baber/WOPTO huggingface dataset:
Patent FR-2497410-A1 (FR)
Title: Integrated circuit microstrip transmission line mfr. - uses common dielectric substrate where lines are machined to different thicknesses to present different characteristic impedances
Inventor: COUTANT CLAUDE
IPC: H05K1/02
Filed: 1980-12-29
Abstract: The assembly has a common dielectric substrate, (DC) for three circuit modules, (M1,2,3) having a thickness equal to that of the thickest section (T2) required. The substrate is hollowed out at the locations for the modules (17,3) to have a partic. thickness (T1,T3) while two openings (E4,E5) are formed in the substrate to have defined depths. On the plane face (P) of the substrate a ground layer (CM) is located while on the hollowed face (R) are located the conducting strips (C1-5). The layers and strips are formed from copper foil which is glued into position using a thermoplastic adhesive to form the microstrip transmission line couplings between modules operating at different frequencies and requiring different substrate thicknesses.
Patent FR-2498297-A1 (FR)
Inventor: ROL PASCAL
IPC: F21V14/04
Filed: 1981-01-16
Abstract: A dipped beam headlamp for all motor vehicles has a reflector (500), a lamp (L) and, acting between the latter and cooperating with them, a dim-out cap (C) for producing the dipped beam whose boundary line is determined by the edges of the dim-out cap (C). The dim-out cap (C) has a reflecting inner surface which is configured, without substantially altering the edges which normally determine the boundary line or the low-beam cutoff, in such a way that the useful light beams are reflected in priority directions which extend towards the upper section of the reflector (500), in particular avoiding the bulb (B) of the lamp (L).
Patent FR-2474053-A1 (FR)
Title: Fructose prodn. from chicory roots - by extraction and hydrolysis of inulin
Inventor: KERKHOFFS PIETER LAURENS
IPC: D01G13/00
Filed: 1981-01-22
Abstract: Prodn. of fructose (I) is carried out by (a) extracting inulin (II) from the dried roots of chicory (Chicorium intybus var. foliosum) and (b) hydrolysing (II) to (I) in an aq. medium. Chicory roots are an inexpensive by-prod. which is available for 7-8 months of the year on a commercial scale; they generally contain 6-10 wt.% (II). The roots remaining after cutting the 2nd-year growth (chicons) are washed, comminuted, and extracted with water. The aq. extract is then hydrolysed with an acid or esp. with an inulinase enzyme (e.g. derived from Saccharomyces fragilis or Fusarium roseum). (I) can be recovered in solid form by evapn. and/or crystallisation, or it can be used as a conc. aq. soln. Fl.
Patent FR-2499097-A1 (FR)
Title: Compsns. for cleaning hands, etc. - comprising vegetable-derived absorbent and detergent
IPC: C11D3/382
Filed: 1981-02-05
Abstract: Compsns. for cleaning the hands and other parts of the skin comprise a mixt. of a vegetable-derived absorbent powder and a detergent. The absorbent is pref. corn flour. The detergent can be anionic, cationic, nonionic or amphoteric. The compsns. pref. contain 85-95% absorbent and 5-15% detergent, opt. together with a bactericide or fungicide and/or a dye. The compsns. are esp. useful for removing oil and grease picked up from machinery, etc. They are easy to use, non-abrasive, and do not harm the skin.
Patent FR-2477085-A1 (FR)
Title: Dispositif pour regler une ferrure de ceinture de securite fixee a la carrosserie d'un vehicule
Inventor: HIPP KARL HEINZ
IPC: B60R22/20
Filed: 1981-02-19
Abstract: A.L'INVENTION CONCERNE UN DISPOSITIF POUR REGLER UNE FERRURE 3 DE CEINTURE DE SECURITE 3A ASSEMBLEE AVEC LA CARROSSERIE 1 D'UN VEHICULE COMPORTANT UN ORGANE DE REGLAGE 4 ARRETE DANS LA DIRECTION DE CHARGE DE LA CEINTURE PAR UN ORGANE D'ARRET 6 A ENCLENCHEMENT AUTOMATIQUE. B.CE DISPOSITIF EST CARACTERISE EN CE QUE LE DISPOSITIF 2 ETOU L'ORGANE D'ARRET 6 COMPORTENT DES MOYENS POUR SUPPRIMER AUTOMATIQUEMENT L'ACTION D'ARRET LORS DU DEPLACEMENT DE L'ORGANE DE REGLAGE DANS LA DIRECTION OPPOSEE A LA CHARGE. C.L'INVENTION EST APPLICABLE NOTAMMENT AUX VEHICULES DE TOURISME.
