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WO2018189818A1 - Système de lentille, dispositif de capture d'image, corps mobile et système - Google Patents

Système de lentille, dispositif de capture d'image, corps mobile et système Download PDF

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Publication number
WO2018189818A1
WO2018189818A1 PCT/JP2017/014881 JP2017014881W WO2018189818A1 WO 2018189818 A1 WO2018189818 A1 WO 2018189818A1 JP 2017014881 W JP2017014881 W JP 2017014881W WO 2018189818 A1 WO2018189818 A1 WO 2018189818A1
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WIPO (PCT)
Prior art keywords
lens
lens group
negative
lens system
object side
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2017/014881
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English (en)
Japanese (ja)
Inventor
滋彦 松永
永華 陳
元太郎 入澤
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SZ DJI Technology Co Ltd
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SZ DJI Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Priority to PCT/JP2017/014881 priority Critical patent/WO2018189818A1/fr
Priority to JP2017559467A priority patent/JP6524548B2/ja
Publication of WO2018189818A1 publication Critical patent/WO2018189818A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G02B13/04—Reversed telephoto objectives
    • 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

Definitions

  • the present invention relates to a lens system, an imaging device, a moving body, and a system.
  • Patent Document 1 JP 2012-18422 A
  • Patent Document 2 JP 2015-22142 JP
  • Patent Document 3 JP 2015-43108 A
  • a compact lens system with a wide half angle of view is desired.
  • a lens system includes, in order from the object side, a first lens group, an aperture stop, and a second lens group having a positive refractive power.
  • the first lens group may include, in order from the object side, a 1a lens group having negative refractive power, a reflecting member that bends the optical path, and a 1b lens group having positive refractive power.
  • the first-a lens group includes three negative lenses, a meniscus first negative lens having a convex surface facing the object side, a second negative lens having a concave surface facing the image side, and a third negative lens in order from the object side.
  • the single lens may be included.
  • the 1b lens group may include at least one positive lens.
  • the second lens group may include four or more lenses including at least one cemented lens.
  • At least one of the second negative lens and the third negative lens may have an aspheric shape.
  • An imaging apparatus includes the above lens system and an imaging element.
  • a moving body according to one embodiment of the present invention moves with the lens system described above.
  • the moving body may be an unmanned aerial vehicle.
  • a system according to an aspect of the present invention includes the above-described lens system and a support mechanism that supports the lens system in a displaceable manner.
  • a lens system having a high resolution, a small size and a wide half angle of view is desired.
  • FIG. 1 schematically illustrates an example of a mobile system 10 that includes an unmanned aerial vehicle (UAV) 100 and a controller 50.
  • UAV unmanned aerial vehicle
  • FIG. 1 schematically illustrates an example of a mobile system 10 that includes an unmanned aerial vehicle (UAV) 100 and a controller 50.
  • UAV unmanned aerial vehicle
  • FIG. 1 schematically illustrates an example of a mobile system 10 that includes an unmanned aerial vehicle (UAV) 100 and a controller 50.
  • UAV100 unmanned aerial vehicle
  • the lens configuration of the lens system 300 in the first example is shown together with the filter F and the image sensor 221.
  • the spherical aberration and astigmatism of the lens system 300 are shown.
  • the lens configuration of the lens system 400 in the second embodiment is shown together with the filter F and the image sensor 221. 2 shows the spherical aberration and astigmatism of the lens system 400.
  • the lens configuration of the lens system 500 in the third embodiment is shown together with the filter F and the image sensor 221. The
  • the lens configuration of the lens system 600 in the fourth embodiment is shown together with the filter F and the image sensor 221.
  • 2 shows spherical aberration and astigmatism of the lens system 600.
  • 2 is an external perspective view showing an example of a stabilizer 3000.
  • FIG. 1 schematically shows an example of a mobile system 10 including an unmanned aerial vehicle (UAV) 100 and a controller 50.
  • the UAV 100 includes a UAV main body 101, a gimbal 110, a plurality of imaging devices 230, and an imaging device 220.
  • the imaging device 220 includes a lens device 160 and an imaging unit 140.
  • the UAV 100 is an example of a moving body that includes an imaging device and moves.
  • the moving body is a concept including, in addition to UAV, other aircraft that moves in the air, vehicles that move on the ground, ships that move on the water, and the like.
  • the UAV main body 101 includes a plurality of rotor blades.
  • the UAV main body 101 flies the UAV 100 by controlling the rotation of a plurality of rotor blades.
  • the UAV main body 101 causes the UAV 100 to fly using four rotary wings.
  • the number of rotor blades is not limited to four.
  • the UAV 100 may be a fixed wing aircraft that does not have rotating blades.
  • the imaging device 230 is an imaging camera that images a subject included in a desired imaging range.
  • the plurality of imaging devices 230 are sensing cameras that image the surroundings of the UAV 100 in order to control the flight of the UAV 100.
