DE10058693C1 - Data memory for identification of handled part has memory chip and annular antenna coil supported within annular housing via 2-part spacer - Google Patents

Abstract

The data memory (1) has a memory chip electrically coupled to an annular antenna coil (3), supported within an annular housing (4) via at least one spacer (5), provided by 2 rings (5a,5b), between which the memory chip and the antenna coil are sandwiched. Both the latter are spaced from the housing by at least 1 mm, the spacer having a lower heat conduction coefficient than the annular housing.

Description

The invention relates to a data storage device for identification moving parts, with a memory chip, one elec trisch connected annular antenna coil and one Ring housing, in the hollow annulus of the memory chip and the antenna coil by means of at least one spacer are held at a distance from the ring housing.

Such a data storage is, for example, by DE 198 57 722 A1 has become known.

For industrial manufacturing processes or logistic processes automatic identification systems are often used puts. As a rule, the process is carried out through the use of such systems in the first place make economic sense. On such a system consists on the one hand of an identification egg nes industrial asset or part of production and on the other hand from a reading station for reading the license plate voltage. This label can e.g. B. an optically readable Barcode or an electromagnetically readable mobile Da memory (MDS). In automotive production, MDS before assembling the body e.g. B. at the bottom group attached and described with sales and production data,  then everyone during the assembly of the body can be read out directly from the MDS and for production control can be used.

From the aforementioned DE 198 57 722 A1 a trans ponderring with ring antenna and electronic data carrier known for marking compressed gas cylinders. The electro African disk has a retaining ring in its high lem annulus of electronic data carriers and antennas coil spaced by means of a trough-shaped carrier Ring housing are held. The retaining ring is made of malleable Material such as plastic, especially thermoplastic Made of plastic.

A mobile data memory OIS-L is also known from the "Auto-ID Systems" brochure ( 1998 ) from Baumer Ident GmbH. This data memory OIS-L essentially comprises a memory chip (e.g. EEPROM) with suitable electronics and an annular antenna coil electrically connected to it, both of which are surrounded by a casing. Reading or reading data from or into the memory chip is carried out by a reading station via alternating magnetic fields at frequencies in the kHz, MHz or GHz range.

If an MDS is used several times for the same process it depends on the required number of ma maximum possible process runs. The required number is on the order of a few thousand. With certain processes can be caused by the ambient temperature Ovens, thermal radiation from machines etc., significantly higher than normal room temperature. So at automotive production the drying of paints z. B. at  Temperatures higher than 200 ° C, while the well-known mobile Data storage OIS-L can only be used up to 85 ° C.

It is therefore the object of the invention to have a data memory to improve the type mentioned in such a way that esp especially the memory chip and its electronics Outside temperatures higher than 85 ° C before heat is protected.

This object is achieved in that the Spacer is formed from two spacer rings, between which the memory chip and the antenna coil axially are arranged, and that the memory chip and the antennas coil spaced at least 1 mm from the ring housing are.

The advantage achieved by the invention is that temperature sensitive parts of the data storage, such as. B. the memory chip and its electronics, not in the annulus immediate touch of yourself in hot surroundings first warming ring housing are held. The warming of the Memory chips and its electronics are therefore delayed against the heating of the ring housing.

In particularly preferred embodiments of the invention is the at least one spacer including memory chip and Antenna coil inserted loosely in the annulus.

The coefficient of thermal conductivity is used to minimize heat conduction ent of the spacer  smaller than that of the ring housing. The thermal conductivity The spacer is as efficient as possible less than 0.07 W / mK (200 ° C) or 0.035 W / mK (20 ° C). satisfactory Test results were made with thermal insulation spacers BASOTEC from BASF.

The ring housing can consist of at least two housing parts be put together. It is preferably made of two ring housings halves axially joined, being on the outer edge and / or Inner edge of one half of the ring housing a ringför for the outer edge or inner edge of the others Ring housing half can be provided. For intrusion of liquid through seams in the annulus each joining seam is the one joined to form the ring housing Housing parts from the outside, e.g. B. by means of a strip-shaped Seal, sealed.

To reduce heat conduction, the annulus of the Ring housing to be evacuated.

The ring housing is preferably made of a thermoplastic forms and should, especially if there is no one else Outer housing is surrounded, at least 180 ° C, preferably be heat-resistant up to at least 220 ° C.

In preferred embodiments of the invention that is Ring housing, however, encased by an outer housing all around. The outer casing can have better properties than the ring housing, especially higher mechanical resistance stability, higher tightness against liquids, higher chemical resistance to aggressive chemicals kalien, such as z. B. are present in immersion baths, higher Temperature resistance or less release of impurities  of liquids. Ideally, the outer face If possible, include all of these properties.

The outer housing can e.g. B. formed by a thermoset be up to at least 180 ° C, preferably up to at least at least 220 ° C, is heat-resistant.

