LIGHT-MIXING COVER AND LIGHTING DEVICE

A light-mixing cover includes a base plate and multiple lens groups. The base plate has a lens plane, and the multiple lens groups are arranged on the lens plane in a first direction. Each of the lens groups includes multiple lenses arranged at intervals in a second direction perpendicular to the first direction. At least one of the lenses is different in structure from a lens adjacent thereto.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Chinese Application No. 202320723594.3, filed on Mar. 30, 2023. The disclosure of the above application is incorporated herein by reference in its entirety.

FIELD

The present disclosure relates to optoelectronics technologies, and more particularly, to a light-mixing cover and a lighting device.

BACKGROUND

A lamp board of a lighting device is generally formed by arranging multiple light-emitting diode (LED) small-particle lamp beads in an array, and a surface light source is formed by arranging multiple point light sources that emit light in an array. If light-concentrating or light-mixing is required, a light-concentrating system is required for each LED light source. A plate lens is formed by light-concentrating systems arranged in an array.

In general, multiple lenses forming a plate lens are identical. When the lamp board is formed by lamp beads of same color temperature and color, each lens on the plate lens has a same effect on each lamp bead, and a lighting area of the lighting device has no distinct light area and dark area. When the lamp board is formed by lamp beads of multiple color temperatures or multiple colors, since the lenses on the plate lenses are of a single type, the lenses have different effects on lamp beads of different colors. Thus, mixed light is uneven or brightness is not inconsistent, boundary area, bright-dark area which are distinct appear in the lighting area of the lighting device, and the lighting effect is affected.

SUMMARY

A light-mixing cover according to one or more embodiments of the present disclosure includes a base plate and multiple lens groups, the base plate having a lens plane, the multiple lens groups being arranged on the lens plane in a first direction, at least one of the lens groups including multiple lenses, the multiple lenses being spaced in a second direction, at least one of the lenses being different in structure from an adjacent lens, the first direction being perpendicular to the second direction, each of the lenses having an incident surface and an exit surface, the incident surface being disposed opposite to the exit surface, the incident surface being configured to receive and direct light to be refracted, and the exit surface being configured to receive and direct out refracted light.

A lighting device according to one or more embodiments of the present disclosure includes a housing having an open end and an installation cavity connected to the open end; a lamp board installed in the installation cavity through the open end; and a light-mixing cover connected to the lamp board to cover the open end. The lamp board is provided with multiple light source groups, each of the light source groups being disposed opposite to one of the lens groups, at least one of the light source groups includes multiple lamp beads, at least one of the lamp beads is different from adjacent lamp beads in structure.

LIST OF REFERENCE SIGNS

DETAILED DESCRIPTION

In the description of the present disclosure, it is to be noted that an directional or positional relationship indicated by terms “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “in”, “out”, etc., is an orientation or position relationship shown in the drawings, merely for ease of description of the present disclosure and simplification of the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation. Therefore, it is not to be construed as limiting the present disclosure.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure belongs. The terms used in the description of the disclosure herein is for a purpose of describing specific embodiments only and is not intended to limit the disclosure.

A light-mixing cover1shown inFIGS.1and2includes a base plate having a lens plane101, and multiple lens groups disposed on the lens plane101in a first direction to form an array of lens groups. One lens group includes multiple lenses spaced in a second direction to form an array of lenses. In the lens group, at least one lens and an adjacent lens are different in structure. The first direction is perpendicular to the second direction.

Referring toFIGS.3and4, the lens has an incident surface and an exit surface which are disposed on opposite sides of the lens. The incident surface is used to receive light and direct the light to be refracted, and the exit surface is used to receive refracted light and direct the refracted light out.

Note that the first direction may be a length direction of the lens plane101, then the second direction is a width direction of the lens plane101. Also, the first direction may be a width direction of the lens plane101, then the corresponding second direction is a length direction of the lens plane101. Also, the first direction may be a diagonal direction from left to right on the lens plane101, then the corresponding second direction is a diagonal direction from right to left on the lens plane101.

According to one or more embodiments of the present disclosure, regardless of lens groups and lens are arranged on the lens plane101in which manner as mentioned above, same effect can be achieved.

