WO2009107981A2 - 3차원형상 측정장치 및 측정방법 - Google Patents
3차원형상 측정장치 및 측정방법 Download PDFInfo
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- WO2009107981A2 WO2009107981A2 PCT/KR2009/000904 KR2009000904W WO2009107981A2 WO 2009107981 A2 WO2009107981 A2 WO 2009107981A2 KR 2009000904 W KR2009000904 W KR 2009000904W WO 2009107981 A2 WO2009107981 A2 WO 2009107981A2
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- image
- grid
- unit
- measurement object
- dimensional shape
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000005259 measurement Methods 0.000 claims abstract description 186
- 238000003384 imaging method Methods 0.000 claims description 113
- 238000007689 inspection Methods 0.000 claims description 80
- 238000005286 illumination Methods 0.000 claims description 63
- 238000012546 transfer Methods 0.000 claims description 42
- 239000000758 substrate Substances 0.000 claims description 18
- 238000000926 separation method Methods 0.000 claims description 15
- 230000001678 irradiating effect Effects 0.000 claims description 7
- 238000013507 mapping Methods 0.000 claims description 2
- 238000000691 measurement method Methods 0.000 claims 2
- 239000004973 liquid crystal related substance Substances 0.000 description 10
- 229910000679 solder Inorganic materials 0.000 description 7
- 230000000903 blocking effect Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/25—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
- G01B11/2513—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object with several lines being projected in more than one direction, e.g. grids, patterns
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/245—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures using a plurality of fixed, simultaneously operating transducers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/90—Arrangement of cameras or camera modules, e.g. multiple cameras in TV studios or sports stadiums
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/40—Optical focusing aids
Definitions
- the present invention relates to a three-dimensional shape measuring apparatus and a measuring method, and more particularly to a three-dimensional shape measuring apparatus and measuring method that can increase the measurement accuracy of the three-dimensional shape of the measurement object.
- the three-dimensional shape measuring apparatus is a device for measuring the three-dimensional shape of the measurement object by irradiating the grid pattern light on the measurement object, and receiving and analyzing the grid image reflected from the measurement object.
- the conventional three-dimensional shape measuring apparatus includes one projection unit for irradiating the grid pattern illumination on the measurement object and one imaging unit for taking a grid image reflected from the measurement object.
- the three-dimensional shape of the measurement target is measured by rotating the projection unit to the other side and then irradiating the grid-patterned lighting, but it takes a relatively long measurement time.
- the present invention has been made in view of such a problem, and provides a three-dimensional shape measuring apparatus and a measuring method capable of improving the productivity of the three-dimensional shape measuring operation of the measurement object and improving the measurement accuracy.
- a three-dimensional shape measuring apparatus includes a projection unit for generating and irradiating a grid-patterned light, an XY axis transfer table installed below the projection unit to transfer an inspection object, and between the projection unit and the XY axis transfer table.
- a beam separation unit installed at the beam separation unit for separating and passing the reflection image from the inspection object, and installed at a lower side of the beam separation unit in a circumferential direction to be spaced apart from each other to reflect the reflection of the grid pattern image from the inspection object.
- It is characterized by consisting of a reflection mirror, and a plurality of imaging units installed on one side of the beam separation unit and the plurality of reflection mirrors to shoot the grid pattern image passed through the beam separation unit and the grid pattern image reflected from the plurality of reflection mirrors. .
- the three-dimensional shape measuring method comprises the steps of transferring the inspection object to the measurement position by the XY axis transfer table, and when the inspection object is transferred to the measurement position, the grid element is pitched by the grid transfer mechanism. Transferring the lattice element, and when the lattice element is pitch-transmitted, turning on the illumination source of the image forming unit to irradiate the lattice light with the inspection object, and when the lattice light is irradiated with the inspection object, the lattice image reflected from the inspection object Is irradiated through a plurality of reflective mirrors and photographed in a plurality of imaging units, and when a grid pattern image is photographed in the plurality of imaging units, turning off the illumination source of the imaging unit; The controller checks whether the lattice element is the N + 1 th pitch transfer, and if the lattice element is the N + 1 th pitch transfer, the first circular lamp portion or the second circular lamp portion.
- Photographing the inspection object with a plurality of imaging parts after turning on the object checking whether the measurement of the inspection object is completed when the imaging object is photographed by the plurality of imaging parts; Comprising a step of calculating the three-dimensional shape of the inspection object by using the image of the inspection object photographing the inspection object and the plurality of image forming the grid pattern image after turning on the lamp unit or the second circular lamp unit.
- a three-dimensional shape measuring apparatus includes a measuring substrate, a work-stage, a plurality of projections, an image forming portion, and a controller.
- the work-stage holds the measurement substrate.
- the plurality of projections each include a light source, a grating portion for transmitting light emitted from the light source, and a projection lens portion for forming grating image light of the grating portion on a measurement object in the measurement substrate, respectively for the measurement object.
- the image forming unit receives the grid image light reflected by the measurement object.
- the controller selectively turns on / off at least two or more of the plurality of projection units according to the shape of the measurement object.
- the three-dimensional shape measuring apparatus measures the three-dimensional shape of the measurement object by using the grid image light received by the imaging unit by the two or more projection units selectively turned on.
- a three-dimensional shape measuring apparatus includes a work-stage, a plurality of projections, an actuator, an image forming unit and a control unit.
- the work-stage fixes the measurement substrate measuring substrate which supports the measurement object.
- Each of the plurality of projection parts includes a light source, a grating for transmitting light emitted from the light source, and a projection lens part for forming grating image light of the grating on a measurement object in the measurement substrate, respectively, in different directions with respect to the measurement object.
- the direction of the light irradiated from the light source and the normal of the measurement substrate has a certain angle.
- a three-dimensional shape measuring apparatus includes a stage, at least one lighting unit, a plurality of imaging units, and a controller.
- the stage supports the measurement object.
- the illumination unit includes a light source and a grid, and irradiates the grid-patterned light on the measurement object.
- the imaging units pick up the grid image reflected from the measurement object in different directions.
- the controller calculates a three-dimensional shape of the measurement object by using the grid images captured by the imaging units.
