CN114594575A - Optical projection system and electronic equipment - Google Patents
Optical projection system and electronic equipment Download PDFInfo
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- CN114594575A CN114594575A CN202210344631.XA CN202210344631A CN114594575A CN 114594575 A CN114594575 A CN 114594575A CN 202210344631 A CN202210344631 A CN 202210344631A CN 114594575 A CN114594575 A CN 114594575A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 82
- 210000001747 pupil Anatomy 0.000 claims description 14
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- 238000000429 assembly Methods 0.000 abstract description 4
- 230000004075 alteration Effects 0.000 description 8
- 230000000875 corresponding effect Effects 0.000 description 8
- 239000006185 dispersion Substances 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 4
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- 230000003190 augmentative effect Effects 0.000 description 2
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/16—Optical objectives specially designed for the purposes specified below for use in conjunction with image converters or intensifiers, or for use with projectors, e.g. objectives for projection TV
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
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Abstract
The application discloses an optical projection system and an electronic device. The optical projection system includes: a light source module; the at least one scanning reflector is positioned on the light emergent side of the light source module; the scanning reflection mirror is positioned on the light incident side of the afocal assembly, the afocal assembly comprises at least two groups of lens assemblies, the focal power of the at least two groups of lens assemblies is positive, each group of lens assembly comprises at least one lens, and the light emergent surface and the light incident surface of each lens are arranged in axial symmetry around the optical axis.
Description
Technical Field
The present application relates to the field of optical devices, and more particularly, to an optical projection system and an electronic device.
Background
The head-mounted augmented reality near-to-eye display system is a display system which enables a user to experience the combination of a virtual image and an environment, wherein the virtual image is directly led into the eyes of the user through an optical projection system, or the virtual image is led into the glasses of the user through the optical projection system and a waveguide sheet.
At present, the optical sensitivity of an optical projection system is high, a lens in the optical projection system is inclined or rotated, a light beam emitted by a light source is changed rapidly, the light beam is easy to diverge and lose collimation, and the image resolution is poor.
Disclosure of Invention
An object of the present application is to provide a new technical solution for an optical projection system and an electronic device.
According to a first aspect of embodiments of the present application, there is provided an optical projection system. The optical projection system includes:
a light source module;
the at least one scanning reflector is positioned on the light emergent side of the light source module;
the scanning reflection mirror is positioned on the light incident side of the afocal assembly, the afocal assembly comprises at least two groups of lens assemblies, the focal power of the at least two groups of lens assemblies is positive, each group of lens assembly comprises at least one lens, and the light emergent surface and the light incident surface of each lens are arranged in axial symmetry around the optical axis.
Optionally, the afocal component comprises two groups of lenses, including a first group of lenses and a second group of lenses, wherein the first group of lenses is closer to the light-entrance side of the afocal component than the second group of lenses; the equivalent focal length of the first lens group is smaller than that of the second lens group.
Optionally, each group of lens groups comprises two lenses, wherein one lens has a smaller abbe number than the other lens, and the focal power of the lens with the smaller abbe number is negative.
Optionally, the two lenses comprise a first lens and a second lens, the optical powers of the first lens and the second lens being opposite.
Optionally, the optical projection system includes two scanning mirrors, one of the scanning mirrors is located at the light incident side of the afocal assembly, and the other scanning mirror is located at the light exit side of the afocal assembly; the scanning directions of the two scanning reflection mirrors are mutually orthogonal.
Optionally, the optical projection system includes a scanning mirror, the scanning mirror 2 is located on the light incident side of the afocal component, the scanning mirror has two rotating shafts, and the scanning mirror rotates along the two rotating shafts to project a two-dimensional image.
Optionally, the light source module includes: the light source group, the light beam adjusting module and the at least one third lens, wherein the light beam adjusting module is positioned on the light emergent side of the light source group so as to adjust the light beam emitted by the light source group;
the third lens is located on the light emitting side of the light beam adjusting module and transmits the light beams to the scanning reflector, and the light emitting surface and the light incident surface of the third lens are asymmetrically arranged relative to the optical axis.
