CN214751069U - Projection lens and projection equipment - Google Patents
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- CN214751069U CN214751069U CN202121395206.0U CN202121395206U CN214751069U CN 214751069 U CN214751069 U CN 214751069U CN 202121395206 U CN202121395206 U CN 202121395206U CN 214751069 U CN214751069 U CN 214751069U
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Abstract
The utility model discloses a projection lens and projection equipment, wherein, projection lens is by object space to image space along same optical axis, include: a first lens, a second lens, a cemented lens, and a fifth lens; the first lens has a negative optical power; the second lens has positive optical power; the cemented lens comprises a third lens and a fourth lens, the third lens is positioned between the second lens and the fourth lens, and opposite surfaces of the third lens and the fourth lens are cemented with each other, the third lens has a negative power, and the fourth lens has a positive power; the fifth lens has a positive optical power. The utility model discloses technical scheme can satisfy projection lens's small-size modular requirement to effectively eliminate the aberration that produces in the optical imaging, guarantee the imaging quality.
Description
Technical Field
The utility model relates to a projection imaging technology field, in particular to projection lens and projection equipment.
Background
In recent years, with the development and depth of semiconductor technology, digital projection display technology has been advanced, and projection apparatuses have been widely used in various fields such as industry, business, education, and home. Among them, Digital Light Processing (DLP) projection apparatuses have become one of the mainstream projection apparatuses due to their high definition pictures, high brightness images, rich colors, and high contrast displays. The core component in the DLP technology mainly uses a Digital Micromirror Device (DMD) chip.
With the updating of optical technology and market demands, the micro projection system puts a strict demand on miniaturization, and the projection lens is required to be small in size and compact in structure, so that the application demands of different customers are met through small modularization. However, when designing a projection lens, in order to obtain higher optical performance, a larger number of lenses are generally required for assembly, which results in a larger size of the projection lens; or, although the requirement of small size is satisfied, partial performance of the lens is weakened, and the optical imaging quality is affected.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a projecting lens and projection equipment, aim at satisfying projecting lens's small-size modular's requirement to can effectively eliminate the aberration that produces among the optical imaging, guarantee the imaging quality.
In order to achieve the above object, the utility model provides a projection lens, by object space to image space along same optical axis, include: a first lens having a negative optical power; a second lens having a positive optical power; a cemented lens including a third lens and a fourth lens, the third lens being positioned between the second lens and the fourth lens, and opposite surfaces of the third lens and the fourth lens being cemented to each other, the third lens having a negative power, the fourth lens having a positive power; and a fifth lens having a positive optical power.
Optionally, a surface of the first lens facing the object side is a convex surface, and a surface of the first lens facing the image side is a concave surface; the surface of the second lens facing the object side is a convex surface, and the surface of the second lens facing the image side is a plane; the surface of the third lens facing the object side is a concave surface, and the surface of the third lens facing the image side is a concave surface; the surface of the fourth lens, which faces the object side, is convex, and the surface of the fourth lens, which faces the image side, is convex; the surface of the fifth lens facing the object side is a convex surface, and the surface of the fifth lens facing the image side is a convex surface.
Optionally, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the cemented lens is f3/4, and the focal length of the fifth lens is f5, wherein-14.5 < f1< -9.5, 13.5< f2<22.5, -52.5< f3/4<34.5, and 7.5< f5< 12.5; and/or the focal length of the projection lens is f, wherein 5.1< f < 6.7.
Optionally, the first lens is made of an optical plastic material; and/or the second lens, the third lens, the fourth lens and the fifth lens are all made of glass materials.
Optionally, a surface of the first lens facing the object side and a surface of the first lens facing the image side are both aspheric surfaces; and/or the surface of the fifth lens facing to the object side and the surface of the fifth lens facing to the image side are both aspheric surfaces.
Optionally, the projection lens further includes: and the diaphragm is arranged between the second lens and the third lens.
Optionally, the projection lens further includes: and the display unit is arranged on one side of the fifth lens facing the image space.
Optionally, the projection lens further includes: a prism disposed between the display unit and the fifth lens.
Optionally, the projection lens further includes: and the transparent protective layer is arranged on one side of the display unit facing the object space.
In order to achieve the above object, the present invention provides a projection apparatus, including the projection lens and the housing as described in any of the above embodiments, the projection lens is disposed on the housing.
