CN118881993A - Optical assembly, lamp and lighting system - Google Patents

Abstract

The invention provides an optical assembly of a lamp, which comprises a light source, a collimation module, a light interception module and a convergence module which are sequentially arranged along an optical axis, wherein: the light source comprises an LED chip, the center of the LED chip is arranged on the optical axis, and the light emitting direction is opposite to the light incident surface of the collimation module; the collimation module comprises a single lens or a collimation lens group and is used for refracting and collimating and emitting the light beam emitted from the light source; the light interception module comprises a plurality of light interception pieces which are arranged in the light emergent direction of the collimating lens module around the optical axis, and the light interception pieces encircle a light interception port to cut light beams; the converging module is arranged on the other side of the light-intercepting sheet along the optical axis and comprises a converging lens with a convex light-entering surface, and the converging lens is used for collecting light beams passing through the light-intercepting opening, converging and then emitting the light beams to the irradiation surface. In the optical component, the uniformity of the irradiation light spots is improved through the lens of the convergence module, so that the focus illumination of a specific range is realized.

Description

Optical assembly, lamp and lighting system

Technical Field

The invention relates to the field of lamp illumination, in particular to an optical assembly, and a lamp and an illumination system containing the optical assembly.

Background

At present, the key illumination of art painting, ornaments and the like in the market is realized by a spotlight or a special projection lamp, but the two lamps have some defects in use, so that the illumination effect is not ideal. The spot lamp is installed at the top ceiling and irradiates obliquely downwards, when the spot lamp irradiates, the spot can be in a hilly shape, the upper part of the spot is small, the lower part of the spot is large, the problem of uneven brightness exists on the irradiation surface, the brightness is poor far from the spot lamp, and the light overflows an irradiation area. For projection lamps, the application range is limited due to the large lamp body, high cost and low brightness.

Accordingly, those skilled in the art have been working to develop an optical assembly and a lamp and lighting system including the same, improving the effect of illumination.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention aims to solve the problems of uneven brightness and light overflow of the illumination area on the illumination surface of the conventional lamp.

In order to achieve the above object, the present invention provides an optical assembly of a lamp, including a light source, a collimation module, a light interception module, and a convergence module sequentially disposed along an optical axis, wherein: the light source comprises an LED chip, the center of the LED chip is arranged on the optical axis, and the light emitting direction is opposite to the light incident surface of the collimation module; the collimation module comprises a single lens or a collimation lens group and is used for refracting and collimating and emitting the light beam emitted from the light source; the light interception module comprises a plurality of light interception pieces which are arranged in the light emitting direction of the collimation module around the optical axis, and the light interception pieces encircle a light interception port to cut light beams; the converging module is arranged on the other side of the light-intercepting sheet along the optical axis and comprises a converging lens with a convex light-entering surface, and the converging lens is used for collecting light beams passing through the light-intercepting opening, converging and then emitting the light beams to the irradiation surface; the first plane is defined as a plane containing an optical axis, the light incident surface of the converging lens comprises a first sub-surface and a second sub-surface, the first sub-surface and the second sub-surface are cut by the first plane to form a first contour line and a second contour line which are connected with each other smoothly at the middle connection part, wherein the first contour line is provided with a first end far away from the optical axis, the first contour line is intersected with the optical axis, the curvature radius of the first contour line gradually increases from the first end to the middle connection part, the second contour line is provided with a second end far away from the optical axis, the curvature radius of the second contour line gradually increases from the middle connection part to the second end, and the curvature radius of the second contour line close to the middle connection part is smaller than the curvature radius of the first contour line close to the middle connection part.

Further, the second contour line is located at one side of the optical axis, and the outgoing beam of the beam incident from the second contour line after being refracted by the converging lens intersects with the optical axis so that the outgoing beam reaches the irradiation surface at the other side of the optical axis.

Further, a second plane is defined which perpendicularly intersects the first plane, and the cross-sectional profile of the converging lens in the second plane is axisymmetric along the optical axis.

Preferably, the light exit surface of the converging lens is a flat transparent surface.

Preferably, the single lens is one of a plano-convex lens, a biconvex lens or a TIR lens.

