CN114594574B - Optical projection system and electronic equipment - Google Patents
Optical projection system and electronic equipment Download PDFInfo
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- CN114594574B CN114594574B CN202210344571.1A CN202210344571A CN114594574B CN 114594574 B CN114594574 B CN 114594574B CN 202210344571 A CN202210344571 A CN 202210344571A CN 114594574 B CN114594574 B CN 114594574B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 154
- 230000009467 reduction Effects 0.000 claims abstract description 19
- 230000004075 alteration Effects 0.000 description 26
- 238000012546 transfer Methods 0.000 description 20
- 238000003384 imaging method Methods 0.000 description 19
- 230000000694 effects Effects 0.000 description 16
- 238000010586 diagram Methods 0.000 description 15
- 238000013461 design Methods 0.000 description 10
- 238000012634 optical imaging Methods 0.000 description 6
- 239000005357 flat glass Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000001429 visible spectrum Methods 0.000 description 2
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Classifications
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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
- G02B13/0055—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
- G02B13/16—Optical objectives specially designed for the purposes specified below for use in conjunction with image converters or intensifiers, or for use with projectors, e.g. objectives for projection TV
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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
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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
Abstract
The application discloses an optical projection system and electronic equipment. From the magnification side to the reduction side, the optical projection system includes: the optical projection system comprises a first lens group and a second lens group, wherein a diaphragm is arranged between the first lens group and the second lens group, the second lens group comprises a first sub-lens group close to the diaphragm and a second sub-lens group far away from the diaphragm, a first air interval is arranged between the first sub-lens group and the diaphragm, a second air interval is arranged between the first sub-lens group and the second sub-lens group, the first air interval is 2% -6% of the total optical length of the optical projection system, and the second air interval is smaller than 1mm.
Description
Technical Field
The present application relates to the technical field of optical devices, and more particularly, to an optical projection system and an electronic device.
Background
In recent years, optical imaging lenses have been continuously developed, and in addition to improving imaging quality such as aberration and chromatic aberration of the lenses, it is increasingly important to achieve light miniaturization of the optical imaging lenses. Therefore, how to provide an optical imaging lens that is light, thin, short, and small and has good imaging quality has been a development goal of design.
Disclosure of Invention
An object of the present application is to provide a new technical solution for an optical projection system and an electronic device.
According to a first aspect of an embodiment of the present application, an optical projection system is provided. From a magnification side to a reduction side, the optical projection system includes: a diaphragm is arranged between the first lens group and the second lens group; the focal power of the first lens group is negative, and the focal power of the second lens group is positive; the second lens group comprises a first sub-lens group close to the diaphragm and a second sub-lens group far away from the diaphragm, a first air interval is arranged between the first sub-lens group and the diaphragm, a second air interval is arranged between the first sub-lens group and the second sub-lens group, the first air interval is 2% -6% of the total optical length of the optical projection system, and the second air interval is smaller than 1mm.
Optionally, the first sub-lens group is a cemented lens group, and the second sub-lens group is an aspherical lens.
Optionally, from the magnification side to the reduction side, the first lens group includes a first lens, a second lens, a third lens, and a third sub-lens group, optical powers of the first lens, the second lens, and the third lens are all negative, and optical power of the third sub-lens group is positive.
Optionally, the third sub-lens group includes a fourth lens, and the optical power of the fourth lens is positive.
Optionally, the third sub-lens group includes a fourth lens, a fifth lens, a sixth lens, and a seventh lens, wherein in the fourth lens, the fifth lens, the sixth lens, and the seventh lens, optical powers of adjacent lenses are opposite.
Optionally, the fourth lens and the fifth lens are connected in a glued manner, and the sixth lens and the seventh lens are connected in a glued manner.
Optionally, the sum of the optical powers of the first lens, the second lens and the third lens is-0.18 to 0.14.
Optionally, the first lens is an aspheric lens, and an air space between the first lens and the second lens is greater than 10mm.
Optionally, the second lens group includes an eighth lens, a ninth lens, a tenth lens and an eleventh lens along the enlargement side to the reduction side, the eighth lens, the ninth lens and the tenth lens are connected by gluing to form the cemented lens, and the eleventh lens is an aspherical lens.
Optionally, the optical power of the eighth lens and the tenth lens is positive, the optical power of the ninth lens is negative, and the refractive index of the lens with positive optical power is smaller than the refractive index of the lens with negative optical power.
According to a second aspect of an embodiment of the present application, there is provided an electronic device. The electronic device comprises the optical projection system of the first aspect.
In an embodiment of the present application, an optical projection system is provided. The optical projection system includes a first lens group and a second lens group, the second lens group including a first sub-lens group and a second sub-lens group. The application ensures that the total optical length of the optical projection system is not overlong and reduces the volume of the optical projection system by limiting the first air interval between the first sub-lens group and the diaphragm and the second air interval between the first sub-lens group and the second sub-lens group.
Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the application, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.
FIG. 1 is a block diagram of an optical projection system according to the present application.
FIG. 2 is a color difference diagram of the optical projection system of FIG. 1.
