WO2009116492A1 - 撮像レンズ、撮像装置、デジタル機器、及び撮像レンズの製造方法 - Google Patents
撮像レンズ、撮像装置、デジタル機器、及び撮像レンズの製造方法 Download PDFInfo
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- WO2009116492A1 WO2009116492A1 PCT/JP2009/055046 JP2009055046W WO2009116492A1 WO 2009116492 A1 WO2009116492 A1 WO 2009116492A1 JP 2009055046 W JP2009055046 W JP 2009055046W WO 2009116492 A1 WO2009116492 A1 WO 2009116492A1
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- lens
- imaging
- refractive index
- resin material
- imaging lens
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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
- G02B13/0025—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 one lens only
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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
- G02B13/0035—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 three lenses
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
- Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
Definitions
- the present invention relates to an imaging lens of an imaging device using a solid-state imaging device such as a CCD (Charge Coupled Devices) type image sensor or a CMOS (Complementary Metal-Oxide Semiconductor) type image sensor, and more specifically for mass production.
- a solid-state imaging device such as a CCD (Charge Coupled Devices) type image sensor or a CMOS (Complementary Metal-Oxide Semiconductor) type image sensor, and more specifically for mass production.
- the present invention relates to an imaging lens in an optical system using a suitable wafer-scale lens, an imaging device using the imaging lens, a digital device, and a manufacturing method of the imaging lens.
- Compact and thin imaging devices (hereinafter also referred to as camera modules) are now mounted on portable terminals that are compact and thin electronic devices such as mobile phones and PDAs (Personal Digital Assistants). It is possible to transmit not only audio information but also image information to each other.
- portable terminals that are compact and thin electronic devices such as mobile phones and PDAs (Personal Digital Assistants). It is possible to transmit not only audio information but also image information to each other.
- a solid-state image pickup element such as a CCD type image sensor or a CMOS type image sensor is used.
- the number of pixels of an image sensor has been increased, and higher resolution and higher performance have been achieved.
- a lens for forming a subject image on these image sensors a lens made of a resin material that can be mass-produced at low cost has been used for cost reduction.
- a lens made of a resin material can accurately transfer and form a complicated aspherical shape despite having good processability, and therefore can be applied to a high-resolution and high-performance imaging device.
- an imaging lens used in the imaging apparatus an optical system constituted by a resin material lens and an optical system constituted by a glass lens and a resin material lens are conventionally well known.
- the conventional optical system is not sufficient particularly for use in an imaging device of a portable terminal, and there is a strong demand to achieve further ultra-compactness of these optical systems and mass productivity required for the portable terminal.
- Patent Document 1 and Patent Document 2 disclose an imaging lens including a lens portion on a lens substrate.
- a resin material used for a general optical element has a characteristic that when it is placed in a humid environment, it easily absorbs water as compared with a glass material, thereby causing a change in refractive index.
- a wafer scale lens is generally formed from an energy curable resin material such as a thermosetting resin material or a UV curable resin material.
- an energy curable resin material is also refracted by water absorption. Since the change in refractive index changes the power of the entire optical system due to such a change in refractive index, a change in the paraxial image point position (out of focus) occurs. Therefore, such a wafer scale lens is used as an imaging lens.
- the present invention has been made in view of such a situation, and ensures low-cost imaging lenses, imaging apparatuses, digital devices, which ensure mass productivity and prevent image quality degradation due to fluctuations in paraxial image point positions due to water absorption. And it aims at providing the manufacturing method of an imaging lens.
- the imaging lens according to claim 1 has at least one lens block in which a lens portion having a positive power is formed on at least one of an object side surface and an image side surface of a lens substrate that is a parallel plate.
- the lens portion is formed of an energy curable resin material that is different from the lens substrate, and at least one of the lens portions having a positive power has a dimensional change rate due to water absorption of the lens substrate. It is larger than the rate of dimensional change due to water absorption and satisfies the following conditional expression (1).
- dn is the difference between the refractive index dn1 measured for 3 days at 95 ° C. in an absolutely dry state at 95 ° C.
- absolute dry state means a state in which no moisture is contained in the atmosphere
- RH means relative humidity (relative humidity), which is a certain temperature (here, 60%). (° C.) divided by the amount of water vapor (mass absolute humidity) contained in the atmosphere by the amount of water vapor saturated at that temperature (mass absolute humidity) (unit:%).
- the refractive index change due to water absorption becomes positive (increase). Therefore, when the lens unit has positive power, Even if the delivery rate is higher than the design value, the paraxial image point position changes in the object-side direction, so focusing is performed when it has a focusing function that moves the entire imaging lens in the optical axis direction. At this time, the imaging lens moves to the image side, so that it does not exceed the design total length, and it is possible to avoid a problem that the focus is not achieved.
- the object position is in the range from infinity to the closest distance. It is possible to avoid the problem that the will not fit.
- the “energy curable resin material” examples include, for example, UV curable resins including epoxy-based resins as long as UV curable resins are cured by applying ultraviolet energy, and UV curable resins including acrylic-based resins. If it is a thermosetting resin that is cured by applying thermal energy, there are a thermosetting resin including an epoxy system and a thermosetting resin including an acrylic system.
- conditional expression (1 ′) is satisfied.
- 0.0 ⁇ dn ⁇ 100 ⁇ 10 ⁇ 5 (1 ′) By setting the value of dn to be equal to or lower than the upper limit of the conditional expression (1 ′), it is possible to further reduce the change in paraxial image point position due to the refractive index by further suppressing the refractive index change due to water absorption.
- conditional expression (1 ′′) is satisfied.
- 0.0 ⁇ dn ⁇ 50 ⁇ 10 ⁇ 5 (1 ′′) By setting the value of dn to be equal to or lower than the upper limit of the conditional expression (1 ′′), the change in the refractive index due to water absorption can be suppressed more effectively, and the variation in the paraxial image point position due to the refractive index can be further reduced.
- the imaging lens described in claim 2 is characterized in that, in the invention described in claim 1, at least one of the lens portions satisfies the following conditional expression (2). . 0.5 ⁇
- f1 is a focal length when the object side and the image side of the lens unit are in contact with air
- f is a combined focal length of the entire imaging lens system.
- is set to be equal to or greater than the lower limit of the conditional expression (2). As a result, it is possible to prevent the problem that the power of the lens portion does not become too weak and the overall length becomes large.
- conditional expression (2 ′) 0.5 ⁇
- the imaging lens according to claim 3 is the invention according to claim 1, wherein the lens portion that satisfies the conditional expression (1) is disposed closest to the object side in the imaging lens. It is characterized by that.
