WO2012053367A1 - 撮像レンズ、撮像装置及び携帯端末 - Google Patents
撮像レンズ、撮像装置及び携帯端末 Download PDFInfo
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- WO2012053367A1 WO2012053367A1 PCT/JP2011/073060 JP2011073060W WO2012053367A1 WO 2012053367 A1 WO2012053367 A1 WO 2012053367A1 JP 2011073060 W JP2011073060 W JP 2011073060W WO 2012053367 A1 WO2012053367 A1 WO 2012053367A1
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- Prior art keywords
- lens
- imaging
- image
- imaging lens
- refractive power
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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
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
- H04M1/0264—Details of the structure or mounting of specific components for a camera module assembly
Definitions
- the present invention relates to a small imaging lens suitable for an imaging apparatus using a solid-state imaging device such as a CCD image sensor or a CMOS image sensor.
- an imaging lens used in such a high-definition solid-state imaging device is required to have high resolution.
- the resolving power is limited by the F value, and in order to obtain a high resolving power, a conventional F value of about F2.8 is insufficient, and a bright lens with a small F value is appropriate.
- a bright imaging lens of F2 or less that is suitable for a solid-state imaging device having a high pixel count and a reduced pixel size.
- an imaging lens having a five-lens configuration has been proposed that can have a large aperture ratio and high performance as compared with a lens having three or four lenses.
- a five-lens imaging lens in order from the object side, a first lens having positive or negative refractive power, a front group consisting of a second lens having positive refractive power, an aperture stop, and a third lens having negative refractive power
- an imaging lens including a rear group including a fourth lens having a positive refractive power and a fifth lens having a negative or positive refractive power (see, for example, Patent Documents 1 and 2).
- the imaging lens described in the above-mentioned Patent Document 1 has a spherical front system, if it is brightened to about F2, correction of spherical aberration and coma aberration is insufficient and good performance cannot be ensured. Also, because the front group and rear group have positive refractive power, the main point position of the optical system is on the image side and back focus compared to the configuration of the telephoto type where the rear group has negative refractive power. This is a disadvantageous type for downsizing.
- the imaging lens described in Patent Document 2 has a brightness of about F2, but since the first lens and the second lens have positive refractive power, color correction in the front group is possible. It is insufficient. Further, as in Patent Document 1, both the front group and the rear group have a positive refractive power, and the final lens is also a positive lens, which is a disadvantageous type for downsizing.
- the imaging lens described in Patent Document 3 has a brightness of about F2, it has a four-lens configuration, so aberration correction is insufficient, and is suitable for an imaging lens that supports high pixel count. It's hard to say.
- the present invention is a small image pickup lens having sufficient brightness of F2 or less and having various aberrations corrected well, an image pickup apparatus having the image pickup lens, and a mobile phone having the image pickup apparatus.
- the purpose is to provide a terminal.
- the present invention aims at miniaturization at a level satisfying the following expression. By satisfying this range, the entire imaging apparatus can be reduced in size and weight.
- L Distance on the optical axis from the most object-side lens surface to the image-side focal point of the entire imaging lens system 2Y: diagonal length of the imaging surface of the solid-state imaging device (diagonal length of the rectangular effective pixel region of the solid-state imaging device)
- the image-side focal point refers to an image point when a parallel light beam parallel to the optical axis is incident on the imaging lens.
- the imaging lens is parallel.
- the flat plate portion is calculated as the above L value after the air conversion distance.
- the imaging lens according to claim 1 is an imaging lens for forming a subject image on a photoelectric conversion unit of a solid-state imaging device, and has a positive refractive power in order from the object side and a convex surface directed toward the object side.
- the fourth lens is a fifth lens having a negative refractive power and a concave surface facing the image side.
- the image side surface of the fifth lens is aspherical and changes to a position other than the intersection with the optical axis. It has a curvature point and satisfies the following conditional expression. 1.5 ⁇ f12 / f ⁇ 3.0 (1) However, f12: Composite focal length of the first lens and the second lens f: Focal length of the entire imaging lens system
- the basic configuration of the present invention for obtaining a small imaging lens with good aberration correction is a first lens having a positive refractive power and a convex surface facing the object side, and having a negative refractive power and an object side.
- a fifth lens having a concave surface on its side.
- a so-called telephoto type lens configuration in which a positive lens group including a first lens, a second lens, a third lens, and a fourth lens and a negative fifth lens are arranged is the total length of the imaging lens. This is an advantageous configuration for downsizing.
- the number of surfaces having a diverging action is increased to facilitate correction of the Petzval sum, and good imaging performance is ensured up to the periphery of the screen.
- An imaging lens can be obtained.
- the composite principal point position of the entire imaging lens system can be arranged closer to the object side, and the image side surface of the second lens can be a strong divergence surface, and coma aberration and distortion can be achieved. This makes it easy to correct aberrations.
- the “inflection point” is a point on the aspheric surface where the tangent plane of the aspherical vertex is a plane perpendicular to the optical axis in the curve of the lens cross-sectional shape within the effective radius.
- Conditional expression (1) sets the combined focal length of the first lens and the second lens appropriately, suppresses higher-order spherical aberration and coma, which are problems with large-aperture lenses, and shortens the total length of the imaging lens. This is a conditional expression for achieving compatibility.
- the positive composite focal length of the first lens and the second lens does not become unnecessarily small, and higher-order spherical aberration that occurs in the first lens and the second lens,
- the coma aberration can be suppressed to a small value, and by appropriately suppressing the refractive power of each of the first lens and the second lens, the image plane variation with respect to the manufacturing error can be reduced.
- the positive combined focal length of the first lens and the second lens can be appropriately maintained by being below the upper limit, the principal point position of the entire system can be arranged on the object side, and the imaging lens The overall length can be shortened.