In the following, a first arrangement manner is explained as an example. The first direction is the length direction of the lens plane101, and the second direction is the width direction of the lens plane101.

Based on the above structure, when the light-mixing cover1according to one or more embodiments of the present disclosure is used, multiple different lenses are combined to form a lens group, and at least one lens and an adjacent lens are different in structure. Multiple lens groups are disposed on a base plate in the first direction, and lenses in the lens groups are disposed on the base plate in the second direction. Thus the multiple lenses can be arranged to form an array.

When the light-mixing cover1and the housing3are assembled, the incident surface of the lens on the light-mixing cover1may be disposed toward a lamp board in the housing3, and the light-mixing cover1is connected to the housing3. Each lens on the light-mixing cover1corresponds to one light source point on the lamp board. The incident surface of the lens receives the light emitted by the light source point and the light is refracted, so that light energy is concentrated and a light beam angle is reduced. After light-concentrating and light-mixing, the refracted light is received and directed out by the exit surface, thereby forming a lighted area with uniform brightness and no distinct boundary in the lighting area.

The lens according one or more embodiments is provided on the lens plane101of the base plate, and the lens and the base plate are integrally molded by injection molding. The base plate of the light-mixing cover1may be made of a transparent or translucent material, and may be made of a material having certain transmittance such as organic glass or transparent plastic, depending on the actual use.

It should be noted that, in a lens group, at least one lens and an adjacent lens are different in structure. The difference may be in size, specifically, different in diameter or thickness. Alternatively, during assembly, a mounting height of at least one lens with respect to the lens plane101is greater than a mounting height of an adjacent lens with respect to the lens plane101.

When such a lens group is used in conjunction with a light source module, a lens having a large size may be provided opposite to a lamp bead having a large volume, so that light emitted by a lamp bead of a large volume can be incident more onto the lens, thereby improving utilization rate of light. A lens having a large height on the lens plane101may be provided opposite to a lamp bead having a small height on the lamp board, so that a distance from each lamp bead to an opposite lens is same, thereby achieving a same light-mixing effect.

Further, the lens group includes a first lens11and a second lens12, the first lens11and the second lens12have different structures, and the first lens11and the second lens12in a same lens group are spaced on the lens plane101in the second direction.

Based on this structure, same or different number of first lenses11and second lenses12may be provided in a lens group, and the first lens11and the second lens12are different lenses. Specifically, the first lens11and the second lens12are different in lens size, and may be different in diameter or thickness. During assembly, mounting heights of the two kinds of lenses with respect to the lens plane101may also be different to accommodate different light source modules.

After multiple first lenses11and multiple second lenses12are spaced along the first direction and the second direction of the lens plane101, a lens array arranged in an orderly manner and having a uniform structure is formed on the base plate. When used in conjunction with the lamp board, the lenses on the light-mixing cover1are uniformly arranged, so that the light emitted from the lamp board can be better received and refracted, thereby improving the utilization rate and intensity of light.

In one or more embodiments, both the first lens11and the second lens12are convex lenses. The first lens11has a first incident surface111on which a first convex portion112is provided, and the second lens12has a second incident surface121on which a second convex portion122is provided. Both the first convex portion112and the second convex portion122are configured to receive and direct the light to be refracted to form exit light which is concentrated and collimated.

A distance from a highest point on the first convex portion112to the lens plane101is H1, and a distance from a highest point on the second convex portion122to the lens plane101is H2, where H1 is greater than H2.

It should be noted that a surface of the convex portion on the incident surface is an arc surface. The arc surface has multiple points with different heights with respect to the lens plane101, and a point on the arc surface with a farthest distance to the lens plane101is the highest point.

Based on this structure, when the lens group is assembled with the base plate, the first lens11and the second lens12are disposed at different heights with respect to the lens plane101, respectively, and then arranged in an array to form a lens array having different heights. When the light-mixing cover1is assembled with the lamp board, since the lamp board has different lamp beads, and heights of the different lamp beads with respect to the light source base plate201are different, a first lens11having a large height on the light-mixing cover1is disposed opposite to a lamp bead having a relatively low height on the light source base plate201, and a second lens12having a relatively small height on the light-mixing cover1is disposed opposite to a lamp bead having a relatively large height on the light source base plate201.

