CN216083253U - Four-component zoom lens - Google Patents
Four-component zoom lens Download PDFInfo
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- CN216083253U CN216083253U CN202122752888.2U CN202122752888U CN216083253U CN 216083253 U CN216083253 U CN 216083253U CN 202122752888 U CN202122752888 U CN 202122752888U CN 216083253 U CN216083253 U CN 216083253U
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Abstract
The utility model discloses a four-component zoom lens, which comprises a main cylinder, a first fixed group, a zoom group, a second fixed group and a compensation group, wherein the main cylinder is provided with a first lens and a second lens; the main cylinder is of a hollow structure; the first fixed group comprises a first front mirror frame and a first fixed lens group, the first front mirror frame is arranged at the front end of the main cylinder, and the first fixed lens group is arranged in the first front mirror frame; the zooming group comprises a second front mirror frame and a zooming lens group, the second front mirror frame is arranged at the front part of the main barrel, and the zooming lens group is supported and arranged in the second front mirror frame; the second fixed group comprises a second fixed lens group which is supported and arranged in the main cylinder; the compensation group comprises a rear mirror frame and a compensation lens group, the rear mirror frame is installed at the rear end of the main cylinder, and the compensation lens group is installed in the rear mirror frame. The utility model can compress the total length of the lens on the basis of meeting the optical indexes such as high image quality and the like, so that the integral structure of the lens is more miniaturized.
Description
Technical Field
The utility model relates to the technical field of lenses, in particular to a four-component zoom lens.
Background
With the continuous expansion and extension of monitoring systems in various application fields, more and more security monitoring lenses are used in various occasions and various working environment mirrors, so that higher and higher requirements are provided for the pixel resolution, the working environment mirror temperature and the like of the security monitoring lenses.
In the existing 1/1.7' small-sized security monitoring lens in the focal length range of 8mm-32mm multiplied by 4, the optical index is limited by the factors of original optical design and structural design, so that in the monitoring lens in the market at present, the total length of the lens is often longer in order to realize high image quality, the TTL is generally between 80-90mm, the structural appearance of the lens is large and long, and the material cost is high; if the total length is less than 70mm, the optical sensitivity is extremely high, and the yield of the lens is low, so that mass production cannot be realized.
SUMMERY OF THE UTILITY MODEL
It is an object of the present invention to overcome the above-mentioned deficiencies of the prior art and to provide a four-component zoom lens.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a four-component zoom lens comprises a main cylinder, a first fixed group, a zoom group, a second fixed group and a compensation group;
the main cylinder is of a hollow structure, and the first fixed group, the zooming group, the second fixed group and the compensation group are sequentially arranged along the axis direction of the main cylinder;
the first fixed group comprises a first front mirror frame and a first fixed lens group, the first front mirror frame is arranged at the front end of the main cylinder, and the first fixed lens group is arranged in the first front mirror frame;
the zooming group comprises a second front mirror frame and a zooming lens group, the second front mirror frame is arranged at the front part of the main cylinder, and the zooming lens group is supported and arranged in the second front mirror frame;
the second fixed group comprises a second fixed lens group which is supported and arranged in the main cylinder;
the compensation group comprises a rear mirror frame and a compensation lens group, the rear mirror frame is installed at the rear end of the main cylinder, and the compensation lens group is installed in the rear mirror frame.
Preferably, the first fixed group further includes a front pressing ring, the front pressing ring is used for pressing the first fixed lens group, the first fixed lens group includes a first lens, a second lens and a third lens, the first lens has a negative refractive index, the second lens has a positive refractive index, the third lens has a positive refractive index, the first lens and the second lens are glued together, and the first lens, the second lens and the third lens are separated from each other and supported against each other.
Preferably, the front part of the main barrel is provided with at least one spiral front guide port along the circumferential direction, the zoom group further comprises a front focusing ring, the second front lens frame is accommodated in the main barrel, the second front lens frame is provided with at least one front guide block along the circumferential direction, the front guide block radially extends outwards into the front guide port, and the front focusing ring is sleeved at the front end of the main barrel and used for driving the second front lens frame to move back and forth relative to the main barrel.
Preferably, the variable power lens group includes a fourth lens element, a fifth lens element and a sixth lens element, the fourth lens element has a negative refractive index, the fifth lens element has a negative refractive index, the sixth lens element has a positive refractive index, and the fifth lens element and the sixth lens element are bonded together.
