CN210222395U - Glasses - Google Patents

Abstract

The utility model provides a pair of glasses, including the picture frame, set up the lens group on the picture frame, set up in the mirror leg and the lens adjusting device of picture frame both sides, be equipped with the power for the power supply of lens adjusting device in the mirror leg, first optics piece and the second optics piece that the stack set up around the lens group is drawn together, and lens adjusting device all sets up on the picture frame and is used for driving lens group respectively, drives through lens adjusting device first optics piece and second optics piece relative movement in vertical direction. The utility model provides a pair of glasses's beneficial effect lies in that can produce the lens refraction effect of a plurality of different combinations through the relative movement of first optical sheet and the second optical sheet on every group lens in vertical side to utilize the lens diopter of this kind of combination to zoom the training to eyes, also can play the health care effect for the crowd that does not have myopia, play the effect that promotes training person's bore hole eyesight or the ametropia appears in prevention eyes.

Description

Glasses

Technical Field

The utility model belongs to the technical field of glasses and accessory thereof and specifically relates to a pair of glasses is related to.

Background

With the continuous popularization of the existing electronic products, people use electronic products such as computers, tablet computers, televisions and the like for a long time, and the visual fatigue and even the myopia are caused by overuse of eyes. In order to solve the demand of people for long-term eye use and eye protection, modern medicine is searching for methods capable of preventing and adjusting myopia of eyes to the utmost extent. People can train eyes through wearing protective glasses and changing different diopters on the protective glasses, so that the function of exercising eyes and preventing myopia is achieved. In the prior art, at most three lenses with different diopter degrees can be obtained by simply superposing two sets of lenses in a pair of glasses, and the requirements of various changes of diopter degrees in one section required by the existing vision correction cannot be met, so that the vision correction effect cannot be really realized.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve the unable shortcoming that realizes the diopter number at one section internal change of current glasses, provide a glasses.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a pair of glasses, include the picture frame, set up in lens group on the picture frame, set up in the mirror leg and the lens adjusting device of picture frame both sides, be equipped with in the mirror leg and be in the power of lens adjusting device power supply, first optics piece and the second optics piece that the stack set up around the lens group is including, lens adjusting device set up in on the picture frame and be used for the drive lens group, through lens adjusting device drive first optics piece with the relative movement of second optics piece in vertical direction.

Further, the picture frame includes the crossbeam and set up in the holding portion of crossbeam one side, lens adjusting device set up in the holding portion, the lens group set up in the holding portion with the crossbeam encloses to close in the space that forms.

Furthermore, the picture frame still including set up in the link of holding portion side, the picture frame passes through the link with the mirror leg is articulated, be equipped with the connecting hole on the link and make in the mirror leg the power with lens adjusting device in the holding portion is electric is connected.

Furthermore, lens adjusting device include with the circuit board that the power electricity is connected, by driving piece driven pivot and cover are located by the circuit board epaxial first fixing base and the second fixing base of pivot, first fixing base with the second fixing base can be along with the rotation of pivot is along vertical direction or back-to-back removal.

Furthermore, a notch arranged along the vertical direction is arranged on the side surface of the accommodating part, the first optical sheet extends into the accommodating part from the notch and is fixedly connected with the first fixing seat, and the second optical sheet extends into the accommodating part from the notch and is fixedly connected with the second fixing seat.

Further, be equipped with first screw thread and second screw thread that the interval set up on the outer periphery of pivot, first screw thread with the screw thread of second screw thread sets up opposite direction, be equipped with on the first fixing base with first screw hole of first screw thread meshing, be equipped with on the second fixing base with second screw thread meshing's second screw hole.

Further, the lens adjusting device further comprises a first support column arranged in parallel with the rotating shaft, a first connecting hole is formed in the first fixing seat, a second connecting hole is formed in the second fixing seat, the first fixing seat sleeve is arranged on the first support column through the first connecting hole, and the second fixing seat sleeve is arranged on the first support column through the second connecting hole.

Furthermore, the lens adjusting device further comprises a transmission assembly connecting the driving member with the rotating shaft, wherein the transmission assembly comprises a first transmission member sleeved on the driving member, a second transmission member sleeved on the rotating shaft, and an auxiliary assembly connecting the first transmission member and the second transmission member.

