WO2013027641A1 - 撮像レンズ及び撮像装置 - Google Patents
撮像レンズ及び撮像装置 Download PDFInfo
- Publication number
- WO2013027641A1 WO2013027641A1 PCT/JP2012/070773 JP2012070773W WO2013027641A1 WO 2013027641 A1 WO2013027641 A1 WO 2013027641A1 JP 2012070773 W JP2012070773 W JP 2012070773W WO 2013027641 A1 WO2013027641 A1 WO 2013027641A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lens
- imaging
- imaging lens
- conditional expression
- refractive power
- Prior art date
Links
- 230000014509 gene expression Effects 0.000 claims abstract description 79
- 238000003384 imaging method Methods 0.000 claims description 250
- 230000003287 optical effect Effects 0.000 claims description 24
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000004075 alteration Effects 0.000 description 35
- 238000012937 correction Methods 0.000 description 13
- 206010010071 Coma Diseases 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 230000005499 meniscus Effects 0.000 description 8
- 238000012545 processing Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 201000009310 astigmatism Diseases 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 210000001747 pupil Anatomy 0.000 description 4
- 238000004904 shortening Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Images
Classifications
-
- 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
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
- H01L27/144—Devices controlled by radiation
- H01L27/146—Imager structures
- H01L27/14601—Structural or functional details thereof
- H01L27/14625—Optical elements or arrangements associated with the device
Definitions
- the present invention relates to a small imaging lens for forming a subject image detected by a solid-state imaging device and an imaging apparatus including the imaging lens.
- compact imaging devices using solid-state imaging devices such as CCD (Charge-Coupled Device) type image sensors or CMOS (Complementary Metal-Oxide Semiconductor) type image sensors have become mobile terminals such as mobile phones and PDA (Personal Digital Assistant), Furthermore, it is also installed in notebook personal computers and the like, and it is possible to transmit not only audio information but also image information to a remote place.
- CCD Charge-Coupled Device
- CMOS Complementary Metal-Oxide Semiconductor
- the pixel size has been reduced, and the imaging device has been increased in size and size. Further, it is possible to curve the imaging surface, and there is a demand for a compact and high-performance imaging lens that is optimal for such an imaging device.
- Patent Document 1 discloses an imaging device in which a solid-state imaging element is curved.
- a solid-state imaging device is curved into a polynomial surface shape to correct the curvature of field and distortion generated by the lens in a well-balanced manner, thereby providing a small and high-resolution imaging apparatus.
- the solid-state image pickup device has a CIF (Common Intermediate Format) size (352 pixels ⁇ 288 pixels) and an image pickup lens, the chromatic aberration is not sufficiently corrected. Therefore, a solid-state image pickup device having a higher pixel is used. Therefore, it is not possible to obtain an imaging device having high performance.
- CIF Common Intermediate Format
- Patent Document 2 and Patent Document 3 an imaging surface having a curved imaging surface, a shooting field angle of about 77 °, and brightness of F5.7 to F6.2 for a compact camera or a lens-equipped film unit.
- a lens is disclosed.
- the lens configuration is a rear stop triplet type lens including a positive first lens, a negative second lens, a positive third lens, and an aperture stop.
- Patent Documents 2 and 3 are imaging lenses for film cameras, and the performance is improved by curving the film surface (imaging surface) in accordance with the curvature of field generated by the lens.
- the film surface is a so-called cylindrical imaging surface that is curved only in the long side direction of the screen due to the structure of the camera. Therefore, although good performance can be obtained in the long side direction of the screen, the imaging surface in the short side direction of the screen remains flat, so performance cannot be improved and deterioration may occur depending on the correction status of field curvature. obtain.
- Patent Documents 2 and 3 are imaging lenses for film cameras as described above, the principal ray incident angle of the light beam incident on the imaging surface is not necessarily designed to be sufficiently small in the periphery of the imaging surface. .
- an imaging lens for forming a subject image on the photoelectric conversion unit of a solid-state image sensor if the chief ray incident angle, so-called telecentric characteristics, of the light beam incident on the imaging surface deteriorates, the light beam is incident obliquely on the solid-state image sensor.
- a phenomenon (shading) in which the substantial aperture efficiency decreases in the periphery of the imaging surface occurs, and the peripheral light amount becomes insufficient.
- Patent Document 4 discloses an example in which a curved solid-state image sensor is combined with a lens having four lenses to improve performance.
- the most image side lens is a positive lens, the total length is large, and aberration correction is not sufficient in place of the total length, and it is not possible to cope with the recent increase in the number of pixels and the increase in aperture.
- Patent Document 5 a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a positive refractive power, and a negative lens in order from the object side.
- a so-called telephoto type that aims to reduce the overall length of the imaging lens (distance on the optical axis from the most object-side lens surface to the image-side focal point of the entire imaging lens system).
- An imaging lens is disclosed.
- the imaging lens described in Patent Document 5 has a maximum chief ray incident angle on the imaging surface of 26 ° or more, and it cannot be said that the telecentric characteristic is good, the optical total length is not sufficiently shortened, and the F value is also low. It is so dark as F3.0.
- the present invention has been made in view of the problems of the background art described above, and by utilizing the fact that the projection surface, such as the imaging surface of the solid-state imaging device, is curved, it is small and has high performance.
- An object of the present invention is to obtain an imaging lens and an imaging apparatus having a five-lens configuration that can brightly suppress shading with an F value of F2.8 or less.
- the present invention aims at downsizing at a level satisfying the following conditional expression (9). By satisfying this range, the entire imaging apparatus can be reduced in size and weight.
- L Distance on the optical axis from the lens surface closest to the object side to the image-side focal point of the entire imaging lens system 2Y: Diagonal length of the projected 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 projected surface diagonal length 2Y is not the height from the optical axis, but the length of the arc along the curved projected surface.
- conditional expression (9) ′ L / 2Y ⁇ 1.10 (9) ′ An imaging lens that falls within this range is targeted.
- an imaging lens according to the present invention is for forming a subject image on a projection surface provided in an imaging apparatus, and the projection surface is an arbitrary heading toward the periphery of the screen. It is curved so that it falls to the object side in the cross section.
- the imaging lens of the present invention includes, in order from the object side, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having positive or negative refractive power, and positive or negative. And a fifth lens having at least one aspherical surface and having a negative refractive power. Furthermore, the imaging lens of the present invention satisfies the following conditional expression (1). -2.50 ⁇ f5 / f ⁇ -0.10 (1) However, f5: focal length of the fifth lens f: focal length of the entire imaging lens system
- the imaging lens of the present invention is based on the premise that the projection surface is not curved only in the long side direction as in a conventional film camera, but curved such that it falls to the object side at an arbitrary cross section toward the periphery of the screen. It is said.
- the projection surface for imaging is curved, so that both miniaturization and high performance can be achieved.
- correction of the principal ray incident angle of the light beam incident on the projection surface that is, correction of so-called telecentric characteristics is advantageous.
- the chief ray incidence angle of the light beam incident on the projection surface is smaller when the projection surface is curved toward the imaging lens side than when the projection surface is flat, so the telecentric characteristics of the imaging lens Even if this correction is not performed sufficiently, the aperture efficiency does not decrease and the occurrence of shading can be suppressed.
- the curved shape of the projection surface is curved so that both the long side direction and the short side direction of the screen are inclined toward the object side toward the periphery of the screen.
- the curved shape of the projection surface does not necessarily have to be a spherical shape, and may be any surface shape that can be expressed by an arbitrary expression such as an aspherical shape, a parabolic shape, or an XY polynomial surface shape.
- the imaging lens of the present invention in order from the object side, the first lens having a positive refractive power, the second lens having a negative refractive power, and the third lens having a positive or negative refractive power. And a fourth lens having positive or negative refractive power, and a fifth lens having at least one aspherical surface and having negative refractive power.
- This lens configuration of a so-called telephoto type in which a positive group consisting of a first lens, a second lens, a third lens, and a fourth lens and a negative group consisting of a fifth lens are arranged reduces the overall length of the imaging lens. In other words, this configuration is advantageous for downsizing the imaging lens and the imaging apparatus.
- Conditional expression (1) is a conditional expression for appropriately setting the focal length of the fifth lens.
- the value of conditional expression (1) exceeds the lower limit, the negative focal length of the fifth lens does not become unnecessarily small, and the telecentric characteristics at the periphery of the screen can be improved.
- the value is below the upper limit, the negative focal length of the fifth lens can be appropriately reduced, which is advantageous for shortening the overall length of the imaging lens and correcting chromatic aberration.