Optionally, the optical projection system further includes an entrance pupil, the entrance pupil is disposed between the afocal element and the scanning mirror, and the scanning mirror is located on the light exit side of the light source module.
Optionally, the afocal assembly further includes a plane mirror group located between two adjacent lens groups.
According to a second aspect of embodiments of the present application, there is provided an electronic device comprising the optical projection system according to the first aspect.
In an embodiment of the present application, an optical projection system is provided. The light-emitting side of the scanning reflection 2 is provided with the afocal assembly, the afocal assembly comprises the lens group with positive focal power, and the lens group uses the lens with the axially symmetrical arrangement of the light-emitting surface and the light-entering surface relative to the optical axis, so that the sensitivity of the optical projection system is reduced, and the operability of the optical projection system is improved.
Other features of the present application and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic structural diagram of an optical projection system according to the present application.
Fig. 2 is a schematic structural diagram of an optical projection system according to the present application.
Fig. 3 is a schematic structural diagram of an optical projection system according to the present application.
Description of reference numerals:
1. a light source module; 10. a light source group; 101. a first light source; 102. a second light source; 103. a third light source; 11. a collimating lens group; 12. a light combining component; 121. a first light combining sheet; 122. a second light combining sheet; 123. a third light combining sheet; 13. a third lens; 2. a scanning mirror; 21. a first scanning mirror; 22. a second scanning mirror; 3. a non-coke component; 31. a first lens group; 32. a second lens group; 311. a first lens; 312. a second lens; 4. an entrance pupil; 5. and (4) an exit pupil.
Detailed Description
Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses.
Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be considered a part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the prior art, a LASER (LASER) is used as a light source of an optical projection system, which has the advantage of small size, but the diffraction phenomenon (i.e. diffraction phenomenon) is easily generated by the light beam emitted by the LASER, which affects the imaging quality and the image resolution is worse. In order to improve the imaging quality, on one hand, the size of a light spot (namely the size of a pupil) can be enlarged by adjusting the focal length of a collimating lens group in a light source module, but after the method is adopted, the area of a scanning reflector is enlarged, and after the area of the scanning reflector is enlarged, the driving difficulty of the scanning reflector is increased or the scanning frequency of the scanning reflector is limited. On the other hand, an afocal element can be disposed in the optical projection system, and the size of the light spot is enlarged by the afocal element, but in the prior art, the afocal system uses a reflective optical element containing a focal power (i.e., refractive power) and a lens with asymmetric focal power, and the direction of the lens in the afocal element is slightly rotated, so that the light beam is rapidly changed, and therefore the light beam is easy to diverge, loses collimation, and is poor in resolution, so that the sensitivity of the optical system is high, the requirement for assembly accuracy is extremely high, and the adjustment is difficult.
In view of the above technical problem, the present application provides an optical projection system, as shown in fig. 1 and 3, including: the device comprises a light source module 1, at least one scanning reflector 2 and an afocal assembly 3.
In this embodiment, at least one scanning mirror 2 is located at the light exit side of the light source module 1, and at least one scanning mirror 2 is located at the light entrance side of the afocal element 3; the afocal component 3 comprises at least two groups of lens groups, the focal power of the at least two groups of lens groups is positive, each group of lens group comprises at least one lens, and the light emergent surface and the light incident surface of each lens are arranged in axial symmetry around the optical axis.
In one example, the optical module emits a light beam, the light beam enters the scanning reflector 2 group, and enters the afocal assembly 3 after being reflected by the scanning reflector 2 of the scanning reflector 2 group, the light beam passing through the afocal assembly 3 can be directly projected to human eyes, or the light beam passing through the afocal assembly 3 is transmitted to the waveguide sheet, and the light beam is projected to the human eyes through the waveguide sheet; or the light beam passing through the afocal assembly 3 is reflected by the scanning mirror 2 and guided to the human eye.
