A mounting structure for a wide-angle lens

Abstract

The invention discloses an installation structure of a wide-angle lens, which has a simple structure and is easy to implement. The arrangement of the sixth meniscus lens enables large-angle light entering the optical lens to be well refracted, making it possible to reduce the aperture of the optical lens and facilitating the realization of a wide-angle function. The arrangement of the fifth meniscus lens facilitates further refracting of the light, which is beneficial to reducing the outer diameter of the rear-end lens. The arrangement of the fourth biconvex lens, the third biconvex lens, the second biconvex lens and the first meniscus lens facilitates subsequent imaging. During assembly, the first meniscus lens, the second biconvex lens, the first spacer, the third biconvex lens, the second spacer, the fourth biconvex lens, the fifth meniscus lens, the third spacer and the sixth meniscus lens are sequentially placed close to the lens barrel to maintain the spacing between the lenses, and the structure is stable and practical.

Description

Technical Field

[0001] The invention relates to a mounting structure for a wide-angle lens. Background Art

[0002] With the widespread application of lenses in surveillance, industrial inspection, intelligent transportation, scanning and copying equipment, and cameras, the demand for lenses is increasing. These high-quality lenses require a large number of lenses to achieve optical imaging. However, using a single pressure ring to maintain the stability of a large number of lens components is difficult. Therefore, overcoming these shortcomings has become a major challenge for those skilled in the art. Summary of the Invention

[0003] The present invention overcomes the deficiencies of the above-mentioned technologies and provides a mounting structure for a wide-angle lens.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A mounting structure for a wide-angle lens comprises a lens barrel 1, in which an annular limiting protrusion 10, a first circular channel 11, a second circular channel 12, a third circular channel 13, and a fourth circular channel 14 are sequentially provided from the image side to the object side of the lens barrel 1, the inner diameters of the first circular channel 11, the inner diameters of the second circular channel 12, the inner diameters of the third circular channel 13, and the inner diameters of the fourth circular channel 14 are arranged from small to large, and a first meniscus lens 21, a second biconvex lens 22, a first spacer 3, a third biconvex lens 23, a second spacer 4, a fourth biconvex lens 24, a fifth meniscus lens 25, a third spacer 5, and a sixth meniscus lens 26 are installed in the lens barrel 1, which are closely arranged from the image side to the object side, each lens having an object side surface and an image side surface, the image side surface of the first meniscus lens 21 being a convex surface and the object side surface being a concave surface, the object side surface of the first meniscus lens 21 being glued to the image side surface of the second biconvex lens 22 to form a biconvex lens, and the lens barrel 1 is provided with a plurality of lens elements, wherein the plurality of lens elements are ... The image side surface of the fifth meniscus lens 25 is concave and the object side surface is convex, the image side surface of the sixth meniscus lens 26 is concave and the object side surface is convex, wherein the first meniscus lens 21, the second biconvex lens 22, the first spacer 3, the third biconvex lens 23, the second spacer 4, and the fourth biconvex lens 24 are limited in the first circular channel 11 and the fourth biconvex lens 24 partially protrudes in the second circular channel 12, the fifth meniscus lens 25 is limited in the second circular channel 12 and partially protrudes in the third circular channel 13, the third spacer 5 is limited in the third circular channel 13 and partially protrudes in the fourth circular channel 14, the sixth meniscus lens 26 is limited in the fourth circular channel 14 and partially protrudes outside the fourth circular channel 14, and a cover ring 6 for pressing the edge of the sixth meniscus lens 26 is threadedly connected to the outer wall of the object side end of the lens barrel 1.

[0006] Preferably, an annular avoidance groove 15 having an inner diameter larger than that of the first circular channel 11 is provided between the annular limiting protrusion 10 and the first circular channel 11 .

[0007] Preferably, the image side surface of the third biconvex lens 23 is more convex than the object side surface of the second biconvex lens 22, and a first annular groove 31 is provided on the inner wall of the first spacer ring 3. The first annular groove 31 is provided with a first image side end annular opening 311 close to the image side surface of the second biconvex lens 22, and a first object side end annular opening 312 close to the object side surface of the third biconvex lens 23. The diameter of the first image side end annular opening 311 is larger than the diameter of the first object side end annular opening 312.

[0008] Preferably, the outer side of the first image-side annular opening 311 and the outer side of the first object-side annular opening 312 are respectively chamfered.

[0009] Preferably, the image side surface of the fourth biconvex lens 24 is more convex than the object side surface of the third biconvex lens 23, and an annular convex edge 40 that does not contact the lenses on both sides is provided on the inner wall of the second spacer ring 4, and the distance between the annular convex edge 40 and the object side surface of the third biconvex lens 23 is smaller than the distance between the annular convex edge 40 and the image side surface of the fourth biconvex lens 24, and the annular convex edge 41 forms a gradually narrowing channel 411 with an inner diameter that gradually narrows from the object side to the image side.

