Deprecated: The each() function is deprecated. This message will be suppressed on further calls in /home/zhenxiangba/zhenxiangba.com/public_html/phproxy-improved-master/index.php on line 456
WO2007013557A1 - Lentille de capteur d’image, module optique et terminal portable - Google Patents
[go: Go Back, main page]

WO2007013557A1 - Lentille de capteur d’image, module optique et terminal portable - Google Patents

Lentille de capteur d’image, module optique et terminal portable Download PDF

Info

Publication number
WO2007013557A1
WO2007013557A1 PCT/JP2006/314891 JP2006314891W WO2007013557A1 WO 2007013557 A1 WO2007013557 A1 WO 2007013557A1 JP 2006314891 W JP2006314891 W JP 2006314891W WO 2007013557 A1 WO2007013557 A1 WO 2007013557A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
imaging
optical system
object side
focal length
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2006/314891
Other languages
English (en)
Japanese (ja)
Inventor
Naoto Ohara
Masaki Fujiwara
Tomoya Sugita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyocera Corp
Original Assignee
Kyocera Corp
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 JP2005344307A external-priority patent/JP2007058153A/ja
Priority claimed from JP2006016452A external-priority patent/JP2007148315A/ja
Application filed by Kyocera Corp filed Critical Kyocera Corp
Publication of WO2007013557A1 publication Critical patent/WO2007013557A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
    • G02B15/1431—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being positive
    • G02B15/143101—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being positive arranged +--

