WO2024010090A1 - Système optique, dispositif optique et procédé de fabrication d'un système optique - Google Patents

Système optique, dispositif optique et procédé de fabrication d'un système optique Download PDF

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Publication number
WO2024010090A1
WO2024010090A1 PCT/JP2023/025321 JP2023025321W WO2024010090A1 WO 2024010090 A1 WO2024010090 A1 WO 2024010090A1 JP 2023025321 W JP2023025321 W JP 2023025321W WO 2024010090 A1 WO2024010090 A1 WO 2024010090A1
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optical system
lens group
conditional expression
lens
focal length
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PCT/JP2023/025321
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English (en)
Japanese (ja)
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孝道 倉茂
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株式会社ニコン
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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
    • G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
    • 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 disclosure relates to an optical system, an optical device, and a method for manufacturing an optical system.
  • the optical system of the present disclosure includes, in order from the object side, a front lens group, a prism having a branching surface that transmits part of the incident light and reflects at least another part different from the part of the incident light; a first optical system having a first rear lens group into which light having a longer optical path length when passing through a prism enters among the transmitted light and the reflected light; and a front lens in order from the object side. a second optical system having a prism, and a second rear lens group into which light having a shorter optical path length when passing through the prism among the transmitted light and the reflected light is incident. and satisfy the following conditional expressions.
  • f(gr1n) Synthetic focal length of the negative lens disposed closest to the object side among the negative lenses included in the front lens group and the negative lens disposed continuously on the image plane side
  • f(L) First optical system focal length of
  • the method for manufacturing an optical system of the present disclosure includes, in order from the object side, a front lens group and a branching surface that transmits a part of the incident light and reflects at least another part of the incident light that is different from the part of the incident light.
  • a first optical system having a prism, and a first rear lens group into which light having a longer optical path length when passing through the prism among transmitted light and reflected light enters;
  • a second optical system including, in order, a front lens group, a prism, and a second rear lens group into which light having a shorter optical path length when passing through the prism among transmitted light and reflected light is incident;
  • a method of manufacturing an optical system including a lens group and a prism, in which each lens group and prism are arranged so as to satisfy the following conditional expression.
  • f(gr1n) Synthetic focal length of the negative lens disposed closest to the object side among the negative lenses included in the front lens group and the negative lens disposed continuously on the image plane side
  • f(L) First optical system focal length of
  • FIG. 2 is a schematic diagram illustrating a schematic configuration of an optical system of a first example.
  • FIG. 3 is a cross-sectional view of the first optical system included in the optical system of the first embodiment.
  • FIG. 3 is a diagram showing various aberrations of the first optical system included in the optical system of the first example.
  • FIG. 3 is a sectional view of a second optical system included in the optical system of the first embodiment.
  • FIG. 7 is a diagram showing various aberrations of the second optical system included in the optical system of the first embodiment.
  • FIG. 7 is a cross-sectional view of the first optical system included in the optical system of the second embodiment.
  • FIG. 7 is a diagram showing various aberrations of the first optical system included in the optical system of the second example.
  • FIG. 7 is a cross-sectional view of a second optical system included in the optical system of the second embodiment.
  • FIG. 7 is a diagram showing various aberrations of the second optical system included in the optical system of the second example.
  • FIG. 7 is a cross-sectional view of the first optical system included in the optical system of the third embodiment.
  • FIG. 7 is a diagram showing various aberrations of the first optical system included in the optical system of the third example.
  • FIG. 7 is a cross-sectional view of a second optical system included in the optical system of the third embodiment.
  • FIG. 7 is a diagram showing various aberrations of the second optical system included in the optical system of the third example.
  • FIG. 1 is a schematic diagram of an optical device equipped with an optical system of this embodiment. 1 is a flowchart illustrating an outline of a method for manufacturing an optical system according to the present embodiment.
  • the optical system of this embodiment includes, in order from the object side, a front lens group, and a prism having a branching surface that transmits a part of the incident light and reflects at least another part that is different from the part of the incident light. , a first rear lens group into which the light having the longer optical path length when passing through the prism among the transmitted light and the reflected light is incident; a second optical system having a lens group, a prism, and a second rear lens group into which light having a shorter optical path length when passing through the prism among the transmitted light and the reflected light enters; and satisfies the following conditional expression.
  • f(gr1n) Synthetic focal length of the negative lens disposed closest to the object side among the negative lenses included in the front lens group and the negative lens disposed continuously on the image plane side
  • f(L) First optical system focal length of
  • the entire optical system can be downsized by using the front lens group in the first optical system and the second optical system.
  • Conditional expression (1) is the composite focal length of the negative lens placed closest to the object side among the negative lenses included in the front lens group, and the negative lens placed successively on the image plane side, and of the first optical system. Define the ratio to the focal length.
  • the optical system of this embodiment suppresses an increase in the lens diameter of the lens closest to the object, and appropriately reduces various aberrations such as field curvature, astigmatism, and distortion. Can be corrected.
  • conditional expression (1) when the value of conditional expression (1) exceeds the upper limit, the lens diameter of the lens closest to the object becomes too large, and various aberrations such as field curvature, astigmatism, and distortion are corrected. becomes difficult.
  • the effects of this embodiment can be made more reliable. Further, in order to further ensure the effects of this embodiment, it is preferable to set the upper limit of conditional expression (1) to 3.80, 3.35, and further 2.90.
  • the optical total length is the length obtained by adding the back focus in air equivalent length to the distance on the optical axis from the lens surface closest to the object side to the lens surface closest to the image plane side.
