Polight Asa

Polight as

Varioptic S.a.

Nicolas Tallaron

Pierre Craen

Vladimir Kartashov

Lars Henriksen

Janne Tapani Kilpinen

Tore Svortdal

John Phair

David Perennez

Jacques Dumarest

Manu Hakola

Thi Kim Trinh Tran

Muhammad Asif Raza Azhar

Euan Barron

Antoine Robert Marie Dalod

Alain Gillet

The invention relates to a controllable optical assembly such as a controllable lens or a controllable beam deflector. The optical assembly comprises first and second cover members, wherein one of them is transparent while the other is transparent or reflective. A transparent, deformable, non-fluid body is sandwiched between the first and second cover members so that the first and second cover members and non-fluid body constitute a lens or a light deflector. Actuators are arranged to generate a controllable bending and/or tilt of the first and/or the second cover member dependent on a control signal. One or more sensors are provided to generate a measurement signal indicative of the bending or tilt of the first and/or the second cover member. The control signal is determined based on the measurement signal.

Sensor based control of an optical device with a variable optical power or a variable beam deflection

The invention relates to a method for determining a set-point voltage for a piezoelectric actuator system to achieve a desired optical response of the piezoelectric actuator system, such as an optical power. The method is based on a mathematical model, OP(V,T,n) describing a relationship between the applied voltage and the optical response. Calibration and use of the model involves determining a transition time count value. During use, e.g. at given intervals, the model is updated based on actual values of the temperature and the transition time count value. The set-point voltage required to achieve a desired optical response is determined based on the updated model and the set-point voltage is applied to the piezoelectric actuator.

Feedforward determination of a driving signal for a piezo actuator

The invention relates to an optical assembly for use with compact camera modules. The optical assembly comprises a transparent optical element, an optical reflection surface arranged to deflect a light through the optical element, a transparent elastic non-fluid body and an actuator system comprising one or more actuators and an actuator-component arranged to undergo bending and/or displacement by the one or more actuators. The non-fluid body may be sandwiched between the actuator-component and the optical element so that the shape or orientation of the actuator component and the non-fluid body can be changed by actuation of the actuators to provide adjustable optical power or beam deflection.

Optical device with a light ray deflector

The invention relates to a method and an actuator system for determining and applying a voltage to a piezoelectric actuator (PEA) to achieve a given setpoint displacement. The method involves determining a relation d(V) between a PEA displacement measure (d) and voltage (V) and a relation tt(V) between transition time (tt) and voltage and combining the determined relations to calculate a relation d(tt) between the displacement measure and transition time during an initial calibration procedure. This relation is characteristic for the PEA, and by determining a new relation tt(V) after repeated biasing of the PEA, a compensated relation d(V) can be calculated by substituting tt(V) in the calculated d(tt). The compensated relation d(V) compensates for piezo creep effects due to the wear and can be used to determine the voltage to be applied directly, or be used in other compensation algorithms.

Determining and applying a voltage to a piezoelectric actuator

The invention relates to a tunable lens where the optical power can be adjusted. The lens consists of a deformable, non-fluid lens body sandwiched between a thin, flexible membrane and transparent back window, and an actuator system serving to change the overall shape of the membrane and lens body. The membrane is pre-shaped to have a Sag or Sagittal of at least 10 &#x3bc;m so that the lens has a non-zero optical power when the actuator system is not activated. In order to achieve a large optical power range for the lens, the membrane should preferably be made of a material having a Young's modulus in the range 2-1.000 MPa.

Adaptive lens

The invention relates to an adjustable or tuneable lens assembly where a deformable, non-fluid lens body is sandwiched between a bendable lens cover and a back window to form a lens. The lens assembly has an actuator system with a plurality of individually addressable actuators for applying force to the lens cover in direction along the optical axis to change an overall shape of the lens. The actuator system has a focus adjustment mode to adjust the optical power of the lens and an optical image stabilisation mode, which are configured to operate simultaneously by addressing each actuator to apply a force being at least substantially a sum of the forces that would be applied in these modes.

Lens assembly for optical image stabilization and focus adjustment

The invention relates to post-processing of a digital photo to correct perspective distortion in the photo. The correction applies a digital photo of a scene and a depth map associated with the photo and comprising, for each pixel in the photo, a depth being a distance between a part of the scene in that pixel and a position of the camera at the time of acquisition. The correction is performed locally, so that the correction of any pixel in the photo depends on the depth of that pixel. The correction can be implemented as a transformation of each pixel in the original photo into a new position in a corrected photo. Afterwards, pixel values has to be calculated for the pixels in the corrected photo using the original pixel values and their new positions. The invention is particularly relevant for photos where objects or scenes involves a large magnification variation, such as selfies, close up photos, and photos when the extension of a large, object is not orthogonal to the optical axis of the camera (low/high angle shots).

Depth map based perspective correction in digital photos

There is presented a transparent optical device element () comprising an optical lens (), comprising one or more piezoelectric actuators (), wherein said optical lens () comprises an optical aperture (), and wherein the optical device element furthermore comprises a passivation layer () placed on said optical lens, said passivation layer comprising a barrier layer () forming a humidity barrier, and being located on at least a portion of said cover member, where said portion of said cover member is intersected by the optical axis, and on said piezoelectric actuators, and wherein the passivation layer furthermore comprises one or more further layers () located on at least said portion of said cover member being intersected by the optical axis, wherein said passivation layer forms an anti-reflection coating for said optical lens () at least along the optical axis ().

Piezoelectrically actuated optical lens

The invention concerns A housing for a variable focus liquid lens () containing first and second immiscible liquids defining a liquid-liquid interface moveable by electrowetting by application of a voltage between first and second electrodes () of the liquid lens, the housing comprising: a first portion () comprising a contact surface for contact with a circuit board (); a second portion () for receiving the liquid lens, the second portion arranged to be moveable with respect to said first portion in a first direction parallel to an optical axis (&#x394;) of the liquid lens when said liquid lens is positioned in said housing; and first and second contacts () for electrically coupling the circuit board to the first and second electrodes respectively of the liquid lens when said liquid lens is positioned in said housing, wherein each of the first and second contacts comprises a first conductive surface () arranged to make contact with a second conductive surface (), said first and second conductive surfaces slidable with respect to each other in said first direction, so that the circuit board can be coupled to the first and second electrodes.

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Lyons, France

Nicolas Tallaron