CN209821513U - Direct type optical projection system - Google Patents
Direct type optical projection system Download PDFInfo
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- CN209821513U CN209821513U CN201920666213.6U CN201920666213U CN209821513U CN 209821513 U CN209821513 U CN 209821513U CN 201920666213 U CN201920666213 U CN 201920666213U CN 209821513 U CN209821513 U CN 209821513U
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Abstract
The utility model discloses a straight following formula optical projection system, it includes: a light source module configured to emit a collimated light beam; a fly-eye lens configured to: the collimated light beam is incident from the first surface of the fly-eye lens, exits from the second surface of the fly-eye lens, and is converged on the focal plane of the fly-eye lens to form lattice light on the focal plane; and the telecentric projection lens group is used for emitting the light rays emitted from the fly eye lens and penetrating the telecentric projection lens group, and the light rays emitted from the telecentric projection lens group form a speckle pattern or an area array on an imaging plane.
Description
Technical Field
The present invention relates to an optical apparatus, and more particularly to an optical projection system.
Background
3D depth vision is a brand-new technology, has appeared in consumer-grade products such as mobile phones, motion sensing games and payment, and gradually permeates into new fields such as security protection and automatic driving. With the continuous progress of the hardware end technology and the continuous optimization of the algorithm and the software level, the precision and the practicability of the 3D depth vision are greatly improved.
In the prior art, the schemes mainly used for 3D depth vision are binocular stereo vision, 3D structured light, and TOF schemes. The binocular stereo vision generally adopts two cameras to simultaneously obtain two digital images of a measured object from different angles, recovers three-dimensional geometric information of the object based on a parallax principle, and reconstructs a three-dimensional contour and a position of the object. The principle of the 3D structured light is that a diffraction light spot is emitted to an object, and a sensor receives the deformed light spot, so that depth information is judged according to the deformation of the light spot. The 3D structured light has higher precision and is suitable for short-distance information acquisition, such as functions of face recognition, face payment and the like. The TOF scheme is to continuously transmit an optical signal to a target to be measured, receive the returned optical signal by a sensor, and calculate the flight time of a series of optical signals to obtain the distance to the target to be measured.
In the scheme adopted by the 3D depth vision, although the transmitting end is not required, binocular stereo vision has the disadvantage that it is not suitable for dark environment. Both 3D structured light and TOF schemes require a transmitting end to project light onto the object to be measured.
In a projection device in the prior art, a collimated light source is provided based on a vertical cavity semiconductor laser (hereinafter referred to as VCSEL), and then a diffraction optical element (hereinafter referred to as DOE) is used to realize spot projection. However, such a projection device has the following disadvantages:
(1) the spot projected by the VCSEL + DOE projection system is unstable. The VCSEL has large thermal resistance, the main wavelength has large drift amplitude along with the temperature change when the VCSEL is driven by high power, and meanwhile, the optical design of the DOE is closely related to the wavelength, so that the stability of a projected light spot is easily influenced by the matching problem due to the large drift of the wavelength.
(2) The VCSEL + DOE projection system cannot meet the requirement for higher detection accuracy for the number of spot arrays. Due to the limitations of the collimation of the VCSEL and the element process accuracy of the DOE, only tens of thousands of points can be projected at present, which cannot meet the requirement of higher detection accuracy on the number of the point arrays.
(3) The VCSEL + DOE projection system is prone to photobio-safety issues. The VCSEL + DOE projection system adopts a direct type light path and directly forms speckles by means of textures on the surface of the DOE device. In practical applications, when the DOE surface is wet, the texture may be filled with water vapor and fail, resulting in the direct escape of laser light, which may burn human eyes.
Therefore, a new optical projection system is expected to be obtained, which can be used as a transmitting end for 3D depth vision, and when the optical projection system is adopted, the detection precision is high, the stability is good, and the defects in the prior art can be well overcome.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a straight following formula optical projection system, this straight following formula optical projection system can be stably with facula or area array project on the object to can more accurately, reflect the three-dimensional profile on object surface steadily, and this kind of straight following formula optical projection system has better safety in utilization. After the direct type optical projection system is matched with an optical sampling instrument (such as a camera) or a TOF chip for processing, the surface shape of an object can be accurately calculated by utilizing an algorithm, so that the direct type optical projection system has a good application prospect.
In order to achieve the above object, the present invention provides a direct type optical projection system, which includes:
the light source module is used for emitting collimated light beams;
a fly-eye lens comprising a first surface and a second surface, arranged to: enabling the collimated light beam to enter from the first surface, exit from the second surface, and converge on a focal plane of a fly-eye lens to form lattice light on the focal plane;
and the telecentric projection lens group is arranged to enable the dot matrix light to enter and penetrate through the telecentric projection lens group, so that the light rays emitted from the telecentric projection lens group form speckle or an area array on an imaging plane.
It should be noted that although straight following formula optical projection system adopt be straight following formula light path, but different with the projection system of VCSEL + DOE, DOE device directly forms the speckle through the diffraction of surface texture, when DOE surface receives the tide, can take place to fill up the inefficacy by steam because of its surface texture, thereby lead to laser to penetrate directly and escape, burn the danger of people's eye, and the optical surface of fly-eye lens in this case is receiving steam and influence when losing efficacy, its facula of projecting is the even facula of an illuminance, intensity is less than the dot matrix of normal during operation, therefore can not burn people's eye, thereby the safety defect problem among the prior art has been overcome.
