US20140184884A1 - Zoom lens and camera device - Google Patents

Zoom lens and camera device Download PDF

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Publication number
US20140184884A1
US20140184884A1 US14/141,011 US201314141011A US2014184884A1 US 20140184884 A1 US20140184884 A1 US 20140184884A1 US 201314141011 A US201314141011 A US 201314141011A US 2014184884 A1 US2014184884 A1 US 2014184884A1
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Prior art keywords
lens
lens group
zoom lens
refractive power
zoom
Prior art date
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Abandoned
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US14/141,011
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English (en)
Inventor
Yoshito Iwasawa
Jun Takahashi
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Tamron Co Ltd
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Tamron Co Ltd
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Assigned to TAMRON CO., LTD. reassignment TAMRON CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IWASAWA, YOSHITO, TAKAHASHI, JUN
Publication of US20140184884A1 publication Critical patent/US20140184884A1/en
Priority to US15/364,588 priority Critical patent/US10359611B2/en
Priority to US15/364,590 priority patent/US10545321B2/en
Abandoned legal-status Critical Current

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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
    • 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
    • G02B15/146—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 more than five groups
    • G02B15/1461—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 more than five groups the first group being positive
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
    • G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/005—Diaphragms

Definitions

  • the present invention relates to zoom lenses, interchangeable lens units incorporating the zoom lenses, and camera devices used with the same. More particularly, the present invention relates to high variable power compact zoom lenses suitable to camera optical systems for digitized signal input/output devices such as digital still cameras, digital video cameras, and the like, interchangeable lens units incorporating the zoom lenses, and camera devices used with the same.
  • optical systems in such camera systems are of higher-performance oriented and increasingly downsizing oriented design to meet the market demands for zoom lens optical systems with a shortened entire length and for lens barrels with a reduced diameter.
  • optical systems, such as tele-photographing zoom lenses, having an increased focal length should be of more enhanced performance and reduced dimensions.
  • One prior art highly variable power compact zoom lens which satisfies the demands of higher-performance and reduced dimensions, comprises the foremost or first lens group G 1 of positive refractive power located the closest to an object, the succeeding or second lens group G 2 of negative refractive power, the third lens group G 3 of positive refractive power, and the fourth lens group L 4 of positive refractive power located the closest to the imaging plane, and such a prior art zoom lens meets the requirements as defined in the following formula:
  • Lt is an entire length of the optical system (a distance from the front surface of the front lens piece the closest to the object to the imaging plane) when the zoom lens is taking a posture of the telephoto end
  • Ft is a focal length of the optical system as a whole when the zoom lens is taking a posture of the telephoto end
  • Fw is a focal length of the optical system as a whole when the zoom lens is taking a posture of the wide-angle end (e.g., see Patent Document 1 listed below).
  • Patent Document 1
  • the prior art highly variable power compact zoom lens mentioned above has its lens group of negative refractive power deviated/displaced in directions normal to the optical axis to serve as an anti-vibration lens, which is intended to downsize the lens barrel by downsizing the anti-vibration lens in diametral dimension. Due to a great displacement of the first lens group, however, the cam mechanism in the lens barrel is unavoidably so complicated as recognized in multi-stage cam design, and the resultant zoom lens is still unsatisfactory in that the lens barrel is not sufficiently downsized.
  • the present invention is directed to providing an improved zoom lens that attains high-performance imaging suitable to changeable lenses and/or camera devices incorporating solid-state image sensors, such as digital still cameras, digital video cameras, and the like, of which pixels are much more minute than those of photographing film, and providing an improved camera device used with such a zoom lens.
  • the present invention is also directed to providing an improved zoom lens in which a displacement of a lens group(s) moved to vary optical power is reduced so as to reduce a diametral dimension of the lens barrel and simplify a barrel structure, and also, in which a lens group(s) of negative refractive power serve as an anti-vibration lens to attain the same object, namely to reduce the diametral dimension of the lens barrel.
