WO2011122357A1 - Système optique de capture d'images et procédé de réglage optique - Google Patents

Système optique de capture d'images et procédé de réglage optique Download PDF

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Publication number
WO2011122357A1
WO2011122357A1 PCT/JP2011/056331 JP2011056331W WO2011122357A1 WO 2011122357 A1 WO2011122357 A1 WO 2011122357A1 JP 2011056331 W JP2011056331 W JP 2011056331W WO 2011122357 A1 WO2011122357 A1 WO 2011122357A1
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WIPO (PCT)
Prior art keywords
lens
lens group
optical system
imaging optical
positive
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Application number
PCT/JP2011/056331
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English (en)
Japanese (ja)
Inventor
治行 中野
昇 滝
宏明 田中
慶二 松坂
Original Assignee
コニカミノルタオプト株式会社
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Priority to CN2011800269188A priority Critical patent/CN103201665A/zh
Publication of WO2011122357A1 publication Critical patent/WO2011122357A1/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 -
    • G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only

Definitions

  • the present invention relates to an imaging optical system that forms an image of a subject on an imaging surface of a solid-state imaging device, and an optical adjustment method for the imaging optical system.
  • imaging devices using solid-state imaging devices such as CCD (Charge Coupled Device) type image sensors and CMOS (Complementary Metal-Oxide Semiconductor) vertical type image sensors have become mobile phones, PDAs (Personal Digital Assistants), etc.
  • an image pickup optical system including, for example, three to five lenses is used due to a demand for high performance and the like.
  • the imaging optical system is an optical system that forms an image of a subject on the imaging surface of the solid-state imaging device.
  • Such an imaging optical system has a demand for autofocusing when mounted on a camera-equipped mobile phone, for example.
  • an imaging optical system is single-focused because the number of lenses is relatively small, and as a focus adjustment method for auto-focusing, an entire extension system that moves all the lenses constituting the imaging optical system Is often adopted.
  • an inner focus system that moves some of the internal lenses as shown in Patent Document 1 is advantageous.
  • the imaging optical system that employs the inner focus method has a mechanism that moves in the optical axis direction for focus adjustment. For this reason, in the inner focus method, the number of mechanical parts increases, and the center position of the lens tends to be decentered in a direction perpendicular to the optical axis.
  • An imaging optical system configured to satisfy the demands for miniaturization and high performance is susceptible to an adverse effect (for example, one-sided blur) due to eccentricity generated during manufacturing.
  • an imaging optical system is a single-focus imaging optical system that forms an image of a subject on an imaging surface of a solid-state imaging device, and in order from the object side to the image side, A first lens group having at least two lenses including a positive lens disposed on the side and having a positive refractive power as a whole, and a second lens group having at least one lens as a whole and having a positive refractive power as a whole A third lens group including at least one lens, wherein the first lens group and the third lens group are fixed with respect to the imaging surface, and the second lens group is used for focus adjustment. It is provided so as to be movable in the optical axis direction and satisfies the following conditional expression. 0.1 ⁇ f1 / fg2 ⁇ 2 However, f1 is the focal length of the positive lens closest to the object, and fg2 is the focal length of the second lens group.
  • the imaging optical system of this configuration is a configuration in which a second lens group disposed between the first lens group and the third lens group is provided so as to be movable in the optical axis direction, and adopts a so-called inner focus method. Yes. For this reason, it is easy to reduce the size and height of the imaging optical system as compared with the case where the entire (all group) feeding system is adopted.
  • the focal length of the positive lens arranged on the most object side and the focal length of the movable second lens group are configured to satisfy a predetermined conditional expression. For this reason, when the imaging optical system is assembled, the decentering of the entire optical system can be easily adjusted by moving the positive lens arranged on the most object side in the direction perpendicular to the optical axis, and the imaging optical system can be downsized. It can be maintained.
  • the first lens group is configured by at least two lenses including a positive lens on the most object side.
  • the first lens group for example, by including at least one negative lens in the first lens group, it is possible to effectively correct the spherical aberration and the axial chromatic aberration. It is easy to improve the optical performance.
  • the imaging optical system of this structure satisfy
  • fg2 is the focal length of the second lens group
  • f is the focal length of the entire imaging optical system.
  • the imaging optical system of this structure satisfy
  • fg1 is the focal length of the first lens group
  • f is the focal length of the entire imaging optical system.
  • the imaging optical system having the above configuration includes a first holding member that holds the first lens group, a second holding member that holds the second lens group, and a third holding that holds the third lens group.
  • the lens holding space of the first holding member is preferably formed such that the diameter in the direction perpendicular to the optical axis is larger than the diameter of the positive lens arranged on the most object side. .
  • the imaging optical system when the imaging optical system is assembled, it is possible to adjust the eccentricity of the entire optical system by moving only the positive lens arranged on the most object side, and the eccentricity can be adjusted efficiently.
  • the positive lens arranged on the most object side is moved in the direction perpendicular to the optical axis to adjust the eccentricity, and further, the first lens group is moved in the optical axis direction. It is also possible to correct field curvature.
  • the first holding member further includes a space portion for arranging an adjustment jig around the lens holding space.
  • a space portion for arranging an adjustment jig around the lens holding space.
  • the first holding member further includes an adhesive filling portion for bonding and fixing a side surface of the positive lens disposed on the most object side, and the space portion includes the adhesive filling portion.
  • the space portion and the adhesive filling portion may be arranged in a circumferential direction of the first holding member so as to be sandwiched.
  • the third lens group includes a negative lens. According to this configuration, the total length of the imaging optical system can be reduced (lower profile) by a so-called telephoto type lens configuration.
  • the optical adjustment method of the present invention is composed of at least two lenses including a positive lens arranged on the most object side in order from the object side to the image side.
