Patent Application
20230317042
This application claims the priority benefit of Japan application serial no. 2022-054432 filed on Mar. 29, 2022. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.
The invention relates to an electronic cymbal and a striking detection method, and particularly relates to an electronic cymbal and a striking detection method capable of facilitating the sensor sensitivity with respect to striking from a lateral direction.
An electronic cymbal including a frame, an edge sensor installed to an upper surface on an outer edge side of the frame, and a cover covering an upper surface of the frame in a state in which a space is formed between the edge sensor and the cover and detecting striking to an outer edge portion of the cover (frame) by the edge sensor is known.
For example, Patent Document 1 recites an electronic cymbal including an upper cover part 5b1 covering an upper surface of a frame 4 and a lower cover part 5b2 with coverage from an outer edge (outer peripheral surface) of the frame 4 to an edge part of a lower surface. In such technique, a protrusion part 5b3 protruding toward an edge sensor 7b is formed in the upper cover part 5b1, and when the performer strikes an outer edge portion of the upper cover part 5b1 from the top by a stick, etc., due to elastic deformation (bending) of the upper cover part 5b1, the protrusion part 5b3 is pressed to the edge sensor 7b. Accordingly, the striking to the outer edge portion of the cover 5 (the frame 4) is detected by the edge sensor 7b.
However, in the conventional technology, when the outer edge portion of the cover 5 is struck in a state in which the stick is upright (referred to striking from the lateral direction), before the protrusion part 5b3 is pressed to the edge sensor 7b, the upper cover 5b1 or the lower cover part 5b2 may contact the outer edge of the frame 4. When such contact occurs, since the pressing of the edge sensor 7b due to the protrusion part 5b3 is insufficient, an issue that the sensitivity of the edge sensor 7b with respect to the striking from the lateral direction may be low arises.
An electronic cymbal according to an aspect of the invention includes: a plate-like frame; a sensor installed to an upper surface on an outer edge side of the frame; and a cover covering upper surfaces of the sensor and the frame. The cover includes an upper cover part covering the upper surface of the frame in a state in which a space is formed between the upper cover part and the sensor; a lateral cover part extending from an outer edge of the upper cover part and covering an outer peripheral surface of the frame in a state in which a space is formed between the lateral cover part and an outer peripheral surface of the frame; and a lower cover part, extending from a lower end of the lateral cover part to an inner peripheral side and covering a lower surface of the frame. The upper cover part or the frame comprises a stopper facing the space between the upper cover part and the sensor and limits deformation of the upper cover part toward an inner peripheral side.
An electronic cymbal according to another aspect of the invention includes: a plate-like frame; a sensor installed to an upper surface on an outer edge side of the frame; and a cover covering upper surfaces of the sensor and the frame. The cover includes an upper cover part covering the upper surface of the frame in a state in which a space is formed between the upper cover part and the sensor; a lateral cover part extending from an outer edge of the upper cover part and covering an outer peripheral surface of the frame in a state in which a space is formed between the lateral cover part and an outer peripheral surface of the frame; and a lower cover part, extending from a lower end of the lateral cover part to an inner peripheral side and covering a lower surface of the frame. The frame includes: a covered part covered in a state of being contacted by the upper cover part; and a sensor installation part which is located on an outer peripheral side with respect to the covered part and to which the sensor is installed. The upper cover part includes a protrusion which protrudes toward the sensor and in which a lower surface is parallel to an upper surface of the sensor installation part. The upper surface of the sensor installation part tilts downward toward an outer peripheral side at a slope greater than that of an upper surface of the covered part, and an interval between the upper surface of the sensor installation part and the lower surface of the upper cover part is formed to gradually increase from an inner peripheral side toward the outer peripheral side.
Another aspect of the invention provides a striking detection method for an electronic cymbal. The electronic cymbal includes: a plate-like frame; a sensor installed to an upper surface on an outer edge side of the frame; and a cover covering upper surfaces of the sensor and the frame. The cover includes: an upper cover part covering the upper surface of the frame in a state in which a space is formed between the upper cover part and the sensor; a lateral cover part extending from an outer edge of the upper cover part and covering an outer peripheral surface of the frame in a state in which a space is formed between the lateral cover part and an outer peripheral surface of the frame; and a lower cover part, extending from a lower end of the lateral cover part to an inner peripheral side and covering a lower surface of the frame. The upper cover part or the frame includes a stopper facing the space between the upper cover part and the sensor. The striking detection method includes: at the time of striking an outer edge of the cover, limiting deformation of the upper cover part toward an inner peripheral side by the stopper and detecting striking to the cover by pressing the sensor by the upper cover part deformed with the stopper as a fulcrum.
