WO2019192280A1

WO2019192280A1 - Night projection lamp

Info

Publication number: WO2019192280A1
Application number: PCT/CN2019/077063
Authority: WO
Inventors: 龙涛; 黄帆; 邹诚
Original assignee: 超视界激光科技（苏州）有限公司
Priority date: 2018-04-02
Filing date: 2019-03-05
Publication date: 2019-10-10

Abstract

A night projection lamp, comprising an LED light source (10), a first stop (20), a beam splitting unit (40), a collimating lens (50), and a reflective mirror array (60) in sequence along an optical path. The first stop (20) is provided close to a light-emitting surface of the LED light source (10), and is provided with a first light passing hole (210) corresponding to the light-emitting surface of the LED light source (10) in position. The size of the first light passing hole (210) is less than that of the light-emitting surface of the LED light source (10). The first stop (20) is provided, and the first light passing hole (210) corresponding to the LED light source (10) in position are disposed on the first stop (210) for transmitting the light emitted by the LED light source (10). Moreover, the size of the first light passing hole (210) is less than that of the LED light source (10), thereby decreasing the size of a light spot, improving the brightness thereof, significantly simplifying the structure of the projection lamp, and reducing the occupying volume thereof without providing other components such as a focusing lens.

Description

Star projector

Technical field

The invention relates to the technical field of illumination, and in particular to a starlight projection lamp.

Background technique

Starlight projection lamp is a kind of decorative lighting device that projects countless stars or snowflakes on walls, ceilings and lawns. It can be used indoors such as KTV box, outdoor such as courtyard, lawn and plants to create atmosphere and decoration. The role of the landscape has a very wide range of applications in life.

At present, the star projectors on the market use laser diodes as the light source, but the laser diodes are almost all red, green and blue, and cannot effectively synthesize white, so it is difficult to form a white pattern. In addition, the current starlight projection lamp is usually a monochrome projection lamp, which requires a plurality of projection lamps to achieve a color effect, is inconvenient to use, and the existing starlight projection lamp has a large volume and a high cost, failing to meet the needs of practical applications. In addition, the number of stars projected by the existing star projectors is limited, which affects the starry sky projection effect.

Summary of the invention

The present invention provides an LED star sky projection lamp with small size, simple structure and high brightness for the problems existing in the prior art.

In order to solve the above technical problem, the technical solution of the present invention is:

A starlight projection lamp, comprising an LED light source, a first aperture, a beam splitting unit, a collimating lens and a mirror array in sequence along the optical path, wherein the first aperture is disposed adjacent to the light emitting surface of the LED light source, the first aperture And a first light-passing hole corresponding to the light-emitting surface of the LED light source, wherein the size of the first light-passing hole is smaller than the size of the light-emitting surface of the LED light source.

Further, a bracket for mounting the LED light source and the first diaphragm is further included, a top of the bracket is higher than a top of the LED light source, and the first diaphragm is disposed at a top of the bracket.

Further, the distance between the first aperture and the light emitting surface of the LED light source is less than 1 mm.

Further, the first aperture is provided with a plurality of spaced patterns.

Further, the splitting unit is composed of a plurality of mirrors, and the reflecting surfaces of any two mirrors are not coplanar.

Further, the side and the bottom of the LED light source are covered with silica gel, and the LED light source is fixed in the silica gel.

The invention also provides an LED star sky projection lamp, comprising an LED light source, a first aperture, a second aperture, a collimating lens and a mirror array arranged in sequence along the optical path, wherein the first aperture is provided with an LED a first light-passing hole corresponding to the position of the light source, and a second light-passing hole corresponding to the position of the first light-passing hole, wherein the size of the first light-passing hole is smaller than the LED light source The size of the light emitting surface, the second light passing hole collects the light angle smaller than the light collecting angle of the first light passing hole.