  • the third lens group is an optical adjustment method of a single-focus imaging optical system that is fixed with respect to the imaging surface, and the second lens group is provided so as to be movable in the optical axis direction for focus adjustment. It is characterized by comprising an alignment process for adjusting the decentration of the entire optical system by moving the positive lens on the object side in the direction perpendicular to the optical axis.
  • the imaging optical system preferably satisfies the following conditional expression. 0.1 ⁇ f1 / fg2 ⁇ 2
  • f1 is the focal length of the positive lens closest to the object
  • fg2 is the focal length of the second lens group.
  • the optical adjustment method having the above-described configuration further includes an inclination adjustment step of adjusting the inclination of the second lens group, and the alignment step is performed after the inclination adjustment step.
  • the inclination of the second lens group is removed, and the remaining parallel eccentricity (which causes a one-sided blur) is corrected. For this reason, good optical performance can be easily obtained, and optical adjustment can be performed efficiently.
  • position adjustment for moving the first lens group in the optical axis direction may be performed after the alignment step. According to this configuration, both the one-sided blur and the curvature of field can be corrected. Further, in this configuration, not only the positive lens on the most object side but also all the first lens units are moved in the optical axis direction, and there is an advantage that adjustment work is easy.
  • the alignment step may be performed using a solid-state imaging device prepared exclusively for optical adjustment, or may be performed using a solid-state imaging device incorporated as a product. Also good.
  • an imaging optical system having a stable quality can be obtained, and the former method is suitable for, for example, a trader who sells an imaging optical system. Further, according to the latter method, it is possible to obtain an imaging device with good optical characteristics (a device in which a solid-state imaging device is incorporated in an imaging optical system), and the latter method is suitable for a trader who sells imaging devices, for example. is there.
  • the first lens group includes a lens that is different from a positive lens disposed on the most object side and has a first position reference mark, and the third lens.
  • the group includes a lens having a second position reference mark, and when the positive lens arranged on the most object side is observed from the direction along the optical axis before being included in the first lens group,
  • the relative position adjustment of the first lens group and the third lens group may be performed so that the first position reference mark and the second position reference mark coincide with each other.
  • the imaging optical system satisfies the following conditional expression. 0.1 ⁇ fg2 / f ⁇ 2
  • fg2 is the focal length of the second lens group
  • f is the focal length of the entire imaging optical system.
  • an imaging optical system that can be reduced in size and height and can be easily aligned when the imaging optical system is assembled.
  • optical adjustment of the imaging optical system can be performed efficiently. Therefore, according to the present invention, it is possible to provide an image pickup optical system and an image pickup apparatus having good optical characteristics that can be reduced in size and height and suppress one-side blur.
  • Schematic perspective view showing a configuration of an optical unit including the imaging optical system of the present embodiment Schematic exploded perspective view showing the configuration of an optical unit including the imaging optical system of the present embodiment
  • Schematic sectional view of an optical unit including the imaging optical system of the present embodiment The flowchart which shows the assembly procedure of the imaging optical system of this embodiment Schematic sectional view showing a state (first state) during assembly of the imaging optical system of the present embodiment Schematic sectional view showing a state (second state) during assembly of the imaging optical system of the present embodiment
  • FIG. 5 is a schematic cross-sectional view showing a state during the assembly of the imaging optical system of the present embodiment, and is a diagram for explaining a first lens alignment process;
  • the top view of the 1st lens holder of this embodiment when it sees from the top, and the figure showing the state where the 1st lens was inserted in the holder Configuration diagram of the imaging optical system of Example 1 Configuration diagram of the imaging optical system of Example 2 Configuration diagram of the imaging optical system of Example 3 Configuration diagram of the imaging optical system of Example 4 Configuration diagram of image pickup optical system of Embodiment 5 Configuration diagram of the imaging optical system of Example 6 Configuration diagram of the imaging optical system of Example 7 Configuration diagram of imaging optical system of embodiment 8 Configuration diagram of image pickup optical system of Embodiment 9 Configuration diagram of imaging optical system of Example 10 Aberration diagram of Example 1 at infinity object distance Aberration diagram of Example 2 at object distance at infinity Aberration diagram of Example 3 at infinity object distance Aberration diagram of Example 4 at infinity object distance Aberration diagram of Example 5 at infinity
  • FIG. 1 is a schematic perspective view illustrating a configuration of an optical unit including an imaging optical system according to the present embodiment.
  • FIG. 2 is a schematic exploded perspective view showing a configuration of an optical unit including the imaging optical system of the present embodiment.
  • FIG. 3 is a schematic cross-sectional view of an optical unit including the imaging optical system of the present embodiment.
  • the optical unit 10 including the imaging optical system 1 (see FIGS. 1 and 3) of the present embodiment is roughly divided into a first group unit G1, a second group unit G2, and a third group unit G3.
  • the actuator unit A1 is provided.
  • the first unit G1 in order from the object side to the image side, includes a first light shielding plate 11 made of a donut-shaped disk component, a first lens L1, and a second light shielding plate 12 made of a donut-shaped disk component. And the second lens L2, and these are held by the first lens holder (embodiment of the first holding member of the present invention) 13. That is, in the present embodiment, the first lens group LG1 is formed by the first lens L1 and the second lens L2.
  • the first lens holder 13, which is a bottomed plate-shaped member having a substantially disk shape in plan view, has a lens holding space 13a for holding the first lens group LG1 in the thickness direction. In addition, an opening 13 b for allowing light to pass through is formed at the bottom of the first lens holder 13.
  • the first group unit G1 (first lens group LG1) is an imaging surface 70a of a solid-state imaging device 70 (for example, a CCD type image sensor, a CMOS type image sensor, etc .; indicated by a broken line in FIG. 3) attached to the optical unit 10. It is fixed so as not to move.
  • the first lens L1 is a positive lens
  • the second lens is a negative lens
  • the first lens group LG1 including the first lens L1 and the second lens L2 has a positive refractive power as a whole.