- the imaging lens described in claim 2 is characterized in that, in the invention of claim 1, the following conditional expression is satisfied. 0.15 ⁇ d5 / f ⁇ 0.35 (2) However, d5: thickness of the third lens on the optical axis f: focal length of the entire imaging lens system
- Conditional expression (2) is a conditional expression for appropriately setting the thickness of the third lens on the optical axis.
- the positive refractive power at the periphery of the image side surface is stronger than that at the center of the image side surface.
- the part has a shape that greatly falls to the object side. Then, the flange thickness outside the effective diameter of the third lens tends to be thin, which causes the moldability to be impaired.
- the thickness on the optical axis of the third lens can be appropriately maintained, and the effective diameter can be increased even if the positive refracting power at the periphery of the image side surface of the third lens is increased. It becomes easy to secure the outer flange thickness.
- the thickness of the third lens on the optical axis is not excessively increased, the clearance between the front and rear lenses of the third lens can be appropriately maintained, and the overall length of the imaging lens can be shortened.
- f focal length of the entire imaging lens system
- f3 focal length of the third lens
- Conditional expression (3) is a conditional expression for setting the focal length of the third lens appropriately to achieve both shortening of the entire length of the imaging lens and aberration correction.
- conditional expression (3) exceeds the lower limit, the refractive power of the third lens can be maintained moderately, which is advantageous for aberration correction.
- the refractive power of the third lens does not become too strong, and the entire length of the imaging lens can be shortened.
- f34 Composite focal length of the third lens and the fourth lens f: Focal length of the entire imaging lens system
- Conditional expression (4) is a conditional expression for appropriately setting the combined focal length of the third lens and the fourth lens.
- conditional expression (4) exceeds the lower limit, the combined refractive power of the third lens and the fourth lens does not become too strong, and the principal point position of the entire imaging lens system can be arranged closer to the object side.
- the overall length of the imaging lens can be shortened. Further, coma and field curvature generated in the fourth lens can be suppressed to a small level.
- the combined refractive power of the third lens and the fourth lens can be appropriately maintained, and the peripheral luminous flux jumped up by the second lens can be smoothly guided to the fifth lens. Therefore, it is easy to secure the image side telecentric characteristics.
- the imaging lens according to claim 5 is characterized in that, in the invention according to any one of claims 1 to 4, the fourth lens has a biconvex shape.
- the refractive power of the fourth lens can be increased, and the light beam near the optical axis is strongly refracted, so that a configuration advantageous for a large aperture is obtained.
- Conditional expression (5) is a conditional expression for appropriately setting the Abbe number of the fifth lens.
- the imaging lens according to any one of the first to sixth aspects, wherein the imaging lens is located closer to the image side than the position on the optical axis of the object side surface of the first lens, An aperture stop is disposed closer to the object side than the outermost periphery.
- the aperture stop By disposing the aperture stop on the image side from the position on the optical axis of the object side surface of the first lens and on the object side from the most peripheral part of the object side surface of the first lens, the refraction angle on the object side surface of the first lens Therefore, it is possible to suppress the occurrence of higher-order spherical aberration and coma generated in the first lens.
- the height of the light beam passing through the first lens can be reduced, the edge thickness of the first lens can be easily ensured, and the moldability can be improved. This is an important requirement especially for large-aperture optical systems.
- An imaging lens according to an eighth aspect of the present invention is the imaging lens according to any one of the first to seventh aspects, wherein the first lens, the second lens, and the fifth lens of the imaging lens are fixed with respect to the imaging surface, Focusing is performed by moving the fourth lens integrally in the optical axis direction.
- the optical unit can be made very compact. Furthermore, it is possible to prevent dust from entering the imaging lens unit, and it is possible to reduce the environmental load by reducing costs by eliminating processes and reducing defects.
- the imaging lens according to claim 9 is the invention according to any one of claims 1 to 8, wherein all of the third lens, the fourth lens, and the fifth lens of the imaging lens intersect with the optical axis of at least one surface. It has an inflection point at a position other than.
- the third lens, the fourth lens, and the fifth lens all have inflection points at positions other than the intersection with the optical axis of at least one side surface, so that the third lens, which is important for correcting off-axis aberrations, is fifth.
- Refracting power can be changed near the center and around the lens up to the lens, making it easier to correct field curvature and distortion of the light beam passing near the inflection point, improving design flexibility. Will be able to.
- the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all formed of a plastic material. It is characterized by.
- An imaging apparatus includes the imaging lens according to any one of the first to tenth aspects and a solid-state imaging element disposed on an image side of the imaging lens.
- an imaging apparatus having an imaging lens that is small in size and has sufficient brightness of F2 or less and in which various aberrations are well corrected.
- the position of the imaging lens on the optical axis of the object side surface of the first lens and the highest image height incident on the first lens has a variable stop between the position of the intersection with the optical axis of the outermost ray of the light beam that forms an image at the position.
- variable aperture is between the position on the optical axis of the object side surface of the first lens and the position of the intersection between the optical axis and the outermost ray of the light beam that forms an image at the highest image height incident on the first lens.
- the flicker can be reduced by extending the charge accumulation time of the solid-state imaging device by disposing the aperture and reducing the variable aperture. In a sufficiently bright shooting environment, it is possible to secure good optical performance by reducing the aperture in terms of optical performance.
- a mobile terminal according to a thirteenth aspect has the imaging device according to the eleventh or twelfth aspect.
- an imaging lens having a five-lens configuration which has a small size, sufficient brightness of F2 or less, and various aberrations are favorably corrected, an imaging device having the imaging lens, and a portable terminal having the imaging device Can be provided.
- FIG. 1 It is an external appearance perspective view of an imaging device provided with the imaging lens concerning this embodiment. It is a figure showing the section of the imaging device concerning this embodiment. BRIEF DESCRIPTION OF THE DRAWINGS It is an external view of the mobile telephone which is an example of the portable terminal provided with the imaging device which concerns on this embodiment, Comprising: The figure (a) which opened the folded portable telephone and was seen from the inside, and opened the folded portable telephone It is the figure (b) seen from the outside. It is a figure which shows an example of the control block of a mobile telephone. 2 is a cross-sectional view of an imaging lens of Example 1. FIG. FIG. FIG.
