Four-point square diffractive optical element with bottom stray light scattering function

Abstract

The invention relates to the technical field of diffractive optical elements, and discloses a four-point square diffractive optical element with a bottom stray light scattering function, the four-point square diffractive optical element comprises a laser head body and a four-point square diffractive optical element body, the surface of the laser head body is provided with a control panel, and the surface of the laser head body is in threaded connection with a head cover; the four-point square diffraction optical element body is arranged in the head cover, and by arranging the auxiliary device, when the four-point square diffraction optical element body is installed, after the head cover and the laser head body are installed, the pressing assembly can press the outer ring base, positioning is achieved, and damage to the optical element is reduced; the outer ring base is matched with the inner heat conduction ring to separate the four-point square diffractive optical element body from the head cover, meanwhile, the inner heat conduction ring can conduct heat on the four-point square diffractive optical element body, the head cover through hole, the protruding block penetrating hole and the flowing space form a through airflow path, external air can directly make contact with the inner heat conduction ring and take away heat, and effective heat dissipation is achieved.

Description

Technical Field

[0001] This invention relates to the field of diffractive optical element technology, specifically a four-point square diffractive optical element with bottom stray light scattering function. Background Technology

[0002] Diffractive optical elements (DOEs) are novel optical devices based on the principle of light diffraction. They are created by fabricating nano- to micro-scale precision microstructures (such as gratings, phase steps, and holographic patterns) on a substrate (such as glass, fused silica, or polymers). These structures allow for flexible control of the amplitude, phase, polarization, or wavelength of the light field. Unlike traditional refractive optical elements (such as lenses and prisms) that rely on changes in the refractive index of materials to control light, DOEs utilize the wave nature of light. Through the periodic or non-periodic distribution of microstructures, light from different locations interferes, diffracts, and then superimposes, thereby achieving complex functions such as beam splitting, beam focusing, beam shaping, and beam deflection.

[0003] Its core advantages lie in its high integration (multiple optical functions can be integrated into a single piece), small size, light weight, and ability to achieve special light field manipulation that is difficult to achieve with traditional components (such as generating flat-top light spots and array light spots). It is widely used in laser processing, lidar, biomedicine, AR / VR, optical communication and other fields, and is one of the key core components of modern precision optical systems.

[0004] Existing lasers typically incorporate a four-point square diffraction optical element. During installation, this element is held in place by a spring. The continuous pressure from the spring creates static stress concentration, particularly at the edges or corners (non-working areas) of the square structure. This localized excessive stress can easily lead to micro-cracks. Furthermore, the square diffraction optical element is in direct contact with the laser after installation and is located in a confined space, making heat dissipation difficult. Heat from the laser can also be directly transferred to the square diffraction optical element, causing it to overheat and affecting its lifespan and usability.

[0005] To address this, we propose a four-point square diffraction optical element with bottom stray light dispersion function. Summary of the Invention

[0006] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a four-point square diffraction optical element with bottom stray light dispersion function, which solves the problems of existing spring-loaded mounting, which easily damages the four-point square diffraction optical element and is not conducive to heat dissipation.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: a four-point square diffraction optical element with bottom stray light dispersion function, comprising a laser head body and a four-point square diffraction optical element body, wherein a control plate is mounted on the surface of the laser head body, a head cover is threadedly connected to the surface of the laser head body, the four-point square diffraction optical element body is disposed inside the head cover, and an auxiliary device is provided on the surface of the four-point square diffraction optical element body. The auxiliary device includes an inner heat-conducting ring fixed to the outer surface of the four-point square diffractive optical element. An outer ring seat is provided on the outer side of the inner heat-conducting ring. A flexible connecting component is provided between the inner heat-conducting ring and the outer ring seat to form a flow space between them. Multiple protrusions are fixedly connected to the surface of the outer ring seat. Multiple guide grooves are opened on the inner wall of the head cover. The protrusions are inserted into the inner wall of the guide grooves. Through holes are opened on the surface of the protrusions and are connected to the flow space. Multiple through holes are opened on the surface of the head cover, and the multiple through holes correspond one-to-one with the multiple through holes. A pressing component is also provided on the surface of the outer ring seat. After the head cover is connected to the laser head body, the outer ring seat can be pressed tightly.

