Golf ball screening device

Abstract

The present invention relates to a golf ball screening device, and the golf ball screening device of the present invention is characterized by comprising: a measuring unit for transmitting a signal to a golf ball and receiving a signal reflected from or transmitted through the golf ball; and an analyzing unit for analyzing the received signal and screening the golf ball.

Description

TECHNICAL FIELD

[0001] The present invention relates to a golf ball screening device, and more particularly, to a golf ball screening device that screens a golf ball composed of a core, an inner cover, and an outer cover to select a golf ball having a uniform and nearly symmetrical mass. BACKGROUND

[0002] A golf ball is composed of a core and a shell, and is classified into two, three, and four layers according to the layer structure of the golf ball. Recently, with the development of manufacturing technology, not only professional players in a tour, but also amateur golfers mainly use a three-layer golf ball composed of a core, an inner cover, and an outer cover or a four-layer golf ball composed of a double core, an inner cover, and an outer cover.

[0003] Such a golf ball is produced at about 4,000,000 dozens per year, and problems such as core misalignment (2.78%), internal medium imbalance (11.11%), or outer cover damage (2.78%) frequently occur in the production process, which hinders consistent hitting.

[0004] Defects caused by outer cover damage can be detected by direct vision or touch of a person or by image analysis after photographing an image. However, as for a method for confirming defects caused by core misalignment or internal medium imbalance, there has been a method of floating a golf ball in a liquid in which salt water and a surfactant are mixed, but the screening time is long, and thus the method is not suitable for application to a production process. Therefore, there is no suitable method for detecting such internal medium imbalance of a golf ball. SUMMARY

[0005] TECHNICAL PROBLEM

[0006] The present invention has been made to solve the conventional problems, and an object of the present invention is to provide a golf ball screening device that transmits an electromagnetic wave signal to a golf ball and receives and analyzes an electromagnetic wave signal transmitted through the golf ball or reflected from the golf ball, thereby screening a golf ball having a uniform and nearly symmetrical mass.

[0007] The problems to be solved by the present invention are not limited to the above-mentioned problems, and those skilled in the art will clearly understand the problems from the following description.

[0008] MEANS FOR SOLVING THE PROBLEM

[0009] The object can be achieved by a golf ball screening device of the present application, which is characterized by comprising: a measuring unit for transmitting a signal to a golf ball and receiving a signal reflected from the golf ball or a signal transmitted through the golf ball; and an analyzing unit for analyzing the received signal and screening a golf ball.

[0010] Here, the measuring unit can include a rotation support unit for rotatably supporting the golf ball, an electromagnetic wave transmitting antenna disposed at one side of the golf ball for transmitting an electromagnetic wave to the golf ball, and an electromagnetic wave receiving antenna disposed at the other side of the golf ball for receiving the electromagnetic wave transmitted from the electromagnetic wave transmitting antenna.

[0011] Here, the measuring unit can include a rotation support unit for rotatably supporting the golf ball, and an electromagnetic wave transmitting / receiving antenna disposed at one side of the golf ball for transmitting an electromagnetic wave to the golf ball and receiving a reflected electromagnetic wave.

[0012] Here, the rotation support unit can include a golf ball support body for vertically separating the golf ball from the ground to support the golf ball, and a rotation mechanism for rotating the golf ball support body about a vertical axis thereof, and the golf ball screening device can include first and second antenna support bodies spaced apart from the golf ball support body for supporting the electromagnetic wave transmitting antenna and the electromagnetic wave receiving antenna on a horizontal plane with the golf ball supported by the golf ball support body, respectively.

[0013] Here, the rotation support unit can include a golf ball support body for vertically separating the golf ball from the ground to support the golf ball, and a rotation mechanism for rotating the golf ball support body about a vertical axis thereof, and the golf ball screening device can include an antenna support body spaced apart from the golf ball support body for supporting the electromagnetic wave transmitting / receiving antenna on a horizontal plane with the golf ball supported by the golf ball support body.

[0014] Here, a base can be further included for supporting the golf ball support body and the antenna support body on one surface, and the base can include an absorber attached or coated on the one surface for absorbing scattered electromagnetic waves.

[0015] Here, the antenna support body can adjust a distance of separation from the golf ball support body by sliding.

[0016] Here, the rotation support unit can include a first rotation support plate for supporting a first position of the golf ball with a side surface and rotating by a motor, and a second rotation support plate for supporting a second position of the golf ball with a side surface and rotating by a motor.

[0017] Here, the first position and the second position are preferably two positions orthogonal with respect to the center of the golf ball.

[0018] Here, the rotation support portion can further include a rotation bar supporting a third position of the golf ball using a bar freely rotating on both sides.

[0019] Here, the signal can be an RF electromagnetic wave signal.

[0020] Here, the signal can be an electromagnetic wave, and the golf ball screening device can further include a detector for generating and transmitting / receiving an electromagnetic wave and outputting and detecting the magnitude and phase of the received electromagnetic wave.

[0021] Here, the detector can be composed of a transmission circuit and a reception circuit, or composed of a network analyzer, or composed of a signal generator and a spectrum analyzer.