  • T (pL) Length of the prism on the optical axis in the first optical system
  • T (pS) Length of the prism on the optical axis in the second optical system
  • Conditional expression (2) defines the ratio of the length of the prism on the optical axis in the first optical system to the length on the optical axis of the prism in the second optical system.
  • conditional expression (2) if the value of conditional expression (2) exceeds the upper limit, it becomes difficult to correct various aberrations such as spherical aberration and coma aberration.
  • conditional expression (2) if the value of conditional expression (2) is below the lower limit, it becomes difficult to correct various aberrations such as spherical aberration and coma aberration. Furthermore, the peripheral light flux of the first optical system is restricted, and the amount of peripheral light is reduced.
  • Conditional expression (3) is the composite focal length of the negative lens placed closest to the object side among the negative lenses included in the front lens group and the negative lens placed successively on the image plane side, and the second optical system. This defines the ratio to the focal length.
  • the optical system of this embodiment suppresses an increase in the lens diameter of the lens closest to the object, and appropriately reduces various aberrations such as field curvature, astigmatism, and distortion. Can be corrected.
  • conditional expression (3) if the value of conditional expression (3) exceeds the upper limit, the lens diameter of the lens closest to the object becomes too large, and various aberrations such as field curvature, astigmatism, and distortion are corrected. becomes difficult.
  • the effects of this embodiment can be made more reliable. Further, in order to further ensure the effects of this embodiment, it is preferable to set the upper limit of conditional expression (3) to 4.00, 3.70, and further 3.40.
  • conditional expression (3) if the value of conditional expression (3) is below the lower limit, it becomes difficult to correct various aberrations such as field curvature, astigmatism, and distortion.
  • TL(L) Optical total length of the first optical system
  • TL(S) Optical total length of the second optical system
  • Conditional expression (4) defines the ratio of the total optical length of the first optical system to the total optical length of the second optical system.
  • conditional expression (4) exceeds the upper limit in the optical system of this embodiment, the total optical length of the first optical system becomes too large, and it becomes difficult to correct various aberrations such as spherical aberration and coma aberration.
  • the effects of this embodiment can be made more reliable. Further, in order to further ensure the effects of this embodiment, it is preferable to set the upper limit of conditional expression (4) to 2.80, 2.20, and further 1.60.
  • conditional expression (4) if the value of conditional expression (4) is below the lower limit, the total optical length of the second optical system becomes too large, and it becomes difficult to correct various aberrations such as spherical aberration and coma aberration. .
  • f(gr1p) Synthetic focal length of the positive lens placed closest to the object side among the positive lenses included in the front lens group and the positive lens placed successively on the image plane side.
  • Conditional expression (5) is the composite focal length of the negative lens that is placed in succession from the negative lens that is placed closest to the object side to the image plane side among the negative lenses that are included in the front lens group, and the negative lens that is included in the front lens group. This defines the ratio of the positive lens placed closest to the object side to the composite focal length of the positive lenses placed successively on the image plane side.
  • conditional expression (5) when the value of conditional expression (5) exceeds the upper limit, the angle of incidence on the branching surface becomes too large, making it difficult to manufacture a branching surface with a predetermined performance.
  • conditional expression (5) falls below the lower limit, the refractive power of the front lens group becomes weak, the lens diameter of the lens closest to the object becomes too large, and the field curvature occurs. , it becomes difficult to correct various aberrations such as distortion.
  • the second rear lens group has an aperture stop and satisfies the following conditional expression. (6) 0.50 ⁇ f(gr2S)/(-f(gr1)) ⁇ 3.40 however, f(gr2S): Composite focal length of the lens closer to the image plane than the aperture stop in the second rear lens group f(gr1): Composite focal length of the front lens group
  • Conditional expression (6) defines the ratio between the composite focal length of the lens on the image plane side of the aperture stop in the second rear lens group and the composite focal length of the front lens group.
  • conditional expression (6) if the value of conditional expression (6) exceeds the upper limit, the refractive power of the lens on the image plane side of the aperture stop in the second optical system becomes weaker, and the total optical length becomes too large. It becomes difficult to correct various aberrations such as field curvature, coma aberration, and distortion aberration.
  • the effects of this embodiment can be made more reliable. Further, in order to further ensure the effects of this embodiment, it is preferable to set the upper limit of conditional expression (6) to 3.10, 2.80, and further 2.50.
  • conditional expression (6) falls below the lower limit, the refractive power of the front lens group becomes weak, the lens diameter of the lens closest to the object becomes too large, and the second optical It becomes difficult to correct various aberrations such as field curvature and distortion in the system.
  • the first rear lens group has an aperture stop and satisfies the following conditional expression. (7) 0.40 ⁇ f(gr2L)/(-f(gr1)) ⁇ 4.20 however, f(gr2L): Composite focal length of the lens closer to the image plane than the aperture stop in the first rear lens group f(gr1): Composite focal length of the front lens group
  • Conditional expression (7) defines the ratio of the composite focal length of the lenses closer to the image plane than the aperture stop in the first rear lens group and the composite focal length of the front lens group.
  • conditional expression (7) if the value of conditional expression (7) exceeds the upper limit, the refractive power of the lens on the image plane side of the aperture stop in the first optical system becomes weaker, and the total optical length becomes too large. It becomes difficult to correct various aberrations such as field curvature, coma aberration, and distortion aberration.
  • the effects of this embodiment can be made more reliable. Further, in order to further ensure the effects of this embodiment, it is preferable to set the upper limit of conditional expression (7) to 3.80, 3.50, and further 3.20.