[0010] Preferably, both inner and outer side walls at both ends of the second spacer 4 are chamfered.

[0011] Preferably, a third annular groove 51 is provided on the inner side wall of the third spacer ring 5 , and both sides of the third annular groove 51 are isosceles and chamfered.

[0012] Preferably, an annular step 261 is provided at the object-side edge of the sixth meniscus lens 26 , and the cover ring 6 is provided with an annular convex edge 61 for pressing the annular step 261 when tightening the thread.

[0013] Preferably, the annular limiting protrusion 10 is surrounded by a bell mouth 101 whose inner diameter gradually increases from the inside to the outside.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The structure of this case is simple and easy to implement. The arrangement of the sixth meniscus lens enables the large-angle light entering the optical lens to be well refracted, making it possible to reduce the aperture of the optical lens and facilitating the realization of a wide-angle function. The arrangement of the fifth meniscus lens facilitates further refracting of the light, which is conducive to reducing the outer diameter of the rear lens. The arrangement of the fourth biconvex lens, the third biconvex lens, the second biconvex lens, and the first meniscus lens facilitates subsequent imaging. During assembly, the first meniscus lens, the second biconvex lens, the first spacer, the third biconvex lens, the second spacer, the fourth biconvex lens, the fifth meniscus lens, the third spacer, and the sixth meniscus lens are sequentially placed close to the lens barrel, making assembly convenient. In addition, since the fourth biconvex lens is limited in the first circular channel and a portion of the fourth biconvex lens protrudes out of the second circular channel, In this way, the fifth meniscus lens limited in the second circular channel can be close to the fourth double convex lens, the fifth meniscus lens is limited in the second circular channel and partially protrudes in the third circular channel, so that the third spacer limited in the third circular channel can be close to the fifth meniscus lens, the third spacer limited in the third circular channel and partially protrudes in the fourth circular channel, so that the sixth meniscus lens limited in the fourth circular channel can be close to the third spacer, and the sixth meniscus lens partially protrudes outside the fourth circular channel. In this way, the sixth meniscus lens can be conveniently pressed when the cover ring is tightened, thereby ensuring that the components between the first meniscus lens to the sixth meniscus lens are close in sequence to maintain the spacing between the lenses, which is stable and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of this case.

[0017] Figure 2 This is a diagram of the lens barrel in this case.

[0018] Figure 3 This is the first spacer ring diagram of this case.

[0019] Figure 4 This is the second spacer ring diagram of this case.

[0020] Figure 5 This is the third spacer ring diagram of this case.

[0021] Figure 6 This is the optical path diagram of this case, in which a filter is also provided at the rear end of the lens. DETAILED DESCRIPTION

[0022] The following examples further illustrate the features of the present invention and other related features to facilitate understanding by those skilled in the art:

[0023] like Figures 1 to 6 As shown, a mounting structure of a wide-angle lens includes a lens barrel 1, in which an annular limiting protrusion 10, a first circular channel 11, a second circular channel 12, a third circular channel 13, and a fourth circular channel 14 are sequentially provided from the image side to the object side in the lens barrel 1, and the inner diameters of the first circular channel 11, the second circular channel 12, the third circular channel 13, and the fourth circular channel 14 are arranged from small to large. A first meniscus lens 21, a second biconvex lens 22, a first spacer 3, a third biconvex lens 23, a second spacer 4, a fourth biconvex lens 24, a fifth meniscus lens 25, a third spacer 5, and a sixth meniscus lens 26 are installed in the lens barrel 1, which are closely arranged from the image side to the object side in sequence, each lens having an object side surface and an image side surface, the image side surface of the first meniscus lens 21 being a convex surface and the object side surface being a concave surface, and the object side surface of the first meniscus lens 21 being glued to the image side surface of the second biconvex lens 22 to form a biconvex lens. The image side surface of the fifth meniscus lens 25 is concave and the object side surface is convex; the image side surface of the sixth meniscus lens 26 is concave and the object side surface is convex; wherein the first meniscus lens 21, the second biconvex lens 22, the first spacer 3, the third biconvex lens 23, the second spacer 4, and the fourth biconvex lens 24 are limited in the first circular channel 11 and the fourth biconvex lens 24 partially protrudes in the second circular channel 12; the fifth meniscus lens 25 is limited in the second circular channel 12 and partially protrudes in the third circular channel 13; the third spacer 5 is limited in the third circular channel 13 and partially protrudes in the fourth circular channel 14; the sixth meniscus lens 26 is limited in the fourth circular channel 14 and partially protrudes outside the fourth circular channel 14; a cover ring 6 for pressing the edge of the sixth meniscus lens 26 is threadedly connected to the outer wall of the object side end of the lens barrel 1.

