CN111830703A - Scanning actuator, display module and projection display equipment - Google Patents
Scanning actuator, display module and projection display equipment Download PDFInfo
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- CN111830703A CN111830703A CN201910320062.3A CN201910320062A CN111830703A CN 111830703 A CN111830703 A CN 111830703A CN 201910320062 A CN201910320062 A CN 201910320062A CN 111830703 A CN111830703 A CN 111830703A
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- 239000013307 optical fiber Substances 0.000 claims abstract description 32
- 125000006850 spacer group Chemical group 0.000 claims description 5
- 230000003190 augmentative effect Effects 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000007423 decrease Effects 0.000 description 6
- 238000005192 partition Methods 0.000 description 6
- 230000003247 decreasing effect Effects 0.000 description 5
- 239000000835 fiber Substances 0.000 description 5
- 238000002955 isolation Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/103—Scanning systems having movable or deformable optical fibres, light guides or waveguides as scanning elements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Optical Scanning Systems (AREA)
Abstract
The invention discloses a scanning actuator, a display module and projection display equipment, which comprise a first actuating part and a second actuating part which are sequentially connected in the direction from back to front; the first actuating part can drive the second actuating part to vibrate in a first direction, the second actuating part can vibrate in a second direction, and the scanning actuator is a tubular actuator; the inner diameter of the first actuation portion is smaller than the inner diameter of the second actuation portion and/or the outer diameter of the first actuation portion is smaller than the outer diameter of the second actuation portion such that the natural frequency of the first actuation portion is smaller than the natural frequency of the second actuation portion. The scheme is used for reducing the natural frequency of the slow axis actuating part in the optical fiber scanner, increasing the amplitude of the slow axis and being beneficial to the miniaturization of the optical fiber scanner.
Description
Technical Field
The invention relates to the field of scanning imaging, in particular to a scanning actuator, a display module and projection display equipment.
Background
The imaging principle of the optical fiber scanning projection technology is that a scanning optical fiber is driven by an optical fiber scanner to perform the motion of a preset two-dimensional scanning track, the light source is modulated to emit light, namely, the light corresponding to each pixel point of an image to be displayed is modulated, and then the light corresponding to each pixel point of the image to be displayed is projected onto a projection screen one by one through the scanning optical fiber, so that a projection picture is formed.
Currently, fiber optic scanners generally include a light source, a scanning fiber, and a scanning actuator. As shown in fig. 1A and 1B, the scan actuator includes a slow axis 001 and a fast axis 002. According to the requirements of the fiber scanner for different display specifications, such as: grid type scanning which better accords with the imaging rule of a rectangular display image source has different requirements on the frequency of a fast axis and the frequency of a slow axis, and the driving frequency in the direction of the slow axis is lower and is several orders of magnitude lower than that of the fast axis. In the conventional tiled scan actuator or the integrally sintered scan actuator, since the natural frequency of the ceramic is fixed, it is difficult for the slow axis 001 and the fast axis 002 to simultaneously achieve resonance to achieve the maximum vibration amplitude.
Disclosure of Invention
The invention aims to provide a scanning actuator, a display module and projection display equipment, which are used for reducing the natural frequency of a slow axis actuating part in an optical fiber scanner, increasing the amplitude of a slow axis and being beneficial to the miniaturization of the optical fiber scanner.
In order to achieve the above object, a first aspect of embodiments of the present invention provides a scanning actuator including a first actuating portion and a second actuating portion connected in this order in a backward-forward direction; the first actuating part can drive the second actuating part to vibrate in a first direction, the second actuating part can vibrate in a second direction, and the scanning actuator is a tubular actuator; the inner diameter of the first actuation portion is smaller than the inner diameter of the second actuation portion and/or the outer diameter of the first actuation portion is smaller than the outer diameter of the second actuation portion such that the natural frequency of the first actuation portion is smaller than the natural frequency of the second actuation portion.
Optionally, the first actuating portion and the second actuating portion have the same inner diameter, and the outer diameter of the first actuating portion is smaller than the outer diameter of the second actuating portion.
Optionally, the first actuating portion and the second actuating portion have the same outer diameter, and the inner diameter of the first actuating portion is smaller than the inner diameter of the second actuating portion.