[0008] Preferably, the clamping assembly includes multiple hollow sleeves fixed to the surface of the outer ring seat. A sliding rod is slidably connected to the inner wall of each hollow sleeve. A spring is fixedly connected to the side of the sliding rod corresponding to the inner wall of the hollow sleeve. An annular portion is fixedly connected to the upper end of each sliding rod. Through the above components, when the head cover is connected to the laser head body, one end of the laser head body can be pressed against the annular portion, so that the outer ring seat abuts against the inner wall of the head cover. Then the sliding rod moves in the hollow sleeve, and the spring is stressed, thereby stably clamping the outer ring seat. When the head cover is removed, the spring drives the sliding rod and the annular portion to move, and the annular portion extends out of the head cover for easy removal.

[0009] Preferably, the annular portion includes a fixed ring fixed to the upper end of the slide rod, and a rotating ring is rotatably connected to the inner wall of the fixed ring. Through the above components, when the annular portion contacts the laser head body, it contacts the laser head body through the rotating ring. When the head cover is rotated, the rotating ring can rotate within the fixed ring, thereby reducing the friction between the two sets of components.

[0010] Preferably, a gasket is fixedly connected to the side surface of the protrusion near the guide groove. The gasket is made of rubber. Through the above-mentioned components, the rubber gasket can fill the gap between the protrusion and the guide groove, thereby allowing air to enter the flow space better from the through hole and the perforation in sequence.

[0011] Preferably, the flexible connection assembly includes rubber rings fixed to the upper and lower surfaces of the inner heat-conducting ring, with the other end of the rubber rings fixedly connected to the surface of the outer ring seat. A plurality of rubber pillars are fixedly connected to the outer surface of the inner heat-conducting ring, with the other end of the plurality of rubber pillars fixedly connected to the inner wall of the outer ring seat. Through the above components, the inner heat-conducting ring and the outer ring seat are connected by the rubber pillars and rubber rings, thereby reducing the rigid connection between the four-point square diffraction optical element bodies and effectively protecting the four-point square diffraction optical element bodies.

[0012] Preferably, multiple sets of heat-conducting sheets are fixedly connected to the outer surface of the inner heat-conducting ring, with two sheets in each set. The multiple sets of heat-conducting sheets are inserted into the perforation. Through the above-mentioned components, the heat of the inner heat-conducting ring can be further conducted through the heat-conducting sheets, while increasing the contact area with the air.

[0013] Preferably, the heat-conducting sheet is rectangular in shape, and the surface of the heat-conducting sheet has multiple concave grooves. Through the above-mentioned components, the multiple concave grooves on the surface of the heat-conducting sheet can further increase the contact area between the heat-conducting sheet and the air.

[0014] Preferably, both the heat-conducting sheet and the inner heat-conducting ring are made of copper.

[0015] Preferably, an extension cylinder is fixedly connected to the upper surface of the outer ring seat.

[0016] Preferably, the rubber column and rubber ring are made of fluororubber.

[0017] In summary, the technical effects and advantages of this invention are as follows: 1. In this invention, by setting an auxiliary device, when the four-point square diffractive optical element body is installed, after the head cover and laser head body are installed, the clamping component can press the outer ring seat to achieve positioning and reduce damage to the optical element. The outer ring seat, together with the inner heat-conducting ring, separates the four-point square diffractive optical element body from the head cover. At the same time, the inner heat-conducting ring can conduct heat to the four-point square diffractive optical element body. The through holes of the head cover, the protrusion perforations and the flow space form a through airflow path, and the outside air can directly contact the inner heat-conducting ring and carry away the heat, thereby achieving effective heat dissipation.

[0018] 2. In this invention, by setting up a flexible connection component, the inner heat-conducting ring and the outer ring seat are connected by rubber pillars and rubber rings made of fluororubber material. This allows the four-point square diffraction optical element body and the inner heat-conducting ring to be flexibly connected to the outer ring seat, which can absorb the impact force generated by the vibration of the laser head body and achieve a protective effect.

[0019] 3. In this invention, when the head cover is removed, the laser head loses its pressure on the rotating ring and the fixed ring. At this time, the spring releases its elastic force, causing the slide rod, the fixed ring and the rotating ring to reset. The fixed ring and the rotating ring extend out of the head cover. By taking the fixed ring and the rotating ring, the outer ring seat can be removed for easy handling.

