TW202349101A - Light path adjustment mechanism - Google Patents

Abstract

A light path adjustment mechanism includes a carrier, an optical element, and an actuator that receives a drive signal. During the rise time in one period of the driving signal, at the stage when the voltage value continually increases would not be then subject to a decrease in voltage value. During the falling time in one period of the driving signal, at the stage when the voltage value continually decreases would not be then subject to an increase in voltage value.

Description

Optical path adjustment mechanism

The invention relates to an optical path adjustment mechanism.

In recent years, various image display technologies have been widely used in daily life. In an image display device, for example, an optical path adjustment mechanism can be provided to change the optical path of light in the device to provide various effects such as improving imaging resolution and improving picture quality. However, the conventional optical path adjustment mechanism has a large number of components, weight, and volume, making it difficult to further miniaturize it. Therefore, there is an urgent need for an optical path adjustment mechanism design that has a simple structure, high reliability, and can significantly reduce weight and volume.

Other objects and advantages of the present invention can be further understood from the technical features disclosed in the present invention. In order to make the above and other objects, features and advantages of the present invention more obvious and understandable, the following embodiments are described in detail with reference to the accompanying drawings.

According to one aspect of the present invention, an optical path adjustment mechanism is provided, including a bearing base, an optical element and a first actuator. The optical element is arranged on the bearing base, the first actuator is used to make the optical element move around the first axis, and the first actuator receives the first driving signal. The first driving signal meets the following characteristics: the first driving signal only includes one pulse rising section and one pulse falling section in one cycle, the voltage value of the first driving signal does not decrease after increasing during the pulse rising section, and During the pulse falling period, the voltage value decreases and then does not increase.

According to the above viewpoints of the present invention, the frequency response in the mid-to-high frequency band can be reduced, the noise of the optical element operation can be reduced, and the control of the swing angle can be made more stable and precise.

According to one aspect of the present invention, an optical path adjustment mechanism is provided, including a bearing base, an optical element and a first actuator. The optical element is arranged on the bearing seat, and the first actuator is used to move the optical element with the first axis as its axis. The first actuator receives the first driving signal, and the first driving signal only includes a pulse rising segment and a pulse falling segment in one cycle. During the pulse rising section of the first driving signal, the relative curve change of the voltage value of the first driving signal with time only has a section where the slope is substantially greater than or equal to zero. During the pulse falling section of the first driving signal, the first driving signal The relative curve change of the voltage value of the driving signal versus time only has a section where the slope is substantially less than or equal to zero.

According to the above point of view of the present invention, the response of different frequency bands outside the fundamental frequency can be reduced, and the response reduction effect is better especially in the even-numbered frequency band. Therefore, the noise of the operation of the optical element can be reduced and the control of the swing angle can be more stable. and precise.

Other objects and advantages of the present invention can be further understood from the technical features disclosed in the present invention. In order to make the above and other objects, features and advantages of the present invention more obvious and understandable, the following embodiments are described in detail with reference to the accompanying drawings.

The terms "first" and "second" used in the following embodiments are for the purpose of identifying the same or similar technical contents, features and functions mentioned above in the present invention. In the following detailed description of the embodiments with reference to the drawings, , will be clearly displayed. components used. Directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only for reference to the directions in the attached drawings. Accordingly, the directional terms used are illustrative and not limiting of the invention.

The disclosure in the following embodiments discloses an optical path adjustment mechanism that can be used in different optical systems (such as display devices, projection devices, etc.) to adjust or change the optical path to provide, for example, improved imaging resolution and improved image quality (elimination of darkening). area, softening image edges) and other effects are not limited, and the setting position and configuration method of the optical path adjustment mechanism in the optical system are not limited at all.

