CN110174751B - Projection lens and projection display device - Google Patents
Projection lens and projection display device Download PDFInfo
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- CN110174751B CN110174751B CN201910499901.2A CN201910499901A CN110174751B CN 110174751 B CN110174751 B CN 110174751B CN 201910499901 A CN201910499901 A CN 201910499901A CN 110174751 B CN110174751 B CN 110174751B
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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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/0065—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having a beam-folding prism or mirror
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/22—Telecentric objectives or lens systems
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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
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Abstract
The invention discloses a projection lens and a projection display device, wherein the projection lens is used for receiving projection light emitted by a display unit, the projection light is emitted to a diaphragm through the projection lens, and the projection lens comprises: a first positive lens, a first negative lens, a second positive lens and a third positive lens for projection imaging are sequentially arranged along the direction from the diaphragm to the display unit; defining the field angle of the projection lens as FOV, wherein half of the field angle of the projection lens is HFOV, the total length from the light-emitting surface of the first positive lens of the projection lens to the display imaging surface of the display unit is the total length of the projection lens, when the total length of the projection lens is TTL, tan (HFOV)/TTL is more than 0.017, and when the telecentricity of the projection lens is Tele, Tele is less than 1 degree. The invention provides a projection lens which is convenient for miniaturizing a projection device.
Description
Technical Field
The invention relates to the technical field of projection products, in particular to a projection lens and projection display equipment.
Background
With the development of image technology, the demand of projection equipment is increasing, the current projection equipment has a large volume and is inconvenient to carry and use, and especially, a projection lens with a relatively complex light path design is generally designed and used with a plurality of groups of lenses, but the problem that the projection equipment is difficult to miniaturize is caused.
Disclosure of Invention
Accordingly, it is necessary to provide a projection lens and a projection display device, which can effectively solve the problem that the projection device is difficult to miniaturize.
In order to achieve the above object, the present invention provides a projection lens, which is configured to receive projection light emitted from a display unit, wherein the projection light is emitted to a diaphragm through the projection lens, and the projection lens includes:
a first positive lens, a first negative lens, a second positive lens and a third positive lens for projection imaging are sequentially arranged along the direction from the diaphragm to the display unit;
defining the field angle of the projection lens as FOV, wherein half of the field angle of the projection lens is HFOV, the total length from the light emitting surface of the first positive lens of the projection lens to the display imaging surface of the display unit is the total length of the projection lens, and the total length of the projection lens is TTL (transistor-transistor logic), then
tan(HFOV)/TTL>0.017
The telecentricity of the projection lens is Tele, then
Tele<1°。
Optionally, the refractive index of each of the first positive lens, the first negative lens, the second positive lens and the third positive lens ranges from 1.45 to 1.75, and the abbe number ranges from 50 to 70.
Optionally, an effective focal length of the projection lens is defined as f, and an effective focal length of the first positive lens is defined as f1The effective focal length of the first negative lens is f2Effective focal length f of the second positive lens3The effective focal length of the third positive lens is f4Then, then
1<f/f1<1.5，-3.7<f/f2<-2，0.5<f/f3<1.5，0.5<f/f4<1.3。
Optionally, the light emitting surface of the first positive lens at least has a first inflection point, the first inflection point is disposed at the edge of the first positive lens, the light incident surface of the first positive lens faces the incident direction of the projection light and is convex, the first negative lens is a concave-convex lens, the light emitting surface of the first negative lens faces the emergent direction of the projection light and is concave, the light incident surface of the first negative lens faces the incident direction of the projection light and is convex, the second positive lens is a concave-convex lens, the light emitting surface of the second positive lens faces the emergent direction of the projection light and is concave, the light incident surface of the second positive lens faces the incident direction of the projection light and is convex, the thickness of the second positive lens is between 1.5mm and 1.7mm, the light incident surface of the third positive lens at least has a second inflection point, and the second inflection point is disposed at the edge of the third positive lens, and the central area of the light-emitting surface of the third positive lens is convex towards the emergent direction of the projection light, and the central area of the light-entering surface of the third positive lens is concave towards the incident direction of the projection light.