[0020] 4. In this invention, a rubber gasket is fixedly connected to the surface of the protrusion, which can fill the gap between the protrusion and the guide groove, thereby allowing air to enter the flow space better from the through hole and the perforation in sequence, thus improving the sealing effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a four-point square diffraction optical element with bottom stray light dispersion function according to the present invention; Figure 2 This is an exploded view of the structure of a four-point square diffraction optical element with bottom stray light scattering function according to the present invention. Figure 3 This is a schematic cross-sectional view of the headgear structure of a four-point square diffraction optical element with bottom stray light dispersion function according to the present invention. Figure 4 This is a partial exploded structural diagram of the auxiliary device for a four-point square diffraction optical element with bottom stray light scattering function according to the present invention. Figure 5 This is an exploded view of the pressing assembly of a four-point square diffraction optical element with bottom stray light dispersion function according to the present invention. Figure 6 This is a schematic cross-sectional view of the outer ring seat of a four-point square diffraction optical element with bottom stray light dispersion function according to the present invention. Figure 7 This is a partial structural schematic diagram of an auxiliary device for a four-point square diffraction optical element with bottom stray light dispersion function according to the present invention.

[0022] In the figure: 1. Laser head body; 2. Control board; 3. Head cover; 4. Auxiliary device; 41. Through hole; 42. Outer ring seat; 43. Protrusion; 44. Perforation; 45. Extension tube; 46. Clamping assembly; 461. Hollow sleeve; 462. Slide rod; 463. Fixing ring; 464. Rotating ring; 47. Guide groove; 48. Inner heat-conducting ring; 49. Flexible connection assembly; 491. Rubber ring; 492. Rubber column; 410. Heat-conducting plate; 411. Flow space; 412. Gasket; 5. Four-point square diffraction optical element body. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] refer to Figure 1 - Figure 7 The four-point square diffraction optical element shown includes a laser head body 1 and a four-point square diffraction optical element body 5. A control plate 2 is mounted on the surface of the laser head body 1, and a head cover 3 is threadedly connected to the surface of the laser head body 1. The four-point square diffraction optical element body 5 is disposed inside the head cover 3, and an auxiliary device 4 is provided on the surface of the four-point square diffraction optical element body 5.

[0025] In this invention, the laser head body 1 has a laser wavelength of 650nm, a laser power of 5nW, a laser output aperture of 2.5nm, a laser spot size of 2nm at the focal point, and a four-point square diffraction optical element body 5 with a light field divergence angle. At a working distance of 20mm, the graphic size is 10mm x 10mm including the dot size. When the size of the light source dot size changes, the graphic size will also change to a certain extent. The dimensional tolerance is ±5%, the light intensity efficiency is greater than 50%, and it has bottom stray light dispersion. The PET refractive index is 1.527, the UV adhesive shrinkage rate is 2.8%, the material is glass, and the thickness is 0.25mm.

[0026] The auxiliary device 4 includes an inner heat-conducting ring 48 fixed on the outer surface of the four-point square diffraction optical element body 5. An outer ring seat 42 is provided on the outer side of the inner heat-conducting ring 48. A flexible connecting component 49 is provided between the inner heat-conducting ring 48 and the outer ring seat 42, so that a flow space 411 is formed between the inner heat-conducting ring 48 and the outer ring seat 42. Multiple protrusions 43 are fixedly connected to the surface of the outer ring seat 42. Multiple guide grooves 47 are opened on the inner wall of the head cover 3. The protrusions 43 are inserted into the inner wall of the guide grooves 47. Through holes 44 are opened on the surface of the protrusions 43, and the through holes 44 are connected to the flow space 411. Multiple through holes 41 are opened on the surface of the head cover 3, and the multiple through holes 41 correspond one-to-one with the multiple through holes 44. A pressing component 46 is also provided on the surface of the outer ring seat 42. After the head cover 3 is connected to the laser head body 1, the outer ring seat 42 can be pressed. An extension tube 45 is fixedly connected to the upper surface of the outer ring seat 42.

[0027] In this embodiment, by setting the auxiliary device 4, when the four-point square diffractive optical element body 5 is installed, after the head cover 3 and the laser head body 1 are installed, the clamping component 46 can clamp the outer ring seat 42 to achieve positioning and reduce damage to the optical element. The outer ring seat 42, together with the inner heat-conducting ring 48, separates the four-point square diffractive optical element body 5 from the head cover 3. At the same time, the inner heat-conducting ring 48 can conduct heat to the four-point square diffractive optical element body 5. The through hole 41, the protrusion 43 through hole 44 and the flow space 411 form a through airflow path, and the external air can directly contact the inner heat-conducting ring 48 and carry away the heat to achieve effective heat dissipation.

[0028] The clamping assembly 46 includes a plurality of hollow sleeves 461 fixed on the surface of the outer ring seat 42. A slide rod 462 is slidably connected to the inner wall of the hollow sleeve 461. A spring is fixedly connected to the side of the slide rod 462 corresponding to the inner wall of the hollow sleeve 461. An annular portion is fixedly connected to the upper end of the plurality of slide rods 462.

