WO2011004443A1 - 結像光学系 - Google Patents
結像光学系 Download PDFInfo
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- WO2011004443A1 WO2011004443A1 PCT/JP2009/007194 JP2009007194W WO2011004443A1 WO 2011004443 A1 WO2011004443 A1 WO 2011004443A1 JP 2009007194 W JP2009007194 W JP 2009007194W WO 2011004443 A1 WO2011004443 A1 WO 2011004443A1
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- lens
- optical system
- imaging optical
- object side
- vertical axis
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
- G02B5/1876—Diffractive Fresnel lenses; Zone plates; Kinoforms
- G02B5/189—Structurally combined with optical elements not having diffractive power
Definitions
- the present invention relates to an imaging optical system used for a digital camera, a mobile phone with an imaging function, a scanner, and the like.
- CMOS Complementally Metal Oxide emi Semiconductor
- BSI Backside Illumination
- Patent Document 1 Japanese Patent No. 3342030 Patent Document 2 Japanese Patent No. 40403667 Patent Document 3 Japanese Patent No. 4032668
- An imaging optical system includes a first lens having positive power from the object side to the image plane side, a second lens that is a convex meniscus lens on the image side, a third lens having positive power, and a negative lens.
- An imaging optical system including a fourth lens having power.
- the power in the vicinity of the principal ray in the meridional direction of the third lens has a positive region in the paraxial region and a negative region at a position away from the optical axis.
- the power in the vicinity of the chief ray in the meridional direction of the fourth lens is negative in the paraxial region and has a region that is positive at a position away from the optical axis.
- the first lens includes a diffraction grating on the image side surface.
- the focal length of the second lens is f 2
- the combined focal length of the imaging optical system is f T
- the distance from the object side to the image plane among the vertices of the aperture surface or the object side surface of the first lens is TTL, Is satisfied.
- the axial chromatic aberration is corrected (achromatic) by the diffraction grating provided on the image plane side of the first lens, so that the absolute power of the second lens is satisfied so that the expression (1) is satisfied.
- the value is reduced. Therefore, the assembly tolerance can be increased and the manufacturing cost can be reduced.
- a compact imaging optical system can be realized by configuring so that the expression (2) is satisfied.
- the focal length of the fourth lens is f 4
- the refractive index of the d-line of the material of the fourth lens is n 4 , Is satisfied.
- the Petzval sum is reduced, and an imaging optical system having a small field curvature in the vicinity of the optical axis is realized, and a high image height position is achieved. It is possible to smoothly and gently control the change in curvature of field up to.
- the diffraction grating is composed of annular zones, and the number of annular zones is 10 or less.
- the number of annular zones is 10 or less, the influence on flare and ghosts derived from other light due to the processing limit can be minimized.
- FIG. 1 is a diagram illustrating a configuration of an imaging optical system according to Example 1.
- FIG. FIG. 6 is a diagram illustrating aberrations of the imaging optical system according to Example 1.
- 6 is a diagram illustrating a configuration of an imaging optical system according to Embodiment 2.
- FIG. FIG. 10 is a diagram illustrating aberrations of the imaging optical system according to Example 2.
- FIG. 6 is a diagram illustrating a configuration of an imaging optical system according to Example 3.
- FIG. 6 is a diagram illustrating aberrations of the imaging optical system according to Example 3.
- FIG. 6 is a diagram illustrating a configuration of an imaging optical system according to Example 4.
- FIG. 10 is a diagram illustrating aberrations of the imaging optical system according to Example 4.
- FIG. 10 is a diagram illustrating a configuration of an imaging optical system according to Example 5.
- FIG. 10 is a diagram illustrating a configuration of an imaging optical system according to Example 5.
- FIG. 10 is a diagram illustrating a configuration of an imaging optical system according to
- FIG. 1 is a diagram showing a configuration of an imaging optical system according to an embodiment of the present invention.
- the imaging optical system according to the present embodiment includes a first lens 101, a second lens 102, a third lens 103, and a fourth lens 104 from the object side to the image side.
- the stop is located on the object side of the image side surface of the first lens 101 and on the image side of the apex of the object side surface of the first lens 101. Specifically, the stop is on the object side surface of the first lens 101.
- the light that has passed through the first lens 101, the second lens 102, the third lens 103, and the fourth lens 104 passes through the glass plate 105 and reaches the image plane 106.
