CN114857543B - Light projector lens, light emitting module with light projector lens and light projector - Google Patents

Light projector lens, light emitting module with light projector lens and light projector Download PDF

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Publication number
CN114857543B
CN114857543B CN202210689029.XA CN202210689029A CN114857543B CN 114857543 B CN114857543 B CN 114857543B CN 202210689029 A CN202210689029 A CN 202210689029A CN 114857543 B CN114857543 B CN 114857543B
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Prior art keywords
curved surface
light
end point
lens
lens body
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CN114857543A (en
Inventor
泮璐媚
仇旻
樊军
周键斌
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Zhejiang Guangcone Technology Co ltd
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Zhejiang Guangcone Technology Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F21V5/046—Refractors for light sources of lens shape the lens having a rotationally symmetrical shape about an axis for transmitting light in a direction mainly perpendicular to this axis, e.g. ring or annular lens with light source disposed inside the ring

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

The invention discloses a projector lens, a light emitting module with the projector lens and a projector, wherein the projector lens comprises a mounting plate, a lens body and a reflector, wherein the lens body and the reflector are sequentially arranged along a rotating shaft; the bottom surface of the lens body is provided with an incident curved surface, and one side of the lens body, which is far away from the rotating shaft, is provided with a first refraction curved surface and a second refraction curved surface which are connected; light generated by the light source is refracted to a preset receiving surface through the first refraction curved surface, is refracted to the receiving surface through the second refraction curved surface, and is reflected to the receiving surface by the reflector. According to the invention, through the design of the lens body and the reflector, the light spots projected by the first emergent surface refraction, the second emergent surface refraction and the reflector are overlapped on the receiving surface to generate a gradual change effect.

Description

Light projector lens, light emitting module with light projector lens and light projector
Technical Field
The present invention relates to the field of lighting technologies, and in particular, to a projector lens, a light emitting module with the projector lens, and a projector.
Background
The projector is a lamp with the illumination higher than the surrounding environment on the surface to be illuminated, and is also called a spotlight;
in practical use, the outdoor large-area lighting lamp is widely used in scenes such as large-area operation field mines, building outlines, stadiums, overpasses, monuments, parks, flower beds and the like, namely, the outdoor large-area lighting lamp can be regarded as a projection lamp, but the projection result of the projection lamp is mostly round light spots nowadays, and the gradual change of brightness and the poor decorative effect cannot be realized.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a projector lens capable of projecting gradually-changed rectangular light spots, a light emitting module with the projector lens and a projector.
In order to solve the technical problems, the invention is solved by the following technical scheme:
a projector lens which is a half-rotating body (i.e., a three-dimensional structure formed by rotating a geometric figure only by half a circle), and has one side thereof close to a rotation axis as a bottom;
the projection lamp lens comprises a mounting plate, and a lens body and a reflector which are sequentially arranged along a rotating shaft, wherein the lens body and the reflector are mounted on the mounting plate;
the mounting plate is provided with a first positioning strip and a second positioning strip;
the first positioning strip is used for indicating the installation position of the lens body;
the second positioning strip is used for indicating the installation position of the reflector;
the bottom surface of the lens body is recessed in a direction away from the rotating shaft to form an incident curved surface, and a light source cavity for placing a light source is formed by surrounding the incident curved surface;
a first emergent surface is arranged on one side of the lens body, which is far away from the rotating shaft, and comprises a first refractive curved surface and a second refractive curved surface which are connected with each other;
the reflector protrudes outwards towards the direction close to the lens body to form a reflecting curved surface;
light generated by the light source is refracted to a preset receiving surface through the first refraction curved surface to form a first rectangular light spot, is refracted to the receiving surface through the second refraction curved surface to form a second rectangular light spot, is emitted to the reflection curved surface through the lens body, and is reflected to the receiving surface through the reflection curved surface to form a third rectangular light spot;
the first rectangular light spot, the second rectangular light spot and the third rectangular light spot are overlapped on the receiving surface to form a fourth rectangular light spot.
As one possible implementation: a second emergent surface is arranged on one side of the lens body, which is far away from the reflector, and one side of the second emergent surface is connected with the bottom surface of the lens body, and the other side of the second emergent surface is connected with the first refractive curved surface;
the second emergent surface is a semicircular plane perpendicular to the rotating shaft, and the circle center of the second emergent surface coincides with the rotating shaft.
