阅读说明：本技术 超薄平衡按压光电按键结构 (Ultrathin balance pressing photoelectric key structure ) 是由 陈爱华 于 2021-09-13 设计创作，主要内容包括：本发明公开了一种超薄平衡按压光电按键结构,光栅结构为一耦合有联动翼的光栅翼,联动翼与光栅翼耦合为同步上下动作；联动翼与光栅翼之间设有具有两翘臂的复位扭簧,复位扭簧的一翘臂为联动翼提供向上弹力,另一翘臂为光栅翼提供向上弹力,所述键帽扣合在联动翼和光栅翼的上部；按压键帽任意位置均能驱动光栅翼下行进而使光敏元件接受的光量发生变化以产生按键信号。本方案采用相互耦合的光栅翼与联动翼,在确保按压平衡稳定的前提下进一步减小了上下移动行程,使按键结构能够做到更加轻薄；同时光栅翼具有触发光电信号的功能,联动翼具有按压发声的功能,光栅翼与联动翼之间行程限位,整体稳定,按压回复迅速,适合工业量产。(The invention discloses an ultrathin balanced pressing photoelectric key structure, wherein the grating structure is a grating wing coupled with a linkage wing, and the linkage wing and the grating wing are coupled to synchronously move up and down; a reset torsion spring with two warping arms is arranged between the linkage wing and the grating wing, one warping arm of the reset torsion spring provides upward elasticity for the linkage wing, the other warping arm provides upward elasticity for the grating wing, and the keycap is buckled on the upper parts of the linkage wing and the grating wing; any position of the keycap is pressed to drive the grating wing to move downwards so as to change the light quantity received by the photosensitive element to generate a key signal. The scheme adopts the grating wings and the linkage wings which are coupled with each other, so that the up-and-down movement stroke is further reduced on the premise of ensuring the balance and stability of pressing, and the key structure can be lighter and thinner; meanwhile, the grating wing has the function of triggering photoelectric signals, the linkage wing has the function of pressing and sounding, the stroke between the grating wing and the linkage wing is limited, the whole structure is stable, the pressing and returning are rapid, and the grating wing and the linkage wing are suitable for industrial mass production.)

1. An ultrathin balance pressing photoelectric key structure comprises a keycap, a light-emitting element and a photosensitive element which are arranged on a PCB (printed circuit board), and a grating structure used for enabling the photosensitive element to receive the light quantity of the light-emitting element to generate variable, and is characterized in that the grating structure is a grating wing coupled with a linkage wing, and the linkage wing and the grating wing are coupled to move up and down synchronously; a reset torsion spring with two warping arms is arranged between the linkage wing and the grating wing, one warping arm of the reset torsion spring provides upward reset elasticity for the linkage wing, the other warping arm provides upward reset elasticity for the grating wing, and the keycap is buckled on the upper parts of the linkage wing and the grating wing; any position of the keycap is pressed to drive the grating wing to move downwards so as to change the light quantity received by the photosensitive element to generate a key signal.

2. The ultra-thin balanced pressing photoelectric key structure according to claim 1, wherein the grating wing and the linkage wing are coupled by a coupling seat, and coupling arms extend from both sides of the linkage wing and the grating wing; anti-drop fulcrums are protruded on one sides of the coupling arms; the connecting seat is provided with a support corresponding to the anti-falling fulcrum, the support is provided with an accommodating notch, and the anti-falling fulcrum can be movably embedded in the corresponding accommodating notch and is limited up and down.

3. The ultra-thin balanced pressing photoelectric key structure as claimed in claim 2, further comprising a limiting cover plate capable of being fixed on the connecting seat, wherein the limiting cover plate is provided with a drop-proof groove at a position corresponding to the receiving notch of the bracket, and the drop-proof groove can prevent the fulcrum embedded in the receiving notch from dropping off the receiving notch.