- the imaging lens according to claim 4 is the invention according to claim 2, wherein the lens portion that satisfies the conditional expression (2) is disposed closest to the object side in the imaging lens. It is characterized by that.
- the lens part on the most object side mainly bears the power of the imaging lens for shortening the total length, and by reducing the fluctuation of the paraxial image point position caused by the refractive index change due to water absorption of this lens part, Variations in paraxial image point position due to water absorption of the entire imaging lens system can be effectively suppressed.
- the imaging lens according to claim 5 is the imaging lens according to any one of claims 1 to 4, wherein at least one of the lens portions has the following conditional expression ( 3) is satisfied and has a concave shape.
- l is the length in the radial direction from the outermost periphery of the optical surface portion of the lens portion to the outer diameter of the lens portion
- h is the effective radius of the lens portion.
- the volume of the resin material from the effective diameter of the lens portion to the outer diameter of the resin material within the effective diameter of the lens portion is reduced.
- the resin material within the effective diameter is pushed out from the resin material outside the effective diameter of the lens portion due to the dimensional change accompanying water absorption without becoming too large compared to the volume, and the paraxial image point position due to the dimensional change accompanying water absorption It is possible to prevent the fluctuation from becoming too large.
- the imaging lens according to claim 6 is the energy curable resin material used for at least one of the lens portions in the invention according to any one of claims 1 to 5.
- the dimensional change rate ⁇ due to water absorption satisfies the following conditional expression (4).
- the dimensional change rate ⁇ is the difference between the dimension w1 measured for 3 days at 95 ° C. in an absolutely dry state and the dimension w2 measured for 6 days at 60 ° C. and 90% RH (w2 ⁇ The ratio (w2-w1) / w1 ⁇ 100 [%] of the amount of change with respect to the dimension w1 in the dry state in w1).
- the imaging lens according to claim 7 is the energy curable resin material used for at least one of the lens portions in the invention according to any one of claims 1 to 6. Satisfies the following conditional expression (5). ⁇ ⁇ 4.5% (5) However, ⁇ is a water absorption rate, and the difference between the weight m1 of the energy curable resin material measured at 95 ° C. in an absolutely dry state for 3 days and the weight m2 measured at 60 ° C. and 90% RH for 6 days (m 2 ⁇ The ratio (m2 ⁇ m1) / m1 ⁇ 100 [%] of the amount of change with respect to the completely dry weight m1 in m1).
- the water absorption ⁇ By setting the water absorption ⁇ to be equal to or lower than the upper limit of the conditional expression (5), it is possible to prevent foaming or silver streak (silver stripes) or the like from occurring during the molding of the lens part. If these defects occur in the lens portion, the yield of the product is lowered, which is a very disadvantage for a wafer level lens for mass production.
- the imaging lens according to claim 8 is the invention according to any one of claims 1 to 7, wherein the energy curable resin material is a UV curable resin material. It is characterized by that.
- the lens part By constituting the lens part with a UV curable resin material, the curing time can be shortened and the mass productivity can be improved.
- resins having excellent heat resistance and curable resin materials have been developed, and can withstand a so-called reflow treatment that is exposed to high temperatures for soldering of mounted electronic components.
- the imaging lens according to claim 9 is the energy curable resin material used for at least one of the lens portions in the invention according to any one of claims 1 to 8. Further, inorganic fine particles having a maximum length of 30 nanometers or less are dispersed.
- Dispersing inorganic fine particles of 30 nanometers or less in at least one lens part composed of a resin material can reduce performance deterioration and image point position fluctuations even when the temperature changes, and can transmit light.
- An imaging lens having excellent optical characteristics regardless of environmental changes can be provided without reducing the rate.
- the resin material has a disadvantage that the refractive index is lower than that of the glass material, but it has been found that the refractive index can be increased by dispersing inorganic particles having a high refractive index in the resin material as a base material.
- inorganic particles of 30 nanometers or less in the resin material as the base material preferably 20 nanometers or less, more preferably 15 nanometers or less in the resin material as the base material.
- a material having any temperature dependency can be provided.
- the refractive index of the resin material decreases due to an increase in humidity, if inorganic particles whose refractive index increases as the temperature increases are dispersed in the resin material as the base material, these properties may be canceled out. It is also known that the refractive index change with respect to the temperature change can be reduced.
- the refractive index change with respect to the temperature change can be increased. Specifically, by dispersing inorganic particles of 30 nanometers or less in the resin material as the base material, desirably 20 nanometers or less, more preferably 15 nanometers or less in the resin material as the base material. A material having any temperature dependency can be provided.
- the imaging lens according to claim 10 is an image pickup lens according to any one of claims 1 to 9, wherein at least one of the lens portions is effective except for a lens center. In the region within the diameter, the sign of the inclination of the lens surface shape is the same.
- the same sign of the inclination of the lens surface shape means that a cross section including the optical axis is taken in the imaging lens and the optical axis orthogonal direction is taken as the reference direction from the optical axis along the lens surface shape.
- the direction of the tangent at each point of the lens surface shape is always directed to the same side (left side or right side toward the reference direction) with respect to the reference direction while moving toward the effective diameter side.
- the shape of the lens portions L1a to L2b in FIG. 6 which is Example 1 described later is applicable, but the shape of the lens portions L3a and L3b is not applicable.
- the imaging lens according to claim 11 is the invention according to any one of claims 1 to 10, wherein all surfaces of the lens portion that are in contact with air are aspherical. It is characterized by being. By doing so, the effect of the aspherical surface can be maximally utilized on the boundary surface between the surface in contact with the air and the lens portion with the largest refractive index difference. Further, by making the lens surfaces all aspherical, the occurrence of various aberrations can be minimized, and high performance can be easily achieved.
- the imaging lens according to claim 12 is the imaging lens according to any one of claims 1 to 11, wherein the lens substrate and at least one of the lens portions are optical. It is formed indirectly through at least one of a thin film and an adhesive.
- the optical member By arranging and forming an optical thin film having functions such as an aperture stop and an infrared cut filter between the lens portion and the lens substrate, the optical member can be simplified and the cost can be reduced.
- the lens substrate and the lens part by fixing the lens substrate and the lens part with an adhesive or the like, it becomes possible to preferentially select the optical characteristics even if the resin material of the lens part is poor in adhesion, High performance and high functionality can be realized.
- both the optical thin film and the adhesive are extremely thin, the dimensional change rate due to water absorption of the optical thin film and the adhesive is almost negligible, so there is a difference in dimensional change rate due to water absorption between the lens portion and the lens substrate. This is also an important factor in a lens block that is indirectly fixed through an optical thin film or an adhesive.
