CN115291374B - Ultra-large target surface wide-object-distance compact type continuous zoom lens and imaging method thereof - Google Patents
Ultra-large target surface wide-object-distance compact type continuous zoom lens and imaging method thereof Download PDFInfo
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- CN115291374B CN115291374B CN202210839486.2A CN202210839486A CN115291374B CN 115291374 B CN115291374 B CN 115291374B CN 202210839486 A CN202210839486 A CN 202210839486A CN 115291374 B CN115291374 B CN 115291374B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
- G02B15/144105—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +-+-
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/173—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
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Abstract
The invention relates to an ultra-large target surface wide object distance compact type continuous zoom lens, which comprises a front group lens, a diaphragm C, a rear group lens and plate glass, wherein the front group lens, the diaphragm C, the rear group lens and the plate glass are sequentially arranged along the light incidence direction, the front group lens comprises a front fixed group A and a variable magnification group B, the rear group lens comprises a compensation group D and a rear fixed group E, the front fixed group comprises a meniscus negative lens A1, a meniscus positive lens A2 and a meniscus positive lens A3 which are sequentially arranged from left to right, and the variable magnification group B comprises a meniscus negative lens B1, a biconcave negative lens B2 and a meniscus positive lens B3 which are sequentially arranged from left to right; the compensation group D comprises a biconvex positive lens D1, a meniscus positive lens D2, a meniscus negative lens D3, a biconvex positive lens D4 and a meniscus positive lens D5 which are sequentially arranged from left to right; the rear fixed group E includes a meniscus negative lens E1, a meniscus positive lens E2, a meniscus negative lens E3, and a biconvex positive lens E4, which are sequentially arranged from left to right. The invention has reasonable design and compact structure, performs constraint correction on the aberration of each lens, realizes large target surface high-pixel imaging, ensures that the lens has a wide working distance range, realizes aberration balance of different focal lengths and different object distances through lens surface type optimization, and ensures that the lens has the capability of compactness and large target surface high-definition imaging.
Description
Technical Field
The invention relates to an ultra-large target surface wide-object-distance compact continuous zoom lens and an imaging method thereof.
Background
Along with the continuous improvement of the industrialization degree in China, the continuous zoom lens is widely applied to monitoring, detection and identification, precise instruments and various military vehicles, and the focal length and visual field adjusting capability of the zoom lens provides convenience for the picture detection process, so that lenses with different focal lengths do not need to be frequently replaced like fixed-focus lenses. However, the zoom lens is greatly larger in volume than the fixed focus lens due to the influence of the magnification adjustment mechanism. Meanwhile, because of the influence of off-axis aberration of different focal lengths and different object distances, the zoom lens cannot achieve high-definition imaging on a camera with a large target surface and cannot be matched with an oversized target surface high-pixel camera for use.
Disclosure of Invention
The invention improves the problems, namely the technical problem to be solved by the invention is to provide the ultra-large target surface wide object distance compact type continuous zoom lens and the imaging method thereof, which realize aberration balance of different focal lengths and different object distances and enable the lens to have the capability of compactness and large target surface high definition imaging.
The invention is composed of a front group lens, a diaphragm C, a rear group lens and a flat glass, wherein the front group lens, the diaphragm C, the rear group lens and the flat glass are sequentially arranged along the incidence direction of light rays, the front group lens comprises a front fixed group A and a variable magnification group B, the rear group lens comprises a compensation group D and a rear fixed group E, the front fixed group comprises a meniscus negative lens A1, a meniscus positive lens A2 and a meniscus positive lens A3 which are sequentially arranged from left to right, and the variable magnification group B comprises a meniscus negative lens B1, a biconcave negative lens B2 and a meniscus positive lens B3 which are sequentially arranged from left to right; the compensation group D comprises a biconvex positive lens D1, a meniscus positive lens D2, a meniscus negative lens D3, a biconvex positive lens D4 and a meniscus positive lens D5 which are sequentially arranged from left to right; the rear fixed group E includes a meniscus negative lens E1, a meniscus positive lens E2, a meniscus negative lens E3, and a biconvex positive lens E4, which are sequentially arranged from left to right.
Further, the front fixed group A, the variable magnification group B, the compensation group D and the rear fixed group E are all subjected to the correction of the complex chromatic aberration by adopting a closely-adhered cemented lens; in the front fixed group A, a first closely-adhered cemented lens is formed by a meniscus negative lens A1 and a meniscus positive lens A2; in the zoom group B, a biconcave negative lens B2 and a meniscus positive lens B3 form a second closely-adhered cemented lens; in the compensation group D, a meniscus negative lens D3 and a biconvex positive lens D4 constitute a third close-contact cemented lens; in the rear fixed group E, a positive meniscus lens E2 and a negative meniscus lens E3 constitute a fourth adhesion cemented lens.