Optionally, the first positive lens is a biconvex lens, the light emitting surface of the first negative lens is concave towards the emitting direction of the projection light, the light incident surface of the first negative lens is convex towards the incident direction of the projection light, the second positive lens is a concave-convex lens, the light emergent surface of the second positive lens is concave towards the emergent direction of the projection light, the light incident surface of the second positive lens is convex towards the incident direction of the projection light, the thickness of the second positive lens is between 0.8mm and 0.9mm, the light incident surface of the third positive lens is at least provided with a third inflection point, the third inflection point is arranged at the edge of the third positive lens, and the central area of the light-emitting surface of the third positive lens is convex towards the emergent direction of the projection light, the central area of the light incident surface of the third positive lens is concave towards the incident direction of the projection light.
Optionally, the first positive lens is a biconvex lens, the light emitting surface of the first negative lens is concave towards the emitting direction of the projection light, the light incident surface of the first negative lens is convex towards the incident direction of the projection light, the second positive lens is a concave-convex lens, the light emergent surface of the second positive lens is concave towards the emergent direction of the projection light, the light incident surface of the second positive lens is convex towards the incident direction of the projection light, the thickness of the second positive lens is 1.3mm-1.4mm, the light incident surface of the third positive lens is at least provided with a fourth inflection point, the fourth inflection point is arranged at the edge of the third positive lens, and the central area of the light-emitting surface of the third positive lens is convex towards the emergent direction of the projection light, the central area of the light incident surface of the third positive lens is concave towards the incident direction of the projection light.
Optionally, a turning prism for turning the light path is disposed in a light path between the third positive lens and the display unit, and the display unit is provided with a protective glass facing the incident direction of the projection light.
Optionally, the total length of the projection lens is TTL smaller than 21.4mm, and the height of the projection lens in the vertical direction is DIA, which is smaller than 10 mm.
Optionally, a distance between a light-emitting surface of a first positive lens of the projection lens and the diaphragm is 5mm, and the first positive lens, the first negative lens, the second positive lens and the third positive lens are all made of plastic materials.
Further, to achieve the above object, the present invention also provides a projection display apparatus comprising: a housing and a projection lens as described above, the projection lens being disposed within the housing.
According to the technical scheme provided by the invention, the first positive lens, the first negative lens, the second positive lens and the third positive lens for projection imaging are sequentially arranged in a light path from the diaphragm to the display unit, the miniaturization of the projection lens is realized by setting the ratio of the tangent value of half of the field angle HFOV of the projection lens to the total length TTL of the projection lens to be more than 0.017, and simultaneously setting the telecentricity Tele of the projection lens to be less than 1 degree, so that the imaging quality of the projection lens can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram illustrating light propagation of a projection lens according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of the projection lens of FIG. 1 according to the present invention;
FIG. 3 is a schematic structural diagram of a projection lens according to a second embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a projection lens according to a third embodiment of the present invention;
FIG. 5 is a MTF chart of the projection lens of FIG. 2 according to the present invention;
FIG. 6 is a dot-sequence diagram of the projection lens of FIG. 2 according to the present invention;
FIG. 7 is a left curvature diagram and a right distortion diagram of the projection lens of FIG. 2 according to the present invention;
FIG. 8 is a diagram illustrating relative illumination of the projection lens of FIG. 2 according to the present invention;
FIG. 9 is a defocus plot of the projection lens of FIG. 2 according to the present invention;
FIG. 10 is a MTF chart of the projection lens of FIG. 3 according to the present invention;
FIG. 11 is a dot-sequence diagram of the projection lens of FIG. 3 according to the present invention;
FIG. 12 is a left curvature diagram and a right distortion diagram of the projection lens of FIG. 3 according to the present invention;
FIG. 13 is a diagram illustrating relative illumination of the projection lens of FIG. 3 according to the present invention;
FIG. 14 is a defocus plot of the projection lens of FIG. 3 according to the present invention;
FIG. 15 is a MTF chart of the projection lens of FIG. 4 according to the present invention;
FIG. 16 is a dot-sequence diagram of the projection lens of FIG. 4 in accordance with the present invention;
FIG. 17 is a left curvature diagram and a right distortion diagram of the projection lens of FIG. 4 according to the present invention;
FIG. 18 is a diagram of relative illumination of the projection lens of FIG. 4 according to the present invention;
fig. 19 is a defocus graph of the projection lens of fig. 4 according to the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | |
520 | Third point of inflection |
| 200 | A first |
530 | |
| 210 | First point of |
600 | |
| 300 | First |
700 | |
| 400 | Second |
800 | |
| 500 | Third |
900 | |
| 510 | Second point of inflection |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1 and fig. 2, a projection lens according to the present invention is configured to receive a projection light 900 emitted by a display unit 800, where the projection light 900 is emitted to a diaphragm 100 through the projection lens, and the projection lens includes:
in an optical path along the direction from the diaphragm 100 to the display unit 800, a first positive lens 200, a first negative lens 300, a second positive lens 400, and a third positive lens 500 for projection imaging are arranged in this order.
