Vehicle-mounted aspheric wide-angle lens

Abstract

The application relates to the technical field of vehicle-mounted lenses, and discloses a vehicle-mounted aspheric wide-angle lens, which is provided with a main lens assembly, a diaphragm and a sub-lens assembly from an object plane to an image plane, the main lens assembly is composed of a first lens, a second lens, a third lens, a fourth lens and a fifth lens, the sub-lens assembly is composed of a sixth lens and a seventh lens, the first lens is provided with a plane mirror at both ends and a biconvex lens on the inner side, the second lens is provided with a biconcave lens on the inner side, the left side of the third lens is provided with an outward convex lens, the fourth lens is provided with a biconcave lens on both sides, the fifth lens is provided with outward convex optical glass lenses on both sides, and the right side of the main lens assembly is provided with a diaphragm, the vehicle-mounted aspheric wide-angle lens is cooperative with the diaphragm and the lens assembly, the diaphragm automatically adjusts light according to light intensity, exposure problems are avoided, the lens is made of super-low dispersion glass with an Abbe number greater than 55, dispersion is reduced, and a light-transmitting film is used to increase the light transmittance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle-mounted lenses, in particular to a vehicle-mounted aspheric wide-angle lens. BACKGROUND

[0002] In the modern transportation system, the safety of vehicle driving is of great importance, and the vehicle-mounted vision system as the key way for drivers to obtain external information, its core component vehicle-mounted lens plays an indispensable role, the vehicle-mounted lens aims to provide clear and wide view for the driver, helping the driver accurately perceive the environment around the vehicle, including road conditions, traffic signs and other vehicles and pedestrians, etc., with the continuous growth of the number of cars and the increasing complexity of road environment, the performance requirements of vehicle-mounted lenses are becoming more and more demanding, drivers need to clearly observe the surrounding conditions in various light conditions, such as strong light direct radiation in sunny days, dim lighting at night and light mutation environment when entering and leaving the tunnel, at the same time, in order to cope with complex and changeable road conditions, wide field of view is also essential, therefore, it is urgent to develop a vehicle-mounted aspheric wide-angle lens with high definition, good light adaptability and wide field of view, which is of great significance to improve driving safety and reduce traffic accidents.

[0003] However, the traditional vehicle-mounted lens technology has many drawbacks, in terms of imaging clarity, the traditional lens cannot effectively solve the problem of light dispersion, different wavelengths of light focus inconsistently in the refraction process, resulting in chromatic aberration in imaging, with colored stripes on the image edge, which seriously affects the driver's accurate identification of traffic sign colors and details, increasing the potential safety risk, in terms of light adaptability, the traditional lens cannot automatically adjust according to the intensity of environmental light, which is easy to overexpose in strong light, making the image white and losing a lot of details; in weak light, the image is dark and blurred due to insufficient light, making it difficult for the driver to see the road conditions, in addition, the field of view of the traditional lens is relatively narrow, the driver needs to frequently turn his head to observe the surrounding environment, which distracts the attention from the road ahead, which is also not conducive to safe driving, moreover, the traditional lens performs poorly in durability and stability, slight scratches or vibrations during vehicle driving can cause the optical performance of the lens to decline, resulting in blurred imaging, which not only affects the user experience, but also increases the use cost due to frequent replacement of the lens, in order to solve the above problems, we propose a vehicle-mounted aspheric wide-angle lens. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a vehicle-mounted aspheric wide-angle lens, which solves the above problems.

[0005] In order to achieve the above-mentioned purpose, the application provides the following technical scheme: a vehicle-mounted aspherical wide-angle lens, which is provided with a main lens assembly, a diaphragm and a sub-lens assembly from an object plane to an image plane, respectively, wherein the main lens assembly comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens, and the sub-lens assembly comprises a sixth lens and a seventh lens; the first lens is a plane mirror at both ends and a biconvex lens at the inner side; the second lens is a biconcave lens inwardly recessed at the inner side; the left side of the third lens is an outward convex lens; the fourth lens is a biconcave lens inwardly recessed at both sides; the fifth lens is an optical glass lens outwardly convex at both sides; and the right side of the main lens assembly is provided with the diaphragm.