Optionally, the outer diameter of the first actuating portion is smaller than the outer diameter of the second actuating portion, and the inner diameter of the first actuating portion is smaller than the inner diameter of the second actuating portion.
Optionally, at least one mass is disposed between the first and second actuating portions.
Optionally, the tubular actuator is a circular tube type actuator or a square tube type actuator.
Optionally, the scanning actuator further comprises a spacer between the first and second actuators.
Optionally, the first actuating portion and the second actuating portion are integrally formed or fixedly connected.
A second aspect of an embodiment of the present invention provides a display module, including a light source, an optical fiber, and the scanning actuator according to the first aspect; the optical fiber is fixed on the second actuating part, one end of the optical fiber is connected with the light source, the other end of the optical fiber exceeds the second actuating part and forms an optical fiber cantilever, and the optical fiber cantilever is driven by the scanning actuator to sweep in a three-dimensional space in a synthetic direction of a first direction and a second direction; the modulated light output by the light source is coupled into the optical fiber and is emitted out through the light-emitting end of the optical fiber cantilever to be used as projection display image light.
A third aspect of the embodiments of the present invention provides a projection display device, which includes one or more sets of display modules as described in the second aspect.
Optionally, the projection display device is a head-mounted augmented reality display device or a head-mounted virtual reality display device.
Optionally, the projection display device is a projector or a projection television.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
in the scheme of the embodiment of the invention, the inner diameter and/or the outer diameter of the first actuating part are/is changed to enable the inner diameter of the first actuating part to be smaller than the inner diameter of the second actuating part and/or the outer diameter of the first actuating part to be smaller than the outer diameter of the second actuating part, so that the natural frequency of the first actuating part is reduced to enable the natural frequency of the first actuating part to be smaller than the natural frequency of the second actuating part, the requirement of the slow axis driving frequency is met, and the slow axis amplitude is increased.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise:
FIGS. 1A and 1B are schematic diagrams of a scanning actuator in the prior art;
FIG. 2A is a schematic cross-sectional view of a scanning actuator according to an embodiment of the present invention;
FIG. 2B is a schematic cross-sectional view of another possible scanning actuator provided by an embodiment of the invention;
FIG. 2C is a schematic cross-sectional view of another possible scanning actuator provided by an embodiment of the invention;
FIG. 2D is a schematic diagram of a cross-section of a square tube actuator according to an embodiment of the present invention;
fig. 3A and fig. 3B are schematic structural diagrams of a mass block according to an embodiment of the present invention;
fig. 4A to fig. 5C are schematic diagrams illustrating different structures of the isolation portion according to the embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2A-2C, fig. 2A-2C are schematic cross-sectional views of a scanning actuator according to an embodiment of the present invention, wherein a hatched portion represents a hollow portion, and the scanning actuator includes a first actuating portion 101 and a second actuating portion 102 sequentially connected in a back-to-front direction; the first actuator 101 can drive the second actuator 102 to vibrate in a first direction, the second actuator 102 can vibrate in a second direction, the inner diameter of the first actuator 101 is smaller than the inner diameter of the second actuator 102, and/or the outer diameter of the first actuator 101 is smaller than the outer diameter of the second actuator 102, such that the natural frequency of the first actuator 101 is smaller than the natural frequency of the second actuator 102.
The first actuating portion 101 can drive the second actuating portion 102 to move along a first direction under the excitation of an electric signal, the second actuating portion 102 can vibrate in a second direction under the excitation of the electric signal, the first direction and the second direction are two intersecting directions, and optionally, the first direction and the second direction are perpendicular to each other.
In the embodiment of the present invention, by reducing the inner diameter and/or the outer diameter of the first actuating portion 101, the natural frequency of the first actuating portion 101 can be reduced, so that the natural frequency of the first actuating portion 101 is smaller than the natural frequency of the second actuating portion 102, and therefore, the first actuating portion 101 can be used as the slow axis of the scanning actuator, and the second actuator can be used as the fast axis of the scanning driver, thereby satisfying certain scanning modes with different requirements on the fast axis and the slow axis driving frequency, such as grid scanning, lissajous scanning, and the like, and reducing the natural frequency of the slow axis to be closer to the driving frequency of the slow axis, and increasing the amplitude of the slow axis.