- An imaging device includes the imaging lens according to any one of claims 1 to 12 and an imaging element that converts an optical image into an electrical signal.
- An optical image of a subject is formed on the light receiving surface of the image sensor by the imaging lens.
- a digital device includes the imaging device according to claim 13, and is provided with at least one function of still image shooting and moving image shooting of a subject. And Accordingly, it is possible to provide a digital device having an imaging function that can withstand use even in a low-cost and high-humidity environment.
- the digital device described in claim 15 is a portable terminal in the invention described in claim 14, wherein the digital device is a mobile terminal. Accordingly, it is possible to provide a portable terminal having an imaging function that can withstand use even in a low-cost and high-humidity environment.
- the imaging lens manufacturing method according to claim 16 is the imaging lens manufacturing method according to any one of claims 1 to 12, wherein a plurality of the lens blocks are arranged. Forming a connected lens block unit, a connecting step of connecting a plurality of the lens block units via an interval defining portion, and cutting the connected lens block units along the interval defining portion. And a cutting step of separating each lens block. As a result, the imaging lens can be mass-produced at a lower cost.
- the present invention it is possible to provide a low-cost imaging lens, an imaging apparatus, a digital device, and a manufacturing method of an imaging lens that ensure mass productivity and prevent image quality deterioration due to a change in paraxial image point position due to water absorption. it can.
- FIG. 2 is a cross-sectional view of the configuration of FIG. 1 taken along line II-II and viewed in the direction of the arrow. It is a figure which shows the state equipped with the imaging device 50 in the mobile telephone 100 as a portable terminal. 3 is a control block diagram of the mobile phone 100.
- FIG. It is a figure which shows the process of manufacturing the imaging lens used for this Embodiment. 1 is a cross-sectional view of Example 1.
- FIG. FIG. 6 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion (c) of the imaging lens according to Example 1; 6 is a cross-sectional view of Example 2.
- FIG. 6 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion (c) of the imaging lens according to Example 2; 6 is a cross-sectional view of Example 3.
- FIG. FIG. 6 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion aberration (c) of the imaging lens according to Example 3;
- Imaging lens 50 Imaging device 51 Image sensor 51a Photoelectric conversion part 52 Board
- FIG. 1 is a perspective view of an imaging apparatus 50 according to the present embodiment
- FIG. 2 is a cross-sectional view of the configuration of FIG. 1 taken along the line II-II and viewed in the direction of the arrow.
- the imaging device 50 includes a CMOS image sensor 51 as a solid-state imaging device having a photoelectric conversion unit 51 a, an imaging lens 10 that causes the photoelectric conversion unit 51 a of the image sensor 51 to capture a subject image, A substrate 52 having an external connection terminal (not shown) for holding the image sensor 51 and transmitting / receiving the electric signal is provided, and these are integrally formed.
- the imaging lens 10 includes a first lens block BK1, a second lens block BK2, and a third lens block BK3.
- a photoelectric conversion unit 51a as a light receiving unit in which pixels (photoelectric conversion elements) are two-dimensionally arranged is formed in the center of a plane on the light receiving side, and signal processing (not shown) is performed.
- a signal processing circuit includes 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 a signal that forms an image signal output using the digital signal. It consists of a processing unit and the like.
- a number of pads (not shown) are arranged near the outer edge of the plane on the light receiving side of the image sensor 51, and are connected to the substrate 52 via wires (not shown).
- the image sensor 51 converts the signal charge from the photoelectric conversion unit 51a into an image signal such as a digital YUV signal, and outputs the image signal to a predetermined circuit on the substrate 52 via a wire (not shown).
- Y is a luminance signal
- the solid-state imaging device is not limited to the CMOS image sensor, and other devices such as a CCD may be used.
- the substrate 52 that supports the image sensor 51 is communicably connected to the image sensor 51 through a wiring (not shown).
- the substrate 52 is connected to an external circuit (for example, a control circuit included in a host device of a portable terminal mounted with an imaging device) via an external connection terminal (not shown), and a voltage for driving the image sensor 51 from the external circuit. And a clock signal can be received, and a digital YUV signal can be output to an external circuit.
- an external circuit for example, a control circuit included in a host device of a portable terminal mounted with an imaging device
- an external connection terminal not shown
- a clock signal can be received, and a digital YUV signal can be output to an external circuit.
- the upper part of the image sensor 51 is sealed with a plate PT such as an infrared cut filter fixed on the upper surface of the substrate 52.
- a plate PT such as an infrared cut filter fixed on the upper surface of the substrate 52.
- the lower end of the spacer member B3, which is an interval defining portion is fixed.
- the third lens block BK3 is fixed to the upper end of the spacer member B3, and the lower end of another spacer member B2 that is an interval defining portion is fixed to the upper surface of the third lens block BK3, and the upper end of the spacer member B2 is fixed.
- the second lens block BK2 is fixed to the upper surface of the second lens block BK2, and the lower end of another spacer member B1, which is an interval defining portion, is fixed to the upper end of the spacer member B1.
- the spacer members B1 to B3 are configured as separate members as the interval defining portion.
- the present invention is not limited to this.
- at least one of the lens portions L1b and L2a formed on the lens substrate is shown.
- a shape corresponding to the function of the spacer member B1 may be integrally formed as the interval defining portion.
- at least one of the lens portions L2b and L3a may be integrally formed with a shape corresponding to the function of the spacer member B2 as a space defining portion.
- a shape corresponding to the spacer member B2 may be formed integrally with the lens portion L3a
- the shape corresponding to the spacer member B3 may be formed integrally with the lens portion L3b.
- the first lens block BK1 includes a lens substrate LS1 which is a parallel plate and lens portions L1a and L1b formed on the object side and the image plane side thereof.
- the second lens block BK2 is a lens substrate LS2 which is a parallel plate. And the lens portions L2a and L2b formed on the object side and the image plane side.
- the third lens block BK3 includes a lens substrate LS3 that is a parallel plate and lenses formed on the object side and the image plane side. It consists of parts L3a and L3b.
- the dimensional change rate due to water absorption of the lens portions L1a, L2b and L3a is larger than the dimensional change rate due to water absorption of the lens substrate, and the lens portions L1a, L2b having positive power and L3a satisfies the following conditional expression (1).
- dn is a refractive index dn1 measured by placing a UV curable resin material, which is a material of the lens portions L1a to L3a, in an absolutely dry state at 95 ° C. for 3 days, and a refractive index measured by placing it at 60 ° C. and 90% RH for 6 days. This is the difference (dn2-dn1) from dn2.
