WO2004066012A1 - ズームレンズ及び撮像装置 - Google Patents
ズームレンズ及び撮像装置 Download PDFInfo
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- WO2004066012A1 WO2004066012A1 PCT/JP2004/000198 JP2004000198W WO2004066012A1 WO 2004066012 A1 WO2004066012 A1 WO 2004066012A1 JP 2004000198 W JP2004000198 W JP 2004000198W WO 2004066012 A1 WO2004066012 A1 WO 2004066012A1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
- G02B15/144105—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +-+-
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/145—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 five groups only
- G02B15/1451—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 five groups only the first group being positive
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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 +-++
-
- 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
- G02B15/145—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 five groups only
- G02B15/1451—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 five groups only the first group being positive
- G02B15/145121—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 five groups only the first group being positive arranged +-+-+
-
- 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
- G02B15/15—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 compensation by means of only one movement or by means of only linearly related movements, e.g. optical compensation
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/0062—Stacked lens arrays, i.e. refractive surfaces arranged in at least two planes, without structurally separate optical elements in-between
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0087—Simple or compound lenses with index gradient
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/02—Bodies
- G03B17/12—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B2003/0093—Simple or compound lenses characterised by the shape
Definitions
- the present invention relates to a novel zoom lens and an imaging device. For details, see
- the present invention relates to a zoom lens suitable for a wide-angle, high-magnification video power camera covering an angular range to a super telephoto range, and an imaging device using the zoom lens.
- the zoom ratio (magnification ratio) is the same as the direction to take advantage of the miniaturized image sensor, and the direction to aim at further miniaturization and practical size There is a direction to aim for higher magnification of the zoom ratio.
- This zoom lens consists of five lens units, arranged in order from the object side, positive, negative, positive, negative, and positive refractive power, and zooms by moving at least the second and fourth lens units. By performing focusing and focusing, a zoom ratio of about 20 is obtained.
- the zoom lens disclosed in Japanese Patent Application Laid-Open No. 20000-36 which uses three lenses made of special low-dispersion glass, can not be mass-produced, and a consumer-use zoom lens It is not suitable as
- the present invention can cover from the super wide-angle area to the super-telephoto area at about 40 times, with an angle of view of 67 degrees or more at the wide-angle end and 1.6 degrees or less at the telephoto end It is an object of the present invention to provide a zoom lens which is excellent in mass productivity, in which various aberrations are well corrected while having a zoom ratio, and an image pickup apparatus using the zoom lens. Disclosure of the invention
- the zoom lens according to the present invention mainly includes a first lens group having positive refractive power, which is arranged in order from the object side, and zooming mainly having negative refractive power. And a third lens group having a positive refractive power, and a third lens group having a positive refractive power and a second lens group having a positive or a negative refractive power, for capturing fluctuations in focal position during zooming. And a fourth lens group movable in the direction of the optical axis for focusing as well as the second lens group, the inner lens of the fourth lens group or the fifth lens group comprising the fourth lens group.
- the lens unit 1 has at least a concave lens arranged in order from the object side, a convex lens, and a three-piece cemented lens in which a lens made of special low-dispersion glass is sandwiched in the middle.
- an imaging apparatus comprising: a zoom lens; imaging means for converting an image captured by the zoom lens into an electrical image signal; and image control means.
- the control means moves a point on the image specified by the image signal formed by the image pickup means while referring to the conversion coordinate coefficient prepared in advance according to the magnification ratio by the zoom lens,
- the first lens group having positive refractive power is configured to form a new converted image signal and output the new image signal, and the zoom lens is arranged in order from the object side at least.
- the zoom lens and the image pickup apparatus of the present invention it is possible to cover from the ultra-wide-angle range to the far-field far-range from the field angle of 67 degrees or more at the wide-angle end and 1.6 degrees or less at the telephoto end. While various aberrations are well corrected while having a zoom ratio of about double, and a lens made of a special low dispersion glass is positioned in the middle of a three-piece cemented lens, ultrasonic waves can be applied without lens coating. No latent damage occurs during cleaning.
- latent flaws generated during lens polishing or ultrasonic cleaning can be filled with an adhesive between the cemented lenses, and coating is also unnecessary by bonding.
- the zoom lens has a first lens group having a positive refractive power, which is arranged in order from the object side at least, and a negative refractive power.
- a zoom lens of the single focus type comprising a fourth lens group or a fifth lens group, and a fourth lens group movable in the direction of the optical axis to correct fluctuations in the focal position and to perform focusing.
- the first lens group has at least a concave lens arranged in order from the object side, a convex lens, and a three-piece cemented lens in which a lens made of special low-dispersion glass is in the middle. It is characterized by Do.
- the lens made of special low dispersion glass is positioned in the middle of the three-piece cemented lens, there will be no latent damage during ultrasonic cleaning without lens coating. Since the scratches and latent scratches generated during cleaning can be filled with the adhesive located between the cemented lenses, and the coating becomes unnecessary by bonding, a low-cost, mass-produced zoo can be obtained. You can get a lens.
