WO2012176433A1 - 撮像レンズおよび撮像装置 - Google Patents
撮像レンズおよび撮像装置 Download PDFInfo
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- WO2012176433A1 WO2012176433A1 PCT/JP2012/003983 JP2012003983W WO2012176433A1 WO 2012176433 A1 WO2012176433 A1 WO 2012176433A1 JP 2012003983 W JP2012003983 W JP 2012003983W WO 2012176433 A1 WO2012176433 A1 WO 2012176433A1
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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
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/60—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having five components only
Definitions
- the present invention relates to an imaging lens and an imaging device, and more specifically, suitable for use in an in-vehicle camera, a monitoring camera, or the like using an imaging element such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor).
- an imaging element such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor).
- CCD Charge Coupled Device
- CMOS Complementary Metal Oxide Semiconductor
- image sensors such as CCDs and CMOSs have been greatly reduced in size and pixels.
- the imaging device body and the imaging lens mounted thereon are also required to be small and light.
- imaging lenses used for in-vehicle cameras, surveillance cameras, etc. are required to have high weather resistance and high optical performance with a wide angle of view so as to ensure a good field of view over a wide range. Yes.
- Patent Documents 1 to 3 describe an imaging lens having a five-lens configuration including an aspheric lens.
- the lens described in Patent Document 1 is relatively bright with an F value of 2.0, but when applied to an imaging lens having a total angle of view of less than 163 degrees and a total angle of view of more than 180 degrees, performance is insufficient. .
- Patent Documents 2 and 3 have a wide angle of 190 degrees or more but an F value of 2.8. For this reason, if it is attempted to brighten the F value to 2.0 or increase the total angle of view to a degree exceeding 210 degrees, the performance will be degraded.
- an object of the present invention is to provide an imaging lens capable of realizing a wide angle and high optical performance while being small and low-cost, and an imaging apparatus including the imaging lens. .
- the first imaging lens of the present invention in order from the object side, A first lens having a meniscus shape with a convex surface facing the object side and having negative power; A second lens having a negative power in the vicinity of the optical axis, the image side surface being convex toward the image side; A third lens with positive power; Aperture, A fourth lens with positive power; It consists essentially of 5 lenses with a 5th lens with negative power, Among the lens surfaces of the first lens to the fifth lens, at least one surface is an aspheric surface, The following conditional expression (2-1) is satisfied.
- L Distance on the optical axis from the object-side surface of the first lens to the image plane (the air-converted distance between the fifth lens and the image plane)
- d1-4 Distance on the optical axis from the object-side surface of the first lens to the image-side surface of the second lens
- the second imaging lens according to the present invention is arranged in order from the object side.
- L Distance on the optical axis from the object-side surface of the first lens to the image plane (the air-converted distance between the fifth lens and the image plane)
- d1-4 Distance on the optical axis from the object-side surface of the first lens to the image-side surface of the second lens regarding the first lens “a meniscus shape with a convex surface facing the object side and negative “Having power” is considered in the paraxial region when the first lens has an aspherical surface.
- Essentially composed of five lenses means, in addition to five lenses, lenses having substantially no power, optical elements other than lenses such as an aperture and a cover glass, lens flanges, lens barrels, and image sensors. It is meant to include those having a mechanism part such as a camera shake correction mechanism.
- the positive / negative power is considered in the paraxial region unless otherwise specified.
- conditional expressions (1) to (13) are satisfied.
- it may have any one of the following conditional expressions (1) to (13), or may have a structure in which any two or more are combined.
- conditional expressions (7-1) to (13-1) are satisfied.
- one having any one of the following conditional expressions (7-1) to (13-1) may be used, or a combination of any two or more may be used.
- An image pickup apparatus of the present invention includes the above-described image pickup lens of the present invention.
- the shape and power of each lens are preferably set, and conditional expressions (2-1) and (2-2) are set respectively. Therefore, it is possible to realize a sufficiently wide angle, a sufficient brightness, and a high optical performance with a low cost and a small size.
- the imaging apparatus of the present invention since it includes the first or second imaging lens of the present invention, it can be configured inexpensively and compactly, can be imaged with a wide angle of view, and obtains a high-quality image. be able to.
- Sectional drawing which shows the lens structure and optical path of the imaging lens of Example 1 of this invention Sectional drawing which shows the lens structure and optical path of the imaging lens of Example 2 of this invention. Sectional drawing which shows the lens structure and optical path of the imaging lens of Example 3 of this invention. Sectional drawing which shows the lens structure and optical path of the imaging lens of Example 4 of this invention. Sectional drawing which shows the lens structure and optical path of the imaging lens of Example 5 of this invention. Sectional drawing which shows the lens structure and optical path of the imaging lens of Example 6 of this invention. Sectional drawing which shows the lens structure and optical path of the imaging lens of Example 7 of this invention. Sectional drawing which shows the lens structure and optical path of the imaging lens of Example 8 of this invention.
- Aberration diagrams (A) to (G) of the imaging lens of Example 1 of the present invention Aberration diagrams (A) to (G) of the imaging lens of Example 2 of the present invention.
- Aberration diagrams (A) to (G) of the image pickup lens of Example 3 of the present invention Aberration diagrams (A) to (G) of the image pickup lens of Example 4 of the present invention.
- Aberration diagrams (A) to (G) of the image pickup lens of Example 8 of the present invention The figure for demonstrating arrangement
- FIGS. 1 to 8 are cross-sectional views showing a configuration example of an imaging lens according to an embodiment of the present invention, and correspond to imaging lenses of Examples 1 to 8 described later, respectively.
- the basic configuration of the example shown in FIGS. 1 to 8 is the same, and the method of illustration is also the same, so here, mainly referring to FIG. 1, according to the first and second embodiments of the present invention.
- the imaging lens will be described.
- the imaging lens according to the first embodiment of the present invention includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 in order from the object side along the optical axis Z.
- This is a five-lens lens system in which a fifth lens L5 is arranged.
- An aperture stop St is disposed between the third lens L3 and the fourth lens L4. By arranging the aperture stop St between the third lens L3 and the fourth lens L4, it is possible to reduce the size in the radial direction.
- FIG. 1 the left side is the object side and the right side is the image side, and the illustrated aperture stop St does not necessarily indicate the size or shape, but indicates the position on the optical axis.
- FIG. 1 also shows an axial light beam 2 from an object point at an infinite distance and an off-axis light beam 3 at the maximum field angle.
- the imaging element 5 disposed on the image plane Sim of the imaging lens is also illustrated in consideration of the case where the imaging lens is applied to the imaging device.
