Optical device for carrying optical element, in particular for pixel shifting

Abstract

The invention relates to an optical device (1) for carrying an optical element (2), in particular for pixel displacement, comprising an optical axis (3), a carrier (4), a frame (5) supported on the carrier by at least one pivot joint (6) allowing the frame to pivot about two axes (A, A '), an optical element (2) connected to the frame (5), the optical element comprising a clear aperture (CA), the optical element (2) comprises a frame (5), a spring structure (7) connecting the frame to the carrier, and an actuator (M1, M2, C1, C2) configured to generate a force parallel to the optical axis (3) to pivot the frame (5), in which the pivot joint (6) is arranged outside the clear aperture (CA) of the optical element (2).

Description

TECHNICAL FIELD

[0001] The present invention relates to an optical device allowing tilting of an optical element, in particular for pixel shifting. BACKGROUND

[0002] The device is in particular for carrying and tilting an optical element, e.g. a flat transparent plate with two opposing parallel optical surfaces, between at least two positions. One important application of the device is a so-called pixel shifter (often abbreviated as XPR) which can be used to increase the resolution of an image projected by the tilted glass plate of the pixel shifter.

[0003] In particular, the resolution of an image can be increased by moving the image, e.g. by half a pixel, between image captures and combining the images into a composite image. The shift can be achieved by letting the light used for projecting the image onto an image sensor pass through the optical element, e.g. the plate, and tilting the latter around a defined axis by a defined angle, e.g. corresponding to a half pixel shift.

[0004] However, for many applications such optical devices have to have a particularly small footprint. In particular, often there is no isotropic available space around the optical aperture, i.e. the available space on different sides around the optical aperture is different. Often, due to limitations from the optical system of the application, it is limited on one particular side.

[0005] In particular, US 2021 / 0278661 A1 discloses an out-of-plane actuator, i.e. a coil and magnet are stacked along the z direction, wherein a symmetric arrangement of coil and magnet is provided around the optical aperture. The support of the optical element is based on springs which do not provide a fixed Z position which can lead to a parasitic piston mode of the optical element. SUMMARY

[0006] Based on the above, the problem to be solved by the present invention is to provide an optical device which reduces the parasitic piston mode of the optical element and in particular allows to omit an actuator at least along one side of the optical element to allow for an application of the optical device in case no symmetric space is available around the optical aperture.

[0007] The problem underlying the present invention is solved by an optical device having the features of claim 1. Preferred embodiments of this aspect of the invention are set out in the dependent claims and described below.

[0008] According to claim 1, an optical device for carrying an optical element, in particular for pixel shifting, is disclosed, the optical device comprising: an optical axis, a carrier, wherein in particular the optical axis extends perpendicular to the carrier, a frame supported on the carrier by at least one pivot joint, the pivot joint allowing the frame to pivot around two axes, wherein the frame comprises a fixed position at the pivot joint in a direction parallel to the optical axis, an optical element connected to the frame, the optical element comprising a clear aperture and being pivotable with the frame, a spring structure connecting the frame to the carrier to allow the frame and the optical element to perform the tilting around the two axes relative to the carrier, and an actuator configured to generate a force parallel to the optical axis to pivot the frame, wherein the pivot joint is arranged outside the clear aperture of the optical element. In particular, the pivot joint is arranged more outward in a lateral direction perpendicular to the optical axis than a contour defining the clear aperture.

[0009] Further, according to one preferred embodiment, the axes around which the frame is able to pivot pass through the at least one pivot joint.

[0010] According to one preferred embodiment of the present application, the actuator comprises a first magnet and a second magnet, and a first coil and a second coil, wherein the first magnet faces the first coil in a direction of the optical axis of the optical device, and wherein the second magnet faces the second coil in said direction of the optical axis, wherein the first magnet and the second magnet are arranged on the frame, respectively, and the first coil and the second coil are arranged on the carrier, respectively. However, in preferred embodiments, the first magnet and the second magnet are arranged on the carrier, respectively, and the first coil and the second coil are arranged on the frame, respectively. This interchange of the position of the coils with the associated magnets can also apply to the embodiments described further below.

[0011] Further, according to one preferred embodiment of the present application, the clear aperture comprises a contour, the contour comprising at least two sections connected by an intermediate section, the intermediate section extending obliquely with respect to said at least two sections.

[0012] According to another preferred embodiment of the present application, the at least one pivot joint is a single pivot joint, i.e. the optical device comprises only one pivot joint for pivoting the frame.

[0013] Further, in one preferred embodiment of the present application, the carrier comprises a first leg having a first end section and an opposite second end section, and wherein the carrier comprises a second leg protruding from the first end section and a third leg protruding from the second end section, wherein the second leg and the third leg each comprise a free end, such that the three legs define a recess for the light to pass through for the carrier, wherein the optical element is arranged in front of or at least partially arranged in the recess. In other words, the carrier essentially comprises a C-shape.

[0014] According to another preferred embodiment of the invention, a first coil is arranged on a second leg, and a second coil is arranged on a third leg, and a pivot joint is arranged on the first leg. Specifically, a spring structure connects the frame to the second leg, and specifically, a spring structure connects the frame to the third leg. For this purpose, the spring structure may include a first spring element connecting the frame to the second leg, and a further second spring element connecting the frame to the third leg. The spring elements may be integrally formed with the frame.

[0015] According to another preferred embodiment of the invention, the pivot joint is connected to the first leg of the carrier via a first standoff. Additionally or alternatively, a spring structure, particularly a first spring element, is connected to the second leg of the carrier via a (second) standoff. Further, preferably, a spring structure, particularly a second spring element, is connected to the third leg of the carrier via a (third) standoff.

[0016] Furthermore, according to a preferred embodiment of the invention, the corresponding support is a surface mount device (SMD) support, which is soldered to the carrier. Alternatively, the support may be integrally formed with the frame and / or carrier.

