WO2017068113A1

WO2017068113A1 - Spectacles lens with attached additional component

Info

Publication number: WO2017068113A1
Application number: PCT/EP2016/075357
Authority: WO
Inventors: Florian Kühnlein; Simon JASCHKE
Original assignee: Uvex Arbeitsschutz Gmbh
Priority date: 2015-10-23
Filing date: 2016-10-21
Publication date: 2017-04-27
Also published as: DE102015220787A1

Abstract

The spectacles lens (2) is a double layer lens having two single-part single-layer lenses (6, 7) joined together by a connection region (5). A lens base body comprising the two single-layer lenses (6, 7) and the connection region (5) is produced from or with a transparent lens material in the form of a first plastic material, wherein the lens material is polycarbonate. The lens base body is coated with a coating made of a coating material, and includes at least one coating-free sub-region. An additional component (8; 9, 10, 11) configured as a single component is attached directly to the lens base body in the coating-free sub-region of the lens base body. The additional component (8; 9, 10, 11) is produced from or with an additional component material in the form of a second plastic material, wherein the additional component material is a thermoplastic elastomer, and an adhesive force of the additional component material to the lens base body within the coating-free sub-region is greater than within another sub-region coated with the coating material. In this way, an adhesive bond is provided directly between the additional component material and the lens material. The additional component is a nose pad (9) or a forehead rest (10), or comprises same.

Description

Spectacle lens with attached additional component

The present patent application claims the priority of German patent application DE 10 2015 220 787.0, the content of which is incorporated herein by reference.

The invention relates to a spectacle lens in the form of a double-vision disc with two individual sight discs integrally connected to one another by means of a connection region. Moreover, the invention relates to a method for producing such a spectacle disk.

Such a spectacle lens is used, for example, in safety goggles. In order to be able to place the spectacle lens of such spectacles on the face of a spectacle wearer, a nose pad is provided in addition to the spectacle arms. The spectacle lenses known safety goggles are often provided with a coating to improve the scratch resistance and / or anti-fog. These coatings have hydrophobic properties, which is why the connection between the spectacle plate and the nose pad is effected by means of a separate mechanical holder. The nose pad is in such known embodiments then often designed as a two-component plastic component whose harder first component is used for mechanical attachment to the lens and whose softer second component is designed for comfortable attachment to the nose of the wearer. Such eyewear are elaborate in the production. In addition, the mechanical connection between the spectacle plate and the (two-component) nose pad is sometimes not stable enough, so that there may be a loss of the nose pad. In EP 2 019 331 B1 another embodiment of rimless spectacles with two separate individual lenses and a method for producing such spectacles is described. The individual lenses are provided with a coating that has dirt-repellent properties and improves scratch resistance. This coating is removed in a partial region of the individual lenses by means of a laser tool in order to be able to attach a connecting bridge between the two spectacle lenses in this area. This connecting bridge, to which the nose pad is also mechanically fastened, is adhesively bonded to the bonding surfaces previously freed from the coating by means of an adhesive. Also, this method for producing a pair of glasses is expensive.

An object of the invention is to provide a spectacle lens of the type described above with respect to the known spectacle lenses improved properties.

To solve this problem, a spectacle lens according to the features of claim 1 is given. The spectacle plate according to the invention is one in which a disc base body comprising the two individual sight discs and the connection region is made of or with a transparent disc material in the form of a first plastic material, the disc material being polycarbonate. The disc body is coated with a varnish of a varnish material. The Scheibengnmdkörper contains at least one paint-erased portion, the paint release is carried out in particular by means of a separate treatment step. In addition, in the paint-free portion of the disk base body, a one-component configured additional component is attached directly to the disk body. which additional component is made from or with an additional component material in the form of a second plastic material, wherein the additional component material is a thermoplastic elastomer and an adhesive force of the additional component material is higher on the Scheibengrund- body within the paint-erased portion than within another coated with the paint material portion. In this case, an adhesive bond is given directly between the additional component material and the disc material. Furthermore, the additional component is or has a nose pad, or it is a forehead rest or has such.

The spectacle lens according to the invention is characterized by a very good adhesion of the additive component to the disk base body, advantageously no separate adhesive layer being required for this good adhesion. This will in principle avoid errors that would otherwise be due to a failure of such a separate adhesive layer. Instead, the good bond is given directly between the additional component material and the disk material of the disk base body. This simplifies the manufacturing process of the lens and also leads to very good performance characteristics, since on the one hand due to the high adhesive force loss of the additional component is not to be feared and on the other the other properties of the additional component, such as flexibility and softness, to the comfort needs of Spectacle wearer can be adjusted.