- the first cemented lens A1 and the special low dispersion in which the three cemented lenses in the first lens group are arranged in order from the object side are used.
- the first concave lens A 1 and the second convex lens A 2 are composed of a convex lens A 2 and a second concave lens A 3 made of glass, and the refractive index at the C line, d line, F line and g line respectively
- nC, nd, nF, ng, and nx be the refractive index nd at the d-line of the lens Ax (Xth lens from the object side of the three cemented lenses, the same applies hereinafter), and
- the first cemented lens in the first lens group is arranged in order from the object side.
- a second concave lens A3 formed of a special low dispersion glass, and the convex lens A2 and the second concave lens A3 are C-line, d-line, F-line, and the like.
- the first lens of the concave meniscus lens having a convex surface facing the object side, wherein the first lens group is arranged in order from the object side
- the second lens of the convex lens, the third lens of the concave meniscus lens with the convex surface facing the object side, the fourth lens of the convex lens, and the fifth lens of the concave meniscus lens with the concave surface facing the object side Since the cemented lens and the sixth lens of the convex lens are used, it is easy to correct curvature of field, distortion and spherical aberration.
- the first lens group is arranged in order from the object side, a first lens of a concave meniscus lens having a convex surface facing the object side, a first lens of the convex lens 2 lens, the third lens of the concave meniscus lens with the convex surface facing the object side, the fourth lens of the convex lens, the fifth lens of the concave meniscus lens with the convex surface facing the object side, the sixth lens of the convex lens, and It is composed of the third cemented lens consisting of the seventh lens of the concave meniscus lens concave on the object side and the eighth lens of the convex lens, so it is easy to correct curvature of field, distortion and spherical aberration.
- the first lens group is arranged in order from the object side, and a first lens of a concave meniscus lens having a convex surface facing the object side, a first lens of the convex lens A cemented lens of a second lens and a third lens of a concave meniscus lens with a convex surface facing the object side and a fourth lens of a convex lens
- the third cemented lens consisting of the fifth lens of the concave meniscus lens convex on the object side, the sixth lens of the convex lens, and the seventh lens of the concave meniscus lens concave on the object side, and the eighth lens of the convex lens Since it is composed of, it is easy to capture curvature of field, distortion and spherical aberration.
- FIG. 1 shows a first embodiment of a zoom lens according to the present invention together with FIGS. 2 to 4, and this figure is a schematic view showing a lens configuration.
- FIG. 2 is a diagram showing spherical aberration, astigmatism and distortion at the wide angle end.
- FIG. 3 is a diagram showing spherical aberration, astigmatism and distortion at an intermediate focal position between the wide angle end and the telephoto end.
- FIG. 4 is a diagram showing spherical aberration, astigmatism and distortion at the telephoto end.
- FIG. 5 shows a second embodiment of the zoom lens according to the present invention together with FIGS. 6 to 8, and this figure is a schematic view showing a lens configuration.
- FIG. 6 is a diagram showing spherical aberration, astigmatism and distortion at the wide angle end.
- FIG. 7 is a view showing spherical aberration, astigmatism and distortion at an intermediate focal position between the wide angle end and the telephoto end.
- FIG. 8 is a diagram showing spherical aberration, astigmatism and distortion at the telephoto end.
- FIG. 9 shows a third embodiment of the zoom lens of the present invention together with FIGS. 10 to 12, and this figure is a schematic view showing a lens configuration.
- FIG. 10 is a diagram showing spherical aberration, astigmatism and distortion at the wide angle end.
- FIG. 11 is a diagram showing spherical aberration, astigmatism and distortion at an intermediate focal position between the wide angle end and the telephoto end.
- FIG. 12 is a diagram showing spherical aberration, astigmatism and distortion at the telephoto end.
- FIG. 13 shows a fourth embodiment of the zoom lens of the present invention together with FIGS. 14 to 16.
- FIG. 13 is a schematic view showing a lens configuration.
- FIG. 14 is a diagram showing spherical aberration, astigmatism and distortion at the wide angle end.
- FIG. 15 is a diagram showing spherical aberration, astigmatism and distortion at an intermediate focal position between the wide angle end and the telephoto end.
- FIG. 16 is a diagram showing spherical aberration, astigmatism and distortion at the telephoto end.
- FIG. 17 shows a fifth embodiment of the zoom lens according to the present invention together with FIGS. 18 to 20.
- FIG. 17 is a schematic view showing a lens configuration.
- Figure 18 shows the spherical aberration, astigmatism and distortion at the wide-angle end
- FIG. 19 is a diagram showing spherical aberration, astigmatism and distortion at an intermediate focal position between the wide angle end and the telephoto end.
- FIG. 20 is a diagram showing spherical aberration, astigmatism and distortion at the telephoto end.
- FIG. 21 is a block diagram of the main part showing an embodiment of the imaging apparatus of the present invention.
- FIG. 22 is a diagram in which some of commercially available glass materials are distributed with the refractive index on the vertical axis and the abbe number on the horizontal axis.