[0017] According to another preferred embodiment of the invention, the magnet, coil and optical element are arranged on the same side of at least one pivot joint, and in particular, the at least one pivot joint is a single pivot joint.

[0018] In this regard, according to a preferred embodiment of the present invention, - A first coil extends along a first edge of the optical element, and wherein a second coil extends along an adjacent second edge of the optical element, the first and second edges defining a corner region of the optical element, and wherein at least one pivot joint is disposed on the carrier at the second corner region of the optical element, the second corner region being diagonally opposite to the first corner region, or - The first coil and the second coil extend successively along the first edge of the optical element, and at least one pivot joint is arranged on the carrier at the opposite second edge of the optical element, or - A first coil extends along a first edge of the optical element, and a second coil extends along a opposite second edge of the optical element, wherein the optical device includes a third coil disposed on a carrier and a third magnet disposed on a frame facing the third coil in the optical axis direction, wherein the third coil extends along a third edge of the optical element adjacent to the first and second edges, and wherein at least one pivot joint is disposed on the carrier at a fourth edge of the optical element opposite to the third edge and adjacent to the first and second edges of the optical element.

[0019] According to another preferred embodiment of the invention, a first coil extends along a first edge of the optical element, and a second coil extends along an adjacent second edge, the first and second edges defining a corner region of the optical element, wherein at least one pivot joint is disposed on the carrier at the corner region of the optical element.

[0020] Furthermore, according to another preferred embodiment of the invention, the coil and magnet are arranged on one side of at least one pivot joint, and the optical element is arranged on the other side of at least one pivot joint.

[0021] In this regard, in a preferred embodiment of the invention, - A first coil extends along a first edge of the carrier, and a second coil extends along an adjacent second edge, the first and second edges defining a corner region of the carrier, and at least one pivot joint is disposed at this corner region of the carrier, or - The first coil and the second coil extend obliquely relative to the first edge of the carrier, and at least one pivot joint is arranged at the first edge of the carrier, or - A first coil extends parallel to a first edge of the carrier, and a second coil extends perpendicular to the first edge of the carrier, wherein the optical device includes a third coil disposed on the carrier and a third magnet disposed on a frame facing the third coil in the optical axis direction, wherein the third coil extends perpendicular to the first edge of the carrier, and wherein at least one pivot joint is disposed at the first edge of the carrier.

[0022] According to another preferred embodiment of the present invention, the first magnet and the second magnet are magnetized to be parallel to the optical axis.

[0023] Furthermore, in a preferred embodiment of the invention, the carrier is a printed circuit board, particularly wherein the first coil and the second coil are integrated into the printed circuit board, for example, including conductive traces of the printed circuit board.

[0024] According to another preferred embodiment of the invention, the center of the first coil and the second coil of the pivot joint and the actuator defines a virtual triangle, the virtual triangle comprising an area of ​​at least 25% of the aperture area, preferably at least 35% of the aperture area, and more preferably at least 50% of the aperture area.

[0025] According to another preferred embodiment of the invention, the frame includes a first arm connected to a pivot joint via a strut, a second arm integrally connected to a first end of the first arm, and a third arm integrally connected to a second end of the first arm, wherein the second and third arms have a width greater than the width of the first arm along the extension plane of the optical element, and wherein the spring structure includes a first meandering spring element and a second meandering spring element, wherein the first meandering spring element connects the end of the second arm of the frame to the carrier (particularly via a second strut, see above), and wherein the second meandering spring element connects the end of the third arm of the frame to the carrier (particularly via a third strut), and wherein the frame includes a gap between the ends of the second and third arms.

[0026] In a preferred embodiment of the invention, the optical device includes a spring structure having a first spring element and a second spring element. The first spring element includes a first flexible portion connecting a second arm of a frame to a carrier. The second spring element includes a second flexible portion connecting a third arm of the frame to a carrier. The first flexible portion extends substantially parallel to the main extension direction of the second arm of the frame, and the second flexible portion extends substantially parallel to the main extension direction of the third arm of the frame.

[0027] According to the above embodiment, the second and third arms of the frame are each attached to the carrier by a spring element. The first and / or second flexible portions can be designed with a simple geometry. In particular, they can each be designed as a bending beam that deforms due to the force of the actuator and thereby exerts a restoring force on the frame. Due to the parallel orientation of the first and second flexible portions relative to the second and third arms of the frame, a compact design of the device is possible. Preferably, the frame includes a gap between the ends of the second and third arms. Within the scope of the invention, the spring elements each include other components in addition to their respective flexible portions, such as a base through which the spring element is directly or indirectly connected to the carrier; and / or, for example, a connection portion between the respective flexible portion and the base.

[0028] In a preferred embodiment, the first flexible portion is attached to the second arm of the frame at a section between the ends of the first arm and the second arm of the frame. Additionally or alternatively, the second flexible portion may be attached to the third arm of the frame at a section between the ends of the first arm and the third arm of the frame.

[0029] According to the above embodiment, the first or second flexible portion of the corresponding spring element can be connected to the second or third arm of the frame, in a region approximately centered relative to the main extension direction of said arm. Studies have shown that this arrangement is advantageous in terms of a good ratio between the adjusting force required to tilt the frame and the restoring force generated by the spring element.

[0030] In a preferred embodiment, the first and / or second flexible portions are beams, which are integrally connected, in particular, to the second arm or the third arm of the frame, respectively. This is especially advantageous when the frame is designed as a thin-walled panel, because the first and / or second spring elements can be connected to the frame in one piece and according to their desired geometry, particularly the geometry of the flexible portions. Preferably, the geometry of the spring elements, particularly the flexible portions, can be stamped or laser-cut, which facilitates the manufacture of the relevant components.

