WO2024135126A1 - ズームレンズ、および撮像装置 - Google Patents

ズームレンズ、および撮像装置 Download PDF

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Publication number
WO2024135126A1
WO2024135126A1 PCT/JP2023/040022 JP2023040022W WO2024135126A1 WO 2024135126 A1 WO2024135126 A1 WO 2024135126A1 JP 2023040022 W JP2023040022 W JP 2023040022W WO 2024135126 A1 WO2024135126 A1 WO 2024135126A1
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Prior art keywords
lens group
lens
zoom lens
zoom
focal length
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PCT/JP2023/040022
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English (en)
French (fr)
Japanese (ja)
Inventor
翔平 菊池
孝平 植村
友里奈 西
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ソニーグループ株式会社
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Priority to JP2024565650A priority Critical patent/JPWO2024135126A1/ja
Publication of WO2024135126A1 publication Critical patent/WO2024135126A1/ja

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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
    • 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
    • G02B15/20—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 an additional movable lens or lens group for varying the objective focal length

Definitions

  • This disclosure relates to a zoom lens and an imaging device.
  • optical systems For imaging optical systems used in imaging devices (cameras), optical systems with various focal lengths and apertures are required depending on the application. For example, wide-angle zoom lenses are required to have high image quality, be small and lightweight, and have a short minimum shooting distance.
  • a zoom lens that satisfies these requirements there is a zoom lens that employs a negative lead type in which a lens group with negative refractive power is arranged closest to the object (see, for example, Patent Documents 1 and 2).
  • the zoom lens described in Patent Document 1 is configured to move the second lens group and the fourth lens group during focusing.
  • the zoom lens described in Patent Document 2 is configured to move two focus lens groups closer to the image plane than the aperture diaphragm during focusing.
  • the zoom lens described in Patent Document 1 is not optimally configured in terms of suppressing fluctuations in the angle of view during focusing, and in terms of achieving a short minimum shooting distance.
  • the zoom lens described in Patent Document 2 is not optimally configured in terms of achieving a short overall length, and in terms of achieving a short minimum shooting distance.
  • a zoom lens includes, in order from the object side to the image plane side, a first lens group having negative refractive power, an aperture stop, a focus lens group, a floating lens group, and a final lens group, and during zooming, at least the focus lens group, the floating lens group, and the final lens group move on different trajectories, and during focusing, the focus lens group and the floating lens group move on different trajectories, and the zoom lens satisfies the following conditional expression: 0.50 ⁇
  • An imaging device includes a zoom lens and an imaging element that outputs an imaging signal corresponding to an optical image formed by the zoom lens, and the zoom lens is configured by the zoom lens according to the embodiment of the present disclosure.
  • each lens group is optimized to suppress fluctuations in the angle of view during focusing while being small and lightweight, and to enable good correction of various aberrations at a short minimum shooting distance.
  • FIG. 1 is a lens cross-sectional view showing a first configuration example (Example 1) of a zoom lens according to an embodiment of the present disclosure.
  • FIG. 2 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 1 at the wide-angle end and when focused on infinity.
  • FIG. 3 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 1 when it is in the intermediate position and focused on infinity.
  • FIG. 4 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 1 at the telephoto end and focused on infinity.
  • FIG. 5 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 1 at the wide-angle end when focusing on a close object.
  • FIG. 1 is a lens cross-sectional view showing a first configuration example (Example 1) of a zoom lens according to an embodiment of the present disclosure.
  • FIG. 2 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 1 at the wide-angle end and when focused on infinity.
  • FIG. 6 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 1 at the intermediate position and when focusing on a close distance.
  • FIG. 7 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 1 at the telephoto end when focusing on a close object.
  • FIG. 8 is a lens cross-sectional view showing a second configuration example (Example 2) of the zoom lens according to the embodiment.
  • FIG. 9 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 2 at the wide-angle end and focused on infinity.
  • FIG. 10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 2 when it is in the intermediate position and focused on infinity.
  • FIG. 11 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 2 at the telephoto end and focused on infinity.
  • FIG. 12 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 2 at the wide-angle end when focusing on a close object.
  • FIG. 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 2 at the intermediate position and when focusing on a close distance.
  • FIG. 14 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 2 at the telephoto end when focusing on a close object.
  • FIG. 15 is a lens cross-sectional view showing a third configuration example (Example 3) of a zoom lens according to an embodiment.
  • FIG. 3 is an aberration diagram showing longitudinal aberration of the zoom lens according to an embodiment.
  • FIG. 16 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 3 at the wide-angle end and focused on infinity.
  • FIG. 17 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 3 when it is positioned at an intermediate point and focused on infinity.
  • FIG. 18 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 3 at the telephoto end and focused on infinity.
  • FIG. 19 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 3 at the wide-angle end when focusing on a close object.
  • FIG. 20 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 3 at the intermediate position and when focusing on a close distance.
  • FIG. 20 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 3 at the intermediate position and when focusing on a close distance.
  • FIG. 21 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 3 at the telephoto end when focusing on a close object.
  • FIG. 22 is a lens cross-sectional view showing a fourth configuration example (Example 4) of the zoom lens according to an embodiment.
  • FIG. 23 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 4 at the wide-angle end and when focused on infinity.
  • FIG. 24 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 4 when it is in the intermediate position and focused on infinity.
  • FIG. 25 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 4 at the telephoto end and when focused on infinity.
  • FIG. 26 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 4 at the wide-angle end when focusing on a close object.
  • FIG. 27 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 4 at the intermediate position and when focusing on a close distance.
  • FIG. 28 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 4 at the telephoto end when focusing on a close object.
  • FIG. 29 is a lens cross-sectional view showing a fifth configuration example (Example 5) of a zoom lens according to an embodiment.
  • FIG. 30 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 5 at the wide-angle end and when focused on infinity.
  • FIG. 31 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 5 at the intermediate position and focused on infinity.
  • FIG. 32 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 5 at the telephoto end and focused on infinity.
  • FIG. 33 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 5 at the wide-angle end when focusing on a close object.
  • FIG. 34 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 5 at the intermediate position and when focusing on a close distance.
  • FIG. 35 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 5 at the telephoto end when focusing on a close object.
  • FIG. 36 is a lens cross-sectional view showing a sixth configuration example (Example 6) of a zoom lens according to an embodiment.
  • FIG. 37 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 6 at the wide-angle end and when focused on infinity.
  • FIG. 38 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 6 when it is positioned at an intermediate point and focused on infinity.
  • FIG. 39 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 6 at the telephoto end and focused on infinity.
  • FIG. 40 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 6 at the wide-angle end when focusing on a close object.
  • FIG. 37 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 6 at the wide-angle end and when focused on infinity.
  • FIG. 38 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 6 when it is positioned at an intermediate point and focused on infinity.
  • FIG. 39
  • FIG. 41 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 6 at the intermediate position and when focusing on a close distance.
  • FIG. 42 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 6 at the telephoto end when focusing on a close object.
  • FIG. 43 is an explanatory diagram showing an overview of the sag amount of an aspheric lens.
  • FIG. 44 is a block diagram showing an example of the configuration of an imaging device.
  • FIG. 45 is a block diagram showing an example of a schematic configuration of a vehicle control system.
  • FIG. 46 is an explanatory diagram showing an example of the installation positions of the outside-vehicle information detection unit and the imaging unit.
  • FIG. 47 is a diagram illustrating an example of a schematic configuration of an endoscope system.
  • FIG. 48 is a block diagram showing an example of the functional configuration of the camera and the CCU shown in FIG. 47.
  • FIG. 49 is a diagram showing an example of a schematic configuration of
  • FIG. 1 illustrates a first configuration example of a zoom lens according to an embodiment of the present disclosure, which corresponds to the configuration of Example 1 described later.
  • FIG. 8 illustrates a second configuration example of a zoom lens according to an embodiment, which corresponds to the configuration of Example 2 described later.
  • FIG. 15 illustrates a third configuration example of a zoom lens according to an embodiment, which corresponds to the configuration of Example 3 described later.
  • FIG. 22 illustrates a fourth configuration example of a zoom lens according to an embodiment, which corresponds to the configuration of Example 4 described later.
  • FIG. 29 illustrates a fifth configuration example of a zoom lens according to an embodiment, which corresponds to the configuration of Example 5 described later.
  • FIG. 36 illustrates a sixth configuration example of a zoom lens according to an embodiment, which corresponds to the configuration of Example 6 described later.
  • Z1 indicates the optical axis.
  • An optical member such as a cover glass for protecting the image sensor may be disposed between the zoom lenses 1 to 6 according to the first to sixth configuration examples and the image plane IMG.
  • various optical filters such as a low-pass filter and an infrared cut filter may also be disposed as optical members.
  • the zoom lens includes, in order from the object side toward the image surface IMG side, at least a first lens group G1 having negative refractive power, an aperture stop St, a focus lens group, a floating lens group, and a final lens group.
  • the fourth lens group G4 is a focus lens group
  • the fifth lens group G5 is a floating lens group.
  • the fourth lens group G4 is a focus lens group
  • the sixth lens group G6 is a floating lens group.
  • the second lens group G2 is a focus lens group
  • the third lens group G3 is a floating lens group.
  • a “lens group” refers to a lens group that has refractive power and in which the spacing between adjacent lens groups changes during zooming.
  • a lens group is not defined as one that is composed only of flat plates that have no refractive power.
  • the spacing between adjacent lens groups changes when zooming from the wide-angle end to the telephoto end.
  • the upper row shows the lens arrangement at the wide-angle end (Wide) and focusing at infinity
  • the middle row shows the lens arrangement at the intermediate position (Mid) and focusing at infinity
  • the lower row shows the lens arrangement at the telephoto end (Tele) and focusing at infinity.
  • the zoom lens according to one embodiment may further satisfy certain conditional expressions, etc., which will be described later.
  • the configuration of each lens group is optimized so that the zoom lens is small and lightweight, yet suppresses fluctuations in the angle of view during focusing, and allows for good correction of various aberrations at a short minimum shooting distance.
  • This makes it possible to provide a zoom lens that is small and lightweight, yet suppresses fluctuations in the angle of view during focusing, and allows for good correction of various aberrations at a short minimum shooting distance, and an imaging device equipped with such a zoom lens.
  • focusing is performed using two lens groups arranged closer to the image plane IMG than the aperture stop St, thereby suppressing fluctuations in the angle of view during focusing while also suppressing fluctuations in aberration.
  • the final lens group may be configured not to move during focusing. This makes it less likely that dust particles or other foreign matter will enter the lens from the air.
