Culture dish with coating function

Abstract

The culture dish with the coating function comprises a bottom plate, a plurality of culture grooves with upward openings are formed in the bottom plate, a cover is arranged on each culture groove, a containing cavity is formed in each cover, a plurality of balls are arranged in each containing cavity, and first through holes which are communicated with the containing cavities and allow the balls to pass through are formed in the bottoms of the covers. And the accommodating cavity is communicated with the culture tank through the ball passing hole. The invention provides a culture dish with a coating function, which can enable the coating work in the culture dish to be simple in operation and good in coating consistency, and the culture dish can be kept in a covering state in the coating process, so that the pollution of external microorganisms is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of culture dishes, in particular to a culture dish with a coating function. Background Art

[0002] A culture dish is a laboratory dish used for microbial or cell culture. It consists of a flat, disc-shaped bottom and a lid, and is generally made of glass or plastic. When using a culture dish for microbial culture, it is generally necessary to spread the microorganisms evenly first to obtain better culture results. If the culture medium used is a liquid culture medium, the liquid culture medium can be made uniform by shaking the culture dish. If the culture medium used is a solid culture medium, it is necessary to use a coating rod to manually spread the microorganisms on the solid culture medium evenly. However, manual coating is not only inefficient and has poor coating consistency, but the culture dish is open when manually coating with a coating rod, and there is a risk of external microbial contamination. Summary of the Invention

[0003] The present invention aims to solve one of the technical problems in the related art to at least a certain extent: to provide a culture dish with a coating function, which can make the coating work in the culture dish simple to operate, have good coating consistency, and the culture dish can remain in a covered state during the coating process, thereby reducing contamination by external microorganisms.

[0004] To this end, one object of the present invention is to provide a culture dish with a coating function, which includes a base plate, a plurality of culture grooves with upward openings on the base plate, and a lid on each culture groove. The lid has a receiving cavity inside, and a plurality of balls are provided in the receiving cavity. The bottom of the lid has a first through hole that is connected to the receiving cavity and allows the balls to pass through. The receiving cavity is connected to the culture groove through the ball hole. Each culture groove is provided with a culture medium and corresponding microorganisms to be cultured. The lid only needs to be closed on the groove of the culture groove. At this time, the balls can roll into the culture groove through the first through hole. By shaking the base plate in a horizontal direction, the balls are rolled in the culture groove, so that the microorganisms are evenly coated on the culture medium. Finally, the base plate and the lid are inverted. Under the action of gravity, the balls will return to the receiving cavity through the first through hole.

[0005] According to one embodiment of the present invention, the lid comprises an upper cover and a lower cover, the upper cover and the lower cover together forming a receiving cavity, and the upper cover and the lower cover are slidably engaged along the thickness direction, the first through hole is arranged on the lower cover, and a hole-blocking member is provided on the upper cover at a position corresponding to the first through hole, and the upper cover drives the hole-blocking member upward or downward so that the distance between the hole-blocking member and the first through hole is greater than or equal to the diameter of the ball or less than the diameter of the ball. Through relative movement between the upper cover and the lower cover, when the lid is closed on the culture tank, the distance between the hole-blocking member and the first through hole is greater than or equal to the diameter of the ball, so that shaking the bottom plate can cause the ball to roll from the first through hole into the culture tank, and the microorganisms are coated as the bottom plate shakes. Finally, when the ball falls back into the receiving cavity, the upper cover and the lower cover only need to move relative to each other so that the distance between the hole-blocking member and the first through hole is less than the diameter of the ball to prevent the ball from falling into the culture tank.

[0006] According to an example of the present invention, the lid further includes a bottom cover located below the lower cover, and a second through hole is provided on the bottom cover at a position corresponding to the first through hole, the aperture of the second through hole matches that of the first through hole, and the bottom cover is detachably connected to the upper cover, and the bottom cover can be detached from the upper cover when the upper cover is away from the bottom plate. When the lid is closed on the culture tank, the balls can fall into the culture tank through the first through hole and the second through hole. When the balls complete coating the microorganisms in the culture tank and return to the accommodating cavity, the upper and lower covers in the lid can carry the balls away from the bottom plate, and the bottom cover detaches from the upper cover and maintains the position of covering the culture tank. The culture tank and the bottom cover continue to culture the microorganisms, while the upper cover, the lower cover and the balls are away from the culture tank, which not only reduces the interference with the culture tank during the culture process, but also allows the upper cover, the lower cover and the balls to be simultaneously disposed of once or cleaned and disinfected for subsequent recycling.

