CN115735865A

CN115735865A - Artificial bait

Info

Publication number: CN115735865A
Application number: CN202210998366.7A
Authority: CN
Inventors: 中道理介; 北山刚史
Original assignee: Shimano Inc
Current assignee: Shimano Inc
Priority date: 2021-09-02
Filing date: 2022-08-19
Publication date: 2023-03-07
Also published as: JP2023036343A; TW202315520A; KR20230034130A

Abstract

The invention provides a kind of artificial bait. 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 section (3) protrudes downward at the lower front portion of the main body section (2), is attached integrally with the main body section (2), and is made of a material having a higher specific gravity than the main body section (2), and the weight section (3) has a first grounding point (Lf) and a center of gravity provided at a position rearward of the first grounding point (Lf). Thus, the lure capable of lowering the rear part near the water bottom only by the basic structural members (for example, the main body part and the weight part) is provided.

Description

Artificial bait

Technical Field

The present invention relates to lure, for example, an octopus-fishing hook (bait wood) as a lure used in octopus fishing.

Background

Conventionally, as described in non-patent document 1, an octopus hook for fishing octopus (hereinafter, also simply referred to as "octopus hook") is used. The octopus hook described in non-patent document 1 is provided with a weight portion at a lower portion in front of an elongated body portion, and a hook portion for hooking an octopus is provided at a rear end of the body portion. A fishing line connected with the fishing rod is installed at the front end of the main body.

Based on octopus habits, the following insights exist: when the octopus hook near the sea bottom is in a posture in which the hook portion is lifted upward, the octopus may not be hooked to the hook portion because the octopus embraces the weight portion below the main body portion. From this finding, it is found that when the octopus hook near the sea bottom is in a posture in which the rear portion (the side having the hook portion) is lowered, the octopus hook including the hook portion is more easily covered by the octopus, and as a result, the octopus is easily hooked on the hook portion.

A simple solution for lowering the rear portion of the octopus hook near the sea bottom is to mount an additional member having a weight on the rear portion of the main body. For example, it is conceivable to attach a plate-like sheet (blade) as described in non-patent document 1 and a cap-like member located at the base end of the hook portion to the rear portion of the main body. By mounting such a heavy member, the "tail-down" attitude can be easily achieved in the sea.

However, the method using this additional member is unsatisfactory. First, regarding the function, the sinking speed of the octopus hook is reduced because the sheet is subjected to the resistance of seawater when sinking. In addition, the sheet is subjected to resistance from seawater, and the octopus hook flows in a direction not intended by the fisherman, thereby causing entanglement (entanglement with a fishing line of another fisherman). In addition, the number of the sheets is increased, and the sheets are wound around the fishing line of the fisherman. Next, in the manufacture of the octopus hook, the material cost increases due to an increase in the number of parts, and the assembly cost increases due to an increase in the lead time during assembly or an increase in the case where the inspection standard is not met.

[ Prior art documents ]

[ non-patent document ]

Non-patent document 1: "comfortable Octopus fishhook SS", globiridede K.K., japan, and network

<https://www.daiwa.com/jp/fishing/item/terminal_tackle/fune_te/kaiteki_fune_takoegiSS/index.html>

Disclosure of Invention

[ problem to be solved by the invention ]

Accordingly, an object of the present invention is to provide a lure capable of lowering the rear portion near the water bottom only by the basic structural members (e.g., main body portion, weight portion).

[ solution for solving problems ]

The present invention is a lure having a main body portion and a weight portion, wherein the main body portion extends in a front-rear direction; the weight portion is integrally attached to the main body portion so as to protrude downward at a lower front portion of the main body portion, and is made of a material having a higher specific gravity than the main body portion.

According to this configuration, the center of gravity of the weight portion is set to a position rearward of the first grounding point, whereby the rear portion of the lure can be sunk.

In addition, it may be: there is also a hook mounted to the rear of the body portion, the hook having a second ground point.

According to this configuration, the sinking of the rear portion of the lure can be performed by the second grounding point provided to the hook portion.

In addition, it may be: the lure is configured to be grounded at two points through the first ground point and the second ground point.

According to this structure, the two points are grounded, so that the bottom-sinking state is stable.

In addition, it may be: the fishing device further comprises a wire loop which is mounted on the front part of the main body and is connected with the fishing wire.

According to this structure, the fishing line can be easily connected.

In addition, it may be: the center of gravity is located forward of the center of buoyancy of the lure.

