WO2017046901A1 - Système optique et dispositif de capture d'image - Google Patents

Système optique et dispositif de capture d'image Download PDF

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Publication number
WO2017046901A1
WO2017046901A1 PCT/JP2015/076333 JP2015076333W WO2017046901A1 WO 2017046901 A1 WO2017046901 A1 WO 2017046901A1 JP 2015076333 W JP2015076333 W JP 2015076333W WO 2017046901 A1 WO2017046901 A1 WO 2017046901A1
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Prior art keywords
optical system
axis
image
rotational symmetry
reflecting surface
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PCT/JP2015/076333
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English (en)
Japanese (ja)
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研野　孝吉
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オリンパス株式会社
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Priority to PCT/JP2015/076333 priority Critical patent/WO2017046901A1/fr
Publication of WO2017046901A1 publication Critical patent/WO2017046901A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/08—Catadioptric systems
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor

Definitions

  • the present invention relates to a small and high resolution catadioptric optical system having a wide angle of view and F- ⁇ characteristics.
  • a fish-eye lens composed of a transmission lens system is generally used as a wide-angle imaging optical system.
  • the fisheye lens since the fisheye lens has a wide angle of view, chromatic aberration is likely to occur. Further, the fish-eye lens has a complicated structure when trying to obtain a good resolving power for a full-screen image.
  • Patent Document 1 discloses an optical system including a front group having two reflecting surfaces and a lens system without using a fisheye lens.
  • This optical system is an adapter reflecting optical system in which the relationship between two reflecting surfaces is defined so as to satisfy the condition of enlarging the peripheral image from the center.
  • An optical system includes: A front group that is rotationally symmetric about a single rotational symmetry axis that passes through the center of the image plane; A rear group rotationally symmetric about the rotational symmetry axis; An opening, With The front group has a first reflecting surface and a second reflecting surface; The light beam incident on the front group from at least one object surface is reflected to the object side by the first reflecting surface having a negative refractive power with the convex surface facing the object side, and does not intersect the rotational symmetry axis and does not intersect the second symmetry axis.
  • a direction along the light traveling direction of the rotationally symmetric axis in the rear group is a Z-axis positive direction
  • a direction orthogonal to the Z-axis is a Y-axis positive direction
  • a plane including the Z-axis and the Y-axis Is the YZ plane, the direction perpendicular to the YZ plane and constituting the right-handed orthogonal coordinate system with respect to the Y axis and the Z axis is the X axis positive direction
  • a ray incident from the center of the angle of view is a central principal ray
  • a ray incident parallel to the central principal ray is a dependent ray
  • the entire optical system satisfies the following conditional expression (1).
  • Y A + F ⁇ ⁇ (1)
  • Y is the distance from the rotational symmetry axis of the image height in the YZ plane
  • A is any positive constant
  • F h / ⁇ 0
  • F is the focal length of the entire optical system
  • h is the distance between the central principal ray and the dependent ray before incidence
  • ⁇ 0 is an angle formed by the central principal ray and the dependent ray incident on the image plane from the final surface of the rear group
  • ⁇ is the angle of incidence of the central chief ray on the optical system, It is.
  • An imaging apparatus is The optical system; An image sensor having a plurality of pixels disposed on the image plane of the optical system; It is characterized by providing.
  • FIG. 1 is a cross-sectional view including a rotational symmetry axis of an optical system of Example 1.
  • FIG. Sectional drawing containing the rotational symmetry axis of the optical system of Example 2 is shown.
  • Sectional drawing containing the rotational symmetry axis of the optical system of Example 3 is shown.
  • Sectional drawing containing the rotational symmetry axis of the optical system of Example 4 is shown. It is a figure which shows an example of the imaging device using the optical system of this embodiment. It is a block diagram which shows the internal circuit of the principal part of the imaging device using the optical system of this embodiment.
  • optical system 1 of this embodiment will be described.
  • FIG. 1 is a cross-sectional view taken along a rotational symmetry axis C of an optical system 1 according to an embodiment of the present invention.
  • FIG. 2 is a diagram showing the optical paths of the central principal ray and the dependent ray of the optical system according to one embodiment of the present invention.
  • FIG. 3 is a cross-sectional view taken along the axis of rotational symmetry by enlarging the vicinity of the first reflecting surface of the optical system according to an embodiment of the present invention.
  • FIG. 4 is a cross-sectional view taken along the axis of rotational symmetry by enlarging the vicinity of the image plane of the optical system according to an embodiment of the present invention.
  • FIG. 5 is a diagram for explaining A in the conditional expression (1).