- the imaging lens is applied to the imaging apparatus, it is preferable to provide a cover glass, a low-pass filter, an infrared cut filter, or the like according to the configuration of the camera side on which the lens is mounted.
- positioned between the 5th lens L5 and the image pick-up element 5 (image surface Sim) has shown the parallel-plate-shaped optical member PP made.
- the first lens L1 has a negative power and is configured to be a meniscus lens having a convex object-side surface.
- the first lens L1 having negative power and a meniscus lens having a convex surface on the object side is advantageous for widening the angle and correcting distortion.
- the first lens L1 disposed closest to the object side is assumed to be exposed to wind and rain or a cleaning solvent.
- the object side surface of the first lens L1 is a convex surface, there is a concern in these situations. There is also an advantage that dust, dust, water droplets, and the like hardly remain.
- the first lens L1 is a spherical lens, but may be an aspheric lens.
- the material of the first lens L1 disposed closest to the object side is preferably glass rather than resin. Therefore, if the first lens L1 is a spherical lens, an aspherical lens is used. Can be manufactured at a lower cost.
- All of the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 have an aspherical shape on at least one surface.
- the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are preferably aspheric on both surfaces.
- the second lens L2 is configured so that the image side surface is convex toward the image side and has negative power in the vicinity of the optical axis.
- points Q1 and Q2 are the two points at the outermost end of the effective diameter of the image side surface of the second lens L2, and the point Q3 is on the optical axis on the image side surface of the second lens L2. Is a point.
- arc C2 is an arc passing through three points Q1, Q2, and Q3. The arc C2 will be described later.
- a point near the point Q3 on the image side surface of the second lens L2 is set as X4, and an intersection point between the normal line and the optical axis at the point is set as P4.
- the shape of the second lens L2 at the point X4 is defined by whether the point P4 is on the object side or the image side with respect to the point Q3.
- a point P4 is defined as a convex shape on the object side from the point Q3, and a case where the point P4 is located on the image side from the point Q3 is defined as a concave shape on the image side.
- the image side surface is convex toward the image side in the vicinity of the optical axis means a shape in which the point P4 is closer to the object side than the point Q3 in the vicinity of the optical axis.
- the second lens L2 has an image-side surface convex toward the image side in the vicinity of the optical axis and has a negative power, so that the axial ray passes through the image-side surface of the second lens L2. Since the incident angle at that time can be kept small, the spherical aberration can be corrected well.
- the third lens L3, the fourth lens L4, and the fifth lens L5 are configured to have positive, positive, and negative powers, respectively.
- the imaging lens according to the first embodiment is configured to satisfy the following conditional expression (2-1).
- L Distance on the optical axis from the object side surface of the first lens L1 to the image plane (the air conversion distance between the fifth lens L5 and the image plane)
- d1-4 Distance on the optical axis from the object side surface of the first lens L1 to the image plane (the air conversion distance between the fifth lens L5 and the image plane)
- the power and shape of each of the first lens L1 to the fifth lens L5 are suitably set as described above, and the aperture stop St is set to the first.
- the aperture stop St is set to the first.
- the imaging lens according to the second embodiment of the present invention includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 in order from the object side along the optical axis Z.
- This is a five-lens lens system in which a fifth lens L5 is arranged.
- An aperture stop St is disposed between the third lens L3 and the fourth lens L4. By arranging the aperture stop St between the third lens L3 and the fourth lens L4, it is possible to reduce the size in the radial direction.
- the first lens L1 has a negative power and is configured to be a meniscus lens having a convex object-side surface.
- the first lens L1 having negative power and a meniscus lens having a convex surface on the object side is advantageous for widening the angle and correcting distortion.
- the first lens L1 disposed closest to the object side is assumed to be exposed to wind and rain or a cleaning solvent.
- the object side surface of the first lens L1 is a convex surface, there is a concern in these situations. There is also an advantage that dust, dust, water droplets, and the like hardly remain.
- All of the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 have an aspherical shape on at least one surface.
- the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are preferably aspheric on both surfaces.
- the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are configured to have negative, positive, positive, and negative powers, respectively.
- the imaging lens according to the second embodiment is configured to satisfy the following conditional expression (2-2).
- L Distance on the optical axis from the object side surface of the first lens L1 to the image plane (the air conversion distance between the fifth lens L5 and the image plane)
- d1-4 Distance on the optical axis from the object side surface of the first lens L1 to the image side surface of the second lens L2 is below the lower limit of the conditional expression (2-2) on the optical axis, the first lens L1 and the second lens The lens L2 is close to the periphery and cannot be properly arranged.
- the power and shape of each of the first lens L1 to the fifth lens L5 are suitably set as described above, and the aperture stop St is set to the first.
- the aperture stop St is set to the first.
- the Abbe number with respect to the line is preferably 40 or more for the first lens L1, 50 or more for the second lens L2, 30 or less for the third lens L3, 50 or more for the fourth lens L4, and 30 or less for the fifth lens L5. .
- the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 have negative, negative, positive, positive, and negative power near the optical axis, respectively.
- the distance between the fourth lens L4 and the fifth lens L5 is small, and the distance does not change so much from the center part to the peripheral part of the lens. Further, it is preferable that the thickness of the fifth lens L5 does not change so much between the central portion and the peripheral portion. Thereby, the light beam passes through the image side surface of the fourth lens L4, the object side surface of the fifth lens L5, and the image side surface of the fifth lens L5 at almost the same angle for any angle of view. Therefore, it is possible to prevent abrupt aberrations due to manufacturing errors or the like.
- the imaging lens according to the present embodiment preferably further has a configuration described below.
- d4-5 the distance on the optical axis from the image side surface of the second lens L2 to the object side surface of the third lens L3
- f the second value when the value falls below the lower limit of the focal length conditional expression (7) of the entire system
- r10 When the upper limit of the curvature radius conditional expression (11) near the optical axis of the object side surface of the fifth lens L5 is exceeded, the absolute value of the curvature radius near the optical axis of the object side surface of the fifth lens L5 becomes too small. It becomes difficult to correct spherical aberration well.
- the radius of curvature of the object side surface of the fifth lens L5 is set to an appropriate value so that desired optical performance can be obtained, and if the upper limit of the conditional expression (11) is exceeded, the focal length increases and the required image becomes larger. The corner cannot be secured.
- r8 radius of curvature near the optical axis of the object side surface of the fourth lens L4
- r9 fourth lens L4 when the upper limit of the curvature radius conditional expression (13) near the optical axis of the image side surface of the fourth lens L4 is exceeded
- the absolute value of the radius of curvature is too small when the object side surface of L4 is in the vicinity of the optical axis, or the absolute value of the radius of curvature is too small when the image side surface of the fourth lens L4 is near the optical axis. It will be difficult to correct it.
