CN108132527B - Optical system with optimized low-light effect - Google Patents
Optical system with optimized low-light effect Download PDFInfo
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- CN108132527B CN108132527B CN201810123282.2A CN201810123282A CN108132527B CN 108132527 B CN108132527 B CN 108132527B CN 201810123282 A CN201810123282 A CN 201810123282A CN 108132527 B CN108132527 B CN 108132527B
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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 +-+
Abstract
An optical system with optimized low-light effect, comprising in order from an object side to an image side: the lens comprises a first lens group with positive focal power, a second lens group with negative focal power, an aperture diaphragm, a third lens group with positive focal power, a fourth lens group with negative focal power, a fifth lens group with positive focal power and a double-spectrum photosensitive mechanism, wherein: the system has the characteristics of independent visible/infrared double-light imaging, image synthesis, sensor focusing, ultrahigh magnification, small volume, large aperture and the like under the condition of keeping the existing volume not increased, can well correct various aberrations spanning the whole zoom area, and can correspond to a solid camera element capable of carrying out ultrahigh definition 4K-level image shooting.
Description
Technical Field
The invention relates to a technology in the field of optical devices, in particular to an optical system with excellent low-light effect, super-large zoom ratio and 4K image quality.
Background
The market demands for low-light shooting increasingly strongly, and excellent low-light effect must require the lens to have as large an f-number as possible, and in order to improve the low-light shooting effect of the lens, there are two general solutions: first, the light ring of increase camera lens guarantees that when shooing in dark environment, more imaging light can be caught to the camera lens to this brings the promotion of picture illuminance. However, the size of the aperture depends on the effective aperture of the lens inside the lens, and a larger aperture inevitably causes the lens to become a 'natural object', which causes inconvenience to the lens processing and the lens assembly. And secondly, low-illumination shooting is realized by utilizing infrared rays, so that the lens is required to realize an infrared confocal function in a full-focus section in design. Because the external environment is complex, it is difficult to ensure that there is sufficient infrared light in the environment, and additional infrared light source generators and photosensitive components are usually required to be arranged on the lens, which brings cost pressure. Compared with visible light imaging, the infrared imaging method has larger performance loss in the infrared mode, and cannot achieve the same resolution level.
Disclosure of Invention
The invention provides an optical system with optimized low-light effect, which has the characteristics of independent visible/infrared double-light imaging, image synthesis, sensor focusing, ultrahigh magnification, small volume, large aperture and the like under the condition of keeping the existing volume not increased, can well correct various aberrations across the whole zoom range, and can be used for a solid-state imaging element capable of carrying out ultrahigh-definition 4K-level image shooting.
The invention is realized by the following technical scheme:
the present invention comprises, in order from an object side to an image side: the lens comprises a first lens group with positive focal power, a second lens group with negative focal power, an aperture diaphragm, a third lens group with positive focal power, a fourth lens group with negative focal power, a fifth lens group with positive focal power and a double-spectrum photosensitive mechanism, wherein: the first lens group and the fifth lens group are fixedly arranged, the second lens group for zooming, the aperture diaphragm, the third lens group and the fourth lens group for focusing are movably arranged, the second lens group moves from the object side to the image side along the optical axis, and meanwhile, the third lens group moves along the optical axis and realizes zooming from the wide-angle end to the telephoto end; the fourth lens group moves along the optical axis to correct virtual focus caused by the zooming process and the object distance change, and the double-spectrum photosensitive mechanism moves along the optical axis to realize focusing of the picture.
The double-spectrum photosensitive mechanism comprises: set up spectral prism on the optical axis and be located the infrared sensor and the visible light sensor of spectral prism output, wherein: the beam splitting prism separates visible light from infrared light, light with one wavelength is transmitted through the prism, light with the other wavelength is reflected and leaves the prism from other paths, images of the two sensors are fused through a complex algorithm, and the obtained picture effect can be compatible with the characteristics of high infrared light imaging picture brightness, rich visible light imaging color information and high resolving power.
The focusing, through set up sensor focusing mechanism on two spectrum photosensitive mechanism, focus to the imaging quality of the visible light and the infrared light in two directions respectively, wherein: the performance focusing of the visible light path is realized by adjusting the visible light sensor to move back and forth along the visible light axis direction in the visible light path; the performance focusing of the infrared light path is realized by adjusting the infrared sensor to move back and forth along the infrared optical axis direction in the infrared light path.
