WO2014030304A1 - ズームレンズおよび撮像装置 - Google Patents
ズームレンズおよび撮像装置 Download PDFInfo
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- WO2014030304A1 WO2014030304A1 PCT/JP2013/004636 JP2013004636W WO2014030304A1 WO 2014030304 A1 WO2014030304 A1 WO 2014030304A1 JP 2013004636 W JP2013004636 W JP 2013004636W WO 2014030304 A1 WO2014030304 A1 WO 2014030304A1
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- lens group
- lens
- focal length
- refractive power
- conditional expression
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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
- G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/17—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +--
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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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
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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
- 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
- G02B15/144—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 four groups only
- G02B15/1441—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 four groups only the first group being positive
- G02B15/144109—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 four groups only the first group being positive arranged +--+
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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
- G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/20—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having an additional movable lens or lens group for varying the objective focal length
Definitions
- the present invention relates to a zoom lens and an imaging apparatus, and more specifically, a zoom lens that can be used for an electronic camera such as a digital camera, a video camera, a broadcast camera, a movie camera, a surveillance camera, and the like.
- the present invention relates to an imaging apparatus.
- a telescopic zoom lens mounted on a camera in the above field is desired to be made compact.
- Examples of relatively compact telephoto zoom lenses that have been proposed so far include those described in Patent Documents 1 and 2 below.
- the zoom lens described in Patent Document 1 includes, in order from the object side, a positive first lens group, a negative second lens group, a positive third lens group, and a positive fourth lens group, and a second lens group.
- the third lens group is moved to perform zooming.
- a positive first lens group, a negative second lens group front group, a negative second lens group rear group, and a positive third lens group are arranged in order from the object side.
- the zooming is performed by moving the front group of the second lens group and the rear group of the second lens group.
- the present invention has been made in view of the above circumstances, and a zoom lens in which the overall length of the lens system is shortened with respect to the zoom ratio while maintaining good optical performance, for example, the zoom ratio is about 3.5 times. It is an object of the present invention to provide a zoom lens capable of shortening the total length of the lens system to about one time the focal length at the telephoto end, and an imaging apparatus equipped with such a zoom lens.
- the zoom lens according to the present invention includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a negative refractive power, and a positive lens
- the first lens group and the fourth lens group are substantially composed of four lens groups including a fourth lens group having a refractive power, and the first lens group and the fourth lens group with respect to the image plane upon zooming from the wide-angle end to the telephoto end.
- the third lens group moves monotonically from the object side to the image side, and the second lens group moves to correct image plane variation accompanying zooming, and satisfies the following conditional expression (1): It is characterized by.
- M2 the amount of movement of the second lens unit when zooming from the wide-angle end to the telephoto end
- M3 the amount of movement of the third lens unit when zooming from the wide-angle end to the telephoto end
- the signs of M2 and M3 are images The movement to the side is a positive sign.
- the third lens group monotonically moves from the object side to the image side
- the third lens group moves from the object side to the image side direction without going backward.
- M2 is a difference in position on the optical axis between the wide-angle end and the telephoto end of the second lens group when zooming from the wide-angle end to the telephoto end.
- conditional expression (1-1) 0 ⁇ M2 / M3 ⁇ 0.5 (1-2) 0.15 ⁇ M2 / M3 ⁇ 0.35
- conditional expression (2) 1.0 ⁇
- f2 the focal length of the second lens group
- fw the focal length of the entire system at the wide-angle end.
- conditional expression (3) it is preferable that the following conditional expression (3) is satisfied, and it is more preferable that the following conditional expression (3-1) is satisfied.
- (3) 0.4 ⁇
- f3 the focal length of the third lens group
- fw the focal length of the entire system at the wide-angle end.
- conditional expression (4) 1.0 ⁇ f1 / fw ⁇ 1.5 (4-1) 1.1 ⁇ f1 / fw ⁇ 1.45
- conditional expression (4-1) Focal length fw of the first lens group: The focal length of the entire system at the wide angle end.
- conditional expression (5) 0.6 ⁇ f4 / fw ⁇ 1.0 (5-1) 0.7 ⁇ f4 / fw ⁇ 0.9
- conditional expression f4 the focal length of the fourth lens group
- fw the focal length of the entire system at the wide-angle end.
- the first lens group in order from the object side, and the first lens group having a positive refractive power that is fixed with respect to the image plane at the time of focusing are in focus.
- f1a focal length of the 1a lens group
- f1b focal length of the 1b lens group
- f1 focal length of the first lens group.
- the fourth lens group is composed of, in order from the object side, a 4a lens group having a positive refractive power, a stop, and a 4b lens group. It is preferable that the expressions (8) and (9) are satisfied, and it is more preferable that the following conditional expressions (8-1) and (9-1) are satisfied.
- f4a focal length of the 4a lens group
- f4b focal length of the 4b lens group
- f4 focal length of the 4th lens group.
- the 4b1 lens group has a negative refractive power that is fixed to the image plane in order of close-up photographing in order from the object side.
- the lens unit is substantially composed of a lens unit and a fourth b2 lens unit having a positive refractive power that moves during focusing in close-up photography, and satisfies the following conditional expression (10). (10) -0.1 ⁇ fw / fA ⁇ 0.1 However, fw: the focal length of the entire system at the wide-angle end fA: the focal length at the wide-angle end of the optical system synthesized from the first lens group to the fourth b1 lens group.
- the second lens group includes, in order from the object side, a twenty-first lens having a concave surface directed to the image side, and a twenty-second lens having a positive refractive power having a convex surface directed to the image side.
- a 23rd lens having negative refractive power with the concave surface facing the object side and preferably satisfies the following conditional expression (11).
- ⁇ d22 d-line Abbe number of the 22nd lens
- ⁇ d23 d-line Abbe number of the 23rd lens.
- An image pickup apparatus includes the zoom lens according to the present invention.
- Each of the “lens groups” is not necessarily composed of a plurality of lenses, but includes those composed of only one lens.
- substantially configured in the above-mentioned “substantially configured” means lenses other than the listed components, optical lenses other than lenses having substantially no power, diaphragms, cover glasses, filters, and the like. It is intended that an element, a lens flange, a lens barrel, an image sensor, a mechanism portion such as a camera shake correction mechanism, and the like may be included.
- the sign of the refractive power and the surface shape of the lens are considered in the paraxial region if the lens includes an aspherical surface.
- focal lengths used in the above conditional expressions are in the lens arrangement when the entire system is focused on an object at infinity.
- the zoom lens of the present invention is a zoom lens having a positive, negative, negative, and positive four-group configuration in order from the object side, and performs zooming mainly by moving the third lens group, and the second lens group is changed. Since it is configured to move in order to correct the image plane variation accompanying magnification, the rear principal point position of the optical system that combines the first lens group and the second lens group is brought closer to the object side, particularly at the telephoto end. be able to. Therefore, according to the zoom lens of the present invention, the overall length of the lens system can be shortened with respect to the zoom ratio while maintaining good optical performance.
