CN114002807A - Optical imaging module and scanning display device - Google Patents
Optical imaging module and scanning display device Download PDFInfo
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- CN114002807A CN114002807A CN202010736917.3A CN202010736917A CN114002807A CN 114002807 A CN114002807 A CN 114002807A CN 202010736917 A CN202010736917 A CN 202010736917A CN 114002807 A CN114002807 A CN 114002807A
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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 amplifying and imaging an arc-shaped scanning image of an optical fiber scanner on a plane to realize clear imaging. This optical imaging module includes: the first lens group and the second lens group are arranged in sequence from the object side to the image side in a coaxial manner; the first lens group comprises four lenses, namely a first lens, a second lens, a third lens, a fourth lens and a fourth lens, wherein the four lenses are sequentially arranged from the object side to the image side and have positive focal lengths, positive focal lengths and negative focal lengths; 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 including a fifth lens, a sixth lens, a sixth; 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 invention relates to the technical field of display, in particular to an optical imaging module and a scanning display device.
Background
With the development of fiber scanners, projection imaging of fiber scanners is a 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 move along a preset two-dimensional scanning track, the light emitting power of the light source is modulated, and information of each pixel point of an 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 diagrams of a conventional fiber scanning projection system, wherein fig. 1B is a side view of fig. 1A. The fiber scanner projection system includes: the optical fiber scanning device comprises a processor 100, a laser unit 110, a fiber scanner 120, an optical fiber 130, a light source modulation module 140, a scanning driving module 150 and a light source beam combining module 160. The fiber scanner 120 includes an actuator 121, a fiber suspension 122, a lens 123, a scanner housing 124, and a fixing member 125. The actuator 121 is fixed in the scanner package 124 by a fixing member 125, and a transmission fiber 130 extends at a free end of the actuator 121 to form a fiber suspension 122. In operation, the processor 100 controls the fiber scanner 120 to perform the vibration scanning by sending an electrical control signal to the scan driving module 150, and at the same time, the processor 100 controls the light output power of the beam combining module 160 by sending an electrical control signal to the light source modulation module 140. The light source modulation module 140 outputs a light source modulation signal according to the received electrical control signal to modulate one or more color laser units 110 in the light source beam combining module 160, which is shown to include red (R), green (G), and blue (B) three-color lasers; the light generated by the laser unit 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 beam emitted by the light source beam combining module is guided into the optical fiber scanner through the optical fiber. Synchronously, 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 scanning motion in a predetermined two-dimensional scanning trajectory to scan out the light beam transmitted in the transmission optical fiber 130.
The projection objective is for imaging a pattern on a scanning surface at its object side onto an image side of the projection objective, which is arranged at an exit end of the fiber scanner. However, since the scanning surface of the fiber scanner is a curved surface, and the object side (i.e. the image surface of the image source) acted by the conventional lens is generally a plane, the conventional lens cannot clearly image the curved image scanned by the fiber scanner.
Disclosure of Invention
The invention aims to provide 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, according to a first aspect of the present invention, an optical imaging module includes a first lens group and a second lens group coaxially disposed from an object side to an image side in order;
the first lens group comprises four lenses, namely a first lens, a second lens, a third lens and a fourth lens, wherein the four lenses are sequentially arranged from the object side to the image side, and the focal lengths of the first lens, the second lens and the fourth lens are positive, positive and negative 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 including a fifth lens, a sixth lens, a sixth lens, a sixth; 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 a convex surface, the object side surface of the sixth lens element is a convex surface, the seventh lens element is a biconcave lens element, and the object side surface of the eighth lens element is a concave surface.
Optionally, the first lens group has an equivalent focal length of F1, and the second lens group has an equivalent focal length of F2, which satisfy the following relation: F2/F1 > 1.5.
Optionally, the optical imaging module satisfies 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 element, f2 is a focal length of the second lens element, f3 is a focal length of the third lens element, f4 is a focal length of the fourth lens element, f5 is a focal length of the fifth lens element, f6 is a focal length of the sixth lens element, f7 is a focal length of the seventh lens element, f8 is a focal length of the eighth lens element, f9 is a focal length of the ninth lens element, and f10 is a focal length of the tenth lens element.