Patent FR-2500402-A1 (FR)
Title: Fold up bicycle trailer - has two wheels and oscillating drawbar with telescopic arm to allow cycle balance with trailer stability
IPC: B62K27/12
Filed: 1981-02-25
Abstract: The bicycle trailer has a tubular chassis, supported by two side wheels and a drawbar. The drawbar oscillates to allow the cyclist to balance the cycle without affecting trailer stability. A spring shock absorber is fitted to a rod, fixed to the bicycle. The wheels (45) can take up two positions, one for running and one out of use. One oscillating section (26) forms a luggage carrier when out of use. The drawgear has an adjustable telescopic arm in two parts locked in a collar.
Patent FR-2479239-A1 (FR)
Title: Procede de fabrication de polyurethane moule par injection avec reaction en utilisant un systeme catalytique a base d'etain
Inventor: DOMINGUEZ RICHARD JOSEPH GILBE
IPC: C08G18/22
Filed: 1981-03-31
Abstract: PROCEDE DE FABRICATION D'UN ELASTOMERE DE POLYURETHANE DANS LEQUEL ON INJECTE UN POLYISOCYANATE AROMATIQUE, UN POLYOL D'UN POIDS EQUIVALENT SUPERIEUR A 500, UN AGENT ALLONGEUR DE CHAINE CONSTITUE D'UN COMPOSE CONTENANT DE L'HYDROGENE ACTIF AYANT UN POIDS MOLECULAIRE FAIBLE AYANT AU MOINS DEUX FONCTIONNALITES, ET UN SYSTEME CATALYTIQUE AU MOYEN D'UNE MACHINEMIR DANS LA CAVITE D'UN MOULE DE FORME CHOISIE. LE SYSTEME CATALYTIQUE COMPREND UNE AMINE TERTIAIRE FAIBLE, UN CATALYSEUR ORGANOETAIN DE GELIFICATION RAPIDE ET UN CATALYSEUR ORGANOETAIN A ACTION DIFFEREE. APPLICATION A LA CONSTRUCTION DES CARROSSERIES D'AUTOMOBILES.
Patent FR-2493946-A1 (FR)
Title: Split link for chain - is locked together with dowel held centrally by spring clip fitting in groove
Inventor: NIEDERGRIESE REINER
IPC: F16G15/04
Filed: 1981-04-17
Abstract: The chain link is in two halves (1,2). One end is forked and the other end will fit in the fork. Each of the end joints is bored to take a shear pin (3). The pin is located by a split spring clip (4). The clip is split longitudinally (6) and has two circumferential slits to form a central lug (7). The lug is sprung over a central throat (5) in the dowel pin. The end lugs (9) are held tightly over the dia. of the pin.
Patent FR-2483311-A1 (FR)
Title: Appareil et procede pour la fabrication de lentilles ophtalmiques moulees
Inventor: RAMIREZ PETER R
IPC: B29D11/00
Filed: 1981-05-25
Abstract: DES LENTILLES MULTIFOCALES COULEES L SONT PRODUITES A PARTIR DE PARTIES DE MOULE A MEPLAT 16, ELLES-MEMES MOULEES A PARTIR D'UNE MATRICE MERE 28 AYANT UNE SURFACE DE MOULAGE FAITE DE LA JUXTAPOSITION DE COMPOSANTS DE MATRICE 48 ET 50 DONT CHACUN EST SURFACE AVEC PRECISION A LA COURBURE ET AU FINI CORRESPONDANT A CEUX QUE L'ON DESIRE DONNER A LA SURFACE MULTIFOCALE DEVANT ETRE COULEE. LES COMPOSANTS DE MATRICE 48 ET 50 SONT DISPOSES L'UN PAR RAPPORT A L'AUTRE DE TELLE MANIERE QUE LE MEPLAT 52 OCCUPE LA POSITION VOULUE ET QU'IL AIT LA HAUTEUR DEMANDEE.