  • FIG. 5A shows an optical system when A in conditional expression (1) is an arbitrary constant other than 0, and FIG. 5B shows an optical system when A in conditional expression (1) is 0.
  • FIG. 2 to 5 for easy understanding, only the light beam incident from the lower side of the rotational symmetry axis C (the negative direction of the Y axis) out of the two optical paths existing across the rotational symmetry axis C is shown. Show.
  • This embodiment provides a high-resolution optical system and an imaging apparatus that are small in size, have a wide observation angle of view, and have F- ⁇ characteristics in the entire optical system including the rear group.
  • the direction along the light traveling direction of the rotationally symmetric axis C is the Z-axis positive direction
  • the direction orthogonal to the Z-axis is the Y-axis positive direction
  • the plane includes the Z-axis and the Y-axis. Is the YZ plane, and the direction perpendicular to the YZ plane and constituting the right-handed orthogonal coordinate system with respect to the Y axis and the Z axis is the positive X axis direction.
  • the coordinate system is rotated by setting the origin O of the decentered optical surface of the optical system 1 at a position 0.1 mm from the position where the aperture Op in the diaphragm surface S and the rotational symmetry axis C intersect to the object side.
  • the direction along the light traveling direction of the symmetry axis C is the Z-axis positive direction
  • the direction perpendicular to the origin O from the Z-axis is the Y-axis positive direction
  • the plane including the Z-axis and the Y-axis is the YZ plane.
  • the direction passing through the origin O and orthogonal to the YZ plane and constituting the right-handed orthogonal coordinate system with respect to the Y-axis and Z-axis is defined as the positive X-axis direction.
  • the optical system 1 of the present embodiment includes a front group Gf that is rotationally symmetric with respect to a single rotationally symmetric axis C passing through the center of the image plane Im, and a plurality of lenses Lb 1 to Lb 1 that are rotationally symmetric with respect to the rotationally symmetric axis C.
  • the front group Gf includes a rear group Gb having Lb 3 and an opening Op, and the front group Gf has a first reflecting surface Lf 1 and a second reflecting surface Lf 2 , and moves from at least one object surface (not shown) to the front group Gf.
  • the incident light beam is reflected to the object side by the first reflecting surface Lf 1 having a negative refractive power with the convex surface facing the object side, and reflected to the image side by the second reflecting surface Lf 2 without intersecting the rotational symmetry axis.
  • An optical path is formed, the light beam passing through the rear group Gb and the opening Op, and incident on the front group Gf is separated from the rotational symmetry axis C of the image plane Im without intermediate imaging within the cross section including the rotational symmetry axis C.
  • An image is formed at a certain position, and the following conditional expression (1) is satisfied in the entire optical system.
  • Y A + F ⁇ ⁇ (1)
  • Y is the distance from the rotational symmetry axis C of the image height in the YZ plane
  • A is any positive constant
  • F h / ⁇ 0
  • F is the focal length of the entire optical system 1
  • h is the distance between the central principal ray Lc incident from the center of the angle of view of the optical system 1 and the dependent ray Ls incident on the optical system 1 in parallel to the central principal ray Lc
  • ⁇ 0 is an angle formed by the central principal ray Lc incident on the image plane from the final surface of the optical system 1 and the dependent ray Ls
  • ⁇ is an incident angle of the central principal ray Lc to the optical system 1, It is.
  • the optical system 1 of the present embodiment can enhance the linearity between the incident field angle and the image height.
  • the optical system 1 is formed rotationally symmetric with respect to a single rotational symmetry axis C, the lens can be easily processed and assembled.
  • a wide-angle optical system In the case of a wide-angle optical system, it is generally a retrofocus type, and a strong negative power is arranged in the front group.
  • a strong negative lens is disposed on the object side in the refractive optical system, it is difficult to remove the aberration generated by the lens, and the lens becomes large. Therefore, in the optical system 1 of the present embodiment, a reflecting surface having a strong negative power is disposed in the front group, and the occurrence of chromatic aberration that is particularly likely to occur in the refractive optical system is set to 0 in principle.
  • the light beam from the object is reflected to the object side by the first reflecting surface Lf 1 , and is reflected to the image side by the second reflecting surface Lf 2 without intersecting the rotational symmetry axis C. Therefore, a so-called Z-shaped optical path is formed to minimize the aberration generated on the reflecting surface.
  • the optical path in the front group Gf of the central principal ray Lc that enters from the center of the observation angle of view and passes through the center of the aperture Op in the diaphragm surface S intersects the rotational symmetry axis C. Since no intermediate image is formed, the optical path can be shortened, and the optical system 1 can be formed in a small size.
