WO2001027677A1 - Objectif zoom et camera video le comprenant - Google Patents

Objectif zoom et camera video le comprenant Download PDF

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Publication number
WO2001027677A1
WO2001027677A1 PCT/JP2000/007061 JP0007061W WO0127677A1 WO 2001027677 A1 WO2001027677 A1 WO 2001027677A1 JP 0007061 W JP0007061 W JP 0007061W WO 0127677 A1 WO0127677 A1 WO 0127677A1
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WIPO (PCT)
Prior art keywords
lens
lens group
equation
zoom lens
satisfied
Prior art date
Application number
PCT/JP2000/007061
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English (en)
Japanese (ja)
Inventor
Katsu Yamada
Syuusuke Ono
Hisayuki Ii
Original Assignee
Matsushita Electric Industrial Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP29295699A external-priority patent/JP2001117004A/ja
Priority claimed from JP2000034011A external-priority patent/JP2001221948A/ja
Application filed by Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Publication of WO2001027677A1 publication Critical patent/WO2001027677A1/fr

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Classifications

    • 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
    • G02B15/144113—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 +-++

Definitions

  • the present invention relates to a zoom lens and a video camera using the same. More particularly, the present invention relates to a compact aspherical zoom lens having a camera shake correction function having an angle of view at a wide-angle end of 62 degrees or more and a video camera using the same.
  • Background art
  • Japanese Patent Application Laid-Open No. Heisei 9-2181392 discloses that high-quality images have an angle of view at the wide-angle end of 59.2 degrees to 60.7 degrees and a zoom ratio of about 10 times.
  • a zoom lens is disclosed.
  • the zoom lens disclosed in the above-mentioned publication achieves miniaturization and high image quality with a lens configuration as small as 10 sheets, but the angle of view at the wide-angle end is about 61 degrees or less.
  • the present invention has been made in order to solve the above-mentioned problems in the prior art, and has various lens aberrations including chromatic aberrations, with a small lens configuration, and has an angle of view of 62 degrees or more, and
  • An object of the present invention is to provide a zoom lens having a camera shake correction function, and to provide a small, high-quality video camera using the zoom lens.
  • a first configuration of a zoom lens according to the present invention has a positive refractive power, which is arranged in order from the object side to the image plane side, and is fixed to the image plane.
  • One lens group, a second lens group that has negative refractive power and performs zooming by moving on the optical axis, an aperture fixed with respect to the image plane, and a positive refractive power A third lens group, and a fourth lens group having a positive refractive power and moving on the optical axis such that the image plane, which fluctuates due to the movement of the second lens group and the object, is kept at a fixed position from the reference plane.
  • the second lens group includes three lenses, two negative lenses and one positive lens, and includes at least one aspherical surface.
  • the three lens group consists of three lenses, two positive lenses and one negative lens, and at least
  • the fourth lens unit includes a positive lens including at least one aspherical surface, and the fourth lens group includes at least one aspherical surface.
  • the third lens group is composed of three lenses, two positive lenses and one negative lens, so that the zoom lens is small and has a wide range from the wide-angle end to the standard position. A zoom lens in which spherical aberration is well corrected is realized.
  • each of the second to fourth lens groups by arranging at least one aspherical surface in each of the second to fourth lens groups with a small lens diameter and adopting the optimal aspherical shape and lens type, a small lens configuration is possible. It is possible to realize a compact zoom lens having an angle of view equal to or greater than degrees and various aberrations including chromatic aberration being satisfactorily corrected.
  • the lenses constituting the second to fourth lens groups all have small lens diameters, the aspherical lenses included in these lens groups are included. Can be easily manufactured.
  • the second lens group includes a first negative lens, a second negative lens, and a positive lens that are sequentially arranged from an object side. It is preferable that it is constituted by three lenses including a lens.
  • the second lens group includes a first negative lens, a second negative lens, and a positive lens, which are arranged in order from the object side.
  • it is composed of three lenses.
  • the third lens group includes a first positive lens, a second positive lens, and a negative lens which are arranged in order from the object side. It is preferable that it is constituted by three lenses including a lens.
  • the third lens group includes a first positive lens, a second positive lens, and a negative lens, which are arranged in order from the object side.
  • it is composed of three lenses.
  • the amount of movement of the second lens group can be reduced while the field curvature is further reduced.
  • the second lens group includes a first negative lens, a second negative lens, and a positive lens, which are arranged in order from the object side.
  • the second negative lens has an aspherical surface on the object side, has a local radius of curvature near the optical axis of the aspherical surface of R 10, and an outer periphery of the aspherical surface.
  • the local radius of curvature of the part is R 11, it is preferable that the following (Equation 3) is satisfied.
  • coma can be favorably corrected on the wide-angle side, and spherical aberration can be favorably corrected on the telephoto side.
  • Equation 4 it is preferable that the following condition (Equation 4) is satisfied.
  • the object-side surface of the lens closest to the object that forms the third lens group is an aspheric surface, and the vicinity of the optical axis of the aspheric surface Assuming that the local radius of curvature is R 20 and the local radius of curvature of the outer peripheral portion of the aspheric surface is R 21, it is preferable that the following condition (Equation 7) is satisfied.
  • the spherical aberration generated by the axial marginal ray can be corrected, so that the flare generated near the center of the screen can be satisfactorily corrected.
  • the absolute value of the radius of curvature of the image side surface of the concave lens included in the third lens group is R 30, and the focal length of the third lens group is f 3 In this case, it is preferable that the following condition (Equation 9) is satisfied. [Number 9]
  • inward coma which is a flare component, can also be satisfactorily corrected.
  • a back focus in which a crystal filter, an IR cut filter, and the like can be inserted can be secured, and a zoom lens that can be downsized can be realized.
  • the following condition (Equation 12) is satisfied.
  • f 4 fw is less than 2.4, the assembly tolerance may become tight even if a crystal filter or IR cut filter can be inserted.
  • f 4Zf w is 2.9 or more, the distance between the third lens unit and the fourth lens unit becomes narrow because the moving amount of the fourth lens unit increases, and similarly, the assembly tolerance may become tight. is there.
