CN211454193U - Wide-angle conversion lens for correcting underwater chromatic aberration and enlarging lens visual angle - Google Patents

Abstract

The utility model relates to a correct wide angle conversion camera lens of chromatic aberration under water and enlarged camera lens visual angle, including lens cone shell, lens subassembly and lens hood. The connecting end of the lens cone shell and the camera waterproof shell is provided with a rotary quick-release connecting piece and a sealing piece. The lens assembly comprises a first lens, a second lens, a third lens and a fourth lens which are coaxially arranged in the lens barrel in sequence, the first lens is positioned at the object side end and sealed with the lens barrel shell, the second lens and the third lens are negative lenses, and the fourth lens is a positive lens; when the camera is used underwater, the chromatic aberration caused by water can be corrected, the image quality is improved, and the wide-angle visual angle of the camera lens is enlarged. The lens hood and the lens cone shell are designed in a split mode, and the upper piece and the lower piece are of swing structures; when in use, the valve is opened outwards and when not in use, the valve is closed inwards, thereby effectively reducing the overall size. Thirdly, the connecting end of the lens cone shell is provided with a rotary quick-release interface and a sealing design, so that the wide-angle conversion lens can be connected with a camera waterproof shell in a quick and sealing manner on land, and the wide-angle conversion lens is convenient to disassemble and assemble.

Description

Wide-angle conversion lens for correcting underwater chromatic aberration and enlarging lens visual angle

Technical Field

The utility model relates to an optical imaging technical field, concretely relates to correct camera/camera and use wide-angle lens to shoot the colour difference problem of in-process formation of image under water with enlarge the wide-angle conversion camera lens of camera lens visual angle under water.

Background

The wide-angle lens has the advantages of short focal length and large visual angle, can shoot a wide scene at a short distance, has the depth of field range remarkably larger than that of a standard lens and a telephoto lens, and has strong depth feeling of the picture. The focal length of the general wide-angle lens is 11-28mm, the diagonal angle range is 126-75 degrees, and the wide-angle lens is widely used for shooting large-scene and landscape works and is also commonly used for underwater photography.

Underwater wide-angle photographing systems generally consist of a waterproof dome mounted in a waterproof housing of a camera and a terrestrial wide-angle lens mounted in the dome. The waterproof ball cover is generally made of acrylic or optical glass and is hermetically connected with the waterproof camera shell through a waterproof shell. Because the refraction of water and the contact surface of the water and the spherical cover are circular arc surfaces, the system can only receive a deformed image, and the shot image is generally fuzzy, has deformed corners and has color stripes (chromatic aberration). At present, the definition of the corner can be improved only by increasing the depth of field, namely, reducing the aperture of a lens, but the chromatic aberration generated by an aqueous medium always exists.

Disclosure of Invention

The utility model aims at providing a correct wide angle conversion camera lens of chromatic aberration under water and enlarged lens visual angle for solve camera or camera and use the chromatic aberration of wide-angle lens when shooting under water, improve the image quality, and further enlarge visual angle and size minimizing, and solve with the waterproof casing of camera at the problem of on-shore quick assembly disassembly.

An embodiment provides a wide conversion lens for correcting underwater chromatic aberration and enlarging a lens view angle, including:

the connecting end of the lens cone shell is provided with a connecting piece and a sealing piece which are used for rotating and quickly disassembling, the connecting piece is used for being connected with the camera waterproof shell, and the sealing piece is used for sealing a gap between the lens cone shell and the camera waterproof shell; a camera and a wide-angle lens are arranged in the camera waterproof shell;

the lens assembly comprises a first lens, a second lens, a third lens and a fourth lens which are coaxially mounted in the lens cone shell in sequence, the first lens is far away from the connecting end of the lens cone shell, the fourth lens is close to the connecting end of the lens cone shell, the first lens is hermetically connected with the lens cone shell, a sealed accommodating cavity is formed in the lens cone shell under the state that the lens cone shell is connected with the waterproof camera shell, and the second lens, the third lens and the fourth lens are located in the accommodating cavity; the first lens is a waterproof lens, the second lens and the third lens are negative lenses, and the fourth lens is a positive lens;

the lens hood comprises four blades, the left, right, upper and lower positions of the object side end of the lens cone shell are respectively provided with one blade, the blades positioned at the left and right positions are fixed on the lens cone shell, and the blades positioned at the upper and lower positions are respectively hinged on the lens cone shell through a hinge shaft; the hinge shaft is fixedly connected with the blades and rotatably penetrates through the lens cone shell, and the hinge shaft is in sealing connection with the lens cone shell; the lens cone shell is further provided with a manual knob, a gear transmission part and swing rod assemblies are arranged in the lens cone shell, the manual knob is connected with the gear transmission part, the gear transmission part is respectively connected with the hinge shafts through the two swing rod assemblies, one of the swing rod assemblies is correspondingly connected with one of the hinge shafts, and the manual knob sequentially controls the blades located at the upper position and the lower position to be opened or closed simultaneously through the gear transmission part and the swing rod assemblies.