- the lens portions L1a, L2a, and L3b satisfy the following conditional expression (2).
- f1 is a focal length when the object side and the image side of the lens portions L1a, L2a, and L3b are in contact with air
- f is a combined focal length of the entire imaging lens 10 system.
- the lens portions L1b, L2a, and L3b satisfy the following conditional expression (3) and have a concave shape.
- l is the length in the radial direction from the outermost circumference of the effective diameter portion of the lens portions L1b, L2a and L3b to the outer diameter of the lens portions L1b, L2a and L3b
- h is the effective length of the lens portions L1b, L2a and L3b.
- the dimensional change rate ⁇ due to water absorption of the UV curable resin material that is the material of the lens portions L1a to L3a satisfies the following conditional expression (4).
- the dimensional change rate ⁇ is measured by placing the UV curable resin material, which is the material of the lens portions L1a to L3a, at 95 ° C. in an absolutely dry state for 3 days, and at 6 ° C. and 90% RH for 6 days.
- the UV curable resin material that is the material of the lens portions L1a to L3a satisfies the following conditional expression (5).
- ⁇ is the water absorption rate, measured by placing the UV curable resin material, which is the material of the lens portions L1a to L3a, in a completely dry state at 95 ° C. for 3 days and at 60 ° C. and 90% RH for 6 days.
- the lens portions L1a to L2b have the same sign of the inclination of the lens surface shape in the region within the effective diameter excluding the lens center.
- the lens substrates LS1, LS2, and LS3 are made of a glass material
- the lens portions L1a to L3b whose lens surfaces in contact with air are all aspheric are made of a resin material.
- the lens portions L1a to L3a are preferably made of a UV curable resin material in which inorganic fine particles having a maximum length of 30 nanometers or less are dispersed.
- FIG. 3 is a diagram illustrating a state in which the imaging device 50 is mounted on a mobile phone 100 as a mobile terminal that is a digital device.
- FIG. 4 is a control block diagram of the mobile phone 100.
- the imaging device 50 is provided, for example, such that the object-side end surface of the imaging lens is provided on the back surface of the mobile phone 100 (the liquid crystal display unit side is the front surface) and is located at a position corresponding to the lower side of the liquid crystal display unit.
- the external connection terminal (not shown) of the imaging device 50 is connected to the control unit 101 of the mobile phone 100 and outputs an image signal such as a luminance signal or a color difference signal to the control unit 101 side.
- the mobile phone 100 controls each unit in an integrated manner, and also supports a control unit (CPU) 101 that executes a program corresponding to each process, and inputs a number and the like with keys.
- An input unit 60 a display unit 70 for displaying captured images and videos, a wireless communication unit 80 for realizing various information communications with an external server, a system program and various processing programs for the mobile phone 100,
- a storage unit (ROM) 91 that stores necessary data such as a terminal ID, and various processing programs and data executed by the control unit 101, processing data, imaging data by the imaging device 50, and the like are temporarily stored.
- a temporary storage unit (RAM) 92 used as a work area for storage.
- an image signal of a still image or a moving image is captured by the image sensor 51.
- the image signal input from the imaging device 50 is transmitted to the control system of the mobile phone 100 and stored in the storage unit 92 or displayed on the display unit 70, and further, video information is transmitted via the wireless communication unit 80. Will be transmitted to the outside.
- FIG. 5 is a diagram illustrating a process of manufacturing the imaging lens according to the present embodiment.
- a lens block unit UT including a plurality of lens blocks BK arranged two-dimensionally is manufactured.
- Such a lens block unit UT can be manufactured by, for example, a replica method that can simultaneously produce a large number of lenses L and is low in cost (note that the number of lens blocks BK included in the lens block unit UT is one. May be more than one).
- the replica method is a method in which a curable resin is transferred onto a lens wafer in a lens shape using a mold. That is, in the replica method, a large number of lenses are simultaneously manufactured on the lens wafer.
- the imaging lens 10 is manufactured from the lens block unit UT manufactured by these methods.
- An example of the manufacturing process of this imaging lens is shown in the schematic sectional view of FIG.
- the first lens block unit UT1 includes a first lens substrate LS1 that is a parallel plate, a plurality of first lens portions L1a formed on one plane, and a plurality of second lens portions formed on the other plane. L1b.
- the first lens substrate LS1 and the lens portion L1a are formed through a diaphragm formed of an optical thin film. It is preferable to provide a diaphragm or an infrared cut filter on the lens substrate because the number of constituent members can be reduced as compared with the case where it is provided separately. Furthermore, if a transparent thin film such as an antireflection coating is provided on the lens substrate, reflection between the lens portion and the lens substrate can be prevented, and flare and ghost can be reduced.
- the second lens block unit UT2 includes a second lens substrate LS2 that is a parallel plate, a plurality of third lenses L2a formed on one plane, and a plurality of fourth lenses L2b formed on the other plane. , Composed of. Similarly, if an antireflection coating is provided on the lens substrate, reflection between the lens portion and the lens substrate can be prevented, and flare and ghost can be reduced. Although it is preferable to form the lens portions L2a and L2b directly on the lens substrate LS2, the lens portions L2a and L2b may be formed using an adhesive or the like.
- the third lens block unit UT3 includes a third lens substrate LS3 that is a parallel plate, a plurality of fifth lenses L3a formed on one plane, and a plurality of sixth lenses L3b formed on the other plane. , Composed of. Similarly, if an antireflection coating is provided on the lens substrate, reflection between the lens portion and the lens substrate can be prevented, and flare and ghost can be reduced. Although it is preferable to form the lens portions L3a and L3b directly on the lens substrate LS3, the lens portions L3a and L3b may be formed using an adhesive or the like.
- a grid-like spacer member (spacer) B1 as an interval defining portion is provided between the first lens block unit UT1 and the second lens block unit UT2 (specifically, the first lens substrate LS1 and the second lens substrate). The distance between the lens block units UT1 and UT2 is kept constant. Further, another spacer member B2 as an interval defining portion is interposed between the second lens block unit UT2 and the third lens block unit UT3, and the distance between the lens block units UT2 and UT3 is kept constant. . Further, another spacer member B3 as a space defining portion is interposed between the plate PT and the third lens block unit UT3, and the distance between the plate PT and the lens block unit UT3 is kept constant (that is, the spacer member). B1, B2, and B3 can be said to be a three-stage lattice). In such a state, the lens portions L1a to L3b are positioned in the lattice hole portions of the spacer members B1, B2, and B3.
- the plate PT is a wafer level sensor chip size package including a microlens array, or a parallel flat plate such as a sensor cover glass or an infrared cut filter.