  • the first lens group LG1 (the lens group provided in the first group unit G1) has a positive lens (the first lens L1 of the present embodiment) disposed on the most object side, and has a positive refractive power (positive power as a whole). ) May be configured with three or more lenses. In order to effectively correct the spherical aberration and the axial chromatic aberration, it is preferable that the first lens group LG1 includes at least one positive lens and at least one negative lens.
  • a position reference mark M1 is formed at a substantially central portion of the object-side surface of the second lens L2 included in the first lens group LG1, as shown in an enlarged view in FIG. That is, the second lens L2 is a mark lens provided with a position reference mark.
  • the position reference mark M1 is obtained by providing a depression (recess) on the lens surface.
  • Such a position reference mark M1 may be obtained, for example, by cutting the lens surface, or may be obtained by providing a protrusion on a mold for manufacturing the lens.
  • the configuration of the position reference mark M1 is not limited to the configuration of the present embodiment.
  • the position reference mark M1 may be obtained by providing a convex portion on the lens surface, or may be a dot obtained by using an inkjet or the like. There may be.
  • the position reference mark M1 is provided on the object side surface, but may be provided on the image side surface.
  • the position reference mark M1 is preferably formed as small as possible so as not to affect the optical performance of the imaging optical system 1 within a range in which the function as a marker is exhibited.
  • the second group unit G2 includes, in order from the object side to the image side, a third lens L3, a third light-shielding plate 21 made of a donut-shaped disk component, and a fourth lens L4, which are a second lens holder. (Embodiment of the 2nd holding member of this invention) It becomes the structure hold
  • the second lens group LG2 is formed by the third lens L3 and the fourth lens L4.
  • the second lens holder 22 has a cylindrical through space 22a, and the second lens group LG2 is held in the through space 22a.
  • the second group unit G2 (second lens group LG2) can be moved in the optical axis direction (reference numeral AX in FIG. 3 is the optical axis) by an actuator unit A1 described later in detail. That is, the imaging optical system 1 of the present embodiment employs a so-called inner focus method.
  • the second lens group LG2 (lens group provided in the second group unit G2) is configured to have a positive refractive power as a whole.
  • the number of lenses constituting the second lens group LG2 is not limited to the configuration (two) in the present embodiment, and may be one or three or more.
  • the second lens group LG2 is composed of two lenses, for example, the third lens L3 and the fourth lens L4 are both positive lenses, the third lens L3 is a negative lens, and the fourth lens L4 is a positive lens. It's okay.
  • the third group unit G3 includes, in order from the object side to the image side, a fifth lens L5, for example, a filter member 42 made of a parallel plate such as an IR cut filter or an optical low-pass filter, and these are the first frame (holding). Member) 41.
  • the first frame 41 has a space 41a penetrating in the thickness direction so that light can pass in the thickness direction.
  • the third group unit G3 (the third lens group LG3 including the fifth lens L3) is fixed so as not to move with respect to the imaging surface 70a of the solid-state imaging device 70 attached to the optical unit 10, similarly to the first group unit G1. State.
  • the third lens group LG3 is formed only by the fifth lens L5, which is a negative lens.
  • the present invention is not limited to this. That is, the third lens group LG3 may be composed of a plurality of lenses, and may have a positive refractive power or a negative refractive power as a whole. However, it is preferable that the third lens group LG3 includes a negative lens, thereby obtaining a so-called telephoto type configuration and shortening the overall length of the imaging optical system 10 (a reduction in size and height). .
  • a position reference mark M2 is formed at a substantially central portion of the object-side surface of the fifth lens L5 included in the third lens group LG3 as shown in an enlarged view in FIG. That is, the fifth lens L5 is a mark lens provided with a position reference mark.
  • the position reference mark M2 provided on the fifth lens L5 is obtained by providing a recess (concave portion) on the lens surface.
  • the method of forming the position reference mark M2 and the points to be noted are the same as those of the position reference mark M1 provided on the second lens L2.
  • the position reference mark M2 provided on the fifth lens L5 may be changed to another configuration (such as a convex portion or a dot) as in the case of the position reference mark M1 provided on the second lens L2.
  • the actuator unit A1 is a drive mechanism that allows the second group unit G2 (second lens group LG2) to move in the optical axis direction so that the imaging optical system 1 is an inner focus type.
  • This actuator unit A1 is configured using an ultrasonic linear actuator that is referred to as a SIDM (Smooth Impact Drive Mechanism; registered trademark) actuator 31 and is suitable for miniaturization.
  • SIDM Smooth Impact Drive Mechanism; registered trademark
  • the SIDM actuator 31 is bonded and fixed to one end of the SIDM shaft 31a and the SIDM shaft 31a arranged so that the axial direction is parallel to the optical axis direction, and expands and contracts in the axial direction of the SIDM shaft 31a.
  • a weight 31c that is bonded and fixed to the end of the piezoelectric element 31b opposite to the side to which the SIDM shaft 31a is bonded and fixed.
  • a lead wire 32 and a terminal 33 for driving the piezoelectric element 31b are attached to the SIDM actuator 31 by soldering.
  • a drive signal is given to the piezoelectric element 31b via the terminal 33 and the lead wire 32.
  • the piezoelectric element 31b expands and contracts, and the SIDM shaft 31a vibrates in the axial direction due to the expansion and contraction.
  • the second lens holder 22 that is frictionally engaged with the SIDM shaft 31a (this engagement is realized by the leaf spring 23) is moved in the target direction (FIG. 3). (Upward direction or downward direction).
  • the SIDM actuator 31 can move the second lens group LG2 in the optical axis direction.
  • the weight 31c is provided for the purpose of generating displacement due to expansion and contraction of the piezoelectric element 31b only on the side of the SIDM shaft 31a.
  • the single focus / inner focus type imaging of the present embodiment is performed.
