WO2016041430A1 - Led spot lamp - Google Patents

Abstract

An LED spot lamp, comprising an LED light source (30), a condensing lens (10) and a reflection cup (20) arranged outside the condensing lens. The condensing lens comprises an inner surface (11) close to the LED light source, an outer surface (12) far away from the LED light source and an optical axis (13) located at the center of the condensing lens. The inner surface comprises an annular surface (111) around the optical axis and a top surface (112) with the center being penetrated by the optical axis. Light incident upon the annular surface is refracted towards the reflection cup, and light incident upon the top surface is refracted towards the optical axis. Light transmitted from the annular surface is refracted by the outer surface and then is emergent to the reflection cup, and the reflection cup reflects first emergent light (A) that is parallel to the optical axis. Light transmitted from the top surface is refracted by the outer surface and then is emergent to form second emergent light (B) that is close to and parallel to the optical axis. By means of the spot lamp, the LED spot light that has high central light strength, low glare rating and uniform light color can be obtained with the cooperation of reflection and transmission.

Description

LED spotlight Technical field

The invention relates to a lighting device, in particular to an LED spotlight.

technical background

LEDs have been popularized for lighting fixtures. The color quality of LEDs is required to be higher and higher in specific illuminations, and the light color distribution requirements of the object surface are getting higher and higher to meet the humanized needs of the face. However, the LED is 180° light, which has the characteristics of severe glare and uneven transition of the spot effect. In the commercial lighting field such as shops, art galleries, conference rooms, etc., a narrow angle beam is needed, which requires the design of the optical system of the LED with the focused beam.

At present, the common concentrated beam technology adopts a secondary total reflection lens, and the lens is an array of a plurality of small lenses integrated, and each lenslet separately aligns a single LED to achieve the purpose of focusing light. However, this technique has the disadvantage that the intermediate obstacles leave a ghost image on the illuminated surface; another technique uses a reflective cup, which directly focuses the COB (on-chip package) LED to achieve the purpose of light distribution. This technique has the drawback that the light color cannot be completely mixed uniformly, resulting in a yellow circle.

Therefore, there is a need for a new type of LED spotlight, which has better concentrating effect on the LED light source, has the effect of reducing ghosting and glare, and has a high light intensity and uniform spot.

Summary of invention

In order to overcome the above technical drawbacks, it is an object of the present invention to provide an LED spotlight.

The invention discloses an LED spotlight, comprising: an LED light source, a collecting lens and a reflecting cup disposed outside the collecting lens, the collecting lens comprising an inner surface close to the LED light source and away from the LED light source An outer surface and an optical axis at a center of the concentrating lens; the inner surface including a toroid surrounding the optical axis and a top surface through which the optical axis passes; the light incident to the torus The reflecting cup direction is refracted, and light incident on the top surface is refracted toward the optical axis; light transmitted from the annular surface is refracted through the outer surface and then emitted to the reflective cup, and the reflective cup is Reflected parallel to a first outgoing light of the optical axis; and light transmitted from the top surface is refracted by the outer surface and exits to form a second outgoing light that is adjacent to and parallel to the optical axis.

Preferably, the outer surface is semi-circular or semi-circular with an axis of symmetry of the optical axis.

Preferably, the top surface is a convex surface that is convex toward the LED light source.

Preferably, the portion of the outer surface on which the second outgoing light is emitted is in a convex direction away from the convex surface of the LED light source.

Preferably, the convex surface is made by matte sanding.

Preferably, the ratio of the width of the LED light source to the width of the cavity formed by the collecting lens facing the inner surface of the LED light source is between 50% and 75%.

Preferably, the angle of light refracted from the top surface is 0-20° with respect to the optical axis; the angle of light refracted from the torus is 20-70° from the optical axis.

Preferably, the annulus is a cylindrical surface.

Preferably, the top surface and the toroid are connected to a junction point; when the distance between the junction point and the LED light source increases, an angle between the light refracted by the top surface and the optical axis Increasing, an angle between the light refracted by the torus and the optical axis is decreased; when the distance between the boundary point and the LED light source is decreased, the light refracted by the top surface and the optical axis The angle of the light is reduced, and the angle between the light refracted by the torus and the optical axis is increased.

Preferably, the angle of the light projected to the reflector cup after being refracted by the outer surface is 50-80° from the optical axis.

