CN111076147A - Beam shaping lens and illuminating lamp - Google Patents

Abstract

The embodiment of the invention discloses a beam shaping lens and an illuminating lamp, wherein the beam shaping lens comprises a first part and a second part surrounding the first part; the first part comprises a light incident surface and a light emergent surface which are oppositely arranged, the second part comprises a light incident surface, a reflecting surface and a light emergent surface, the light emergent surface of the second part is non-planar, and the caliber of the light emergent surface of the second part is larger than that of the light emergent surface of the first part; the light incident surface of the second part is arranged around the light incident surface of the first part, and a cavity is formed between the light incident surface of the first part and the light incident surface of the second part; in the light beams emitted by the light source in the cavity and on the central axis of the beam shaping lens, a first part of light with an emitting angle smaller than a first threshold value is emitted from the light emitting surface of the first part after being incident from the light incident surface of the first part, a second part of light with an emitting angle not smaller than the first threshold value is incident from the light incident surface of the second part, is reflected into divergent light beams by the reflecting surface and then is incident to the light emitting surface of the second part, and is collimated and emitted by the light emitting surface of the second part.

Description

Beam shaping lens and illuminating lamp

Technical Field

The present invention relates to optical devices, and particularly to a beam shaping lens and an illumination lamp.

Background

With the development of the LED semiconductor technology, the LED luminous source is widely applied in the fields of medical treatment, industry, cultural entertainment and the like. LED light sources are becoming alternatives to many conventional light sources with the outstanding advantages of energy conservation, small size, and long lifetime. However, since the LED light source is a scattering light source with a large divergence angle, a shaping element is required to shape the light emitted from the LED light source in some special applications.

Disclosure of Invention

An embodiment of the present invention provides a beam shaping lens, including:

a first portion and a second portion surrounding the first portion;

the first part comprises a light inlet surface and a light outlet surface which are oppositely arranged, the second part comprises a light inlet surface, a reflecting surface and a light outlet surface, wherein the light outlet surface of the second part is non-planar, and the caliber of the light outlet surface of the second part is larger than that of the light outlet surface of the first part;

the light incident surface of the second portion is arranged around the light incident surface of the first portion, and a cavity is formed between the light incident surface of the first portion and the light incident surface of the second portion;

among light beams emitted by the light source on the bottom surface of the light beam shaping lens and the central axis of the light beam shaping lens, a first part of light with an emitting angle smaller than a first threshold value is emitted from the light emitting surface of the first part after being incident from the light incident surface of the first part, a second part of light with an emitting angle not smaller than the first threshold value is incident from the light incident surface of the second part, is reflected into a divergent light beam by the reflecting surface, is incident to the light emitting surface of the second part, and is collimated and emitted through the light emitting surface of the second part.

Optionally, the first part is configured to shape at least 60% of the first part of light into a light beam with an exit angle not smaller than a second threshold, and the second part is configured to shape at least 60% of the second part of light into a light beam with an exit angle not larger than the second threshold, so that the exit light of the light source forms a light spot with a central area illuminance higher than that of a peripheral area surrounding the central area beyond a specific distance through the beam shaping lens.

Optionally, the second threshold is in a range of 2-10 degrees (including 2 degrees and 10 degrees).

Optionally, the light-emitting surface of the second portion is a convex curved surface extending outward from the periphery of the light-emitting surface of the first portion.

Optionally, the reflecting surface of the second portion is a smooth curved surface.

Optionally, the reflecting surface of the second portion includes a first range surrounding a central axis of the beam shaping lens, and a second range surrounding the first range, respectively;

the first range is recessed toward a direction of a central axis of the beam shaping lens from the second range, so that a reflection surface of the second portion is stepped.

Optionally, the reflective surface of the second portion further includes a third annular area connecting the first area and the second area, and the third annular area is substantially parallel to the bottom surface of the beam shaping lens.

Optionally, the light exit surface of the second portion includes a first range surrounding a central axis of the beam shaping lens and a second range surrounding the first range, wherein the first range is recessed toward the bottom surface of the beam shaping lens compared with the second range, so that the light exit surface of the second portion is in a step shape.

Optionally, the first range of the reflection surface is used for reflecting a part of the second part of light from the light incident surface of the second portion to the first range of the light emergent surface of the second portion;

the second range of the reflection surface is used for reflecting a part of the second part of light from the light incident surface of the second part to the second range of the light emergent surface of the second part.

Optionally, of the light beams emitted by the light source, at least part of the light beams with the emission angles between 30 degrees and 60 degrees are incident on the second range of the reflecting surface;

and/or the presence of a gas in the gas,

at least part of light beams with the emergent angle not less than 60 degrees in the light beams emitted by the light source enter the first range of the reflecting surface.