- the spacer member B1 is interposed between the first lens block unit UT1 and the second lens block unit UT2, and the spacer member B2 is the second lens block unit UT2 and the third lens block unit UT3. Since the spacer member B3 is interposed between the third lens block unit UT3 and the plate PT, the lens substrates LS (second lens L1b to sixth lens L3b) are sealed. Integrate.
- the integrated first lens substrate LS1, second lens substrate LS2, third lens substrate LS3, spacer members B1, B2, B3, and plate PT are arranged in the lattice frame of spacer members B1, B2, B3 (position of broken line Q).
- a plurality of imaging lenses 10 each having a three-lens structure integrated with each lens block are obtained.
- the plate PT is a parallel plane plate such as an infrared cut filter
- the imaging lens 10 is attached to the substrate 52 so that the image sensor 51 is sandwiched between the plate PT and the substrate 52, although not shown in the figure.
- the imaging device shown in FIG. 2 can be obtained.
- the imaging lens 10 is manufactured by separating the members in which the plurality of lens blocks BK (the first lens block BK1, the second lens block BK2, and the third lens block BK3) are incorporated, the imaging lens It is not necessary to adjust and assemble every 10 lens intervals. Therefore, mass production of imaging devices that are expected to have high image quality is possible.
- the spacer members B1, B2, and B3 that are the interval defining portions have a lattice shape
- the spacer members B1, B2, and B3 are marks when the imaging lens 10 is separated from the members in which the plurality of lens blocks BK are incorporated. It also becomes. Therefore, the imaging lens 10 can be easily cut out from the members incorporated in the plurality of lens blocks BK, and it does not take time and effort. As a result, the imaging lens 10 can be mass-produced at a low cost.
- the manufacturing method of the imaging lens 10 includes the step of forming the lens block unit UT in which a plurality of lens blocks BK are arranged, and the lens block unit UT intervening with a lattice-like spacer member that is an interval defining portion. It can be said that it includes a connecting step of connecting, and a cutting step of separating the connected lens block units UT for each lens block by cutting along the lattice frame of the interval defining portion.
- Such a manufacturing method is suitable for mass production of an inexpensive lens system. It is also possible to connect only a single lens block unit to the plate.
- lens block unit was demonstrated in the example adhere
- a functional part corresponding to a spacer member may be integrally formed in the part as a space defining part.
- the distance (sag amount) in the optical axis direction from the tangential plane of the surface vertex is X
- the height from the optical axis is h
- R is the paraxial radius of curvature
- K is the conic constant
- X can be expressed by the following formula [Equation 1].
- Example 1 shows lens data in the first example.
- a power of 10 for example, 2.5 ⁇ 10 ⁇ 3
- e for example, 2.5 ⁇ e ⁇ 03
- the F value, half angle of view, full length, and back focus described in the construction data table 1 of Example 1 below are all effective values for the total lens length, finite object distance, that is, the object distance in the table.
- the back focus is the distance from the lens final surface to the paraxial image plane expressed in terms of air length.
- the total lens length is the distance from the lens front surface to the lens final surface plus the back focus. .
- FIG. 6 is a sectional view of the lens of Example 1.
- FIG. 7 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion (c) of the imaging lens according to the first example.
- the alternate long and short dash line represents the g-line
- the solid line represents the d-line
- the broken line represents the spherical aberration amount with respect to the C-line.
- the solid line represents the sagittal surface
- the broken line represents the meridional surface.
- the photographic lens of Example 1 has three lens blocks. More specifically, in order from the object side, the first lens block BK1 is composed of the first lens portion L1a, the aperture stop S made of an optical thin film, the first lens substrate LS1, and the second lens portion L1b. The third lens portion L2a, the second lens substrate LS2, and the fourth lens portion L2b constitute a second lens block BK2. Finally, from the fifth lens portion L3a, the third lens substrate LS3, and the sixth lens portion L3b, A third lens block BK3 is configured. Further, the surfaces of the lens portions that are in contact with all air are aspherical.
- Table 2 shows lens data in the second example.
- FIG. 8 is a sectional view of the lens of Example 2.
- FIG. 9 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion (c) of the imaging lens according to the second example.
- the alternate long and short dash line represents the g-line
- the solid line represents the d-line
- the broken line represents the spherical aberration amount with respect to the C-line.
- the solid line represents the sagittal surface
- the broken line represents the meridional surface.
- the photographic lens of Example 2 has two lens blocks. More specifically, in order from the object side, the first lens block BK1 is configured by the first lens unit L1a, the aperture stop S made of an optical thin film, the first lens substrate LS1, and the second lens unit L1b.
- the third lens unit L2a, the second lens substrate LS2, and the fourth lens unit L2b constitute a second lens block BK2.
- the surface of the lens part which contacts all the air is aspherical.
- Table 2 shows lens data in the third example.
- FIG. 10 is a sectional view of the lens of Example 3.
- FIG. 11 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion (c) of the imaging lens according to the third example.
- the alternate long and short dash line represents the g-line
- the solid line represents the d-line
- the broken line represents the spherical aberration amount with respect to the C-line.
- the solid line represents the sagittal surface
- the broken line represents the meridional surface.
- the photographic lens of Example 3 has two lens blocks. More specifically, in order from the object side, the first lens block BK1 is composed of the first lens portion L1a, the aperture stop S made of an optical thin film, the first lens substrate LS1, and the second lens portion L1b.
- the third lens unit L2a, the second lens substrate LS2, and the fourth lens unit L2b constitute a second lens block BK2. Further, the surfaces of the lens portions that are in contact with all air are aspherical.
- Table 4 shows values corresponding to the conditional expressions of Examples 1 to 3.
- the resin material of Example 1 is a low-dispersion resin material which is a UV curable resin containing an epoxy system with Nd of 1.52 and ⁇ d of 57, and a UV curable resin containing an epoxy system with Nd of 1.55 and ⁇ d of 32
- the highly dispersed resin material is used.
- two types of resin materials are used, but one type or three or more types of resin materials may be used.
- the low-dispersion resin material of Example 1 was placed in an absolutely dry state at 95 ° C. for 3 days, the refractive index dn1L was measured, then placed in 60 ° C. and 90% RH for 6 days, and the refractive index dn2L was measured.
- the difference dnL between the refractive index dn2L and the refractive index dn1L in the first completely dried state was 30 ⁇ 10 ⁇ 5 .
- the highly dispersed resin material of Example 1 was placed in an absolutely dry state at 95 ° C. for 3 days to measure the refractive index dn1H, and then placed at 60 ° C. and 90% RH for 6 days to measure the refractive index dn2H.