Another aspect of the invention provides a striking detection method for an electronic cymbal. The electronic cymbal includes: a plate-like frame; a sensor installed to an upper surface on an outer edge side of the frame; and a cover covering upper surfaces of the sensor and the frame. The cover includes: an upper cover part covering the upper surface of the frame in a state in which a space is formed between the upper cover part and the sensor; a lateral cover part extending from an outer edge of the upper cover part and covering an outer peripheral surface of the frame in a state in which a space is formed between the lateral cover part and an outer peripheral surface of the frame; and a lower cover part, extending from a lower end of the lateral cover part to an inner peripheral side and covering a lower surface of the frame. The frame includes: a covered part covered in a state of being contacted by the upper cover part; and a sensor installation part which is located on an outer peripheral side with respect to the covered part and to which the sensor is installed. The upper cover part includes a protrusion which protrudes toward the sensor and in which a lower surface is parallel to an upper surface of the sensor installation part. The upper surface of the sensor installation part tilts downward toward an outer peripheral side at a slope greater than that of an upper surface of the covered part, and an interval between the upper surface of the sensor installation part and the lower surface of the upper cover part is formed to gradually increase toward the outer peripheral side. The striking detection method includes: at the time of striking the outside of the cover, suppressing the upper cover part and the lateral cover part from contacting an outer edge of the sensor installation part, and detecting striking to the cover by pressing the sensor by the protrusion displaced together with deformation of the upper cover part.
In
In
The invention provides an electronic cymbal and a striking detection method capable of facilitating the sensor sensitivity with respect to the striking from the lateral direction.
Hereinafter, several embodiments will be described with reference to the accompanying drawings. Firstly, the overall configuration of an electronic cymbal 1 is described with reference to
As shown in
The frame 2 is a frame made of resin and including a bell frame 20 that simulates the shape of a bell of the cymbal and a bow frame 21 that simulates the shape of a bow of the cymbal. The bell frame 20 is formed in a bowl shape tilting downward from the central side thereof toward the outer peripheral side, and the bow frame 21 extends from the outer edge of the bell frame 20 toward the outer peripheral side (the outer side in the left-right direction).
The bow frame 21 gradually tilts downward with respect to the bell frame 20 toward the outer peripheral side, and the frame 2 as a whole is formed in a substantially disc shape by integrally forming the bell frame 20 and the bow frame 21.
A through hole 22 is formed at the center of the bell frame 20, and an inner wall part 30 of a case 3 is caught to the through hole 22. The inner wall part 30 is formed in a substantially cylindrical shape, and the inner peripheral side of the inner wall part 30 (the inner side in the left-right direction) is blocked by a disc-shaped support part 32 having a through hole 31 at the center. A rod (not shown) for supporting the electronic cymbal 1 is inserted into the through hole 31 of the support part 32.
A bottom wall part 33 extends from the lower end of the inner wall part 30 toward the outer peripheral side. By fixing the outer edge of the bottom wall part 33 to the lower surface of the frame 2 (the bow frame 21), a space surrounded by the frame 2 and the case 3 is formed on the lower surface side of the frame 2. Electronic components, such as a striking sensor (not shown), a substrate (not shown) etc., installed to the lower surface of the bell frame 20 is stored in the space. The striking sensor is a piezoelectric element detecting the vibration of the frame 2.
The upper surface of each of the bell frame 20 and the bow frame 21 is covered by a cover 4 made of rubber and having a through hole 40 at the center, and the cover 4 is formed in a shape (substantially disc shape) along each of the frames 20 and 21. A bell part sensor not shown herein is provided between the cover 4 and the bell frame 20, and the bell part sensor is a pressure sensor (e.g., a membrane switch) that is sheet-like and is ON/OFF when the cover 4 covering the bell frame 20 is struck.