  • the optical system 1 optical unit 10) is obtained. Details of the assembly of the imaging optical system 1 (optical unit 10) will be described later.
  • the five lenses L1 to L5 constituting the imaging optical system 1 are all made of a plastic material.
  • these lenses L1 to L5 may be made of glass.
  • the lenses are made of plastic. It is made of material.
  • the lens constituting the imaging optical system 1 is formed of a plastic material. Since the plastic material has a large refractive index change at the time of temperature change, if all the lenses are made of plastic lenses as in this embodiment, the image point position of the imaging optical system 1 fluctuates when the ambient temperature changes. It will have a problem of end. Recently, however, it has been found that mixing inorganic fine particles in a plastic material can reduce the effect of temperature changes on the plastic material.
  • a plastic material with extremely low temperature dependency of the refractive index can be obtained.
  • fine particles of niobium oxide (Nb 2 O 5 ) in an acrylic resin a change in refractive index due to a temperature change can be reduced.
  • the temperature of the imaging optical system 1 is obtained by using a plastic material in which such inorganic particles are dispersed in a positive lens (for example, the first lens L1) having a relatively large refractive power or all the lenses. It is possible to suppress the image point position fluctuation at the time of change to be small.
  • the imaging optical system 1 is comprised so that the following conditional expression (1) may be satisfy
  • fg2 is the focal length of the second lens group LG2
  • f is the focal length of the entire imaging optical system 1.
  • the imaging optical system 1 is configured to satisfy the following conditional expression (2). 0.1 ⁇ f1 / fg2 ⁇ 2 (2)
  • f1 is the focal length of the first lens L1 (the most object side positive lens)
  • fg2 is the focal length of the second lens group LG2.
  • the reason why the conditional expressions (1) and (2) are satisfied in this way is to correct the eccentricity (deviation in the direction perpendicular to the optical axis AX) generated in the lenses L1 to L5 constituting the imaging optical system 1.
  • This is a device for facilitating the adjustment work for obtaining (obtaining good optical characteristics). Details of this will be described in a method for assembling the imaging optical system 1 (optical unit 10) described below.
  • FIG. 4 is a flowchart showing an assembling procedure of the imaging optical system of the present embodiment.
  • assembly of the imaging optical system 1 will be described with reference to FIG.
  • the first group unit G1 is assembled (step S1). Specifically, the second lens L2 and the second light shielding plate 12 are incorporated in the first lens holder 13 in this order. At this time, the second lens L2 is bonded and fixed to the first lens holder 13. At this stage, the first lens L1 and the first light shielding plate 11 are not incorporated into the first lens holder 13.
  • the second group unit G2 is assembled (step S2). Specifically, the fourth lens L4, the third light shielding plate 21, and the third lens L3 are incorporated in the second lens holder 22 in this order. At this time, by applying an adhesive 80 between the third lens L3 and the second lens holder 22, the fourth lens L4, the third light-shielding plate 21, and the third lens L3 are collectively put into the second lens L3. The lens holder 22 is fixed.
  • the third group unit G3 is assembled (step S3).
  • the fifth lens L5 and the filter member 42 are incorporated in the first frame 41.
  • the fifth lens L5 and the filter member 42 are assembled into the first frame 41 from different directions (for example, from the top and bottom in FIG. 3). These incorporated members are each bonded and fixed to the first frame 41 with an adhesive 80.
  • step S4 the assembly of the actuator unit A1 is performed (step S4). Specifically, one end of the SIDM shaft 31a and one end of the piezoelectric element 31b are bonded and fixed, and the other end of the piezoelectric element 31b and one end of the weight 31c are bonded and thereby the SIDM actuator 31 is formed. One end of a lead wire 32 is soldered to each of a pair of electrodes provided on the piezoelectric element 31 b, and a terminal 33 is soldered to the other end of each lead wire 32.
  • steps S1 to S4 are not limited to the order shown here, and may be performed in a different order, or steps S1 to S4 may be performed simultaneously in parallel.
  • the actuator unit A1 is attached to the third group unit G3 (step S5).
  • the lead wire 32 is wound around the fifth lens L5 mounted on the first frame 41, and the terminal 32 is clipped to a predetermined position (see FIG. 1) of the first frame 41. It is almost fixed by the method.
  • the SIDM actuator 31 is provided in the vicinity of one of the four corners of the first frame 41 provided in a substantially rectangular shape in plan view. However, it is not fixed yet, although it is arranged so that its axial direction is substantially parallel to the optical axis AX.
  • the second group unit G2 is engaged with the actuator unit A1 (step S6).
  • the second group unit G2 is provided in the vicinity of one corner of the second lens holder 22 constituting the second group unit G2 (in the vicinity of the corner substantially above the actuator support portion 41b) and a plate provided in a substantially L shape.
  • the spring member 23 is arranged so as to sandwich the SIDM shaft 32a with the tip of one side.
  • the leaf spring member 23 is attached to a boss 22b (see FIG. 2) provided on the second lens holder 22 so that a substantially L-shaped bending point corresponding to a substantially central portion of the leaf spring member 23 can swing.
  • the tip of the other side of the character is attached so as to abut on the second lens holder 22.
  • the second group unit G2 is engaged with the SIDM shaft 31a with a predetermined frictional force and is movable in the axial direction.
  • the second frame 50 is attached to the first frame 41 (step S7).
  • the second frame 50 having a box shape (however, an opening 50a for allowing light to pass through is provided on the upper surface) is configured to be covered with the actuator unit A1 and the second group unit G2. It is attached to the first frame 41.
  • a snap fit mechanism is provided between the first frame 41 and the second frame 50, and the relative position in the optical axis direction of both is fixed without using an adhesive.
  • the relative position in the direction perpendicular to the optical axis AX is fixed by a positioning pin and a positioning hole engaged therewith.