- the difference dnH between the refractive index dn2H and the refractive index dn1H in the first completely dried state was 260 ⁇ 10 ⁇ 5 . Assuming that only the refractive index has changed due to water absorption, the amount of change in the paraxial image point position is -0.001 [mm].
- Comparative Example 1 an existing low-dispersion resin material whose refractive index change due to water absorption does not satisfy the conditional expression (1) is placed at 95 ° C. in an absolutely dry state for 3 days, and the refractive index dn1L ′ is measured.
- the film was placed at 60 ° C. and 90% RH for 6 days, and the refractive index dn2L ′ was measured.
- the difference dnL ′ between the refractive index dn1L ′ and the refractive index dn2L ′ in the first completely dried state was 200 ⁇ 10 ⁇ 5 .
- the highly dispersed resin material was placed at 95 ° C.
- the F value of the imaging lens of Example 1 is 2.88, and when the pixel pitch of the imaging device combined with the imaging lens is 1.70 ⁇ m or more, for example, 1.75 ⁇ m, the depth of focus is approximately 2 ⁇ F (where ⁇ is an allowable confusion). Circle, F is expressed by F value), and assuming that the permissible circle of confusion is 2 pixel pitch, the depth of focus is 20.2 ⁇ m. Since this value is a range in the optical axis direction with the image plane serving as the design value approximately at the center, the fluctuation amount of the paraxial image point position of the design value due to water absorption is within half of 10.1 ⁇ m.
- the refractive index dn1H of the highly dispersed resin material of Example 1 was measured for 3 days in an absolutely dry state at 95 ° C. and then measured for 6 days at 60 ° C. and 90% RH, and the refractive index dn2H was measured.
- the difference dnH from the refractive index dn1H in the completely dried state is 260 ⁇ 10 ⁇ 5
- the low-dispersion resin material of Example 1 is placed in an absolutely dry state at 95 ° C. for 3 days to obtain a refractive index dn1L. After measurement, the refractive index dn2L is measured at 60 ° C.
- the difference dnL between the refractive index dn2L and the refractive index dn1L in the first completely dried state is 30 ⁇
- 70 ⁇ 10 ⁇ 5 , 110 ⁇ 10 ⁇ 5 , 150 ⁇ 10 ⁇ 5 , 190 ⁇ 10 ⁇ 5 , 200 ⁇ 10 ⁇ 5 , 220 ⁇ 10 ⁇ 5 only the refractive index changed due to water absorption. Assuming that the paraxial image point position changes The amount is shown in Table 5 below.
- the pixel pitch will become narrower in the future. For example, even when the pixel pitch is 1.0 ⁇ m or more, if the difference dnL from the refractive index dn1L is 100 ⁇ 10 ⁇ 5 or less, the pixel pitch is reduced. There is no problem due to the influence of the fluctuation of the axial image point position.
- the resin material of Example 2 is a low dispersion resin material that is a UV curable resin containing an epoxy system with Nd of 1.51 and ⁇ d of 57, and a UV curable resin containing an epoxy system with Nd of 1.57 and ⁇ d of 34.
- the highly dispersed resin material is used. In this embodiment, two types of resin materials are used, but one type or three or more types of resin materials may be used.
- the low-dispersion resin material of Example 2 was placed in an absolutely dry state at 95 ° C. for 3 days to measure the refractive index dn1L, then placed in 60 ° C. and 90% RH for 6 days, and the refractive index dn2L was measured.
- the difference dnL between the refractive index dn2L and the refractive index dn1L in the first completely dried state was 100 ⁇ 10 ⁇ 5 .
- the highly dispersed resin material of Example 2 was placed in an absolutely dry state at 95 ° C. for 3 days and the refractive index dn1H was measured, then placed at 60 ° C. and 90% RH for 6 days, and the refractive index dn2H was measured.
- the difference dnH between the refractive index dn2H and the refractive index dn1H in the first completely dried state was 60 ⁇ 10 ⁇ 5 . Assuming that only the refractive index has changed due to water absorption, the amount of change in the paraxial image point position is -0.008 [mm].
- Comparative Example 2 an existing low-dispersion resin material whose refractive index change due to water absorption does not satisfy the conditional expression (1) is placed at 95 ° C. in an absolutely dry state for 3 days, and the refractive index dn1L ′ is measured.
- the film was placed at 60 ° C. and 90% RH for 6 days, and the refractive index dn2L ′ was measured.
- the difference dnL ′ between the refractive index dn1L ′ and the refractive index dn2L ′ in the first completely dried state was 200 ⁇ 10 ⁇ 5 .
- the highly dispersed resin material was placed in an absolutely dry state at 95 ° C.
- Example 2 measured for refractive index dn1H, then placed at 60 ° C. and 90% RH for 6 days, and measured for refractive index dn2H.
- the difference dnH between the refractive index dn2H and the refractive index dn1H in the first completely dried state was 60 ⁇ 10 ⁇ 5 .
- the amount of change in the paraxial image point position is -0.016 [mm].
- the resin material of Example 3 is a low dispersion resin material which is a UV curable resin containing an epoxy system with Nd of 1.52 and ⁇ d of 55, and a UV curable resin containing an epoxy system with Nd of 1.57 and ⁇ d of 34.
- the highly dispersed resin material is used. In this embodiment, two types of resin materials are used, but one type or three or more types of resin materials may be used.
- the low-dispersion resin material of Example 3 was placed in an absolutely dry state at 95 ° C. for 3 days, the refractive index dn1L was measured, then placed in 60 ° C. and 90% RH for 6 days, and the refractive index dn2L was measured.
- the difference dnL between the refractive index dn2L and the refractive index dn1L in the first completely dried state was 140 ⁇ 10 ⁇ 5 .
- the highly dispersed resin material of Example 3 was placed in an absolutely dry state at 95 ° C. for 3 days, the refractive index dn1H was measured, then placed at 60 ° C. and 90% RH for 6 days, and the refractive index dn2H was measured.
- the difference dnH between the refractive index dn2H and the refractive index dn1H in the first completely dried state was 60 ⁇ 10 ⁇ 5 . Assuming that only the refractive index has changed due to water absorption, the amount of change in the paraxial image point position is -0.011 [mm].
- Comparative Example 3 an existing low-dispersion resin material whose refractive index change due to water absorption does not satisfy the conditional expression (1) is placed at 95 ° C. in an absolutely dry state for 3 days, and the refractive index dn1L ′ is measured.
- the film was placed at 60 ° C. and 90% RH for 6 days, and the refractive index dn2L ′ was measured.
