CN116774409B

CN116774409B - Projection lens and lamp

Info

Publication number: CN116774409B
Application number: CN202311079914.7A
Authority: CN
Inventors: 莫怀友
Original assignee: Shenzhen Aitushi Innovation Technology Co ltd
Current assignee: Shenzhen Aitushi Innovation Technology Co ltd
Priority date: 2023-08-25
Filing date: 2023-08-25
Publication date: 2023-10-17
Anticipated expiration: 2043-08-25
Also published as: CN116774409A

Abstract

The application discloses a projection lens and a lamp, wherein the projection lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object direction image side and are arranged in a common optical axis manner, and the projection lens has a focal length range of 145 mm-155 mm, so that the projection lens can have a larger emergent view angle, and an image imaged by the projection lens is high in definition and imaging quality; meanwhile, compared with the existing projection lens, the projection lens has less lenses, is beneficial to simplifying the structure of the projection lens and reducing the production cost of the projection lens.

Description

Projection lens and lamp

Technical Field

The present disclosure relates to lighting devices, and particularly to a projection lens and a lighting device.

Background

Projection lighting lenses are often used in the fields of photographic lighting, stage lighting, and the like. Generally, a shaping condensing device is used to condense light emitted by a photographic lighting lamp or a stage lamp into a light spot small enough, and then the light spot is projected onto a illuminated surface by a projection device. In some cases, it is also desirable to place the pattern piece at the spot location so that the spot illuminates the pattern piece to project the pattern piece onto the illuminated surface.

In the related art, because stage lamps or photographic lighting fixtures use an extended light source with higher brightness and large light emitting area, the formed light spot area is larger; however, the object height and the light-emitting field angle of the conventional projection lens are small, so that it is difficult to clearly project a large-area light spot or pattern onto the illuminated surface.

Therefore, how to solve the problem that the imaging capability of the projection lens is poor for a large-area object image is a problem which needs to be solved at present.

Disclosure of Invention

The application aims to provide a projection lens and a lamp, which are used for solving the problem that the imaging capability of the projection lens is poor for a large-area object image.

The application adopts the following scheme for solving the technical problems.

In a first aspect, the present application provides a projection lens, which has an object side and an image side, wherein the projection lens includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from the object side to the image side and have a common optical axis, the first lens, the fourth lens and the fifth lens are positive lenses, the second lens and the third lens are negative lenses, and the focal length of the projection lens is 145 mm-155 mm.

In some embodiments of the present application, the focal length range of the projection lens is 151.034mm.

In some embodiments of the present application, the first lens is a plano-convex lens, and the first lens includes a first plane and a first convex surface, the first plane being disposed near the object space, the first convex surface being disposed near the second lens;

the second lens is a meniscus lens, and comprises a second convex surface and a first concave surface, wherein the second convex surface is close to the first lens, and the first concave surface is close to the third lens;

the third lens is a meniscus lens, the third lens comprises a second concave surface and a third convex surface, the second concave surface is close to the second lens, and the third convex surface is close to the fourth lens;

the fourth lens is a meniscus lens, the fourth lens comprises a third concave surface and a fourth convex surface, the third concave surface is close to the third lens, and the fourth convex surface is close to the fifth lens;

the fifth lens is a plano-convex lens, the fifth lens comprises a second plane and a fifth convex surface, the second plane is close to the fourth lens, and the fifth convex surface is close to the image space.

In some embodiments of the present application, a distance from the first convex surface to the second convex surface along a path along which the optical axis is located is 46.432mm, a distance from the first concave surface to the second concave surface is 21.661mm, a distance from the third convex surface to the third concave surface is 7.793mm, and a distance from the fourth convex surface to the second plane is 2.180mm.

In some embodiments of the application, the radius of curvature of the second convex surface is greater than the radius of curvature of the first concave surface.

In some embodiments of the application, the radius of curvature of the second concave surface is smaller than the radius of curvature of the third convex surface.

In some embodiments of the present application, the third concave surface has a smaller radius of curvature than the fourth convex surface.