[0007] According to one example of the present invention, the outer wall of the bottom cover and the inner wall of the upper cover are slidably engaged, the friction between the bottom cover and the upper cover is greater than the weight of the bottom cover, and when the upper cover moves upward away from the bottom plate, the force exerted by the bottom plate on the bottom cover is greater than the friction between the bottom cover and the upper cover. The friction between the bottom cover and the upper cover allows the bottom cover to remain on the upper cover during movement of the lid, and when the lid is closed on the culture tank and the upper cover needs to be disengaged from the culture tank, the bottom cover can remain on the culture tank, maintaining its position covering the notch of the culture tank.

[0008] According to one example of the present invention, the hole-blocking member is a columnar structure that matches the second through-hole. The upper end surface of the hole-blocking member has an insertion rod, and the upper cover has a slot located at a position corresponding to the insertion rod. The insertion rod and the slot are plugged into each other. When the upper cover drives the hole-blocking member downward into the second through-hole and moves upward, the insertion rod of the hole-blocking member disengages from the slot. The hole-blocking member not only blocks the ball bearing when the upper cover descends, but also allows the hole-blocking member to block the second through-hole by disengaging from the upper cover.

[0009] According to an example of the present invention, an annular flange extending toward the first through hole is provided on the second through hole, and the outer diameter of the hole blocking member matches the inner diameter of the annular flange.

[0010] According to an example of the present invention, a positioning ring is provided on the inner side wall of the upper cover, and the lower cover is made of an elastically deformable plastic material. The positioning ring can ensure that the bottom cover is more accurately positioned when moving axially within the upper cover.

[0011] According to an example of the present invention, the lower cover is provided with a guide slope for driving the balls in the accommodating cavity to roll toward the location of the first through hole. The guide slope enables the balls in the accommodating cavity to automatically roll toward the location of the first through hole under the action of their own gravity.

[0012] According to one embodiment of the present invention, the lower end surface of the bottom cover is tilted so that the balls in the culture tank roll toward the location of the first through hole when the bottom cover is inverted. After the balls in the culture tank are coated and the bottom plate is inverted, the balls in the culture tank can roll toward the location of the first through hole via the tilted lower end surface of the bottom cover and fall back into the receiving chamber.

[0013] According to an example of the present invention, the bottom plate is provided with four culture tanks, and the culture tanks are arranged at intervals along the horizontal direction.

[0014] The above technical solution has the following advantages or beneficial effects: First, the lid is closed on each culture tank of the base plate, and the balls in the receiving cavity can fall into the culture tank through the first through-hole. Shaking the base plate can drive the balls to roll in the culture tank to complete the coating of microorganisms on the culture medium. After the coating is completed, the base plate and the lid need only be inverted to allow the balls to return to the receiving cavity through the first through-hole. The lid is closed on the culture tank during the entire process, reducing the contamination of the environment in the culture tank by external microorganisms during the coating process, and achieving good coating effect and high efficiency. Second, the cover is composed of an upper cover and a lower cover that can move relative to or away from each other, and a hole-blocking member is provided on the upper cover. The upper cover drives the adjustment of the distance between the hole-blocking member and the first through hole. When the distance is large, the ball can pass through the first through hole. When the distance is small, the ball is confined in the accommodating cavity to prevent the ball from falling into the first through hole. Third, a bottom cover is added to the lid. The bottom cover can be left on the culture tank when the upper cover is detached from the bottom plate to keep the notch of the culture tank covered. In this way, after the ball bearing on the lid has finished coating the microorganisms on the culture medium, the upper cover, lower cover and ball bearing can be taken away. The bottom plate and bottom cover together with the microorganisms in the culture tank can be cultured subsequently, while the upper cover, lower cover and ball bearing can be arranged for disinfection and cleaning separately. Fourth, the hole-blocking member is detachably connected to the upper cover. When the ball completes coating the microorganisms in the culture tank and returns to the receiving chamber, the hole-blocking member can block the second through hole on the bottom cover. After the upper cover is detached from the bottom plate, the bottom cover and the hole-blocking member can cover the culture tank to complete the covering of the notch of the culture tank. Fifth, the guiding inclined surface on the lower cover and the lower end surface of the bottom cover are inclined so that the ball can better roll toward the location of the first through hole.

