摘要:
A variable focus lens comprising a first fluid (A) and a second, non-miscible, fluid (B) in contact over a meniscus. A first electrode (2) separated from the fluid bodies by a fluid contact layer (10), and a second electrode (12) in contact with the first fluid to cause an electrowetting effect whereby the shape of the meniscus is altered. The fluid contact layer has a substantially cylindrical inner wall.
摘要:
The invention relates to an optical system comprising a fluid chamber 1 and a birefringent part. The fluid chamber comprises first and second fluids 10, 12 having different indices of refraction, the interface between the fluids forming a meniscus 14. The birefringent part is capable of varying characteristics of a first radiation beam 3b and a second radiation beam 3c, the first and second radiation beams having different polarisations. Variation in the configuration of the meniscus causes variation in the characteristics of the first radiation beam and the second radiation beam. Variation in the configuration of the meniscus may be controlled by electrowetting.
摘要:
An optical scanning device which is compatible with both multi-layer and single layer disc formats, and which alleviates lens design requirements by providing a dual lens system and by making, say, lens OL0 compatible with DVD (as well as layer L0 of the dual layer format) and lens OL1 compatible with CD (as well as layer L1 of the dual layer format). Thus the two lens designs only need to work at two different wavelengths, and the device achieves compatibility with three different optical record carrier formats, but the amount of spherical aberration in respect of each lens part only needs to be matched precisely with respect to two formats in one of a number of known ways.
摘要:
The present invention discloses an optical device comprising a container enclosing an insulating liquid (A) and an electrically susceptible liquid (B), the insulating liquid (A) and the electrically susceptible liquid (B) being immiscible and being in contact with each other via an interface (14), at least one of the liquids (A; B) being at least partially placed in a light path through the container. The optical device further comprises heating means (2, 12, 20) that preferably are responsive to a temperature sensor (30) for heating the insulating liquid (A) and the electrically susceptible liquid (B). Consequently, an optical device is obtained in which the influence of the temperature dependence of the physical properties of the insulating liquid (A) and the electrically susceptible liquid (B) on the behaviour of the optical device is reduced, thus yielding an optical device with improved optical characteristics at low temperatures.
摘要:
In an image sensor incorporating a variable focus lens of the electrowetting type, means are provided for reducing or substantially eliminating the occurrence of ghost images. A variable focus lens of the above-mentioned type comprises a housing (5) provided with a first fluid (A) and an axially displaced second fluid (B), the two fluids being non-miscible, in contact over a meniscus (14) and having different indices of refraction. First and second electrodes (2,12) are provided and the shape of the meniscus (14) is controllable in dependence on the application of a voltage between the first and second electrodes (2,12). Various methods of reducing or substantially eliminating the occurrence of ghost images are prepared, including the alteration of the optical properties of an inner and/or outer wall of the housing (5), to reduce the reflectivity thereof, provision of means in the image sensor to intercept ghosting and appropriate selection of the material or combination of materials of which the housing (5) is formed.
摘要:
An achromatic electrowetting lens is provided. This is achieved by a particular choice of the parameters n, n2, V, and V2, wherein n is the refractive index and V is the Abbe number. By fulfilling the relations: Formula (I) an achromatization of the electrowetting lens is achieved.
摘要:
A light control element (100) is disclosed having a first chamber (110) encapsulating a first liquid crystal based light absorbing material (112; 114) being switchable from a first orientation in which said material (112; 114) predominantly absorbs light having a first polarization direction to a second orientation in which said material (112; 114) is substantially transparent and that further has a second chamber (120) encapsulating a second liquid crystal based light absorbing material (122; 124) being switchable from a first further orientation in which said material (122; 124) predominantly absorbs light having a polarization direction substantially perpendicular to the first polarization direction to a second further orientation in which said material (122; 124) is substantially transparent. A plurality of electrodes is present for switching the orientations of the first and second light absorbing materials. Consequently, a polarization independent light control element (100) is obtained.
摘要:
Motor, comprising a first body (3) and second body (5), the latter being movably mounted with respect to the first body. A chamber (4), sandwiched between surfaces of said bodies, is filled with a non-polar and/or non-conductive first fluid (6) and at least one volume of a polar and/or conductive second fluid (7), which fluids are immiscible. One of said surfaces is provided with means (10) for locally varying the wettability of said surface by the second fluid, to move the or each volume of second fluid along a desired path. The other surface is provided with means (9, 14, 15) for coupling the or each volume of second fluid to this surface, so that this surface will be dragged along by the moving volume or volumes. This results in a relative movement between both surfaces and hence in a movement of the second body.
摘要:
An electrowetting device comprises a variable element (28) and a control system (11) for the variable element (28), wherein the control system (11) is adapted to provide an asymmetric voltage waveform to the variable.
摘要:
A variable lens (100; 200; 220; 240; 250; 300; 350) comprises a chamber (125), with an optical axis (90) extending through the chamber (125). The chamber (125) contains a first fluid (130) and a second fluid (140) in contact over a meniscus (150)>extending transverse the optical axis (90). The perimeter of the meniscus (150) is fixedly located on an internal surface (120) of the chamber (125). The fluids (130, 140) are substantially immiscible and have different indices of refraction. A pump (110) is arranged to controllably alter the shape of the meniscus (150) by altering the relative volume of each of the fluids (130, 140) contained within the chamber (125).