DE202016006264U1 - Arrangement for positioning a spectacle lens semifinished product - Google Patents

Abstract

Arrangement for positioning a spectacle lens semifinished product (2) which has an edge-shaped tube (3) for image coupling, the assembly comprising: - a support (4), opposite to a substantially spherical surface (5) of the spectacle lens - Halves (2) in the directions x, y and z can be positioned relative to a sphere center, - at least two stops (6 and 7), via which the spectacle lens semifinished with respect to the center of the sphere in the twisting directions Rx, Ry and Rz is positionable.

Description

The invention relates to an arrangement for positioning a spectacle lens semifinished product, which has a rim formed on the tube, which serves for coupling optical information into the material of the later spectacle lens inside. In particular, this optical information can lie in the visible spectral range and in particular can be images which are generated by an imager. Such generic data glasses are used in a spectacle frame and such glasses are commonly referred to as data glasses.

It is known to position spectacle lenses in the manufacturing process or in the adaptation of the glass to a spectacle wearer by attaching visible or invisible markings to one of the optical surfaces of the spectacle lens or the spectacle lens blank. In subsequent manufacturing steps, the glass or the blank is aligned with these markings. This accuracy of about 200 microns are achieved, which are usually considered sufficient. Also known is a referencing over an outer contour of the spectacle lens blank, which does not yet correspond to the final geometry of the edge, which serves for fitting the later finished spectacle lens into the spectacle frame.

In a spectacle lens into which optical information is to be coupled by means of an imager, in the production step in which the semifinished product of the spectacle lens (ie the still unfinished spectacle lens) is married to the imager, the semifinished product has already been cut out and has in its outer boundary the Final geometry of the later finished spectacle lens. The positioning accuracy to be provided during the production process of such a spectacle lens, in particular in the step of marrying the glass or semifinished product with the image generator, is difficult to achieve in series production with the means known from the prior art or only possible with a very high outlay.

The invention is intended to solve the problem of positioning a spectacle lens semi-finished product for data glasses, which already has its final geometry intended for the socket, more accurately and at a lower cost than was previously possible.

The object of the invention is achieved in that an arrangement is provided for positioning a spectacle lens semi-finished product, which has a rim formed on the tube. According to the invention, the arrangement comprises: a support against which a substantially spherical surface of the spectacle lens semifinished product can be positioned in the directions x, y and z relative to a sphere center; at least two stops over which the spectacle lens semifinished product can be positioned with respect to the center of the sphere in the twisting directions Rx, Ry and Rz.

In the present case, a substantially spherical surface means a surface which has at least one spherical component or can be reduced to a spherical base surface and for which a sphere center can be indicated.

By placing the spherical surface on the support, the component is positioned in the x, y and z directions with respect to the virtual sphere center. By means of the stops there is a further determination of the directions of rotation Rx, Ry and Rz with respect to the center of the sphere. An exactly determined positioning is thus given.

The directions x, y and z form an orthogonal coordinate system.

Advantageously, the support is designed as a (open or closed) annular cutting edge or as a three-point support

The spherical surface may be a front side or a rear side of the spectacle lens semifinished product.

The stops are preferably oriented substantially orthogonal to the receiving spherical surface (i.e., in particular the front of the spectacle lens semi-finished product).

It is preferably provided that the arrangement has a first bracket for fixing the spectacle lens semifinished product in the z-direction, which presses the spherical surface against the support. About the friction between the support and the front of the glass is sufficiently well for follow-up processes, such as the attachment of an imager or the installation in a measuring device fixed.

Furthermore, it can be provided that the arrangement has a second bracket for fixing the spectacle lens semifinished product in the x-direction and / or y-direction.

According to the invention, the spectacle lens semifinished product is positioned by fixed stop references on the tube. The geometry of the tube is particularly well suited for this, as it is independent of the later boundary of the lens and is not changed in later manufacturing steps. Also, the optical surfaces of the spectacle lens semi-finished (front and back) have in this stage of production already final quality and a surface coat.

About the sliding of the spectacle lens semi-finished on the support and applying the tube against the first stop and against the second stop is an exact positioning Since the tube includes at least one optical surface for image coupling, the dimensional accuracy of the tube is very good, ie forms the tube advantageous stop references for the first and the second stop, which allow a very high positioning accuracy. In particular, the achievable positioning accuracy can be less than 10 microns. The stops can advantageously act on the at least one optical surface of the tube or on different optical surfaces of the tube.

By means of a first and / or a second bracket, the spectacle lens semifinished product can then be fixed in the arrangement.

In particular, the arrangement can be used to add an imager with the required accuracy of less than 100 microns to the tube of the spectacle lens semifinished product.

The invention will be described below with reference to an embodiment. Show it:

1 : Arrangement for positioning a spectacle lens semifinished product with a spectacle lens semifinished product resting on a ring cutting edge.

2 : Arrangement for positioning a spectacle lens semifinished product in the positioned state of the spectacle lens semifinished product, resting against the abutments.