Optionally, the light emitting surface of the first portion is recessed toward the bottom surface of the beam shaping lens compared with the first range of the second portion, so that the light emitting surface of the first portion, the first range of the light emitting surface of the second portion, and the second range of the light emitting surface of the second portion are located at different heights, respectively.

Optionally, a caliber of the light emitting surface of the second portion is greater than 4 times of a caliber of the light emitting surface of the first portion.

Optionally, a ratio of an average distance between the bottom surface of the beam shaping lens and the light exit surface of the first portion to a height of the beam shaping lens is less than 0.3.

The embodiment of the invention also provides an illuminating lamp, which comprises

The beam shaping lens described above;

the light source bracket and the light source fixed on the light source bracket;

the beam shaping lens is fixed on the light source bracket, so that the light source is positioned in a cavity of the beam shaping lens.

According to the technical scheme, the embodiment of the invention has the following advantages:

in the transparency of the invention, after being incident from the light incident surface of the second part of the lens, the large-angle light beam emitted by the light source is reflected by the reflecting surface of the second part to form a light beam with a certain divergence angle; according to the principle of conservation of etendue, the aperture of the light-emitting surface of the second portion is large, so that the divergence angle of the light beam emitted from the light-emitting surface of the second portion is small, and the collimation effect of the second portion on the light beam is improved.

Drawings

FIG. 1 is a schematic cross-sectional view of an embodiment of a beam shaping lens according to the present invention;

FIG. 2 is a perspective view of one embodiment of a cross-sectional view of the beam-shaping lens shown in FIG. 1;

FIG. 3 is a schematic cross-sectional view of another embodiment of a beam-shaping lens according to an embodiment of the present invention;

FIG. 4 is a perspective view of one embodiment of the beam shaping lens of FIG. 3 in cross-section;

FIG. 5 is a schematic cross-sectional view of another embodiment of a beam-shaping lens according to the present invention;

FIG. 6 is a perspective view of one embodiment of the beam shaping lens of FIG. 5 in cross-section;

FIG. 7 is a schematic structural diagram of one embodiment of a light source device of the present invention;

fig. 8 is a schematic structural diagram of an embodiment of the light source device of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Fig. 1 is a schematic cross-sectional view of an embodiment of a beam shaping lens according to an embodiment of the present invention, as shown in fig. 1. The cross section of the beam-shaping lens 10 includes a first region 11, and a second region 12 and a third region 13 respectively located on both sides of the first region 11. Wherein the second region 12 has the same structure as the third region 13 and is symmetrical about the central axis L of the beam-shaping lens. The second region 12 and the third region 13 are described below by taking the second region 12 as an example.

The first region 11 includes a light incident surface 111 and a light emitting surface 112 disposed opposite to each other, and the second region 12 includes a light incident surface 121, a bottom surface 122, a reflection surface 123 and a light emitting surface 124. The light incident surface 121 of the second region 12 and the light incident surface 131 of the third region 13 are respectively located at two sides of the light incident surface 111 of the first region 11, wherein the light incident surface 111 of the first region 11 generally extends along the transverse direction, and the light incident surface 121 of the second region 12 and the light incident surface 131 of the third region 13 generally extend along the longitudinal direction. A cavity 14 for accommodating a light source is formed between the light incident surface 111 of the first region 11, the light incident surface 121 of the second region 12, and the light incident surface of the third region 13.

The light emitting surface 124 of the second region 12 extends outward and generally upward from both sides of the light emitting surface 112 of the first region 11, and is in a convex curve shape. The reflection surface 123 of the second region 12 is disposed opposite to the light incident surface 121 of the second region 12, and is used for reflecting the light beam from the light incident surface 121 to the light emitting surface 124 of the second region 12 for emitting.

When the light source is disposed on both the bottom surface 122 of the beam shaping lens 10 and the central axis L of the beam shaping lens 10, among the light beams emitted from the light source: a first part of light with an emitting angle smaller than a first threshold value is emitted from the light emitting surface 112 of the first region 11 after being incident from the light incident surface 111 of the first region 11; of the second portion of light having the emission angle not smaller than the first threshold value, a portion on one side of the central axis L is incident from the light incident surface 121 of the second region 12, and a portion on the other side of the central axis L is incident from the light incident surface of the third region 13.

The light beam incident from the light incident surface 121 of the second region 12 is reflected by the reflection surface 123 of the second region 12 and then exits from the light exiting surface 124 of the second region 12; the light beam incident from the light incident surface of the third region 13 is reflected by the reflection surface of the third region 13 and then exits from the light exiting surface of the third region 13.

In some embodiments, the beam shaping lens is rotationally symmetric, i.e., the beam shaping lens is formed by rotating the lens cross-sectional view shown in fig. 1 about the central axis L.