In this way, the first lens11and the second lens12can be disposed respectively opposite to light source points of different specifications on the lamp board, so that a distance between each lens and an opposite light source points is same. In use, since the distance between each lens and the opposite lamp bead is same, paths of light emitted by different lamp beads after passing through the lens are substantially consistent, and the illuminance is uniform after passing through the lens, so that a concentrated and uniformly mixed lighting region is formed.

It should be noted that the first lens11and the second lens12disposed at different heights respectively with respect to the lens plane101may be provided in the following ways:

First, two lenses having different thicknesses respectively are used, and an overall thickness of the first lens11is greater than that of the second lens12. When the first lens11and the second lens12are disposed on the base plate, a distance H1 between a highest point of a first lens11having a greater thickness and the lens plane101is greater than the distance H2 between the highest point of the second lens12and the lens plane101.

Second, a first mounting portion and a second mounting portion having different heights respectively are provided on the lens plane101. A height of the first mounting portion relative to the lens plane101is greater than a height of the second mounting portion relative to the lens plane101. The first lens11is provided on the first mounting portion, and the second lens12is provided on the second mounting portion. Thus, the distance between the highest point of the first lens11and the lens plane101is greater than the distance between the highest point of the second lens12and the lens plane101, so that the two types of lenses can be used in conjunction with different lamp beads on the lamp board.

In one or more embodiments, both the first lens11and the second lens12are Fresnel lenses, the first lens11has a first incident surface111, a first convex portion112is provided in a middle portion of the first incident surface111, multiple concentric first tooth rings113are provided on the first incident surface111convexly, and the multiple first tooth rings113are provided around an outer periphery of the first convex portion112.

Similarly, the second lens12has a second incident surface121, a second convex portion122is provided in a middle portion of the second incident surface121, multiple concentric first tooth rings123are provided on the second incident surface121convexly, and the multiple second tooth rings123are provided around an outer periphery of the second convex portion122.

Based on this structure, when the lens group is assembled with the base plate, the first lens11and the second lens12are respectively disposed at different heights with respect to the lens plane101to form a lens array having different heights. When the light-mixing cover1is assembled with the lamp board, since the lamp board has different lamp beads, and heights of the different lamp beads with respect to the light source base plate201are different, a first lens11having a large height on the light-mixing cover1is disposed opposite to a lamp bead having a relatively low height on the light source base plate201, and a second lens12having a relatively small height on the light-mixing cover1is disposed opposite to a lamp bead having a relatively large height on the light source base plate201.

In this way, the first lens11and the second lens12can be disposed respectively opposite to light source points of different specifications on the lamp board, so that a distance between each lens and an opposite light source points is same. In use, since the distance between each lens and the opposite lamp bead is same, paths of light emitted by different lamp beads after passing through the lens are substantially consistent, and the illuminance is uniform after passing through the lens, so that a concentrated and uniformly mixed lighting region is formed.

It should be noted that, conventionally, a Fresnel lens may be formed by removing as many optical materials as possible while curvature of a surface of a convex lens is retained, so that multiple groove portions are formed on the surface of the Fresnel lens, thereby achieving a same concentrating effect while reducing weight.

Referring toFIGS.3and4, a convex portion in middle of the incident surface of the first lens11or the second lens12is a convex lens, and multiple tooth rings around the convex portion are provided on the incident surface. Each of the tooth rings has a vertical wall perpendicular to the lens plane101and an inclined wall provided at an included angle to the lens plane101, and the vertical wall intersects the inclined wall.

Depending on an incident angle of light, part of the light emitted from the lamp beads is incident on the convex portion in the middle of the incident surface, exit light is formed after refraction at the convex-transparent portion and is directed out of the incident surface. An exit light beam angle is less than an incident light beam angle, and the light is concentrated and mixed.

