A single-surface grating based on collimated light imaging starlight field

Abstract

The utility model discloses a single -sided grating based on collimating light imaging starry sky light field, including main shell, insulating gasket, drive circuit board, laser diode, grating main part, install apron and protective glass, the bottom outer wall of main shell is seted up to have the connecting groove, is seted up to have outer thread on the outer wall of connecting groove, is provided with the bottom end cover on connecting groove, is seted up to have inner thread on the inner wall of bottom end cover, the bottom outer surface of bottom end cover is seted up to have annular groove, is provided with antiskid ring pad in annular groove, the utility model discloses having the structural design, the double -layer nested type casing structure of the device outer layer protection casing, the inner layer function carrier, the outer layer protection casing is through the screw thread and is combined elastic sealing washer with screwing seal structure, effectively insulates the erosion of outside pollutant to internal optical element, and the inner layer function carrier is through the accurate structure tolerance design, will insulating isolation gasket, drive circuit board, high thermal conductivity metal base plate, semiconductor laser diode.

Description

Technical Field

[0001] This utility model relates to the field of collimated light imaging technology, and in particular to a single-sided grating based on collimated light imaging of star field. Background Technology

[0002] With the upgrading of consumption and the diversification of decorative lighting scenarios, starry sky lights and ambient lights have seen a continuous increase in market demand in home decoration, children's rooms, commercial showrooms and other fields because they can create a warm and dreamy spatial atmosphere. However, the current technical solutions for starry sky light field imaging in the industry still have defects. First, the existing solutions have structural redundancy and energy consumption imbalance, making it difficult to adapt to miniaturized decorative lighting scenarios. In the current starry sky light field imaging technology, the multi-source array solution needs to construct a light point matrix through distributed LED or semiconductor laser light sources. The supporting independent drive modules and mechanical brackets result in high system structural redundancy, and the size usually exceeds Φ50mm×80mm, which cannot meet the installation requirements of embedded and portable decorative lighting products. At the same time, the energy consumption is generally higher than 5W when multiple light sources work in parallel, which is contrary to the low power consumption requirements of consumer products. Traditional refractive optical systems rely on multiple sets of glass lenses and mirrors to achieve beam splitting and imaging. This not only increases assembly complexity due to the large number of components, but also limits their application in small starry sky lights and ambient lights due to the high processing cost and large size of glass. In addition, although physical mask projection schemes have a relatively simple structure, metal or resin masks are prone to pattern wear due to long-term light exposure and mechanical friction, requiring frequent disassembly and replacement, resulting in high maintenance costs. Secondly, the lack of optical performance stability and compatibility with mass production restricts the expansion of industry applications. Existing technologies generally have defects in optical positioning accuracy. Multi-source array schemes are difficult to control the phase difference between light sources, which easily leads to uneven distribution of star points. The coaxiality deviation of lens groups in traditional refractive optical systems often exceeds 0.5 mm, resulting in blurred edges and significant ghosting of starry sky light fields. At the same time, the ability to suppress stray light is weak. When external dust, water vapor, or component surface contamination occurs, the proportion of stray light can rise to more than 15%, seriously affecting the visual effect. At the mass production level, traditional solutions rely on precision grinding processes for core optical components, which have long processing cycles and high costs, and do not match the market demand for low-cost and high-volume decorative lighting products. Meanwhile, some grating components that use nanoimprinting processes lack standardized assembly structures and rely on irreversible fixing methods such as UV adhesives, making subsequent maintenance and pattern replacement difficult, further reducing their potential for large-scale application. Utility Model Content

[0003] The purpose of this invention is to provide a single-sided grating based on collimated light imaging of the starry sky light field, so as to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a single-sided grating based on collimated light imaging star field, including a main shell, a connecting groove is formed on the bottom outer wall of the main shell, an external thread is formed on the outer wall of the connecting groove, a bottom end cover is provided on the connecting groove, an internal thread is formed on the inner wall of the bottom end cover, an annular groove is formed on the bottom outer surface of the bottom end cover, an anti-slip ring pad is provided in the annular groove, a cavity is formed inside the main shell, and an inner shell is provided inside the cavity.

