WO2014147902A1 - Procédé et dispositif de détection d'inclinaison de lentille - Google Patents

Procédé et dispositif de détection d'inclinaison de lentille Download PDF

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Publication number
WO2014147902A1
WO2014147902A1 PCT/JP2013/083159 JP2013083159W WO2014147902A1 WO 2014147902 A1 WO2014147902 A1 WO 2014147902A1 JP 2013083159 W JP2013083159 W JP 2013083159W WO 2014147902 A1 WO2014147902 A1 WO 2014147902A1
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WIPO (PCT)
Prior art keywords
lens
image
tilt
light source
center position
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Ceased
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PCT/JP2013/083159
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English (en)
Japanese (ja)
Inventor
章博 矢内
三宅　隆浩
哲史 野呂
三木　錬三郎
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Sharp Corp
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Sharp Corp
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/02—Testing optical properties
    • G01M11/0221—Testing optical properties by determining the optical axis or position of lenses
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/22—Apparatus or processes for the manufacture of optical heads, e.g. assembly

Definitions

  • the present invention relates to a lens tilt detection device and a lens tilt detection method, and relates to a lens tilt detection device and a lens tilt detection method used for lens tilt adjustment of an optical communication lens, an imaging system lens, an optical disk lens, and the like.
  • the lens becomes an optical unit in which an actuator for driving the lens is mounted after being incorporated in the lens unit.
  • the lens is often tilted and adjusted with respect to the reference plane of the optical unit, and the lens is tilted with respect to the optical axis of the optical unit, and this optical unit is attached to the image sensor without adjustment.
  • a camera module having desired performance cannot be obtained. Therefore, it is necessary to measure the tilt of the lens in the state of the optical unit and adjust the generated tilt.
  • the tilt angle of the optical axis of the lens with respect to the holder into which the lens is assembled can be adjusted.
  • the lens tilt reference is set to the lens outer shape or the inner diameter of the holder in contact with the lens. There is a need. For this reason, in the state of the optical unit already incorporated in the holder in which these cannot be seen, there is a problem that the tilt of the lens cannot be measured accurately and the optical unit cannot be incorporated into the image sensor and adjusted.
  • an object of the present invention is to provide a lens tilt detection device and a lens tilt detection method capable of accurately detecting the tilt of the optical axis of a lens even in a state of an optical unit in which a lens is incorporated in a holder. Is.
  • a lens tilt detection device of the present invention is A plurality of point light sources arranged on the same plane perpendicular to the reference axis and spaced from each other, and irradiating light to the lens to be measured arranged on the reference axis; It is arranged so that the optical axis coincides with the reference axis on the side opposite to the lens to be measured with respect to the plurality of point light sources, and is generated by reflected light from a plurality of lens surfaces of the lens to be measured.
  • An imaging camera that captures a plurality of formed images of the point light source; An inclination angle of the optical axis of the lens to be measured with respect to the reference axis direction based on the relative shift amount of the center position of each of the plurality of formed images of the plurality of point light sources captured by the imaging camera; And a lens tilt detection unit for detecting the tilt direction.
  • the plurality of point light sources are arranged at the vertices of a plurality of polygons.
  • a light source controller that controls one or more point light sources among the plurality of point light sources so as to be lit at an arbitrary timing is provided.
  • a plurality of lenses of the measurement target lens are irradiated with light from a plurality of point light sources arranged on a plane orthogonal to the reference axis at intervals from each other, and irradiated to the measurement target lens arranged on the reference axis.
  • the light of the lens to be measured is based on the relative shift amounts of the respective center positions of the plurality of formed images of the plurality of point light sources captured by the imaging camera.
  • FIG. 1 is a diagram showing a schematic configuration of a lens tilt detection apparatus according to a first embodiment of the present invention.
  • FIG. 2A is a schematic view of a light source in which LEDs as an example of a point light source are arranged so as to be at the apex of a quadrangle in the lens tilt detection apparatus.
  • FIG. 2B is a schematic cross-sectional view of an optical unit in which the lens tilt is detected by the lens tilt detection device.
  • FIG. 3A is a diagram showing the relationship between the eccentricity generated when the lens of the optical unit is tilted and the image.