  • a central principal ray Lc that enters from the central angle of view in the YZ section and passes through the center of the aperture Op in the diaphragm surface S, and a dependent ray that enters parallel to the central principal ray Lc. Ls is defined.
  • the central principal ray Lc incident from the central angle of view in the YZ cross section and the dependent ray Ls incident parallel to the central principal ray Lc at a distance h are obtained.
  • ⁇ 1 be the angle of the reflected light formed by the central principal ray Lc and the dependent ray Ls when incident on one reflecting surface Lf 1 .
  • the angle formed when the central principal ray Lc and the dependent ray Ls exit the final surface Lb 32 of the rear group Gb of the optical system 1 and is incident on the image plane Im is ⁇ 0 .
  • the focal length F of the entire optical system is h / ⁇ 0 .
  • the distance h is a small numerical value, for example, about 0.1 mm.
  • the image is formed at a position spaced apart from the rotational symmetry axis C by A on the image plane Im, and thus exists with the rotational symmetry axis C interposed therebetween. It is arranged so as to suppress optical interference in the optical path, and an image with good contrast is obtained.
  • FIG. 5A shows a light beam L incident at an incident angle of ⁇ 10 ° below the rotational symmetry axis C (negative direction of the Y axis) with respect to the enlarged view of the front group of the optical system 1 of the present embodiment.
  • -10 is shown.
  • Ray contained in the light beam L -10 is present only in the region of the lower side of the axis of rotational symmetry C (negative direction of the Y axis) before entering the second reflecting surface Lf 2. This is because the light beam having an observation angle of view of 0 ° is shifted by A in conditional expression (1).
  • a in the conditional expression (1) interference between the two optical paths existing across the rotational symmetry axis C is suppressed until it enters the second reflecting surface Lf 2 , so that a clear image with good contrast can be obtained. Can be obtained.
  • the optical system 1 of this embodiment satisfies the following conditional expression (2).
  • H is the maximum image height, It is.
  • conditional expression (2) If the upper limit of conditional expression (2) is exceeded, the imaging area cannot be increased, the effective number of pixels cannot be obtained, and the resolution of the formed image is reduced.
  • the optical system 1 of this embodiment satisfies the following conditional expression (3). -5 ⁇ 1- ⁇ 2 ⁇ 15 (3)
  • ⁇ 1 is an angle with respect to the rotational symmetry axis of a line perpendicular to the tangent at the position where the central principal ray hits the first reflecting surface Lf 1 of the front group Gf in the YZ plane with the counterclockwise direction being positive
  • ⁇ 2 is an angle with respect to the rotational symmetry axis of a line perpendicular to the tangent at the position where the central principal ray hits the second reflecting surface Lf 2 of the front group Gf in the YZ plane with the counterclockwise direction being positive
  • Conditional expression (3) represents the difference between the inclination of the first reflecting surface Lf 1 and the inclination of the second reflecting surface Lf 2 of the optical system 1 of the present embodiment.
  • the optical system 1 of this embodiment satisfies the following conditional expression (4). -5 ⁇ 1 ⁇ 10 (4)
  • ⁇ 1 is an angle with respect to the rotational symmetry axis of a line perpendicular to the tangent at the position where the central principal ray Lc hits the first reflecting surface Lf 1 of the front group Gf in the YZ plane with the counterclockwise direction being positive; It is.
  • Conditional expression (4) is the same as the inclination of the first reflecting surface Lf 1 of the optical system 1 of the present embodiment from the Y axis, and reflects the light beam with an observation angle of view of 90 ° on one side by the first reflecting surface Lf 1. Represents a condition for reflection while minimizing the occurrence of aberration on the second reflecting surface Lf 2 on the object side.
  • the optical system 1 of this embodiment satisfies the following conditional expression (5). ⁇ 15 ⁇ 2 ⁇ 0 (5)
  • ⁇ 2 is an angle with respect to the rotational symmetry axis of a line perpendicular to the tangent at the position where the central principal ray hits the second reflecting surface Lf 2 of the front group Gf in the YZ plane with the counterclockwise direction being positive, It is.
  • Conditional expression (5) is the same as the inclination of the second reflecting surface Lf 2 of the optical system 1 of the present embodiment from the Y axis, and reflects the light beam reflected by the first reflecting surface Lf 1 toward the rear group Gb. Represents a condition.
  • conditional expression (5) If the lower limit of conditional expression (5) is not reached, the light beam cannot be reflected at the optimum angle toward the rear group Gb unless the first reflecting surface Lf 1 is increased, and the entire optical system 1 is increased in size. End up.
