CN211741756U

CN211741756U - Bifocal composite progressive multi-focus spectacle lens

Info

Publication number: CN211741756U
Application number: CN202020194057.0U
Authority: CN
Inventors: 任建锋; 余浩墨; 冯涛; 姚飞
Original assignee: Suzhou Mingshi Optical Technology Co ltd; Jiangsu Mingshi Optical Technology Co ltd
Current assignee: Suzhou Mingshi Optical Technology Co ltd; Jiangsu Mingshi Optical Technology Co ltd
Priority date: 2020-02-21
Filing date: 2020-02-21
Publication date: 2020-10-23
Anticipated expiration: 2030-02-21

Abstract

The utility model discloses a compound multifocal lens that advances gradually of bifocal, including the lens, be equipped with two light crossover lines on the lens, two light crossover lines set up in the geometric center below of lens, and the lens divide into light zone and light zone down, and light zone is equipped with the arc-shaped sub-mirror down, goes up the light zone and still is equipped with optical center, lens assembly center and prism measuring point. The utility model has the advantages that: the lens is designed in an arc-shaped double-light mode, so that the mother lens and the boundary line become gentle, and a larger visual field in a near reading area is ensured; the optical center of the front surface sub-lens of the lens is close to a conventional reading area at a position ten millimeters below the geometric center, so that a vertical prism of the reading area is reduced, and a stable imaging effect is favorably generated; the back surface of the lens adopts a low-interference progressive design, the maximum astigmatism of the blind area does not exceed 95 percent of the addition value, and the progressive adaptation difficulty is further reduced.

Description

Bifocal composite progressive multi-focus spectacle lens

Technical Field

The utility model relates to a lens technical field specifically is a compound multifocal lens that advances of bifocal.

Background

For myopic people, although blind zone control around the periphery of a progressive addition lens has been greatly improved in recent years from improvements in surface machining and design techniques, progressive addition lens wearers with large ADD, for example, in excess of 2.50D, are still disturbed to a different extent by two situations: one is that blind area astigmatism causes the adaptation difficulty greatly, and the other is that the reading area of near usefulness is narrow and small and luminosity is unstable and leads to near usefulness to read and has the discomfort. Usually, the optimal design can eliminate or greatly improve one of the interferences, but it is difficult to greatly improve both interferences.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a compound multifocal lens that advances gradually of bifocal to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the bifocal composite progressive multi-focal spectacle lens comprises a lens, wherein a bifocal transition line is arranged on the lens and arranged below the geometric center of the lens, the lens is divided into an upper light area and a lower light area, an arc-shaped sub-lens is arranged in the lower light area, and an optical center, a lens assembly center and a prism measuring point are further arranged in the upper light area.

Preferably, the semicircular vertex of the arc-shaped sub-mirror is arranged four millimeters below the geometric center of the lens.

Preferably, the light adding of the arc-shaped sub-mirror arranged in the lower light area of the lens is between 0.75D and 1.75D.

Preferably, the optical center of the front surface of the arc-shaped sub-mirror is positioned ten millimeters below the geometric center.

Preferably, the rear surface of the lens is of progressive addition design and the progressive addition design is in a blind zone within the range of the lens cutting edge.

Preferably, the optical center, the lens assembly center and the prism measurement point which are arranged in the upper light area are the same point with the geometric center.

Advantageous effects

The lens is designed in an arc-shaped double-light mode, so that the mother lens and the boundary line become gentle, and a larger visual field in a near reading area is ensured; the optical center of the front surface sub-lens of the lens is close to a conventional reading area at a position ten millimeters below the geometric center, so that a vertical prism of the reading area is reduced, and a stable imaging effect is favorably generated; the back surface of the lens adopts a low-interference progressive design, the maximum astigmatism of the blind area does not exceed 95 percent of the addition value, and the progressive adaptation difficulty is further reduced.

Drawings

FIG. 1 is a schematic diagram showing the structure comparison between the prior art dual lights and the dual lights of the present invention;

fig. 2 is a schematic plan view of the present invention.

Reference numerals

1-lens, 2-double transition line, 3-geometric center, 4-arc-shaped sub-mirror, 5-traditional double light, 6-single light, 7-upper light area and 8-lower light area.