  • FIG. 3B is a diagram showing a virtual image due to light diverging and reflecting from the upper surface of the convex meniscus lens and a virtual image due to light diverging and reflecting from the upper surface of the lens and from the lower surface.
  • FIG. 3C is a diagram showing a real image by light converged and reflected by the upper surface of the concave meniscus lens and a real image by light that has passed through the upper surface of the lens and converged and reflected by the lower surface.
  • FIG. 3D is a diagram showing a real image by light converged and reflected on the upper surface of the biconcave lens, and a virtual image by light diverged and reflected by the lower surface through the upper surface of the lens.
  • FIG. 3E shows an image when the first lens is a biconvex lens and the second lens is a concave meniscus lens.
  • FIG. 4A is a diagram illustrating an image of a light source when the lens is not inclined.
  • FIG. 4B is a diagram illustrating a state of an image of the light source when the lens holder is rotated counterclockwise.
  • FIG. 4C is a diagram showing a state of an image of a light source when the lens holder is rotated clockwise.
  • FIG. 5A is a diagram illustrating a state of an image of a light source when the aperture of the lens holder is formed so as to be shifted from the center of the lens.
  • FIG. 5B is a diagram showing a state of an image of a light source when the lens holder is rotated counterclockwise.
  • FIG. 5C is a diagram showing a state of an image of a light source when the lens holder is rotated clockwise.
  • FIG. 6A is a diagram for explaining the measurement of the tilt amount of the light receiving surface of the image sensor.
  • FIG. 6B is a diagram for explaining the measurement of the tilt amount of the optical unit using the lens tilt detection apparatus.
  • FIG. 6C is a diagram for describing a product inspection in which an imaging chart is captured to confirm imaging characteristics.
  • FIG. 7A is a schematic diagram of a light source in which LEDs of a lens tilt detection apparatus according to a second embodiment of the present invention are arranged so as to be at the apexes of a quadrangular shape and a pentagonal shape.
  • FIG. 7B is a schematic diagram of the light source when only the point light source arranged at the apex of the quadrangular is turned on.
  • FIG. 7C is a schematic diagram of the light source when only the point light source arranged at the vertex of the pentagon is turned on.
  • FIG. 8A is a diagram showing an image of the light source when the lens is not inclined in the configuration of the light source in which the point light sources are arranged in a square shape shown in FIG. 7B.
  • FIG. 8A is a diagram showing an image of the light source when the lens is not inclined in the configuration of the light source in which the point light sources are arranged in a square shape shown in FIG. 7B.
  • FIG. 8B is a diagram showing a state of an image of the light source when the lens holder is rotated counterclockwise in the light source when only the point light source arranged at the vertex of the rectangle shown in FIG. 7B is turned on.
  • FIG. 8C is a diagram showing a state of an image of the light source when the lens holder is rotated counterclockwise in the light source when only the point light source arranged at the vertex of the pentagon shown in FIG. 7C is turned on.
  • FIG. 9A is a diagram showing a state of an image of the light source of the first example in which only a designated portion of each point light source is turned on.
  • FIG. 9B is a diagram showing a state of an image of the light source of the second example in which only a designated portion of each point light source is turned on.
  • FIG. 9C is a diagram showing a state of an image of the light source of the third example in which only a designated portion of each point light source is turned on.
  • FIG. 9D is a diagram illustrating a state of an image of the light source of the fourth example in which only a designated portion of each point light source is turned on.
  • FIG. 1 shows a schematic configuration of a lens tilt detection apparatus according to a first embodiment of the present invention.
  • the lens tilt detection apparatus 1 includes a light source 2, an imaging camera 3, a signal processing unit 4, an image processing unit 5, an arithmetic processing unit 6, and a display unit 7. And.
  • the signal processing unit 4, the image processing unit 5 and the arithmetic processing unit 6 constitute a lens tilt detection unit.
  • the light source 2 is a light source in which a plurality of LEDs (Light Emitting Diodes) 21 as an example of a point light source are arranged, and is orthogonal to the reference axis (the optical axis m of the imaging camera 3).
  • the four LEDs 21 are arranged on the same plane so as to be the apexes of the quadrangle.
  • the light emitting element used for this light source 2 is not restricted to LED, A fluorescent tube, an electric light bulb, a laser beam, EL (Electro-Luminescence: Electro luminescence) etc. may be sufficient.