The technical scheme of the utility model, projection lens includes the first lens that distributes along same optical axis by the object space to the image space, the second lens, cemented lens and fifth lens, first lens has negative focal power, the second lens has positive focal power, the two cooperation can effectively reduce the field curvature and the distortion that produce in the optical imaging process, cemented lens includes third lens and fourth lens, the third lens has negative focal power, the fourth lens has positive focal power, through the two cemented lens of third lens and fourth lens veneer component, can effectively eliminate the chromatic aberration that produces in the optical imaging process, thereby guarantee imaging quality, make projection lens's distortion become, chromatic aberration is little, optical performance is good; and, the utility model discloses only form projection lens through five lens combinations, the lens is small in quantity, and compact structure can satisfy projection lens's small-size modular's requirement.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of a projection lens according to the present invention;
fig. 2 is a schematic light path diagram of an embodiment of the projection lens of the present invention;
fig. 3 is a structural parameter diagram of an embodiment of a projection lens according to the present invention;
fig. 4 is a diagram of a modulation transfer function according to an embodiment of the projection lens of the present invention;
fig. 5 is a light ray dot array diagram according to an embodiment of the projection lens of the present invention;
fig. 6 is a diagram of field curvature and optical distortion according to an embodiment of the projection lens of the present invention;
fig. 7 is a vertical axis chromatic aberration diagram according to an embodiment of the projection lens of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | |
50 | |
| 10 | |
60 | |
| 20 | |
70 | |
| 30 | |
80 | Prism |
| 40 | |
90 | Transparent protective layer |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a projection lens 100.
In the embodiment of the present invention, as shown in fig. 1 to 2, the projection lens 100, from the object space to the image space along the same optical axis, includes: a first lens 10, a second lens 20, a cemented lens, and a fifth lens 50; the first lens 10 has a negative power; the second lens 20 has positive optical power; the cemented lens includes a third lens 30 and a fourth lens 40, the third lens 30 is located between the second lens 20 and the fourth lens 40, and opposite surfaces of the third lens 30 and the fourth lens 40 are cemented with each other, the third lens 30 has a negative power, and the fourth lens 40 has a positive power; the fifth lens 50 has a positive optical power.
Specifically, the utility model discloses a when projection lens 100 is applied to projection equipment, still be equipped with display element 70 in one side of fifth lens 50 towards the image space, the projection light signal is sent by display element 70, from the image space towards the object space transmission, passes through fifth lens 50 in proper order, glues synthetic integrative fourth lens 40 and third lens 30, second lens 20 and first lens 10, finally exports to being located first lens 10 towards the plane of projection of object space one side to show the image. The image space is a side (as shown in B) where an image source (display unit 70) of the projection image is located during the projection process, and the object space is a side (as shown in a) where the projection image is imaged on a projection surface (such as a wall surface).
In the optical system, the result of non-paraxial ray tracing and the result of paraxial ray tracing do not coincide with each other, and a deviation from an ideal state of gaussian optics (first order approximation theory or paraxial ray) is called aberration. The aberration is mainly classified into distortion, curvature of field, chromatic aberration, spherical aberration, coma aberration, astigmatism, and the like. The aberration affects the imaging quality of the projection lens 100, and therefore, it is necessary to eliminate the aberration generated when the optical system images as much as possible when the projection lens 100 is designed.
It is understood that a negative power lens is a lens with a thin middle part and a thick periphery, which is also called a concave lens and has the function of diverging light; the positive focal power lens is a lens with thick middle part and thin periphery, which is also called a convex lens and has the function of converging light. Wherein, through the cooperation of the first lens 10 with negative focal power and the second lens 20 with positive focal power, the curvature of field and distortion generated in the optical imaging process can be effectively reduced. The third lens 30 is specifically a flint glass negative lens with a high refractive index, the fourth lens 40 is specifically a crown glass positive lens with a low refractive index, and the third lens 30 and the fourth lens 40 with different refractive indexes and dispersion are cemented to form a double cemented lens, so that chromatic aberration generated in the optical imaging process can be effectively eliminated.
Therefore, the technical scheme of the utility model, only form projection lens 100 through five lens combinations, the lens is small in quantity, and compact structure can satisfy projection lens 100's small-size modular requirement to, the cooperation through between the lens of isostructure is used, can effectively eliminate the aberration that produces in the optical imaging, thereby guarantees the imaging quality, makes projection lens 100's distortion little, the chromatic aberration is little, optical performance is good.