[0031] In a preferred embodiment, the lengths of the first flexible portion and / or the second flexible portion are chosen such that the ratio of the mechanical resonant frequencies of the frame relative to the two tilting axes is between 1.3 and 1.8, particularly between 1.4 and 1.7, and especially 1.5. Preferably, the resonant frequencies relate not only to the frame but also to the assembly of the frame and optical elements. In other words, preferably, there are two resonant frequencies, one relating to rotational motion about one of the two tilting axes and the other relating to rotational motion about the other of the two tilting axes. The ratio between these frequencies is within a specific range.

[0032] The applicant's research has shown that the design of the first and second spring elements, having first and second flexible portions extending substantially perpendicular to the second and third arms of the frame, is well-suited for achieving a specified resonant frequency ratio. Preferably, at least the frame has a higher resonant frequency relative to an axis extending along the direction of the optical element than relative to an axis extending transversely to the optical element, wherein the two axes intersect in a pivot joint.

[0033] In particular, the length of the first flexible portion is between 0.2 and 0.7 times the length of the second arm relative to its main extension direction, and / or the length of the second flexible portion is between 0.2 and 0.7 times the length of the third arm relative to its main extension direction. The applicant's research also shows that the aforementioned length range is particularly advantageous for designing the first and second flexible portions, as the desired dynamic characteristics of the frame and the optical elements held therein can be achieved, particularly in the form of the aforementioned ratio between the resonant frequencies around the two tilt axes.

[0034] In another preferred embodiment, the spring structure includes a first spring element and a second spring element, wherein the first spring element includes a first flexible portion connecting a second arm of the frame to the carrier, and wherein the second spring element includes a second flexible portion connecting a third arm of the frame to the carrier. The first flexible portion extends perpendicular to the main extension direction of the second arm of the frame, and the second flexible portion extends perpendicular to the main extension direction of the third arm of the frame.

[0035] The first and second flexible portions can each be designed as bending beams that deform due to the force of the actuator and thereby exert a restoring force on the frame. Preferably, the frame includes a gap between the ends of the second and third arms. Within the scope of the invention, each spring element includes other components in addition to its flexible portion, such as a base, which is directly or indirectly connected to the carrier; and / or, for example, a connection between the respective flexible portion and the base.

[0036] Preferably, the first flexible portion is attached to the end of the second arm of the frame, particularly to a protrusion of the second arm that extends at least partially transversely and / or perpendicularly to the main extension direction of the second arm. Additionally or alternatively, the second flexible portion is attached to the end of the third arm of the frame, particularly to a protrusion of the third arm that extends at least partially transversely and / or perpendicularly to the main extension direction of the third arm. The protrusion can be considered as part or components of the second and third arms of the frame, respectively projecting toward the gap located between the second and third arms.

[0037] Preferably, the first flexible portion and / or the second flexible portion are beams, which are particularly integrally connected to the second arm or the third arm of the frame, respectively. As described above in conjunction with another embodiment, the flexible portion can be integrally connected to the frame, which can provide advantages during manufacturing.

[0038] In a preferred embodiment, the lengths of the first and / or second flexible portions are chosen such that the ratio of the mechanical resonant frequencies of the frame relative to the two tilting axes is between 0.9 and 1.1, particularly between 0.97 and 1.03, and especially 1. In other words, preferably there are two resonant frequencies, one relating to rotational motion about one of the two tilting axes and the other relating to rotational motion about the other of the two tilting axes. The ratio between these frequencies is within a specific range. A particular advantage of this embodiment is that the ratio of the resonant frequencies can be within a specific range, and this can be achieved through the simple geometry of the flexible portions, particularly by designing them as beams.

[0039] In a preferred embodiment, the length of the first flexible portion is between 0.05 and 0.3 times the distance between the second and third arms, particularly between 0.1 and 0.2 times. Attached Figure Description

[0040] Figure 1 A schematic top view of an embodiment of a carrier device according to the invention for tilting an optical element, particularly in the form of a flat transparent plate, about two axes is shown. Figure 2 It shows Figure 1 A schematic cross-sectional view of the optical device shown; Figure 3A perspective top view of another embodiment of the optical device according to the present invention is shown; Figure 4 It shows Figure 3 A top view of an optical device, in which the frame supporting the optical elements has been removed to show the position of the magnets and coils of the device's actuator; Figures 5A-5D A schematic top view of different embodiments of an optical device according to the present invention is shown, wherein actuators and optical elements are arranged on one side of the pivot joint of the device; Figure 6 A schematic top view of yet another embodiment of the optical device according to the present invention is shown; Figures 7A-7C A schematic top view of different embodiments of an optical device according to the present invention is shown, wherein actuators and optical elements are arranged on different sides of the pivot joint of the device; Figure 8 A schematic top view of another embodiment of an optical device for tilting optical elements according to the present invention is shown, wherein the virtual triangle spanned by the coil center and the pivot point includes a defined area relative to the area of ​​the aperture; and Figure 9 A top view of a frame according to an embodiment of an optical device based on the present invention is shown; Figure 10 A schematic top view of another embodiment of a carrier device for tilting optical elements according to the present invention is shown.