  • the number and arrangement of the LEDs may be different.
  • the optical unit 10 drives a lens group 41 (three-lens configuration in FIG. 1), a lens holder 42 to which the lens group 41 is attached, and the lens holder 42 up and down.
  • the actuator 43 for this is comprised.
  • the light from the light source 2 is applied to the optical unit 10 as shown in FIG.
  • the light from the light source 2 forms an image reflected by the upper surface S1 and an image reflected by the lower surface S2 of the first lens L1 of the lens group 41.
  • the imaging camera 3 causes the lens unit 31 to make this image incident on a CCD (Charge Coupled Device) 32 that is a light receiving element.
  • the lens unit 31 is an imaging system that forms an image of the reflected light of the lens group 41 of the optical unit 10.
  • the light source 2 irradiates light to the optical unit 10 side, but does not irradiate light to the imaging camera 3 side.
  • an image of the light source 2 reflected by the upper surface S1 and the lower surface S2 of the first lens L1 is captured.
  • the shape of the image of the light source 2 is determined based on the positional relationship among the CCD 32, the lens unit 31, the light source 2, the first lens L 1, and the specification settings of the imaging camera 3.
  • the output signal from the CCD 32 is sent to the signal processing unit 4, and the signal processing unit 4 generates a video signal corresponding to the light intensity of the received image and transmits it to the image processing unit 5. Then, the image processing unit 5 converts the received video signal into an image signal.
  • the signal processing unit 4 may be provided in the CCD 32 or in the arithmetic processing unit 6.
  • the image signal converted by the image processing unit 5 is output to an arithmetic processing unit 6 composed of a microcomputer, and the arithmetic processing unit 6 obtains the center position of the image.
  • the arithmetic processing unit 6 includes a center position calculation unit 6a for determining the center position of the image of the reflected light from the first lens L1 captured by the imaging camera 3, and the image of the reflected light determined by the center position calculation unit 6a. And a lens tilt calculator 6b that calculates the tilt of the first lens L1 based on the center position.
  • center of the image light intensity or the like may be obtained from the positional relationship of the point light sources by the calculation of the image processing unit 5, or a specific position other than the center position or the center of gravity may be obtained.
  • a PSD Position Sensitive Device
  • a signal processing unit that processes an output signal of the PSD is used instead of the image processing unit 5.
  • the calculation processing unit 6 calculates the tilt (tilt angle and tilt direction) of the first lens L1 by performing a calculation process based on the output signal of the CCD 32.
  • the display unit 7 employs a liquid crystal display or a CRT display.
  • a lens group 41 (shown in FIG. 2B) composed of a plurality of first to third lenses L1, L2, and L3 is normally assembled with high-precision tilt adjustment.
  • the first lens L1 is often a lens that greatly affects the optical performance. Therefore, the inclination of the optical axis of the first lens L1 affects the optical performance of the lens group 41.
  • This lens tilt detection method obtains the state of eccentricity that occurs when the first lens L1 tilts, and detects the tilt (tilt angle and tilt direction) of the first lens L1.
  • the first lens L1 is a biconvex lens
  • the light emitted from the light source 2 is first divergently reflected by the upper surface S1 of the first lens L1, and the imaging camera is applied to the first lens L1.
  • a virtual image is formed at a point P1 on the opposite side to 3.
  • the light transmitted through the upper surface S1 of the first lens L1 and converged and reflected by the lower surface S2 forms a real image at a point P2 on the imaging camera 3 side with respect to the first lens L1.
  • an image is formed at a point P1 on the opposite side (back side) of the light source 2 with respect to the first lens L1, and the light source with respect to the first lens L1.
  • An image is formed at the point P2 on the second side (near side).
  • the depth of field of the imaging camera 3 is such that only the points P1 to P2 are observed simultaneously.
  • the depth of field is not sufficient from the point P1 to the point P2, there is no problem as long as an image capable of measuring the center of the image is obtained.
  • the first lens L1 is a convex meniscus lens as viewed from the illumination side
  • the light emitted from the light source 2 is first divergently reflected by the upper surface S1 of the first lens L1, and is reflected at the point P1.
  • the light transmitted through the upper surface S1 of the first lens L1 is divergently reflected by the lower surface S2 of the first lens L1, and forms a virtual image at the point P2.