In this embodiment, a Micro Electro Mechanical System (MEMS) is driven to rotate the scanning mirror 2 to construct a two-dimensional image, and the two-dimensional image is finally projected to the human eye through the afocal element 3.
In this embodiment, the optical lens system includes at least two groups of lens groups, the focal powers of the at least two groups of lens groups are positive, each group of lens groups includes at least one lens, and the light emergent surface and the light incident surface of each lens are arranged in axial symmetry with respect to the optical axis. That is, the surface shape of the lens in the lens assembly is a surface shape which is axisymmetric with the optical axis as the center in the effective diameter, and the light incident surface and the light emergent surface of the lens (i.e. both sides of the object image of the lens) are axisymmetric. Compared with the prior art that the afocal element 3 uses a reflective optical element with refractive power (refractive power) and a lens with asymmetric refractive power, the afocal element 3 can be composed of lenses with optical axes symmetric to reduce optical sensitivity and assembly difficulty, and the optical projection system is easy to adjust and improve imaging effect.
In an alternative embodiment, the surface shapes of the lenses in the lens group are axisymmetrically paired with respect to the optical axis, and the powers of the lenses in the lens group are axisymmetrically arranged.
In one embodiment, referring to fig. 1, 2 and 3, the afocal component 3 includes a first lens group 31 and a second lens group 32, wherein the first lens group 31 is closer to the light-incident side of the afocal component 3 than the second lens group 32; the equivalent focal length of the first lens group 31 is smaller than that of the second lens group 32.
In this embodiment, the afocal assembly 3 includes a first lens group 31 and a second lens group 32. In one example, referring to fig. 1 and 2, each of the first lens group 31 and the second lens group 32 includes two lenses. In another example, referring to fig. 3, each of the first lens group 31 and the second lens group 32 includes one lens. Wherein the number of lenses included in the first lens group 31 and the second lens group 32 may be the same or may not be the same. For example, the first lens group 31 includes one lens, and the second lens group 32 includes two lenses.
In this embodiment, the afocal assembly 3 is used to enlarge the aperture of the light beam, that is, the afocal assembly 3 is used to enlarge the size of the light spot (that is, the afocal assembly 3 is used to enlarge the size of the pupil), so as to avoid the need of enlarging the area of the scanning mirror 2 after the light beam aperture is enlarged by the light source module 1. This application afocal subassembly 3 sets up in the light-emitting side of scanning speculum 2, and as light source module 1 with parallel light transmission to scanning speculum 2, scanning speculum 2 reflection parallel light beam to parallel light beam after the reflection gets into people's eye through afocal subassembly 3 back light beam bore grow, as the image forming picture, has promoted the imaging quality. The afocal element 3 is an optical system without net divergence or net focusing of light beams, that is, the equivalent focal length of the afocal element 3 is infinite, and the emergent light is necessarily parallel light if the incident light is parallel light.
In this embodiment, whether the first lens group 31 and the second lens group 32 include one lens, two lenses, or more lenses, it is necessary that the equivalent focal length of the first lens group 31 is smaller than that of the second lens group 32, and the first lens group 31 is disposed close to the light-incident side of the afocal assembly 3 with respect to the second lens group 32. In this embodiment, the afocal assembly 3 is used to enlarge the spot size. Specifically, after the light beam passes through the afocal element 3, the afocal element 3 enlarges and images the aperture of the light beam to the position of the exit pupil 5 (the position of the exit pupil 5 corresponds to the position of the human eye), wherein the enlargement ratio of the afocal element 3 to the aperture of the light beam is determined by the ratio of the equivalent focal lengths of the two groups of lens in the afocal element 3, and the length of the afocal element 3 (i.e., the distance from the light incident side to the light exit side of the afocal element) is positively correlated with the sum of the focal lengths. In this embodiment, the equivalent focal length of the first lens assembly 31 is limited to be smaller than the equivalent focal length of the second lens assembly 32, that is, the ratio of the equivalent focal length of the first lens assembly 31 to the equivalent focal length of the second lens assembly 32 is smaller than 1, so that the aperture of the light beam incident into the afocal assembly 3 is smaller than the aperture of the light beam emitted into the afocal assembly 3, and the aperture of the light beam of the incident light beam is increased after passing through the afocal assembly 3 provided in this embodiment.