- the imaging units include a main imaging unit and a sub imaging unit. The main imaging unit is disposed perpendicular to the reference plane of the stage.
- the sub-imager is disposed to be inclined at a predetermined angle with respect to the reference plane of the stage, and is spaced apart from each other along the circumferential direction with respect to the main imager.
- the controller matches a coordinate system of the grid images captured by the main image pickup unit and the sub image pickup units, calculates each confidence index for the matched grid images, and then weights the calculated confidence index.
- the three-dimensional shape of the measurement object can be calculated.
- a three-dimensional shape measuring apparatus includes a stage, at least one lighting unit, a main imaging unit, at least one sub imaging unit, and a controller.
- the stage supports the measurement object.
- the illumination unit irradiates the grid-patterned light on the measurement object.
- the main imaging unit picks up a main image of the grid image from which the grid-patterned light is reflected from the measurement object.
- the sub-imager picks up a sub-image in which the grid-patterned light is reflected by the measurement object and specularly reflected from the measurement object and does not enter the main imaging unit.
- the controller calculates a three-dimensional shape of the measurement object by using the main image and the sub image captured by the main image pickup unit and the sub image pickup unit.
- the controller matches the coordinate system of the main image and the sub images captured by the main image capturing unit and the sub image capturing units, and calculates respective reliability indexes of the matched main image and the sub images. Then, the weighted value may be added to the calculated confidence index to calculate the three-dimensional shape of the measurement object.
- the measurement object is transferred to the measurement position through the transfer of the stage.
- the grid object is irradiated to the measurement object through at least one lighting unit.
- the lattice image reflected from the measurement object through the lattice pattern illumination is imaged in a different direction through a plurality of imaging units.
- the three-dimensional shape of the measurement object is calculated using the grid images captured by the imaging units.
- the capturing of the grid image may include capturing a main image of the grid image reflected from the measurement object through a main image pickup unit disposed perpendicular to the reference plane of the stage, and simultaneously capturing the main image.
- the main image is specularly reflected from the measurement object among the grid images reflected from the measurement object through a plurality of sub-imaging parts which are inclined at an angle with respect to the reference plane of the stage and are spaced apart from each other along the circumferential direction about the main imaging part. And capturing a sub-image that does not enter the imaging unit.
- the calculating of the three-dimensional shape of the measurement object may include matching the coordinate system of the main image and the sub-images captured by the main image capturing unit and the sub image capturing units, respectively, and then matching the matched main image and the sub image. After calculating the confidence index for each, adding a weight to the calculated confidence index, the weighted data may be mapped to calculate a three-dimensional shape.
- FIG. 1 is a configuration diagram showing the configuration of a three-dimensional shape measuring apparatus according to a first embodiment of the present invention.
- FIG. 2 is a plan view of the projection part shown in FIG. 1.
- FIG. 3 is a plan view of the second and third illumination sources shown in FIG. 1.
- FIG. 4 is a flowchart illustrating a three-dimensional shape measuring method according to Embodiment 1 of the present invention.
- FIG. 5 is a schematic side view of a three-dimensional shape measuring apparatus according to a second embodiment of the present invention.
- FIG. 6 is a schematic plan view according to an embodiment of the three-dimensional shape measuring apparatus shown in FIG.
- FIG. 7 is a schematic plan view according to another embodiment of the three-dimensional shape measuring apparatus shown in FIG.
- FIG. 8 and 9 are plan views illustrating the operation of the liquid crystal display panel constituting the grating portion shown in FIG. 6 or 7.
- FIG. 10 is a schematic plan view according to still another embodiment of the three-dimensional shape measuring apparatus shown in FIG.
- FIG. 11 is a schematic plan view of still another embodiment of the three-dimensional shape measuring apparatus shown in FIG. 5.
- FIG. 12 is a view schematically showing a three-dimensional shape measuring apparatus according to a third embodiment of the present invention.
- FIG. 13 is a plan view of the three-dimensional shape measuring apparatus shown in FIG.
- FIG. 14 is an enlarged view enlarging a measurement object to explain a process of measuring a three-dimensional shape of the measurement object shown in FIG. 12.
- FIG. 15 is a flowchart illustrating a three-dimensional shape measuring method according to Embodiment 3 of the present invention.
- FIG. 1 is a block diagram showing the configuration of a three-dimensional shape measuring apparatus according to a first embodiment of the present invention
- Figure 2 is a plan view of the projection shown in Figure 1
- Figure 3 is a second and third shown in Figure 1 Top view of an illumination source.
- each of the first circular lamp unit 60 and the second circular lamp unit 70 shown in FIG. 1 represents a side cross-sectional state
- Reference numeral 70 denotes a planar cross-sectional state, respectively.
- the three-dimensional shape measuring apparatus according to the present embodiment, the projection unit 10, the XY axis transfer table 20, the beam separation unit 30, a plurality of reflecting mirrors 40 and a plurality It consists of four imaging units 50, each component is described as follows.
- the projection unit 10 generates and irradiates a grid-patterned light
- the X-Y axis transfer table 20 is installed below the projection unit 10 to transfer the inspection object P.
- the beam splitter 30 is installed between the projection unit 10 and the X-Y axis transfer table 20 to separate and pass the grid image reflected from the inspection object P.
- the plurality of reflection mirrors 40 are installed on the lower side of the beam separation unit 30 so as to be spaced apart from each other in the circumferential direction, and reflect the grid image reflected from the inspection object P.
- the plurality of imaging units 50 are respectively installed at one side of the beam splitter 30 and the plurality of reflective mirrors 40 and are reflected by the grid image passed through the beam splitter 30 and the plurality of reflective mirrors 40. Take a grid image.
- the projection unit 10 the XY axis transfer table 20, the beam separation unit 30, the plurality of reflective mirrors 40 and the plurality of image forming units constituting the three-dimensional shape measuring apparatus according to the present embodiment
- the detailed configuration is as follows.
- the projection unit 10 is composed of an illumination source 11, a grating element 12, a grating transfer mechanism 13, a projection lens 14, and a projection lens filter 15.
- the illumination source 11 of the projection unit 10 generates and irradiates the illumination
- the grid element 12 is installed below the illumination source 11 to convert the illumination irradiated from the illumination source 11 into a grid pattern illumination.