Defining the field of view of the projection lens as FOV, half of the field of view of the projection lens as HFOV, the total length from the light emitting surface of the first positive lens 200 to the display image plane of the display unit 800 of the projection lens as the projection lens, and the total length of the projection lens as TTL, then
tan(HFOV)/TTL>0.017
The telecentricity of the projection lens is Tele, then
Tele<1°。
In the technical scheme provided by the invention, the first positive lens 200, the first negative lens 300, the second positive lens 400 and the third positive lens 500 for projection imaging are sequentially arranged in the light path along the direction from the diaphragm 100 to the display unit 800, the miniaturization of the projection lens is realized by setting the ratio of the tangent value of half of the field angle HFOV of the projection lens to the total length TTL of the projection lens to be more than 0.017, and meanwhile, the telecentricity Tele of the projection lens is set to be less than 1 DEG, so that the imaging quality of the projection lens can be improved.
Further, the refractive indexes of the first positive lens 200, the first negative lens 300, the second positive lens 400 and the third positive lens 500 are all in the range of 1.45-1.75, and the dispersion coefficients are all in the range of 50-70, so that the imaging quality of the projection lens can be improved by controlling the refractive indexes and the dispersion coefficients of the first positive lens 200, the first negative lens 300, the second positive lens 400 and the third positive lens 500.
Further, an effective focal length of the projection lens is defined as f, and an effective focal length of the first positive lens 200 is defined as f1The effective focal length of the first negative lens 300 is f2The second positive lens 400 hasEffective focal length f3The effective focal length of the third positive lens 500 is f4Then, then
1<f/f1<1.5，-3.7<f/f2<-2，0.5<f/f3<1.5，0.5<f/f4<1.3, through the effective focal length of control projection lens, respectively with the effective focal length of first positive lens 200, the effective focal length of first negative lens 300, the effective focal length of second positive lens 400 and the ratio scope of the effective focal length of third positive lens 500, make projection lens further miniaturized, improve projection lens's image quality simultaneously.
Referring to fig. 5-9, further, the light emitting surface of the first positive lens 200 has at least one first inflection point 210, the first inflection point 210 is disposed at the edge of the first positive lens 200, the light incident surface of the first positive lens 200 is convex toward the incident direction of the projection light 900, the first negative lens 300 is a meniscus lens, the light emitting surface of the first negative lens 300 is concave toward the emergent direction of the projection light 900, the light incident surface of the first negative lens 300 is convex toward the incident direction of the projection light 900, the second positive lens 400 is a meniscus lens, the light emitting surface of the second positive lens 400 is concave toward the emergent direction of the projection light 900, the light incident surface of the second positive lens 400 is convex toward the incident direction of the projection light 900, the thickness of the second positive lens 400 is between 1.5mm and 1.7mm, the light incident surface of the third positive lens 500 has at least one second inflection point 510, the second inflection point 510 is disposed at the edge of the third positive lens 500, the central area of the light-emitting surface of the third positive lens 500 is convex toward the emergent direction of the projection light, the central area of the light-in surface of the third positive lens 500 is concave toward the incident direction of the projection light 900, and the inflection point is generally used for correcting off-axis aberration, so that the miniaturization of the projection lens is improved, and the imaging quality of the projection lens is improved at the same time, wherein fig. 5 is an MTF modulation transfer function diagram, which is a method for analyzing the quality of the lens and is mainly used for reflecting the imaging definition, the higher the MTF value is, the clearer the imaging is, fig. 6 is a point array diagram of the projection lens, an ideal optical system should be an image point on the image surface, however, the optical system has aberration, which results in the final imaging into an image spot, and the point array diagram mainly reflects the aberration condition of; in fig. 7, the left image is a field curvature diagram reflecting the image plane curvature condition with clear imaging, and the right image is a distortion diagram reflecting the deformation condition of imaging; FIG. 8 is a relative illumination chart reflecting the uniformity of the brightness of the image; fig. 9 is a defocus graph, and MTF relationship graphs of different image plane positions and different fields of view.