In one embodiment, the connecting end of the lens barrel housing is provided with an axial annular groove, the sealing element is a sealing ring, and the sealing element is installed in the annular groove.

In one embodiment, the connecting member is a connecting ring, and the connecting ring is mounted on the end surface of the connecting end of the lens barrel housing, or the connecting ring is integrally formed on the end surface of the connecting end of the lens barrel housing; the outer circumference of the connecting ring is provided with a plurality of outer buckles which are uniformly distributed, and the outer buckles are matched with the inner buckles of the camera waterproof shell.

In one embodiment, the incident surface of the second lens is a convex surface, the emergent surface of the second lens is a concave surface, the incident surface of the third lens is a concave surface, and the emergent surface of the third lens is a convex surface; the incident surface of the fourth lens is a convex surface, and the emergent surface of the fourth lens is a concave surface.

In one embodiment, the abbe number of the second lens is 38-42, the abbe number of the third lens is 22-24, and the abbe number of the fourth lens is 24-28.

In one embodiment, the refractive index of the second lens is 1.7-1.9, the refractive index of the third lens is 1.7-1.9, and the refractive index of the fourth lens is 1.6-1.8.

In one embodiment, a broadband antireflection coating is attached to a surface of the first lens, the second lens, the third lens, and the fourth lens.

In one embodiment, the accommodating cavity of the lens barrel shell is expanded to form a buoyancy cavity, and the buoyancy cavity generates buoyancy under water to offset the weight of the wide-angle conversion lens.

According to the wide-angle conversion lens for correcting underwater chromatic aberration and enlarging the visual angle of the lens in the embodiment, because the four lenses are arranged in the lens barrel shell, two of the four lenses are negative lenses, and one of the four lenses is a positive lens, the lens assembly can correct chromatic aberration caused by underwater shooting, and the image quality is improved; the four lenses form a wide-angle objective lens, so that the optical visual angle is enlarged, and a camera can be assisted to shoot a wider-range image underwater.

Because the lens hood and the lens cone shell adopt split type design, and the upper and lower pieces are in swing structures; can be opened outwards when in use and closed inwards when not in use, thereby effectively reducing the overall size.

In addition, the connecting end of the lens cone shell is provided with a connecting piece and a sealing piece, so that the wide-angle conversion lens can be directly connected with the camera waterproof shell in a quick and sealed manner on land, and the wide-angle conversion lens is more convenient to disassemble and assemble.

Drawings

Fig. 1 is an axial sectional view of a wide-angle conversion lens in a use state in one embodiment;

FIG. 2 is a perspective view of a wide-angle lens assembly according to an embodiment;

FIG. 3 is a schematic diagram of a waterproof camera case according to an embodiment;

FIG. 4 is an optical diagram of a lens assembly in one embodiment;

FIG. 5 is a partial enlarged view A of FIG. 1;

FIG. 6 is a sectional view of a lens barrel housing in an embodiment;

FIG. 7 is a partial enlarged view B of FIG. 6;

FIG. 8 is a view showing an operation state of a disc cam block when upper and lower blades are opened in one embodiment;

FIG. 9 is a view showing an operation state of the cam block when the upper and lower vanes are closed in one embodiment;

FIG. 10 is a chart of Nikon Z7 camera and 14-30 wide angle lens for underwater photography using a conventional optical dome and Imatest analysis for chromatic aberration;