[0041] Figure 11 It shows that according to Figure 10 A three-dimensional top view of an embodiment; Figure 12 A schematic top view of another embodiment of a carrier device for tilting optical elements according to the present invention is shown; Figure 13 It shows that according to Figure 12 A three-dimensional top view of an embodiment. Detailed Implementation

[0042] Figure 1 An embodiment of an optical device 1 for tilting an optical element 2 is shown, wherein the device 1 includes a carrier 4 and a frame member 5 for holding the optical element 2. The optical element 2 is preferably designed as a transparent plate 2 (e.g., a glass plate) having two opposing planes and parallel surfaces 2a, 2b (see [link to documentation]). Figure 3(Details omitted). The optical axis 3 of the device extends perpendicularly to the carrier 4, and particularly perpendicularly to the optical element (when it is in a non-tilted state). In a preferred embodiment, the carrier 4 may be a printed circuit board (PCB). The space occupied by the carrier 4 may be approximately 35 x 35 mm². Furthermore, the optical element / glass 2 may have a space occupied by 20.5 x 20.5 mm². In an embodiment where the aperture CA of the optical element is 18 x 16 mm², the space occupied by the optical element 2 may even be less than 20.5 x 20.5 mm². The frame 5 is supported on the carrier via a single pivot joint 6, which allows the frame 5 and the optical element 2 connected thereto to pivot about two axes A, A', both of which pass through the pivot joint 6. Furthermore, via the pivot joint 6, the frame 5 includes a fixed position at the pivot joint 6 in a direction parallel to the optical axis 3 (also referred to as the z-direction). This makes it possible to suppress a parasitic third mode (piston mode), in which the frame and thus the optical element move back and forth in the z-direction. In addition, the device 1 includes a spring structure 7 that connects the frame 5 to the carrier 4 so as to allow the frame 5 and the optical element 2 to tilt relative to the carrier about the two axes A, A'.

[0043] like Figure 1 As shown, the carrier 4 may include a first leg 41 having a first end segment and an opposing second end segment, a second leg 42 projecting from the first end segment, and a third leg 43 projecting from the second end segment. The second leg 42 and the third leg 43 each include a free end, such that these three legs define a recess 44 of the carrier 4 for light L to pass through (see [reference]). Figure 2 The optical element 2 is arranged in front of or at least partially in the recess 44. Therefore, the carrier 4 basically includes a C-shaped form.

[0044] Specifically, frame 5 is connected to a first leg 41 of the frame on one side via a pivot joint 6. On the opposite side, spring structure 7 connects the frame to a second leg 42 and a third leg 43. In particular, spring structure 7 includes a first spring element 73, which may be a meandering spring element 73. Similarly, a second spring element 74 included in spring structure 7 connects frame 5 to the third leg 43. The second spring element 74 may also be a meandering spring element 74.

[0045] Furthermore, the pivot joint 6 is connected to the first leg 41 of the carrier 4 via a first support 60. Preferably, the first support is an SMD support, which is soldered to a pad on the carrier 4. Figure 2 As shown in the schematic cross-sectional view, the support column 60 provides a defined distance D between the carrier 4 and the frame 5.

[0046] In a similar manner, the first spring element 73 is connected to the second leg 42 of the carrier via the second post 71, and the second spring element 74 is connected to the third leg 43 of the carrier via the third post 72. Again, here, the posts 71 and 72 can be SMD posts that are respectively soldered to pads on the carrier 4.

[0047] Furthermore, the pivot joint 6 is arranged outside the light-transmitting aperture CA of the optical element 2; that is, the pivot joint 6 is arranged further outward in the lateral direction extending perpendicular to the optical axis 3 than the contour 8 defining the light-transmitting aperture CA of the optical element 2 defined by the frame 5. In particular, the contour 8 of the light-transmitting aperture CA includes at least two segments 80, 82 connected by an intermediate segment 81, which extends obliquely relative to the at least two segments 80, 82. Specifically, as... Figure 1 As shown, the aperture CA may include four such inclined intermediate sections that define the corner regions of the profile 8 of the aperture CA.

[0048] To tilt the frame 5 and thus the optical element 2, the optical device 2 includes an actuator configured to generate a force parallel to the optical axis 3 to pivot the frame 5. By pivoting the frame 5 and the optical element 2 connected thereto, light passing through the optical element 2 can... Figure 3 The example in the details shows the offset by the quantity Δx.

[0049] Preferably, in Figure 1 In the illustrated embodiment, the actuator includes a first magnet M1 and a second magnet M2, as well as a first coil C1 and a second coil C2, wherein the first magnet M1 faces the first coil C1 in the direction of the optical axis 3, and wherein the second magnet M2 faces the second coil C2 in the direction of the optical axis 3. Specifically, the first magnet M1 and the second magnet M2 are respectively arranged on the frame 5, while the first coil C1 and the second coil C2 are arranged on the carrier 4. Alternatively, the positions of the corresponding magnets M1, M2 and their associated coils C1, C2 can be interchanged. In particular, in Figure 1 In the illustrated embodiment, the first coil C1 is integrated into the second leg 42, and the second coil C2 is integrated into the third leg 43. Preferably, magnets M1 and M2 are magnetized in a direction parallel to the optical axis 3. Therefore, due to the corresponding relative magnets M1 and M2, the current flowing through the corresponding coils C1 and C2 generates a Lorentz force (depending on the current direction in the corresponding coils C1 and C2). By controlling the current flowing through coils C1 and C2, the frame 5 and optical element 2 can be pivoted in a controlled manner about axis A and / or axis A', thereby achieving the desired pixel offset vector Δx in the x and y directions (see, for example, Figure 1 Or 3).

[0050] in particular, Figure 1The illustrated embodiment arranges magnets M1 and M2, coils C1 and C2, and optical element 2 on the same side of a single pivot joint 6. This configuration is also shown in… Figures 5A to 5D In China, especially Figure 5D It shows the corresponding Figure 1 The illustrated embodiment shows the configuration of magnets M1 and M2, coils C1 and C2, and optical element 2. Here, the first coil C1 extends along the first edge 21c of the optical element 2, and the second coil C2 extends along the opposite second edge 22c of the optical element 2, and a single pivot joint 6 is arranged on the carrier 4 at the center of the third edge 23c of the optical element 2, which connects the first edge 21c and the second edge 22c.