Patent FR-2508350-A1 (FR)
Title: Portable mechanical plating device - with brushes or absorbent pads movable relative to workpiece surface
IPC: B05C17/00
Filed: 1981-06-29
Abstract: A portable mechanical plating device consists of a housing, at least one mechanical plating member movable relative to the housing and having a plating surface (e.g. a brush or absorbant surface) which can be moved relative to and urged against a workpiece surface, and a holding and guiding device for movement of the plating device by the operator. Plating is carried out by moving the device into an operative position with the plating surface urged against the workpiece, supplying a mixt. of mechanical plating promoter and plating metal particles to the plating surface, and moving the plating member relative to the housing and the workpiece surface. The device is portable and may be manually operated to produce top quality solid metallurgically integrated coatings to the desired depth in very short times.
Patent FR-2486690-A1 (FR)
Title: Vehicle security locking system
Inventor: SOSS DAVID A
IPC: E05B49/00
Filed: 1981-07-10
Abstract: The system for preventing the unauthorised operation of a vehicle or entry into a dwelling house or the like includes a transmitting unit and a receiving unit. The receiving unit is mounted and concealed inside the vehicle or dwelling house and the transmitting unit is a hand-held portable, self powered, device, which generates a magnetic field over a limited range that varies according to a uniquely coded sequence. - When the transmitting unit is in close proximity to the receiving unit, the presence of the varying magnetic field will be sensed by the receiving unit. If correctly coded it will allow power to flow from a power source to an enabling element of the device to be secured, e.g. the vehicle's ignition system or a solenoid valve located in the vehicle's fuel line.
Patent FR-2486637-A1 (FR)
Title: Refrigerateur a tunnel pour materiau en pieces
Inventor: CLIFTON DENNIS EDWARD
IPC: F25D3/11
Filed: 1981-07-15
Abstract: UN REFRIGERATEUR POUR PORTER UN MATERIAU EN PIECES (FRAGMENTS DE PNEU PAR EXEMPLE) A TEMPERATURE CRYOGENIQUE COMPREND UN TUNNEL 6 AYANT UNE ENTREE 2 ET UNE SORTIE 12, ET UN PASSAGE QUI ENTOURE AU MOINS PARTIELLEMENT LE TUNNEL. UN CONVOYEUR PERFORE 3 S'ETEND LE LONG DU TUNNEL ET TRANSPORTE LE MATERIAU DE L'ENTREE A LA SORTIE. DES MOYENS DE PULVERISATION PLACES A PROXIMITE DE LA SORTIE INTRODUISENT UN FLUIDE CRYOGENIQUE DANS LE TUNNEL. UN VENTILATEUR 7 ASPIRE DU GAZ PROVENANT DU TUNNEL ET L'ENVOIE DANS LE PASSAGE, D'OU LE GAZ REVIENT DANS LE TUNNEL A TRAVERS LE CONVOYEUR. UNE CLOISON 20 EST DISPOSEE DANS LE PASSAGE ENTRE LES MOYENS DE PULVERISATION ET LE VENTILATEUR POUR EMPECHER LE GAZ SOUFFLE PAR LE VENTILATEUR DE PASSER DANS LA PARTIE DU PASSAGE QUI ENTOURE LES MOYENS. UN RIDEAU SOUPLE A PLUSIEURS PANS 25, 26 EST PREVU A LA SORTIE DU TUNNEL POUR FREINER LE PASSAGE DE GAZ A TRAVERS LA SORTIE 12.
Patent FR-2509629-A1 (FR)
Title: Tri:metallic catalyst for reforming, etc. - contains a platinum group metal, indium, and manganese, molybdenum or technetium on e.g. alumina
Inventor: FRANCK JEAN-PIERRE
IPC: C10G35/09
Filed: 1981-07-16
Abstract: A catalyst comprises (in wt.% w.r.t. the support): 0.05-0.6 (esp. 0.1-0.5) wt.% of a noble metal of the Pt family; 0.05-4 (esp. 0.2-0.8) In; 0.005-3 of one or more of Mn, Mo and Tc (esp. 0.2-0.5 of Mn and/or Tc); 0.1-15 of a halogen; and a support. Also claimed is the use of the catalyst in isomerisation of aromatics and paraffins, hydrocracking, hydrodealkylation and steam dealkylation of aromatics, and esp. in reforming and aromatics prodn. from gasolines. The catalyst is pref. used as a moving bed. Catalyst activity and life are increased. Under the severe conditions of reforming to high -octane gasoline (min. index 102, clear), hydrogenolysis is reduced.
