Electroencephalogram helmet

Abstract

The invention discloses an electroencephalogram helmet which comprises a bottom cover and a support, and the bottom cover is provided with a wiring space. The support and the bottom cover are connected to form an accommodating area for accommodating a head circumference adjusting mechanism, the support is provided with an accommodating groove and a wiring cavity, the accommodating groove is used for mounting a circuit board, and the wiring cavity is communicated with the accommodating groove and the wiring space.

Description

Technical Field

[0001] This invention relates to the field of electroencephalography (EEG) measurement technology, and in particular to an EEG helmet. Background Technology

[0002] Traditional EEG acquisition systems typically employ wet electrode technology, which requires injecting conductive gel between the electrodes and the scalp to reduce contact impedance and ensure signal quality. However, this technology has significant limitations: the preparation process is cumbersome and time-consuming, requiring professionals to position the electrodes and inject the gel, and the subject needs to wash their hair afterward, resulting in a poor experience. Furthermore, the conductive gel can easily dry out during prolonged acquisition, leading to increased contact impedance and decreased signal quality.

[0003] To overcome the shortcomings of wet electrode technology, dry electrode technology has emerged. Current dry electrode EEG helmets require multiple dry electrode heads and separate mounting locations for circuit boards, resulting in complex structures and inconvenient installation, necessitating improvement. Summary of the Invention

[0004] The purpose of this invention is to provide an EEG helmet to solve the problems of the prior art.

[0005] To address the aforementioned technical problems, embodiments of the present invention provide an EEG helmet, comprising: The bottom cover has a wiring space; The bracket and the bottom cover are connected to form a receiving area for accommodating the head circumference adjustment mechanism. The bracket is provided with a receiving groove and a wiring cavity. The receiving groove is used to install a circuit board, and the wiring cavity is in communication with the receiving groove and the wiring space.

[0006] In one embodiment, the bracket includes a fixed shaft, and the wiring cavity is disposed within the fixed shaft; A portion of the head circumference adjustment mechanism is rotatably connected to the fixed shaft; The receiving slot is located at the top of the bracket.

[0007] In one embodiment, the head circumference adjustment mechanism includes: Two racks are arranged opposite to each other, and the two racks are movably connected to the bottom cover; Two adjusting belts, each of which is connected to one of the two racks; A transmission mechanism, which is rotatably connected to the fixed shaft and meshes with the two racks; A knob, which is rotatably connected to the bracket and drively connected to the transmission mechanism, and can switch between a rotating state and a locked state; In the rotating state, the knob can drive the transmission mechanism to rotate clockwise or counterclockwise, thereby driving the two racks to move the opposite ends of the two adjusting belts closer to or further away from each other; In the locked state, the limiting part abuts against the transmission mechanism, restricting the rotation of the transmission mechanism.

[0008] In one embodiment, the transmission mechanism includes: A first transmission gear meshes with the internal gear of the knob; The second transmission gear is rotatably connected to the fixed shaft and meshes with the first transmission gear. A transmission component, which is rotatably connected to the fixed shaft and connected to the second transmission gear, and meshes with the two racks; In the rotating state, the knob can drive the first transmission gear, the second transmission gear, and the transmission component to rotate clockwise or counterclockwise; In the locked state, the limiting part abuts against the transmission member, restricting the rotation of the transmission mechanism.

[0009] In one embodiment, the bottom cover is provided with an inner toothed groove, and the limiting part is a plurality of limiting teeth disposed on the inner wall of the inner toothed groove; The transmission component includes: A rack and pinion wheel, wherein the rack and pinion wheel is rotatably connected to the fixed shaft and meshes with two racks, and a ratchet is provided on the radially outer side of the rack and pinion wheel, wherein the ratchet is provided with a drive groove, and the drive groove extends circumferentially; A drive button, a portion of which is located within the internal tooth groove and rotatably connected to the fixed shaft, is connected to the second transmission gear, and has protruding teeth located within the drive groove; In the locked state, the ratchet abuts against the limiting tooth; In the rotating state, the knob can sequentially drive the first transmission gear, the second transmission gear, and the drive knob to rotate clockwise or counterclockwise. The protruding teeth slide along the drive groove and cause the ratchet to disengage from the limiting teeth, thereby driving the rack and pinion wheel to rotate. The rack and pinion wheel drives the two racks to rotate.

[0010] In one embodiment, the second transmission gear is provided with an embedded groove; The drive button has nested teeth located within the embedded slot.

[0011] In one embodiment, the drive button includes: A rotating drum, which is rotatably connected to the fixed shaft and has the nested teeth on its top surface; A turntable, which is fitted over the rotating cylinder and has protruding teeth on its top surface; The rack and pinion wheel is sleeved outside the rotating drum; The ratchet is located on the top surface of the turntable; The second transmission gear abuts against the top surface of the rack and pinion wheel.

[0012] In one embodiment, the inner radial end of the ratchet is connected to the rack and pinion wheel, and the outer radial end protrudes outward in a radial direction and abuts against the limiting tooth.

