WO2011092984A1 - Objectif de capture d'image, dispositif de capture d'image et terminal portatif - Google Patents

Objectif de capture d'image, dispositif de capture d'image et terminal portatif Download PDF

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Publication number
WO2011092984A1
WO2011092984A1 PCT/JP2010/073144 JP2010073144W WO2011092984A1 WO 2011092984 A1 WO2011092984 A1 WO 2011092984A1 JP 2010073144 W JP2010073144 W JP 2010073144W WO 2011092984 A1 WO2011092984 A1 WO 2011092984A1
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WIPO (PCT)
Prior art keywords
lens
imaging
image
imaging lens
conditional expression
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PCT/JP2010/073144
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English (en)
Japanese (ja)
Inventor
雄一 尾崎
貴志 川崎
一生 松井
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コニカミノルタオプト株式会社
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Publication of WO2011092984A1 publication Critical patent/WO2011092984A1/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
    • G02B13/003—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having two lenses

Definitions

  • the present invention is small and thin, and an imaging lens suitable for an imaging apparatus using a solid-state imaging device such as a CCD (Charged Coupled Device) type image sensor or a CMOS (Complementary Metal Oxide Semiconductor) type image sensor.
  • a solid-state imaging device such as a CCD (Charged Coupled Device) type image sensor or a CMOS (Complementary Metal Oxide Semiconductor) type image sensor.
  • the present invention relates to an imaging apparatus used, and a portable terminal including the imaging apparatus.
  • a two-lens imaging lens has been proposed because it can be miniaturized and can have higher performance than a single-lens lens.
  • a lens for forming a subject image on these image pickup elements a lens made of a resin suitable for mass production has been used for further cost reduction.
  • a lens made of resin has good workability, and it has also responded to the demand for higher performance by making it an aspherical shape.
  • a lens having a two-lens structure is disclosed in a patent publication (see Patent Documents 1 and 2).
  • An image pickup apparatus using a small solid-state image pickup device such as a 1/10 inch size or a 1/12 inch size is often used particularly for a small or thin mobile phone or the like. Therefore, further downsizing is required rather than the size proportionally reduced in accordance with the above.
  • a general method for reducing the height of the imaging lens is to shorten the back focus by a lens configuration such as a telephoto type.
  • the back focus is shortened to reduce the height, the distance between the solid-state imaging device and the imaging lens is shortened, so that the light beam that forms an image on the periphery of the imaging surface of the solid-state imaging device passes outside the imaging lens.
  • the outer diameter of the imaging lens becomes large. Therefore, in order to reduce the size of the imaging apparatus, it is necessary to design the back focus to some extent while suppressing the overall length.
  • the imaging lens disclosed in Patent Document 1 is a telephoto type in which the first lens has a positive refractive power and the second lens has a negative refractive power. There is a problem that the back focus necessary for the solid-state imaging device cannot be secured.
  • the imaging lens disclosed in Patent Document 2 has a positive refractive power and a second lens having a positive refractive power, so that the back focus is secured, but the second lens is a biconvex lens. For this reason, there is a problem that correction of Petzval sum is insufficient and curvature of field is large.
  • the present invention has been made in view of such problems, and is a two-lens imaging lens in which various aberrations are favorably corrected while corresponding to a 1/10 inch size or 1/12 inch size solid-state imaging device,
  • An object of the present invention is to provide an imaging device using the imaging lens and a portable terminal including the imaging device.
  • any mobile phone manufacturer has demanded that an imaging apparatus using a two-lens configuration has a total length of 3.0 mm or less.
  • the solid-state imaging device needs to have a thickness of 0.3 mm and the thickness of the cover member that protects the front surface of the imaging lens needs to be 0.2 mm.
  • the present invention is not limited by the conditional expressions (7) to (9).
  • Fno F number of the imaging lens
  • P Pixel pitch of the solid-state imaging device
  • TTL Distance on the optical axis from the most object side lens surface of the entire imaging lens system to the image side focal point (however, “image side focal point” (This is the image point when a parallel ray parallel to the optical axis is incident on the imaging lens.)