- the image pickup apparatus of the present invention includes the zoom lens of the present invention, a compact configuration with respect to the zoom ratio is possible, and a good image can be acquired.
- FIGS. 7A to 7L are diagrams showing aberrations of the zoom lens according to Example 1 of the present invention. 8A to 8L are aberration diagrams of the zoom lens according to Example 2 of the present invention.
- FIGS. 9A to 9L are diagrams showing aberrations of the zoom lens according to the third embodiment of the present invention.
- FIGS. 10A to 10L are graphs showing aberrations of the zoom lens according to Example 4 of the present invention.
- FIGS. 11A to 11L are diagrams showing aberrations of the zoom lens according to Example 5 of the present invention.
- 1 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 at the wide-angle end of a zoom lens according to an embodiment of the present invention.
- the example shown in FIG. 1 corresponds to Example 1 described later.
- the left side is the object side
- the right side is the image side, and shows a state in which an object at infinity is in focus.
- FIG. 1 shows an example in which a parallel plate-shaped optical member PP that assumes these is arranged between the lens system and the image plane Sim, but the optical member PP is a zoom according to the present invention. It is not an essential component of the lens.
- the zoom lens according to the present embodiment includes, in order from the object side along the optical axis Z, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a negative refractive power. And a fourth lens group having a positive refracting power and a fourth lens group having a positive refractive power.
- an aperture stop St is provided in the fourth lens group G4.
- 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 zoom lens upon zooming from the wide-angle end to the telephoto end, the first lens group G1 and the fourth lens group G4 are fixed with respect to the image plane Sim, and the third lens group G3 is moved along the optical axis Z.
- the second lens group G2 is configured to move along the optical axis Z in order to correct image plane variation accompanying zooming. That is, in this zoom lens, the third lens group G3 serves as a variator group, and the second lens group G2 serves as a compensator group.
- FIG. 1 the movement trajectory of each lens group at the time of zooming from the wide-angle end to the telephoto end is schematically shown by arrows below the second lens group G2 and the third lens group G3.
- a first lens group having a positive refractive power in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive or negative refractive power, and a fourth lens having a positive refractive power.
- the object of the second lens group is a variator group when zooming from the wide-angle end to the telephoto end.
- the third lens group is moved from the side to the image side, and the third lens group is a compensator group.
- the zoom lens according to the present embodiment is a variator group, and the second lens group G2 is a compensator group, so that the second lens during zooming from the wide-angle end to the telephoto end is performed.
- the amount of movement of the lens group G2 in the optical axis direction can be made smaller than that of the general conventional example.
- the rear principal point position (image side principal point position) of the optical system that combines the first lens group G1 and the second lens group G2 can be brought closer to the object side, particularly at the telephoto end. It is advantageous for shortening.
- This zoom lens is configured to satisfy the following conditional expression (1).
- conditional expression (1) If the lower limit of conditional expression (1) is not reached, distortion will worsen on the wide angle side. If the upper limit of conditional expression (1) is exceeded, it becomes difficult to make the third lens group G3 a variator group and the second lens group G2 a compensator group, which is disadvantageous for shortening the overall length of the lens system.
- the second lens group G2 and the third lens group G3 can be moved from the most image-side surface of the first lens group G1 in order to secure a moving space for zooming.
- the distance on the optical axis to the surface closest to the object side of the four lens group G4 tends to be long, which is disadvantageous for shortening the overall length of the lens system.
- the distance on the optical axis from the most image-side surface of the first lens group G1 to the most object-side surface of the fourth lens group G4 is forcibly shortened to shorten the overall length of the lens system,
- the refractive power of the second lens group G2 and the third lens group G3 becomes too strong, and various aberrations, particularly distortion at the wide-angle end and spherical aberration at the telephoto end are deteriorated.
- Satisfying the conditional expression (1-1) is advantageous for shortening the overall length of the lens system and favorably correcting various aberrations.
- conditional expression (1-2) 0.15 ⁇ M2 / M3 ⁇ 0.35
- the zoom lens satisfies the following conditional expression (2).
- (2) 1.0 ⁇
- f2 focal length of the second lens group
- fw focal length of the entire system at the wide angle end
- conditional expression (2) If the upper limit of conditional expression (2) is exceeded, the refractive power of the second lens group G2 becomes weak, the amount of movement for correcting the image plane variation accompanying zooming becomes large, and the total length of the lens system becomes long. On the other hand, if the lower limit of conditional expression (2) is not reached, the refractive power of the second lens group G2 becomes strong, leading to deterioration of spherical aberration. Further, the effective diameter of the lens of the first lens group G1 is increased, which is disadvantageous for downsizing. Satisfying the conditional expression (2) is advantageous for shortening the overall length of the lens system, favoring correction of spherical aberration, and miniaturization.
- conditional expression (2-1) 1.1 ⁇
- the zoom lens satisfies the following conditional expression (3).
- f3 focal length of the third lens unit
- fw focal length of the entire system at the wide angle end
- conditional expression (3) When the upper limit of conditional expression (3) is exceeded, the refractive power of the third lens group G3 becomes weak, the amount of movement during zooming increases, and the total length of the lens system increases. If the lower limit of conditional expression (3) is not reached, the refractive power of the third lens group G3 becomes too strong, leading to deterioration of spherical aberration. Further, the effective diameter of the lens of the first lens group G1 is increased, which is disadvantageous for downsizing. Satisfying the conditional expression (3) is advantageous for shortening the overall length of the lens system, favoring correction of spherical aberration, and miniaturization.
- conditional expression (3-1) 0.45 ⁇
- the zoom lens satisfies the following conditional expression (4).
- (4) 1.0 ⁇ f1 / fw ⁇ 1.5
- f1 focal length of the first lens unit
- fw focal length of the entire system at the wide angle end
- conditional expression (4) When the upper limit of conditional expression (4) is exceeded, the refractive power of the first lens group G1 becomes weak, and the total length of the lens system becomes long. If the lower limit of conditional expression (4) is not reached, the refractive power of the first lens group G1 becomes too strong, resulting in deterioration of spherical aberration and aberration fluctuation during focusing. Satisfying the conditional expression (4) is advantageous for shortening the overall length of the lens system, favorably correcting spherical aberration, and suppressing aberration fluctuations during focusing.
- conditional expression (4-1) 1.1 ⁇ f1 / fw ⁇ 1.45
- the zoom lens satisfies the following conditional expression (5). (5) 0.6 ⁇ f4 / fw ⁇ 1.0
- f4 focal length of the fourth lens group
- fw focal length of the entire system at the wide angle end
- conditional expression (5) If the upper limit of conditional expression (5) is exceeded, the focal length of the fourth lens group G4 becomes longer and the overall length of the lens system becomes longer. On the other hand, if the lower limit of conditional expression (5) is not reached, spherical aberration and field curvature are deteriorated and sufficient back focus cannot be obtained. Satisfying the conditional expression (5) is advantageous for shortening the overall length of the lens system, favorably correcting spherical aberration and curvature of field, and ensuring sufficient back focus.