According to this configuration, the front portion of the lure can be inhibited from floating up in water. In addition, since the rear portion of the lure is easily floated to some extent, the lure is easily moved by the manipulation of the fisherman. In addition, the moment of inertia in water can be reduced corresponding to the ease of floating, and therefore, the lure is easily activated.

In addition, it may be: a rotational moment generated along an axis that passes through the first ground point and extends in the width direction of the main body portion is a difference between a first rotational moment generated in a direction in which the rear portion of the main body portion sinks due to gravity and a second rotational moment; the second rotation moment is a moment generated in a direction in which the rear portion of the body portion floats up due to buoyancy, and the weight portion is formed in such a manner that the first rotation moment is greater than the second rotation moment.

According to this configuration, the counterweight portion is formed so that the first rotational moment is larger than the second rotational moment, whereby the "tail-down" posture can be reliably realized.

In addition, the relationship between the first rotational moment and the second rotational moment may be as follows:

l ₁ mgcosθ ₁ －l ₂ ρVgcosθ ₂ ＞0

wherein l ₁ mgcosθ ₁ For said first rotational moment,/ ₂ ρVgcosθ ₂ For said second rotational moment,/ ₁ A length of a line segment connecting the first grounding point and the center of gravity of the whole lure, m is a mass of the whole lure, g is a gravitational acceleration, and theta ₁ Angle formed by line connecting the first grounding point and integral gravity center of the octopus hook relative to water bottom, l ₂ A length of a line segment connecting the first grounding point and the center of buoyancy of the whole lure, ρ is a density of water at a site where the lure is used, V is a volume of the whole lure, and θ ₂ The angle formed by a line connecting the first grounding point and the integral floating center of the octopus hook relative to the water bottom.

According to this configuration, the posture of "tail down" can be reliably realized according to the relationship of the formula.

In addition, it may be: the main body part is provided with a transmission part which can transmit light to the inside and a cavity arranged in the inside, and the artificial bait is also provided with a first spring and a swinging part, wherein the first spring is arranged in the cavity; the swinging portion is provided in the cavity so as to be swingable with respect to the main body portion so as to face the transmission portion, and the first spring has one end connected to the main body portion and the other end connected to the swinging portion.

According to this configuration, by the swinging part swinging within the cavity, the living creature such as octopus can be made to notice the lure.

In addition, it may be: the second spring has one end connected to the main body portion and the other end connected to the swing portion.

According to this structure, the first spring and the second spring are connected to the swing portion, and the swing state is easily achieved.

In addition, it may be: the swing portion has a through hole penetrating in a thickness direction of the swing portion, and the main body portion has a regulating portion inserted through the through hole so as to regulate a swing range of the swing portion.

According to this configuration, the swing state can be appropriately restricted by the combination of the through hole and the restricting portion.

[ Effect of the invention ]

According to the present invention, the center of gravity of the weight portion is set to a position rearward of the first grounding point, whereby the rear portion of the lure can be sunk. Therefore, the rear portion can be lowered near the seabed only by the basic structural members (e.g., the main body portion, the counterweight portion).

Drawings

Fig. 1 is a perspective view of an octopus-fishing octopus hook as an artificial bait according to an embodiment of the present invention, as viewed from the front upper side.

Fig. 2 is a side view schematically showing a state in which the octopus hook is horizontal, that is, submerged in the water bottom.

Fig. 3 is an enlarged side view of a main part showing a relationship among a front grounding point, a center of gravity, and a center of buoyancy of the octopus hook in the posture of fig. 2.

Fig. 4 is a view showing the shape of the weight portion in a side view on the upper layer and a bottom view on the lower layer, in which (a) shows the present embodiment, (b) shows modification 1, and (c) shows modification 2.

Fig. 5 is a perspective view showing an example of the internal structure of the octopus hook, with the front side portion of the main body omitted from illustration, as viewed from above.

[ description of reference numerals ]

1: artificial bait, octopus hook; 2: a main body portion; 22: a swing portion; 221: a first spring; 222: a second spring; 223: a through hole; 24: a transmission section; 25: a cavity; 26: a restricting section; 3: a counterweight portion; 4: a hook portion; b: water bottom, sea floor; ff: buoyancy; fg: gravity; lf: a first ground point, a forward ground point; lb: a second ground point, a rear ground point; pf: the integral floating core of the octopus hook; pg: the overall center of gravity of the octopus hook.