[0051] Figure 2 Combination Figure 3 It shows Figure 1 An alternative embodiment, wherein coils C1 and C2 are arranged at right angles, instead of as shown Figure 1 As in the embodiments, they are parallel and opposite (see also) Figure 5D ). Figure 2 and Figure 3 The configuration is shown schematically. Figure 5A Accordingly, a first coil C1 extends along a first edge 21 of the optical element 2, and a second coil C2 extends along an adjacent second edge 22 of the optical element 2, wherein the first edge and the second edges 21, 22 define a corner region 23 of the optical element 2, and a single pivot joint 6 is arranged on the carrier 4 at a second corner region 24 of the optical element 2, which is diagonally opposite to the first corner region 23.

[0052] In addition, with Figure 1 compared to, Figure 2 and Figure 3 The embodiments do not include a C-shaped carrier, but instead include an annular frame that surrounds a through-hole 45 for light to pass through.

[0053] Although Figure 1 In the illustrated embodiment, the frame 5 may have an annular shape, particularly providing a light-transmitting aperture CA with an inclined corner region 81, and connecting to the C-shaped carrier at three points (i.e., to the two opposing supports 71, 72 connected to the corresponding spring elements 73, 74 and the support 60 of the pivot joint 6), but Figure 2 and Figure 3The frame 5 of the illustrated embodiment includes an alternative design. Here, the frame 5 is connected to the carrier 4 via a single pivot joint 6 and via another support column 500, which is arranged diagonally opposite to the pivot joint 6. The support column 500 is connected to a spring structure 7, which includes a connecting portion 501 connected to the support column 500 and a support column 502 integrally connected to the frame 5. To form the spring structure 7, the frame 5 is separated from the spring structure 7 by an elongated slot 503 extending along the connecting portion 501 and the support column 502. The end of the support column 502 is integrally connected to the frame 5 at a corner of the frame 5. The support column 502 extends parallel to the first coil C1.

[0054] Figure 5B An alternative configuration of coils C1, C2, magnets M1, M2 and optical element 2 is shown, wherein these components are also arranged substantially all on one side of a single pivot joint 6, wherein the first coil C1 and the second coil C2 extend successively along the first edge 21a of the optical element 2, and the single pivot joint 6 is arranged on the carrier 4 at the opposite second edge 22a of the optical element 2.

[0055] Figure 5C It shows the relationship with Figure 5D Compared to an alternative configuration that includes an additional third coil C3 arranged on the carrier 4, the embodiment described herein... Figure 5C In this optical device 1, a first coil C1 extends along a first edge 21b of the optical element 2, and a second coil C2 extends along an opposing second edge 22b of the optical element 2. In addition to a third coil C3, the optical device 1 includes a third magnet M3 disposed on a frame 5 (not shown) and facing the third coil C3 in the direction of the optical axis 3, wherein the third coil C3 extends along a third edge 23b of the optical element 2, which is adjacent to the first edge 21b and the second edge 22b. Here, a single pivot joint 6 is disposed on the carrier 4 at the center of a fourth edge 24b of the optical element 2, which is opposite to the third edge 23b and adjacent to the first edge 21b and the second edge 22b of the optical element 2.

[0056] Figure 6 Another configuration is shown, wherein a first coil C1 extends along a first edge 21d of the optical element 2, and a second coil C2 extends along an adjacent second edge 22d of the optical element 2, the first edge 21d and the second edge 22d defining a corner region 23d of the optical element 2, and wherein a single pivot joint 6 is arranged on the carrier 4 at the corner region 23d of the optical element 2.

[0057] also, Figures 7A-7CA further configuration is shown, in which coils C1, C2 (and especially C3) and corresponding magnets M1, M2, M3 are arranged on one side of a single pivot joint 6, while optical element 2 is arranged on the other side of a single pivot joint 6.

[0058] In particular, Figure 7A In the first coil C1, the first coil C1 extends along the first edge 401 of the carrier 4, and the second coil C2 extends along the adjacent second edge 402 of the carrier 4, wherein the first edge 401 and the second edge 402 define a corner region 403 of the carrier 4, and wherein a single pivot joint 6 is arranged at the corner region 403 of the carrier 4.

[0059] In particular, Figure 7B In the carrier 4, the first coil C1 and the second coil C2 extend obliquely relative to the first edge 401a of the carrier 4, and a single pivot joint 6 is arranged at the first edge 401a of the carrier 4.

[0060] In particular, Figure 7C In the optical device 1, a first coil C1 extends parallel to the first edge 401b of the carrier 4, and a second coil C2 extends perpendicular to the first edge 401b of the carrier 4. The optical device 1 includes a third coil C3 disposed on the carrier 4 and a third magnet M3 disposed on the frame 5 facing the third coil C3 in the direction of the optical axis 3. The third coil C3 extends perpendicular to the first edge 401b of the carrier 4, and at least one pivot joint 6 is disposed on the carrier 4 at the first edge 401b of the carrier 4. Note that, for the sake of brevity, Figure 6 , 5A Magnets are not depicted in -5D and 7A-7C. However, their positions can be inferred from the positions of coils C1, C2, and C3, because coils C1, C2, and C3 are perpendicular to optical element 2 (i.e., perpendicular to...). Figure 6 , 5A The optical axis 3 of the drawing planes (-5D, 7A-7C) is arranged opposite to the corresponding magnets M1, M2, and M3 respectively.

[0061] In addition, Figures 7A-7C In the actuator configurations shown, the positions of the corresponding magnets M1, M2 (and especially M3) and their associated coils C1, C2, C3 can be interchanged. In particular, each configuration has its own specific transfer function that converts the current in the coils C1, C2, C3 into motion about two tilting axes A and A'.

[0062] Furthermore, control circuitry for controlling the application of current to the respective coils C1, C2 (and especially C3) can be provided or can be provided, for example, via connector 9 (see, for example). Figure 1It is connected to carrier 4. The corresponding energy source can also be connected to the device in an appropriate manner.

