WO2005026804A1 - 撮影レンズおよび当該撮影レンズを用いた撮像装置 - Google Patents
撮影レンズおよび当該撮影レンズを用いた撮像装置 Download PDFInfo
- Publication number
- WO2005026804A1 WO2005026804A1 PCT/JP2004/012991 JP2004012991W WO2005026804A1 WO 2005026804 A1 WO2005026804 A1 WO 2005026804A1 JP 2004012991 W JP2004012991 W JP 2004012991W WO 2005026804 A1 WO2005026804 A1 WO 2005026804A1
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- Prior art keywords
- lens
- imaging
- lenses
- object side
- positive
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Classifications
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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
- G02B13/003—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 two lenses
Definitions
- the present invention mainly relates to a CCD (Charge Coupled Device) and a CMOS.
- the present invention relates to a photographic lens applied to a portable telephone equipped with a solid-state imaging device of the (Complementary Metal Oxide Semiconductor) type and a camera for a mopile, and an imaging device using the photographic lens.
- a solid-state imaging device of the (Complementary Metal Oxide Semiconductor) type and a camera for a mopile
- an imaging device using the photographic lens and an imaging device using the photographic lens.
- a camera equipped with a solid-state imaging device such as a CCD has a space for placing an optical member such as a low-pass filter or a cover glass between the imaging lens (or the imaging lens) and the imaging device.
- an optical member such as a low-pass filter or a cover glass
- a certain back focus the distance between the final lens surface and the imaging surface
- a camera incorporated in a mobile phone or the like needs to be designed to have a very short optical length of a taking lens and to be compact. Further, with the increase in the number of pixels of the solid-state imaging device, a higher resolution of the photographing lens is required.
- Patent Document 1 discloses this kind of taking lens!
- Patent Document 1 JP 2003-75719 A
- the photographic lens disclosed in Patent Document 1 has the following problems.
- the photographing lens of Patent Document 1 has an aspherical biconvex positive lens and a positive meniscus lens having a convex surface facing the image surface side and having both aspheric surfaces in order of object side force.
- the optical length of the lens (the surface power of the aperture and the distance to the image plane) is too long, and it may not be suitable for being built into small products such as mobile phones.
- the lens optical length of the taking lens is long, it is difficult to reduce the size of the taking lens to correspond to the size of a mobile phone or the like. There was a case.
- the present invention has been made in view of the above circumstances, and has as its object to provide a small and high-performance photographic lens. Further, another object of the present invention is to provide a small-sized imaging device having such an imaging lens.
- the taking lens according to the present invention is composed of two positive meniscus lenses with the convex surface facing the object side, and satisfies the following conditional expressions (1) and (2).
- ⁇ 1 is the refractive power of the positive meniscus lens of the object Tsukuda j among the two positive meniscus lenses
- ⁇ is the combined refractive power of the entire lens system
- T is the positive lens of the two positive meniscus lenses on the object side.
- f is the focal length of the entire lens system.
- an imaging device includes the imaging lens, and an imaging device that captures an image formed by the imaging lens.
- a sector capable of controlling the amount of light incident on the imaging lens is disposed on the object side of the positive meniscus lens on the object side of the two positive meniscus lenses of the imaging lens.
- the invention's effect it is possible to provide a photographic lens having a short optical length and high-performance imaging performance, and a small-sized and high-cost imaging apparatus using the photographic lens. can do.
- FIG. 1 shows the configuration of a photographic lens according to an embodiment of the present invention and an imaging device including the photographic lens, and illustrates the photographic lens of Example 1 and an imaging device including the photographic lens.
- FIG. 3 is a diagram illustrating a configuration.
- FIG. 2 is a diagram illustrating a configuration of a photographic lens of Example 2 and an imaging apparatus including the photographic lens.
- FIG. 3 is a diagram showing a configuration of a photographic lens of Example 3 and an imaging device including the photographic lens.