The striking to the bell frame 20 is detected by the bell part sensor, and the striking to the bow frame 21 is detected by the striking sensor. In addition, as will be explicated in the following, the striking to the edge (outer edge) portion of the bow frame 21 is detected by an edge sensor 5. The striking detected by each sensor is converted into an electrical signal and output to a sound source device not shown herein. Accordingly, a musical sound in accordance with a striking position to the electronic cymbal 1 is generated.
Then, referring to
In addition, normal striking refers to striking to the outer edge of an upper cover part 41 from the top in a state in which a stick S is slanted (at an angle close to being horizontal), and striking from the lateral direction refers to striking to the outer edge portion of the upper cover part 41 from the lateral direction in a state in which the stick S is upright (at an angle close to the vertical direction). In addition, each configuration of the electronic cymbal 1 described in the following is formed to be continuous in the peripheral direction. However, a portion of the configuration may also be intermittent in the peripheral direction.
As shown in
The upper cover part 41 is bonded to the upper surface of the bow frame 21 by a double-side tape 6, and the upper surface of the bonding part 44 is bonded to the lower surface of the bow frame 21 by an adhesive. Meanwhile, on the outer peripheral side with respect to these bonded portions, neither of the upper cover part 41, the lateral cover part 42, and the lower cover part 43 is bonded to the bow frame 21.
As described in the following, within the bow frame 21, a portion bonded to the upper cover part 41 (i.e., a portion covered in a state of being contacted by the upper cover part 41) is described as a covered part 21a.
A bent part 21b is bent downward from the outer edge of the covered part 21a, an overhang part 21c overhangs from the lower end of the bent part 21b toward the outer peripheral side. In addition, a sensor installation part 21d extends from the upper end on the outer edge side of the overhang part 21c to the outer peripheral side. By integrally forming the respective parts of the covered part 21a, the bent part 21b, the overhang part 21c, and the sensor installation part 21d, the edge portion of the bow frame 21 is formed.
The edge sensor 5 is bonded to the upper surface of the sensor installation part 21d, and the edge sensor 5 is also a sheet-like pressure sensor (e.g., a membrane switch) like the bell part sensor. The upper cover part 41 covers the bow frame 21 in a state in which a space S1 is formed between the upper cover part 41 and the edge sensor 5 (the sensor installation part 21d).
A protrusion 45 protruding toward the edge sensor 5 (downward) is integrally formed on the lower surface of the upper cover part 41. The protrusion 45 is a portion pressing the edge sensor 5 at the time when the outer edge portion of the upper cover part 41 is struck.
A stopper 46 integrally formed with the upper cover part 41 is provided on the inner peripheral side with respect to the protrusion 45. The stopper 46 is a protrusion protruding downward from the upper cover part 41 and inserted into a recess part 21e formed on the upper surface of the bow frame 21. The recess part 21e is a groove formed by the bent part 21b, the overhang part 21c, and the sensor installation part 21d of the bow frame 21.
In a state before the upper cover part 41 is struck (referred to as “pre-striking state” in the following), the stopper 46 and the bottom surface of the recess part 21e are in contact with each other or slightly separated (less than a gap between the protrusion 45 and the edge sensor 5).
Accordingly, as shown in (a) of
As the upper cover part 41 deforms downward, the lateral cover part 42 and the lower cover part 43 deform downward so as to be separated from the bow frame 21 (the overhang part 21c and the sensor installation part 21d). This is because, as described above, the lateral cover part 42 and the lower cover part 43 are not bonded to the bow frame 21 on the outer peripheral side with respect to the bonding part 44.
Through the downward deformation of the respective cover parts 41, 42, and 43, the protrusion 45 is pressed to the edge sensor 5, and the striking to the cover 4 (the upper cover part 41) by the stick S is detected by the edge sensor 5.
Meanwhile, as shown in (b) of
In addition, in the pre-striking state (the state of
Moreover, with the deformation of the upper cover part 41 toward the inner peripheral side being limited by the stopper 46, the force applied to the bonding portion (the double-side tape 6) between the covered part 21a and the upper cover part 41 can be reduced. Accordingly, the upper cover part 41 can be prevented from being peeled off from the covered part 21a.
