Optical arrangement and method for setting an optical component mounted with a mount into a periodic linear oscillation

Abstract

The invention relates to an arrangement for periodically moving an optical component.

Description

Technical FieldThe invention relates to an arrangement for periodically moving an optical component.Prior ArtFrom JP2003315656 A, a mobile phone with camera is known in which the focus lens of the camera is vibrated by an eccentric to realize a vibration function for notifying the operator, thereby not requiring an additional vibration unit.JPH07-162732 A discloses an autofocus for a camera having a lens oscillating at 30 Hz, in which the direction of the focus position is determined by means of the oscillating lens. Disadvantages are the binding of the oscillation frequency to the field frequency of the frame rate and the relatively high energy consumption of the oscillation excitation.DE 2648419 A1 discloses a checking device for checking the position of the image plane of an objective, in which a lens is set into oscillation by means of an oscillating plate. It is disadvantageous that the lens is moved on a curved path and, in addition, the lens can be tilted with respect to the optical axis. Therefore, this system can only achieve small amplitudes of oscillation without compromising the optical quality of the image.DE 10 2017 214 474 A1 discloses an actuator with an inherent position sensor, in which a lens is to be brought to a focus position. The control bandwidth of the actuator is selected to be substantially larger than the mechanical resonant frequency of the spring-mass system in order to bring about a rapid autofocus process. A disadvantage is the relatively high energy consumption of the drive.U.S. Pat. No. 2021 0 149 170 A1 discloses a method for accommodating a z stack.Object of the InventionIt is an object of the invention to provide an optical arrangement and a method for setting an optical component held with a holder into a periodic linear oscillation. A low energy consumption and an improved efficiency are sought.Solution of the ProblemThe object is achieved by an optical arrangement according to claim 1 and a method according to claim 10.Advantages of the InventionThe advantage of the invention is a better energy efficiency of the optical arrangement and the possibility of being able to record image sequences in different object planes quickly. Due to improved energy efficiency, the optical arrangement can be compact in design, resource-saving in production and durable in operation.DESCRIPTION OF THE INVENTIONAn optical arrangement according to the invention together with the method according to the invention is described below.The optical arrangement according to the invention comprises• a support• an optical component held with a holder, in particular wherein the optical component comprises at least one of the following elements:◯ a plane mirror,◯ a curved mirror,◯ an optical lens,◯ an optical lens group,◯ a light source◯ an image sensor• at least one electrically operable linear drive element having an oscillating element and a stator, and• at least one return spring.In the optical arrangement according to the invention• The stator is mechanically connected to the support,• The mount is mechanically connected to the oscillating element,• The oscillating element is mounted such that it can be displaced with respect to the stator in a direction of movement,• The linear drive element is provided to set the mount with the optical component in a linear oscillation in the direction of movement,• The restoring spring is provided to provide a restoring force between the oscillating element and the stator.In addition, the optical arrangement has a resonant frequency f r. The linear drive element can be operated in such a way that the mechanical oscillation has an oscillation frequency f which corresponds to the resonant frequency f r. The optical component can thus be moved periodically. Resonant operation may have the advantage that less drive energy is required than in non-resonant operation. As a result, the drive element can be dimensioned smaller. In addition, in the case where the optical arrangement is implemented in a hand-held device, a smaller accumulator can be used.The optical component held in the holder can have an optical axis which runs, for example, in a direction z. In order to hold the optical component, the mount can be of annular configuration. It is likewise possible for the optical component to be gripped with the mount only on one side. This can be understood to mean that the optical component is in mechanical contact with the mount only at one or more points, without the mount enclosing the component.The carrier can be designed, for example, as an optical bank, a base plate or a housing.The electrically operable linear drive element can drive a movement of the mount in a direction z. The direction z may be the direction of movement of the linear vibration of the mount. The linear drive element can comprise a ferromagnetic element and a magnetic coil which exerts a force on the ferromagnetic