JP2011089763A - Bullet position measuring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bullet position measuring device for reducing restriction of measurement area sizes and bullet types which can be measured. <P>SOLUTION: The bullet position measuring device includes a plurality of light generators 3a-3g linearly installed to have intervals, a light emission control part 7 for controlling light emission of the light generators, a light receiving device 5 extending to correspond to curtain-shaped lights formed by the light generators in a direction of aligning the light generators at positions facing to a plurality of the light generators, and a bullet passing position calculation part 9 for calculating a position of a bullet passing through a measuring area 13 including an area where the curtain-shaped lights formed by at least two light generators overlap each other. The light emission control part forms a plurality of groups, each of which includes a plurality of light generators at positions where the curtain-like lights does not overlap each other, to make the groups repeatedly emit light in turns at predetermined periods. The position of the bullet passing through the measuring area is calculated based on information of a position and a range of a bullet shadow obtained by light-shielding of the bullet 8 when two different light generators emit light and information of positions of the two different light generators emitting light at the time. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bullet position measuring device that measures the passage position of a bullet in order to detect the landing position of a bullet, and more particularly to a bullet position measuring device that is suitable for shooting training using real bullets and simulated bullets including training bullets. .

  As an apparatus for detecting the landing position of a bullet, an electronic shooting target that can detect the position where the bullet hits the target in a non-contact manner has been proposed (for example, see Patent Document 1). Such an electronic target for shooting is a light sensor array in which a light source and a light sensor are arranged in a line at a position facing the light source around the shooting side, that is, the front side of the window to which the target is attached. And at least one set is provided. That is, the target is in a corresponding position between the light source and the photosensor array. Then, when the bullet reaches the target, light from the light source is blocked by the bullet, so that among the optical sensors constituting the optical sensor array, an optical sensor that cannot detect light is generated, and the light that cannot detect this light. The bullet landing position is calculated based on the sensor position.

  On the other hand, in order to detect the landing position of a bullet, a bullet position measuring apparatus that measures the trajectory of a bullet, that is, a passing position at the time of flight, based on light reflected by the bullet has been proposed (for example, see Patent Document 2). Such a bullet position measuring device irradiates a laser beam in the middle of a bullet trajectory, that is, in front of the target, and forms a flat curtain-like light in a space equal to or larger than the target. One or more laser light oscillators and two or more light receivers that receive reflected light reflected by bullets from the laser light emitted from the laser light oscillator are provided. Then, the generation angle of the reflected light is calculated from the output signal indicating the position of the laser reflected light detected by each light receiver, and the bullet passing position in the measurement area irradiated with the laser light is calculated based on the generation angle of the reflected light. is doing.

JP-A-7-225100 (page 2-3, FIG. 1, FIG. 2)

JP-A-9-197037 (page 4-6, FIG. 1)

  By the way, in an electronic shooting target such as Patent Document 1, in order to improve the measurement accuracy of a bullet position, a set of a light source and an optical sensor array is used to irradiate light emitted from the light source around the target. It is necessary to provide two sets so that the traveling directions intersect. At this time, the measurement area for measuring the position of the bullet is only an area where light emitted from two light sources intersect and overlap, for example, only about half of the area where light is actually emitted from each light source. In other words, a useless area in which the bullet passage position cannot be measured increases. For this reason, in order to make the measurement region larger than the target area, for example, when about half of the region actually irradiated with light from each light source is the measurement region, the measurement region is separated by more than twice the target width. There is a need. Therefore, if the distance between the light source and the optical sensor array is limited by conditions such as the size of the installation location, the position of the bullet will be limited so that the area of the measurement area from which the light is irradiated is also limited. There is a limit to the size of the measurement area for measuring the.

