JPS5975069A - Swing measuring apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention allows a movable object such as a baseball bat to pass through a predetermined space to determine swing speed, etc. The present invention relates to an electronic swing measuring device for detecting swing.

Conventionally, this type of device uses a laser or a light emitting diode with sharp directivity for transmission, but when the device is in use, a beam of light is constantly emitted, and in the case of a laser, if the laser light enters the eyes, it can cause eye irritation. Risk of damage. On the other hand, in the case of the 9 light emitting diode, it was difficult to transmit sufficient light emitting output due to continuous energization. In addition, both devices have the disadvantage that the life of the device is shortened due to continuous energization.

The present invention has been made to eliminate these drawbacks, and includes a light emitting means for projecting light so as to form first and second bundles of light rays separated by a predetermined distance; a light receiving means for receiving reflected light from the baseball bats passing through each bundle; a detecting means for detecting the passing Z of the baseball bat; and the light emitting means, based on a baseball bat passing detection signal from the detecting means. The present invention provides a swing measuring device that emits light for a predetermined period of time.

Below, one embodiment of the present invention will be explained based on the drawings - 1st
In the figure, (1) is a baseball bat, and (2) is the sensor unit shown in FIG. In Figure 2, (
S) shows the swing trajectory direction of the baseball ball H1+. (2D is a bat passage detector, which is composed of a transmitter (not shown) and a receiver (not shown).

Signal emitted from the transmitter (21a) y (baseball ball) (
When 11 crosses, it emits an output signal. When the transmitting/receiving section 4 used in the bat passage detector Qυ is configured with an infrared light emitting element and a light receiving element, the 5 emitting beam (21a) is used only to detect the passing of the baseball bat (1), so the beam directivity, focus, etc. Since no precautions are required, it can be configured with inexpensive parts.

(221), (222), (223), and (224) are optical transceivers for swing measurement, and the configuration thereof will be explained later in FIG. 3. (22a) (22b) (22c) and (22d) are optical transceivers (221) (222) for measuring the husband's ζ swing.
) (223) and (224).

(3) is a reflective tape attached to a baseball bat (1) that is attached to the surface of a microscopic glass bead with a size of about 501 cm. It has the ability to reflect light.

Figure 3 is a schematic configuration diagram of an optical transmitter/receiver. After converting the beam into a parallel beam using a light emitting lens (5a), it passes through a beam splitter (4) serving as a -7 mirror and is transmitted upward.

Reflective tape (3) attached to the surface of a baseball bat (1)
The reflected light is reflected by the beam splitter (4) and focused on the light receiving element (7) such as a P/N photodiode using the lens (51). No. 4 is impedance-converted and amplified using a preamplifier (8) and output.

FIG. 4 is a block diagram showing the electric circuit used in the present invention, and the case where infrared light is used in the bat passage detector will be explained. A modulated signal of a constant frequency is transmitted from the oscillator α2 through the drive circuit (9) of the bat passage detector Qυ and is projected by a light emitting element (61) such as an infrared light emitting diode. At this point, the optical transceiver for swing measurement (22
i ) (222) (223) (22 transmission is stopped by the control calculation unit (14)).

Next, the baseball bat (11) starts swinging and the light beam (21a) emitted by the bat passage detector Oυ passes.When the baseball bat (1) passes, the light beam (2
1a) is reflective tape (3) attached to a baseball bat (1)
The light is received by the light-receiving element (7) such as a photodiode of the bat passage detector (21), and the fine bones are detected by the preamplifier (
8).

It is transmitted from the voltage comparator Ql+ to the control and calculation section (14) via the bandpass filter QO)Y. Here, according to the irises from the band pass filter (Ill is inserted to distinguish sunlight, other light sources, and its own transmitted light (21a) 'f;f; bat passage detector C71). Output signal (T2) of control calculation unit (+4)
Only the maximum time required to pass between 2a) and (22d) is the rHJ signal. The above rl (by the J signal,
Optical transceiver for swing measurement (221X222X223
) and (224 drive circuits (9) have an AND circuit 0
3) A modulated signal of a constant frequency is supplied through '2 and the beams are connected to the light beams (22a), (22b), (22C) and (22a), respectively.
) 'i project. The electrical signals in this state are shown in FIG.

The signal (T1) is the bat (1) passing signal from the bat passing detection 5 (2B). The signal (T2) is the above signal (T
It is controlled by the input of 1), and is connected to one input terminal of the AND circuit a-th floor with the output output from the arithmetic unit side. Signals (T5), (T4), (Ts) and (T6)
The swing measuring optical transmitter/receiver (221) (222
) (225) and (224) light beams (22a) (
22b) (22ri and (22d) upper bib baseball bat (I
The respective signals when I passes are shown. The above signal (T5
The control calculation unit Q4) calculates the swing speed, height, and angle of the bat (11) based on the signals from XT4XT5) and (T6), and displays them on a display (not shown).

To explain the operation in the above configuration, the bat (1
) before the swing of optical transmission/reception i5 (221) (2
22) (223) and (224) have stopped projecting beams, and only the bat passage detector Qυ is transmitting the light beam (21a).
y projection. When the bat ll'r swings, the bat passing detection m01) first receives the reflected light from the rose 1-(11) that has passed through the light beam (21a), and a signal (T1) based on this light reception signal is sent to the control calculation unit 04). is input. By inputting this signal (T1), the control calculation unit 04
) is output from the oscillator α2, and the modulation signal from the oscillator α2 is outputted from the oscillator α2 by the pulse width of this signal (T2).
), and a beam (
22a) (22b) (22G) (22d). This beam (22a) (22b) (22c) (2
2d) The bat (1) moves gradually, and the reflected light is received by each light receiving element (7), and this received light signal is transmitted to a preamplifier (8) and a band pass filter. The QL voltage is inputted to the control calculation unit 0■ via the voltage comparator (11), processed by the control calculation unit (14), and displayed on a display unit (not shown) as swing-related data.

In this embodiment, the bat passage detector is a Qnk infrared light emitting element, but it is not limited to this and may be an ultrasonic transmitter, for example, as long as it detects the passage of a baseball bat. It's good.

As explained above, the present invention includes a light emitting means for projecting light to form first and second beam bundles separated by a predetermined distance; The light-receiving means receives the reflected light from the baseball bat, and the detecting means detects the passing of the baseball bat, and the light-emitting means is configured to emit light for a predetermined period of time based on the passing detection signal of the baseball bat from the detecting method. Therefore, the life of one light emitting means is not impaired, and a highly reliable swing measuring device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a usage state diagram of a swing measuring device according to an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram of its sensor unit.
FIG. 3 is a schematic configuration diagram of the transmitter/receiver, FIG. 4 is a circuit block diagram thereof, and FIG. 5 is an operational signal diagram thereof. In the figure, (1) is a baseball bat i6) is a light emitting element. (7) is a light receiving element, α fathom is an AND circuit, (1a is a control calculation unit (2)) is a bat passage detector. Fig. 1 Fig. 2

Claims (2)

[Claims] (1) In a swing measurement device that measures the swing speed of a baseball bat passing through a predetermined space. a light emitting means for projecting light so as to form first and second bundles of light rays separated by a predetermined distance; and a light receiving means for receiving and receiving reflected light from a baseball bat that traverses the first and second bundles of light rays, respectively. and a detection means for detecting the passing of the baseball bat, and the light emitting means is made to emit light for a predetermined period of time based on a passing detection signal of the baseball bat from the detection means. . (2) Light emitting means? The swing measuring device according to claim 1, characterized in that it is an infrared light emitting element.