Drive unit with at least two oscillating arms

A drive unit for driving a passive element relative to an active element, wherein the active element comprises:

• a resonator and at least one excitation means for exciting oscillations in the resonator,
• the resonator comprising at least two arms extending from a connection region of the resonator at a same side of the connection region,
• the resonator and the at least two arms extending in parallel to a reference plane,
• each of the at least two arms comprising, at an outer end of the arm, a contact element,
• the contact elements being movable via oscillating movements of the at least two arms,
• the passive element being arranged to be driven and moved relative to the active element via the oscillating movements;
• the passive element comprises contact areas, each contact area being arranged to be in contact with a respective one of the contact elements;
• wherein
• each of the at least two arms comprises, at an outer end of the arm, a protrusion extending in a first direction, the first direction being inward, toward an other arm or outward, away from the other arm, and
• on at least one of the at least two arms, the respective contact element arranged at the at least one arm outer end extends in a second direction, the second direction being opposite to the first direction;
• wherein a first arm of the at least two arms comprises, in a section opposite to the outer end, a first further contact element extending outward, away from a second arm of the at least two arms,
• and the second arm comprises, in a section opposite to the outer end, a second further contact element, extending outward, away from the first arm.

A drive unit for driving a passive element relative to an active element, wherein the active element comprises:

• a resonator and at least one excitation means for exciting oscillations in the resonator,
• the resonator comprising a first pair of arms extending from a connection region of the resonator at a same side of the connection region,
• the resonator and the first pair of arms extending in parallel to a reference plane,
• each of the first pair of arms comprising, at an outer end of the arm, a contact element,
• the contact elements being movable via oscillating movements of the first pair of arms,
• the passive element being arranged to be driven and moved relative to the active element by way of these oscillating movements;
• the passive element comprises contact areas, each contact area being arranged to be in contact with a respective one of the contact elements;
• wherein
• the resonator comprises a second pair of arms extending from the connection region of the resonator in the opposite direction as the first pair of arms.

A drive unit for driving a passive element relative to an active element, wherein the active element comprises:

• a resonator and at least one excitation means for exciting oscillations in the resonator,
• the resonator comprising at least two arms extending from a connection region of the resonator at a same side of the connection region,
• the resonator and the at least two arms extending in parallel to a reference plane,
• each of the at least two arms comprising, at an outer end of the arm, a contact element, the contact elements facing outward, away from the other arm,
• the contact elements being movable via oscillating movements of the at least two arms,
• the passive element being arranged to be driven and moved relative to the active element via said oscillating movements;
• the passive element comprises contact areas, each contact area being arranged to be in contact with a respective one of the contact elements;
• wherein the resonator is shaped from a flat piece of material,
• wherein
• between each of the at least two arms and the connection region there is an attachment necking;
• wherein each of the at least two arms, from the attachment necking comprises an active section that extends in a first direction parallel to a resonator axis towards the respective outer end with the respective contact element, and a counterweight section, that extends in a second direction opposite to the first direction;
• wherein for each of the at least two arms, a stiffness of the arm, with respect to rotation around an axis normal to the reference plane, in the counterweight section and in the active section where the arm is joined to the counterweight section is smaller than in the attachment necking.

A drive unit for driving a passive element relative to an active element, wherein the active element comprises:

• a resonator and at least one excitation means for exciting oscillations in the resonator,
• the resonator comprising at least two arms extending from a connection region of the resonator at a same side of the connection region,
• the resonator and the at least two arms extending in parallel to a reference plane,
• each of the at least two arms comprising, at an outer end of the arm, a contact element,
• the contact elements being movable via oscillating movements of the at least two arms,
• the passive elements being arranged to be driven and moved relative to the active element by said oscillating movements;
• the passive element comprises contact areas, each contact area being arranged to be in contact with a respective one of the contact elements;
• wherein the resonator is shaped from a flat piece of material,
• wherein
• in regions covered by the at least one excitation means for exciting oscillations, the resonator comprises holes or openings.