Optical lens or lens group, process for the production thereof, as well as optical image acquisition device

a technology of optical lenses and lenses, applied in the field of hybrid lenses, can solve the problems of increasing demand, affecting the quality of optical images, and requiring the grinding of precision lenses made of glass at great expense and finished, and achieves the effect of simple and economical production processes and high resolution or imaging quality

a technology of optical lenses and lenses, applied in the field of hybrid lenses, can solve the problems of increasing demand, affecting the quality of optical images, and requiring the grinding of precision lenses made of glass at great expense and finished, and achieves the effect of simple and economical production processes and high resolution or imaging quality

US20070091472A1Inactive Publication Date: 2007-04-26SCHOTT AG
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  • Optical lens or lens group, process for the production thereof, as well as optical image acquisition device
  • Optical lens or lens group, process for the production thereof, as well as optical image acquisition device
  • Optical lens or lens group, process for the production thereof, as well as optical image acquisition device

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0065] A ceramic sphere that consists of Y2O3 is directly connected to a low-TG glass by means of a “precise pressing” process. The glass surface is then aspherical. The selection of the ceramic and the glass is carried out such that, i.a., the partial dispersions are as optimally suitable as possible to avoid chromatic aberrations.

[0066] For this purpose, a ceramic sphere that consists of Y2O3 with a diameter of 3 mm is inserted into a suitable precision blank compression mold. A matching glass element that consists of N-SK57 glass (Schott) is applied, and the press is closed. The compression molds are highly precisely formed. In this case, the glass side of the form has an aspherical configuration. The sandwich is heated to 650° Celsius at a heating rate of 10K / minute, and it is pressed for 15 minutes there at a suitably high pressing pressure. The cooling is carried out at a speed of 30 K / minute.

[0067] The surface quality of the glass was sufficient so that no further surface f...

embodiment 2

[0068] By precision blank pressing (precise pressing), as described above based on embodiment 1, a hybrid lens that consists of a glass and an optoceramic is formed. Then, a polymer is sprayed on by means of an injection-molding process, which resulted in a hybrid lens comparable to that according to FIG. 2. The surfaces of the hybrid lens did not require any further finishing.

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Abstract

The invention relates to an optical hybrid lens. According to the invention, the lens consists of a substrate (1) that consists of a ceramic having a predetermined shape and at least another material (2), which covers a surface of the substrate (1) at least in certain sections in order to form a lens surface. Use of an optical ceramic as a material enables an additional degree of freedom for adjusting the imaging properties of the hybrid lens. The optical ceramic may have a high refractive index and a low dispersion. The other material can be a material that can be deformed or recast at temperatures that are low in comparison to those of the optical ceramic. In particular the other material can be a low-TG glass or a polymer. The other material is directly applied onto the substrate without a further surface finishing being necessarily required. Other aspects of the invention relate to an optical lens group, an optical image acquisition device, and a process for manufacturing a hybrid lens.

Description

[0001] This application claims the priority of the German Patent Application 10 2005 045 197.7 “Optical Lens or Lens Group, Process for the Production Thereof as Well as Optical Image Acquisition Device,” filed on Sep. 21, 2005, whose content is expressly included herewith by way of reference. FIELD OF THE INVENTION [0002] This invention relates in general to the field of optical lenses and relates in particular to hybrid lenses that consist of at least two different materials. BACKGROUND OF THE INVENTION [0003] Hybrid lenses, which consist of different materials, are known in the form of glass polymer hybrids from the prior art. The latter consist of a glass, generally in spherical shape, which is surrounded by a polymer, generally with an aspherical outside shape. The hybrid lenses thus consist of at least two different materials with different refractive indices and different dispersion. By using at least one other material, the imaging properties of the hybrid lens, in particula...

Claims

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Application Information

Patent Timeline
26 Apr 2007
Publication
US20070091472A1
IPC
G02B9/00
CPC
G02B3/00; G02B5/1852; G02B5/1857; G02B5/1895; G02B27/4211
Inventors
ALKEMPER, JOCHEN; HAYDEN, JOE