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Orientation independent coma compensating liquid lens

IP.com Disclosure Number: IPCOM000257845D
Publication Date: 2019-Mar-14
Document File: 52 page(s) / 1M

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention relates to a lens (1), comprising: a first chamber (C1) filled with a first transparent liquid (L1) comprising a first mass density (ρ1) and a first refractive index (n1), a second chamber (C2) filled with a second transparent liquid (L2) comprising a second mass density (ρ2) and a second refractive index (n2), and a transparent and elastically deformable first membrane (12) that separates the two chambers (C1, C2) from one another and contacts the first liquid (L1) and the second liquid (L2), wherein said mass densities (ρ1, ρ2) and said refractive indices (n1, n2) are selected such that a gravity-induced coma aberration of the lens (1) is reduced or prevented.

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This is the abbreviated version, containing approximately 4% of the total text.

opt153ep-2

1

Orientation independent coma compensating liquid lens

Specification

The present invention relates to a liquid lens. 5

Particularly, it is an objective of the present invention to solve the problem of gravity

coma of liquid lenses, i.e. to provide reduction of spherical aberrations.

Gravity-induced vertical coma aberration (herein also denoted as gravity coma) is

caused by a hydrostatic pressure differential that results into a non-rotationally

symmetric membrane shape. In other words, the weight of the liquid in the lens 10

makes the membrane deformation at the bottom of the lens to be somewhat higher

than at the top.

For example, as shown in Fig. 1, at cross section A the optical path (lens thickness)

is smaller than in cross section B. The resulting local deflection / optical power at

different positions that are at the same distance from the container are different 15

across the liquid lens inducing optical aberrations. So far, cf. e.g. Fig. 2, gravity coma

is compensated with a rigid non-adjustable coma plate. This however works only for

one fixed orientation and a specific membrane deflection.

Therefore, it is an objective of the present invention to provide an improved lens for

reducing gravity coma. 20

This problem is solved by a lens according to claim 1. Preferred embodiments of the

lens according to the present invention are stated in the sub claims and are

described below.

According to claim 1, a lens is disclosed, comprising:

- a first chamber filled with a first transparent liquid comprising a first mass 25

density and a first refractive index,

- a second chamber filled with a second transparent liquid comprising a second

mass density and a second refractive index, and

- a transparent and elastically deformable first membrane that separates the

two chambers from one another and contacts the first liquid and the second 30

opt153ep-2

2

liquid, wherein said mass densities and said refractive indices are selected such

that a gravity-induced coma aberration of the lens is reduced or prevented.

Particularly, in an embodiment, when an optical axis of the lens is in a horizontal

position, the first membrane forms on a surface facing the first liquid at least a

convex section and at least a concave section so as to reduce or prevent said 5

gravity-induced coma aberration of the lens.

Further, according to an embodiment of the present invention, the mass densities

and the refractive indices are selected such that the gravity induced coma aberration

of the lens is reduced or prevented independent of an orientation of the optical axis of

the lens. 10

Furthermore, according to an embodiment, the first mass density is smaller than the

second mass density, and the first refractive index is larger than the second

refractive index.

Furthermore, according to an alternative embodiment, the first mass density is larger

than the second mass density, and the first refractive index is smaller than the 15

second refractive index.

Further, a...

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