CN111751923B - Optical fiber and scanning light imaging display device - Google Patents
Optical fiber and scanning light imaging display device Download PDFInfo
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- CN111751923B CN111751923B CN201910252263.4A CN201910252263A CN111751923B CN 111751923 B CN111751923 B CN 111751923B CN 201910252263 A CN201910252263 A CN 201910252263A CN 111751923 B CN111751923 B CN 111751923B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
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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
Abstract
The invention discloses an optical fiber, wherein one end of an emergent light beam of the optical fiber is taken as a front end, the front end face of the optical fiber is provided with an emergent angle adjusting structure, the emergent angle adjusting structure enables an included angle alpha to be formed between the axis of a light cone emergent from the front end of the optical fiber and the axis of the part of the optical fiber positioned at the foremost end, and alpha is more than 0 degree and less than 90 degrees. A scanning light imaging display device using the optical fiber is also disclosed. The beneficial effects of the invention are: when a plurality of optical fibers are spliced and projected for display, the deflection angle of the light cone allows the distance between the adjacent optical fibers to be reduced, so that the space utilization rate of the equipment is improved; more optical fibers are arranged on the same actuator, and an emergent image with a larger area can be obtained under the driving of a single actuator.
Description
Technical Field
The invention relates to the technical field of optical fiber scanning imaging, in particular to an optical fiber and a scanning light imaging display device.
Background
The structure of the scanning light imaging display device used for projection at present is shown in fig. 1. The part of the optical fiber beyond the actuator forms an optical fiber cantilever, the optical fiber cantilever is driven by the actuator to perform plane scanning, and a scanning track of the optical fiber cantilever forms a curved surface (spiral scanning corresponds to a spherical surface, and grid scanning corresponds to a cylindrical surface) right opposite to the actuator in the scanning process. Correspondingly, the projection picture is projected on the right opposite side of the actuator.
When large-size screen projection is performed, multiple scanners are often required to perform screen splicing, as shown in fig. 1 and fig. 2, a first projection screen 201 is projected by a first scanner 101, a second projection screen 202 is projected by a second scanner 101, and a third projection screen 203 is projected by a third scanner 103.
The problems are that: limited by the parallel arrangement of the fiber optic cantilevers and actuators, a picture can only be projected on the directly opposite side of the actuators, and cannot be imaged on both sides of the directly opposite side (i.e., left-opposite and right-opposite). In certain product applications (such as projection keyboards, products requiring oblique projection), it may be necessary to tilt the entire scanning light imaging display device or to add reflective elements to direct the light beam to the desired projection surface, but both of these approaches result in a certain amount of wasted space. For another example, in image stitching, a certain gap needs to be maintained between the scanners, and there are generally two arrangement methods, namely parallel arrangement (as shown in fig. 1) and divergent arrangement (as shown in fig. 2), but both of these two arrangement methods waste space.
The invention is used for enabling the scanning light imaging display device to have more projection angles so as to improve the utilization rate of the scanning light imaging display device to the space.
Disclosure of Invention
The embodiment of the invention provides an optical fiber, which is used for effectively reducing the distance between adjacent optical fibers when a plurality of optical fibers are spliced and projected for display so as to improve the space utilization rate of equipment.
In order to achieve the above object, a first aspect of the embodiments of the present invention provides an optical fiber, in which an end of a light beam emitted from the optical fiber is a front end, and a front end face of the optical fiber has an emission angle adjusting structure, where the emission angle adjusting structure makes an included angle α between an axis of a light cone emitted from the front end of the optical fiber and an axis of a portion of the optical fiber located at the frontmost end, where α is greater than 0 ° and less than 90 °.
When a plurality of optical fibers are spliced for projection display, the deflection angle of the light cone allows the distance between the adjacent optical fibers to be reduced, so that the space utilization rate of the equipment is improved.
Optionally, the exit angle adjusting structure is a front end face of the optical fiber, the front end face is an inclined face having an included angle β with an axis of a portion of the optical fiber located at the foremost end, β is greater than 0 ° and less than 90 °, and satisfies:
n is the refractive index of the fiber.
