CN114690377B - Optical projection system and electronic equipment - Google Patents
Optical projection system and electronic equipment Download PDFInfo
- Publication number
- CN114690377B CN114690377B CN202210343112.1A CN202210343112A CN114690377B CN 114690377 B CN114690377 B CN 114690377B CN 202210343112 A CN202210343112 A CN 202210343112A CN 114690377 B CN114690377 B CN 114690377B
- Authority
- CN
- China
- Prior art keywords
- lens
- lens group
- projection system
- optical projection
- optical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 149
- 230000009467 reduction Effects 0.000 claims abstract description 23
- 238000004026 adhesive bonding Methods 0.000 claims 2
- 230000000694 effects Effects 0.000 description 20
- 230000004075 alteration Effects 0.000 description 19
- 238000003384 imaging method Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 12
- 238000013461 design Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 8
- 238000012546 transfer Methods 0.000 description 8
- 238000012937 correction Methods 0.000 description 5
- 238000012634 optical imaging Methods 0.000 description 4
- 239000005357 flat glass Substances 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 238000000034 method Methods 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
- 239000011521 glass Substances 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000008569 process Effects 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
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The application discloses an optical projection system and electronic equipment. From a magnification side to a reduction side, the optical projection system includes: a first lens group and a second lens group, wherein the focal power of the first lens group is negative, and the focal power of the second lens group is positive; the first lens group comprises at least one lens, and the focal power range of the lens is as follows: -0.18-0.15.
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
Digital Light Processing (DLP) technology is currently being widely used in electronic products or devices to achieve miniature projection. In such projection systems, the size and quality of the projected image is typically determined by the DLP system. In some application scenes, the projection lens of the DLP system can block the vision of the audience or the image of the audience, so that the display effects such as definition of the projection picture are affected.
Therefore, there is a need to design a projection device with simple structure and good projection effect.
Disclosure of Invention
An object of the present application is to provide a new technical solution for an optical projection system and an electronic device.
According to a first aspect of embodiments of the present application, an optical projection system is provided. From a magnification side to a reduction side, the optical projection system includes: a first lens group and a second lens group, the first lens group 30 having negative optical power and the second lens group having positive optical power;
the first lens group comprises at least one lens, and the focal power range of the lens is as follows: -0.18 to-0.15.
Optionally, the first lens group includes at least three lenses, and in the first lens group, a sum of powers of the first three lenses near the magnification side is: -0.18 to-0.15.
Optionally, the first lens group includes at least two lenses, and in the first lens group, a sum of powers of the first two lenses near the magnification side is-0.12 to-0.11.
Optionally, the second lens group includes at least three lenses, and in the second lens group, the first three lenses near the magnification side are cemented to form three cemented lenses, wherein the refractive index of the lens with positive optical power is smaller than the refractive index of the lens with negative optical power.
Optionally, from the enlargement side to the reduction side, the first lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; from the enlargement side to the reduction side, the order of the optical power of the first lens group is: negative positive negative, or the focal power sequence of the first lens group is negative positive.
Optionally, the fifth lens and the sixth lens are adhesively connected.
Optionally, the third lens and the fourth lens are adhesively connected.
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 a seventh lens, an eighth lens, a ninth lens, and a tenth lens from the magnification side to the reduction side, and the order of optical power of the second lens group from the magnification side to the reduction side is: positive and negative.
Optionally, the seventh lens, the eighth lens and the ninth lens are cemented together to form a triple cemented lens.
Optionally, the tenth lens is an aspheric lens, and an air space between the triple cemented lens and the tenth lens is less than 1mm and greater than 0.1mm.
Optionally, a diaphragm is disposed between the first lens group and the second lens group, a first air space is disposed between the first lens group and the diaphragm, the first air space is greater than 7mm and less than 10mm, the first air space is 9% -13% of the total optical length of the optical projection system, a second air space is disposed between the second lens group and the diaphragm, and the second air space is 3% -6% of the total optical length of the optical projection system.
According to a second aspect of embodiments of the present application, an electronic device is provided. The electronic device comprises an optical projection system as described in the first aspect.