Fig. 3 is a distortion diagram of the optical projection system of fig. 1.
Fig. 4 is a graph of the modulation transfer function of the optical projection system of fig. 1.
Fig. 5 is a graph showing defocus curves of the optical projection system of fig. 1.
FIG. 6 is a diagram illustrating a second embodiment of an optical projection system according to the present application.
FIG. 7 is a color difference diagram of the optical projection system of FIG. 2.
Fig. 8 is a distortion diagram of the optical projection system of fig. 2.
Fig. 9 is a graph of the modulation transfer function of the optical projection system of fig. 2.
Fig. 10 is a graph showing defocus curves of the optical projection system of fig. 2.
Fig. 11 is a graph showing the modulation transfer function according to one embodiment of the present application.
Fig. 12 is a graph of the modulation transfer function according to one embodiment of the present application.
Fig. 13 is a graph showing the modulation transfer function according to one embodiment of the present application.
Fig. 14 is a light path diagram of the optical projection system of fig. 1.
Fig. 15 is a light path diagram of the optical projection system of fig. 6.
Reference numerals illustrate:
30. a first lens group; 40. a second lens group; 20. a first sub-lens group;
1. a first lens; 2. a second lens; 3. a third lens; 4. a fourth lens; 5. a fifth lens; 6. a sixth lens; 7. a seventh lens; 8. an eighth lens; 9. a ninth lens; 10. a tenth lens; 11. an eleventh lens; 12. a diaphragm; 13. an image source; 14. a sheet glass; 15. and a prism.
Detailed Description
Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses.
Techniques and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
The present application provides an optical projection system, as shown with reference to fig. 1, 14 and 6 and 15, from an enlargement side to a reduction side, comprising: a first lens group 30 and a second lens group 40, a diaphragm 12 being provided between the first lens group 30 and the second lens group 40; the focal power of the first lens group 30 is negative, and the focal power of the second lens group 40 is positive; the second lens group 40 includes a first sub-lens group 20 near the aperture 12 and a second sub-lens group far from the aperture 12, a first air space is provided between the first sub-lens group 20 and the aperture 12, a second air space is provided between the first sub-lens group 20 and the second sub-lens group, the first air space is 2% -6% of the total optical length of the optical projection system, and the second air space is less than 1mm. In an alternative embodiment, the first air gap is 4% -6% of the total optical length of the optical projection system. In another alternative embodiment, the first air gap is 2% -5% of the total optical length of the optical projection system.
In other words, the optical projection system of the present application is applied to a projection apparatus, and further includes an image source 13, a sheet glass 14, and a prism 15. The image source 13, the flat glass 14, the prism 15, the second lens group 40, and the first lens group 30 are disposed between the reduction side and the enlargement side in this order along the same optical axis, including the reduction side and the enlargement side in the light transmission direction. The reduction side is the side where the image source 13 (such as DMD chip) generating projection light is located in the projection process, i.e. the image side; the magnified side is the side on which the projection surface (e.g., projection screen) for displaying the projected image is located during projection, i.e., the object side. The transmission direction of the projection light is from the shrinking side to the enlarging side. However, when an optical projection system is actually designed, light is simulated from the actual enlargement side to the reduction side according to the principle of reversibility of the optical path.
In the embodiment of the application, the image source 13 may be a digital micromirror element (Digital Micromirror Device, DMD) chip. The DMD consists of a plurality of digital micro-reflectors arranged in a matrix, and each micro-reflector can deflect and lock in the forward and reverse directions when in operation, so that light rays are projected in a given direction and swing at a frequency of tens of thousands of hertz, and the light rays from the illumination light source enter an optical system to be imaged on a screen through the turning reflection of the micro-reflectors. The DMD has the advantages of high resolution, no need of digital-to-analog conversion of signals and the like. This example uses a 0.2"DMD with a throw ratio of 0.7, 140% offset or a 0.23" DMD with a throw ratio of 0.5, 140% offset. Of course, the image source 13 may also be a liquid crystal on silicon (LiquidCrystal On Silicon, LCOS) chip or other display device for emitting light, which is not limited by the present application.
In this embodiment, the focal power of the first lens group 30 is negative, the focal power of the second lens group 40 is positive, and the focal powers of the lens groups are reasonably matched, so that the whole optical projection system has better light converging capability. In addition, the second lens group 40 includes a first sub-lens group 20 close to the aperture 12 and a second sub-lens group far from the aperture 12, and by optimally configuring the air space between the first sub-lens group 20 and the second sub-lens group and the air space between the first sub-lens group 20 and the aperture 12, the optical total length of the optical projection system can be effectively reduced, thereby achieving light and thin and miniaturization. Therefore, the optical projection system can effectively reduce the total length of the optical projection system while meeting the imaging quality, and achieve light weight, thinness and miniaturization.
In one embodiment, the first sub-lens group 20 is a cemented lens group and the second sub-lens group is an aspherical lens.
