CN111538199A - Projection lens group and projection display device - Google Patents
Projection lens group and projection display device Download PDFInfo
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- CN111538199A CN111538199A CN202010347222.6A CN202010347222A CN111538199A CN 111538199 A CN111538199 A CN 111538199A CN 202010347222 A CN202010347222 A CN 202010347222A CN 111538199 A CN111538199 A CN 111538199A
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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
- G03B21/142—Adjusting of projection optics
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical 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
-
- 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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/0065—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having a beam-folding prism or mirror
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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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Abstract
The invention discloses a projection lens group and a projection display device, wherein the projection lens group comprises: the device comprises a light source, a correction component and a light-emitting component, wherein the light source emits an imaging light beam; the imaging beam is corrected via the correction component; the light-emitting component comprises a first lens, a second lens and a third lens, wherein the first lens, the second lens and the third lens are sequentially arranged in the emergent direction of the imaging light beam, the first lens is a negative lens, the second lens is a positive lens, the third lens is a negative lens, the first lens receives the light corrected by the correcting component and then the light is ejected by the second lens and the third lens, and the correcting component is formed by injection molding of plastic cement through the first lens, the second lens and the third lens. The technical scheme of the invention can effectively reduce the generation of chromatic aberration and ensure the imaging quality.
Description
Technical Field
The invention relates to the technical field of projection display, in particular to a projection lens group and projection display equipment.
Background
With the development of image technology, the demand of projection display devices is increasing. Meanwhile, projection display devices are also being developed toward miniaturization and portability. The light source of the projection display device, which is miniaturized and portable, usually has a small light emitting area, and projects light emitted from the light source onto a light curtain, which requires a combination of various lenses. When light passes through the lens combination, the deflection directions of the light at the center and the edge of the lens are different, so that aberration is generated. Therefore, the aberration generation is reduced by the lens assembly for correcting the aberration, however, the currently adopted lens assembly for correcting the aberration has poor effect, and the aberration still generates, so that the final imaging is not clear enough.
The above is only for the purpose of assisting understanding of the technical solutions of the present application, and does not represent an admission that the above is prior art.
Disclosure of Invention
Therefore, it is necessary to provide a projection lens assembly and a projection display device, aiming at the problem that the current projection display device adopts a lens assembly for correcting aberration to reduce aberration, which has poor effect and causes final image not clear enough, and the purpose of effectively reducing aberration and improving imaging definition is achieved.
In order to achieve the above object, the present invention provides a projection lens assembly, comprising:
a light source that emits an imaging light beam;
a correction component via which the imaging beam is corrected; and
the light-emitting component, the light-emitting component includes the edge first lens, second lens and the third lens that imaging beam outgoing direction set gradually, first lens is negative lens, the second lens is positive lens, the third lens is negative lens, first lens accepts behind the light that the correction subassembly was rectified via second lens and third lens jet out, the correction subassembly with the light-emitting component is plastic injection moulding.
Optionally, the correction assembly includes a fourth lens, a fifth lens and a sixth lens, the fourth lens is a positive lens, the fifth lens is a positive lens, the sixth lens is a negative lens, and the fourth lens, the fifth lens and the sixth lens are sequentially disposed along the propagation direction of the imaging light beam.
Optionally, a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, a focal length of the sixth lens element is f6, and a focal length of the projection lens group is f, then
-2.5＜f/f1＜-2；1＜f/f2＜2；-2＜f/f3＜-1；
1.5＜f/f4＜2.5；1.5＜f/f5＜2；-2＜f/f6＜-1.5。
Optionally, the correction assembly includes a seventh lens, an eighth lens and a ninth lens, the seventh lens is a positive lens, the eighth lens is a negative lens, the ninth lens is a positive lens, and the seventh lens, the eighth lens and the ninth lens are sequentially disposed along the propagation direction of the imaging light beam.
Optionally, a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the third lens element is f3, a focal length of the seventh lens element is f7, a focal length of the eighth lens element is f8, a focal length of the ninth lens element is f9, and an effective focal length of the projection lens group is f, then
-2.5＜f/f1＜-2；1.5＜f/f2＜2；-1.5＜f/f3＜-1；
1.5＜f/f7＜2；-2.5＜f/f8＜-2；1.5＜f/f9＜2。
Optionally, the third lens has a first surface facing the second lens and a second surface facing away from the second lens, the first surface and the second surface are both aspheric, and the second surface has at least one point of inflection.
