CN220399724U - Projection lens and lamp - Google Patents

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 and are arranged on a common optical axis, wherein the focal power of the first lens, the focal power of the fourth lens and the focal power of the fifth lens are all larger than 0, the focal power of the second lens and the focal power of the third lens are all smaller than 0, and the range of the system focal length of the projection lens is 250-260 mm, so that the projection lens can have a larger emergent field angle, and the image formed by the projection lens is high in definition and imaging quality; meanwhile, compared with the existing projection lens, the number of lenses is smaller, the structure of the projection lens is simplified, and the production cost of the projection lens is reduced.

Description

Projection lens and lamp

Technical Field

The application relates to the technical field of lamp illumination, in particular to a projection lens and a lamp.

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, so as to solve the problem that the imaging capability of the projection lens is poor for a large-area object image.

The following schemes are adopted to solve the technical problems.

In a first aspect, the present application provides a projection lens, having an object space and an image space, from the object space the image space the projection lens includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged and share an optical axis, wherein, the focal power of the first lens, the fourth lens and the fifth lens is all greater than 0, the focal power of the second lens and the third lens is all less than 0, and the range of the system focal length of the projection lens is 250 mm-260 mm.

In some embodiments of the present application, the optical power fa1 of the first lens satisfies: fa1 is more than 0.006 and less than 0.00602; the optical power fa2 of the second lens satisfies: -0.001455 < fa2 < -0.00145; the third lens has an optical power fa3 that satisfies: -0.0117 < fa3 < -0.011696; the fourth lens has the focal power fa4 as follows: 0.004325 fa4 is less than 0.00433; the focal power of the fifth lens is fa5 focal power which satisfies the following conditions: 0.00521 fa5 0.005215.

In some embodiments of the present application, the optical power of the first lens is: fa1= 0.00601; the focal power of the second lens is as follows: fa2= -0.001453; the focal power of the third lens is as follows: fa3= -0.011698; the focal power of the fourth lens is as follows: fa4= 0.004327; the focal power of the fifth lens is as follows: fa5= 0.005214. 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, where the first plane is disposed near the object space, and the first convex surface is 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, along a path along which an optical axis is located, a distance from the first convex surface to the second convex surface is 79.131mm, a distance from the first concave surface to the second concave surface is 34.019mm, a distance from the third convex surface to the third concave surface is 12.567mm, and a distance from the fourth convex surface to the second plane is 1.500mm.

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

In some embodiments of the present application, the second concave surface has a smaller radius of curvature than 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 maximum object height of the projection lens is y, where the maximum object height of the projection lens satisfies: 42mm < y < 43mm; 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 focal length range of the projection lens is 255.275mm.

In some embodiments of the present application, the diameter of the third lens is equal to 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=42.5mm, the angle of field of light output of the projection lens is: w=19°.

In a second aspect, the present application further provides a lamp, including the above projection lens.

The projection lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged and are arranged on a common optical axis, wherein the focal power of the first lens, the focal power of the fourth lens and the focal power of the fifth lens are all larger than 0, the focal power of the second lens and the focal power of the third lens are all smaller than 0, the range of the focal length of the system of the projection lens is 250-260 mm, and therefore, even under the condition that the object height is 40-45mm, the projection lens can have a larger emergent view angle, and the image definition imaged by the projection lens is high, and the imaging quality is high; meanwhile, compared with the existing projection lens, the number of lenses is smaller, the structure of the projection lens is simplified, and the production cost of the projection lens is reduced.

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 introduced 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 present disclosure;

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

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

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

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

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

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

FIG. 8 is a second point diagram of a projection lens according to an embodiment of the present disclosure;

fig. 9 is a schematic diagram of second spot uniformity of a projection lens according to an embodiment of the present disclosure;

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 fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. Based on the embodiments herein, all other embodiments that a person skilled in the art would obtain without making any inventive effort are within the scope of protection of the present application. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In this application, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as exemplary 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 apparent to one 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 obscuring the description of the present application with unnecessary detail. 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 present application is based on this improvement over current projection lenses and luminaires.

