Lens and headlight

Abstract

The present invention discloses a lens and a headlamp. The lens is flat and longitudinal; the two end faces of the lens in the longitudinal direction are the left side face and the right side face, the two faces of the lens in the flat direction opposite to each other are the light incident face and the light emitting face, the two side faces of the lens in the longitudinal direction sandwiched between the light incident face and the light emitting face are the upper side face and the lower side face, the light incident face is concave relative to the center direction of the lens, the light emitting face is convex relative to the center direction of the lens, and the light spot of the light emitted by the lens is in the shape of a human eye. The present invention solves the problems of discomfort for users of headlamps and low light utilization rate of headlamps in the prior art; it ensures that the light spot of the light emitted by the lens is in the shape of a "human eye", which conforms to the overlapping visual angle of people's two eyes, meets people's visual needs, improves the user's comfort feeling during use, and improves the utilization rate of light.

Description

Technical Field

[0001] The present invention relates to the field of lighting technology, and in particular to a lens and a headlamp. Background Art

[0002] There are two types of existing headlights: spotlight headlights and floodlights. For spotlight headlights, the brightness is higher in the area where the light is illuminated, but it is very dark outside the area where the light is illuminated, with almost no light. This makes the user feel very uncomfortable and does not conform to people's daily eye viewing habits. The light and dark contrast of floodlight headlights is not too strong, but the illumination range exceeds the visual range of the human eye, and the focus of the illuminated area is not prominent, that is, the illumination of the center and the area near the edge is not much different, and the light utilization rate of floodlight headlights is also very low.

[0003] The brightness of the light in the headlight and the contrast between light and dark within the illumination range depend on the design of the lens.

[0004] With regard to the problems of discomfort to users of headlamps and low light utilization rate of headlamps in the prior art, no effective solution has been proposed so far. Summary of the invention

[0005] The embodiments of the present invention provide a lens and a headlamp to solve the problems in the prior art that the user of the headlamp is uncomfortable when using the headlamp and the headlamp light utilization rate is low.

[0006] To achieve the above-mentioned purpose, on the one hand, the present invention provides a lens, which is flat and elongated; the two end surfaces of the lens in the longitudinal direction are the left side surface and the right side surface, the two opposite surfaces of the lens in the flat direction are the light entrance surface and the light exit surface, the two side surfaces of the lens in the longitudinal direction sandwiched between the light entrance surface and the light exit surface are the upper side surface and the lower side surface, the light entrance surface is concave relative to the center direction of the lens, the light exit surface is convex relative to the center direction of the lens, and the light spot of the light emitted by the lens is shaped like a human eye.

[0007] Optional,

[0008] A fixing portion is extended from the junction of the upper side surface and the lower side surface of the lens with the light emitting surface, and the fixing portion is used to fix and clamp the lens in the lamp.

[0009] Optionally, in the cross section of the lens in the longitudinal direction,

[0010] The arc radius of the light emitting surface is 8-10 mm, and the included angle is 120°-130°;

[0011] The arc radius of the light incident surface is 12-18 mm, and the included angle is 25°-35°;

[0012] The light emitting surface and the light incident surface are both centrally symmetrically arranged and have the same central symmetry axis. The distance between the center of the arc of the light emitting surface and the center of the arc of the light incident surface on the central symmetry axis is 13-16 mm.

[0013] Optional,

[0014] The upper side and the lower side of the lens are straight surfaces; or

[0015] The upper side surface and the lower side surface of the lens are free-form surfaces; the free-form surfaces are adjusted based on a straight surface and a plurality of adjustment points;

[0016] There are multiple adjustment points, and relative to the light incident surface and the light exit surface, most of the adjustment points are closer to the light incident surface, and the adjustment distance is less than 0.1 mm.

[0017] Optional,

[0018] The left side and the right side of the lens are straight surfaces; or

[0019] The left side surface and the right side surface of the lens are spherical surfaces, and the spherical surfaces are obtained by a rotation excision method;

[0020] The rotational excision method assumes that the lens is an infinitely long body before excision, and the lens is placed horizontally, with the light-emitting surface located on the upper side of the light-entering surface. The center connecting line of the two planes is used as the vertical axis, the straight line perpendicular to the midpoint of the center connecting line and along the longitudinal direction of the lens is used as the horizontal axis, and a sphere is drawn with any point on the plane formed by the horizontal axis and the vertical axis as the center of the sphere. The sphere excises the infinitely long body to obtain the lens; the radius of the sphere is 10-15 mm, and the angle between the line connecting the upper and lower vertices of the two side surfaces after excision and the vertical axis is 25°-30°.

