A dual-lens cross optical system

Abstract

The utility model discloses a cross optical system of double lens, including the light source module of equal height coaxial, first lens and second lens, the light of light source module emission passes first lens, first lens emits preformed light spot to second lens, and second lens emits rectangular light spot, the light -emitting surface of first lens and second lens is all the free surface, and the light -entering surface of first lens is the plane, and the light -entering surface of second lens is the rectangular plane, the utility model reaches the beneficial effect is: through the special lens setting improves the light efficiency utilization rate.

Description

Technical Field

[0001] This utility model relates to the field of lens device technology, and in particular to a cross optical system with two lenses. Background Technology

[0002] In existing LED long-path lighting systems, the light source typically exhibits an approximate Lambertian light distribution characteristic, with an initial divergence half-angle of 60° (total divergence angle 120°) and a circular emitted light spot. Two sets of lenses are then used to guide the light into the LCD screen. The first lens group employs a rotationally symmetric aspherical optical design to receive and compress the LED emitted beam, adjusting the divergence half-angle to the range of 30°~45° to form a circularly symmetric central light spot; the diameter of this light spot is designed to be equal to the diagonal length of the effective light-passing surface of the second lens group. The second lens group uses a rotationally symmetric aspherical collimator, and its incident surface needs to be adapted to the rectangular receiving requirements through a mechanical cutting process. This process leads to the following inherent defects: (1) Forced cutoff of light energy: After the circular optical element is cut into a rectangle, the light energy in the edge area (accounting for 15%–25% of the original light flux) is irreversibly lost, and the measured initial light efficiency loss of the system is ≥18%; (2) Efficiency decay over long optical path: When the optical path exceeds 3 times the physical thickness of the lens group, the beam diffusion effect and cutting loss are superimposed, and the transmission efficiency decreases nonlinearly with the extension of the optical path - for every doubling of the optical path length, the system optical efficiency decreases by 8%–12%.

[0003] In summary, existing technologies, due to the fundamental conflict between rotationally symmetric optical design and the requirements of rectangular receivers, must rely on destructive cutting processes, resulting in irreversible degradation of luminous efficacy in long-path lighting and failing to meet the needs of high-efficiency lighting.

[0004] Therefore, the purpose of this invention is to improve the design of the two sets of optical lenses to achieve a high effective light utilization rate in directional lighting applications such as projection lighting. Utility Model Content

[0005] The purpose of this invention is to propose a dual-lens cross optical system that can eliminate the light energy waste caused by the mismatch of the light spot shape emitted by the first lens through the improvement of lens design, and significantly improve the long optical path illumination efficiency; and achieve stable light energy transmission efficiency during long optical path illumination.

[0006] The purpose of this utility model is to achieve a dual-lens cross optical system through the following technical solution, including a light source module with equal height and coaxial alignment, a first lens, and a second lens; The light emitted from the light source module passes through the first lens, the first lens emits a pre-shaped light spot to the second lens, and the second lens emits a rectangular light spot. The light-emitting surfaces of both the first lens and the second lens are freeform surfaces, the light-incident surface of the first lens is a plane, and the light-incident surface of the second lens is a rectangular plane.

[0007] Furthermore, the width of the light-emitting surface of the light source module is 3.00mm~3.50mm, and the length is 3.00mm~3.50mm. Preferably, the area of ​​the light-emitting surface is 3.25mm×3.25mm; the initial divergence angle of the light source module is 120°.

[0008] Furthermore, the distance between the light-emitting surface of the light source module and the light-incident surface of the first lens along the optical axis is D1, wherein 0mm≤D1≤1.0mm; preferably, D1=0.8mm.

[0009] Further, the length L of the first lens is 13.50mm~14.20mm, the width W is 14.50mm~15.00mm, and the height H is 8.50mm~9.00mm. Preferably, the dimensions of the first lens are: 13.93mm (L) × 14.66mm (W) × 8.7mm (H).