- the focal length of the i-th lens and the refractive index of the d-line (wavelength 587.6 nm) of the lens material are And the distance from the object side to the image plane (hereinafter also referred to as the optical length) among the combined focal length of the imaging optical system and the apex of the object side surface of the aperture surface or the first lens, respectively, And
- An imaging optical system includes a first lens having a positive power from the object side to the image plane side, a second lens that is a convex meniscus lens on the image side, and a positive power. And a fourth lens having negative power.
- the lens having positive or negative power means that the lens has positive or negative power near its paraxial axis.
- the power in the vicinity of the principal ray in the meridional direction of the third lens is positive in the paraxial region and negative in the position away from the optical axis.
- the power in the vicinity of the chief ray in the meridional direction of the fourth lens is negative in the paraxial region and has a region that is positive at a position away from the optical axis.
- An imaging optical system includes an annular diffraction grating for correcting axial chromatic aberration (hereinafter also referred to as achromatic) on the image side surface of the first lens.
- the number of ring zones is 10 or less. If the number of ring zones is greater than 10, the width of the ring zone at the peripheral edge portion becomes small, and the influence on flare and ghosts derived from other light due to the processing limit increases.
- the absolute value of the ratio between the focal length of the second lens and the combined focal length satisfies the following expression.
- the first lens is made of a low-dispersion material when performing achromaticity using the difference in Abbe number (dispersion rate) of the lens material.
- the lens has a positive power
- the second lens is a lens having a negative power made of a highly dispersed material. In this case, in order to realize a predetermined achromatic performance, the negative power of the second lens needs to be greater than or equal to a predetermined magnitude.
- the design resolution can be sufficiently improved.
- the processing tolerance or assembly tolerance of the lens in the manufacturing process becomes strict, which makes it difficult to manufacture or increases the manufacturing cost.
- the present invention realizes an imaging optical system in which the negative power of the second lens is reduced so as to satisfy Expression (1) while maintaining high resolution.
- the negative power of the second lens is reduced by providing the main achromatic function to the diffraction grating.
- the imaging optical system according to the embodiment of the present invention satisfies the following expression. If the optical length and the combined focal length exceed the upper limit value of Expression (2), it becomes difficult to realize a compact imaging optical system.
- the imaging optical system according to the embodiment of the present invention satisfies the following expression.
- the Petzval sum P expressed by the following equation close to zero.
- Equation (3) since the first and third lenses have positive power and the absolute value of the power of the second lens is small, only the fourth lens has a substantial negative power. Therefore, in order to bring the Petzval sum of Equation (4) closer to 0, Equation (3) needs to be satisfied.
- An imaging optical system characteristic table 1 is a table showing the characteristics of the first to sixth embodiments.
- the unit of length is millimeters unless otherwise specified.
- Examples 1 to 6 satisfy Expressions (1) to (3). Further, the number of ring zones of the diffraction grating provided on the image plane side of the first lens is 10 or less.
- each lens of the embodiment can be expressed by the following expression.
- z is a coordinate indicating the position of the point on the lens surface in the optical axis direction, with the image side being positive with the intersection of the lens surface and the optical axis as a reference.
- r represents the distance from the optical axis of a point on the lens surface.
- R is the radius of curvature at the apex of the lens surface.
- k is a conic constant.
- Ai is a polynomial coefficient.
- phase function of the diffraction grating provided on the image plane side of the first lens can be expressed by the following equation.
- Bi is a coefficient of a polynomial.
- FIG. 1 is a diagram illustrating a configuration of an imaging optical system according to the first embodiment.
- the imaging optical system according to the first embodiment includes a first lens 101, a second lens 102, a third lens 103, and a fourth lens 104 from the object side to the image side.
- the stop is located on the object side of the image side surface of the first lens 101 and on the image side of the apex of the object side surface of the first lens 101. Specifically, the stop is on the object side surface of the first lens 101.
- the light that has passed through the first lens 101, the second lens 102, the third lens 103, and the fourth lens 104 passes through the glass plate 105 and reaches the image plane 106.
- an achromatic diffraction grating is provided on the image plane side of the first lens.
- the main part of the achromatic function is carried by the diffraction grating, and the number of ring zones of the diffraction grating is ten.
- FIG. 2 is a diagram showing aberrations of the imaging optical system according to Example 1.
- FIG. 2 shows aberrations for three wavelengths in the visible region.
- FIG. 2A is a diagram showing spherical aberration and axial chromatic aberration.
- the horizontal axis in FIG. 2A indicates the focal position in the optical axis direction with the image plane position as a reference (unit: millimeter).