Further, the bracket further includes: the LED light source, the first aperture, and the second aperture are sequentially disposed on the bracket,

Further, the LED light source includes at least two LED units arranged in a gap and having different illumination colors.

Further, the first aperture includes at least two first light-passing holes, and the positions of the first light-passing holes are in one-to-one correspondence with the LED units in the LED light source.

Further, an opaque layer is disposed between two adjacent LED units.

Further, the method further includes a splitting unit located in front of the collimating lens along the optical path, the splitting unit being composed of a plurality of mirrors, and the reflecting surfaces of any two mirrors are not coplanar.

Further, a distance between the first aperture and the light emitting surface of the LED light source is less than 1 mm.

Further, a driving mechanism connected to the mirror array is further included to drive the mirror array to rotate.

The starlight projection lamp provided by the present invention includes an LED light source, a first aperture, a beam splitting unit, a collimating lens, a mirror array, and a bracket for mounting the LED light source and the first aperture, respectively, along the optical path. a first light-passing hole corresponding to the light-emitting surface of the LED light source is disposed on the first light-spot, and the first light-passing hole is smaller than the LED light source. The size of the light emitting surface. The first aperture is provided with a first light-passing hole corresponding to the light source, and the size of the first light-passing hole is smaller than the size of the LED light source. The first light-passing hole corresponding to the LED light source is disposed on the first light beam by the first light diaphragm, and is configured to transmit the light emitted by the LED light source, and the size of the first light-passing hole is smaller than the size of the LED light source Therefore, the size of the spot is reduced, the brightness of the spot is improved, and other components such as a focus lens are not required, which greatly reduces the structure and the occupied volume of the lamp. In addition, a second aperture is disposed along the optical path of the first aperture, and a second aperture is disposed on the second aperture, and an incident angle of the light source projected to the first aperture through the adjacent source is greater than the The second light-passing hole corresponding to the first light-passing hole is half of the collecting angle of the light, so that the stray light emitted from the first light-passing hole is well shielded, thereby further improving the star-sky projection effect, and the star-light projection lamp of the present invention The projection effect of multiple colors is realized, and the cost is low, and the application is extensive.

DRAWINGS

1 is a schematic view showing a specific structure of a starlight projection lamp in Embodiment 1 of the present invention;

2 is a schematic structural view of a specific embodiment of an LED light source according to Embodiment 1 of the present invention;

3 is a schematic view showing a specific structure of a starlight projection lamp in Embodiment 2 of the present invention;

4 is a schematic view showing the operation of the LED light source and the first and second apertures corresponding to FIG. 3;

Figure 5 is a schematic structural view of a bracket in Embodiment 2 of the present invention;

6 is a schematic structural view of a star-light projection lamp in Embodiment 3 of the present invention;

7 is a schematic view showing the operation of the LED light source and the first and second apertures corresponding to FIG. 5;

FIG. 8 is a schematic structural view of the LED light source corresponding to FIG. 5.

The figure shows: 10, LED light source; 120, opaque layer; 130, PCB substrate; 140, silica gel; 20, first aperture; 210, first light aperture; 30, second aperture; a second light passing hole; 40, a splitting unit; 410, a mirror; 50, a collimating lens; 60, a mirror array; 610, a small mirror; 70, a bracket; 710, a groove; 720, a first step; 730, second step; 80, drive mechanism.

detailed description

The invention will now be described in detail in conjunction with the drawings.