Referring to fig. 3 and 10-14, the first positive lens 200 is a biconvex lens, the light emitting surface of the first negative lens 300 is concave towards the emitting direction of the projection light 900, the light incident surface of the first negative lens 300 is convex towards the incident direction of the projection light 900, the second positive lens 400 is a meniscus lens, the light emitting surface of the second positive lens 400 is concave towards the emitting direction of the projection light 900, the light incident surface of the second positive lens 400 is convex towards the incident direction of the projection light 900, the thickness of the second positive lens 400 is between 0.8mm and 0.9mm, the light incident surface of the third positive lens 500 at least has a third inflection point 520, the third inflection point 520 is disposed at the edge of the third positive lens 500, the central region of the light emitting surface of the third positive lens 500 is convex towards the emitting direction of the projection light 900, the central region of the light incident surface of the third positive lens 500 is concave towards the incident direction of the projection light 900, therefore, the miniaturization of the projection lens is improved, and the imaging quality of the projection lens is improved at the same time, wherein fig. 10 is an MTF modulation transfer function graph, which is a method for analyzing the quality of the lens and is mainly used for reflecting the imaging definition, the higher the MTF value is, the clearer the imaging is, fig. 11 is a point diagram of the projection lens, an ideal optical system should be an image point on an image plane, however, the optical system has aberration, which causes the final imaging to be a possible image spot, and the point diagram mainly reflects the aberration condition of the lens; in fig. 12, the left image is a field curvature diagram reflecting the image plane curvature condition with clear imaging, and the right image is a distortion diagram reflecting the deformation condition of imaging; FIG. 13 is a relative luminance graph reflecting the uniformity of the brightness of the image; fig. 14 is a defocus graph, and MTF relationship graphs of different image plane positions and different fields of view.
Referring to fig. 4 and 15-19, the first positive lens 200 is a biconvex lens, the light emitting surface of the first negative lens 300 is concave towards the emitting direction of the projection light 900, the light incident surface of the first negative lens 300 is convex towards the incident direction of the projection light 900, the second positive lens 400 is a meniscus lens, the light emitting surface of the second positive lens 400 is concave towards the emitting direction of the projection light 900, the light incident surface of the second positive lens 400 is convex towards the incident direction of the projection light 900, the thickness of the second positive lens 400 is between 1.3mm and 1.4mm, the light incident surface of the third positive lens 500 at least has a fourth inflection point 530, the fourth inflection point 530 is disposed at the edge of the third positive lens 500, the central region of the light emitting surface of the third positive lens 500 is convex towards the emitting direction of the projection light 900, the central region of the light incident surface of the third positive lens 500 is concave towards the incident direction of the projection light 900, therefore, the miniaturization of the projection lens is improved, and the imaging quality of the projection lens is improved at the same time, wherein fig. 15 is an MTF modulation transfer function graph, which is a method for analyzing the quality of the lens and is mainly used for reflecting the imaging definition, the higher the MTF value is, the sharper the imaging is, fig. 16 is a point diagram of the projection lens, an ideal optical system should be an image point on an image plane, however, the optical system has aberration, which causes the final imaging to be a possible image spot, and the point diagram mainly reflects the aberration condition of the lens; in fig. 17, the left image is a field curvature diagram reflecting the image plane curvature condition with clear imaging, and the right image is a distortion diagram reflecting the deformation condition of imaging; FIG. 18 is a relative luminance graph reflecting the uniformity of the brightness of the image; fig. 19 is a defocus graph, and MTF relationship diagrams of different image plane positions and different fields of view.
Further, a turning prism 600 for turning the light path is disposed in the light path between the third positive lens 500 and the display unit 800, and a protective glass 700 is disposed in the display unit 800 facing the incident direction of the projection light, wherein the turning prism 600 is used for converting the advancing direction of the projection light, so as to further shorten the light path, which is beneficial to the miniaturization of the projection lens, and the protective glass 700 is used for protecting the display unit 800, thereby preventing the display unit 800 from being damaged by external force and causing the abnormal use.
