JPH0416723B2 - - Google Patents

Abstract

In a recording arrangement for simultaneously recording a broad line diagram to be read by the human eye and an extremely thin line diagram to be exclusively microscopically evaluated, a multilayer record carrier comprising a metallic covering layer and an underlying intermediate layer which is plastically deformable by heat and pressure is moved beneath a spring mounted rigid spark electrode with a rounded point which burns through the metallic layer to form the broad line diagram and impresses the thin line diagram in the underlying plastically deformable intermediate layer by a combination of heat and pressure. The arrangement is used in vehicle tachographs.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a multi-layer record carrier that can be driven in a time-dependent manner and at least one recording device that can be controlled perpendicularly to the feeding direction of the record carrier, the conical tip of the recording device being The present invention relates to a recording device for recording a macro-trace formed in the intermediate layer of a record carrier by a side surface extending to , and a micro-trace formed by the leading edge of a recording device, which forms approximately the center line of the macro-trace.

As is well known, the recording idea is to record relatively fast changes in measured values on a record carrier that moves at a relatively fast speed.
The recording resolution and, therefore, the ability to evaluate instantaneous values are not satisfactorily compatible with the original purpose of recording. However, reconciling relatively fast changes in measured values with relatively slow movement speeds of the record carrier is necessary because construction and integration issues as well as operational and control requirements take precedence, and for this reason small records It is necessary to realize the idea of recording with a record carrier having a large area and with as long a transport time as possible.

An example of such a recording condition is the known driving recorder, whose record carrier, which is generally a tachograph disc, has to detect the driving conditions of the motor vehicle and the working time data of the driver. In particular, when considering accident evaluation, it is required that the resolution of the speed graph to be recorded, that is, the evaluation accuracy, is high.In other words, since the feeding speed of the record carrier is relatively small, the graph generally has a high linear density perpendicular to the feeding direction of the record carrier. must be recorded as a fine line graph with high precision, which can no longer be read with the naked eye or without difficulty. Furthermore, in order to enable a rapid inspection by police officers, at least other graphs, for example working time graphs, can be easily read with the naked eye without optical aids, so-called list graphs (a proven display method is the well-known bar graph). Emphasis must be placed on recording the information as However, speed graphs can also provide decisive information if their readability is improved, for example to make instantaneous judgments about the driving method. In this case, the purpose is to determine overspeeding, all characteristics of the speed record that give information about economical driving methods, or the load on the motor vehicle by driving and stopping times. Since these information in the speed graph are trends, limits or maximum values and their frequency, the desired improved readability does not necessarily require an enlargement of the speed record, but simply a wider width of the record line. be. Such measures, given the same feed speed of the record carrier, can
Although this will result in a fusion of individual recording lines,
Apart from the problem of accident evaluation, for example, the above information of the speed graph can be sufficiently obtained from the envelope of the fused speed graph.

Therefore, not only are different demands placed on the various graphs on the tachograph disk of the odometer, but also highly contradictory demands are placed on one and the same graph, in this case the speed graph. i.e. 1
One is that such a graph is not only readable with the naked eye, but also provides a relatively easy overview of the whole.
If possible, it is required to have a certain degree of signal effect, and secondly, the graph is required to be displayed in the form of a thin line graph that can only be evaluated with a microscope, and to enable highly accurate temporal analysis.

As is well known, the second requirement is in the case of a driving recorder.
Tachograph discs are generally provided with a relatively soft wax or wax-like recording layer, and this is satisfactorily achieved by using as recording device, in particular a resiliently supported recording pen with a stone tip. In this case, especially tachograph discs, apart from the fact that such recording surfaces are easily damaged and have a particularly low handling stability, and therefore there is a possibility of falsifying the recording by abrasions and scratch marks due to dust particles. One must acknowledge the drawback that fingerprints are unavoidable when handling. In order to avoid this drawback, coatings made of materials such as lacquer have been used, but the negative effect of these coatings on the recording quality is even greater.

Of course, the first requirement can be fulfilled quite easily in terms of recording technology. This is because a number of recording methods, including wax layer recording methods, are suitable for producing comparatively wide recording lines by suitable formation of the recording device. On the contrary, in order to realize the desired combination of graph display, i.e. 1
can be easily read with the naked eye, at least with respect to certain information, as a so-called macrograph;
Furthermore, great difficulties must be overcome in order to be able to evaluate with high precision using optical auxiliary means as a so-called micrograph.

German Patent No. 1095531 discloses a relatively soft recording layer on a substrate or carrier material and a hard and brittle layer which breaks down during the recording process.
Works have been described that solve this objective by means of record carriers in which these layers are color-differentiated from one another. It is readily apparent that the recording quality achievable with such record carriers is unsatisfactory. This is because destruction of the covering layer is accompanied by large scattering, and there is a risk that the recording device will slip on the covering layer, for example during vibrations and sudden changes in the measured value, and the recording will be interrupted.
Although this solution satisfactorily guarantees the handling stability requirements, the disadvantage arises that the dust formed by the destroyed recording layer contaminates the recording device considerably and reduces the quality of the recording.