  • a first zoom lens in accordance with the present invention comprises three or more groups of lens pieces, the foremost or first lens group of positive refractive power located the closest to an object, the succeeding second lens group of negative refractive power, and the third lens group of positive refractive power, all arranged in this order, and if any, the rearmost lens group(s) closer to the imaging plane than the third lens group, all or part of the lens group(s) of negative refractive power behind the third lens group being moved in directions normal to the optical axis to serve as an anti-vibration lens for shifting an image; and the zoom lens meets the requirements as defined in the following formula:
  • X1 is a displacement of the first lens group when the zoom lens is extended from the wide-angle end to the telephoto end to vary optical power
  • fw is a focal length of the zoom lens at the wide-angle end
  • fT is a focal length of the zoom lens at the telephoto end
  • f1 is a focal length of the first lens group
  • f3 is a focal length of the third lens group.
  • a second zoom lens in accordance with the present invention comprises five or more groups of lens pieces, the foremost or first lens group of positive refractive power located the closest to an object, the succeeding second lens group of negative refractive power, the third lens group of positive refractive power, the fourth lens group, and the fifth lens group, all arranged in this order, all or part of the lens group(s) of negative refractive power behind the third lens group being moved in directions normal to the optical axis to serve as an anti-vibration lens for shifting an image; and the zoom lens meets the requirements as defined in the following formula:
  • X1 is a displacement of the first lens group when the zoom lens is extended from the wide-angle end to the telephoto end to vary optical power
  • fw is a focal length of the zoom lens at the wide-angle end
  • fT is a focal length of the zoom lens at the telephoto end
  • f1 is a focal length of the first lens group.
  • a camera device in accordance with the present invention comprises image sensors disposed on or behind the imaging plane of any of the aforementioned zoom lenses according to the present invention, for converting an optical image created by the zoom lens into electrical signals.
  • the zoom lens attains high-performance imaging suitable to attachment lenses and/or camera devices incorporating solid-state image sensors, such as digital still cameras, digital video cameras, and the like, of which pixels are much more minute than those of photographing film, and the camera device is suitably used with such a zoom lens.
  • a displacement of a lens group(s) moved to vary optical power is reduced so as to reduce a diametral dimension of the lens barrel and simplify a barrel structure, and also, the lens group(s) of negative refractive power serve as an anti-vibration lens to attain the same object, namely to reduce the diametral dimension of the lens barrel.
  • the zoom lens according to the present invention which comprises at least three groups of lens pieces, namely, the foremost or first lens group of positive refractive power positioned the closest to an object, the second lens group of negative refractive power, and the third lens group of positive refractive power, and if any, the rearmost lens group(s) behind the third lens group, is capable of varying three or more dimensional components or distances between the lens groups adjacent to each other during varying its optical power so as to obtain an enhanced freedom to compensate for aberrations.
  • the first zoom lens meets the requirements as defined about the third lens group in the following formula (3):
  • f3 is a focal length of the third lens group.
  • the first or second zoom lens of the present invention comprises a lens group(s) of positive refractive power and/or a component lens piece(s) of positive refractive power located closer to the object than all or part of the lens group(s) of negative refractive power moved to serve as an anti-vibration lens for shifting an image.
  • the first or second zoom lens of the present invention has one or more lens pieces of positive and negative refractive power in all or part of the lens group(s) of negative refractive power moved to serve as an anti-vibration lens for shifting an image.
  • the first or second zoom lens of the present invention is designed so that part or all of the lens group(s) moved to serve as an anti-vibration lens for shifting an image meet the requirements as defined in the following formula (4):
  • ⁇ a is an optical power of the lens group(s) movable in directions normal to the optical axis when the zoom lens is taking a posture of the telephoto end
  • ⁇ b is a synthetic optical power of a lens group(s) closer to the imaging plane than the lens group(s) movable in directions normal to the optical axis.
  • the first or second zoom lens of the present invention is designed to meet the requirements as defined in the following formula (5):
  • Lt is an entire length of the optical system of the zoom lens at the telephoto end
  • fT is a focal length of the zoom lens at the telephoto end
  • the first or second zoom lens of the present invention comprises two or more lens groups located behind the third lens group and moved to vary optical power.
  • the formula (1) defines the requirements for a displacement of the first lens group in the zoom lens during extending from the wide-angle end to the telephoto end.