The first lens group comprises the ultra-low dispersion glass so as to greatly tighten the infrared light and the purple light at the telescopic end of the lens, so that the lens can obtain sharper color experience; particularly, the negative power lens and the positive power lens in the first lens group are glued, and peripheral chromatic aberration transition of the optical system is ensured as much as possible through matching of the refractive index and the Abbe number of the lens materials. In order to make up for the defect of insufficient focal power of the lens made of the ultrahigh dispersion material, a high-refractive-index material is particularly used, so that the tortuosity of imaging light is improved, and the light trend stability of a long-focus section is ensured.
The refractive index of the first lens of the second lens group meets Nd >1.85, the focal length of the lens is increased, and partial focal power is shared from a group of structures with traditional structures; the double concave surfaces are in an aspheric structure, and each concave surface sequentially corresponds to the curvature of field of the optimized optical system from the wide-angle end to the telephoto end, so that the image quality uniformity in the whole zooming process is improved; meanwhile, the second lens group comprises part of ultra-low dispersion glass, and still plays an important optimization role in chromatic aberration of the system. The second lens group is a main zoom group, and magnification is increased or reduced in a mode of being matched with the third lens group.
The aperture diaphragm adopts a plane structure, aims to improve the imaging quality of the central area of the full focus section, and makes the impression experience leap when the local close-up focusing on the center of the picture is carried out.
The third lens group and the aperture diaphragm move synchronously in the zooming process, so that the lens can still keep a larger aperture even under a larger focal length. The lenses in the third lens group comprise the ultra-low dispersion glass, so that the full-wave-band color light yield difference of the lens at the wide-angle end is improved similarly to the previous effect, and the lens is ensured to have excellent color restoration effect; the third lens group complements the focal power born by the group through a structure that a plurality of negative focal power lenses are glued with positive focal power lenses.
The refractive indexes of the lenses in the fourth lens group all meet Nd >1.80, so that the focusing stroke length of the lens is shortened. When the focal length or the object distance is changed, the position of the fourth lens group is adjusted along the optical axis direction, and the focusing of the lens under different magnification or reduction ratios can be realized.
The difference of the refractive indexes of the cemented lens in the fifth lens group is larger than 0.3, so that the incident light angle of the marginal field of view with each multiplying power is adjusted, and the light overflow caused by an overlarge amplification angle cannot be recorded by the sensor. The fifth lens group includes aspheric lenses to further improve the image quality level of the peripheral field of view.
Technical effects
Compared with the prior art, in the optical system, the beam splitter prism is used for carrying out infrared and visible light splitting on a light path, and the two sensing chips are matched to respectively image infrared rays and visible rays, wherein the visible light imaging has rich color information and higher resolving power, the infrared light imaging has higher image illumination and lower noise signals, the characteristics of capturing two images are fused through a complex algorithm, and the obtained image has the advantages of visibility and infrared at the same time: the method has rich color detail information, higher image illumination, higher image resolution level and lower noise signal. The imaging device has excellent performance in low-light environments such as night and dark room. The multi-blade iris diaphragm is adopted, so that the defect that the roundness of the cat eye diaphragm is not high when the caliber is reduced is overcome, and the image quality in the sagittal direction and the meridional direction in each state is balanced and uniform; the invention adopts a special focusing mode of sensor focusing. The infrared sensor and the visible light sensor are respectively focused through the front and back displacement of the sensor on the optical axis, so that visible and infrared light paths reach the clearest focusing state under each multiplying power, and the defect that the structure of a single focusing group cannot guarantee simultaneous clearness of the infrared/visible double light paths is overcome. Compared with a lens group focusing structure, the focusing stroke of the sensor is short and very short, and great help is brought to the shortening of the length of the lens. The invention realizes the change of focal length through the cooperative movement of two zooming groups: the lens adopts a structure of two-group and three-group linkage zooming and four-group focusing. The strokes of the three moving groups are overlapped to a certain degree, the groups are ensured not to be mutually interfered through the special focusing curve design, and meanwhile, the whole length of the lens is greatly reduced. The invention adopts a movable diaphragm structure, the lens of the diaphragm assembly moves together with the three groups in the zooming process and is matched with the telescopic circuit driving element, and the circuit diaphragm control element can stretch and match the length along with the movement of the groups; finally, a larger zoom magnification is realized in a smaller volume.