- FIG. 4 is an aberration diagram (spherical aberration, astigmatism, distortion, and meridional coma aberration) of the imaging lens of Example 1.
- 6 is a cross-sectional view of an imaging lens of Example 2.
- FIG. FIG. 7 is an aberration diagram (spherical aberration, astigmatism, distortion, meridional coma) of the imaging lens of Example 2.
- 6 is a cross-sectional view of an imaging lens of Example 3.
- FIG. FIG. 6 is an aberration diagram (spherical aberration, astigmatism, distortion, and meridional coma) of the imaging lens of Example 3.
- 6 is a cross-sectional view of an imaging lens of Example 4.
- FIG. 10 is an aberration diagram (spherical aberration, astigmatism, distortion, meridional coma) of the imaging lens of Example 4.
- FIG. 1 is an external perspective view of an imaging apparatus 50 including an imaging lens according to the present embodiment.
- the imaging device 50 includes a printed circuit board 11 on which a solid-state imaging device is mounted, cover members 12a and 12b, and a variable aperture device 13. Further, a connecting portion for connecting the imaging device 50 to another substrate of the mobile terminal is formed on the back side of the printed circuit board 11.
- FIG. 2 is a diagram illustrating a cross section of the imaging apparatus 50 according to the present embodiment. This figure shows a cross section of the imaging device 50 taken along the line FF shown in FIG.
- O is the optical axis
- S is an aperture stop that regulates the aperture
- L1 is the first lens
- L2 is the second lens
- L3 is the third lens
- L4 is the fourth lens
- L5 is the fifth lens.
- the first lens L1 has a positive refractive power and has a convex surface facing the object side.
- the second lens L2 has a meniscus shape having a negative refractive power and a convex surface facing the object side.
- the fourth lens L4 has a positive refractive power and has a convex surface facing the image side.
- the fifth lens L5 has negative refractive power and has a concave surface facing the image side.
- F is a parallel plate such as an optical low-pass filter or IR cut filter
- 8 is a solid-state imaging device, which is mounted on the printed circuit board 11.
- I is the imaging surface of the solid-state imaging device 8.
- Reference numeral 22 denotes a first guide shaft
- reference numeral 23 denotes a piezoelectric element
- reference numeral 24 denotes a second guide shaft, which are fixed to the end face of the piezoelectric element 23.
- the first guide shaft 22 and the second guide shaft 24 are disposed substantially parallel to the optical axis O.
- the aperture stop S is disposed on the image side from the position on the optical axis O of the object side surface of the first lens L1 shown in FIG. A and on the object side from the most peripheral part of the object side surface of the first lens L1. Also, the position on the optical axis of the object side surface of the first lens shown in FIG. A and the optical axis of the outermost ray of the light beam that forms an image at the highest image height incident on the first lens shown in FIG. A variable aperture K driven by the variable aperture device 13 is disposed between the intersections.
- the first lens L1, the second lens L2, and the fifth lens L5 are fixed to the imaging surface I, and the third lens L3 and the fourth lens L4 are held by the movable lens frame 25.
- the movable lens frame 25 is integrally formed with a slider portion 25s configured to generate a constant frictional force on the contact surface between the guide tube portion 25t and the second guide shaft 24 fitted to the first guide shaft 22. Has been.
- the piezoelectric element 23 is composed of laminated piezoelectric ceramics or the like, and functions as an electric actuator that expands and contracts in the direction of the optical axis O when a voltage is applied.
- the second guide shaft 24 is accompanied by the expansion and contraction of the piezoelectric element 23. Is excited in the direction of the optical axis O. By this vibration, the slider portion 25 s is moved along the second guide shaft 24 in the object direction and the solid-state imaging device 8 direction.
- the third lens L3 and the fourth lens L4 are movable in the direction of the optical axis O while being guided by the first guide shaft 22, and can perform focus adjustment corresponding to the subject distance.
- the imaging device 50 is described as having the variable aperture device 13, but the variable aperture device 13 may be omitted. Further, by configuring the third lens L3 and the fourth lens L4 to move, it is possible to perform focus adjustment corresponding to the subject distance without changing the overall length of the imaging lens. Focus adjustment corresponding to the distance may be performed. Further, although the piezoelectric element 23 is used as the focus adjustment actuator, the present invention is not limited to this, and a voice coil motor, a shape memory alloy, or the like may be used as the actuator.
- a fixed diaphragm for cutting unnecessary light between the lenses L1 to L5 and between the fifth lens L5 and the parallel plate F.
- FIG. 3 is an external view of a mobile phone 100 that is an example of a mobile terminal including the imaging device 50 according to the present embodiment.
- FIG. 3A is a view of the folded mobile phone opened and viewed from the inside, and FIG. It is the figure (b) which opened the mobile phone and was seen from the outside.
- an upper casing 71 as a case having display screens D1 and D2 and a lower casing 72 having an operation button 60 as an input unit are connected via a hinge 73.
- the imaging device 50 is built below the display screen D ⁇ b> 2 in the upper casing 71, and is arranged so that the imaging device 50 can capture light from the outer surface side of the upper casing 71.
- this imaging device may be arranged above or on the side of the display screen D2 in the upper casing 71.
- the mobile phone is not limited to a folding type.
- FIG. 4 is a diagram illustrating an example of a control block of the mobile phone 100.
- the imaging device 50 is connected to the control unit 101 of the mobile phone 100 via a printed board 11 (not shown), and outputs image signals such as luminance signals and color difference signals to the control unit 101.
