CN114002807B - Optical imaging module and scanning display device - Google Patents
Optical imaging module and scanning display device Download PDFInfo
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- CN114002807B CN114002807B CN202010736917.3A CN202010736917A CN114002807B CN 114002807 B CN114002807 B CN 114002807B CN 202010736917 A CN202010736917 A CN 202010736917A CN 114002807 B CN114002807 B CN 114002807B
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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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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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
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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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
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/103—Scanning systems having movable or deformable optical fibres, light guides or waveguides as scanning elements
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
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Abstract
The embodiment of the invention provides an optical imaging module and a scanning display device, which are used for magnifying and imaging an arc scanning image of an optical fiber scanner on a plane to realize clear imaging. The optical imaging module includes: the first lens group and the second lens group are sequentially arranged from the object side to the image side; the first lens group comprises four lenses, namely a first lens, a second lens, a third lens and a fourth lens, wherein the focal lengths of the first lens, the second lens, the third lens and the fourth lens are positive, negative and positive in sequence, and the fourth lens are arranged from an object side to an image side in sequence; the object side surface of the first lens is a concave surface, the third lens and the fourth lens are combined to form a first double-cemented lens, and the fourth lens is a double-concave lens; the second lens group comprises six lenses, namely a fifth lens, a tenth lens and a fourth lens, wherein the focal lengths of the fifth lens, the fourth lens, the fifth lens, the seventh lens and the eighth lens are sequentially arranged from the object side to the image side; the object side surface of the ninth lens is a concave surface, the image side surface of the tenth lens is a convex surface, and the ninth lens and the tenth lens are combined to form a second double-cemented lens.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to an optical imaging module and a scanning display device.
Background
With the development of optical fiber scanners, projection imaging of optical fiber scanners is an urgent problem to be solved. The imaging principle of the optical fiber scanning projection technology is as follows: the actuator drives the scanning optical fiber to perform the movement of a preset two-dimensional scanning track, and simultaneously modulates the light emitting power of the light source, and each pixel point information of the image to be displayed is projected onto an imaging area one by one, so that a projection picture is formed.
Fig. 1A and 1B are schematic structural views of a conventional optical fiber scanning projection system, wherein fig. 1B is a side view of fig. 1A. The fiber scanner projection system includes: processor 100, laser unit 110, optical fiber scanner 120, optical fiber 130, light source modulation module 140, scan driving module 150, and light source beam combining module 160. The optical fiber scanner 120 includes an actuating portion 121, an optical fiber cantilever 122, a lens 123, a scanner package 124, and a fixing member 125. The actuator 121 is secured in the scanner housing 124 by a securing member 125 and the transmission fiber 130 extends at the free end of the actuator 121 to form a fiber cantilever 122. In operation, the processor 100 controls the optical fiber scanner 120 to vibrate and scan by sending an electrical control signal to the scan driving module 150, and at the same time, the processor 100 controls the light output of the beam combining module 160 by sending an electrical control signal to the light source modulating module 140. The light source modulation module 140 outputs a light source modulation signal according to the received electric control signal to modulate the laser units 110 of one or more colors in the light source beam combining module 160, which is shown to include red (R), green (G), and blue (B) lasers; the light generated by the laser units 110 of each color in the light source beam combining module 160 is combined to generate color and gray information of each pixel point one by one, and the combined light beams emitted by the light source beam combining module are led into the optical fiber scanner through the optical fibers. In synchronization, the scan driving circuit 150 outputs a scan driving signal according to the received electrical control signal to control the optical fiber 130 in the optical fiber scanner 120 to perform a scan motion in a predetermined two-dimensional scan trajectory to scan out the light beam transmitted in the transmission optical fiber 130.
The projection objective is used for imaging a pattern on a scanning plane on its object side onto the image side of the projection objective, which is arranged at the exit end of the fiber scanner. However, since the scanning surface of the optical fiber scanner is an arc surface, and the object side (i.e., the image surface of the image source) acted by the existing lens is usually a plane, the arc surface image scanned by the optical fiber scanner cannot be imaged clearly by the existing lens.
Disclosure of Invention
The invention provides an optical imaging module and a scanning display device, which are used for solving the imaging problem of an arc-shaped scanning image surface of an optical fiber scanner.
