CN217824924U

CN217824924U - Optical axis keyboard

Info

Publication number: CN217824924U
Application number: CN202220897499.0U
Authority: CN
Inventors: 吴福喜; 陶崇阳
Original assignee: Dongguan Kaihua Electronics Co Ltd
Current assignee: Dongguan Kaihua Electronics Co Ltd
Priority date: 2021-09-09
Filing date: 2022-04-18
Publication date: 2022-11-15
Anticipated expiration: 2032-04-18
Also published as: CN216873184U; CN217037159U; WO2023103496A1; TWM643656U; WO2023103836A1; TWM638201U

Abstract

The utility model discloses an optical axis keyboard, including the PCB board, locate the several key switch on the PCB board, and locate PCB board lower surface and with several key switch one-to-one set up array light guide subassembly, the light guide subassembly is including locating the infrared emission component and the photosensitive receiving element of PCB board lower surface relatively, be equipped with the fender optical axis that is used for sheltering from light between infrared emission component and the photosensitive receiving element on the key switch, be equipped with at PCB board lower surface with array light guide subassembly one-to-one and go into several lens hood wherein with the light guide subassembly cover, be formed with the mounting groove on the surface that the lens hood is close to the PCB board, the bottom upwards extends and is equipped with an at least pothook in the mounting groove, be formed with an at least screens that supplies the pothook card to go into on the PCB board. The utility model discloses can reach and prevent the crosstalk, prevent signal interference and dustproof and waterproof's purpose, do benefit to the degree of accuracy that improves key switch's switching on and breaking off on the keyboard.

Description

Optical axis keyboard

Technical Field

The utility model relates to a technical field of keyboard especially relates to an optical axis keyboard.

Background

The optical axis keyboard is a novel keyboard in recent years, a brand-new optical sensing identification technology is added on the basis of the traditional mechanical key shaft technology, and the traditional contact plectrum is replaced by an optical sensing component, so that the problems of the traditional contact type mechanical switch are solved. The optical axis technology adopts infrared optical induction, no contact point is generated and the contact is not abraded when the optical axis technology is conducted, meanwhile, the optical type mechanical signal is optical pulse, the output waveform is clean and zero noise, and the problem of contact jitter is completely eliminated.

However, in the conventional optical axis keyboard, the optical signal is easily affected by external light, and the problems of crosstalk and signal interference occur; meanwhile, the problems of dust and water prevention are solved, so that the accuracy of connection and disconnection is low, and even the phenomenon of mistaken connection can be caused.

SUMMERY OF THE UTILITY MODEL

To the above, an object of the utility model is to provide an optical axis keyboard reaches and prevents the bunch of light, prevents signal interference and dustproof and waterproof's purpose, does benefit to the degree of accuracy that improves key switch's switching on and disconnection on the keyboard.

The utility model discloses a reach the technical scheme that above-mentioned purpose adopted and be:

the utility model provides an optical axis keyboard, including a PCB board, set up the several key switch on the PCB board, and set up in PCB board lower surface and with several light guide subassembly of key switch one-to-one setting, this light guide subassembly is including setting up an infrared emission component and a photosensitive receiving element in PCB board lower surface relatively, be provided with on this key switch and be used for sheltering from a fender optical axis of light between infrared emission component and the photosensitive receiving element, a serial communication port, be provided with at this PCB board lower surface with several light guide subassembly one-to-one and cover the several lens hood wherein the light guide subassembly goes into, be formed with a mounting groove on the surface that this lens hood is close to the PCB board, upwards extend in this mounting groove bottom and be provided with at least a pothook, be formed with at least a screens that supplies the pothook card to go into on this PCB board.

As a further improvement of the utility model, the screens are the card hole that is formed on the PCB board.

