EP1325372A1

EP1325372A1 - Printed circuit board with optical layers consisting of glass

Info

Publication number: EP1325372A1
Application number: EP00972622A
Authority: EP
Inventors: Elmar Griese; Andreas Himmler
Original assignee: Siemens AG
Current assignee: Siemens AG
Priority date: 2000-10-10
Filing date: 2000-10-10
Publication date: 2003-07-09
Also published as: WO2002031566A1

Abstract

The invention relates to a printed circuit board comprising electrical (51, 52, 53) and optical (22) conductors which are arranged in layers. An optical layer comprises a connected glass panel (20) in which areas of high optical density are optical conductors. The invention also relates to a method for producing said printed circuit board.

Description

international version

description

Printed circuit board with optical layers made of glass

Technical field

The invention relates to printed circuit boards with both electrical and optical conductors.

State of the art

For future information and communication devices, it is desirable to have circuit boards that allow both electrical and optical connections between the components. In the European patent application EP 0 598 966 AI optical waveguides are shown, those in column 6 lines 51-56 addressing those with a gradient structure and different geometries are shown below. Notes on the production of such optical waveguides are not listed in the prior art mentioned there. The conference report by E. Griese et.al., Electrical / optical circuit boards: Technology - Design - Modeling, 3rd Int. IEEE Workshop on "Signal Propagation on Interconnects", Titisee-Neustadt 1999.

So far, it has been proposed to make the optical conductors

Manufacture polymers because they are light and can be processed in many variants. However, there are problems with the integration into conventional printed circuit boards, since these are exposed to temperatures of 165 ° C. and pressures of 28 kp / cm ² during lamination, for example, so that the polymeric light guides can be deformed and damaged.

However, using glass optical guides would bring a large number of advantages. In the translation DE 691 15 276 T2 of the European patent ^¬ EP 0536312 Bl describes a fabrication of optical waveguides on metallic substrates by the electronic components already extensive, metallic or ceramic substrate is first applied a temperature-insensitive intermediate layer on the. Two layers of glass are then deposited thereon, the outer layer comprising the optical conductors and the inner layer serving as a waveguide cladding layer. Use on conventional printed circuit boards, for example made of epoxy resins, does not appear to be possible without further ado. In addition, the glass layer with the waveguides forms one of the two finished surfaces, so that they are unprotected. Furthermore, a device is required for the production with which glass layers can be applied additively. It is not possible to use prepared planar glasses.

The object of the invention is to provide printed circuit boards with optical layers of glass which are considerably less complex to manufacture, are suitable for printed circuit boards with synthetic resins as supports and avoid the disadvantages mentioned above.

The invention solves this problem by using optical layers made of flat glass, in which light guides are formed by zones of different optical density. These are represented by diffusion, as described, for example, in the article by L. Roß, Integrated Optics in Glasses, Technical Committee Report No. 74 of the German Glass Technology Society. So it is possible to get a one

To produce optical fibers corresponding to gradient fibers in optical layers together with electrical layers, without having to create and assemble individual optical conductors.

Further features and advantages of the invention result from the following description, which in connection with the two attached drawings, the invention is explained using an exemplary embodiment.

Brief description of the drawings

Show it

1 shows a cross section through a printed circuit board with electrical and optical conductors according to the invention,

Fig. 2 shows an alternative embodiment also as a cross section, and

Fig. 3 shows another embodiment also in cross section.

Description of an embodiment of the invention

1 shows a cross section through a printed circuit board, in which different layers are visible '. For the sake of clarity, the representation, like the other figures, is neither complete nor to scale. The cross section is perpendicular to the running direction of the optical and electrical conductors shown.

1 shows an insulating layer 10, an optical layer 20 designed according to the invention and described in more detail below, an optical cover layer 30, an insulating layer 40 and an electrical layer 50. In the electrical layer 50 there are electrical ones Conductors 51, 52 and 53 are indicated, which are applied additively or subtractively by known methods. Several layers of this type can be present. Likewise, the insulating layers 40 and 10 can be supplemented accordingly by electrical conductors, or further layers with electrical conductors can be applied to the layer 40.

The optical layer 20 is a thin (eg 0.5 mm thick) glass plate in which an optical conductor 22 is formed is that ions are introduced into the glass by a known diffusion process, which increase its optical density. Further information on the relevant state of the art can be found in the article by L. Roß: Integrated Optics in Glasses, in: Integrated Optics, Technical Committee Report No. 74, Deutsche Glastechnische Gesellschaft.

The manufacture of such a glass plate is based on a thin glass plate which is produced using known methods and e.g. is offered by the Schott company. What is important is an optically homogeneous structure. In order to be able to handle this glass plate, supports made of stainless steel, for example, can be used, on the surface of which a large number of channels which are connected to a vacuum pump end.

Conventional processes, i.e. a mask is applied by screen printing, photoresist or the like, which leaves the optical conductor paths to be created free. This mask is usually removed after the following step.

The surface of the glass plate is then wetted or immersed in a solution or melt in which ions are dissolved which penetrate into the glass plate at the locations which are kept free. These are chosen so that the optical density, i.e. the refractive index of the glass, there becomes larger than at the covered places. With increasing exposure time, the density of the ions and thus the refractive index increases. Depending on the type of ion and other process parameters, either a relatively uniform and homogeneous zone or an equally uniform but continuously decreasing density in the direction of the glass depth can be achieved.

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Claims

claims

1. Printed circuit board with electrical and optical conductors arranged in layers, since by markings that an optical layer comprises a coherent glass plate, in which zones of increased optical density are optical conductors, and the optical layer is between at least two electrical layers located.

2. Printed circuit board with electrical and optical conductors arranged in layers, the electrical conductors being arranged in or on insulating layers of synthetic resins, so that an optical layer comprises a continuous glass plate in the zones of increased optical density are optical conductors.

3. Printed circuit board according to claim 1 or 2, wherein the respective surface of the glass plate, to which the zones of increased optical density extend up to this surface, is immediately adjacent to an optically transparent cover layer, the optical density of which is smaller than that in the zones of increased optical density ,

4. Printed circuit board according to claim 1 or 2, wherein the optical layer consists of two optically directly superimposed glass plates with their surfaces that are constructed in mirror image with respect to this interface.

5. Printed circuit board according to one of the preceding claims, wherein the optical conductors are at least partially designed as gradient conductors.

6. Printed circuit board according to one of the preceding claims, wherein the cross section of the optical conductor along the direction of the optical conductor is position-dependent.

7. Printed circuit board according to one of the preceding claims, which has the optical conductors separating recesses in which the optical conductors can be coupled.

8. A method for producing a printed circuit board with electrical and optical conductors arranged in layers, comprising the steps:

a glass plate is coated with a mask, through which the areas provided for the optical conductors are determined,

the glass plate is subjected to a diffusion process which changes the optical density in regions determined by the mask,

- The glass plate is joined together with other, in particular insulating and electrical conductors comprising layers to form a circuit board.

9. The method of claim 8, wherein the mask leaves the areas provided for the optical conductors and the diffusion process increases the optical density.

10. The method according to claim 8 or 9, wherein an optical transparent layer is applied to the glass plate, the optical density of which is smaller than that of the optical conductor in the glass plate, before being joined together with the other layers.

11. The method according to claim 8 or 9, wherein prior to joining with the other layers, the glass plate is joined with a further glass plate.

12. The method according to any one of claims 8 to 11, wherein recesses are made after the layers have been joined, severing the optical conductors.