- the difference dnL ′ between the refractive index dn1L ′ and the refractive index dn2L ′ in the first completely dried state was 200 ⁇ 10 ⁇ 5 .
- the highly dispersed resin material was placed in an absolutely dry state at 95 ° C.
- Example 3 measured for the refractive index dn1H, then placed at 60 ° C. and 90% RH for 6 days, and the refractive index dn2H was measured.
- the difference dnH between the refractive index dn2H and the refractive index dn1H in the first completely dried state was 60 ⁇ 10 ⁇ 5 .
Abstract
Description
0.0 ≦ dn ≦ 150×10-5 (1)
但し、dnとは、前記エネルギー硬化型樹脂材料を95℃絶乾状態に3日間置き測定した屈折率dn1と、60℃90%RHに6日間置き測定した屈折率dn2との差(dn2-dn1)をいう。尚、本明細書中において、「絶乾状態」とは、雰囲気中に水分を含まない状態をいい、「RH」とは、相対湿度(relative humidity)のことであり、ある温度(ここでは60℃)で雰囲気中に含まれる水蒸気の量(質量絶対湿度)を、その温度の飽和水蒸気量(質量絶対湿度)で割ったもの(単位:%)である。
0.0 ≦ dn ≦ 100×10-5 (1’)
dnの値を条件式(1’)の上限以下とすることで、吸水による屈折率変化をより抑えることで、屈折率による近軸像点位置の変動を更に低減することができる。
0.0 ≦ dn ≦ 50×10-5 (1”)
dnの値を条件式(1”)の上限以下とすることで、吸水による屈折率変化をより有効に抑えることで、屈折率による近軸像点位置の変動を一層低減することができる。
0.5 ≦ |f1/f| ≦ 1.1 (2)
但し、f1は前記レンズ部の物体側と像側が空気に接しているとしたときの焦点距離であり、fは前記撮像レンズ全系の合成焦点距離である。
0.5 ≦ |f1/f| ≦ 0.7 (2’)
条件式(2’)を満足することにより、吸水に伴う屈折率変化による近軸像点位置の変動を、より効果的に低減することができる。
l/h ≦ 3.5 (3)
但し、lは前記レンズ部の光学面部最外周から前記レンズ部の外径までの半径方向の長さであり、hは前記レンズ部の有効半径である。
l/h ≦ 1.5 (3’)
条件式(3’)を満足することで、吸水に伴う寸法変化による近軸像点位置の変動が大きくなりすぎることを、より効果的に防止することができる。
|α| ≦ 3.0% (4)
但し、寸法変化率αとは、前記エネルギー硬化型樹脂材料を95℃絶乾状態に3日間置き測定した寸法w1と、60℃90%RHに6日間置き測定した寸法w2との差(w2-w1)における、絶乾時寸法w1に対する変化量の割合(w2-w1)/w1×100[%]をいう。
|α| ≦ 1.5% (4’)
寸法変化率の絶対値|α|を条件式(4’)の上限以下とすることで、前記レンズ部の吸水による寸法変化がより小さくなり、前記レンズ部の曲率が変化することによる近軸像点位置の変化を低減できる。
|α| ≦ 1.0% (4”)
寸法変化率の絶対値|α|を条件式(4”)の上限以下とすることで、前記レンズ部の吸水による寸法変化が一層小さくなり、前記レンズ部の曲率が変化することによる近軸像点位置の変化をより有効に低減できる。
ρ ≦ 4.5% (5)
但し、ρは吸水率であり、前記エネルギー硬化型樹脂材料を95℃絶乾状態に3日間置き測定した重量m1と、60℃90%RHに6日間置き測定した重量m2との差(m2-m1)における、絶乾時重量m1に対する変化量の割合(m2-m1)/m1×100[%]をいう。
ρ ≦ 3.5% (5’)
吸水率ρを条件式(5’)の上限以下とすることで、前記レンズ部の成形時に発泡したり、シルバーストリーク(銀条)等が発生したりすることを、より効果的に防ぐことができる。
ρ ≦ 2.0% (5”)
吸水率ρを条件式(5”)の上限以下とすることで、前記レンズ部の成形時に発泡したり、シルバーストリーク(銀条)等が発生したりすることを、一層効果的に防ぐことができる。
50 撮像装置
51 イメージセンサ
51a 光電変換部
52 基板
60 入力部
70 表示部
80 無線通信部
92 記憶部
100 携帯電話機
101 制御部
LS1、LS2、LS3 レンズ基板
L1a、L1b、L2a、L2b、L3a、L3b レンズ部
0.0 ≦ dn ≦ 150×10-5 (1)
但し、dnとは、レンズ部L1a~L3aの素材であるUV硬化型樹脂材料を95℃絶乾状態に3日間置き測定した屈折率dn1と、60℃90%RHに6日間置き測定した屈折率dn2との差(dn2-dn1)をいう。
0.5 ≦ |f1/f| ≦ 1.1 (2)
但し、f1はレンズ部L1a、L2a及びL3bの物体側と像側が空気に接しているとしたときの焦点距離であり、fは撮像レンズ10全系の合成焦点距離である。
l/h ≦ 3.5 (3)
但し、lはレンズ部L1b、L2a及びL3bの有効径部最外周からレンズ部L1b、L2a及びL3bの外径までのそれぞれ半径方向の長さであり、hはレンズ部L1b、L2a及びL3bの有効半径である。
|α| ≦ 3.0% (4)
但し、寸法変化率αとは、レンズ部L1a~L3aの素材であるUV硬化型樹脂材料を95℃絶乾状態に3日間置き測定した寸法w1と、60℃90%RHに6日間置き測定した寸法w2との差(w2-w1)における、絶乾時寸法w1に対する変化量の割合(w2-w1)/w1×100[%]をいう。
ρ ≦ 4.5% (5)
但し、ρは吸水率であり、レンズ部L1a~L3aの素材であるUV硬化型樹脂材料を95℃絶乾状態に3日間置き測定した重量m1と、60℃90%RHに6日間置き測定した重量m2との差(m2-m1)における、絶乾時重量m1に対する変化量の割合(m2-m1)/m1×100「%]をいう。
Fl :撮像レンズ全系の焦点距離
BF :バックフォーカス
Fno :Fナンバー
Ymax:像面の対角長さ
r :レンズ面の近軸曲率半径
d :レンズの面間隔
Nd :レンズのd線における屈折率
νd :レンズのd線におけるアッベ数
w :半画角
TL :レンズ全長
* :非球面位置
stop:絞り位置