Fig. 2 is a schematic perspective view of one embodiment of the beam shaping lens shown in fig. 1 and shown in cross-section in fig. 2. The beam-shaping lens 20 includes a first portion 21 formed by rotating the first region 11 in the cross-sectional view shown in fig. 1, and a second portion 22 formed by rotating the second region 12 (or the third region 13) in the cross-sectional view shown in fig. 1. As can be seen from the cross-sectional view, the first portion 21 formed after rotation includes the light incident surface 211 and the light emitting surface 212 which are oppositely disposed, and the second portion 22 includes the light incident surface 221, the bottom surface 222, the reflection surface 223 and the light emitting surface 224. The light incident surface 221 of the second portion 22 extends from the light incident surface 211 of the first portion 21 toward the bottom surface 222 of the lens 20, and is disposed around the light incident surface of the first portion 21. A cavity 23 for accommodating the light source is formed between the light incident surface 211 of the first portion 21 and the light incident surface 221 of the second portion 22. The cavity 23 forms an opening in the bottom surface 222 of the lens 20.

When the light source is disposed on both the bottom surface 222 of the beam shaping lens 20 and the central axis L of the beam shaping lens 20, of the light beams emitted from the light source, the first portion 21 of the light beams having the emission angle smaller than the first threshold value is incident from the light incident surface 211 of the first portion 21 and then emitted from the light emitting surface 212 of the first portion 21, and the second portion of the light beams having the emission angle not smaller than the first threshold value is incident from the light incident surface 221 of the second portion 22 and then reflected by the reflecting surface 223 to form light beams having a certain divergence angle. The light beam with a certain divergence angle is collimated and emitted through the light emitting surface 224 of the second portion 22.

Fig. 3 is a schematic cross-sectional view of another embodiment of a beam-shaping lens according to an embodiment of the present invention, as shown in fig. 3. The lens cross-sectional view in this embodiment is similar to the lens cross-sectional view shown in fig. 1. In contrast to the sectional view shown in fig. 1, in the second area of the sectional view shown in fig. 1:

the light emitting surface of the second region 32 in this embodiment includes a first segment 321 and a second segment 322, wherein the first segment 321 is closer to the first region 31 than the second segment 322. The first section 321 and the second section 322 are respectively smooth curved surfaces, wherein the first section 321 is recessed toward the bottom surface 33 of the beam shaping lens compared with the second section 322, so that a step is formed on the light-emitting surface of the second region 32.

The light-emitting surface of the second region 32 further comprises a third segment 323 for connecting the first segment 321 and the second segment 322. In some embodiments, the third segment 323 is substantially parallel to the central axis L of the beam shaping lens. In some embodiments, the light emitting surface of the second region 32 further includes a fourth segment 324 for connecting the first segment 321 and the light emitting surface of the first region 31. In some embodiments, the first segment 321 is directly connected to the light emitting surface 312 of the first region 31.

In some embodiments, the first segment 321 of the light-emitting surface of the second region 32 starts from an end close to the central axis L of the lens, extends in a direction away from the central axis L and away from the bottom surface 33, and then extends in a direction away from the central axis L and close to the bottom surface 33. In some embodiments, the length of the first segment 321 of the light exit surface of the second region from the end close to the central axis L of the lens to the direction away from the central axis L and the bottom surface 33 is at least 60% of the total length of the first segment 321.

In some embodiments, the first segment 321 of the light-emitting surface of the second region 32 starts from an end close to the central axis L of the lens and generally extends in a direction away from the central axis L and away from the bottom surface 33.

In some embodiments, the second segment 322 of the light-exiting surface of the second region 32 extends from an end close to the central axis L of the lens, generally in a direction away from the central axis L and away from the bottom surface 33. In some embodiments, the second segment 322 of the light-exiting surface of the second region 32 extends from an end close to the central axis L of the lens, generally in a direction away from the central axis L and close to the bottom surface 33.

In some embodiments, of the light beams incident from the light incident surface of the second region 32, a portion of the light beams having an exit angle between the first threshold and the fourth threshold enters the reflection surface 325 of the second region 32, is reflected by the reflection surface 325 to the second section 322 of the light exit surface of the second region 32, and is collimated by the second section 322 of the light exit surface; after the part of the light with the emitting angle larger than the fourth threshold enters the reflecting surface 325 of the second area 32, the part of the light is reflected to the first segment 321 of the light emitting surface of the second area by the reflecting surface 325, and is collimated by the first segment 321 of the light emitting surface and then emitted.

In some embodiments, the first threshold is between 20 degrees and 35 degrees. For example, the first threshold is 20 degrees, 25 degrees, 30 degrees, or 35 degrees. In some embodiments, the fourth threshold is between 50 degrees and 70 degrees. For example, the fourth threshold is 50 degrees, 55 degrees, 60 degrees, 65 degrees, 70 degrees or other values in the interval, which is not limited herein.