  • images taken at these points P1 and P2 are observed by the imaging camera 3, images are formed at points P1 and P2 on the opposite side (back side) of the light source 2 with respect to the first lens L1.
  • the first lens L1 is a concave meniscus lens as viewed from the illumination side
  • the light emitted from the light source 2 is first converged and reflected by the upper surface S1 of the first lens L1, and is reflected at the point P1.
  • Real image is possible.
  • the light transmitted through the upper surface S1 of the first lens L1 is converged and reflected by the lower surface S2 of the first lens L1, and forms a real image at the point P2.
  • images formed at these points P1 and P2 are observed by the imaging camera 3, images are formed at points P1 and P2 on the light source 2 side (near side) with respect to the first lens L1.
  • the first lens L1 is a biconcave lens
  • the light emitted from the light source 2 is first converged and reflected by the upper surface S1 of the first lens L1, and a real image is formed at the point P1.
  • the light transmitted through the upper surface S1 of the first lens L1 is divergently reflected by the lower surface S2 of the first lens L1, and forms a virtual image at the point P2.
  • images formed at these points P1 and P2 are observed by the imaging camera 3
  • an image is formed at a point P1 on the light source 2 side (near side) with respect to the first lens L1, and opposite to the light source 2 with respect to the first lens L1.
  • An image is formed at the point P2 on the back side (back side). In this manner, a reflection elephant from the front and back surfaces of one lens is formed on the optical axis m regardless of the shape of the lens.
  • the first lens L1 is a convex lens
  • the light emitted from the light source 2 is first divergently reflected by the upper surface S1 of the first lens L1, and a virtual image is formed at the point P1.
  • the light transmitted through the upper surface S1 of the first lens L1 is converged and reflected by the lower surface S2 of the first lens L1, and forms a real image at the point P2.
  • the light transmitted through the first lens L1 converges and reflects on the upper surface S1 of the second lens L2, passes through the first lens L1, and forms a real image at the point P3.
  • the light transmitted through the second lens L2 is converged and reflected by the lower surface S4 of the second lens L2, passes through the first lens L1, and forms a real image at the point P4.
  • the depth of field W of the imaging camera 3 may be designed so that all images of P1 to P4 can be observed at one time, but it is desirable to design at least two images (W in FIG. 3E). Design example in which two points P1 and P2 can be observed at once).
  • the imaging camera 3 may focus on each image point sequentially and observe it sequentially.
  • FIG. 4A, FIG. 4B, and FIG. 4C show the state where these illumination images are lens tilted.
  • 4A, 4B, and 4C an image obtained by the CCD 32 (shown in FIG. 1) is shown in the upper part of the drawing, and the inclination state of the optical axes of the lens holder 42 and the first lens L1 is schematically shown in the lower part of the drawing. Shown in the figure.
  • FIG. 4A shows a case where the first lens L1 is not tilted.
  • the images R1 and R2 of the light source 2 (points P1 and P2 representing the center position) appear at the vertices of the square.
  • the optical surfaces (S1, S2) are decentered, and the decentered state is an image obtained by the imaging camera 3 (a point P1 representing the center position of the images R1, R2). , P2) can be detected from the relative positional relationship, and the tilt angle, tilt direction, and the like of the optical axis of the first lens L1 with respect to the optical axis m direction can be obtained by back calculation from the detected eccentric state.
  • the inclination direction of the optical axis of the first lens L1 with respect to the optical axis m direction can be detected.
  • the distance between the points P1 and P2 representing the center position of the image of the light source 2 the inclination angle of the optical axis of the first lens L1 with respect to the optical axis m direction can be detected.
  • the tilt correction of the first lens L1 can be performed by adjusting the images R1 and R2 of the light source 2 so as to be concentric and overlapping the points P1 and P2 representing the center position.
  • the inclination angle of the optical axis of the first lens L1 is detected by detecting the relative positional relationship between two or more images of the lens, and therefore the first mounted on the optical unit 10 where the lens outer shape cannot be seen. This is effective for the lens L1.
  • the images R1 and R2 are concentrically centered without being affected by the influence.
  • the points P1 and P2 representing the position overlap it can be determined that there is no lens tilt.
  • the optical surfaces (S1, S2) are decentered, and the decentered state can be detected from the relative positional relationship of the obtained image.
