A high-resolution lens for color laser stage light beams

Abstract

The utility model belongs to stage light technical field of lens, especially a kind of high-resolution lens of colour laser stage light beam, aiming at the beam lamp lens of existing market is mostly 4-piece structure, it is difficult to effectively eliminate chromatic aberration and other aberrations, and resolution is lower, cannot satisfy the demand of pattern long-distance clear projection under colour laser light source, seriously affect the visual effect of stage light problem, present and propose the following scheme, it includes first lens, second lens, third lens, fourth lens, fifth lens, sixth lens and seventh lens are sequentially arranged and constitute optical system.The utility model is through 3 groups 7-piece structure's multiple lenses cooperation, finally realize the optical parameter of focal length 215mm, F number 1.8, long-distance clear projection of colour laser pattern, while ensuring that spot color synthesis is accurate, edge is clear.

Description

Technical Field

[0001] This utility model relates to the field of stage lighting optical lens technology, and in particular to a high-resolution lens for a colored laser stage light beam. Background Technology

[0002] With the widespread application of colored laser light sources in stage lighting, the demand for stage lighting beam lenses suitable for colored lasers is increasing. Colored lasers synthesize white light using the three primary colors of red, green, and blue at specific wavelengths, featuring narrow half-wavelengths, high brightness, and good coherence, resulting in extremely high color synthesis accuracy. To adapt to these characteristics, the beam lens needs precise control over both transverse and axial chromatic aberration to ensure effective color synthesis at the edges of the projected light spot.

[0003] However, most beam lights on the market are of a 4-element structure, which makes it difficult to effectively eliminate chromatic aberration and other aberrations, and the resolution is low, which cannot meet the requirement of clear projection of patterns over long distances under colored laser light sources, seriously affecting the visual effect of stage lighting. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing beam lights, which are mostly 4-element structures, making it difficult to effectively eliminate chromatic aberration and other aberrations, and having low resolution. These shortcomings fail to meet the requirement of clear projection of patterns over long distances under colored laser light sources, seriously affecting the visual effect of stage lighting. Therefore, this invention proposes a high-resolution beam lens for colored laser stage lights.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A high-resolution lens for a colored laser stage light beam includes an optical system consisting of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially. The optical system has a focal length of 215mm, an F-number of 1.8, and a total length of 380mm.

[0007] Preferably, the third and fourth lenses are cemented lens groups, which are formed by cementing a high-refractive-index, low-Abbe number meniscus lens with a low-refractive-index, high-Abbe number convex lens.

[0008] Preferably, the optical system further includes two lanthanide glass lenses, designated as the second and sixth lenses, to improve the resolution of the optical system.

[0009] Preferably, the optical system is a 3-group, 7-element structure, which controls the transverse chromatic aberration and axial chromatic aberration through the cooperation of multiple lenses.

[0010] Preferably, the optical system is adapted to a colored laser light source, which synthesizes white light from the three primary colors of red, green and blue at specific wavelengths, and has the characteristics of narrow half-wavelength, high brightness and good coherence.

[0011] Preferably, the Abbe number of the high-refractive-index, low-Abbe-number meniscus lens is less than 30, and the Abbe number of the low-refractive-index, high-Abbe-number convex lens is greater than 50.

[0012] Preferably, the two lanthanide glass lenses are respectively disposed in the middle group and the rear group of the optical system for staged aberration correction.

[0013] Preferably, the surface of each lens in the optical system is coated with an anti-reflection film, and the center wavelength of the anti-reflection film matches the wavelengths of the three primary colors of the color laser: red, green, and blue.

[0014] Preferably, the RMS radius of each field of view in the standard point array is less than 50 μm, which meets the requirements for high-resolution imaging.

[0015] Preferably, the maximum ray deviation in the ray fan pattern is less than 0.7 μm, ensuring the consistency of ray focusing.

[0016] Preferably, the maximum field curvature in the field curvature distortion image is less than 0.1 mm, and the maximum distortion is less than 2%, ensuring that the imaging surface is flat and has minimal deformation.

[0017] Preferably, the maximum vertical color difference in the vertical color difference diagram is less than 10μm, achieving accurate color synthesis.

[0018] Preferably, in the MTF chart, the MTF value of each field of view at a spatial frequency of 30 cycles / mm is greater than 0.3, ensuring imaging clarity at high spatial frequencies.