  • the imaging device 230 may be fixed to the UAV main body 101.
  • Two imaging devices 230 may be provided on the front surface which is the nose of the UAV 100.
  • Two other imaging devices 230 may be provided on the bottom surface of the UAV 100.
  • the two imaging devices 230 on the front side may be paired and function as a so-called stereo camera.
  • the two imaging devices 230 on the bottom side may also be paired and function as a stereo camera.
  • Three-dimensional spatial data around the UAV 100 may be generated based on images captured by the plurality of imaging devices 230.
  • the distance to the subject imaged by the plurality of imaging devices 230 can be specified by a stereo camera by the plurality of imaging devices 230.
  • the number of imaging devices 230 provided in the UAV 100 is not limited to four.
  • the UAV 100 only needs to include at least one imaging device 230.
  • the UAV 100 may include at least one imaging device 230 on each of the nose, the tail, the side surface, the bottom surface, and the ceiling surface of the UAV 100.
  • the imaging device 230 may have a single focus lens or a fisheye lens.
  • the plurality of imaging devices 230 may be collectively referred to simply as the imaging device 230.
  • the controller 50 includes a display unit 54 and an operation unit 52.
  • the operation unit 52 receives an input operation for controlling the attitude of the UAV 100 from the user.
  • the controller 50 transmits a signal for controlling the UAV 100 based on a user operation received by the operation unit 52.
  • the operation unit 52 receives an operation for instructing the focus position of the lens device 160.
  • the controller 50 transmits a signal for instructing the change of the focus position to the UAV 100.
  • the controller 50 receives an image captured by at least one of the imaging device 230 and the imaging device 220.
  • the display unit 54 displays an image received by the controller 50.
  • the display unit 54 may be a touch panel.
  • the controller 50 may accept an input operation from the user through the display unit 54.
  • the display unit 54 may accept a user operation or the like in which the user specifies the position of the subject to be imaged by the imaging device 220.
  • the imaging unit 140 generates and records image data of an optical image formed by the lens device 160.
  • the lens device 160 may be provided integrally with the imaging unit 140.
  • the lens device 160 may be a so-called interchangeable lens.
  • the lens device 160 may be provided so as to be detachable from the imaging unit 140.
  • the gimbal 110 has a support mechanism that movably supports the imaging device 220.
  • the imaging device 220 is attached to the UAV main body 101 via the gimbal 110.
  • the gimbal 110 supports the imaging device 220 so as to be rotatable about the pitch axis.
  • the gimbal 110 supports the imaging device 220 so as to be rotatable around a roll axis.
  • the gimbal 110 supports the imaging device 220 so as to be rotatable about the yaw axis.
  • the gimbal 110 may support the imaging device 220 rotatably around at least one of a pitch axis, a roll axis, and a yaw axis.
  • the gimbal 110 may support the imaging device 220 rotatably about each of the pitch axis, the roll axis, and the yaw axis.
  • the gimbal 110 may hold the imaging unit 140.
  • the gimbal 110 may hold the lens device 160.
  • the gimbal 110 may change the imaging direction of the imaging device 220 by rotating the imaging unit 140 and the lens device 160 about at least one of the yaw axis, the pitch axis, and the roll axis.
  • FIG. 2 shows an example of functional blocks of the UAV100.
  • the UAV 100 includes an interface 102, a control unit 104, a memory 106, a gimbal 110, an imaging unit 140, and a lens device 160.
  • the interface 102 communicates with the controller 50.
  • the interface 102 receives various commands from the controller 50.
  • the control unit 104 controls the flight of the UAV 100 according to the command received from the controller 50.
  • the control unit 104 controls the gimbal 110, the imaging unit 140, and the lens device 160.
  • the control unit 104 may be configured by a microprocessor such as a CPU or MPU, a microcontroller such as an MCU, or the like.
  • the memory 106 stores a program necessary for the control unit 104 to control the gimbal 110, the imaging unit 140, and the lens device 160.
  • the memory 106 may be a computer-readable recording medium.
  • the memory 106 may include at least one of flash memory such as SRAM, DRAM, EPROM, EEPROM, and USB memory.
  • the memory 106 may be provided in the housing of the UAV 100. It may be provided so as to be removable from the housing of the UAV 100.
  • the gimbal 110 includes a control unit 112, a driver 114, a driver 116, a driver 118, a drive unit 124, a drive unit 126, a drive unit 128, and a support mechanism 130.
  • the drive unit 124, the drive unit 126, and the drive unit 128 may be motors.
  • the support mechanism 130 supports the imaging device 220.
  • the support mechanism 130 movably supports the imaging direction of the imaging device 220.
  • the support mechanism 130 supports the imaging unit 140 and the lens device 160 so as to be rotatable about the yaw axis, the pitch axis, and the roll axis.
  • the support mechanism 130 includes a rotation mechanism 134, a rotation mechanism 136, and a rotation mechanism 138.