In order to achieve the above object, in a first aspect, an embodiment of the present invention provides an optical imaging module, including a first lens group and a second lens group sequentially disposed along a common optical axis from an object side to an image side;
the first lens group comprises four lenses, namely a first lens, a second lens, a third lens and a fourth lens, wherein the focal lengths of the first lens, the second lens, the third lens and the fourth lens are positive, positive and negative in sequence, and the fourth lens are arranged from an object side to an image side in sequence; the object side surface of the first lens is a concave surface, the third lens and the fourth lens are combined to form a first double-cemented lens, and the fourth lens is a double-concave lens;
the second lens group comprises six lenses, namely a fifth lens, a tenth lens and a fourth lens, wherein the focal lengths of the fifth lens, the eighth lens, the seventh lens, the eighth lens and the eighth lens are sequentially arranged from the object side to the image side; the object side surface of the ninth lens is a concave surface, the image side surface of the tenth lens is a convex surface, and the ninth lens and the tenth lens are combined to form a second double-cemented lens.
Optionally, the second lens is a convex lens, and the third lens is a biconvex lens; the image side surface of the fifth lens element in the second lens group is convex, the object side surface of the sixth lens element is convex, the seventh lens element is biconcave, and the object side surface of the eighth lens element is concave.
Optionally, the equivalent focal length of the first lens group is F1, and the equivalent focal length of the second lens group is F2, which satisfies the relation: F2/F1 > 1.5.
Optionally, the optical imaging module meets the following conditions:
1.85<f1/f<2.26，
1.29<f2/f<1.58，
0.83<f3/f<1.01，
-0.38<f4/f<-0.31，
1.18<f5/f<1.44，
1.46<f6/f<1.78，
-0.56<f7/f<-0.46，
-1.28<f8/f<-1.05，
-2.93<f9/f<-2.39，
1.8<f10/f<2.2，
wherein f is an equivalent focal length of the optical imaging module, f1 is a focal length of the first lens, f2 is a focal length of the second lens, f3 is a focal length of the third lens, f4 is a focal length of the fourth lens, f5 is a focal length of the fifth lens, f6 is a focal length of the sixth lens, f7 is a focal length of the seventh lens, f8 is a focal length of the eighth lens, f9 is a focal length of the ninth lens, and f10 is a focal length of the tenth lens.
Optionally, the optical imaging module further satisfies the following conditions:
1.7<n1<2.0，
1.7<n2<2.0，
1.5<n3<1.7，
1.7<n4<2.0，
1.5<n5<1.8，
1.5<n6<1.8，
1.5<n7<1.8，
1.5<n8<1.8，
1.5<n9<1.8，
1.7<n10<2.0，
wherein n1 is the refractive index of the first lens, n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, n4 is the refractive index of the fourth lens, n5 is the refractive index of the fifth lens, n6 is the refractive index of the sixth lens, n7 is the refractive index of the seventh lens, n8 is the refractive index of the eighth lens, n9 is the refractive index of the ninth lens, and n10 is the refractive index of the tenth lens.
Optionally, the optical imaging module further includes: and a diaphragm coaxially arranged between the fourth lens and the fifth lens.
Optionally, the optical imaging module satisfies the following relation:
D1>D2，
wherein D1 represents a distance between an image side surface of the fourth lens and the center of the diaphragm, and D2 represents a distance between the center of the diaphragm and an object side surface of the fifth lens.
Optionally, the equivalent focal length of the optical imaging module is 4mm.
Optionally, a distance between an object side of the lens and an image side of the tenth lens is less than 3cm.
In a second aspect, an embodiment of the present invention provides a scanning display device, including an optical fiber scanner and the optical imaging module set according to the first aspect corresponding to the optical fiber scanner, where the optical fiber scanner is configured to scan and emit light of an image to be displayed, and the optical imaging module is configured to perform magnification imaging and projection on a scanning surface corresponding to the light emitted by the optical fiber scanner; the optical fiber scanner comprises an actuator and an optical fiber fixed on the actuator, wherein the part of the optical fiber exceeding the actuator forms an optical fiber cantilever, and the optical fiber cantilever is driven by the actuator to perform two-dimensional scanning.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
in the embodiment of the invention, the focal length and the surface type of each lens in ten lens groups of the optical imaging module are arranged, so that the focal power of the system can be reasonably dispersed, the aberration generated by the lens is slowed down, and the clear imaging of the arc image side is realized.