- the inclination angle g of the grating element 12 for converting the illumination into the grid pattern illumination is installed at an angle of 45 degrees with respect to the Y-axis direction in the X-Y axis plane as shown in FIG. 2.
- the grating transfer mechanism 13 is applied to the PZT (piezoelectric) and installed in the grating element 12 to transfer the grating element 12, and the projection lens 14 is installed below the grating element 12 to illuminate the lattice pattern illumination.
- the projection lens filter 15 is disposed under the projection lens 14 to irradiate the grid-patterned light irradiated through the projection lens 14 by filtration.
- the XY axis transfer table 20 includes a motor 21 for driving the XY axis transfer table 20 in the X axis direction, and a motor 22 for driving the XY axis transfer table 20 in the Y axis direction. Then, the inspection object (P) is aligned or transferred to the measurement position.
- the beam splitter 30 is a grid image generated by the projection unit 10 or the illumination generated from the first circular lamp unit 60 or the second circular lamp unit 70 is irradiated to the inspection object (P).
- a beam splitter is applied to irradiate the reflected image to one of the plurality of imaging units 50 installed on one side of the beam splitter 30.
- the plurality of reflecting mirrors 40 are X-axis to irradiate the grid image reflected from the inspection object P to the remaining plurality of image forming portions 50 except for the image forming portion 50 installed in the beam splitter 30. It is installed to be inclined in the direction, it is installed so as to be spaced apart in the circumferential direction. That is, the plurality of reflective mirrors 40 are installed to be spaced apart at equal intervals from each other along the circle shown by dashed lines in FIG. 3.
- the plurality of imaging units 50 simultaneously capture a grid image reflected by the reflection mirror 40 and are composed of a camera filter 51, an imaging lens 52, and a camera 53, respectively.
- the camera filter 51 filters and irradiates the grating image reflected by the reflection mirror 40.
- As the camera filter 51 for filtering the grid image one of a frequency filter, a color filter, and a light intensity control filter is applied.
- the imaging lens 52 is installed at one side of the camera filter 51 to form a grating image transmitted from the camera filter, and the grating image irradiated and irradiated by the imaging lens 52 is photographed by the camera 53.
- the camera 53 is installed at one side of the imaging lens 52 and photographs a grid image irradiated from the imaging lens 52.
- the first circular lamp unit 60 and the second circular shape for capturing a two-dimensional image, that is, an illumination image, for extracting a specific shape of the inspection object P
- the lamp unit 70 is additionally configured, and a control unit 80 for controlling these components is further provided.
- the first circular lamp unit 60 and the second circular lamp unit 70 further configured to the three-dimensional shape measuring apparatus according to the present embodiment will be described below.
- the first circular lamp unit 60 is installed on the lower side of the beam separation unit 30 to generate and irradiate the illumination to the inspection object (P) so that the illumination image is reflected from the inspection object (P).
- the second circular lamp unit 70 is installed on the lower side of the plurality of reflective mirrors 40 to generate illumination to the inspection object (P) so that the illumination image is reflected from the inspection object (P) and irradiates the inspection object (P).
- the first circular lamp unit 60 and the second circular lamp unit 70 for illuminating the inspection object P are composed of circular ring members 61 and 71 and a plurality of light emitting elements 62 and 72, respectively. .
- the circular ring members 61 and 71 have through holes 61a and 71a to allow the grid-patterned illumination or the grid image to pass therethrough.
- the through hole 71a of the second circular lamp unit 70 allows the illumination irradiated from the first circular lamp unit 60 to be irradiated to the inspection object P or the grid image reflected from the inspection object P is
- the diameter is larger than the through hole 61a of the first circular lamp unit 60 so as to be irradiated with the plurality of reflective mirrors 40.
- the plurality of light emitting elements 62 and 72 are installed below the circular ring members 61 and 71 to generate illumination.
- the illumination image reflected from the inspection object P is divided with the beam separation unit 30.
- Two reflection mirrors 40 are irradiated.
- Illumination images irradiated with the beam splitter 30 and the plurality of reflection mirrors 40 are respectively photographed by the plurality of imaging units 50.
- the grid image or the illumination image photographed by the plurality of imaging units 50 is received by the controller 80.
- the controller 80 uses the same to determine the three-dimensional shape of the inspection object P.
- the control unit 80 for calculating the three-dimensional shape of the inspection object P includes the projection unit 10, the XY axis transfer table 20, the plurality of imaging units 50, the first circular lamp unit 60, and the second.
- the circular lamp unit 70 and the like generally control the three-dimensional shape measuring apparatus of the present embodiment.
- the inspection object P is transferred to the measurement position by the X-Y axis transfer table 20 (S10).
- the grid element 12 is pitched by the grid transfer mechanism 13 (S20).
- the illumination source 11 of the image forming unit 50 is turned on to irradiate the grid-patterned light with the inspection object P (S30).
- the grid image reflected by the inspection object P is irradiated through the plurality of reflection mirrors 40 and photographed by the plurality of imaging units 50 (S40).
- the plurality of imaging units 50 simultaneously captures the grid image.
- the illumination source 11 of the imaging unit 50 is turned off (S50).
- the controller 80 checks whether the grating element 12 is the N + 1 th pitch transfer (S60). As described above, the step S60 of checking whether the N + 1 th pitch transfer is performed returns to the step S20 of pitch feeding the grating element 12 when the grating element 12 is not the N + 1 th pitch transfer. That is, when calculating the three-dimensional shape of the inspection object P using the 4-bucket algorithm, it is transferred four times at the pitch interval of the grating element 12.
- the grating element 12 is the N + 1 th pitch feed, turn on the first circular lamp unit 60 or the second circular lamp unit 70, and then photograph the inspection object P with a plurality of imaging units 50. (S70). That is, the illumination image which is a two-dimensional image of the inspection object P is photographed.
- a method for photographing an illumination image will be described in more detail as follows.
- the first circular lamp unit 60 is turned on (S71).
- the inspection objects P are photographed by the plurality of imaging units 50 (S72).
- the first circular lamp unit 60 is turned off (S73).
- the second circular lamp unit 70 is turned on (S74).
- the inspection objects P are photographed by the plurality of imaging units 50 (S75).