FIG. 11 is a chart of an underwater photography and Imatest analysis for chromatic aberration for a Nikon Z7 camera and a 14-30 wide-angle lens using the wide-angle conversion lens of the present example;

the camera comprises a 100-wide-angle conversion lens, a 200-land wide-angle lens, a 10-lens cone shell, an 11-light shield, 111-blades, 112-handles, 12-connecting pieces, 121-outer fasteners, 122-sealing pieces, 13-annular grooves, 14-containing cavities, 15-annular seats, 16-buoyancy cavities, 17-flanges, 171-annular grooves, 20-lens components, 21-first lenses, 211-O-shaped sealing rings, 22-second lenses, 23-third lenses, 24-fourth lenses, 300-camera waterproof shells, 301-inner snap rings, 302-positioning blocks, 303-inner fasteners and 304-locking knobs; 40-a swing rod assembly, 41-a pin, 42-a hinge shaft, 43-a swing rod, 44-a bearing set, 45-a rotating shaft, 46-an elastic roller, 47-a tension spring, 48-a limiting block, 50-a manual knob, 60-a transmission part, 61-a driving shaft, 62-a driving gear, 63-a driven gear ring, 64-a flange, 65-a disc cam block, 651-a guide groove, 652-a pit, 653-a pit and 66-an O-ring.

Detailed Description

The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.

Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). For convenience of description, in the present embodiment, the end facing the object side is a front end, and the end facing the image side is a rear end.

The embodiment discloses a wide-angle conversion lens for correcting underwater chromatic aberration and enlarging the visual angle of the lens, which is mainly used by diving enthusiasts in water, and is particularly used for shooting in the sea. The wide-angle conversion lens is matched with a camera waterproof shell and a land wide-angle lens for use. The wide-angle conversion lens has the effects of correcting chromatic aberration and expanding visual angle, assists a land camera to shoot high-quality images underwater, and can be quickly assembled and disassembled with a camera waterproof shell on the shore.

As shown in fig. 1 and fig. 2, the wide-angle conversion lens 100 of the present embodiment mainly includes a lens barrel housing 10 and a lens assembly 20, the lens barrel housing 10 is made of a waterproof material, for example, an aluminum alloy material, the lens barrel housing 10 is a cylindrical structure, and the lens barrel housing 10 has a through hole penetrating the whole body. The lens hood 11 is installed at the front end of the lens barrel housing 10, and the lens hood 11 is composed of four trapezoidal lens shades and is used for eliminating reflection and stray light, improving the imaging definition and color restoration, and protecting the lens assembly 20 from accidental collision. The rear end of lens cone shell 10 is the link, and the link of lens cone shell 10 is the loop configuration, installs connecting piece 12 and sealing member 122 on the terminal surface of the link of lens cone shell 10, and the front end trompil of waterproof casing 300 of camera is equipped with the joint part. The camera and the land wide-angle lens 200 are connected together and installed in the waterproof camera case 300, and the lens barrel housing 10 can be quickly assembled and disassembled with the joint part of the waterproof camera case 300 through the connecting member 12 and the sealing member 122.

The connector 12 is a connection ring, the connection ring is mounted on the end face of the connection end of the lens barrel housing 10 by means of screw fixation, a plurality of outer buckles 121 (also called as outer claws) are uniformly distributed on the outer circumference of the connection ring, and the number and position relationship of the outer buckles 121 are correspondingly matched with the inner buckles of the waterproof camera housing 300. In other embodiments, the connector 12 and the lens barrel housing 10 are integrated, and the connector 12 is integrally formed on an end face of the connecting end of the lens barrel housing 10.

As shown in fig. 3, in this embodiment, the clamping component of the waterproof camera housing 300 mainly includes an inner clamping ring 301, a positioning block 302, an inner clamping buckle 303 and a locking knob 304, the inner clamping ring 301 is rotatably installed in the front end hole of the waterproof camera housing 300, a plurality of inner clamping buckles 303 uniformly distributed are arranged in the inner clamping ring 301, the positioning block is arranged in the front end hole of the waterproof camera housing 300, the positioning block 302 is used for limiting the circumferential rotation of the lens barrel housing 10, and the inner clamping buckles 303 are used for clamping with the outer clamping buckles 121 of the lens barrel housing 10. The waterproof camera shell 300 is further provided with a locking knob 304, the locking knob 304 is connected with the inner snap ring 301 through transmission components such as a gear set, and the locking knob 303 is used for driving the inner snap ring 301 to rotate.