  On the other hand, in the bullet position measuring apparatus described in Patent Document 2, even if a plurality of laser light oscillators are provided at different positions in order to improve the measurement accuracy of the bullet position, the bullet passage position based on the reflected light Therefore, there is no problem such as an interval for installing a plurality of laser light oscillators and light receivers. Therefore, it is difficult to limit the width of the measurement area. However, in the bullet position measuring device as described in Patent Document 2, the surface of the laser bullet needs to be made of a material that reflects the laser beam, and when a lead training bullet or a plastic training bullet is used. The reflected light necessary for measuring the position of the bullet cannot be obtained, and the passage position of the bullet may not be measured depending on the type of the bullet, which limits the type of bullet that can be measured. For this reason, there is a need for a bullet position measuring device in which the size of the measurement area and the types of bullets that can be measured are not limited.

  An object of the present invention is to provide a bullet position measurement device in which the size of a measurement region and the types of bullets that can be measured are not easily limited.

  The bullet position measuring device of the present invention irradiates the target to be fired with a flat curtain-like light in a direction intersecting with the bullet trajectory, and is installed in a straight line at a predetermined interval. A plurality of light generators, a light emission control unit for controlling light emission of the light generators, and a curtain formed by the light generators in a direction facing the plurality of light generators in a direction in which the plurality of light generators are arranged. A measurement area is defined by combining a light receiver extending corresponding to the light in the form of light and a region in which curtain-shaped light formed by at least two light generators overlaps based on an output signal from the light receiver. A bullet passage position calculation unit for calculating the position of the bullet passing through the measurement area, and the light generator is spaced so that the measurement area covers at least a planar space having the same size as the target. The light emission control unit has a curtain-like light A plurality of light generators at positions that do not overlap with each other is formed as one set, and the smaller of the thickness of the bullet-shaped light in the measurement region and the width of the light receiving surface of the light receiver is determined from the length of the bullet. A set of light emission periods set based on the value obtained by dividing the subtracted value by the velocity of the bullet. Information on the position and range of the shadow generated by being shielded by the bullet that passes is output to the bullet passage position calculator, and the bullet passage position calculator is used when two different light emitters emit light. Based on the obtained bullet shadow position and range information and the information on the positions of the two different light generators that were emitting at that time, the direction of the center position of the bullet relative to the two different light emitter positions. The two angles corresponding to are calculated, and the two calculated Based on time, to solve the above problems by a calculated composed configure the position of the bullet passing through the measurement region.

  By adopting such a configuration, the information about the shadow formed by being blocked by the bullet without using the reflected light from the bullet is obtained by the light receiver, and the information about the shadow of the bullet obtained by this light receiver is obtained. Based on this, the bullet passing position can be measured. As described above, since the bullet passing position is measured using the bullet shadow information without using the reflected light, it is difficult to limit the types of bullets that can be measured. Furthermore, the size of the measurement area can be expanded by adjusting the number of light generators installed side by side, the installation interval, the length of the light receiver, etc. Since there is no need to separate the interval, it is difficult for the measurement area to be limited. Therefore, it is possible to provide a bullet position measuring device in which the size of the measurement area and the types of bullets that can be measured are not easily limited.

  Also, by calculating the position of the bullet passing through the measurement region based on the angle indicating the direction of the center position of the bullet relative to the position of at least two different light generators, the measured bullet passing position and the actual bullet The error with the passage position can be corrected, and the measurement accuracy of the bullet passage position can be further improved.

  According to the present invention, it is possible to provide a bullet position measuring device in which the size of a measurement region and the types of bullets that can be measured are not easily limited.

1 is a perspective view showing a schematic configuration of a bullet passage position measuring apparatus according to a basic example of the present invention with a part of a light receiver broken away. FIG. It is a front view explaining the relationship between the several laser oscillator, light receiver, and measurement area | region in the bullet passage position measuring device which concerns on the basic example of this invention. It is a figure explaining how to obtain | require the angle corresponding to the direction of the position of the center of a bullet with respect to the position of the laser oscillator in the bullet passage position measuring device which concerns on the basic example of this invention. It is a figure explaining how to obtain the bullet passage position based on the angle corresponding to the direction of the center position of the bullet with respect to the position of the laser oscillator in the bullet passage position measuring apparatus according to the basic example of the present invention. It is a figure explaining an example for expanding a measurement field in a bullet passage position measuring device formed by applying the invention.