[0022] Here, the analysis portion can screen a golf ball having a uniform interior and close to symmetry based on the uniformity of the signals received by the plurality of measurement surfaces while the golf ball is being rotated.

[0023] Here, the analysis portion can screen a golf ball having a uniform interior and close to symmetry based on the uniformity of the magnitude and phase of the signals received by the plurality of measurement surfaces.

[0024] Here, the analysis portion can screen a golf ball having a uniform interior and close to symmetry based on the magnitude and phase of the signals received by the plurality of measurement surfaces based on deep learning.

[0025] Effects of the Invention

[0026] According to the golf ball screening device of the present invention as described above, it is possible to easily and quickly screen a golf ball having a uniform interior and close to symmetry and good quality using an electromagnetic wave signal. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a block diagram briefly explaining the structure of a golf ball screening device according to an embodiment of the present invention.

[0028] Figure 2 is a perspective view and a side view of a golf ball screening device according to an embodiment of the present invention.

[0029] Figure 3 is Figure 2 a modified example of

[0030] Figure 4 is a diagram showing a golf ball screening device according to another embodiment of the present invention.

[0031] Figure 5 is a perspective view that shows in detail the rotation support part of Figure 4 .

[0032] Figure 6 and Figure 7 are diagrams that show modified examples of the detector of Figure 4 .

[0033] Figure 8 is a modified example of Figure 4 .

[0034] Figure 9 and Figure 10 are diagrams that show modified examples of the detector of Figure 8 .

[0035] Figure 11 is a diagram that shows the transmission and reflection signals of a golf ball (a) in which the electromagnetic wave signal is symmetrical inside and outside, a golf ball (b) in which the inner core is eccentric, a golf ball (c) in which the inner core is asymmetrically unbalanced, and a golf ball (d) in which the outer shell is damaged.

[0036] Figure 12 is a perspective view of a golf ball for explaining the eccentricity of the golf ball.

[0037] Figure 13 and Figure 14 are graphs that show the results of measuring the electromagnetic wave transmission characteristics using the golf ball screening device according to the present invention.

[0038] Figure 15 is a graph that shows the results of wood shot at a swing speed of 115 mph with respect to the balls screened in (a) of Figure 14 and the balls screened in (b).

[0039] Figure 16 is a graph that shows the results of wood shot at a swing speed of 95 mph with respect to the balls screened in (a) of Figure 14 and the balls screened in (b).

[0040] Figure 17 is a graph that shows the results of 7-iron shot at a swing speed of 85 mph with respect to the balls screened in (a) of Figure 14 and the balls screened in (b).

[0041] Figure 18 is a graph that shows the results of pitching shot at a swing speed of 75 mph with respect to the balls screened in (a) of Figure 14 and the balls screened in (b). DETAILED DESCRIPTION

[0042] The detailed contents of the embodiments are included in the detailed description and the accompanying drawings.

[0043] Advantages and features of the present application and methods for accomplishing the same can be understood more readily by reference to the following detailed description of embodiments and the accompanying drawings. The present application may, however, be embodied in various different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art. Like reference numerals refer to like elements throughout the specification.

[0044] Hereinafter, the present application will be described by embodiments thereof, and with reference to the accompanying drawings for explaining a golf ball screening device.

[0045] Figure 1 is a block diagram briefly explaining the configuration of a golf ball screening device according to an embodiment of the present application.

[0046] The golf ball screening device according to an embodiment of the present application can be configured to include a measurement part 100 and an analysis part 200.

[0047] The measurement part 100 can transmit a signal to a golf ball as an object to be measured, and receive a signal reflected from the golf ball or a signal transmitted through the golf ball. At this time, the signal can be transmitted and received to and from a plurality of measurement surfaces of the golf ball. Herein, the measurement surface can be a surface perpendicular to the direction of the transmitted signal. The signal can be an electromagnetic wave, and as an example, can be an RF (Radio Frequency) electromagnetic wave signal, but is not limited thereto.

[0048] In the measurement part 100, in order to confirm the response of the electromagnetic wave reflected or transmitted to the plurality of measurement surfaces of the golf ball as the object to be measured, a first electromagnetic wave reflected or transmitted after the golf ball as the object to be measured is rotated by any angle is received, and a second electromagnetic wave reflected or transmitted after the golf ball as the object to be measured is further rotated by any angle is received. In this way, by rotating the golf ball and transmitting and receiving the electromagnetic wave, the measurement can be repeatedly performed to the plurality of measurement surfaces.

[0049] At this time, the measurement part 100 can be configured to include a rotation support part capable of rotatably supporting the golf ball as the object to be measured, an electromagnetic wave transmitting antenna 110 disposed at one side of the golf ball and for transmitting the electromagnetic wave to the golf ball, and an electromagnetic wave receiving antenna 120 disposed at the other side of the golf ball and for receiving the electromagnetic wave transmitted from the electromagnetic wave transmitting antenna. That is, the electromagnetic wave signal transmitted from the electromagnetic wave transmitting antenna 110 at one side of the golf ball can be received by the electromagnetic wave receiving antenna 120 at the other side of the golf ball, thereby receiving the electromagnetic wave signal transmitted through the golf ball.