  • the rotation mechanism 134 rotates the imaging unit 140 and the lens device 160 around the yaw axis using the drive unit 124.
  • the rotation mechanism 136 rotates the imaging unit 140 and the lens device 160 around the pitch axis using the driving unit 126.
  • the rotation mechanism 138 uses the drive unit 128 to rotate the imaging unit 140 and the lens device 160 around the roll axis.
  • the control unit 112 outputs an operation command indicating each rotation angle to the driver 114, the driver 116, and the driver 118 according to the operation command of the gimbal 110 from the control unit 104.
  • the driver 114, the driver 116, and the driver 118 drive the drive unit 124, the drive unit 126, and the drive unit 128 in accordance with an operation command that indicates a rotation angle.
  • the rotation mechanism 134, the rotation mechanism 136, and the rotation mechanism 138 are driven and rotated by the drive unit 124, the drive unit 126, and the drive unit 128, respectively, and change the postures of the imaging unit 140 and the lens device 160.
  • the imaging unit 140 captures an image with light that has passed through the lens system 300.
  • the imaging unit 140 includes a control unit 222, an imaging element 221, and a memory 223.
  • the control unit 222 may be configured by a microprocessor such as a CPU or MPU, a microcontroller such as an MCU, or the like.
  • the control unit 222 controls the imaging unit 140 and the lens device 160 in accordance with an operation command for the imaging unit 140 and the lens device 160 from the control unit 104. Based on the signal received from the controller 50, the controller 222 outputs to the lens device 160 a control command that instructs the lens device 160 to move the focus position.
  • the memory 223 may be a computer-readable recording medium, and may include at least one of flash memory such as SRAM, DRAM, EPROM, EEPROM, and USB memory.
  • the memory 223 may be provided inside the housing of the imaging unit 140. It may be provided so as to be removable from the housing of the imaging unit 140.
  • the imaging element 221 generates image data of an optical image that is held inside the housing of the imaging unit 140 and is formed via the lens device 160, and outputs the image data to the control unit 222.
  • the control unit 222 stores the image data output from the image sensor 221 in the memory 223.
  • the control unit 222 may output the image data to the memory 106 via the control unit 104 and store it.
  • the lens device 160 is a single focus lens.
  • the lens device 160 may be a full length fixed lens.
  • the lens device 160 includes a control unit 162, a memory 163, a drive mechanism 161, and a lens system 300.
  • the lens system 300 includes a first lens group 301, an aperture stop S, and a second lens group 302 in order from the object side to the image side.
  • the optical axis of the lens system 300 may be simply referred to as “optical axis”.
  • the first lens group 301 includes an optical member that bends incident light. Thereby, the lens system 300 can be reduced in size.
  • the “lens group” means a group of one or more lenses.
  • a lens composed of a single lens is also called a “lens group”.
  • the control unit 162 adjusts the focus by displacing the focus lens included in the lens system 300 along the optical axis in accordance with a control command from the control unit 222.
  • An image formed by the lens system 300 of the lens device 160 is captured by the imaging unit 140.
  • the driving mechanism 161 displaces the focus lens included in the lens system 300.
  • the drive mechanism 161 includes, for example, an actuator and a holding member that holds the focus lens. Driving pulses are supplied from the control unit 162 to the actuator.
  • the actuator is displaced by a driving amount corresponding to the supplied pulse.
  • the holding member is displaced according to the displacement of the actuator, the focus lens is displaced. Thereby, focus adjustment is performed.
  • the enlarged shooting is performed by so-called electronic zoom. For example, enlarged shooting is performed by cutting out a part of an image captured by the image sensor 221.
  • the lens device 160 may be provided integrally with the imaging unit 140.
  • the lens device 160 may be a so-called interchangeable lens.
  • the lens device 160 may be provided so as to be detachable from the imaging unit 140.
  • the imaging device 230 includes a control unit 232, a control unit 234, an imaging device 231, a memory 233, and a lens 235.
  • the control unit 232 may be configured by a microprocessor such as a CPU or MPU, a microcontroller such as an MCU, or the like.
  • the control unit 232 controls the image sensor 231 in accordance with an operation command for the image sensor 231 from the control unit 104.
  • the control unit 234 may be configured by a microprocessor such as a CPU or MPU, a microcontroller such as an MCU, or the like.
  • the control unit 234 may control the focal point of the lens 235 in accordance with an operation command for the lens 235.
  • the control unit 234 may control the aperture stop included in the lens 235 in accordance with an operation command for the lens 235.
  • the memory 233 may be a computer-readable recording medium.
  • the memory 233 may include at least one of flash memory such as SRAM, DRAM, EPROM, EEPROM, and USB memory.
  • the image sensor 231 generates image data of an optical image formed through the lens 235 and outputs the image data to the control unit 232.
  • the control unit 232 stores the image data output from the image sensor 231 in the memory 233.
