CN108693627B - Small-size high-resolution short-focal-length line scanning lens - Google Patents
Small-size high-resolution short-focal-length line scanning lens Download PDFInfo
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- CN108693627B CN108693627B CN201710219023.5A CN201710219023A CN108693627B CN 108693627 B CN108693627 B CN 108693627B CN 201710219023 A CN201710219023 A CN 201710219023A CN 108693627 B CN108693627 B CN 108693627B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
Abstract
The invention discloses a small-size high-resolution short-focal-length line scanning lens, which comprises a first lens group, a second lens group and a third lens group, wherein the first lens group is positioned on the left side of the second lens group, the second lens group is positioned on the left side of the third lens group, and a diaphragm is arranged between the second lens group and the third lens group; the first lens group includes a first lens group and a second lens, the second lens group includes a third lens and a fourth lens group, the fourth lens group includes a fourth lens and a fifth lens, and the third lens group includes a sixth lens and a seventh lens. The invention achieves the purpose of focusing by adjusting the first lens group, the second lens group, the third lens group and the diaphragm to move together along the optical axis direction, and realizes that clear imaging can be realized when the working distance is 200mm-1000 mm.
Description
Technical Field
The invention relates to a line scanning lens, in particular to a line scanning lens with small volume, high resolution and short focal length.
Background
Line scanning has been widely used in the fields of industrial inspection in the fields of printing inspection, check scanning, electronic product manufacturing, food sorting, transportation security, and the like. The selection of the line scanning imaging lens depends on the requirements of performance and cost, and an important parameter is the volume of the device, the volume of the device is mainly determined by the optical parameter focal length of the lens, the longer the focal length is, the larger the working distance is, the shorter the focal length is, the smaller the working distance is, and therefore the purpose of developing a line scanning lens with small volume, high resolution and short focal length is to reduce the volume of the device.
Disclosure of Invention
The present invention is directed to a small-sized line-scan lens with high resolution and short focal length, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a small-size line scanning lens with high resolution and short focal length comprises a first lens group, a second lens group and a third lens group, wherein the first lens group is positioned on the left side of the second lens group, the second lens group is positioned on the left side of the third lens group, and a diaphragm is arranged between the second lens group and the third lens group; the first lens group includes a first lens and a second lens, the second lens group includes a third lens and a fourth lens group, the fourth lens group includes a fourth lens and a fifth lens, and the third lens group includes a sixth lens and a seventh lens; the first lens, the fifth lens and the seventh lens are all lenses with negative refractive power, the second lens, the third lens, the fourth lens and the sixth lens are all lenses with positive refractive power, and focal lengths of the first lens group, the second lens group and the third lens group meet the following conditional expressions:
2﹤∣fl/f2| < 5 (formula 1);
0.5﹤∣f3/f1| 1.5 (formula 2);
0.1﹤∣f0/f1| 0.5 (formula 3);
wherein f is1Representing the focal length of the first lens group, f2Representing the focal length of the second lens group, f3Represents a third lens group, f0Representing the focal length of the entire lens.
As a further scheme of the invention: focal length f of the whole lens0The following conditional expressions are satisfied:
1﹤2Ymax/f0below 2 (formula 4);
wherein 2YmaxRepresenting the maximum real image height.
As a further scheme of the invention: the diaphragm is fixed along the direction of the optical axis.
As a further scheme of the invention: the first lens group and the third lens group have negative refractive power, and the second lens group has positive refractive power.
As a still further scheme of the invention: the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all formed by combining spherical lenses.
Compared with the prior art, the invention has the beneficial effects that:
the invention achieves the purpose of focusing by adjusting the first lens group, the second lens group, the third lens group and the diaphragm to move together along the optical axis direction, and realizes that clear imaging can be realized when the working distance is 200mm-1000 mm.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Referring to fig. 1, a small-sized line-scan lens with high resolution and short focal length includes a first lens group, a second lens group and a third lens group, the first lens group is located on the left side of the second lens group, the second lens group is located on the left side of the third lens group, and a diaphragm 8 is arranged between the second lens group and the third lens group; the first lens group includes a first lens 1 and a second lens 2, the second lens group includes a third lens 3 and a fourth lens group, the fourth lens group includes a fourth lens 4 and a fifth lens 5, and the third lens group includes a sixth lens 6 and a seventh lens 7; the focal lengths of the first lens group, the second lens group and the third lens group satisfy the following conditional expressions:
2﹤∣fl/f2| < 5 (formula 1);
0.5﹤∣f3/f1| 1.5 (formula 2);
0.1﹤∣f0/f1| 0.5 (formula 3);
wherein f is1Representing the focal length of the first lens group, f2Representing the focal length of the second lens group, f3Represents a third lens group, f0Representing the focal length of the entire lens.
Focal length f of the whole lens0The following conditional expressions are satisfied:
1﹤2Ymax/f0below 2 (formula 4);
wherein 2YmaxRepresenting the maximum real image height.
The diaphragm 8 is fixed in the optical axis direction.