また、本発明における非球面形状は以下のように定義する。すなわち、面頂点の接平面からの光軸方向の距離(サグ量)をX、光軸からの高さをhとして、Rを近軸曲率半径、Kを円錐定数、An(=4、6、8、…、14)を第n次の非球面係数としたとき、Xは以下の数式[数1]で表せるものとする。
第1実施例におけるレンズデータを表1に示す。尚、以降の表中では、10のべき乗数(例えば、2.5×10-3)を、e(例えば、2.5×e-03)を用いて表すものとする。以下の実施例1のコンストラクションデータ表1内に記載したF値、半画角、全長、バックフォーカスはすべて、レンズ全長、有限の物体距離、つまり表内の物体距離における実効値である。また、バックフォーカスとは、レンズ最終面から近軸像面までの距離を空気換算長により表記し、レンズ全長とは、レンズ最前面からレンズ最終面までの距離にバックフォーカスを加えたものである。
第2実施例におけるレンズデータを表2に示す。
第3実施例におけるレンズデータを表2に示す。
Claims (16)
- 平行平板であるレンズ基板の物体側面及び像側面のうち少なくとも一方に、正のパワーを有するレンズ部が形成されたレンズブロックを少なくとも1つ有し、前記レンズ部は、前記レンズ基板と材質が異なるエネルギー硬化型樹脂材料で形成され、前記レンズ部のうち少なくとも1つの正のパワーを持つレンズ部は、吸水による寸法変化率が、前記レンズ基板の吸水による寸法変化率よりも大きく、且つ、以下の条件式(1)を満足することを特徴とする撮像レンズ。
0.0 ≦ dn ≦ 150×10-5 (1)
但し、dnとは、前記エネルギー硬化型樹脂材料を95℃絶乾状態に3日間置き測定した屈折率dn1と、60℃90%RHに6日間置き測定した屈折率dn2との差(dn2-dn1)をいう。 - 前記レンズ部のうち少なくとも1つは、以下の条件式(2)を満足することを特徴とする請求の範囲第1項に記載の撮像レンズ。
0.5 ≦ |f1/f| ≦ 1.1 (2)
但し、f1は前記レンズ部の物体側と像側が空気に接しているとしたときの焦点距離であり、fは前記撮像レンズ全系の合成焦点距離である。 - 前記条件式(1)を満足するレンズ部は、前記撮像レンズにおいて最も物体側に配置されていることを特徴とする請求の範囲第1項に記載の撮像レンズ。
- 前記条件式(2)を満足するレンズ部は、前記撮像レンズにおいて最も物体側に配置されていることを特徴とする請求の範囲第2項に記載の撮像レンズ。
- 前記レンズ部のうち少なくとも1つは、以下の条件式(3)を満足し、凹面形状を有することを特徴とする請求の範囲第1項から第4項までのいずれか一項に記載の撮像レンズ。
l/h ≦ 3.5 (3)
但し、lは前記レンズ部の光学面部最外周から前記レンズ部の外径までの半径方向の長さであり、hは前記レンズ部の有効半径である。 - 前記レンズ部の少なくとも1つに用いる前記エネルギー硬化型樹脂材料の吸水による寸法変化率αは、以下の条件式(4)を満足することを特徴とする請求の範囲第1項から第5項までのいずれか一項に記載の撮像レンズ。
|α| ≦ 3.0% (4)
但し、寸法変化率αとは、前記エネルギー硬化型樹脂材料を95℃絶乾状態に3日間置き測定した寸法w1と、60℃90%RHに6日間置き測定した寸法w2との差(w2-w1)における、絶乾時寸法w1に対する変化量の割合(w2-w1)/w1×100[%]をいう。 - 前記レンズ部の少なくとも1つに用いる前記エネルギー硬化型樹脂材料は、以下の条件式(5)を満足することを特徴とする請求の範囲第1項から第6項までのいずれか一項に記載の撮像レンズ。
ρ ≦ 4.5% (5)
但し、ρは吸水率であり、前記エネルギー硬化型樹脂材料を95℃絶乾状態に3日間置き測定した重量m1と、60℃90%RHに6日間置き測定した重量m2との差(m2-m1)における、絶乾時重量m1に対する変化量の割合(m2-m1)/m1×100[%]をいう。 - 前記エネルギー硬化型樹脂材料は、UV硬化型樹脂材料であることを特徴とする請求の範囲第1項から第7項までのいずれか一項に記載の撮像レンズ。
- 前記レンズ部の少なくとも1つに用いる前記エネルギー硬化型樹脂材料に最大長30ナノメートル以下の無機微粒子を分散させたことを特徴とする請求の範囲第1項から第8項までのいずれか一項に記載の撮像レンズ。
- 前記レンズ部の少なくとも1つは、レンズ中心を除く、有効径内の領域において、レンズ面形状の傾きの符号が同じであることを特徴とする請求の範囲第1項から第9項までのいずれか一項に記載の撮像レンズ。
- 前記レンズ部の空気と接する全ての面が非球面形状であることを特徴とする請求の範囲第1項から第10項までのいずれか一項に記載の撮像レンズ。
- 前記レンズ基板と、少なくとも1つの前記レンズ部とが、光学薄膜及び接着剤のうち少なくとも一方を介して間接的に形成されていることを特徴とする請求の範囲第1項から第11項までのいずれか一項に記載の撮像レンズ。
- 請求の範囲第1項から第12項までのいずれか一項に記載の撮像レンズと光学像を電気的な信号に変換する撮像素子を有し、前記撮像レンズにより前記撮像素子の受光面上に被写体の光学像を形成することを特徴とする撮像装置。
- 請求の範囲第13項に記載の撮像装置を含み、被写体の静止画撮影、動画撮影のうちの少なくとも一方の機能が付加されていることを特徴とするデジタル機器。
- 前記デジタル機器は、携帯端末であることを特徴とする請求の範囲第14項に記載のデジタル機器。
- 請求の範囲第1項から第12項までのいずれか1項に記載の撮像レンズの製造方法であって、
前記レンズブロックが複数並べられたレンズブロックユニットを形成する工程と、
複数の前記レンズブロックユニットを、間隔規定部を介在させてつなげる連結工程と、
連結された前記レンズブロックユニットを前記間隔規定部に沿って切断することにより、前記レンズブロック毎に分離する切断工程と、を含むことを特徴とする撮像レンズの製造方法。
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US12/933,156 US8368786B2 (en) | 2008-03-21 | 2009-03-16 | Image pickup lens including at least one lens block wherein a lens portion or lens portions are formed on a lens substrate, image pickup device, digital apparatus and manufacturing method of image pickup lens |
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US20110007195A1 (en) | 2011-01-13 |
US8368786B2 (en) | 2013-02-05 |
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