Scanning actuator and scanning display module

Abstract

The utility model discloses a scanning actuator and a scanning display module. The scanning actuator comprises a fast axis actuating part, an adapter and a slow axis actuating part which are sequentially arranged from back to front. The left side and the right side of the front end of the fast shaft actuating part are hinged to the adapters respectively. The rear end of the slow shaft actuating part is connected with the adapter; when the scanning actuator vibrates, force in the front-back direction can be transmitted between the fast axis actuating part and the slow axis actuating part in a hinged mode, transmission of torsional force is limited, and therefore the coupling problem between the fast axis and the slow axis is relieved, the phenomenon that odd-row vertical lines and even-row vertical lines of a scanning track are split is avoided, and the projection display quality is improved.

Description

Technical Field

[0001] The utility model relates to the field of projection display, in particular to a scanning actuator and a scanning display module. Background Art

[0002] The imaging principle of fiber scanning display (FSD) technology is to use an actuator to drive the optical fiber to move along a predetermined two-dimensional scanning trajectory, and modulate the light source to output the light corresponding to each pixel of the image to be displayed. Then, the light corresponding to each pixel of the image to be displayed is projected one by one onto the projection surface through the optical fiber to form a projection picture.

[0003] A grid-type FSD scanner generally refers to a device that realizes projection display through grid-type scanning. Generally speaking, the fast axis of a grid-type FSD scanner is directly connected to the slow axis. No matter the fast axis is located at the tail, end, or integral with the slow axis, it is difficult to avoid the influence of the reaction force generated by the large-amplitude vibration of the slow axis on the vibration characteristics of the fast axis, thereby leading to the coupling problem of the fast and slow axes. When displaying a grid image, the odd and even vertical lines of the scanning trajectory will have a fork problem. Utility Model Content

[0004] The purpose of the utility model is to provide a scanning actuator and a scanning display module, which are used to alleviate the influence of the reaction force generated by the large-amplitude vibration of the slow axis of the grid-type FSD scanner existing in the prior art on the fast-axis vibration characteristics, resulting in the fast-slow axis coupling problem.

[0005] In order to achieve the above-mentioned utility model object, the first aspect of the utility model embodiment provides a scanning actuator, including a fast-axis actuator, a transition piece and a slow-axis actuator arranged in sequence from the back to the front;

[0006] The left and right sides of the front end of the fast-axis actuator are respectively hinged to the adapter; the rear end of the slow-axis actuator is connected to the adapter; when the scanning actuator vibrates, the fast-axis actuator and the slow-axis actuator are hinged to allow force along the front-to-back direction to be transmitted between them and to limit the transmission of torsional force.

[0007] Optionally, the adapter is fixed to the base in a hinged manner, so that the adapter can be twisted on the vibration plane of the fast-axis actuator and the adapter is restricted from twisting in other directions.

[0008] Optionally, limiting the adapter from twisting in other directions includes limiting the adapter from twisting on a vibration plane of the slow-axis actuator.

[0009] Optionally, the articulation between the adapter and the base is a rotational articulation.

[0010] Optionally, the hinged manner between the left and right sides of the front end of the fast-axis actuator and the adapter is point-contact hinging.

[0011] Optionally, the rear end of the fast-axis actuator is connected to the substrate.

[0012] Optionally, the fast-axis actuator includes a first piezoelectric actuator and a second piezoelectric actuator which are symmetrically arranged left and right; the first piezoelectric actuator and the second piezoelectric actuator can perform synchronous reverse telescoping in the front-rear direction; the first piezoelectric actuator and the second piezoelectric actuator are respectively hinged to the adapter.

[0013] Optionally, the fast-axis actuator includes a base body and a third piezoelectric actuator and a fourth piezoelectric actuator which are symmetrically arranged left and right on the base body.

[0014] Optionally, the slow-axis actuator is a piezoelectric sheet structure.

[0015] A second aspect of the embodiments of the present invention provides a scanning display module, including an optical fiber and the scanning actuator as described in the first aspect, and the optical fiber is fixed to the front end of the slow-axis actuator.

