WO2013118479A1 - 撮像レンズおよび撮像装置 - Google Patents
撮像レンズおよび撮像装置 Download PDFInfo
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- WO2013118479A1 WO2013118479A1 PCT/JP2013/000572 JP2013000572W WO2013118479A1 WO 2013118479 A1 WO2013118479 A1 WO 2013118479A1 JP 2013000572 W JP2013000572 W JP 2013000572W WO 2013118479 A1 WO2013118479 A1 WO 2013118479A1
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- lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
- G02B15/1431—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being positive
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/02—Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length
Definitions
- the present invention relates to an imaging lens and an imaging apparatus, and more particularly to an imaging lens used in an electronic camera such as a digital camera, a broadcast camera, and a movie shooting camera, and an imaging apparatus including the imaging lens.
- Patent Document 1 FNo. An imaging lens of 1.4 is proposed.
- Patent Document 2 proposes a focusing lens that is focused on the rear focus to reduce the weight of the focus lens.
- a movie shooting lens is required to have a high performance up to an open aperture, but the imaging lens disclosed in Patent Document 1 is FNo.
- the imaging lens disclosed in Patent Document 1 is FNo.
- the sagittal coma flare remains at the wide aperture and the focusing weight is heavy because the entire payout focusing is performed.
- Patent Document 2 The imaging lens disclosed in Patent Document 2 is lightweight because focusing is performed with a single cemented lens. However, there was a drawback that it was dark as 2.8.
- the present invention was made in view of the above circumstances, and the focusing group is lightweight, and FNo.
- An object of the present invention is to provide an imaging lens having a small size and high performance, and an imaging apparatus including the imaging lens.
- the imaging lens of the present invention includes, in order from the object side, a first lens group having a positive refractive power that is fixed during focusing, a second lens group having a positive refractive power that moves during focusing, and a third lens group that is fixed during focusing.
- the first lens group includes, in order from the object side, a first-a lens group having a positive refractive power, a stop, and a first-b lens group having a positive refractive power.
- the first-a lens group is disposed on the object side.
- a positive lens 1a1 having a convex surface with a small absolute value of curvature radius, a negative meniscus lens 1a2 having a convex surface facing the object side, a negative meniscus lens 1a3 having a convex surface facing the object side, and a positive lens having a convex surface facing the object side Meniscus lens 1a4, negative lens 1a5 with a concave surface having a small absolute value of curvature radius on the image side, positive lens 1a6, negative lens 1a7, and cemented lens of positive lens 1a8 and negative lens 1a9 Characterized in that it consists's.
- f is the focal length of the entire system when focusing on an object at infinity
- f2 is the focal length of the second lens group
- the second lens group is preferably a positive lens having a convex surface with a small absolute value of the radius of curvature facing the object side.
- the 1b lens group includes a cemented lens of the positive lens 1b1 and the negative lens 1b2.
- the third lens group includes, in order from the object side, a negative lens 31 having a surface with a small radius of curvature directed toward the image side, and a positive lens 32 having a surface with a small radius of curvature directed toward the object side. It is preferable.
- ⁇ 1a8 is the Abbe number of the positive lens 1a8 and ⁇ 1a9 is the Abbe number of the negative lens 1a9.
- An image pickup apparatus of the present invention includes the above-described image pickup lens of the present invention.
- the imaging lens of the present invention includes, in order from the object side, a first lens group having a positive refractive power that is fixed during focusing, a second lens group having a positive refractive power that moves during focusing, and a third lens group that is fixed during focusing.
- the first lens group includes, in order from the object side, a first-a lens group having a positive refractive power, a stop, and a first-b lens group having a positive refractive power.
- the first-a lens group is disposed on the object side.
- a positive lens 1a1 having a convex surface with a small absolute value of curvature radius, a negative meniscus lens 1a2 having a convex surface facing the object side, a negative meniscus lens 1a3 having a convex surface facing the object side, and a positive lens having a convex surface facing the object side Meniscus lens 1a4, negative lens 1a5 with a concave surface having a small absolute value of curvature radius on the image side, positive lens 1a6, negative lens 1a7, and cemented lens of positive lens 1a8 and negative lens 1a9 Since consisted of drawing, together with the focusing lens unit (second lens unit) can be lighter, FNo. It is possible to realize a small and high performance imaging lens.
- the imaging apparatus of the present invention includes the imaging lens of the present invention, it is possible to perform focusing at high speed and obtain a brighter and higher quality image.