- the mobile phone 100 controls each part in an integrated manner, and also executes a control part (CPU) 101 that executes a program corresponding to each process, an operation button 60 that is an input part for inputting a number and the like, Display screens D1 and D2 for displaying predetermined data and captured images, a wireless communication unit 80 for realizing various information communications with an external server, a system program for mobile phone 100, various processing programs, and a terminal
- a storage unit (ROM) 91 that stores necessary data such as an ID, and various processing programs and data executed by the control unit 101 or processing data, image data from the imaging device 50, and the like are temporarily stored.
- a temporary storage unit (RAM) 92 used as a work area.
- the image signal input from the imaging device 50 is stored in the nonvolatile storage unit (flash memory) 93 by the control unit 101 of the mobile phone 100, or displayed on the display screens D1 and D2, and further, The image information is transmitted to the outside via the wireless communication unit 80.
- the mobile phone 100 includes a microphone and a speaker for inputting and outputting audio.
- f Focal length of the entire imaging lens system
- fB Back focus
- F F number 2Y: Diagonal length ENTP on the imaging surface of the solid-state imaging device: Entrance pupil position (distance from the first surface to the entrance pupil position)
- EXTP exit pupil position (distance from imaging surface to exit pupil position)
- H1 Front principal point position (distance from the first surface to the front principal point position)
- H2 Rear principal point position (distance from the final surface to the rear principal point position)
- R radius of curvature
- D axial distance
- Nd refractive index of lens material with respect to d-line
- ⁇ d Abbe number of lens material
- the surface where “*” is written after each surface number is an aspheric surface
- the aspherical surface is a surface having a shape, and is expressed by the following “Equation 1” where the vertex of the surface is the origin, the X axis is taken in the optical axis direction, and the
- a power of 10 (for example, 2.5 ⁇ 10 ⁇ 2 ) is expressed using E (for example, 2.5E-02).
- FIG. 5 is a cross-sectional view of the imaging lens of Example 1.
- L1 is a first lens
- L2 is a second lens
- L3 is a third lens
- L4 is a fourth lens
- L5 is a fifth lens
- S is an aperture stop
- I is an imaging surface.
- F is a parallel plate that assumes an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, and the like.
- FIG. 6 is an aberration diagram (spherical aberration, astigmatism, distortion, meridional coma) of the imaging lens of Example 1.
- all the lenses are made of a plastic material
- the first lens, the second lens, and the fifth lens are fixed to the imaging surface
- the third lens and the fourth lens are integrated with each other in the optical axis direction. Focusing is performed by moving to.
- Lens Start surface Focal length (mm) 1 2 4.670 2 4-7.054 3 6 18.255 4 8 4.071 5 10 -3.656
- the variable interval A and variable interval B in the surface data of the imaging lens of Example 2 are: Object distance Variable interval A Variable interval B Infinite 0.864 0.426 100mm 0.708 0.582 It is.
- FIG. 7 is a sectional view of the lens of Example 2.
- L1 is a first lens
- L2 is a second lens
- L3 is a third lens
- L4 is a fourth lens
- L5 is a fifth lens
- S is an aperture stop
- I is an imaging surface.
- F is a parallel plate that assumes an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, and the like.
- FIG. 8 is an aberration diagram (spherical aberration, astigmatism, distortion, meridional coma) of the imaging lens of Example 2.
- all the lenses are made of a plastic material
- the first lens, the second lens, and the fifth lens are fixed to the imaging surface
- the third lens and the fourth lens are integrated with each other in the optical axis direction. Focusing is performed by moving to.
- FIG. 9 is a sectional view of the lens of Example 3.
- L1 is a first lens
- L2 is a second lens
- L3 is a third lens
- L4 is a fourth lens
- L5 is a fifth lens
- S is an aperture stop
- I is an imaging surface.
- F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like.
- FIG. 10 is an aberration diagram (spherical aberration, astigmatism, distortion, and meridional coma) of the imaging lens of Example 3.
- all the lenses are made of a plastic material, and focusing is performed by moving all the lenses from the first lens to the fifth lens integrally in the optical axis direction.
- variable interval A and variable interval B in the surface data of the imaging lens of Example 4 are Object distance Variable interval A Variable interval B Infinite 0.905 0.403 100mm 0.721 0.586 It is.
- FIG. 11 is a sectional view of the lens of Example 4.
- L1 is a first lens
- L2 is a second lens
- L3 is a third lens
- L4 is a fourth lens
- L5 is a fifth lens
- S is an aperture stop
- I is an imaging surface.
- F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like.
- FIG. 12 is an aberration diagram (spherical aberration, astigmatism, distortion, and meridional coma) of the imaging lens of Example 4.
- all the lenses are made of a plastic material
- the first lens, the second lens, and the fifth lens are fixed to the imaging surface
- the third lens and the fourth lens are integrated with each other in the optical axis direction. Focusing is performed by moving to.
- the plastic material has a large refractive index change when the temperature changes, if all of the first lens L1 to the fifth lens L5 are made of plastic lenses, the image point of the entire imaging lens system when the ambient temperature changes. The problem is that the position will fluctuate.
- inorganic fine particles can be mixed in a plastic material to reduce the temperature change of the plastic material. More specifically, when fine particles are mixed with a transparent plastic material, light scattering occurs and the transmittance is lowered. Therefore, it has been difficult to use as an optical material. By making it smaller than the wavelength, it is possible to substantially prevent scattering.
- the refractive index of the plastic material decreases with increasing temperature, but the refractive index of inorganic particles increases with increasing temperature. Therefore, it is possible to make almost no change in the refractive index by using these temperature dependencies so as to cancel each other.
- a plastic material with extremely low temperature dependency of the refractive index is obtained.
- a plastic material with extremely low temperature dependency of the refractive index is obtained.
- the refractive index change due to temperature change can be reduced.
- the temperature change of the entire imaging lens system is achieved. It is possible to suppress the image point position fluctuation at the time.