Specifically, referring to fig. 1 to 2, the surface of the first lens element 10 facing the object side is convex, and the surface facing the image side is concave; the surface of the second lens 20 facing the object side is convex, and the surface facing the image side is flat; the surface of the third lens element 30 facing the object side is concave, and the surface facing the image side is concave; the surface of the fourth lens element 40 facing the object side is convex, and the surface facing the image side is convex; the surface of the fifth lens element 50 facing the object side is convex, and the surface facing the image side is convex.
In the present embodiment, the first lens element 10 is a meniscus lens element, the first lens element 10 is curved toward the object, the second lens element 20 is a plano-convex lens element, the third lens element 30 is a biconcave lens element, the fourth lens element 40 is a biconvex lens element, and the fifth lens element 50 is a biconvex lens element, which is advantageous for enlarging the field angle of the projection lens 100 and achieving a large field angle effect, and the first lens element 10, the second lens element 20, the third lens element 30, the fourth lens element 40, and the fifth lens element 50 are compact in structure, which is advantageous for small-scale modularization of the projection lens 100.
As an alternative embodiment, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the cemented lens is f3/4, and the focal length of the fifth lens is f5, wherein-14.5 < f1< -9.5, 13.5< f2<22.5, -52.5< f3/4<34.5, and 7.5< f5< 12.5; the focal length of the projection lens is f, wherein 5.1< f < 6.7. Through the structure setting, can further optimize the utility model discloses a projection lens.
In an embodiment of the present invention, the first lens element 10 is made of an optical plastic material.
In this embodiment, the display unit 70 generates heat during operation, so that the plastic lens in the projection lens 100 is easily deformed due to the high temperature, the service life of the plastic lens is easily shortened, and the imaging quality of the projection lens 100 is also affected. Since the first lens 10 is farthest from the display unit 70 in the projection lens 100 and is least affected by high temperature, the first lens 10 can be made of optical plastic, and compared with optical glass, optical plastic has the advantages of strong plasticity, light weight and low processing cost.
In an embodiment of the present invention, the second lens element 20, the third lens element 30, the fourth lens element 40 and the fifth lens element 50 are made of glass.
Since the thermal distortion rate of the glass material is far lower than that of the plastic material at the same temperature, and the glass material has better stability, the second lens 20, the third lens 30, the fourth lens 40 and the fifth lens 50 close to the display unit 70 can be set to be the glass material, so that the influence of high temperature on the projection lens 100 can be avoided to the maximum extent. Further, in order to reduce the manufacturing cost, the second lens 20, the third lens 30, the fourth lens 40, and the fifth lens 50 may be made of a common mold glass with a low price.
In an embodiment of the present invention, the surface of the first lens element 10 facing the object side and the surface facing the image side are aspheric. The surface of the fifth lens element 50 facing the object side and the surface facing the image side are both aspheric.
In this embodiment, the surfaces of the two sides of the first lens element 10 are both set to be aspheric surfaces, and the curvatures of the central position and the curvatures of the edge position are different, so that the imaging result of the position close to the optical axis and the imaging result of the position far away from the optical axis can be adjusted, the imaging difference of the position close to the optical axis and the imaging difference of the position far away from the optical axis are reduced, the imaging is further reduced, the imaging is clearer, the aberration correction effect is realized, and the miniaturization of the projection lens 100 is facilitated. Similarly, by providing the fifth lens element 50 whose two side surfaces are aspheric surfaces, spherical aberration, coma aberration and astigmatism generated during the optical imaging process can be effectively eliminated, and the effect of correcting aberration can be achieved.
In an embodiment of the present invention, referring to fig. 1 to 2, the projection lens 100 further includes: and an aperture 60, the aperture 60 being disposed between the second lens 20 and the third lens 30.
In this embodiment, the diaphragm 60 is specifically an aperture diaphragm 60, and the diaphragm 60 is used to limit the diameter of the passing projection light, adjust the luminous flux exiting from the optical system, and reduce the stray light interference generated by other lenses through reflection, so that the imaging of the projection light is clearer. The aperture of the diaphragm 60 is usually a fixed value, but of course, in order to flexibly adjust the image sharpness and enable the projection lens 100 to better adapt to the switching of the high and low resolutions, the diaphragm 60 may be set in such a manner that the aperture size can be adjusted.
In an embodiment of the present invention, referring to fig. 1 to 2, the projection lens 100 further includes: and a display unit 70, wherein the display unit 70 is arranged on one side of the fifth lens 50 facing the image side.