  • the resultant zoom lens has its optical system varied not so much in entire length between the telephoto end and the wide-angle end, but the entire length of the optical system at the wide-angle end is excessively great, which in turn brings about an increase in a diameter of the first lens group located the closest to the object as well as an increase of an entire longitudinal dimension of the lens barrel.
  • formula (1) may desirably be modified as follows:
  • formula (1) may desirably be modified as follows:
  • the formula (2) defines the requirements for a focal distance of the first lens group in the zoom lens.
  • formula (2) may desirably be modified as follows:
  • formula (2) may desirably be modified as follows:
  • the formula (3) defines the requirements for a focal distance of the third lens group in the zoom lens.
  • formula (3) may desirably be modified as follows:
  • formula (3) may desirably be modified as follows:
  • the formula (4) defines the requirements for a rate of a displacement of the lens group(s) movable in directions normal to the optical axis to an amount by which an image is shifted.
  • the resultant zoom lens adversely permits an image to shift greatly even with a minor displacement of the lens group(s) movable in directions normal to the optical axis or the anti-vibration lens, and thus, high-precision control of the anti-vibration lens is required.
  • the resultant zoom lens has to have the anti-vibration lens displaced more in directions normal to the optical axis to shift the image by a predetermined amount, and for that purpose, a larger lens actuator system for driving the anti-vibration lens is needed, which hinders downsizing the lens barrel.
  • the formula (5) defines the requirements for dimensions of the optical system of the zoom lens at the telephoto end.
  • Fulfilling the conditions defined in the formula (5) enables the zoom lens especially to have the optical system considerably reduced in entire length when it is taking a posture of the telephoto end and have the optical system enhanced in imaging performance.
  • the resultant zoom lens has its optical system excessively reduced in entire length when it is taking a posture of the telephoto end, and the zoom lens encounters a difficulty in ensuring the desired optical performance when it is taking a posture of the wide-angle end.
  • the resultant zoom lens has its optical system increased in entire length when it is taking a posture of the telephoto end, which hinders downsizing the lens barrel.
  • FIG. 1 is a vertical sectional view showing a lens arrangement in a first embodiment of a zoom lens according to the present invention when the zoom lens is taking a posture of the wide-angle end,
  • FIG. 2 depicts graphs of spherical aberration, astigmatism, and distortion aberration developed in the first embodiment of the zoom lens when the zoom lens taking a posture of the wide-angle end is in focus on the point at infinity, the graphs of spherical aberration showing a rate of a stop setting F-number to the full diaphragm stop setting F-number on the vertical axis and a degree of defocusing on the horizontal axis for the d-line (wavelength 587.6 nm) expressed by solid line, the c-line (wavelength 656.3 nm) by broken line, and the g-line (wavelength 435.8 nm) by alternate long and short dash line, the graphs of astigmatism showing an image height on the vertical axis and a degree of defocusing on the horizontal axis for a sagittal imaging plane expressed by solid line and a meridional imaging plane by broken line, and the graphs of distortion aberration show an image height on the vertical axi
  • FIG. 3 depicts graphs of spherical aberration, astigmatism, and distortion aberration developed in the first embodiment of the zoom lens when the zoom lens taking a posture of the intermediate zooming range is in focus on the point at infinity,
  • FIG. 4 depicts graphs of spherical aberration, astigmatism, and distortion aberration developed in the first embodiment of the zoom lens when the zoom lens taking a posture of the telephoto end is in focus on the point at infinity,
  • FIG. 5 is a vertical sectional view showing a lens arrangement in a second embodiment of the zoom lens according to the present invention when the zoom lens is taking a posture of the wide-angle end,
  • FIG. 6 depicts graphs of spherical aberration, astigmatism, and distortion aberration developed in the second embodiment of the zoom lens when the zoom lens taking a posture of the wide-angle end is in focus on the point at infinity,
  • FIG. 7 depicts graphs of spherical aberration, astigmatism, and distortion aberration developed in the second embodiment of the zoom lens when the zoom lens taking a posture of the intermediate zooming range is in focus on the point at infinity,