As one possible implementation:
the first refraction curved surface is formed by rotating a first curve around the rotation shaft for half a circle, the first curve comprises a first endpoint and a second endpoint, the first endpoint intersects with the second emergent surface, and the first endpoint intersects with the second refraction curved surface;
the first curve protrudes outwards from the connecting line of the first end point and the second end point.
As one possible implementation:
the second refraction curved surface is formed by rotating a second curve around the rotation shaft for half a circle, and the second curve comprises a second endpoint and a third endpoint;
the second curve protrudes outwards from the connecting line of the second end point and the third end point.
As one possible implementation:
the light source cavity is a hemispherical body, and light rays emitted by the light source vertically enter the incidence curved surface.
As one possible implementation:
when the point on the circumference of the second emergent surface is connected with the sphere center of the light source cavity, the included angle formed by the obtained connecting line and the rotating shaft is 25-35 degrees;
when the first end point and the second end point are respectively connected with the sphere center, the formed included angle is 55-65 degrees;
when the second end point is connected with the sphere center, the obtained connecting line is perpendicular to the rotating shaft;
and when the second end point and the third end point are respectively connected with the sphere center, the formed included angle is 25-35 degrees.
As one possible implementation:
the reflection curved surface is formed by rotating a reflection curve around a rotation shaft for half a circle, the reflection curve comprises a fixed end point and a movable end point, the fixed end point is the highest point of the reflection curved surface, and the movable end point is the lowest point of the reflection curved surface;
the reflection curve is a curve formed by the connection line of the fixed end point and the movable end point sinking towards the direction far away from the lens body.
As one possible implementation:
the device also comprises a mounting plate;
and a light outlet is formed in one side of the lens body, which is close to the reflector, and light rays emitted by the light source are emitted to the reflecting curved surface through the light outlet. The invention also provides a light-emitting module, which comprises the projection lamp lens.
The invention also provides a projection lamp which comprises at least one light-emitting module.
The invention has the remarkable technical effects due to the adoption of the technical scheme:
according to the invention, through the design of the lens body and the reflector, part of light generated by the light source is refracted to the receiving surface through the first emergent surface, part of the light is refracted to the receiving surface through the second refracting surface, and part of the light is reflected to the receiving surface through the reflecting curved surface, so that a gradual change effect is generated by superposition on the receiving surface, visual comfort is brought to people, and in actual use, a user can highlight display contents by utilizing the light and shade of the projected light as required.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, 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 perspective view of a projector lens according to the present invention;
FIG. 2 is a schematic side view of a projector lens according to the present invention;
FIG. 3 is a schematic illustration of a first geometry and a second geometry;
FIG. 4 is a schematic view of the projector lens of FIG. 1;
FIG. 5 is a wall illumination view of the projector lens of FIG. 1;
FIG. 6 is a light distribution curve (polar coordinates) of the projector lens shown in FIG. 1;
in the figure:
100 is a lens body, 110 is an incident curved surface, 120 is a first exit surface (not shown in the figure), 121 is a first refraction curved surface, 122 is a second refraction curved surface, 130 is a second exit surface, 140 is an light emitting layer 140, 200 is a reflector, 210 is a reflection curved surface, 300 is a mounting plate, b is a first end point, a is a second end point, and c is a third end point.
Detailed Description
The present invention will be described in further detail with reference to the following examples, which are illustrative of the present invention and are not intended to limit the present invention thereto.
In embodiment 1, the projector lens is a half-rotating body as shown in fig. 1 to 6, and in this embodiment, a side close to the rotation axis is the bottom, and the rotation axis is shown as the y-axis in fig. 3.