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 a refractive index of the first lens, n2 is a refractive index of the second lens, n3 is a refractive index of the third lens, n4 is a refractive index of the fourth lens, n5 is a refractive index of the fifth lens, n6 is a refractive index of the sixth lens, n7 is a refractive index of the seventh lens, n8 is a refractive index of the eighth lens, n9 is a refractive index of the ninth lens, and n10 is a refractive index of the tenth lens.
Optionally, the optical imaging module further includes: and a diaphragm disposed coaxially between the fourth lens and the fifth lens.
Optionally, the optical imaging module satisfies the following relation:
D1>D2，
wherein D1 represents the distance between the image side surface of the fourth lens and the stop center, and D2 represents the distance between the stop center and the object side surface of the fifth lens.
Optionally, the equivalent focal length of the optical imaging module is 4 mm.
Optionally, a distance between an object side of the lens barrel and an image side surface of the tenth lens is less than 3 cm.
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 corresponding to the optical scanner according to the first aspect, 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 enlarged 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 a part of the optical fiber, which exceeds 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 have at least the following technical effects or advantages:
in the embodiment of the invention, through the arrangement of the focal length and the surface type of each lens in ten lenses with the same optical axis of the two lens groups of the optical imaging module, the focal power of the system can be reasonably dispersed, the aberration generated by the lenses is reduced, and the clear imaging of an arc-shaped image space 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, aberration can be effectively corrected, and chromatic aberration of the lens can be further reduced and imaging quality can be improved by adding a second double cemented lens.
Furthermore, the whole length of the optical imaging module is less than 3cm, the focal length of the optical imaging module can reach 4mm, the imaging requirement of high resolution can be met while the miniaturization of the system is realized, and the lens can be suitable for an optical fiber scanner with a small fast axis scanning radius.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise:
fig. 1A to 1B are schematic structural diagrams of a conventional optical fiber scanning projection system;
fig. 2 is a schematic structural diagram and an imaging diagram (fast axis scanning direction) of an optical imaging module according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an optical imaging module according to an embodiment of the present invention (slow axis scanning direction);
FIG. 4 is a MTF graph of an optical fiber scanner imaged by an optical imaging module according to an embodiment of the present invention;
FIG. 5A is a diagram illustrating a distortion curve in the fast axis direction when the optical imaging module images the optical fiber scanner according to an embodiment of the present invention;
fig. 5B is a graph illustrating a distortion curve in the slow axis direction when the optical imaging module images the optical fiber scanner according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention provides an optical imaging module and a scanning display device, which are used to image an arc pattern on a scanning surface of an object side of the optical imaging module onto an image side of the optical imaging module, and reduce chromatic aberration of a lens by introducing two double cemented lenses. The object-side arc-shaped pattern may be an arc-shaped scanning surface scanned by the optical fiber scanner shown in fig. 1A-1B or emitted from another image source; 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 the optical imaging module in the embodiment of the present invention is described for a person skilled in the art to understand.
The scanning display device comprises an optical fiber scanner and an optical imaging module corresponding to the optical fiber scanner, wherein the optical scanner is arranged at an 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 at least comprises 400nm-700 nm. The optical fiber scanner includes 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 mark a to mark B in fig. 1B), and the part of the optical fiber beyond the actuator forms a fiber cantilever. The actuator comprises a fast-axis actuating part and a slow-axis actuating part connected with the fast-axis actuating part, wherein the fast-axis actuating part and the slow-axis actuating part are connected together by gluing, embedding and fixing, adding a fixed structure and the like, or the actuator can be integrally formed; the shape of the integrally formed actuator can be a sheet shape, a column shape, or a combination of the two, wherein the column shape includes a cylindrical shape and a square column shape, such as a round rod (tube) and a square rod (tube). The driving frequency of the fast axis actuating part is more than or equal to that of the slow axis actuating part. Under the action of a driving signal, the fast axis actuating part scans and moves in the fast axis direction, the slow axis actuating part drives the fast axis actuating part to scan and move in the slow axis direction, and the actuator drives the optical fiber cantilever to perform two-dimensional scanning and moving in the synthetic 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 that an arc-shaped scanning surface (corresponding to an image surface of the optical imaging module) is formed. Preferably, the fast axis direction is the X direction and the slow axis direction is the Y direction.