Preferably, each lens in the collimator lens group is a positive lens, and is axisymmetric in each section including the optical axis.

Further, each lens in the collimating lens group is a plano-convex lens, the light incident surface of each plano-convex lens is a plane transparent surface perpendicular to the optical axis, the second lens and the first lens are arranged in the collimating lens group in sequence closest to the light interception port, in any section passing through the optical axis, an included angle alpha is formed between any light ray emitted from the light source and the direction of the optical axis when the light ray is emitted after being refracted by the first lens, an included angle beta is formed between the normal direction of the light emergent point of the light emergent surface of the light ray after being refracted by the second lens and the direction of the optical axis, and the included angle beta and the included angle alpha meet the following association formula:

Where n is the refractive index of the second lens.

Still further, the plurality of light-blocking sheets are configured to be operatively movable and coplanar along a same plane perpendicular to the optical axis.

Further, the illumination surface is a vertical plane, and the first plane is a vertical plane perpendicular to the illumination surface.

The invention also provides a lamp comprising an optical assembly as described above.

The invention also provides an illumination system, which comprises the lamp, wherein the lamp is arranged on the top, the optical axis obliquely irradiates an irradiation object placed along the irradiation surface, the first contour line of the converging lens is closer to the irradiation surface than the second contour line, when the illumination system is used, the direction of the lamp is regulated to enable the optical axis to face the irradiation object, light rays incident from the first surface of the converging lens are refracted and then emitted to the middle-lower side area of the irradiation object, light rays incident from the second surface are refracted and then emitted to the upper side area of the irradiation object, and the shape of an interception opening is changed after the interception sheet is operated and moved, so that the irradiation area and the irradiation object are matched.

According to the optical assembly, the lamp and the lighting system, firstly, the light emitted by the LED light source is collimated through the collimation module, a preliminary light spot is formed after passing through the light interception port, and then the uniformity of the irradiated light spot is improved through the lens of the convergence module, so that the focus lighting of an irradiated object with a specific range is realized.

The conception, specific structure, and technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present invention.

Drawings

Fig. 1 is a schematic structural view of an embodiment of the optical assembly of the present invention.

Fig. 2 is a schematic view of an optical path of a collimation module in an optical assembly according to the present invention.

Fig. 3 is a schematic cross-sectional view of an optical assembly of the present invention along a first plane.

FIG. 4 is a schematic cross-sectional view of an optical assembly of the present invention along a second plane

Fig. 5 is a schematic structural view of an embodiment of the illumination system of the present invention.

Wherein: 100 light sources, 200 collimation modules, 300 light interception modules, 400 convergence modules, 500 optical axes, 600 irradiation surfaces, 1LED chip, 2 first lenses, 21 first light incident surfaces, 22 first light emergent surfaces, 3 second lenses, 31 second light incident surfaces, 32 second light emergent surfaces, 4 light interception sheets, 41 light interception ports, 5 convergence lenses, 51 first sub-surfaces, 52 second sub-surfaces, 53 intermediate joints, 54 first contour lines, 55 second contour lines, a P1 first plane and a P2 second plane.

Detailed Description

Fig. 1 shows an optical assembly of a lamp according to the present invention, which includes a light source 100, a collimation module 200, a light interception module 300, and a convergence module 400 sequentially disposed along an optical axis 500. The light source 100 comprises an LED chip 1, the center of which is arranged on the optical axis 500, and the light emitting direction is opposite to the light incident surface of the collimation module 200; the collimation module 200 comprises a single lens or a collimation lens group, and is used for refracting and collimating and emitting the light beam emitted from the light source 100; the light interception module 300 includes a plurality of light interception pieces 4, which are disposed around the optical axis 500 in the light emitting direction of the collimating lens group 200, and the plurality of light interception pieces 4 enclose a light interception port 41 to intercept the light beam; the converging module 400 is disposed on the other side of the light-intercepting sheet 4 along the optical axis 500, and includes a converging lens 5 with a light incident surface being a convex transmission surface, and is configured to collect and converge the light beams passing through the light-intercepting opening 41, and then emit the light beams to the irradiation surface 600.