- FIG. 23 is a diagram in which some of commercially available glass materials are distributed with the partial dispersion ratio on the vertical axis and the Abbe number on the horizontal axis, and a standard line is displayed.
- FIG. 1 to 4 show the first embodiment
- FIG. 5 to FIG. 8 show the second embodiment
- FIGS. 9 to 12 show the third embodiment
- FIG. 13 to FIG. 16 shows the fourth embodiment
- FIGS. 17 to 20 show the fifth embodiment.
- V i is the abbe number at the d-line of the ith lens from the object side
- f is the focal length of the entire lens system
- F no is the open F value
- ⁇ is the half image The corners are shown respectively.
- the first lens group G r 1 having positive refractive power which is arranged in order from the object side
- a third lens having a positive refractive power It consists of a group G r 3 and a fourth lens group G r 4 which has a negative refractive power and is movable in the direction of the optical axis to compensate for focal position fluctuations during zooming and to focus. It is a zoom lens of the 4 group lens focus type.
- the zoom lenses 3, 4 and 5 according to the third, fourth and fifth embodiments are arranged in order from the object side as shown in FIG. 9, FIG. 13 and FIG.
- This is a five-group inner-focus type zoom lens consisting of a fourth lens group G r 4 movable in a direction and a fifth lens group G r 5 having positive refractive power.
- the first lens group G r 1 has at least one cemented lens of concave and convex lenses and special low dispersion glass sandwiched in the middle, arranged in order from the object side.
- zoom lenses 1 and 2 according to the first and second embodiments will be described in detail.
- the first lens group G r 1 is a concave having a convex surface facing the object side, which is arranged in order from the object side.
- the first lens L 1 of the meniscus lens, the second lens L 2 of the convex lens, the third lens L 3 of the concave meniscus lens with the convex surface facing the object side, the fourth lens L 4 of the convex lens L 4 and the concave surface on the object side It is composed of four lenses and six lenses, a triple cemented lens T 1 consisting of a fifth lens L 5 of a concave meniscus lens with a face to face, and a sixth lens L 6 of a convex lens.
- the second lens group G r 2 includes two groups of a seventh lens L 7 of concave lens, and a cemented lens T 3 of the eighth lens L 8 of concave lens and the ninth lens L 9 of convex lens arranged in order from the object side It consists of three lenses.
- the configuration of the third lens unit Gr 3 and subsequent lens units differs between the zoom lens 1 according to the first embodiment and the zoom lens 2 according to the second embodiment.
- the third lens group G r 3 is configured of a tenth lens L 10 of a convex lens
- the fourth lens group G r 4 is arranged in order from the object side 1st lens L 1 1 of the convex lens
- the first lens 2 of the concave lens 1 and the second lens 3 of the convex lens L3 are formed by a three-sheet cemented lens T7.
- the third lens unit G r 3 is arranged in order from the object side, and is a tenth lens L 10 of a convex lens, and a first 11 lens LI of a convex lens.
- the first lens unit of the first lens unit and the second lens unit L12 of the concave lens unit T2 consists of two lenses and three lenses.
- the fourth lens unit Gr4 is made up of the first lens unit 13 of the convex lens unit L13. Be done.
- the first lens group G r 1 is characterized by having at least one concave lens and at least one convex lens.
- a wide angle of view can be achieved by a concave lens (first lens L 1) and a convex lens (second lens L 2) arranged in order from the object side, and correction of curvature of field is facilitated.
- the first lens group Gr1 On the telephoto side, the first lens group Gr1 has a positive refracting power and spherical aberration on the under side is likely to occur. However, the spherical aberration is caused by the action of the concave lens L2 disposed closer to the object. Correction is easy.
- the material of the three-piece cemented lens T 1 is a material suitable for capturing secondary spectra in a general telephoto lens. That is,
- the refractive index at C line, d line, F line and g line is n c, n d, n F and n g respectively
- n x refractive index n d of the lens Ax (Xth lens from the object side of the triple cemented lens, the same shall apply hereinafter) n d
- the convex lens A 2 and the second concave lens A 3 and 1 can be regarded as one hypothetical glass material A 2 3.
- the focal length of the above hypothetical glass material A 23 is determined by the following equation (6), and the dispersion value is determined by the following equation (7),
- the Abbe number V is on the horizontal axis, and the refractive index n is on the vertical axis.
- the glass material shown in Fig. 23 selected from glass materials of convex lens A 2 (fourth lens L 4) and second concave lens A 3 (fifth lens L 5) is arbitrary, and the straight line connecting these two glass materials is If the slope of the standard line P base is gentle, the secondary spectrum will be smaller than when achromatization is performed on the standard line P ase.
- conditional expressions (1) and (2) are the first-order achromatization conditions, and are the conditions necessary to correct the first-order chromatic aberration on the telephoto side. If the conditional expressions (1) and (2) are not satisfied, the chromatic aberration at the telephoto end becomes remarkable, and it becomes impossible to realize a high magnification of 40 times.