In one embodiment, referring to fig. 1 and 2, each group of lenses includes two of the lenses, wherein one lens has a smaller abbe number than the other lens, and the power of the lens having the smaller abbe number is negative.
In this embodiment, referring to fig. 1 and fig. 2, each group of lens groups includes two lenses, and the light emergent surface and the light incident surface of the two lenses are axially symmetric with respect to the optical axis. Each group of lens group comprises two lenses, wherein one lens is close to the light-in side of the afocal assembly 3, and the other lens is close to the light-out side of the afocal assembly 3. In one embodiment, the abbe number of the lens close to the light-in side of the afocal element 3 is smaller than that of the lens far away from the light-in side of the afocal element 3, wherein the power of the lens close to the light-in side of the afocal element 3 is negative; or in another embodiment, the abbe number of the lens far away from the light-in side of the afocal element 3 is smaller than that of the lens near the light-in side of the afocal element 3, wherein the optical power of the lens far away from the light-in side of the afocal element 3 is negative.
In this embodiment, to solve the refractive chromatic aberration problem, the lens group of the afocal element 3 includes at least one lens whose material is a low-dispersion coefficient. That is, one of the lenses is defined to have a smaller abbe number than the other lens, and the power of the lens having the smaller abbe number is negative to eliminate the refractive chromatic aberration. In a specific embodiment, referring to FIG. 1, the second lens 312 may be defined to have an Abbe number smaller than that of the first lens 311, i.e. the refractive index of the second lens 312 is larger than that of the first lens 311, so as to eliminate the refractive aberration problem. Specifically, the refractive chromatic aberration can be eliminated by matching a lens with a high dispersion coefficient and a lens with a low dispersion coefficient. In one example, the second lens 312 has an abbe number of 15< Vd < 35.
In an alternative embodiment, referring to fig. 3, each group of lens groups includes a lens, and the light emergent surface and the light incident surface of the lens are arranged in an optical axis symmetry. When each group of lens group includes only one lens, and the lens group in the afocal assembly 3 does not have the capability of correcting chromatic aberration, the chromatic aberration can be compensated by limiting the distance (distance along the optical axis) between the light source emitting different colors in the light source module 1 and the corresponding collimating lens. The distances between different light sources and the corresponding collimating lenses are different, and the distance difference is less than 0.3 mm.
In one example, the light source module 1 includes a first light source 101, a second light source 102 and a third light source 103, wherein the first light source 101 emits red light, the second light source 102 emits green light and the third light source 103 emits blue light.
In one embodiment, the two lenses include a first lens 311 and a second lens 312, and the optical powers of the first lens 311 and the second lens 312 are opposite.
In this embodiment, the powers of the first lens 311 and the second lens 312 are opposite, but the entire powers of the first lens group 31 and the second lens group 32 formed by combining the first lens 311 and the second lens 312 are both positive. For example, the focal power of the first lens 311 is positive and the focal power of the second lens 312 is negative, or the focal power of the first lens 311 is negative and the focal power of the second lens 312 is positive. The purpose of correcting chromatic aberration is achieved by matching different dispersion coefficients with a lens with positive focal power and a lens with negative focal power.
In a specific embodiment, each group of lens groups includes two lenses, the two lenses include a first lens 311 and a second lens 312, an abbe number of the second lens 312 is smaller than an abbe number of the first lens 311, and an optical power of the second lens 312 is negative, so that the purpose of eliminating chromatic aberration is achieved.
