WO2015108194A1 - Système optique d'imagerie, dispositif d'imagerie et terminal mobile - Google Patents

Système optique d'imagerie, dispositif d'imagerie et terminal mobile Download PDF

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Publication number
WO2015108194A1
WO2015108194A1 PCT/JP2015/051289 JP2015051289W WO2015108194A1 WO 2015108194 A1 WO2015108194 A1 WO 2015108194A1 JP 2015051289 W JP2015051289 W JP 2015051289W WO 2015108194 A1 WO2015108194 A1 WO 2015108194A1
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Prior art keywords
lens
imaging
optical system
image
coating layer
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PCT/JP2015/051289
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English (en)
Japanese (ja)
Inventor
古後将司
地大英隆
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コニカミノルタ株式会社
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Publication of WO2015108194A1 publication Critical patent/WO2015108194A1/fr

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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
    • 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 optical system used for a solid-state imaging device such as a CCD type image sensor or a CMOS type image sensor, an imaging device provided with the imaging optical system, and a portable terminal provided with the imaging device.
  • a solid-state imaging device such as a CCD type image sensor or a CMOS type image sensor
  • an imaging device provided with the imaging optical system and a portable terminal provided with the imaging device.
  • an infrared (IR) cut filter needs to be placed in front of the image sensor.
  • IR infrared
  • a sufficient distance between the most image side surface of the lens and the imaging element leads to an increase in the overall length of the imaging lens. It becomes.
  • the IR cut filter due to the characteristics of the IR cut filter, if the incident angle to the filter surface (the angle formed by the filter surface normal and the light beam) differs greatly for each light beam that forms an image at each position of the image sensor, the IR cut effect is effective.
  • the IR cut filter placed between the most image side surface of the lens and the image sensor, which has been conventionally used, is removed, and instead the IR cut coat is applied to the lens surface, thereby reducing the number of parts of the optical system.
  • An imaging optical system capable of reducing the height has been proposed (see Patent Document 1). Specifically, the imaging optical system described in Patent Document 1 minimizes the incident angle difference on the IR cut coat surface from the light beam that forms an image at the center of the image sensor to the light beam that forms an image around the image sensor. Therefore, an IR cut coat is applied to the lens surface whose center of curvature is substantially at the aperture center of the stop.
  • An object of the present invention is to provide an imaging optical system having a compact and good imaging performance in which the adverse effect on the color due to near infrared rays is suppressed over the entire field angle.
  • an object of this invention is to provide an imaging device provided with the above-mentioned imaging optical system, and a portable terminal provided with the said imaging device.
  • an imaging optical system includes a coating layer for suppressing transmittance in a wavelength region of 700 nm or more on at least one surface of a lens, and the lens surface having the coating layer has the following conditional expression: Satisfied. 1.5 ⁇ [he 2 /(2.R)]/Sag(he) ⁇ 29 (1)
  • R Distance on the optical axis from the apex of the surface having the coating layer to the center of the aperture stop (the image side is defined as +)
  • he Effective radius of the target surface (the target surface is a surface having a coating layer)
  • Sag (he): Sag amount at the height he on the target surface (the image side is set to +)
  • Conditional expression (1) is a conditional expression for achieving good imaging performance while keeping the imaging optical system compact. By exceeding the lower limit of conditional expression (1), it is possible to prevent the coating surface from being excessively curved, and to make the thickness of the coating film substantially uniform at the center and the periphery of the lens. Therefore, it is possible to obtain an optical system with good performance in which there is almost no difference in color due to the IR cut effect between the center and the periphery of the subject.
  • the imaging optical system can be made compact.
  • the incident angle difference on the coating surface is made as small as possible from the light beam focused on the center of the image sensor to the light beam focused on the periphery. Can do.
  • an imaging apparatus includes the above-described imaging optical system and an imaging element that photoelectrically converts an image formed on the imaging surface by the imaging optical system.
  • the portable terminal according to the present invention includes an imaging apparatus having a compact and good imaging performance in which the adverse effect of the color due to the near infrared rays is suppressed in the entire angle of view as described above.
  • FIG. 2 is a cross-sectional view of an imaging lens of Example 1.
  • FIG. 7A to 7C are aberration diagrams of the imaging lens of Example 1.
  • FIG. 6 is a cross-sectional view of an imaging lens of Example 2.
