bait

Abstract

Provided is a lure. The lure (1) has a main body portion (2) and a weight portion (3), wherein the main body portion (2) extends in the front-rear direction; the weight portion (3) protrudes downward at a lower portion in front of the main body portion (2), is installed integrally with the main body portion (2), and is made of a material having a specific gravity greater than that of the main body portion (2); and the weight portion (3) has a first ground contact point (Lf) and a center of gravity provided at a position further rearward than the first ground contact point (Lf). Thus, provided is a lure capable of lowering the rear portion near the bottom of water only by using basic structural components (e.g., the main body portion and the weight portion).

Description

Technical Field

[0001] This invention relates to a lure, such as an octopus hook (lure wood) for use as a lure when fishing for octopuses. Background Technology

[0002] In the prior art, as described in Non-Patent Document 1, an octopus hook (hereinafter also simply referred to as "octopus hook") is used for catching octopuses. The octopus hook described in Non-Patent Document 1 has a counterweight at the lower front of the slender main body and a hook for hooking an octopus at the rear end of the main body. The fishing line for connecting the fishing rod is attached to the front end of the main body.

[0003] Based on the habits of octopuses, the following observations exist: When an octopus hook near the seabed is in a position with the hook portion raised, the octopus may not be able to hook itself onto the hook portion because it is holding the counterweight from below its main body. Therefore, when an octopus hook near the seabed is in a position with its rear (the side with the hook portion) lowered, the octopus is more likely to cover the hook, including the hook portion, making it easier to hook the octopus onto the hook portion.

[0004] A simple solution for lowering the octopus hook's rear end near the seabed is to install a weighted additional component at the rear of the main body. For example, consider installing a plate-like sheet, as described in Non-Patent Document 1, or an end cap-like component at the base of the hook at the rear of the main body. By installing such a weighted component, a "tail-lowering" posture can be easily achieved in the sea.

[0005] However, there are unsatisfactory aspects to using this additional component. Firstly, regarding functionality, the octopus hook's sinking speed decreases due to seawater resistance as the sheet sinks. Additionally, the resistance to seawater causes the octopus hook to drift in unwanted directions, leading to tangling with other anglers' lines. Furthermore, it increases the likelihood of the sheet tangling with the angler's own line. Next, regarding manufacturing, the increased number of parts leads to higher material costs, and the increased delivery time and instances of non-compliance with inspection standards during assembly increase assembly costs.

[0006] [Existing Technical Documents]

[0007] [Non-patent literature]

[0008] Non-Patent Document 1: Globeride Co., Ltd., Japan, "Comfort Boat Octopus Hook SS", Internet

[0009] <https: / / www.daiwa.com / jp / fishing / item / terminal_tackle / fune_te / kaiteki_fune_takoegiSS / index.html> Summary of the Invention

[0010] [The technical problem that the invention aims to solve]

[0011] Therefore, the technical problem of the present invention is to provide a lure that can descend to its rear end near the bottom of the water using only basic structural components (e.g., main body and counterweight).

[0012] [Technical solutions used to solve technical problems]

[0013] The present invention is a lure having a main body and a counterweight, wherein the main body extends in a front-rear direction; the counterweight protrudes downward at the lower front part of the main body, is integrally mounted with the main body, and is made of a material with a greater specific gravity than the main body, and the counterweight has a first grounding point and a center of gravity located at a position rearward of the first grounding point.

[0014] According to this structure, by setting the center of gravity of the counterweight part to a position further back than the first grounding point, the rear of the lure can sink to the bottom.

[0015] Alternatively, it can also have a hook portion installed at the rear of the main body portion, the hook portion having a second grounding point.

[0016] According to this structure, the rear of the lure can sink to the bottom through the second grounding point of the hook.

[0017] Alternatively, the artificial bait can be configured to be grounded at two points, through the first grounding point and the second grounding point.

[0018] According to this structure, the bottoming state is stable due to the two-point grounding.