FIG. 1 is an exploded view of the optical path adjustment mechanism according to an embodiment of the present invention. FIG. 2 is a schematic plan view of the optical path adjustment mechanism in FIG. 1 after assembly. As shown in FIG. 1 , the optical path adjustment mechanism 100 includes a bearing seat 110 , a base 120 , a magnet seat 130 , a bracket 140 , a first pair of flexible members 152 , and a second pair of flexible members 154 . The carrying base 110 includes an inner frame 112 and an outer frame 114. The outer frame 114 is located outside the inner frame 112 and is connected to the inner frame 112 through a first pair of flexible members 152. The inner frame 112 and the outer frame 114 can, for example, have the same structure. Horizontal height. The outer frame 114 of the carrying base 110 can be connected to the base 120 through a second pair of flexible members 154 . The bearing seat 110 and the base 120 can be disposed on one side of the bracket 140 , and the magnet seat 130 can be disposed on the other side of the bracket 140 . In this embodiment, the bracket 140 has a U-shaped shape with a first side 142, a second side 144, and a third side 146, and can form a gap 140a for other optical components to be inserted or passed through. Furthermore, the optical path adjustment mechanism 100 may include an optical element 180 and a plurality of actuators. The optical element 180 can be disposed on the carrying base 110, and for example, can be disposed on the inner frame 112 of the carrying base 110. The optical element 180 can be, for example, a lens, and the lens only needs to be able to provide the effect of deflecting light, and its form and The type is not limited, for example, it can be a lens (Lens) or a mirror (Mirror). In this embodiment, the plurality of actuators may include, for example, the actuator 160 and the actuator 170 located on two different sides of the optical element 180. The actuator 160 may include, for example, a coil 162 and a magnet 164, and the actuator 160 may include a coil 162 and a magnet 164. The device 170 may include, for example, a coil 172 and a magnet 174. The magnets 164 and 174 may be fixed on the magnet base 130. Therefore, when the magnet base 130 is fixed on one side of the bracket 140, the magnets 164 and 174 may be fixed on the bracket 140 accordingly. The coil 162 can be fixed on one side of the optical element 180, and the other coil 172 can be fixed on a coil holder 176. The coil holder 176 can be fixed on the outer frame 114 of the carrying base 110, so that the coil 172 can be fixed on the outer frame of the carrying base 110. 114 on. In addition, the above-mentioned bearing seat 110, base 120 and magnet seat 130 can be respectively connected and fixed to the bracket 140 through fixing members 190 of screws or pins, for example. In another embodiment, the base 120 can also be composed of a part of the bracket 140. Since the base 120 can be directly fixed to the bracket 140 or can be a part of the bracket 140, the outer frame 114 of the bearing base 110 can be formed by the second Pair of flexures 154 is connected to bracket 140 . Furthermore, in one embodiment, a lens holder 192 can be disposed against the periphery of the optical element 180 to help position the optical element 180 .

As shown in FIG. 2 , the first pair of flexible members 152 connected between the inner frame 112 and the outer frame 114 may form, for example, a first axis parallel to the X-axis direction, and be connected to the outer frame 114 and the base 120 (bracket 140 ) may form a second axis parallel to the Y-axis direction. In this embodiment, the actuator 160 and the actuator 170 are respectively disposed on adjacent two sides of the optical element 180 at right angles to each other, but the invention is not limited thereto. The magnetic attraction or magnetic repulsion generated by the actuator 160 (including the coil 162 provided on the optical element 180 and the magnet 164 provided on the bracket 140 as shown in FIG. 1 ) when energized can act on one end of the optical element 180 so that the optical element 180 Together with the inner frame 112 , the first pair of flexible members 152 shown in FIG. 2 is swung back and forth in the axial direction (X-axis). In the same way, the magnetic attraction or magnetic repulsion generated by the actuator 170 (including the coil 172 provided on the outer frame 114 of the carrier base and the magnet 174 provided on the bracket 140 as shown in FIG. 1 ) when energized can act on the outer frame 114 of the carrier base. At one end, the optical element 180 together with the outer frame 114 is reciprocally swung with the axial direction (Y-axis) of the second pair of flexible members 154 shown in FIG. 2 as the axis. Therefore, the optical element 180 can generate two swing angle ranges in different axes, swing back and forth or rotate to different positions to deflect the incident light to different directions, thereby achieving the effect of adjusting or changing the optical path of the light. For example, the optical element 180 can rapidly swing in two different axes to produce four different tilt positions relative to the bracket 140. Therefore, a pixel image originally incident on the optical element 180 is rapidly changed in four different tilt positions. The deflection of the optical element 180 can produce four pixel images, achieving the effect of increasing the pixel resolution to 4 times. By adjusting or changing the light path through the light path adjustment mechanism of the embodiment of the present invention, different effects can be produced depending on actual needs. For example, it can be used to improve projection resolution, improve image quality (eliminate dark areas, soften image edges), etc. without limitation. Furthermore, through the design of the above embodiment, because part of the structure of the actuator can be directly installed on the bearing seat, the overall volume, weight or number of components of the optical path adjustment mechanism can be reduced, and only one side of the actuator is provided for each axis. The device can further reduce the size and weight and reduce manufacturing costs.