[0050] Alternatively, the measurement unit 100 can be configured to include a rotation support unit capable of rotatably supporting the golf ball to be measured, and an electromagnetic wave transceiving antenna 1120 disposed at one side of the golf ball and configured to transmit electromagnetic waves to the golf ball and receive electromagnetic waves reflected from the golf ball. That is, the electromagnetic wave transceiving antenna 1120 disposed at one side of the golf ball transceives the electromagnetic wave signals reflected from the golf ball.

[0051] The detailed structure of the measurement unit 100 will be described later.

[0052] The analysis unit 200 analyzes the signals received from the plurality of measurement surfaces while the golf ball is being rotated to screen the golf ball. For example, when the golf ball is a ball having a uniform shape of an inner core and the structure of the inner core, the inner skin, and the outer skin is left-right symmetrical, the uniformity of the signals received while the golf ball is being rotated should be high. That is, the similarity of the magnitude and phase of the electromagnetic waves reflected or transmitted by the plurality of measurement surfaces should be high. It can be inferred that the greater the difference in the magnitude and phase of the electromagnetic waves reflected or transmitted by each measurement surface, the greater the non-uniformity inside the golf ball. Accordingly, in the present disclosure, the analysis unit 200 screens the golf ball having a uniform internal medium and close to symmetry based on the uniformity of the signals received while the golf ball is being rotated by the rotation support unit.

[0053] The analysis unit 200 can be configured by software installed on a computer including a computing device and a storage device, or a smart device such as a smart phone.

[0054] In an embodiment, the analysis unit 200 can use a deep learning technique to infer the eccentricity or non-uniformity of the internal medium of the golf ball. The analysis unit 200 can use a deep learning technique to classify the level of eccentricity or non-uniformity of the golf ball, or determine defects according to a predetermined standard.

[0055] Figure 2 is a perspective view and a side view of a golf ball screening device according to an embodiment of the present disclosure, Figure 3 is Figure 2 a modified example of

[0056] Referring to Figure 2 , the measurement unit 100 of the golf ball screening device according to the present embodiment can be configured to include a rotation support unit and two antennas 110, 120.

[0057] The rotation support part can be configured to include a golf ball support 130 and a rotation mechanism 135. The golf ball support 130 supports the measured object golf ball vertically spaced apart from the ground. As shown in the drawing, the golf ball support 130 can be formed in a bar shape extending from the ground toward the vertical upper side, and the golf ball can be placed on the upper end thereof. The rotation mechanism 135 is used to rotate the golf ball support 130 with the vertical axis thereof as the center. As the golf ball support 130 is rotated by the rotation mechanism 135, the measurement surface of the golf ball with respect to the signal transmitted from the electromagnetic wave transmitting antenna 110 can be changed. At this time, the rotation mechanism 135 can rotate the golf ball at any angle. The rotation mechanism 135 can include a motor for rotating the golf ball support 130.

[0058] Further, Figure 2 The measurement part 100 can further include antenna supports 115, 125. The antenna supports 115, 125 can include a first antenna support 115 and a second antenna support 125, which are spaced apart from the golf ball support 130, for supporting the electromagnetic wave transmitting antenna 110 and the electromagnetic wave receiving antenna 120, respectively, so as to be located on a plane horizontal to the golf ball supported by the golf ball support 130.

[0059] Further, Figure 2 The measurement part 100 can further include a base 160 supporting the golf ball support 130 and the antenna supports 115, 125 on one side thereof. At this time, the antenna supports 115, 125 and the golf ball support 130 on one side of the base 160 are provided with sliding holes (not shown) so that the antenna supports 115, 125 can be slidably coupled in the sliding holes. Accordingly, the spaced apart distance between the antenna supports 115, 125 and the golf ball support 130 can be adjusted.

[0060] The golf ball support 130 and the antenna supports 115, 125 are respectively provided in a manner that they can be vertically extended, so that the vertical distance from the base 160 to the supported object can be adjusted.

[0061] An absorber 162 for absorbing electromagnetic waves can be attached or coated on one side of the base 160. The absorber 162 can be a ferrite, but is not limited thereto. The absorber 162 can absorb electromagnetic waves transmitted from the electromagnetic wave transmitting antenna 110 and scattered by the golf ball support 130 or the antenna supports 115, 125, thereby preventing the electromagnetic wave receiving antenna 120 from receiving noise. As shown in the drawing, the absorber 162 can also be attached or coated on the antenna supports 115, 125.

[0062] The electromagnetic wave transmitting antenna 110 and the electromagnetic wave receiving antenna 120 can be connected to the detector 140. The detector 140 is used to generate electromagnetic waves and transmits and receives electromagnetic waves through the electromagnetic wave transmitting antenna 110 and the electromagnetic wave receiving antenna 120, and outputs and detects the magnitude and phase of the received electromagnetic waves.

[0063] In the present application, the detector 140 can be formed in various forms. The detector 140 can be composed of a transmitting circuit 1413 and a receiving circuit 1414, or a network analyzer 1420, or a signal generator 1430 and a spectrum analyzer 1432, but is not limited thereto.

