objective lens

Abstract

The objective comprises a lens barrel, an actuator and an adjustable lens, wherein the adjustable lens comprises a primary membrane and a secondary membrane, delimiting opposite sides of a liquid volume in an axial direction, the adjustable lens comprises a container delimiting the liquid volume in a lateral direction, wherein the lateral direction extends perpendicular to the axial direction, the primary membrane and the secondary membrane are attached to opposite sides of the container, the adjustable lens comprises a window member attached to the secondary membrane, wherein the secondary membrane elastically connects the window member and the container, wherein a relative movement of the window member and the container in the axial direction causes a change in the optical properties of the adjustable lens, the window member or the container is fixedly attached to the lens barrel, the actuator is arranged to provide an actuation force in the axial direction, wherein the actuation force acts between the adjustable lens and the lens barrel, and the actuation force causes a relative movement of the window member with respect to the container.

Description

Technical Field

[0001] This application relates to an objective lens. An objective lens is an imaging system arranged to image an object in an object plane onto an image plane. The objective lens can be arranged to take photographs or videos of the object plane. Summary of the Invention

[0002] The objective lens includes a lens barrel, an actuator, and an adjustable lens. The lens barrel is arranged to carry and align optical elements, such as lenses, prisms, filters, or apertures. The adjustable lens is a refractive optical component whose optical properties are adjustable. In particular, the optical properties are at least one of optical power, astigmatism, coma, or prism power. The actuator is arranged to connect to the adjustable lens, wherein the actuator is arranged to control the optical properties of the adjustable lens.

[0003] The adjustable lens includes a primary film and a secondary film that define liquid volumes on opposite sides along an axial direction. Specifically, the primary and secondary films comprise optical surfaces of the adjustable optical components. For example, the primary and secondary films are transparent. Furthermore, the primary and secondary films are flexible, and the shape of at least one film is changed when the optical performance of the adjustable lens is adjusted. The axial direction may correspond to the optical axis of the adjustable lens. The liquid volume is filled with a transparent, preferably incompressible, fluid.

[0004] The adjustable lens includes a container that defines a liquid volume laterally, wherein the lateral direction extends perpendicularly to the axial direction. The container may be annular. The liquid volume may be arranged within the annulus. The container laterally completely surrounds the liquid. In particular, the container comprises a rigid material. For example, the container comprises sheet metal, polymer, silicon, or ceramic. In particular, the container comprises a printed circuit board.

[0005] The primary and secondary membranes are attached to opposite sides of the container. Specifically, the opposite sides of the container to which the primary and secondary membranes are attached are flat. Preferably, the opposite sides of the container extend parallel to each other. The primary and secondary membranes define a liquid volume axially. In particular, the primary membrane, secondary membrane, and container seal the liquid volume in a liquid-tight manner.

[0006] The adjustable lens includes a window member attached to a secondary membrane, wherein the secondary membrane elastically connects the window member to the container. The window member can be transparent and rigid. In particular, the window member is flat on the side facing the secondary membrane. The window member may include curved, particularly convex or concave, optical surfaces. For example, the window member acts as a rigid lens of the objective lens. The window member and the secondary membrane are connected over a large area. In particular, the window member hardens the membrane in the area where it is attached. Laterally, the window member is surrounded by a portion of the secondary membrane that is not covered by the window element. This portion of the secondary membrane elastically suspends the window member above the container. In particular, as seen axially in a top view, the container laterally surrounds the window member. For example, as shown in the top view, the outer diameter of the window member is smaller than the inner diameter of the container.

[0007] The relative axial movement of the window component and the container causes a change in the optical properties of the adjustable lens. The optical properties can be at least one of optical power, prism power, astigmatism angle, astigmatism degree, or coma.

[0008] The window component or container is fixedly attached to the lens barrel. In particular, the optical axis of the adjustable lens is aligned with the optical axis of the lens barrel. In particular, the optical axis of the lens barrel coincides with that of the adjustable lens.