  • the fourth lens When the object-side surface of the lens group is an aspheric surface, the local radius of curvature near the optical axis of the aspheric surface is R 40, and the local radius of curvature of the outer peripheral portion of the aspheric surface is R 41. It is preferable that the following condition (Equation 13) is satisfied.
  • the aperture diameter of the aperture decreases with an increase in the focal length of the entire system, and the aperture diameter at the telephoto end is St, and the aperture diameter at the wide-angle end is Assuming that S w, it is preferable that the following condition (Equation 14) is satisfied.
  • deterioration of aberration at the long focal length side, particularly at the telephoto end, can be reduced.
  • deterioration of the optical performance of the zoom lens during zooming can be reduced by adjusting the aberration performance of each lens unit.
  • moving the entire lens group that has the same optical performance reduces camera shake with less aberration degradation.
  • a zoom lens with functions can be realized.
  • the amount of movement of the third lens group at the focal length f of the entire system at the time of camera shake correction is Y
  • the amount of movement of the third lens group at the telephoto end is Yt
  • the focal length at the telephoto end is ft.
  • a first configuration of the video camera of the present invention is a video camera provided with a zoom lens, wherein the first configuration of the zoom lens of the present invention is used as the zoom lens.
  • the second configuration of the zoom lens of the present invention is arranged in order from the object side to the image plane side.
  • a fourth lens unit that moves on the optical axis so as to keep the lens unit at a fixed position from the first lens unit, wherein the second lens unit includes a first negative lens, which is arranged in order from the object side, The three lenses consisting of the second negative lens and the cemented lens of the positive lens
  • the third lens group includes at least one aspheric surface, and the third lens group includes a first positive lens arranged in order from the object side, a refractive index of 1.55 or less, and a refractive index of 65 or more.
  • the fourth lens group includes at least one aspherical surface.
  • a third configuration of the zoom lens of the present invention includes a first lens group, which is arranged in order from the object side, has a positive refractive power and is fixed with respect to an image plane, and a negative refractive power.
  • a second lens group having a zooming effect by moving on the optical axis, a stop fixed to the image plane, a third lens group having a positive refractive power, and a positive refraction.
  • a fourth lens group having a power and moving on the optical axis so as to keep the image plane, which fluctuates due to the movement of the object, at a fixed position from the reference plane.
  • the second lens group is composed of three lenses including a first negative lens and a cemented lens of a second negative lens and a positive lens, which are arranged in order from the object side. , Including at least one aspherical surface, wherein the third lens group is arranged in order from the object side, A positive lens, a second positive lens having a refractive index of 1.55 or less and an Abbe number of 65 or more, and a negative lens, and at least one surface
  • the fourth lens group includes at least one aspherical surface.
  • a fourth configuration of the zoom lens according to the present invention includes a first lens group, which is arranged in order from the object side, has a positive refractive power and is fixed with respect to an image plane, and has a negative refractive power.
  • a second lens group having a zooming effect by moving on the optical axis, a stop fixed to the image plane, a third lens group having a positive refractive power, and a positive refraction.
  • a fourth lens group having a power and moving on the optical axis so as to keep the image plane, which fluctuates due to the movement of the object, at a fixed position from the reference plane.
  • the second lens group includes at least three lenses including a first negative lens, a second negative lens, and a positive lens, which are arranged in order from the object side.
  • the third lens group includes one aspherical surface, and the third lens group is arranged in order from the object side.
  • a first positive lens and a second positive lens having a refractive index of 1.55 or less and an Abbe number of 65 or more are provided.
  • at least one aspherical surface, and the fourth lens group includes at least one aspherical surface.
  • the zoom lenses by optimizing the lens type, the arrangement of the aspheric surfaces, and the shape of the aspheric surfaces, various aberrations including chromatic aberration can be reduced with a lens configuration as small as 10 lenses. Correction can be made well.
  • the diameters of the lenses constituting the second lens group, the third lens group, and the fourth lens group are all small, aspheric lenses included in these lens groups can be easily manufactured.
  • the third lens group is composed of three lenses, two positive lenses and one negative lens, it is compact and has good spherical aberration from the wide-angle end to the standard position. Thus, a corrected zoom lens can be realized.
  • the condition that the second positive lens constituting the third lens group has a refractive index of 1.55 or less and an Abbe number of 65 or more provides good axial color difference and field curvature over the entire zoom range. It is effective in correcting to.
  • the object-side surface of the second negative lens forming the second lens group is an aspheric surface, and the aspheric surface is provided.
  • the local radius of curvature near the optical axis is R 10 and the local radius of curvature of the outer peripheral portion of the aspheric surface is R 11, it is preferable that the following condition (Equation 20) is satisfied.
  • the focal length of the entire system at the wide-angle end is fw, the first positive lens that forms the third lens group, and
  • the air gap between the positive lens and the second positive lens is d 31, it is preferable that the following condition (Equation 24) is satisfied.
  • axial chromatic aberration can be further favorably corrected.
  • the object-side surface of the lens closest to the object that constitutes the third lens group is an aspheric surface
  • the local radius of curvature near the optical axis of the aspherical surface is R 20
  • the local radius of curvature of the outer peripheral portion of the aspherical surface is R 21, it is preferable that the following condition is satisfied. .
  • the absolute value of the radius of curvature of the image side surface of the concave lens included in the third lens group is R 30, and the third lens
  • the focal length of the group is f3
  • the object-side surface of the fourth lens unit is an aspheric surface, and the local curvature of the aspheric surface near an optical axis is provided.
  • the radius is R 40 and the local radius of curvature of the outer peripheral portion of the aspheric surface is R 41, it is preferable that the following condition (Equation 3 2) is satisfied.
  • the stop diameter of the stop decreases as the focal length of the entire system increases, and the stop diameter at the telephoto end is S.
  • the stop diameter at the telephoto end is S.
  • the entire third lens group is perpendicular to the optical axis in accordance with the shake amount obtained from the shake amount detector. It is preferable to have a function of correcting the movement of the image due to camera shake by moving the camera in the direction indicated by the arrow. According to this preferred example, Compared to the type that moves some lenses inside the lens group perpendicularly to the optical axis, a zoom lens with a camera shake correction function that causes less aberration deterioration by moving the entire lens group that has the same optical performance Can be realized.