The projection lamp lens comprises a lens body 100 and a reflector 200 which are sequentially arranged along a rotating shaft, wherein the lens body 100 is formed by rotating a first geometric figure around the rotating shaft for half a circle (180 degrees), the reflector 200 is formed by rotating a second geometric figure around the rotating shaft for half a circle (180 degrees), and a person skilled in the art can set the interval between the lens body 100 and the reflector 200 by himself, and the interval is more than 0;
as shown in fig. 1, the bottom surface of the lens body 100 is recessed away from the rotation axis to form an incident curved surface 110, and the incident curved surface 110 surrounds a light source cavity for placing a light source; a person skilled in the art can select a proper LED light source according to actual needs;
the reflector 200 protrudes outward toward the direction approaching the lens body 100 from the side approaching the lens body 100, so as to form a reflective curved surface 210, the reflective curved surface 210 is a free curved surface, and light is totally reflected on the reflective curved surface 210.
In practical use, the projector lens is vertically disposed, the rotation axis is parallel to a preset receiving surface, the reflector 200 is located below the lens body 100, a part of light generated by the light source is refracted to the receiving surface through the lens body 100, the part of light is directed to the reflecting curved surface 210 of the reflector 200, and the light is reflected to the receiving surface through the reflecting curved surface 210 by the design that the reflecting curved surface 210 protrudes outwards towards the direction close to the lens body 100, so that the loss caused by the fact that the part of light is not projected to the receiving surface is avoided, and the light efficiency is effectively utilized.
The existing projection lamp is fully utilized in light efficiency, the projection angle of the projection lamp is required to be adjusted, so that light rays diverging downwards can be projected to a receiving surface, but the projected light spots are often deformed when the angle is adjusted, the rectangular light spots are easy to deform into trapezoid light spots, the area to be illuminated cannot be covered completely, and the decoration is poor.
Referring to fig. 1, the lens body 100 is provided with a first exit surface 120 at a side far from the rotation axis, the first exit surface 120 includes a first refractive curved surface 121 and a second refractive curved surface 122 that are connected, and the first refractive curved surface 121 and the second refractive curved surface 122 are free curved surfaces;
referring to fig. 4, the light generated by the light source is refracted to a preset receiving surface through the first refraction curved surface 121 to form a first rectangular light spot, and is refracted to the receiving surface through the second refraction curved surface 122 to form a second rectangular light spot;
the light generated by the light source is further emitted to the reflective curved surface 210 through the lens body 100, and reflected by the reflective curved surface 210 to the receiving surface, so as to form a third rectangular light spot;
the first rectangular light spot, the second rectangular light spot and the third rectangular light spot are overlapped on the receiving surface to form a fourth rectangular light spot, and the fourth rectangular light spot is a light spot with the brightness decreasing uniformly.
In this embodiment, through the design of the lens body 100 and the reflector 200, a part of the light generated by the light source is refracted to the receiving surface through the first emergent surface 120, a part of the light is refracted to the receiving surface through the second refractive surface, and a part of the light is reflected to the receiving surface through the reflective curved surface 210, so that a gradual change effect is superimposed on the receiving surface, which gives a visual comfort, and in actual use, a user can utilize the light and shade of the projected light to highlight the display content as required.
If the present merchant utilizes the projecting lamp to project propaganda information to the ground outside the store, attracts passers-by, but the facula that its projection often is circular, and has certain distance with its store, the propaganda effect is not good, if the projecting lamp that utilizes the projecting lamp lens to constitute that this embodiment provided, it will form the facula that the luminance increases gradually from the road surface to the store gate, can effectively attract passers-by to pay attention to the store, and the propaganda effect is better.
Further:
the light source cavity is a hemispherical body, and the light emitted by the light source is perpendicularly incident to the incident curved surface 110.
The direction of the light will not change when the light is vertically incident.
In this embodiment, by designing the incident curved surface 110, refraction or reflection is avoided when light passes through the incident curved surface 110, so that the light utilization rate is improved, and the complexity of light distribution on the first exit surface 120 and the reflective curved surface 210 is reduced.
Further:
a second exit surface 130 is disposed on a side of the lens body 100 away from the reflector 200, one side of the second exit surface 130 is connected to the bottom surface of the lens body 100, and the other side is connected to the first refractive curved surface 121;
the second exit surface 130 is a semicircular plane perpendicular to the rotation axis, and the center of the second exit surface coincides with the rotation axis.
The second exit surface 130 is designed to be a plane in this embodiment, so as to avoid the light emitted to the second exit surface 130 from generating total reflection at the second exit surface 130, which affects the light projecting effect.