In one embodiment of the present invention, the collimating module 200 is composed of a single lens, which may be selected from one of a plano-convex lens, a biconvex lens, or a TIR lens. The implementation of TIR (Total Internal Reflection) lenses can be to collimate light with small angle through a refraction surface and collimate light with large angle through a reflection surface, so as to obtain quasi-parallel light; the single lens adopts a plano-convex lens or a biconvex lens, and the emergent light can be collimated after being refracted through the two refraction surfaces of the single lens by arranging the light source 100 at the focus of the single lens.

As shown in fig. 2, in another embodiment of the present invention, the collimating module 200 is composed of a collimating lens group. Each lens in the collimating lens group is a positive lens and is optionally axisymmetric in each section including the optical axis 500. Alternatively, the size of each lens in the collimating lens group sequentially increases along the light-emitting direction, and the latter lens receives as much light as possible emitted from the former lens.

Further, as a preferred embodiment of the present invention, each lens in the collimator lens group is a plano-convex lens, the light incident surface of each plano-convex lens is a plane surface perpendicular to the optical axis 500, and the light exit surface is a convex surface. Taking the collimating lens group as an example, the collimating lens group is composed of two plano-convex lens groups of a first lens 2 and a second lens 3, wherein the first lens 2 is close to the light source 100, the second lens 3 is close to the light interception port 41, the first lens 2 comprises a first light incident surface 21 and a first light emergent surface 22, the second lens 3 comprises a second light incident surface 31 and a second light emergent surface 32, and the two lenses take the optical axis 500 as a rotational symmetry center. In the schematic light path shown in fig. 2, a light L1 emitted from the LED chip 1 at an angle θ irradiates the point a on the first lens 2, the light L2 is refracted and emitted from the point B on the first light-emitting surface 22 after being refracted by the first light-incident surface 21, the light L3 continues to irradiate the point C on the second light-incident surface 31 of the second lens 3, and the refracted light L4 is refracted and emitted in parallel as a light L5 after being refracted from the point D on the second light-emitting surface 32 of the second lens 3.

The horizontal direction is the direction of the optical axis 500, θ ₁ is the refraction angle of the light beam on the first light incident surface 21 of the first lens 2, that is, the angle between the light beam L2 refracted on the first light incident surface 21 along the light path of the light beam and the direction of the optical axis 500, θ ₂ is the incident angle of the light beam L2 in the first lens 2 on the first light emitting surface 22, θ ₃ is the refraction angle on the first light emitting surface 22, and θ ₄ is the angle between the outgoing light beam L3 after the light beam passes through the first lens 2 and the direction of the optical axis 500.

According to the principle of refraction of light rays and the geometrical relationship, there are the following angular relationships in the first lens 2:

sinθ＝n sinθ₁，

n sinθ₂＝sinθ₃，

θ₁+θ₂＝θ₃+θ₄，

further generalizations can be made from the above relation:

The refractive indices of the first lens 2 and the second lens 3 may be the same or different, and in this embodiment, the refractive indices of the first lens 2 and the second lens 3 are each set to n, and are not distinguished.

The included angle between the normal direction of the point B on the first light-emitting surface 22 and the direction of the optical axis 500 is equal to the included angle θ ₅ between the tangential direction and the vertical direction of the point:

θ₅＝θ₃+θ₄，

According to the above relation, the magnitude of the included angle is related to θ and θ ₄, so that the direction of the incident light and the direction of the emergent light of the same light on the first lens 2 and the tangential direction of the emergent point on the emergent surface of the first lens 2 are in one-to-one correspondence, and the slope angle of each point on the first lens 2 on the cross section can be obtained by knowing θ and θ ₄, and the contour curve of the first lens 2 can be obtained.

Similarly, for the second lens 3, since the outgoing light of the second lens 3 is parallel to the optical axis 500, according to the incident angle θ ₄ of the incident light L3 of the second lens 3, the refraction angle θ ₆ at the point C of the second light incident surface 31, the incident angle θ ₇ and the outgoing angle θ ₈ of the light L4 in the second lens 3 at the point D of the second light emergent surface 32 are as follows:

sinθ₄＝n sinθ₆，

θ₆+θ₇＝θ₈，

n sinθ₇＝sinθ₈，

From the above relation, it is possible to obtain:

An included angle θ ₈ between the normal direction of the D point of the light beam exiting from the second light-exiting surface 32 and the direction of the optical axis 500 is equal to an included angle θ ₉ between the tangential direction and the vertical direction of the point. Since the direction of the outgoing light passing through the second lens 3 is parallel to the optical axis 500, according to the incident angle of the incoming light on the second light incident surface 31, the shape of the second light emergent surface 32 adapted to collimate and emit each light can be designed according to the tangential direction corresponding to each point on the second light emergent surface 32.