  • An imaging lens for forming a subject image on a photoelectric conversion unit of a solid-state imaging device In order from the object side, an aperture stop, a first lens having a positive refractive power and a meniscus shape with a convex surface facing the object side, and a meniscus shape having a positive refractive power and a convex surface facing the object side A second lens and a parallel plate element; An imaging lens satisfying the following conditional expression:
  • the basic configuration of the present invention for obtaining an image pickup lens in which aberrations are favorably corrected corresponding to a small solid-state image pickup device is, in order from the object side, an aperture stop and a positive refraction. It comprises a meniscus first lens having a force and a convex surface facing the object side, a meniscus second lens having a positive refractive power and a convex surface facing the object side, and a parallel plate element.
  • the first lens having a positive refractive power By making the first lens having a positive refractive power into a meniscus shape having a convex surface facing the object side, the negative refractive power on the image side surface is strengthened while maintaining the positive refractive power in the entire imaging lens system.
  • the Petzval sum can be reduced.
  • the second lens since the second lens has a positive refractive power, the principal point of the entire imaging lens system can be brought to the image side, so that back focus can be ensured.
  • the aperture stop on the most object side and making the object side surface of the second lens convex on the object side, it is possible to effectively reduce the luminous flux jumped up on the image side surface of the first lens.
  • the chief ray incident angle (the angle between the chief ray and the optical axis) of the light beam that forms an image on the periphery of the image sensing surface of the image sensor can be kept small, and so-called telecentric characteristics can be secured.
  • even when a mechanical shutter is required it is possible to obtain an imaging lens having a short overall length because it can be arranged closest to the object side.
  • the negative refractive power becomes strong and the Petzval sum can be reduced.
  • Conditional expression (1) defines the focal length of the entire imaging lens system. With the downsizing of solid-state image sensors, 1 / 10-inch and 1 / 12-inch size solid-state image sensors have been commercialized, and it is considered that in the future, 1/15 inch-size solid-state image sensors will be developed. It is done. In recent years, many mobile phone manufacturers have demanded an imaging lens having a solid-state imaging device with a horizontal angle of view of about 50 to 60 degrees. On the other hand, by exceeding the lower limit value of conditional expression (1), it is possible to cope with an imaging lens using a solid-state imaging device having a horizontal angle of view of about 50 to 60 degrees and a size larger than 1/15 inch size. it can. On the other hand, by falling below the upper limit value of conditional expression (1), it is possible to cope with an imaging lens using a solid-state imaging device having a horizontal field angle of about 50 to 60 degrees and a size smaller than 1/10 inch. .
  • Conditional expression (2) defines the ratio between the parallel plate element and the focal length.
  • both the first lens and the second lens have positive refracting power, and thus the image side surface has negative refracting power, but the occurrence of curvature of field due to insufficient correction of Petzval sum becomes a problem.
  • the conditional expression (2) defines the ratio between the parallel plate element and the focal length.
  • Conditional expression (3) defines the ratio of the focal lengths of the second lens and the first lens.
  • Conditional expression (4) defines the ratio between the axial thickness of the first lens and the focal length.
  • Conditional expression (5) defines the ratio of the radius of curvature and the focal length of the image side of the first lens.
  • the image side surface of the first lens becomes a strong divergent surface, the Petzval sum can be kept small, and the curvature of field can be corrected.
  • the lower limit of conditional expression (5) is exceeded, the luminous flux jumps down, so that the occurrence of higher-order aberrations such as coma flare can be suppressed.
  • n1 Refractive index of the d-line of the first lens
  • Conditional expression (6) defines the refractive index of the d-line of the first lens. Since both the first lens and the second lens have positive refractive power, the Petzval sum can be reduced by exceeding the lower limit value of the conditional expression (6). On the other hand, it can comprise with the easily available glass material by being less than the upper limit of conditional expression (6).