3A is a schematic diagram showing the optical path adjustment mechanism and other optical elements in an optical system according to an embodiment of the present invention. As shown in FIG. 3A , in the optical system 200 , the optical path adjustment mechanism 100 may be disposed adjacent to the light valve module 210 and the lens 220 . The light valve module 210 may be, for example, a digital micro-mirror device (DMD), a silicon-based liquid crystal panel (liquid-crystal-on-silicon panel, LCOS panel) or a transmissive liquid crystal panel, and The prism 220 may be, for example, a total internal reflection prism (TIR Prism), a reverse total internal reflection prism (RTIR Prism), or a polarization spectroscopy prism (PBS prism), etc., without limitation. In one embodiment, since a gap 140a can be formed at one end of the bracket 140, a part of the light valve module 210 can extend into the gap 140a of the bracket 140. Therefore, the optical path adjustment mechanism 100 can avoid the light valve module 210 so that after assembly The position is closer to the 220, which can further reduce the overall size and shorten the back focus of the lens. FIG. 3B is a schematic diagram illustrating an example of the arrangement relationship between the light valve module and the optical path adjustment mechanism in FIG. 3A . Here, a surface of the light valve module 210 is defined as the surface of the outermost component (such as the glass protective cover 212) on the side that outputs the image beam. For example, if the light valve module 210 in FIG. 3A is a digital micromirror component, the surface 210a of the light valve module 210 may be the surface of the glass protective cover 212. In other embodiments, if the light valve module 210 is a silicon-based liquid crystal panel, the surface 210a of the light valve module 210 can be the surface of the glass substrate; if the light valve module 210 is a transmissive liquid crystal panel, Then the surface 210a of the light valve module 210 can be the surface of the polarizing plate. As shown in FIG. 3B , the normal line N of the surface 210 a of the light valve module 210 and the bracket 140 have an intersection point P closest to the surface 210 a. That is, the intersection point P is the intersection point P that may be formed by the intersection of the normal line N of the surface 210 a and the bracket 140 . Among the intersection points, the intersection point closest to surface 210a. Furthermore, the bracket 140 has an end point Q that is farthest from the intersection point P when projected on the normal line N. In one embodiment, the distance D1 between the intersection point P and the surface 210 a on the normal line N can be configured to be smaller than the end point Q. The distance D2 between the projection point C projected on the normal line N and the intersection point P on the normal line N allows the light valve module 210 to be closer to, for example, the lens 180a and the lens 220 shown in FIG. 3A , thereby reducing the overall volume and enabling The effect of shortening lens back focus. In one embodiment, as shown in FIG. 3A , the optical element 180 can be a lens 180a. The shortest distance between the surface of the lens 180a and the lens 220 can be less than 3 mm, and the surface of the optical element 180 (lens 180a) is connected to the light valve mold. The surfaces 210a of the groups 210 may be spaced less than 1 mm apart. It should be noted that in the above embodiments, the U-shaped shape of the bracket 140 is only an example and not limiting. The bracket 140 only needs to have a part of the extension that allows the light valve module 210 (or other components that may interfere with the optical path adjustment mechanism in space). It can fit into the space, and its appearance is not limited at all. In another embodiment, as shown in FIG. 3C , the bracket 140 can be extended to form a lug structure 140c at one end adjacent to the light valve module 210, and the light valve module 210 can be placed into the area surrounded by the lug structure 140c. The opening 140d, that is, the bracket 140 only needs to form a gap or extension corresponding to the light valve module 210 at one end adjacent to the light valve module 210, and the gap or extension can define a space for accommodating at least part of the light valve module 210. This can achieve the effect of allowing the assembled position of the optical path adjustment mechanism 200 to be closer to the lens 220.