- the value f5 / f is more preferably set in the range of the following expression. -2.40 ⁇ f5 / f ⁇ -0.30 (1) '
- the amount of curvature of the projection surface satisfies the following conditional expression (2).
- SAGI Amount of displacement of the projection surface in the optical axis direction
- Y Maximum image height
- Conditional expression (2) is a conditional expression for appropriately setting the amount of curvature of the projection surface. If the lower limit is exceeded, the amount of curvature of the projection surface or the imaging surface can be maintained moderately, and it is possible to prevent an increase in the telecentric characteristics and the field curvature correction burden on the imaging lens. Therefore, the Petzval sum does not become too small, and coma and chromatic aberration can be corrected well. On the other hand, when the value is below the upper limit, it is possible to prevent the field curvature from being excessively corrected due to an excessively large curvature amount of the projection surface or the imaging surface. In addition, it is possible to prevent the final surface of the imaging lens from being too close to the projection surface, and to secure a sufficient air space for inserting an IR (infrared) cut filter or the like.
- IR infrared
- the maximum image height Y is not the height from the optical axis, but the length of the arc along the curved projection surface or imaging surface.
- the value SAGI / Y is more preferably in the range of the following equation. 0.10 ⁇ SAGI / Y ⁇ 1.20 (2) '
- the projection surface has a spherical shape and satisfies the following conditional expression (3). -8.0 ⁇ RI / Y ⁇ -1.0 (3) However, RI: radius of curvature of projection surface Y: maximum image height
- Conditional expression (3) is a conditional expression for appropriately setting the amount of curvature of the projection surface. If the lower limit is exceeded, the amount of curvature of the projection surface can be maintained moderately, and it is possible to prevent an increase in the telecentric characteristics and the field curvature correction burden in the imaging lens. Therefore, the Petzval sum does not become too small, and coma and chromatic aberration can be corrected well.
- the maximum image height Y is not the height from the optical axis, but the arc length along the curved projection surface or imaging surface.
- the value RI / Y is more preferably set to the range of the following equation. -7.0 ⁇ RI / Y ⁇ -1.5 (3) '
- the first lens has a shape with a convex surface facing the object side, and satisfies the following conditional expression (4). 0.4 ⁇ f1 / f ⁇ 2.0 (4)
- f1 Focal length of the first lens
- f Focal length of the entire imaging lens system
- Conditional expression (4) is a conditional expression for appropriately setting the focal length of the first lens to appropriately shorten the entire imaging lens and correct aberrations.
- the value of conditional expression (4) is below the upper limit, the refractive power of the first lens can be maintained appropriately. Thereby, the synthetic principal point from the first lens to the third lens can be arranged closer to the object side, and the entire length of the imaging lens can be shortened.
- the refractive power of the first lens does not become unnecessarily large, and higher-order spherical aberration and coma aberration generated in the first lens can be suppressed to be small.
- the value f1 / f is in the range of the following expression. 0.5 ⁇ f1 / f ⁇ 1.8 (4) ′
- the second lens has a shape with a concave surface facing the image side, and satisfies the following conditional expression (5). 0.50 ⁇ (r3 + r4) / (r3-r4) ⁇ 2.00 (5)
- r3 radius of curvature of the second lens object side surface
- r4 radius of curvature of the second lens image side surface
- Conditional expression (5) is a conditional expression for appropriately setting the shaping factor of the second lens.
- the lower limit of conditional expression (5) is exceeded, the principal point position of the second lens moves to the image side, the distance between the principal points of the first lens and the second lens increases, and the first lens and the second lens.
- the refractive power of the first lens and the second lens can be reduced while maintaining the combined focal length.
- the occurrence of each aberration can be suppressed, and the influence of manufacturing errors can be reduced, so that mass productivity is improved.
- conditional expression (5) by falling below the upper limit value of conditional expression (5), it is possible to suppress the occurrence of higher-order aberrations such as coma and flare due to an increase in the curvature radius of the image side surface.
- the value (r3 + r4) / (r3-r4) is more preferably set in the range of the following equation. 0.70 ⁇ (r3 + r4) / (r3-r4) ⁇ 1.90 (5) ′
- conditional expression (6) is satisfied. 0.10 ⁇ fb / f ⁇ 0.70 (6)
- fb Back focus of the imaging lens
- f Focal length of the entire imaging lens system
- Conditional expression (6) is a conditional expression for appropriately setting the back focus of the lens system.
- the most image side lens and the imaging surface are not brought too close to each other, and a space for inserting a parallel plate can be secured.
- the back focus does not become unnecessarily large, and as a result, the entire length of the imaging lens can be reduced.
- the back focus is parallel when an optical low-pass filter, an infrared cut filter, or a parallel plate such as a seal glass of a solid-state imaging device package is disposed between the most image side lens and the imaging surface.
- the flat plate portion refers to the distance on the optical axis between the most image side lens and the imaging surface with the air conversion distance.
- the value fb / f is more preferably in the range of the following equation. 0.10 ⁇ fb / f ⁇ 0.65 (6) ′
- the image side surface of the third lens has an aspheric shape, and satisfies the following conditional expression (7). 0.20 ⁇ f /
- f Focal length of the entire imaging lens system
- f3 Focal length of the third lens
- Conditional expression (7) is a conditional expression for appropriately setting the focal length of the third lens, achieving both shortening of the entire length of the imaging lens and aberration correction, and minimizing performance degradation when a manufacturing error occurs.
- the focal length of the third lens in the range of the conditional expression (7), the refractive power of the third lens does not become too strong, the entire length of the imaging lens can be shortened, and performance degradation when a manufacturing error occurs can be reduced. Can be small. Since the image side surface of the third lens has an aspherical shape, it is possible to satisfactorily correct the aberration in the peripheral portion of the screen while suppressing the paraxial refractive power of the third lens so as not to become too strong.
- is more preferably in the range of the following equation. 0.30 ⁇ f /
- conditional expression (8) is satisfied. 0.015 ⁇ PTZ / f ⁇ 0.045 (8)
- PTZ Petzval sum of the entire imaging lens system
- f Focal length of the entire imaging lens system
- Conditional expression (8) is a conditional expression for appropriately setting the Petzval sum of the entire imaging lens system so that the curvature of field is more suitable for the curved imaging surface.
- the Petzval sum of the entire imaging lens system is given by the following equation. here, k: number of lens surfaces r j : radius of curvature of j-th surface n j : refractive index of incident side of j-th surface n ′ j : refractive index of outgoing side of j-th surface
- the Petzval sum is appropriately increased and the curvature of field is appropriately generated, thereby matching the curved image surface and obtaining good performance up to the periphery.
- the value is lower than the upper limit, it is possible to prevent the amount of field curvature generated in the lens system from being excessively increased and cannot be compensated by the curved imaging surface.
- the value PTZ / f is more preferably in the range of the following equation. 0.015 ⁇ PTZ / f ⁇ 0.040 (8) ′
- an aperture stop is disposed on the image side from the position on the optical axis of the object side surface of the first lens and closer to the object side than the most peripheral portion of the object side surface of the first lens. ing.
- an aperture stop is disposed between the first lens and the second lens.
- an aperture stop is disposed between the third lens and the fourth lens.
- the entire lens system can be easily made symmetrical with the stop interposed therebetween, and a configuration advantageous for aberration correction can be obtained. It becomes possible.
- the imaging device according to the present invention has the imaging lens described above.
- the imaging lens of the present invention it is possible to provide an imaging apparatus capable of suppressing shading with a small size and high performance.
- FIG. 3 is a cross-sectional view of the imaging lens of Example 1.
- FIG. 3A to 3E are aberration diagrams of the imaging lens of Example 1.
- FIG. 6 is a cross-sectional view of an imaging lens of Example 2.
- FIG. 5A to 5E are aberration diagrams of the imaging lens of Example 2.
- FIG. 6 is a cross-sectional view of an imaging lens of Example 3.
- FIG. 7A to 7E are aberration diagrams of the imaging lens of Example 3.
- FIG. 6 is a cross-sectional view of an imaging lens of Example 4.
- FIG. 9A to 9E are aberration diagrams of the imaging lens of Example 4.
- FIG. 1 is a cross-sectional view showing an imaging apparatus 100 according to one embodiment.
- the imaging device 100 includes an imaging unit 50 for forming an image signal, and a processing unit 60 that functions as the imaging device 100 by operating the imaging unit 50 as appropriate.
- the imaging unit 50 includes an imaging lens 10 that forms a subject image, a solid-state imaging device 51 that is a CMOS image sensor that detects a subject image formed by the imaging lens 10, and the solid-state imaging device 51 is curved.
