CN110879457A - Projection optical system and projection apparatus - Google Patents
Projection optical system and projection apparatus Download PDFInfo
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- CN110879457A CN110879457A CN201911188702.6A CN201911188702A CN110879457A CN 110879457 A CN110879457 A CN 110879457A CN 201911188702 A CN201911188702 A CN 201911188702A CN 110879457 A CN110879457 A CN 110879457A
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Abstract
The invention discloses a projection optical system and projection equipment, wherein the projection optical system sequentially comprises a light source, a first lens group and a reflector along a light transmission direction; the first lens group comprises a first lens, a second lens, a third lens and a fourth lens; the first lens is a negative focal power lens; the second lens is a positive focal power lens; the third lens is a positive focal power lens; the fourth lens is a negative focal power lens. The invention provides a projection optical system and projection equipment, which solve the problems that in the prior art, a projector has low projection ratio and cannot project large-size images at a short distance.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a projection optical system and projection equipment.
Background
With the development of the prior art, projectors are developed towards a plurality of directions one by one, and in order to meet different use requirements of different customers, the projectors also have multiple types, wherein an ultra-short-focus projector can realize transmission of large-size images within a short distance, so that the ultra-short-focus projector is one of key development trends of the projectors, and the existing ultra-short-focus projector mainly comprises three projection modes: the projection ratio of the existing ultra-short focus projector is usually over 0.4, and when a user needs to use the projector to project a large-size image at a shorter distance, the problem can be solved only by increasing the projection distance, and the large-size image projection at the shorter distance cannot be realized.
Disclosure of Invention
The invention provides a projection optical system and projection equipment, and aims to solve the problems that in the prior art, a projector has low projection ratio and cannot project large-size images at a short distance.
In order to achieve the above object, the present invention provides a projection optical system, which sequentially comprises a light source, a first lens group and a reflector along a light transmission direction;
the first lens group comprises a first lens, a second lens, a third lens and a fourth lens;
the first lens is a negative focal power lens;
the second lens is a positive focal power lens;
the third lens is a positive focal power lens;
the fourth lens is a negative focal power lens.
Optionally, the light incident surface of the first lens along the optical axis direction is of a convex spherical structure, and the light emergent surface along the optical axis direction is of a concave spherical structure;
the light incident surface of the second lens along the optical axis direction is of a convex spherical structure, and the light emergent surface along the optical axis direction is of a convex spherical structure;
the light incident surface of the third lens along the optical axis direction is of a convex spherical structure, and the light emergent surface along the optical axis direction is of a concave spherical structure;
the light incident surface of the fourth lens along the optical axis direction is of a concave spherical structure, and the light emergent surface along the optical axis direction is of a concave spherical structure.
Optionally, the projection optical system further includes a second lens group, the second lens group is disposed between the light source and the first lens group, and the second lens group includes a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens;
the fifth lens is a positive focal power lens;
the sixth lens is a positive focal power lens;
the seventh lens is a negative focal power lens;
the eighth lens is a positive focal power lens;
the ninth lens is a positive focal power lens;
the tenth lens is a negative power lens.
Optionally, the light incident surface of the fifth lens along the optical axis direction is of a convex spherical structure, and the light emergent surface along the optical axis direction is of a convex spherical structure;
the light incident surface of the sixth lens along the optical axis direction is of a convex spherical structure, and the light emergent surface along the optical axis direction is of a convex spherical structure;
the light incident surface of the seventh lens along the optical axis direction is of a concave spherical structure, and the light emergent surface along the optical axis direction is of a concave spherical structure;
the light incident surface of the eighth lens along the optical axis direction is of a convex spherical structure, and the light emergent surface along the optical axis direction is of a convex spherical structure;
the light incident surface of the ninth lens along the optical axis direction is of a convex spherical structure, and the light emergent surface along the optical axis direction is of a convex spherical structure;
the light incident surface of the tenth lens along the optical axis direction is of a concave spherical structure, and the light emergent surface along the optical axis direction is of a convex spherical structure or a concave spherical structure.
Optionally, the seventh lens is connected with the eighth lens in a gluing mode.
