WO2005057264A1 - レンズ系およびその組立方法 - Google Patents
レンズ系およびその組立方法 Download PDFInfo
- Publication number
- WO2005057264A1 WO2005057264A1 PCT/JP2004/018849 JP2004018849W WO2005057264A1 WO 2005057264 A1 WO2005057264 A1 WO 2005057264A1 JP 2004018849 W JP2004018849 W JP 2004018849W WO 2005057264 A1 WO2005057264 A1 WO 2005057264A1
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- WO
- WIPO (PCT)
- Prior art keywords
- lens
- optical axis
- lenses
- lens system
- reference plane
- Prior art date
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
Definitions
- the present invention relates to a lens system including at least two lenses having a reference plane for optical axis alignment and a method of assembling the same.
- the following method has been proposed as a method for adjusting the optical axis of a lens system having a plurality of lenses.
- the whole is cooled, and the lens frame is fixed using the holding member in this state, and the optical axis is adjusted by cooling, thereby improving image distortion due to misalignment of the optical axis.
- the fitting part of the lens holding ring is the inner wall of the lens barrel.
- Fig. 8 shows the configuration of a conventional lens system that does not use a lens frame.
- the lens periphery and the inner diameter of the lens barrel 2 have been used to align the optical axes of the plastic lenses 901 and 902.
- the eccentricity between the lens periphery and the lens surface needs to be accurately built.
- align the lens periphery so that the lens does not move in the lens barrel, and adjust the distance between the inner surface of the lens barrel 905 and the lens periphery.
- the outer peripheral portion of the lens is often not perpendicular to the lens surface but is drafted in the case of injection molding in order to reduce the mold release resistance.
- the draft is the slope of the cone when the cylindrical shape formed by the flat part other than the lens surface, perpendicular to the optical axis, of the lens outer peripheral part and the lens is conical.
- Draft is often in the range of 3 to 5 degrees.
- the lens is mainly made of resin and has resin elasticity, the lens may be press-fitted while utilizing this elasticity when inserting the lens into the lens barrel.
- the lens does not tilt if the barrel fits into the plane of the cooper section, but if the inside diameter of the barrel fits the conical shape of the lens outer periphery, lens eccentricity will occur and lens tilt will also occur.
- the eccentricity between the lens peripheral portion and the lens surface needs to be accurately manufactured, and the manufacturing cost and man-hours are increased.
- the lens system according to the present invention comprises: a first lens having at least one reference surface at a constant angle with respect to the optical axis on the outer peripheral portion; and a first lens having a constant angle with respect to the optical axis at the outer peripheral portion. And a second lens having two reference planes, and the corresponding reference planes of the first lens and the second lens are adjusted so that the optical axis of the first lens and the optical axis of the second lens coincide. It does not require a lens barrel for optical axis alignment.
- the lens system according to an embodiment of the present invention further includes at least one lens provided with at least one reference surface at a constant angle with respect to the optical axis on the outer peripheral portion, and the optical axes of the respective lenses coincide with each other.
- the reference planes of the lenses are matched to each other, and no lens barrel is required for optical axis alignment.
- a lens system having the same optical axis can be obtained, so that a lens barrel is not required for adjusting the optical axis. Therefore, the size of the device can be reduced.
- the reference plane is perpendicular to the optical axis. Therefore, when the relative position of the lens is adjusted by setting the optical axis in the vertical direction, the reference plane is horizontal, which is convenient.
- a lens system according to one embodiment of the present invention has at least one of two corresponding reference surfaces. On the other hand, a concave portion for applying an adhesive is provided.
- the adhesive is conveniently stored in the recess.
- a lip for fixing a lens is provided outside a reference surface of an outer peripheral portion of a lens.
- the lens can be fixed by welding the ribs.
- the rib is provided outside the reference surface, it is possible to prevent the reference surface from being deformed due to heat of welding.
- annular groove that forms a concentric circle with the optical axis of the lens as a center is provided on a reference surface of the lens.
- the lens system according to one embodiment of the present invention further includes a diaphragm having at least one reference plane at a certain angle with respect to the optical axis.