In this respect, it is advantageous that the additional component due to their direct attachment to the disc base body does not have to be executed in two-component with an otherwise possibly the wearing comfort possibly reducing hard component. The in the erfmdungsgemä- The spectacle disk existing one-component design of the additional component simplifies the production of the spectacle lens.

The intended as a disc material polycarbonate is transparent and is therefore well suited for use as a material of a spectacle lens. The thermoplastic elastomer provided as an additive component material, which is e.g. Urethane-, Esther- or ether-based, has a good mechanical elasticity and is also bendable, so that the additional component made of such a material on contact with the eyes or the skin of the wearer provides a high wearing comfort.

The additional component is e.g. a nose pad. However, it can also be embodied as a forehead system, which preferably extends in particular at the upper end edge of the spectacle lens essentially over the entire width of the spectacle disk, and which is intended to bear against the forehead of the spectacle wearer.

In particular, the spectacle plate according to the invention is intended for use in safety goggles. For this application, the spectacle lens is particularly well, because there are high demands on robustness and mechanical strength, which is the spectacle according to the invention justice. Likewise, the spectacle lens according to the invention increases the safety, since an improved grip on the head of the spectacle wearer is achieved during movements by the soft nose pad and the acceptance is made to wear due to the pleasant wearing comfort. In principle, however, the spectacle lens according to the invention can also be used in other spectacle types, such as sports or sunglasses. Advantageous embodiments of the spectacle lens according to the invention emerge from the features of the claims dependent on claim 1.

A refinement is advantageous in which a cohesive connection between the disk material and the additional component material is provided in the part of the disk body which has been removed from the paint. This is in particular an immediate or direct connection, i. in particular without an interposed adhesive layer. Such a cohesive connection ensures a bond with a high holding or adhesive force.

In accordance with a further advantageous embodiment, the lacquer-liberated partial area has a rougher surface compared to further partial areas of the disc body formed by at least one of the individual lenses. The roughening enlarges the surface and thus improves the holding or adhesive force that can be achieved between the pane material and the additional component material in the lacquer-free partial area.

According to a further advantageous embodiment, the lacquer-exposed portion of the disc body is laser-beam treated for lacquer removal. By means of laser radiation, the paint coating of the disk body can be very simple and at the same time completely, ie in particular remove without remaining in this part of paint residues. The latter in turn favors the holding or adhesive force between the disc material and the additional component material. In particular, the energy of the laser radiation can be adjusted without difficulty in such a way that the paint coating in the desired subregion is actually removed without residue by the incident laser radiation. According to a further advantageous embodiment, a surface of the paint-erased portion is compared with a surface of an adjacent coated with the paint material portion by 2 μηι to 10 μηι, in particular by 4 μηι to 7 μηι, deeper. This means, in particular, that a removal of material of a thickness with a value from the abovementioned value range has taken place in the paint-removed subregion. Thus, the paint is advantageously completely removed here.

According to a further advantageous embodiment, the lacquer-exposed portion of the disk base body has a surface tension in the range between 40 mN / m and 50 mN / m, in particular between 42 mN / m and 44 mN / m. As a result, a high holding or adhesive force between the disc material and the additional component material is also achieved.

According to a further advantageous embodiment, the paint-liberated portion is at least partially in the connecting region between the two individual lenses. Another object of the invention is to provide a method of the type described, by means of which a spectacle lens can be produced better compared to the prior art.

To solve the problem relating to the method, a method for producing a spectacle lens according to the features of claim 8 is given. In the method according to the invention, a disk base body comprising the two individual sight glasses and the connection region is made of or with a transparent disk material manufactured in the form of a first plastic material, wherein the disc material is polycarbonate. The disk base body is coated in particular everywhere or completely with a paint material and in particular subjected to a drying or curing process. The applied lacquer material is removed again within at least one partial region, as a result of which a lacquer-free partial region of the disc main body is formed. In addition, an additional component material in the form of a second plastic material is molded directly onto the disk base body in the paint-free portion of the disk base body so as to attach to the disk body a one-component configured additional component, wherein the additional component material is a thermoplastic elastomer. Furthermore, the additional component is or has a nose pad, or it is a forehead rest or has such.

The inventive method and its embodiments essentially offer the same advantages that have already been described in connection with the spectacle lens according to the invention and its embodiments.

The partial process steps described above can advantageously be carried out within a combination plant. This allows a particularly fast and very efficient production of the spectacle lens.