Optionally, the projection optical system further includes a diaphragm, and the diaphragm is disposed between the second lens group and the first lens group.
Optionally, the projection optical system further includes an eleventh lens, the eleventh lens is disposed between the first lens group and the reflector, the eleventh lens is a negative focal power lens, a light incident surface of the eleventh lens along the optical axis direction is a concave aspheric surface structure, and a light emergent surface along the optical axis direction is a concave aspheric surface structure.
Optionally, the projection optical system further includes a twelfth lens, the twelfth lens is disposed between the eleventh lens and the reflector, the twelfth lens is a positive power lens, a light incident surface of the twelfth lens along the optical axis direction is a convex aspheric structure, and a light emergent surface along the optical axis direction is a concave aspheric structure.
Optionally, the projection optical system satisfies the following relationship: 0.1< f1/f2<1,0.5< f2/f3< 1;
wherein f1 is a focal length of the second lens group, f2 is a combined focal length of the first to fourth lenses and the eleventh lens along a light transmission direction, and f3 is a focal length of the twelfth lens.
Optionally, the projection optical system satisfies the following relationship: 0.1< A1/A3<0.5, -0.5< A2/TTL < -0.1, -0.015< EFFL/TTL < -0.01;
wherein a1 is a distance between the sixth lens and the seventh lens, a2 is a distance between the tenth lens and the first lens, A3 is a distance between the eleventh lens and the twelfth lens, EFFL is a focal length of the projection optical system, and TTL is a total length of the projection optical system.
Optionally, the projection optical system satisfies the following relationship: vd5 is less than or equal to 40, Vd7 is less than or equal to 40, Vd10 is less than or equal to 40, and Vd2 is less than or equal to 40;
wherein the Vd5 denotes an abbe number of the fifth lens, the Vd7 denotes an abbe number of the seventh lens, the Vd10 denotes an abbe number of the tenth lens, and the Vd2 denotes an abbe number of the second lens.
Optionally, the projection optical system satisfies the following relationship: vd6 is more than or equal to 55, Vd8 is more than or equal to 55, Vd9 is more than or equal to 55, Vd1 is more than or equal to 55, Vd3 is more than or equal to 55, Vd4 is more than or equal to 55, Vd11 is more than or equal to 55, and Vd12 is more than or equal to 55;
wherein the Vd6 denotes an abbe number of the sixth lens, the Vd8 denotes an abbe number of the eighth lens, the Vd9 denotes an abbe number of the ninth lens, the Vd1 denotes an abbe number of the first lens, the Vd3 denotes an abbe number of the third lens, the Vd4 denotes an abbe number of the fourth lens, the Vd11 denotes an abbe number of the eleventh lens, and the Vd12 denotes an abbe number of the twelfth lens.
In order to achieve the above object, the present application provides a projection apparatus, which includes a housing and the projection optical system according to any one of the above embodiments, wherein the projection optical system is accommodated in the housing.
In the technical scheme provided by the application, the projection optical system sequentially comprises a light source, a first lens group and a reflector along a light transmission direction, wherein the first lens group comprises a first lens, a second lens, a third lens and a fourth lens; the projector comprises a first lens, a second lens, a third lens, a reflector and a projection optical system, wherein the first lens is a negative focal power lens, the second lens is a positive focal power lens, the third lens is a positive focal power lens, light rays emitted by a light source are reflected by the reflector after passing through a first lens group and projected to a screen, and the projection ratio of the projection optical system is reduced through the combined action of the first lens, the second lens, the third lens and the fourth lens and the catadioptric projection mode, so that the projector can project large-size images in a short distance, and the problems that the projection ratio of the projector in the prior art is low and large-size image projection cannot be carried out in a short distance are solved.
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 view of a projection optical system according to the present invention;
FIG. 2 is a diagram of the modulation transfer function of the first embodiment of the present invention;
FIG. 3 is an axial spherical aberration diagram of the first embodiment of the present invention;
FIG. 4 is a vertical axis color difference chart of the first embodiment of the present invention;
fig. 5 is a relative illuminance diagram of the first embodiment of the present invention.