In practical application, the scanning track corresponding to the optical fiber in the optical fiber scanner can be controlled by controlling the driving signal of the optical fiber scanner. In the embodiment of the invention, the optical fiber scanner moves through the fast and slow axes, the scanning tracks in the fast axis direction and the slow axis direction respectively have corresponding curvature radiuses, and the arc-shaped scanning surface correspondingly formed by the movement track of the light outlet end of the optical fiber is the object space of the optical imaging module; when the curvature radius of the scanning track in the slow axis direction is "+ ∞", it is shown that the radian of the scanning track in the Y direction in the arc-shaped image space tends to a straight line, and the scanning surface is similar to a cylindrical surface at this time. Because the light-emitting facula of the optical fiber in the optical fiber scanner is small, namely the pixel unit of the light-emitting surface is small, the lens is required to have higher resolution so as to realize clear imaging of the emergent arc-shaped scanning surface of the optical fiber scanner.
Next, an optical imaging module according to an embodiment of the present invention will be 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 coaxially arranged from an object side to an image side in sequence; the first lens group comprises four lenses, namely a first lens 1 to a fourth lens 4, wherein the four lenses are sequentially arranged from an object side to an image side, and the focal lengths of the four lenses are positive, positive and negative; 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 including a fifth lens 5 to a tenth lens 10, wherein the six lenses are sequentially arranged from the object side to the image side and have positive, negative and positive focal lengths; the object side surface of the ninth lens element 9 is a concave surface, the image side surface of the tenth lens element 10 is a convex surface, and the ninth lens element 9 and the tenth lens element 10 are combined to form a second cemented doublet.
The second lens 2 in the first lens group is a convex lens, and the third lens 3 in the first lens group 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 biconcave, 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 cemented doublet may be bonded together by an optical cement or the like; similarly, the ninth lens 9 and the tenth lens 10 of the second doublet lens may also be bonded together by an optical cement. In the optical imaging module, the concave surface of the first cemented doublet faces the image side, and the convex surface of the second cemented doublet faces the image side.
The term "object side to image side" refers to the direction from the object side 01 (i.e. the object side) to the image side 02 (i.e. the image side) in fig. 2; the object side surface is a convex surface, which means that the object side surface faces the object space 01 of the optical imaging module to form a convex shape; the object side surface is a concave surface, which means that the object side surface is concave towards the object space 01; the image side surface is convex, and is in a convex shape towards the image space 02 of the optical imaging module; the image side surface is concave, and is a shape in which the image side surface is concave toward the image side 02.
In the embodiment of the present invention, the equivalent focal length of the first lens group is F1, and the equivalent focal length of the second lens group is F2, which satisfy the following relation: F2/F1 is more than 1.5, so that the optical power of the system can be dispersed, and the aberration generated by each lens is relieved.
An aperture stop 03 may be disposed between the fourth lens element 4 and the fifth lens element 5 for reducing stray light and improving image quality, which is also shown in fig. 2. The kind of the diaphragm 03 may be an aperture diaphragm, a Field diaphragm (Field Stop), a vignetting diaphragm, or the like. If the distance between the image side surface of the fourth lens 4 and the center of the stop 03 is D1, and the distance between the center of the stop 03 and the object side surface of the fifth lens 5 is D2, the following relations are satisfied: d1> D2, so can correct the aberration better, and make the system structure of the optical imaging die set more compact, its optical total length does not exceed 30mm, the lens volume is smaller.
In the embodiment of the invention, the focal length of each lens in ten lenses of the two lens groups in the optical imaging module is set, so that the focal power of the system can be reasonably dispersed, the aberration generated by the lenses is reduced, and clear imaging of an arc-shaped image space 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, and the image side surface of the first double cemented lens is a biconcave lens, so that aberration can be effectively corrected.
