Centre National De La Recherche Scientifique

Essilor International (compagnie Generale D'optique)

Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Essilor International

Centre National De La Recherche Scientifique-cnrs

Pierre Chavel

Jean-Paul Cano

Christian Bovet

Marius Peloux

Jerome Ballet

Céline Benoit

Jérôme Ballet

Paul Lefillastre

François Goudail

Pierre-Antoine Frugier

Patrick Mercier

Jean Paul Cano

A method of designing an imaging system including an optical system having a longitudinal optical axis, an image sensor and a spatial filter, the imaging system being configured to form an image of a focusing plane on the image sensor. The optical transfer function of the optical system combined with the spatial filter is calculated as a function of the image spatial frequencies, and of the focusing defect (&#x3a8;), so as to determine a contrast map and a phase map of the optical system combined with the pupil function of the spatial filter, the contrast map and the phase map being a function, of the spatial frequency (f), and of the focusing defect (&#x3a8;), and it is determined, based on these maps, a value of longitudinal extension (|P|) of the imaging system focusing depth domain in the useful range of spatial frequencies ([&#x2212;fc; fc]) and an average contrast.

Method of designing an imaging system, spatial filter and imaging system including such a spatial filter

A system includes a simultaneously bifocal diffractive lens component having a first focal point, a second focal point and a plurality of diffractive zones including a central zone and a plurality of annular concentric zones surrounding the central zone, the lens component having a first optical power and a second optical power associated with the first and second focal points respectively, the first and second focal points respectively corresponding to points of convergence of the most luminous orders of diffraction generated by the lens component for a nominal wavelength, the first system focal point and the second system focal point having a position dependent upon the value of the first optical power and the second optical power of the lens respectively, the central zone having a surface area value determined as a function of the pupil of the optical system, of the first optical power and the second optical power.

System comprising a multifocal diffractive lens component

The invention relates to a transparent optical component having a cellular structure, comprising a network of walls (), that forms a set of cells () that are juxtaposed parallel to a component surface. In order to produce such a component, an irregular set of points () in the surface of the component is determined, each point being used to form a center of one of the cells. A position and an orientation of each wall are then determined such that the set of cells forms a Vorono&#xef; partition of the surface of the component. The component has a level of transparency that is compatible with an optical or ophthalmological use.

Production of a transparent optical component having a cellular structure

A transparent optical element (), includes a plurality of stacked layers (), each of which consist of cells in which optical phase-shift values are provided. The layers are arranged such that boundaries between certain contiguous cells of one of the layers cut into cells of another layer. In this way, a useful apparent cell size can be reduced so as to reproduce a target optical phase-shift distribution with greater precision. Additionally, the maximum amplitude of optical phase shift variations that are produced by the element increases with the number of stacked layers. The chromatism of the diopter function of the element can also be reduced.

Transparent optical element having a plurality of layers consisting of cellular tiling

A transparent optical component comprises two sets of cells () disposed in respective superposed layers (). Each cell () contains an optically active material, and the cells in each set are isolated from one another by separating portions () within the corresponding layer. The cells () of one layer are offset relative to the cells of the other layer so as to be located in line with the separating portions () pertaining to the other layer. Such optical component exhibits transparency that is improved compared with components having a single layer of cells or cells that are superposed.

Optically transparent component with two sets of cells

Growing community of inventors

Orsay, France

Pierre Chavel