Liquid crystal component

• US 20060086448A1
• Filed: 12/16/2003
• Published: 04/27/2006
• Est. Priority Date: 12/30/2002
• Status: Abandoned Application

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips N.V.
• Inventors: Stapert, Hendrik Roelof, Verstegen, Emile Johannes Karel
• Application Number:
  US10/540,684
• Publication Number:
  US 20060086448A1
• Time in Patent Office: Days
• US Class Current: 156/60
• CPC Class Codes: B29D 11/00442 Curing the lens material
• CPC Class Codes: B29L 2011/0016 Lenses
• CPC Class Codes: G11B 2007/0006 adapted for scanning different types of carrier, e.g. CD & DVD
• CPC Class Codes: G11B 2007/0013 for carriers having multiple discrete layers
• CPC Class Codes: G11B 7/1369 Active plates, e.g. liquid crystal panels or electrostrictive elements
• CPC Class Codes: G11B 7/1374 Objective lenses optical objectives per se G02B9/00
• CPC Class Codes: G11B 7/22 Apparatus or processes for the manufacture of optical heads, e.g. assembly
• CPC Class Codes: Y10T 156/10 Methods of surface bonding and/or assembly therefor

Abstract

A method of manufacturing a component comprising liquid crystal is described. The method comprises placing a liquid crystal (200) between a substrate (150) and a mould (100), the mould (100) having a shaped surface (102). At least a portion of the shaped surface (102) has an alignment layer (110) formed on it. The substrate (150) has a first surface (152) on which is formed a bonding layer (120). Mould and substrate are brought together so as to sandwich liquid crystal between the first surface of the substrate and the shaped surface of the mould. The liquid crystal (202) is polymerised and thereby adhered to the bonding layer (120). The substrate (150) with the adhered polymerised liquid crystal (203) is removed from the mould (100).

Claims

1. A method of manufacturing a component comprising liquid crystal, the method comprising:

placing a liquid crystal between a substrate and a mould, the mould having a shaped surface, at least a portion of the shaped surface having an alignment layer formed thereon, and the substrate having a first surface on which is formed a bonding layer;

bringing the mould and the substrate together so as to sandwich the liquid crystal between the first surface of the substrate and the shaped surface of the mould;

polymerizing the liquid crystal;

adhering the liquid crystal to the bonding layer; and

removing the substrate with the adhered polymerized liquid crystal from the mould.

2. A method as claimed in claim 1, wherein the bonding

layer comprises at least one chemical having a covalently bonded reactive group of the same family of groups to a reactive group of the liquid crystal, such that when the liquid crystal is polymerized, the liquid crystal is adhered to the bonding layer by chemical bonds being formed between the bonding layer and the liquid crystal.

4. A method as claimed in claim 1, wherein an alignment layer is formed upon the first surface of the substrate.

5. A method as claimed in claim 4, wherein a single layer is used to provide both the alignment layer on the substrate and the bonding layer.

6. A method as claimed in claim 1, wherein at least one of the substrate and/the mould are provided with an adhesion layer.

7. A method as claimed in claim 6, wherein said adhesion layer comprises an organosilane compound.

8. A method as claimed in claim 7 wherein said organosilane compound comprises a methacrylic reactive group or an amino end group.

9. A method as claimed in claim 1, wherein the substrate comprises an optically transparent material.

10. A method as claimed in claim 1, wherein the shaped surface of the mould is a curved surface, such that the substrate and the adhered liquid crystal form a lens.

11. A method as claimed in claim 1, further comprising the step of:

applying the alignment layer to the shaped surface of the mould, and inducing a specific orientation in the alignment layer.

12. An optical component comprising a liquid crystal, at least a portion of the optical component being formed according to the method as described in any one of claims 1.

13. An optical component as claimed in claim 12, wherein said optical component comprises a lens.

14. An optical scanning device for scanning an information layer of an optical record carrier, the device comprising a radiation source for generating a radiation beam and an objective system for converging the radiation beam on the information layer, wherein the device comprises an optical component formed according to the method as claimed in claim 1.

15. A device as claimed in claim 14, wherein the objective system comprises a lens formed.

3. A method as claimed in claim 3, wherein the bonding layer comprises a chemical having a reactive group comprising at least one of acrylate, methacrylate, epoxide, oxetane, thiolene and vinylether.