[0005] As a further technical solution of this utility model, an insulating gasket is provided on the bottom inner wall of the inner shell, a driving circuit board is provided on the upper surface of the insulating gasket, a heat-conducting plate is provided above the driving circuit board, and a mounting plate is provided above the heat-conducting plate.

[0006] As a further technical solution of this utility model, a first through hole and a third through hole are respectively opened at the center of the heat-conducting plate and the mounting plate. A laser diode is disposed in the first through hole, and the top end of the laser diode passes through the third through hole.

[0007] As a further technical solution of this utility model, an upper thermally conductive silicone pad is provided between the heat-conducting plate and the mounting plate, and a lower thermally conductive silicone pad is provided on the bottom outer surface of the heat-conducting plate. A second through hole is provided at the center of both the upper and lower thermally conductive silicone pads. A mounting groove is provided at the center of the upper surface of the mounting plate, and a collimating lens is provided in the mounting groove.

[0008] As a further technical solution of this utility model, a stepped groove is provided on the inner wall of the inner shell, an installation positioning ring is provided on the stepped groove, a first through hole is provided at the center of the installation positioning ring, and a first groove is provided around the first through hole.

[0009] As a further technical solution of this utility model, a grating body is provided in the first through hole, an embossed layer is provided at the bottom of the grating body, a locking block is provided on the upper surface of the mounting positioning ring, a mounting cover plate is provided above the mounting positioning ring, and a locking groove is provided on the mounting cover plate at the position corresponding to the locking block.

[0010] As a further technical solution of this utility model, a second through hole is provided at the center of the mounting cover plate, a second groove is provided on the outside of the second through hole, and a protective glass is provided inside the second through hole.

[0011] Compared with the prior art, the beneficial effects achieved by this utility model are as follows: This utility model adopts a structured design, with a double-layer nested shell structure consisting of an outer protective shell and an inner functional carrier. The outer protective shell achieves IP54 dust and water protection through a threaded sealing structure and an elastic sealing gasket, effectively isolating external pollutants from corroding the internal optical components. The inner functional carrier, through precise structural tolerance design, compactly integrates an insulating gasket, a driving circuit board, a high thermal conductivity metal substrate, a semiconductor laser diode, and a miniature collimating lens, with the overall size controlled within Φ25 to 30 mm × 35 to 40 mm, meeting the installation requirements of miniaturized decorative lighting products. Simultaneously, the multi-level heat conduction path constructed by the high thermal conductivity metal substrate and the double-layer thermally conductive silicone pads can stabilize the operating temperature of the semiconductor laser diode. The temperature is controlled below 45℃ to avoid optical power attenuation caused by high temperature, ensuring stable operation of the device under rated operating current, and adapting to USB portable power supply scenarios. The device achieves coaxiality tolerance control of ≤0.1mm for the single-sided relief diffraction grating, micro-collimating lens and semiconductor laser diode through interference fit between precision optical positioning ring and shell stepped groove, ensuring that the collimated beam is perpendicular to the relief surface of the grating, effectively avoiding star-point ghosting caused by optical path offset. The optical-grade protection window is fixed by a quick-release buckle connection mechanism, which not only achieves physical protection of the diffraction grating, but also significantly improves the clarity of the light field. In addition, the quick-release buckle connection mechanism supports non-destructive disassembly and assembly of the diffraction grating, solving the maintenance problem of traditional UV glue fixing solution. The diffraction grating is made by nanoimprinting process and the collimating lens is made by injection molding process, which has high compatibility with mass production equipment. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0014] Figure 2 This is an exploded view of the structure of this utility model;

[0015] Figure 3 This is an exploded view of the structure of this utility model from below;

[0016] Figure 4 This is a cross-sectional view of the inner shell of this utility model;

[0017] Figure 5 This is an exploded cross-sectional view of the inner shell of this utility model.

