Abstract:
Detecting a quantity of a product remaining in a reservoir subjected, during use of the product, to a driving movement. The reservoir is driven in accordance with reference signals representing target movements. The reference signals including at least one test reference signal. The position of the reservoir in response to the test reference signal is detected. The quantity of product remaining in the reservoir is determinable from the detected position. Alternatively, a change in temperature caused by moving the reservoir in response to the test reference signal is detected, and the quantity of product remaining in the reservoir is determinable from the change in temperature.
Abstract:
In order to monitor the state of a reservoir made of electrically insulating material containing a normally electrically conductive product, ink for example, the free end of the outlet channel of the reservoir is connected to a predetermined potential and two measurement procedures are defined, the first of which results in a first measurement signal, a characteristic of which varies mainly with the quantity of product contained in the storage cavity of the reservoir, and the second of which results in a second measurement signal, a characteristic of which varies mainly with the electrical conductivity of the channel between its ends.During the measurements, an abnormality correction procedure (or a simple alarm procedure) is triggered when the characteristic of the second measurement signal indicates a low electrical conductivity of the channel (absence of product) whilst the characteristic of the first signal indicates that there is still product in the storage cavity.
Abstract:
A device determines a quantity of product present in a reservoir, particularly a quantity of ink in the reservoir (112) of an image formation device, such as a printer (10). In a preferred embodiment, the devices includes means (120, 113, 123) of connecting the said product to a predetermined potential, means (121, 122) of establishing a first electrical field through the product, and adapted to establish a second electrical field different from the first electrical field, means (122), of measuring electrical fields in order to produce first and second electrical signals representing electrical fields, and means (100) of processing the first electrical signal in order to produce a signal representing the quantity of product, and adapted to process the second electrical signal in order to detect the interruption of the connection of the product to the predetermined potential, the said interruption corresponding to a predetermined quantity of product present in the reservoir (112).
Abstract:
In order to monitor the consumption of a normally electrically conductive product contained in a storage chamber of a reservoir made of electrically non-conductive material, the storage chamber is disposed in a capacitive arrangement and a measurement procedure is defined, according to which, in response to an excitation signal applied to the capacitive arrangement, a measurement signal is obtained (at 122), one characteristic of which has an amplitude which varies substantially with the quantity of product contained in the storage chamber. Before deducing the value of information representing the quantity of product available in the reservoir from this amplitude, the measurement signal has filtering applied to it, according to which it is multiplied by a reference signal of frequency at least approximately equal to that of the excitation signal (at 121) and the multiplied signal is applied to a low-pass filter.
Abstract:
Determination of the quantity of consumable product present in a reservoir, for example the quantity of ink present in the reservoir of an inkjet printing device. According to the invention, the movable reservoir can be engaged in the dielectric space of a capacitor consisting of two plates, a signal generator applies a signal to the capacitor and the reservoir is moved, a comparator changes state when a threshold is reached and the distance travelled by the reservoir makes it possible to determine the quantity of product situated therein.
Abstract:
Device for determining quantities of products contained in adjacent ones of plural reservoirs, by using a capacitive arrangement. According to the invention, two electrodes of the capacitive arrangement are disposed between two reservoirs and are in each case either sending electrodes to which a signal is applied, or receiving electrodes which transmit a signal. By virtue of this arrangement, it is possible to reduce parasitic coupling between different capacitors of the capacitive arrangement.
Abstract:
According to a first aspect, the invention relates to the transmission of an "initial" sequence of at most 2.sup.n numbers, where n is a predetermined natural number, representing binary data modulating a predetermined physical quantity, characterized in that, successively:an "encoding" phase consists of adding to the initial sequence two "coherence" numbers to form a "total transmitted" sequence whose binary data are the subject of the said modulation, the two coherence numbers being determined so that two predetermined "coherence check" combinations applied to a total transmitted sequence each give a predetermined modulo P value, where P is a number more than 2.sup.n,a "decoding" phase consists of applying the said combinations to the numbers of the total received sequence and, where the results of the said combinations are not equal to the said predetermined modulo P values, deducing therefrom that a transmission error has occurred.
Abstract:
Printing method and device enabling a low energy level to be indicated while extending the consumption duration and number of pages printed for a predetermined quantity of energy. According to the invention, detection of a predetermined quantity of energy remaining in an energy source (37) is interpreted by the control means (28) to switch to a printing mode which saves energy so as to indicate to the user an impending lack of energy, while using that which remains sparingly.
Abstract:
Detecting presence or absence of product in a reservoir by transmitting a signal affected by the product. The signal is detected from among other signals with which it is subsequently received by discrimination and delivery of an output signal whose level is set by the discrimination, and by sampling. Pairs of samples are correlated to obtain a true correlation value SR, where the instantaneous value of correlation between the state value B(i) and the state value B(i+Z) is summed, Z being the number of samples taken during a period T of the signal to be detected. A rate calculation is performed, during which the rate &rgr; of samples representing the presence of the signal is measured, and theoretical correlation mean values are evaluated. A decision is made by comparison of the true correlation value SR with each theoretical correlation mean value.
Abstract:
In order to determine a distribution of product present in a reservoir (112), particularly a distribution of ink in the reservoir of an image transfer device, a device includes electrodes (121, 122) disposed in contact with the product in the reservoir, a circuit (117) for successively supplying the electrodes with an excitation signal (SE) causing an electromagnetic radiation from the product, a receiving antenna (116) for sensing the electromagnetic radiation caused by the respective supplying of the electrodes, and a circuit (115) for processing the radiation sensed into a signal representing the distribution of product contained in the porous body inside the reservoir.