[0021] Optional,

[0022] Two edges of the light incident surface of the lens in the longitudinal direction are straight surfaces.

[0023] Optional,

[0024] The lens is made of PC material.

[0025] In another aspect, the present invention provides a headlamp using the lens as described above.

[0026] Optional,

[0027] The headlamp comprises a shell having an opening, and the light emitting surface of the lens is directly exposed to the air from the opening of the shell; the headlamp further comprises a light source, and the distance between the light source and the light incident surface of the lens is 0.8-1.5 mm.

[0028] Optional,

[0029] The headlamp has a sensing device, and when it senses that a person's hand is waving twice, the headlamp is controlled to be turned off or on; the time interval between the two wavings of the person's hand is 0.1-0.6 seconds.

[0030] Beneficial effects of the present invention:

[0031] The embodiment of the present invention provides a lens and a headlamp, wherein the lens is flat and longitudinal; the two end surfaces of the lens in the longitudinal direction are the left side surface and the right side surface, the two opposite surfaces of the lens in the flat direction are the light-entering surface and the light-emitting surface, the two side surfaces of the lens in the longitudinal direction sandwiched between the light-entering surface and the light-emitting surface are the upper side surface and the lower side surface, the light-entering surface is concave relative to the center direction of the lens, and the light-emitting surface is convex relative to the center direction of the lens. Through this design, it is ensured that the light spot of the light emitted by the lens is in the shape of a "human eye", which conforms to the overlapping visual angle of people's two eyes, meets people's visual needs, and improves the user's comfort when using it. By designing and installing a headlamp with the lens as described above, and arranging a sensing device in the headlamp, the headlamp can be turned on and off by waving the hand twice, which is convenient for the user to operate, saves working time, and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of a lens according to an embodiment of the present invention;

[0033] Figure 2 is a schematic structural diagram of a cross section according to an embodiment of the present invention;

[0034] Figure 3 4 is a schematic diagram of the front structure of a lens according to an embodiment of the present invention.

[0035] Explanation of symbols:

[0036] Light incident surface-1, light emitting surface-2, fixing portion-3, upper side surface-4, lower side surface-5, left side surface-6, right side surface-7. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] There are two types of existing headlights: spotlights and floodlights. For spotlights, the brightness is high in the area where the light is illuminated, but it is very dark outside the area, which makes the user feel uncomfortable. The contrast between light and dark in floodlights is not too strong, but the utilization rate of light is also very low. The brightness and darkness of the light in the headlight and the contrast between light and dark in the area of ​​illumination depend on the design of the lens.

[0039] Therefore, the present invention designs a lens that can emit a light spot in the shape of a "human eye". Figure 1 is a schematic diagram of the structure of a lens according to an embodiment of the present invention. Figure 1 As shown, the lens is flat and elongated; the two end surfaces of the lens in the longitudinal direction are the left side surface 6 and the right side surface 7, the two opposite surfaces of the lens in the flat direction are the light entrance surface 1 and the light exit surface 2, the two side surfaces of the lens in the longitudinal direction sandwiched between the light entrance surface 1 and the light exit surface 2 are the upper side surface 4 and the lower side surface 5, the light entrance surface 1 is concave relative to the center direction of the lens, the light exit surface 2 is convex relative to the center direction of the lens, and the light spot of the light emitted by the lens is in the shape of a human eye.

[0040] like Figure 1 As shown, the lens is flat and elongated, and is used to gather light from a light source and disperse the light onto an irradiated surface; specifically, the lens is a polyhedron, including a light incident surface 1 and a light emitting surface 2, which are designed relative to each other and are located in the flat direction of the lens, the light incident surface 1 is concave relative to the center direction of the lens, and is used to gather light from the light source, and the light emitting surface 2 is convex relative to the center direction of the lens, and is used to disperse the gathered light. Furthermore, the lens also includes an upper side surface 4 and a lower side surface 5 of corresponding design, as well as a left side surface 6 and a right side surface 7 of corresponding design.

[0041] Through this design, the light emitted by the lens can be irradiated on the irradiation surface and form a light spot. When the light is irradiated on the 1.2x1.6m irradiation surface 0.8m in front, a typical "human eye" shaped light spot will be formed, that is, the light in the middle is strong, the light in the periphery is weak, and it is roughly elliptical. The intensity distribution of the light spot is highly matched with the visual perception of ordinary human eyes, that is, when ordinary human eyes look at things, the line of sight is mainly concentrated in the middle part, and there is also peripheral vision to see the sides. The light spot design not only meets the main line of sight lighting intensity needs but also makes up for people's peripheral vision habits, thus improving the user's comfort when using it. The light utilization rate of the lamp in the present invention can reach 92%.