- the zoom lenses 1 and 2 it is premised that special low dispersion glass such as F CD 1 or F CD 10 is used for the lens A 2 (fourth lens L 4) in the middle of the triple cemented lens T 1.
- the first concave lens A.sub.1 (third lens L.sub.3) may be, for example, an FDS 60 of a flint system or an FDS 90. Glass materials other than Ta FDSO and FD S 1 are excluded.
- conditional expressions (3), (4), and (5) are second-order achromatic conditions, and It is a necessary condition to correct the secondary chromatic aberration on the far side.
- the glass material of the special low dispersion glass convex lens A 2 (L 4) and the second concave lens A 3 (L 5) is defined by the conditional expression (3) and 1 P 2 ⁇ ⁇ 3
- special low dispersion glass F CD 1 or F CD 10 is used for lens A 2 (L 4) in the middle of 3-piece cemented lens 1.
- the following combinations can be considered as the glass material of each lens for forming a three-piece cemented lens T 1 by bonding three lenses. That is, the first concave lens A 1 (L 3) uses a flint FD S 90 or FDS 1 and the convex lens A 2 (L 4) uses a special low-dispersion glass FCD 1 or F
- the second concave lens A 3 (L 5) is a crown system using CD 10 and using BSC 7, C 3, CF 6 or the like located above the standard line P base in FIG. 23. Conceivable.
- special low dispersion glass is used for the convex lens A 2 (L 4) of the three-piece cemented lens T 1.
- Special low-dispersion glass is soft and low in latent scratch resistance, so it is easy to cause latent scratches in ultrasonic cleaning performed at the time of lens production, but lenses A 1 (L 3) and A consisting of general glass from both sides By sandwiching with 3 (L 5), it is possible to fill in with an adhesive even if some missing occurs.
- special low-dispersion glass has a large thermal expansion coefficient, so if the lens is heated in vacuum in the deposition process for lens coating and air is allowed to flow in immediately after deposition, it is quenched by air and cracks occur. There is a problem that it is easy, but by bonding a lens made of common glass on both sides, the coating itself becomes unnecessary. For these reasons, although it is a special low dispersion glass not suitable for mass production, it can be made excellent in mass productivity by using it in the middle of the three-piece cemented lens T1.
- the third lens group G r 3 which is a fixed group is a part where the light flux spreads at the wide angle end, and therefore, it is a part having a dominant influence on spherical aberration and coma at the wide angle end. Therefore, in the zoom lenses 1 and 2, at least one of the surfaces constituting the third lens group G r 3 is formed by an aspheric surface, and among the surfaces constituted by the aspheric surfaces, At least one surface has an aspheric surface shape that is shallower than the depth of the paraxial sphere at the effective diameter.
- the positive refractive power of the third lens group G r 3 is divided into two lens groups and divided, and one of the groups is provided with a cemented surface having a negative refractive power.
- the zoom lens 2 the third lens unit Gr3, the convex lens (the first lens L10), the convex lens (the first lens L11), and the concave lens (the first lens 2)
- the cemented lens T 8 of the lens L 12 2 is configured to suppress the occurrence of spherical aberration and the occurrence of coma.
- at least one of the surfaces constituting the fourth lens unit G r 4 is configured by an aspheric surface.
- at least one of the surfaces formed by the aspheric surface has an aspheric shape that is shallower than the depth of the paraxial sphere at the effective diameter.
- the first lens group G r 1 is a concave having a convex surface facing the object side, which is arranged in order from the object side
- a cemented lens T 1 consisting of a fifth lens L 5 of a concave meniscus lens with a convex surface, a sixth lens L 6 of a convex lens, and a seventh lens L 7 of a concave mesh lens with a concave surface facing the object side; It is composed of six lenses and eight lenses together with the eighth lens L 8 of the convex lens.
- the first lens group G r 1 is a concave first lens L of a concave Meniscus lens having an eyelid surface facing the object side, arranged in order from the object side. 1, a cemented lens 2 of a second lens L 2 of a convex lens, a third lens L 3 of a concave meniscus lens having a convex surface facing the object side, and a fourth lens L 4 of a convex lens, and a convex surface facing the object side
- Lens L 8 consists of five lenses and eight lenses.
- the third lens L 9 includes a ninth lens L 9 of concave lens and a tenth lens L 10 of concave lens and a first lens 1 of convex lens L 1.
- the third lens unit includes, in order from the object side, a convex lens first lens 2 L 12 and a concave lens first lens 3 and a fourth convex lens L 1 4 cemented lens T 4 Composed of three lenses.
- the fourth lens group G r 4 is a cemented lens of a first lens of concave lens 15, a sixth lens of concave lens 16 and a seventh lens of convex lens L 17 arranged in order from the object side. Composed of three lenses with five.
- the fifth lens group G r 5 is, in order from the object side, a convex lens No. 18 lens L 18, a convex lens No. 19 lens, and a concave lens No. 20 lens L 20 joining Composed of 3 lenses with lens T 6.