Furthermore, the distribution manner of the components (such as magnets and coils) of the actuator in the above embodiments is only an illustration and is not limiting. For example, please refer to Figure 4. To make the optical element 180 swing with the first pair of flexible members 152 as the axis (X-axis direction), a part 160a (magnet or coil) of the actuator needs to be located on the optical element 180 or The inner frame 112 of the bearing base (for example, position X1), and the other part 160b (coil or magnet) can be disposed on the outer frame 114 of the bearing base, the base 120 or the bracket 140 (eg, position X2 or X3). Furthermore, in order to make the optical element 180 swing with the second pair of flexible members 154 as the axis (Y-axis direction), a part of the actuator 170a (magnet or coil) needs to be located on or on the outer frame 114 of the carrier (for example, position Y1 ), and the other part 170b (coil or magnet) can be disposed on the optical element 180, the inner frame 112 of the carrier, the base 120 or the bracket 140 (for example, position Y2 or position Y3 can be used).

In one embodiment, the bearing seat 110, the base 120, the magnet seat 130, the bracket 140, the first pair of flexible members 152, and the second pair of flexible members 154 may be integrally formed using the same material, or two or more of them may be made of the same material. Each component can be formed in one piece and then combined with other components. For example, the bearing seat 110 , the base 120 , the bracket 140 , the first pair of flexible members 152 and the second pair of flexible members 154 can be integrally formed using the same material and then connected to the magnet base 130 . Furthermore, in one embodiment, a structure for accommodating magnets can also be directly formed on the bracket 140 and the magnet seat 130 can be omitted.

According to the design of each of the above embodiments, a method for manufacturing an optical path adjustment mechanism can be provided. For example, a bracket and a light valve module are first provided, and then a bearing seat is provided on the bracket to carry an optical element. The light valve module has a surface. A normal line of the surface has an intersection point closest to the surface with the bracket. The bracket has an end point projected on the normal line farthest from the intersection point, and the distance between the intersection point and the surface on the normal line is less than the end point projected on The distance between the projection point on the normal and the intersection point. Furthermore, a first pair of flexible members may be provided to connect the inner frame and the outer frame of the bearing base, and a second pair of flexible members may be provided to connect the bearing base and the bracket, and then only one of the two sides of the first shaft An actuator is provided on one side of the second shaft, and another actuator is provided on only one side of both sides of the second shaft.

FIG. 5 is a schematic diagram of a driving signal used by an actuator according to an embodiment of the present invention. As shown in FIG. 5 , the driving signal S in this embodiment can be a periodic stepped square wave, and each cycle time can include, for example, a lowest potential interval P1, a pulse rise time P2, a highest potential interval P3, and During a pulse fall time P4, the optical element maintains one swing position in the lowest potential interval P1, and the optical element maintains another swing position in the highest potential interval P3, and the optical element is stabilized by the pulse rise time P2 and the pulse fall time P4. 180 changes between two different swing positions. In this embodiment, the lowest potential interval P1 has the lowest potential SV of the drive signal S, the highest potential interval P3 has the highest potential SP of the drive signal S, and the pulse rise time P2 changes with time from the lowest potential SV to the highest potential SP, and The pulse falling time P4 changes with time from the highest potential SP position to the lowest potential SV. According to the design of this embodiment, the voltage value of the pulse rise time P2 in each cycle gradually increases and there is a flat section F that does not substantially change with time, so a rising step-like waveform is generated without an increase. and then decrease the voltage value change. The voltage value of the pulse falling time P4 in each cycle gradually decreases and has a flat section F that does not change with time. Therefore, a descending step-like waveform is generated and does not have a voltage value change that decreases and then increases. In this embodiment, the voltage value of each flat section F is between the highest potential SP and the lowest potential SV, and each flat section is defined as the voltage value change (ie, the highest voltage value and the lowest voltage in the flat section The difference in values) is less than 0.1% of the difference between the highest potential SP and the lowest potential SV. Furthermore, in one embodiment, the absolute value of the slope of the flat section F is less than 1 V/ms.