  • the negative refracting power of the image side surface of the second lens decreases from the optical axis to the periphery, so that it becomes easy to ensure the telecentric characteristics of the image-side light beam.
  • the refractive power of the periphery may become positive because the image side surface of the second lens has an inflection point in the periphery.
  • the image side surface of the first lens does not need to weaken the negative refractive power excessively in the peripheral portion of the lens, and the off-axis aberration can be corrected well.
  • the peripheral refractive power ⁇ is the tilt angle after passing through the target lens surface when a parallel light beam is incident from infinity on the object side to the optical axis height H of the light beam on the target lens surface as ⁇ . Then, it is given by the following mathematical formula (reference document: Japanese Patent Application Laid-Open No. 2004-4326097).
  • ⁇ tan ⁇ / H 7).
  • the material having heat resistance is preferably a material that does not deform at 260 ° C. or higher, which is the internal temperature of the reflow bath.
  • the choice of lens materials increases, and high performance is facilitated. Furthermore, it is possible to suppress image point position fluctuations during temperature changes in the entire imaging lens system.
  • the plastic lens can be configured without being exposed to the outside, so that problems such as damage to the first lens can be avoided.
  • the optical performance when exposed to high temperatures is small compared to lenses using a thermoplastic resin such as polycarbonate or polyolefin.
  • a thermoplastic resin such as polycarbonate or polyolefin.
  • the energy curable resin refers to both a thermosetting resin and an ultraviolet curable resin.
  • Dispersion of inorganic fine particles of 30 nanometers or less in at least one of the first lens and the second lens made of a resin material reduces performance deterioration and image point position fluctuations even when the temperature changes.
  • the size of the fine particles should be smaller than the wavelength of the transmitted light beam. Thus, substantially no scattering can occur.
  • 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. Specifically, by dispersing inorganic particles of 30 nanometers or less in the plastic 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 as the temperature rises
  • inorganic particles whose refractive index increases as the temperature rises are dispersed in the resin material as the base material, these properties will cancel each other. It is also known that the refractive index change with respect to the temperature change can be reduced. On the other hand, it is also known that when the inorganic particles whose refractive index decreases as the temperature rises are dispersed in the resin material as the base material, the refractive index change with respect to the temperature change can be increased.
  • inorganic particles of 30 nanometers or less in the plastic 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 temperature change A of the refractive index is expressed by the following formula by differentiating the refractive index n by the temperature t based on the Lorentz-Lorentz equation.
  • the contribution of the second term of the above formula is substantially increased, so as to cancel out the change due to the linear expansion of the first term. .
  • the mixing ratio can be appropriately increased or decreased in order to control the rate of change of the refractive index with respect to the temperature, and a plurality of types of nano-sized inorganic particles can be blended and dispersed.
  • the lens forming the infrared cut coat is formed of a glass material.
  • the problem that a cutoff wavelength will shift to a short wavelength side will arise if the incident angle of the light ray to the surface in which the infrared cut coat was formed becomes large, it is more desirable to satisfy the following conditional expressions.
  • nc Refractive index of d-line of the light incident side medium on the lens surface on which the infrared cut coat is formed
  • ⁇ max Maximum incident angle of the principal ray on the lens surface on which the infrared cut coat is formed
  • first lens block having a plurality of the first lenses arranged in an array and a second lens block having a plurality of the second lenses arranged in an array; With the first lens and the second lens facing each other, the periphery of the optical surface of the first lens and the periphery of the optical surface of the second lens are respectively bonded, and the first lens block and the Integrating the second lens block; Cutting the integrated first lens block and the second lens block for each of the first lens and the second lens.
  • the imaging lens according to any one of the above.
  • a portable terminal comprising the imaging device according to 13.
  • an imaging device using the imaging lens and a portable terminal equipped with the imaging device, a solid image having a 1/10 inch size or a 1/12 inch size using a two-lens imaging lens.
  • Various aberrations can be favorably corrected while corresponding to the image sensor.
  • FIG. 6 is an aberration diagram of Example 1.
