DE8710093U1 - Indication aid for eyeglass lenses - Google Patents

Description

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Description: Indication aid for eyeglass lenses

The innovation concerns an indication aid for spectacle lenses using a stamp figure to determine the dioptric values.

To determine the dioptric measurements - distance and near, multifocal lenses must be provided with a stamp. This is applied to the lenses by the manufacturer before they are sent to the optician. One method for applying the stamp at the manufacturer is the "tampoprint" process. The position of the stamp is usually based on a groove in the lens. After the lenses have been fitted and inserted into the frame, this stamp is removed using solvents.

If you want to check the dioptric readings or the adjustment later, as is necessary in the case of complaints, the lenses have to be sent back to the manufacturer or the measuring points have to be re-marked using relatively inaccurate measuring devices with the help of the wearer.

DE-PS 23 27 161 describes a method and a device for determining the position of the centering points of glasses lenses that are to be adjusted, whereby a swiveling mirror is used to project the measuring mark onto the wearer's glasses frame. The device is used in the patent specification to determine the centering points for adjustment, but is in principle also suitable for subsequent determination. The disadvantage is that the structure is far too complicated for determining the near/far measuring points.

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In PR-PS 76 38 642 a measuring glass is held in front of the lens in the k mount and by means of the measuring glass

The measured values on the lens are determined by the stamp figure printed on it. |

Since the alignment of the measuring glass is based on the nose pad of the 1 Spectacle frame is only an approximate indication of |

the lens possible. |

In US-PS 4 121 346 a device is described which 1 is clamped onto the lenses or their mount and by means of

a movable pin the measuring point for the proximity or the |

Can be determined from a distance with the cooperation of the wearer of the glasses |

Apart from the inaccuracy of the investigation by the

Cooperation of the spectacle wearer and the determination only in each case |

of a measuring point, the lens is positioned at the position shown there |

Socket directly mechanically loaded by the measuring device, |

thereby reducing the risk of surface damage to the &iacgr;

Pressure points on the lens cannot be ruled out. «j DE-PS 30 43 668 describes a complicated measuring and Centering device for adjusting glasses lenses,J

shown, which in principle also for a later determination *j

of the measuring points would be suitable for the dioptric values. Also ■*

Here the measuring point determination is without the involvement of the '■

This is not possible for the wearer of the glasses and the frame must be mechanically loaded to fix the device.

The aim of the innovation is to create an easy-to-use, To create display assistance for engraved eyeglass lenses that match the !

i Optician a subsequent determination of the dioptric

Values of spectacle lenses with high accuracy.

The problem is solved by the characterizing part of claim 1
solved by using a transparent foil with a pattern
to determine the measuring points for near/far and at least
a pattern for using a sufficiently large lens engraving
is available as an alignment aid.

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This new type of measuring point determination does not require the use of a filler cap when determining the measuring points of multifocal lenses and quickly and reliably leads to an accurate determination of the values to be determined. Neither the frame nor the lens are mechanically stressed. The alignment of the film is carried out using a sufficiently large lens engraving as an alignment aid.

The use of the film has the advantage that, thanks to its flexibility, the near/far measurement points can be determined precisely even with very curved lenses. Once the measurement point has been determined and measured _or marked, the film can be removed and reused for later determination of the measurement points. Because the film is designed as an adhesive film, there is no risk of surface damage even with vapor-deposited layers, as it adheres antistatically. This type of attachment to the lens is suitable for both plastic and silicate lenses. By printing the original stamp figure and positioning at least one sufficiently large manufacturer's mark, the film can be applied to the lens by aligning the film with the engraved manufacturer's mark on the lens. By punching out the film at the desired measuring point(s), the measurement can be taken with the film in place. An oval shape of the film is advantageous, as this can be used for all lenses. However, this only applies if the film does not exceed a certain maximum size of 40x50mm.

The innovation is explained below using Figures 1-2, where

Figure 1 shows the foil with a possible measuring figure;

Figure 2 shows the film on a not yet adjusted spectacle lens.

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Figure ¹¹ shows a film (1) with a pattern for drawing the measuring points: distance (4), near (3) and prism (5), which are at defined distances from each other (9,10,11,12 &tgr; ti MgUf 2). The manufacturer's mark (&dgr;) also present on the spectacle lens <7> in Figure 2 enables easy, precise drawing of the measuring points (3-5). The manufacturer's mark (8) is visible in the reflected or dark field. They can be drawn with a felt-tip pen and the film can then be easily aligned using these markings. The near point (3) is within a circular ring and its measuring surface inside has a diameter of 4 mm. Because the measuring surfaces (3,4) are punched out, the measurements on the lenses (7) in Figure 2 can be carried out with the film (1) in place. The prism measuring point (5) is punched out in such a way that it can be marked with a felt-tip pen for the measurement. The size of the film (1) is only 40x50mm, so that the edge (6) of the film (1) has no contact with the lens mount (7) in Figure 2 and the film (1) is therefore suitable for all mounts.

In Figure 2, the stamp figure can be seen on a lens (7) that has not yet been fitted. Since this is a silicate lens (7), there is a groove (6) in the upper area, which ensures that the manufacturer's mark is in the right place on the glass. This groove (6) is not necessary for plastic lenses, since the engraving is already present in the mold during their manufacture. An orientation aid of some kind is present on all lenses, since this is prescribed by DIN 58203, Part 4, Point 3.5 (marking). In addition to the stamp image on the film (1), a much larger company logo (2) is printed on the lenses supplied.

Claims (6)

Protection claims: 87021 6 1. Indication aid for engraved glasses lenses using a Stamp figure for determining the dioptric values, characterized in that a transparent foil with a
Patterns for determining the measuring points (e.g.
Near/Far/Prism) and at least one cougher for using a sufficiently large lens engraving as an alignment aid. 2., Sign aid according to claim 1, characterized in that the transparent film is an adhesive film. 3» Indication aid according to claim 1, characterized in that the film is provided at the measuring point or points for measuring
punched out with the foil applied. 4. Indication aid according to claim 1, characterized in that the film has an oval surface. 5. Indication aid according to claim 4, characterized in that the film has a maximum size of 40x50mm. 6. Indication aid according to claim 1, characterized in that the Huster for determining the measuring points as a stamp figure
printed on the foil.