A lens structure for accelerating the dissipation of fog

Abstract

The present invention provides a lens structure for accelerating the dissipation of fog, which accelerates the dissipation of water vapor without increasing the cost, thereby improving the popularity rate. The central area of ​​the first mirror surface of the first lens is exposed to the outside, the inner surface of the first lens includes a supporting positioning surface at the outer diameter position and a second mirror surface concave at the inner diameter position, the radial outer periphery of the front surface of the second lens is ringed with a plurality of convex positioning arc platforms, and an arc interval is left between adjacent positioning arc platforms, the radial inner part of the second lens is a convex third mirror surface, the radial inner ring of the supporting positioning surface is arranged close to the convex positioning arc platform, the lens barrel is mounted on the outer periphery of the first lens and the corresponding position of the outer periphery of the second lens, and the center of the lens barrel body is provided with a rear through hole and other optical components for imaging, the outer periphery of the lens barrel is provided with an external thread, the internal thread of the locking ring is connected to the external thread of the lens barrel, and the front end positioning stop of the locking ring is arranged close to the outer peripheral area of ​​the first mirror surface of the first lens.

Description

Technical Field

[0001] The invention relates to the technical field of lens structures, and in particular to a lens structure capable of accelerating the dissipation of fog. Background Art

[0002] With the continuous improvement of economic level, building smart cities has become a very urgent development demand. Smart transportation is a key part of building smart cities, and vehicle-mounted cameras are important components for fully realizing smart transportation.

[0003] The working environment of vehicle-mounted lenses is relatively complex and will be greatly affected by the working environment and its own structure and material. Since the working environment of the car changes dynamically in real time with the weather, road conditions, etc., the performance of the lens will be greatly affected in extreme weather conditions, such as rain, snow, cold weather, etc. The inner surface of the first lens of ordinary vehicle-mounted lenses is very easy to fog up, resulting in unclear imaging. As we all know, the degree of automatic driving of cars is gradually increasing, and the dominant position of drivers in car driving is gradually weakening. Therefore, vehicle-mounted lenses will become the "eyes" in driving. Therefore, unclear imaging caused by lens fogging will be a major risk point in automatic driving.

[0004] The main reason for lens fogging is the presence of water vapor inside the lens. When the temperature outside the lens suddenly drops (raining), the first exposed lens L1 of the lens is cooled first, while the air in the internal space Q1 has not cooled down in time. At this time, the water vapor in the internal space Q1 will liquefy and adhere to the inner surface S2 of L1 to form water droplets and water vapor. In addition, the close fit between L1 and L2 makes the space of Q1 almost airtight. Therefore, the only way to dissipate the water vapor is to reduce the temperature difference between the air in L1 and Q1. The current mainstream solution is to heat L1 to accelerate the dissipation of water vapor, but the heating structure needs to be designed in conjunction with the lens module and has a complex structure, high cost and low popularity. Summary of the invention

[0005] In view of the above problems, the present invention provides a lens structure that accelerates the dissipation of fog, which accelerates the dissipation of water vapor without increasing costs, thereby improving the popularity.

[0006] A lens structure for accelerating the dissipation of fog, characterized in that it comprises a first lens, a second lens barrel, and a locking ring, the central area of ​​the first mirror surface of the first lens is exposed, the inner surface of the first lens comprises a supporting positioning surface at the outer diameter position, and a second mirror surface concave at the inner diameter position, the radial outer periphery of the front surface of the second lens is ringed with a plurality of convex positioning arc platforms, and an arc interval is left between adjacent positioning arc platforms, the radial inner part of the second lens is a convex third mirror surface, the radial inner ring of the supporting positioning surface is arranged closely against the positioning arc platform, the barrel is mounted on the outer periphery of the first lens and the corresponding position of the outer periphery of the second lens, and the center of the barrel body is provided with a rear through hole and other optical components for imaging, the outer periphery of the barrel An external thread is provided, the internal thread of the locking ring is connected to the external thread of the lens barrel, and the front end positioning stop of the locking ring is arranged in close contact with the outer area of ​​the first mirror surface of the first lens, a sealing ring is provided below the radial outer ring area of ​​the lens barrel corresponding to the supporting positioning surface, and the radial outer ring area of ​​the supporting positioning surface presses the sealing ring, and at least one concave notch is provided on the outer circumference of the second lens, and the position of the outer circumference of the lens barrel corresponding to the second lens is a front end circular hole structure, and the front end circular hole of the lens barrel is tightly sleeved on the outer circumference of the second lens, and the rear center area of ​​the second lens is concave to form a fourth mirror surface, and a spacing is left between the radial middle area of ​​the supporting positioning surface of the first lens and the corresponding position of the stop end face of the front end face of the lens barrel.