Example 1

As shown in FIG. 1, the present invention provides a starry sky projection lamp including an LED light source 10, a first aperture 20, a beam splitting unit 40, a collimating lens 50, and a mirror array 60 in sequence along the optical path. The first aperture 20 is provided with a first light-passing hole 210 corresponding to the LED light source 10, and the size of the first light-passing hole 210 is smaller than the size of the light-emitting surface of the LED light source 10. Specifically, the LED light source 10 includes an LED chip supported by the bracket 70, and the first aperture 20 is directly attached to the top of the bracket 120. In FIG. 1, the first aperture 20 is directly disposed above the bracket 70, and of course A first step adapted to the first aperture 20 may be provided on the bracket 70 to limit the first aperture 20 to the first step. A first light-passing hole 210 corresponding to the LED light source 10 is disposed on the first aperture 20 for transmitting light emitted by the LED chip 110, and the size of the first light-passing hole 210 is smaller than the size of the light-emitting surface of the LED light source 10 Therefore, the size of the spot is reduced, the brightness of the spot is improved, and other components such as a focus lens are not required, which greatly reduces the structure and the occupied volume of the lamp.

Preferably, the starlight projection lamp further includes a bracket 70 for mounting the LED light source 10 and the first aperture. In this embodiment, the LED light source 10 and the first aperture are mounted on the same bracket 70, and of course, can also be installed. On the different brackets 70, according to actual needs, as shown in FIG. 1, the top of the bracket 120 is higher than the top of the LED light source 10, and the first aperture 20 is attached to the top of the bracket 70. Of course, the top of the bracket 70 can also be higher than the first aperture 70. In this case, it is only necessary to provide a step corresponding to the first aperture 20 on the bracket 70 to limit it.

Preferably, the distance between the first aperture 20 and the light emitting surface of the LED light source 10 is less than 1 mm. Specifically, since the surface temperature of the LED chip is high, the first aperture 20 cannot be directly attached to the LED chip. Of course, the distance between the first aperture 20 and the LED chip cannot be too large, so as not to affect the focusing effect of the spot, and affecting The brightness of the lamp.

Preferably, the first aperture 20 is provided with a plurality of spaced patterns. Specifically, the light beams emitted by the LED light source 10 are divided into a plurality of light beams after being arranged in a spaced pattern, and the shapes of the patterns may be different, thereby increasing the diversity of the illumination patterns and the number of projection patterns.

Preferably, the beam splitting unit 40 is composed of a plurality of mirrors 410, and the reflecting surfaces of any two mirrors 410 are not coplanar. In this way, after the reflection by the beam splitting unit 40, a beam of light is divided into a plurality of sub-beams having different propagation angles. The beam sections of different sub-beams may be the same or different, and since the mirror does not change the divergence state of the beam, each beam The beam is still a divergent beam. In addition to the mirror, the beam splitting unit 40 may also use other optical components, such as prisms, as long as it can divide a beam of light into light of different beam propagation angles. In the present embodiment, the number of sub-beams formed by the beam splitting unit 40 is 2 or more.

Preferably, the bottom of the LED light source 10 is provided with a PCB substrate 130. Specifically, in this embodiment, the bracket 70 is directly disposed on the PCB substrate 130. Of course, the LED light source 10 can be directly disposed on the PCB substrate 130. The PCB substrate 130 is made of aluminum or copper material, and has good heat conduction effect. The heat generated on the LED light source 10 is quickly dissipated.

Referring to FIG. 1 , a middle portion of the bracket 70 is provided with a recess 710 corresponding to the LED light source 10 , and the LED light source 10 is disposed in the recess 710 . The LED light source 10 is positioned by the recess 710 to prevent its movement relative to the bracket 70.

As shown in FIG. 2, in another LED light source 10 structure, the side and the bottom of the LED light source 10 are covered with a silica gel 140. The top of the silica gel 140 is not lower than the top of the LED light source 10, that is, the LED light source 10 The fixing is performed by the silica gel 140, and the two are integrated and placed in the holder 70, and the three do not move relative to each other.

In this embodiment, after the collimating lens 50 is disposed in the beam splitting unit 40, the plurality of diverged sub-beams split by the splitting unit 40 are collimated by the collimating lens 50 to become a plurality of parallel beams. . Each parallel beam corresponds to a split beam sub-beam, and different parallel beams have different propagation angles. The splitting unit 40 has another function of dividing a beam of a large beam section into a plurality of sub-beams of a small beam section. Since the beam section of each sub-beam is smaller, a collimator lens 50 of a small aperture can be selected, thereby reducing The volume of the entire system.