- conditional expression (5-1) 0.7 ⁇ f4 / fw ⁇ 0.9
- the first lens group G1 is in order from the object side to the first a lens group G1a having a positive refractive power that is fixed with respect to the image plane Sim at the time of focusing. It is preferable that the first lens unit G1b has a positive refractive power and is substantially composed of the first lens unit G1b.
- the first lens group G1 has a strong refractive power in order to make the entire length of the lens system compact. When the entire first lens group G1 is moved during focusing, the fluctuation in aberration due to focusing increases, so the first a lens group G1a fixed during focusing and the first b lens group G1b used for focusing. It is important to separate them.
- conditional expression (6) If the upper limit of conditional expression (6) is exceeded, the focal length of the first lens group G1a becomes longer, the refractive power of the first lens group G1b increases, and aberration fluctuations due to focusing increase. Below the lower limit of conditional expression (6), the focal length of the 1b lens group G1b is increased, the amount of movement of the 1b lens group G1b during focusing is increased, and the overall length of the lens system is increased. If the upper limit of conditional expression (7) is exceeded, the focal length of the first lens group G1b increases and the overall length of the lens system becomes longer. If the lower limit of conditional expression (7) is not reached, the refractive power of the first-b lens group G1b becomes strong, and the aberration fluctuations due to focusing become large. Satisfying conditional expressions (6) and (7) is advantageous for shortening the total length of the lens system and suppressing aberration fluctuations during focusing.
- conditional expression (6-1) is further satisfied.
- conditional expression (7-1) is further satisfied.
- the fourth lens group G4 is composed of, in order from the object side, a fourth a lens group G4a having a positive refractive power, an aperture stop St, and a fourth b lens group G4b. It is preferable.
- the aperture stop St By disposing the aperture stop St on the image side of the 4a lens group G4a having a positive refractive power, the aperture diameter can be reduced and the mechanical structure can be made compact.
- the refractive power of the 4a lens group G4a becomes weak, and it becomes difficult to reduce the aperture diameter. If the lower limit of conditional expression (8) is not reached, the refractive power of the 4a lens group G4a becomes strong, and spherical aberration and curvature of field deteriorate. If the upper limit of conditional expression (9) is exceeded, the positive refractive power of the 4b lens group G4b will increase, and in order to balance it, the refractive power of the 4a lens group G4a must be weakened. It becomes difficult to make it smaller.
- conditional expression (9) If the lower limit of conditional expression (9) is not reached, the negative refracting power of the 4b lens group G4b becomes strong, and in order to balance it, the refracting power of the 4a lens group G4a has to be strengthened. Deterioration of field curvature occurs. Satisfying conditional expressions (8) and (9) is advantageous for downsizing of the apparatus and good correction of spherical aberration and field curvature.
- conditional expression (8-1) In order to further enhance the above-described operation and effect relating to the conditional expression (8), it is preferable that the following conditional expression (8-1) is further satisfied. In order to further enhance the above-described effect with respect to conditional expression (9), it is preferable to satisfy the following conditional expression (9-1). (8-1) 0.5 ⁇ f4a / f4 ⁇ 1.0 (9-1) -0.2 ⁇ f4 / f4b ⁇ 0.45
- the fourth lens group G4 is configured to include, in order from the object side, a positive 4a lens group G4a, an aperture stop St, and a 4b lens group G4b
- a part of the 4b lens group G4b May be moved to focus at the time of close-up photography.
- the 4b lens group G4b in order from the object side, the fourth b1 lens group G4b1 having a negative refractive power fixed with respect to the image plane Sim at the time of focusing for close-up shooting, and the focusing for close-up shooting.
- the fourth b2 lens group G4b2 having a positive refractive power that moves in the optical axis direction may be substantially constituted.
- the focus group that moves when focusing in normal shooting it has a lens group that moves when focusing in close-up shooting, making it possible to have a close-up shooting mode that is different from the normal shooting mode. More close shooting is possible.
- the fourth lens group G4b is configured to include the fourth lens group G4b1 and the fourth lens group G4b2, it is preferable that the following conditional expression (10) is satisfied. (10) -0.1 ⁇ fw / fA ⁇ 0.1 However, fw: focal length of the entire system at the wide-angle end fA: focal length at the wide-angle end of the optical system synthesized from the first lens group to the fourth b1 lens group
- conditional expression (10) When the upper limit of conditional expression (10) is exceeded, the amount of movement of the fourth b1 lens group G4b1 for switching to the close-up mode increases, and aberration fluctuations when switched to the close-up mode become large. If the lower limit of conditional expression (10) is not reached, it is disadvantageous for shortening the overall length of the lens system. Satisfying conditional expression (10) is advantageous in suppressing aberration fluctuations in the close-up mode and shortening the overall length of the lens system.
- the second lens group G2 of the zoom lens includes, in order from the object side, a twenty-first lens L21 having a concave surface directed to the image side, a twenty-second lens L22 having a positive refractive power having a convex surface directed to the image side, It is substantially composed of a 23rd lens L23 having a negative refractive power with the concave surface facing the object side, and preferably satisfies the following conditional expression (11). By satisfying conditional expression (11), it is possible to satisfactorily correct lateral chromatic aberration, particularly secondary chromatic aberration. (11) ⁇ d22 ⁇ d23 ⁇ 50 However, ⁇ d22: d-line Abbe number of the 22nd lens ⁇ d23: d-line Abbe number of the 23rd lens
- the second lens group G2 preferably includes at least one aspheric surface. If the overall length of the lens system is shortened, the power load on the first lens group G1 and the second lens group G2 increases, and it becomes difficult to correct spherical aberration. Is preferred. At this time, in the telephoto system, it is advantageous in terms of aberration correction to use an aspheric surface for the first lens group G1 having a thick transmitted light beam. However, since the first lens group G1 has a large effective diameter, an aspheric surface is used for the first lens group G1. Use is disadvantageous in terms of cost.
- the second lens group G2 Since the second lens group G2 has a small movement amount for image plane correction and is close to the first lens group G1, it is most practical and cost-effective to arrange an aspheric surface in the second lens group G2. In particular, since the light beam is the thickest on the most object side surface in the second lens group G2, it is preferable to provide an aspheric surface on the most object side surface in the second lens group G2.
- the first-a lens group G1a can be composed of, in order from the object side, a negative meniscus lens having a concave surface directed to the image side and a biconvex lens.
- the negative meniscus lens and the biconvex lens may be cemented or a single lens that is not cemented.
- the first-b lens group G1b includes, in order from the object side, a negative meniscus lens having a concave surface facing the image side, a positive lens having a convex surface facing the object side, and a positive lens having a convex surface facing the object side. be able to. Among these, it is preferable that the negative meniscus lens and the positive lens which are the first and second lenses from the object side are cemented.
- the third lens group G3 includes, in order from the object side, a negative lens having a concave surface facing the image side, a positive meniscus lens having a convex surface facing the object side, a biconcave lens, and a negative meniscus lens having a concave surface facing the image side.
