CN112147775A - Optical fiber scanning device and scanning display equipment - Google Patents
Optical fiber scanning device and scanning display equipment Download PDFInfo
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- CN112147775A CN112147775A CN201910578034.1A CN201910578034A CN112147775A CN 112147775 A CN112147775 A CN 112147775A CN 201910578034 A CN201910578034 A CN 201910578034A CN 112147775 A CN112147775 A CN 112147775A
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- 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
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- G02B26/103—Scanning systems having movable or deformable optical fibres, light guides or waveguides as scanning elements
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Abstract
The invention aims to provide an optical fiber scanning device and scanning display equipment, which are used for improving the detection effect of the display equipment on the light emergent condition of an optical fiber scanner in the scanning projection process. An optical fiber scanning device comprising: the optical fiber scanner comprises a scanning optical fiber, a feedback optical fiber and an actuator, wherein the scanning optical fiber is fixedly arranged on the actuator along a first direction, a part of a light outlet end of the scanning optical fiber, which exceeds the actuator, forms an optical fiber cantilever, and the light outlet end of the feedback optical fiber is fixedly arranged on the actuator; the detection light source is connected with the input end of the feedback optical fiber and used for emitting detection light, and the detection light is emitted from the light emitting end of the feedback optical fiber after being transmitted by the feedback optical fiber; and the optical detector is arranged on the light emitting path of the feedback optical fiber and used for receiving the emergent light of the feedback optical fiber and processing the received optical signal into an electric signal.
Description
Technical Field
The invention relates to the technical field of scanning display, in particular to an optical fiber scanning device and scanning display equipment.
Background
The imaging principle of the optical fiber scanning projection technology is as follows: the actuator in the optical fiber scanner drives the scanning optical fiber to move along a preset two-dimensional scanning track, the light emitting power of the light source is modulated, and information of each pixel point of an image to be displayed is projected onto an imaging area one by one, so that a projection picture is formed.
As shown in fig. 1, the conventional optical fiber scanning projection system includes: the device comprises a processor, a light source modulation module, a light source beam combining module, an optical fiber scanner and a scanning driving circuit. The processor controls the optical fiber scanner to vibrate and scan by sending an electric control signal to the scanning driving circuit, and simultaneously, the processor controls the light emitting power of the light source beam combining module by sending the electric control signal to the light source modulation module. The light source modulation module outputs a light source modulation signal according to the received electric control signal to modulate one or more color light source units (which can be lasers/light emitting diodes, and the like, and shown in the figure are red (R), green (G) and blue (B) three-color lasers) in the light source beam combining module, light generated by the light source units of each color in the light source beam combining module generates color and gray information of each pixel point one by one after being combined, and the combined light beam emitted by the light source beam combining module is guided into the optical fiber scanner through an optical fiber. Synchronously, the scanning drive circuit outputs a scanning drive signal according to the received electric control signal so as to control the scanning optical fiber in the optical fiber scanner to move along a preset two-dimensional scanning track.
However, in actual scanning operation, the optical fiber scanner may cause the motion trajectory and state to deviate from an ideal mode due to factors such as interference vibration, driving fluctuation, temperature and humidity, aging fatigue, etc., and it is difficult to stably scan light according to the driving signal, thereby possibly causing distortion of the displayed image, but there is no better detection method at present.
Disclosure of Invention
The invention aims to provide an optical fiber scanning device and scanning display equipment, which are used for improving the detection effect of the display equipment on the light emergent condition of an optical fiber scanner in the scanning projection process.
In order to achieve the above object, in a first aspect, the present invention provides an optical fiber scanning apparatus, comprising:
the optical fiber scanner comprises an actuator, and a scanning optical fiber and a feedback optical fiber which are fixedly arranged on the actuator; the part of the light-emitting end of the scanning optical fiber, which exceeds the actuator, forms an optical fiber cantilever, and the light-emitting end of the feedback optical fiber is fixed on the actuator;
the detection light source is connected with the input end of the feedback optical fiber and used for emitting detection light, and the detection light is emitted from the light emitting end of the feedback optical fiber after being transmitted by the feedback optical fiber;
and the optical detector is arranged on the light emitting path of the feedback optical fiber and used for receiving the emergent light of the feedback optical fiber and converting the received optical signal into an electric signal for feedback.
