WO2019227636A1

WO2019227636A1 - Direct-lit panel lamp

Info

Publication number: WO2019227636A1
Application number: PCT/CN2018/096579
Authority: WO
Inventors: 徐向阳
Original assignee: 江苏日月照明电器有限公司
Priority date: 2018-05-30
Filing date: 2018-07-23
Publication date: 2019-12-05
Also published as: CN208804522U

Abstract

A direct-lit panel lamp, comprising an LED lamp bead (1), a lens (2), a light source circuit board (3), and a diffuser plate (4). The lens (2) is fixed right above the LED lamp bead (1), and both the lens (2) and the LED lamp bead (1) are fixed on the light source circuit board (3); the diffuser plate (4) is provided above the lens (2); a concave surface with an opening (5) facing upwards is formed on the top at the center part of the lens (2), and an inner cavity (6) with an opening facing downwards is formed at the bottom; the LED lamp bead (1) is provided right under the inner cavity (6); the included angle of a beam angle in maximum light intensity with an optical axis is 70-80 degrees; the light intensity in the direction of the light axis is not greater than 3% of the maximum light intensity. The direct-lit panel lamp is reasonable in structural design, high in lighting effect, small in thickness, and uniform in light emitting, and achieves an ultrathin design of direct-lit panel lamps, with a thickness of the lamp body being lower than 4 centimeters; the problem about the uniformity of a light emitting surface is solved, and the uniformity reaches 80% or more; the lighting effect is improved, and achieves 100 lm/W.

Description

Direct-down panel light

Technical field

The utility model belongs to the field of lighting technology, and particularly relates to a direct type panel light.

Background technique

Direct-type flat panel light is a kind of surface-emitting light, which is widely used in offices, shopping malls, residences, squares, airports and other occasions. Its light-emitting principle is to fix the LED light source to the emitted light through the lens (or not through the lens) After being irradiated on the diffuser plate, after multiple light changes such as reflection and diffuse reflection of the diffuser plate, the light is finally transmitted out of the diffuser plate and emitted out of the diffuser plate, thereby generating an illumination function and illuminating the surrounding environment. In order to solve the problem that the light emitting surface is uniform, the thickness of the flat lamp is made large, and the lamp beads are kept away from the diffuser plate, resulting in low light efficiency. There are also direct-type flat-panel lights, although the thickness is small, but because the lamp beads are close to the diffuser plate, there are obvious bright spots on the light-emitting surface, the uniformity is poor, and the light efficiency is low.

Utility model content

The purpose of the utility model is to solve the defects and deficiencies existing in the prior art, and provide a direct-type panel lamp with reasonable structural design, high light efficiency, small thickness, and uniform light emission.

In order to achieve the above object, the technical solution adopted by the present utility model is: a direct type panel light, which includes LED lamp beads, a lens, a light source circuit board, and a diffusion plate, the lens is fixed directly above the LED lamp beads, and the lens And LED lamp beads are fixed on the light source circuit board, the diffuser plate is arranged above the lens, a concave surface with an upward opening at the top of the center of the lens, and an inner cavity with an opening downward at the bottom, the lens surface is For free-form surfaces, the angle between the maximum light intensity beam angle and the optical axis is 70-80 degrees, and the light intensity value in the direction of the optical axis is not greater than 3% of the maximum light intensity. The LED lamp beads are disposed directly below the inner cavity.

Preferably, a plurality of the LED lamp beads are provided, which are evenly spaced on the LED light bar, and the LED lamp bars are provided, which are evenly spaced on the light source circuit board.

Preferably, the light source circuit board is fixed on the bottom case, and the diffusion plate is fixed above the lens through a face frame and the distance between the light source circuit board and the LED light bar is set to 20-40 mm.

Preferably, the distance between the adjacent LED lamp beads is 50-100mm.

Preferably, the lens has a diameter of 14.5-22 mm and a height of 4.5-7 mm.

Preferably, the inner cavity has a diameter of 3-5.5mm and a height of 3.5-5.5mm.

Preferably, the depth of the concave surface is 0.8-1.0 mm.

Preferably, seven LED light bars are provided, and six LED light beads are provided on each of the LED light bars.

Preferably, the inner surface of the bottom case is coated with a light-reflecting layer having a reflectance greater than 85%.

Preferably, a pillar is provided at the bottom of the lens for convenient positioning and installation.

After adopting the above technical solution, the utility model has the following beneficial effects:

The direct-type panel light provided by the utility model realizes the ultra-thinness of the direct-type panel light. The thickness of the lamp body is less than 4 cm; the problem of uniform light emitting surface is solved, and the uniformity is more than 80%; and the light efficiency is improved. , The light effect reaches 100 lumens / watt.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of the overall structure of a direct type panel light of the present utility model;

2 is a structural sectional view of a lens of the present invention;

3 is another perspective view of the cross-sectional view of FIG. 2 of the present invention;

4 is a sectional view showing another structure of the lens of the present invention;

5 is a top view of a direct type panel light of the present invention;

Fig. 6 is a sectional view of the A-A plane in Fig. 4 of the present invention.

Among them: LED lamp beads 1, lens 2, light source circuit board 3, diffuser plate 4, concave surface 5, inner cavity 6, LED light bar 7, bottom case 8, surface frame 9.

Detailed ways

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

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood in a broad sense unless otherwise specified and defined, for example, they may be fixed connections or removable Connected or integrated; it can be mechanical or electrical; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

As a light source, the light intensity distribution curve of the LED lamp bead body is a Lambertian distribution, and the light intensity of the center of the plane perpendicular to the plane of the LED lamp bead is the strongest. , It is relatively weak away from the center, showing a circular light spot distribution. Due to the ultra-thin direct-type flat-panel lamp, its LED lamp beads are very close to the diffuser plate. In order to achieve a uniform light intensity distribution on a closer plane, a secondary optical design is required. First, a mathematical model of the LED lens is established and calculated. The normal vector of each point on the lens surface, so as to get the outline of each point, and then constitute the surface of the lens.