  • the optical system 1 of this embodiment satisfies the following conditional expression (6).
  • F1 h / ⁇ 1
  • F1 is the focal length of the central principal ray hits position in the first reflecting surface Lf 1 of the front group Gf and counterclockwise in a positive and the Y-Z plane, beta 1, the angle formed by the central principal ray Lc reflected by the first reflecting surface Lf 1 of the optical system 1 and the dependent light Ls, It is.
  • Condition (6) is a ratio of the focal length for the first total system of the reflective surface Lf 1, the first reflecting surface Lf 1 having a negative focal length with a convex surface facing the object side, the entire optical system
  • a negative-positive retrofocus type power arrangement is important for widening the viewing angle.
  • conditional expression (6) If the upper limit of conditional expression (6) is exceeded, the negative focal length of the first reflecting surface Lf 1 becomes too short compared to the overall focal length of the optical system 1, and the negative refractive power becomes stronger. Aberrations occurring on the reflecting surface Lf 1 increase, and high-resolution imaging becomes difficult.
  • the optical system 1 of this embodiment satisfies the following conditional expression (7).
  • Fb is the focal length of the rear group Gb, It is.
  • Conditional expression (7) is the ratio of the focal length of the rear group Gf to the entire system.
  • Examples 1 to 4 of the optical system 1 of the present invention will be described below.
  • the configuration parameters of these optical systems will be described later.
  • the configuration parameters of these embodiments are based on the result of tracking forward rays from the object plane to the image plane Im through the front group Gf and the rear group Gb.
  • the amount of decentering from the center of the origin of the optical system in the coordinate system in which the surface is defined (X-axis direction, Y-axis direction, and Z-axis direction are X, Y, and Z, respectively) and the optical system
  • the inclination angles ( ⁇ , ⁇ , ⁇ (°), respectively) of the coordinate system defining each surface centered on the X axis, Y axis, and Z axis of the coordinate system defined at the origin are given.
  • positive ⁇ and ⁇ mean counterclockwise rotation with respect to the positive direction of each axis
  • positive ⁇ means clockwise rotation with respect to the positive direction of the Z axis.
  • the ⁇ , ⁇ , and ⁇ rotations of the central axis of the surface are performed by rotating the coordinate system defining each surface counterclockwise around the X axis of the coordinate system defined at the origin of the optical system. Then rotate it around the Y axis of the new rotated coordinate system by ⁇ and then rotate it around the Z axis of another rotated new coordinate system by ⁇ . It is.
  • optical action surfaces constituting the optical system of each embodiment when a specific surface and a subsequent surface constitute a coaxial optical system, a surface interval is given, in addition, the curvature radius of the surface, The refractive index and Abbe number of the medium are given according to conventional methods.
  • the term relating to the aspherical surface for which no data is described in the constituent parameters described later is zero.
  • the refractive index and the Abbe number are shown for the d-line (wavelength 587.56 nm).
  • the unit of length is mm.
  • an aspherical surface is a rotationally symmetric aspherical surface given by the following definition.
  • Z (Y 2 / R) / [1+ ⁇ 1 ⁇ (1 + k) Y 2 / R 2 ⁇ 1/2 ] + AY 4 + bY 6 + cY 8 + dY 10 + (a)
  • Z is an optical axis (axial principal ray) with the light traveling direction being positive, and Y is a direction perpendicular to the optical axis.
  • R is a paraxial radius of curvature
  • k is a conic constant
  • a, b, c, d,... are fourth-order, sixth-order, eighth-order, and tenth-order aspherical coefficients, respectively.
  • the Z axis of this defining formula is the axis of a rotationally symmetric aspherical surface.
  • the extended rotation free-form surface is a rotationally symmetric surface given by the following definition.
  • the curve F (Y) is translated in the positive Y direction by a distance D (or negative Y direction if negative), and then the rotationally symmetric surface formed by rotating the translated curve around the Z axis is expanded and rotated. Let it be a free-form surface.
  • the Z axis is the axis of the extended rotation free-form surface (rotation symmetry axis).
  • RDY is the radius of curvature of the spherical term in the YZ section
  • C 1 is the conic constant
  • C 2 , C 3 , C 4 , C 5 Aspheric coefficient.
  • FIG. 6 is a cross-sectional view of an example of an optical system according to an embodiment of the present invention.
  • the observation angle of view of the lower ray is ⁇ 10 ° to + 89.5 °, and the center of the angle of view is + 40 ° for convenience of design.
  • a light ray passing through the center of a certain opening Op is set as a central principal ray Lc, and the design is performed based on the central principal ray Lc.