  • FIG. 9A to 9C are aberration diagrams of the imaging lens of Example 2.
  • FIG. 6 is a cross-sectional view of an imaging lens of Example 3.
  • FIG. 11A to 11C are aberration diagrams of the imaging lens of Example 3.
  • the imaging lens 10 illustrated in FIG. 1 has the same configuration as the imaging lens 11 of Example 1 described later.
  • FIG. 1 is a cross-sectional view illustrating a camera module including an imaging lens according to an embodiment of the present invention.
  • the camera module 50 includes an imaging lens 10 that is an imaging optical system that forms a subject image, an imaging element 51 that detects a subject image formed by the imaging lens 10, and holds the imaging element 51 from behind and wiring and the like.
  • a wiring board 52 having the imaging lens 10 and the like, and a lens barrel portion 54 having an opening OP through which a light beam from the object side is incident.
  • the imaging lens 10 has a function of forming a subject image on the image plane or the imaging plane (projected plane) I of the imaging element 51.
  • the camera module 50 is used by being incorporated in an imaging device 100 described later, but it is also called an imaging device alone.
  • the imaging lens 10 forms a subject image on the imaging surface (projected surface) I of the image sensor 51, and in order from the object side, the first lens L1, the second lens L2, and the third lens L3. And a fourth lens L4 and a fifth lens L5.
  • the aperture stop S is disposed on the object side surface S11 side of the first lens L1.
  • the image sensor 51 is a sensor chip made of a solid-state image sensor.
  • the photoelectric conversion unit 51a of the image sensor 51 is composed of a CCD (charge coupled device) or a CMOS (complementary metal oxide semiconductor), photoelectrically converts incident light for each RGB, and outputs an analog signal thereof.
  • the photoelectric conversion surface of the photoelectric conversion unit 51a as the light receiving unit is an image surface or an imaging surface (projected surface) I.
  • the wiring board 52 has a role of aligning and fixing the image sensor 51 to other members (for example, the lens barrel portion 54).
  • the wiring board 52 can receive a voltage and a signal for driving the image pickup device 51 and the driving mechanism 55a from an external circuit, and can output a detection signal to the external circuit.
  • the parallel plate F is disposed and fixed on the imaging lens 10 side of the imaging element 51 by a holder member (not shown) so as to cover the imaging element 51 and the like.
  • the lens barrel portion 54 houses and holds the imaging lens 10.
  • the lens barrel portion 54 enables the focusing operation of the imaging lens 10 by moving any one or more of the lenses L1 to L5 constituting the imaging lens 10 along the optical axis AX.
  • it has a drive mechanism 55a.
  • the drive mechanism 55a reciprocates the specific lens or all the lenses along the optical axis AX.
  • the drive mechanism 55a includes, for example, a voice coil motor and a guide.
  • the drive mechanism 55a can be configured by a stepping motor or the like instead of the voice coil motor or the like.
  • the mobile communication terminal 300 is a smartphone-type mobile communication terminal or mobile terminal, and wireless communication for realizing various information communication between the imaging apparatus 100 having the camera module 50 and an external system or the like via the antenna 331. Part 330.
  • the mobile communication terminal 300 includes an operation unit including a power switch and a storage unit (ROM or the like) storing necessary data such as a system program, various processing programs, and a terminal ID. Also equipped.
  • the imaging apparatus 100 includes an optical system driving unit 101, an imaging interface (I / F) 102, an image processing circuit (ISP) 103, a temporary storage unit (RAM) 104, a data storage unit (EEPROM) 105, CPU 106, display operation unit interface 107, auxiliary storage unit interface 108, display operation unit (LCD) 310, auxiliary storage unit (SD card, etc.) 320, and the like.
  • the imaging interface 102, the image processing circuit 103, the temporary storage unit 104, the data storage unit 105, the CPU 106, the display operation unit interface 107, and the auxiliary storage unit interface 108 are the control unit 110 for driving the camera module 50 and the like.
  • the control unit 110 also includes a communication unit interface 109.
  • the image processing circuit 103, the temporary storage unit 104, the data storage unit 105, and the CPU 106 serve as an image processing unit 111 that processes an image signal output from the camera module 50.
  • the optical system driving unit 101 controls the state of the imaging lens 10 by operating the driving mechanism 55a of the imaging lens 10 when performing focusing, exposure, and the like under the control of the CPU 106.