[0064] When the detector 140 is the network analyzer 1420, the electromagnetic wave transmitting antenna 110 and the electromagnetic wave receiving antenna 120 are connected to the electromagnetic wave transmitting side and the electromagnetic wave receiving side of the network analyzer 1420. When the detector 140 is composed of the signal generator 1430 and the spectrum analyzer 1432, the electromagnetic wave transmitting antenna 110 is connected to the signal generator 1430, and the electromagnetic wave receiving antenna 120 is connected to the spectrum analyzer 1432.

[0065] The detector 140 is connected to the analysis unit 200, so that the magnitude and phase of the detected electromagnetic waves can be transmitted.

[0066] Figure 3 Variations of the measurement unit 100 shown in FIG. 1 are shown in FIGS. 2 to 5. In the following description, the differences from the foregoing embodiment are described. Figure 2 Referring to FIG. 2, the measurement unit 100 is configured to have an electromagnetic wave transmitting antenna 110 and an electromagnetic wave receiving antenna 120.

[0067] Figure 3 The detector 140 is connected to the analysis unit 200, so that the magnitude and phase of the detected electromagnetic waves can be transmitted.

[0068] The structure of the rotation support unit composed of the golf ball support 130 and the rotation mechanism 135 is the same as the foregoing structure.

[0069] The antenna support 1125 is used to support the electromagnetic wave transmitting and receiving antenna 1120. The antenna support 1125 is spaced apart from the golf ball support 130, and is used to support the electromagnetic wave transmitting and receiving antenna 1120 on a plane that is horizontal to the golf ball supported by the golf ball support 130.

[0070] As in the embodiment of FIG. 1, the antenna support 1125 is slidably disposed between the golf ball support 130, so that the distance from the golf ball support 130 can be adjusted. Figure 2 As in the embodiment of FIG. 1, the antenna support 1125 is slidably disposed between the golf ball support 130, so that the distance from the golf ball support 130 can be adjusted.

[0071] Figure 2 ​​In comparison, the electromagnetic wave transceiving antenna 1120 is connected to the detector 140, and can receive only the electromagnetic wave reflected from the plurality of measurement surfaces of the golf ball to be measured.

[0072] The detector 140 is connected to the electromagnetic wave transceiving antenna 1120, and is configured to transceive electromagnetic waves, detect the magnitude and phase of the received electromagnetic waves, and transmit the detection results to the analysis unit 200.

[0073] Figure 4 FIG. 2 is a diagram illustrating a golf ball screening device according to another embodiment of the present application, Figure 5 FIG. 3 is a perspective view illustrating a rotating support unit of Figure 4 FIG. 4 is a perspective view illustrating a rotating support unit of Figure 6 FIG. 5 is a diagram illustrating a variation of the detector of Figure 7 FIG. 6 is a diagram illustrating a variation of the detector of Figure 4 FIG. 7 is a diagram illustrating a variation of the detector of Figure 8 FIG. 8 is a diagram illustrating a variation of the detector of Figure 4 FIG. 9 is a diagram illustrating a variation of the detector of Figure 9 FIG. 10 is a diagram illustrating a variation of the detector of Figure 10 FIG. 11 is a diagram illustrating a variation of the detector of Figure 8 FIG. 12 is a diagram illustrating a variation of the detector of

[0074] In the present embodiment, the measurement unit 100 can be configured with the rotating support unit, the electromagnetic wave transmitting antenna 110, and the electromagnetic wave receiving antenna 120.

[0075] Figure 5 The rotating support unit is configured to support the golf ball and rotate the golf ball to change the posture of the golf ball. The rotating support unit can be configured to include a first rotating support plate 170, a first motor 171 for rotating the first rotating support plate 170, a second rotating support plate 172, and a second motor 173 for rotating the second rotating support plate 172. In addition, the rotating support unit can further include a rotating rod 174.

[0076] As shown in the drawing, the first rotating support plate 170 and the first motor 171 can be supported and fixed in the frame 180 of a hexahedral structure. The first rotating support plate 170 is a circular plate or a cylindrical shape and is configured to have an axis parallel to the ground. As shown in the drawing, the first rotating support plate 170 can serve as a first position of the lateral surface of the golf ball using the lateral surface support. The motor shaft of the first motor 171 is connected to the center axis of the first rotating support plate 170, and the first rotating support plate 170 can be rotated by the driving of the first motor 171. Accordingly, the golf ball supported at the first position can be rotated by the rotation of the first rotating support plate 170 to change the posture of the golf ball.

[0077] The second rotating support plate 172 and the second motor 173 have the same shape as the first rotating support plate 170 and the first motor 171, and can support the second position as the lateral side of the golf ball. In this case, it is preferable that the first rotating support plate 170 and the second rotating support plate 172 are configured to support the left and right centers of the golf ball respectively in mutually orthogonal directions, so that the first position and the second position supporting the golf ball become two positions orthogonal to the center of the golf ball.