Furthermore, straight following formula optical projection system adopt the structure nimble, the combination is various, can adjust the setting according to each embodiment's particular case. For example, the light source modules with different powers can be arranged to realize the output of collimated light beams with different powers, or different fly-eye lenses are arranged according to requirements to project different light spots, and the angle distribution of the projected speckles can be adjusted by setting and adjusting the field angle (FOV) of the telecentric projection lens group.
In some embodiments, the light source module, the fly-eye lens and the telecentric projection lens group can be arranged in one module, so that the direct type optical projection system can be conveniently and integrally installed in a required device.
Further, in the direct type optical projection system of the present invention, the light source module includes:
a light source for emitting a light beam;
a concave lens group provided on a propagation path of the light beam, the concave lens group being configured to: after the light beam entering the concave lens group passes through the concave lens group, the ray angle of the light beam is expanded;
a set of collimating lenses located at an output side of the concave lens group, a focal point of the set of collimating lenses coinciding with a virtual focal point of the concave lens group, the set of collimating lenses being arranged to: the light beams with expanded light angles can be emitted out after being emitted into the collimating lens group.
In the preferred embodiment, the concave lens group is disposed on the propagation path of the light beam, and can angularly expand the light emitted from the light source, so that the collimating lens group is uniformly filled with the light. And the collimating lens group is positioned at the output side of the concave lens group and is coaxially arranged with the concave lens group and the light source, and the collimating lens group can be designed as follows: so that the light rays entering the collimating lens group are parallel to the optical axis and output.
It should be noted that the concave lens assembly and the collimating lens assembly of the optical projection system of the present invention can be realized by using a single lens, or by using a combination of multiple lenses.
Further, in the direct illumination type optical projection system of the present invention, the light source includes an EEL laser or an LED light source.
In the technical solution of the present invention, an EEL laser or an LED may be preferably used as the light source. This is because the adoption of the EEL laser or the LED as the light source device is more mature and stable than the adoption of the VCSEL, and the defects of the prior art can be overcome, especially when the VCSEL is adopted in the prior art, the problem that the system is unstable under the high-power driving due to the wavelength thermal temperature drift effect of the VCSEL laser is solved. Based on this, the technical scheme of this scheme can also realize bigger output power, is favorable to realizing farther throw distance.
As described above, in some embodiments, in the direct-type optical projection system of the present invention, the concave lens group may include at least one concave lens, the incident surface of the concave lens on the side close to the light source is a concave curved surface, and the exit surface of the concave lens on the side far away from the light source is a concave curved surface or a plane or a convex curved surface with a curvature radius larger than that of the incident surface.
In some embodiments, the concave lens group may be formed by a concave lens, an incident surface of the concave lens close to the light source is a concave curved surface, and an exit surface of the concave lens far from the light source may be a concave curved surface or a plane or a convex curved surface with a curvature radius larger than that of the incident surface.
In an embodiment, in the direct type optical projection system of the present invention, the light source module, the fly-eye lens and the telecentric projection lens group are set as: the light axis of the collimated light beam emitted by the light source module is on the same straight line in the process of passing through the fly eye lens and the telecentric projection lens group and being emitted out of the telecentric projection lens group.
In another embodiment, the direct illumination type optical projection system of the present invention further comprises a mirror slope configured to: the direction of an optical axis of collimated light beams emitted by the light source module in the process of passing through the fly eye lens and the telecentric projection lens group and being emitted from the telecentric projection lens group is changed, so that the folding of the optical path is realized.
Further, in the direct type optical projection system of the present invention, the light source module, the fly-eye lens, the telecentric projection lens group and the reflector inclined plane are arranged as any one of the following structures:
(i) the optical axis of the light source module is perpendicular to the optical axis of the fly-eye lens, the optical axis of the fly-eye lens is collinear with the optical axis of the telecentric projection lens group, the optical axis of the light source module is parallel to the optical axis of the telecentric projection lens group and is non-collinear with the optical axis of the telecentric projection lens group, a first reflector inclined plane is arranged between the light source module and the fly-eye lens, the light source module emits collimated light beams along a first direction, the collimated light beams transmitted along the first direction are reflected by the first reflector inclined plane and then enter the fly-eye lens along a second direction, and the first direction is perpendicular to the second direction;
(ii) the optical axis of the light source module and the optical axis of the fly-eye lens are parallel to each other and arranged in a non-collinear manner, the optical axis of the fly-eye lens and the optical axis of the telecentric projection lens group are arranged in a collinear manner, the optical axis of the light source module and the optical axis of the telecentric projection lens group are parallel to each other and arranged in a non-collinear manner, a first reflector inclined surface and a second reflector inclined surface are arranged between the light source module and the fly-eye lens, the light source module emits collimated light beams along a first direction, the collimated light beams transmitted along the first direction are reflected by the first reflector inclined surface and then irradiate onto the second reflector inclined surface along a second direction, the collimated light beams are reflected by the second reflector inclined surface and then irradiate into the fly-eye lens along a third direction, the first direction and the third direction are;
(iii) the optical axis of the light source module is perpendicular to the optical axis of the fly-eye lens, the optical axis of the fly-eye lens is perpendicular to the optical axis of the telecentric projection lens group, the optical axis of the light source module and the optical axis of the telecentric projection lens group are parallel to each other and arranged in a non-collinear manner, a first reflector inclined plane is arranged between the light source module and the fly-eye lens, a second reflector inclined plane is arranged between the fly-eye lens and the telecentric projection lens group, the light source module emits collimated light beams along a first direction, the collimated light beams propagating along the first direction are reflected by the first reflector inclined plane and then enter the fly-eye lens along a second direction, light rays emitted from the fly-eye lens irradiate onto the second reflector inclined plane, the light rays irradiate onto the telecentric projection lens group along a third direction after being reflected by the second reflector inclined plane, the first direction and the third direction are perpendicular to the second.