Definitions

  • Imaging lens Imaging lens, optical module, and portable terminal
  • the present invention relates to an imaging apparatus with strict restrictions on the overall length, such as a digital still camera using an imaging element, a camera mounted on a mobile phone, or a camera mounted with a mobile information terminal, and is particularly suitable for mounting on a mobile phone or the like.
  • the present invention relates to an imaging lens, an optical module, and a portable terminal suitable for a digital input device (camera module) having a total lens length and high optical performance.
  • the first imaging lens disclosed in Patent Document 1 includes, in order from the object side to the image plane side, a stop, a first lens having a positive refractive power, and a positive surface with a concave surface facing the object side.
  • the second imaging lens disclosed in Patent Document 2 includes an aperture, a first lens having negative refractive power, and a second lens having positive refractive power in order from the object side to the image plane side. And a third lens having a positive refractive power with the concave surface facing the object side, and a fourth lens having a weak negative refractive power.
  • the third imaging lens includes a first lens that also has a glass material force having a positive power and a second lens that also has a resin power having a negative power.
  • a third lens made of a resin material having a positive power, and the aperture is on the object side of the first lens or the third lens.
  • the fourth imaging lens sequentially has an object side force directed toward the image surface side, and in turn, a first lens having a positive power with the convex surface facing the object side, and a negative power with the convex surface facing the image surface side. And a third lens with positive power with the convex surface facing the object side, and the aperture is located on the object side of the first lens or between the first and second lenses .
  • the fifth imaging lens sequentially includes a first lens having a positive power, a second lens having a negative power, and a third lens having a positive power in the order that the object side force is also directed toward the image plane side. All six surfaces that make up each lens are aspherical.
  • the sixth imaging lens has a first lens having a positive positive convexity on the object side and a second power having a negative negative power on the object side in order as the object side force is also directed toward the image plane side.
  • the seventh image pickup lens has a first lens having a positive power, a second lens having a positive power, and a negative or positive power in order as the object side force is also directed toward the image plane side.
  • a third lens is provided, and a diaphragm is disposed between the first lens and the second lens.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2004-252312
  • Patent Document 2 JP 2004-184987 A
  • the imaging lens must be kept at a low cost.
  • the cost of a four-sheet configuration is high. Two sheets do not have sufficient performance for high pixels. Therefore, efficient use of plastic leads to low cost.
  • An object of the present invention is to provide an imaging lens, an optical module, and a mobile terminal in which various aberrations having a short overall length are favorably corrected and an incident angle on an image plane is suppressed.
  • an imaging lens has an imaging optical system for an imaging element, and the imaging optical system is an aperture arranged in order from the object side.
  • conditional expression (1) is satisfied, where L is the total length of the distance from the stop to the image plane, and f is the focal length of the entire system.
  • conditional expression (2) is satisfied, where L is the total length of the distance from the stop to the image plane and f is the focal length of the entire system.
  • conditional expression (3) is satisfied, where L is the total length of the distance from the stop to the image plane and f is the focal length of the entire system.
  • the imaging optical system satisfies the following conditional expressions (4), (5), and (6):
  • f represents the focal length of the entire system
  • fl represents the focal length of the first lens
  • f2 represents the focal length of the second lens
  • f3 represents the focal length of the third lens.
  • the imaging optical system satisfies the following conditional expression (7).
  • f represents the focal length of the entire system
  • f3 represents the focal length of the third lens
  • the second lens and the third lens of the imaging optical system have surfaces with different signs of the central radius of curvature of the central portion and the radius of curvature of the peripheral portion on the image plane side surface.
  • the difference between the largest Abbe number! / Max V (max) and the smallest Abbe number V (min) satisfies the following conditional expression (8):
  • the Abbe number v of the first lens, the Abbe number V of the second lens, and the Abbe number V of the third lens satisfy the following conditions:
  • An imaging lens according to a second aspect of the present invention is an imaging lens having an imaging optical system for an imaging element, and the imaging optical system is arranged in order from the object side and has a positive power. And a second lens having a double-sided aspheric surface with negative power and a third lens having a double-sided aspheric surface with negative power and a convex power on the object side.
  • conditional expression (9) is satisfied, where L is the total length of the distance from the stop to the image plane and f is the focal length of the entire system.
  • the imaging optical system satisfies any of the following conditional expressions (12) and (13).
  • f represents the focal length of the entire system
  • fl l represents the focal length of the first lens
  • fl2 represents the focal length of the second lens
  • the second lens and the third lens of the imaging optical system have surfaces with different signs of the central radius of curvature of the central portion and the radius of curvature of the peripheral portion on the image plane side surface.
  • the difference between the largest Abbe number! / Max V (max) and the smallest Abbe number V (min) satisfies the following conditional expression (14): , Abbe number of the first lens v
  • the Abbe number V of the second lens and the Abbe number V of the third lens are as follows:
  • An optical module includes an imaging lens having an imaging optical system for an imaging device, and a lens holder that holds the imaging lens, and the imaging lens.
  • an aperture stop, a first lens having a positive power, a second lens having a double-sided aspheric surface having a negative power, and a power having a convex on the object side are arranged in order from the object side.
  • a negative third aspherical lens is arranged in order from the object side.
  • a mobile terminal includes an optical module and the optical module.
  • the optical module includes an imaging lens having an imaging optical system for the imaging device, and a lens holder that holds the imaging lens, and the optical lens includes the imaging lens.
  • the imaging optical system has an aperture stop, a first lens with a positive power, a second lens with a double-sided aspheric surface with a negative power, and a convex surface on the object side, arranged in order from the object side. And a negative third aspherical lens.
  • An optical module includes an imaging lens having an imaging optical system for an imaging element, and a lens holder that holds the imaging lens, and the imaging lens In the imaging optical system, the first lens having a positive power, the aperture stop, the second lens having a double-sided aspheric surface having a negative power, and the power having a convex on the object side are arranged in the order of the object side force. And a negative third aspherical lens.
  • a mobile terminal includes an optical module and a housing that houses the optical module, and the optical module includes an imaging optical system that targets an imaging device.
  • An imaging lens; and a lens holder that holds the imaging lens, and the imaging optical system of the imaging lens is arranged in order from the object side, and has a first lens with positive power and an aperture stop.
  • FIG. 1 is a diagram showing a basic configuration of an imaging lens according to a first embodiment of the present invention.
  • FIG. 2 is a diagram showing surface numbers given to a diaphragm portion of each imaging lens, each lens, and a cover glass constituting the imaging portion in the first embodiment.
  • 3A to 3C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 1.
  • FIG. 1 is a diagram showing spherical aberration, distortion, and astigmatism in Example 1.
  • FIG. 4 is a diagram showing a configuration of an imaging lens employed in Example 2.
  • 5A to 5C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 2.
  • FIG. 4 is a diagram showing a configuration of an imaging lens employed in Example 2.
  • 5A to 5C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 2.
  • FIG. 4 is a diagram showing a configuration of an imaging lens employed in Example 2.
  • 5A to 5C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 2.
  • FIG. 6 is a diagram showing a configuration of an imaging lens employed in Example 3.
  • FIG. 7A to FIG. 7C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 3.
  • FIG. 8 is a diagram showing a configuration of an imaging lens employed in Example 4.
  • 9A to 9C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 4.
  • FIG. 9A to 9C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 4.
  • FIG. 10 is a diagram showing a configuration of an imaging lens employed in Example 5.
  • FIG. 11A to FIG. 11C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 5.
  • FIG. 12 is a diagram showing a configuration of an imaging lens employed in Example 6.
  • FIG. 13A to FIG. 13C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 6.
  • FIG. 14 is a diagram showing a configuration of an imaging lens employed in Example 7.
  • FIGS. 15A to 15C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 7.
  • FIGS. 15A to 15C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 7.
  • FIG. 16 is a diagram showing a configuration of an imaging lens employed in Example 8.
  • FIG. 17A to FIG. 17C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 8.
  • FIG. 18 is a diagram showing a configuration of an imaging lens employed in Example 9.
  • FIG. 19A to FIG. 19C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 9.
  • FIG. 20 is a diagram showing a basic configuration of an imaging lens according to the second embodiment of the present invention.
  • FIG. 21 is a diagram showing surface numbers given to the aperture portion of each imaging lens, each lens, and a cover glass constituting the imaging unit in the present embodiment.
  • FIGS. 22A to 22C show spherical aberration, distortion, and astigmatism in Example 10. It is an aberration diagram showing the difference.
  • FIG. 23 is a diagram showing a configuration of an imaging lens employed in Example 11.
  • FIG. 24A to FIG. 24C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 11.
  • FIG. 25 is a diagram showing a configuration of an imaging lens employed in Example 12.
  • FIG. 26A to FIG. 26C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 12.
  • FIG. 27 is a diagram showing a configuration of an imaging lens employed in Example 13.
  • FIG. 28A to FIG. 28C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 13.
  • FIG. 29 is an external perspective view showing an embodiment of a mobile phone equipped with a camera (optical) module employing the imaging lens according to the present embodiment, and is a view showing an open state.
  • FIG. 30 is an external perspective view showing an embodiment of a mobile phone equipped with a camera (optical) module employing the imaging lens according to the present embodiment, and is a view showing a closed state.
  • FIG. 31A and FIG. 31B are an overview perspective view and a sectional view of an optical module according to the present embodiment.
  • FIG. 32 is a perspective view of the internal configuration of the lens unit on which the imaging lens of this embodiment is mounted as viewed from the object side (subject side).
  • FIG. 1 is a diagram showing a basic configuration of an imaging lens according to the first embodiment of the present invention.
  • the imaging lens 100 includes an aperture stop 110, a first lens 120 having a positive power, and a double-sided aspherical surface having a negative power, which are arranged in order from the object side OBJS.
  • the lens includes a two-lens 130, a third lens 140 having a negative double-sided aspheric surface with a convex power on the object side, and an imaging unit 150.
  • the imaging optical system of the imaging lens 100 is configured by the aspherical third lens 140.
  • the imaging optical system is arranged in order from the object-side OBJS, and each includes a total of three lenses, the first lens 120, the second lens 130, and the third lens 140, each having a single lens configuration. It is composed.
  • the first lens 120 is constituted by, for example, a lens having a convex power on both the object side and the image plane side and having a positive power.
  • the second lens 130 is configured as a double-sided aspheric meniscus lens having a negative power.