- Sectional drawing which shows the lens structure of the imaging lens (common with Example 1) concerning one Embodiment of this invention.
- Sectional drawing which shows the lens structure of the imaging lens of Example 2 of this invention.
- Sectional drawing which shows the lens structure of the imaging lens of Example 3 of this invention.
- Aberration diagrams (AE) of the imaging lens of Example 1 of the present invention Lateral aberration diagram of the imaging lens of Example 1 of the present invention
- Lateral aberration diagram of the imaging lens of Example 2 of the present invention
- Lateral aberration diagram of the imaging lens of Example 3 of the present invention is a schematic configuration diagram of an imaging apparatus according to an embodiment of the present invention.
- FIG. 1 is a cross-sectional view showing a lens configuration of an imaging lens (common to Example 1) according to an embodiment of the present invention.
- the configuration example shown in FIG. 1 is the same as the configuration of the imaging lens of Example 1 described later.
- the left side is the object side
- the right side is the image side.
- This imaging lens has a positive refractive power that is fixed at the time of focusing and has positive refractive power along the optical axis Z in order from the object side.
- the first lens group G1 including the aperture stop St has a positive refractive power that moves at the time of focusing.
- the second lens group G2 includes a third lens group G3 that is fixed during focusing. Note that the aperture stop St shown in FIG. 1 does not necessarily indicate the size or shape, but indicates the position on the optical axis Z.
- the first lens group G1 has positive refractive power in this way, the height of the on-axis marginal ray to the second lens group G2 can be suppressed, and therefore the focusing lens group (second lens group G2). It is possible to reduce the weight by suppressing the diameter.
- FIG. 1 shows an example in which a parallel plate-like optical member PP that assumes these is arranged between the third lens group G3 and the image plane Sim.
- the first lens group G1 includes, in order from the object side, a first-a lens group G1a having a positive refractive power, an aperture stop St, and a first-b lens group G1b having a positive refractive power.
- the 1a lens group G1a includes a positive lens L1a1 having a convex surface with a small absolute value of curvature radius on the object side, a negative meniscus lens L1a2 having a convex surface on the object side, and a negative meniscus having a convex surface on the object side.
- Lens L1a3, positive meniscus lens L1a4 having a convex surface facing the object side, negative lens L1a5 having a concave surface having a small absolute value of curvature radius toward the image side, positive lens L1a6, negative lens L1a7, positive lens L1a8 and negative lens L1a9 It consists of a cemented lens. By adopting such a configuration, spherical aberration, coma and astigmatism can be suppressed.
- the 1b lens group G1b includes a cemented lens of a positive lens L1b1 and a negative lens L1b2. With such a configuration, axial chromatic aberration and magnification chromatic aberration can be corrected.
- the second lens group G2 is composed of a positive lens L2 having a convex surface with a small absolute value of the radius of curvature facing the object side.
- the third lens group G3 includes, in order from the object side, a negative lens L31 having a surface with a small radius of curvature facing the image side, and a positive lens L32 having a surface with a small radius of curvature facing the object side. Become.
- the imaging lens according to the embodiment of the present invention is configured to satisfy the following conditional expression (1). If the following conditional expression (1) ′ is satisfied, a higher-performance imaging lens can be obtained.
- f is the focal length of the entire system when focusing on an object at infinity
- f2 is the focal length of the second lens group
- conditional expression (1) If the lower limit of conditional expression (1) is not reached, the amount of focusing movement becomes too large, and if the upper limit is exceeded, fluctuations in spherical aberration due to focusing will increase.
- the imaging lens according to the embodiment of the present invention is configured to satisfy the following conditional expressions (2) and (3).
- ⁇ 1a8 is the Abbe number of the positive lens 1a8 and ⁇ 1a9 is the Abbe number of the negative lens 1a9.
- conditional expression (2) If the lower limit of conditional expression (2) is not reached, it is difficult to correct axial chromatic aberration. If the lower limit of conditional expression (3) is not reached, it will be difficult to correct secondary chromatic aberration, and if it exceeds the upper limit, it will be difficult to correct axial chromatic aberration.
- the imaging lens according to the embodiment of the present invention is configured to satisfy the following conditional expression (4). If the following conditional expression (4) 'is satisfied, a higher-performance imaging lens can be obtained.