Compared with the embodiment that the optical axis is on a straight line, the embodiment that the optical path is folded by using the reflecting mirror can make the occupied space of the whole direct illumination type optical projection system smaller, especially when the direct illumination type optical projection system of the present invention is modularly designed or integrated on a module (e.g. on the transmitting end module), the direct illumination type optical projection system can be installed on other devices, such as mobile phones, with smaller size.
Further, in the direct type optical projection system of the present invention, the mirror slope may be configured on the prism.
Further, in the direct type optical projection system of the present invention, the fly-eye lens includes a plurality of micro-units, and the micro-units are configured as at least one of a smooth curved convex lens, a binary optical diffraction relief convex lens, and a phase grating lens.
In the technical solution of the present invention, the plurality of micro-units can focus the collimated light beam into a dot matrix at the focal plane of the output side of the fly-eye lens. It should be noted that the shape of each micro-cell in the fly-eye lens may be a regular rectangle or a hexagon, or may be other regular or irregular shapes.
Further, straight following formula optical projection system in, telecentric projection mirror group is set up to its object space focal plane and fly eye lens's focal plane coincidence to make the light that jets out from telecentric projection mirror group form the speckle on the imaging surface.
In some embodiments, among the straight following formula optical projection system, the light source module is set up to launching collimated light beam, collimated light beam is kicked into from fly eye lens's first surface, jets out from fly eye lens's second surface, and the light beam convergence is in order to form the dot matrix light on focal plane on fly eye lens's focal plane, when the object space focal plane that far heart throws the mirror group and the focal plane that fly eye lens convergence beam formed coincide, the dot matrix facula that is generated by fly eye lens just can be through far heart to throw the mirror group and form the image, thereby demonstrate the speckle at the testee surface.
It should be noted that by adjusting or selecting the shape, number, and arrangement of the micro-cells of the fly-eye lens, the required arrangement of the lattice and the number of the lattice can be formed according to actual needs, and further the required speckle can be formed. In addition, the intensity of the formed speckles can be realized by changing or selecting the output power when the light source module projects the collimated light beams and/or changing and selecting the number of the dot matrixes. Meanwhile, the angular distribution of the speckles can be realized by adjusting the field angle (FOV) of the lens of the telecentric projection lens group.
Further, among the straight following formula optical projection system, still be equipped with the mask plate that modulates the speckle in fly-eye lens's focal plane department, the mask plate has printing opacity part and opaque part.
Still further, in the direct illumination type optical projection system of the present invention, the light-transmitting portion and the light-opaque portion of the mask plate are fixed, or the light-transmitting portion and the light-opaque portion of the mask plate are adjustable.
Further, in the direct type optical projection system of the present invention, when the light transmitting portion and the light non-transmitting portion of the mask are adjustable, the mask is configured as a liquid crystal panel.
That is, the modulation of the speckle can be achieved by adjusting the molecular orientation of the liquid crystal in the liquid crystal panel so that a certain portion of the mask plate assumes a transmissive state or a certain portion assumes an opaque state.
In some other embodiments of the present invention, in the direct type optical projection system of the present invention, the telecentric projection lens group is set to the second surface of the fly-eye lens located at the object focal plane, so that the light emitted from the telecentric projection lens group forms an area array on the imaging plane.
That is to say, the utility model discloses a straight following formula optical projection system not only can throw out the above speckle, can also set up in fly-eye lens's second surface department through the object space focal plane that throws the mirror group with the heart far away, and realize the even light field imaging to fly-eye lens surface to make the facula of throwing change the area array from the speckle. The area array may serve as a projection light source for the TOF scheme.
Compared with the prior art, the direct type optical projection system has the following advantages and beneficial effects:
at first, straight following formula optical projection system can realize throwing the speckle and throwing the switching between the area array through the focus that the adjustment heart far away throws the mirror group.
Secondly, straight following formula optics projection system owing to adopted fly-eye lens for when fly-eye lens's little optical curve surface receiving steam influence and became invalid, its facula of projecting out is the even facula of illuminance, its intensity is less than the dot matrix of normal during operation, therefore, can not take place the condition of the people's eye of burning, thereby overcome the safety defect problem among the prior art.
Furthermore, straight following formula optical projection system can adopt the modularized design to be convenient for install on device separately with the modular form.
In addition, the direct type optical projection system can adjust and select each component according to actual needs, for example, the light source modules with different powers can be arranged to realize the output of collimated light beams with different powers; or different speckles are projected by setting the shape, the number and the arrangement mode of the micro-units of the fly-eye lens; the angular distribution of the speckle can also be adjusted by setting the field of view (FOV) of the telecentric projection lens group.