In this embodiment, the first sub-lens group 20 is a cemented lens group disposed near the stop 12. The cemented lens group can reduce chromatic aberration or eliminate chromatic aberration. The achromatic design of the cemented lens assembly also helps to reduce spherical aberration. In particular, the cemented lens group of the present embodiment is disposed near the diaphragm 12, so that the cemented lens group can improve the effect of reducing chromatic aberration or eliminating chromatic aberration.
In this embodiment, the second sub-lens group is an aspherical lens, i.e. in the second lens group 40, the lens closest to the image source 13 is an aspherical lens, i.e. in the second lens group 40, the lens furthest from the magnification side is an aspherical lens. The second sub-lens group is set to be an aspheric lens, so that the edge aberration is reduced, and the imaging effect of the optical projection system is improved. In particular, the present embodiment defines the air space between the cemented lens group and the second sub-lens, so as to further improve the effect of correcting the aberration of the aspherical lens for different fields of view. In particular, because the aspherical lens functions to correct aberrations of different fields of view, there is a need for a sufficient air space between adjacent lenses to produce the effect of correction. In an alternative embodiment, in order to reduce the overall volume of the optical projection system without affecting the correction of aberrations by the aspherical lens, the air gap between the cemented lens assembly and the aspherical lens is less than 1mm and greater than 0.1mm.
In one embodiment, the first lens group 30 includes, from the enlargement side to the reduction side, a first lens 1, a second lens 2, a third lens 3, and a third sub-lens group, the optical powers of the first lens 1, the second lens 2, and the third lens 3 are all negative, and the optical power of the third sub-lens group is positive.
In this embodiment, the first lens group 30 includes the first lens 1, the second lens 2, the third lens 3, and the third sub-lens group, and in order to ensure that the optical power of the first lens group 30 is negative, the number of lenses whose optical power is negative is greater than the number of lenses whose optical power is positive in the first lens group 30.
In this embodiment, in the first lens group 30, the positive power lens functions to neutralize the power of the first lens group 30, ensuring the power balance of the first lens group 30 as much as possible. Specifically, since the first three lenses in the first lens group 30 all provide negative power, the imaging aberrations are all negative. The power of the third sub-lens group is positive, and the positive power lens can cancel a part of the negative power, and attenuate the aberration of the first lens group 30.
In one embodiment, referring to fig. 1, the third sub-lens group includes a fourth lens 4, and the optical power of the fourth lens 4 is positive.
Specifically, the first lens group 30 includes, from the enlargement side to the reduction side, a first lens 1, a second lens 2, a third lens 3, and a fourth lens 4. In the first lens 1, the second lens 2, the third lens 3, and the fourth lens 4, the order of powers is: negative positive.
In this embodiment, in the first lens group 30, the power of the first three lenses near the magnification side is set negative. When the optical projection system is simulated, the first lens group 30 of the optical projection system deflects the incident light, the incident light can enter the optical projection system at a larger negative incident angle, when the light reaches the third lens 3, the incident angle is basically 0 degrees, and finally, the incident light enters the second lens group 40 at a smaller positive incident angle, so that the angle of the light entering the second lens group 40 is not too large, namely, the first lens group 30 has a beam converging effect on the light, and the light beam is converged (the light beam is diverged if the light beam is actually projected). For example, in one specific embodiment, the first three lenses shrink the incident light from around-50 ° to 0 °, and expand to around +5°, ensuring that the angle at which the light enters the second lens group 40 is not too great.
In one embodiment, referring to fig. 6, the third sub-lens group includes a fourth lens 4, a fifth lens 5, a sixth lens 6, and a seventh lens 7, wherein optical powers of adjacent lenses are opposite in the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7.
In this embodiment, in order to ensure that the optical power of the third sub-lens group is positive, the optical powers of the four lenses in the third sub-lens group are reasonably distributed so that the optical power of the third sub-lens group is positive. In this embodiment, the powers of the fourth lens 4, the fifth lens 5, the sixth lens 6 and the seventh lens 7 in the third sub-lens group are positive and negative, or the powers of the fourth lens 4, the fifth lens 5, the sixth lens 6 and the seventh lens 7 are negative and positive, and the powers of the sub-lens group 20 are reasonably distributed by alternately setting positive powers and negative powers.
In one embodiment, the fourth lens 4 and the fifth lens 5 are cemented, and the sixth lens 6 and the seventh lens 7 are cemented.
In this embodiment, the fourth lens 4 and the fifth lens 5 are cemented together to form a cemented lens, while the sixth lens 6 and the seventh lens 7 are cemented together to form a cemented lens. In this embodiment, therefore, two sets of cemented lenses are included in the first lens group 30, by which problems such as chromatic aberration occurring during imaging are corrected.
In one embodiment, the sum of the powers of the first lens 1, the second lens 2 and the third lens 3 is-0.18 to 0.14.