- the vertical axis in FIG. 2 (a) indicates the light passage position at the stop. 0 on the vertical axis indicates that the light beam passes through the center of the stop, and the maximum value on the vertical axis indicates that the light beam passes through the end of the stop.
- FIG. 2B is a diagram showing astigmatism and curvature of field.
- the horizontal axis of FIG.2 (b) shows the focus position of an optical axis direction (a unit is a millimeter).
- shaft of FIG.2 (b) shows a visual field. 0 on the vertical axis indicates a viewing angle of 0 °, and the maximum value on the vertical axis indicates the maximum viewing angle.
- T represents the shape of the meridional image plane
- S represents the shape of the sagittal image plane.
- FIG. 2C is a diagram showing distortion.
- the horizontal axis of FIG.2 (c) shows a distortion aberration (a unit is a percentage).
- shaft of FIG.2 (c) shows a visual field. 0 on the vertical axis indicates a viewing angle of 0 °, and the maximum value on the vertical axis indicates the maximum viewing angle.
- Table 2 is a table showing lens data of the imaging optical system according to Example 1.
- or 8th surface shows the surface of the 1st thru
- or 10th surface shows the surface of a glass plate.
- the surface interval of the first surface is the interval between the first surface and the second surface (the image side surface of the first lens).
- Table 3 is a table showing the radius of curvature R and the conic constant k at the apex of the expression (5) of the first to eighth lens surfaces.
- Table 4 is a table showing the coefficient Ai of the polynomial in Expression (5) of the lens surfaces of the first surface to the fourth surface.
- Table 5 is a table showing the coefficient Ai of the polynomial in Expression (5) of the lens surfaces of the fifth surface to the eighth surface.
- Table 6 is a table showing the coefficient Bi of the polynomial in Expression (6) representing the phase function of the diffraction grating.
- FIG. 3 is a diagram illustrating a configuration of the imaging optical system according to the second embodiment.
- the imaging optical system according to Example 2 includes a first lens 201, a second lens 202, a third lens 203, and a fourth lens 204 from the object side to the image side.
- the stop is located on the object side of the image side surface of the first lens 201 and on the image side of the apex of the object side surface of the first lens 201. Specifically, the stop is on the object side surface of the first lens 201.
- the light that has passed through the first lens 201, the second lens 202, the third lens 203, and the fourth lens 204 passes through the glass plate 205 and reaches the image plane 206.
- an achromatic diffraction grating is provided on the image plane side of the first lens.
- the main part of the achromatic function is carried by the diffraction grating, and the number of ring zones of the diffraction grating is nine.
- FIG. 4 is a diagram showing aberrations of the imaging optical system according to Example 2.
- FIG. 4 shows aberrations for three wavelengths in the visible region.
- FIG. 4A is a diagram showing spherical aberration and axial chromatic aberration.
- the horizontal axis in FIG. 4A indicates the focal position in the optical axis direction with the image plane position as a reference (unit: millimeter).
- the vertical axis in FIG. 4 (a) indicates the light passage position at the stop. 0 on the vertical axis indicates that the light beam passes through the center of the stop, and the maximum value on the vertical axis indicates that the light beam passes through the end of the stop.
- FIG. 4B is a diagram showing astigmatism and field curvature.
- the horizontal axis of FIG.4 (b) shows the focus position of an optical axis direction (a unit is a millimeter).
- shaft of FIG.4 (b) shows a visual field. 0 on the vertical axis indicates a viewing angle of 0 °, and the maximum value on the vertical axis indicates the maximum viewing angle.
- T represents the shape of the meridional image plane
- S represents the shape of the sagittal image plane.
- FIG. 4C is a diagram showing distortion.
- the horizontal axis of FIG.4 (c) shows a distortion aberration (distortion) (a unit is a percentage).
- shaft of FIG.4 (c) shows a visual field. 0 on the vertical axis indicates a viewing angle of 0 °, and the maximum value on the vertical axis indicates the maximum viewing angle.
- Table 7 is a table showing lens data of the imaging optical system according to Example 2.
- or 8th surface shows the surface of the 1st thru
- the surface interval of the first surface is the interval between the first surface and the second surface (the image side surface of the first lens).
- Table 8 is a table showing the radius of curvature R and the conic constant k at the apex of the expression (5) of the first to eighth lens surfaces.
- Table 9 is a table showing the coefficient Ai of the polynomial in Expression (5) of the lens surfaces of the first surface to the fourth surface.