Further, the air distance from the first closely-adhered cemented lens to the meniscus positive lens A3 is 0.1mm; the air distance from the positive meniscus lens A3 to the negative meniscus lens B1 is variable, and the range is 1.88 mm-16.86 mm; the air distance from the meniscus negative lens B1 to the second close-contact bonding lens is 6.56mm, the distance from the second close-contact bonding lens to the diaphragm C is variable, the range is 4.09 mm-20.63 mm, the air distance from the diaphragm C to the biconvex positive lens D1 is 1mm, the air distance from the biconvex positive lens D1 to the meniscus positive lens D2 is 0.1mm, the air distance from the meniscus positive lens D2 to the third close-contact bonding lens is 5.08mm, and the air distance from the third close-contact bonding lens to the meniscus positive lens D5 is 0.1mm; the air distance from the positive meniscus lens D5 to the negative meniscus lens E1 is variable: the range is 1.44-5.32 mm; the air distance from the meniscus negative lens E1 to the fourth closely-adhered cemented lens is 4.33mm; the air distance from the fourth closely-adhered cemented lens to the biconvex positive lens E4 is 0.12mm; the air distance from the biconvex positive lens E4 to the plate glass is 18mm; the air distance from the plate glass to the image plane was 0.1mm.
Further, the focal power of the front fixed group A in the front group of lenses is positive, and the focal power of the variable-power group B in the front group of lenses is negative; the optical power of the compensation group D in the rear group lens is positive, and the optical power of the rear fixing group E in the rear group lens is negative.
Further, the focal length F of the zoom group B B And wide-angle end focal length F W The ratio of (2) satisfies the relation: -0.85 < F B /F W ＜-0.75。
Further, the bonding surface of the first closely-bonded bonding lens in the front fixed group A is bent to one side of the diaphragm C; the bonding surface of the second closely-adhered bonding lens in the zoom group B is bent to one side of the diaphragm C; the bonding surface of the third closely-adhered bonding lens in the compensation group D faces away from the side of the diaphragm C, and the focal length F of the third closely-adhered bonding lens 3 And a wide-angle end focal length F W The ratio of (2) satisfies the relation: -3.4 < F 3 /F W -2.8; the bonding surface of the fourth closely-adhered bonding lens in the rear fixing group E is bent to one side of the diaphragm, and the focal length F of the fourth closely-adhered bonding lens 4 And a wide-angle end focal length F W The ratio of (2) satisfies the relation: -2.5 < F 4 /F W ＜-2.1。
Further, the left R value of the negative meniscus lens A1 in the front fixed group A satisfies 67.5 < R < 69.3, the right R value of the negative meniscus lens A1 satisfies 40.1 < R < 41.8, and the thickness of the lens is 2.20mm; the left R value of the positive meniscus lens A2 is more than 40.1 and less than 41.8, the right R value of the positive meniscus lens A2 is more than 230.5 and less than 235.5, and the thickness of the lens is 7.96mm; the left R value of the positive meniscus lens A3 is more than 46.5 and less than 47.8, the right R value of the positive meniscus lens A3 is more than 154.2 and less than 156.8, and the thickness of the lens is 4.79mm; the R value of the left surface of the negative meniscus lens B1 in the zoom group B is 732.5 < R < 738.9, the R value of the right surface of the negative meniscus lens B1 is 13.3 < R < 14.6, and the thickness of the lens is 1.00mm; the left R value of the biconcave negative lens B2 is more than-39.8 and less than-38.5, the right R value of the biconcave negative lens B2 is more than 19.5 and less than 20.4, and the thickness of the lens is 1.00mm; the left R value of the positive meniscus lens B3 is more than 19.5 and less than 20.4, the right R value of the positive meniscus lens B3 is more than 84.1 and less than 85.6, and the thickness of the lens is 3.17mm; the R value at the left side of the biconvex positive lens D1 in the compensation group D is more than 49.8 and less than 52.8, the R value at the right side of the biconvex positive lens D1 is more than-117.1 and less than-109.7, and the thickness of the lens is 1.36mm; the left R value of the positive meniscus lens D2 is more than 11.9 and less than 13.7, the right R value of the positive meniscus lens D2 is more than 19.4 and less than 22.6, and the thickness of the lens is 1.48mm; the left R value of the negative meniscus lens D3 is more than 41.5 and less than 44.2, the right R value of the negative meniscus lens D3 is more than 9.2 and less than 10.8, and the thickness of the lens is 1.00mm; the R value of the left surface of the biconvex positive lens D4 is more than 9.2 and less than 10.8, the R value of the right surface of the biconvex positive lens D4 is more than-60.9 and less than-57.6, and the thickness of the lens is 3.11mm; the left R value of the positive meniscus lens D5 is 16.5 < R < 18.1, the right R value of the positive meniscus lens D5 is 96.1 < R < 108.4, and the thickness of the lens is 2.06mm; the left R value of the negative meniscus lens E1 in the rear fixed group E is more than 61.5 and less than 66.8, the right R value of the negative meniscus lens E1 is more than 14.8 and less than 16.1, and the thickness of the lens is 1.00mm; the left R value of the positive meniscus lens E2 is more than-11.7 and less than-10.2, the right R value of the positive meniscus lens E2 is more than-8.7 and less than-7.8, and the thickness of the lens is 3.68mm; the left R value of the negative meniscus lens E3 is more than-8.7 and less than-7.8, the right R value of the negative meniscus lens E3 is more than-15.2 and less than-14.2, and the thickness of the lens is 1.00mm; the left R value of the biconvex positive lens E4 is more than 109.5 and less than 115.8, the right R value of the biconvex positive lens E4 is more than-28.6 and less than-26.8, and the thickness of the lens is 5.06mm.
