WO2015122295A1 - タイヤ内面撮像方法及びその装置 - Google Patents
タイヤ内面撮像方法及びその装置 Download PDFInfo
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- WO2015122295A1 WO2015122295A1 PCT/JP2015/052692 JP2015052692W WO2015122295A1 WO 2015122295 A1 WO2015122295 A1 WO 2015122295A1 JP 2015052692 W JP2015052692 W JP 2015052692W WO 2015122295 A1 WO2015122295 A1 WO 2015122295A1
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- Prior art keywords
- mirror
- tire
- camera
- imaging
- tread
- Prior art date
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- 238000003384 imaging method Methods 0.000 title claims abstract description 135
- 230000003287 optical effect Effects 0.000 claims description 72
- 238000004441 surface measurement Methods 0.000 claims description 40
- 230000007246 mechanism Effects 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 10
- 230000001678 irradiating effect Effects 0.000 claims description 6
- 238000007689 inspection Methods 0.000 description 11
- 238000005259 measurement Methods 0.000 description 5
- 239000011324 bead Substances 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000005286 illumination Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
- G01M17/02—Tyres
- G01M17/027—Tyres using light, e.g. infrared, ultraviolet or holographic techniques
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/954—Inspecting the inner surface of hollow bodies, e.g. bores
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/105—Scanning systems with one or more pivoting mirrors or galvano-mirrors
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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
- H04N23/56—Cameras or camera modules comprising electronic image sensors; Control thereof provided with illuminating means
Definitions
- the present invention relates to a method and an apparatus for imaging the entire inner surface of a tire.
- Patent Document 1 inspects the position and depth of peeling of the tire inner surface by a double exposure hologram interference method using a laser. The separation of the tire is detected efficiently and clearly, contributing to the quality management of the tire, and the tread regeneration processing can be performed accurately.
- a tire inspection apparatus disclosed in Japanese Patent Application Laid-Open No. 2012-112838 (Patent Document 2) includes an inspection unit having illumination, a camera, a reflecting mirror curved along the inner peripheral surface of the tire, and a tire. And a driving unit that relatively rotates the inspection unit around the axis of the tire.
- the imaging unit captures light from the inner peripheral surface of the tire reflected by the mirror while relatively rotating the tire and the inspection unit, the upper half part of the tire in the tire width direction is composed of two imaging units. And the lower half can be photographed simultaneously.
- the tire test apparatus disclosed in Japanese Patent Laid-Open No. 2008-203258 has a measurement unit having at least three measurement heads, and each measurement head has an illumination member and a shearing member.
- the first and second measurement heads scan the outer surface of the tire sidewall.
- the third measuring head scans at least the inner surface of the tread portion.
- An object appearance / shape inspection apparatus disclosed in Japanese Patent Laying-Open No. 2003-240521 includes a light projecting unit that irradiates white slit light and a color CCD camera that images a slit light irradiation unit. Shoot while rotating the tire mounted on the turntable. Further, the coordinates and brightness of the tire are detected from the obtained image data by the coordinate computing means and the brightness computing means. Three-dimensional coordinate data and a color image of the tire are reconstructed from the obtained tire shape data and luminance data.
- a first imaging unit images a line portion irradiated with a first slit light on a tire as a subject. Then, the appearance data is obtained, and at the same time, the second imaging means images the same line portion obliquely by a predetermined angle by the second slit light irradiated to the line portion, and obtains the shape data. Furthermore, the quality of the appearance is determined from the appearance data, and the quality of the shape is determined from the shape data.
- An article inspection method disclosed in Japanese Patent Application Laid-Open No. 2009-115512 discloses a rotating table that holds a tire, an irradiation unit that irradiates the inner surface of the tire with a line-shaped laser beam, and a robot hand that photographs the inner surface of the tire. And whether the appearance is good or bad is determined based on the image data photographed using the camera.
- the problem with the mechanism that measures the inside of the tire is that the space inside the tire that becomes the tire hollow area filled with air when the tire is mounted on the rim is narrow, and the dimensions of the measurement part change depending on the size of the tire Is mentioned. For this reason, in order to image the entire inner surface of the tire using the conventional device or method described above, the size of the imaging unit that can be inserted into the space inside the tire is limited, and the tire inner surface is greatly curved in the tire width direction. Therefore, in order to image the entire tire inner surface, it is necessary to separately image the inner surfaces of both the tire sides and the tread inner surface.
- one side inner surface of the tire, the other side inner surface, and the tread inner surface must be imaged separately, or both tire inner surfaces and the tread inner surface must be imaged separately. Therefore, the man-hour for imaging increases, and it takes time to image one tire inner surface.
- an object of the present invention is to provide a tire inner surface imaging method and apparatus capable of imaging a tire inner surface in a short time even for tires having various tire outer diameters.
- One aspect of the present invention is a tire inner surface imaging method for imaging a tire inner surface.
- the method is With a light source, a mirror, and a camera, the mirror being inserted into the opening of a tire with a part of an imaging device configured to pivot around a rotation axis while changing the orientation of the mirror surface Inserting the mirror into a tire cavity region by swiveling the mirror around the rotation axis, and setting the mirror at an imaging position; Irradiating the inner surface of the tread with a slit light, and scanning the slit light along the inner surface of the tread; During scanning of the slit light, the line irradiation area on the inner surface of the tread formed by the irradiation of the slit light is imaged by the camera from the direction inclined in the tire circumferential direction via the mirror, and image data is output.
- the camera is a fixed focus camera and includes a mechanism for changing a distance of an optical path between the mirror and the camera.
- the step of setting the mirror at the imaging position includes setting the mirror from a position where the mirror is arranged so that an outer periphery of a part of the imaging device inserted into the opening is smaller than an inner periphery of the tire. It is preferable that the mirror is pivoted to the imaging position according to the rotation amount.
- a secondary mirror that directs the light reflected by the mirror toward the light receiving surface of the camera is provided in the optical path between the camera and the mirror of the reflected light of the line irradiation region.
- the imaging device includes a tread inner surface imaging optical system including the light source, the mirror, and the camera as a tread inner surface light source, a tread inner surface mirror, and a tread inner surface camera.