  • FIG. 8 depicts graphs of spherical aberration, astigmatism, and distortion aberration developed in the second embodiment of the zoom lens when the zoom lens taking a posture of the telephoto end is in focus on the point at infinity,
  • FIG. 9 is a vertical sectional view showing a third embodiment of the zoom lens according to the present invention when the zoom lens is taking a posture of the wide-angle end,
  • FIG. 10 depicts graphs of spherical aberration, astigmatism, and distortion aberration developed in the third embodiment of the zoom lens when the zoom lens taking a posture of the wide-angle end is in focus on the point at infinity,
  • FIG. 11 depicts graphs of spherical aberration, astigmatism, and distortion aberration developed in the third embodiment of the zoom lens when the zoom lens taking a posture of the intermediate zooming range is in focus on the point at infinity,
  • FIG. 12 depicts graphs of spherical aberration, astigmatism, and distortion aberration developed in the third embodiment of the zoom lens when the zoom lens taking a posture of the telephoto end is in focus on the point at infinity,
  • FIG. 13 is a vertical sectional view showing a fourth embodiment of the zoom lens according to the present invention when the zoom lens is taking a posture of the wide-angle end,
  • FIG. 14 depicts graphs of spherical aberration, astigmatism, and distortion aberration developed in the fourth embodiment of the zoom lens when the zoom lens taking a posture of the wide-angle end is in focus on the point at infinity,
  • FIG. 15 depicts graphs of spherical aberration, astigmatism, and distortion aberration developed in the fourth embodiment of the zoom lens when the zoom lens taking a posture of the intermediate zooming range is in focus on the point at infinity,
  • FIG. 16 depicts graphs of spherical aberration, astigmatism, and distortion aberration developed in the fourth embodiment of the zoom lens when the zoom lens taking a posture of the telephoto end is in focus on the point at infinity,
  • FIG. 17 is a vertical sectional view showing a fifth embodiment of the zoom lens according to the present invention when the zoom lens is taking a posture of the wide-angle end,
  • FIG. 18 depicts graphs of spherical aberration, astigmatism, and distortion aberration developed in the fifth embodiment of the zoom lens when the zoom lens taking a posture of the wide-angle end is in focus on the point at infinity,
  • FIG. 19 depicts graphs of spherical aberration, astigmatism, and distortion aberration developed in the fifth embodiment of the zoom lens when the zoom lens taking a posture of the intermediate zooming range is in focus on the point at infinity, and
  • FIG. 20 depicts graphs of spherical aberration, astigmatism, and distortion aberration developed in the fifth embodiment of the zoom lens when the zoom lens taking a posture of the telephoto end is in focus on the point at infinity.
  • FIG. 1 is a vertical sectional view showing a lens arrangement of a first embodiment of a zoom lens according to the present invention.
  • the first embodiment of the zoom lens comprises the foremost or first lens group G 1 of positive refractive power located the closest to an object, the succeeding second lens group G 2 of negative refractive power, the third lens group G 3 of positive refractive power, the fourth lens group G 4 of positive refractive power, the fifth lens group G 5 of negative refractive power, and the rearmost or sixth lens group G 6 of negative refractive power arranged in this order.
  • the first lens group G 1 comprises a duplet of a meniscus lens piece L 1 of negative refractive power with its convex surface oriented to the object and a lens piece L 2 of positive refractive power cemented with the meniscus lens piece L 1 , and a lens piece L 3 of positive refractive power, all the lens pieces being arranged in this order from the closest to the object in the foremost position to the farthest in the rearmost position.
  • the second lens group G 2 comprises a duplet of a lens piece L 4 of negative refractive power with its concave surface oriented toward the object and a meniscus lens piece L 5 of positive refractive power cemented with the lens piece L 4 , and a meniscus lens piece L 6 of negative refractive power with its concave surface oriented toward the object.
  • the third lens group G 3 comprises a biconvex lens piece L 7 , a biconvex lens piece L 8 , a duplet of a lens piece L 9 of positive refractive power with its convex surface oriented toward the object and a lens piece L 10 of negative refractive power cemented with the lens piece L 9 , and another duplet of a biconcave lens piece L 11 and a meniscus lens piece L 12 of positive refractive power with its convex surface oriented toward the object, all the lens pieces arranged in this order from the closest to the object in the foremost position to the farthest in the rearmost position.