[0042] Based on the above implementation, a further optimization is performed, where the upper side surface 4 and the lower side surface 5 of the lens meet the light emitting surface 2, a fixing portion 3 is extended, and the fixing portion 3 is used to fix the lens in the lamp.

[0043] The lens is used to gather and radiate light for the purpose of lighting for the user, and thus the lens needs to be installed in a lamp so that the user can carry it conveniently. In order to ensure that the lens can be well snapped into the lamp without shaking, a fixing portion 3 is extended at the junction of the upper side 4 and the lower side 5 of the lens with the light emitting surface 2. The fixing portion 3 is used to connect two planes in different directions on the lens and snap the lens into the lamp. Very little light is emitted from the fixing portion 3, and there is no substantial effect on the light spot emitted by the lens. In particular, the fixing portion 3 is made of PC material, which has the characteristics of high transparency, light weight, impact resistance, sound insulation, heat insulation, flame retardancy, and aging resistance, and can reduce light loss.

[0044] Further, such as Figure 2 As shown, the fixing portion 3 corresponds to a protrusion in the cross section. In actual application scenarios, the fixing portion 3 can be designed to be a protrusion of any shape such as a circular protrusion, a triangular protrusion, a polygonal protrusion, etc. in the cross section as needed. The shape of the fixing portion 3 is not limited in the present invention, as long as the fixing portion 3 can well clamp the lens in the lamp.

[0045] Based on the above implementation mode, further optimization is carried out, in the cross section of the lens in the longitudinal direction, the radius of the arc of the light-emitting surface 2 is 8-10mm, and the angle is 120°-130°; the radius of the arc of the light-entering surface 1 is 12-18mm, and the angle is 25°-35°; the light-emitting surface 2 and the light-entering surface 1 are arranged in a central symmetrical manner and have the same central symmetry axis, and the distance between the center of the arc of the light-emitting surface 2 and the center of the arc of the light-entering surface 1 on the central symmetry axis is 13-16mm.

[0046] Figure 2 is a schematic diagram of a cross-section structure according to an embodiment of the present invention, such as Figure 2 As shown: In this embodiment, the arc radius of the light-emitting surface 2 is 9mm, and the included angle is 125°, which is consistent with the stereoscopic vision angle of human eyes; in this embodiment, the arc radius of the light-entering surface 1 is 15mm, and the included angle is 30°. Further, in this embodiment, the distance between the arc center of the light-emitting surface 2 and the arc center of the light-entering surface 1 on the central symmetry axis is 14mm. It should be noted that this embodiment is only a specific embodiment of the present invention. The present invention can arbitrarily combine the arc radius and the included angle of the light-entering surface 1 and the light-emitting surface 2 according to the set range to obtain a variety of feasible embodiments. Furthermore, the overlapping visual field of human eyes is 124°, which matches the included angle range of the light-emitting surface, and can ensure that the lens will form a typical "human eye" shaped light spot. In the present invention, the included angle of the light-emitting surface 2 is designed according to the overlapping visual field angle of human eyes, so that the user's comfort feeling during use can be guaranteed.

[0047] like Figure 2 As shown, based on the above implementation mode, the upper side surface 4 and the lower side surface 5 of the lens are further optimized, or the upper side surface 4 and the lower side surface 5 of the lens are free-form surfaces; the free-form surfaces are adjusted based on the straight surface and a plurality of adjustment points; there are multiple adjustment points, and relative to the light incident surface 1 and the light exit surface 2, most of the adjustment points are closer to the light incident surface 1, and the adjustment distance is less than 0.1 mm. Figure 3 The upper side surface 4 and the lower side surface 5 shown in the figure are both straight surfaces. In addition, the upper side surface 4 and the lower side surface 5 can also be designed as free-form surfaces. Through the free-form surfaces, the light spot formed by the lens can be more in line with the shape of a "human eye". When people use headlights for lighting, the light spot formed on the irradiated surface can meet the lighting intensity requirements of the main line of sight and make up for people's peripheral vision habits, thereby improving the user's comfort when using it.

