baber/WOPTO huggingface dataset:
Patent AT-E499660-T1 (AT)
Inventor: BROOKS JULIANA
IPC: G01R33/02
Filed: 1999-09-10
Granted: 2011-03-15
Abstract: A method and apparatus for biometric recognition (10) of an individual living organism using electric and/or magnetic or acoustic energy. A biometric recognition system for measuring at least one bio-electrical and/or biomagnetic property. A method and apparatus for recognition of an individual living organism's identity. A method and apparatus for identifying electric and/or magnetic properties of an individual living organism. A method and apparatus for diagnosing a bone. A method and apparatus for sensing an induced current (12) in an individual living organism. A method for using a computer (22). A method for secure communication between an individual at a first location and a second location. A method and apparatus for sensing the electric and/or magnetic properties of an individual living organism using acoustic energy.
Patent AT-E222406-T1 (AT)
Inventor: ZHANG JIUJUN
IPC: H01M4/86
Filed: 1999-10-14
Granted: 2002-08-15
Abstract: Liquid feed fuel cell performance can be increased by impregnating electrode substrates with a proton conducting ionomer prior to incorporation of the electrocatalyst, and optionally also after application of the electrocatalyst. Ionomer impregnation is particularly effective for direct methanol fuel cell anodes that comprise carbonaceous substrates.
Patent AT-E254213-T1 (AT)
Inventor: KAPADIA SURESH BABUBHAI
IPC: D21H17/35
Filed: 1999-09-27
Granted: 2003-11-15
Abstract: There is described a process for the manufacture or treatment of paper or a paper product. The method comprises applying to the paper product, either during manufacture or subsequently, a solution or dispersion of a rubber in an organic solvent or mixture of solvents, the solution or dispersion being at least substantially free of polymers containing perfluorinated alkyl groups. Synthetic rubbers such as neoprene are preferred. Papers prepared in accordance with the process are particularly suitable for use as security papers and banknotes.
Patent AT-E232711-T1 (AT)
Inventor: MAGNUSSON ING-BRITT
IPC: A61F13/53
Filed: 1999-10-01
Granted: 2003-03-15
Abstract: An absorbent product comprising a liquid-permeable casing layer (402), a liquid-barrier layer (413) and an absorption element (416) which is enclosed between the liquid-permeable casing layer (402) and the liquid-barrier layer (413), and a liquid-transfer layer (403) which is disposed between the liquid-permeable casing layer (402) and the absorption element (406). The envelope layer (402) is bonded in a pattern of distinct thermally produced bonds (405) to the liquid-transfer layer (403). The liquid-transfer layer (403) comprises 40-65% by weight network-creating function fibres which are substantially intact following the bonding-together of the envelope layer (402) and the liquid-transfer layer (403) and which have a fibre coarseness ranging from 6 denier to 12 denier and 35-60% by weight fibres comprising a weldable, thermoplastic component and having a fibre coarseness of at least 3 denier.
Patent AT-E261000-T1 (AT)
Inventor: POPELAR PATRIK
IPC: B22D1/00
Filed: 1999-12-16
Granted: 2004-03-15
Abstract: By studying heat transfer in a sample vessel containing a sample of molten cast iron, it is possible to carry out accurate predictions of the microstructure in which the molten cast iron sample will solidify. This method is also highly suitable for automatisation by using a computer.
Patent DE-211894-T1 (DE)
IPC: C12N15/16
Filed: 1986-01-30
Abstract: Biologically active heterodimeric human FSH and other hormones similarly composed of alpha and beta subunits are synthesised in cells transfected with one or more expression vectors comprising heterologous DNA encoding each of the subunits.
Patent DE-666368-T1 (DE)
Inventor: BOTTORFF KYLE J
IPC: D21H21/16
Filed: 1995-02-03
Abstract: A process of using paper in high speed converting or reprographic operations, the paper made under alkaline conditions and sized with a 2-oxetanone sizing agent that is not solid at 35 DEG C. Fine paper that is sized with a 2-oxetanone alkaline sizing agent and that does not encounter machine feed problems in high speed converting or reprographic machines, including continuous forms bond paper and adding machine paper, envelope paper, continuous forms bond paper and adding machine paper, and paper products of the processes, as well as certain novel sizing agents.
