Bracket for speaker, frame for speaker, and speaker

Abstract

To provide a bracket for a speaker which enables strength to be secured when the speaker is attached by using an attachment plate and enables improvement of workability in folding of the attachment plate when the speaker is attached without using the attachment plate.SOLUTION: A bracket 1 for a speaker includes: a frame-like support part 10 for supporting a speaker; and attachment members 20, 21 which are used to attach the speaker supported by the support part 10 to the outside and provided at the support part 10. A plurality of grooves 201, 202 extending in different directions are continuously formed at a base part B of the attachment member 20 which connects the attachment member 20 and the support part 10 with each other.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present application relates to the technical fields of speaker brackets, speaker frames, and speakers. More specifically, the present application relates to the technical fields of speaker brackets, speaker frames, and speakers including structures for mounting speakers externally (for example, inside a vehicle door). [Background technology]

[0002] Generally, in-vehicle speakers are classified into speakers that are installed when the vehicle is manufactured and speakers that are installed after the vehicle is sold, for example, by removing the speakers that were installed when the vehicle was manufactured.

[0003] In the latter case, the configuration or structure of the part of the vehicle where the speaker is to be installed is adapted to the configuration or structure for installation of the speaker originally installed at the time of manufacture, and may not match the configuration or structure for installation of the newly installed speaker. In such cases, a separate installation part called a bracket (or attachment or adapter; hereinafter, these will be collectively referred to as "bracket") is typically interposed between the speaker and the vehicle, and the newly installed speaker is then attached to the original speaker's position. Prior art documents relating to such bracket structures include, for example, Patent Document 1 listed below. The technology described in Patent Document 1 is configured to include multiple mounting plates that protrude horizontally outward from the outer periphery of the speaker frame and cutting lines provided at the base ends of the multiple mounting plates. Depending on the structure of the newly installed part, if no mounting plates are needed, the mounting plates are broken off from the cutting lines before the speaker is installed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Publication No. 1-10068 Summary of the Invention [Problem to be solved by the invention]

[0005] The cutting line disclosed in Patent Document 1 has a plurality of cut holes arranged in a line along the outer periphery of the frame. However, when a speaker is attached using the mounting plate described in Patent Document 1, the cut holes may result in insufficient strength. Therefore, when attaching the speaker described in Patent Document 1 to another component (e.g., a vehicle), there is a problem in that it is not possible to both ensure the strength of the speaker when attached using a mounting plate and improve the workability of breaking off the mounting plate when attaching a speaker without using a mounting plate.

[0006] The present application has been made in consideration of the above-mentioned problems, and one example of its objective is to provide a speaker bracket, speaker frame, and speaker that can simultaneously ensure strength when attaching a speaker using a mounting plate and improve workability in breaking off the mounting plate when attaching a speaker without using a mounting plate. [Means for solving the problem]

[0007] In order to solve the above problem, the invention described in claim 1 comprises a support part that supports a speaker, and an attachment member that is used to attach the speaker supported by the support part to an external device, the attachment member being provided on the support part, wherein a plurality of grooves extending in different directions are formed continuously at the base of the attachment member that connects the attachment member to the support part, and the attachment member is configured to be positioned on the outer peripheral edge of the support part.

[0008] In order to solve the above problem, the invention described in claim 7 comprises a diaphragm support part that supports the diaphragm of a speaker, and an attachment member that is used to attach the speaker having the diaphragm support part to the outside, the attachment member being provided on the diaphragm support part, wherein a plurality of grooves extending in different directions are formed continuously at the base of the attachment member that connects the attachment member to the support part, and the attachment member is configured to be positioned on the outer peripheral edge of the support part.