  • the amount of movement of the third lens group at the focal length f of the entire system at the time of camera shake correction is Y
  • the amount of movement of the third lens group at the telephoto end is Yt
  • the focal length at the telephoto end is Yt.
  • a second configuration of the video camera according to the present invention is a video camera equipped with a zoom lens, wherein any one of the second to fourth configurations of the zoom lens according to the present invention is used as the zoom lens. It is characterized by. According to the second configuration of the video camera, a small-sized and wide-angle video camera can be realized.
  • FIG. 1 is an arrangement diagram illustrating a configuration of a zoom lens according to a first embodiment of the present invention.
  • FIG. 2 is an arrangement diagram illustrating a configuration of a zoom lens according to a second embodiment of the present invention.
  • FIG. 3 is an arrangement diagram showing a configuration of a zoom lens according to a third embodiment of the present invention.
  • FIG. 4 is an arrangement diagram showing a configuration of a zoom lens having a camera shake correction function according to a fourth embodiment of the present invention.
  • FIG. 5 is a layout diagram showing a configuration of a video camera according to the fifth embodiment of the present invention.
  • FIG. 6 is an aberration performance diagram at the wide-angle end according to the first embodiment of the present invention.
  • FIG. 7 is an aberration diagram at a standard position of the zoom lens according to the first embodiment of the present invention.
  • FIG. 8 is an aberration performance diagram at the telephoto end of the zoom lens according to the first embodiment of the present invention.
  • FIG. 9 is an aberration performance diagram at the telephoto end of the zoom lens according to Embodiment 1 of the present invention at the time of 0.3-degree camera shake correction.
  • FIG. 10 is an aberration performance diagram at the wide-angle end of the zoom lens according to Embodiment 2 of the present invention.
  • FIG. 11 is an aberration performance diagram at a standard position of the zoom lens according to the second embodiment of the present invention.
  • FIG. 12 is an aberration diagram at the telephoto end of the zoom lens according to the second embodiment of the present invention.
  • FIG. 13 is an aberration performance diagram at the telephoto end of the zoom lens according to Embodiment 2 of the present invention at the time of 0.3-degree camera shake correction.
  • FIG. 14 is an aberration performance diagram at the wide-angle end of the zoom lens according to Embodiment 3 of the present invention.
  • FIG. 15 is an aberration performance diagram at a standard position of the zoom lens according to the third embodiment of the present invention.
  • FIG. 16 shows aberration performance at the telephoto end of the zoom lens according to Embodiment 3 of the present invention.
  • FIG. 17 is an aberration performance diagram at the telephoto end of the zoom lens according to Embodiment 3 of the present invention at the time of 0.3-degree camera shake correction.
  • FIG. 18 is an aberration diagram at the wide-angle end of the zoom lens according to Example 4 of the present invention.
  • FIG. 19 is an aberration performance diagram at a standard position of the zoom lens according to Embodiment 4 of the present invention.
  • FIG. 20 is an aberration performance diagram at the telephoto end of the zoom lens according to Embodiment 4 of the present invention.
  • FIG. 21 is an aberration performance diagram at the telephoto end of the zoom lens according to Embodiment 4 of the present invention at the time of 0.3-degree camera shake correction.
  • FIG. 22 is an aberration diagram at the wide-angle end of the zoom lens according to Example 5 of the present invention.
  • FIG. 23 is an aberration performance diagram at a standard position of the zoom lens according to Example 5 of the present invention.
  • FIG. 24 is an aberration performance diagram at the telephoto end of the zoom lens according to Embodiment 5 of the present invention.
  • FIG. 25 is an aberration performance diagram at the time of correcting a camera shake by 0.3 degrees at the telephoto end of the zoom lens according to Embodiment 5 of the present invention.
  • FIG. 26 is an aberration diagram at the wide-angle end of the zoom lens according to Embodiment 6 of the present invention.
  • FIG. 27 is an aberration performance diagram at a standard position of the zoom lens according to Embodiment 6 of the present invention.
  • FIG. 28 is an aberrational diagram at the telephoto end of the zoom lens according to Embodiment 6 of the present invention.
  • FIG. 29 shows 0.3 degrees at the telephoto end of the zoom lens according to Embodiment 6 of the present invention.
  • FIG. 9 is an aberration performance diagram at the time of camera shake correction.
  • FIG. 30 is an aberrational diagram at the wide-angle end of the zoom lens according to Embodiment 7 of the present invention.
  • FIG. 31 is an aberration performance diagram at a standard position of the zoom lens according to Embodiment 7 of the present invention.
  • FIG. 32 is an aberrational diagram at the telephoto end of the zoom lens according to Embodiment 7 of the present invention.
  • FIG. 33 is an aberration performance diagram of the zoom lens according to Embodiment 7 of the present invention at the telephoto end at the time of 0.3-degree camera shake correction.
  • FIG. 34 is an aberration diagram at the wide-angle end of the zoom lens according to Embodiment 8 of the present invention.
  • FIG. 35 is an aberration performance diagram at a standard position of the zoom lens according to Embodiment 8 of the present invention.
  • FIG. 36 is an aberrational diagram at the telephoto end of the zoom lens according to Embodiment 8 of the present invention.
  • FIG. 37 is an aberration performance diagram at the time of correcting a camera shake by 0.3 degrees at the telephoto end of the zoom lens according to Embodiment 8 of the present invention.
  • FIG. 38 is an aberration diagram at the wide-angle end of the zoom lens according to Embodiment 9 of the present invention.
  • FIG. 39 is an aberration performance diagram at a standard position of the zoom lens according to Embodiment 9 of the present invention.
  • FIG. 40 is an aberration diagram at the telephoto end of a zoom lens according to Embodiment 9 of the present invention.
  • FIG. 41 is an aberration performance diagram at the telephoto end of the zoom lens according to Embodiment 9 of the present invention at the time of 0.3-degree camera shake correction.
  • FIG. 42 shows aberrations at the wide-angle end of the zoom lens according to the tenth embodiment of the present invention. It is a Noh figure.
  • FIG. 43 is an aberration performance diagram at a standard position of the zoom lens according to Example 10 of the present invention.
  • FIG. 44 is an aberrational performance diagram at the telephoto end of the zoom lens according to the tenth embodiment of the present invention.