- the line irradiation area formed by irradiating the side inner surface with slit light from the side inner surface light source is imaged by the side inner surface camera from the direction inclined in the tire circumferential direction via the side inner surface mirror, and image data
- a more specific aspect of the present invention is the following tire inner surface imaging method. That is, this is a tire inner surface imaging method in which at least one of a tire or an imaging device is rotated around the tire axis, and the tire inner surface is imaged over one circumference in the tire circumferential direction.
- this tire inner surface imaging method the tire inner surface is divided into three or more parts in the tire width direction and provided for each part, and the tire inner surface is irradiated with slit light at the same time.
- An imaging apparatus having an optical system that captures an image and outputs image data is used.
- At least a part of the mirror including the second mirror of each optical system is inserted into the tire cavity region, and in each of the optical systems, the mirror is inserted when at least a part of the mirror including the second mirror is inserted into the tire cavity region. Is changed so that the outer periphery of the insertion portion becomes smaller than the inner periphery of the tire, and the position of the mirror is changed to a position suitable for imaging after the insertion. Thereafter, the optical system corresponds so that the slit light is emitted from the light source, the slit light emitted from the light source is reflected by the first mirror, and the surface of the reflected slit light extends in the tire width direction. Irradiate a portion of the tire inner surface.
- the slit light irradiated from the first mirror to the tire inner surface and reflected by the tire inner surface is incident by the second mirror and reflected toward the third mirror, and the slit light reflected by the second mirror is Reflected toward the entrance of the camera by three mirrors, the slit light reflected by the third mirror is received by the camera, the inner surface of the tire irradiated with the slit light is imaged, and the captured image data is externally Output to.
- the tire inner surface imaging method at least a part of the mirrors including the second mirror of each optical system is inserted into the tire during the tire inner surface imaging. Thereafter, slit light is emitted from each light source, and the slit light is reflected by the first mirror and applied to a predetermined portion of the tire inner surface so as to extend in the tire width direction.
- the slit light reflected from the tire inner surface enters the second mirror and is reflected toward the third mirror. Further, the slit light reflected by the second mirror is reflected by the third mirror toward the entrance of the camera, and the inner surface of the tire irradiated with the slit light is imaged by the camera.
- the captured image data is simultaneously output to the outside.
- the device is A light source that irradiates slit light on the inner surface of the tread of the tire; A mirror that reflects the reflected light of the line irradiation region of the inner surface of the tread formed by irradiation of the slit light; By receiving the reflected light reflected from the mirror, and imaging the line irradiation region from the direction inclined in the tire circumferential direction, and outputting image data, Inner surface measurement having an outer periphery smaller than an inner periphery of the opening of the tire, provided with the light source, the mirror, and a camera, and a mechanism for the mirror to turn around the rotation axis while changing the direction of the surface of the mirror Stage, And a control device that controls the rotational movement of the mirror by controlling the amount of rotation of the rotating shaft.
- the control device is configured to take an image of the line irradiation region by the camera when the mirror is inserted into a tire cavity region by turning the mirror around the rotation axis and the mirror is set at an imaging position.
- a control signal for the amount of rotation of the rotating shaft is generated according to the outer diameter of the tire so that the inclination angle is within an allowable range.
- the camera is a fixed focus camera
- the tire inner surface imaging device includes a mechanism for moving the camera so as to change a distance of an optical path between the mirror and the camera.
- control device pivots the mirror from a position where the mirror is arranged so that an outer periphery of the inner surface measurement stage is smaller than an inner periphery of the tire by using the control signal.
- a secondary mirror that directs the light reflected by the mirror toward the light receiving surface of the camera is provided in the optical path between the camera and the mirror of the reflected light of the line irradiation region.
- slit light is formed on a side inner surface of the tire inner surface.
- a more specific aspect of the present invention is a tire inner surface imaging device that images at least one of the tire and the imaging device around the tire axis and images the tire inner surface over one circumference in the tire circumferential direction. It is.
- This tire inner surface imaging device An inner surface measurement stage having an outer periphery smaller than an inner periphery of the opening of the tire; Provided on the inner surface measurement stage, the tire inner surface is divided into three or more portions in the width direction and provided for each portion, and the slit inner surface is irradiated with slit light, and the tire inner surface is irradiated with the slit light. And an optical system that outputs image data.
- the optical system is A light source that emits the slit light; A first mirror that reflects the slit light emitted from the light source and irradiates a portion of the tire inner surface corresponding to the optical system so that a surface of the reflected slit light extends in the tire width direction; A second mirror that is incident on the tire inner surface from the first mirror and is reflected by the tire inner surface and is reflected toward the third mirror; The third mirror for reflecting the slit light reflected by the second mirror toward the entrance of the camera; Receiving the slit light reflected by the third mirror, imaging the inner surface of the tire irradiated with the slit light, and outputting the captured image data to the outside; When inserting at least a part of the mirror including the second mirror together with the inner surface measurement stage into the tire, the outer circumference of the insertion portion is smaller than the inner circumference of the tire opening. Means for changing the position of the second mirror.
- the tire inner surface imaging device of the above aspect at the time of imaging the tire inner surface, at least a part including the second mirror of each optical system is inserted into the tire together with the inner surface measurement stage. Thereafter, slit light is emitted from each light source, and the slit light is reflected by the first mirror and applied to a predetermined portion of the tire inner surface so as to extend in the tire width direction.
- the slit light reflected from the tire inner surface enters the second mirror and is reflected toward the third mirror. Further, the slit light reflected by the second mirror is reflected by the third mirror toward the entrance of the camera, and the inner surface of the tire irradiated with the slit light is imaged by the camera.
- the captured image data is simultaneously output to the outside.
- the tire since the rotation amount of the rotating shaft for performing the turning movement of the mirror is set according to the outer diameter dimension of the tire, the tire has various tire outer diameter dimensions.
- the inner surface of the tire can be imaged in a short time.
- each optical system is provided for each part obtained by dividing the inner surface of the tire into three or more parts in the width direction, at least one of the tire and the imaging device is centered around the rotation center axis of the tire.
- the entire area of the tire inner surface can be imaged over one circumference of the tire in the circumferential direction. Therefore, it is possible to significantly reduce the time for imaging the entire tire inner surface as compared with the conventional case.
- the mirror of each optical system has only to be inserted into the tire cavity region, the size of the portion to be inserted into the tire cavity region can be made smaller than before. Thereby, the optical system for imaging the whole inner surface of the tire can be driven simultaneously.
