Projection lens system and projection lamp

Abstract

The utility model discloses a projection lens system and a projection lamp. The projection lens system comprises a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a seventh lens element and an eighth lens element which are sequentially arranged from the object side to the image side. Wherein the first lens element is a meniscus-shaped lens; the second lens element is a biconvex lens; the third lens element is a plano-convex lens; the fourth lens element is a plano-convex lens; the fifth lens element is a curved plano-convex lens; the seventh lens element is a double-convex lens; and the eighth lens element is a crescent lens. According to the projection lamp, specific lens combination and optical parameter configuration are adopted, through the synergistic effect of all lens elements, the light efficiency and projection quality of the projection lamp are effectively improved, and the high-brightness and high-resolution projection effect is achieved.

Description

Technical Field

[0001] This application relates to the technical field of image display devices, and in particular, to a projection lens system and a projection lamp. Background Art

[0002] Projection lamps are mainly used in environments such as stores, shopping malls, and underground garages. They can project desired patterns on blank walls without damaging the walls or floors. It is a relatively novel way of advertising presentation and has been gradually used in various scenarios in recent years, with a vast market.

[0003] Ordinary projection lamps are relatively crude in the processing and production of the condenser part. Usually, the condenser part is simply assembled by several convex lenses to form a condenser, which results in relatively low light efficiency. If high brightness is required, the wattage of the LED lamp is increased to obtain a more satisfactory brightness, but increasing the LED wattage will lead to an increase in cost and heat dissipation area.

[0004] The projection lamp lens determines factors such as the projection area, brightness, distortion, weight, and external dimensions of the projection lamp. The projection ratio of traditional projection lamp lenses is 1:0.3 (projecting 0.3m at 1 meter) or 1:0.6. Beyond this, the lens angle will become larger and the number of lenses will also increase. Summary of the Utility Model

[0005] In order to project a larger pattern at a fixed height with uniform brightness and small distortion, this application provides a projection lens system and a projection lamp.

[0006] The projection lens system provided by this application adopts the following technical solutions:

[0007] A projection lens system includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a seventh lens element, and an eighth lens element arranged in sequence from the object side to the image side;

[0008] Among them, the first lens element is a meniscus-shaped lens; the second lens element is a double-convex lens; the third lens element is a plano-convex lens; the fourth lens element is a plano-convex lens; the fifth lens element is a plano-convex meniscus lens; the seventh lens element is a combined double-convex lens; the eighth lens element is a combined meniscus lens.

[0009] By adopting the above technical solutions, the shapes of the lens elements have been specially designed and adjusted to achieve a projection effect with high brightness and high resolution. And the specific lens shapes and combination methods enhance the light focusing ability, thereby improving the quality of the projection.

[0010] Optionally, the focal length of the first lens element is 26.739 mm, the focal length of the second lens element is -23.143 mm, the focal length of the third lens element is -31.501 mm, the focal length of the fourth lens element is -36.141 mm, the focal length of the fifth lens element is -42.594 mm, the focal length of the seventh lens element is -30.998 mm, and the focal length of the eighth lens element is -15.668 mm.

[0011] By adopting the above technical solution, the focal lengths of the lens elements satisfy specific conditions, enabling the light to achieve the best focusing effect after passing through each lens, thereby further optimizing the clarity and brightness of the projection.

[0012] Optionally, the refractive index and Abbe number of each lens element respectively satisfy the following conditions:

[0013] The refractive index and Abbe number of the first lens element are (1.49, 70.4);

[0014] The refractive index and Abbe number of the second lens element are (1.75, 52.3);

[0015] The refractive index and Abbe number of the third lens element are (1.95, 17.9);

[0016] The refractive index and Abbe number of the fourth lens element are (1.75, 52.3);

[0017] The refractive index and Abbe number of the fifth lens element are (1.75, 52.3);

[0018] The refractive index and Abbe number of the seventh lens element are (1.83, 42.7);

[0019] The refractive index and Abbe number of the eighth lens element are (1.83, 42.7).

[0020] By adopting the above technical solution, the refractive index and Abbe number of each lens element also satisfy specific conditions, which can ensure the more stable propagation of light in the lens system, reduce the scattering and chromatic aberration of light, thereby improving the optical performance of the lens and further enhancing the projection effect.