[0015] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an isometric view of the culture dish with coating function of the present invention.

[0017] Figure 2 It is a schematic diagram of the explosive disassembly of the culture dish with coating function of the present invention.

[0018] Figure 3 It is a top view of the culture dish with coating function of the present invention.

[0019] Figure 4 for Figure 3 Schematic cross-sectional view in the "AA" direction.

[0020] Figure 5 for Figure 4 A partial enlarged schematic diagram of the "B" area in the middle.

[0021] Figure 6 for Figure 5 Schematic diagram of the structure of the middle hole blocking member descending into the second through hole.

[0022] Figure 7 for Figure 6 Schematic diagram of the structure in which the middle upper cover moves upward and disengages from the hole blocking member.

[0023] Figure 8 for Figure 1 Schematic diagram of the explosive disassembly of the middle upper cover.

[0024] Figure 9 for Figure 8 Schematic diagram of the internal structure of the upper middle cover.

[0025] Figure 10 for Figure 9 A partial enlarged schematic diagram of the "C" area in the middle.

[0026] Among them, 1. bottom plate; 1.1. culture tank; 2. accommodating cavity; 3. ball bearing; 4. upper cover; 5. lower cover; 6. bottom cover; 7. first through hole; 8. second through hole; 9. hole blocking member; 10. insertion rod; 11. slot; 12. annular flange; 13. positioning ring; 14. guide slope; 15. culture medium; 16. protective sticker. DETAILED DESCRIPTION

[0027] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0028] The culture dish with coating function according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] The present invention provides a culture dish with a coating function, as shown in the figure, which includes a base plate 1, and the base plate 1 has multiple culture grooves 1.1 with openings facing upward. Each culture groove 1.1 is provided with a lid for covering the notch of the culture groove 1.1. The interior of the lid has a accommodating cavity 2, and a plurality of balls 3 are arranged in the accommodating cavity 2. The bottom of the lid has a first through hole 7 connected to the accommodating cavity 2. The aperture of the first through hole 7 is set to allow the balls 3 to pass through. The accommodating cavity 2 is connected to the culture groove 1.1 through the through hole. In this embodiment, a solid culture medium is provided in the culture tank 1.1, and microorganisms to be cultured are placed on the solid culture medium. When the lid is closed on the culture tank 1.1, the balls 3 in the accommodating chamber 2 fall into the culture tank 1.1 through the first through hole 7 under the action of their own gravity, or the bottom plate 1 is shaken horizontally to make the balls 3 in the accommodating chamber 2 fall into the culture tank 1.1; the balls 3 roll in the culture tank 1.1 to complete the uniform coating of the microorganisms, and finally the bottom plate 1 and the lid are inverted, and the coated balls 3 in the culture tank 1.1 fall back from the first through hole 7 into the accommodating chamber 2, and then the inverted bottom plate 1 is reset. At this time, the balls 3 remain stationary in the accommodating chamber 2, and the microorganisms in the culture tank can be cultured subsequently.

[0030] In the above embodiment, the diameter of the first through hole 7 matches the diameter of the ball 3. Specifically, the diameter of the first through hole 7 is larger than the diameter of the ball 7.

[0031] Preferably, there are four culture tanks 1.1, which are spaced horizontally apart on the base plate 1. In this embodiment, as the number of culture tanks 1.1 increases, the number of upper covers covering the culture tanks 1.1 also increases. To prevent the lids from accidentally becoming detached from the base plate 1 when the base plate 1 and the lids are inverted, a carrier plate (not shown) is provided on the base plate 1 to abut against all the lids. The carrier plate is pressed against the lids, and the operator only needs to apply relative force to the carrier plate and the base plate 1 to prevent some of the lids from becoming detached from the base plate 1.