[0019] The beneficial effects of the high-resolution lens for a colored laser stage light beam described in this utility model are as follows:

[0020] When a colored laser light source (white light synthesized from red, green, and blue primary colors) is incident on the stage light beam lens of this invention, it first enters a cemented lens assembly (a high-refractive-index, low-Abbe number meniscus lens cemented together with a low-refractive-index, high-Abbe number convex lens). Due to the difference in refractive index and Abbe number between the two lenses, their refraction and dispersion effects on different wavelengths of light are complementary, effectively canceling transverse and axial chromatic aberration and preventing color separation at the edge of the light spot. Subsequently, the light passes through an optical system containing two lanthanide glass lenses. Lanthanide glass has high-resolution characteristics and can deeply correct aberrations in the light, significantly improving the resolution of the entire optical system.

[0021] By using a cemented design of a high-refractive-index, low-Abbe-number meniscus lens and a low-refractive-index, high-Abbe-number convex lens, the transverse and axial chromatic aberrations are effectively offset, ensuring accurate color synthesis at the edge of the colored laser spot without color separation.

[0022] The system employs a 3-group, 7-element structure with two lanthanide glass lenses, significantly improving the resolution of the optical system and enabling clear projection of patterns over long distances.

[0023] Custom-designed for the characteristics of colored laser light sources (white light synthesized from red, green and blue primary colors, with narrow half-wavelength and good coherence), the color synthesis is accurate and fully meets the high-quality visual requirements of stage lighting. Attached Figure Description

[0024] Figure 1 This is a 2D design drawing of the stage light beam lens in an embodiment of this utility model;

[0025] Figure 2 This is a standard dot diagram of the lens in an embodiment of this utility model;

[0026] Figure 3 This is a ray fan diagram of the lens in an embodiment of the present invention;

[0027] Figure 4 This is a field curvature distortion diagram of the lens in an embodiment of this utility model;

[0028] Figure 5 This is a chromatic aberration diagram of the lens in an embodiment of this utility model;

[0029] Figure 6 This is the MTF diagram of the lens in the embodiment of this utility model.

[0030] In the diagram: 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Sixth lens; 7. Seventh lens. Detailed Implementation

[0031] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this embodiment, and not all embodiments.

[0032] Example

[0033] The following is combined with Figures 1-6 This application will be described in further detail.

[0034] A high-resolution lens for a colored laser stage light beam includes an optical system consisting of a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, and a seventh lens 7 arranged sequentially. The optical system has a focal length of 215mm, an F-number of 1.8, and a total length of 380mm.

[0035] In this embodiment, the third lens 3 and the fourth lens 4 are a cemented lens group, which is formed by cementing a high-refractive-index, low-Abbe number meniscus lens with a low-refractive-index, high-Abbe number convex lens.

[0036] In this embodiment, the optical system also includes two lanthanide glass lenses, namely the sixth lens 2 and the seventh lens 6, which are used to improve the resolution of the optical system.

[0037] In this embodiment, the optical system is a 3-group, 7-element structure, which controls the transverse chromatic aberration and axial chromatic aberration through the cooperation of multiple lenses.

[0038] In this embodiment, the stage light beam lens is designed to be compatible with a colored laser light source (white light synthesized from the three primary colors of red light with a wavelength of 638nm±5nm, green light with a wavelength of 520nm±5nm, and blue light with a wavelength of 450nm±5nm). Its optical system adopts a 3-group, 7-element structure, and the specific lens composition and arrangement are as follows: Figure 1 As shown (groups 1 to 3 are arranged sequentially along the direction of light incidence):

[0039] Group 1 (front group): contains two independent lenses, namely a plano-convex lens (material H-K9L, refractive index 1.5168, Abbe number 64.1) and a biconcave lens (material H-ZF2, refractive index 1.6725, Abbe number 32.2), used to initially focus the incident laser and correct spherical aberration.

[0040] Group 2 (Middle Group): Contains 3 lenses, the first 2 of which are cemented lenses, and the last lens is a lanthanum glass lens. Specifically:

[0041] Cemented lens group: This group consists of a high-refractive-index, low-Abbe number meniscus lens (material H-ZF7, refractive index 1.7847, Abbe number 25.7) and a low-refractive-index, high-Abbe number convex lens (material H-K5, refractive index 1.5224, Abbe number 59.8) bonded together using optical adhesive. Due to the difference in their Abbe numbers (25.7 < 30, 59.8 > 50), their dispersion effects on red, green, and blue light are complementary, effectively canceling transverse chromatic aberration (e.g., ...). Figure 5 As shown, the maximum vertical color difference is <10μm.

[0042] Lanthanum glass lens: Made of LaK33A material (refractive index 1.7497, Abbe number 44.9), it has high resolution characteristics and is used to further correct astigmatism in the intermediate field of view and improve image clarity.