[0021] Optionally, a sixth lens element is provided between the fifth lens element and the seventh lens element, and the refractive index and Abbe number of the sixth lens element are (1.52, 64.2).

[0022] Optionally, the sixth lens element is a glass film.

[0023] By adopting the above technical solution, the glass film is used to project images or texts onto a screen. In this case, a special optical coating may be applied to the glass film to improve the clarity and contrast of the image. The glass film is sometimes also used as a filter, and through a specific coating or structure on it, certain wavelengths of light can be filtered out, thereby changing the color or characteristics of the projected image. The glass film can be used to create special visual effects, such as stereoscopic projection or augmented reality effects. Therefore, the pattern of the glass film can be quickly replaced to meet the customer's selection of different contents.

[0024] Optionally, the imaging surface diameter of the projection lens system is 28 mm.

[0025] By adopting the above technical solution, the traditional 22 mm image plane is abandoned, aiming to increase the projection area by nearly 1 / 4.

[0026] Optionally, the projection ratio of the projection lens system is 1:09.

[0027] By adopting the above technical solution, it is currently the largest projection ratio in the industry. And the outer diameter of the lens is small, reducing the weight of the projection lens system.

[0028] Optionally, a diaphragm is provided between the first lens element and the second lens element, and the aperture of the diaphragm is 10.34 mm.

[0029] A projection lamp includes the above projection lens system; and

[0030] An imaging element provided in the front stage of the optical path of the projection lens system.

[0031] By adopting the above technical solution, through a carefully designed lens system, while achieving high-brightness and high-resolution projection effects, the performance requirements for the imaging element are reduced, thereby effectively reducing the cost and heat dissipation area of the projection lens system, and improving the cost performance and reliability of the product.

[0032] Optionally, the projection lamp further includes a radiator, and the radiator is connected to the imaging element for dissipating heat from the imaging element and the projection lens system.

[0033] By adopting the above technical solution, while maintaining high-brightness and high-resolution projection, the working temperature and energy consumption of the device can be effectively reduced, and the service life and stability of the device can be improved.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] 1. Since this application uses a specific lens combination and optical parameter configuration, through the synergistic effect of each lens element, the light efficiency and projection quality of the projection lamp are effectively improved, achieving a high-brightness and high-resolution projection effect.

[0036] 2. In this application, the focal lengths of the lens elements are carefully designed so that the light can achieve the best focusing effect after passing through the lens system, thereby improving the clarity and contrast of the projection.

[0037] 3. The optimized selection of the refractive index and Abbe number of each lens element in this application ensures the stable propagation of light in the lens system, reduces chromatic aberration and scattering phenomena, and further improves the color reproduction and clarity of the projection image.

[0038] 4. When designing, lenses with high refractive values are widely used, which can effectively reduce the number of lenses and costs. Brief Description of the Drawings

[0039] Figure 1 is the optical path diagram of the projection lens system according to the embodiment of this application.

[0040] Figure 2 is the structural schematic diagram of the projection lamp according to the embodiment of this application.

[0041] Description of the Reference Numerals in the Drawings:

[0042] 10, aperture stop; 20, imaging plane; 30, imaging element; 40, radiator; 41, radiator bracket; 42, radiator body; 43, cooling fan; 50, first lens barrel; 51, connecting block; 60, second lens barrel; 70, fixed sleeve; L1 to L8, first lens element to eighth lens element. Detailed Description of the Embodiments

[0043] The following will further elaborate on this application in conjunction with the attached Figure 1-2 drawings.

[0044] Embodiment 1

[0045] As Figure 1 shown, the projection lens system provided by the embodiment of this application includes a first lens element L1, an aperture stop 10, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, a seventh lens element L7, and an eighth lens element L8, which are sequentially arranged from the object side to the image side.

[0046] Among them, the object side to the image side refers to the side of the projection object surface to the side of the imaging plane 20. In other words, it can also refer to the magnification side to the reduction side.