  • the optical system driving unit 101 can cause the imaging lens 10 to perform a focusing operation by operating the driving mechanism 55a to appropriately move specific or all lenses in the imaging lens 10 along the optical axis AX.
  • the imaging interface 102 is a part for receiving the image signal output from the imaging element 51 to the control unit 110.
  • the image processing circuit 103 performs image processing on the image signal output from the image sensor 51.
  • the image processing circuit 103 performs processing on the frame image constituting the image signal, for example, corresponding to a moving image.
  • the image processing circuit 103 executes distortion correction processing on the image signal based on the lens correction data read from the data storage unit 105 in addition to normal image processing such as color correction, gradation correction, and zooming. .
  • the temporary storage unit 104 is used as a work area for temporarily storing various processing programs executed by the control unit 110, data necessary for the execution, processing data, imaging data by the imaging apparatus 100, and the like.
  • the data storage unit 105 stores lens correction data used for image processing. Specifically, in addition to data for color correction, gradation correction, etc., parameters for distortion correction are stored.
  • the CPU 106 comprehensively controls each unit and executes a program corresponding to each process.
  • the CPU 106 performs various image processing such as color correction, gradation correction, and distortion correction on the signal before processing by the image processing circuit 103 based on the lens correction data read from the data storage unit 105.
  • image signal processed by the image processing circuit 103 can be subjected to the same processing as the image processing circuit 103, compression, or other image processing.
  • the display operation unit interface 107 transfers the image signal output from the image processing circuit 103 or the CPU 106 to the display operation unit 310 and transfers the operation signal from the display operation unit 310 to the CPU 106.
  • the auxiliary storage unit interface 108 outputs the moving image and the image data as a still image output from the image processing circuit 103 or the like to the auxiliary storage unit 320.
  • the display operation unit 310 is a touch panel that displays data related to communication, captured images, and the like and accepts user operations.
  • the auxiliary storage unit 320 is detachable and is a part that records and stores the image signal processed by the image processing unit 111.
  • the photographing operation of the mobile communication terminal 300 including the imaging device 100 will be described.
  • subject monitoring through image display
  • image shooting execution are performed.
  • an image of a subject obtained through the imaging lens 10 is formed on the imaging surface I (see FIG. 1) of the imaging element 51.
  • the image sensor 51 is scanned and driven by an image sensor drive unit (not shown), and outputs one frame of a digital signal obtained by digitizing a photoelectric conversion output corresponding to an optical image formed at a fixed period.
  • the digital signal is input to the image processing circuit 103 and the like, and an image signal (video signal) subjected to image processing is generated and output to the display operation unit 310 and the auxiliary storage unit 320.
  • the image signal from the image sensor 51 or the image processing circuit 103 is temporarily stored in the temporary storage unit 104.
  • the display operation unit 310 functions as a finder in monitoring and displays captured images in real time. In this state, focusing, exposure, and the like of the imaging lens 10 are set by driving the optical system driving unit 101 based on an operation input performed by the user via the display operation unit 310 at any time.
  • still image data is captured when the user appropriately operates the display operation unit 310.
  • One frame of image data (imaging data) is read and compressed according to the operation content of the display operation unit 310.
  • the compressed image data is recorded in the temporary storage unit 104 or the like via the control unit 110, for example.
  • the image signal output from the camera module 50 including the imaging lens 10 is input to the control unit 110 via the imaging interface 102.
  • the image signal to be displayed corresponds to a still image
  • the image signal is stored in the temporary storage unit 104
  • the CPU 106 reads out the lens correction data from the data storage unit 105, and the CPU 106 or the image processing circuit.
  • 103 performs various image processing on the image signal based on the correction data, and returns the image signal to the temporary storage unit 104.
  • the image processing includes image processing for displaying on the display operation unit 310 and image processing for storing in the auxiliary storage unit 320.
  • the image signal to be displayed corresponds to a moving image
  • the image signal is input only to the image processing circuit 103, and the image processing circuit 103 reads the image signal based on the lens correction data read from the correction data.
  • Various image processing is performed on the image.
  • the image signal subjected to the image processing is displayed on the display operation unit 310 via the display operation unit interface 107. Further, the image signal subjected to image processing can be recorded in the auxiliary storage unit 320 via the auxiliary storage unit interface 108.
  • the above-described imaging device 100 is an example of an imaging device suitable for the present invention, and the present invention is not limited to this.