The plurality of parallel sub-beams that are collimated by the collimating lens 50 are finally incident on the mirror array 60 to form an infinite number of projection patterns. In this embodiment, the mirror array 60 includes a plurality of small mirrors 610. Preferably, each of the small mirrors 610 is square, and the side length is 1-10 mm, and the number of small mirrors 610 is 40. In the above, since each small mirror 610 forms an image on the pattern projection on the pattern sheet, in order to obtain as many projection images as possible, the number of small mirrors 610 is as large as possible. The plurality of small mirrors 610 may be arranged regularly or in a disorderly manner. The reflecting surfaces of all the small mirrors 610 form a common reflecting surface, and the reflecting surface is preferably a curved surface, and the curved surface may be a concave surface or a convex surface. By arranging the small mirror arrays into curved surfaces, the patterns projected by all the small mirrors can be dispersed, and the curvature of the control surface can control the size of the pattern dispersion range. A preferred solution is to cut a large mirror into a 4 mm array of small mirrors and then attach it to a curved member so that a curved mirror array can be formed. If the splitting unit 40 divides a beam of light into M sub-beams while each sub-beam is incident on the mirror array 60, it covers the N small mirror units in the mirror array 60, so that it can be projected. M*N pattern images, and the patterns are spread out from each other on the projection surface to form a starry illumination effect. Thus, by the splitting action of the beam splitting unit 40, the number of projection patterns can be greatly increased in the case where the number of small mirrors included in the mirror array 60 is limited.

Preferably, the starlight projection lamp further comprises a driving mechanism 80 connected to the mirror array 60, and the driving mechanism 80 drives the mirror array 60 to rotate, thereby changing the outgoing direction of the light to form a dynamic projection effect.

Example 2

Different from Embodiment 1, as shown in FIG. 3, the starlight projection lamp provided by the present invention includes an LED light source 10, a first aperture 20, a second aperture 30, a collimating lens 50, and sequentially arranged along the optical path. The first aperture 20 is provided with a first light-passing aperture 210 corresponding to the LED light source 10, and the second aperture 30 is provided with a second light-passing aperture 310, the first pass The size of the light hole 210 is smaller than the size of the light emitting surface of the LED light source 10. The light collecting angle of the second light passing hole 310 is smaller than the collecting angle of the light by the first light passing hole 210. Specifically, the LED light source 10 is an LED chip, and its light emitting surface is equivalent to the upper surface of the chip. By providing the first aperture 20, a first light passing through the light emitting surface of the LED light source 10 is disposed on the first aperture 20 The hole 210, thereby reducing the size of the spot to project more stars, improving the projection effect; simultaneously setting the second aperture 30, providing the second aperture 30 on the second aperture 30, and the second aperture The collecting angle α of the pair of light rays 310 is smaller than the collecting angle β of the light passing through the first light passing hole 210, as shown in FIG. 4, thereby shielding the stray light emitted from the first light passing hole 210 well, thereby further improving the starry sky. Projection effect. It should be noted that the light collecting angle α of the first light passing hole 210 is the maximum angle formed by the light emitted by the LED light source 10 to the first light passing hole 210, and the light collecting angle of the second light passing hole 310 is collected. That is, the effective aperture of the second light-passing aperture 310 is opposite to the opening angle of the first light-passing aperture 210.

Preferably, the starlight projection lamp further includes a bracket 70, and the LED light source 10, the first aperture 20, and the second aperture 30 are sequentially disposed on the bracket 70. In this embodiment, the LED light source 10, the first The aperture 20 and the second aperture 30 are disposed on the same bracket 70. Of course, they may be disposed on different brackets 70, and are designed according to actual needs.