[0013] In one embodiment, the two ratchet wheels are connected to the rack and pinion wheel and are each provided with the drive groove; The top surface of the turntable is provided with two protruding teeth, which are located in the two drive slots respectively.

[0014] In one embodiment, the EEG helmet further includes a dry electrode head assembly, the dry electrode head assembly comprising: A housing, which is connected to the bottom cover and is provided with clearance holes; A dry electrode head, which passes through the clearance hole and is rotatably connected to the housing.

[0015] In one embodiment, the EEG helmet further includes a dry electrode head assembly, the dry electrode assembly comprising: A housing, wherein the housing is connected to the bottom cover and the housing has a clearance hole on its inner side along a first direction; A dry electrode head, which passes through the clearance hole and is movable along the first direction; A biasing element is connected to the housing and operably drives the dry electrode head to move along the first direction away from the outside of the housing.

[0016] In one embodiment, the EEG helmet includes a rear cover and a front cover; At least one of the dry electrode head assemblies is connected to the rear cover, and at least one other dry electrode head assembly is connected to the front cover; The head circumference adjustment mechanism is connected to one of the back cover and the front cover, and the two adjustment straps are connected to the other of the back cover and the front cover. Attached Figure Description

[0017] Figure 1 , Figure 2 , Figure 3 and Figure 4 These are perspective views of an EEG helmet according to an embodiment of the present invention.

[0018] Figure 5 and Figure 6 yes Figure 1An exploded view of the dry electrode head assembly in the illustrated embodiment.

[0019] Figure 7 yes Figure 5 A cross-sectional view of the dry electrode head assembly along a first direction in the illustrated embodiment.

[0020] Figure 8 , Figure 9 , Figure 10 and Figure 11 yes Figure 5 Assembly diagram of the dry electrode head assembly in the illustrated embodiment.

[0021] Figure 12 and Figure 13 yes Figure 5 Figure 5 The cross-sectional view of the dry electrode head assembly along the first direction in the illustrated embodiment shows different states of elastic compression.

[0022] Figure 14 and Figure 15 yes Figure 1 An exploded view of the EEG helmet in the illustrated embodiment.

[0023] Figure 16 yes Figure 1 The illustrated embodiment shows a cross-sectional view of the bottom cover, back cover, and head circumference adjustment mechanism.

[0024] Figure 17 yes Figure 1 The illustrated embodiment shows an assembly diagram of the bottom cover, drive button, and rack and pinion wheel.

[0025] Figure 18 yes Figure 1 The diagram shows the organization of the back cover and head circumference adjustment mechanism in the illustrated embodiment.

[0026] Figure 19 yes Figure 18 Cross-sectional view of the rear cover and head circumference adjustment mechanism along line AA.

[0027] Figure 20 yes Figure 1 A perspective view of the bottom cover in the illustrated embodiment.

[0028] Figure 21 yes Figure 1 A perspective view of the bracket in the illustrated embodiment.

[0029] Figure 22 yes Figure 1 Assembly diagram of the bottom cover and bracket in the embodiment shown.

[0030] Figure 23 yes Figure 22 The illustrated embodiment shows a cross-sectional view of the bottom cover and bracket along line BB.

[0031] Reference numerals: 100, EEG helmet; 1, top cover; 2, front cover; 3, dry electrode head assembly; 31, shell; 311, inner shell; 312, outer shell; 3121, clearance hole; 3122, mounting slot; 3123, window; 32, dry electrode head; 321, comb-like teeth; 322, convex part; 33, spring; 34, fastener; 341, snap fastener; 342, fixing part; 343, concave part; 344, protrusion; 35, snap-fit ​​part; 351, slide groove; 352, locking block; 36, inner frame; 361, guide post; 362, slot; 363, tear hole; 364, limiting part; 365, abutment part; 37, outer frame; 371, frame body; 372, roller; 373, limiting groove; 38, contact circuit board; 39, limiting 391. Flange; 4. Head circumference adjustment mechanism; 41. Bottom cover; 411. Inner tooth groove; 412. Limiting tooth; 413. Cable routing space; 42. Bracket; 421. Top plate; 422. Fixed shaft; 423. Cable routing cavity; 424. Receiving groove; 43. Knob; 44. First transmission gear; 45. Second transmission gear; 451. Embedded groove; 46. Drive button; 461. Rotary drum; 462. Turntable; 463. Nested tooth; 464. Protruding tooth; 47. Rack and pinion wheel; 471. Ratchet; 472. Drive groove; 473. Radial inner sidewall; 474. Ratchet; 475. Arc section; 476. Guide section; 48. Rack; 49. Adjustment belt; 5. Protective belt; 6. Circuit board; 61. Signal amplifier connector; 7. Cable; Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the various embodiments of this invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this invention to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0033] Unless the context requires otherwise, throughout the specification and claims, the word “comprising” and its variations, such as “including” and “having”, shall be understood to have an open, inclusive meaning, that is, to be interpreted as “including, but not limited to”.