Furthermore, in the preferred technical scheme of the utility model, it adopts EEL laser instrument or LED as light source device, this just makes direct type optical projection system than the system that adopts VCSEL is more mature stable, can overcome the unstable shortcoming of system under high-power drive that VCSEL laser instrument wavelength heat temperature drift effect leads to can realize bigger output, be favorable to realizing farther throw distance.
In addition, because direct type optical projection system described in the present invention has adopted fly-eye lens, and fly-eye lens's size and arrangement can be adjusted and selected as required. The size of the light emitting surface of the light source module can be adjusted and selected according to the size of the fly-eye lens. Therefore, theoretically, the lattice scale of speckles can be expanded as much as possible according to requirements, the requirement for increasing the number of lattices by a future high-precision 3D depth vision system can be met, and the defect that in the prior art, a DOE element is limited by the size of a VCSEL and can only realize tens of thousands of points is overcome.
Drawings
Fig. 1 is a schematic structural diagram of a direct type optical projection system according to some embodiments of the present invention.
Fig. 2 schematically shows that the direct type optical projection system of the present invention can form speckles on an image plane.
Fig. 3 schematically shows that the direct type optical projection system of the present invention can form an area array on an image plane.
Fig. 4 schematically shows an arrangement of a direct type optical projection system according to a first embodiment of the present invention.
Fig. 5 schematically shows an arrangement of a direct type optical projection system according to a second embodiment of the present invention.
Fig. 6 schematically shows an arrangement of a direct type optical projection system according to a third embodiment of the present invention.
Fig. 7 schematically shows an arrangement of a direct type optical projection system according to a fourth embodiment of the present invention.
Fig. 8 is a schematic structural diagram of a light source module in a direct-illumination optical projection system according to some embodiments of the present invention.
Fig. 9 schematically shows the optical principle of the light source module shown in fig. 8.
Fig. 10 schematically shows a structure of a single lens constituting a concave lens group in a direct type optical projection system according to an embodiment of the present invention.
Fig. 11 schematically shows a structure of a single lens constituting a concave lens group in a direct type optical projection system according to another embodiment of the present invention.
Fig. 12 schematically shows a structure of a single lens constituting a concave lens group in a direct type optical projection system according to still another embodiment of the present invention.
Fig. 13 is a schematic structural diagram of a fly-eye lens in a direct-illumination optical projection system according to some embodiments of the present invention.
Fig. 14 is a schematic diagram of a fly-eye lens in a direct-illumination optical projection system according to the present invention.
Fig. 15 schematically shows the structure of micro-cells of a fly-eye lens in a direct-illumination optical projection system according to some embodiments of the present invention.
Fig. 16 schematically shows the structure of micro-cells of a fly-eye lens in a direct illumination type optical projection system according to another embodiment of the present invention.
Fig. 17 schematically shows the structure of micro-cells of a fly-eye lens in a direct-illumination optical projection system according to further embodiments of the present invention.
Fig. 18 is a schematic structural diagram of a direct type optical projection system according to another embodiment of the present invention.
Fig. 19 schematically illustrates the working principle of the telecentric projection lens assembly in the direct illumination optical projection system according to some embodiments of the present invention.
Fig. 20 schematically shows the imaging effect of the direct type optical projection system of the present invention.
Detailed Description
The following further description of the direct illumination type optical projection system according to the present invention will be made based on the embodiments of the present invention and the accompanying drawings, but the description is not intended to limit the present invention unduly.
Fig. 1 is a schematic structural diagram of a direct type optical projection system according to the present invention.
As shown in fig. 1, the direct type optical projection system of the present invention includes: the light source module 1 is arranged to emit collimated light beams with uniform irradiance, the collimated light beams are incident from a first surface (namely an incident surface) of the fly eye lens 2, are emitted from a second surface (namely an emergent surface) of the fly eye lens 2 and are converged on a focal plane of the fly eye lens 2 to form lattice light on the focal plane, light rays emitted from the fly eye lens 2 are incident and pass through the telecentric projection lens group 3, and light rays emitted from the telecentric projection lens group 3 can form speckles or area arrays on an imaging surface.
Fig. 2 schematically shows that the direct type optical projection system of the present invention can form speckles on an image plane.
As shown in fig. 2, in some embodiments, the light source module 1 emits a collimated light beam, the collimated light beam enters from the first surface of the fly-eye lens 2 and exits from the second surface of the fly-eye lens 2, and the light beam is converged on the focal plane of the fly-eye lens 2 to form a lattice light on the focal plane, when the object focal plane of the telecentric projection lens group 3 coincides with the focal plane formed by the converging light beam of the fly-eye lens 2, the lattice light spot generated by the fly-eye lens 2 can be imaged by the telecentric projection lens group 3, so that a speckle is presented on the surface of the object to be measured or the imaging object O.
Fig. 3 schematically shows that the direct type optical projection system of the present invention can form an area array on an image plane.