Patent DE-792845-T1 (DE)
Inventor: JENSEN SOREN LUND
IPC: D03D13/00
Filed: 1995-11-08
Abstract: Man-made vitreous fibres have a solubility at pH 4.5 of at least 20nm per day and a melt viscosity of 10-70 poise at 1,400°C. A composition which will provide these properties is selected for their manufacture and contains at least 105 by weight Al<sub>2</sub>O<sub>3</sub>. Novel fibres contain at least 6% by weight Na<sub>2</sub>O + K<sub>2</sub>O.
Patent ES-2936296-T1 (ES)
Title: Extracto concentrado de algas, método de producción y uso del mismo en la agricultura
Inventor: HERY PAUL
IPC: A01P21/00
Filed: 2015-09-11
Abstract: La presente invención se refiere a un extracto concentrado de algas, con un contenido entre el 6 y el 100% de materia seca, a su método de producción, y a los usos del mismo, ya sea solo o asociado a otra tecnología nutricional, bioestimulante o fitosanitaria, en particular para estimular la emergencia, crecimiento, desarrollo y reproducción de plantas y para evitar que las aves coman semillas. La invención también se refiere a un método para aplicar el extracto concentrado de algas de la invención, así como a una semilla recubierta con dicho extracto.  (Traducción automática con Google Translate, sin valor legal)
Patent ES-2117612-T1 (ES)
Title: Cerradura de cinturon para un cinturon de seguridad.
Inventor: WIER FRANZ
IPC: A44B11/25
Filed: 1997-10-21
Abstract: CIERRE DE CINTURON PARA UN CINTURON DE SEGURIDAD CON MARCO (3, 3'') PORTADOR DE LA CARGA, QUE CONSTA DE UNA PARTE SUPERIOR (21) Y UNA PARTE INFERIOR ESENCIALMENTE PARALELA A ESTA, ENTRE LAS QUE PUEDE ACOGERSE LA LENGUA DE INSERCION DE UNA GUARNICION Y QUE ESTAN FORMADAS MEDIANTE EL ARQUEO DE UN COMPONENTE ALARGADO EN FORMA DE PLACA, EN PARTICULAR UNA PIEZA ESTAMPADA (1; 1''), CARACTERIZADO PORQUE LA PARTE SUPERIOR Y LA PARTE INFERIOR (21, 23) ESTAN UNIDAS ENTRE SI EN ARRASTRE DE FORMA EN EL AREA DE SU EXTREMO LIBRE, EN TANTO QUE EN CADA UNO DE LOS DOS BORDES LATERALES (27, 29) AL MENOS UNA SECCION DE LA PARTE SUPERIOR O DE LA PARTE INFERIOR (21, 23) ESTA ARQUEADA ALREDEDOR DE UNA SECCION DE LA OTRA PARTE (21, 23) QUE LIMITA CON ELLA.
Patent CY-1107995-T1 (CY)
Inventor: DUMAS JACQUES
IPC: C07D405/04
Filed: 2007-01-16
Abstract: This invention relates to the use of a group of aryl ureas in treating cytokine mediated diseases other than cancer and proteolytic enzyme mediated diseases other than cancer, and pharmaceutical compositions for use in such therapy.
Patent CY-1108715-T1 (CY)
Title: Νεες πυριδοπυραζινες και η χρηση τους ως διαμορφωτες kinασων
Inventor: Günther Eckhard
IPC: A61P9/10
Filed: 2009-01-21
Abstract: Η εφεύρεση αναφέρεται σε νέα παράγωγα πυριδο[2,3-b]πυραζίνης του γενικού τύπου (I), στην παραγωγή και στη χρήση αυτών ως φαρμακευτικά μέσα, ιδίως για την αγωγή κακοηθών παθήσεων και άλλων παθήσεων βασιζόμενων σε παθολογικό πολλαπλασιασμό κυττάρων.