[0034] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings to provide a clearer understanding of the purpose, features, and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative of the essential spirit of the technical solution of the present invention.

[0035] Throughout this specification, references to "an embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Therefore, the appearance of "in an embodiment" or "an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic may be combined in any manner in one or more embodiments.

[0036] The singular forms “a” and “the” used in this specification and the appended claims include plural references unless otherwise expressly stated herein. It should be noted that the term “or” is generally used to mean “and / or” unless otherwise expressly stated herein.

[0037] In the following description, in order to clearly demonstrate the structure and working method of the present invention, a number of directional terms will be used. However, terms such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and not as limiting terms.

[0038] This invention relates to an EEG helmet 100 for EEG data acquisition. The helmet 100 includes a rear cover, a front cover 2, a plurality of dry electrode heads assemblies 3 mounted on the rear and front covers 2, a head circumference adjustment mechanism 4 mounted on the rear cover, and a protective strap 5. Both the rear and front covers 2 are arc-shaped. The front cover 2 is positioned in front of the patient's head near the forehead, and the rear cover is positioned behind the patient's head near the back of the head. The head circumference adjustment mechanism 4 connects the rear and front covers 2 and is used to adjust the distance between them to accommodate different head circumferences. The two ends of the protective strap 5 are connected to the head circumference adjustment mechanism 4 and are used to hang on the patient's chin, making the EEG helmet 100 more stable. The protective strap 5 is equipped with an adjustment buckle for adjusting its length.

[0039] In one specific embodiment, such as Figure 1-4 As shown, the rear cover is provided with three dry electrode head assemblies 3, while the front cover 2 is roughly U-shaped, with three dry electrode head assemblies 3 in the middle and two dry electrode head assemblies 3 on each side.

[0040] Preferably, the dry electrode head assembly 3 includes a housing 31, a dry electrode head 32, and a biasing member. The housing 31 is part of the front cover 2 or the rear cover. Alternatively, in other embodiments, the housing 31 may be a separate part connected to the front cover 2 and the rear cover. The housing 31 includes an inner shell 311 and an outer shell 312 connected to each other along a first direction. The outer shell 312 and the inner shell 311 are fixedly connected by a plurality of screws, forming a space to accommodate the dry electrode head 32.

[0041] The inner side of the dry electrode head 32 is located inside the housing 31, and the outer side is provided with multiple comb-like teeth. The multiple comb-like teeth are located outside the housing 31 and are used to contact the patient's scalp to use electroencephalogram (EEG) signals.

[0042] exist Figure 1-4 In the embodiment shown, the inner shell 311 and the outer shell 312 are part of the front cover, with the outer shell 312 being closer to the patient's scalp than the inner shell 311.

[0043] Optionally, the outer casing 312 is provided with a clearance hole 3121 to allow the dry electrode head 32 to pass through, facilitating the movement of the dry electrode head 32 along the first direction. The inner portion of the dry electrode head 32 along the first direction is located within the space between the outer casing 312 and the inner casing 311, while multiple dry electrode heads 32 on the outer side pass through the clearance hole 3121 for contacting the patient's scalp to collect EEG information.

[0044] The biasing element is located within the space formed by the outer shell 312 and the inner shell 311 and is connected to the inner shell 311. One end of the biasing element abuts against the dry electrode head 32, causing the dry electrode head 32 to move away from the inner shell 311. In other words, the biasing element applies a force toward the patient's scalp to the dry electrode head 32, so that the dry electrode head 32 is in stable contact with the patient's scalp.

[0045] Preferably, the biasing element is a spring 33, which is connected to the dry electrode head 32 and the inner shell 311. The spring 33 is in a compressed state and has a force that drives the dry electrode head 32 to move away from the inner shell 311.

[0046] It should be understood that in other embodiments, the biasing element may also be configured as other elastic elements, or as two repulsive magnetic elements, which are respectively connected to the inner side of the dry electrode head 32 and the inner shell 311 and repel each other, and may also drive the dry electrode head 32 to move away from the inner shell 311.

[0047] exist Figure 5 , Figure 6 and Figure 7 In the illustrated embodiment, the dry electrode head assembly 3 further includes a fastener 34, which includes a snap fastener 341 and a fixing member 342. The snap fastener 341 engages with the inner side of the dry electrode head 32, and the fixing member 342 is fixed to the radial outer side of the snap fastener 341. Figure 5 and Figure 6 As shown, the snap fastener 341 has a concave portion 343 on the side facing the dry electrode head 32, while the inner side of the dry electrode head 32 has a convex portion 322. The convex portion 322 and the concave portion 343 can be perfectly fastened together.

[0048] One end of the spring 33 is looped around the snap 341 and is located between the fastener 342 and the snap 341, that is, the fastener 342 fixes the spring 33 to the outside of the snap 341.