In other embodiments, as shown in fig. 3, the object focal plane of the telecentric projection lens group 3 may be disposed at the second surface of the fly-eye lens 2 to realize uniform light field imaging of the second surface of the fly-eye lens 2, so that the light projected on the object to be measured or the imaging object O is transformed from speckle to an area array. The area array may serve as a projection light source for the TOF scheme.
Additionally, straight following formula optical projection system can need to set up various modes of arranging: for example, in some embodiments, the light source module 1, the fly-eye lens 2 and the telecentric projection lens group 3 may be configured as: the collimated light beam emitted from the light source module 1 has a constant propagation path while passing through the fly eye lens 2, the telecentric projection lens group 3 and exiting from the telecentric projection lens group 3 (as in the case shown in fig. 4). For another example, in some other embodiments, the mirror slope is further arranged to change the propagation path of the collimated light beam emitted from the light source module 1 during the process of passing through the fly-eye lens 2, the telecentric projection lens group 3 and exiting from the telecentric projection lens group 3 (as shown in fig. 5, 6 and 7).
The various arrangements will be described in detail below with reference to fig. 4-7.
Fig. 4 schematically shows an arrangement of a direct type optical projection system according to a first embodiment of the present invention.
As shown in fig. 4, in the first embodiment of the present invention, the optical axis of the light source module 1, the fly-eye lens 2 and the telecentric projection lens group 3 is located on the same straight line, so that the collimated light beam emitted from the light source module 1 is projected through the fly-eye lens 2 and the telecentric projection lens group 3 and is emitted from the telecentric projection lens group 3, and the optical axis is on the same straight line.
Fig. 5 schematically shows an arrangement of a direct type optical projection system according to a second embodiment of the present invention.
As shown in fig. 5, in the second embodiment of the present invention, the direct type optical projection system includes not only the light source module 1, the fly-eye lens 2, and the telecentric projection lens group 3, but also the reflector bevel 4. And the optical axis of the light source module 1 is mutually perpendicular to the optical axis of the fly-eye lens 2, the optical axis of the fly-eye lens 2 is arranged in a collinear way with the optical axis of the telecentric projection lens group 3, the optical axis of the light source module 1 is mutually perpendicular to the optical axis of the telecentric projection lens group 3, and the reflector inclined plane 4 is arranged between the light source module 1 and the fly-eye lens 2. This causes the collimated light beam emitted from the light source module 1 in the first direction S1 to be reflected by the mirror slope 4 and then to enter the fly eye lens 2 in the second direction S2 perpendicular to the first direction S1. That is, in the embodiment shown in fig. 5, the light source module 1, the fly-eye lens 2, the telecentric projection lens group 3 and the reflector bevel 4 are arranged substantially in an L-shape, which is more space-saving than the in-line arrangement shown in fig. 4.
Fig. 6 schematically shows an arrangement of a direct type optical projection system according to a third embodiment of the present invention.
As shown in fig. 6, in the third embodiment, the optical axis of the light source module 1 and the optical axis of the fly-eye lens 2 are parallel to each other and are arranged non-collinearly, the optical axis of the fly-eye lens 2 and the optical axis of the telecentric projection lens group 3 are arranged collinearly, the optical axis of the light source module 1 and the optical axis of the telecentric projection lens group 3 are parallel to each other and are arranged non-collinearly, and the first reflector inclined surface 41 and the second reflector inclined surface 42 are provided between the light source module 1 and the fly-eye lens 2. This causes the collimated light beam emitted from the light source module 1 in the first direction S1 to be reflected by the first mirror slope 41 and then to be irradiated onto the second mirror slope 42 in the second direction S2 perpendicular to the first direction S1, and then to be reflected again by the second mirror slope 42 and then to be incident on the fly eye lens 2 in the third direction S3 opposite to and parallel to the first direction S1. That is, in the embodiment shown in fig. 6, the light source module 1, the fly-eye lens 2, the telecentric projection lens group 3, and the first and second mirror slopes 41 and 42 are substantially U-shaped, which is a further space-saving arrangement than the in-line arrangement shown in fig. 4 and the L-shaped arrangement shown in fig. 5.
Fig. 7 schematically shows an arrangement of a direct type optical projection system according to a fourth embodiment of the present invention. As shown in fig. 7, in the fourth embodiment, the optical axis of the light source module 1 is perpendicular to the optical axis of the fly-eye lens 2, the optical axis of the fly-eye lens 2 is perpendicular to the optical axis of the telecentric projection lens group 3, the optical axis of the light source module 1 and the optical axis of the telecentric projection lens group 3 are parallel to each other and are not collinear, a first reflector slope 41 is disposed between the light source module 1 and the fly-eye lens 2, and a second reflector slope 42 is disposed between the fly-eye lens 2 and the telecentric projection lens group 3. This causes the collimated light beam emitted from the light source module 1 in the first direction S1 to be reflected by the first mirror inclined surface 41 and then to enter the fly eye lens 2 along the second direction S2 perpendicular to the first direction S1, and the light beam emitted from the fly eye lens 2 to be irradiated onto the second mirror inclined surface 42, reflected again by the second mirror inclined surface 42 and then to enter the telecentric projection lens group 3 along the third direction S3 parallel to and opposite to the first direction S1.
It should be noted that, besides the above four embodiments, a person skilled in the art may also arrange the optical elements involved in the present technical solution in other ways to obtain a desired optical propagation path. It should be noted that, in some embodiments, the mirror slope 4, the first mirror slope 41, and the second mirror slope 42 may be implemented by using prisms.
