Non-contact automatic measuring method and device for golf club

Abstract

Even an unskilled operator can measure the specification of a golf club, and the measurement can be quickly and accurately realized by a simple device. When a servo motor (20) is started to rotate the main shaft thereof, a moving table (16) moves along a rail (15) (in the x-axis direction). A laser light irradiator (25) for irradiating laser light and a digital camera (27) are disposed on a mobile station (16). Slit light 26 is irradiated from a laser light irradiator 25 from above a shaft 6 of a golf club 5. A digital camera (27) captures an image of the reflected light, captures an image of the semi-ellipse, and calculates the center line (7) of the shaft (6) on the basis of the shape. A wire groove (11) is also detected, and a base angle, a face inclination angle, and a face offset degree are calculated and obtained.

Description

Technical Field

[0001] The present invention relates to a non-contact automatic golf club measurement method and apparatus for non-contact measurement of loft, lie angle, face progression (FP), and other characteristics of golf clubs. More specifically, the present invention relates to a non-contact automatic golf club measurement method and apparatus for use in production processes, for example, to measure loft, lie angle, face progression (FP), and other characteristics of golf clubs, and to quickly and non-contactly determine whether production conforms to design. Background Art

[0002] Maintaining golf clubs to their designed dimensions is crucial. Loft, lie angle, and FP significantly influence the ball's trajectory. Furthermore, the quality of golf clubs is crucial to management during the production process, requiring accurate and rapid measurement of loft, lie angle, and FP. These specifications are thoroughly inspected by highly skilled personnel using measuring instruments during the production process and at the shipping stage. Meanwhile, to automate these measurements, a method has been proposed that uses a charge-coupled device (CCD) camera to capture images and automatically measure angles based on the resulting images (Patent Document 1). Furthermore, a measuring device has been proposed that automates measurement by irradiating laser light in the form of slit light (Patent Document 2). This measuring device utilizes two digital cameras, a laser slit projector, and two lighting devices. Furthermore, during measurement, the center axis of the golf club shaft must be positioned so that it overlaps with the optical axis of the digital camera in a perpendicular plane.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 3-198876

[0006] Patent Document 2: Japanese Patent Application Laid-Open No. 10-337344 Summary of the Invention

[0007] Problems to be solved by the invention

[0008] The measuring device described in Patent Document 1 cannot accurately measure angles, etc., using images from a CCD camera. Furthermore, the measuring device described in Patent Document 2 requires two cameras, a laser slit projector, and two lighting devices, making the device bulky. Furthermore, since the golf club shaft must be positioned vertically during measurement, the measurement device requires skill and time to operate, making it unsuitable for use in production processes.

[0009] The object of the present invention is to provide a non-contact automatic measurement method and device for golf clubs, by which even an unskilled operator can measure the specifications of the golf clubs.

[0010] Another object of the present invention is to provide a non-contact automatic measurement method and device for golf clubs, which can quickly and accurately measure the specifications of golf clubs using simple devices.

[0011] Technical means to solve the problem

[0012] The non-contact automatic measurement method for golf clubs of the present invention 1 is characterized in that:

[0013] In having:

[0014] A laser light irradiator for irradiating a golf club with laser light as slit light, and

[0015] A digital camera that captures the reflected light of the irradiated laser light as an image

[0016] In the golf club non-contact automatic measuring device, the following steps are performed:

[0017] a shaft holding step of placing and holding the shaft of the golf club;

[0018] a shaft image taking step of taking in a shaft image based on the outer shape of the shaft;

[0019] a shaft centerline calculation step of obtaining a shaft centerline of the shaft based on the shaft image;

[0020] a head image taking step of taking in a head image of the golf club head;

[0021] a score line calculation step of obtaining the score line of the golf club based on the club head image; and

[0022] a reference hitting face calculation step of obtaining a reference hitting face based on the club head image;

[0023] At least one selected from a lie angle, a loft angle, and a face offset is determined based on the shaft center line, the grooves, and the reference hitting surface.