FIG. 6 is a schematic diagram of different swing positions produced by driving the optical element using the driving signal of FIG. 5 . For example, when the actuator 160 receives the lowest potential interval P1 of the driving signal S, the actuator 160 actuates the optical element 180 to change to the position M, and when the actuator 160 receives the highest potential interval P3 of the driving signal S When , the actuator 160 actuates the optical element 180 to change to the position L. The optical element 180 can be changed between the position M and the position L by the pulse rise time P2 and the pulse fall time P4. The optical element 180 is deflected by an angle θ between the position M and the position L, and the amplitude of the lowest potential interval P1 and the highest potential interval P3 can determine the size of the angle θ.

Figure 7 shows the Fourier series frequency component distribution diagram of the swing generated by the driving signal of Figure 5 (the changing section is a staircase waveform), and Figure 8 shows the Fourier series frequency component distribution diagram of the swing generated by using the driving signal of Figure 9 (the changing section is a sine wave waveform). Fourier series frequency component distribution plot of the oscillation. Comparing the dotted box parts of Figure 7 and Figure 8, it can be clearly seen that using the driving signal with a stepped waveform in the changing section of Figure 7 can reduce the frequency response in the mid-to-high frequency range (such as 300-780Hz) to reduce the noise of the optical element operation. And make the control of the swing angle more stable and precise. In one embodiment, when the pulse rise time P2 and the pulse fall time P4 of one cycle are respectively between 0.8-1.0 ms, the frequency response reduction effect is better.

According to the design of each of the above embodiments, a manufacturing method of an optical path adjustment mechanism can be provided. For example, firstly, a first axis and a second axis are set on a bearing base, and then an optical element is set on the bearing base. Furthermore, an actuator may be provided on one side of the first shaft, and another actuator may be provided on one side of the second shaft. Each actuator can cause the optical element to change between at least a first swing position and a second swing position according to a driving signal, and the driving signal has a voltage value that does not substantially change with time during the pulse rise time of one period. A first flat section has a second flat section whose voltage value does not substantially change with time during the pulse falling time of the cycle time of the driving signal. The voltage values of the first flat section and the second flat section are both equal. It is located between the highest potential and the lowest potential in the cycle time of the first driving signal, and the voltage value change of each flat section is less than 0.1% of the difference between the highest potential and the lowest potential.

FIG. 10 is a schematic diagram of a driving signal used by an actuator according to another embodiment of the present invention. In this embodiment, two actuators 160 can be disposed on both sides of the first pair of flexible members 152 (in the X-axis direction). The two actuators 160 can input two different signals to cooperatively control the optical element 180 in the X-axis direction. For the swing of the axis, two actuators 170 can be provided on both sides of the second pair of flexible members 154 (in the Y-axis direction). The two actuators 170 can input two different signals to cooperatively control the optical element 180 in the Y-axis direction. The direction is the swing of the axis. Figure 10 shows the waveforms of two different signals S1 and S2 for each axis (such as the X-axis direction or the Y-axis direction). According to the design of this embodiment, the signal with the smaller amplitude is S1 and has the amplitude A1, and the signal with the larger amplitude is S1 and has the amplitude A1. The signal is S2 and has amplitude A2. When the amplitude ratio A2/A1 of signals S1 and S2 meets 1＜(A2/A1)≦(7/6), the response of different frequency bands outside the fundamental frequency can be reduced, especially even multiples. The effect of reducing the response is better in the frequency band. Figure 11 shows the Fourier series frequency component distribution diagram of the swing generated when the amplitude ratio of signals S1 and S2 is A2/A1 = 7/6. Figure 11 can clearly see the response of different frequency bands outside the fundamental frequency at this ratio. Significantly reduced, especially in the even-numbered frequency band, the response reduction effect is better, thus reducing the noise of the optical element operation and making the control of the swing angle more stable and precise.