As shown in FIG. 1-6, a direct-type panel light provided by the present invention includes LED lamp beads 1, a lens 2, a light source circuit board 3, and a diffusion plate 4. The lens 2 is fixed to the LED lamp beads 1. Directly above the lens 2 and the LED lamp beads 1 are fixed on the light source circuit board 3, the diffuser plate 4 is disposed above the lens 2, a concave surface 5 with an opening upward is provided at the top of the center 2 of the lens, and a bottom is provided with There is an inner cavity 6 with an opening downward. The LED lamp beads 1 are disposed directly below the inner cavity 6. As the lens 2 of the secondary optics, the structural shape is similar to that of the upper part of the apple, and the center of the outer surface is concave inward. The angle between the maximum light intensity beam angle and the optical axis is 70-80 degrees, and the light intensity value in the direction of the optical axis is not greater than 3% of the maximum light intensity.

Wherein, the LED lamp beads 1 and the lens 2 are fixed on the LED light bar 7, the lens 2 is positioned and supported on the LED light bar 7, and the light source circuit board 3 is fixed on the bottom case 8. The diffusion plate 4 is fixed above the lens 2 through the surface frame 9 and the distance from the LED light bar 7 is set to 20-40 mm. The inner surface of the bottom case 8 is coated with a reflective layer, and the reflectance of the reflective layer is greater than 85. %, No additional reflective layer is needed to avoid the increase of the thickness of the panel light. The LED lamp beads 1 are provided in multiples and are evenly distributed on the LED light bar 7. The LED light bars 7 are provided in multiple and evenly spaced. Distributed on the light source circuit board 3, specifically, 7 LED light bars 7 are provided, and each of the LED light bars 7 is provided with 6 LED lamp beads 1, and the LED lamp beads 1 are adjacent to each other. The distance is 50-100mm, the diameter of the lens 2 is 14.5-22mm, the height is 4.5-7mm, the diameter of the inner cavity 6 is 3-5.5mm, the height of the inner cavity 6 is 3.5-5.5mm, and the depth of the concave surface 5 is 0.8mm-1.0mm.

When the direct-type panel light of the utility model is used, the height of the lens 2 is 5.1mm, the diameter of the inner cavity 6 is 3.35mm, the diameter of the lens 2 is 15.5mm, the distance between the LED light bar 7 and the diffusion plate 4 is 3cm, and the LED light bar 7 is parallel There are 7 sets, and 6 LED lamp beads 1 are provided on each LED light bar 7. The distance between adjacent LED lamp beads 1 on each LED light bar 7 is 9 cm. The distance between the LED lamp beads 1 is 7.5cm, and the light intensity distribution curve of the LED lamp beads 1 under the secondary optical action of the lens 2, the beam angle of the maximum light intensity is 76 degrees, and the light intensity value in the direction of the optical axis is 1% of maximum light intensity.

After testing, the direct-type panel light provided by the present utility model has a light emission uniformity of more than 80% and a light efficiency of 100 lumens / watt.

By adopting a direct type panel light provided by the utility model, the thickness of the lamp body is less than 4 cm, which realizes the ultra-thinness of the direct type panel light and solves the problem of uniform light emitting surface. Therefore, the utility model has a wide market The prospect is worth promoting and using.

The above are only the preferred embodiments of the present invention, but the scope of protection of the present invention is not limited to this. Any person skilled in the technical field is within the technical scope disclosed by the present invention. Equivalent replacements or changes of the new technical solution and the concept of the utility model shall be covered by the protection scope of the utility model.

Claims

A direct type panel light includes LED lamp beads (1), lenses (2), light source circuit boards (3), and diffuser plates (4), characterized in that the lens (2) is fixed to the LED lamp beads (1) ), And the lens (2) and the LED lamp beads (1) are fixed on the light source circuit board (3), the diffusion plate (4) is arranged above the lens (2), and the ( 2) The top surface is provided with a concave surface (5) with an upward opening, and the bottom surface is provided with an internal cavity (6) with a downward opening. The surface of the lens (2) is a free curved surface, and the angle between the maximum light intensity beam angle and the optical axis is 70-80 degrees, the light intensity value in the direction of the optical axis is not greater than 3% of the maximum light intensity, and the LED lamp beads (1) are disposed directly below the inner cavity (6).
The direct type panel light according to claim 1, characterized in that: the LED lamp beads (1) are provided in plurality, and are evenly distributed on the LED light bar (7), and the LED light bar (7) ) Is provided with a plurality of ones, which are evenly distributed on the light source circuit board (3).
The direct type panel light according to claim 2, characterized in that the light source circuit board (3) is fixed on the bottom case (8), and the diffuser plate (4) is fixed on the surface frame (9) by The distance above the lens (2) and the LED light bar (7) is set to 20-40 mm.
The direct type panel light according to claim 2, characterized in that the distance between the adjacent LED lamp beads (1) is 50-100mm.
The direct-type panel light according to claim 4, wherein the lens (2) has a diameter of 14.5-22 mm and a height of 4.5-7 mm.
The direct type panel light according to claim 5, wherein the inner cavity (6) has a diameter of 3-5.5mm and a height of 3.5-5.5mm.
The direct type panel light according to claim 6, characterized in that the depth of the concave surface (5) is 0.8-1.0 mm.
The direct-type panel lamp according to claim 2, characterized in that: the inner surface of the bottom case (8) is coated with a light-reflecting layer having a reflectance greater than 85%.