CN109780506B

CN109780506B - Light distribution module

Info

Publication number: CN109780506B
Application number: CN201811061681.7A
Authority: CN
Inventors: 施威文; 王世昌
Original assignee: Lite On Technology Corp
Current assignee: Lite On Technology Corp
Priority date: 2017-11-15
Filing date: 2018-09-12
Publication date: 2022-01-25
Anticipated expiration: 2038-09-12
Also published as: TWI770275B; CN109780506A; TW201923303A

Abstract

A light distribution module for controlling light distribution of a light source comprises a lens and an optical housing. The lens is provided with a first light incident surface, a first light emergent surface opposite to the first light incident surface and an accommodating groove positioned on one side of the first light incident surface, wherein the accommodating groove is used for accommodating the light source. The optical outer cover covers the lens and is provided with a second light incident surface and a second light emergent surface which are opposite to each other, wherein the second light incident surface is positioned between the first light emergent surface and the second light emergent surface, and the second light incident surface is provided with a plurality of sub-curved surfaces. The junction of the adjacent sub-curved surfaces presents a turning appearance relative to the sub-curved surfaces.

Description

Light distribution module

Technical Field

The present disclosure relates to optical modules, and particularly to a light distribution module.

Background

In conventional lighting device designs, the light source is disposed on the optical housing to produce the desired light shape. In order to meet the setting regulations of lighting devices in different countries and different lighting requirements in different regions, the same lighting device often needs to design several or even dozens of optical housings to meet the setting regulations and the lighting requirements in different regions.

However, lighting devices for road lighting tend to require long development and are costly. Furthermore, the need for more than one lighting device also means more maintenance costs. Therefore, manufacturers of lighting devices for road lighting need to develop lighting devices that can reduce the number of lighting devices to be developed and meet various national regulations and various requirements.

Disclosure of Invention

The invention provides a light distribution module, which can reduce the development quantity of the light distribution module.

The embodiment of the invention provides a light distribution module for controlling light distribution of a light source, which comprises a lens and an optical housing. The lens is provided with a first light incident surface, a first light emergent surface opposite to the first light incident surface and an accommodating groove positioned on one side of the first light incident surface, wherein the accommodating groove is used for accommodating the light source. The optical outer cover covers the lens and is provided with a second light incident surface and a second light emergent surface which are opposite to each other, wherein the second light incident surface is positioned between the first light emergent surface and the second light emergent surface, and the second light incident surface is provided with a plurality of sub-curved surfaces. The junction of the adjacent sub-curved surfaces presents a turning appearance relative to the sub-curved surfaces. One of the lens and the optical housing generates a first optical shape that is rotationally symmetric or non-rotationally symmetric, and the other of the lens and the optical housing generates a second optical shape that is rotationally symmetric.

In view of the above, the light distribution module in the embodiment of the invention includes a lens and an optical cover, one of the lens and the optical cover generates a first light shape that is rotationally symmetric or non-rotationally symmetric, and the other of the lens and the optical cover generates a second light shape that is rotationally symmetric. Therefore, the light distribution module of the invention can generate the required light shape through the combination of the lens and the optical outer cover, thereby greatly reducing the design quantity of the optical outer cover.

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1A is a schematic side view of an illumination device according to a first embodiment of the invention.

Fig. 1B is a schematic cross-sectional view of the lighting device of fig. 1A cut along the optical axis a.

Fig. 2A to 2C are schematic diagrams of three sub-curved surfaces of the optical housing in the embodiment of the invention.

Fig. 3A to 3B are schematic perspective views of a lens according to an embodiment of the invention.

Fig. 3C and 3D are schematic cross-sectional views of the lens of fig. 3B along the second long axis B2 and the first long axis B1, respectively.

Fig. 4A to 4B are schematic perspective views of a lens according to another embodiment of the invention.

Fig. 4C and 4D are schematic cross-sectional views of the lens of fig. 4B along the longitudinal direction B3 and the transverse direction B4, respectively.

Fig. 5A to 5B are schematic perspective views of a lens according to another embodiment of the invention.

Fig. 5C and 5D are schematic cross-sectional views of the lens of fig. 5B along the longitudinal direction B3 and the transverse direction B4, respectively.

Fig. 6A to 6B are schematic perspective views of a lens according to still another embodiment of the invention.

Fig. 6C is a schematic cross-sectional view of the lens of fig. 6B.

Fig. 7A to 7B are schematic perspective views of an optical housing according to an embodiment of the invention.

Fig. 7C is a cross-sectional schematic view of the optical housing of fig. 7B.

Fig. 7D is a schematic top view of the optics housing of fig. 7A.

Fig. 8A to 8B are schematic perspective views of an optical housing according to another embodiment of the invention.

Fig. 8C and 8D are schematic cross-sectional views of the optical housing of fig. 8B along the transverse width direction C4 and the longitudinal direction C3, respectively.

Fig. 8E is a schematic top view of the optics housing of fig. 8A.

Fig. 9A to 9B are schematic perspective views of an optical housing according to another embodiment of the invention.

Fig. 9C and 9D are schematic cross-sectional views of the optical housing of fig. 9B along the transverse width direction C4 and the longitudinal direction C3, respectively.

Fig. 9E is a schematic top view of the optics housing of fig. 9A.

FIG. 10 is a diagram illustrating a light shape distribution of a light source according to an embodiment of the present invention.

Fig. 11A and 11B are light shape distribution diagrams of the light source of fig. 10 passing through the lens of fig. 3A and generated in the first long axis B1 direction and the second long axis B2 direction, respectively.

FIGS. 11C and 11D are light shape distribution diagrams of the light shapes of FIGS. 11A and 11B after passing through the optical housing of FIG. 7A, respectively.

FIG. 12A is a light profile generated by the light source of FIG. 10 after passing through the lens of FIG. 6A.

FIG. 12B is a graph of the light shape distribution produced after the light shape of FIG. 12A passes through the optical housing of FIG. 7A.