Furthermore, the total length of the projection lens is TTL which is less than 21.4mm, the height of the projection lens in the vertical direction is DIA which is less than 10mm, the total length of the projection lens is controlled to be TTL which is less than 21.4mm, and the height of the projection lens in the vertical direction is controlled to be DIA which is less than 10mm, so that the size of the projection lens can be effectively limited, and the miniaturization is facilitated.
Furthermore, the distance from the light-emitting surface of the first positive lens 200 of the projection lens to the diaphragm 100 is 5mm, and the first positive lens 200, the first negative lens 300, the second positive lens 400 and the third positive lens 500 are all made of plastic materials, for example, OKP1, APEL or E48R, which are easy to process and have low cost, and can be injection molded as required to facilitate processing and manufacturing of complex structure patterns.
The present invention also provides a projection display device comprising: the projection lens is used for receiving the projection light 900 emitted by the display unit 800, the projection light 900 is emitted to the diaphragm 100 through the projection lens, the projection lens is arranged in the housing, and the projection lens comprises a first positive lens 200, a first negative lens 300, a second positive lens 400 and a third positive lens 500 which are sequentially arranged in a light path from the diaphragm 100 to the display unit 800 and used for projection imaging.
Defining the field angle of the projection lens as FOV, half of the field angle of the projection lens as HFOV, the total length from the light-emitting surface of the first positive lens 200 of the projection lens to the display image plane of the display unit 800 as the projection lens, and when the total length of the projection lens is TTL, tan (HFOV)/TTL is greater than 0.017, and when the telecentricity of the projection lens is Tele, Tele is less than 1 deg.
In the technical solution provided in this embodiment, a first positive lens 200, a first negative lens 300, a second positive lens 400, and a third positive lens 500 for projection imaging are sequentially disposed in an optical path along the direction from the diaphragm 100 to the display unit 800, and a ratio of a tangent value of half of an angle of view of the projection lens HFOV to a total length TTL of the projection lens is set to be greater than 0.017, so that the projection lens is miniaturized, and a degree of telecentricity Tele of the projection lens is set to be less than 1 °, so that an imaging quality of the projection lens can be improved.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A projection lens is characterized in that the projection lens is used for receiving projection light emitted by a display unit, the projection light is emitted to a diaphragm through the projection lens, and the projection lens comprises:
a first positive lens, a first negative lens, a second positive lens and a third positive lens for projection imaging are sequentially arranged along the direction from the diaphragm to the display unit, the refractive index ranges of the first positive lens, the first negative lens, the second positive lens and the third positive lens are all 1.45-1.75, and the dispersion coefficients are all 50-70;
defining the field angle of the projection lens as FOV, wherein half of the field angle of the projection lens is HFOV, the total length from the light emitting surface of the first positive lens of the projection lens to the display imaging surface of the display unit is the total length of the projection lens, and the total length of the projection lens is TTL (transistor-transistor logic), then
tan(HFOV)/TTL>0.017
The telecentricity of the projection lens is Tele, then
Tele<1°；
Defining the effective focal length of the projection lens as f, and the effective focal length of the first positive lens as f1The effective focal length of the first negative lens is f2The effective focal length of the second positive lens is f3The effective focal length of the third positive lens is f4Then, then
1<f/f1<1.5，-3.7<f/f2<-2，0.5<f/f3<1.5，0.5<f/f4<1.3。
2. The projection lens as claimed in claim 1, wherein the light exiting surface of the first positive lens has at least one first inflection point, the first inflection point is disposed at an edge of the first positive lens, the light entering surface of the first positive lens is convex toward the incident direction of the projection light, the first negative lens is a meniscus lens, the light exiting surface of the first negative lens is concave toward the exit direction of the projection light, the light entering surface of the first negative lens is convex toward the incident direction of the projection light, the second positive lens is a meniscus lens, the light exiting surface of the second positive lens is concave toward the exit direction of the projection light, the light entering surface of the second positive lens is convex toward the incident direction of the projection light, the thickness of the second positive lens is between 1.5mm and 1.7mm, the light entering surface of the third positive lens has at least one second inflection point, the second inflection point is arranged at the edge of the third positive lens, the central region of the light emitting surface of the third positive lens faces the projection light emergent direction and is convex, and the central region of the light incident surface of the third positive lens faces the projection light incident direction and is concave.