4. The ultra-thin balanced-pressing optoelectronic keypad structure as claimed in claim 3, wherein the two coupling arms are coupled to each other, wherein the end of one of the coupling arms is configured as a coupling opening with a shape of Chinese character 'ao', and the end of the other coupling arm is configured as a coupling block capable of extending into the coupling opening.

5. The ultra-thin balanced pressing photoelectric key structure according to claim 3, wherein hook portions are formed between the anti-falling grooves, a clamping groove is formed in the position, corresponding to the hook portions, of the support, the limiting cover plate and the support are fastened and fixed with the clamping groove through the hook portions, and a torsion spring groove for accommodating a reset torsion spring is further formed in the limiting cover plate.

6. The ultra-thin balanced pressing photoelectric key structure according to claim 3, wherein the linkage wing is provided with a sounding power storage portion corresponding to a sounding torsion spring, the position of the limiting cover plate on the sounding torsion spring is provided with a fixed cavity, and the sounding torsion spring is fixed in the fixed cavity; the sounding power storage part is provided with an arc chamfer, and the force arm of the sounding torsion spring extends to the position of the arc chamfer; when the keycap is pressed to a certain stroke, the force arm slides away from the arc chamfer to hit the limit cover plate to generate a knocking sound; when the keycap is loosened, the arc chamfer angle moves upwards and returns to the moment arm.

7. The ultra-thin balanced pressing photoelectric key structure of claim 3, wherein the grating wing and the coupling arm thereof extend in the same direction to form a grating portion, a light shielding plate extends downward from the end of the grating portion, and the light emitting element and the photosensitive element are located on two sides of the light shielding plate.

8. The ultra-thin balanced pressing photoelectric key structure of claim 7, wherein the connection seat is further provided with a light limiting plate, the light limiting plate is provided with a light through hole, the light emitting element and the photosensitive element are positioned at two sides of the light limiting plate, and the light shielding plate is positioned at one side of the light limiting plate; when the shading plate descends, the shading hole can be gradually shaded in a shearing mode so that the photosensitive element receives linearly gradually-changed luminous flux.

9. The ultra-thin balanced pressing photoelectric key structure as claimed in any one of claims 1 to 8, wherein the key cap is provided with a connecting portion for connecting the top ends of the grating wings and the linkage wings, and a limit stop for preventing the key cap from horizontally swinging at the top ends of the grating wings and the linkage wings.

10. The ultra-thin balanced pressing photoelectric key structure as claimed in any one of claims 1 to 8, wherein an assembly clamping seat for fixedly mounting the coupling seat is arranged on the PCB, the assembly clamping seat is a hollow frame structure, two raised clamping and pressing strips are arranged on two sides in the frame, and a shrinking through groove is hollowed out on a frame adjacent to the clamping and pressing strip on at least one side.

Technical Field

The invention relates to a switch device, in particular to a photoelectric switch, and particularly relates to an ultrathin balanced pressing photoelectric key structure which is mainly used for peripheral devices for signal input such as keyboards and the like.

Background

An input device is a device that inputs data and information to a computer, and is the bridge that the computer communicates with a user or other devices, such as a keyboard. The keyboard is formed by combining a plurality of key switches.

The existing electronic equipment is more and more miniaturized, and the light and thin requirements on the keyboard are higher and higher. Taking a notebook computer as an example, the weight of the existing notebook computer is only about 1kg, the thickness of the whole computer is only about 13mm, and the key stroke of the switch key is only about 1.5mm, in order to meet the light and thin design of electronic equipment, one of the biggest obstacles influencing the thickness is the thickness of the keyboard, and the core problem influencing the thickness of the keyboard is the height (thickness) of the key switch, how to make the key switch ultrathin and not influence the balance stability when pressing, so as to ensure that a user can accurately and stably generate a switch signal when pressing different positions of a keycap, which is a technical problem in the field. In the prior art, in order to realize balanced and stable pressing of an ultrathin key switch, scissors feet with small key strokes are basically adopted, but the mechanism principle of the scissors feet limits that the scissors feet cannot be further thinned.