The reference numbers illustrate:
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.
The invention provides a projection optical system and a projection apparatus.
Referring to fig. 1, the projection optical system sequentially includes a light source 10, a first lens group 20, a reflector 60 and a screen along a light transmission direction,
the first lens group 20 comprises a first lens 21, a second lens 22, a third lens 23 and a fourth lens 24;
the first lens 21 is a negative focal power lens;
the second lens 22 is a positive power lens;
the third lens 23 is a positive focal power lens;
the fourth lens 24 is a negative power lens.
The focal power is used for representing the capability of the optical system to deflect light rays, wherein when the lens is a positive focal power lens, the lens has the capability of converging the light rays, and when the lens is a negative focal power lens, the lens has the capability of diverging the light rays.
The Light source 10 is a display chip, and specifically, the display chip is a digital Micro-mirror Device (DMD) display chip, it is to be understood that the display chip is not limited thereto, and the display chip may also be a Liquid Crystal On Silicon (LCOS) chip, a Laser scanning (LBS) chip, an Organic Light-Emitting Diode (OLED) chip, a Mini LED (Mini Light Emitting Diode, Micro LED) chip, or a Micro Light-Emitting Diode (Micro LED) chip.
The light emitted by the light source 10 sequentially passes through the first lens 21, the second lens 22, the third lens 23 and the fourth lens 24, then is emitted to the reflector 60, and is reflected to the screen by the reflector 60, and the projection ratio of the projection optical system is reduced through the combined action of the first lens 21, the second lens 22, the third lens 23 and the fourth lens 24 and the catadioptric projection mode, so that the projector can project large-size images in a short distance, and the problems that the projection ratio of the projector in the prior art is low, and large-size image projection cannot be performed in a short distance are solved.
In an optional embodiment, the light incident surface of the first lens 21 along the optical axis direction is a convex spherical structure, and the light emergent surface along the optical axis direction is a concave spherical structure;
the light incident surface of the second lens 22 along the optical axis direction is of a convex spherical structure, and the light emergent surface along the optical axis direction is of a convex spherical structure;
the light incident surface of the third lens 23 along the optical axis direction is of a convex spherical structure, and the light emergent surface along the optical axis direction is of a concave spherical structure;
the light incident surface of the fourth lens 24 along the optical axis direction is a concave spherical structure, and the light emergent surface along the optical axis direction is a concave spherical structure.
In an alternative embodiment, the projection optical system further includes a second lens group 30, the second lens group 30 is disposed between the light source 10 and the first lens group 20, and the second lens group 30 includes a fifth lens 31, a sixth lens 32, a seventh lens 33, an eighth lens 34, a ninth lens 35, and a tenth lens 36;
the fifth lens 31 is a positive focal power lens;
the sixth lens 32 is a positive power lens;
the seventh lens 33 is a negative power lens;
the eighth lens 34 is a positive power lens;
the ninth lens 35 is a positive power lens;
the tenth lens 36 is a negative power lens.
In a preferred embodiment of the foregoing embodiment, the light incident surface of the fifth lens element 31 along the optical axis direction is a convex spherical structure, and the light exiting surface along the optical axis direction is a convex spherical structure;
the light incident surface of the sixth lens element 32 along the optical axis direction is of a convex spherical structure, and the light emergent surface along the optical axis direction is of a convex spherical structure;
the light incident surface of the seventh lens 33 along the optical axis direction is of a concave spherical structure, and the light emergent surface along the optical axis direction is of a concave spherical structure;
the light incident surface of the eighth lens 34 along the optical axis direction is of a convex spherical structure, and the light emergent surface along the optical axis direction is of a convex spherical structure;
the light incident surface of the ninth lens 35 along the optical axis direction is of a convex spherical structure, and the light emergent surface along the optical axis direction is of a convex spherical structure;
the light incident surface of the tenth lens 36 along the optical axis direction is a concave spherical surface structure, and the light emergent surface along the optical axis direction is a convex spherical surface structure or a concave spherical surface structure.