- the second circular lamp unit 70 is turned off (S76).
- step S80 of checking whether the measurement of the inspection object P is completed if the measurement of the inspection object P is not completed, the process returns to the step of transferring the inspection object P to the measurement position.
- the control unit 80 turns on the first circular lamp unit 60 or the second circular lamp unit 70 and then photographs the inspection object P.
- the three-dimensional shape of the inspection object P is calculated using the image of the image and the grid image photographed by the plurality of image forming units 50 (S90).
- the three-dimensional shape measurement time of the inspection object can be reduced by calculating the three-dimensional shape of the inspection object by simultaneously photographing the inspection object using a plurality of imaging units.
- FIG. 5 is a schematic side view of a three-dimensional shape measuring apparatus according to a second embodiment of the present invention.
- the three-dimensional shape measuring apparatus 100 includes a work-stage 130, a plurality of projection units 110, an image forming unit 150, and a controller 140. Include.
- the work-stage 130 secures the measurement substrate 120.
- the measuring substrate 120 includes a measurement object (A).
- the work-stage 130 transfers and fixes the measurement substrate 120 in the x-axis or y-axis direction. After being controlled and controlled by the controller 140, the measuring substrate 120 is transported and fixed, whereby the first auxiliary light source 160 and the second auxiliary light source 170 irradiate light to the measurement target A and measure the light. The entire measurement area of the measurement substrate 120 is set using the recognition mark displayed on the substrate 120.
- the plurality of projections 110 are arranged to irradiate light at a predetermined angle with respect to the normal of the measurement substrate 120. In addition, the plurality of projections 110 are arranged symmetrically with respect to the normal.
- the plurality of projections 110 irradiates the grid-patterned light toward the measurement object A.
- each of the plurality of projections 110, the light source 111, the grid portion 112 that transmits the light emitted from the light source 111 and the grid pattern illumination of the grid portion 112 is the measurement object And a projection lens portion 113 to form an image in (A).
- the light transmitted through the grating portion 112 forms a lattice pattern illumination.
- the grating portion 112 includes a blocking portion (not shown) and a transmission portion (not shown).
- the blocking unit blocks the light irradiated from the light source 111, and the transmitting unit transmits the light.
- the grating portion 112 may be formed in various forms. The grating section 112 will be described later.
- the projection lens unit 113 may be formed of, for example, a plurality of lens combinations, and focuses on the grid-patterned light formed through the grid unit 112 to the measurement object A disposed on the measurement substrate 120. Image it.
- the imaging unit 150 receives a grid image reflected by the measurement object A.
- the imaging unit 150 includes, for example, a camera 151 and a light receiving lens unit 152.
- the grating image reflected by the measurement object A is captured by the camera 151 via the light receiving lens unit 152.
- the control unit 140 may include an operation control unit 141 and a shape detecting unit 142.
- the control unit 140 controls the work-stage 130, the projection unit 110, and the image forming unit 150, and the shape detecting unit 142 is a measurement object located on the measurement substrate 120.
- Figure out the form of A when there is data information in advance in which the shape of the measurement object A of the measurement substrate 120 is known, the data information may be used without grasping the shape of the measurement object A.
- the control unit 140 may turn on the projection unit 110 by selecting an even number, and in this case, the even number of projection units 110 turned on may be symmetrical with respect to the measurement object.
- the grid image is captured only on one side, since the measurement object A is a three-dimensional shape protruding, the other side of the measurement object A may not be irradiated with the grid image, and thus an accurate three-dimensional shape may not be measured. Therefore, by measuring again on the opposite side, a more accurate three-dimensional shape can be measured.
- control unit 140 may turn on the two projection units 110 when the measurement object A identified by the shape detecting unit 142 is a quadrilateral, and the shape detecting unit 142 may be turned on.
- the measurement target A identified in the above is an ellipsoid
- at least 50% of the plurality of projection units 110 may be turned on.
- the plurality of projections 110 are arranged in a position symmetrical with each other compared to capturing the opposite grid image by moving the projection in the conventional three-dimensional shape measuring apparatus,
- the time required for measurement can be shortened, increasing the efficiency of the inspection.
- FIG. 6 is a schematic plan view according to an embodiment of the three-dimensional shape measuring apparatus shown in FIG. 5
- FIG. 7 is a schematic plan view according to another embodiment of the three-dimensional shape measuring apparatus shown in FIG.
- the projection unit 110 is arranged in a regular polygonal shape.
- the projection unit 110 may be arranged in a square (FIG. 2), a regular hexagon (FIG. 3), or the like.
- the liquid crystal display panel 112a may be used for the grating portion 112 illustrated in FIG. 5.
- a power supply is supplied to a graphic card (not shown) for controlling the grid image and the liquid crystal display panel 112a to the liquid crystal display panel 112a. It may further include a power supply (not shown).
- a power supply not shown.
- FIG. 8 and 9 are plan views illustrating the operation of the liquid crystal display panel constituting the grating portion shown in FIG. 6 or 7.
- the blocking unit 401 and the transmitting unit 402 are displayed on the liquid crystal display panel 102.
- the blocking unit 401 blocks the light, and the transmission unit 402 transmits the light, thereby projecting the lattice light onto the measurement object A.
- the pitch P is transferred by the values obtained by dividing n equally, and the grid-patterned light is projected onto the measurement target A (in FIG. 9, for example, a four bucket, that is, the pitch P).
- the measurement target A in FIG. 9, for example, a four bucket, that is, the pitch P.
- FIG. 10 is a schematic plan view according to still another embodiment of the three-dimensional shape measuring apparatus shown in FIG. 5, and FIG. 11 is a schematic plan view according to another embodiment of the three-dimensional shape measuring apparatus shown in FIG. 5.
- the grating portion formed in the projection part employs the grating 112b instead of the liquid crystal display panel 112a, and drives the same. It is substantially the same as the three-dimensional shape measuring apparatus shown in FIGS. 6 and 7 except for further including an actuator 601. Therefore, the same or similar components bear the same reference numerals, and redundant descriptions are omitted.
- a three-dimensional shape measuring apparatus includes a three-dimensional shape measuring apparatus of FIG. 6 or 7 having a grating portion 112 using a liquid crystal display panel 112a.