Drawings
FIG. 1 is a schematic structural view of example 1;
fig. 2 is respective aberration diagrams of the lens of example 1 at the wide-angle end with respect to the d-line;
FIG. 3 is a diagram showing aberrations of the telephoto end with respect to the d-line of the lens system of embodiment 1;
FIG. 4 is a schematic structural view of example 2;
fig. 5 is a diagram of various aberrations of the lens of example 2 at the wide-angle end with respect to the d-line;
FIG. 6 is a diagram showing aberrations of the telephoto end with respect to the d-line in the lens system of embodiment 2;
FIGS. 7 and 8 are schematic comparison diagrams of the prior art and the effect of the present invention, respectively;
FIGS. 9 and 10 are a schematic diagram and a schematic structural diagram of a dual-spectrum photosensitive mechanism, respectively;
in the figure: the lens comprises first to fifth lens groups G1 to G5, first to nineteenth lenses L1 to L19, a P beam splitter prism, an S aperture diaphragm, a VIS-IMG visible light sensor, an IR-IMG infrared light sensor, CG protective glass, an ICF filter, a sensor focusing mechanism 1, a guide shaft 2, a moving frame 3, a circular shaft hole 301, a U-shaped hole 302, a driving mechanism 4 and a support 5.
Detailed Description
Example 1
As shown in fig. 1, the present embodiment includes, in order from the object side to the image side, a first lens group G1 having positive power, a second lens group G2 having negative power, an aperture stop S of the system, a third lens group G3 having positive power, a fourth lens group G4 having negative power, a fifth lens group G5 having positive power, and a dual-spectrum photosensitive mechanism including a beam splitter prism P, an infrared sensor IR-IMG, and a visible light sensor VIS-IMG.
The ratio of the focal length of the lens telephoto end of the first lens group G1 to the focal length of the lens group is (1.40,4.25), and the ratio of the focal length of the first lens on the near object side of the first lens group G1 to the focal length of the lens telephoto end is (-0.48, -0.23).
The ratio of the focal length of the first lens on the near object side in the second lens group G2 to the focal length of the lens group is (1.05,2.15), the ratio of the focal length at the wide-angle end of the lens to the distance between the first lens group G1 and the second lens group G2 at the wide-angle end of the lens is (6.56,9.20), and the ratio of the difference between the focal length at the telephoto end of the lens and the focal length at the wide-angle end of the lens to the movement length of the lens group from the wide-angle end to the telephoto end of the lens is (3.05, 3.95).
The ratio of the focal length of the first lens on the near object side in the third lens group G3 to the focal length of the lens group at the wide-angle end is (4.39,6.95), the ratio of the focal length of the lens group at the wide-angle end to the focal length of the lens group is (0.03,0.21), and the ratio of the focal length of the telephoto end to the distance between the first lens group G1 and the third lens group G3 at the wide-angle end is (1.40, 2.95).
The ratio of the difference between the focal length of the fourth lens group G4 at the telephoto end and the wide-angle end to the focal length of the lens group is (-11.58, -7.39), and the ratio of the focal length of the lens group to the focal length of the third lens group is (-0.72, -0.21).
The ratio of the focal length of the fifth lens group G5 at the wide-angle end to the focal length of the lens group is (1.07,1.30), and the ratio of the focal length of the first lens at the near-middle side to the focal length of the lens group is (-0.794, + 0.833).
Specifically, in the present embodiment:
the first lens group G1 includes, in order from the object side: the lens comprises a first lens L1 with positive focal power, a second lens L2 with negative focal power, a third lens L3 with positive focal power, a fourth lens L4 with positive focal power and a fifth lens L5 with positive focal power, wherein the first lens L1 and the second lens L2 are glued.
The second lens group G2 includes, in order from the object side: a sixth lens L6 having negative power and both surfaces being aspherical, a seventh lens L7 having negative power, an eighth lens L8 having positive power, and a ninth lens L9 having negative power and both surfaces being aspherical.