- a supporting body 52 to be held, a substrate 53 that supports the supporting body 52 from behind and provided with wiring and the like, and a light-shielding housing 54 having an opening OP for allowing a light beam from the object side to enter. are integrally formed.
- the imaging lens 10 includes, for example, a first lens L1, an aperture stop S, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5 in order from the object side.
- the solid-state imaging device 51 includes a photoelectric conversion unit 51a as a light receiving unit, and a signal processing circuit 51b is formed around the photoelectric conversion unit 51a.
- the photoelectric conversion unit 51a has an imaging surface I that is a projection surface on which pixels (photoelectric conversion elements) are two-dimensionally arranged.
- the signal processing circuit 51b includes, for example, a drive circuit unit that sequentially drives each pixel to obtain a signal charge, an A / D conversion unit that converts each signal charge into a digital signal, and the like.
- the solid-state imaging device 51 is not limited to the above-described CMOS type image sensor, and may be one to which another device such as a CCD is applied.
- the support body 52 is formed of, for example, a hard material, and has a role of maintaining and fixing the solid-state imaging device 51 in a concave shape that is symmetrically recessed around the optical axis AX.
- the imaging surface (projection surface) I of the solid-state imaging device 51 is in a curved state (specifically, tilted toward the imaging lens 10 so as to be directed to the central optical axis AX in an arbitrary cross section including the optical axis AX). Hemispherical concave surface).
- a signal processing circuit 52 a having a function of controlling the operation of the signal processing circuit 51 b can be formed on the support body 52.
- the substrate 53 includes a main body portion 53a that supports the support body 52 and the housing 54 on one surface side, and a flexible printed circuit board 53b that has one end connected to the other surface side of the main body portion 53a.
- the main body portion 53a is connected to the solid-state imaging device 51 via the bonding wire W on the one surface side, and is connected to the flexible printed board 53b on the other surface side.
- the flexible printed circuit board 53b connects the main body portion 53a and an external circuit (not shown) (for example, a control circuit included in a host device on which the imaging unit 50 is mounted), and drives the solid-state imaging device 51 from the external circuit. It is possible to receive a voltage or a clock signal, and to output YUV or other digital pixel signals to an external circuit.
- an external circuit for example, a control circuit included in a host device on which the imaging unit 50 is mounted
- the housing 54 accommodates and holds the imaging lens 10.
- the casing 54 is provided on the surface of the substrate 53 on the solid-state image sensor 51 side so as to cover the solid-state image sensor 51. That is, the housing 54 is wide open so as to surround the solid-state imaging device 51 on the back surface side and is fixed to the support substrate 52a, and is formed in a cylindrical shape with a flange having an opening OP of a predetermined size on the front surface side. ing.
- a parallel plate F having an infrared light cutting function is fixed and disposed between the body of the imaging lens 10 and the solid-state imaging device 51. The parallel plate F is supported by the housing 54 like the imaging lens 10.
- the processing unit 60 includes a control unit 61, an input unit 62, a storage unit 63, and a display unit 64.
- the control unit 61 causes the imaging unit 50 to perform an imaging operation.
- the input unit 62 is a part that receives user operations.
- the storage unit 63 is a part that stores information necessary for the operation of the imaging apparatus 100, image data acquired by the imaging unit 50, and the like.
- the display unit 64 is a part that displays information to be presented to the user, captured images, and the like.
- the control unit 61 can perform various image processing on the image data obtained by the imaging unit 50.
- the specific function of the processing unit 60 is appropriately adjusted according to whether the imaging apparatus 100 is incorporated in a digital camera, a mobile phone, a PDA, or the like.
- the imaging lens 10 illustrated in FIG. 1 has the same configuration as the imaging lens 12 of Example 2 described later.
- the imaging lens 10 of the embodiment forms a subject image on a solid-state imaging device 51, and includes an aperture stop S, a first lens L1 having a positive refractive power, a negative lens, and a negative lens.
- the third lens L3 having positive or negative refractive power
- the fourth lens L4 having positive or negative refractive power
- the fifth lens L5 having negative refractive power
- at least one surface of the fifth lens L5 is an aspheric surface
- other surfaces constituting the imaging lens 10 for example, the image side surface of the third lens L3 can also be aspherical surfaces.
- the imaging lens 10 can include, for example, a parallel plate F as an optical element having substantially no power.
- the imaging surface I of the solid-state imaging device 51 is curved in a shallow concave spherical shape, and is a rotational surface having symmetry around the optical axis AX.
- the imaging surface (projection surface) I of the solid-state imaging device 51 on which the image light from the imaging lens 10 is incident is curved, it is possible to achieve both downsizing and high performance of the imaging lens 10 and the like. Specifically, since the imaging surface I is curved toward the imaging lens 10 at the periphery, the chief ray incident angle of the light beam incident on the imaging surface I becomes small. Therefore, the imaging lens 10 corrects the telecentric characteristic. Even if it is not performed sufficiently, the aperture efficiency does not decrease and the occurrence of shading can be suppressed. In addition, correction of curvature of field, distortion, coma, and the like is facilitated, and the imaging lens 10 and the like can be downsized.
- a positive group including a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 is disposed on the object side
- a negative group including a fifth lens L5 is disposed on the image side. It has become arranged in.
- This lens configuration of the telephoto type is advantageous for shortening the overall length of the imaging lens 10.
- the imaging lens 10 described above has the conditional expression (1) already described. -2.50 ⁇ f5 / f ⁇ -0.10 (1) Satisfied.
- f5 is the focal length of the fifth lens L5
- f is the focal length of the entire imaging lens 10.
- Conditional expression (1) is a conditional expression for appropriately setting the focal length of the fifth lens L5.
- the value of conditional expression (1) exceeds the lower limit, the negative focal length of the fifth lens L5 does not become unnecessarily small, and the telecentric characteristics at the periphery of the screen can be improved.
- the negative focal length of the fifth lens L5 can be appropriately reduced, which is advantageous for shortening the overall length of the imaging lens 10 and correcting chromatic aberration.
- the imaging lens 10 satisfies the following expression (1) ′ that further restricts the conditional expression (1). -2.40 ⁇ f5 / f ⁇ -0.30 (1) '
- the imaging lens 10 has the conditional expression (2) already described in addition to the conditional expression (1).
- SAGI is a displacement amount of the imaging surface (projection surface) I in the optical axis AX direction
- Y is a maximum image height.
- the imaging lens 10 satisfies the following expression (2) ′ that further restricts the conditional expression (2). 0.10 ⁇ SAGI / Y ⁇ 1.20 (2) '
- conditional expression (3) in addition to the conditional expression (1), the conditional expression (3) already described. -8.0 ⁇ RI / Y ⁇ -1.0 (3) Satisfied.
- RI is the radius of curvature of the imaging surface (projected surface) I
- Y is the maximum image height.
- the imaging lens 10 satisfies the following expression (3) ′ that further restricts the conditional expression (3). -7.0 ⁇ RI / Y ⁇ -1.5 (3) '
- conditional expression (4) in addition to the conditional expression (1), the conditional expression (4) already described. 0.4 ⁇ f1 / f ⁇ 2.0 (4) Satisfied.
- f1 is the focal length of the first lens L1
- f is the focal length of the entire imaging lens 10 system as described above.
- the imaging lens 10 satisfies the following expression (4) ′ that further restricts the conditional expression (4). 0.5 ⁇ f1 / f ⁇ 1.8 (4) ′
- conditional expression (5) in addition to the conditional expression (1), the conditional expression (5) already described. 0.50 ⁇ (r3 + r4) / (r3-r4) ⁇ 2.00 (5) Satisfied.
- r3 is the radius of curvature of the object side surface of the second lens L2
- r4 is the radius of curvature of the image side surface of the second lens L2.
- the imaging lens 10 satisfies the following expression (5) ′ that further restricts the conditional expression (5). 0.70 ⁇ (r3 + r4) / (r3-r4) ⁇ 1.90 (5) ′
- conditional expression (6) in addition to the conditional expression (1), the conditional expression (6) already described. 0.10 ⁇ fb / f ⁇ 0.70 (6) Satisfied.
- fb is the back focus of the imaging lens 10.
- the imaging lens 10 satisfies the following expression (6) ′ that further restricts the conditional expression (6). 0.10 ⁇ fb / f ⁇ 0.65 (6) ′
- the image side surface of the third lens L3 has an aspheric shape, and in addition to the conditional expression (1), the conditional expression (7) already described. 0.20 ⁇ f /
- f3 is the focal length of the third lens L3.