- conditional expressions (7-1) to (13-1) are satisfied.
- conditional expressions (7-1) to (13-1) the same effects as those obtained by satisfying conditional expressions (7) to (13) can be obtained, or the effects can be reduced. It can be further increased.
- conditional expression (10-1) If the upper limit of conditional expression (10-1) is exceeded, a sufficient distance can be obtained from the lens to the image plane, but the distance from the object-side surface of the first lens L1 to the image plane increases, and this embodiment is performed.
- the imaging device such as a camera to which the imaging lens of the embodiment and the imaging lens of the present embodiment are applied is increased in size.
- the gap between the fourth lens L4 and the fifth lens L5 tends to increase as the distance from the optical axis increases, and the light beam that passes through the fifth lens L5 increases. Since the outer diameter of the fifth lens L5 increases, the degree of freedom of the lens barrel shape of the imaging lens of the present embodiment decreases.
- conditional expression (12-1) If the upper limit of conditional expression (12-1) is exceeded, the distance from the object-side surface of the first lens L1 to the image plane increases, and the imaging lens of the present embodiment and the camera to which the imaging lens of the present embodiment is applied. The imaging device becomes larger.
- the second lens L2 the third lens L3, the fourth lens L4, and the fifth lens L5, the effective diameter outermost two points and the optical axis on each of the object side surface and the image side surface in the cross section including the optical axis.
- the second lens L2 The side surface is concave on the image side and has negative power
- the third lens L3 is convex on the object side and has positive power
- the fourth lens L4 is on the image side.
- f34 Composite paraxial focal length L of the third lens L3 and the fourth lens L4 L: Distance on the optical axis from the object side surface of the first lens L1 to the image plane (the distance between the fifth lens L5 and the image plane is Air equivalent distance)
- d1-4 Distance on the optical axis from the object side surface of the first lens L1 to the image side surface of the second lens L2
- d3-11 Image of the fifth lens L5 from the object side surface of the second lens L2
- Distance on the optical axis to the side surface d4-5 Distance on the optical axis from the image side surface of the second lens L2 to the object side surface of the third lens L3 d6-8
- the image side surface is concave on the image side is defined by an arc C2 on the image side surface of the second lens L2 that passes through three points Q1, Q2, and Q3.
- the arc C2 has a concave shape on the image side, that is, a shape in which the point Q3 is closer to the object side than the points Q1 and Q2.
- having negative power means that the power of a lens having an overall shape assumed on the object side and the image side is negative.
- the shape of the object side surface of the third lens L3 when it is assumed to have the overall shape can be considered in the same manner as the description of the second lens L2. That is, “the object-side surface is convex on the object side” means that the object-side surface of the third lens L3 has two points Q11, Q12 at the outermost effective diameter on the object side of the third lens L3, and When assuming that the third lens L3 has a lens surface defined by an arc C3 passing through three points Q13 on the optical axis on the object side surface of the third lens L3, the arc C3 has a convex shape on the object side. It means a shape in which the point Q13 is closer to the object side than the points Q11 and Q12. Further, “having positive power” means that the power of a lens having an overall shape assumed on the object side and the image side is positive.
- the shape of the image-side surface of the fourth lens L4 when it is assumed to have the overall shape can be considered in the same manner as described for the second lens L2. That is, “the image-side surface is convex on the image side” means that the image-side surface of the fourth lens L4 has two points Q21 and Q22 at the outermost effective diameter on the image side of the fourth lens L4.
- the lens surface is defined by an arc C4 passing through three points Q23 on the optical axis on the image side surface of the fourth lens L4
- the arc C4 has a convex shape on the image side. It means a shape in which the point Q23 is closer to the image side than the points Q21 and Q22.
- “having positive power” means that the power of a lens having an overall shape assumed on the object side and the image side is positive.
- the shape of the image-side surface of the fifth lens L5 when it is assumed to have the overall shape can be considered in the same manner as described for the second lens L2. That is, “a meniscus shape with a convex surface facing the image side” means that the image side surface of the fifth lens L5 has two points Q31 and Q32 at the outermost effective diameter on the image side of the fifth lens L5 and the fifth lens.
- the lens surface is defined by an arc C5 passing through three points Q33 on the optical axis on the image side surface of L5
- the arc C5 has a meniscus shape convex to the image side, that is, a point Q33 means a meniscus shape that is closer to the image side than the points Q31 and Q32.
- “having negative power” means that the power of a lens having an overall shape assumed on the object side and the image side is negative.
- conditional expression (1) If the lower limit of conditional expression (1) is not reached, the absolute values of the powers of the third lens L3 and the fourth lens L4 become large, and manufacturing errors and positional accuracy of each lens are required to be highly demanded. Worsens and increases costs. If the upper limit of conditional expression (1) is exceeded, the power in the entire lens system will be insufficient, and the required angle of view will not be obtained.
- conditional expression (2) If the lower limit of conditional expression (2) is not reached, the first lens L1 and the second lens L2 are close to each other in the peripheral portion and cannot be properly arranged.
- the upper limit of conditional expression (2) is exceeded, the effective diameter of the first lens L1 increases, and the overall length and outer diameter of the entire lens system increase.
- the thickness of the second to fifth lenses L2 to L5 and the interval between the second to fifth lenses L2 to L5 must be reduced, and the manufacturability of each lens is reduced. It becomes worse or the power of each lens cannot be set appropriately, and it becomes difficult to correct chromatic aberration well. If the upper limit of conditional expression (3) is exceeded, the objective of lens miniaturization cannot be achieved, and the lens becomes large.
- conditional expression (4) If the lower limit of conditional expression (4) is not reached, there is an increased risk that the second lens L2 and the third lens L3 are too close to contact each other, and the image side surface of the second lens L2 and the object side of the third lens L3. It is difficult to remove ghost light that involves both of the surfaces. If the upper limit of conditional expression (5) is exceeded, it will be difficult to reduce the overall length of the lens.
- conditional expression (5) If the lower limit of conditional expression (5) is not reached, the third lens L3 and the fourth lens L4 are too close to each other, and it is difficult to form the aperture stop St therebetween. If the upper limit of conditional expression (5) is exceeded, it will be difficult to reduce the overall length of the lens.
- conditional expression (6) If the upper limit of conditional expression (6) is exceeded, it will be difficult to satisfactorily correct spherical aberration.
- the thickness of the fifth lens L5 becomes too small, making it difficult to manufacture. If the upper limit of conditional expression (8-2) is exceeded, the thickness of the fifth lens L5 becomes too large and the lens becomes large. Further, if it is attempted to reduce the distance from the object-side surface of the first lens L1 to the image plane, it is difficult to ensure the necessary back focus.
