CN107664279B

CN107664279B - L ED flat lamp lens and L ED light source

Info

Publication number: CN107664279B
Application number: CN201710815111.1A
Authority: CN
Inventors: 吕柳; 孟梦; 林盼福; 邵人杰
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2017-09-12
Filing date: 2017-09-12
Publication date: 2020-07-31
Anticipated expiration: 2037-09-12
Also published as: CN107664279A

Abstract

The invention discloses a L ED flat lamp lens and a L ED light source, wherein the bottom surface of the L ED flat lamp lens is a polished plane, the center position of the bottom surface of the lens is provided with a space for accommodating a L ED light-emitting chip, the top surface of the space is a light-in surface, the light-in surface is a frosted free-form surface, the light-out surface of the lens is a polished free-form surface, the contour lines of the light-out surface of the lens on two longitudinal sections are semi-ellipses which are symmetrical relative to the longitudinal sections, and the light-out surface of the lens is tangent, continuous and convex.

Description

L ED flat lamp lens and L ED light source

Technical Field

The invention relates to the technical field of L ED lighting lamps, in particular to a L ED flat lamp lens and a L ED light source.

Background

Under the situation of energy shortage at present, L ED as a fourth generation illumination light source gradually occupies a place in the illumination industry with the advantages of small volume, low power consumption, high brightness, high response speed and the like, and becomes a preferred energy-saving and environment-friendly light source.

The conventional flat lamp lens is mostly a free-form surface lens with large-angle circular light spots, emitted light from an L ED light source presents circular light spots through an inner free-form surface and an outer free-form surface, the L ED lens and lamp beads are arranged in a certain sequence, the circular light spots are mutually overlapped, and therefore the whole light emitting surface of the flat lamp is uniform.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an L ED flat lamp lens, wherein the L ED flat lamp lens can solve the problem that the edges and four corners of a flat lamp are dark.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

l ED flat lamp lens, which is characterized in that the bottom surface of the lens is a polished plane, the plane where the bottom surface of the lens is located is defined as xy plane;

the central position of the bottom surface of the lens is provided with a space for containing L ED light-emitting chips, the top surface of the space is a light-in surface, the light-in surface is a frosted free-form surface, the contour lines of the light-in surface on two longitudinal sections of xz and yz are both parabolic, the light-in surface is formed by rotating the parabola around the z axis, and the contour line of the light-in surface on the cross section parallel to the xy plane is circular;

the lens goes out the free curved surface of plain noodles for the polishing, the contour line that the lens goes out the plain noodles on the cross section that is on a parallel with xy face is the rectangle that has the radius angle, tangent continuation and protrusion are gone out to the lens, the contour line that the lens goes out the plain noodles on two longitudinal sections of xz, yz is all for half an ellipse that the longitudinal section is symmetrical.

Further, the lens is formed by an injection molding process.

Further, the L ED flat lamp lens is made of PMMA material.

Further, the bottom surface of the lens is coincident with the long axis of the semielliptic contour line of the light-emitting surface on the yz longitudinal section.

Furthermore, the bottom surface of the lens and the long axis of the semielliptic contour line of the light-emitting surface on the xz longitudinal section are not overlapped.

Furthermore, the lengths of the long axes of the semi-elliptical contour lines of the light emitting surface of the lens on the xz longitudinal section and the yz longitudinal section are different.

The L ED light source is characterized in that the light-emitting surface of the L ED light-emitting chip is a plane and the light-emitting surface is rectangular, and the L ED light-emitting chip is located in a cavity formed by a frosted curved surface of the L ED flat lamp lens and the bottom surface of the lens.

Further, in the L ED light source, the L ED light emitting chip long side corresponds to the side with relatively long lens bottom surface, and the L ED light emitting chip short side corresponds to the side with short lens bottom surface.

The invention has the beneficial effects that:

compared with the prior art, the L ED flat lamp lens has the advantages that the inner free-form surface light incoming surface is set to be a frosted surface, so that light emitted by the L ED chip is scattered through the lens light incoming surface, light spots on a receiving surface are more uniform, and meanwhile, the phenomenon of yellow spots on the edge of the lens due to large light emitting angles is eliminated.

Drawings

FIG. 1 is a front view of a lens according to the present invention.

Fig. 2 is a left side view of the lens of the present invention.

Fig. 3 is a bottom view of the lens of the present invention.

Fig. 4 is a top view of a lens according to the invention.

Fig. 5 is a schematic perspective view of the lens of the present invention.

FIG. 6 is a graph of the spot illumination of a single lens of the present invention.

Fig. 7 is a diagram showing the actual simulation effect applied to the flat panel lamp after the lenses of the flat panel lamp according to the present invention are arranged in a proper order.