  • the UAV 100 includes the control unit 104, the control unit 112, the control unit 222, the control unit 232, the control unit 234, and the control unit 162
  • any one of the control units 104, the control unit 112, the control unit 222, the control unit 232, the control unit 234, and the process executed by a plurality of the control units 162 may be executed by any one control unit.
  • Processing executed by the control unit 104, the control unit 112, the control unit 222, the control unit 232, the control unit 234, and the control unit 162 may be executed by one control unit.
  • the UAV 100 includes the memory 106, the memory 223, and the memory 233 will be described.
  • Information stored in at least one of the memory 106, the memory 223, and the memory 233 may be stored in one or more other memories of the memory 106, the memory 223, and the memory 233.
  • FIG. 3 shows the lens configuration of the lens system 300 in the first embodiment, together with the filter F and the image sensor 221.
  • the lens system 300 includes, in order from the object side, a first lens group 301, an aperture stop S, and a second lens group 302 having a positive refractive power.
  • An optical filter F is provided on the object side of the image sensor 221. Light that has passed through the lens system 300 and the filter F is incident on the image sensor 221.
  • the lens system 300 has a two-group configuration.
  • “Ln” indicates a lens.
  • n following L is an integer of 1 or more.
  • n indicates the nth lens from the object side.
  • Ln is a symbol assigned to indicate the nth lens from the object side. It does not mean that the lens to which the symbol Ln is assigned in the description of each embodiment and the lenses in other embodiments to which the same symbol Ln is assigned are the same lens.
  • the first lens group 301 has a positive refractive power.
  • the first lens group 301 includes a first-a lens group 311, a reflecting member Pr, and a first-b lens group 312 in order from the object side.
  • the 1a lens group 311 has a negative refractive power.
  • the 1b lens group 312 has positive refractive power.
  • the reflecting member Pr bends the optical path.
  • the reflecting member Pr reflects the light incident from the 1a lens group 311 side and emits it to the 1b lens group 312 side.
  • the first-a lens group 311 includes three negative single lenses of a first negative lens L1, a second negative lens L2, and a third negative lens L3 in order from the object side.
  • the first negative lens L1 has a meniscus shape with a convex surface facing the object side.
  • the second negative lens L2 has a concave surface on the image side.
  • the third negative lens L3 has a concave surface on the image side.
  • the 1b lens group 312 includes at least one positive lens.
  • the second lens group 302 includes four or more lenses including at least one cemented lens. In the first example, the second lens group 302 includes five lenses including one cemented lens.
  • Conditional expression 1 is satisfied, where f is the focal length of the entire system and f11 is the focal length of the 1a lens group. ⁇ 1.8 ⁇ f11 / f ⁇ 1.25 (Condition 1)
  • the first negative lens L1, the second negative lens L2, and the third negative lens L3 included in the 1a lens group 311 are each a single lens.
  • the negative refractive power of the 1a lens group 311 can be increased. Therefore, the lens system 300 can be reduced in size. Further, by sharing the negative refractive power by the three pieces, it is possible to suppress the occurrence of off-axis aberrations.
  • first b lens group 312 includes at least one positive lens and the second lens group 302 includes at least one lens including at least one cemented lens, so that axial chromatic aberration and lateral chromatic aberration are effective. Can be corrected automatically.
  • conditional expression 1 If the upper limit of conditional expression 1 is exceeded, the refractive power of the first-a lens group 311 will become strong and it will be difficult to correct off-axis aberrations. If the lower limit of conditional expression 1 is not reached, the refractive power becomes weak and the lens system 300 becomes large.
  • Conditional Expression 1 it is possible to achieve downsizing and high resolution. According to such a lens system 300, it is possible to provide a lens system having a high resolving power, a small size, and a wide half angle of view.
  • conditional expressions 2 to 5 are satisfied, where the Abbe number with respect to the d line is vi.
  • N1 is less than or equal to the lower limit of Conditional Expression 1, or N2 is less than or equal to the lower limit of Conditional Expression 2
  • the negative refractive power of the first negative lens L1 or the second negative lens L2 is reduced in order to reduce the size. It needs to be strong. If the radius of curvature of the lens is reduced in order to increase the negative refractive power, off-axis aberrations increase and aberration correction becomes difficult.
  • v1 is less than or equal to the lower limit of Conditional Expression 4 or v5 is less than or equal to the lower limit of Conditional Expression 5, lateral chromatic aberration increases, making it difficult to correct chromatic aberration with a subsequent lens.
  • conditional expression 6 is satisfied. 3.6 ⁇ f2 / f ⁇ 5.6 (Condition 6)
  • conditional expression 6 The more the upper limit of conditional expression 6 is reached, the weaker the refractive power of the second lens group. Therefore, it is necessary to enlarge the second lens group 302, which leads to an increase in the size of the lens system 300. If the lower limit of conditional expression 6 is not reached, the refractive power of the second lens group 302 becomes too strong, and aberration correction becomes difficult. By satisfying conditional expression 6, the lens system 300 can be miniaturized and easily corrected for aberrations in a balanced manner.