Further:
referring to fig. 3, when the point (point b) on the circumference of the second exit surface 130 is connected to the center (origin) of the light source cavity, the included angle (angle α) formed by the obtained connecting line and the rotation axis is 25 ° to 35 °;
when the angle α is too large, more light loss will occur, and when the angle α is too small, total reflection will occur, so that the included angle is 30 ° in this embodiment;
in this embodiment, the center of the sphere of the light source cavity is taken as an origin, the optical axis of the light source is taken as an x-axis, the direction of the origin pointing to the receiving surface is taken as an x-axis positive direction, the rotation axis is taken as a y-axis, and the direction of the origin pointing to the reflector 200 is taken as a y-axis negative direction;
the angle of the light rays from the origin to the center of the second exit surface 130 is 90 degrees, and the angle of the light rays from the origin to any point on the circumference of the second exit surface 130 is 60 degrees;
further:
the first refractive curved surface 121 described with reference to fig. 3 is formed by a first curve that is rotated by half a revolution about the rotation axis, and includes a first end point (point b) intersecting the second exit surface 130 and a second end point (point a) intersecting the second refractive curved surface 122;
the first curve protrudes outwards from the connecting line of the first end point and the second end point.
The first curve may be calculated based on clipping.
Further:
when the second end point is connected with the sphere center, the obtained connecting line is perpendicular to the rotating shaft;
that is, the second end point is located on the optical axis of the light source, the angle of the light passing through the second end point is 0 °, the distance from the second end point to the light source can be set by a person skilled in the art according to the size of the required projector lens and the size of the adopted light source, in this embodiment, the width of the light source is 3.5mm, and the distance from the second end point to the light source is 8cm.
When the first end point and the second end point are respectively connected with the sphere center, the formed included angle (angle beta) is 55-65 degrees, and in the embodiment, the included angle is 60 degrees;
as can be seen from the above, the angle of the light passing through the first refractive curved surface 121 and the second exit surface 130 ranges from 0 ° to 90 °.
Further:
referring to fig. 3, the second refractive curved surface 122 is formed by a second curve rotated about the rotation axis by a half circle, the second curve including a second end point (point a) and a third end point (point c);
the second curve protrudes outwards from the connecting line of the second end point and the third end point.
The second curve can be calculated by clipping.
Further:
when the second end point and the third end point are respectively connected with the sphere center, the formed included angle (angle gamma) is 25-35 degrees, and when the included angle exceeds the range, the effects of the second rectangular light spot and the third rectangular light spot are affected;
in this embodiment the angle is 30.
The angle range of the light passing through the second refractive curved surface 122 and the light directed to the reflective curved surface 210 is 0 ° to-90 °, the angle range of the light passing through the second refractive curved surface 122 in this embodiment is 0 ° to-30 °, as shown by the angle γ in fig. 3, and the angle range of the light directed to the reflective curved surface 210 is-30 ° to-90 °, as shown by the angle δ in fig. 3;
if the angle of the light passing through the third end point is-40 °, the light with the angle of-35 ° to-40 ° is easy to generate total reflection due to the overlarge divergence angle when passing through the second refractive curved surface 122, so that the light cannot be refracted or split.
Note that: a beam of white light is composed of various lights with different wavelengths, and the refractive indexes of the lights with different wavelengths are different, so that when the included angle between the incident light and the normal direction of the lens is larger, the lights with certain wavelengths are easy to be refracted, and the lights with certain wavelengths are internally fully emitted, so that the emergent light loses the light with certain colors to cause color separation.
Further:
the reflective curved surface 210 is formed by rotating a reflective curved surface around a rotation axis by half a circle, the reflective curved surface comprises a fixed end point and a movable end point, the fixed end point is the highest point of the reflective curved surface 210, and the movable end point is the lowest point of the reflective curved surface 210;
the reflection curve is a curve formed by recessing a connecting line of the fixed end point and the movable end point in a direction away from the lens body 100.
The reflection curve can be obtained by calculation through a clipping method;
the smaller the divergence angle of the light beam (e.g., the light beam is-20 deg., the divergence angle is 20 deg.), the longer the distance between the fixed end point and the movable end point in the x direction, so that only the light beam with the divergence angle of 30 deg. or more is reflected in the present embodiment.