- the first lens group G r 1 has a front group having a negative refractive power, which includes the first lens L 1 to the third lens L 3, and a positive refractive power, which includes the fourth lens L 4 to the eighth lens 8. Can be divided into two groups.
- the front group of the first lens group G r 1 is characterized by having at least one concave lens and at least one convex lens. Correction of curvature of field by decreasing the inclination of the chief ray with a concave lens in the wide-angle range with a concave lens (first lens L 1) and a convex lens (second lens L 2) arranged in order from the object side As a result, the action of the convex lens L 2 makes it easy to capture distortion.
- the first lens group Gr1 has a positive refracting power, so it tends to generate spherical aberration on the under side, but the action of a concave lens placed closer to the object makes it possible to capture this spherical aberration.
- the first lens L 1 and the third lens L 1 are arranged to minimize the occurrence of distortion on the barrel side.
- L 3 is a concave meniscus lens with a convex surface facing the object side,
- the second lens L2 which is a convex lens.
- the material of the three-piece cemented lens T1 is made of a material suitable for correcting the second-order spectrum of a general telephoto lens. In other words, it is necessary to have a material configuration that satisfies the conditional expressions (1), (2), (3), (4) and (5) described above.
- the convex lens A 2 and the second concave lens A 3 can be regarded as one hypothetical glass material A 2 3.
- the focal length of the above hypothetical glass material A23 is determined by the above equation (6), and the dispersion value is determined by the above equation (7), and using that value, the partial dispersion ratio P23 is 8) It can be obtained by the formula.
- the Abbe number V is on the horizontal axis
- the refractive index n is on the vertical axis
- the Abbe number V is on the horizontal axis
- the vertical axis is
- a glass material of convex lens A2 (sixth lens L6) and second concave lens A3 (seventh lens L7) is arbitrarily selected from the glass materials shown in FIG. 23, and the straight line connecting these two glass materials is a standard. If the slope of the line P base is gentle, the secondary spectrum is smaller than when achromatizing on the standard line P base.
- conditional expressions (1) and (2) are primary achromatic conditions as described above, and are conditions necessary to correct primary chromatic aberration on the telephoto side. If the conditional expressions (1) and (2) are not satisfied, the chromatic aberration at the telephoto end becomes remarkable, and it becomes impossible to realize a high magnification of 40 times.
- zoom lenses 3, 4 and 5 it is possible to use special low dispersion glass, such as F CD 1 or F CD 10, for the lens A 2 (sixth lens L 6) in the middle of the three-piece cemented lens T 1.
- F CD 1 or F CD 10 for the lens A 2 (sixth lens L 6) in the middle of the three-piece cemented lens T 1.
- the first concave lens A 1 is, for example, a flint FD S 60, FD Glass materials other than S90, TaFD30 and FDS1 are excluded.
- conditional expressions (3), (4), and (5) are second-order achromatic conditions, which are conditions necessary to correct second-order chromatic aberration on the telephoto side. If conditional expression (3) is not satisfied, it will be difficult to correct spherical aberration, coma and axial chromatic aberration on the telephoto side.
- conditional expressions (4) and (5) are satisfied, the slope of the straight line connecting the glass materials of the convex lens A 2 (sixth lens L 6) and the second concave lens A 3 (seventh lens L 7) is shown in FIG. Compared with the slope of the standard line P base, it contributes to the reduction of second-order spectrum. Ru.
- the glass material of the special low dispersion glass convex lens A 2 (L 6) and the second concave lens A 3 (L 7) is defined by the conditional expression (3) and IP 2 ⁇ P 3
- the desired configuration can be obtained.
- the following combinations can be considered as the glass material of each lens for forming a three-piece cemented lens T 1 by bonding three lenses. That is, the first concave lens A l (L 5) uses the FDS 90 or FDS 1 of the flit system, and the convex lens A 2 (L 6) uses the special low dispersion glass FCD 1 or F CD It is possible to use a BSC 7, C 3 or CF 6 or the like, which is a crown system for the second concave lens A 3 (L 7) and is located above the standard line P base in FIG. Conceivable.
- special low dispersion glass is used for the convex lens A 2 (L 6) of the three-piece cemented lens T 1. Since special low dispersion glass is soft and low in latent scratch resistance, it is easy to cause latent scratches in ultrasonic cleaning performed at the time of lens production, but lenses A 1 (L 5) and A consisting of general glass from both sides By inserting 3 (L 7), it is assumed that some omission occurred Even adhesive can be filled. In addition, special low-dispersion glass has a large thermal expansion coefficient, so if the lens is heated in vacuum in the deposition process for lens coating and air is allowed to flow in immediately after deposition, it is quenched by air and cracks occur.
- the first lens L12 to the fourth lens L14 constituting the third lens group Gr3 At least one surface of each of the surfaces is formed by an aspheric surface, and at least one of the surfaces formed by the aspheric surface has an aspheric shape that is shallower than the depth of the paraxial sphere at the effective diameter. did.