[0024] The non-contact automatic measurement method for a golf club according to the second aspect of the present invention is the non-contact automatic measurement method for a golf club according to the first aspect of the present invention, characterized in that in the shaft image acquisition step and the club head image acquisition step, the laser light irradiator and the digital camera, or the golf club, are moved along the shaft centerline direction and irradiated with the slit light.

[0025] The non-contact automatic measurement method for golf clubs according to the third embodiment of the present invention is the method according to the second embodiment of the present invention, characterized in that the irradiation direction of the laser light is a direction at right angles to the center line of the shaft, and the shooting direction of the digital camera forms an angle with the irradiation direction of the laser light.

[0026] The non-contact automatic measuring device for golf clubs of the present invention 1 has the following features:

[0027] a laser light irradiator for irradiating the golf club with laser light as slit light;

[0028] a digital camera that captures the reflected light of the laser light subjected to the irradiation as an image;

[0029] a plurality of positioning blocks for placing and holding the shaft of the golf club in a horizontal direction; and

[0030] The relative moving means relatively moves the laser light irradiator and the digital camera along the center line of the shaft which is the center of the shaft placed on the positioning block.

[0031] The non-contact automatic measuring device for golf clubs of Invention 2 is the non-contact automatic measuring device for golf clubs according to Invention 1, and is characterized in that the relatively moving component carries the laser light irradiation device and the digital camera, or the golf club, on a moving platform and moves them on a guide rail through a screw drive.

[0032] The non-contact automatic measuring device for golf clubs according to the third embodiment of the present invention is the non-contact automatic measuring device for golf clubs according to the second embodiment of the present invention, wherein the laser light irradiator is arranged at an angular position so as to irradiate the golf club from a direction perpendicular to the center line of the shaft.

[0033] The digital camera has a photographing direction that forms an angle with the irradiation direction of the laser light.

[0034] Effects of the Invention

[0035] The non-contact automatic measurement method and device for golf clubs of the present invention have the following advantages: even an unskilled operator can measure the specifications of a golf club, and the specifications of a golf club can be measured quickly and accurately using a simple device. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] [ Figure 1 ] Figure 1 1 is an explanatory diagram schematically showing the measurement principle of a non-contact automatic golf club measuring device 1 according to the first embodiment of the present invention.

[0037] [ Figure 2 ] Figure 2 This is an explanatory diagram explaining the principle of determining the position of the shaft centerline based on the outer shape of the shaft, which is a circle. Figure 2 (a) is an example of a photograph taken with slit light from the shaft. Figure 2 (b) is a diagram showing the shaft center calculated from a photograph of the shaft. Figure 2 (c) is an example of an actual photograph showing an example of photographing the shaft at regular intervals.

[0038] [ Figure 3 ] Figure 3 is an explanatory diagram showing a cross section of a linear groove when slit light is irradiated onto the linear groove. Figure 3 (a) is an enlarged cross-sectional view. Figure 3 (b) is a cross-sectional view illustrating the position of the groove.

[0039] [ Figure 4 ] Figure 4 It is a diagram that measures the grooves to determine their positions by measuring the hitting surface. Figure 4 (a) is a diagram showing the measurement position (black dot) on the hitting surface. Figure 4 (b) is an explanatory diagram based on the long groove.

[0040] [ Figure 5 ] Figure 5 is an explanatory diagram showing a method for calculating a hitting surface serving as a reference. Figure 5 (a) is a diagram illustrating the division method of measurement data used as a benchmark. Figure 5 (b) is a diagram illustrating a reference hitting surface.

[0041] [ Figure 6 ] Figure 6 This is an explanatory diagram explaining the measurement principle of FP.

[0042] [ Figure 7 ] Figure 7 This is a block diagram showing an outline of a control system for controlling a non-contact automatic golf club measuring device.

[0043] [ Figure 8 ] Figure 8 This is an illustration of the specifications of the club head. Figure 8 (a) is the front view, Figure 8 (b) is the left side view.