In the embodiment of the invention, the natural frequency of the material can be expressed by
Where ω is the natural frequency of the first actuator 101/second actuator 102, E is the modulus of elasticity of the material, I is the moment of inertia in cross section, ρ is the density, a is the cross-sectional area, and L is the length of the first actuator 101/second actuator 102. According to the vibration theory, in order to lower the natural frequency of the slow axis, the length of the slow axis can be increased, but the increase of the length of the slow axis is not beneficial to the miniaturization of the scanning device. On the other hand, for the same material, the elastic modulus E and the density ρ of the material are the same, and assuming that the length L of the first and second actuation portions 101 and 102 remains the same (the length of the first and second actuation portions 101 and 102 may be the same or different), the natural frequency of the first and second actuation portions 101 and 102 depends on
By the value of the natural frequency
Increases with increasing value of (c).
In the embodiment of the present invention, the scanning actuator may be a circular tube type actuator, a square tube type actuator, or the like, which is not limited in the present invention. In the case of a circular tube type actuator,
where D is the outer diameter of the actuator and D is the inner diameter of the actuator, then
It follows that when the inner and/or outer diameter of the circular tube type actuator is reduced, it is possible to reduce the inner diameter and/or outer diameter of the circular tube type actuator
The value of (c) is also decreased, thereby decreasing the natural frequency. Therefore, for the circular tube type actuator, the inner diameter of the first actuating portion 101 may be set smaller than the inner diameter of the second actuating portion 102, or the outer diameter of the first actuating portion 101 may be set smaller than the outer diameter of the second actuating portion 102, or the inner diameter of the first actuating portion 101 may be set smaller than the inner diameter of the second actuating portion 102, and the outer diameter of the first actuating portion 101 may be set smaller than the outer diameter of the second actuating portion 102, so that the natural frequency of the first actuating portion 101 may be made smaller than the natural frequency of the second actuating portion 102.
The square tube actuator has different moments of inertia in cross section when it vibrates in different directions, and as shown in fig. 2D, the square tube actuator has a moment of inertia in cross section when it vibrates in the x direction
When the square tube type actuator vibrates along the y direction, the section inertia moment
Therefore, when calculating the sectional moment of inertia of the square tube actuator, it is necessary to calculate the corresponding sectional moment of inertia in combination with the vibration direction thereof. Practice of the inventionIn the example, when the square-tube type actuator is used as the square-tube type actuator, B is H, and the sectional moment of inertia is
From this, it can be seen that when the inner diameter and/or outer diameter of the square tube type actuator is decreased, the same becomes true
The value of (c) is also decreased, thereby decreasing the natural frequency. Therefore, for the square tube type actuator, the inner diameter of the first actuating portion 101 may be set smaller than the inner diameter of the second actuating portion 102, or the outer diameter of the first actuating portion 101 may be set smaller than the outer diameter of the second actuating portion 102, or the inner diameter of the first actuating portion 101 may be set smaller than the inner diameter of the second actuating portion 102, and the outer diameter of the first actuating portion 101 may be set smaller than the outer diameter of the second actuating portion 102, so that the natural frequency of the first actuating portion 101 may be made smaller than the natural frequency of the second actuating portion 102.
It should be noted that the natural frequency in the embodiment of the present invention refers to the first order natural frequency of the first/second actuating portions 101/102, and the expression
Is an approximate expression of the first order natural frequency, in the calculation
The air mass is ignored because the air mass is small.
In the embodiment of the present invention, there are various ways to set the inner diameter and/or the outer diameter of the first actuating portion 101, and the following ways will be described by taking the scanning actuator as a circular tube type actuator as an example, and in practical applications, the following ways are included but not limited.
