CN105259640A - Exchangeable type lens and mirrorless digital camera comprising same - Google Patents
Exchangeable type lens and mirrorless digital camera comprising same Download PDFInfo
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- CN105259640A CN105259640A CN201510745182.XA CN201510745182A CN105259640A CN 105259640 A CN105259640 A CN 105259640A CN 201510745182 A CN201510745182 A CN 201510745182A CN 105259640 A CN105259640 A CN 105259640A
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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
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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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The invention discloses an exchangeable type lens and a mirrorless digital camera comprising the same. The lens comprises a first lens group with a negative refractive index, a second lens group with a positive refractive index, and a third lens group with a negative refractive index, wherein the first lens group, the second lens group and the third lens group are arranged sequentially. The first lens group is located at a side close to an object space, and the third lens group is located at a side close to an image space. The lens provided by the invention is very large in aperture, and is good in imaging quality.
Description
Technical field
The present invention relates to phtographic lens technical field, be specifically related to a kind of interchangeable camera lens and comprise this camera lens without anti-digital camera, especially relate to a kind of without anti-digital camera super large aperture silent frame interchangeable lens.
Background technology
At present, a kind ofly can exchange camera lens, camera by LCD live view without anti-digital camera, because it has the advantages such as volume is little, lightweight compared to common slr camera, and compared to the advantage that conventional cards facility have pixel high, market share is more and more higher.
Without anti-digital camera owing to being a kind of emerging product, market is applicable to the interchangeable camera lens of this series products or fewer, and the existing aperture without anti-camera lens is all less, such as, camera lens is as shown in Figure 1 made up of nine pieces of lens, the maximum namely F2.0 of aperture of the camera lens of this focal length 35mm, so when taking under virtualization and the low light level, can be slightly not enough, image quality is poor, is not suitable for the application of high-end photography.
Summary of the invention
Therefore, the technical problem to be solved in the present invention be of the prior art when taking under virtualization and the low light level without anti-digital camera lens image quality poor.
For this reason, a kind of interchangeable camera lens of the present invention, comprises first lens combination with negative index of arranging in turn, second lens combination with positive refracting power and has the 3rd lens combination of negative index; Described first lens combination is positioned near object space side, and described 3rd lens combination is positioned near image side;
Wherein, meet the following conditions:
1≤|f
1|/f
w≤1.2
Wherein, f
1represent the focal length of described first lens combination, f
wrepresent the focal length of described interchangeable camera lens.
Preferably, described interchangeable camera lens also meets the following conditions:
0.7≤f
2/f
w≤1
Wherein, f
2represent the focal length of described second lens combination.
Preferably, described first lens combination comprises the first negative lens, the focal distance f of described first negative lens
11meet:
-42mm≤f
11≤-35mm。
Preferably, described second lens combination comprises the first positive lens, the second positive lens and first balsaming lens of arranging in turn; Described first positive lens is positioned near object space side, and described first balsaming lens is positioned near image side;
The focal distance f of described first positive lens
21meet: 60mm≤f
21≤ 65mm;
The focal distance f of described second positive lens
22meet: 35mm≤f
22≤ 45mm;
The focal distance f of described first balsaming lens
23meet :-155mm≤f
23≤-145mm.
Preferably, described first balsaming lens comprises the 3rd positive lens and the second negative lens; Described 3rd positive lens is positioned near object space side, and described second negative lens is positioned near image side.
Preferably, described 3rd lens combination comprises the 3rd negative lens, non-spherical lens group and second balsaming lens of arranging in turn; Described 3rd negative lens is positioned near object space side, and described second balsaming lens is positioned near image side;
The focal distance f of described 3rd negative lens
31meet :-75mm≤f
31≤-70mm;
The focal distance f of described second balsaming lens
32meet: 50mm≤f
32≤ 60mm.
Preferably, described non-spherical lens group comprises first non-spherical lens and the second non-spherical lens of arranging in turn; Described first non-spherical lens is positioned near object space side, and described second non-spherical lens is positioned near image side.
Preferably, described second balsaming lens comprises the 4th positive lens and the 4th negative lens of arranging in turn; Described 4th positive lens is positioned near object space side, and described 4th negative lens is positioned near image side.
Preferably, also aperture diaphragm is provided with between described second lens combination and the 3rd lens combination.
Preferably, described interchangeable camera lens is the interchangeable camera lens of focal length 35mm, aperture F1.2.
One of the present invention, without anti-digital camera, comprises above-mentioned interchangeable camera lens.