[0044] [ Figure 9 ] Figure 9 1 is an external view showing the external appearance of a non-contact automatic golf club measuring device 50 according to a second embodiment of the present invention. DETAILED DESCRIPTION

[0045] [First embodiment]

[0046] Hereinafter, a non-contact automatic golf club measuring device 1 according to a first embodiment of the present invention will be described with reference to the drawings. Figure 1 This is an explanatory diagram showing an overview of the measurement principle of the non-contact automatic measuring device 1 for golf clubs. Two mounting blocks 3 are fixed at intervals to the measuring device body 2 of the non-contact automatic measuring device 1 for golf clubs, and a V-shaped block 4 is fixed to the mounting block 3. The V-shaped block 4 is a general component, and in this case, it is a steel rectangular table with a V-shaped groove at an angle of 90 degrees. The two V-shaped blocks 4 are arranged so that the V-shaped grooves are straight and in the same plane with each other, and are fixed. The shaft 6 of a cylindrical golf club 5 is placed on the two V-shaped blocks 4, and the shaft 6 is positioned and supported by the V-shaped groove. Since the shaft 6 is placed in the V-shaped groove, the center line 7 of the shaft does not move and is always positioned at a specified position in the width direction of the V-shaped groove.

[0047] Furthermore, since the V-shaped block 4 is mounted via the mounting block 3 fixed to the measuring device body 2, when the shaft 6 is placed on the V-shaped block 4, it is placed in a substantially horizontal position with a gap D. Furthermore, the shaft 6 is not limited to being cylindrical; if it is tapered, it is not limited to being placed horizontally. Therefore, the term "horizontal" in the present invention also encompasses a substantially horizontal position. The club head 8 at the tip of the shaft 6 is heavier than other parts. Therefore, due to its own weight, it swings about the shaft centerline 7, always positioned below the position where the shaft 6 is placed. The striking face 9 of the club head 8 is maintained at a predetermined angle in a stable state, without movement or swinging. As a result, diffuse reflection of the laser light, or slit light 26, incident on the club head 8 is less likely to occur, thereby preventing diffuse reflection that could interfere with measurement.

[0048] In the measuring device main body 2, a rail 15 is fixedly positioned above the two V-shaped blocks 4, parallel to the shaft centerline 7. A box-shaped moving stage 16 is movably mounted on the rail 15 via linear bearings (not shown). A servo motor 20 is positioned at the end of the rail 15. A feed screw 21, a ball screw, is coupled to the output shaft of the servo motor 20. The feed screw 21 converts rotational motion into linear motion, thereby driving the moving stage 16. A ball nut 22, threadedly engaged with the feed screw 21, is fixedly positioned on the moving stage 16. Therefore, when the servo motor 20 is activated to rotate its main shaft, the moving stage 16 moves along the rail 15 (in the x-axis direction). A laser light irradiator 25, which irradiates laser light, is positioned on the moving stage 16. This laser light irradiator 25 outputs a linear laser beam, called a slit beam 26, for measurement, in the y-axis direction. The slit light 26 is irradiated from above the shaft 6 in a direction substantially perpendicular to the shaft centerline 7. Furthermore, the substantially perpendicular direction may not be a strictly 90-degree angle, as it can be modified by calculation. Therefore, the term "substantially perpendicular" in the present invention encompasses angles before and after the perpendicular direction.

[0049] The slit light 26 is irradiated from the upper portion of the cylindrical shaft 6 at right angles to the shaft centerline 7, resulting in a linear semicircular shape appearing on the surface of the shaft 6. A digital camera 27 is mounted on the moving stage 16 to capture this semicircular shape. The optical axis, or centerline 28, of the lens of the digital camera 27 is positioned at an angle θ (acute angle) with the slit light 26. The centerline of the slit light 26 of the laser irradiator 25 and the centerline 28 of the lens of the digital camera 27 move along the shaft centerline 7. This movement is achieved by activating and rotating the servo motor 20, thereby moving the laser irradiator 25 and the digital camera 27 mounted on the moving stage 16 along the shaft centerline 7. The slit light 26 emitted from the laser irradiator 25 irradiates the shaft 6, and appears as a linear semicircular shape on the surface of the shaft 6. The semicircular irradiation light is photographed by the digital camera 27 and is photographed from a direction forming an angle θ with the slit light 26, so that its shape is captured as a semi-ellipse (more precisely, an arc of an ellipse) (refer to Figure 2 (a) The position of the shaft center line 7 is obtained by calculation based on the semi-ellipse using a calculation method described later.