[0019] Alternatively, it can also have a line loop installed at the front of the main body and connected to the fishing line.

[0020] Based on this structure, fishing lines can be easily connected.

[0021] Alternatively, the center of gravity can be located in front of the buoyancy center of the lure.

[0022] This structure prevents the front of the lure from rising in the water. Furthermore, because the rear of the lure tends to float to a certain extent, it is easier for the angler to move the lure. Additionally, the reduced moment of inertia in the water, corresponding to its tendency to float, further facilitates lure movement.

[0023] Alternatively, the rotational torque generated along an axis passing through the first grounding point and extending in the width direction of the main body can be the difference between a first rotational torque and a second rotational torque, wherein the first rotational torque is a torque generated in the direction in which the rear part of the main body sinks due to gravity; and the second rotational torque is a torque generated in the direction in which the rear part of the main body floats due to buoyancy, and the counterweight is formed in such a way that the first rotational torque is greater than the second rotational torque.

[0024] According to this structure, by forming a counterweight with a first rotational torque greater than a second rotational torque, the "tail descent" posture can be reliably achieved.

[0025] Alternatively, the relationship between the first rotational torque and the second rotational torque can be as follows:

[0026] l1mgcosθ1-l2ρVgcosθ2>0

[0027] Wherein, l1mgcosθ1 is the first rotational torque, l2ρVgcosθ2 is the second rotational torque, l1 is the length of the line segment connecting the first grounding point and the center of gravity of the entire lure, m is the mass of the entire lure, g is the acceleration due to gravity, θ1 is the angle formed by the line connecting the first grounding point and the center of gravity of the entire octopus hook relative to the bottom of the water, l2 is the length of the line segment connecting the first grounding point and the center of buoyancy of the entire lure, ρ is the density of the water at the location where the lure is used, V is the volume of the entire lure, and θ2 is the angle formed by the line connecting the first grounding point and the center of buoyancy of the entire octopus hook relative to the bottom of the water.

[0028] Based on this structure and the relationship of the formula, the "tail descent" posture can be reliably achieved.

[0029] Alternatively, the main body may have a light-transmitting portion and a cavity disposed therein. The lure may also have a first spring and a swinging portion, wherein the first spring is disposed within the cavity; the swinging portion is disposed within the cavity so as to swing relative to the main body in a manner facing the light-transmitting portion, and the first spring has one end connected to the main body and the other end connected to the swinging portion.

[0030] According to this structure, the oscillating part that swings within the cavity can make the lure noticeable to prey creatures such as octopuses.

[0031] Alternatively, it can also include a second spring disposed within the cavity, the second spring having one end connected to the main body and the other end connected to the swinging part.

[0032] According to this structure, the first and second springs are connected to the swinging part, making it easy to achieve the swinging state.

[0033] Alternatively, the swinging part may have a through hole extending through the thickness direction of the swinging part, and the main body may have a limiting part, which is inserted into the through hole in a manner that limits the swinging range of the swinging part.

[0034] According to this structure, the swing state can be appropriately limited by the combination of through holes and limiting parts.

[0035] [Invention Effects]

[0036] According to the present invention, by setting the center of gravity of the counterweight at a position further rear than the first contact point, the rear of the lure can be made to sink to the bottom. Therefore, the rear can be lowered near the seabed using only basic structural components (e.g., the main body and the counterweight). Attached Figure Description

[0037] Figure 1 This is a perspective view of an octopus hook used as a lure, as described in one embodiment of the present invention, viewed from the front and above.

[0038] Figure 2 This is a schematic side view showing the octopus hook in a horizontal position, i.e., submerged in water.

[0039] Figure 3 This indicates that the octopus hook is in Figure 2 Enlarged side view of the main part of the relationship between the front grounding point, center of gravity and center of buoyancy in the posture.

[0040] Figure 4 The diagram shows the shape of the counterweight in a side view on the upper layer and a bottom view on the lower layer, where (a) represents this embodiment, (b) represents variation 1, and (c) represents variation 2.