Technical solution of the present invention, tool has the following advantages:
1. the interchangeable camera lens that provides of the embodiment of the present invention, by adopting negative, positive, negative structural shape, making its structure compacter, and then reducing the volume of camera lens, alleviating the weight of camera lens, being specially adapted to without anti-digital camera.And by arranging 1≤| f
1|/f
w≤ 1.2, incident amount of light can be increased as much as possible when short focus, ensure the image that can obtain good imaging quality under virtualization and low light condition, meet the designing requirement of the super large aperture of interchangeable camera lens.
2. the interchangeable camera lens that provides of the embodiment of the present invention, by arranging 0.7≤f
2/ f
w≤ 1, and coordinate 1≤| f
1|/f
wthe setting of≤1.2, light beam can by incident beam reduced width after passing through first, second lens combination, thus obtain the less advantage that provides of volume for the structural design of follow-up imaging lens group (the 3rd lens combination), and also can meet the super large aperture designing requirement of interchangeable camera lens further, ensure that captured image has outstanding image quality and virtualization effect, thus improve image quality further.
3. the interchangeable camera lens that provides of the embodiment of the present invention, by adopting balsaming lens, can simplify the structure of camera lens further, to reduce its volume, alleviating its weight.By designing the scope of the first negative lens, the first positive lens, the second positive lens, the first balsaming lens, the 3rd negative lens, the second balsaming lens focal length, by cooperatively interacting between them, the aperture of camera lens can be expanded further, meet the designing requirement of wide-angle, super large aperture.The global design of this camera lens makes more excellent compared with the MTF performance of other similar camera lenses, and distortion, aberration etc. are all less, thus improve image quality further.
4. the interchangeable camera lens that provides of the embodiment of the present invention, by the cooperation of this positive and negative lens in balsaming lens, can correct paraxial spherical aberration, corrects aberration, further increases image quality.By introducing non-spherical lens, avoiding the larger spherical aberration produced because all adopting spherical mirror, thus improving image quality.
Accompanying drawing explanation
In order to be illustrated more clearly in the specific embodiment of the invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the lens structure schematic diagram of the anti-digital camera lens of list of the prior art;
Fig. 2 is the lens structure schematic diagram of a concrete example of interchangeable camera lens in the embodiment of the present invention 1;
Fig. 3 is the lens surface distribution schematic diagram of a concrete example of interchangeable camera lens in the embodiment of the present invention 1;
Fig. 4 is focal length 35mm, the MTF of the interchangeable camera lens of aperture F1.2 schemes;
Fig. 5 is the lateral chromatic aberration figure of interchangeable camera lens of focal length 35mm, aperture F1.2;
Fig. 6 is the relative exposure figure of interchangeable camera lens of focal length 35mm, aperture F1.2.
Reference numeral: I-the first lens combination, II-the second lens combination, III-three lens combination, 1-first negative lens, 2-first positive lens, 3-second positive lens, 4-the 3rd positive lens, 5-second negative lens, 6-the 3rd negative lens, 7-first non-spherical lens, 8-second non-spherical lens, 9-the 4th positive lens, 10-the 4th negative lens, 11-aperture diaphragm, 12-screen.
Embodiment
Be clearly and completely described technical scheme of the present invention below in conjunction with accompanying drawing, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In describing the invention, it should be noted that, orientation or the position relationship of the instruction such as term "left", "right" are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second ", " the 3rd " etc. only for describing object, and can not be interpreted as instruction or hint relative importance.
In addition, if below in the described different embodiment of the present invention involved technical characteristic do not form conflict each other and just can be combined with each other.
Embodiment 1
The present embodiment provides a kind of interchangeable camera lens, such as, be applicable to without anti-digital camera, and as shown in Figure 2, left is object space side, and right is image side, and light beam finally images in the screen 12 of right from left incidence.This camera lens comprise arrange in turn first lens combination I with negative index, there is the second lens combination II of positive refracting power and there is the 3rd lens combination III of negative index; Described first lens combination I is positioned near object space side, and described 3rd lens combination III is positioned near image side;
Wherein, meet the following conditions:
1≤|f
1|/f
w≤1.2
Wherein, f
1represent the focal length of described first lens combination I, f
wrepresent the focal length of described interchangeable camera lens.
Above-mentioned interchangeable camera lens, by adopting negative, positive, negative structural shape, making its structure compacter, and then reducing the volume of camera lens, alleviating the weight of camera lens, being specially adapted to without anti-digital camera.And by arranging 1≤| f
1|/f
w≤ 1.2, incident amount of light can be increased as much as possible when short focus, ensure the image that can obtain good imaging quality under virtualization and low light condition, meet the designing requirement of the super large aperture of interchangeable camera lens.