Fig. 13A is an isolux plot of the light distribution produced by the light source of fig. 10 after passing through the lens of fig. 3A.

FIG. 13B is an isophote graph of the light distribution of FIG. 13A after the light distribution passes through the optical housing of FIG. 7A.

Fig. 14A is an isophote plot of the light distribution produced by the light source of fig. 10 after passing through the lens of fig. 6A.

FIG. 14B is an isophote graph of the light distribution of FIG. 14A after the light distribution passes through the optical housing of FIG. 7A.

FIG. 15A is an isolux plot of the light distribution produced by the light source of FIG. 10 after passing through the lens of FIG. 4A and through the optical housing of FIG. 7A.

FIG. 15B is an isolux plot of the light distribution produced by the light source of FIG. 10 after passing through the lens of FIG. 5A and then through the optical housing of FIG. 7A.

FIG. 16A is an isolux plot of the light distribution produced by the light source of FIG. 10 after passing through the lens of FIG. 6A and through the optical housing of FIG. 8A.

FIG. 16B is an isolux plot of the light distribution produced by the light source of FIG. 10 after passing through the lens of FIG. 6A and through the optical housing of FIG. 9A.

Fig. 17 is a schematic cross-sectional view of a lighting device according to a second embodiment of the invention.

Fig. 18 is a schematic cross-sectional view of a lighting device according to a third embodiment of the present invention.

Fig. 19 is a schematic cross-sectional view of a lighting device according to a fourth embodiment of the invention.

Fig. 20 is a schematic perspective view illustrating an assembly structure of a lighting device according to an embodiment of the invention.

Detailed Description

Fig. 1A is a schematic side view of an illumination device according to a first embodiment of the invention. Fig. 1B is a schematic cross-sectional view of the lighting device of fig. 1A cut along the optical axis a. Fig. 2A to 2C are schematic diagrams of three sub-curved surfaces of the optical housing in the embodiment of the invention. Fig. 3A to 3B are schematic perspective views of a lens according to an embodiment of the invention. Fig. 3C and 3D are schematic cross-sectional views of the lens of fig. 3B along the second long axis B2 and the first long axis B1, respectively. Fig. 4A to 4B are schematic perspective views of a lens according to another embodiment of the invention. Fig. 4C and 4D are schematic cross-sectional views of the lens of fig. 4B along the longitudinal direction B3 and the transverse direction B4, respectively. Fig. 5A to 5B are schematic perspective views of a lens according to another embodiment of the invention. Fig. 5C and 5D are schematic cross-sectional views of the lens of fig. 5B along the longitudinal direction B3 and the transverse direction B4, respectively. Fig. 6A to 6B are schematic perspective views of a lens according to still another embodiment of the invention. Fig. 6C is a schematic cross-sectional view of the lens of fig. 6B. Fig. 7A to 7B are schematic perspective views of an optical housing according to an embodiment of the invention. Fig. 7C is a cross-sectional schematic view of the optical housing of fig. 7B. Fig. 7D is a schematic top view of the optics housing of fig. 7A. Fig. 8A to 8B are schematic perspective views of an optical housing according to another embodiment of the invention. Fig. 8C and 8D are schematic cross-sectional views of the optical housing of fig. 8B along the transverse width direction C4 and the longitudinal direction C3, respectively. Fig. 8E is a schematic top view of the optics housing of fig. 8A. Fig. 9A to 9B are schematic perspective views of an optical housing according to another embodiment of the invention. Fig. 9C and 9D are schematic cross-sectional views of the optical housing of fig. 9B along the transverse width direction C4 and the longitudinal direction C3, respectively. Fig. 9E is a schematic top view of the optics housing of fig. 9A.

For convenience of illustration, the weft threads of the optical cover in some of the figures are only schematically illustrated, and not all of them are drawn, for example, the weft threads of the optical cover in fig. 7B are only schematically illustrated by three weft threads.

Referring to fig. 1A and fig. 1B, the illumination device 10 of the present embodiment includes a light source 110 and a light distribution module 100. The light distribution module 100 is used to control the light distribution of the light source 110. The light distribution module 100 includes a lens 120 and an optical cover 130. The lens 120 has a first light incident surface 121, a first light emitting surface 122 opposite to the first light incident surface 121, and an accommodating recess 123 located at one side of the first light incident surface 121, wherein the accommodating recess 123 is used for accommodating the light source 110. In the present embodiment, the lens 120 of fig. 1B is the lens 120D of fig. 6A. However, the invention is not limited thereto, and the lens 120 may be the lens 120A of fig. 3A, the lens 120B of fig. 4A, the lens 120C of fig. 5A, or may be replaced by other shapes of lenses as required.

The optical cover 130 covers the lens 120 and has a second light incident surface 131 and a second light emitting surface 132 opposite to each other, wherein the second light incident surface 131 is located between the first light emitting surface 122 and the second light emitting surface 132, and the second light incident surface 131 has a plurality of sub-curved surfaces 133. The

boundaries

133f and 133g of the adjacent sub-curved surfaces 133 present a turning appearance relative to the sub-curved surfaces 133. One of the lens 120 and the optics housing 130 produces a first light shape that is rotationally symmetric or non-rotationally symmetric, and the other of the lens 120 and the optics housing 130 produces a second light shape that is rotationally symmetric. In this embodiment, the optical housing 130 of fig. 1B is the optical housing 130A of fig. 7A. However, the invention is not limited thereto, and the optical housing 130 may be the optical housing 130B of fig. 8A, the optical housing 130C of fig. 9A, or other optical housing modifications as required.

In the present embodiment, the light source 110 is, for example, a Light Emitting Diode (LED). However, the present invention is not limited thereto, and the light source 110 may be a laser diode, an incandescent lamp, a mercury lamp, a halogen lamp, a fluorescent lamp, or other suitable light sources.