As shown in FIG. 5, the bracket 70 is respectively provided with a groove 710 adapted to the LED light source 10, and a first step 720 and a second aperture 30 adapted to the first aperture 20. In the second step 730, the LED light source 10 is located in the recess 710. In this embodiment, the recess 710 is provided with one, and the plurality of LED light sources 10 are integrated, and are disposed in the recess 710. The first aperture 20 is mounted on the first step 720, and the second aperture 30 is mounted on the second step 730. By providing the groove 710, the first step 720 and the third step 730 on the bracket 70, the positions of the LED light source 10, the first aperture 20 and the second aperture 30 are respectively defined to avoid relative movement thereof and affect projection. The effect is that the first step 720 and the second step 720 are convenient to control the gap between the LED light source 10, the first aperture 20 and the second aperture 30. Preferably, the first aperture 20 and the LED light source The distance between the two apertures is 0.2 to 1 mm, and the thickness of the first aperture 20 is less than 0.5 mm. Since the surface temperature of the LED light source 10 is high, the first aperture 20 cannot be directly attached to the LED light source 10, otherwise it is easy Damaged, affecting the service life, of course, the distance between the first aperture 20 and the LED light source 10 should not be too large, so as not to affect the brightness of the spot and ultimately affect the brightness of the star. The thickness of the first aperture 20 is controlled within 0.5 mm. When the thickness is large, the light entering the first light-passing aperture 210 is absorbed by the inner wall, which affects the brightness of the spot.

Preferably, the first aperture 20 and the second aperture 30 are both made of an opaque material. Specifically, the first aperture 20 and the second aperture 30 may be made of a metal material coated with a black layer, which can absorb light or reflect light while ensuring surface flatness.

Preferably, the starlight projection lamp further comprises a beam splitting unit 40 located in front of the collimating lens 50 along the optical path, the beam splitting unit 40 is composed of a plurality of mirrors 410, and the reflecting surfaces of any two mirrors 410 are not Coplanar. Thus, after the beams of different colors are reflected by the beam splitting unit 40, each beam of light is divided into a plurality of sub-beams having different propagation angles. The beam sections of different sub-beams may be the same or different, since the mirror 410 does not change the beam. Divergent state, so each beam of beam is still a divergent beam. In addition to the mirror 410, the beam splitting unit 40 may also use other optical components, such as prisms, as long as it can divide a beam of light into light of different beam propagation angles. In the present embodiment, the number of sub-beams formed by the beam splitting unit 40 is 2 or more.

Preferably, the second light-passing aperture 310 collects light at the same angle as the optical system of the optical system composed of the beam splitting unit 40 and the collimating lens 50. Specifically, the second light passing hole 310 only allows light in the light collecting angle of the optical system composed of the splitting unit 40 and the collimating lens 50 to pass, and all the light passing through can be collimated by the collimating lens 50 and projected onto the mirror. The array 60 is emitted and formed to form a starlight projection effect, and the light larger than the collection angle is absorbed or reflected by the second aperture 30 to avoid stray light and affect the illumination effect.