[0029] In this embodiment: when the head cover 3 is connected to the laser head body 1, one end of the laser head body 1 can be pressed against the annular part, so that the outer ring seat 42 abuts against the inner wall of the head cover 3. Then the slide rod 462 moves in the hollow sleeve 461, and the spring is stressed, so that the outer ring seat 42 can be stably pressed. When the head cover 3 is removed, the spring drives the slide rod 462 and the annular part to move, and the annular part extends out of the head cover 3 for easy removal.

[0030] The annular part includes a fixed ring 463 fixed to the upper end of the slide rod 462, and a rotating ring 464 is rotatably connected to the inner wall of the fixed ring 463.

[0031] In this embodiment: when the annular part contacts the laser head body 1, the rotating ring 464 contacts the laser head body 1, and when the head cover 3 is rotated, the rotating ring 464 can rotate within the fixed ring 463, thereby reducing the friction between the two sets.

[0032] Among them, a gasket 412 is fixedly connected to the side surface of the protrusion 43 near the guide groove 47. The gasket 412 is made of rubber. The rubber gasket 412 can fill the gap between the protrusion 43 and the guide groove 47, so that air can better enter the flow space 411 from the through hole 41 and the perforation 44 in sequence.

[0033] The flexible connection component 49 includes a rubber ring 491 fixed on the upper and lower surfaces of the inner heat-conducting ring 48. The other end of the rubber ring 491 is fixedly connected to the surface of the outer ring seat 42. A plurality of rubber pillars 492 are fixedly connected to the outer ring surface of the inner heat-conducting ring 48. The other end of the plurality of rubber pillars 492 is fixedly connected to the inner wall of the outer ring seat 42. The rubber pillars 492 and the rubber ring are made of fluororubber.

[0034] In this embodiment, the inner heat-conducting ring 48 and the outer ring seat 42 are connected by rubber pillar 492 and rubber ring 491, thereby reducing the rigid connection between the four-point square diffraction optical element bodies 5 and effectively protecting the four-point square diffraction optical element bodies 5.

[0035] Among them, multiple sets of heat-conducting plates 410 are fixedly connected to the outer ring surface of the inner heat-conducting ring 48. Each set of heat-conducting plates 410 has two pieces. The multiple sets of heat-conducting plates 410 are inserted into the through hole 44. Both the heat-conducting plates 410 and the inner heat-conducting ring 48 are made of copper. The heat-conducting plates 410 are rectangular in shape, and multiple concave grooves are opened on the surface of the heat-conducting plates 410.

[0036] In this embodiment: the heat of the inner heat-conducting ring 48 can be further conducted through the heat-conducting plate 410, while increasing the contact area with air. The multiple concave grooves opened on the surface of the heat-conducting plate 410 can further increase the contact area between the heat-conducting plate 410 and air.

[0037] Working principle of this invention: During use, when installation is required, first insert the outer ring seat 42 into the head cover 3. The protrusion 43 on the surface of the outer ring seat 42 is inserted into the guide groove 47 for guidance. When the outer ring seat 42 abuts against the inner wall of the head cover 3, the insertion is complete. Then, connect the head cover 3 to the laser head body 1. The laser head body 1 contacts and abuts against the rotating ring 464 in the annular part, and the head cover 3 is rotated for connection. The laser head body 1 presses against the rotating ring 464, the fixed ring 463, and the slide rod 462. The slide rod 462 moves in the hollow sleeve 461, and the spring is stressed. When the head cover 3 is fully connected, the spring force can press the outer ring seat 42 tightly to ensure the stability after installation. After installation, when the four-point square diffraction optical element body 5 heats up... When the inner heat-conducting ring 48 conducts heat, multiple sets of heat-conducting plates 410 work together to conduct heat. The through holes 41 on the surface of the head cover 3 are aligned with the perforations 44 on the surface of the protrusion 43. Outside air can enter the flow space 411 through the through holes 41 and perforations 44 and come into contact with the inner heat-conducting ring 48 and heat-conducting plates 410, carrying away heat and dissipating it through other through holes 41 and perforations 44, thus achieving a heat dissipation effect. When it needs to be removed later, simply separate the head cover 3 from the laser head body 1. The laser head body 1 loses its pressure on the rotating ring 464. Then, the spring drives the slide rod 462, the fixed ring 463 and the rotating ring 464 to move. The fixed ring 463 and the rotating ring 464 extend out of the head cover 3 and can be removed, thereby taking out the outer ring seat 42. When the laser head body 1 is subjected to vibration, the inner heat-conducting ring 48 and the outer ring seat 42 are connected by the rubber pillar 492 and the rubber ring 491, thereby reducing the rigid connection between the four-point square diffraction optical element bodies 5, which can effectively buffer and protect the four-point square diffraction optical element bodies 5.