Preferably, the second fixed lens group includes a seventh lens element, an eighth lens element and a ninth lens element, the seventh lens element has a positive refractive index, the eighth lens element has a positive refractive index, the ninth lens element has a negative refractive index, the eighth lens element and the ninth lens element are bonded together, and the seventh lens element and the eighth lens element and the ninth lens element are spaced apart from each other and supported by each other.
Preferably, the rear part of the main barrel is provided with at least one rear guide port along the circumferential direction, the rear guide port is parallel to the axial direction of the main barrel, the compensation group further comprises a rear focusing ring, the rear lens frame is accommodated in the main barrel, the rear lens frame is provided with at least one rear guide block along the circumferential direction, the rear guide block radially extends outwards into the rear guide port, and the rear focusing ring is sleeved at the rear end of the main barrel and used for driving the rear lens frame to move back and forth relative to the main barrel.
Preferably, the compensation lens group includes a tenth lens element, an eleventh lens element, a twelfth lens element, a thirteenth lens element, a fourteenth lens element and a fifteenth lens element, the tenth lens element has a positive refractive index, the eleventh lens element has a positive refractive index, the twelfth lens element has a negative refractive index, the thirteenth lens element has a positive refractive index, the fourteenth lens element has a positive refractive index, the fifteenth lens element has a negative refractive index, and the twelfth lens element and the thirteenth lens element are cemented together.
Preferably, the eleventh lens is a glass aspheric lens.
Preferably, the rear frame is made of plastic.
After adopting the technical scheme, compared with the background technology, the utility model has the following advantages:
1. according to the utility model, the first fixed lens group is arranged at the front end of the main barrel, the second fixed lens group is arranged in the main barrel in a bearing manner, and the zoom group and the compensation group are arranged in the main barrel, so that the total length of the lens can be compressed on the basis of meeting optical indexes such as high image quality and the like, and the overall structure of the lens is more miniaturized.
2. According to the utility model, the second fixed lens group is directly supported in the main cylinder, and the compensation lens group is arranged on the plastic rear mirror frame.
3. The eleventh lens is an aspheric lens, the total length of the lens can be compressed by adding the aspheric lens, and the total length of the lens can be compressed to be within 65mm through optical optimization design and structural optimization design.
Drawings
FIG. 1 is a perspective view of the present invention;
FIG. 2 is an exploded view of the present invention;
FIG. 3 is a cross-sectional view of the present invention;
FIG. 4 is a schematic structural view of a main cartridge;
FIG. 5 is a schematic view of a lens assembly according to the present invention.
Description of reference numerals:
a main barrel 100, a front pilot port 110, a rear pilot port 120;
a first fixed group 200, a first front lens frame 210, a first fixed lens group 220, a first lens 221, a second lens 222, a third lens 223, a front pressing ring 230;
a zoom group 300, a second front mirror frame 310, a front guide block 311, a zoom lens group 320, a fourth lens 321, a fifth lens 322, a sixth lens 323 and a front focus ring 330;
a second fixed lens group 410, a seventh lens 411, an eighth lens 412, a ninth lens 413;
the lens comprises a compensation group 500, a rear lens frame 510, a rear guide block 511, a compensation lens group 520, a tenth lens 521, an eleventh lens 522, a twelfth lens 523, a thirteenth lens 524, a fourteenth lens 525, a fifteenth lens 526 and a rear focusing ring 530.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
In the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the apparatus or element of the present invention must have a specific orientation, and thus, should not be construed as limiting the present invention.
Examples
In the present specification, the term "a lens element having a positive refractive index (or a negative refractive index)" means that the paraxial refractive index of the lens element calculated by the gauss theory is positive (or negative). The term "object-side (or image-side) of a lens" is defined as the specific range of imaging light rays passing through the lens surface. The determination of the surface shape of the lens can be performed by the judgment method of a person skilled in the art, i.e., by the sign of the curvature radius (abbreviated as R value). The R value may be commonly used in optical design software, such as Ze max or Code V. The R value is also commonly found in lens data sheets (lens data sheets) of optical design software. When the R value is positive, the object side is judged to be a convex surface; and when the R value is negative, judging that the object side surface is a concave surface. On the contrary, regarding the image side surface, when the R value is positive, the image side surface is judged to be a concave surface; when the R value is negative, the image side surface is judged to be convex.