In the figure:

1-bottom surface, 2-light incident surface and 3-light emergent surface.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, 2, 3, 4 and 5, the L ED flat lamp lens and the L ED flat lamp lens are characterized in that the bottom surface of the lens is a polished plane, a plane where the bottom surface of the lens is located is defined as an xy plane, a space for containing a L ED light-emitting chip is arranged in the center of the bottom surface of the lens, the top surface of the space is a light incident surface, the light incident surface is a frosted free curved surface, contour lines of the light incident surface on xz and yz longitudinal sections are both parabolic, the light incident surface is formed by rotating the parabola around a z axis, the contour line of the light incident surface on a cross section parallel to the xy plane is circular, the light emergent surface of the lens is a polished free curved surface, contour lines of the light emergent surface of the lens on a cross section parallel to the xy plane are both rectangles with rounded corners, the light emergent surface of the lens are tangent, continuous and convex, and contour lines of the light emergent surface of the lens on the xz and yz longitudinal.

The bottom surface 1 of the lens is superposed with the long axis of the semielliptic contour line of the light-emitting surface 3 on the yz longitudinal section. The long axes of the semi-elliptical contour lines of the bottom surface 1 and the light emitting surface 3 of the lens on the xz longitudinal section are not overlapped. The long axis lengths of the semi-elliptical contour lines of the light-emitting surface 3 of the lens on the xz longitudinal section and the yz longitudinal section are different.

The flat lamp lens is made of PMMA, and the light transmittance is up to 90% by adopting an injection molding process.

Referring to fig. 5 and 6, the L ED flat lamp lens light incident surface is a frosted surface, so that light spots generated by the L ED chip passing through the lens are more uniform, and the phenomenon of macula lutea generated at the edge of the lens due to a large light emitting angle is eliminated.

The invention also provides an L ED light source, wherein the L ED light emitting chips are 3.5mm in length, 2.8mm in width and 0.7mm in height, the L0 ED light emitting chips are positioned in a cavity formed by the light incident surface and the bottom surface of the L ED flat lamp lens, the bottommost ends of the L ED light emitting chips are aligned with the plane polishing surface of the lens, the long side of the L ED light emitting chips corresponds to the relatively long side of the bottom surface of the lens, the short side of the L ED light emitting chips corresponds to the short side of the bottom surface of the lens, light emitted by the L ED light emitting chips reaches a receiving surface through the frosted light incident surface and light emergent surface, and light emitted by the L ED light emitting chips through the section corresponds to the short side of a rectangular light spot, referring to the short sides of the FIG. 7, the L ED flat lamp lens and the provided L ED light source are arranged according to a certain sequence.

Compared with the existing round large-angle lens, the round large-angle flat lamp lens disclosed by the invention can solve the problem that the edge and four corners of the light-emitting surface are darker when the original round large-angle flat lamp lens is used for simulation, and the receiving surface has the advantages of more uniform overall effect, small volume, simple structure and low cost.

The above description of the disclosed embodiments is intended to enable those skilled in the art to make modifications and alterations to the described embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

The L ED flat lamp lens is characterized in that the bottom surface (1) of the lens is a polished plane, and the plane where the bottom surface (1) of the lens is located is defined as an xy plane;

the central position of the bottom surface (1) of the lens is provided with a space for containing L ED light-emitting chips, the top surface of the space is a light-in surface (2), the light-in surface (2) is a frosted free-form surface, the contour lines of the light-in surface (2) on xz and yz longitudinal sections are parabolic shapes, the light-in surface (2) is formed by rotating the parabola around a z axis, and the contour line on the cross section parallel to an xy plane is circular;

the lens light-emitting surface (3) is a polished free-form surface, the contour lines of the lens light-emitting surface (3) on the cross section parallel to the xy plane are all rectangles with rounded corners, the lens light-emitting surface (3) is tangent, continuous and convex, and the contour lines of the lens light-emitting surface (3) on xz and yz longitudinal sections are all half ellipses which are symmetrical relative to the longitudinal sections;

the bottom surface (1) of the lens is superposed with the long axis of the semielliptic contour line of the light-emitting surface (3) on the yz longitudinal section;

the long axes of the semiellipse contour lines of the bottom surface (1) and the light-emitting surface (3) on the xz longitudinal section are not overlapped;

the long axis lengths of the semiellipse contour lines of the light-emitting surface (3) of the lens on xz and yz longitudinal sections are different.
2. The L ED flat lamp lens of claim 1, wherein the lens is injection molded.
3. L ED flat lamp lens according to claim 1 or 2, characterized in that, the L ED flat lamp lens is made of PMMA material.
4. An L ED light source, characterized in that the light emitting surface of the L ED light emitting chip is plane and the light emitting surface is rectangular, the L ED light emitting chip is located in the cavity formed by the frosted curved surface of the L ED flat lamp lens and the bottom surface (1) of the lens according to any one of claims 1-2.
5. The L ED light source of claim 4, wherein the L ED light emitting chips have a longer side corresponding to the side of the lens bottom surface (1) that is relatively long, and the L ED light emitting chips have a shorter side corresponding to the side of the lens bottom surface (1) that is relatively short.