In the present embodiment, the lens 120 may be made of Polycarbonate (PC), polymethyl methacrylate (pmma), silica gel, or optical glass, and is preferably made of acryl, which has high light emitting efficiency and can be manufactured by injection molding. The optical cover 130 may be made of suitable materials such as polycarbonate, acryl, silica gel, or glass, preferably polycarbonate, and has better weather resistance and can be manufactured by injection molding. In addition, for the large-sized light distribution module 100, the optical cover 130 may also be made of optical glass.

Furthermore, in the present embodiment, a diffusing agent may be further added to the optical housing 130 to enhance the ability of the optical housing 130 to homogenize the light. The second light emitting surface 132 of the optical housing 130 may be coated with a Hard Coating (Hard Coating) for increasing the structural strength of the optical housing 130.

The following will next describe specific features of the optical housing 130 of the lighting device 10 in an embodiment of the present invention.

Referring to fig. 1B, in the present embodiment, a thickness H1 from the center of the sub-curved surface (e.g., the sub-curved surface 133a) near the edge of the optical housing 130 to the second light emitting surface 132 of the optical housing 130 of the lighting device 10 is greater than a thickness H2 from the center of the sub-curved surface (e.g., the sub-curved surface 133B) near the center of the optical housing 130 to the second light emitting surface 132. The distance between each sub-curved surface 133 and the second light-emitting surface 132 decreases from one end close to the edge of the optical housing 130 to one end close to the center of the optical housing 130.

In addition, the boundary 133f of the sub-curved surfaces 133 adjacent to each other in the direction of the optical axis a of the optical cover 130 on the second light incident surface 131 of the optical cover 130 is in a ridge shape (for example, fig. 1B, 2A to 2C, and 7D, where fig. 7D can clearly show that the boundary 133f is in a ridge shape), and the boundary 133g of the sub-curved surfaces adjacent to each other in the direction from the edge of the optical cover 130 to the center of the optical cover 130 on the second light incident surface 131 of the optical cover 130 has a step difference (for example, fig. 1B, 2A to 2C, and 7C, where fig. 1B and 7C can clearly show that the boundary 133g has a step difference).

It should be noted that, compared to the Fresnel lens (Fresnel lens) with a continuous smooth surface along the direction of the optical axis, the second incident surface 131 of the optical housing 130 of the embodiment of the present invention includes a plurality of sub-curved surfaces 133, wherein the boundary 133f of the adjacent sub-curved surfaces 133 along the direction of the optical axis a of the optical housing 130 is in a ridge shape. Therefore, the structure of the second light incident surface 131 of the optical housing 130 of the embodiment of the invention is different from that of the fresnel lens.

In addition, in the embodiment, the sub-curved surface 133 of the optical housing 130 has the function of homogenizing the light distribution, but the invention is not limited thereto, and the sub-curved surface 133 can also be designed to concentrate the light or generate other light shapes as required. The following will describe in detail an embodiment in which the sub-curved surface 133 homogenizes the light distribution.

Referring to fig. 2A to 2C, first, a dotted line in fig. 2A and 2B indicates a connection line at a ridge of a boundary 133f between adjacent sub-curved surfaces 133C and 133d of the sub-curved surface 133C and the sub-curved surface 133d, and another dotted line indicates an extension line of a point where the respective curved surfaces of the sub-curved surface 133C and the sub-curved surface 133d have the shortest distance from the second light emitting surface 132, wherein a distance between two dotted lines of the sub-curved surface 133C is 0.5 mm, a distance between two dotted lines of the sub-curved surface 133d is 1.0 mm, and an included angle between a lowest point of the curved surface of the sub-curved surface 133e and a highest point of the curved surface of fig. 2C is 60 degrees.

Watch 1

	Divergence range	Divergence effect
			Sub-curved surface 133c	32 degree	Is low in
Sub-curved surface 133d	98 degree	In
			Sub-curved surface 133e	110 degree	Height of

The first table shows the divergence effect of the

sub-curved surfaces

133c, 133d and 133e, specifically, the light source 110 is directed to the 45-degree direction of the central axis B to output the light of the light source 110 to the optical housing 140, wherein the output angle range of the light source 110 is 5 degrees. Therefore, the sub-curved surface 133c diverges the range of 5 degrees to 32 degrees, and its divergence effect is low; the sub-curved surface 133d diverges the range of 5 degrees to 98 degrees, with a medium divergence effect; while the sub-curved surface 133e diverges the range of 5 degrees to 110 degrees, the divergence effect is high. Therefore, the sub-curved surface 133 of the optical housing 130 can be designed to be one of the

sub-curved surfaces

133c, 133d and 133e to generate a desired light shape or a divergence effect according to environmental requirements, but the invention is not limited thereto, and the sub-curved surface 133 of the optical housing 130 can also be a combination of the

sub-curved surfaces

133c, 133d and 133e to generate other specific light shapes.

Therefore, compared to the fresnel lens which only has the function of focusing light, the optical housing 130 of the embodiment of the invention can generate the required light shape distribution according to the structure of the sub-curved surface 133, and is not limited to the light shape distribution which concentrates or disperses the light.

One of the lens 120 and the optical housing 130 generates a first optical shape that is rotationally symmetric or non-rotationally symmetric, and the other of the lens 120 and the optical housing 130 generates a second optical shape that is rotationally symmetric. Specifically, an embodiment in which a rotationally symmetric or non-rotationally symmetric first light shape is produced for lens 120, and optical housing 130 produces a rotationally symmetric second light shape; alternatively, the optical housing 130 produces a first optical shape that is rotationally symmetric or non-rotationally symmetric, and the lens 120 produces an embodiment of a second optical shape that is rotationally symmetric.