- conditional expression (4) If the lower limit of the conditional expression (4) is not reached, the tilt angle of the principal ray incident on the second lens group G2 increases, and the angle of view variation due to focusing increases.
- the upper limit of conditional expression (4) is exceeded, the height of the principal ray incident on the second lens group G2 increases, and the angle of view variation due to focusing also increases.
- the material disposed closest to the object side specifically, glass is preferably used, or transparent ceramics may be used.
- a protective multilayer coating is preferably applied.
- an antireflection coat for reducing ghost light during use may be applied.
- optical member PP is arranged between the lens system and the image plane Sim, but instead of arranging a low-pass filter, various filters that cut a specific wavelength range, and the like.
- these various filters may be arranged between the lenses, or a coating having the same action as the various filters may be applied to the lens surface of any lens.
- FIG. 1 is a sectional view showing the lens configuration of the imaging lens of Example 1
- FIG. 2 is a sectional view showing the lens configuration of the imaging lens of Example 2
- FIG. 2 is a sectional view showing the lens configuration of the imaging lens of Example 3.
- the optical member PP is also shown together, the left side is the object side, the right side is the image side, and the illustrated aperture stop St does not necessarily represent the size or shape.
- the position on the optical axis Z is shown.
- Table 1 shows basic lens data of the imaging lens of Example 1, and Table 2 shows data related to specifications.
- Table 3 shows basic lens data of the imaging lens of Example 2, and Table 4 shows data related to specifications.
- Table 5 shows basic lens data of the imaging lens of Example 3, and Table 6 shows data related to specifications.
- the Ri column shows the radius of curvature of the i-th surface
- the Di column shows the surface spacing on the optical axis Z between the i-th surface and the i + 1-th surface.
- the Ndi column shows the refractive index for the d-line (wavelength 587.6 nm) of the medium between the i-th surface and the (i + 1) -th surface, and the most object side optical element is the first in the ⁇ dj column.
- the sign of the radius of curvature is positive when the surface shape is convex on the object side and negative when the surface shape is convex on the image side.
- the basic lens data includes the aperture stop St, the optical member PP, and the image plane.
- the phrase (aperture) is written together with the surface number.
- the surface number column of the surface corresponding to the image surface together with the surface number (image surface ).
- the data on the specifications in Table 2 include focal length f ', F number Fno. And the value of the total angle of view 2 ⁇ .
- Table 7 shows values corresponding to conditional expressions (1) to (4) of the imaging lenses of Examples 1 to 3.
- the d-line is used as the reference wavelength, and the values shown in Table 7 below are at this reference wavelength.
- FIGS. 4A to 4E show aberration diagrams of the imaging lens of Example 1.
- FIG. 4A to 4E show spherical aberration, sine condition violation amount, astigmatism, distortion aberration, and lateral chromatic aberration, respectively.
- Each aberration diagram representing spherical aberration, astigmatism, and distortion shows aberrations with the d-line (wavelength 587.6 nm) as the reference wavelength.
- the aberrations for the d-line (wavelength 587.6 nm), C-line (wavelength 656.3 nm), F-line (wavelength 486.1 nm), and g-line (wavelength 435.8 nm) are shown as solid lines. , Long broken line, short broken line, gray line.
- the sagittal and tangential aberrations are indicated by a solid line and a broken line, respectively.
- Fno Of spherical aberration diagram. Means F number, and ⁇ in other aberration diagrams means half angle of view.
- FIG. 1 a lateral aberration diagram of the imaging lens of Example 1 is shown in FIG.
- the aberrations for the d-line (wavelength 587.6 nm), C-line (wavelength 656.3 nm), and F-line (wavelength 486.1 nm) are shown by a solid line, a short broken line, and a long broken line, respectively.
- FIGS. 6A to 6E aberration diagrams of the imaging lens of Example 2 are shown in FIGS. 6A to 6E, and lateral aberration diagrams are shown in FIG.
- FIGS. 8A to 8E aberration diagrams of the imaging lens of Example 3 are shown in FIGS. 8A to 8E, and lateral aberration diagrams are shown in FIG.
- FIG. 10 shows a schematic configuration diagram of an imaging apparatus using the imaging lens of the embodiment of the present invention as an example of the imaging apparatus of the embodiment of the present invention.
- the imaging device include a video camera and an electronic still camera that use a solid-state imaging device such as a CCD or CMOS as a recording medium.