In some embodiments, the beam shaping lens is rotationally symmetric, i.e., the beam shaping lens is formed by rotating the lens cross-sectional view shown in fig. 3 about the central axis L.

Fig. 4 is a schematic perspective view of an embodiment of the beam shaping lens shown in fig. 3, the perspective view corresponding to the cross-sectional view shown in fig. 4. The beam-shaping lens 40 includes a first portion 41 formed by rotating a first region in the cross-sectional view shown in fig. 3, and a second portion 42 formed by rotating a second region (or a third region) in the cross-sectional view. The structure of the lens in this embodiment is similar to that of the lens shown in fig. 2. Unlike the lens shown in fig. 2, compared to the light-emitting surface on the second portion in the lens shown in fig. 2, an annular area on the light-emitting surface 411 of the second portion 42 close to the first portion 41 is recessed toward the bottom surface 44 of the lens, so that a step around the central axis L of the lens is formed on the light-emitting surface of the second portion 42. Specifically, the light-emitting surface of the second portion 42 includes a first annular range 421 and a second annular range 422, wherein the first annular range 421 is formed by the first segment 321 on the light-emitting surface in fig. 3 surrounding the central axis L of the lens, and the second annular range 422 is formed by the second segment 322 on the light-emitting surface in fig. 3 surrounding the central axis L of the lens. As can be seen from the cross-sectional view of fig. 3, the first annular area 421 is recessed toward the bottom surface 44 of the lens compared to the second annular area 422.

In some embodiments, the light emitting surface of the second portion 42 further includes a third annular range 423 located between the first annular range 421 and the second annular range 422, for connecting the first annular range 421 and the second annular range 422. In some embodiments, the third annular region 423 is substantially parallel to the central axis L of the lens.

The structure of the lens in this embodiment can further reduce the volume of the lens than the lens shown in fig. 2.

Fig. 5 is a schematic cross-sectional view of another embodiment of a beam-shaping lens according to an embodiment of the present invention, as shown in fig. 5. The cross section of the beam-shaping lens 50 includes a first region 51, and a second region 52 and a third region 53 respectively located on both sides of the first region 51. Wherein the second region 52 has the same structure as the third region 53 and is symmetrical about the central axis L of the beam-shaping lens. The second region and the third region are described below by taking the second region 52 as an example.

The first region 51 includes an incident surface 511 and an emergent surface 512 opposite to each other, and the second region 52 includes an incident surface 521, a bottom surface 522, a reflecting surface and an emergent surface. The incident surface 511 of the first region 51 generally extends in the transverse direction. The light incident surface 511 of the first region 51 may be a straight line or a curved line, which is not limited herein. The incident surface 521 of the second region 52 and the incident surface of the third region 53 are respectively located at two sides of the incident surface of the first region 51, and extend from one end of the incident surface 511 of the first region 51 in the longitudinal direction. A cavity 54 is formed between the entrance face 511 of the first region 51, the entrance face 521 of the second region 52 and the entrance face of the third region 53.

The light-emitting surface of the second region 52 and the light-emitting surface of the third region 53 respectively extend outward and generally upward from both sides of the light-emitting surface 512 of the first region 51. The reflection surface of the second region 52 is disposed opposite to the light incident surface 521 of the second region 52, and is used for reflecting the light beam from the light incident surface 521 to the light emergent surface of the second region 52 for emission.

The reflective surface of the second region 52 includes a first segment 523 and a second segment 524, where the first segment 523 is connected to the bottom surface 522, and the second segment 524 is located on the other side of the first segment 523 opposite to the bottom surface 522. The first segment 523 of the reflecting surface is recessed toward the central axis L of the beam-shaping lens 50 as compared with the second segment 524, so that a step is formed on the reflecting surface. The reflective surface also includes a third segment 525 for connecting the first and second segments. In some embodiments, the third segment 525 of the reflective surface extends generally in the lateral direction. In some embodiments, the third segment 325 of the reflective surface has an average angle with the central axis L of the beam shaping lens 50 of no less than 80 degrees.

The light-emitting surface of the second region 52 includes a first segment 526 and a second segment 527, wherein the first segment 526 is closer to the light-emitting surface 512 of the first region 51 than the second segment 527. The first section 526 on the light exit surface is recessed toward the bottom surface 522 of the beam-shaping lens 50 compared to the second section 527, and the light exit surface 512 of the first region 51 is recessed toward the bottom surface 522 of the beam-shaping lens 50 compared to the first section 526 of the light exit surface of the second region 52. The light exit surface of the second region 52 further comprises a third section 528 for connecting the first section 526 with the light exit surface of the first region 51, and a fourth section 529 for connecting the first section 526 with the second section 527. In some embodiments, the second section 527 and the fourth section 529 of the light exiting surface of the second region 52 extend generally in the longitudinal direction. In some embodiments, the second segment 527 and the fourth segment 529 of the light-exiting surface of the second region 52 respectively have an average included angle with the central axis L of the beam-shaping lens of not more than 10 degrees.