Optionally, the optical fiber scanning apparatus further includes a processor, configured to determine whether a motion trajectory of the actuator is the same as a calibration trajectory according to the electrical signal, and adjust a display image scanned and emitted by the optical fiber scanner according to the motion trajectory when the determination is different from the calibration trajectory, so that the display image is consistent with the calibration image.
Optionally, the optical fiber scanner includes a slow-axis actuating portion and a fast-axis actuating portion connected to the slow-axis actuating portion, a driving frequency of the slow-axis actuating portion is less than a driving frequency of the fast-axis actuating portion, and the photodetector is a one-dimensional detector and is configured to detect a moving direction of the slow-axis actuating portion in the actuator.
Optionally, the light emitting end of the feedback optical fiber is fixedly disposed on the slow axis actuating portion.
Optionally, the fast axis actuating portion and the slow axis actuating portion are fixedly connected through a connecting piece, and the light emitting end of the feedback optical fiber is fixedly disposed on the slow axis actuating portion, the connecting piece, or the fast axis actuating portion.
Optionally, the feedback fiber is a self-focusing fiber.
Optionally, the light exit end of the feedback optical fiber deviates from the light exit end of the scanning optical fiber by a preset angle.
Optionally, the optical fiber scanning device further includes:
and the light guide element is arranged on the light emitting path of the feedback optical fiber, is positioned between the feedback optical fiber and the optical detector, and is used for guiding the light emitted by the feedback optical fiber into the optical detector.
Optionally, the light guide element is a reflector or an imaging lens.
In a second aspect, an embodiment of the present invention provides a scanning display device, including an imaging light source and the optical fiber scanning apparatus according to the first aspect, where the imaging light source is configured to emit a light beam of an image to be displayed, and the light beam is coupled into the scanning optical fiber and then scanned by the optical fiber scanner to be emitted.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
in the embodiment of the invention, the scanning optical fiber and the feedback optical fiber are arranged on the actuator of the optical fiber scanner, the detection light is coupled into the feedback optical fiber through the detection light source, the detection light is transmitted through the feedback optical fiber and is emitted through the light emitting end, and the detection light hitting the target surface of the optical detector is converted into the electric signal for feedback, so that the information such as the motion track of the actuator (carried scanning optical fiber) in the optical fiber scanner can be obtained according to the electric signal, and the detection effect on the motion of the scanning optical fiber in the optical fiber scanner is effectively improved.
Furthermore, the motion trail of the actuator in the optical fiber scanner can be known through the processing of the processor on the electric signals, so that the working state of the optical fiber scanner is determined, and the scanning projection effect is improved.
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:
FIG. 1 is a schematic diagram of a prior art optical fiber scanning projection system;
FIG. 2 is a schematic structural diagram of an optical fiber scanning device according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an optical fiber scanner according to an embodiment of the present invention, in which a feedback fiber is added to an actuator;
FIG. 4 is a schematic diagram of a light guide element according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a scanning display device in an embodiment of the present 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.
Fig. 2 is a schematic structural diagram of an optical fiber scanning apparatus provided in an embodiment of the present invention, the optical fiber scanning apparatus includes an optical fiber scanner 10, a detection light source 20, and a light detector 30; the optical fiber scanner 10 includes a scanning optical fiber 101, a feedback optical fiber 102 and an actuator 103, wherein the scanning optical fiber 102 is fixedly disposed on the actuator 103, a part of a light-emitting end of the scanning optical fiber 101 exceeding the actuator 103 forms a fiber cantilever, and a light-emitting end of the feedback optical fiber 102 is fixedly disposed on the actuator 103; the detection light source 20 is connected to the input end of the feedback fiber 102, and is configured to emit detection light and couple the detection light into the feedback fiber 102, so that the detection light is emitted from the light emitting end of the feedback fiber 102 after being transmitted through the feedback fiber 102; further, the detection light impinges on the optical detector 30 disposed on the light exit path of the feedback fiber 102, and the optical detector 30 receives the light exiting from the feedback fiber 102 and can process the received optical signal of the detection light into an electrical signal, which can be used as a feedback signal.
In the conventional technology, when the optical fiber scanner 10 is used as an image source, in the display technology using the laser scanner, the requirement for the accuracy of the optical fiber scanner 10 is high, problems such as unstable scanned image and drift are likely to occur, and the optical fiber scanner 10 is susceptible to factors such as interference vibration, driving fluctuation, temperature and humidity, aging fatigue, and the like in the environment, so that it is difficult for the optical fiber scanner 10 to stably scan light according to the driving signal.