The emergent angle adjusting structure is a grating arranged on the front end face of the optical fiber and meets the following requirements: dsin alpha = m lambda, wherein d is the grating period, lambda is the wavelength of emergent light, m can be 0, ± 1, ± 2, ± 3 \8230, 8230, the correspondingly obtained spectra are called zeroth order spectrum, first order spectrum, second order spectrum, third order spectrum \8230, 8230, and signs, +, -respectively represent that the incident angle and the diffraction angle are on the same side or on the opposite side of the normal.
A second aspect of the embodiments of the present invention provides a scanning light imaging display device, including an optical fiber and an actuator, where a front end of the optical fiber emits a light beam, the optical fiber is fixed to the actuator in a cantilever-supported manner, a part of the front end of the optical fiber, which exceeds a front end of the actuator, is an optical fiber cantilever, the actuator drives the optical fiber cantilever to vibrate along at least two axes which are both perpendicular to a first direction, the first direction is not perpendicular to an axis of the optical fiber cantilever, a front end surface of the optical fiber has an exit angle adjusting structure, and the exit angle adjusting structure enables an included angle α to be formed between an axis of a light cone emitted from the front end of the optical fiber and the axis of the optical fiber cantilever, where α is greater than 0 ° and less than 90 °.
Preferably, the first direction is parallel to the axis of the fiber optic cantilever.
Similarly, the exit angle adjusting structure can be a front end face of the optical fiber cantilever, the front end face is an inclined plane having an included angle beta with the axis of the optical fiber cantilever, beta is larger than 0 degree and smaller than 90 degrees, and the requirements are met:
n is the refractive index of the fiber. When the material of the optical fiber is silicon dioxide, the refractive index n of the optical fiber is 1.45.
The emergent angle adjusting structure can also be a grating arranged on the front end face of the optical fiber and meets the following requirements: dsin alpha = m lambda, wherein d is the grating period, lambda is the wavelength of emergent light, m can be 0, ± 1, ± 2, ± 3 \8230, 8230, the correspondingly obtained spectra are called zeroth order spectrum, first order spectrum, second order spectrum, third order spectrum \8230, 8230, and signs, +, -respectively represent that the incident angle and the diffraction angle are on the same side or on the opposite side of the normal.
Specifically, the two ends of the actuator are respectively a free end and a fixed end, the free end vibrates along at least two axes relative to the fixed end, and each axis is perpendicular to the first direction.
In a preferred embodiment, at least two optical fibers with mutually parallel optical fiber cantilevers are arranged on the actuator, the optical fiber cantilevers form an optical fiber cantilever array, the front end face of at least one optical fiber cantilever in the optical fiber cantilevers is provided with an exit angle adjusting structure, the exit angle adjusting structure enables an included angle α to be formed between the axis of a light cone emitted from the front end of the optical fiber and the axis of the optical fiber cantilever, the included angle α is greater than 0 ° and less than 90 °, and the light cone deflects to one side deviating from the center of the optical fiber array. Similarly, the deflection angle allows the spacing between the two fiber cantilevers to be reduced, so that more fibers can be arranged on the same actuator, and an emergent image with a larger area can be obtained under the driving of a single actuator.
The actuator is a piezoelectric actuator, a magnetostrictive actuator, a Micro Electro Mechanical System (MEMS) or an electromagnetic actuator, etc. Preferably, the actuator is a piezoelectric actuator.
Optionally, the piezoelectric actuator comprises one or more of a bimorph actuator, a piezoelectric material tube actuator and a piezoelectric sheet drive actuator.
Optionally, the piezoelectric actuator includes a first actuating portion and a second actuating portion, two ends of the first actuating portion and two ends of the second actuating portion are respectively a fixed end and a free end, and the fixed end of the second actuating portion is fixedly connected with the free end of the first actuating portion; the free end of the first actuating portion vibrates in at least one direction perpendicular to the first direction relative to the fixed end thereof, and the free end of the second actuating portion vibrates in at least one direction perpendicular to the first direction relative to the fixed end thereof. The motion track of the free end of the second actuating part relative to the fixed end of the first actuating part is the composition of the vibration tracks of the first actuating part and the second actuating part. As a preferred embodiment of such an embodiment, the free end of the first actuating portion vibrates in one direction perpendicular to the first direction with respect to the fixed end thereof, the free end of the second actuating portion vibrates in one direction perpendicular to the first direction with respect to the fixed end thereof, and the two vibration directions are perpendicular to each other, so that the fiber cantilever can make lissajous-type scanning or grid-type scanning under the drive of the piezoelectric actuator. The natural frequency of the second actuating part is far greater than that of the first actuating part so as to meet the requirements of grid type scanning.
