FR3084501A1 - UNIVERSAL LABEL RADIO DOOR DEVICE FOR OPTICAL GLASSES MOUNTS IN ORDER TO AVOID THE PERTUBATION OF MAGNETIC FIELDS WHICH MAY BE INTRODUCED BY THE COMPOSITION OF THE MOUNTS - Google Patents

Abstract

Universal radio label holder device specific to optical spectacle frames, with the object of avoiding the disturbance of the magnetic fields which can be introduced by the composition of the frames (a) which are located near the radio label (b), characterized: - In its design by two sub-assemblies: a first sub-assembly (c) made of low density polyethylene whose permittivity value at 20 ° C is established at 0.28 while the dielectric dissipation factor at 20 ° C is from 0.0001, a second polycarbonate subset (d) whose permittivity value at 20 ° C is established at 2.97 while the dielectric dissipation factor at 20 ° C varies from 0.0001 to 0.0005, these two sub-assemblies being assembled to each other in order to contain the radio label between the two sub-assemblies, - A minimum spacing of 5 mm (e) between the mount (a) and the radio label (b ) contained in the label holder.

Description

Title: Radio-label support for metal spectacle frames

DESCRIPTION

The present invention relates to the field of labeling of eyeglasses used by opticians, and relates more particularly to label holders supporting a radio label.

State of knowing

The state of knowledge is characterized by several invention patents relating either to the principle of radio tag more commonly called “TAG” based on a radio frequency identification technology (called “RFID”), or to the support of this label.

Relating to invention patents linked to the emission and reception of radio waves to the subject of radio labels or, more broadly, of radio frequency identification, the most relevant are:

Patent WO2016156533 which describes the various organs of the support and of the principle of emission of waves,

Other patents mention the transmission-reception principles: FR3024620 / W02016016405 relates to the multi-signal RFID principle, FR3035225 / WO2016169837 geolocation and satellite antenna transmission,

- Still other patents mention the principles of the radio tag support device: EP2734695 describes the principle of an RFID support that can be attached to objects by a point but does not address the problem of interference with objects, W02015011401A2 hooking two separate parts of an RFID support,

- Finally, a patent cites principles of use for different radio tags: FR2999321 relating to a reading terminal which is not fixed to an object.

In the field of radio label support, the present applicant filed in 2017 a patent application N ° 1700017 relating to a universal label support device for optical and sunglasses frames receiving an adhesive label characterized by a polymer technology flexible and with shape memory, receiving in its mass an invisible electronic chip programmable and reprogrammable to infinity in order to be able to be used at will, and comprising a system of attachment at these two ends in order to be able to slip on any type of lens branch.

It turned out that the radio tag technology was disturbed by the proximity of the metal spectacle frames receiving the label holders, in that the metal spectacle frame absorbs part of the radio frequencies emitted, which prevents communication between the radio frequency transmitter and receiver present in the store and the chip contained in the radio label.

In the field of scientific laws, the principles of electromagnetic waves allowing an exchange between the antennas of transmitters and receivers are known according to the law of Biot and Savart, which indicates that any conductor traversed by an electric current remotely creates a field magnetic. By integrating the law of Biot and Savart, one can calculate the magnetic field (in Am-1) created by the current of intensity I traversing a turn of radius r on a point of the axis of the turn located at a distance d .

We also know that objects near the receiver antenna can disturb the waves received or emitted.

As much as there are electromagnetic wave protection devices of the faraday cage type which cancel the wave transmission, conversely no known device makes it possible to avoid the disturbance of the wave transmissions to allow the best possible operation.

It is for the purpose of finding a satisfactory solution to this drawback in the field of radio labels specific to spectacle frames, and more particularly when the latter are made of materials capable of disturbing magnetic fields, that the present invention is intended.

Presentation of the invention

The invention relates to a universal radio label holder device (FIG. 1) specific to frames for optical glasses, with the object of avoiding the disturbance of the magnetic fields which can be introduced by the composition of the frames (a) which are near the radio label (b), characterized:

- In its design by two sub-assemblies: a first sub-assembly (c) made of low density polyethylene whose permittivity value at 20 ° C is established at 0.28 while the dielectric dissipation factor at 20 ° C is 0 .0001, a second polycarbonate subset (d) whose permittivity value at 20 ° C is established at 2.97 while the dielectric dissipation factor at 20 ° C varies from 0.0001 to 0.0005, these two subassemblies being assembled to each other for the purpose of containing the radio label between the two subassemblies,

- A minimum spacing of 5 mm (e) between the frame (a) and the radio label (b) contained in the label holder.

The selected components are characterized in that:

- Low density polyethylene has low values in permittivity and dielectric dissipation, while its mechanical resistance is reduced,

Polycarbonate by lower permittivity and dielectric dissipation values than low density polyethylene, but by mechanical qualities capable of ensuring a rigidity in the label holder allowing it to be held over time.

Figure 1: open view of the device

Glossary:

a) Frame

b) radio tag

c) low density polyethylene subassembly

d) polycarbonate sub-assembly

e) minimum spacing of 5 mm

Claims (1)

1. Universal radio tag door device specific to optical spectacle frames, with the object of avoiding disturbance of the magnetic fields which may be 5 introduced by the composition of the mounts (a) which are located near the radio tag (b), characterized: In its design by two subsets: a first subset (c) of low density polyethylene whose permittivity value at 20 ° C is set at 0.28 while the dielectric dissipation factor at 20 ° C is 0, 0001, a second subset 10 (d) of polycarbonate whose permittivity value at 20 ° C is established at 2.97 while the dielectric dissipation factor at 20 ° C varies from 0.0001 to 0.0005, these two subassemblies being assembled to each other for the purpose of containing the radio label between the two subassemblies, A minimum spacing of 5 mm (e) between the mount (a) and the radio label (b) 15 contained in the label holder.