Light emitted by the light source 10 sequentially passes through the fifth lens 31, the sixth lens 32, the seventh lens 33, the eighth lens 34, the ninth lens 35 and the tenth lens 36 and then enters the first lens group 20, and then sequentially passes through the first lens 21, the second lens 22, the third lens 23 and the fourth lens 24 and then is transmitted to the reflector 60, and the light is transmitted to the screen after being reflected by the reflector 60. Specifically, the second lens group 30 is configured to balance spherical aberration, chromatic aberration, and telecentricity of the projection optical system, where the telecentricity describes an angle of a chief ray deviating from an optical axis in the optical system, and when the chief ray deviates from the optical axis by an angle smaller, the telecentricity is better, and the imaging is more accurate.
In an alternative embodiment, the seventh lens 33 is cemented with the eighth lens 34, and in particular, when the seventh lens 33 is cemented with the eighth lens 34, it can be used to eliminate chromatic aberration of the projection optical system. In another embodiment, the seventh lens element 33 and the eighth lens element 34 are in close contact with each other.
In an optional embodiment, the projection optical system further includes a diaphragm 50, and the diaphragm 50 is disposed between the second lens group 30 and the first lens group 20, where the diaphragm 50 refers to an optical element used for limiting a light beam in the optical system, and is mainly used for limiting a light ray or a field size of the optical system, and specifically, the diaphragm 50 is used for limiting a light ray size entering the first lens group 20 from the second lens group 30.
In an optional embodiment, the projection optical system further includes an eleventh lens 41, the eleventh lens 41 is disposed between the first lens group 20 and the reflecting mirror 60, the eleventh lens 41 is a negative power lens, a light incident surface of the eleventh lens 41 along the optical axis direction is a concave aspheric structure, and a light emergent surface along the optical axis direction is a concave aspheric structure. Specifically, the eleventh lens 41 is configured to reduce distortion of the projection optical system.
When the surface of the lens is of an aspheric structure, the edge aberration of the lens can be effectively reduced, and the performance of the projection lens is improved. Through the aspheric surface structure, the effect of correcting aberration of the spherical lenses is effectively realized, and the projection lens is favorably miniaturized.
In an optional embodiment, the projection optical system further includes a twelfth lens 42, the twelfth lens 42 is disposed between the eleventh lens 41 and the reflecting mirror 60, the twelfth lens 42 is a positive power lens, a light incident surface of the twelfth lens 42 along the optical axis direction is a convex aspheric surface structure, and a light exiting surface along the optical axis direction is a concave aspheric surface structure. Specifically, the twelfth lens 42 is configured to reduce astigmatism of the projection optical system.
In an alternative embodiment, each lens of the first lens group 20 and the second lens group 30 is made of an optical glass material, and the eleventh lens 41 and the twelfth lens 42 are made of an optical plastic material. Specifically, in the working process of the projection apparatus, the light source 10 gradually heats, so as to avoid the influence of heat emitted by the light source 10 on the projection optical system, and deform the lens of the projection optical system, and the optical glass has better thermal stability compared with the optical plastic, so that the first lens group 20 and the second lens group 30 close to the light source 10 are made of the optical glass material, thereby avoiding the influence of high temperature on the imaging of other lenses, and the optical plastic has the advantages of strong plasticity, light weight and low processing cost compared with the optical glass, so that the eleventh lens 41 and the twelfth lens 42 far away from the light source 10 are made of the optical plastic material.
In an alternative embodiment, the projection optical system satisfies the following relationship: 0.1< f1/f2<1,0.5< f2/f3< 1;
wherein f1 is the focal length of the second lens group 30, f2 is the combined focal length of the first through fourth lenses 21 through 24 and the eleventh lens 41 along the light transmission direction, and f3 is the focal length of the twelfth lens 42.
In an alternative embodiment, the projection optical system satisfies the following relationship: 0.1< A1/A3<0.5, -0.5< A2/TTL < -0.1, -0.015< EFFL/TTL < -0.01;
wherein, the a1 is a distance between the sixth lens 32 and the seventh lens 33, the a2 is a distance between the tenth lens 36 and the first lens 21, the A3 is a distance between the eleventh lens 41 and the twelfth lens 42, the EFFL is a focal length of the projection optical system, and the TTL is a total length of the projection optical system.