The first and second actuating portions may each be a bimorph actuator, a piezoelectric material tube actuator, or a piezoelectric patch drive actuator.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
when a plurality of optical fibers are spliced and projected for display, the deflection angle of the light cone allows the distance between the adjacent optical fibers to be reduced, so that the space utilization rate of the equipment is improved. More optical fibers are arranged on the same actuator, and an emergent image with a larger area can be obtained under the driving of a single actuator.
Drawings
FIG. 1 is a schematic view of an installation structure of a multi-scanner tiled display;
FIG. 2 is a schematic view of another installation structure of a tiled display with multiple scanners;
FIG. 3 is a schematic structural diagram of an optical fiber and a scanning light imaging display device according to the present invention;
fig. 4 is a schematic structural diagram of an embodiment of an exit angle adjusting structure of the present invention;
fig. 5 is a schematic structural view of another embodiment of the exit angle adjusting structure of the present invention;
FIG. 6 is a schematic diagram showing the comparison of the effect of the optical fiber of the present invention and the effect of the conventional optical fiber when used for the tiled display;
FIG. 7 is a schematic diagram showing another comparison between the effect of the optical fiber of the present invention and the effect of the conventional optical fiber when used for a tiled display;
FIG. 8 is a schematic diagram of another embodiment of a scanning light imaging display device according to the invention;
FIG. 9 is a cross-sectional view of the piezoelectric material tube actuator of the present invention taken in a cross-section perpendicular to the axial direction;
fig. 10 is a cross-sectional view of the piezoelectric sheet drive actuator of the present invention taken in a cross-section perpendicular to a first direction;
FIG. 11 is a schematic view of another structure of a scanning light imaging display device according to the present invention;
figure 12 is a cross-sectional view of a bimorph actuator of the present invention taken in a cross-section perpendicular to the first direction.
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.
The embodiment of the invention provides an optical fiber which is used for effectively reducing the distance between adjacent optical fibers when a plurality of optical fibers are spliced and projected for display so as to improve the space utilization rate of equipment.
In a first aspect of the embodiments of the present invention, as shown in fig. 3, an end of a light beam emitted from an optical fiber 2 is taken as a front end, a front end face of the optical fiber 2 is provided with an emission angle adjusting structure 3, and the emission angle adjusting structure 3 makes an included angle α between an axis 11 of a light cone emitted from the front end of the optical fiber and an axis 12 of a portion of the optical fiber located at the frontmost end, where α is greater than 0 ° and less than 90 °.
Specifically, the optical fiber 2 includes an optical fiber cantilever 21, a fixing portion 22 and a main body portion 23 that are integrally formed and sequentially connected in a front-to-rear direction, the fixing portion 22 is used for being fixedly connected with an actuator 4 of the scanning light imaging display device to fix the optical fiber cantilever 21 in a cantilever supporting manner, a front end face of the optical fiber cantilever 21 is a front end face of the optical fiber, the front end face is provided with the exit angle adjusting structure 3, the exit angle adjusting structure 3 enables an included angle α to be formed between an axis of a light cone emitted by the optical fiber cantilever and an axis of the optical fiber cantilever, and α is greater than 0 ° and less than 90 °.
Optionally, the exit angle adjusting structure 3 is a front end face 31 of the optical fiber cantilever, as shown in fig. 4, the front end face 31 is an inclined plane having an included angle β with the axis 12 of the optical fiber cantilever, where β is greater than 0 ° < β < 90 °, and satisfies:
n is the refractive index of the optical fiber 2. When the optical fiber is made of silicon dioxide, the refractive index n of the optical fiber is 1.45.
