CN116661131A - A laser scanning imaging system - Google Patents

Abstract

The embodiment of the invention discloses a laser scanning imaging system, which includes a mounting base, an imaging surface, a reflection mirror, a laser and a controller. Wherein, the imaging surface faces the mounting seat, and the reflector and the laser are both arranged on the mounting seat. The laser is configured to emit light toward the reflector obliquely, so that the light is reflected to the imaging plane through the reflector. The controller is configured to control the rotation of the mount or the imaging surface and simultaneously control the reciprocating oscillation of the laser. Thus, the laser scanning imaging system realizes the laser scanning imaging of the curved area on the imaging surface, and has the advantages of simple structure, controllable cost, and the like. At the same time, the coordination accuracy requirements among the imaging surface, reflector and laser are relatively low, which helps to reduce the difficulty of design and control on the basis of ensuring the imaging effect.

Description

A laser scanning imaging system

technical field

The invention relates to the field of imaging technology, in particular to a laser scanning imaging system.

Background technique

Laser scanning imaging uses laser light as a light source to achieve imaging by scanning on the imaging surface in a preset manner. At present, flat panel display and VR display generally use methods such as LCD and OLED to control each pixel to realize matrix array display. For some scenes that only need to display curved areas, methods such as occlusion and corner cutting need to be used, resulting in a waste of pixels.

Contents of the invention

In view of this, the purpose of the present invention is to provide a laser scanning imaging system, which realizes the imaging of the curved area through the combined motion of rotation and swing.

An embodiment of the present invention provides a laser scanning imaging system. The laser scanning imaging system includes: a mounting seat; an imaging surface, the imaging surface facing the mounting seat; a mirror, the reflecting mirror being arranged on the mounting seat the laser, the laser is arranged on the mount, and is configured to emit light obliquely to the mirror so that the light is reflected to the imaging surface through the mirror; and the controller, the The controller is configured to control the rotation of the mount or the imaging surface, and simultaneously control the reciprocating swing of the laser.

In some embodiments, the mount is configured to rotate in a first plane; the imaging surface is fixed in a second plane, and the second plane is parallel to the first plane.

In some embodiments, the ratio of the swing period of the laser to the rotation period of the mount is 2N; wherein, N is a positive integer.

In some embodiments, the ratio of the swing period of the laser to the rotation period of the mount is N; wherein, N is a positive integer.

In some embodiments, the mirror surface of the reflector is located on a third plane; the laser is configured to reciprocate in a fourth plane, and the fourth plane is respectively perpendicular to the first plane and the third plane .

In some embodiments, the laser is configured to oscillate back and forth between a first position in which the laser forms a first angle of incidence and a second position in which the laser When the second incident angle is formed, the first incident angle is smaller than the second incident angle; when the laser is at the first position, the irradiation point of the light on the imaging surface is located at the on the axis of rotation.

In some embodiments, the included angle between the third plane and the first plane is 45°.

In some embodiments, the laser is parallel to the first plane at the third position; the swing angle of the laser when swinging from the third position to the second position is equal to The swing angle when the three positions swing to the first position.

In some embodiments, the swing speed of the laser is constant; the rotation speed of the mount is constant.

In some embodiments, the imaging plane is configured to rotate in a second plane; the mount is fixed to a first plane, and the first plane is parallel to the second plane.

The embodiment of the invention discloses a laser scanning imaging system, which includes a mounting base, an imaging surface, a reflection mirror, a laser and a controller. Wherein, the imaging surface faces the mounting seat, and the reflector and the laser are both arranged on the mounting seat. The laser is configured to emit light toward the reflector obliquely, so that the light is reflected to the imaging plane through the reflector. The controller is configured to control the rotation of the mount or the imaging surface and simultaneously control the reciprocating oscillation of the laser. Thus, the laser scanning imaging system realizes the laser scanning imaging of the curved area on the imaging surface, and has the advantages of simple structure, controllable cost, and the like. At the same time, the coordination accuracy requirements between the imaging surface, mirror and laser are relatively low, which helps to reduce the difficulty of design and control on the basis of ensuring the imaging effect.