- Table 10 is a table showing the coefficient Ai of the polynomial in Expression (5) of the lens surfaces of the fifth surface to the eighth surface.
- Table 11 is a table showing the coefficient Bi of the polynomial in Expression (6) representing the phase function of the diffraction grating.
- FIG. 5 is a diagram illustrating a configuration of the imaging optical system according to the third embodiment.
- the imaging optical system according to Example 3 includes a first lens 301, a second lens 302, a third lens 303, and a fourth lens 304 from the object side to the image side.
- the stop is located closer to the object side than the image side surface of the first lens 301 and closer to the image side than the vertex of the object side surface of the first lens 301. Specifically, the stop is on the object side surface of the first lens 301.
- the light that has passed through the first lens 301, the second lens 302, the third lens 303, and the fourth lens 304 passes through the glass plate 305 and reaches the image plane 306.
- an achromatic diffraction grating is provided on the image plane side of the first lens.
- the main part of the achromatic function is carried by the diffraction grating, and the number of ring zones of the diffraction grating is ten.
- FIG. 6 is a diagram showing aberrations of the imaging optical system according to Example 3.
- FIG. 6 shows aberrations for three wavelengths in the visible region.
- FIG. 6A is a diagram showing spherical aberration and axial chromatic aberration.
- the horizontal axis in FIG. 6A indicates the focal position in the optical axis direction with the image plane position as a reference (unit: millimeter).
- the vertical axis in FIG. 6 (a) indicates the light passage position at the stop. 0 on the vertical axis indicates that the light beam passes through the center of the stop, and the maximum value on the vertical axis indicates that the light beam passes through the end of the stop.
- FIG. 6B is a diagram showing astigmatism and field curvature.
- the horizontal axis of FIG.6 (b) shows the focus position of an optical axis direction (a unit is a millimeter).
- shaft of FIG.6 (b) shows a visual field. 0 on the vertical axis indicates a viewing angle of 0 °, and the maximum value on the vertical axis indicates the maximum viewing angle.
- T represents the shape of the meridional image plane
- S represents the shape of the sagittal image plane.
- FIG. 6C is a diagram showing distortion.
- the horizontal axis of FIG.6 (c) shows a distortion aberration (distortion) (a unit is a percentage).
- shaft of FIG.6 (c) shows a visual field. 0 on the vertical axis indicates a viewing angle of 0 °, and the maximum value on the vertical axis indicates the maximum viewing angle.
- Table 12 is a table showing lens data of the imaging optical system according to Example 3.
- or 8th surface shows the surface of the 1st thru
- the surface interval of the first surface is the interval between the first surface and the second surface (the image side surface of the first lens).
- Table 13 is a table showing the radius of curvature R and the conic constant k at the apex of the expression (5) of the first to eighth lens surfaces.
- Table 14 is a table showing the coefficient Ai of the polynomial in Expression (5) for the first to fourth lens surfaces.
- Table 15 is a table showing the coefficient Ai of the polynomial in Expression (5) of the lens surfaces of the fifth surface to the eighth surface.
- Table 16 is a table showing the coefficient Bi of the polynomial in Expression (6) representing the phase function of the diffraction grating.
- FIG. 7 is a diagram illustrating a configuration of the imaging optical system according to the fourth embodiment.
- the imaging optical system according to Example 4 includes a first lens 401, a second lens 402, a third lens 403, and a fourth lens 404 from the object side to the image side.
- the stop is located on the object side of the image side surface of the first lens 401 and on the image side of the apex of the object side surface of the first lens 401. Specifically, the stop is on the object side surface of the first lens 401.
- the light that has passed through the first lens 401, the second lens 402, the third lens 403, and the fourth lens 404 passes through the glass plate 405 and reaches the image plane 406.
- an achromatic diffraction grating is provided on the image plane side of the first lens.
- the main part of the achromatic function is carried by the diffraction grating, and the number of ring zones of the diffraction grating is eight.
- FIG. 8 is a diagram showing aberrations of the imaging optical system according to Example 4.
- FIG. 8 shows aberrations for three wavelengths in the visible region.
- FIG. 8A is a diagram showing spherical aberration and axial chromatic aberration.
- the horizontal axis in FIG. 8A indicates the focal position in the optical axis direction with respect to the image plane position (unit: millimeter).
- shaft of Fig.8 (a) shows the passage position of the light ray in a stop. 0 on the vertical axis indicates that the light beam passes through the center of the stop, and the maximum value on the vertical axis indicates that the light beam passes through the end of the stop.