  • a zoom lens according to an embodiment may satisfy the following conditional expression (1). 0.50 ⁇
  • Conditional formula (1) is a conditional formula for establishing an appropriate relationship between the focal length of the lens group with the weaker refractive power among the focus lens group and the floating lens group, and the focal length of the first lens group G1.
  • conditional formula (1) If the lower limit of conditional formula (1) is not met, the refractive power of the focus lens group or the floating lens group becomes too weak, making it difficult to achieve sufficient focus sensitivity, and making it difficult to achieve both a short overall length and a short minimum shooting distance. On the other hand, if the upper limit of conditional formula (1) is exceeded, the refractive power of the focus lens group or the floating lens group becomes too strong, causing large aberration fluctuations during focusing, making it difficult to achieve high image quality.
  • conditional expression (1) 0.53 ⁇
  • the zoom lens according to an embodiment may satisfy the following conditional expression (2), in addition to conditional expression (1). 0.77 ⁇
  • Conditional formula (2) is a conditional formula for establishing an appropriate relationship between the focus lens group and the floating lens group.
  • conditional formula (2) the two lens groups that move during focusing can have appropriate refractive power, and high image quality can be achieved while minimizing the stroke amount during focusing. If the lower limit of conditional formula (2) is exceeded, the refractive power of the focus lens group becomes too strong, causing large aberration fluctuations during focusing and making it difficult to achieve high image quality. On the other hand, if the upper limit of conditional formula (2) is exceeded, the refractive power of the floating lens group becomes too strong, making it difficult to achieve high image quality.
  • conditional expression (2) 0.79 ⁇
  • (i 2, ..., n+1).
  • Dga effective radius of light beam on the aspheric surface of the aspheric lens GA
  • Vga Abbe number of the aspheric lens GA
  • Nga refractive index of the aspheric lens GA
  • Lgaf distance from the object side surface of the aspheric lens GA to the image plane IMG Lexp: distance from the exit pupil of the zoom lens to the image plane IMG.
  • FIG. 43 shows an overview of the sag amount x of the aspheric lens GA.
  • the sag amount xn+1 at the position where the lens diameter y is the effective beam radius is x3 .
  • the lens L63 (FIGS. 1, 8, and 15) in the zoom lenses 1 to 3 according to Examples 1 to 3 corresponds to the aspheric lens GA.
  • conditional expressions (3) and (4) it is possible to produce a difference in shape between the center and periphery of the aspheric lens GA with respect to the optical axis Z1. This makes it possible to satisfactorily correct curvature of field and coma aberration. If the lower limit of conditional expression (3) and the lower limit of conditional expression (4) are not met, it is not possible to produce a difference in shape between the center and periphery of the aspheric lens GA with respect to the optical axis Z1, making it difficult to correct curvature of field and coma aberration. If the upper limit of conditional expression (3) is exceeded, it is necessary to give the aspheric lens GA a large amount of sag, making it difficult to stably manufacture lenses with high shape precision.
  • the lower limit of conditional expression (3) may be set to 0.013. This allows the difference in shape between the center and periphery of the aspheric lens GA with respect to the optical axis Z1 to be greater, thereby enabling better correction of field curvature and coma aberration.
  • the upper limit of conditional expression (3) may be set to 0.30. This allows the amount of sag to be reduced, allowing for more stable manufacture of lenses with higher shape accuracy.
  • the upper limit of conditional expression (3) may be set to 0.20. This allows for even smaller sag, allowing for even more stable manufacture of lenses with higher shape accuracy.
  • conditional formula (5) and conditional formula (6) a glass material with a high refractive index can be used for the aspherical lens GA, so that the aspherical lens GA can have a strong refractive power even if it has an aspherical shape with a small curvature. If the lower limit of conditional formula (5) or (6) is exceeded, the aspherical lens GA is required to have an aspherical shape with a larger curvature, so that the aspherical lens GA becomes more sensitive to decentering, making it difficult to produce it stably.
  • the specific gravity of the glass material is generally positively correlated with the refractive index, and the higher the specific gravity, the higher the refractive index tends to be, so that the aspherical lens GA becomes heavier, making it difficult to reduce the size and weight of the optical system.
  • the lower limit of conditional expression (7) may be set to 1.0. This will ensure a higher amount of peripheral light.
  • the upper limit of conditional expression (7) may be set to 16.0. This will allow the distance between the aspherical lens GA and the image surface IMG to be increased, further reducing the sensitivity to manufacturing errors of the aspherical lens GA.
  • the upper limit of conditional expression (7) may be set to 5.0. This will allow the distance between the aspherical lens GA and the image surface IMG to be increased further, further reducing the sensitivity to manufacturing errors of the aspherical lens GA.
  • the zoom lens according to one embodiment may be configured to further include at least one lens group having positive refractive power between the first lens group G1 and the focus lens group. This makes it possible to converge light rays incident on the focus lens group, and to reduce the diameter of the lens on the image plane IMG side, including the focus lens group.
  • a lens group that moves integrally with the final lens group during zooming may be provided between the first lens group G1 and the focus lens group. This makes it possible to reduce the number of lens groups that move during zooming, thereby improving the manufacturability of the lens.
  • the third lens group G3 moves integrally with the sixth lens group G6 as the final lens group during zooming.
  • the third lens group G3 moves integrally with the seventh lens group G7 as the final lens group during zooming.
  • At least one of the focus lens group and the floating lens group may be configured to move in opposite directions at the wide-angle end and the telephoto end during focusing. This allows both the focus lens group and the floating lens group to move to achieve focus even when there is little movement margin during focusing. Furthermore, when there is movement margin, movement can be performed with an emphasis on aberration correction that suppresses fluctuations in field curvature.
  • the zoom lens according to an embodiment may satisfy the following conditional expression (8). 0.1 ⁇
  • conditional expression (8) it is possible to achieve both high image quality and a short overall length. If the lower limit of conditional expression (8) is exceeded, the focal length of the first lens group G1 becomes too strong, making it difficult to control the Petzval sum and worsening the field curvature, which is undesirable. If the upper limit of conditional expression (8) is exceeded, it is advantageous for shortening the overall length, but the positive refractive power of the lens group closer to the image plane IMG than the first lens group G1 becomes too strong, making it difficult to correct spherical aberration and axial chromatic aberration, which is undesirable.
  • conditional expression (8) 0.15 ⁇
  • the zoom lens according to an embodiment may satisfy the following conditional expression (9). 1.0 ⁇
  • conditional expression (9) it is possible to achieve both a wide-angle focal length and high image quality. If the lower limit of conditional expression (9) is exceeded, the focal length of the first lens group G1 becomes too strong, making it difficult to control the Petzval sum and undesirably worsening the field curvature. If the upper limit of conditional expression (9) is exceeded, the focal length of the entire system becomes too short compared to the focal length of the first lens group G1, making it difficult to correct distortion and field curvature.
  • the focus lens group may have positive refractive power
  • the floating lens group may have negative refractive power
  • Figure 44 shows an example configuration of an imaging device 100 to which a zoom lens according to one embodiment is applied.
  • This imaging device 100 is, for example, a digital still camera, and includes a camera block 110, a camera signal processing unit 20, an image processing unit 30, an LCD (Liquid Crystal Display) 40, an R/W (Reader/Writer) 50, a CPU (Central Processing Unit) 60, an input unit 70, and a lens drive control unit 80.
  • a camera block 110 includes a camera block 110, a camera signal processing unit 20, an image processing unit 30, an LCD (Liquid Crystal Display) 40, an R/W (Reader/Writer) 50, a CPU (Central Processing Unit) 60, an input unit 70, and a lens drive control unit 80.
  • a camera signal processing unit 20 includes a camera signal processing unit 20, an image processing unit 30, an LCD (Liquid Crystal Display) 40, an R/W (Reader/Writer) 50, a CPU (Central Processing Unit) 60, an input unit 70, and a lens drive control unit
  • the camera block 110 is responsible for the imaging function and has an imaging lens 111 and an imaging element 112 such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor).
  • the imaging element 112 converts the optical image formed by the imaging lens 111 into an electrical signal, and outputs an imaging signal (image signal) corresponding to the optical image.
  • the zoom lenses 1 to 6 according to the configuration examples shown in FIG. 1 etc. can be applied as the imaging lens 111.
  • the camera signal processing unit 20 performs various signal processing operations on the image signal output from the image sensor 112, such as analog-to-digital conversion, noise removal, image quality correction, and conversion to luminance and color difference signals.
  • the image processing unit 30 performs recording and playback processing of image signals, and is configured to perform compression encoding and decompression decoding processing of image signals based on a specified image data format, as well as conversion processing of data specifications such as resolution.
  • the LCD 40 has the function of displaying various data such as the operation status of the user on the input unit 70 and captured images.
  • the R/W 50 writes image data encoded by the image processing unit 30 to the memory card 1000 and reads image data recorded on the memory card 1000.
  • the memory card 1000 is, for example, a semiconductor memory that can be inserted into and removed from a slot connected to the R/W 50.
  • the CPU 60 functions as a control processing unit that controls each circuit block provided in the imaging device 100, and controls each circuit block based on instruction input signals from the input unit 70.
  • the input unit 70 is made up of various switches and the like that are operated as required by the user.
  • the input unit 70 is composed of, for example, a shutter release button for performing shutter operations and a selection switch for selecting an operating mode, and is configured to output instruction input signals to the CPU 60 in response to user operations.
  • the lens drive control unit 80 controls the drive of the lenses arranged in the camera block 110, and is configured to control motors, not shown, that drive each lens of the imaging lens 111 based on control signals from the CPU 60.
  • an image signal corresponding to an image photographed by the camera block 110 is output to the LCD 40 via the camera signal processing unit 20 and displayed as a camera-through image. Also, when an instruction input signal for zooming or focusing is input from the input unit 70, the CPU 60 outputs a control signal to the lens drive control unit 80, and a predetermined lens of the imaging lens 111 moves under the control of the lens drive control unit 80.
  • the captured image signal is output from the camera signal processing unit 20 to the image processing unit 30, where it is compressed and encoded and converted into digital data in a specified data format.
  • the converted data is output to the R/W 50 and written to the memory card 1000.
  • Focusing is performed by the lens drive control unit 80 moving a specific lens of the imaging lens 111 based on a control signal from the CPU 60, for example, when the shutter release button on the input unit 70 is pressed halfway or fully pressed for recording (photographing).
  • the R/W 50 When playing back image data recorded on the memory card 1000, the R/W 50 reads out the specified image data from the memory card 1000 in response to an operation on the input unit 70, and after the image processing unit 30 performs decompression and decoding processing, the playback image signal is output to the LCD 40 and the playback image is displayed.