Patent CY-1111695-T1 (CY)
Title: Σχεδιασμος ανεξαρτητων μοναδων για οφθαλμικη χειρουργικη κεφαλη
Inventor: VALENCIA SALOMON
IPC: A61F9/00
Filed: 2011-05-04
Abstract: Οφθαλμική χειρουργική κεφαλή που διαθέτει συγκρότημα πρόσδοσης κίνησης τύπου ανεξάρτητων μονάδων και κάλυμμα αφαιρούμενο από το συγκρότημα πρόσδοσης κίνησης. Ο σχεδιασμός αυτός απλοποιεί την κατασκευή της κεφαλής και προσφέρει μεγαλύτερη κατασκευαστική ευελιξία.
Patent CY-1112535-T1 (CY)
Inventor: ROBB JOHN
IPC: C09D7/61
Filed: 2012-02-16
Abstract: A colored composition comprising: a) NIR scattering TiO2 particulate material with an average crystal size of greater than 0.40 μm and a particle size distribution such that 30% or more of the particles are less than 1 μm; b) one or more non-white colorant; wherein the particulate material and the non-white colorant are dispersed within a vehicle. This material with a large crystal size has unusually high reflection of NIR radiation and, simultaneously, noticeably diminished reflectance of visible light. Also disclosed is a coated particulate TiO2 material, wherein the material has an average crystal size of greater than 0.40 μm, and the coating comprises one or more oxide material; this provides low levels of photocatalytic activity that were previously unattainable. This coated TiO2 material may be provided in a composition.
Patent CY-1114881-T1 (CY)
Title: 4r, 5s-εναντιομερες του 2-(5-μεθυλ-2-οξο-4-φαινυλ-πυρρολιδιν-1-υλ)-ακεταμιδιου με νοοτροπο δραστικοτητα
Inventor: KALVINS IVARS
IPC: A61P25/00
Filed: 2013-11-27
Abstract: Η εφεύρεση αφορά το 5S,4R-εναντιομερές του 2-(5-μεθυλ-2-οξο-4-φαινυλ- πυρρολιδιν-1-υλ)-ακεταμιδίου με δραστικότητα ενίσχυσης της γνώσης που έχει υψηλή φαρμακολογική αξία και τη μέθοδο παρασκευής του η οποία περιλαμβάνει τη σύνθεση 5S-μεθυλ-4R-φαινυλπυρρολιδιν-2-όνης, τη Ν-αλκυλίωσή της με αιθυλ αλογονοοξικό και την επεξεργασία του ενδιαμέσου αιθυλ 2-(5S-μεθυλ-2-οξο-4R-φαινυλ-πυρρολιδιν-1-υλ)-οξικού με αμμωνία.
Patent CY-1116047-T1 (CY)
Title: Μικροπορωδες πολυμερικο υλικο
Inventor: MCKEOWN NEIL B
IPC: B01D71/00
Filed: 2015-01-28
Abstract: Μικροπορώδες υλικό που περιλαμβάνει οργανικά μακρομόρια που αποτελούνται από πρώτο γενικά επίπεδο είδος συνδεδεμένο με άκαμπτους συνδέτες, με σημείο παραμόρφωσης έτσι ώστε δύο παρακείμενα πρώτα επίπεδα είδη συνδεδεμένα με το συνδέτη συγκρατούνται σε μη ομοεπίπεδο προσανατολισμό, με την προϋπόθεση ότι το πρώτο είδος είναι άλλο εκτός πορφυρινικών μακροκύκλων. Τα υλικά σύμφωνα με την εφεύρεση έχουν έκταση επιφανείας τουλάχιστον 300m2 g'1, π.χ. σε εύρος 700-1500 m 2 g'1. Προτιμώμενα σημεία παραμόρφωσης είναι σπειρο-ομάδες, τμήματα γεφυρωμένου δακτυλίου και μονοί ομοιοπολικοί δεσμοί με στερική συμφόρηση, γύρω από τους οποίους υπάρχει περιορισμένη περιστροφή.