Referring to fig. 1, the present invention discloses a four-element zoom lens, including a main barrel 100, a first fixed group 200, a zoom group 300, a second fixed group and a compensation group 500;
the main cylinder 100 is a hollow structure, the first fixing group 200, the zooming group 300, the second fixing group and the compensating group 500 are sequentially arranged along the axial direction of the main cylinder 100, the front part of the main cylinder 100 is at least provided with a spiral front guide port 110 along the circumferential direction, the rear part of the main cylinder 100 is at least provided with a rear guide port 120 along the circumferential direction, and the rear guide port 120 is parallel to the axial direction of the main cylinder 100.
The first fixed group 200 includes a first front frame 210 and a first fixed lens group 220, the first front frame 210 is mounted to the front end of the main barrel 100, and the first fixed lens group 220 is mounted in the first front frame 210. The first fixed lens group 220 includes a first lens 221, a second lens 222 and a third lens 223, wherein the first lens 221 has a negative refractive index, the second lens 222 has a positive refractive index, the third lens 223 has a positive refractive index, the first lens 221 and the second lens 222 are bonded together, and the first lens 221, the second lens 222 and the third lens 223 are spaced apart from each other and supported by each other.
The variable power group 300 includes a second front frame 310 and a variable power lens group 320, the second front frame 310 is mounted to the front of the main barrel 100, and the variable power lens group 320 is mounted to the second front frame 310. The zoom group further comprises a front focusing ring 330, the second front lens frame 310 is accommodated in the main barrel 100, the second front lens frame 310 is at least provided with a front guide block 311 along the circumferential direction, the front guide block 311 radially extends outwards into the front guide opening 110, and the front focusing ring 330 is sleeved at the front end of the main barrel 100 and used for driving the second front lens frame 310 to move back and forth relative to the main barrel 100.
The variable power lens assembly 320 includes a fourth lens element 321, a fifth lens element 322 and a sixth lens element 323, wherein the fourth lens element 321 has a negative refractive index, the fifth lens element 322 has a negative refractive index, the sixth lens element 323 has a positive refractive index, and the fifth lens element 322 and the sixth lens element 323 are cemented together.
The second fixed group includes a second fixed lens group 410, and the second fixed lens group 410 is mounted in the main barrel 100. The second fixed lens group 410 includes a seventh lens element 411, an eighth lens element 412 and a ninth lens element 413, wherein the seventh lens element 411 has a positive refractive index, the eighth lens element 412 has a positive refractive index, the ninth lens element 413 has a negative refractive index, the eighth lens element 412 and the ninth lens element 413 are bonded together, and the seventh lens element 411, the eighth lens element 412 and the ninth lens element 413 are spaced apart from and supported by each other.
The compensation lens group 520 includes a tenth lens element 521, an eleventh lens element 522, a twelfth lens element 523, a thirteenth lens element 524, a fourteenth lens element 525 and a fifteenth lens element 526, wherein the tenth lens element 521 has a positive refractive index, the eleventh lens element 522 has a positive refractive index, the twelfth lens element 523 has a negative refractive index, the thirteenth lens element 524 has a positive refractive index, the fourteenth lens element 525 has a positive refractive index, the fifteenth lens element 526 has a negative refractive index, and the twelfth lens element 523 and the thirteenth lens element 524 are cemented together.
Detailed optical data of the present invention are shown in table 1.