[0009] In order to solve the above problem, the invention described in claim 8 comprises a diaphragm support part that supports a diaphragm, and a mounting member that is provided on the diaphragm support part and is used to mount a speaker externally, wherein a plurality of grooves extending in different directions are formed continuously at the base of the mounting member that connects the mounting member to the support part, and the mounting member is configured to be positioned on the outer peripheral edge of the support part. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view showing the appearance of a speaker bracket according to an embodiment and an example, illustrating how the speaker bracket is used. [Figure 2] FIG. 1 is a front view showing the configuration of a speaker bracket according to an embodiment and an example. [Figure 3] FIG. 1 is a rear perspective view showing the configuration of a speaker bracket according to an embodiment and an example. [Figure 4] FIG. 1 is a front perspective view showing the configuration of a speaker bracket according to an embodiment. [Figure 5] 1A and 1B are enlarged views of the rear surface showing the configuration of the mounting member of the embodiment, where FIG. 1A is an enlarged view of the rear surface, and FIG. 1B is an enlarged view of the front surface showing the configuration of the mounting member of the embodiment. [Figure 6] 1A and 1B are enlarged side views showing the configuration of the mounting member of the embodiment, in which FIG. 1A is an enlarged side view, and FIG. 1B is an enlarged rear perspective view showing the configuration of the mounting member. [Figure 7] FIG. 1 is a front view illustrating a usage mode of the speaker bracket according to the embodiment. [Figure 8]FIG. 11 is an enlarged view (I) of the back surface showing the configuration of the mounting member of each modified example, where (a) is an enlarged view of the back surface showing the configuration of the mounting member of the first modified example, and (b) is an enlarged view of the back surface showing the configuration of the mounting member of the second modified example. [Figure 9] 10A and 10B are enlarged views (II) of the back surface showing the configuration of the mounting member of each modified example, where (a) is an enlarged view of the back surface showing the configuration of the mounting member of the third modified example, and (b) is an enlarged view of the back surface showing the configuration of the mounting member of the fourth modified example. DETAILED DESCRIPTION OF THE INVENTION

[0011] Next, an embodiment of the present application will be described with reference to Figs. 1 to 3. Fig. 1 is an external perspective view showing the use state of a speaker bracket according to an embodiment and an example, Fig. 2 is a front view showing the configuration of the speaker bracket, and Fig. 3 is a rear perspective view showing the configuration of the speaker bracket. In the embodiments and examples described below, the surface of the speaker bracket on which a speaker (described later) is fixed and supported is referred to as the front, and the surface of the speaker bracket on which the speaker is fixed is referred to as the rear. Fig. 1 also shows an external perspective view of only the outline of the speaker bracket according to the embodiment, indicated by dashed lines.

[0012] 1, the speaker bracket 1 of the embodiment is a component that enables a speaker SP to be attached to the door trim BD of various vehicle models by being interposed between the door trim BD of a vehicle and a new speaker SP to be attached. More specifically, the speaker SP is supported and fixed to the speaker bracket 1 using mounting holes p1 through p4 of the speaker SP, and the speaker bracket 1 in this state is fixed to the speaker hole BH in the door trim BD using mounting holes h1 and h2 in the door trim BD. For this reason, the speaker bracket 1 is provided with two types of fixing holes: speaker fixing holes for supporting and fixing the speaker SP using mounting holes p1 through p4, and bracket fixing holes for fixing the speaker bracket 1 itself, with the speaker SP fixed thereto, to the speaker hole BH using mounting holes h1 and h2. In this case, since the number and positions of mounting holes h1 etc. provided on the periphery of the speaker hole BH vary depending on the vehicle model to which the speaker SP is to be installed, the speaker bracket 1 of the embodiment has multiple bracket fixing holes so that one type of speaker bracket 1 can be used to accommodate each anticipated vehicle model.

[0013] That is, as shown in Figures 1 to 3, the speaker bracket 1 of the embodiment comprises a support part 10 that supports a speaker SP, and an attachment member 20 that is used to attach the speaker SP supported by the support part 10 to the outside, and is provided on the support part 10, and a plurality of grooves 201 and grooves 202 extending in different directions are formed continuously at a base B of the attachment member 20 that connects the attachment member 20 and the support part 10.

[0014] As described above, according to the configuration of speaker bracket 1 of the embodiment, a plurality of grooves 201 and 202 extending in different directions are continuously formed in the base of mounting member 20 used to mount speaker SP externally. This makes it possible to both ensure strength when mounting speaker SP externally using mounting member 20 and improve workability in separating the mounting member when mounting speaker SP externally without using mounting member 20. [Example]

[0015] Next, specific examples corresponding to the above-described embodiment will be described using Figures 4 to 7 in addition to Figures 1 to 3. Note that the examples described below are examples in which the embodiment is applied to a speaker bracket used to remove an originally fixed speaker and fix a new speaker SP in the removed position. In Figures 4 to 7, the same component numbers as those of the speaker bracket 1 of the embodiment are used for components of the example that correspond to the components of the speaker bracket 1 of the embodiment shown in Figures 1 to 3.