element as a function of an electrical current. The magnet coil can be designed as a stator, i.e. be firmly connected to the carrier, and the ferromagnetic element can represent the oscillating element. Alternatively, the magnetic coil can represent the oscillating element and the ferromagnetic element the stator.The restoring spring can also be referred to as a restoring spring arrangement. The restoring spring can advantageously be designed as a helical spring. This can be the least expensive solution. However, the restoring spring can be fatigued as a result of the mechanical stress. Likewise advantageously, the restoring spring can be designed as a magnet arrangement comprising a first permanent-magnetic element and a second permanent-magnetic element. This can have the advantage that no mechanical stress is present. In this case, there can be a repulsive magnetic coupling between the first permanent magnetic element and the second permanent magnetic element. This can be effected in that a pole of the same type, for example likewise the north pole, of the first permanent magnetic element is situated opposite a pole, for example the north pole, of the second permanent magnetic element at a specific distance. As a result, a first repulsive force can be generated, for example in the direction z, the height of which can decrease with increasing distance. The restoring spring can also comprise a third permanent-magnetic element. In this case, the other magnetic pole, for example the south pole, of the second permanent magnetic element can be opposed by a similar pole, that is to say for example likewise the south pole, of the third permanent magnetic element at a second distance, as a result of which a second repulsive force, for example in the direction -z, is formed between the second and third permanent magnetic elements. For this purpose, the permanent magnetic elements can be magnetized in the z-direction. The first and third permanent magnetic elements may be connected to the carrier, while the second permanent magnetic element may be connected to the socket. Since the first and second repulsive forces are opposed and depend on the respective distances of the permanent magnetic members, the first to third permanent magnetic members constitute a return spring without mechanical contact. The second permanent magnetic element can be connected to the oscillating element or can be identical thereto. The second permanent magnetic element can thus simultaneously function as a vibration element in the latter case. As a permanent magnet, it can likewise represent a ferromagnetic element which, in cooperation with the magnet coil, can apply a force in a direction of movement.The first permanent-magnetic element and the third permanent-magnetic element can be embodied as ring magnets. As a result, the driving force of the linear drive element can be transmitted to the mount on the coil axis. For this purpose, a fixed mechanical connection can be provided between the linear drive element and the mount.The optical arrangement can advantageously have an attenuation with an attenuation degree D, wherein the quality factor Q=1 / (2*D) is between 5 and 10000, in particular between 10 and 1000, in particular between 20 and 100. The damping can be effected, for example, by frictional forces of the linear guide. It is also possible to additionally use a shock absorber to effect a defined damping. It is also possible to provide an ohmic resistor parallel to the magnetic coil in order to effect a defined attenuation of the oscillation of the optical arrangement.In this case, the oscillation of the optical arrangement can bring about a time-dependent force on the carrier. This may be unfavourable. In order to compensate for this force on the carrier, the optical arrangement can also comprise a compensation arrangement which can be set into an opposite oscillation in order to generate an opposite time-dependent force on the carrier. Ideally, the carrier can thereby be free of forces.The arrangement can advantageously comprise at least one sensor; in particular, the sensor can have a magnetic field sensor, a coil, a position sensor or a light barrier or can be designed as such. The sensor can be provided to ascertain a position of the optical component and / or a speed of the optical component. For this purpose, the sensor can detect the position or speed of the oscillating element or the mount with respect to the carrier. It is also possible for the sensor to detect the position or speed of the optical component. The sensor signal can be used to synchronize the periodic electrical energy for operating the linear drive element with the oscillation of the optical component. For this purpose, the sensor signal can be amplified and, if necessary, used in a phase-shifted manner for controlling the electrical drive energy of the linear element. The sensor signal can also be used to determine the recording times for image recordings. For this purpose, for example, an image recording can be triggered at specific positions of the optical component. It can be particularly advantageous if