[0010] Furthermore, the light-emitting surface of the first lens is divided into multiple cross-sections along the X-axis or Y-axis direction. The contour curve of the single-sided cross-section in the X-axis direction satisfies a first curve equation, and the contour curve of the single-sided cross-section in the Y-axis direction satisfies a second curve equation. Wherein, the X-axis is the length direction of the first lens, and the Y-axis is the width direction of the first lens. The equation of the first curve is: ; in, , For the first radius of curvature, the =4.90183; The first conic coefficient, the =-0.55566; express The radial distance of a point in the direction perpendicular to the optical axis, i.e., from the optical axis to... Distance between points; The equation of the second curve is: ; in, , The second radius of curvature, the =5.7746; The second conic coefficient, the =-0.4226; The light-emitting surface is formed by connecting the contour curves of various cross-sections along the X-axis or Y-axis.

[0011] Furthermore, the refractive index of the first lens is as follows: 1.5≤Nd≤1.6; where Nd is the refractive index of the first lens. Preferably, Nd=1.53.

[0012] Further, the length L1 of the second lens is 30.05mm~31.05mm, the width W1 is 26.00mm~27.00mm, and the height H1 is 13.00mm~13.50mm. Preferably, the dimensions of the second lens are: 31mm (L1) × 26.5mm (W1) × 13.1mm (H1).

[0013] Further, the rectangular plane of the light-incident surface of the second lens has a length of 30.05mm~31.05mm and a width of 26.00mm~27.00mm; preferably, the area of ​​the rectangular plane of the second lens is 31mm×26.5mm.

[0014] Furthermore, the light-emitting surface of the second lens is divided into multiple cross-sections along the X-axis and / or Y-axis directions. The contour curve of the single-sided cross-section in the X-axis direction satisfies the third curve equation, and the contour curve of the single-sided cross-section in the Y-axis direction satisfies the fourth curve equation, where the X-axis is the length direction of the second lens and the Y-axis is the width direction of the second lens. The equation of the third curve is: ; in, , The third radius of curvature, the =22.1846; The first conic coefficient, the =-0.808171; express The radial distance of a point in the direction perpendicular to the optical axis, i.e., from the optical axis to... Distance between points; The equation of the fourth curve is: ; in, , The second radius of curvature, the =19.4493; The second conic coefficient, the =-0.738933.

[0015] Furthermore, the distance between the light-emitting surface of the light source module and the light-emitting surface of the second lens along the optical axis is D2, wherein 32mm≤D2≤35.0mm; preferably, D2=33mm.

[0016] This utility model has the following advantages: This invention utilizes a first lens, a freeform surface lens integrated within an LED light source, to perform initial angle compression on the original light beam, converging the emitted half-angle within a certain range and forming a pre-rectangular light spot. A second lens, a freeform surface shaping lens, is then added to form a composite optical system. The second lens further homogenizes the light beam passing through the first lens and controls the divergence angle to obtain a uniform rectangular light spot. This optical system reduces energy loss from subsequent optical components through pre-packaging-level beam convergence. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the optical system of this utility model; Figure 2 This is a schematic diagram of the first lens of this utility model in the XY direction; Figure 3 This is a schematic diagram of the emitted light spot of the optical system of this utility model. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0019] It should be noted that the orientation or positional relationship indicated by terms such as "left" and "right" is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this utility model is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. Such terms are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other. Example

[0021] See Figure 1 This utility model provides a projector lighting system and a projector, including a light source module 1, a first lens 2 and a second lens 3 arranged coaxially at the same height; the light source module 1 includes an LED light source; The light emitted from the light source module 1 passes through the first lens 2, from which a pre-shaped light spot is emitted; the pre-rectangular light spot passes through the second lens 3, from which a rectangular light spot is emitted; both the first lens 2 and the second lens 3 are freeform lenses, which are optical elements whose one or two surfaces are complex three-dimensional curved surfaces that are not rotationally symmetric. This surface shape can be designed according to specific lighting or imaging requirements to achieve high-precision control over the beam distribution, direction, and shape; the incident surface of the second lens 3 is a rectangular plane. The distance between the light-emitting surface of the light source module 1 and the light-incident surface of the first lens 2 along the optical axis is D1, where 0mm≤D1≤1.0mm and D1=0.8mm; the distance between the light-emitting surface of the light source module 1 and the light-exiting surface of the second lens 3 along the optical axis is D2, where 32mm≤D2≤35.0mm and D2=33mm.