In some embodiments of the present application, the first lens has an optical power fa1, and the optical power of the first lens satisfies: 0.01001 fa1 is less than 0.010014;

the focal power of the second lens is fa2, and the focal power of the second lens meets the following conditions: -0.00245 < fa2 < -0.00241;

the focal power of the third lens is fa3, and the focal power of the third lens meets the following conditions: -0.01881 < fa3 < -0.01877;

the focal power of the fourth lens is fa4, and the focal power of the fourth lens meets the following conditions: 0.0043434 fa4 is less than 0.0043438;

the focal power of the fifth lens is fa5, and the focal power of the fifth lens meets the following conditions: 0.00754 fa5 0.00758.

In some embodiments of the application, the first lens has an optical power of: fa1= 0.010012; the focal power of the second lens is as follows: fa2= -0.00243; the focal power of the third lens is as follows: fa3= -0.01879; the focal power of the fourth lens is as follows: fa4= 0.0043436; the focal power of the fifth lens is as follows: fa5= 0.00756.

In some embodiments of the application, the diameter of the third lens is greater than the diameter of the second lens;

and/or the diameter of the fourth lens is larger than the diameter of the third lens;

and/or, the diameter of the fifth lens is larger than the diameter of the fourth lens.

In some embodiments of the present application, the maximum object height of the projection lens is y, where the maximum object height of the projection lens satisfies: y is more than 25mm and less than 26mm; the light-emitting field angle of the projection lens is w, and the light-emitting field angle of the projection lens meets the following conditions: w is less than 20 DEG and 18 DEG.

In some embodiments of the present application, the maximum object height of the projection lens is: y=25.5mm, the angle of field of light output of the projection lens is: w=19°.

In a second aspect, the application further provides a lamp, which comprises the projection lens.

The application provides a projection lens and a lamp, wherein the projection lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object direction image side and are arranged in a common optical axis manner, the projection lens has a focal length range of 145 mm-155 mm, even if the object height is 25 mm-30 mm, the projection lens can have a larger emergent view angle, and the image imaged by the projection lens has high definition and high imaging quality; meanwhile, compared with the existing projection lens, the projection lens has less lenses, is beneficial to simplifying the structure of the projection lens and reducing the production cost of the projection lens.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a projection lens according to an embodiment of the application;

FIG. 2 is a schematic diagram illustrating an optical path layout of a projection lens according to an embodiment of the present application;

FIG. 3 is a first distortion chart of a projection lens according to an embodiment of the present application;

FIG. 4 is a first point diagram of a projection lens according to an embodiment of the present application;

fig. 5 is a schematic view illustrating a first spot uniformity of a projection lens according to an embodiment of the application;

FIG. 6 is a first MTF diagram of a projection lens according to an embodiment of the present application;

FIG. 7 is a second distortion chart of a projection lens according to an embodiment of the present application;

FIG. 8 is a second dot matrix of the projection lens according to an embodiment of the present application;

FIG. 9 is a schematic diagram illustrating a second spot uniformity of a projection lens according to an embodiment of the present application;

fig. 10 is a second MTF diagram of a projection lens according to an embodiment of the present application.

Description of main reference numerals:

100-projection lens, 110-first lens, 120-second lens, 130-third lens, 140-fourth lens, 150-fifth lens, 200-object-side, 300-image-side.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application. In the description of the present application, the meaning of "plurality" is two or more, unless explicitly defined otherwise.

In the present application, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described as exemplary in this disclosure is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for purposes of explanation. It will be understood by those of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes have not been shown in detail to avoid unnecessarily obscuring the description of the application. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles disclosed herein.

Current projection lenses are mainly used to project a spot or an image at a spot onto a stage or other projection surface. The light spots are formed by converging the stage lamps or photographic lighting lamps through the shaping condensing device. And the pattern piece can be placed at the spot forming position, so that the spot and the pattern piece are overlapped, and an image is formed at the light plate.

Stage or photographic lighting lamps typically require the use of a relatively high intensity extended light source having a relatively large light emitting area. Even the light beam converged by the shaping and condensing device still forms larger light spots or images, so that the object height of the projection lens is required to be large enough, and the aperture of the lens in the projection lens is also required to be larger. For example, a photographic lighting lamp often adopts a high-power LED integrated light source, the light emitting area is larger, the light spots formed by converging after being shaped and condensed by a light condensing device are larger, but the imaging capability of the current projection lens for the light spots with larger area is poorer.