- conditional expressions (7-3) and (8-3) are satisfied.
- conditional expressions (7-3) and (8-3) the effect obtained by satisfying conditional expressions (7-2) and (8-2) can be further enhanced.
- conditional expressions (9-3) and (10-3) are satisfied.
- conditional expressions (9-3) and (10-3) the effect obtained by satisfying conditional expressions (9-2) and (10-2) can be further enhanced.
- the radius of curvature of the object side surface of the fifth lens L5 is set to an appropriate value so as to obtain the desired optical performance, if the upper limit of the conditional expression (11-2) is exceeded, the focal length becomes large and necessary. A correct angle of view cannot be secured.
- the focal length becomes long when the distance on the optical axis from the object-side surface of the first lens L1 to the image plane is set to an appropriate dimension.
- the angle of view cannot be taken.
- the shape of the object-side surface of the second lens L2 can be considered similarly to the shape of the image-side surface of the second lens L2.
- the intersection point with the optical axis on the object side surface of the second lens L2 is Q13
- a point near the point Q13 is X3
- the intersection point between the normal line and the optical axis is P3.
- the shape of the second lens L2 at the point X3 is defined by whether the point P3 is on the object side or the image side with respect to the point Q13.
- the point P3 is defined as a concave shape on the object side from the point Q13
- the case where the point P3 is located on the image side from the point Q13 is defined as a convex shape on the object side.
- the object side surface in the vicinity of the optical axis has a concave shape on the object side means a shape in which the point P3 is closer to the object side than the point Q13 in the vicinity of the optical axis.
- the object-side surface is concave on the object side in the vicinity of the optical axis and has negative power, so that the axial ray passes through the image-side surface of the second lens L2. Since the incident angle at that time can be kept small, the spherical aberration can be corrected well.
- the focal length becomes longer when the distance on the optical axis from the object-side surface of the first lens L1 to the image plane is set to an appropriate dimension. The angle of view cannot be taken. If the upper limit of conditional expression (12-4) is exceeded, the distance from the object-side surface of the first lens L1 to the image plane when the required angle of view is secured becomes too large, and the imaging lens and book of the present embodiment An imaging apparatus such as a camera to which the imaging lens of the embodiment is applied is increased in size.
- conditional expressions (13-3) and (12-5) are further satisfied. It is more preferable to satisfy.
- conditional expressions (13-3) and (12-5) the effect obtained by satisfying conditional expressions (13-2) and (12-4) can be further enhanced.
- the imaging lens of the present embodiment preferably has a total angle of view larger than 200 degrees.
- the total angle of view is twice the angle formed by the principal ray of the off-axis light beam 3 and the optical axis Z at the maximum angle of view.
- the imaging lens of the present embodiment is preferably a single lens in which all of the first lens L1 to the fifth lens L5 are not cemented, as in the example shown in FIG.
- the first lens L1 disposed closest to the object side is subject to surface deterioration due to wind and rain, and temperature change due to direct sunlight.
- a material that is resistant to chemicals such as oils and fats and detergents, that is, a material having high water resistance, weather resistance, acid resistance, chemical resistance, and the like.
- a powder having a water resistance of 1 determined by the Japan Optical Glass Industry Association may be required to use a material that is hard and hard to break. By making the material glass, it is possible to satisfy the above requirements.
- transparent ceramics may be used as the material of the first lens L1.
- a protective means for enhancing strength, scratch resistance, and chemical resistance may be applied to the object side surface of the first lens L1, and in this case, the material of the first lens L1 may be plastic.
- Such protective means may be a hard coat or a water repellent coat.
- the material of the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 it is preferable to use plastic.
- an aspherical shape can be produced with high accuracy and light weight. And cost reduction.
- plastic When plastic is used as the material, it is preferable to select a material that has low water absorption and low birefringence that causes a decrease in resolution so that the performance change due to water absorption can be suppressed as much as possible. As materials satisfying this condition, it is preferable to select a cycloolefin plastic for the second lens L2 and the fourth lens L4, and a polycarbonate plastic or a polyester plastic for the third lens L3 and the fifth lens L5. .
- plastic is used as the material of at least one of the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5, a so-called plastic material in which particles smaller than the wavelength of light are mixed is used.
- Nanocomposite materials may be used.
- an antireflection film may be applied to each lens in order to reduce ghost light or the like.
- an antireflection film in which the wavelength at which the reflectance near the center is minimum is 600 nm or more and 900 nm or less is applied to one or more of the three surfaces including the image side surface of the first lens L1.
- the reflectance can be reduced on average over the entire effective diameter, and ghost light can be reduced.
- the wavelength at which the reflectance near the center becomes the smallest is shorter than 600 nm, the wavelength at which the reflectance at the peripheral portion becomes the smallest becomes too short, and the reflectance on the long wavelength side becomes high. ghosts are likely to occur.
- the wavelength at which the reflectance near the center is the smallest is longer than 900 nm, the wavelength at which the reflectance at the center becomes the smallest becomes too long, and the reflectance on the short wavelength side becomes high. It will be very reddish and will tend to produce a bluish ghost.
- the light flux that passes outside the effective diameter between the lenses becomes stray light and reaches the image plane, and may become a ghost.
- a light shielding means for example, an opaque paint may be applied to a portion outside the effective diameter on the image side of the lens, or an opaque plate material may be provided.
- an opaque plate material may be provided in the optical path of a light beam that becomes stray light to serve as a light shielding unit.
- a filter that cuts blue light from ultraviolet light or an IR (InfraRed) cut filter that cuts infrared light is inserted between the lens system and the imaging device 5. May be.
- a coating having the same characteristics as the filter may be applied to the lens surface.
- FIG. 1 shows an example in which the optical member PP assuming various filters is arranged between the lens system and the image sensor 5, these various filters may be arranged between the lenses instead.
- the lens sectional views of the imaging lenses of Examples 1 to 8 are those shown in FIGS. 1 to 8, respectively.
- Table 1 shows lens data and aspherical data of the imaging lens of Example 1. Similarly, lens data and aspheric surface data of the imaging lenses of Examples 2 to 8 are shown in Tables 2 to 8, respectively. In the following, the meaning of the symbols in the table will be described using Example 1 as an example, but the same applies to Examples 2 to 8.
- the ri column indicates the radius of curvature of the i-th surface
- the di column indicates the surface spacing on the optical axis Z between the i-th surface and the i + 1-th surface.
- the sign of the radius of curvature is positive when convex on the object side and negative when convex on the image side.
- ri and di (i 1, 2, 3,...)
- In the lens data table correspond to the symbols ri and di in the lens sectional view.