[0047] Specifically, the first lens element L1 is a meniscus lens with a focal length of 26.739 mm, the second lens element L2 is a biconvex lens with a focal length of -23.143 mm, the third lens element L3 is a plano-convex lens with a focal length of -31.501 mm, the fourth lens element L4 is a plano-convex lens with a focal length of -36.141 mm, the fifth lens element L5 is a meniscus plano-convex lens with a focal length of -42.594 mm, the sixth lens element L6 is a glass film, and the seventh lens element L7 is a biconvex lens with a focal length of -30.998 mm, and the eighth lens element L8 is a meniscus lens with a focal length of -15.668 mm.

[0048] In addition, the refractive indices and Abbe numbers of each lens element have been optimized to meet specific optical performance requirements. Specifically, the refractive index and Abbe number of the first lens element L1 are (1.49, 70.4), the refractive index and Abbe number of the second lens element L2 are (1.75, 52.3), the refractive index and Abbe number of the third lens element L3 are (1.95, 17.9), the refractive index and Abbe number of the fourth lens element L4 are (1.75, 52.3), the refractive index and Abbe number of the fifth lens element L5 are (1.75, 52.3), the refractive index and Abbe number of the sixth lens element L6 are (1.52, 64.2), the refractive index and Abbe number of the seventh lens element L7 are (1.83, 42.7), and the refractive index and Abbe number of the eighth lens element L8 are (1.83, 42.7). The selection of these parameters helps to reduce chromatic aberration and other aberrations and improve the clarity of the projected image.

[0049] Among them, the aperture stop 10 is located between the first lens element L1 and the second lens element L2, and its aperture is 10.34 mm. The design of the aperture stop 10 helps to limit the passing range of light, reduce the interference of stray light, and improve the contrast of the projected image.

[0050] The imaging surface 20 of the projection lens system in this embodiment has a diameter of 28 mm, and the traditional 22 mm image surface is abandoned, aiming to increase the projection area by nearly 1 / 4. In this embodiment, the imaging surface 20 of the projection lens system refers to the lens image surface of the sixth lens element L6. Among them, the projection ratio of the projection lens system is 1:09. In the industry, it is currently the largest projection ratio, and the outer diameter of the lens is small, reducing the weight of the projection lamp.

[0051] The following table shows the lens material parameter descriptions of the projection lens system:

[0052]

[0053]

[0054] As can be seen from the above table, in the design of the embodiments of the present application, lenses with high refractive indices are widely used, which can effectively reduce the number and cost of lenses and the volume of the projection lens system. By adopting a specific lens combination and optical parameter configuration, through the synergistic effect of each lens element, the light efficiency and projection quality of the projection lamp are effectively improved, achieving a high-brightness and high-resolution projection effect.

[0055] Embodiment 2

[0056] Referring to Figure 2 , the projection lamp provided by the embodiments of the present application includes the projection lens system described in Embodiment 1 and an imaging element 30 provided in the front stage of the optical path of the projection lens system. The imaging element 30 can be an LED lamp, a laser, or other suitable projection imaging elements for generating the light required for projection. In this embodiment, the imaging element 30 is a small-target surface LED lamp bead with a power of 30 W - 120 W, and the eighth lens element L8 and the seventh lens element L7 can effectively convert the light emitted by the small-target surface LED lamp bead into a straight line incident on the sixth lens element L6.

[0057] Referring to Figure 2 , the projection lamp of the present application further includes a radiator 40, which is connected to the imaging element 30 and is used to dissipate heat from the imaging element 30 and the projection lens system.

[0058] Specifically, the radiator 40 includes a radiator bracket 41, a radiator body 42, and a cooling fan 43. The radiator body 42 is installed in the radiator bracket 41. The imaging element 30 is installed at one end of the radiator body 42, and the cooling fan 43 is installed at the other end of the radiator body 42. The air outlet side direction of the cooling fan 43 is away from the imaging element 30 to dissipate the heat transferred from the imaging element 30 to the radiator body 42 out of the radiator body 42. Specifically, the cooling fan 43 can control the temperature of the radiator body 42 within 45°C, greatly increasing the service life of the imaging element 30.