[0049] In one specific embodiment, the inner side of the snap 341 is also provided with a protrusion 344, which is generally arc-shaped and the edge of the protrusion 344 is close to the radial outer side of the snap 341. The fastener 342 is annular and is arranged around the protrusion 344. The outer end of the spring 33 is arranged around the protrusion 344 and is located on the radial inner side of the fastener 342. That is to say, the outer end of the spring 33 is clamped and fixed by the fastener 342 and the protrusion 344.

[0050] The dry electrode head assembly 3 also includes an inner frame 36 and a snap-fit ​​member 35. The inner frame 36 is an annular frame and the inner side of the inner frame 36 is located in the space formed by the outer shell 312 and the inner shell 311. The outer side passes through the clearance hole 3121 and can move along the first direction.

[0051] The inner wall of the inner frame 36 is provided with an abutment 365, which is an annular shape extending circumferentially and protruding from the inner wall of the inner frame 36, and is located approximately on the outer side of the inner frame 36.

[0052] After the fastener 34 and the dry electrode head 32 are fastened together, the fastener 34 is inserted into the inner frame 36 from the inner end of the inner frame 36, and the dry electrode head 32 extends out of the inner frame 36 from the outer end opening of the inner frame 36, while the snap 341 of the fastener 34 abuts against the abutting part 365.

[0053] The snap-fit ​​part 35 is ring-shaped and located inside the inner frame 36. The snap-fit ​​part 35 snaps into the inner frame 36. After the snap-fit ​​part 35 is installed, the outer radial side of the fastener 34 is clamped between the snap-fit ​​part 35 and the abutment part 365.

[0054] For ease of installation, the inner wall of the inner frame 36 is provided with two guide posts 361 extending axially. The two guide posts 361 are symmetrically arranged and extend from the inner end of the inner frame 36 to the abutment 365.

[0055] The snap-fit ​​35 and the fastener 342 are respectively provided with two sliding grooves 351 on their radial outer sides. When the snap-fit ​​35 and the fastener 34 are installed, the sliding grooves 351 slide along the guide post 361, which facilitates the positioning and installation of the snap-fit ​​35 and the fastener 34.

[0056] The inner wall of the inner frame 36 is also provided with two slots 362, which are symmetrically arranged. The outer radial side of the snap fastener 35 is provided with two protruding blocks 352, which are respectively snapped into the two slots 362.

[0057] Preferably, the inner frame 36 is also provided with a plurality of tear holes 363, which are arranged circumferentially to facilitate the installation of the inner frame 36.

[0058] The dry electrode head assembly 3 also includes a contact circuit board 38 and a limiting buckle 39. The contact circuit board 38 is located in the space formed by the inner shell 311 and the outer shell 312 and is fixedly connected to the outer shell 312 or the inner shell 311 by two bolts. The contact circuit board 38 does not move with the dry electrode head 32 in the first direction and is fixed on the shell 31. The contact circuit board 38 presses against the inner end of the spring 33 and is electrically connected to the inner end of the spring 33. The spring 33 is electrically connected to the buckle 34, and the buckle 34 is electrically connected to the dry electrode head 32. The spring 33 can also serve as a wire.

[0059] The contact circuit board 38 is also provided with a mounting hole, and the limiting buckle 39 passes through the mounting hole and is located at the inner end of the spring 33. The outer side of the limiting buckle 39 is also provided with a flange 391, which is located between the contact circuit board 38 and the inner shell 311. The limiting buckle 39 can prevent the spring 33 from disengaging from the contact circuit board 38.

[0060] The inner wall of the housing 312 is also provided with a recessed mounting groove 3122, and the clearance hole 3121 is formed by the inner wall of the mounting groove 3122 recessed to the outer side along the first direction. The dry electrode head assembly 3 also includes an outer frame 37, which is an annular frame and is located inside the mounting groove 3122 along the first direction, and extends out from the clearance hole 3121 on the outer side.

[0061] The inner frame 36 is located within the outer frame 37 and can move within the outer frame 37 along a first direction. Specifically, the outer frame 37 includes a frame body 371 and a roller 372. The frame body 371 is an annular frame that passes through the clearance hole 3121, while the roller 372 is fitted around the radially outer side of the frame body 371. The radially inner wall of the frame body 371 is also provided with a limiting groove 373 extending axially. The limiting groove 373 extends outward from the inner side of the outer frame 37 along the first direction by a predetermined distance. The radially outer wall of the inner frame 36 is also provided with a protruding limiting member 364. This limiting member 364 is located in the limiting groove 373 and can slide along the length direction of the limiting groove 373, that is, move along the first direction.

[0062] The axial width of the limiting groove 373 is limited. When the outer frame 37 is rotated, the limiting member 364 and the limiting groove 373 cooperate to drive the inner frame 36 and the dry electrode head 32 inside the inner frame 36 to rotate synchronously.

[0063] The outer casing 312 is also provided with a window 3123, which is formed by the radial sidewall of the mounting groove 3122 recessed to the outside. The roller 372 of the outer frame 37 is exposed at the window 3123 for easy rotation. Of course, the radial outer side of the roller 372 is provided with an arc surface with a certain roughness, such as threads or multiple pits, to facilitate rotation.