[0016] One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:

[0017] In the solution of the embodiments of the present invention, the left and right sides of the front end of the fast-axis actuator are respectively hinged to the adapter; the rear end of the slow-axis actuator is connected to the adapter; when the scanning actuator vibrates, the force in the front-rear direction can be transmitted between the fast-axis actuator and the slow-axis actuator in a hinged manner, and the transmission of torsional force is restricted, thereby alleviating the coupling problem between the fast and slow axes, avoiding the splitting of the odd and even vertical lines of the scanning trajectory, and improving the projection display quality. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts:

[0019] Figure 1 It is a top view of the scanning actuator provided by the embodiments of the present invention;

[0020] Figure 2 It is a side view of the scanning actuator provided by the embodiments of the present invention;

[0021] Figure 3 andFigure 4 Schematic diagram of the hinge connection between the adapter and the substrate provided by the embodiment of the present invention;

[0022] Figure 5 Top view of a possible structure of the fast-axis actuator provided by the embodiment of the present invention. Detailed implementation manners

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0024] As Figure 1 and Figure 2 shown, the embodiment of the present invention provides a scanning actuator, which includes a fast-axis actuator 101, an adapter 102, and a slow-axis actuator 103 arranged in sequence along the direction from back to front. The rear end of the slow-axis actuator 103 is connected to the adapter 102; the left and right sides of the front end of the fast-axis actuator 101 are respectively hinged to the adapter 102, such as the positions A and B in Figure 1 ; under the drive of a drive signal, the front end of the fast-axis actuator 101 vibrates at a high frequency in the horizontal left-right direction, and under the drive of the drive signal, the front end of the slow-axis actuator 102 vibrates at a low frequency in the vertical direction; during the vibration of the scanning actuator, the force in the front-back direction can be transmitted between the fast-axis actuator 101 and the slow-axis actuator 103 through the hinged manner, and the transmission of torsional force is restricted.

[0025] In the above solution, since a flexible hinge is added between the fast-axis actuator 101 and the adapter 102, only the force in the front-back direction (axial direction) is transmitted, and the torsional force is not transmitted, thereby alleviating the coupling problem between the fast and slow axes (that is, between the fast-axis actuator 101 and the slow-axis actuator 103), avoiding the splitting of the odd and even vertical lines of the scanning trajectory, and further improving the projection display quality.

[0026] In the embodiment of the present invention, as Figure 3 and Figure 4 shown, the adapter 102 is fixed to the substrate 104 by a hinged manner, so that the adapter 102 can twist on the vibration plane of the fast-axis actuator 101, and the twisting of the adapter 102 in other directions is restricted. The hinged manner is as Figure 3As shown in C. Among them, the base 104 includes a housing encapsulating the scanning actuator and a base for mounting the scanning actuator. By means of hinging, the adapter 102 can only twist on the vibration plane of the fast-axis actuator part 101, restricting other directions, especially the vibration plane of the slow-axis actuator part 103. In this way, when the slow-axis actuator part 103 vibrates, the torsional reaction force at the root of the slow-axis actuator 103 is restricted by the connecting hinge and cannot be transmitted to the fast-axis actuator part 101, thereby avoiding the change of the frequency characteristics of the fast-axis actuator part 101 caused by external stress changes and forming fast-slow axis coupling.

[0027] In the above solution, in addition to effectively reducing or eliminating the transmission of the root reaction force to the fast-axis actuator part 101 when the slow-axis actuator part 103 vibrates, it can also reduce the non-horizontal plane torsion transmission of the fast-axis actuator part 101 to the slow-axis actuator part 103 due to device tolerances, thereby reducing or eliminating the vertical line splitting of the scanning trajectory caused by the fast-slow axis coupling problem.

[0028] In the embodiment of the present invention, a pre-tightening screw can also be added to the tail of the fast-axis actuator part 101 to eliminate the end face centering offset caused by processing and assembly errors, increase the pre-tightening force, and improve the output of piezoelectric materials (such as piezoelectric ceramics).

[0029] In the embodiment of the present invention, the hinging method between the left and right sides at the front end of the fast-axis actuator part 101 and the adapter 102 is point-contact hinging, and the rear end of the fast-axis actuator part 101 is connected to the base. The hinging method between the adapter 102 and the base is rotary hinging.

[0030] In the embodiment of the present invention, as Figure 5 shown, the fast-axis actuator part 101 includes a first piezoelectric actuator part 1010 and a second piezoelectric actuator part 1011 which are symmetrically arranged left and right; the first piezoelectric actuator part 1010 and the second piezoelectric actuator part 1011 can perform synchronous reverse telescoping in the front-rear direction, so that the fast-axis actuator part 101 vibrates in the horizontal direction; the first piezoelectric actuator part 1010 and the second piezoelectric actuator part 1011 are respectively hinged to the adapter 102.