Further, the sub-assembly includes first sub-driving spare and second sub-driving spare of intermeshing, first sub-driving spare with first driving spare intermeshing, second sub-driving spare with second driving spare intermeshing, first sub-driving spare is fixed in through the second support column in the holding portion, second sub-driving spare passes through first support column is fixed in the holding portion.

Further, a switch is further arranged on the mirror frame, the switch is electrically connected with the two lens adjusting devices, the number of the accommodating parts is two, the number of the lens adjusting devices is two, a wire groove is formed in the cross beam, a connecting wire is arranged in the wire groove, and the connecting wire electrically connects the two lens adjusting devices.

The utility model provides a pair of glasses's beneficial effect lies in: a lens adjusting device is arranged on the lens frame, and the power supply arranged in the glasses legs provides electric energy for the lens adjusting device, so as to realize the automatic adjusting process of the relative movement of the first optical sheet and the second optical sheet on the lens in the vertical direction, several different combinations of lens dioptric effects can be produced by relative movement of the first optical sheet and the second optical sheet in the vertical direction on each set of lenses, thereby utilize the lens diopter of this kind of combination to zoom the training to eyes, zoom the training through wearing glasses and can help myope to promote the bore hole eyesight of training person or prevent that the ametropia appears in eyes, also can play the health care effect for the crowd that does not have myopia, play the effect that promotes the bore hole eyesight of training person or prevent that the ametropia appears in eyes.

Drawings

Fig. 1 is a schematic perspective view of glasses according to the present invention;

fig. 2 is a schematic perspective exploded view of a pair of glasses according to the present invention;

fig. 3 is a schematic perspective view of a lens adjusting device of glasses according to the present invention;

fig. 4 is a schematic perspective exploded view of a lens adjusting device of glasses according to the present invention.

In the figure: 100-glasses, 10-glasses frame, 11-beam, 12-receptacle, 121-notch, 13-connection end, 14-switch, 20-lenses, 21-first optical sheet, 22-second optical sheet, 30-glasses leg, 31-power supply, 40-lens adjustment device, 41-circuit board, 42-driving piece, 43-rotation shaft, 431-first screw, 432-second screw, 44-first fixing base, 441-first screw hole, 442-first connection hole, 45-second fixing base, 451-second screw hole, 46-first support column, 47-transmission assembly, 471-first transmission piece, 472-second transmission piece, 473-sub-assembly, 4731-first sub-transmission piece, 4732-second sub-transmission piece, 4733-second support column, 48-shell, 481-neck, 4811-first fixing hole, 4812-bearing, 4813-sensor, 4814-second fixing hole, 482-mounting seat, 483-base and 4831-end cap.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1-4, for the glasses 100 provided by the present invention, the glasses 100 can be used for zooming training of eyes, so as to relieve asthenopia, and improve the naked eye vision of the trainee or prevent the eyes from having ametropia. Specifically, as shown in fig. 1, the eyeglasses 100 include a frame 10, a lens group 20 provided in the frame 10, temples 30 provided on both sides of the frame 10, and a lens adjusting device 40. The lens group 20 disposed on the frame 10 is independently driven by the lens adjusting device 40, so that the lens 20 can realize the automatic cyclic reciprocating change of the diopter in the visual area of the eye, thereby achieving the uninterrupted adjustment of the diopter in a certain interval. Wherein, a power supply 31 for supplying power to the lens adjusting device 40 is arranged in the glasses leg 30 in the glasses 100, and the power supply 31 supplies power to the lens adjusting device 40, thereby realizing a full-automatic process. As shown in fig. 1, the lens group 20 of the glasses 100 provided by the present invention includes a first optical sheet 21 and a second optical sheet 22 stacked front and back, and the first optical sheet 21 and the second optical sheet 22 can realize the variation of different diopter degrees through the difference of the lens diopter degrees in the stacking area. The lens adjusting devices 40 are disposed in the frame 10 and are respectively used for driving the lens group 20, and the first optical sheet 21 and the second optical sheet 22 are driven to move relatively in the vertical direction by the lens adjusting devices 40. The first optical sheet 21 and the second optical sheet 22 are driven by the lens adjusting device 40 to move up and down in the vertical direction, so that the first optical sheet 21 and the second optical sheet 22 are completely overlapped and partially overlapped in the vertical direction.