In an alternative embodiment, the projection optical system satisfies the following relationship: vd5 is less than or equal to 40, Vd7 is less than or equal to 40, Vd10 is less than or equal to 40, and Vd2 is less than or equal to 40;
wherein the Vd5 denotes an abbe number of the fifth lens 31, the Vd7 denotes an abbe number of the seventh lens 33, the Vd10 denotes an abbe number of the tenth lens 36, and the Vd2 denotes an abbe number of the second lens 22.
In an alternative embodiment, the projection optical system satisfies the following relationship: vd6 is more than or equal to 55, Vd8 is more than or equal to 55, Vd9 is more than or equal to 55, Vd1 is more than or equal to 55, Vd3 is more than or equal to 55, Vd4 is more than or equal to 55, Vd11 is more than or equal to 55, and Vd12 is more than or equal to 55;
wherein Vd6 denotes an abbe number of the sixth lens 32, Vd8 denotes an abbe number of the eighth lens 34, Vd9 denotes an abbe number of the ninth lens 35, Vd1 denotes an abbe number of the first lens 21, Vd3 denotes an abbe number of the third lens 23, Vd4 denotes an abbe number of the fourth lens 24, Vd11 denotes an abbe number of the eleventh lens 41, and Vd12 denotes an abbe number of the twelfth lens 42.
First embodiment
In the first embodiment, the optical system design data is as shown in table 1 below:
TABLE 1
The eleventh lens 41 and the twelfth lens 42 are both aspheric structures, wherein a4, a6, A8, a10, and a12 are aspheric high-order term coefficients of aspheric lenses, as shown in table 2.
TABLE 2
In the first embodiment, the parameters are as follows:
the spacing distance a1 between the sixth lens 32 and the seventh lens 33 is 4.9 mm;
the spacing distance a2 between the tenth lens 36 and the first lens 21 is 20.7 mm;
the spacing distance a3 between the eleventh lens 41 and the twelfth lens 42 is 18.4 mm;
the focal length EFFL of the projection optical system is-2.42;
the total length TTL of the projection optical system is 195 mm;
focal length f1 of second lens group 30 is 20.28 mm;
a combined focal length of the first lens 21 to the fourth lens 24 and the eleventh lens 41 is 82.36 mm;
the focal length of the twelfth lens 42 is 106.57 mm;
f1/f2＝0.246；f2/f3＝0.773；
A1/A3＝0.266；A2/TTL＝-0.106；EFFL/TTL＝-0.0124；
the first lens 21 has an abbe number of 56.2;
the second lens 22 has an abbe number of 33.3;
the third lens 23 has an abbe number of 59.5;
the fourth lens 24 has an abbe number of 55.1;
the fifth lens 31 has an abbe number of 25.7;
the abbe number of the sixth lens 32 is 57.4;
the abbe number of the seventh lens 33 is 35.7;
the abbe number of the eighth lens 34 is 64.2;
the abbe number of the ninth lens 35 is 62.7;
the abbe number of the tenth lens 36 is 30.1;
the abbe number of the eleventh lens 41 is 56.0;
the twelfth lens 42 has an abbe number of 56.0;
the projection optical system of the first embodiment has a projection ratio of 0.254.
Referring to fig. 2, fig. 2 is a Modulation Transfer Function (MTF) diagram of the first embodiment, wherein the MTF is a relationship between Modulation degree and a line-per-millimeter logarithm in an image for evaluating detail restoring capability of a scene.
Referring to fig. 3, fig. 3 is an axial spherical aberration diagram of the first embodiment, specifically, after a concentric light beam emitted from an on-axis point passes through an optical system, the concentric light beam is no longer a concentric light beam, and light rays with different incident heights intersect the optical axis at different positions and have different degrees of deviation from an paraxial image point, which is called axial spherical aberration.