Advantageous embodiments of the method according to the invention emerge from the features of the claims dependent on claim 10. Further features, advantages and details of the invention will become apparent from the following description of exemplary embodiments with reference to the drawing. 1 shows an exemplary embodiment of a safety goggle with a spectacle lens in the form of a double-layered lacquer-coated disc and directly molded-on nosepiece and forehead appliance in a perspective view, FIG. 2 shows a cross-section through that indicated by II in FIG

Part of the spectacle lens of the safety goggles according to FIG. 1

3 in a partially manufactured state after the paint coating,

Fig. 4 shows the detail IV of FIG. 3 after a paint removal in

several portions of the spectacle lens, and the spectacle lens according to FIGS. 3 and 4 after the attachment of the nose pad and the forehead rest in the paint-removed portions.

Corresponding parts are provided in FIGS. 1 to 5 with the same reference numerals. Also details of the embodiments explained in more detail below may constitute an invention in itself or be part of an inventive subject matter.

In Fig. 1, an embodiment of a safety goggles 1 is shown, which is a spectacle plate 2 with it swivel-mounted temple pieces. 3 and 4. The spectacle plate 2 is a double-vision disc with two individual sight discs 6 and 7 which are integrally connected to one another by means of a connection region 5. The spectacle plate 2 comprises a disc base 2a (see cross-sectional illustration according to FIG. 2) which consists of a transparent disc plastic material. In the example shown, the disc plastic material is polycarbonate. The disc base body 2a comprises both the two individual sight discs 6, 7 and the connection region 5. To improve the disc properties, for example to increase the scratch resistance, the disc base body 2a is provided with a coating in the form of a paint 2b. The lacquer material of this likewise transparent lacquer coating is first applied to the disc base body 2 a throughout the production. This completely coated with the paint 2b state of the disk base body 2a is shown in the figure of FIG. 3. The paint 2b is μηι with a thickness of a few micrometers, in particular with a thickness of 4 μηι to 7, preferably with about 5 μηι, applied to the disk base body 2a.

In the end state of the safety goggles 1 shown in FIG. 1, the spectacle lens 2 comprises an additional component 8 attached directly to the disk base 2 a, which consists of a plurality of subcomponents, namely a nose pad 9, a forehead rest 10 and between the nose pad 9 and the forehead rest 10 extending connecting web 1 1 composed. In the embodiment shown, the sub-components 9 to 1 1 are integrally connected. However, this is not mandatory. In principle, at least some of these subcomponents could also be used as separate additional components directly on the windscreen substrate. be attached body 2a. Thus, a further embodiment not shown in the figures is conceivable, in which two separate additional components in the form of the nose pad 9 and the end system 10 are mounted separately on the disk base body 2a. Likewise, it is possible that only a single additional component, for example only the nose pad 9, is provided.

The nose pad 9, the front face 10 and the connecting web 1 1 of the additional component 8 consist in the Ausführungsbeii- shown in Fig. 1 of a thermoplastic elastomer. Since the paint coating applied on the disk base body 2a initially has hydrophobic properties, only a comparatively low adhesive force of the material of the additional component 8 on the paint material results. The surface tension of the lacquer-coated disk base body 2a is in particular in the range between 1 1 mN / m and 14 mN / m. In order to increase the adhesive force between the additional component 8 and the disk base body 2a, in the subregions of the spectacle lens 2, in which the attachment of the additional component 8 with its components, ie the nose pad 9, the end system 10 and the connecting web 1 1, hen provided is, the paint 2b removed by means of a laser beam treatment again. As a result, the coating-freed subregions 12, 13 and 14, which are hatched in the detail view according to FIG. 4, are then directly molded onto the material of the additional component 8 in a further processing step. This results in a cohesive connection between the material of the additional component 8 and the material of the disc body 2a. The adhesive force of this compound is significantly higher than that which would be achieved on a lacquer-coated portion of the lens 2. In the paint-removed sub-areas 12, 13 and 14, the surface tension is also significantly higher, namely in the range between 42 mN / m and 44 mN / m, for example at 43 mN / m. As a result of the laser beam treatment, material corresponding to approximately the thickness of the coating with the paint 2b, that is to say material of a thickness in the range between 4 μm and 7 μm, is removed. Apart from the material removal, the laser beam treatment also causes a surface roughening, which likewise has a favorable effect on the finally achievable adhesive force between the material of the additional component 8 and the material of the disk base body 2 a. The thus prepared spectacle lens 2 with the apart from the paint-freed subregions 12, 13 and 14 lacquer-coated disk base body 2a and just on the paint-freed subregions 12, 13 and 14 directly applied additional component 8 (consisting of the nose pad 9, the forehead system 10 and the connecting web 1 1) is shown in the figure of FIG. 5.