  • the angle of inclination of the optical axis of the first lens L1 with respect to the optical axis m direction can be obtained by calculating backward from the above state.
  • the inclination direction of the optical axis of the first lens L1 with respect to the optical axis m direction can be detected.
  • the distance between the points P1 and P2 representing the center positions of the images R1 and R2 of the light source 2 the inclination angle of the optical axis of the first lens L1 with respect to the optical axis m direction can be detected.
  • the description is given with the reflected image of only the first lens L1, but the same applies to the case where two or more images are obtained in the optical unit including two or more lenses.
  • the state where the images are concentric is a state where there is no lens tilt.
  • the tilt angle is detected by the sum of the differences between the center positions of the images, and the tilt direction is detected by detecting the direction in which each image is decentered when the tilt occurs. Can be recognized.
  • the assembly flow of the imaging camera module is executed by an instruction from a program in the arithmetic processing unit 6 (shown in FIG. 1).
  • This program is stored in a ROM (Read Only Memory) or RAM (Random Access Memory) (not shown) in the arithmetic processing unit 6.
  • an imaging sensor 9 for a camera module is set in an assembly device (not shown), and a reference axis (optical axis) is set by a tilt sensor 20 arranged on an assembly reference axis (optical axis m) of the assembly device.
  • the tilt amount (tilt angle) ⁇ 1 of the light receiving surface of the image sensor 9 with respect to m) is measured.
  • the optical unit 10 for the camera module is set in the assembling apparatus, and the lens inclination detecting apparatus 1 of the first embodiment arranged on the assembling reference axis (optical axis m) of the assembling apparatus,
  • the tilt amount (tilt angle) ⁇ 2 of the lens group 41 with respect to the reference axis (optical axis m) is measured.
  • the image sensor 9 is corrected from the tilt amount ⁇ 1 to the tilt amount ⁇ 2 of the lens group 41, the relative position is adjusted to the optical unit 10, and then the camera module is assembled.
  • the optical unit 10 is corrected from the tilt amount ⁇ 2 to the tilt amount ⁇ 1 of the image sensor and the relative position is adjusted to the image sensor 9, and then assembled to assemble the camera module.
  • the posture of the optical unit 10 is adjusted so that the tilt amount ⁇ 1 of the imaging sensor 9 is zero with respect to the reference axis (optical axis m) and the tilt amount ⁇ 2 of the lens group 41 is zero.
  • the camera module is assembled by assembling.
  • FIG. 6C the figure is assembled by the method of (1) above.
  • An imaging chart C arranged perpendicular to the axis m) is imaged to confirm imaging characteristics and perform product inspection.
  • the camera module can be assembled by correcting the tilt amount, and the camera module that becomes defective due to the lens tilt can be assembled. It is possible to reduce the manufacturing cost.
  • the lens tilt detection device and the lens tilt detection method of the first embodiment based on the relative shift amounts of the center positions of the plurality of formed images of the plurality of LEDs 21 captured by the imaging camera 3, By detecting the tilt angle and the tilt direction of the optical axis of the first lens L1 to be measured with respect to the reference axis m direction, even if the first lens L1 to be measured is tilted, the light of the first lens L1 to be measured The inclination of the axis can be detected accurately.
  • [Second Embodiment] 7A to 7C show the light source 2 in which the LEDs 21 of the lens tilt detection apparatus according to the second embodiment of the present invention are arranged so as to be at the apexes of the quadrangular and pentagonal shapes.
  • the lens tilt detection device of the second embodiment has the same configuration as the lens tilt detection device of the first embodiment except for the light source 102, and FIG.
  • the lens tilt detection apparatus of the second embodiment in the light source 102 in which the LEDs 21 are arranged to be the apexes of the quadrangular and pentagon, a plurality of LEDs 21 are arranged at the apexes of the quadrangular.
  • the LED group and the LED group in which a plurality of LEDs 21 are arranged at the apex of the pentagon can be turned on separately.
  • the on / off of the LED 21 of the light source 102 is controlled by the arithmetic processing unit 6 (shown in FIG. 1) including a light source control unit, but a control unit having a function of controlling the light source may be provided separately.