  • FIG. 5 cross-sectional view shows the state (first state) at the end of step S7.
  • the tip of the SIDM shaft 31a of the actuator unit A1 is fitted in a fitting hole 50b provided on the upper surface of the second frame 50. .
  • the weight 31c is not bonded and fixed.
  • the inclination of the second lens group LG2 (second group unit G2) is adjusted (step S8).
  • the inclination of the second lens group LG2 is adjusted by adjusting the position of the weight 31c in a plane perpendicular to the optical axis AX. More specifically, for example, the imaging surface 70a of the solid-state imaging device 70 is arranged in parallel with the imaging surface 70a (the solid-state imaging device 70 is not attached at this stage, and is assumed to be attached). Inclination is adjusted using, for example, an autocollimator or the like so that the reference surface and the edge surface outside the effective surface of the third lens L3 are parallel to each other. At the stage where this tilt adjustment is performed, the weight 31 c is bonded and fixed to the first frame 41 with the adhesive 80.
  • the first group unit G1 (the first lens L1 is not incorporated) is attached to the second frame 50 (step S9).
  • the position of the first lens holder 13 constituting the first group unit G1 is determined by the position reference mark M1 applied to the second lens L2 and the position reference mark M2 applied to the fifth lens L5.
  • the first lens holder 13 is bonded and fixed to the second frame 50 after adjusting so as to match without shifting in the direction perpendicular to the axis.
  • a state (second state) at the end of step S9 is shown in FIG. 6 (cross-sectional view).
  • the lens position adjustment performed so that the position reference mark M1 and the position reference mark M2 coincide may be performed, for example, while simultaneously observing the two marks M1 and M2 along the optical axis direction. Also, for example, by observing the two position reference marks M1 and M2 separately along the optical axis direction, the positions of the marks M1 and M2 in the observation coordinate system are obtained separately, and based on the obtained coordinate positions. Then, the position of the second lens L5 (the position of the first lens holder 13) may be moved so that the positions of the two coincide.
  • the first lens group LG1, the second lens group LG2, and the third lens group LG3 are mounted on separate mechanical components.
  • a large shift shift in a direction perpendicular to the optical axis AX
  • Such misalignment may make it difficult to obtain good optical characteristics during the final optical adjustment of the imaging optical system 1 (optical adjustment using a solid-state imaging device).
  • lens position adjustment is performed using the position reference marks M1 and M2 so that the second lens L2 and the fifth lens L5 are in the correct relative positions.
  • the imaging optical system 1 is configured to satisfy the conditional expression (1) so that the second lens group LG2 is hardly affected even when the second lens group LG2 is in an eccentric state. -ing 0.1 ⁇ fg2 / f ⁇ 2 (1)
  • fg2 is the focal length of the second lens group LG2
  • f is the focal length of the entire imaging optical system 1.
  • the refractive power of the second lens group LG2 does not become too strong, and the above-described position reference mark caused by the eccentricity of the second lens group LG2
  • the image shift of M2 can be suppressed small.
  • the reason why the lower limit of the conditional expression (1) is satisfied is that the refractive power of the second lens group LG2 is appropriately maintained without becoming too weak, thereby shortening the total length of the imaging optical system 1. This is the purpose.
  • the imaging optical system 1 is more preferably configured to satisfy the following conditional expression (1) ′. 0.5 ⁇ fg2 / f ⁇ 1.5 (1) ′
  • step S9 when step S9 is completed, the first lens L1 (positive lens arranged on the most object side) is fixed to the first lens holder 13 (step S10).
  • the first lens L1 is moved in a direction perpendicular to the optical axis AX before being fixed to the first lens holder 13, and its position is adjusted for optical adjustment (alignment process).
  • FIG. 7 is a schematic cross-sectional view showing a state during the assembly of the imaging optical system of the present embodiment, and is a view for explaining the alignment process of the first lens.
  • the solid-state imaging device 70 Prior to the alignment step, as shown in FIG. 7, the solid-state imaging device 70 is disposed behind the first frame 41.
  • the solid-state imaging device 70 may be an adjustment device prepared for optical adjustment or may be used as a product. When used as a product, the solid-state image sensor 70 may be fixed to the first frame 41 at this stage.
  • FIG. 8 is a schematic plan view of the first lens holder according to the present embodiment as viewed from above.
  • the first lens is inserted into the holder (lens holding space 13a (see FIG. 2)). Show.
  • the first lens L1 inserted into the lens holding space 13a can be held by a jig.
  • the jig is composed of, for example, three claw-shaped members, and is configured such that the claw-shaped member inserted into the space portion 13d sandwiches the first lens L1.
  • the diameter of the lens holding space 13a (size in the direction perpendicular to the optical axis AX) is larger than the diameter of the first lens L1. Therefore, a gap SP is formed in a state where the first lens L1 is inserted into the lens holding space 13a, and the first lens L1 held by the jig is in a direction perpendicular to the optical axis AX of the first lens L1. It is movable.
  • the imaging optical system 1 of the present embodiment employs the inner focus method.
  • the inner focus method is an advantageous method for reducing the height of the imaging optical system 1.
  • the number of mechanical parts is increased, and the center position of the lens is increased.
  • Eccentricity that shifts in a direction perpendicular to the optical axis is likely to occur.
  • An imaging optical system configured to satisfy the demands for miniaturization and high performance is susceptible to adverse effects (eg, one-sided blur and axial coma) caused by eccentricity that occurs during manufacturing. For this reason, when the imaging optical system 1 is assembled, alignment (optical adjustment) is performed in order to correct the influence of eccentricity.
  • the lens position adjustment in step S9 may not be performed depending on circumstances, but is preferably performed to facilitate alignment.
  • the imaging optical system 1 is configured to satisfy the conditional expression (2). 0.1 ⁇ f1 / fg2 ⁇ 2 (2)
  • f1 is the focal length of the first lens L1 (the most object side positive lens)
  • fg2 is the focal length of the second lens group LG2.