[0041] Figure 5 This is an example of the internal structure of an octopus hook, shown as a perspective view from above, omitting the front part of the main body of the illustration.

[0042] [Explanation of reference numerals in the attached figures]

[0043] 1: Lure, octopus hook; 2: Main body; 22: Swinging part; 221: First spring; 222: Second spring; 223: Through hole; 24: Through part; 25: Cavity; 26: Restriction part; 3: Counterweight part; 4: Hook part; B: Bottom of the water, seabed; Ff: Buoyancy; Fg: Gravity; Lf: First grounding point, front grounding point; Lb: Second grounding point, rear grounding point; Pf: Center of buoyancy of the octopus hook as a whole; Pg: Center of gravity of the octopus hook as a whole. Detailed Implementation

[0044] Next, regarding the present invention, as an embodiment of the lure, an octopus hook 1 (hereinafter referred to as "octopus hook") for octopus fishing will be described as an example. Furthermore, the following front and back and top and bottom are... Figure 2 The diagram shows the front and back, and the top and bottom positions in the shown state (bottomed state). The left side of the diagram is considered the front, and the right side is considered the back. Additionally, as shown... Figure 2 As shown, the center is set at the position of 1 / 2 in the front-to-back direction when the octopus hook 1 touches the horizontal bottom B through both front and back parts, and the front and back are determined based on this.

[0045] The octopus hook 1 of this embodiment imitates the shape of a fish (small fish) and mainly has a main body 2, a counterweight 3, and a hook 4, all of which are integrated into one piece. These three parts are the basic structural components of the octopus hook 1. However, in cases where the hook 4 is, for example, detachable, it is sometimes not included in the basic structural components. Except for the counterweight 3, the octopus hook 1 of this embodiment is basically configured with the same structure as in the prior art.

[0046] The main body 2 is an elongated portion extending in the front-to-back direction from the front (corresponding to the head) to the rear (corresponding to the tail). The main body 2 is approximately spindle-shaped, tapering at both ends, and curves gently into an approximate letter S in the front-to-back direction when viewed from the side. The outer peripheral surface of the main body 2 is curved. The main body 2 can be formed from an opaque material. Alternatively, if the swinging part 22 and the like are housed in the internal cavity 25 as described below, the main body 2 can be formed from a transparent material. When formed from a transparent material, the entire main body 2 can be transparent, or it can have a light-transmitting portion 24 formed by partially making it transparent. In this embodiment, all components of the main body 2 except for the internal components such as the swinging part 22 are made of resin. However, this is not a limitation; for example, it can be made of wood or a metal with a lower specific gravity than the counterweight 3 (such as a light metal like aluminum).

[0047] At the front end of the main body 2, a ring-shaped line loop 21 is protrudingly mounted. The fishing line can pass through this line loop 21. The fishing line is connected to the fishing rod and the reel, and the angler can operate by pulling the octopus hook 1, etc., through the fishing line.

[0048] A cavity 25 (having space) can be formed inside the main body 2. For example... Figure 5As shown, within the cavity 25, for example, the swinging part 22 can be positioned facing the transparent part 24, wherein the swinging part 22 is able to swing back and forth supported by a first spring 221 and a second spring 222. The swinging part 22 can be made of a light-reflective sheet, such as a glossy metal plate. The first spring 221 has one end and another end; one end (left end in the diagram) is connected to the main body 2, and the other end (right end in the diagram) is connected to the swinging part 22. The second spring 222 has one end and another end; one end (right end in the diagram) is connected to the main body 2, and the other end (left end in the diagram) is connected to the swinging part 22. Alternatively, the second spring 222 may be omitted, and the swinging part 22 may be supported only by the first spring 221. Furthermore, the swinging part 22 has a through hole 223 extending in the thickness direction. In this embodiment, the through hole 223 is configured as an elongated oval hole located at the rear of the swinging part 22. Correspondingly, the main body 2 has a rod-shaped limiting portion 26 protruding into the cavity 25 and extending horizontally. The limiting portion 26 is inserted into the through hole 223 in a manner that limits the swing range of the swinging portion 22. The swinging portion 22 is limited by the limiting portion 26 abutting against the periphery of the through hole 223. In addition, in this embodiment, a plurality of balls 23 that can move within the cavity 25 of the main body 2 are provided in front of the swinging portion 22. At least the outer peripheral surface of the balls 23 is colored and faces the through portion 24. By swinging the octopus hook 1 by the angler, the swinging portion 22 can swing inside the octopus hook 1, or the balls 23 can move inside the octopus hook 1, thereby making the octopus notice the octopus hook 1. In addition, although not shown, clusters that mimic fins can also be mounted on the surface of the main body 2.