[0064] As can be seen from the above, the dry electrode head 32, the inner frame 36, the fixing member 342, the snap fastener 341, and the locking member 35 form a fixed whole. This whole can move axially within the outer frame 37, and the spring 33 provides an outward supporting force from the bottom, giving the whole a pressing and rebounding effect. This elastic force is used to maintain the contact pressure between the comb-like teeth of the dry electrode head 32 and the scalp. At the same time, the limiting member 364 on the inner frame 36 can realize the axial rotation linkage function between the outer frame 37 and the whole. When the outer frame 37 is installed in the housing 31, the roller 372 part of the outer frame 37 will be exposed. The patient can manually turn the roller 372 part, and through the rotation linkage, drive the dry electrode head 32 to rotate together. This allows the comb-like teeth 321 of the dry electrode head 32 to part the wearer's hair, and with the pressure provided by the spring 33, establish direct contact with the scalp through the gaps in the hair.

[0065] From the perspective of EEG signal transmission, the dry electrode head 32 itself has good conductivity. The EEG signal is first conducted from the dry electrode head 32 to the metal snap button 341, and then through the spring 33, which is in contact with the snap button 341 and has good conductivity, to the contact circuit board 38, which is in contact with the spring 33. In the whole structure, the spring 33 not only provides contact pressure, but also realizes the transmission of EEG signals through the slidable contact with the conductors at both ends.

[0066] By designing a rotatable structure with a retractable spring 33 on each dry electrode head 32, the wearer can rotate the roller 372 to allow the dry electrode head 32 to part the patient's hair and make direct contact with the scalp. The spring structure can establish appropriate contact pressure between the dry electrode head 32 and the scalp, thereby solving the problems of inadequate electrode contact and insufficient contact pressure, and improving signal quality.

[0067] The head circumference adjustment mechanism 4 is installed on the rear cover or front cover 2 and includes a bottom cover 41, a bracket 42, two racks 48 arranged opposite each other, two adjustment belts 49, a transmission mechanism and a knob 43.

[0068] The bottom cover 41 is part of the rear cover or the front cover 2, or the bottom cover 41 is an independent part and is fixedly connected to the front cover 2 or the rear cover. Figure 15 and 16 In the embodiment shown, the bottom cover 41 is part of the rear cover, and the rear cover also includes a top cover 1 that covers the top of the bottom cover 41. The top cover 1 and the bottom cover 41 are assembled to form the rear cover, and the top cover 1 covers the top surface of the bottom cover 41 and the bracket 42.

[0069] Two racks 48 are arranged side by side with their teeth facing each other. The front ends of two adjusting belts 49 are connected to the two racks 48 respectively, and the rear ends are rotatably connected to the front cover 2 respectively. When the two racks 48 move towards each other or in opposite directions, they can drive the two adjusting belts 49 to move closer or further apart, thereby adjusting the distance between the rear cover and the front cover 2.

[0070] The transmission mechanism meshes with the knob 43 and the rack 48 respectively. When the knob 43 rotates clockwise, it drives the transmission mechanism to rotate clockwise, causing the two racks 48 to move towards each other and tightening the two adjusting belts 49. Conversely, when the knob 43 rotates counterclockwise, the two adjusting belts 49 loosen. A limiting part is provided on the bottom cover 41, which is used to limit the rotation of the transmission mechanism when the knob 43 stops rotating.

[0071] In other words, knob 43 can switch between a rotating state and a locked state. In the rotating state, knob 43 can drive the transmission mechanism to rotate clockwise or counterclockwise, thereby driving the two racks 48 to move, causing the opposite ends of the two adjusting belts 49 to move closer or further apart. In the locked state, the limiting part abuts against the transmission mechanism, restricting the rotation of the transmission mechanism.

[0072] The bracket 42 is located on the top surface of the bottom cover 41 and is fixedly connected to the bottom cover 41. The bracket 42 is located between the bottom cover 41 and the top cover 1. The bracket 42 and the bottom cover 41 cooperate to accommodate the knob 43, the rack 48 and the transmission mechanism.

[0073] The bracket 42 includes a top plate 421 and a fixed shaft 422 located on the bottom surface of the top plate 421. The top plate 421 is fixedly connected to the bottom cover 41, and the fixed shaft 422 extends vertically and is located inside the bottom cover 41.

[0074] The knob 43 is rotatably mounted on the top plate 421 of the bracket 42, and the radial outer side of the knob 43 is exposed outside the bracket 42 and the back cover for rotation.

[0075] The bottom cover 41 is provided with an inner tooth groove 411, and the limiting part is a plurality of limiting teeth 412 provided in the inner tooth groove 411.

[0076] exist Figure 15 and Figure 16 In this embodiment, the transmission mechanism includes a first transmission gear 44, a second transmission gear 45, and a transmission component. The first transmission gear 44 is rotatably connected to a bracket 42, and a shaft for mounting the first transmission gear 44 is provided on the bracket 42. The first transmission gear 44 has two gears, wherein the gear located on the top surface meshes with the internal gear of the knob 43, and the gear located on the bottom surface meshes with the second transmission gear 45.