  • the image pickup apparatus equipped with the camera module 50 or the image pickup lens 10 is not limited to the one built in the smartphone type mobile communication terminal 300, but is built into a mobile phone, a PHS (Personal Handyphone System), or the like. Alternatively, it may be incorporated in a PDA (Personal Digital Assistant), tablet personal computer, mobile personal computer, digital still camera, video camera, or the like.
  • PDA Personal Digital Assistant
  • the imaging lens 10 shown in FIG. 1 includes, in order from the object side, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5. Become.
  • the imaging lens 10 is composed of two or more lenses, and it is easy to have a good imaging performance with well-suppressed aberrations.
  • the aperture stop S is disposed on the object side of the first lens L1.
  • a coating layer that suppresses the transmittance in the wavelength region of 700 nm or more is provided on at least one surface of the lens constituting the imaging lens 10.
  • the coating layer is provided on the image side surface S32 of the third lens L3.
  • the coating layer may also be provided on the object side surface S11 of the first lens L1, the object side surface S41 of the fourth lens L4, the object side surface S51 of the fifth lens L5, and the image side surface S52 of the fifth lens L5.
  • the coating layer is made of a high refractive index material such as TiO 2 , ZrO 2 , Ta 2 O 2 , and Nb 2 O 5 and a low refractive index such as SiO 2 and MgF 2 with respect to the lens surface by using a vapor deposition device or the like. It is formed of a dielectric multilayer film in which a plurality of materials are alternately stacked to form several tens of layers.
  • FIG. 4 shows an example of the transmission characteristics of the coating layer.
  • the horizontal axis represents wavelength (nm) and the vertical axis represents transmittance (%).
  • the illustrated coating layer has a transmission window in the wavelength range of about 410 nm to 700 m.
  • All the lenses L1 to L5 are assumed to be plastic lenses. Between the light exit surface of the fifth lens L5 and the imaging surface (image surface) I, a parallel plate F having an appropriate thickness is disposed.
  • the parallel plate F is assumed to be an optical low-pass filter, a seal glass of a solid-state image sensor, or the like. Note that an optical low-pass filter or the like is not necessarily provided as the parallel plate F.
  • at least one lens is an aspherical lens made of a resin material including an infrared absorbing material that absorbs infrared rays.
  • the lens 10 for imaging with good imaging performance in which there is almost no color difference due to the IR cut effect between the center and the periphery of the subject.
  • the third lens L3 is formed of a resin material including an infrared absorbing material that absorbs infrared rays.
  • the infrared absorbing material include fine particles of ITO (indium tin oxide) and ATO (antimony-doped tin oxide).
  • the coating layer that cuts infrared rays may not be one that does not transmit the entire wavelength region of 700 nm or more.
  • the transmittance of a lens to which an infrared absorbing material is added can be suppressed to 1% or less in the wavelength range of 700 to 800 nm
  • the transmittance at a wavelength of 800 nm or more may be suppressed by the coating layer.
  • the transmittance at a wavelength of 800 nm to 1200 nm is set to 1% or less by the coating layer.
  • any of the lenses L1, L2, L3, L4, and L5 constituting the imaging lens 10 or two or more of these lenses can be made of a resin material containing an infrared absorbing material.
  • the lens on which the coating layer for cutting infrared rays is formed is the third lens L3 as in this embodiment, when the third lens L3 is made of a resin material containing an infrared absorbing material, infrared infrared rays are used.
  • An infrared shielding coating layer is provided on the lens surface of the lens made of an absorption resin material.
  • the lens provided with the infrared blocking coating layer has a shape that is easy to mold without having a large curvature.
  • the lens on which the coating layer for cutting infrared rays is formed is the third lens L3 as in this embodiment, when a lens other than the third lens L3 is made of an infrared absorbing resin material, for example, By using an infrared absorbing resin material for a lens having a smaller volume than the three lenses L3, the cost of the lens can be reduced. Infrared absorbing resin materials generally tend to be more expensive than ordinary optical resin materials.
  • the lens on which the infrared cut coating layer is formed is the third lens L3 as in this embodiment, not only the third lens L3 but also the lenses other than the third lens L3 are made of an infrared absorbing resin material.
  • the effect of blocking infrared rays incident on the image sensor can be enhanced. That is, the greater the length of the infrared absorbing material, the greater the effect of infrared cutting, so that the infrared rays can be blocked almost completely by a plurality of lenses.