Preferably, the LED light source is plural, and each of the LED light sources is provided with one of the collecting lenses; and the plurality of collecting lenses form a collecting lens group.

After adopting the above technical solution, compared with the prior art, the following beneficial effects are obtained:

1. The light center obtained after the aggregation has high light intensity, low glare value and uniform spot;

2. The size of the reflector cup is greatly reduced, reducing the space occupied.

DRAWINGS

1 is a schematic view showing the structure and light-emitting of an LED spotlight according to a preferred embodiment of the present invention.

Figure 2a is a first perspective view of the collecting lens of the present invention;

Figure 2b is a second perspective view of the concentrating lens of the present invention.

Reference mark:

10-concentrating lens, 11-inner surface, 111-ring surface, 112-top surface, 12-outer surface, 121-convex surface, 13-optical axis, 14-fixed surface;

20-reflecting cup;

30‐LED light source.

Summary of the invention

Advantages of the present invention are further explained below in conjunction with the accompanying drawings and specific embodiments.

1 is a schematic structural view of an LED spotlight according to an embodiment of the present invention. The LED spotlight includes an LED light source 30 disposed inside, a condenser lens 10 disposed outside the LED light source 30 for collecting light emitted from the LED light source 30, and a light collecting lens 10 disposed outside the collecting lens 10 for transmitting the light from the collecting lens 10. The reflective cup 20 is reflected by light.

1, 2a and 2b, the concentrating lens 10 includes an inner surface 11 adjacent to the LED light source 30, an outer surface 12 away from the LED light source 30, and an optical axis 13 at the center of the concentrating lens 10. The light is first incident from the inner surface 11 into the collecting lens 10 and then emitted from the outer surface 12. The concentrating lens 10 is disposed in an accommodating space formed by the reflecting cup 20 by a mounting base (not shown), and the reflecting cup 20 is also supported on the mounting base. In order to make the light-collecting lens 10 and the reflector cup 20 transmit and reflect light with a high intensity of the center of the light, and there is no overlapping shadow, the transmitted and reflected light should be emitted independently of each other. Therefore, the concentrating lens 10 is configured as follows: the inner surface 11 includes a toroidal surface 111 and a top surface 112, the annular surface 111 is disposed around the optical axis 13 so as to surround the LED light source 30, and the optical axis 13 passes through the top surface 112, ie The top surface 112 faces the LED light source 30 with a slight offset from the LED light source 30 or with the optical axis 13. Due to different positional settings of different transmissive surfaces and the principle of refraction of light, the light incident on the toroidal surface 111 and the top surface 112 is deflected in a different direction after the first refraction. The light incident on the toroidal surface 111 on the side is refracted toward the reflection cup 20, and the light incident on the top surface 112 of the end surface is refracted toward the optical axis 13. Then, after the first refraction, the optical paths of the light split to the toroidal surface 111 and the top surface 112 have been separated. When the light from the LED light source 30 is emitted from the outer surface 12, the outer surface 12 is twice refracted, and the light transmitted from the annular surface 111 is refracted by the outer surface 12 and then emitted to the reflective cup 20, and transmitted from the top surface 112. The light is refracted through the outer surface 12 and is emitted from the light exit opening of the reflector cup 20. After the secondary refraction, the optical paths of the light split to the toroidal surface 111 and the top surface 112 are further separated, and the light transmitted by the annulus 111 is incident at an angle to the optical axis 13 to the reflective cup 20, and passes through the reflective cup 20 The first outgoing light A, which is reflected and collimated to exit the parallel optical axis 13, the light transmitted by the top surface 112 forms a second outgoing light B near the optical axis 13 and parallel to the optical axis 13 after secondary refraction. Wherein, the first outgoing light is concentrated on a portion of the reflective cup 20 near the outer edge to form external concentrated light; and the second outgoing light is concentrated on a portion close to the optical axis 13 to form a central concentrated light having a higher light intensity. Through the structural arrangement of the inner surface 11 and the outer surface 12 of the concentrating lens 10, and the use of the reflective cup 20, the light from the LED light source 30 is separated into two beams, and each light is collected to achieve a concentrated distribution. Light. At the same time, due to the effect of the secondary refraction, the light transmitted from the annulus 111 is more deflected toward the reflecting cup 20, so that the reflection incident on the reflecting cup 20 is closer to the bottom of the reflecting cup 20. Generally, when the incident light is incident on the reflective cup 20, since the incident angle with the reflective cup 20 is large, the reflection point is also relatively located outside the reflective cup 20, and when the reflection point is near the bottom, The size of the reflector cup 20 can be reduced a lot.