Patent FR-2511160-A1 (FR)
Title: Dose-meter for ionising radiation, esp. gamma rays or neutrons - includes probe contg. several radiation sensors inside protective sheath, and probe reader
Inventor: SERT JUDE-THADDEE PERCIE DU
IPC: G01T1/02
Filed: 1981-08-04
Abstract: The appts. includes a sensor probe (a), and a probe reader (b), both of which can be suspended from a belt on a human body or other object. Probe (a) consists of a rod contg. two polished recesses. In one recess is a rod made of photoluminescent glass sensitive to thermal neutrons, whereas the other recess contains a photoluminescent glass rod sensitive to gamma rays. Probe (a) also contains a semiconductor sensitive to fast neutrons, and/or an X-ray sensor. Probe (a) is located in a removable sheath permeable to the radiation being measured but protecting the probe from rain or gas. Each probe (a) can be inserted in a tubular reader (b) contg. measuring devices for monitoring the photoluminescent glass- and other sensors in probe (a). An inexpensive appts. which is not affected by rain, dust or gas, so accurate measurements are always obtd.
Patent FR-2511955-A1 (FR)
Title: Mains voltage electrical generator using vehicle motor - has sliding sleeve locking together coaxial engine and alternator shafts for electricity generation
IPC: F16D11/10
Filed: 1981-08-28
Abstract: The arrangement includes an alternator which may be driven by the engine of a vehicle in order to provide a 220v AC supply. The shaft of the alternator and the output shaft of the engine are mounted in an adjustable chassis and lie in line. A sleeve which is attached to the alternator shaft is arranged to slide, so that it may engage the driving shaft of the engine and tbus link the two parts together. In its rest position the sleeve is withdrawn and covers only the alternator shaft. A boss fits over the smaller dia. alternator shaft in order to bring it up to the same size as the engine shaft. The boss, and the engine shaft have longitudinal grooves to prevent rotation relative to the sliding sleeve, when the two parts are linked together.
Patent FR-2490695-A1 (FR)
Inventor: ALLERDISSEN K H
IPC: E04B5/04
Filed: 1981-09-21
Abstract: The invention relates to a composite structure comprising prefabricated reinforced-concrete crossmembers and prefabricated reinforced-concrete floor units for reinforced-concrete skeleton structures. The aim of the invention is a considerable saving in reinforcement (approximately 30%) in the prefabricated reinforced-concrete crossmembers and/or a reduction in the structural dimensions of crossmember height and floor height or an increase in the crossmember span with an additional reduction of the necessary concrete material. The problem was, by redistributing the stresses, to reduce the shear forces between prefabricated reinforced-concrete crossmembers and prefabricated reinforced-concrete floor units and to permit prefabricated reinforced-concrete crossmembers and prefabricated reinforced-concrete floor units to act as T-beams. The redistribution of the forces is effected in that between the end sides of the prefabricated reinforced-concrete floor units, on the prefabricated reinforced-concrete crossmembers, there is arranged in situ concrete which has been forced into the openings of the prefabricated reinforced-concrete floor units and in which reinforcement members project out of the prefabricated reinforced-concrete crossmembers, and in that the tension-reinforcement members of the prefabricated reinforced-concrete crossmembers are fastened on steel angles on the end sides of the prefabricated reinforced-concrete crossmembers. The ratio of the height of the prefabricated reinforced-concrete floor units to the height of the entire T-beam has to be -1/3. The invention can be used for all reinforced-concrete skeleton structures in construction work for industry and public buildings. The essence of the invention can best be seen from Figures 1 and 3.
Patent FR-2513238-A1 (FR)
Title: Wet process phosphoric acid prodn. - in which initial decomposition of phosphate(s) is effected with sulphuric and phosphoric acids, recycled sludge and air in a dispersed system
IPC: C01B25/228
Filed: 1981-09-24
Abstract: Prodn. of phosphoric acid compriseds decomposition of phosphates with sulphuric and phosphoric acids to form a sludge contg. phosphoric acid and crystalline calcium sulphate hemi-hydrate or dihydarate, followed by sepn. of the phosphoric acid from the sludge is characterised in that the initial decomposition of the phosphates is effected: (a) with a mixt. of sulphuric and phosphoric acids and part of the sludge, which is recycled to the decomposition stage with air in the form of a dispersed system, in which the wt. ratio of the dispersed phase to dispersing medium is 1/0.09-0.16, or b) with the mixt. of sulphuric and phosphoric acids with air added separately in the form of a dispersed system, in which the weight ratio of the dispersed phase and the dispersing medium is 1/0.2-0.3, and the dispersed recycled sludge with air added separately in a wt. ratio of 1/0.07-0.08 or c) with a mixt. of sulphuric and phosphoric acids with air in the form of a dispersed system in which the wt. ratio of the dispersed phase to dispersion medium is 1/0.1-0.55. Product is useful in a wide range of industries e.g. fertiliser, feedstuffs, polymer, uranium extraction, chemical, pharmaceutical, pesticide etc.