- the tire cavity region in the present specification refers to a region of a space surrounded by a tire and a rim that is filled with air when the tire mounted on the rim is filled with air.
- the tire inner surface refers to a surface of the tire surface that faces the tire cavity region.
- the tire inner surface includes a tread inner surface at a position corresponding to the tread portion of the tire, and includes a side inner surface at a position corresponding to the side portion. Including.
- the side inner surface includes two surfaces corresponding to both sides of the tire. In this specification, one surface is referred to as a side upper surface, and the other surface is referred to as a side lower surface.
- an imaging device including a light source for a tread inner surface, a tread inner surface mirror, and a tread inner surface camera is used.
- the imaging device is configured such that the tread inner surface mirror pivots around the rotation axis while changing the direction of the surface of the tread inner surface mirror.
- a part of the imaging device is inserted into the opening of the tire.
- the opening portion is an opening portion surrounded by the bead base region of the tire, and refers to a portion where the rim is disposed when the tire is mounted on the rim.
- the rotation axis is parallel to the tire rotation center axis, and the rotation axis is inserted offset from the tire rotation center axis.
- the tread inner surface mirror is swung to insert the tread inner surface mirror into the tire cavity region, and the tread inner surface mirror is set at the imaging position.
- the light source for the tread inner surface irradiates slit light on the inner surface of the tread of the tire, and scans the slit light along the inner surface of the tread.
- the tread inner surface camera captures image data from the direction in which the line irradiation area of the inner surface of the tread formed by the irradiation of the slit light is inclined in the tire circumferential direction via the mirror for the inner surface of the tread. Is output.
- the rotation amount of the rotation shaft is set in accordance with the outer diameter of the tire so that the inclination angle of imaging by the tread inner surface camera is within an allowable range.
- the rotation amount of the rotating shaft that pivots the tread imaging mirror according to the outer diameter size of the tire is set so that the inclination angle of the imaging by the tread inner surface camera is within an allowable range. Therefore, stable image data can be output regardless of the outer diameter of the tire.
- the tire inner surface imaging device 1 includes a disk-shaped or substantially disk-shaped inner surface measuring stage 11 and a support column fixed vertically to the center of the upper surface of the inner surface measuring stage 11. 12 is provided.
- the inner surface measurement stage 11 is cut at approximately 120 degrees along the outer periphery and is divided into three regions, that is, a first region, a second region, and a third region. Each region is provided with an optical system for imaging the tire inner surface.
- the inner surface measuring stage 11 is inserted into the tire through the opening 2a of the tire 2 as shown in FIG.
- the outer periphery of the inner surface measurement stage 11 is smaller than the inner periphery of the opening 2a, that is, the inner periphery of the bead base region of the tire so that the inner surface measurement stage 11 can be inserted into the opening 2a.
- it is comprised so that turning movement of the mirror inserted in a tire cavity area
- the first optical system 100 for imaging the side upper surface in tire 2 is provided in the 1st field.
- the first optical system 100 includes a light source 101 that emits slit light, first to third mirrors 102, 103, 104, and a camera 105.
- the light source 101 is a side inner surface light source that forms a line irradiation region by irradiating slit light onto a side upper surface that is one of the side inner surfaces.
- the first mirror 102 is fixed to the tip of the light source 101.
- the first mirror 102 is a slit emitted from the light source 101 so that the incident angle of the slit light incident on the side upper surface inside the tire 2 is perpendicular to the tire circumferential direction and the slit light is extended and irradiated in the tire width direction. Reflects light.
- the first mirror 102 is located within the outer periphery of the inner surface measurement stage 11.
- the second mirror 103 is fixed to one end side of the support member 106, and the support member 106 is coupled to the rotation drive mechanism 107 on the other end side. As a result, the second mirror 103 can pivot around the rotation axis of the rotation drive mechanism 107. At this time, the direction of the mirror also changes with the turning movement.
- the second mirror 103 reflects the reflected light of the slit light from the line irradiation region so that the camera 105 images the line irradiation region irradiated with the slit light from the direction inclined in the tire circumferential direction. Thus, it is a side inner surface mirror that leads to the camera 105.
- the support member 106 and the second mirror 103 are rotated about the rotation axis perpendicular to the upper surface of the inner surface measurement stage 11 by the rotation of the stepping motor of the rotation drive mechanism 107.
- the second mirror 103 pivots around the rotation axis. 3, 4, and 7, the second mirror 103 is positioned at a predetermined position in the outer periphery of the inner surface measurement stage 11, and at the time of imaging, as shown in FIGS.
- the second mirror 103 is positioned outside the outer circumference of the inner surface measurement stage 11 and is disposed at a position (imaging position) where the reflected light from the upper surface inside the tire can be received.
- the turning movement of the mirror 103 is controlled.
- the second mirror 103 is located outside the outer periphery of the inner surface measurement stage 11, it is located in the tire cavity region.
- the third mirror 104 is fixed within the outer periphery of the inner surface measurement stage 11 by the support member 104a at a position where the reflected light of the slit light reflected by the second mirror 103 can be reflected toward the entrance of the camera 105 and further toward the light receiving surface. ing.
- the third mirror 104 is provided in the optical path between the camera 105 and the second mirror 103 of the reflected light of the line irradiation region, and directs the light reflected by the second mirror 103 to the entrance of the camera 105 and further to the light receiving surface. It is a secondary mirror.
- the camera 105 is attached to a fixed column fixed vertically to the inner surface measurement stage 11 via a movable mechanism 108.
- the camera 105 is a side inner surface camera that captures an image of a line irradiation region on the inner surface of the tread from a direction inclined in the tire circumferential direction via the second mirror 103 and outputs image data.
- the camera 105 is provided with a fixed focus lens, and is moved along the optical path between the lens of the camera 105 and the third mirror 104 and further the second mirror 103 by the movable mechanism 108 along the fixed column. The focus of the image of the line irradiation area is adjusted by changing the distance.
- the movable mechanism unit 108 is operated by a stepping motor, and the stepping motor is driven and controlled by a computer device described later.
- a second optical system 200 for imaging the inner surface of the tread in the tire 2 is provided in the second region.
- the second optical system 200 includes a light source 201 that emits slit light, first to third mirrors 202, 203, 204, and a camera 205.