- FIG. 8B is a diagram showing astigmatism and field curvature.
- the horizontal axis of FIG.8 (b) shows the focus position of an optical axis direction (a unit is a millimeter).
- shaft of FIG.8 (b) shows a visual field. 0 on the vertical axis indicates a viewing angle of 0 °, and the maximum value on the vertical axis indicates the maximum viewing angle.
- T represents the shape of the meridional image plane
- S represents the shape of the sagittal image plane.
- FIG. 8C is a diagram showing distortion.
- the horizontal axis of FIG.8 (c) shows a distortion aberration (distortion) (a unit is a percentage).
- shaft of FIG.8 (c) shows a visual field. 0 on the vertical axis indicates a viewing angle of 0 °, and the maximum value on the vertical axis indicates the maximum viewing angle.
- Table 17 is a table showing lens data of the imaging optical system according to Example 4.
- or 8th surface shows the surface of the 1st thru
- the surface interval of the first surface is the interval between the first surface and the second surface (the image side surface of the first lens).
- Table 18 is a table showing the radius of curvature R and the conic constant k at the apex of the expression (5) of the first to eighth lens surfaces.
- Table 19 is a table showing the coefficient Ai of the polynomial in Expression (5) for the first to fourth lens surfaces.
- Table 20 is a table showing the coefficient Ai of the polynomial in Expression (5) of the lens surfaces of the fifth surface to the eighth surface.
- Table 21 is a table showing the coefficient Bi of the polynomial in Expression (6) representing the phase function of the diffraction grating.
- FIG. 9 is a diagram illustrating a configuration of the imaging optical system according to the fifth embodiment.
- the imaging optical system according to Example 5 includes a first lens 501, a second lens 502, a third lens 503, and a fourth lens 504 from the object side to the image side.
- the stop is located on the object side of the image side surface of the first lens 501 and on the image side of the apex of the object side surface of the first lens 501. Specifically, the stop is on the object side surface of the first lens 501.
- the light that has passed through the first lens 501, the second lens 502, the third lens 503, and the fourth lens 504 passes through the glass plate 505 and reaches the image plane 506.
- an achromatic diffraction grating is provided on the image plane side of the first lens.
- the main part of the achromatic function is carried by the diffraction grating, and the number of ring zones of the diffraction grating is five.
- FIG. 10 is a diagram showing aberrations of the imaging optical system according to Example 5.
- FIG. 10 shows aberrations for three wavelengths in the visible region.
- FIG. 10A is a diagram showing spherical aberration and axial chromatic aberration.
- the horizontal axis in FIG. 10A indicates the focal position in the optical axis direction with the image plane position as a reference (unit: millimeter).
- shaft of Fig.10 (a) shows the passage position of the light beam in an aperture_diaphragm
- FIG. 10B is a diagram showing astigmatism and field curvature.
- the horizontal axis of FIG.10 (b) shows the focus position of an optical axis direction (a unit is a millimeter).
- shaft of FIG.10 (b) shows a visual field. 0 on the vertical axis indicates a viewing angle of 0 °, and the maximum value on the vertical axis indicates the maximum viewing angle.
- T represents the shape of the meridional image plane
- S represents the shape of the sagittal image plane.
- FIG.10 (c) is a figure which shows a distortion aberration.
- the horizontal axis of FIG.10 (c) shows a distortion aberration (distortion) (a unit is a percentage).
- shaft of FIG.10 (c) shows a visual field. 0 on the vertical axis indicates a viewing angle of 0 °, and the maximum value on the vertical axis indicates the maximum viewing angle.
- Table 22 is a table showing lens data of the imaging optical system according to Example 5.
- or 8th surface shows the surface of the 1st thru
- or 10th surface shows the surface of a glass plate.
- the surface interval of the first surface is the interval between the first surface and the second surface (the image side surface of the first lens).
- Table 23 is a table showing the radius of curvature R and the conic constant k at the apex of the expression (5) of the first to eighth lens surfaces.
- Table 24 is a table showing the coefficient Ai of the polynomial in Expression (5) for the first to fourth lens surfaces.
- Table 25 is a table showing the coefficient Ai of the polynomial in Expression (5) of the lens surfaces of the fifth surface to the eighth surface.
- Table 26 is a table showing the coefficient Bi of the polynomial in Expression (6) that represents the phase function of the diffraction grating.