Referring to fig. 1, in the first lens 1, the second lens 2, the third lens 3, and the fourth lens 4, the order of optical power is: negative positive. In this embodiment, in the first lens group 30, the power of the first three lenses near the magnification side is set negative. When the optical projection system is simulated, the first lens group 30 of the optical projection system deflects the incident light, the incident light can enter the optical projection system at a larger negative incident angle, when the light reaches the third lens 3, the incident angle is basically 0 degrees, and finally, the incident light enters the second lens group 40 at a smaller positive incident angle, so that the angle of the light entering the second lens group 40 is not too large, namely, the first lens group 30 has a beam converging effect on the light, and the light beam is converged (the light beam is diverged if the light beam is actually projected). For example, in one specific embodiment, the first three lenses shrink the incident light from around-50 ° to 0 °, and expand to around +5°, ensuring that the angle at which the light enters the second lens group 40 is not too great.
Referring to fig. 6, the sum of the powers of the first lens 1, the second lens 2 and the third lens 3 is-0.14 to-0.11. In the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7, the order of optical power is: negative positive. In this embodiment, in the first lens group 30, the power of the first three lenses near the magnification side is set negative. When the optical projection system is simulated, the first lens group 30 of the optical projection system deflects the incident light, the incident light can enter the optical projection system at a larger negative incident angle, when the light reaches the third lens 3, the incident angle is basically 0 degrees, and finally, the incident light enters the second lens group 40 at a smaller positive incident angle, so that the angle of the light entering the second lens group 40 is not too large, namely, the first lens group 30 has a beam converging effect on the light, and the light beam is converged (the light beam is diverged if the light beam is actually projected). For example, in one specific embodiment, the first three lenses shrink the incident light from about-56 to about 0, and expand to about +5 to ensure that the angle at which the light enters the second lens group 40 is not too great.
In one embodiment, referring to fig. 1 and 6, the first lens 1 is an aspherical lens, and an air space between the first lens 1 and the second lens 2 is greater than 10mm.
In this embodiment, the first lens 1 is an aspherical lens, i.e., in the first lens group 30, the lens farthest from the image source 13 is an aspherical lens, i.e., in the first lens group 30, the lens closest to the magnification side is an aspherical lens. The first lens 1 is arranged as an aspheric lens, so that the edge aberration is reduced, and the imaging effect of the optical projection system is improved.
The present embodiment defines the air space between the first lens group 30 and the second lens 2, and further improves the effect of correcting the aberration of the aspherical lens for different fields of view. In particular, since the aspherical lens functions to correct aberrations of different fields of view, a sufficient air distance from its neighboring lenses is required to produce a corrective effect.
In one embodiment, referring to fig. 1 and 6, the second lens group 40 includes an eighth lens 8, a ninth lens 9, a tenth lens 10, and an eleventh lens 11 along the enlargement side to the reduction side, the eighth lens 8, the ninth lens 9, and the tenth lens 10 are cemented to form a cemented lens, and the eleventh lens 11 is an aspherical lens.
In this embodiment, the eighth lens 8, the ninth lens 9, and the tenth lens 10 in the second lens group 40 are cemented together to form a cemented lens, wherein in the second lens group 40, the cemented lens is disposed closest to the magnification side, and the eleventh lens 11 is disposed closest to the image source 13, that is, in the case where the first lens group 30 and the second lens group 40 are provided with the diaphragm 12, the cemented lens is disposed in the vicinity of the diaphragm 12 to further enhance the effect of eliminating chromatic aberration.
In this embodiment, the eleventh lens 11 is an aspherical lens, that is, in the second lens group 40, the lens closest to the image source 13 is an aspherical lens, that is, in the second lens group 40, the lens farthest from the magnification side is an aspherical lens. The eleventh lens is an aspheric lens, so that the edge aberration is reduced, and the imaging effect of the optical projection system is improved.
In one embodiment, the optical power of the eighth lens 8 and the tenth lens 10 is positive, the optical power of the ninth lens 9 is negative, and the refractive index of the lens with positive optical power is smaller than that of the lens with negative optical power.
In this embodiment, among the eighth lens 8, the ninth lens 9, and the tenth lens 10, the number of lenses whose optical power is positive is larger than that of lenses whose optical power is negative. Specifically, the first lens group 30 has a negative power, and the second lens group 40 has a positive power as a whole in order to balance the aberration of the optical projection system, so that the number of lenses having positive power is larger than that having negative power.
In this embodiment, the reason for using a cemented lens in the second lens group 40 is to eliminate chromatic aberration, in which the refractive index of a lens having positive power is smaller than that of a lens having negative power, that is, a cemented lens having a combination of a high refractive index and a low refractive index is advantageous for eliminating chromatic aberration.
In a specific embodiment, the first lens group 30 includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, and a seventh lens 7, and the fourth lens 4 and the fifth lens 5 are bonded together to form a cemented lens. The eighth lens 8, the ninth lens 9, the tenth lens 10, and the eleventh lens 11 are included in the second lens group 40, and the eighth lens 8, the ninth lens 9, and the tenth lens 10 are cemented together to form a cemented lens. In this embodiment, the optical projection system has a larger angle of view, and the chromatic aberration is linearly related to the angle of view, the larger the chromatic aberration. In this embodiment, in order to reduce the chromatic aberration of the optical projection system, three groups of cemented mirrors are used to eliminate the chromatic aberration. In a specific embodiment, the refractive index of the lens with positive optical power ranges from 1.48 to 1.6, and the refractive index of the lens with negative optical power ranges from 1.8 to 1.85.