Patent FR-2494523-A1 (FR)
Inventor: KUCHARCZYK ECKHARD
IPC: H02P23/10
Filed: 1981-11-13
Abstract: The drive motor (2) is provided with a main winding (3) and the auxiliary winding (4), in front of which the operating capacitor (5) is located. The object is to improve the circuit arrangement such that the motor (2) operates with low losses at a low rotation speed, rotation noise and heating being reduced. For this purpose, the auxiliary winding (4) and the main winding (3) can be selectively connected to the power supply (7), directly or via an auxiliary capacitor (8), via a first switch (6). When the auxiliary capacitor (8) is connected, a non-reactive resistor (11), which is connected in series with a diode (10), is at the same time connected in parallel with the auxiliary winding (4) by means of a second switch (9) which is coupled to the first switch (6).
Patent FR-2516743-A1 (FR)
Title: Grape harvester with leaf and stalk extraction - uses blowers and rotating permeable drum over flat head section of inclined conveyor
IPC: A01D46/28
Filed: 1981-11-23
Abstract: The grape-gathering harvester uses a reception passage (24) with an inclined floor (26) to house a row of plants (16) being treated, the passage being equipped with plates (28) for shaking the plants. The floor leads the fruit to a lateral passage (18) containing a conveyor (40) feeding an output conveyor (20), the lateral passage accommodating means of separating leaves and stalks from the fruit. The first conveyor rises on an incline (40b) to terminate in a horizontal run (40c) over the foot of the output conveyor, its housing accommodating blowers and a revolving permeable drum (46). One blower (50) moves air in the opposite direction to the movement of the first conveyor, a second blower (44) moves air through an opening by the drum, and a third (52) further promotes the outgoing flow.
Patent FR-2517269-A1 (FR)
Title: Attachment of tarpaulin to lorry - uses elastic cables inserted into lower edges which locate over hooks on load platform
Inventor: CHERAULT MICHEL
IPC: B60P7/04
Filed: 1981-11-27
Abstract: The tarpaulin is supported by hoops placed along the load platform and incorporates removable side and end panels. Each panel (5) contains a sleeve (10) along its inside lower edge (9) housing an elastic cable (12) the ends of which form loops (13). The loops project out of the sleeve through openings (14) each positioned near a vertical edge of the panel whilst intermediate parts can be exposed through longitudinal slots in the sleeve. The loops and exposed parts of the cable (12) locate over hooks (16) provided on the periphery of the load platform to hold the tarpaulin in position.
Patent FR-2498295-A1 (FR)
IPC: F17C9/02
Filed: 1981-12-18
Abstract: A vaporiser for gas from liquid petroleum comprises a metal body having a high coefficient of thermal expansion and mutually communicating chambers in its interior, in which the conversion from the liquid into the gaseous state takes place. The vaporiser body is heated up by electric resistances or, for example in a vehicle drive, by hot liquids. The temperature is controlled by a thermostat. For immediately stopping the operation in the case of faults, a thermal safety device is provided. In the gas line, a special thermal valve is installed which, in the cold state of the vaporiser, is held by the gas pressure and a spring in the closed state. A valve tappet, which is held on the opposite side of the housing in a sealing element and consists of a material having a coefficient of thermal expansion which is lower than that of the material of the vaporiser housing, is connected via an angle lever to the sealing body of the valve. When the body of the vaporiser expands due to heating, the tappet is subjected to tensile stress and rotates the angle lever, whereby the sealing body is shifted and the valve is opened. The outer holding of the valve tappet in the sealing element is effected via an adjustable nut, by means of which a calibration or zero setting of the vaporiser in the cold state is possible. In the case of take-off above the capacity of the vaporiser or of power failure, the vaporiser body cools and consequently shortens. Since the shortening is greater than that of the valve tappet, the passage cross-section of the valve is reduced until it is completely closed.