a first sensor is used to control the oscillation. A second sensor, in particular a position sensor, can then be used to trigger an action, for example an image recording, at specific positions of the optical component. It is also advantageously possible that only one sensor is used equally for both tasks.The optical arrangement can advantageously also have a control unit and the arrangement with the control unit can form a control loop, with which the oscillation frequency f can be regulated to the resonance frequency f r. For this purpose, the sensor signal can be supplied to the control unit. For this purpose, a controlled system with electrical feedback can be formed.The optical arrangement can advantageously comprise at least one linear guide. This can be formed, for example, as a dovetail guide or as a roller bearing. The linear guide can be configured to be movable in the direction z.Advantageously, the oscillation element can have an amplitude of 1 mm to 20 mm, in particular 2 mm to 10 mm, measured from the smallest to the largest deflection value (peak-to-peak value), and / or a resonance frequency f r between 5 Hz and 60 Hz, in particular between 7.5 Hz and 30 Hz.Advantageously, the linear drive element can comprise a coil. Advantageously, a capacitor can be connected in parallel with the coil, which can serve to tune an electrical resonant frequency to a mechanical resonant frequency of the optical arrangement.The optical arrangement can advantageously be used for periodically adjusting a focus position of the optical component.Furthermore, a method for setting an optical component held with a holder into a periodic linear oscillation is specified, comprising the following steps:• providing a periodic electric drive signal having a plurality of periods,• supplying the periodic electric drive signal to an electrically operable linear drive element, the linear drive element causing a drive force to the mount, wherein a position of the mount relative to a carrier periodically changes,• Application of a restoring force, which is dependent on the position of the mount, by means of a restoring spring,• continuously recording a measured value of the position of the holder and / or of the instantaneous speed of the holder by means of a first sensor,• supplying the measured value to a control unit,• regulating the periodic electric drive signal to a resonant frequency of the optical arrangement by means of the control unit.Advantageously, the oscillation of the optical component can be a sinusoidal oscillation. A sinusoidal oscillation can be produced in a simple manner by means of the linear drive element if an electrical drive signal of the same frequency, which is phase-shifted with respect to the oscillation of the optical component, is provided, for example, by an electrical resonant circuit.Alternatively, an optimized vibration shape of the optical component can be advantageous, the temporal profile of which lies between a sinusoidal vibration and a triangular vibration of the same amplitude. For this purpose, a pure sinusoidal oscillation and a pure triangular oscillation can be used, which have the same frequency, the same phase and the same amplitude as the oscillation of the optical component. In a region between a zero crossing and a maximum value of the oscillation of the optical component, the pure sinusoidal oscillation can represent an upper limit and the pure triangular oscillation can represent a lower limit of the oscillation of the component.Advantageously, the method according to claim may further comprise:• imaging an object onto an image sensor by means of the optical component, wherein a respective object-side plane is imaged sharply onto the image sensor as a function of the position of the mount,• Continuous recording of in each case a plurality of images at different positions of the mount by means of the image sensor.Advantageously, during the continuous recording of the images, an image recording of the object can be triggered at a specific position of the holder. For this purpose, a second sensor can be provided. This can be designed as a clock generator which triggers an image recording at the predetermined positions of the holder. This sensor may be identical to the first sensor, but need not be identical. This sensor can then be used both for detecting the measured value for the control unit for regulating the periodic drive signal and for triggering the image recordings. However, it may also be advantageous to use two separate sensors. The latter may be more complicated, but may bring about better accuracy of the image recording positions.Advantageously, the method may further comprise:• forming a z-stack from a plurality of the recorded images of a period• Producing a two-dimensional image of increased depth of field from the z stack and / or producing a three-dimensional model of the object from the z stack.Advantageously, the method may further comprise:• Producing a two-dimensional or three-dimensional video from a plurality of two-dimensional images or three-dimensional models produced one after the other.The figures