  • Object surface (not shown) is located at infinity, it is the origin of the third surface (r3) is the front group is a virtual surface, a first reflecting surface Lf 1 is the first surface (r1), the second reflecting surface Lf 2 second It becomes the surface (r2).
  • the positions of the top surfaces of the extended rotation free-form surfaces of the first surface and the second surface are given by the eccentricity 1 and the eccentricity 2.
  • the image plane Im side of the Z axis that is the rotational symmetry axis C is positive.
  • the Y-axis is orthogonal to the Z-axis and the upper side in FIG. 6 is positive. In FIG. 6, the lower side light is used for explanation, so the top of the first surface is negative.
  • the first surface is a positive rotation. That is, the first surface is -5.525 mm lower in the Y-axis direction given by the eccentricity (1) from the origin O, and is located at a position of 4.000 mm in the Z-axis direction, and the angle is inclined by 3.178 °.
  • the shape of the first surface is a curvature radius of 9.121 mm, and the C4 term, which is a cube term, is 4.2405E-3.
  • the first surface is a rotationally symmetric surface obtained by finally rotating the Z axis as the rotationally symmetric axis C.
  • the extended rotation free-form surface has the origin of each surface on the central principal ray Lc, and the eccentricity Y corresponds to the height of the central principal ray Lc in the Y-axis direction. This is a design problem, and it is not necessary to make the center principal ray Lc coincide with the origin, and can be arbitrarily determined.
  • the second surface is similarly an extended rotation free-form surface.
  • the third surface to the diaphragm surface S is defined as 0.1 mm and is the fourth surface (r4) that forms the circular opening Op.
  • the fifth and subsequent surfaces are the same as the normal spherical lens system, and are defined by the radius of curvature and the surface interval.
  • FIG. 7 is a cross-sectional view including the rotational symmetry axis C of the optical system 1 of the first embodiment. However, in FIG. 7, only the optical path incident on one side with respect to the rotational symmetry axis C in the cross section is shown, and there are optical paths that are symmetrical with respect to the rotational symmetry axis C, but they are not shown.
  • the optical system 1 includes a rotationally symmetric front group Gf, a rotationally symmetric rear group Gb, and an aperture Op that are arranged on a single rotationally symmetric axis C that passes through the center of the image plane Im.
  • the front group Gf has two reflecting surfaces, and a light beam incident on the front group Gf from at least one object surface is reflected by the first reflecting surface Lf 1 and reflected by the second reflecting surface Lf 2.
  • the image is formed, passes through the rear group Gb and the opening Op, and forms an image at a position away from the rotational symmetry axis C of the image plane Im without intermediate imaging within the cross section including the rotational symmetry axis C.
  • the first reflecting surface Lf 1 is disposed outside the second reflecting surface Lf 2 with respect to the rotational symmetry axis.
  • the first reflecting surface Lf 1 and the second reflecting surface Lf 2 are composed of an extended rotation free-form surface.
  • the first reflecting surface Lf 1 has a negative power with a convex surface facing the object side
  • the second reflecting surface Lf 2 has a negative power with a convex surface facing the image side.
  • the rear group Gb of Example 1 includes a negative meniscus lens Lb 1 having a convex surface facing the image surface side, and a cemented lens SUb1 of the biconvex positive lens Lb 2 and the biconcave negative lens Lb 3 .
  • the optical path of the central principal ray Lc that enters the optical system 1 from the center of the viewing angle of view and passes through the center of the aperture Op in the diaphragm surface S does not intersect the rotational symmetry axis C in the front group Gf, and rotates in the rear group Gb. Do not cross the symmetry axis C.
  • FIG. 8 is a sectional view including the rotational symmetry axis C of the optical system 1 of the second embodiment. However, in FIG. 8, only an optical path incident on one side with respect to the rotational symmetry axis C in the cross section is shown, and an optical path symmetrical with respect to the rotational symmetry axis C also exists at the same time, but the illustration is omitted.
  • the optical system 1 of Example 2 includes a rotationally symmetric front group Gf, a rotationally symmetric rear group Gb, and an aperture Op, which are disposed on a single rotationally symmetric axis C passing through the center of the image plane Im.
  • the front group Gf has two reflecting surfaces, and a light beam incident on the front group Gf from at least one object surface is reflected by the first reflecting surface Lf 1 and reflected by the second reflecting surface Lf 2.
  • the image is formed, passes through the rear group Gb and the opening Op, and forms an image at a position away from the rotational symmetry axis C of the image plane Im without intermediate imaging within the cross section including the rotational symmetry axis C.
  • the first reflecting surface Lf 1 is disposed outside the second reflecting surface Lf 2 with respect to the rotational symmetry axis.