Meanwhile, the object side surface of the diaphragm is a first double-cemented lens, the object side surface of the first double-cemented lens is a biconvex lens, the image side surface of the first double-cemented lens is a biconcave lens, the aberration can be effectively corrected, and the chromatic aberration of the lens can be further reduced and the imaging quality can be improved by adding a second double-cemented lens.
Furthermore, the overall length of the optical imaging module is smaller than 3cm, the focal length of the optical imaging module can be designed to be 4mm, the imaging requirement of higher resolution can be met while the miniaturization of the system is realized, and the lens can be suitable for an optical fiber scanner with smaller fast axis scanning radius 。
Drawings
For a clearer description of embodiments of the invention or of solutions in the prior art, the drawings that are necessary for the description of the embodiments or of the prior art will be briefly described, it being evident that the drawings in the following description are only some embodiments of the invention, and that other drawings can be obtained, without inventive faculty, by a person skilled in the art from these drawings:
FIGS. 1A-1B are schematic diagrams illustrating the structure of a conventional optical fiber scanning projection system;
FIG. 2 is a schematic diagram of an optical imaging module (fast axis scanning direction) according to an embodiment of the present invention;
FIG. 3 is an imaging schematic diagram (slow axis scanning direction) of an optical imaging module according to an embodiment of the present invention;
FIG. 4 is a graph showing the MTF curve of an optical imaging module for imaging an optical fiber scanner according to an embodiment of the present invention;
FIG. 5A is a graph showing distortion of an optical imaging module in a fast axis direction when imaging an optical fiber scanner according to an embodiment of the present invention;
FIG. 5B is a graph showing the distortion of the optical imaging module in the slow axis direction when imaging the optical fiber scanner according to the embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention provides an optical imaging module and a scanning display device, which are used for imaging an arc-shaped pattern on a scanning surface on the object side of the optical imaging module onto the image side of the optical imaging module, and simultaneously, the chromatic aberration of a lens is reduced by introducing two double-cemented lenses. The arc pattern on the object side can be an arc scanning surface scanned by the optical fiber scanner shown in fig. 1A-1B or emitted by other image sources; the image side is a projection imaging surface such as a projection screen, a curtain or a wall surface.
First, a scanning display device applied to an optical imaging module in an embodiment of the present invention will be described for understanding by those skilled in the art.
The scanning display device comprises an optical fiber scanner and an optical imaging module corresponding to the optical fiber scanner, wherein the optical fiber scanner is arranged at the incident end of the optical imaging module, the optical fiber scanner is used for scanning and emitting light of an image to be displayed, and the optical imaging module is used for amplifying, clearly imaging and projecting a scanning surface corresponding to the light emitted by the optical fiber scanner. The wavelength range in which the device can function includes at least 400nm to 700nm. Wherein the optical fiber scanner comprises an optical fiber and an actuator, the optical fiber is fixed on the actuator along the extending direction of the actuator (please refer to the direction from the mark a to the mark B in fig. 1B) and the part of the optical fiber exceeding the actuator forms an optical fiber cantilever. The actuator comprises a fast shaft actuating part and a slow shaft actuating part connected with the fast shaft actuating part, for example, the fast shaft actuating part and the slow shaft actuating part are connected together by means of gluing, embedding and consolidation, adding a fixed structure and the like, or the actuator can be integrally formed; the integrally formed actuator may be in the form of a sheet or a cylinder, or a combination of both, wherein the cylinder includes a cylinder, fang Zhuzhuang, etc., such as a round bar (tube), a square bar (tube). The drive frequency of the fast axis actuating portion is greater than or equal to the drive frequency of the slow axis actuating portion. Under the action of the driving signal, the fast axis actuating part scans in the fast axis direction, the slow axis actuating part drives the fast axis actuating part to scan in the slow axis direction, and the actuator drives the optical fiber cantilever to perform two-dimensional scanning in the combined direction of the fast axis direction and the slow axis direction, such as a grid scanning mode, a spiral scanning mode and the like, so as to form an arc scanning surface (corresponding to the image surface of the optical imaging module). Preferably, the fast axis direction is the X direction and the slow axis direction is the Y direction.