To sum up, regarding the collimating lens group, the second lens 3 and the first lens 2 are set in order closest to the light interception port 41 in the collimating lens group, and no matter the collimating lens group is composed of only the first lens 2 and the second lens 3, or the number of lenses of the collimating lens group is larger than two, in the section passing through the optical axis 500, an included angle α is formed between any light ray emitted from the light source 100 when the light ray is refracted by the first lens 2 and emitted in the direction of the optical axis 500, and an included angle β is formed between the normal direction of the light emitting surface of the light ray and the direction of the optical axis 500 by the second lens 3, and the included angle β corresponds to the included angle α one by one and satisfies the following formula:

Therefore, each lens of the collimating lens group can design the shape outline of the emergent surface of each lens according to the use requirement of the light change before incidence and after emergent so as to realize the collimation and emergent of the light source.

The light interception pieces 4 are arranged to be operatively movable, a plurality of light interception pieces 4 are enclosed into a light interception port 41 with a specific shape according to the requirements, since the light interception pieces 4 tend to have a certain thickness, if each light interception piece 4 moves in different movement planes respectively, the thickness of the light interception port 41 is necessarily increased, and the problems of virtual focus, edge blurring and the like are easy to occur for the use occasion that the light beam with a smaller size finally forms a light spot amplified by several times, therefore, the plurality of light interception pieces 4 are preferably arranged in a coplanar manner along the same plane perpendicular to the optical axis 500.

The converging module 400 receives the light beam passing through the light interception port 41, and at least comprises a converging lens 5 for re-distributing the light beam to finally exit on the irradiation surface 600. As shown in fig. 1 and 3, the converging module 400 is a converging lens 5, and defines a first plane P1 as a plane including an optical axis 500, especially for a vertical illumination plane 600, the first plane P1 is a vertical plane, a contour of an incident surface of the converging lens 5 cut by the first plane P1 is an arc, and the converging module includes a first facet 51 and a second facet 52 with different contour changes, where the first facet 51 and the second facet 52 are a first contour line 54 and a second contour line 55 in a cross section of the first plane P1, respectively, and are connected to the intermediate connection 53 in a smooth manner. The first contour line 54 has a first end distant from the optical axis 500, the first contour line 54 intersects the optical axis 500 and the radius of curvature gradually increases from the first end toward the intermediate junction 53; the second contour line 55 and the optical axis 500 do not intersect, having a second end distant from the optical axis 500, the radius of curvature of the second contour line 55 gradually increases from the intermediate connection 53 to the second end, and the radius of curvature of the contour line of the second contour line 55 near the intermediate connection 53 is smaller than the radius of curvature of the contour line of the first contour line 54 near the intermediate connection 53.

Fig. 3 shows a schematic optical path diagram of each light ray in a section formed by the first plane P1 when the collimated outgoing light beam is incident on the light incident surface of the converging lens 5 from the light interception port 41. The collimated light beam, after being refracted by the first contour line 54 and entering the converging lens 5, basically exhibits the effect of converging and refracting the light beam downwards towards the optical axis 500; the curvature radius of the first contour line 54 gradually increases, the curvature radius of a section of arc line near the first end is small, and the deflection of the refracted light ray is larger; the curvature radius of an arc line of the first contour line 54 near the middle joint 53 is large, the included angle between the tangent line of each point on the first contour line 54 and the optical axis 500 is gradually increased, the deflection of the refracted light is small, and most of the refracted light is emergent near the optical axis 500. The second contour line 55 is located closest to the light-blocking sheet 4 on the contour line at the intermediate connection 53, and the second contour line 55 extends from the intermediate connection 53 away from the optical axis 500 and curves toward the irradiation surface 600. Since the radius of curvature of the second contour line 55 near the intermediate junction 53 is relatively small, the angle of deflection of the refracted light beam changes significantly when the light beam transitions from being incident on the first contour line 54 to being incident on the second contour line 55, and the outgoing light beam refracted by the converging lens 5 from the light beam incident on the second contour line 55 intersects the optical axis 500 to reach the illumination surface 600 on the other side of the optical axis 500.