In an embodiment, after the outer surface 12 is refracted, the angle of deflection of the refracted light is 10-40°, and the angle between the light projected onto the reflective cup 20 and the optical axis 13 is 50-80°, and accordingly, The angle between the light and the normal direction of the surface of the reflector cup 20 (i.e., the angle of incidence) is reduced. As the angle of incidence decreases and the point of reflection is closer to the outer surface 12, the size of the reflector cup 20 can be reduced.

For the arrangement of the outer surface 12, it is shaped as a semicircular or semi-circular shape with the optical axis 13 as the axis of symmetry to enhance the refraction effect of the secondary refraction. The larger the secondary refraction effect, the closer the reflection point incident to the reflective cup 20 is to the bottom of the reflective cup 20, and the size of the reflective cup 20 can be designed to be smaller.

In the above embodiment, the outer surface 12 may also be formed by symmetrical rotation of any free curved surface to perform secondary refraction of the emitted light, but the shape of the curved surface should ensure that the light reflected from the reflective cup 20 and the light emitted from the outer surface 12 are parallel to The first outgoing light A and the second outgoing light B of the optical axis 13.

When it is desired to narrow the width of the center outgoing light, that is, closer to the optical axis 13 after two refractions, the top surface 112 may be configured as a convex surface that is convex toward the LED light source 30. The surface convex surface is used to enhance the refraction effect of the light incident on the LED light source 30 of the top surface 112, so that the center outgoing light is closer to the optical axis 13, and the center outgoing light is narrower, which can be applied to occasions requiring emphasis illumination.

Further or alternatively, in the above embodiment, the central portion of the outer surface 12 or the top thereof, that is, the portion from which the second outgoing light B is emitted, is away from the convex surface 121 of the LED light source 30 in a convex direction. Also utilizing the raised transmission surface, the refractive effect of the second exiting light B as it passes over the outer surface 12 is enhanced to bring it closer to the optical axis 13.

In the combination or single configuration of the above embodiment, the central region of the concentrating lens 10 is a biconvex or plano-convex structure, and different embodiments such as the top surface 112 and the top surface 12 of the outer surface 12 are selected or selected as needed for the central region. It is a raised structure.

In a preferred embodiment, during the manufacturing process of the convex-transparent surface 121, a matte finish is applied to prevent the convex condensing lens 10 from producing a convex lens, so that the second outgoing light B is scattered light, and the scattered light is filled. A portion between the outgoing light A and the second outgoing light B, such that the first outgoing light A and the second outgoing light B combine to form an integral beam, and the possibility of glare is eliminated.

Due to the requirement for uniform color of the emitted light, the toroidal surface 111 can be set as a cylindrical surface, and the light emitted from the annular surface 111 can be uniformly emitted without uneven distribution of light intensity.

In another embodiment, the ratio of the width of the LED light source 30 to the width of the cavity formed by the condenser lens 10 facing the inner surface 11 of the LED light source 30 is between 50% and 70%, so that the LED light source 30 is covered. In the cavity of the concentrating lens 10, the heat of the LED light source 30 is not closely adhered to the condensing lens 10, and the space occupied by the condensing lens 10 is also reduced, thereby improving the light-emitting effect.

For embodiments of the present invention, the width of the central narrow beam and the peripheral wide beam are adjustable. Specifically, since the boundary between the incident top surface 112 and the annular surface 111 is at the connection surface between the center of the LED light source 30 and the boundary line between the top surface 112 and the annular surface 111, the area of the top surface 112 can be enlarged or reduced. The angle between the optical axis 13 and the above-mentioned interface is enlarged or reduced, and the larger the angle is, the wider the transmitted light is, and vice versa. In a preferred embodiment, the angle between the light transmitted by the top surface 112 and the optical axis 13 is between 0-20°, and a small angle of light emitted from the LED light source 30 is incident on the top surface 112, and the torus The angle between the transmitted light of the 111 and the optical axis 13 is between 20 and 70°, and the large-angle light emitted from the LED light source 30 is incident on the reflective cup 20 and collimated by the reflector to finally produce a narrow beam of uniform light color distribution. Light distribution.