In addition, in the prior art, in order to achieve technical effects such as longer service life of the key switch, dust prevention, water prevention and the like, a great number of photoelectric switches are adopted to replace traditional switches such as metal contact pieces and contacts. The photoelectric switch is a switch that changes the amount of light received by a light receiving element from a light emitting element through a grating to form a switching signal.

The invention aims to further make the photoelectric switch light and thin, further reduce the pressing stroke relative to the scissor feet, and meet the technical requirement of stable balance, thereby constructing a brand-new structure suitable for the photoelectric switch.

Disclosure of Invention

In view of the above problems, the present invention is directed to an ultra-thin balanced-pressing photoelectric key structure capable of effectively reducing a pressing distance.

In order to realize the technical purpose, the scheme of the invention is as follows: an ultrathin balance pressing photoelectric key structure comprises a keycap, a light-emitting element and a photosensitive element which are arranged on a PCB (printed circuit board), and a grating structure used for enabling the photosensitive element to receive the light quantity of the light-emitting element to generate variable, and is characterized in that the grating structure is a grating wing coupled with a linkage wing, and the linkage wing and the grating wing are coupled to move up and down synchronously; a reset torsion spring with two warping arms is arranged between the linkage wing and the grating wing, one warping arm of the reset torsion spring provides upward reset elasticity for the linkage wing, the other warping arm provides upward reset elasticity for the grating wing, and the keycap is buckled on the upper parts of the linkage wing and the grating wing; any position of the keycap is pressed to drive the grating wing to move downwards so as to change the light quantity received by the photosensitive element to generate a key signal.

Preferably, the grating wing and the linkage wing are coupled through a coupling seat, and coupling arms extend from two sides of the linkage wing and two sides of the grating wing; anti-drop fulcrums are protruded on one sides of the coupling arms; the connecting seat is provided with a support corresponding to the anti-falling fulcrum, the support is provided with an accommodating notch, and the anti-falling fulcrum can be movably embedded in the corresponding accommodating notch and is limited up and down.

Preferably, the connecting device further comprises a limiting cover plate capable of being fixed on the connecting seat, wherein an anti-dropping groove is formed in the position, corresponding to the accommodating notch of the support, of the limiting cover plate, and the anti-dropping groove can prevent a fulcrum embedded in the accommodating notch from dropping from the accommodating notch.

Preferably, the coupling arms are coupled to each other, and a distal end of one of the coupling arms is formed as a coupling opening shaped like a Chinese character 'ao', and a distal end of the other coupling arm is formed as a coupling piece which can be inserted into the coupling opening.

Preferably, a clamping hook part is formed between the anti-falling grooves, a clamping groove is formed in the position, corresponding to the clamping hook part, of the support, the limiting cover plate and the support are fixedly fastened with the clamping groove through the clamping hook part, and a torsion spring groove used for containing a reset torsion spring is further formed in the limiting cover plate.

Preferably, the linkage wing is provided with a sounding power storage part, the sounding power storage part is correspondingly provided with a sounding torsion spring, the position of the limiting cover plate, which is located on the sounding torsion spring, is provided with a fixed containing cavity, and the sounding torsion spring is fixed in the fixed containing cavity; the sounding power storage part is provided with an arc chamfer, and the force arm of the sounding torsion spring extends to the position of the arc chamfer; when the keycap is pressed to a certain stroke, the force arm slides away from the arc chamfer to hit the limit cover plate to generate a knocking sound; when the keycap is loosened, the arc chamfer angle moves upwards and returns to the moment arm.

Preferably, the grating wing and the coupling arm thereof extend in the same direction to form a grating portion, the end of the grating portion extends downward to form a light shielding plate, and the light emitting element and the photosensitive element are located on two sides of the light shielding plate.

