. For example, the flood light beam can be used to identify whether the detected object is a human face. The second light beam emitted by the second emitting part 114 is used to form a pattern light beam for projecting a preset pattern on the measured object. The preset pattern is used to sense the three-dimensional information of the measured object. The first emitting portion 112 and the second emitting portion 114 can be formed on the same semiconductor substrate 115 to be integrated into an integral structure. In this embodiment, the wavelengths of the first light beam and the second light beam are the same, and the wavelength ranges from 750 nm to 1650 nm.

In this embodiment, the first emitting part 112 includes one or more first light-emitting bodies 1120 for emitting the first light beam. The second emitting part 114 includes one or more second light-emitting bodies 1140 for emitting a second light beam. The first light-emitting body 1120 and the second light-emitting body 1140 are formed on the same semiconductor substrate 115 . The semiconductor substrate 114 defines a first light emitting region 122 located in the middle of the semiconductor substrate 114 and a second light emitting region 102 surrounding the first light emitting region 122 . The first light-emitting bodies 1120 are uniformly distributed in the first light-emitting region 102 at the same predetermined interval. The second light-emitting bodies 1140 are irregularly arranged in the second light-emitting region 122 .

The first light-emitting body 1120 and the second light-emitting body 1140 may be semiconductor lasers. Preferably, in this embodiment, the first light-emitting body 1120 and the second light-emitting body 1140 are both VCSELs.

In this embodiment, the first light-emitting region 122 located in the middle of the semiconductor substrate 114 is rectangular. The second light-emitting area 102 is correspondingly disposed at four corners of the first light-emitting area 122 . The first light-emitting body 1120 is evenly arranged in multiple layers at the four corners of the second light-emitting region 102 along the two sides of each corner of the second light-emitting region 102 at the same interval. The first light-emitting region 122 That is, the four right-angle frame strip-shaped areas enclosed by the dotted lines in FIG. 12 and covering each right angle of the first light-emitting area 102 . The second light-emitting bodies 102 are irregularly arranged in the first light-emitting area 122, and are used to emit a second light beam with irregular light intensity distribution during lighting.

It can be understood that, the plurality of uniformly distributed first light-emitting bodies 1120 in each of the first light-emitting regions 102 can also be replaced by a single-hole wide-surface VCSEL. That is, each first light-emitting area 102 is a single-hole wide-surface VCSEL as a surface light source to emit a first light beam with uniform intensity.

The semiconductor substrate 115 is provided with a first pad 104 connected to the first light-emitting body 1120 , and the first pad 104 is used for connecting with an external circuit to control the light emission of the first light-emitting body 1120 . The semiconductor substrate 115 is provided with a second pad 124 connected to the second light-emitting body 1140 , and the second pad 124 is used for connecting with an external circuit to control the light emission of the second light-emitting body 1140 . Therefore, the first light-emitting body 1120 and the second light-emitting body 1140 can operate independently through different control signals.

Correspondingly, the image generating unit 16 includes a diffusion unit 161 and a patterning unit 162 . The diffusing portion 161 is disposed corresponding to the first light emitting area 102 of the light source structure 100 and is used for diffusing the first light beam emitted by the first light emitting body 1120 in the first light emitting area 102 to form a flood light beam with uniform light intensity distribution. The patterned portion 162 is disposed corresponding to the second light emitting area 122 of the light source structure 100, and is used for replicating a plurality of second light beams emitted by the second light emitting body 1140 in the second light emitting area 122 through the correspondingly disposed optical microstructures 163. The light beam group emitted by the irregularly distributed second light-emitting body 1140 is expanded within a preset expansion angle range to form an irregularly distributed light spot pattern projected on the object to be measured. The pattern formed by the pattern beam projected on the object to be measured will have corresponding deformation due to the change of the depth of the object to be measured. By analyzing the shape change of the preset pattern projected on the object to be measured, the Three-dimensional information of the measured object.