[0016] First, the overall structure of the speaker bracket of the embodiment will be described with reference to Fig. 4. Fig. 4 is a front perspective view showing the configuration of the speaker bracket of the embodiment. The speaker bracket of the embodiment described below is formed by integral molding using, for example, resin as a material.

[0017] 4, speaker bracket 1 of the example corresponding to the embodiment is configured with a plurality of speaker fixing holes SL1 to SL4, a plurality of bracket fixing holes HL1 to HL8 and bracket fixing holes HS1 to HS8, mounting members 20 and 21 of the example, and positioning protrusions 25 to 28 for fixing speaker SP to speaker bracket 1, around the periphery of circular frame-shaped support portion 10 that is matched to the outer shape of speaker SP. In this configuration, bracket fixing holes HL1 to HL8 are elongated bracket fixing holes drilled along the radial direction of support portion 10 in protrusions 11 to 16 that protrude radially outward from the outer periphery of support portion 10. Meanwhile, bracket fixing holes HS1 to HS8 are circular bracket fixing holes drilled around the periphery of support portion 10. These bracket fixing holes HL1 to HL8 and bracket fixing holes HS1 to HS8 are used to fix the speaker bracket 1 to the position of the speaker hole BH in the interior trim BD, depending on the number and positions of the mounting holes h1, etc. in the interior trim BD. In contrast, speaker fixing holes SL1 to SL4 are speaker fixing holes used to fix the speaker SP to the speaker bracket 1, and are opened in the support part 10 to match the number and positions of the mounting portions p1 to p4 (see FIG. 1) of the speaker SP. In addition, protrusions 25 to 28 are provided on the periphery of the support part 10 as protrusions in positions and shapes that allow the above-mentioned positioning.

[0018] In addition, mounting members 20 and 21 of the embodiment are formed on both sides of protrusion 14 on the outer periphery of support portion 10 to lock speaker bracket 1 (i.e., hook speaker bracket 1 onto part of the inner periphery of speaker hole BH in a specific vehicle model) and fix it in place. The detailed configurations of mounting members 20 and 21 will be described in detail later using Figures 3, 5 and 6.

[0019] Meanwhile, separation grooves L1 to L16 corresponding to the number and positions of mounting holes h1 of the speaker holes BH in the vehicle model to which the speaker bracket 1 is expected to be fixed are formed (i.e., carved into the surface) on the front surface of each of the protrusions 11 to 16. Each of these separation grooves L1 to L16 is a separation groove for separating the portion outside the separation groove L1 to L16 from the support part 10 according to the vehicle model to be expected. This separation is performed, for example, by cutting the separation groove or breaking off the portion outside.

[0020] Next, the detailed configuration of the mounting member 20 and the mounting member 21 of the embodiment will be described in more detail with reference to FIGS. 3, 5, and 6. FIG. 5 is an enlarged rear view showing the configuration of the mounting member of the embodiment, and FIG. 6 is an enlarged side view showing the configuration of the mounting member. FIG. 5(a) is an enlarged side view of the mounting member 20 as viewed from direction A in FIG. 3. In FIG. 5(b), the separation grooves 201 and 202, which will be described later and which are formed on the rear side of the mounting member 20, as well as the bending point IP, are indicated by dashed lines. Furthermore, the mounting members 20 and 21 are positioned and shaped symmetrically with respect to the radius of the support portion 10, which passes through the bracket fixing holes HL5 and HS4 of the protrusion 14. Therefore, in the following description, the detailed configuration of the mounting member 20 will be described using the mounting member 20 and the mounting member 21 as representative examples.