Furthermore, the first closely-adhered bonding lens adopts a combination of heavy flint glass and lanthanum crown glass with larger dispersion coefficient difference so as to effectively reduce chromatic aberration; the second closely-adhered cemented lens adopts a combination of dense phosphorus crown glass and dense flint glass with large refractive index difference and large dispersion coefficient difference; the third closely-adhered cemented lens adopts a combination of dense phosphorus crown glass and dense flint glass with large difference of refractive index and dispersion coefficient; and the fourth closely-adhered cemented lens adopts a combination of crown flint glass and lanthanum crown glass with relatively close dispersion coefficients to balance the off-axis aberration of the ultra-large target surface light.
Further, in the imaging method of the ultra-large target surface wide-object-distance compact type continuous zoom lens, light rays sequentially pass through the meniscus negative lens A1, the meniscus positive lens A2, the meniscus positive lens A3, the meniscus negative lens B1, the biconcave negative lens B2, the meniscus positive lens B3, the biconvex positive lens D1, the meniscus positive lens D2, the meniscus negative lens D3, the biconvex positive lens D4, the meniscus positive lens D5, the meniscus negative lens E1, the meniscus positive lens E2, the meniscus negative lens E3 and the biconvex positive lens E4 from left to right and then are imaged.
Further, in the front group lens, a front fixed group A formed by a meniscus negative lens A1, a meniscus positive lens A2 and a meniscus positive lens A3 keeps a static state relative to an image surface in the zooming and focusing processes; the zoom group B formed by the meniscus negative lens B1, the biconcave negative lens B2 and the meniscus positive lens B3 moves left and right relative to the image plane in the zooming process so as to achieve the purpose of continuous zooming; in the rear group lens, a compensation group D formed by a biconvex positive lens D1, a meniscus positive lens D2, a meniscus negative lens D3, a biconvex positive lens D4 and a meniscus positive lens D5 moves left and right relative to an image surface in a focusing process to focus so as to compensate rear focus and aberration changes introduced in a zooming process; the rear fixed group E formed by the meniscus negative lens E1, the meniscus positive lens E2, the meniscus negative lens E3 and the biconvex positive lens E4 keeps a static state relative to an image surface in the zooming and focusing processes; in the continuous zooming process, the variable magnification group B formed by the meniscus negative lens B1, the biconcave negative lens B2 and the meniscus positive lens B3 can perform focusing compensation on different object distances under the same focal length while the compensation group D formed by the biconvex positive lens D1, the meniscus positive lens D2, the meniscus negative lens D3, the biconvex positive lens D4 and the meniscus positive lens D5 performs focusing compensation on the whole zooming process.
Compared with the prior art, the invention has the following beneficial effects:
1. through the image quality balance optimization of the lens dynamic process, the compensation group D formed by the biconvex positive lens D1, the meniscus positive lens D2, the meniscus negative lens D3, the biconvex positive lens D4 and the meniscus positive lens D5 can not only carry out focusing compensation on the whole zooming process, but also carry out focusing compensation on different shooting distances under the same focal length, so that the purpose of wide object distance detection is realized, and compared with a micro compensation mechanism of a front fixed group A adopted by a traditional zoom lens, the lens has more excellent resolution and widens the use scene of the lens.
2. The rear fixed group E of the lens adopts a low-focal-power structural form, and the incident angle of the light rays with large target surfaces is controlled by optimally controlling the focal powers of the variable-power group B and the compensation group D, so that the volume of the lens is further reduced, and the compactness is realized. Meanwhile, the reasonable four-component focal power distribution and material collocation selection enable the lens to have a passive athermalization function.
3. The zoom lens adopts a four-component structure form, and realizes aberration balance of different focal lengths and different object distances through lens surface type optimization, so that the lens has the capabilities of compactness and large target surface high-definition imaging.
Drawings
FIG. 1 is a schematic view of a short focal path according to an embodiment of the present invention;
FIG. 2 is a schematic view of a sub-focus optical path according to an embodiment of the present invention;
FIG. 3 is a schematic view of a tele path according to an embodiment of the present invention;
FIG. 4 is a FayFan diagram of an embodiment of the present invention in a short focal optical path;
FIG. 5 is a FayFan plot under the secondary focal optical path of an embodiment of the present invention;
FIG. 6 is a FayFan diagram of a tele path according to an embodiment of the present invention;
FIG. 7 is a spot diagram under a short focal optical path according to an embodiment of the present invention;
FIG. 8 is a spot diagram of an embodiment of the present invention in the secondary focal optical path;
FIG. 9 is a spot diagram under a tele light path according to an embodiment of the present invention;
FIG. 10 is a graph of MTF modulation transfer function at a short focal optical path according to an embodiment of the present invention;
FIG. 11 is a graph of MTF modulation transfer function at the secondary focal length optical path in accordance with an embodiment of the present invention;
fig. 12 is a graph of MTF modulation transfer function in the long focal optical path according to an embodiment of the present invention.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
Example 1: referring to fig. 1 to 12, in this embodiment, there is provided an ultra-large target wide object distance compact type continuous zoom lens, which includes a front group lens, a stop C, a rear group lens, and a flat glass IMA sequentially arranged in a light incident direction, the front group lens including a front fixed group a and a magnification-varying group B, the rear group lens including a compensation group D and a rear fixed group E, the front fixed group including a meniscus negative lens A1, a meniscus positive lens A2, and a meniscus positive lens A3 sequentially arranged from left to right, the magnification-varying group B including a meniscus negative lens B1, a biconcave negative lens B2, and a meniscus positive lens B3 sequentially arranged from left to right; the compensation group D comprises a biconvex positive lens D1, a meniscus positive lens D2, a meniscus negative lens D3, a biconvex positive lens D4 and a meniscus positive lens D5 which are sequentially arranged from left to right; the rear fixed group E includes a meniscus negative lens E1, a meniscus positive lens E2, a meniscus negative lens E3, and a biconvex positive lens E4, which are sequentially arranged from left to right.
