摘要:
Optical material, which was already roughly molded, is deposited into a space defined by a top mold, a bottom mold and a drum mold, and is then heated, pressed and molded, thus providing an optical element. By controlling the rate of plastic deformation of the optical material so as to prevent the material from entering clearance sections between the outside diameter of the top mold or of the bottom mold and the inside diameter of the drum mold, an optical element of high precision with no burr nor strain is provided at low cost.
摘要:
A method for making optical preforms of optical elements without residual stress or distortion is provided. In this method, an optical material is supplied between upper and lower molds. The upper mold has a plurality of recesses arranged in a predetermined pitch, and each recess corresponds to a first surface shape of the optical element. The lower mold has a plurality of recesses facing the recesses of the upper mold and each recess of the lower mold corresponds to a second surface shape of the optical element. The supplied optical material is pressed between the upper and lower molds to be a set of optical preforms. The set of optical preforms is processed by die punching or tool cutting to separate each optical preform from the set of optical preforms. Each optical preform is used for producing an optical element by further pressing. Alternatively, optical element can be formed directly by the press molding process.
摘要:
A die for press-molding an optical element with high precision comprises a base material made of a material excellent in heat resistance, heat shock resistance and mechanical strength at high temperature, an intermediate layer formed on the base material and made of a thin film excellent in grinding machinability and cutting machinability, and a surface protective layer formed on the intermediate layer and made of a metal thin film excellent in heat resistance and mechanical strength at high temperature and less reactive to a material of the optical element. Additional thin film may be inserted between the base material and the intermediate layer so as to enhance the adhesion strength between the base material and the intermediate layer. In place of the additional thin film to be inserted, a peripheral flange part of the intermediate layer is removed and thus on the removed peripheral part, the surface protective layer is directly adhered to the base material.
摘要:
A method for manufacturing preforms used in molding optical elements includes: (1) forming an array made from a material for optical elements, in which a plurality of preform portions used in molding optical elements are connected; (2) applying vibration to the outer peripheral part of the preform portion in the thickness direction of the array by a pair of punches; and then (3) punching the preform portions.
摘要:
A method for manufacturing an optical element comprises a step of press molding an optical element material 6 disposed between an upper press head (7) and its paired lower press head (8), wherein in the upper press head (7) and/or the lower press head (8) is formed a groove-like component that forms a non-cylindrical face or a cylindrical face as an optically effective component in the optical element material (6). This makes it possible to obtain an optical element with stable face shape precision, boosts productivity, and is also advantageous in terms of cost.
摘要:
A method of manufacturing optical elements which is capable of obtaining optical elements at high accuracy by molding through employment of an optical element molding glass material preliminarily processed to prevent such defects as crack formation or chipping at the corner portions of the molding material which contact dies when the material is charged into the mold. An optical element molding glass material to be employed for the above method is formed with curvatures at boundary portions i.e. corner portions where its cylindrical portion contacts at right angles with its end flat portions by applying chemical etching, heat of a carbon dioxide gas laser or radiation heat to such corner portions. Meanwhile, in the manufacturing process of the optical element in which upper and lower dies and the preliminarily processed molding material are subjected to molding through heating and pressurization in a contacted state at all times, the molding pressure is arranged to be reduced at least one or reduced to zero to provide the optical element at high accuracy.
摘要:
A lens molding method where a lens material is set between an upper mold and a lower mold, and the molding pressure is reduced or made zero at least once during a heating & pressing step without the mold surfaces breaking contact with the lens materials, and during a cooling & pressing step.
摘要:
The present invention relates to a composite lens and a method for manufacturing the same, particularly to a composite lens in which a second lens component is coupled to a first lens component at part of a first surface, and intends to improve optical characteristics. A composite lens (1) has a first lens component (10) and a second lens component (20). The first lens component (10) has a first surface including a first lens surface (13), a peripheral surface (15a) surrounding the first lens surface (13) and a ring surface (17a) included in the peripheral surface (15a) and surrounding the first lens surface (13), and a second lens surface (12) on the opposite side of the first lens surface (13). The second lens component (20) is coupled to the first lens component (10) at part of the first surface surrounded by the ring surface (17a). The ring surface (17a) is positioned on a portion of the first lens component protruding from a joint portion (14) between the first lens surface (13) and the peripheral surface (15a) in a first direction from the second lens surface (20) to the first lens surface (10) along an optical axis of the first lens component (10) and is exposed out of the second lens component (20).
摘要:
The present invention relates to composite optical elements, and particularly to a composite optical element in which second and third optical components are coupled to a first optical component. The present invention is advantageous in enhancing optical properties. A composite optical element (1) includes first, second and third optical components (10, 20, 30). The first optical component (10) has a lens surface (13). The second optical component (20) is coupled to the first optical component (10) at the lens surface (13) and has a lens surface (22) at a side opposite to a first coupling surface (21) at which the second optical component (20) is coupled to the first optical component (10). The third optical component (30) is coupled to the second optical component (20) at the lens surface (22) and has a lens surface (32) at a side opposite to a second coupling surface (31) at which the third optical component (30) is coupled to the second optical component (20). The lens surface (13) partially has a first uneven region (13a). The lens surface (22) partially has a third uneven region (22a). The lens surface (32) partially has a third uneven region (32a).
摘要:
The present invention belongs to a technical field related to a composite optical element including a first optical component and a second optical component coupled to the first optical component. In a composite optical element 1 including a first optical component 10 and a second optical component 20 coupled to the first optical component 10, shape accuracy of the second optical component 20 is improved to prevent reduction in optical performance. A ring member (106) is placed on a peripheral portion of a lens surface (10b) of the first optical component (10), the ring member (106) having a height hi from the lens surface (10b) substantially uniform in a circumferential direction of the first optical component (10).