- the imaging lens 10 satisfies the following expression (7) ′ that further restricts the conditional expression (7). 0.30 ⁇ f /
- conditional expression (8) in addition to the conditional expression (8), the conditional expression (8) already described. 0.015 ⁇ PTZ / f ⁇ 0.045 (8) Satisfied.
- PTZ is the Petzval sum of the entire imaging lens 10 system.
- the imaging lens 10 satisfies the following expression (8) ′ that further restricts the conditional expression (8). 0.015 ⁇ PTZ / f ⁇ 0.040 (8) ′
- the aperture stop S is disposed between the first lens L1 and the second lens L2.
- the aperture stop S By arranging the aperture stop S in this way, the refraction angle of the peripheral marginal ray passing through the object side surface of the first lens L1 does not become too large, and both downsizing of the imaging lens 10 and good aberration correction are achieved. Can do.
- the aperture stop S can be disposed on the image side from the position P1 on the optical axis AX of the object side surface of the first lens L1 and on the object side from the most peripheral portion P2 of the object side surface of the first lens L1. .
- it is possible to suppress the occurrence of higher-order spherical aberration and coma aberration occurring in the first lens L1.
- the edge thickness of the first lens L1 is ensured and the moldability is improved.
- 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 first surface to 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 ⁇ d of lens material with respect to d-line: Abbe number of lens material
- the surface described with “*” after each surface number has an aspherical shape.
- Equation 1 The shape of the aspherical surface is expressed by the following “Equation 1” with the vertex of the surface as the origin, the X axis in the direction of the optical axis AX, and the height in the direction perpendicular to the optical axis AX as h.
- Ai i-order aspheric coefficient
- R radius of curvature
- K conic constant
- the lens surface data of Example 1 is shown in Table 1 below.
- the diaphragm means the aperture stop S, and the image means the imaging surface I.
- Table 1 Surface number R (mm) D (mm) Nd ⁇ d Effective radius (mm) 1 (Aperture) ⁇ -0.11 0.76 2 * 1.884 0.51 1.54470 56.2 0.76 3 * -45.319 0.06 0.82 4 * 8.277 0.23 1.63470 23.9 0.86 5 * 2.311 0.41 0.93 6 * 7.490 0.56 1.54470 56.2 1.38 7 * ⁇ 0.48 1.43 8 * -15.081 0.48 1.54470 56.2 1.67 9 * -2.721 1.12 2.01 10 * -2.998 0.54 1.53050 55.7 2.93 11 * 11.833 0.62 3.16 Statue -15.000
- Example 1 The single lens data of Example 1 is shown in Table 3 below. [Table 3] Lens Start surface Focal length (mm) 1 2 3.333 2 4 -5.127 3 6 13.752 4 8 6.014 5 10 -4.452
- FIG. 2 is a cross-sectional view of the imaging lens 11 or the imaging unit 50 of the first embodiment.
- the imaging lens 11 includes a positive birefringent first lens L1, a negative meniscus second lens L2 having negative refractive power, and a positive refractive power on the object side. And a fourth lens L4 having a positive refractive power and convex to the image side and having a meniscus, and a biconcave fifth lens L5 having a negative refractive power. All the lenses L1 to L5 are made of a plastic material.
- An aperture stop S is disposed on the object side of the first lens L1.
- the imaging surface I has a spherical shape.
- a parallel plate F shown in FIG. 1 can be disposed between the light exit surface of the fifth lens L5 and the concave imaging surface I.
- FIGS. 3A to 3C show aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 11 of Example 1
- FIGS. 3D and 3E show the meridional coma aberration of the imaging lens 11 of Example 1.
- Example 2 The lens surface data of Example 2 is shown in Table 4 below.
- Table 4 Surface number R (mm) D (mm) Nd ⁇ d Effective radius (mm) 1 ⁇ 0.00 1.43 2 * 2.246 0.79 1.54470 56.2 1.19 3 * -12.110 0.01 0.90 4 (Aperture) ⁇ 0.09 0.77 5 * 34.556 0.30 1.63200 23.4 0.79 6 * 3.139 0.25 0.91 7 * 6.535 0.54 1.54470 56.2 1.08 8 * -12.582 0.57 1.27 9 * -3.876 0.49 1.54470 56.2 1.59 10 * -1.471 0.17 1.78 11 * 9.065 0.51 1.54470 56.2 2.34 12 * 1.755 0.37 2.56 13 ⁇ 0.15 1.51630 64.1 2.79 14 ⁇ 0.77 2.84 Statue -10.346
- Example 2 The single lens data of Example 2 is shown in Table 6 below. [Table 6] Lens Start surface Focal length (mm) 1 2 3.547 2 5 -5.483 3 7 7.976 4 9 4.061 5 11 -4.095
- FIG. 4 is a cross-sectional view of the imaging lens 12 or the imaging unit 50 of the second embodiment.
- the imaging lens 12 has a positive birefringent first lens L1 having a positive refractive power, a negative meniscus second lens L2 having a negative refractive power and convex to the object side, and a biconvex having positive refractive power.
- a fourth meniscus lens L4 having a positive refractive power and convex toward the image side
- a fifth meniscus lens L5 having a negative refractive power and convex toward the object side. All the lenses L1 to L5 are made of a plastic material.
- An aperture stop S is disposed between the first lens L1 and the second lens L2.
- the imaging surface I has a spherical shape.
- a parallel flat plate F such as an IR cut filter, is disposed between the light exit surface of the fifth lens L5 and the concave imaging surface I.
- FIGS. 5A to 5C show aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 12 of Example 2, and FIGS. 5D and 5E show the meridional coma aberration of the imaging lens 12 of Example 2.
- Example 3 The lens surface data of Example 3 is shown in Table 7 below.
- Table 7 Surface number R (mm) D (mm) Nd ⁇ d Effective radius (mm) 1 (Aperture) ⁇ -0.06 0.76 2 * 1.720 0.57 1.54470 56.2 0.79 3 * -9.054 0.08 0.81 4 * -33.924 0.27 1.63470 23.9 0.80 5 * 3.178 0.29 0.85 6 * 5.525 0.48 1.54470 56.2 1.08 7 * ⁇ 0.56 1.20 8 * -6.135 0.50 1.54470 56.2 1.36 9 * -1.134 0.22 1.76 10 * -1.606 0.51 1.53 180 56.0 2.03 11 * 2.665 0.85 2.34 Statue -17.923
- Example 3 The single lens data of Example 3 is shown in Table 9 below. [Table 9] Lens Start surface Focal length (mm) 1 2 2.705 2 4 -4.565 3 6 10.144 4 8 2.466 5 10 -1.809
- FIG. 6 is a cross-sectional view of the imaging lens 13 or the imaging unit 50 of the third embodiment.
- the imaging lens 13 includes a first lens L1 having a positive refractive power and a biconvex first lens, a second lens L2 having a negative refractive power and a double concave, and a first lens having a positive refractive power and convex toward the object side.
- An aperture stop S is disposed on the object side of the first lens L1.
- the imaging surface I has a spherical shape.
- a parallel plate F shown in FIG. 1 can be disposed between the light exit surface of the fifth lens L5 and the concave imaging surface I.
- FIGS. 7A to 7C show aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 13 of Example 3, and FIGS. 7D and 7E show the meridional coma aberration of the imaging lens 13 of Example 3.
- the lens surface data of Example 4 is shown in Table 10 below.
- Table 10 Surface number R (mm) D (mm) Nd ⁇ d Effective radius (mm) 1 ⁇ 0.00 3.51 2 * 4.823 1.02 1.54470 56.2 3.02 3 * 22.519 0.10 2.79 4 * 26.718 0.50 1.63470 23.9 2.66 5 * 7.373 0.10 2.26 6 * 8.576 1.06 1.54470 56.2 2.13 7 * -20.787 0.12 1.72 8 (Aperture) ⁇ 0.54 1.45 9 * -215.025 1.81 1.54470 56.2 1.76 10 * -3.552 0.10 2.30 11 * -3.125 0.48 1.63470 23.9 2.42 12 * -4.964 1.28 2.68 13 ⁇ 0.30 1.51630 64.1 3.55 14 ⁇ 2.10 3.65 Statue -7.960
- Example 4 The single lens data of Example 4 is shown in Table 12 below. [Table 12] Lens Start surface Focal length (mm) 1 2 11.044 2 4 -16.207 3 6 11.290 4 9 6.610 5 11 -14.777
- FIG. 8 is a cross-sectional view of the imaging lens 14 or the imaging unit 50 of the fourth embodiment.