Preferably, above-mentioned interchangeable camera lens also meets the following conditions: 0.7≤f
2/ f
w≤ 1, wherein, f
2represent the focal length of described second lens combination II.By arranging 0.7≤f
2/ f
w≤ 1, and coordinate 1≤| f
1|/f
wthe setting of≤1.2, light beam can by incident beam reduced width after passing through first, second lens combination, thus obtain the less advantage that provides of volume for the structural design of follow-up imaging lens group (the 3rd lens combination), and also can meet the super large aperture designing requirement of interchangeable camera lens further, ensure that captured image has outstanding image quality and virtualization effect, thus improve image quality further.
Preferably, between the second lens combination II and the 3rd lens combination III, be also provided with aperture diaphragm 11, sharpness and the brightness of imaging can be improved.
Preferably, the first lens combination I of above-mentioned interchangeable camera lens comprises the first negative lens 1, second lens combination II and comprises first positive lens 2, second positive lens 3 and first balsaming lens of arranging in turn; First positive lens 2 is positioned near object space side, and the first balsaming lens is positioned near image side, and the 3rd lens combination III comprises the 3rd negative lens 6, non-spherical lens group and second balsaming lens of arranging in turn; 3rd negative lens 6 is positioned near object space side, and the second balsaming lens is positioned near image side.
The focal distance f of the first negative lens 1
11meet :-42mm≤f
11≤-35mm.
The focal distance f of the first positive lens 2
21meet: 60mm≤f
21≤ 65mm;
The focal distance f of the second positive lens 3
22meet: 35mm≤f
22≤ 45mm;
The focal distance f of the first balsaming lens
23meet :-155mm≤f
23≤-145mm;
The focal distance f of the 3rd negative lens 6
31meet :-75mm≤f
31≤-70mm;
The focal distance f of the second balsaming lens
32meet: 50mm≤f
32≤ 60mm.
The aspheric surface mode of the non-spherical lens in non-spherical lens group all can be represented by following formula:
Wherein, parameter R, K, AR4, AR6, AR8, AR10, AR12, AR14 are asphericity coefficient, the aspherical shape that can obtain as required and adjusting.
Above-mentioned interchangeable camera lens, by adopting balsaming lens, can simplify the structure of camera lens further, to reduce its volume, alleviating its weight.By designing the scope of the first negative lens, the first positive lens, the second positive lens, the first balsaming lens, the 3rd negative lens, the second balsaming lens focal length, by cooperatively interacting between them, the aperture of camera lens can be expanded further, meet the designing requirement of wide-angle, super large aperture.The global design of this camera lens makes more excellent compared with the MTF performance of other similar camera lenses, and distortion, aberration etc. are all less, thus improve image quality further.
Further preferably, the first balsaming lens comprises the 3rd positive lens 4 and the second negative lens 5; 3rd positive lens is positioned near object space side, and the second negative lens is positioned near image side.
Non-spherical lens group comprises first non-spherical lens 7 and second non-spherical lens 8 of arranging in turn; First non-spherical lens 7 is in close object space side, and the second non-spherical lens 8 is in close image side.
Second balsaming lens comprises the 4th positive lens 9 and the 4th negative lens 10 of arranging in turn; 4th positive lens 9 is in close object space side, and the 4th negative lens 10 is near image side.
Above-mentioned interchangeable camera lens, by the cooperation of this positive and negative lens in balsaming lens, can correct paraxial spherical aberration, corrects aberration, further increases image quality.By introducing non-spherical lens, avoiding the larger spherical aberration produced because all adopting spherical mirror, thus improving image quality.
To specifically introduce a kind of numerical example of above-mentioned interchangeable camera lens below, as shown in Figure 3, surface number is from left to right respectively r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, r13, r14, r15, r16, r17, r18, concrete numerical value is as shown in the table, unit: mm.
Material type in upper table is the material type in simulation software in glass storehouse, such as ZEMAX simulation software, and different material types embodies different refractive indexes.