When the light source is disposed on both the bottom surface 522 of the beam shaping lens 50 and the central axis L of the beam shaping lens 50, among the light beams emitted from the light source: a first part of light with an emission angle smaller than a first threshold value is emitted from the light emitting surface 512 of the first region 51 after being incident from the light incident surface 511 of the first region 51; of the light flux of the second partial light having the emission angle not smaller than the first threshold value, a portion on one side of the central axis L enters from the light entrance surface 521 of the second region 52, and a portion on the other side of the central axis L enters from the light entrance surface of the third region 53.

Of the light beams incident from the light incident surface 521 of the second region 52, part of the light beams with the exit angle between the first threshold value and the fourth threshold value enters the second section 524 of the reflection surface of the second region 52, is reflected by the second section 524 to the second section 527 of the light exit surface of the second region 52, and is collimated by the second section 527 of the light exit surface and then exits; part of the light with the emitting angle larger than the fourth threshold enters the first segment 523 of the reflection surface of the second region 52, is reflected by the first segment 523 to the first segment 526 of the light emitting surface of the second region 52, and is collimated by the first segment 526 of the light emitting surface and then is emitted.

In some embodiments, the first threshold is between 20 degrees and 35 degrees. For example, the first threshold is 20 degrees, 25 degrees, 30 degrees, or 35 degrees. In some embodiments, the fourth threshold is between 50 degrees and 70 degrees. For example, the fourth threshold is 50 degrees, 55 degrees, 60 degrees, 65 degrees, 70 degrees or other values in the interval, which is not limited herein.

In some embodiments, the first segment 526 of the light-emitting surface of the second region 52 starts from an end close to the central axis L of the lens 50, generally extends in a direction away from the central axis L and away from the bottom surface 522, and then extends in a direction away from the central axis L and close to the bottom surface 522.

In some embodiments, the first segment 526 of the light exiting surface of the second region 52 extends from an end close to the central axis L of the lens 50, generally in a direction away from the central axis L and away from the bottom surface 522.

In some embodiments, the first segment 526 of the light exiting surface of the second region 52 extends from an end close to the central axis L of the lens 50, generally in a direction away from the central axis L and close to the bottom surface 522.

In some embodiments, the second segment 527 of the light exiting surface of the second region 52 extends from an end close to the central axis L of the lens 50, generally in a direction away from the central axis L and away from the bottom surface 522.

In some embodiments, in the cross-sectional view, the light incident surface 511 of the first region 51 is a straight line, and the light emitting surface 512 is a curved line. In some embodiments, the light incident surface 511 of the first region 51 is a curve, and the light emitting surface 512 is a straight line. In some embodiments, the light incident surface 511 and the light emitting surface 512 of the first region 51 are both straight lines or both curved lines.

In some embodiments, the beam shaping lens is rotationally symmetric, i.e., the beam shaping lens is formed by rotating the lens cross-sectional view shown in fig. 5 about the central axis L.

Fig. 6 is a perspective view of an embodiment of the beam shaping lens shown in fig. 5, which corresponds to a cross-sectional view, as shown in fig. 6. The beam-shaping lens includes a first portion 61 formed by rotating a first region in the cross-sectional view shown in fig. 5, and a second portion 62 formed by rotating a second region (or a third region) in the cross-sectional view shown in fig. 5. As can be seen from the cross-sectional view shown in fig. 5, the first portion 61 formed after rotation includes a light incident surface 611 and a light emitting surface 612 which are oppositely disposed, and the second portion 62 includes a light incident surface 621, a bottom surface 622, a reflection surface and a light emitting surface. The light incident surface 621 of the second portion 62 extends from the light incident surface 611 of the first portion 61 toward the bottom surface 622 of the lens 60, and is disposed around the light incident surface 611 of the first portion 61. A cavity 63 for accommodating a light source is formed between the light incident surface 611 of the first portion 61 and the light incident surface 621 of the second portion 62. The cavity 63 forms an opening in the bottom surface 622 of the lens 60.

When the light source is disposed on both the bottom surface 622 of the beam shaping lens 60 and the central axis L of the beam shaping lens 60, the first part 61 of the light emitted from the light source, which has an emission angle smaller than the first threshold value, is incident from the light incident surface 611 of the first part 61 and then is emitted from the light emitting surface 612 of the first part 61, and the second part 62 of the light, which has an emission angle not smaller than the first threshold value, is incident from the light incident surface 621 of the second part 62 and then is reflected by the reflection surface to form a light beam having a certain divergence angle. The light beam having a certain divergence angle is collimated and emitted through the light emitting surface of the second portion 62.