The application is based on the improvement of the current projection lens and lamp.

First, referring to fig. 1, fig. 1 shows a projection lens 100 according to an embodiment of the application, where the projection lens 100 has an object side 200 and an image side 300. From the object side 200 to the image side 300, the projection lens 100 includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, and a fifth lens 150 arranged along the optical axis direction. The first lens 110, the fourth lens 140, and the fifth lens 150 are positive lenses, and the second lens 120 and the third lens 130 are negative lenses.

It should be noted that the object 200 refers to a spot or a position where an image is formed. That is, the light source may form a light spot at the object 200 through the shaping condensing device; it will be appreciated that a pattern piece is provided on the object 200, and a spot of light is irradiated onto the pattern piece, and the pattern piece is illuminated to form an image.

Specifically, the optical axis is formed by connecting the center points of the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, and the fifth lens 150 one by one. The optical axis direction is the direction from the center point of the object side 200 to the image side 300, where the light passes through the center points of the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140 and the fifth lens element 150 in sequence.

It should be noted that the positive lens is a lens with a thick middle and a thin periphery, and has a light condensing capability. A negative lens is a thin middle, thick edge lens with the ability to diverge light. The first lens 110, the fourth lens 140, and the fifth lens 150 all have a light condensing capability. Both the second lens 120 and the third lens 130 have the ability to diverge light.

The first lens 110 is disposed close to the object side 200. That is, the light emitted from the object 200 passes through the first lens 110, and the light is converged by the first lens 110 before reaching the second lens 120. The fifth lens 150 is disposed close to the image side 300. That is, the light emitted by the fourth lens 140 passes through the fifth lens 150, and is converged by the fifth lens 150 before being emitted to the image side 300.

The focal length of the projection lens 100 ranges from 145mm to 155mm. It should be noted that, the focal length of the projection lens 100 refers to the focal length of the entire lens group of the projection lens 100.

The current projection lens 100 faces a large area spot, and its imaging effect is poor. However, the projection lens 100 of the present application has a focal length range of 145mm to 155mm, and even if the object height is 25mm to 30mm, the projection lens 100 can have a larger light-emitting field angle, and the image imaged by the projection lens 100 has high definition and high imaging quality; meanwhile, compared with the existing projection lens 100, the projection lens 100 has less lenses, is beneficial to simplifying the structure of the projection lens 100 and reducing the production cost of the projection lens 100.

In some embodiments of the present application, referring to fig. 1, the first lens 110 is a plano-convex lens, and the first lens 110 includes a first plane and a first convex surface, wherein the first plane is disposed near the object side 200, and the first convex surface is disposed near the second lens 120. It should be explained that in the direction of the optical axis, the radius of the lens surface is characterized by a negative value for the center of the circle of the lens surface on the left and a positive value for the radius of the lens surface on the right. Thus, the radius of the first convex surface is a positive value.

The second lens 120 is a meniscus lens, and the second lens 120 includes a second convex surface disposed near the first lens 110 and a first concave surface disposed near the third lens 130. That is, the radius of the second convex surface is a positive value, and the radius of the first concave surface is a positive value. In some embodiments, the radius of the second convex surface is greater than the radius of the first concave surface.

The third lens 130 is a meniscus lens, the third lens 130 includes a second concave surface disposed close to the second lens 120 and a third convex surface disposed close to the fourth lens 140. That is, the radius of the second concave surface is negative, and the radius of the third convex surface is negative. In some embodiments, the absolute value of the second concave radius is less than the absolute value of the third convex radius.

The fourth lens 140 is a meniscus lens, the fourth lens 140 includes a third concave surface disposed close to the third lens 130 and a fourth convex surface disposed close to the fifth lens 150. That is, the radius of the third concave surface is negative, and the radius of the fourth concave surface is negative. And the absolute value of the third concave radius is smaller than the absolute value of the fourth convex radius.

The fifth lens 150 is a plano-convex lens, and the fifth lens 150 includes a second plane and a fifth convex surface, the second plane being disposed near the fourth lens 140, and the fifth convex surface being disposed near the image side 300. That is, the radius of the fifth concave surface is a negative value.