The asphericity coefficient of the first non-spherical lens 7 is as shown in the table:
| Asphericity coefficient | r12 | r13 |
| R | -19.229±0.02 | -11.135±0.01 |
| K | -1 | -1 |
| AR4 | -8.6579e-005 | 1.3912e-004 |
| AR6 | 9.8817e-007 | 9.7332e-007 |
| AR8 | 3.6718e-008 | 3.0973e-009 |
| AR10 | -6.7101e-010 | -1.6643e-010 |
| AR12 | 4.6474e-012 | 1.153e-012 |
| AR14 | -1.1905e-014 | -2.1893e-015 |
The asphericity coefficient of the second non-spherical lens 8 is as shown in the table:
| Asphericity coefficient | r14 | r15 |
| R | -10.846±0.01 | -18.3104±0.02 |
| K | -1 | -1 |
| AR4 | 4.6888e-004 | 1.8256e-004 |
| AR6 | -2.1275e-006 | -2.1723e-006 |
| AR8 | -1.0835e-008 | 2.0109e-008 |
| AR10 | 2.1691e-010 | -1.2855e-010 |
| AR12 | -1.335e-012 | 4.6027e-013 |
| AR14 | 3.0364e-015 | -8.18164e-016 |
The focal length 35mm of above-mentioned interchangeable camera lens, aperture F1.2 are a kind of professional, high-end phtographic lenses of silent frame.It will be understood by those of skill in the art that the numerical example of the interchangeable camera lens of focal length 35mm, aperture F1.2 is not limited to above-mentioned numerical example, also can be realized the silent frame interchangeable camera lens of focal length 35mm, aperture F1.2 by other numerical examples.
As shown in Figure 4, the diagonal line half of definition CMOS useful area is maximum image height, being set to 1.0 visual fields, for measuring the spatial frequency of different image height, getting 0.8 visual field, 0.6 visual field, 0 visual field.The CMOS diagonal line half of the interchangeable camera lens of Fig. 4 mid-focal length 35mm, aperture F1.2 is 21.32mm, the i.e. image height of 1.0 visual fields, the image height of 0.8 visual field is 21.32 × 0.8=17.056mm, the image height of 0.6 visual field is 21.32 × 0.6=12.792mm, the image height of 0 visual field is 0mm, is CMOS central point.
As shown in Figure 5, the lateral chromatic aberration of the interchangeable camera lens blue light of focal length 35mm, aperture F1.2 is 0.0016mm, and the lateral chromatic aberration of ruddiness is 0.0048mm, and lateral chromatic aberration that is red, blue light is all very little and both differences are also very little, has excellent imaging characteristic.
As shown in Figure 6, the relative exposure at the edge of the interchangeable camera lens of focal length 35mm, aperture F1.2 reaches more than 10%, meets imaging performance requirement.
Embodiment 2
The present embodiment provides a kind of without anti-digital camera, comprises the interchangeable camera lens in embodiment 1.That applies this interchangeable camera lens has the high advantage of image quality without anti-digital camera, and there is super large aperture due to camera lens, captured image has outstanding virtualization effect, under low light environment, shutter speed can be improved, more easily shoot the photo of high-quality, be particularly suitable for professional photography and use.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among the protection domain of the invention.
Claims (11)
1. an interchangeable camera lens, is characterized in that, comprises first lens combination with negative index of arranging in turn, second lens combination with positive refracting power and has the 3rd lens combination of negative index; Described first lens combination is positioned near object space side, and described 3rd lens combination is positioned near image side;
Wherein, meet the following conditions:
1≤|f
1|/f
w≤1.2
Wherein, f
1represent the focal length of described first lens combination, f
wrepresent the focal length of described interchangeable camera lens.
2. interchangeable camera lens according to claim 1, is characterized in that, described interchangeable camera lens also meets the following conditions:
0.7≤f
2/f
w≤1
Wherein, f
2represent the focal length of described second lens combination.
3. interchangeable camera lens according to claim 1 and 2, is characterized in that, described first lens combination comprises the first negative lens, the focal distance f of described first negative lens
11meet:
-42mm≤f
11≤-35mm。
4. the interchangeable camera lens according to any one of claim 1-3, is characterized in that, described second lens combination comprises the first positive lens, the second positive lens and first balsaming lens of arranging in turn; Described first positive lens is positioned near object space side, and described first balsaming lens is positioned near image side;
The focal distance f of described first positive lens
21meet: 60mm≤f
21≤ 65mm;
The focal distance f of described second positive lens
22meet: 35mm≤f
22≤ 45mm;
The focal distance f of described first balsaming lens
23meet :-155mm≤f
23≤-145mm.
5. interchangeable camera lens according to claim 4, is characterized in that, described first balsaming lens comprises the 3rd positive lens and the second negative lens; Described 3rd positive lens is positioned near object space side, and described second negative lens is positioned near image side.