- FIG. 11 is a diagram illustrating a configuration of the imaging optical system according to the sixth embodiment.
- the imaging optical system according to Example 6 includes a first lens 601, a second lens 602, a third lens 603, and a fourth lens 604 from the object side to the image side.
- the stop is located on the object side of the image side surface of the first lens 601 and on the image side of the apex of the object side surface of the first lens 601. Specifically, the stop is on the object side surface of the first lens 601.
- the light that has passed through the first lens 601, the second lens 602, the third lens 603, and the fourth lens 604 passes through the glass plate 605 and reaches the image plane 606.
- an achromatic diffraction grating is provided on the image plane side of the first lens.
- the main part of the achromatic function is carried by the diffraction grating, and the number of ring zones of the diffraction grating is nine.
- FIG. 12 is a diagram showing aberrations of the imaging optical system according to Example 6.
- FIG. 12 shows aberrations for three wavelengths in the visible region.
- FIG. 12A is a diagram showing spherical aberration and axial chromatic aberration.
- the horizontal axis in FIG. 12A indicates the focal position in the optical axis direction with respect to the image plane position (unit: millimeter).
- shaft of Fig.12 (a) shows the passage position of the light ray in a stop. 0 on the vertical axis indicates that the light beam passes through the center of the stop, and the maximum value on the vertical axis indicates that the light beam passes through the end of the stop.
- FIG. 12B is a diagram showing astigmatism and curvature of field.
- the horizontal axis of FIG.12 (b) shows the focus position of an optical axis direction (a unit is a millimeter).
- shaft of FIG.12 (b) shows a visual field. 0 on the vertical axis indicates a viewing angle of 0 °, and the maximum value on the vertical axis indicates the maximum viewing angle.
- T represents the shape of the meridional image plane
- S represents the shape of the sagittal image plane.
- FIG. 12C is a diagram showing distortion.
- the horizontal axis of FIG.12 (c) shows a distortion aberration (distortion) (a unit is a percentage).
- shaft of FIG.12 (c) shows a visual field. 0 on the vertical axis indicates a viewing angle of 0 °, and the maximum value on the vertical axis indicates the maximum viewing angle.
- Table 27 is a table showing lens data of the imaging optical system according to Example 6.
- or 8th surface shows the surface of the 1st thru
- the surface interval of the first surface is the interval between the first surface and the second surface (the image side surface of the first lens).
- Table 28 is a table showing the radius of curvature R and the conic constant k at the apex of the expression (5) of the first to eighth lens surfaces.
- Table 29 is a table showing the coefficient Ai of the polynomial in Expression (5) for the first to fourth lens surfaces.
