READING GLASSES

Abstract

Reading glasses, more specifically pince-nez glasses, for short-term, close viewing and reading. For better placement of the reading glasses on the nose, the bridge of the reading glasses is provided with knobs, of which two are located on the outside, making it comfortable to grasp and place the glasses on the nose with two fingers and third knob is located on the upper centre of the bridge. Bridge of the reading glasses is ergonomic. The measurements of the radius of bridge of the reading glasses have been developed ellipsoidal in shape, where radius r.sub.1 is 7.0 mm and r.sub.2 is 7.5 mm and the angle ? of the bridge is 36?.

Claims

1. Reading glasses which have been made of plastic and include two lenses, a lens bridge connecting these and two nose pads on the lens bridge, wherein the radius of the lens bridge is ellipsoidal, wherein the radiuses r.sub.1 and r.sub.2 of the ellipse are from 6.00 to 9.00 mm, more particularly r.sub.1 is 7.00 mm and r.sub.2 is 7.50 mm; the inclination of the sides of the lens bridge of the reading glasses is between 32-40?, more particularly 36?; three studs are located on the outer surface of the lens bridge for placing the reading glasses on or taking them off with two or three fingers; the third stud located in the centre in the upper part of the lens bridge can be used for final placement/centring of the reading glasses with one finger.

2. Reading glasses according to claim 1, wherein the height of the nose pad is between 0.5-0.9 mm, more particularly 0.7 mm.

3. Reading glasses according to claim 1, wherein the nose pad is ellipsoidal, wherein the height of the ellipse is from 1.0 mm to 1.9 mm, more particularly 1.45, and the width of the ellipse is from 0.7 mm to 1.3 mm, more particularly 1.0 mm.

4. Reading glasses according to claim 1, wherein the upper edge of the nose pad is acute between 80-90?, more particularly 85?.

5. Reading glasses according to claim 1, wherein the bottom angle of the nose pad is obtuse between 135-152?, more particularly 143.5?.

6. Reading glasses according to claim 1, wherein the reading glasses have been made in one piece via casting.

7. Reading glasses according to claim 1, wherein the plastic material is copolyester.

8. Reading glasses according to claim 1, wherein the thickness of the reading glasses is from 0.5 to 1.25 mm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus, are not limitive of the present invention, and wherein:

[0016] FIG. 1 depicts radius r of the nose bridge;

[0017] FIG. 2 depicts the inclination angle ?.sub.1 of the side of the nose;

[0018] FIG. 3 depicts the reading glasses with a detailed view A of the nose pad of the reading glasses, cross-section B-B of the lens bridge of the reading glasses, and section C-C of the nose pad;

[0019] FIG. 4 depicts bending deformation f of the reading glasses;

[0020] FIG. 5 depicts the ratio of bending deformation f and bending force F in a table; and

[0021] FIG. 6 depicts one possible shape of the reading glasses.

DETAILED DESCRIPTION

[0022] FIG. 3 depicts reading glasses 1, intended for looking at something that is near and for reading for a short period of time; they include industrially-made lenses 2 with the same diopters and which are suitable only for the correction of presbyopia where both eyes need a corrective diopter of the same strength.

[0023] The ergonomic solution of reading glasses 1 corresponds to the measuring results that were used to develop the reading glasses. The measures have been taken from the noses of 76 persons. 51% of the persons are male and 49% female.

[0024] FIG. 1 depicts radius r of the nose bridge; this is one of the most important measures that ergonomic reading glasses, suitable for a universally large number of users, must comply with. The measuring results, with regard to radius r of the nose bridge, are as follows: [0025] 6 mm15% [0026] 7 mm38% [0027] 8 mm35% [0028] 9 mm12%

[0029] The average nose radius r is 7.44 mm.

[0030] FIG. 2 depicts another important measure which is inclination ?.sub.1 of the side of the nose.

[0031] The measuring results with regard to inclination ?.sub.1 of the side of the nose are as follows: [0032] 30?24% [0033] 40?32% [0034] 45?26% [0035] 55?19%

[0036] The average inclination ?.sub.1 of the side of the nose is 42.15?.

[0037] Therefore, the developed reading glasses 1 comply with the cross-section of an average nose and this has been depicted in FIG. 3.