Detailed Description

The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

Examples

As shown in fig. 1-2, a bifocal compound progressive multifocal spectacle lens includes a lens 1, a bifocal transition line 2 is disposed on the lens 1, the bifocal transition line 2 is disposed below a geometric center 3 of the lens 1, the lens 1 is divided into an upper light area 7 and a lower light area 8, the lower light area 8 is provided with an arc-shaped sub-lens 4, and the upper light area 7 is further provided with an optical center, a lens assembly center and a prism measurement point.

Preferably, the semicircular vertex of the arc-shaped sub-mirror 4 is arranged four millimeters below the geometric center 3 of the lens 1.

Preferably, the light adding of the arc-shaped sub-mirror 4 arranged in the lower light area 8 of the lens 1 is between 0.75D and 1.75D.

Preferably, the optical center of the front surface of the arc-shaped sub-mirror 4 is disposed ten millimeters below the geometric center 3.

Preferably, the rear surface of the lens 1 is of progressive addition design and the progressive addition design is in a blind zone within the cut edge of the lens 1.

Preferably, the optical center, the lens assembly center and the prism measurement point of the upper light area 7 are all the same point as the geometric center 3.

The back surface of the lens is superposed with the bifocal composite progressive multi-focal lens with low-interference progressive design, through the superposed ADD design of the front surface and the back surface, the discomfort of near reading caused by the difficulty in adaptation due to large peripheral interference generally existing in the large ADD progressive lens or the narrow near reading area and unstable luminosity is reduced, compared with the traditional bifocal lens, the novel bifocal composite progressive lens has relatively small image jump because the light adding of the bifocal sub-lens on the front surface does not exceed 1.75D;

for example, when a pair of far-2.00D and add250 wearer prescriptions are used, if a traditional progressive multi-focus lens is used, the peripheral blind zone astigmatism reaches 2.50D, and the relatively stable range of the near zone in the transverse and longitudinal directions does not exceed 2 mm and half caliber; after the bifocal compound progressive addition with the front surface light of 1.25D is used, the blind zone astigmatism is reduced to 1.15D, the transverse and longitudinal stable zones of the near reading zone exceed 5 mm and half aperture, and compared with double light, the image jump is reduced, and the steps of the primary mirror and the secondary mirror become unobvious.

The utility model has the advantages that the used mould is divided into an upper mould base and a lower mould base, the upper mould base is of an arc double-optical surface type with the light of 0.75D-1.75D, and the lower mould base is of a convex surface progressive multi-focus surface type; for the astigmatic lens, the upper die base is used for casting a semi-finished blank for producing the lens, and the free-form surface of the rear surface of the lens is turned and molded through software design to manufacture a finished lens.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the content of the present invention within the protection scope of the present invention.

Claims

1. A progressive multifocal ophthalmic lens of the bifocal compound type, comprising a lens (1), characterized in that: be equipped with two light transition lines (2) on lens (1), two light transition lines (2) set up in the geometric center (3) below of lens (1), lens (1) divide into light zone (7) and light zone (8) down, light zone (8) are equipped with arc sub-mirror (4) down, it still is equipped with optical center, lens assembly center and prism measuring point to go up light zone (7).

2. The progressive multifocal ophthalmic lens of the bifocal complex type according to claim 1, characterized in that: the semi-circle vertex of the arc-shaped sub-mirror (4) is arranged four millimeters below the geometric center (3) of the lens (1).

3. The progressive multifocal ophthalmic lens of the bifocal complex type according to claim 1, characterized in that: the light adding of the arc-shaped sub-mirror (4) arranged in the lower light area (8) of the lens (1) is between 0.75D and 1.75D.

4. The progressive multifocal ophthalmic lens of the bifocal complex type according to claim 1, characterized in that: the optical center of the front surface of the arc-shaped sub-mirror (4) is arranged at a position ten millimeters below the geometric center (3).

5. The progressive multifocal ophthalmic lens of the bifocal complex type according to claim 1, characterized in that: the rear surface of the lens (1) is of progressive addition design and the progressive addition design is in a blind zone within the range of the cutting edge of the lens (1).

6. The progressive multifocal ophthalmic lens of the bifocal complex type according to claim 1, characterized in that: the optical center, the lens assembly center and the prism measuring point which are arranged in the upper light area (7) are the same point with the geometric center (3).