Wherein the reflective surface of the second portion 62 comprises a first range 623 and a second range 624, respectively, surrounding the central axis L of the beam shaping lens, the first range 623 being closer to the bottom surface 622 of the beam shaping lens 60 than the second range 624. The first range 623 is recessed from the second range 624 in the direction of the central axis L of the beam shaping lens 60 such that the reflection surface of the second portion 62 is stepped.

The reflecting surface of the second portion 62 further comprises a third annular area 625 connecting the first area 623 and said second area 624. In some embodiments, the third range 625 is substantially parallel to the bottom surface 622 of the beam shaping lens.

The light emitting surface of the second portion 62 includes a first range 626 surrounding the central axis L of the beam shaping lens 60 and a second range 627 surrounding the first range 626, wherein the first range 626 is recessed toward the bottom surface 622 of the beam shaping lens 60 compared with the second range 627, so that the light emitting surface of the second portion 62 is stepped. In some embodiments, the light emitting surface 612 of the first portion 61 is recessed toward the bottom surface 622 of the beam shaping lens 60 compared with the first range 626 of the light emitting surface of the second portion 62, so that the light emitting surface 612 of the first portion 61, the first range 626 of the light emitting surface of the second portion 62, and the second range 627 of the light emitting surface of the second portion 62 are generally located at different heights, respectively. In some embodiments, the light emitting surface of the second portion 62 further includes a third range 628 connecting the first range 626 and the light emitting surface 612 of the first portion 61, and a fourth range 629 connecting the first range 626 and the second range 627. In some embodiments, the second and fourth ranges 627 and 629 of the exit surface of the second portion 62 extend generally in the longitudinal direction. In some embodiments, the second range 627 and the fourth range 629 of the light exit surface of the second portion 62 respectively have an average included angle with the central axis L of the beam-shaping lens of not more than 10 degrees.

The first range 623 of the reflection surface of the second portion 62 is used for reflecting the light beam with the divergence angle between the first threshold and the fourth threshold in the second part of light to the first range 626 of the light exit surface of the second portion 62; and reflects the light beam with the divergence angle larger than the fourth threshold in the second part of the light beam entering the light incident surface of the second portion 62 to the second range 627 of the light exiting surface of the second portion 62. The light exit surface of the second portion 62 collimates the light beam from the reflection surface and emits the light beam.

In some embodiments, the first threshold is 35 degrees or less and 25 degrees or more. In some embodiments, the first threshold is 27 degrees or less and 32 degrees or more. For example, the first threshold is 20 degrees, 25 degrees, 30 degrees, or 35 degrees.

Several embodiments of the beam shaping lens of the present invention have been described above by way of example. As can be seen from the above embodiments, the beam-shaping lens in the present invention includes a first portion and a second portion surrounding the first portion. The first portion comprises a light incident surface and a light emergent surface which are oppositely arranged. The second portion comprises a light incident surface, a reflecting surface and a light emergent surface, wherein the light incident surface of the second portion surrounds the light incident surface of the first portion, and a cavity is formed between the light incident surface of the first portion and the light incident surface of the second portion.

And in the light beams emitted by the light source on the bottom surface of the light beam shaping lens and the central axis of the light beam shaping lens, a first part of light with an emitting angle smaller than a first threshold value is emitted from the light emitting surface of the first part after being incident from the light incident surface of the first part, a second part of light with an emitting angle not smaller than the first threshold value is incident from the light incident surface of the second part, is reflected into a light beam with a certain divergence angle by a reflecting surface and then is incident to the light emitting surface of the second part, and is collimated and emitted through the light emitting surface of the second part.

The aperture of the light-emitting surface of the second part is larger than that of the light-emitting surface of the first part. The aperture of the light-emitting surface of the first portion may refer to a distance between two endpoints of the light-emitting surface of the first portion on a cross section of the lens along the central axis, such as D1 shown in fig. 5. The aperture of the light-emitting surface of the second portion may refer to a distance between two endpoints of the light-emitting surface of the second portion on a cross section of the lens along the central axis, such as D2 shown in fig. 5.

In various embodiments of the invention, the lens may have different implementations.

In some embodiments, the light incident surface of the first portion may be a plane surface, and the light emergent surface is a curved surface. In some embodiments, the light incident surface of the first region is a curved surface, and the light emergent surface is a plane. In some embodiments, the light incident surface and the light emitting surface of the first region are both planar or both curved surfaces. The curved surface may be a free curved surface, or a spherical surface, an ellipsoid, or other curved surfaces, which is not limited herein.

In some embodiments, the light emitting surface of the second portion is a free-form surface, and is used for collimating and emitting the incident light beam.

In some embodiments, the reflective surface of the second portion may be a total internal reflection surface, or may be a surface coated with a reflective film, which is not limited herein.