3 : Extract from 2 ,

4 : Arrangement for positioning a spectacle lens semifinished product in the positioned state of the spectacle lens semifinished product with fixing stirrups

1 shows a first embodiment of a positioning arrangement according to the invention ( 1 ) of a spectacle lens semi-finished product. The arrangement has a support ( 4 ), which in the embodiment of the 1 is designed as a ring cutter. On the ring cutting edge is a spectacle lens semi-finished ( 2 ) on. The spectacle lens semi-finished product ( 2 ) has a tube at the edge ( 3 ) for image coupling on. The tube is connected to the spectacle lens semi-finished product ( 2 ) or connected to the spectacle lens with the aid of another joining process, so that the spectacle lens semifinished product ( 2 ) and the tube ( 3 ) together form a one-piece optical element. The spectacle lens semi-finished product ( 2 ) lies in this example with the optical surface ( 5 ), which the front of the spectacle lens semi-finished ( 2 ). In the embodiment of 1 is the optical surface ( 5 ) a sphere. In the context of the invention, it may of course also be provided that the spectacle lens semifinished product ( 2 ) with its back, which forms another optical surface, is to be placed on the annular edge of the arrangement. The edition ( 4 ) sets the x, y and z orientation with respect to the virtual sphere center of the sphere ( 5 ) firmly. The edition ( 4 ) may alternatively be designed as a three-point support (not shown).

In 2 the arrangement according to the 1 shown from a different perspective. The spectacle lens semi-finished product ( 2 ) according to the 1 lies on the as a condition ( 4 ) and is connected to the tube ( 3 ) to a first stop ( 6 ) and a second stop ( 7 ). In this position, the spectacle lens semi-finished product ( 2 ) in the positioned state. The first stop ( 6 ) and the second stop ( 7 ) set the Rx, Ry and Rz coordinates with respect to the sphere center of the optical surface ( 5 ) firmly. The tube ( 3 ) has areas (in 2 not visible), the stop references for the first stop ( 6 ) and the second stop ( 7 ) form. The fact that the tube has optical surfaces and therefore worked very accurately, a high positioning accuracy is achieved. Preferably, the optical surfaces of the tube are used as stop references. In this case, the error in the positioning accuracy is mainly determined by the target deviation of the position of the optical surfaces of the tube relative to each other. Investigations by the applicant have shown that repeatable position accuracies of less than 10 μm can be achieved in this way. Positioner accuracy of this kind is necessary, for example, in order to connect an imager with the accuracy of less than 100 μm required for optical reasons to the tube (FIG. 3 ) of the spectacle lens semifinished product 2 ) to be able to add.

3 shows a part of the 2 in which the attacks ( 6 ) and ( 7 ) and the tube ( 3 ) are shown. The attacks ( 6 ) and ( 7 ) are in the embodiment of the 3 executed as linear stops, in such a way that an imaginary extension of the attacks ( 6 ) and ( 7 ) is orthogonal to the receiving sphere.

4 shows a further embodiment of an arrangement according to the invention for positioning ( 1 ) of a spectacle lens semi-finished product. The arrangement of 4 additionally has a first bracket ( 8th ), a fixation of the spectacle lens semi-finished product ( 2 ) in the z-direction, and a second bracket ( 9 ), a fixation of the spectacle lens semi-finished product ( 2 ) in the x-direction and in the y-direction, on. The means of the attacks ( 6 ; 7 ) in which the attacks ( 6 ; 7 ) and the edition ( 4 ) coordinate system (x, y, z) accurately positioned and by means of the bracket ( 8th ; 9 ) fixed spectacle lens semi-finished products ( 2 ) can further steps in the manufacturing process of the spectacle lens semi-finished ( 2 ), such as the step of joining the imager to the tube ( 3 ) of the glass ( 2 ).

LIST OF REFERENCE NUMBERS

1

Arrangement for positioning

2

Eyeglass semis

3

tube

4

edition

5

optical surface

6

first stop

7

second stop

8th

first temple

9

second bracket

10

Sphere center point

x-y-z

Directions in an orthogonal coordinate system

Claims (6)

Arrangement for positioning a spectacle lens semifinished product ( 2 ), which via a rim-shaped tube ( 3 ) for image coupling, the arrangement comprising: - a support ( 4 ), opposite to a substantially spherical surface ( 5 ) of the spectacle lens semi-finished product ( 2 ) is positionable in the directions x, y and z with respect to a sphere center, - at least two stops ( 6 and 7 ), via which the spectacle lens semifinished product can be positioned relative to the center of the sphere in the twisting directions Rx, Ry and Rz. Arrangement according to Claim 1, in which the support ( 4 ) is designed as a ring cutter or as a three-point support. Arrangement according to Claim 1 or Claim 2, in which the optical surface ( 5 ) a front side or a rear side of the spectacle lens semifinished product ( 2 ). Arrangement according to one of the preceding claims, in which the first stop ( 6 ) and / or the second stop ( 7 ) for the tube ( 3 ) are designed as stops whose imaginary extensions orthogonal to the receiving sphere of the optical surface ( 5 ) lie. Arrangement according to one of the preceding claims, wherein the arrangement comprises a first bracket ( 8th ) for fixing the spectacle lens semi-finished product ( 2 ) in the z-direction. Arrangement according to claim 5, wherein the arrangement comprises a second bracket ( 9 ) for fixing the spectacle lens semi-finished product ( 2 ) in the x-direction and / or y-direction.

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