  • the infrared cut coating layer is formed on the third lens L3.
  • an infrared cut coating layer may be formed on a lens other than the third lens L3.
  • the imaging lens 10 by providing a coating layer that suppresses transmittance in a wavelength region of 700 nm or more on at least one surface of the lenses L1 to L5, for example, infrared rays are provided between the fifth lens L5 as the final lens and the imaging element 51. Since it is not necessary to arrange a cut filter, the back focus can be shortened, and the imaging lens 10 can be reduced in height.
  • the lens surface having the coating layer satisfies the following conditional expression. 1.5 ⁇ [he 2 /(2.R)]/Sag(he) ⁇ 29 (1)
  • R is the distance on the optical axis AX of the aperture stop S center from the vertex of the surface having the coating layer
  • he is the effective radius of the target surface
  • Sag (he) is the height he at the target surface.
  • the target surface is a surface having a coating layer.
  • the image side is set to +.
  • conditional expression (1) is a conditional expression for achieving good imaging performance while keeping the imaging lens 10 that is an imaging optical system compact.
  • the length from a certain lens surface (for example, the object side surface S41 of the fourth lens L4) to the intersection of the aperture stop S and the optical axis AX is the ideal radius of curvature of the lens surface (for example, R (S41)).
  • the ideal radius of curvature means that if the radius of curvature of the surface shape is R, the angle of incidence of the light beam is reduced by the off-axis ray bundle from the center, and the radius of curvature becomes a shape suitable for the surface to which IR cut coating is applied. Means.
  • Conditional expression (1) expresses by a ratio how much the shape of a lens surface is the same as a spherical shape having an ideal radius of curvature.
  • the sag amount Sag (he) at an effective diameter of a lens surface should be [he 2 / (2 ⁇ R)] if the lens surface has a spherical shape having an ideal radius of curvature. That is, conditional expression (1) represents the ratio of the sag amount when the shape of a certain lens surface is a spherical shape having an ideal radius of curvature and the actual sag amount.
  • the surface to which the IR cut coating is applied is a surface where the degree of concentric with respect to the aperture stop S satisfies the condition (1).
  • conditional expression (1) By exceeding the lower limit value of conditional expression (1), it is possible to prevent the coating surface from being excessively curved, and to make the thickness of the coating film substantially uniform at the center portion (near the optical axis AX) and the peripheral portion of the lens. be able to. Therefore, it is possible to obtain an optical system with good performance in which there is almost no difference in color due to the IR cut effect between the center and the periphery of the subject. In addition, since the degree of bending of the lens does not become too large, it is not necessary to increase the distance between the front and rear optical elements, and the imaging optical system can be made compact.
  • the difference in the incident angle on the coating surface is made as small as possible from the light beam focused on the center of the image sensor 51 to the light beam focused on the periphery. be able to.
  • an imaging optical system that not only has the same color tone at the center and the periphery, but also has good imaging performance with little aberration.
  • the incident angle of light on the lens surface greatly affects the IR cut effect.
  • the IR wavelength region to be cut differs for each image height. The color will be different. Therefore, it is necessary to coat the IR-cut layer on the lens surface having a relatively small incident angle with respect to the light beam that is imaged at any image height that satisfies the conditional expression (1).
  • the imaging lens 10 of the embodiment satisfies the conditional expression (2) already described in addition to the conditional expression (1). 0.2 ⁇ Yd / TTL ⁇ 0.9 (2)
  • Yd is a half value of the diagonal length of the imaging surface of the imaging device
  • TTL is the total length of the imaging lens 10 which is an imaging optical system.
  • the imaging lens 10 When the imaging lens 10 satisfies the conditional expression (2), it is possible to obtain an optical system with good performance in which there is almost no difference in color due to the IR cut effect between the center and the periphery of the subject while being compact. .
  • the conditional expression (2) By falling below the upper limit value of the conditional expression (2), it is possible to prevent the lenses L1 to L5 constituting the imaging lens 10 from being greatly curved, and a coating film is formed between the central portion and the peripheral portion of the lenses L1 to L5. It becomes easy to make the thickness of the film substantially uniform. Therefore, it is possible to obtain an optical system with good performance in which there is almost no difference in color due to the IR cut effect between the center and the periphery of the subject. Moreover, it can be set as the compact imaging lens 10 by exceeding the lower limit of conditional expression (2).