In practical application, by controlling the driving signal of the optical fiber scanner, the scanning track corresponding to the optical fiber in the optical fiber scanner can be controlled. According to the embodiment of the invention, the optical fiber scanner has corresponding curvature radiuses through the motion of the fast axis and the slow axis, and the arc scanning surface formed by the motion tracks of the optical fiber light-emitting end is the object space of the optical imaging module; wherein when the curvature radius of the scanning track in the slow axis direction is "++ -infinity", the radian of the scanning track in the Y direction in the arc image side tends to be a straight line, and the scanning surface is similar to a cylindrical surface. Because the emergent light spot of the optical fiber in the optical fiber scanner is small, namely the pixel unit of the luminous surface is small, the lens is required to have higher resolution so as to realize clear imaging of the arc-shaped scanning surface emergent from the optical fiber scanner.
Next, an optical imaging module in an embodiment of the present invention is described.
Fig. 2-3 are schematic structural diagrams of an optical imaging module according to an embodiment of the present invention, where the optical imaging module may be a projection objective. The optical imaging module comprises a first lens group and a second lens group which are sequentially arranged from an object side to an image side; the first lens group comprises four lenses, namely a first lens 1 to a fourth lens 4, of which the focal lengths are positive, positive and negative in sequence, which are sequentially arranged from an object side to an image side; the object side surface of the first lens 1 is a concave surface, the third lens 3 and the fourth lens 4 are combined to form a first double-cemented lens, and the fourth lens 4 is a double-concave lens; the second lens group comprises six lenses, namely a fifth lens 5 to a tenth lens 10, of which the focal lengths are positive, negative and positive in sequence, which are sequentially arranged from an object side to an image side; the object side surface of the ninth lens element 9 is concave, the image side surface of the tenth lens element 10 is convex, and the ninth lens element 9 and the tenth lens element 10 form a second double cemented lens.
Wherein, the second lens 2 in the first lens group is a convex lens, and the third lens 3 is a biconvex lens; the image side surface of the fifth lens element 5 in the second lens group is convex, the object side surface of the sixth lens element 6 is convex, the seventh lens element 7 is a biconcave lens element, and the object side surface of the eighth lens element 8 is concave.
The third lens 3 and the fourth lens 4 included in the first doublet lens may be bonded together by an optical adhesive or the like; similarly, the ninth lens 9 and the tenth lens 10 in the second double cemented lens may be cemented together by an optical cement. In the optical imaging module, the concave surface of the first double-cemented lens faces towards the image side, the convex surface of the second double-cemented lens faces towards the image side, and the two double-cemented lenses can play roles in correcting chromatic aberration and reducing optical sensitivity in the optical imaging module.
The term "object side to image side" as used herein refers to the direction from object side 01 (i.e. the object side) to image side 02 (i.e. the image side) in fig. 2; the object side surface is convex, which means that the object side surface forms a convex shape towards the object side 01 of the optical imaging module; the object side surface is concave, which means that the object side surface faces the object side 01 to form a concave shape; the image side surface is convex, which means that the image side surface forms a convex shape towards the image side 02 of the optical imaging module; the image side surface being concave means a shape in which the image side surface is concave toward the image side 02.
In the embodiment of the present invention, if the equivalent focal length of the first lens group is F1 and the equivalent focal length of the second lens group is F2, the relationship is satisfied: F2/F1 > 1.5, so that the focal power of the system can be dispersed, and the aberration generated by each lens can be slowed down.
A diaphragm 03 may be disposed between the fourth lens element 4 and the fifth lens element 5, for reducing stray light and improving image quality, as shown in fig. 2. The type of the diaphragm 03 may be an aperture diaphragm, a Field Stop (Field Stop), a vignetting Stop, or the like. If the distance between the image side surface of the fourth lens element 4 and the center of the diaphragm 03 is D1, and the distance between the center of the diaphragm 03 and the object side surface of the fifth lens element 5 is D2, the relationship is satisfied: d1> D2, so can correct the aberration better, and make the systematic structure of the optical imaging module more compact, its optical total length is not more than 30mm, the lens volume is smaller.