  • the third lens 140 is a double-sided aspheric meniscus lens having a negative power that is convex toward the object side.
  • the first lens 120 is made of glass
  • the second lens 130 and the third lens 140 are made of grease.
  • a parallel plane plate (cover glass) 151 made of glass and an imaging element 152 having a force such as a CCD or a CMOS sensor are sequentially arranged from the third lens 140 side.
  • the imaging optical system having the first lens 120, the second lens 130, and the third lens 140 described above has a positive, negative, and negative lens configuration as a whole. It is possible to realize an imaging lens in which various aberrations with a short overall length are corrected well and the angle of incidence on the image plane is suppressed.
  • the imaging lens 100 according to the present embodiment having the above-described configuration realizes a compact lens so that it can be mounted on a mobile phone or the like, and various aberrations with a short overall length are favorably corrected, so that an image surface is obtained.
  • Various conditions as described below are set in order to suppress the incident angle.
  • the aperture stop 110 the first lens 120 that is biconvex on both the object side and the image plane side, and the power from the object side.
  • the second lens (meniscus lens) 130 is negative
  • the third lens (meniscus lens) 140 is negative on both sides aspherical and convex on the object side.
  • the chief ray incident angle on the image plane is suppressed at each image height.
  • the reason for suppressing the incident angle is that the image pickup device can efficiently obtain the amount of light.
  • shortening the total length tends to increase the chief ray incident angle and distortion on the image plane.
  • the total length of the distance from the stop to the image plane is L,
  • the focal length is f, the following conditional expression (1) is satisfied.
  • the power of the first lens 120 is positive
  • the power of the second lens 130 is negative
  • the power of the third lens 140 is negative
  • the power is arranged so as to satisfy the following conditional expression. It is configured so that various aberrations can be corrected satisfactorily.
  • the power distribution makes the third lens 140 smaller.
  • the imaging optical system satisfies the following conditional expressions (4), (5), and (6)
  • f represents the focal length of the entire system
  • fl represents the focal length of the first lens 120
  • f2 represents the focal length of the second lens 130
  • f3 represents the focal length of the third lens 140.
  • the present embodiment aims to facilitate the assembling process by weakening the power of the third lens 140.
  • each lens is controlled, and the combination becomes a great amount when considering mass production. Therefore, the first lens 120 and the second lens 130 are given high power and the sensitivity is tightened to give the third lens 140 freedom. By doing so, it is possible to concentrate on controlling the first lens 120 and the second lens 130.
  • the central curvature radius of the central portion and the curvature of the peripheral portion of the second lens and the third lens of the imaging optical system on the image plane side surface are suitable. It has surfaces with different signs of radius.
  • a force that is positive in the vicinity of the paraxial axis must be applied with the ray AX off-axis in the vicinity, so it must have a negative power.
  • the third lens 140 needs to have an inflection point in the periphery and make the power positive so that the angle is large and the incident angle of the light beam is small.
  • the difference between V (max) having the largest Abbe number and V (min) having the smallest Abbe number is as follows.
  • the Abbe number V of the first lens 120, the Abbe number V of the second lens 130, and the third lens are satisfied.
  • the Abbe number V of 140 is configured to satisfy the following conditions.
  • the third lens 140 it is preferable to use a resin lens in terms of structural and cost.
  • the third lens 140 corrects the aberration that occurs in the first lens 120 and the second lens 130 with the imaging optical system having three lenses.
  • the third lens 140 has to take a shape having an inflection point and difficult to mold. If the aspheric coefficient is also suppressed to a low order, it is difficult to achieve performance. Therefore, it is difficult to mold the third third lens with glass, so we are using a lens.
  • the first first lens 120 is preferably glass.
  • plastic By not using plastic, the number of glass materials that can be selected increases and flexibility increases. Since the first sheet is also affected by ultraviolet rays, it is preferable to use glass with less performance deterioration than plastic. Compared to plastic, the use of a high-refractive material suppresses the curvature, and the use of a spherical surface, which is also considered when manufacturing, makes the tolerances looser. However, if cost is a priority, it is desirable to use plastic.
  • the second lens 130 of the second sheet cannot be corrected with both aspheric surfaces of the third lens 140 of the third sheet! / Both surfaces are aspherical surfaces in order to correct various aberrations.
  • Performance can be maintained by managing 30 shapes and eccentricity.
  • Conditional expression 8 is set to [V (max)-v (min) ⁇ 25] because the first sheet is used for color correction with a low degree of freedom of Abbe's number with grease. This is because if there is no difference that satisfies the conditional expression between the first lens 120 or the second second lens 130, the correction may not be possible.
  • the aspherical shape of the lens is positive when the direction from the object side to the image surface side is positive, k is a cone coefficient, A, B, C, and D are aspheric coefficients, and r is the central curvature.
  • h is the height of the light beam, and c is the reciprocal of the central radius of curvature.
  • Z is the depth of the tangential force on the surface vertex
  • A is the fourth-order aspheric coefficient
  • B is the sixth-order aspheric coefficient
  • C is the eighth-order aspheric coefficient
  • D is the tenth-order aspheric coefficient
  • the center curvature radius of the object side surface 1 of the first lens 120 is R1
  • the center curvature radius of the image surface side surface 2 of the first lens 120 is Is R2
  • the center curvature radius of the object side surface 3 of the second lens 130 is R3
  • the center curvature radius of the image side surface 4 of the second lens 130 is R4
  • the center curvature radius of the object side surface 5 of the third lens 140 is
  • the center radius of curvature of the image surface side surface 6 of the third lens 140 is R6 and the cover lens of the imaging unit 150 is R5.
  • the center curvature radius of the surface 7 of the lath 151 on the third lens 140 side is set to R7
  • the center curvature radius of the surface 8 of the cover glass 151 on the imaging element 152 side is set to R8.
  • the center curvature radii R7 and R8 of both surfaces 7 and 8 of the cover glass 151 are zero.
  • the refractive index of the first lens 120 is set to Nl
  • the refractive index of the second lens 130 is set to N2
  • the refractive index of the third lens 140 is set to N3.
  • the light incident from the object side OBJS passes through the aperture stop 110, and the object side surface 1, the image surface side surface 2 of the biconvex first lens 120, and the second lens whose power is negative. 13 0 Object side 3, Image side 4, 3rd lens 140 using object side convex resin 140 Object side 5, Image side 6, Cover glass 151 Object side 7, Image side 8 The light passes through and is focused on the image sensor 152.
  • the distance between the diaphragm 110 and the surface 1 of the first lens 120 is Dl
  • the distance between the surface 1 and the surface 2 that is the thickness of the first lens 110 is D2
  • the first 1 The distance between the surface 2 of the lens 120 and the surface 3 of the second lens 130 is D3
  • the distance between the surface 3 and the surface 4 that is the thickness of the second lens 130 is D4
  • the surface 4 and the surface of the second lens 130 3 The distance between surface 5 of lens 140 is D5
  • the distance between surface 5 and surface 6 that is the thickness of third lens 140 is D6, and the distance between surface 6 of third lens 140 and surface 7 of cover glass 151 is D.
  • the thickness of cover glass 151 is D8.
  • the incident angle to the image sensor 152 is made as small as possible (shallow) by shortening the overall length and taking the exit pupil longer. Can do.
  • FIG. 2 shows the diaphragm 110, the lenses 120 to 140, and the cover glass 151 that constitutes the imaging unit 150 that constitute each lens group of the imaging lens 100.
  • the surface number was given.
  • Tables 1 and 2 show the numerical values of Example 1. Each numerical value of the example is the imaging lens 1 in FIG. It corresponds to 00.
  • Table 1 shows the aperture, lens, cover glass radius of curvature (R: mm), distance (D: mm), refractive index (N), and Abbe number (corresponding to each surface number of the imaging lens in Example 1. v) is shown.
  • Table 2 shows aspheric coefficients of predetermined surfaces of the first lens 120, the second lens 130, and the third lens 140 including the aspherical surface in Example 1.
  • k is the conic constant
  • A is the fourth-order aspheric coefficient
  • B is the sixth-order aspheric coefficient
  • C is the eighth-order aspheric coefficient
  • D is the tenth-order aspheric coefficient.
  • FIG. 3A to FIG. 3C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 1.
  • Fig. 3A shows spherical aberration
  • Fig. 3B shows distortion
  • Fig. 3C shows astigmatism.
  • the broken line M indicates the value of the d line on the meridional image plane
  • the solid line S indicates the value of the d line on the sagittal image plane.
  • Example 1 As can be seen from FIGS. 3A to 3C, according to Example 1, various spherical, distortion, and astigmatism aberrations are satisfactorily corrected, and an imaging lens with excellent imaging performance can be obtained.
  • Tables 3 and 4 show the numerical values of Example 2. Each numerical value in the example corresponds to the imaging lens 1 OOA in FIG. In the imaging lens 100A in FIG. 4, three of the first to third lenses are made of grease (in Example 1, the first lens is made of glass, and the second and third lenses are made of grease. is doing).
  • Table 3 shows the diaphragm, radius, curvature (D: mm), refractive index (N), and Abbe number (R: mm) corresponding to each surface number of the imaging lens in Example 2. v) is shown.
  • Table 4 shows aspheric coefficients of predetermined surfaces of the first lens 120, the second lens 130, and the third lens 140 including aspheric surfaces in Example 2.
  • k is the conic constant
  • A is the fourth-order aspheric coefficient
  • B is the sixth-order aspheric coefficient
  • C is the eighth-order aspheric coefficient
  • D is the tenth-order aspheric coefficient. Represent.
  • FIG. 5A to FIG. 5C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 2.
  • Figure 5A shows spherical aberration
  • Figure 5B shows distortion
  • Figure 5C shows astigmatism.
  • the broken line M indicates the value of the d-line on the meridional image plane
  • the solid line S indicates the value of the d-line on the sagittal image plane.
  • Example 2 As shown in FIG. 5A to FIG. 5C, according to Example 2, various aberrations of spherical surface, distortion, and astigmatism are corrected well, and an imaging lens excellent in imaging performance can be obtained.
  • Table 5 and Table 6 show the numerical values of Example 3. Each numerical value in the example corresponds to the imaging lens 1 OOB in FIG.
  • the imaging lens 100B of FIG. 6 uses a glass having a larger Abbe number than that of Example 1 as the first lens.
  • Table 5 shows the apertures corresponding to each surface number of the imaging lens in Example 3, each lens, the radius of curvature (R: mm), the interval (D: mm), the refractive index (N), and the Abbe number ( v) is shown.
  • Table 6 shows aspheric coefficients of predetermined surfaces of the first lens 120, the second lens 130, and the third lens 140 including aspheric surfaces in Example 3.
  • k is the conic constant
  • A is the fourth-order aspheric coefficient
  • B is the sixth-order aspheric coefficient
  • C is the eighth-order aspheric coefficient
  • D is the tenth-order aspheric coefficient.
  • FIG. 7A to FIG. 7C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 3.
  • Fig. 7A shows spherical aberration
  • Fig. 7B shows distortion
  • Fig. 7C shows astigmatism.
  • the broken line M indicates the value of the d-line on the meridional image plane
  • the solid line S indicates the value on the d-line on the sagittal image plane.
  • Example 3 As shown in FIG. 7A to FIG. 7C, according to Example 3, various aberrations of spherical surface, distortion, and astigmatism are corrected well, and an imaging lens excellent in imaging performance can be obtained.
  • Tables 7 and 8 show the numerical values of Example 4. Each numerical value in the example corresponds to the imaging lens 1 OOC in FIG.
  • the imaging lens 100C in FIG. 8 uses a different resin lens from the first embodiment for the second and third lenses.
  • Table 7 shows the aperture, lens, cover glass radius of curvature (R: mm), distance (D: mm), refractive index (N), and Abbe number (corresponding to each surface number of the imaging lens in Example 4. v) is shown.