[0009] The actuator is arranged to provide an actuating force along the axial direction, which causes relative movement of the window member relative to the container. The actuating force can act symmetrically with respect to the optical axis of the adjustable lens. In particular, a symmetrical actuating force causes a change in the optical power of the adjustable lens. Alternatively, the actuating force can act asymmetrically, causing the window member to tilt relative to the container, thus altering the prism power of the adjustable lens.

[0010] According to one embodiment, the objective lens includes a lens barrel, an actuator, and an adjustable lens. The adjustable lens includes a primary film and a secondary film defining liquid volumes on opposite sides along an axial direction. The adjustable lens includes a container defining the liquid volume laterally, wherein the lateral direction extends perpendicular to the axial direction, and the primary and secondary films are attached to opposite sides of the container. The adjustable lens includes a window member attached to the secondary film, wherein the secondary film elastically connects the window member to the container. Relative movement of the window member and the container along the axial direction causes a change in the optical properties of the adjustable lens. The window member or container is fixedly attached to the lens barrel. The actuator is arranged to provide an actuating force along the axial direction, wherein the actuating force acts between the adjustable lens and the lens barrel. The actuating force causes relative movement of the window member relative to the container.

[0011] This objective lens is based on the following considerations. The imaging quality of an objective lens is highly dependent on the alignment of the refractive components relative to each other. In objectives that only include rigid optical components, they are aligned by arranging the rigid optical components within the same lens barrel. However, the actuators connecting the adjustable optical components require additional space, thus the adjustable optical components must be arranged outside the lens barrel.

[0012] This objective lens utilizes the concept of attaching an adjustable lens to the lens barrel and integrating the lens barrel into the actuation of the adjustable lens.

[0013] Advantageously, the attachment of the adjustable lens to the lens barrel is aligned particularly well, and the integration achieves a particularly compact objective geometry.

[0014] According to one embodiment, the lens barrel is cylindrical and has a recess extending from a first surface completely through the lens barrel to a second surface, wherein at least one static refractive element is disposed in the recess of the lens barrel, and an adjustable lens is fixedly attached to the first surface. Specifically, the optical axis of the adjustable lens is aligned with the optical axis of the static refractive element. In particular, the adjustable lens includes an objective aperture. Preferably, a container constitutes the objective aperture.

[0015] The actuator may be arranged on the side of the adjustable lens facing the lens barrel. In particular, the actuator, or portions thereof, completely surround the lens barrel along the transverse plane. Preferably, the actuator does not protrude beyond the adjustable lens on the side facing away from the lens barrel. The adjustable lens is directly attached to the lens barrel on the side facing it. Specifically, the total distance measured axially from the second surface to the side of the adjustable lens facing away from the lens barrel is equivalent to the sum of the distance between the first and second surfaces and the distance between opposite sides of the adjustable lens. In particular, the actuator does not contribute to the total distance, and the actuator does not protrude beyond the second surface or beyond the side of the adjustable lens facing away from the lens barrel.

[0016] According to one embodiment, the objective lens includes a mounting unit and a substrate, wherein the lens barrel is attached to the substrate via the mounting unit. The side surface of the lens barrel includes external threads, and the mounting unit includes internal threads, wherein the external and internal threads are complementary. The mounting unit may include conductive structures arranged to electrically connect an actuator. In particular, the mounting unit is fixedly attached to the substrate. The substrate may include a printed circuit board (PCB). The PCB may be arranged to electrically connect the conductive structures to the actuator. In particular, the external and internal threads may include complementary conductive portions, thereby providing an electrical connection between the mounting unit and the lens barrel.