It is understood that positive lenses include plano-convex lenses, meniscus lenses (meniscus lenses), biconvex lenses, and the like; the meniscus lens convexity in the positive lens is greater than concavity. Negative lenses include meniscus lenses (convex-concave lenses), biconcave lenses, and plano-concave lenses, with the meniscus lens convexity being greater than concavity in the negative lenses.

In some embodiments of the application, the radius of curvature of the second convex surface is greater than the radius of curvature of the first concave surface. And/or the radius of curvature of the second concave surface is smaller than the radius of curvature of the third convex surface. And/or the radius of curvature of the third concave surface is smaller than the radius of curvature of the fourth convex surface.

In some embodiments of the present application, the optical power of the first lens 110 is fa1, and the optical power of the first lens 110 satisfies: 0.01001 fa1 is less than 0.010014; the optical power of the second lens 120 is fa2, and the optical power of the second lens 120 satisfies: -0.00245 < fa2 < -0.00241; the optical power of the third lens 130 is fa3, and the optical power of the third lens 130 satisfies: -0.01881 < fa3 < -0.01877; the optical power of the fourth lens 140 is fa4, and the optical power of the fourth lens 140 satisfies: 0.0043434 fa4 is less than 0.0043438; the optical power of the fifth lens 150 is fa5, and the optical power of the fifth lens 150 satisfies: 0.00754 fa5 0.00758.

Specifically, the optical power (focalpower) is equal to the difference between the image Fang Guangshu convergence and the object beam convergence, which characterizes the optical power of the optical system's ability to deflect light. And a positive value of the focal power indicates that the lens has the function of converging light, and a negative value indicates that the lens has the function of diffusing light.

In some embodiments of the present application, the diameter of the third lens 130 is greater than the diameter of the second lens 120; and/or, the diameter of the fourth lens 140 is greater than the diameter of the third lens 130; and/or the diameter of the fifth lens 150 is larger than the diameter of the fourth lens 140. It should be explained that the diameter of the lens is the diameter of the outer contour shape of the transmissive portion of the lens.

In some embodiments of the present application, the maximum object height of the projection lens 100 is y, and the maximum object height of the projection lens 100 satisfies: y is more than 25mm and less than 26mm; the light emission angle of the projection lens 100 is w, and the light emission angle of the projection lens 100 satisfies: w is less than 20 DEG and 18 DEG.

In some embodiments of the present application, the aperture of the projection lens 100 is of the object-side cone angle type, and the maximum value of the object-side cone angle is 28 °, and the main optical axis of the system are parallel at any point on the projection object under the object-side cone angle condition.

Referring to fig. 1, fig. 2, and table 1, fig. 2 is a schematic diagram of an optical path layout of a projection lens 100 according to an embodiment of the present application, and table 1 is a physical parameter table of the projection lens 100 according to an embodiment of the present application.

As shown in fig. 1 and table 1, the surface numbers of the object side 200 position are set to 0, the surface numbers of the first plane, the first convex surface, the second convex surface, the first concave surface, the second concave surface, the third convex surface, the third concave surface, the fourth convex surface, the second plane, and the fifth convex surface are set to 1 to 10 in this order, and the surface numbers of the transmission side position are set to 11.r is the radius of curvature (in mm) of the corresponding surface; d is a distance (in mm) between the corresponding surface and the next surface in the optical axis direction; nd is the refractive index of the component under d-ray conditions; specifically, the d ray is a green ray, and the wavelength of the green ray is 587.56nm.

vd is the abbe number of the material of the optical member with reference to d-ray. The Abbe number is calculated as:

vd= (nd-1)/(nf-nc); wherein nf is the refractive index of the component under f-ray conditions, and the refractive index of the surface under f-ray conditions, specifically, f-ray is red-ray, and the wavelength of the red-ray is 486.13nm. nc is the refractive index of the component under c-ray conditions, and the refractive index of the surface under c-ray conditions, specifically, f-ray is blue ray, and the wavelength of the blue ray is 656.27nm.