[0043] Group 3 (Rear Group): Contains two lenses: another lanthanum glass lens (material LaF21, refractive index 1.7882, Abbe number 47.4) and a biconvex lens (material H-QK3, refractive index 1.4874, Abbe number 70.2). The lanthanum glass lens works in conjunction with the lanthanum glass lens in the middle group to correct edge field aberrations in stages; the biconvex lens is used to finally converge the light rays, ensuring that the focal length is stabilized at 215mm.

[0044] In this embodiment, the total length of the optical system (from the incident surface of the first lens in the first group to the exit surface of the last lens in the third group) is 380mm, and the F-number (the reciprocal of the relative aperture) is 1.8, which meets the requirements for long-distance projection (the projection distance can reach 10-50m).

[0045] In this embodiment, to reduce light reflection loss, all lenses are coated with a broadband antireflection film on their air contact surfaces. The center wavelength of the antireflection film matches the three primary color wavelengths of the colored laser (450nm, 520nm, 638nm), ensuring that the transmittance of each wavelength of light is >99% and avoiding stray light interference.

[0046] From the perspective of aberration performance (e.g.) Figure 2-6 As shown):

[0047] Standard point array diagram ( Figure 2 In the field of view (0°, 0.5°, 1°), the RMS radius of each field of view is <50μm, which is much smaller than the Airy disk radius (68μm), indicating a high energy concentration.

[0048] Ray fan diagram ( Figure 3 The results show that the maximum deviation of light at each wavelength is <0.7μm, indicating good focusing consistency.

[0049] Field distortion diagram ( Figure 4 In this model, the maximum field curvature is <0.1mm, the maximum distortion is <2%, and the imaging surface is flat with no obvious deformation.

[0050] MTF diagram ( Figure 6 In the spatial frequency of 30 cycles / mm, the MTF value of each field of view is >0.3, which satisfies the clear projection of high-resolution patterns (such as 1024×768 pixels).

[0051] In use, the red, green, and blue lasers emitted by the colored laser source first enter the first group of lenses. After preliminary focusing and spherical aberration correction, they enter the second group. Through the dispersive complementarity of the cemented lens group, the transverse and axial chromatic aberrations are significantly reduced. Then, the astigmatism is corrected by the middle group of lanthanide glass lenses. Finally, the aberrations are further corrected and focused by the third group of lenses, ultimately projecting a light spot with clear edges and accurate color synthesis, which is perfectly suited to the stage lighting's requirements for colored laser projection.

[0052] The above description is only a preferred embodiment of this practice, but the scope of protection of this embodiment is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope of the technology disclosed in this embodiment, based on the technical solution and the inventive concept of this embodiment, should be covered within the scope of protection of this embodiment.

Claims

1. A high-resolution lens for a colored laser stage light beam, characterized in that, An optical system consisting of a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5), a sixth lens (6), and a seventh lens (7) arranged in sequence, wherein the focal length of the optical system is 215mm, the F number is 1.8, and the total length is 380mm.

2. The high-resolution lens for a colored laser stage light beam according to claim 1, characterized in that, The third lens (3) and the fourth lens (4) are cemented lens groups, which are formed by cementing a meniscus lens with high refractive index and low Abbe number with a convex lens with low refractive index and high Abbe number.

3. The high-resolution lens for a colored laser stage light beam according to claim 2, characterized in that, The optical system also includes two lanthanide glass lenses, namely the second lens (2) and the sixth lens (6), which are used to improve the resolution of the optical system.

4. The high-resolution lens for a colored laser stage light beam according to claim 3, characterized in that, The optical system is a 3-group, 7-element structure that controls vertical and axial chromatic aberration through the cooperation of multiple lenses.

5. A high-resolution lens for a colored laser stage light beam according to claim 4, characterized in that, The optical system is adapted to a colored laser light source, which is composed of white light synthesized from the three primary colors of red, green and blue.

6. A high-resolution lens for a colored laser stage light beam according to claim 5, characterized in that, The high-refractive-index, low-Abbe-number meniscus lens has an Abbe number of less than 30, while the low-refractive-index, high-Abbe-number convex lens has an Abbe number greater than 50.

7. A high-resolution lens for a colored laser stage light beam according to claim 6, characterized in that, The two lanthanide glass lenses are respectively placed in the middle and rear groups of the optical system for staged aberration correction.

8. A high-resolution lens for a colored laser stage light beam according to claim 7, characterized in that, The surface of each lens in the optical system is coated with an anti-reflection film, and the center wavelength of the anti-reflection film matches the wavelengths of the three primary colors of the color laser: red, green, and blue.

Images