Description of drawings

Through the following description of the embodiments of the present invention with reference to the accompanying drawings, the above and other objects, features and advantages of the present invention will be more clear, in the accompanying drawings:

FIG. 1 is a schematic diagram of the composition of a laser scanning imaging system provided by an embodiment of the present invention;

Fig. 2 is a schematic diagram of the operation of a laser scanning imaging system provided by an embodiment of the present invention;

Fig. 3 is a schematic diagram of parameters of a laser scanning imaging system provided by an embodiment of the present invention;

Fig. 4 is a schematic diagram of imaging in a polar coordinate system of a laser scanning imaging system provided by an embodiment of the present invention;

5 is a schematic diagram of imaging in a Cartesian coordinate system of a laser scanning imaging system provided by an embodiment of the present invention;

Fig. 6 is a comparison diagram of tangent values under two different laser swing intervals provided by the embodiment of the present invention;

FIG. 7 is a schematic diagram of another laser scanning imaging system provided by an embodiment of the present invention in a polar coordinate system.

Detailed ways

The present application is described below based on examples, but the present application is not limited only to these examples. In the following detailed description of the application, some specific details are set forth in detail. The present application can be fully understood by those skilled in the art without the description of these detailed parts. In order to avoid obscuring the essence of the present application, well-known methods, procedures, procedures, components and circuits have not been described in detail.

Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

For ease of description, spatially relative terms such as "inner", "outer", "below", "beneath", "lower", "above", "upper" and the like are used herein to describe an The relationship of an element or feature to another element or feature. It will be understood that the spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein should be interpreted accordingly.

Unless the context clearly requires, words like "including" and "including" throughout the application documents should be interpreted as an inclusive meaning rather than an exclusive or exhaustive meaning; that is, the meaning of "including but not limited to".

In the description of the present application, it should be understood that the terms "first", "second" and so on are used for descriptive purposes only, and should not be understood as indicating or implying relative importance. In addition, in the description of the present application, unless otherwise specified, "plurality" means two or more.

Figure 1 is a schematic diagram of the composition of a laser scanning imaging system provided by an embodiment of the present invention. As shown in Figure 1, the laser scanning imaging system includes a mounting base 1, an imaging surface 2, and a mirror 3 and a laser set on the mounting base 1. 4. Specifically, the laser 4 emits light obliquely toward the reflector 3 , so that the emitted light can be reflected by the reflector 3 to another direction. Further, the imaging surface 2 is set facing the mount 1 , so that the light emitted by the laser 4 can be reflected to the imaging surface 2 via the mirror 3 , so that the light scans and forms images on the imaging surface 2 .

Further, the laser scanning imaging system also includes a controller (not shown in the figure). It should be noted that the controller is configured to control the rotation of the mount 1 or the imaging surface 2 so that relative rotation occurs between the mount 1 and the imaging surface 2 , and the controller is also configured to control the laser 4 to swing back and forth. That is to say, when the mounting base 1 or the imaging surface 2 rotates, the laser 4 oscillates synchronously. Those skilled in the art can understand that the controller can be a computer (including personal computer, PC bus industrial computer, etc.), programmable logic controller (PLC), single-chip microcomputer or any other control system known in the art. Thus, the laser scanning imaging system uses the combination of rotation and swing to make the trajectory of the light emitted by the laser 4 on the imaging surface 2 form a curve, so that the laser scanning imaging of the curved area on the imaging surface 2 can be realized. It is easy to understand that the laser scanning imaging system only needs to rotate the mounting base 1 or the imaging surface 2 and oscillate the laser 4 synchronously, the movement structure is simple and the cost is controllable. On the other hand, the coordination precision among the imaging surface 2, the reflector 3 and the laser 4 is relatively low, which helps to reduce the difficulty of design and control while ensuring the imaging effect.