In the embodiment of the invention, through setting the focal length of each lens in ten lenses in the two lens groups in the optical imaging module, the focal power of the system can be reasonably dispersed, the aberration generated by the lens is slowed down, and the clear imaging of the arc image side is realized. Meanwhile, the object side surface of the diaphragm 03 is a first double-cemented lens, the object side surface of the first double-cemented lens is a biconvex lens, the image side surface of the first double-cemented lens is a biconcave lens, the aberration can be effectively corrected, and the chromatic aberration of the lens can be further reduced and the imaging quality can be improved by adding a second double-cemented lens.
In one possible embodiment, the focal lengths of the first lens 1 to the tenth lens 10 in the optical imaging module satisfy the following relation:
1.85<f1/f<2.26，
1.29<f2/f<1.58，
0.83<f3/f<1.01，
-0.38<f4/f<-0.31，
1.18<f5/f<1.44，
1.46<f6/f<1.78，
-0.56<f7/f<-0.46，
-1.28<f8/f<-1.05，
-2.93<f9/f<-2.39，
1.8<f10/f<2.2，
wherein f is an equivalent focal length of the optical imaging module, f1 is a focal length of the first lens 1, f2 is a focal length of the second lens 2, f3 is a focal length of the third lens 3, f4 is a focal length of the fourth lens 4, f5 is a focal length of the fifth lens 5, f6 is a focal length of the sixth lens 6, f7 is a focal length of the seventh lens 7, f8 is a focal length of the eighth lens 8, f9 is a focal length of the ninth lens 9, and f10 is a focal length of the tenth lens 10.
In another possible embodiment, the refractive indices of the first lens 1 to the tenth lens 10 in the optical imaging module satisfy the following condition:
1.7<n1<2.0，
1.7<n2<2.0，
1.5<n3<1.7，
1.7<n4<2.0，
1.5<n5<1.8，
1.5<n6<1.8，
1.5<n7<1.8，
1.5<n8<1.8，
1.5<n9<1.8，
1.7<n10<2.0，
wherein n1 to n10 represent refractive indices of the first lens 1 to the tenth lens 10, respectively.
In the optical imaging module provided by the embodiment of the invention, the lens can be made of glass, plastic or other materials. Preferably, the lens element is made of glass, which increases the degree of freedom of the refractive power arrangement. The optical imaging module is mainly described by taking glass as an example, and glass with different refractive indexes can be used as different lenses in the optical imaging module.
As an embodiment of the present invention, the equivalent focal length of the whole optical imaging module is 4mm, and the preferred parameters of the radius of curvature, thickness parameter and refractive index of each lens for projection imaging on the scanning surface (for example, cylindrical surface) are shown in table 1:
TABLE 1
In table 1, the total optical length of the optical imaging module, that is, the distance between the object side and the image side of the tenth lens 10 is 28.5 mm. Meanwhile, each lens in the optical imaging module is made of glass, and is exemplified by a spherical lens, and the design of the spherical lens is beneficial to the processing of the lens; in practical applications, an aspheric lens may be used, and the related parameters or proportions still meet the foregoing requirements. The optical surface with the radius of curvature of 'infinity' in the lens is referred to as a plane, and the pitch parameter corresponding to the image space is referred to as the projection distance of the projection lens, and the projection distance can be set according to practical situations. Wherein L1 is a distance from an object side 01 (an arc-shaped scanning surface) to an object side of the first lens element 1, L2 is a thickness of the first lens element 1, and L3 is a distance between an image side of the first lens element 1 and an object side of the second lens element 2 on an optical axis; l4 is the thickness of the second lens element 2, and L5 is the distance between the image side surface of the second lens element 2 and the object side surface of the third lens element 3 on the optical axis; l6 is the thickness of the third lens element 3, L7 is the thickness of the fourth lens element 4, and L8 is the distance between the image-side surface of the fourth lens element 4 and the aperture 03 on the optical axis; l9 is the distance between the aperture stop 03 and the object side of the fifth lens element 5 on the optical axis, L10 is the thickness of the fifth lens element 5, and L11 is the distance between the image side of the fifth lens element 5 and the object side of the sixth lens element 6 on the optical axis; l12 is the thickness of the sixth lens 6; l13 is the distance between the image side of the sixth lens element 6 and the object side of the seventh lens element 7 on the optical axis, L14 is the thickness of the seventh lens element 7, and L15 is the distance between the image side of the seventh lens element 7 and the object side of the eighth lens element 8 on the optical axis; l16 is the thickness of the eighth lens element 8, L17 is the distance between the image-side surface of the eighth lens element 8 and the object-side surface of the ninth lens element 9 on the optical axis; l18 is the thickness of the ninth lens 9, L19 is the thickness of the tenth lens, L20 is the distance from the image side surface of the tenth lens 10 to the image side 02 (i.e., the projected image), and this distance is designated as infinity in the table as an example.