In this embodiment, the principle of the quick assembly and disassembly of the wide-angle conversion lens 100 and the waterproof camera housing 300 is as follows: the wide-angle conversion lens 100 and the camera waterproof shell 300 are in a separated state in an initial state, the connecting end of the wide-angle conversion lens 100 is aligned with a circle mark on the camera waterproof shell 300 and then inserted, at the moment, an outer buckle 121 of the wide-angle conversion lens 100 penetrates through a positioning block 302 and an inner snap ring 301, and the positioning block 302 limits the circular motion of the wide-angle conversion lens 100; and then, the locking knob 304 is pushed to move clockwise to the top dead center to drive the inner snap ring 301 to rotate clockwise or anticlockwise for a certain angle, so that the inner snap ring 303 and the outer snap ring 121 are overlapped in the axial direction to form a locking state, and at the moment, the sealing element 122 is extruded between the wide-angle conversion lens 100 and the camera waterproof shell 300 to realize sealing and waterproofing. During disassembly, the locking knob 304 is pushed to move to the lower dead point anticlockwise, the inner clamping ring 301 rotates, the inner clamping buckle 303 is separated from the outer clamping buckle 121, and finally the wide-angle conversion lens 100 is pulled out.

In this embodiment, the sealing member 122 is an O-ring having elastic deformation capability, the end of the connection end of the lens barrel housing 10 is provided with an annular groove 13, specifically, the connection ring 12 is mounted on the axial end surface of the annular groove 13 by a screw, wherein the axial end surface of the annular groove 13 is the end surface of the connection end of the lens barrel housing 10, and the sealing member 122 is mounted in the annular groove 13. After the connection end of the lens barrel housing 10 is inserted into the end of the waterproof camera case 300 and fixed, the sealing member 122 is pressed between the annular groove 13 of the lens barrel housing 10 and the mounting inner hole of the waterproof camera case 300, and the sealing member 122 seals the gap between the lens barrel housing 10 and the waterproof camera case 300, finally forming a sealing connection. The lens barrel housing 10 and the inside of the waterproof camera case 300 form a sealed accommodation chamber 14, and the camera and the terrestrial wide-angle lens 200 are sealed in the accommodation chamber 14 on the waterproof camera case 300 side.

As shown in fig. 1, in the present embodiment, the lens assembly 20 includes a first lens 21, a second lens 22, a third lens 23, and a fourth lens 24, the first lens 21, the second lens 22, the third lens 23, and the fourth lens 24 are sequentially installed in the lens barrel housing 10, and the first lens 21, the second lens 22, the third lens 23, and the fourth lens 24 are aligned on the same optical axis. The first lens 21 is located at the front end, and the fourth lens 24 is located at the rear end, that is, the first lens 21 is far away from the connection end of the lens barrel housing 10, and the fourth lens 24 is close to the connection end of the lens barrel housing 10. The first lens 21 is connected to the lens barrel housing 10 in a sealing manner through an O-ring 211, the second lens 22 and the third lens 23 are located in the accommodating cavity 14 on the side of the lens barrel housing 10, and a corresponding limiting structure is provided in the accommodating cavity 14 for fixing the second lens 22, the third lens 23 and the fourth lens 24, for example, the limiting structure is an annular seat or a cylinder, which is not shown in fig. 1.

The first lens 21 is a meniscus lens, the first lens 21 mainly plays a role of waterproof, the first lens 21 is also called a waterproof cover, the first lens 21 can also set certain light parameters to assist other lenses to image, the incident surface of the first lens 21 is a convex surface, and the emergent surface is a concave surface. The second lens 22 is a negative lens, and the incident surface and the exit surface of the second lens 22 are convex and concave, respectively. The third lens 23 is a negative lens, and the incident surface and the exit surface of the third lens 23 are concave and convex. The fourth lens 24 is a positive lens, and the incident surface and the exit surface of the fourth lens 24 are convex and concave, respectively.

As shown in fig. 4, the first lens 21, the second lens 22, the third lens 23 and the fourth lens 24 constitute a lens assembly 20 having functions of correcting chromatic aberration and enlarging an angle of view. The first lens 21, the second lens 22, the third lens 23 and the fourth lens 24 are overlapped with the optical axis of the land wide-angle lens 200 to form a wide-angle objective lens, so that a larger optical visual angle can be obtained, and a larger picture can be shot.

In order to realize better effects of correcting chromatic aberration and expanding a field of view, the first lens 21 is made of crown glass or organic glass with an Abbe number of 64-66 and a refractive index of 1.4-1.6; the second lens 22 is made of heavy lanthanum flint glass with Abbe number less than or equal to 42 and refractive index of 1.7-1.9, wherein the Abbe number is preferably 38-42, and the second lens 22 has the characteristics of high refractive index and large dispersion; the third lens 23 is made of heavy flint glass with Abbe number of 22-24 and refractive index of 1.7-1.9; the fourth lens 24 is made of heavy flint glass with an Abbe number of 24-28 and a refractive index of 1.6-1.8.