Fig. 8 is a schematic structural diagram of a light source module in a direct-illumination optical projection system according to some embodiments of the present invention.
Fig. 9 schematically shows the optical principle of the light source module shown in fig. 8.
As shown in fig. 8 and 9, in some embodiments of the present invention, the light source module 1 may include: a light source 11 (characterized as S in fig. 9) emitting a light beam, a concave lens group 12, and a collimator lens group 13. Wherein the concave lens group 12 is provided on a propagation path of the light beam and is configured to: after the light beam entering the concave lens group 12 passes through the concave lens group 12, the ray angle is expanded; and the collimating lens group 13 is located at the output side of the concave lens group 12, and a focal point of the collimating lens group 13 coincides with a virtual focal point S' of the concave lens group 12, so that the light beam expanded by the concave lens group 12 can be refracted into a collimated light beam by the collimating lens group 13 and then emitted from the collimating lens group 13 after entering the collimating lens group 13.
It should be noted that, in the present embodiment, the light source 11 may be an EEL laser or an LED light source.
It should be noted that the concave lens group 12 and the collimating lens group 13 in the optical projection system of the present invention can be realized by using a single lens, or by using a combination of multiple lenses. Fig. 10-12 schematically illustrate the structure of several embodiments of the single lens when the concave lens group 12 is formed by a single lens.
Fig. 10 schematically shows a structure of a single lens constituting a concave lens group in a direct type optical projection system according to an embodiment of the present invention.
As shown in fig. 10, in an embodiment of the present invention, the concave lens group 12 is formed by a concave lens, an incident surface of the concave lens on a side close to the light source is formed as a concave curved surface, and an exit surface of the concave lens on a side far from the light source is also formed as a concave curved surface.
Fig. 11 schematically shows a structure of a single lens constituting a concave lens group in a direct type optical projection system according to another embodiment of the present invention.
In another embodiment of the present invention, as shown in fig. 11, the concave lens group 12 is still formed by a concave lens, but unlike the concave lens shown in fig. 10, the exit surface of the concave lens on the side away from the light source is formed as a flat surface.
Fig. 12 schematically shows a structure of a single lens constituting a concave lens group in a direct type optical projection system according to still another embodiment of the present invention.
As shown in fig. 12, in another embodiment of the present invention, the concave lens group 12 is still formed by one concave lens, but unlike the concave lens shown in fig. 10 and 11, the exit surface of the concave lens on the side away from the light source is a convex curved surface, but the radius of curvature of the convex curved surface is larger than that of the entrance surface.
Fig. 13 is a schematic structural diagram of a fly-eye lens in a direct-illumination optical projection system according to some embodiments of the present invention.
Fig. 14 is a schematic diagram of a fly-eye lens in a direct-illumination optical projection system according to the present invention.
As shown in fig. 13, in the present embodiment, the fly-eye lens 2 may include a plurality of micro-cells 21. As shown in fig. 14, the convex surface of the micro-cell 21 faces the side (I side in fig. 14) on which the light beam is incident, so that the array formed by the micro-cell 21 can focus the collimated light beam into a lattice on the side (II side in fig. 14) of the output light beam of the fly-eye lens.
It should be noted that the shape of each of the micro-cells in the fly-eye lens 2 may be a regular rectangle (as shown in fig. 13, for example) or a hexagon, or may be other regular or irregular shapes. By adjusting or selecting the shape, number and arrangement of the micro-cells of the fly-eye lens 2, the required arrangement of the lattice and the number of the lattice can be formed according to actual needs, and further the required speckle can be formed.
Fig. 15 schematically shows the structure of the micro-unit of the fly-eye lens 2 in the direct-illumination type optical projection system according to some embodiments of the present invention.
As shown in fig. 15, in some embodiments, the micro-unit of the fly-eye lens 2 may be a convex lens with a smooth curved surface, and the incident direction of the light beam may be a plane side or a side with a micro-lens.
Fig. 16 schematically shows the structure of micro-cells of a fly-eye lens in a direct illumination type optical projection system according to another embodiment of the present invention.
In other embodiments, as shown in fig. 16, the micro-cells of the fly-eye lens 2 may be a binary optical diffraction relief convex lens, and the side on which the light beam is incident is convex as a whole, but the curve of the convex is not smooth but stepped.
Fig. 17 schematically shows the structure of micro-cells of a fly-eye lens in a direct-illumination optical projection system according to further embodiments of the present invention.
In still other embodiments, as shown in fig. 17, the micro-unit of the fly-eye lens 2 may be a phase grating lens with a periodically varying refractive index.
Fig. 18 is a schematic diagram of a direct type optical projection system according to another embodiment of the present invention.
As shown in fig. 18, the direct type optical projection system, like the embodiment shown in fig. 1, includes: light source module 1, fly eye lens 2 and telecentric projection mirror group 3, wherein, light source module 1 is set up as emitting collimated light beam, collimated light beam is incited into from the first surface of fly eye lens 2, is emerged from the second surface of fly eye lens 2, and converges at the focal plane of fly eye lens 2 in order to form the dot matrix light on the focal plane, telecentric projection mirror group 3 is then set up as: the object space focal plane of the telecentric projection lens group 3 coincides with the focal plane of the fly eye lens 2, so that the dot matrix light spots generated by the fly eye lens 2 can pass through the telecentric projection lens group 3, and the speckle is presented on the surface of the measured object.