As shown in FIG. 15 , the fourteenth embodiment of the present invention provides a sensing device 50 , which is used for sensing spatial information of a measured object. The spatial information includes, but is not limited to, three-dimensional information on the surface of the measured object, position information of the measured object in space, size information of the measured object, and other three-dimensional information related to the measured object. The sensed spatial information of the measured object can be used to identify the measured object or to construct a three-dimensional model of the measured object.

The sensing device 50 includes the optical projection module 81 and the sensing module 500 as provided in the tenth to thirteenth embodiments above. The optical projection module 81 is used for projecting a specific light beam to the object under test for sensing and identification. The sensing module 500 is used for sensing a specific image projected by the optical projection module 81 on the object to be measured, and obtains relevant spatial information of the object to be measured by analyzing the specific image.

In this embodiment, the sensing device 50 is a 3D face recognition device that senses the three-dimensional information on the surface of the object to be measured and recognizes the identity of the object to be measured accordingly.

The specific light beam includes a flood light beam with uniform intensity and a pattern light beam that can project a preset pattern on the measured object. The sensing module 500 identifies whether the approached object to be measured is a face according to the image formed by the sensed flood light beam on the object to be measured. The sensing module 500 analyzes the three-dimensional information on the surface of the measured object according to the shape change of the preset pattern projected by the sensed pattern beam on the measured object, and performs face detection on the measured object accordingly. Department identification.

As shown in FIG. 16, the fifteenth embodiment of the present invention provides a device 60, such as a mobile phone, a notebook computer, a tablet computer, a touch interactive screen, a door, a vehicle, a robot, an automatic numerical control machine tool, and the like. The device 60 includes at least one sensing device 50 provided in the above fourteenth embodiment. The device 60 is configured to perform corresponding functions according to the sensing result of the sensing device 50 . The corresponding functions include but are not limited to any one of unlocking, paying, starting a preset application program, avoiding obstacles, identifying the user's facial expression and using deep learning technology to determine the user's mood and health status after identifying the user's identity. one or more.

In this embodiment, the sensing device 50 is a 3D face recognition device that senses the three-dimensional information on the surface of the object to be measured and recognizes the identity of the object to be measured accordingly. The device 60 is an electronic terminal such as a mobile phone, a notebook computer, a tablet computer, and a touch interactive screen equipped with the 3D face recognition device, a door, a vehicle, security check, entry and exit, and other devices that involve access rights.

Compared with the existing 3D sensing optical module, the optical assembly 1, the optical projection module 11, the sensing device 50 and the device 60 provided by the present invention partially deflect the projection light path to reduce the projection along the entire module. The thickness in the direction is conducive to the thin design of various equipment using this module.

In the description of this specification, reference to the terms "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples", etc. A particular feature, structure, material, or characteristic described in this embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection of the utility model.

Claims (12)