[0050] [Specifications of golf club head 8]

[0051] Figure 8 This is an illustration of the specifications of the club head. Figure 8 (a) is the front view, Figure 8(b) is a left side view. The sole angle β is the angle formed by the shaft centerline 7 and the grooves 11. The angle formed by the roughly flat surface of the club head 8, that is, the hitting surface 9, and the surface including the shaft centerline 7 (also a surface parallel to the grooves 11) is the loft angle α. The entire surface of the hitting surface 9 formed with the grooves 11 is not limited to a flat surface. Therefore, the hitting surface 9 mentioned in this embodiment is a surface calculated by measurement using the method described later. Figure 8 As shown, face offset (FP) refers to the distance between a plane including the shaft centerline 7 (also a plane parallel to the grooves 11) and a plane parallel to the plane including the frontmost side of the leading edge 14 (the frontmost side of the striking face 9).

[0052] [Measurement of the shaft centerline 7]

[0053] Hereinafter, the outline of the principle of shape measurement, image processing, and calculation processing by the non-contact automatic measuring device for golf clubs 1 will be described. Figure 2 (a) to (c) are explanatory diagrams explaining the principle of determining the position of the shaft center line 7 based on the circular shape of the shaft 6. Figure 2 (a) is an example of a photograph taken with slit light from the shaft. Figure 2 (b) is a diagram showing the shaft centerline calculated from a photograph of the shaft. Figure 2 (c) shows an example of a photograph taken at regular intervals along the shaft axis. Slit light 26 emitted from laser irradiator 25 illuminates the upper portion of cylindrical shaft 6 at right angles to shaft centerline 7, resulting in a theoretical linear semicircular shape. However, the slit light 26 is not visible due to a blind spot in the lower half of cylindrical shaft 6.

[0054] Since the digital camera 27 takes a picture of the object from the angle θ (refer to Figure 1 ), so if Figure 2 As shown in (a), the captured image becomes semi-elliptical. This semi-elliptical arc as two-dimensional data (pixel) is converted into three-dimensional data (x, y, z axis space) (in mm). This data conversion is based on the data of the calibration performed in advance. The so-called calibration means that the three-dimensional position (x, y, z axis space) of the outer diameter of the shaft 6 is geometrically associated with the semi-elliptical arc data as the two-dimensional data of the captured image. A circle is obtained by the least squares method based on the semicircle that has been three-dimensionally converted, and the center of the circle is used as the center 7 of the shaft 6. The above calculation is performed multiple times in the set length direction of the shaft 6 (refer to Figure 2(c)) calculates the center point of the circle. Then, a three-dimensional straight line is obtained from the center point using the least squares method, and this straight line is used as the shaft center line 7. This determines the vector and position of the shaft center line 7, which is the center of the shaft 6 of the golf club 5.

[0055] [Measurement of groove 11]

[0056] The Royal & Ancient Golf Club (R&A) and other organizations have various regulations regarding the grooves 11 formed on the striking face 9, which they call "groove specifications." These regulations require that the cross-sectional shape of the groove edge be substantially circular, and their effective radius dimensions are also specified. Figure 3 This is an explanatory diagram of irradiating a linear groove with slit light, and is a cross-sectional view of the linear groove. Figure 3 (a) is an enlarged cross-sectional view. Figure 3 (b) is a cross-sectional view illustrating the position of the groove. Figure 3 As shown in (a), slit light 26 is continuously irradiated onto the grooves 11 of the hitting face 9 placed at an angle γ with the slit light 26. At this time, each measurement point, that is, each position (three-dimensional spatial position) is determined based on the reflected light of the slit light 26.

