CN214704257U - Light emission module and TOF imaging device - Google Patents
Light emission module and TOF imaging device Download PDFInfo
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- CN214704257U CN214704257U CN202120603049.1U CN202120603049U CN214704257U CN 214704257 U CN214704257 U CN 214704257U CN 202120603049 U CN202120603049 U CN 202120603049U CN 214704257 U CN214704257 U CN 214704257U
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Abstract
The utility model relates to a 3D surveys field technical field, discloses a light emission module and TOF imaging device, the light emission module is adapted to TOF imaging device, and it includes: a light source element for emitting a light beam; a scattering member; the light beam is uniformly emitted to the reducing assembly through the scattering piece, and the divergence angle of the light beam is reduced so that the light beam irradiates a preset area. The divergence angle of the light beam is reduced through the reduction assembly, the irradiation distance of the light beam is prolonged, the light beam is emitted into the preset area, unnecessary loss of the light energy of the light beam is avoided, and the detection distance of the TOF imaging device is further increased. In addition, the definition of the target object can be improved, and the TOF imaging device is favorable for imaging.
Description
Technical Field
The utility model relates to a 3D surveys field of technology technical field, concretely relates to light emission module and TOF imaging device.
Background
Conventional 2D imaging devices, such as cameras, can only acquire planar information of an object; the 3D imaging device can also acquire depth information of an object and construct a three-dimensional 3D model, so that the 3D imaging device is widely applied to the fields of industrial measurement, part modeling, medical diagnosis, security monitoring, machine vision, biological recognition, augmented reality AR, virtual reality VR and the like, and has great application value.
In the related art, laser emitted from a light source of a transmitting module of a TOF forming apparatus is projected to a target object at a specific distance, and the detection range is small.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide a light emitting module and a TOF imaging apparatus.
The utility model provides a light emission module, light emission module are adapted to TOF imaging device, the light emission module includes: a light source element for emitting a light beam; a scattering member; the light beam is uniformly emitted to the reducing assembly through the scattering piece, and the divergence angle of the light beam is reduced so that the light beam irradiates a preset area.
And the optimal mode can be realized, the device also comprises a collimating lens, and the collimating lens is arranged between the scattering piece and the reducing component.
As the best way to be achieved, the collimating lens consists of more than two single lenses.
As an achievable optimum, the light source element, the scattering element and the reducing assembly are arranged integrally.
As an optimal mode for realization, the reduction assembly comprises a first convex lens and a second convex lens, the scattering member, the first convex lens and the second convex lens are sequentially arranged at intervals, and the distance from the first convex lens to the second convex lens is smaller than the focal length of the first convex lens.
As the best mode capable of being realized, the projection display device further comprises a telescopic mechanism, wherein the telescopic mechanism is arranged between the first convex lens and the second convex lens, the orthographic projection of the first convex lens falls into the second convex lens, and the orthographic projection of the second convex lens is completely coincided with the first convex lens.
As an optimal mode for realization, the zoom-out lens comprises a first convex lens and a first concave lens, the scattering member, the first convex lens and the first concave lens are sequentially arranged at intervals,
the distance between the first concave lens and the first convex lens is smaller than the focal length of the first convex lens.
As the best mode for realizing, the optical lens system further comprises a telescopic mechanism, wherein the telescopic mechanism is arranged between the first convex lens and the second convex lens, the orthographic projection of the first convex lens falls in the first concave lens, and the orthographic projection of the first concave lens is completely coincided with the first convex lens.
The utility model also provides a TOF imaging device, TOF imaging device includes any one of the above-mentioned emission of light module.
As the best way to be achieved, a TOF camera is included, which is any one of ietf, pTOF or dTOF.