With the diaphragm C as a boundary, the focal power of the front group of lenses is negative, and the focal power of the rear group of lenses is positive.
In this embodiment, the front fixed group a, the variable magnification group B, the compensation group D, and the rear fixed group E all adopt a tightly-adhered cemented lens to perform the correction of the polychromatic optical aberration; in the front fixing group A, a first closely-connected cemented lens is formed by a meniscus negative lens A1 and a meniscus positive lens A2; in the zoom group B, a biconcave negative lens B2 and a meniscus positive lens B3 form a second closely-adhered cemented lens; in the compensation group D, a meniscus negative lens D3 and a biconvex positive lens D4 constitute a third close-contact cemented lens; in the rear fixed group E, a positive meniscus lens E2 and a negative meniscus lens E3 constitute a fourth adhesion cemented lens.
In this embodiment, the air distance from the first adhesion cemented lens to the meniscus positive lens A3 is 0.1mm; the air distance from the positive meniscus lens A3 to the negative meniscus lens B1 is variable, and the range is 1.88 mm-16.86 mm; the air distance from the meniscus negative lens B1 to the second close-contact bonding lens is 6.56mm, the distance from the second close-contact bonding lens to the diaphragm C is variable, the range is 4.09 mm-20.63 mm, the air distance from the diaphragm C to the biconvex positive lens D1 is 1mm, the air distance from the biconvex positive lens D1 to the meniscus positive lens D2 is 0.1mm, the air distance from the meniscus positive lens D2 to the third close-contact bonding lens is 5.08mm, and the air distance from the third close-contact bonding lens to the meniscus positive lens D5 is 0.1mm; the air distance from the positive meniscus lens D5 to the negative meniscus lens E1 is variable: the range is 1.44-5.32 mm; the air distance from the meniscus negative lens E1 to the fourth closely-adhered cemented lens is 4.33mm; the air distance from the fourth closely-adhered cemented lens to the biconvex positive lens E4 is 0.12mm; the air distance from the biconvex positive lens E4 to the plate glass is 18mm; the air distance from the plate glass to the image plane was 0.1mm.
In this embodiment, the focal power of the front fixed group a in the front group lens is positive and the focal power of the variable group B in the front group lens is negative; the optical power of the compensation group D in the rear group lens is positive, and the optical power of the rear fixing group E in the rear group lens is negative. Wherein the focal length F of the zoom group B B And wide-angle end focal length F W The ratio of (2) satisfies the relation: -0.85 < F B /F W ＜-0.75。
In the present embodiment, the bonding surface of the first closely bonded bonding lens in the front fixed group a is bent to the stop C side; the bonding surface of the second closely-adhered bonding lens in the zoom group B is bent to one side of the diaphragm C; the bonding surface of the third closely-adhered bonding lens in the compensation group D faces away from the side of the diaphragm C, and the focal length F of the third closely-adhered bonding lens 3 And a wide-angle end focal length F W The ratio of (2) satisfies the relation: -3.4 < F 3 /F W -2.8; the bonding surface of the fourth closely-adhered bonding lens in the rear fixing group E is bent to one side of the diaphragm, and the focal length F of the fourth closely-adhered bonding lens 4 And a wide-angle end focal length F W The ratio of (2) satisfies the relation: -2.5 < F 4 /F W ＜-2.1。
In the embodiment, the left R value of the negative meniscus lens A1 in the front fixing group A satisfies 67.5 < R < 69.3, the right R value of the negative meniscus lens A1 satisfies 40.1 < R < 41.8, and the lens thickness is 2.20mm; the left R value of the positive meniscus lens A2 is more than 40.1 and less than 41.8, the right R value of the positive meniscus lens A2 is more than 230.5 and less than 235.5, and the thickness of the lens is 7.96mm; the left R value of the positive meniscus lens A3 is 46.5 < R < 47.8, the right R value of the positive meniscus lens A3 is 154.2 < R < 156.8, and the thickness of the lens is 4.79mm.
In the embodiment, the left R value of the negative meniscus lens B1 in the variable magnification group B satisfies 732.5 < R < 738.9, the right R value of the negative meniscus lens B1 satisfies 13.3 < R < 14.6, and the lens thickness is 1.00mm; the left R value of the biconcave negative lens B2 is more than-39.8 and less than-38.5, the right R value of the biconcave negative lens B2 is more than 19.5 and less than 20.4, and the thickness of the lens is 1.00mm; the left R value of the positive meniscus lens B3 is more than 19.5 and less than 20.4, the right R value of the positive meniscus lens B3 is more than 84.1 and less than 85.6, and the thickness of the lens is 3.17mm.
