Polight As

Polight Asa

Lars Henriksen

Vladimir Kartashov

Wilfred Edwin Booij

Ib-Rune Johansen

Dag Thorstein Wang

Nicolas Tallaron

Karl Henrik Haugholt

Frode Tyholdt

Jon Herman Ulvensøen

Morten Eliassen

Pierre Craen

Janne Tapani Kilpinen

Thomas Spatscheck

Jon Herman Ulvensoen

Tore Svortdal

Thi Kim Trinh Tran

Muhammad Asif Raza Azhar

Euan Barron

Antoine Robert Marie Dalod

Dag Torstein Wang

Johansen Ib-Rune

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 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

There is presented an optical element, such as a tuneable lens, wherein there is provided meansto mitigate problems with stress concentration in a bendable cover memberat a border of a supporting structure, which in the absence of said means would entail a stress singularity issue due to an abrupt change in mechanical properties around the bendable cover member

Optical element with stress distributing supporting structure

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 present invention relates to transparent optical device elements comprising a deformable lens body and to a method for changing the refractive index (RI) of a deformable lens body. The deformable lens body of the invention has an improved mechanical stability, a high refractive index, an optimal degree of stiffness and sheer modulus for use as optical lens.

Transparent optical device element

The present invention provides method steps for manufacturing an assembly of adjustable lenses on a wafer. The method steps provide an easy manufacturing of such lenses, minimizing the cost of assembly, and at the same time provide a solution for mass production of compact adjustable lenses for use in mobile phones, etc.

Method for manufacturing adjustable lens

The present invention is generally related to the field of optical systems and/or lens attachments, and more specific to an optical system and/or lens attachment providing a switchable Optical Power Switch (OPS) controllably switchable between different states. A soft transparent material (), for example silicone-gel is disposed onto a surface of a glass plate (). The glass plate () can be moved with actuators towards a surface of a lens body (). When the soft material element () is in contact with the surface of the lens body (), this surface changes its optical feature.

Optical power switch (OPS)

The present invention is related to a lens assembly comprising a flexible lens body () inside a cavity bounded by a sidewall () and a first transparent cover (), and a second transparent cover (), wherein both covers () are in contact with respective surfaces of the lens body (). Piezo electric elements () shapes the lens body () when activated, thereby adjusting the focal length of the lens assembly.

Flexible lens assembly with variable focal length

The present invention provides thermal compensation for a lens assembly comprising a polymer lens body. Polymers do have different thermal expansion coefficients which makes it necessary to compensate for thermal expansions to keep optical characteristics of such lenses within specifications when used under different environmental conditions. Also, it is necessary to provide thermal compensation during manufacturing of such lenses due to high temperatures during manufacturing steps.

Method and arrangement for reducing thermal effects in compact adjustable optical lenses

The present invention provides a solution for designing a compact adjustable lens assembly, wherein a circular shaped piezoelectric crystal is bending a thin glass cover, thereby providing a shift of focal length of the lens assembly.

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Tønsberg, Norway

Lars Henriksen