A pinhole collimator achromatic laser point module

Abstract

The utility model discloses a kind of condensed bundle achromatic laser point module, including optical collimation component and optical achromatic zoom component, realize the diameter reduction change of incident parallel light beam, the original physical intercept requirement output beam size is converted into optical achromatic zoom component modulation requirement beam size, to satisfy the maximum laser power under the safety condition;The dispersion coefficient of the second lens is 64.212, the dispersion coefficient of third lens is 60.614, for the achromatic processing of the beam quality in the range of 500nm to 530nm.

Description

Technical Field

[0001] This utility model belongs to the technical field of laser modules for line projectors, specifically relating to a beam-shrinking achromatic laser dot module. Background Technology

[0002] The existing laser module optical path of the projector mainly consists of a laser diode and a collimating optical module. The main problem with existing modules is that using a small-aperture aperture to capture a circular spot wastes excessive energy. To meet customer-required optical power, the laser diode drive circuit often needs to be over-power modulated. This significantly reduces the lifespan of the laser diode, and the collimating module in existing modules is difficult to adjust again after it is fixed. When using high-precision optical components such as DOE diffractometers and Powell prisms, it is difficult to fully utilize the basic parameter performance of these components, and high-precision optical components have strict requirements on the incident spot size and incident divergence angle.

[0003] Existing modules simply add a small aperture stop at the output port to capture the required light spot, resulting in overpower modulation of the laser diode drive circuit. When using high-requirement optical components, it is difficult to fully utilize the basic performance of the relevant optical components. Therefore, it is necessary to develop a new type of laser module. Utility Model Content

[0004] The purpose of this invention is to solve the problems of the prior art and provide a beam-shrinking achromatic laser dot module.

[0005] To solve the technical problem, the technical solution of this utility model is: a beam-shrinking achromatic laser dot module, including an optical collimation component and an optical achromatic zoom component. The optical collimation component includes a first lens and a second lens, and the optical achromatic zoom component includes a third lens and a fourth lens. The first lens, the second lens, the third lens and the fourth lens are arranged sequentially on the same horizontal optical axis. The distance from the center of the front surface of the first lens to the light-emitting end face of the laser diode is 8.321 mm, the distance from the center of the rear surface of the first lens to the center of the front surface of the second lens is 0.5 mm, the radius of curvature of the front surface of the first lens is -16.168 mm, the radius of curvature of the rear surface of the first lens is -6.632 mm, and the center thickness of the first lens is 2 mm. The radius of curvature of the front surface of the second lens is 84.979 mm, the radius of curvature of the rear surface of the second lens is -13.516 mm, the center thickness of the second lens is 3 mm, and the distance from the center of the rear surface of the second lens to the center of the front surface of the third lens is 5~8 mm. The radius of curvature of the front surface of the third lens is 11.125 mm, the radius of curvature of the rear surface of the third lens is 86.177 mm, the center thickness of the third lens is 3 mm, and the distance from the center of the rear surface of the third lens to the center of the front surface of the third lens is 8.001 ± 0.2 mm. The radius of curvature of the front surface of the fourth lens is -5.479 mm, the radius of curvature of the rear surface of the fourth lens is ∞, and the center thickness of the fourth lens is 2 mm. The second lens has a dispersion coefficient of 64.212, and the third lens has a dispersion coefficient of 60.614. They are used to perform achromatic aberration processing on the beam quality in the range of 500nm to 530nm.

[0006] Preferably, the short-axis divergence angle NA of the laser diode is 0.185.

[0007] Preferably, the front and rear surfaces of the first lens are both standard surfaces, the material of the first lens is H-K9L, the refractive index is 1.51, the dispersion coefficient is 64.212, the diameter of the front surface of the first lens is 4mm, and the diameter of the rear surface of the first lens is 8mm.

[0008] Preferably, the front and rear surfaces of the second lens are both standard surfaces, the material of the second lens is H-K9L, the refractive index is 1.51, the dispersion coefficient is 64.212, and the diameter of the front and rear surfaces of the second lens is 8mm.

[0009] Preferably, the front and rear surfaces of the third lens are both standard surfaces, the material of the third lens is H-ZK7, the refractive index is 1.61, the dispersion coefficient is 60.614, and the diameter of the front and rear surfaces of the third lens is 8mm.