In an embodiment of the present application, an optical projection system is provided. The application defines the lens power of the first lens group in the optical projection system, and further defines the light deflection capability of the optical projection system. In this application embodiment, the first lens group can be with the light beam convergence (if according to actual projection effect, for diverging the light beam), guaranteed that the incident angle of light entering second lens group can not be too big, light all propagates in the second lens, in actual projection, limited the deflection ability of optical projection system to light, avoided sheltering from spectator's sight or by spectator's phenomenon of sheltering from the image, promoted the imaging effect of projection picture.
Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the present 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 diagram illustrating a first configuration of an optical projection system according to an embodiment of 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 second block diagram of the optical projection system according to the embodiment of 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 schematic diagram of the optical path of the optical projection system of FIG. 1.
FIG. 12 is a schematic diagram of the optical path of the optical projection system of FIG. 6.
Reference numerals illustrate:
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. a diaphragm; 12. an image source; 13. a sheet glass; 14. a prism; 30. a first lens group; 40. and a second lens group.
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 application provides an optical projection system, which is applied to a projector or an illumination light machine.
Referring to fig. 1, 11, and 6 and 12, the optical projection system includes, from an enlargement side to a reduction side: a first lens group 30 and a second lens group 40, the first lens group 30 having a negative optical power and the second lens group 40 having a positive optical power; the first lens group 30 includes at least one lens having an optical power range of: -0.18 to-0.15.
In other words, the optical projection system of the present application is applied to a projection apparatus including a reduction side and a magnification side in a light transmission direction, and the image source 12, the flat glass 13, the prism 14, the second lens group 40, and the first lens group 30 in the optical projection system are disposed between the reduction side and the magnification side in this order along the same optical axis. The reduction side is the side where the image source 12 (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.
Specifically, in the actual projection process, projection light is emitted from the image source 12 from the reduction side toward the enlargement side, and sequentially passes through the plate glass 13, the prism 14, the second lens group 40, and the first lens group 30, thereby displaying a projection image.
In the present embodiment, the image source 12 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 0.23"dmd, with a throw ratio of 0.5, 144% offset design. Of course, the image source 12 may alternatively be a liquid crystal on silicon (LiquidCrystal On Silicon, LCOS) chip or other display device for emitting light, which is not limited in this application.
Wherein the power of the first lens group 30 is negative and the power of the second lens group 40 is positive for the entire optical projection system, the first lens group 30 and the second lens group 40 ensuring the power balance of the entire optical projection system.
In this embodiment, the focal power of the lenses in the first lens group 30 is limited, when the optical projection system is simulated, the first lens group 30 of the optical projection system deflects incident light, the incident light can enter the optical projection system at a larger negative incidence angle, and finally enter the second lens group 40 at a smaller positive incidence angle, so that the angle of the light entering the second lens group 40 is not too large, that is, the first lens group 30 has a beam converging effect on the light, so that the light beam converges (diverges the light beam if the actual projection effect is achieved), in use, the light emitted by the image source 12 firstly enters the second lens group 40, specifically, the light emitted by the image source 12 enters the second lens group 40 at a smaller positive incidence angle, the light emitted by the image source 12 is transmitted to the first lens group 30 through the second lens group 40, and finally projected onto a wall or a desktop at a larger negative incidence angle, thereby avoiding the phenomenon of shielding the view of a viewer or the image of the viewer, and improving the imaging effect of the projection screen.
In one embodiment, referring to fig. 1, the first lens group 30 includes at least three lenses, and in the first lens group 30, the sum of powers of the first three lenses near the magnification side is: -0.18 to-0.15.
In this embodiment, the sum of the powers of the first three lenses of the first lens group 30 far from the second lens group 40 is limited, 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 first lens 1 at a larger negative incident angle, the first lens group 30 deflects the incident light, the incident angle is basically 0 ° when reaching the third lens 3, and the incident light enters the second lens group 40 at a smaller positive incident angle when reaching the second lens group 40, so that the angle of the incident light entering the second lens group 40 is not too large. In this embodiment, the first lens group 30 will shrink the incident light from about-56 ° to 0 ° and expand to about +20°, ensuring that the angle of light entering the second lens group is not too large.
In one embodiment, referring to fig. 6, the first lens group 30 includes at least two lenses, and in the first lens group 30, the sum of powers of the first two lenses near the magnification side is-0.12 to-0.11.