- a negative lens having a concave surface facing the image side a positive meniscus lens having a convex surface facing the object side
- a biconcave lens which is the third and fourth lenses from the object side
- the negative meniscus lens are cemented.
- the third lens group G3 may include, in order from the object side, a negative lens having a concave surface facing the image side, a positive meniscus lens having a convex surface facing the object side, and a biconcave lens.
- the 4a lens group G4a can be composed of, in order from the object side, a biconvex lens, a positive lens having a convex surface facing the object side, a biconvex lens, and a biconcave lens.
- the biconvex lens and the biconcave lens which are the third and fourth lenses from the object side are preferably cemented.
- the fourth b1 lens group G4b1 can be composed of, in order from the object side, a positive lens having a convex surface facing the image side and a biconcave lens. In this case, it is preferable that these two lenses are joined.
- the fourth b1 lens group G4b1 may include only one negative meniscus lens having a concave surface facing the image side.
- the fourth b2 lens group G4b2 can be composed of, for example, in order from the object side, a biconvex lens, a negative lens having a concave surface directed toward the object side, a biconvex lens, a biconcave lens, and a biconvex lens.
- the biconvex lens and the biconcave lens which are the third and fourth lenses from the object side are preferably cemented.
- the preferred configurations described above can be arbitrarily combined, and are preferably selectively adopted as appropriate according to the specifications required for the zoom lens. For example, by adopting a preferable configuration as appropriate, a compact telephoto with a total angle of view of about 21 degrees at the wide-angle end, a zoom ratio of about 3.5 times, and a total length of the lens system of about 1 times the focal length of the telephoto end. A zoom lens can be realized.
- FIG. 2 is a cross-sectional view showing the configuration of the zoom lens of Example 1.
- the upper stage, middle stage, and lower stage, each labeled with W, M, and T on the left, show the arrangement and configuration of each lens group at the wide-angle end, intermediate focal length state, and telephoto end, respectively.
- the schematic configuration of the zoom lens of Example 1 is as follows. That is, the zoom lens of Example 1 includes, in order from the object side, a first lens G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group having a negative refractive power. G3 and a fourth lens group having a positive refractive power are arranged. An aperture stop St is provided in the fourth lens group G4. Note that the aperture stop St shown in FIG. 2 does not necessarily indicate the size or shape, but indicates the position on the optical axis Z. Further, FIG. 2 shows an example in which a parallel plate-shaped optical member PP assuming various filters, a cover glass, and the like is disposed between the fourth lens group G4 and the image plane Sim.
- the first lens group G1 and the fourth lens group G4 are fixed with respect to the image plane Sim, and the third lens group G3 is moved along the optical axis Z.
- the second lens group G2 is configured to move along the optical axis Z in order to correct image plane variation accompanying zooming.
- the first lens group G1 includes, in order from the object side, a first a lens group G1a having a positive refractive power that is fixed with respect to the image plane Sim at the time of focusing, and a positive refractive power that moves at the time of focusing.
- 1b lens group G1b having The first-a lens group G1a includes, in order from the object side, a negative meniscus eleventh lens L11 having a concave surface directed toward the image side, and a biconvex twelfth lens L12.
- the 1b lens group G1b includes, in order from the object side, a negative meniscus thirteenth lens L13 with a concave surface facing the image side, a positive fourteenth lens L14 with a convex surface facing the object side, and a convex surface facing the object side And a positive fifteenth lens L15.
- the thirteenth lens L13 and the fourteenth lens L14 are cemented.
- the second lens group G2 includes, in order from the object side, a biconcave 21st lens L21 in the paraxial region, a positive 22nd lens L22 with a convex surface facing the image side, and a negative with a concave surface facing the object side And a 23rd lens L23.
- the 22nd lens L22 and the 23rd lens L23 are cemented. In the entire system, the aspheric surface is provided only on the object side surface of the twenty-first lens L21.
- the third lens group G3 includes, in order from the object side, a negative 31st lens L31 having a concave surface directed toward the image side, a positive meniscus 32nd lens L32 having a convex surface directed toward the object side, and a biconcave 33rd lens.
- the lens L33 includes a negative meniscus thirty-fourth lens L34 having a concave surface facing the image side.
- the 31st lens L31 and the 32nd lens L32 are cemented, and the 33rd lens L33 and the 34th lens L34 are cemented.
- the fourth lens group G4 includes, in order from the object side, a 4a lens group G4a having a positive refractive power, an aperture stop St, and a 4b lens group G4b.
- the fourth b lens group G4b is arranged in order from the object side, the fourth b1 lens group G4b1 having a negative refractive power fixed with respect to the image plane Sim at the time of focusing for close-up shooting, and at the time of focusing for close-up shooting. It consists of a 4b2 lens group G4b2 having positive refractive power that moves.
- the 4a lens group G4a includes, in order from the object side, a biconvex 41st lens L41, a positive 42nd lens L42 having a convex surface directed toward the object side, a biconvex 43rd lens L43, and a biconcave shape No. 44 lens L44.
- the 43rd lens L43 and the 44th lens L44 are cemented.
- the 4b1 lens group G4b1 is composed of a positive 45th lens L45 having a convex surface directed toward the image side and a biconcave 46th lens L46 in order from the object side.
- the 45th lens L45 and the 46th lens L46 are cemented.
- the fourth b2 lens group G4b2 includes, in order from the object, a biconvex 47th lens L47, a negative 48th lens L48 having a concave surface directed toward the object, a biconvex 49th lens L49, and a biconcave The 50th lens L50 and the biconvex 51st lens L51.
- the 47th lens L47 and the 48th lens L48 are cemented, and the 49th lens L49 and the 50th lens L50 are cemented.
- Table 1 shows basic lens data of the zoom lens of Example 1.
- the column indicates the radius of curvature of the i-th surface
- the column Di indicates the surface interval on the optical axis Z between the i-th surface and the i + 1-th surface.
- Optical element that increases sequentially toward the image side with the most object-side component as the first.
- the refractive index is shown, and the column ⁇ dj shows the Abbe number of the j-th optical element with respect to the d-line.
- the basic lens data includes the aperture stop St and the optical member PP, and the surface number and the phrase (St) are described in the surface number column of the surface corresponding to the aperture stop St.
- 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 value in the lowest column of Di is the distance between the image side surface of the optical member PP and the image plane Sim.
- the surface number of the aspherical surface is marked with *, and the numerical value of the paraxial radius of curvature is shown in the column of the radius of curvature of the aspherical surface.
- Table 2 shows the aspheric coefficients of the aspheric surface of Example 1.
- the numerical value “En” (n: integer) of the aspheric coefficient in Table 2 means “ ⁇ 10 ⁇ n ”.