Further, a light outlet is disposed on a side of the lens body 100 near the reflector 200, and the light emitted by the light source is directed to the reflective curved surface 210 through the light outlet.
In this embodiment, by designing the light outlet, the light emitted to the reflector 200 is prevented from being refracted or internally reflected when passing through the lens body 100, so that the light generated by the light source is effectively utilized and the color separation of the light is avoided.
Further, the light outlet is provided with a light outlet layer 140, the light outlet layer 140 includes an inner layer and an outer layer, as shown in fig. 4, the light emitted by the light source is perpendicularly incident to the inner layer, and the light passing through the inner layer is perpendicularly incident to the outer layer, and is directed to the reflective curved surface 210 through the outer layer.
The light source placed in the light source cavity is jointly protected by the light emitting layer 140 and the lens body 100 in this embodiment;
note that: the light entering the inner layer and the outer layer is vertically incident, so that the direction of the corresponding light is not changed.
Further, the light-emitting layer 140 and the lens body 100 are integrally formed.
In this embodiment, the lens body 100 and the light-emitting layer 140 adopt a PMMA structure, and the refractive index thereof is 1.49.
Some light beams emitted from the light source are perpendicularly incident on the lens body 100, and the rest light beams are perpendicularly incident on the light-emitting layer 140.
Further:
referring to fig. 2, a mounting plate 300 is also included;
the bottoms of the lens body 100 and the reflector 200 are mounted on the mounting plate 300.
A person skilled in the art may fix the lens body 100 and the reflector 200 on the mounting plate 300 by means of gluing or the like, or may set mounting blocks on the bottom surfaces of the lens body 100 and the reflector 200, and set mounting grooves corresponding to the mounting blocks on the mounting plate 300, and fix the lens body 100 and the reflector 200 on the mounting plate 300 by cooperating the mounting blocks with the mounting grooves;
as can be seen from the above, there are various schemes for mounting the lens body 100 and the reflector 200 on the mounting plate 300 in the art, and the present embodiment is not limited thereto.
Further:
the mounting plate 300 is provided with a first positioning strip and a second positioning strip;
the first positioning strip is used for indicating the installation position of the lens body 100;
the second positioning bar is used to indicate the installation position of the reflector 200.
The steps of calculating the first curve, the second curve and the third curve based on the clipping method are as follows:
s100, calculating a first curve:
presetting an included angle value formed when the first end point and the second end point are respectively connected with the sphere center, wherein the included angle value is 60 degrees in the embodiment;
referring to fig. 4, since each incident ray entering the first curve intersects the first curve, a corresponding curve can be generated through the intersection point by calculating the intersection point corresponding to each incident ray.
S110, determining the angle of incident light rays corresponding to the curve:
dividing the light passing through the first curve into N parts according to the angle, and determining the angle of the ith part of light to be theta i (0≤i≤N)：
S120, calculating a unit vector of each incident rayThe calculation formula is as follows:
s130, calculating the incident lightUnit vector of emergent ray corresponding to one by one>The calculation formula is as follows:
wherein d represents the distance of the receiving surface from the lens, which is a preset value, in this embodiment d=1000 mm; h (i) represents the height of the ith outgoing ray.
The point where h=0 is taken as the point corresponding to the initial outgoing ray.
Let the height of the reception on the receiving surface be 0 to H, H be a preset value, in this embodiment H be 500mm, and the calculation formula of H (i) is:
s140, calculating a first curve based on the refraction law:
the incident light and the emergent light satisfy the law of refraction:
wherein n is 1 Corresponding to the outgoing lightRefractive index, n 2 For the refractive index corresponding to the incident light, n in this embodiment 1 ＝1.49，n 2 ＝1，As tangential unit vector, +.>
The calculation mode of the ith point on the first curve is as follows:
acquiring an intersection point of the i-1 th incident ray and the first curve to obtain a reference point;
obtaining a tangential direction unit vector corresponding to a reference point, and obtaining a reference vector;
constructing a reference tangent line based on the reference point and the reference vector;
and calculating the intersection point of the reference tangent and the ith incident ray, and taking the obtained intersection point as the ith point on the first curve.
After coordinates of each point in the first curve are sequentially calculated based on the above method, the center and radius of the second exit surface 130 can be determined according to the coordinates of the nth point.