[0032] In the above embodiment, after the balls 3 have been coated and returned to the receiving chamber 2, the microorganisms in the culture tank need to be cultured subsequently. At this time, the balls 3 in the receiving chamber 2 located above the culture tank can be cultured together with the culture tank, or the upper cover can be used to remove the balls 3 in the receiving chamber 2 from the culture tank and then a conventional culture dish cover can be selected to cover the notch of the culture tank 1.1 after coating. The balls 3 in the receiving chamber 2 can be cultured together with the culture tank, which can keep the notch of the culture tank 1.1 always in a covered state, but there is a risk that the balls 3 will fall into the culture tank 1.1. The method of removing the cover and replacing the conventional culture dish cover can avoid the risk of the balls 3 falling into the culture tank 1.1 during the culture process. The disadvantage of this method is that the process of replacing the culture dish cover will cause the notch of the culture tank 1.1 to be open for a short time, but this open time is much shorter than the time for coating using a coating rod in the prior art.

[0033] Based on the preference of the above embodiment, the cover includes an upper cover 4 and a lower cover 5. The upper cover 3 is located above the lower cover 5. The upper cover 3 and the lower cover 5 are closed in the thickness direction and enclosed to form a receiving cavity 2. The upper cover 4 is covered on the outside of the lower cover 5. The upper cover 4 and the lower cover 5 are slidably matched in the thickness direction. The first through hole 7 is arranged on the lower cover 5. A hole-blocking member 9 is provided at a position corresponding to the first through hole 7 on the upper cover 4. The upper cover 4 drives the hole-blocking member 9 to move upward or downward so that the distance between the hole-blocking member 9 and the first through hole 7 is greater than or equal to the diameter of the ball 3 or less than the diameter of the ball 3. In this embodiment, the position of the upper cover 4 relative to the lower cover 5 includes an upward position and a downward position. When the upper cover 4 is in the upward position, as shown in FIG. Figure 5 The distance between the hole-blocking member 9 and the first through hole 7 on the upper cover 4 is larger than the diameter of the ball 3, so that the ball 3 in the accommodating chamber 2 can smoothly pass through the distance and the first through hole 7 and fall into the culture tank 1.1, or when the bottom plate 1 is inverted, the ball 3 in the culture tank 1.1 is allowed to pass through the first through hole 7 and the distance between the hole-blocking member 9 and the first through hole 7 and fall back into the accommodating chamber 2; when the upper cover 4 is in the downward position, as shown Figure 6 As shown, the distance between the hole-blocking member 9 and the first through hole 7 is smaller than the diameter of the ball 3 , and in particular, the hole-blocking member 9 is inserted into the first through hole 7 .

[0034] See also Figures 4 to 7 The lid also includes a bottom cover 6 located below the lower cover 5. A second through hole 8 is provided on the bottom cover 6 at a position corresponding to the first through hole 7. The aperture of the second through hole 8 matches that of the first through hole 7. The bottom cover 6 is connected to the upper cover 4 in a detachable manner, and the bottom cover 6 can be disengaged from the upper cover 4 when the upper cover 4 is away from the bottom plate 1.

[0035] Based on the preferred example of the lid with the bottom cover 6 in the above embodiment, the outer wall of the bottom cover 6 is slidably engaged with the inner wall of the upper cover 4, the friction between the bottom cover 6 and the upper cover 4 is greater than the weight of the bottom cover 6, and when the upper cover 4 moves upward away from the bottom plate 1, the force exerted by the bottom plate 1 on the bottom cover 6 is greater than the friction between the bottom cover 6 and the upper cover 4. The force exerted by the bottom plate 1 on the bottom cover 6 includes but is not limited to the friction force exerted by the bottom plate 1 on the bottom cover 6. Because the friction between the bottom cover 1 and the upper cover 4 is greater than the gravity of the bottom cover 6, the bottom cover 6 can remain on the upper cover 4 during the movement of the cover. When the cover is closed on the culture tank 1.1 and the coating work is completed and the cover is removed, the combined force of the force applied to the bottom cover 6 by the bottom plate 1 and the gravity of the bottom cover 6 can overcome the friction between the bottom cover 6 and the upper cover 4, so that the bottom cover 6 is disengaged from the upper cover 4 and remains on the culture tank 1.1. In this way, not only can the upper cover 4, the lower cover 5 and the balls 3 in the accommodating cavity 2 be removed to complete cleaning and disinfection, but the bottom cover 6 always keeps covering the slot of the culture tank 1.1, reducing the contamination of the microorganism culture in the culture tank by external microorganisms.