  • FIG. 45 is an aberration performance diagram at the telephoto end of the zoom lens of Embodiment 10 of the present invention at the time of 0.3-degree camera shake correction.
  • FIG. 1 is an arrangement diagram illustrating a configuration of a zoom lens according to a first embodiment of the present invention.
  • the zoom lens according to the present embodiment includes a first lens group arranged in order from the object side (the left side in FIG. 1) to the image plane 17 side (the right side in FIG. 1). 1 1, 2nd lens group 1 2, aperture 15, 3rd lens group 1 3, 4th lens group 1 4, optical aperture and single pass filter. Equivalent to filter and CCD face plate It is composed of a flat plate 16.
  • the first lens group 11 has a positive refractive power, and is fixed with respect to the image plane 17 both during zooming and during focusing.
  • the second lens group 12 is composed of three lenses including a first negative lens and a cemented lens of a second negative lens and a positive lens arranged in order from the object side. It has a negative refractive power.
  • the second lens group 12 is a lens group that performs a zooming action by moving on the optical axis.
  • the third lens group 13 includes three lenses including a first positive lens and a cemented lens of a second positive lens and a negative lens, which are arranged in order from the object side. During zooming and focusing, it is fixed with respect to the image plane 17.
  • the fourth lens group 14 is composed of a single lens having a positive refractive power, and keeps the second lens group 12 and the image plane 17 that fluctuates due to the movement of the object at a fixed position from the reference plane. Move on the optical axis. That is, the fourth lens group 14 simultaneously moves the image by zooming and adjusts the focus by moving on the optical axis.
  • the second positive lens constituting the third lens group preferably has a refractive index of 1.55 or less and an Abbe number of 65 or more. By satisfying these conditions, it is possible to satisfactorily correct axial chromatic aberration and field curvature over the entire zoom range.
  • Equation 37 is a conditional expression regarding the power of the second lens group 12. I 2
  • the object-side surface of the second negative lens constituting the second lens group 12 is an aspheric surface, the local radius of curvature near the optical axis of the aspheric surface is R 10, and the outer peripheral portion of the aspheric surface Let R 11 be the local radius of curvature of It is desirable that the conditions be satisfied.
  • Equation 41 is a conditional expression regarding the power of the third lens group 13.
  • f3 / fw becomes 2.5 or less, a back focus in which a crystal filter, an IR cut filter, and the like can be inserted. It is difficult to secure Also, when f 3Zfw exceeds 4.0, the overall length becomes long, and it is difficult to realize a small zoom lens. Further, by satisfying the following condition (Equation 42), it is possible to secure an air gap enough to insert a crystal filter or an IR cut filter while maintaining good field curvature. [Number 42]
  • the third lens group 13 includes three lenses including two positive lenses and one negative lens. With this lens configuration, it is possible to realize a zoom lens that is small and that has a good correction of spherical aberration from the wide-angle end to the standard position.
  • the object-side surface of the lens located closest to the object and constituting the third lens group 13 is an aspheric surface
  • the local radius of curvature near the optical axis of the aspheric surface is R 20
  • the aspheric surface When the local radius of curvature of the outer peripheral portion is R 21, it is desirable that the following condition (Equation 45) is satisfied.
  • Equation 45 is a conditional expression relating to the aspherical surface of the object-side surface of the lens located closest to the object side, which constitutes the third lens unit 13, and has a favorable spherical aberration. Defines the range to be corrected. When 1 ⁇ 2 1! ⁇ 20 is less than 1.05, negative spherical aberration occurs, and when R2 1ZR20 exceeds 2.0, overcorrection results in positive spherical aberration. . Furthermore, by satisfying the following condition (Equation 46), it is possible to correct the spherical aberration generated by the on-axis marginal ray, so that the flare generated near the center of the screen can be corrected well. it can.
  • Equation 47 defines the range in which the coma of the light beam outside the principal ray of the off-axis light is favorably corrected. ! ⁇ 3 0 / / 3 When becomes 0.6 or more, frames of inward occurs at zooming intermediate position, when R 3 0 3 is 0.3 5 or less, the frame outward occurs. Further, by satisfying the following condition (Equation 48), inward coma aberration, which is a flare component, can be corrected well.
  • Equation 49 2.3 ⁇ f 4 / f w ⁇ 3.0 (Equation 49) above is a conditional expression for the power of the fourth lens group 14.
  • ⁇ f 4Z fw is 2.3 or less, the back focus that can introduce a crystal filter, an IR cut filter, and the like is set. It is difficult to secure. If f 4 / fw is 3.0 or more, the amount of movement of the fourth lens group 14 during focusing becomes large, and it is difficult to realize a small zoom lens. Further, it is desirable to satisfy the following condition (Equation 50).
  • f 4Z f w is 2.4 or less, the assembly tolerance may become tight even if a crystal filter or an IR cut filter can be inserted.
  • f4 / fw is 2.9 or more, the distance between the third lens group and the fourth lens group is reduced due to an increase in the amount of movement of the fourth lens group. There is.
  • the object-side surface of the lens of the fourth lens group 14 is an aspheric surface, and the local radius of curvature near the optical axis of the aspheric surface is R 40, and the local radius of curvature of the outer peripheral portion of the aspheric surface is R When 41 is set, it is desirable that the following condition (Equation 51) is satisfied.
  • Equation 29 is a conditional expression relating to the aspherical surface of the object-side surface of the fourth lens group 14, and defines the range in which the coma of the light flux inside the principal ray of the off-axis light is favorably corrected. Things. When the length is 140 or less, an inward frame is generated, and when the R41ZR40 is 1.6 or more, an outward frame is generated.
  • the amount of movement of the third lens group 13 (correction lens) at the focal length f of the entire system at the time of camera shake correction is Y
  • the amount of movement of the third lens group 13 (correction lens) at the telephoto end is Yt
  • the focal length at the end is ft, it is desirable that the following conditions (Equation 53) and (Equation 54) are satisfied.
  • Equation 53 and (Equation 54) are conditional expressions relating to the amount of movement of the third lens group 13 (correction lens).