[0017] According to one embodiment, the actuator is a voice coil actuator, including a magnet and a coil, wherein the coil is fixedly attached to the lens barrel, and the magnet is fixedly attached to the adjustable lens. The coil may be attached to a first surface. Alternatively, the coil may be wound around the lens barrel. In particular, the coil is part of a printed circuit board. For example, the coil is integrally formed with the printed circuit board, and the coil includes conductive printed lines of the printed circuit board.

[0018] According to one embodiment, as seen in the top view along the axial direction, the magnet is toroidal, and as shown in the top view, a coil extends along the inner edge and / or outer edge of the magnet. The magnet is magnetized axially. Therefore, the coil is arranged in a region where the magnetic field vector of the magnetic field extends at least partially laterally. The laterally portion of the magnetic field vector contributes to the axial Lorentz force. The toroidal magnet extends about an opening, wherein the inner edge faces the opening and the outer edge faces away from the opening. When the coil extends along the inner edge, as shown in the top view, the coil has a profile substantially the same as the inner edge. When the coil extends along the outer edge, as shown in the top view, the coil has a profile substantially the same as the outer edge. In particular, the coil coincides with either the inner or outer edge.

[0019] According to one embodiment, the magnet has a beveled shape such that the thickness of the magnet, measured axially, at its inner edge is greater than its thickness at its outer edge. In particular, when the main extending plane of the magnet is arranged parallel to the first surface or parallel to the main extending plane of the coil, the distance from the outer edge to the coil or to the first surface is greater than the distance from the inner edge to the coil or to the first surface. Advantageously, when the magnet is tilted relative to the coil, the beveled shape of the magnet increases the range of motion of the magnet relative to the coil.

[0020] According to one embodiment, the coil includes at least three coil portions, each coil portion including a first segment and a second segment. The first segment extends sequentially along the inner edge of the magnet and / or the second segment extends sequentially along the outer edge of the magnet. As shown in the top view, the first segment overlaps with a portion of the inner edge, and the second segment overlaps with a portion of the outer edge. For example, as shown in the top view, the coil portions have a kidney shape. The coil portions are distributed along the periphery of the toroidal magnet, and the current flowing through the coil portions is individually controllable. Depending on the current direction and current intensity, the magnet is attached to or repelled by the coil portions due to the Lorentz force. In particular, in each coil portion, the direction of the current in the first segment is opposite to the direction of the current in the second segment.

[0021] For example, when the currents in the coil sections have the same direction and the same current intensity, the coil sections attach or repel each other evenly. This evenly distributed current causes the coil to translate axially relative to the magnet, which in turn causes a change in the optical power of the adjustable lens.

[0022] By individually controlling the current intensity and direction within the coil section, the attraction and repulsion between the coil section and the magnet can be controlled independently. The uneven distribution of attraction and repulsion within the coil section causes the magnet to tilt relative to the coil. This tilt allows for alteration of the prism of the adjustable lens, which is particularly useful for optical image stabilization.

[0023] According to one embodiment, the actuator includes a piezoelectric element attached to a lens barrel and an adjustable lens. The piezoelectric element may be coupled to a first surface, container, or window member. The piezoelectric element is arranged to change the adjustment state of the adjustable lens. In particular, the piezoelectric element includes multiple segments arranged along the circumference of the adjustable lens, wherein these segments are individually controllable. By individually controlling the piezoelectric element, the window member or container can be tilted relative to the lens barrel.

[0024] According to one embodiment, the actuator includes an SMA element, which is attached to an adjustable lens and to a mounting unit and / or lens barrel. Specifically, the SMA element comprises multiple wires containing a shape memory alloy material. In the adjustable lens, the wires may be coupled to a window element or a container. The wires may be attached to the mounting unit and / or lens barrel. For actuation, a current is applied to the wires, thereby changing the shape of the wires. The change in the shape of the wires generates a force used to control the adjustment state of the adjustable lens.