In one embodiment, the controller controls the mounting base 1 to rotate while the imaging surface 2 remains fixed, thereby realizing relative rotation between the mounting base 1 and the imaging surface 2 . Specifically, the mount 1 is configured to rotate in a first plane A. As shown in FIG. Exemplarily, the first plane A is a horizontal plane, and the mirror 3 and the laser 4 are arranged on the upper surface of the mount 1 . When the mount 1 rotates in the horizontal direction, the mirror 3 and the laser 4 follow the mount 1 to rotate in the horizontal direction, so that the light reflected by the mirror 3 can form a circular track on the imaging surface 2 . Further, the imaging surface 2 is fixed on the second plane B and faces the mount 1 , and the second plane B is parallel to the first plane A. As shown in FIG. That is to say, the second plane B is a horizontal plane above the first plane A. As shown in FIG. Thus, when the controller controls the mount 1 to rotate, the light emitted by the laser 4 can form a uniform circular track on the imaging surface 2 after being reflected by the mirror 3 , and then can form a smooth curved track with the swing of the laser 4 . It should be noted that, in this embodiment, the controller controls the mounting base 1 to rotate independently, so that the laser scanning imaging system only needs to set a set of action components for the mounting base 1, which helps to simplify the structure and reduce the cost. As an optional implementation, the controller can also control the rotation of the imaging surface 2 while controlling the rotation of the mounting base 1 so as to control the relative movement between the mounting base 1 and the imaging surface 2 as required. Surface 2 is respectively provided with a set of action components. It should be further explained that, in this embodiment, the second plane B is parallel to the first plane A, which helps to limit the overall structural size of the laser scanning imaging system. As an optional implementation manner, the second plane B may also be set as a plane having a certain angle with the first plane A, so as to design an appropriate optical path according to requirements.

In one embodiment, the mirror surface of the reflection mirror 3 is located on the third plane C. It is easy to understand that the mirror surface of the mirror 3 faces the imaging plane 2 and the laser 4 , and an included angle is formed between the third plane C and the first plane A. Thus, it is convenient to set the deflection angle of the laser 4 relative to the mount 1 , and the imaging surface 2 located on the second plane B can receive the reflected light without having an excessively large area. Further, the laser 4 is configured to reciprocate in a fourth plane D, and the fourth plane D is perpendicular to the first plane A and the third plane C respectively. It is easy to understand that, corresponding to the first plane A being a horizontal plane, the fourth plane D is a vertical plane perpendicular to the third plane C. Therefore, the swing of the laser 4 and the rotation of the mount 1 can form a relatively regular curved track on the imaging surface 2, which is helpful for designing the laser scanning track. It should be noted that, in this embodiment, the mirror surface of the mirror 3 is located on the third plane C intersecting the first plane A, so as to shorten the propagation distance of the light, thereby helping to limit the overall structural size of the laser scanning imaging system. As an optional embodiment, the mirror surface of the reflector 3 can also be arranged on the first plane A, and at the same time coordinately adjust the position of the imaging surface 2, so as to design a suitable optical path according to requirements.

Fig. 2 is a schematic diagram of the action of a laser scanning imaging system provided by an embodiment of the present invention, as shown in Fig. 1 and Fig. 2 , in one embodiment, the laser 4 is located in the fourth plane D reciprocating swing between the first position and the second position. Specifically, when the laser 4 is in the first position, a first incident angle a is formed, and when the laser 4 is in the second position, a second incident angle b is formed, and the first incident angle a is smaller than the second incident angle b. It can be seen from this that when the laser 4 is in the first position, its emitting end is closer to the first plane A, that is, closer to the mount 1 . Correspondingly, when the laser 4 is in the second position, its emitting end is closer to the second plane B, that is, closer to the imaging surface 2 . Further, when the laser 4 is in the first position, the emitted light is reflected by the mirror 3 , and the irradiation point on the imaging surface 2 is located on the rotation axis of the mount 1 . That is to say, when the laser 4 is in the first position, the normal line of the second plane B is drawn through the irradiation point on the imaging surface 2 , and the normal line coincides with the rotation axis of the mount 1 . Thus, when the laser 4 swings from the first position to the second position, or from the second position to the first position, since the mount 1 is rotating synchronously, the light emitted by the laser 4 can be reflected by the mirror 3 A complete helical track is formed on the imaging plane 2 .