Claims

claims

Spectacle lens in the form of a double-vision lens with two individual sight discs (6, 7) connected together in one piece by means of a connecting region (5), wherein

a) a disk base body (2a) comprising the two individual sight sheets (6, 7) and the connection region (5) is produced from or with a transparent disk material in the form of a first plastic material, the disk material being polycarbonate,

b) the disk base body (2a) with a paint (2b) of a

Paint material is coated,

c) the disk base body (2a) contains at least one paint-liberated portion (12, 13, 14), and

d) in the paint-removed portion (12, 13, 14) of the Scheibengrundkör- pers (2a) a one-component configured additional component (8; 9, 10, 1 1) directly to the disk base body (2a) is mounted, which additional component (8; 10, 1 1) is made of or with an additional component material in the form of a second Kunststoffmateri- as, wherein the additional component material is a thermoplastic elastomer and an adhesive force of the additional component material on the disc base body (2a) within the lacquer-liberated portion (12, 13, 14) higher e) wherein an adhesive bond is present directly between the additional component material and the disc material, and f) wherein the additional component (8) is a nose pad (9) or an end system (10), or Additional component (8) has a nose pad (9) or a frontal attachment (10). Spectacle lens according to claim 1, characterized in that in the paint-removed portion (12, 13, 14) of the disk base body (2a) is a cohesive connection between the disk material and the additional component material is given.

Spectacle lens according to claim 1 or 2, characterized in that the paint-liberated portion (12, 13, 14) compared with at least by the individual lenses (6, 7) formed further portions of the disk base body (2a) has a rougher surface.

Spectacle lens according to one of the preceding claims, characterized in that the paint-liberated portion (12, 13, 14) of the disk base body (2a) is laser-treated for paint removal.

Spectacle lens according to one of the preceding claims, characterized in that a surface of the paint-erased portion (12, 13, 14) compared to a surface of an adjacent coated with the paint material portion by 2 μηι to 10 μηι, in particular by 4 μηι to 7 μηι, deeper lies.

Spectacle lens according to one of the preceding claims, characterized in that the paint-liberated portion (12, 13, 14) of the disk base body (2a) has a surface tension in the range between 40 mN / m and 50 mN / m, in particular between 42 mN / m and 44 mN / m, has. Spectacle lens according to one of the preceding claims, characterized in that the paint-liberated portion (12, 13, 14) in the connecting region (5) between the two individual lenses (6, 7).

Method for producing a spectacle plate (2) in the form of a double-vision disc with two individual sight discs (6, 7) connected together in one piece by means of a connection region (5), wherein a) a disc body comprising the two individual sight discs (6, 7) and the connection region (5) (2a) is produced from or with a transparent disk material in the form of a first plastic material, wherein the disk material is polycarbonate,

b) the Scheibengnmdkörper (2a) is coated with a paint material,

c) the applied paint material is removed again within at least one partial area, whereby a lacquer-free partial area (12, 13, 14) of the disc body (2a) is formed, and d) in the lacquer-free partial area (12, 13, 14) of the disc body (2a) an additive component material in the form of a second plastic material is injected directly onto the disc body (2a) so as to attach to the disc body (2a) a one-component additional component (8; 9, 9, 10), the additional component material being a thermoplastic elastomer,

e) wherein the additional component (8) is a nose pad (9) or an end system (10), or the additional component (8) has a nose pad (9) or a forehead attachment (10).

9. The method according to claim 8, characterized in that in the paint-free portion (12, 13, 14) of the disk base body (2a) a cohesive connection between the disk material and the additional component material is formed.

10. The method according to claim 8 or 9, characterized in that the

Forming the lacquer-free portion (12, 13, 14), the lacquer material is removed by means of a laser radiation.

1 1. A method according to any one of claims 8 to 10, characterized in that the surface of the disk base body (2a) is roughened in paint-free portion (12, 13, 14).

12. The method according to any one of claims 8 to 1 1, characterized in that the formation of the lacquer-free portion (12, 13, 14) material of a thickness in the range between 2 μηι and 10 μηι, in particular between 4 μηι and 7 μηι, is removed ,

13. The method according to any one of claims 8 to 12, characterized in that in the paint-exposed portion (12, 13, 14) of the disk base body (2a) has a surface tension in the range between 40 mN / m and 50 mN / m, in particular between 42 mN / m and 44 mN / m.