In this embodiment, in order to better fix the first lens 21, an annular seat 15 formed by extending in the radial direction is provided at the front end of the lens barrel housing 10, a surface of the first lens 21 facing the second lens 22 includes a concave surface in the middle and an annular flat surface located around the concave surface, wherein the concave surface is an exit surface of the first lens 21, the annular flat surface is a fixing and mounting surface of the first lens 21, the annular flat surface of the first lens 21 is attached to the annular seat 15 of the lens barrel housing 10, and the first lens 21 is connected with the lens barrel housing 10 in a sealing manner through an O-ring. The annular seat 15 and the first lens 21 block the front end of the lens barrel housing 10, and the annular seat 15 plays a role in limiting and water isolation.

In this embodiment, the accommodating cavity 14 of the lens barrel housing 10 expands radially to form a buoyancy cavity 16, the accommodating cavity 14 and the buoyancy cavity 16 are integrated cavities, and the buoyancy cavity 16 increases the buoyancy of the entire wide-angle conversion lens 100 in water. Preferably, the buoyancy chamber 16 has a predetermined volume, so that the buoyancy of the wide-angle conversion lens 100 in water is similar to the self weight, so that the wide-angle conversion lens 100 can maintain the gravity balance in water, the use burden of a photographer is reduced, and the shooting is more stable. Specifically, because the densities of the fresh water and the seawater are different, the wide-angle conversion lens 100 can also be divided into a fresh water applicable style and a seawater applicable style, and the sizes of the buoyancy chambers 16 of the fresh water applicable style and the seawater applicable style are slightly different, so that the buoyancy of the fresh water applicable style and the seawater applicable style in the fresh water and the seawater respectively are similar to the self gravity; in actual experience, the buoyancy difference between fresh water and seawater is not obvious, and a universal lens barrel shell 10 can be adopted.

In other embodiments, the buoyancy of the lens barrel housing 10 may be increased by attaching a float to the outside of the lens barrel housing 10.

In this embodiment, the incident surface and the exit surface of the first lens 21, the second lens 22, the third lens 23, and the fourth lens 24 are all plated with a broadband antireflection coating, so as to avoid the problem of internal reflection easily caused by using PMMA organic glass, and further improve the imaging quality.

In one embodiment, the optical parameters of the four lenses of lens assembly 20 are shown in Table 1 below:

TABLE 1

In the above table, the surface orders 1 to 8 are the incident surface and the emission surface of the first lens 21, the incident surface and the emission surface of the second lens 22, the incident surface and the emission surface of the third lens 23, and the incident surface and the emission surface of the fourth lens 24, respectively, in this order. The thickness, the refractive index and the abbe number of the same column of the order 1 represent the thickness, the refractive index and the abbe number on the optical axis of the first lens 21; the thickness of the same column in order 2 represents the distance on the optical axis between the first lens 21 and the second lens 22; the thickness, refractive index and abbe number of the same column of order 3 represent the thickness, refractive index and abbe number on the optical axis of the second lens 22; the thickness of the same column of the order 4 represents the distance on the optical axis between the second lens 22 and the third lens 23; the thickness, refractive index and abbe number of the same column of the order 5 represent the thickness, refractive index and abbe number on the optical axis of the third lens 23; the thickness of the same column of the order 6 represents the distance on the optical axis between the third lens 23 and the fourth lens 24; the thickness, the refractive index and the abbe number of the same column of the order 7 represent the thickness, the refractive index and the abbe number on the optical axis of the fourth lens 24; the thickness of the same column in order 8 represents the distance on the optical axis between fourth lens 24 and the front lens of terrestrial wide-angle lens 200.

When the lens assembly 20 adopting the optical parameters is used with a terrestrial wide-angle lens with a maximum visual angle of 114 degrees, the combined visual angle under water is 140 degrees. Therefore, the wide-angle conversion lens 100 can increase the field angle of the terrestrial camera to obtain a larger shot image.

FIG. 10 is a chart of underwater photography using a Nikon Z7 camera and a 14-30 wide angle lens with a view angle of 114 degrees using a conventional optical dome and Imatest analysis for chromatic aberration.

The analysis position is the lower left corner #4, ca (area) ═ 2.56pixels ═ 0.067% of center-ROI dist.