Optionally, a first transparent protection plate is arranged in the light outgoing direction of the light source, and a second transparent protection plate is arranged in the light incoming direction of the correction assembly.
Optionally, the projection lens group further includes a cemented prism, a semi-reflective and semi-transparent film is disposed on a cemented surface of the cemented prism, the cemented prism is disposed in a light path between the light source and the correction assembly, and the cemented surface of the cemented prism and the imaging light beam are disposed at an included angle.
Optionally, the diameter of the set of projection mirrors is DIA, the maximum value of the diameter DIA being smaller than 15 mm.
Further, in order to achieve the above object, the present invention also provides a projection display apparatus comprising: the projection lens group is arranged on the shell.
In the technical scheme provided by the invention, the light source emits imaging light beams, and the correcting component and the light emitting component are sequentially arranged in the propagation direction of the imaging light beams, wherein the correcting component is used for correcting aberration generated in the projection lens group. The light-emitting component comprises a first lens, a second lens and a third lens which are sequentially arranged along the emergent direction of the imaging light beam. The first lens is a negative lens, the second lens is a positive lens, the third lens is a negative lens, the first lens diffuses the imaging light beam, the second lens converges the imaging light beam, and positive and negative deviations are mutually offset by the combination mode of the positive and negative lenses, so that the imaging light beam is ensured to be imaged on the same plane after being diffused and converged, and the generation of aberration is further avoided. In addition, the third lens diffuses the imaging light beam, and ensures that the imaging light beam obtains a larger-area image on the projection light curtain. Meanwhile, the third lens is a negative lens and also has the function of balancing the imaging position deviation of the imaging light beam.
Furthermore, the optical devices in the existing projection lens group are made of glass, and the density of the glass is high. The correcting component and the light-emitting component are made of plastic materials, the density of the plastic materials is low, the correcting component and the light-emitting component are processed in an injection molding mode, and therefore the weight of the projection lens group is reduced, and the projection lens group is convenient to carry.
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 structures shown in the drawings without creative efforts.
FIG. 1 is a schematic view of a projection lens assembly according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a projection lens assembly according to another embodiment of the present invention;
FIG. 3 is a schematic view of the structure of FIG. 2 with an additional light source;
FIG. 4 is a diagram of modulation transfer functions of the projection lens assembly of FIG. 1;
FIG. 5 is a schematic view of a row of dots of the projection lens assembly of FIG. 1;
FIG. 6 is a graph of field curvature and distortion of the projection lens assembly of FIG. 1;
FIG. 7 is a graph of relative illumination of the projection lens assembly of FIG. 1;
FIG. 8 is a diagram of modulation transfer functions of the projection lens assembly of FIG. 2;
FIG. 9 is a schematic diagram of a row of dots of the projection lens assembly of FIG. 2;
FIG. 10 is a graph of field curvature and distortion for the projection lens assembly of FIG. 2;
FIG. 11 is a graph of relative illumination of the projection lens assembly of FIG. 2.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
330 | |
| 110 | |
331 | |
| 20 | |
332 | |
| 210 | Fourth lens | 40 | A first transparent |
| 220 | |
50 | Second transparent |
| 230 | |
60 | |
| 240 | |
610 | Glued |
| 250 | |
620 | |
| 260 | |
70 | |
| 30 | |
710 | |
| 310 | |
80 | |
| 320 | Second lens |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
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.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1, a projection lens assembly according to the present embodiment includes: the light source 10 emits an imaging light beam 110, and the correction component 20 and the light emitting component 30 are sequentially arranged in the emitting direction of the imaging light beam 110.
The display principle of the light source 10 includes a self-luminous display device and a device which requires the external light source 10 to emit light for display, and the self-luminous display device includes an OLED (organic light emitting display) display. Devices that require an external Light source 10 to be able to emit Light include LED (Light Emitting Diode) displays. Of course, the self-luminous display device and the display device requiring the external light source 10 in the present application are not limited to the above examples. For example, the Light source 10 may be an LCOS (Liquid Crystal on Silicon) display, a DLP (Digital Light Processing) display, or the like.