[0021] As shown in Fig. 5(a) showing an enlarged back view, Fig. 5(b) showing an enlarged front view, Fig. 6(a) showing an enlarged side view, and Fig. 6(b) showing an enlarged perspective view of the back, the mounting member 20 of the example is configured with a locking portion 200 having reinforcing ribs 203 and 204 on the back surface and reinforcing ribs 205 and 206 on the front surface. A base B of the mounting member 20 (i.e., the base B of the mounting member 20, which is flush with the back surface of the support portion 10 and connects the support portion 10 and the mounting member 20) that connects the mounting member 20 having the locking portion 200 to the support portion 10 has separation grooves 201 and 202 formed in the surface (i.e., carved in the surface) on the back side for separating the mounting member 20 from the support portion 10. The separation groove 201 corresponds to an example of the groove 201 of the embodiment, and the separation groove 202 corresponds to an example of the groove 202 of the embodiment. In this case, separation grooves 201 and 202 are linear, continuous grooves bent at bends IP, and have a substantially V-shaped cross section. Mounting member 20 can be separated from support part 10 as needed by cutting separation grooves 201 and 202 or by breaking mounting member 20 off from separation grooves 201 and 202. With this configuration, when speaker SP is mounted externally (for example, to the interior lining BD of a car door), mounting member 20 can be separated from speaker bracket 1 in accordance with the shape of the external mounting portion.

[0022] From the viewpoint of the mounting strength of speaker SP using mounting members 20 and 21, the depth of each of separation grooves 201 and 202 is preferably set to a depth equivalent to about 1 to 30 percent of the thickness of base B. The length, width and bending angle at bending portion IP of each of separation grooves 201 and 202 are set so that the shape of the position of support part 10 where mounting member 20 was located after mounting member 20 is separated conforms to the shape of the inner periphery of speaker hole BH, to which speaker bracket 1 is fixed without mounting member 20, at a position opposite to the position of support part 10 where mounting member 20 was located.

[0023] Next, usage modes of the speaker bracket 1 of the embodiment will be specifically described with reference to Fig. 7. Fig. 7 is a front view illustrating usage modes of the speaker bracket.

[0024] For example, when fixing speaker bracket 1 to speaker hole BH of a first vehicle model, speaker bracket 1 is used with mounting members 20 and 21 left in place, so that mounting members 20 and 21 are positioned, for example, vertically downward when viewed from the center of speaker bracket 1, as shown in the front view of Fig. 7(a). Then, speaker bracket 1 is fixed to speaker hole BH by engagement with mounting members 20 and 21 and by fixation using bracket fixing hole HL1, for example. At this time, other bracket fixing holes such as HS2 are not used.

[0025] Furthermore, when fixing speaker bracket 1 to speaker hole BH of a second vehicle model, for example, speaker bracket 1 is used as speaker bracket 1-1 with the portions outside separation grooves L3, L6, L9, L10, L12, and L15 separated, as shown in the front view of FIG. 7(b). At this time, mounting members 20 and 21 are also separated and used. Bracket fixing holes HS2, HS4, HS6, and HS8 are used as actual bracket fixing holes, and other bracket fixing holes such as HL1 are not used.

[0026] Furthermore, when fixing speaker bracket 1 to speaker hole BH of a third vehicle model, for example, speaker bracket 1 is used as speaker bracket 1-2 with the portions outside separation grooves L2, L4, L9, and L12 separated, as shown in the front view of FIG. 7(c). At this time, mounting members 20 and 21 are also separated and used. Bracket fixing holes HL1, HL2, HL5, and HL8 are used as actual bracket fixing holes, and other bracket fixing holes such as HS2 are not used.

[0027] Furthermore, when speaker bracket 1 is fixed to speaker hole BH of a fourth vehicle model, for example, speaker bracket 1 is used as speaker bracket 1-3 in which the portions outside separation grooves L1, L2, L4, L5, L9, L11, L12, and L16 are separated, as shown in the front view of FIG. 7(d). At this time, mounting members 20 and 21 are also separated and used. Bracket fixing holes HL1, HL2, HL5, and HL8 are used as actual bracket fixing holes, and other bracket fixing holes such as HS2 are unused.

[0028] Furthermore, when speaker bracket 1 is fixed to speaker hole BH of a fifth vehicle model, for example, speaker bracket 1 is used as speaker bracket 1-4 in which the portions outside separation grooves L2, L4, L6, L8, L10, L13, and L15 are separated, as shown in the front view of FIG. 7(e). At this time, mounting members 20 and 21 are also separated and used. Bracket fixing holes HL1, HL3, and HS7 are used as actual bracket fixing holes, and other bracket fixing holes such as HS2 are not used.