Another adjustment may be to adjust the height of the annulus 111. The top surface 112 and the annular surface 111 are connected to a junction point, and the cross section of the collecting lens formed by the top surface 112 and the annular surface 111 can be regarded as a substantially rectangular shape. When the width of the annular surface 111 is fixed, that is, When the bottom of the rectangle is constant, the distance between the junction point and the LED light source 30 (ie, the height of the top surface 112 or the height of the rectangle) increases or decreases, and the diagonal of the rectangle (ie, the separation into the top surface 112) The angle between the boundary line of the toroid 111 and the top surface 112 also increases or decreases. When the angle between the diagonal of the rectangle and the top surface 112 increases, the angle between the light refracted by the top surface 112 and the optical axis 13 increases, and the angle between the light refracted by the annular surface 111 and the optical axis 13 decreases. When the angle between the diagonal of the rectangle and the top surface 112 is decreased, the angle between the light refracted by the top surface 112 and the optical axis 13 is decreased, and the angle between the optical fiber refracted by the annular surface 111 and the optical axis 13 is increased. Therefore, in the above embodiment, the arrangement of 20° as the boundary angle separating the first outgoing light A and the second outgoing light B is variable, and can be freely selected between 0 and 90° depending on the actual situation.

Since a plurality of LED light sources 30 are generally provided in the existing LED spotlights, a collecting lens 10 in the above embodiment is provided for each of the LED light sources 30, and the plurality of collecting lenses 10 form a collecting lens group. The concentrating lens group can be integrally formed and matched on the corresponding LED light source 30.

It should be noted that the embodiments of the present invention are preferred embodiments, and are not intended to limit the scope of the present invention. Any one skilled in the art may use the above-disclosed technical contents to change or modify the equivalent embodiments. , but without departing from the technical solution of the present invention, according to the present The technical and technical changes to the above embodiments are still within the scope of the technical solutions of the present invention.

Claims (11)

An LED spotlight comprising: an LED light source, a collecting lens and a reflecting cup disposed outside the collecting lens, the collecting lens comprising an inner surface adjacent to the LED light source, an outer surface away from the LED light source, and An optical axis located at a center of the condensing lens, characterized in that The inner surface includes a torus surrounding the optical axis and a top surface through which the optical axis passes; Light incident on the toroid is refracted toward the reflecting cup, and light incident on the top surface is refracted toward the optical axis; Light transmitted from the torus is refracted through the outer surface and exits to the reflective cup, and the first emergent light parallel to the optical axis is reflected by the reflective cup; Light transmitted from the top surface is refracted through the outer surface and exits to form a second outgoing light that is adjacent to and parallel to the optical axis. The LED spotlight of claim 1 wherein: The outer surface has a semicircular or semi-circular shape with the optical axis as the axis of symmetry. The LED spotlight according to claim 1 or 2, characterized in that The top surface is a convex surface that is convex toward the LED light source. The LED spotlight of claim 3, wherein The portion of the outer surface on which the second outgoing light is emitted is in a convex direction away from the convex surface of the LED light source. The LED spotlight according to claim 4, wherein The convex surface is made by matte sanding. The LED spotlight of claim 1 wherein: The ratio of the width of the LED light source to the width of the cavity formed by the collecting lens facing the inner surface of the LED light source is between 50% and 75%. The LED spotlight of claim 1 wherein: The angle of the light refracted from the top surface and the optical axis is 0-20°; The angle of light refracted from the torus is 20-70° from the optical axis. The LED spotlight of claim 1 wherein: The torus is a cylindrical surface. The LED spotlight of claim 1 wherein: The top surface and the toroid are connected to a junction point; When an angle between the junction point and the LED light source increases, an angle between a light refracted by the top surface and the optical axis increases, and a light refracted by the torus is sandwiched by the optical axis Angle reduction When the distance between the junction point and the LED light source is decreased, an angle between the light refracted by the top surface and the optical axis is decreased, and an angle between the light refracted by the toroid and the optical axis Increase. The LED spotlight of claim 9 wherein: The angle of the light that is refracted by the outer surface and projected onto the reflector cup is 50-80° from the optical axis. The LED spotlight of claim 1 wherein: The LED light source is plural, and each of the LED light sources is provided with one of the collecting lenses; A plurality of the condensing lenses form a concentrating lens group.

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