[0006] Preferably, the sub-lens assembly comprises the sixth lens and the seventh lens, respectively; the left side of the sixth lens is a single concave lens inwardly recessed; and the right side of the sixth lens is a single convex lens outwardly convex.

[0007] Preferably, the right side single convex lens arc of the first lens is matched with the left side single concave lens arc of the second lens.

[0008] Preferably, the right side single concave lens arc of the second lens is matched with the left side single convex lens arc of the third lens.

[0009] Preferably, the first lens, the second lens and the third lens are matched with each other, and the outer side of the first lens is a circular structure.

[0010] Preferably, a layer of anti-reflection film is arranged between the fourth lens and the fifth lens, the anti-reflection film is made of magnesium fluoride, the thickness of the anti-reflection film is accurately calculated to be 80-100 nanometers, the anti-reflection film can effectively reduce the reflection loss of light between the two lenses, the light transmittance is increased to more than 98%, and the imaging brightness and the imaging clarity of the whole lens system are improved.

[0011] Preferably, the right side surface of the seventh lens has an anti-scratch wear-resistant coating, the coating is formed by a physical vapor deposition process of DLC, the hardness of the coating is more than 10-12H, the coating can effectively resist scratches that may occur in daily use, prolong the service life of the lens, ensure that the optical performance is not affected, and maintain the stability of the imaging quality.

[0012] Preferably, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all made of super low dispersion optical glass, the Abbe number of the glass is greater than 55, the light dispersion phenomenon can be effectively reduced, the imaging color is more real and accurate, the influence of chromatic aberration on the imaging quality is reduced, and the requirements for high definition and color restoration degree in a vehicle-mounted environment are met.

[0013] Compared with the prior art, the present application provides a vehicle-mounted aspheric wide-angle lens, which has the following beneficial effects:

[0014] 1、The vehicle-mounted aspheric wide-angle lens effectively solves this problem through the synergistic effect of the diaphragm and the lens assembly. The diaphragm can automatically adjust the aperture size according to the intensity of ambient light. In strong light, the aperture is reduced to avoid excessive exposure and ensure clear image details. In weak light, the aperture is increased to ensure sufficient light intake and maintain image brightness. At the same time, each lens is made of ultra-low dispersion optical glass with an Abbe number greater than 55, effectively reducing light dispersion and making the image color real and accurate. In addition, the anti-reflection film between the fourth lens 4 and the fifth lens 5 is made of magnesium fluoride, with a thickness precisely controlled at 80-100 nanometers, which can increase the light transmittance to more than 98%, reduce light reflection loss, and enhance image brightness and clarity. Compared with traditional lenses, this lens can quickly adapt to changes in light, whether in the daytime under the scorching sun, in the evening with poor lighting, or when driving through areas with sudden changes in light such as tunnels, providing drivers with clear, bright, and color-accurate visual images at all times, helping drivers make accurate judgments and improving driving safety.

[0015] 2、All lenses of the lens are made of ultra-low dispersion optical glass with an Abbe number greater than 55, effectively reducing light dispersion and allowing light of different wavelengths to focus on the same image point as much as possible, making the image color real and accurate. At the same time, the lenses work together, such as the primary lens assembly that preliminarily converges, adjusts, and corrects aberrations, and the secondary lens assembly that optimizes the image, further improving the image clarity. In actual driving, traditional lenses may make it difficult for drivers to accurately distinguish the color and details of traffic signs, while this lens can provide drivers with clear and realistic visual images, significantly improving the recognition of road environments in both strong sunlight and weak light at night, greatly enhancing driving safety.

