High-definition and oil mist-proof optical lens and stage lamp thereof

Abstract

The utility model discloses a high-definition and oil mist-proof optical lens and a stage lamp thereof. Comprising a light-emitting lens group and a focusing lens group which are arranged on the same optical axis, and a light beam is emitted after sequentially passing through the focusing lens group and the light-emitting lens group; the focusing lens group at least comprises a focusing lens with positive focal power, and the light spot definition of different projection distances is adjusted by moving the focusing lens forwards / backwards on the same optical axis; the focal power of the light emitting lens group is positive; the light outgoing lens group sequentially comprises a fourth lens, a third lens, a second lens and a first lens from the light incoming side to the light outgoing side along the optical axis; the first lens is hermetically connected to the light outlet through a first sealing structure; the fourth lens is hermetically connected to the light inlet through a second sealing structure. The light-emitting lens group is composed of four lenses, air gaps are arranged among the lenses, and the front ends and the rear ends of the lenses are completely sealed, so that water vapor is not easy to enter the light-emitting lens group, water mist and oil mist are prevented from being generated, and the influence on light efficiency is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of lighting equipment technology, specifically relating to a high-definition and oil-fog-proof optical lens and its stage lighting fixture. Background Technology

[0002] In the field of lighting equipment technology, the sharpness of the light spot is a crucial indicator for evaluating lens performance. Specifically, the sharper the light spot projected by a beam lamp, the sharper the resulting beam, and consequently, the fuller and more layered the prismatic effect. Such beam lamps can present more precise, delicate, and visually impactful lighting effects in stage performances, film and television shooting, and various lighting applications, greatly improving the overall quality of lighting performance. However, in practical applications, the front lens of beam lamps often only has one lens element. For example, in the prior art, Chinese patent CN205447650U discloses a stage lighting effect sheet fixing device, in which only one lighting effect sheet is provided on the top of the base plate.

[0003] While this single-lens design simplifies the lamp's structure and reduces manufacturing costs to some extent, it also introduces a significant drawback: during prolonged operation, various impurities such as oil mist and moisture inside the lamp easily adhere to the single lens through heat exchange and airflow due to the high internal temperature. These impurities not only directly reduce the lens's light transmittance and cause light decay, but also blur the originally clear and sharp light spot, severely affecting the lighting effect.

[0004] Especially for stage lighting fixtures with higher power and higher operating temperatures, the increased internal heat and more significant temperature difference make them more susceptible to the accumulation of oil, moisture, and other impurities on the lenses. This not only increases the difficulty and frequency of fixture maintenance but also significantly limits their performance and stability in complex and ever-changing application scenarios. Summary of the Invention

[0005] To address the problems in related technologies, this utility model proposes a high-definition and oil-fog-proof optical lens and its stage lighting fixture, in order to overcome the aforementioned technical problems existing in the existing related technologies. The light-emitting lens assembly in this utility model consists of four lenses with air gaps between them. The front and rear ends of the light-emitting lens assembly are completely sealed, making it difficult for water vapor to enter the light-emitting lens assembly and avoiding the impact on light efficiency.

[0006] The technical solution of this utility model is as follows: a high-definition and oil-fog resistant optical lens includes an output lens group and a focusing lens group arranged on the same optical axis, and the light beam is emitted after passing through the focusing lens group and the output lens group in sequence.

[0007] The focusing lens group includes at least one focusing lens with positive optical power, and the sharpness of the light spot at different projection distances can be adjusted by moving the focusing lens forward / backward on the same optical axis;

[0008] The optical power of the light-emitting lens group is positive; the light-emitting lens group includes a fourth lens, a third lens, a second lens, and a first lens sequentially along the optical axis from the light-incident side to the light-emitting side; wherein, at least one side of the first lens is convex; one side of the second lens is convex and the other side is concave; at least one side of the third lens is convex; at least one side of the fourth lens is concave, and the third lens and the fourth lens are cemented together; the medium between the first lens and the second lens is air, and the medium between the second lens and the third lens is also air;

[0009] It also includes a lens assembly housing for fixing the light-emitting lens assembly, the lens assembly housing including a light inlet and a light outlet disposed opposite to each other; the first lens is sealed to the light outlet by a first sealing structure; the fourth lens is sealed to the light inlet by a second sealing structure.