According to a second aspect of an embodiment of the present application, there is provided an electronic device. The electronic device comprises an optical projection system as described in the first aspect. In this embodiment, the electronic device is a projection apparatus. For example, the projection device may be a projector, or an illumination light engine, etc.
Example 1
In a specific embodiment, referring to fig. 1, from the enlargement side to the reduction side, the first lens group 30 includes a first lens 1, a second lens 2, a third lens 3, and a fourth lens 4, and the order of optical power of the first lens group 30 is: negative positive. The second lens group 40 includes, from the enlargement side to the reduction side, an eighth lens 8, a ninth lens 9, a tenth lens 10, and an eleventh lens 11, and the order of optical power of the second lens group 40 is: positive and negative. Wherein the eighth lens 8, the ninth lens 9 and the tenth lens 10 are cemented.
In this embodiment, the surface of the first lens 1 near the magnification side is a convex surface, and the surface disposed adjacent to the second lens 2 is a concave surface; the surface of the second lens 2 adjacent to the first lens 1 is a convex surface, and the surface of the second lens 2 adjacent to the third lens 3 is a concave surface; the surface of the third lens 3 adjacent to the second lens 2 is a convex surface, and the surface of the third lens adjacent to the fourth lens 4 is a concave surface; the surface of the fourth lens 4 adjacent to the third lens 3 is a convex surface, and the surface adjacent to the diaphragm 12 is a convex surface; the surface of the eighth lens 8 adjacent to the diaphragm 12 is a convex surface, and the surface of the eighth lens 9 adjacent to the ninth lens is a convex surface; the surface of the ninth lens 9 adjacent to the eighth lens 8 is a concave surface, and the surface adjacent to the tenth lens 10 is a concave surface; the surface of the tenth lens 10 adjacent to the ninth lens 9 is a convex surface, and the surface adjacent to the eleventh lens 11 is a convex surface; the surface of the eleventh lens 11 adjacent to the tenth lens 10 is a convex surface, and the surface adjacent to the prism 15 is a convex surface.
In this embodiment, the focal length range of the first lens 1 is: -22 to-20; the focal length range of the second lens 2 is: -17 to-14; the focal length range of the third lens 3 is: -21 to-17; the focal length range of the fourth lens 4 is: 11-14; the focal length range of the eighth lens 8 is: -98 to-90; the focal length range of the ninth lens 9 is: -23 to-19; the tenth lens 10 has a focal length in the range of: 37-42; the focal length range of the eleventh lens 11 is: 10 to 13.
In the embodiment, each lens adopts a reasonable surface-shaped structure and optical power collocation, so that the whole lens group has better light converging capability; in addition, by optimally configuring the air space between the lenses, the total length of the optical lens group can be effectively reduced, thereby achieving light weight and miniaturization. Therefore, the optical imaging lens group can effectively reduce the total length of the lens group while meeting the imaging of a large field angle, and achieve the light weight, the thinness and the miniaturization.
In this embodiment, the optical projection system includes, from the enlargement side to the reduction side, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a stop 12, an eighth lens 8, a ninth lens 9, a tenth lens 10, and an eleventh lens 11.
The specific parameters of each lens are shown in table 1 below:
in the present embodiment, the first lens 1 is an aspherical lens, and the eleventh lens 11 is an aspherical lens, and the remaining lenses are spherical lenses. Wherein the spherical parameters corresponding to the aspherical lenses are shown in table 2:
in this example, using a 0.2"dmd,140% offset design, the optical projection system can achieve the following effects: projection ratio: 0.7, optical system focal length: 3 mm-3.5 mm; angle of view: 48-54 degrees; like circle diameter: 7.7 mm-8.1 mm; system F number: 1.72 to 1.79.
The field parameters of the optical imaging module obtained through measurement are shown in fig. 2 to 5.
As shown in fig. 2, is a color difference diagram of the optical projection system. As can be seen from the figure, the color difference value is smaller than 4um in the visible spectrum band, and the color reproducibility of the image is higher.
As shown in fig. 3, the Distortion (Distortion) value of the optical projection system is less than 0.6% (usually less than 1%) as shown in the graph, and the Distortion imaged by the system under each view field is smaller, so that the requirement of human eyes on Distortion can be completely met.
The modulation transfer function diagram (modulation transfer function, MTF) of the present embodiment is shown in fig. 4). Fig. 4 is a graph of modulation transfer functions of the projection optical system at different image heights. Wherein the horizontal axis is spatial frequency (Spatial Frequency in cycles per mm) and the vertical axis is OTF modulus (Modulus of the OTF). It is understood from the figure that the OTF mode value of an image can be kept at 0.5 or more throughout the interval of 0mm to 93mm in spatial frequency, and generally the quality of an image is higher as the OTF mode value is closer to 1, but since there is no case where the OTF mode value is 1 due to the influence of various factors, it is generally known that the optical projection system of the present embodiment has higher imaging quality when the OTF mode value can be kept at 0.5 or more, that is, it means that an image has high imaging quality and the definition of a picture is excellent.