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 relations:
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 element 1, f2 is a focal length of the second lens element 2, f3 is a focal length of the third lens element 3, f4 is a focal length of the fourth lens element 4, f5 is a focal length of the fifth lens element 5, f6 is a focal length of the sixth lens element 6, f7 is a focal length of the seventh lens element 7, f8 is a focal length of the eighth lens element 8, f9 is a focal length of the ninth lens element 9, and f10 is a focal length of the tenth lens element 10.
In another possible embodiment, the refractive indexes of the first lens 1 to the tenth lens 10 in the optical imaging module satisfy 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，
where 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 material of the lens can be glass, plastic or other materials. Preferably, the lens is made of glass, so that the degree of freedom of the refractive power configuration can be increased. The optical imaging module is mainly described by taking glass as an example of the lens in the optical imaging module, and glass with different refractive indexes can be adopted for different lenses in the optical imaging module.
In one embodiment of the present invention, the optical imaging module has an equivalent focal length of 4mm, and preferred parameters of the curvature radius, thickness parameter and refractive index of each lens for projection imaging on a scanning surface (taking a cylindrical surface as an example) are shown in table 1:
TABLE 1
In table 1, take the total optical length of the optical imaging module, i.e. the distance between the object space and the image side surface of the tenth lens 10 as 28.5mm as an example. Meanwhile, taking the optical imaging module as an example that all lenses are made of glass and are all ball lenses, the design of the ball lenses is beneficial to processing the lenses; in practice, aspheric lenses may also be used, with the relevant parameters or proportions still satisfying the foregoing. The optical surface with "infinite" curvature radius in the lens is a plane, and the distance parameter corresponding to the image space is the projection distance of the projection lens, and the projection distance can be set according to the actual situation. Wherein, L1 is the distance from the object space 01 (arc scanning surface) to the object side surface of the first lens 1, L2 is the thickness of the first lens 1, and L3 is the distance between the image side surface of the first lens 1 and the object side surface of the second lens 2 on the optical axis; l4 is the thickness of the second lens 2, and L5 is the distance between the image side surface of the second lens 2 and the object side surface of the third lens 3 on the optical axis; l6 is the thickness of the third lens 3, L7 is the thickness of the fourth lens 4, and L8 is the distance between the image side surface of the fourth lens 4 and the optical axis of the stop 03; l9 is the distance between the stop 03 and the object-side surface 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 surface of the fifth lens element 5 and the object-side surface 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 surface of the sixth lens element 6 and the object-side surface of the seventh lens element 7, L14 is the thickness of the seventh lens element 7, and L15 is the distance between the image-side surface of the seventh lens element 7 and the object-side surface of the eighth lens element 8; l16 is the thickness of the eighth lens element 8, and L17 is the distance from the image-side surface of the eighth lens element 8 to 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, and 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 designed to be infinity as an example in the table.
In the actual scanning projection process, when the optical imaging module is applied to the optical fiber scanning projection system, referring to fig. 2, the imaging process of the light beam scanned and emitted by the optical fiber light-emitting end in the fast axis direction through the projection lens is shown in fig. 3, and the imaging process of the light beam scanned and emitted by the optical fiber light-emitting end in the slow axis direction through the projection lens on the object space 01 is shown in fig. 3, where the scanning track in the slow axis direction is a straight line (i.e., the curvature radius corresponding to the scanning track of the optical fiber light-emitting end is "+ ∞") in fig. 3.
Through tests, when the optical imaging module is adopted to project image light corresponding to a scanning surface, the optical transfer function curve graph is shown in fig. 4, and the distortion curve graphs in the fast axis direction and the slow axis direction are respectively shown in fig. 5A-5B; wherein, the Modulation Transfer Function (MTF) represents the comprehensive resolution level of an optical system, and the distortion curve represents the F-tan (theta) distortion value (percentage) under different angles of view.