- Zd C ⁇ h 2 / ⁇ 1+ (1 ⁇ KA ⁇ C 2 ⁇ h 2 ) 1/2 ⁇ + ⁇ Am ⁇ h m
- Zd Depth of aspheric surface (length of a perpendicular line drawn from a point on the aspherical surface at height h to a plane perpendicular to the optical axis where the aspherical vertex contacts)
- h Height (distance from the optical axis to the lens surface)
- C paraxial curvature KA
- Table 3 shows data relating to the d-line and data relating to zooming and focusing at the wide-angle end, the intermediate focal length state, and the telephoto end of the zoom lens of Example 1.
- F 'in Table 3 is the focal length of the entire system
- Bf' is the back focus (air equivalent length)
- 2 ⁇ is the total angle of view (in degrees).
- the surface intervals are variable surface intervals that change at the time of zooming or focusing.
- the interval between the i-th surface and the i + 1-th surface is a variable surface interval. Is described as DD [i].
- the distance between the first lens group G1 and the second lens group G2, the distance between the second lens group G2 and the third lens group G3, and the distance between the third lens group G3 and the fourth lens group G4 are variable surface intervals that change during zooming.
- the distance between the 1a lens group G1a and the 1b lens group G1b and the distance between the 1b lens group G1b and the second lens group G2 are variable surface distances that change at the time of focusing.
- the distance between the fourth b1 lens group G4b1 and the fourth b2 lens group G4b2, and the distance between the fourth b2 lens group G4b2 and the optical member PP are variable surface distances that change during focusing in the close-up mode, and are respectively DD [31], Table 1 Corresponds to DD [39].
- the table in the second row of Table 3 shows the value of each variable surface interval when focusing on an object at infinity.
- the third table in Table 3 shows the values of DD [4] and DD [9] when an object with an object distance of 1.2 m is in focus.
- DD [31] DD [when the fourth b2 lens group G4b2 is further moved from the state where the object distance is in focus to the object of 1.2 m and the close-up shooting is performed. 39] and the object distance focused at each of the wide-angle end, the intermediate focal length state, and the telephoto end at that time.
- the object distance here means the distance on the optical axis from the lens surface closest to the object to the object in the entire system.
- Tables 1 to 3 numerical values rounded by a predetermined digit are shown. In Tables 1 to 3, numerical values related to lengths without units are expressed in mm.
- FIGS. 7A to 7D show aberration diagrams of spherical aberration, astigmatism, distortion (distortion), and chromatic aberration of magnification (chromatic aberration of magnification) of the zoom lens of Example 1 at the wide-angle end, respectively.
- FIGS. 7E to 7H show aberration diagrams of spherical aberration, astigmatism, distortion (distortion), and chromatic aberration of magnification (chromatic aberration of magnification) of the zoom lens of Example 1 in the intermediate focal length state, respectively. Indicates.
- FIGS. 7E to 7H show aberration diagrams of spherical aberration, astigmatism, distortion (distortion), and chromatic aberration of magnification (chromatic aberration of magnification) of the zoom lens of Example 1 in the intermediate focal length state, respectively. Indicates.
- FIGS. 7A to 7L show respective aberration diagrams of the spherical aberration, astigmatism, distortion (distortion), and lateral chromatic aberration (chromatic aberration of magnification) of the zoom lens of Example 1 at the telephoto end. .
- FIGS. 7A to 7L are all when the object at infinity is in focus.
- Each aberration diagram shows aberrations with the d-line (587.56 nm) as the reference wavelength, while the spherical aberration diagram also shows aberrations for the C-line (wavelength 656.27 nm) and F-line (wavelength 486.13 nm).
- the chromatic aberration diagram for magnification aberrations for the C line and the F line are shown.
- the aberrations relating to the sagittal direction and the tangential direction are indicated by solid lines and broken lines, and symbols (S) and (T) are entered in the description of the line types.
- FNo. Means F number, and ⁇ in other aberration diagrams means half angle of view.
- FIG. 3 is a lens configuration diagram of the zoom lens according to the second embodiment.
- the schematic configuration of the zoom lens of Example 2 is substantially the same as the schematic configuration of the zoom lens of Example 1 described above, except that the eleventh lens L11 and the twelfth lens L12 are cemented, and the 47th lens L47.
- the 48th lens L48 is different in that it is not cemented.
- Tables 4, 5, and 6 show basic lens data, aspheric coefficients, specifications, and data regarding zooming / focusing of the zoom lens of Example 2, respectively.
- FIGS. 8A to 8L show aberration diagrams of the zoom lens of Example 2.
- FIGS. 8A to 8L show aberration diagrams of the zoom lens of Example 2.
- FIG. 4 is a lens configuration diagram of the zoom lens according to the third embodiment.
- the schematic configuration of the zoom lens of Example 3 is substantially the same as that of the zoom lens of Example 2, except that the 34th lens L34 is not provided, the configuration of the 4b1 lens group G4b1, and the configuration of the 4b2 lens group G4b2. Is different.
- the fourth b1 lens group G4b1 of the zoom lens of Example 3 comprises solely a negative meniscus 45th lens L45 with the concave surface facing the image side.
- the fourth b2 lens group G4b2 of the zoom lens of Example 3 includes, in order from the object, a biconvex 46th lens L46, a biconcave 47th lens L47, a biconvex 48th lens L48, It consists of a concave 49th lens L49 and a biconvex 50th lens L50.
- the 48th lens L48 and the 49th lens L49 are cemented.
- Table 7, Table 8, and Table 9 show the basic lens data, aspheric coefficient, specifications, data on zooming and focusing, respectively, of the zoom lens of Example 3.
- 9A to 9L show aberration diagrams of the zoom lens according to Example 3.
- FIG. 1
- FIG. 5 is a lens configuration diagram of the zoom lens of Example 4.
- the schematic configuration of the zoom lens of Example 4 is substantially the same as that of the zoom lens of Example 3, but is different in that it does not have a close-up mode.
- the fourth lens group G4b of the zoom lens of Example 4 includes, in order from the object side, a biconvex 45th lens L45, a biconcave 46th lens L46, a biconvex 47th lens L47, and both It comprises a concave 48th lens L48 and a biconvex 49th lens L49.
- the 47th lens L47 and the 48th lens L48 are cemented.
- Table 10, Table 11, and Table 12 show the basic lens data, aspheric coefficient, specifications, data on zooming and focusing, respectively, of the zoom lens of Example 4.
- FIGS. 10A to 10L show aberration diagrams of the zoom lens of Example 4.
- FIGS. 10A to 10L show aberration diagrams of the zoom lens of Example 4.
- FIG. 6 is a lens configuration diagram of the zoom lens of Example 5.
- the schematic configuration of the zoom lens of Example 5 is substantially the same as that of the zoom lens of Example 4.
- Table 13, Table 14, and Table 15 show the basic lens data, aspheric coefficient, specifications, data on zooming and focusing, respectively, of the zoom lens of Example 5.
- FIGS. 11A to 11L show aberration diagrams of the zoom lens of Example 5.
- Table 16 shows the corresponding values of the conditional expressions (1) to (10) in Examples 1 to 5 and the values related to the conditional expression (11).