Compared with the prior art, the beneficial effects of the utility model are that:
the divergence angle of the light beam is reduced through the reduction assembly, the irradiation distance of the light beam is prolonged, the light beam is emitted into the preset area, unnecessary loss of the light energy of the light beam is avoided, and the detection distance of the TOF imaging device is further increased. In addition, the definition of the target object can be improved, and the TOF imaging device is favorable for imaging; the zoom-out lens adopting the combination of the first convex lens and the second convex lens or the zoom-out lens adopting the combination of the first convex lens and the first concave lens realizes the preset zoom-out magnification, and the zoom-out lens is small in size and convenient to carry.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of a TOF imaging apparatus according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a light emitting module according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of another light emitting module according to an embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 and 2 show a schematic structural view of a light emitting module.
A light emission module adapted for a TOF imaging device comprising: a light source 10, a diffuser 20 and a reduction assembly 30. The light source element 10 is for emitting a light beam; the scattering member 20 and the reducing assembly 30 are spaced apart from each other and located on an extending path of the light beam, the scattering member 20 is used for making the light beam uniformly irradiate the reducing assembly 30, and the reducing assembly 30 is used for reducing a divergence angle of the light beam so that the light beam irradiates to a predetermined area.
In this embodiment, the light beam directly emitted from the light source 10 may be visible light or invisible light, and when the light source is invisible light, the light source may be a laser light source such as infrared or ultraviolet light; the type of the light source can be edge-emitting laser or vertical cavity surface laser, and in order to make the volume of the light-emitting module smaller, the optimal scheme is to remotely select a vertical cavity surface laser emitter array as the light source. The light beam directly emitted from the light source element 10 has a certain divergence angle. The beam may be uniformly treated by its divergence as it passes through the diffuser element 20 so that the beam is directed uniformly toward the reduction assembly 30. The reduction assembly 30 reduces the divergence angle of the light beam and extends the irradiation distance of the light beam, so that the light beam is emitted into a preset area, the unnecessary loss of the light energy of the light beam is avoided, and the detection distance of the TOF imaging device is further increased. In addition, the definition of the target object can be improved, and the TOF imaging device is favorable for imaging.
In a preferred embodiment, the light emitting module further includes a collimating lens disposed between the diffuser 20 and the reducing assembly 30.
In this embodiment, the light emitting module includes a light source 10, a scattering member 20, a collimating lens and a reducing component 30, and the light source 10, the scattering member 20, the collimating lens and the reducing component 30 are sequentially disposed at intervals. The collimating lens adjusts the light beam with a certain divergence angle into parallel light beams, i.e., light beams passing through the collimating lens, and the light beams are emitted to the reducing assembly 30 in a mutually parallel manner. The collimating lens narrows the divergence angle of the light beam, restricts the irradiation area of the light beam, concentrates the light beam and prolongs the irradiation distance.
The collimating lens includes a plurality of single lenses.
Specifically, the collimator lens includes a first lens group and a second lens group. The first lens group comprises a first lens A, a first lens B and a first lens C, wherein the first lens A has negative refractive index and is sunken from one plane of the first lens A to the other plane to form an aspheric concave surface. The first lens element C has a positive refractive index, and is convex outward from a plane of the first lens element C to form an aspheric convex surface. The first lens B has two planes. One plane of the first lens B abuts against the plane of the first lens A, and the other plane of the first lens B abuts against the plane of the first lens C.
The second lens group comprises a second lens A and a second lens B, wherein the first lens A has positive refractive index and is convex outwards from one plane of the first lens A to form an aspheric convex surface. The second lens B has two flat surfaces. One plane of the second lens B abuts against the plane of the first lens A.
The first lens group and the second lens group are arranged oppositely, so that the aspheric convex surface of the first lens C of the first lens group is just opposite to the aspheric convex surface of the second lens A of the second lens group, after light rays sequentially pass through the first lens group and the second lens group, the light rays are parallel to each other, the light beam emission angle is reduced, and the detection distance is increased.
In a preferred embodiment, the light source device 10, the collimating lens and the diffusion member 20 are integrally formed to reduce the size, save materials, and facilitate installation.