  • Table 8 shows aspheric coefficients of predetermined surfaces of the first lens 120, the second lens 130, and the third lens 140 including aspheric surfaces in Example 4.
  • k is the conic constant
  • A is the fourth-order aspheric coefficient
  • B is the sixth-order aspheric coefficient
  • C is the eighth-order aspheric coefficient
  • D is the tenth-order aspheric coefficient. Represent.
  • FIG. 9A to 9C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 4.
  • FIG. Figure 9A shows spherical aberration
  • Figure 9B shows distortion
  • Figure 9C shows astigmatism.
  • the broken line M shows the value of d-line on the meridional image plane
  • the solid line S shows the value of d-line on the sagittal image plane.
  • Table 9 and Table 10 show the numerical values of Example 5. Each numerical value in the example corresponds to the imaging lens 100D in FIG.
  • the imaging lens 100D in FIG. 10 uses a resin lens different from that in the first embodiment as the first to third lenses.
  • Table 9 shows the aperture, lens, cover glass radius of curvature (R: mm), distance (D: mm), refractive index (N), and Abbe number (corresponding to each surface number of the imaging lens in Example 5. v) is shown.
  • Table 10 shows aspheric coefficients of predetermined surfaces of the first lens 120, the second lens 130, and the third lens 140 including aspheric surfaces in Example 5.
  • k is the conic constant
  • A is the fourth-order aspheric coefficient
  • B is the sixth-order aspheric coefficient
  • C is the eighth-order aspheric coefficient
  • D is the tenth-order aspheric coefficient. Represent it.
  • FIG. 11A to FIG. 11C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 5.
  • FIG. 11A shows spherical aberration
  • FIG. 11B shows distortion
  • FIG. 11C shows astigmatism.
  • the broken line M indicates the value of the d-line on the meridional image plane
  • the solid line S indicates the value on the d-line on the sagittal image plane.
  • Example 5 As shown in FIG. 11A to FIG. 11C, according to Example 5, various aberrations such as spherical surface, distortion, and astigmatism are favorably corrected, and an imaging lens excellent in imaging performance can be obtained.
  • Tables 11 and 12 show the numerical values of Example 6. Each numerical value in the example corresponds to the imaging lens 100E in FIG.
  • Table 11 shows the radius of curvature (R: mm), distance (D: mm), refractive index (N), and Abbe number of the diaphragm, each lens, and the cover glass corresponding to each surface number of the imaging lens in Example 6. (V) is shown.
  • Table 12 shows aspherical coefficients of predetermined surfaces of the first lens 120, the second lens 130, and the third lens 140 including the aspherical surface in Example 6.
  • k is the conic constant
  • A is the fourth-order aspheric coefficient
  • B is the sixth-order aspheric coefficient
  • C is the eighth-order aspheric coefficient
  • D is the tenth-order aspheric coefficient. Represent.
  • FIG. 13A to FIG. 13C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 6.
  • Fig. 13A shows spherical aberration
  • Fig. 13B shows distortion
  • Fig. 13C shows astigmatism.
  • the broken line M indicates the value of the d-line on the meridional image plane
  • the solid line S indicates the value of the d-line on the sagittal image plane.
  • Example 6 As shown in FIG. 13A to FIG. 13C, according to Example 6, various aberrations of spherical surface, distortion, and astigmatism are corrected well, and an imaging lens excellent in imaging performance can be obtained.
  • Tables 13 and 14 show the numerical values of Example 7. Each numerical value in the example corresponds to the imaging lens 100F in FIG.
  • Table 13 shows the radius of curvature (R: mm), distance (D: mm), refractive index (N), and Abbe number of the diaphragm, each lens, and the cover glass corresponding to each surface number of the imaging lens in Example 7. (V) is shown.
  • Table 14 shows aspherical coefficients of predetermined surfaces of the first lens 120, the second lens 130, and the third lens 140 including the aspherical surface in Example 7.
  • k is the conic constant
  • A is the fourth-order aspheric coefficient
  • B is the sixth-order aspheric coefficient
  • C is the eighth-order aspheric coefficient
  • D is the tenth-order aspheric coefficient. Represent.
  • FIGS. 15A to 15C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 7.
  • FIG. 15A shows spherical aberration
  • FIG. 15B shows distortion
  • FIG. 15C shows astigmatism.
  • the broken line M indicates the value of the d line on the meridional image plane
  • the solid line S indicates the value of the d line on the sagittal image plane.
  • Example 7 As shown in FIGS. 15A to 15C, according to Example 7, even if the glass material is the same as in Example 6, if it deviates from the scope of the claims, neither the axial aberration nor the aberration can be corrected, and the imaging performance is excellent. An imaged lens cannot be obtained.
  • Table 15 and Table 16 show the numerical values of Example 8. Each numerical value in the example corresponds to the imaging lens 100G in FIG.
  • Table 15 shows the aperture corresponding to each surface number of the imaging lens in Example 8, each lens, the radius of curvature (R: mm), distance (D: mm), refractive index (N), and Abbe number of the cover glass. (V) is shown.
  • Table 16 shows aspheric coefficients of predetermined surfaces of the first lens 120, the second lens 130, and the third lens 140 including aspheric surfaces in Example 8.
  • k is the conic constant
  • A is the fourth-order aspheric coefficient
  • B is the sixth-order aspheric coefficient
  • C is the eighth-order aspheric coefficient
  • D is the tenth-order aspheric coefficient. Represent.
  • FIGS. 17A to 17C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 8.
  • FIG. FIG. 17A shows spherical aberration
  • FIG. 17B shows distortion
  • FIG. 17C shows astigmatism.
  • the broken line M indicates the value of the d-line on the meridional image plane
  • the solid line S indicates the value on the d-line on the sagittal image plane.
  • various spherical, distorted, and astigmatism aberrations are corrected favorably, and an imaging lens with excellent imaging performance can be obtained.
  • Table 17 and Table 18 show the numerical values of Example 9. Each numerical value in the example corresponds to the imaging lens 100H in FIG.
  • Table 17 shows the aperture corresponding to each surface number of the imaging lens in Example 8, each lens, the radius of curvature (R: mm), distance (D: mm), refractive index (N), and Abbe number of the cover glass. (V) is shown.
  • Table 18 shows aspheric coefficients of predetermined surfaces of the first lens 120, the second lens 130, and the third lens 140 including aspheric surfaces in Example 9.
  • k is the conic constant
  • A is the fourth-order aspheric coefficient
  • B is the sixth-order aspheric coefficient
  • C is the eighth-order aspheric coefficient
  • D is the tenth-order aspheric coefficient. Represent.
  • FIG. 19A to FIG. 19C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 9.
  • FIG. 19A shows spherical aberration
  • FIG. 19B shows distortion
  • FIG. 19C shows astigmatism.
  • the broken line M indicates the value of the d-line on the meridional image plane
  • the solid line S indicates the value on the d-line on the sagittal image plane.
  • spherical, distorted, and astigmatism aberrations are corrected well, and an imaging lens with excellent imaging performance can be obtained.
  • the imaging lens 100 includes the object-side OBJ S force arranged in order, the aperture stop 110, the first lens 120 with positive power, the power Is composed of a double-sided aspherical second lens 130 with negative power, an object-side convex double-sided aspherical third lens 140, and an imaging unit 150. It is possible to realize an imaging lens that is well corrected and has a reduced incident angle on the image plane.
  • a compact lens is achieved by optimizing the power arrangement of each lens group, and further compact lens can be realized by appropriately arranging an aspherical surface.
  • the case where the first lens 120 is also provided with an aspherical surface is described, but it may be a spherical surface. If the first lens 120 is made spherical, it will be easier to make with glass, If it is made of glass, the sensitivity can be relaxed, and if it is made of aspherical plastic, the cost is reduced and higher performance can be achieved.
  • condition of the exit pupil position with respect to the regulation of the incident angle to the image sensor 152 as a desired condition, it is possible to relax the regulation of the exit pupil while having a wide angle of view and a compact size.
  • FIG. 20 is a diagram showing a basic configuration of an imaging lens according to the second embodiment of the present invention.
  • the imaging lens 200 includes an object-side OBJS force arranged in order, a first lens 210 having a positive positive number, an aperture stop 220, and a double-sided aspheric surface having a negative power.
  • the imaging optical system of the imaging lens 200 is configured by the aspherical third lens 240.
  • the imaging optical system is arranged in order from the object-side OBJS, and each of the three lenses, ie, the first lens 210, the second lens 230, and the third lens 240, each having a single lens configuration. It is composed.
  • the first lens 210 is composed of, for example, a lens having a convex power on both the object side and the image plane side and having a positive power.
  • the second lens 230 is configured as a double-sided aspheric meniscus lens having a negative power.
  • the third lens 240 is composed of a double-sided aspheric meniscus lens having a negative power that is convex toward the object side.
  • the first lens 210 is made of grease
  • the second lens 230 and the third lens 240 are made of grease.
  • a glass parallel plane plate (cover glass) 251 and an imaging element 252 that also has, for example, a CCD or CMOS sensor are arranged in this order from the third lens 240 side.
  • the imaging optical system having the first lens 210, the second lens 230, and the third lens 240 described above has a positive, negative, and negative lens configuration as a whole. It is possible to realize an imaging lens in which various aberrations with a short overall length are corrected well and the angle of incidence on the image plane is suppressed.
  • the center curvature radius of the object side surface 11 of the first lens 210 is Rl 1
  • the center curvature of the image side surface 12 of the first lens 210 is Radius ⁇ R12 [This is the radius of curvature of the surface 13 of the aperture ⁇ 220.
  • the radius of curvature ⁇ R R13 This is the center curvature radius of the object side surface 14 of the second lens 230 to R14 and the image surface side surface 15 of the second lens 230.
  • the central radius of curvature is R15
  • the central radius of curvature of the object side surface 16 of the third lens 240 is R16
  • the central radius of curvature of the image side surface 17 of the third lens 240 is R17
  • the third radius of the cover glass 251 of the imaging unit 250 is 3rd.
  • the center curvature radius of the surface 18 on the lens 240 side is set to R18
  • the center curvature radius of the surface 19 on the image sensor 252 side of the cover glass 251 is set to R19.
  • the central curvature radius R13 of the surface 13 of the diaphragm 220 and the central curvature radii R18 and R19 of both surfaces 18 and 19 of the cover glass 251 are 0.0.
  • the refractive index of the first lens 210 is set to Nl1
  • the refractive index of the second lens 230 is set to N12
  • the refractive index of the third lens 140 is set to N13.
  • the imaging lens 200 In the imaging lens 200, light incident from the object side OBJS passes through the object side surface 11, the image surface side surface 12, and the aperture stop section 220 of the biconvex first lens 210, and the second lens has a negative power. 2 30 object side surfaces 13, image surface side surface 14, object side surface 15 of third lens 240 using resin convex to the object side, image surface side surface 16, object side surface 17 of cover glass 251 and image surface side surface 18 The light passes through and is focused on the image sensor 252.
  • the distance between the surface 11 and the surface 12 that is the thickness of the first lens 210 is Dl l
  • the distance between the surface 12 of the first lens 110 and the surface 23 of the diaphragm 220 is D22
  • the distance between the surface 23 of the diaphragm 220 and the surface 14 of the second lens 230 is D13
  • the distance between the surface 14 and the surface 15 which is the thickness of the second lens 230 is D14
  • the distance between the surface 16 of the lens 240 is D15
  • the distance between the surface 16 and the surface 17 that is the thickness of the third lens 240 is D16
  • the distance between the surface 17 of the third lens 240 and the surface 18 of the cover glass 251 is
  • the thickness of D17 and cover glass 251 is D18.
  • the imaging lens 200 according to the present embodiment having the above-described configuration realizes a compact lens so that it can be mounted on a mobile phone or the like, and various aberrations with a short overall length are favorably corrected.
  • various conditions as described below are set.
  • the first lens 210, the aperture stop 220, and the power that are biconvex on the object side and the image plane side from the object side are used.