In an alternative, the intermediate junction 53 is the position on the light entrance surface of the converging lens 5 closest to the light interception port 41. The light beams refracted by the converging lens 5 are distributed on both sides of the optical axis 500 by the different curved profiles provided by the first facet 51 and the second facet 52, respectively.

A second plane P2 is defined which perpendicularly intersects the first plane P1 at the optical axis 500. Fig. 4 is a schematic cross-sectional structure of the optical component of the present invention at the second plane P2. In this cross section, the cross section profiles of the collimating lens group and the converging lens 5 are axisymmetric along the optical axis 500, i.e. the first plane P1 is a symmetry plane of the optical assembly, and the outgoing light rays refracted by the converging lens 5 converge on a focal point on the optical axis 500 and then diverge outwards.

Further, the light exit surface of the converging lens 5 is a flat transparent surface, and may be further perpendicular to the optical axis 500. The rear side of the converging lens 5 along the light emitting direction may be provided with other optical elements to adjust the light deflection direction according to actual needs.

Preferably, the illumination plane 600 is arranged as a vertical plane, and the first plane P1 is arranged perpendicular to the illumination plane 600, so that the optical axis 500 is also perpendicular to the illumination plane 600, and thus the second plane P2 is a substantially horizontal plane, and in the second plane P2, the outgoing light beam can be uniformly distributed on the illumination plane 600, so that the illumination plane 600 has uniform illumination intensity along the horizontal direction.

Accordingly, the present invention further provides a lamp, which includes a housing, a power supply, etc., wherein the optical component is installed in the housing, and the conventional structure of the lamp is known to those skilled in the art through the prior art, so that the description thereof is omitted herein.

The present invention also provides an illumination system, as shown in fig. 5, in which a lamp is mounted on the top, the optical axis 500 irradiates an irradiation object placed along the irradiation surface 600 obliquely downward, for example, drawing, in a vertical first plane P1 cross section, the first contour line 54 of the converging lens 5 is closer to the irradiation surface 600 than the second contour line 55, when in use, the direction of the lamp is adjusted to make the optical axis 500 face the irradiation object, the collimation module 200 refracts and collimates a light beam emitted from the light source 100 and emits the light beam through the light interception port 41, the light incident from the first contour line 54 of the converging lens 5 is refracted and emits the light beam to a middle lower side region of the irradiation object, the light incident from the second contour line 55 is refracted and emits the light beam to an upper side region of the irradiation object, and the position of the light interception piece 4 is adjusted to change the shape of the light interception port 41, so that the irradiation region and the irradiation object are adapted.

In the preferred embodiment, in the illumination system, the first plane P1 where the optical axis 500 is located is perpendicular to the illumination plane 600, and each lens of the collimation module 200 and the converging lens 5 are centered on the optical axis 500 in the second plane P2, so that light in the horizontal direction is uniformly distributed to the illumination object, the area of the second facet 52 is smaller than that of the first facet 51, the emergent light refracted by the first facet 51 and the second facet 52 of the converging lens 5 forms a light spot, the light deflection angle is large, the edge light intensity of the light spot is weaker, the optical axis 500 of the adjustable lamp faces and the position of the light-intercepting piece 4, the illumination object is mainly illuminated, and the edge of the illumination object is gradually darkened, so as to provide a better viewing experience.

The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.