For example, in fig. 3A to 6C, the first optical shape rotationally symmetric or non-rotationally symmetric generated by the lens 120A to 120D is an embodiment in which the first optical shape rotationally symmetric or non-rotationally symmetric generated by the lens 120A, the first optical shape rotationally symmetric generated by the lens 120B, the first optical shape rotationally symmetric generated by the lens 120C, and the first optical shape axially symmetric generated by the lens 120D are respectively generated by the lens 120A, the first optical shape rotationally symmetric or rotationally symmetric generated by the optical housing 130, and the second optical shape rotationally symmetric generated by the optical housing 130 is respectively generated by the lens 120A and the second optical shape rotationally symmetric generated by the optical housing 130, for example, the second optical shape rotationally symmetric generated by the optical housing 130A in fig. 7A to 7C.

In the present specification, "rotational symmetry" means that after a figure is rotated by an angle of less than 360 degrees around a symmetry axis, the figure coincides with the figure before the rotation, and the figure is a rotationally symmetric figure. For example, a square is a 90 degree rotationally symmetric pattern (since after every 90 degrees rotation of a square, the pattern will coincide with before rotation), a rectangle is a 180 degree rotationally symmetric pattern, and a triangle is a 120 degree rotationally symmetric pattern. In addition, "axial symmetry" means that after the figure rotates around the symmetry axis by any angle, the figure is coincident with the figure before the rotation, that is, the axial symmetry is rotational symmetry of any angle, and the axially symmetric circle is, for example, a circle.

First, referring to fig. 3A to 3D, in the present embodiment, the lens 120A has a first long axis B1 in a direction perpendicular to the central axis B of the light emitted by the light source 110, the accommodating recess 123 has a second long axis B2 in a direction perpendicular to the central axis B of the light emitted by the light source 110, the direction of the first long axis B1 is different from the direction of the second long axis B2, and the lens 120A generates a first non-rotationally symmetric light shape. In the embodiment, the first long axis B1 is perpendicular to the second long axis B2, the first light emitting surface 122 is not mirror-symmetric in a direction perpendicular to the first long axis B1, and the receiving groove 123 is not mirror-symmetric in a direction of the second long axis B2. In addition, in the present embodiment, the first light emitting surface 122 is mirror-symmetric in the direction perpendicular to the second long axis B2, and the receiving groove 123 is mirror-symmetric in the direction of the first long axis B1.

Referring to fig. 4A to 4D, the lens 120B in the present embodiment has a longitudinal direction B3 and a transverse direction B4. In fig. 4A and 4B, the protrusions on the first light emitting surface 122 are shown by solid lines, and the recesses are shown by dotted lines. That is, the first light emitting surface 122 has the cross-shaped protrusion 124, and the extending direction of the orthogonal projection 124' of the cross-shaped protrusion 124 on the reference plane (for example, on the xz plane of fig. 3A) perpendicular to the optical axis C of the lens 120B is inclined with respect to the longitudinal direction B3 and the transverse width direction B4. In fig. 4A, the protrusions on the first light incident surface 121 are illustrated by solid lines, and the recesses are illustrated by dotted lines. That is, the first light incident surface 121 has the cross-shaped recess 125, and the extending direction of the orthographic projection 124' of the cross-shaped recess 125 on the reference plane (for example, on the xz plane in fig. 4A) is inclined with respect to the longitudinal direction B3 and the lateral direction B4. In the present embodiment, the longitudinal direction B3 and the transverse direction B4 of the lens 120B are perpendicular to each other, so that the lens 120B generates a first light shape with rotational symmetry (e.g., 180-degree rotational symmetry); in other embodiments, the longitudinal direction B3 and the transverse direction B4 of the lens 120B are not perpendicular to each other, so that the lens 120B can generate the first optical shape without rotational symmetry.

Referring to fig. 5A to 5D, the lens 120C in the present embodiment has a longitudinal direction B3 and a transverse direction B4. In fig. 5A and 5B, the protrusions on the first light emitting surface 122 are shown by solid lines, and the recesses are shown by dotted lines. That is, the first light emitting surface 122 has a cross-shaped protrusion 126, and an orthogonal projection 126' of the cross-shaped protrusion 126 on a reference plane (e.g., on the xz plane of fig. 5A) perpendicular to the optical axis C of the lens 120C extends in the same direction as the longitudinal direction B3 and the transverse direction B4. In fig. 5A, the protrusions on the first light incident surface 121 are illustrated by solid lines, and the recesses are illustrated by dotted lines. That is, the first light incident surface 121 has the cross-shaped recess 127, and an orthogonal projection 126' of the cross-shaped recess 127 on a reference plane (e.g., on the xz plane of fig. 5A) extends in the same direction as the longitudinal direction B3 and the lateral direction B4. In the present embodiment, the longitudinal direction B3 and the transverse direction B4 of the lens 120C are perpendicular to each other, so that the lens 120C generates a first light shape with rotational symmetry (e.g., 180-degree rotational symmetry); in other embodiments, the longitudinal direction B3 and the transverse direction B4 of the lens 120C are not perpendicular to each other, so that the lens 120C can generate the first optical shape without rotational symmetry.

Referring to fig. 6A to 6C, the first light incident surface 121 and the first light emitting surface 122 of the lens 120D in the present embodiment are axisymmetric, wherein the side surface 128 of the first light incident surface 121 is steeper as the side surface is closer to the vertex 129 of the first light emitting surface 122.

Referring to fig. 7A to 7C, in the present embodiment, the second light emitting surface 131 of the optical housing 130A is axisymmetric, wherein the sub-curved surfaces 133 are annularly arranged in multiple layers around the optical axis a of the optical housing 130A, and the optical housing 130A generates a rotationally symmetric second light shape.

Based on the lenses 120A-120D of fig. 3A-6C described above, a first light shape that is rotationally symmetric or non-rotationally symmetric can be generated, and the optical housing 130A of fig. 7A-7C generates a second light shape that is rotationally symmetric. Therefore, the light distribution module 100 of the present embodiment can select one of the four lenses 120A-120D to be combined with the optical cover 130A according to the requirement, that is, the lighting device 10 of the present embodiment can combine the lighting devices 10 with four different light shapes. It is worth mentioning that the lens 120D can generate an axisymmetric light shape, and the optical housing 130A can also generate a rotationally symmetric light shape, so that in the combination of the lens 120D and the optical housing 130A, the lens 120D can generate a first light shape (or a second light shape) and the optical housing 130A can generate a second light shape (or a first light shape) that are rotationally symmetric.