[0007] It is further characterized by:

[0008] The radial outer ring area of ​​the bearing positioning surface is compressed by 20%-30% corresponding to the sealing ring, reaching the waterproof level of IP69;

[0009] The first lens is made of glass, the second mirror surface is concave, the first mirror surface is convex, and the supporting positioning surface is a plane;

[0010] The second lens is made of plastic material, the third mirror surface is convex, the fourth mirror surface is concave, the arc interval is the ventilation groove, the depth A of the ventilation groove satisfies 0.02mm≤A≤0.1mm, and the proportion of the total arc length B of all ventilation grooves to the whole circle satisfies 20%≤B / whole circle≤30%;

[0011] An inner concave notch is arranged on the outer circumference of the second lens, and the inner concave notch is the glue inlet position of the second lens.

[0012] After adopting the present invention, when the lens is working (see Figure 5) When cold air arrives in the Q0 space, the temperature of the first lens drops rapidly. At this time, the temperature of the first lens is lower than the temperature of the gas in the Q1 space, resulting in the appearance of liquefied water droplets on the second mirror surface of the first lens (i.e., fogging). In the existing solution, the Q1 space is almost closed, resulting in poor gas fluidity after fogging, and the fog can only be dissipated by transferring heat from the second lens to the Q1 space, so the fog dissipates slowly. In the present technical solution, the Q1 space is connected to the Q2 space. When fog is formed, the liquefaction phenomenon of the second mirror surface causes a certain temperature difference between Q1 and Q2, thereby forming a pressure difference, resulting in the hot air in Q2 exchanging gas with the air in Q1 to form a certain air flow (as indicated by the arrow in the figure), so that the hot air in the Q2 space can contact the liquefied water vapor on the S2 surface to accelerate the dissipation of the fog; and the hot air in the Q2 space comes from the power-on heat of the chip module, which accelerates the dissipation of water vapor without increasing costs, thereby increasing the popularity rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional structural schematic diagram of the present invention;

[0014] Figure 2 is a cross-sectional schematic diagram of the first lens of the present invention;

[0015] Figure 3 is a cross-sectional schematic diagram of a second lens of the present invention;

[0016] Figure 4 for Figure 3 A schematic diagram of a top view structure;

[0017] Figure 5 It is a schematic diagram of air flow when the present invention is cooled;

[0018] The names corresponding to the serial numbers in the figure are as follows:

[0019] The first lens L1, the second lens L2, the locking ring M1, the sealing ring M2, the lens barrel M3, the first mirror surface S1, the second mirror surface S2, the supporting positioning surface S3, the third mirror surface S4, the fourth mirror surface S5, the arc interval S6, the positioning arc platform S7, and the concave notch D1. DETAILED DESCRIPTION

[0020] A lens structure that speeds up the dissipation of fog, see Figure 1-Figure 5It comprises a first lens L1, a second lens L2, a lens barrel M3, and a locking ring M1. The central area of ​​the first mirror surface S1 of the first lens L1 is exposed. The inner surface of the first lens L1 comprises a supporting positioning surface S3 at an outer diameter position and a second mirror surface S2 which is concave at an inner diameter position. The radial outer periphery of the front surface of the second lens L2 is ringed with a plurality of convex positioning arc platforms S7, and an arc interval S6 is left between adjacent positioning arc platforms S7. The radial inner part of the second lens L2 is a convex third mirror surface S4, and the radial inner ring of the supporting positioning surface S3 is arranged closely to the positioning arc platform S7. The lens barrel M3 is mounted on the outer periphery of the first lens L1 and the corresponding position of the outer periphery of the second lens L2. The center of the lens barrel M3 body is provided with a rear through hole and other optical components for imaging. The outer periphery of the lens barrel M3 is provided with an outer The inner thread of the locking ring M1 is connected to the outer thread of the lens barrel M3, and the front end positioning stop of the locking ring M1 is arranged in close contact with the outer area of ​​the first mirror surface S1 of the first lens L1. A sealing ring M2 is arranged below the radial outer ring area of ​​the lens barrel M3 corresponding to the supporting positioning surface S3, and the radial outer ring area of ​​the supporting positioning surface S3 presses the sealing ring M2. At least one concave notch D1 is arranged on the outer circumference of the second lens L2. The position of the outer circumference of the lens barrel M3 corresponding to the second lens L2 is a front end circular hole structure. The front end circular hole of the lens barrel M3 is tightly sleeved on the outer circumference of the second lens L2. The rear center area of ​​the second lens L2 is concave to form a fourth mirror surface S5. There is a spacing between the radial middle area of ​​the supporting positioning surface S3 of the first lens L1 and the corresponding position of the end face of the front end stop of the lens barrel M3.

[0021] The radial outer ring area of ​​the support positioning surface S3 corresponds to the compression of the sealing ring M2 by 20%-30%, reaching the waterproof grade of IP69;

[0022] The first lens L1 is made of glass, the second mirror surface S2 is concave, the first mirror surface S1 is convex, and the supporting and positioning surface S3 is a plane.