[0010] The light beam enters from the concave surface of the fourth lens, passes through the third lens, the second lens, and the first lens in sequence, and exits from the convex surface of the first lens.

[0011] Furthermore, the beam angle emitted after passing through the focusing lens group and the light-emitting lens group is 1-3 degrees, and in practical applications, 2 degrees is preferred.

[0012] Furthermore, the first sealing structure includes a front fixing ring cover and a front sealing ring; a first step is formed on the inner wall of the light outlet, and the first lens is disposed on the first step; the front fixing ring cover is sealed to the edge of the convex surface of the first lens by the front sealing ring.

[0013] Furthermore, the third lens and the fourth lens are bonded together and then disposed at the light inlet. A limiting protrusion is provided on the inner wall of the light inlet, wherein the edge of the convex surface of the third lens abuts against the limiting protrusion. The second sealing structure includes a rear fixing ring cover and a rear sealing ring. The rear fixing ring cover is sealed to the edge of the concave surface of the fourth lens by the rear sealing ring.

[0014] Furthermore, one side of the third lens is convex and the other side is flat; one side of the fourth lens is concave and the other side is flat; the flat surface of the third lens and the flat surface of the fourth lens are bonded together, which helps to reduce axial chromatic aberration.

[0015] Furthermore, one side of the first lens is convex and the other side is concave; the absolute value of the curvature of the concave surface of the first lens is less than the absolute value of the curvature of the concave surface of the second lens.

[0016] Furthermore, the first lens, the second lens, and the third lens are all meniscus positive lenses and are all made of crown glass.

[0017] Furthermore, the fourth lens is a meniscus negative lens made of flint glass.

[0018] Furthermore, the focusing lens is a biconvex positive lens made of flint glass.

[0019] Furthermore, the outer shell of the lens assembly is narrowed into a trumpet shape from the light-emitting side to the light-receiving side; wherein, the diameter of the third lens is the same as the diameter of the fourth lens, the diameter of the three lenses is smaller than the diameter of the second lens, and the diameter of the second lens is smaller than the diameter of the first lens.

[0020] A stage lighting fixture includes a lamp body, wherein a light source is disposed within the lamp body;

[0021] The lamp body also has the aforementioned high-definition and oil-fog-proof optical lens; the light emitted by the light source passes through an imaging aperture, and then passes through a focusing lens group and a light-emitting lens group in sequence before exiting to the outside of the lamp body.

[0022] The beneficial effects of this utility model are:

[0023] (1) First, the light-emitting lens group in this utility model consists of four lenses with air gaps between them. The front and rear ends of the light-emitting lens group are completely sealed, so water vapor is not easy to enter the light-emitting lens group. This ensures that the first lens near the light outlet will not condense due to temperature difference and generate water vapor or oil mist, thereby avoiding the impact on light efficiency.

[0024] (2) Moreover, the combination of the light-emitting lens group and the focusing lens group in this utility model is beneficial to reduce the aberrations such as spherical aberration and coma of the optical lens, so that the light spot projected by the optical lens is clear and sharp, and the relative deviation of the brightness between the center and the edge of the beam is reduced, the beam is more uniform and full, and it can form a narrow angle of light, and has the characteristics of high brightness, strong penetration and long range. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a high-definition and oil-fog-resistant optical lens according to the present invention;

[0026] Figure 2 This is a cross-sectional view of a high-definition and oil-fog-resistant optical lens according to the present invention.

[0027] Figure 3 for Figure 2 Enlarged view of point A;

[0028] Figure 4 This is a schematic diagram of the light-emitting lens assembly of this utility model;

[0029] Figure 5 This is a partial structural diagram of a stage lighting fixture according to the present invention;

[0030] Figure 6 This is a partial structural cross-sectional view of a stage lighting fixture according to the present invention.

[0031] Marker explanation:

[0032] 1. Light-emitting lens assembly; 11. Lens assembly housing; 111. Limiting protrusion; 2. Focusing lens; 3. First lens; 4. Second lens; 5. Third lens; 6. Fourth lens; 7. First sealing structure; 71. Front fixing ring cover; 72. Front sealing ring; 8. First sealing structure; 81. Rear fixing ring cover; 82. Rear sealing ring; 9. Light source; 10. Imaging aperture. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0035] like Figure 1-2 As shown, this embodiment provides a high-definition and oil-fog-resistant optical lens, including an output lens group 1 and a focusing lens group disposed on the same optical axis. The light beam passes through the focusing lens group and the output lens group 1 in sequence before being emitted.

