Optical system of moving head lamp

Abstract

The invention discloses an optical system of a moving head lamp, and belongs to the technical field of intelligent stage lighting, the optical system sequentially comprises a focusing lens group, a zooming lens group and an object lens group from a light source end to an emergent end along an optical axis, the object lens group comprises a first object lens, and the first object lens is located at the emergent end on the outermost side of the optical system; the first objective lens is a biconvex lens, the incident side surface of the first objective lens is an aspheric lens, and the emergent side surface of the first objective lens is a cylindrical lens. Rectangular light spots are generated through optical design instead of a mechanical cutting mode in the prior art, the problem that luminous efficiency loss and distortion coexist is solved, the luminous efficiency is improved by 30%-60%, and meanwhile, multiple adjustable annular light curtains can be formed through butt joint.

Description

Technical Field

[0001] The present invention belongs to the technical field of intelligent stage lighting, and in particular relates to an optical system of a multifunctional intelligent lamp. Background Art

[0002] Smart lights are professional stage lighting fixtures that integrate electronic, mechanical, and optical technologies. They are widely used in performances, weddings, outdoor scenes, historic buildings, cultural relics, and bars. They are dynamic light control devices, and their core consists of three major systems: optics, mechanics, electrical, and program control. Optical system design primarily considers the luminous flux utilization of the light source. Specific performance indicators include light intensity, uniformity, saturation, and spot size. These indicators are influenced by two factors: the light source and the optical system structure and material selection.

[0003] The optical system of a moving head light primarily consists of a focusing lens group (focus group), a zoom lens group (zoom group), and an objective lens group (output group). The core function of the focusing lens group is to adjust the focal position of the light beam to ensure a sharp and clear light spot. By varying the distance between the focusing lens and the light source, the degree of convergence of the light beam is controlled. When the focusing lens is close to the light source, the light beam becomes more divergent (the light spot becomes larger but the brightness decreases); when it is farther away, it becomes more convergent (the light spot becomes smaller and brighter). The core function of the zoom lens group is to control the angle of divergence of the light beam (zoom), enabling the switch from a narrow beam to a wide-angle wash light. By moving the zoom lens, the divergence angle of the light after passing through the lens is changed, allowing the same light source to output a sharp beam or a soft wash light. The core function of the objective lens group is to ultimately shape the uniformity and output characteristics of the light beam, directly affecting the quality of the light spot.

[0004] However, the light spots emitted by the moving head lights on the market are circular. When the moving head lights are required to emit rectangular light spots, a cutting piece needs to be added between the light source and the focusing lens group. This method of producing rectangular light spots has the following main shortcomings: (1) The cutting piece blocks the light source, which greatly damages the light effect; (2) The distortion after cutting cannot be well controlled, and the focusing angle of the light column is limited. Summary of the Invention

[0005] In order to overcome the problems existing in the prior art, the present invention provides an optical system for a moving head light. By replacing mechanical cutting with optical design, the problem of coexistence of light efficiency loss and distortion is solved, the light efficiency is improved by 30% to 60%, and multiple units can be docked to form an adjustable annular light curtain.

[0006] In order to solve the above problems in the prior art, the present invention adopts the following technical solutions.

[0007] An optical system of a moving head light includes a focusing lens group, a zoom lens group and an objective lens group in sequence along the optical axis from the light source end to the exit end. It is characterized in that the objective lens group includes a first objective lens, the first objective lens is located at the outermost exit end of the optical system, the first objective lens is a biconvex lens, the incident side surface of the first objective lens is an aspheric lens, and the exit side surface of the first objective lens is a cylindrical lens.

[0008] Furthermore, the aspheric surface of the first objective lens satisfies the following curvature formula:

[0009] , where X, Y, and Z are three-dimensional space coordinates, C is the vertex curvature, k is the cone coefficient, and A is the high-order aspheric coefficient.

[0010] Furthermore, the objective lens group further includes at least one second objective lens, the second objective lens is located between the zoom lens group and the first objective lens, and the second objective lens is a biconcave spherical lens.

[0011] Furthermore, the focusing lens group (2) includes, from the light source end to the emission end, the following:

[0012] First focusing lens (21): biconvex lens;

[0013] Second focusing lens (22): biconvex lens;

[0014] The third focusing lens (23): a biconcave lens;

[0015] The fourth focusing lens (24): a concave-convex lens;

[0016] The fifth focusing lens (25): a biconvex lens.

[0017] Furthermore, the zoom lens group (3) includes, from the light source end to the emission end, the following:

[0018] First zoom lens (31): a concave-convex lens;

[0019] Second zoom lens (32): a biconcave lens;

[0020] The third zoom lens (33): a concave-convex lens.

[0021] Furthermore, the absolute value range of the high-order coefficients A1~A5 satisfies |An|<10 −4 mm 1−2n , n=1,2,3,4,5.

[0022] Compared with the prior art, the present invention has achieved the following beneficial effects:

[0023] 1. In the optical system of the present application, the first objective lens group located at the outermost side of the optical system away from the light source adopts an integrated aspheric and cylindrical combination design, and uses a cylindrical mirror to form an imaging element. A rectangular light spot can be generated through optical design. Compared with the mechanical cutting method of the prior art, it is not only simple in structure, but also can collect all the light emitted by the light source into the lens, thereby improving the light efficiency by 30% to 60%. At the same time, multiple units can be connected to form an adjustable annular light curtain.

[0024] 2. The system light loss of the optical lens group of the existing moving head light is basically around 18%-20%. The optical design pioneered by this application can reduce the number of lenses in the lens group and further reduce the light loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a schematic structural diagram of the optical system of the present invention.