[0025] According to one embodiment, the SMA element includes a first SMA segment for generating a force in a first direction, and a second SMA segment for generating a force in a second direction, wherein the first and second directions are axially opposite to each other. Specifically, the first SMA segment is arranged to move a container or window element away from the lens barrel, and the second SMA segment is arranged to move the container or window element towards the lens barrel. The first and second SMA segments are uniformly distributed along the circumference of the adjustable lens. In particular, the first and second segments are individually controllable.

[0026] According to one embodiment, the actuator is electrically connected to a substrate via a bonding wire, which connects to a lens barrel, a mounting unit, and / or the substrate. In particular, the lens barrel and / or mounting unit may include a bonding pad providing an area for attaching the bonding wire. Specifically, the bonding pad may be embedded in an electrically insulating material. Therefore, the bonding pad only provides mechanical mounting of the bonding wire. In particular, no current flows through the bonding pad during intended operation.

[0027] According to one embodiment, the actuator is electrically connected to the substrate via a molded conductive structure integrally formed with the mounting unit and / or the lens barrel. The molded conductive structure may integrally have external and internal threads. Therefore, the interlocking connection between the external threads of the lens barrel and the internal threads of the mounting unit provides electrical connection to the actuator.

[0028] Further advantages and advantageous embodiments of the objective lens, as well as other embodiments, are derived from the following exemplary examples, in conjunction with the accompanying drawings. Attached Figure Description

[0029] The attached diagram shows:

[0030] Figure 1 , 2Figures 3, 4, 5, 6, 7, 9, and 11 show schematic cross-sectional views of exemplary embodiments of the objective lens;

[0031] Figure 8 and 10 A schematic top view showing an exemplary embodiment of the objective lens actuator; and

[0032] Figure 12 A schematic perspective view of an exemplary embodiment of the objective lens is shown.

[0033] In the accompanying drawings, identical, similar, or equivalent elements are given the same reference numerals. The size ratios between the elements shown in the drawings and figures should not be considered to be proportional. Rather, for better illustration and / or better understanding, individual elements may be shown exaggeratedly. Detailed Implementation

[0034] Figure 1 An exemplary embodiment of objective lens 1 is shown in schematic cross-sectional view. Objective lens 1 includes a lens barrel 20, an actuator 30, and an adjustable lens 10, wherein the adjustable lens 10 includes a primary film 101 and a secondary film 102, which define liquid volumes 100 on opposite sides along an axial direction. The axial direction extends along an optical axis 106.

[0035] The adjustable lens 10 includes a container 103 that defines a liquid volume 100 in the lateral direction, wherein the lateral direction extends perpendicular to the axial direction, and a primary membrane 101 and a secondary membrane 102 are attached to opposite sides of the container 103.

[0036] The adjustable lens 10 includes a window member 104 attached to a secondary membrane 102, wherein the secondary membrane 102 elastically connects the window member 104 to a container 103. The secondary membrane 102 laterally protrudes beyond the window member 104. The window member 104 is attached to the lens barrel 20. Relative axial movement between the window member 104 and the container 103 causes changes in the optical performance of the adjustable lens 10. The window member 104 or the container 103 is fixedly attached to the lens barrel 20.

[0037] Actuator 30 is arranged to provide an actuating force 300 along the axial direction, wherein the actuating force 300 acts between the adjustable lens 10 and the lens barrel 20. The actuating force 300 causes relative movement of the window member 104 relative to the container 103. Actuator 30 is a voice coil actuator, including a magnet 31 and a coil 32, wherein the coil 32 is fixedly attached to the lens barrel 20 and the magnet 31 is fixedly attached to the adjustable lens 10. The actuating force 300 is a Lorentz force.

[0038] The lens barrel 20 has a cylindrical shape and a recess extending from a first surface 21 completely through the lens barrel 20 to a second surface 22. At least one static refractive element 200 is arranged within the recess of the lens barrel 20, and an adjustable lens 10 is fixedly attached to the first surface 21. In particular, a window member 104 is fixedly attached to the lens barrel 20, while a container 103 is attached to a magnet 31. An actuating force 300 moves the container relative to the lens barrel 20.