[0036] Since the bottom cover 6 has the second through hole 8 , the second through hole 8 still needs to be covered after the upper cover 4 and the lower cover 5 are removed, including but not limited to covering the bottom cover 6 with an existing conventional culture dish cover.

[0037] Based on the preferred embodiment described above, the hole-blocking member 9 is a columnar structure that matches the second through-hole 8. The upper end surface of the hole-blocking member 9 has an insertion rod 10. The upper cover 4 is provided with a slot 11 at a position corresponding to the insertion rod 10. The insertion rod 10 and the slot 11 are plugged into each other. When the upper cover 4 drives the hole-blocking member 9 downward into the second through-hole 8 and moves upward, the insertion rod 10 of the hole-blocking member 9 is disengaged from the slot 11. Specifically, when the upper cover 4 drives the hole-blocking member 9 downward into the second through-hole 8, the friction between the hole-blocking member 9 and the second through-hole 8 is greater than the friction between the insertion rod and the slot 11, or the hole-blocking member 9 is engaged with the second through-hole 8, so that when the upper cover 4 moves upward, the hole-blocking member 9 is disengaged from the upper cover 4 and remains in the second through-hole 8.

[0038] Preferably, if Figure 10As shown, the second through hole 8 is provided with an annular flange 12 extending into the first through hole 7. The outer diameter of the hole-blocking member 9 matches the inner diameter of the annular flange 12. When the upper cover 4 drives the hole-blocking member 9 downward into the second through hole 8, the hole-blocking member 9 is tightly fitted with the second through hole 8. Specifically, the hole-blocking member 9 is made of a plastic material with elastic deformation ability.

[0039] See also Figures 5 to 7 、 Figure 10 As shown, a positioning ring 13 is provided on the inner side wall of the upper cover 4, and the lower cover 5 is made of a plastic material that can be elastically deformed. When the upper cover 4 is in the downward position, as shown in FIG. Figure 6 The positioning ring 13 shown corresponds to the connection between the lower cover 5 and the bottom cover 6. The positioning ring 13 can separate the lower cover 5 and the bottom cover 6 by a certain gap. When the upper cover 4 moves from the lower position to the upper position, Figure 7 The positioning ring 13 shown can enable the lower cover 5 to move upwards better along with the upper cover 4 .

[0040] Preferably, a guiding inclined surface 14 is provided on the upper end surface of the lower cover 5 for driving the balls 3 in the accommodating cavity 2 to roll toward the location of the first through hole 7 .

[0041] See also Figure 9 As shown, the first through hole 7 is connected to the outer edge of the accommodating cavity 2. The upper end surface of the lower cover 5 is inclined, and the first through hole 7 is located at a lower position of the upper end surface in the vertical direction. The center position of the upper end surface of the lower cover 5 protrudes upward in the vertical direction to form a conical surface. The conical surface and the inclined upper end surface of the lower cover 5 constitute a guide slope 14 for guiding the balls 3 to roll toward the location of the first through hole 7. The guide slope 14 not only enables the multiple balls 3 to move radially outward and close to the side wall of the accommodating cavity 2, but also moves circumferentially toward the location of the first through hole 7, thereby allowing each ball 3 to fall into the first through hole 7 in sequence, reducing the extrusion blockage caused by two balls 3 entering the first through hole 7 at the same time.

[0042] Preferably, the lower end surface of the bottom cover 6 is tilted so that the balls 3 in the culture tank 1.1 roll toward the location of the first through hole 7 when the bottom cover 6 is inverted.

[0043] See also Figure 10 As shown, a protective sticker 16 is provided on the lower end surface of the bottom cover 6, and the protective sticker 16 covers the second through hole 8. The protective sticker 16 is torn off before the upper cover 4 is closed on the culture tank 1.1.