The light-emitting element 30 includes a first lens 310, a second lens 320, and a third lens 330 sequentially disposed along the emitting direction of the imaging light beam 110, the first lens 310 is a negative lens, the second lens 320 is a positive lens, the third lens 330 is a negative lens, the first lens 310 receives the light corrected by the correcting element 20 and then emits the light through the second lens 320 and the third lens 330, and the correcting element 20 and the light-emitting element 30 are formed by plastic injection molding. Generally, the optical elements in the projection lens group are made of glass, and the glass has a high density and a large volume. The material density of plastic is less than glass, through setting up correction subassembly 20 and optical component to the plastic weight that can effectively reduce the projection mirror group. In addition, the plastic material is easy to form, and the lens can be processed and manufactured in an injection molding mode. The plastic materials include K26R, EP8000, E48R and EP 7000.
In the technical solution proposed in this embodiment, the light source 10 emits an imaging light beam 110, and in the propagation direction of the imaging light beam 110, a correction component 20 and a light exit component 30 are sequentially disposed, wherein the correction component 20 is used for correcting aberration generated in the projection lens group. The light-exiting assembly 30 includes a first lens 310, a second lens 320 and a third lens 330 sequentially arranged along the exit direction of the imaging light beam 110. The first lens 310 is a negative lens, the second lens 320 is a positive lens, the third lens 330 is a negative lens, the first lens 310 diffuses the imaging light beam 110, the second lens 320 converges the imaging light beam 110, and the positive and negative deviations are mutually offset by the combination of the positive and negative lenses, i.e. the imaging light beam 110 is diverged and converged to ensure that the imaging light beam 110 images on the same plane, thereby further avoiding the generation of aberration. In addition, the third lens 330 diffuses the imaging light beam 110, ensuring that the imaging light beam 110 obtains a larger area image on the projection light curtain. Meanwhile, the third lens 330 is a negative lens, and also has the function of balancing the deviation of the imaging position of the imaging light beam 110. Moreover, the optical devices in the conventional projection lens group are made of glass, and the density of the glass is high. The correcting component 20 and the light-emitting component 30 are made of plastic materials, the density of the plastic materials is low, the correcting component 20 and the light-emitting component 30 are processed in an injection molding mode, and therefore the weight of the projection lens group is reduced, and the projection lens group is convenient to carry.
In the above embodiment, the correcting unit 20 includes the fourth lens 210, the fifth lens 220, and the sixth lens 230, the fourth lens 210 is a positive lens, the fifth lens 220 is a positive lens, and the sixth lens is a negative lens, and the fourth lens 210, the fifth lens 220, and the sixth lens 230 are sequentially disposed along the traveling direction of the imaging light beam 110. Therefore, the arrangement of the lenses in the correction assembly 20 also adopts a combination of a positive lens and a negative lens, and the two positive and negative lenses are arranged to diffuse the imaging light beam 110 twice and converge once again, so as to effectively eliminate the aberration in the imaging light beam 110.
In the above embodiment, the focal length of the first lens element 310 is f1, the focal length of the second lens element 320 is f2, the focal length of the third lens element 330 is f3, the focal length of the fourth lens element 210 is f4, the focal length of the fifth lens element 220 is f5, the focal length of the sixth lens element 230 is f6, and the focal length of the projection lens group is f, the relationship between the focal lengths of the lens elements and the effective focal length of the projection lens group is f:
-2.5＜f1/f＜-2；1＜f2/f＜2；-2＜f3/f＜-1；
1.5＜f4/f＜2.5；1.5＜f5/f＜2；-2＜f6/f＜-1.5。
for example, the focal length f1 of the first lens element 310 is-14.231 mm, the focal length f2 of the second lens element 320 is 11.02mm, the focal length f3 of the third lens element 330 is-10.591 mm, the focal length f4 of the fourth lens element 210 is 11.761mm, the focal length f5 of the fifth lens element 220 is 11.455mm, the focal length f6 of the sixth lens element 230 is-11.494 mm, the focal length f of the projection lens group is 6.25mm, the focal lengths of the lens elements are inherent properties of the lens elements, and aberrations in the projection lens group are effectively eliminated by defining the inherent properties of the lens elements. The material of the first lens element 310 is EP8000, the material of the second lens element 320 is K26R, the material of the third lens element 330 is K26R, the material of the fourth lens element 210 is EP7000, the material of the fifth lens element 220 is EP8000, and the material of the sixth lens element 230 is E48R. The thickness of the first lens 310 is 5mm, the thickness of the second lens 320 is 1.2mm, the thickness of the third lens 330 is 1mm, the thickness of the fourth lens 210 is 5.6mm, the thickness of the fifth lens 220 is 2mm, and the thickness of the sixth lens 230 is 3.4 mm.