[0078] The golf ball can be rotated in two orthogonal directions by rotating the first rotating support plate 170 via the first motor 171 or by rotating the second rotating support plate 172 via the second motor 173. Therefore, the golf ball's posture can be changed into various forms, allowing the entire surface area of ​​the golf ball to be positioned facing the fixedly configured electromagnetic wave transmitting antenna 110 or electromagnetic wave receiving antenna 120.

[0079] The rotating shaft 174 is a shaft that rotates freely on both sides, with its central outer surface supporting the golf ball in a third position. As shown in the figure, when viewed from above, with the center of the golf ball as the center, the third position is preferably located in the center opposite to the first and second positions. When viewed from the side, the third position preferably supports the lower side of the golf ball. To support the rotating shaft 174, a pair of fixed shafts 175 extend inward from the frame 180, and the two ends of the rotating shaft 174 are respectively rotatably fixed to the two ends of the fixed shafts 175.

[0080] Therefore, the lower part of the golf ball is supported at three positions by the first rotating support plate 170, the second rotating support plate 172 and the rotating rod 174. When the first rotating support plate 170 or the second rotating support plate 172 rotates under the drive of the motor, the rotating rod 174 rotates freely, thereby stably supporting the golf ball while making it rotate.

[0081] An electromagnetic wave transmitting antenna 110 can be configured on one side of a golf ball for transmitting signals to the golf ball. A fixing slot 182 can be formed on the upper surface of the frame 180 to facilitate easy fixing of the electromagnetic wave transmitting antenna 110.

[0082] The electromagnetic wave receiving antenna 120 can be configured on the other side of the golf ball to receive signals transmitted from the electromagnetic wave transmitting antenna 110 to and through the golf ball.

[0083] like Figure 4 As shown, an MCU (Micro Controller Unit) 1411, a motor control unit 1412 for controlling the drive of the first motor 171 or the second motor 173, and a detector 140 can be formed on the control board 190, which is a specified circuit board.

[0084] The detector 140 can include a transmission circuit 1413 for generating a signal to be transmitted from the electromagnetic wave transmission antenna 110 and transmitting it to the electromagnetic wave transmission antenna 110, and a reception circuit 1414 for receiving a signal received from the electromagnetic wave reception antenna 120 and processing information related to the size and phase of the signal. The communication section 1415 can transmit the signal processed by the reception circuit 1414 to the analysis section 200 constituted by a terminal such as a smartphone and a smart tablet or a PC as an external device. The communication section 1415 can transmit data by wired or wireless means, and in the present embodiment, a structure for transmitting the signal processed in the reception circuit 1414 to a terminal such as a smartphone using a BLE signal is shown. The received signal can be analyzed and the uniformity characteristics of the golf ball can be judged in the analysis section 200 receiving the signal, and the screening result can be displayed on the display screen. Figure 4 The detector 140 of the present embodiment, in which the network analyzer 1420 performs the functions of the aforementioned transceiver circuit, generates a signal to be transmitted from the electromagnetic wave transmission antenna 110 and transmits it to the electromagnetic wave transmission antenna 110, and receives a signal received from the electromagnetic wave reception antenna 120 and processes it. At this time, information related to the size and phase of the signal processed in the network analyzer 1420 can be transmitted in real time to the analysis section 200, which in the present embodiment is shown as being constituted by a PC. The operation of the motor control section 1412 for driving the first motor 171 or the second motor 173 can be controlled by a control command of the PC.

[0085] Figure 6 The detector 140 of the present embodiment, in which the network analyzer 1420 performs the functions of the aforementioned transceiver circuit, generates a signal to be transmitted from the electromagnetic wave transmission antenna 110 and transmits it to the electromagnetic wave transmission antenna 110, and receives a signal received from the electromagnetic wave reception antenna 120 and processes it. At this time, information related to the size and phase of the signal processed in the network analyzer 1420 can be transmitted in real time to the analysis section 200, which in the present embodiment is shown as being constituted by a PC. The operation of the motor control section 1412 for driving the first motor 171 or the second motor 173 can be controlled by a control command of the PC. Figure 4 Another modification of the detector shown in FIG. 13, in the present embodiment, the functions of the transceiver circuit are performed by a signal generator 1430 for generating a signal to be transmitted from the electromagnetic wave transmission antenna 110 and transmitting it to the electromagnetic wave transmission antenna 110, and a spectrum analyzer 1432 for receiving a signal received from the electromagnetic wave reception antenna 120 and processing it. At this time, information related to the size and phase of the signal processed in the spectrum analyzer 1432 can be transmitted in real time to the analysis section 200, which in the present embodiment is also shown as being constituted by a PC.