(Basic example)
In the following, a basic example of the present invention will be described with reference to FIGS. 1 to 4, and then embodiments of the present invention will be described. FIG. 1 is a perspective view showing a schematic configuration of a bullet passage position measuring apparatus according to a basic example of the present invention, with a part of a light receiver broken. FIG. 2 is a front view for explaining the relationship among a plurality of laser oscillators, light receivers and measurement regions in the bullet passage position measuring apparatus according to the basic example of the present invention. FIG. 3 is a diagram for explaining how to obtain an angle corresponding to the direction of the center position of the bullet relative to the position of the laser oscillator in the bullet passage position measuring apparatus according to the basic example of the present invention. FIG. 4 is a diagram for explaining how to obtain the bullet passage position based on the angle corresponding to the direction of the center position of the bullet relative to the position of the laser oscillator in the bullet passage position measuring apparatus according to the basic example of the present invention.

  As shown in FIG. 1, the bullet passing position measuring apparatus 1 of the present basic example irradiates a flat curtain-like light, and laser oscillators 3a to 3g serving as a plurality of light generators installed at predetermined intervals. A light receiving control circuit that controls the oscillation of the laser, that is, the light emission of the laser receiver 3a-3g, the light receiver 5 extending in the direction in which the laser oscillators 3a-3g are arranged facing the laser oscillator 3a-3g 7. A bullet passage position calculation unit 9 that calculates the passage position of the bullet 8 based on an output signal from the light receiver 5 and the like is provided.

  The laser oscillator 3a-3g and the light receiver 5 are installed in front of the target 11, that is, on the side where the bullet 8 is fired, and the laser oscillator 3a-3g has the same size as or larger than the target 11. Irradiate a planar space. The laser oscillators 3a to 3g are installed in one row in a state of being separated in advance so that the positions of the bullets 8 passing through a necessary range according to the size of the target 11 can be measured.

  In this basic example, the laser oscillators 3a to 3g are arranged side by side at positions corresponding to the upper part of the upper edge portion of the target 11 in the direction along the plane of the planar target 11, and are fan-shaped downward. Oscillates a flat curtain-shaped laser beam that spreads. Accordingly, the curtain-like laser light oscillated from the laser oscillators 3 a to 3 g is formed in a direction intersecting with the trajectory t of the bullet 8. At this time, the region including the overlapping portions of the curtain-shaped laser beams formed when at least two of the laser oscillators 3a to 3g are oscillated is a measurement region 13 for measuring the passing position of the bullet 8. Can be. Therefore, the number of laser oscillators, the installation interval of the laser oscillators, and the like are determined so that the measurement region 13 is at least within a range where it is necessary to measure the position of the bullet 8 passing therethrough.

  In this basic example, when actually measuring the passing position of the bullet 8, the light emission of each laser oscillator 3 a-3 g is controlled by the light emission control circuit 7 so as to sequentially emit light alternately. In this basic example, a line laser oscillator that oscillates a laser beam in a curtain shape is used as the laser oscillators 3a to 3g in order to form a curtain-like laser beam. The laser oscillators 3 a to 3 g and the light emission control circuit 7 are electrically connected via the wiring 14.

  The light receiver 5 includes a plurality of light receiving elements 15 arranged in a straight line, a signal processing circuit 17 electrically connected to the plurality of light receiving elements 15, and the like. The light receiver 5 receives the curtain-like laser light oscillated from the laser oscillators 3a to 3g, and directs the surface on which the plurality of light receiving elements 15 are arranged on the side facing the laser oscillators 3a to 3g. 3a-3g is installed in the state extended along the direction arrange | positioned in a line. Therefore, in this basic example, the light receiver 5 is horizontally installed at a position facing the laser oscillator 3a-3g and corresponding to a position below the lower edge portion of the target 11. Note that the length of the light receiver 5 and the number of the plurality of light receiving elements 15 arranged in a straight line are determined according to the required length of the measurement region 13 at the position of the light receiving surface of the light receiver 5.