The third lens group G3 includes, in order from the object side: a tenth lens L10 having a positive power and a back surface being aspheric, an eleventh lens L11 having a negative power, a twelfth lens L12 having a positive power, a thirteenth lens L13 having a negative power, and a fourteenth lens L14 having a positive power and a back surface being aspheric, wherein the eleventh lens L11 is cemented with the twelfth lens L12, the thirteenth lens L13 is cemented with the fourteenth lens L14.
The fourth lens group G4 includes, in order from the object side: a fifteenth lens L15 having a negative optical power and a sixteenth lens L16 having a positive optical power, wherein the fifteenth lens L15 is cemented with the sixteenth lens L16.
The fifth lens group G5 includes, in order from the object side: a seventeenth lens L17 with positive focal power, an eighteenth lens L18 with negative focal power and a nineteenth lens L19 with positive focal power and both aspheric surfaces, wherein the seventeenth lens L17 is cemented with the eighteenth lens L18.
As shown in fig. 9, the incident surface of the beam splitter prism P is plated with an antireflection film or an equivalent antireflection structure for visible light and infrared light, the beam splitting surface of the beam splitter prism is provided with optical filters ICF for splitting light with different wavelengths or is plated with a film system for splitting light with different wavelengths, the visible light exit surface is provided with a visible antireflection infrared cut-off filter or is plated with a visible antireflection infrared cut-off film, and the infrared exit surface of the beam splitter prism is provided with an infrared antireflection visible filter or is plated with an infrared antireflection visible cut-off film.
The beam splitting prism separates visible light from infrared light, light with one wavelength is transmitted through the prism, light with the other wavelength is reflected and leaves the prism from other paths, images of the two sensors are fused through a complex algorithm, and the obtained picture effect can be compatible with the characteristics of high infrared light imaging picture brightness, rich visible light imaging color information and high resolving power.
As shown in fig. 9, the dual-spectrum photosensitive mechanism is provided with a sensor focusing mechanism 1, so that each sensor can move along the optical axis of the optical path to realize focusing.
As shown in fig. 10, the specific structure of the sensor focus adjustment mechanism 1 includes: a guide shaft 2, a movable frame 3 with a light-passing hole (not shown in the figure) arranged on the guide shaft 2 in a sliding way, and a driving mechanism 4 connected with the movable frame 3, wherein: the light through hole is arranged right opposite to the movable sensor IMG, so that light rays of a light path can be collected through the light through hole.
The optimal number of the guide shafts 2 is two, and a circular shaft hole 301 and a U-shaped hole 302 which are used for sliding are respectively arranged on two sides of the corresponding movable frame 3.
The driving mechanism 4 comprises: driving motor and set up in support 5 of its output, wherein: the support 5 is connected with the movable frame 3, the driving force of the driving motor enables the sensor focusing mechanism to move back and forth stably along the optical axis direction of the light path, the movement of the sensor in the optical axis direction is realized, the higher the movement precision is, and the more accurate the performance and the focus control is.
In a state that the first lens group and the fifth lens group are fixed, the second lens group moves from the object side to the image side along the optical axis, the third lens group moves along the optical axis, the positions of the lens groups on the optical axis correspond to the positions of the second lens group one by one, so that the zooming from the wide-angle end to the telephoto end is realized, and the fourth lens group moves along the optical axis, so that the virtual focus caused by the zooming process and the object distance change is corrected. After passing through the light splitting prism, the light is divided into two paths of infrared light and visible light, and the two paths of infrared light and the visible light enter the corresponding infrared sensor IR-IMG and visible light sensor VIS-IMG respectively. The infrared sensor and the visible light sensor move along the optical axis, so that the pictures of the infrared light path and the visible light path are kept focused clearly at the same time.
And protective glass and a visible cut-off filter are preferably arranged between the beam splitter prism and the infrared sensor.
And protective glass and an infrared cut-off filter are preferably arranged between the light splitting prism and the visible light sensor.
The filter is used for filtering out light rays and stray light of unnecessary wave bands.
The output ends of the infrared sensor and the visible light sensor are further provided with solid-state image pickup elements such as CCD, CMOS and the like.
Hereinafter, various numerical data about the zoom lens of embodiment 1 are shown.
