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

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

A LED panel lamp lens and LED light source

technical field

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

Background technique

Under the current situation of energy shortage, LED, as the fourth-generation lighting source, has gradually gained a place in the lighting industry due to its advantages of small size, low power consumption, high brightness and fast response speed, and has become the preferred light source for energy saving and environmental protection. Freeform surface lighting is a new lighting method with high design freedom, which can flexibly adjust the beam distribution, simplify the structure of the lighting system, and realize complex lighting. Therefore, more and more lighting systems use free-form optical devices as light distribution components of LEDs.

The existing flat panel lamp lenses are mostly free-form surface lenses with large-angle circular light spots. The light emitted by the LED light source passes through the inner and outer free-form surfaces to present circular light spots. By arranging the LED lenses and lamp beads in a certain order, the circular light spots are superimposed on each other. Make the entire light-emitting surface of the panel light uniform. This arrangement makes the edges and corners darker. In order to solve the problem that the edges and four corners of the flat panel lamp are relatively dark, a rectangular light spot is used for light distribution in the prior art, and the internal free-form surface is set as a frosted surface to make the light spot uniform.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, and to provide an LED panel lamp lens, which can solve the problem of dark edges and four corners of the panel lamp.

For achieving the above object, the technical scheme adopted in the present invention is as follows:

The LED panel lamp lens is characterized in that: the bottom surface of the lens is a polished plane; the plane where the bottom surface of the lens is defined is the xy plane;

The center of the bottom surface of the lens is provided with a space for accommodating the LED light-emitting chip, the top surface of the space is the light incident surface, the light incident surface is a frosted free-form surface, and the light incident surface is on the two longitudinal sections of xz and yz. The contour lines are all parabolic, the light incident surface is formed by rotating the parabola around the z-axis, and the contour on the cross-section parallel to the xy plane is circular;

The light-emitting surface of the lens is a polished free-form surface. The contour lines of the light-emitting surface of the lens on the cross-section parallel to the xy plane are all rectangles with rounded corners. The light-emitting surface of the lens is tangent, continuous and convex. The contour lines of the light-emitting surface on the two longitudinal sections xz and yz are both half ellipses symmetrical with respect to the longitudinal sections.

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

Further, the LED panel light lens is made of PMMA material.

Further, the bottom surface of the lens coincides with the long axis of the semi-elliptical contour line of the light exit surface on the yz longitudinal section.

Further, the bottom surface of the lens does not overlap with the long axis of the semi-elliptical contour line of the light exit surface on the xz longitudinal section.

Further, the lengths of the major axes of the semi-elliptical contour lines on the two longitudinal sections xz and yz of the light emitting surface of the lens are different.

An LED light source, characterized in that the light-emitting surface of the LED light-emitting chip is flat and the light-emitting surface is rectangular, and the LED light-emitting chip is located in the cavity formed by the frosted curved surface of the LED panel lamp lens and the bottom surface of the lens .

Further, in the LED light source, the long side of the LED light-emitting chip corresponds to the relatively long side of the bottom surface of the lens, and the short side of the LED light-emitting chip corresponds to the short side of the bottom surface of the lens.

Beneficial effects of the present invention:

The present invention is an LED flat light lens. Compared with the prior art, in the LED flat light lens, the light incident surface of the free curved surface is set as a frosted surface, so that the light emitted by the LED chip is scattered through the light incident surface of the lens, so that the light incident surface of the lens is scattered. The light spot on the receiving surface is more uniform, and the macular phenomenon at the edge of the lens caused by the large light-emitting angle is eliminated. The outline of the bottom surface is a rectangle with rounded corners. The light-emitting surface of the LED panel light lens is a free-form surface obtained by lofting the outline of the xz and yz sections and the outline of the bottom surface. The light emitted by the LED chip passes through the lens. The light refracted in the xz section forms the short side of the rectangular spot on the receiving surface, and the light emitted by the LED chip passes through the lens yz section is refracted and radiated to form the long side of the rectangular spot on the receiving surface. The light spot generated by the LED chip through the lens is slightly rectangular as a whole, and the LED light-emitting chips are arranged in a rectangular array according to the appropriate spacing, so that the adjacent single rectangular light spots on the receiving surface are superimposed to make the entire light-emitting surface of the flat panel lamp uniform. Therefore, the problem that the edges and four corners of the light-emitting surface of the original circular large-angle flat-panel lamp lens are dark can be eliminated.