  • the zoom ratio when the correction angle is constant over the entire zoom range, the larger the zoom ratio, the larger the amount of movement of the correction lens, and conversely, the smaller the zoom ratio, the smaller the amount of movement of the correction lens. If the values deviate from the limits of (Equation 53) and (Equation 54), the correction will be excessive and the deterioration of the optical performance including monochromatic aberration will increase.
  • Equation 54 mainly specifies the upper limit of the camera shake on the wide-angle side.
  • (YZY t) Z (f / ft) becomes 1.5 or more, the correction becomes excessive, and the deterioration of the optical performance is reduced. growing. Also, the screen after correction will be unnatural.
  • FIG. 2 is an arrangement diagram illustrating a configuration of a zoom lens according to a second embodiment of the present invention.
  • the zoom lens according to the present embodiment includes a first lens group 2 arranged in order from the object side (the left side in FIG. 2) to the image plane 27 side (the right side in FIG. 2). 1, a second lens group 22, an aperture 25, a third lens group 23, a fourth lens group 24, and a flat plate 26 equivalent to an optical low-pass filter and a CCD face plate Has been done.
  • the first lens group 21 has a positive refractive power, and is fixed with respect to the image plane 27 both during zooming and during focusing.
  • the second lens group 22 is composed of three lenses including a first negative lens and a cemented lens of a second negative lens and a positive lens, which are arranged in order from the object side. It has a negative refractive power. This second lens group 22 moves on the optical axis. This is a lens group that performs a zooming action by moving.
  • the third lens group 23 is composed of three lenses including a first positive lens, a second positive lens, and a negative lens arranged in order from the object side. Sometimes it is fixed relative to the image plane 27.
  • the fourth lens group 24 is composed of one lens having a positive refractive power, and the second lens group 22 and the image plane 27 that fluctuates due to the movement of the object are located at a fixed position from the reference plane. Move on the optical axis to keep. That is, the fourth lens group 24 simultaneously moves the image by zooming and adjusts the force by moving on the optical axis.
  • the second positive lens forming the third lens group 23 preferably has a refractive index of 1.55 or less and an Abbe number of 65 or more. Also, it is desirable that the conditions of (Equation 37) to (Equation 55) are satisfied.
  • FIG. 3 is an arrangement diagram showing a configuration of a zoom lens according to a third embodiment of the present invention.
  • the zoom lens according to the present embodiment includes a first lens group arranged in order from the object side (the left side in FIG. 3) to the image plane 37 side (the right side in FIG. 3).
  • the first lens group 31 has a positive refractive power, and is fixed with respect to the image plane 37 both during zooming and during focusing.
  • the second lens group 32 is composed of three lenses including a first negative lens, a second negative lens, and a positive lens arranged in order from the object side. Has bending power. This second lens group 32 moves along the optical axis. Therefore, it is a lens group that performs a zooming action.
  • the third lens group 33 is composed of three lenses including a first positive lens and a cemented lens of a second positive lens and a negative lens arranged in order from the object side. At the time of doubling and focusing, it is fixed with respect to the image plane 37.
  • the fourth lens group 34 is composed of a single lens having a positive refractive power.
  • the second lens group 32 and the image plane 37 that fluctuates due to the movement of the object are fixed at a certain position from the reference plane.
  • the fourth lens group 34 simultaneously moves the image by zooming and adjusts the force by moving on the optical axis.
  • the second positive lens constituting the third lens group 33 preferably has a refractive index of 1.55 or less and an Abbe number of 65 or more. Also, it is desirable that the conditions of (Equation 37) to (Equation 55) are satisfied.
  • FIG. 4 is an arrangement diagram showing a configuration of a zoom lens having a camera shake correction function according to a fourth embodiment of the present invention.
  • the first lens group 41 and the second lens constituting the zoom lens according to the first to third embodiments.
  • a group 42, an aperture 45, a third lens group 43, a fourth lens group 44, a flat plate 46 equivalent to an optical low-pass filter, and an imaging element 47 are arranged in this order.
  • a detector 48 is connected to the third lens group 43 via a driving device 49 having a driving circuit.
  • the detector 48 detects a camera shake amount.
  • the driving device 49 moves the third lens group 43 in two directions perpendicular to the optical axis. As a result, it is possible to realize a zoom lens having a small and high-precision camera shake correction function.
  • FIG. 5 is a layout diagram showing a configuration of a video camera according to the fifth embodiment of the present invention.
  • the video camera according to the present embodiment includes the zoom lens 51, the image sensor 52, and the signal processing circuit 53 according to the first to fourth embodiments. As a result, a small and wide-angle video camera can be realized.
  • Table 1 shows specific examples of the zoom lens according to the first embodiment.
  • r (mm) is the radius of curvature of the lens
  • d (mm) is the thickness of the lens or the air gap of the lens
  • n is the bending of each lens with respect to the d-line.
  • the refractive index and the re are the Abbe numbers of each lens with respect to the d-line, respectively (the same applies to Examples 2 to 10 below).
  • the aspherical shape is defined by the following (Equation 56) (the same applies to the following Examples 2 to L0).
  • SAG Distance from the aspherical vertex to the point on the aspheric surface at height H from the optical axis
  • H Height from optical axis
  • R radius of curvature of aspherical vertex
  • Table 3 shows the values when the object point is located 2 m from the lens tip as an example of the air gap that can be changed by zooming. ⁇ Also, the following Table 3 shows the focus. Shows the aperture diameter that changes with distance. [Table 3]
  • the standard position is the position where the third lens group 13 and the fourth lens group 14 come closest to each other.
  • F, FZN ⁇ , and ⁇ (degrees) represent the focal length, F-number, and half angle of incidence at the wide-angle end, standard position, and telephoto end of the zoom lens shown in Table 1 above.
  • the angle of view at the wide-angle end in this embodiment is 65.60 degrees.
  • the second positive lens of the third lens group 13 has a refractive index of 1.55 or less and an Abbe number of 65 or more.
  • axial chromatic aberration and field curvature over the entire zoom range are well corrected.
  • the zoom lens according to the present embodiment includes three lenses including a first negative lens, and a cemented lens of a second negative lens and a positive lens, in which the second lens group 12 is arranged in order from the object side. Lens.
  • the object-side surface of the second negative lens is an aspheric surface, and in particular, a local radius of curvature R 10 near the optical axis of the aspheric surface and a local radius of curvature R 11 of the outer peripheral portion of the aspheric surface Have the values shown in the above (Table 4), and the conditional expression (Equation 39) is satisfied.