  • conditional expression (7) falls below the lower limit, the refractive power of the front lens group becomes weak, the lens diameter of the lens closest to the object becomes too large, and the first optical It becomes difficult to correct various aberrations such as field curvature and distortion in the system.
  • Conditional expression (8) is based on the focal length of the lens closest to the image plane in the second rear lens group, and the focal length of the negative lens included in the front lens group that is located closest to the object side to the image plane side. This defines the ratio of the negative lens to the composite focal length of the negative lens arranged as follows.
  • the optical system of this embodiment suppresses an increase in the lens diameter of the lens closest to the object, suppresses an increase in the total optical length in the second optical system, and suppresses field curvature.
  • Various aberrations such as , coma, and distortion can be appropriately corrected.
  • conditional expression (8) if the value of conditional expression (8) falls below the upper limit, the refractive power of the lens closest to the image plane in the second optical system becomes weak, the total optical length becomes too large, and field curvature occurs. It becomes difficult to correct various aberrations such as , coma, and distortion.
  • the effects of this embodiment can be made more reliable. Further, in order to further ensure the effects of this embodiment, it is preferable to set the upper limit of conditional expression (8) to 5.30, 4.80, and further 4.20.
  • conditional expression (8) if the value of conditional expression (8) falls below the lower limit, the refractive power of the front lens group becomes weak, the lens diameter of the lens closest to the object side becomes too large, and the second optical system It becomes difficult to correct various aberrations such as field curvature and distortion.
  • Conditional expression (9) is based on the focal length of the lens closest to the image plane in the first rear lens group, and the focal length of the lens that is located closest to the object side among the negative lenses included in the front lens group. This defines the ratio of the negative lens to the composite focal length of the negative lens arranged as follows.
  • the optical system of this embodiment suppresses an increase in the lens diameter of the lens closest to the object side, suppresses an increase in the total optical length in the first optical system, and suppresses field curvature.
  • Various aberrations such as , coma, and distortion can be appropriately corrected.
  • conditional expression (9) if the value of conditional expression (9) is less than the upper limit, the refractive power of the lens closest to the image plane in the first optical system becomes weak, the total optical length becomes too large, and field curvature occurs. It becomes difficult to correct various aberrations such as , coma, and distortion.
  • the effects of this embodiment can be made more reliable. Furthermore, in order to ensure the effects of this embodiment, it is preferable to set the upper limit of conditional expression (9) to 6.30, 5.00, and further 3.90.
  • conditional expression (9) falls below the lower limit, the refractive power of the front lens group becomes weak, the lens diameter of the lens closest to the object becomes too large, and the first optical system It becomes difficult to correct various aberrations such as field curvature and distortion.
  • the second rear lens group has an aperture stop and satisfies the following conditional expression. (10) 1.60 ⁇ f(gr2S)/f(S) ⁇ 5.60 however, f(gr2S): Combined focal length of the lens closer to the image plane than the aperture stop in the second rear lens group f(S): Focal length of the second optical system
  • Conditional expression (10) defines the ratio between the composite focal length of the lens on the image plane side of the aperture stop in the second rear lens group and the focal length of the second optical system.
  • conditional expression (10) the optical system of this embodiment suppresses an increase in the total optical length in the second optical system, and appropriately corrects various aberrations such as spherical aberration, coma aberration, and curvature of field. be able to.
  • conditional expression (10) falls below the upper limit, the refractive power of the lens on the image plane side of the aperture stop in the second optical system becomes weaker, and the total optical length becomes too large. It becomes difficult to correct various aberrations such as spherical aberration, coma aberration, and curvature of field.
  • the effects of this embodiment can be made more reliable. Further, in order to further ensure the effects of this embodiment, it is preferable to set the upper limit of conditional expression (10) to 5.00, 4.50, and further 3.90.
  • conditional expression (10) when the value of conditional expression (10) is less than the lower limit value, the refractive power of the lens on the image plane side is stronger than the aperture stop in the second optical system, and spherical aberration and It becomes difficult to correct various aberrations such as coma aberration and curvature of field.
  • the first rear lens group has an aperture stop and satisfies the following conditional expression. (11) 2.30 ⁇ f(gr2L)/f(L) ⁇ 8.80 however, f(gr2L): Composite focal length of the lens closer to the image plane than the aperture stop in the first rear lens group f(L): Focal length of the first optical system
  • Conditional expression (11) defines the ratio of the combined focal length of the lens closer to the image plane than the aperture stop in the first rear lens group and the focal length of the first optical system.
  • conditional expression (11) falls below the upper limit, the refractive power of the lens on the image plane side of the aperture stop in the first optical system becomes weaker, and the total optical length becomes too large. It becomes difficult to correct various aberrations such as spherical aberration, coma aberration, and curvature of field.
  • conditional expression (11) when the value of conditional expression (11) is less than the lower limit value, the refractive power of the lens on the image plane side is stronger than the aperture stop in the first optical system, and spherical aberration and It becomes difficult to correct various aberrations such as coma aberration and curvature of field.
  • Conditional expression (12) defines the ratio between the length of the prism on the optical axis in the second optical system and the focal length of the second optical system.
  • the optical system of the present embodiment appropriately corrects various aberrations such as spherical aberration, coma aberration, and curvature of field while suppressing an increase in the total optical length in the second optical system. can do.
  • conditional expression (12) if the value of conditional expression (12) is less than the upper limit, the total optical length becomes too large in the second optical system, and various aberrations such as spherical aberration, coma aberration, and curvature of field cannot be corrected. It becomes difficult.