[0048] Figure 3 is a schematic diagram of the front structure of a lens according to an embodiment of the present invention, such as Figure 3 As shown:

[0049] Based on the above implementation mode, further optimization is performed, the left side surface 6 and the right side surface 7 of the lens are straight surfaces; or the left side surface 6 and the right side surface 7 of the lens are spherical surfaces, and the spherical surfaces are obtained by a rotational excision method; the rotational excision method is to assume that the lens is an infinitely long body before excision, and the lens is placed horizontally, the light-emitting surface 2 is located on the upper side of the light-entering surface 1, and the center connecting line of the two planes is used as the vertical axis, the straight line perpendicular to the midpoint of the center connecting line and along the longitudinal direction of the lens is used as the horizontal axis, and any point on the plane formed by the horizontal axis and the vertical axis is used as the center of the sphere to draw a sphere, and the lens is obtained by excising the infinitely long body with the sphere; the radius of the sphere is 10-15mm, and the angle between the line connecting the upper and lower vertices of the two side surfaces after excision and the vertical axis is 25°-30°.

[0050] In the present invention, the left side 6 and the right side 7 of the lens can be straight surfaces at the same time. More preferably, the two side surfaces are spherical surfaces at the same time, wherein the spherical surface is obtained by a rotational excision method. The following is an explanation through a specific embodiment: the lens is placed horizontally, at which time the light-emitting surface 2 is located on the upper side of the light-entering surface 1, the center connecting line of the two planes is used as the vertical axis, the straight line perpendicular to the midpoint of the center connecting line and along the longitudinal direction of the lens is used as the horizontal axis, and any point on the plane formed by the horizontal axis and the vertical axis is used as the center of the sphere. A sphere with a radius of 13 mm is drawn, and the angle between the line connecting the upper and lower vertices of the two side surfaces after excision and the vertical axis is 29°. Further optimized on the basis of the above-mentioned embodiment, the two edges of the longitudinal direction of the light-entering surface 1 of the lens are straight surfaces.

[0051] The two edges of the light incident surface 1 of the lens in the longitudinal direction are designed to be straight surfaces rather than curved surfaces, so that the light incident surface 1 of the lens is easy to align with the light. This design makes the angle between the light incident surface 1 and the upper side surface 4 and the lower side surface 5 not so sharp, which is also conducive to manufacturing the lens and clamping the lens in the lamp.

[0052] Based on the above implementation, the lens is further optimized and made of PC material.

[0053] The PC material has the characteristics of high transparency, light weight, impact resistance, sound insulation, heat insulation, flame retardancy, and aging resistance. The high transparency can improve the light output efficiency of the light source and reduce light loss.

[0054] In another aspect, the present invention provides a headlamp using the lens as described above.

[0055] The lens is clamped in a headlamp, and a light belt is designed on the headlamp. The light belt is worn on the head of a human body, which can facilitate lighting for the user.

[0056] Based on the above implementation, the headlamp is further optimized, comprising a shell having an opening, and the light emitting surface 2 of the lens is directly exposed to the air from the opening of the shell; the headlamp also comprises a light source, and the distance between the light source and the light incident surface 1 of the lens is 0.8-1.5 mm.

[0057] In a specific embodiment, a front shell is further provided in the headlamp, and the front shell is made of transparent material. The front shell and the lens are assembled together at the opening position of the shell; wherein the light incident surface 1 of the lens is aligned with the light source, and the light emitting surface 2 of the lens is aligned with the front shell and assembled at the opening position of the shell.

[0058] Furthermore, based on the above embodiment, the front shell and the lens are optimized, and the front shell and the lens are integrally formed, so that the light-emitting surface 2 of the lens can be directly exposed to the air from the opening of the shell without further assembly; wherein, except for the opening position, the rest of the shell is made of opaque material. The front shell and the lens are integrally formed, which can improve the light-emitting efficiency and simplify the assembly process.

[0059] The light incident surface 1 of the lens is aligned with the light source, and is used to gather the light of the light source. The light source is a COB light source. The COB light source is adopted because the light is uniform, soft, glare-free, and does not hurt the eyes; it has high reliability, no dead light, no light spots; the color rendering index is high, and the luminous efficiency is high; therefore, in the present invention, by integrating the lens with the front shell, the assembly process is simplified and the work efficiency is improved; and a suitable light source is selected to make the light uniform and soft, thereby ensuring the user's comfort when using it, and the high luminous efficiency ensures that the light utilization rate of the lamp can reach 92%.

[0060] Based on the above implementation, the headlamp is further optimized, and has a sensing device. When it senses that a human hand is waving twice, the headlamp is controlled to be turned off or on; the time interval between the two wavings of the human hand is 0.1-0.6 seconds.