Patent WO-8202817-A1 (WO)
Title: Trawl fishing device and driving pulley and mechanism relating thereto
Inventor: DE LA ROCHE KERANDRAON OLIVIER
IPC: A01K79/00
Filed: 1982-02-25
Abstract: The trawl comprises a main line (3) closed as a loop, to which are fixed hook carrier lines (4). The device further comprises means carried by a boat (2) to provide for the unwounding of the trawl line. The device further comprises an underwater device intended to be pulled by the boat (2) by means of the trawl line. This device comprises a deflector to slow down its progression into the water, and a return pulley (9) for the trawl line. Utilization for intensive fishing at varying depths.
Patent FR-2498399-A1 (FR)
Title: Systeme et procede de commande de mouvement pour television
Inventor: MICHAEL PETER COLIN
IPC: H04N5/21
Filed: 1982-01-21
Abstract: COMMANDE DE MOUVEMENT POUR TELEVISION. L'INVENTION CONCERNE UN SYSTEME DE TRAITEMENT VIDEO DESTINE A REDUIRE LA TENEUR EN DONNEES NECESSAIRE LE LONG D'UN PARCOURS DE TRANSMISSION 15. UN PROCESSEUR DE MOUVEMENT 12 COMPRENANT UNE MEMOIRE D'IMAGE PEUT DETECTER A LA FOIS LES MOUVEMENTS INTER-TRAMESET INTER-IMAGES ET UTILISER CE RESULTAT POUR MANIPULER LA DONNEE DE MANIERE A INHIBER OU ATTENUER SON CONTENU DE MOUVEMENT, DE FACON A NE PAS DEPASSER LA BANDE PASSANTE DISPONIBLE. CETTE MANIPULATION PEUT EGALEMENT ETRE UTILISEE POUR OBTENIR UNE PERSISTANCE RESIDUELLE DU MOUVEMENT ENTRE IMAGES ET POUR REDUIRE LA TENEUR EN BRUIT DE L'IMAGE. UN PROCESSEUR 17 A L'EXTREMITE ELOIGNEE DU PARCOURS DE TRANSMISSION PEUT RECONSTITUER LA DONNEE ET LA RENDRE DISPONIBLE AUX VITESSES VIDEO NORMALES.
Patent FR-2522754-A1 (FR)
Title: Speed changer for conveyor chain - has drive ratchet controlled by fixed and spring loaded cams
Inventor: GAUDIN FRANCOIS
IPC: A01F25/20
Filed: 1982-03-05
Abstract: The speed changer is mounted on an extension (21) of the drive shaft (22) and has a semi-circular fixed cam (34) and a semi-circular pivoting cam (36) which is spring loaded to remain in the closed position. The driving pinion (12) carries a ratchet pawl (24) with two faces. The pawl engages with a mating toothed gear (20) on the drive shaft (22). During its travel around the fixed cam the pinion (12) drives the shaft (22). When the roller (32) of the pawl engages with the mobile cam (36) it will drive the chain shaft only if the load is light. As the load on the chain increases the stiffness of the spring (44) is overcome and the cam (36) pivots to allow the ratchet to slip, until the next revolution.
Patent FR-2503381-A1 (FR)
Title: Detecteur de rayonnement
Inventor: HANAWA MASATOSHI
IPC: G01T1/18
Filed: 1982-03-31
Abstract: L'INVENTION CONCERNE UN DETECTEUR DE RAYONNEMENT COMPORTANT A CHACUNE DE SES EXTREMITES UN DISPOSITIF DE DETECTION DE POSITION DE SOURCE. CHAQUE DISPOSITIF DE DETECTION COMPORTE DE TROIS A CINQ PLAQUES ELECTRODES DONT UNE PLAQUE DE POLARISATION DISPOSEE AU CENTRE QUI PORTE DES COUCHES DE REVETEMENT SUR SES DEUX SURFACES ET DES PLAQUES ELECTRODES DE SIGNAUX DE CHAQUE COTE DE L'ELECTRODE DE POLARISATION, NE PORTANT UNE COUCHE DE REVETEMENT QUE SUR UNE SURFACE, LE POUVOIR D'EMISSION DES ELECTRONS SECONDAIRES DE LA MATIERE DE LA COUCHE DE REVETEMENT EST INFERIEUR A CELUI DE LA MATIERE DES PLAQUES ELECTRODES POUR LE RAYONNEMENT INCIDENT. L'INVENTION S'APPLIQUE A UN APPAREIL DE TOMOGRAPHIE CALCULEE.