  • the first reflecting surface Lf 1 and the second reflecting surface Lf 2 are composed of an extended rotation free-form surface.
  • the first reflecting surface Lf 1 has a negative power with a convex surface facing the object side
  • the second reflecting surface Lf 2 has a negative power with a convex surface facing the image side.
  • the optical path of the central principal ray Lc that enters the optical system 1 from the center of the viewing angle of view and passes through the center of the aperture Op in the stop surface S does not intersect the rotational symmetry axis C in the front group Gf, but rotates in the rear group Gb. Do not cross the symmetry axis C.
  • FIG. 9 is a sectional view including the rotational symmetry axis C of the optical system 1 of the third embodiment. However, in FIG. 9, only an optical path incident on one side with respect to the rotational symmetry axis C in the cross section is shown, and an optical path symmetrical with respect to the rotational symmetry axis C also exists at the same time, but the illustration is omitted.
  • the optical system 1 includes a rotationally symmetric front group Gf, a rotationally symmetric rear group Gb, and an aperture Op that are disposed on a single rotationally symmetric axis C passing through the center of the image plane Im.
  • the front group Gf has two reflecting surfaces, and a light beam incident on the front group Gf from at least one object surface is reflected by the first reflecting surface Lf 1 and reflected by the second reflecting surface Lf 2.
  • the image is formed, passes through the rear group Gb and the opening Op, and forms an image at a position away from the rotational symmetry axis C of the image plane Im without intermediate imaging within the cross section including the rotational symmetry axis C.
  • the first reflecting surface Lf 1 is disposed outside the second reflecting surface Lf 2 with respect to the rotational symmetry axis.
  • the first reflecting surface Lf 1 and the second reflecting surface Lf 2 are composed of an extended rotation free-form surface.
  • the first reflecting surface Lf 1 has a negative power with a convex surface facing the object side
  • the second reflecting surface Lf 2 has a negative power with a convex surface facing the image side.
  • the rear group Gb and the image plane Im in the third embodiment are arranged between the first reflection surface Lf 1 and the second reflection surface Lf 2 in the direction of the rotational symmetry axis C.
  • the optical path of the central principal ray Lc that enters the optical system 1 from the center of the viewing angle of view and passes through the center of the aperture Op in the diaphragm surface S does not intersect the rotational symmetry axis C in the front group Gf, and rotates in the rear group Gb. Do not cross the symmetry axis C.
  • FIG. 10 is a sectional view including the rotational symmetry axis C of the optical system 1 according to the fourth embodiment. However, in FIG. 10, only an optical path incident on one side with respect to the rotational symmetry axis C in the cross section is shown, and an optical path symmetrical with respect to the rotational symmetry axis C also exists at the same time, but the illustration is omitted.
  • the optical system 1 includes a rotationally symmetric front group Gf, a rotationally symmetric rear group Gb, and an aperture Op that are arranged on a single rotationally symmetric axis C that passes through the center of the image plane Im.
  • the front group Gf has two reflecting surfaces, and a light beam incident on the front group Gf from at least one object surface is reflected by the first reflecting surface Lf 1 and reflected by the second reflecting surface Lf 2.
  • the image is formed, passes through the rear group Gb and the opening Op, and forms an image at a position away from the rotational symmetry axis C of the image plane Im without intermediate imaging within the cross section including the rotational symmetry axis C.
  • the first reflecting surface Lf 1 is disposed outside the second reflecting surface Lf 2 with respect to the rotational symmetry axis.
  • the first reflecting surface Lf 1 and the second reflecting surface Lf 2 are composed of an extended rotation free-form surface.
  • the first reflecting surface Lf 1 has a negative power with a convex surface facing the object side
  • the second reflecting surface Lf 2 has a negative power with a convex surface facing the image side.
  • Example 4 a first cemented lens SUb1 the biconvex positive lens Lb 1 and the negative meniscus lens Lb 2 having a convex surface facing the image side, a biconcave negative lens Lb 3 and a biconvex positive lens Lb 4
  • a second cemented lens SUB2 a biconvex positive lens Lb 5 and the third cemented lens SUb3 the biconcave negative lens Lb 6, made of.
  • an opening Op in the diaphragm surface S is disposed between the first cemented lens SUb1 and the second cemented lens SUb2.
  • the optical path of the central principal ray Lc that enters the optical system 1 from the center of the viewing angle of view and passes through the center of the aperture Op in the aperture plane S does not intersect the rotational symmetry axis C up to the aperture Op in the aperture plane S. It does not intersect the rotational symmetry axis C from the opening Op in the plane S to the image plane.