  The signal processing circuit 17 of the light receiver 5 shields the curtain-shaped laser light oscillated from one of the laser oscillators 3a to 3g when the bullet 8 emitted from the firearm 19 or the like passes through the measurement region 13. Sometimes, it is determined which part of the plurality of light receiving elements 15 where the boundary between the part irradiated with the laser beam and the part shielded from light is aligned. That is, the signal processing circuit 17 of the light receiver 5 can receive the laser light irradiated from any one of the laser oscillators 3a to 3g by the bullet 8 that passes through the measurement region 13 and the light receiving element 15 that has received the laser light. The position and range of the shadow formed by the bullet 8 passing through the measurement region 13 is detected from the position of the light receiving element 15 that has not been present.

  The bullet passage position calculation unit 9 emits light when detecting the shadow position and range information detected by the signal processing circuit 17 of the light receiver 5 and the position and range information of the shadow among the laser oscillators 3a to 3g. Based on the information from the light emission control circuit 7 for specifying the position of the laser light oscillator, the laser that was oscillating when detecting the position and range information of the shadow among the laser oscillators 3a to 3g An angle corresponding to the direction of the center position of the bullet 8 relative to the position of the optical oscillator is calculated. The bullet passage position calculation unit 9 calculates the passage position of the bullet 8 in the measurement region 13 based on the calculated angle.

  As described above, the bullet passage position measuring apparatus 1 of the basic example shows the shadow of the bullet 8 passing through the measurement region 13 based on the control information when the light emission control circuit 7 sequentially emits the laser oscillators 3a to 3g. When the light receiver 5 detects, it is possible to determine which one of the laser oscillators 3a to 3g is a shadow produced by light. The bullet passage position calculation unit 9 and the signal processing circuit 17 of the light receiver 5, and the bullet passage position calculation unit 9 and the light emission control circuit 7 are electrically connected to each other via a wiring 14. Further, the bullet passage position calculation unit 9 has a communication line 23, and calculates the landing position of the bullet 8 on the target 11 based on information on the passage position of the bullet 8 from the bullet passage position calculation unit 9, for example. Information on the passing position of the bullet 8 can be output to an external device or the like.

A method for measuring the passage position of the bullet 8 in the bullet passage position measuring apparatus 1 having such a configuration will be described. In the bullet passage position measuring apparatus 1 of this basic example, the light emission period of each laser oscillator 3a-3g that emits light sequentially is determined by the light emission control circuit 7 according to the following equation (1).

T = (Lb−L1) / Vb (1)

In equation (1), T is the emission period of each laser oscillator 3a-3g that emits light sequentially, Lb is the minimum length of the bullet 8 to be measured, Vb is the maximum velocity of the bullet 8 to be measured, and L1 is the smaller of the thickness and the width of the light receiving surface of the light receiver 5, that is, the width of the light receiving element 15.

  Thus, the light emission control circuit 7 sequentially and repeatedly emits the laser oscillators 3a-3g in the order of the laser oscillators 3a, 3b, 3c, 3d, 3e, 3f, and 3g, thereby forming the light emitted from the laser oscillators 3a-3g. As shown in FIG. 2, the curtain-shaped laser beams 25a to 25g are sequentially and repeatedly irradiated in the order of the curtain-shaped laser beams 25a, 25b, 25c, 25d, 25e, 25f, and 25g. The range including the overlapping portions of the laser light emitted from at least two laser oscillators of the laser oscillators 3a to 3g can be the measurement region 13. The measurement region 13 is also defined by the length of the light receiving surface of the light receiver 5 indicated by a solid line in FIG. 2, that is, the length in which the light receiving elements 15 are arranged.