- the light source 201 is a light source for the inner surface of the tread that irradiates the inner surface of the tread with slit light to form a line irradiation region.
- the first mirror 202 is fixed to the tip of the light source 201.
- the first mirror 202 reflects the slit light emitted from the light source 201 and makes the incident angle of the slit light incident on the inner surface of the tread inside the tire 2 perpendicular to the tire circumferential direction and extends the slit light in the width direction of the tire.
- the slit light emitted from the light source 201 is reflected so as to be irradiated.
- the first mirror 202 is located within the outer periphery of the inner surface measurement stage 11.
- the second mirror 203 is fixed to one end side of the support member 206, and the support member 206 is connected to the rotation drive mechanism unit 207 on the other end side. As a result, the second mirror 203 can turn around the rotation axis of the rotation drive mechanism 207. At this time, the direction of the mirror also changes with the turning movement.
- the second mirror 203 reflects the reflected light from the line irradiation region and guides it to the camera 205 so that the camera 205 captures the line irradiation region from the direction inclined in the tire circumferential direction. It is a mirror.
- the support member 206 and the second mirror 203 are rotated about the rotation axis perpendicular to the upper surface of the inner surface measurement stage 11 by the rotation of the stepping motor of the rotation drive mechanism unit 207.
- the second mirror 203 pivots around the rotation axis. 3, 4, and 9, the second mirror 203 is positioned at a predetermined position within the outer periphery of the inner surface measurement stage 11, and at the time of imaging, as shown in FIGS.
- the second mirror 203 is positioned outside the outer circumference of the inner surface measurement stage 11 and is disposed at a position (imaging position) where the reflected light from the upper surface inside the tire can be received.
- the turning movement of the mirror 203 is controlled.
- the second mirror 203 is located outside the outer periphery of the inner surface measurement stage 11, it is located in the tire cavity region.
- the third mirror 204 is fixed within the outer periphery of the inner surface measurement stage 11 by a support member 204a at a position where the slit light reflected by the second mirror 203 can be reflected toward the entrance of the camera 205 and further toward the light receiving surface.
- the third mirror 204 is provided in the optical path between the camera 205 and the second mirror 203 of the reflected light of the line irradiation region, and directs the light reflected by the second mirror 203 to the entrance of the camera 205 and further to the light receiving surface. It is a secondary mirror.
- the camera 205 is attached to a fixed column fixed vertically to the inner surface measurement stage 11 via a movable mechanism 208.
- the camera 205 is a tread inner surface camera that captures a line irradiation region on the inner surface of the tread from a direction inclined in the tire circumferential direction via the second mirror 203 and outputs image data.
- the camera 205 is provided with a fixed focus lens, and is moved along the optical path between the lens of the camera 205 and the third mirror 204 and further the second mirror 203 by the movable mechanism 208 along the fixed column. The focus of the image of the line irradiation area is adjusted by changing the distance.
- the movable mechanism 208 is operated by a stepping motor, and the stepping motor is driven and controlled by a computer device described later.
- the turning movement of the second mirror 203 is controlled in accordance with the tire outer diameter, and the distance from the line irradiation region on the inner surface of the tread to the second mirror 203 changes. Therefore, a mechanism for changing the distance of the optical path between the camera 205 and the second mirror 203 is provided so that the distance along the optical path to the line irradiation region of the camera 205 having the fixed focus lens is constant. preferable.
- a first optical system 300 for imaging the lower side surface in the tire 2 includes a light source 301 that emits slit light, first to third mirrors 302, 303, and 304, and a camera 305.
- the light source 301 is a side inner surface light source that forms a line irradiation region by irradiating slit light onto a side lower surface that is one of the side inner surfaces.
- the first mirror 302 is fixed to the tip of the light source 301.
- the first mirror 302 is a slit emitted from the light source 301 so that the incident angle of the slit light incident on the lower side surface inside the tire 2 is perpendicular to the tire circumferential direction and the slit light is extended and irradiated in the tire width direction. Reflects light.
- the first mirror 302 is located within the outer periphery of the inner surface measurement stage 11.
- the second mirror 303 is fixed to one end side of the support member 306, and the support member 306 is connected to the rotation drive mechanism unit 307 on the other end side. As a result, the second mirror 303 can turn around the rotation axis of the rotation drive mechanism 307. At this time, the direction of the mirror also changes with the turning movement.
- the second mirror 303 reflects the reflected light of the slit light from the line irradiation region and guides it to the camera 305 so that the camera 305 images the line irradiation region from the direction inclined in the tire circumferential direction. This is a side inner surface mirror.
- the support member 306 and the second mirror 303 are rotated around the rotation axis perpendicular to the upper surface of the inner surface measurement stage 11 by the rotation of the stepping motor of the rotation drive mechanism unit 307.
- the second mirror 303 pivots around the rotation axis. 3, 4, and 7, the second mirror 303 is positioned at a predetermined position in the outer periphery of the inner surface measurement stage 11, and at the time of imaging, the second mirror 303 is shown in FIGS.
- the second mirror 303 is positioned outside the outer periphery of the inner surface measurement stage 11 and is disposed at a position (imaging position) where the reflected light from the upper surface inside the tire can be received.
- the turning movement of the mirror 303 is controlled.
- the second mirror 303 is located outside the outer periphery of the inner surface measurement stage 11, it is located in the tire cavity region.
- the third mirror 304 is fixed within the outer periphery of the inner surface measurement stage 11 by a support member at a position where the reflected light of the slit light reflected by the second mirror 303 can be reflected toward the entrance of the camera 305 and further toward the light receiving surface. .
- the third mirror 304 is provided in the optical path between the camera 305 and the second mirror 303 of the reflected light of the line irradiation region, and directs the light reflected by the second mirror 303 to the entrance of the camera 305 and further to the light receiving surface. It is a secondary mirror.
- the camera 305 is attached to a fixed column fixed vertically to the inner surface measurement stage 11 via a movable mechanism unit 308.
- the camera 305 is a side inner surface camera that captures an image of a line irradiation region on the inner surface of the tread from a direction inclined in the tire circumferential direction via the second mirror 103 and outputs image data.
- the camera 305 includes a fixed focus lens, and is moved along the optical path between the lens of the camera 305, the third mirror 304, and further the second mirror 303 by the movable mechanism unit 308 along the fixed column. The focus of the image of the line irradiation area is adjusted by changing the distance.