  • the focal length of the first lens L1 with respect to the second lens group LG2 is prevented from becoming too short by configuring so as to exceed the lower limit of the conditional expression (2).
  • the focal point of the first lens L1 with respect to the second lens group LG2 is prevented from becoming too long.
  • the amount of movement of the first lens L1 from being too large in order to correct the eccentricity of the second lens group LG2 (for alignment), and the adjustment operation can be performed quickly.
  • the value lower than the upper limit of the conditional expression (2) it is possible to prevent the imaging optical system 1 from becoming large in the lens radial direction (direction perpendicular to the optical axis direction).
  • the imaging optical system 1 is more preferably configured to satisfy the following conditional expression (2) ′. 0.5 ⁇ f1 / fg2 ⁇ 1.8 (2) ′
  • the position adjustment of the first lens L1 in the optical axis direction may be performed together. Thereby, it is possible to improve performance not only for one-sided blur but also for field curvature.
  • the first lens holder 13 that is, the first lens group LG1 is moved in the optical axis direction, so that not only one-side blur but also field curvature You may make it aim at improvement. In this case, in step S9, the first lens holder 13 is not bonded and fixed, and the first lens holder 13 needs to be held by the adjustment jig.
  • the imaging optical system 1 is preferably configured to satisfy the following conditional expression (3), and more preferably configured to satisfy the following conditional expression (3) ′.
  • conditional expression (3) 1.0 ⁇ fg1 / f ⁇ 3.0 (3) 1.3 ⁇ fg1 / f ⁇ 2.5 (3) ′
  • fg1 is the focal length of the first lens group LG1
  • f is the focal length of the entire imaging optical system 1.
  • the focal length of the first lens group LG1 becomes appropriate, and a reduction in height and performance is achieved. Realization is possible. Specifically, since the focal length of the first lens group LG1 can be appropriately maintained by configuring the conditional expression (3) (preferably conditional expression (3) ′) to be lower than the upper limit, imaging is performed. The principal point position of the optical system 1 can be arranged closer to the object side, and the overall length of the imaging optical system 1 can be shortened. Further, by configuring so as to exceed the lower limit of conditional expression (3) (preferably conditional expression (3) ′), the focal length of the first lens group LG1 does not become unnecessarily small, and the first lens group LG1. Higher order spherical aberration and coma can be suppressed.
  • conditional expression (3) preferably conditional expression (3) ′
  • step S10 when step S10 is completed, the first light shielding plate 11 is attached to the first lens L1. Further, the cover 60 is placed on the first frame 41 from above to serve also as a countermeasure for electromagnetic wave leakage (step S11). A snap-fit mechanism is provided between the cover 60 and the first frame 41, and the cover 60 is attached to the first frame 41 without being bonded and fixed.
  • the imaging optical system 1 (optical unit 10) of the present embodiment is obtained.
  • the imaging optical system 1 optical unit 10 of the present embodiment is obtained.
  • a preferred embodiment of the imaging optical system 1 will be described.
  • FIGS. 9 to 18 show the configuration (lens configuration) of the imaging optical system of Examples 1 to 10 (EX1 to 10).
  • 9 to 18 are optical cross-sectional views when the imaging optical system 1 is in an infinitely focused state. Further, the movement of the focus group (second lens group LG2) during focusing from infinity to the closest distance is indicated by an arrow mF.
  • the position reference mark M1 is provided on the second lens L2, and in Examples 1 to 5, 8, and 10 (5 lenses), the position reference mark M2 is provided on the fifth lens L5.
  • the fourth lens L4 is provided with a position reference mark M2 on the lens surface.
  • the surface number, the radius of curvature r (mm), the shaft upper surface distance d (mm), and the variable distance at the time of focusing are the closest object distance (object The distance between axis top surfaces dm (mm) at a distance of 10 cm, the refractive index nd for the d line (wavelength: 587.56 nm), the Abbe number vd for the d line, and the effective radius (mm) are shown.
  • the surface with * in the surface number is an aspherical surface, and the surface shape is defined by the following formula (AS) using a local orthogonal coordinate system (X, Y, Z) with the surface vertex as the origin. .
  • AS a local orthogonal coordinate system
  • X, Y, Z a local orthogonal coordinate system with the surface vertex as the origin.
  • the focal length and F number of the entire system values in both the focus state at the infinity object distance (object distance: ⁇ ) and the closest object distance (object distance: 10 cm) are shown.
  • the back focus fB represents the distance from the image side surface of the parallel plate PT (same as the filter member 42) to the image plane IM (same as the imaging surface 70a).
  • the focal length of each lens and each lens group is shown as single lens data and lens group data.
  • Table 1 shows values of the examples corresponding to the respective conditional expressions (conditional expressions (1), (2), and (3)).
  • FIGS. 19 to 28 are aberration diagrams of Examples 1 to 10 (EX1 to 10) at an infinite object distance (object distance: ⁇ ).
  • (A) is a spherical aberration diagram
  • (B) is an astigmatism diagram
  • (C) is a distortion aberration diagram.
  • the spherical aberration diagram shows the amount of spherical aberration for the d-line (wavelength 587.56 nm) indicated by the solid line and the amount of spherical aberration for the g-line (wavelength 435.84 nm) indicated by the broken line in the optical axis AX direction from the paraxial image plane.
  • the amount of deviation (unit: mm) is represented, and the vertical axis represents a value obtained by normalizing the incident height to the pupil by the maximum height (that is, relative pupil height).
  • the broken line T represents the tangential image surface with respect to the d line
  • the solid line S represents the sagittal image surface with respect to the d line, expressed as a deviation amount (unit: mm) in the optical axis AX direction from the paraxial image surface.
  • the vertical axis represents the image height (IMG HT, unit: mm).