[0077] The second transmission gear 45 is rotatably connected to the fixed shaft 422.

[0078] The transmission components include a rack and pinion wheel 47 and a drive button 46. Both the rack and pinion wheel 47 and the drive button 46 are rotatably connected to the fixed shaft 422. The rack and pinion wheel 47 is located between two racks 48 and its external teeth mesh with the two racks 48 respectively.

[0079] The rack and pinion wheel 47 is fitted around the fixed shaft 422 and is rotatably connected to the fixed shaft 422.

[0080] Two ratchet wheels 471 are also provided on the radial outer side of the rack and pinion wheel 47. The two ratchet wheels 471 are arranged symmetrically with respect to the center of the rack and pinion wheel 47. Their inner ends are connected to the radial outer side of the rack and pinion wheel 47, and their radial outer ends extend circumferentially and gradually deviate from the radial outer side of the rack and pinion wheel 47.

[0081] The distance between the centers of the ratchet 471 and the rack and pinion wheel 47 gradually increases from the radial inner end to the outer end, and the radial outer end of the ratchet 471 is spaced apart from the rack and pinion wheel 47, giving the radial outer end of the ratchet 471 a certain degree of elasticity. The radial outer end of the ratchet 471 is provided with ratchet teeth 474. When the knob 43 is in the locked state, the ratchet teeth 474 of the ratchet 471 abut against the two adjacent limiting teeth 412, restricting the rotation of the rack and pinion wheel 47 and the drive knob 46.

[0082] The ratchet 471 is provided with a drive groove 472, which extends circumferentially along the ratchet 471. The drive groove 472 extends from the radial inner end of the ratchet 471 toward the radial outer end, and the radial inner sidewall 473 of the drive groove 472 is an arc surface. The distance between the radial inner sidewall 473 and the center of the rack and pinion wheel 47 gradually increases from the radial inner end to the radial outer end.

[0083] The radial outer surface of the ratchet 471 includes an arcuate segment 475 and a guide segment 476 connected to each other. The arcuate segment 475 extends circumferentially from the inner circumferential end of the ratchet 471, while the guide segment 476 extends circumferentially from the outer circumferential end of the ratchet 471 toward the inner radial end. The guide segment 476 is a straight segment and together with the arcuate segment 475, forms the radial outer surface of the ratchet 471.

[0084] The distance between the arc-shaped section 475 and the center of the rack and pinion wheel 47 gradually increases from the radial inner end to the outer end of the ratchet 471, while the distance between the guide section 476 and the center of the rack and pinion wheel 47 gradually decreases from the radial outer end to the inner end, and the guide section 476 extends radially outward away from the tangent of the arc-shaped section 475. When the knob 43 is locked, the ratchet 474 of the ratchet 471 abuts against one of the two adjacent limiting teeth 412, while the guide section 476 abuts against the other limiting tooth 412. The shape formed by the guide section 476 and the ratchet 474 basically matches the tooth groove of the limiting tooth 412, restricting the rotation of the rack and pinion wheel 47 and the drive knob 46.

[0085] The drive button 46 includes a rotating cylinder 461 and a turntable 462. The rotating cylinder 461 is a cylindrical shape rotatably connected to a fixed shaft 422, and a rack and pinion wheel 47 is sleeved on the outside of the rotating cylinder 461. The rotating cylinder 461 passes through the rack and pinion wheel 47 and is connected to the second transmission gear 45. Specifically, the second transmission gear 45 has two radially opposite insertion grooves 451 on its radially inner side, and the top surface of the rotating cylinder 461 has two nested teeth 463. After the two nested teeth 463 are inserted into the insertion grooves 451 respectively, the second transmission gear 45 and the rotating cylinder 461 are linked together.

[0086] The second transmission gear 45 abuts against the top surface of the rack and pinion wheel 47.

[0087] The turntable 462 is fitted around the rotating cylinder 461 and is connected to or integrally formed with the bottom end of the rotating cylinder 461. The turntable 462 is disc-shaped and located on the bottom surface of the rack and pinion wheel 47 and the ratchet 471. The rack and pinion wheel 47 and the ratchet 471 abut against the top surface of the turntable 462. The turntable 462 and the ratchet 471 are both located in the inner tooth groove 411 of the bottom cover 41, and the bottom end of the fixed shaft 422 is also located in the inner tooth groove 411.

[0088] The top surface of the turntable 462 is provided with two protruding teeth 464. The two protruding teeth 464 are respectively inserted into the drive grooves 472 of the two ratchet 471. When the turntable 462 rotates with the second transmission gear 45, the two protruding teeth 464 can slide along the radial inner sidewalls 473 of the two drive grooves 472.

[0089] In the locked state, the ratchet 474 and the guide surface section 476 abut against the tooth groove formed by two adjacent limiting teeth 412, restricting the rotation of the transmission mechanism.