- the distance along the optical path between the line irradiation region and the camera 305 can be made constant regardless of the tire outer diameter.
- the movable mechanism unit 308 is operated by a stepping motor, and the stepping motor is driven and controlled by a computer device described later.
- the stepping motors 107a, 207a, and 307a of the rotation driving mechanism units 107, 207, and 307 of each optical system and the stepping motors 108a, 208a, and 308a of the movable mechanism units 108, 208, and 308 are controlled signals.
- the drive is controlled by the computer device 500 via the distribution unit 400.
- the control signal distribution unit 400 includes a controller 401 and two stepping drivers 402 and 403.
- the control signal for driving output from the computer device 500 is input to the controller 401, and the controller 401 distributes the control signal to the stepping driver 402 for the rotational drive mechanism and the stepping driver 403 for the movable mechanism.
- the computer device 500 is a control device that controls the rotational movement of the second mirror 203, which is a tread inner surface mirror fixed to the support member 206, by controlling the amount of rotation of the rotation shaft of the support member 206. More specifically, when the computer apparatus 500 turns the second mirror 203 so as to be inserted into the tire cavity region and sets the second mirror 203 at the imaging position, the imaging of the line irradiation region by the camera 205 is performed. A control signal for the amount of rotation of the rotating shaft is generated in accordance with the outer diameter of the tire so that the inclination angle of the tire falls within an allowable range.
- the second mirrors 103 and 303 also turn around the rotation axes of the support members 106 and 306 so as to be inserted into the tire cavity region while changing their orientation.
- the device 1 is inserted into the opening 2a of the tire, and the rotation axis for the turning movement of the second mirror 203 is parallel to the tire rotation center axis, and this rotation axis is offset with respect to the tire rotation center axis. Is in a state.
- the stepping driver 402 generates drive signals for driving the stepping motors 107a, 207a, and 307a of the rotation drive mechanisms 107, 207, and 307 based on control signals sent from the computer device 500 via the controller 401, and generates stepping motors. It outputs to 107a, 207a, 307a.
- the stepping driver 403 generates drive signals for driving the stepping motors 108a, 208a, and 308a of the movable mechanism portions 108, 208, and 308 based on the control signals sent from the computer device 500 via the controller 401, and generates the drive signals. It outputs to stepping motor 108a, 208a, 308a.
- the second mirrors 103, 203, 303 of the optical systems 100-300 are closed, that is, the second mirrors 103, 203, 303 are
- the inner surface measuring stage 11 is inserted into the opening 2 a of the tire 2 with the support column 12 positioned at the center of the inner surface measuring stage 11 being aligned with the rotation center axis of the tire 2 while being positioned within the outer periphery of the inner surface measuring stage 11. .
- the apparatus 1 does not interfere with the bead base region surrounding the opening 2 a of the tire 2.
- the second mirrors 103, 203, and 303 of the respective optical systems 100 to 300 are rotated and deployed.
- slit light is emitted from the light sources 101, 201, and 301 of the optical systems 100 to 300, and the movable mechanisms 108, 208, and 308 are driven to adjust the positions of the cameras 105, 205, and 305.
- the apparatus 1 or the tire 2 is rotated once in the tire circumferential direction while acquiring image data output from all of the cameras 105, 205, and 305 of 100 to 300 by an external apparatus.
- the size of the portion to be inserted into the tire cavity region is conventionally set. Can be made smaller. Thereby, the three optical systems 100, 200, 300 for imaging the entire inner surface of the tire 2 can be driven simultaneously.
- the entire area of the tire inner surface can be imaged over the entire circumference of the tire only by rotating the device 1 or the tire 2 once in the tire circumferential direction. Therefore, it is possible to significantly reduce the time for imaging the entire tire inner surface as compared with the conventional case.
- the second mirror 103 is inside the tire 2. Rotate to move and expand. In this state, slit light is emitted from the light source 101 and the movable mechanism unit 108 is driven to adjust the position of the camera 105.
- the slit light emitted from the light source 101 is reflected by the first mirror 102 and applied to the side upper surface 21 of the tire 2 to form a line irradiation region 31.
- the slit light reflected by the side upper surface 21 enters the second mirror 103 and is reflected by the second mirror 103 toward the third mirror 104.
- the slit light incident on the third mirror 104 is reflected by the third mirror 104 toward the entrance of the camera 105 and further toward the light receiving surface.
- the second mirror 203 is pivoted inside the tire. And expand. That is, the rotation amount by which the second mirror 203 is set from the first position where the second mirror 203 is arranged so that the outer periphery of the portion of the device 1 inserted into the opening of the tire is smaller than the inner periphery of the tire. Accordingly, the second mirror 203 is pivoted to place the second mirror 203 at the imaging position. In this state, slit light is emitted from the light source 201 and the movable mechanism unit 208 is driven to adjust the position of the camera 205.
- the slit light emitted from the light source 201 is reflected by the first mirror 202 and applied to the inner surface 22 of the tread of the tire 2 to form a line irradiation region 32.
- the reflected light of the slit light reflected by the tread inner surface 22 enters the second mirror 203 and is reflected by the second mirror 203 toward the third mirror 204.
- the reflected light incident on the third mirror 204 is reflected by the third mirror 204 toward the entrance of the camera 205 and further toward the light receiving surface.
- the second mirror 203 reflects the field of view of the image of the line irradiation area of the slit light on the inner surface of the tread viewed from a direction inclined about 30 degrees in the tire circumferential direction on the third mirror 204. reflect. That is, the camera 205 captures an image of the line irradiation area from a direction inclined in the tire circumferential direction via the second mirror 203 and outputs image data.
- the inclination angle of the imaging of the line irradiation area on the inner surface 22 of the tread is aligned with an allowable range, for example, about 30 degrees, specifically, Align within the range of 30 degrees ⁇ ⁇ .
- the line irradiation region can be imaged from the minimum diameter tread inner surface B1 to the maximum diameter tread inner surface B2. That is, in the drawing, the reflection angle at the tread inner surface B1 having the smallest diameter is 30 + ⁇ degrees, and the incident angle and the reflection angle at the second mirror 203 at this time are 60 ⁇ degrees.