[0038] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power, and the main controller can be a conventional known device such as a computer that can control it.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A four-point square diffraction optical element with bottom stray light dispersion function, comprising a laser head body (1) and a four-point square diffraction optical element body (5), characterized in that: A control board (2) is mounted on the surface of the laser head body (1), and a head cover (3) is threadedly connected to the surface of the laser head body (1). The four-point square diffraction optical element body (5) is set inside the head cover (3), and an auxiliary device (4) is provided on the surface of the four-point square diffraction optical element body (5). The auxiliary device (4) includes an inner heat-conducting ring (48) fixed to the outer surface of the four-point square diffraction optical element body (5). An outer ring seat (42) is provided on the outer side of the inner heat-conducting ring (48). A flexible connecting component (49) is provided between the inner heat-conducting ring (48) and the outer ring seat (42) to form a flow space (411) between the inner heat-conducting ring (48) and the outer ring seat (42). A plurality of protrusions (43) are fixedly connected to the surface of the outer ring seat (42). A plurality of guides are provided on the inner wall of the head cover (3). The guide groove (47) is inserted into the inner wall of the guide groove (47). The surface of the protrusion (43) is provided with a through hole (44), which is connected to the flow space (411). The surface of the head cover (3) is provided with multiple through holes (41), which correspond one-to-one with the multiple through holes (44). The surface of the outer ring seat (42) is also provided with a pressing component (46). After the head cover (3) is connected to the laser head body (1), the outer ring seat (42) can be pressed.

2. A four-point square diffraction optical element with bottom stray light scattering function according to claim 1, characterized in that: The clamping assembly (46) includes a plurality of hollow sleeves (461) fixed on the surface of the outer ring seat (42). The inner wall of the hollow sleeve (461) is slidably connected to a slide rod (462). A spring is fixedly connected to one side of the slide rod (462) corresponding to the inner wall of the hollow sleeve (461). The upper end of the plurality of slide rods (462) is fixedly connected to an annular portion.

3. A four-point square diffraction optical element with bottom stray light scattering function according to claim 2, characterized in that: The annular portion includes a fixed ring (463) fixed to the upper end of the slide bar (462), and a rotating ring (464) is rotatably connected to the inner wall of the fixed ring (463).

4. A four-point square diffraction optical element with bottom stray light dispersion function according to claim 1, characterized in that: A gasket (412) is fixedly connected to the side surface of the protrusion (43) near the guide groove (47), and the gasket (412) is made of rubber.

5. A four-point square diffraction optical element with bottom stray light scattering function according to claim 1, characterized in that: The flexible connection assembly (49) includes a rubber ring (491) fixed on the upper and lower surfaces of the inner heat-conducting ring (48). The other end of the rubber ring (491) is fixedly connected to the surface of the outer ring seat (42). A plurality of rubber pillars (492) are fixedly connected to the outer ring surface of the inner heat-conducting ring (48). The other end of the plurality of rubber pillars (492) is fixedly connected to the inner wall of the outer ring seat (42).

6. A four-point square diffraction optical element with bottom stray light scattering function according to claim 1, characterized in that: Multiple sets of heat-conducting plates (410) are fixedly connected to the outer ring surface of the inner heat-conducting ring (48). Each set of heat-conducting plates (410) has two pieces, and the multiple sets of heat-conducting plates (410) are inserted into the through hole (44).

7. A four-point square diffraction optical element with bottom stray light scattering function according to claim 6, characterized in that: The heat-conducting sheet (410) is rectangular in shape, and the surface of the heat-conducting sheet (410) has multiple concave grooves.

8. A four-point square diffraction optical element with bottom stray light scattering function according to claim 6, characterized in that: Both the heat-conducting sheet (410) and the inner heat-conducting ring (48) are made of copper.

9. A four-point square diffraction optical element with bottom stray light scattering function according to claim 1, characterized in that: An extension tube (45) is fixedly connected to the upper surface of the outer ring seat (42).

10. A four-point square diffraction optical element with bottom stray light scattering function according to claim 5, characterized in that: The rubber column (492) and rubber ring are made of fluororubber.

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