Therefore, the embodiment of the present invention provides that a feedback fiber 102 is additionally disposed on an actuator 103 of the fiber scanner 10, a light emitting end of the feedback fiber 102 is fixedly disposed on the actuator 103 and swings with the swing of the actuator 103, meanwhile, an input end of the feedback fiber 102 is connected to a detection light source 20, detection light (e.g., a light beam in a visible light/non-visible light band) emitted by the detection light source 20 is transmitted through the feedback fiber 102 and then emitted to a light detector through the light emitting end, and the detection light emitted by the feedback fiber 102 is converted into an electrical signal by the light detector to be used as a feedback signal, so that the swing condition of the actuator 103 can be determined according to the light emitting condition of the feedback fiber 102, and further the working state of the fiber scanner 10 during the scanning process can be determined.
In order to make those skilled in the art understand the technical solutions provided by the embodiments of the present invention, the near-eye display device provided by the embodiments of the present invention is illustrated in detail below.
In the embodiment of the present invention, the actuator 103 in the fiber scanner 10 may be a piezoelectric actuator, an electrostatic actuator, an electromagnetic actuator, or a MEMS (Micro-Electro-Mechanical System) actuator, and the actuator 103 is mainly used as the piezoelectric actuator in the present disclosure for illustration.
The actuator 103 can oscillate in multiple directions under the drive signal to cause the fiber cantilever of the scanning fiber 101 to scan in two dimensions. For example, the actuator 103 may include a slow-axis actuating portion and a fast-axis actuating portion connected to the slow-axis actuating portion, and the fast-axis actuating portion and the slow-axis actuating portion may be fixedly connected by an adhesive manner, a connecting member manner, or the like, or may be integrally formed; the driving frequency of the slow-axis actuator is lower than that of the fast-axis actuator, the slow-axis actuator can drive the fast-axis actuator to vibrate in a first direction, the fast-axis actuator can vibrate in a second direction, and the fiber cantilever of the scanning fiber 101 is finally driven to sweep in a synthetic direction of the first direction and the second direction, for example, the fiber cantilever can move according to a predetermined two-dimensional scanning trajectory, such as spiral scanning, grid scanning, lissajous scanning, and the like. Preferably, the first direction is a y-axis direction and the second direction is an x-axis direction. It should be noted that the term "sweeping in a certain direction" as used herein means sweeping back in that direction.
In the embodiment of the present invention, the optical fibers (the scanning optical fiber 101 and the feedback optical fiber 102) may be fixed on the actuator 103 along the extending direction of the actuator 103 by an adhesive (such as epoxy resin or other materials) or other materials with an adhesive function. The extending direction of the actuator 103 may be a direction in which the fixed end thereof is directed to the free end. The shape of the actuator 103 may be tubular (e.g., square/round tube, etc.) or rod-like (e.g., square/round rod, etc.). The feedback fiber 102 is preferably a self-focusing fiber, or an imaging lens may be further disposed between the light-emitting end of the feedback fiber 102 and the light detector to converge the light spot to improve the signal-to-noise ratio of the detection signal.
In practical applications, the scanning fiber 101 may be fixedly disposed on the actuator 103 along the extending direction of the actuator 103, which may be parallel to the central axis of the actuator 103, and the portion of the exit end of the scanning fiber 101 beyond the actuator 103 forms the aforementioned fiber cantilever. The light-emitting end of the feedback fiber 102 may be disposed at any position on the actuating portion of the actuator 103, such as the slow axis, the joint, and the fast axis, as long as the light detector can detect the detection light emitted correspondingly when the actuator 103 moves in the y-axis direction. Preferably, the feedback fiber 102 may be located on the slow axis actuator, i.e. the area where the motion trajectory of the actuator has a smaller amplitude, to reduce the detection range while avoiding being excessively affected by the vibration of the fast axis actuator. Further, the motion trace of the slow axis actuator in the fiber scanner 10 can be determined, and even whether the fiber scanner 10 is working stably or the working is affected can be determined according to the motion trace.