In one embodiment, referring to fig. 1 and 3, the optical projection system includes two scanning mirrors 2, wherein one scanning mirror 2 is located at the light incident side of the afocal module 3, and the other scanning mirror 2 is located at the light emergent side of the afocal module 3; wherein the scanning directions of the two scanning mirrors 2 are in an orthogonal relationship with each other.
In this embodiment the optical projection system comprises two scanning mirrors 2, which two scanning mirrors 2 comprise a first scanning mirror 21 and a second scanning mirror 22, as shown with reference to fig. 1 and 3. The first scanning reflector 21 is located on the light-emitting side of the light source module 1, and the afocal element 3 is located on the light-emitting side of the first scanning reflector 21 and on the light-entering side of the second scanning reflector 22.
In one example, the light source module 1 emits a parallel light beam, the parallel light beam enters the first scanning mirror 21, is still parallel after being reflected by the mirror surface of the first scanning mirror 21, passes through the afocal assembly 3, is reflected by the second scanning mirror 22, is guided to the exit pupil 5, and is projected to the human eye or the optical waveguide sheet.
In this embodiment, a micro-electromechanical system (MEMS) is driven to rotate the first scan mirror 21 to scan the beam in a first dimension, and the second scan mirror 22 is used to scan in a direction orthogonal to the first dimension to construct a two-dimensional image. Specifically, the light emitting direction of the light beam reflected by the first scanning mirror 21 is a first direction, and the light emitting direction of the light beam reflected by the second scanning mirror 22 is a second direction, where the first direction is perpendicular to the second direction. For example, the first scanning mirror 21 and the second scanning mirror 22 are both single axis scanning. In one example, the scanning mirror 2 is disposed on a base, the base and the driving device are disposed on a substrate, the driving device drives the base to rotate on the substrate, and the base is disposed on the base and can rotate along with the rotation of the base, wherein the structure of the scanning mirror 2 includes but is not limited to this, as long as the rotation of the scanning mirror 2 can be achieved.
In one embodiment, referring to fig. 2, the optical projection system includes a scanning mirror 2, the scanning mirror 2 is located on the light incident side of the afocal component 3, the scanning mirror 2 has two rotating shafts, and the scanning mirror 2 rotates along the two rotating shafts to project a two-dimensional image.
In this embodiment, only one scanning mirror 2 is included in the optical projection system. Referring to fig. 2, the scanning mirror 2 is located on the light entrance side of the afocal system.
In one example, the light source module 1 emits a parallel light beam, the parallel light beam enters the first scanning mirror 21, and is still a parallel light beam after being reflected by the mirror surface of the first scanning mirror 21, and the reflected parallel light beam is projected to the human eye or the optical waveguide sheet through the afocal assembly 3.
In this embodiment, a Micro Electro Mechanical System (MEMS) is driven to rotate the scanning mirror 2, the scanning mirror 2 has two rotation axes, the scanning mirror 2 rotates around the two rotation axes at a high speed (i.e. the scanning mirror 2 has two-axis scanning freedom), and the scanning mirror 2 can directly scan a two-dimensional picture.
In one embodiment, the light source module 1 includes: the light source module comprises a light source group 10, a light beam adjusting module and at least one third lens 13, wherein the light beam adjusting module is positioned on the light outgoing side of the light source group so as to adjust light beams emitted by the light source group; the third lens 13 is located on the light emitting side of the light beam adjusting module, the third lens 13 transmits the light beam to the scanning reflector 2, and the light emitting surface and the light incident surface of the third lens 13 are both asymmetrically arranged with respect to the optical axis.
In one embodiment, the light source group 10 includes three light sources, which are a first light source 101, a second light source 102, and a third light source 103. The first light source 101 may emit red light, the second light source 102 may emit green light, and the third light source 103 may emit blue light. Note that the first light source 101 is not limited to red light, the second light source 102 is not limited to green light, and the third light source 103 is not limited to green light.