  • a second lens (meniscus lens) 230 that is negative and a third lens (meniscus lens) 240 that is convex on the object side and has a negative power on both sides are configured.
  • the chief ray incident angle on the image plane is suppressed at each image height.
  • the reason for suppressing the incident angle is that the image pickup device can efficiently obtain the amount of light.
  • shortening the total length tends to increase the chief ray incident angle and distortion on the image plane.
  • conditional expression 9 is satisfied, where L is the total length of the distance from the stop to the image plane, and f is the focal length of the entire system.
  • each aberration cannot be corrected, and the shape problem and the shape of the periphery of the second lens 230 tend to approach the first lens 210 side.
  • the distance between the lenses in the peripheral portion is shorter than that in the central portion, making manufacturing difficult.
  • the minimum edge thickness must be secured for the sake of fluidity when using a cocoon lens.
  • conditional expression 11 is satisfied when the focal length of the third lens 240 is fl3 and the focal length of the entire system is f. fl3 / f ⁇ -15. 0... (conditional expression 11)
  • This condition is intended to facilitate the assembly process by reducing the power of the third lens 240. If power is evenly distributed to the first lens 210, the second lens 230, and the third lens 240, each lens is controlled, and the combination becomes a great amount when considering mass production.
  • the first lens 210 and the second lens 230 are given high power and the sensitivity is tightened to give the third lens 240 freedom. In this way, it is possible to concentrate on controlling the first lens 210 and the second lens 230.
  • the focal length of the first lens 210 and the second lens 230 is set for the focal length of the first lens 210 and the second lens 230 and the overall focal length.
  • the power of the first lens 210 is positive, the power of the second lens 230 is negative, and the power of the third lens 240 is negative, which satisfies one of the following conditional expressions: It is constructed so that various aberrations can be corrected satisfactorily with the power arrangement.
  • the third lens 240 is made smaller.
  • conditional expressions 12 and 13 are satisfied in the imaging optical system.
  • f represents the focal length of the entire system
  • f 11 represents the focal length of the first lens 210
  • f 12 represents the focal length of the second lens 230.
  • the central curvature radius of the central portion and the curvature of the peripheral portion on the image plane side surface of the second lens and the third lens of the imaging optical system are preferably used. It has surfaces with different signs of radius.
  • a force that is positive in the vicinity of the paraxial axis must be applied with the ray AX off-axis in the vicinity, so it must have a negative power.
  • the third lens 240 needs to have an inflection point at the periphery and make the power positive to reduce the angle and the incident angle of the light beam.
  • the Abbe number V of 140 is configured to satisfy the following conditions.
  • the third lens 140 it is preferable to use a resin lens in terms of structural and cost.
  • the third lens 240 corrects the aberration that occurs in the first lens 210 and the second lens 230, which is a three-lens configuration of the imaging optical system.
  • the third lens 240 must have a shape with an inflection point that is quite difficult to mold. If the aspheric coefficient is also suppressed to a low order, it is difficult to achieve performance. Therefore, it is difficult to mold the third third lens with glass, so we are using a lens.
  • the first first lens 210 is preferably glass. By not using plastic, the number of glass materials that can be selected increases and flexibility increases.
  • the first sheet is also affected by ultraviolet rays, it is preferable to use glass with less performance deterioration than plastic.
  • the use of a high-refractive material suppresses the curvature, and the use of a spherical surface, which is also considered when manufacturing, makes the tolerances looser.
  • cost is a priority, it is desirable to use plastic.
  • the second lens 230 of the second lens cannot be corrected with the two aspheric surfaces of the third lens 240 of the third lens! / Both surfaces are aspherical in order to correct various aberrations.
  • Performance can be maintained by managing 30 shapes and eccentricity.
  • conditional expression 5 is set to [V (max) — v (min) ⁇ 25] in order to correct the color with less freedom of Abbe number with grease This is because if there is no difference that satisfies the conditional expression between the first lens 210 or the second second lens 230, there is a possibility that the correction cannot be made.
  • the aspherical shape of the lens is positive when the direction from the object side to the image surface side is positive, and k is a circle.
  • A, B, C, and D are aspherical coefficients, and r is the central radius of curvature, h is the height of the light beam, and c is the reciprocal of the central radius of curvature.
  • Z is the depth of the tangential force on the surface vertex
  • A is the fourth-order aspheric coefficient
  • B is the sixth-order aspheric coefficient
  • C is the eighth-order aspheric coefficient
  • D is the tenth-order aspheric coefficient
  • the aperture stop 220 between the first lens 210 and the second lens 230, the total length is shortened and the exit pupil is lengthened, so that the entrance to the image sensor 252 is achieved.
  • the angle can be made as small (shallow) as possible.
  • the distance D12 between the first lens 210 and the aperture stop 220, and the distance between the surface 17 and the surface 18 that are closest to each other are secured to secure the autofocus feed amount! /
  • the aperture lens 220, the lenses 210, 230, and 240, which are included in each lens group of the imaging lens 200, are arranged on the canopy glass 25 1 that constitutes the imaging lens 250.
  • surface numbers as shown in FIG. 21 were assigned.
  • Table 19 and Table 20 show the numerical values of Example 10. Each numerical value in the example corresponds to the imaging lens 200 in FIG. In Example 10, the first lens 210, the second lens 230, and the third lens 240 were formed by grease.
  • Table 19 shows the aperture, lens, and force bar glass radius of curvature (R: mm), spacing (D: mm), refractive index (N), and dispersion value corresponding to each surface number of the imaging lens in Example 10. (Azbek number (V)).
  • Table 20 shows aspheric coefficients of predetermined surfaces of the first lens 210, the second lens 230, and the third lens 240 including the aspheric surfaces in Example 10.
  • k is the conic constant
  • A is the fourth-order aspheric coefficient
  • B is the sixth-order aspheric coefficient
  • C is the eighth-order aspheric coefficient
  • D is the tenth-order aspheric coefficient. Represent.
  • FIG. 22A to 22C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 10.
  • FIG. Figure 22A shows spherical aberration (per wavelength)
  • Figure 22B shows distortion
  • Figure 22C shows Astigmatism is shown respectively.
  • the broken line indicates the sine condition.
  • the broken line M indicates the value of the d-line on the meridional image plane
  • the solid line S indicates the value of the d-line on the sagittal image plane!
  • various aberrations of spherical surface, distortion, and astigmatism are favorably corrected, and an imaging lens having excellent imaging performance can be obtained.
  • Table 21 and Table 22 show the numerical values of Example 11. Each numerical value in the example corresponds to the imaging lens 200A in FIG.
  • the imaging lens 200A of FIG. 23 is an example in which the overall length is shorter than that of the tenth embodiment.
  • Table 21 shows the aperture, lens, and force bar glass radius of curvature (R: mm), spacing (D: mm), refractive index (N), and dispersion value corresponding to each surface number of the imaging lens in Example 11. (Azbek number (V)).
  • Table 22 shows aspheric coefficients of predetermined surfaces of the first lens 210, the second lens 230, and the third lens 240 including the aspherical surface in Example 11.
  • k is the conic constant
  • A is the fourth-order aspheric coefficient
  • B is the sixth-order aspheric coefficient
  • C is the eighth-order aspheric coefficient
  • D is the tenth-order aspheric coefficient. Represent.
  • FIG. 24A to 24C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 11.
  • FIG. 24A shows spherical aberration (per wavelength)
  • FIG. 24B shows distortion
  • FIG. 24C shows astigmatism.
  • the broken line indicates the sine condition.
  • the broken line M indicates the value of the d-line on the meridional image plane
  • the solid line S indicates the value on the d-line on the sagittal image plane!
  • an imaging lens excellent in imaging performance can be obtained by properly correcting the various differences of spherical surface, distortion, and astigmatism.
  • Table 23 and Table 24 show the numerical values of Example 12. Each numerical value in the example corresponds to the imaging lens 200B in FIG.
  • the imaging lens 200B of FIG. 25 uses a glass having a lower dispersion value (Abbe number) than that of Example 10 for the first lens 210.
  • Table 23 shows the aperture corresponding to each surface number of the imaging lens in Example 12, each lens, and the radius of curvature (R: mm), distance (D: mm), refractive index (N), and dispersion value of the bar glass. (Azbek number (V)).
  • Table 24 shows aspherical coefficients of predetermined surfaces of the first lens 210, the second lens 230, and the third lens 240 including the aspherical surface in Example 12.
  • k is the conic constant
  • A is the fourth-order aspheric coefficient
  • B is the sixth-order aspheric coefficient
  • C is the eighth-order aspheric coefficient
  • D is the tenth-order aspheric coefficient. Represent.
  • FIG. 26A to FIG. 26C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 12.
  • FIG. Figure 26A shows spherical aberration (per wavelength)
  • Figure 26B shows distortion
  • Figure 26C shows Astigmatism is shown respectively.
  • the broken line indicates the sine condition.
  • the broken line M indicates the value of the d-line on the meridional image plane
  • the solid line S indicates the value of the d-line on the sagittal image plane.
  • Example 12 As shown in FIG. 26A to FIG. 26C, according to Example 12, the various differences of spherical surface, distortion, and astigmatism are favorably corrected, and an imaging lens excellent in imaging performance can be obtained.
  • Example 13 Each numerical value in Example 13 corresponds to the imaging lens 200C in FIG.
  • the imaging lens 200C in FIG. 27 uses an inexpensive glass mold material for the first lens 210.
  • Table 25 shows the aperture, lens, and force bar glass radius of curvature (R: mm), spacing (D: mm), refractive index (N), and dispersion value corresponding to each surface number of the imaging lens in Example 13. (Azbek number (V)).
  • Table 26 shows aspheric coefficients of predetermined surfaces of the first lens 210, the second lens 230, and the third lens 240 including the aspheric surfaces in Example 13.
  • k is the conic constant
  • A is the fourth-order aspheric coefficient
  • B is the sixth-order aspheric coefficient
  • C is the eighth-order aspheric coefficient
  • D is the tenth-order aspheric coefficient. Represent.
  • FIG. 28A to 28C are aberration diagrams showing spherical aberration, distortion, and astigmatism in Example 13.
  • FIG. 28A shows spherical aberration (per wavelength)
  • FIG. 28B shows distortion
  • FIG. 28C shows astigmatism.
  • the broken line indicates the sine condition.
  • the broken line M shows the value of d-line on the meridional image plane
  • the solid line S shows the value on d-line on the sagittal image plane!
  • an imaging lens excellent in imaging performance can be obtained by properly correcting various differences of spherical surface, distortion, and astigmatism.
  • the imaging lens 200 is arranged in the order of the object-side OBJ S force, the first lens 210 having a positive power, the aperture stop unit 220, the power Is composed of a double-sided aspherical second lens 230 with negative power, an object-side convex double-sided aspherical third lens 240, and an imaging unit 250. It is possible to realize an imaging lens that is well corrected and has a reduced incident angle on the image plane.
  • a compact lens is achieved by optimizing the power arrangement of each lens group, and further compact lens can be realized by appropriately arranging an aspherical surface.
  • the case where the first lens 210 also has an aspherical surface is described. However, it may be spherical. If the first lens 210 is made spherical, it will be easier to make with glass, if made with glass it will be less sensitive, and if made with aspherical plastic, the cost will be reduced and higher performance will be achieved. Can do.
  • the imaging lenses 100, 100A to 100H, 200, 200A to 200C having the characteristics as described above are not restricted in the total length such as a digital still camera, a camera mounted on a mobile phone, a camera mounted on a portable information terminal using the image sensor. It can be applied to strict imaging devices.