[0057] like Figure 3 As shown in (a), the measurement point (black dot in the figure) of the hitting surface 9 at this time is close to the previous measurement point and is therefore continuously determined. However, the side wall 12 of the groove 11 becomes a blind spot, and the light is not reflected from the side wall 12 but from the groove bottom 13. That is, while the slit light 26 is directed in the x-axis direction ( Figure 3 ) while moving and irradiating, and measuring the reflected light at regular intervals. When the slit light 26 is located at the position of the linear groove 11, the slit light 26 is not reflected by the side wall 12 but by the groove bottom 13. At this time, the measured value is also a step difference in the y-axis direction (y-axis direction). Therefore, the measurement position (black dot in the figure) is determined to be the position of the groove bottom 13 of the linear groove 11 ( Figure 3 (b)). The measurement is performed across the entire surface of the striking surface 9. The measurement position is determined to be the step position of the groove 11 based on its size (in the y-axis direction). This size is set based on the design dimensions and tolerances, and is determined by differential values, thresholds, and actual product measurement data.

[0058] According to the detection method of the groove 11, Figure 4 This is a diagram that measures the hitting surface and determines the groove positions. Figure 4 (a) is a diagram showing the determined position (black dot) on the hitting surface. Figure 4 (b) is an explanatory diagram based on the long groove. Figure 4Each point (black point) in (a) is a groove 11 determined by the algorithm. The groove 11 is formed as a plurality of parallel grooves, such as Figure 4 The points in (a) are detected as depicted. A straight line is found using the least squares method based on each of the measurement points (black dots), and this straight line is defined as groove 11. Only the longest straight line is used as groove 11. Since the lengths of the measured grooves 11 are not always the same as the designed values, the slope of groove 11 is determined by averaging the vectors of multiple grooves 11. Furthermore, the coordinates (x, y, and z axis positions) of the ends of the longest straight line calculated within groove 11 are defined as the ends of groove 11.

[0059] [Calculation of loft angle α]

[0060] As shown in the figure, the center position of the groove 11 in the longitudinal direction after the averaging is obtained, and the hitting surface 9 is divided into two dividing surfaces 30 with the center position as the center, which are planes perpendicular to the groove 11 and separated by a certain width (see Figure 5 (a)). In other words, the grooves 11 can also be called the surface normals of the partition surface 30. Then, the strip-shaped reference hitting surface 31 is determined by the method described below (see Figure 5 (b) From the strip-shaped striking surface 9 divided by the two dividing planes 30, only the point clusters whose shape change, as determined by differential values, is less than a predetermined threshold are extracted. This eliminates the upper and lower curved surfaces of the striking surface 9, the unevenness within the grooves 11, and the like. Based on this extracted point cluster, a plane is calculated using the least squares method and used as the reference striking surface 31. Once the reference striking surface 31 is determined, the loft angle α with respect to the shaft centerline 12 can be calculated, thereby enabling determination.

[0061] [Measurement of face deviation (FP)]

[0062] like Figure 8 As described in (b), the face offset (FP) is a numerical value (interval) indicating how much the leading edge 14 of the club head 8 deviates from the shaft centerline 7 . Figure 6 This is an explanatory diagram explaining the principle of FP measurement. A shaft centerline plane 32 including the shaft centerline 7 is defined as a plane parallel to the groove 11. Based on the shaft centerline plane 32, the normal distances of each measuring point 33 of the leading edge 14 are calculated. The measuring point with the longest normal distance among the measuring points 33 is defined as the FP point, and its normal distance is defined as the face deviation (FP) (refer to Figure 8 ).

[0063] [Control device 40 for non-contact automatic golf club measuring device]

[0064] Figure 7This is a block diagram schematically illustrating the control system 40 used to control the non-contact automatic golf club measuring device 1. The control device 41 of the control system 40 is a known sequence control unit that includes a central processing unit (CPU), random access memory (RAM), read-only memory (ROM), auxiliary storage, a display unit, input units, and various output units. A position signal is transmitted from a position detection sensor 43 to the control device 41 via an interface (I / F) 42. The position detection sensor 43 detects the position of the movable stage 16 in the x-axis direction. Specifically, it is a rotary encoder that detects the rotation of the servo motor 20. Furthermore, the servo motor 20, the laser irradiator 25, and the digital camera 27 are connected to the control device 41 via the interface (I / F) 42, and these devices are controlled to turn on and off. The control device 41 performs the image processing and calculations described above using software stored in the CPU (Central Processing Unit), RAM, ROM, auxiliary storage, and other devices. The specific processing is known technology and will not be described here.