Also, part of the light emitted by the beads is incident on the tooth ring outside the convex portion. Since the tooth ring is in a tooth shape, and is formed by intersection of a vertical wall and an inclined wall. The light is concentrated on the tooth ring as follows: Part of the light is incident on the inclined wall of the tooth ring. The part of the light is first refracted on the inclined wall to form concentrated light which is then directed out by the exit surface.

Also, part of the light is incident on the vertical wall of the tooth ring, and the part of the light has light having a large incident angle and light having a small incident angle. When incident on the vertical wall, the light having a small incident angle is directly refracted on the vertical wall to form concentrated light which is then directed out by the exit surface;

When incident onto the vertical wall, the light having a large incident angle is totally reflected on the vertical wall to be incident on the inclined wall, and refracted on the inclined wall to form a light beam having a small incident angle. Concentrated light is directed out by the exit surface.

In addition, height of a tooth ring close to an edge of the lens with respect to the lens plane101and height of a tooth ring close to a center of the lens with respect to the lens plane101are same, so that concentrating and mixing effects on light are same.

It should be noted that the number of the first tooth rings113and the number of the second tooth rings123may be same or different. The distance between each of the lenses and the opposite lamp bead is same, while different lamp beads have different volumes and different corresponding light-emitting angles. Thus, in order to match volumes of the lens and the lamp bead, an overall size of the second lens12may be set greater than an overall size of the first lens11.

A lens having a greater overall size also corresponds to a greater weight, so that the number of the second tooth rings123may be set greater than the number of the first tooth rings113. A greater number of second tooth rings123are provided on the outer periphery of the second convex portion122, so that weight of the second lens12can be further reduced and concentrating effect of the second lens12can be enhanced. Each tooth ring is equivalent to an independent lenslet, so that light can be adjusted to be converged, thereby improving the utilization rate of the light.

In this way, during assembly, the second lens12may be provided opposite to a lamp bead having a greater volume on the lamp board. The number of the second tooth rings123is greater, and the overall size of the second lens12is greater. Thus, the second lens12can receive more light, the amount of light having a greater angle emitted by the lamp bead which is incident out of the lens is reduced, the utilization rate of the light is improved, and the light is concentrated and mixed uniformly, thereby obtaining a lighting area with uniform brightness.

The light-mixing cover1according to one or more embodiments is formed by arranging multiple Fresnel lens arrays having different structures. The light-mixing cover1is thin in thickness and light in weight as a whole to achieve the effects of light concentration and uniform light-mixing, and is easy to process to effectively reduce costs.

Further, referring toFIG.1, two adjacent lenses in the first direction are staggered, and a center distance between the two lenses is m. A center distance between two adjacent lenses in the second direction is n. A ratio of n to m is 1.

It should be noted that the center distance of the two lenses described herein includes a linear distance from a center of a lens to a center of an adjacent lens.

Based on this structure, two adjacent lenses in the first direction are staggered so that projections of the two lenses in the first direction overlap. When the lenses are spaced in the first direction, a center distance between two adjacent lenses is set to m. When the lenses are spaced in the second direction, a center distance between two adjacent lenses in a same lens group is set to n. A ratio of n to m is 1.

In a lens array thus formed, although the first lens11and the second lens12are different in structure, the center distance between two adjacent lenses in the first direction is same as the center distance between two adjacent lenses in the second direction, that is, distances between any one lens and various adjacent lenses respectively are same. The lens array thus formed is stable in structure and uniform in arrangement.

In addition, since two adjacent lenses in the first direction are staggered, the lens array can mix light of different colors or different color temperatures in a staggered manner when receiving the light from the lamp board, so that the light can be further scattered, and the light-mixing effect is better.

If the ratio of n to m is less than 1, a spacing distance between two adjacent lenses in the first direction is greater than a spacing distance between two adjacent lenses in the second direction. In use, since the spacing distance between lenses in the second direction is small, area of light falling on a spacing between lenses is small, and the lens can receive more light.

However, since the distance between the lenses in the first direction is large, area of light falling on a spacing between lens is large, and the light that can be received by the lens become less. In this direction, part of the light passing through the lens and part of the light passing through the spacing between lenses are presented as bright and dark on the lighting area. In addition, the light passes through the light-mixing cover1and falls on the lighting area, and the brightness presented in two perpendicular directions may also be inconsistent.