  • FIGS. 29 and 30 are external perspective views showing an embodiment of a mobile phone equipped with a camera (optical) module that employs the imaging lens according to the present embodiment.
  • the cellular phone 301 is configured as a so-called foldable cellular phone.
  • FIG. 29 shows an open state
  • FIG. 30 shows a closed state.
  • the mobile phone 301 includes a receiving case 302 and a transmitting case 303, and the receiving case 302 and the transmitting case 303 are connected to each other by a connecting unit 304 so as to be opened and closed.
  • the receiving case 302 and the transmitting case 303 are provided with front side cases 302c and 303c on the side (front side) facing each other in the closed state, and back side cases 302d and 303d on the back side. Yes.
  • These cases are integrally formed by, for example, a resin.
  • a main display unit 305 that displays an image on the front side and a sub display unit 306 that displays an image on the back side thereof are provided along each surface.
  • the main display unit 5 and the sub display unit 306 are configured by a liquid crystal display, for example.
  • the receiver case 302 is provided with an optical module 307 for imaging a subject from an opening 302e provided in the back side case 302d, and a strobe 308 that also emits back side force.
  • the transmitter case 303 includes an operation unit 309 on the front side.
  • Various buttons for operating the cellular phone 301 such as a numeric keypad button 309a are arranged on the operation unit 309.
  • Mobile phone The telephone 301 performs radio communication or imaging using the optical module 7 in response to an input operation to the numeric keypad 309a.
  • the mobile phone 301 is provided with a high-frequency circuit and antenna for wireless communication, a microphone and a speaker for calling, and the like is not shown.
  • a force operation unit 309 (not shown) has a cover on the opposite surface, and when the cover is opened, there is a battery storage unit that stores a battery as power supply means.
  • a battery storage unit that stores a battery as power supply means.
  • the imaging lens 100, 10 OA ⁇ : L00H, 200, 200A-200C according to the present embodiment is employed in the optical module 307.
  • FIG. 31A is a schematic perspective view of the optical module 307
  • FIG. 31B is a cross-sectional view taken along the line III--X in FIG. 31A.
  • the y-axis direction of the Cartesian coordinate system set in FIG. 31A and FIG. 31B is the optical axis direction
  • the lower left side of FIG. 31A and the upper side of FIG. 31B are the object side (object side; upper side of FIG. 30). ).
  • FIG. 32 is a perspective view of the internal configuration of the lens unit on which the imaging lens of this embodiment is mounted as viewed from the object side (subject side).
  • the optical module 307 has a subject side cover 311, shirt unit 312, lens unit 314, substrate cover 315, and substrate 316 stacked in this order along the optical axis!
  • the overall shape is generally formed in a thin rectangular parallelepiped that is thin in the optical axis direction.
  • the subject side cover 311, the lens unit 314, the substrate cover 315, and the substrate 316 are formed in a substantially rectangular shape having substantially the same size when viewed in the optical axis direction.
  • the side surface constitutes the side surface of the entire shape
  • the subject side cover 311 and the substrate 316 constitute the surface of the subject side of the overall shape and its back surface.
  • the optical module 307 is configured as a relatively small module.
  • the area perpendicular to the optical axis is 22 mm ⁇ 16 mm, and the thickness in the optical axis direction is 6.9 mm.
  • the optical module 307 has a built-in motor 313 for driving the lens in the optical axis direction as shown in FIGS. 31B and 32. Adjustment is possible.
  • the subject-side cover 311 is formed in a rectangular box shape as a whole, and has a plate surface 31 la on the subject side and a side surface surrounding the outer periphery of the plate surface 31 la. At one end in the x-axis direction, a rectangular opening that is approximately half the size of the subject-side cover 311 opens, and most of the shirt unit 312 is exposed.
  • the subject side cover 311 is made of, for example, metal. In the optical module 307, the subject side cover 311 may be omitted.
  • the shirter unit 312 is formed in a thin, substantially rectangular parallelepiped shape having an outer shape that is approximately half as wide as the lens unit 314 as a whole.
  • a circular recess 31 2a centering on the optical path is provided, and a lens group 3 21 corresponding to the imaging lens of the present embodiment is inserted into the recess 312a, and the recess 312a can also define a part of the moving region of the lens group 321.
  • the motor 313 is arranged in parallel with the shirter unit 312 with respect to the optical axis, that is, the subject of the lens unit 314 so that the shirter unit 312 and the motor 313 are arranged in a direction orthogonal to the optical axis. On the side. Further, the motor 313 is located on the radially outer side of the lens group 321.
  • the lens unit 314 includes a lens group 321, a lens holder 322 that holds the lens group 321, and a lens holder 322 that is movably held in the optical axis direction of the lens group 321. And a substrate.
  • the lens group 321 includes, for example, three optical lenses. From the subject side, the first lens 323 (the first lens 120 in FIG. 1, etc., the First lens 210), second lens 324 (second lens 130 in FIG. 1, etc., second lens 230 in FIG. 20, etc.), third lens 325 (third lens 140 in FIG. 1, etc., first lens in FIG. 20, etc. Three lenses 240) are stacked in this order.
  • the first lens 323, the second lens 324, and the third lens 325 are configured so that the diameter gradually increases from the subject side.
  • a single lens may be held by the lens holder 322.
  • the lens holding body 322 has a circular recess that is reduced in a stepped shape so that the lenses 323, 324, and 325 are fitted and inserted, respectively.
  • the first lens 323, the second lens 324, and the third lens 325 are housed and stacked in this concave portion in this order, and a ring-shaped retainer 326 is stacked, and the retainer 326 is bonded to the lens holder 322.
  • the lens group 321 is held by the lens holder 322 by being fixed by a fixing means such as an agent.
  • the lens holder 322 is made of, for example, a resin.
  • the substrate cover 315 is formed of, for example, grease, and is generally a thin rectangular parallelepiped.
  • the substrate cover 315 is provided with an opening 315a for securing an optical path.
  • a plurality of recesses 315b capable of accommodating various components provided on the substrate 316 are provided on the substrate 316 side of the substrate cover 315.
  • An IR cut filter is provided on the lens unit 314 side of the substrate cover 315.
  • the substrate 316 is configured as a rigid substrate by a hard substrate material, and is formed in a substantially rectangular shape as a whole.
  • the substrate 316 is a multilayer printed board in which a nonturn layer, a ground layer, and a power supply layer are stacked on an insulating layer formed of, for example, hard resin.
  • the substrate 316 constitutes a surface opposite to the subject side in the overall shape of the optical module 307, and the optical module 307 is mounted on the mobile phone 301.
  • the surface 316a opposite to the subject side of the substrate 316 is in contact with an appropriate member such as a substrate (not shown) provided inside the mobile phone 1, and is held by the mobile phone 1.
  • the flexible printed wiring board (FPC327) is provided with a connector 328 for connecting to a board or the like provided inside the mobile phone 1.
  • the image sensor 329 is formed by a CCD or CMOS sensor, for example, and outputs a signal corresponding to the received light.
  • the signal output from the image sensor 329 is output to the image processing unit provided on the substrate for the display unit of the mobile phone 1 via the substrate 316 and the FPC 327 and processed.
  • the optical image is displayed on the main display unit 305 or the sub display unit 306.
  • the image sensor 329 corresponds to the image sensor 150 of the image pickup lenses 100 and 100A to 100H in FIG. 1 and the like, and the image sensor 250 of the image pickup lenses 200 and 200A to 200C in FIG.
  • the lens holder 322 includes guided portions 322a and 322b that protrude outward in the radial direction of the lens 321.
  • a through hole 322c is provided in the guided portion 322a, and a guide shaft 351 is passed through the through hole 322c.
  • the guide shaft 3351 extends in the optical axis direction and is fixed to the lens base, and guides the guided portion 22a in the optical axis direction.
  • the guided portion 322b is inserted into a concave rail portion provided in the lens base.
  • the motor 313 is formed of, for example, a stepping motor, and includes a motor main body 313a including a rotor and the like, and an output shaft 313b extending from the motor main body 313a and driven to rotate.
  • the motor body 313a is formed, for example, in a substantially cylindrical shape, and the output shaft 313b extends from the end surface of the cylindrical shape.
  • the length of the motor body 313a in the direction of the output shaft 313b is larger than the width in the direction perpendicular to the output shaft 313b.
  • the length obtained by integrating the length of the motor body 313a and the length of the output shaft 313b is larger than the diameter of the lens group 321.
  • the width in the direction perpendicular to the output shaft 313b of the motor body 313a is the light of the lens group 321. Less than the axial thickness (see Figure 31B)
  • the motor 313 is arranged to extend along a direction (z-axis direction) orthogonal to the output shaft 313b force optical axis and orthogonal to the arrangement direction with the shirter unit 312.
  • the overall shape of the motor 313 is arranged so that the longitudinal direction is perpendicular to the optical axis and the lateral direction is parallel to the optical axis.
  • a terminal folder 352 is provided on the side of the motor body 313a opposite to the shirter unit 312.
  • the terminal 352a of the terminal folder 352 is connected to the FPC.
  • the operation of the motor 313 is performed by the control unit (not shown) of the mobile phone 301 by the FPC 327 or the board.
  • the lens unit 314 is provided with a transmission mechanism 353 that converts the rotation of the output shaft 313b of the motor 313 into a linear motion in the optical axis direction and transmits the linear motion to the lens holder 322. Yes.
  • the transmission mechanism 353 includes a worm 354 provided on the output shaft 313b of the motor 313, a worm wheel 355 that meshes with the worm 354, and a cam gear 356 that meshes with the worm wheel 355.
  • the worm 354, worm wheel 355 and cam gear 356 are It functions as a cam drive unit that drives a cam unit 356b described later.
  • the worm 354 and the worm wheel 355 constitute a worm gear device, which converts rotation about an axis orthogonal to the optical axis of the output shaft 313b into rotation about an axis parallel to the optical axis. That is, the worm 354 rotates about an axis orthogonal to the optical axis, and the worm wheel 355 rotates about an axis parallel to the optical axis by the driving force transmitted by the worm 354.
  • the lens unit 314 is provided with a photoelectric sensor 361 for detecting the rotational position of the cam gear 356 and thus detecting the position of the lens holder 322 in the optical axis direction. It has been.
  • the cam gear 356 includes a gear portion 356a in a part of the outer peripheral portion and a cam portion 356b in the other part of the outer peripheral portion.
  • the gear part 356a and the cam part 356b are formed over substantially half the circumference of the cam gear 356, respectively.
  • the gear portion 356a meshes with the worm wheel 355, and the cam gear 356 rotates around an axis parallel to the optical axis.
  • the cam portion 356b has a cam surface 356c that is inclined with respect to a surface orthogonal to the rotation axis of the cam gear 356, that is, inclined to a surface orthogonal to the optical axis.
  • the lens holder 322 has a contact portion 322d that contacts the cam surface 356c, and the contact portion 322d can slide on the cam surface 356c as the cam gear 356 rotates.
  • the imaging lenses 100, 100A to 100H, 200, 200A to 200C of the present embodiment have a total length that is the same as that of a digital still camera, a mobile phone mounted camera, or a mobile information terminal mounted camera using an image sensor. It can be easily mounted on imaging devices with strict regulations.
  • the imaging lenses 100, 100A to 100H, 200, 200A to 200C have high optical performance as well as having a suitable overall lens length that can be mounted on a mobile phone or the like. An image can be obtained.
  • the imaging lens, the optical module, and the mobile terminal of the present invention have a short overall length and various aberrations are favorably corrected and the incident angle on the image plane can be suppressed, a digital still camera or a mobile phone camera It can be applied to the U-Shooting device with strict regulation of the total length, which is different from the camera equipped with portable information terminal.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