Detailed Description

Next, the present invention will be described taking an octopus hook 1 for fishing octopus (hereinafter, simply referred to as "octopus hook") as an example of an embodiment of the artificial bait. Note that the front-back and up-down below are the front-back and up-down in the state shown in fig. 2 (the bottomed state). The left side is shown as the front and the right side is shown as the rear. As shown in fig. 2, the front and rear are determined based on the position of the octopus hook 1 at 1/2 of the position in the front-rear direction when the front and rear portions touch the horizontal water bottom B.

The octopus hook 1 of the present embodiment is shaped to resemble a fish (small fish), and mainly includes a main body portion 2, a weight portion 3, and a hook portion 4, and each portion is integrated. The three components are basic structural components of the octopus hook 1. However, when the hook portion 4 is of a detachable type, for example, the hook portion 4 may not be included in the basic component. The octopus hook 1 of the present embodiment is basically configured in the same manner as the conventional art except for the weight portion 3.

The main body 2 is formed into an elongated shape extending in the front-rear direction from a front portion corresponding to the head to a rear portion corresponding to the tail. The main body 2 has a substantially spindle shape with front and rear end portions thereof tightened, and is gently curved in the front-rear direction in a side view to substantially form a letter S. The outer peripheral surface of the body 2 is a curved surface. The main body 2 can be formed of an opaque material. In addition, when the swing portion 22 and the like are provided in the internal cavity 25 as described below, the main body portion 2 can be formed of a transparent material. When formed of a transparent material, the main body 2 may be transparent as a whole, or may be partially transparent to form the light-permeable transmission section 24. The main body 2 of the present embodiment is made of resin except for the built-in components such as the swing portion 22. However, the present invention is not limited to this, and may be made of wood or a metal having a lower specific gravity than the weight part 3 (for example, a light metal such as aluminum).

An annular wire loop 21 is attached to the distal end of the body 2 in a protruding manner. A fishing line can pass through the wire loop 21. The fishing line is associated with a fishing rod and a line winding, and the fisherman can pull the octopus hook 1 or the like through the fishing line.

A cavity 25 (having a space) can be formed inside the body portion 2. As shown in fig. 5, in the cavity 25, for example, the swing portion 22 can be provided facing the transmission portion 24, and the swing portion 22 can swing by being supported by the first spring 221 and the second spring 222 in the front-rear direction. As the swing portion 22, a sheet that reflects light, for example, a glossy metal plate can be used. The first spring 221 has one end (left end in the drawing) connected to the main body 2 and the other end (right end in the drawing) connected to the swing portion 22. The second spring 222 has one end (right end in the figure) connected to the main body 2 and the other end (left end in the figure) connected to the swing portion 22. Further, the second spring 222 is not provided, and the swing portion 22 may be supported only by the first spring 221. The swing portion 22 has a through hole 223 penetrating in the thickness direction. In the present embodiment, the through hole 223 is configured as a vertically long and oval hole provided in the rear portion of the swing portion 22. In correspondence with this, the main body 2 has a rod-shaped restriction portion 26 protruding into the cavity 25 and extending in the horizontal direction. The restricting portion 26 is inserted through the through hole 223 so as to restrict the swing range of the swing portion 22. The restricting portion 26 abuts on the peripheral edge of the through hole 223 to restrict the swing of the swing portion 22. In the present embodiment, a plurality of balls 23 that are movable in a cavity 25 of the main body 2 are provided in front of the swing portion 22. The balls 23 are colored at least on the outer peripheral surface thereof, and face the transmission portion 24. By swinging the octopus hook 1 by an operation of a fisherman, the swing portion 22 can be swung inside the octopus hook 1, or the ball 23 can be moved inside the octopus hook 1, whereby the octopus can be made to notice the octopus hook 1. Although not shown, clusters imitating fins may be attached to the surface of the main body 2.

The weight 3 protrudes downward from the lower front portion of the body 2, and is attached to the body 2 so as to be integral with the body 2. The weight portion 3 and the main body portion 2 are integrated by a portion of the upper portion of the weight portion 3 being embedded in the main body portion 2. The weight 3 is inserted into a recess formed in the lower front portion of the main body 2 and then fixed by a pin (shown in fig. 5). The weight 3 may be detachable or not detachable from the main body 2. The weight portion 3 is made of a material having a higher specific gravity than the main body portion 2. The material of the weight 3 is not particularly limited as long as it is a material having a specific gravity capable of sinking the entire octopus hook 1 to seawater, and if it is a metal, a heavy metal such as lead or tungsten can be exemplified. Further, the resin may be a composite material of a resin, a metal, and a dissimilar metal. In the case of using the composite material, it is preferable that the entire weight portion 3 has a uniform density because the center of gravity position can be easily calculated in this case, but the present invention is not limited thereto, and the weight portion 3 may be formed of different materials depending on the location (see fig. 4 (c)). In addition, the surface may be covered with a resin layer. The counterweight 3 has a front grounding point Lf as a first grounding point to be described later and a center of gravity provided at a position rearward of the front grounding point Lf.