In contrast, according to the invention, the recording carrier used consists of a substrate, a plastically deformable intermediate layer on the substrate, and a covering layer of a combustible metal covering said intermediate layer, and the recording device is rounded. The design as a spring-supported, rigid electrode with a leading edge has the advantage that the metallization layer, which is of course stable in handling, evaporates without residue during the recording process or is displaced in the molten state.

It is further advantageous that the burn-out problem which is harmful to the electrodes, which is widely known in the case of metal paper recording methods, is eliminated in the case of the recording method according to the invention by the rounded leading edge of the recording device, which is decisive for creating micro-marks. is exposed to the combustion process only at the beginning of the recording process, i.e. it bites into the soft intermediate layer of the most advanced recording carrier of the recording device and moves, so to speak, like a plow, under the deformation of the intermediate layer without producing chips. During this time, the burning of the metal coating layer and the formation of macroscopic traces are carried out by the side surface leading to the conical tip of the recording device.
Mostly avoidable.

In this case, the macroscopic trace becomes a thick line due to the specific annular area formed when the metallization layer burns, and on the other hand, the leading edge of the recording device is also heated during the combustion process, so that the most extreme The movement of the tip under pressure due to the contact pressure of the recording device, which is spring-supported in the intermediate layer, and thus the formation of micro-marks that reflect the incident light at the bottom of the conical groove forming the macro-marks is facilitated.

In this connection, it is further pointed out that burnout and heating of the leading edge of the recording device can be minimized by a suitable current supply to the recording device, for example a pulsating current.

An arbitrarily selected recording example shows that if the leading edge of the recording device has a spherical rounded leading edge with a radius of 0.05 mm and extends conically from there, a macro trace with a width of 0.1 to 0.3 mm is created on the intermediate layer. A thick line and a micro trace at the middle line position, a so-called subgraph with a width of about
A thin line of 0.005mm is shown.

From this, another advantage of the recording device according to the invention is clear, namely that it is also particularly suitable for the dense recording of digital data on record carriers that can only be read optically, for example by means of a laser beam.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a sector-shaped fragment of a tachograph disc 1 which serves as a record carrier, which disc is driven in the device, for example in the direction of the arrow P as a function of time. In the case of a travel recorder, the recording line marked 2 on the tachograph disk 1 represents the speed course of the vehicle in which this recording type is installed. The grid that is usually printed on such tachograph discs and the time scale, which is particularly necessary for visual evaluation, have been omitted for clarity of illustration. Recording electrode 3
(This is a steel pin because electrical conductivity is required.) is arranged on a slider 4 that can be slid in the radial direction relative to the disk 1, as is customary in running recorders, and the slider itself is connected to a guide rod 5 fixed to the recorder. and 6. A gear 7 is formed on the slider 4, by means of which the slider 4 is driven according to the measured value or speed. The recording device 3 is arranged on a support bridge 8, in this case insulating, which is fixed to the slider 4 in the conventional manner. The recording force is obtained by a compression spring 9,
One end of this spring is attached to one leg of the support bridge 8;
The other end is supported by a washer 10 fixed to the shaft of the recording electrode 3. Similarly fixed to the axis of recording electrode 3,
The recording electrode 3 is connected to one pole of a power source (not shown) by the clamp 11 of the conductive wire 12, and the other pole is electrically conductively connected to the gold inner coating layer 13 of the tachograph disk 1. Contact is achieved by brushes, but preferably via fixing and interlocking means in the center of the disc 1.

FIG. 2 shows a cross section of the multilayer tachograph disc 1 and the recording electrode 3, for example at the leading edge of a recording device constructed as described above. In this case, the leading edge of the recording electrode 3 bites into the metallization layer 13 and the plastically deformable intermediate layer 14 and, under the action of the compression spring 9, approaches the carrier 15 of the relatively rigid paper material of the tachograph disc 1.

FIG. 3 shows macroscopic traces a that can be evaluated with the naked eye and microscopic traces that can be observed with a microscope by smoothing the intermediate layer 14 on the recording carrier 15 with a rounded recording tip when recording as described above. b is formed. The metallization layer 13, which provides handling stability, evaporates almost without residue.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a recording device according to the present invention, and FIG.
The figure shows a cross section of the tachograph disk and the leading edge of the recording device, and FIG. 3 is an enlarged plan view of recording traces on the tachograph disk. 1... Tachograph disc, 2... Graph, 3
...Recording electrode, 4...Slider, 9...Compression spring, 12...Conducting wire, 13...Metal coating, 14...
Middle layer, 15...Record carrier.

Claims (1)

[Claims] 1 having a multi-layer record carrier that can be driven in a time-dependent manner and at least one recording device that can be controlled at right angles to the direction of transport of the record carrier; In a recording device for recording a macro-trace formed therein and a micro-trace formed by the leading edge of a recording device, which forms approximately the center line thereof, the record carrier comprises a substrate and a plastically deformable intermediate layer on the substrate; A recording device comprising a coating layer of combustible metal covering the intermediate layer, and characterized in that the recording device is configured as a spring-supported rigid electrode with a rounded leading edge.