[0010] Preferably, the front and rear surfaces of the fourth lens are both standard surfaces, the material of the fourth lens is H-K9L, the refractive index is 1.51, the dispersion coefficient is 64.212, the diameter of the front surface of the fourth lens is 6mm, and the diameter of the rear surface of the fourth lens is 8mm.

[0011] Compared with the prior art, the advantages of this utility model are: (1) This utility model proposes a beam-shrinking achromatic laser dot module, including an optical collimation component and an optical achromatic zoom component, to realize the reduction and change of the diameter of the incident parallel light beam, and to transform the original physical interception of the required output beam size into the optical achromatic zoom component modulating the required beam size, so as to maximize the laser power under the safety conditions. (2) This utility model has the advantage that the power of the laser diode driving circuit is less than that of the existing module under the same beam size conditions, which maximizes the extension of the life of the laser diode and avoids the potential risks caused by over-power driving of the laser diode under normal use. (3) The dispersion coefficient of the second lens of this utility model is 64.212 and the dispersion coefficient of the third lens is 60.614. They are used to perform achromatic aberration processing on the beam quality in the range of 500nm to 530nm. They have the function of narrowband achromatic aberration and avoid the problem of product accuracy change caused by the center band drift of the laser diode after long-term use. (4) The distance from the center of the rear surface of the third lens 3 to the center of the front surface of the third lens 3 is 8.001±0.2mm, which can be finely adjusted by ±0.2mm to finely adjust the angle of the emitted beam to adapt to the working requirements of high-precision optical components. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a beam-shrinking achromatic laser dot module according to the present invention; Figure 2 This is a schematic diagram of the optical collimation component of this utility model; Figure 3 This is a diagram showing the collimation optical path of the optical collimation component of this utility model. Figure 4 This is a collimated beam-shrinking achromatic laser dot module diagram of the present invention.

[0013] Explanation of reference numerals in the attached figures: 1. First lens, 2. Second lens, 3. Third lens, 4. Fourth lens. Detailed Implementation

[0014] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments, but the present invention is not limited to these embodiments. The present invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of the present invention. To provide the public with a thorough understanding of the present invention, specific details are described in detail in the following embodiments, but those skilled in the art will fully understand the present invention even without these details.

[0015] Example 1 like Figure 1 As shown, this utility model discloses a beam-shrinking achromatic laser dot module, including an optical collimation component and an optical achromatic zoom component. The optical collimation component includes a first lens 1 and a second lens 2, and the optical achromatic zoom component includes a third lens 3 and a fourth lens 4. The first lens 1, the second lens 2, the third lens 3 and the fourth lens 4 are arranged sequentially on the same horizontal optical axis. The distance from the center of the front surface of the first lens 1 to the light-emitting end face of the laser diode is 8.321 mm, the distance from the center of the rear surface of the first lens 1 to the center of the front surface of the second lens 2 is 0.5 mm, the radius of curvature of the front surface of the first lens 1 is -16.168 mm, the radius of curvature of the rear surface of the first lens 1 is -6.632 mm, and the center thickness of the first lens 1 is 2 mm. The radius of curvature of the front surface of the second lens 2 is 84.979 mm, the radius of curvature of the rear surface of the second lens 2 is -13.516 mm, the center thickness of the second lens 2 is 3 mm, and the distance from the center of the rear surface of the second lens 2 to the center of the front surface of the third lens 3 is 5~8 mm. The radius of curvature of the front surface of the third lens 3 is 11.125 mm, the radius of curvature of the rear surface of the third lens 3 is 86.177 mm, the center thickness of the third lens 3 is 3 mm, and the distance from the center of the rear surface of the third lens 3 to the center of the front surface of the third lens 3 is 8.001 ± 0.2 mm. The radius of curvature of the front surface of the fourth lens 4 is -5.479mm, the radius of curvature of the rear surface of the fourth lens 4 is ∞, and the center thickness of the fourth lens 4 is 2mm. The second lens 2 has a dispersion coefficient of 64.212, and the third lens 3 has a dispersion coefficient of 60.614. They are used to perform achromatic aberration processing on the beam quality in the range of 500nm to 530nm.

[0016] Example 2 Preferably, the short-axis divergence angle NA of the laser diode is 0.185.