- the grating 112b is employed.
- the grid 112b may be formed by, for example, printing a grid pattern on a glass plate to form a blocking portion and a transmission portion. Two gratings may be formed simultaneously on the glass plate to be used in adjacent projections.
- an actuator 601 for finely conveying the grating 112b is formed.
- the three-dimensional shape measuring apparatus includes a plurality of projections arranged at vertices of regular polygons, and the grating 112b formed on two neighboring projections is transferred by one actuator 601.
- PZT can be used as the actuator 601
- the driving direction of the actuator 601 is reversed when the adjacent projections among the plurality of projections are sequentially driven. More specifically, after moving the grid 112b in the direction of arrow a and projecting the grid-patterned lights onto the measurement object A, the grid 112b in the neighboring projection part is moved in the arrow b direction. And project the grid lights.
- the grid pattern illumination is irradiated to the measurement object A through the grid 112b, and the image forming unit receives a grid image reflected by the measurement object a predetermined number of times of the grid (for example, 4 times). Run Thereafter, the grid pattern illumination is irradiated to the measurement object A through grid 112b, and the image forming unit performs a process of receiving a grid image reflected by the measurement object a predetermined number of times (eg, four times). do.
- grids 3 and 4 execute the same.
- the control unit uses a total of 16 grid images to be received for the shadow area (the area in which the grid-patterned light on the opposite side cannot be reached when projecting the grid-patterned light to one side of the object to be measured).
- the exact three-dimensional shape of this compensated measurement object is calculated.
- the shadow areas # 1 and 3 are compensated using the grid image values of 1 and 3
- the shadow area values of the areas # 2 and 4 are compensated using the grid image values 2 and 4.
- the shadow area value compensation replaces the value corresponding to the facing area.
- the actuator 601 employed in the three-dimensional shape measuring apparatus according to the present embodiment simultaneously drives the gratings 112b formed on two adjacent projections. Therefore, the number of actuators 601 can be reduced to half the number of projection portions.
- the conveying direction of the actuator 601 may reduce the time required for driving because the direction of the grating 112b is reversed when the neighboring projection units are sequentially driven.
- FIG. 12 is a view schematically showing a three-dimensional shape measuring apparatus according to a third embodiment of the present invention
- Figure 13 is a plan view of the three-dimensional shape measuring apparatus shown in FIG.
- the three-dimensional shape measuring apparatus 300 includes a stage 320 supporting the measurement object 310, at least one lighting unit 330, and a plurality of imaging units ( 340 and the control unit 350.
- the stage 320 supports the measurement object 310 and moves the measurement object 310 to the measurement position while moving in the x-axis and y-axis under the control of the controller 350.
- the lighting unit 330 irradiates the grid-patterned light 410 to the measurement object 310 fixed to the stage 320.
- the lighting unit 330 is disposed to be inclined at a predetermined angle with respect to the reference plane of the stage 320.
- the three-dimensional shape measuring apparatus 300 may include a plurality of lighting units 330 to increase the measurement accuracy.
- the 3D shape measuring apparatus 300 may include four lighting units 330, as shown in FIG. 13. In this case, the lighting units 330 are disposed to be spaced apart from each other along the circumferential direction with respect to the main imaging unit 340a disposed perpendicular to the reference plane of the stage 320.
- the lighting units 330 may be symmetrically disposed with respect to the normal of the reference surface of the stage 320. Accordingly, the plurality of lighting units 330 irradiates the grid-patterned lights 410 in different directions with respect to the measurement object 310 at regular time intervals.
- the three-dimensional shape measuring apparatus 300 may include a variety of lighting units 330, such as two, three, or six.
- Each lighting unit 330 includes a light source 332 and a grating 334.
- each of the lighting unit 330 may further include a grating transfer device 336 and the projection lens unit 338.
- the light source 332 irradiates light toward the measurement object 310.
- the grid 334 converts the light irradiated from the light source 332 into the grid pattern illumination 410 according to the grid pattern.
- the grid 334 is transferred n times by 2 ⁇ / n through a grid feeder 336 such as a piezo actuator (PZT) to generate the phase shifted grid patterned light 410.
- N is a natural number of 2 or more.
- the projection lens unit 338 projects the grid-patterned light 410 generated by the grid 334 onto the measurement object 310.
- the projection lens unit 338 may be formed of, for example, a plurality of lens combinations, and focuses the grid-patterned light 410 formed through the grating 334 to project it onto the measurement object 310. Therefore, each lighting unit 330 irradiates the grid pattern illumination 410 to the measurement object 310 at every transfer while transferring the grid 334 n times.
- the grid pattern light 410 irradiated from the illumination unit 330 is reflected from the measurement object 310 in different directions
- a plurality of imaging units 340 is included.
- the three-dimensional shape measuring apparatus 300 includes a main imaging unit 340a disposed perpendicularly to the reference plane of the stage 320 at an upper portion of the stage 320, and at a predetermined angle with respect to the reference plane of the stage 320. It includes a plurality of sub-imager 340b disposed inclined.
- the 3D shape measuring apparatus 300 may include four sub-imaging units 340b.
- the sub imaging units 340b are disposed to be spaced apart from each other along the circumferential direction with respect to the main imaging unit 340a.
- the sub-imagers 340b may be symmetrically disposed with respect to the normal of the reference surface of the stage 320.
- the three-dimensional shape measuring apparatus 300 may include two, three, or six sub-image pickup units 340b.
- Each of the main image capturing unit 340a and the sub image capturing units 340b may include a camera 342 and an imaging lens unit 344 for capturing the grid image 420.
- the camera 342 may use a CCD or CMOS camera. Therefore, the grating image 420 reflected from the measurement object 310 is imaged by the imaging lens unit 344 and is captured by the camera 342.
- the lighting units 330 and the sub imaging units 340b may be disposed on the same concentric circle with respect to the main imaging unit 340a.
- the lighting units 330 may be disposed on concentric circles different from the sub-imagers 340b.
- the lighting units 330 may be installed at different heights from the sub-imaging units 340b or may be installed at the same height.
- the lighting units 330 may be disposed between the sub imaging units 340b, respectively.