In order that the light detector is disposed at a position that does not interfere with the light output display of the scanning fiber 101, the light output end of the feedback fiber 102 may deviate from the light output end of the scanning fiber 101 by a certain angle, for example, the deviation angle between the feedback fiber 102 and the scanning fiber 101 may be 30 °, 60 °, or other angles, which may be set according to actual requirements, and this is not specifically limited in the embodiment of the present invention. Meanwhile, the light detector is disposed on the emergent light path of the feedback fiber 102, for example, the light detector may be disposed on the package housing of the fiber scanner 10. Referring to fig. 3, a schematic structural diagram of the optical fiber scanner 10 according to the present invention is shown, in which a feedback optical fiber 102 is added to an actuator 103. In fig. 3, reference numeral 1031 denotes a slow axis actuator, reference numeral 1032 denotes a connecting portion, and reference numeral 1033 denotes a fast axis actuator, and the light exit end of the feedback fiber 102 is angularly offset with respect to the light exit end of the scanning fiber 101. In fig. 3, the actuator 103 is a square tube, the fast axis actuating portion and the slow axis actuating portion are connected by a connecting portion, and the light emitting end of the feedback fiber 102 is fixedly disposed on the upper surface of the slow axis actuating portion of the actuator 103.
In order to improve the flexibility of the placeable position of the optical detector, in another embodiment, a light guide element may be further disposed between the feedback optical fiber 102 and the optical detector, and a designer may preset the light guide angle of the light guide mirror, the receiving angle of the optical detector and the placement position, so that during the swinging of the actuator 103, the light emitted from the feedback optical fiber 102 may be transmitted to the optical detector after being acted by the light guide element. The light guide element may be a reflective mirror, an imaging lens, etc., as shown in fig. 4 (which may correspond to the front view direction of fig. 3), and in the case shown in fig. 4, the light detector may be disposed at the bottom of the package, so that the detection light (as shown by an arrow) emitted from the feedback fiber 102 is reflected by the light guide element, such as a reflective mirror, and then hits on the target surface of the light detector at the bottom of the package.
The optical detector may detect the detection light included in the light emitted from the feedback optical fiber 102 and convert the detection light into an electrical signal. In the embodiment of the present invention, the optical Detector may be a PSD (Position Sensitive sensor), one or more optical detectors may be disposed in the optical fiber scanning apparatus, and the optical detectors may be disposed in the moving direction of the slow-axis actuator 103, for example, a plurality of optical detectors may be sequentially disposed in the moving direction of the slow-axis actuator to detect the moving track of the slow-axis actuator. Preferably, the light detector may be a one-dimensional detector. Then, a one-dimensional light detector may be disposed along the light-emitting path of the feedback fiber 102 along the moving direction (e.g., y-axis direction) of the slow-axis actuator 103, so that during the scanning projection of the fiber scanner 10, the light emitted from the feedback fiber 102 impinges on the light detector, and the moving direction of the slow-axis actuator can be determined by the electrical signal of the light detector, so as to determine the moving track of the slow-axis actuator 103.
In practical application, the target surface of the optical detector can be provided with a corresponding detection surface along the swing amplitude of the slow-axis actuating part on the y axis, so that the detection light can sweep over the target surface when moving in the y axis direction, and the detection sensitivity and the judgment accuracy of the detection light emitted by the slow-axis actuator 103 on the motion track can be improved. Depending on the different types of probe light, the reflective receivers may include, but are not limited to, the following structures:
the first condition is as follows: the detection light is visible light.
In this case, the photodetector is a general detector for detecting visible light. If an angle deviation exists between the light-emitting end of the feedback optical fiber 102 and the light-emitting end of the scanning optical fiber 101, the optical detector positioned on the light-emitting optical path of the feedback optical fiber 102 can directly receive the detection light; if there is no angular deviation between the light-emitting end of the feedback fiber 102 and the light-emitting end of the scanning fiber 101, the detection light may be mixed with the imaging light output by the scanning fiber 101, at this time, an optical filter for filtering out the detection light may be disposed at an incident light receiving window of the optical detector, and the passed detection light is transmitted to the optical detector.
The optical filter can adopt, but is not limited to, the following devices:
the two cut-off frequencies of the bandpass filter corresponding to the left and right side bands of the probe light may be, for example, the wavelength band corresponding to the probe light is [ f1, f2], and if the probe light is visible light, the bandpass filter may pass signals in the frequency range [ f1, f2] and attenuate other signals whose frequencies are not in the range to an extremely low level.
Alternatively, in practical applications, a combination of a short-wavelength pass filter and a long-wavelength pass filter may be used to achieve the same function of a band-pass filter, through the probe light. For example, a short-wave pass filter and a long-wave pass filter are stacked, and the cutoff frequency of the long-wave pass filter is set to f1, and the cutoff frequency of the short-wave pass filter is set to f2, and finally the signal of the probe light in the frequency range of [ f1, f2] can be passed.