Note that: the initial point (i=0) on the first curve is a preset point, which is set by the person skilled in the art according to the actual situation, and in this embodiment is (8, 0).
The technique of generating the corresponding curves based on the plurality of point coordinates is the prior art, and is not described in detail in the present embodiment.
S200, calculating a second curve:
presetting an included angle value formed when the second end point and the third end point are respectively connected with the sphere center, wherein the included angle value is 30 degrees in the embodiment;
as above, by calculating the intersection point of the second curve and the corresponding incident ray, a corresponding curve can be generated through the intersection point.
S210, determining the angle of incident light rays corresponding to the curve:
dividing the light passing through the second curve into M parts according to the angle, determiningThe angle of the jth light is theta j (0≤j≤M)：
S220, calculating the unit vector of each incident rayThe calculation formula is as follows:
s230, calculating the incident lightUnit vector of emergent ray corresponding to one by one>The calculation formula is as follows:
where h (j) represents the height of the j-th exit ray.
Taking a point with h=0 as a point corresponding to the initial emergent ray, the calculation formula of h (j) is as follows:
s240, calculating a second curve based on the refraction law:
the second curve is calculated in the manner of calculating the first curve in the above-described step S130, and the initial point of the second curve is the same as the initial point of the first curve.
By setting the radius corresponding to the light source cavity and the thickness of the light emitting layer 140 by a person skilled in the art, the first geometric figure forming the lens body 100 can be generated by combining the calculated first curve and second curve.
S300, calculating a reflection curve:
the third end point is connected with the sphere center, and an included angle value formed by the obtained connecting line and the y axis is preset, wherein the included angle value is 60 degrees in the embodiment;
by calculating the intersection point of the reflection curve and the corresponding incident ray, the corresponding curve can be generated through the intersection point.
S310, determining the angle of the incident light rays of the corresponding curve:
dividing the light ray passing through the reflection curve into L parts according to the angle, and determining the angle of the kth part of light ray to be theta k (0≤k≤L)：
S320, calculating unit vector of each incident rayThe calculation formula is as follows:
s330, calculating the incident lightUnit vector of emergent ray corresponding to one by one>The calculation formula is as follows:
where h (k) represents the height of the kth outgoing ray.
Taking a point with h=0 as a point corresponding to the initial emergent ray, the calculation formula of h (k) is as follows:
s340, calculating a reflection curve based on a reflection law:
the incident light and the emergent light satisfy the law of reflection:
the reflection curve is calculated in the above-described manner in step S130 based on the incident light and the tangential unit vector, and the initial point of the reflection curve is set to be the fixed point, in this embodiment, (0, -5).
Based on the preset thickness of the reflector 200, the person skilled in the art can generate the second geometric figure by combining the calculated reflection curve, and the person skilled in the art can set the coordinates of the fixed end point according to the actual needs by himself, so that the generated second geometric figure is not overlapped with the first geometric figure.
The first geometric figure and the second geometric figure are rotated around the y axis by plus or minus 90 degrees, so that the lens body 100 and the reflector 200 corresponding to the lens body can be obtained.
The lens obtained in the embodiment is verified based on ray tracing software tracePro, and the specific steps are as follows:
a receiving plate with a radius of 2000mm was set as a model of an actual wall surface, lenses were placed 1000mm away from the wall surface, and simulation was performed using XPE-2 light source, and the results are shown in FIGS. 5 and 6.
As can be seen from the wall illuminance graph shown in FIG. 5, the position marked by the central horizontal line, namely the value 0, is the ground, the positive direction of the y axis is the height direction of the wall, the actual light spot of the light passing through the lens is in a rectangular shape, the height is about 500mm, the brightness is gradually decreased from the center to the left and the right, and the gradually-changed rectangular light spot is gradually decreased from the ground to the high.
Since the actual light source is not equal to the point light source, the illuminance of the light rays simulated by the actual light source is slightly different from the theoretical value, and as can be seen from the illuminance map, the actual light spot is a gradual change rectangular light spot with the wavelength of 3000mm by 700 mm.
Embodiment 2, a light emitting module, comprising the projector lens of embodiment 1.