show the following: FIG. 1 shows a principle of an optical arrangement. FIG. 2 shows a first exemplary embodiment. FIG. 3 shows a principle of an optical arrangement with compensated bearing force. FIG. 4 shows a second exemplary embodiment. FIG. 5 shows an embodiment of control of the vibration of the optical assembly. FIG. 6 shows waveforms of the optical assembly. FIG. 7 shows a solenoid with a parallel capacitor. FIG. 8 shows two magnet coils with a parallel capacitor. FIG. 9 shows a third exemplary embodiment of an optical arrangement. FIG. 10 shows a fourth exemplary embodiment of an optical arrangement. FIG. 11 shows a fifth exemplary embodiment of an optical arrangement.Exemplary EmbodimentsThe invention is explained below using exemplary embodiments.FIG. 1 shows a principle of an optical arrangement. The optical arrangement 1 comprises a carrier 7. In the schematic illustration in FIG. 1, the function of the carrier 7 as a fixed bearing for one end of the restoring spring 16 is illustrated. At the other end of the restoring spring, the time-dependent driving force F d( t) acts with the reference symbol 9. The oscillating element 13 is guided displaceably in the direction z by means of a linear guide 6. The oscillating element 13 is connected to the mount 5, so that the latter can likewise be displaced in the direction z together with the optical component 2. The summed mass of the oscillating element 13, the mount 5 and the optical component 2 can form a mechanical oscillating system in cooperation with the spring constant of the restoring spring 16. The carrier 7 acting as a fixed bearing must absorb the bearing force F g( t) at the supported end of the restoring spring.FIG. 2 shows a first exemplary embodiment. In the first exemplary embodiment according to FIG. 2, this is shown as a base plate. The return spring 16 is designed as a contactless magnetic spring. For this purpose, a first permanent-magnetic element 18 is provided, which is arranged in a magnetic coupling 22 with a second permanent-magnetic element 19. Mutually opposite, similar magnetic poles, between which a first repulsive force is formed, are here shown in each case equally filled in black. In addition, the other magnetic pole, not shown in solid form, of the second permanent magnetic element 19 is opposed by a similar pole of a third permanent magnetic element 20, as a result of which a second repulsive force is formed between the second 19 and third permanent magnetic elements 20. Since the first and second repulsive forces are opposed and depend on the respective distances of the permanent magnetic members, the first to third permanent magnetic members 18, 19, 20 form a return spring 16 without mechanical contact. In this example, the second permanent magnetic element 19 simultaneously has the function of a vibrating element 13. as a permanent magnet it likewise represents a ferromagnetic element 10 which, in cooperation with the magnet coil 11, can apply a force in a direction of movement 14. The magnet coil is provided here as a stator 15, i.e. is firmly connected to the carrier 7. Likewise, the first and third permanent magnetic elements 18, 20 are fixedly connected to the carrier. The electrically operable linear drive element 8 comprises the magnetic coil 11 and the ferromagnetic element 10. As a result, the driving force 9 of the linear drive element 8 can be transmitted to the mount 5 on the coil axis 12. For this purpose, a fixed mechanical connection, for example a push rod, is provided here. In addition, an optical component 2 with an optical axis 4 is provided, which is held with the mount 5. In particular, the optical component 2 can comprise at least one of the following elements:• a plane mirror• a curved mirror• an optical lens• an optical lens group,• a light source• an image sensorThe oscillating element 13 is mounted so as to be displaceable relative to the stator 15 in a direction of movement 14. For this purpose, a linear guide 6 is provided.The linear drive element 8 is provided to set the mount 5 with the optical component 2 into a linear oscillation in the direction of movement 14.The restoring spring 16 is provided to provide a restoring force between the oscillating element 13 and the stator 15 in order to form a mechanically oscillatable system.The optical arrangement 1 has a resonant frequency f r. The linear drive element 8 can be operated in such a way that the mechanical oscillation into which the optical arrangement is placed has an oscillation frequency f which corresponds to the resonant frequency f r.Advantageously, the optical arrangement 1 can have an attenuation with an attenuation degree D, wherein the quality factor Q=1 / (2*D) is between 5 and 10000, in particular between 10 and 1000, in particular between 20 and 100. The damping can be effected, for example, by frictional forces of the linear guide. It is also possible to additionally use a shock absorber to effect a defined damping.Optionally, the arrangement can advantageously comprise at least one sensor 26, 27, In particular, the sensor can have a magnetic field sensor, a coil, a