[0016] 3、The vehicle-mounted aspheric wide-angle lens performs well in durability and stability. The right surface of the seventh lens has a scratch-resistant and wear-resistant coating formed by a DLC physical vapor deposition process, with a hardness of 10-12H or higher, which can effectively resist scratches that may occur during daily use and prolong the service life of the lens. At the same time, the overall structure of the lens is reasonably designed, and the lenses are adapted to each other, such as the close cooperation of the first lens, the second lens, and the third lens, ensuring that the optical performance remains good and the imaging quality remains stable even under conditions such as vibration during vehicle driving. Traditional lenses may have blurred images due to slight vibration or scratches, but this lens provides more reliable and stable visual protection for drivers, reducing the frequency of replacement due to decreased lens performance, and reducing the cost of use. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1Structure diagram of the present application;

[0018] Figure 2 MTF diagram of the present application;

[0019] Figure 3 15° defocus curve diagram of the present application;

[0020] Figure 4 -30° defocus curve diagram of the present application.

[0021] In the figure: 1, first lens; 2, second lens; 3, third lens; 4, fourth lens; 5, fifth lens; 6, diaphragm; 7, sixth lens; 8, seventh lens. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0023] Please refer to Figures 1-4 A vehicle-mounted aspheric wide-angle lens, characterized in that: a main lens assembly, a diaphragm and a sub-lens assembly are respectively arranged from an object plane to an image plane, the main lens assembly comprises a first lens 1, a second lens 2, a third lens 3, a fourth lens 4 and a fifth lens 5, the sub-lens assembly comprises a sixth lens 7 and a seventh lens 8, both ends of the first lens 1 are plane mirrors, and the inner side is a double-convex lens, the inner side of the second lens 2 is a double-concave lens inwardly recessed, the left side of the third lens 3 is an outward convex lens, both sides of the fourth lens 4 are double-concave lenses inwardly recessed, both sides of the fifth lens 5 are outward convex optical glass lenses, and the right side of the main lens assembly is provided with a diaphragm 6.

[0024] Further, the sub-lens assembly respectively comprises a sixth lens 7 and a seventh lens 8, the left side of the sixth lens 7 is a single concave lens concave inward, the right side of the sixth lens 7 is a single convex lens convex outward, the left side of the seventh lens 8 is a single concave lens concave inward, in the sub-lens assembly, the sixth lens 7 and the seventh lens 8 closely link to optimize the light twice, greatly improve the imaging quality, after the light is preliminarily processed by the main lens assembly and the diaphragm, it first contacts the sixth lens 7 in the sub-lens assembly, the left single concave lens of the sixth lens 7 moderately diverges the light, adjusts the light propagation angle, prepares for the re-converging of the right single convex lens, the right single convex lens re-converges the diverged light, makes the light distribution more concentrated and uniform, then the light reaches the seventh lens 8, the left single concave lens of the seventh lens 8 makes the last slight divergence adjustment to the light, this process further uniformly distributes the light and corrects the possible residual aberration, ensures that the light is accurately focused on the image plane, in the actual vehicle-mounted scene, whether it is near-view observation under complex road conditions or long-distance identification of signs, the image seen by the driver is more clear, sharp and has higher color restoration, which effectively assists the driver to accurately judge the surrounding environment and provides reliable visual support for safe driving.

[0025] Further, the right single convex lens curvature of the first lens 1 is matched with the left single concave lens curvature of the second lens 2, the right single convex lens curvature of the first lens 1 is matched with the left single concave lens curvature of the second lens 2, which is the core linkage point for smooth propagation and accurate adjustment of the light in the main lens assembly, when the light converges from the first lens 1, with this accurate curvature matching, the light smoothly transitions to the second lens 2 like a relay, ensuring seamless connection of light propagation, allowing the double concave lens structure of the second lens 2 to smoothly diverge the preliminarily converged light, this design is crucial, it prevents excessive convergence of light, ensures uniform distribution of light in the subsequent propagation process, creates good conditions for further processing of light by subsequent lenses, ensures imaging clarity and uniformity in different lighting environments, avoids distortion or blur of the image caused by improper light adjustment, always provides stable and clear visual information for the driver, and helps them to drive safely in various environments.