In addition, a bonding position P1 between the bonding part 44 and the lower surface of the bow frame 21 is located on the inner peripheral side with respect to the stopper 46, and neither of the lateral cover part 42 and the lower cover part 43 is bonded to the bow frame 21 on the outer peripheral side with respect to the bonding position P1. Accordingly, in both (referred to as “striking from the respective directions” in the following) of the normal striking (see (a) of
In addition, although the lower cover part 43 is also deformed at the time of being struck from the lateral direction, the deformation of the lower cover part 43 is limited by a protrusion part 21f. The protrusion part 21f protrudes downward from the lower surface of the bow frame 21, and the bonding part 44 is inserted between a protrusive portion formed by the bent part 21b, the overhang part 21c, and the sensor installation part 21d on the lower surface of the bow frame 21 and the protrusion part 21f.
Accordingly, since the deformation of the lower cover part 43 and the bonding part 44 toward the inner peripheral side at the time of being struck from the lateral direction (see (b) of
In addition, in order to easily deform the upper cover part 41 by setting the stopper 46 as the fulcrum, a thin part 47 is formed at the upper cover part 41. More specifically, except for regions in which the protrusion 45 and the thin part 47 are formed, the thickness of the upper cover part 41 is substantially constant in regions on the outer peripheral side with respect to the stopper 46. Here, “being substantially constant” means that, compared with the averaged thickness of the upper cover part 41 in such regions, the minimum thickness and the maximum thickness of the upper cover part 41 are within ±10% of the averaged thickness. Meanwhile, in the region in which the thin part 47 is formed, the thickness of the upper cover part 41 is thinner than other regions, and the thickness of the upper cover part 41 is gradually reduced toward the stopper 46.
By forming such thin part 47 in an adjacent portion to the outer peripheral surface of the stopper 46, at the time of being struck from the respective directions (see (a) and (b) of
In this way, although the deformation of the upper cover part 41 toward the inner peripheral side is limited by the stopper 46 formed at the upper cover part 41 in the embodiment, the deformation of the upper cover part 41 toward the inner peripheral side can also be limited even in a configuration in which a stopper 221g protruding upward from a bow frame 221 is fit to a recess part 249 of a cover 204 in a second embodiment (see (a) of
Comparatively, in the embodiment, it is configured that the bent part 21b bent downward from the outer edge of the covered part 21a is formed at the bow frame 21, the stopper 46 located on the outer peripheral side of the bent part 21b is formed at the upper cover part 41, and the deformation of the upper cover part 41 toward the inner peripheral side is limited by the bent part 21b and the stopper 46. Accordingly, compared with the configuration in which the stopper 221g of the bow frame 221 is inserted into the recess part 249 of the cover 204 as in the second embodiment, the thickness of the cover 4 is ensured, and the overall thickness of the bow frame 21 and the cover 4 can be reduced. Accordingly, the electronic cymbal 1 can be in a shape similar to the cymbal.
Here, the deformation of the upper cover part 41 toward the inner peripheral side can be generally limited by the stopper 46. However, at the time of being struck strongly from the lateral direction, for example, the protrusion 45 of the upper cover part 41 is displaced toward the inner peripheral side (the inner side along the left-right direction) instead of being displaced downward. In the case where the protrusion 45 is displaced toward the inner peripheral side, the closer the angle of the upper surface of the sensor installation part 21d (the edge sensor 5) is to being horizontal, the more likely the edge sensor 5 is pressed insufficiently by the protrusion 45.
Comparatively, in the embodiment, the upper surface of the sensor installation part 21d (the edge sensor 5) and the lower surface of the protrusion 45 are formed to be parallel, and the respective surfaces tilt downward toward the outer peripheral side at a slope greater than that of the upper surface of the covered part 21a. Accordingly, a larger angle of the upper surface of the sensor installation part 21d (the edge sensor 5) with respect to the left-right direction (horizontal direction) can be ensured. Thus, even in the case where the protrusion 45 is displaced toward the inner peripheral side due to the striking from the lateral direction, the edge sensor 5 is easily pressed by the protrusion 45. Therefore, the sensitivity of the edge sensor 5 with respect to the striking from the lateral direction can be facilitated.