In one embodiment, the oscillation speed of the laser 4 is constant. At the same time, the rotational speed of the mount 1 is constant. That is to say, the laser 4 and the reflector 3 follow the mount 1 and rotate around the rotation axis at a constant angular velocity. Thus, the light emitted by the laser 4 can form an Archimedes spiral trajectory on the imaging surface 2 after being reflected by the mirror 3 . Since the Archimedes spiral expands equidistantly in each rotation period, the formation of the Archimedes spiral trajectory can conveniently divide the pixel points according to the trajectory, thereby helping to obtain higher imaging quality.

In one embodiment, the included angle between the third plane C and the first plane A is 45°. That is to say, the angle between the mirror surface of the reflecting mirror 3 and the mount 1 is 45°. In this way, on the basis of limiting the deflection angle of the laser 4 and limiting the size of the mirror surface, the light can form a track that meets requirements on the imaging surface 2 . That is to say, the coordination precision among the imaging surface 2 , the reflector 3 and the laser 4 is relatively low, which helps to reduce the difficulty of design and control while ensuring the imaging effect. As an optional implementation, the angle between the third plane C and the first plane A can also be set to 30°, 60° or other degrees, and at the same time, one of the imaging surface 2, the mirror 3 and the laser 4 needs to be adjusted. Or more adjustments in position and size, so as to design a suitable optical path according to needs, so that the light can form a required trajectory on the imaging surface 2 .

In one embodiment, the laser 4 is parallel to the first plane A in the third position. Corresponding to the first plane A being a horizontal plane, the laser 4 is kept horizontal in the third position. Further, the swing angle when the laser 4 swings up from the third position to the second position is equal to the swing angle when the laser 4 swings down from the third position to the first position. That is to say, the third position is the swing balance position of the laser 4 . It is easy to understand that, corresponding to the angle between the third plane C and the first plane A of 45°, when the light emitted by the laser 4 is directed toward the reflector 3 along the horizontal direction, it is reflected by the reflector 3 and then along the vertical direction Shooting to image plane 2. Therefore, by using the third position as the swing balance position of the laser 4 , the optical path can be efficiently designed, thereby helping to reduce design difficulty and control difficulty on the basis of ensuring the imaging effect. It should be noted that, in this embodiment, the third position, that is, the horizontal position is the swing balance position of the laser 4 . As an optional embodiment, other positions can also be selected as the swing balance position of the laser 4, that is, the laser 4 has different swing intervals, so that an appropriate optical path can be designed according to needs, so that the light can be on the imaging surface 2 form the desired trajectory. Fig. 6 is a comparison diagram of tangent values under two different laser swing intervals provided by the embodiment of the present invention. As shown in Fig. 6, in the two cases where the swing angle is the same as 45°, the swing balance position is at the horizontal position The first change curve m is smoother than the second change curve n when the tilt angle of the swing equilibrium position relative to the horizontal position is 22.5°. That is to say, setting the swing balance position at a horizontal position helps to reduce design difficulty and control difficulty.

In one embodiment, the ratio of the swing period of the laser 4 to the rotation period of the mount 1 is 2N, where N is a positive integer. Specifically, the oscillating period of the laser 4 is denoted as T ₁ , and the oscillating frequency is denoted as f ₁ ; the rotational period of the mount 1 is denoted as T ₂ , and the rotational frequency is denoted as f ₂ . Then the ratio of the oscillation period T ₁ of the laser 4 to the rotation period T ₂ of the mount 1 in this embodiment is T ₁ /T ₂ =2N, and the oscillation frequency f ₁ of the laser 4 is related to the rotation frequency f ₂ of the mount 1 The ratio is f ₁ /f ₂ =1/2N. That is to say, when the laser 4 swings from the first position to the second position, or when the laser 4 swings from the second position to the first position, the mount 1 rotates N times. Wherein, the swing frequency _f1 of the laser 4 determines the refresh rate of the imaging picture. The size of N determines the resolution of the imaging picture, that is, affects the fineness of the imaging picture display. Thus, the required imaging frame refresh rate and resolution can be obtained by adjusting the swing parameters of the laser 4 and the rotation parameters of the mount 1 .