The lens 120 generates the second light shape with rotational symmetry, for example, the lens 120D in fig. 6A to 6C can generate the second light shape with axial symmetry, and the optical housing 130 generates the first light shape with rotational symmetry or non-rotational symmetry, for example, the

optical housings

130B and 130C in fig. 8A to 9E can generate the first light shape with mirror symmetry.

First, referring to fig. 6A to 6C, the lens 120D of the present embodiment can generate an axisymmetric second light shape, and the same features can be referred to the above description, and thus are not repeated.

Referring to fig. 8A to 9E, the

optical housings

130B and 130C in the present embodiment have a longitudinal direction C3 and a transverse direction C4. The

optical housings

130B and 130C are mirror symmetric in the longitudinal direction C3 and non-mirror symmetric in the transverse direction C4, and the

optical housings

130B and 130C generate a first optical shape that is non-rotationally symmetric, wherein the sub-curved surfaces 133 are mirror symmetric in the longitudinal direction C3 and non-mirror symmetric in the transverse direction C4. The plurality of layers (e.g., the sub-curved surfaces 133B) arranged in a ring shape near the centers of the

optical housings

130B and 130C are in a heart-shaped ring shape. In addition, in the present embodiment, the optical housing 130B of fig. 8A is different in height from the optical housing 130C of fig. 9A. That is, the thickness of the lighting device with the optical housing 130B of fig. 8A is greater than the thickness of the lighting device with the optical housing 130C of fig. 9A.

Based on the lens 120D shown in fig. 6A to 6C, the second optical shape can be generated in an axisymmetric manner, and the

optical housings

130B and 130C shown in fig. 8A to 9E can generate the first optical shape in a mirror symmetry manner. Therefore, the light distribution module 100 of the present embodiment can select one of the two

optical housings

130B and 130C to be combined with the lens 120D according to the requirement, that is, the light distribution module 100 of the present embodiment can combine two light distribution modules 100 with different light shapes.

It should be noted that, according to the above embodiment, there are four types of embodiments in which the lens has the first light shape and the optical cover has the second light shape, and there are two types of embodiments in which the lens has the second light shape and the optical cover has the first light shape, so that six light distribution modules 100 having different light shapes can be combined respectively. However, the present invention is not limited thereto, and the width-to-height ratio of the optical housing can also be designed according to the actual requirement of light shape or light distribution.

The light distribution characteristics that can be generated by the lens 120 and the optical housing 130 according to the above-described embodiments of the present invention are described, followed by the description of the implementation of the optical housing at different width to height ratios.

FIG. 10 is a diagram illustrating a light shape distribution of a light source according to an embodiment of the present invention. Fig. 11A and 11B are light shape distribution diagrams of the light source of fig. 10 passing through the lens of fig. 3A and generated in the first long axis B1 direction and the second long axis B2 direction, respectively. FIGS. 11C and 11D are light shape distribution diagrams of the light shapes of FIGS. 11A and 11B after passing through the optical housing of FIG. 7A, respectively. FIG. 12A is a light profile generated by the light source of FIG. 10 after passing through the lens of FIG. 6A. FIG. 12B is a graph of the light shape distribution produced after the light shape of FIG. 12A passes through the optical housing of FIG. 7A.

Referring to fig. 10 to 11D, the light source of fig. 10 is a light emitting diode, and it can be seen from fig. 10 that the light shape of the selected light source is more concentrated, so that the ability of the lens 120 and the optical housing 130 to generate light shapes can be detected. Then, since the lens 120A has mirror symmetry in the direction of the first long axis B1 (e.g., fig. 3D), the light shape of fig. 11A also has mirror symmetry; conversely, the light shape of fig. 11B is not symmetrical because the lens 120A has no symmetry in the direction of the second long axis B2 (e.g., fig. 3C). It should be noted that, compared with fig. 11A and 11B, fig. 11C and 11D are more uniform in light shape distribution as compared with fig. 11A and 11B, and it can be seen that the sub-curved surface 133 of the optical housing 130A has the effect of uniformizing the light distribution.

Referring to fig. 10, 12A and 12B again, since the lens 120D and the optical housing 130A used in fig. 12A and 12B have rotational symmetry, a light shape having rotational symmetry can be generated. Similar to the distribution of the light shapes shown in fig. 11C and 11D, the distribution of the light shapes shown in fig. 12B is more uniform than that shown in fig. 12A, so that the sub-curved surface 133 of the optical housing 130A has the function of homogenizing the light distribution.

Next, the light distribution (light energy distribution, i.e. isolux plot) that can be produced according to the combination of the lens and the optical housing in the above-described embodiments is briefly described. The light distribution of the embodiment in which the lens generates the first rotationally symmetric or rotationally asymmetric light pattern and the optical housing generates the second rotationally symmetric light pattern will be described first, and the light distribution of the embodiment in which the optical housing generates the first rotationally symmetric or rotationally asymmetric light pattern and the lens generates the second rotationally symmetric light pattern will be described next.

Fig. 13A is an isolux plot of the light distribution produced by the light source of fig. 10 after passing through the lens of fig. 3A. FIG. 13B is an isophote graph of the light distribution of FIG. 13A after the light distribution passes through the optical housing of FIG. 7A. Fig. 14A is an isophote plot of the light distribution produced by the light source of fig. 10 after passing through the lens of fig. 6A. FIG. 14B is an isophote graph of the light distribution of FIG. 14A after the light distribution passes through the optical housing of FIG. 7A. FIG. 15A is an isolux plot of the light distribution produced by the light source of FIG. 10 after passing through the lens of FIG. 4A and through the optical housing of FIG. 7A. FIG. 15B is an isolux plot of the light distribution produced by the light source of FIG. 10 after passing through the lens of FIG. 5A and then through the optical housing of FIG. 7A.