Referring to fig. 4, fig. 4 is a vertical axis chromatic aberration diagram of the first embodiment, in which the vertical axis chromatic aberration is also called magnification chromatic aberration, which mainly refers to a difference between a primary polychromatic light of an object side and a focus position of a hydrogen blue light and a hydrogen red light on an image plane, wherein the primary polychromatic light is converted into a plurality of light rays when the primary polychromatic light exits from the image side due to chromatic dispersion of a refraction system; in the first embodiment, the maximum dispersion of the optical system is the maximum position of the field of view of the optical system, and the maximum chromatic aberration value of the optical system is less than 4 μm, which can meet the requirements of users.
Referring to fig. 5, fig. 5 is a graph of relative illuminance of the first embodiment, wherein the relative illuminance refers to a ratio of illuminance at different coordinate points of the image plane to illuminance at a center point.
The present invention further provides a projection apparatus, where the projection apparatus includes the projection optical system according to any of the above embodiments, and the specific structure of the projection optical system refers to the above embodiments, and since the projection optical system adopts all technical solutions of all the above embodiments, at least all beneficial effects brought by the technical solutions of the above embodiments are achieved, and details are not repeated here.
The above description is only a preferred embodiment of the present invention, and is 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 (13)
1. A projection optical system is characterized by comprising a light source, a first lens group and a reflector in sequence along a light transmission direction;
the first lens group comprises a first lens, a second lens, a third lens and a fourth lens;
the first lens is a negative focal power lens;
the second lens is a positive focal power lens;
the third lens is a positive focal power lens;
the fourth lens is a negative focal power lens.
2. The projection optical system of claim 1, wherein the light incident surface of the first lens along the optical axis direction is a convex spherical structure, and the light emergent surface along the optical axis direction is a concave spherical structure;
the light incident surface of the second lens along the optical axis direction is of a convex spherical structure, and the light emergent surface along the optical axis direction is of a convex spherical structure;
the light incident surface of the third lens along the optical axis direction is of a convex spherical structure, and the light emergent surface along the optical axis direction is of a concave spherical structure;
the light incident surface of the fourth lens along the optical axis direction is of a concave spherical structure, and the light emergent surface along the optical axis direction is of a concave spherical structure.
3. The projection optical system according to any one of claims 1 or 2, further comprising a second lens group provided between the light source and the first lens group, the second lens group including a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens;
the fifth lens is a positive focal power lens;
the sixth lens is a positive focal power lens;
the seventh lens is a negative focal power lens;
the eighth lens is a positive focal power lens;
the ninth lens is a positive focal power lens;
the tenth lens is a negative power lens.
4. The projection optical system of claim 3, wherein the light incident surface of the fifth lens along the optical axis direction is a convex spherical structure, and the light emergent surface along the optical axis direction is a convex spherical structure;
the light incident surface of the sixth lens along the optical axis direction is of a convex spherical structure, and the light emergent surface along the optical axis direction is of a convex spherical structure;
the light incident surface of the seventh lens along the optical axis direction is of a concave spherical structure, and the light emergent surface along the optical axis direction is of a concave spherical structure;
the light incident surface of the eighth lens along the optical axis direction is of a convex spherical structure, and the light emergent surface along the optical axis direction is of a convex spherical structure;
the light incident surface of the ninth lens along the optical axis direction is of a convex spherical structure, and the light emergent surface along the optical axis direction is of a convex spherical structure;
the light incident surface of the tenth lens along the optical axis direction is of a concave spherical structure, and the light emergent surface along the optical axis direction is of a convex spherical structure or a concave spherical structure.
5. The projection optical system according to claim 3, wherein the seventh lens is cemented to the eighth lens.
6. The projection optical system according to claim 3, further comprising a diaphragm provided between the second lens group and the first lens group.
7. The projection optical system as claimed in claim 3, further comprising an eleventh lens disposed between the first lens group and the reflector, wherein the eleventh lens is a negative power lens, a light incident surface of the eleventh lens along the optical axis direction is a concave aspheric structure, and a light emergent surface along the optical axis direction is a concave aspheric structure.