  • the imaging device was applied to a digital still camera, but the scope of application of the imaging device is not limited to digital still cameras, and it can be applied to various other imaging devices.
  • it can be applied to digital single-lens reflex cameras, digital non-reflex cameras, digital video cameras, and surveillance cameras. It can also be widely used as the camera section of digital input/output devices such as mobile phones with built-in cameras and information terminals with built-in cameras. It can also be applied to cameras with interchangeable lenses.
  • Si indicates the number of the i-th surface, with the numbers increasing from the closest to the object.
  • ri indicates the value (mm) of the paraxial radius of curvature of the i-th surface.
  • di indicates the value (mm) of the distance on the optical axis between the i-th surface and the (i+1)-th surface.
  • ndi indicates the value of the refractive index for the d-line (wavelength 587.6 nm) of the material of the optical element that has the i-th surface.
  • ⁇ di indicates the value of the Abbe number at the d-line of the material of the optical element that has the i-th surface.
  • ⁇ i indicates the value (mm) of the effective diameter of the i-th surface.
  • the portion where the value of "ri” is “ ⁇ ” indicates a flat surface, a diaphragm surface, etc.
  • ASP in the surface number (Si) column indicates that the surface is configured with an aspheric shape.
  • STO in the surface number column indicates that the aperture diaphragm St is arranged at the corresponding position.
  • OJ in the surface number column indicates that the surface in question is the object surface (subject surface).
  • IMG in the surface number column indicates that the surface in question is the image surface.
  • f indicates the focal length of the entire system (unit: mm).
  • Fno indicates the maximum aperture (F-number).
  • ⁇ indicates the half angle of view (unit: °).
  • Y indicates the image height (unit: mm).
  • L indicates the total optical length (the distance on the optical axis from the surface closest to the object to the image surface IMG) (unit: mm).
  • the lenses used in each embodiment have aspheric lens surfaces.
  • the aspheric shape is defined by the following formula.
  • "E-i” represents an exponential expression with the base 10, that is, “10 -i ", and for example, "0.12345E-05" represents “0.12345 ⁇ 10 -5 ".
  • [Table 1] shows basic lens data of the zoom lens 1 according to Example 1 shown in FIG. 1.
  • [Table 2] shows values of the focal length f, F-number, total angle of view 2 ⁇ , image height Y, and total optical length L of the entire system in the zoom lens 1 according to Example 1.
  • [Table 3] shows data of surface intervals that are variable during zooming and focusing in the zoom lens 1 according to Example 1.
  • [Table 2] shows values when the object distance (d0) is infinity for each of the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele).
  • [Table 3] shows values when the shooting distance and the object distance (d0) are infinity and close for each of the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele).
  • [Table 4] shows values of coefficients that represent the shape of the aspheric surface in the zoom lens 1 according to Example 1.
  • Table 5 shows the initial surface and focal length (unit: mm) of each lens group of the zoom lens 1 according to the first embodiment.
  • the zoom lens 1 in Example 1 is configured with a plurality of lens groups, the first lens group G1 to the sixth lens group G6, arranged in order from the object side to the image surface IMG side.
  • the first lens group G1 has negative refractive power.
  • the first lens group G1 consists of lenses L11 to L14, in order from the object side toward the image surface IMG side.
  • Lens L11 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L12 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L13 is a negative lens with a biconcave shape.
  • Lens L14 is a positive meniscus lens with a convex surface facing the object side.
  • the second lens group G2 has positive refractive power.
  • the second lens group G2 consists of, in order from the object side toward the image surface IMG side, lens L21 and lens L22.
  • Lens L21 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L22 is a positive meniscus lens with a convex surface facing the object side.
  • Lens L21 and lens L22 are cemented together to form a cemented lens.
  • the third lens group G3 has positive refractive power.
  • the third lens group G3 is composed of lens L31.
  • Lens L31 is a positive meniscus lens with a convex surface facing the object side.
  • the fourth lens group G4 has positive refractive power.
  • the fourth lens group G4 consists of lenses L41 to L43, in that order from the object side toward the image surface IMG side.
  • Lens L41 is a negative meniscus lens with its convex surface facing the object side.
  • Lens L42 is a positive biconvex lens.
  • Lens L43 is a positive biconvex lens.
  • Lenses L41 and L42 are cemented together to form a cemented lens.
  • the fifth lens group G5 has negative refractive power.
  • the fifth lens group G5 is composed of, in order from the object side toward the image surface IMG side, a lens L51 and a lens L52.
  • the lens L51 is a positive lens with a biconvex shape.
  • the lens L52 is a negative lens with a biconcave shape.
  • the lenses L51 and L52 are bonded together to form a cemented lens.
  • the sixth lens group G6 has positive refractive power.
  • the sixth lens group G6 is composed of lenses L61 to L63, in order from the object side to the image surface IMG side.
  • Lens L61 is a positive biconvex lens.
  • Lens L62 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L63 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L63 is an aspheric lens GA that satisfies the above conditional expressions (3) to (7).
  • each of the lens groups moves so that the spacing between adjacent lens groups changes.
  • the third lens group G3 moves together with the sixth lens group G6, which is the final lens group, during zooming.
  • the fourth lens group G4 is a focus lens group
  • the fifth lens group G5 is a floating lens group.
  • the fourth lens group G4 moves toward the object side
  • the fifth lens group G5 moves toward the image plane IMG side along different trajectories in the optical axis direction.
  • the fourth lens group G4 moves toward the image plane IMG side
  • the fifth lens group G5 moves toward the image plane IMG side along different trajectories in the optical axis direction.
  • the above configuration makes it possible to realize a compact, lightweight wide-angle zoom lens that provides high image quality and suppresses fluctuations in the angle of view when focusing.
  • FIG. 2 shows the longitudinal aberration of the zoom lens 1 of Example 1 at the wide-angle end and when focused on infinity.
  • FIG. 3 shows the longitudinal aberration of the zoom lens 1 of Example 1 at an intermediate position and when focused on infinity.
  • FIG. 4 shows the longitudinal aberration of the zoom lens 1 of Example 1 at the telephoto end and when focused on infinity.
  • FIG. 5 shows the longitudinal aberration of the zoom lens 1 of Example 1 at the wide-angle end and when focused on a close distance.
  • FIG. 6 shows the longitudinal aberration of the zoom lens 1 of Example 1 at an intermediate position and when focused on a close distance.
  • FIG. 7 shows the longitudinal aberration of the zoom lens 1 of Example 1 at the telephoto end and when focused on a close distance.
  • the zoom lens 1 of Example 1 has excellent imaging performance with various aberrations well corrected.
  • Table 6 shows basic lens data of the zoom lens 2 according to Example 2 shown in FIG. 8.
  • Table 7 shows values of the focal length f, F-number, total angle of view 2 ⁇ , image height Y, and total optical length L of the entire system in the zoom lens 2 according to Example 2.
  • Table 8 shows data of surface intervals that are variable during zooming and focusing in the zoom lens 2 according to Example 2. Note that Table 7 shows values when the object distance (d0) is infinity for each of the wide-angle end (Wide), middle position (Mid), and telephoto end (Tele). Table 8 shows values when the shooting distance and the object distance (d0) are infinity and close for each of the wide-angle end (Wide), middle position (Mid), and telephoto end (Tele).
  • Table 9 shows values of coefficients that represent the shape of the aspheric surface in the zoom lens 2 according to Example 2.
  • Table 10 shows the initial surface and focal length (unit: mm) of each lens group of the zoom lens 2 according to Example 2.
  • the zoom lens 2 in Example 2 is configured with multiple lens groups, the first lens group G1 to the sixth lens group G6, arranged in order from the object side to the image surface IMG side.
  • the first lens group G1 has negative refractive power.
  • the first lens group G1 consists of lenses L11 to L14, in order from the object side toward the image surface IMG side.
  • Lens L11 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L12 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L13 is a negative lens with a biconcave shape.
  • Lens L14 is a positive meniscus lens with a convex surface facing the object side.
  • the second lens group G2 has positive refractive power.
  • the second lens group G2 consists of, in order from the object side toward the image surface IMG side, lens L21 and lens L22.
  • Lens L21 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L22 is a positive meniscus lens with a convex surface facing the object side.
  • Lens L21 and lens L22 are cemented together to form a cemented lens.
  • the third lens group G3 has positive refractive power.
  • the third lens group G3 is composed of lens L31.
  • Lens L31 is a positive meniscus lens with a convex surface facing the object side.
  • the fourth lens group G4 has positive refractive power.
  • the fourth lens group G4 consists of lenses L41 to L43, in that order from the object side toward the image surface IMG side.
  • Lens L41 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L42 is a positive meniscus lens with a convex surface facing the object side.
  • Lens L43 is a positive lens with a biconvex shape.
  • Lenses L41 and L42 are cemented together to form a cemented lens.
  • the fifth lens group G5 has negative refractive power.
  • the fifth lens group G5 is composed of, in order from the object side toward the image surface IMG side, a lens L51 and a lens L52.
  • the lens L51 is a positive lens with a biconvex shape.
  • the lens L52 is a negative lens with a biconcave shape.
  • the lenses L51 and L52 are bonded together to form a cemented lens.
  • the sixth lens group G6 has positive refractive power.
  • the sixth lens group G6 is composed of lenses L61 to L63, in order from the object side to the image surface IMG side.
  • Lens L61 is a positive biconvex lens.
  • Lens L62 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L63 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L63 is an aspheric lens GA that satisfies the above conditional expressions (3) to (7).
  • each of the lens groups moves so that the spacing between adjacent lens groups changes.
  • the third lens group G3 moves together with the sixth lens group G6, which is the final lens group, during zooming.
  • the fourth lens group G4 is a focus lens group
  • the fifth lens group G5 is a floating lens group.
  • the fourth lens group G4 moves toward the object side
  • the fifth lens group G5 moves toward the image plane IMG side along different trajectories in the optical axis direction.
  • the fourth lens group G4 moves toward the image plane IMG side
  • the fifth lens group G5 moves toward the image plane IMG side along different trajectories in the optical axis direction.
  • the above configuration makes it possible to realize a small, lightweight wide-angle zoom lens that provides high image quality and suppresses fluctuations in the angle of view when focusing.
  • FIG. 9 shows the longitudinal aberration of the zoom lens 2 of Example 2 at the wide-angle end and when focused on infinity.
  • FIG. 10 shows the longitudinal aberration of the zoom lens 2 of Example 2 at the intermediate position and when focused on infinity.
  • FIG. 11 shows the longitudinal aberration of the zoom lens 2 of Example 2 at the telephoto end and when focused on infinity.
  • FIG. 12 shows the longitudinal aberration of the zoom lens 2 of Example 2 at the wide-angle end and when focused on a close distance.