[0039] The objective lens includes a mounting unit 40 and a substrate 50, wherein the lens barrel 20 is attached to the substrate 50 via the mounting unit 40. The mounting unit 40 is arranged to align the lens barrel 20 with respect to the substrate 50. The substrate includes an image sensor 51. The image sensor 51 is arranged in the image plane of the objective lens and is configured to capture an image of the object plane. The side surface of the lens barrel 20 includes external threads, and the mounting unit 40 includes internal threads, wherein the external threads and internal threads are complementary. An actuator 30 is electrically connected to the substrate 50 via a bonding wire 60, wherein the bonding wire 60 is connected to the substrate 50.

[0040] Figure 2 An exemplary embodiment of the objective lens 1 is illustrated in schematic cross-sectional view. A container 103 is fixedly attached to the lens barrel 20 via a coil 32. The coil comprises a PCB with insulators and conductive printed lines, extending circumferentially about the optical axis. A window element 104 is suspended via a secondary membrane 102. An actuation force 300 moves the window element relative to the lens barrel 20. The objective lens 1 includes a voice coil actuator having a single coil 32 extending along the inner edge 310 of a magnet 310. A magnet 31 is fixedly attached to the window element 104 via an aperture 105.

[0041] The magnet 31 has an inclined shape, such that the thickness of the magnet 31 along the axial direction at its inner edge 310 is greater than the thickness at its outer edge 311. Advantageously, especially when the magnet 31 is tilted relative to the coil 32, the inclined magnet 31 increases the range of motion of the magnet 31 relative to the coil 32.

[0042] Figure 3 An exemplary embodiment of the objective lens 1 is shown in a schematic cross-sectional view. The objective lens is a voice coil actuator including a magnet 31 and a coil 32. The actuator is arranged to move a container 103, wherein a window member 104 is fixedly attached to the lens barrel. The actuator 30 is electrically connected to the substrate 50 via a molded conductive structure 51, which is integrally formed with the mounting unit 40. In particular, the molded conductive structure can be integrally formed with the lens barrel 20. In particular, the molded conductive structure can form adjacent portions of external and internal threads.

[0043] Figure 4 An exemplary embodiment of objective lens 1 is shown in a schematic cross-sectional view. Figure 4 The embodiments differ from Figure 3In the illustrated embodiment, container 103 is fixedly attached to lens barrel 20, and actuator 30 is arranged to move window member 104 relative to lens barrel 20. Aperture 105 connects magnet 31 to window member 104. In particular, aperture 105 determines the depth of field of the objective lens.

[0044] Figure 5 An exemplary embodiment of the objective lens 1 is shown in a schematic cross-sectional view. The actuator 30 includes a piezoelectric element 33, which is attached to the lens barrel 20 and the adjustable lens 10. Specifically, the piezoelectric element 33 is arranged to move the container 103 relative to the lens barrel along the optical axis 106. A window member 104 is fixedly attached to the lens barrel 20. A molded conductive structure 51 provides an electrical connection between the substrate 50 and the piezoelectric element 33. The molded conductive structure is embedded within the mounting unit 40.

[0045] Figure 6 An exemplary embodiment of the objective lens 1 is shown in a schematic cross-sectional view. Figure 6 The illustrated embodiments and Figure 3 The difference in the illustrated embodiment is that the coil 32 includes a PCB, wherein conductive printed lines are embedded within an insulating structure. The conductive printed lines and the insulating structure are arranged in layers.

[0046] As can be seen in the top view along the optical axis 106, the magnet 31 is annular, and as shown in the top view, the coil 32 extends along the inner edge 310 of the magnet 31.