- the column of ⁇ dj indicates the Abbe number of the j-th optical element with respect to the d-line (wavelength: 587.6 nm).
- the lens data also includes the aperture stop St, and ⁇ is written in the column of the radius of curvature of the surface corresponding to the aperture stop St.
- the optical member PP disposed between the fifth lens L5 and the image plane Sim in FIGS. 1 to 8 assumes a cover glass, a filter, and the like.
- the refractive index is A 1.52 glass material is used, and its thickness is 0.3 mm.
- the numerical value of the radius of curvature near the optical axis is shown as the radius of curvature of the aspheric surface.
- the aspheric data shows the surface number of the aspheric surface and the aspheric coefficient for each aspheric surface.
- the numerical value “E ⁇ n” (n: integer) of the aspheric surface data means “ ⁇ 10 ⁇ n ”, and “E + n” means “ ⁇ 10 n ”.
- Zd C ⁇ h 2 / ⁇ 1+ (1 ⁇ K ⁇ C 2 ⁇ h 2 ) 1/2 ⁇ + ⁇ am ⁇ h m
- Zd Depth of aspheric surface (length of a perpendicular line drawn from a point on the aspherical surface at height h to a plane perpendicular to the optical axis where the aspherical vertex contacts)
- h Height (distance from the optical axis to the lens surface)
- C paraxial curvature K
- the first lens L1 is made of optical glass and has a spherical shape on both sides, so that it is possible to obtain good weather resistance and resistance to scratches caused by earth and sand, and to be manufactured at a relatively low cost. can do.
- the second lens L2 and the fourth lens L4 in Examples 1 to 8 are made of a cycloolefin plastic, and the third lens L3 and the fifth lens L5 are made of a polycarbonate plastic to change the performance due to water absorption. A material with low water absorption is selected so as to suppress it as much as possible.
- Table 9 shows various data in the imaging lenses of Examples 1 to 8 and values corresponding to the conditional expressions (1) to (13).
- the e-line is used as a reference wavelength
- Table 9 shows values at this reference wavelength.
- f is the focal length of the entire system
- Bf is the distance on the optical axis from the image side surface of the lens closest to the image side to the image plane (corresponding to back focus)
- L is the object side of the first lens L1.
- the distance 2 ⁇ on the optical axis from the image plane to the image plane Sim is the total angle of view.
- Bf is the air conversion length, that is, a value calculated by converting the thickness of the optical member PP into air.
- an air equivalent length is used for the back focus of L.
- FIGS. 9A to 9D show spherical aberration, astigmatism, distortion (distortion aberration), and lateral chromatic aberration (chromatic aberration of magnification), respectively.
- FIGS. 9E to 9G show transverse aberration in the tangential direction at each half angle of view.
- Each aberration diagram shows the aberration with the e-line as the reference wavelength, but the spherical aberration diagram and the chromatic aberration diagram of the magnification also show the aberrations for the g-line (wavelength 436 nm) and C-line (wavelength 656.27 nm).
- Fno Of spherical aberration diagram. Means F number, and ⁇ in other aberration diagrams means half angle of view.
- FIGS. (A) to (G) the aberration diagrams of spherical aberration, astigmatism, distortion (distortion aberration), lateral chromatic aberration, and lateral aberration of the imaging lenses of Examples 2 to 8 are shown in FIGS. (A) to (G), FIGS. 12 (A) to (G), FIGS. 13 (A) to (G), FIGS. 14 (A) to (G), FIGS. 15 (A) to (G), FIG. Shown in A) to (G).
- the ideal image height is 2 ⁇ f ⁇ tan ( ⁇ / 2) using the focal length f of the entire system and the half angle of view ⁇ (variable treatment, 0 ⁇ ⁇ ⁇ ⁇ ). Since the amount of deviation is shown, it has a negative value at the periphery.
- the distortion of the imaging lenses of Examples 1 to 8 is a large positive value when calculated based on the image height based on equidistant projection. This is because the imaging lenses of Examples 1 to 8 are considered so that the peripheral image is larger than the lens designed to suppress distortion at an image height based on equidistant projection. is there.
- the imaging lenses of Examples 1 to 8 have a very wide full angle of view of about 220 degrees in addition to reducing the size and cost with a lens configuration as small as five. , A small F number of 2.0, and high optical performance with high resolution with each aberration corrected well.
- These imaging lenses can be suitably used for surveillance cameras, in-vehicle cameras for taking images of the front, side, rear, etc. of automobiles.
- FIG. 17 shows a state in which an imaging apparatus including the imaging lens of the present embodiment is mounted on the automobile 100.
- an automobile 100 includes an outside camera 101 for imaging the blind spot range on the side surface on the passenger seat side, an outside camera 102 for imaging the blind spot range on the rear side of the automobile 100, and a rear surface of the rearview mirror.
- An in-vehicle camera 103 is attached and is used for photographing the same field of view as the driver.
- the vehicle exterior camera 101, the vehicle exterior camera 102, and the vehicle interior camera 103 are imaging devices according to embodiments of the present invention, and convert an imaging lens according to an embodiment of the present invention and an optical image formed by the imaging lens into an electrical signal.
- An image pickup device is an image pickup device.
- the exterior cameras 101 and 102 and the interior camera 103 can be configured to be small and inexpensive, have a wide angle of view, and have high resolution. Can get a good picture.
- the present invention has been described with reference to the embodiments and examples.
- the present invention is not limited to the above embodiments and examples, and various modifications can be made.
- the values of the radius of curvature, the surface interval, the refractive index, the Abbe number, and the aspheric coefficient of each lens component are not limited to the values shown in the above numerical examples, and can take other values.
- the material of the lens is not limited to that used in each of the above numerical examples, and another material may be used.
- the present invention is not limited to this application, and for example, a mobile terminal camera or a surveillance camera The present invention can also be applied.