  • the effects of this embodiment can be made more reliable. Furthermore, in order to ensure the effects of this embodiment, it is preferable to set the upper limit of conditional expression (12) to 5.70, 5.00, and even 4.40.
  • conditional expression (12) in the optical system of this embodiment falls below the lower limit, it becomes difficult to correct various aberrations such as spherical aberration, coma aberration, and field curvature in the second optical system.
  • Conditional expression (13) defines the ratio between the length of the prism on the optical axis in the first optical system and the focal length of the second optical system.
  • conditional expression (13) if the value of conditional expression (13) is less than the upper limit, the total optical length in the first optical system becomes too large and correction of various aberrations such as spherical aberration, coma aberration, and curvature of field becomes difficult. It becomes difficult.
  • the effects of this embodiment can be made more reliable. Furthermore, in order to ensure the effects of this embodiment, it is preferable to set the upper limit of conditional expression (13) to 19.00, 17.50, and further 16.50.
  • conditional expression (13) in the optical system of this embodiment falls below the lower limit, it becomes difficult to correct various aberrations such as spherical aberration, coma aberration, and field curvature in the first optical system.
  • Conditional expression (14) defines the ratio of the distance on the optical axis from the lens surface closest to the object side of the front lens group to the lens surface closest to the image plane of the front lens group and the focal length of the second optical system. It is something to do.
  • conditional expression (14) the optical system of this embodiment suppresses an increase in the total optical length while appropriately correcting various aberrations such as spherical aberration, coma aberration, and curvature of field. can do.
  • conditional expression (14) if the value of conditional expression (14) is less than the upper limit, the total optical length becomes too large in the second optical system, and correction of various aberrations such as spherical aberration, coma aberration, and curvature of field becomes difficult. It becomes difficult.
  • conditional expression (14) in the optical system of this embodiment falls below the lower limit, it becomes difficult to correct various aberrations such as spherical aberration, coma aberration, and field curvature in the second optical system.
  • Conditional expression (15) defines the ratio of the distance on the optical axis from the lens surface closest to the object side of the front lens group to the lens surface closest to the image plane of the front lens group and the focal length of the first optical system. It is something to do.
  • the optical system of this embodiment suppresses an increase in the total optical length while appropriately correcting various aberrations such as spherical aberration, coma aberration, and curvature of field. can do.
  • conditional expression (15) if the value of conditional expression (15) is less than the upper limit, the total optical length in the first optical system becomes too large and correction of various aberrations such as spherical aberration, coma aberration, and curvature of field becomes difficult. It becomes difficult.
  • conditional expression (15) in the optical system of this embodiment falls below the lower limit, it becomes difficult to correct various aberrations such as spherical aberration, coma aberration, and field curvature in the first optical system.
  • Conditional expression (16) defines the average refractive index for the s-line of the negative lens included in the front lens group.
  • the optical system of this embodiment can appropriately correct various aberrations such as distortion and field curvature by satisfying conditional expression (16).
  • conditional expression (16) falls below the upper limit, the refractive power for the s-line of the negative lens included in the front lens group becomes too strong, resulting in various aberrations such as distortion and curvature of field. It becomes difficult to correct.
  • conditional expression (16) if the value of conditional expression (16) is below the lower limit, the refractive power for the s-line of the negative lens included in the front lens group becomes too weak, resulting in various aberrations such as distortion and curvature of field. It becomes difficult to correct.
  • Conditional expression (17) defines the ratio of the focal length of the lens closest to the image plane in the second rear lens group to the focal length of the lens closest to the image plane in the first rear lens group. .
  • the optical system of this embodiment can reduce the deviation of the imaging position on the image plane with respect to a predetermined angle of view in the first optical system and the second optical system.
  • conditional expression (17) falls below the upper limit, it becomes difficult to correct the distortion aberration of the first optical system and the second optical system so that their respective distortion aberrations approach each other.
  • the deviation of the imaging position on the image plane with respect to a predetermined angle of view in the system becomes large.
  • the effects of this embodiment can be made more reliable. Further, in order to ensure the effects of this embodiment, it is preferable to set the upper limit of conditional expression (17) to 1.40, 1.30, and further 1.20.
  • conditional expression (17) falls below the lower limit, it becomes difficult to correct the distortion aberration of the first optical system and the second optical system so that their respective distortion aberrations become close to each other.
  • the deviation of the imaging position on the image plane with respect to a predetermined angle of view in the system becomes large.
  • the front lens group has negative refractive power.
  • the front lens group each have one or more positive lenses and one or more negative lenses.
  • the optical system of this embodiment can appropriately correct various aberrations such as field curvature and astigmatism.
  • Conditional expression (24) defines the entire angle of view of the first optical system.
  • the optical system of this embodiment can obtain an image representing a wide range by the first optical system by satisfying conditional expression (24).
  • conditional expression (24) if the value of conditional expression (24) is below the lower limit, it is not possible to obtain an image representing a wide range with the first optical system.
  • Conditional expression (25) defines the entire angle of view of the second optical system.
  • the optical system of this embodiment can obtain an image representing a wider range by the second optical system by satisfying conditional expression (25).
  • conditional expression (25) if the value of conditional expression (25) is below the lower limit, it is not possible to obtain an image representing a wide range with the second optical system.
  • one of the transmitted light and the reflected light is visible light and the other is near-infrared light
  • the optical system that uses visible light from the branching surface to the image plane side has a cemented lens
  • the optical system that uses near-infrared light from the branching surface to the image plane side consists of only a single lens.