First, the light distribution of the embodiment in which the lens generates a first light shape that is rotationally symmetric or non-rotationally symmetric and the optical housing generates a second light shape that is rotationally symmetric will be described. In the drawing of the isolux line, the unit of the horizontal axis and the vertical axis is the height of the light distribution module of the present invention, for example, 10 feet, and the number marked beside the isolux line is the illuminance in the unit of fc (Lm/ft)²I.e., lumens per square foot). The broken line is a half-maximum-intensity line.

Referring to fig. 13A and 13B, in addition to the asymmetric property, the light distribution in fig. 13A and 13B is also biased upward on the vertical axis, so that, if the device for road illumination is used, the device can be configured to bias the lower part of the vertical axis in fig. 13A and 13B toward the sidewalk side (or the house side), and bias the upper part of the vertical axis in fig. 13A and 13B toward the lane side, that is, both the lane and the sidewalk are illuminated at the same time, and the light distribution range on the lane side is smaller, and the light distribution range on the sidewalk side is larger.

Next, referring to fig. 14A and 14B, since the lens 120D of fig. 6A and the optical housing 130A of fig. 7A have rotational symmetry, the light distribution of fig. 14A and 14B also have rotational symmetry.

Further, referring to fig. 15A and fig. 15B, if fig. 15A is compared with fig. 15B, the light distribution of fig. 15B is more uniform, and thus it is more suitable for general large-scale illumination; the light distribution of fig. 15A is narrow and concentrated, and thus is suitable for illumination of narrow roads/roadways. For example, projecting light in a direction perpendicular to the road can reduce the amount of light energy projected to a house on both sides of the road.

Next, the light distribution of the embodiment in which the optical housing generates a first light shape that is rotationally symmetric or non-rotationally symmetric and the lens generates a second light shape that is rotationally symmetric will be described.

FIG. 16A is an isolux plot of the light distribution produced by the light source of FIG. 10 after passing through the lens of FIG. 6A and through the optical housing of FIG. 8A. FIG. 16B is an isolux plot of the light distribution produced by the light source of FIG. 10 after passing through the lens of FIG. 6A and through the optical housing of FIG. 9A.

Referring to fig. 16A and 16B together, if fig. 16A is compared with fig. 16B, the distribution of the light distribution of fig. 16A on the horizontal axis is narrow with a 4-fold rod height ratio in the 0.1fc range, while the distribution of fig. 16B on the horizontal axis is wide with a 5-fold rod height ratio in the 0.1fc range. Thus, fig. 16B may have a wider pitch in the arrangement of the pitch between the lamp post and the lamp post.

Next, embodiments of different width to height ratios of the optical housing according to the above-described embodiments of the present invention are described.

Fig. 17 is a schematic cross-sectional view of a lighting device according to a second embodiment of the invention. Fig. 18 is a schematic cross-sectional view of a lighting device according to a third embodiment of the present invention. Fig. 19 is a schematic cross-sectional view of a lighting device according to a fourth embodiment of the invention.

Referring to fig. 1B, in the present embodiment, the lighting device 10 further includes a reflective base 140, wherein the light source 110, the lens 120 and the optical cover 130 are disposed on the reflective base 140, the reflective base 140 has a reflective surface 142 that forms a first included angle α with a central axis B of light emitted from the light source 110, and a second included angle β is formed between a maximum intensity direction E of the light emitted from the light source 110 after passing through the lens 120 and the central axis B. For example, the light shape of FIG. 11A has a maximum intensity in the direction of 60 degrees, the light shape of FIG. 11B has a maximum intensity in the direction of-30 degrees, and the light shape of FIG. 12A has a maximum intensity in the direction of 45 degrees. Preferably, the second included angle β is smaller than or equal to the first included angle α, so that the lighting device 10 can illuminate the maximum intensity direction E of the light shape at a desired position on the road according to the actual road condition, but the invention is not limited thereto.

In addition, in the lighting device 10 of the present embodiment, the reflective base 140 has the flange 141, the thickness of the optical cover 130 in the direction parallel to the central axis B of the light emitted from the light source 110 is H, and the distance (i.e., the flange height) from the bottom of the optical cover 130 near the light source 110 to the flange 141 in the direction away from the top of the light source 110 parallel to the central axis B is T. In embodiments of the present invention (e.g., the lighting device 10 of FIG. 18), H ≦ T may allow the optical housing 130 to be completely concealed within the flange 141 of the reflective base 140, thereby reducing the chance of damage from foreign objects. In other embodiments of the present invention (e.g., the lighting device 10 of fig. 1B and the lighting device 10 of fig. 17), H > T, the optical housing 130 can be self-cleaning by flowing, for example, rain or dew.

Further, the optical housing 130 has an outer diameter D in a direction perpendicular to the central axis B. It should be noted that, although the invention is not limited to the size and ratio of the thickness H and the outer diameter D of the optical housing 140, for the best implementation of the invention, when H > T, D/H of the embodiment is preferably in the range of 0.5 to 25. For example, the lighting device 10 of FIG. 1B may have a D/H of 4.24, where the outer diameter D is 212 millimeters and the thickness H is 50 millimeters; the lighting device 10 of fig. 17 may have a D/H of 2.4, where the outer diameter D is 212 millimeters and the thickness H is 88 millimeters; and the lighting device 10 of fig. 18 may have a D/H of 21.2, where the outer diameter D is 212 mm and the thickness H is 10 mm.