- the imaging lens 14 includes a first lens L1 having a positive refractive power and convex toward the object side, a second lens L2 having a negative refractive power and convex toward the object side, and a biconvex having a positive refractive power.
- a fourth meniscus lens L4 having positive refracting power and convex toward the image side
- a fifth meniscus lens L5 having negative refracting power and convex toward the image side. All the lenses L1 to L5 are made of a plastic material.
- An aperture stop S is disposed between the third lens L3 and the fourth lens L4.
- the imaging surface I has a spherical shape.
- a parallel flat plate F such as an IR cut filter, is disposed between the light exit surface of the fifth lens L5 and the concave imaging surface I.
- FIGS. 9A to 9C show aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 14 of Example 4, and FIGS. 9D and 9E show the meridional coma aberration of the imaging lens 14 of Example 4.
- Table 13 summarizes the values of Examples 1 to 4 corresponding to the conditional expressions (1) to (9) for reference. [Table 13]
- a curvature radius that takes into account the secondary aspherical coefficient in the reference curvature radius of the aspherical definition formula can be regarded as a paraxial curvature radius (for example, reference literature).
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Lenses (AREA)
Abstract
Description
L/2Y<1.20 … (9)
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:固体撮像素子の被投影面対角線長(固体撮像素子の矩形実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。
L/2Y<1.10 … (9)'
の範囲となるような撮像レンズを対象としている。
-2.50<f5/f<-0.10 … (1)
ただし、
f5:第5レンズの焦点距離
f:撮像レンズ全系の焦点距離
-2.40<f5/f<-0.30 … (1)'
0.05<SAGI/Y<1.50 … (2)
ただし、
SAGI:被投影面の光軸方向の変位量
Y:最大像高
0.10<SAGI/Y<1.20 … (2)'
-8.0<RI/Y<-1.0 … (3)
ただし、
RI:被投影面の曲率半径
Y:最大像高
-7.0<RI/Y<-1.5 … (3)'
0.4<f1/f<2.0 … (4)
ただし、
f1:第1レンズの焦点距離
f:撮像レンズ全系の焦点距離
0.5<f1/f<1.8 … (4)'
0.50<(r3+r4)/(r3-r4)<2.00 … (5)
ただし、
r3:第2レンズ物体側面の曲率半径
r4:第2レンズ像側面の曲率半径
0.70<(r3+r4)/(r3-r4)<1.90 … (5)'
0.10<fb/f<0.70 … (6)
ただし、
fb:撮像レンズのバックフォーカス
f:撮像レンズ全系の焦点距離
0.10<fb/f<0.65 … (6)'
0.20<f/|f3|<0.75 … (7)
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
0.30<f/|f3|<0.65 … (7)'
0.015<PTZ/f<0.045 … (8)
ただし、
PTZ:撮像レンズ全系のペッツバール和
f:撮像レンズ全系の焦点距離
ここで、
k:レンズ面数
rj:j番目の面の曲率半径
nj:j番目の面の入射側の屈折率
n'j:j番目の面の出射側の屈折率
0.015<PTZ/f<0.040 … (8)'
-2.50<f5/f<-0.10 … (1)
を満足する。ただし、f5は、第5レンズL5の焦点距離であり、fは撮像レンズ10全系の焦点距離である。
-2.40<f5/f<-0.30 … (1)'
0.05<SAGI/Y<1.50 … (2)
を満足する。ここで、SAGIは、撮像面(被投影面)Iの光軸AX方向の変位量であり、Yは、最大像高である。
0.10<SAGI/Y<1.20 … (2)'
-8.0<RI/Y<-1.0 … (3)
を満足する。ここで、RIは、撮像面(被投影面)Iの曲率半径であり、Yは、最大像高である。
-7.0<RI/Y<-1.5 … (3)'
0.4<f1/f<2.0 … (4)
を満足する。ここで、f1は、第1レンズL1の焦点距離であり、fは、既述のように撮像レンズ10全系の焦点距離である。
0.5<f1/f<1.8 … (4)'
0.50<(r3+r4)/(r3-r4)<2.00 … (5)
を満足する。ここで、r3は、第2レンズL2の物体側面の曲率半径であり、r4は、第2レンズL2の像側面の曲率半径である。
0.70<(r3+r4)/(r3-r4)<1.90 … (5)'
0.10<fb/f<0.70 … (6)
を満足する。ここで、fbは、撮像レンズ10のバックフォーカスである。
0.10<fb/f<0.65 … (6)'
0.20<f/|f3|<0.75 … (7)
を満足する。ここで、f3は、第3レンズL3の焦点距離である。
0.30<f/|f3|<0.65 … (7)'
0.015<PTZ/f<0.045 … (8)
を満足する。ここで、PTZは、撮像レンズ10全系のペッツバール和である。
0.015<PTZ/f<0.040 … (8)'
以下、本発明の撮像レンズの実施例を示す。各実施例に使用する記号は下記の通りである。
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
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AX方向にX軸をとり、光軸AX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
実施例1の撮像レンズの全体諸元を以下に示す。
f=4.23mm
fb=0.64mm
F=2.8
2Y=7.128mm
ENTP=0mm
EXTP=-2.46mm
H1=-1.55mm
H2=-3.59mm
〔表1〕
面番号 R(mm) D(mm) Nd νd 有効半径(mm)
1(絞り) ∞ -0.11 0.76
2* 1.884 0.51 1.54470 56.2 0.76
3* -45.319 0.06 0.82
4* 8.277 0.23 1.63470 23.9 0.86
5* 2.311 0.41 0.93
6* 7.490 0.56 1.54470 56.2 1.38
7* ∞ 0.48 1.43
8* -15.081 0.48 1.54470 56.2 1.67
9* -2.721 1.12 2.01
10* -2.998 0.54 1.53050 55.7 2.93
11* 11.833 0.62 3.16
像 -15.000
〔表2〕
第2面
K=-0.20272E-01, A4=0.21761E-02, A6=0.19366E-01, A8=-0.41471E-01,
A10=0.98748E-02, A12=0.71809E-01, A14=-0.65602E-01
第3面
K=0.30000E+02, A4=0.31067E-01, A6=-0.21519E-01, A8=0.78950E-02,
A10=0.10978E-02, A12=-0.38078E-01, A14=0.42116E-01
第4面
K=-0.11802E+02, A4=-0.21046E-01, A6=0.47780E-01, A8=-0.72465E-01,
A10=0.71978E-02, A12=0.65257E-01, A14=-0.35582E-01
第5面
K=-0.10927E+02, A4=0.67528E-01, A6=0.62994E-02, A8=-0.24145E-01,
A10=0.16680E-01, A12=0.84368E-02, A14=-0.62737E-02
第6面
K=0.22585E+02, A4=-0.34345E-01, A6=0.43294E-02, A8=0.17186E-01,
A10=-0.11446E-01, A12=0.52380E-02, A14=-0.10561E-02
第7面
K=0.0, A4=-0.43789E-01, A6=0.66696E-02, A8=-0.44142E-02,
A10=0.28354E-02, A12=0.12391E-02, A14=-0.12019E-03
第8面
K=-0.25247E+02, A4=-0.22966E-01, A6=0.10703E-01, A8=-0.64318E-02,
A10=-0.13726E-03, A12=0.67066E-03, A14=-0.10982E-03
第9面
K=-0.62257E+01, A4=-0.19084E-01, A6=0.19780E-01, A8=-0.30251E-02,
A10=-0.20296E-03, A12=0.54352E-04, A14=-0.30457E-05
第10面
K=-0.21964E+01, A4=-0.17840E-01, A6=0.43295E-02, A8=0.39813E-06
A10=-0.32980E-04, A12=0.57871E-06, A14=0.77501E-07
第11面
K=0.37078E+01, A4=-0.27884E-01, A6=0.36214E-02, A8=-0.50977E-03
A10=0.39976E-04, A12=-0.12880E-05, A14=0.21403E-07