In some embodiments, the second portion of light is reflected by the reflective surface of the second portion into a beam having a divergence angle between 4 degrees and 20 degrees (including 4 degrees and 20 degrees). In some embodiments, the second portion of light is reflected by the reflective surface of the second portion into a beam having a divergence angle between 4 degrees and 15 degrees. In some embodiments, the second portion of light is reflected by the reflective surface of the second portion into a beam having a divergence angle between 4 degrees and 10 degrees. The reflecting surface of the second part reflects the second part of light into a divergent light beam with a certain angle, so that the light beam can be incident on the light-emitting surface with a larger caliber. And the light-emitting surface of the second part is not a plane but a curved surface, and can collimate the light beam. According to the principle of conservation of etendue, the second portion has the light-emitting surface with a larger caliber, so that the divergence angle of light beams emitted from the light-emitting surface is smaller, and the light beam collimation effect is improved.

In some embodiments, the first portion is configured to shape at least 60% of the first portion of light into a beam having an exit angle not less than a second threshold, and the second portion is configured to shape at least 60% of the second portion of light into a beam having an exit angle not greater than the second threshold, such that the exit light of the light source forms a spot having a central area illuminance higher than an illuminance of a peripheral area surrounding the central area beyond a certain distance through the beam shaping lens.

In some embodiments, optionally, the second threshold is in the range of 2 to 10 degrees (including 2 and 10 degrees).

The aperture of the light-emitting surface of the second portion is larger than that of the first portion. In some embodiments, the diameter of the light exit surface of the second portion is greater than 3 times, 4 times, or 5 times the diameter of the light exit surface of the first portion. In some embodiments, the aperture of the light exit surface of the first portion is between 4mm and 6mm, and the aperture of the light exit surface of the second portion is between 28mm and 33 mm.

Thus, on the premise that the aperture of the beam shaping lens is kept constant, the aperture occupied by the light-emitting surface of the second portion is made as large as possible, the aperture occupied by the light-emitting surface of the first portion is made as small as possible, and the aperture occupied by the light-emitting surface of the first portion is made as small as possible according to the principle of conservation of etendue, so that the first portion can output a beam having a divergence angle as large as possible. Thus, the first part emits a beam which can be used as floodlight to irradiate a large range of short distances, and the second part emits a beam with a small divergence angle to irradiate a long distance. Therefore, the distance and the distance can be considered and mutually complemented.

In some embodiments, a ratio of an average distance between a bottom surface of the beam shaping lens and the light exit surface of the first portion to a height of the beam shaping lens is less than 0.3. In some embodiments, a ratio of an average distance between a bottom surface of the beam shaping lens and the light exit surface of the first portion to a height of the beam shaping lens is less than 0.4. This can reduce the volume of the beam shaping lens. The average distance between the bottom surface of the beam shaping lens and the light exit surface of the first portion may be a vertical distance between the center of the light exit surface of the first portion and the bottom surface of the beam shaping lens, an average value of vertical distances between points on the light exit surface of the first portion and the bottom surface of the beam shaping lens, a distance between a point of the bottom surface through which the central axis L of the beam shaping lens passes and a point of the light exit surface of the first portion, or a vertical distance between a highest point on the light exit surface of the first portion and the bottom surface of the beam shaping lens (for example, H1 shown in fig. 5), which is not limited herein. The height of the beam-shaping lens may refer to a distance between a highest point of the light exit surface of the second portion and the bottom surface (e.g., H2 in fig. 5).

In some embodiments, the average distance between the light exit surface of the first portion and the bottom surface of the beam shaping lens is between 5mm and 7 mm; the highest point of the light-emitting surface of the second part is located between 13mm and 16 mm.

Fig. 7 is a schematic structural diagram of a light source device according to an embodiment of the present invention. The light source device 70 includes a light emitting light source 71 and a beam shaping lens 72. The light emitting source 71 may be a Light Emitting Diode (LED) or other light sources with a divergence angle of the emitted light beam larger than 30 degrees, which is not limited herein. The beam shaping lens 72 may be any of the beam shaping lenses described above. The light-emitting source 71 may be located inside the cavity 721 of the beam shaping lens 72, or outside the cavity 721 of the beam shaping lens 72, and the light beam emitted from the light-emitting source 71 enters the cavity 721 through the cavity 721 at the opening of the bottom surface of the beam shaping lens 72, and enters the light incident surfaces of the first and second portions of the beam shaping lens 72, respectively.

In some embodiments, the light source arrangement 70 further comprises a carrier plate 73 for carrying the light emitting source 71. In some embodiments, the inner surface of the cavity 721 of the beam-shaping lens 72 is further provided with a limiting step 722, so that when the beam-shaping lens 72 is fixed on the light-emitting source 71, the periphery of the light-emitting source 71 just abuts against the limiting step 722. Such a construction facilitates the mutual positioning between the beam-shaping lens and the light-emitting source.