position sensor or a light barrier or can be designed as such. The sensor can be provided to ascertain a position of the optical component 2 and / or a speed of the optical component. For this purpose, the sensor can detect the position or speed of the oscillating element 13 or the mount 5 with respect to the carrier 7. In the illustration, the first sensor 26 and the second sensor 27 are mechanically connected to the carrier 7. It is also possible for the sensor to detect the position or speed of the optical component 5 when it is mounted at a suitable location. The sensor signal can be used to synchronize the periodic electrical energy for operating the linear drive element 8 with the oscillation of the optical component 2. For this purpose, the sensor signal can be amplified and, if necessary, used phase-shifted for controlling the electrical drive energy of the linear drive element 8.In a variation of all exemplary embodiments which is not illustrated in the drawing, the linear drive element 8 is designed in such a way that a ferromagnetic element 10 forms the stator 15, i.e. is firmly connected to the carrier 7, while the coil 11 represents the oscillating element 13, i.e. is mechanically connected to the mount 5.In the further exemplary embodiments, the reference numerals introduced here correspondingly continue to apply.FIG. 3 shows a principle of an optical arrangement with compensated bearing force. Here, a compensation of the force on the bearing 7 is provided. The compensation arrangement 24 comprises a compensation return spring 16 a, a compensation oscillating element 13 a, a compensation magnetic coil 15 a, a compensation linear guide 6 aand a compensating mass 25, The compensating mass is set in opposite direction to the mount 5 by means of a further linear drive element 13 a, 15 a) in opposite phase oscillation to the oscillation of the optical component by means of a compensation drive force F k( t), in order to obtain a resulting bearing force F g( t)=0.FIG. 4 shows a second exemplary embodiment. In this example, the optical arrangement 1 is shown with the compensation arrangement 24. The compensating mass 25 is selected here such that it corresponds to the sum of the masses of the mount and of the optical component 5. The compensation spring 18 a, 19 a, 20 ais selected to be similar to the restoring spring 18, 19, 20, as explained above with reference to FIG. 2. A first permanent-magnetic compensation element 18 ais provided as the compensation return spring, which is arranged in a magnetic coupling 22 with a second permanent-magnetic compensation element 19 a. Mutually opposite, similar magnetic poles, between which a first repulsive force is formed, are here shown in each case equally filled in black.In addition, the other magnetic pole, not shown in solid form, of the second permanent-magnetic compensation element 19 ais opposed by a similar pole of a third permanent-magnetic compensation element 20 a, as a result of which a second repulsive force is formed between the second 19 aand third permanent-magnetic compensation element 20 a.FIG. 5 shows an embodiment of control of the vibration of the optical assembly. The optical arrangement here has a control unit 28, wherein the arrangement with the control unit 28 forms a control loop, with which the oscillation frequency f can be regulated to the resonance frequency f r. For this purpose, the sensor signal 5 is supplied to the control unit 28 as an actual value 31. The control unit 28 controls the linear drive element 8 by means of a drive signal 9, so that a controlled system with electrical feedback is formed. A setpoint value 30 can be provided by an optional function generator 32, which is compared in the control unit with the actual value 31 from the sensor. Alternatively, the regulation to the resonant frequency can take place without a set point value specification in the sense of a self-oscillating oscillator solely by the feedback sensor signal.FIG. 6 shows waveforms of the optical assembly. A sinusoidal oscillation 37 of the z-coordinate of the optical component normalized to the amplitude S is shown over the time t normalized to the period duration T. A triangular oscillation 38 can be sought as an ideal case for some applications. In particular, if an image is to be taken at equidistant points of the z coordinate, the image pickups can be taken at temporally equidistant points in time in the case of a triangular oscillation. A triangular oscillation 38 is shown, which has the same frequency, amplitude and phase as the sinusoidal oscillation 37. However, ideal triangular oscillation is difficult to achieve. By exciting the magnet coil with a triangular waveform of the voltage, however, an optimized waveform 39 can be achieved which lies between the sinusoidal oscillation 37 and the ideal triangular oscillation 38.FIG. 7 shows a solenoid with a parallel capacitor. Here, the linear drive element 8 comprises a magnetic coil 11, wherein a capacitor 40 is connected in parallel with the coil 11, which capacitor serves to tune an electrical resonant frequency to a mechanical resonant