[0049] The counterweight 3 protrudes downwards from the lower front part of the main body 2 and is integrally mounted to the main body 2. A portion of the upper part of the counterweight 3 is embedded in the main body 2, thus integrating the counterweight 3 and the main body 2. After being inserted into the recess formed at the lower front part of the main body 2, the counterweight 3 is secured by a pin (…). Figure 5 (As shown) is fixed. The counterweight 3 may be fixed to the main body 2 or it may be detachable. The counterweight 3 is made of a material with a higher specific gravity than the main body 2. There are no particular restrictions on the material of the counterweight 3, as long as it is a substance with a specific gravity that allows the octopus hook 1 to sink relative to seawater. If it is a metal, examples include heavy metals such as lead and tungsten. Alternatively, it may be a composite material of resin, metal, or dissimilar metals. When using a composite material, it is preferable that the counterweight 3 has a uniform density, as this makes it easier to calculate the center of gravity. However, it is not limited to this, and the counterweight 3 may be made of different materials depending on the part (see reference). Figure 4(c) Alternatively, a resin layer can be used to cover the surface. The counterweight 3 has a front grounding point Lf, which serves as the first grounding point described later, and a center of gravity located at a position further rear of the front grounding point Lf.

[0050] The counterweight 3 in this embodiment is as follows: Figure 4 The shape is as shown in (a). When viewed from the side, the part of the counterweight 3 that protrudes from the main body 2 is roughly a rounded triangle, with the apex pointing towards the front of the counterweight 3. Furthermore, when viewed from below, it is shaped to be smaller at the rear and larger at the front in terms of width.

[0051] The counterweight 3 is located at one part of the main body 2. That is, the counterweight 3 is only located at the lower front part of the main body 2. In this embodiment, the main body 2 of the octopus hook 1, apart from the counterweight 3, does not have any part for adjusting the front-to-back weight balance. Therefore, it is advantageous because there is no room for dissatisfaction arising from using the aforementioned method of adding additional components. Furthermore, since no additional components are used, the overall mass of the octopus hook 1 is not increased. Moreover, by adopting this embodiment, there is no increase in material costs proportional to the mass. Nevertheless, the underwater posture of the octopus hook 1 can be guided to the desired posture. The reason why the counterweight 3 of this embodiment can make the octopus hook 1 in a "tail-down" posture will be described later.

[0052] The center of gravity of the counterweight 3 is located forward of the center of buoyancy Pf of the octopus hook 1 as a whole. By setting this relationship, the head (front) of the octopus hook 1 can be prevented from floating in the water. In addition, by making the buoyancy act at a position further back than the center of gravity of the counterweight 3, the rear of the octopus hook 1 is made to float more easily to a certain extent (assuming "tail descent"), thus making it easy for the angler to move the octopus hook 1. Furthermore, the degree of this movement can be controlled by adding a sheet or the like to the rear to generate water resistance. In addition, corresponding to the ease of floating, the moment of inertia in the water can be reduced, thus making it easier for the rear of the line swivel 21 to move.