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Abstract
Description
物体側に凸面を向けたメニスカス形状であるとともに、負のパワーを持つ第1レンズと、
光軸近傍において像側の面が像側に凸形状であるとともに、負のパワーを持つ第2レンズと、
正のパワーを持つ第3レンズと、
絞りと、
正のパワーを持つ第4レンズと、
負のパワーを持つ第5レンズとの実質的に5枚のレンズからなり、
前記第1レンズから前記第5レンズのレンズ面のうち、少なくとも一面が非球面であり、
下記条件式(2-1)を満足することを特徴とするものである。
ただし、
L:前記第1レンズの物体側の面から像面までの光軸上の距離(前記第5レンズと像面の間は空気換算距離)
d1-4:前記第1レンズの物体側の面から前記第2レンズの像側の面までの光軸上の距離
本発明による第2の撮像レンズは、物体側から順に、
物体側に凸面を向けたメニスカス形状であるとともに、負のパワーを持つ第1レンズと、
負のパワーを持つ第2レンズと、
正のパワーを持つ第3レンズと、
絞りと、
正のパワーを持つ第4レンズと、
負のパワーを持つ第5レンズとの実質的に5枚のレンズからなり、
前記第1レンズから前記第5レンズのレンズ面のうち、少なくとも一面が非球面であり、
下記条件式(2-2)を満足することを特徴とするものである。
ただし、
L:前記第1レンズの物体側の面から像面までの光軸上の距離(前記第5レンズと像面の間は空気換算距離)
d1-4:前記第1レンズの物体側の面から前記第2レンズの像側の面までの光軸上の距離
第1レンズに関する「物体側に凸面を向けたメニスカス形状であるとともに、負のパワーを持つ」とは、第1レンズが非球面を有する場合は、近軸領域で考えるものとする。
0.40<d1-4/L<0.50 … (2)
0.45<d3-11/L<0.54 … (3)
0.02<d4-5/L<0.05 … (4)
0.012<d6-8/L<0.04 … (5)
L/r3<-6.0 … (6)
0.08<d4-5/f … (7)
0.04<d10/f … (8)
0.48<f3/f … (9)
0.71<Bf/f … (10)
r10/f<-0.25 … (11)
1.2<L/f … (12)
(r8+r9)/(r8-r9)<2.9 … (13)
ただし、
f34:第3レンズと第4レンズとの合成近軸焦点距離
L:第1レンズの物体側の面から像面までの光軸上の距離(レンズと像面の間は空気換算距離)
d1-4:第1レンズの物体側の面から第2レンズの像側の面までの光軸上の距離
d3-11:第2レンズの物体側の面から第5レンズの像側の面までの光軸上の距離
d4-5:第2レンズの像側の面から第3レンズの物体側の面までの光軸上の距離
d6-8:第3レンズの像側の面から第4レンズの物体側の面までの光軸上の距離
r3:第2のレンズの物体側の面の光軸近傍の曲率半径
f:全系の焦点距離
d10:第5レンズの光軸上の厚さ
f3:第3レンズの焦点距離
Bf:全系のバックフォーカス
r10:第5レンズの物体側の面の光軸近傍の曲率半径
r8:第4レンズの物体側の面の光軸近傍の曲率半径
r9:第4レンズの像側の面の光軸近傍の曲率半径
0.20<d10/f<0.80 … (8-1)
2.0<f3/f<20.0 … (9-1)
1.5<Bf/f<3.0 … (10-1)
-5.0<r10/f<-0.50 … (11-1)
5.0<L/f<20.0 … (12-1)
(r8+r9)/(r8-r9)<2.0 … (13-1)
本発明の撮像装置は、上記記載の本発明の撮像レンズを備えたことを特徴とするものである。
ただし、
L:第1レンズL1の物体側の面から像面までの光軸上の距離(第5レンズL5と像面の間は空気換算距離)
d1-4:第1レンズL1の物体側の面から第2レンズL2の像側の面までの光軸上の距離
条件式(2-1)の下限を下回ると、第1レンズL1と第2レンズL2とが周辺部で近接して、適正に配置できなくなる。
ただし、
L:第1レンズL1の物体側の面から像面までの光軸上の距離(第5レンズL5と像面の間は空気換算距離)
d1-4:第1レンズL1の物体側の面から第2レンズL2の像側の面までの光軸上の距離
条件式(2-2)の下限を下回ると、第1レンズL1と第2レンズL2とが周辺部で近接して、適正に配置できなくなる。
ただし、
d4-5:第2レンズL2の像側の面から第3レンズL3の物体側の面までの光軸上の距離
f:全系の焦点距離
条件式(7)の下限を下回ると、第2レンズL2と第3レンズL3とが近接し過ぎて接触する危険性が増し、第2レンズL2の像側の面および第3レンズL3の物体側の面の双方が関与するゴースト光を除去し難くなる。
ただし、
d10:第5レンズL5の光軸上の厚さ
条件式(8)の下限を下回ると、第5レンズL5の厚さが小さくなり過ぎ、製造が困難となる。
ただし、
f3:第3レンズL3の焦点距離
条件式(9)の下限を下回ると、第3レンズL3のパワーが強くなり過ぎ、形状誤差や偏心による収差変化の感度が高くなり、形状や組立に高い精度が必要になる。
ただし、
Bf:全系のバックフォーカス
条件式(10)の下限を下回ると、第5レンズL5の像側の面と像面とが近づき過ぎ、レンズの傷等の欠陥が画像に与える影響が大きくなり、またレンズを適正に配置することが困難となる。
ただし、
r10:第5レンズL5の物体側の面の光軸近傍の曲率半径
条件式(11)の上限を上回ると、第5レンズL5の物体側面の光軸近傍の曲率半径の絶対値が小さくなり過ぎ、球面収差を良好に補正することが困難となる。または第5レンズL5の物体側の面の曲率半径を、所望の光学性能が得られるように適正値にした場合に条件式(11)の上限を上回ると、焦点距離が大きくなり、必要な画角が確保できなくなる。
条件式(12)の下限を下回ると、第1レンズL1の物体側の面から像面までの光軸上の距離を適正な寸法に設定したときに、焦点距離が長くなるため、大きな画角がとれなくなる。
ただし、
r8:第4レンズL4の物体側の面の光軸近傍の曲率半径
r9:第4レンズL4の像側の面の光軸近傍の曲率半径
条件式(13)の上限を上回ると、第4レンズL4の物体側の面が光軸近傍で曲率半径の絶対値が小さくなり過ぎるか、第4レンズL4の像側の面が光軸近傍で曲率半径の絶対値が小さくなり過ぎ、球面収差を良好に補正することが困難となる。
0.20<d10/f<0.80 … (8-1)
2.0<f3/f<20.0 … (9-1)
1.5<Bf/f<3.0 … (10-1)
-5.0<r10/f<-0.50 … (11-1)
5.0<L/f<20.0 … (12-1)
(r8+r9)/(r8-r9)<2.0 … (13-1)
条件式(7-1)の上限を上回ると、レンズ全長を極力短くする場合に不利となる。
0.40<d1-4/L<0.50 … (2)
0.45<d3-11/L<0.54 … (3)
0.02<d4-5/L<0.05 … (4)
0.012<d6-8/L<0.04 … (5)
L/r3<-6.0 … (6)
ただし、
f34:第3レンズL3と第4レンズL4との合成近軸焦点距離
L:第1レンズL1の物体側の面から像面までの光軸上の距離(第5レンズL5と像面の間は空気換算距離)
d1-4:第1レンズL1の物体側の面から第2レンズL2の像側の面までの光軸上の距離