  • imaging lens 10 of the embodiment may further include other optical elements having substantially no power.
  • f focal length of the entire imaging lens
  • Fno F number
  • Yd half value of diagonal length of imaging surface of imaging element
  • TTL total length of imaging lens
  • D Axis upper surface distance
  • Nd Refractive index ⁇ d of lens material with respect to d-line: Abbe number of lens material
  • the surface where “*” is written after each surface number is an aspheric surface .
  • the aspherical shape is expressed by the following “Equation 1” where the vertex of the surface is the origin, the X axis is taken in the direction of the optical axis AX, and the height in the direction perpendicular to the optical axis AX is h.
  • Ai i-order aspheric coefficient
  • R radius of curvature
  • K conic constant
  • Example 1 The lens surface data of Example 1 are shown in Tables 1 and 2 below.
  • infinity is represented as “infinity” and the aperture stop is represented as “STOP”.
  • L (mm) is the distance from the vertex of each surface to the stop
  • R is the distance on the optical axis AX from the vertex of the surface having the coating layer to the center of the aperture stop S
  • he is the effective radius of the target surface
  • Sag (he) is the amount of sag at the height he on the target surface.
  • the aspherical coefficients of the lens surfaces of Example 1 are shown in Table 3 below.
  • a power of 10 for example, 2.5 ⁇ 10 ⁇ 02
  • E for example, 2.5E-02
  • Example 1 The single lens data of Example 1 is shown in Table 4 below.
  • Table 4 Lens Start surface Focal length (mm) 1 1 2.708 2 3 -3.916 3 5 14.194 4 7 2.444 5 9 -1.861
  • FIG. 6 is a cross-sectional view of the imaging lens 11 and the like of the first embodiment.
  • the imaging lens 11 has, in order from the object side, a first lens L1 having a positive refractive power in the vicinity of the optical axis AX and having a convex surface with a convex surface facing the object side, and a negative refractive power in the vicinity of the optical axis AX.
  • a second lens L2 that is nearly plano-concave with the concave surface facing the image side
  • a third lens L3 that is near a flat plate that has almost no refractive power in the vicinity of the optical axis AX, and a positive refractive power in the vicinity of the optical axis AX.
  • a fourth lens L4 having a meniscus shape with a concave surface facing the object side, and a biconcave fifth lens L5 having negative refractive power in the vicinity of the optical axis AX are provided.
  • the image side surface S32 of the third lens L3 is provided with a coating layer that suppresses transmittance in a wavelength region of 700 nm or more.
  • the object side surface S11 of the first lens L1, the object side surface S41 of the fourth lens L4, the object side surface S51 of the fifth lens L5, and the image side surface S52 of the fifth lens L5 also have transmittance in a wavelength region of 700 nm or more. You may provide the coating layer which suppresses. All the lenses L1 to L5 are assumed to be plastic lenses.
  • the third lens L3 is formed of a resin material including an infrared absorbing material that absorbs infrared rays.
  • An aperture stop S is disposed on the object side surface S11 side of the first lens L1.
  • a parallel plate F having an appropriate thickness is disposed between the light exit surface of the fifth lens L5 and the imaging surface (image surface) I.
  • the parallel plate F is assumed to be an optical low-pass filter, a seal glass of a solid-state image sensor, or the like (the same applies to the following examples).
  • FIG. 7A to 7C show spherical aberration, astigmatism, and distortion of the imaging lens 11 of Example 1.
  • FIG. 7A to 7C show spherical aberration, astigmatism, and distortion of the imaging lens 11 of Example 1.
  • FIG. 7A to 7C show spherical aberration, astigmatism, and distortion of the imaging lens 11 of Example 1.
  • FIG. 7A to 7C show spherical aberration, astigmatism, and distortion of the imaging lens 11 of Example 1.
  • the solid line represents the sagittal image plane and the dotted line represents the meridional image plane.
  • Example 2 The single lens data of Example 2 is shown in Table 8 below. [Table 8] Lens Start surface Focal length (mm) 1 1 1.810 2 3 -14.880
  • FIG. 8 is a cross-sectional view of the imaging lens 12 and the like of the second embodiment.
  • the imaging lens 12 has, in order from the object side, a first lens L1 having a positive refractive power near the optical axis AX and a meniscus shape with a convex surface facing the object side, and a negative refractive power near the optical axis AX.
