CN114942561A - Optical projection system and electronic equipment - Google Patents
Optical projection system and electronic equipment Download PDFInfo
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- CN114942561A CN114942561A CN202210886540.9A CN202210886540A CN114942561A CN 114942561 A CN114942561 A CN 114942561A CN 202210886540 A CN202210886540 A CN 202210886540A CN 114942561 A CN114942561 A CN 114942561A
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/142—Adjusting of projection optics
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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
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Abstract
The application discloses an optical projection system and an electronic device, wherein the optical projection system sequentially comprises a first lens group, a second lens group, a third lens group and a fourth lens group from an enlargement side to a reduction side; the focal power of the first lens group is negative, the focal power of the second lens group is negative, the focal power of the third lens group is positive, and the focal power of the fourth lens group is positive; the ratio of the total optical length of the optical projection system to the focal length f of the optical projection system is greater than or equal to 9.5 and less than or equal to 11.
Description
Technical Field
The present disclosure relates to the field of optical devices, and more particularly, to an optical projection system and an electronic device.
Background
With the rapid development of scientific technology, the projection technology has become mature day by day, and the application field of the projection device has become wider and wider, for example, the projection device is applied to the business fields such as conference explanation, tour display and sales promotion activities, the education fields such as school teaching and academic discussion, and the home field such as home theater. In recent years, Digital Light Processing (DLP) projectors have become the mainstream technology of projectors, and are the preferred choice in projection display products in terms of lightness, durability, high brightness, high contrast, etc.
Digital light processing projection systems in the prior art are mostly applied to interactive intelligent sound equipment, pocket type micro projectors, game machines and other equipment, but are rarely used in 3D printing equipment. Therefore, how to provide a digital light processing projection system which can meet the requirement of high-precision 3D printing equipment becomes one of the subjects of research in the industry.
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 the present application, there is provided an optical projection system comprising, in order from an enlargement side to a reduction side:
a first lens group, a second lens group, a third lens group and a fourth lens group;
the focal power of the first lens group is negative, the focal power of the second lens group is negative, the focal power of the third lens group is positive, and the focal power of the fourth lens group is positive;
the ratio of the total optical length of the optical projection system to the focal length f of the optical projection system is greater than or equal to 9.5 and less than or equal to 11.
Optionally, a ratio of a focal length f1 of the first lens group to a focal length f of the optical projection system is greater than or equal to 4.5 and less than or equal to 5.
Alternatively, the first lens group includes a first lens and a second lens arranged in this order from the magnification side to the reduction side.
Optionally, a ratio of a focal length f2 of the second lens group to a focal length f of the optical projection system is greater than or equal to 7 and less than or equal to 9.
Optionally, a ratio of a focal length f3 of the third lens group to a focal length f of the optical projection system is greater than or equal to 4 and less than or equal to 5.
Optionally, a ratio of a focal length f4 of the fourth lens group to a focal length f of the optical projection system is greater than or equal to 1.2 and less than or equal to 1.8.
Alternatively, the fourth lens group includes a fifth lens, a sixth lens, a seventh lens, and an eighth lens that are arranged in order from the magnification side to the reduction side.
Optionally, an abbe number of the eighth lens is less than 55.
Optionally, a first air space is provided between the first lens group and the second lens group, and a ratio of the first air space to a focal length f of the optical projection system is greater than or equal to 0.6 and less than or equal to 0.8.
A second air space is arranged between the second lens group and the third lens group, and the ratio of the second air space to the focal length f of the optical projection system is greater than or equal to 0.6 and less than or equal to 0.8;
and a third air interval is arranged between the third lens group and the fourth lens group, and the ratio of the third air interval to the focal length f of the optical projection system is greater than or equal to 3 and less than or equal to 3.5.
According to a second aspect of the application, an electronic device is provided, comprising an optical projection system as described in the first aspect.
In the optical projection system provided by the embodiment of the application, through the optimal configuration of each parameter, the image effects of small distortion of a projected image, high relative illumination and high MTF (modulation transfer function) can be achieved.
Further features of the present application and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.