- Table 30 is a table showing the coefficient Ai of the polynomial in Expression (5) of the lens surfaces of the fifth surface to the eighth surface.
- Table 31 is a table showing the coefficient Bi of the polynomial in Expression (6) representing the phase function of the diffraction grating.
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Abstract
Description
特許文献2 特許4032667号公報
特許文献3 特許4032668号公報
本発明の実施形態による結像光学系は、物体側から像面側に、正のパワーを有する第1レンズ、像側に凸のメニスカスレンズである第2レンズ、正のパワーを有する第3レンズ及び負のパワーを有する第4レンズを備える。ここで、レンズが正または負のパワーを有するとは、レンズがその近軸付近で正または負のパワーを有することを言う。
本発明の実施形態による結像光学系は、第1レンズの像側面に、軸上色収差の修正(以下、色消しとも呼称する)のための輪帯回折格子を備える。輪帯数は10以下である。輪帯数が10より大きいと、周縁部の輪帯の幅が小さくなり、加工限界による他次光由来のフレアやゴーストへの影響が大きくなる。
本発明の実施形態による結像光学系は、以下の式を満足する。
実施例の各レンズの面は、以下の式で表せる。
図1は、実施例1による結像光学系の構成を示す図である。実施例1による結像光学系は、物体側から像側に、第1レンズ101、第2レンズ102、第3レンズ103および第4レンズ104を備える。絞りは、第1レンズ101の像側の面より物体側で第1レンズ101の物体側の面の頂点より像側にある。具体的には、絞りは第1レンズ101の物体側の面上にある。第1レンズ101、第2レンズ102、第3レンズ103および第4レンズ104を通過した光は、ガラス板105を通過して像面106に至る。
図3は、実施例2による結像光学系の構成を示す図である。実施例2による結像光学系は、物体側から像側に、第1レンズ201、第2レンズ202、第3レンズ203および第4レンズ204を備える。絞りは、第1レンズ201の像側の面より物体側で第1レンズ201の物体側の面の頂点より像側にある。具体的には、絞りは第1レンズ201の物体側の面上にある。第1レンズ201、第2レンズ202、第3レンズ203および第4レンズ204を通過した光は、ガラス板205を通過して像面206に至る。
図5は、実施例3による結像光学系の構成を示す図である。実施例3による結像光学系は、物体側から像側に、第1レンズ301、第2レンズ302、第3レンズ303および第4レンズ304を備える。絞りは、第1レンズ301の像側の面より物体側で第1レンズ301の物体側の面の頂点より像側にある。具体的には、絞りは第1レンズ301の物体側の面上にある。第1レンズ301、第2レンズ302、第3レンズ303および第4レンズ304を通過した光は、ガラス板305を通過して像面306に至る。
図7は、実施例4による結像光学系の構成を示す図である。実施例4による結像光学系は、物体側から像側に、第1レンズ401、第2レンズ402、第3レンズ403および第4レンズ404を備える。絞りは、第1レンズ401の像側の面より物体側で第1レンズ401の物体側の面の頂点より像側にある。具体的には、絞りは第1レンズ401の物体側の面上にある。第1レンズ401、第2レンズ402、第3レンズ403および第4レンズ404を通過した光は、ガラス板405を通過して像面406に至る。
図9は、実施例5による結像光学系の構成を示す図である。実施例5による結像光学系は、物体側から像側に、第1レンズ501、第2レンズ502、第3レンズ503および第4レンズ504を備える。絞りは、第1レンズ501の像側の面より物体側で第1レンズ501の物体側の面の頂点より像側にある。具体的には、絞りは第1レンズ501の物体側の面上にある。第1レンズ501、第2レンズ502、第3レンズ503および第4レンズ504を通過した光は、ガラス板505を通過して像面506に至る。
図11は、実施例6による結像光学系の構成を示す図である。実施例6による結像光学系は、物体側から像側に、第1レンズ601、第2レンズ602、第3レンズ603および第4レンズ604を備える。絞りは、第1レンズ601の像側の面より物体側で第1レンズ601の物体側の面の頂点より像側にある。具体的には、絞りは第1レンズ601の物体側の面上にある。第1レンズ601、第2レンズ602、第3レンズ603および第4レンズ604を通過した光は、ガラス板605を通過して像面606に至る。
Claims (3)
- 物体側から像面側に、正のパワーを有する第1レンズ、像側に凸のメニスカスレンズである第2レンズ、正のパワーを有する第3レンズ及び負のパワーを有する第4レンズを備えた結像光学系であって、第3レンズのメリディオナル方向における主光線の近傍のパワーは、近軸領域で正であり、光軸から離れた位置で負となる領域を有し、第4レンズのメリディオナル方向における主光線の近傍のパワーは、近軸領域で負であり、光軸から離れた位置で正となる領域を有し、第1レンズは、像側面に回折格子を備え、第2レンズの焦点距離をf2、結像光学系の合成焦点距離をfT、絞り面または第1レンズの物体側面の頂点のうち、物体側のものから像面までの距離をTTLとして、
- 前記回折格子が輪帯からなり、輪帯数が10以下である請求項1または2に記載の結像光学系。
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JP2010128258A JP4798529B2 (ja) | 2009-07-08 | 2010-06-03 | 結像光学系 |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012145789A (ja) * | 2011-01-13 | 2012-08-02 | Nikon Corp | 光学系、光学機器、および回折光学素子の配置方法 |
JP2013250330A (ja) * | 2012-05-30 | 2013-12-12 | Kantatsu Co Ltd | 撮像レンズ |
JP2014044399A (ja) * | 2012-07-31 | 2014-03-13 | Kantatsu Co Ltd | 撮像レンズ |
KR20190079592A (ko) * | 2019-06-25 | 2019-07-05 | 엘지이노텍 주식회사 | 광학계 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011004443A1 (ja) * | 2009-07-08 | 2011-01-13 | ナルックス株式会社 | 結像光学系 |