As a further improvement of the present invention, two light-shielding walls are oppositely disposed in the mounting groove, a receiving groove is formed inside each of the light-shielding walls, the infrared emitting element is accommodated in one of the receiving grooves, and the photosensitive receiving element is accommodated in the other receiving groove; an opening is formed on one side of each of the two shading enclosing walls, the two accommodating grooves are communicated through the openings to form an optical channel, and the optical channel is positioned below the light blocking axis.

As a further improvement, the quantity of pothook and screens is four respectively, wherein two pothook lower parts and shading enclosure body coupling, two pothooks set up with shading enclosure separation in addition.

As a further improvement of the utility model, four grabs are distributed in the mounting groove and are close to four corner positions.

As a further improvement of the utility model, a through-hole that supplies several key switch installation and supplies to keep off the optical axis and pass is seted up on the PCB board, and this through-hole is located the light passageway top.

As a further improvement, the bottom of the key switch extends downwards to form a central positioning column inserted into the through hole.

As a further improvement, a center yielding groove which is positioned between the two accommodating grooves and is positioned under the light blocking shaft is formed in the mounting groove.

The beneficial effects of the utility model are that:

(1) The lower surface of the PCB is additionally provided with the plurality of light shields which are in one-to-one correspondence with the plurality of groups of light conducting assemblies and are used for shielding external light of the key switch, so that the external light is prevented from generating signal interference on the light conducting assemblies, and the problems of light crosstalk and signal interference are avoided; meanwhile, the light shield plays a dustproof and waterproof role in the light conduction assembly, so that the accuracy of conduction and disconnection of the light conduction assembly is improved, and the phenomenon of mistaken conduction cannot occur.

(2) The clamping hook extending upwards from the bottom in the mounting groove of the light shield is directly clamped into the clamping position, so that the light shield can be conveniently, quickly and stably mounted and fixed on the lower surface of the PCB; simultaneously, the pothook also can be relaxed and follow the screens and separate, from this, adopts the mounting means that pothook and screens combined together, and installation and dismantlement are all convenient and fast, and simultaneously, the change of the lens hood of being convenient for, if certain lens hood appears damaging when needing to be changed, can block out the lens hood that damages, replaces, has reduced the cost of changing.

The above is an overview of the technical solution of the present invention, and the present invention is further explained with reference to the accompanying drawings and the detailed description.

Drawings

Fig. 1 is a partial exploded view of a medium optical axis keyboard according to the present invention;

FIG. 2 is a partial sectional view of the optical axis keyboard according to the present invention;

FIG. 3 is a partial sectional view of the keyboard with a central optical axis of the present invention in another direction;

FIG. 4 is a schematic view of the position structure of the mid-infrared emitting device, the photosensitive receiving device and the light shield according to the present invention;

fig. 5 is a schematic structural view of the key switch of the present invention;

fig. 6 is a schematic view of a part of the structure of the medium optical axis keyboard of the present invention.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the intended purpose, the following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings and preferred embodiments.

Please refer to fig. 1 to fig. 3 and fig. 6, an embodiment of the present invention provides an optical axis keyboard, which includes a PCB 1, a plurality of key switches 2 disposed on the PCB 1, and a plurality of light guide assemblies 3 disposed on a lower surface of the PCB 1 and corresponding to the plurality of key switches 2 one to one, specifically, the light guide assemblies 3 include an infrared emitting element 31 and a photosensitive receiving element 32 disposed on the lower surface of the PCB 1, a light blocking axis 20 disposed on the key switch 2 for blocking light between the infrared emitting element 31 and the photosensitive receiving element 32, a plurality of light shields 4 disposed on the lower surface of the PCB 1 and corresponding to the plurality of light guide assemblies 3 one to one and covering the light guide assemblies 3 therein, the light shields 4 are used for shielding light outside the key switches 2, preventing external light from generating signal interference to the light guide assemblies 3, and simultaneously playing a dustproof and waterproof role to the light guide assemblies 3.