FIG. 1 is a schematic diagram of an optical structure of an optical projection system according to the present application;
FIG. 2 is a schematic optical path diagram of an optical projection system according to the present application;
FIG. 3 is a schematic view of curvature of field and distortion of an optical projection system according to the present application;
FIG. 4 is a schematic diagram illustrating relative illumination of an optical projection system according to the present application;
FIG. 5 is a schematic diagram of a modulation transfer function of an optical projection system according to the present application.
Description of reference numerals:
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 prism; 10. display chip protective glass; 11. a display chip; 12. and (4) a diaphragm.
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, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Referring to fig. 1-2, according to one embodiment of the present application, there is provided an optical projection system including, in order from an enlargement side to a reduction side:
a first lens group, a second lens group, a third lens group and a fourth lens group;
the focal power of the first lens group is negative, the focal power of the second lens group is negative, the focal power of the third lens group is positive, and the focal power of the fourth lens group is positive;
the ratio of the total optical length of the optical projection system to the focal length f of the optical projection system is greater than or equal to 9.5 and less than or equal to 11.
The optical projection system provided by the embodiment of the application further comprises a prism 9, display chip protective glass 10 and a display chip 11; more specifically, the prism 9 is an equivalent turning prism, and the prism 9 is used for transmitting the light emitted by the display chip 11 or the reflected light to the lens; the display chip protection glass 10 is used for protecting the display chip 11 from external pollutants; the display chip 11 may be a digital micromirror device display panel (DMD), a Liquid Crystal On Silicon (LCOS) display panel, a liquid crystal display panel (LCD), or the like. It is understood that the display chip 11 is a laser light source with different wavelengths or other light source bodies capable of emitting light beams.
The optical projection system provided by the embodiment of the application is applied to a projection device; the optical projection system comprises a reduction side and an enlargement side along the light transmission direction, and a display chip 11, display chip protective glass 10, a prism 9, a fourth lens group, a third lens group, a second lens group and a first lens group in the optical projection system are sequentially arranged between the reduction side and the enlargement side along the same optical axis. Wherein, the reduction side is the side where the image source (for example, the display chip 11) generating the projection light is located in the projection process, namely the image side; the enlargement side is the side on which a projection surface (such as a projection screen) for displaying a projection image is located during projection, i.e., the object side. The transmission direction of the projection light is from the reduction side to the enlargement side. However, in designing an optical projection system in practice, light rays are simulated from the actual enlargement side to the reduction side based on the principle that the light path is reversible.
Specifically, in an actual projection process, projection light is emitted from the display chip 11, emitted from the reduction side toward the enlargement side, and passes through the display chip protective glass 10, the prism 9, the fourth lens group, the third lens group, the second lens group, and the first lens group in this order, thereby displaying a projection image.
In the embodiment of the present application, the display chip 11 as an image source may be a Digital Micromirror Device (DMD) chip. The DMD is composed of many digital micromirrors arranged in a matrix, each micromirror can deflect and lock in both forward and reverse directions during operation, so that light is projected in a predetermined direction and swings at a frequency of tens of thousands of hertz, and light beams from an illumination light source enter an optical system through the inverted reflection of the micromirrors to be imaged on a screen. The DMD has the advantages of high resolution, no need of digital-to-analog conversion for signals and the like. This example uses a 0.3 inch DMD with a half-image height of 4.0mm, CRA < 0.9. Of course, the Display chip 11 as the image source may also be a Liquid Crystal On Silicon (LCOS) chip, a Liquid Crystal Display panel (LCD), or other Display elements capable of emitting light, which is not limited in this application.