In this embodiment, the first light source 101, the second light source 102 and the third light source 103 respectively emit light beams, the light beam adjusting module adjusts the light beams emitted by the first light source 101, the second light source 102 and the third light source 103 respectively, and the adjusted light beams are transmitted to the scanning mirror 2 through the third lens 13.
In this embodiment, the light emitting surface and the light incident surface of the third lens element 13 are disposed asymmetrically with respect to the optical axis, that is, the third lens element 13 is a lens assembly with asymmetric optical power (refractive power) to adjust the shape of the light spot and adjust the elliptical light spot into a circular light spot. Specifically, because the laser spot after passing through the collimating lens is elliptical, it needs to be adjusted to be circular, so as to avoid the phenomenon of poor resolution in the short side direction. In this embodiment, the light source module 1 includes a third lens 13, wherein in order to further adjust the shape of the light spot, the light source module 1 may further include two third lenses 13 or a plurality of third lenses 13.
In one example, the third lens element 13 with an asymmetric structure may be a cylindrical lens with a single-dimensional optical power (refractive power), wherein the single-dimensional optical power (refractive power) means that there is refractive power in only one direction and there is no refractive power in the other direction. Or a free form surface having power (refractive power) in both dimensions, or a prism in which the power in both dimensions is different.
In an alternative embodiment, the beam adjustment module includes a collimating lens group 11 and a light combining component 12, where the collimating lens group 11 includes a first collimating lens, a second collimating lens and a third collimating lens; the light combining assembly 12 includes a first light combining sheet 121, a second light combining sheet 122, and a third light combining sheet 123.
The first collimating lens is disposed corresponding to the first light source 101, and the first light combining sheet 121 is disposed corresponding to the first collimating lens. The second collimating lens is disposed corresponding to the second light source 102, and the second light combiner 122 is disposed corresponding to the second collimating lens. The third collimating lens is disposed corresponding to the third light source 103, and the third light combiner 123 is disposed corresponding to the third collimating lens. The first light source 101 emits a first light beam, and the first light beam enters the first light combiner 121 after passing through the first collimating lens; the second light source 102 emits a second light beam, and the second light beam enters the second light combiner 122 after passing through the second collimating lens; the third light source 103 emits a third light beam, and the third light beam enters the third light combiner 123 after passing through the third collimating lens. The first light beam, the second light beam and the third light beam are guided by the first light combiner 121, the second light combiner 122 and the third light combiner 123 to be coaxial, the spot shape of the adjusted first light beam, second light beam and third light beam is adjusted by the third lens 13 with asymmetric focal power (refractive power), and the light beam with the changed spot shape is transmitted to the scanning mirror 2. In one example, the first light combiner 121, the second light combiner 122, and the third light combiner 123 may be respectively composed of dichroic mirrors.
In one embodiment, the optical projection system further includes an entrance pupil 4, the entrance pupil 4 is disposed between the afocal element 3 and the scanning mirror 2, and the scanning mirror 2 is located on the light exit side of the light source module 1. The entrance pupil 4 may be an aperture stop, for example.
In one embodiment, the afocal assembly 3 further includes a set of plane mirrors (not shown) located between two adjacent lens groups. In this embodiment, the afocal element 3 further comprises a plane mirror group including a non-dioptric (refractive) reverse mirror, and the non-dioptric (refractive) reverse mirror is disposed between adjacent lens groups to achieve the purpose of zooming out the optical projection system.
According to a second aspect of embodiments of the present application, an electronic device is provided. The electronic device comprises an optical projection system as described in the first aspect. For example, electronic devices are used in near-eye displays, augmented reality, or projection systems. For example, the electronic device may be a smart headset.
In the above embodiments, the differences between the embodiments are described in emphasis, and different optimization features between the embodiments can be combined to form a better embodiment as long as the differences are not contradictory, and further description is omitted here in consideration of brevity of the text.