Lentille de capteur d'image de longueur générale courte dans laquelle diverses aberrations sont corrigées et un angle incident au plan d'image est contrôlé. L'invention concerne également un module d'image et un terminal portable. La lentille de capteur d'image (100) comprend une partie d'arrêt d'ouverture (110), une première lentille (120) de puissance positive, une deuxième lentille asphérique double (130) de puissance négative, une troisième lentille asphérique double (140) de puissance négative convexe sur le côté objet, et une partie de capteur d'image (150) agencée séquentiellement depuis le côté objet OBJS.
PCT/JP2006/314891 2005-07-27 2006-07-27 Lentille de capteur d’image, module optique et terminal portable Ceased WO2007013557A1 (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP2005217805 2005-07-27
JP2005-217805 2005-07-27
JP2005313757 2005-10-28
JP2005-313757 2005-10-28
JP2005-344307 2005-11-29
JP2005344307A JP2007058153A (ja) 2005-07-27 2005-11-29 撮像レンズ、光学モジュール、および携帯端末
JP2006016452A JP2007148315A (ja) 2005-10-28 2006-01-25 撮像レンズ、光学モジュール、および携帯端末
JP2006-016452 2006-01-25

Publications (1)

Publication Number Publication Date
WO2007013557A1 true WO2007013557A1 (fr) 2007-02-01