[0018] Figure 6 This is an exploded view of the inner shell of this utility model from a bottom sectional section.

[0019] Figure 7 This is a frontal sectional view of the grating body of this utility model.

[0020] In the diagram: 1. Main outer shell; 2. Connecting groove; 3. External thread; 4. Bottom cover; 5. Internal thread; 6. Annular groove; 7. Anti-slip ring pad; 8. Cavity; 9. Inner shell; 10. Insulating gasket; 11. Drive circuit board; 12. Heat-conducting plate; 13. First through hole; 14. Laser diode; 15. Upper thermally conductive silicone pad; 16. Lower thermally conductive silicone pad; 17. Second through hole; 18. Mounting plate; 19. Third through hole; 20. Mounting groove; 21. Collimating lens; 22. Step groove; 23. Mounting positioning ring; 24. First through hole; 25. First groove; 26. Grating body; 27. Embossed layer; 28. Locking block; 29. ​​Mounting cover plate; 30. Locking slot; 31. Second through hole; 32. Second groove; 33. Protective glass. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] Please see the appendix Figure 1 -Appendix Figure 7This utility model provides an embodiment of a single-sided grating based on collimated light imaging of a star field, comprising a main shell 1, a connecting groove 2 on the bottom outer wall of the main shell 1, an external thread 3 on the outer wall of the connecting groove 2, a bottom end cap 4 on the connecting groove 2, an internal thread 5 on the inner wall of the bottom end cap 4, an annular groove 6 on the bottom outer surface of the bottom end cap 4, an anti-slip ring pad 7 inside the annular groove 6, a cavity 8 inside the main shell 1, an inner shell 9 inside the cavity 8; an insulating gasket 10 on the bottom inner wall of the inner shell 9, a driving circuit board 11 on the upper surface of the insulating gasket 10, a heat-conducting plate 12 above the driving circuit board 11, and a mounting plate 18 above the heat-conducting plate 12. 2. Both the heat-conducting plate 12 and the mounting plate 18 are adapted to be fixed to the inner wall of the inner shell 9, with a compact structure and no redundant space, meeting the miniaturization requirements of the starry sky lamp; a first through hole 13 and a third through hole 19 are respectively opened at the center of the heat-conducting plate 12 and the mounting plate 18. A laser diode 14 is installed in the first through hole 13, and the top of the laser diode 14 passes through the third through hole 19. The laser diode 14 is firmly limited by the first through hole 13, and the optical path is aligned with the subsequent collimation structure to ensure low-energy light emission stability; an upper thermally conductive silicone pad 15 is provided between the heat-conducting plate 12 and the mounting plate 18, and a lower thermally conductive silicone pad 16 is provided on the bottom outer surface of the heat-conducting plate 12. A second through hole is opened at the center of both the upper thermally conductive silicone pad 15 and the lower thermally conductive silicone pad 16. A mounting groove 20 is formed at the center of the upper surface of the mounting plate 18 through the perforation 17, and a collimating lens 21 is installed inside the mounting groove 20. A thermally conductive silicone pad is fitted onto the laser diode 14 through the second through hole 17 to assist in heat dissipation and reduce energy consumption. The collimating lens 21 fits into the mounting groove 20 to ensure beam collimation, laying the foundation for a uniform star field. A stepped groove 22 is provided on the inner wall of the inner shell 9, and a mounting positioning ring 23 is provided on the stepped groove 22. A first through hole 24 is formed at the center of the mounting positioning ring 23, and a first groove 25 is provided around the first through hole 24. The mounting positioning ring 23 and the stepped groove 22 are fitted and engaged to ensure the coaxiality of the grating installation and avoid optical path misalignment from affecting the uniformity of the star field. A laser diode 14 is installed inside the first through hole 24. The grating body 26 has an embossed layer 27 at its bottom. A locking block 28 is provided on the upper surface of the mounting positioning ring 23. A mounting cover plate 29 is provided above the mounting positioning ring 23. A slot 30 is provided on the mounting cover plate 29 at the position corresponding to the locking block 28. The mounting cover plate 29 is fastened to the locking block 28 through the slot 30, making it easy to install and remove and convenient to replace the grating body 26 to adapt to different ambient lighting scenes. A second through hole 31 is provided at the center of the mounting cover plate 29. A second groove 32 is provided on the outside of the second through hole 31. A protective glass 33 is provided in the second through hole 31. The edge of the protective glass 33 is embedded in the second groove 32 and secured, which can isolate dust and reduce stray light, ensuring a clear starry sky light field and meeting the needs of decorative lighting.