  • the coma on the wide-angle side and the spherical aberration on the telephoto side are satisfactorily corrected.
  • the zoom lens in the present embodiment is as shown in the above (Table 4).
  • the focal length f3 of the third lens group 13 satisfies the above (Equation 41), and a small zoom lens with a back focus that can insert a crystal filter or IR cut filter is realized. ing.
  • the third lens group 13 is composed of three lenses including a first positive lens and a cemented lens of a second positive lens and a negative lens, and is compact and compact.
  • a zoom lens in which the spherical aberration from the wide-angle end to the standard position is satisfactorily corrected is realized.
  • the air distance d 31 between the first positive lens and the second positive lens constituting the third lens group 13 and the focal length fw of the entire system at the wide-angle end. Have the values shown in the above (Table 4), and the above (Equation 43) is satisfied. As a result, axial chromatic aberration is favorably corrected while maintaining a manufacturable lens interval.
  • both surfaces of the lens which is the most object side of the third lens group 13 are aspherical surfaces.
  • the local radius of curvature R 20 and the local radius of curvature R 21 of the outer periphery of the aspheric surface have the values shown in the above (Table 4), and the above (Equation 45) is satisfied. As a result, spherical aberration over the entire zoom range is successfully corrected.
  • the absolute value R 30 of the radius of curvature of the image side surface of the concave lens included in the third lens group 13 and the focal length f 3 of the third lens group 13 are as shown in the above table. It has the value shown in 4) and satisfies the above (Equation 47). As a result, the coma of the light beam outside the principal ray of the off-axis light is satisfactorily corrected.
  • the focal length f 4 of the fourth lens group 14 satisfies the above (Equation 49), and a crystal filter, an IR cut filter, etc. Can insert a back A small zoom lens with a secured focus has been realized.
  • the object-side surface of the lens of the fourth lens unit 14 is an aspheric surface, and the local radius of curvature R 40 near the optical axis of the aspheric surface and the aspheric surface.
  • the local radius of curvature R 41 of the outer peripheral portion of the spherical surface has the value shown in the above (Table 4), and the above (Equation 51) is satisfied. As a result, the coma of the light beam inside the principal ray of the off-axis light is favorably corrected.
  • the stop diameter of the stop 15 fixed with respect to the image plane provided on the object side of the third lens group 13 is, as shown in (Table 3) above, It decreases with an increase in the focal length of the system, and the ratio between the aperture diameter St at the telephoto end and the aperture diameter Sw at the wide-angle end has the value shown in Table 4 above. That is, the above (Equation 52) is satisfied, and the aberration at the long focal length side, particularly at the telephoto end, is favorably corrected.
  • the entire third lens group 13 is moved perpendicularly to the optical axis to correct the image fluctuation at the time of camera shake, and the chromatic aberration during correction is small. It is suppressed.
  • the movement amount Y of the third lens group 13 (correction lens) at the wide-angle end, the standard position, and the telephoto end and the focal length f of the entire system are calculated as shown in Table 4 above. This satisfies the above (Equation 53) and (Equation 54), whereby deterioration of various aberrations at the time of correction is suppressed to a small value.
  • FIG. 6 to 8 show aberration performance diagrams of the zoom lens shown in (Table 1) at the wide-angle end, the standard position, and the telephoto end.
  • (a) is a diagram of spherical aberration with respect to d-line.
  • (B) is a diagram of astigmatism, where a solid line indicates sagittal field curvature and a broken line indicates meridional field curvature.
  • (C) is a diagram of distortion
  • (d) is a diagram of axial chromatic aberration, a solid line shows a value for d-line, a short dashed line shows a value for F-line, and a long dashed line shows a value for C-line, respectively. ing.
  • (E) is a diagram of chromatic aberration of magnification.
  • the short dashed line shows the value for the F line
  • the long dashed line shows the value for the C line.
  • FIG. 9 shows an aberration performance chart at the telephoto end at the time of 0.3-degree camera shake correction.
  • (f) is the relative image height 0.75
  • (g) is the center of the screen
  • (h) shows a diagram of the lateral aberration at a relative image height of 0.75, respectively.
  • the solid line shows the value for the d line
  • the short dashed line shows the value for the F line
  • the long dashed line shows the value for the C line.
  • Table 5 below shows other specific examples of the zoom lens according to the first embodiment.
  • the first lens group 11, the second lens group 12, and the aperture 15 are omitted because they are the same as the above (Table 1) of the first embodiment.
  • the angle of view at the wide-angle end in this embodiment is 65.7 degrees.
  • the second positive lens of the third lens group 13 has a refractive index of 1.55 or less and an Abbe number of 65 or more. are doing.
  • the zoom lens according to the present embodiment satisfies the conditions of (Equation 37) to (Equation 55).
  • FIGS. 10 to 12 show aberration performance diagrams of the zoom lens shown in (Table 7) at the wide-angle end, the standard position, and the telephoto end.
  • Fig. 13 shows the aberration performance at the telephoto end at the time of 0.3-degree camera shake correction.
  • the zoom lens according to the present example shows good aberration performance.
  • Table 9 shows still another specific example of the zoom lens according to the first embodiment.
  • the first lens group 11, the second lens group 12, and the aperture 15 are omitted because they are the same as the above (Table 1) of the first embodiment.
  • Table 10 shows the aspherical shape of the zoom lens according to the present example.
  • the angle of view at the wide-angle end in this embodiment is 65.5 degrees.
  • the second positive lens of the third lens group 13 has a refractive index of 1.55 or less and an Abbe number of 65 or more. are doing.
  • the zoom lens according to the present embodiment satisfies the above-mentioned conditions (Formula 37) to (Formula 55).
  • Figures 14 to 16 show aberration performance charts of the zoom lens shown in (Table 11) at the wide-angle end, the standard position, and the telephoto end.
  • Fig. 17 shows the aberration performance at the telephoto end when correcting camera shake by 0.3 degrees. From Fig. 14 to Fig. 17 As can be seen, the zoom lens according to the present example shows good aberration performance.
  • Table 13 shows other specific examples of the zoom lens according to the first embodiment.