Optionally, as shown in fig. 5, the exit angle adjusting structure 3 is a grating 32 disposed on the front end face of the optical fiber, and satisfies: dsin α = m λ, where d is the grating period, λ is the wavelength of the outgoing light, m may be 0, ± 1, ± 2, ± 3 \8230, 8230, and the correspondingly obtained spectra are called zero-order spectrum, first-order spectrum, second-order spectrum, third-order spectrum \8230, 8230, and + and-signs respectively indicate the incident angle and the diffraction angle on the same side or on the opposite side of the normal. Generally, the first order diffracted light is selected. Further, the optical fiber 2 includes a core and a cladding layer covering the core, and the grating 32 is disposed on the front end surface of the core.
The advantage of the present invention of improving space utilization is illustrated by the following examples.
For example, as shown in fig. 6, in order to obtain a spliced picture, the picture is spliced by a first projection surface projected by an actuator-driven conventional structured optical fiber 51 and a second projection surface projected by an actuator-driven conventional structured optical fiber 52, and the first projection surface and the second projection surface have an overlapping portion with a width m. When the optical fiber, such as the optical fiber 52, is replaced by the optical fiber 53 proposed in the present invention, the extending direction of the optical fiber cantilever is kept unchanged, but the outgoing beam of the optical fiber 53 has an angle with the axial direction of the optical fiber cantilever, and when the outgoing beam of the optical fiber 53 is deflected away from the optical fiber 51, the angle allows the distance between the two optical fibers to be reduced, thereby reducing the space occupied by the whole scanning device and facilitating the reduction of the packaging volume of the device.
Similarly, as shown in fig. 7, the screen is formed by splicing a first projection surface projected by the conventional configuration optical fiber 51 driven by the actuator and a second projection surface projected by the conventional configuration optical fiber 52 driven by the actuator, and the first projection surface and the second projection surface have an overlapping portion with a width m. When the two scanners are replaced by the optical fibers 53 and 54 provided by the invention, the extension directions of the optical fiber cantilevers are kept unchanged, but the outgoing light beams of the optical fibers 53 and 54 have an angle with the axial direction of the optical fiber cantilevers, and the outgoing light beams of the optical fibers 53 and 54 are deflected in the direction away from each other, so that the deflection angle allows the distance between the two optical fibers to be reduced, thereby reducing the space occupied by the whole scanning device and being beneficial to reducing the packaging volume of equipment.
A second aspect of the embodiment of the present invention provides a scanning light imaging display device, as shown in fig. 3, including an optical fiber 2 and an actuator 4, where the front end of the optical fiber 2 emits a light beam, the optical fiber is fixed to the actuator in a cantilever-supported manner, a part of the front end of the optical fiber 2, which exceeds the front end of the actuator 4, is an optical fiber cantilever 41, the actuator 4 drives the optical fiber cantilever 41 to vibrate along at least two axes perpendicular to a first direction, the first direction is not perpendicular to an axis 12 of the optical fiber cantilever 41, the front end face of the optical fiber 2 is provided with an exit angle adjusting structure 3, and the exit angle adjusting structure 3 makes an included angle α between an axis 11 of a light cone emitted from the front end of the optical fiber 2 and the axis 12 of the optical fiber cantilever, where α is greater than 0 ° and less than 90 °.
Preferably, the first direction is parallel to the axis 12 of the fiber suspension 41.
Also as previously described, the exit angle is as shown in FIG. 4The adjusting structure 3 can be a front end face 31 of the optical fiber cantilever, the front end face 31 is an inclined plane having an included angle β with the axis 12 of the optical fiber cantilever 41, β is greater than 0 degree and less than 90 degrees, and satisfies:
n is the refractive index of the fiber. When the material of the optical fiber is silicon dioxide, the refractive index n of the optical fiber is 1.45.
As shown in fig. 5, the exit angle adjusting structure 3 may also be a grating 32 disposed on the front end face of the optical fiber, and satisfies: dsin alpha = m lambda, wherein d is the grating period, lambda is the wavelength of emergent light, m can be 0, ± 1, ± 2, ± 3 \8230, 8230, the correspondingly obtained spectra are called zeroth order spectrum, first order spectrum, second order spectrum, third order spectrum \8230, 8230, and signs, +, -respectively represent that the incident angle and the diffraction angle are on the same side or on the opposite side of the normal. Generally, the first order diffracted light is selected. Further, the optical fiber 2 includes a core and a cladding layer covering the core, and the grating 32 is disposed on the front end surface of the core.