As to the installation manner of the light shielding cover 4, in this embodiment, an installation groove 41 is formed on the surface of the light shielding cover 4 close to the PCB board 1, at least one hook 42 extends upward from the bottom of the installation groove 41, and at least one locking position 11 for the hook 42 to be locked into is formed on the PCB board 1, specifically, the locking position 11 is a locking hole formed on the PCB board 1, as shown in fig. 1. The hooks 42 can be easily clamped in the clamping positions 11 by aligning the hooks 42 with the clamping positions 11, so that the light shield 4 can be conveniently, quickly and stably installed and fixed on the lower surface of the PCB 1; meanwhile, the hook 42 can be easily detached from the position-limiting block 11, so that the installation and the detachment are both convenient and fast by adopting an installation mode of combining the hook 42 and the position-limiting block 11. The mode that the pothook 42 is blocked is adopted, so that the light shield 4 can be conveniently replaced, and if a certain light shield is damaged and needs to be replaced, the damaged light shield can be blocked out for replacement, so that the replacement cost is reduced.

In the present embodiment, the light blocking shaft 20 is disposed at the lower end of the guide core 22 of the key switch 2, as shown in fig. 3, so that when the guide core 22 is pressed to move up and down, the light blocking shaft 20 moves up and down. At the same time, the upward movement return of the guide core 22 is provided with an elastic restoring force by a spring in the push switch 2. When the guide core 22 is pressed downwards, the light blocking shaft 20 is driven to move downwards synchronously, the light blocking shaft 20 moves downwards to a position between the infrared emitting element 31 and the photosensitive receiving element 32, light rays emitted by the infrared emitting element 31 are blocked, the photosensitive receiving element 32 cannot receive the light rays, namely the light blocking shaft 20 blocks a light path between the infrared emitting element 31 and the photosensitive receiving element 32, a signal is given to the PCB 1 at the moment, and the signal is defined as a key switch conducting signal. When the pressing on the guide core 22 is released, the guide core 22 and the light blocking shaft 20 move upwards and return under the driving of the spring, the light blocking shaft 20 leaves between the infrared emitting element 31 and the photosensitive receiving element 32, the light path between the infrared emitting element 31 and the photosensitive receiving element 32 is not blocked any more, the photosensitive receiving element 32 can normally receive the light emitted by the infrared emitting element 31, a signal is given to the PCB board 1 at the moment, and the signal is defined as a key switch off signal.

Therefore, the light blocking shaft 20 is combined with the light conduction component 3 structure to realize the connection or the blockage of the light path between the infrared ray transmitting element 31 and the photosensitive receiving element 32, thereby realizing the connection and disconnection functions of the key switch 2.

In order to prevent the cross-talk and signal interference, as shown in fig. 4, two light-shielding walls 43 are oppositely disposed in the mounting groove 41, a receiving groove 44 is formed inside each light-shielding wall 43, the infrared emitting element 31 is received in one of the receiving grooves 44, and the photosensitive receiving element 32 is received in the other receiving groove 44; an opening 431 is formed on one side of each of the two light-shielding walls 43, and the two accommodating grooves 44 are communicated through the opening 431 to form an optical channel, and the optical channel is located below the light-blocking axis 20. The infrared emitting device 31 and the photosensitive receiving device 32 are respectively surrounded by two light shielding walls 43, so that the light emitted from the infrared emitting device 31 can only be emitted from the light channel to the photosensitive receiving device 32 for receiving, and the light blocking shaft 20 only needs to be moved down into the light channel to block the light. Meanwhile, the peripheral wall of the light shield 4 (i.e. the periphery of the mounting groove 41) is combined to prevent external light from entering, i.e. the light emitted by the infrared emitting element 31 and the external light are shielded, so as to prevent the problems of light crosstalk and signal interference, thereby being beneficial to improving the accuracy of conduction and disconnection of the light conduction assembly 3 and avoiding the phenomenon of misconduction. Meanwhile, the special structure inside the light shield 4 plays a role in further preventing dust and water for the light conduction assembly 3.