  • f (mm) and F / ⁇ (degrees) are the focal length, F-number, half-incidence at the wide-angle end, standard position, and telephoto end of the zoom lens in (Table 13) above. Is the corner.
  • the angle of view at the wide-angle end in this embodiment is about 64 degrees.
  • the zoom lens according to the present embodiment includes a first negative lens in which the second lens group 12 is arranged in order from the object side, and a second negative lens and a positive lens.
  • the second negative lens has an aspherical surface on the object side, has a local radius of curvature near the optical axis of R10, and has a local outer peripheral portion.
  • R11 radius of curvature
  • IR11IIR10I has the values shown in the following (Table 16).
  • f 3Z fw is shown in the following (Table 16). Have a value.
  • the object-side surface of the lens closest to the object side of the third lens group 13 is an aspheric surface
  • the local radius of curvature near the optical axis is R 20
  • R 21 / R 20 has the values shown in the following (Table 16).
  • the zoom lens according to the present embodiment has RS OZ fS has the value shown in the following (Table 16).
  • the zoom lens according to the present embodiment has a focal length of the fourth lens group 14.
  • f 4Z fw has the value shown in the following (Table 16).
  • the surface of the fourth lens unit 14 on the object side is aspheric, the local radius of curvature near the optical axis is R 40, and the local radius of curvature of the outer peripheral portion is R 40.
  • R41, R41ZR40 has the value shown in the following (Table 16).
  • the zoom lens according to the present embodiment has an aperture diameter of the aperture 15 fixed to the image plane 17 provided on the object side of the third lens group 13. Decreases as the focal length of the entire system increases, and when the stop diameter at the telephoto end is St and the stop diameter at the wide-angle end is Sw, the value of St /. Sw is as shown in Table 16 below. Have.
  • the zoom lens according to the present embodiment corrects image fluctuations due to camera shake by moving the entire third lens group 13 perpendicularly to the optical axis, thereby reducing the deterioration of chromatic aberration during correction. ing.
  • the zoom lens in this embodiment is configured such that the movement amount of the third lens group 13 (correction lens) at the focal length f of the entire system at the time of camera shake correction is Y, and the movement amount of the third lens group 13 at the telephoto end is Y.
  • Yt and the focal length at the telephoto end are ft, Y, Yt and (Y / Yt) Z (f / ft) are as follows (Table 16) Has the values shown in FIG.
  • Figures 18 to 20 show aberration performance diagrams at the wide-angle end, standard position, and telephoto end of the zoom lens shown in Table 13 above.
  • FIG. 21 shows an aberration performance diagram at the telephoto end at the time of 0.3-degree camera shake correction.
  • the zoom lens according to the present embodiment shows good aberration performance both at rest and when camera shake is corrected.
  • Table 18 shows the aspherical shape of the zoom lens in this example.
  • the following (Table 19) shows the values when the object point is 2 m from the lens tip as an example of the variable air spacing by zooming.
  • the following (Table 19) shows the aperture diameter that changes with the focal length.
  • the standard position in the following (Table 19) is the position where the third lens group 13 and the fourth lens group 14 are closest. It is.
  • f (mm), F / NO ⁇ (degrees) is the focal length, F-number, and half angle of incidence at the wide-angle end, the standard position, and the telephoto end of the zoom lens described in (Table 17).
  • the angle of view at the wide-angle end in this embodiment is about 65 degrees.
  • Table 20 shows values of I I2I ⁇ w and the like for the zoom lens of this example.
  • FIGS. 22 to 24 show aberration performance diagrams of the zoom lens shown in (Table 19) at the wide-angle end, the standard position, and the telephoto end.
  • Fig. 25 shows the aberration performance chart at the telephoto end when correcting camera shake by 0.3 degrees.
  • the zoom lens according to the present example shows good aberration performance both at rest and when camera shake is corrected.
  • the following (Table 23) shows the values when the object point is 2 m from the front of the lens as an example of the variable air spacing by zooming. Also, the following (Table 23) shows the aperture diameter that changes with the focal length.
  • the standard position in (Table 23) below is the position where the third lens group 13 and the fourth lens group 14 are closest. It is. Below (Table 23), ⁇ (mm), ⁇ / N ⁇ and ⁇ (degrees) are the focal length, F-number, and half angle of view at the wide-angle end and standard position.
  • the angle of view at the wide-angle end in this embodiment is about 63 degrees.
  • Table 24 shows values of I I2I / ⁇ ⁇ ⁇ ⁇ w and the like for the zoom lens of this example.
  • Figures 26 to 28 show aberration performance diagrams of the zoom lens shown in (Table 23) at the wide-angle end, the standard position, and the telephoto end.
  • Fig. 29 shows the aberration performance chart at the telephoto end when correcting camera shake by 0.3 degrees.
  • the zoom lens according to the present embodiment shows good aberration performance both at rest and when camera shake is corrected.
  • Table 26 shows the aspherical shape of the zoom lens in this example.
  • Table 27 shows the values when the object point is 2 m from the front of the lens as an example of the variable air spacing by zooming. Also, the following (Table 27) shows the aperture diameter that changes with the focal length. [Table 27]
  • the angle of view at the wide-angle end in this embodiment is 69.5 degrees.
  • the second positive lens of the third lens group 23 has a refractive index of 1.55 or less and an Abbe number of 65 or more. Have.
  • FIGS. 30 to 32 show aberration performance diagrams of the zoom lens shown in (Table 27) at the wide-angle end, the standard position, and the telephoto end.
  • FIG. 33 shows the aberration performance chart at the telephoto end when correcting 0.3-degree camera shake. As can be seen from FIG. 30 to FIG. 33, the zoom lens according to the present example shows good aberration performance.
  • Table 31 shows an example of an air gap that can be changed by zooming when the object point is 2 m from the lens tip. Also, the following (Table 31) shows the aperture diameter that changes with the focal length.
  • ⁇ The standard positions in the following (Table 31) are the third lens group 23 and the fourth lens group. 24 is the closest position.
  • f (mm), F / ⁇ , and ⁇ (degrees) are the focal length at the wide-angle end, the standard position, the telephoto end, the F-number, and the half-incidence of the zoom lens described in (Table 29). The angle of view.