In this embodiment, the power of the first lens group is negative, the power of the second lens group is negative, the power of the third lens group is positive, and the power of the fourth lens group is positive; through reasonable collocation of focal power of each lens group, the focal power balance of the whole optical projection system is ensured, and the requirement of 3D printing on image values is met. The first lens group, the second lens group and the third lens group are matched in negative-positive mode, so that the requirement of 3D printing on low distortion is met, and the fourth lens group is a positive lens group formed by combining a plurality of lenses, so that the requirement of 3D printing on high resolution of images is met (the actual performance is that MTF is more than 0.7). In addition, by setting the ratio of the total optical length of the optical projection system to the focal length f of the optical projection system to be greater than or equal to 9.5 and less than or equal to 11, the structure of the optical projection system can be made compact while ensuring the quality of an imaging picture, so that the volume size of the optical projection system is ensured to be small to a certain extent, and the optical projection system is convenient to carry and use. That is, in the optical projection system provided in the embodiments of the present application, the ratio of the total optical length of the optical projection system to the focal length f is limited to the above range, and the imaging effect of the optical projection system is improved under the condition of reducing the volume of the optical projection system. The optical projection system provided by the embodiment of the application has the advantages of small distortion of a projected image, high relative illumination and high MTF modulation function.
Referring to fig. 1-2, in one embodiment, the first lens group includes a first lens 1 and a second lens 2 disposed in order from a magnification side to a reduction side, the magnification side of the first lens 1 is convex, and the reduction side is concave; the magnifying side surface of the second lens element 2 is a convex surface, and the reducing side surface is a concave surface.
The second lens group comprises a third lens 3, and the magnifying side surface of the third lens 3 is a convex surface, and the reducing side surface of the third lens is a concave surface.
The third lens group comprises a fourth lens 4, and the magnifying side surface of the fourth lens 4 is a plane, and the reducing side surface of the fourth lens is a convex surface.
The fourth lens group includes a fifth lens 5, a sixth lens 6, a seventh lens 7, and an eighth lens 8, which are arranged in this order from the magnification side to the reduction side;
the magnifying side surface of the fifth lens 5 is a concave surface, and the reducing side surface is a plane;
the magnifying side surface of the sixth lens element 6 is a concave surface, and the reducing side surface is a convex surface;
the magnifying side surface and the reducing side surface of the seventh lens 7 are convex surfaces;
the magnifying side surface of the eighth lens element 8 is a convex surface, and the reducing side surface is a plane surface.
In this specific example, the first lens 1 is a convex-concave lens, the second lens 2 is also a convex-concave lens, and the third lens 3 is also a convex-concave lens. The first lens 1, the second lens 2, and the third lens 3 each exhibit a shape similar to a crescent shape. The fourth lens element 4 is a plano-convex lens element, the fifth lens element 5 is a plano-concave lens element, the sixth lens element 6 is a convex-concave lens element, the seventh lens element 7 is a biconvex lens element, and the eighth lens element 8 is a plano-convex lens element. By the above structural design of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7 and the eighth lens 8, the whole optical projection system meets the image value requirement and the light convergence capability of 3D printing.
In one embodiment, further, a ratio of a focal length f1 of the first lens group to a focal length f of the optical projection system is greater than or equal to 4.5 and less than or equal to 5; the ratio of the diameter of the first lens 1 in the first lens group to the focal length f of the optical projection system is greater than or equal to 2.6 and less than or equal to 3.5.
In one embodiment, further, a ratio of a focal length f2 of the second lens group to a focal length f of the optical projection system is greater than or equal to 7 and less than or equal to 9; the ratio of the lens diameter of the third lens 3 to the focal length f of the optical projection system is greater than or equal to 2 and less than or equal to 2.8.
In one embodiment, further, a ratio of a focal length f3 of the third lens group to a focal length f of the optical projection system is greater than or equal to 4 and less than or equal to 5; the ratio of the lens diameter of the fourth lens 4 to the focal length f of the optical projection system is greater than or equal to 2 and less than or equal to 2.5.
In one embodiment, further, a ratio of a focal length f4 of the fourth lens group to a focal length f of the optical projection system is greater than or equal to 1.2 and less than or equal to 1.8; the ratio of the lens diameter of the eighth lens 8 in the fourth lens group to the focal length f of the optical projection system is greater than or equal to 0.7 and less than or equal to 1.8.
In this specific example, by defining the ratios of the focal length f1 of the first lens group, the focal length f2 of the second lens group, the focal length f3 of the third lens group, the focal length f4 of the fourth lens group to the focal length f of the optical projection system, respectively; and defining the ratio of the lens diameter of the first lens group, the lens diameter of the second lens group, the lens diameter of the third lens group and the lens diameter of the fourth lens group to the focal length f of the optical projection system; the radial size of the optical projection system can be effectively reduced while the imaging quality is met, and the optical projection system is favorable for light, thin and small design.