[0047] Figure 7 An exemplary embodiment of the objective lens 1 is illustrated in a schematic cross-sectional view. Figure 8The actuator 30 of the corresponding embodiment is shown in a top view along optical axis 106. The coil 32 includes four coil portions 320, 321, 322, and 323. One coil portion 320 extends along its outer edge 311 around the other three coil portions 321, 322, and 323. The three coil portions 321, 322, and 323 respectively include first segments 321a, 322a, and 323a and second segments 321b, 322b, and 323b. The first segments 321a, 322a, and 323a extend sequentially along the inner edge 310 of the magnet 31. The three coil portions 321, 322, and 323 are distributed along the periphery of the annular magnet 31. In particular, each of the first segments 321a, 322a, and 323a extends at least 90° along the periphery of its inner edge. In particular, each coil portion extends at an equal angle around the inner edge 310. The current through coil portions 320, 321, 322, and 323 is individually controllable. The current in coil portion 320, extending along the outer edge 311, causes coil 32 to translate relative to magnet 31 along optical axis 106, thus causing a change in the optical power of adjustable lens 10. The non-uniform currents in the three coils 321, 322, and 323 cause coil 32 to tilt relative to magnet 31. The axis of rotation of the tilting motion extends perpendicularly to optical axis 106. The tilting motion causes a change in the prism power of adjustable lens 10. In particular, the tilting motion can be controlled to perform optical image stabilization for images captured through the objective lens.

[0048] Alternatively, coil portion 320 may extend along the inner edge 310 of the magnet, and three coil portions 321, 322, and 323 may be arranged around coil portion 320. According to this alternative, second segments 321b, 322b, and 323b extend along the outer edge 311 of the magnet.

[0049] Figure 9 An exemplary embodiment of the objective lens 1 is illustrated in a schematic cross-sectional view. Figure 10 The actuator 30 of the corresponding embodiment is shown in a top view along the optical axis 106. Figure 7 Implementation examples and Figure 9The difference in the illustrated embodiment lies in the arrangement of the coil portions 321, 322, and 323. Each of the coil portions 321, 322, and 323 includes first segments 321a, 322a, and 323a, and second segments 321b, 322b, and 323b, wherein the first segments extend along the inner edge 310 and the second segments extend along the outer edge 311. The coil portions 321, 322, and 323 extend uniformly along the circumference of the magnet. The uniform current in the coil portions 321, 322, and 323 causes the coil 32 to translate relative to the magnet 31 along the optical axis 106. The non-uniform current distribution in the coil portions causes the coil 32 to tilt relative to the magnet 31. The currents in the first segments 321a, 322a, and 323a flow in the opposite direction to those in the second segments 321b, 322b, and 323b, respectively. The magnetic field is arranged such that the currents in the two segments of the same portion act in the same direction. For example, all sections of the coil are repelled or all sections of the coil are attracted by the magnet.

[0050] Figure 11 An exemplary embodiment of the objective lens 1 is shown in a schematic cross-sectional view. The actuator 30 includes an SMA element 34, which is attached to the adjustable lens 10 and to the mounting unit 40 and / or the substrate 50. The SMA element is arranged to pull the container toward the substrate 50 along the optical axis 106. The SMA element includes multiple lines, which are equidistantly attached along the periphery of the adjustable lens 10. These lines are individually controlled. Therefore, the tilt of the container 103 relative to the window member 104 can be controlled by the lines. In particular, the elastic properties of the secondary membrane provide a holding force that returns the adjustable lens 10 to its original state.

[0051] Figure 12 An exemplary embodiment of the objective lens 1 is shown in a schematic cross-sectional view. Figure 12 The illustrated embodiments and Figure 11 The difference in the illustrated embodiment is that the SMA element 34 includes a first SMA segment 341 for generating a force in a first direction and a second SMA segment 342 for generating a force in a second direction, wherein the first and second directions are axially opposite to each other. The SMA element is arranged to move the container away from and toward the substrate 50. Advantageously, a greater range of adjustment is provided by the first SMA segment 341 and the second SMA segment 342.