In addition, the slope of the upper surface of the sensor installation part 21d is greater than that of the upper surface of the covered part 21, whereas the lower surface of the upper cover part 41 (the portion without the protrusion 45 and the thin part 47) is parallel to the upper surface of the covered part 21a. That is, the lower surface of the upper cover part 41 tilts downward toward the outer peripheral side at a slope less than that of the upper surface of the sensor installation part 21d.
Accordingly, an interval between the upper surface of the sensor installation part 21d and the lower surface of the upper cover part 41 is gradually increased from the inner peripheral side to the outer peripheral side. Therefore, a connection position P2 between the upper cover part 41 and the lateral cover part 42 can be away from the outer edge of the sensor installation part 21d. Thus, at the time of being struck from the lateral direction, the upper cover part 41 and the lateral cover part 42 can be suppressed from contacting the outer edge portion of the sensor installation part 21d. Accordingly, since the protrusion 45 is easily pressed to the edge sensor 5, the sensitivity of the edge sensor 5 with respect to the striking from the lateral direction can be facilitated.
In this way, in the embodiment, by limiting the deformation of the upper cover part 41 toward the inner peripheral side by the stopper 46, or by increasing the slope of the upper surface of the sensor installation part 21d (the edge sensor 5), the sensitivity of the edge sensor 5 with respect to the striking from the lateral direction can be facilitated.
Comparatively, referring to a third embodiment (see (b) of
Comparatively, in the embodiment, it is configured that the overhang part 21c which overhangs from the lower end of the bent part 21b toward the outer peripheral side is provided, and the sensor installation part 21d is provided at the upper end part on the outer edge side of the overhang part 21c. In this way, compared with the configuration in which the overhang part 21c is omitted, the arrangement (height) of the sensor installation part 21d can be increased. Therefore, the significant downward protrusion of the sensor installation part 21d can be suppressed. Accordingly, the thickness of the edge portion of the bow frame 21 can be reduced, and the electronic cymbal 1 can be in a flat shape like the cymbal.
Here, in addition to the function of detecting the striking to the upper cover part 41, the edge sensor 5 is also provided with a function of detecting a choke playing technique in which the performer grabs the edge portion of the bow frame 21. A conventional process may be adopted for the process of distinguishing between the striking to the upper cover part 41 and the choke playing technique. Therefore, details in this regard will be omitted. As a conventional process, a process described in para. 0005 to 0008 of Japanese Laid-open No. H06-035450, etc., may serve as an example.
In such choke playing technique, as described above, the performer grabs the edge portion of the bow frame 21. In such case, when the sensor installation part 21d is provided at the upper end part on the outer edge side of the overhang part 21c, a step difference is formed in the connection portion between the overhang part 21c and the sensor installation part 21d, and a space S2 (see
Comparatively, the lower cover part 43 of the embodiment includes a contact part 48 which fills a portion of the step difference formed by the overhang part 21c and the sensor installation part 21d. The contact part 48 is a protrusion integrally formed with the upper surface of the lower cover part 43, and contacts the lower surface of the sensor installation part 21d in the pre-striking state (the state shown in (a) and (b) of
To provide the hard feeling close to the cymbal, the space S2 may be completely filled by the contact part 48. However, when the space S2 is completely filled by the contact part 48, due to a dimension error of the frame 2 or the cover 4, it is difficult to properly fit the contact part 48 to the step difference portion between the overhang part 21c and the sensor installation part 21d. In addition, when the space S2 is completely filled by the contact part 48, the deformation of the upper cover part 41 is obstructed by the catching between the overhang part 21c and the contact part 48, and it is difficult to press the protrusion 45 to the edge sensor 5.
Comparatively, in the embodiment, a gap is formed between the overhang part 21c and the contact part 48, and a portion of the space S2 is left. Accordingly, even if a dimension error occurs in the frame 2 or the cover 4, the contact part 48 can still be properly fit to the step difference portion between the overhang part 21c and the sensor installation part 21d. Therefore, the assemblability of the cover 4 can be facilitated. Moreover, since the space S2 is left, at the time of being struck from the respective directions (see (a) and (b) of
In addition, as described above, although the stopper 46 is inserted into the recess part 21e, a gap is also formed between stopper 46 and the wall surface on the outer peripheral side of the recess part 21e (the sensor installation part 21d) in the pre-striking state. Accordingly, even if a dimension error occurs in the frame 2 or the cover 4, the stopper 46 can be properly inserted into the recess part 21e. Therefore, the assemblability of the cover 4 can be facilitated.