LW is the object working distance, i.e., the linear distance from the object plane of the projected object to the first plane. LX is the back working distance, i.e. the linear distance between the fifth convex vertex and the projection plane. y is the half-caliber of the object image at the object plane, and y' is the half-caliber of the projection at the image plane (projection plane).

The method comprises the following steps: the refractive index of the first lens 110 is 1.6204 and the abbe number is 60.37. The first lens 110 includes a first plane and a first convex surface, a distance from the first plane to an apex of the first convex surface is 14.611mm along a path along which an optical axis is located, half calibers of the first plane and the first convex surface are 37.5mm, and a radius of curvature of the first convex surface is-61.969 mm.

The refractive index of the second lens 120 is 1.5168 and the abbe number is 64.21. The second lens 120 includes a second convex surface and a first concave surface, and a distance from the first convex surface to the second convex surface along a path along which the optical axis is located is 46.432mm, and a distance from the second convex surface to the first concave surface is 6.000mm. The curvature radius of the second convex surface is 65.900mm, and the half caliber of the second convex surface is 26.0mm; the radius of curvature of the first concave surface is 48.750mm, and the half caliber of the first concave surface is 24.4mm.

The refractive index of the third lens 130 is 1.6727 and the abbe number is 32.18. The third lens 130 includes a second concave surface and a third convex surface, and a distance from the first concave surface to the second concave surface along a path along which the optical axis is located is 21.661mm, and a distance from the second concave surface to the third convex surface is 3.000mm. The radius of curvature of the second concave surface is-30.490 mm, and the half caliber of the second concave surface is 24.3mm. The radius of curvature of the third convex surface is-131.650 mm, and the half caliber of the third convex surface is 29.0mm.

The refractive index of the fourth lens 140 is 1.6204 and the abbe number is 60.37. The fourth lens 140 includes a third concave surface and a fourth convex surface, wherein a distance from the third convex surface to the third concave surface along a path along which the optical axis is located is 7.793mm, and a distance from the third concave surface to the fourth convex surface is 13.540mm. The radius of curvature of the third concave surface is-77.600 mm, and the half caliber of the third concave surface is 32.0mm. The radius of curvature of the fourth convex surface is-42.550 mm, and the half caliber of the fourth convex surface is 34.5mm.

The refractive index of the fifth lens 150 is 1.6204 and the abbe number is 60.37. The fifth lens 150 includes a second plane and a fifth convex surface, and a distance from the fourth convex surface to the second plane along a path along which the optical axis is located is 2.180mm, and a distance from the second plane to the fifth convex surface is 15.350mm. The half caliber of the second plane is 39.8mm. The radius of curvature of the fifth convex surface is-74.230 mm, and the half caliber of the fifth convex surface is 41.0mm.

TABLE 1

More specifically, in the present embodiment, the focal length of the projection lens 100 is 151.034mm. The optical power of the first lens 110 is: fa1= 0.010012; the optical power of the second lens 120 is: fa2= -0.00243; the third lens 130 has an optical power of: fa3= -0.01879; the fourth lens 140 has optical power of: fa4= 0.0043436; the optical power of the fifth lens 150 is: fa5= 0.00756. The maximum object height of the projection lens 100 is: y=25.5 mm, and the light-emitting field angle of the projection lens 100 is: w=19°.

In one embodiment, referring to fig. 3 to 6, fig. 3 shows a first distortion chart of the projection lens 100 in the present embodiment, fig. 4 shows a first spot diagram of the projection lens 100 in the present embodiment, fig. 5 shows a first spot uniformity diagram of the projection lens 100 in the present embodiment, and fig. 6 shows a first MTF diagram of the projection lens 100 in the present embodiment. Lw=43.788 mm and lx=2000 mm in this embodiment, at which point the object image can be clearly transmitted to the image side. Y' =352.4mm in this example, w=19°. As shown in fig. 3, the system produces maximum distortion, and distortion is less than 5%, with little distortion. As shown in FIG. 4, the maximum speckle radius RMS of the image space is smaller than 1.7mm, the imaging quality is good, and the projection requirement of the hole-shaped projection object can be well met. As shown in fig. 5, the system spot uniformity is greater than 70%. As shown in FIG. 6, at a spatial frequency of 0.2mm, most of the field of view MTF >0.7, the contrast and contrast are higher, the contrast is higher, and the lens performs better at full aperture.