- the reflection angle at the tread inner surface B2 having the maximum diameter is 60 ⁇ degrees
- the incident angle and the reflection angle at the second mirror 203 at this time are 60 + ⁇ degrees. If the inclination angle of the imaging of the line irradiation area is reduced, the image of the line irradiation area to be imaged increases to the extent that it is deformed from a straight line and may protrude from the field of view of the second mirror 203. On the other hand, since the second mirror 203 is inserted into the tire cavity region, the size of the second mirror is also limited and cannot be increased. On the other hand, when the inclination angle of imaging of the line irradiation region is increased, the resolution of the shape data calculated by the processing based on the light cutting method is lowered.
- the allowable range is set to 30 ⁇ ⁇ degrees.
- ⁇ is preferably an angle of, for example, 5 degrees or less.
- the central angle of the allowable range of the present embodiment is 30 degrees, but it is preferable that the angle is in the range of 25 to 35 degrees.
- the second mirror 303 is pivoted and moved inside the tire. And expand. In this state, slit light is emitted from the light source 301 and the movable mechanism unit 308 is driven to adjust the position of the camera 305.
- the slit light emitted from the light source 301 is reflected by the first mirror 302 and applied to the side lower surface 23 of the tire 2 to form a line irradiation region 33.
- the reflected light of the slit light reflected by the side lower surface 23 enters the second mirror 303 and is reflected by the second mirror 303 toward the third mirror 304.
- the reflected light incident on the third mirror 304 is reflected by the third mirror 304 toward the entrance of the camera 305 and further toward the light receiving surface.
- the respective imaging ranges are set so that a part of the adjacent line irradiation regions 31, 32, 33 overlap in the tire width direction or the tire radial direction. That is, the line irradiation region 31 on the side upper surface 21 and the line irradiation region 32 on the tread inner surface 22 have an overlap of the width D1. Further, the line irradiation region 32 on the inner surface 22 of the tread and the line irradiation region 33 on the side lower surface 23 have an overlap of width D2. Thereby, it is prevented that the area
- the widths D1 and D2 are set to 10 mm or more.
- each optical system 100, 200, 300 is provided for each part obtained by dividing the inner surface of the tire 2 into three parts in the width direction. Therefore, the slit light can be scanned along the tire circumferential direction by rotating at least one of the tire 2 and the imaging device 1 around the axis of the tire 2 in the tire circumferential direction. The whole area of the tire inner surface can be imaged over one circumference in the circumferential direction of the tire. Therefore, it is possible to significantly reduce the time for imaging the entire tire inner surface as compared with the conventional case.
- the size of the portion to be inserted into the tire 2 is conventionally increased. Can be made smaller. Thereby, the three optical systems 100, 200, 300 for imaging the entire inner surface of the tire 2 can be driven simultaneously.
- the positions of the second mirrors 103, 203, and 303 can be changed by turning, and the positions of the cameras 105, 205, and 305 can be changed by moving. Even if 2 is replaced and the size of the tire 2, that is, the outer diameter of the tire is slightly changed, the entire area of the tire inner surface can be imaged.
- the development positions of the second mirrors 103, 203, and 303, that is, the imaging positions are stored in advance for each tire outer diameter dimension of the tire, and the tire outer diameter dimension of the tire is set in the computer device 500. The imaging positions of the two mirrors 103, 203, and 303 are set so that positioning can be performed.
- the inner surface of the tire 2 is divided into three parts, that is, the side upper surface 21, the tread inner surface 22, and the side lower surface 23.
- the number of divided regions is changed depending on the size of the tire 2, and the optical system is divided for each divided region. Is preferably provided. Since the diameter of the opening 2a of the tire 2 increases as the size of the tire 2 increases, the diameter of the inner surface measurement stage 11 can be increased, whereby the inner surface measurement stage 11 is moved along the outer periphery of the inner surface measurement stage 11 by 120. It becomes possible to arrange in a range divided by an angle of less than or equal to degrees, and it is possible to mount three or more optical systems on the inner surface measurement stage 11. For example, when the tire size is large, the side upper surface 21 may be divided into a plurality of parts, the tread inner surface 22 may be divided into a plurality of parts, and the side lower surface 23 may be divided into a plurality of parts.
- the positions of the light sources 101, 201, 301 and the cameras 105, 205, 305 are not limited to the positions described in the present embodiment, and the arrangement can be changed by changing the angle of each mirror.
- a light source that emits laser sheet light may be used as the light sources 101, 201, and 301 that emit slit light.
- the stepping motor is used for the turning movement of the second mirrors 103, 203, and 303 and the movement of the cameras 105, 205, and 305.
- the present invention is not limited to this.
- the present invention relates to a tire inner surface imaging method and apparatus capable of imaging the entire tire inner surface in a short time.