[0086] Figure 7 The detector 140 of the present embodiment, in which the network analyzer 1420 performs the functions of the aforementioned transceiver circuit, generates a signal to be transmitted from the electromagnetic wave transmission antenna 110 and transmits it to the electromagnetic wave transmission antenna 110, and receives a signal received from the electromagnetic wave reception antenna 120 and processes it. At this time, information related to the size and phase of the signal processed in the network analyzer 1420 can be transmitted in real time to the analysis section 200, which in the present embodiment is shown as being constituted by a PC. The operation of the motor control section 1412 for driving the first motor 171 or the second motor 173 can be controlled by a control command of the PC. Figure 4 Another modification of the detector shown in FIG. 13, in the present embodiment, the functions of the transceiver circuit are performed by a signal generator 1430 for generating a signal to be transmitted from the electromagnetic wave transmission antenna 110 and transmitting it to the electromagnetic wave transmission antenna 110, and a spectrum analyzer 1432 for receiving a signal received from the electromagnetic wave reception antenna 120 and processing it. At this time, information related to the size and phase of the signal processed in the spectrum analyzer 1432 can be transmitted in real time to the analysis section 200, which in the present embodiment is also shown as being constituted by a PC.

[0087] In the present embodiment, the operation of the motor control section 1412 for driving the first motor 171 or the second motor 173 can also be controlled by a control command of the PC.

[0088] Figure 8 A modification of the measurement section 100 shown in FIG. 12. In the following explanation, the differences from the aforementioned embodiments are centered. Figure 4 A modification of the measurement section 100 shown in FIG. 12. In the following explanation, the differences from the aforementioned embodiments are centered.

[0089] Referring to Figure 8 In the present embodiment, an electromagnetic wave transceiving antenna 1120 is configured by integrating the electromagnetic wave transmitting antenna 110 and the electromagnetic wave receiving antenna 120.

[0090] The golf ball screening device according to the present embodiment can be configured to include a rotating support portion, the electromagnetic wave transceiving antenna 1120, and the analysis portion 200.

[0091] In the embodiment described above Figure 4 with reference to The electromagnetic wave transmitting antenna 110 is configured on one side of the golf ball, and the electromagnetic wave receiving antenna 120 is configured on the other side of the golf ball, and specifically, the signal transmitted from the electromagnetic wave transmitting antenna 110 and transmitted through the golf ball is received by the electromagnetic wave receiving antenna 120, and the golf ball is screened based on the received signal. In the present embodiment, however, the electromagnetic wave transceiving antenna 1120 configured on one side of the golf ball and used to transmit a signal to the golf ball and receive a signal reflected from the golf ball can be formed.

[0092] As Figure 8 shown in the present embodiment, as in the embodiment of Figure 4 , the MCU 1411, the motor control portion 1412 for controlling the driving of the motor, the transmission circuit 1413 for generating a signal to be transmitted from the electromagnetic wave transceiving antenna 1120 and transmitting the same, the reception circuit 1414 for processing a signal received from the electromagnetic wave transceiving antenna 1120, and the communication portion 1415 for transmitting the signal processed by the reception circuit 1414 to the analysis portion 200 constituted by a terminal or a PC can be formed on the control board 190.

[0093] Further, as Figure 9 shown in the present embodiment, as in the embodiment of Figure 6 , the function of the transceiving circuit for generating a signal to be transmitted from the electromagnetic wave transceiving antenna 1120 and transmitting the same to the electromagnetic wave transceiving antenna 1120, and receiving a signal received from the electromagnetic wave transceiving antenna 1120 and processing the same can be performed by the network analyzer 1420. At this time, information related to the size and phase of the signal processed by the network analyzer 1420 can be transmitted to the analysis portion 200 in real time, and the result of the screening can be displayed on the display.

[0094] At this time, the operation of the motor control portion 1412 for driving the first motor 171 or the second motor 173 can be controlled by the control command of the PC.

[0095] Further, as Figure 10 shown in the present embodiment, as in the embodiment of Figure 7The embodiments of the present application can also perform the function of the transceiver circuit by a signal generator 1430 for generating a signal to be transmitted from the electromagnetic wave transceiving antenna 1120 and transmitting the signal to the electromagnetic wave transceiving antenna 1120 and a spectrum analyzer 1432 for receiving a signal received from the electromagnetic wave transceiving antenna 1120 and processing the signal. At this time, information related to the size and phase of the signal processed by the spectrum analyzer 1432 can be transmitted to the analysis unit 200 in real time, and the result of the screening in the analysis unit 200 can be displayed on the display.

[0096] In the present embodiment, the operation of the motor control unit 1412 for driving the first motor 171 or the second motor 173 can also be controlled by a control command of the PC.

[0097] In addition, in the embodiments of the present application, the detector 140 can further be provided with a circulator 1440 for distinguishing between the transmission and reception of signals during the transmission of the signals. Figure 8 to Figure 10

[0098] In the following description, the principle of screening of golf balls according to the present application and the experimental results regarding the screening effect are described.

[0099] Figure 11 is a graph showing the transmission and reflection of electromagnetic wave signals with respect to the internal and external symmetry of a golf ball (a), the internal core eccentricity of a golf ball (b), the internal core asymmetry and unevenness of a golf ball (c), and the damage to the external shell of a golf ball (d), Figure 12 is a perspective view of a golf ball for explaining the eccentricity of the golf ball.

[0100] The core, inner skin, and outer skin of the golf ball can be composed of different materials from each other. For example, the golf ball can be composed of a core of rubber material, an inner skin layer of plastic material, and an outer skin layer of thermosetting polyurethane, thermoplastic polyurethane, or ionomer plastic material. In addition, in order to increase the flight distance of the golf ball, various materials have been developed and applied to golf balls, and each manufacturer has also applied a composite material to the golf ball.