[0063] In addition, according to Figure 8 In the embodiment of the optical device shown, the centers A1, A2 of the single pivot joint 6 and the first coil and the second coils C1, C2 define a virtual triangle T, which includes an area of ​​at least 25% of the aperture area, preferably at least 35% of the aperture area, and preferably at least 50% of the aperture CA area of ​​the optical element 2.

[0064] also, Figure 9 A top view of a frame 5 according to a preferred embodiment of an optical device 1 according to the present invention is shown. Accordingly, the frame 5 includes a first arm 50 connected to a single pivot joint 6 via a support 51, a second arm 52 integrally connected to a first end of the first arm 50, and a third arm 53 integrally connected to a second end of the first arm 50. Preferably, the widths of the second arm 52 and the third arm 53 in the plane of extension of the optical element are each greater than the width of the first arm 50. Furthermore, in particular, the spring structure 7 includes a first meandering spring element 73 and a second meandering spring element 74, wherein the first meandering spring element 73 connects the end of the second arm 52 of the frame 5 to the carrier 4, and wherein the second meandering spring element 74 connects the end of the third arm 53 of the frame 5 to the carrier 4. More preferably, the frame 5 includes a gap 54 between the ends of the second and third arms 52 and 53.

[0065] In summary, the present invention offers the advantage of eliminating the need for actuators to be arranged at least along one side of the optical element 2, thereby improving the applicability of the device in compact installation spaces. Furthermore, the piston movement pattern of the frame 5 and the optical element 2 can be suppressed because the pivot joint 6 fixes the frame in the z-direction.

[0066] Figure 10 A device 1 for pixel offset is shown, which is similar to Figure 1 The illustrated embodiment includes a carrier 4 on which a frame 5 is disposed via a pivot joint 6. The pivot joint 6 is disposed outside the light-transmitting aperture of the optical element 2 and is held by the frame 5. An actuator (not discussed in detail here) is configured to generate a force parallel to the optical axis 3 to pivot the frame 5. The pivot joint 6 allows the frame 5 to pivot / tilt together with the optical element 2 about two axes A and A'. Importantly, the tilting axes A and A' intersect outside the light-transmitting aperture of the optical element 2.

[0067] Spring structure 7 connects frame 5 to carrier 4 and includes a first spring element 75 and a second spring element 76. The first spring element 75 connects the second arm 52 of frame 5 to carrier 4. The second spring element 76 connects the third arm 53 of frame 5 to carrier 4. The second arm 52 of frame 5 extends along the main extension direction 55, and the third arm 53 of frame 5 extends along the main extension direction 56. The second and third arms 52 and 53 each have a length L0, which refers to the outer edge of the second and third arms relative to their main axes 55 and 56.

[0068] The first spring element 75 includes a first flexible portion 77, and the second spring element 76 includes a second flexible portion 78. Each of them has a length L1, which is between 0.2 and 0.7 times the length L0 of the second and third arms relative to their main extension directions. The first flexible portion 77 and the second flexible portion 78 extend substantially parallel to the second arm 52 and the third arm 53, respectively.

[0069] The lengths of the first flexible portion 77 and the second flexible portion 78 within a specified range allow the ratio of the mechanical resonant frequencies of the frame relative to the two tilting axes A and A' to be set between 1.3 and 1.8, and particularly to 1.5. The resonant frequency of rotation about axis A' is higher than the resonant frequency of rotation about axis A.

[0070] Figure 11 It shows that according to Figure 10 A three-dimensional view of device 1. Therefore, for Figure 10 The corresponding explanation applies.

[0071] Figure 12 Another device 1 is shown, which is also used for pixel offset and is similar to... Figure 10 and Figure 11 The illustrated embodiment includes a carrier 4 on which a frame 5 is mounted via a pivot joint 6. The pivot joint 6 is positioned outside the light-transmitting aperture of the optical element 2 and is held by the frame. An actuator (not shown in detail) is configured to generate a force parallel to the optical axis 3 to pivot the frame 5. The pivot joint 6 allows the frame 5 to pivot / tilt together with the optical element 2 about two axes A and A'. Importantly, the tilting axes A and A' intersect outside the light-transmitting aperture of the optical element 2.

[0072] Spring structure 7 connects frame 5 to carrier 4 and includes a first spring element 75 and a second spring element 76. The first spring element 75 connects the second arm 52 of frame 5 to carrier 4. The second spring element 76 connects the third arm 53 of frame 5 to carrier 4. The second arm 52 of frame 5 extends along a main extension direction 55, and the third arm 53 of frame 5 extends along a main extension direction 56. The second arm 52 and the third arm 53 are spaced apart from each other by a distance L2, which refers to the distance between the outer edges of the second arm 52 and the third arm 53.

[0073] and Figure 10 and Figure 11 Similar to the device 1 shown, the spring structure 7 includes a first spring element 75 and a second spring element 76, wherein the first spring element 75 includes a first flexible portion 77 connecting the second arm 52 of the frame 5 to the carrier 4, and wherein the second spring element 76 includes a second flexible portion 78 connecting the third arm 53 of the frame 5 to the carrier 4. The first flexible portion 77 extends perpendicular to the main extension direction 55 of the second arm 52 of the frame 5, and the second flexible portion 78 extends perpendicular to the main extension direction 56 of the third arm 53 of the frame 5.

[0074] The first and second flexible portions 77 and 78 are substantially equal in length, corresponding to L3, which is between 0.05 and 0.3 times the measurable distance L2 between the second arm 52 and the third arm 53. In particular, these lengths L3 are chosen so that the ratio of the mechanical resonant frequencies of the frame relative to the two tilting axes A and A' is between 0.9 and 1.1, and in particular can be 1.