In an embodiment, further, the abbe number of the eighth lens 8 is less than 55.
In this specific example, since the eighth lens 8 is closest to the light source (i.e., the display chip 11), the eighth lens 8 is made of a glass material with an abbe number less than 55 and good thermal stability, so that the requirements that the lens is not deformed and the image value is not shifted when the 3D printing system is continuously operated at a high temperature can be satisfied.
In addition, 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 are made of glass, and therefore the influence of thermal drift of the lens on the precision of 3D printing can be effectively reduced. And the purple light with shorter wavelength can be transmitted, the wavelength range of the purple light is 360-420 nm, and the dominant wavelength is 405 nm.
In one embodiment, the first lens group and the second lens group have a first air space therebetween, and a ratio of the first air space to a focal length f of the optical projection system is greater than or equal to 0.6 and less than or equal to 0.8.
A second air space is arranged between the second lens group and the third lens group, and the ratio of the second air space to the focal length f of the optical projection system is greater than or equal to 0.6 and less than or equal to 0.8;
and a third air interval is arranged between the third lens group and the fourth lens group, and the ratio of the third air interval to the focal length f of the optical projection system is greater than or equal to 3 and less than or equal to 3.5.
In this specific example, by optimally configuring the ratio of each air space to the focal length f of the optical projection system, the image quality can be effectively improved, and the total length of the optical lens assembly can be reduced, thereby achieving the purposes of light weight, thinness, and miniaturization. Therefore, the optical imaging lens group can meet the requirement of large-field-angle imaging, and simultaneously can effectively reduce the total length of the lens group, thereby achieving the purposes of lightness, thinness and miniaturization.
Referring to fig. 1-2, in one embodiment, a stop 12 is disposed between the third lens group and the fourth lens group;
a fourth air interval is arranged between the third lens group and the diaphragm 12, and the fourth air interval is 23-25 mm;
and a fifth air interval is arranged between the diaphragm 12 and the fourth lens group, and the fifth air interval is 5.1-5.6 mm.
In this specific example, the length of the fourth air gap between the stop 12 and the third lens group and the length of the fifth air gap between the stop 12 and the fourth lens group are limited, so that the image quality can be effectively improved and the optical total length of the optical projection system can be reduced, thereby meeting the design requirements of high image quality, light weight, thinness and miniaturization. Therefore, the optical projection system in the embodiment of the application can effectively reduce the total length of the optical projection system while meeting the imaging quality, so that the structure of the optical projection system is more compact, and the design purposes of light weight, thinness and miniaturization are achieved.
The optical projection system provided by the embodiment of the application has the advantages that the distortion of a projected image is small, the relative illumination is high, and the MTF modulation function is high; through the optimized configuration of the parameters, the distortion of the projected image is less than 0.3%, the relative illumination is more than 90%, and the MTF modulation function is more than 0.63, so that the consistency of 3D printing parts, high printing precision and no deformation are ensured.
According to another embodiment of the present application, there is provided an electronic device including the optical projection system as described above. The electronic device may be, for example, a projection device. The projection device may be, for example, a projector, an illumination light engine, or the like.
Example 1:
referring to fig. 1, the optical projection system includes, in order 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 diaphragm 12, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a prism 9, a display chip cover glass 10, and a display chip 11.
Wherein, the surface of the first lens 1 close to the magnifying side is a convex surface, the curvature radius is 38.1mm, and the thickness is 1.9 mm; the surface close to the reduction side is a concave surface, the curvature radius of the concave surface is 23mm, and the thickness of the concave surface is 2.0 mm; the refractive index of the first lens 1 was 1.79, and the abbe number was 47.5.
The surface of the second lens 2 close to the magnifying side is a convex surface, the curvature radius of the convex surface is 59.4mm, and the thickness of the convex surface is 1.7 mm; the surface close to the reduction side is a concave surface, the curvature radius of the concave surface is 32.2mm, and the thickness of the concave surface is 6.6 mm; the refractive index of the second lens 2 was 1.60, and the abbe number was 60.6.