  • FIG. 13 shows the longitudinal aberration of the zoom lens 2 of Example 2 at the intermediate position and when focused on a close distance.
  • FIG. 14 shows the longitudinal aberration of the zoom lens 2 of Example 2 at the telephoto end and when focused on a close distance.
  • the zoom lens 2 according to Example 2 has excellent imaging performance with various aberrations well corrected.
  • Table 11 shows basic lens data of the zoom lens 3 according to Example 3 shown in FIG. 15.
  • Table 12 shows values of the focal length f, F value, total angle of view 2 ⁇ , image height Y, and total optical length L of the entire system in the zoom lens 3 according to Example 3.
  • Table 13 shows data of surface intervals that are variable during zooming and focusing in the zoom lens 3 according to Example 3.
  • Table 12 shows values when the object distance (d0) is infinity for each of the wide-angle end (Wide), middle position (Mid), and telephoto end (Tele).
  • Table 13 shows values when the shooting distance and the object distance (d0) are infinity and close for each of the wide-angle end (Wide), middle position (Mid), and telephoto end (Tele).
  • Table 14 shows values of coefficients that represent the shape of the aspheric surface in the zoom lens 3 according to Example 3.
  • Table 15 shows the initial surface and focal length (unit: mm) of each lens group of the zoom lens 3 according to Example 3.
  • the zoom lens 3 in Example 3 is configured with multiple lens groups, the first lens group G1 to the sixth lens group G6, arranged in order from the object side to the image surface IMG side.
  • the first lens group G1 has negative refractive power.
  • the first lens group G1 consists of lenses L11 to L14, in order from the object side to the image surface IMG side.
  • Lens L11 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L12 is a positive meniscus lens with a convex surface facing the object side.
  • Lens L13 is a negative lens with a biconcave shape.
  • Lens L14 is a positive meniscus lens with a convex surface facing the object side.
  • the second lens group G2 has positive refractive power.
  • the second lens group G2 is composed of, in order from the object side toward the image surface IMG side, a lens L21 and a lens L22.
  • the lens L21 is a negative meniscus lens with a convex surface facing the object side.
  • the lens L22 is a positive lens with a biconvex shape.
  • the lenses L21 and L22 are cemented together to form a cemented lens.
  • the third lens group G3 has positive refractive power.
  • the third lens group G3 is composed of lens L31.
  • Lens L31 is a positive meniscus lens with a convex surface facing the object side.
  • the fourth lens group G4 has positive refractive power.
  • the fourth lens group G4 consists of lenses L41 to L43, in that order from the object side toward the image surface IMG side.
  • Lens L41 is a negative meniscus lens with its convex surface facing the object side.
  • Lens L42 is a positive biconvex lens.
  • Lens L43 is a positive biconvex lens.
  • Lenses L41 and L42 are cemented together to form a cemented lens.
  • the fifth lens group G5 has negative refractive power.
  • the fifth lens group G5 is composed of, in order from the object side toward the image surface IMG side, a lens L51 and a lens L52.
  • the lens L51 is a positive meniscus lens with a convex surface facing the image surface IMG side.
  • the lens L52 is a negative lens with a biconcave shape.
  • the lenses L51 and L52 are cemented together to form a cemented lens.
  • the sixth lens group G6 has positive refractive power.
  • the sixth lens group G6 is composed of lenses L61 to L63, in order from the object side to the image surface IMG side.
  • Lens L61 is a positive biconvex lens.
  • Lens L62 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L63 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L63 is an aspheric lens GA that satisfies the above conditional expressions (3) to (7).
  • each of the lens groups moves so that the spacing between adjacent lens groups changes.
  • the third lens group G3 moves together with the sixth lens group G6, which is the final lens group, during zooming.
  • the fourth lens group G4 is a focus lens group
  • the fifth lens group G5 is a floating lens group.
  • the fourth lens group G4 moves toward the object side
  • the fifth lens group G5 moves toward the image plane IMG side along different trajectories in the optical axis direction.
  • the fourth lens group G4 moves toward the image plane IMG side
  • the fifth lens group G5 moves toward the image plane IMG side along different trajectories in the optical axis direction.
  • the above configuration makes it possible to realize a compact, lightweight wide-angle zoom lens that provides high image quality and suppresses fluctuations in the angle of view when focusing.
  • FIG. 16 shows the longitudinal aberration of the zoom lens 3 of Example 3 at the wide-angle end and when focused on infinity.
  • FIG. 17 shows the longitudinal aberration of the zoom lens 3 of Example 3 at the intermediate position and when focused on infinity.
  • FIG. 18 shows the longitudinal aberration of the zoom lens 3 of Example 3 at the telephoto end and when focused on infinity.
  • FIG. 19 shows the longitudinal aberration of the zoom lens 3 of Example 3 at the wide-angle end and when focused on a close distance.
  • FIG. 20 shows the longitudinal aberration of the zoom lens 3 of Example 3 at the intermediate position and when focused on a close distance.
  • FIG. 21 shows the longitudinal aberration of the zoom lens 3 of Example 3 at the telephoto end and when focused on a close distance.
  • the zoom lens 3 of Example 3 has excellent imaging performance with various aberrations well corrected.
  • Table 16 shows basic lens data of the zoom lens 4 according to Example 4 shown in FIG. 22.
  • Table 17 shows values of the focal length f, F-number, total angle of view 2 ⁇ , image height Y, and total optical length L of the entire system in the zoom lens 4 according to Example 4.
  • Table 18 shows data of surface intervals that are variable during zooming and focusing in the zoom lens 4 according to Example 4.
  • Table 17 shows values when the object distance (d0) is infinity for each of the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele).
  • Table 18 shows values when the shooting distance and the object distance (d0) are infinity and close for each of the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele).
  • Table 19 shows values of coefficients that represent the shape of the aspheric surface in the zoom lens 4 according to Example 4.
  • Table 20 shows the initial surface and focal length (unit: mm) of each lens group of the zoom lens 4 according to Example 4.
  • the zoom lens 4 in Example 4 is configured with multiple lens groups, the first lens group G1 to the sixth lens group G6, arranged in order from the object side to the image surface IMG side.
  • the first lens group G1 has negative refractive power.
  • the first lens group G1 consists of lenses L11 to L14, in order from the object side toward the image surface IMG side.
  • Lens L11 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L12 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L13 is a negative lens with a biconcave shape.
  • Lens L14 is a positive meniscus lens with a convex surface facing the object side.
  • the second lens group G2 has positive refractive power.
  • the second lens group G2 consists of, in order from the object side toward the image surface IMG side, lens L21 and lens L22.
  • Lens L21 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L22 is a positive meniscus lens with a convex surface facing the object side.
  • Lens L21 and lens L22 are cemented together to form a cemented lens.
  • the third lens group G3 has positive refractive power.
  • the third lens group G3 is composed of lens L31.
  • Lens L31 is a positive meniscus lens with a convex surface facing the object side.
  • the fourth lens group G4 has positive refractive power.
  • the fourth lens group G4 consists of lenses L41 to L43, in that order from the object side toward the image surface IMG side.
  • Lens L41 is a negative meniscus lens with its convex surface facing the object side.
  • Lens L42 is a positive biconvex lens.
  • Lens L43 is a positive biconvex lens.
  • Lenses L41 and L42 are cemented together to form a cemented lens.
  • the fifth lens group G5 has negative refractive power.
  • the fifth lens group G5 is composed of, in order from the object side toward the image surface IMG side, a lens L51 and a lens L52.
  • the lens L51 is a positive lens with a biconvex shape.
  • the lens L52 is a negative lens with a biconcave shape.
  • the lenses L51 and L52 are bonded together to form a cemented lens.
  • the sixth lens group G6 has positive refractive power.
  • the sixth lens group G6 is composed of lenses L61 to L63, in that order from the object side toward the image surface IMG side.
  • Lens L61 is a positive biconvex lens.
  • Lens L62 is a positive meniscus lens with its convex surface facing the image surface IMG side.
  • Lens L63 is a negative biconcave lens.
  • Lenses L62 and L63 are cemented together to form a cemented lens.
  • each of the lens groups moves so that the spacing between adjacent lens groups changes.
  • the third lens group G3 moves together with the sixth lens group G6, which is the final lens group, during zooming.
  • the fourth lens group G4 is a focus lens group
  • the fifth lens group G5 is a floating lens group.
  • the fourth lens group G4 moves toward the object side
  • the fifth lens group G5 moves toward the object side along different trajectories in the optical axis direction.
  • the fourth lens group G4 moves toward the image plane IMG side
  • the fifth lens group G5 moves toward the image plane IMG side along different trajectories in the optical axis direction.
  • the above configuration makes it possible to realize a small, lightweight wide-angle zoom lens that provides high image quality and suppresses fluctuations in the angle of view when focusing.
  • FIG. 23 shows the longitudinal aberration of the zoom lens 4 of Example 4 at the wide-angle end and when focused on infinity.
  • FIG. 24 shows the longitudinal aberration of the zoom lens 4 of Example 4 at the intermediate position and when focused on infinity.
  • FIG. 25 shows the longitudinal aberration of the zoom lens 4 of Example 4 at the telephoto end and when focused on infinity.
  • FIG. 26 shows the longitudinal aberration of the zoom lens 4 of Example 4 at the wide-angle end and when focused on a close distance.
  • FIG. 27 shows the longitudinal aberration of the zoom lens 4 of Example 4 at the intermediate position and when focused on a close distance.
  • FIG. 28 shows the longitudinal aberration of the zoom lens 4 of Example 4 at the telephoto end and when focused on a close distance.
  • the zoom lens 4 of Example 4 has excellent imaging performance with various aberrations well corrected.
  • Table 21 shows basic lens data of the zoom lens 5 according to Example 5 shown in FIG. 29.
  • Table 22 shows values of the focal length f, F-number, total angle of view 2 ⁇ , image height Y, and total optical length L of the entire system in the zoom lens 5 according to Example 5.
  • Table 23 shows data of surface intervals that are variable during zooming and focusing in the zoom lens 5 according to Example 5.
  • Table 22 shows values when the object distance (d0) is infinity for each of the wide-angle end (Wide), middle position (Mid), and telephoto end (Tele).
  • Table 23 shows values when the shooting distance and the object distance (d0) are infinity and close for each of the wide-angle end (Wide), middle position (Mid), and telephoto end (Tele).
  • Table 24 shows values of coefficients that represent the shape of the aspheric surface in the zoom lens 5 according to Example 5.
  • Table 25 shows the initial surface and focal length (unit: mm) of each lens group of the zoom lens 5 according to Example 5.