  • the optical system that uses visible light from the branching surface to the image plane side has a cemented lens, so that chromatic aberration can be appropriately corrected.
  • the optical system that uses near-infrared light from the branching surface to the image plane side is configured with only a single lens, so that the optical system can be miniaturized.
  • the prism preferably includes a total reflection surface that totally reflects at least light on the optical axis among the light reflected by the branching surface after passing through the front lens group.
  • the optical system of this embodiment can reduce the angle of incidence of the incident light on the branching surface, and can reduce the difficulty in manufacturing a branching surface having a predetermined performance. .
  • the optical device of this embodiment has an optical system configured as described above. As a result, it is possible to realize an optical device that can appropriately form images of the incident light transmitted by the branching surface and the light reflected by the branching surface, and perform processing using each image. can.
  • the method for manufacturing an optical system of the present disclosure includes, in order from the object side, a front lens group and a branching surface that transmits a part of incident light and reflects at least another part different from the part of the incident light.
  • a first optical system having a prism and a first rear lens group into which light having a longer optical path length when passing through the prism among transmitted light and reflected light enters;
  • a second optical system having a front lens group, the prism, and a second rear lens group into which light having a shorter optical path length when passing through the prism is incident among the transmitted light and the reflected light.
  • a method of manufacturing an optical system including a lens group and a prism, in which each lens group and prism are arranged so as to satisfy the following conditional expression.
  • f(gr1n) Synthetic focal length of the negative lens disposed closest to the object side among the negative lenses included in the front lens group and the negative lens disposed continuously on the image plane side
  • f(L) First optical system focal length of
  • FIG. 1 is a schematic diagram illustrating the schematic configuration of the optical system of the first embodiment.
  • the optical system 1 of this embodiment includes, in order from the object side, a front lens group GR1, a prism P having a branching surface BF, and light that enters the front lens group GR1 and the prism P and is transmitted by the branching surface BF. It has a first optical system OS1 including a first rear lens group GR2L.
  • the optical system 1 of this embodiment includes, in order from the object side, a front lens group GR1, a prism P, a second rear lens group into which light enters the front lens group GR1 and the prism P and is reflected by the branching surface BF. It has a second optical system OS2 including a side lens group GR2S.
  • the light that enters the first rear lens group GR2L is the light that has a longer optical path length when passing through the prism P between the light that is transmitted by the branching surface BF and the light that is reflected.
  • the light that enters the second rear lens group GR2S is the light that has a shorter optical path length when passing through the prism P between the light that is transmitted by the branching surface BF and the light that is reflected.
  • the first optical axis X1 of the first optical system OS1 and the second optical axis X2 of the second optical system OS2 are shown on the object side with respect to the branch plane BF so as not to overlap each other for the sake of explanation. .
  • the prism P is a dichroic prism having a branching surface BF that transmits visible light and reflects near-infrared light.
  • Visible light includes, for example, d-line (wavelength: 587.6 nm) or g-line (wavelength: 435.8 nm), and near-infrared light includes, for example, s-line (wavelength: 852.1 nm).
  • the first optical system OS1 of this embodiment images the light (near infrared light) emitted from the front lens group GR1 and reflected by the branching surface BF and the total reflection surface TRF of the prism P onto the image plane I1.
  • the second optical system OS2 of this embodiment images the light (visible light) emitted from the front lens group GR1 and transmitted through the branching surface BF of the prism P onto the image plane I2.
  • the optical system 1 of this embodiment appropriately controls the light reflected by the branching surface BF and the light transmitted by the branching surface BF out of the incident light by the first optical system OS1 and the second optical system OS2, respectively. It can be imaged.
  • FIG. 2 is a cross-sectional view of the first optical system OS1 included in the optical system 1 of the first embodiment.
  • the first optical system OS1 of this embodiment includes, in order from the object side, a meniscus-shaped negative lens L1 with a convex surface facing the object side, a biconcave negative lens L2, and a meniscus-shaped negative lens L2 with a concave surface facing the object side.
  • L13, and a biconvex positive lens L14 is a biconvex positive lens L14.
  • An image sensor composed of a CCD, CMOS, or the like is arranged on the image plane I1.
  • a filter FL1 is arranged between the positive lens L14, which is arranged closest to the image plane I1, and the image plane I1.
  • the negative lens L1, the negative lens L2, and the positive lens L3 are included in the front lens group GR1. Further, the positive lens L11, the aperture stop ST1, the positive lens L12, the negative lens L13, and the positive lens L14 are included in the first rear lens group GR2L.
  • Table 1-1 below lists the values of the specifications of the first optical system OS1 of this example.
  • m is the order of the optical surfaces counted from the object side
  • r is the radius of curvature
  • d is the surface spacing
  • n(d) is the refractive index for the d-line
  • n(s) is The refractive index for the s-line and ⁇ d indicate the Abbe number for the d-line.
  • optical surfaces marked with "*" indicate that they are aspheric surfaces.
  • m is the optical surface corresponding to the aspheric data
  • K is the conic constant
  • A4 to A10 are the aspheric coefficients.
  • the height of the aspherical surface in the direction perpendicular to the optical axis is y, and the distance (sag amount) along the optical axis from the tangent plane of the vertex of each aspherical surface to each aspherical surface at the height y is S(y)
  • the radius of curvature (paraxial radius of curvature) of the reference sphere is r
  • the conic constant is K
  • the nth-order aspherical coefficient is An
  • the units of focal length f, radius of curvature r, and other lengths listed in Table 1-1 are "mm".