  • 6 is a cross-sectional view of an imaging lens of Example 2.
  • FIG. 6 is an aberration diagram of Example 2.
  • 6 is a cross-sectional view of an imaging lens of Example 3.
  • FIG. 6 is an aberration diagram of Example 3.
  • 6 is a cross-sectional view of an imaging lens of Example 4.
  • FIG. 6 is an aberration diagram of Example 4. It is a graph when the horizontal axis is conditional expression (2) and the vertical axis is astigmatic difference. It is a graph when the horizontal axis is conditional expression (2) and the vertical axis is conditional expression (9).
  • the imaging lens includes, in order from the object side, an aperture stop S, a first lens L1 having a positive refractive power and a meniscus shape having a convex surface facing the object side, and a convex surface having positive refractive power and the object side. And a parallel plate element F made of an optical low-pass filter, an IR cut filter, or a seal glass of a solid-state image sensor.
  • the above optical members are held by the lens frame 11, and the aperture stop S is formed integrally with the lens frame 11.
  • the image pickup device C having an imaging surface for forming a subject image is mounted on the printed wiring board 12, and the printed wiring board 12 is fixed to the lens frame 11.
  • the imaging device is configured as described above.
  • FIG. 2A is a view of the folded mobile phone as viewed from the inside
  • FIG. 2B is a view of the folded mobile phone as viewed from the outside.
  • an upper casing 71 as a case having display screens D1 and D2 and a lower casing 72 having operation buttons B are connected via a hinge 73.
  • the camera module is built under the display screen D2 in the upper casing 71, and the first lens L1 of the imaging lens is exposed on the outer surface of the upper casing 71.
  • this imaging device may be arranged above or on the side of the display screen D2 in the upper casing 71. Further, the mobile phone T is not limited to a folding type.
  • FIG. 3A a first lens block LB1 in which a plurality of first lenses L1 are arranged in an array is formed.
  • FIG. 3A is a cross-sectional view of the first lens block LB1.
  • FIG. 3B is a cross-sectional view of the second lens block LB20.
  • the first lens block LB1 and the second lens block LB2 are arranged so that the first lens L1 and the second lens L2 face each other, and the first lens is in that state.
  • the periphery of the optical surface of L1 and the periphery of the optical surface of the second lens L2 are joined with an adhesive G, respectively, so that the first lens block LB1 and the second lens block LB2 are integrated.
  • the position indicated by the alternate long and short dash line is cut with a cutter, and a large amount of the first lens L1 and the second lens L2 are separated from the integrated first lens block LB1 and second lens block LB2.
  • the first lens block LB1 and the first lens block LB1 are provided with a large number of first lenses L1 and second lenses L2 not only in the horizontal direction on the paper but also in the vertical direction. Accordingly, when viewed from above in FIG. 3C, the lens surfaces are cut in two orthogonal directions, and the lens surfaces of the first lens L1 and the second lens L2 are circular, but the outer shape is rectangular.
  • imaging lenses capable of forming highly accurate images can be mass-produced at low cost.
  • f Focal length of the entire imaging lens system fB: Back focus
  • F F number 2Y: Diagonal length of the imaging surface of the solid-state imaging device
  • ENTP Entrance pupil position (distance from the first surface to the entrance pupil position)
  • EXTP exit pupil position (distance from imaging surface to exit pupil position)
  • H1 Front principal point position (distance from the first surface to the front principal point position)
  • H2 Rear principal point position (distance from the final surface to the rear principal point position)
  • R radius of curvature
  • D axial top surface spacing
  • Nd refractive index of lens material with respect to d-line
  • ⁇ d Abbe number of lens material
  • the surface where “*” is written after each surface number is aspherical
  • the shape of the aspherical surface is represented by the following formula, where the vertex of the surface is the origin, the X-axis is taken in the optical axis direction, and the height in the direction perpendicular to the optical axi
  • FIG. L1 is a first lens
  • L2 is a second lens
  • S is an aperture stop
  • F is a parallel plate element
  • I is an imaging surface.