- FIG. 4 is a view showing lens data of Example 1.
- FIG. 5 is a diagram showing spherical aberration according to Example 1.
- FIG. 6 is a diagram showing astigmatism according to Example 1.
- FIG. 7 is a diagram showing distortion according to Example 1.
- FIG. 8 is a view showing lens data of Example 2.
- FIG. 9 is a diagram showing spherical aberration according to a second embodiment.
- FIG. 10 is a diagram illustrating astigmatism according to a second embodiment.
- FIG. 11 is a diagram showing distortion according to a second embodiment.
- FIG. 12 is a diagram showing lens data of Example 3.
- FIG. 13 is a diagram showing spherical aberration according to a third embodiment.
- FIG. 14 is a diagram illustrating astigmatism according to a third embodiment.
- FIG. 15 is a diagram showing distortion according to a third embodiment.
- FIG. 16 is a diagram comparing lens performances of the taking lens of each embodiment according to the present invention and the taking lens of each embodiment of Patent Document 1.
- the taking lens 1 when taking the left side of the figure as the object side, has a stop S and a convex surface on the object side along the optical axis O in order from the object side.
- the lens surfaces of the first and second lenses Ll and L2 are all aspheric.
- the photographing lens 1 of the present embodiment is a two-element lens.
- the imaging device 20 includes an imaging lens 1, a parallel plate glass (optical filter) 10, an imaging device (solid-state imaging device) 11, and a shutter 12.
- rl is the radius of curvature of the first lens L1 on the object side near the optical axis O
- r2 is the radius of curvature of the first lens L1 near the image side of the image
- r3 is the radius of curvature of the first lens L1.
- the radius of curvature near the optical axis O of the object-side surface of the second lens L2 and r4 is the radius of curvature near the optical axis O of the image-side surface of the second lens L2.
- dl is the core thickness of the first lens L1 on the optical axis O
- d2 is the distance between the first lens L1 and the second lens L2 on the optical axis O
- d3 is the core thickness of the second lens L2 on the optical axis O
- d4 Denotes the distance between the second lens L2 and the plane-parallel glass 10
- d5 denotes the thickness of the plane-parallel glass
- d6 denotes the distance between the plane-parallel glass 10 and the image plane M. Note that these distances are lengths along the optical axis O.
- T indicates the distance on the optical axis from the object-side surface of the first lens L1 to the imaging plane M.
- the parallel plane glass 10 disposed between the second lens L2 and the image-forming surface M on the image side of the image sensor 11 is preferably a low-pass filter or IR (infrared) cut required for the solid-state image sensor 11.
- An optical filter such as a filter.
- a plane plate of a cover glass (not shown) is arranged between the parallel plane glass 10 and the image plane M. The cover glass is used to protect the surface of the solid-state imaging device 11.
- the solid-state imaging device 11 captures a subject image formed by the imaging lens 1 and converts the image into an electric signal.
- the solid-state imaging device 11 for example, a CCD, a CMOS, or the like is used.
- the solid-state imaging device 11 is electrically connected to and held by a substrate (not shown).
- the shirt 12 has a shirt board 122 having an opening 121 and a sector 123 which can be moved back and forth so as to open and close the opening 121 by an actuator (not shown).
- the shirt 12 is arranged on the object side of the first lens L1 (the object side of the stop S). With the configuration in which the shirt 12 is arranged on the object side of the first lens L1 in this way, the entire imaging lens 1 system and the mechanism of the shirt 12 can be configured separately, so that the imaging device 20 can be easily assembled. At the same time, the imaging device 20 can be made smaller.
- the stop S is arranged on the object side of the first lens L1 to facilitate the standing.
- () 1 is the refracting power of the first lens 1 and ⁇ is the combined refractive power of the entire lens system
- T is the distance on the optical axis O from the object-side surface of the first lens L1 to the imaging plane M
- f indicates the focal length of the entire lens system.