- Table 16 also shows the value of TTL / ft when the total length of the lens system is TTL and the focal length of the entire telephoto end system is ft. The values shown in Table 16 are for the d line.
- the overall length of the lens system is the focal length at the telephoto end while maintaining good optical performance in the telephoto system with a zoom ratio of 3.4 to 3.5 times. It can be seen that downsizing is achieved, which is 1 time or less.
- FIG. 12 shows a schematic configuration diagram of an imaging apparatus 10 using the zoom lens 1 according to the embodiment of the present invention as an example of the imaging apparatus of the embodiment of the present invention.
- the imaging apparatus include a film camera, a digital camera, a video camera, a broadcast camera, a movie camera, and an electronic camera such as a surveillance camera.
- An imaging apparatus 10 illustrated in FIG. 12 includes a zoom lens 1, a filter 2 disposed on the image side of the zoom lens 1, an imaging element 3 that captures an image of a subject formed by the zoom lens, and an imaging element 3.
- a signal processing unit 4 a zooming control unit 5, and a focus control unit 6.
- the zoom lens 1 has a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a negative refractive power, and a positive refractive power.
- FIG. 12 conceptually shows each lens group.
- the image pickup device 3 picks up an image of a subject formed by the zoom lens 1 and converts it into an electric signal, and is arranged so that its image pickup surface coincides with the image surface of the zoom lens.
- a CCD Charge-Coupled Device
- CMOS Complementary Metal-Oxide Semiconductor
- the zooming control unit 5 performs zooming by moving the third lens group G3 in the optical axis direction, and moves the second lens group G2 in the optical axis direction so as to correct image plane fluctuations accompanying the zooming.
- the focus control unit 5 is configured to focus by moving the first lens group G1 and / or the fourth lens group G4 in the optical axis direction when the object distance varies.
- 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 are not limited to the values shown in the above numerical examples, and can take other values.
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Abstract
Description
(1)0<M2/M3<1.0
ただし、
M2:広角端から望遠端へ変倍する際の第2レンズ群の移動量
M3:広角端から望遠端へ変倍する際の第3レンズ群の移動量
であり、M2、M3の符号は像側への移動を正符号とする。
(1-1)0<M2/M3<0.5
(1-2)0.15<M2/M3<0.35
(2)1.0<|f2/fw|<2.0
(2-1)1.1<|f2/fw|<1.8
ただし、
f2:第2レンズ群の焦点距離
fw:広角端での全系の焦点距離
である。
(3)0.4<|f3/fw|<0.9
(3-1)0.45<|f3/fw|<0.8
ただし、
f3:第3レンズ群の焦点距離
fw:広角端での全系の焦点距離
である。
(4)1.0<f1/fw<1.5
(4-1)1.1<f1/fw<1.45
ただし、
f1:第1レンズ群の焦点距離
fw:広角端での全系の焦点距離
である。
(5)0.6<f4/fw<1.0
(5-1)0.7<f4/fw<0.9
ただし、
f4:第4レンズ群の焦点距離
fw:広角端での全系の焦点距離
である。
(6)2.0<f1a/f1<3.7
(7)1.0<f1b/f1<1.8
(6-1)2.2<f1a/f1<3.3
(7-1)1.2<f1b/f1<1.6
ただし、
f1a:第1aレンズ群の焦点距離
f1b:第1bレンズ群の焦点距離
f1:第1レンズ群の焦点距離
である。
(8)0.4<f4a/f4<1.2
(9)-0.4<f4/f4b<0.6
(8-1)0.5<f4a/f4<1.0
(9-1)-0.2<f4/f4b<0.45
ただし、
f4a:第4aレンズ群の焦点距離
f4b:第4bレンズ群の焦点距離
f4:第4レンズ群の焦点距離
である。
(10)-0.1<fw/fA<0.1
ただし、
fw:広角端での全系の焦点距離
fA:第1レンズ群から第4b1レンズ群までを合成した光学系の広角端での焦点距離
である。
(11)νd22<νd23<50
ただし、
νd22:第22レンズのd線のアッベ数
νd23:第23レンズのd線のアッベ数
である。
(1)0<M2/M3<1.0
ここで、
M2:広角端から望遠端へ変倍する際の第2レンズ群の移動量
M3:広角端から望遠端へ変倍する際の第3レンズ群の移動量
であり、M2、M3の符号はそれぞれ、第2レンズ群G2、第3レンズ群G3が像側へ移動する場合を正、物体側へ移動する場合を負としている。
(1-1)0<M2/M3<0.5
(1-2)0.15<M2/M3<0.35
(2)1.0<|f2/fw|<2.0
ただし、
f2:第2レンズ群の焦点距離
fw:広角端での全系の焦点距離
(2-1)1.1<|f2/fw|<1.8
(3)0.4<|f3/fw|<0.9
ただし、
f3:第3レンズ群の焦点距離
fw:広角端での全系の焦点距離
(3-1)0.45<|f3/fw|<0.8
(4)1.0<f1/fw<1.5
ただし、
f1:第1レンズ群の焦点距離
fw:広角端での全系の焦点距離
(4-1)1.1<f1/fw<1.45
(5)0.6<f4/fw<1.0
ただし、
f4:第4レンズ群の焦点距離
fw:広角端での全系の焦点距離
(5-1)0.7<f4/fw<0.9
(6)2.0<f1a/f1<3.7
(7)1.0<f1b/f1<1.8
ただし、
f1a:第1aレンズ群の焦点距離
f1b:第1bレンズ群の焦点距離
f1:第1レンズ群の焦点距離
(6-1)2.2<f1a/f1<3.3
(7-1)1.2<f1b/f1<1.6
(8)0.4<f4a/f4<1.2
(9)-0.4<f4/f4b<0.6
ただし、
f4a:第4aレンズ群の焦点距離
f4b:第4bレンズ群の焦点距離