- An imaging apparatus 10 illustrated in FIG. 10 includes an imaging lens 1, a filter 2 disposed on the image side of the imaging lens 1, an imaging element 3 that captures an image of a subject formed by the imaging lens, and the imaging element 3.
- a signal processing unit 4 that performs arithmetic processing on the output signal
- a focus control unit 5 for adjusting the focus of the imaging lens 1.
- the imaging lens 1 has a positive refractive power in order from the object side, and includes a first lens group G1 including an aperture stop, a second lens group G2 having a positive refractive power, and a third lens group G3 having a refractive power.
- the second lens group is moved to perform focusing.
- FIG. 10 schematically shows each lens group.
- the image pickup device 3 converts an optical image formed by the image pickup lens 1 into an electric signal, and the image pickup surface thereof is disposed so as to coincide with the image surface of the image pickup lens.
- a CCD or a CMOS can be used as the imaging element 3.
- the present invention has been described with reference to the embodiments and examples. However, the present invention is not limited to the above-described embodiments and examples, and various modifications can be made.
- the values of the radius of curvature, the surface interval, the refractive index, the Abbe number, the aspherical coefficient, etc. of each lens component are not limited to the values shown in the above numerical examples, and can take other values.
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Abstract
Description
ただし、f:無限遠物体に合焦時の全系の焦点距離、f2:前記第2レンズ群の焦点距離とする。
また、第2レンズ群は、物体側に曲率半径の絶対値の小さい凸面を向けた正レンズからなることが好ましい。
40<ν1a9<60 …(3)
ただし、ν1a8:前記正レンズ1a8のアッベ数、ν1a9:前記負レンズ1a9のアッベ数とする。
ただし、D:前記絞りと前記1bレンズの間隔、f:無限遠物体に合焦時の全系の焦点距離とする。
本発明の撮像装置は、上記記載の本発明の撮像レンズを備えたことを特徴とするものである。
0.25<f/f2<0.40 …(1)’
ただし、f:無限遠物体に合焦時の全系の焦点距離、f2:前記第2レンズ群の焦点距離とする。
40<ν1a9<60 …(3)
ただし、ν1a8:前記正レンズ1a8のアッベ数、ν1a9:前記負レンズ1a9のアッベ数とする。
0.30<D/f<0.50 …(4)’
ただし、D:前記絞りと前記1bレンズの間隔、f:無限遠物体に合焦時の全系の焦点距離とする。
Claims (10)
- 物体側から順に、フォーカシング時固定で正の屈折力を有する第1レンズ群、フォーカシング時に移動する正の屈折力を有する第2レンズ群、フォーカシング時固定の第3レンズ群からなる撮像レンズにおいて、
前記第1レンズ群は、物体側から順に、正の屈折力の第1aレンズ群、絞り、正の屈折力の第1bレンズ群からなり、
前記第1aレンズ群は、物体側に曲率半径の絶対値の小さい凸面を向けた正レンズ1a1、物体側に凸面を向けた負のメニスカスレンズ1a2、物体側に凸面を向けた負のメニスカスレンズ1a3、物体側に凸面を向けた正のメニスカスレンズ1a4、像側に曲率半径の絶対値の小さい凹面を向けた負レンズ1a5、正レンズ1a6、負レンズ1a7、正レンズ1a8と負レンズ1a9の接合レンズからなる
ことを特徴とする撮像レンズ。 - 下記条件式を満足する
ことを特徴とする請求項1記載の撮像レンズ。
0.20<f/f2<0.50 …(1)
ただし、
f:無限遠物体に合焦時の全系の焦点距離
f2:前記第2レンズ群の焦点距離
とする。 - 下記条件式を満足する
ことを特徴とする請求項2記載の撮像レンズ。
0.25<f/f2<0.40 …(1)’ - 前記第2レンズ群は、物体側に曲率半径の絶対値の小さい凸面を向けた正レンズからなる
ことを特徴とする請求項1から3のいずれか1項記載の撮像レンズ。 - 前記第1bレンズ群は、正レンズ1b1と負レンズ1b2の接合レンズからなる
ことを特徴とする請求項1から4のいずれか1項記載の撮像レンズ。 - 前記第3レンズ群は、物体側から順に、像側に曲率半径の絶対値の小さい面を向けた負レンズ31、物体側に曲率半径の絶対値の小さい面を向けた正レンズ32からなる
ことを特徴とする請求項1から5のいずれか1項記載の撮像レンズ。 - 下記条件式を満足する
ことを特徴とする請求項1から6のいずれか1項記載の撮像レンズ。
80<ν1a8 …(2)
40<ν1a9<60 …(3)
ただし、
ν1a8:前記正レンズ1a8のアッベ数
ν1a9:前記負レンズ1a9のアッベ数
とする。 - 下記条件式を満足する
ことを特徴とする請求項1から7のいずれか1項記載の撮像レンズ。
0.20<D/f<0.60 …(4)
ただし、