[0036] The focusing lens group includes at least one focusing lens 2 with positive optical power, and the sharpness of the light spot at different projection distances can be adjusted by moving the focusing lens 2 forward / backward on the same optical axis.

[0037] The optical power of the light-emitting lens group 1 is positive; the light-emitting lens group 1 includes, along the optical axis from the light-incident side to the light-emitting side, a fourth lens 6, a third lens 5, a second lens 4, and a first lens 3; wherein, at least one side of the first lens 3 is convex; one side of the second lens 4 is convex and the other side is concave; at least one side of the third lens 5 is convex; at least one side of the fourth lens 6 is concave, and the third lens 5 and the fourth lens 6 are cemented together; the medium between the first lens 3 and the second lens 4 is air, and the medium between the second lens 4 and the third lens 5 is also air;

[0038] like Figure 1 and Figure 4 As shown, it also includes a lens housing 11 for fixing the light-emitting lens group 1. The lens housing 11 includes a light inlet and a light outlet arranged opposite to each other. The first lens 3 is sealed to the light outlet through a first sealing structure 8. The fourth lens 6 is sealed to the light inlet through a second sealing structure.

[0039] The light beam enters from the concave surface of the fourth lens 6, passes through the third lens 5, the second lens 4, and the first lens 3 in sequence, and exits from the convex surface of the first lens 3.

[0040] First, the light-emitting lens group 1 in this embodiment consists of four lenses with air gaps between them. The front and rear ends of the light-emitting lens group 1 are completely sealed, making it difficult for water vapor to enter the light-emitting lens group 1. This ensures that the interior of the first lens 3 near the light outlet will not condense due to temperature changes, thus avoiding any impact on the light performance.

[0041] Moreover, the combination of the light-emitting lens group 1 and the focusing lens group in this embodiment helps to reduce aberrations such as spherical aberration and coma of the optical lens, making the light spot projected by the optical lens clear and sharp, and reducing the relative brightness deviation between the center and edge of the beam, resulting in a more uniform and full beam. It can form a narrow-angle light beam and has the characteristics of high brightness, strong penetration and long range.

[0042] Specifically, the beam angle after passing through the focusing lens group and the light-emitting lens group 1 is 1-3 degrees, thereby achieving narrow-angle light emission; in practical applications, 2 degrees is preferred.

[0043] Specifically, the first sealing structure 8 includes a front fixing ring cover 71 and a front sealing ring 72; a first step is formed on the inner wall of the light outlet, and the first lens 3 is disposed on the first step; the front fixing ring cover 71 is sealed to the edge of the convex surface of the first lens 3 by the front sealing ring 72.

[0044] In this embodiment, the first sealing structure 8 employs a combination design of a front fixing ring cover 71 and a front sealing ring 72. This dual sealing mechanism significantly enhances the sealing performance of the optical lens in critical areas, thereby avoiding the negative impact of contaminants on light transmission and image quality. Furthermore, the front sealing ring 72, as a component that directly contacts and tightly fits the convex edge of the first lens 3, ensures, through its elasticity and sealing material, that it effectively prevents the intrusion of external contaminants such as moisture and dust, even in minute gaps. In addition, the front fixing ring cover 71 tightly covers the convex edge of the first lens 3 via the front sealing ring 72, a structure that maintains a stable sealing effect during long-term use.

[0045] like Figure 2-3 As shown, the third lens 5 and the fourth lens 6 are glued together and disposed at the light inlet. A limiting protrusion 111 is provided on the inner wall of the light inlet, wherein the edge of the convex surface of the third lens 5 abuts against the limiting protrusion 111; the second sealing structure includes a rear fixing ring cover 81 and a rear sealing ring 82. The rear fixing ring cover 81 is sealed to the edge of the concave surface of the fourth lens 6 by the rear sealing ring 82.