[0022] By integrating a first lens 2 into the LED light source, the original light beam is compressed at a primary angle, and the emitted half-angle is converged within a certain range to form a pre-rectangular light spot; then a second lens 3 is set to obtain a uniform rectangular light spot, thus forming a composite optical system.

[0023] See Figure 2 The first lens 2 includes a body, which is surrounded by an incident surface, a side surface, and an exit surface. The incident surface is the bottom plane of the lens, the side surface is disposed on the base surface and is formed around the base surface, and the exit surface is a curved surface. The length L of the first lens is 13.50mm~14.20mm, the width W is 14.50mm~15.00mm, and the height H is 8.50mm~9.00mm. Preferably, the dimensions of the first lens are: 13.93mm (L) × 14.66mm (W) × 8.7mm (H).

[0024] Furthermore, the length direction of the first lens 2 body is defined as the X-axis, and the light rays along the X-axis direction are defined as uniformly distributed. The width direction of the body is defined as the Y-axis, and the light rays along the Y-axis direction are defined as having decreasing brightness from the center to the edge. The vertical direction of the body is defined as the Z-axis, and its origin is the center point of the bottom plane of the lens. The light-emitting surface of the first lens 2 is divided into multiple sections along the X-axis or Y-axis direction. The contour curve of the single-sided section in the X-axis direction satisfies the first curve equation, and the contour curve of the single-sided section in the Y-axis direction satisfies the second curve equation. The equation of the first curve is: ; in, , For the first radius of curvature, the =4.90183; The first conic coefficient, the =-0.55566; =0.00000E+00; =1.72203E-03; = -1.50545E-04; =3.08331E-06; =-1.32015E-8.

[0025] The equation of the second curve is:

[0026] in, , The second radius of curvature, the =5.7746; The second conic coefficient, the =-0.4226; =0.00000E+00; =1.0654E-03; =-8.14755E-05; =1.21294E-06; =3.17664E-10; The light-emitting surface of the first lens 2 is formed by connecting the contour curves of various cross-sections in the X-axis or Y-axis direction.

[0027] In some specific embodiments, the refractive index of the first lens satisfies the following relationship: 1.5≤Nd≤1.6; where Nd is the refractive index of the first lens; preferably, Nd=1.53.

[0028] In some specific embodiments, the length L1 of the second lens 3 is 30.05mm~31.05mm, the width W1 is 26.00mm~27.00mm, and the height H1 is 13.00mm~13.50mm. Preferably, the dimensions of the second lens are: 31mm (L1) × 26.5mm (W1) × 13.1mm (H1).

[0029] Furthermore, the light-emitting surface of the second lens 3 is divided into multiple cross-sections along the X-axis and / or Y-axis directions. The contour curve of the single-sided cross-section in the X-axis direction satisfies the third curve equation, and the contour curve of the single-sided cross-section in the Y-axis direction satisfies the fourth curve equation, where the X-axis is the length direction of the second lens and the Y-axis is the width direction of the second lens. The equation of the third curve is: ; in, , The third radius of curvature, the =22.1846; The first conic coefficient, the =-0.808171; express The radial distance of a point in the direction perpendicular to the optical axis, i.e., from the optical axis to... Distance between points; =0.00000E+00; =1.53705E-06; = -1.14312E-07; =5.73918E-10; =2.66606E-13; The equation of the fourth curve is:

[0030] in, , The second radius of curvature, the =19.4493; The second conic coefficient, the =-0.738933; =0.00000E+00; =-1.3399E-07; = 1.07463E-08; =-1.85714E-10; =6.05550E-13.

[0031] When an LED light source is selected for the light source module, the LED light source has an approximate Lambertian light distribution curve characteristic, with an initial divergence angle of 120 degrees, corresponding to a circular distribution of the emitted light spot; this optical system uses a double freeform surface lens group to form a cross optical path structure, including a first lens 2 and a second lens 3 arranged sequentially along the optical axis. The first lens 2 is a rotationally symmetric aspherical optical design that receives and modulates the diverging beam of the LED light source. The freeform surface of the light-emitting surface of the first lens 2 compresses the divergence angle of the beam to the target angle range and forms an approximately rectangular pre-rectangular light spot. The size of the pre-rectangular light spot is optimized and is 5%-10% larger than the effective light-incident surface size of the second lens 3 to ensure that the pre-rectangular light spot completely covers the rectangular incident surface of the second lens and avoids light energy loss caused by the mismatch between the circular light spot and the rectangular receiving surface. The incident surface of the second lens 3 is a geometrically optimized rectangular plane, and the exit surface is a freeform surface symmetrical about the X / Y axis. The second lens 3 guides the light path of the central light spot through the synergistic optical effect of the incident surface of the rectangular plane and the exit surface of the freeform surface, and finally outputs a uniform rectangular light spot with a divergence angle ≤12°.