Then, the electronic cymbal 201 of the second embodiment is described with reference to (a) of
As shown in (a) of
The stopper 221g protrudes upward from the bow frame 221, and is inserted into the recess part 249 formed on the lower surface of the upper cover part 41. Accordingly, at the time of being struck from the lateral direction, through the catching between the stopper 221g and the recess part 249, the deformation of the upper cover part 41 toward the inner peripheral side can be limited. Thus, since the upper cover part 41 and the lateral cover part 42 can be suppressed from contacting the sensor installation part 21d at the time of being struck from the lateral direction, the protrusion 45 is easily pressed to the edge sensor 5.
Also, in the pre-striking state (the state of (a) of
Also, like the first embodiment, the upper surface of the sensor installation part 21d (the edge sensor 5) and the lower surface of the protrusion 45 are formed to be parallel, and the angles of the respective surfaces provide slopes greater than the upper surface of the covered part 21a. Accordingly, the angle of the upper surface of the sensor installation part 21d (the edge sensor 5) with respect to the horizontal direction can be increased. Thus, even if the protrusion 45 is displaced toward the inner peripheral side due to the striking from the lateral direction, the edge sensor 5 is easily pressed by the protrusion 45.
In addition, since an interval between the sensor installation part 21d and the upper cover part 41 is gradually increased toward the outer peripheral side, the connection position P2 between the upper cover part 41 and the lateral cover part 42 can be away from the outer edge of the sensor installation part 21d. Thus, since the upper cover part 41 and the lateral cover part 42 can be suppressed from contacting the sensor installation part 21d at the time of being struck from the lateral direction, the protrusion 45 is easily pressed to the edge sensor 5. Accordingly, the sensitivity of the edge sensor 5 with respect to the striking from the lateral direction can be facilitated.
Then, an electronic cymbal 301 of the third embodiment is described with reference to (b) of
As shown in (b) of
In addition, the cover part 304 has the same configuration as the cover 4 of the first embodiment, except for the point that the upper cover part 41 (a portion on the outer peripheral side with respect to the stopper 46) or the protrusion 45 is formed to be thicker and the point that the lower cover part 43 omitting the contact part 48 (see
Even in the embodiment, due to the catching between the stopper 46 and the bent part 21b, the deformation of the upper cover part 41 toward the inner peripheral side can be limited at the time of being struck from the lateral direction. In this way, since the upper cover part 41 and the lateral cover part 42 can be suppressed from contacting the outer edge portion of the sensor installation part 21d at the time of being struck from the lateral direction, the protrusion 45 is easily pressed to the edge sensor 5.
In addition, in the pre-striking state (the state of (b) of
Also, like the first embodiment, the upper surface of the sensor installation part 21d (the edge sensor 5) and the lower surface of the protrusion 45 are formed to be parallel, and the angles of the respective surfaces provide slopes greater than the upper surface of the covered part 21a. Accordingly, a larger angle of the upper surface of the sensor installation part 21d (the edge sensor 5) with respect to the horizontal direction can be ensured, and thus even if the protrusion 45 is displaced toward the inner peripheral side due to the striking from the lateral direction, the edge sensor 5 is easily pressed by the protrusion 45.
In addition, since an interval between the sensor installation part 21d and the upper cover part 41 is gradually increased toward the outer peripheral side, the connection position P2 between the upper cover part 41 and the lateral cover part 42 can be away from the outer edge of the sensor installation part 21d. Thus, since the upper cover part 41 and the lateral cover part 42 can be suppressed from contacting the sensor installation part 21d at the time of being struck from the lateral direction, the protrusion 45 is easily pressed to the edge sensor 5. Accordingly, the sensitivity of the edge sensor 5 with respect to the striking from the lateral direction can be facilitated.
Although the above description has been made based on the embodiments, the invention is not limited to the embodiments, and it can be easily inferred that various improvements and modifications can be made without departing from the spirit of the invention.