Further, as shown in fig. 1, in the glasses 100 provided by the present invention, the glasses frame 10 includes a cross beam 11 and accommodating portions 12 disposed on two sides of the cross beam 11, the number of the accommodating portions 12 is one or two, preferably two, the number of the lens adjusting devices 40 is one or two, preferably two, the two lens adjusting devices 40 are disposed in the two accommodating portions 12 respectively, and the lens group 20 is disposed in a space formed by the two accommodating portions 12 and the cross beam 11. The bridge 11 of the frame 10 is used to fixedly connect the lenses 20 and the temples 30, and the lens adjusting devices 40 are placed through the receiving parts 12 such that the lens adjusting devices 40 can be disposed in the receiving parts 12 of the frame 10 and drive the relative movement of the lenses 20. The frame 10 further includes two connection terminals 13 provided on the side of the accommodating portion 12, the frame 10 is hinged to the temples 30 through the connection terminals 13, and the connection terminals 13 are provided with connection holes (not shown) so that the power supply 31 in the temples 30 is electrically connected to the lens adjusting devices 40 in the accommodating portion 12. The hinge joint of the connecting end 13 of the side of the spectacle frame 10 and the spectacle leg 30 is provided with a connecting hole, so that the power supply in the spectacle leg 30 can be electrically connected with the lens adjusting device 40 in the spectacle frame 10, and the automatic operation of the lens adjusting device 40 is realized. Meanwhile, the power supply 30 is arranged in the glasses legs 30, so that the weight of the power supply 31 can be equally divided to two sides, and the replacement of the power supply 31 can be facilitated.

Further, as shown in fig. 1, the frame 10 is further provided with a switch 14 electrically connected to the lens adjusting devices 40, the beam 11 of the frame 10 is provided with a wire slot (not shown), and a connecting wire (not shown) is provided in the wire slot, so that the two lens adjusting devices 40 are electrically connected by the connecting wire. The switch 14 is disposed on the outer side of the frame 10 to facilitate the user to turn on and off the lens adjusting device 40. And a thread groove is provided in the bridge 11 of the frame 10 so that the lens adjusting devices 40 positioned at both sides can communicate with each other and control and adjust the lenses 20 through the same switch 14.

Further, as shown in fig. 3-4, the perspective structure of the lens adjusting device 40 in the glasses 100 according to the present invention is schematically illustrated. As shown in fig. 3, the lens adjusting device 40 includes a circuit board 41 electrically connected to the power source 31, a driving member 42 controlled by the circuit board 41, a rotating shaft 43 driven by the driving member 42, and a first fixing seat 44 and a second fixing seat 45 sleeved on the rotating shaft 43, wherein the first fixing seat 44 and the second fixing seat 45 can move along a vertical direction along with the rotation of the rotating shaft 43. The driving member 42 drives the rotating shaft 43 to rotate in the lens adjusting device 40, so that the first fixing seat 44 and the second fixing seat 45 can move towards or away from each other in the vertical direction in the lens frame 10 by the rotation of the rotating shaft 43. In the present embodiment, the driving member 42 is a driving motor, and the driving motor drives the rotating shaft 43 to rotate, so that the component arranged on the rotating shaft 43 moves in the axial direction.