Patent CY-1116340-T1 (CY)
Title: Παραγωγο χολεστανολης για συνδυασμενη χρηση
Inventor: YAZAWA SHIN
IPC: A61K31/337
Filed: 2015-04-23
Abstract: Αποκαλύπτεται ένας παράγων για χημειοθεραπεία του καρκίνου ο οποίος έχει μειωμένες ανεπιθύμητες παρενέργειες και εξαιρετική αποτελεσματικότητα. Ο παράγων για χημειοθεραπεία του καρκίνου περιλαμβάνει ένα συνδυασμό ενός παραγώγου χολεστανόλης που αναπαρίσταται από τον τύπο (1): (όπου το G αναπαριστά GlcNAc-Gal-, GlcNAc-Gal-GIc-, Fuc-Gal-, Gal-GIc- Gal- ή GlcNAc-) ή μίας ενώσεως εγκλεισμού κυκλοδεξτρίνης αυτού και ενός αντικαρκινικού παράγοντα.
Patent CY-1117905-T1 (CY)
Title: Αναστολεις πρωτεϊνικης κινασης
Inventor: LINNANEN TERO
IPC: C07D401/14
Filed: 2016-08-01
Abstract: Αποκαλύπτονται μία ένωση του τύπου (I), όπου τα R3, R4, G, Β, Μ και Ζ είναι όπως ορίζονται εις τις αξιώσεις, και φαρμακευτικά αποδεκτά άλατα αυτής. Οι ενώσεις του τύπου (I) χρησιμεύουν ως αναστολείς του FGFR και είναι χρήσιμες εις την αγωγή μίας κατάστασης, εις την οποία είναι επιθυμητή η αναστολή της FGFR κινάσης, όπως ένας καρκίνος.
Patent CY-1120262-T1 (CY)
Title: Αρθρωτο συστημα υποστηριξης πλατφορμας εργασιας, συστημα πλατφορμας εργασιας και μεθοδοι χρησης τους
Inventor: TIFFT EDWARD
IPC: E04G7/02
Filed: 2016-12-20
Abstract: Η εφεύρεση περιλαμβάνει πλατφόρμα εργασίας και σύστημα υποστήριξης που περιλαμβάνει διαμόρφωση κόμβων και δοκών, όπου οι κόμβοι και οι δοκοί έχουν δυνατότητα άρθρωσης, ή περιστροφής. Μια μέθοδος εγκατάστασης επιτρέπει σε τμήματα ενός κανούργιου συστήματος πλατφόρμας εργασίας να επεκταθούν από ένα υπάρχον αναρτημένο σύστημα πλατφόρμας εργασίας. Το σύστημα έχει επίσης την ικανότητα στήριξης, χωρίς αστοχία, του δικού του βάρους και τουλάχιστον τέσσερις φορές το προβλεπόμενο ωφέλιμο φορτίο που εφαρμόζεται σε αυτό.