Example 3

As shown in FIG. 6, different from Embodiment 1-2, the starlight projection lamp includes at least two LED light sources 10 arranged in a gap and having different colors. Preferably, the first light passing through the first aperture 20 The holes 210 are in one-to-one correspondence with the LED light source 10. The second light-passing holes 310 on the second aperture 30 are in one-to-one correspondence with the first light-passing holes 210, and the LED light source 10 is projected to adjacent LEDs. The minimum incident angle of the first light-passing hole 210 corresponding to the light source 10 is greater than half of the light-collecting angle of the second light-passing hole 310 corresponding to the first light-passing hole 210. Specifically, a plurality of LED light sources 10 having different gaps and different colors are disposed to realize a star-shaped projection effect of a plurality of colors to meet a higher projection requirement. In this embodiment, the LED light sources 10 having four different colors are taken as an example, respectively. It is a red, green, blue and white LED light source 10, four different color LED light sources 10 are arranged to form a rectangle or a diamond shape or other shape, fixed on the mounting board, and there is no between the adjacent two LED light sources 10 The light transmissive layer 120 is as shown in FIG. 8 , so that the light emitted by one LED light source 10 is prevented from being projected from the side to the other LED light source 10 to form stray light, which affects the projection effect. The opaque layer 120 may be a diffuse reflective material. It can be made, for example, by using an aluminum plate or a mixture of silica and silica gel or a mixture of titanium oxide and silica gel or a mixture of silicon carbide and silica gel, although it is also possible to use other materials having a higher reflectance or a light absorbing material. By providing a first light-passing hole 210 having a smaller size than the light-emitting surface of the corresponding LED light source 10 on the first aperture 20, the size of the light spot is reduced to project more stars, thereby improving the projection effect; and at the same time in the second aperture A second light-passing hole 310 corresponding to the first light-passing hole 210 is disposed on the 30, and a minimum incident angle γ of the LED light source 10 projected to the first light-passing hole 210 corresponding to the adjacent LED light source 10 is greater than the first The second light-passing hole 310 corresponding to the light-passing hole 210 is half of the collection angle β of the light, as shown in FIG. 7, so that the stray light emitted from the first light-passing hole 210 is well shielded, thereby further improving the starry sky. Projection effect.

Preferably, the LED light source 10 is coaxially disposed with the corresponding first light passing hole 210 and the second light passing hole 310. Specifically, the LED light source 10, the first light passing hole 210 and the second light passing hole 310 are coaxially arranged, thereby conveniently designing the sizes of the first light passing hole 210 and the second light passing hole 310 and controlling the LED light source 10, The relative positions of the first apertures 20 and the second apertures 30 also facilitate the collection angle of the second apertures 310 to be smaller than the collection angle of the first apertures 210.

In this embodiment, the sub-beams of the plurality of different color beams passing through the beam splitting unit 40 are collimated by the same collimating lens 50, and the plurality of parallel sub-beams after collimation are finally incident on the mirror array 60. , forming a variety of projection patterns of various colors. Of course, the LED light sources 10 of different colors can be turned on or turned on at the same time to form more projection effects to meet different needs. In this embodiment, the mirror array 60 includes a plurality of small mirrors 610. Preferably, each of the small mirrors 610 is square, and the side length is 1-10 mm, and the number of small mirrors 610 is 40. In the above, since each small mirror 610 forms an image on the pattern projection on the pattern sheet, in order to obtain as many projection images as possible, the number of small mirrors 610 is as large as possible. The plurality of small mirrors 610 may be arranged regularly or in a disorderly manner. The reflecting surfaces of all the small mirrors 610 form a common reflecting surface, and the reflecting surface is preferably a curved surface, and the curved surface may be a concave surface or a convex surface. By arranging the small mirror arrays into curved surfaces, the patterns projected by all the small mirrors 610 can be dispersed, and the curvature of the control surface can control the size of the pattern dispersion range. For example, a large mirror can be cut into a 4mm small mirror array and then attached to a curved member to form a curved mirror array. If the splitting unit 40 divides a beam of light into M sub-beams while each sub-beam is incident on the mirror array 60, it covers the N small mirror units in the mirror array 60, so that each beam can finally M*N pattern images are projected, and the patterns are dispersed on each other on the projection surface to form a starry illumination effect. Thus, by the splitting action of the beam splitting unit 40, the number of projection patterns can be greatly increased in the case where the number of small mirrors included in the mirror array 60 is limited.