In a preferred embodiment, the reducing assembly 30 includes a first convex lens 31 and a second convex lens 32, the scattering member 20, the first convex lens 31 and the second convex lens 32 are sequentially disposed at intervals, and a distance between the first convex lens 31 and the second convex lens 32 is smaller than a focal length of the first convex lens 31.
In this embodiment, the laser emission module includes: a light source 10, a diffuser 20, a first convex lens 31 and a second convex lens 32. The light source 10, the scattering member 20, the first convex lens 31 and the second convex lens 32 are sequentially arranged at intervals, and the distance between the first convex lens 31 and the second convex lens 32 is d1The focal length of the first convex lens 31 is f11The focal length of the second convex lens 32 is f12Wherein d is1<f11。
The light beams passing through the diffusion member 20 are emitted to the first convex lens 31, and the light beams are not parallel to each other, and the first convex lens 31 firstly reduces the angle of view of the light beams to extend the irradiation distance of the light beams, wherein the light beams are still not parallel to each other; the light beam is emitted to the second convex lens 32, the second convex lens 32 reduces the emission angle of the light beam again to further prolong the irradiation distance of the light beam so as to ensure that the light beam irradiates within a preset range; in addition, the distance from the first convex lens 31 to the second convex lens 32 is smaller than the focal length of the first convex lens 31, so that the overall length of the laser emission module can be reduced, and the TOF imaging device can be carried conveniently.
Further, the laser emission module further comprises a telescopic mechanism, and the telescopic mechanism is arranged between the first convex lens 31 and the second convex lens 32. The orthographic projection of the first convex lens 31 falls within the second convex lens 32, and the orthographic projection of the second convex lens 32 is completely coincident with the first convex lens 31. The telescopic mechanism may be an electric push rod, and the distance between the first convex lens 31 and the second convex lens 32 is adjusted by the electric push rod, so as to control the reduction magnification.
In a preferred embodiment, the zoom lens includes a first convex lens 31 and a first concave lens 33, the diffuser 20, the first convex lens 31 and the first concave lens 33 are sequentially disposed at intervals,
the distance from the first concave lens 33 to the first convex lens 31 is smaller than the focal length of the first convex lens 31.
In this embodiment, the laser emission module includes: a light source 10, a diffuser 20, a first convex lens 31 and a first concave lens 33. The light source 10, the scattering member 20, the first convex lens 31 and the first concave lens 33 are sequentially arranged at intervals, and the distance between the first convex lens 31 and the first concave lens 33 is d2The focal length of the first convex lens 31 is f11The focal length of the first concave lens 33 is f12Wherein d is2<f11。
The light beams passing through the diffusion member 20 are emitted to the first convex lens 31, and the light beams are not parallel to each other, and the first convex lens 31 firstly reduces the angle of view of the light beams to extend the irradiation distance of the light beams, wherein the light beams are still not parallel to each other; the light beam emits to the first concave lens 33, and the first concave lens 33 reduces the emission angle of the light beam again to further extend the irradiation distance of the light beam so as to ensure that the light beam irradiates within a preset range; in addition, the distance from the first convex lens 31 to the first concave lens 33 is smaller than the focal length of the first convex lens 31, so that the overall length of the laser emission module can be reduced, and the TOF imaging device can be carried conveniently.
Further, the laser emission module further comprises a telescopic mechanism, and the telescopic mechanism is arranged between the first convex lens 31 and the first concave lens 33. The orthographic projection of the first convex lens 31 falls within the first concave lens 33, and the orthographic projection of the first concave lens 33 is completely coincident with the first convex lens 31. The telescopic mechanism can be electrically pushed, and the distance between the first convex lens 31 and the first concave lens 33 is adjusted through the electric push rod, so that the reduction magnification is controlled, and the fact that the angle of field of view of the light rays passing through the first convex lens 31 can be reduced again by the first concave lens 33 is guaranteed.
It should be noted that the reduction lens may also be a convex lens, and the light source 10, the scattering element 20 and the convex lens are sequentially disposed to reduce the field angle of the light beam; a telescopic mechanism may be provided between the diffuser 20 and the convex lens to adjust the reduction magnification.