  • the angle of view at the wide-angle end in this embodiment is about 69 degrees.
  • Table 32 shows values such as If2IIw for the zoom lens of this example.
  • Figures 34 to 36 show aberration performance diagrams of the zoom lens shown in (Table 31) at the wide-angle end, the standard position, and the telephoto end.
  • FIG. 37 shows the aberration performance chart at the telephoto end when correcting 0.3-degree camera shake.
  • the zoom lens according to the present example shows good aberration performance both at rest and when camera shake is corrected.
  • Table 35 shows the values when the object point is located 2 m from the lens tip as an example of the variable air spacing by zooming. Also, the following (Table 35) shows the aperture diameter that changes with the focal length. [Table 35]
  • the angle of view at the wide-angle end in this embodiment is 72.9 degrees.
  • the second positive lens of the third lens group 33 has a refractive index of 1.55 or less and an Abbe number of 65 or more. Have.
  • the zoom lens in this example satisfies the above-mentioned conditions (Expression 37) to (Expression 55).
  • Figures 38 to 40 show aberration performance charts of the zoom lens shown in (Table 35) at the wide-angle end, at the standard position, and at the telephoto end.
  • FIG. 41 shows an aberration performance chart at the telephoto end at the time of 0.3-degree camera shake correction. As can be seen from FIGS. 38 to 41, the zoom lens according to the present example shows good aberration performance.
  • Table 38 shows the aspherical shape of the zoom lens in this example.
  • Table 39 shows the values when the object point is 2 m from the front of the lens as an example of the variable air spacing by zooming. Also, the following (Table 39) shows the aperture diameter that changes with the focal length.
  • the standard position in the following (Table 39) is the position where the third lens group 33 and the fourth lens group 34 come closest.
  • f (mm), FX N ⁇ and ⁇ (degrees) are the focal length at the wide-angle end, the standard position, the telephoto end, the F-number, and the half angle of incidence of the zoom lens described in (Table 37).
  • the angle of view at the wide-angle end in this embodiment is about 73 degrees.
  • Table 40 shows values such as If2IIw for the zoom lens of this example.
  • Figures 42 to 44 show aberration performance diagrams of the zoom lens shown in (Table 39) at the wide-angle end, at the standard position, and at the telephoto end.
  • Fig. 45 shows the aberration performance chart at the telephoto end when correcting camera shake by 0.3 degrees.
  • the zoom lens according to the present embodiment exhibits good aberration performance both at rest and during camera shake correction. Industrial applicability
  • the zoom lens of the present invention can be used for a video camera and the like. According to the zoom lens of the present invention, various components including chromatic aberration can be achieved with a small lens configuration. Achieved a zoom lens with good aberration correction, an angle of view of 62 degrees or more, and a camera shake correction function, and a compact, high-quality video camera using this zoom lens. Can be realized.

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Abstract

L'invention porte sur un objectif zoom comprenant: un premier groupe de lentilles (11) à pouvoir de réfraction positif fixe par rapport au plan de l'image; un deuxième groupe de lentilles (12) à pouvoir de réfraction négatif et variation du pouvoir par déplacement le long de l'axe optique; un diaphragme (15) fixe par rapport au plan de l'image; un troisième groupe de lentilles (13) à pouvoir de réfraction positif; et un quatrième groupe de lentilles (14) à pouvoir de réfraction positif et mobile le long de l'axe optique de manière déplacer le plan de l'image (17) quand le deuxième groupe de lentilles (12) et l'objet se déplacent vers une position fixe à partir d'un plan de référence. Ces différents éléments sont disposés dans cet ordre à partir de l'objet. Le deuxième groupe de lentilles (12) comprend deux lentilles négatives et une lentille positive, le troisième groupe de lentilles (13) comprend deux lentilles positives et une lentille négative, le quatrième groupe de lentilles (14) comprend une lentille. Le deuxième groupe et le quatrième groupe (12 et 14) présentent chacun une surface asphérique. Avec cette configuration de seulement dix lentilles, les aberrations dont les chromatiques sont bien corrigées et on réalise ainsi un objectif zoom présentant un champ d'ouverture de 62° ou plus.
PCT/JP2000/007061 1999-10-14 2000-10-11 Objectif zoom et camera video le comprenant WO2001027677A1 (fr)

Applications Claiming Priority (4)

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JP29295699A JP2001117004A (ja) 1999-10-14 1999-10-14 ズームレンズ及びそれを用いたビデオカメラ
JP11/292956 1999-10-14
JP2000034011A JP2001221948A (ja) 2000-02-10 2000-02-10 ズームレンズ
JP2000/34011 2000-02-10

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US6771432B2 (en) 2002-04-09 2004-08-03 Olympus Corporation Zoom lens, and electronic imaging system using the same
US7139130B2 (en) 2003-10-22 2006-11-21 Matsushita Electric Industrial Co., Ltd. Zoom lens, and optical apparatus using the same
CN111722384A (zh) * 2020-07-27 2020-09-29 舜宇光学(中山)有限公司 一种变焦镜头

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JPH11202198A (ja) * 1998-01-14 1999-07-30 Matsushita Electric Ind Co Ltd ズームレンズ及びこれを用いたビデオカメラと電子スチルカメラ
JPH11237551A (ja) * 1997-12-18 1999-08-31 Matsushita Electric Ind Co Ltd ズームレンズ及びそれを用いたビデオカメラ
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EP0872751A1 (fr) * 1997-03-18 1998-10-21 Canon Kabushiki Kaisha Système optique à grossissement variable avec dispositif de stabilisationd'image
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US6771432B2 (en) 2002-04-09 2004-08-03 Olympus Corporation Zoom lens, and electronic imaging system using the same
US6975462B2 (en) 2002-04-09 2005-12-13 Olympus Corporation Zoom lens, and electronic imaging system using the same
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US7139130B2 (en) 2003-10-22 2006-11-21 Matsushita Electric Industrial Co., Ltd. Zoom lens, and optical apparatus using the same
CN111722384A (zh) * 2020-07-27 2020-09-29 舜宇光学(中山)有限公司 一种变焦镜头

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122 Ep: pct application non-entry in european phase
DPE2 Request for preliminary examination filed before expiration of 19th month from priority date (pct application filed from 20040101)