  • the optical system is not limited to this because the same optical performance can be obtained even if the optical system is proportionally enlarged or reduced.
  • FIG. 3 is a diagram showing various aberrations of the first optical system OS1 included in the optical system 1 of the first embodiment.
  • the spherical aberration diagram shows the ratio to the maximum aperture
  • the astigmatism diagram shows the value of the half angle of view
  • the coma aberration diagram shows the ratio to the maximum image height.
  • Each aberration diagram shows s-line values.
  • S indicates a sagittal image plane
  • T indicates a meridional image plane.
  • the first optical system OS1 of this example appropriately corrects various aberrations and has high optical performance for s-line.
  • FIG. 4 is a cross-sectional view of the second optical system OS2 included in the optical system 1 of the first embodiment.
  • the second optical system OS2 of this embodiment includes, in order from the object side, a meniscus-shaped negative lens L1 with a convex surface facing the object side, a biconcave negative lens L2, and a meniscus-shaped negative lens L2 with a concave surface facing the object side.
  • It has a cemented negative lens L23 and a biconcave negative lens L24, a meniscus-shaped positive lens L25 with a convex surface facing the object side, and a meniscus-shaped positive lens L26 with a convex surface facing the object side. .
  • An image sensor composed of a CCD, CMOS, etc. is arranged on the image plane I2.
  • a filter FL2 is disposed between the positive lens L26, which is disposed closest to the image plane I2, and the image plane I2.
  • the negative lens L1, the negative lens L2, and the positive lens L3 are included in the front lens group GR1. Further, the positive lens L21, the aperture stop ST2, the positive lens L22, the cemented negative lens of the positive lens L23 and the negative lens L24, the positive lens L25, and the positive lens L26 are included in the second rear lens group GR2S. included.
  • Table 1-2 lists the values of the specifications of the second optical system OS2 of this example.
  • FIG. 5 is a diagram showing various aberrations of the second optical system OS2 included in the optical system 1 of the first embodiment. Each aberration diagram shows d-line and g-line values, respectively.
  • the second optical system OS2 of this example appropriately corrects various aberrations and has high optical performance for the d-line and the g-line.
  • the optical system 1 of this embodiment has the same general configuration as the optical system 1 of the first embodiment described with reference to FIG.
  • the prism P is a dichroic prism having a branching surface BF that transmits near-infrared light and reflects visible light.
  • the first optical system OS1 of this embodiment images the light (visible light) emitted from the front lens group GR1 and reflected by the branching surface BF and the total reflection surface TRF of the prism P onto the image plane I1.
  • the second optical system OS2 of this embodiment images the light (near infrared light) emitted from the front lens group GR1 and transmitted through the branching surface BF of the prism P onto the image plane I2.
  • the optical system 1 of this embodiment appropriately controls the light reflected by the branching surface BF and the light transmitted by the branching surface BF out of the incident light by the first optical system OS1 and the second optical system OS2, respectively. It can be imaged.
  • FIG. 6 is a cross-sectional view of the first optical system OS1 included in the optical system 1 of the second embodiment.
  • the first optical system OS1 of this embodiment includes, in order from the object side, a meniscus-shaped negative lens L1 with a convex surface facing the object side, a biconcave negative lens L2, and a meniscus-shaped negative lens L2 with a convex surface facing the object side.
  • It has a cemented negative lens L13 and a biconcave negative lens L14, a meniscus positive lens L15 with a convex surface facing the object side, and a meniscus positive lens L16 with a convex surface facing the object side. .
  • An image sensor composed of a CCD, CMOS, or the like is arranged on the image plane I1.
  • a filter FL1 is arranged between the positive lens L16 disposed closest to the image plane I1 and the image plane I1.
  • the negative lens L1, the negative lens L2, and the positive lens L3 are included in the front lens group GR1. Further, the positive lens L11, the aperture stop ST1, the negative lens L12, the cemented negative lens of the negative lens L13 and the positive lens L14, the positive lens L15, and the positive lens L16 are included in the first rear lens group GR2L. included.
  • Table 2-1 lists the values of the specifications of the first optical system OS1 of this example.
  • FIG. 7 is a diagram showing various aberrations of the first optical system OS1 included in the optical system 1 of the second embodiment. Each aberration diagram shows d-line and g-line values, respectively.
  • the first optical system OS1 of this example appropriately corrects various aberrations and has high optical performance for the d-line and the g-line.
  • FIG. 8 is a cross-sectional view of the second optical system OS2 included in the optical system 1 of the second embodiment.
  • the second optical system OS2 of this embodiment includes, in order from the object side, a meniscus-shaped negative lens L1 with a convex surface facing the object side, a biconcave negative lens L2, and a meniscus-shaped negative lens L2 with a convex surface facing the object side.
  • L23, and a biconvex positive lens L24 is a biconvex positive lens L24.
  • An image sensor composed of a CCD, CMOS, etc. is arranged on the image plane I2.
  • the negative lens L1, the negative lens L2, and the positive lens L3 are included in the front lens group GR1. Further, the negative lens L21, the aperture stop ST2, the positive lens L22, the positive lens L23, and the positive lens L24 are included in the second rear lens group GR2S.
  • Table 2-2 lists the values of the specifications of the second optical system OS2 of this example.
  • FIG. 9 is a diagram showing various aberrations of the second optical system OS2 included in the optical system 1 of the second embodiment. Each aberration diagram shows s-line values.
  • the second optical system OS2 of this example appropriately corrects various aberrations and has high optical performance for the s-line.