[0046] It should be noted that by cementing the third lens 5 and the fourth lens 6 together and placing them as a whole at the light entrance, the gap between the lenses is effectively reduced. Furthermore, the cemented lens design not only improves sealing but also enhances the overall rigidity of the lens assembly, reducing performance fluctuations caused by vibration or impact. Secondly, the introduction of a second sealing structure consisting of a rear fixing ring cover 81 and a rear sealing ring 82 achieves a tight seal on the concave edge of the fourth lens 6, effectively preventing external moisture, dust, and other impurities from entering the optical system. Finally, the dual constraint of the limiting protrusion 111 and the rear fixing ring cover 81 ensures the positional stability of the cemented lens during long-term use, guaranteeing continuous stability of optical performance.

[0047] Specifically, one side of the third lens 5 is a convex surface for outputting light, and the other side is used for bonding with the fourth lens 6; one side of the fourth lens 6 is a concave surface for inputting light, and the other side is used for bonding with the third lens 5, which helps to reduce axial chromatic aberration.

[0048] It should be noted that after the fourth lens 6 and the third lens 5 are cemented together, the light-emitting side is designed as a convex surface and the light-receiving side is designed as a concave surface. This allows for better reception of light emitted from the focusing lens 2, with less light deflection and smoother dispersion into the air gap, which then disperses to the second lens 4, thus increasing the light flux.

[0049] Specifically, one side of the first lens 3 is convex, and the other side is concave;

[0050] The absolute value of the curvature of the concave surface of the first lens 3 is less than the absolute value of the curvature of the concave surface of the second lens 4;

[0051] It should be noted that the light-emitting side of both the first lens 3 and the second lens 4 is designed to be convex, while the light-incoming side is designed to be concave. This design allows the second lens 4 to first diverge the light, and then the first lens 3 can further diverge the light transmitted from the second lens 4, which helps to further increase the light flux and make the beam brighter.

[0052] Specifically, the first lens 3, the second lens 4, and the third lens 5 are all meniscus positive lenses and are all made of crown glass;

[0053] The meniscus lens design effectively corrects aberrations, particularly spherical and coma, thereby improving image sharpness and contrast. Furthermore, the specific shape of the meniscus lens facilitates light refraction and focusing within the lens, resulting in sharper images. Crown glass, a high-quality transparent material, has a low refractive index and high light transmittance, reducing light loss within the lens and improving light utilization.

[0054] Specifically, the fourth lens 6 is a meniscus negative lens made of flint glass.

[0055] Specifically, the focusing lens 2 is a biconvex positive lens made of flint glass;

[0056] In this embodiment, the design of the biconvex positive lens, with both sides being convex, effectively converges light, providing stronger converging ability and more precise focusing control. Furthermore, the use of flint glass, due to its high refractive index and low dispersion characteristics, allows the focusing lens 2 to maintain higher accuracy and a wider focusing range during focusing.

[0057] Specifically, the lens housing 11 is narrowed into a trumpet shape from the light-emitting side to the light-receiving side; wherein, the diameter of the third lens 5 is the same as the diameter of the fourth lens 6, the diameter of the three lenses is smaller than the diameter of the second lens 4, and the diameter of the second lens 4 is smaller than the diameter of the first lens 3.

[0058] In this embodiment, the lens housing 11 is designed to be narrowed into a trumpet shape from the light-emitting side to the light-incoming side, and combined with the layer-by-layer decreasing lens diameter design, so as to achieve the layer-by-layer divergence and optimization of light within the light-emitting lens group 1.

[0059] like Figure 5-6 As shown, this embodiment also provides a stage lighting fixture, including a lamp body, wherein a light source 9 is provided inside the lamp body;

[0060] The lamp body also has a high-definition and oil-fog-proof optical lens as described above; the light emitted by the light source 9 passes through an imaging hole 10, and then passes through a focusing lens group and a light-emitting lens group 1 in sequence before being emitted to the outside of the lamp body.

[0061] The light-emitting lens group 1 in the stage lighting fixture consists of four lenses with air gaps between them. The front and rear ends of the light-emitting lens group 1 are completely sealed, making it difficult for water vapor to enter the light-emitting lens group 1. The heat inside the stage lighting fixture cannot be directly transferred to the first lens 3. This ensures that the first lens 3, which is close to the light outlet, will not condense and produce water vapor or oil mist due to temperature differences, thereby avoiding the impact on the light efficiency.