The first lens group and the third lens group have negative refractive power, and the second lens group has positive refractive power.
The first lens 1, the fifth lens 5 and the seventh lens 7 are all lenses with negative refractive power.
The second lens 2, the third lens 3, the fourth lens 4 and the sixth lens 6 are all lenses with positive refractive power.
The first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6 and the seventh lens 7 are all formed by combining spherical lenses.
The specific implementation data of the small-size high-resolution short-focal-length line scanning lens is shown in table 1:
focal length is 20mm, image height is 30mm, aperture is 4.5, multiplying power range is 0.1-0.02, and back focal variation range is 13.1-14.7;
TABLE 1
As can be seen from Table 1, the present invention achieves a focal length of 20mm, and achieves the purpose of imaging with a working distance (200 mm-1000 mm) by adjusting the first lens group, the second lens group and the third lens group to move along the optical axis direction together with the diaphragm 8.
The invention achieves the purpose of focusing by adjusting the first lens group, the second lens group, the third lens group and the diaphragm to move together along the optical axis direction, and realizes that clear imaging can be realized when the working distance is 200mm-1000 mm.
Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.
Claims (5)
1. The line scanning lens with small volume, high resolution and short focal length is characterized by comprising a first lens group, a second lens group and a third lens group, wherein the first lens group is positioned on the left side of the second lens group, the second lens group is positioned on the left side of the third lens group, and a diaphragm is arranged between the second lens group and the third lens group; the first lens group consists of a first lens (1) and a second lens (2), the second lens group consists of a third lens (3) and a fourth lens group, the fourth lens group consists of a fourth lens (4) and a fifth lens (5), and the third lens group consists of a sixth lens (6) and a seventh lens (7); the first lens (1), the fifth lens (5) and the seventh lens (7) are all lenses with negative refractive power, the second lens (2), the third lens (3), the fourth lens (4) and the sixth lens (6) are all lenses with positive refractive power, and focal lengths of the first lens group, the second lens group and the third lens group meet the following conditional expressions:
2﹤∣fl/f2| < 5 (formula 1);
0.5﹤∣f3/f1| 1.5 (formula 2);
0.1﹤∣f0/f1| 0.5 (formula 3);
wherein f is1Representing the focal length of the first lens group, f2Representing the focal length of the second lens group, f3Represents a third lens group, f0Representing the focal length of the entire lens.
2. The small-sized short-focal-length line-scan lens according to claim 1, wherein the focal length f of the entire lens is set to be shorter than that of the entire lens0The following conditional expressions are satisfied:
1﹤2Ymax/f0below 2 (formula 4);
wherein 2YmaxRepresenting the maximum real image height.
3. The small-sized high-resolution short-focal-length line-scan lens according to claim 1, wherein the diaphragm (8) is fixed in the optical axis direction.
4. The small-sized high-resolution short focal length line scan lens according to claim 1, wherein the first lens group and the third lens group have negative refractive power, and the second lens group has positive refractive power.
5. The small-sized high-resolution short-focal-length linear scanning lens according to claim 1, wherein the first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5), the sixth lens (6) and the seventh lens (7) are all formed by combining spherical lenses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710219023.5A CN108693627B (en) | 2017-04-06 | 2017-04-06 | Small-size high-resolution short-focal-length line scanning lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710219023.5A CN108693627B (en) | 2017-04-06 | 2017-04-06 | Small-size high-resolution short-focal-length line scanning lens |
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| Publication Number | Publication Date |
|---|---|
| CN108693627A CN108693627A (en) | 2018-10-23 |
| CN108693627B true CN108693627B (en) | 2020-11-13 |
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| CN201710219023.5A Active CN108693627B (en) | 2017-04-06 | 2017-04-06 | Small-size high-resolution short-focal-length line scanning lens |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3495623B2 (en) * | 1998-12-24 | 2004-02-09 | ペンタックス株式会社 | Zoom lens system |
| JP4639425B2 (en) * | 2000-04-05 | 2011-02-23 | 株式会社ニコン | Variable focal length lens system |
| JP2003315677A (en) * | 2002-04-19 | 2003-11-06 | Pentax Corp | Zoom lens system including wide angle |
| US7626768B2 (en) * | 2006-02-13 | 2009-12-01 | Casio Computer Co., Ltd. | Zoom lens and camera with zoom lens |
| CN202583580U (en) * | 2012-04-26 | 2012-12-05 | 杭州志达光电有限公司 | Scanning lens |
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| CN108693627A (en) | 2018-10-23 |
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Effective date of registration: 20211119 Address after: 410116 workshop 101, building 1, Jinhai Industrial Park, 177 Jinhai Road, Yuhua District, Changsha City, Hunan Province Patentee after: HUNAN CHIOPT OPTICAL TECHNOLOGY Co.,Ltd. Address before: 511400 2nd floor, No.1 Workshop, Jinshan Industrial Park, pengdizhuang, lirendong village, Nancun Town, Panyu District, Guangzhou City, Guangdong Province Patentee before: GUANGZHOU CHIOPT OPTOTECH Co.,Ltd. |