  • conditional expression 7 is satisfied, where R12 is the radius of curvature of the image side surface of the first negative lens L1 included in the first lens group 311 and f_1 is the focal length of the first negative lens. 0.45 ⁇ R12 /
  • Conditional expression 7 defines the refractive power of the image side surface of the first negative lens L1.
  • the refractive power of the image side surface of the first negative lens L1 becomes too weak, and the lens system 300 becomes large. If the lower limit of conditional expression 7 is not reached, the refractive power of the image side surface of the first negative lens L1 becomes too strong and off-axis aberrations become large. Further, since the lens shape of the first negative lens L1 approaches a hemisphere, it is difficult to manufacture the first negative lens L1.
  • conditional expression 8 When the refractive index of the reflecting member Pr with respect to the d-line is Npr, it is preferable that the conditional expression 8 is satisfied. Npr> 1.8 (conditional expression 8)
  • Conditional expression 8 defines the refractive index at the d-line of the reflecting member Pr. If the lower limit of conditional expression 8 is not reached, the first lens group 301 will be enlarged, and it will be difficult to reduce the size of the lens system 300. By satisfying the conditional expression, the optical path can be shortened.
  • At least one of the second negative lens L2 and the third negative lens L3 included in the first-a lens group 311 has an aspherical shape.
  • the third negative lens L3 has an aspheric shape.
  • the heights of the on-axis rays and the off-axis rays are set.
  • the difference increases.
  • the first negative lens L1, the second negative lens L2, and the third negative lens L3 at least one of the two negative lenses L2 and L3 located on the image side is an aspherical surface.
  • the cost can be reduced as compared with the case where the first lens on the object side having the largest effective diameter is an aspherical surface.
  • the UAV 100 may include two or more imaging devices having the same configuration as the imaging device 220 including the lens system 300, and may use two or more imaging devices as an omnidirectional camera.
  • the third negative lens L3 is a biconcave lens having an aspheric shape on both sides.
  • the reflecting member Pr is a prism that bends the optical path by 90 °.
  • An optical member other than the prism may be applied as the reflecting member.
  • the second lens group 302 includes a cemented lens of a biconvex lens L4 and a biconcave lens L5, a cemented lens of a biconvex lens L8 and a biconcave lens L9, and a biconvex lens L10 having aspherical aspheric surfaces on both surfaces.
  • Each lens is composed of a glass lens.
  • the linear expansion coefficient can be reduced by about an order of magnitude compared to the case where a plastic lens is used. Therefore, it is possible to suppress changes in optical characteristics when the temperature changes.
  • a plurality of surfaces of the lens system are identified by a surface number i, where i is a natural number.
  • the first surface of the lens as viewed from the object side is the first surface, and thereafter the surface numbers are counted up in the order in which the light passes through the surface.
  • STO in the surface number represents the aperture surface of the aperture stop S.
  • Di indicates an interval on the optical axis between the i-th surface and the (i + 1) -th surface.
  • F indicates the focal length.
  • Fno indicates an F number.
  • R indicates a radius of curvature. In the radius of curvature, “INF” indicates a plane.
  • N represents a refractive index.
  • Table 1 shows lens data of lenses included in the lens system 300.
  • Di, n, and v are shown in association with the surface number i.
  • a surface numbered with * is a surface having an aspherical shape.
  • Table 2 shows the surface number of the surface having the aspheric shape and the aspheric parameter.
  • ⁇ represents a conic constant (conic constant).
  • A”, “B”, “C”, and “D” are fourth-order, sixth-order, eighth-order, and tenth-order aspheric coefficients, respectively.
  • Ei represents an exponential expression with 10 as the base in the aspheric coefficient. That is, “ Ei ” represents “10 ⁇ i ”. For example, “ ⁇ 1.93744E-03” represents “ ⁇ 1.93744 ⁇ 10 ⁇ 3 ”.
  • the paraxial curvature is the reciprocal of the radius of curvature.
  • Table 3 shows the focal length, F number, and half angle of view of the lens system 300.
  • FIG. 4 shows the spherical aberration and astigmatism of the lens system 300.
  • the solid line indicates the d-line (587.56 nm)
  • the broken line indicates the g-line (435.84 nm)
  • the alternate long and short dash line indicates the c-line (656.27 nm).
  • the solid line indicates the value of the sagittal image plane of the d line
  • the broken line indicates the value of the meridional image plane of the d line. From the respective aberration diagrams, it is apparent that the lens system 300 in the first example has excellent imaging performance with various aberrations corrected well.
  • FIG. 5 shows the lens configuration of the lens system 400 in the second embodiment together with the filter F and the image sensor 221.
  • the lens system 400 includes a first lens group 401, an aperture stop S, and a second lens group 402 in order from the object side.
  • An optical filter F is provided on the object side of the image sensor 221.
  • the first lens group 401 and the second lens group 402 correspond to the first lens group 301 and the second lens group 302 in the lens system 300, respectively.