6. the interchangeable camera lens according to any one of claim 1-5, is characterized in that, described 3rd lens combination comprises the 3rd negative lens, non-spherical lens group and second balsaming lens of arranging in turn; Described 3rd negative lens is positioned near object space side, and described second balsaming lens is positioned near image side;
The focal distance f of described 3rd negative lens
31meet :-75mm≤f
31≤-70mm;
The focal distance f of described second balsaming lens
32meet: 50mm≤f
32≤ 60mm.
7. interchangeable camera lens according to claim 6, is characterized in that, described non-spherical lens group comprises first non-spherical lens and the second non-spherical lens of arranging in turn; Described first non-spherical lens is positioned near object space side, and described second non-spherical lens is positioned near image side.
8. the interchangeable camera lens according to claim 6 or 7, is characterized in that, described second balsaming lens comprises the 4th positive lens and the 4th negative lens of arranging in turn; Described 4th positive lens is positioned near object space side, and described 4th negative lens is positioned near image side.
9. the interchangeable camera lens according to any one of claim 1-8, is characterized in that, is also provided with aperture diaphragm between described second lens combination and the 3rd lens combination.
10. the interchangeable camera lens according to any one of claim 1-9, is characterized in that, described interchangeable camera lens is the interchangeable camera lens of focal length 35mm, aperture F1.2.
11. 1 kinds, without anti-digital camera, is characterized in that, comprise the interchangeable camera lens as described in any one of claim 1-10.
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|---|---|---|---|
| CN201510745182.XA CN105259640B (en) | 2015-11-03 | 2015-11-03 | A kind of interchangeable camera lens and including the camera lens without anti-digital camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510745182.XA CN105259640B (en) | 2015-11-03 | 2015-11-03 | A kind of interchangeable camera lens and including the camera lens without anti-digital camera |
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| Publication Number | Publication Date |
|---|---|
| CN105259640A true CN105259640A (en) | 2016-01-20 |
| CN105259640B CN105259640B (en) | 2018-06-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113703131A (en) * | 2021-07-19 | 2021-11-26 | 中国科学院福建物质结构研究所 | Full-frame single-lens reflex lens |
| US11372208B2 (en) | 2017-05-27 | 2022-06-28 | Zhejiang Sunny Optical Co., Ltd | Imaging lens assembly |
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| CN101164004A (en) * | 2005-04-22 | 2008-04-16 | 柯尼卡美能达精密光学株式会社 | Variable power optical system, imaging lens system and digital apparatus |
| CN102411195A (en) * | 2010-09-22 | 2012-04-11 | 株式会社尼康 | Imaging Lens, Optical Device Equipped With The Imaging Lens And Method Used For Manufacturing The Imaging Lens |
| CN205121049U (en) * | 2015-11-03 | 2016-03-30 | 中山市思锐摄影器材工业有限公司 | Commutative formula camera lens reaches no anti - digital camera including this camera lens |
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| CN101164004A (en) * | 2005-04-22 | 2008-04-16 | 柯尼卡美能达精密光学株式会社 | Variable power optical system, imaging lens system and digital apparatus |
| US20070188885A1 (en) * | 2006-02-13 | 2007-08-16 | Casio Computer Co., Ltd. | Zoom lens and camera with zoom lens |
| CN102411195A (en) * | 2010-09-22 | 2012-04-11 | 株式会社尼康 | Imaging Lens, Optical Device Equipped With The Imaging Lens And Method Used For Manufacturing The Imaging Lens |
| CN205121049U (en) * | 2015-11-03 | 2016-03-30 | 中山市思锐摄影器材工业有限公司 | Commutative formula camera lens reaches no anti - digital camera including this camera lens |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11372208B2 (en) | 2017-05-27 | 2022-06-28 | Zhejiang Sunny Optical Co., Ltd | Imaging lens assembly |
| CN113703131A (en) * | 2021-07-19 | 2021-11-26 | 中国科学院福建物质结构研究所 | Full-frame single-lens reflex lens |
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| Publication number | Publication date |
|---|---|
| CN105259640B (en) | 2018-06-01 |
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Effective date of registration: 20230407 Address after: 528458 Office on the 2nd floor of the Third Industrial Zone of Wugui Mountain, Zhongshan City, Guangdong Province (inside the factory building of Guangdong Sirui Optics Co., Ltd.) Patentee after: Zhongshan Sichuang Optoelectronic Technology Co.,Ltd. Address before: 528458 workshop, Wuguishan No.3 Industrial Zone, Zhongshan City, Guangdong Province Patentee before: GUANGDONG SIRUI OPTICAL Co.,Ltd. |