  • the zoom lens 5 in Example 5 is configured with multiple lens groups, the first lens group G1 to the seventh lens group G7, arranged in order from the object side to the image surface IMG side.
  • the first lens group G1 has negative refractive power.
  • the first lens group G1 consists of lenses L11 to L14, in order from the object side toward the image surface IMG side.
  • Lens L11 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L12 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L13 is a negative lens with a biconcave shape.
  • Lens L14 is a positive meniscus lens with a convex surface facing the object side.
  • the second lens group G2 has positive refractive power.
  • the second lens group G2 consists of, in order from the object side toward the image surface IMG side, lens L21 and lens L22.
  • Lens L21 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L22 is a positive meniscus lens with a convex surface facing the object side.
  • Lens L21 and lens L22 are cemented together to form a cemented lens.
  • the third lens group G3 has positive refractive power.
  • the third lens group G3 is composed of lens L31.
  • Lens L31 is a positive lens with a biconvex shape.
  • the fourth lens group G4 has positive refractive power.
  • the fourth lens group G4 consists of lenses L41 to L43, in that order from the object side toward the image surface IMG side.
  • Lens L41 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L42 is a positive meniscus lens with a convex surface facing the object side.
  • Lens L43 is a positive lens with a biconvex shape.
  • Lenses L41 and L42 are cemented together to form a cemented lens.
  • the fifth lens group G5 has negative refractive power.
  • the fifth lens group G5 is composed of lens L51.
  • Lens L51 is a negative meniscus lens with a convex surface facing the image plane IMG.
  • the sixth lens group G6 has negative refractive power.
  • the sixth lens group G6 is composed of, in order from the object side toward the image surface IMG side, a lens L61 and a lens L62.
  • the lens L61 is a positive lens with a biconvex shape.
  • the lens L62 is a negative lens with a biconcave shape.
  • the lenses L61 and L62 are bonded together to form a cemented lens.
  • the seventh lens group G7 has positive refractive power.
  • the seventh lens group G7 is composed of lenses L71 to L73, in that order from the object side toward the image surface IMG side.
  • Lens L71 is a positive biconvex lens.
  • Lens L72 is a positive biconvex lens.
  • Lens L73 is a negative biconcave lens.
  • Lenses L72 and L73 are bonded together to form a cemented lens.
  • each of the lens groups from the first lens group G1 to the seventh lens group G7 moves so that the spacing between adjacent lens groups changes.
  • the third lens group G3 moves together with the seventh lens group G7, which is the final lens group, during zooming.
  • the fourth lens group G4 is a focus lens group
  • the sixth lens group G6 is a floating lens group.
  • the fourth lens group G4 moves toward the object side
  • the sixth lens group G6 moves toward the object side along the optical axis on different trajectories.
  • the fourth lens group G4 moves toward the object side
  • the sixth lens group G6 moves toward the image plane IMG side along different trajectories.
  • the above configuration makes it possible to realize a compact, lightweight wide-angle zoom lens that provides high image quality and suppresses fluctuations in the angle of view when focusing.
  • FIG. 30 shows the longitudinal aberration of the zoom lens 5 of Example 5 at the wide-angle end and when focused on infinity.
  • FIG. 31 shows the longitudinal aberration of the zoom lens 5 of Example 5 at the intermediate position and when focused on infinity.
  • FIG. 32 shows the longitudinal aberration of the zoom lens 5 of Example 5 at the telephoto end and when focused on infinity.
  • FIG. 33 shows the longitudinal aberration of the zoom lens 5 of Example 5 at the wide-angle end and when focused on a close distance.
  • FIG. 34 shows the longitudinal aberration of the zoom lens 5 of Example 5 at the intermediate position and when focused on a close distance.
  • FIG. 35 shows the longitudinal aberration of the zoom lens 5 of Example 5 at the telephoto end and when focused on a close distance.
  • the zoom lens 5 of Example 5 has excellent imaging performance with various aberrations well corrected.
  • [Table 26] shows basic lens data of the zoom lens 6 according to Example 6 shown in FIG. 36.
  • [Table 27] shows values of the focal length f, F value, total angle of view 2 ⁇ , image height Y, and total optical length L of the entire system in the zoom lens 6 according to Example 6.
  • [Table 28] shows data of surface intervals that are variable during zooming and focusing in the zoom lens 6 according to Example 6.
  • [Table 27] shows values when the object distance (d0) is infinity for each of the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele).
  • [Table 28] shows values when the shooting distance and the object distance (d0) are infinity and close for each of the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele).
  • [Table 29] shows values of coefficients that represent the shape of the aspheric surface in the zoom lens 6 according to Example 6.
  • Table 30 shows the initial surface and focal length (unit: mm) of each lens group of the zoom lens 6 according to Example 6.
  • the zoom lens 6 in Example 6 is configured with a plurality of lens groups, the first lens group G1 to the fourth lens group G4, arranged in order from the object side to the image surface IMG side.
  • the first lens group G1 has negative refractive power.
  • the first lens group G1 consists of lenses L11 to L14, in order from the object side toward the image surface IMG side.
  • Lens L11 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L12 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L13 is a negative lens with a biconcave shape.
  • Lens L14 is a positive lens with a biconvex shape.
  • the second lens group G2 has positive refractive power.
  • the second lens group G2 is composed of lenses L21 to L23, in that order from the object side toward the image surface IMG side.
  • Lens L21 is a negative meniscus lens with a convex surface facing the object side.
  • Lens L22 is a positive meniscus lens with a convex surface facing the object side.
  • Lens L23 is a positive lens with a biconvex shape.
  • Lenses L21 and L22 are cemented together to form a cemented lens.
  • the third lens group G3 has negative refractive power.
  • the third lens group G3 is composed of lenses L31 to L33, in that order from the object side toward the image surface IMG side.
  • Lens L31 is a negative meniscus lens with a convex surface facing the image surface IMG side.
  • Lens L32 is a positive meniscus lens with a convex surface facing the image surface IMG side.
  • Lens L33 is a negative lens with a biconcave shape. Lenses L32 and L33 are cemented together to form a cemented lens.
  • the fourth lens group G4 has positive refractive power.
  • the fourth lens group G4 is composed of lenses L41 to L43, in that order from the object side toward the image surface IMG side.
  • Lens L41 is a positive biconvex lens.
  • Lens L42 is a positive biconvex lens.
  • Lens L43 is a negative biconcave lens.
  • Lenses L42 and L43 are bonded together to form a cemented lens.
  • each of the lens groups When zooming from the wide-angle end to the telephoto end, each of the lens groups, first lens group G1 through fourth lens group G4, moves so that the spacing between adjacent lens groups changes.
  • the second lens group G2 is a focus lens group
  • the third lens group G3 is a floating lens group.
  • the second lens group G2 moves toward the object side
  • the third lens group G3 moves toward the object side along the optical axis on different trajectories.
  • the second lens group G2 moves toward the object side
  • the third lens group G3 moves toward the image plane IMG side along different trajectories.
  • the above configuration makes it possible to realize a small, lightweight wide-angle zoom lens that provides high image quality and suppresses fluctuations in the angle of view when focusing.
  • FIG. 37 shows the longitudinal aberration of the zoom lens 6 of Example 6 at the wide-angle end and when focused on infinity.
  • FIG. 38 shows the longitudinal aberration of the zoom lens 6 of Example 6 at the intermediate position and when focused on infinity.
  • FIG. 39 shows the longitudinal aberration of the zoom lens 6 of Example 6 at the telephoto end and when focused on infinity.
  • FIG. 40 shows the longitudinal aberration of the zoom lens 6 of Example 6 at the wide-angle end and when focused on a close distance.
  • FIG. 41 shows the longitudinal aberration of the zoom lens 6 of Example 6 at the intermediate position and when focused on a close distance.
  • FIG. 42 shows the longitudinal aberration of the zoom lens 6 of Example 6 at the telephoto end and when focused on a close distance.
  • the zoom lens 6 of Example 6 has excellent imaging performance with various aberrations well corrected.
  • Tables 31 to 32 show the values for each of the above conditional expressions for each example. As can be seen from Table 32, the values for each example are within the numerical range for each conditional expression.
  • the technology according to the present disclosure can be applied to various products.
  • the technology according to the present disclosure may be realized as a device mounted on any type of moving body, such as an automobile, an electric vehicle, a hybrid electric vehicle, a motorcycle, a bicycle, a personal mobility device, an airplane, a drone, a ship, a robot, a construction machine, or an agricultural machine (tractor).
  • FIG. 45 is a block diagram showing a schematic configuration example of a vehicle control system 7000, which is an example of a mobile object control system to which the technology disclosed herein can be applied.
  • the vehicle control system 7000 includes a plurality of electronic control units connected via a communication network 7010.
  • the vehicle control system 7000 includes a drive system control unit 7100, a body system control unit 7200, a battery control unit 7300, an outside vehicle information detection unit 7400, an inside vehicle information detection unit 7500, and an integrated control unit 7600.
  • the communication network 7010 connecting these multiple control units may be an in-vehicle communication network conforming to any standard, such as CAN (Controller Area Network), LIN (Local Interconnect Network), LAN (Local Area Network), or FlexRay (registered trademark).
  • CAN Controller Area Network
  • LIN Local Interconnect Network
  • LAN Local Area Network
  • FlexRay registered trademark
  • Each control unit includes a microcomputer that performs arithmetic processing according to various programs, a storage unit that stores the programs executed by the microcomputer or parameters used in various calculations, and a drive circuit that drives various devices to be controlled.
  • Each control unit includes a network I/F for communicating with other control units via a communication network 7010, and a communication I/F for communicating with devices or sensors inside and outside the vehicle by wired or wireless communication.
  • the functional configuration of the integrated control unit 7600 includes a microcomputer 7610, a general-purpose communication I/F 7620, a dedicated communication I/F 7630, a positioning unit 7640, a beacon receiving unit 7650, an in-vehicle device I/F 7660, an audio/image output unit 7670, an in-vehicle network I/F 7680, and a storage unit 7690.
  • Other control units also include a microcomputer, a communication I/F, a storage unit, and the like.
  • the drive system control unit 7100 controls the operation of devices related to the drive system of the vehicle in accordance with various programs.
  • the drive system control unit 7100 functions as a control device for a drive force generating device for generating drive force for the vehicle, such as an internal combustion engine or a drive motor, a drive force transmission mechanism for transmitting drive force to the wheels, a steering mechanism for adjusting the steering angle of the vehicle, and a braking device for generating braking force for the vehicle.
  • the drive system control unit 7100 may also function as a control device for an ABS (Antilock Brake System) or an ESC (Electronic Stability Control), etc.