In this embodiment, the sum of the powers of the first two lenses of the first lens group 30 far from the second lens group 40 is limited, 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 first lens 1 at a larger negative incident angle, the first lens group 30 deflects the incident light, the incident angle is basically 0 ° when reaching the third lens 3, and the incident light enters the second lens group 40 at a smaller positive incident angle when reaching the second lens group 40, so that the angle of the incident light entering the second lens group 40 is not too large. In this embodiment, the first lens group 30 condenses the incident light from-56 ° or so to 0 °, so that the light can smoothly enter the second lens group 40, which is advantageous for aberration correction.
In one embodiment, the second lens group 40 includes at least three lenses, and in the second lens group 40, the first three lenses near the magnifying side are cemented to form three cemented lenses, wherein the refractive index of the lens having positive optical power is smaller than the refractive index of the lens having negative optical power.
In this embodiment, in order to ensure that the optical power of the second lens group 40 is positive, the number of lenses whose optical power is positive is greater than the number of lenses whose optical power is negative in the second lens group 40. In addition, in this embodiment, the refractive index of the lens having positive power is smaller than that of the lens having negative power, and the triple cemented lens of the combination of high refractive index and low refractive index is advantageous in eliminating chromatic aberration. In an alternative embodiment, the refractive index of the lens with positive optical power in the triple cemented lens ranges from 1.48 to 1.6, and the refractive index of the lens with negative optical power ranges from 1.85 to 1.95.
In one embodiment, referring to fig. 1 and 6, the first lens group 30 includes, from an enlargement side to a reduction side, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, and a sixth lens 6; from the enlargement side to the reduction side, the order of the powers of the first lens group 30 is: negative positive negative, or the order of power of the first lens group 30 is negative positive.
In this embodiment, in order to ensure that the optical power of the first lens group 30 is negative, the number of lenses in which the optical power is negative is greater than the number of lenses in which the optical power is positive in the first lens group. The present embodiment balances the power of the first lens group 30 by reasonably distributing the power of the lenses in the first lens group. In addition, by reasonably distributing the optical power of the lenses in the first lens group, the deflection capability of the first lens group 30 to light rays is limited, and the incident angle of the light rays entering the second lens group is prevented from being too large.
In this embodiment, the focal power of the front three lenses of the first lens group 30 is negative, and the focal power of the lens group of the rear three lenses is positive. Specifically, since the first three lenses in the first lens group 30 all provide negative power, the aberrations are negative, and since the power of the lens group is positive, the lens group can cancel a portion of the negative power, weakening the aberrations imaged by the first lens group. The first lens group can eliminate aberration during imaging.
In one embodiment, referring to fig. 1, the fifth lens 5 and the sixth lens 6 are bonded together.
In this embodiment, the first lens group 30 includes the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, and the sixth lens 6, and the order of optical power of the first lens group 30 is: negative positive negative. Wherein the fifth lens 5 and said sixth lens 6 are cemented together to form a cemented lens.
In this embodiment, the fifth lens 5 and the sixth lens 6 are cemented to form a cemented lens to correct problems such as chromatic aberration occurring during imaging. In one embodiment, the diaphragm 11 is disposed between the first lens group 30 and the second lens group 40, and a cemented lens formed by the fifth lens 5 and the sixth lens 6 cemented together is disposed near the diaphragm 11 to further enhance the chromatic aberration eliminating capability.
In a specific embodiment, referring to fig. 1, the sum of the powers of the first lens 1, the second lens 2 and the third lens 3 is: -0.18 to-0.15.
In this embodiment, the first lens group 30 includes the first lens 1, the second lens 2, and the third lens 3, wherein the optical powers of the first lens 1, the second lens 2, and the third lens 3 are all negative, that is, the optical powers of the first three lenses near the magnification side in the first lens group 30 are all negative. The present embodiment defines the optical power of the first three lenses of the first lens group 30 far from the second lens group 40, while defining the sum of the optical powers of the first three lenses. Specifically, 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 first lens 1 at a larger negative incident angle, the first lens group 30 deflects the incident light, the incident angle of the incident light is basically 0 ° when reaching the third lens 3, and the incident light enters the second lens group 40 at a smaller positive incident angle when reaching the second lens group 40, so that the angle of the incident light entering the second lens group 40 is not too large. In this embodiment, the first lens group contracts the incident light from about-56 ° to about 0 ° and expands the incident light to about +20°, ensuring that the angle at which the light enters the second lens group is not too large.
In one embodiment, referring to fig. 6, the third lens 3 and the fourth lens 4 are bonded together.