[0032] This invention designs a lens structure that significantly improves light energy utilization under small-angle uniform rectangular spot illumination conditions by optimizing the light distribution and lens curvature parameters in the optical path. Compared to traditional structures, this system can improve luminous efficiency by more than 10%, effectively overcoming the optical efficiency bottleneck caused by the limitation of simultaneously satisfying small angle and uniform rectangular spot conditions in conventional designs.

[0033] The above embodiments only illustrate preferred implementation methods, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A dual-lens cross optical system, characterized in that: It includes a coaxial light source module (1) of equal height, a first lens (2) and a second lens (3); The light emitted from the light source module (1) passes through the first lens (2), the first lens (2) emits a pre-shaped light spot to the second lens (3), and the second lens (3) emits a rectangular light spot; The light-emitting surfaces of the first lens (2) and the second lens (3) are both freeform surfaces. The light-incident surface of the first lens (2) is a plane, and the light-incident surface of the second lens (2) is a rectangular plane.

2. The dual-lens cross optical system according to claim 1, characterized in that, The light-emitting surface of the light source module (1) has a width of 3.00mm~3.50mm and a length of 3.00mm~3.50mm; the initial divergence angle of the light source module (1) is 120°.

3. A dual-lens cross optical system according to claim 1, characterized in that, The distance between the light-emitting surface of the light source module (1) and the light-incident surface of the first lens (2) along the optical axis is D1, where 0mm≤D1≤1.0mm.

4. The dual-lens cross optical system according to claim 1, characterized in that, The first lens (2) has a length of 13.50mm~14.20mm, a width of 14.50mm~15.00mm, and a height of 8.50mm~9.00mm.

5. A dual-lens cross optical system according to claim 4, characterized in that, The light-emitting surface of the first lens (2) is divided into multiple sections along the X-axis and / or Y-axis directions. The contour curve of the single-sided section in the X-axis direction satisfies the first curve equation, and the contour curve of the single-sided section in the Y-axis direction satisfies the second curve equation. The X-axis is the length direction of the first lens (2), and the Y-axis is the width direction of the first lens (2). The light-emitting surface is formed by connecting the contour curves of various cross-sections along the X-axis or Y-axis.

6. A dual-lens cross optical system according to claim 5, characterized in that, The refractive index of the first lens (2) satisfies the following relationship: 1.5≤Nd≤1.6; where Nd is the refractive index of the first lens.

7. The dual-lens cross optical system according to claim 1, characterized in that, The second lens (3) has a length of 30.05mm~31.05mm, a width of 26.00mm~27.00mm, and a height of 13.00mm~13.50mm.

8. The dual-lens cross optical system according to claim 1, characterized in that, The rectangular plane of the incident surface of the second lens (3) has a length of 30.05mm~31.05mm and a width of 26.00mm~27.00mm.

9. A cross-optical system with two lenses according to claim 8, characterized in that, The light-emitting surface of the second lens (3) is divided into multiple sections along the X-axis and / or Y-axis directions. The contour curve of the single-sided section in the X-axis direction satisfies the third curve equation, and the contour curve of the single-sided section in the Y-axis direction satisfies the fourth curve equation. The X-axis is the length direction of the second lens (3), and the Y-axis is the width direction of the second lens (3). The light-emitting surface is formed by connecting the contour curves of various cross-sections along the X-axis or Y-axis.

10. A dual-lens cross optical system according to claim 9, characterized in that, The distance between the light-emitting surface of the light source module (1) and the light-emitting surface of the second lens (3) along the optical axis is D2, wherein 32mm≤D2≤35.0mm.

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