When the ratio of n to m is greater than 1, the above-mentioned consequences may also occur, which is not described too much herein. Therefore, the lenses are equidistantly arranged in both the first direction and the second direction, so that the light-mixing effect of the light-mixing cover1can be enhanced.

Further, the first lens11has a first exit surface114, and the first incident surface111and the first exit surface114are sequentially arranged in a direction of light incidence. The second lens12has a second exit surface124, and the second incident surface121and the second exit surface124are sequentially arranged in the direction of light incidence.

Both the first exit surface114and the second exit surface124are configured to receive and direct out light refracted by the first incident surface111and the second incident surface112, and are provided with multiple bead surfaces13. The bead surfaces13are convex in a direction away from the first exit surface114and the second exit surface124, and are configured to increase haze of the first exit surface114and the second exit surface124so that the light is further uniformly mixed.

Based on this structure, the incident surface and the exit surface are provided on two sides of the lens. When the light-mixing cover1is assembled with the lamp board, the incident surface is provided toward a light-emitting surface of the lamp board, and the exit surface is provided opposite to the light-emitting surface of the lamp board. Continuous bead surfaces13are provided on the exit surface, and the bead surface13is convex with respect to the exit surface, so that the exit surface has an uneven structure.

In this way, when the light is incident on the lens, the light is received and is directed to be refracted by the incident surface. Since angles of the light incident on the incident surface are different, angles of refracted light are different, and the light can be scattered to be mixed. The refracted light is received and directed out by the exit surface. When directed out, a direct angle of light is changed by passing through the bead surface13, and the light is further diffused uniformly, thereby further improving the light-mixing effect. The bead surface13is capable of increasing the haze of the exit surface, effectively preventing stray light from being directly toward the human eye, and preventing glare from causing visual fatigue.

In addition, the exit surface of the lens may be sanded to form a honeycomb concave-convex structure, so that the haze of the exit surface is increased, and direct light is diffusely reflected on a sanded structure, thus further uniformly mixing the light. In this way, the transmittance is ensured, and eye discomfort caused by glare generated when the user looks directly at the light is prevented.

It should be noted that the incident surface of the lens may be provided with a texture or a sanded process. When the light source is a multi-color light source, the uniform effect of light-mixing may be further improved.

Further, the lens plane101is circumferentially provided with and surrounded by a protruding edge102, a placement space is defined by the protruding edge102, multiple lens groups are installed in the placement space, multiple protruding ribs103are evenly spaced in the placement space, the multiple protruding ribs103are distributed in the first direction, and an installation compartment is defined between two adjacent protruding ribs103, and each installation compartment is provided with a lens group. The protruding edge102is configured to connect to a housing3, and the protruding rib103is used for increasing strength of the base plate and isolating light of two adjacent lens groups.

Based on this structure, when the light-mixing cover1is assembled with the housing3, a side of the light-mixing cover1provided with a protruding edge102is provided toward the housing3, and the housing3has an open end. A circumferential groove may be provided around the edge of the open end, so that the protruding edge102is clamped with the groove correspondingly, thereby connecting the light-mixing cover1and the housing3.

Multiple protruding ribs103are also provided in the placement space. The multiple protruding ribs103divide the placement space into multiple identical installation compartments. Width of each of the installation compartments is at least greater than an overall diameter of the second lens12, so that the lens group can be completely accommodated. Each lens group is installed to an installation compartment respectively, and a linear distance between two adjacent lens groups is equal to a distance between two adjacent lenses within a same lens group, thereby forming a lens array.

The protruding rib103can increase strength of the light-mixing cover1. In order to ensure the transmittance of the light-mixing cover1, the light-mixing cover1is made light and thin, so as to improve the light intensity. However, since the thickness is relatively thin, the strength of the light-mixing cover1may be not enough. In a mounting process, there may be a case where the light-mixing cover1is damaged by pressing. The protruding rib103is provided on the base plate, so that the strength of the light-mixing cover1can be increased, and the light-mixing cover1is not easily damaged by force.