In this embodiment, the first lens group 30 includes the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, and the sixth lens 6, and the order of optical power of the first lens group 30 is: negative positive. Wherein the third lens 3 and said fourth lens are four cemented together to form a cemented lens. In this embodiment, the fifth lens 5 and the sixth lens 6 are cemented to form a cemented lens to correct problems such as chromatic aberration occurring during imaging.
In a specific embodiment, the sum of the powers of the first lens 1 and the second lens 2 is: -0.12 to-0.11.
The first lens group 30 includes a first lens 1 and a second lens 2, wherein the optical powers of the first lens 1 and the second lens 2 are both negative, that is, the optical powers of the first two lenses of the first lens group 30 near the magnification side are both negative. The present embodiment defines the powers of the first two lenses of the first lens group 30 far from the second lens group 40, while defining the sum of the powers of the first two lenses. Specifically, 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 first lens 1 at a larger negative incident angle, the first lens group 30 deflects the incident light, the incident angle of the incident light is basically 0 ° when reaching the third lens 3, and the incident light enters the second lens group 40 at a smaller positive incident angle when reaching the second lens group 40, so that the angle of the incident light entering the second lens group 40 is not too large. In this embodiment, the first lens group 30 condenses the incident light from-56 ° or so to 0 °, so that the light can smoothly enter the second lens group 40, which is advantageous for aberration correction.
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 12 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 1 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 an alternative embodiment, in order to reduce the overall volume of the optical projection system without affecting the correction effect of the aspherical lens on the aberrations, the air gap between the first lens 1 and the second lens 2 is larger than 13mm and smaller than 15mm.
In one embodiment, the second lens group 40 includes a seventh lens, an eighth lens 8, a ninth lens 9, and a tenth lens 10 from the enlargement side to the reduction side, and the order of optical power of the second lens group 40 from the enlargement side to the reduction side is: positive and negative.
In a specific embodiment, the seventh lens 7, the eighth lens 8 and the ninth lens 9 are cemented together to form a cemented lens, wherein the refractive index of the lens with positive optical power is smaller than the refractive index of the lens with negative optical power.
In this embodiment, the seventh lens 7, the eighth lens 8, and the ninth lens 9 in the second lens group 40 are cemented together to form a triple cemented lens, wherein in the second lens group 40, the triple cemented lens is disposed closest to the magnification side, and the tenth lens 10 is disposed closest to the image source 12, that is, in the case where the first lens group 30 and the second lens group 40 are provided with the diaphragm 11, the triple cemented lens is disposed in the vicinity of the diaphragm 11 to further enhance the effect of eliminating chromatic aberration.
In one embodiment, the optical powers of the seventh lens 7, the ninth lens 9 and the tenth lens 10 are all positive, and the optical power of the eighth lens 8 is negative, wherein the refractive index of the lens with positive optical power is smaller than the refractive index of the lens with negative optical power.
In this embodiment, in order to ensure that the optical power of the second lens group 40 is positive, the number of lenses whose optical power is positive is greater than the number of lenses whose optical power is negative in the second lens group 40. In addition, in this embodiment, the refractive index of the lens having positive power is smaller than that of the lens having negative power, and the triple cemented lens of the combination of high refractive index and low refractive index is advantageous in eliminating chromatic aberration. In an alternative embodiment, the refractive index of the lens with positive optical power in the triple cemented lens ranges from 1.48 to 1.6, and the refractive index of the lens with negative optical power ranges from 1.85 to 1.95.
In one embodiment, the tenth lens 10 is an aspherical lens, and the air space between the triple cemented lens and the tenth lens 10 is less than 1mm and greater than 0.1mm.
In this embodiment, the tenth lens 10 is an aspherical lens, i.e., in the second lens group 40, the lens closest to the image source 12 is an aspherical lens, i.e., in the second lens group 40, the lens furthest from the magnification side is an aspherical lens. Setting the tenth lens 10 as an aspherical lens reduces the edge aberration and improves the imaging effect of the optical projection system.
The present embodiment defines the air space between the triple cemented lens and the tenth lens 10, further enhancing the correction effect of the aspherical lens on aberrations of 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. Therefore, the present embodiment defines that the air space between the three cemented lens and the tenth lens 10 is smaller than 1mm and larger than 0.1mm, so that the overall volume of the optical projection system is reduced, and the correction effect of the aspherical lens on the aberration is not affected.