  • the first lens group 401 has a positive refractive power.
  • the first lens group 401 includes a first-a lens group 411, a reflecting member Pr, and a first-b lens group 412 in order from the object side.
  • the first-a lens group 411 includes a negative meniscus lens L1 having a convex surface on the object side, a negative meniscus lens L2 having a convex surface on the object side, and a biconcave lens L3 having an aspheric shape on both surfaces.
  • the 1b lens group 412 includes a cemented lens of a biconvex lens L4 and a biconcave lens L5.
  • the reflecting member Pr is a prism that bends the optical path by 90 ° and has the same configuration as the reflecting member Pr in the lens system 300.
  • An optical member other than the prism may be applied as the reflecting member.
  • the reflecting member Pr is abbreviated as a square, and the optical axes before and after the reflecting member Pr are in the same direction on the paper surface. It is shown aligned.
  • the lens configurations of the subsequent examples are similarly expressed.
  • the second lens group 402 includes a positive lens L6 having an aspheric surface on both sides, a cemented lens of a biconvex lens L7 and a biconcave lens L8, and a positive lens L9 having an aspheric shape on both sides.
  • Each lens is composed of a glass lens.
  • the linear expansion coefficient can be reduced by about an order of magnitude compared to the case of using a plastic lens. Therefore, it is possible to suppress changes in optical characteristics when the temperature changes.
  • Table 4 shows lens data of lenses included in the lens system 400.
  • Di, n, and v are shown in association with the surface number i.
  • the surface numbered with * is a surface having an aspherical shape.
  • Table 5 shows the surface number of the surface having the aspheric shape and the aspheric parameter.
  • “ ⁇ ” represents a conic constant (conic constant).
  • “A”, “B”, “C”, and “D” are fourth-order, sixth-order, eighth-order, and tenth-order aspheric coefficients, respectively.
  • “Ei” represents an exponential expression with 10 as the base in the aspheric coefficient. That is, “ Ei ” represents “10 ⁇ i ”.
  • “ ⁇ 8.58326E-04” represents “ ⁇ 8.58326 ⁇ 10 ⁇ 4 ”.
  • Table 6 shows the focal length, F-number, and half angle of view of the lens system 400.
  • FIG. 6 shows the spherical aberration and astigmatism of the lens system 400.
  • the solid line indicates the d-line (587.56 nm)
  • the broken line indicates the g-line (435.84 nm)
  • the alternate long and short dash line indicates the c-line (656.27 nm).
  • the solid line indicates the value of the sagittal image plane of the d line
  • the broken line indicates the value of the meridional image plane of the d line. From each aberration diagram, it is clear that the lens system 400 has excellent imaging performance with various aberrations corrected well.
  • FIG. 7 shows a lens configuration of the lens system 500 in the third embodiment together with the filter F and the image sensor 221.
  • the lens system 500 includes a first lens group 501, an aperture stop S, and a second lens group 502 in order from the object side.
  • An optical filter F is provided on the object side of the image sensor 221.
  • the first lens group 501 and the second lens group 502 correspond to the first lens group 301 and the second lens group 302 in the lens system 300, respectively.
  • the first lens group 501 has a positive refractive power.
  • the first lens group 501 includes a 1a lens group 511, a reflecting member Pr, and a 1b lens group 512 in order from the object side.
  • the first-a lens group 511 includes a negative meniscus lens L1 having a convex surface on the object side, a negative meniscus lens L2 having a convex surface on the object side, and a biconcave lens L3 having an aspheric shape on both surfaces.
  • the 1b lens group 512 includes a cemented lens of a biconvex lens L4 and a negative meniscus lens L5.
  • the reflecting member Pr is a prism that bends the optical path by 90 °.
  • the second lens group 502 includes a positive lens L6 having an aspheric surface on both sides, a cemented lens of a biconvex lens L7 and a biconcave lens L8, and a biconvex lens L9 having an aspheric shape on both sides.
  • Each lens is composed of a glass lens.
  • the linear expansion coefficient can be reduced by about an order of magnitude compared to the case of using a plastic lens. Therefore, it is possible to suppress changes in optical characteristics when the temperature changes.
  • Table 7 shows lens data of lenses included in the lens system 500.
  • Di, n, and v are shown in association with the surface number i.
  • the surface numbered with * is a surface having an aspherical shape.
  • Table 8 shows the surface number of the surface having the aspheric shape and the aspheric parameter.
  • ⁇ represents a conic constant (conic constant).
  • A”, “B”, “C”, and “D” are fourth-order, sixth-order, eighth-order, and tenth-order aspheric coefficients, respectively.
  • Ei represents an exponential expression with 10 as the base in the aspheric coefficient. That is, “ Ei ” represents “10 ⁇ i ”. For example, “ ⁇ 6.39797E-04” represents “ ⁇ 6.39797 ⁇ 10 ⁇ 4 ”.