Patent CY-1123505-T1 (CY)
Title: Καινοτομα πεπτιδια και συνδυασμος πεπτιδιων για χρηση στην ανοσοθεραπεια εναντι του επιθηλιακου καρκινου των ωοθηκων και αλλων καρκινων
Inventor: SCHUSTER HEIKO
IPC: C07K14/47
Filed: 2020-09-08
Abstract: Η παρούσα εφεύρεση σχετίζεται με ένα πεπτίδιο, πρωτεΐνες, νουκλεϊκά οξέα και κύτταρα για χρήση σε ανοσοθεραπευτικές μεθόδους. Συγκεκριμένα, η παρούσα εφεύρεση σχετίζεται με την ανοσοθεραπεία του καρκίνου. Η παρούσα εφεύρεση σχετίζεται επιπλέον με όγκο-σχετιζόμενους πεπτιδικούς επιτόπους Τ-κυττάρων, μεμονωμένους ή σε συνδυασμό με άλλα ογκο-σχετιζόμενα πεπτίδια, τα οποία μπορούν, για παράδειγμα, να λειτουργούν ως ενεργά φαρμακευτικά συστατικά συνθέσεων εμβολίων που διεγείρουν αντικαρκινικές ανοσοαπαντήσεις ή για τη διέγερση Τ-κυττάρων ex vivo και τη μεταφορά τους σε ασθενείς. Πεπτίδια προσδεδεμένα σε μόρια του μείζονος συμπλέγματος ιστοσυμβατότητας (major histocompatibility complex, MHC) ή παρόμοια πεπτίδια, μπορούν επίσης να αποτελέσουν στόχους αντισωμάτων, διαλυτών υποδοχέων Τ-κυττάρων και άλλων μορίων πρόσδεσης.
Patent CY-1124171-T1 (CY)
Title: Μη ανθρωπινα ζωα με εξανθρωπισμενο γονιδιο ενεργοποιησης λεμφοκυτταρων 3
Inventor: MURPHY ANDREW J
IPC: A01K67/027
Filed: 2021-05-21
Abstract: Παρέχονται μη ανθρώπινα ζώα, μέθοδοι και συνθέσεις για τη δημιουργία και χρήση αυτών, όπου τα εν λόγω μη ανθρώπινα ζώα περιλαμβάνουν τον εξανθρωπισμό ενός γονιδίου ενεργοποίησης λεμφοκυττάρων 3 (Lag3). Τα εν λόγω μη ανθρώπινα ζώα περιγράφονται σε μερικές υλοποιήσεις ως φέροντα μια γενετική τροποποίηση σε έναν ενδογενή γονιδιακό τόπο του Lag3, έτσι ώστε τα εν λόγω μη ανθρώπινα ζώα να εκφράζουν ένα πολυπεπτίδιο Lag3 που περιλαμβάνει ένα ανθρώπινο τμήμα και ένα ενδογενές τμήμα (π.χ., ένα μη ανθρώπινο τμήμα).
Patent HR-P20090574-T1 (HR)
Title: Method and device for repairing damaged pallets
Inventor: HOLLIGER ROBERT
IPC: B23P19/04
Filed: 2009-10-29
Abstract: The device has pallets with several floor boards which are connected with transverse boards using respective connecting pads. A fixed transverse stopper (17) and a movable transverse stopper (38) are provided for each floor board and the connection pad. The movable transverse stopper is designed to activate the respective floorboard and the pad against the associated fixed transverse stopper such that the respective floorboard and/or the pad is positioned and fixed transverse to the longitudinal axis of the pallet.
Patent HR-P20100173-T1 (HR)
Title: Transfer chain for preforms with handle
Inventor: RIDOSZ LIONEL
IPC: B29B11/14
Filed: 2010-03-24
Abstract: The chain has an orientation unit for orienting a mobile gripping and guiding element (2) of a perform (1) near an outlet of a terminal station such that a protector (2a) of the element covers an integrated handle (1b) of the perform in movement of the protector. The orientation unit drives the element in a position until a heating station that is provided with a guiding and orienting unit. The guiding and orienting unit angularly orients the element in a desired position before releasing the preform in a receiving station (III) of the preform in an oriented manner.
Patent HR-P20120011-T1 (HR)
Title: Process for manufacturing polyolefin films
Inventor: PETERS MARTINUS WILHELMUS MARIA GEMMA
IPC: B29C43/22
Filed: 2012-01-04
Abstract: A process for manufacturing a film of ultra-high molecular weight polyolefin includes (a) feeding an ultra-high molecular weight polyethylene with a weight average molecular weight of at least 500,000 gram/mole as a powder having a bulk density below 0.5 g/cm3 to a compaction zone of an isobaric double belt press; (b) subjecting the ultra-high molecular weight polyethylene powder in the compaction zone to an isobaric pressure to form a single layer sheet of compacted polyethylene at a temperature that is below the melting point of the polyethylene under process conditions and that is maintained within a temperature window of 2° C.; and (c) subjecting the sheet of compacted polyethylene to a rolling step and at least one stretching step at a temperature below the melting point of the polyethylene under process conditions.