[0026] Further, the right side single concave lens of the second lens 2 and the left side single convex lens of the third lens 3 are radially matched, the right side single concave lens of the second lens 2 and the left side single convex lens of the third lens 3 are radially matched, which builds a key linkage link of light convergence and correction in the main lens assembly, the light smoothly transitions from the second lens 2 to the third lens 3, and the left side convex lens of the third lens 3 converges the light again by the matched radian, and such linkage not only further enhances the convergence degree of the light, but also corrects the deviation that may occur in the light propagation, the first lens 1, the second lens 2 and the third lens 3 are matched with each other, forming a high-efficiency light processing unit, which ensures that the light can be accurately processed in the complex and changeable vehicle-mounted visual environment.

[0027] Further, the first lens 1, the second lens 2 and the third lens 3 are matched with each other, and the outer side of the first lens 1 is a circular structure, the first lens 1, the second lens 2 and the third lens 3 are matched with each other, and the outer side of the first lens 1 is a circular structure, the circular structure of the outer side of the first lens 1 is convenient for accurate positioning during installation, ensuring that the relative positions among the three lenses are accurate and accurate, laying a solid foundation for the orderly propagation of light, the three lenses are matched with each other, the first lens 1 is responsible for the preliminary convergence of light, the second lens 2 is adjusted by moderate divergence, and the third lens 3 converges and corrects the light again, which cooperates like a closely coordinated team, gradually optimizes the light, and such linkage significantly improves the convergence and preliminary adjustment efficiency of the main lens assembly to the light, so that the light has a solid foundation for clear imaging under the action of the lens.

[0028] Further, a layer of anti-reflection film is arranged between the fourth lens 4 and the fifth lens 5, the anti-reflection film is made of magnesium fluoride, and the thickness is accurately calculated to be 80-100 nanometers, which can effectively reduce the reflection loss of light between the two lenses, and the light transmittance is increased to more than 98%, thereby improving the imaging brightness and clarity of the whole lens system, the anti-reflection film of magnesium fluoride between the fourth lens 4 and the fifth lens 5 has a thickness of 80-100 nanometers, which is closely linked with the two lenses, and greatly improves the imaging quality, when the light propagates to the fifth lens 5 after being corrected by the fourth lens 4, the anti-reflection film plays a key role, which, according to the interference principle, reduces the reflection loss of light between the two lenses by accurately designing the thickness, the refractive index of the anti-reflection film is between air and lens material, which skillfully controls the reflection and transmission of light, the light transmittance is increased to more than 98%, and the imaging brightness and clarity of the whole lens system are significantly enhanced.

[0029] Further, the right side surface of the seventh lens 8 has an anti-scratch wear-resistant coating formed by a physical vapor deposition process of DLC, with a hardness of 10-12H or more, which can effectively resist scratches that may occur in daily use, prolong the service life of the lens, and at the same time ensure that its optical performance is not affected, maintaining the stability of the imaging quality. The anti-scratch wear-resistant coating on the right side surface of the seventh lens 8 formed by the physical vapor deposition process of DLC has a hardness of 10-12H or more, which is an important linkage for maintaining the performance of the seventh lens 8. In daily use, the driving environment of the vehicle is complex, and the coating acts as a strong shield to effectively resist scratches that may occur, protecting the surface integrity of the seventh lens 8. At the same time, the coating does not affect the optical performance of the seventh lens 8, ensuring that its subtle adjustment and focusing function on light are not disturbed. Even after long-term use, the coating can still maintain the stability of the imaging quality, prolong the service life of the lens, reduce the replacement cost due to lens damage, and ensure the reliability of the visual system during driving.

[0030] Further, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 7, and the seventh lens 8 are all made of ultra-low dispersion optical glass with an Abbe number greater than 55, which can effectively reduce the dispersion of light, making the imaging color more true and accurate, reducing the impact of chromatic aberration on imaging quality, and meeting the requirements of high definition and color restoration in a vehicle-mounted environment. The first lens 1 to the seventh lens 8 are all made of ultra-low dispersion optical glass with an Abbe number greater than 55. The ultra-low dispersion optical glass used in the lenses can effectively reduce the dispersion of light, making the imaging color more true and accurate, reducing the impact of chromatic aberration on imaging quality. In a vehicle-mounted environment, the driver can see clearer and more realistic visual images, whether it is to distinguish the color of traffic signal lights or to identify the color identification of road facilities, it is more accurate, which helps the driver to make accurate driving decisions and improves driving safety and reliability.