f4:第4レンズ群の焦点距離
(8-1)0.5<f4a/f4<1.0
(9-1)-0.2<f4/f4b<0.45
(10)-0.1<fw/fA<0.1
ただし、
fw:広角端での全系の焦点距離
fA:第1レンズ群から第4b1レンズ群までを合成した光学系の広角端での焦点距離
(11)νd22<νd23<50
ただし、
νd22:第22レンズのd線のアッベ数
νd23:第23レンズのd線のアッベ数
<実施例1>
実施例1のズームレンズの構成を示す断面図を図2に示す。左側にそれぞれW、M、Tという記号が付された上段、中段、下段に、それぞれ広角端、中間焦点距離状態、望遠端における各レンズ群の配置と構成を示している。
ただし、
Zd:非球面深さ(高さhの非球面上の点から、非球面頂点が接する光軸に垂直な平面に下ろした垂線の長さ)
h:高さ(光軸からのレンズ面までの距離)
C:近軸曲率
KA、Am:非球面係数(m=3、4、5、…12)
図3に実施例2のズームレンズのレンズ構成図を示す。実施例2のズームレンズの概略構成は、上述した実施例1のズームレンズの概略構成と略同様であるが、第11レンズL11と第12レンズL12が接合されている点、第47レンズL47と第48レンズL48が接合されていない点において相違している。表4、表5、表6にそれぞれ実施例2のズームレンズの基本レンズデータ、非球面係数、諸元と変倍・合焦に関するデータを示す。図8(A)~図8(L)に実施例2のズームレンズの各収差図を示す。
図4に実施例3のズームレンズのレンズ構成図を示す。実施例3のズームレンズの概略構成は、実施例2のズームレンズのものと略同様であるが、第34レンズL34を有しない点、第4b1レンズ群G4b1の構成、第4b2レンズ群G4b2の構成において相違している。実施例3のズームレンズの第4b1レンズ群G4b1は、像側に凹面を向けた負メニスカス形状の第45レンズL45のみからなる。実施例3のズームレンズの第4b2レンズ群G4b2は、物体側から順に、両凸形状の第46レンズL46と、両凹形状の第47レンズL47と、両凸形状の第48レンズL48と、両凹形状の第49レンズL49と、両凸形状の第50レンズL50とからなる。第48レンズL48と第49レンズL49は接合されている。
図5に実施例4のズームレンズのレンズ構成図を示す。実施例4のズームレンズの概略構成は、実施例3のズームレンズのものと略同様であるが、近接撮影モードを備えていない点において相違している。実施例4のズームレンズの第4bレンズ群G4bは、物体側から順に、両凸形状の第45レンズL45と、両凹形状の第46レンズL46と、両凸形状の第47レンズL47と、両凹形状の第48レンズL48と、両凸形状の第49レンズL49とからなる。第47レンズL47と第48レンズL48は接合されている。
図6に実施例5のズームレンズのレンズ構成図を示す。実施例5のズームレンズの概略構成は、実施例4のズームレンズのものと略同様である。表13、表14、表15にそれぞれ実施例5のズームレンズの基本レンズデータ、非球面係数、諸元と変倍・合焦に関するデータを示す。図11(A)~図11(L)に実施例5のズームレンズの各収差図を示す。
Claims (19)
- 物体側から順に、正の屈折力を有する第1レンズ群と、負の屈折力を有する第2レンズ群と、負の屈折力を有する第3レンズ群と、正の屈折力を有する第4レンズ群とが配されてなる4つのレンズ群から実質的に構成され、
広角端から望遠端への変倍に際して、前記第1レンズ群と前記第4レンズ群は像面に対して固定され、前記第3レンズ群は物体側から像側へ単調に移動し、前記第2レンズ群は変倍に伴う像面変動を補正するために移動し、下記条件式(1)を満足することを特徴とするズームレンズ。
(1)0<M2/M3<1.0
ただし、
M2:広角端から望遠端へ変倍する際の第2レンズ群の移動量
M3:広角端から望遠端へ変倍する際の第3レンズ群の移動量
であり、M2、M3の符号は像側への移動を正符号とする。 - 下記条件式(1-1)を満足する請求項1記載のズームレンズ。
(1-1)0<M2/M3<0.5 - 下記条件式(2)を満足する請求項1または2記載のズームレンズ。
(2)1.0<|f2/fw|<2.0
ただし、
f2:第2レンズ群の焦点距離
fw:広角端での全系の焦点距離
である。 - 下記条件式(3)を満足する請求項1から3のいずれかに記載のズームレンズ。
(3)0.4<|f3/fw|<0.9
ただし、
f3:第3レンズ群の焦点距離
fw:広角端での全系の焦点距離
である。 - 下記条件式(4)を満足する請求項1から4のいずれかに記載のズームレンズ。
(4)1.0<f1/fw<1.5
ただし、
f1:第1レンズ群の焦点距離
fw:広角端での全系の焦点距離
である。 - 前記第2レンズ群は少なくとも1面の非球面を含む請求項1から5のいずれかに記載のズームレンズ。
- 下記条件式(5)を満足する請求項1から6のいずれかに記載のズームレンズ。
(5)0.6<f4/fw<1.0
ただし、
f4:第4レンズ群の焦点距離
fw:広角端での全系の焦点距離
である。 - 前記第1レンズ群が、物体側から順に、合焦の際に像面に対して固定される正の屈折力を有する第1aレンズ群と、合焦の際に移動する正の屈折力を有する第1bレンズ群とから実質的に構成され、
下記条件式(6)、(7)を満足する請求項1から7のいずれかに記載のズームレンズ。
(6)2.0<f1a/f1<3.7
(7)1.0<f1b/f1<1.8
ただし、
f1a:第1aレンズ群の焦点距離
f1b:第1bレンズ群の焦点距離
f1:第1レンズ群の焦点距離
である。 - 前記第4レンズ群が、物体側から順に、正の屈折力を有する第4aレンズ群と、絞りと、第4bレンズ群とから実質的に構成され、
下記条件式(8)、(9)を満足する請求項1から8のいずれかに記載のズームレンズ。
(8)0.4<f4a/f4<1.2
(9)-0.4<f4/f4b<0.6
ただし、
f4a:第4aレンズ群の焦点距離
f4b:第4bレンズ群の焦点距離
f4:第4レンズ群の焦点距離
である。 - 前記第4bレンズ群が、物体側から順に、近接撮影の合焦の際に像面に対して固定される負の屈折力を有する第4b1レンズ群と、近接撮影の合焦の際に移動する正の屈折力を有する第4b2レンズ群とから実質的に構成され、
下記条件式(10)を満足する請求項9記載のズームレンズ。
(10)-0.1<fw/fA<0.1
ただし、
fw:広角端での全系の焦点距離
fA:第1レンズ群から第4b1レンズ群までを合成した光学系の広角端での焦点距離
である。 - 前記第2レンズ群は、物体側から順に、像側に凹面を向けた第21レンズと、像側に凸面を向けた正の屈折力を有する第22レンズと、物体側に凹面を向けた負の屈折力を有する第23レンズとから実質的に構成され、
下記条件式(11)を満足する請求項1から10のいずれかに記載のズームレンズ。
(11)νd22<νd23<50
ただし、
νd22:第22レンズのd線のアッベ数
νd23:第23レンズのd線のアッベ数
である。 - 下記条件式(1-2)を満足する請求項1から11のいずれかに記載のズームレンズ。
(1-2)0.15<M2/M3<0.35 - 下記条件式(2-1)を満足する請求項1から12のいずれかに記載のズームレンズ。
(2-1)1.1<|f2/fw|<1.8
ただし、
f2:第2レンズ群の焦点距離
fw:広角端での全系の焦点距離
である。 - 下記条件式(3-1)を満足する請求項1から13のいずれかに記載のズームレンズ。
(3-1)0.45<|f3/fw|<0.8
ただし、
f3:第3レンズ群の焦点距離
fw:広角端での全系の焦点距離
である。 - 下記条件式(4-1)を満足する請求項1から14のいずれかに記載のズームレンズ。
(4-1)1.1<f1/fw<1.45
ただし、
f1:第1レンズ群の焦点距離
fw:広角端での全系の焦点距離
である。 - 下記条件式(5-1)を満足する請求項1から15のいずれかに記載のズームレンズ。
(5-1)0.7<f4/fw<0.9
ただし、
f4:第4レンズ群の焦点距離
fw:広角端での全系の焦点距離
である。 - 前記第1レンズ群が、物体側から順に、合焦の際に像面に対して固定される正の屈折力を有する第1aレンズ群と、合焦の際に移動する正の屈折力を有する第1bレンズ群とから実質的に構成され、
下記条件式(6-1)、(7-1)を満足する請求項1から16のいずれかに記載のズームレンズ。
(6-1)2.2<f1a/f1<3.3
(7-1)1.2<f1b/f1<1.6
ただし、
f1a:第1aレンズ群の焦点距離
f1b:第1bレンズ群の焦点距離
f1:第1レンズ群の焦点距離
である。 - 前記第4レンズ群が、物体側から順に、正の屈折力を有する第4aレンズ群と、絞りと、第4bレンズ群とから実質的に構成され、
下記条件式(8-1)、(9-1)を満足する請求項1から17のいずれかに記載のズームレンズ。
(8-1)0.5<f4a/f4<1.0