Patent HR-P20120119-T1 (HR)
Title: A package
Inventor: ABRAHAMSSON BERTIL
IPC: B65D43/02
Filed: 2012-02-03
Abstract: The packaging (1) comprises a container (2) and a lid (3) that can be sealed to the container (2). An edge (4) of the lid (3) is provided with a pull tab (5) facilitating the removal of the lid (3) from the container (2). The lid (3) and pull tab (5) are injection moulded integrally, and the pull tab (5) has the form of a flexible grid-like flap that is bendable to a substantially upright position.
Patent SI-1348419-T1 (SI)
Title: Use of a pomegranate tree extract for hair colour retention
Inventor: FABRE BERNARD
IPC: A61Q5/10
Filed: 2003-03-26
Abstract: Pomegranate extract is used to maintain hair color, i.e. prolong the color intensity of dyed hair
Patent SI-1686997-T1 (SI)
Title: Inhibitors of the mutant form of kit
Inventor: BUCHDUNGER ELISABETH
IPC: A61K31/00
Filed: 2004-11-17
Abstract: The present invention relates to the treatment of KIT dependent diseases that are characterized by a mutant form of KIT whereby the mutant KIT is identified and an appropriate inhibitor of the mutant KIT is administered.
Patent SI-1689425-T1 (SI)
Title: Pharmaceutical formulations for the sustained release of one or more active principles and therapeutic applications thereof
Inventor: POULIQUEN GAUTHIER
IPC: A61K38/00
Filed: 2004-11-19
Abstract: A liquid pharmaceutical formulation (I) for prolonged release of active agent(s) (A) comprises a low viscosity aqueous colloidal suspension of submicron particles of water-soluble, biodegradable polymers (II) carrying hydrophobic groups, non-covalently associated with (A), where on parenteral injection (I) forms a gelled depot for prolonging the duration of (A) release to more than 24 hours. A liquid pharmaceutical formulation (I) for prolonged release of active agent(s) (A) comprises a low viscosity aqueous colloidal suspension (with water as dispersion medium) based on submicron particles (SMP's) of water-soluble, biodegradable polymers (II) carrying hydrophobic groups (HG's), non-covalently associated with (A). On parenteral injection, (I) forms a gelled depot in vivo (at least partially due to physiological proteins), controlling and prolonging the duration of (A) release to more than 24 hours. (I) is liquid under the injection conditions; at physiological temperature and/or pH; and/or in presence of physiological electrolytes at physiological concentrations and/or surfactant(s). Independent claims are included for: (1) a variant of (I) as described above, where the duration of release of (A) is not restricted but the concentration of (II) is sufficiently high to form a gelled depot in vivo in presence of protein(s) after parenteral injection; (2) novel derived products (preferably in powder or gel form), consisting of SMP's formed by non-covalent association of (II) and (A) as above and obtained from (I); and (3) methods of preparation of (I).
Patent SI-1716145-T1 (SI)
Title: Dihydrotetrabenazines and pharmaceutical compositions containing them
Inventor: CLARKE IAN
IPC: A61K31/00
Filed: 2005-02-11
Abstract: The invention provides novel isomers of dihydrotetrabenazine, individual enantiomers and mixtures thereof wherein the dihydrotetrabenazine is a 3,11 b-cis-dihydrotetrabenazine. Also provided are methods for the preparation of the novel isomers, pharmaceutical compositions containing them and their use in treating hyperkinetic movement disorders such as Huntington's disease, hemiballismus, senile chorea, tic, tardive dyskinesia and Tourette's syndrome.
