JPS6243293Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a processing reference indicator for unshaped spectacle lenses that clarifies the position of the presbyopic lens part in a seamless bifocal lens and facilitates processing work during external shape processing. It is.

Currently, various types of bifocal eyeglass lenses are manufactured in which a lens part for presbyopia is integrally molded at an eccentric position of a single lens body, and among them, so-called seamless lenses have a blurred finish at the boundary between the lens part for presbyopia and the lens body. Bifocal lenses have a high product value and are in high demand because the boundaries are not visible and can be used in the same way as single-focal lenses.

However, in such a seamless bifocal lens, the boundary between the presbyopic lens part and the lens body cannot be seen, so when shaping the unshaped lens body according to the eyeglass frame, it is necessary to At present, it is not manufactured very much despite the large demand for it because accurate positioning is not possible and external machining is difficult.

In view of these drawbacks, the present invention provides a seamless bifocal lens in which a presbyopia lens part is integrally molded at an eccentric position of an unshaped lens body, and the boundary between the presbyopia lens part and the lens body is blurred. A transparent seal member having a reference point marked on the presbyopic lens portion and having an outer shape corresponding to the area of the presbyopic lens portion is pasted so that the reference point corresponds to the mark marked on the presbyopic lens portion. In an attempt to eliminate the above-mentioned drawbacks by providing a processing reference indicator for eyeglass lenses, one embodiment of the present invention will be described below based on the drawings. 1 is a lens body of an unshaped eyeglass lens; A presbyopia lens part 2 made of a convex lens is integrally molded in an appropriate circular area at an eccentric position of the lens body 1, and a boundary line 3 between the presbyopia lens part 2 and the lens body 1 is visible. A so-called seamless bifocal lens is constructed by applying a blurring process to prevent blurring.

4 is a sealing body made of a transparent film coated with an adhesive on one side, and has a circular outer shape of approximately the same size as the circular area of the presbyopic lens portion 2, and has a small hole 5 in the center. The small hole 5 is provided as a reference point 6, and a colored outline indicating line 7 is printed on the outer peripheral surface.

When attaching the sealing body 4 to the lens body 1, the central reference point of the presbyopic lens portion 2 is measured with a lens meter and a marked point 8 is marked, and the reference point of the sealing body 4 is set relative to the marked point 8. The sealing body 4 is pasted on the presbyopic lens part 2 so that the parts 6 and 6 are aligned with each other.

In short, the present invention provides a seamless bifocal lens in which a presbyopic lens part is integrally molded at an eccentric position of an unshaped lens body, and the boundary between the presbyopic lens part and the lens body is blurred. A transparent seal 4 having a dot 6 marked thereon and having an outer shape corresponding to the area of the presbyopia lens part 2 is pasted so that the reference point 6 corresponds to the mark 8 marked on the presbyopia lens part 2. Therefore, even in a seamless bifocal lens where the boundary part 3 of the lens part 2 for presbyopia cannot be visually recognized, the area of the lens part 2 for presbyopia in the lens body 1 can be clearly confirmed by the attached seal body 4. In addition, since the sealing body 4 is transparent, when suctioning a suction cup to be attached to a processing machine, the suction cup can be accurately suctioned to a predetermined position while looking through the suction cup. When processing the external shape of the main body 1, the lens main body 1 can be accurately fixed at a predetermined position in the processing machine based on the indication by the seal body 4, so that the processing work can be performed easily and accurately, and other practical effects. It's huge.

[Brief explanation of the drawing]

The figure shows one embodiment of the present invention.
FIG. 2 is a front view of the lens body, FIG. 2 is a front view of the seal body, and FIG. 3 is a front view of the lens body with the seal body attached. 1... Lens body, 2... Lens part for presbyopia, 3
... Boundary part, 4 ... Seal body, 6 ... Reference point, 8
...Mark.

Claims (1)

[Scope of utility model registration request] In a seamless bifocal lens in which a presbyopic lens part is integrally molded at an eccentric position of an unshaped lens body and the boundary between the presbyopic lens part and the lens body is blurred, a reference point is marked in the center and An unshaped spectacle lens characterized in that a transparent seal body having an outer shape corresponding to the area of the lens for presbyopia is pasted so that a reference point corresponds to a mark marked on the lens for presbyopia. Processing standard display.