  • the horizontal axis represents distortion (unit:%) with respect to the d-line
  • the vertical axis represents image height (IMG HT, unit: mm).
  • the maximum value of the image height IMG HT corresponds to the maximum image height Y ′ on the image plane IM (half the diagonal length of the imaging surface 70a of the solid-state imaging device 70).
  • the imaging optical system 1 of Embodiment 1 includes, in order from the object side, a positive first lens L1, an aperture stop ST, a negative second lens L2, a positive third lens L3, and a positive 4th lens L4 and negative 5th lens L5, and all the lens surfaces are aspherical surfaces.
  • the first lens L1 is a biconvex positive lens
  • the second lens L2 is a negative meniscus lens concave on the image side
  • the third lens L3 is on the object side.
  • the fourth lens L4 is a positive meniscus lens convex to the image side
  • the fifth lens L5 is a negative meniscus lens concave to the image side.
  • first lens L1 and the second lens L2 have a positive refractive power as a whole
  • first lens group LG1 and the third lens L3 and the fourth lens L4 have a positive refractive power as a whole
  • second lens group LG2 has a positive refractive power as a whole
  • the fifth lens L5 constitutes a third lens group LG3 having a negative refractive power as a whole.
  • the imaging optical system 1 of Embodiment 2 includes, in order from the object side, a positive first lens L1, an aperture stop ST, a negative second lens L2, a positive third lens L3, and a positive 4th lens L4 and negative 5th lens L5, and all the lens surfaces are aspherical surfaces.
  • the first lens L1 is a biconvex positive lens
  • the second lens L2 is a negative meniscus lens concave on the image side
  • the third lens L3 is on the object side.
  • the fourth lens L4 is a positive meniscus lens convex to the image side
  • the fifth lens L5 is a negative meniscus lens concave to the image side.
  • first lens L1 and the second lens L2 have a positive refractive power as a whole
  • first lens group LG1 and the third lens L3 and the fourth lens L4 have a positive refractive power as a whole
  • second lens group LG2 has a positive refractive power as a whole
  • the fifth lens L5 constitutes a third lens group LG3 having a negative refractive power as a whole.
  • the imaging optical system 1 (see FIG. 11) of Example 3 includes, in order from the object side, a positive first lens L1, an aperture stop ST, a negative second lens L2, a positive third lens L3, and a positive 4th lens L4 and negative 5th lens L5, and all the lens surfaces are aspherical surfaces.
  • the first lens L1 is a biconvex positive lens
  • the second lens L2 is a negative meniscus lens concave on the image side
  • the third lens L3 is on the object side.
  • the fourth lens L4 is a positive meniscus lens convex to the image side
  • the fifth lens L5 is a negative meniscus lens concave to the image side.
  • first lens L1 and the second lens L2 have a positive refractive power as a whole
  • first lens group LG1 and the third lens L3 and the fourth lens L4 have a positive refractive power as a whole
  • second lens group LG2 has a positive refractive power as a whole
  • the fifth lens L5 constitutes a third lens group LG3 having a negative refractive power as a whole.
  • the imaging optical system 1 (see FIG. 12) of Example 4 includes, in order from the object side, a positive first lens L1, an aperture stop ST, a negative second lens L2, a negative third lens L3, and a positive 4th lens L4 and negative 5th lens L5, and all the lens surfaces are aspherical surfaces.
  • the first lens L1 is a positive meniscus lens convex on the object side
  • the second lens L2 is a negative meniscus lens concave on the image side
  • the third lens L3 is The negative meniscus lens is concave on the image side
  • the fourth lens L4 is a positive meniscus lens convex on the image side
  • the fifth lens L5 is a negative meniscus lens concave on the image side.
  • first lens L1 and the second lens L2 have a positive refractive power as a whole
  • first lens group LG1 and the third lens L3 and the fourth lens L4 have a positive refractive power as a whole
  • second lens group LG2 has a positive refractive power as a whole
  • the fifth lens L5 constitutes a third lens group LG3 having a negative refractive power as a whole.
  • the imaging optical system 1 of Embodiment 5 includes, in order from the object side, a positive first lens L1, an aperture stop ST, a negative second lens L2, a negative third lens L3, and a positive 4th lens L4 and negative 5th lens L5, and all the lens surfaces are aspherical surfaces.
  • the first lens L1 is a biconvex positive lens
  • the second lens L2 is a negative meniscus lens concave on the image side
  • the third lens L3 is on the image side.
  • the fourth lens L4 is a biconvex positive lens
  • the fifth lens L5 is a negative meniscus lens concave on the image side.
  • first lens L1 and the second lens L2 have a positive refractive power as a whole
  • first lens group LG1 and the third lens L3 and the fourth lens L4 have a positive refractive power as a whole
  • second lens group LG2 has a positive refractive power as a whole
  • the fifth lens L5 constitutes a third lens group LG3 having a negative refractive power as a whole.
  • the imaging optical system 1 (see FIG. 14) of Example 6 includes, in order from the object side, an aperture stop ST, a positive first lens L1, a negative second lens L2, a positive third lens L3, and a negative 4th lens L4, and all the lens surfaces are aspherical surfaces.
  • the first lens L1 is a biconvex positive lens
  • the second lens L2 is a negative meniscus lens concave on the image side
  • the third lens L3 is biconvex.
  • the fourth lens L4 is a negative meniscus lens that is concave on the image side.
  • the first lens L1 and the second lens L2 as a whole have a first lens group LG1 having a positive refractive power
  • the third lens L3 has a second lens group LG2 as a whole having a positive refractive power
  • L4 constitutes a third lens group LG3 having a negative refractive power as a whole.
  • the imaging optical system 1 includes, in order from the object side, an aperture stop ST, a positive first lens L1, a negative second lens L2, a positive third lens L3, and a negative 4th lens L4, and all the lens surfaces are aspherical surfaces.