FIG. 11 is a chart of underwater photography with a Nikon Z7 camera and a 14-30 wide angle lens using the wide angle conversion lens of this example and Imatest analysis for chromatic aberration, with a combined viewing angle of 140 degrees.

The analysis position is the lower left corner #4, ca (area) ═ 0.393pixels ═ 0.01% of center-ROI dist.

A Chromatic aberration area in pixels index representing a pixel value used by a Chromatic aberration channel from the highest to the lowest area of an analysis position; the larger the value, the more severe the color difference.

CA (area) as a percentage of the distance from the image center to the ROI: representing the color difference of the analyzed position and the percentage of pixels from the center of the image to the position. Generally, the chromatic aberration of the imaging system increases proportionally from the center to the edge.

The severity of the chromatic aberration can be determined by reference to published standards of imatest, as follows:

Severity of chromatic aberration

the above related matters, referred to themselveshttp://www.imatest.com/docs/sfr_chromatic/。

It can be seen that when the Nikon Z7 camera and the 14-30 wide-angle lens are used for underwater photography by using the traditional optical dome, the integral image chromatic aberration is in the range of 0.04-0.08, and the chromatic aberration is low; after the same camera and wide-angle lens are matched with the conversion lens of the lens component 20 using the optical parameters, the integral image chromatic aberration is within the range of 0-0.04 and can be ignored under the condition that the combined visual angle is enlarged to 140 degrees; therefore, the wide-angle conversion lens 100 can eliminate chromatic aberration caused by water or seawater, and obtain a higher-quality image.

As shown in fig. 2, in the present embodiment, the light shield 11 includes four independent blades 111, and the four blades 111 are respectively mounted on the outer circumference of the front end of the lens barrel housing 10. The two blades 111 located at the left and right positions are fixed to the barrel housing 10 by means of snap-fit or screws, and the two blades 111 located at the up and down positions are hinged to the barrel housing 10 by means of the hinge shaft 42. The two blades 111 located at the left and right positions are not turned over with respect to the barrel housing 10, and the two blades 111 located at the up and down positions can be simultaneously opened or closed with respect to the barrel housing 10. The lower parts of the two blades 111 at the left and right positions are outwards protruded, the bottoms of the two blades are hollowed out and the two blades are designed to be conformal with the handle 112, so that a reliable hand gripping position is provided for the carrying process.

In order to control the opening and closing of the two blades 111 located at the upper and lower positions, a blade opening and closing device is further mounted on the lens barrel housing 10, and the blade opening and closing device is composed of a swing link assembly 40, a transmission part 60 and a manual knob 50, wherein the swing link assembly 40 has two blades 111 located at the upper and lower positions, the two blades 111 located at the upper and lower positions are respectively connected with the transmission part 60 through the swing link assembly 40, and the transmission part 60 is connected with the manual knob 50, so that the manual knob 50 can simultaneously control the two blades 111 located at the upper and lower positions to be opened or closed simultaneously. For convenience of description, the blades 111 at the upper and lower positions are named as an upper blade 111 and a lower blade 111, and since the positions of the upper blade 111 and the lower blade 111 are symmetrical to each other and the connection relationship is the same, the connection relationship of the upper blade 111 in the following embodiments is described as an example.

As shown in fig. 5, the swing link assembly 40 includes a pin 41, a hinge shaft 42, a swing link 43, a rotation shaft 45, an elastic roller 46, and a bearing set 44. Both ends of the hinge shaft 42 are rigidly and fixedly connected with the upper blade 111, and the hinge shaft 42 is rotatably inserted into the lens barrel housing 10. The swing link 43 is disposed in the accommodating cavity of the lens barrel housing 10, and one end of the swing link 43 is vertically and fixedly connected with the middle position of the hinge shaft 42. Specifically, one end of the swing rod 43 is provided with a mounting hole, the hinge shaft 42 is arranged in the mounting hole of the swing rod 43 in a penetrating manner, and the pin 41 is arranged in the swing rod 43 and the hinge shaft 42 in a penetrating manner at the same time, so that the positioning and the connection of the swing rod 43 and the hinge shaft 42 are realized. The hinge shaft 42 is provided with one or more annular grooves in which O-rings are disposed, and the hinge shaft 42 is rotatably and sealingly connected to the lens barrel housing 10 by the provision of the O-rings. One end of the rotating shaft 45 is sleeved with an elastic roller 46, the other end is arranged in the swinging rod 43 through a bearing set 44, and the rotating shaft 45 is rotatably arranged relative to the swinging rod 43.