  • the optical system 1 of this embodiment has the same general configuration as the optical system 1 of the first embodiment described with reference to FIG.
  • the prism P is a dichroic prism having a branching surface BF that transmits visible light and reflects near-infrared light.
  • the first optical system OS1 of this embodiment images the light (near infrared light) emitted from the front lens group GR1 and reflected by the branching surface BF and the total reflection surface TRF of the prism P onto the image plane I1.
  • the second optical system OS2 of this embodiment images the light (visible light) emitted from the front lens group GR1 and transmitted through the branching surface BF of the prism P onto the image plane I2.
  • the optical system 1 of this embodiment appropriately controls the light reflected by the branching surface BF and the light transmitted by the branching surface BF out of the incident light by the first optical system OS1 and the second optical system OS2, respectively. It can be imaged.
  • FIG. 10 is a cross-sectional view of the first optical system OS1 included in the optical system 1 of the third embodiment.
  • the first optical system OS1 of this embodiment includes, in order from the object side, a meniscus-shaped negative lens L1 with a convex surface facing the object side, a biconcave negative lens L2, and a meniscus-shaped negative lens L2 with a concave surface facing the object side.
  • An image sensor composed of a CCD, CMOS, or the like is arranged on the image plane I1.
  • a filter FL1 is arranged between the positive lens L15, which is arranged closest to the image plane I1, and the image plane I1.
  • the negative lens L1, the negative lens L2, and the positive lens L3 are included in the front lens group GR1. Further, the positive lens L11, the aperture stop ST1, the positive lens L12, the positive lens L13, the positive lens L14, and the positive lens L15 are included in the first rear lens group GR2L.
  • Table 3-1 lists the values of the specifications of the first optical system OS1 of this example.
  • FIG. 11 is a diagram showing various aberrations of the first optical system OS1 included in the optical system 1 of the third embodiment. Each aberration diagram shows s-line values.
  • the first optical system OS1 of this example appropriately corrects various aberrations and has high optical performance with respect to the s-line.
  • FIG. 12 is a cross-sectional view of the second optical system OS2 included in the optical system 1 of the third embodiment.
  • the second optical system OS2 of this embodiment includes, in order from the object side, a meniscus-shaped negative lens L1 with a convex surface facing the object side, a biconcave negative lens L2, and a meniscus-shaped negative lens L2 with a concave surface facing the object side.
  • It has a cemented negative lens L23 and a biconcave negative lens L24, a meniscus-shaped positive lens L25 with a convex surface facing the object side, and a meniscus-shaped positive lens L26 with a convex surface facing the object side. .
  • An image sensor composed of a CCD, CMOS, etc. is arranged on the image plane I2.
  • a filter FL2 is disposed between the positive lens L26, which is disposed closest to the image plane I2, and the image plane I2.
  • the negative lens L1, the negative lens L2, and the positive lens L3 are included in the front lens group GR1. Further, the positive lens L21, the aperture stop ST2, the positive lens L22, the cemented negative lens of the positive lens L23 and the negative lens L24, the positive lens L25, and the positive lens L26 are included in the second rear lens group GR2S. included.
  • Table 3-2 lists the values of the specifications of the second optical system OS2 of this example.
  • FIG. 13 is a diagram showing various aberrations of the second optical system OS2 included in the optical system 1 of the third embodiment. Each aberration diagram shows d-line and g-line values, respectively.
  • the second optical system OS2 of this example appropriately corrects various aberrations and has high optical performance for the d-line and the g-line.
  • f(L) is the focal length of the first optical system OS1
  • f(S) is the focal length of the second optical system OS2.
  • TL(L) is the optical total length of the first optical system OS1
  • TL(S) is the optical total length of the second optical system OS2.
  • f(gr1) is the composite focal length of the front lens group GR1.
  • f(gr1n) is the composite focal length of the negative lens arranged in succession from the negative lens disposed closest to the object side to the image plane side among the negative lenses included in the front lens group GR1.
  • f(gr1p) is the composite focal length of the positive lens arranged in succession from the positive lens disposed closest to the object side to the image plane side among the positive lenses included in the front lens group GR1.
  • T(gr1) is the distance on the optical axis from the lens surface of the front lens group GR1 closest to the object side to the lens surface of the front lens group GR1 closest to the image plane.
  • T(pL) is the length of the prism on the optical axis in the first optical system OS1
  • T(pS) is the length of the prism on the optical axis in the second optical system OS2.
  • f(gr2L) is the composite focal length of the lens closer to the image plane than the aperture stop ST1 in the first rear lens group GR2L
  • f(gr2S) is the composite focal length of the lens closer to the image plane than the aperture stop ST2 in the second rear lens group GR2S. This is the composite focal length of the side lens.
  • f(lL) is the focal length of the lens closest to the image plane in the first rear lens group GR2L
  • f(lS) is the focal length of the lens closest to the image plane in the second rear lens group GR2S.
  • Nave(s) is the average refractive index for the s-line of the negative lens included in the front lens group GR1.
  • 2 ⁇ L is the total angle of view of the first optical system OS1
  • 2 ⁇ S is the total angle of view of the second optical system OS2.
  • FIG. 14 is a schematic diagram of an optical device 10 including the optical system 1 of this embodiment.
  • the optical device 10 includes the optical system 1 according to the first embodiment, an information processing device 2, a first imaging section IS1, and a second imaging section IS2.
  • the first imaging section IS1 and the second imaging section IS2 each include an imaging element configured from a CCD, CMOS, or the like.