[0023] The second lens L2 is made of plastic material, the third mirror surface S4 is convex, the fourth mirror surface S5 is concave, the arc interval S6 is the ventilation groove, the depth A of the ventilation groove satisfies 0.02mm≤A≤0.1mm, and the proportion of the total arc length B of all ventilation grooves to the whole circle satisfies 20%≤B / whole circle≤30%;

[0024] An inner concave notch D1 is arranged on the outer circumference of the second lens L2, and the inner concave notch D1 is the glue inlet position of the second lens L2.

[0025] Its working principle is as follows: When the lens is working (see Figure 5) When cold air arrives in the Q0 space, the temperature of the first lens L1 drops rapidly. At this time, the temperature of the first lens L1 is lower than the temperature of the gas in the Q1 space, resulting in the appearance of liquefied water droplets on the second mirror S2 of the first lens L1 (i.e., fogging). In the existing solution, the Q1 space is almost closed, resulting in poor gas fluidity after fogging, and the fog can only be dissipated by heat transfer, so the fog dissipates slowly. In the present technical solution, the Q1 space is connected to the Q2 space. When fog is formed, the liquefaction of the second mirror S2 causes a certain temperature difference between Q1 and Q2, resulting in the hot air of Q2 exchanging heat with the air in Q1 to form a certain air flow (as indicated by the arrow in the figure), so that the hot air of Q2 can contact the liquefied water vapor on the S2 surface to accelerate the dissipation of the fog; it accelerates the dissipation of water vapor without increasing costs, thereby improving the popularity rate.

[0026] The following is the experimental results comparison data;

[0027] Experimental conditions: After baking in an 85℃ oven for 2 hours, take it out and put it in 0℃ ice water (immerse the lens head in ice water) for 1 minute. Wipe the surface of lens G1 with a dust-free cloth and observe with a 10X microscope to see if there is fogging. If there is fogging, record the time it takes for the fog to dissipate.

[0028] Experimental results: fog dissipation time (unit / s)

[0029] 1 2 3 Q1 independent closed 43 33 62 Q1 connects to Q2 0 0 0

[0030] Because the fog dissipated too quickly, the recorded time was 0.

[0031] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0032] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A lens structure for accelerating the dissipation of fog, characterized in that: It includes a first lens, a second lens, a lens barrel, and a locking ring. The central area of ​​the first mirror surface of the first lens is exposed to the outside. The inner surface of the first lens includes a supporting positioning surface at the outer diameter position and a second mirror surface concave at the inner diameter position. The radial outer periphery of the front surface of the second lens is ringed with a plurality of convex positioning arc platforms, and an arc interval is left between adjacent positioning arc platforms. The radial inner part of the second lens is a convex third mirror surface, and the radial inner ring of the supporting positioning surface is arranged closely to the positioning arc platform. The lens barrel is mounted on the outer periphery of the first lens and the corresponding position of the outer periphery of the second lens, and the center of the lens barrel body is provided with a rear through hole and an optical component for imaging. The outer periphery of the lens barrel is provided with an external thread, and the locking ring The internal thread is connected to the external thread of the lens barrel, and the front end positioning stop of the locking ring is arranged in close contact with the outer area of ​​the first mirror surface of the first lens, a sealing ring is arranged below the radial outer ring area of ​​the lens barrel corresponding to the supporting positioning surface, and the radial outer ring area of ​​the supporting positioning surface presses the sealing ring, and the outer circumference of the second lens is provided with at least one concave notch, the position of the outer circumference of the lens barrel corresponding to the second lens is a front end circular hole structure, the front end circular hole of the lens barrel is tightly sleeved on the outer circumference of the second lens, the rear center area of ​​the second lens is concave to form a fourth mirror surface, and a spacing is left between the radial middle area of ​​the supporting positioning surface of the first lens and the corresponding position of the stop end face of the front end face of the lens barrel.

2. A lens structure for accelerating the dissipation of fog as claimed in claim 1, characterized in that: The radial outer ring area of ​​the bearing positioning surface is compressed by 20%-30% corresponding to the sealing ring, reaching the waterproof level of IP69.

3. A lens structure for accelerating the dissipation of fog as claimed in claim 1, characterized in that: The first lens is made of glass, the second mirror surface is concave, the first mirror surface is convex, and the supporting positioning surface is a plane.

4. A lens structure for accelerating the dissipation of fog as claimed in claim 1, characterized in that: The second lens is made of plastic material, the third mirror surface is convex, the fourth mirror surface is concave, the arc interval is the ventilation groove, the depth A of the ventilation groove satisfies 0.02mm≤A≤0.1mm, and the proportion of the overall arc length B of all ventilation grooves to the whole circle satisfies 20%≤B / whole circle≤30%.

5. A lens structure for accelerating the dissipation of fog as claimed in claim 4, characterized in that: An inner concave notch is arranged on the outer circumference of the second lens, and the inner concave notch is the glue inlet position of the second lens.

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