  Sequentially emitted curtain-like laser beams 25 a to 25 g are received by the light receiver 5, but when the bullet 8 passes through the measurement region 13, a part of the curtain-like laser light is shielded by the bullet 8. Thus, the light receiver 5 recognizes a place where the curtain-shaped laser beam cannot be received as a shadow of the bullet 8 and outputs information on the position and range of the shadow to the bullet passage position calculation unit 9. The bullet passage position calculation unit 9 has position information of each laser oscillator 3a-3g in advance, and emits light from information identifying the emitted laser oscillator among the laser oscillators 3a-3g from the light emission control circuit 7. The position information of the laser oscillator is obtained.

  Then, the bullet passage position calculation unit 9 of this basic example is based on the information on the position and range of the shadow from the light receiver 5 and the position information of the laser oscillator that emits light when the shadow is detected. As shown in FIG. 3, the laser oscillator 3 emitting light when the shadow is detected as an angle corresponding to the direction of the position of the center C of the bullet 8 relative to the laser oscillator 3 emitting light when the shadow is detected. And an angle θ formed by a line connecting the position of the center C of the bullet 8 and the horizontal line is calculated.

Here, the information on the position and range of the shadow obtained by the light receiver 5 means that among the plurality of light receiving elements 15 in the light receiver 5, which light receiving elements 15 are irradiated with the laser light and the laser light. It is information indicating whether or not the boundary of the part that has not been irradiated. Therefore, the range of the shadowed portion when the bullet 8 passes through the measurement region 13 is changed from R (n) to R (n + 1), and the coordinates of the laser oscillator 3 emitting at that time are (XL, YL). When the arrangement pitch of the light receiving elements 15 is P, the angle θ formed by the line connecting the laser oscillator 3 and the position of the center C of the bullet 8 and the horizontal line can be calculated by the following equations (2)-(4).

θmax = tan ⁻¹ {YL / (XL−R (n) × P)} (2)
θmin = tan ⁻¹ {YL / (XL−R (n + 1) × P)} (3)
θ = (θmax + θmin) / 2 (4)

Θmax is the larger angle of the angle between the line connecting the laser oscillator 3 and the outer peripheral surface of the bullet 8 and the horizontal line, and θmin is the horizontal line connecting the line connecting the laser oscillator 3 and the outer peripheral surface of the bullet 8. The smaller one of the angles formed by.

Further, as shown in FIG. 2, the bullet passage position calculation unit 9 is a laser oscillator in which a shadow of a bullet is formed by light emission among the laser oscillators 3a, 3b, 3c, and 3d that can detect the shadow of the bullet 8. The position of the bullet 8 is calculated from the two angles θ calculated as described above with respect to the laser oscillators 3a, 3d at the position where the separation distance between the laser oscillators is the longest among 3a, 3b, 3c, 3d. Here, as shown in FIG. 4, two angles of the position of the center C of the bullet 8 relative to the laser oscillators 3a and 3d are θ1 and θ2, respectively, and the coordinates of the two laser oscillators 3a and 3d are (X1, Y1), respectively. , (X2, Y2), the passing position coordinates (Xp, Yp) of the bullet 8 can be calculated by the following equations (5)-(8).

A = Y1-X1 × tan θ1 (5)
B = Y2−X2 × tan θ2 (6)
Xp = (B−A) / (tan θ1−tan θ2) (7)
Yp = Xp × tan θ1 + A (8)

Then, the coordinates of the passage position of the bullet 8 in the measurement region 13 calculated by the bullet passage position calculation unit 9, that is, the information on the passage position of the bullet 8 are output to an external device or the like via the communication line 23 as shown in FIG. Is done.