frequency of the optical arrangement 1.FIG. 8 shows two magnet coils with a parallel capacitor. Here, the solenoid coil 11 of the linear drive element and the solenoid coil 11 aof the compensation arrangement are connected in series and connected in parallel with a capacitor 40.FIG. 9 shows a third exemplary embodiment of an optical arrangement. Here, the optical component 2 comprises a plurality of lenses 2 a, 2 b. Advantageously, the optical arrangement 1 can be used for periodically adjusting a focus position of the optical component 2 along the optical axis 4. In this case, an object (in the sense of an observation object) 33 can be imaged onto an image sensor 34. The periodic movement of the optical component 2 changes the focus position, i.e. the distance of the optical component from the image sensor 34, and as a result different planes of the object 33 are imaged sharply onto the image sensor one after the other. Successively recorded images can thus represent a z-stack. A second sensor 27 can be used to determine the current position of the mount 5 in order to trigger an image recording with the image sensor 34 at predetermined positions.In this example, the first 18, second 19 and third permanent magnetic elements 20 form a contactless return spring. Here, the oscillating element 13 is designed as a ferromagnetic element 10 as a separate component, which is not identical to the second permanent magnetic element 19. Since identical magnetic poles are respectively located opposite one another, a repulsive magnetic coupling 22 is produced. the first and third permanent magnetic elements 18, 20 are connected to the carrier, while the second permanent magnetic element 19 is connected to the mount 5. Since the second permanent-magnetic element 19 experiences a distance-dependent repulsive force on both sides, a force-free position of the restoring spring 16 exists in the middle. Here too, the magnetic coil 11 forms the stator 15 of the linear drive element 8, and the first sensor 26 can be used to drive the linear drive element 8 resonantly.In a modification, the optical component whose position is periodically adjusted may be the image sensor. Then, the image sensor is disposed on the mount and the lenses are fixedly disposed. Such an arrangement is shown below in the fifth embodiment.FIG. 10 shows a fourth exemplary embodiment of an optical arrangement. Here, it is shown how the spring 16 of the first embodiment can be implemented in combination with the arrangement of the third embodiment. It is also shown that the optical imaging can be realized with an individual lens as the optical component 2.FIG. 11 shows a fifth exemplary embodiment of an optical arrangement. In this example, the optical component 2 is designed as an image sensor 34. The second sensor 27 can be embodied as a proximity sensor. It can also be designed as an optical encoder if, for example, a scale is mounted on the horizontal part of the mount 5.In this example, it is also shown that the spring may comprise four permanent magnetic elements 18, 19, 20, 21. Between the first 18 and second 19 and between the third 20 and fourth permanent magnetic elements 21, there is a respective magnetic coupling 22.The reference numerals used uniformly in all figures are as follows: 1 optical arrangement 2 optical component 3 further optical component (fixed) 4 optical axis 5 mount 6 linear guide 7 carrier 8 linear drive element 9 drive force 10 ferromagnetic element 11 magnetic coil 12 coil axis 13 oscillation element 14 direction of movement 15 stator 16 return spring, contactless spring 17 permanent magnetic element 18 first permanent magnetic element 19 second permanent magnetic element 20 third permanent magnetic element 21 fourth permanent magnetic element 22 magnetic coupling 23 restoring force 24 compensation arrangement 25 compensating mass 26 first sensor 27 second sensor 28 control unit 29 drive signal 30 setpoint value 31 actual value 32 function generator 33 object 34 image sensor 35 light beam 36 central beam 37 sinusoidal oscillation 38 triangular oscillation 39 optimized oscillation shape 40 capacitorReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedJP 2003315656 A

[0002] JPH07-162732 A

[0003] DE 2648419 A1

[0004] DE 10 2017 214 474 A1

[0005] US 2021 0 149 170 A1

[0006]

Claims

Optical arrangement (1) comprising • a carrier (7) • an optical component (2) held with a mount (5), in particular wherein the optical component (2) comprises at least one of the following elements: • a plane mirror • a curved mirror • an optical lens • an optical lens group, • a light source • an image sensor • at least one electrically operable linear drive element (8) having an oscillating element (13) and a stator (15), • at least one restoring spring (16), wherein • the stator (15) is mechanically connected to the carrier (7), • the mount (5) is mechanically connected to the oscillating element (13), • the oscillating element (13) is mounted displaceably with respect to the stator (15) in a direction of movement (14), • the linear drive element (8) is provided for the purpose of providing a