FIG. 4 is a Modulation Transfer Function (MTF) diagram of the projection lens assembly of the present embodiment, wherein the MTF diagram is a relationship between modulation degree and the number of line pairs per millimeter in an image for evaluating detail reduction capability of a scene; wherein the uppermost black dotted line is a curve theoretically having no aberration, the closer to the black solid line, the better the imaging quality. In the embodiment adopting the projection lens group, under the condition of incident light with different wavelengths, the distances from the black solid line are all close, and the imaging quality is good.
FIG. 5 is a schematic diagram of a projection lens array of the present embodiment; the point diagram refers to that after a plurality of light rays emitted by one point pass through the optical assembly, intersection points of the light rays and the image surface are not concentrated on the same point any more due to aberration, so that a dispersion pattern scattered in a certain range is formed, and the dispersion pattern is used for evaluating the imaging quality of the projection optical system. The smaller the root mean square radius value and the geometric radius value, the better the imaging quality. The arrangement sequence of the regions 1-11 is from left to right and from top to bottom. In fig. 4, the half-image height of the image plane can also be seen, and under the light with the wavelength of 460nm, the wavelength of 515nm and the wavelength of 617nm, as the half-image height becomes higher, both the root-mean-square radius value and the geometric radius value increase, for example, when the half-image height is 4.1mm, the root-mean-square radius value is 14.26mm, and the geometric radius value is 36.107mm, which meets the imaging requirement.
Fig. 6 is a field curvature and distortion diagram of the projection lens assembly of the present embodiment, wherein the field curvature is an image field curvature, and is mainly used to indicate the misalignment between the intersection point of the whole light beams and the ideal image point in the optical assembly. The distortion refers to the aberration of different magnifications of different parts of an object when the object is imaged through an optical component, and the distortion can cause the similarity of the object image to be deteriorated without influencing the definition of the image. The field curvature and distortion in the embodiment both meet the design requirements, and better imaging quality can be obtained.
Fig. 7 is a relative illuminance diagram of the projection lens set in the present embodiment, where the higher the real main line image height is, the lower the illuminance is, and it can also be understood that the larger the view field angle is, the lower the illuminance is. In this embodiment, when the real main line image height is at the maximum value, the relative contrast value is above 75, and the projection lens group in this embodiment can obtain an image with better brightness.
Referring to fig. 2 and 3, in another embodiment of the present application, the correcting element 20 includes a seventh lens 240, an eighth lens 250, and a ninth lens 260, the seventh lens 240 is a positive lens, the eighth lens 250 is a negative lens, the ninth lens 260 is a positive lens, and the seventh lens 240, the eighth lens 250, and the ninth lens 260 are sequentially disposed along the traveling direction of the imaging light beam 110. Therefore, another mode of combining the positive lens and the negative lens is provided in the present application, and the two positive and negative modes are provided to make the imaging beam 110 converge once, diffuse once again, and converge once again, so as to effectively eliminate the aberration in the imaging beam 110.
