DE818858C - Method for smoothing uneven surfaces of bodies of revolution, in particular optical lenses, made of transparent thermoplastics - Google Patents

Method for smoothing uneven surfaces of bodies of revolution, in particular optical lenses, made of transparent thermoplastics

Info

Publication number
DE818858C
DE818858C DEK378A DEK0000378A DE818858C DE 818858 C DE818858 C DE 818858C DE K378 A DEK378 A DE K378A DE K0000378 A DEK0000378 A DE K0000378A DE 818858 C DE818858 C DE 818858C
Authority
DE
Germany
Prior art keywords
revolution
bodies
optical lenses
uneven surfaces
transparent thermoplastics
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DEK378A
Other languages
German (de)
Inventor
Guenther Dr Jobst
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kopperschmidt & Co Carl W
Original Assignee
Kopperschmidt & Co Carl W
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kopperschmidt & Co Carl W filed Critical Kopperschmidt & Co Carl W
Priority to DEK378A priority Critical patent/DE818858C/en
Application granted granted Critical
Publication of DE818858C publication Critical patent/DE818858C/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00865—Applying coatings; tinting; colouring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ophthalmology & Optometry (AREA)
  • Moulding By Coating Moulds (AREA)

Description

Verfahren zum Glätten unebener Oberflächen von Rotationskörpern, insbesondere optischer Linsen, aus durchsichtigen thermoplastischen Kunststoffen Durchsichtige Kunststoffe werden häufig so angewendet, daß ihre rund abgedrehten Oberflächen durch nachträgliche Behandlung geglättet werden.Process for smoothing uneven surfaces of bodies of revolution, in particular optical lenses, made from transparent thermoplastics See-through Plastics are often used so that their rounded surfaces through subsequent treatment can be smoothed.

Diese ¼glättung erfolgt durch Schleifen und Polieren und erfordert einen erheblichen Arbeitsaufwand.This ¼ smoothing is done by grinding and polishing and requires a considerable amount of work.

Auch ist es bekannt, derartige Kunststoffe aus der flüssigen, polymeren Phase durch Erstarren, meist unter Druck zu Preßlingen für Linsen zu verarbeiten, die dann aber, sei es aus Gründen der Schrumpfung oder fehlerhafter Ol>erfläche, noch verbessert werden müssen, beispielsweise durch Schleifen oder aber auch durch einen Aufguß eines dünnen aus der flüssigen, aber polymeren Phase bestehenden Stoffes gleicher oder ähnlicher Zusammensetzung. Auch eine solche Arbeitsmethodik bei der Herstellung von Linsen ist mit erheblichen Nachteilen verbunden, weil der aufgegossene Film sich häufig nicht gleichmäßig verteilt.It is also known to produce such plastics from the liquid, polymeric Phase through solidification, usually processed under pressure to form pellets for lenses, which then, be it for reasons of shrinkage or a faulty oil surface, still need to be improved, for example by grinding or by an infusion of a thin substance consisting of the liquid but polymeric phase same or similar composition. Such a working method at the The manufacture of lenses is associated with considerable disadvantages because of the infused The film is often not evenly distributed.

Auch dünnere Häute bringen ihrerseits noch Sclhrumpffehler hervor, und dickere Häute sind ohne Einwirkung zusätzlicher Kräfte wegen der hohen Viskosität und der Adhäsion an die Unterlage schwer gleichmäßig herzustellen. Daher sieht die Erfindung die Einwirkung der beim Schleudern auftretenden erheblichen Trägheitskräfte zur gleichmäßigen Verteilung eines Films vor. Ein gemäß der Erfindung hergestellter Rotationskörper, bei dem es sich nicht notwendig, aber vorzugsweise um optische Linsen handelt, aber auch um in irgendwelchen Formen abgedrehte Rotationskörper, bedingt lediglich ein vorheriges Abdrehen des Körpers auf die nötige Rohform und unter Umständen ein kurzzeitiges Filzen, falls das Drehwerkzeug nicht fein genug arbeitet. Bei dem dann erfindungsgemäß folgenden meist nur kurzzeitigen Schleudervorgang, der gegebenenfalls unter Aufwendung von Temperaturen bis zu I00° vor sich geht, wird der zähflüssig aufgebrachte Film rasch getrocknet und erstarrt, (fa er durch den Schleudervorgang sehr dünn und gleichmäßig ausgezogen wurde. Unebenheiten, die von der Vorbehandlung (Drehen) herstammen, werden durch diesen Film ausgeglichen. Even thinner skins in turn produce shrinkage defects, and thicker skins are without the application of additional forces because of the high viscosity and the adhesion to the substrate is difficult to establish uniformly. Therefore sees the Invention the effect of the considerable inertial forces that occur during spinning for evenly distributing a film. A according to the invention Manufactured body of revolution, which is not necessary, but preferably It is about optical lenses, but also about rotating bodies twisted in any shape, only requires a previous twisting of the body to the necessary raw shape and possibly a brief felting, if the turning tool is not fine enough is working. In the then, according to the invention, usually only brief spinning process, which, if necessary, takes place with the application of temperatures of up to 100 °, the viscous film is quickly dried and solidified (fa it passes through the spinning process was pulled out very thinly and evenly. Bumps that originating from the pretreatment (turning) are compensated by this film.

Man kann die Stärke des Schleuderfilms weitgehendst durch die Drehzahl und die Viskosität des flüssigen Polymerisats beeinflussen.The strength of the centrifugal film can be largely determined by the speed and affect the viscosity of the liquid polymer.

Claims (1)

PATENTANSPRUCH: Verfahren zum Glätten unebener Oberflächen von Rotationskörpern, insbesondere optischer Linsen, aus durchsichtigen thermoplastischen Kunststoffen, die nach mechanisch roher Verformung einen Überzug aus einem flüssigen, polymeren Stoff ähnlicher Zusammensetzung erhalten, dadurch gekennzeichnet, daß der in flüssiger Phase aufgebrachte filmartige Überzug durch schnelle Rotation des Körpers um seine Achse verteilt wird und gegebenenfalls unter zusätzlicher Wärme schon während der Bearbeitung erstarrt. PATENT CLAIM: Process for smoothing uneven surfaces of bodies of revolution, especially optical lenses, made of transparent thermoplastics, which, after rough mechanical deformation, has a coating made of a liquid, polymeric material Obtained substance of similar composition, characterized in that the in liquid Phase applied film-like coating by rapid rotation of the body around its Axis is distributed and possibly with additional heat during the Processing freezes.
DEK378A 1949-11-01 1949-11-01 Method for smoothing uneven surfaces of bodies of revolution, in particular optical lenses, made of transparent thermoplastics Expired DE818858C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEK378A DE818858C (en) 1949-11-01 1949-11-01 Method for smoothing uneven surfaces of bodies of revolution, in particular optical lenses, made of transparent thermoplastics

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEK378A DE818858C (en) 1949-11-01 1949-11-01 Method for smoothing uneven surfaces of bodies of revolution, in particular optical lenses, made of transparent thermoplastics

Publications (1)

Publication Number Publication Date
DE818858C true DE818858C (en) 1951-10-29

Family

ID=7208438

Family Applications (1)

Application Number Title Priority Date Filing Date
DEK378A Expired DE818858C (en) 1949-11-01 1949-11-01 Method for smoothing uneven surfaces of bodies of revolution, in particular optical lenses, made of transparent thermoplastics

Country Status (1)

Country Link
DE (1) DE818858C (en)

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