  • the light emitting element used for the light source 102 is not limited to the LED, and may be a fluorescent tube, a light bulb, a laser beam, an EL, or the like. Further, the number and arrangement of the respective LEDs may be different.
  • the image is formed by reflecting the light on the upper surface of the lens and the light is reflected on the lower surface.
  • the formed images are extremely close to each other or when the images partially overlap, the coordinates of the images may not be detected accurately.
  • FIG. 7C by changing to a configuration in which only the LED group in which the LEDs 21 are arranged at the vertices of the pentagon is turned on, overlapping can be prevented and accurate detection can be performed.
  • the LEDs 21 are arranged on the same plane orthogonal to the reference axis (optical axis m) so as to be the apexes of the quadrangular and pentagonal shapes.
  • the lens tilt detection apparatus of the second embodiment it is possible to prevent a decrease in detection accuracy due to approaching or overlapping of images by using a plurality of lighting shapes of point light sources.
  • FIG. 8A shows an illumination image when the first lens L1 is not tilted in the configuration of the light source 102 shown in FIG. 7B.
  • FIG. 8B shows the lens holder 42 in the configuration of the light source 102 shown in FIG. The state of the illumination image when rotated clockwise is shown.
  • the image obtained by the CCD 32 has images R1 and R2 of the light source 102 at square positions with respect to the lens holder 42. (Points P1 and P2 representing the center position) appear.
  • FIG. 8C shows an illumination image when the lens holder 42 is rotated counterclockwise in the lit light source 102 shown in FIG. 7C.
  • the optical surface is decentered, and the decentered state is relative to the images (points P1, P2 representing the center positions of the images R1, R2) obtained by the imaging camera 3. Since it can be detected from the positional relationship, it is possible to calculate the tilt angle, tilt direction, and the like of the optical axis of the first lens L1 with respect to the optical axis m direction by calculating backward from the detected eccentric state.
  • the inclination direction of the optical axis of the first lens L1 with respect to the optical axis m direction can be detected.
  • the tilt angle of the optical axis of the first lens L1 with respect to the optical axis m direction can be detected.
  • the tilt correction of the first lens L1 can be performed by adjusting the images R1 and R2 of the light source 102 so as to be concentric and overlapping the points P1 and P2 representing the respective center positions.
  • the lens tilt detection device of the second embodiment has the same effect as the lens tilt detection device of the first embodiment.
  • the plurality of LEDs 21 by arranging the plurality of LEDs 21 at the vertices of a plurality of polygons, two or more images necessary for detecting the lens tilt can be detected, and by using a plurality of LED groups as imaging targets. Even when some images of the light source cannot be detected accurately, the center position can be obtained (estimated) from the positional relationship of the other polygonal LED groups, and the detection accuracy of the lens tilt can be improved.
  • the lens inclination detection apparatus of this 2nd Embodiment has the structure same as the lens inclination detection apparatus of 1st Embodiment except the lighting control of the light source 2, and uses FIG.
  • the lens configuration of the optical unit 10 is a single lens configuration of the first lens L1.
  • the light source 2 is a light source in which LEDs are arranged as a point light source so as to have a quadrangular shape, and individual LEDs can be controlled to be lit separately.
  • the light emitting element used for this light source is not limited to the LED, but may be a fluorescent tube, a light bulb, a laser beam, an EL, or the like. Further, the number and arrangement of the respective LEDs may be different.
  • each LED is turned on individually or at a designated location, and the coordinates of the image are detected in each case.
  • the on / off of the LED of the light source 2 is controlled by the arithmetic processing unit 6 (shown in FIG. 1) including the light source control unit, but a control unit having a function of controlling the light source may be provided separately.
  • FIG. 9A one of the four LEDs of the light source 2 is turned on, and an image R1 formed by the upper surface S1 of the first lens L1 appears at the right apex of the small square (dotted line) in FIG. 9A.
  • An image R2 formed by the lower surface S2 of the first lens L1 appears at the left apex of the large rectangle (dotted line).
  • one of the four LEDs of the light source 2 (the LED on the opposite side of the LED lit in FIG. 9A) is turned on, and the second vertex of the small square (dotted line) in FIG.
  • An image R1 formed on the upper surface S1 of one lens L1 appears, and an image R2 formed on the lower surface S2 of the first lens L1 appears at the right apex of the large square (dotted line) in FIG. 9B.