- an energy curable resin as the material of the imaging lens, since the optical performance degradation when exposed to high temperatures is small compared to a lens using a thermoplastic resin such as polycarbonate or polyolefin, It is effective for the reflow process, is easier to manufacture than a glass mold lens, is inexpensive, and can achieve both low cost and mass productivity of an imaging apparatus incorporating an imaging lens.
- the energy curable resin refers to both a thermosetting resin and an ultraviolet curable resin.
- the plastic lens of the present invention may be formed using the aforementioned energy curable resin.
- the principal ray incident angle of the light beam incident on the imaging surface of the solid-state imaging device is not necessarily designed to be sufficiently small in the periphery of the imaging surface.
- recent techniques have made it possible to reduce shading by reviewing the arrangement of the color filters of the solid-state imaging device and the on-chip microlens array. Specifically, if the pitch of the arrangement of the color filters and the on-chip microlens array is set slightly smaller than the pixel pitch of the image pickup surface of the image pickup device, the color filter or Since the on-chip microlens array is shifted to the optical axis side of the imaging lens, the obliquely incident light beam can be efficiently guided to the light receiving portion of each pixel. Thereby, the shading which generate
- the present embodiment is a design example aiming at further miniaturization with respect to the portion where the requirement is relaxed.
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Abstract
Description
L/2Y<1.1 (6)
ただし、
L :撮像レンズ全系の最も物体側のレンズ面から像側焦点までの光軸上の距離
2Y:固体撮像素子の撮像面対角線長(固体撮像素子の矩形有効画素領域の対角線長)
ここで、像側焦点とは撮像レンズに光軸と平行な平行光線が入射した場合の像点をいう。
1.5<f12/f<3.0 (1)
ただし、
f12:第1レンズと第2レンズの合成焦点距離
f:撮像レンズ全系の焦点距離
1.7<f12/f<2.8 (1)’
0.15<d5/f<0.35 (2)
ただし、
d5:第3レンズの光軸上の厚み
f:撮像レンズ全系の焦点距離
0.15<d5/f<0.30 (2)’
0<f/|f3|<0.35 (3)
ただし、
f:撮像レンズ全系の焦点距離
f3:第3レンズの焦点距離
0<f/|f3|<0.30 (3)’
0.50<f34/f<0.95 (4)
ただし、
f34:第3レンズと第4レンズの合成焦点距離
f:撮像レンズ全系の焦点距離
0.55<f34/f<0.90 (4)’
15<ν5<50 (5)
ただし、
ν5:第5レンズのアッベ数
15<ν2<31 (5)’
15<ν2<21 (5)”
f :撮像レンズ全系の焦点距離
fB:バックフォーカス
F :Fナンバー
2Y:固体撮像素子の撮像面対角線長
ENTP:入射瞳位置(第1面から入射瞳位置までの距離)
EXTP:射出瞳位置(撮像面から射出瞳位置までの距離)
H1:前側主点位置(第1面から前側主点位置までの距離)
H2:後側主点位置(最終面から後側主点位置までの距離)
R :曲率半径
D :軸上面間隔
Nd:レンズ材料のd線に対する屈折率
νd:レンズ材料のアッベ数
また、各実施例において、各面番号の後に「*」が記載されている面が非球面形状を有する面であり、非球面の形状は、面の頂点を原点とし、光軸方向にX軸をとり、光軸と垂直方向の高さをhとして以下の「数1」で表す。
Ai:i次の非球面係数
R :曲率半径
K :円錐定数
である。
実施例1の撮像レンズの全体緒元は、
f=4.72mm
fB=0.22mm
F=1.80
2Y=7.178mm
ENTP=0.00mm
EXTP=-3.61mm
H1=-1.10mm
H2=-4.50mm
である。
面番号 R(mm) D(mm) Nd νd 有効半径(mm)
1(絞り) ∞ -0.225 1.31
2* 3.820 0.633 1.54470 56.2 1.34
3* -11.027 0.067 1.37
4* 2.561 0.300 1.63440 24.0 1.42
5* 1.593 可変間隔A 1.58
6* 8.742 1.393 1.54470 56.2 1.93
7* 324.020 0.387 2.17
8* 6.715 1.043 1.54470 56.2 2.21
9* -2.764 可変間隔B 2.37
10* 7.565 0.641 1.58300 30.0 2.51
11* 1.489 0.800 3.46
12 ∞ 0.145 1.51630 64.1 3.76
13 ∞ 3.78
非球面係数は、
第2面
K=0.14302E+01,A4=0.13704E-01,A6=-0.42286E-02,A8=0.30120E-02,
A10=0.68704E-03,A12=-0.81483E-03,A14=0.29332E-03
第3面
K=-0.13788E+02,A4=0.31483E-01,A6=-0.55302E-02,A8=-0.68644E-05,