In a first possible embodiment, the outer diameter of the first actuation portion is reduced by modifying the outer wall of the first actuation portion 101. As shown in FIG. 2A, D1 is the outer diameter of the first actuator 101, D1 is the inner diameter of the first actuator 101, D2 is the outer diameter of the second actuator 102, and D2 is the second actuator102, since the inner diameters of the first and second actuating portions 101 and 102 are the same, the outer diameter of the first actuating portion 101 is smaller than that of the second actuating portion 102, so that
The natural frequency of the first actuator 101 decreases, so that the natural frequency of the first actuator 101 decreases relative to the second actuator 102.
In a second possible embodiment, the inner diameter of the first actuation portion is reduced by modifying the inner wall of the first actuation portion 101. As shown in FIG. 2B, D1 is the outer diameter of first actuator 101, D1 is the inner diameter of first actuator 101, D2 is the outer diameter of second actuator 102, and D2 is the inner diameter of second actuator 102. since the outer diameters of first actuator 101 and second actuator 102 are the same, the inner diameter of first actuator 101 is smaller than the inner diameter of second actuator 102, such that
The natural frequency of the first actuator 101 decreases, so that the natural frequency of the first actuator 101 decreases relative to the second actuator 102.
In a third possible embodiment, as shown in fig. 2C, the inner and outer walls of the first actuating portion 101 may be changed simultaneously such that the inner and outer diameters of the first actuating portion 101 are both reduced, since
The natural frequency of the first actuator 101 decreases, so that the natural frequency of the first actuator 101 decreases relative to the second actuator 102.
In the embodiment of the present invention, on the basis of the corresponding embodiments of fig. 2A to 2C, in order to further reduce the natural frequency of the first actuating portion 101, as shown in fig. 3A and 3B, at least one mass block 103 may be further disposed between the first actuating portion 101 and the second actuating portion 102.
The mass block 103 is arranged between the first actuating part 101 and the second actuating part 102, which is equivalent to adding one mass block 103 to the cantilever of the first actuating part 101, thereby increasing the load of the first actuating part 101 and further reducing the natural frequency of the slow axis. In practical applications, the mass blocks 103 may be made of rubber sleeves or other materials, and the number of the mass blocks 103 may be set according to the adjustment amount of the natural frequency, which is not limited in the present invention. In the case of a scanning fiber passing through the interior of the scanning actuator, a through hole for receiving the scanning fiber may also be provided in the middle of the mass block 103.
In the embodiment of the present invention, as shown in fig. 2A and 2B, the first actuating portion 101 and the second actuating portion 102 may be directly connected. As shown in fig. 4A to 5C, the first actuator 101 and the second actuator 102 may also be connected by a partition 104, in other words, the scanning actuator further includes a partition 104 located between the first actuator 101 and the second actuator 102, and the partition 104 may separate electrodes disposed on the first actuator 101 and the second actuator 102, so as to avoid the occurrence of electrical signal interference between the first actuator 101 and the second actuator 102.
Referring to fig. 4A-4C, the inner diameters of the first and second actuating portions 101 and 102 are the same, the outer diameter of the first actuating portion 101 is smaller than the outer diameter of the second actuating portion 102, and as shown in fig. 4A, the outer diameter of the spacer portion 104 may be the same as the first actuating portion 101. As shown in fig. 4B, the outer diameter of the isolation portion 104 may be the same as the second actuation portion 102. As shown in fig. 4C, the outer diameter of the spacer 104 may be tapered, gradually increasing in the direction from the rear to the front. In practical applications, the arrangement of the isolation portion 104 may be selected according to actual needs, which is not limited by the present invention.
Referring to fig. 5A to 5C, the outer diameters of the first and second actuating portions 101 and 102 are the same, and the inner diameter of the first actuating portion 101 is smaller than the outer diameter of the second actuating portion 102, and as shown in fig. 5A, the inner diameter of the spacer portion 104 is the same as the inner diameter of the first actuating portion 101. As shown in fig. 5B, the inner diameter of the isolation portion 104 is the same as the inner diameter of the second actuation portion 102. As shown in fig. 5C, the inside diameter of the partition 104 may be tapered, gradually increasing in the direction from the rear to the front. In practical applications, the arrangement of the isolation portion 104 may be selected according to actual needs, which is not limited by the present invention.