8. The projection optical system according to claim 7, further comprising a twelfth lens, wherein the twelfth lens is disposed between the eleventh lens and the reflector, the twelfth lens is a positive power lens, a light incident surface of the twelfth lens along the optical axis direction has a convex aspheric structure, and a light emitting surface of the twelfth lens along the optical axis direction has a concave aspheric structure.
9. The projection optical system according to claim 8, wherein the projection optical system satisfies the following relationship: 0.1< f1/f2<1,0.5< f2/f3< 1;
wherein f1 is a focal length of the second lens group, f2 is a combined focal length of the first to fourth lenses and the eleventh lens along a light transmission direction, and f3 is a focal length of the twelfth lens.
10. The projection optical system according to claim 8, wherein the projection optical system satisfies the following relationship: 0.1< A1/A3<0.5, -0.5< A2/TTL < -0.1, -0.015< EFFL/TTL < -0.01;
wherein a1 is a distance between the sixth lens and the seventh lens, a2 is a distance between the tenth lens and the first lens, A3 is a distance between the eleventh lens and the twelfth lens, EFFL is a focal length of the projection optical system, and TTL is a total length of the projection optical system.
11. The projection optical system according to claim 8, wherein the projection optical system satisfies the following relationship: vd5 is less than or equal to 40, Vd7 is less than or equal to 40, Vd10 is less than or equal to 40, and Vd2 is less than or equal to 40;
wherein the Vd5 denotes an abbe number of the fifth lens, the Vd7 denotes an abbe number of the seventh lens, the Vd10 denotes an abbe number of the tenth lens, and the Vd2 denotes an abbe number of the second lens.
12. The projection optical system according to claim 8, wherein the projection optical system satisfies the following relationship: vd6 is more than or equal to 55, Vd8 is more than or equal to 55, Vd9 is more than or equal to 55, Vd1 is more than or equal to 55, Vd3 is more than or equal to 55, Vd4 is more than or equal to 55, Vd11 is more than or equal to 55, and Vd12 is more than or equal to 55;
wherein the Vd6 denotes an abbe number of the sixth lens, the Vd8 denotes an abbe number of the eighth lens, the Vd9 denotes an abbe number of the ninth lens, the Vd1 denotes an abbe number of the first lens, the Vd3 denotes an abbe number of the third lens, the Vd4 denotes an abbe number of the fourth lens, the Vd11 denotes an abbe number of the eleventh lens, and the Vd12 denotes an abbe number of the twelfth lens.
13. A projection apparatus comprising a housing and the projection optical system according to any one of claims 1 to 12, the projection optical system being housed in the housing.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114924381A (en) * | 2022-04-29 | 2022-08-19 | 歌尔光学科技有限公司 | Projection lens and electronic equipment |
| TWI809587B (en) * | 2021-12-07 | 2023-07-21 | 揚明光學股份有限公司 | Projection lens |
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| US4560243A (en) * | 1983-06-30 | 1985-12-24 | Nippon Kogaku K.K. | Projection lens |
| US20090257117A1 (en) * | 2008-04-09 | 2009-10-15 | Tomoyuki Baba | Projection optical system and projection type display using the same |
| CN106842590A (en) * | 2017-03-28 | 2017-06-13 | 中山联合光电科技股份有限公司 | A kind of ultrashort out-of-focus projection's optical system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4560243A (en) * | 1983-06-30 | 1985-12-24 | Nippon Kogaku K.K. | Projection lens |
| US20090257117A1 (en) * | 2008-04-09 | 2009-10-15 | Tomoyuki Baba | Projection optical system and projection type display using the same |
| CN106842590A (en) * | 2017-03-28 | 2017-06-13 | 中山联合光电科技股份有限公司 | A kind of ultrashort out-of-focus projection's optical system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI809587B (en) * | 2021-12-07 | 2023-07-21 | 揚明光學股份有限公司 | Projection lens |
| CN114924381A (en) * | 2022-04-29 | 2022-08-19 | 歌尔光学科技有限公司 | Projection lens and electronic equipment |
| CN114924381B (en) * | 2022-04-29 | 2023-11-14 | 歌尔光学科技有限公司 | Projection lens and electronic equipment |
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