Therefore, the swing link assembly 40 can swing about the central axis of the hinge shaft 42 in conjunction with the hinge shaft 42 and the upper blade 111. Specifically, when the swing link assembly 40 swings counterclockwise, the upper blade 111 may swing/open outward in a linkage manner; otherwise, the upper blade 111 may be linked to swing/close inward.

As shown in fig. 6 and 7, the transmission member 60 includes a driving shaft 61, an O-ring 66, a driving gear 62, a driven ring gear 63, a flange 64, and a disc cam 65. The outer end of the driving shaft 61 is connected with the manual knob 50, the driving shaft 61 is rotatably arranged on the lens cone shell 10 in a penetrating way, an annular groove is arranged on the driving shaft 61, an O-shaped ring 66 is arranged in the annular groove, and the driving shaft 61 is hermetically connected with the lens cone shell 10 through the O-shaped ring 66. The inner end of the drive shaft 61 is connected to a drive gear 62. The lens barrel housing 10 has an inner flange 17 extending inward, on which a ring groove 171 is formed; the driven gear ring 63 is of an annular structure, the driven gear ring 63 is installed in the annular groove 171 and locked through the flange 64, a section of conical tooth shape meshed with the driving gear 62 is arranged on the exposed axial surface of the driven gear ring 63, and the upper side and the lower side of the driven gear ring 63 are respectively provided with a disc-shaped cam block 65.

Further, the elastic roller 46 is simultaneously arranged in a guide groove 651 of the disc cam block 65, the guide groove 651 has a certain wrap angle in the circumferential direction, and the radius of the middle section is changed to generate a lift. When the cam disk 65 rotates along the center, the elastic roller 46 will roll along the arc surface of one side of the guide groove 651, and link the swing link assembly 40 and the upper blade 111 to swing around the hinge center. The guide grooves 651 terminate in pockets 652/653 and provide a preload to the resilient roller 46 to eliminate assembly errors and self-locking forces.

Limiting rods 431 are further arranged on two sides of the swing rod 43, the limiting rods 431 are connected with limiting blocks 48 through tension springs 47, and the limiting blocks 48 are mounted on the end face of the flange 64 and locked on the inner flange 17. The tension generated by the tension spring 47 will force the elastic roller 46 to always be engaged with one side of the guide groove 651 through the swing link 43, so as to eliminate the assembly/movement gap between the two. When the upper blade 111 is in a lower closed state, the limiting rod 431 is abutted against the inner wall of the lens barrel housing 10 for limiting; on the contrary, when the upper blade 111 is in the opened state, the limiting rod 431 is abutted against one side of the limiting block 48 for limiting, so as to protect the inner structure from being damaged by accidental impact.

Fig. 8 shows the upper blade 111 in the open position, where the resilient roller 46 is self-locking in the recess 652.

Fig. 9 shows the upper blade 111 in a closed position, in which the resilient roller 46 is self-locked in the recess 653.

In summary, when the manual knob 50 is rotated, the transmission part 60 can simultaneously drive the upper blade 111 and the lower blade 111 to simultaneously complete the opening or closing actions through the two linked swing rod assemblies 40, and self-locking and mechanical limiting are completed. This will help to minimize the overall diameter of the lens converter of the present invention, so that the user can selectively open or close the upper and lower leaves as desired. For example, when the combined viewing angle is larger than 130 degrees, the upper and lower blades are opened to prevent the image from generating a black angle, and to block the halo generated by the stray light and protect the lens assembly from accidental collision.

In the wide-angle conversion lens for correcting underwater chromatic aberration and enlarging the lens viewing angle provided by the embodiment, because four lenses are installed in the lens barrel housing 10, two of the four lenses are negative lenses, and one of the four lenses is a positive lens, the lens assembly 20 can correct chromatic aberration caused during underwater shooting, and the image quality is improved; the four lenses form a wide-angle objective lens, so that the optical visual angle is enlarged, and a camera can be assisted to shoot a wider range of images underwater; the lens hood and the lens cone shell of the embodiment are designed in a split mode, the upper piece and the lower piece are of swing structures, the lens hood is opened outwards when in use, and the lens hood is closed inwards when not in use, so that the overall size is effectively reduced; moreover, the black angle of the image can be avoided, the halation caused by stray light can be blocked, and the lens component can be protected from accidental collision. In addition, the connecting end of the lens barrel housing 10 is provided with the connecting member 12 and the sealing member 122, so that the wide-angle conversion lens 100 can be directly and rapidly connected with the waterproof camera housing 300 on the land in a sealing manner, and the wide-angle conversion lens 100 is more convenient to disassemble and assemble.