  • Table 9 shows the focal length, F-number, and half angle of view of the lens system 500.
  • FIG. 8 shows the spherical aberration and astigmatism of the lens system 500.
  • the solid line indicates the d-line (587.56 nm)
  • the broken line indicates the g-line (435.84 nm)
  • the alternate long and short dash line indicates the c-line (656.27 nm).
  • the solid line indicates the value of the sagittal image plane of the d line
  • the broken line indicates the value of the meridional image plane of the d line. From each aberration diagram, it is clear that the lens system 500 has excellent imaging performance with various aberrations corrected well.
  • FIG. 9 shows the lens configuration of the lens system 600 in the fourth embodiment together with the filter F and the image sensor 221.
  • the lens system 600 includes a first lens group 601, an aperture stop S, and a second lens group 602 in order from the object side.
  • An optical filter F is provided on the object side of the image sensor 221.
  • the first lens group 601 and the second lens group 602 correspond to the first lens group 301 and the second lens group 302 in the lens system 300, respectively.
  • the first lens group 601 has a positive refractive power.
  • the first lens group 601 includes a 1a lens group 611, a reflecting member Pr, and a 1b lens group 612 in order from the object side.
  • the first-a lens group 611 includes a negative meniscus lens L1 having a convex surface on the object side, a negative meniscus lens L2 having a convex surface on the object side, and a negative lens L3.
  • the 1b lens group 612 includes a cemented lens of a biconvex lens L4 and a biconcave lens L5.
  • the reflecting member Pr is a prism that bends the optical path by 90 °. An optical member other than the prism may be applied as the reflecting member.
  • the second lens group 602 includes a positive lens L6 having an aspheric surface on both sides, a cemented lens of a biconvex lens L7 and a biconcave lens L8, and a biconvex lens L9 having an aspheric shape on both sides.
  • Each lens is composed of a glass lens.
  • the linear expansion coefficient can be reduced by about an order of magnitude compared to the case of using a plastic lens. Therefore, it is possible to suppress changes in optical characteristics when the temperature changes.
  • Table 10 shows lens data of lenses included in the lens system 600.
  • Di, n, and v are shown in association with the surface number i.
  • a surface numbered with * is a surface having an aspherical shape.
  • Table 11 shows the surface number of the surface having the aspheric shape and the aspheric parameter.
  • ⁇ represents a conic constant (conic constant).
  • A”, “B”, “C”, and “D” are fourth-order, sixth-order, eighth-order, and tenth-order aspheric coefficients, respectively.
  • Ei represents an exponential expression with 10 as the base in the aspheric coefficient. That is, “ Ei ” represents “10 ⁇ i ”. For example, “2.889955E-04” represents “2.889955 ⁇ 10 ⁇ 4 ”.
  • Table 12 shows the focal length, F-number, and half angle of view of the lens system 600.
  • FIG. 10 shows the spherical aberration and astigmatism of the lens system 600.
  • the solid line indicates the d-line (587.56 nm)
  • the broken line indicates the g-line (435.84 nm)
  • the alternate long and short dash line indicates the c-line (656.27 nm).
  • the solid line indicates the value of the sagittal image plane of the d line
  • the broken line indicates the value of the meridional image plane of the d line. From each aberration diagram, it is apparent that the lens system 600 has excellent imaging performance with various aberrations corrected well.
  • Table 13 shows numerical values relating to the conditional expressions in the first to sixth embodiments.
  • Table 14 shows focal lengths according to Conditional Expression 1, Conditional Expression 6 and Conditional Expression 7 in the first to sixth embodiments.
  • the lens system described above it is possible to provide a lens system having a high resolving power, a small size and a wide half angle of view.
  • FIG. 11 is an external perspective view showing an example of the stabilizer 3000.
  • the stabilizer 3000 is another example of the moving body.
  • the camera unit 3013 included in the stabilizer 3000 may include an imaging device having the same configuration as that of the imaging device 220.
  • the camera unit 3013 may include a lens device having the same configuration as the lens device 160.
  • the stabilizer 3000 includes a camera unit 3013, a gimbal 3020, and a handle portion 3003.
  • the gimbal 3020 supports the camera unit 3013 in a rotatable manner.
  • the gimbal 3020 has a pan axis 3009, a roll axis 3010, and a tilt axis 3011.
  • the gimbal 3020 supports the camera unit 3013 so as to be rotatable about a pan axis 3009, a roll axis 3010, and a tilt axis 3011.
  • the gimbal 3020 is an example of a support mechanism.
  • the camera unit 3013 is an example of an imaging device.
  • the camera unit 3013 has a slot 3014 for inserting a memory.
  • the gimbal 3020 is fixed to the handle portion 3003 via the holder 3007.
  • the handle 3003 has various buttons for operating the gimbal 3020 and the camera unit 3013.
  • the handle portion 3003 includes a shutter button 3004, a recording button 3005, and an operation button 3006. By pressing the shutter button 3004, a still image can be recorded by the camera unit 3013.