The weight portion 3 of the present embodiment has a shape as shown in fig. 4 (a). The shape of the portion of the weight 3 protruding from the body 2 is substantially triangular with rounded corners in side view, and the apex portion is biased forward of the weight 3. In addition, the rear side is small and the front side is large in the width dimension in a bottom view.

The weight 3 is provided at one location of the main body 2. That is, the weight 3 is provided only at the front lower portion of the main body 2. The main body 2 of the octopus hook 1 of the present embodiment is not provided with a portion for the purpose of adjusting the weight balance before and after the adjustment, except for the weight portion 3. Therefore, there is no room for the use of the above-described method of adding a component to be unsatisfactory, which is advantageous. Further, since no additional member is used, the mass of the entire octopus hook 1 can be prevented from being increased. Further, according to the present embodiment, the material cost does not increase in proportion to the mass. Nevertheless, the underwater posture of the octopus hook 1 can be guided to a desired posture. The reason why the tail of the octopus hook 1 can be lowered by the weight 3 of the present embodiment will be described later.

The center of gravity of the weight 3 is located forward of the center of buoyancy Pf of the entire octopus hook 1. With this relationship, the head (front portion) of the octopus hook 1 can be prevented from floating up in water. Further, since the rear portion of the octopus hook 1 is easily floated to some extent (assuming "tail down") by being able to cause buoyancy to act on the rear side of the center of gravity of the weight portion 3, the octopus hook 1 is easily moved by the angler's operation. Further, the degree of this activity can be controlled by the resistance to water generation by the rear attachment sheet or the like. Further, since the moment of inertia in water can be reduced in accordance with the ease of floating, the rear portion of the wire loop 21 can be moved easily.

The hook 4 is attached to the rear portion of the body 2 so as to extend rearward. The hook 4 is provided so that the tip of the fish hook is positioned above and faces forward in the bottom-sinking posture. The hook portion 4 of the present embodiment is constituted by three fishhooks, but the number of fishhooks can be variously changed. The tip of the rod-like portion added below the fishhook portion of the hook portion 4 is a rear grounding point Lb that contacts the sea bottom at the time of bottoming. The hook portion 4 is detachable from the main body 2, and the main body 2 may not be attached to the hook portion 4 at the time of sale.

The attitude of the octopus hook 1 of the present embodiment in water (sea) will be described with reference to a state of sinking to a horizontal water bottom (sea bottom) B. As shown in fig. 2, the octopus hook 1 is sunk by contacting the water bottom B at two front and rear positions (two points). Since the bottom is sunk at two points, the sunk state of the octopus hook 1 is stable. The ground point (shown by a black dot) on the weight portion 3 in the case of such a sinking is set as a forward ground point Lf which is a first ground point, and the ground point (shown by a black dot) on the main body portion 2 or the hook portion 4 (the hook portion 4 in the present embodiment) in the case of such a sinking is set as a rearward ground point Lb which is a second ground point. When the octopus hook 1 sinks, first, the front grounding point Lf at the weight portion 3 is grounded, and then the rear grounding point Lb at the hook portion 4 is grounded. The weight portion 3 is formed such that a descending moment (a moment in the clockwise direction in fig. 3) as a first rotational moment, which is a moment in which a rear portion in a state of being sunk below a front grounding point Lf in the entire octopus hook 1 is descended by the gravity Fg, is larger than an ascending moment (a moment in the counterclockwise direction in fig. 3) as a second rotational moment, which is a moment in which the rear portion is ascended by the buoyancy Ff.

That is, the rotational moment generated along the axis line that passes through the front ground point Lf and extends in the width direction of the main body portion 2 is a difference between a descending moment generated in a direction in which the rear portion of the main body portion 2 is caused to sink due to gravity and an ascending moment generated in a direction in which the rear portion of the main body portion 2 is caused to float due to buoyancy, and the counterweight portion 3 is formed so that the descending moment is larger than the ascending moment.