[0024] As described above, the structure of this case is simple and easy to implement. The arrangement of the sixth meniscus lens 26 enables the large-angle light entering the optical lens to be well refracted, making it possible to reduce the aperture of the optical lens and facilitating the realization of a wide-angle function. The arrangement of the fifth meniscus lens 25 facilitates further refracting of the light, which is beneficial to reducing the outer diameter of the rear-end lens. The arrangement of the fourth biconvex lens 24, the third biconvex lens 23, the second biconvex lens 22, and the first meniscus lens 21 facilitates subsequent imaging. During assembly, the first meniscus lens 21, the second biconvex lens 22, the first spacer 3, the third biconvex lens 23, the second spacer 4, the fourth biconvex lens 24, the fifth meniscus lens 25, the third spacer 5, and the sixth meniscus lens 26 are sequentially placed close to the lens barrel 1, which is convenient for assembly. In addition, since the fourth biconvex lens 24 is limited in the first circular channel 11 and the fourth biconvex lens 24 partially protrudes in the second circular channel 12, In this way, the fifth meniscus lens 25 limited in the second circular channel 12 can be close to the fourth biconvex lens 24, the fifth meniscus lens 25 is limited in the second circular channel 12 and partially protrudes in the third circular channel 13, so that the third spacer 5 limited in the third circular channel 13 can be close to the fifth meniscus lens 25, the third spacer 5 is limited in the third circular channel 13 and partially protrudes in the fourth circular channel 14, so that the sixth meniscus lens 26 limited in the fourth circular channel 14 can be close to the third spacer 5, and the sixth meniscus lens 26 partially protrudes outside the fourth circular channel 14, so that the sixth meniscus lens 26 can be conveniently pressed when the cover ring 6 is tightened, thereby ensuring that the components between the first meniscus lens 21 to the sixth meniscus lens 26 are close in sequence to maintain the spacing between each lens, which is stable and practical.

[0025] As described above, in a specific implementation, an annular avoidance groove 15 having an inner diameter larger than that of the first circular channel 11 is provided between the annular limiting protrusion 10 and the first circular channel 11 to facilitate the installation of a seal.

[0026] As mentioned above, Figure 1 、 Figure 3 、 Figure 6As shown, the image side surface of the third biconvex lens 23 is more convex than the object side surface of the second biconvex lens 22, and a first annular groove 31 is provided on the inner wall of the first spacer 3. The first annular groove 31 is provided with a first image side end annular opening 311 for abutting against the object side surface of the second biconvex lens 22 near the image side end, and a first object side end annular opening 312 for abutting against the image side surface of the third biconvex lens 23 near the object side end. The aperture of the first image side end annular opening 311 is larger than the aperture of the first object side end annular opening 312. In this way, the image side surface of the third biconvex lens 23 is deeper into the first spacer 3 than the object side surface of the second biconvex lens 22, and the light emitted outward from the image side surface of the third biconvex lens 23 is not easily blocked by the inner wall surface of the first annular groove 31 and cannot reach the object side surface of the second biconvex lens 22.

[0027] As described above, in a specific implementation, chamfers are respectively provided on the outer side of the first image-side annular opening 311 and the outer side of the first object-side annular opening 312 .

[0028] As mentioned above, Figure 1 、 Figure 4 、 Figure 6 As shown, the image side surface of the fourth biconvex lens 24 is more convex than the object side surface of the third biconvex lens 23, and an annular convex edge 40 that does not contact the lenses on both sides is provided on the inner wall of the second spacer 4, and the distance between the annular convex edge 40 and the object side surface of the third biconvex lens 23 is smaller than the distance between the annular convex edge 40 and the image side surface of the fourth biconvex lens 24, and the annular convex edge 41 forms a gradually narrowing channel 411 with an inner diameter that gradually narrows from the object side to the image side.

[0029] As described above, the setting of the annular convex edge 41 in the second spacer 4 of this case plays a role in suppressing stray light, and light can only pass through the gradually narrowing channel 411. The setting of the gradually narrowing channel 411 with an inner diameter gradually narrowing from the object side to the image side makes it difficult for light emitted from the image side of the fourth biconvex lens 24 to the image side opening of the gradually narrowing channel 411 to be blocked by the object side opening wall of the gradually narrowing channel 411.

[0030] As described above, in specific implementation, both inner and outer side walls at both ends of the second spacer 4 are provided with chamfers.

[0031] As mentioned above, Figure 5 As shown, a third annular groove 51 is provided on the inner side wall of the third spacer ring 5 , and both sides of the third annular groove 51 are isosceles and chamfered.

[0032] As described above, in a specific implementation, an annular step 261 is provided at the object side edge of the sixth meniscus lens 26 , and the cover ring 6 is provided with an annular convex edge 61 for pressing the annular step 261 when tightening the thread.