The two band elimination filters respectively correspond to frequency ranges which can be as follows: a frequency range formed from a lower frequency limit of a visible light band (such as 400nm or 390nm) to a lower frequency limit of a detection light; secondly, the upper limit of the frequency of the detection light is within the frequency range formed by the upper limit of the frequency of the visible light (such as 760nm), so that other light before the detection light can be filtered and passes through the detection light.
Case two: the detection light is invisible light, such as infrared light or ultraviolet light.
In this case, the light detector may be an infrared light detector or an ultraviolet light detector corresponding to the invisible light, and the invisible light (infrared light or ultraviolet light) emitted from the feedback optical fiber 102 may be directly detected.
Alternatively, if the light detector is of a general type, for example, the detectable spectral range of which includes visible light and invisible light, a filter for filtering out the detection light (infrared light or ultraviolet light) may be provided at the receiving window of the light detector, and only the detection light is allowed to pass through and enter the light detector.
The optical filter can adopt, but is not limited to, the following devices:
the filter includes a single-sideband band-pass filter, such as a long-wavelength band-pass filter or a short-wavelength band-pass filter. If the probe light is infrared light, a short-wavelength pass filter with a cut-off wavelength of 770nm is used, or if the probe light is ultraviolet light, a long-wavelength pass filter with a cut-off wavelength of 400nm is used.
② the band-pass filter, the frequency range can be set according to the wave band/wavelength of the non-light. If the probe light is infrared light, the band pass filter has a frequency band corresponding to the frequency range of infrared light, such as 770nm, f3, where f3 may be 850nm or other infrared light frequency. If the probe light is ultraviolet light, the band pass filter may be in a frequency range corresponding to ultraviolet light, such as [ f4, 380nm ], where f4 may be 300nm or other frequencies corresponding to infrared light.
As can be seen from the above, different optical detectors may be adopted and/or the frequency band range of the optical filter may be selected and set according to the actual type and wavelength/wavelength band of the detection light, so that the optical filter may filter the signal of the imaging light through the signal of the detection light, thereby outputting the detection light to the optical detector.
Further, referring to fig. 5, the optical fiber scanning apparatus is further provided with a processor, for example, a Central Processing Unit (CPU) or the like, which can be used to determine a motion trajectory of a slow-axis actuating portion in the actuator 103 according to an electrical signal fed back by the optical detector, determine whether the motion trajectory of the slow-axis actuating portion is the same as a calibration trajectory, and adjust a display image scanned and emitted by the optical fiber scanner 10 according to the motion trajectory when the determination is different, for example, by a driving signal of the adjuster actuator 103 and/or a laser modulation signal of the imaging light source, so as to make the display image consistent with the calibration image, thereby avoiding distortion of the display image of the optical fiber scanning apparatus. The calibration image can be an original image corresponding to the display image, namely an undistorted image, and is updated in real time along with the display image; the calibration trajectory may be a motion trajectory detected in advance and corresponding to the slow-axis actuator when the optical fiber scanner 10 is in a normal operating state, for example, the motion direction, amplitude, phase, etc. of the actuator 103 on the y-axis may be detected in advance, so as to calculate the motion trajectory of the slow-axis actuator. In practical applications, a processor, a light source modulation module, a scan driving circuit, and the like may also be disposed in the scanning display device, and are also shown in fig. 5.
Specifically, the processor, after obtaining the electrical signal fed back by the optical detector, may include, but is not limited to, the following ways when determining whether the motion trajectory of the slow-axis actuator in the actuator 103 is the same as the calibration trajectory: 1. the processor judges whether the detected amplitude of the actuator 103 is consistent with the preset amplitude or not, if not, the driving signal is changed to compensate, and the motion track of the actuating part is promoted to be the same as the calibration track; 2. the processor determines whether the response track of the actuator 103 is consistent with the calibration track, and if not, the processor changes the driving signal or the laser modulation mode to compensate the image distortion caused by the track deviation; 3. the processor determines whether the response phase of the actuator 103 has changed and, if so, adjusts the value of the synchronization delay between the laser modulation and the scan drive accordingly to correct for image distortion caused by the phase change.