JP2013005091A (ja) * | 2011-06-14 | 2013-01-07 | Pentax Ricoh Imaging Co Ltd | 撮像装置および距離情報取得方法 |
CN103185958B (zh) * | 2012-12-28 | 2015-05-20 | 玉晶光电(厦门)有限公司 | 可携式电子装置与其光学成像镜头 |
CN105629435A (zh) * | 2014-11-28 | 2016-06-01 | 鸿富锦精密工业(深圳)有限公司 | 成像镜头 |
CN105137571B (zh) * | 2015-08-12 | 2017-07-28 | 北京天诚盛业科技有限公司 | 成像镜头、虹膜成像模组以及双目虹膜识别装置 |
CN110412734B (zh) * | 2019-06-29 | 2021-09-17 | 瑞声光学解决方案私人有限公司 | 摄像光学镜头 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004341512A (ja) * | 2003-04-23 | 2004-12-02 | Olympus Corp | 結像光学系及びそれを用いた電子機器 |
JP2007017984A (ja) * | 2005-07-07 | 2007-01-25 | Samsung Electronics Co Ltd | 撮像用光学系 |
JP2007127953A (ja) * | 2005-11-07 | 2007-05-24 | Konica Minolta Opto Inc | 撮像光学系、撮像レンズ装置及びデジタル機器 |
JP2007193195A (ja) * | 2006-01-20 | 2007-08-02 | Canon Electronics Inc | 撮影レンズ及びそれを有する撮像装置 |
JP2008033376A (ja) * | 2003-11-13 | 2008-02-14 | Konica Minolta Opto Inc | 撮像レンズ及び撮像装置 |
JP2008185807A (ja) * | 2007-01-30 | 2008-08-14 | Fujinon Corp | 撮像レンズ |
JP2009003443A (ja) * | 2007-05-22 | 2009-01-08 | Enplas Corp | 撮像レンズ |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1075150A3 (en) * | 1999-07-31 | 2005-04-27 | Lg Electronics Inc. | Projection lens system |
US6950246B2 (en) * | 2003-04-23 | 2005-09-27 | Olympus Corporation | Imaging optical system and apparatus using the same |
WO2011004443A1 (ja) * | 2009-07-08 | 2011-01-13 | ナルックス株式会社 | 結像光学系 |
-
2009
- 2009-12-24 WO PCT/JP2009/007194 patent/WO2011004443A1/ja active Application Filing
- 2009-12-24 CN CN2009800005873A patent/CN102016682A/zh not_active Withdrawn
- 2009-12-24 JP JP2010504367A patent/JPWO2011004443A1/ja active Pending
-
2010
- 2010-07-07 CN CN2010102248342A patent/CN101950064B/zh active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004341512A (ja) * | 2003-04-23 | 2004-12-02 | Olympus Corp | 結像光学系及びそれを用いた電子機器 |
JP2008033376A (ja) * | 2003-11-13 | 2008-02-14 | Konica Minolta Opto Inc | 撮像レンズ及び撮像装置 |
JP2007017984A (ja) * | 2005-07-07 | 2007-01-25 | Samsung Electronics Co Ltd | 撮像用光学系 |
JP2007127953A (ja) * | 2005-11-07 | 2007-05-24 | Konica Minolta Opto Inc | 撮像光学系、撮像レンズ装置及びデジタル機器 |
JP2007193195A (ja) * | 2006-01-20 | 2007-08-02 | Canon Electronics Inc | 撮影レンズ及びそれを有する撮像装置 |
JP2008185807A (ja) * | 2007-01-30 | 2008-08-14 | Fujinon Corp | 撮像レンズ |
JP2009003443A (ja) * | 2007-05-22 | 2009-01-08 | Enplas Corp | 撮像レンズ |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012145789A (ja) * | 2011-01-13 | 2012-08-02 | Nikon Corp | 光学系、光学機器、および回折光学素子の配置方法 |
US8988792B2 (en) | 2011-01-13 | 2015-03-24 | Nikon Corporation | Optical system, optical apparatus and method for arranging diffractive optical element |
JP2013250330A (ja) * | 2012-05-30 | 2013-12-12 | Kantatsu Co Ltd | 撮像レンズ |
US9341857B2 (en) | 2012-05-30 | 2016-05-17 | Kantatsu Co., Ltd. | Imaging lens comprising a diffractive optical surface |
JP2014044399A (ja) * | 2012-07-31 | 2014-03-13 | Kantatsu Co Ltd | 撮像レンズ |
KR20190079592A (ko) * | 2019-06-25 | 2019-07-05 | 엘지이노텍 주식회사 | 광학계 |
KR102116801B1 (ko) | 2019-06-25 | 2020-06-01 | 엘지이노텍 주식회사 | 광학계 |
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