In this embodiment, the display unit 70 may be a Digital Micromirror Device (DMD) chip with a specific size of 0.2 inches. The DMD is composed of a plurality of digital micromirrors arranged in a matrix, and 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 the projection lens 100 through the inverted reflection of the micromirror 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. Of course, the display unit 70 may also be a Liquid Crystal On Silicon (LCOS) chip or other display elements capable of emitting light.
In an embodiment of the present invention, referring to fig. 1 to 2, the projection lens 100 further includes: and a prism 80, the prism 80 being disposed between the display unit 70 and the fifth lens 50.
In this embodiment, the prism 80 is specifically a right-angle prism 80, and the length of the right-angle side is 9.5 mm. Prism 80 may combine the three-color images emitted by display unit 70 into one image and transmit the corresponding projection light signal to projection lens 100 for subsequent display of the image.
In an embodiment of the present invention, referring to fig. 1 to 2, the projection lens 100 further includes: and the transparent protective layer 90 is arranged on one side of the display unit 70 facing the object side, and the transparent protective layer 90 is arranged on the other side of the display unit 70 facing the object side.
In this embodiment, the transparent protection layer 90 is specifically a cover glass, the thickness of the cover glass is 1.1 mm, and the cover glass covers the light emitting surface of the display unit 70, so that the display unit 70 can be effectively protected on the premise of ensuring good light transmittance, and external dust is prevented from entering the display unit 70.
To further optimize the performance of the projection lens 100, please refer to fig. 3, which illustrates the surface curvature radius and thickness of each lens, and the refractive index and abbe number of each lens. Wherein, the thickness of the interval position of the serial number is expressed as the distance between two adjacent lenses.
The projection ratio of the projection lens 100 is 1.2, and specifically, the projection ratio refers to the ratio of the projection distance to the projection screen width. The aperture ratio of the projection lens 100 is a large aperture F no1.7, which greatly satisfies the requirement of the projection lens 100 on brightness. Specifically, the aperture ratio refers to a ratio of a focal length to an aperture diameter, and when the aperture ratio is smaller, the relative aperture of the projection lens 100 is larger, and the amount of light passing is larger; when the aperture ratio is larger, the relative aperture of the projection lens 100 is smaller, and the amount of light transmitted is smaller. The projection lens 100 has an image-side telecentric optical path within 1 ° and a large field angle (the field angle is also called a field of view in optical engineering, the size of the field angle determines the field of view range of an optical instrument, and the field angle can be expressed by FOV), and the field angle satisfies the following conditions: 55 < FOV < 65. Projection lens 100 operates at 854 x 480 resolution.
Referring to fig. 4 based on the parameter data of fig. 3, fig. 4 is a Modulation Transfer Function (MTF) diagram of each view field chip surface of the projection lens 100, where the MTF diagram is used to refer to a relationship between a modulation degree and a logarithm of lines per millimeter in an image, and is used to evaluate detail reduction capability of a scene. The projection distance of the projection equipment is 1000mm, the projection screen is 38 inches, the projection angle is taken as a sampling interval frequency coordinate of a field of view, and the ordinate is a transfer function MTF value. As can be seen from FIG. 4, the MTF is greater than 0.5.
Referring to fig. 5 based on the parameter data of fig. 3, fig. 5 is a dot-sequence diagram of the projection lens 100; the point diagram refers to that after a plurality of light rays emitted by one point pass through the optical assembly, intersection points of the light rays and the image surface are not concentrated on the same point any more due to aberration, and a diffusion pattern scattered in a certain range is formed and used for evaluating the imaging quality of the projection optical system. The smaller the root mean square radius value and the geometric radius value, the better the imaging quality. As can be seen from fig. 5, the root mean square radius of all the field-of-view point lists is less than 5.4um for one pixel.
Referring to fig. 6 based on the parameter data of fig. 3, fig. 6 is a graph of curvature of field and distortion of the projection lens 100, wherein the curvature of field is curvature of field, which is mainly used to represent the misalignment between the intersection point of the whole light beam and the ideal image point in the optical assembly. The distortion refers to the aberration of different magnifications of different parts of an object when the object is imaged through an optical component, and the distortion can cause the similarity of the object image to be deteriorated without influencing the definition of the image. As can be seen from fig. 6, the distortion is less than 1%.
Referring to fig. 7 based on the parameter data of fig. 3, fig. 7 is a vertical axis chromatic aberration diagram of the projection lens 100, in which a vertical axis chromatic aberration is also called a magnification chromatic aberration, mainly refers to a polychromatic main light ray at an image side, and is changed into a plurality of light rays when the object side exits due to chromatic dispersion of the refractive system. As can be seen from FIG. 7, all fields of view are less than 2.5um (0.5pixel), preferably.