The structure and operation mode of the actuator in each of the above embodiments are not limited at all, as long as it can provide the force to tilt and swing the optical element. In another embodiment, the carrier 110 may be made of magnetic material, for example, and the actuator may be an air-core coil or an electromagnet. When the coil or the electromagnet is energized, it can generate suction to attract the carrier, causing one end of the optical element 180 to move down. The pressure produces an oscillating motion. In another embodiment, as shown in FIG. 12 , a piezoelectric element 250 disposed on the bearing base 110 can also be used. By applying an electric field to the piezoelectric element 250, the piezoelectric element 250 can cause compression or tensile deformation. This means that the electrical energy can be converted into mechanical energy to make the optical element 180 swing back and forth to achieve the effect of adjusting the optical path.

FIG. 13 is a schematic diagram of an optical path adjustment mechanism applied to an optical system according to an embodiment of the present invention. Referring to FIG. 11 , the optical device 400 includes an illumination system 310 , a light valve module 320 , a projection lens 260 and an optical path adjustment mechanism 100 . Among them, the lighting system 310 has a light source 312, which is suitable for providing a light beam 314, and the light valve module 320 is arranged on the transmission path of the light beam 314. The light valve module 320 is adapted to convert the light beam 314 into a plurality of sub-images 314a. In addition, the projection lens 260 is disposed on the transmission path of these sub-images 314a, and the light valve module 320 is located between the lighting system 310 and the projection lens 260. In addition, the light path adjustment mechanism 100 may be disposed between the light valve module 320 and the projection lens 260 or within the projection lens 260, for example, between the light valve module 320 and the total internal reflection lens 319 or within the total internal reflection lens 319. Between the camera 319 and the projection lens 260, and located on the transmission path of these sub-images 314a. In the above-mentioned optical device 400, the light source 312 may include, for example, a red light-emitting diode 312R, a green light-emitting diode 312G, and a blue light-emitting diode 312B. The colored light emitted by each light-emitting diode passes through a light combining device 316. After the light is combined, a light beam 314 is formed, and the light beam 314 passes through a fly-eye lens array 317, an optical element group 318 and a total internal reflection prism (TIR Prism) 319 in sequence. Afterwards, the total internal reflection lens 319 will reflect the light beam 314 to the light valve module 320. At this time, the light valve module 320 will convert the light beam 314 into a plurality of sub-images 314a, and these sub-images 314a will pass through the total internal reflection lens 319 and the optical path adjustment mechanism 100 in sequence, and will be projected through the projection lens 260. Projected on screen 350. In this embodiment, when the sub-images 314a pass through the optical path adjustment mechanism 100, the optical path adjustment mechanism 100 changes the transmission paths of part of the sub-images 314a. That is to say, the sub-images 314a passing through the light path adjustment mechanism 100 will be projected at the first position (not shown) on the screen 350, and the sub-images 314a passing through the light path adjustment mechanism 100 will be projected during another part of the time. A second position (not shown) projected on the screen 350, wherein the first position and the second position are different from each other by a fixed distance in the horizontal direction or/and the vertical direction. In this embodiment, since the optical path adjustment mechanism 100 can move the imaging positions of the sub-images 314a by a fixed distance in the horizontal direction or/and the vertical direction, the horizontal resolution or/and the vertical resolution of the image can be improved. Of course, the above embodiments are only examples. The optical path adjustment mechanism of the embodiment of the present invention can be used in different optical systems to obtain different effects, and the location and configuration of the optical path adjustment mechanism in the optical system are not limited at all. For example, as shown in FIG. 14 , the optical path adjustment mechanism 100 can also be provided in the projection lens 260 of the optical device 410 .