- the lens system according to one embodiment of the present invention further includes a structure provided on any one of the lenses or the diaphragm to adjust a distance between the lens system and the sensor.
- the lens system according to one embodiment of the present invention has a contact area of a reference surface such that the frictional force when the optical axes of the lenses are superimposed on each other without being connected in a vertical direction is equal for each contact surface. Has been established.
- a method of assembling a lens system including a plurality of lenses includes: aligning a plurality of lenses each having at least one reference surface at a constant angle with respect to an optical axis on an outer peripheral portion, each corresponding reference surface; And applying a force to the lenses so as to adjust the optical axes of the respective lenses so that they coincide with each other, and fixing the plurality of lenses whose optical axes coincide with each other.
- a lens system having the same optical axis can be obtained.
- a lens barrel is not required for optical axis adjustment, the size of the apparatus can be reduced.
- the lens is superimposed so that the optical axis of the lens is vertical, and in the adjusting step, a horizontal force is applied to the lens.
- a method of assembling a lens system having a plurality of lenses includes applying a force to the lenses via an XY stage in the adjusting step.
- the position of the lens can be adjusted reliably and easily.
- a method of assembling a lens system with a plurality of lenses includes applying a force to the lens with a centering actuator in the adjusting step.
- a method of assembling a lens system including a plurality of lenses includes taking an image of a plane perpendicular to an optical axis and adjusting the position of the lens based on the image.
- a method of assembling a lens system including a plurality of lenses comprising the steps of: providing a concentric annular groove around the optical axis of the lens on a reference plane of the lens; The center position of the lens is determined from the position of the annular groove, and adjustment is performed so that the optical axes of the lens system are aligned by aligning the center positions of the plurality of lenses.
- the optical axis of the lens system can be reliably and easily adjusted.
- a method of assembling a lens system including a plurality of lenses further includes, in the overlapping step, further overlapping and fixing a diaphragm having at least one reference plane at an angle with respect to an optical axis. In step, fix multiple lenses and apertures.
- the method of assembling a lens system comprising a plurality of lenses further comprises coupling any lens or aperture to a fixture. Therefore, it is convenient when fixing the lens system.
- FIG. 1 shows a configuration of a lens system according to an embodiment of the present invention.
- FIG. 2 shows a configuration of a lens system according to another embodiment of the present invention.
- FIG. 3 is a flowchart showing a method of assembling a lens system according to an embodiment of the present invention.
- FIG. 4 is a flowchart showing a method of aligning the optical axes of a plurality of lenses according to an embodiment of the present invention.
- FIG. 5 shows an optical axis alignment mechanism for a plurality of lenses according to an embodiment of the present invention.
- FIG. 6 shows an optical axis alignment mechanism for a plurality of lenses according to another embodiment of the present invention.
- FIG. 7 shows an example of the configuration of an XY axis stage.
- FIG. 8 shows an example of the configuration of the chuck.
- FIG. 9 shows the configuration of a conventional lens system. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 shows a configuration of a lens system according to an embodiment of the present invention.
- the lens system includes lenses 101 to 103 and an aperture 104.
- the peripheral edge of each lens includes a reference plane.
- the reference plane is preferably perpendicular to the optical axis. Sufficient accuracy should be ensured for the dimension in the lens thickness direction, that is, the optical axis direction.
- the specific dimensional accuracy is preferably from 2Z100 to 3Z100 mm or less.
- the lens system is configured to adjust the relative positions of the respective lenses along the reference plane by the method described below so that the optical axes of the respective lenses are aligned and then fixed. are doing.
- the lens is made of plastic, and is manufactured by injection molding using a mold. However, the material of the lens may be glass or the like, and may be manufactured by press molding or other manufacturing methods.
- an adhesive for fixing the lenses may be provided together with the reference surface of the peripheral part of the lens.
- an annular reference surface is provided on the periphery of the lens, and an annular concave portion is provided outside the reference surface.
- the shape and position of the reference plane are not limited to those of the present embodiment.
- a rib 201 for welding a lens may be provided outside the reference surface of the peripheral portion of the lens.
- the rib 201 is coated with an absorbent, and after adjusting the lens position, the lenses are fixed by welding by laser irradiation.