Unlike the embodiment shown in fig. 1, in the embodiment shown in fig. 18, a mask 5 for modulating speckle is further provided at the focal plane of the fly-eye lens 2, and the mask 5 has a light-transmitting portion and a light-opaque portion. The light-transmitting part of the mask plate 5 does not change the pattern light path focused by the fly-eye lens 2, and the light-opaque part can shield the focused light at the corresponding position.
In some embodiments, the transparent portion and the opaque portion of the mask 5 are fixed, which means that the mask 5 is not adjustable, for example, a sheet with a fixed hollow pattern can be used as the mask.
However, in other embodiments, the light-transmissive and light-opaque portions of the mask 5 are adjustable. For example, the mask plate 5 may be configured as a liquid crystal panel. That is, the modulation of the speckle can be achieved by adjusting the molecular orientation of the liquid crystal in the liquid crystal panel so that a certain portion of the mask plate assumes a transmissive state or a certain portion assumes an opaque state.
Fig. 19 schematically illustrates the working principle of the telecentric projection lens assembly 3 in the direct illumination optical projection system according to the present invention in some embodiments.
As shown in fig. 19, the telecentric projection lens group 3 includes a plurality of lenses, and after the focused light beam formed by the fly eye lens 2 enters the telecentric projection lens group 3, the light paths will intersect and then focus into a corresponding light cone to project the light cone. Since the telecentric projection optics 3 are known in the art, the specific construction and operation thereof will not be described in detail herein.
Fig. 20 schematically shows the imaging effect of the direct type optical projection system of the present invention.
As shown in fig. 20, since the telecentric projection lens group 3 adopted in the present embodiment is a telecentric optical path, each light cone in the light beams projected by the telecentric projection lens group 3 has a small cone angle and is close to parallel light rays, so that the telecentric projection lens group can have a large depth of field. Therefore, adopt straight following formula optical projection system be favorable to increasing 3D formation of image's effective distance scope as 3D degree of depth vision system's projection end very much.
It should be noted that the technical solutions to be protected by the present invention are not limited to the above-mentioned several embodiments. In addition to this, the present invention is,
it should be noted that the various features and processes described in the present invention can be used independently of each other or combined in various ways. All possible combinations and sub-combinations are within the scope of the present invention. The features of the various embodiments or examples described above may be combined without conflict or conflict between each other. For example, the light source module shown in fig. 8 may be combined with the fly-eye lens 2 shown in fig. 15 to 18, and the light source module shown in fig. 8 and the fly-eye lens 2 shown in fig. 15 to 18 may be used in the embodiment shown in fig. 1 or the embodiment shown in fig. 18.
In the present specification, structures and functionality illustrated as separate components in the exemplary configurations may be implemented as a combined structure or component. Similarly, structures and functionality shown as separate components may be implemented or used as separate components. These and other variations, modifications, additions, and improvements may fall within the scope of the claims.
Although the present disclosure has been reviewed with reference to specific embodiments, various modifications and changes can be made to the embodiments without departing from the broader scope of the embodiments of the present disclosure. All modifications which would occur to one skilled in the art and which are, therefore, directly derivable or suggested by the disclosure of the present invention are intended to be within the scope of the present invention. These embodiments of the present technology may be referred to, individually or collectively, by the term "utility model" merely for convenience and without intending to voluntarily limit the scope of this application to any single disclosed aspect or concept if more than one is in fact disclosed.
The embodiments are described herein in sufficient detail to enable those skilled in the art to practice the disclosed aspects. Moreover, it will be realized that structural and logical substitutions and changes may be made by those skilled in the art without departing from the scope of the present disclosure. The description of the present invention is not to be taken in a limiting sense, and the scope of various embodiments is defined only by the appended claims, along with the full range of equivalents to which such claims are entitled.
Unless otherwise specified, conditional language words such as, inter alia, "may," "might," or "may" or other words used herein for this understanding are generally intended to convey that certain embodiments include certain features, elements, and/or steps. Thus, such conditional language does not imply that features, elements, and/or steps must be used in any way or that one or more embodiments must include a determination of such features, elements, and/or steps.
Claims (14)
1. A direct illumination optical projection system, comprising:
the light source module is used for emitting collimated light beams;
a fly-eye lens comprising a first surface and a second surface, arranged to: enabling the collimated light beam to enter from the first surface, exit from the second surface, and converge on a focal plane of a fly-eye lens to form lattice light on the focal plane;
and the telecentric projection lens group is arranged to enable the dot matrix light to enter and penetrate through the telecentric projection lens group, so that the light rays emitted from the telecentric projection lens group form speckle or an area array on an imaging plane.
2. The direct illumination type optical projection system according to claim 1, wherein the light source module comprises:
a light source for emitting a light beam;
a concave lens group provided on a propagation path of the light beam, the concave lens group being configured to: after the light beam entering the concave lens group passes through the concave lens group, the ray angle of the light beam is expanded;
a set of collimating lenses located at an output side of the concave lens group, a focal point of the set of collimating lenses coinciding with a virtual focal point of the concave lens group, the set of collimating lenses being arranged to: the light beams with expanded light angles can be emitted out after being emitted into the collimating lens group.