In the embodiment, the R value at the left side of the biconvex positive lens D1 in the compensation group D is more than 49.8 and less than 52.8, the R value at the right side of the biconvex positive lens D1 is more than-117.1 and less than-109.7, and the thickness of the lens is 1.36mm; the left R value of the positive meniscus lens D2 is more than 11.9 and less than 13.7, the right R value of the positive meniscus lens D2 is more than 19.4 and less than 22.6, and the thickness of the lens is 1.48mm; the left R value of the negative meniscus lens D3 is more than 41.5 and less than 44.2, the right R value of the negative meniscus lens D3 is more than 9.2 and less than 10.8, and the thickness of the lens is 1.00mm; the R value of the left surface of the biconvex positive lens D4 is more than 9.2 and less than 10.8, the R value of the right surface of the biconvex positive lens D4 is more than-60.9 and less than-57.6, and the thickness of the lens is 3.11mm; the left R value of the positive meniscus lens D5 is 16.5 < R < 18.1, the right R value of the positive meniscus lens D5 is 96.1 < R < 108.4, and the thickness of the lens is 2.06mm.
In the embodiment, the left R value of the negative meniscus lens E1 in the rear fixed group E satisfies 61.5 < R < 66.8, the right R value of the negative meniscus lens E1 satisfies 14.8 < R < 16.1, and the lens thickness is 1.00mm; the left R value of the positive meniscus lens E2 is more than-11.7 and less than-10.2, the right R value of the positive meniscus lens E2 is more than-8.7 and less than-7.8, and the thickness of the lens is 3.68mm; the left R value of the negative meniscus lens E3 is more than-8.7 and less than-7.8, the right R value of the negative meniscus lens E3 is more than-15.2 and less than-14.2, and the thickness of the lens is 1.00mm; the left R value of the biconvex positive lens E4 is more than 109.5 and less than 115.8, the right R value of the biconvex positive lens E4 is more than-28.6 and less than-26.8, and the thickness of the lens is 5.06mm.
In this embodiment, the first closely-adhered cemented lens formed by the negative meniscus lens A1 and the positive meniscus lens A2 in the front fixed group a adopts a combination of heavy flint glass and lanthanum crown glass with larger difference in dispersion coefficient, so that chromatic aberration is effectively reduced; the second closely-adhered cemented lens formed by the biconcave negative lens B2 and the meniscus positive lens B3 in the zoom group B adopts a combination of dense phosphorus crown glass and dense flint glass with large refractive index difference and large dispersion coefficient difference; a third closely-adhered cemented lens consisting of a meniscus negative lens D3 and a biconvex positive lens D4 in the compensation group D adopts a combination of dense phosphorus crown glass and dense flint glass with large difference of refractive index and dispersion coefficient; and a fourth closely-adhered cemented lens formed by a positive meniscus lens E2 and a negative meniscus lens E3 in the rear fixed group E adopts a combination of crown flint glass and lanthanum crown glass with relatively close dispersion coefficients to balance the off-axis aberration of the ultra-large target surface light.
In this embodiment, the first bonding glue tab formed by the negative meniscus lens A1 and the positive meniscus lens A2 in the front fixed group a is supported by the positive meniscus lens A3 through a spacer ring; the meniscus negative lens B1 in the zoom group B and the second closely-adhered bonding sheet formed by the biconcave negative lens B2 and the meniscus positive lens B3 are directly supported by the edge of the lens; the biconvex positive lens D1 and the meniscus positive lens D2 in the compensation group D are supported by a spacing ring, the meniscus positive lens D2 and a third close-contact bonding sheet formed by the meniscus negative lens D3 and the biconvex positive lens D4 are supported by a spacing ring, and the third close-contact bonding sheet formed by the meniscus negative lens D3 and the biconvex positive lens D4 and the meniscus positive lens D5 are supported by a spacing ring; the back fixing group is characterized in that the meniscus negative lens E1 and the fourth closely-adhered bonding sheet formed by the meniscus positive lens E2 and the meniscus negative lens E3 are directly supported by the edge of the lens, and the fourth closely-adhered bonding sheet formed by the meniscus positive lens E2 and the meniscus negative lens E3 and the biconvex positive lens E4 are supported by a spacing ring.
In this embodiment, at the time of imaging: the light rays sequentially pass through a meniscus negative lens A1, a meniscus positive lens A2, a meniscus positive lens A3, a meniscus negative lens B1, a biconcave negative lens B2, a meniscus positive lens B3, a biconvex positive lens D1, a meniscus positive lens D2, a meniscus negative lens D3, a biconvex positive lens D4, a meniscus positive lens D5, a meniscus negative lens E1, a meniscus positive lens E2, a meniscus negative lens E3 and a biconvex positive lens E4 from left to right, and then are imaged.
In the present embodiment, in the front group lens, the front fixed group a composed of the meniscus negative lens A1, the meniscus positive lens A2, and the meniscus positive lens A3 is kept in a stationary state with respect to the image plane during zooming and focusing; the zoom group B formed by the meniscus negative lens B1, the biconcave negative lens B2 and the meniscus positive lens B3 moves left and right relative to the image plane in the zooming process so as to achieve the purpose of continuous zooming; in the rear group lens, a compensation group D formed by a biconvex positive lens D1, a meniscus positive lens D2, a meniscus negative lens D3, a biconvex positive lens D4 and a meniscus positive lens D5 moves left and right relative to an image surface in a focusing process to focus so as to compensate rear focus and aberration changes introduced in a zooming process; the rear fixed group E composed of the meniscus negative lens E1, the meniscus positive lens E2, the meniscus negative lens E3, and the biconvex positive lens E4 remains stationary with respect to the image plane during magnification and focusing.