Patent SI-1926458-T1 (SI)
Title: Device, strap and garment for treating skin and subcutaneous tissue disorders and for repairing sports injury, and method for making same
Inventor: CHARDON-BRAS MARYVONNE
IPC: A61F13/00
Filed: 2006-09-22
Abstract: A device (1) includes a first web of soft material (5), a projecting structure integral with the web and including multiple discrete projecting elements. The projecting elements include pieces of foam (3) spaced apart form one another and integral with the first web (5). The pieces of foam are compressed between the first web (5) and a second web (7) of soft material, the two webs mutually adhering between the projecting elements. The device is useful for treating various types of edemas and excessive tissue infiltration, as well as for repairing sports injury.
Patent SI-2142570-T1 (SI)
Title: Anti-epcam antibody and uses thereof
Inventor: ANASTASI ANNA MARIA
IPC: A61K39/395
Filed: 2008-04-02
Abstract: An anti-EpCAM antibody, designated ST3232/10, of marine origin exhibits properties suitable for both therapeutic and diagnostic applications. It shows high affinity for the native antigen and good tumor selectivity.
Patent SI-2101430-T1 (SI)
Title: Method and apparatus for transmitting control information in a wireless communication system
Inventor: MYUNG SEHO
IPC: H04L1/00
Filed: 2009-03-03
Abstract: A method for receiving control information through a preamble comprising Layer 1 (L1) part II signaling information in a communication system, the method comprising the steps of: 
acquiring information on a number of bits of Layer 1 (L1) part II signaling information from a received frame; 
calculating a number of LDPC blocks into which the L1 part II signaling information is divided; 
calculating a number of input information bits of each LDPC block when there are a plurality of LDPC blocks, such that the multiple LDPC blocks are equal in the number of input information bits, and calculating a number of puncturing bits among parity bits of each LDPC block; and 
decoding one or more received LDPC blocks based on the information acquired and calculated in the preceding steps.
Patent DE-3382774-T2 (DE)
Inventor: LOPEZ DE ROMANA EDUARDO AGUSTI
IPC: G11B7/08
Filed: 1983-08-04
Granted: 1995-04-27
Abstract: The present invention relates to a method and means for monitoring the focussing condition of the writing light beam impinging the writing surface of a recording medium. Systems for monitoring the focus condition of a light beam used in reproducing prerecorded information from a videodisc by a videodisc player operate by splitting off reflected light from the incident light beam path in a region where the incident beam is diverging. In this manner, the reflected beam entering the polarizing cube, placed in the diverging portion of the incident beam, produces a converging light beam diverted to the photodetector. Because of numerous problems in attempting to apply player concepts to writing machine, it has been common practice in the prior art of recording laser discs to periodically determine optimum focussing position for the various optical elements affecting focus by producing a series of test discs and playing back each disc or portion thereof corresponding to a particular combination of settings for the various optical parameters such as power and focus involved. The empirically derived conditions necessary to produce acceptable focussing conditions, however, are extremely costly due to the labor time involved in setting up and determining the optimum focus conditions as well as in the loss of videodisc production due to down time of the mastering machine. The present invention operates on the recognition of the fact that, although for all practical purposes a light beam from a laser device is collimated, it, in fact, is very slightly divergent as it emerges from the laser resulting from diffraction of the Gaussian intensity profile plane wave that exists between the laser resonator mirrors at the beam waist and from refraction as the output light traverses the thickness of the output mirror. Accordingly, since the beam exiting the laser tube is slightly divergent, the reflected light from the videodisc, even though a small in intensity, is conversely (provided the system is in focus) convergent as it passes in reverse direction through the diverging lens and on toward the output of the laser device and beyond to the conjugate point where it forms a real image of the source plane wave, thus eliminating the need for a relay lens. The present invention makes use of this slight divergence and convergence of the incident and reflected beams, respectively, at the exit end of the modulator to effect monitoring of the focus condition of the writing beam.