EFL 6.4 wide angle end to 220 telephoto end
F number 1.41 wide angle end-4.35 telephoto end
Table 1 shows the structural parameters of the lens of example 1; table 2 shows zoom parameters of the lens of example 1; table 3 shows the lens aspherical coefficients of example 1.
Fig. 1 is each aberration diagram of a lens of embodiment 1 at the wide-angle end with respect to the d-line; fig. 2 is each aberration diagram of the telephoto end with respect to the d-line of the lens of embodiment 1.
Table 1 example 1 lens construction parameters
Table 2 example 1 lens zoom parameters
| Surface number | W | T |
| A | 0.88 | 59.77 |
| B | 64.31 | 1.69 |
| C | 1.15 | 2.17 |
| D | 10.24 | 12.93 |
| VIS E | 0.52 | 0.51 |
| IR E | 0.64 | 2.16 |
Table 3 aspherical coefficients of lens in example 1
| Surface number | K | A4 | A6 | A8 | A10 |
| S10 | 2.31 | 5.21E-05 | 6.75E-07 | 4.86E-09 | -6.87E-11 |
| S11 | 0.00 | -3.23E-05 | -4.59E-07 | -2.97E-09 | 9.10E-11 |
| S16 | -0.44 | -2.87E-05 | 7.65E-07 | -2.49E-09 | -4.31E-11 |
| S17 | 0.00 | -3.22E-06 | 5.61E-07 | 3.92E-09 | 5.63E-12 |
| S20 | 24.00 | 1.04E-05 | 3.26E-08 | -1.93E-10 | 2.59E-13 |
| S26 | -7.68 | 1.61E-05 | -5.61E-08 | 5.81E-10 | -4.21E-12 |
| S33 | -2.11 | -5.04E-05 | 8.39E-07 | -5.61E-08 | 1.09E-09 |
| S34 | 0.21 | 2.72E-05 | 1.89E-06 | -9.85E-08 | 2.04E-09 |
Example 2
The difference from embodiment 1 is that, in this embodiment:
the second lens group G2 includes, in order from the object side: a sixth lens L6 having a negative power, a seventh lens L7 having a negative power and both surfaces being aspherical, an eighth lens L8 having a positive power, and a ninth lens L9 having a negative power and both surfaces being aspherical.
The third lens group G3 includes, in order from the object side: a tenth lens L10 having positive optical power and both surfaces being aspheric, an eleventh lens L11 having negative optical power, a twelfth lens L12 having positive optical power, a thirteenth lens L13 having negative optical power, and a fourteenth lens L14 having positive optical power, wherein the eleventh lens L11 is cemented with the twelfth lens L12, and the thirteenth lens L13 is cemented with the fourteenth lens L14.
Hereinafter, various numerical data about the zoom lens of embodiment 2 are shown.
EFL 6.50 wide angle end 215 telephoto end
F number 1.48 wide angle end-4.93 telephoto end
Table 4 shows the structural parameters of the lens of example 2; table 5 shows zoom parameters of the lens of example 2; table 6 shows the lens aspherical coefficients of example 2.
Fig. 3 is each aberration diagram of the lens of embodiment 2 at the wide-angle end with respect to the d-line; fig. 4 is each aberration diagram of the telephoto end with respect to the d-line of the lens of embodiment 2.
Table 4 example 2 lens construction parameters
Table 5 example 2 lens zoom parameters
| Surface number | W | T |
| A | 0.65 | 53.02 |
| B | 66.21 | 2.00 |
| C | 1.10 | 10.41 |
| D | 10.78 | 13.30 |
| VIS E | 0.41 | -0.39 |
| IR E | 0.57 | 0.95 |
Table 6 example 2 lens aspherical surface coefficients
| Surface number | K | A4 | A6 | A8 | A10 |
| S12 | 0.06 | 3.39E-05 | -8.11E-07 | 1.06E-08 | -6.17E-11 |
| S13 | -1.11 | 1.42E-05 | -7.24E-07 | 9.58E-10 | -5.09E-11 |
| S19 | -0.01 | -7.80E-06 | 1.18E-08 | -4.24E-11 | 5.15E-14 |
| S20 | 3.59 | 1.61E-05 | 1.13E-08 | 6.32E-11 | 7.13E-14 |
| S33 | 1.26 | 2.99E-05 | -1.15E-07 | -1.41E-08 | 6.27E-10 |
| S34 | -0.70 | 3.25E-05 | -1.99E-07 | -2.78E-08 | 9.31E-10 |
As can be seen from comparison between fig. 7 and fig. 8, the present invention achieves a large increase in low-light effect and resolution level through infrared and visible light splitting paths, a sensor focusing strategy, and dual-image fusion.