  • the drive system control unit 7100 is connected to a vehicle state detection unit 7110.
  • the vehicle state detection unit 7110 includes at least one of a gyro sensor that detects the angular velocity of the axial rotational motion of the vehicle body, an acceleration sensor that detects the acceleration of the vehicle, or a sensor for detecting the amount of operation of the accelerator pedal, the amount of operation of the brake pedal, the steering angle of the steering wheel, the engine speed, or the rotation speed of the wheels, etc.
  • the drive system control unit 7100 performs arithmetic processing using the signal input from the vehicle state detection unit 7110, and controls the internal combustion engine, the drive motor, the electric power steering device, the brake device, etc.
  • the body system control unit 7200 controls the operation of various devices installed in the vehicle body according to various programs.
  • the body system control unit 7200 functions as a control device for a keyless entry system, a smart key system, a power window device, or various lamps such as headlamps, tail lamps, brake lamps, turn signals, and fog lamps.
  • radio waves or signals from various switches transmitted from a portable device that replaces a key can be input to the body system control unit 7200.
  • the body system control unit 7200 accepts the input of these radio waves or signals and controls the vehicle's door lock device, power window device, lamps, etc.
  • the battery control unit 7300 controls the secondary battery 7310, which is the power supply source for the drive motor, according to various programs. For example, information such as the battery temperature, battery output voltage, or remaining capacity of the battery is input to the battery control unit 7300 from a battery device equipped with the secondary battery 7310. The battery control unit 7300 performs calculations using these signals, and controls the temperature regulation of the secondary battery 7310 or a cooling device or the like equipped in the battery device.
  • the outside vehicle information detection unit 7400 detects information outside the vehicle equipped with the vehicle control system 7000.
  • an imaging unit 7410 and an outside vehicle information detection unit 7420 is connected to the outside vehicle information detection unit 7400.
  • the imaging unit 7410 includes at least one of a ToF (Time Of Flight) camera, a stereo camera, a monocular camera, an infrared camera, and other cameras.
  • the outside vehicle information detection unit 7420 includes at least one of an environmental sensor for detecting the current weather or climate, or a surrounding information detection sensor for detecting other vehicles, obstacles, pedestrians, etc., around the vehicle equipped with the vehicle control system 7000.
  • the environmental sensor may be, for example, at least one of a raindrop sensor that detects rain, a fog sensor that detects fog, a sunshine sensor that detects the level of sunlight, and a snow sensor that detects snowfall.
  • the surrounding information detection sensor may be at least one of an ultrasonic sensor, a radar device, and a LIDAR (Light Detection and Ranging, Laser Imaging Detection and Ranging) device.
  • the imaging unit 7410 and the outside vehicle information detection unit 7420 may each be provided as an independent sensor or device, or may be provided as a device in which multiple sensors or devices are integrated.
  • FIG. 46 shows an example of the installation positions of the imaging unit 7410 and the outside vehicle information detection unit 7420.
  • the imaging units 7910, 7912, 7914, 7916, and 7918 are provided, for example, at least one of the front nose, side mirrors, rear bumper, back door, and the upper part of the windshield inside the vehicle cabin of the vehicle 7900.
  • the imaging unit 7910 provided on the front nose and the imaging unit 7918 provided on the upper part of the windshield inside the vehicle cabin mainly acquire images of the front of the vehicle 7900.
  • the imaging units 7912 and 7914 provided on the side mirrors mainly acquire images of the sides of the vehicle 7900.
  • the imaging unit 7916 provided on the rear bumper or back door mainly acquires images of the rear of the vehicle 7900.
  • the imaging unit 7918, which is installed on the top of the windshield inside the vehicle is primarily used to detect preceding vehicles, pedestrians, obstacles, traffic signals, traffic signs, lanes, etc.
  • FIG. 46 shows an example of the imaging ranges of the imaging units 7910, 7912, 7914, and 7916.
  • Imaging range a indicates the imaging range of the imaging unit 7910 provided on the front nose
  • imaging ranges b and c indicate the imaging ranges of the imaging units 7912 and 7914 provided on the side mirrors, respectively
  • imaging range d indicates the imaging range of the imaging unit 7916 provided on the rear bumper or back door.
  • an overhead image of the vehicle 7900 viewed from above is obtained by superimposing the image data captured by the imaging units 7910, 7912, 7914, and 7916.
  • External information detection units 7920, 7922, 7924, 7926, 7928, and 7930 provided on the front, rear, sides, corners, and upper part of the windshield inside the vehicle 7900 may be, for example, ultrasonic sensors or radar devices.
  • External information detection units 7920, 7926, and 7930 provided on the front nose, rear bumper, back door, and upper part of the windshield inside the vehicle 7900 may be, for example, LIDAR devices. These external information detection units 7920 to 7930 are mainly used to detect preceding vehicles, pedestrians, obstacles, etc.
  • the outside-vehicle information detection unit 7400 causes the imaging unit 7410 to capture an image outside the vehicle, and receives the captured image data.
  • the outside-vehicle information detection unit 7400 also receives detection information from the connected outside-vehicle information detection unit 7420. If the outside-vehicle information detection unit 7420 is an ultrasonic sensor, a radar device, or a LIDAR device, the outside-vehicle information detection unit 7400 transmits ultrasonic waves or electromagnetic waves, and receives information on the received reflected waves.
  • the outside-vehicle information detection unit 7400 may perform object detection processing or distance detection processing for people, cars, obstacles, signs, or characters on the road surface, based on the received information.
  • the outside-vehicle information detection unit 7400 may perform environmental recognition processing for recognizing rainfall, fog, road surface conditions, etc., based on the received information.
  • the outside-vehicle information detection unit 7400 may calculate the distance to an object outside the vehicle based on the received information.
  • the outside vehicle information detection unit 7400 may also perform image recognition processing or distance detection processing to recognize people, cars, obstacles, signs, or characters on the road surface based on the received image data.
  • the outside vehicle information detection unit 7400 may perform processing such as distortion correction or alignment on the received image data, and may also generate an overhead image or a panoramic image by synthesizing image data captured by different imaging units 7410.
  • the outside vehicle information detection unit 7400 may also perform viewpoint conversion processing using image data captured by different imaging units 7410.
  • the in-vehicle information detection unit 7500 detects information inside the vehicle.
  • a driver state detection unit 7510 that detects the state of the driver is connected to the in-vehicle information detection unit 7500.
  • the driver state detection unit 7510 may include a camera that captures an image of the driver, a biosensor that detects the driver's biometric information, or a microphone that collects sound inside the vehicle.
  • the biosensor is provided, for example, on the seat or steering wheel, and detects the biometric information of a passenger sitting in the seat or a driver gripping the steering wheel.
  • the in-vehicle information detection unit 7500 may calculate the degree of fatigue or concentration of the driver based on the detection information input from the driver state detection unit 7510, or may determine whether the driver is dozing off.
  • the in-vehicle information detection unit 7500 may perform processing such as noise canceling on the collected sound signal.
  • the integrated control unit 7600 controls the overall operation of the vehicle control system 7000 according to various programs.
  • An input unit 7800 is connected to the integrated control unit 7600.
  • the input unit 7800 is realized by a device that can be operated by the passenger, such as a touch panel, a button, a microphone, a switch, or a lever. Data obtained by voice recognition of a voice input by a microphone may be input to the integrated control unit 7600.
  • the input unit 7800 may be, for example, a remote control device using infrared or other radio waves, or an externally connected device such as a mobile phone or a PDA (Personal Digital Assistant) that supports the operation of the vehicle control system 7000.
  • PDA Personal Digital Assistant
  • the input unit 7800 may be, for example, a camera, in which case the passenger can input information by gestures. Alternatively, data obtained by detecting the movement of a wearable device worn by the passenger may be input. Furthermore, the input unit 7800 may include, for example, an input control circuit that generates an input signal based on information input by a passenger or the like using the input unit 7800 and outputs the signal to the integrated control unit 7600. The passenger or the like operates the input unit 7800 to input various data to the vehicle control system 7000 and to instruct processing operations.
  • the memory unit 7690 may include a ROM (Read Only Memory) that stores various programs executed by the microcomputer, and a RAM (Random Access Memory) that stores various parameters, calculation results, sensor values, etc.
  • the memory unit 7690 may also be realized by a magnetic memory device such as a HDD (Hard Disc Drive), a semiconductor memory device, an optical memory device, or a magneto-optical memory device, etc.
  • the general-purpose communication I/F 7620 is a general-purpose communication I/F that mediates communication between various devices present in the external environment 7750.
  • the general-purpose communication I/F 7620 may implement cellular communication protocols such as GSM (registered trademark) (Global System of Mobile communications), WiMAX (registered trademark), LTE (registered trademark) (Long Term Evolution) or LTE-A (LTE-Advanced), or other wireless communication protocols such as wireless LAN (also called Wi-Fi (registered trademark)) and Bluetooth (registered trademark).
  • GSM Global System of Mobile communications
  • WiMAX registered trademark
  • LTE registered trademark
  • LTE-A Long Term Evolution
  • Bluetooth registered trademark
  • the general-purpose communication I/F 7620 may connect to devices (e.g., application servers or control servers) present on an external network (e.g., the Internet, a cloud network, or an operator-specific network) via, for example, a base station or an access point.
  • the general-purpose communication I/F 7620 may connect to a terminal located near the vehicle (e.g., a terminal of a driver, pedestrian, or store, or an MTC (Machine Type Communication) terminal), for example, using P2P (Peer To Peer) technology.
  • P2P Peer To Peer
  • the dedicated communication I/F 7630 is a communication I/F that supports communication protocols developed for use in vehicles.
  • the dedicated communication I/F 7630 may implement standard protocols such as WAVE (Wireless Access in Vehicle Environment), which is a combination of the lower layer IEEE 802.11p and the higher layer IEEE 1609, DSRC (Dedicated Short Range Communications), or a cellular communication protocol.
  • WAVE Wireless Access in Vehicle Environment
  • DSRC Dedicated Short Range Communications
  • the dedicated communication I/F 7630 typically performs V2X communication, a concept that includes one or more of vehicle-to-vehicle communication, vehicle-to-infrastructure communication, vehicle-to-home communication, and vehicle-to-pedestrian communication.
  • the positioning unit 7640 performs positioning by receiving, for example, GNSS signals from Global Navigation Satellite System (GNSS) satellites (for example, GPS signals from Global Positioning System (GPS) satellites), and generates position information including the latitude, longitude, and altitude of the vehicle.
  • GNSS Global Navigation Satellite System
  • GPS Global Positioning System
  • the positioning unit 7640 may determine the current position by exchanging signals with a wireless access point, or may obtain position information from a terminal such as a mobile phone, PHS, or smartphone that has a positioning function.