  • F is a parallel flat plate such as an optical low-pass filter, an IR cut filter, or a seal glass of a solid-state image sensor.
  • FIG. 5 is an aberration diagram of Example 1 (spherical aberration, astigmatism, distortion, and meridional coma).
  • the solid-state imaging device in the present embodiment is assumed to be a CMOS image sensor of 1/12 inch, 640 ⁇ 480 pixels, and a pixel pitch of 1.75 ⁇ m.
  • all the lenses are formed of glass mold lenses, and an infrared cut coat is formed on the object side surface of the first lens.
  • the film configuration of the infrared cut coat is shown in the following table.
  • the first layer is the incident medium side
  • the 44th layer is the output medium side.
  • the design half-value wavelength is 650 nm.
  • L1 is a first lens
  • L2 is a second lens
  • S is an aperture stop
  • F is a parallel plate element
  • I is an imaging surface.
  • F is a parallel flat plate such as an optical low-pass filter, an IR cut filter, or a seal glass of a solid-state image sensor.
  • FIG. 7 is an aberration diagram of Example 2 (spherical aberration, astigmatism, distortion, and meridional coma).
  • the solid-state imaging device in the present embodiment is assumed to be a CMOS image sensor of 1/10 inch, 640 ⁇ 480 pixels, and a pixel pitch of 2.2 ⁇ m.
  • all the lenses are formed of glass mold lenses, and an infrared cut coat is formed on the object side surface of the first lens.
  • FIG. 8 is a sectional view of the lens of Example 3.
  • L1 is a first lens
  • L2 is a second lens
  • S is an aperture stop
  • F is a parallel plate element
  • I is an imaging surface.
  • F is a parallel flat plate such as an optical low-pass filter, an IR cut filter, or a seal glass of a solid-state image sensor.
  • FIG. 9 is an aberration diagram of Example 3 (spherical aberration, astigmatism, distortion, and meridional coma).
  • the solid-state imaging device in the present embodiment is assumed to be a CMOS image sensor of 1/12 inch, 640 ⁇ 480 pixels, and a pixel pitch of 1.75 ⁇ m.
  • all the lenses are formed of glass mold lenses, and an infrared cut coat is formed on the object side surface of the first lens.
  • FIG. 10 is a sectional view of the lens of Example 4.
  • L1 is a first lens
  • L2 is a second lens
  • S is an aperture stop
  • F1 is a parallel plate element
  • F2 is a parallel plate assuming a sealing glass of a solid-state image sensor
  • I is an imaging surface.
  • F1 is a parallel plate such as an optical low-pass filter or an IR cut filter.
  • FIG. 11 is an aberration diagram of Example 4 (spherical aberration, astigmatism, distortion, and meridional coma).
  • the solid-state imaging device in the present embodiment is assumed to be a CMOS image sensor of 1/10 inch, 640 ⁇ 480 pixels, and a pixel pitch of 2.2 ⁇ m.
  • all the lenses are formed of glass mold lenses, and an infrared cut coat is formed on the object side surface of the first lens.
  • MTF Modulation Transfer Function
  • a spatial frequency that is 1/2 of the Nyquist frequency in a VGA image format (number of effective pixels: 640 ⁇ 480) sensor (143 lp / mm if the pixel pitch is 1.75 ⁇ m, 2.
  • MTF is calculated under the condition that the wavelength d-line, F-line, and C-line are 1: 1: 1 each, and the focus positions of the sagittal ray and the meridional ray are between the on-axis and the outermost periphery.
  • the value at the farthest is the astigmatic difference in the embodiment.
  • both the sagittal and meridional image planes must be within ⁇ Fno ⁇ ⁇ with respect to the focal plane. It is possible to judge whether the astigmatism value is within the value of Fno ⁇ ⁇ as a condition almost corresponding to it.