Although some specific embodiments of the present application have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for purposes of illustration and is not intended to limit the scope of the present application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the application is defined by the appended claims.
Claims (10)
1. An optical projection system, characterized in that the optical projection system comprises:
a light source module (1);
the scanning reflector (2) is positioned on the light emitting side of the light source module (1);
the optical lens comprises an afocal component (3), at least one scanning reflector (2) is positioned on the light incident side of the afocal component (3), the afocal component (3) comprises at least two groups of lens groups, the focal power of the lens groups is positive, each group of lens group comprises at least one lens, and the light emergent surface and the light incident surface of each lens are arranged in axial symmetry relative to the optical axis.
2. The optical projection system of claim 1, wherein the afocal assembly (3) comprises a first lens group (31) and a second lens group (32), wherein the first lens group (31) is closer to the light entry side of the afocal assembly (3) than the second lens group (32);
the equivalent focal length of the first lens group (31) is smaller than the equivalent focal length of the second lens group (32).
3. An optical projection system as claimed in claim 1 or 2, characterized in that each group of lenses comprises two of said lenses, wherein one lens has a smaller abbe number with respect to the other lens, and the power of the lens having the smaller abbe number is negative.
4. The optical projection system of claim 3, wherein the two lenses comprise a first lens (311) and a second lens (312), the optical powers of the first lens (311) and the second lens (312) being opposite.
5. The optical projection system according to claim 1, characterized in that it comprises two scanning mirrors (2), one of which (2) is located at the light entrance side of the afocal element (3) and the other (2) is located at the light exit side of the afocal element (3); the scanning directions of the two scanning reflection mirrors (2) are mutually orthogonal.
6. The optical projection system of claim 1, wherein the optical projection system comprises a scanning mirror (2), the scanning mirror (2) is located at the light incident side of the afocal assembly (3), the scanning mirror (2) has two rotating shafts, and the scanning mirror (2) rotates along the two rotating shafts to project a two-dimensional picture.
7. The optical projection system according to claim 1, wherein the light source module (1) comprises: a light source group (10), a light beam adjusting module and at least one third lens (13),
the light beam adjusting module is positioned on the light emitting side of the light source group (10) to adjust the light beam emitted by the light source group (10);
the third lens (13) is located the light-emitting side of the light beam adjusting module, the third lens (13) transmits the light beam to the scanning reflector (2), and the light-emitting surface and the light-entering surface of the third lens (13) are asymmetrically arranged about the optical axis.
8. The optical projection system according to claim 1, characterized in that the optical projection system further comprises an entrance pupil (4), the entrance pupil (4) being arranged between the afocal element (3) and the scanning mirror (2), the scanning mirror (2) being located at the exit side of the light source module (1).
9. The optical projection system of claim 1, characterized in that the afocal assembly (3) further comprises a set of plane mirrors located between two adjacent lens groups.
10. An electronic device, characterized in that the electronic device comprises an optical projection system as claimed in any one of claims 1-9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210344631.XA CN114594575A (en) | 2022-03-31 | 2022-03-31 | Optical projection system and electronic equipment |
| PCT/CN2022/101700 WO2023184753A1 (en) | 2022-03-31 | 2022-06-28 | Optical projection system and electronic device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210344631.XA CN114594575A (en) | 2022-03-31 | 2022-03-31 | Optical projection system and electronic equipment |
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| CN114594575A true CN114594575A (en) | 2022-06-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210344631.XA Pending CN114594575A (en) | 2022-03-31 | 2022-03-31 | Optical projection system and electronic equipment |
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| CN (1) | CN114594575A (en) |
| WO (1) | WO2023184753A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023184753A1 (en) * | 2022-03-31 | 2023-10-05 | 歌尔光学科技有限公司 | Optical projection system and electronic device |
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| WO2023184753A1 (en) | 2023-10-05 |
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