  • Example 1 Surface number Curvature radius Surface spacing Eccentricity Refractive index Abbe number Object surface ⁇ ⁇ 1 ERFS [1] 0.000 Eccentricity (1) 2 ERFS [2] 0.000 Eccentricity (2) 3 ⁇ 0.100 4 Diaphragm surface 1.697 5 -50.749 1.500 1.8830 40.7 6 -3.377 0.100 7 4.592 3.000 1.7991 44.3 8 -2.061 2.000 1.9229 18.9 9 7.026 0.500 Image plane ⁇ ERFS [1] RDY 9.121 C4 4.2405e-003 ERFS [2] RDY 22.601 Eccentric [1] Y -5.525 Z 4.000 ⁇ 3.178 Eccentric [2] Y -0.956 Z -2.865 ⁇ -7.885 C1 -2.6533e + 000 C4 4.6187e-003 Specifications Viewing angle of view 100 ° (-10 ° to + 90 °) Diaphragm diameter (diameter of aperture surface S) ⁇ 1.000mm Image size ⁇ 0.828
  • Example 1 Example 2
  • Example 3 Example 4
  • Formula (2) A / H 0.334 0.325 0.327 0.320
  • Formula (3) ⁇ 1- ⁇ 2 11.064 12.354 7.942 6.610
  • Formula (4) ⁇ 1 3.179 5.569 3.122 -0.751
  • Formula (5) ⁇ 2 ⁇ 7.885 ⁇ 6.786 ⁇ 4.820 ⁇ 7.361
  • Formula (6) F1 / F -8.141 -7.287 -8.802 -11.007 Fb 2.373 2.916 1.739 2.293
  • FIG. 11 is a diagram illustrating an example in which the optical system 1 of the present embodiment is used in the imaging device 2.
  • the imaging device 2 shown in FIG. 11 is disposed on the image plane of the optical system 1 and the support 20 that supports the first reflecting surface Lf 1 and the second reflecting surface Lf 2 of the optical system 1 of the present embodiment. And an imaging device 32 having pixels.
  • the support 20 shown in FIG. 11 is a dome-shaped member that transmits light.
  • the first reflective surface Lf 1 is attached toward the bottom 20b inside the top 20a of the support 20, and the second reflective surface Lf toward the top 20a inside the bottom 20b so as to block a part of the space of the support 20. Install 2 .
  • FIG. 12 is a block diagram showing an internal circuit of a main part of the imaging device 2 using the optical system 1 of the present embodiment.
  • the imaging apparatus 2 is connected to the operation unit 21, the control unit 22 connected to the operation unit 21, and the control signal output port of the control unit 22 via buses 23 and 24.
  • the image pickup drive circuit 25, the temporary storage memory 26, the image processing unit 27, and the storage unit 28 are provided.
  • the temporary storage memory 26, the image processing unit 27, and the storage unit 28 described above can mutually input and output data via the bus 31.
  • an imaging device 32 such as a CCD and a CDS / ADC unit 33 are connected to the imaging drive circuit 25.
  • the operation unit 21 includes various input buttons and switches, and notifies the control unit 22 of event information input from the operator via these buttons.
  • the control unit 22 is a central processing unit composed of, for example, a CPU, and includes a program memory (not shown) and controls the imaging device 2 according to a program stored in the program memory.
  • the image pickup device 32 is driven and controlled by the image pickup drive circuit 25, converts the amount of light for each pixel of the object image formed via the optical system 1 into an electric signal, and outputs the electric signal to the CDS / ADC unit 33.
  • the CDS / ADC unit 33 amplifies the electrical signal input from the image sensor 32 and performs analog / digital conversion, and raw video data (Bayer data, hereinafter RAW data) obtained by performing only the amplification and digital conversion. Is output to the temporary storage memory 26.
  • the temporary storage memory 26 is a buffer made of, for example, SDRAM or the like, and is a memory device that temporarily stores RAW data output from the CDS / ADC unit 33.
  • the image processing unit 27 reads out RAW data stored in the temporary storage memory 26 or RAW data stored in the storage unit 28, and performs various corrections including distortion correction based on the image quality parameter specified by the control unit 22. It is a circuit that performs image processing electrically.
  • the storage unit 28 detachably mounts a card-type or stick-type storage medium made of, for example, a flash memory or the like, and RAW data transferred from the temporary storage memory 26 or an image by the image processing unit 27 to these flash memories. Record and store the processed image data.
  • the imaging device 2 configured in this way is small, has a wide observation angle of view, and has high resolution with F- ⁇ characteristics as a whole. Is possible.