  • FIG. 9C one of the four LEDs of the light source 2 (one of the other LEDs excluding the LED lit in FIGS. 9A and 9B) is lit, and the small square (dotted line) in FIG.
  • An image R1 formed by the upper surface S1 of the first lens L1 appears at the lower vertex
  • an image R2 formed by the lower surface S2 of the first lens L1 appears at the upper vertex of the large square (dotted line) in FIG. 9C.
  • FIG. 9D one of the four LEDs of the light source 2 (the LED on the opposite side of the LED lit in FIG. 9A) is lit, and the second top of the small square (dotted line) in FIG.
  • An image R1 formed on the upper surface S1 of one lens L1 appears, and an image R2 formed on the lower surface S2 of the first lens L1 appears at the lower vertex of the large square (dotted line) in FIG. 9D.
  • the images R1 and R2 formed by the upper surface S1 and the lower surface S2 of the first lens L1 are rotated by 180 ° and moved in the opposite direction to the lens tilt. Except for a large case, the coordinates can be detected without the two images R1 and R2 overlapping.
  • the lens tilt detection device of the third embodiment has the same effect as the lens tilt detection device of the first embodiment.
  • the lens inclination detection apparatus of the said 3rd Embodiment it is possible to prevent the fall of the detection accuracy by the approach of an image or an overlap by controlling lighting of several LED which comprises the light source 2 separately. Become.
  • the lighting control technology of the point light source of the lens tilt detection device of the third embodiment may be applied to the point light source of the lens tilt detection device of the second embodiment.
  • the lens tilt detection device of the present invention is A plurality of point light sources 21 arranged on the same plane perpendicular to the reference axis m and spaced from each other, and irradiating light to the lens to be measured arranged on the reference axis m; Reflected light from a plurality of lens surfaces of the measurement target lens L1, which is disposed on the side opposite to the measurement target lens L1 with respect to the plurality of point light sources 21 and so as to coincide with the reference axis m.
  • An imaging camera 3 that captures a plurality of formed images of the point light source 21 generated by The optical axis of the lens L1 to be measured with respect to the direction of the reference axis m based on the relative shift amounts of the center positions of the plurality of formed images of the plurality of point light sources 21 imaged by the imaging camera 3.
  • a lens inclination detecting section (4, 5, 6) for detecting the inclination angle and the inclination direction.
  • the lens L1 to be measured with respect to the reference axis m direction is based on the relative shift amounts of the center positions of the plurality of formed images of the plurality of point light sources 21 imaged by the imaging camera 3.
  • the tilt of the optical axis of the lens L1 to be measured can be accurately detected even if the lens L1 to be measured is tilted with respect to the direction of the reference axis m. it can.
  • the plurality of point light sources 21 are arranged at the vertices of a plurality of polygons.
  • the plurality of point light sources 21 by arranging the plurality of point light sources 21 at the vertices of a plurality of polygons, two or more images necessary for detecting the lens tilt can be detected, and a plurality of point light sources are to be imaged.
  • the center position can be obtained (estimated) from the positional relationship of other polygonal point light sources, and the lens tilt Detection accuracy can be improved.
  • a light source controller that controls one or more of the plurality of point light sources 21 so as to be lit at an arbitrary timing is provided.
  • two or more necessary for detecting the lens tilt by the light source control unit that controls one or two or more of the point light sources 21 so as to be lit at an arbitrary timing can be improved.
  • the lens tilt detection method of the present invention Light from a plurality of point light sources 21 arranged at intervals on a plane perpendicular to the reference axis is irradiated to the lens L1 to be measured arranged on the reference axis m, and the lens L1 to be measured is measured.
  • the reference axis m is based on the center position of the reflected light image on the first surface obtained by the center position calculation unit 6a and the center position of the reflected light image from another lens surface different from the first surface.