  • the fourth lens group G 4 comprises a biconvex lens piece L 13 , and a duplet of a lens piece L 14 of positive refractive power with its convex surface oriented toward the object and a lens piece L 15 of positive refractive power cemented with the lens piece L 14 , all the lens pieces being arranged in this order from the closest to the object in the foremost position to the farthest from the object in the rearmost position.
  • the fifth lens group G 5 comprises a duplet of a biconvex lens piece L 16 positioned closer to the object and a biconcave lens piece L 17 cemented with the biconvex lens piece L 16 .
  • the sixth lens group G 6 comprises a meniscus lens piece L 18 of negative refractive power with its concave surface oriented toward the object.
  • the first embodiment of the zoom lens has its first lens group moved toward the object, its second lens group held in a fixed position, its third lens group moved on a trajectory that draws an are toward the imaging plane relative to the second lens group, its fourth lens group moved on a trajectory that draws an arc toward the imaging plane relative to the third lens group, its fifth lens group moved toward the object, and its sixth lens group moved in the same manner as the fourth lens group.
  • Focusing on an object at the near point is carried out by moving the fifth lens group toward the imaging plane.
  • the duplet of the lens pieces L 11 and L 12 cemented together is moved in vertical directions normal to the optical axis so as to correct fuzziness of an image during photographing.
  • Optical data of the lens pieces in the first embodiment of the zoom lens are provided in Table 1.
  • Surface number NS designates the n-th lens surface of the optical system where all the component lens pieces are arranged in order on the closest-to-the-object-first basis
  • R is a radius of curvature of the n-th lens surface
  • D is a distance along the optical axis between a pair of the adjacent lens surfaces
  • An aperture stop or an aperture diaphragm is denoted by STOP suffixed to the surface number.
  • FIG. 5 is a vertical sectional view showing a lens arrangement of a second embodiment of the zoom lens according to the present invention.
  • the second embodiment of the zoom lens comprises the foremost or first lens group G 1 of positive refractive power located the closest to an object, the succeeding second lens group G 2 of negative refractive power, the third lens group G 3 of positive refractive power, the fourth lens group G 4 of positive refractive power, and the fifth lens group G 5 of negative refractive power, all the lens groups being arranged in this order.
  • the first lens group G 1 comprises a duplet of a meniscus lens piece L 1 of negative refractive power with its convex surface oriented to the object and a lens piece L 2 of positive refractive power cemented with the meniscus lens piece L 1 , and a meniscus lens piece L 3 of positive refractive power with its convex surface oriented to the object, all the lens pieces being arranged in this order from the closest to the object in the foremost position to the farthest in the rearmost position.
  • the second lens group G 2 comprises a duplet of a lens piece L 4 of positive refractive power and a lens piece L 5 of negative refractive power cemented with the lens piece L 4 , another duplet of a lens piece L 6 of positive refractive power with its convex surface oriented toward the object and a lens piece L 7 of negative refractive power cemented with the lens piece L 6 , and a meniscus lens piece L 8 of negative refractive power with its concave surface oriented to the object, all the lens pieces being arranged in this order from the closest to the object in the foremost position to the farthest in the rearmost position.
  • the third lens group G 3 comprises a biconvex lens piece L 9 , a biconvex lens piece L 10 , a duplet of a lens piece L 11 of positive refractive power with its convex surface oriented to the object and a lens piece L 12 of negative refractive power cemented with the lens piece L 11 , and another duplet of a biconcave lens piece L 13 and a meniscus lens piece L 14 of positive refractive power with its convex surface oriented to the object, and cemented with the biconcave lens piece L 13 , all the lens pieces being arranged in this order from the closest to the object in the foremost position to the farthest in the rearmost position.
  • the fourth lens group G 4 comprises a biconvex lens piece L 15 , and a duplet of a lens piece L 16 of positive refractive power with its convex surface oriented toward the object and a lens piece L 17 of negative refractive power cemented with the lens piece L 16 , all the lens pieces being arranged in this order from the closest to the object in the foremost position to the farthest from the object in the rearmost position.