- the third lens group G r 3 that has the function of converting the divergent light flux from the second lens group G r 2 into a convergent light flux and sending it to the fourth lens group G r 4 has a strong positive refractive power, and At the wide-angle end, it is a part where the light flux spreads, so it is a part that has a dominant influence on spherical aberration and coma at the wide-angle end. Therefore, in order to gradually convert the divergent beam to a convergent beam, the positive refractive power of the third lens group Gr 3 is divided into two lens groups, and further, the negative refracting of one of the groups is performed. It is effective to provide a joint surface having a force.
- the third lens group Gr 3 is a convex lens (the first two lenses L 12) and a concave lens (the first three lenses L 13) and the second convex lens
- the cemented lens T4 (the first lens L14) is used to suppress the generation of spherical aberration and the generation of coma.
- At least one of the surfaces s 2 1 to s 2 5 of the lens LI 2 to the lens 1 14 L 14 is aspheric, and at least one of the aspheric surfaces is at least one.
- the surface of the aspheric surface is shallower than the depth of the paraxial sphere.
- the zoom lenses 3, 4 and 5 include the first lens L 18 to lens L 20 constituting the fifth lens group G r 5 At least one of the 0 surfaces is constituted by an aspheric surface, and at least one of the surfaces constituted by the aspheric surface has an aspheric shape which is shallower than the depth of the paraxial sphere at an effective diameter.
- the chief ray bounced outward by the fourth lens group G r 4 has a ray height higher than the maximum image height, and the exit pupil is on the rear side of the image plane.
- 5 Lens group G r 5 needs to be bent. Therefore, in the fifth lens unit Gr5, the positive refractive power is divided into two lens units so that the chief ray is bent gently, and one of the lens units is divided into negative refractions. Provide a bonding surface that has a force. Therefore, the fifth lens group G r 5 is composed of a convex lens (first lens L 18) and a cemented lens T 6 of a convex lens (lens nineteenth lens L 19) and a concave lens (twentieth lens L 20). To suppress the occurrence of astigmatism and distortion.
- FIG. 21 is a block diagram showing a configuration example of an imaging device 100 according to the present invention.
- 1 0 1 is a focus lens 1 0 1 a or parrier.
- An image control circuit that controls various operations such as capturing an image, such as an image pickup device (image pickup means) such as a CCD, and a zoomable photographing lens 102 having a lens lens 101 b.
- Image control means) 104 is a first image memory for storing image data obtained from the image sensor 102, and 105 is a second image memory for storing image data whose distortion has been corrected.
- Reference numeral 106 denotes a data table for storing distortion aberration information of the imaging lens 101
- reference numeral 100 denotes a zoom switch for converting a photographer's zooming instruction into an electrical signal.
- the zoom lens 1, 2, 3, 4 or 5 according to each of the above embodiments can be applied to the above shooting lens 101, and in this case, the focusing lens 101a is the fourth lens.
- the variator lens 101 b corresponds to the second lens group G r 2.
- FIG. 2 to FIG. 4 As shown in FIG. 2 to FIG. 4, FIG. 6 to FIG. 8, FIG. 10 to FIG. 12, FIG. 14 to FIG. 16 and FIG. 18 to FIG.
- the distortion curve changes due to zooming. Therefore, the change in distortion depends on the position of the variator lens 101 b. Therefore, converted coordinates that associate two-dimensional position information of the first image memory 104 and the second image memory 105 at a certain position of the Noriator lens 101 with the data table 106
- the coefficients are stored, and the positions of the variator lens 1 0 1 are divided into many positions from the wide-angle end to the telephoto end, and conversion coordinate coefficients corresponding to the respective positions are stored in the data table 1 0 6 There is.
- the image control circuit 1 0 3 moves the focus lens 1 O la so that the focus is not blurred.
- transformation coordinate coefficients corresponding to the position of the variator lens 1 0 1 b are received from the data table 1 0 6. If the Noreator lens 101 b position does not coincide with any of the previously divided positions, conversion of the position near that position is not necessary. By processing such as interpolation from the coordinate coefficients, appropriate transformed coordinate coefficients are obtained.
- the transformation coordinate coefficient is a coefficient for moving the position of the point on the image discretely arranged two-dimensionally, but for the image between the discretely arranged point, interpolation is performed Find the position to move by processing such as.
- the image control circuit 103 performs vertical and horizontal image movement processing of the information of the first image memory 104 obtained from the imaging device 102 based on the conversion coordinate coefficient.
- the distortion is corrected, and the distortion-corrected image information is created in the second image memory 105, and a signal based on the image information created in the second image memory 105 is output as a video signal. .
- IR is the stop fixed immediately before the third lens group G r 3 and FL is the filter inserted in front of the image plane IMG. It is.
- the lens used in each embodiment includes one in which the lens surface is formed by an aspheric surface. Therefore, assuming that the aspheric surface depth is “x” and the height from the optical axis is “H”,
- Shall be defined by Note that ⁇ 4, ⁇ 6, ⁇ and A1 0 are the 4th, 6th, 8th and 10th order aspheric coefficients respectively.
