Mold and mold manufacturing method
A technology for forming molds and molds, which is applied to household appliances, other household appliances, optical components, etc., can solve problems such as axis deviation, deviation, and inability to meet the required optical performance, and achieve the effect of suppressing deviation
Inactive Publication Date: 2012-09-12
KONICA MINOLTA OPTO
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- Abstract
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- Application Information
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Problems solved by technology
However, no matter how the facing opening is formed with good precision, there is a small gap between the opening and the core (for example, about 5 μm) necessary for inserting and removing the core, so there may be a corresponding gap between the opening and the core. axis deviation
Once the axis deviates, the optical surface of the optical element will have a core deviation, which may not meet the required optical performance
This is especially problematic when molding multiple optics at once
Method used
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Embodiment Construction
[0036] Embodiments of the present invention will be described below with reference to the drawings. figure 1 is the cross-sectional view of the molding die, figure 2 is a schematic diagram of the core and core support components, image 3 It is a three-dimensional schematic diagram of the processing state of the mold casing.
[0037] figure 1 Among them, the upper die (mold sleeve) 10 supported by the upper bracket 11 has a plurality of (3 columns and 3 rows in the figure) cylindrical openings 10a. The core support member 12 is fitted in the opening 10a. The upper mold 10 is 5.7×10 with a coefficient of thermal expansion -6 / K's WC is the material.
[0038] Such as figure 2 As shown, the hollow cylindrical core support member 12 has a shape in which a large-diameter part 12a and a small-diameter part (fitting part) 12b are connected in series, and has a through hole 12c in the axial direction. The material is STAVAX (pre-hardened mold steel) constitute. The coefficie...
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The material of core supporting members (12, 22) is selected such that the thermal expansion coefficient thereof is higher than that of mold sleeves (10, 20). Even when the diameter of openings (10a, 20a) of the mold sleeves (10, 20) is increased due to thermal expansion during transfer molding, the outside diameter of the core supporting members (12, 22) is further increased; gaps between the core supporting members (12, 22) and the openings (10a, 20a) are eliminated. As a result, the optical axes of transfer-molded surfaces formed on cores (13, 23) are accurately positioned with respect to the axes of the openings (10a, 20a), resulting in high-precision optical elements and the like.
Description
technical field [0001] The invention relates to a molding die and a manufacturing method of the molding die, in particular to a molding die suitable for molding optical elements and a manufacturing method of the molding die. Background technique [0002] Optical elements such as lenses are used in optical devices such as optical pickup devices. This type of optical element can be molded with a molding die made of plastic, glass, etc. In recent years, the demand for high-density recording / reproduction of information has increased in optical pickup devices, and optical elements with higher molding accuracy have been desired. [0003] Generally, an optical element molding mold such as an objective lens is formed by facing an aspherical upper mold and a lower mold, injecting molten resin or inserting a heated glass preform between them, and then pressurizing and cooling to obtain the desired shape. objective lens. In addition, in order to replace the transfer molding surface ...
Claims
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IPC IPC(8): B29C33/38B29C45/36
CPCB29C33/304B29C33/38B29C43/021B29C43/361B29C2043/3626B29D11/005B29L2011/00B29L2011/0016B29K2995/0012B29K2905/00B29K2909/04
Inventor 松田裕之
Owner KONICA MINOLTA OPTO