First, referring to fig. 1, fig. 1 shows a projection lens 100 provided in an embodiment of the present application, where the projection lens 100 has an object side 200 and an 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, which are sequentially arranged along an optical axis direction from an object side 200 to an image side 300. In some embodiments, the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, and the fifth lens 150 are disposed coaxially. The first lens 110, the fourth lens 140 and the fifth lens 150 have optical powers greater than 0, i.e., the first lens 110, the fourth lens 140 and the fifth lens 150 are positive lenses. The optical powers of the second lens 120 and the third lens 130 are both smaller than 0, i.e., the second lens 120 and the third lens 130 are both 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 system focal length of the projection lens 100 ranges from 250mm to 260mm. It should be noted that, the system 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 system focal length range of 250mm to 260mm, even in the case of an object height of 40 to 45mm, the projection lens 100 can have a large light-emitting field angle, and the image imaged by the projection lens 100 is high in definition and 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, please continue to refer to fig. 1, the first lens 110 is a plano-convex lens, the first lens 110 includes a first plane and a first convex surface, 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 present 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: fa1 is more than 0.006 and less than 0.00602; the optical power of the second lens 120 is fa2, and the optical power of the second lens 120 satisfies: -0.001455 < fa2 < -0.00145; the optical power of the third lens 130 is fa3, and the optical power of the third lens 130 satisfies: -0.0117 < fa3 < -0.011696; the optical power of the fourth lens 140 is fa4, and the optical power of the fourth lens 140 satisfies: 0.004325 fa4 is less than 0.00433; the optical power of the fifth lens 150 is fa5, and the optical power of the fifth lens 150 satisfies: 0.00521 fa5 0.005215.

Specifically, the optical power (focal power), which is equal to the difference between the image Fang Guangshu convergence and the object beam convergence, 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 equal to 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 noted that the diameter of the lens refers to the diameter of the outer contour shape formed by 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: 42mm < y < 43mm; 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, 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, the distance from the first plane to the vertex of the first convex surface is 24.351mm, the half calibers of the first plane and the first convex surface are 63.0mm, and the curvature radius of the first convex surface is-103.281 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 79.131mm, and a distance from the second convex surface to the first concave surface is 10.000mm. The curvature radius of the second convex surface is 110.017mm, and the half caliber of the second convex surface is 50.0mm; the radius of curvature of the first concave surface is 81.426mm, and the half caliber of the first concave surface is 42.0mm.

The refractive index of the third lens 130 is 1.7552 and the abbe number is 27.55. 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 34.019mm, and a distance from the second concave surface to the third convex surface is 7.000mm. The radius of curvature of the second concave surface is-50.600 mm, and the half caliber of the second concave surface is 42.0mm. The radius of curvature of the third convex surface is-248.000 mm, and the half caliber of the third convex surface is 50.0mm.

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 12.567mm, and a distance from the third concave surface to the fourth convex surface is 23.000mm. The radius of curvature of the third concave surface is-130.000 mm, and the half caliber of the third concave surface is 54.0mm. The radius of curvature of the fourth convex surface is-72.800 mm, and the half caliber of the fourth convex surface is 59.0mm.

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 1.500mm, and a distance from the second plane to the fifth convex surface is 26.000mm. The half caliber of the second plane is 68.0mm. The radius of curvature of the fifth convex surface is-119.000 mm, and the half caliber of the fifth convex surface is 68.0mm.

TABLE 1

Face number n	Surface type	r	d	nd	vd	Semi-caliber
							0 (object plane)	Spherical surface	Infinite number of cases	Lw			y
1 (aperture)	Spherical surface	Infinite number of cases	24.351	1.6204	60.37	63.0
							2	Spherical surface	-103.281	79.131			63.0
3	Spherical surface	110.017	10.000	1.5168	64.21	50.0
							4	Spherical surface	81.426	34.019			42.0
5	Spherical surface	-50.600	7.000	1.7552	27.55	42.0
							6	Spherical surface	-248.000	12.567			50.0
7	Spherical surface	-130.000	23.000	1.6204	60.37	54.0
							8	Spherical surface	-72.800	1.500			59.0
9	Spherical surface	Infinite number of cases	26.000	1.6204	60.37	68.0
							10	Spherical surface	-119.000	LX			68.0
11 (image plane)	Spherical surface	Infinite number of cases	0.000			y

More specifically, in the present embodiment, the focal length of the projection lens 100 is 255.275mm. The optical power of the first lens 110 is: fa1= 0.00601; the optical power of the second lens 120 is: fa2= -0.001453; the third lens 130 has an optical power of: fa3= -0.011698; the fourth lens 140 has optical power of: fa4= 0.004327; the optical power of the fifth lens 150 is: fa5= 0.005214. The maximum object height of the projection lens 100 is: y=42.5 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=82.2 mm in this embodiment, lx=2500 mm, at which point the object image can be clearly transmitted to the image aspect. Y' =451 mm, w=19° in this example. As shown in fig. 3, the system produces maximum distortion, and the distortion is less than 7%, with little distortion. As shown in FIG. 4, the maximum speckle radius RMS of the image space is smaller than 5mm, 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 0.1mm, most of the field of view MTF >0.8, 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=69.954mm in this embodiment, lx=5000 mm, at which point an object image can be clearly transmitted to the image side. Y' = 828.8mm in this example. As shown in fig. 7, the system produces maximum distortion, and distortion is less than 5%, with little distortion. As shown in FIG. 8, the maximum speckle radius RMS of the image space is smaller than 3mm, 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 >0.8, the contrast and contrast are higher, the contrast is higher, and the lens performs better at full aperture.