なお、これ以降(表のレンズデータを含む)において、10のべき乗数(たとえば2.5×10-02)をE(たとえば2.5E-02)を用いて表すものとする。
〔表3〕
レンズ 始面 焦点距離(mm)
1 2 3.333
2 4 -5.127
3 6 13.752
4 8 6.014
5 10 -4.452
実施例2の撮像レンズの全体諸元を以下に示す。
f=3.77mm
fB=0.78mm
F=2.22
2Y=5.744mm
ENTP=0.59mm
EXTP=-2.47mm
H1=-0.02mm
H2=-2.99mm
〔表4〕
面番号 R(mm) D(mm) Nd νd 有効半径(mm)
1 ∞ 0.00 1.43
2* 2.246 0.79 1.54470 56.2 1.19
3* -12.110 0.01 0.90
4(絞り) ∞ 0.09 0.77
5* 34.556 0.30 1.63200 23.4 0.79
6* 3.139 0.25 0.91
7* 6.535 0.54 1.54470 56.2 1.08
8* -12.582 0.57 1.27
9* -3.876 0.49 1.54470 56.2 1.59
10* -1.471 0.17 1.78
11* 9.065 0.51 1.54470 56.2 2.34
12* 1.755 0.37 2.56
13 ∞ 0.15 1.51630 64.1 2.79
14 ∞ 0.77 2.84
像 -10.346
〔表5〕
第2面
K=-0.45246E+00, A4=-0.10932E-01, A6=0.36384E-02, A8=-0.18871E-01,
A10=0.12051E-01, A12=-0.44115E-02, A14=0.10313E-03
第3面
K=0.49619E+02, A4=-0.36300E-01, A6=0.10895E+00, A8=-0.19197E+00,
A10=0.19397E+00, A12=-0.11550E+00, A14=0.28105E-01
第5面
K=0.40042E+01, A4=-0.49226E-01, A6=0.18739E+00, A8=-0.21870E+00,
A10=0.13043E+00, A12=-0.33590E-01, A14=-0.18412E-03
第6面
K=-0.95512E+01, A4=-0.93803E-02, A6=0.11060E+00, A8=-0.81446E-01,
A10=0.22637E-01, A12=-0.65756E-02, A14=0.59251E-02
第7面
K=0.24268E+02, A4=-0.64209E-01, A6=-0.91824E-02, A8=0.48691E-01,
A10=-0.69118E-01, A12=0.52774E-01, A14=-0.16442E-01
第8面
K=-0.25925E+02, A4=-0.37441E-01, A6=0.27196E-02, A8=-0.19187E-01,
A10=0.89742E-02, A12=0.23239E-02, A14=-0.68528E-03
第9面
K=0.33241E+01, A4=0.15964E-01, A6=0.84941E-02, A8=-0.64774E-02,
A10=-0.14912E-02, A12=0.17909E-02, A14=-0.24621E-03
第10面
K=-0.49008E+01, A4=-0.43541E-01, A6=0.32728E-01, A8=-0.30077E-02,
A10=-0.99776E-04, A12=-0.37246E-03, A14=0.81688E-04
第11面
K=0.39174E+01, A4=-0.93039E-01, A6=0.23650E-01, A8=-0.45756E-03,
A10=-0.57828E-03, A12=0.80939E-04, A14=-0.32607E-05
第12面
K=-0.92347E+01, A4=-0.54027E-01, A6=0.13428E-01, A8=-0.25193E-02,
A10=0.26760E-03, A12=-0.99631E-05, A14=-0.67193E-07
〔表6〕
レンズ 始面 焦点距離(mm)
1 2 3.547
2 5 -5.483
3 7 7.976
4 9 4.061
5 11 -4.095
実施例3の撮像レンズの全体諸元を以下に示す。
f=3.66mm
fB=0.85mm
F=2.4
2Y=5.71mm
ENTP=0mm
EXTP=-1.81mm
H1=-1.38mm
H2=-2.81mm
〔表7〕
面番号 R(mm) D(mm) Nd νd 有効半径(mm)
1(絞り) ∞ -0.06 0.76
2* 1.720 0.57 1.54470 56.2 0.79
3* -9.054 0.08 0.81
4* -33.924 0.27 1.63470 23.9 0.80
5* 3.178 0.29 0.85
6* 5.525 0.48 1.54470 56.2 1.08
7* ∞ 0.56 1.20
8* -6.135 0.50 1.54470 56.2 1.36
9* -1.134 0.22 1.76
10* -1.606 0.51 1.53180 56.0 2.03
11* 2.665 0.85 2.34
像 -17.923
〔表8〕
第2面
K=-0.75132E+00, A4=-0.16106E-01, A6=-0.74358E-02, A8=-0.14477E+00,
A10=0.18711E+00, A12=-0.17476E+00
第3面
K=0.30000E+02, A4=-0.74079E-01, A6=0.75740E-01, A8=-0.25801E+00,
A10=0.13961E+00
第4面
K=-0.30000E+02, A4=-0.24920E-01, A6=0.24525E+00, A8=-0.41253E+00,
A10=0.26638E+00
第5面
K=-0.29129E+02, A4=0.10348E+00, A6=0.69009E-01, A8=0.27019E-02,
A10=-0.10666E+00, A12=0.95099E-01
第6面
K=-0.30000E+02, A4=-0.11318E+00, A6=0.61724E-01, A8=-0.41786E-01,
A10=0.40932E-01, A12=0.68663E-01, A14=-0.44680E-01
第7面
K=0.0, A4=-0.11322E+00, A6=0.12944E-01, A8=-0.19284E-01,
A10=0.11119E-01, A12=0.10976E-01, A14=0.12316E-01, A16=-0.23129E-02
第8面
K=-0.30000E+02, A4=-0.81070E-01, A6=0.12107E-01, A8=0.57044E-02,
A10=-0.27163E-01, A12=0.31239E-02, A14=0.78774E-02, A16=-0.21597E-02
第9面
K=-0.42975E+01, A4=-0.69868E-01, A6=0.76015E-01, A8=-0.15567E-01,
A10=-0.16435E-02, A12=0.34413E-03, A14=0.16006E-03, A16=-0.36705E-04
第10面
K=-0.73593E+01, A4=-0.80461E-01, A6=0.30333E-01, A8=0.11607E-02,
A10=-0.10572E-02, A12=-0.94938E-04, A14=0.34068E-04, A16=-0.56844E-06
第11面
K=-0.28203E+02, A4=-0.46691E-01, A6=0.99459E-02, A8=-0.30392E-02,
A10=0.52059E-03, A12=-0.32382E-04, A14=-0.78153E-05, A16=0.12490E-05
〔表9〕
レンズ 始面 焦点距離(mm)
1 2 2.705
2 4 -4.565
3 6 10.144
4 8 2.466
5 10 -1.809
実施例4の撮像レンズの全体諸元を以下に示す。
f=6.34mm
fB=2.1mm
F=1.8
2Y=8mm
ENTP=2.49mm
EXTP=-4mm
H1=2.24mm
H2=-4.24mm
〔表10〕
面番号 R(mm) D(mm) Nd νd 有効半径(mm)
1 ∞ 0.00 3.51
2* 4.823 1.02 1.54470 56.2 3.02
3* 22.519 0.10 2.79
4* 26.718 0.50 1.63470 23.9 2.66
5* 7.373 0.10 2.26
6* 8.576 1.06 1.54470 56.2 2.13
7* -20.787 0.12 1.72
8(絞り) ∞ 0.54 1.45
9* -215.025 1.81 1.54470 56.2 1.76
10* -3.552 0.10 2.30
11* -3.125 0.48 1.63470 23.9 2.42
12* -4.964 1.28 2.68
13 ∞ 0.30 1.51630 64.1 3.55
14 ∞ 2.10 3.65
像 -7.960
〔表11〕
第2面
K=-0.98021E+00, A4=-0.13550E-02, A6=-0.21549E-03, A8=-0.11299E-04,
A10=0.15262E-06, A12=0.16640E-07
第3面
K=-0.47977E+02, A4=-0.10976E-02, A6=0.10689E-03, A8=-0.56468E-06,
A10=-0.15273E-05, A12=0.24576E-07
第4面
K=0.25389E+02, A4=0.29782E-03, A6=-0.20468E-03, A8=-0.19191E-06,
A10=0.42780E-05, A12=-0.13211E-06
第5面
K=0.20238E+01, A4=0.10550E-03, A6=-0.17248E-03, A8=0.34116E-04,
A10=-0.10149E-04, A12=0.13595E-05
第6面
K=0.11217E+02, A4=0.51395E-03, A6=0.11592E-02, A8=-0.21566E-05,
A10=-0.59504E-05
第7面
K=-0.18723E+02, A4=0.23481E-02, A6=0.78826E-03, A8=-0.38120E-04,
A10=0.43611E-05
第9面
K=0.50000E+02, A4=-0.37361E-02, A6=-0.39584E-03, A8=-0.50882E-03,
A10=0.17560E-03, A12=-0.46005E-04
第10面
K=0.66095E+00, A4=-0.22804E-02, A6=0.44448E-03, A8=-0.40727E-04,
A10=0.76468E-05, A12=-0.25651E-05
第11面