In this embodiment, in the zoom group B composed of the meniscus negative lens B1, the biconcave negative lens B2, and the meniscus positive lens B3, during the continuous zooming, the compensation group D composed of the biconvex positive lens D1, the meniscus positive lens D2, the meniscus negative lens D3, the biconvex positive lens D4, and the meniscus positive lens D5 can perform focus compensation for different object distances under the same focal length while performing focus compensation for the entire zooming process.
Example 2: in the embodiment, the visual field angle of the compact continuous zoom lens with the ultra-large target surface and wide object distance formed by the optical lens group is 27-72 degrees, the focal length range is 21-50 mm, the total image height is more than or equal to 28.8mm, the total optical length is less than 100mm, and the compact continuous zoom lens can be used with a 4K-level large target surface high-resolution camera under the object distance of 0.5-infinity.
In this embodiment, the compact type continuous zoom lens with ultra-large target surface and wide object distance adopts a four-component optical zoom structure, which comprises a front fixed group A and a zoom group B, a compensation group D and a rear fixed group E, and can realize compact structure while performing ultra-large target surface imaging, wherein the focal length F of the zoom group B B And focal length F of compensation group D D The following are presentRelationship: -1.2 < F B /F D ＜-0.8。
In this embodiment, the specific parameters of each lens in the optical system are shown in table 1 below, the unit of radius and thickness shown in table 1 below is mm, and the surface numbers are sequentially arranged along the order from left to right shown in fig. 1:
TABLE 1
The lens light path schematic diagrams and the lens parameter diagrams of the ultra-large target wide-object-distance compact type continuous zoom lens shown in fig. 1, 2 and 3 and table 1 under short focus, secondary long focus and long focus realize compact lens volume, optimize and improve spherical shape, ensure good processability of each lens, and ensure stability and good assemblability of each component in the process of adjusting focal length and visual field through the structure form of left and right movement of the two and three groups of lens groups.
The optical Ray Fan diagram of the ultra-large target wide object distance compact type continuous zoom lens shown in fig. 4, 5 and 6 under the short focal length, the secondary long focal length and the long focal length can be known that the aberration among the lens groups of the lens is well corrected and balanced, and the aberration presents good transitional property along with the increase of the field of view.
The optical point column diagrams of the ultra-large target wide-object-distance compact type continuous zoom lens shown in fig. 7, 8 and 9 under the short focus, the secondary long focus and the long focus show that the point of the light rays of each aperture zone and each view field focused on the image surface through the lens is smaller, and the excellent resolving power of the lens in different view fields is shown.
Fig. 10 to 12 are MTF modulation transfer function diagrams of the lens at short focus, sub-long focus and long focus, the lens has resolution of 80lp/mm > 0.2 in full field under short focus, 80lp/mm > 0.4 in full field under sub-long focus, and 80lp/mm > 0.3 in full field under long focus, which means that the lens can maintain excellent imaging quality in the whole continuous zooming process.
In summary, the ultra-large target wide object distance compact type continuous zoom lens provided by the invention improves inherent off-axis aberration of the large target wide compact type lens through optimizing balance of aberration among components, realizes clear imaging under different object distances with the same focal length in a focusing group secondary compensation mode, corrects a secondary spectrum through reasonable material collocation, compensates and corrects aberration under different temperatures, realizes optical athermalization, and enables the ultra-large target wide object distance compact type continuous zoom lens to be realized.
Any of the above-described embodiments of the present invention disclosed herein, unless otherwise stated, if they disclose a numerical range, then the disclosed numerical range is the preferred numerical range, as will be appreciated by those of skill in the art: the preferred numerical ranges are merely those of the many possible numerical values where technical effects are more pronounced or representative. Since the numerical values are more and cannot be exhausted, only a part of the numerical values are disclosed to illustrate the technical scheme of the invention, and the numerical values listed above should not limit the protection scope of the invention.
Meanwhile, if the above invention discloses or relates to parts or structural members fixedly connected with each other, the fixed connection may be understood as follows unless otherwise stated: detachably fixed connection (e.g. using bolts or screws) can also be understood as: the non-detachable fixed connection (e.g. riveting, welding), of course, the mutual fixed connection may also be replaced by an integral structure (e.g. integrally formed using a casting process) (except for obviously being unable to use an integral forming process).
If the terms "first," "second," etc. are used herein to define a part, those skilled in the art will recognize that: the use of "first" and "second" is used merely to facilitate distinguishing between components and not otherwise stated, and does not have a special meaning.