A10=0.38689E-02,A12=-0.26708E-02,A14=0.71321E-03
第4面
K=-0.94328E+01,A4=-0.50872E-01,A6=0.29395E-01,A8=-0.16253E-01,
A10=0.24673E-02,A12=0.87717E-03,A14=-0.43732E-03
第5面
K=-0.51931E+01,A4=-0.24719E-01,A6=0.14956E-01,A8=-0.11187E-01,
A10=0.51660E-02,A12=-0.15891E-02,A14=0.21438E-03
第6面
K=0.11228E+02,A4=-0.12102E-01,A6=-0.21307E-03,A8=0.99459E-03,
A10=-0.66507E-03,A12=0.15956E-03,A14=-0.13312E-04
第7面
K=-0.61778E+06,A4=-0.26386E-01,A6=-0.25343E-02,A8=0.21127E-03,
A10=0.16209E-03, A12=-0.55332E-04,A14=0.56030E-05
第8面
K=-0.77644E+01,A4=0.43999E-02,A6=-0.93262E-02,A8=0.13835E-02,
A10=-0.12546E-03,A12=-0.87629E-04,A14=0.15671E-04
第9面
K=-0.12272E+02,A4=-0.18292E-01,A6=0.60366E-02,A8=-0.24996E-02,
A10=0.36957E-03,A12=-0.39603E-04,A14=0.38835E-05
第10面
K=0.27440E+01,A4=-0.11002E+00,A6=0.15838E-01,A8=-0.23714E-03,
A10=-0.21175E-03,A12=0.34565E-04,A14=-0.22825E-05
第11面
K=-0.42959E+01,A4=-0.50988E-01,A6=0.12222E-01,A8=-0.19171E-02,
A10=0.17636E-03, A12=-0.84190E-05,A14=0.15188E-06
である。
レンズ 始面 焦点距離(mm)
1 2 5.288
2 4 -7.557
3 6 16.469
4 8 3.740
5 10 -3.310
実施例1の撮像レンズの面データ中の可変間隔A及び可変間隔Bは、
物体距離 可変間隔A 可変間隔B
無限 0.815 0.506
100mm 0.691 0.631
である。
実施例2の撮像レンズの全体緒元は、
f=4.71mm
fB=0.41mm
F=1.80
2Y=7.178mm
ENTP=0.00mm
EXTP=-3.22mm
H1=-1.40mm
H2=-4.30mm
である。
面番号 R(mm) D(mm) Nd νd 有効半径(mm)
1(絞り) ∞ -0.275 1.31
2* 2.756 0.695 1.54470 56.2 1.34
3* -30.119 0.076 1.37
4* 3.209 0.300 1.63200 23.4 1.44
5* 1.798 可変間隔A 1.45
6* 5.166 0.802 1.54470 56.2 1.87
7* 10.165 0.508 2.07
8* 549.798 0.990 1.54470 56.2 2.23
9* -2.225 可変間隔B 2.46
10* 3.226 0.629 1.58300 30.0 2.66
11* 1.191 0.600 3.34
12 ∞ 0.145 1.51630 64.1 3.56
13 ∞ 3.59
非球面係数は、
第2面
K=0.40284E+00,A4=0.37952E-02,A6=-0.39618E-02,A8=0.28149E-02,
A10=-0.25861E-04,A12=-0.88621E-03,A14=0.33596E-03
第3面
K=-0.50000E+02,A4=0.16842E-01,A6=-0.35291E-02,A8=-0.37023E-04,
A10=0.32438E-02,A12=-0.30146E-02,A14=0.91417E-03
第4面
K=-0.31672E+01,A4=-0.56590E-01,A6=0.34928E-01,A8=-0.12540E-01,
A10=0.10867E-02, A12=0.35864E-03,A14=0.34402E-04
第5面
K=-0.45678E+01,A4=-0.73141E-02,A6=0.18577E-01,A8=-0.10397E-01,
A10=0.47195E-02, A12=-0.16165E-02,A14=0.30992E-03
第6面
K=0.19372E+01,A4=-0.14784E-01,A6=-0.28229E-02,A8=0.17643E-02,
A10=-0.71958E-03, A12=0.14129E-03,A14=-0.14664E-04
第7面
K=-0.50000E+02,A4=-0.27988E-02,A6=-0.45948E-02,A8=-0.56979E-03,
A10=0.17000E-03,A12=-0.37084E-04,A14=0.41323E-05
第8面
K=-0.49386E+33,A4=0.18639E-01,A6=-0.89663E-02,A8=0.17363E-02,
A10=-0.89531E-04, A12=-0.96168E-04,A14=0.13137E-04
第9面
K=-0.84988E+01,A4=-0.30876E-01,A6=0.10197E-01,A8=-0.17973E-02,
A10=0.33915E-03,A12=-0.53647E-04,A14=0.30241E-05
第10面
K=-0.17873E+00,A4=-0.12155E+00,A6=0.17609E-01,A8=-0.16290E-03,
A10=-0.23183E-03,A12=0.25129E-04,A14=-0.96725E-06
第11面
K=-0.38095E+01,A4=-0.45467E-01,A6=0.88377E-02,A8=-0.11539E-02,
A10=0.86568E-04,A12=-0.33484E-05,A14=0.49616E-07
である。
レンズ 始面 焦点距離(mm)
1 2 4.670
2 4 -7.054
3 6 18.255
4 8 4.071
5 10 -3.656
実施例2の撮像レンズの面データ中の可変間隔A及び可変間隔Bは、
物体距離 可変間隔A 可変間隔B
無限 0.864 0.426
100mm 0.708 0.582
である。
実施例3の撮像レンズの全体緒元は、
f=4.66mm
fB=0.56mm
F=2.00
2Y=7.195mm
ENTP=0.00mm
EXTP=-4.01mm
H1=-0.09mm
H2=-4.10mm
である。
面番号 R(mm) D(mm) Nd νd 有効半径(mm)
1(絞り) ∞ -0.075 1.16
2* 3.802 0.728 1.54470 56.2 1.19
3* -8.774 0.053 1.34