The foregoing embodiments may be modified in many different ways by those skilled in the art without departing from the spirit and scope of the invention, which is defined by the appended claims and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (11)
1. An optical system comprising, in order from an object side to an image side: the lens comprises a first lens group with positive focal power, a second lens group with negative focal power, an aperture diaphragm, a third lens group with positive focal power, a fourth lens group with negative focal power, a fifth lens group with positive focal power and a double-spectrum photosensitive mechanism, wherein: the first lens group and the fifth lens group are fixedly arranged, the second lens group, the aperture diaphragm and the third lens group for zooming and the fourth lens group for focusing are movably arranged, the third lens group and the aperture diaphragm synchronously move in the zooming process, the second lens group moves from the object side to the image side along the optical axis, and meanwhile, the third lens group moves along the optical axis and realizes zooming from the wide-angle end to the telephoto end; the fourth lens group moves along the optical axis to correct virtual focus caused by a zooming process and object distance change, and the double-spectrum photosensitive mechanism moves along the optical axis to realize focusing of a picture;
the first lens group comprises from the object side: the optical system comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power and a fifth lens with positive focal power, wherein the second lens and the third lens are glued, the refractive index of the second lens is 1.85, the Abbe number is 32.3, the refractive index of the third lens is 1.70, and the Abbe number is 55.5, and peripheral chromatic aberration transition of the optical system is ensured through matching of the refractive index of a lens material and the Abbe number;
the fourth lens group sequentially comprises from the object side: a fifteenth lens having a negative optical power and a sixteenth lens having a positive optical power, wherein the fifteenth lens is cemented with the sixteenth lens;
the fifth lens group sequentially includes from the object side: a seventeenth lens with positive focal power, an eighteenth lens with negative focal power and a nineteenth lens with positive focal power and aspheric surfaces on both surfaces, wherein the seventeenth lens and the eighteenth lens are glued;
the refractive index of the first lens of the second lens group meets Nd > 1.85;
the refractive indexes of the lenses in the fourth lens group all meet Nd > 1.80;
the difference of the refractive indexes of the cemented lens in the fifth lens group is more than 0.3.
2. The system of claim 1, wherein the first lens group comprises ultra-low dispersion glass and a cemented lens consisting of a negative power lens and a positive power lens; the second lens group comprises ultra-low dispersion glass; the aperture diaphragm adopts a plane structure; the lenses in the third lens group comprise ultra-low dispersion glass and a plurality of cemented lenses consisting of negative focal power lenses and positive focal power lenses; the fifth lens group uses aspherical lenses.
3. The system according to claim 1 or 2, wherein the ratio of the focal length of the lens group at the telephoto end to the focal length of the lens group in the first lens group is (1.40,4.25), and the ratio of the focal length of the first lens at the near-object side to the focal length at the telephoto end is (-0.48, -0.23).
4. The system according to claim 1 or 2, wherein the ratio of the focal length of the first lens on the near object side of the second lens group to the focal length of the lens group is (1.05,2.15), the ratio of the focal length at the wide-angle end to the distance between the first lens group and the second lens group at the wide-angle end is (6.56,9.20), and the ratio of the difference between the focal length at the telephoto end and the focal length at the wide-angle end to the movement length of the lens group from the wide-angle end to the telephoto end is (3.05, 3.95).
5. The system according to claim 1 or 2, wherein the ratio of the focal length of the first lens on the near-object side of the third lens group to the focal length of the wide-angle end of the lens is (4.39,6.95), the ratio of the focal length of the wide-angle end of the lens to the focal length of the lens group is (0.03,0.21), and the ratio of the focal length of the telephoto end of the lens to the distance between the first lens group and the third lens group at the wide-angle end of the lens is (1.40, 2.95).