  • the fifth lens group G 5 comprises a lens piece L 18 of negative refractive power with its convex surface oriented toward the object, and a duplet of a biconcave lens piece L 19 and a lens piece L 20 of positive refractive power cemented with the lens piece L 19 , all the lens pieces being arranged in this order from the closest to the object in the foremost position to the farthest in the rearmost position.
  • the second embodiment of the zoom lens has its first lens group moved toward the object, its second lens group held in a fixed position, its third lens group moved on a trajectory that draws an are toward the imaging plane relative to the second lens group, its fourth lens group moved on a trajectory that draws an arc toward the imaging plane relative to the third lens group, and its fifth lens group moved toward the object.
  • the fourth lens group are moved toward the imaging plane.
  • the duplet of the cemented lens pieces L 13 and L 14 are moved in directions normal to the optical axis so as to correct fuzziness of an image during photographing.
  • Optical data of the second embodiment of the zoom lens are provided in Table 4.
  • FIG. 9 is a vertical sectional view showing a lens arrangement of a third embodiment of the zoom lens according to the present invention.
  • the third embodiment of the zoom lens comprises the foremost or first lens group G 1 of positive refractive power located the closest to an object, the succeeding second lens group G 2 of negative refractive power, the third lens group G 3 of positive refractive power, the fourth lens group G 4 of positive refractive power, and the fifth lens group G 5 of negative refractive power, all the lens groups being arranged in this order.
  • the first lens group G 1 comprises a duplet of a meniscus lens piece L 1 of negative refractive power with its convex surface oriented to the object and a lens piece L 2 of positive refractive power cemented with the meniscus lens piece L 1 , and a lens piece L 3 of positive refractive power, all the lens pieces being arranged in this order from the closest to the object in the foremost position to the farthest in the rearmost position.
  • the second lens group G 2 comprises a duplet of a lens piece L 4 of positive refractive power with its convex surface oriented toward the object and a lens piece L 5 of negative refractive power cemented with the lens piece L 4 , another duplet of a meniscus lens piece L 6 of negative refractive power with its convex surface oriented toward the object and a lens piece L 7 of positive refractive power cemented with the lens piece L 6 , and a meniscus lens piece L 8 of negative refractive power with its concave surface oriented to the object.
  • the third lens group G 3 comprises a biconvex lens piece L 9 , a biconvex lens piece L 10 , a duplet of a lens piece L 11 of positive refractive power with its convex surface oriented to the object and a lens piece L 12 of negative refractive power cemented with the lens piece L 11 , and another duplet of a biconcave lens piece L 13 and a meniscus lens piece L 14 of positive refractive power with its convex surface oriented to the object, and cemented with the biconcave lens piece L 13 , all the lens pieces being arranged in this order from the closest to the object in the foremost position to the farthest in the rearmost position.
  • the fourth lens group G 4 comprises a biconvex lens piece L 15 , and a duplet of a lens piece L 16 of positive refractive power with its convex surface oriented toward the object and a lens piece L 17 of negative refractive power cemented with the lens piece L 16 , all the lens pieces being arranged in this order from the closest to the object in the foremost position to the farthest from the object in the rearmost position.
  • the fifth lens group G 5 comprises a lens piece L 18 of negative refractive power with its convex surface oriented toward the object, and a duplet of a biconcave lens piece L 19 and a meniscus lens piece L 20 of positive refractive power with its convex surface oriented to the object, and cemented with the lens piece L 19 , all the lens pieces being arranged in this order from the closest to the object in the foremost position to the farthest in the rearmost position.
  • the third embodiment of the zoom lens has its first lens group moved toward the object, its second lens group held in a fixed position, its third lens group moved on a trajectory that draws an arc toward the imaging plane relative to the second lens group, its fourth lens group moved on a trajectory that draws an arc toward the imaging plane relative to the third lens group, and its fifth lens group moved toward the object.
  • the fourth lens group For focusing on an object at the near point, the fourth lens group are moved toward the object.
  • the duplet of the cemented lens pieces L 13 and L 14 are moved in directions normal to the optical axis so as to correct fuzziness of an image during photographing.