  • the beacon receiver 7650 receives, for example, radio waves or electromagnetic waves transmitted from radio stations installed on the road, and acquires information such as the current location, congestion, road closures, and travel time.
  • the functions of the beacon receiver 7650 may be included in the dedicated communication I/F 7630 described above.
  • the in-vehicle device I/F 7660 is a communication interface that mediates the connection between the microcomputer 7610 and various in-vehicle devices 7760 present in the vehicle.
  • the in-vehicle device I/F 7660 may establish a wireless connection using a wireless communication protocol such as wireless LAN, Bluetooth (registered trademark), NFC (Near Field Communication), or WUSB (Wireless USB).
  • the in-vehicle device I/F 7660 may also establish a wired connection such as USB (Universal Serial Bus), HDMI (registered trademark) (High-Definition Multimedia Interface), or MHL (Mobile High-definition Link) via a connection terminal (and a cable, if necessary) not shown.
  • USB Universal Serial Bus
  • HDMI registered trademark
  • MHL Mobile High-definition Link
  • the in-vehicle device 7760 may include, for example, at least one of a mobile device or wearable device owned by a passenger, or an information device brought into or installed in the vehicle.
  • the in-vehicle devices 7760 may also include a navigation device that searches for a route to an arbitrary destination.
  • the in-vehicle device I/F 7660 exchanges control signals or data signals with these in-vehicle devices 7760.
  • the in-vehicle network I/F 7680 is an interface that mediates communication between the microcomputer 7610 and the communication network 7010.
  • the in-vehicle network I/F 7680 transmits and receives signals in accordance with a specific protocol supported by the communication network 7010.
  • the microcomputer 7610 of the integrated control unit 7600 controls the vehicle control system 7000 according to various programs based on information acquired via at least one of the general-purpose communication I/F 7620, the dedicated communication I/F 7630, the positioning unit 7640, the beacon receiving unit 7650, the in-vehicle device I/F 7660, and the in-vehicle network I/F 7680.
  • the microcomputer 7610 may calculate control target values for the driving force generating device, the steering mechanism, or the braking device based on the acquired information inside and outside the vehicle, and output control commands to the drive system control unit 7100.
  • the microcomputer 7610 may perform cooperative control aimed at realizing the functions of an Advanced Driver Assistance System (ADAS), including vehicle collision avoidance or impact mitigation, following driving based on the distance between vehicles, vehicle speed maintenance driving, vehicle collision warning, vehicle lane departure warning, etc.
  • ADAS Advanced Driver Assistance System
  • the microcomputer 7610 may control the driving force generating device, steering mechanism, braking device, etc. based on the acquired information about the surroundings of the vehicle, thereby performing cooperative control for the purpose of automatic driving, which allows the vehicle to travel autonomously without relying on the driver's operation.
  • the microcomputer 7610 may generate three-dimensional distance information between the vehicle and objects such as surrounding structures and people based on information acquired via at least one of the general-purpose communication I/F 7620, the dedicated communication I/F 7630, the positioning unit 7640, the beacon receiving unit 7650, the in-vehicle equipment I/F 7660, and the in-vehicle network I/F 7680, and may create local map information including information about the surroundings of the vehicle's current position.
  • the microcomputer 7610 may also predict dangers such as vehicle collisions, the approach of pedestrians, or entry into closed roads based on the acquired information, and generate warning signals.
  • the warning signals may be, for example, signals for generating warning sounds or turning on warning lights.
  • the audio/image output unit 7670 transmits at least one of audio and image output signals to an output device capable of visually or audibly notifying the vehicle occupants or the outside of the vehicle of information.
  • an audio speaker 7710, a display unit 7720, and an instrument panel 7730 are illustrated as output devices.
  • the display unit 7720 may include, for example, at least one of an on-board display and a head-up display.
  • the display unit 7720 may have an AR (Augmented Reality) display function.
  • the output device may be other devices such as headphones, a wearable device such as a glasses-type display worn by the occupant, a projector, or a lamp, in addition to these devices.
  • the display device visually displays the results obtained by various processes performed by the microcomputer 7610 or information received from other control units in various formats such as text, images, tables, graphs, etc. Also, if the output device is an audio output device, the audio output device converts an audio signal consisting of reproduced voice data or acoustic data, etc., into an analog signal and outputs it audibly.
  • At least two control units connected via the communication network 7010 may be integrated into one control unit.
  • each control unit may be composed of multiple control units.
  • the vehicle control system 7000 may include another control unit not shown.
  • some or all of the functions performed by any of the control units may be provided by the other control units.
  • a predetermined calculation process may be performed by any of the control units.
  • a sensor or device connected to any of the control units may be connected to another control unit, and multiple control units may transmit and receive detection information to each other via the communication network 7010.
  • the zoom lens and imaging device of the present disclosure can be applied to the imaging unit 7410, and the imaging units 7910, 7912, 7914, 7916, and 7918.
  • the technology according to the present disclosure can be applied to a medical imaging system, which is a medical system that uses imaging technology, such as an endoscope system or a microscope system.
  • Fig. 47 is a diagram showing an example of a schematic configuration of an endoscope system 5000 to which the technology according to the present disclosure can be applied.
  • Fig. 48 is a diagram showing an example of a configuration of an endoscope 5001 and a CCU (Camera Control Unit) 5039.
  • Fig. 47 shows a state in which an operator (e.g., a doctor) 5067 who is a participant in the operation is performing an operation on a patient 5071 on a patient bed 5069 using the endoscope system 5000. As shown in Fig.
  • the endoscope system 5000 is composed of an endoscope 5001 which is a medical imaging device, a CCU 5039, a light source device 5043, a recording device 5053, an output device 5055, and a support device 5027 that supports the endoscope 5001.
  • an endoscope 5001 which is a medical imaging device, a CCU 5039, a light source device 5043, a recording device 5053, an output device 5055, and a support device 5027 that supports the endoscope 5001.
  • an insertion aid called a trocar 5025 is inserted into the patient 5071. Then, a scope 5003 and surgical tools 5021 connected to an endoscope 5001 are inserted into the body of the patient 5071 via the trocar 5025. Examples of the surgical tools 5021 include energy devices such as electric scalpels and forceps.
  • a surgical image which is a medical image showing the inside of the body of a patient 5071 captured by an endoscope 5001, is displayed on a display device 5041.
  • a surgeon 5067 performs treatment on the surgical subject using a surgical tool 5021 while viewing the surgical image displayed on the display device 5041.
  • the medical image is not limited to a surgical image, and may be a diagnostic image captured during a diagnosis.
  • the endoscope 5001 is an imaging unit that images the inside of the patient 5071, and is, for example, a camera 5005 including a focusing optical system 50051 that focuses incident light, a zoom optical system 50052 that changes the focal length of the imaging unit to enable optical zoom, a focus optical system 50053 that changes the focal length of the imaging unit to enable focus adjustment, and a light receiving element 50054, as shown in FIG. 48.
  • the endoscope 5001 generates a pixel signal by focusing light on the light receiving element 50054 via the connected scope 5003, and outputs the pixel signal to the CCU 5039 through a transmission system.
  • the scope 5003 has an objective lens at its tip and is an insertion part that guides light from the connected light source device 5043 into the body of the patient 5071.
  • the scope 5003 is, for example, a rigid scope in the case of a rigid endoscope, or a flexible scope in the case of a flexible endoscope.
  • the scope 5003 may be a direct endoscope or an oblique endoscope.
  • the pixel signal may be a signal based on a signal output from a pixel, for example, a RAW signal or an image signal.
  • a memory may be mounted on the transmission system connecting the endoscope 5001 and the CCU 5039, and parameters related to the endoscope 5001 and the CCU 5039 may be stored in the memory.
  • the memory may be disposed, for example, on a connection part or a cable of the transmission system.
  • the parameters at the time of shipment of the endoscope 5001 and the parameters changed when the power is applied may be stored in the memory of the transmission system, and the operation of the endoscope may be changed based on the parameters read from the memory.
  • the endoscope and the transmission system may be referred to as a set as an endoscope.
  • the light receiving element 50054 is a sensor that converts the received light into a pixel signal, and is, for example, a CMOS (Complementary Metal Oxide Semiconductor) type imaging element. It is preferable that the light receiving element 50054 is an imaging element capable of color photography having a Bayer array.
  • CMOS Complementary Metal Oxide Semiconductor
  • the light receiving element 50054 is preferably an imaging element having a number of pixels corresponding to a resolution of, for example, 4K (3840 horizontal pixels x 2160 vertical pixels), 8K (7680 horizontal pixels x 4320 vertical pixels), or square 4K (3840 or more horizontal pixels x 3840 or more vertical pixels).
  • the light receiving element 50054 may be one sensor chip or multiple sensor chips.
  • a prism may be provided to separate the incident light into predetermined wavelength bands, and each wavelength band may be imaged by a different light receiving element.
  • multiple light receiving elements may be provided for stereoscopic vision.
  • the light receiving element 50054 may be a sensor including an arithmetic processing circuit for image processing in a chip structure, or may be a ToF (Time of Flight) sensor.
  • the transmission system may be, for example, an optical fiber cable or wireless transmission.
  • the wireless transmission may be performed by any means as long as the pixel signal generated by the endoscope 5001 can be transmitted.
  • the endoscope 5001 and the CCU 5039 may be connected wirelessly, or the endoscope 5001 and the CCU 5039 may be connected via a base station in the operating room.
  • the endoscope 5001 may simultaneously transmit not only the pixel signal but also information related to the pixel signal (for example, the processing priority of the pixel signal, a synchronization signal, etc.).
  • the endoscope may be configured such that the scope and the camera are integrated, or a light receiving element is provided at the tip of the scope.
  • the CCU 5039 is a control device that comprehensively controls the connected endoscope 5001 and light source device 5043.
  • the CCU 5039 is an information storage device having an FPGA 50391, a CPU 50392, a RAM 50393, a ROM 50394, a GPU 50395, and an I/F 50396.
  • the CCU 5039 may also comprehensively control the connected display device 5041, recording device 5053, and output device 5055.
  • the CCU 5039 may control the irradiation timing, irradiation intensity, and irradiation
  • the CCU 5039 controls the type of light source.
  • the CCU 5039 performs image processing such as development processing (e.g., demosaic processing) and correction processing on the pixel signals output from the endoscope 5001, and transmits the processed images to an external device such as a display device 5041.
  • the resulting pixel signal (eg, an image) is output.
  • the CCU 5039 transmits a control signal to the endoscope 5001 to control the driving of the endoscope 5001.