In the above embodiment, the focal length of the first lens element 310 is f1, the focal length of the second lens element 320 is f2, the focal length of the third lens element 330 is f3, the focal length of the seventh lens element 240 is f7, the focal length of the seventh lens element 240 is f8, the focal length of the ninth lens element 260 is f9, and the focal length of the projection lens group is f, the relationship between the focal lengths of the lens elements and the effective focal length of the projection lens group is f:
-2.5＜f1/f＜-2；1.5＜f2/f＜2；-1.5＜f3/f＜-1；
1.5＜f7/f＜2；-2.5＜f8/f＜-2；1.5＜f9/f＜2。
for example, the focal length f1 of the first lens element 310 is-14.99 mm, the focal length f2 of the second lens element 320 is 10.736mm, the focal length f3 of the third lens element 330 is-7.71 mm, the focal length f7 of the seventh lens element 240 is 10.627mm, the focal length f8 of the eighth lens element 250 is-14.362 mm, the focal length f9 of the ninth lens element 260 is 9.8254mm, the focal length f of the projection lens group is 6.25mm, the focal lengths of the lens elements are inherent properties of the lens elements, and aberrations in the projection lens group are effectively eliminated by defining the inherent properties of the lens elements. The material of the first lens element 310 is EP8000, the material of the second lens element 320 is K26R, the material of the third lens element 330 is K26R, the material of the seventh lens element 240 is EP7000, the material of the eighth lens element 250 is EP8000, and the material of the ninth lens element 260 is E48R. The thickness of the first lens 310 is 2.27mm, the thickness of the second lens 320 is 5.29mm, the thickness of the third lens 330 is 1.6mm, the thickness of the fourth lens 210 is 4.96mm, the thickness of the fifth lens 220 is 2mm, and the thickness of the sixth lens 230 is 2.91 mm.
Fig. 8 is a modulation transfer function graph, i.e. MTF graph, of the projection lens set in this embodiment, where the MTF graph is used to refer to a relationship between modulation degree and logarithm of lines per millimeter in an image, and is used to evaluate detail reduction capability of a scene; wherein the uppermost black dotted line is a curve theoretically having no aberration, the closer to the black solid line, the better the imaging quality. In the embodiment adopting the projection lens group, under the condition of incident light with different wavelengths, the distances from the black solid line are all close, and the imaging quality is good.
FIG. 9 is a schematic diagram of a projection lens array of the present embodiment; the point diagram refers to that after a plurality of light rays emitted by one point pass through the optical assembly, intersection points of the light rays and the image surface are not concentrated on the same point any more due to aberration, so that a dispersion pattern scattered in a certain range is formed, and the dispersion pattern is used for evaluating the imaging quality of the projection optical system. The smaller the root mean square radius value and the geometric radius value, the better the imaging quality. The arrangement sequence of the regions 1-11 is from left to right and from top to bottom. The half image height of the image plane is also visible in fig. 4. Under light with the wavelength of 460nm, the wavelength of 515nm and the wavelength of 617nm, the root mean square radius value and the geometric radius value increase as the height of the semi-image becomes higher, for example, when the height of the semi-image is 4.1mm, the root mean square radius value is 6.697mm, and the geometric radius value is 14.738mm, so that the imaging requirement is met.
Fig. 10 is a field curvature and distortion diagram of the projection lens assembly of the present embodiment, wherein the field curvature is an image field curvature, and is mainly used to indicate the misalignment between the intersection point of the whole light beams and the ideal image point in the optical assembly. The distortion refers to the aberration of different magnifications of different parts of an object when the object is imaged through an optical component, and the distortion can cause the similarity of the object image to be deteriorated without influencing the definition of the image. The field curvature and distortion in the embodiment both meet the design requirements, and better imaging quality can be obtained.
Fig. 11 is a relative illuminance diagram of the projection lens set in the present embodiment, and it can be understood that the higher the real main line image is, the lower the illuminance is, the larger the view field angle is, the lower the illuminance is. In this embodiment, when the real main line image height is at the maximum value, the relative contrast value is above 75, and the projection lens group in this embodiment can obtain an image with better brightness.
In the above embodiment, the third lens 330 has a first surface facing the second lens 320 and a second surface facing away from the second lens 320, the first surface and the second surface are both aspheric, and the second surface has at least one inflection point. The aspherical surface means that the radius of curvature of the lens surface gradually changes from the center to the periphery, and thus aberration can be improved, for example, the radius of curvature may gradually increase from the center to the periphery or may gradually decrease. Through the change of the curvature radius, the imaging effect of the non-paraxial rays and the imaging effect of the paraxial rays are further changed, the aberration is improved, and the imaging effects are consistent. The first surface and the second surface can be the same in shape or different in shape, the same shape is easier to process, and the different shapes enable the aberration to be adjusted more flexibly, so that better ideal imaging is obtained. In addition, the power of the region before the third lens 330 is discontinuous or unequal, and in order to ensure that the light rays are imaged on the same plane, the second surface of the third lens 330 has at least one point of inflection. The reverse curve point is a discontinuous concave or discontinuous convex curved surface, and the focal power is adjusted through the second surface with the reverse curve point by setting the reverse curve point, so that the light rays in different areas are focused and imaged on the same plane.