In the actual scanning projection process, when the optical imaging module is applied to the optical fiber scanning projection system, the light emitted from the optical fiber light emitting end in the fast axis direction is scanned through the projection lens for the imaging process, refer to the aforementioned figure 2, the imaging process of the optical beam emitted by the scanning of the optical fiber light-emitting end in the slow axis direction on the object space 01 through the projection lens is shown in figure 3, in fig. 3, the scanning track in the slow axis direction is a straight line (i.e. the optical fiber goes out the radius of curvature corresponding to the scanning trajectory of the optical end is "++++") for example.
Through testing, when the optical imaging module is adopted to project image light corresponding to a scanning surface, the graph of the optical transfer function is shown in fig. 4, and the graphs of distortion in the fast axis direction and the slow axis direction are shown in fig. 5A-5B respectively; wherein the optical transfer function graph (ModulationTransferFunction, MTF) represents the overall resolution level of an optical system, and the distortion graph represents the magnitude (percentage) of F-Tan (theta) distortion at different angles of view.
As can be seen from the MTF curves of the optical imaging module shown in fig. 4: the MTF at the center of 0.4lp/mm is larger than 0.6, and the MTF at the edge of 0.4lp/mm is larger than 0.3, so that the imaging resolution in the full field of view is good. As can be seen from the distortion curves shown in fig. 5A-5B: the distortion value of the optical system of the optical imaging module is smaller than 2%, and the distortion is good in the whole view field range, so that the optical imaging module can clearly image an arc-shaped scanning image of the optical fiber scanner, and has good imaging effect.
Of course, in practical application, the optical imaging module may further include a photosensitive element, a housing, etc., where the photosensitive element may be disposed on an image side of the optical imaging system, and the optical imaging module may be installed in the housing to form a projection objective, so that an arc image scanned and emitted by an image source (such as an optical fiber scanner) may be magnified and imaged on a plane to implement clear imaging.
The foregoing description of the preferred embodiments of the present invention is provided for illustration only and not for the purpose of limiting the invention, as long as the invention is within the scope of the invention, as may be obtained by logic analysis, reasoning or effective experiments by those skilled in the art in light of the teachings of the present invention.
In the embodiment of the invention, the focal length and the surface type of each lens in ten lens groups of the optical imaging module are arranged, so that the focal power of the system can be reasonably dispersed, the aberration generated by the lens is slowed down, and the clear imaging of the arc image side is realized. Meanwhile, the whole length of the optical imaging module is only 28.5mm, the focal length design of the optical imaging module can reach 4mm, and the miniaturization of the system can be realized while the higher resolution can be metImaging requirements and making the lens adaptable to fiber scanners with smaller fast axis scan radii 。
All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
The invention is not limited to the specific embodiments described above. The invention extends to any novel one, or any novel combination, of the features disclosed in this specification, as well as to any novel one, or any novel combination, of the steps of the method or process disclosed.
Claims (10)
1. The optical imaging module is characterized by comprising a first lens group and a second lens group which are sequentially arranged from an object side to an image side in a common optical axis manner;
the first lens group consists of four lenses, namely a first lens, a second lens, a third lens and a fourth lens, wherein the focal lengths of the first lens, the second lens, the third lens and the fourth lens are sequentially positive, negative and positive; the object side surface of the first lens is a concave surface, the third lens and the fourth lens are combined to form a first double-cemented lens, and the fourth lens is a double-concave lens;
the second lens group consists of six lenses, namely a fifth lens, a tenth lens and a fourth lens, wherein the focal lengths of the fifth lens, the positive lens, the negative lens and the positive lens are sequentially arranged from the object side to the image side; the object side surface of the ninth lens is a concave surface, the image side surface of the tenth lens is a convex surface, and the ninth lens and the tenth lens are combined to form a second double-cemented lens.
