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    OPHTHALMIC LENS WITH LARGE DIAMETER HAVING
    23.
    发明专利
    OPHTHALMIC LENS WITH LARGE DIAMETER HAVING 失效

    公开(公告)号：JPH02157811A

    公开(公告)日：1990-06-18

    申请号：JP27360389

    申请日：1989-10-20

    Applicant: ESSILOR INT

    Inventor： DANIERU KORUNU ,  KURISUCHIYAN ARUSHIINI ,  JIYAN TEIEEBOO

    IPC: G02C7/04 ,  G02C7/02

    Abstract: PURPOSE: To provide a relatively light-weight ophthalmologic lens with a large diameter having a positive refractive power by making the diameter of a central optical working area almost equal to the diameter of the geometrical outline of the lens, and having a special relation with the refractive power. CONSTITUTION: A diameter D1 of the central optical working area 10 of a lens is made almost equal to a diameter D2 of a geometrical outline 11. Then, a peripheral blending area 12 is provided between the optical working area and the geometrical outline 11 in the surrounding of the optical working area. In this case, a diameter D1 mm and a refractive power P diopter are related with each other in order to fulfill an expression D1 =a.b.P. Here, the values of a=84-89, and b=4-9 are used. Thus, the positive reflective power P=2-9 can be attained, and the relatively light opthalomological lens with a large diameter can be obtained.

    MONOFOCAL LENS FOR SPECTACLES IRRELEVANT TO GEOMETRICAL MAGNIFICATION WITH GRADIENT IN REFLACTIVE INDEX
    24.
    发明专利
    MONOFOCAL LENS FOR SPECTACLES IRRELEVANT TO GEOMETRICAL MAGNIFICATION WITH GRADIENT IN REFLACTIVE INDEX 失效

    公开(公告)号：JPH01316720A

    公开(公告)日：1989-12-21

    申请号：JP10570889

    申请日：1989-04-25

    Applicant: ESSILOR INT

    Inventor： EMANIYUERU BONBON ,  JIYAN RUI MERUSHIEERU

    IPC: G02B3/00 ,  G02C7/02

    Abstract: PURPOSE: To attain the suitable correction of astigmatism and field curvature by constituting a single focus lens having partially spherical convex and concave faces so that the refractive index is changed from the optical axis of the lens to its periphery and optical magnification is regulated only by the refractive index independently of geometric magnification. CONSTITUTION: The single focus lens for glasses has partially spherical concave and convex faces 11, 10, changes its refractive index from the optical axis X of the lens to the periphery and regulates the optical magnification only by the refractive index independently of geometric magnification. Thus, the use of the concave and convex faces 11, 10, fixed thickness and the merits of fine picture quality are suitably combined. Consequently, the single focus glasses lens allowed to be easily worked and capable of sufficiently correcting astigmatism and field curvature aberration and suitably reducing the thickness of the center part or the peripheral part is manufactured.

    AUTOMATIC EYE WIDTH METER
    25.
    发明专利
    AUTOMATIC EYE WIDTH METER 失效

    公开(公告)号：JPS6443229A

    公开(公告)日：1989-02-15

    申请号：JP18667488

    申请日：1988-07-26

    Applicant: ESSILOR INT

    Inventor： KURISUCHIYAN BOBUE

    IPC: A61B3/11

    Abstract: PURPOSE: To automatically measure the inter-pupil distance of a human by forming an instrumentation coordinate system with a series of reference light sources linearly arranged according to regular pitches, and reading the existence of multiple cornea reflected rays via its scanning. CONSTITUTION: Reference light sources 28 form parallel luminous segments. Basic light sources 16 generate cornea reflected rays in sequence. The cornea reflected rays processed by a detecting acceptor 20 are generated by the basic light source 16 nearest to the general visual line directions DO, DG of corresponding eyes OD, OG. For the measurement of half inter-pupil distances ED, EG in relation to the general visual line direction D with a conversion table, the cornea reflected rays formed along the visual line directions DO, DG parallel with the visual line direction D in relation to the reference light sources 28 are positioned. Peaks TD, TG corresponding to the cornea reflected ray by the right eye OD and the cornea reflected ray by the left eye OG appear on a cornea reflected ray generator 12. The positions of the peaks TD, TG can be obtained by a trigonometrical calculation.

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