  • Optical data of the third embodiment of the zoom lens are provided in Table 7.
  • FIG. 13 is a vertical sectional view showing a lens arrangement of a fourth embodiment of the zoom lens according to the present invention.
  • the fourth embodiment of the zoom lens comprises the foremost or first lens group G 1 of positive refractive power located the closest to an object, the succeeding second lens group G 2 of negative refractive power, the third lens group G 3 of positive refractive power, the fourth lens group G 4 of positive refractive power, and the fifth lens group G 5 of negative refractive power, all the lens groups being arranged in this order.
  • the first lens group G 1 comprises a duplet of a meniscus lens piece L 1 of negative refractive power with its convex surface oriented to the object and a lens piece L 2 of positive refractive power cemented with the meniscus lens piece L 1 , and a lens piece L 3 of positive refractive power, all the lens pieces being arranged in this order from the closest to the object in the foremost position to the farthest in the rearmost position.
  • the second lens group G 2 comprises a duplet of a lens piece L 4 of positive refractive power with its convex surface oriented toward the object and a lens piece L 5 of negative refractive power cemented with the lens piece L 4 , another duplet of a meniscus lens piece L 6 of negative refractive power with its convex surface oriented toward the object and a lens piece L 7 of positive refractive power cemented with the lens piece L 6 , and a meniscus lens piece L 8 of negative refractive power with its concave surface oriented to the object.
  • the third lens group G 3 comprises a biconvex lens piece L 9 , a biconvex lens piece L 10 , a duplet of a lens piece L 11 of positive refractive power with its convex surface oriented to the object and a lens piece L 12 of negative refractive power cemented with the lens piece L 11 , and another duplet of a biconcave lens piece L 13 and a meniscus lens piece L 14 of positive refractive power with its convex surface oriented to the object, and cemented with the biconcave lens piece L 13 , all the lens pieces being arranged in this order from the closest to the object in the foremost position to the farthest in the rearmost position.
  • the fourth lens group G 4 comprises a biconvex lens piece L 15 , and a duplet of a lens piece L 16 of positive refractive power with its convex surface oriented toward the object and a lens piece L 17 of negative refractive power cemented with the lens piece L 16 , all the lens pieces being arranged in this order from the closest to the object in the foremost position to the farthest from the object in the rearmost position.
  • the fifth lens group G 5 comprises a lens piece L 18 of negative refractive power with its convex surface oriented toward the object, and a duplet of a biconcave lens piece L 19 and a meniscus lens piece L 20 of positive refractive power with its convex surface oriented to the object, and cemented with the lens piece L 19 , all the lens pieces being arranged in this order on the basis of the foremost first.
  • the fourth embodiment of the zoom lens has its first lens group moved toward the object, its second lens group held in a fixed position, its third lens group moved on a trajectory that draws an are toward the imaging plane relative to the second lens group, its fourth lens group moved on a trajectory that draws an arc toward the imaging plane relative to the third lens group, and its fifth lens group moved toward the object.
  • the fourth lens group For focusing on an object at the near point, the fourth lens group are moved toward the object.
  • the duplet of the cemented lens pieces L 13 and L 14 are moved in directions normal to the optical axis so as to correct fuzziness of an image during photographing.
  • Optical data of the fourth embodiment of the zoom lens are provided in Table 10.
  • FIG. 17 is a vertical sectional view showing a lens arrangement of a fifth embodiment of the zoom lens according to the present invention.
  • the fifth embodiment of the zoom lens comprises the foremost or first lens group G 1 of positive refractive power located the closest to an object, the succeeding second lens group G 2 of negative refractive power, the third lens group G 3 of positive refractive power, the fourth lens group G 4 of positive refractive power, and the fifth lens group G 5 of negative refractive power, all the lens groups being arranged in this order.
  • the first lens group G 1 comprises a duplet of a meniscus lens piece L 1 of negative refractive power with its convex surface oriented to the object and a lens piece L 2 of positive refractive power cemented with the meniscus lens piece L 1 , and a meniscus lens piece L 3 of positive refractive power with its convex surface oriented toward the object, all the lens pieces being arranged in this order from the closest to the object in the foremost position to the farthest from the object in the rearmost position.