Specifically, the two ends of the actuator 4 are a free end and a fixed end respectively, the free end vibrates along at least two axes relative to the fixed end, and each axis is perpendicular to the first direction.
Optionally, a mounting hole for mounting the optical fiber 2 is provided in the body of the actuator 4, and a portion of the optical fiber 2 located at the rear side of the optical fiber cantilever 21, that is, the fixing portion 22, is fixedly mounted in the mounting hole.
Alternatively, the portion of the optical fiber 2 located at the rear side of the fiber suspension 21, i.e. the fixing portion 22, is fixedly mounted on the surface of the actuator 4.
As a preferred embodiment, as shown in fig. 8, at least two optical fibers 2 with mutually parallel optical fiber cantilevers are arranged on the actuator, the optical fiber cantilevers 41 form an optical fiber cantilever array, the front end face of at least one optical fiber cantilever 41 in the optical fiber cantilevers 41 is provided with an exit angle adjusting structure 3, the exit angle adjusting structure 3 enables an included angle α to be formed between an axis 11 of a light cone emitted from the front end of the optical fiber and an axis 12 of the optical fiber cantilever, the included angle α is more than 0 ° < α < 90 °, and the light cone is deflected to a side deviating from the center of the optical fiber array. Similarly, the deflection angle allows the spacing between the two fiber cantilevers to be reduced, so that more fibers can be arranged on the same actuator, and an emergent image with a larger area can be obtained under the driving of a single actuator.
The actuator 4 includes a piezoelectric actuator, a magnetostrictive actuator, a Micro Electro Mechanical System (MEMS), an electromagnetic actuator, or the like. Preferably, the actuator 4 is a piezoelectric actuator.
Further, the piezoelectric actuator comprises one or more of a bimorph actuator, a piezoelectric material tube actuator and a piezoelectric sheet driving actuator.
As an alternative embodiment, as shown in fig. 9, the piezoelectric actuator is a piezoelectric material tube actuator, the piezoelectric material tube actuator includes a piezoelectric material tube 411, an outer surface of the piezoelectric material tube 411 is provided with at least two pairs of outer electrodes 412 that are symmetrical with respect to an axial center of the piezoelectric material tube 411, an inner surface of the piezoelectric material tube 411 is provided with inner electrodes 413 that are matched with the outer electrodes 412, and a portion of the piezoelectric material tube 411 located between the outer electrodes 412 and the corresponding inner electrodes 413 is polarized in a radial direction. So that when the inner electrode 413 and the outer electrode 412 are connected to an external driving device, the free end of the piezoelectric actuator vibrates along its corresponding axis, and the axial direction of the piezoelectric material tube 411 is the first direction.
Each of the outer and inner electrodes 412 and 413 of the piezoelectric material tube 411 is connected to an external driving circuit to apply an alternating electric field to the piezoelectric material tube 411 through each pair of the mating outer and inner electrodes 412 and 413. The piezoelectric material tubes 411 are polarized along the radial direction, and each pair of outer electrodes 412 and inner electrodes 413 corresponding to the outer electrodes 412 and inner electrodes 413 which are symmetrical about the axial line of the piezoelectric material tubes 411 are driven to expand and contract in opposite directions at the same moment, that is, when one outer electrode 412 and one inner electrode 413 in each pair of outer electrodes 412 drive the piezoelectric material tube 411 in the range to expand, the other outer electrode 412 and the inner electrode 413 thereof drive the piezoelectric material tube 411 in the range to synchronously shorten; and vice versa. When one end of the piezoelectric material tube 411 is fixed, the other end of the piezoelectric material tube 411 is a free end, and the synchronous extension and contraction makes the free end of the piezoelectric material tube 411 vibrate in a direction perpendicular to the axis relative to the fixed end. When the outer surface of the piezoelectric material tube 411 is provided with n pairs of outer electrodes 412 that are symmetrical about the axis of the piezoelectric material tube 411, the free end of the piezoelectric material tube 411 may vibrate in n directions perpendicular to the axis with respect to the fixed end. As a preferred embodiment of such an embodiment, n is 2, and the two vibration directions are perpendicular to each other, so that the fiber cantilever can perform spiral scanning under the driving of the piezoelectric actuator.