[0017] Preferably, the front and rear surfaces of the first lens 1 are both standard surfaces, the material of the first lens 1 is H-K9L, the refractive index is 1.51, the dispersion coefficient is 64.212, the diameter of the front surface of the first lens 1 is 4mm, and the diameter of the rear surface of the first lens 1 is 8mm.

[0018] Preferably, the front and rear surfaces of the second lens 2 are both standard surfaces, the material of the second lens 2 is H-K9L, the refractive index is 1.51, the dispersion coefficient is 64.212, and the diameter of the front and rear surfaces of the second lens 2 is 8mm.

[0019] like Figure 2 As shown, the optical collimation assembly includes a first lens 1 and a second lens 2, which collimates the diverging beam into a parallel beam, such as... Figure 3 The diagram shows the collimated optical path points of the optical collimation assembly. The beams collimated by the optical collimation assembly are all within the diffraction-limited ring.

[0020] Example 3 Preferably, the front and rear surfaces of the third lens 3 are both standard surfaces, the material of the third lens 3 is H-ZK7, the refractive index is 1.61, the dispersion coefficient is 60.614, and the diameter of the front and rear surfaces of the third lens 3 is 8mm.

[0021] Preferably, the front and rear surfaces of the fourth lens 4 are both standard surfaces, the material of the fourth lens 4 is H-K9L, the refractive index is 1.51, the dispersion coefficient is 64.212, the diameter of the front surface of the fourth lens 4 is 6mm, and the diameter of the rear surface of the fourth lens 4 is 8mm.

[0022] like Figure 4 As shown, the collimated beam shrinking achromatic point diagram shows that the beams after collimation and beam shrinking achromaticization by the optical collimation component are all within the diffraction-limited ring. That is, the optical quality simulation results of the 500nm, 518nm and 530nm bands are all within the diffraction limit, indicating that the beam quality in this band range can meet the design requirements.

[0023] Example 4 This utility model consists of four optical lenses, such as Figure 1 As shown, from left to right, the lenses are: first lens 1, second lens 2, third lens 3, and fourth lens 4. First lens 1 is a meniscus lens with a positive focal length, second lens 2 is a meniscus lens with a positive focal length, third lens 3 is a meniscus lens with a positive focal length, and fourth lens 4 is a plano-concave lens with a negative focal length.

[0024] As shown in Table 1, the total optical length (S1-S8) of this module is 22.5mm, and the maximum lens diameter is 8mm. The design parameters of the optical collimation component are as follows: the short half-axis divergence angle NA of the laser diode is 0.185 (the aperture will truncate the excess long half-axis divergence angle, so optimization is not required); the optical focal length of the optical collimation component is 10.85mm; the length of the optical collimation component is 12.821mm; the collimated beam diameter is 4mm; the distance from the laser diode's emitting end face to the surface of S1 is 8.321mm; the length of the optical achromatic zoom component is 13mm; the optical achromatic zoom component reduces the collimated beam diameter from 4mm to 2mm; and by using optical lenses of different materials, the material of the second lens 2 is H-K9L. The refractive index (ND) and dispersion coefficient (Vd) are 1.51 and 64.212 respectively. The material of the third lens 3 is H-ZK7, with a refractive index (ND) and dispersion coefficient (Vd) of 1.61 and 60.614 respectively. It can perform achromatic processing on the beam quality in the range of 500nm to 530nm, so that the beam quality in this band can meet the design requirements. Finally, the divergence angle of the emitted beam can be adjusted by finely adjusting the horizontal position of the third lens 3 by ±0.2mm through the mechanical structure. The working distance of this utility model is 5000mm.

[0025] Table 1. Relevant parameters of each lens The working principle of this utility model is as follows: like Figure 1 As shown, this utility model discloses a beam-shrinking achromatic laser spot module, which consists of an optical collimation component and an optical achromatic zoom component. After the laser is emitted by the laser diode (elliptical), it first passes through a preset aperture, which filters only the major axis of the elliptical spot, resulting in a circular laser spot. After passing through the optical collimation component, the spot becomes parallel light, which then enters the optical achromatic zoom component. This component can reduce the diameter of the incident parallel light beam (e.g., reduce the output beam diameter to 2mm). This utility model transforms the original physical interception of the required output beam diameter into the optical component modulation of the required beam size, thereby maximizing laser power under safety conditions. Furthermore, the optical achromatic zoom component can avoid the product accuracy change problem caused by center band drift due to long-term use of the laser diode. At the same time, this component can fine-tune the output beam angle to adapt to the working requirements of high-precision optical components.