  • a second lens L2 close to a concave plane with the concave surface facing the object side.
  • the object side surface S21 of the second lens L2 is provided with a coating layer that suppresses transmittance in a wavelength region of 700 nm or more.
  • a coating layer that suppresses the transmittance in the wavelength region of 700 nm or more may also be provided on the object side surface S11 of the first lens L1. All the lenses L1 and L2 are assumed to be plastic lenses. Of the lenses L1 and L2, the second lens L2 is formed of a resin material including an infrared absorbing material that absorbs infrared rays. An aperture stop S is disposed on the object side surface S11 side of the first lens L1. Between the light exit surface of the second lens L2 and the imaging surface (image surface) I, a parallel plate F having an appropriate thickness is disposed.
  • FIGS. 9A to 9C show spherical aberration, astigmatism and distortion of the imaging lens 12 of the second embodiment.
  • Example 3 The lens surface data of Example 3 are shown in Table 9 and Table 10 below.
  • Table 9 Surface number R (mm) D (mm) Nd ⁇ d he (mm) Object infinity infinity 1 * 0.938 0.619 1.54480 56.0 0.45 2 * 8.484 0.215 0.49 3 * -1.270 0.512 1.54480 56.0 0.50 4 * -0.805 0.056 0.65 5 * infinity 0.500 1.54480 56.0 0.70 6 * 1.131 0.158 0.88 7 infinity 0.175 1.52310 54.5 0.97 8 infinity 0.100 1.01 9 infinity 0.400 1.52000 62.4 1.04 10 infinity 0.082 1.12 I [Table 10] Surface number L (mm) Sag (he) (mm) [he2 / (2 ⁇ R)] / Sag (he) Object 1 * 0.103 0.107 9.066 2 * -0.517 -0.008 28.093 3 * -0.731 -0.107 1.566 4 * -1.243 -0.143 1.186 5 * -1.299 -0.1
  • FIG. 10 is a cross-sectional view of the imaging lens 13 and the like of the third embodiment.
  • the imaging lens 13 has, in order from the object side, a first lens L1 having a positive refractive power in the vicinity of the optical axis AX and having a convex surface with a convex surface facing the object side, and a positive refractive power in the vicinity of the optical axis AX.
  • a second lens L2 having a meniscus shape with a convex surface facing the image side, and a plano-concave third lens L3 having a negative refractive power near the optical axis AX and having a concave surface facing the image side.
  • the object side surface S21 of the second lens L2 is provided with a coating layer that suppresses transmittance in a wavelength region of 700 nm or more.
  • a coating layer that suppresses transmittance in a wavelength region of 700 nm or more may also be provided on the object side surface S11 of the first lens L1, the image side surface S12 of the first lens L1, and the object side surface S31 of the third lens L3.
  • All the lenses L1 to L3 are assumed to be plastic lenses.
  • the second lens L2 is formed of a resin material containing an infrared absorbing material that absorbs infrared rays.
  • An aperture stop S is disposed on the object side surface S11 side of the first lens L1. Between the light exit surface of the third lens L3 and the imaging surface (image surface) I, a parallel plate F having an appropriate thickness is disposed.
  • FIG. 11A to 11C show spherical aberration, astigmatism, and distortion of the imaging lens 13 of Example 3.
  • FIG. 11A to 11C show spherical aberration, astigmatism, and distortion of the imaging lens 13 of Example 3.
  • the imaging lens 10 is a combination of single lenses, but may be a lens array for a compound eye imaging device in which a plurality of lenses are two-dimensionally arranged.
  • the temperature change of the plastic material can be reduced. More specifically, mixing fine particles with a transparent plastic material generally causes light scattering and lowers the transmittance, making it difficult to use as an optical material. By making the wavelength smaller than this, scattering can be substantially prevented from occurring.
  • the refractive index of the plastic material decreases with increasing temperature, but the refractive index of inorganic particles increases with increasing temperature. Therefore, it is possible to make almost no change in the refractive index by using these temperature dependencies so as to cancel each other.
  • a plastic material with extremely low temperature dependency of the refractive index is obtained.
  • a plastic material with extremely low temperature dependency of the refractive index is obtained.
  • the refractive index change due to temperature change can be reduced.
  • the image point position fluctuation at the time of temperature change of the entire imaging lens system is further reduced. It becomes possible to suppress.