K=-0.11279E+01, A4=0.49302E-02, A6=-0.12008E-03, A8=0.83824E-05,
A10=0.78230E-07, A12=0.80519E-06
第12面
K=-0.59055E+01, A4=0.44021E-02, A6=-0.10967E-03, A8=-0.17941E-04,
A10=0.29445E-05, A12=-0.20180E-07
〔表12〕
レンズ 始面 焦点距離(mm)
1 2 11.044
2 4 -16.207
3 6 11.290
4 9 6.610
5 11 -14.777
Claims (13)
- 撮像装置に設けられた被投影面に被写体像を結像させるための撮像レンズであって、
前記被投影面は、画面周辺部に向かう任意の断面で物体側へ倒れるように湾曲しており、
前記撮像レンズは、物体側より順に、
正の屈折力を有する第1レンズと、
負の屈折力を有する第2レンズと、
正又は負の屈折力を有する第3レンズと、
正又は負の屈折力を有する第4レンズと、
少なくとも1面が非球面とされ、負の屈折力を有する第5レンズと、からなり、
以下の条件式を満足する前記撮像装置用の撮像レンズ。
-2.50<f5/f<-0.10 … (1)
ただし、
f5:前記第5レンズの焦点距離
f:撮像レンズ全系の焦点距離 - 前記被投影面の湾曲量は、以下の条件式を満足する、請求項1に記載の撮像レンズ。
0.05<SAGI/Y<1.50 … (2)
ただし、
SAGI:前記被投影面の光軸方向の変位量
Y:最大像高 - 前記被投影面は、球面形状を有し、以下の条件式を満足する、請求項1及び2のいずれか1項に記載の撮像レンズ。
-8.0<RI/Y<-1.0 … (3)
ただし、
RI:前記被投影面の曲率半径
Y:最大像高 - 前記第1レンズは、物体側に凸面を向けた形状であり、以下の条件式を満足する、請求項1に記載の撮像レンズ。
0.4<f1/f<2.0 … (4)
ただし、
f1:前記第1レンズの焦点距離
f:撮像レンズ全系の焦点距離 - 前記第2レンズは、像側に凹面を向けた形状であり、以下の条件式を満足する、請求項1に記載の撮像レンズ。
0.50<(r3+r4)/(r3-r4)<2.00 … (5)
ただし、
r3:前記第2レンズ物体側面の曲率半径
r4:前記第2レンズ像側面の曲率半径 - 以下の条件式を満足する、請求項1に記載の撮像レンズ。
0.10<fb/f<0.70 … (6)
ただし、
fb:前記撮像レンズのバックフォーカス
f:撮像レンズ全系の焦点距離 - 前記第3レンズの像側面は非球面形状を有し、以下の条件式を満足する、請求項1に記載の撮像レンズ。
0.20<f/|f3|<0.75 … (7)
ただし、
f:撮像レンズ全系の焦点距離
f3:前記第3レンズの焦点距離 - 以下の条件式を満足する、請求項1に記載の撮像レンズ。
0.015<PTZ/f<0.045 … (8)
ただし、
PTZ:撮像レンズ全系のペッツバール和
f:撮像レンズ全系の焦点距離 - 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、開口絞りが配置されている、請求項1に記載の撮像レンズ。
- 前記第1レンズと前記第2レンズとの間に、開口絞りが配置されている、請求項1に記載の撮像レンズ。
- 前記第3レンズと前記第4レンズとの間に、開口絞りを配置した、請求項1に記載の撮像レンズ。
- 実質的にパワーを持たないレンズをさらに有する、請求項1に記載の撮像レンズ。
- 請求項1に記載の撮像レンズを有する撮像装置。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2013529981A JP5839038B2 (ja) | 2011-08-19 | 2012-08-15 | 撮像レンズ及び撮像装置 |
US14/239,724 US9557528B2 (en) | 2011-08-19 | 2012-08-15 | Image pickup lens and image pickup device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011-179992 | 2011-08-19 | ||
JP2011179992 | 2011-08-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013027641A1 true WO2013027641A1 (ja) | 2013-02-28 |
Family
ID=47746386
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2012/070773 WO2013027641A1 (ja) | 2011-08-19 | 2012-08-15 | 撮像レンズ及び撮像装置 |
Country Status (3)
Country | Link |
---|---|
US (1) | US9557528B2 (ja) |
JP (1) | JP5839038B2 (ja) |
WO (1) | WO2013027641A1 (ja) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013210549A (ja) * | 2012-03-30 | 2013-10-10 | Canon Inc | 撮像装置 |
JP2013210534A (ja) * | 2012-03-30 | 2013-10-10 | Canon Inc | 撮像装置 |
JP5513641B1 (ja) * | 2013-02-20 | 2014-06-04 | 株式会社AAC Technologies Japan R&D Center | 撮像レンズ |
CN104142561A (zh) * | 2014-04-16 | 2014-11-12 | 玉晶光电(厦门)有限公司 | 一种光学成像镜头及应用此镜头之电子装置 |
JP2015200855A (ja) * | 2014-04-10 | 2015-11-12 | カンタツ株式会社 | 撮像レンズ |
WO2016084117A1 (ja) * | 2014-11-28 | 2016-06-02 | 株式会社ニコン | 撮像レンズおよび撮像装置 |
JP2016153912A (ja) * | 2016-04-14 | 2016-08-25 | キヤノン株式会社 | 撮像装置 |
US9453986B2 (en) | 2012-03-30 | 2016-09-27 | Canon Kabushiki Kaisha | Imaging apparatus having a curved image surface |
WO2016178260A1 (ja) * | 2015-05-01 | 2016-11-10 | 株式会社ニコン | 撮像レンズおよび撮像装置 |
JP2017102211A (ja) * | 2015-11-30 | 2017-06-08 | コニカミノルタ株式会社 | 撮像レンズ及び撮像装置 |
KR101748569B1 (ko) | 2014-11-24 | 2017-07-03 | 부산대학교 산학협력단 | 어안 렌즈계 |
CN108064352A (zh) * | 2016-09-14 | 2018-05-22 | 深圳市柔宇科技有限公司 | 光学系统及使用该光学系统的头戴显示装置 |
KR20190080527A (ko) * | 2017-12-28 | 2019-07-08 | 오필름코리아(주) | 촬상 광학계 |
US10488633B2 (en) | 2015-01-09 | 2019-11-26 | Nikon Corporation | Imaging lens and image capturing device |
WO2022047995A1 (zh) * | 2020-09-03 | 2022-03-10 | 诚瑞光学(深圳)有限公司 | 摄像光学镜头 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9798054B1 (en) * | 2016-03-30 | 2017-10-24 | Delphi Technologies, Inc. | Camera assembly for use on a vehicle |
WO2019037466A1 (zh) * | 2017-08-23 | 2019-02-28 | 浙江舜宇光学有限公司 | 摄像镜头 |
CN110876001B (zh) * | 2018-08-31 | 2022-05-17 | 南昌欧菲光电技术有限公司 | 摄像光学系统及电子装置 |
CN111175943B (zh) * | 2020-02-24 | 2021-09-28 | 诚瑞光学(常州)股份有限公司 | 摄像光学镜头 |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62125312A (ja) * | 1985-11-27 | 1987-06-06 | Olympus Optical Co Ltd | 写真レンズ |
JPH06222260A (ja) * | 1993-01-22 | 1994-08-12 | Minolta Camera Co Ltd | 大口径写真レンズ |
JP2004312239A (ja) * | 2003-04-04 | 2004-11-04 | Mitsubishi Electric Corp | 撮像装置 |
JP2006184783A (ja) * | 2004-12-28 | 2006-07-13 | Fujinon Corp | 撮像装置 |
WO2010024198A1 (ja) * | 2008-08-25 | 2010-03-04 | コニカミノルタオプト株式会社 | 撮像レンズ、撮像装置及び携帯端末 |
JP2010079296A (ja) * | 2008-08-28 | 2010-04-08 | Konica Minolta Opto Inc | 撮像レンズ及び小型撮像装置 |
JP2010197665A (ja) * | 2009-02-25 | 2010-09-09 | Olympus Corp | 撮像光学系及びそれを備える撮像装置 |
JP2010224521A (ja) * | 2009-02-27 | 2010-10-07 | Konica Minolta Opto Inc | 撮像レンズ、撮像装置及び携帯端末 |
WO2011052444A1 (ja) * | 2009-10-30 | 2011-05-05 | 株式会社オプトロジック | 撮像レンズ |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0868935A (ja) | 1994-06-24 | 1996-03-12 | Konica Corp | トリプレットレンズを有するカメラ |
JP2000292688A (ja) | 1999-04-02 | 2000-10-20 | Canon Inc | 撮影レンズを備えた撮像装置 |
JP4506081B2 (ja) * | 2003-02-06 | 2010-07-21 | コニカミノルタホールディングス株式会社 | 光ピックアップ装置 |