[0090] In the rotating state, the knob 43 can sequentially drive the first transmission gear 44, the second transmission gear 45, the drive knob 46, and the rack and pinion wheel 47 to rotate. When the knob 43 rotates clockwise, the first transmission gear 44, the second transmission gear 45, and the drive knob 46 also rotate clockwise. The protruding teeth 464 on the turntable 462 slide clockwise along the drive groove 472, sliding from the outer circumferential end of the drive groove 472 toward the inner end. The guide surface section 476 gradually disengages from the limiting tooth 412, thereby driving the rack and pinion wheel 47 to rotate clockwise. The two adjusting belts 49 move closer to each other, and the head circumference decreases.

[0091] When knob 43 is rotated counterclockwise, the first transmission gear 44, the second transmission gear 45, and the drive knob 46 also rotate counterclockwise. The protruding tooth 464 of the turntable 462 moves from the inner end of the drive groove 472 along the radial inner wall 473 of the drive groove 472 toward the outer end in the circumferential direction, so that the outer end of the ratchet 471 gradually approaches the rack and pinion wheel 47. The ratchet tooth 474 gradually disengages from the limiting tooth 412. After rotating counterclockwise to a certain angle or a certain number of turns, knob 43 is released, and the protruding tooth 464 moves inward along the radial side wall of the drive groove 472. The ratchet tooth 474 of the ratchet 471 re-engages with the limiting tooth 412, fixing the transmission mechanism again.

[0092] The head circumference adjustment mechanism 4 can adjust the tightness of the EEG helmet 100 and has a locking function after tightening. It can adapt to wearers with different head circumferences, making it convenient to use and improving wearing stability and comfort.

[0093] The bracket 42 and the bottom cover 41 are connected to form a receiving area for accommodating the head circumference adjustment mechanism 4. The bottom surface of the top plate 421 is provided with a top recessed area, and the top surface of the bottom cover 41 is provided with a limiting recessed area. The limiting recessed area and the top recessed area are arranged opposite to each other and cooperate to accommodate two racks 48 and a part of the adjustment belt 49. Of course, a limiting recessed area for accommodating the racks 48 and a part of the adjustment belt 49 near the racks can also be provided on the top surface of the bottom cover 41.

[0094] The top surface of the top plate 421 of the bracket 42 is also provided with a receiving groove 424, which is used to install the circuit board 6. The fixed shaft 422 is provided with a wiring cavity 423 extending in the vertical direction, which passes through the fixed shaft 422 in the vertical direction and communicates with the receiving groove 424 of the bracket 42.

[0095] The bottom cover 41 has a wiring space 413 for installing cable 7. The cable 7 can be bent in the wiring space 413 of the bottom cover 41 and extend from the wiring cavity 423 of the fixed shaft 422 to the receiving groove 424 of the top plate 421, and is electrically connected to the circuit board 6.

[0096] Because the circuit board 6 is mounted above the head circumference adjustment mechanism 4, the cable 7 from the front bottom cover 41 needs to pass through the head circumference adjustment mechanism 4 and is not affected by the tightening or loosening of the EEG helmet 100. The cable 7 travels through a cable chain-like layout within the bottom cover 41, then passes through the cable routing cavity 423 of the fixed shaft 422 to reach the circuit board 6, adapting to the extension and retraction of the EEG helmet 100 and avoiding the risk of interference with the complex gear structure. Through the arrangement of the cable 7 and the circuit board 6, the entire structure is compact, lightweight, and convenient, without affecting the operation of other functions.

[0097] A signal amplifier connector 61 is mounted on the circuit board 6 for receiving signals, and the signal amplifier connector 61 is also located within the receiving slot 424. The cable 7 of the circuit board 6 extends between the bottom cover 41 and the top cover 1 to the front cover 2, and connects to multiple dry electrode heads 32 on the rear cover and the front cover 2. The overall cable 7 is relatively simple, and adjusting the head circumference and rotating the dry electrode heads 32 will not affect the cable 7. The structure is simple and easy to install.

[0098] In addition, Figure 1-4 In the illustrated embodiment, the housing of the dry electrode head assembly connected to the rear cover is part of the bottom cover, or the housing is a separate part fixedly connected to the bottom cover. The housing of the dry electrode head assembly connected to the front cover is part of the front cover. Of course, in other embodiments, the housing may also be a separate part fixedly connected to the front cover. This invention does not limit the connection method between the housing and the front or rear cover.

[0099] The preferred embodiments of the present invention have been described in detail above, but it should be understood that, if necessary, aspects of the embodiments can be modified to utilize aspects, features, and concepts from various patents, applications, and publications to provide other embodiments.

[0100] In light of the detailed description above, these and other changes can be made to the embodiments. Generally, the terminology used in the claims should not be considered limited to the specific embodiments disclosed in the specification and claims, but should be understood to include all possible embodiments together with the full scope of equivalents enjoyed by these claims.

[0101] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of the present invention.