The surface of the third lens 3 close to the magnifying side is a convex surface, the curvature radius of the convex surface is 109.2mm, and the thickness of the convex surface is 3.5 mm; the surface close to the reduction side is a concave surface, the curvature radius of the concave surface is 37mm, and the thickness of the concave surface is 6.4 mm; the refractive index of the third lens 3 was 1.79, and the abbe number was 47.5.
The surface of the fourth lens 4 close to the magnifying side is a plane, the curvature radius of the plane is 605.3mm, and the thickness of the plane is 3.5 mm; the surface close to the reduction side is a convex surface, the curvature radius of the convex surface is-30.1 mm, and the thickness of the convex surface is 24 mm; the refractive index of the fourth lens 4 is 1.72, and the abbe number is 29.5.
The surface of the fifth lens 5 close to the magnifying side is a concave surface, the curvature radius of the fifth lens is-6.8 mm, and the thickness of the fifth lens is 1.3 mm; the surface close to the reduction side is a plane, the curvature radius of the plane is 250.3mm, and the thickness of the plane is 0.7 mm; the refractive index of the fifth lens 5 is 1.73, and the abbe number is 28.3.
The surface of the sixth lens 6 close to the magnifying side is a concave surface, the curvature radius of the concave surface is-25.6 mm, and the thickness of the concave surface is 2.1 mm; the surface close to the reduction side is a convex surface, the curvature radius of the convex surface is-10.7 mm, and the thickness of the convex surface is 0.1 mm; the refractive index of the sixth lens 6 is 1.72, and the abbe number is 47.9.
The surface of the seventh lens element 7 close to the magnified side is a convex surface with a radius of curvature of 112.4mm and a thickness of 3.201 mm; the surface close to the reduction side is a convex surface, the curvature radius of the convex surface is-14.5 mm, and the thickness of the convex surface is 0.1 mm; the refractive index of the seventh lens 7 is 1.73, and the abbe number is 51.5.
The surface of the eighth lens element 8 on the magnified side is convex, and has a radius of curvature of 31.8mm and a thickness of 2.05 mm; the surface close to the reduction side is a plane, the curvature radius of the plane is-223.3 mm, and the thickness of the plane is 7.5 mm; the refractive index of the eighth lens 8 is 1.75, and the abbe number is 52.3.
The various parameters involved in example 1 are shown in table 1 below:
TABLE 1
Example 2:
referring to fig. 1, the optical projection system includes, in order 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 diaphragm 12, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a prism 9, a display chip cover glass 10, and a display chip 11.
Wherein, the surface of the first lens 1 close to the magnifying side is a convex surface, the curvature radius is 32mm, and the thickness is 1.8 mm; the surface close to the reduction side is a concave surface, the curvature radius of the concave surface is 20mm, and the thickness of the concave surface is 2.2 mm; the refractive index of the first lens 1 was 1.79, and the abbe number was 47.5.
The surface of the second lens 2 close to the magnifying side is a convex surface, the curvature radius of the convex surface is 65mm, and the thickness of the convex surface is 2.2 mm; the surface close to the reduction side is a concave surface, the curvature radius of the concave surface is 35mm, and the thickness of the concave surface is 6.8 mm; the refractive index of the second lens 2 was 1.60, and the abbe number was 60.6.
The surface of the third lens 3 close to the magnifying side is a convex surface, the curvature radius of the convex surface is 90mm, and the thickness of the convex surface is 3.4 mm; the surface close to the reduction side is a concave surface, the curvature radius of the concave surface is 42mm, and the thickness of the concave surface is 7.0 mm; the refractive index of the third lens 3 was 1.79, and the abbe number was 47.5.
The surface of the fourth lens 4 close to the magnifying side is a plane, the curvature radius of the plane is 650mm, and the thickness of the plane is 3.2 mm; the surface close to the reduction side is a convex surface, the curvature radius of the convex surface is-28 mm, and the thickness of the convex surface is 23 mm; the refractive index of the fourth lens 4 is 1.72, and the abbe number is 29.5.