- Conditional expression (1) defines the ratio of the refractive power ⁇ 1 of the first lens L1 to the combined refractive power ⁇ of the entire lens system as 0.
- the ratio is smaller than 0.5, the refractive power ⁇ 1 of the first lens L1 becomes weak, so that the optical length of the lens becomes too large, and the entire imaging device 20 becomes large. It is difficult to apply to small or thin cameras.
- the ratio is greater than 1, the refractive power ⁇ 1 of the first lens L1 increases, so that the curvature of the first lens L1 decreases and the error sensitivity increases. Production becomes difficult.
- the refractive power ⁇ 1 of the first lens L1 it is necessary to combine the refractive power ⁇ 1 of the first lens L1 with the entire lens system. It is preferable to set the ratio to the refractive power ⁇ in the range of 0.7 to 1 (0.7 ⁇ ⁇ 1 ⁇ ⁇ ⁇ 1) because the size becomes smaller.
- Conditional expression (2) indicates that the ratio of the surface force on the object side of the first lens L1 to the image plane ⁇ and the focal length f of the entire lens system is 0.8 to 1.8. Within the range. If the ratio is less than 0.8, the refractive power ⁇ 1 of the first lens L1 becomes too weak, and it becomes difficult to correct aberration. On the other hand, when the ratio is 1.8 or more, the overall length of the imaging lens 1 becomes long, which is not suitable for miniaturization. As described above, the distance T from the object-side surface of the first lens L1 to the imaging plane M is set to be 0.8 to 1.8 times the focal length f of the entire lens system, so that the size and the size are small.
- the taking lens 1 it is preferable to obtain a high-performance photographic lens corresponding to the increase in the number of pixels of the image sensor 11.
- the distance T from the surface power on the object side of the first lens L1 to the imaging plane M and the focal length of the entire lens system
- the ratio with f is in the range of 1 to 1.3 (l ⁇ TZf ⁇ l. 3)
- the size and thickness are further reduced, which is preferable.
- the aspherical shape of the second lens L2 changes from convex to concave from the optical axis O toward the periphery. Therefore, the field curvature can be corrected with high performance.
- an imaging lens 1 having a short optical length and high-performance imaging performance it is possible to obtain an imaging lens 1 having a short optical length and high-performance imaging performance, and a configuration having only two lenses. Therefore, it is possible to provide the imaging device 20 that is extremely small and has high cost performance.
- f is the focal length of the entire lens system
- ⁇ is the half angle of view
- d is the thickness of the lens, etc. or the air gap between the lenses, etc.
- nd is the d of each lens, etc.
- vd is the Abbe number of each lens.
- each surface of the lens (rl, r2, r3, r4) is composed of an aspherical surface, takes the Z axis in the direction of the optical axis O, the X axis in the direction perpendicular to the optical axis, and assumes that the traveling direction of light is positive,
- the conic constant is k
- the aspheric coefficients are a, b, c, and d
- the shape of the aspheric surface is expressed by equation (3).
- the photographing lens according to the first embodiment has a cross-sectional configuration shown in FIG.
- the lens data of the taking lenses L1 and L2 are as shown in FIG. 4, and the surface numbers in (a) are sequentially assigned to the object-side surfaces along the optical axis O.
- the surface number O (STO) corresponds to the aperture S.
- Surface numbers 1 and 2 correspond to rl and r2 of the first lens L1, and surface numbers 3 and 4 correspond to r3 and r4 of the second lens L2.
- the surface number 5 corresponds to the object-side surface r5 of the parallel flat glass 10
- the surface number 6 corresponds to the image-side surface r6 of the parallel flat glass 10.
- the distance d indicates the distance (dl, d2, d3, d4, d5, d6) between the surfaces on the optical axis O.
- (B) represents the data of the aspherical surface.
- the numerical value in (b) indicates a power number, for example, “1.04989E-01” is “1.004289 X 10-1”.
- the thickness of glass is 0.5 mm.