It should be noted that a distance between an end surface of the protruding rib103away from the lens plane101and the lens plane101is H3, which is greater than H1, so that the protruding rib103can better isolate two adjacent lens groups, where H1 is the distance between the highest point on the first lens11and the lens plane101.

During use after assembling the light-mixing cover1with the lamp board, in the first direction, part of light emitted by the lamp beads is incident on a directly opposite lens, and part of the light is incident on an adjacent lens. Since a height of the protruding rib103with respect to the lens plane101is greater than a height of the lens group with respect to the lens plane101, that is, the protruding rib103is higher than the height of any one of the lenses, when the protruding rib103is disposed between two adjacent lens groups, light can be blocked from a side of the lens group. Light of the lamp beads is prevented from being transmitted to an adjacent lens group to cause light to cross-talk with each other, thereby improving the light-concentrating and light-mixing effects of the light-mixing cover1.

Further, multiple fixing columns104are provided on the protruding ribs103at intervals, and the fixing columns104are used for connecting to the lamp board. Two sides of the base plate are provided with an avoidance area105for providing avoidance space for a magnet member on the housing3.

Based on this structure, when the light-mixing cover1is assembled with the lamp board in the housing3, multiple fixing columns104are provided on the protruding ribs103of the light-mixing cover1, and multiple fixing holes23are provided on the lamp board. There is a one-to-one correspondence between the fixing columns104and the fixing holes23, so that a connection between the light-mixing cover1and the lamp board is realized, and pre-positioning before the light-mixing cover1is connected to the housing3is realized. The protruding edge102on the lens plane101of the light-mixing cover1is connected to periphery of the housing3, for example, an adhesive is provided on the protruding edge102, and the protruding edge102is adhered to the housing3.

In this process, since a magnet member configured to connect to an external function member is provided on an end surface of the housing3facing the light-mixing cover1convexly, avoidance areas105on two sides of the light-mixing cover1can provide extension space for the magnet member, and the light-mixing cover1is connected to the end surface of the housing3after avoiding the magnet member.

When the light-mixing cover1is connected to the lamp board, there is a one-to-one correspondence with the lens of the light-mixing cover1and the lamp bead on the lamp board. Moreover, the height of the protruding rib103with respect to the lens plane101is greater than the height of the lens group with respect to the lens plane101. The protruding rib103can prevent the lens and the lamp bead from squeezing each other during the connection between the light-mixing cover1and the lamp board.

Referring toFIG.5, a lighting device according to one or more embodiments of the present disclosure includes the light-mixing cover1described above, a housing3, and a lamp board2. Specifically, the housing3includes an open end and an installation cavity connected to the installation cavity, the lamp board2is installed into the installation cavity through the open end, and the light-mixing cover1is connected to the lamp board2to cover the open end.

The lamp board2includes a light source base plate201provided with multiple light source groups. Each light source group corresponds to a lens group. The light source group includes multiple lamp beads, and at least one lamp bead is different from an adjacent lamp bead in structure.

During assembly, the lamp board2and the light-mixing cover1are installed in the housing3in sequence. Specifically, multiple mounting holes24may be provided on the light source base plate201, and the light source base plate201is connected to an inner end wall of the housing3by a screw member. When the light-mixing cover1and the lamp board2are assembled, the incident surface of the lens group is disposed toward the light source group, a lens is disposed opposite to a lamp bead. The light source base plate201may be provided with multiple fixing holes23, so that the light-mixing cover1is connected to the fixing holes23of the light source base plate201by the fixing columns104on the protruding ribs103. Finally, the protruding edge102of the light-mixing cover1is glued to the periphery of the open end of the housing3so that the light-mixing cover1covers the open end.

In this way, when the light-mixing cover1and the lamp board2are provided correspondingly, each lens corresponds to one lamp bead. Light emitted by the lamp bead enters the lens, the angle of the light becomes smaller after refraction, the light is converged, and light of multiple colors is uniformly mixed in the refraction process. Thus, the lighting device can achieve a lighting region with uniform brightness and without distinct boundary.