d3-11:第2レンズL2の物体側の面から第5レンズL5の像側の面までの光軸上の距離
d4-5:第2レンズL2の像側の面から第3レンズL3の物体側の面までの光軸上の距離
d6-8:第3レンズL3の像側の面から第4レンズL4の物体側の面までの光軸上の距離
r3:第2のレンズL2の物体側の面の光軸近傍の曲率半径
ここで、上記全体形状を有するものと想定した場合における第2レンズL2の像側の面の形状について、図1を参照しながら説明する。上述したように、円弧C2は、3つの点Q1,Q2,Q3を通る円弧である。
条件式(2-3)の下限を下回ると、第1レンズL1と第2レンズL2とが周辺部で近接して、適正に配置できなくなる。条件式(2-3)の上限を上回ると、第1レンズL1の有効径が大きくなり、レンズ全系の全長および外径が大型化してしまう。
0.08<d10/f<0.54 … (8-2)
条件式(7-2)の上限を上回ると、第2レンズL2と第3レンズL3とが離れ過ぎ、レンズ全体が大型化する。また、コマ収差の補正が困難となる。
0.46<d10/f<0.54 … (8-3)
条件式(7-3)の下限を下回ると、第2レンズL2と第3レンズL3とが近接し過ぎて接触する危険性が増し、面r4,r5の双方が関与するゴースト光を除去し難くなる。
1.84<Bf/f … (10-2)
条件式(9-2)の下限を下回ると、第3レンズL3のパワーが強くなり過ぎ、形状誤差や偏心による収差変化の感度が高くなり、形状や組立に高い精度が必要になる。
1.77<Bf/f<2.3 … (10-3)
条件式(9-3)の上限を上回ると、第3レンズL3のパワーが弱くなり過ぎて、倍率色収差の補正が不十分になる。条件式(10-3)の上限を上回ると、レンズから像面までは十分な距離をとることができるが、第1レンズL1の物体側の面から像面までの距離が大きくなり、本実施形態の撮像レンズおよび本実施形態の撮像レンズを適用したカメラ等の撮像装置が大型化する。
11.9<L/f … (12-2)
条件式(11-2)の下限を下回ると、画角に必要な焦点距離を適正にした場合に、第5レンズL5の物体側面の光軸近傍の曲率半径が大きくなり、球面収差の補正効果が小さくなる。条件式(11-2)の上限を上回ると、第5レンズL5の物体側面の光軸近傍の曲率半径の絶対値が小さくなり過ぎ、球面収差を良好に補正することが困難となる。または第5レンズL5の物体側の面の曲率半径を、所望の光学性能が得られるように適正値にした場合に条件式(11-2)の上限を上回ると、焦点距離が大きくなり、必要な画角が確保できなくなる。
条件式(12-3)の上限を上回ると、第1レンズL1の物体側の面から像面までの距離が大きくなり、本実施形態の撮像レンズが大型化するとともに、本実施形態の撮像レンズを適用したカメラ等の撮像装置が大型化する。
1.6<L/f<15.7 … (12-4)
ここで、第2レンズL2の物体側の面の形状は、第2レンズL2の像側の面の形状と同様に考えることができる。図1において、第2レンズL2の物体側の面上の光軸との交点をQ13とし、点Q13近傍のある点をX3として、その点での法線と光軸との交点をP3とする。このとき点X3での第2レンズL2の形状は点P3が点Q13を基準として物体側、像側のいずれの側にあるかで定義する。物体側の面においては点P3が点Q13より物体側にある場合を物体側に凹形状、点P3が点Q13より像側にある場合を物体側に凸形状と定義する。
5.0<L/f<20.0 … (12-5)
本実施形態の撮像レンズは、全画角が200度より大きいことが好ましい。全画角は、最大画角での軸外光束3の主光線と光軸Zとのなす角の2倍である。全画角が200度より大きな広角のレンズ系とすることで、近年の広角化の要望に対応可能となる。
ただし、
Zd:非球面深さ(高さhの非球面上の点から、非球面頂点が接する光軸に垂直な平面に下ろした垂線の長さ)
h:高さ(光軸からのレンズ面までの距離)
C:近軸曲率
K、am:非球面係数(m=3、4、5、…20)
Claims (19)
- 物体側から順に、
物体側に凸面を向けたメニスカス形状であるとともに、負のパワーを持つ第1レンズと、
光軸近傍において像側の面が像側に凸形状であるとともに、負のパワーを持つ第2レンズと、
正のパワーを持つ第3レンズと、
絞りと、
正のパワーを持つ第4レンズと、
負のパワーを持つ第5レンズとの実質的に5枚のレンズからなり、
前記第1レンズから前記第5レンズのレンズ面のうち、少なくとも一面が非球面であり、
下記条件式(2-1)を満足することを特徴とする撮像レンズ。
0.11<d1-4/L … (2-1)
ただし、
L:前記第1レンズの物体側の面から像面までの光軸上の距離(前記第5レンズと像面の間は空気換算距離)
d1-4:前記第1レンズの物体側の面から前記第2レンズの像側の面までの光軸上の距離 - 下記条件式(2-3)を満足することを特徴とする請求項1記載の撮像レンズ。
0.40<d1-4/L<0.60 … (2-3)
ただし、
L:前記第1レンズの物体側の面から像面までの光軸上の距離(前記第5レンズと像面の間は空気換算距離)
d1-4:前記第1レンズの物体側の面から前記第2レンズの像側の面までの光軸上の距離 - 物体側から順に、
物体側に凸面を向けたメニスカス形状であるとともに、負のパワーを持つ第1レンズと、
負のパワーを持つ第2レンズと、
正のパワーを持つ第3レンズと、
絞りと、
正のパワーを持つ第4レンズと、
負のパワーを持つ第5レンズとの実質的に5枚のレンズからなり、
前記第1レンズから前記第5レンズのレンズ面のうち、少なくとも一面が非球面であり、
下記条件式(2-2)を満足することを特徴とする撮像レンズ。
0.40<d1-4/L … (2-2)
ただし、
L:前記第1レンズの物体側の面から像面までの光軸上の距離(前記第5レンズと像面の間は空気換算距離)
d1-4:前記第1レンズの物体側の面から前記第2レンズの像側の面までの光軸上の距離 - 下記条件式(2-3)を満足することを特徴とする請求項3記載の撮像レンズ。
0.40<d1-4/L<0.60 … (2-3)
ただし、
L:前記第1レンズの物体側の面から像面までの光軸上の距離(前記第5レンズと像面の間は空気換算距離)
d1-4:前記第1レンズの物体側の面から前記第2レンズの像側の面までの光軸上の距離 - 下記条件式(7)を満足することを特徴とする請求項1から4のいずれか1項記載の撮像レンズ。
0.08<d4-5/f … (7)
ただし、
d4-5:前記第2レンズの像側の面から前記第3レンズの物体側の面までの光軸上の距離
f:全系の焦点距離 - 下記条件式(7-1)を満足することを特徴とする請求項5項記載の撮像レンズ。
0.20<d4-5/f<0.60 … (7-1)
ただし、
d4-5:前記第2レンズの像側の面から前記第3レンズの物体側の面までの光軸上の距離
f:全系の焦点距離 - 下記条件式(8)を満足することを特徴とする請求項1から6のいずれか1項記載の撮像レンズ。
0.04<d10/f … (8)
ただし、
d10:前記第5レンズの光軸上の厚さ - 下記条件式(8-1)を満足することを特徴とする請求項7記載の撮像レンズ。
0.20<d10/f<0.80 … (8-1)
ただし、
d10:前記第5レンズの光軸上の厚さ - 下記条件式(9)を満足することを特徴とする請求項1から8のいずれか1項記載の撮像レンズ。