[0031] Usage instructions:

[0032] When the light rays from the vehicle-mounted aspheric wide-angle lens to the object plane, first contact the first lens 1 in the main lens assembly, the two end plane mirror of the first lens 1 ensures that the light rays enter the inside biconvex lens in a relatively parallel state, the two convex arc of the biconvex lens is carefully designed, according to the principle of optical refraction, the light rays are focused from different directions, laying the foundation for subsequent lens processing, after the light rays are converged by the first lens 1, they enter the second lens 2, because the right side of the first lens 1 single convex lens arc and the left side of the second lens 2 single concave lens arc are accurately matched, the light rays can smoothly transition to the second lens 2, the double concave lens structure of the second lens 2 begins to play a role, and the light rays are moderately dispersed, this design is to avoid excessive convergence of light rays, ensure that the light rays can be evenly distributed in the subsequent propagation process, and at the same time, the propagation angle of the light rays is adjusted, so that the light rays are more in line with the imaging requirements of the entire lens system, then, the light rays reach the third lens 3, the right side of the second lens 2 single concave lens and the left side of the third lens 3 single convex lens arc are also matched, the light rays smoothly enter the third lens 3, the left side of the third lens 3 convex lens converges the light rays again, through the accurate curvature design, the convergence degree of the light rays is further enhanced, and the deviation that may occur in the light rays during propagation is corrected, the first lens 1, the second lens 2 and the third lens 3 are matched and closely cooperate to form an efficient light convergence and preliminary adjustment unit, so that the light rays have a clear imaging basis under the action of the first three lenses, although the light rays have been preliminarily converged and adjusted after being processed by the first three lenses, there may still be aberrations such as spherical aberration and coma, the double concave lens structure of the fourth lens 4 plays a key role at this time, the inwardly recessed design of its two sides can further disperse and adjust the light rays, evenly distribute the light rays, and effectively correct the aberrations, by accurately controlling the curvature and material properties of the double concave lens, the fourth lens 4 makes slight adjustments to the propagation direction of the light rays, so that the light rays are more parallel and uniform, providing better light conditions for subsequent imaging, after the light rays are corrected by the fourth lens 4, they enter the fifth lens 5, the two sides of the fifth lens 5 convex optical glass lens converges the light rays, the carefully designed curvature can accurately focus the light rays processed by the previous lenses in a small area, greatly improving the clarity and brightness of the image, in addition, the glass material of the fifth lens 5 has high transparency and good optical stability, effectively reducing the reflection and scattering of light in the lens, and the surface of the fifth lens 5 is finely polished and coated, further reducing light reflection loss and improving light transmittance, ensuring high quality of the final image.After the light passes through the main lens assembly, it reaches the diaphragm 6, the aperture size of which directly affects the amount of light passing through the lens. In different light environments, the diaphragm 6 plays a crucial role in adjustment. In strong light environments and when the light intensity is greater than 5000 lux, the diaphragm aperture is reduced to 2-3 millimeters, limiting the amount of light entering to avoid overexposure of the image and ensuring that the image details are clear and distinguishable. In weak light environments and when the light intensity is less than 50 lux, the diaphragm aperture is increased to 8-10 millimeters to ensure that enough light enters, so that the image does not become dark and blurred due to insufficient light, maintaining the brightness and clarity of the image. The diaphragm 6 not only controls the amount of light but also affects the depth of field and resolution of the image. A smaller diaphragm aperture can increase the depth of field, allowing distant and near objects to be relatively clearly imaged. A larger diaphragm aperture can help improve resolution, making the image more sharp. After the light is adjusted by the diaphragm 6, it enters the secondary lens assembly. First, it contacts the sixth lens 7, whose left single concave lens moderately diverges the light, adjusting the light propagation angle for the right single convex lens to re-converge. The right single convex lens of the sixth lens 7 re-converges the light diverged by the left single concave lens. Through this process of first divergence and then convergence, the distribution and focusing effect of the light are further optimized, making the light more concentrated and uniform. Finally, the light reaches the seventh lens 8. The left single concave lens of the seventh lens 8 makes a final slight divergence adjustment to the light, further uniforming the light distribution and correcting possible residual aberrations, so that the light is more accurately focused on the image plane. The right surface of the seventh lens 8 has an anti-scratch and wear-resistant coating formed by DLC through physical vapor deposition process, with a hardness of 10-12H or above. It not only effectively resists scratches during daily use, prolonging the service life of the lens, but also ensures that its optical performance is not affected, maintaining the stability of the imaging quality. The anti-reflection film between the fourth lens 4 and the fifth lens 5 is made of magnesium fluoride, with a thickness accurately controlled at 80-100 nanometers. This anti-reflection film has a very significant effect. It can effectively reduce the reflection loss of light between the two lenses. During light propagation, when light enters from one medium to another, reflection inevitably occurs. The presence of the anti-reflection film can cancel out the reflected light through interference principles, thereby greatly improving the transmittance of light. Specifically, the refractive index of the magnesium fluoride anti-reflection film is between that of air and the lens material. When light is incident on the surface of the anti-reflection film, part of the light is reflected at the anti-reflection film-air interface, and another part of the light enters the anti-reflection film and is reflected at the anti-reflection film-lens interface. By accurately controlling the thickness of the anti-reflection film, the optical path difference of the two reflected lights satisfies the interference cancellation condition, thereby reducing the intensity of reflected light and increasing the intensity of transmitted light. In the vehicle-mounted aspherical wide-angle lens, the anti-reflection film increases the light transmittance to more than 98%, greatly improving the brightness and clarity of the entire lens system, ensuring that the driver can have a bright and clear view in various light conditions.The first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 7 and the seventh lens 8 are all made of ultra-low dispersion optical glass, the Abbe number of which is greater than 55, the Abbe number is an important index to measure the dispersion degree of optical material, the greater the Abbe number, the smaller the dispersion of the material, in traditional optical glass, different wavelengths of light will produce different degrees of deflection in the process of refraction, resulting in color difference in imaging, that is, color stripes appear on the edge of the image, which affects the imaging quality, while the ultra-low dispersion optical glass can effectively reduce the light dispersion phenomenon, so that different wavelengths of light can be focused on the same image point as much as possible after refraction through the lens, so that the imaging color is more real and accurate, and the influence of color difference on the imaging quality is reduced, in the vehicle-mounted environment, it can provide clearer and more realistic visual images for the driver, which helps to accurately judge the road conditions and the surrounding environment.