In the optical fiber scanner 10 according to the embodiment of the present invention, the light emitting end of the feedback optical fiber 102 is disposed on the actuator 103, and in the working process, referring to fig. 1, light emitted from the detection light source is transmitted through the feedback optical fiber 102, and is emitted from the fiber core end face of the light emitting end of the feedback optical fiber 102 and then strikes on the target surface of the optical detector, during which the light emitting end of the feedback optical fiber 102 swings along with the swing of the actuator 103, and the optical detector converts the detected optical signal into an electrical signal to obtain a corresponding feedback signal, so as to improve the monitoring effect on the scanning projection process of the optical fiber scanner 10, and contribute to enhancing the accuracy of the projection of the optical fiber scanning device.
Still referring to fig. 5, based on the same inventive concept, an embodiment of the present invention further provides a scanning display apparatus, which includes an imaging light source 30 and the optical fiber scanner 10, where the imaging light source 30 is configured to emit a light beam of an image to be displayed, the imaging light beam is coupled into the scanning optical fiber 101 and then scanned and emitted through the optical fiber scanner 10, and meanwhile, the detection light source 20 in the optical fiber scanner 10 is coupled into the feedback optical fiber 102 and transmitted and emitted through the feedback optical fiber 102 to reach the optical detector to form feedback informatization, so as to implement detection and feedback of the fiber oscillation condition of the optical fiber scanner 10 in a scanning projection process, and facilitate improvement of a scanning projection effect of the apparatus. The embodiments corresponding to fig. 1 to fig. 4 are also applicable to the scanning display device of this embodiment, and through the foregoing detailed description of the optical fiber scanning device, those skilled in the art can clearly know the implementation manner of the scanning display device in this embodiment, and for the brevity of the description, details are not repeated here.
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 (10)
1. An optical fiber scanning device, comprising:
the optical fiber scanner comprises an actuator, and a scanning optical fiber and a feedback optical fiber which are fixedly arranged on the actuator; the part of the light-emitting end of the scanning optical fiber, which exceeds the actuator, forms an optical fiber cantilever, and the light-emitting end of the feedback optical fiber is fixed on the actuator;
the detection light source is connected with the input end of the feedback optical fiber and used for emitting detection light, and the detection light is emitted from the light emitting end of the feedback optical fiber after being transmitted by the feedback optical fiber;
and the optical detector is arranged on the light emitting path of the feedback optical fiber and used for receiving the emergent light of the feedback optical fiber and converting the received optical signal into an electric signal for feedback.
2. An optical fiber scanning device according to claim 1, further comprising a processor for determining whether the motion trajectory of the actuator is the same as the calibration trajectory based on the electrical signal, and adjusting the display image scanned out by the optical fiber scanner based on the motion trajectory so as to be consistent with the calibration image when the determination is different.
3. The optical fiber scanning device according to claim 2, wherein the optical fiber scanner comprises a slow-axis actuator and a fast-axis actuator connected to the slow-axis actuator, the slow-axis actuator has a driving frequency lower than that of the fast-axis actuator, and the photodetector is a one-dimensional detector for detecting a moving direction of the slow-axis actuator in the actuator.
4. The fiber scanning device of claim 3, wherein the light exit end of the feedback fiber is fixedly disposed on the slow-axis actuator.
5. The fiber scanning device of claim 3, wherein the fast axis actuator and the slow axis actuator are fixedly connected by a connector, and the light emitting end of the feedback fiber is fixedly disposed on the slow axis actuator, the connector, or the fast axis actuator.
6. A fiber scanning device according to any of claims 1-5, wherein the feedback fiber is a self-focusing fiber.
7. An optical fiber scanning device according to claim 6, wherein the light exit end of the feedback optical fiber is offset from the light exit end of the scanning optical fiber by a predetermined angle.
8. The fiber scanning device of claim 7, further comprising:
and the light guide element is arranged on the light emitting path of the feedback optical fiber, is positioned between the feedback optical fiber and the optical detector, and is used for guiding the light emitted by the feedback optical fiber into the optical detector.
9. The fiber optic scanning device of claim 8, wherein the light directing element is a mirror or an imaging lens.
10. A scanning display device comprising an imaging light source for emitting a light beam of an image to be displayed, said light beam being coupled into said scanning optical fiber and scanned out by said optical fiber scanner, and an optical fiber scanning apparatus according to any of claims 1-9.
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| CN113414501A (en) * | 2021-07-27 | 2021-09-21 | 深圳市矢量科学仪器有限公司 | Laser engraving equipment and method based on fiber laser |
| CN115079403A (en) * | 2021-03-15 | 2022-09-20 | 成都理想境界科技有限公司 | Projection correction method and optical fiber scanning imaging system |
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