Specifically, as shown in fig. 2, the accommodating portion 12 is provided with notches 121 on opposite sides thereof, the first optical sheet 21 extends into the accommodating portion 12 from the notches and is fixedly connected to the first fixing seat 44, and the second optical sheet 22 extends into the accommodating portion 12 from the notches 121 and is fixedly connected to the second fixing seat 45. Two separate lens adjustment devices 40 are disposed in the receiving portion 12, and each lens adjustment device 40 independently adjusts the lens 20 on one side thereof. That is, each lens adjusting means 40 individually drives the first optical sheet 21 and the second optical sheet 22 on one side thereof. The first optical sheet 21 is fixed on the first fixing seat 44 of the lens adjusting device 40, and the second optical sheet 22 is fixed on the second fixing seat 45 of the lens adjusting device 40. When the driving member 42 in the lens adjusting device 40 drives the first fixing seat 44 and the second fixing seat 45 to move, the first optical sheet 21 and the second optical sheet 22 in the frame 10 are driven to move in the vertical direction. In the present embodiment, when the rotating shaft 43 rotates clockwise, the first fixing seat 44 and the second fixing seat 45 move relatively, so that the overlapping area between the first optical sheet 21 and the second optical sheet 22 gradually increases. When the rotating shaft 43 rotates counterclockwise, the first fixing seat 44 and the second fixing seat 45 move away from each other, so that the overlapping area between the first optical sheet 21 and the second optical sheet 22 gradually decreases. During the process of moving the first fixing seat 44 and the second fixing seat 45 towards each other, the overlapped area of the first optical sheet 21 and the second optical sheet 22 can synthesize a new combined lens diopter, and during the process of moving between the first fixing seat 44 and the second fixing seat 45 without stopping, the sight line of the eyes can pass through the overlapped area between the first optical sheet 21 and the second optical sheet 22 to observe things in front of the eyes. Therefore, the eye needs to be automatically equipped with the degree of the combination of the first optical sheet 21 and the second optical sheet 22 for observation, thereby performing a zoom training use for the eye.

Further, as shown in fig. 3 and 4, the lens adjusting device 40 has a first screw 431 and a second screw 432 spaced apart from each other on an outer circumferential surface of the rotating shaft 43, the first screw 431 and the second screw 432 are oppositely threaded, the first fixing seat 44 has a first screw hole 441 engaged with the first screw 431, and the second fixing seat 45 has a second screw hole 451 engaged with the second screw 432. The first fixing seat 44 and the second fixing seat 45 are respectively arranged on the rotating shaft 43, the first thread 431 and the second thread 432 which are arranged on the rotating shaft 43 are in threaded connection, when the first fixing seat 44 and the second fixing seat 45 are in threaded connection with the rotating shaft 43, the first fixing seat 44 and the second fixing seat 45 are prevented from rotating along with the rotating shaft 43, the lens adjusting device 40 further comprises a first supporting column 46 which is arranged in parallel with the rotating shaft 43, a first connecting hole 442 is formed in the first fixing seat 44, a second connecting hole is formed in the second fixing seat 45, the first fixing seat 44 is sleeved on the first supporting column 46 through the first connecting hole 442, and the second fixing seat 45 is sleeved on the first supporting column 46 through the second connecting hole. The first fixing seat 44 and the second fixing seat 45 are simultaneously sleeved on the rotating shaft 43 and the first supporting column 46, and the first fixing seat 44 and the second fixing seat 45 are meshed with the rotating shaft 43 through threads, so that in the rotating process of the rotating shaft 43, the first fixing seat 44 and the second fixing seat 45 can reciprocate along the axial direction of the first supporting column 46. Besides the setting directions of the first thread 431 and the second thread 432 are different, other parameters are consistent, so that the movement of the rotating shaft 43 between the first fixing seat 44 and the second fixing seat 45 is only the difference in the directions during the rotation, and the movement distance caused by each rotation is consistent, thereby ensuring that no area incapable of imaging occurs during the relative overlapping process between the first optical sheet 21 and the second optical sheet 22. And the arrangement of the first supporting column 46 makes the horizontal movement of the first fixing seat 44 and the second fixing seat 45 on the rotating shaft 43 more smooth and consistent.

Further, as shown in fig. 3 and 4, in the eyeglasses 100 provided in the present invention, the lens adjusting device 40 further includes a transmission assembly 47 connecting the driving member 42 and the rotating shaft 43, the transmission assembly 47 includes a first transmission member 471 sleeved on the driving member 42, a second transmission member 472 sleeved on the rotating shaft 43, and a sub-assembly 473 connecting the first transmission member 471 and the second transmission member 472. In this embodiment, the driving element 42 is a motor, the first transmission element 47 is sleeved on a transmission shaft of the motor, the second transmission element 47 is sleeved on an end portion of the rotating shaft 43, and the driving element 42 is in transmission connection with the rotating shaft 43 through the sub-assembly 47. The sub-assembly 47 not only can function as a rotational connection between the driving member 42 and the rotating shaft 43, but also can function as a rotational speed adjustment, so that the rotational speed output by the driving member 42 can be adjusted by changing the transmission ratio between the sub-assembly 473 and the first transmission member 471 and the second transmission member 472, and the rotational speed of the rotating shaft 43 can be ensured to meet the requirement of the relative moving speed between the first fixing seat 44 and the second fixing seat 45 by changing the rotational speed of the driving member 42 to the rotating shaft 43.

Specifically, the sub-assembly 473 in this lens adjusting device 40 includes a first sub-transmission member 4731 and a second sub-transmission member 4732 that are engaged with each other, the first sub-transmission member 4731 is engaged with a first transmission member 471, the second sub-transmission member 4732 is engaged with a second transmission member 472, the first sub-transmission member 4731 is fixed in the accommodating portion 12 by a second support column 4733, and the second sub-transmission member 4732 is fixed in the accommodating portion 12 by a first support column 46. One side of the first sub-transmission member 4731 of the sub-assembly 473 is drivingly connected to the first transmission member 471 and the other side is drivingly connected to the second sub-transmission member 4732. One side of the second secondary transmission member 4732 is drivingly connected to the first secondary transmission member 4731, and the other side is drivingly connected to the second transmission member 472. Wherein the first sub-transmission member 4731 is directly fixed in the accommodating portion 12 through the second support column 4733, and the second sub-transmission member 4732 is fixed on the end portion of the first support column 46. The first support column 46 functions only to fix the second sub-transmission member 4732. As shown in fig. 3, in the present embodiment, the first transmission member 471, the second transmission member 472, the first sub-transmission member 4731, and the second sub-transmission member 4732 are all gears that mesh with each other. Of course, the transmission components in the transmission assembly 47 may also be friction gears, transmission wheels, etc. capable of achieving speed regulation and mutual transmission.

Further, as shown in fig. 4, the present invention provides a lens adjusting device 40 in eyeglasses 100, further comprising a housing 48, wherein the housing 48 has a slot 481 for disposing the rotating shaft 43 and the first supporting column 46, a mounting seat 482 for fixing the driving member 42, and a base 483 for disposing the transmission assembly 47, and bottoms of the slot 481 and the mounting seat 482 are flush and all communicate with the base 483. The housing 48 is divided into three parts, wherein the locking groove 481 is used for fixing the rotating shaft 43 and the first supporting column 46, so that the first fixing seat 44 and the second fixing seat 45 can horizontally move in the locking groove 481. The mounting seat 482 is disposed outside the engaging groove 481, the mounting seat 482 and the engaging groove 481 are parallel to each other, and the bottoms of the mounting seat 482 and the engaging groove 481 are flush, so that a rotating shaft of the motor on the mounting seat 482 can extend into the base 483 to be connected to the transmission assembly 47, and the rotating shaft 43 and one end of the first support column 46 can also extend into the base 483 to be connected to the transmission assembly 47. An end cap 4831 is also provided on the base 483, and the end cap 4831 seals the entire drive assembly 47 within the base 483, closing the ends of the shaft 43 and the first support post 46, as well as the end of the drive member 42.

Specifically, the housing 48 has first fixing holes 4811 at both ends of the slot 481, and bearings 4812 for fixing the end of the rotating shaft 43 are disposed in the first fixing holes 4811. The rotating shaft 43 can rotate with the driving member 42 in the slot 481, so that both ends of the rotating shaft 43 are fixed in the first fixing holes 4811 on both sides of the slot 481 through the bearings 4812, and one end of the rotating shaft 43 passes through the first fixing hole 4811 and enters the base 483 to be connected with the transmission assembly 47. The two ends of the locking groove 481 are further provided with second fixing holes 4814, the first supporting column 46 plays a role of limiting the rotation of the first fixing seat 44 and the second fixing seat 45 in the locking groove 481, so that the first supporting column 46 is fixed in the locking groove 481, and the two ends of the first supporting column 46 are respectively inserted into the two second fixing holes 4814 at the two sides of the locking groove 481. Wherein the bottom of the first support column 46 passes through the second fixing hole 4814 into the base 483 to connect with the driving assembly 47.

The utility model provides a pair of glasses 100, a lens adjusting device 40 is arranged on a glasses frame 10, and the power supply 31 arranged in the glasses leg 30 supplies power to the lens adjusting device 40, so as to realize the automatic adjusting process of the relative movement of the first optical sheet 21 and the second optical sheet 22 on the lens 20 in the vertical direction, several different combinations of lens dioptric effects can be produced by relative movement of the first optical sheet 21 and the second optical sheet 22 in the vertical direction on each set of lenses 20, therefore, the combined diopter of the lenses is used for zooming training of the eyes, and the glasses 100 are worn to zoom training, so that the myopia patients can be helped to improve the naked eye vision of the trainee or prevent the ametropia of the eyes, the health care effect can be achieved for the people without myopia, and the functions of improving the naked eye vision of the trainee or preventing the ametropia of the eyes are also achieved.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. The utility model provides a pair of glasses, its characterized in that, include the picture frame, set up in lens group on the picture frame, set up in the mirror leg and the lens adjusting device of picture frame both sides, be equipped with in the mirror leg and be the power of lens adjusting device power supply, first optics piece and the second optics piece that the lens group set up including the front and back stack, lens adjusting device set up in on the picture frame and be used for the drive lens group, through the drive of lens adjusting device first optics piece with the relative movement of second optics piece in vertical direction.

2. The eyeglasses according to claim 1, wherein the frame comprises a bridge and a receiving portion disposed on one side of the bridge, the lens adjustment device is disposed in the receiving portion, and the lens group is disposed in a space defined by the receiving portion and the bridge.

3. The eyeglasses according to claim 2, wherein said frame further comprises a connecting end disposed on the side of said housing, said frame being hinged to said temple by said connecting end, said connecting end being provided with a connecting hole for electrically connecting said power supply in said temple to said lens adjustment means in said housing.

4. The eyeglasses according to any one of claims 2 to 3, wherein the lens adjusting device comprises a circuit board electrically connected to the power source, a driving member controlled by the circuit board, a rotating shaft driven by the driving member, and a first fixing seat and a second fixing seat sleeved on the rotating shaft, wherein the first fixing seat and the second fixing seat can move towards or away from each other along a vertical direction along with the rotation of the rotating shaft.

5. The eyeglasses according to claim 4, wherein the side surface of the receiving portion is provided with a notch arranged along a vertical direction, the first optical sheet extends into the receiving portion from the notch to be fixedly connected with the first fixing seat, and the second optical sheet extends into the receiving portion from the notch to be fixedly connected with the second fixing seat.

6. The eyeglasses according to claim 4, wherein the outer circumferential surface of the rotating shaft is provided with first threads and second threads which are arranged at intervals, the threads of the first threads and the second threads are arranged in opposite directions, the first fixing base is provided with a first threaded hole engaged with the first threads, and the second fixing base is provided with a second threaded hole engaged with the second threads.

7. The eyeglasses according to claim 4, wherein the lens adjusting device further comprises a first support pillar disposed parallel to the rotation shaft, the first fixing seat is provided with a first connecting hole, the second fixing seat is provided with a second connecting hole, the first fixing seat is sleeved on the first support pillar through the first connecting hole, and the second fixing seat is sleeved on the first support pillar through the second connecting hole.

8. The eyeglasses according to claim 7, wherein the lens adjusting device further comprises a transmission assembly connecting the driving member with the rotating shaft, the transmission assembly comprising a first transmission member sleeved on the driving member, a second transmission member sleeved on the rotating shaft, and a sub-assembly connecting the first transmission member and the second transmission member.

9. An eyeglass according to claim 8 wherein the sub-assembly comprises a first and second mutually engaging sub-drive member, the first sub-drive member being mutually engaged with the first drive member and the second sub-drive member being mutually engaged with the second drive member, the first sub-drive member being secured in the receptacle by the second support post and the second sub-drive member being secured in the receptacle by the first support post.

10. The eyeglasses according to claim 2, wherein said frame further comprises a switch electrically connected to said lens adjustment devices, said receiving portions are two, said lens adjustment devices are two, said cross member comprises a wire slot, and said wire slot comprises a connecting wire, said connecting wire electrically connecting said two lens adjustment devices.

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