In an alternative embodiment, the first lens 1 in the first lens group 30 is an aspherical lens, and the material of the aspherical lens may be a plastic material. The image source 12 generates a lot of heat during operation, the first lens 1 is arranged away from the image source 12, i.e. the first lens 1 is arranged away from the heat source, and the material of the first lens 1 is arranged as a plastic material, so as to reduce the manufacturing cost of the whole first lens group 30 and the overall weight of the lens group.
The tenth lens 10 in the second lens group 40 is an aspherical lens, and the material of the aspherical lens may be a glass material. The image source 12 generates a lot of heat during operation, the tenth lens 10 is disposed closest to the image source 12, i.e. the tenth lens 10 is disposed closest to the heat source, and the material of the tenth lens 10 is set to be a low-cost glass material, so that the manufacturing cost of the optical imaging lens using the second lens group 40 is reduced while ensuring higher imaging quality and temperature stability.
In one embodiment, the diaphragm 11 is disposed between the first lens group 30 and the second lens group 40, a first air space is provided between the first lens group 30 and the diaphragm 11, the first air space is greater than 7mm and less than 10mm, the first air space is 9% -13% of the total optical length of the optical projection system, and a second air space is provided between the second lens group 40 and the diaphragm 11, and the second air space is 3% -6% of the total optical length of the optical projection system.
In this embodiment, the air space between the first lens group 30 and the aperture stop 11 and the air space between the second lens group 40 and the aperture stop 11 are defined, and in the case where the imaging effect is satisfied, the structure of the optical projection system is made more compact.
According to a second aspect of embodiments of the present application, an electronic device is provided. The electronic device comprises the optical projection system of 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:
referring to fig. 1, the optical projection system includes, from a magnification side to a 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, and a tenth lens 10. Wherein a diaphragm 11 is arranged between the sixth lens 6 and the seventh lens 7. The fifth lens 5 and the sixth lens 6 are bonded together. A seventh lens 7, an eighth lens 8, and a ninth lens 9. The optical power arrangement sequence of the optical projection system is as follows: negative positive negative/positive. In this embodiment, the system parameters of 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 0.5 144%offset design.
Specifically, referring to fig. 1, 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 convex. The surface of the sixth lens 6 adjacent to the fifth lens 5 is concave, and the surface adjacent to the diaphragm 11 is convex. The surface of the seventh lens 7 adjacent to the diaphragm 11 is a flat surface, and the surface adjacent to the eighth lens 8 is a convex surface. The eighth lens 8 has a concave surface adjacent to the seventh lens 7 and a concave surface adjacent to the ninth lens 9. The surface of the ninth lens 9 adjacent to the eighth lens 8 is a convex surface, and the surface adjacent to the tenth lens 10 is a convex surface; the surface of the tenth lens 10 adjacent to the ninth lens 9 is convex, and the surface closest to the prism 14 is convex.
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 tenth lens 10 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:
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 3um 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 tenth lens 10 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 embodiment, the system parameters of the optical projection system that can be obtained 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 0.5 144%offset design.
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 tenth lens 10 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 embodiment, the system parameters of the optical projection system that can be obtained 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 0.5 144%offset design.
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 tenth lens 10 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 embodiment, the system parameters of the optical projection system that can be obtained 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 0.5 144%offset design. 0.23"DMD TR 0.5 140%offset.
Example 5:
in a specific embodiment, referring to fig. 6 and 12, 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, a fourth lens 4, a fifth lens 5, and a sixth lens 6, and the order of optical power of the first lens group 30 is: negative positive. The third lens 3 and the fourth lens 4 are bonded together. The second lens group 40 includes, from the enlargement side to the reduction side, a seventh lens 7, an eighth lens 8, a ninth lens 9, and a tenth lens 10, and the order of optical power of the second lens group 40 is: positive and negative. Wherein the seventh lens 7, the eighth lens 8 and the ninth lens 9 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 concave 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 fifth lens 5 is a convex surface; a concave surface of the fifth lens 5 adjacent to the fourth lens 4 and a convex surface of the fifth lens 6 adjacent to the sixth lens; the surface of the sixth lens 6 adjacent to the fifth lens 5 is a convex surface, and the surface adjacent to the diaphragm 11 is a plane; the surface of the seventh lens 7 adjacent to the diaphragm 11 is a convex surface, and the surface adjacent to the eighth lens 8 is a convex surface; the surface of the eighth lens 8 adjacent to the seventh lens 7 is a concave surface, and the surface of the eighth lens 9 adjacent to the ninth lens is a concave surface; the surface of the ninth lens 9 adjacent to the eighth lens 8 is a convex surface, and the surface adjacent to the tenth lens 10 is a convex surface; in the tenth lens 10, a surface provided adjacent to the ninth lens 9 is a convex surface, and a surface provided adjacent to the prism 14 is a convex surface.