Specifically, the relationship between the falling torque and the rising torque is as follows.

l ₁ mgcosθ ₁ －l ₂ ρVgcosθ ₂ ＞0

Wherein l ₁ mgcosθ ₁ For the lowering moment (first rotational moment), l ₂ ρVgcosθ ₂ For a lifting moment (second rotational moment) | ₁ A length of a line segment connecting the first grounding point Lf and the center of gravity Pg of the whole of the lure, m is a mass of the whole of the octopus hook 1, g is a gravitational acceleration, and θ ₁ An acute angle (see FIG. 3) formed by a line connecting the front grounding point Lf and the gravity center Pg of the whole octopus hook 1 with respect to the sea bottom B ₂ In order to make the length of a line segment connecting the first grounding point Lf and the center of buoyancy Pf of the whole artificial bait, ρ is the density of water (sea water) at the place of use of the octopus hook 1 (assumed value is 1.025), and V is the whole octopus hook 1Volume of (a), theta ₂ An acute angle formed by a line connecting the front ground point Lf and the center of buoyancy Pf of the entire octopus hook 1 with respect to the water bottom (see fig. 3).

The center of gravity Pg and the center of buoyancy Pf in the above relationship are defined as the center of gravity Pg and the center of buoyancy Pf of the entire octopus hook 1 (entire constituent member). However, in order to simplify the calculation, the mass and volume of a part of the structural members that are difficult to exert a serious influence may be ignored, or the weight center and the center of buoyancy of each structural member may be calculated separately, and the magnitude of the rotational moment exerted by each structural member may be evaluated to make a determination.

Generally, the specific gravity of the weight portion 3 is larger than that of the main body portion 2. Further, the buoyancy generated by the trunk portion 2 is larger than the buoyancy generated by the weight portion 3. The mass of the entire octopus hook 1 of the present embodiment is 35g, and the mass of the weight 3 is 23g. That is, the weight 3 accounts for most of the mass of the octopus hook 1 (2/3 in the present embodiment). In such a normal octopus hook 1, in the submerged state (fig. 2), if the center of gravity of the weight portion 3 itself is located rearward of the forward grounding point Lf (more specifically, a perpendicular line passing through the forward grounding point Lf), the "tail-down" posture can be achieved. Therefore, the jig hook 1 may be formed by designing only the weight portion 3 without a fine (strict) design based on the above calculation formula. That is, a condition that the center of gravity of the weight portion 3 is located rearward of the forward grounding point Lf can be set as a simple design condition. In this case, the rear ground point LB may not be considered.

Further, the case where the octopus hook 1 is sunk into the horizontal water bottom (sea bottom) B is explained here, but the same is also applicable even in the inclined water bottom B. In this case, the rear portion of the octopus hook 1 can be prevented from floating from the water bottom B with reference to the inclined water bottom B.

As described above, in the octopus hook 1 of the present embodiment, the rear portion can be lowered near the sea bottom only by the basic structural members (the main body portion 2, the weight portion 3, and the hook portion 4 (the hook portion 4 may not be included) without using an additional member. Therefore, dissatisfaction does not occur on the functional surface and the manufacturing surface as in the method using the additional member.

While the embodiment of the present invention has been described above, the present invention is not limited to the embodiment, and various modifications can be made without departing from the scope of the present invention.

For example, in the above embodiment, the octopus hook 1 for fishing octopus has been described as an example of the artificial bait, but the artificial bait may be an artificial bait using another living body as a capture object as long as the artificial bait contacting the water bottom is used. As a preferable example of the other living organisms, there may be mentioned aquatic organisms such as flounder which mainly live in the vicinity of the water bottom (sea bottom). By setting the lure (octopus hook) 1 to a posture of "tail-down" for a capturing object organism other than octopus, for example, a capturing object organism located above the lure (octopus hook) 1 can be made to look larger than a posture (a substantially vertical posture or the like) other than "tail-down", and an action of the capturing object organism biting the lure (octopus hook) 1 can be expected. In the above embodiment, the case where the octopus hook 1 is used in the sea has been described, but the present invention can be widely used in water areas where octopus may live, such as a salt water lake and a brackish water lake. In addition, the present invention can be used in fresh water even when the living body to be captured is an aquatic living body other than octopus. The shapes of the main body 2, the weight 3, and the hook 4, which are basic components of the octopus hook 1, are not limited to those of the above-described embodiments, and various modifications can be made as long as the shapes are suitable for the purpose of fishing a living body to be captured such as an octopus. In addition, the bait may be used integrally with other baits such as worms.