As an alternative embodiment, as shown in fig. 10, the piezoelectric sheet driving actuator includes a base 421, at least two first piezoelectric sheets 422 extending and contracting in a first direction are attached to a surface of the base 421 at intervals along a circumferential direction, at least two first piezoelectric sheets 422 in the first piezoelectric sheets 422 are not symmetric with respect to a center of the base 421, and when the two first piezoelectric sheets 422 are symmetric with respect to the center of the base 421, extending and contracting directions of the two first piezoelectric sheets 422 symmetric with respect to the center of the base 421 at any time are opposite, two ends of the base 421 along the first direction are respectively a fixed end and a free end, and the extending and contracting of the first piezoelectric sheets 422 drive the free end of the base 421 to vibrate in a direction perpendicular to the first direction with respect to the fixed end. When the surface of the base 421 is provided with n first piezoelectric sheets 422 that are not symmetrical with respect to the center of the base 421, the free end of the base 421 may vibrate in n directions perpendicular to the axis line with respect to the fixed end. As a preferred embodiment of such an embodiment, n is 2, and the two vibration directions are perpendicular to each other, so that the fiber optic cantilever can perform spiral scanning under the driving of the piezoelectric actuator.
The first piezoelectric sheet 422 includes a sheet of piezoelectric material, and a surface of the sheet of piezoelectric material contacting the base 421 and a surface opposite to the surface are both provided with electrodes, and the sheet of piezoelectric material is polarized in a direction perpendicular to the two surfaces, that is, the sheet of piezoelectric material is polarized in a thickness direction.
The cross section of the substrate 421 can be any closed figure formed by straight lines and/or curved lines; for example, the cross section of the substrate 421 may be square, circular, or oval.
As an alternative embodiment, as shown in fig. 10, the piezoelectric actuator includes a first actuating portion 41 and a second actuating portion 42, both ends of the first actuating portion 41 and the second actuating portion 42 are respectively a fixed end and a free end, and the fixed end of the second actuating portion 42 is fixedly connected with the free end of the first actuating portion 41; the free end of the first actuating portion 41 vibrates in at least one direction perpendicular to the first direction with respect to the fixed end thereof, and the free end of the second actuating portion 42 vibrates in at least one direction perpendicular to the first direction with respect to the fixed end thereof. The motion trajectory of the free end of the second actuator 42 with respect to the fixed end of the first actuator 41 is the composite of the vibration trajectories of the first actuator 41 and the second actuator 42. As a preferred embodiment of such an embodiment, the free end of the first actuating part 41 vibrates in one direction perpendicular to the first direction with respect to the fixed end thereof, the free end of the second actuating part 42 vibrates in one direction perpendicular to the first direction with respect to the fixed end thereof, and the two vibration directions are perpendicular to each other, so that the fiber cantilever can make lissajous-type scanning or grid-type scanning under the drive of the piezoelectric actuator. The natural frequency of the second actuator 42 is much greater than that of the first actuator 411 to satisfy the requirement of the grid scanning.
The first and second actuating portions 41 and 42 may be bimorph actuators, piezoelectric material tube actuators, or piezoelectric sheet-driven actuators.
As shown in fig. 11, the bimorph actuator includes a middle spacer 431 extending in a first direction, one side of the middle spacer 431 is provided with a first piezoelectric material piece 432 parallel to the middle spacer 431, the other side of the middle spacer 431 is provided with a second piezoelectric material piece 433 parallel to the middle spacer 431, each of the first piezoelectric material piece 432 and the second piezoelectric material piece 433 has two first surfaces parallel to the middle spacer 431, and the first surfaces of the first piezoelectric material piece 432 and the second piezoelectric material piece 433 are both provided with a layer of electrodes 434.
The electrodes 434 of the first piezoelectric material piece 432 and the second piezoelectric material piece 433 are each connected to an external drive circuit to apply an alternating electric field to the piezoelectric material pieces through the electrodes 434. The first piezoelectric material piece 432 expands or contracts by the alternating electric field applied from the electrode 434, and the second piezoelectric material piece 433 expands or contracts by the alternating electric field applied from the electrode 434, and the directions of expansion and contraction of the first piezoelectric material piece 432 and the second piezoelectric material piece 433 are opposite at any one time.