- the lighting units 330 when the lighting units 330 are installed at different heights from the sub-imaging units 340b, the lighting units 330 may be installed at the same position as the sub-imaging units 340b.
- the controller 350 controls the operations of the components included in the 3D shape measuring apparatus 300 as a whole.
- the controller 350 controls the transfer of the stage 320 to place the measurement object 310 at the measurement position.
- the control unit 350 operates the plurality of lighting units 330 sequentially, and irradiates the grid pattern illumination 410 to the measurement object 310 at every transfer while transferring the grid 334 of each lighting unit 330 n times.
- the lighting unit 330 is controlled to be.
- the controller 350 controls the plurality of imaging units 340 to simultaneously photograph the grid image 420 reflected from the measurement object 310.
- the controller 350 calculates a three-dimensional shape of the measurement object 310 using the grid images 420 captured by the main imaging unit 340a and the sub imaging units 340b. For example, the controller 350 matches the coordinate systems of the grid images 420 captured by the main imaging unit 340a and the sub imaging units 340b.
- the control unit 350 uses a value measured n times through the n-bucket algorithm in each of the main image capturing unit 340a and the sub image capturing units 340b to obtain a confidence index for each of the grid images 420. Visibility is calculated using Equations 1 and 2 below, weights are respectively added to the calculated five confidence indices, and the weighted data is mapped to calculate final measurement values.
- I 1, I 2, I 3, I 4 represents the intensity (intensity) of a grid image measured four times over a four-bucket algorithm, at each image pick-up unit for a point, V is this The confidence index of the grating image measured by each image pickup unit calculated by using is shown.
- the controller 350 may measure the measurement object using only the grid images 420 measured by the one or two sub-imagers 340b disposed adjacent to the main imager 340a and the lighting unit 330 in operation.
- the three-dimensional shape of 310 may be calculated.
- FIG. 14 is an enlarged view enlarging a measurement object to explain a process of measuring a three-dimensional shape of the measurement object shown in FIG. 12.
- the measurement object 310 may include a circuit board 312 and an electronic device 316 coupled by solder 314 on the circuit board 312.
- the grid pattern light 410 When the grid pattern light 410 is irradiated from the lighting unit 330, the grid pattern light 410 is reflected from the measurement object 310 to generate the grid image 420.
- the solder 314 connecting the electronic device 316 to the circuit board 312 has specular characteristics, specular reflection is performed at the solder 314. Accordingly, the grid image 420 reflected from some regions of the solder 314 region is reflected upward and enters the main imaging unit 340a, but the grid image 420 reflected from the remaining partial regions has a predetermined angle. Reflected inclined so as not to enter the main imaging unit 340a. Instead, the grid image 420 reflected from the measurement object 310 to be inclined at a predetermined angle is photographed by the sub imaging unit 340b.
- the grid pattern light 410 is reflected in the upward direction, and the main image is captured by the main imaging unit 340a and reflected from the measurement object 310.
- At least one sub imager 340b of the grating image 420 may be photographed by at least one sub imager 340b. Therefore, by appropriately combining the main image picked up by the main imaging unit 340a and the sub image picked up by the sub imaging unit 340b, the three-dimensional shape of the entire measurement object 310 including the solder 314 region is precisely obtained. It can be measured.
- 15 is a flowchart illustrating a three-dimensional shape measuring method according to an embodiment of the present invention.
- the controller 350 transfers the stage 320 to move the measurement object 310 to the measurement position (S100).
- the grid-patterned light 410 is irradiated to the measurement object 310 through the at least one lighting unit 330 (S200).
- the plurality of lighting units 330 are sequentially operated to be inclined at a predetermined angle with respect to the reference plane of the stage 320 and spaced along the circumferential direction about the main imaging unit 340a to sequentially operate the grid pattern illumination. 410) sequentially.
- each of the lighting unit 330 irradiates the grid pattern illumination 410 to the measurement object 310 at every transfer while transferring the grid 334 n times.
- the grid image 420 reflected from the measurement object 310 is photographed in different directions through the plurality of imaging units 340 (S300).
- the main image is photographed through the main image capturing unit 340a disposed perpendicular to the reference plane of the stage 320 and directed toward the upper side of the grid image 420 reflected from the measurement object 310.
- the reflection is reflected by the measurement object 310 through the sub-imaging units 340b which are inclined at a predetermined angle with respect to the reference plane of the stage 320 and are spaced apart from each other in the circumferential direction about the main imaging unit 340a.
- the sub image is specularly reflected by the measurement object 310 and reflected at an inclined angle at a predetermined angle without entering the main imaging unit 340a.
- the controller 350 matches coordinate systems of the main image and the sub-images captured by the main image capturing unit 340a and the sub image capturing units 340b, respectively (S400). That is, since the path difference occurs when the grid image 420 reflected from the measurement object 310 reaches the main imaging unit 340a and the sub imaging units 340b, the main imaging unit 340a is caused by such a path difference. ) And the grid images 420 captured by the sub-image capturing units 340b are generated. Therefore, by compensating for the deviation between the grid images 420 due to this path difference, the coordinate system of the main image and the sub-images are matched.
- the controller 350 calculates a three-dimensional shape of the measurement object 310 by mapping the main image and the sub-images based on a confidence index for each of the matched main image and the sub-images (see FIG. S500). For example, the controller 350 calculates a confidence index for each of the main image and the sub-images using Equations 1 and 2, and weights each of the calculated 5 confidence indices. ), And then the three-dimensional shape of the measurement area of the measurement object 310 is calculated using the weighted data. For example, the reliability of the final measured value may be improved by adding a high weight to an image exceeding a certain value among the calculated five confidence indices and adding or subtracting a low weight to an image below a certain value.
- the process of capturing the grid image 420 through the main image capturing unit 340a and the sub image capturing units 340b is repeated whenever the lighting unit 330 irradiates the grid pattern lighting 410.
- the controller 350 finally measures the three-dimensional shape of the measurement object 310 by using the images obtained through the photographing.
- the reflection is reflected by the measurement object 310 and is performed by the main imaging unit 340a.
- the sub-imagers 340b for capturing the sub-image that cannot be captured the three-dimensional shape of the measurement object 310 can be measured more precisely.