- FIG. 5 to 7 show various aberrations according to Example 1, FIG. 5 shows spherical aberration, FIG. 6 shows astigmatism, and FIG. 7 shows distortion.
- the broken line is the d-line
- the solid line is the F-line
- the dashed line is the spherical aberration with respect to the C-line.
- the solid line indicates the aberration of the tangential image surface
- the broken line indicates the aberration of the sagittal image surface.
- the distortion in FIG. 7 is for the d-line.
- the symbols of aberrations used in these figures are the same in Examples 2-5 below.
- FIG. 2 shows a cross-sectional configuration of the imaging lens of the second embodiment.
- FIG. 8 shows lens data of the second embodiment.
- the surface numbers in (a) are sequentially assigned to the surfaces on the object-side force along the optical axis O.
- the surface number O (STO) corresponds to the aperture S.
- Surface numbers 1 and 2 correspond to rl and r2 of the first lens L1, and surface numbers 3 and 4 correspond to r3 and r4 of the second lens L2.
- the surface number 5 corresponds to the object-side surface r5 of the parallel flat glass 10
- the surface number 6 corresponds to the image-side surface r6 of the parallel flat glass 10.
- the distance d indicates the distance (dl, d2, d3, d4, d5, d6) between the surfaces on the optical axis O.
- (B) represents the data of the aspherical surface.
- the numerical value in (b) indicates a power number, for example, “1.04989E-01” is “1.004289 X 10-1”.
- the thickness of the cover glass is 0.5 mm.
- FIG. 9 shows the spherical aberration in Example 2
- FIG. 10 shows the astigmatism
- FIG. 11 shows the distortion.
- FIG. 3 shows a cross-sectional configuration of the imaging lens of the third embodiment.
- the lens data of the third embodiment is used. This is shown in FIG.
- the surface numbers in (a) are sequentially assigned to the surfaces from the object side along the optical axis O.
- the surface number O (STO) corresponds to the aperture S.
- Surface numbers 1 and 2 correspond to rl and r2 of the first lens L1, and surface numbers 3 and 4 correspond to r3 and r4 of the second lens L2.
- the surface number 5 corresponds to the object-side surface r5 of the parallel flat glass 10
- the surface number 6 corresponds to the image-side surface r6 of the parallel flat glass 10.
- the distance d indicates the distance (dl, d2, d3, d4, d5, d6) between the surfaces on the optical axis O.
- (B) represents the data of the aspherical surface.
- the numerical value of (b) indicates a power, for example, “1.04989E-01” is “1.004289 X 10-1”.
- the thickness of the cover glass is 0.5 mm.
- FIG. 13 shows the spherical aberration
- FIG. 14 shows the astigmatism
- FIG. 15 shows the distortion according to the third embodiment.
- FIG. 16 (a) shows the numerical values of conditional expressions (1) and (2) calculated based on the lens data of each example disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2003-75719). It is. (B) is obtained by calculating the numerical values of the conditional expressions (1) and (2) based on the lens data of Examples 1 to 3 according to the present invention.
- the imaging lenses of Examples 1 to 3 of the present invention are shorter in optical length and have higher imaging performance than that of Patent Document 1. By employing this imaging lens, it is possible to provide an extremely small and cost-effective imaging device.
- the present invention is not limited to a specific embodiment and example, and the present invention described in the claims is not limited thereto.
- the two surfaces of each of the two photographing lenses Ll and L2 have an aspherical shape.
- the present invention is not limited to this. Good.
- the example in which the parallel plate glass 10 is provided has been described, but the parallel plate glass 10 is not necessarily provided.
- the example in which the shutter 12 and the stop S are provided separately has been described, but the opening 121 of the shutter 12 may have the same diameter as the opening of the stop S, and the opening 121 may be a stop.
- the shirt substrate 122 is provided at the position where the stop S was provided.