  As described above, in the bullet passing position measuring apparatus 1 of this basic example, the laser oscillators 3a to 3g, which are a plurality of light generators installed at predetermined intervals to form curtain-like light, and laser oscillators The light receiver 5 that receives the laser light from 3a-3g, the light emission control circuit 7 that is a light emission control unit that sequentially emits the laser oscillator 3a-3g, and the bullet passage position calculation that calculates the position of the bullet 8 that passes through the measurement region 13 By providing the unit 9 and the like, the passing position of the bullet 8 in the measurement region 13 can be measured based on the information about the shadow formed by the laser beam being shielded by the bullet 8. That is, the bullet passing position can be measured without using the reflected light from the bullet. For this reason, for example, it is possible to measure the passing position of a bullet even if it is a type of bullet that cannot be reflected by lead training bullets, plastic training bullets, or other surface materials. Restrictions are unlikely to occur. On the other hand, since there is no limit to the number of laser oscillators that are light generators, by increasing the number of laser oscillators, etc., it is possible to reduce the useless area where the bullet passage position cannot be measured, and to increase the number of measurement areas. It is not necessary to increase the distance between the light generator and the light receiver, and it is difficult to limit the size of the measurement area. Therefore, it is possible to provide a bullet position measuring device in which the size of the measurement area and the types of bullets that can be measured are not easily limited.

  By the way, the conventional bullet passage position measuring device that uses the reflection of laser light bullets does not take into account the size of the bullets, that is, the diameter of the bullets. An error occurs between the actual bullet passing position and the calculated passing position.

  On the other hand, in the bullet passage position measuring apparatus 1 of this basic example, the light receiver 5 is shielded by the bullets passing through the measurement region 13 with the laser light generated by the three or more installed laser oscillators 3a-3g. The information on the position and range of the shadow generated by this is output to the bullet passage position calculation unit 9. The bullet passage position calculation unit 9 emits light from the two laser oscillators 3a, 3d installed at the farthest positions among the laser oscillators 3a, 3b, 3c, 3d in which bullet shadows are formed by light emission. The positions of two different laser oscillators 3a, 3d calculated based on the information on the position and range of the shadow of the bullet obtained during the operation and the information on the positions of the laser oscillators 3a, 3d emitting at that time The position of the bullet passing through the measurement region 13 is calculated based on the angles θ1 and θ2 corresponding to the direction of the position of the center C of the bullet relative to. Thereby, the error between the measured bullet passage position and the actual bullet passage position can be corrected, and the measurement accuracy of the bullet passage position can be improved.

  However, it is also possible to select an angle with respect to any at least two laser oscillators that can detect the shadow width of the bullet 8 by light emission, and calculate the bullet passing position based on these angles. In this case, in order to correct the error between the measured bullet passage position and the actual bullet passage position and improve the measurement accuracy of the bullet passage position, increase the number of angles to the laser oscillator used in the calculation. Alternatively, an average value of the calculated plurality of bullet passing positions is obtained.

  Therefore, like the bullet passage position measuring apparatus 1 of the basic example, two laser oscillators installed at the farthest positions out of the three or more laser oscillators formed with bullet shadows emit light. Position of the bullet passing through the measurement region 13 based on two angles calculated based on the information on the position and range of the shadow of the bullet obtained at the time and the information on the position of the laser oscillator emitting light at that time When the bullet passage position calculation unit 9 is configured to calculate the bullet passage position from two angle values, the error between the measured bullet passage position and the actual bullet passage position is calculated. It can correct more accurately and can further improve the measurement accuracy of the bullet passage position. In addition, when trying to obtain a bullet passage position with the same degree of measurement accuracy, the bullet passage position measurement device 1 of the present basic example can obtain the bullet passage position with simpler arithmetic processing.

  Furthermore, in the bullet passage position measuring apparatus 1 of the present basic example, the bullet passage position is measured based on the information about the shadow formed by the laser light being shielded by the bullet, so that it is not affected by the bullet velocity. It is possible to measure the bullet passage position. In addition, in the bullet passage position measuring apparatus 1 of this basic example, the position through which the center of the bullet has passed can be measured, so the bullet passage position can be measured without being influenced by the size of the bullet. Further, by calculating the position of the bullet hitting the target using the bullet passage position information obtained by the bullet passage position measuring apparatus 1 of the basic example, the detection accuracy of the position of the bullet hitting the target can be improved. .