- the three-dimensional shape measuring apparatus and measuring method of the present invention can be applied to the field for measuring the three-dimensional shape of the measurement target, such as a printed circuit board or solder (solder).
- the measurement target such as a printed circuit board or solder (solder).
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Abstract
Description
Claims (15)
- 격자무늬조명을 발생하여 조사하는 투영부와,상기 투영부의 하측에 설치되어 검사대상물을 이송시키는 X-Y축 이송테이블과,상기 투영부와 상기 X-Y축 이송테이블 사이에 설치되어 검사대상물에서 반사되는 격자 이미지를 분리하여 통과시키는 빔 분리부와,상기 빔 분리부의 하측에 서로 원주방향으로 이격되도록 설치되어 검사대상물에서 반사되는 격자 이미지가 조사되면 이를 반사시키는 다수개의 반사거울과,상기 빔 분리부와 상기 다수개의 반사거울의 일측에 각각 설치되어 빔 분리부에서 통과되는 격자 이미지와 다수개의 반사거울에서 반사되는 격자 이미지를 촬영하는 다수개의 결상부로 구성됨을 특징으로 하는 3차원형상 측정장치.
- 격자무늬조명을 발생하여 조사하는 투영부와,상기 투영부의 하측에 설치되어 검사대상물을 이송시키는 X-Y축 이송테이블과,상기 투영부와 상기 X-Y축 이송테이블 사이에 설치되어 격자 이미지나 조명 이미지를 분리하여 통과시키는 빔 분리부와,상기 빔 분리부의 하측에 설치되어 검사대상물에서 조명 이미지가 반사되도록 검사대상물로 조명을 발생하여 조사하는 제1 원형램프부와,상기 빔 분리부의 하측에 서로 원주방향으로 이격되도록 설치되어 검사대상물에서 반사되는 격자 이미지나 조명 이미지가 조사되면 이를 반사시키는 다수개의 반사거울과,상기 다수개의 반사거울의 하측에 설치되어 검사대상물에서 조명 이미지가 반사되도록 검사대상물로 조명을 발생하여 검사대상물로 조사하는 제2 원형램프부와,상기 빔 분리부와 상기 다수개의 반사거울의 일측에 각각 설치되어 빔 분리부와 다수개의 반사거울에서 조사되는 격자 이미지나 조명 이미지를 촬영하는 다수개의 결상부와,상기 다수개의 결상부에서 촬영된 격자 이미지나 조명 이미지를 수신받아 검사대상물의 3차원형상을 산출하는 제어부로 구성됨을 특징으로 하는 3차원형상 측정장치.
- X-Y축 이송테이블에 의해 검사대상물을 측정위치로 이송시키는 단계와,검사대상물이 측정위치로 이송되면 격자이송기구에 의해 격자소자를 피치 이송시키는 단계와,격자소자가 피치 이송되면 결상부의 조명원을 온시켜 격자무늬조명을 검사대상물로 조사하는 단계와,검사대상물로 격자무늬조명이 조사되면 검사대상물에서 반사되는 격자 이미지를 다수개의 반사거울을 통해 조사받아 다수개의 결상부에서 촬영하는 단계와,다수개의 결상부에서 격자 이미지가 촬영되면 결상부의 조명원을 오프시키는 단계와,결상부의 조명원이 오프되면 제어부는 격자소자가 N+1 번째 피치이송인지 여부를 확인하는 단계와,격자소자가 N+1 번째 피치 이송이면 제1 원형램프부나 제2 원형램프부를 온시킨 후 검사대상물을 다수개의 결상부로 촬영하는 단계와,검사대상물을 다수개의 결상부가 촬영하면 검사대상물의 측정이 완료되었는지 여부를 확인하는 단계와,검사대상물의 측정이 완료되면 제어부는 제1 원형램프부나 제2 원형램프부를 온시킨 후 검사대상물을 촬영한 검사대상물의 이미지와 다수개의 결상부에서 촬영된 격자 이미지를 이용하여 검사대상물의 3차원형상을 산출하는 단계로 구성됨을 특징으로 하는 3차원형상 측정방법.
- 베이스 부재를 고정하는 워크-스테이지(work-stage);각각이 광원, 상기 광원에서 조사된 빛을 투과시키는 격자 및 상기 격자의 격자무늬조명을 상기 베이스 부재 내의 측정대상물에 결상시키는 투영렌즈부를 포함하며, 상기 측정대상물에 대해 각각 다른 방향에서 격자무늬조명을 조사하는 다수의 투영부;상기 측정대상물에 의해 반사되는 격자 이미지를 수신하는 결상부; 및상기 측정대상물의 형태에 따라 상기 다수개의 투영부 중 적어도 2개 이상을 선택적으로 턴온(turn on)/턴오프(turn off)하는 제어부를 포함하여, 상기 선택적으로 턴온된 2개 이상의 투영부에 의해 상기 결상부에 수신된 격자 이미지를 이용하여 상기 측정대상물의 3차원형상을 측정하는 3차원형상 측정장치.
- 제4항에 있어서,상기 제어부는 상기 결상부에 의해 수신된 상기 격자 이미지를 이용하여 상기 측정대상물의 그림자 영역을 보상하기 위하여 상기 그림자 영역에 해당되는 측정값은 마주보는 값으로 대체하는 것을 특징으로 하는 3차원형상 측정장치.
- 제4항에 있어서,상기 제어부는 상기 측정 대상물이 타원형상인 경우, 상기 다수개의 투영부중 50% 이상을 턴온시키는 것을 특징으로 하는 3차원형상 측정장치.
- 측정기판를 고정하는 워크-스테이지;각각이 광원, 상기 광원에서 조사된 빛을 투과시키는 격자 및 상기 격자의 격자무늬조명을 상기 베이스 부재 내의 측정대상물에 결상시키는 투영렌즈부를 포함하며, 상기 측정대상물에 대해 각각 다른 방향에서 격자무늬조명을 조사하기 위해서 정다각형 형태로 배열되고, 상기 광원에서 조사된 빛이 진행하는 방향과 상기 베이스 부재의 법선이 일정 각도를 갖는 다수의 투영부;상기 다수의 투영부 중, 이웃하는 두 개의 투영부의 상기 격자의 이동을 제어하는 격자 엑추에이터;상기 측정대상물에 의해 반사되는 상기 격자이미지 광을 수신하는 결상부; 및상기 측정대상물의 형태에 따라 상기 다수개의 투영부 중 적어도 2개 이상을 선택적으로 턴온/턴오프하는 제어부를 포함하여, 상기 선택적으로 턴온된 2개 이상의 투영부에 의해 상기 결상부에 수신된 격자 이미지를 이용하여 상기 측정대상물의 3차원형상을 측정하는 3차원형상 측정장치.