Preferably, the connecting seat is further provided with a light limiting plate, the light limiting plate is provided with a light through hole, the light emitting element and the photosensitive element are positioned on two sides of the light limiting plate, and the light shielding plate is positioned on one side of the light limiting plate; when the shading plate descends, the shading hole can be gradually shaded in a shearing mode so that the photosensitive element receives linearly gradually-changed luminous flux.

Preferably, the key cap is provided with a connecting part for connecting the grating wing and the top end of the linkage wing, and is further provided with a limit stop for preventing the key cap from horizontally shaking at the top ends of the grating wing and the linkage wing.

Preferably, the PCB is provided with an assembly clamping seat for fixedly mounting the connecting seat, the assembly clamping seat is of a hollow frame structure, two sides in the frame are provided with raised clamping and pressing strips, and a frame adjacent to the clamping and pressing strip on at least one side is hollowed out to form a contraction through groove.

The invention has the beneficial effects that: the mutually coupled grating wings and the linkage wings are adopted, so that the up-and-down movement stroke is further reduced on the premise of ensuring the balance and stability of pressing, and the key structure can be lighter and thinner; meanwhile, the grating wing has the function of triggering photoelectric signals, the linkage wing has the function of pressing sounds, the stroke between the grating wing and the linkage wing is limited, the whole structure is stable, the pressing response is rapid, the flat pressing hand feeling can be provided, the installation and the disassembly are very convenient, and the device is suitable for industrial mass production.

Drawings

FIG. 1 is a schematic view of a key assembly structure according to the present invention;

FIG. 2 is an exploded view of the key of the present invention;

FIG. 3 is a schematic structural view of a coupling seat in the present invention;

FIG. 4 is a schematic structural view of a spacing cover plate according to the present invention;

FIG. 5 is a schematic structural view of an assembled cartridge according to the present invention;

FIG. 6 is a schematic structural view of a torsion spring connecting the grating wing and the linkage wing according to the present invention;

FIG. 7 is a schematic structural view of the grating wing and the linkage wing in a released state according to the present invention;

FIG. 8 is a schematic view of the structure of the grating wing and the linkage wing in the pressed state;

FIG. 9 is a schematic structural view of the present invention with the keycap and the limiting cover plate omitted;

FIG. 10 is a schematic side view of a grating wing and a linkage wing according to the present invention;

FIG. 11 is a partial enlarged view of a in FIG. 10;

FIG. 12 is a second enlarged partial view of A in FIG. 10;

FIG. 13 is a schematic structural diagram of the bottom of a keycap according to the invention.

In the figure: 1. a keycap; 11. a connecting portion; 12. a limit stop block; 2. a coupling seat; 21. a bracket, 22, an accommodating notch; 23. a card slot; 24. a light limiting plate; 25. a light through hole; 3. a limiting cover plate; 31. a drop-proof groove; 32. a hook part; 33. a torsion spring groove; 34. a fixed cavity; 4. a grating wing; 41. an anti-drop fulcrum; 42. a coupling port; 43. a coupling arm; 44. a grating section; 45, a first step of; a visor; 5. a linkage wing; 51. a coupling block; 52. a sounding torsion spring; 53. a sound production power storage part; 6. assembling the card seat; 61. clamping and pressing the strip; 62. the through groove is contracted; 7. a PCB board; 71. a light emitting element; 72. a photosensitive element; 73. an LED lamp; 8. a return torsion spring.

Detailed Description

The invention is described in further detail below with reference to the figures and specific embodiments.

As shown in fig. 1-13, the embodiment of the present invention is an ultra-thin balanced-pressing electro-optical key structure for being arranged as a key to output a switching signal, and a plurality of keys can be combined to form a keyboard or other related input devices.

The key of the invention completes the action of the whole key by pressing the key cap 1, each key comprises the key cap 1, a light-emitting element 71 and a photosensitive element 72 which are arranged on a PCB, and a grating structure which is used for enabling the photosensitive element 72 to receive the light quantity of the light-emitting element 71 to generate variable, and the key cap 1 can be electrically connected and the change of the light path can be realized by pressing, thereby executing the switch operation.