D:前記絞りと前記1bレンズの間隔
f:無限遠物体に合焦時の全系の焦点距離
とする。 - 下記条件式を満足する
ことを特徴とする請求項8記載の撮像レンズ。
0.30<D/f<0.50 …(4)’ - 請求項1から9のいずれか1項に記載の撮像レンズを備えたことを特徴とする撮像装置。
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CN201390000243.4U CN204101799U (zh) | 2012-02-06 | 2013-02-01 | 摄像透镜及摄像装置 |
JP2013557418A JP5909249B2 (ja) | 2012-02-06 | 2013-02-01 | 撮像レンズおよび撮像装置 |
US14/446,404 US9405106B2 (en) | 2012-02-06 | 2014-07-30 | Imaging lens and imaging apparatus |
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JP2012023014 | 2012-02-06 | ||
JP2012-023014 | 2012-02-06 |
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US14/446,404 Continuation US9405106B2 (en) | 2012-02-06 | 2014-07-30 | Imaging lens and imaging apparatus |
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WO2013118479A1 true WO2013118479A1 (ja) | 2013-08-15 |
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PCT/JP2013/000572 WO2013118479A1 (ja) | 2012-02-06 | 2013-02-01 | 撮像レンズおよび撮像装置 |
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US (1) | US9405106B2 (ja) |
JP (1) | JP5909249B2 (ja) |
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WO (1) | WO2013118479A1 (ja) |
Cited By (1)
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JP2016161647A (ja) * | 2015-02-27 | 2016-09-05 | 株式会社タムロン | 光学系及び撮像装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS495621A (ja) * | 1972-05-04 | 1974-01-18 | ||
JPS57158609A (en) * | 1981-03-25 | 1982-09-30 | Canon Inc | Wide-angle lens |
JP2002107619A (ja) * | 2000-09-28 | 2002-04-10 | Fuji Photo Optical Co Ltd | ワイドコンバータレンズ |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06242370A (ja) | 1993-02-17 | 1994-09-02 | Canon Inc | 大口径レンズ |
JP3445413B2 (ja) | 1995-08-04 | 2003-09-08 | オリンパス光学工業株式会社 | レンズ系 |
JP2005164839A (ja) * | 2003-12-01 | 2005-06-23 | Canon Inc | レンズ系及びそれを有する画像投影装置 |
JP4211761B2 (ja) * | 2005-06-09 | 2009-01-21 | コニカミノルタオプト株式会社 | 撮影レンズユニット |
JP5638709B2 (ja) * | 2012-02-06 | 2014-12-10 | 富士フイルム株式会社 | 広角レンズおよび撮像装置 |
CN104094157B (zh) * | 2012-02-06 | 2016-08-24 | 富士胶片株式会社 | 超广角镜头和摄像装置 |
-
2013
- 2013-02-01 WO PCT/JP2013/000572 patent/WO2013118479A1/ja active Application Filing
- 2013-02-01 JP JP2013557418A patent/JP5909249B2/ja active Active
- 2013-02-01 CN CN201390000243.4U patent/CN204101799U/zh not_active Expired - Lifetime
-
2014
- 2014-07-30 US US14/446,404 patent/US9405106B2/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS495621A (ja) * | 1972-05-04 | 1974-01-18 | ||
JPS57158609A (en) * | 1981-03-25 | 1982-09-30 | Canon Inc | Wide-angle lens |
JP2002107619A (ja) * | 2000-09-28 | 2002-04-10 | Fuji Photo Optical Co Ltd | ワイドコンバータレンズ |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016161647A (ja) * | 2015-02-27 | 2016-09-05 | 株式会社タムロン | 光学系及び撮像装置 |
Also Published As
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JPWO2013118479A1 (ja) | 2015-05-11 |
JP5909249B2 (ja) | 2016-04-26 |
US20140334011A1 (en) | 2014-11-13 |
US9405106B2 (en) | 2016-08-02 |
CN204101799U (zh) | 2015-01-14 |
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