Moreover, the second light-emitting surface 132 of the optical housing 130 of the lighting device 10 in the above embodiment can be designed as an integral body, that is, the second light-emitting surface 132 of the optical housing 130 is a smooth curved surface, which can seal the interior of the lighting device 10 to achieve the functions of dust prevention and water prevention, so that the lighting device has better environmental pollution resistance, that is, the maintenance cost is lower. In addition, the optical housing 130 may have a thickness greater than about 1.5 mm for optical power, so that the optical housing 130 in the above embodiment may have a sufficient optical power at a thinner thickness compared to the conventional lighting device that usually needs a thicker thickness for sufficient optical power, and thus the lighting device 10 in the above embodiment may also have a reduced manufacturing cost.

In addition, in the embodiment, the height of the flange may be according to design requirements, the invention is not limited thereto, and the invention may include the flange-free case, i.e. T may be 0. In the above-described embodiment, the first included angle α of the reflection surface 142 of the reflection base 140 in fig. 1B, 17 and 18 is smaller than 90 degrees, but the present invention is not limited thereto, and for example, as shown in fig. 19, the first included angle α of the reflection surface 142 of the reflection base 140 of the light distribution module 1900 may be equal to or larger than 90 degrees.

Based on the above description of the lens 120, the optical housing 130, and the reflective base 140 of the lighting device (e.g., the lighting device 10 of fig. 1B, 17, and 18) according to the embodiment of the invention, the light distribution of the lighting device 10 according to the embodiment of the invention can be divided into four types. Specifically, referring to fig. 1B, 17 and 18, the first type of light distribution is (e.g., the lighting device 10 of fig. 18): in the far-field light intensity distribution of the light emitted from the light source 110 after passing through the optics housing 130, the proportion of light energy in a direction at 90 degrees or more from the optical axis a of the optics housing 130 to the total energy of the light after passing through the optics housing 130 is 0%, and the proportion of light energy in a direction at 80 degrees to 90 degrees from the optical axis a of the light after passing through the optics housing 130 to the total energy is less than 10%.

In another embodiment, the second type of light distribution is: in the far-field light intensity distribution of the light emitted from the light source 110 after passing through the optics housing 130, the proportion of light energy in a direction at 90 degrees or more from the optical axis a of the optics housing 130 to the total energy of the light after passing through the optics housing 130 is less than 2.5%, and the proportion of light energy in a direction at 80 degrees to 90 degrees from the optical axis a of the light after passing through the optics housing 130 to the total energy is less than 10%.

In yet another embodiment, the third type of light distribution is: in the far-field light intensity distribution of the light emitted from the light source 110 after passing through the optics housing 130, the proportion of light energy in a direction at 90 degrees or more from the optical axis a of the optics housing 130 to the total energy of the light after passing through the optics housing 130 is less than 5%, and the proportion of light energy in a direction at 80 degrees to 90 degrees from the optical axis a of the light after passing through the optics housing 130 to the total energy is less than 20%.

Further, a fourth type of light distribution is (e.g., the lighting device 10 of fig. 1B and the lighting device 10 of fig. 17): in the far-field light intensity distribution of the light emitted from the light source 110 after passing through the optics housing 130, the proportion of the light energy in the direction of 90 degrees or more from the optical axis a of the optics housing 130 to the total energy of the light after passing through the optics housing 130 is not limited, and the proportion of the light energy in the direction of 80 degrees to 90 degrees from the optical axis a of the light after passing through the optics housing 130 to the total energy is not limited.

Based on the above, the light distribution module and the lighting device of the embodiment of the invention include the lens and the optical cover, one of the lens and the optical cover generates the first light shape that is rotationally symmetric or non-rotationally symmetric, and the other of the lens and the optical cover generates the second light shape that is rotationally symmetric. Therefore, the light distribution module and the lighting device can generate the required light shape through the combination of the lens and the optical housing, can conform to the setting regulation of the lighting device and can be suitable for various road conditions. In addition, the light distribution module and the lighting device of the embodiment of the invention are combined with the optical outer cover through the lens, and compared with the traditional lighting device, the design number of the optical outer cover can be greatly reduced.

Fig. 20 is a schematic perspective view illustrating an assembly structure of a lighting device according to an embodiment of the invention. Referring to fig. 20, in the present embodiment, the reflective base 240 of the lighting device 10 in fig. 20 can be the reflective base 140 in fig. 1B. Further, the optics housing 230 of the lighting device 10 of fig. 20 may be the optics housing 130 of fig. 1B. That is, the optical housing 230 of the lighting device 10 of fig. 20 may be the optical housing 130A of fig. 7A, the optical housing 130B of fig. 8A, the optical housing 130C of fig. 9A, or an optical housing used according to other requirements, which is not limited in the disclosure.

In addition, in the embodiment, the illumination device 10 can assemble the optical cover 230 on the reflective base 240 by screw locking, mechanical fastening, elastic pressing plate, manual slot or the combination thereof, but the invention is not limited to the above-mentioned method, and the optical cover 230 can also be assembled on the reflective base 240 by other suitable methods, such as magnetic attraction, adhesion, etc.

In summary, the light distribution module and the lighting device of the embodiments of the invention include a lens and an optical cover, one of the lens and the optical cover generates a first light shape that is rotationally symmetric or non-rotationally symmetric, and the other of the lens and the optical cover generates a second light shape that is rotationally symmetric. Therefore, the light distribution module and the lighting device can generate the required light shape through the combination of the lens and the optical housing, can conform to the setting regulation of the lighting device and can be suitable for various road conditions. In addition, the light distribution module and the lighting device of the embodiment of the invention are combined with the optical outer cover through the lens, and compared with the traditional lighting device, the design number of the optical outer cover can be greatly reduced.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A light distribution module for controlling light distribution of a light source, the light distribution module comprising:

a lens having a first light incident surface, a first light emitting surface opposite to the first light incident surface, and a receiving groove located at one side of the first light incident surface, wherein the receiving groove is used for receiving the light source, the lens has a first long axis in a direction perpendicular to a central axis of light emitted by the light source, the receiving groove has a second long axis in a direction perpendicular to the central axis of the light emitted by the light source, the direction of the first long axis is different from the direction of the second long axis, and the lens generates a first light shape that is not rotationally symmetric; and