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Abstract
Description
光源、ミラー、及びカメラを備え、前記ミラーが、前記ミラーの面の向きを変えながら回転軸の周りに旋回移動するように構成された撮像装置の一部をタイヤの開口部に挿入した状態で、前記ミラーを前記回転軸の周りに旋回移動させることにより前記ミラーをタイヤ空洞領域内に挿入して前記ミラーを撮像位置にセットするステップと、
タイヤのトレッド内面にスリット光を照射し、前記スリット光を前記トレッド内面に沿って走査するステップと、
前記スリット光の走査中、前記スリット光の照射により形成される前記トレッド内面のライン照射領域を、前記ミラーを経由してタイヤ周方向に傾斜させた方向から前記カメラで撮像して画像データを出力するステップと、を含む。
前記ミラーを前記タイヤ空洞領域内に挿入するとき、前記カメラによる撮像の傾斜角度が許容範囲内になるように、タイヤの外径寸法に応じて前記回転軸の回転量が設定される。
前記ミラーを撮像位置にセットするステップは、前記サイド内面用ミラーをタイヤ空洞領域内に挿入するように旋回移動させることを含む、ことが好ましい。
すなわち、タイヤの軸を中心にしてタイヤ或いは撮像装置の少なくとも何れか一方を回転して、タイヤの周方向1周にわたってタイヤ内面を撮像するタイヤ内面撮像方法である。このタイヤ内面撮像方法では、タイヤ内面をタイヤ幅方向に3つ以上の部位に分割して各部位毎に設けられるとともに、タイヤ内面に同時にスリット光を照射し、スリット光が照射されたタイヤ内面を撮像して画像データを出力する光学系を備えた撮像装置を用いる。各光学系の第2ミラーを含む少なくとも一部のミラーをタイヤ空洞領域に挿入し、前記各光学系では、前記第2ミラーを含む少なくとも一部のミラーをタイヤ空洞領域に挿入するときに、ミラーの位置を変化させて該挿入部位の外周が前記タイヤの内周よりも小さくなるようにし、挿入後にミラーの位置を撮像に適した位置に変化させる。この後、光源から前記スリット光を出射し、前記光源から出射されたスリット光を第1ミラーによって反射して、反射したスリット光の面がタイヤ幅方向に延びるように、該光学系が対応する前記タイヤ内面の部位に照射する。前記第1ミラーから前記タイヤ内面に照射され前記タイヤ内面によって反射されたスリット光を前記第2ミラーによって入射して第3ミラーに向けて反射し、前記第2ミラーによって反射されたスリット光を第3ミラーによってカメラの入射口に向けて反射し、前記カメラにより、前記第3ミラーによって反射されたスリット光を受光して前記スリット光が照射されたタイヤ内面を撮像し、撮像した画像データを外部に出力する。
タイヤのトレッド内面にスリット光を照射する光源と、
前記スリット光の照射により形成される前記トレッド内面のライン照射領域の反射光を反射するミラーと、
前記ミラーから反射した前記反射光を受光することにより、前記ライン照射領域をタイヤ周方向に傾斜させた方向から撮像して画像データを出力するカメラと、
前記光源、前記ミラー、及びカメラと、前記ミラーが前記ミラーの面の向きを変えながら回転軸の周りを旋回移動する機構、が設けられ、前記タイヤの開口部内周よりも小さい外周を有する内面計測ステージと、
前記回転軸の回転量を制御して、前記ミラーの旋回移動を制御する制御装置と、を含む。
前記制御装置は、前記ミラーを前記回転軸の周りに旋回移動させることにより前記ミラーをタイヤ空洞領域内に挿入して前記ミラーを撮像位置にセットするとき、前記カメラによる前記ライン照射領域の撮像の傾斜角度が許容範囲内になるように、タイヤの外径寸法に応じて前記回転軸の回転量の制御信号を生成するように構成されている。
このタイヤ内面撮像装置は、
前記タイヤの開口部内周よりも小さい外周を有する内面計測ステージと、
前記内面計測ステージ上に設けられ、タイヤ内面を幅方向に3つ以上の部位に分割して各部位毎に設けられるとともに、タイヤ内面に同時にスリット光を照射し、スリット光が照射されたタイヤ内面を撮像して画像データを出力する光学系とを備える。
前記光学系は、
前記スリット光を出射する光源と、
前記光源から出射されたスリット光を反射し、反射したスリット光の面がタイヤ幅方向に延びるように、該光学系が対応する前記タイヤ内面の部位に照射する第1ミラーと、
前記第1ミラーから前記タイヤ内面に照射され前記タイヤ内面によって反射されたスリット光を入射して第3ミラーに向けて反射する第2ミラーと、
前記第2ミラーによって反射されたスリット光をカメラの入射口に向けて反射する前記第3ミラーと、
前記第3ミラーによって反射されたスリット光を受光し、前記スリット光が照射されたタイヤ内面を撮像し、撮像した画像データを外部に出力する前記カメラと、
前記内面計測ステージと共に前記第2ミラーを含む少なくとも一部のミラーをタイヤ内に挿入するときに、該挿入部位の外周が前記タイヤ開口部の内周よりも小さくなるように前記各光学系の前記第2ミラーの位置を変化させる手段と、を備えている。
タイヤ内面は、タイヤ表面のうち、タイヤ空洞領域に面する面をいい、タイヤ内面には、タイヤのトレッド部に対応した位置にあるトレッド内面を含み、サイド部に対応した位置にあるサイド内面を含む。サイド内面は、タイヤの両サイドに対応して2つの面を含む。本明細書では、1つの面をサイド上面、他方の面をサイド下面という。
このように、本実施形態のタイヤ内面撮像では、タイヤの外径寸法に応じて、トレッド撮像用ミラーを旋回移動させる回転軸の回転量を、トレッド内面用カメラによる撮像の傾斜角度が許容範囲内になるように定めることができるので、タイヤの外径寸法に関わらず、安定した画像データを出力することができる。特に、光切断法に基づくデータ処理によって、一定の高分解能を維持し、精度の高いタイヤ内面の形状データを画像データから安定して得るためには、タイヤの外径寸法に関わらず、ライン照射領域の撮像時の傾斜角度を一定の傾斜角度を含む許容範囲内に維持することが好ましい。この点から、タイヤの外径寸法に応じて、トレッド撮像用ミラーを旋回移動させる回転軸の回転量を設定して、トレッド内面用カメラによる撮像の傾斜角度が許容範囲内になるようにすることができる本実施形態のタイヤ内面の撮像は有効である。以下、タイヤ内面の撮像を行う装置及び方法を詳細に説明する。
光源201は、トレッド内面にスリット光が照射されライン照射領域を形成するトレッド内面用光源である。
可動機構部308はステッピングモータによって動作し、ステッピングモータは後述するコンピュータ装置によって駆動制御される。