1. an optical assembly, is characterized in that: comprise: The beam adjustment part is used for collimating the beam; The optical path deflecting part includes a reflective surface, and deflects the transmission direction of the light beam from the first direction to the second direction through the reflection of the reflective surface, so as to reduce the thickness of the optical component in the second direction; and a pattern generating part for rearranging the light field of the light beam to form a pattern light beam capable of projecting a preset pattern; Wherein, the light beam adjusting part is located on the light incident side or/and the light exit side of the optical path deflection part, and the pattern generating part is located on the light exit side of the optical path deflection part. 2. The optical assembly of claim 1, wherein the first direction and the second direction are perpendicular. 3 . The optical assembly according to claim 1 , wherein the light beam adjusting portion is disposed on the light incident side of the optical path deflecting portion facing the light source, and the light beam adjusting portion collimates the light beam from the light source, 4 . When the collimated light beam is transmitted to the reflective surface of the optical path deflecting part, reflection occurs, and then the transmission direction of the light beam is deflected from the first direction to the second direction. 4 . The optical assembly according to claim 3 , wherein the light beam adjusting portion is further disposed between the light exit side of the optical path deflection portion and the pattern generating portion, and the light beam adjusting portion and the optical path deflecting portion are further arranged. 5 . The part is an integral structure, or the light beam adjusting part and the optical path deflecting part are separate structures. 5 . The optical assembly according to claim 1 , wherein the reflective surface deflects the beam direction from the first direction to the second direction by realizing total reflection of the light beam, or the reflective surface is provided with a reflective surface. 6 . The film layer deflects the beam direction from the first direction to the second direction through the reflection effect of the reflective film layer. 6. The optical assembly according to claim 3, wherein when the light beam adjusting part and the optical path deflecting part are separate structures, the optical path deflecting part further comprises a light incident side surface and a light exit side surface, The straight light beam enters the optical path deflecting part from the light incident side surface, and is transmitted in the first direction. When the light beam is transmitted to the reflective surface, it is reflected, and the reflected light beam is transmitted in the second direction and exits from the light beam. side surface exit; When the light beam adjusting part and the optical path deflecting part are integrally formed, the light beam is collimated by the light beam adjusting part and then propagates in the first direction in the optical path deflecting part, and the light beam is reflected when it is transmitted to the reflective surface , the reflected light beam travels in the second direction. 7 . The optical assembly of claim 6 , wherein the optical path deflecting portion comprises a trapezoidal prism or a triangular prism. 8 . 8 . The optical assembly of claim 6 , wherein the path of the light beam traveling in the first direction in the optical path deflecting portion is longer than the path traveling in the second direction. 9 . 9 . The optical assembly according to claim 1 , wherein the pattern generating part comprises any one or a combination of a diffractive optical element, a microlens array and a grating. 10 . 10. An optical projection module, characterized in that: it is used for projecting a pattern beam with a preset pattern to a measured object for sensing, comprising a light source and a light source as claimed in any one of claims 1 to 9 Optical assembly; the light source is a single-hole wide-face vertical cavity surface emitting laser (Vertical Cavity Surface Emitting Laser, VCSEL), the single-hole wide-face VCSEL is a surface light source with uniform luminous intensity, and the pattern generating part The uniform light field emitted by the light source is rearranged to form a patterned beam capable of projecting an irregular pattern; or The light source is an array VCSEL, including a plurality of VCSEL light-emitting units irregularly distributed on the same semiconductor substrate, which can project irregularly distributed light spot patterns, and the pattern generating part replicates a plurality of the irregularly distributed light-emitting units. The light spot pattern is expanded within a preset expansion angle range to form an irregularly distributed light spot pattern projected on the object to be measured; or The light source is an array type VCSEL, including a plurality of VCSEL light-emitting units formed on the same semiconductor substrate and evenly arranged at the same interval, which can project a uniformly distributed light spot pattern, and the pattern generating part generates the uniform light emitted by the light source. The light field is rearranged to form a patterned beam capable of projecting an irregular pattern; or The light source is an array type VCSEL, including a plurality of VCSEL light-emitting units formed on the same semiconductor substrate and evenly arranged at the same interval, which can project a uniformly distributed light spot pattern, and the pattern generation part can also be along a preset direction. The light fields of the arranged light-emitting units are merged with each other to form a regularly arranged stripe pattern; or The light source includes a first emitting part that emits a first light beam and a second emitting part that emits a second light beam, the first light beam is used to form a flood beam with uniform light intensity distribution, and the second light beam is used to form in the A pattern beam of a preset pattern is projected on the object to be measured, and the first emitting part and the second emitting part are formed on the same semiconductor substrate and operate independently through different control signals. 11. A sensing device, characterized in that: for sensing three-dimensional information of a measured object, it comprises an optical projection module and a sensing module as claimed in claim 10, and the sensing module uses Sensing the preset pattern projected by the optical module on the object to be measured and obtains three-dimensional information of the object to be measured by analyzing the image of the preset pattern. 12 . A device, characterized by comprising the sensing device according to claim 11 , the device performing corresponding functions according to the three-dimensional information of the measured object sensed by the sensing device. 13 .