In some embodiments, the second portion of the beam-shaping lens is further provided with an outwardly extending fixation portion 723 on the periphery, which may be used to fix the beam-shaping lens and other components in the light source device to each other. Optionally, the fixing portion 723 is provided with a through hole 724, so that a screw passes through the through hole 724 to be fixed to other components.

In some embodiments, as shown in fig. 8, the fixing portion of the beam shaping lens is used to fix a heat sink fin 81 to the beam shaping lens and/or the light source.

In some embodiments, the light source device may be used in a flashlight, a searchlight, a mining lamp, or other types of lamps, without limitation.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A beam-shaping lens, comprising:

a first portion and a second portion surrounding the first portion;

the first part comprises a light inlet surface and a light outlet surface which are oppositely arranged, the second part comprises a light inlet surface, a reflecting surface and a light outlet surface, wherein the light outlet surface of the second part is non-planar, and the caliber of the light outlet surface of the second part is larger than that of the light outlet surface of the first part;

the light incident surface of the second portion is arranged around the light incident surface of the first portion, and a cavity is formed between the light incident surface of the first portion and the light incident surface of the second portion;

among light beams emitted by the light source on the bottom surface of the light beam shaping lens and the central axis of the light beam shaping lens, a first part of light with an emitting angle smaller than a first threshold value is emitted from the light emitting surface of the first part after being incident from the light incident surface of the first part, a second part of light with an emitting angle not smaller than the first threshold value is incident from the light incident surface of the second part, is reflected into a divergent light beam by the reflecting surface, is incident to the light emitting surface of the second part, and is collimated and emitted through the light emitting surface of the second part.

2. The beam-shaping lens of claim 1,

the first part is used for shaping at least 60% of the first part of light into light beams with the emergent angle not smaller than a second threshold value, and the second part is used for shaping at least 60% of the second part of light into light beams with the emergent angle not larger than the second threshold value, so that light spots with central area illumination higher than that of a peripheral area surrounding the central area are formed outside a specific distance after the emergent light of the light source passes through the light beam shaping lens.

3. The method of claim 1, wherein the light-emitting surface of the second portion is a convex curved surface extending outward from a periphery of the light-emitting surface of the first portion;

and/or the presence of a gas in the gas,

the reflecting surface of the second part is a smooth curved surface;

and/or the presence of a gas in the gas,

the reflection surface of the second portion includes a first range surrounding a central axis of the beam shaping lens, and a second range surrounding the first range, respectively; the first range is recessed toward a direction of a central axis of the beam shaping lens from the second range, so that a reflection surface of the second portion is stepped.

4. The beam-shaping lens of claim 3, wherein the reflective surface of the second portion further comprises a third annular extent for connecting the first extent and the second extent, the third extent being substantially parallel to the bottom surface of the beam-shaping lens.

5. The beam-shaping lens of claim 1 or 3, wherein the light-exiting surface of the second portion comprises a first range surrounding a central axis of the beam-shaping lens, and a second range surrounding the first range, wherein the first range is recessed in a direction toward the bottom surface of the beam-shaping lens compared to the second range, such that the light-exiting surface of the second portion is stepped.

6. The beam-shaping lens of claim 5, wherein the first extent of the reflective surface is configured to reflect a portion of the second portion of light from the light-incident surface of the second portion to the first extent of the light-emitting surface of the second portion;

the second range of the reflection surface is used for reflecting a part of the second part of light from the light incident surface of the second part to the second range of the light emergent surface of the second part.

7. The beam-shaping lens of claim 6 wherein at least some of the light beams emitted from the light source with an angle of incidence between 30 and 60 degrees are incident on the reflective surface in a second range;

and/or the presence of a gas in the gas,

at least part of light beams with the emergent angle not less than 60 degrees in the light beams emitted by the light source enter the first range of the reflecting surface.

8. The beam-shaping lens of claim 5, wherein the light-emitting surface of the first portion is recessed in a direction toward the bottom surface of the beam-shaping lens compared to the first extent of the second portion, such that the light-emitting surface of the first portion, the first extent of the light-emitting surface of the second portion, and the second extent of the light-emitting surface of the second portion are located at different heights, respectively.

9. The beam-shaping lens of claim 1, wherein a diameter of the light-exiting surface of the second portion is greater than 4 times a diameter of the light-exiting surface of the first portion;

and/or the presence of a gas in the gas,

the ratio of the average distance between the bottom surface of the beam shaping lens and the light-emitting surface of the first part to the height of the beam shaping lens is less than 0.3.

10. An illuminating lamp is characterized by comprising

A beam-shaping lens according to any one of claims 1 to 12;

the light source bracket and the light source fixed on the light source bracket;

the beam shaping lens is fixed on the light source bracket, so that the light source is positioned in a cavity of the beam shaping lens.

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