Family

ID=37683448

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2006/314891 Ceased WO2007013557A1 (fr) 2005-07-27 2006-07-27 Lentille de capteur d’image, module optique et terminal portable

Country Status (1)

Country Link
WO (1) WO2007013557A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008197264A (ja) * 2007-02-09 2008-08-28 Fujinon Corp 撮像レンズ
CN102650727A (zh) * 2011-02-28 2012-08-29 康达智株式会社 摄像镜头
CN104252034A (zh) * 2013-06-26 2014-12-31 大立光电股份有限公司 结像镜片系统镜组及取像装置
CN119065085A (zh) * 2023-05-30 2024-12-03 华为技术有限公司 成像镜头、摄像头模组及电子设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57195212A (en) * 1981-05-26 1982-11-30 Olympus Optical Co Ltd Image formimg lens
JP2004341501A (ja) * 2003-04-22 2004-12-02 Olympus Corp 結像光学系及びそれを用いた電子機器
JP2005227755A (ja) * 2004-01-13 2005-08-25 Miyota Kk 小型結像レンズ
EP1589362A1 (fr) * 2004-04-23 2005-10-26 Enplas Corporation Objectif composé de trois lentilles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57195212A (en) * 1981-05-26 1982-11-30 Olympus Optical Co Ltd Image formimg lens
JP2004341501A (ja) * 2003-04-22 2004-12-02 Olympus Corp 結像光学系及びそれを用いた電子機器
JP2005227755A (ja) * 2004-01-13 2005-08-25 Miyota Kk 小型結像レンズ
EP1589362A1 (fr) * 2004-04-23 2005-10-26 Enplas Corporation Objectif composé de trois lentilles

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008197264A (ja) * 2007-02-09 2008-08-28 Fujinon Corp 撮像レンズ
CN102650727A (zh) * 2011-02-28 2012-08-29 康达智株式会社 摄像镜头
CN102650727B (zh) * 2011-02-28 2016-09-14 康达智株式会社 摄像镜头
CN105938239A (zh) * 2011-02-28 2016-09-14 康达智株式会社 摄像镜头
CN104252034A (zh) * 2013-06-26 2014-12-31 大立光电股份有限公司 结像镜片系统镜组及取像装置
CN119065085A (zh) * 2023-05-30 2024-12-03 华为技术有限公司 成像镜头、摄像头模组及电子设备

Similar Documents

Publication Publication Date Title
CN208654428U (zh) 摄像镜头
JP5475978B2 (ja) 撮像レンズ、およびカメラモジュールならびに撮像機器
CN101344632B (zh) 摄像透镜、照相机模组以及摄像设备
CN206788445U (zh) 摄像镜头
CN112596219A (zh) 摄像镜头
JP5090832B2 (ja) 撮像レンズ、およびカメラモジュールならびに撮像機器
WO2007018085A1 (fr) Dispositif d’imagerie et procédé d’assemblage pour dispositif d’imagerie
JP5022172B2 (ja) ４枚構成小型撮像レンズ、およびカメラモジュールならびに撮像装置
CN105938239A (zh) 摄像镜头
JP2007298572A (ja) 撮像レンズ、光学モジュール、および携帯端末
CN113671671B (zh) 摄像镜头
JP2009069195A (ja) 撮像レンズ、およびカメラモジュールならびに撮像機器
CN103201665A (zh) 摄像光学系统和光学调整方法
JP2009069194A (ja) 撮像レンズ、およびカメラモジュールならびに撮像機器
JP2009069193A (ja) 撮像レンズ、およびカメラモジュールならびに撮像機器
JP2007264498A (ja) 撮像レンズ、光学モジュール、および携帯端末
JP4947580B2 (ja) 撮像レンズ、光学モジュール、および携帯端末
JP2008107616A (ja) 撮像レンズ、光学モジュール、および携帯端末
JP2007178689A (ja) 撮像レンズ、光学モジュール、および携帯端末
JP2007225833A (ja) 撮像レンズ、光学モジュール、および携帯端末
JP2008064884A (ja) 撮像レンズ
JP2009145597A (ja) 撮像レンズ、撮像ユニット、及び該撮像ユニットを搭載した携帯型情報端末
JP2009098515A (ja) ４枚構成小型撮像レンズ、およびカメラモジュールならびに撮像装置
CN101238401A (zh) 摄像装置和摄像装置的组装方法
JP2007148314A (ja) 撮像レンズ、光学モジュール、および携帯端末

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 06781802

Country of ref document: EP

Kind code of ref document: A1