Claims

1. A brainwave helmet, characterized in that, include: The bottom cover has a wiring space; The bracket and the bottom cover are connected to form a receiving area for accommodating the head circumference adjustment mechanism. The bracket is provided with a receiving groove and a wiring cavity. The receiving groove is used to install a circuit board, and the wiring cavity is in communication with the receiving groove and the wiring space.

2. The EEG helmet according to claim 1, characterized in that, The bracket includes a fixed shaft, and the wiring cavity is disposed within the fixed shaft; A portion of the head circumference adjustment mechanism is rotatably connected to the fixed shaft; The receiving slot is located at the top of the bracket.

3. The EEG helmet according to claim 2, characterized in that, The head circumference adjustment mechanism includes: Two racks are arranged opposite to each other, and the two racks are movably connected to the bottom cover; Two adjusting belts, each of which is connected to one of the two racks; A transmission mechanism, which is rotatably connected to the fixed shaft and meshes with the two racks; A knob, which is rotatably connected to the bracket and drively connected to the transmission mechanism, and can switch between a rotating state and a locked state; In the rotating state, the knob can drive the transmission mechanism to rotate clockwise or counterclockwise, thereby driving the two racks to move the opposite ends of the two adjusting belts closer to or further away from each other; In the locked state, the limiting part abuts against the transmission mechanism, restricting the rotation of the transmission mechanism.

4. The EEG helmet according to claim 3, characterized in that, The transmission mechanism includes: A first transmission gear meshes with the internal gear of the knob; The second transmission gear is rotatably connected to the fixed shaft and meshes with the first transmission gear. A transmission component, which is rotatably connected to the fixed shaft and connected to the second transmission gear, and meshes with the two racks; In the rotating state, the knob can drive the first transmission gear, the second transmission gear, and the transmission component to rotate clockwise or counterclockwise; In the locked state, the limiting part abuts against the transmission member, restricting the rotation of the transmission mechanism.

5. The EEG helmet according to claim 4, characterized in that, The bottom cover is provided with an inner toothed groove, and the limiting part is a plurality of limiting teeth provided on the inner wall of the inner toothed groove; The transmission component includes: A rack and pinion wheel, wherein the rack and pinion wheel is rotatably connected to the fixed shaft and meshes with two racks, and a ratchet is provided on the radially outer side of the rack and pinion wheel, wherein the ratchet is provided with a drive groove, and the drive groove extends circumferentially; A drive button, a portion of which is located within the internal tooth groove and rotatably connected to the fixed shaft, is connected to the second transmission gear, and has protruding teeth located within the drive groove; In the locked state, the ratchet abuts against the limiting tooth; In the rotating state, the knob can sequentially drive the first transmission gear, the second transmission gear, and the drive knob to rotate clockwise or counterclockwise. The protruding teeth slide along the drive groove and cause the ratchet to disengage from the limiting teeth, thereby driving the rack and pinion wheel to rotate. The rack and pinion wheel drives the two racks to rotate.

6. The EEG helmet according to claim 5, characterized in that, The second transmission gear is provided with an embedded groove; The drive button has nested teeth located within the embedded slot.

7. The EEG helmet according to claim 5, characterized in that, The drive button includes: A rotating drum, which is rotatably connected to the fixed shaft and has the nested teeth on its top surface; A turntable, which is fitted over the rotating cylinder and has protruding teeth on its top surface; The rack and pinion wheel is sleeved outside the rotating drum; The ratchet is located on the top surface of the turntable; The second transmission gear abuts against the top surface of the rack and pinion wheel.

8. The EEG helmet according to claim 5, characterized in that, The inner radial end of the ratchet is connected to the rack and pinion wheel, and the outer radial end protrudes outward in the radial direction and abuts against the limiting tooth.

9. The EEG helmet according to claim 5, characterized in that, The two ratchet wheels are connected to the rack and pinion wheel and are each provided with the drive groove; The top surface of the turntable is provided with two protruding teeth, which are located in the two drive slots respectively.

10. The EEG helmet according to claim 3, characterized in that, The EEG helmet also includes a dry electrode head assembly, which comprises: A housing, which is connected to the bottom cover and is provided with clearance holes; A dry electrode head, which passes through the clearance hole and is rotatably connected to the housing.

11. The EEG helmet according to claim 3, characterized in that, The EEG helmet also includes a dry electrode head assembly, the dry electrode assembly comprising: The housing is connected to or is part of the bottom cover, and the housing has a clearance hole on its inner side along a first direction; A dry electrode head, which passes through the clearance hole and is movable along the first direction; A biasing element is connected to the housing and operably drives the dry electrode head to move along the first direction away from the outside of the housing.

12. The EEG helmet according to claim 10 or 11, characterized in that, The EEG helmet includes a back cover and a front cover; At least one of the dry electrode head assemblies is connected to the rear cover, and at least one other dry electrode head assembly is connected to the front cover; The head circumference adjustment mechanism is connected to one of the back cover and the front cover, and the two adjustment straps are connected to the other of the back cover and the front cover.

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