In another embodiment, referring to fig. 7 to 10, fig. 7 shows a second distortion chart of the projection lens 100 in the present embodiment, fig. 8 shows a second point column chart of the projection lens 100 in the present embodiment, fig. 9 shows a second spot uniformity diagram of the projection lens 100 in the present embodiment, and fig. 10 shows a second MTF chart of the projection lens 100 in the present embodiment. Lw=37.242 mm in this embodiment, lx=5000 mm, at which point the object image can be clearly transmitted to the image aspect. Y' = 861.7mm in this example. As shown in fig. 7, the system produces maximum distortion, and distortion is less than 4%, with little distortion. As shown in FIG. 8, the maximum speckle radius RMS of the image space is smaller than 3.8mm, the imaging quality is good, and the projection requirement of the hole-shaped projection object can be well met. As shown in fig. 9, the system spot uniformity is greater than 80%. As shown in FIG. 10, at a spatial frequency of 0.1mm, most of the field of view MTF >0.5, the contrast and contrast are higher, the contrast is higher, and the lens performs better at full aperture.

In yet another embodiment, lw=33.706 mm and lx=25000 mm in this embodiment, where the object image can be clearly transmitted to the image aspect. Y' = 4292.5mm in this example. The system generates maximum distortion, the distortion is less than 4%, and the distortion is small. The maximum diffuse spot radius RMS diameter of the image space is smaller than 28mm, the imaging quality is good, and the projection requirement of the hole-shaped projection object can be well met. The uniformity of the system light spots is more than 85 percent. At a spatial frequency of 0.01mm, most of the field of view MTF >0.6, the contrast and contrast are higher, the contrast is higher, and the lens performs better at full aperture.

Further, in order to better implement the projection lens 100 according to the embodiment of the present application, on the basis of the projection lens 100, the present application further provides a lamp, which includes the projection lens 100 according to any one of the embodiments described above.

In some embodiments, the luminaire includes a housing, and the projection lens 100 is disposed within the housing.

In the foregoing embodiments, the descriptions of the embodiments are focused on, and the portions of one embodiment that are not described in detail in the foregoing embodiments may be referred to in the foregoing detailed description of other embodiments, which are not described herein again.

While the basic concepts have been described above, it will be apparent to those skilled in the art that the foregoing detailed disclosure is by way of example only and is not intended to be limiting. Although not explicitly described herein, various modifications, improvements and adaptations of the application may occur to one skilled in the art. Such modifications, improvements, and modifications are intended to be suggested within the present disclosure, and therefore, such modifications, improvements, and adaptations are intended to be within the spirit and scope of the exemplary embodiments of the present disclosure.

Meanwhile, the present application uses specific words to describe embodiments of the present application. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the application. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the application may be combined as suitable.

Similarly, it should be noted that in order to simplify the description of the present disclosure and thereby aid in understanding one or more inventive embodiments, various features are sometimes grouped together in a single embodiment, figure, or description thereof. This method of disclosure, however, is not intended to imply that more features than are required by the subject application. Indeed, less than all of the features of a single embodiment disclosed above.

Accordingly, in some embodiments, numerical parameters set forth in the specification and claims are approximations that may vary depending upon the desired properties sought to be obtained by the individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and employ a method for preserving the general number of digits. Although the numerical ranges and parameters set forth herein are approximations in some embodiments for use in determining the breadth of the range, in particular embodiments, the numerical values set forth herein are as precisely as possible.

Each patent, patent application publication, and other material, such as articles, books, specifications, publications, documents, etc., cited herein is hereby incorporated by reference in its entirety except for any application history file that is inconsistent or otherwise conflict with the present disclosure, which places the broadest scope of the claims in this application (whether presently or after it is attached to this application). It is noted that the description, definition, and/or use of the term in the appended claims controls the description, definition, and/or use of the term in this application if the description, definition, and/or use of the term in the appended claims does not conform to or conflict with the present disclosure.