- the reason why the rib is provided outside the reference surface to perform welding is to prevent the reference surface from being deformed by heat.
- annular groove 202 for position adjustment may be provided on the reference surface of the lens. Since the annular groove 202 is a concentric circle centered on the axis, it can be easily obtained by coaxially adding a mold. A method of performing adjustment using the annular groove 202 will be described later.
- the optical axes of a plurality of lenses are aligned using a lens barrel. Then, a combination of multiple lenses and a lens barrel was screwed into an instrument called a hakama.
- the hakama is a receiving barrel that fixes sensors such as CCD and CMOS and determines the position of the lens system so that the lens system is in focus.
- the optical axes of the respective lenses are adjusted and then fixed by adjusting the relative positions of the respective lenses along the reference plane.
- the lens system including the lenses 1 to 3 and the aperture may be directly fixed to the hakama. Alternatively, it may be fixed to the lens barrel and then to the hakama.
- an example of the accuracy required for the optical axis alignment of a plurality of lenses is about 5Z1000 millimeters.
- the alignment accuracy required is about 5100 millimeters. Therefore, when a lens barrel is not used to align the optical axes of a plurality of lenses, restrictions on the manufacturing of the lens and the lens barrel are greatly reduced.
- step S310 in FIG. 3 the reference surfaces of the peripheral portions of the lenses are overlapped with each other. In this case, superimpose so that the optical axis direction is vertical. Preferably.
- step S3002 in FIG. 3 the deviation of the optical axis of each lens is adjusted.
- the method of adjusting the deviation of the optical axis will be described later in detail with reference to FIG.
- step S3030 in FIG. 3 a plurality of lenses having the same optical axis are fixed with, for example, an adhesive.
- an adhesive Use a UV curable resin adhesive or the like.
- an optical system having a plurality of lenses is fixed to a lens barrel or a hakama.
- an adhesive may be used, or a fixing member may be used.
- the adhesive a UV-curable resin-based adhesive or the like is used.
- the lens system is directly fixed to the hakama, there is no screwing, so a structure that can adjust the distance between the lens system and the sensor is required.
- a projection shape or a groove shape may be provided on the outer peripheral portion of the lens, and a groove shape or a projection shape may be provided on a corresponding portion of the hakama so that the two slide with each other.
- a plurality of protrusions are provided in the circumferential direction on a flat portion of the lens other than the lens surface, which is perpendicular to the optical axis, and the depth of the corresponding plurality of receiving portions of the hakama is determined by the number of steps in the circumferential direction. The distance may be changed so that the protrusions are received at different depths so that the distance between the lens system and the sensor can be adjusted.
- a receiving portion may be provided on a flat portion other than the lens surface, and a projection may be provided on the hakama.
- step S410 an image is observed through a plurality of lenses.
- the light from the light source 504 is collimated by the collimator 505, then passed through a plurality of lenses 501 and 502, and the screen 506 is placed on the focal plane. May be observed.
- step S 420 for example, in the case of an imaging lens system, it is observed whether the imaging state is good.
- the function of the lens system may be evaluated by measuring the wavefront by, for example, a well-known Shack-Hartmann measurement method. In any case, if the function of the lens system is good, the adjustment is completed because the optical axes of the multiple lenses match. If the function of the lens system is not good, proceed to step S430.
- step S4003 the moving direction and moving amount of any lens are determined.
- the moving direction and the moving amount are empirically determined from the imaging state and the measurement result by the Schatz-Hartmann measurement method.
- the centering actuator 503 described later moves the lens in the determined moving direction by the determined moving amount.
- the centering factor 503 is arranged around the lens 502 in the same plane parallel to the lens and facing the optical axis. For example, they may be arranged in four directions around the lens at 90 degree intervals.
- a plurality of sets of centering actuators may be provided, and a single set of centering actuators can be moved in the height direction. May be arranged so that it can be operated for each lens.
- reference numeral 507 denotes a fixture for fixing the lens.
- a centering actuator used for positioning in a direction perpendicular to the optical axis of a plurality of lenses superimposed in the vertical direction, that is, a horizontal direction, with the reference plane being the horizontal direction, will be described.