linear drive element which is free from the action of a linear drive element which is free from the action of a linear drive element which is free from the action of a linear drive element which is free from the optical component, the mount (5) with the optical component (2) to set it into a linear oscillation in the direction of movement (14), • the restoring spring (16) is provided to provide a restoring force between the oscillating element (13) and the stator (15), • the optical arrangement (1) has a resonant frequency f r • the linear drive element (8) can be operated in such a way that the mechanical oscillation has an oscillating frequency f which corresponds to the resonant frequency f r.Optical arrangement (1) according to claim 1, wherein the arrangement also has an attenuation with an attenuation degree D, wherein the quality factor Q=1 / (2*D) is between 5 and 10000, in particular between 10 and 1000, in particular between 20 and 100.Optical arrangement (1) according to one of the preceding claims, wherein the arrangement comprises at least one sensor (26, 27) (in particular magnetic field sensor, coil, position sensor, light barrier).Optical arrangement (1) according to one of the preceding claims, wherein the arrangement additionally has a control unit (28) and the arrangement with the control unit (28) forms a control loop, with which the oscillation frequency f can be regulated to the resonance frequency f r.Optical arrangement (1) according to one of the preceding claims, wherein the arrangement comprises at least one linear guide (6).Optical arrangement (1) according to one of the preceding claims, wherein the restoring spring (16) is formed as a helical spring or is formed as a magnet arrangement comprising a first permanent-magnetic element (18) and a second permanent-magnetic element (19), wherein a repulsive magnetic coupling (22) exists between the first permanent-magnetic element (18) and the second permanent-magnetic element (19).Optical arrangement (1) according to one of the preceding claims, wherein the oscillation element has an amplitude of 1 mm to 20 mm, in particular 2 mm to 10 mm, measured from the smallest to the largest deflection value (peak-to-peak value), and / or a resonance frequency f r between 5Hz and 60Hz, in particular between 7.5Hz and 30Hz.The optical arrangement (1) according to any one of the preceding claims, wherein the linear drive element comprises a coil and a capacitor (40) is connected in parallel with the coil, which capacitor serves to tune an electrical resonance frequency to a mechanical resonance frequency of the optical arrangement (1).Use of an optical arrangement (1) according to one of the preceding claims for periodically adjusting a focus position of the optical component (2).Method for setting an optical component (2) held with a mount (5) into a periodic linear oscillation, comprising the following steps: • providing a periodic electric drive signal (29) with a plurality of periods, • supplying the periodic electric drive signal (29) to an electrically operable linear drive element (8), wherein the linear drive element (8) brings about a drive force on the mount (5), wherein a position of the mount (5) relative to a carrier (7) periodically changes, • applying a restoring force, which is dependent on the position of the mount (5), by means of a restoring spring (16), • continuously recording a measured value of the position of the mount (5) and / or of the instantaneous speed of the mount (5) by means of a first sensor (26), • supplying the measured value to a control unit (28), • Regulating the periodic electric drive signal (29) to a resonant frequency of the optical arrangement by means of the control unit (28).Method according to Claim 10, wherein the oscillation of the optical component is a sinusoidal oscillation or an optimized oscillation shape (39), the temporal profile of which lies between a sinusoidal oscillation (37) and a triangular oscillation (38) of the same amplitude.Method according to Claim 10 or 11, furthermore comprising • imaging an object (33) onto an image sensor (34) by means of the optical component (2), wherein in each case an object-side plane is imaged sharply onto the image sensor (34) as a function of the position of the mount (5), • continuously recording in each case a plurality of images at different positions of the mount (5) by means of the image sensor (34).Method according to claim 12, wherein, during the continuous recording of the images, an image recording is triggered in each case at a specific position of the holder (5).Method according to claims 12 to 13, further comprising • forming a z-stack from a plurality of the recorded images of a period • producing a two-dimensional image of increased depth of field from the z-stack and / or producing a three-dimensional model of the object from the z-stack.The method of claims 12 to 14, further comprising: producing a two-dimensional or three-dimensional video from a plurality of two-dimensional images or three-dimensional models produced in succession.

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