In addition, terms used in any of the above-described aspects of the present disclosure to express positional relationship or shape have meanings including a state or shape similar to, similar to or approaching thereto unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components, or can be manufactured by an integral forming process.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical scheme of the present invention and are not limiting; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (8)
1. The ultra-large target surface wide-object-distance compact continuous zoom lens is characterized by comprising a front group of lenses, a diaphragm C, a rear group of lenses and plate glass, wherein the front group of lenses consists of a front fixed group A and a variable magnification group B, the rear group of lenses consists of a compensation group D and a rear fixed group E, the front fixed group A consists of a meniscus negative lens A1, a meniscus positive lens A2 and a meniscus positive lens A3, the meniscus negative lens A1, the biconcave negative lens B2 and the meniscus positive lens B3 are sequentially arranged from left to right; the compensation group D consists of a biconvex positive lens D1, a meniscus positive lens D2, a meniscus negative lens D3, a biconvex positive lens D4 and a meniscus positive lens D5 which are sequentially arranged from left to right; the rear fixed group E consists of a meniscus negative lens E1, a meniscus positive lens E2, a meniscus negative lens E3 and a biconvex positive lens E4 which are sequentially arranged from left to right;
the focal power of the front fixed group A in the front group of lenses is positive, and the focal power of the variable-power group B in the front group of lenses is negative; the focal power of the compensation group D in the rear group of lenses is positive, and the focal power of the rear fixing group E in the rear group of lenses is negative;
focal length F of the zoom group B B And wide-angle end focal length F W The ratio of (2) satisfies the relation: -0.85 < F B /F W ＜-0.75。
2. The ultra-large target wide object distance compact type continuous zoom lens according to claim 1, wherein the front fixed group a, the variable magnification group B, the compensation group D and the rear fixed group E are all formed by closely adhering a cemented lens for correcting the chromatic aberration; in the front fixed group A, a first closely-adhered cemented lens is formed by a meniscus negative lens A1 and a meniscus positive lens A2; in the zoom group B, a biconcave negative lens B2 and a meniscus positive lens B3 form a second closely-adhered cemented lens; in the compensation group D, a meniscus negative lens D3 and a biconvex positive lens D4 constitute a third close-contact cemented lens; in the rear fixed group E, a positive meniscus lens E2 and a negative meniscus lens E3 constitute a fourth adhesion cemented lens.
3. The ultra-large target wide object distance compact type continuous zoom lens according to claim 2, wherein the air distance from the first closely-adhered cemented lens to the meniscus positive lens A3 is 0.1mm; the air distance from the positive meniscus lens A3 to the negative meniscus lens B1 is variable, and the range is 1.88 mm-16.86 mm; the air distance from the meniscus negative lens B1 to the second close-contact bonding lens is 6.56mm, the distance from the second close-contact bonding lens to the diaphragm C is variable, the range is 4.09 mm-20.63 mm, the air distance from the diaphragm C to the biconvex positive lens D1 is 1mm, the air distance from the biconvex positive lens D1 to the meniscus positive lens D2 is 0.1mm, the air distance from the meniscus positive lens D2 to the third close-contact bonding lens is 5.08mm, and the air distance from the third close-contact bonding lens to the meniscus positive lens D5 is 0.1mm; the air distance from the positive meniscus lens D5 to the negative meniscus lens E1 is variable: the range is 1.44-5.32 mm; the air distance from the meniscus negative lens E1 to the fourth closely-adhered cemented lens is 4.33mm; the air distance from the fourth closely-adhered cemented lens to the biconvex positive lens E4 is 0.12mm; the air distance from the biconvex positive lens E4 to the plate glass is 18mm; the air distance from the plate glass to the image plane was 0.1mm.
4. The ultra-large target wide object distance compact type continuous zoom lens according to claim 2, wherein the bonding surface of the first closely bonded bonding lens in the front fixed group a is bent to the stop C side; the bonding surface of the second closely-adhered bonding lens in the zoom group B is bent to one side of the diaphragm C; third secret in the compensation group DThe bonding surface of the bonding lens is away from the side of the diaphragm C, and the focal length F of the third bonding lens 3 And a wide-angle end focal length F W The ratio of (2) satisfies the relation: -3.4 < F 3 /F W -2.8; the bonding surface of the fourth closely-adhered bonding lens in the rear fixing group E is bent to one side of the diaphragm, and the focal length F of the fourth closely-adhered bonding lens 4 And a wide-angle end focal length F W The ratio of (2) satisfies the relation: -2.5 < F 4 /F W ＜-2.1。
5. The ultra-large target wide object distance compact type continuous zoom lens according to claim 1, wherein the left R value of the negative meniscus lens A1 in the front fixed group a satisfies 67.5 < R < 69.3, the right R value of the negative meniscus lens A1 satisfies 40.1 < R < 41.8, and the lens thickness is 2.20mm; the left R value of the positive meniscus lens A2 is more than 40.1 and less than 41.8, the right R value of the positive meniscus lens A2 is more than 230.5 and less than 235.5, and the thickness of the lens is 7.96mm; the left R value of the positive meniscus lens A3 is more than 46.5 and less than 47.8, the right R value of the positive meniscus lens A3 is more than 154.2 and less than 156.8, and the thickness of the lens is 4.79mm; the R value of the left surface of the negative meniscus lens B1 in the zoom group B is 732.5 < R < 738.9, the R value of the right surface of the negative meniscus lens B1 is 13.3 < R < 14.6, and the thickness of the lens is 1.00mm; the left R value of the biconcave negative lens B2 is more than-39.8 and less