- the centering actuator is commercially available from Nano Control Co., Ltd. (6-17-17, Minamioi, Shinagawa-ku, Tokyo).
- Nano Control Co., Ltd. (6-17-17, Minamioi, Shinagawa-ku, Tokyo).
- an object fixed by friction can be moved by hitting in units of several tens of nanometers to several microns per step.
- the amount of movement per step can be adjusted by the voltage applied to the piezoelectric element.
- Friction occurs between the reference surfaces of a plurality of lenses superimposed in the vertical direction.
- the centering actuator acts to move the lenses in a direction perpendicular to the optical axes of the plurality of lenses, that is, in the horizontal direction.
- the step-by-step displacement of the centering actuator is a function of the voltage applied to the piezoelectric element and the corresponding frictional force between the reference planes. If the working condition of the reference surface is the same, the frictional force between the corresponding reference surfaces is proportional to the area of the contact surface or the force acting perpendicular to the contact surface. Therefore, when a plurality of lenses are superimposed as shown in FIG. 4, the frictional force becomes larger toward the lower reference surface due to the weight of the lenses. Therefore, when the voltage applied to the piezoelectric element is constant, the amount of movement of the centering actuator for each step changes. To keep the amount of movement for each step constant, it is necessary to keep the frictional force acting on the contact surface constant.
- the size of the contact surface may be determined so that the product of the total weight of the lens above the contact surface and the area of the contact surface is constant. By determining in this way, the frictional force acting on each contact surface becomes constant, The amount of movement for each step by the centering factor for each lens is also constant.
- an actuator such as a stepping motor, a servo motor, and a piezo (moving distance limited) can be used.
- FIG. 6 shows an example of a configuration in which a lens is moved via an XY axis stage.
- One of the lenses 601 has a fixed position in the X and Y directions.
- the other side of the lens is held by a chuck.
- the chuck 6 11 is fixed to the XY axis stage 6 12.
- the lens By moving the lens through the XY axis stage, the lens is not affected by the elastic deformation of the lens, and the movement amount control is reduced. Also, it does not scratch or damage the lens. In addition, the problem of difficult alignment of small lenses, such as those with a lens thickness of 1 mm or less, is eliminated.
- FIG. 7 shows an example of the configuration of the XY axis stage.
- the XY-axis stage combines a mechanism for moving in the X-axis direction and a mechanism for moving in the Y-axis direction.
- rails are provided and move in each direction by sliding.
- the direction perpendicular to the paper is the X-axis direction
- the direction parallel to the paper is the Y-axis direction.
- the portion 701 moves in the X-axis direction with respect to the portion 702 when a force in the X-axis direction is applied.
- the portion 702 moves in the Y-axis direction with respect to the portion 703 when a force in the Y-axis direction is applied.
- FIG. 8 shows an example of the configuration of the chuck.
- the chuck is composed of arms 800 and 803 and a flattening slide 800, and is fixed to the XY-axis stage 612 by a base 805.
- the arms 602 and 803 hold the lens 602.
- Arms 802 and 803 are attracted to each other by panels 821 and 822.
- FIG. 8 when the square root slide 81 moves downward, the arms 802 and 803 move the guides 811 to 814 against the tension of the panels 821 and 822. Open left and right along with the lens 8 4 1 is free.
- the position of the square root slide 801 is fixed by a stopper 804 that can move up and down.
- the position of the lens 602 with respect to the lens 601 is adjusted by moving the XY-axis stage 612 in the X-axis direction and the Y-axis direction by the actuator.
- the position adjustment can also be performed by taking an image on a plane perpendicular to the optical axis of the lenses 61 and 62 with the camera 621, and analyzing the image.
- an annular groove 202 is provided in the peripheral portion of the lenses 61 and 62.
- the annular groove 202 forms a concentric circle centered on the optical axis of the lens.
- the lens 602 is arranged on the lens 601, an image of the lens 602 is taken, and the center position, that is, the optical axis position is determined from the position of the annular groove 202 in the image.
