Optical element, and method and apparatus for forming the same
AssigneeCanon Kabushiki Kaisha
InventorTakashi Arai
Life of this patent
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Abstract
In an optical element, and a method and apparatus for forming the same, peeling does not occur while a resin layer is cured, and the completed optical element can be easily released after the resin layer has been completely cured. The optical-element forming apparatus includes a forming surface for transferring a predetermined surface shape onto a surface of the resin layer, and includes a mold member having a high molecular weight material satisfying physical values of a hardness: >D50 and/or >R70, a modulus of elasticity: 5000-35000 kgf/cm.sup.2, a coefficient of friction: <0.2, a coefficient of water absorption: <0.3%, and a light resistance: invariable or slightly variable.
Claims9
An optical-element forming method for forming an optical element formed from a glass material and a resin material made as one body by forming a resin layer having a predetermined surface shape of said optical element on a surface of a glass member by one sequence forming-processing, said method comprising the steps of:
- providing a mold member for transferring said predetermined surface shape of said optical element onto said resin layer;
- transferring said predetermined surface shape of said optical element onto said resin layer by employing said mold member comprising a high molecular weight material having the physical values of:
- a hardness greater than D50;
- a modulus of elasticity in the range of 5000-35000 kgf/cm.sup.2 ;
- a coefficient of friction which is less than 0.2;
- a coefficient of water absorption which is less than 0.3%;
- and
- a light resistance which is substantially invariable.
An optical-element forming method for forming an optical element providing a resin layer having a final desired predetermined surface shape of said optical element obtained by combining a plurality of resin layers each having a resin layer thickness, and including a first resin layer, said resin layers being made integral with a glass member by sequentially laminating the plurality of said resin layers, each of said resin layers having a predetermined surface shape of said optical element on a surface of the glass member, by a plurality of sequences of forming-processing, said method comprising the steps of:
- providing a mold member for transferring said predetermined surface shape of said optical element onto said resin layer in at least one of said plurality of sequences of forming-processing;
- transferring said predetermined surface shape of said optical element onto said resin layer by employing said mold member comprising a high molecular weight material having the physical values of:
- a hardness greater than D50;
- a modulus of elasticity of elasticity in the range of 5000-35000 kgf/cm.sup.2 ;
- a coefficient of friction which is less than 0.2;
- a coefficient of water absorption which is less than 0.3%;
- and
- a light resistance which is substantially invariable.
Dependencies are inferred from the claim text.