- the shutter 12 has a small aperture opening smaller than the aperture S for controlling the amount of light incident on the taking lens. Or a small aperture function for reducing the amount of light with an ND filter or the like.
- a lens barrier may be provided instead of the shirt 12.
- the photographic lens according to the present invention and the imaging apparatus using the photographic lens can be applied to, for example, portable equipment.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003-317445 | 2003-09-09 | ||
JP2003317445 | 2003-09-09 |
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WO2005026804A1 true WO2005026804A1 (ja) | 2005-03-24 |
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PCT/JP2004/012991 WO2005026804A1 (ja) | 2003-09-09 | 2004-09-07 | 撮影レンズおよび当該撮影レンズを用いた撮像装置 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7110190B2 (en) | 2004-01-16 | 2006-09-19 | Milestone Col., Ltd. | Imaging lens |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01158409A (ja) * | 1987-09-04 | 1989-06-21 | Fuji Photo Film Co Ltd | 測距用光学系 |
JPH06230277A (ja) * | 1993-01-29 | 1994-08-19 | Mark:Kk | 読み取り用レンズ |
JP2002072079A (ja) * | 2000-06-12 | 2002-03-12 | Minolta Co Ltd | 撮像レンズ装置 |
JP2003329922A (ja) * | 2002-05-10 | 2003-11-19 | Seiko Epson Corp | 撮像レンズ |
JP2004004620A (ja) * | 2002-03-29 | 2004-01-08 | Fuji Photo Optical Co Ltd | 撮像レンズ |
JP2004109585A (ja) * | 2002-09-19 | 2004-04-08 | Minolta Co Ltd | 撮像レンズ |
JP2004145183A (ja) * | 2002-10-28 | 2004-05-20 | Konica Minolta Holdings Inc | 撮像レンズ、撮像ユニット及び携帯端末 |
JP2004191844A (ja) * | 2002-12-13 | 2004-07-08 | Minolta Co Ltd | 撮像レンズ |
JP2004246168A (ja) * | 2003-02-14 | 2004-09-02 | Fuji Photo Optical Co Ltd | 単焦点レンズ |
JP2004246169A (ja) * | 2003-02-14 | 2004-09-02 | Fuji Photo Optical Co Ltd | 単焦点レンズ |
-
2004
- 2004-09-07 WO PCT/JP2004/012991 patent/WO2005026804A1/ja not_active Application Discontinuation
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01158409A (ja) * | 1987-09-04 | 1989-06-21 | Fuji Photo Film Co Ltd | 測距用光学系 |
JPH06230277A (ja) * | 1993-01-29 | 1994-08-19 | Mark:Kk | 読み取り用レンズ |
JP2002072079A (ja) * | 2000-06-12 | 2002-03-12 | Minolta Co Ltd | 撮像レンズ装置 |
JP2004004620A (ja) * | 2002-03-29 | 2004-01-08 | Fuji Photo Optical Co Ltd | 撮像レンズ |
JP2003329922A (ja) * | 2002-05-10 | 2003-11-19 | Seiko Epson Corp | 撮像レンズ |
JP2004109585A (ja) * | 2002-09-19 | 2004-04-08 | Minolta Co Ltd | 撮像レンズ |
JP2004145183A (ja) * | 2002-10-28 | 2004-05-20 | Konica Minolta Holdings Inc | 撮像レンズ、撮像ユニット及び携帯端末 |
JP2004191844A (ja) * | 2002-12-13 | 2004-07-08 | Minolta Co Ltd | 撮像レンズ |
JP2004246168A (ja) * | 2003-02-14 | 2004-09-02 | Fuji Photo Optical Co Ltd | 単焦点レンズ |
JP2004246169A (ja) * | 2003-02-14 | 2004-09-02 | Fuji Photo Optical Co Ltd | 単焦点レンズ |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7110190B2 (en) | 2004-01-16 | 2006-09-19 | Milestone Col., Ltd. | Imaging lens |
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