- position adjustment is performed by an actuator so that the optical axis position of the lens 602 is aligned with the optical axis position of the lens 601.
- an XY axis stage 614 is further provided.
- the center of the lens 601 may be previously aligned with the center of the camera 621 using the XY axis stage 614.
- a Z-axis stage 6 13 is further provided.
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Abstract
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JP2005516250A JPWO2005057264A1 (ja) | 2003-12-12 | 2004-12-10 | レンズ系およびその組立方法 |
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JP2003415131 | 2003-12-12 | ||
JP2003-415131 | 2003-12-12 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012078357A (ja) * | 2010-09-30 | 2012-04-19 | Avago Technologies Fiber Ip (Singapore) Pte Ltd | 受動アライメントメンバを有した光学構成要素 |
US8482926B2 (en) | 2008-09-26 | 2013-07-09 | Sharp Kabushiki Kaisha | Optical element wafer module, optical element module, method for manufacturing optical element module, electronic element wafer module, method for manufacturing electronic element module, electronic element module and electronic information device |
US8547470B2 (en) | 2008-09-25 | 2013-10-01 | Sharp Kabushiki Kaisha | Optical element, optical element wafer, optical element wafer module, optical element module, method for manufacturing optical element module, electronic element wafer module, method for manufacturing electronic element module, electronic element module and electronic information device |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH035110U (ja) * | 1989-06-01 | 1991-01-18 | ||
JPH11344657A (ja) * | 1998-06-01 | 1999-12-14 | Sony Corp | レンズの組立体及びその組立方法 |
JP2002071909A (ja) * | 2000-09-04 | 2002-03-12 | Pioneer Electronic Corp | レンズ及びその製造方法 |
JP2002182090A (ja) * | 2000-12-18 | 2002-06-26 | Ricoh Co Ltd | リブ一体型レンズ、これを用いた光学ユニット、画像読取装置および画像形成装置 |
JP2002196211A (ja) * | 2000-12-26 | 2002-07-12 | Sony Corp | 複合レンズ、複合レンズの組立方法、固定絞りおよび固定絞りの成形方法 |
JP2003270477A (ja) * | 2002-03-13 | 2003-09-25 | Japan Science & Technology Corp | 位置合わせ装置および位置合わせ方法 |
-
2004
- 2004-12-10 JP JP2005516250A patent/JPWO2005057264A1/ja active Pending
- 2004-12-10 WO PCT/JP2004/018849 patent/WO2005057264A1/ja active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH035110U (ja) * | 1989-06-01 | 1991-01-18 | ||
JPH11344657A (ja) * | 1998-06-01 | 1999-12-14 | Sony Corp | レンズの組立体及びその組立方法 |
JP2002071909A (ja) * | 2000-09-04 | 2002-03-12 | Pioneer Electronic Corp | レンズ及びその製造方法 |
JP2002182090A (ja) * | 2000-12-18 | 2002-06-26 | Ricoh Co Ltd | リブ一体型レンズ、これを用いた光学ユニット、画像読取装置および画像形成装置 |
JP2002196211A (ja) * | 2000-12-26 | 2002-07-12 | Sony Corp | 複合レンズ、複合レンズの組立方法、固定絞りおよび固定絞りの成形方法 |
JP2003270477A (ja) * | 2002-03-13 | 2003-09-25 | Japan Science & Technology Corp | 位置合わせ装置および位置合わせ方法 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8547470B2 (en) | 2008-09-25 | 2013-10-01 | Sharp Kabushiki Kaisha | Optical element, optical element wafer, optical element wafer module, optical element module, method for manufacturing optical element module, electronic element wafer module, method for manufacturing electronic element module, electronic element module and electronic information device |
US8482926B2 (en) | 2008-09-26 | 2013-07-09 | Sharp Kabushiki Kaisha | Optical element wafer module, optical element module, method for manufacturing optical element module, electronic element wafer module, method for manufacturing electronic element module, electronic element module and electronic information device |
JP2012078357A (ja) * | 2010-09-30 | 2012-04-19 | Avago Technologies Fiber Ip (Singapore) Pte Ltd | 受動アライメントメンバを有した光学構成要素 |
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