2. The optical imaging module of claim 1, wherein the second lens in the first lens group is a convex lens and the third lens is a biconvex lens; the image side surface of the fifth lens element in the second lens group is convex, the object side surface of the sixth lens element is convex, the seventh lens element is biconcave, and the object side surface of the eighth lens element is concave.
3. The optical imaging module of claim 2, wherein the equivalent focal length of the first lens group is F1 and the equivalent focal length of the second lens group is F2, which satisfies the relationship:
F2/F1＞1.5。
4. the optical imaging module of claim 3, wherein the optical imaging module satisfies the following condition:
1.85<f1/f<2.26，
1.29<f2/f<1.58，
0.83<f3/f<1.01，
-0.38<f4/f<-0.31，
1.18<f5/f<1.44，
1.46<f6/f<1.78，
-0.56<f7/f<-0.46，
-1.28<f8/f<-1.05，
-2.93<f9/f<-2.39，
1.8<f10/f<2.2，
wherein f is an equivalent focal length of the optical imaging module, f1 is a focal length of the first lens, f2 is a focal length of the second lens, f3 is a focal length of the third lens, f4 is a focal length of the fourth lens, f5 is a focal length of the fifth lens, f6 is a focal length of the sixth lens, f7 is a focal length of the seventh lens, f8 is a focal length of the eighth lens, f9 is a focal length of the ninth lens, and f10 is a focal length of the tenth lens.
5. The optical imaging module of claim 4, wherein the optical imaging module further satisfies the following condition:
1.7<n1<2.0，
1.7<n2<2.0，
1.5<n3<1.7，
1.7<n4<2.0，
1.5<n5<1.8，
1.5<n6<1.8，
1.5<n7<1.8，
1.5<n8<1.8，
1.5<n9<1.8，
1.7<n10<2.0，
wherein n1 is the refractive index of the first lens, n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, n4 is the refractive index of the fourth lens, n5 is the refractive index of the fifth lens, n6 is the refractive index of the sixth lens, n7 is the refractive index of the seventh lens, n8 is the refractive index of the eighth lens, n9 is the refractive index of the ninth lens, and n10 is the refractive index of the tenth lens.
6. The optical imaging module of any of claims 1-5, wherein the optical imaging module further comprises:
and a diaphragm coaxially arranged between the fourth lens and the fifth lens.
7. The optical imaging module of claim 6, wherein the optical imaging module satisfies the following relationship:
D1>D2，
wherein D1 represents a distance between an image side surface of the fourth lens and the center of the diaphragm, and D2 represents a distance between the center of the diaphragm and an object side surface of the fifth lens.
8. The optical imaging module of claim 7, wherein the equivalent focal length of the optical imaging module is 4mm.
9. The optical imaging module of claim 8, wherein a distance between an object side of the lens and an image side of the tenth lens is less than 3cm.
10. A scanning display device, comprising an optical fiber scanner and an optical imaging module according to any one of claims 1-9 corresponding to the optical fiber scanner, wherein the optical fiber scanner is used for scanning and emitting light of an image to be displayed, and the optical imaging module is used for amplifying, imaging and projecting a scanning surface corresponding to the light emitted by the optical fiber scanner; the optical fiber scanner comprises an actuator and an optical fiber fixed on the actuator, wherein the part of the optical fiber exceeding the actuator forms an optical fiber cantilever, and the optical fiber cantilever is driven by the actuator to perform two-dimensional scanning.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000292698A (en) * | 1999-04-02 | 2000-10-20 | Canon Inc | Zoom lens |
| CN107632376A (en) * | 2017-10-31 | 2018-01-26 | 舜宇光学(中山)有限公司 | Vision lenses |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000292698A (en) * | 1999-04-02 | 2000-10-20 | Canon Inc | Zoom lens |
| CN107632376A (en) * | 2017-10-31 | 2018-01-26 | 舜宇光学(中山)有限公司 | Vision lenses |
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