Lamination of optical substrates
AssigneeBAE SYSTEMS plc
InventorsVincent Andrei Handerek, Murray James Todd
Life of this patent
Estimating the term…
Abstract
A method is provided for laminating optical substrates and in particular for manufacturing a thin combiner for an optical display that preserves the flatness of the component parts and ensures an even separation of layers, in particular an optical substrate and a thin cover plate that is to be bonded to the substrate. In the method, spacer particles in a predetermined size range are included within a glue layer at a required density to ensure cover plate flatness and uniform separation during assembly.
Claims29
A method for manufacturing a combiner for a display device, wherein the combiner comprises a flat optical substrate, a cover plate and a grating layer applied to the flat optical substrate or to the cover plate, the method comprising the steps of:
- (i) applying a predetermined volume of glue to a bonding surface of the optical substrate;
- (ii) applying a plurality of spacer particles of sizes within a predetermined size range onto the bonding surface of the optical substrate;
- (iii) bringing the cover plate into contact with the glue such that the weight of the cover plate causes the glue to spread uniformly over the bonding surface of the flat optical substrate to form said layer of glue and whereupon said cover plate is separated from said flat optical substrate by said plurality of spacer particles;
- and
- (iv) curing the glue.
A method for manufacturing an optical device, wherein the optical device comprises a first optical substrate layer and a second optical substrate layer, the method comprising the steps of:
- (i) applying a predetermined volume of glue to a bonding surface of the first optical substrate layer;
- (ii) applying a plurality of spacer particles of sizes within a predetermined size range onto the bonding surface of the first optical substrate layer;
- (iii) bringing the second optical substrate layer into contact with the glue applied to the first optical substrate layer such that the weight of the second optical substrate layer causes the glue to spread uniformly over the bonding surface of, the first optical substrate layer to form said layer of glue and whereupon said second optical substrate layer is separated from said first optical substrate layer by said plurality of spacer particles;
- and
- (iv) curing the glue.
(canceled)
A combiner for a display device, comprising a flat optical substrate, a cover plate and a grating layer applied to the flat optical substrate or to the cover plate, wherein the cover plate is bonded to the flat optical substrate by a layer of glue containing spacer particles of sizes substantially within a predetermined size range, the thickness of the layer of glue is substantially within the predetermined size range of the spacer particles and the spacer particles are distributed within the layer of glue with a predetermined maximum spacing.
(canceled)
Dependencies are inferred from the claim text.