It should be noted that the coordinate system is established with the irradiation point on the imaging surface 2 when the laser 4 is in the first position as the origin, corresponding to the ratio of the swing period T1 of the laser ₄ to the rotation period T2 of the mount ₁ as _T1 /T ₂ =2N, the polar coordinate trajectory equation of the Archimedes spiral trajectory formed on the imaging surface 2 after the light emitted by the laser 4 is reflected by the mirror 3 is:

Wherein, Fig. 3 is a schematic diagram of parameters of a laser scanning imaging system provided by an embodiment of the present invention, as shown in Fig. 3, h ₁ is the horizontal distance from the swing center point of the laser 4 to the reflector 3, and h ₂ is the horizontal distance of the laser 4 The vertical distance from the swing center point to the imaging plane 2, α is the angle at which the laser 4 rotates from the third position to the first position or the second position. Further, γ is the instantaneous value of the inclination angle of the laser 4 relative to the horizontal position, and is positive for upward and negative for downward. Furthermore, θ is the instantaneous value of the rotation of the mount 1 .

Thus, the Cartesian coordinate trajectory equation of the Archimedes spiral trajectory formed on the imaging surface 2 after the light emitted by the laser 4 is reflected by the mirror 3 can be obtained, which is:

According to the ratio of the swing period _T1 of the laser 4 to the rotation period _T2 of the mount 1 as _T1 / _T2 =2N, it can be further obtained:

Wherein, N is a positive integer.

Exemplarily, the value of α is π/8, the value of N is 50, the value of h ₁ is 0.4, the value of h ₂ is 0.6, and the value range of θ is [0,100π]. Then the Cartesian coordinate trajectory equation of the Archimedes spiral trajectory formed on the imaging surface 2 after the light emitted by the laser 4 is reflected by the mirror 3 is:

Among them, θ∈[0,100π]. Then, the formed Archimedes spiral trajectory is shown in FIG. 4 and FIG. 5 .

As an optional implementation manner, the ratio of the swing period of the laser 4 to the rotation period of the mount 1 is N, where N is a positive integer. Specifically, the oscillating period of the laser 4 is denoted as T ₁ , and the oscillating frequency is denoted as f ₁ ; the rotational period of the mount 1 is denoted as T ₂ , and the rotational frequency is denoted as f ₂ . Then _the ratio of the oscillation period T ₁ of the laser 4 to the rotation period T 2 of the mount 1 in this embodiment is T ₁ /T ₂ =N, and the oscillation frequency f ₁ of the laser 4 and the rotation frequency f ₂ of the mount 1 The ratio is f ₁ /f ₂ =1/N. That is to say, when the laser 4 swings from the first position to the second position, and then swings from the second position to the first position, the mounting base 1 rotates N times. Wherein, the swing frequency _f1 of the laser 4 determines the refresh rate of the imaging picture. The size of N determines the resolution of the imaging picture, that is, affects the fineness of the imaging picture display. Thus, the required imaging frame refresh rate and resolution can be obtained by adjusting the swing parameters of the laser 4 and the rotation parameters of the mount 1 . Fig. 7 is an imaging schematic diagram of another laser scanning imaging system provided by the embodiment of the present invention in the polar coordinate system. As shown in Fig. 7, in this embodiment, the light rays will repeat at some points on the imaging surface 2 scanning, but the overall image quality of the imaging screen will be improved accordingly.