In the above embodiment, the first transparent protection plate 40 is disposed in the light emitting direction of the light source 10, and the second transparent protection plate 50 is disposed in the light incident direction of the calibration assembly 20. Specifically, the first transparent protective plate 40 is packaged at the light emitting surface of the light source 10, and the first transparent protective plate 40 is used for protecting the light source 10. A second transparent protection plate 50 is disposed on the light incident surface of the correction assembly 20, and the second transparent protection plate 50 is used for protecting the optical devices in the correction assembly 20.
In the above embodiment, the projection lens group further includes a cemented prism 60, a semi-reflective and semi-transparent film is disposed on a cemented surface 610 of the cemented prism 60, the cemented prism 60 is disposed in an optical path between the light source 10 and the correction assembly 20, and the cemented surface 610 of the cemented prism 60 and the imaging light beam 110 are disposed at an included angle. The included angle ranges from 0 to 90, for example, the included angle is 45. The light emitting principle of the light source 10 includes the case that an external light source 10 is needed, in this case, an additional light source 7010 needs to be arranged, the additional light source 7010 emits an illumination light beam 710, the illumination light beam 710 is transmitted to the bonding surface 610 of the bonding prism 60, a total reflection surface 620 is arranged on the surface, far away from the additional light source 7010, of the bonding prism 60, the illumination light beam 710 passes through the bonding surface 610 and then is reflected by the total reflection surface 620 to be emitted to the bonding surface 610 again, and under the condition that the bonding surface 610 is provided with a semi-reflective and semi-transparent film, the illumination light beam 710 is reflected to the light source 10 to provide external illumination for the light source 10, so that the light source 10 can smoothly emit.
In the above embodiment, the diameter of the projection lens group is DIA, and the maximum value of the diameter DIA is less than 15 mm. Through the diameter of injecing the projection mirror group, avoid the too big projection mirror group, make projection display device portable.
In addition, the distance between the light emitting surface of the light source 10 and the second surface of the third lens element 330 is total optical length TTL, which is less than 47mm, so as to further reduce the size of the projection lens assembly, and make the projection display device portable. Moreover, the view field angle of the projection lens group is FOV, and half of the view field angle is HFOV, then tan (HFOV)/TTL is greater than 0.018. The telecentricity Tele of the projection lens group is smaller than 1 degree, and the emergent angle of the principal ray of the telecentric Tele light source 10 is smaller than the exit angle of the principal ray of the projection lens group.
In the above embodiment, the projection lens group is further provided with a diaphragm 80, the diaphragm 80 is disposed in the light path between the correction component 20 and the light exit component 30, the diaphragm 80 is used to define an aperture passing through the light path, and a light passing space of the diaphragm 80 may be fixedly disposed or may be adjusted as needed.
The present invention also provides a projection display device comprising: the shell and the projection lens group are arranged on the shell. The shell is used for forming a space for installing the projection lens group and has the function of supporting and protecting the projection lens group.
The specific implementation of the projection lens group in this embodiment refers to the above description, and is not repeated herein.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A projection lens assembly, comprising:
a light source that emits an imaging light beam;
a correction component via which the imaging beam is corrected; and
the light-emitting component, the light-emitting component includes the edge first lens, second lens and the third lens that imaging beam outgoing direction set gradually, first lens is negative lens, the second lens is positive lens, the third lens is negative lens, first lens accepts behind the light that the correction subassembly was rectified via second lens and third lens jet out, the correction subassembly with the light-emitting component is plastic injection moulding.
2. The projection lens group of claim 1, wherein the correction assembly comprises a fourth lens element, a fifth lens element and a sixth lens element, the fourth lens element is a positive lens element, the fifth lens element is a positive lens element, the sixth lens element is a negative lens element, and the fourth lens element, the fifth lens element and the sixth lens element are arranged in sequence along the direction of propagation of the imaging beam.