As shown in fig. 7-8, the grating structure is a grating wing 4 coupled with a linkage wing 5, the linkage wing 5 and the grating wing 4 are coupled to move up and down synchronously, and the keycap 1 is fastened on the linkage wing 5 and the upper part of the grating wing 4. In a static state, a static angle between the coupling arms of the linkage wing 5 and the grating wing 4 is an obtuse angle; when the keycap 1 is pressed to the bottom, the opening angle between the linkage wing 5 and the grating wing 4 is gradually increased, and the maximum angle between the coupling arms can be 180 degrees; when the grating wing is released, a reset torsion spring 8 with two warped arms is arranged between the linkage wing 5 and the grating wing 4, one warped arm of the reset torsion spring 8 provides upward elastic force for the linkage wing 5, the other warped arm provides upward elastic force for the grating wing 4, and the reset torsion spring 8 provides upward elastic force for resetting the linkage wing 5 and the grating wing 4.

As shown in fig. 9, the grating wing 4 and the linkage wing 5 are coupled through a coupling seat 2, and coupling arms 43, which are four in total in the embodiment of the present invention, extend from both sides of the linkage wing 5 and the grating wing 4; an anti-drop fulcrum 41 protrudes from one side of each coupling arm 43; the connecting seat 2 is provided with a bracket 21 corresponding to the anti-drop fulcrum 41, the bracket 21 is provided with an accommodating notch 22, and the anti-drop fulcrum 41 can be movably embedded in the corresponding accommodating notch 22 and is limited up and down.

The receiving slot 22 limits the upper and lower parts of the coupling arm 43, and since the coupling between the grating wing and the linkage wing is not a locked relationship (as shown in fig. 7), but a connection relationship that can be arbitrarily inserted and pulled, in order to prevent the coupling arms from being separated from each other, it is necessary to limit the coupling arms in the horizontal position direction, therefore, in the specific embodiment of the present invention, a limiting cover plate 3 capable of being fixed on the coupling seat 2 is further provided, the limiting cover plate 3 is provided with a separation-preventing slot 31 at a position corresponding to the receiving slot 22 of the bracket 21, the separation-preventing slot 31 can prevent a fulcrum embedded in the receiving slot 22 from being separated from the receiving slot 22, and the separation between the two coupling arms that are coupled from each other is also prevented.

The utility model provides a fixed through following mode between spacing apron 3 and the hookup seat 2, be formed with trip portion 32 between spacing apron 3's anticreep groove 31, be equipped with the draw-in groove 23 that corresponds with trip portion 32 on the support 21 of hookup seat 2, link together through trip portion 32 and draw-in groove 23 between spacing apron 3 and the support 21, in addition, still be equipped with the torsional spring groove 33 that is used for holding torsional spring 8 that resets on the spacing apron 3.

Two coupling arms 43 of intercoupling in this application button structure, specifically, the end of one of them coupling arm 43 is constructed and is established as the coupling mouth 42 of character cut in bas-relief shape, and the end of another coupling arm 43 is then established and is established and to be can stretch into coupling block 51 in the coupling mouth 42 presses key cap 1 optional position, and one of them end coupling arm 43 shifts down, makes coupling block 51/coupling mouth 42 rise and other end coupling arm 43 along with the downward displacement, when releasing key cap 1, two coupling arms 43 reset upwards along with the torsional spring together, realize two coupling arms 43 with the same time.

As shown in fig. 10-12, as the grating wing 4 for triggering the photoelectric signal, a grating portion 44 extends from the grating wing 4 and the coupling arm in the same direction, a light shielding plate 45 extends from the end of the grating portion 44, and the light emitting element and the light sensitive element are located at two sides of the light shielding plate. The connecting seat 2 is also provided with a light limiting plate 24, the light limiting plate 24 is provided with a light through hole 25, the light emitting element and the photosensitive element are positioned at two sides of the light limiting plate 24, and the light shielding plate 45 is positioned at one side of the light limiting plate 24; the light shield 45 can gradually shield the light-passing hole 25 in a shearing manner when descending so that the photosensitive element receives a linearly graded light flux.