[0053] The hook portion 4 is installed at the rear of the main body 2, extending rearward. The hook portion 4 is positioned such that the hook tip is upward and facing forward when the hook is in a bottom-sinking posture. In this embodiment, the hook portion 4 consists of three hooks, but the number of hooks can be varied. The top of the rod-shaped portion added below the hook portion 4 is the rear contact point Lb that contacts the seabed when sinking. Furthermore, the hook portion 4 can be detached from the main body 2, and can be sold without the main body 2 being attached to the hook portion 4.

[0054] Regarding the posture of the octopus hook 1 in water (sea) according to this embodiment, the description will show its state when it is submerged at the horizontal bottom (seabed) B. Figure 2 As shown, the octopus hook 1 sinks to the bottom B by contacting the bottom at both the front and rear points. Because it sinks at both points, the octopus hook 1 maintains a stable sinking state. The grounding point (shown as a black dot) on the counterweight 3 in this sinking state is designated as the front grounding point Lf, which is the first grounding point. The grounding point (shown as a black dot) on the main body 2 or hook 4 (hook 4 in this embodiment) in this sinking state is designated as the rear grounding point Lb, which is the second grounding point. When the octopus hook 1 sinks, the front grounding point Lf on the counterweight 3 is the first grounding point, followed by the rear grounding point Lb on the hook 4. Using the front grounding point Lf as a reference, a descending torque (which serves as the first rotational torque) is generated. Figure 3 The clockwise torque is greater than the upward torque, which is the second rotational torque. Figure 3 The counterweight 3 is formed by a counterclockwise torque in the middle, wherein the first rotational torque is the torque of the rear part of the octopus hook 1 that is closer to the bottom than the front ground point Lf due to gravity Fg, and the rising torque is the torque of the rear part that rises due to buoyancy Ff.

[0055] That is, the rotational torque generated along the axis that passes through the front grounding point Lf and extends in the width direction of the main body 2 is the difference between the descending torque and the ascending torque, and the counterweight 3 is formed in such a way that the descending torque is greater than the ascending torque, wherein the descending torque is the torque generated in the direction in which the rear part of the main body 2 sinks due to gravity, and the ascending torque is the torque generated in the direction in which the rear part of the main body 2 floats due to buoyancy.

[0056] Specifically, the relationship between the descending torque and the ascending torque is as follows.

[0057] l1mgcosθ1-l2ρVgcosθ2>0

[0058] Where, l1mgcosθ1 is the descending torque (first rotational torque), l2ρVgcosθ2 is the ascending torque (second rotational torque), l1 is the length of the line segment connecting the first grounding point Lf and the center of gravity Pg of the entire lure, m is the mass of the octopus hook 1, g is the acceleration due to gravity, and θ1 is the angle between the line connecting the front grounding point Lf and the center of gravity Pg of the entire octopus hook 1 and the acute angle relative to the seabed B (refer to...). Figure 3 ), l2 is the length of the line segment connecting the first grounding point Lf and the buoyancy center Pf of the entire octopus hook 1, ρ is the density of the water (seawater) at the location where the octopus hook 1 is used (assumed value 1.025), V is the volume of the entire octopus hook 1, θ2 is the angle of the acute angle formed by the line connecting the front grounding point Lf and the buoyancy center Pf of the entire octopus hook 1 with respect to the bottom (refer to the angle between the two points). Figure 3 ).

[0059] Regarding the center of gravity Pg and center of buoyancy Pf in the aforementioned relationship, they are set as the center of gravity Pg and center of buoyancy Pf of the octopus hook 1 as a whole (the integral constituent parts). However, to simplify the calculation, the mass and volume of structural components that are unlikely to have a serious impact can be ignored, or the judgment can be made by evaluating the magnitude of the rotational torque brought by each component based on the calculation of the center of gravity and center of buoyancy of each component separately.