[0062] Moreover, the stage lighting fixture combines the light-emitting lens group 1 with the focusing lens group, which helps to reduce aberrations such as spherical aberration and coma of the optical lens, making the light spot projected by the optical lens clear and sharp, and reducing the relative brightness deviation between the center and edge of the beam. The beam of the stage lighting fixture is also more uniform and full, which can form a narrow-angle light and has the characteristics of high brightness, strong penetration and long range.

[0063] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A high-definition, oil-fogging-resistant optical lens, comprising an output lens group and a focusing lens group disposed on the same optical axis, wherein the light beam passes sequentially through the focusing lens group and the output lens group before exiting, characterized in that: The focusing lens group includes at least one focusing lens with positive optical power, and the sharpness of the light spot at different projection distances can be adjusted by moving the focusing lens forward / backward on the same optical axis; The optical power of the light-emitting lens group is positive; the light-emitting lens group includes a fourth lens, a third lens, a second lens, and a first lens sequentially along the optical axis from the light-incident side to the light-emitting side; wherein, at least one side of the first lens is convex; one side of the second lens is convex and the other side is concave; at least one side of the third lens is convex; at least one side of the fourth lens is concave, and the third lens and the fourth lens are cemented together; the medium between the first lens and the second lens is air, and the medium between the second lens and the third lens is also air; It also includes a lens assembly housing for fixing the light-emitting lens assembly, the lens assembly housing including a light inlet and a light outlet disposed opposite to each other; the first lens is sealed to the light outlet by a first sealing structure; the fourth lens is sealed to the light inlet by a second sealing structure. The light beam enters from the concave surface of the fourth lens, passes through the third lens, the second lens, and the first lens in sequence, and exits from the convex surface of the first lens.

2. The high-definition and oil-fogging resistant optical lens according to claim 1, characterized in that, The first sealing structure includes a front fixing ring cover and a front sealing ring; a first step is formed on the inner wall of the light outlet, and the first lens is disposed on the first step; the front fixing ring cover is sealed to the edge of the convex surface of the first lens by the front sealing ring.

3. The high-definition and oil-fogging resistant optical lens according to claim 1, characterized in that, The third lens and the fourth lens are bonded together and then disposed at the light inlet. A limiting protrusion is provided on the inner wall of the light inlet, wherein the edge of the convex surface of the third lens abuts against the limiting protrusion. The second sealing structure includes a rear fixing ring cover and a rear sealing ring. The rear fixing ring cover is sealed to the edge of the concave surface of the fourth lens by the rear sealing ring.

4. The high-definition and oil-fogging resistant optical lens according to claim 1, characterized in that, One side of the third lens is convex and the other side is flat; one side of the fourth lens is concave and the other side is flat; the flat surface of the third lens and the flat surface of the fourth lens are glued together.

5. A high-definition and oil-fogging resistant optical lens according to claim 1, characterized in that, One side of the first lens is convex, and the other side is concave; the absolute value of the curvature of the concave surface of the first lens is less than the absolute value of the curvature of the concave surface of the second lens.

6. A high-definition and oil-fogging resistant optical lens according to claim 1, characterized in that, The first lens, the second lens, and the third lens are all meniscus positive lenses and are all made of crown glass.

7. A high-definition and oil-fogging resistant optical lens according to claim 1, characterized in that, The fourth lens is a meniscus negative lens made of flint glass.

8. A high-definition and oil-fogging resistant optical lens according to claim 1, characterized in that, The focusing lens is a biconvex positive lens made of flint glass.

9. A high-definition and oil-fogging resistant optical lens according to claim 1, characterized in that, The outer shell of the lens assembly is narrowed into a trumpet shape from the light-emitting side to the light-receiving side; wherein, the diameter of the third lens is the same as the diameter of the fourth lens, the diameter of the three lenses is smaller than the diameter of the second lens, and the diameter of the second lens is smaller than the diameter of the first lens.

10. A stage lighting fixture, comprising a lamp body, wherein a light source is disposed within the lamp body; characterized in that, The lamp body also has a high-definition and oil-fog-proof optical lens as described in any one of claims 1-9; the light emitted by the light source passes through an imaging aperture, and then passes through a focusing lens group and a light-emitting lens group in sequence before exiting to the outside of the lamp body.

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