- 제7항에 있어서,상기 엑추에이터는 이웃하는 두 개의 투영부의 격자를 동시에 움직이는 것을 특징으로하는 3차원 형상 측정장치.
- 측정대상물을 지지하는 스테이지;광원 및 격자를 포함하며, 상기 측정대상물에 격자무늬조명을 조사하는 적어도 하나의 조명부;상기 측정대상물에서 반사되어 나오는 격자 이미지를 서로 다른 방향에서 촬상하는 복수의 촬상부들; 및상기 촬상부들에서 촬상된 상기 격자 이미지들을 이용하여 상기 측정대상물의 3차원 형상을 산출하는 제어부를 포함하는 3차원 형상 측정장치.
- 제9항에 있어서, 상기 촬상부들은상기 스테이지의 기준면에 대해 수직으로 배치된 메인 촬상부; 및상기 스테이지의 기준면에 대해 일정 각도로 기울어지게 배치되며, 상기 메인 촬상부를 중심으로 원주 방향을 따라 서로 이격되도록 배치된 다수의 서브 촬상부들을 포함하는 것을 특징으로 하는 3차원 형상 측정장치.
- 제10항에 있어서,상기 제어부는 상기 메인 촬상부 및 상기 서브 촬상부들에서 촬상된 상기 격자 이미지들의 좌표계를 매칭시키고, 매칭된 상기 격자 이지미들에 대한 각각의 신뢰지수(visibility)를 산출한 후 산출된 신뢰지수에 가중치를 부가하여 상기 측정대상물의 3차원 형상을 산출하는 것을 특징으로 하는 3차원 형상 측정장치.
- 측정대상물을 지지하는 스테이지;상기 측정대상물에 격자무늬조명을 조사하는 적어도 하나의 조명부;상기 격자무늬조명이 상기 측정대상물에서 반사되어 나오는 격자 이미지 중 메인 이미지를 촬상하는 메인 촬상부;상기 격자무늬조명이 상기 측정대상물에서 반사되어 나오는 상기 격자 이미지 중 상기 측정대상물에서 정반사되어 상기 메인 촬상부로 들어가지 않는 서브 이미지를 촬상하는 적어도 하나의 서브 촬상부; 및상기 메인 촬상부 및 상기 서브 촬상부에서 촬상된 상기 메인 이미지 및 상기 서브 이미지를 이용하여 상기 측정대상물의 3차원 형상을 산출하는 제어부를 포함하는 3차원 형상 측정장치.
- 스테이지의 이송을 통해 측정대상물을 측정위치로 이송시키는 단계;적어도 하나의 조명부를 통해 상기 측정대상물에 격자무늬조명을 조사하는 단계;상기 측정대상물에서 반사되어 나오는 격자 이미지를 복수의 촬상부들을 통해 서로 다른 방향에서 촬상하는 단계; 및상기 촬상부들에서 촬상된 상기 격자 이미지들을 이용하여 상기 측정대상물의 3차원 형상을 산출하는 단계를 포함하는 3차원 형상 측정방법.
- 제13항에 있어서, 상기 격자 이미지를 촬상하는 단계는,상기 스테이지의 기준면에 대해 수직으로 배치된 메인 촬상부를 통해, 상기 측정대상물에서 반사되어 나오는 상기 격자 이미지 중 메인 이미지를 촬상하는 단계; 및상기 메인 이미지의 촬상과 동시에, 상기 스테이지의 기준면에 대해 일정 각도로 기울어지고 상기 메인 촬상부를 중심으로 원주 방향을 따라 서로 이격되도록 배치된 다수의 서브 촬상부를 통해, 상기 측정대상물에서 반사되어 나오는 상기 격자 이미지 중 상기 측정대상물에서 정반사되어 상기 메인 촬상부로 들어가지 않는 서브 이미지를 촬상하는 단계를 포함하는 것을 특징으로 하는 3차원 형상 측정방법.
- 제14항에 있어서, 상기 측정대상물의 3차원 형상을 산출하는 단계는,상기 메인 촬상부 및 상기 서브 촬상부들에서 각각 촬상된 상기 메인 이미지 및 상기 서브 이미지들의 좌표계를 매칭시키는 단계; 및매칭된 상기 메인 이미지 및 상기 서브 이미지들 각각에 대한 신뢰지수(visibility)를 산출하고, 산출된 신뢰지수에 가중치를 부가한 후, 가중치가 부가된 데이터를 매핑하는 단계를 포함하는 것을 특징으로 하는 3차원 형상 측정방법.
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WO2020263056A1 (ko) * | 2019-06-28 | 2020-12-30 | 주식회사 고영테크놀러지 | 대상체의 3차원 형상을 결정하기 위한 장치 및 방법 |
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US10996050B2 (en) | 2021-05-04 |
US20110050893A1 (en) | 2011-03-03 |
US10563978B2 (en) | 2020-02-18 |
CN103134446B (zh) | 2017-03-01 |
US9488472B2 (en) | 2016-11-08 |
US20170038197A1 (en) | 2017-02-09 |
US8854610B2 (en) | 2014-10-07 |
US20190293413A1 (en) | 2019-09-26 |
CN101960253A (zh) | 2011-01-26 |
US20200141721A1 (en) | 2020-05-07 |
WO2009107981A3 (ko) | 2009-11-05 |
US20140354804A1 (en) | 2014-12-04 |
US9243900B2 (en) | 2016-01-26 |
CN101960253B (zh) | 2013-05-01 |
US20210207954A1 (en) | 2021-07-08 |
US10359276B2 (en) | 2019-07-23 |
US20140354805A1 (en) | 2014-12-04 |
CN103134446A (zh) | 2013-06-05 |
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