  • the thickness of the second lens is too thick, the degree of freedom of the image side surface of the second lens is reduced, and the astigmatism difference is approximately 2.9 times as large as Fno ⁇ ⁇ , and the optical performance necessary for the imaging lens is not sufficiently satisfied. I understand.
  • FIG. 13 shows a graph when the horizontal axis is conditional expression (2) and the vertical axis is conditional expression (9).
  • the secured back focus is used to secure the thickness of the parallel plate, but the influence on the optical performance of dust attached to the autofocus unit or correction unit or the image pickup lens is suppressed. May be used for this purpose.

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

Abstract

La présente invention concerne un objectif de capture d'image composé de deux lentilles, l'objectif de capture d'image intégrant des éléments de capture d'image transistorisés de 1/10 et 1/12 de pouce et ses aberrations étant corrigées de manière satisfaisante. D'après la présente invention, un objectif de capture d'image est conçu pour permettre à une section de conversion photoélectrique d'un élément de capture d'image transistorisé de former une image d'un objet, l'objectif de capture d'image comprenant, dans l'ordre depuis le côté objet : un diaphragme d'ouverture ; une première lentille en forme de ménisque qui présente une réfringence positive et possède une surface convexe orientée vers le côté objet ; une seconde lentille en forme de ménisque qui présente une réfringence positive et possède une surface convexe orientée vers le côté objet ; et un élément formant une plaque plate parallèle, l'objectif de capture d'image satisfaisant les formules conditionnelles suivantes : 0,70 mm < f < 1,60 mm, et 0,25 < dc/f < 0,50, où dc est l'épaisseur de l'élément formant une plaque plate parallèle (s'il est utilisé de multiples éléments formant des plaques plates parallèles, la valeur dc est égale à la somme des épaisseurs), et f est la longueur focale de l'ensemble du système de l'objectif de capture d'image.
PCT/JP2010/073144 2010-01-27 2010-12-22 Objectif de capture d'image, dispositif de capture d'image et terminal portatif WO2011092984A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114488490A (zh) * 2022-03-04 2022-05-13 广东烨嘉光电科技股份有限公司 一种大数值孔径的两片式投影镜头

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Publication number Priority date Publication date Assignee Title
JP2003329922A (ja) * 2002-05-10 2003-11-19 Seiko Epson Corp 撮像レンズ
JP2004177976A (ja) * 2004-01-16 2004-06-24 Milestone Kk 撮像レンズ
JP2005037764A (ja) * 2003-07-17 2005-02-10 Olympus Corp 撮像光学系及びそれを用いた撮像装置
JP2005107368A (ja) * 2003-10-01 2005-04-21 Fujinon Corp 単焦点レンズ
JP2006189586A (ja) * 2005-01-05 2006-07-20 Nippon Zeon Co Ltd 撮像レンズ
JP3146386U (ja) * 2008-05-28 2008-11-13 一品光学工業股▲ふん▼有限公司 ２つのレンズ片光学像取得レンズ
JP2009198872A (ja) * 2008-02-22 2009-09-03 Konica Minolta Opto Inc 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

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003329922A (ja) * 2002-05-10 2003-11-19 Seiko Epson Corp 撮像レンズ
JP2005037764A (ja) * 2003-07-17 2005-02-10 Olympus Corp 撮像光学系及びそれを用いた撮像装置
JP2005107368A (ja) * 2003-10-01 2005-04-21 Fujinon Corp 単焦点レンズ
JP2004177976A (ja) * 2004-01-16 2004-06-24 Milestone Kk 撮像レンズ
JP2006189586A (ja) * 2005-01-05 2006-07-20 Nippon Zeon Co Ltd 撮像レンズ
JP2009198872A (ja) * 2008-02-22 2009-09-03 Konica Minolta Opto Inc 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
JP3146386U (ja) * 2008-05-28 2008-11-13 一品光学工業股▲ふん▼有限公司 ２つのレンズ片光学像取得レンズ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114488490A (zh) * 2022-03-04 2022-05-13 广东烨嘉光电科技股份有限公司 一种大数值孔径的两片式投影镜头

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