The utility model also provides a projection equipment, this projection equipment include casing and projection lens 100, and above-mentioned embodiment is referred to this projection lens 100's concrete structure, because this projection equipment has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is no longer given here. The projection lens 100 is disposed on the housing.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (11)
1. A projection lens, characterized in that, along the same optical axis from the object side to the image side, includes:
a first lens having a negative optical power;
a second lens having a positive optical power;
a cemented lens including a third lens and a fourth lens, the third lens being positioned between the second lens and the fourth lens, and opposite surfaces of the third lens and the fourth lens being cemented to each other, the cemented lens having a positive power; and
a fifth lens having a positive optical power.
2. The projection lens of claim 1, wherein the surface of the first lens facing the object side is convex and the surface facing the image side is concave;
the surface of the second lens facing the object side is a convex surface, and the surface of the second lens facing the image side is a plane;
the surface of the third lens facing the object side is a concave surface, and the surface of the third lens facing the image side is a concave surface;
the surface of the fourth lens, which faces the object side, is convex, and the surface of the fourth lens, which faces the image side, is convex;
the surface of the fifth lens facing the object side is a convex surface, and the surface of the fifth lens facing the image side is a convex surface.
3. The projection lens of claim 1 wherein the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the cemented lens is f3/4, and the focal length of the fifth lens is f5, wherein-14.5 < f1< -9.5, 13.5< f2<22.5, -52.5< f3/4<34.5, and 7.5< f5< 12.5.
4. The projection lens of claim 1 wherein the focal length of the projection lens is f, where 5.1< f < 6.7.
5. The projection lens of claim 1 wherein the first lens is an optical plastic material;
and/or the second lens, the third lens, the fourth lens and the fifth lens are all made of glass materials.
6. The projection lens of claim 1, wherein the surface of the first lens facing the object side and the surface facing the image side are both aspheric;
and/or the surface of the fifth lens facing to the object side and the surface of the fifth lens facing to the image side are both aspheric surfaces.
7. The projection lens of claim 1 wherein the projection lens further comprises:
and the diaphragm is arranged between the second lens and the third lens.
8. The projection lens of any of claims 1 to 7, further comprising:
and the display unit is arranged on one side of the fifth lens facing the image space.
9. The projection lens of claim 8 wherein the projection lens further comprises:
a prism disposed between the display unit and the fifth lens.
10. The projection lens of claim 8 wherein the projection lens further comprises:
and the transparent protective layer is arranged on one side of the display unit facing the object space.
11. A projection apparatus, comprising the projection lens according to any one of claims 1 to 10 and a housing, wherein the projection lens is disposed on the housing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121395206.0U CN214751069U (en) | 2021-06-22 | 2021-06-22 | Projection lens and projection equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121395206.0U CN214751069U (en) | 2021-06-22 | 2021-06-22 | Projection lens and projection equipment |
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| CN214751069U true CN214751069U (en) | 2021-11-16 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115047591A (en) * | 2022-05-30 | 2022-09-13 | 歌尔光学科技有限公司 | Projection lens and projection device |
| TWI836462B (en) * | 2022-06-07 | 2024-03-21 | 揚明光學股份有限公司 | Fixed-focus lens for vehicle projection |
-
2021
- 2021-06-22 CN CN202121395206.0U patent/CN214751069U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115047591A (en) * | 2022-05-30 | 2022-09-13 | 歌尔光学科技有限公司 | Projection lens and projection device |
| CN115047591B (en) * | 2022-05-30 | 2023-09-05 | 歌尔光学科技有限公司 | Projection lens and projection device |
| WO2023231111A1 (en) * | 2022-05-30 | 2023-12-07 | 歌尔光学科技有限公司 | Projection lens and projection device |
| TWI836462B (en) * | 2022-06-07 | 2024-03-21 | 揚明光學股份有限公司 | Fixed-focus lens for vehicle projection |
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Effective date of registration: 20221130 Address after: 261031 workshop 1, phase III, Geer Photoelectric Industrial Park, 3999 Huixian Road, Yongchun community, Qingchi street, high tech Zone, Weifang City, Shandong Province Patentee after: GoerTek Optical Technology Co.,Ltd. Address before: 261031 No. 268 Dongfang Road, hi tech Industrial Development Zone, Shandong, Weifang Patentee before: GOERTEK Inc. |