[0029] Finally, when fixing speaker bracket 1 to speaker hole BH of a sixth vehicle model, for example, speaker bracket 1 is used as speaker bracket 1-5, with the portions outside separation grooves L2, L4, L6, L9, L10, L12, and L15 separated, as shown in the front view of FIG. 7(f). At this time, mounting members 20 and 21 are also separated and used. Bracket fixing holes HS8, HS3, and HS5 are used as actual bracket fixing holes, and other bracket fixing holes such as HL1 are unused.

[0030] 2, 4 and 7, the separation grooves L1 to L16 are described as being linear, but they may be curved separation grooves.

[0031] As described above, according to the configuration of the speaker bracket 1 of the embodiment, a plurality of separation grooves 201 and 202 extending in different directions are continuously formed in the base B of the mounting member 20 used to mount the speaker SP in the speaker hole BH. This makes it possible to both ensure strength when mounting the speaker SP to the interior lining BD using the mounting member 20 and improve workability in separating the mounting member when mounting the speaker SP to the interior lining BD without using the mounting member 20.

[0032] Furthermore, since the separation grooves 201 and 202 are multiple linear grooves connected at one bending point IP, the separation grooves 201 and 202 can be formed in a simple process while maintaining strength and improving workability.

[0033] Furthermore, the overall shape of the separation grooves 201 and 202 when viewed from a direction perpendicular to the extension directions of the separation grooves 201 and 202 (see Figure 5) corresponds to the shape of the speaker hole BH to which the speaker SP is attached via the speaker bracket 1 after the mounting member 20 has been separated, so that the speaker SP can be securely attached to the required area using the speaker bracket 1 after the mounting member 20 has been separated.

[0034] Furthermore, since the separation grooves 201 and 202 are formed only on one surface (i.e., the surface on the back side) of the plate-shaped base B (see Figures 5 and 6), sufficient strength can be ensured when attaching the speaker SP to the outside using the mounting member 20.

[0035] [Variations] Next, modified examples corresponding to the embodiment will be described with reference to Figures 8 and 9. Figures 8 and 9 are enlarged views of the rear surface showing the configuration of the mounting member of each modified example. In Figures 8 and 9, the same components as those in the mounting member 20 and support part 10 of the embodiment will be designated by the same component numbers and detailed description will be omitted.

[0036] (I) First Modification First, the configuration of the mounting member of the first modified example will be described with reference to FIG. 8(a). As shown in FIG. 8(a) , an enlarged view of the rear surface of the mounting member 20-1 of the first modified example shows, in the mounting member 20-1 of the first modified example, the separation groove formed continuous with the separation groove 202 of the embodiment via a bent portion IP is not linear but is a curved separation groove 210 that protrudes toward the mounting member 20. This separation groove 210 corresponds to another example of the groove 201 of the embodiment. The rest of the configuration of the mounting member 20-1 of the first modified example is the same as that of the mounting member 20 of the embodiment, so detailed description will be omitted. With this configuration of the mounting member 20-1 of the first modified example, when the speaker SP is mounted using the mounting members 20 and 21, the central portion of the separation groove 210 protrudes vertically downward (see the usage mode shown in FIG. 7(a)). As a result, if, for example, rain gets behind the speaker SP after installation, even if the moisture from the rain enters from the right side of the separation groove 210 in Fig. 8(a), it can be collected in the protruding portion, thereby preventing the moisture from dripping downward (i.e., resulting in a rain leak). Note that in the curved separation grooves 210 etc. of the first to fourth modified examples, the direction of the tangent to the curve is the extension direction of the separation grooves 210 etc.

[0037] (II) Second Modification Next, the configuration of the mounting member of the second modified example will be described with reference to FIG. 8(b). As shown in FIG. 8(b), which is an enlarged view of the rear surface, the mounting member 20-2 of the second modified example has a curved separation groove 210 similar to that of the first modified example, and a curved separation groove 211 that protrudes toward the mounting member 20 similar to the separation groove 210, which are formed continuously in the base B via a bent portion IP. This separation groove 211 corresponds to another example of the groove 202 of the embodiment. The rest of the configuration of the mounting member 20-2 of the second modified example is similar to that of the mounting member 20-1 of the first example, so detailed description will be omitted. The separation groove 210 of the mounting member 20-2 of the second modified example also has the same effect of suppressing rain leakage as the separation groove 210 of the first modified example.