[0023] Working Principle: Using this invention, an outer protective layer is first constructed by the threaded connection between the main outer shell 1 and the bottom cover 4. The connecting groove 2 on the bottom outer wall of the main outer shell 1 is machined with external threads 3, which engage with the internal threads 5 on the inner wall of the bottom cover 4 to form a sealed cavity. An anti-slip ring pad 7 is embedded in the annular groove 6 on the bottom outer surface of the bottom cover 4, enhancing the anti-slip performance during gripping and preventing external dust and moisture from entering the cavity 8 inside the main outer shell 1, providing clean protection for the internal components. The inner shell 9 nested within the cavity 8 serves as the core functional carrier, integrating and housing the drive and optical components through precise structural tolerances, ensuring the overall size is suitable for small decorative lamps and laying a structural foundation for stable operation. External power is connected to the interior through the assembly gap between the main outer shell 1 and the bottom cover 4. Subsequently, the current is first transmitted to the drive circuit board 11 on the bottom inner wall of the inner shell 9. The insulating pad 10 at the bottom of the drive circuit board 11 can isolate the metal contact between the drive circuit board 11 and the inner shell 9, avoid short circuits, and ensure that the drive circuit board 11 stably outputs the rated current required by the laser diode 14. At the same time, the heat generated by the drive circuit board 11 during operation is conducted to the heat-conducting plate 12 through the lower thermally conductive silicone pad 16 above it. The heat-conducting plate 12 is made of a metal material with a high thermal conductivity, and then the heat is evenly diffused to the inner wall of the inner shell 9 through the heat-conducting plate 12, and finally dissipated outward through the main shell 1. This multi-stage heat dissipation path can control the operating temperature of the drive circuit board 11 and subsequent laser components below 45°C, avoid performance degradation caused by high temperature, and ensure stable low-energy operation of the system. To meet the core requirement of low energy consumption, the current output from the drive circuit board 11 is transmitted through the circuit connection to the laser diode 14 installed in the first through hole 13 in the center of the heat-conducting plate 12. After being powered on, the laser diode 14 emits an initial laser beam. The top of the laser diode 14 passes through the third through hole 19 in the center of the mounting plate 18. The upper thermally conductive silicone pad 15 between the heat-conducting plate 12 and the mounting plate 18 has a second through hole 17 in the center for the laser beam to pass through, which can conduct some of the heat from the laser diode 14 to the mounting plate 18 to assist in heat dissipation. A collimating lens 21 is fixed in the mounting groove 20 in the center of the upper surface of the mounting plate 18. The initial diverging laser beam emitted by the laser diode 14 is refracted by the collimating lens 21 and converted into a collimated beam with a parallelism of less than or equal to 0.5 degrees. Providing incident light that meets the Fraunhofer diffraction conditions for subsequent grating diffraction is a crucial prerequisite for generating a uniform starlight field. The collimated beam continues to propagate forward and enters the mounting positioning ring 23 fixed on the stepped groove 22 of the inner wall of the inner shell 9. The grating body 26 is installed in the first through hole 24 at the center of the mounting positioning ring 23. The first groove 25 around the first through hole 24 can assist in venting during assembly, ensuring that the grating body 26 fits tightly with the mounting positioning ring 23 without any gaps causing optical path deviation. The bottom of the grating body 26 is processed with an embossed layer 27, a single-sided microscopic sinusoidal diffraction structure. When the collimated beam is perpendicularly incident on the embossed layer 27, based on the Fraunhofer diffraction principle, the wavefront of the beam is modulated by the periodic structure of the embossed layer 27 and decomposed into multiple diffracted beams with specific phase differences.These diffracted lights interfere and superimpose in space, forming a uniformly distributed star pattern. The generated starlight field continues to propagate forward, passing through the mounting cover 29 above the mounting positioning ring 23. The mounting cover 29 is connected to the locking block 28 on the upper surface of the mounting positioning ring 23 via its slot 30, achieving both stable positioning of the grating body 26 and non-destructive disassembly and assembly. A protective glass 33 is fixed in the second through hole 31 at the center of the mounting cover 29. The second groove 32 on the outer side of the second through hole 31 helps to fix the edge of the protective glass 33. The protective glass 33 can isolate external dust and fingerprints from contaminating the embossed layer 27 of the grating body 26, while suppressing stray light. Finally, the starlight field is stably projected into the space in front of the main shell 1, forming a clear and uniform starlight visual effect.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A single-sided grating based on collimated light imaging of star field, comprising a main shell (1), characterized in that: The main outer shell (1) has a connecting groove (2) on its bottom outer wall, an external thread (3) on its outer wall, a bottom end cap (4) on its connecting groove (2), an internal thread (5) on its inner wall, an annular groove (6) on its bottom outer surface, an anti-slip ring pad (7) in its annular groove (6), a cavity (8) inside its main outer shell (1), and an inner shell (9) inside its cavity (8).