3. The projection lens group of claim 2, wherein the focal length of the first lens element is f1, the focal length of the second lens element is f2, the focal length of the third lens element is f3, the focal length of the fourth lens element is f4, the focal length of the fifth lens element is f5, the focal length of the sixth lens element is f6, and the focal length of the projection lens group is f, then
-2.5＜f1/f＜-2；1＜f2/f＜2；-2＜f3/f＜-1；
1.5＜f4/f＜2.5；1.5＜f5/f＜2；-2＜f6/f＜-1.5。
4. The projection lens group of claim 1, wherein the correction assembly comprises a seventh lens element, an eighth lens element and a ninth lens element, the seventh lens element is a positive lens element, the eighth lens element is a negative lens element, the ninth lens element is a positive lens element, and the seventh lens element, the eighth lens element and the ninth lens element are arranged in sequence along the direction of propagation of the imaging light beam.
5. The projection lens group of claim 4, wherein the focal length of the first lens element is f1, the focal length of the second lens element is f2, the focal length of the third lens element is f3, the focal length of the seventh lens element is f7, the focal length of the eighth lens element is f8, the focal length of the ninth lens element is f9, and the effective focal length of the projection lens group is f, then
-2.5＜f1/f＜-2；1.5＜f2/f＜2；-1.5＜f3/f＜-1；
1.5＜f7/f＜2；-2.5＜f8/f＜-2；1.5＜f9/f＜2。
6. The projection lens group of any of claims 1 to 5, wherein the third lens has a first surface facing the second lens and a second surface facing away from the second lens, both the first surface and the second surface being aspheric, the second surface having at least one point of inflection.
7. The mirror group as claimed in any of claims 1 to 5, wherein a first transparent protection plate is disposed in the light exit direction of the light source, and a second transparent protection plate is disposed in the light entrance direction of the calibration module.
8. The mirror set according to any of claims 1-5, further comprising a cemented prism, wherein a semi-reflective and semi-transparent film is disposed on a cemented surface of the cemented prism, the cemented prism is disposed in an optical path between the light source and the correction assembly, and the cemented surface of the cemented prism and the imaging light beam are disposed at an included angle.
9. The set of projection mirrors according to one of claims 1 to 5, characterized in that the diameter of the set of projection mirrors is DIA, the maximum value of the diameter DIA being less than 15 mm.
10. A projection display device, comprising: a housing and a set of projection mirrors according to any one of claims 1 to 9, said set of projection mirrors being arranged on said housing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010347222.6A CN111538199A (en) | 2020-04-27 | 2020-04-27 | Projection lens group and projection display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010347222.6A CN111538199A (en) | 2020-04-27 | 2020-04-27 | Projection lens group and projection display device |
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| CN202010347222.6A Pending CN111538199A (en) | 2020-04-27 | 2020-04-27 | Projection lens group and projection display device |
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| CN103091937A (en) * | 2012-10-11 | 2013-05-08 | 中山市众盈光学有限公司 | Projection lens |
| US20170038564A1 (en) * | 2015-08-04 | 2017-02-09 | Coretronic Corporation | Projection display apparatus and projection lens module thereof |
| CN109001887A (en) * | 2017-06-07 | 2018-12-14 | 宁波舜宇车载光学技术有限公司 | Optical lens |
| CN109557637A (en) * | 2017-09-27 | 2019-04-02 | 大立光电股份有限公司 | Optical imaging lens assembly, image capturing device and electronic device |
| CN110568586A (en) * | 2019-08-30 | 2019-12-13 | 歌尔股份有限公司 | Projection lens and projection equipment |
| CN112684597A (en) * | 2020-12-28 | 2021-04-20 | 中国科学院福建物质结构研究所 | Laser lens camera lens and laser projector |
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| CN103091937A (en) * | 2012-10-11 | 2013-05-08 | 中山市众盈光学有限公司 | Projection lens |
| US20170038564A1 (en) * | 2015-08-04 | 2017-02-09 | Coretronic Corporation | Projection display apparatus and projection lens module thereof |
| CN109001887A (en) * | 2017-06-07 | 2018-12-14 | 宁波舜宇车载光学技术有限公司 | Optical lens |
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