The linkage wing 5 is used for triggering sound, a sound-producing power storage part 53 is arranged on the linkage wing 5, the sound-producing power storage part 53 corresponds to a sound-producing torsion spring 52, a fixed containing cavity 54 is arranged at the position, located on the sound-producing torsion spring 52, of the limiting cover plate 3, and the sound-producing torsion spring 52 is fixed in the fixed containing cavity 54; the sounding power storage part 53 is provided with an arc chamfer, and a power arm of the sounding torsion spring 52 extends to the position of the arc chamfer; when the keycap 1 is pressed, the arc chamfer exerts pressure on the force arm to enable the force arm to store force downwards, and when the keycap 1 is pressed to a certain stroke, the force arm slides away from the arc chamfer to hit the limit cover plate 3 to generate knocking sound; the limiting cover plate is also provided with a corresponding convex impacted part, the middle section of the sounding torsion spring can be impacted on the impacted part, the end part of the sounding torsion spring is prevented from being impacted to damage the limiting cover plate, and the arc chamfer is moved upwards to be reset onto the force arm when the keycap is released.

The linkage wing 5 is provided with a sounding power storage part 53, the lower part of the linkage wing 5 is connected with a sounding torsion spring 52, any position of the keycap 1 is pressed to drive the linkage wing 5 to move downwards so that the sounding torsion spring 52 stores power downwards, and when the keycap 1 is loosened, the sounding torsion spring 52 returns to beat the linkage wing 5 to make a sound.

As shown in figure 5, the PCB 7 is provided with an assembly clamping seat 6 for fixedly installing the connecting seat, the assembly clamping seat 6 is of a hollow frame structure, two sides in the frame are provided with raised clamping and pressing strips 61, the edge of the connecting seat 2 is pressed by the clamping and pressing strips 61 and then fixed during installation, in order to take out the connecting seat 2 during replacement, a contraction through groove 62 is hollowed out on a frame adjacent to the clamping and pressing strip 61 on at least one side, when the connecting seat 2 needs to be taken out, a tool such as a pressing clamp is adopted to clamp and press the frame with the contraction through groove 62, the frame can be contracted, and the clamping and pressing strips 61 are further away from the connecting seat 2, so that the key is greatly convenient to detach and replace, and the efficiency is improved. If the shrinkage through groove 62 is not arranged, the whole frame is rigid and has no compressed space, and the technical effect cannot be achieved.

As shown in fig. 13, the key cap 1 is provided with a connecting portion 11 for connecting the top ends of the grating wings 4 and the linkage wings 5, and a limit stopper 12 for preventing the key cap from horizontally shaking, and the limit stopper 12 can prevent the key cap from shaking left and right due to a clearance between the upper surface and the lower surface of the key cap caused by the decrease in the distance between the two end portions after the grating wings 4 and the linkage wings 5 are moved upward and returned.

In order to make the key have a colorful light effect, an LED lamp 73 is also arranged on the PCB, and light emitted by the LED penetrates through the keycap to make the key have a light effect aesthetic feeling.

The scissor-foot key structure is different from a common scissor-foot key structure, and the grating wings and the linkage wings which are mutually coupled are adopted, so that the up-and-down movement stroke is further reduced on the premise of ensuring the stable pressing balance, and the key structure can be lighter and thinner; meanwhile, the grating wing has the function of triggering photoelectric signals, the linkage wing has the function of pressing sounds, the stroke between the grating wing and the linkage wing is limited, the whole structure is stable, the pressing response is rapid, the flat pressing hand feeling can be provided, the installation and the disassembly are very convenient, and the device is suitable for industrial mass production.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any minor modifications, equivalent replacements and improvements made to the above embodiment according to the technical spirit of the present invention should be included in the protection scope of the technical solution of the present invention.