[0027] In the picture:

[0028] 1. Light source;

[0029] 2. Focusing lens group; 21. First focusing lens; 22. Second focusing lens; 23. Third focusing lens; 24. Fourth focusing lens; 25. Fifth focusing lens;

[0030] 3. Zoom lens group; 31. First zoom lens; 32. Second zoom lens; 33. Third zoom lens;

[0031] 4. Objective lens group; 41. First objective lens; 42. Second objective lens. DETAILED DESCRIPTION

[0032] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0033] Example 1:

[0034] like Figure 1As shown, an optical system of a moving head light includes a focusing lens group 2, a zoom lens group 3 and an objective lens group 4 along the optical axis from the light source end to the emission end. The focusing lens group 2, the zoom lens group 3 and the objective lens group 4 are located on the same axis.

[0035] The focusing group 2 changes the focal length of the beam by axial movement; the zoom group 3 adjusts the beam divergence angle by lens displacement; in the objective lens group 4: the aspheric surface corrects spherical aberration / astigmatism, and the cylindrical surface achieves asymmetric diffusion in the X / Y direction.

[0036] The objective lens group 4 includes a first objective lens 41, which is located at the outermost exit end of the optical system. The first objective lens 41 is a biconvex lens, the incident side surface of the first objective lens 41 is an aspherical lens, and the exit side surface of the first objective lens 41 is a cylindrical lens.

[0037] In a preferred embodiment, the aspheric surface of the first objective lens satisfies the following curvature formula:

[0038] , where X, Y, and Z are three-dimensional space coordinates, C is the vertex curvature, k is the cone coefficient, and A (A1, A2, A3, A4, and A5) are high-order aspheric coefficients.

[0039] The absolute value range of the high-order coefficients A1~A5 satisfies: |An|<10 −4 mm 1−2n , n=1,2,3,4,5.

[0040] The focusing lens group 2 includes, from the light source end to the emission end, a first focusing lens 21, a second focusing lens 22, a third focusing lens 23, a fourth focusing lens 24, and a fifth focusing lens 25. The first focusing lens 21, the second focusing lens 22, and the fifth focusing lens 25 are biconvex lenses, the third focusing lens 23 is a biconcave lens, and the fourth focusing lens 24 is a concave-convex lens.

[0041] The zoom lens group 3 includes, from the light source end to the emission end, a first zoom lens 31, a second zoom lens 32, and a third zoom lens 33. The first zoom lens 31 and the third zoom lens 33 are concave-convex lenses, and the second zoom lens 32 is a biconcave lens.

[0042] The optical system of this application has been verified by optical simulation software (Zemax). Within the focal length range of 30-80mm: the aspect ratio of the rectangular light spot is adjustable from 1:1.5 to 1:3, the illumination uniformity is greater than 90%, the color temperature deviation is less than 100K, and the cumulative light loss of the system is less than 8.7%.

[0043]

[0044] Example 2:

[0045] The difference between Example 2 and Example 1 is that the objective lens group 4 further includes at least one second objective lens 42, the second objective lens 42 is located between the zoom lens group 3 and the first objective lens 41, and the second objective lens 42 is a biconcave spherical lens. The biconcave lens (42) is used to compensate for chromatic aberration.

[0046]

[0047] The specific materials and parameters of the optical system listed in the embodiment are only examples of parameters under one working condition. In actual application, the material and selection parameters of each lens can be confirmed through experiments or optical simulation software (Zemax) design based on the desired imaging effect.

[0048] The contents described in the embodiments of this specification are merely an enumeration of the implementation forms of the inventive concept. The scope of protection of the present invention should not be regarded as limited to the specific forms described in the embodiments. The scope of protection of the present invention also extends to equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.

Claims

1. An optical system of a moving head light, comprising a focusing lens group (2), a zoom lens group (3) and an objective lens group (4) in sequence from the light source end to the emission end along the optical axis, characterized in that: The objective lens group (4) comprises a first objective lens (41), the first objective lens (41) is located at the outermost exit end of the optical system, the first objective lens (41) is a double convex lens, the incident side surface of the first objective lens (41) is an aspherical lens, and the exit side surface of the first objective lens is a cylindrical lens.

2. The optical system of a moving head light according to claim 1, characterized in that: The aspheric surface of the first objective lens (41) satisfies the following curvature formula: , where X, Y, and Z are three-dimensional space coordinates, C is the vertex curvature, k is the cone coefficient, and A is the high-order aspheric coefficient.

3. The optical system of a moving head light according to claim 1, characterized in that: The objective lens group (41) further comprises at least one second objective lens (42), the second objective lens (42) being located between the zoom lens group (3) and the first objective lens (41), and the second objective lens (41) being a biconcave spherical lens.

4. The optical system of a moving head light according to claim 1, characterized in that: The focusing lens group (2) comprises, from the light source end to the emission end, the following components: First focusing lens (21): biconvex lens; Second focusing lens (22): biconvex lens; The third focusing lens (23): a biconcave lens; The fourth focusing lens (24): a concave-convex lens; The fifth focusing lens (25): a biconvex lens.

5. The optical system of a moving head light according to claim 1, characterized in that: The zoom lens group (3) comprises, in order from the light source end to the emission end: First zoom lens (31): a concave-convex lens; Second zoom lens (32): a biconcave lens; The third zoom lens (33): a concave-convex lens.

6. The optical system of a moving head light according to claim 2, characterized in that: The absolute value range of the high-order coefficients A1~A5 satisfies |An|<10 −4 mm 1−2n , n=1,2,3,4,5.

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