The surface of the fifth lens 5 close to the magnifying side is a concave surface, the curvature radius of the fifth lens is minus 6.5mm, and the thickness of the fifth lens is 1.5 mm; the surface close to the reduction side is a plane, the curvature radius of the plane is 260.5mm, and the thickness of the plane is 0.5 mm; the refractive index of the fifth lens 5 is 1.73, and the abbe number is 28.3.
The surface of the sixth lens 6 close to the magnifying side is a concave surface, the curvature radius of the concave surface is-30.6 mm, and the thickness of the concave surface is 2.0 mm; the surface close to the reduction side is a convex surface, the curvature radius of the convex surface is-11.0 mm, and the thickness of the convex surface is 0.1 mm; the refractive index of the sixth lens 6 is 1.72, and the abbe number is 47.9.
The surface of the seventh lens element 7 close to the magnified side is a convex surface with a radius of curvature of 120.5mm and a thickness of 3.3 mm; the surface close to the reduction side is a convex surface, the curvature radius of the convex surface is-15.0 mm, and the thickness of the convex surface is 0.1 mm; the refractive index of the seventh lens 7 is 1.73, and the abbe number is 51.5.
The surface of the eighth lens element 8 on the magnified side is convex, and has a radius of curvature of 32.5mm and a thickness of 2.2 mm; the surface close to the reduction side is a plane, the curvature radius of the plane is-233.3 mm, and the thickness of the plane is 7.0 mm; the refractive index of the eighth lens 8 is 1.75, and the abbe number is 52.3.
The various parameters involved in example 2 are shown in table 2 below:
TABLE 2
Example 3:
referring to fig. 1, the optical projection system includes, in order from the enlargement side to the reduction side, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, an aperture 12, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a prism 9, a display chip cover glass 10, and a display chip 11.
Wherein, the surface of the first lens 1 close to the magnifying side is a convex surface, the curvature radius is 42mm, and the thickness is 2.0 mm; the surface close to the reduction side is a concave surface, the curvature radius of the concave surface is 26mm, and the thickness of the concave surface is 2.5 mm; the refractive index of the first lens 1 was 1.79, and the abbe number was 47.5.
The surface of the second lens 2 close to the magnifying side is a convex surface, the curvature radius of the convex surface is 50mm, and the thickness of the convex surface is 2.0 mm; the surface close to the reduced side is a concave surface, the curvature radius of the concave surface is 25mm, and the thickness of the concave surface is 6.3 mm-6.8 mm; the refractive index of the second lens 2 was 1.60, and the abbe number was 60.6.
The surface of the third lens 3 close to the magnifying side is a convex surface, the curvature radius of the convex surface is 120mm, and the thickness of the convex surface is 4.0 mm; the surface close to the reduction side is a concave surface, the curvature radius of the concave surface is 32mm, and the thickness of the concave surface is 6.0 mm-7.0 mm; the refractive index of the third lens 3 was 1.79, and the abbe number was 47.5.
The surface of the fourth lens element 4 close to the magnified side is a plane, the radius of curvature of the plane is 720mm, and the thickness of the plane is 4.0 mm; the surface close to the reduction side is a convex surface, the curvature radius of the convex surface is-29.1 mm, and the thickness of the convex surface is 25 mm; the refractive index of the fourth lens 4 is 1.72, and the abbe number is 29.5.
The surface of the fifth lens 5 close to the magnifying side is a concave surface, the curvature radius of the fifth lens is-7.5 mm, and the thickness of the fifth lens is 1.6 mm; the surface close to the reduction side is a plane, the curvature radius of the plane is 270mm, and the thickness of the plane is 0.8 mm; the refractive index of the fifth lens 5 was 1.73, and the abbe number was 28.3.
The surface of the sixth lens 6 close to the magnifying side is a concave surface, the curvature radius of the concave surface is-32.5 mm, and the thickness of the concave surface is 2.3 mm; the surface close to the reduction side is a convex surface, the curvature radius of the convex surface is-11.2 mm, and the thickness of the convex surface is 0.1 mm; the refractive index of the sixth lens 6 is 1.72, and the abbe number is 47.9.