[0101] When the electromagnetic wave transmitted from the electromagnetic wave transmitting antenna 110 or the electromagnetic wave transceiving antenna 1120 is incident on the golf ball, scattering and transmission of the incident wave occur on the boundary surface of the different materials constituting the golf ball. At this time, the reflected wave can be transmitted again to the electromagnetic wave transceiving antenna 1120, and the transmitted wave can be received by the electromagnetic wave receiving antenna 120 on the opposite side. The reflection and transmission characteristics of the electromagnetic wave are very sensitive to the dielectric constant of the medium, and thus the size and phase characteristics of the reflected or transmitted electromagnetic wave can be different depending on the uniformity of the medium inside the golf ball.

[0102] As Figure 11 ​As shown in (a), when the interior of the manufactured golf ball is symmetrical and uniform in structure / physical properties, the reflection or transmission characteristics measured while the golf ball is rotated will be uniform. In this case, the core and outer skin of the golf ball have different physical properties from each other, and the diameter of the golf ball is approximately 42 mm. It is preferable to select a frequency that exhibits good responsiveness in the physical properties of the core and outer skin of such a golf ball for measurement.

[0103] Conversely, when Figure 11 As shown in (b), the inner spherical core layer is eccentric in a specific direction, or as... Figure 11 When the medium of the internal spherical core layer is asymmetrical as described in (c), the characteristics of the electromagnetic waves reflected or transmitted on each measurement surface will be different from each other.

[0104] In addition, in such Figure 11 As shown in (d), when asymmetric damage occurs on the shell, the reflection or transmission characteristics measured on each measurement surface may also differ. Since external defects are relatively small compared to the size of a golf ball, it is preferable to perform measurements at a higher frequency than when detecting the uniformity and eccentricity within the golf ball.

[0105] Therefore, in this invention, the internal uniformity of the golf ball can be quantitatively evaluated based on the characteristics of electromagnetic waves (the magnitude and phase uniformity of the reflected or transmitted signal) measured while the golf ball is rotated by the rotating support.

[0106] Reference Figure 12 As shown in mathematical formula 1, the eccentricity can be represented by the ratio of the distance r from the center P1 of the golf ball to the center P2 of the core to the radius of the golf ball.

[0107] [Mathematical Expression 1]

[0108] Eccentricity (ε) = r (distance from the center of the golf ball to the center of the core) / R (radius of the golf ball)

[0109] As shown in Equation 1, when the nucleus is precisely located at the center of the golf ball, and thus the centers of the golf ball and the nucleus coincide, the distance r from the center of the golf ball to the center of the nucleus is 0, and therefore the eccentricity is also 0. Furthermore, the greater the distance from the center of the golf ball to the center of the nucleus, the larger r becomes, and therefore the eccentricity ε also increases.

[0110] Figure 13 and Figure 14 This is a graph showing the results of measuring the electromagnetic wave transmission characteristics using the golf ball screening device according to the present invention. Figure 15 It means to be in Figure 14 A graph showing the results of hitting a wood with a swing speed of 115 mph using balls selected in (a) and balls selected in (b).Figure 16 is a graph showing the results of wood shots at 95 mph swing speed for the balls screened in Figure 14 (a) and the balls screened in (b), Figure 17 is a graph showing the results of 7-iron shots at 85 mph swing speed for the balls screened in Figure 14 (a) and the balls screened in (b), Figure 18 is a graph showing the results of wedge shots at 75 mph swing speed for the balls screened in Figure 14 (a) and the balls screened in (b).

[0111] Figure 13 (a) of FIG. 1 shows the magnitude of the received electromagnetic wave with respect to the frequency at different bad golf ball eccentricities, Figure 13 (b) of FIG. 1 shows the phase of the received electromagnetic wave with respect to the frequency at different bad golf ball eccentricities. Referring to Figure 13 it can be seen that the magnitude and position of the electromagnetic wave transmission are different when the eccentricity is different. It can be seen that when the eccentricity increases from 0 to 0.2, the magnitude of the transmission gradually increases at frequencies lower than F3, and gradually decreases as the eccentricity increases at frequencies higher than F3.

[0112] In particular, in the phase characteristics, the magnitude and phase sensitively change between the specific frequencies F2-F5 depending on the degree of eccentricity. Therefore, the degree of imbalance of symmetry including the eccentricity inside the golf ball can be estimated based on the transmission and reflection characteristics of the electromagnetic wave.

[0113] In particular, the data set of the eccentricity, the transmission and reflection characteristics can be applied to a deep learning technique to quantify the eccentricity and the balance, and thereby realize automatic screening of bad golf balls.

[0114] Figure 14 is the result of measuring the electromagnetic wave transmission characteristics of a specific brand of golf balls commercially available using the golf ball screening device according to the present application. The transmission coefficient was measured while rotating the golf balls in the same package, and the golf ball with the smallest difference between the maximum and minimum values of the transmission coefficient (SOD: Sum of Deviation) (ball-A) Figure 14 (a) of FIG. 1) and the golf ball with the largest difference (ball-B) Figure 14 (b) of FIG. 1) were screened.