  • the control signal is information on imaging conditions such as the magnification and focal length of the imaging unit, for example.
  • the CCU 5039 may have an image down-conversion function and be configured to be able to simultaneously output a high-resolution (e.g., 4K) image to the display device 5041 and a low-resolution (e.g., HD) image to the recording device 5053.
  • a high-resolution e.g., 4K
  • a low-resolution e.g., HD
  • the CCU 5039 may also be connected to an external device (e.g., a recording device, a display device, an output device, a support device) via an IP converter that converts signals into a specified communication protocol (e.g., IP (Internet Protocol)).
  • IP Internet Protocol
  • the connection between the IP converter and the external device may be configured as a wired network, or a part or all of the network may be constructed as a wireless network.
  • the IP converter on the CCU 5039 side may have a wireless communication function, and the received video may be transmitted to an IP switcher or an output side IP converter via a wireless communication network such as a fifth generation mobile communication system (5G) or a sixth generation mobile communication system (6G).
  • 5G fifth generation mobile communication system
  • 6G sixth generation mobile communication system
  • the light source device 5043 is a device capable of irradiating light in a predetermined wavelength band, and includes, for example, a plurality of light sources and a light source optical system that guides the light of the plurality of light sources.
  • the light sources are, for example, a xenon lamp, an LED light source, or an LD light source.
  • the light source device 5043 has, for example, LED light sources corresponding to each of the three primary colors R, G, and B, and emits white light by controlling the output intensity and output timing of each light source.
  • the light source device 5043 may have a light source capable of irradiating special light used in special light observation, in addition to a light source that irradiates normal light used in normal light observation.
  • the special light is light in a predetermined wavelength band different from normal light, which is light for normal light observation, and is, for example, near-infrared light (light with a wavelength of 760 nm or more), infrared light, blue light, or ultraviolet light.
  • the normal light is, for example, white light or green light.
  • narrowband light observation which is a type of special light observation, blue light and green light are alternately irradiated, and by utilizing the wavelength dependency of light absorption in body tissue, a predetermined tissue such as blood vessels on the surface of the mucous membrane can be photographed with high contrast.
  • a fluorescent observation is performed by irradiating a drug injected into a body tissue with excitation light that excites the drug, and receiving the fluorescence emitted by the drug, which is the body tissue or a marker, to obtain a fluorescent image, thereby making it easier for the surgeon to visually recognize the body tissue, which is difficult for the surgeon to visually recognize under normal light.
  • a drug such as indocyanine green (ICG) injected into the body tissue is irradiated with infrared light having an excitation wavelength band, and the fluorescence of the drug is received, thereby making it easier to visually recognize the structure of the body tissue and the affected area.
  • ICG indocyanine green
  • a drug e.g., 5-ALA
  • the type of irradiation light of the light source device 5043 is set under the control of the CCU 5039.
  • the CCU 5039 may have a mode in which normal light observation and special light observation are alternately performed by controlling the light source device 5043 and the endoscope 5001. At this time, it is preferable to superimpose information based on pixel signals obtained by special light observation on pixel signals obtained by normal light observation.
  • the special light observation may be infrared light observation in which infrared light is irradiated to view the inside of an organ from its surface, or multispectral observation using hyperspectral spectroscopy. Photodynamic therapy may also be combined.
  • the recording device 5053 is a device that records pixel signals (e.g., images) acquired from the CCU 5039, and is, for example, a recorder.
  • the recording device 5053 records images acquired from the CCU 5039 in a HDD, an SSD, or an optical disk.
  • the recording device 5053 may be connected to a network within the hospital and may be accessible from devices outside the operating room.
  • the recording device 5053 may also have an image down-conversion function or an image up-conversion function.
  • the display device 5041 is a device capable of displaying an image, such as a display monitor.
  • the display device 5041 displays an image based on a pixel signal acquired from the CCU 5039.
  • the display device 5041 may also function as an input device that enables gaze recognition, voice recognition, and instruction input by gestures by including a camera and a microphone.
  • the output device 5055 is a device, such as a printer, that outputs information acquired from the CCU 5039.
  • the output device 5055 prints, for example, a print image based on a pixel signal acquired from the CCU 5039 onto paper.
  • the support device 5027 is a multi-joint arm including a base 5029 having an arm control device 5045, an arm 5031 extending from the base 5029, and a holding part 5032 attached to the tip of the arm 5031.
  • the arm control device 5045 is configured by a processor such as a CPU, and controls the driving of the arm 5031 by operating according to a predetermined program.
  • the support device 5027 controls the position and posture of the endoscope 5001 held by the holding part 5032, for example, by controlling parameters such as the length of each link 5035 constituting the arm 5031 and the rotation angle and torque of each joint 5033 by the arm control device 5045.
  • the support device 5027 functions as an endoscope support arm that supports the endoscope 5001 during surgery. This allows the support device 5027 to take the place of a scopist, who is an assistant holding the endoscope 5001.
  • the support device 5027 may also be a device that supports a microscope device 5301, which will be described later, and may also be called a medical support arm.
  • the control of the support device 5027 may be an autonomous control method by the arm control device 5045, or a control method in which the arm control device 5045 controls the support device 5027 based on a user's input.
  • control method may be a master-slave method in which the support device 5027 as a slave device (replica device), which is a patient cart, is controlled based on the movement of a master device (primary device), which is an operator console at the user's hand.
  • the support device 5027 may also be remotely controlled from outside the operating room.
  • an example of an endoscope system 5000 to which the technology disclosed herein can be applied has been described.
  • the technology disclosed herein may be applied to a microscope system.
  • [Microscope system] 49 is a diagram showing an example of a schematic configuration of a microsurgery system to which the technology according to the present disclosure can be applied.
  • the same components as those in the endoscope system 5000 are denoted by the same reference numerals, and duplicated descriptions thereof will be omitted.
  • FIG. 49 shows a schematic diagram of an operator 5067 performing surgery on a patient 5071 on a patient bed 5069 using a microsurgery system 5300.
  • FIG. 49 omits the illustration of the cart 5037 from the configuration of the microsurgery system 5300, and shows a simplified illustration of a microscope device 5301 replacing the endoscope 5001.
  • the microscope device 5301 in this explanation may refer to the microscope unit 5303 provided at the tip of the link 5035, or may refer to the entire configuration including the microscope unit 5303 and the support device 5027.
  • a microsurgery system 5300 is used to display an image of the surgical site taken by a microscope device 5301 on a display device 5041 installed in an operating room in an enlarged manner.
  • the display device 5041 is installed in a position facing the surgeon 5067, who performs various procedures on the surgical site, such as resecting the affected area, while observing the state of the surgical site using the image displayed on the display device 5041.
  • Microsurgery systems are used, for example, in ophthalmic surgery and brain surgery.
  • the support device 5027 may support other observation devices or other surgical tools at its tip instead of the endoscope 5001 or the microscope unit 5303.
  • observation devices include forceps, a pneumoperitoneum tube for pneumoperitoneum, and an energy treatment tool for incising tissue or sealing blood vessels by cauterization.
  • the technology disclosed herein can be suitably applied to the camera 5005 of the configurations described above.
  • the zoom lens disclosed herein can be suitably applied to at least some of the optical systems of the focusing optical system 50051, the zoom optical system 50052, and the focus optical system 50053 in the camera 5005.
  • the configuration may include a number of lenses different from the number of lenses shown in the embodiment and example above.
  • the configuration may include a lens that has substantially no refractive power.
  • the present technology can be configured as follows.
  • the configuration of each lens group is optimized so that the zoom lens can suppress the angle of view change during focusing and can effectively correct various aberrations at a short minimum shooting distance while being small and lightweight. This makes it possible to provide a zoom lens that can suppress the angle of view change during focusing and can effectively correct various aberrations at a short minimum shooting distance while being small and lightweight, and an imaging device equipped with such a zoom lens.
  • a first lens group having negative refractive power From the object side to the image plane side, a first lens group having negative refractive power; An aperture diaphragm; A focus lens group; A floating lens group; a final lens group; During zooming, at least the focus lens group, the floating lens group, and the final lens group move along different trajectories, During focusing, the focus lens group and the floating lens group move along different trajectories, A zoom lens that satisfies the following condition: 0.50 ⁇
  • y be the lens diameter and x be the amount of sag of the aspheric surface.
  • the amount of sag at the position where the lens diameter y is the effective radius of the beam is defined as x n+1 .
  • [3] The zoom lens according to the above-mentioned [1] or [2], further comprising at least one lens group having positive refractive power between the first lens group and the focus lens group.
  • [4] The zoom lens according to any one of [1] to [3] above, further comprising a lens group that moves integrally with the final lens group during zooming, between the first lens group and the focus lens group.
  • [5] The zoom lens according to any one of [1] to [4] above, wherein at least one of the focus lens group and the floating lens group moves in opposite directions at a wide-angle end and a telephoto end during focusing.
  • zoom lens according to any one of the above [1] to [7], wherein the focus lens group has a positive refractive power, and the floating lens group has a negative refractive power.
  • a zoom lens and an image sensor that outputs an image signal corresponding to an optical image formed by the zoom lens;
  • the zoom lens comprises: From the object side to the image plane side, a first lens group having negative refractive power; An aperture stop; A focus lens group; A floating lens group; a final lens group; During zooming, at least the focus lens group, the floating lens group, and the final lens group move along different trajectories, During focusing, the focus lens group and the floating lens group move along different trajectories, An imaging device that satisfies the following conditional expression.
  • f1 focal length of the first lens group
  • fFmax focal length of the lens group having the larger absolute focal length value among the focus lens group and the floating lens group
  • fF1 focal length of the focus lens group
  • fF2 focal length of the floating lens group.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Lenses (AREA)
PCT/JP2023/040022 2022-12-20 2023-11-07 ズームレンズ、および撮像装置 WO2024135126A1 (ja)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007086307A (ja) * 2005-09-21 2007-04-05 Olympus Imaging Corp ズーム光学系及びそれを備えた撮像装置
JP2014102462A (ja) * 2012-11-22 2014-06-05 Canon Inc ズームレンズ及びそれを有する撮像装置
JP2021167973A (ja) * 2017-11-20 2021-10-21 株式会社ニコン 変倍光学系、光学装置、および変倍光学系の製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007086307A (ja) * 2005-09-21 2007-04-05 Olympus Imaging Corp ズーム光学系及びそれを備えた撮像装置
JP2014102462A (ja) * 2012-11-22 2014-06-05 Canon Inc ズームレンズ及びそれを有する撮像装置
JP2021167973A (ja) * 2017-11-20 2021-10-21 株式会社ニコン 変倍光学系、光学装置、および変倍光学系の製造方法

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