- Table 1 shows each value in a numerical example of the zoom lens 1 according to the first embodiment.
- the sixth lens L 6 surface s 9 and the tenth lens L 10 surface s 1 7 s 1 are aspheric.
- Table 3 shows the aspheric coefficients A 4 A 6 A 8 A 10 of the 4th, 6th, 8th, and 10th order of the surfaces s 9 si 7 si 8 and si 9 above.
- E in the above-mentioned Table 3 means an exponential expression which makes 10 the base (It is the same also in the below-mentioned Table 7, Table 11, Table 15, and Table 19) .
- Table 4 shows the values of the conditional expressions (1) to (5) of the zoom lens 1 and the values of f, F no and 2 o.
- Figs. 2 to 4 show spherical aberration diagrams, astigmatism diagrams and distortion diagrams at the wide-angle end, the intermediate focal position of the wide-angle end and the telephoto end of the zoom lens 1, and the telephoto end, respectively.
- the solid line indicates the e-line
- the broken line indicates the C-line (wavelength 6 56.3 nm)
- the dashed-dotted line indicates the g-line (wavelength 4 35 ⁇ 8 nm).
- the solid line shows the value on the sagittal image plane
- the broken line shows the value on the meridional image plane.
- Table 5 shows each value in a numerical example of the zoom lens 2 according to the second embodiment.
- the surface s 10 of the sixth lens L 6 and the surface s 1 of the 10 th lens L 10 are aspheric.
- Table 7 shows the 4th, 6th, 8th and 10th order aspheric coefficients A4 A 6 A 8 A 10 of the above surfaces s 10 s i 7 s i 8 s 2 1 and s 2 3.
- Table 8 shows the values of the conditional expressions (1) to (5) of the zoom lens 2 and the values of f, F no and 2 ⁇ .
- the solid line indicates the e-line
- the broken line indicates the C-line (wavelength 6 56.3 nm)
- the dashed-dotted line indicates the g-line (wavelength 4 35. 8 nm).
- the solid line shows the value on the sagittal image plane
- the broken line shows the value on the meridional image plane.
- Table 9 shows each value in a numerical example of the zoom lens 3 according to the third embodiment.
- the values of dl 4, dl 9, d 2 5 and d 3 0 are shown.
- the surface of the first 13 lens L 13 and the surface s 21 of the first lens 19 and the surface s 33 of the third lens L 19 are aspheric. It is made.
- Table 11 shows the aspheric coefficients A4, A6, A8, and A10 of the fourth, sixth, eighth, and tenth orders of the surfaces s 2 1 and s 3 3 above.
- Table 12 shows the values of the above conditional expressions (1) to (5) of the zoom lens 1
- FIGS. 10 to 12 show spherical aberration diagrams, astigmatism diagrams, and distortion diagrams at the wide-angle end, at an intermediate focal position between the wide-angle end and the telephoto end of the zoom lens 1, and at the telephoto end, respectively.
- the solid line indicates the e-line
- the broken line indicates the C-line (wavelength 6 56.3 nm)
- the alternate long and short dash line indicates the g-line (wavelength 4 38.5 nm).
- the solid line shows the value on the sagittal image plane
- the broken line shows the value on the meridional image plane.
- Table 13 shows values in the numerical example of the zoom lens 4 according to the fourth embodiment.
- the surface s 21 of the first lens L 13 and the surface 33 3 of the first lens 19 are formed as aspheric surfaces. ing.
- Table 15 shows the aspheric coefficients A4, A6, A8, and A10 of the fourth, sixth, eighth, and tenth orders of the surfaces s 2 1 and s 3 3 above.
- Table 16 shows the values no and 2 ⁇ of the conditional expressions (1) to (5) of the zoom lens 4 described above.
- Figures 14 to 16 show spherical aberration diagrams, astigmatism diagrams, and distortion diagrams at the wide-angle end, at an intermediate focal position between the wide-angle end and the telephoto end of the zoom lens 4, and at the telephoto end, respectively.
- the solid line indicates the e-line
- the broken line indicates the C-line (wavelength 6 56.3 nm)
- the alternate long and short dash line indicates the g-line (wavelength 4 38.5 nm).
- a solid line indicates a sagittal image plane
- a broken line indicates a value on the meridional image plane.
- Table 17 shows each value in a numerical example of the zoom lens 5 according to the fifth embodiment.
- the surface s 20 of the first lens L 13 and the surface s 32 of the first lens L 19 are formed as aspheric surfaces. ing.
- Table 19 shows the aspheric coefficients A4, A6, A8, and A10 of the fourth, sixth, eighth, and tenth orders of the surfaces s20 and s32.
- FIGS. 18 to 20 show spherical aberration diagrams, astigmatism diagrams, and distortion diagrams at the wide-angle end of the zoom lens 5, the intermediate focal position between the wide-angle end and the telephoto end, and the telephoto end, respectively.
- the solid line indicates the e-line
- the broken line indicates the C-line (wavelength 6 56.3 nm)
- the alternate long and short dash line indicates the g-line (wavelength 4 38.5 nm).