  • the recording button 3005 is pressed, a moving image can be recorded by the camera unit 3013.
  • the device holder 3001 is fixed to the handle 3003.
  • the device holder 3001 holds a mobile device 3002 such as a smartphone.
  • the mobile device 3002 is communicably connected to the stabilizer 3000 via a wireless network such as WiFi. Thereby, an image captured by the camera unit 3013 can be displayed on the screen of the mobile device 3002.
  • the camera unit 3013 includes a lens system having the same configuration as the lens system included in the lens device 160, whereby an image with a wide angle of view and high resolution can be obtained.
  • the camera unit 3013 can be downsized.
  • the UAV 100 and the stabilizer 3000 are taken up as an example of the moving body.
  • An imaging device having the same configuration as that of the imaging device 220 may be attached to a moving body other than the UAV 100 and the stabilizer 3000.
  • the imaging device attached to the moving body has been described.
  • the imaging device having the same configuration as that of the imaging device 220 is not limited to the imaging device attached to the moving body.
  • a configuration similar to that of the imaging device 220 can be applied to a non-lens interchangeable camera such as a so-called compact digital camera.
  • the same configuration as the lens device 160 can be applied to an interchangeable lens of a lens interchangeable camera such as a single-lens reflex camera.
  • a configuration similar to that of the lens device 160 can be applied to a video camera or the like.
  • the same configuration as the lens device 160 can be applied to the configurations of various lens devices for imaging.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

Ce système de lentilles est pourvu, dans l'ordre suivant du côté de l'objet, d'un premier groupe de lentilles, d'un diaphragme d'ouverture et d'un second groupe de lentilles ayant un pouvoir réfringent positif. Le premier groupe de lentilles peut avoir, dans l'ordre suivant du côté de l'objet, un premier groupe de lentilles ayant une réfringence négative, un élément réfléchissant qui courbe un chemin optique et un premier groupe de lentilles ayant une réfringence positive. Le premier groupe de lentilles (a) peut comprendre trois lentilles simples négatives, à savoir une première lentille négative de ménisque ayant une surface convexe du côté objet, une seconde lentille négative présentant une surface concave du côté image et une troisième lentille négative, dite trois lentilles simples négatives sont disposées dans cet ordre du côté de l'objet. Le premier groupe de lentilles (b) peut comprendre au moins une lentille positive. Le second groupe de lentilles peut être pourvu de quatre lentilles ou plus comprenant au moins une lentille collée. Lorsque la distance de point focal de l'ensemble du système de lentille est représentée par f, et la distance de point focal du premier (a) groupe de lentilles est représentée par f11, l'expression conditionnelle de -1.8 < f11/f < -1.25 peut être satisfaite.
PCT/JP2017/014881 2017-04-11 2017-04-11 Système de lentille, dispositif de capture d'image, corps mobile et système Ceased WO2018189818A1 (fr)

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JP2017559467A JP6524548B2 (ja) 2017-04-11 2017-04-11 レンズ系、撮像装置、移動体及びシステム

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CN113960752A (zh) * 2021-10-13 2022-01-21 江西凤凰光学科技有限公司 一种小畸变高分辨率鱼眼镜头
CN114424105A (zh) * 2019-09-30 2022-04-29 株式会社尼康 光学系统、光学设备及光学系统的制造方法
JP2022117772A (ja) * 2021-02-01 2022-08-12 株式会社リコー 単焦点レンズ、交換レンズ及び撮像装置
JPWO2023127560A1 (fr) * 2021-12-28 2023-07-06
WO2024142829A1 (fr) * 2022-12-26 2024-07-04 株式会社ニコン Système optique, dispositif optique, et procédé de fabrication de système optique

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CN109725406A (zh) * 2019-02-21 2019-05-07 浙江舜宇光学有限公司 光学镜头
CN109725406B (zh) * 2019-02-21 2024-04-02 浙江舜宇光学有限公司 光学镜头
CN114424105A (zh) * 2019-09-30 2022-04-29 株式会社尼康 光学系统、光学设备及光学系统的制造方法
JP2022117772A (ja) * 2021-02-01 2022-08-12 株式会社リコー 単焦点レンズ、交換レンズ及び撮像装置
JP7697216B2 (ja) 2021-02-01 2025-06-24 株式会社リコー 単焦点レンズ、交換レンズ及び撮像装置
CN113960752A (zh) * 2021-10-13 2022-01-21 江西凤凰光学科技有限公司 一种小畸变高分辨率鱼眼镜头
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WO2023127560A1 (fr) * 2021-12-28 2023-07-06 株式会社ニコン Système optique, appareil optique et procédé de fabrication de système optique
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WO2024142829A1 (fr) * 2022-12-26 2024-07-04 株式会社ニコン Système optique, dispositif optique, et procédé de fabrication de système optique
JPWO2024142829A1 (fr) * 2022-12-26 2024-07-04

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