In the embodiment of the present invention, the first actuating portion 101 and the second actuating portion 102 may be integrally formed or fixedly connected. When the scanning actuator includes the partition 104, the first actuator 101, the second actuator 102 and the partition 104 may be integrally formed or fixedly connected, which is not limited in the present invention.
Based on the same inventive concept, the embodiment of the invention also provides a display module, which comprises a light source, an optical fiber and a scanning actuator; the optical fiber is fixed on the second actuating part, one end of the optical fiber is connected with the light source, the other end of the optical fiber exceeds the second actuating part and forms an optical fiber cantilever, and the optical fiber cantilever is driven by the scanning actuator to sweep in a three-dimensional space in a synthetic direction of a first direction and a second direction; the modulated light output by the light source is coupled into the optical fiber and is emitted out through the light-emitting end of the optical fiber cantilever to be used as projection display image light. In the embodiment of the present invention, the Light source may be an RGB three-color Light source, the type of the Light source may be a laser or an LED (Light Emitting Diode), and the like, which is not limited in the present invention.
The display module in the embodiment of the invention can be applied to various projection display devices, such as: head-mounted AR (English full name: Augmented Reality) equipment, head-mounted VR English full name: VirtualReality; chinese name: virtual reality) equipment, projection televisions, projectors, etc., in these projection display equipment, can use a display module to show, can also show through the mode that a plurality of display modules splice, and this the invention does not do the restriction.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
in the scheme of the embodiment of the invention, the inner diameter and/or the outer diameter of the first actuating part are/is changed to enable the inner diameter of the first actuating part to be smaller than the inner diameter of the second actuating part and/or the outer diameter of the first actuating part to be smaller than the outer diameter of the second actuating part, so that the natural frequency of the first actuating part is reduced to enable the natural frequency of the first actuating part to be smaller than the natural frequency of the second actuating part, the requirement of the slow axis driving frequency is met, and the slow axis amplitude is increased.
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (9)
1. A scanning actuator, comprising a first actuating portion and a second actuating portion connected in sequence in a backward-forward direction; the first actuating portion can drive the second actuating portion to vibrate in a first direction, and the second actuating portion can vibrate in a second direction;
the scanning actuator is a tubular actuator; the inner diameter of the first actuation portion is smaller than the inner diameter of the second actuation portion and/or the outer diameter of the first actuation portion is smaller than the outer diameter of the second actuation portion such that the natural frequency of the first actuation portion is smaller than the natural frequency of the second actuation portion.
2. The scan actuator of claim 1, wherein at least one mass is disposed between the first and second actuating portions.
3. The scanning actuator of claim 1, further comprising a spacer between the first and second actuation portions.
4. The scan actuator of claim 1, wherein the first actuation portion and the second actuation portion are integrally formed or fixedly connected.
5. The scan actuator of any one of claims 1 to 4, wherein the tubular actuator is a circular tube type actuator or a square tube type actuator.
6. A display module comprising a light source, an optical fiber and a scanning actuator according to any one of claims 1-5; the optical fiber is fixed on the second actuating part, one end of the optical fiber is connected with the light source, the other end of the optical fiber exceeds the second actuating part and forms an optical fiber cantilever, and the optical fiber cantilever is driven by the scanning actuator to sweep in a three-dimensional space in a synthetic direction of a first direction and a second direction; the modulated light output by the light source is coupled into the optical fiber and is emitted out through the light-emitting end of the optical fiber cantilever to be used as projection display image light.
7. A projection display device comprising one or more sets of display modules according to claim 6.
8. The projection display device of claim 7, wherein the projection display device is a head mounted augmented reality display device or a head mounted virtual reality display device.
9. The projection display device of claim 7, wherein the projection display device is a projector or a projection television.
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| CN201910320062.3A CN111830703A (en) | 2019-04-19 | 2019-04-19 | Scanning actuator, display module and projection display equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910320062.3A CN111830703A (en) | 2019-04-19 | 2019-04-19 | Scanning actuator, display module and projection display equipment |
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-
2019
- 2019-04-19 CN CN201910320062.3A patent/CN111830703A/en active Pending
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| CN104620156A (en) * | 2012-10-01 | 2015-05-13 | 奥林巴斯株式会社 | Optical fiber scanner |
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