The surface of the seventh lens element 7 close to the magnified side is a convex surface with a radius of curvature of 125mm and a thickness of 3.0 mm; the surface close to the reduction side is a convex surface, the curvature radius of the convex surface is-15.5 mm, and the thickness of the convex surface is 0.1 mm; the refractive index of the seventh lens 7 is 1.73, and the abbe number is 51.5.
The surface of the eighth lens element 8 near the magnification side is a convex surface, the curvature radius thereof is 33.8mm, and the thickness thereof is 2.3 mm; the surface close to the reduction side is a plane, the curvature radius of the plane is-246 mm, and the thickness of the plane is 8.0 mm; the refractive index of the eighth lens 8 is 1.75, and the abbe number is 52.3.
The various parameters involved in example 3 are shown in table 3 below:
TABLE 3
Referring to fig. 3, the meridional field curvature and the sagittal field curvature of the optical projection systems in embodiments 1 to 3 are both ± 0.03mm in the entire field of view, and the optical distortion of the maximum field of view is in the range of 0.3%, which can meet the lens distortion requirement required by 3D printing.
Referring to fig. 4, the relative illumination of the optical projection systems in examples 1 to 3 reaches 100%, and the requirement that the 3D printing brightness uniformity is greater than 90% is satisfied.
Referring to fig. 5, the modulation transfer function of the optical projection system in embodiments 1 to 3 is greater than 0.63 in each field of view, which satisfies the requirement of 3D printing accuracy.
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 illustrative purposes 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 (10)
1. An optical projection system comprising, in order from an enlargement side to a reduction side:
a first lens group, a second lens group, a third lens group and a fourth lens group;
the focal power of the first lens group is negative, the focal power of the second lens group is negative, the focal power of the third lens group is positive, and the focal power of the fourth lens group is positive;
the ratio of the total optical length of the optical projection system to the focal length f of the optical projection system is greater than or equal to 9.5 and less than or equal to 11.
2. The optical projection system of claim 1, wherein a ratio of a focal length f1 of the first lens group to a focal length f of the optical projection system is greater than or equal to 4.5 and less than or equal to 5.
3. The optical projection system according to claim 2, wherein the first lens group includes a first lens (1) and a second lens (2) which are arranged in order from the magnification side to the reduction side.
4. The optical projection system of claim 1, wherein a ratio of a focal length f2 of the second lens group to a focal length f of the optical projection system is greater than or equal to 7 and less than or equal to 9.
5. The optical projection system of claim 1, wherein a ratio of a focal length f3 of the third lens group to a focal length f of the optical projection system is greater than or equal to 4 and less than or equal to 5.
6. The optical projection system of claim 1, wherein a ratio of a focal length f4 of the fourth lens group to a focal length f of the optical projection system is greater than or equal to 1.2 and less than or equal to 1.8.
7. The optical projection system according to claim 1, wherein the fourth lens group includes a fifth lens (5), a sixth lens (6), a seventh lens (7), and an eighth lens (8) which are arranged in this order from the magnification side to the reduction side.
8. The optical projection system according to claim 7, characterized in that the abbe number of the eighth lens (8) is smaller than 55.
9. The optical projection system of claim 1, wherein a first air space is provided between the first lens group and the second lens group, and a ratio of the first air space to a focal length f of the optical projection system is greater than or equal to 0.6 and less than or equal to 0.8;
a second air space is arranged between the second lens group and the third lens group, and the ratio of the second air space to the focal length f of the optical projection system is greater than or equal to 0.6 and less than or equal to 0.8;
and a third air interval is arranged between the third lens group and the fourth lens group, and the ratio of the third air interval to the focal length f of the optical projection system is greater than or equal to 3 and less than or equal to 3.5.
10. An electronic device characterized in that it comprises an optical projection system according to any one of claims 1-9.
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| CN114594574A (en) * | 2022-03-31 | 2022-06-07 | 歌尔光学科技有限公司 | Optical projection system and electronic equipment |
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| CN114942561B (en) | 2022-11-22 |
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