the optical outer cover covers the lens and is provided with a second light inlet surface and a second light outlet surface which are opposite, wherein the second light inlet surface is positioned between the first light outlet surface and the second light outlet surface, the second light inlet surface is provided with a plurality of sub-curved surfaces, the junctions of the adjacent sub-curved surfaces present a turning appearance relative to the sub-curved surfaces, and the junctions of the adjacent sub-curved surfaces present a convex ridge shape in the direction of surrounding the optical axis of the optical outer cover;

wherein the optics housing produces a second light shape that is rotationally symmetric,

the plurality of sub-curved surfaces are annularly arranged in a multi-layer manner around the optical axis of the optical housing, and the plurality of sub-curved surfaces which are annularly arranged in any layer are rotationally arranged around the optical axis of the optical housing.

2. A light distribution module for controlling light distribution of a light source, the light distribution module comprising:

a lens having a first light incident surface, a first light emitting surface opposite to the first light incident surface, and an accommodating groove located at one side of the first light incident surface, wherein the accommodating groove is used for accommodating the light source, the lens has a longitudinal direction and a lateral width direction, the first light emitting surface has a cross-shaped protrusion, an extending direction of an orthographic projection of the cross-shaped protrusion on a reference plane perpendicular to an optical axis of the lens is inclined with respect to the longitudinal direction and the lateral width direction, the first light incident surface has a cross-shaped recess, and an extending direction of an orthographic projection of the cross-shaped recess on the reference plane is inclined with respect to the longitudinal direction and the lateral width direction; and

one of the lens and the optical housing generates a first optical shape which is rotationally symmetric or non-rotationally symmetric, and the other of the lens and the optical housing generates a second optical shape which is rotationally symmetric.

3. A light distribution module for controlling light distribution of a light source, the light distribution module comprising:

a lens having a first light incident surface, a first light emitting surface opposite to the first light incident surface, and an accommodating groove located on one side of the first light incident surface, wherein the accommodating groove is used for accommodating the light source, the lens has a longitudinal direction and a transverse width direction, the first light emitting surface has a cross-shaped protrusion, an extending direction of an orthographic projection of the cross-shaped protrusion on a reference plane perpendicular to an optical axis of the lens is the same as the longitudinal direction and the transverse width direction, the first light incident surface has a cross-shaped recess, and an extending direction of an orthographic projection of the cross-shaped recess on the reference plane is the same as the longitudinal direction and the transverse width direction; and

4. A light distribution module for controlling light distribution of a light source, the light distribution module comprising:

the lens comprises a first light incident surface, a first light emitting surface opposite to the first light incident surface and a containing groove positioned on one side of the first light incident surface, wherein the containing groove is used for containing the light source, the first light incident surface and the first light emitting surface of the lens are in axial symmetry, and the side surface of the first light incident surface is steeper as the side surface of the first light incident surface is closer to the top point of the first light emitting surface; and

wherein the optics housing produces a first light shape that is rotationally symmetric or non-rotationally symmetric and the lens produces a second light shape that is rotationally symmetric,

5. The light distribution module according to any one of claims 1 to 4, wherein the second light exit surface is axisymmetric.

6. A light distribution module as recited in claim 1, wherein the first long axis is perpendicular to the second long axis.

7. A light distribution module according to claim 1, wherein the first light emitting surface is not mirror-symmetric in a direction perpendicular to the first long axis, and the receiving recess is not mirror-symmetric in a direction of the second long axis.

8. A light distribution module as recited in claim 2, wherein the lens produces the first light shape that is rotationally symmetric.

9. A light distribution module as recited in claim 3, wherein the lens produces the first light shape that is rotationally symmetric.

10. The light distribution module of any one of claims 2 to 4, wherein the optical housing has a longitudinal direction and a transverse direction, the optical housing is mirror symmetric in the longitudinal direction and non-mirror symmetric in the transverse direction, and the optical housing generates the first light shape that is non-rotationally symmetric.

11. A light distribution module as recited in claim 10, wherein the sub-curved surfaces are arranged in a multi-layer ring shape that is mirror symmetric in the lengthwise direction and non-mirror symmetric in the widthwise direction.

12. A light distribution module as recited in claim 11, wherein the plurality of annularly arranged layers proximate a center of the optical housing are cardioid-shaped.

13. The light distribution module of any one of claims 1 to 4, further comprising a reflective base, wherein the light source, the lens and the optical housing are disposed on the reflective base.

14. A light distribution module according to claim 13, wherein the reflection base has a reflection surface that forms a first included angle with a central axis of the light emitted from the light source, a second included angle is formed between a maximum intensity direction of the light emitted from the light source after passing through the lens and the central axis, and the second included angle is smaller than or equal to the first included angle.

15. A light distribution module according to claim 13, wherein the reflective base has a flange, the thickness of the optical cover in a direction parallel to a central axis of light emitted from the light source is H, a distance from a bottom of the optical cover near the light source to the flange in a direction parallel to the central axis away from a top of the light source is T, and H ≦ T.

16. A light distribution module according to claim 13, wherein the reflection base has a flange, the optical cover has a thickness H in a direction parallel to a central axis of light emitted from the light source, a distance T from a bottom of the optical cover near the light source to the flange in a direction parallel to the central axis away from a top of the light source, and H > T.

17. The light distribution module according to any one of claims 1 to 4, wherein a thickness of the optical cover in a direction parallel to a central axis of light emitted from the light source is H, an outer diameter of the optical cover in a direction perpendicular to the central axis is D, and D/H falls within a range of 0.5 to 25.

18. The light distribution module according to any one of claims 1 to 4, wherein the intersections of adjacent sub-curved surfaces in a direction from an edge of the optical housing to a center of the optical housing have a level difference.