[0075] A first flexible portion 77 is attached to a protrusion 57 at the end of the second arm 52 of the frame 5, extending perpendicularly and / or laterally relative to the main extension direction 55. Furthermore, a second flexible portion 78 is attached to a protrusion 58 at the end of the third arm 53 of the frame 5, extending perpendicularly and / or laterally relative to the main extension direction 56 of the third arm 53.

Claims

1. An optical device (1) for carrying an optical element (2), particularly for pixel offset, said optical device (1) comprising: Optical axis (3). Carrier (4), The frame (5) is supported on the carrier (4) by at least one pivot joint (6), allowing the frame (5) to pivot about two axes (A, A'). An optical element (2) is connected to the frame (5), the optical element including a light-transmitting aperture (CA). The spring structure (7) that connects the frame (5) to the carrier (4), and Actuators (M1, M2, C1, C2) are configured to generate a force parallel to the optical axis (3) to pivot the frame (5). in The pivot joint (6) is arranged outside the light aperture (CA) of the optical element (2).

2. The optical device according to claim 1, wherein, The actuator includes a first magnet (M1) and a second magnet (M2), a first coil (C1) and a second coil (C2), wherein the first magnet (M1) faces the first coil (C1) in the direction of the optical axis (3), and the second magnet (M2) faces the second coil (C2) in the direction of the optical axis (3). - The first magnet (M1) and the second magnet (M2) are respectively arranged on the frame (5), and the first coil (C1) and the second coil (C2) are arranged on the carrier (4), or - The first magnet (M1) and the second magnet (M2) are respectively arranged on the carrier (4), and the first coil (C1) and the second coil (C2) are arranged on the frame (5).

3. The optical device according to claim 1 or 2, wherein, The light aperture (CA) includes a profile (8) comprising at least two segments (80, 82) connected by an intermediate segment (81) that extends obliquely relative to the at least two segments (80, 82).

4. The optical device according to any one of the preceding claims, wherein, The at least one pivot joint (6) is a single pivot joint (6).

5. The optical device according to any one of the preceding claims, wherein, The carrier (4) includes a first leg (41) having a first end section and an opposing second end section, and wherein the carrier (4) includes a second leg (42) protruding from the first end section and a third leg (43) protruding from the second end section, wherein the second leg and the third leg (42, 43) each include a free end.

6. The optical device according to claim 5, wherein, The first coil (C1) is arranged on the second leg (42), and the second coil (C2) is arranged on the third leg (43), and the pivot joint (6) is arranged on the first leg (41).

7. The optical device according to claim 6, wherein, The pivot joint (6) is connected to the first leg (41) of the carrier (4) via the first support (60).

8. The optical device according to claim 7, wherein, The support column (60) is an SMD support column welded to the carrier (4), or the support column is integrally formed with the frame (5) and / or the carrier (4).

9. The optical device according to claim 2 or according to any one of claims 3 to 8 relating to claim 2, wherein, The magnets (M1, M2), coils (C1, C2) and optical elements (2) are arranged on the same side of the at least one pivot joint (6).

10. The optical device according to claim 9, wherein, - The first coil (C1) extends along the first edge (21) of the optical element (2), and wherein the second coil (C2) extends along the adjacent second edge (22) of the optical element (2), the first edge and the second edge (21, 22) defining a corner region (23) of the optical element (2), and wherein the at least one pivot joint (6) is disposed on the carrier (4) at the second corner region (24) of the optical element (2), the second corner region (24) being diagonally opposite to the first corner region (23), or - The first coil (C1) and the second coil (C2) extend successively along the first edge (21a) of the optical element (2), and the at least one pivot joint (6) is arranged on the carrier (4) at the opposite second edge (22a) of the optical element (2), or - The first coil (C1) extends along the first edge (21b) of the optical element (2), and the second coil (C2) extends along the opposite second edge (22b) of the optical element (2), and wherein the optical device (1) includes a third coil (C3) disposed on the carrier (4) and a third magnet (M3) disposed on the frame (5) facing the third coil (C3) in the direction of the optical axis (3), wherein the third coil (C3) extends along the third edge (23b) of the optical element (2), the third edge (23b) being adjacent to the first edge and the second edge (21b, 22b), and wherein the at least one pivot joint (6) is disposed on the carrier (4) at the fourth edge (24b) of the optical element (2), the fourth edge (24b) being opposite to the third edge (23b) and adjacent to the first edge and the second edge (21b, 22b) of the optical element (2).

11. The optical device according to any one of claims 1 to 3, 6 to 9, wherein, The first coil (C1) extends along a first edge (21d) of the optical element (2), and wherein the second coil (C2) extends along an adjacent second edge (22d) of the optical element (2), the first edge and the second edge (21d, 22d) defining a corner region (23d) of the optical element (2), and wherein the at least one pivot joint (6) is disposed on the carrier (4) at the corner region (23d) of the optical element (2).

12. The optical device according to any one of claims 1 to 4, wherein, The coils (C1, C2) and the magnets (M1, M2) are arranged on one side of the at least one pivot joint (6), and the optical element (2) is arranged on the other side of the at least one pivot joint (6).

13. The optical device according to claim 12, wherein... - The first coil (C1) extends along the first edge (401) of the carrier (4), and wherein, The second coil (C2) extends along an adjacent second edge (402) of the carrier (4), the first edge and the second edge (401, 402) defining a corner region (403) of the carrier (4), and wherein the at least one pivot joint (6) is disposed at the corner region (403) of the carrier (4), or - The first coil (C1) and the second coil (C2) extend obliquely relative to the first edge (401a) of the carrier (4), and the at least one pivot joint (6) is arranged at the first edge (401a) of the carrier (4), or - The first coil (C1) extends parallel to the first edge (401b) of the carrier (4), and the second coil (C2) extends perpendicular to the first edge (401b) of the carrier (4), and wherein the optical device (1) includes a third coil (C3) disposed on the carrier (4) and a third magnet (M3) disposed on the frame (5) facing the third coil (C3) in the direction of the optical axis (3), wherein the third coil (C3) extends perpendicular to the first edge (401b) of the carrier (4), and wherein the at least one pivot joint (6) is disposed on the carrier (4) at the first edge (401b) of the carrier (4).

