DE8814085U1 - Telescopic lens - Google Patents

Description

Note Prof. Dr. med. Hermann Gerne*; 44 Münster DE Note No. 1318667

Telescopic lens

In three separate utility model applications (G 88 04 514.5, G 88 C7 504.4 and application dated November 7, 1988), a telescopic spectacle lens of various designs was described. The subject matter of the application from the three applications mentioned has so many optical advantages for the user that others could attempt to circumvent the subject matter of the application by underestimating the specified axial center thickness and steepening the spherical surface curvature of the telescopic spectacle lens accordingly.

In order to counteract this, the aim of this utility model application is, while retaining all statements in the introduction, the description, the protection claims and the drawings of G 88 04 514.5, G 88 07 504.4 and the application of November 7, 1988, to extend the protection claims to a smaller axial lens diameter of the telescope spectacle lens and accordingly to a smaller spherical front surface curvature and a smaller lens diameter at the boundary to the spherical front surface curvature.

In the following, another telescopic spectacle lens of different design is described with drawing.

Description

Figure 1 shows a Telesdop lens made of high-index glass with a refractive index of η = 2,020 in side view.

- 2

The spherical front surface curvature is 0.00402 m (4.02 mm = +253.43 Dptr), the spherical back surface curvature is 0.0015 m (1.5 mm = -680.00 Dptr). The largest lens diameter is 0.006 m (6.0 mm) and the axial lens thickness is 0.005 m (5.0 mm).

This telescope lens, which is located in front of both eyes of the user in a pair of telescope glasses, is afocal with a refractive power of 0 Dptr. It has a magnification of 2.6827 for a normal-sighted eye with the dimensions of the normal eye (Gernet).

If you want to use the telescope lens in Figure 1 to compensate for spherical refractive errors of the user's eye (for example + 2.75 Dptr for a normal eye with insufficient refractive power of its human eye lens) or the spherical refractive error of the dome section from P 35 90 114.4-51 (Figure 2, V = 1.38) mentioned in G 88 04 514.5 and G 88 07 504.4, the spherical front surface curvature does not have to be additionally adjusted due to the unusual shape of this telescope lens, but rather all the parameters of the telescope lens described can be retained. For the above-mentioned ametropia user's eye (+2.75 Dptr) the magnification is 2.7955.

Figure 2 shows a telescopic lens made of high-index glass with a refractive index of 2.02C in side view.

The spherical front surface curvature is 0.00301 m (3.01 mm = +338.33 Dptr/, the spherical back surface curvature is 0.0015 m (1.5 mm = -680.00 Dptr). The largest glass diameter is 0.0056 m (5.6 mm), the axial glass height is 0.003 m (3.0 mm).

This telescope lens, which is located in front of both eyes of the user in T'-lescope glasses, is afocal with a refractive power of 0 Dptr. It has a magnification of 2.0095 for a normal-sighted user eye with the dimensions of the normal eye (Gernet).

Figure 3 shows a telescopic lens made of high-index glass with a refractive index η = 2.020 in side view.

The spherical front surface curvature b. is 0.00201 m (2.01 mm = +507.49 Dptr), the spherical back surface curvature 0.0001 m (1.0 mm = -10200.00 Dptr). The largest glass diameter is 0.004 m (4 mm), the axial glass thickness is 0.002 m (2.0 mm).

This telescopic lens, which is located in front of both eyes of the user in a pair of telescopic glasses, is afocal with a refractive power of 0 Dptr. It has a magnification of 2.0095 for a normal-sighted user eye with the dimensions of the normal eye (Gernet).

Figure 4 shows a telescope lens made of high-refractive glass (refractive index η = 2.020) with such a strong spherical rear surface (inner surface) curvature that it can only be represented graphically as a point.

The spherical front surface curvature is 0.00111 m (1.11 mm = +919.00 Dptr), the spherical back surface curvature is 0.0001 m (0.1 mm = 10200.00 Dptr). The largest lens diameter is 0.0012 m (1.2 mm), the axial lens thickness is 0.002 m (2.0 mm).

This telescope lens, which is located in front of both eyes of the user in a pair of telescope glasses, is afocal with a refractive power of 0 Dptr. The lens has a magnification of II.0969 for a normal-sighted user eye with the dimensions of the normal eye (Gernet).

Claims (1)

- 5 protection claims (including G 88 04 514.5 and G 88 07 514.4 and the application dated 7.11.1988) 1) Telescopic spectacle lenses of various designs for telescopic spectacles for normal-sighted users, made of optical material «is glass, plastic, which is to be worn in conventional spectacle frames , characterized by lens diameters from 0.0012 m (1.2 mm) to 0.028 (28 mm) refractive indices from 1.349 to 2.150 Axial glass thicknesses from 0.002 m (2.0 mm) to 0.012 m (12 mm) Spherical front surface curvatures from 0.00111 m (1.11 mm) to 0.0174186 m (17.4186 mm) Spherical back surface curvatures from 0.0001 m (0.1 mm) to 0.011 m (11 mm) Telescope spectacle lens of various designs according to protection claim 1) with additional dioptric effect of the glass front lens to compensate for spherical refractive errors of ametropia of the user's eyes for distance and/or near vision and to compensate for refractive errors of telescope-like optical elements with spherical-concentric boundary surfaces that have a specific shape and data refractive index of 1.70 to 1.93
Thickness from 0.09 m to 0.32 m Outer radius rl of the spherical curvature from 0.15 -■ to 0.54 ir, Inner radius r2 of the spherical curvature from ö.ö9 m to 0.22 m and identical center of curvature of outer and inner curvature Telescopic spectacle lens of various designs according to protection claims 1) and 2) with additional] &tgr; rather toric curvature of the front surface to compensate for astigmatic refractive errors of the ametropia of users