In the respective embodiments, a configuration in which the frame 2 includes the disc-shaped bell frame 20 and the bow frame 21, 221, and 321, that is, the case in which the electronic cymbal 1, 201, 301 is an electronic percussion instrument simulating the cymbal, is described. However, the invention is not limited thereto. For example, the invention may also be applicable to an edge portion of another disc-shaped electronic percussion instrument. In addition, the outer shape of the frame 2 is not limited to being circular (disc-shaped). For example, the outer shape of the frame 2 may also be polygonal.
In the respective embodiments, the case where the lower surface of the protrusion 45 of the upper cover part 41 is parallel to the upper surface of the sensor installation part 21d (the edge sensor 5) is described. However, the invention is not limited thereto. For example, the slope of the lower surface of the protrusion 45 may also be configured as being greater or less than that of the upper surface of the sensor installation part 21d (the edge sensor 5), and the protrusion 45 may also be omitted.
In the respective embodiments, the case where the slope of the upper surface of the sensor installation part 21d (the edge sensor 5) is greater than the upper surface of the covered part 21a is described. However, the invention is not limited thereto. For example, the slope of the upper surface of the sensor installation part 21d may also be configured as being the same as or less than the slope of the upper surface of the covered part 21a.
In the respective embodiments, the configuration in which the interval between the sensor installation part 21d (the edge sensor 5) and the upper cover part 41 is gradually increased is described. However, the invention is not limited thereto. For example, the interval between the sensor installation part 21d (the edge sensor 5) and the upper cover part 41 may also remain the same or be gradually decreased from the inner peripheral side to the outer peripheral side.
In the respective embodiments, the case where the bonding position P1 between the bow frame 21, 221, 321 and the bonding part 44 is located on the inner peripheral side with respect to the stopper 46, 221g is described. However, the invention is not limited thereto. For example, the bonding position P1 may also be located on the outer peripheral side with respect to the stopper 46, 221g, the bonding part 44 may be omitted, and the inner edge of the lower cover part 43 is directly bonded to the lower surface of the bow frame 21, 221, 321.
In the respective embodiments, the case where the upper cover part 41 or the bow frame 221 (the frame 2) includes the stopper 46, 221g limiting the deformation of the upper cover part 41 toward the inner peripheral side is described. However, the invention is not limited thereto. For example, the stopper 46, 221g may be omitted.
In the first and second embodiments, a portion of the step difference portion (the space S2) between the overhang part 21c and the sensor installation part 21d is filled by the contact part 48. However, the invention is not limited thereto. For example, the contact part 48 may also completely fill the step difference portion (the space S2), or the contact part 48 may also be omitted.
Although omitted in the description of the first and third embodiments, the stopper 46 may contact the wall surface (the outer peripheral surface of the bent part 21b) of the recess part 21e in the pre-striking state. However, the wall surface (the outer peripheral surface of the bent part 21b) on the inner peripheral side of the recess part 21e and the stopper 46 may be separated from the stopper 46 as long as the pressing to the edge sensor 5 by the protrusion 45 does not become insufficient.
Although the first embodiment describes the case where a gap is formed between the sensor installation part 21d and the stopper 46, the invention is not limited thereto. For example, the sensor installation part 21d and the stopper 46 may also be connected with each other in the pre-striking state.
The first embodiment describes the case where the thickness of the upper cover part 41 in the thin part 47 is gradually reduced toward the stopper 46, but the invention is not limited thereto. For example, the thickness of the upper cover part 41 in the thin part 47 may also be constant. In addition, it may also be that the thin part 47 is omitted, and the thickness of the upper cover part 41 (the region where the protrusion 45 or the stopper 46 is not formed) may also remain constant. That is, if it is configured that the upper cover part 41 (the protrusion 45) can be deformed to the side of the edge sensor 5 by the stopper 46 as the fulcrum, the thickness of the upper cover part 41 can be set as appropriate.
It will be apparent to those skilled in the art that various modifications and variations can be made to the disclosed embodiments without departing from the scope or spirit of the disclosure. In view of the foregoing, it is intended that the disclosure covers modifications and variations provided that they fall within the scope of the following claims and their equivalents.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2022-054432 | Mar 2022 | JP | national |