2. A single-sided grating based on collimated light imaging of a starry sky light field according to claim 1, characterized in that: An insulating pad (10) is provided on the bottom inner wall of the inner shell (9). A driving circuit board (11) is provided on the upper surface of the insulating pad (10). A heat-conducting plate (12) is provided above the driving circuit board (11), and an mounting plate (18) is provided above the heat-conducting plate (12).

3. A single-sided grating based on collimated light imaging of a starry sky light field according to claim 2, characterized in that: The heat-conducting plate (12) and the mounting plate (18) are respectively provided with a first through hole (13) and a third through hole (19). A laser diode (14) is provided in the first through hole (13), and the top end of the laser diode (14) passes through the third through hole (19).

4. A single-sided grating based on collimated light imaging of a starry sky light field according to claim 3, characterized in that: An upper thermally conductive silicone pad (15) is provided between the heat-conducting plate (12) and the mounting plate (18). A lower thermally conductive silicone pad (16) is provided on the bottom outer surface of the heat-conducting plate (12). A second through hole (17) is provided at the center of both the upper thermally conductive silicone pad (15) and the lower thermally conductive silicone pad (16). A mounting groove (20) is provided at the center of the upper surface of the mounting plate (18). A collimating lens (21) is provided in the mounting groove (20).

5. A single-sided grating based on collimated light imaging of a starry sky light field according to claim 2, characterized in that: The inner wall of the inner shell (9) is provided with a stepped groove (22), and a mounting positioning ring (23) is provided on the stepped groove (22). A first through hole (24) is opened at the center of the mounting positioning ring (23), and a first groove (25) is provided around the first through hole (24).

6. A single-sided grating based on collimated light imaging of a starry sky light field according to claim 5, characterized in that: A grating body (26) is provided inside the first through hole (24). An embossed layer (27) is provided at the bottom of the grating body (26). A locking block (28) is provided on the upper surface of the mounting positioning ring (23). A mounting cover plate (29) is provided above the mounting positioning ring (23). A slot (30) is provided on the mounting cover plate (29) at the position corresponding to the locking block (28).

7. A single-sided grating based on collimated light imaging of a starry sky light field according to claim 6, characterized in that: A second through hole (31) is provided at the center of the mounting cover plate (29), a second groove (32) is provided on the outside of the second through hole (31), and a protective glass (33) is provided inside the second through hole (31).

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