As shown in fig. 5, which is a defocus graph of the present embodiment, it can be seen from the graph that the defocus amount of the optical projection system under visible light is small.
Example 2
Example 2 differs from example 1 in that: the radius of curvature, thickness, and parameters of the aspherical lens are different for each lens. In this example, specific parameters of each lens are shown in table 3 below:
in the present embodiment, the first lens 1 is an aspherical lens, and the eleventh lens 11 is an aspherical lens, and the remaining lenses are spherical lenses. Wherein the spherical parameters corresponding to the aspherical lenses are shown in table 4:
in this example, using a 0.2"dmd,140% offset design, the optical projection system can achieve the following effects: projection ratio: 0.7, optical system focal length: 3 mm-3.5 mm; angle of view: 48-54 degrees; like circle diameter: 7.7 mm-8.1 mm; system F number: 1.72 to 1.79.
Example 3
Example 3 differs from example 1 in that: the radius of curvature, thickness, and parameters of the aspherical lens are different for each lens. In this example, specific parameters of each lens are shown in table 5 below:
in the present embodiment, the first lens 1 is an aspherical lens, and the eleventh lens 11 is an aspherical lens, and the remaining lenses are spherical lenses. Wherein the spherical parameters corresponding to the aspherical lenses are shown in table 6:
in this example, using a 0.2"dmd,140% offset design, the optical projection system can achieve the following effects: projection ratio: 0.7, optical system focal length: 3 mm-3.5 mm; angle of view: 48-54 degrees; like circle diameter: 7.7 mm-8.1 mm; system F number: 1.72 to 1.79.
Example 4
Example 4 differs from example 1 in that: the radius of curvature, thickness, and parameters of the aspherical lens are different for each lens. In this example, specific parameters of each lens are shown in table 7 below:
in the present embodiment, the first lens 1 is an aspherical lens, and the eleventh lens 11 is an aspherical lens, and the remaining lenses are spherical lenses. Wherein the spherical parameters corresponding to the aspherical lenses are shown in table 8:
in this example, using a 0.2"dmd,140% offset design, the optical projection system can achieve the following effects: projection ratio: 0.7, optical system focal length: 3 mm-3.5 mm; angle of view: 48-54 degrees; like circle diameter: 7.7 mm-8.1 mm; system F number: 1.72 to 1.79.
Example 5
In a specific embodiment, referring to fig. 6, the optical projection system includes, from the enlargement side to the reduction side, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, and an eleventh lens 11. Wherein a diaphragm 12 is arranged between the seventh lens 7 and the eighth lens 8. The fourth lens 4 and the fifth lens 5 are bonded together. The sixth lens 6 and the seventh lens 7 are bonded together. The eighth lens 8, the ninth lens 9 and the tenth lens 10 are bonded. The optical power arrangement sequence of the optical projection system is as follows: negative positive/positive. In this embodiment, the optical power range of the first lens 1 is: -0.045 to-0.043; the optical power range of the second lens 2 is: -0.062 to-0.06; the third lens 3 has an optical power range of: -0.068 to-0.066; the fourth lens 4 has an optical power range of: 0.052 to 0.054; the fifth lens 5 has an optical power range of: 0.016 to 0.018; the sixth lens 6 has an optical power range of: 0.024 to 0.026; the power range of the seventh lens 7 is: 0 to 0.002; the eighth lens 8 has an optical power range of: -0.04 to-0.038; the focal length range of the ninth lens 9 is: -0.068 to-0.066; the tenth lens 10 has a focal length in the range of: 0.038 to 0.04; the focal length range of the eleventh lens 11 is: 0.075 to 0.077. In this embodiment, the system parameters that can be obtained for the optical projection system are: focal length of system: 2.5 mm-3 mm; angle of view: 53-59 degrees; like circle diameter: 8.5 mm-9.1 mm; system F number: 1.65 to 1.75. The system is suitable for 0.23"DMD TR 0.5 140%offset design.
Specifically, referring to fig. 6, the surface of the first lens 1 close to the magnification side is a convex surface, and the surface far from the magnification side is a concave surface; the surface of the second lens 2 adjacent to the first lens 1 is a convex surface, and the surface of the second lens adjacent to the third lens 3 is a concave surface; the surface of the third lens 3 adjacent to the second lens 2 is a concave surface, and the surface adjacent to the fourth lens 4 is a concave surface; the surface of the fourth lens 4 adjacent to the third lens 3 is convex, and the surface adjacent to the fifth lens 5 is convex. The surface of the fifth lens 5 adjacent to the fourth lens 4 is convex, and the surface adjacent to the sixth lens 6 is flat. The surface of the sixth lens 6 adjacent to the fifth lens 5 is convex, and the surface adjacent to the seventh lens 7 is convex. The surface of the seventh lens 7 adjacent to the sixth lens 6 is a concave surface, and the surface adjacent to the diaphragm 12 is a plane; the surface of the eighth lens 8 adjacent to the diaphragm 12 is a flat surface, and the surface of the eighth lens adjacent to the ninth lens 9 is a convex surface. The surface of the ninth lens 9 adjacent to the eighth lens 8 is a concave surface, and the surface adjacent to the tenth lens 10 is a concave surface. The surface of the tenth lens 10 adjacent to the ninth lens 9 is a convex surface, and the surface adjacent to the eleventh lens 11 is a convex surface; the surface of the eleventh lens 11 disposed adjacent to the tenth lens 10 is convex, and the surface closest to the image source 13 is convex.