There are at least two different structures of lamp beads on the light source base plate201. The difference is in number of chips in the lamp beads, lighting angles of the lamp beads, etc.

Further, referring toFIG.6, the light source group includes a first lamp bead21and a second lamp bead22, and the first lamp bead21and the second lamp bead22are different in structure.

Based on this structure, when the light-mixing cover1is assembled with the light source group, the incident surface of the lens group is disposed toward the light source group. The first lamp bead21may be a single-chip bead, and the second lamp bead22may be a multi-chip bead, so that volume of such first lamp bead21is smaller than volume of the second lamp bead22. The first lens11on the light-mixing cover1is provided opposite to the first lamp bead21, and the second lens12is provided opposite to the second lamp bead22.

Thus, since the first lens11is higher than the second lens12and the first lamp bead21is smaller than the second lamp bead22in volume, a distance between the first lamp bead21and the first lens11is consistent with a distance between the second lamp bead22and the second lens12. In this way, paths of the light emitted by two kinds of beads to the lens12are consistent, and the light emitted by different beads are uniform when transmitted to the lighting area, so that non-uniform brightness does not occur.

When incident on the lens, the light is received and directed to be refracted by the incident surface. Since the angles of the light incident on the incident surface are different and the angles of the refracted light are different, the light can be scattered to be mixed. There is a bead surface13on the exit surface of the lens group. The bead surface13is convex in a direction away from the exit surface. The refracted light is received and directed out by the exit surface. When directed out, a direct angle of light is changed by passing through the bead surface13, and the light is further diffused uniformly, thereby further improving the light-mixing effect. The bead surface13is capable of increasing the haze of the exit surface, and effectively preventing stray light from being directly toward the human eye.

Further, the first lamp bead21includes a white LED lamp bead and the second lamp bead22includes a red LED lamp bead and/or a green LED lamp bead and/or a blue LED lamp bead.

Based on this structure, the white LED lamp bead has a single chip. When the second lamp bead22is one of a red LED lamp bead or a green LED lamp bead or a blue LED lamp bead, the second lamp bead22also has a single chip. The first lamp bead21and the second lamp bead22have a same volume and different colors. When the beads are used in conjunction with the lenses, the lenses can refract light of different colors emitted by the beads to realize light concentration and uniform color mixing.

When chips of the second lamp bead22includes three types of chips: a red light chip, a green light chip, and a blue light chip, the second lamp bead22has a large volume. In this case, the first lamp bead21and the second lamp bead22have different volumes and different light-emitting angles. When the beads are used in conjunction with the lenses, the first lamp beads21are disposed opposite to the first lens11of a small size, and the second lamp beads22are disposed opposite to the second lens12of a large size.

The light emitted by the lamp beads are refracted and collimated when passing through the incident surface of the lens. Since the exit surface of the lens is the bead surface13or is provided with texture, when the light pass through the exit surface of the lens, the exit surface can refract and pull a circular spot of the lamp beads to form an elliptical spot, and further perform light-mixing and color-mixing.

It is an object of one or more embodiments of the present disclosure to provide a light-mixing cover, in which different lenses are provided on a base plate, so as to prevent the lens types on a plate lens from being single, and to prevent a distinct boundary area and a bright-dark area from appearing in a lighting area after the lens receives different light.

It is an object of the present disclosure to provide a lighting device in which a lens on a base plate of a light-mixing cover can prevent multiple kinds of lamp beads from emitting light, and prevent a distinct boundary area and a bright-dark area appearing in a lighting area.

One or more embodiments of the present disclosure have an advantage that the light-mixing cover is provided with lenses of different structures in an array, and there is a one-to-one correspondence between the lenses and the lamp beads of different specifications on the lamp board. In use, the light-mixing cover is capable of concentrating light emitted by the lamp beads, and is capable of uniformly mixing light of different colors or different color temperatures. A distance between each bead and an opposite lens is same, and the light can be further mixed uniformly.

Some embodiments of the present disclosure are described above, but the scope of the present disclosure is not limited thereto. Any modifications or equivalent substitutions that can readily occur to those skilled in the art based on the present disclosure are intended to fall within the scope of the present disclosure.