3. The direct illumination type optical projection system according to claim 2, wherein the light source includes an EEL laser or an LED light source.
4. The direct type optical projection system according to claim 2, wherein the concave lens group comprises at least one concave lens, an incident surface of the concave lens on a side close to the light source is a concave curved surface, and an exit surface of the concave lens on a side away from the light source is a concave curved surface or a flat surface or a convex curved surface having a radius of curvature larger than that of the incident surface.
5. A direct lit optical projection system according to claim 1 wherein the light source module, fly eye lens and telecentric projection optics are arranged to: the light source module emits collimated light beams, and the optical axes of the collimated light beams are on the same straight line in the process of passing through the fly eye lens and the telecentric projection lens group and being emitted out of the telecentric projection lens group.
6. A direct illumination optical projection system according to claim 1, further comprising a mirror ramp configured to: the light path folding device is used for changing the direction of an optical axis of collimated light beams emitted by the light source module in the process of passing through the fly eye lens and the telecentric projection lens group and being emitted from the telecentric projection lens group, so that the folding of the light path is realized.
7. A direct lit optical projection system as claimed in claim 6 wherein said light source module, fly eye lens, telecentric projection optics and mirror facets are arranged in any one of the following configurations:
(i) the optical axis of the light source module is perpendicular to that of the fly-eye lens, the optical axis of the fly-eye lens is collinear with that of the telecentric projection lens group, the optical axis of the light source module is perpendicular to that of the telecentric projection lens group, a first reflector inclined plane is arranged between the light source module and the fly-eye lens, the light source module emits collimated light beams along a first direction, the collimated light beams propagating along the first direction are reflected by the first reflector inclined plane and then enter the fly-eye lens along a second direction, and the first direction is perpendicular to the second direction;
(ii) the optical axis of the light source module and the optical axis of the fly-eye lens are parallel to each other and arranged in a non-collinear manner, the optical axis of the fly-eye lens and the optical axis of the telecentric projection lens group are arranged in a collinear manner, the optical axis of the light source module and the optical axis of the telecentric projection lens group are parallel to each other and arranged in a non-collinear manner, a first reflector inclined plane and a second reflector inclined plane are arranged between the light source module and the fly-eye lens, the light source module emits collimated light beams along a first direction, the collimated light beams propagating along the first direction are reflected by the first reflector inclined plane and then irradiate onto the second reflector inclined plane along a second direction, the collimated light beams are reflected by the second reflector inclined plane and then irradiate into the fly-eye lens along a third direction, the first direction and the third direction are both perpendicular to the second direction;
(iii) the optical axis of the light source module is vertical to the optical axis of the fly eye lens, the optical axis of the fly eye lens is vertical to the optical axis of the telecentric projection lens group, the optical axis of the light source module and the optical axis of the telecentric projection lens group are parallel and non-collinear, a first reflector inclined plane is arranged between the light source module and the fly eye lens, a second reflector inclined plane is arranged between the fly eye lens and the telecentric projection lens group, wherein the light source module emits collimated light beams along a first direction, the collimated light beams propagating along the first direction are reflected by the inclined surface of the first reflector and then enter the fly eye lens along a second direction, light rays emitted from the fly eye lens irradiate the inclined surface of the second reflector and then enter the telecentric projection lens group along a third direction after being reflected by the inclined surface of the second reflector, the first direction and the third direction are both perpendicular to the second direction, and the third direction is opposite to the first direction.
8. Direct lit optical projection system according to claim 6, wherein the mirror facets are structured on the prism.
9. The direct illumination type optical projection system according to claim 1, wherein the fly-eye lens includes a plurality of micro-units configured as at least one of a smooth curved convex lens, a binary optical diffractive relief convex lens, and a phase grating lens.
10. A direct illumination optical projection system according to any of claims 1 to 9 wherein the telecentric projection lens group is arranged such that its object focal plane coincides with the focal plane of the fly eye lens, such that the light rays emerging from the telecentric projection lens group form speckle on the image plane.
11. The direct illumination optical projection system according to claim 10, wherein a mask for modulating speckle is further provided at the focal plane of the fly-eye lens, the mask having a light-transmitting portion and a light-opaque portion.
12. The direct illumination optical projection system of claim 11, wherein the transparent portion and the opaque portion of the mask are stationary or the transparent portion and the opaque portion of the mask are adjustable.
13. The direct illumination optical projection system according to claim 12, wherein the reticle is configured as a liquid crystal panel when the light-transmitting portion and the light-non-transmitting portion of the reticle are adjustable.
14. A direct illumination optical projection system according to any of claims 1 to 9 wherein the telecentric projection optics are arranged such that the object focal plane is located at the second surface of the fly eye lens, such that the light rays emerging from the telecentric projection optics form an area array on the image plane.
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| CN110045507A (en) * | 2019-05-10 | 2019-07-23 | 深圳市光鉴科技有限公司 | A kind of straight-down negative optical projection system and optical projecting method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110045507A (en) * | 2019-05-10 | 2019-07-23 | 深圳市光鉴科技有限公司 | A kind of straight-down negative optical projection system and optical projecting method |
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