The specific parameters of each lens are shown in table 9 below:
in the present embodiment, the first lens 1 is an aspherical lens, and the eleventh lens 11 is an aspherical lens, and the remaining lenses are spherical lenses. Wherein the spherical parameters corresponding to the aspherical lenses are shown in table 10:
the field parameters of the optical imaging module obtained through measurement are shown in fig. 7 to 10.
As shown in fig. 7, is a color difference diagram of the optical projection system. As can be seen from the figure, the color difference value is smaller than 4um in the visible spectrum band, and the color reproducibility of the image is higher.
As shown in fig. 8, the Distortion (Distortion) value of the optical projection system is less than 0.5% (usually less than 1%) as shown in the graph, and the Distortion imaged by the system under each view field is smaller, so that the requirement of human eyes on Distortion can be completely met.
The modulation transfer function diagram (modulation transfer function, MTF) of the present embodiment is shown in fig. 9). Fig. 9 is a graph of modulation transfer functions of the projection optical system at different image heights. Wherein the horizontal axis is spatial frequency (Spatial Frequency in cycles per mm) and the vertical axis is OTF modulus (Modulus of the OTF). It is understood from the figure that the OTF mode value of an image can be kept at 0.5 or more throughout the interval of 0mm to 93mm in spatial frequency, and generally the quality of an image is higher as the OTF mode value is closer to 1, but since there is no case where the OTF mode value is 1 due to the influence of various factors, it is generally known that the optical projection system of the present embodiment has higher imaging quality when the OTF mode value can be kept at 0.5 or more, that is, it means that an image has high imaging quality and the definition of a picture is excellent.
As shown in fig. 10, which is a defocus graph of the present embodiment, it can be seen from the graph that the defocus amount of the optical projection system under visible light is small.
Example 6
Example 6 differs from example 5 in that: the radius of curvature of each lens, and the parameters of the aspherical lens are different. In this example, specific parameters of each lens are shown in table 11 below:
in the present embodiment, the first lens 1 is an aspherical lens, and the eleventh lens 11 is an aspherical lens, and the remaining lenses are spherical lenses. Wherein the spherical parameters corresponding to the aspherical lenses are shown in table 12:
in this embodiment, the system parameters that can be obtained for the optical projection system are: focal length of system: 2.5 mm-3 mm; angle of view: 53-59 degrees; like circle diameter: 8.5 mm-9.1 mm; system F number: 1.65 to 1.75. The system is suitable for 0.23"DMD TR 0.5 140%offset design.
The modulation transfer function diagram (modulation transfer function, MTF) of the present embodiment is shown in fig. 11). Fig. 11 is a graph of modulation transfer functions of the projection optical system at different image heights. Wherein the horizontal axis is spatial frequency (Spatial Frequency in cycles per mm) and the vertical axis is OTF modulus (Modulus of the OTF). It is understood from the figure that the OTF mode value of an image can be kept at 0.5 or more throughout the interval of 0mm to 93mm in spatial frequency, and generally the quality of an image is higher as the OTF mode value is closer to 1, but since there is no case where the OTF mode value is 1 due to the influence of various factors, it is generally known that the optical projection system of the present embodiment has higher imaging quality when the OTF mode value can be kept at 0.5 or more, that is, it means that an image has high imaging quality and the definition of a picture is excellent.
Example 7
Example 7 differs from example 5 in that: the radius of curvature of each lens, and the parameters of the aspherical lens are different. In this example, specific parameters of each lens are shown in table 13 below:
in the present embodiment, the first lens 1 is an aspherical lens, and the eleventh lens 11 is an aspherical lens, and the remaining lenses are spherical lenses. Wherein the spherical parameters corresponding to the aspherical lenses are shown in table 14:
in this embodiment, the system parameters that can be obtained for the optical projection system are: focal length of system: 2.5 mm-3 mm; angle of view: 53-59 degrees; like circle diameter: 8.5 mm-9.1 mm; system F number: 1.65 to 1.75. The system is suitable for 0.23"DMD TR 0.5 140%offset design.
The modulation transfer function diagram (modulation transfer function, MTF) of the present embodiment is shown in fig. 12). Fig. 12 is a graph of modulation transfer functions of the projection optical system at different image heights. Wherein the horizontal axis is spatial frequency (Spatial Frequency in cycles per mm) and the vertical axis is OTF modulus (Modulus of the OTF). It is understood from the figure that the OTF mode value of an image can be kept at 0.5 or more throughout the interval of 0mm to 93mm in spatial frequency, and generally the quality of an image is higher as the OTF mode value is closer to 1, but since there is no case where the OTF mode value is 1 due to the influence of various factors, it is generally known that the optical projection system of the present embodiment has higher imaging quality when the OTF mode value can be kept at 0.5 or more, that is, it means that an image has high imaging quality and the definition of a picture is excellent.