  • the tilt of the optical axis of the measurement target lens L1 can be accurately detected even if the measurement target lens L1 is tilted with respect to the reference axis m direction.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Lens Barrels (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
  • Optical Head (AREA)

Abstract

L'invention concerne un dispositif équipé : d'une pluralité de sources (21) de lumière ponctuelle qui sont disposées avec un espace entre elles sur un plan perpendiculaire à un axe de référence (m) et qui dirigent la lumière sur une lentille à mesurer, disposée sur l'axe de référence (m) ; une caméra (3) d'imagerie, disposée sur le côté opposé de la lentille à mesurer (L1) par rapport à la pluralité de sources (21) de lumière ponctuelle et de sorte que l'axe optique corresponde à l'axe de référence (m) et qui capture une pluralité d'images formées des sources (21) de lumière ponctuelle, générées par le biais de la lumière réfléchie depuis la pluralité de surfaces de lentille de la lentille à mesurer (L1) ; et des unités (4, 5, 6) de détection d'inclinaison de lentille, qui détectent l'angle et la direction d'inclinaison de l'axe optique de la lentille à mesurer (L1) par rapport à la direction de l'axe de référence (m), sur la base de la déviation relative de la position centrale de chacune des images formées parmi la pluralité d'images formées de la pluralité de sources (21) de lumière ponctuelle, capturées par la caméra (3) d'imagerie. En conséquence, l'invention concerne un dispositif et un procédé de détection d'inclinaison de lentille qui permettent de détecter précisément l'inclinaison de l'axe optique d'une lentille, même sous la forme d'une unité optique dans laquelle la lentille est intégrée dans un support.
PCT/JP2013/083159 2013-03-21 2013-12-11 Procédé et dispositif de détection d'inclinaison de lentille Ceased WO2014147902A1 (fr)

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JP2013-058670 2013-03-21
JP2013058670A JP2014182354A (ja) 2013-03-21 2013-03-21 レンズ傾き検出装置およびレンズ傾き検出方法

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GB2555643A (en) * 2016-11-08 2018-05-09 Nokia Technologies Oy Determining an intersection location of an optical axis of a lens with a camera sensor
CN112798232A (zh) * 2021-01-29 2021-05-14 深圳中科精工科技有限公司 一种摄像头部件光学性能的检测设备
CN113701997A (zh) * 2021-07-23 2021-11-26 歌尔光学科技有限公司 光学镜头偏心测试系统及方法
CN115127483A (zh) * 2022-07-05 2022-09-30 深圳市中图仪器股份有限公司 用于测量同轴度的检测方法、以及检测同轴度的系统
CN115883813A (zh) * 2022-11-17 2023-03-31 深圳市中达瑞和科技有限公司 多通道成像的光学偏心矫正方法
CN115933171A (zh) * 2022-11-29 2023-04-07 天津津航技术物理研究所 一种分析球面透镜定心磨边外圆去除量的建模方法
CN116045909A (zh) * 2022-12-28 2023-05-02 富联精密电子(郑州)有限公司 一种检测系统及倾角传感器
US20250067659A1 (en) * 2023-08-21 2025-02-27 Trioptics Gmbh Testing device for an optical sample and method for testing an optical sample

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TWI625557B (zh) * 2017-07-11 2018-06-01 大立光電股份有限公司 環形光學元件、成像鏡頭模組與電子裝置

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GB2555643A (en) * 2016-11-08 2018-05-09 Nokia Technologies Oy Determining an intersection location of an optical axis of a lens with a camera sensor
CN106709495A (zh) * 2017-01-22 2017-05-24 广东小天才科技有限公司 一种图像区域居中的方法和装置
CN112798232A (zh) * 2021-01-29 2021-05-14 深圳中科精工科技有限公司 一种摄像头部件光学性能的检测设备
CN113701997A (zh) * 2021-07-23 2021-11-26 歌尔光学科技有限公司 光学镜头偏心测试系统及方法
CN113701997B (zh) * 2021-07-23 2024-05-14 歌尔光学科技有限公司 光学镜头偏心测试系统及方法
CN115127483A (zh) * 2022-07-05 2022-09-30 深圳市中图仪器股份有限公司 用于测量同轴度的检测方法、以及检测同轴度的系统
CN115883813A (zh) * 2022-11-17 2023-03-31 深圳市中达瑞和科技有限公司 多通道成像的光学偏心矫正方法
CN115933171A (zh) * 2022-11-29 2023-04-07 天津津航技术物理研究所 一种分析球面透镜定心磨边外圆去除量的建模方法
CN116045909A (zh) * 2022-12-28 2023-05-02 富联精密电子(郑州)有限公司 一种检测系统及倾角传感器
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