[0065] [Second embodiment]

[0066] In the non-contact automatic golf club measuring device 1 of the first embodiment, the laser irradiator 25 and the digital camera 27 are mounted on the movable stage 16 and are moved on the guide rail 15 by screw drive. However, a method may also be employed in which the laser irradiator 25 and the digital camera 27 are fixed and the golf club 5 is moved. Figure 9 This is an external view of a non-contact automatic golf club measuring device 50 according to a second embodiment of the present invention. This non-contact automatic golf club measuring device 50 is an example of a structure that moves a golf club 5. The measuring device body 51, serving as a housing, is a rectangular, box-shaped member with a hollow interior and an open front. This prevents interference from external light, dust, and the like during measurement, and allows easy loading and unloading of the golf club 5 from the front. An automatic stage mechanism 52, which serves as a unit for moving the golf club 5, is located on the bottom plate of the measuring device body 51. This unitized automatic stage mechanism 52, including its movement control device, is well known and commercially available. A rail (not shown) is fixed to the table 53. A movable table 56 is movably mounted on the rail via linear bearings (not shown).

[0067] Two V-shaped blocks 55 are mounted and fixed on the movable stage 56. A servo motor 54 is located at the end of the track. A feed screw (not shown) is connected to the output shaft of the servo motor 54. The feed screw converts rotational motion into linear motion to drive the movable stage 56. A ball nut (not shown) is fixed to the movable stage 56 and engages with the feed screw. Therefore, when the servo motor 54 is activated and its main shaft rotates, the movable stage 56 moves along the track (in the x-axis direction). A laser irradiator 58, which emits laser light, and a digital camera 59 are fixed to the measuring device main body 51 above the automatic stage mechanism 52. The laser irradiator 58 and digital camera 59 have the same structure and function as the laser irradiator 25 and digital camera 27 in the first embodiment, and their description will be omitted. A control device 57 is located in the measuring device main body 51 to control the automatic stage mechanism 52, the laser irradiator 58, and the digital camera 59. The non-contact automatic golf club measuring device 50 of the second embodiment can be used to measure golf clubs 5 having long shafts. Furthermore, while a single feed screw is used to transport the movable table 56, a two-stage movable table structure can also be employed, with another movable table mounted on the movable table 56 and a feed screw provided on the other movable table.

[0068] [Other embodiments]

[0069] The groove 11, or more precisely, the reference hitting surface 31 is determined by the position of the groove bottom 13. As another determination method, Figure 3 As shown in (a), the position of one corner 11b of the groove 11 can also be determined as a groove. According to the above determination, since the detection is performed in pairs with the other corner 11a sandwiched between the groove bottom 13, there is an advantage in that the detection can be performed accurately. That is, the differential value of the corner 11a in the Y-axis direction and the differential value of the corner 11b on the side wall 12 can be used to determine the position of the groove 11 by the measurement value, so it has the advantage of accuracy. The reference hitting surface 31 is strip-shaped, but it can also include a hitting sweet spot 34 (see Figure 5 Method (b) uses a circular base hitting surface 31. As mentioned above, lie angle β is the angle between the shaft centerline 7 and the contact surface when the grooves 11 are placed parallel to the contact surface and the plane including the shaft centerline 7 is positioned perpendicularly. Therefore, since the positions of the shaft centerline 7 and grooves 11 can be measured, lie angle β can also be measured.