In yet another embodiment, lw=59.958 mm and lx=25000 mm in this embodiment, where the object image can be clearly transmitted to the image side. Y' = 4245.416mm in this example. The system generates maximum distortion, the distortion is less than 3%, and the distortion is small. The maximum diffuse spot radius RMS diameter of the image space is smaller than 25mm, 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 90 percent. At a spatial frequency of 0.05mm, the majority of the field of view MTF >0.3, 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 in the embodiments 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 of 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 present application may occur to one skilled in the art. Such modifications, improvements, and modifications are intended to be suggested within this application, and are therefore within the spirit and scope of the exemplary embodiments of this application.

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 present 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 present application may be combined as suitable.

Likewise, it should be noted that in order to simplify the presentation disclosed herein 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 presented in the claims are required for 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 that may be employed in some embodiments to confirm the breadth of the range, in particular embodiments, the setting of such numerical values is as precise as possible.

For each patent, patent application publication, and other material, such as articles, books, specifications, publications, documents, etc., cited in this application, the entire contents of which are hereby incorporated by reference into this application, except for the application history documents which are inconsistent or conflict with the contents of this application, and for documents which have limited the broadest scope of the claims of this application (currently or hereafter attached to this application). It is noted that the descriptions, definitions, and/or terms used in the subject matter of this application are subject to the use of descriptions, definitions, and/or terms in case of inconsistent or conflicting disclosure.

The foregoing has outlined the detailed description of the embodiments of the present application, and specific examples have been presented herein to illustrate the principles and embodiments of the present application, the above examples being provided solely to assist in the understanding of the methods and core ideas 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 contents of the present specification should not be construed as limiting the present application in summary.

Claims (10)

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 and have a common optical axis from the object side (200) to the image side (300), wherein the optical power of each of the first lens (110), the fourth lens (140) and the fifth lens (150) is larger than 0, and the optical power of each of the second lens (120) and the third lens (130) is smaller than 0; the system focal length of the projection lens (100) ranges from 250mm to 260mm.

2. The projection lens according to claim 1, characterized in that the optical power fa1 of the first lens (110) satisfies: fa1 is more than 0.006 and less than 0.00602;

the optical power fa2 of the second lens (120) satisfies: -0.001455 < fa2 < -0.00145;

the optical power fa3 of the third lens (130) satisfies: -0.0117 < fa3 < -0.011696;

the optical power fa4 of the fourth lens (140) satisfies: 0.004325 fa4 is less than 0.00433;

the optical power fa5 of the fifth lens (150) satisfies: 0.00521 fa5 0.005215.

3. The projection lens according to claim 2, characterized in that the optical power fa1= 0.00601 of the first lens (110); -optical power fa2= -0.001453 of the second lens (120); -optical power fa3= -0.011698 of the third lens (130); the optical power fa4= 0.004327 of the fourth lens (140); the optical power fa5= 0.005214 of the fifth lens (150).

4. 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).

5. The projection lens of claim 4 wherein the first convex surface is located at a distance 79.131mm from the second convex surface, the first concave surface is located at a distance 34.019mm from the second concave surface, the third convex surface is located at a distance 12.567mm from the third concave surface, and the fourth convex surface is located at a distance 1.500mm from the second plane along a path along which the optical axis lies.

6. The projection lens of claim 4 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 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.

7. Projection lens according to claim 1, characterized in that the maximum object height y of the projection lens (100) satisfies: 42mm < y < 43mm; the light-emitting field angle w of the projection lens (100) satisfies: w is less than 20 DEG and 18 DEG.

8. The projection lens according to claim 1, characterized in that the system focal length of the projection lens (100) is 255.275mm.

9. The projection lens according to claim 1, characterized in that the diameter of the third lens (130) is equal to 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).

10. A luminaire characterized by comprising a projection lens (100) according to any one of claims 1 to 9.