Description of drawings

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

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

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

Figure 4 is a top view of the lens of the present invention.

FIG. 5 is a schematic three-dimensional structure diagram of the lens of the present invention.

FIG. 6 is a light spot illuminance diagram of a single lens of the lens according to the present invention.

FIG. 7 is the actual simulation effect applied to the panel lamp after the panel lamp lenses of the present invention are arranged in an appropriate order.

In the picture:

1- bottom surface, 2- light-incident surface, 3- light-emitting surface.

Detailed ways

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

Referring to Figure 1, Figure 2, Figure 3, Figure 4 and Figure 5, the LED panel lamp lens of the present invention, the LED panel lamp lens, is characterized in that: the bottom surface of the lens is a polished plane; the plane where the bottom surface of the lens is defined is xy flat. The center of the bottom surface of the lens is provided with a space for accommodating the LED light-emitting chip, the top surface of the space is the light incident surface, the light incident surface is a frosted free-form surface, and the light incident surface is on the two longitudinal sections of xz and yz. The contour lines are all parabolic, the light incident surface is formed by rotating the parabola around the z-axis, and the contour on the cross-section parallel to the xy plane is circular. The light-emitting surface of the lens is a polished free-form surface, the contour lines of the light-emitting surface of the lens on the cross-section parallel to the xy plane are all rectangles with rounded corners, and the light-emitting surface of the lens is tangent, continuous and convex. The contour lines of the light emitting surface of the lens on the two longitudinal sections xz and yz are both half ellipses symmetrical with respect to the longitudinal section.

The bottom surface 1 of the lens coincides with the long axis of the semi-elliptical contour line of the light-emitting surface 3 on the yz longitudinal section. The bottom surface 1 of the lens and the long axis of the semi-elliptical contour line of the light exit surface 3 on the xz longitudinal section do not overlap. The lengths of the major axes of the semi-elliptical contour lines on the two longitudinal sections xz and yz of the light-emitting surface 3 of the lens are different.

The material used for the lens of the panel lamp is PMMA, which adopts the injection molding process, and the light transmittance is as high as 90%.

5 and 6, the light incident surface of the LED panel lamp lens of the present invention is set as a frosted surface, so that the light spot generated by the LED chip passing through the lens is more uniform, and the macular phenomenon at the edge of the lens caused by the large light-emitting angle is eliminated.

The invention also provides an LED light source, the length of the LED light-emitting chip is 3.5mm, the width is 2.8mm, and the height is 0.7mm, and the LED light-emitting chip is located in the cavity formed by the light incident surface of the LED panel lamp lens and the bottom surface of the lens In the body, the bottom end of the LED light-emitting chip is aligned with the flat polished surface of the lens. The long side of the LED light-emitting chip corresponds to the relatively long side of the bottom surface of the lens, and the short side of the LED light-emitting chip corresponds to the short side of the bottom surface of the lens. The light emitted by the LED light-emitting chip reaches the receiving surface through the frosted light-incident surface and the light-emitting surface, and the light emitted by the LED light-emitting chip through this section corresponds to the short side of the rectangular light spot. Referring to FIG. 7 , the LED panel light lens and the provided LED light source are arranged in a certain order, and the light spots of the single lenses are superimposed on each other to present a uniform effect as a whole.

Compared with the existing circular large-angle lens, the present invention can eliminate the problem that the edges and four corners of the light-emitting surface are dark in the simulation of the original circular large-angle flat lamp lens, the overall effect of the receiving surface is more uniform, and the volume is more uniform. Small, simple structure and low cost.

The above description of the disclosed embodiments enables those skilled in the art to which the present invention pertains to make changes and modifications to the above-described embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the invention.

Claims (5)

1. 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. 2. The L ED flat lamp lens of claim 1, wherein the lens is injection molded.
3. 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. 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. 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.

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