Embodiment 3, a projector, comprising at least one light emitting module as set forth in embodiment 2.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
It should be noted that:
reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
In addition, the specific embodiments described in the present specification may differ in terms of parts, shapes of components, names, and the like. All equivalent or simple changes of the structure, characteristics and principle according to the inventive concept are included in the protection scope of the present invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions in a similar manner without departing from the scope of the invention as defined in the accompanying claims.

Claims (10)

1. A projector lens, characterized in that the projector lens is a semi-rotating body, and one side of the semi-rotating body, which is close to a rotating shaft, is taken as a bottom;
the projection lamp lens comprises a mounting plate, and a lens body and a reflector which are sequentially arranged along a rotating shaft, wherein the lens body and the reflector are mounted on the mounting plate;
the mounting plate is provided with a first positioning strip and a second positioning strip;
the first positioning strip is used for indicating the installation position of the lens body;
the second positioning strip is used for indicating the installation position of the reflector;
the bottom surface of the lens body is recessed in a direction away from the rotating shaft to form an incident curved surface, and a light source cavity for placing a light source is formed by surrounding the incident curved surface;
a first emergent surface is arranged on one side of the lens body, which is far away from the rotating shaft, and comprises a first refractive curved surface and a second refractive curved surface which are connected with each other;
the reflector protrudes outwards towards the direction close to the lens body to form a reflecting curved surface; light generated by the light source is refracted to a preset receiving surface through the first refraction curved surface to form a first rectangular light spot, is refracted to the receiving surface through the second refraction curved surface to form a second rectangular light spot, is emitted to the reflection curved surface through the lens body, and is reflected to the receiving surface through the reflection curved surface to form a third rectangular light spot;
the first rectangular light spot, the second rectangular light spot and the third rectangular light spot are overlapped on the receiving surface to form a fourth rectangular light spot.
2. The projector lens of claim 1 wherein: a second emergent surface is arranged on one side of the lens body, which is far away from the reflector, and one side of the second emergent surface is connected with the bottom surface of the lens body, and the other side of the second emergent surface is connected with the first refractive curved surface;
the second emergent surface is a semicircular plane perpendicular to the rotating shaft, and the circle center of the second emergent surface coincides with the rotating shaft.
3. The projector lens of claim 2 wherein:
the first refraction curved surface is formed by rotating a first curve around the rotation shaft for half a circle, the first curve comprises a first endpoint and a second endpoint, the first endpoint intersects with the second emergent surface, and the first endpoint intersects with the second refraction curved surface;
the first curve protrudes outwards from the connecting line of the first end point and the second end point.
4. The projector lens of claim 3 wherein:
the second refraction curved surface is formed by rotating a second curve around the rotation shaft for half a circle, and the second curve comprises a second endpoint and a third endpoint;
the second curve protrudes outwards from the connecting line of the second end point and the third end point.
5. The projector lens of claim 4 wherein:
the light source cavity is a hemispherical body, and light rays emitted by the light source vertically enter the incidence curved surface.
6. The projector lens of claim 5 wherein:
when the point on the circumference of the second emergent surface is connected with the sphere center of the light source cavity, the included angle formed by the obtained connecting line and the rotating shaft is 25-35 degrees;
when the first end point and the second end point are respectively connected with the sphere center, the formed included angle is 55-65 degrees;
when the second end point is connected with the sphere center, the obtained connecting line is perpendicular to the rotating shaft;
and when the second end point and the third end point are respectively connected with the sphere center, the formed included angle is 25-35 degrees.
7. The projector lens of any one of claims 1 to 6 wherein:
the reflection curved surface is formed by rotating a reflection curve around a rotation shaft for half a circle, the reflection curve comprises a fixed end point and a movable end point, the fixed end point is the highest point of the reflection curved surface, and the movable end point is the lowest point of the reflection curved surface;
the reflection curve is a curve formed by the connection line of the fixed end point and the movable end point sinking towards the direction far away from the lens body.
8. The projector lens of any one of claims 1 to 6 wherein:
and a light outlet is formed in one side of the lens body, which is close to the reflector, and light rays emitted by the light source are emitted to the reflecting curved surface through the light outlet.
9. A lighting module comprising the projector lens of any one of claims 1 to 8.
10. A projector comprising at least one lighting module according to claim 9.
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