As can be seen from the MTF curve of the optical imaging module shown in fig. 4: the MTF at the center at 0.4lp/mm is larger than 0.6, the MTFs at the edges at 0.4lp/mm are both larger than 0.3, and the imaging resolution in the full-field range is good. As can be seen from the distortion curves shown in fig. 5A-5B: the optical system distortion value of the optical imaging module is less than 2%, and the distortion is good in the full-view field range, so that the optical imaging module can clearly image the arc-shaped scanning image of the optical fiber scanner, and has a good imaging effect.
Certainly, in practical applications, the optical imaging module may further include a photosensitive element, a housing, and the like, the photosensitive element may be disposed at an image side of the optical imaging system, and the optical imaging module may be mounted in the housing to form a projection objective, that is, an arc-shaped image scanned and emitted by an image source (such as an optical fiber scanner) may be magnified and imaged on a plane, so as to realize clear imaging.
The above embodiments are only preferred embodiments of the present invention, and the embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the present invention, and all technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or effective experiments according to the concept of the present invention should be within the scope of the present invention.
In the embodiment of the invention, through the arrangement of the focal length and the surface type of each lens in ten lenses with the same optical axis of the two lens groups of the optical imaging module, the focal power of the system can be reasonably dispersed, the aberration generated by the lenses is reduced, and the clear imaging of an arc-shaped image space is realized. Meanwhile, the whole length of the optical imaging module is only 28.5mm, the focal length of the optical imaging module can reach 4mm, the imaging requirement of high resolution can be met while the miniaturization of the system is realized, and the lens can be suitable for an optical fiber scanner with a small fast axis scanning radius.
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (10)
1. An optical imaging module is characterized by comprising a first lens group and a second lens group which are coaxially arranged from an object side to an image side in sequence;
the first lens group comprises four lenses, namely a first lens, a second lens, a third lens and a fourth lens, wherein the four lenses are sequentially arranged from the object side to the image side, and the focal lengths of the first lens, the second lens and the fourth lens are positive, positive and negative 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 including a fifth lens, a sixth lens, a sixth lens, a sixth; 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 of 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 a convex surface, the object side surface of the sixth lens element is a convex surface, the seventh lens element is a biconcave lens element, and the object side surface of the eighth lens element is a concave surface.
3. The optical imaging module of claim 2 wherein the first lens group has an equivalent focal length of F1 and the second lens group has an equivalent focal length of F2, which satisfy 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 element, f2 is a focal length of the second lens element, f3 is a focal length of the third lens element, f4 is a focal length of the fourth lens element, f5 is a focal length of the fifth lens element, f6 is a focal length of the sixth lens element, f7 is a focal length of the seventh lens element, f8 is a focal length of the eighth lens element, f9 is a focal length of the ninth lens element, and f10 is a focal length of the tenth lens element.
5. The optical imaging module of claim 4 further satisfying 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 a refractive index of the first lens, n2 is a refractive index of the second lens, n3 is a refractive index of the third lens, n4 is a refractive index of the fourth lens, n5 is a refractive index of the fifth lens, n6 is a refractive index of the sixth lens, n7 is a refractive index of the seventh lens, n8 is a refractive index of the eighth lens, n9 is a refractive index of the ninth lens, and n10 is a refractive index of the tenth lens.
6. The optical imaging module of any of claims 1-5 further comprising:
and a diaphragm disposed coaxially 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 the distance between the image side surface of the fourth lens and the stop center, and D2 represents the distance between the stop center and the object side surface of the fifth lens.
8. The optical imaging module of claim 7 having an equivalent focal length of 4 mm.
9. The optical imaging module of claim 8 wherein the distance between the object side of the lens barrel and the image side of the tenth lens is less than 3 cm.
10. A scanning display device, comprising an optical fiber scanner and the optical imaging module set according to any one of claims 1-9 corresponding to the optical scanner, wherein the optical fiber scanner is used for scanning and emitting light of an image to be displayed, and the optical imaging module set is used for magnifying, 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 a part of the optical fiber, which exceeds 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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