[0038] The developed reading glasses 1 are also suitable for users whose nose bridge radius is bigger or smaller than the average. This is guaranteed by the elastic material used for making reading glasses 1 which allows deformation f per length l, as is shown in FIG. 4.

[0039] Copolyester has been chosen as the material of reading glasses 1 of the present invention. Copolyester is a transparent plastic which has good optical characteristics as well as good elasticity. So when moulding the glasses in one piece, the optical portion, as well as the lens bridge portion, have suitable characteristics.

[0040] This material is used to make reading glasses 1 having a thickness from 0.5 to 1.25 mm.

[0041] FIG. 3 depicts a cross-section of the upper part of the lens bridge 3 up to the nose pads 5, wherein section A-A is ellipsoidal and the diameter x times y thereof is from 0.6 to 1.0 mm times from 0.7 to 1.33 mm, more particularly 0.8 times 1.0 mm. Such a cross-section of the lens bridge 3 of glasses 1 has been chosen according to a desired elasticity. The wider the nose, the greater the pinch force F the nose pads 5 have on the nose, FIG. 4. An outcome is achieved where the pinch force is sufficiently great, with regard to narrower noses, so that the glasses would stay on the nose and the pinch force is still great enough with regard to wider noses so that the glasses would not push too greatly on the nose or inflict pain on the wearer or leave marks.

[00001]$f=\frac{{\mathrm{Fl}}^3}{8}?\frac{E}{I}$ [0042] f (bending deformation) [0043] F (force) [0044] l (bar length)15 mm [0045] E (elasticity module)1550 MPa [0046] I (moment of inertia)0.02512 kg m.sup.2

[0047] As is shown in FIG. 4 and in the table of FIG. 5, reading glasses 1 have been developed, wherein the radius of the lens bridge 3 is ellipsoidal. Radiuses r.sub.1 and r.sub.2 of the ellipse are from 6.0 mm to 9.0 mm. Radius r.sub.1 of the upper tip of the lens bridge is 7.00 mm and the radius r.sub.2 near the lateral studs 4 is 7.5 mm.

[0048] The inclination ? of the sides of the lens bridge 3 of the reading glasses 1 is from 32 to 40?, more particularly 36?. The inclination ? of the sides of the lens bridge 3 of the reading glasses 1 differs from the average inclination ?.sub.1 obtained from measuring such that the reading glasses 1 would put pressure on the nose. The inclination of 36? of the lens bridge 3 of the reading glasses 1 has been obtained based by the testing of various lens bridge prototypes. For better placement of reading glasses 1 on the nose, the lens bridge 3 of the reading glasses 1 has been equipped with studs 4 and 6, two studs 4 of which are located on the outer surface of the lens bridge 3 such that glasses can be conveniently placed on or taken off the nose by holding them with two fingers. The third stud 6 is located in the centre in the upper part of the lens bridge and is intended for final placement/centring of the glasses 1 with one finger.

[0049] FIG. 5 depicts detail A and section C-C of the nose pad 5 of the reading glasses 1. The nose pad 5 of the reading glasses 1 is unibody, i.e. in one piece, thus the material of the nose pad 5 is exactly the same as the material of the rest of the glasses 1. The shape of the nose pad 5 takes ergonomics into account. The cross-section of the nose pad 5 is ellipsoidal. The height b of the ellipse is from 1.0 to 1.0 mm, more particularly 1.45 mm, and the width c is from 0.7 mm to 1.3 mm, more particularly 1.0 mm. The height z of the nose pad is from 0.5 mm to 0.9 mm, more particularly 0.7 mm.

[0050] The angle ? of the upper edge of the nose pad 5 is acute from 80 to 90?, more particularly 85?, to provide a better hold. The bottom angle Y of the nose pad 5 is obtuse from 135 to 152?, more particularly 143?, to make the placement of the reading glasses on the nose more convenient.

[0051] When placing the reading glasses 1 on the nose, the nose pad 5 does not abrade the nose, i.e. the nose pad 5 has a smooth edge/connecting part in the lower part of the nose pad 5. The material used is so elastic that a great/strong pressure is not put on the nose.

[0052] The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are to be included within the scope of the following claims.