than-38.5, the right R value of the biconcave negative lens B2 is more than 19.5 and less than 20.4, and the thickness of the lens is 1.00mm; the left R value of the positive meniscus lens B3 is more than 19.5 and less than 20.4, the right R value of the positive meniscus lens B3 is more than 84.1 and less than 85.6, and the thickness of the lens is 3.17mm; the R value at the left side of the biconvex positive lens D1 in the compensation group D is more than 49.8 and less than 52.8, the R value at the right side of the biconvex positive lens D1 is more than-117.1 and less than-109.7, and the thickness of the lens is 1.36mm; the left R value of the positive meniscus lens D2 is more than 11.9 and less than 13.7, the right R value of the positive meniscus lens D2 is more than 19.4 and less than 22.6, and the thickness of the lens is 1.48mm; the left R value of the negative meniscus lens D3 is more than 41.5 and less than 44.2, the right R value of the negative meniscus lens D3 is more than 9.2 and less than 10.8, and the thickness of the lens is 1.00mm; the R value of the left surface of the biconvex positive lens D4 is more than 9.2 and less than 10.8, the R value of the right surface of the biconvex positive lens D4 is more than-60.9 and less than-57.6, and the thickness of the lens is 3.11mm; the left R value of the positive meniscus lens D5 is 16.5 < R < 18.1, the right R value of the positive meniscus lens D5 is 96.1 < R < 108.4, and the thickness of the lens is 2.06mm; the left R value of the negative meniscus lens E1 in the rear fixed group E is more than 61.5 and less than 66.8, the right R value of the negative meniscus lens E1 is more than 14.8 and less than 16.1, and the thickness of the lens is 1.00mm; the left R value of the positive meniscus lens E2 is more than-11.7 and less than-10.2, the right R value of the positive meniscus lens E2 is more than-8.7 and less than-7.8, and the thickness of the lens is 3.68mm; the left R value of the negative meniscus lens E3 is more than-8.7 and less than-7.8, the right R value of the negative meniscus lens E3 is more than-15.2 and less than-14.2, and the thickness of the lens is 1.00mm; the left R value of the biconvex positive lens E4 is more than 109.5 and less than 115.8, the right R value of the biconvex positive lens E4 is more than-28.6 and less than-26.8, and the thickness of the lens is 5.06mm.
6. The ultra-large target wide object distance compact type continuous zoom lens according to claim 2, wherein the first closely-adhered cemented lens is a combination of heavy flint glass and lanthanum crown glass with larger difference of dispersion coefficients, so as to effectively reduce chromatic aberration; the second closely-adhered cemented lens adopts a combination of dense phosphorus crown glass and dense flint glass with large refractive index difference and large dispersion coefficient difference; the third closely-adhered cemented lens adopts a combination of dense phosphorus crown glass and dense flint glass with large difference of refractive index and dispersion coefficient; and the fourth closely-adhered cemented lens adopts a combination of crown flint glass and lanthanum crown glass with relatively close dispersion coefficients to balance the off-axis aberration of the ultra-large target surface light.
7. An imaging method using an ultra-large target wide object distance compact type continuous zoom lens according to any one of claims 1 to 6, wherein light rays are imaged after passing through a meniscus negative lens A1, a meniscus positive lens A2, a meniscus positive lens A3, a meniscus negative lens B1, a biconcave negative lens B2, a meniscus positive lens B3, a biconvex positive lens D1, a meniscus positive lens D2, a meniscus negative lens D3, a biconvex positive lens D4, a meniscus positive lens D5, a meniscus negative lens E1, a meniscus positive lens E2, a meniscus negative lens E3, and a biconvex positive lens E4 in this order from left to right.
8. The imaging method of claim 7, wherein in the front lens group, a front fixed group a composed of a negative meniscus lens A1, a positive meniscus lens A2 and a positive meniscus lens A3 is kept stationary relative to the image plane during zooming and focusing; the zoom group B formed by the meniscus negative lens B1, the biconcave negative lens B2 and the meniscus positive lens B3 moves left and right relative to the image plane in the zooming process so as to achieve the purpose of continuous zooming; in the rear group lens, a compensation group D formed by a biconvex positive lens D1, a meniscus positive lens D2, a meniscus negative lens D3, a biconvex positive lens D4 and a meniscus positive lens D5 moves left and right relative to an image surface in a focusing process to focus so as to compensate rear focus and aberration changes introduced in a zooming process; the rear fixed group E formed by the meniscus negative lens E1, the meniscus positive lens E2, the meniscus negative lens E3 and the biconvex positive lens E4 keeps a static state relative to an image surface in the zooming and focusing processes; in the continuous zooming process, the variable magnification group B formed by the meniscus negative lens B1, the biconcave negative lens B2 and the meniscus positive lens B3 can perform focusing compensation on different object distances under the same focal length while the compensation group D formed by the biconvex positive lens D1, the meniscus positive lens D2, the meniscus negative lens D3, the biconvex positive lens D4 and the meniscus positive lens D5 performs focusing compensation on the whole zooming process.
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| JP5200527B2 (en) * | 2007-12-26 | 2013-06-05 | ソニー株式会社 | Zoom lens and imaging device |
| WO2018076330A1 (en) * | 2016-10-31 | 2018-05-03 | 中国科学院长春光学精密机械与物理研究所 | Finite conjugate distance optical zoom system with adjustable object distance |
| CN107957622B (en) * | 2018-01-04 | 2023-12-12 | 东莞市宇瞳光学科技股份有限公司 | Large aperture and large image plane tele zoom lens |
| CN209198755U (en) * | 2018-11-06 | 2019-08-02 | 中国科学院西安光学精密机械研究所 | A kind of short-wave infrared continuous magnification lens |
| CN114063271B (en) * | 2021-10-29 | 2023-03-31 | 福建福光股份有限公司 | Zoom and distance-variable industrial image detection optical system |
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