The system is suitable for 0.23"DMD TR 0.5 144%offset design.
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 fifth lens 5, a sixth lens 6, a diaphragm 11, a seventh lens 7, an eighth lens 8, a ninth lens 9, and a tenth lens 10.
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 tenth lens 10 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:
in this example, using a 0.23"dmd,144% offset design, the optical projection system can achieve the following effects: projection ratio: 0.5, optical system focal length: 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 field parameters of the optical imaging module obtained through measurement are shown in fig. 6 to 9.
As shown in fig. 6, 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. 7, 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. 8). Fig. 8 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. 9, 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, thickness, and parameters of the aspherical lens are different for each lens. 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 tenth lens 10 is an aspherical lens, and the remaining lenses are spherical lenses. Wherein the spherical parameters corresponding to the aspherical lenses are shown in table 11:
in this example, using a 0.23"dmd,144% offset design, the optical projection system can achieve the following effects: projection ratio: 0.5, optical system focal length: 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.
Example 7
Example 7 differs from example 5 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 12 below:
in the present embodiment, the first lens 1 is an aspherical lens, and the tenth lens 10 is an aspherical lens, and the remaining lenses are spherical lenses. Wherein the spherical parameters corresponding to the aspherical lenses are shown in table 11:
in this example, using a 0.23"dmd,144% offset design, the optical projection system can achieve the following effects: projection ratio: 0.5, optical system focal length: 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 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.
Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the application is defined by the appended claims.
Claims (9)
1. An optical projection system, characterized in that the optical projection system is composed of a first lens group (30) and a second lens group (40) from a magnification side to a reduction side, the optical power of the first lens group (30) is negative, and the optical power of the second lens group (40) is positive;
the first lens group (30) is composed of six lenses, and the focal power of the six lenses in the first lens group (30) is as follows in sequence from the enlargement side to the reduction side: negative, positive, negative; or negative, positive, negative, positive; in the first lens group (30), the sum of the powers of the first three lenses near the magnification side is: -0.18 to-0.15; or in the first lens group (30), the sum of the powers of the first two lenses near the magnification side is-0.12 to-0.11;
the second lens group (40) is composed of four lenses, in the second lens group (40), the first three lenses close to the amplifying side are connected in a gluing way to form three gluing lenses, and from the amplifying side to the shrinking side, the focal power of the four lenses in the second lens group (40) is as follows: positive, negative, positive;
a diaphragm (11) is arranged between the first lens group (30) and the second lens group (40), a first air interval is arranged between the first lens group (30) and the diaphragm (11), the first air interval is larger than 7mm and smaller than 10mm, the first air interval is 9% -13% of the total optical length of the optical projection system, a second air interval is arranged between the second lens group (40) and the diaphragm (11), and the second air interval is 3% -6% of the total optical length of the optical projection system.
2. An optical projection system according to claim 1, wherein the refractive index of the lens having positive optical power is smaller than the refractive index of the lens having negative optical power.
3. An optical projection system according to claim 1, characterized in that the first lens group (30) consists of a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5) and a sixth lens (6) from the magnification side to the de-magnification side.
4. An optical projection system according to claim 3, characterized in that the fifth lens (5) and the sixth lens (6) are glued together.
5. An optical projection system according to claim 3, characterized in that the third lens (3) and the fourth lens (4) are glued together.
6. An optical projection system according to claim 5, 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 second lens group (40) consists of a seventh lens (7), an eighth lens (8), a ninth lens (9) and a tenth lens (10) from the enlargement side to the reduction side.
8. An optical projection system according to claim 7, characterized in that the tenth lens (10) is an aspherical lens, the air space between the triple cemented lens and the tenth lens (10) being less than 1mm and more than 0.1mm.