[0052] Objective lens 1 includes lens barrel 20, actuator 30, and adjustable lens 10, wherein adjustable lens 10 includes primary film 101 and secondary film 102, which define liquid volumes 100 on opposite sides along the axial direction. The axial direction extends along optical axis 106.

[0053] The adjustable lens 10 includes a window member 104 attached to a secondary membrane 102, wherein the secondary membrane 102 elastically connects the window member 104 to the container 103. The secondary membrane 102 laterally protrudes beyond the window member 104. The window member 104 is attached to the lens barrel 20. Relative axial movement between the window member 104 and the container 103 causes changes in the optical performance of the adjustable lens 10. The window member 104 is fixedly attached to the lens barrel 20.

[0054] Actuator 30 is arranged to provide actuation force 300 axially, wherein actuation force 300 acts between adjustable lens 10 and mounting unit 40. Actuation force 300 causes relative movement of window member 104 relative to container 103. Actuator 30 is a voice coil actuator comprising magnet 31 and coil 32. Coil 32 is fixedly attached to mounting unit 40. In particular, coil 32 is integrally formed with mounting unit 40. For example, mounting unit may be a molded part molded around coil 32. Coil 32 may be completely surrounded on all sides by mounting unit 40. In particular, conductive structure 61 for electrical contact with the coil is embedded in mounting unit 40.

[0055] Magnet 31 is fixedly attached to adjustable lens 10. The adjustable lens protrudes laterally beyond lens barrel 20 and is perpendicular to the optical axis. Therefore, as shown in the top view, coil 32 and magnet 31 at least partially overlap along optical axis 107. When current is applied to coil 32, a Lorentz force acts between magnet 31 and coil 32, thus generating actuation force 300.

[0056] The objective lens includes a mounting unit 40 and a substrate 50, wherein the lens barrel 20 is attached to the substrate 50 via the mounting unit 40. Specifically, the lens barrel 20 is attached to the mounting unit 40 via an adhesive material. The mounting unit 40 is arranged to align the lens barrel 20 with respect to the substrate 50. The substrate includes an image sensor 51. The image sensor 51 is arranged within the image plane of the objective lens and is configured to capture an image of the object plane.

[0057] In two directions, the mounting unit 40 protrudes from the lens barrel 20 and the adjustable lens 10 along the optical axis 106. A protective element is arranged on the side of the mounting unit 40 facing away from the substrate 50. The protective element may include a transparent material arranged to protect the adjustable lens 10. In particular, the protective element may include glass or a polymer film.

[0058] This invention is not limited to the description based on these embodiments. Rather, the invention includes any new features and any combination of features, particularly any combination of features in the claims, even if the feature or combination itself is not expressly stated in the claims or embodiments.