[0033] As described above, in a specific implementation, the annular limiting protrusion 10 is surrounded by a trumpet mouth 101 whose inner diameter gradually increases from the inside to the outside. In this way, the light emitted from the image side of the first meniscus lens 21 is not easily blocked by the inner wall of the annular limiting protrusion 10.

[0034] As mentioned above, this case protects a mounting structure for a wide-angle lens, and all technical solutions that are identical or similar to this case should be deemed to fall within the scope of protection of this case.

Claims

1. A wide-angle lens installation structure, characterized in that The lens barrel (1) comprises a ring-shaped limiting protrusion (10), a first circular channel (11), a second circular channel (12), a third circular channel (13), and a fourth circular channel (14) in sequence from the image side to the object side of the lens barrel (1), wherein the inner diameters of the first circular channel (11), the second circular channel (12), the third circular channel (13), and the fourth circular channel (14) are arranged from small to large, and the lens barrel (1) is provided with a first meniscus in sequence from the image side to the object side. lens (21), a second biconvex lens (22), a first spacer (3), a third biconvex lens (23), a second spacer (4), a fourth biconvex lens (24), a fifth meniscus lens (25), a third spacer (5), and a sixth meniscus lens (26), each of the lenses having an object side surface and an image side surface, the image side surface of the first meniscus lens (21) being a convex surface and the object side surface being a concave surface, the object side surface of the first meniscus lens (21) being glued to the image side surface of the second biconvex lens (22) to form a biconvex lens, the fifth meniscus lens (25) being a convex surface and the image side surface of the second meniscus lens (22) being glued to form a biconvex lens, The image side surface of the lens (25) is a concave surface, and the object side surface is a convex surface; the image side surface of the sixth meniscus lens (26) is a concave surface, and the object side surface is a convex surface; wherein the first meniscus lens (21), the second biconvex lens (22), the first spacer (3), the third biconvex lens (23), the second spacer (4), and the fourth biconvex lens (24) are limited in the first circular channel (11), and the fourth biconvex lens (24) partially protrudes in the second circular channel (12); the fifth meniscus lens (25) is limited in The second circular channel (12) is in the second circular channel (12) and partially protrudes from the third circular channel (13); the third spacer (5) is limited in the third circular channel (13) and partially protrudes from the fourth circular channel (14); the sixth meniscus lens (26) is limited in the fourth circular channel (14) and partially protrudes from the fourth circular channel (14); and a cover ring (6) for pressing the edge of the sixth meniscus lens (26) is threadedly connected to the outer wall of the object side end of the lens barrel (1); The image side surface of the third biconvex lens (23) is more convex than the object side surface of the second biconvex lens (22); a first annular groove (31) is provided on the inner side wall of the first spacer ring (3); a first image side end annular opening (311) is provided near the image side end of the first annular groove (31) for abutting against the object side surface of the second biconvex lens (22); and a first object side end annular opening (312) is provided near the object side end of the first annular groove (311) for abutting against the image side surface of the third biconvex lens (23); the diameter of the first image side end annular opening (311) is larger than the diameter of the first object side end annular opening (312); The image side surface of the fourth biconvex lens (24) is more convex than the object side surface of the third biconvex lens (23); an annular convex edge (40) which does not contact the lenses on both sides is provided on the inner side wall of the second spacer (4); the distance between the annular convex edge (40) and the object side surface of the third biconvex lens (23) is smaller than the distance between the annular convex edge (40) and the image side surface of the fourth biconvex lens (24); the annular convex edge (41) encloses a gradually narrowing channel (411) whose inner diameter gradually narrows from the object side to the image side; The inner and outer side walls at both ends of the second spacer (4) are provided with chamfers.

2. The installation structure of a wide-angle lens according to claim 1, characterized in that An annular avoidance groove (15) having an inner diameter larger than that of the first circular channel (11) is provided between the annular limiting protrusion (10) and the first circular channel (11).

3. The installation structure of a wide-angle lens according to claim 1, characterized in that The first image side annular opening (311) and the first object side annular opening (312) are respectively provided with chamfers on the outer side.

4. The wide-angle lens installation structure according to claim 1, characterized in that A third annular groove (51) is provided on the inner side wall of the third spacer ring (5), and two sides of the third annular groove (51) are isosceles and chamfered.

5. The wide-angle lens installation structure according to claim 1, characterized in that An annular step (261) is provided at the object side edge of the sixth meniscus lens (26), and the cover ring (6) is provided with an annular convex edge (61) for pressing the annular step (261) when tightening the thread.

6. A wide-angle lens mounting structure according to any one of claims 1 to 5, characterized in that The annular limiting protrusion (10) is surrounded by a bell mouth (101) whose inner diameter gradually increases from the inside to the outside.

Images