US7027231B2 (en) * | 2003-02-14 | 2006-04-11 | Fujinon Corporation | Endoscope objective lens |
JP2004264449A (ja) * | 2003-02-28 | 2004-09-24 | Fuji Photo Optical Co Ltd | 高倍率4群ズームレンズ |
JP4046163B2 (ja) | 2003-05-27 | 2008-02-13 | 松下電器産業株式会社 | 撮像装置 |
US7826149B2 (en) * | 2008-12-27 | 2010-11-02 | Largan Precision Co., Ltd. | Optical lens system for taking image |
JP5348563B2 (ja) * | 2010-01-13 | 2013-11-20 | コニカミノルタ株式会社 | 撮像レンズ、撮像装置及び携帯端末 |
TWI429980B (zh) * | 2011-05-11 | 2014-03-11 | Largan Precision Co Ltd | 影像拾取鏡頭組 |
TWI416163B (zh) * | 2011-07-19 | 2013-11-21 | Largan Precision Co Ltd | 光學影像拾取鏡頭 |
-
2012
- 2012-08-15 US US14/239,724 patent/US9557528B2/en active Active
- 2012-08-15 JP JP2013529981A patent/JP5839038B2/ja active Active
- 2012-08-15 WO PCT/JP2012/070773 patent/WO2013027641A1/ja active Application Filing
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62125312A (ja) * | 1985-11-27 | 1987-06-06 | Olympus Optical Co Ltd | 写真レンズ |
JPH06222260A (ja) * | 1993-01-22 | 1994-08-12 | Minolta Camera Co Ltd | 大口径写真レンズ |
JP2004312239A (ja) * | 2003-04-04 | 2004-11-04 | Mitsubishi Electric Corp | 撮像装置 |
JP2006184783A (ja) * | 2004-12-28 | 2006-07-13 | Fujinon Corp | 撮像装置 |
WO2010024198A1 (ja) * | 2008-08-25 | 2010-03-04 | コニカミノルタオプト株式会社 | 撮像レンズ、撮像装置及び携帯端末 |
JP2010079296A (ja) * | 2008-08-28 | 2010-04-08 | Konica Minolta Opto Inc | 撮像レンズ及び小型撮像装置 |
JP2010197665A (ja) * | 2009-02-25 | 2010-09-09 | Olympus Corp | 撮像光学系及びそれを備える撮像装置 |
JP2010224521A (ja) * | 2009-02-27 | 2010-10-07 | Konica Minolta Opto Inc | 撮像レンズ、撮像装置及び携帯端末 |
WO2011052444A1 (ja) * | 2009-10-30 | 2011-05-05 | 株式会社オプトロジック | 撮像レンズ |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9453986B2 (en) | 2012-03-30 | 2016-09-27 | Canon Kabushiki Kaisha | Imaging apparatus having a curved image surface |
JP2013210534A (ja) * | 2012-03-30 | 2013-10-10 | Canon Inc | 撮像装置 |
JP2013210549A (ja) * | 2012-03-30 | 2013-10-10 | Canon Inc | 撮像装置 |
JP5513641B1 (ja) * | 2013-02-20 | 2014-06-04 | 株式会社AAC Technologies Japan R&D Center | 撮像レンズ |
JP2014160154A (ja) * | 2013-02-20 | 2014-09-04 | Aac Technologies Japan R&D Center Ltd | 撮像レンズ |
JP2015200855A (ja) * | 2014-04-10 | 2015-11-12 | カンタツ株式会社 | 撮像レンズ |
CN104142561A (zh) * | 2014-04-16 | 2014-11-12 | 玉晶光电(厦门)有限公司 | 一种光学成像镜头及应用此镜头之电子装置 |
KR101748569B1 (ko) | 2014-11-24 | 2017-07-03 | 부산대학교 산학협력단 | 어안 렌즈계 |
WO2016084117A1 (ja) * | 2014-11-28 | 2016-06-02 | 株式会社ニコン | 撮像レンズおよび撮像装置 |
JPWO2016084117A1 (ja) * | 2014-11-28 | 2017-09-21 | 株式会社ニコン | 撮像レンズおよび撮像装置 |
US10488633B2 (en) | 2015-01-09 | 2019-11-26 | Nikon Corporation | Imaging lens and image capturing device |
WO2016178260A1 (ja) * | 2015-05-01 | 2016-11-10 | 株式会社ニコン | 撮像レンズおよび撮像装置 |
JPWO2016178260A1 (ja) * | 2015-05-01 | 2018-02-22 | 株式会社ニコン | 撮像レンズおよび撮像装置 |
JP2017102211A (ja) * | 2015-11-30 | 2017-06-08 | コニカミノルタ株式会社 | 撮像レンズ及び撮像装置 |
JP2016153912A (ja) * | 2016-04-14 | 2016-08-25 | キヤノン株式会社 | 撮像装置 |
CN108064352A (zh) * | 2016-09-14 | 2018-05-22 | 深圳市柔宇科技有限公司 | 光学系统及使用该光学系统的头戴显示装置 |
KR20190080527A (ko) * | 2017-12-28 | 2019-07-08 | 오필름코리아(주) | 촬상 광학계 |
KR102004423B1 (ko) | 2017-12-28 | 2019-07-26 | 오필름코리아(주) | 촬상 광학계 |
WO2022047995A1 (zh) * | 2020-09-03 | 2022-03-10 | 诚瑞光学(深圳)有限公司 | 摄像光学镜头 |
Also Published As
Publication number | Publication date |
---|---|
US20140209786A1 (en) | 2014-07-31 |
JPWO2013027641A1 (ja) | 2015-03-19 |
JP5839038B2 (ja) | 2016-01-06 |
US9557528B2 (en) | 2017-01-31 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5839038B2 (ja) | 撮像レンズ及び撮像装置 | |
JP5304117B2 (ja) | 撮像レンズ及び撮像装置並びに携帯端末 | |
JP6347156B2 (ja) | 撮像レンズ、撮像装置及び携帯端末 | |
JP6175903B2 (ja) | 撮像レンズ、撮像装置及び携帯端末 | |
JP4858648B2 (ja) | 撮像レンズ、撮像装置及び携帯端末 | |
JP6394598B2 (ja) | 撮像レンズ、撮像装置及び携帯端末 | |
US9335512B2 (en) | Image capturing lens and image capturing apparatus provided with the image capturing lens | |
WO2013137312A1 (ja) | 撮像レンズ、撮像装置、及び携帯端末 | |
JP6451639B2 (ja) | 撮像装置及び携帯端末 | |
JP2014115431A (ja) | 撮像レンズ、撮像装置、及び携帯端末 | |
WO2013008862A1 (ja) | 撮像レンズ及び撮像装置 | |
JP2011095301A (ja) | 撮像レンズ、撮像装置及び携帯端末 | |
JP2013092584A (ja) | 撮像レンズ、撮像装置及び携帯端末 | |
JP2013156457A (ja) | 撮像レンズ、撮像装置、及び携帯端末 | |
JP5644681B2 (ja) | 撮像装置及び携帯端末 | |
WO2011092983A1 (ja) | 撮像レンズ | |
WO2014034025A1 (ja) | 撮像レンズおよび撮像レンズを備えた撮像装置 | |
WO2014034027A1 (ja) | 撮像レンズおよび撮像レンズを備えた撮像装置 | |
JP2015084066A (ja) | 撮像レンズ、撮像装置及び携帯端末 | |
WO2012114970A1 (ja) | 撮像レンズ、撮像装置及び携帯端末 | |
WO2014073685A1 (ja) | 撮像レンズ、撮像装置及び携帯端末 | |
JP2013024892A (ja) | 撮像レンズ及び撮像装置 | |
JP2012230233A (ja) | 撮像レンズ、撮像装置及び携帯端末 | |
WO2012173026A1 (ja) | 撮像装置用の撮像レンズ及び撮像装置 | |
WO2013145989A1 (ja) | 撮像レンズ、撮像装置及び携帯端末 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 12825978 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2013529981 Country of ref document: JP Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14239724 Country of ref document: US |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 12825978 Country of ref document: EP Kind code of ref document: A1 |