[0059] List of reference numerals

[0060] 1 objective lens

[0061] 10 adjustable lenses

[0062] 100 liquid volume

[0063] 101 Class I membrane

[0064] 102 secondary membrane

[0065] 103 container

[0066] 104 window components

[0067] 105 aperture

[0068] 106 optical axes

[0069] 20-lens telescope tube

[0070] 21 First page

[0071] 22 Second page

[0072] 200 refractive component

[0073] 30 actuators

[0074] 31 magnets

[0075] 310 inner edge

[0076] 311 outer edge

[0077] 32 coils

[0078] Coil sections 320, 321, 322, and 323

[0079] Section 1 of 321a, 322a, and 323a

[0080] Sections 321b, 322b, and 323b, Part Two

[0081] 33 Piezoelectric elements

[0082] 34SMA components

[0083] 341 First SMA Component

[0084] 342 Second SMA Component

[0085] 300 Power

[0086] 40 installation units

[0087] 50 base

[0088] 51 Image Sensor

[0089] 60 joint line

[0090] 61 Conductive Structure

Claims

1. An objective lens (1), comprising a lens barrel (20), an actuator (30), and an adjustable lens (10), wherein The adjustable lens (10) includes a primary film (101) and a secondary film (102) that define liquid volumes (100) on opposite sides along the axial direction. The adjustable lens (10) includes a container (103) that defines a liquid volume (100) laterally, wherein the lateral direction extends perpendicular to the axial direction, and the primary membrane (101) and the secondary membrane (102) are attached to opposite sides of the container (103). The adjustable lens (10) includes a window member (104) attached to the secondary membrane (102), wherein the secondary membrane (102) elastically connects the window member (104) to the container (103). The relative axial movement of the window component (104) and the container (103) causes a change in the optical performance of the adjustable lens (10). The window component (104) or the container (103) is fixedly attached to the lens barrel (20). The actuator (30) is arranged to provide an actuating force (300) along the axial direction, wherein the actuating force (300) acts between the adjustable lens (10) and the lens barrel (20), and The actuating force (300) causes relative movement of the window component (104) relative to the container (103). The actuator (30) is a voice coil actuator, comprising a magnet (31) and a coil (32), wherein the coil (32) is fixedly attached to the lens barrel (20) and the magnet (31) is fixedly attached to the adjustable lens (10).

2. The objective lens according to claim 1, wherein The lens barrel (20) is cylindrical. The lens barrel (20) has a recess that extends from the first surface (21) through the lens barrel (20) to the second surface (22). At least one static refractive element (200) is disposed within a recess of the lens barrel (20), and The adjustable lens (10) is fixedly attached to the first surface (21).

3. The objective lens according to claim 1 or 2, comprising a mounting unit (40) and a base (50), wherein The lens barrel (20) is attached to the substrate (50) via the mounting unit (40). The side surface of the lens barrel (20) includes an external thread, and the mounting unit (40) includes an internal thread, wherein the external thread and the internal thread are complementary.

4. The objective lens according to claim 1, wherein The magnet (31) is circular in shape along the axial direction as seen in the top view. The coil (32) extends along the inner edge (310) and / or outer edge (311) of the magnet (31), as can be seen from the top view.

5. The objective lens according to claim 4, wherein The magnet (31) has a beveled shape, such that the thickness of the magnet (31) along the axial direction at the inner edge (310) is greater than the thickness at the outer edge (311).

6. The objective lens according to claim 1, wherein... The coil (32) includes at least three coil sections (321, 322, 323). Each of the three coil sections (321, 322, 323) includes a first segment (321a, 322a, 323a) and a second segment (321b, 322b, 323b). The first segment (321a, 322a, 323a) extends sequentially along the inner edge (310) of the magnet (31) and / or the second segment (321b, 322b, 323b) extends sequentially along the outer edge (311) of the magnet. The coil portions (321, 322, 323) are distributed along the periphery of the ring magnet (31), and The current through the coil sections (321, 322, 323) is individually controllable.

7. The objective lens according to claim 1 or 2, wherein the actuator (30) includes a piezoelectric element (33) attached to the lens barrel (20) and the adjustable lens (10).

8. The objective lens according to claim 3, wherein the actuator includes an SMA element (34), wherein the SMA element (34) is attached to the adjustable lens (10) and to the mounting unit (40) and / or the lens barrel (20).

9. The objective lens of claim 8, wherein the SMA element (34) includes a first SMA segment (341) for generating a force in a first direction and a second SMA segment (342) for generating a force in a second direction, wherein the first direction and the second direction are axially opposite to each other.

10. The objective lens according to claim 3, wherein The actuator (30) is electrically connected to the substrate (50) via a bonding wire, wherein the bonding wire is connected to the lens barrel (20), the mounting unit (40) and / or the substrate (50).

11. The objective lens according to claim 3, wherein The actuator (30) is electrically connected to the substrate (50) via a molded conductive structure integrally formed with the mounting unit (40) and / or the lens barrel (20).

Images