Since one end of the first and second actuating portions 41 and 42 is a fixed end, the synchronous reverse expansion and contraction of the first and second piezoelectric material pieces 432 and 433 will drive the free end of the actuating portion to vibrate in a direction perpendicular to the middle spacer 431 relative to the fixed end thereof.
As shown in fig. 8, the piezoelectric tube actuator includes a piezoelectric tube 411, wherein at least two pairs of outer electrodes 412 are disposed on an outer surface of the piezoelectric tube 411, and are symmetrical with respect to an axial center of the piezoelectric tube 411, and an inner electrode 413 is disposed on an inner surface of the piezoelectric tube 411 and is matched with the outer electrodes 412. So that the front end of the actuator vibrates along its corresponding axis when the inner electrode 413 and the outer electrode 412 are connected to an external driving device.
Each of the outer electrodes 412 and the inner electrodes 413 of the piezoelectric material tube 411 is connected to an external driving circuit to apply an alternating electric field to the piezoelectric material tube 411 through each pair of the mating outer electrode 412 and inner electrode 413. The piezoelectric material tubes 411 are polarized along the radial direction, each pair of outer electrodes 412 and corresponding inner electrodes 413 which are symmetrical about the axial line of the piezoelectric material tubes 411 drive the piezoelectric material tubes 411 to expand and contract in opposite directions at the same time, namely when one outer electrode 412 and one inner electrode 413 in each pair of outer electrodes 412 drive the piezoelectric material tubes 411 located in the range to expand, the other outer electrode 412 and the other inner electrode 413 drive the piezoelectric material tubes 411 located in the range to synchronously contract; and vice versa. When one end of the piezoelectric material tube 411 is fixed, the other end of the piezoelectric material tube 411 is a free end, and the synchronous extension and contraction causes the free end of the piezoelectric material tube 411 to vibrate in a direction perpendicular to the axis relative to the fixed end. When the outer surface of the piezoelectric material tube 411 is provided with n pairs of outer electrodes 412 that are symmetrical about the axis of the piezoelectric material tube 411, the free end of the piezoelectric material tube 411 may vibrate in n directions perpendicular to the axis with respect to the fixed end. As a preferred embodiment of such an embodiment, n is 1 or 2, and when n is 2, one pair of the external electrodes 412 and the corresponding internal electrodes 413 which are symmetric about the axis of the piezoelectric material tube 411 drives the free end of the piezoelectric material tube 411 to vibrate in a direction perpendicular to the axis with respect to the fixed end thereof, and the other pair of the external electrodes 412 and the corresponding internal electrodes 413 which are symmetric about the axis of the piezoelectric material tube 411 drives the free end of the piezoelectric material tube 411 to vibrate in another direction perpendicular to the axis, so that the piezoelectric material tube actuator has a correction function, and the final vibration direction thereof can be freely adjusted to overcome the distortion of the scanning track caused by the errors in the mounting, processing and other steps.
As shown in fig. 9, the piezoelectric sheet driving actuator includes a base 421 having an axial direction as a first direction, at least one first piezoelectric sheet 422 extending and contracting along the first direction is attached to a surface of the base 421 at intervals along a circumferential direction, when at least two first piezoelectric sheets 422 are attached to the surface of the base 421 at intervals along the circumferential direction, any two first piezoelectric sheets 422 may or may not be symmetric with respect to a center of the base 421, two ends of the base 421 along the first direction are a fixed end and a free end, respectively, and the extension and contraction of the first piezoelectric sheets 422 drive the free end of the base 421 to vibrate in a direction perpendicular to the first direction with respect to the fixed end. When the two first piezoelectric sheets 422 are symmetric about the center of the base 421, the expansion and contraction directions of the two first piezoelectric sheets 422 symmetric about the center of the base 421 at any time are opposite, so that the two first piezoelectric sheets 422 drive the base 421 to vibrate in a direction perpendicular to the first direction; the first piezoelectric patches 422, which are not symmetric about the center of the base 421, each drive the base 421 to vibrate in a corresponding direction perpendicular to the first direction. The surface of the base 421 may be provided with only one first piezoelectric sheet 422 or only two first piezoelectric sheets 422 with respect to the center of the base 421, so that the free end of the base 421 may vibrate in a direction perpendicular to the first direction; at least two first piezoelectric sheets 422 which are not symmetrical with respect to the center of the base 421 may be provided, so that the free end of the base 421 may vibrate in a plurality of directions perpendicular to the first direction, and the piezoelectric sheet driving actuator may have a correction function, and the final vibration direction thereof may be freely adjusted to overcome distortion of a scanning track due to errors in mounting, machining, and the like.