[0070] The shooting direction of the digital camera 27 forms an angle θ with the irradiation direction of the slit light 26. The angle θ can be any angle as long as it does not produce diffuse reflection. Similarly, the slit light 26 irradiated by the laser light irradiator 25 is irradiated from a direction perpendicular to the center line 7 of the shaft. It is not limited to the perpendicular direction, and the irradiation direction can be any angle as long as it does not produce diffuse reflection. In addition, the non-contact automatic measuring device 1 for golf clubs is mainly described assuming the measurement in the production process of golf clubs, but the measuring device for golf clubs in use or on sale can also be used in golf courses, golf driving ranges, golf equipment stores, etc.

[0071] Explanation of Figure Numbers

[0072] 1.50: Non-contact automatic measuring device for golf clubs

[0073] 2.51: Measuring device body

[0074] 3: Install the block

[0075] 4.55: V-shaped block

[0076] 5. Golf clubs

[0077] 6: Shaft

[0078] 7: Shaft centerline

[0079] 8: Club Head

[0080] 9: Hitting surface

[0081] 11: Groove (face line)

[0082] 12: Sidewall

[0083] 13: Bottom of the groove

[0084] 14: Leading Edge

[0085] 15: Track

[0086] 16, 56: Mobile station

[0087] 20, 54: Servo motor

[0088] 21: Feed screw

[0089] 22: Ball nut

[0090] 25, 58: Laser light irradiator

[0091] 26: Slit Light

[0092] 27, 59: Digital camera

[0093] 30: Divide the surface

[0094] 31: Base hitting surface

[0095] 32: Shaft centerline plane

[0096] 33: Measurement point (leading edge)

[0097] 34: Sweet Spot

[0098] 52: Automatic stage mechanism

[0099] θ: The angle between the slit light and the center line of the optical axis of the digital camera

[0100] α: Loft angle

[0101] β: Lie angle

[0102] γ: The angle between the slit light and the hitting surface

Claims

1. A non-contact automatic measurement method for golf clubs, characterized in that: In having A laser light irradiator for irradiating a golf club with laser light as slit light, and A digital camera that captures the reflected light of the irradiated laser light as an image In the golf club non-contact automatic measuring device, the following steps are performed: a shaft holding step of placing and holding the golf club shaft; a shaft image taking step of taking in a shaft image based on the outer shape of the shaft; a shaft centerline calculation step of obtaining a shaft centerline of the shaft based on the shaft image; a club head image taking step of taking in a club head image of the golf club head; a groove calculation step of obtaining the grooves of the golf club based on the club head image; a reference hitting surface calculation step of obtaining a reference hitting surface based on the club head image; as well as At least one selected from a lie angle, a loft angle, and a face offset is determined based on the shaft center line, the grooves, and the reference hitting surface.

2. The non-contact automatic measurement method for golf clubs according to claim 1, characterized in that: In the shaft image capturing step and the head image capturing step, the laser light irradiator and the digital camera or the golf club are moved in the shaft centerline direction to irradiate the slit light.

3. The non-contact automatic measurement method for golf clubs according to claim 2, characterized in that: The irradiation direction of the laser light is a direction at right angles to the center line of the shaft. The photographing direction of the digital camera forms an angle with the irradiation direction of the laser light.

4. A non-contact automatic measuring device for golf clubs, comprising: a laser light irradiator for irradiating the golf club with laser light as slit light; a digital camera that captures the reflected light of the laser light subjected to the irradiation as an image; a plurality of positioning blocks for placing and holding the shaft of the golf club in a horizontal direction; and The relative moving means relatively moves the laser light irradiator and the digital camera along the center line of the shaft which is the center of the shaft placed on the positioning block.

5. The non-contact automatic measuring device for golf clubs according to claim 4, characterized in that: The relative moving member mounts the laser light irradiation device and the digital camera, or the golf club on a moving stage, and moves the laser light irradiation device and the digital camera, or the golf club, on a guide rail through screw drive.

6. The non-contact automatic measuring device for golf clubs according to claim 6, characterized in that: The laser light irradiator is set at an angle position so as to irradiate from a direction perpendicular to the center line of the shaft. The digital camera has a photographing direction that forms an angle with the irradiation direction of the laser light.

Images