  In this basic example, when the light emission control circuit 7 serving as a light emission control unit causes the laser oscillators 3a-3g to alternately emit light in turn, that is, the light emission of the laser oscillator 3a-3g so that only one laser oscillator always emits light. The case where is controlled is described as an example. However, as will be described later, the light emission control unit includes a light emission control unit that controls a plurality of light generators at positions where the curtain-like light formed by the light generators do not overlap at the same time. It can also be.

(Embodiment)
Here, an embodiment of the present invention will be described. For example, as shown in FIG. 5, when a larger number of laser oscillators 3 are installed than in the above basic example, the laser oscillators 3x and 3y in which the curtain-like laser light 25 formed even if they are simultaneously emitted do not overlap. 3z may be obtained. In this case, the light emission control unit simultaneously emits the laser oscillators 3x, 3y, and 3z in which the formed curtain-like laser light 25 does not overlap. Furthermore, the light emission control unit simultaneously emits the laser oscillators 3 at positions where the formed curtain-like laser lights 25 such as the laser oscillators 3x, 3y, and 3z do not overlap as one set, and at such positions. The set of laser oscillators 3 that are related are repeatedly emitted in order. With such a configuration in which the light emission control unit is provided, even when a larger number of laser oscillators 3 are provided, the region including the overlapping portions of the laser beams 25 irradiated by at least two laser oscillators 3 is combined with a bullet. The measurement area 13 for measuring the passage position can be formed, and thus the measurement area can be expanded.

  In addition, the bullet passage position measuring device of the present invention is not limited to the bullet passage position measuring device 1 having the above-described configuration, and may include a plurality of light generators, a light emission control unit, a light receiver, a bullet passage position calculation unit, and the like. Can be formed in various configurations. For example, it can be formed in various configurations, such as a configuration in which the light emission control unit and the bullet passage position calculation unit are integrated, or a configuration in which the light emission control unit and the bullet passage position calculation unit are integrated with the signal processing circuit of the light receiver. . Further, a configuration in which a plurality of light generators are point light sources such as LEDs and lamps, and a flat curtain-shaped measurement region for measuring the position of a bullet is formed by combination with a light receiver.

DESCRIPTION OF SYMBOLS 1 Bullet passing position measuring device 3a-3g Laser oscillator 5 Light receiver 7 Light emission control circuit 8 Bullet 9 Bullet passing position calculating part 11 Target 13 Measurement area 15 Light receiving element 17 Signal processing circuit

Claims (1)

A plurality of light generators arranged in a straight line at a predetermined interval, irradiating a target that is a target of shooting with a flat curtain-like light in a direction intersecting with the bullet trajectory; A light emission control unit that controls light emission of the light generator, and a curtain-like light formed by the light generator in a direction in which the light generators are arranged at positions facing the light generators. And passing through the measurement region, the region including the region where the curtain-shaped light formed by at least two of the light generators overlap is measured based on the output signal from the light receiver. A bullet passage position calculating unit for calculating the position of a bullet to be operated, and the light generator is arranged at an interval so that the measurement region covers at least a planar space having the same size as the target. Become
The light emission control unit forms a plurality of sets of the plurality of light generators at positions where the curtain light does not overlap with each other, and the curtain light of the measurement region is determined from the length of the bullet. Each set of the plurality of sets is caused to emit light repeatedly in order with a light emission period set based on a value obtained by dividing a value obtained by subtracting the smaller one of the thickness of the light receiving surface and the width of the light receiving surface of the light receiver by the speed of the bullet. And
The light receiver outputs information on the position and range of a shadow generated when the light generated by the light generator is blocked by a bullet passing through the measurement region to the bullet passage position calculation unit, and the bullet The passing position calculation unit includes information on the position and range of the bullet shadow obtained when two different light emitters emit light, and the positions of the two different light generators emitted at that time. Based on the information, two angles corresponding to the direction of the center position of the bullet with respect to the two different light emitter positions are calculated, and based on the two calculated angles, the bullets passing through the measurement region are calculated. A bullet position measuring device that calculates the position.

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