  • the first lens L1 is a biconvex positive lens
  • the second lens L2 is a negative meniscus lens concave on the image side
  • the third lens L3 is on the image side.
  • the fourth lens L4 is a negative meniscus lens that is concave on the image side.
  • the first lens L1 and the second lens L2 as a whole have a first lens group LG1 having a positive refractive power
  • the third lens L3 has a second lens group LG2 as a whole having a positive refractive power
  • L4 constitutes a third lens group LG3 having a negative refractive power as a whole.
  • the imaging optical system 1 of Embodiment 8 includes, in order from the object side, a positive first lens L1, an aperture stop ST, a negative second lens L2, a positive third lens L3, and a positive 4th lens L4 and negative 5th lens L5, and all the lens surfaces are aspherical surfaces.
  • the first lens L1 is a biconvex positive lens
  • the second lens L2 is a negative meniscus lens concave on the image side
  • the third lens L3 is biconvex.
  • the fourth lens L4 is a positive meniscus lens convex on the image side
  • the fifth lens L5 is a negative meniscus lens concave on the image side.
  • first lens L1 and the second lens L2 have a positive refractive power as a whole
  • first lens group LG1 and the third lens L3 and the fourth lens L4 have a positive refractive power as a whole
  • second lens group LG2 has a positive refractive power as a whole
  • the fifth lens L5 constitutes a third lens group LG3 having a negative refractive power as a whole.
  • the imaging optical system 1 includes, in order from the object side, an aperture stop ST, a positive first lens L1, a negative second lens L2, a positive third lens L3, and a negative 4th lens L4, and all the lens surfaces are aspherical surfaces.
  • the first lens L1 is a biconvex positive lens
  • the second lens L2 is a negative meniscus lens concave on the image side
  • the third lens L3 is on the image side.
  • the fourth lens L4 is a negative meniscus lens that is concave on the image side.
  • the first lens L1 and the second lens L2 as a whole have a first lens group LG1 having a positive refractive power
  • the third lens L3 has a second lens group LG2 as a whole having a positive refractive power
  • L4 constitutes a third lens group LG3 having a negative refractive power as a whole.
  • the imaging optical system 1 (see FIG. 18) of Example 10 includes, in order from the object side, a positive first lens L1, an aperture stop ST, a negative second lens L2, a negative third lens L3, and a positive 4th lens L4 and negative 5th lens L5, and all the lens surfaces are aspherical surfaces.
  • the first lens L1 is a biconvex positive lens
  • the second lens L2 is a biconcave negative lens
  • the third lens L3 is a concave negative lens on the image side.
  • the fourth lens L4 is a biconvex positive lens
  • the fifth lens L5 is a biconcave negative lens.
  • the first lens L1, the second lens L2, and the third lens L3 have a first lens group LG1 having a positive refractive power as a whole, and the fourth lens L4 has a second lens group LG2 having a positive refractive power as a whole.
  • the fifth lens L5 constitutes a third lens group LG3 having a negative refractive power as a whole.
  • the imaging optical systems of Examples 1 to 10 exhibit good aberration characteristics.
  • all of Examples 1 to 10 satisfy the conditional expressions (1), (2), and (3). That is, according to the present invention, an imaging optical system having good optical characteristics can be obtained with high accuracy and efficiency.
  • the principal ray incident angle of the light beam incident on the imaging surface 70a of the solid-state imaging device 70 is not necessarily designed to be sufficiently small in the periphery of the imaging surface 70a.
  • it has become possible to reduce shading by reviewing the arrangement of the color filters of the solid-state imaging device and the on-chip microlens array.
  • each of the above-described embodiments is a design example aimed at further miniaturization.
  • the position reference mark is provided in the lens center.
  • the position where the position reference mark is provided is not limited to this position.
  • the position reference mark may have the configuration shown in the present embodiment, or may have a ring shape or the like.
  • the present invention is suitable for an imaging optical system that forms an image of a subject on the imaging surface of a solid-state imaging device.

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

Abstract

La présente invention a trait à un système optique de capture d'images (1) qui est muni, dans l'ordre, depuis le côté objet jusqu'au côté image : d'un premier groupe de lentilles (LG1) qui est composé d'au moins deux lentilles, y compris une lentille positive (première lentille (L1)) disposée au plus près de l'objet, et qui présente une réfringence positive dans son ensemble ; d'un deuxième groupe de lentilles (LG2) qui est composé d'au moins une lentille et qui présente une réfringence positive dans son ensemble ; et d'un troisième groupe de lentilles (LG3) qui est composé d'au moins une lentille. Le premier groupe de lentilles (LG1) et le troisième groupe de lentilles (LG3) sont fixés à une surface de capture d'images (70a), le deuxième groupe de lentilles (LG2) est conçu pour être mobile dans la direction de l'axe optique en vue de la mise au point, et le système optique de capture d'images (1) satisfait à l'expression conditionnelle 0,1 < f1/fg2 < 2, où f1 est la distance du point focal de la lentille positive la plus proche de l'objet et fg2 est la distance du point focal du deuxième groupe de lentilles.
PCT/JP2011/056331 2010-03-29 2011-03-17 Système optique de capture d'images et procédé de réglage optique WO2011122357A1 (fr)

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CN105445885B (zh) * 2015-10-30 2019-06-18 宁波舜宇光电信息有限公司 可调光学镜头和摄像模组及其制造方法
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CN109425954B (zh) * 2017-08-22 2021-04-09 玉晶光电(厦门)有限公司 光学成像镜头
JP2019096637A (ja) * 2017-11-17 2019-06-20 株式会社小糸製作所 レーザー光源ユニット
CN110320627B (zh) * 2018-03-30 2024-06-18 日本电产三协（东莞）工机有限公司 透镜单元和该透镜单元的制造方法
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