4* 2.762 0.300 1.63200 23.4 1.48
5* 1.728 0.864 1.54
6* 8.217 0.972 1.54470 56.2 2.03
7* 7.797 0.365 2.15
8* -360.135 0.986 1.54470 56.2 2.18
9* -1.383 0.170 2.36
10* 4.109 0.664 1.58300 30.0 2.78
11* 1.080 0.900 3.43
12 ∞ 0.145 1.51630 64.1 3.67
13 ∞ 3.70
非球面係数は、
第2面
K=-0.14149E+01,A4=-0.16780E-02,A6=-0.77137E-02,A8=0.33364E-04,
A10=-0.57218E-04,A12=-0.43315E-03,A14=-0.20648E-04
第3面
K=0.28905E+02,A4=0.58840E-02,A6=-0.11764E-01,A8=0.56977E-03,
A10=0.16066E-02,A12=-0.15313E-02,A14=0.39621E-03
第4面
K=-0.33423E+01,A4=-0.44461E-01,A6=0.19791E-01,A8=-0.84606E-02,
A10=0.93676E-03,A12=0.37161E-03,A14=-0.36208E-04
第5面
K=-0.40345E+01,A4=-0.58718E-03,A6=0.10481E-01,A8=-0.70973E-02,
A10=0.23289E-02,A12=-0.44264E-03,A14=0.53381E-04
第6面
K=-0.14092E+02,A4=-0.15572E-01,A6=0.77596E-03,A8=0.12054E-02,
A10=-0.34397E-03, A12=0.57233E-04,A14=-0.38234E-05
第7面
K=-0.49640E+02,A4=-0.11488E-01,A6=-0.34732E-02,A8=-0.57457E-03,
A10=0.55627E-04,A12=-0.98692E-05,A14=0.48566E-05
第8面
K=-0.18698E+40,A4=0.13715E-01,A6=-0.78470E-02,A8=0.92167E-03,
A10=-0.12698E-03,A12=-0.51355E-04,A14=0.95621E-05
第9面
K=-0.46615E+01,A4=-0.22055E-01,A6=0.63991E-02,A8=-0.10531E-02,
A10=0.14246E-03,A12=-0.20723E-04,A14=0.20035E-05
第10面
K=0.84591E+00,A4=-0.71240E-01,A6=0.78213E-02,A8=-0.91251E-04,
A10=-0.86632E-04,A12=0.11456E-04,A14=-0.56108E-06
第11面
K=-0.42097E+01,A4=-0.31106E-01,A6=0.56680E-02,A8=-0.69799E-03,
A10=0.47251E-04, A12=-0.14953E-05,A14=0.13416E-07
である。
レンズ 始面 焦点距離(mm)
1 2 4.971
2 4 -8.224
3 6 -1525.592
4 8 2.547
5 10 -2.733
図9は、実施例3のレンズの断面図である。図中L1は第1レンズ、L2は第2レンズ、L3は第3レンズ、L4は第4レンズ、L5は第5レンズ、Sは開口絞り、Iは撮像面を示す。また、Fは光学的ローパスフィルタやIRカットフィルタ、固体撮像素子のシールガラス等を想定した平行平板である。図10は、実施例3の撮像レンズの収差図(球面収差、非点収差、歪曲収差、メリディオナルコマ収差)である。
実施例4の撮像レンズの全体緒元は、
f=4.71mm
fB=0.32mm
F=1.80
2Y=7.178mm
ENTP=0.00mm
EXTP=-3.54mm
H1=-1.03mm
H2=-4.38mm
である。
面番号 R(mm) D(mm) Nd νd 有効半径(mm)
1(絞り) ∞ -0.297 1.31
2* 2.688 0.763 1.54470 56.2 1.37
3* -19.848 0.050 1.39
4* 3.362 0.300 1.63200 23.4 1.43
5* 1.794 可変間隔A 1.45
6* 5.669 0.877 1.54470 56.2 1.91
7* 7.148 0.337 2.13
8* -88.212 0.952 1.54470 56.2 2.22
9* -2.289 可変間隔B 2.44
10* 2.306 0.648 1.58300 30.0 2.71
11* 1.137 0.800 3.36
12 ∞ 0.145 1.51630 64.1 3.62
13 ∞ 3.64
非球面係数は、
第2面
K=0.39391E+00,A4=0.38550E-02,A6=-0.34677E-02,A8=0.30238E-02,
A10=0.61290E-04,A12=-0.90273E-03,A14=0.30466E-03
第3面
K=-0.50000E+02,A4=0.20068E-01,A6=-0.17289E-02,A8=-0.12697E-02,
A10=0.30437E-02,A12=-0.30632E-02,A14=0.97977E-03
第4面
K=-0.34830E+01,A4=-0.56805E-01,A6=0.35617E-01,A8=-0.12242E-01,
A10=-0.15176E-03,A12=0.13735E-03,A14=0.26412E-03
第5面
K=-0.49200E+01,A4=-0.24777E-02,A6=0.16680E-01,A8=-0.10566E-01,
A10=0.50665E-02,A12=-0.19379E-02,A14=0.41049E-03
第6面
K=0.62154E+00,A4=-0.18720E-01,A6=-0.45684E-03,A8=0.18002E-02,
A10=-0.75058E-03,A12=0.11751E-03,A14=-0.78812E-05
第7面
K=-0.33946E+02,A4=-0.22021E-02,A6=-0.41599E-02,A8=-0.68904E-03,
A10=0.93542E-04,A12=-0.25093E-04,A14=0.45733E-05
第8面
K=-0.49330E+33,A4=0.21214E-01,A6=-0.77692E-02,A8=0.10254E-02,
A10=-0.60308E-04,A12=-0.82405E-04,A14=0.11777E-04
第9面
K=-0.61638E+01,A4=-0.31905E-01,A6=0.12209E-01,A8=-0.21631E-02,
A10=0.30643E-03, A12=-0.39915E-04,A14=0.22289E-05
第10面
K=-0.74551E+00,A4=-0.12887E+00,A6=0.17473E-01,A8=-0.13961E-03,
A10=-0.24006E-03,A12=0.28785E-04,A14=-0.11845E-05