[0026] This invention offers the advantage of lower power consumption for the laser diode drive circuit compared to existing modules under the same beam energy conditions, maximizing the lifespan of the laser diode and avoiding potential risks caused by over-power driving of the laser diode during normal use. The invention uses a second lens made of H-K9L material with a dispersion coefficient of 64.212 and a third lens made of H-ZK7 material with a dispersion coefficient of 60.614 to perform achromatic light quality processing in the 500nm to 530nm range. This achieves a narrowband achromatic design, avoiding product accuracy changes caused by center band drift due to prolonged laser diode use (such as a visible bend in a straight line at 7 meters).

[0027] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

[0028] Many other changes and modifications can be made without departing from the concept and scope of this utility model. It should be understood that this utility model is not limited to the specific embodiments, and the scope of this utility model is defined by the appended claims.

Claims

1. A beam-shrinking achromatic laser dot module, characterized in that: It includes an optical collimation component and an optical achromatic zoom component. The optical collimation component includes a first lens (1) and a second lens (2). The optical achromatic zoom component includes a third lens (3) and a fourth lens (4). The first lens (1), the second lens (2), the third lens (3) and the fourth lens (4) are arranged sequentially on the same horizontal optical axis. The distance from the center of the front surface of the first lens (1) to the light-emitting end face of the laser diode is 8.321mm, the distance from the center of the rear surface of the first lens (1) to the center of the front surface of the second lens (2) is 0.5mm, the radius of curvature of the front surface of the first lens (1) is -16.168mm, the radius of curvature of the rear surface of the first lens (1) is -6.632mm, and the center thickness of the first lens (1) is 2mm. The radius of curvature of the front surface of the second lens (2) is 84.979 mm, the radius of curvature of the rear surface of the second lens (2) is -13.516 mm, the center thickness of the second lens (2) is 3 mm, and the distance from the center of the rear surface of the second lens (2) to the center of the front surface of the third lens (3) is 5~8 mm. The radius of curvature of the front surface of the third lens (3) is 11.125 mm, the radius of curvature of the rear surface of the third lens (3) is 86.177 mm, the center thickness of the third lens (3) is 3 mm, and the distance from the center of the rear surface of the third lens (3) to the center of the front surface of the third lens (3) is 8.001 ± 0.2 mm. The radius of curvature of the front surface of the fourth lens (4) is -5.479mm, the radius of curvature of the rear surface of the fourth lens (4) is ∞, and the center thickness of the fourth lens (4) is 2mm. The second lens (2) has a dispersion coefficient of 64.212 and the third lens (3) has a dispersion coefficient of 60.614, which are used to perform achromatic aberration processing on the beam quality in the range of 500nm to 530nm.

2. The achromatic beam-shrinking laser dot module according to claim 1, characterized in that: The short-axis divergence angle NA of the laser diode is 0.

185.

3. The achromatic beam-shrinking laser dot module according to claim 1, characterized in that: The front and rear surfaces of the first lens (1) are both standard surfaces. The material of the first lens (1) is H-K9L, the refractive index is 1.51, the dispersion coefficient is 64.212, the diameter of the front surface of the first lens (1) is 4mm, and the diameter of the rear surface of the first lens (1) is 8mm.

4. The achromatic beam-shrinking laser dot module according to claim 1, characterized in that: The front and rear surfaces of the second lens (2) are both standard surfaces. The material of the second lens (2) is H-K9L, the refractive index is 1.51, the dispersion coefficient is 64.212, and the diameter of the front and rear surfaces of the second lens (2) is 8mm.

5. A beam-shrinking achromatic laser dot module according to claim 4, characterized in that: The front and rear surfaces of the third lens (3) are both standard surfaces. The material of the third lens (3) is H-ZK7, the refractive index is 1.61, the dispersion coefficient is 60.614, and the diameter of the front and rear surfaces of the third lens (3) is 8mm.

6. The achromatic beam-shrinking laser dot module according to claim 1, characterized in that: The front and rear surfaces of the fourth lens (4) are both standard surfaces. The material of the fourth lens (4) is H-K9L, the refractive index is 1.51, the dispersion coefficient is 64.212, the diameter of the front surface of the fourth lens (4) is 6mm, and the diameter of the rear surface of the fourth lens (4) is 8mm.

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