[0115] From the measurement results of Figure 14 it can be seen that the maximum transmission coefficient values of ball-A and ball-B are substantially the same, but for the minimum transmission coefficient, ball-B is about 1 dB lower than ball-A at all measured frequencies.

[0116] To verify how much the selected balls-A and balls-B differ in flight characteristics (flight distance and left-right deviation) when actually hit by a golf club, a test was conducted using a swing robot of KIGOS (Korea Institute of Golf and Sports). Unlike human swings, the robot can repeatedly perform a golf swing at the same speed and mechanism, so that the same position on the face of the club can be hit every time. The flight trajectory of the golf ball was analyzed using a Foresight GC Quad launch monitor. The GC Quad launch monitor excludes external factors such as wind or humidity that affect the flight of a golf ball, so it can provide a strict flight trajectory result based only on the characteristics of the golf ball.

[0117] Wood shot tests were conducted at two swing speeds of 95 mph and 115 mph (medium and fast). A TaylorMade TSi2 wood club equipped with a 65-gram regular stiffness shaft and a 75-gram super stiff shaft was used for 95 mph and 115 mph swings, respectively. In addition, the same tests were conducted for a 7-iron (85 mph) and a wedge (75 mph) using a Fourteen TC-544 forged iron.

[0118] In addition, the numbers "1" to "14" were marked on the surface of each golf ball so that the test club could hit the ball at 14 different positions, and the distance and left-right deviation of the shot were measured 14 times for each golf ball.

[0119] The wood shot test results at 115 mph and 95 mph swing speeds clearly indicate the difference between balls-A and balls-B Figure 15 and Figure 16 ). The ball with a lower SOD flew with less distance deviation, and in particular, the left-right deviation of the ball-A was much superior to that of the ball-B. The deviation of the ball-B with a higher SOD was more than 2.4 times greater than that of the ball-A. The test results for 7-iron and wedge shots can also be confirmed in Figure 17 and Figure 18 , and it can be confirmed that the ball-A with a lower SOD showed superior consistency to the ball-B as much as the wood shot results.

[0120] The scope of the right of the present application is not limited to the above-described embodiments, and can be implemented in various forms within the scope of the attached claims. Various modifications can be made by those skilled in the art to which the present application pertains without departing from the spirit of the present application claimed in the claims, and such modifications also belong to the scope of the claims recited in the present application.

Claims

1. A golf ball screening device characterized by, Comprising: a measurement unit including a rotation support unit for rotatably supporting a golf ball, and for transmitting a signal to the golf ball and receiving a signal reflected from the golf ball or transmitted through the golf ball; and an analysis unit for analyzing the received signal and screening the golf ball, wherein the rotation support unit includes: a first rotation support plate for supporting a first position of the golf ball by a side surface and rotating by a motor; a second rotation support plate for supporting a second position of the golf ball by a side surface and rotating by a motor; and a rotation rod freely rotating at both sides and supporting a third position of the golf ball, wherein the first position and the second position are two positions orthogonal with respect to the center of the golf ball when viewed from above, wherein the third position is located at the center of the opposite side of the first position and the second position with respect to the center of the golf ball when viewed from above, and is located at the lower side of the golf ball when viewed from the side.

2. The golf ball screening device according to claim 1, wherein the measurement unit further includes: an electromagnetic wave transmitting antenna disposed at one side of the golf ball for transmitting an electromagnetic wave to the golf ball; and an electromagnetic wave receiving antenna disposed at the other side of the golf ball for receiving the electromagnetic wave transmitted from the electromagnetic wave transmitting antenna.

3. The golf ball screening device according to claim 1, wherein the measurement unit further includes: an electromagnetic wave transceiving antenna disposed at one side of the golf ball for transmitting an electromagnetic wave to the golf ball and receiving the reflected electromagnetic wave.

4. The golf ball screening device according to claim 1, wherein the signal is an RF electromagnetic wave signal.

5. The golf ball screening device according to claim 2 or 3, wherein the signal is an electromagnetic wave, and the golf ball screening device further includes a detector for generating and transceiving the electromagnetic wave, and outputting and detecting the magnitude and phase of the received electromagnetic wave.

6. The golf ball screening device according to claim 5, wherein the detector is composed of a transmitting circuit and a receiving circuit, or composed of a network analyzer, or composed of a signal generator and a spectrum analyzer.

7. The golf ball screening device according to claim 1, wherein the analysis unit screens the golf ball having an internal uniformity and close to symmetry based on the uniformity of the signals received by the plurality of measurement surfaces while the golf ball is rotated.

8. The golf ball screening device according to claim 7, wherein the analysis unit screens the golf ball having an internal uniformity and close to symmetry based on the uniformity of the magnitude and phase of the signals received by the plurality of measurement surfaces.

9. The golf ball screening device according to claim 1, wherein the analysis unit screens the golf ball having an internal uniformity and close to symmetry based on the magnitude and phase of the signals received by the plurality of measurement surfaces based on deep learning. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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