  • a reflow process (heating process) is performed on a substrate on which solder has been potted in advance with an IC chip or other electronic component and an optical element placed on the substrate.
  • a technique has been proposed in which an electronic component and an optical element are simultaneously mounted on a substrate by melting solder.
  • it is necessary to heat the optical element together with the electronic components to about 200 to 260 ° C. Under such a high temperature, the lens using the thermoplastic resin is heated. There is a problem that the optical performance deteriorates due to deformation or discoloration.
  • the imaging lenses 11 to 13 are effective for the reflow process, are easier to manufacture than the glass mold lens, are inexpensive, and can achieve both low cost and mass productivity of the imaging device incorporating the imaging lens. Therefore, the lenses L1 to L5 of Examples 1 to 3 may be formed using the energy curable resin.
  • the energy curable resin generally refers to a thermosetting resin, an ultraviolet curable resin, or the like.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

La présente invention porte sur un système optique d'imagerie qui supprime des effets négatifs de tonalité chromatique dus à des rayons en proche infrarouge sur tous les angles de vision, est compact, et présente une excellente performance de formation d'image. Au moins une surface de lentilles (L1-L5) comporte une couche de revêtement qui supprime une transmittance dans une région de longueur d'onde de 700 nm ou supérieure, et la surface de lentille ayant la couche de revêtement satisfait l'équation (1) conditionnelle suivante. 1. 5 < [he2/(2.R)]/Sag(he) < 29… (1) R étant la distance depuis un sommet de la surface ayant la couche de revêtement vers le centre d'un arrêt (S) d'ouverture sur un axe (AX) optique, he le rayon efficace d'une surface de sujet, et Sag(he) la quantité d'affaissement au niveau de la hauteur he sur la surface de sujet.
PCT/JP2015/051289 2014-01-20 2015-01-19 Système optique d'imagerie, dispositif d'imagerie et terminal mobile WO2015108194A1 (fr)

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WO2017142242A1 (fr) * 2016-02-17 2017-08-24 Samsung Electronics Co., Ltd. Ensemble lentille optique et appareil le comprenant

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JP2007206611A (ja) * 2006-02-06 2007-08-16 Matsushita Electric Ind Co Ltd 単焦点撮像レンズ及びそれを備えた撮像装置
JP2007212877A (ja) * 2006-02-10 2007-08-23 Matsushita Electric Ind Co Ltd 単焦点撮像レンズ及びそれを備えた撮像装置
JP2007212878A (ja) * 2006-02-10 2007-08-23 Matsushita Electric Ind Co Ltd 単焦点撮像レンズ及びそれを備えた撮像装置
JP2008020513A (ja) * 2006-07-11 2008-01-31 Matsushita Electric Ind Co Ltd 単焦点撮像レンズ及びそれを備えた撮像装置
JP2009223251A (ja) * 2008-03-19 2009-10-01 Olympus Corp 撮像装置

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JP2007206611A (ja) * 2006-02-06 2007-08-16 Matsushita Electric Ind Co Ltd 単焦点撮像レンズ及びそれを備えた撮像装置
JP2007212877A (ja) * 2006-02-10 2007-08-23 Matsushita Electric Ind Co Ltd 単焦点撮像レンズ及びそれを備えた撮像装置
JP2007212878A (ja) * 2006-02-10 2007-08-23 Matsushita Electric Ind Co Ltd 単焦点撮像レンズ及びそれを備えた撮像装置
JP2008020513A (ja) * 2006-07-11 2008-01-31 Matsushita Electric Ind Co Ltd 単焦点撮像レンズ及びそれを備えた撮像装置
JP2009223251A (ja) * 2008-03-19 2009-10-01 Olympus Corp 撮像装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017142242A1 (fr) * 2016-02-17 2017-08-24 Samsung Electronics Co., Ltd. Ensemble lentille optique et appareil le comprenant
CN108700726A (zh) * 2016-02-17 2018-10-23 三星电子株式会社 光学镜头组件和具有该镜头组件的设备
US10495849B2 (en) 2016-02-17 2019-12-03 Samsung Electronics Co., Ltd. Optical lens assembly and apparatus having the same
CN108700726B (zh) * 2016-02-17 2021-10-01 三星电子株式会社 光学镜头组件和具有该镜头组件的设备

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