  • the optical system 1 appropriately controls each of the incident light reflected by the branching surface BF and the light transmitted by the branching surface BF by a first optical system OS1 and a second optical system OS2. to form an image.
  • the first imaging section IS1 and the second imaging section IS2 are arranged on the image plane I1 of the first optical system OS1 and the image plane I2 of the second optical system OS2, respectively, and output data corresponding to the incident light.
  • the information processing device 2 executes processing using data output by each of the first imaging section IS1 and the second imaging section IS2.
  • the optical system 1 included in the optical device 10 has a branching surface BF that transmits visible light among the light that enters the optical system 1 from the object and reflects near-infrared light.
  • the first optical system OS1 included in the optical system 1 forms an image of near-infrared light
  • the second optical system OS2 forms an image of visible light.
  • the information processing device 2 included in the optical device 10 detects the distance to the target object from the image formed by the first optical system OS1. Further, the information processing device 2 included in the optical device 10 detects the appearance of the object by generating image data from the image obtained by the second optical system OS2.
  • the optical device 10 appropriately forms images of the light transmitted by the branching surface BF and the light reflected by the branching surface BF among the incident light, and performs processing using each image. be able to.
  • the optical device 10 includes an optical system in which the first optical system OS1 forms an image of visible light and the second optical system OS2 forms an image of near-infrared light. You can.
  • the information processing device 2 detects the appearance of the object by generating image data from the image formed by the first optical system OS1, and detects the distance from the image formed by the second optical system OS2 to the object.
  • FIG. 15 is a flowchart outlining the method for manufacturing the optical system 1 of this embodiment.
  • the method for manufacturing the optical system 1 of this embodiment shown in FIG. 16 includes the following steps S1 and S2.
  • Step S1 Prepare a front lens group GR1, a prism P having a branching surface BF, a first rear lens group GR2L, and a second rear lens group GR2S.
  • Step S2 Each lens group and prism P are arranged so as to satisfy the following conditional expression. (1) 0.80 ⁇ -f(gr1n)/f(L) ⁇ 4.30 however, f(gr1n): Synthetic focal length of the negative lens disposed closest to the object side among the negative lenses included in the front lens group and the negative lens disposed continuously on the image plane side f(L): First optical system focal length of
  • an optical system of the present embodiment it is possible to manufacture an optical system that appropriately images each of the light transmitted by the branching surface and the light reflected by the branching surface among the incident light.
  • the lens surface may be formed of a spherical surface, a flat surface, or an aspherical surface. It is preferable that the lens surface is spherical or flat because it facilitates lens processing and assembly adjustment and prevents deterioration of optical performance due to errors in processing and assembly adjustment. Further, it is preferable that the lens surface is spherical or flat because there is less deterioration in depiction performance when the image plane shifts.
  • the aspherical surface may be formed by grinding the glass or by glass molding using a mold having an aspherical shape, and may be formed on the surface of a resin bonded to the surface of the glass. Good too.
  • the lens surface may be a diffractive surface, and the lens may be a gradient index lens (GRIN lens) or a plastic lens.
  • an antireflection film having high transmittance over a wide wavelength range may be applied to the lens surface of the lens constituting the optical system of this embodiment. This makes it possible to reduce flare and ghost and achieve optical performance with high contrast.
  • a lens frame or the like may be used instead of providing an independent member as the aperture diaphragm.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Lenses (AREA)

Abstract

L'invention concerne un système optique comprenant : un premier système optique ayant un groupe de lentilles avant, un prisme ayant une surface de ramification qui ramifie la lumière incidente, et un premier groupe de lentilles arrière sur lequel la lumière ayant une longueur de trajet optique plus longue lorsqu'elle passe à travers le prisme parmi les lumières ramifiées est incident ; et un second système optique ayant un groupe de lentilles avant, un prisme et un second groupe de lentilles arrière sur lequel la lumière ayant une longueur de trajet optique plus courte lors du passage à travers le prisme parmi les lumières ramifiées est incidente. Le système optique est configuré de façon à satisfaire à l'expression conditionnelle suivante.　0,80 < -f(gr1n)/f(L) < 4,30 Ici, f(gr1n) est la longueur focale combinée des lentilles négatives, parmi les lentilles négatives incluses dans le groupe de lentilles avant, qui sont disposées en continu vers un côté de surface d'image à partir de la lentille négative disposée le plus près du côté objet, et f(L) est la longueur focale du premier système optique.
PCT/JP2023/025321 2022-07-07 2023-07-07 Système optique, dispositif optique et procédé de fabrication d'un système optique WO2024010090A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050200946A1 (en) * 2004-03-09 2005-09-15 Bryant Kyle R. Miniature high-resolution multi-spectral objective lens
JP2011080976A (ja) * 2009-10-07 2011-04-21 Topins Co Ltd 熱画像カメラ用の一軸型レンズモジュール
WO2014162991A1 (fr) * 2013-04-02 2014-10-09 株式会社ニコン・トリンブル Dispositif de télémétrie
US11143847B1 (en) * 2017-09-28 2021-10-12 Apple Inc. Optical system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050200946A1 (en) * 2004-03-09 2005-09-15 Bryant Kyle R. Miniature high-resolution multi-spectral objective lens
JP2011080976A (ja) * 2009-10-07 2011-04-21 Topins Co Ltd 熱画像カメラ用の一軸型レンズモジュール
WO2014162991A1 (fr) * 2013-04-02 2014-10-09 株式会社ニコン・トリンブル Dispositif de télémétrie
US11143847B1 (en) * 2017-09-28 2021-10-12 Apple Inc. Optical system

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