The foregoing has outlined the detailed description of the embodiments of the present application, and the detailed description of the principles and embodiments of the present application is provided herein by way of example only to facilitate the understanding of the method and core concepts of the present application; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the ideas of the present application, the present description should not be construed as limiting the present application in summary.

Claims

1. A projection lens having an object side (200) and an image side (300), wherein the projection lens (100) comprises a first lens (110), a second lens (120), a third lens (130), a fourth lens (140) and a fifth lens (150) which are sequentially arranged from the object side (200) to the image side (300) and share an optical axis, wherein the first lens (110), the fourth lens (140) and the fifth lens (150) are positive lenses, the second lens (120) and the third lens (130) are negative lenses, and the focal length range of the projection lens (100) is 145 mm-155 mm; the number of lenses with focal power in the projection lens is 5;

the optical power fa1 of the first lens (110) satisfies: 0.01001 diopters < fa1 < 0.010014 diopters;

the optical power fa2 of the second lens (120) satisfies: -0.00245 diopters < fa2 < -0.00241 diopters;

the optical power fa3 of the third lens (130) satisfies: -0.01881 diopters < fa3 < -0.01877 diopters;

the optical power fa4 of the fourth lens (140) satisfies: 0.0043434 diopters < fa4 < 0.0043438 diopters;

the optical power fa5 of the fifth lens (150) satisfies: 0.00754 diopters < fa5 < 0.00758 diopters.

2. The projection lens according to claim 1, characterized in that the focal length of the projection lens (100) is 151.034mm.

3. The projection lens according to claim 1, wherein the first lens (110) is a plano-convex lens, the first lens (110) comprising a first plane and a first convex surface, the first plane being arranged close to the object space (200), the first convex surface being arranged close to the second lens (120); the second lens (120) is a meniscus lens, the second lens (120) comprises a second convex surface and a first concave surface, the second convex surface is arranged close to the first lens (110), and the first concave surface is arranged close to the third lens (130);

the third lens (130) is a meniscus lens, the third lens (130) comprises a second concave surface and a third convex surface, the second concave surface is arranged close to the second lens (120), and the third convex surface is arranged close to the fourth lens (140);

the fourth lens (140) is a meniscus lens, the fourth lens (140) comprises a third concave surface and a fourth convex surface, the third concave surface is arranged close to the third lens (130), and the fourth convex surface is arranged close to the fifth lens (150);

the fifth lens (150) is a plano-convex lens, the fifth lens (150) includes a second plane and a fifth convex surface, the second plane is disposed near the fourth lens (140), and the fifth convex surface is disposed near the image space (300).

4. A projection lens according to claim 3, wherein the distance from the first convex surface to the second convex surface along the path of the optical axis is 46.432mm, the distance from the first concave surface to the second concave surface is 21.661mm, the distance from the third convex surface to the third concave surface is 7.793mm, and the distance from the fourth convex surface to the second plane is 2.180mm.

5. A projection lens according to claim 3, wherein the radius of curvature of the second convex surface is greater than the radius of curvature of the first concave surface;

and/or the absolute value of the curvature radius of the second concave surface is smaller than the absolute value of the curvature radius of the third convex surface;

and/or, the radius of curvature of the third concave surface is smaller than the radius of curvature of the fourth convex surface.

6. The projection lens according to claim 1, characterized in that the optical power fa1= 0.010012 diopters of the first lens (110); -optical power fa2= -0.00243 diopters of the second lens (120); -optical power fa3= -0.01879 diopters of the third lens (130); the optical power fa4= 0.0043436 diopters of the fourth lens (140); the optical power fa5= 0.00756 diopters of the fifth lens (150).

7. The projection lens of claim 1, wherein the diameter of the third lens (130) is larger than the diameter of the second lens (120);

and/or the diameter of the fourth lens (140) is larger than the diameter of the third lens (130);

and/or the diameter of the fifth lens (150) is larger than the diameter of the fourth lens (140).

8. Projection lens according to claim 1, characterized in that the maximum object height y of the projection lens (100) satisfies: y is more than 25mm and less than 26mm; the light-emitting field angle w of the projection lens (100) satisfies: w is less than 20 DEG and 18 DEG.

9. A luminaire characterized by comprising a projection lens (100) as claimed in any one of claims 1 to 8.