[0060] Typically, the specific gravity of the counterweight 3 is greater than that of the main body 2. Furthermore, the buoyancy generated by the main body 2 is greater than that generated by the counterweight 3. Additionally, the total mass of the octopus hook 1 in this embodiment is 35g, of which the mass of the counterweight 3 is 23g. That is, the counterweight 3 accounts for a large portion of the mass of the octopus hook 1 (2 / 3 in this embodiment). In such a typical octopus hook 1, in a sinking state ( Figure 2 Under these conditions, as long as the center of gravity of the counterweight 3 is located behind the front grounding point Lf (more specifically, the perpendicular line through the front grounding point Lf), the "tail descent" posture can be achieved. Therefore, the detailed (rigorous) design based on the aforementioned calculation formula can be omitted, and the octopus hook 1 can be formed simply by designing the counterweight 3. That is, the condition that the center of gravity of the counterweight 3 is located behind the front grounding point Lf can be used as a simplified design condition. In this case, the rear grounding point LB can also be disregarded.

[0061] Furthermore, this description addresses the case where the octopus hook 1 sinks to a horizontal bottom (seabed) B, but the same principle applies even to a sloping bottom B. In this case, using the sloping bottom B as a reference, it is possible to prevent the rear of the octopus hook 1 from rising from the bottom B.

[0062] As described above, in the octopus hook 1 of this embodiment, without using additional parts, the rear part can be lowered near the seabed using only the basic structural components (main body 2, counterweight 3, and hook 4 (sometimes without hook 4)). Therefore, it does not produce unsatisfactory aspects in terms of functionality and manufacturing as with methods that use additional parts.

[0063] The above describes one embodiment of the present invention, but the present invention is not limited to the described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0064] For example, in the described embodiment, an octopus hook 1 for octopus fishing was used as an example of a lure, but any lure that contacts the bottom can be used to target other organisms. A preferred example of other organisms is aquatic creatures such as flounder, which primarily inhabit the area near the bottom (seabed). For target organisms other than octopuses, by setting the lure (octopus hook) 1 in a "tail-down" posture, for example, it can be set so that it appears larger from the perspective of the target organism above the lure (octopus hook) 1 than in a posture other than a "tail-down" posture (such as a roughly vertical posture), thus expecting to evoke the target organism to bite the lure (octopus hook) 1. Furthermore, the octopus hook 1 was described in the description of its use in the sea, but it can also be widely used in waters where octopuses may live, such as saltwater lakes and brackish water lakes. Moreover, it can also be used in freshwater when the target organism is an aquatic creature other than an octopus. Furthermore, the shapes of the main body 2, the counterweight 3, and the hook 4, which are the basic structural components of the octopus hook 1, are not limited to those described in the embodiment. Various modifications can be made as long as the shape corresponds to the purpose of catching octopuses or other target creatures. In addition, it can also be used in conjunction with other lures such as worms.

[0065] Furthermore, although the main body 2 has the same form as the prior art, the position of the center of gravity Pg and the center of buoyancy Pf of the octopus hook 1 can be adjusted by changing the shape of the main body 2 itself or by changing the structure of the counterweight 3.

[0066] In addition, regarding counterweight 3, in Figure 4 (b) and Figure 4 (c) illustrates structures other than those described in the embodiment. As a variation 1... Figure 4 The width of the counterweight 3 shown in (b) when viewed from below is related to the dimensions of the embodiment described above. Figure 4 Conversely to (a)), that is, when viewed from below, it is shaped such that the width dimension is larger at the rear and smaller at the front. In this structure, corresponding to the increased width dimension at the rear, it is easier to position the center of gravity Pg of the counterweight 3 at the rear. In addition, as a variation 2, Figure 4 The counterweight 3 shown in (c) is a structure in which the rear portion 31 and the front portion 32 are integrated. The rear portion 31 is where a material with a relatively high specific gravity is disposed at the rear of the counterweight 3 (the portion indicated by the dotted symbol), and the front portion 32 is where a material with a relatively low specific gravity is disposed at the front of the counterweight 3. In this structure, because the material with a high specific gravity is located at the rear, it is easier to position the center of gravity of the counterweight 3 itself at the rear.