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

Abstract

L'invention vise à fournir : un système optique à haute résolution qui est petit, qui a un large angle de vue d'observation, et qui a des caractéristiques F-θ pour l'ensemble du système optique qui comprend un groupe arrière ; et un dispositif de capture d'image. À cet effet, la présente invention est caractérisée par les éléments suivants : un système optique 1 comprend un groupe avant Gf qui est symétrique en rotation par rapport à un seul axe de symétrie de rotation C qui passe par le centre d'une surface d'image Im, un groupe arrière Gb qui est symétrique en rotation par rapport à l'axe de symétrie de rotation C, et une ouverture Op ; le groupe avant Gf comprend une première surface réfléchissante Lf1 et une seconde surface réfléchissante Lf2 ; des faisceaux lumineux qui sont incidents sur le groupe avant Gf provenant de la surface d'objet sont réfléchis vers le côté objet par la première surface réfléchissante Lf1 dont la surface convexe fait face au côté objet et qui a une puissance de réfraction négative, forment un trajet de lumière qui est réfléchi vers le côté image par la seconde surface réfléchissante Lf2 sans croiser l'axe de symétrie de rotation, et passent par le groupe arrière Gb et l'ouverture Op ; des faisceaux lumineux incidents qui sont incidents sur le groupe avant Gf forment une image à une position qui est séparée de l'axe de symétrie de rotation C de la surface d'image Im, sans former une image intermédiaire à l'intérieur d'une section transversale comprenant l'axe de symétrie de rotation C ; et l'ensemble du système optique satisfait la formule conditionnelle (1) suivante. (1): Y=A+F×θ. Dans la formule conditionnelle : Y est la distance à l'axe de symétrie de rotation C dans le plan Y-Z ; A est une quelconque constante positive, F=h/β0 ; F est la longueur focale de l'ensemble du système optique 1 ; h est la distance entre des rayons de lumière principale centraux Lc entrant par le centre d'angle de vue du système optique 1 et des rayons de lumière subordonnés Ls incidents sur le système optique 1, parallèles à l'axe des rayons de lumière principale Lc ; β0 est un angle formé par les rayons de lumière principale centraux Lc incidents sur la surface d'image provenant de la surface finale du système optique 1 et les rayons lumineux subordonnés Ls ; et θ est l'angle d'incidence des rayons de lumière principale centraux Lc incidents sur le système optique 1.
PCT/JP2015/076333 2015-09-16 2015-09-16 Système optique et dispositif de capture d'image WO2017046901A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107589617A (zh) * 2017-09-29 2018-01-16 维沃移动通信有限公司 一种摄像头及移动终端

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994012905A1 (fr) * 1992-11-30 1994-06-09 Mitsubishi Denki Kabushiki Kaisha Dispositif optique de conversion de l'angle de champ du type a reflexion
JP2009015252A (ja) * 2007-07-09 2009-01-22 Olympus Corp 光学素子、それを備えた光学系及びそれを用いた内視鏡
JP2009015253A (ja) * 2007-07-09 2009-01-22 Olympus Corp 光学素子、それを備えた光学系及びそれを用いた内視鏡
JP2010020066A (ja) * 2008-07-10 2010-01-28 Olympus Corp 光学素子、それを備えた光学系及びそれを用いた内視鏡
WO2015091002A1 (fr) * 2013-12-20 2015-06-25 Thales Module optique d'imagerie a champ hyper-hemispherique et distorsion controlee, compatible d'un environnement exterieur

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994012905A1 (fr) * 1992-11-30 1994-06-09 Mitsubishi Denki Kabushiki Kaisha Dispositif optique de conversion de l'angle de champ du type a reflexion
JP2009015252A (ja) * 2007-07-09 2009-01-22 Olympus Corp 光学素子、それを備えた光学系及びそれを用いた内視鏡
JP2009015253A (ja) * 2007-07-09 2009-01-22 Olympus Corp 光学素子、それを備えた光学系及びそれを用いた内視鏡
JP2010020066A (ja) * 2008-07-10 2010-01-28 Olympus Corp 光学素子、それを備えた光学系及びそれを用いた内視鏡
WO2015091002A1 (fr) * 2013-12-20 2015-06-25 Thales Module optique d'imagerie a champ hyper-hemispherique et distorsion controlee, compatible d'un environnement exterieur

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107589617A (zh) * 2017-09-29 2018-01-16 维沃移动通信有限公司 一种摄像头及移动终端
CN107589617B (zh) * 2017-09-29 2020-10-20 维沃移动通信有限公司 一种摄像头及移动终端

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