3. The projection lens of claim 1 wherein the first positive lens is a biconvex lens, the light-emitting surface of the first negative lens is concave towards the emergent direction of the projection light, the light-entering surface of the first negative lens is convex towards the incident direction of the projection light, the second positive lens is a concave-convex lens, the light-emitting surface of the second positive lens is concave towards the emitting direction of the projection light, the light incident surface of the second positive lens protrudes towards the incident direction of the projection light, the thickness of the second positive lens is between 0.8mm and 0.9mm, the light incident surface of the third positive lens is provided with at least one third inflection point, the third inflection point is arranged at the edge of the third positive lens, and the central area of the light-emitting surface of the third positive lens is convex towards the emergent direction of the projection light, the central area of the light incident surface of the third positive lens is concave towards the incident direction of the projection light.
4. The projection lens of claim 1 wherein the first positive lens is a biconvex lens, the light-emitting surface of the first negative lens is concave towards the emergent direction of the projection light, the light-entering surface of the first negative lens is convex towards the incident direction of the projection light, the second positive lens is a concave-convex lens, the light-emitting surface of the second positive lens is concave towards the emitting direction of the projection light, the light incident surface of the second positive lens protrudes towards the incident direction of the projection light, the thickness of the second positive lens is between 1.3mm and 1.4mm, the light incident surface of the third positive lens is provided with at least one fourth inflection point, the fourth inflection point is arranged at the edge of the third positive lens, and the central area of the light-emitting surface of the third positive lens is convex towards the emergent direction of the projection light, the central area of the light incident surface of the third positive lens is concave towards the incident direction of the projection light.
5. The projection lens according to any one of claims 1 to 4, wherein a turning prism for turning a light path is disposed in a light path between the third positive lens and the display unit, and the display unit is provided with a cover glass facing an incident direction of the projection light.
6. The projection lens of any of claims 1-4 wherein the total length of the projection lens is TTL, TTL is less than 21.4mm, and the height of the projection lens in the vertical direction is DIA, DIA is less than 10 mm.
7. The projection lens as claimed in any of claims 1 to 4, wherein a distance between a light-emitting surface of the first positive lens of the projection lens and the diaphragm is 5mm, and the first positive lens, the first negative lens, the second positive lens and the third positive lens are all made of plastic material.
8. A projection display device, comprising: a housing and a projection lens according to any of claims 1 to 7, the projection lens being disposed within the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910499901.2A CN110174751B (en) | 2019-06-06 | 2019-06-06 | Projection lens and projection display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910499901.2A CN110174751B (en) | 2019-06-06 | 2019-06-06 | Projection lens and projection display device |
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| Publication Number | Publication Date |
|---|---|
| CN110174751A CN110174751A (en) | 2019-08-27 |
| CN110174751B true CN110174751B (en) | 2021-06-18 |
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| CN201910499901.2A Active CN110174751B (en) | 2019-06-06 | 2019-06-06 | Projection lens and projection display device |
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| CN110879471B (en) * | 2019-11-26 | 2022-04-22 | 歌尔光学科技有限公司 | Optical system, projection apparatus, and head-mounted apparatus |
| CN112346213A (en) * | 2020-11-23 | 2021-02-09 | 深微光电科技(深圳)有限公司 | Universal image conversion lens and optical equipment for prism compensation |
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| CN1475828A (en) * | 2002-07-18 | 2004-02-18 | ������������ʽ���� | Image pickup lens, image pickup device and portable terminal equipment |
| CN101144897A (en) * | 2006-09-11 | 2008-03-19 | 三星Techwin株式会社 | Photographic lens |
| JP2009086566A (en) * | 2007-10-03 | 2009-04-23 | Olympus Corp | Imaging optical system |
| CN109814235A (en) * | 2018-12-28 | 2019-05-28 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1475828A (en) * | 2002-07-18 | 2004-02-18 | ������������ʽ���� | Image pickup lens, image pickup device and portable terminal equipment |
| CN101144897A (en) * | 2006-09-11 | 2008-03-19 | 三星Techwin株式会社 | Photographic lens |
| JP2009086566A (en) * | 2007-10-03 | 2009-04-23 | Olympus Corp | Imaging optical system |
| CN109814235A (en) * | 2018-12-28 | 2019-05-28 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
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