第11面
K=-0.30746E+01,A4=-0.50278E-01,A6=0.96386E-02,A8=-0.12303E-02,
A10=0.87566E-04,A12=-0.29159E-05,A14=0.26517E-07
である。
レンズ 始面 焦点距離(mm)
1 2 4.399
2 4 -6.577
3 6 41.607
4 8 4.297
5 10 -4.836
実施例4の撮像レンズの面データ中の可変間隔A及び可変間隔Bは、
物体距離 可変間隔A 可変間隔B
無限 0.905 0.403
100mm 0.721 0.586
である。
上記の実施例1~4の各条件式に対応する値は、
条件式 実施例1 実施例2 実施例3 実施例4
(1):f12/f 2.65 2.10 2.09 1.99
(2):d5/f 0.30 0.17 0.21 0.19
(3):f/|f3| 0.286 0.258 0.003 0.113
(4):f34/f 0.71 0.78 0.57 0.89
(5):ν5 30.0 30.0 30.0 30.0
(6):L/2Y 1.18 1.10 1.14 1.11
である。
L2 第2レンズ
L3 第3レンズ
L4 第4レンズ
L5 第5レンズ
8 固体撮像素子
11 プリント基板
12a、12b カバー部材
13 可変絞り装置
22 第1ガイド軸
23 圧電素子
24 第2ガイド軸
25 移動鏡枠
50 撮像装置
100 携帯電話機
F 平行平板
I 撮像面
K 可変絞り
S 開口絞り
Claims (13)
- 固体撮像素子の光電変換部に被写体像を結像させるための撮像レンズであって、
物体側より順に、
正の屈折力を有し物体側に凸面を向けた第1レンズ、
負の屈折力を有し物体側に凸面を向けたメニスカス形状の第2レンズ、
正または負の屈折力を有する第3レンズ、
正の屈折力を有し像側に凸面を向けた第4レンズ、
負の屈折力を有し像側に凹面を向けた第5レンズ、からなり、
第5レンズの像側面は非球面形状であり、光軸との交点以外の位置に変曲点を有し、以下の条件式を満足することを特徴とする撮像レンズ。
1.5<f12/f<3.0 (1)
ただし、
f12:第1レンズと第2レンズの合成焦点距離
f:撮像レンズ全系の焦点距離 - 以下の条件式を満足することを特徴とする請求項1に記載の撮像レンズ。
0.15<d5/f<0.35 (2)
ただし、
d5:第3レンズの光軸上の厚み
f:撮像レンズ全系の焦点距離 - 以下の条件式を満足することを特徴とする請求項1又は2に記載の撮像レンズ。
0<f/|f3|<0.35 (3)
ただし、
f:撮像レンズ全系の焦点距離
f3:第3レンズの焦点距離 - 以下の条件式を満足することを特徴とする請求項1乃至3のいずれか一項に記載の撮像レンズ。
0.50<f34/f<0.95 (4)
ただし、
f34:第3レンズと第4レンズの合成焦点距離
f:撮像レンズ全系の焦点距離 - 前記第4レンズは両凸形状であることを特徴とする請求項1乃至4のいずれか一項に記載の撮像レンズ。
- 以下の条件式を満足することを特徴とする請求項1乃至5のいずれか一項に記載の撮像レンズ。
15<ν5<50 (5)
ただし、
ν5:第5レンズのアッベ数 - 前記第1レンズの物体側面の光軸上の位置より像側であって、前記第1レンズの物体側面の最周辺部より物体側に開口絞りを配置したことを特徴とする請求項1乃至6のいずれか一項に記載の撮像レンズ。
- 前記撮像レンズの第1レンズ、第2レンズ、第5レンズは撮像面に対して固定され、第3レンズと第4レンズを一体で光軸方向に移動させることによりフォーカシングを行うことを特徴とする請求項1乃至7のいずれか一項に記載の撮像レンズ。
- 前記撮像レンズの第3レンズ、第4レンズ、第5レンズは全て、少なくとも片側の面の光軸との交点以外の位置に変曲点を有することを特徴とする請求項1乃至8のいずれか一項に記載の撮像レンズ。
- 前記第1レンズ、第2レンズ、第3レンズ、第4レンズ、第5レンズは全て、プラスチック材料で形成されていることを特徴とする請求項1乃至9のいずれか一項に記載の撮像レンズ。
- 請求項1乃至10のいずれか一項に記載の撮像レンズと、
前記撮像レンズの像側に配置された固体撮像素子と、を有することを特徴とする撮像装置。 - 前記撮像レンズの、前記第1レンズの物体側面の光軸上の位置と前記第1レンズに入射する最も像高の高い位置に結像する光束の最外光線の光軸との交点の位置との間に、可変絞りを有することを特徴とする請求項11に記載の撮像装置。
- 請求項11又は12に記載の撮像装置を有することを特徴とする携帯端末。
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US13/880,971 US20130271642A1 (en) | 2010-10-21 | 2011-10-06 | Image pickup lens, image pickup apparatus and portable terminal |
CN201180050183.2A CN103314322B (zh) | 2010-10-21 | 2011-10-06 | 摄像透镜、摄像装置以及便携式终端 |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012177852A (ja) * | 2011-02-28 | 2012-09-13 | Kantatsu Co Ltd | 撮像レンズ |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2012177852A (ja) * | 2011-02-28 | 2012-09-13 | Kantatsu Co Ltd | 撮像レンズ |
CN103837962A (zh) * | 2012-11-26 | 2014-06-04 | 鸿富锦精密工业(深圳)有限公司 | 广角成像镜头 |
JP2014153575A (ja) * | 2013-02-08 | 2014-08-25 | Konica Minolta Inc | 撮像レンズ、撮像装置及び携帯端末 |
JP2014153576A (ja) * | 2013-02-08 | 2014-08-25 | Konica Minolta Inc | 撮像レンズ、撮像装置及び携帯端末 |
US10185122B2 (en) | 2014-07-04 | 2019-01-22 | Kantatsu Co., Ltd. | Imaging lens |
Also Published As
Publication number | Publication date |
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JPWO2012053367A1 (ja) | 2014-02-24 |
CN103314322A (zh) | 2013-09-18 |
US20130271642A1 (en) | 2013-10-17 |
CN103314322B (zh) | 2015-09-16 |
JP5740799B2 (ja) | 2015-07-01 |
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