- the solid line shows the value on the sagittal image plane
- the broken line shows the value on the meridional image plane.
- the present invention has a zoom ratio of about 40 times, an angle of view of not less than 67 degrees at the wide-angle end, and not more than 1.6 degrees at the telephoto end. It is an object of the present invention to provide a zoom lens which is well-corrected for various aberrations while being powerfully pared, and which is excellent in mass productivity, in particular, a zoom lens and an imaging device suitable for consumer video cameras. Can.
- the shapes and numerical values of the respective parts shown in each of the above-described embodiments are merely examples of the embodiment to be carried out in practicing the present invention, and the technical scope of the present invention can be obtained by these. Is interpreted in a limited way It must not be there. Industrial applicability
- the various aberrations are corrected well while the power from super wide angle to super telephoto is corrected, and mass production is excellent, and it is particularly suitable for use in zoom lenses and video cameras for consumer video cameras.
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- General Physics & Mathematics (AREA)
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- Studio Devices (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/541,094 US7623299B2 (en) | 2003-01-17 | 2004-01-14 | Zoom lens and imaging apparatus |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2003-009718 | 2003-01-17 | ||
JP2003009718 | 2003-01-17 | ||
JP2003330038A JP4016204B2 (ja) | 2003-01-17 | 2003-09-22 | ズームレンズ及び撮像装置 |
JP2003-330038 | 2003-09-22 |
Publications (1)
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WO2004066012A1 true WO2004066012A1 (ja) | 2004-08-05 |
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PCT/JP2004/000198 WO2004066012A1 (ja) | 2003-01-17 | 2004-01-14 | ズームレンズ及び撮像装置 |
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Country | Link |
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US (1) | US7623299B2 (ja) |
JP (1) | JP4016204B2 (ja) |
KR (1) | KR20050092389A (ja) |
CN (1) | CN100523902C (ja) |
WO (1) | WO2004066012A1 (ja) |
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EP2060944A3 (en) * | 2007-11-07 | 2009-09-30 | Samsung Electronics Co., Ltd. | Compact zoom lens |
US11391932B2 (en) | 2018-01-19 | 2022-07-19 | Canon Kabushiki Kaisha | Zoom lens and image pickup apparatus having the same |
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JP4257600B2 (ja) * | 2004-06-14 | 2009-04-22 | ソニー株式会社 | 撮像装置及びズームレンズ |
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JP5159398B2 (ja) | 2008-04-07 | 2013-03-06 | 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 |
JP5483829B2 (ja) * | 2008-05-19 | 2014-05-07 | キヤノン株式会社 | 情報供給装置、レンズ装置、カメラ装置及び撮影システム |
JP5448028B2 (ja) * | 2008-07-28 | 2014-03-19 | 株式会社ニコン | ズームレンズ、これを有する光学機器 |
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JP5325021B2 (ja) * | 2009-05-20 | 2013-10-23 | Hoya株式会社 | ズームレンズ系 |
JP2010286740A (ja) * | 2009-06-12 | 2010-12-24 | Optoelectronics Co Ltd | 光学的情報読取装置 |
CN102455485B (zh) * | 2010-10-20 | 2014-10-01 | 鸿富锦精密工业(深圳)有限公司 | 广角转接镜头及其应用的光学系统 |
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JP5714925B2 (ja) * | 2011-01-31 | 2015-05-07 | ソニー株式会社 | インナーフォーカス式レンズ |
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KR101971475B1 (ko) | 2013-01-03 | 2019-04-23 | 한화테크윈 주식회사 | 줌 렌즈계 |
JP6543883B2 (ja) * | 2014-01-14 | 2019-07-17 | 株式会社ニコン | 光学系、光学装置 |
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JP6602101B2 (ja) * | 2015-08-21 | 2019-11-06 | 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 |
JP2017187631A (ja) * | 2016-04-06 | 2017-10-12 | オリンパス株式会社 | ズーム光学系及びそれを備えた撮像装置 |
JP2017187639A (ja) * | 2016-04-06 | 2017-10-12 | オリンパス株式会社 | ズーム光学系及びそれを備えた撮像装置 |
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CN109298507B (zh) * | 2017-07-25 | 2021-01-08 | 宁波舜宇车载光学技术有限公司 | 光学镜头 |
CN110412718B (zh) * | 2018-04-28 | 2020-11-24 | 宁波舜宇车载光学技术有限公司 | 光学镜头 |
JP2019152887A (ja) * | 2019-06-18 | 2019-09-12 | 株式会社ニコン | 光学系、光学装置、光学系の製造方法 |
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Also Published As
Publication number | Publication date |
---|---|
CN100523902C (zh) | 2009-08-05 |
JP2004240398A (ja) | 2004-08-26 |
US20060152816A1 (en) | 2006-07-13 |
US7623299B2 (en) | 2009-11-24 |
JP4016204B2 (ja) | 2007-12-05 |
CN1735830A (zh) | 2006-02-15 |
KR20050092389A (ko) | 2005-09-21 |
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