Flat topped bifocals model core of polycarbonate (PC) lens used for eyes
An ophthalmic lens, flat-top technology, applied in applications, optical components, household appliances, etc., can solve the problems of easy occurrence of small burrs, affecting appearance and use, and short service life, so as to eliminate small burrs and improve service life. and optical stability, the effect of reducing production costs
Inactive Publication Date: 2011-09-21
上海嘉视光学科技有限公司
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Problems solved by technology
[0005] Existing dual-optical mold cores usually adopt insert design, such as figure 1 As shown, due to the uneven shrinkage of the insert 2' and its plastic part 1', a large internal stress will be caused, which will cause the plastic part to bend or break, resulting in a short service life, and because its main piece 1' and The sub-pieces 2' are separated, and there will inevitably be a gap 3' during assembly. When the lens is injected, small flashes are likely to appear around the sub-mirror during injection molding.
In addition, stripes generated by centrifugal force appear during color-changing spin coating, which affects appearance and use
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[0022] see figure 1 ,Such as figure 2 As shown, the mold core of the present invention is an integral mold core, and its base body is, i.e., the main piece, an arc surface 1, and a part of the arc surface 1 protrudes into an arc surface 2 with a larger radius and a smaller arc, i.e. a sub-sheet .
[0023] Such as image 3 As shown, it is the front view of the embodiment of the present invention, and the corresponding point of the spherical center of the mold core of the present invention projected on the front view is O 3 , the center of the projection surface 1' of the arc surface l is O 1 , the radius of projection surface 1' is 32.5-40mm, the optimum value is 36.5mm, and the center of circle of projection surface 2' of arc surface 2 is O 2 , the projection surface 2' radius is 61.06-365.52mm, O 1 o 2 The distance between them is 3-15mm, and the optimal value depends on the most common use position. Arc surface 2 is an incomplete arc surface, which is formed by cutti...
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Abstract
The invention relates to a flat topped bifocals model core of polycarbonate (PC) lens used for eyes, which comprises a main slice (1), a secondary slice (2). The main slice (1) and the secondary slice (2) possesses the cambered surfaces with different radians, the secondary slice (2) is a part of the cambered surface of the main slice (1), the main slice (1) and the secondary slice (2) are combined as an integral body. The secondary slice (2) is an incomplete arc. According to the invention, a main mirror and a secondary mirror are designed on one model core, a multiple focus lenses injection molding can be realized, life and optical stability can be raised, small flash at the secondary mirror interface of added degree part can be eliminated; the junctions are connected with the different arcs, the problem that the stripes are generated by centrifugal force during discoloration spin-coating can be solved.
Description
technical field [0001] The invention relates to a flat-top dual-light mold core, in particular to a flat-top double-light mold core for PC ophthalmic lenses. Background technique [0002] Bifocal lenses usually divide the lens into two viewing zones: the one that corrects distance vision is called the far zone and the far zone; the one that corrects near vision is called the near zone, near zone or reading zone. The additional focal power for near vision is equal to the difference between the focal power for near vision and distance vision, FA=FN-FD, so the prescription for near use is often expressed by the additional focal power for near vision, and an appropriate one is added to the prescription for distance use Positive spherical power (eg Add: FA). [0003] Bifocal lenses are often regarded as a close combination of two lenses, that is, the main lens is used for distance correction, and a sub-lens is attached to the main lens for near-sight correction. It can be known ...
Claims
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IPC IPC(8): B29C45/26B29L11/00
Inventor 黄伟文张勇李长江
Owner 上海嘉视光学科技有限公司