0.48<f3/f … (9)
ただし、
f3:前記第3レンズの焦点距離 - 下記条件式(9-1)を満足することを特徴とする請求項9記載の撮像レンズ。
2.0<f3/f<20.0 … (9-1)
ただし、
f3:前記第3レンズの焦点距離 - 下記条件式(10)を満足することを特徴とする請求項1から10のいずれか1項記載の撮像レンズ。
0.71<Bf/f … (10)
ただし、
Bf:全系のバックフォーカス - 下記条件式(10-1)を満足することを特徴とする請求項11記載の撮像レンズ。
1.5<Bf/f<3.0 … (10-1)
ただし、
Bf:全系のバックフォーカス - 下記条件式(11)を満足することを特徴とする請求項1から12のいずれか1項記載の撮像レンズ。
r10/f<-0.25 … (11)
ただし、
r10:前記第5レンズ物体側の面の光軸近傍の曲率半径 - 下記条件式(11-1)を満足することを特徴とする請求項13記載の撮像レンズ。
-5.0<r10/f<-0.50 … (11-1)
ただし、
r10:前記第5レンズ物体側の面の光軸近傍の曲率半径 - 下記条件式(12)を満足することを特徴とする請求項1から14のいずれか1項記載の撮像レンズ。
1.2<L/f … (12) - 下記条件式(12-1)を満足することを特徴とする請求項15記載の撮像レンズ。
5.0<L/f<20.0 … (12-1) - 下記条件式(13)を満足することを特徴とする請求項1から16のいずれか1項記載の撮像レンズ。
(r8+r9)/(r8-r9)<2.9 … (13)
ただし、
r8:前記第4レンズの物体側の面の光軸近傍の曲率半径
r9:前記第4レンズの像側の面の光軸近傍の曲率半径 - 下記条件式(13-1)を満足することを特徴とする請求項17記載の撮像レンズ。
(r8+r9)/(r8-r9)<2.0 … (13-1)
ただし、
r8:前記第4レンズの物体側の面の光軸近傍の曲率半径
r9:前記第4レンズの像側の面の光軸近傍の曲率半径 - 請求項1から18のいずれか1項記載の撮像レンズを搭載したことを特徴とする撮像装置。
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EP12802293.6A EP2725405B1 (en) | 2011-06-22 | 2012-06-19 | Imaging lens and imaging device |
CN201290000625.2U CN203773130U (zh) | 2011-06-22 | 2012-06-19 | 成像镜头和成像设备 |
JP2013521448A JP5834080B2 (ja) | 2011-06-22 | 2012-06-19 | 撮像レンズおよび撮像装置 |
US14/109,110 US9036269B2 (en) | 2011-06-22 | 2013-12-17 | Imaging lens and imaging apparatus |
US14/684,457 US20150212299A1 (en) | 2011-06-22 | 2015-04-13 | Imaging lens |
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US14/109,110 Continuation US9036269B2 (en) | 2011-06-22 | 2013-12-17 | Imaging lens and imaging apparatus |
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US (2) | US9036269B2 (ja) |
EP (1) | EP2725405B1 (ja) |
JP (2) | JP5834080B2 (ja) |
CN (1) | CN203773130U (ja) |
WO (1) | WO2012176433A1 (ja) |
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JP2016029501A (ja) * | 2011-06-22 | 2016-03-03 | 富士フイルム株式会社 | 撮像レンズおよび撮像装置 |
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JP2014149481A (ja) | 2013-02-04 | 2014-08-21 | Fujifilm Corp | 内視鏡用対物レンズおよび内視鏡 |
TWI582480B (zh) * | 2015-06-18 | 2017-05-11 | Quick dew dissipation of the lens module | |
JP2017068164A (ja) * | 2015-10-01 | 2017-04-06 | オリンパス株式会社 | 広角光学系及びそれを備えた撮像装置 |
TWI566003B (zh) | 2015-10-12 | 2017-01-11 | 大立光電股份有限公司 | 攝影用光學鏡片組、取像裝置及電子裝置 |
TWI606282B (zh) | 2016-11-24 | 2017-11-21 | 大立光電股份有限公司 | 光學攝影系統鏡組、取像裝置及電子裝置 |
JP6664853B2 (ja) | 2017-06-15 | 2020-03-13 | カンタツ株式会社 | 撮像レンズ |
CN107167898B (zh) * | 2017-06-29 | 2023-05-02 | 江西联创电子有限公司 | 鱼眼镜头 |
DE102020115494B3 (de) | 2020-05-19 | 2021-04-22 | Jenoptik Optical Systems Gmbh | Objektiv, Verwendung eınes Objektivs, Messsystem mit einem Objektiv sowie Verwendung einer biasphärischen Kunststofflinse in einem Objektiv |
TWI811987B (zh) * | 2022-01-28 | 2023-08-11 | 揚明光學股份有限公司 | 光學鏡頭 |
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JP2016029501A (ja) | 2016-03-03 |
US20150212299A1 (en) | 2015-07-30 |
EP2725405B1 (en) | 2016-07-27 |
EP2725405A1 (en) | 2014-04-30 |
JPWO2012176433A1 (ja) | 2015-02-23 |
US9036269B2 (en) | 2015-05-19 |
EP2725405A4 (en) | 2014-11-12 |
JP5834080B2 (ja) | 2015-12-16 |
CN203773130U (zh) | 2014-08-13 |
US20140104702A1 (en) | 2014-04-17 |
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