[0033] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, the scope of the present application being defined by the appended claims and their equivalents.

Claims

1. A vehicle-mounted aspherical wide-angle lens, characterized by: The main lens assembly includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4 and a fifth lens 5, and the auxiliary lens assembly includes a sixth lens 7 and a seventh lens 8.

2. The aspherical wide-angle lens for vehicle according to claim 1, wherein: The sixth lens 7 left side is a single concave lens, the sixth lens 7 right side is a single convex lens, and the seventh lens 8 left side is a single concave lens.

3. The aspherical wide-angle lens for vehicle according to claim 1, wherein: The first lens 1 right side single convex lens curvature and the second lens 2 left side single concave lens curvature are matched.

4. The aspherical wide-angle lens for vehicle according to claim 1, wherein: The second lens 2 right side single concave lens and the third lens 3 left side single convex lens curvature are matched.

5. The aspherical wide-angle lens for vehicle according to claim 1, wherein: The first lens 1, the second lens 2 and the third lens 3 are matched with each other, and the first lens 1 outside flat place is a circular structure.

6. The aspherical wide-angle lens for vehicle according to claim 2, wherein: The fourth lens 4 and the fifth lens 5 are provided with a layer of anti-reflection film, the anti-reflection film is made of magnesium fluoride, the thickness is 80-100 nanometers, and the light transmittance is increased to more than 98%.

7. The aspherical wide-angle lens for vehicle according to claim 1, wherein: The seventh lens 8 right side surface has a scratch-resistant and wear-resistant coating, the coating is formed by a physical vapor deposition process of DLC, and the hardness reaches 10-12H.

Images