The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.

Claims (8)

1. The utility model provides a correct wide angle conversion camera lens of chromatic aberration under water and enlarge camera lens visual angle, comprises lens cone shell, lens subassembly and lens hood, its characterized in that:

the connecting end of the lens cone shell is provided with a connecting piece and a sealing piece which are used for rotating and quickly disassembling, the connecting piece is used for being connected with the camera waterproof shell, and the sealing piece is used for sealing a gap between the lens cone shell and the camera waterproof shell; a camera and a wide-angle lens are arranged in the camera waterproof shell;

the lens assembly comprises a first lens, a second lens, a third lens and a fourth lens which are coaxially mounted in the lens cone shell in sequence, the first lens is far away from the connecting end of the lens cone shell, the fourth lens is close to the connecting end of the lens cone shell, the first lens is hermetically connected with the lens cone shell, a sealed accommodating cavity is formed in the lens cone shell under the state that the lens cone shell is connected with the waterproof camera shell, and the second lens, the third lens and the fourth lens are located in the accommodating cavity; the first lens is a waterproof lens, the second lens and the third lens are negative lenses, and the fourth lens is a positive lens;

the lens hood comprises four blades, the left, right, upper and lower positions of the object side end of the lens cone shell are respectively provided with one blade, the blades positioned at the left and right positions are fixed on the lens cone shell, and the blades positioned at the upper and lower positions are respectively hinged on the lens cone shell through a hinge shaft; the hinge shaft is fixedly connected with the blades and rotatably penetrates through the lens cone shell, and the hinge shaft is in sealing connection with the lens cone shell; the lens cone shell is further provided with a manual knob, a gear transmission part and swing rod assemblies are arranged in the lens cone shell, the manual knob is connected with the gear transmission part, the gear transmission part is respectively connected with the hinge shafts through the two swing rod assemblies, one of the swing rod assemblies is correspondingly connected with one of the hinge shafts, and the manual knob sequentially controls the blades located at the upper position and the lower position to be opened or closed simultaneously through the gear transmission part and the swing rod assemblies.

2. A wide angle conversion lens for correcting underwater color difference and enlarging the angle of view of the lens barrel as claimed in claim 1, wherein the coupling end of the lens barrel housing is provided with an axial annular groove, and the sealing member is a packing ring and is mounted in the annular groove.

3. A wide angle conversion lens for correcting underwater chromatic aberration and enlarging a lens viewing angle as claimed in claim 1, wherein the connection member is a connection ring installed on an end surface of the connection end of the barrel housing or the connection ring is integrally formed on the end surface of the connection end of the barrel housing; the outer circumference of the connecting ring is provided with a plurality of outer buckles which are uniformly distributed, and the outer buckles are matched with the inner buckles of the camera waterproof shell.

4. A wide-angle conversion lens for correcting underwater chromatic aberration and enlarging a lens angle of view as claimed in claim 1, wherein an incident surface of the second lens is a convex surface, an exit surface is a concave surface, and an incident surface of the third lens is a concave surface, and an exit surface is a convex surface; the incident surface of the fourth lens is a convex surface, and the emergent surface of the fourth lens is a concave surface.

5. A wide conversion lens for correcting underwater chromatic aberration and enlarging a lens angle of view as claimed in claim 1, wherein the second lens has an Abbe number of 38 to 42, the third lens has an Abbe number of 22 to 24, and the fourth lens has an Abbe number of 24 to 28.

6. A wide conversion lens for correcting underwater chromatic aberration and enlarging a lens angle of view as claimed in claim 1, wherein the second lens has a refractive index of 1.7 to 1.9, the third lens has a refractive index of 1.7 to 1.9, and the fourth lens has a refractive index of 1.6 to 1.8.

7. A wide angle conversion lens for correcting underwater chromatic aberration and enlarging a lens angle of view as claimed in claim 1, wherein a surface of the first lens, the second lens, the third lens and the fourth lens is attached with a broadband antireflection coating.

8. A wide-angle conversion lens for correcting underwater chromatic aberration and enlarging a lens viewing angle as claimed in claim 1, wherein the accommodation chamber of the lens barrel housing is expanded to form a buoyancy chamber, and the buoyancy chamber generates buoyancy under water to offset a weight of the wide-angle conversion lens itself.

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