In summary, the starlight projection lamp provided by the present invention sequentially includes an LED light source 10, a first aperture 20, a beam splitting unit 40, a collimating lens 50, and a mirror array 60 along the optical path, on the first aperture 20 A first light-passing hole 210 corresponding to the LED light source 10 is disposed, and the size of the first light-passing hole 210 is smaller than the size of the LED light source 10. The first light aperture 20 corresponding to the LED light source 10 is disposed on the first aperture 20 for transmitting the light emitted by the LED light source 10, and the size of the first light transmission hole 210 is set. It is smaller than the size of the LED light source 10, thereby reducing the size of the spot, improving the brightness of the spot, and eliminating the need to provide other components such as a focus lens, which greatly reduces the structure and the occupied volume of the lamp. In addition, a second aperture 30 is disposed along the optical path of the first aperture 20, and a second aperture 310 is disposed on the second aperture 30, and the light source is projected to the first light aperture 210 corresponding to the adjacent light source. The incident angle is greater than half of the light collecting angle of the second light passing hole 310 corresponding to the first light passing hole 210, so that the stray light emitted from the first light passing hole 210 is well shielded, thereby further improving the star sky. The projection effect, the starlight projection lamp of the invention realizes the projection effect of a plurality of colors, and the cost is low, and the application is extensive.

Although the embodiments of the present invention have been described in the specification, these embodiments are merely illustrative and are not intended to limit the scope of the invention. Various omissions, substitutions, and changes may be made without departing from the scope of the invention.

Claims

A starlight projection lamp, comprising: an LED light source, a first aperture, a beam splitting unit, a collimating lens and a mirror array in sequence along an optical path, wherein the first aperture is disposed adjacent to an LED light source emitting surface, the first A first light-passing hole corresponding to the light-emitting surface of the LED light source is disposed on a light, and a size of the first light-passing hole is smaller than a size of a light-emitting surface of the LED light source.
The starry sky projection lamp of claim 1 further comprising a bracket for mounting said LED light source and said first aperture, said top of said bracket being above said top of said LED light source, said first The aperture is disposed on the top of the bracket.
The starry sky projection lamp according to claim 1, wherein a distance between the first aperture and the light emitting surface of the LED light source is less than 1 mm.
The starry sky projection lamp according to claim 1, wherein the first aperture is provided with a plurality of spaced patterns.
The starry sky projection lamp according to claim 1, wherein the beam splitting unit is composed of a plurality of mirrors, and the reflecting surfaces of any two of the mirrors are not coplanar.
The starlight projection lamp according to claim 1, wherein the side and the bottom of the LED light source are covered with a silica gel, and the LED light source is fixed in the silica gel.
An LED starlight projection lamp, comprising: an LED light source, a first aperture, a second aperture, a collimating lens and a mirror array arranged in sequence along the optical path, wherein the first aperture is provided with an LED light source a second light-passing hole corresponding to the position of the first light-passing hole, wherein the size of the first light-passing hole is smaller than that of the LED light source The size of the light emitting surface, the collecting angle of the light passing through the second light passing hole is smaller than the collecting angle of the light in the first light passing hole.
The starlight projection lamp according to claim 7, further comprising a bracket, wherein the LED light source, the first aperture, and the second aperture are sequentially disposed on the bracket.
The starry sky projection lamp according to claim 7, wherein the LED light source comprises at least two LED units arranged in a gap and having different light-emitting colors.
The starlight projection lamp according to claim 9, wherein the first aperture comprises at least two first light-passing holes, and the position of the first light-passing hole and the LED unit in the LED light source One-to-one correspondence.
The starry sky projection lamp according to claim 9, wherein an opaque layer is disposed between two adjacent of said LED units.
A starry sky projection lamp according to claim 7, further comprising a beam splitting unit located in front of said collimating lens along an optical path, said beam splitting unit being composed of a plurality of mirrors, and any two mirrors The reflective surfaces are not coplanar.
The starry sky projection lamp according to claim 7, wherein a distance between the first aperture and the light emitting surface of the LED light source is less than 1 mm.
The starry sky projection lamp of claim 7 further comprising a drive mechanism coupled to said array of mirrors for causing said mirror array to rotate.