[0038] (III) Third Modification Next, the configuration of the mounting member of the third modified example will be described with reference to Fig. 9(a). As shown in Fig. 9(a), which is an enlarged view of the back side, mounting member 20-3 of the third modified example does not have the bent portion IP where separation groove 201 and separation groove 202 of the example were connected, and only a curved separation groove 212 is formed. This separation groove 212 corresponds to yet another example of groove 201 and yet another example of groove 202 of the embodiment. The rest of the configuration of mounting member 20-3 of the third modified example is similar to the configuration of mounting member 20 of the example, so detailed description will be omitted.

[0039] (IV) Fourth Modification Finally, the configuration of the mounting member of the fourth modified example will be described with reference to Fig. 9(b). As shown in Fig. 9(b), which is an enlarged view of the rear surface, mounting member 20-4 of the fourth modified example does not have a bent portion IP like mounting member 20-3 of the third embodiment, and is formed with only a curved separation groove 213 that is different in shape from separation groove 212 of the third embodiment. This separation groove 213 corresponds to yet another example of groove 201 and yet another example of groove 202 of the embodiment. The rest of the configuration of mounting member 20-4 of the fourth modified example is the same as the configuration of mounting member 20 of the embodiment, so detailed description will be omitted.

[0040] As described above, according to the configuration of the mounting member 20-1 etc. of each modified example, the separation groove 210 etc. includes a curved groove, so that the separation groove 210 etc. can be formed in a simple process while maintaining strength and improving workability.

[0041] Furthermore, according to the configurations of the mounting member 20-2 of the second modified example, the mounting member 20-3 of the third modified example, and the mounting member 20-4 of the fourth modified example, the entire separation grooves 210 to 213 are curved grooves, so that the separation grooves can be formed in a simple process while maintaining strength and improving workability.

[0042] Although the embodiment and the first and second modified examples described above have only one bending portion IP, the separation groove may be formed of a straight or curved groove having multiple bending points. Also, while the cross section of the separation groove 201 etc. is substantially V-shaped, the separation groove 201 etc. may be formed of a groove having a rectangular cross section with a bottom surface along the extension direction, a groove having a semicircular cross section, or a groove having a U-shaped cross section.

[0043] In addition, in the above-mentioned embodiments and each modified example, the case where the separation groove 201 etc. is formed on the back side of the base B of the mounting member 20 has been described, but in addition to this, the separation groove 201 etc. may also be formed on the surface of the base B or the support part 10 or the front side of the mounting member 20 and the mounting member 21.

[0044] Furthermore, in the above-described embodiment and each modified example, the present application has been described as being applied to a speaker bracket 1 that is interposed between a speaker SP and an interior trim BD to fix the speaker SP to the interior trim BD, but the configuration of the frame-shaped speaker frame itself that supports the diaphragm of the speaker attached to the interior trim BD, or the outer periphery of the speaker itself, can also be the same as the configuration of the mounting member 20 and mounting member 21 in the above-described embodiment, or the speaker bracket 1 including the mounting member 20-1 in each modified example. In this case, too, the same effects as those of the above-described embodiment or each modified example can be achieved.

[0045] Furthermore, in the above-mentioned embodiments and variant examples, the case where the back surface of the peripheral portion of the support portion 10 is flat is described (see Figure 3), but in addition to this, a lightening portion for weight reduction may be formed at a position other than the position of the bracket fixing hole HS1, etc. on the back surface of the peripheral portion.

[0046] In the above-described embodiment and each modified example, the entire speaker bracket 1 is formed by integral molding using resin, but other than this, parts may be made of different materials. [Explanation of symbols]

[0047] 1, 1-1, 1-2, 1-3, 1-4, 1-5 Speaker bracket 10 Support part 20, 20-1, 20-2, 20-3, 20-4, 21 Mounting parts 201, 202, 210, 211, 212, 213 Separation grooves SP speaker BH speaker hole IP bend B base

Claims

[Claim 1] a support portion that supports the speaker; a mounting member provided on the support portion, the mounting member being used to mount the speaker supported by the support portion to an exterior; A speaker bracket, characterized in that a base portion of the mounting member that connects the mounting member and the support portion has a plurality of grooves formed continuously in different extending directions.

Images