[0044] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

[0045] Various changes and modifications will undoubtedly become apparent to those skilled in the art upon reading the foregoing description. Therefore, the appended claims should be construed to encompass all changes and modifications within the true intent and scope of the present invention. Any and all equivalents within the scope of the claims should be considered to be within the intent and scope of the present invention.

Claims

1. A culture dish with a coating function, comprising a base plate (1), the base plate (1) having a plurality of culture grooves (1.1) with openings facing upward, each culture groove (1.1) being provided with a lid, characterized in that: The interior of the cover has a receiving cavity (2), and a plurality of balls (3) are arranged in the receiving cavity (2). The bottom of the cover has a first through hole (7) that is connected to the receiving cavity (2) and allows the balls (3) to pass through. The receiving cavity (2) is connected to the culture tank (1.1) through the through hole.

2. The culture dish with coating function according to claim 1, characterized in that: The cover comprises an upper cover (4) and a lower cover (5), the upper cover (4) and the lower cover (5) together form a receiving cavity (2), and the upper cover (4) and the lower cover (5) are slidably matched along the thickness direction, the first through hole (7) is arranged on the lower cover (5), and a hole-blocking member (9) is provided on the upper cover (4) at a position corresponding to the first through hole, and the upper cover (4) drives the hole-blocking member (9) to move upward or downward, so that the distance between the hole-blocking member (9) and the first through hole (7) is greater than or equal to the diameter of the ball (3) or less than the diameter of the ball (3).

3. The culture dish with coating function according to claim 2, characterized in that: The cover further comprises a bottom cover (6) located below the lower cover (5); a second through hole (8) is provided on the bottom cover (6) at a position corresponding to the first through hole (7); the aperture of the second through hole (8) matches that of the first through hole (7); the bottom cover (6) is connected to the upper cover (4) in a detachable manner, and the bottom cover (6) can be detached from the upper cover (4) when the upper cover (4) is away from the bottom plate (1).

4. The culture dish with coating function according to claim 3, characterized in that: The outer wall of the bottom cover (6) is slidably engaged with the inner wall of the upper cover (4), the friction force between the bottom cover (6) and the upper cover (4) is greater than the weight of the bottom cover (6), and when the upper cover (4) moves upward away from the bottom plate (1), the force exerted by the bottom plate (1) on the bottom cover (6) is greater than the friction force between the bottom cover (6) and the upper cover (4).

5. The culture dish with coating function according to claim 4, characterized in that: The hole-blocking member (9) is a columnar structure matching the second through hole (8), and the upper end surface of the hole-blocking member (9) is provided with an insertion rod (10). A slot (11) is provided on the upper cover (4) at a position corresponding to the insertion rod (10). The insertion rod (10) and the slot (11) are plugged into each other. When the upper cover (4) drives the hole-blocking member (9) to move downward into the second through hole (8) and upward, the insertion rod (10) of the hole-blocking member (9) is disengaged from the slot (11).

6. The culture dish with coating function according to claim 5, characterized in that: The second through hole (8) is provided with an annular flange (12) extending toward the inside of the first through hole (7), and the outer diameter of the hole blocking member (9) matches the inner diameter of the annular flange (12).

7. The culture dish with coating function according to claim 5, characterized in that: A positioning ring (13) is provided on the inner side wall of the upper cover (4), and the lower cover (5) is made of a plastic material capable of elastic deformation.

8. The culture dish with coating function according to any one of claims 2 to 7, characterized in that: The lower cover (5) is provided with a guide inclined surface (14) for driving the balls (3) in the accommodating cavity (2) to roll toward the location of the first through hole (7).

9. The culture dish with coating function according to any one of claims 3 to 7, characterized in that: The lower end surface of the bottom cover (6) is arranged to be inclined so that the balls (3) in the culture tank (1.1) roll toward the location of the first through hole (7) when the bottom cover (6) is inverted.

10. The culture dish with coating function according to claim 1, characterized in that: The bottom plate (1) has four culture tanks (1.1), and the culture tanks (1.1) are arranged at intervals in the horizontal direction.

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