Further advantages of the invention result from the Be writing and drawing. Likewise, the above mentioned and invented the features further invented in accordance with the invention individually for themselves or for several in be arbitrary combinations are used. The shown and The embodiment described is not intended to be final Understanding enumeration, but rather has exemplary Character for the description of the invention.

It shows:

FIG. 1 shows a data memory according to the invention in a top view; and

Fig. 2 is a half section through the inventive Since space A according to II in FIG. 1.

The data memory 1 shown in Fig. 1 comprises a SpeI cherchip 2 and a connected annular transformants nenspule 3 with a plurality of turns. Memory chip 2 and antenna coil 3 are arranged in the hollow annular space of an annular housing 4 and therein at least one spacer 5 be spaced apart from the annular housing 4 . The spacer 5 is formed by two spacer rings 5 a, 5 b, between which the memory chip 2 and the antenna coil 3 are arranged axially. Two matable to the ring housing 4 Ringge housing halves 4 a, 4 b of a thermoplastic material defining the annular space, in which the two spacer rings 5 a, 5 b together with the memory chip 2 and the antenna coil 3 are loosely inserted. Since after the two ring housing halves 4 a, 4 b z. B. materially connected by ultrasonic welding. The two resulting annular seams are sealed from the outside by means of sealing strips 6 . The ring housing 4 is encased all around by an outer housing 7 made of Duro plast, which has been pressed around the outside of the ring housing 4 ver.

This structure of the data memory 1 , the memory chip 2 and the antenna coil 3 are thermally separated by the spacer 5 from the surrounding ring housing 4 . To minimize heat conduction in the annular space of the ring housing 4 , the thermal conductivity of the spacer is as small as possible than that of the ring housing 4 and as small as possible less than 0.07 W / mK (200 ° C) or 0.035 W / mK (20 ° C). Because of this thermal insulation, the heating of the memory chip 2 and its electronics is delayed compared to the heating of the ring housing 4th

A used for the identification of moving parts data memory 1 with a memory chip 2 and an electrically connected annular antenna coil 3 has for thermal protection, in particular the memory chip 2, an annular housing 4 , in the hollow annulus of the memory chip 2 and the antenna coil 3 by means of at least one From spacer 5 are held spaced from the ring housing 4 . The ring housing 4 is preferably encased in a heat-resistant outer housing 7 all around from up to at least 180 ° C., preferably up to at least 220 ° C.

Claims (13)

1. Data memory ( 1 ) for identifying moving parts, with a memory chip ( 2 ), an electrically connected annular antenna coil ( 3 ) and an annular housing ( 4 ), in the hollow annular space of the memory chip ( 2 ) and the antenna coil ( 3 ) by means of at least one spacer ( 5 ) spaced from the ring housing ( 4 ), characterized in that the spacer ( 5 ) from two spacers gene ( 5 a, 5 b) is formed, between which the memory chip ( 2 ) and the antenna coil ( 3 ) are axially angeord net, and that the memory chip ( 2 ) and the antenna coil ( 3 ) are each spaced at least 1 mm from the ring housing ( 4 ). 2. Data memory according to claim 1, characterized in that the at least one spacer ( 5 ) including the memory chip ( 2 ) and antenna coil ( 3 ) is loosely inserted into the annular space. 3. Data memory according to one of the preceding claims, characterized in that the thermal conductivity of the spacer ( 5 ) is smaller than that of the Ringgehäu ses ( 4 ). 4. Data storage device according to one of the preceding claims, characterized in that the thermal conductivity coefficient of the spacer ( 5 ) is less than 0.07 W / mK (200 ° C) or 0.035 W / mK (20 ° C). 5. Data memory according to one of the preceding claims, characterized in that the ring housing ( 4 ) is assembled from at least two housing parts, preferably before axially assembled from two ring housing halves ( 4 a, 4 b). 6. Data memory according to claim 5, characterized in that that on the outer edge and / or inner edge of a ringge half of the house each have an annular receptacle for the Outer edge or inner edge of the other half of the ring housing is provided. 7. Data memory according to one of the preceding claims, characterized in that each joint seam of the ring housing ( 4 ) joined housing parts is sealed abge. 8. Data memory according to one of the preceding claims, characterized in that the annular space of the ring housing ( 4 ) is evacuated. 9. Data memory according to one of the preceding claims, characterized in that the ring housing ( 4 ) is formed from a thermoplastic. 10. Data memory according to one of the preceding claims, characterized in that the ring housing ( 4 ) is heat-resistant up to at least 180 ° C, preferably up to at least 220 ° C. 11. Data memory according to one of the preceding claims, characterized in that the annular casing (4) is wrapped round to by an outer casing (7). 12. Data memory according to claim 11, characterized in that the outer housing ( 7 ) is formed by a thermoset ge. 13. Data memory according to claim 11 or 12, characterized in that the outer housing ( 7 ) is at least 180 ° C, preferably up to at least 220 ° C, heat constantly.