コンピュータ装置500から出力された駆動のための制御信号はコントローラ401に入力され、コントローラ401によって回転駆動機構部用のステッピングドライバ402と可動機構部用のステッピングドライバ403に制御信号が分配される。コンピュータ装置500は、支持部材206の回転軸の回転量を制御して、支持部材206に固定されているトレッド内面用ミラーである第2ミラー203の旋回移動を制御する制御装置である。より具体的には、コンピュータ装置500は、第2ミラー203をタイヤ空洞領域内に挿入するように旋回移動させて、第2ミラー203を撮像位置にセットするとき、カメラ205によるライン照射領域の撮像の傾斜角度が許容範囲内になるように、タイヤの外径寸法に応じて上記回転軸の回転量の制御信号を生成するように構成されている。また、同様に、第2ミラー103,303も、向きを変えながら、タイヤ空洞領域内に挿入するように支持部材106,306の回転軸の周りに旋回移動する。このとき、装置1は、タイヤの開口部2aに挿入され、第2ミラー203の旋回移動のための回転軸がタイヤ回転中心軸に平行になり、この回転軸がタイヤ回転中心軸に対してオフセットした状態にある。
するものである。
11 内面計測ステージ
12 支持柱
2 タイヤ
2a 開口部
21 サイド上面
22 トレッド内面
23 サイド下面
31,32,33 撮像領域
100 第1光学系
101 光源
102,202,302 第1ミラー
103,203,303 第2ミラー
104,204,304 第3ミラー
105,205,305 カメラ
106,206,306 支持部材
107,207,307 回転駆動機構部
108,208,308 可動機構部
200 第2光学系
300 第3光学系
400 制御信号分配部
401 コントローラ
402,403 ステッピングドライバ
500 コンピュータ装置
Claims (10)
- タイヤ内面を撮像するタイヤ内面撮像方法であって、
光源、ミラー、及びカメラを備え、前記ミラーが、前記ミラーの面の向きを変えながら回転軸の周りに旋回移動するように構成された撮像装置の一部をタイヤの開口部に挿入した状態で、前記ミラーを前記回転軸の周りに旋回移動させることにより前記ミラーをタイヤ空洞領域内に挿入して前記ミラーを撮像位置にセットするステップと、
タイヤのトレッド内面にスリット光を照射し、前記スリット光を前記トレッド内面に沿って走査するステップと、
前記スリット光の走査中、前記スリット光の照射により形成される前記トレッド内面のライン照射領域を、前記ミラーを経由してタイヤ周方向に傾斜させた方向から前記カメラで撮像して画像データを出力するステップと、を含み、
前記ミラーを前記タイヤ空洞領域内に挿入するとき、前記カメラによる撮像の傾斜角度が許容範囲内になるように、タイヤの外径寸法に応じて前記回転軸の回転量が設定される、ことを特徴とするタイヤ内面撮像方法。 - 前記カメラは固定焦点カメラであり、前記ミラーと前記カメラとの間の光路の距離を変化させる機構を備える、請求項1に記載のタイヤ内面撮像方法。
- 前記ミラーを撮像位置にセットするステップは、前記開口部に挿入される前記撮像装置の部分の外周が前記タイヤの内周よりも小さくなるように前記ミラーを配置した位置から、前記ミラーを前記設定された回転量に従って、前記ミラーを前記撮像位置に旋回移動させる、請求項1または2に記載のタイヤ内面撮像方法。
- 前記ライン照射領域の反射光の、前記カメラと前記ミラーの間の光路に、前記ミラーで反射した光を前記カメラの受光面に向ける副ミラーが設けられる、請求項1~3のいずれか1項に記載のタイヤ内面撮像方法。
- 前記撮像装置は、前記光源、前記ミラー、及び前記カメラのそれぞれを、トレッド内面用光源、トレッド内面用ミラー及びトレッド内面用カメラとして備えるトレッド内面撮像用光学系の他に、前記タイヤ内面のうちのサイド内面にサイド内面用光源からスリット光を照射することにより形成されるライン照射領域を、サイド内面用ミラーを経由してタイヤ周方向に傾斜させた方向からサイド内面用カメラで撮像し、画像データを出力するサイド内面撮像用光学系、を含み、前記サイド内面用ミラーが、向きを変えながらサイド内面用回転軸の周りに旋回移動するように構成され、
前記ミラーを撮像位置にセットするステップは、前記サイド内面用ミラーをタイヤ空洞領域内に挿入するように旋回移動させることを含む、請求項1~4のいずれか1項に記載のタイヤ内面撮像方法。 - タイヤ内面を撮像するタイヤ内面撮像装置であって、
タイヤのトレッド内面にスリット光を照射する光源と、
前記スリット光の照射により形成される前記トレッド内面のライン照射領域の反射光を反射するミラーと、
前記ミラーから反射した前記反射光を受光することにより、前記ライン照射領域をタイヤ周方向に傾斜させた方向から撮像して画像データを出力するカメラと、
前記光源、前記ミラー、及びカメラと、前記ミラーが前記ミラーの面の向きを変えながら回転軸の周りを旋回移動する機構、が設けられ、前記タイヤの開口部内周よりも小さい外周を有する内面計測ステージと、
前記回転軸の回転量を制御して、前記ミラーの旋回移動を制御する制御装置と、を含み、
前記制御装置は、前記ミラーを前記回転軸の周りに旋回移動させることにより前記ミラーをタイヤ空洞領域内に挿入して前記ミラーを撮像位置にセットするとき、前記カメラによる前記ライン照射領域の撮像の傾斜角度が許容範囲内になるように、タイヤの外径寸法に応じて前記回転軸の回転量の制御信号を生成するように構成された、ことを特徴とするタイヤ内面撮像装置。 - 前記カメラは固定焦点カメラであり、前記ミラーと前記カメラとの間の光路の距離を変化させるように、前記カメラを移動する機構を備える、請求項6に記載のタイヤ内面撮像装置。
- 前記制御装置は、前記制御信号を用いて、前記前記内面計測ステージの外周が前記タイヤの内周よりも小さくなるように前記ミラーを配置した位置から、前記ミラーを旋回移動させる、請求項6または7に記載のタイヤ内面撮像装置。
- 前記ライン照射領域の反射光の、前記カメラと前記ミラーの間の光路に、前記ミラーで反射した光を前記カメラの受光面に向ける副ミラーが設けられる、請求項6~8のいずれか1項に記載のタイヤ内面撮像装置。
- 前記光源、前記ミラー、及び前記カメラのそれぞれを、トレッド内面用光源、トレッド内面用ミラー及びトレッド内面用カメラとして備えるトレッド内面用光学系の他に、前記タイヤ内面のうちのサイド内面にスリット光を照射するサイド内面用光源と、前記スリット光の照射により形成されるライン照射領域を撮像して画像データを出力するサイド内面用カメラと、前記サイド内面用カメラがタイヤ周方向に傾斜させた方向から撮像するように、前記ライン照射領域で反射した光の光路に設けられたサイド内面用ミラーと、を備えるサイド内面用光学系、を含み、前記サイド内面用ミラーが、向きを変えながらサイド内面用回転軸の周りに旋回移動するように構成されている、請求項6~9のいずれか1項に記載のタイヤ内面撮像装置。
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