Table 1 detailed optical data of the utility model
In the present invention, the eleventh lens 522 is a glass aspherical lens, and its aspherical surface coefficient is shown in the following table:
| number of noodles | S18 | S19 |
| K | 4.7 | 4.3 |
| A4 | 5.60E-05 | 8.34E-05 |
| A6 | 1.93E-07 | -1.61E-06 |
| A8 | -1.68E-08 | 5.22E-08 |
| A10 | 1.63E-09 | 5.52E-10 |
| A12 | -1.76E-11 | -2.32E-11 |
Through optical optimization design and structural optimization design, optical specifications are realized by a 14G1P optical structure: the image plane is 1/1.7', the focal length is 8.0mm-32.0mm, the F value is 1.9-2.5, and the TTL is 63.74mm, so that the 4MP high-end application is met.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A four-component zoom lens is characterized by comprising a main cylinder, a first fixed group, a zoom group, a second fixed group and a compensation group;
the main cylinder is of a hollow structure, and the first fixed group, the zooming group, the second fixed group and the compensation group are sequentially arranged along the axis direction of the main cylinder;
the first fixed group comprises a first front mirror frame and a first fixed lens group, the first front mirror frame is arranged at the front end of the main cylinder, and the first fixed lens group is arranged in the first front mirror frame;
the zooming group comprises a second front mirror frame and a zooming lens group, the second front mirror frame is arranged at the front part of the main cylinder, and the zooming lens group is supported and arranged in the second front mirror frame;
the second fixed group comprises a second fixed lens group which is supported and arranged in the main cylinder;
the compensation group comprises a rear mirror frame and a compensation lens group, the rear mirror frame is installed at the rear end of the main cylinder, and the compensation lens group is installed in the rear mirror frame.
2. The four-component zoom lens of claim 1, wherein the first fixed group further comprises a front pressing ring for pressing the first fixed lens group, the first fixed lens group comprises a first lens, a second lens and a third lens, the first lens has a negative refractive index, the second lens has a positive refractive index, the third lens has a positive refractive index, the first lens and the second lens are bonded together, and the first lens and the second lens and the third lens are spaced apart from each other and supported.
3. The four-component zoom lens as claimed in claim 1, wherein the front portion of the main barrel is provided with at least one spiral front guiding opening along a circumferential direction thereof, the zoom lens assembly further comprises a front focus ring, the second front lens frame is accommodated in the main barrel, the second front lens frame is provided with at least one front guiding block along the circumferential direction thereof, the front guiding block radially extends outwards into the front guiding opening, and the front focus ring is sleeved on the front end of the main barrel for driving the second front lens frame to move back and forth relative to the main barrel.
4. The quad-element zoom lens according to claim 3, wherein the variable power lens group comprises a fourth lens element, a fifth lens element and a sixth lens element, the fourth lens element has negative refractive power, the fifth lens element has negative refractive power, the sixth lens element has positive refractive power, and the fifth lens element and the sixth lens element are cemented together.
5. The quad-element zoom lens of claim 1, wherein the second fixed lens group comprises a seventh lens element, an eighth lens element and a ninth lens element, the seventh lens element has positive refractive power, the eighth lens element has positive refractive power, the ninth lens element has negative refractive power, the eighth lens element and the ninth lens element are bonded to each other, and the seventh lens element is spaced apart from and supported by the eighth lens element and the ninth lens element.
6. A four-component zoom lens as claimed in claim 1, wherein the rear portion of the main barrel is provided with at least one rear guide opening along a circumferential direction thereof, the rear guide opening being parallel to an axial direction of the main barrel, the compensation group further comprises a rear focus ring, the rear lens frame is accommodated in the main barrel, the rear lens frame is provided with at least one rear guide block along a circumferential direction thereof, the rear guide block radially outwardly extends into the rear guide opening, and the rear focus ring is sleeved on a rear end of the main barrel for driving the rear lens frame to move forward and backward relative to the main barrel.
7. The quad-element zoom lens of claim 6, wherein the compensation lens group comprises a tenth lens element, an eleventh lens element, a twelfth lens element, a thirteenth lens element, a fourteenth lens element and a fifteenth lens element, the tenth lens element has a positive refractive index, the eleventh lens element has a positive refractive index, the twelfth lens element has a negative refractive index, the thirteenth lens element has a positive refractive index, the fourteenth lens element has a positive refractive index, the fifteenth lens element has a negative refractive index, and the twelfth lens element and the thirteenth lens element are bonded together.
8. The four-component zoom lens according to claim 7, wherein the eleventh lens is a glass aspherical lens.
9. A four-component zoom lens according to claim 6, wherein said rear lens frame is made of plastic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122752888.2U CN216083253U (en) | 2021-11-11 | 2021-11-11 | Four-component zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122752888.2U CN216083253U (en) | 2021-11-11 | 2021-11-11 | Four-component zoom lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216083253U true CN216083253U (en) | 2022-03-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122752888.2U Active CN216083253U (en) | 2021-11-11 | 2021-11-11 | Four-component zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216083253U (en) |
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2021
- 2021-11-11 CN CN202122752888.2U patent/CN216083253U/en active Active
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