[0061] The sensing device in the headlamp can sense the waving of a person's hand. If the person's hand is waved only once, it is easy to cause misoperation. For example, when a person turns his head while wearing a headlamp, and something in front of the head happens to block the sensing light, the sensing device will be triggered to control the headlamp switch. In fact, the user just turns his head to see something and does not want to control the switch of the headlamp. Therefore, the sensing device in the headlamp is set to sense the waving of a person's hand twice, and no matter whether it is waved back and forth twice (in opposite directions) or waved twice in succession in the same direction, the sensing device can be triggered to control the headlamp to be turned off or on, and the time interval between the two waving of the hand must be 0.1-0.6 seconds, which can well avoid the above-mentioned misoperation.

[0062] Beneficial effects of the present invention:

[0063] The embodiment of the present invention provides a lens and a headlamp, wherein the lens is flat and longitudinal; the two end surfaces of the lens in the longitudinal direction are the left side surface and the right side surface, the two opposite surfaces of the lens in the flat direction are the light-entering surface and the light-emitting surface, the two side surfaces of the lens in the longitudinal direction sandwiched between the light-entering surface and the light-emitting surface are the upper side surface and the lower side surface, the light-entering surface is concave relative to the center direction of the lens, and the light-emitting surface is convex relative to the center direction of the lens. Through this design, it is ensured that the light spot of the light emitted by the lens is in the shape of a "human eye", which conforms to the overlapping visual angle of people's two eyes, meets people's visual needs, and improves the user's comfort when using it. By designing and installing a headlamp with the lens as described above, and arranging a sensing device in the headlamp, the headlamp can be turned on and off by waving the hand twice, which is convenient for the user to operate, saves working time, and improves work efficiency.

[0064] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A lens, characterized in that: The lens is flat and longitudinal; the two end surfaces of the lens in the longitudinal direction are the left side surface and the right side surface, the two opposite surfaces of the lens in the flat direction are the light incident surface and the light exit surface, the two side surfaces of the lens in the longitudinal direction sandwiched between the light incident surface and the light exit surface are the upper side surface and the lower side surface, the light incident surface is concave relative to the central direction of the lens, the light exit surface is convex relative to the central direction of the lens, and the light spot of the light emitted by the lens is in the shape of a human eye; A fixing portion is extended from the junction of the upper side surface and the lower side surface of the lens with the light emitting surface, and the fixing portion is used to fix the lens in the lamp; In the cross section of the lens in the longitudinal direction, The arc radius of the light emitting surface is 8-10 mm, and the included angle is 120°-130°; The arc radius of the light incident surface is 12-18 mm, and the included angle is 25°-35°; The light-emitting surface and the light-entering surface are arranged in a central symmetric manner and have the same central symmetry axis, and the distance between the center of the arc of the light-emitting surface and the center of the arc of the light-entering surface on the central symmetry axis is 13-16 mm; The upper side and the lower side of the lens are straight surfaces; or The upper side surface and the lower side surface of the lens are free-form surfaces; the free-form surfaces are adjusted based on a straight surface and a plurality of adjustment points; There are multiple adjustment points, and most of the adjustment points are closer to the light incident surface and the light exit surface, and the adjustment distance is less than 0.1 mm; The left side and the right side of the lens are straight surfaces; or The left side surface and the right side surface of the lens are spherical surfaces, and the spherical surfaces are obtained by a rotation excision method; The rotational excision method assumes that the lens is an infinitely long body before excision, and the lens is placed horizontally, with the light-emitting surface located on the upper side of the light-entering surface. The center connecting line of the two planes is used as the vertical axis, the straight line perpendicular to the midpoint of the center connecting line and along the longitudinal direction of the lens is used as the horizontal axis, and a sphere is drawn with any point on the plane formed by the horizontal axis and the vertical axis as the center of the sphere. The sphere excises the infinitely long body to obtain the lens; the radius of the sphere is 10-15 mm, and the angle between the line connecting the upper and lower vertices of the two side surfaces after excision and the vertical axis is 25°-30°.

2. The lens according to claim 1, characterized in that: Two edges of the light incident surface of the lens in the longitudinal direction are straight surfaces.

3. The lens according to claim 1, characterized in that: The lens is made of PC material.

4. A headlamp, characterized in that: A lens as claimed in any one of claims 1 to 3 is used.

5. The headlamp according to claim 4, characterized in that: The headlamp comprises a shell having an opening, and the light emitting surface of the lens is directly exposed to the air from the opening of the shell; the headlamp further comprises a light source, and the distance between the light source and the light incident surface of the lens is 0.8-1.5 mm.

6. The headlamp according to claim 4, characterized in that: The headlamp has a sensing device, and when it senses that a person's hand is waving twice, the headlamp is controlled to be turned off or on; the time interval between the two wavings of the person's hand is 0.1-0.6 seconds.

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