[0067] Furthermore, in the aforementioned embodiment, the angles θ1 and θ2 relative to the center of gravity Pg and the center of buoyancy Pf of the seabed B are as follows: Figure 3 The evaluation was performed using the acute angle side as shown, but it can also be performed using the obtuse angle side. However, when evaluating using the obtuse angle side, the downward torque based on gravity and the upward torque based on buoyancy are opposite in sign.

[0068] Furthermore, examples in the prior art negatively illustrate the use of sheets as counterweights. However, even with the octopus hook 1 according to the present invention, the sheet can be configured not for adjusting the weight balance before and after, but for inducing changes in the movement of the octopus hook 1 as it descends in water.

Claims

1. A lure characterized by comprising: a main body portion and a weight portion, the main body portion extends in a front-rear direction, the weight portion protrudes downward at a lower portion of the main body portion in front, is integrally installed with the main body portion, and is made of a material having a larger specific gravity than the main body portion, the weight portion has a first grounding point and a center of gravity provided at a position further rearward than the first grounding point, a hook portion is further provided which is installed at a rear portion of the main body portion, the hook portion has a second grounding point, the lure is configured to be grounded at two points by the first grounding point and the second grounding point.

2. The lure according to claim 1, characterized by further comprising a line ring which is installed at a front portion of the main body portion and to which a fishing line is connected.

3. The lure according to claim 1 or 2, characterized in that the center of gravity is located at a position further forward than a center of buoyancy of the lure.

4. The lure according to claim 1 or 2, characterized in that a rotational moment generated in an axis extending through the first grounding point and in a width direction of the main body portion is a difference between a first rotational moment and a second rotational moment, the weight portion is formed in such a manner that the first rotational moment is larger than the second rotational moment, the first rotational moment is a moment generated in a direction in which a rear portion of the main body portion sinks due to gravity, and the second rotational moment is a moment generated in a direction in which the rear portion of the main body portion floats up due to buoyancy.

5. The lure according to claim 4, characterized in that a relationship between the first rotational moment and the second rotational moment is a relationship of the following expression: l lmgcosθl - l2pVgcosθ2 > 0 where l lmgcosθl is the first rotational moment, l2pVgcosθ2 is the second rotational moment, l l is a length of a line segment connecting the first grounding point and a center of gravity of the entire lure, m is a mass of the entire lure, g is an acceleration of gravity, θl is an angle formed by a line connecting the first grounding point and the center of gravity of the entire lure with respect to a water bottom, l2 is a length of a line segment connecting the first grounding point and a center of buoyancy of the entire lure, p is a density of water at a use site of the lure, V is a volume of the entire lure, and θ2 is an angle formed by a line connecting the first grounding point and the center of buoyancy of the entire lure with respect to the water bottom.

6. The lure according to claim 1 or 2, characterized in that the main body portion has a light-transmitting portion through which light can be transmitted to an inside, and a cavity provided inside, the lure further comprises a first spring and a swing portion, the first spring is provided inside the cavity, the swing portion is swingably provided inside the cavity in such a manner as to face the light-transmitting portion, and the first spring has one end connected to the main body portion and the other end connected to the swing portion.

7. The lure according to claim 6, characterized by further comprising a second spring provided inside the cavity, the second spring has one end connected to the main body portion and the other end connected to the swing portion.

8. The lure according to claim 6, characterized in that ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The swing portion has a through-hole that penetrates in a thickness direction of the swing portion, The main body portion has a restriction portion that is inserted into the through-hole in a manner of restricting a swing range of the swing portion.

9. The artificial bait according to claim 7, wherein The swing portion has a through-hole that penetrates in a thickness direction of the swing portion, The main body portion has a restriction portion that is inserted into the through-hole in a manner of restricting a swing range of the swing portion.

Images