9. An electronic device comprising an optical projection system according to any of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210343112.1A CN114690377B (en) | 2022-03-31 | 2022-03-31 | Optical projection system and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210343112.1A CN114690377B (en) | 2022-03-31 | 2022-03-31 | Optical projection system and electronic equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114690377A CN114690377A (en) | 2022-07-01 |
| CN114690377B true CN114690377B (en) | 2024-03-19 |
Family
ID=82140692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210343112.1A Active CN114690377B (en) | 2022-03-31 | 2022-03-31 | Optical projection system and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114690377B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114924380B (en) * | 2022-04-29 | 2023-08-04 | 歌尔光学科技有限公司 | Optical projection system and electronic equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901586A (en) * | 2014-04-13 | 2014-07-02 | 浙江舜宇光学有限公司 | 3D interaction-type projection lens |
| CN108089279A (en) * | 2016-11-21 | 2018-05-29 | 精工爱普生株式会社 | Taking lens system, photographic device and projecting apparatus |
| CN111552061A (en) * | 2020-07-01 | 2020-08-18 | 湖南长步道光学科技有限公司 | Optical system of projection lens |
| CN113359277A (en) * | 2021-05-31 | 2021-09-07 | 歌尔光学科技有限公司 | Optical system and projection apparatus |
| CN215264203U (en) * | 2021-06-30 | 2021-12-21 | 歌尔光学科技有限公司 | Projection lens and projection equipment |
| CN114137783A (en) * | 2021-12-23 | 2022-03-04 | 广景视睿科技（深圳）有限公司 | Projection lens and projector |
-
2022
- 2022-03-31 CN CN202210343112.1A patent/CN114690377B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901586A (en) * | 2014-04-13 | 2014-07-02 | 浙江舜宇光学有限公司 | 3D interaction-type projection lens |
| CN108089279A (en) * | 2016-11-21 | 2018-05-29 | 精工爱普生株式会社 | Taking lens system, photographic device and projecting apparatus |
| CN111552061A (en) * | 2020-07-01 | 2020-08-18 | 湖南长步道光学科技有限公司 | Optical system of projection lens |
| CN113359277A (en) * | 2021-05-31 | 2021-09-07 | 歌尔光学科技有限公司 | Optical system and projection apparatus |
| CN215264203U (en) * | 2021-06-30 | 2021-12-21 | 歌尔光学科技有限公司 | Projection lens and projection equipment |
| CN114137783A (en) * | 2021-12-23 | 2022-03-04 | 广景视睿科技（深圳）有限公司 | Projection lens and projector |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114690377A (en) | 2022-07-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6575580B2 (en) | Lighting system and projection type display unit using thereof | |
| US7738190B2 (en) | Optical engine and wide angle projection lens module thereof | |
| CN107490844B (en) | Wide-angle projection lens | |
| US5760965A (en) | Wide-projection angle liquid crystal projection lens system | |
| US8213091B2 (en) | Wide-angle projection zoom lens and projection display device | |
| US20160077319A1 (en) | Projection-type video display device | |
| JP2006521584A (en) | Projection lens with a small number of elements for use in combination with a pixel panel | |
| JPH0926542A (en) | Retro-focus type lens | |
| CN114594574B (en) | Optical projection system and electronic equipment | |
| WO2022267383A1 (en) | Projection lens | |
| WO2023184752A1 (en) | Optical projection system and electronic device | |
| CN112987264A (en) | Ultra-short-focus projection lens with large view field and high brightness | |
| CN114690377B (en) | Optical projection system and electronic equipment | |
| CN113359277B (en) | Optical system and projection apparatus | |
| CN113311566A (en) | Low-cost ultra-short-focus projection lens | |
| CN114924380B (en) | Optical projection system and electronic equipment | |
| CN109491060B (en) | Ultrashort-focus objective lens for desktop projection | |
| CN115047591B (en) | Projection lens and projection device | |
| CN214751069U (en) | Projection lens and projection equipment | |
| CN116125637A (en) | Projection lens and projection device | |
| CN114545611A (en) | 4K ultra-short focus projection lens | |
| CN112578610B (en) | Projection lens and laser projection equipment | |
| CN113419329A (en) | Optical system and projection equipment | |
| CN114879348B (en) | Projection lens and electronic equipment | |
| TWI809587B (en) | Projection lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |