CN217522637U

CN217522637U - Telescopic device

Info

Publication number: CN217522637U
Application number: CN202220247976.9U
Authority: CN
Inventors: 邢益涛
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-02-01
Filing date: 2022-02-01
Publication date: 2022-09-30
Anticipated expiration: 2032-02-01

Abstract

A telescopic device is characterized by comprising a first shell, a second shell and an elastic membrane for connecting the first shell and the second shell; the elastic film between the first area and the second area is pre-stretched, and the pre-stretching length is not less than 102% of the natural length of the elastic film; the elastic membrane is stretched into a configuration resembling the contour of a frustum of a cone as the first housing and the second housing are moved apart.

Description

Telescopic device

Technical Field

The invention relates to a method for realizing a telescopic device, in particular to a technical scheme for realizing the telescopic effect by using a pre-stretched elastic film material.

Background

After the apple inc, promoted iPhone12, a wireless charging system using a planar dual-pole magnet surrounding a coil spring type coil became a major trend in the mobile phone industry.

On the other hand, the back of the traditional mobile phone is generally adhered with auxiliary accessories such as finger ring buckles, Popsockets air bag supports and the like, so as to help users to easily hold the mobile phone.

However, the ring buckle, the Popsockets airbag support and the like conflict with the magnetic attraction wireless charging, if some mobile phone auxiliary accessories are attached to the back of the mobile phone, sufficient magnetic attraction force cannot be generated due to the fact that the distance between the magnet in the wireless charger and the magnet in the mobile phone is greatly increased, the distance between the coil spring coil in the wireless charger and the coil spring coil in the mobile phone is greatly increased, the battery coupling efficiency is sharply reduced, and therefore the ideal magnetic attraction alignment and fixed high-efficiency wireless charging function cannot be achieved.

Therefore, there is a need to design a new auxiliary device for a mobile phone that does not affect or even enhance the magnetic attraction effect, does not affect or has negligible effect on the electromagnetic coupling efficiency, and can help users to easily and comfortably hold the mobile phone.

Disclosure of Invention

The invention discloses a telescopic device, which is characterized in that the device is in a sheet shape when not used and is in a three-layer three-dimensional structure similar to a hamburger when used, and the device is structurally characterized by comprising a first shell, a second shell and an elastic membrane for connecting the first shell and the second shell; the elastic membrane is made of a non-conductor material; the elastic film is in one or any combination of three forms of flat single-layer net shape, complete and flat sheet shape or complete sheet shape with multiple circles of wave-shaped concentric circles in a natural state, and the average wave crest H of the wave-shaped concentric circles is smaller than or equal to the average wavelength L of the wave-shaped concentric circles; the outer edge of the elastic membrane is provided with at least one first area mechanically fixed with the second shell, and the range close to the center of the elastic membrane is provided with at least one second area mechanically fixed with the first shell; the elastic film between the first area and the second area is pre-stretched, and the pre-stretching length is not less than 102% of the natural length of the elastic film; the elastic membrane is stretched into a configuration resembling the contour of a frustum of a cone as the first housing and the second housing are moved apart.

Due to the shape of the conical table, the first shell, the second shell and the elastic film form a shape which is convenient for clamping a thumb and a forefinger, a forefinger and a middle finger or any two fingers, when the first shell or the second shell of the device is fixed at the back of the mobile phone, a user can conveniently and easily hold the mobile phone, and the stem part of the elastic film is made of elastic materials, so that the device is more comfortable.

Therefore, the telescopic device disclosed by the invention achieves the aim of helping a user to easily and comfortably hold the mobile phone when being attached to the back of the mobile phone.

Since a retractable device disclosed in the present invention has a certain thickness when not in use, the distance between the coil spring coil in the wireless charger and the coil spring coil in the mobile phone is reduced and the battery coupling efficiency is lowered. The invention therefore provides a telescopic device, further comprising a first soft magnetic material of low reluctance for a high-frequency alternating magnetic field, which is mechanically fixed to one of the first housing or the second housing, and which is located in the region of the mechanical connection of the elastic membrane to the first housing when the first housing and the second housing are not moved away from each other. The first soft magnetic material is used for helping the coil spring coil in the wireless charger and the central area of the coil spring coil in the mobile phone to establish a transmission channel with low magnetic resistance of a high-frequency alternating magnetic field, so that the coupling efficiency of the battery is kept high.

The telescopic device disclosed by the invention has a certain thickness when not used, so that the distance between the magnet in the wireless charger and the magnet in the mobile phone can be increased, the magnetic attraction force is obviously weakened, and more than 70% of plastic sheets with the same thickness in actual tests can be weakened, so that the magnetic attraction function has no practical use value. Therefore, the retractable device disclosed by the invention has the advantages that the second soft magnetic material is provided with at least one soft magnetic material unit, the soft magnetic material units are basically distributed between the inner ring and the outer ring of the imaginary first circular ring in space, the diameter of the inner ring of the first circular ring is not more than 52mm, the diameter of the outer ring of the first circular ring is not less than 48mm, the second soft magnetic material can be adsorbed by an external magnet, and the magnetic attraction force which is the same as or close to that of the external magnet for directly adsorbing the mobile phone is achieved, so that the problem that the magnetic attraction force is seriously weakened due to the thickness is solved. And the center of the first circular ring and the center of a circumscribed circle of the projection of the first soft magnetic material on the plane of the first circular ring are distributed in a circumference with the diameter not more than 15 mm.

Meanwhile, the second soft magnetic material has the characteristic of low magnetic resistance of a high-frequency alternating magnetic field, and is used for helping a transmission channel with the low magnetic resistance of the high-frequency alternating magnetic field to be established in the outer area of the coil spring coil in the wireless charger and the outer area of the coil spring coil in the mobile phone, so that low-loss transmission of electromagnetic coupling alternating magnetic field energy in wireless charging is facilitated, and particularly low-loss transmission of the alternating magnetic field energy generated by the part of the wireless charging coil in the mobile phone, the size of which exceeds 46mm, is facilitated.

In order to reduce the cost, the second soft magnetic material is generally made of iron, steel and silicon steel, the iron, the steel and the silicon steel generate obvious eddy current loss in a wireless charging high-frequency alternating magnetic field, and the eddy current loss is proportional to the cubic equation of the cross section size of the metal material, so that the eddy current can be obviously reduced by the method for reducing the size of a single soft magnetic material unit. Because the most of the external magnetic field of the wireless charging system for the mobile phone is concentrated on the inner side of a circle with the radius of 25mm, any soft magnetic material unit of the second soft magnetic material with the length exceeding 10mm in the circumferential direction of the first ring is provided with a notch, the distance from the root of the notch to the circle center of the first ring is not less than 25mm, and the length of any soft magnetic material unit on the two sides of the notch in the circumferential direction of the first ring is not more than 10 mm.

Therefore, the invention has the advantages of simultaneously realizing the purposes of not influencing or even enhancing the magnetic attraction effect, not influencing or influencing the electromagnetic coupling efficiency negligibly and helping a user to hold the mobile phone easily and comfortably.

Drawings

Fig. 1 is an oblique view of the present invention in a natural state.

Fig. 2 is an axial sectional view of the present invention in a natural state.

Fig. 3 is a schematic view of the stretched state of the present invention and the grip of a human hand.

Fig. 4 is an oblique view of the elastic membrane of the first embodiment of the present invention in a natural state.

Fig. 5 is an axial cross-sectional view of the elastic membrane of the first embodiment of the present invention after stretching.

Fig. 6 is an oblique view of an elastic membrane of a second embodiment of the present invention in a natural state.

Fig. 7 is an axial cross-sectional view of an elastic membrane of a second embodiment of the invention after stretching.

Fig. 8 is an oblique view of an elastic membrane of a third embodiment of the present invention in a natural state.

Fig. 9 is an axial sectional view of an elastic membrane of a third embodiment of the present invention in a natural state.

Fig. 10 is an axial cross-sectional view of an elastic membrane of a third embodiment of the invention after stretching.

Fig. 11 is a first embodiment of the second soft magnetic material of the present invention.

Fig. 12 is a second embodiment of the second soft magnetic material according to the invention.

Fig. 13 is a fourth embodiment of the present invention in a folded state.

Fig. 14 is an extended state of the fourth embodiment of the present invention.

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention and do not limit the application scope of the present invention, and it is obvious for a person skilled in the art to apply the present invention to other similar scenes according to the drawings without creative efforts; as used in this specification and the appended claims, the singular forms "a", "an", and/or "the" include plural referents unless the context clearly dictates otherwise. In general, the terms "comprises" or "comprising" merely indicate that steps and elements are included which are explicitly identified, but do not constitute an exclusive list, and that a method or apparatus may also comprise other steps or elements. The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment".

In order to reduce the thickness of the retractable device in the natural state as much as possible and avoid the difficulty in placing the mobile phone (for example, inserting the mobile phone into a relatively compact pocket) caused by the excessive thickness when the retractable device is attached to the back of the mobile phone, as shown in fig. 1 and 2, the outer dimension of the first shell 1 is designed to be smaller than the inner dimension of the second soft magnetic material 5, so that the first shell 1 and the second soft magnetic material 5 are substantially in the same plane in the natural state and the first shell 1 is half surrounded by the second shell 3. Meanwhile, the second shell 3 is provided with a hole or a groove structure, so that mechanical interference with the elastic membrane 2 is avoided. While the second housing 3 is provided with an opening or a recess with a shape matching the first soft magnetic material 4 close to the central area.

As shown in fig. 3, after the device of the present invention is stretched, the elastic membrane 2 is stretched to form a tapered platform, where the user's fingers 7 can be held from side to side. And as shown in fig. 3, by fixing the first soft magnetic material 4 on the side of the first shell 1 facing the second shell 3, it is possible that after the device according to the invention has been stretched, the first soft magnetic material 4 is protected inside by the elastic membrane 2, protected from external damage, and a mechanical support of the first shell 1 is obtained. Embodiments of the first soft magnetic material 4 may be a hard solid soft magnetic material, such as sintered ferrite, or may be a soft magnetic material, such as a wound amorphous, nanocrystalline thin film. The first soft magnetic material 4 may be fixed to the side of the second housing 3 facing the first housing 1, and the fixed position of the first soft magnetic material 4 is set so as not to interfere with the position where the elastic membrane 2 is fixed to the first housing 1 when the first housing 1 and the second housing 3 are substantially overlapped.

As shown in fig. 4, 6 and 8, the elastic membrane 2 is a flat single-layer net, a complete and flat sheet, or a complete sheet having multiple wave-shaped concentric circles in a natural state. As shown in fig. 9, the average peak H of the wave-shaped concentric circles is equal to or less than the average wavelength L of the wave-shaped concentric circles. In fig. 5, 7 and 10, the elastic film 2 is stretched to form a shape similar to a volcanic cone in axial cross section.

Inside the second casing 3, the second soft magnetic material 5 may be a plurality of single soft magnetic material units as shown in fig. 11 or a plurality of internal teeth-like soft magnetic material units as shown in fig. 12, which are substantially distributed between the inner and outer rings of the imaginary first circular ring in space. Any soft magnetic material unit of the second soft magnetic material 5 needs to be provided with a notch when the length of the soft magnetic material unit exceeds 10mm in the circumferential direction of the first ring, the notch is manufactured into an internal tooth-shaped structure, the distance from the root of the notch to the center of the first ring is not less than 25mm, and the length of the soft magnetic material units on two sides of any notch in the circumferential direction of the first ring is not more than 10 mm.

The second shell 3 may also be provided with a magnet unit 6 inside, and the surface of the magnet unit 6 substantially parallel to the plane of the first circular ring has two opposite magnetic poles, namely a magnetic pole a and a magnetic pole B, and the magnetic pole a is closer to the center of the first circular ring than the magnetic pole B.

Since the magnets in some devices provided with matching magnets are not complete rings but are C-shaped with notches, in order to better achieve magnetic attraction between the device of the present invention and the device provided with matching magnets in a real use environment, the magnet structure of fig. 12 includes at least one pair of symmetrically arranged magnet units, and the angle a between the line connecting the center points of at least one pair of the magnet units and the vertical axis L of the telescopic device in use is not less than 3 °.

In some cases, the device needs to provide temporary support for the mobile device of the user, such as a mobile phone, so that as shown in fig. 14, a ring-shaped structure 8 capable of being turned over is arranged on the outer side of the second housing 3, and the ring-shaped structure 8 and the second housing 3 are connected through a rotating structure. And when the ring-shaped structure 8 and the second housing 3 are folded together, as shown in fig. 13.

Claims

1. A telescopic device is characterized by comprising a first shell, a second shell and an elastic membrane for connecting the first shell and the second shell;

the elastic film is made of a non-conductor material;

the elastic film is in one or any combination of three forms of flat single-layer net shape, complete and flat sheet shape or complete sheet shape with multiple circles of wave-shaped concentric circles in a natural state, and the average wave crest H of the wave-shaped concentric circles is smaller than or equal to the average wavelength L of the wave-shaped concentric circles;

the outer edge of the elastic membrane is provided with at least one first area mechanically fixed with the second shell, and the range of the elastic membrane close to the center is provided with at least one second area mechanically fixed with the first shell;

the elastic film between the first area and the second area is pre-stretched, and the pre-stretching length is not less than 102% of the natural length of the elastic film;

the elastic membrane is stretched into a configuration resembling the contour of a tapered frustum as the first housing and the second housing are moved away.

2. A retractable device as set forth in claim 1, further comprising a first soft magnetic material of low reluctance to high frequency alternating magnetic fields, said first soft magnetic material being mechanically fixed to one of said first housing or said second housing, and said first soft magnetic material being located within a region of mechanical connection of said flexible membrane to said first housing when said first housing and said second housing are not remote therefrom.

3. A telescopic device according to claim 2, wherein the second housing has a second soft magnetic material of low reluctance to the high frequency alternating magnetic field, the second soft magnetic material having at least one second soft magnetic material element, the second soft magnetic material element being substantially distributed in space between an inner and an outer circumference of an imaginary first circular ring, the inner circumference of the first circular ring having a diameter of not more than 52mm and the outer circumference of the first circular ring having a diameter of not less than 48mm,

the center of the first ring and the center of a circumscribed circle of the projection of the first soft magnetic material on the plane of the first ring are distributed in a circumference with the diameter not more than 15 mm.

4. A telescopic device according to claim 3, wherein any unit of soft magnetic material with a length in the circumferential direction of the first ring exceeding 10mm has a notch, the root of the notch is not less than 25mm from the center of the first ring, and the units of soft magnetic material on both sides of any notch have a length in the circumferential direction of the first ring not exceeding 10 mm.

5. A retractable device as set forth in claim 3 wherein said second housing has a magnet structure including at least one magnet unit disposed substantially between said inner and outer races of said first ring.

6. A telescopic device according to claim 5, wherein at least one of said magnet units has two opposite poles, respectively a pole A and a pole B, on a surface substantially parallel to the plane of said first ring, and wherein pole A is located closer to the centre of said first ring than pole B.

7. A telescopic device according to claim 5, wherein said magnet structure comprises at least one pair of magnet units, said magnet units being symmetrically arranged such that the line joining the centre points of at least one pair of said magnet units makes an angle a of not less than 3 ° with the axis L of said telescopic device in a vertical orientation when in use.

8. A telescopic device according to claim 1, wherein the second housing is provided with a reversible outer ring structure on the outside, said outer ring structure being connected to said second housing by a rotating mechanism.