[0031] In another possible implementation manner, the fast-axis actuator part 101 includes a base body and a third piezoelectric actuator part and a fourth piezoelectric actuator part which are symmetrically arranged left and right on the base body, and the third piezoelectric actuator part and the fourth piezoelectric actuator part can perform synchronous reverse telescoping in the front-rear direction, so that the fast-axis actuator part 101 vibrates in the horizontal direction.

[0032] In the embodiment of the present invention, the slow-axis actuator part 103 is a piezoelectric sheet structure, including a bimorph structure, a unimorph structure, a piezoelectric stack structure, etc.

[0033] In the specific implementation process, in order to minimize the volume and assembly difficulty of the scanning actuator, a scanning actuator is provided. The adapter of the scanning actuator connects the adapter and the base together through an intermediate beam, and a flexible hinge is formed at the connection between the intermediate beam and the adapter. The two piezoelectric ceramics of the fast-axis actuating part are respectively fixed on both sides and do not contact the intermediate beam.

[0034] The piezoelectric ceramics included in the fast-axis actuator are connected to the adapter through steel balls to form a point-contact spherical hinge. To further simplify the design, the steel balls can also be removed to reduce the contact area between the fast-axis actuating part and the adapter, so as to reduce the equivalent torsional stiffness of the structure at this place and form the effect of an approximate spherical hinge.

[0035] Based on the same inventive concept, an embodiment of the present invention further provides a scanning display module, including an optical fiber and the scanning actuator in the above embodiment. For the setting of the optical fiber, the end face of the slow-axis actuating part fixes the optical fiber, and the optical fiber is not rigidly fixed to the adapter and the fast-axis actuating part.

[0036] The scanning display module in the embodiment of the present invention can be applied to various scenarios, including but not limited to AR (full English name: Augmented Reality; Chinese name: Augmented Reality) devices, laser TVs, laser projectors, vehicle-mounted projections, etc. In these application scenarios, one scanning display module can be used for projection display, or multiple scanning display modules can be used in cooperation for the display or splicing display of multiple pictures. The present invention does not limit this.

[0037] All the features disclosed in this specification, or all the steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any way.

[0038] Any feature disclosed in this specification (including any additional claims, abstract, and drawings), unless specifically stated, can be replaced by other equivalent or similar-purpose alternative features. That is, unless specifically stated, each feature is only an example of a series of equivalent or similar features.

[0039] The present invention is not limited to the foregoing specific implementation manners. The present invention extends to any new feature or any new combination disclosed in this specification, as well as any new method or process step or any new combination disclosed.

Claims

1. A scanning actuator, characterized in that: It includes a fast-axis actuating part, a transition piece and a slow-axis actuating part which are arranged in sequence from the rear to the front; The left and right sides of the front end of the fast-axis actuator are respectively hinged to the adapter; the rear end of the slow-axis actuator is connected to the adapter; when the scanning actuator vibrates, the fast-axis actuator and the slow-axis actuator are hinged to allow force along the front-to-back direction to be transmitted between them and to limit the transmission of torsional force.

2. The scanning actuator according to claim 1, wherein: The adapter is fixed to the base in a hinged manner, so that the adapter can be twisted on the vibration plane of the fast axis actuator and the adapter is restricted from twisting in other directions.

3. The scanning actuator according to claim 2, characterized in that Limiting the adapter from twisting in other directions includes limiting the adapter from twisting on a vibration plane of the slow-axis actuator.

4. The scanning actuator according to claim 2, wherein: The hinge connection between the adapter and the base is a rotary hinge connection.

5. The scanning actuator according to claim 1, wherein: The hinge connection between the left and right sides of the front end of the fast axis actuating portion and the adapter is point contact hinge connection.

6. The scanning actuator according to claim 1, wherein: The rear end of the fast axis actuator is connected to the substrate.

7. The scanning actuator according to claim 1, wherein: The fast axis actuator comprises a first piezoelectric actuator and a second piezoelectric actuator which are symmetrically arranged on the left and right sides; the first piezoelectric actuator and the second piezoelectric actuator can synchronously retract and contract in opposite directions along the front-back direction; the first piezoelectric actuator and the second piezoelectric actuator are respectively hinged to the adapter.

8. The scanning actuator according to claim 1, wherein: The fast axis actuator comprises a substrate, and a third piezoelectric actuator and a fourth piezoelectric actuator which are symmetrically arranged on the substrate.

9. The scanning actuator according to claim 1, wherein: The slow axis actuator is a piezoelectric sheet structure.

10. A scanning display module, characterized in that: The invention comprises an optical fiber and a scanning actuator as claimed in any one of claims 1 to 9, wherein the optical fiber is fixed at the front end of the slow axis actuator.

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