6. The system according to claim 1 or 2, wherein the ratio of the difference between the focal length at the telephoto end and the focal length at the wide-angle end of the fourth lens group to the focal length of the lens group is (-11.58, -7.39), and the ratio of the focal length of the lens group to the focal length of the third lens group is (-0.72, -0.21).
7. The system according to claim 1 or 2, wherein the ratio of the focal length at the wide-angle end of the fifth lens group to the focal length of the lens group is (1.07,1.30), and wherein the ratio of the focal length of the first lens at the near-object side to the focal length of the lens group is (-0.794, + 0.833).
8. The system of claim 1, wherein said dual-spectrum sensing mechanism comprises: set up spectral prism on the optical axis and be located the infrared sensor and the visible light sensor of spectral prism output, wherein: the beam splitting prism separates visible light from infrared light, light with one wavelength transmits through the prism, light with the other wavelength reflects and leaves the prism from other paths, and images of the two sensors are fused through a complex algorithm.
9. The system of claim 8, wherein the incidence surface of the beam splitter prism is coated with antireflection coatings for visible light and infrared light, the beam splitter surface of the beam splitter prism is provided with light filters for splitting light with different wavelengths or coated with a film system for splitting light with different wavelengths, the visible light emergence surface is provided with a visible antireflection infrared cut-off filter or coated with a visible antireflection infrared cut-off film, and the infrared emergence surface of the beam splitter prism is provided with an infrared antireflection visible filter or coated with an infrared antireflection visible cut-off film.
10. The system according to claim 1, 8 or 9, wherein the focusing is performed by providing a sensor focusing mechanism on the dual spectrum photosensitive mechanism to focus the imaging quality of visible light and infrared light in two directions, respectively, wherein: the performance focusing of the visible light path is realized by adjusting the visible light sensor to move back and forth along the visible light axis direction in the visible light path; the performance focusing of the infrared light path is realized by adjusting the infrared sensor to move back and forth along the infrared optical axis direction in the infrared light path.
11. The system of claim 1, 2, 8 or 9, wherein the second lens group is in either of two configurations:
a. the device comprises the following components in sequence from an object side: the lens comprises a sixth lens with negative focal power and aspheric surfaces on two surfaces, a seventh lens with negative focal power, an eighth lens with positive focal power and a ninth lens with negative focal power and aspheric surfaces on two surfaces;
b. the device comprises the following components in sequence from an object side: the lens comprises a sixth lens with negative focal power, a seventh lens with negative focal power and aspheric surfaces on two surfaces, an eighth lens with positive focal power and a ninth lens with negative focal power and aspheric surfaces on two surfaces;
the third lens group has any one of the following two structures:
i. the device comprises the following components in sequence from an object side: a tenth lens having a positive power and a back surface being aspheric, an eleventh lens having a negative power, a twelfth lens having a positive power, a thirteenth lens having a negative power, and a fourteenth lens having a positive power and a back surface being aspheric, wherein the eleventh lens is cemented with the twelfth lens, the thirteenth lens is cemented with the fourteenth lens;
comprising, in order from the object side: a tenth lens having positive optical power and both surfaces being aspheric, an eleventh lens having negative optical power, a twelfth lens having positive optical power, a thirteenth lens having negative optical power, and a fourteenth lens having positive optical power, wherein the eleventh lens is cemented with the twelfth lens, the thirteenth lens is cemented with the fourteenth lens;
the fourth lens group sequentially comprises from the object side: a fifteenth lens having a negative optical power and a sixteenth lens having a positive optical power, wherein the fifteenth lens is cemented with the sixteenth lens;
the fifth lens group sequentially includes from the object side: the optical lens comprises a seventeenth lens with positive focal power, an eighteenth lens with negative focal power and a nineteenth lens with positive focal power and aspheric surfaces, wherein the seventeenth lens and the eighteenth lens are glued.
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| CN201810123282.2A CN108132527B (en) | 2018-02-07 | 2018-02-07 | Optical system with optimized low-light effect |
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| CN107450168A (en) * | 2017-09-05 | 2017-12-08 | 嘉兴中润光学科技有限公司 | In dolly-out, dolly-back interchangeable tight shot |
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| CN107450168A (en) * | 2017-09-05 | 2017-12-08 | 嘉兴中润光学科技有限公司 | In dolly-out, dolly-back interchangeable tight shot |
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