In the above embodiment, the main body 2 has the same configuration as the conventional configuration, but the positions of the center of gravity Pg and the center of buoyancy Pf of the entire octopus hook 1 may be adjusted by changing the shape of the main body 2 itself or changing the structure of the weight 3.

In addition, the counterweight 3 is illustrated in fig. 4 (b) and 4 (c) in addition to the above-described embodiments. The dimensional relationship of the width of the weight portion 3 when viewed from the bottom as shown in fig. 4 (b) of modification 1 is contrary to the above-described embodiment (fig. 4 (a)). That is, the rear side is large and the front side is small in the width dimension in a bottom view. In this configuration, the position of the center of gravity Pg of the weight 3 itself can be easily positioned rearward as the width dimension at the rear increases. In addition, the weight 3 shown in fig. 4 (c) of modification 2 is configured such that a rear portion 31 and a front portion 32 are integrated, the rear portion 31 being a portion (indicated by a dotted line) where a material having a relatively high specific gravity is disposed at the rear portion of the weight 3, and the front portion 32 being a portion where a material having a relatively low specific gravity is disposed at the front portion of the weight 3. In this configuration, since the material having a high specific gravity is located rearward, the center of gravity of the weight portion 3 itself is easily located rearward.

In the above embodiment, the angles θ 1 and θ 2 with respect to the center of gravity Pg and the center of buoyancy Pf of the sea bottom B are evaluated using the angle on the acute angle side as shown in fig. 3, but may be evaluated using the angle on the obtuse angle side. However, when the evaluation is performed using the obtuse angle side angle, the gravity-based falling moment and the buoyancy-based rising moment are opposite in sign to each other.

In addition, with regard to the example in the related art, a case where the sheet is used as a weight and functions has been explained negatively. However, even in the octopus hook 1 according to the present invention, the sheet may be provided for the purpose of changing the operation of the octopus hook 1 when it is lowered in water, without the purpose of adjusting the weight balance before and after the work.

Claims

1. A kind of artificial bait is characterized in that,

has a main body part and a weight part, wherein,

the main body portion extends in a front-rear direction;

the weight portion is integrally attached to the main body portion so as to protrude downward at a lower front portion of the main body portion, and is made of a material having a higher specific gravity than the main body portion,

the weight portion has a first grounding point and a center of gravity provided at a position rearward of the first grounding point.

2. The lure according to claim 1,

and a hook part mounted on the rear part of the main body part,

the hook portion has a second ground point.

3. The lure according to claim 2,

the lure is configured to be grounded at two points through the first ground point and the second ground point.

4. The lure according to any one of claims 1 to 3,

the fishing device further comprises a wire loop which is mounted on the front part of the main body part and is connected with the fishing line.

5. The lure according to any one of claims 1 to 4,

the center of gravity is located forward of the center of buoyancy of the lure.

6. The lure according to any one of claims 1 to 5,

a rotational moment generated along an axis that passes through the first ground point and extends in the width direction of the main body portion is a difference between a first rotational moment and a second rotational moment, the weight portion being formed in such a manner that the first rotational moment is greater than the second rotational moment, wherein the first rotational moment is a moment generated in a direction in which the rear portion of the main body portion sinks due to gravity; the second rotation moment is a moment generated in a direction in which the rear portion of the body portion floats due to buoyancy.

7. The lure according to claim 6,

the relationship between the first rotational moment and the second rotational moment is the following relationship:

l ₁ mgcosθ ₁ －l ₂ ρVgcosθ ₂ ＞0

8. The lure according to any one of claims 1 to 7,

the main body part is provided with a transmission part for transmitting light to the inside and a cavity arranged in the inside,

the lure further has a first spring and a swinging portion, wherein,

the first spring is disposed within the cavity;

the swinging portion is provided in the cavity so as to be swingable with respect to the main body portion so as to face the transmission portion,

the first spring has one end connected to the main body portion and the other end connected to the swing portion.

9. The lure according to claim 8,

there is also a second spring disposed within the cavity,

the second spring has one end connected to the main body portion and the other end connected to the swing portion.

10. The lure according to claim 8 or 9,

the swing portion has a through hole penetrating in a thickness direction of the swing portion,

the main body has a restricting portion inserted through the through hole so as to restrict a swing range of the swing portion.