In one embodiment, the controller controls the imaging surface 2 to rotate, while the mounting base 1 remains fixed, thereby realizing relative rotation between the mounting base 1 and the imaging surface 2 . Specifically, the imaging surface 2 is configured to rotate in the second plane B. Exemplarily, the second plane B is a horizontal plane. Further, the mounting base 1 is fixed on the first plane A, and the first plane A is parallel to the second plane B. As shown in FIG. That is to say, the first plane A is a horizontal plane below the second plane B. As shown in FIG. Meanwhile, the reflector 3 and the laser 4 are arranged on the upper surface of the mount 1 , so that the imaging surface 2 can receive light reflected by the reflector 3 when facing the mount 1 . When the imaging surface 2 rotates in the horizontal direction, the reflective mirror 3 and the laser 4 fixed on the mounting base 1 realize relative rotational movement with the imaging surface 2, so that the light reflected by the reflective mirror 3 can be reflected on the imaging surface 2 form a circular trajectory. Thus, when the controller controls the rotation of the imaging surface 2, the light emitted by the laser 4 can form a uniform circular trajectory on the imaging surface 2 after being reflected by the mirror 3, and then can form a smooth curved trajectory with the swing of the laser 4. It should be noted that, in this embodiment, the controller controls the imaging surface 2 to rotate independently, so that the laser scanning imaging system only needs to set a set of action components for the imaging surface 2, which helps to simplify the structure and reduce the cost. As an optional implementation, the controller can also control the rotation of the mounting base 1 while controlling the rotation of the imaging surface 2 so as to control the relative movement between the mounting base 1 and the imaging surface 2 as required. Surface 2 is respectively provided with a set of action components. It should be further explained that, in this embodiment, the second plane B is parallel to the first plane A, which helps to limit the overall structural volume of the laser scanning imaging system. As an optional implementation manner, the second plane B may also be set as a plane having a certain angle with the first plane A, so as to design an appropriate optical path according to requirements.

The embodiment of the invention discloses a laser scanning imaging system, which includes a mounting base, an imaging surface, a reflection mirror, a laser and a controller. Wherein, the imaging surface faces the mounting seat, and the reflector and the laser are both arranged on the mounting seat. The laser is configured to emit light toward the reflector obliquely, so that the light is reflected to the imaging plane through the reflector. The controller is configured to control the rotation of the mount or the imaging surface and simultaneously control the reciprocating oscillation of the laser. Thus, the laser scanning imaging system realizes the laser scanning imaging of the curved area on the imaging surface, and has the advantages of simple structure, controllable cost, and the like. At the same time, the coordination accuracy requirements between the imaging surface, mirror and laser are relatively low, which helps to reduce the difficulty of design and control on the basis of ensuring the imaging effect.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, various modifications and changes may be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (10)

1. A laser scanning imaging system, characterized in that, the laser scanning imaging system comprises: mount; an imaging surface, the imaging surface facing the mount; a reflector, the reflector is arranged on the mount; a laser, the laser is disposed on the mount and is configured to emit light obliquely toward the reflector so that the light is reflected to the imaging surface via the reflector; and a controller, the controller is configured to control the rotation of the mount or the imaging plane, and simultaneously control the reciprocating swing of the laser. 2. The laser scanning imaging system according to claim 1, wherein the mount is configured to rotate in a first plane; The imaging plane is fixed on a second plane, and the second plane is parallel to the first plane. 3. The laser scanning imaging system according to claim 2, wherein the ratio of the swing period of the laser to the rotation period of the mount is 2N; Wherein, N is a positive integer. 4. The laser scanning imaging system according to claim 2, wherein the ratio of the swing period of the laser to the rotation period of the mount is N; Wherein, N is a positive integer. 5. The laser scanning imaging system according to claim 2, wherein the mirror surface of the reflecting mirror is located on a third plane; The laser is configured to oscillate back and forth in a fourth plane which is respectively perpendicular to the first plane and the third plane. 6. The laser scanning imaging system according to claim 5, wherein the laser is configured to reciprocate between a first position and a second position, and the laser forms a first position when in the first position. an angle of incidence, the laser forms a second angle of incidence when the laser is in the second position, the first angle of incidence is smaller than the second angle of incidence; When the laser is at the first position, the irradiation point of the light on the imaging plane is located on the rotation axis of the mount. 7. The laser scanning imaging system according to claim 6, wherein the included angle between the third plane and the first plane is 45°. 8. The laser scanning imaging system according to claim 7, wherein the laser is parallel to the first plane when in the third position; The swing angle when the laser swings from the third position to the second position is equal to the swing angle when the laser swings from the third position to the first position. 9. The laser scanning imaging system according to claim 2, wherein the swing speed of the laser is constant; The rotational speed of the mount is constant. 10. The laser scanning imaging system according to claim 1, wherein the imaging surface is configured to rotate in a second plane; The mounting base is fixed on a first plane, and the first plane is parallel to the second plane.