Claims (11)

1. An optical component of a lamp is characterized in that,

Including light source (100), collimation module (200), interception module (300), the collection module (400) that set gradually along optical axis (500), wherein:

The light source (100) comprises an LED chip (1), the center of the LED chip is arranged on the optical axis (500), and the light emitting direction is opposite to the light incident surface of the collimation module (200);

the collimation module (200) comprises a single lens or a collimation lens group and is used for refracting and collimating and emitting the light beams emitted from the light source (100);

The light interception module (300) comprises a plurality of light interception pieces (4), the light interception pieces (4) are arranged in the light emergent direction of the collimation module (200) around the optical axis (500), and the light interception pieces (4) enclose a light interception port (41) to cut light beams;

the converging module (400) is arranged on the other side of the light-intercepting sheet (4) along the optical axis (500), and comprises a converging lens (5) with a convex light-entering surface, wherein the converging lens is used for collecting light beams passing through the light-intercepting opening (41), converging and then emitting the light beams to the irradiation surface (600);

Defining the first plane as one plane containing the optical axis (500), the light entrance surface of the converging lens (5) includes a first facet (51) and a second facet (52), a first contour line (54) and a second contour line (55) which are formed to meet smoothly at the intermediate junction (53) respectively, the first contour line (54) having a first end far from the optical axis (500), the first contour line (54) intersecting the optical axis (500) and having a radius of curvature gradually increasing from the first end toward the intermediate junction (53), the second contour line (55) having a second end far from the optical axis (500), the radius of curvature of the second contour line (55) gradually increasing from the intermediate junction (53) toward the second end, and the radius of curvature of the second contour line (55) near the intermediate junction (53) being smaller than the radius of curvature of the first contour line (54) near the intermediate junction (53).

2. An optical assembly according to claim 1, wherein the second contour line (55) is located on one side of the optical axis (500), and an outgoing light beam, which is refracted by the converging lens (5) by the light beam incident from the second contour line (55), intersects the optical axis (500) so that the outgoing light beam reaches the irradiation surface (600) on the other side of the optical axis (500).

3. An optical assembly according to claim 1, characterized in that a second plane is defined which perpendicularly intersects the first plane at the optical axis (500), the cross-sectional profile of the converging lens (5) in the second plane being axisymmetric along the optical axis (500).

4. An optical assembly as claimed in claim 1, characterized in that the light exit surface of the converging lens (5) is a flat transparent surface.

5. The optical assembly of claim 1, wherein the single lens of the collimating module (200) is one of a plano-convex lens, a biconvex lens, or a TIR lens.

6. An optical assembly as claimed in claim 1, characterized in that each lens of the collimator lens group is a positive lens and is axisymmetric in each section comprising the optical axis (500).

7. An optical assembly according to claim 6, wherein each lens in the collimating lens group is a plano-convex lens, the light incident surface of each plano-convex lens is a plane transmitting surface perpendicular to the optical axis (500), the second lens (3) and the first lens (2) are arranged in the collimating lens group closest to the light interception port (41) in sequence, in any section passing through the optical axis (500), an included angle α is formed between any light ray emitted from the light source (100) and the direction of the optical axis (500) when the light ray is refracted by the first lens (2), and an included angle β is formed between the normal direction of the light emergent surface of the light ray and the direction of the optical axis (500) after the light ray is refracted by the second lens (3), and the included angle β and the included angle α satisfy the following association formula:

Wherein n is the refractive index of the second lens (3).

8. An optical assembly according to claim 1, wherein the plurality of light-intercepting sheets (4) are configured to be operatively movable and coplanar along a same plane perpendicular to the optical axis (500).

9. An optical assembly according to claim 1, wherein the illumination plane (600) is a vertical plane, and the first plane is a vertical plane perpendicular to the illumination plane (600).

10. A luminaire comprising an optical assembly as claimed in any one of claims 1 to 9.

11. A lighting system comprising a luminaire as claimed in claim 10, characterized in that the luminaire is mounted on top, the optical axis (500) is directed obliquely downwards towards an irradiation object placed along the irradiation surface (600), the first contour (54) of the converging lens (5) is closer to the irradiation surface (600) than the second contour (55), and in use the luminaire is directed towards the irradiation object by adjusting the direction of the luminaire, light incident from the first facet (51) of the converging lens (5) is refracted and emitted to the middle-lower region of the irradiation object, light incident from the second facet (52) is refracted and emitted to the upper region of the irradiation object, and the shape of the light cut (41) is changed after the movement of the light cut (4) is operated such that the irradiation region and the irradiation object are adapted.