The first piezoelectric sheet 422 includes a sheet of piezoelectric material, and a surface of the sheet of piezoelectric material contacting the base 421 and a surface opposite to the surface are both provided with electrodes, and the sheet of piezoelectric material is polarized in a direction perpendicular to the two surfaces, that is, the sheet of piezoelectric material is polarized in a thickness direction.
The cross section of the substrate 421 can be any closed figure formed by straight lines and/or curved lines; for example, the cross section of the substrate 421 may be square, circular, or oval.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" or "comprises" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The use of the words first, second, third, etc. do not denote any order, but rather the words are to be construed as names.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
when a plurality of optical fibers are spliced and projected for display, the deflection angle of the light cone allows the distance between the adjacent optical fibers to be reduced, so that the space utilization rate of the equipment is improved. More optical fibers are arranged on the same actuator, and an emergent image with a larger area can be obtained under the driving of a single actuator.
All features disclosed in this specification, except features that are mutually exclusive, may be combined in any way.
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 (6)
1. A scanning light imaging display device is characterized by comprising an optical fiber and an actuator, wherein a light beam is emitted from the front end of the optical fiber, the optical fiber is fixed on the actuator in a cantilever supporting mode, the part of the front end of the optical fiber, which exceeds the front end of the actuator, is an optical fiber cantilever, the actuator drives the optical fiber cantilever to vibrate along at least two axes which are perpendicular to a first direction, the first direction is not perpendicular to the axis of the optical fiber cantilever, the actuator is provided with at least two optical fibers with the optical fiber cantilevers parallel to each other, the optical fiber cantilevers form an optical fiber cantilever array, the front end face of at least one optical fiber cantilever in the optical fiber cantilevers is provided with an exit angle adjusting structure, the exit angle adjusting structure enables the axis of a light cone emitted from the front end of the optical fiber and the axis of the optical fiber cantilever to form an included angle alpha, and the angle alpha is more than 0 degrees and less than 90 degrees.
2. A scanning light imaging display device according to claim 1, wherein said exit angle adjusting structure is a front end face of the optical fiber cantilever, said front end face is a slope having an angle β with the axis of the optical fiber cantilever, 0 ° < β < 90 °, and satisfies:
n is the refractive index of the optical fiber.
3. A scanning-light imaging display device as claimed in claim 1, wherein said exit angle adjusting structure is further a grating disposed on the front end face of the optical fiber and satisfies: dsin alpha = m lambda, where d is the grating period, lambda is the wavelength of the emergent light, and m may be 0, ± 1, ± 2, ± 3 \8230;.
4. A scanning light imaging display device according to claim 1, wherein the actuator has two ends, a free end and a fixed end, respectively, the free end being oscillated about at least two axes with respect to the fixed end, each axis being perpendicular to said first direction.
5. A scanning light imaging display device according to claim 1, wherein said actuator comprises a first actuator portion and a second actuator portion, each of said first actuator portion and said second actuator portion having a fixed end and a free end, respectively, said fixed end of said second actuator portion being fixedly connected to said free end of said first actuator portion; the free end of the first actuating portion vibrates in at least one direction perpendicular to the first direction relative to the fixed end thereof, and the free end of the second actuating portion vibrates in at least one direction perpendicular to the first direction relative to the fixed end thereof.
6. A scanning light imaging display device according to claim 4 or 5, wherein said actuators are piezoelectric actuators, said piezoelectric actuators comprising one or more of bimorph actuators, piezoelectric material tube actuators and piezoelectric patch drive actuators.
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