In the present embodiment, as shown in fig. 4, the number of the hooks 42 and the latches 11 is four, wherein the lower portions of two hooks 42 are integrally connected to the light-shielding wall 43, and the other two hooks 42 are separately disposed from the light-shielding wall 43. Meanwhile, the four hooks 42 are distributed in the mounting groove 41 near four corners. Four hooks 42 designed by special structure and special position distribution on the light shield 4 firmly mount the light shield 4 on the lower surface of the PCB 1.

In order to facilitate the downward extending movement of the light blocking shaft 20, as shown in fig. 1 to fig. 3, in the present embodiment, a through hole 12 for installing the plurality of key switches 2 and for passing the light blocking shaft 20 is formed on the PCB 1, and the through hole 12 is located above the light channel. Meanwhile, a central positioning column 21 inserted into the through hole 12 is extended downward from the bottom of the key switch 2, as shown in fig. 5. When the guide core 22 is pressed downward, the light blocking shaft 20 can pass through the central positioning column 21 and extend into the light shield 4, so as to block light.

As shown in fig. 3 and 4, a central recess groove 45 is formed in the mounting groove 41 and located between the two receiving grooves 44 and directly below the light-blocking shaft 20, so that the light-blocking shaft 20 can move downward to block light.

It should be noted that the optical axis keyboard disclosed in the present invention is improved on a specific structure, and is not the innovative point of the present invention for a specific control mode. To the infrared emission component, photosensitive receiving element, PCB board and other parts that the utility model relates to, can be general standard component or the part that technical staff in the field knows, its structure, principle and control mode are known or know through conventional experimental method through the technical manual for technical staff in the field.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that other structures obtained by adopting the same or similar technical features as the above embodiments of the present invention are all within the protection scope of the present invention.

Claims

1. The utility model provides an optical axis keyboard, including a PCB board, set up the several key switch on the PCB board, and set up in PCB board lower surface and with several key switch one-to-one array light guide subassembly that sets up, this light guide subassembly is including setting up an infrared emission component and a photosensitive receiving element in PCB board lower surface relatively, be provided with on this key switch and be used for sheltering from a fender optical axis of light between infrared emission component and the photosensitive receiving element, a serial communication port, be provided with at this PCB board lower surface with several light guide subassembly one-to-one and cover the several lens hood wherein light guide subassembly goes into, be formed with a mounting groove on this lens hood is close to the surface of PCB board, the bottom upwards extends in this mounting groove and is provided with at least a pothook, be formed with at least a screens that supplies the pothook card to go into on this PCB board.

2. The optical axis keyboard of claim 1, wherein the detents are detent holes formed on a PCB board.

3. The optical axis keyboard of claim 1, wherein two light-shielding walls are oppositely disposed in the mounting slot, a receiving slot is formed inside each light-shielding wall, the infrared emitting element is received in one of the receiving slots, and the photosensitive receiving element is received in the other receiving slot; an opening is formed on one side of each of the two shading enclosing walls, the two accommodating grooves are communicated through the openings to form an optical channel, and the optical channel is positioned below the light blocking axis.

4. The optical axis keyboard of claim 3, wherein the number of the hooks and the detents is four, two hooks are integrally connected to the light-shielding wall, and two hooks are separately provided from the light-shielding wall.

5. The optical axis keyboard of claim 4, wherein the four hooks are disposed in the mounting groove near four corners.

6. The optical axis keyboard of claim 3, wherein the PCB board has a through hole for a plurality of key switches to be mounted thereon and for the optical axis to pass through, the through hole being located above the optical channel.

7. The optical axis keyboard of claim 6, wherein a central locating post is provided at the bottom of the keyswitch extending downward and inserted into the through hole.

8. The optical axis keyboard of claim 3, wherein a center relief groove is formed in the mounting groove between the two receiving grooves and directly below the optical axis.