(9-1)-0.2<f4/f4b<0.45
ただし、
f4a:第4aレンズ群の焦点距離
f4b:第4bレンズ群の焦点距離
f4:第4レンズ群の焦点距離
である。 - 請求項1に記載のズームレンズを備えたことを特徴とする撮像装置。
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CN201380043535.0A CN104603666B (zh) | 2012-08-22 | 2013-07-31 | 变焦透镜以及摄像装置 |
JP2014531491A JP5732176B2 (ja) | 2012-08-22 | 2013-07-31 | ズームレンズおよび撮像装置 |
DE112013004140.5T DE112013004140B4 (de) | 2012-08-22 | 2013-07-31 | Zoomobjektiv und Abbildungsvorrichtung |
US14/627,047 US9405107B2 (en) | 2012-08-22 | 2015-02-20 | Zoom lens and imaging apparatus |
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US14/627,047 Continuation US9405107B2 (en) | 2012-08-22 | 2015-02-20 | Zoom lens and imaging apparatus |
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Family
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JP (1) | JP5732176B2 (ja) |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015176119A (ja) * | 2014-03-18 | 2015-10-05 | キヤノン株式会社 | ズームレンズ及びそれを有する撮像装置 |
JP2016004075A (ja) * | 2014-06-13 | 2016-01-12 | キヤノン株式会社 | ズームレンズ及びそれを有する撮像装置 |
JP2016048353A (ja) * | 2014-08-28 | 2016-04-07 | キヤノン株式会社 | ズームレンズ及びそれを有する撮像装置 |
CN106164734A (zh) * | 2014-03-27 | 2016-11-23 | 株式会社尼康 | 变焦镜头、摄像装置以及变焦镜头的制造方法 |
JP2020181157A (ja) * | 2019-04-26 | 2020-11-05 | キヤノン株式会社 | レンズ装置、撮像装置、補正方法およびプログラム |
Families Citing this family (8)
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EP3159726B1 (en) * | 2015-10-20 | 2024-07-03 | Canon Kabushiki Kaisha | Zoom lens and image pickup apparatus including the same |
JP6702771B2 (ja) * | 2016-03-25 | 2020-06-03 | キヤノン株式会社 | ズームレンズ及びそれを有する撮像装置 |
CN107450171B (zh) * | 2017-08-09 | 2019-11-19 | 福建福光股份有限公司 | 适用于3ccd摄像机的透射式超长焦距高清变焦镜头 |
CN107643591B (zh) * | 2017-11-01 | 2023-08-15 | 河南中光学集团有限公司 | 一种反衰减透雾可见光镜头及实现方法 |
JP6918731B2 (ja) | 2018-02-28 | 2021-08-11 | キヤノン株式会社 | 光学系及び撮像装置 |
JP6976998B2 (ja) * | 2018-02-28 | 2021-12-08 | キヤノン株式会社 | 光学系及び撮像装置 |
CN112285985B (zh) * | 2020-11-06 | 2022-05-20 | 深圳市爱图仕影像器材有限公司 | 带有可变焦镜头的灯具及可变焦镜头 |
JP2023072954A (ja) * | 2021-11-15 | 2023-05-25 | キヤノン株式会社 | ズームレンズおよび撮像装置 |
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-
2013
- 2013-07-31 DE DE112013004140.5T patent/DE112013004140B4/de not_active Expired - Fee Related
- 2013-07-31 WO PCT/JP2013/004636 patent/WO2014030304A1/ja active Application Filing
- 2013-07-31 JP JP2014531491A patent/JP5732176B2/ja active Active
-
2015
- 2015-02-20 US US14/627,047 patent/US9405107B2/en active Active
Patent Citations (2)
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JPS6227712A (ja) * | 1985-07-30 | 1987-02-05 | Tokinaa Kogaku Kk | 望遠ズ−ムレンズ |
JP2002072092A (ja) * | 2000-09-04 | 2002-03-12 | Minolta Co Ltd | 前絞りズームレンズ |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2015176119A (ja) * | 2014-03-18 | 2015-10-05 | キヤノン株式会社 | ズームレンズ及びそれを有する撮像装置 |
CN106164734A (zh) * | 2014-03-27 | 2016-11-23 | 株式会社尼康 | 变焦镜头、摄像装置以及变焦镜头的制造方法 |
EP3125010A4 (en) * | 2014-03-27 | 2017-10-04 | Nikon Corporation | Zoom lens, imaging device, and zoom lens production method |
US10663704B2 (en) | 2014-03-27 | 2020-05-26 | Nikon Corporation | Zoom lens, imaging device and method for manufacturing the zoom lens |
JP2016004075A (ja) * | 2014-06-13 | 2016-01-12 | キヤノン株式会社 | ズームレンズ及びそれを有する撮像装置 |
JP2016048353A (ja) * | 2014-08-28 | 2016-04-07 | キヤノン株式会社 | ズームレンズ及びそれを有する撮像装置 |
JP2020181157A (ja) * | 2019-04-26 | 2020-11-05 | キヤノン株式会社 | レンズ装置、撮像装置、補正方法およびプログラム |
US11573410B2 (en) | 2019-04-26 | 2023-02-07 | Canon Kabushiki Kaisha | Lens apparatus, image pickup apparatus, method of correcting change in focal position, and storage medium |
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DE112013004140T5 (de) | 2015-05-13 |
US9405107B2 (en) | 2016-08-02 |
CN104603666A (zh) | 2015-05-06 |
DE112013004140B4 (de) | 2016-09-15 |
US20150160444A1 (en) | 2015-06-11 |
JP5732176B2 (ja) | 2015-06-10 |
JPWO2014030304A1 (ja) | 2016-07-28 |
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