  • the second lens group G 2 comprises a duplet of a lens piece L 4 of positive 8 refractive power with its convex surface oriented toward the object and a lens piece L 5 of negative refractive power cemented with the lens piece L 4 , another duplet of a meniscus lens piece L 6 of negative refractive power with its convex surface oriented toward the object and a lens piece L 7 of positive refractive power cemented with the lens piece L 6 , and a meniscus lens piece L 8 of negative refractive power with its concave surface oriented to the object.
  • the third lens group G 3 comprises a biconvex lens piece L 9 , a biconvex lens piece L 10 , a duplet of a biconvex lens piece L 11 and a lens piece L 12 of negative refractive power cemented with the lens piece L 11 , and another duplet of a biconcave lens piece L 13 and a meniscus lens piece L 14 of positive refractive power with its convex surface oriented to the object, and cemented with the biconcave lens piece L 13 , all the lens pieces being arranged in this order from the closest to the object in the foremost position to the farthest in the rearmost position.
  • the fourth lens group G 4 comprises a biconvex lens piece L 15 , and a duplet of a biconvex lens piece L 16 and a lens piece L 17 of negative refractive power cemented with the lens piece L 16 , all the lens pieces being arranged in this order from the closest to the object in the foremost position to the farthest from the object in the rearmost position.
  • the fifth lens group G 5 comprises a lens piece L 18 of negative refractive power with its convex surface oriented toward the object, and a duplet of a biconcave lens piece L 19 and a biconvex lens piece L 20 cemented with the lens piece L 19 , all the lens pieces being arranged in this order on the basis of the foremost first.
  • the fifth embodiment of the zoom lens has its first lens group moved toward the object, its second lens group held in a fixed position, its third lens group moved on a trajectory that draws an are toward the imaging plane relative to the second lens group, its fourth lens group moved on a trajectory that draws an are toward the imaging plane relative to the third lens group, and its fifth lens group moved toward the object.
  • the fourth lens group For focusing on an object at the near point, the fourth lens group are moved toward the object.
  • the duplet of the cemented lens pieces L 13 and L 14 are moved in directions normal to the optical axis so as to correct fuzziness of an image during photographing.
  • Optical data of the fifth embodiment of the zoom lens are provided in Table 13.
  • Embodiment 1 2 3 4 5 X1/fT - formula (1) 0.1336 0.1326 0.1335 0.1347 0.1623 f1/ ⁇ (fw ⁇ fT) - formula 0.7965 0.8312 0.8788 0.8265 0.9242 (2) f3/ ⁇ (fw ⁇ fT) - formula 0.3005 0.2462 0.2541 0.2665 0.2616 (3) (1 ⁇ ⁇ a) ⁇ ⁇ b - formula ⁇ 1.2043 ⁇ 1.5548 ⁇ 1.2205 ⁇ 1.4781 ⁇ 1.4517 (4) Lt/fT - formula (5) 0.6207 0.6457 0.7213 0.6509 0.6479

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
  • Nonlinear Science (AREA)
  • Studio Devices (AREA)
  • Adjustment Of Camera Lenses (AREA)
US14/141,011 2012-12-27 2013-12-26 Zoom lens and camera device Abandoned US20140184884A1 (en)

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JP6519229B2 (ja) * 2015-02-27 2019-05-29 株式会社ニコン 撮影レンズ、撮影レンズを備えた光学機器、撮影レンズの製造方法
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JP6865134B2 (ja) * 2017-08-08 2021-04-28 株式会社タムロン ズームレンズ及び撮像装置
JP7085873B2 (ja) * 2018-02-16 2022-06-17 株式会社タムロン ズームレンズ及び撮像装置
JP6779936B2 (ja) * 2018-04-02 2020-11-04 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
CN108873277B (zh) * 2018-08-17 2021-06-01 福建福光股份有限公司 一种紧凑型广角大变倍比高清变焦镜头
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US10545321B2 (en) 2020-01-28
JP2014126851A (ja) 2014-07-07
US20170082841A1 (en) 2017-03-23
US10359611B2 (en) 2019-07-23

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