[0059] In addition, the projection lamp further includes a first lens barrel 50 and a second lens barrel 60. The first lens barrel 50 is mounted on the radiator body 42 through a connecting block 51. The eighth lens element L8, the seventh lens element L7, and the sixth lens element L6 are sequentially arranged on the first lens barrel 50 along the light transmission direction. A fixed sleeve 70 is also mounted on the radiator body 42. The first lens barrel 50 is located inside the fixed sleeve 70. The second lens barrel 60 is mounted on the fixed sleeve 70 and both ends of the second lens barrel 60 penetrate through the fixed sleeve 70. The fifth lens element L5, the fourth lens element L4, the third lens element L3, the second lens element L2, the diaphragm 10, and the first lens element L1 are sequentially arranged on the second lens barrel 60 along the light transmission direction. An operation space is reserved between the first lens barrel 50 and the second lens barrel 60, which facilitates personnel to replace the sixth lens element L6 and meets the customer's selection of different contents.

[0060] Of course, the projection lamp further includes other components to form a waterproof and dustproof projection lamp. The other components are relatively conventional and will not be elaborated here.

[0061] In summary, the projection lamp of the present application is overall IP65 dustproof and waterproof and can be used in a variety of indoor and outdoor scenarios. And after being assembled, the overall height of the projection lamp is within 250 mm (the distance from the front end of the second lens barrel 60 to the rear end of the radiator bracket 41), with a small appearance and being about 40% smaller in height than projection lamps of the same wattage. These designs enable the projection lens system and the projection lamp of the present application to have a wide application prospect in occasions such as stores, shopping malls, and underground garages that require large-screen projection.

[0062] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A projection lens system, characterized in that: The lens comprises a first lens element (L1), a second lens element (L2), a third lens element (L3), a fourth lens element (L4), a fifth lens element (L5), a seventh lens element (L7) and an eighth lens element (L8) which are arranged in sequence from the object side to the image side; Among them, the first lens element (L1) is a meniscus-shaped lens; the second lens element (L2) is a biconvex lens; the third lens element (L3) is a plano-convex lens; the fourth lens element (L4) is a plano-convex lens; the fifth lens element (L5) is a curved plano-convex lens; the seventh lens element (L7) is a biconvex lens; the eighth lens element (L8) is a meniscus-shaped lens; the focal length of the first lens element (L1) is 26.739 mm, the focal length of the second lens element (L2) is -23.143 mm, the focal length of the third lens element (L3) is -31.501 mm, the focal length of the fourth lens element (L4) is -36.141 mm, the focal length of the fifth lens element (L5) is -42.594 mm, the focal length of the seventh lens element (L7) is -30.998 mm, and the focal length of the eighth lens element (L8) is -15.668 mm.

2. The projection lens system according to claim 1, wherein: The refractive index and Abbe number of each lens element satisfy the following conditions: The refractive index and Abbe number of the first lens element (L1) are (1.49, 70.4); The refractive index and Abbe number of the second lens element (L2) are (1.75, 52.3); The refractive index and Abbe number of the third lens element (L3) are (1.95, 17.9); The refractive index and Abbe number of the fourth lens element (L4) are (1.75, 52.3); The refractive index and Abbe number of the fifth lens element (L5) are (1.75, 52.3); The refractive index and Abbe number of the seventh lens element (L7) are (1.83, 42.7); The refractive index and Abbe number of the eighth lens element (L8) are (1.83, 42.7).

3. The projection lens system according to claim 2, wherein: A sixth lens element (L6) is disposed between the fifth lens element (L5) and the seventh lens element (L7), and the refractive index and Abbe number of the sixth lens element (L6) are (1.52, 64.2).

4. The projection lens system according to claim 3, wherein: The sixth lens element (L6) is a glass film.

5. The projection lens system according to claim 1, wherein: The imaging surface (20) of the projection lens system has a diameter of 28 mm.

6. The projection lens system according to claim 1, wherein: The projection ratio of the projection lens system is 1:

09.

7. The projection lens system according to claim 1, wherein: An aperture (10) is arranged between the first lens element (L1) and the second lens element (L2), and the aperture of the aperture (10) is 10.34 mm.

8. A projection lamp, characterized in that: A projection lens system comprising any one of claims 1 to 7; and An imaging element (30) is arranged at the front stage of the optical path of the projection lens system.

9. The projection lamp according to claim 8, characterized in that: The projection lamp also includes a heat sink (40), which is connected to the imaging element (30) and is used to dissipate heat for the imaging element (30) and the projection lens system.

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