In a preferred embodiment, the zoom-out lens adopts a fresnel lens array, and a plurality of first microlens units in the fresnel lens array and a plurality of vertical cavity surface emitting lasers are arranged in a one-to-one correspondence manner, which is beneficial to reducing light interference among the plurality of VCSELs.
Or, the zoom-out lens adopts a micro-lens array, and a plurality of second micro-lens units in the micro-lens array are arranged in one-to-one correspondence with a plurality of vertical cavity surface emitting lasers, so that light interference among a plurality of VCSELs is favorably reduced.
Or, the reduction lens adopts a holographic lens array, and a plurality of third micro lens units in the holographic lens array are arranged in one-to-one correspondence with a plurality of vertical cavity surface emitting lasers, so that light interference among a plurality of VCSELs is favorably reduced.
Referring to fig. 3, the present application further provides a TOF imaging apparatus including a TOF camera 200, a main control board and the light emitting module 100. The TOF camera 200 and the light emitting module 100 are arranged on the main control board, the light emitting module is used for emitting projection light to the target, and the TOF camera 200 is used for receiving reflected light formed by the projection light reflected by the target.
The TOF camera may be any of ietf, pTOF or dTOF, widening the application range of TOF forming devices.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the disclosure herein is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the spirit of the disclosure. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (10)
1. The utility model provides a light emission module, is adapted to TOF imaging device, its characterized in that includes:
a light source element for emitting a light beam;
a scattering member; and
the reducing assembly is arranged at a distance from the scattering member and is positioned on an extending path of the light beam, the scattering member is used for enabling the light beam to be uniformly emitted to the reducing assembly, and the reducing assembly is used for reducing a divergence angle of the light beam so as to enable the light beam to irradiate a preset area.
2. The light emission module of claim 1, further comprising a collimating lens disposed between the diffuser and the reducing assembly.
3. The optical transmit module of claim 2, wherein the collimating lens is comprised of more than two einzel lenses.
4. The light emitting module of claim 1, wherein the light source element, the diffuser element and the reducing assembly are integrally formed.
5. The optical transmit module of claim 1,
the reducing assembly comprises a first convex lens and a second convex lens, the scattering piece is arranged at intervals in sequence, and the distance between the first convex lens and the second convex lens is smaller than the focal length of the first convex lens.
6. The light emitting module of claim 5, further comprising a telescopic mechanism disposed between the first convex lens and the second convex lens, wherein the orthographic projection of the first convex lens falls within the second convex lens, and the orthographic projection of the second convex lens completely coincides with the first convex lens.
7. The optical transmit module of claim 1,
the reducing component comprises a first convex lens and a first concave lens, the scattering piece, the first convex lens and the first concave lens are arranged in sequence at intervals,
the distance between the first concave lens and the first convex lens is smaller than the focal length of the first convex lens.
8. The light emission module of claim 7, further comprising a telescopic mechanism disposed between the first convex lens and the first concave lens, wherein an orthographic projection of the first convex lens falls within the first concave lens, and the orthographic projection of the first concave lens completely coincides with the first convex lens.
9. A TOF imaging apparatus comprising a light emission module according to any of claims 1 to 8.
10. The TOF imaging apparatus of claim 9 comprising a TOF camera, the TOF camera being any one of ietf, pTOF or dTOF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120603049.1U CN214704257U (en) | 2021-03-23 | 2021-03-23 | Light emission module and TOF imaging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120603049.1U CN214704257U (en) | 2021-03-23 | 2021-03-23 | Light emission module and TOF imaging device |
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| Publication Number | Publication Date |
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| CN214704257U true CN214704257U (en) | 2021-11-12 |
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| CN202120603049.1U Active CN214704257U (en) | 2021-03-23 | 2021-03-23 | Light emission module and TOF imaging device |
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| CN (1) | CN214704257U (en) |
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- 2021-03-23 CN CN202120603049.1U patent/CN214704257U/en active Active
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