Example 8
Example 8 differs from example 5 in that: the radius of curvature of each lens, and the parameters of the aspherical lens are different. In this example, specific parameters of each lens are shown in table 15 below:
in the present embodiment, the first lens 1 is an aspherical lens, and the eleventh lens 11 is an aspherical lens, and the remaining lenses are spherical lenses. Wherein the spherical parameters corresponding to the aspherical lenses are shown in table 16:
in this embodiment, the system parameters that can be obtained for the optical projection system are: focal length of system: 2.5 mm-3 mm; angle of view: 53-59 degrees; like circle diameter: 8.5 mm-9.1 mm; system F number: 1.65 to 1.75. The system is suitable for 0.23"DMD TR 0.5 140%offset design.
The modulation transfer function diagram (modulation transfer function, MTF) of the present embodiment is shown in fig. 13). Fig. 13 is a graph of modulation transfer functions of the projection optical system at different image heights. Wherein the horizontal axis is spatial frequency (Spatial Frequency in cycles per mm) and the vertical axis is OTF modulus (Modulus of the OTF). It is understood from the figure that the OTF mode value of an image can be kept at 0.5 or more throughout the interval of 0mm to 93mm in spatial frequency, and generally the quality of an image is higher as the OTF mode value is closer to 1, but since there is no case where the OTF mode value is 1 due to the influence of various factors, it is generally known that the optical projection system of the present embodiment has higher imaging quality when the OTF mode value can be kept at 0.5 or more, that is, it means that an image has high imaging quality and the definition of a picture is excellent.
The foregoing embodiments mainly describe differences between the embodiments, and as long as there is no contradiction between different optimization features of the embodiments, the embodiments may be combined to form a better embodiment, and in consideration of brevity of line text, no further description is given here.
While certain specific embodiments of the application have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.
Claims (8)
1. An optical projection system, comprising, in order from an enlargement side to a reduction side: a first lens group (30) and a second lens group (40), wherein a diaphragm (12) is arranged between the first lens group (30) and the second lens group (40); the focal power of the first lens group (30) is negative, and the focal power of the second lens group (40) is positive; the second lens group (40) comprises a first sub-lens group (20) close to the diaphragm (12) and a second sub-lens group far away from the diaphragm (12), a first air interval is arranged between the first sub-lens group (20) and the diaphragm (12), a second air interval is arranged between the first sub-lens group (20) and the second sub-lens group, the first air interval is 2% -6% of the total optical length of the optical projection system, and the second air interval is smaller than 1mm;
the first lens group (30) comprises a first lens (1), a second lens (2), a third lens (3) and a third sub-lens group from the enlargement side to the reduction side, wherein the focal power of the first lens (1), the second lens (2) and the third lens (3) is negative, and the focal power of the third sub-lens group is positive;
from the enlargement side to the reduction side, the first sub-lens group (20) includes an eighth lens (8), a ninth lens (9), a tenth lens (10), the second sub-lens group includes an eleventh lens (11), optical powers of the eighth lens (8), the tenth lens (10), and the eleventh lens (11) are positive, and optical powers of the ninth lens (9) are negative;
wherein the optical component with refractive power in the optical projection system is only the lens.
2. An optical projection system according to claim 1, characterized in that the first sub-lens group (20) is a cemented lens group and the second sub-lens group is an aspherical lens.
3. An optical projection system according to claim 1, characterized in that the third sub-lens group comprises a fourth lens, the optical power of the fourth lens (4) being positive.
4. An optical projection system according to claim 1, characterized in that the third sub-lens group comprises a fourth lens (4), a fifth lens (5), a sixth lens (6) and a seventh lens (7), wherein in the fourth lens (4), the fifth lens (5), the sixth lens (6) and the seventh lens (7) the optical powers of adjacent lenses are opposite.
5. An optical projection system according to claim 4, characterized in that the fourth lens (4) and the fifth lens (5) are cemented, and the sixth lens (6) and the seventh lens (7) are cemented.
6. An optical projection system according to claim 1, characterized in that the first lens (1) is an aspherical lens, the air space between the first lens (1) and the second lens (2) being larger than 10mm.
7. An optical projection system according to claim 1, characterized in that the refractive index of the eighth lens (8) and the tenth lens (10) is smaller than the refractive index of the ninth lens (9).
8. An electronic device comprising an optical projection system according to any of claims 1-7.
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| CN114942561B (en) * | 2022-07-26 | 2022-11-22 | 歌尔光学科技有限公司 | Optical projection system and electronic equipment |
| CN115616743B (en) * | 2022-12-02 | 2023-04-18 | 歌尔光学科技有限公司 | Optical projection system and electronic equipment |
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