14. The optical device according to any one of the preceding claims, wherein, The first magnet and the second magnet (M1, M2) are magnetized parallel to the optical axis (3).

15. The optical device according to any one of the preceding claims, wherein, The carrier (4) is a printed circuit board, wherein, in particular, the first coil and the second coil (C1, C2) are integrated in the printed circuit board.

16. The optical device according to claim 2 or any one of claims 3 to 15 relating to claim 2, wherein, The pivot joint (6) and the centers (A1, A2) of the first coil and the second coil (C1, C2) define a virtual triangle (T) that includes an area of ​​at least 25% of the area of ​​the aperture (CA), preferably at least 35% of the area of ​​the aperture (CA), and more preferably at least 50% of the area of ​​the aperture (CA).

17. The optical device according to any one of the preceding claims, wherein the frame (5) comprises a first arm (50) connected to the pivot joint (6) via a strut (51), a second arm (52) integrally connected to a first end of the first arm (50), and a third arm (53) integrally connected to a second end of the first arm (50), wherein, The second arm and the third arm (52, 53) have a width greater than that of the first arm (50), and the spring structure (7) includes a first meandering spring element (73) and a second meandering spring element (74), wherein the first meandering spring element (73) connects the end of the second arm (52) of the frame (5) to the carrier (4), and wherein the second meandering spring element (74) connects the end of the third arm (53) of the frame (5) to the carrier (4), and wherein the frame (5) includes a gap (54) between the ends of the second arm and the third arm (52, 53).

18. The optical device according to any one of claims 1 to 16, wherein, The spring structure (7) includes a first spring element (75) and a second spring element (76), wherein the first spring element (75) includes a first flexible portion (77) connecting the second arm (52) of the frame (5) to the carrier (4), and the second spring element (76) includes a second flexible portion (78) connecting the third arm (53) of the frame (5) to the carrier (4), wherein the first flexible portion (77) extends substantially parallel to the main extension direction (55) of the second arm (52) of the frame (5), and / or the second flexible portion (78) extends substantially parallel to the main extension direction (56) of the third arm (53) of the frame (5).

19. The optical device according to claim 18, wherein, The first flexible portion (77) is attached to the second arm (52) of the frame (5) in the section between the first arm (50) of the frame (5) and the end of the second arm (52) of the frame (5), and / or wherein the second flexible portion (78) is attached to the third arm (53) of the frame (5) in the section between the first arm (50) of the frame (5) and the end of the third arm (53) of the frame (5).

20. The optical device according to any one of claims 18 or 19, wherein, The first flexible portion (77) and / or the second flexible portion (78) are beams, which are specifically integrally connected to the second arm (52) of the frame (5) or the third arm (53) of the frame (5), respectively.

21. The optical device according to any one of claims 18 to 20, wherein, The lengths (L1) of the first flexible portion (77) and / or the second flexible portion (78) are selected such that the ratio of the mechanical resonant frequencies of the frame, in particular the optical element (2), about the two tilting axes (A, A') is between 1.3 and 1.8, particularly between 1.4 and 1.7, and especially 1.

5.

22. The optical device according to any one of claims 18 to 21, wherein, The length (L1) of the first flexible portion (77) is between 0.2 and 0.7 times the length (L0) of the second arm (52) relative to its main extension direction (55), and / or the length (L1) of the second flexible portion (78) is between 0.2 and 0.7 times the length (L0) of the third arm (53) relative to its main extension direction (56).

23. The optical device according to any one of claims 1 to 16, wherein, The spring structure (7) includes a first spring element (75) and a second spring element (76), wherein the first spring element (77) includes a first flexible portion connecting the second arm (52) of the frame (5) to the carrier (4), and wherein the second spring element (76) includes a second flexible portion (78) connecting the third arm (53) of the frame (5) to the carrier (4), wherein the first flexible portion (77) extends substantially perpendicular to the main extension direction (55) of the second arm (52) of the frame (5), and wherein the second flexible portion (78) extends substantially transversely to the main extension direction (56) of the third arm (53) of the frame (5).

24. The optical device according to claim 23, wherein, The first flexible portion (77) is attached to the end of the second arm (52) of the frame (5), particularly to a protrusion (57) of the second arm (52) that extends at least partially perpendicular to the main extension direction (55) of the second arm (52), and / or wherein, The second flexible portion (78) is attached to the end of the third arm (53) of the frame (5), particularly to the protrusion (58) of the third arm (53), which extends at least partially perpendicular to the main extension direction (56) of the third arm (53).

25. The optical device according to any one of claims 23 or 24, wherein, The first flexible portion (77) and / or the second flexible portion (78) are beams, which are specifically integrally connected to the second arm (52) of the frame (5) or the third arm (53) of the frame (5), respectively.

26. The optical device according to any one of claims 23 to 25, wherein, The lengths (L3) of the first flexible portion (77) and / or the second flexible portion (78) are selected such that the ratio of the mechanical resonant frequencies of the frame (5), particularly the optical element (2), about the two tilting axes (A, A') is between 0.9 and 1.1, particularly between 0.97 and 1.03, and especially 1.

27. The optical device according to any one of claims 23 to 26, wherein, The length (L3) of each of the first flexible portion (77) and / or the second flexible portion (78) is between 0.05 and 0.3 times, particularly between 0.1 and 0.2 times, the distance (L2) between the second arm (52) and the third arm (52).

Images