The term light valve module has been widely used in the projection industry. In this industry, it is mostly used to refer to some independent optical units in a spatial light modulator (SLM). The so-called spatial light modulator contains many independent units (independent optical units), which are spatially arranged into a one-dimensional or two-dimensional array. Each unit can be independently controlled by optical signals or electrical signals, and use various physical effects (Pockels effect, Kerr effect, acousto-optic effect, magneto-optical effect, semiconductor self-electro-optical effect or photorefractive effect, etc.) to change itself The optical characteristics of the unit are used to modulate the illumination beams illuminating the plurality of independent units and output image beams. The independent units can be optical components such as micro-mirrors or liquid crystal cells. That is, the light valve module can be a Digital Micro-mirror Device (DMD), a silicon-based liquid crystal panel (liquid-crystal-on-silicon panel, LCOS Panel) or a transmissive LCD panel. [0039] A projector is a device that uses optical projection to project images onto a screen. In the projector industry, projectors are generally divided into cathode ray tubes (Cathode Ray Tubes) depending on the light valve modules used inside. ) type projectors, Liquid Crystal Display (LCD) type projectors, Digital Light Projector (DLP) and Liquid Crystal on Silicon (LCOS) projectors due to the light emitted when the projector is operating. The LCD panel is used as a light valve module, so it is a transmissive projector. Projectors using light valve modules such as LCOS and DLP rely on the principle of light reflection to develop images, so they are called reflective projectors. Although the present invention has been disclosed above in terms of preferred embodiments, they are not intended to limit the present invention. Anyone skilled in the art may make some modifications and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be subject to the scope of the patent application attached. In addition, any embodiment or patentable scope of the present invention does not necessarily achieve all the purposes, advantages or features disclosed in the present invention. In addition, the abstract section and title are only used to assist in searching patent documents and are not intended to limit the scope of the invention.

100: Optical path adjustment mechanism 110: Bearing seat 112:Inner frame 114:Outer frame 120: base 130:Magnet holder 140:Bracket 140a: Gap 140c:lug structure 140d:Open your mouth 142: First side 144:Second side 146:Third side 152: The first pair of flexible parts 154: The second pair of flexible parts 160, 170 actuator 160a, 160b, 170a, 170b: actuator part 162, 172: Coil 164, 174: Magnet 176: Coil seat 180:Optical components 180a:Lens 190: Fixtures 192: Lens holder 200:Optical system 210:Light valve module 210a: Surface 212: Glass protective cover 220:稜顡 310:Lighting system 312:Light source 312R, 312G, 312B: LED 314:Beam 314a: Sub-image 316: Light combining device 317:Fly Eye Lens Array 318:Optical component group 319: Total internal reflection 320:Light valve module 350:Screen 400, 410: Optical device A1, A2: Amplitude C: Projection point D1, D2: distance F: flat section L, M: position N: normal P:Focus Q:Endpoint S, S1, S2: drive signal P1: lowest potential interval P2: Pulse rise time P3: Highest potential range P4: Pulse falling time SV: lowest potential SP: highest potential X1, X2, X3: position Y1, Y2, Y3: position θ: angle

FIG. 1 is an exploded view of the optical path adjustment mechanism according to an embodiment of the present invention. FIG. 2 is a schematic plan view of the optical path adjustment mechanism in FIG. 1 after assembly. FIG. 3A is a schematic diagram showing the optical path adjustment mechanism in an optical system combined with other optical components according to an embodiment of the present invention, and FIG. 3B is a schematic diagram of an example of the configuration relationship between the light valve module and the optical path adjustment mechanism in FIG. 3A . 3C is a schematic diagram showing the optical path adjustment mechanism and other optical elements in an optical system according to another embodiment of the present invention. Figure 4 is a schematic diagram illustrating examples of different configuration positions of the actuator. FIG. 5 is a schematic diagram of a driving signal used by an actuator according to an embodiment of the present invention. FIG. 6 is a schematic diagram of different swing positions produced by driving the optical element using the driving signal of FIG. 5 . FIG. 7 shows a Fourier series frequency component distribution diagram of the swing generated by the driving signal of FIG. 5 . FIG. 8 shows the Fourier series frequency component distribution diagram of the swing generated by the driving signal having a sinusoidal changing section. Figure 9 shows a schematic diagram of a driving signal with a sinusoidal wave changing section. FIG. 10 is a schematic diagram of a driving signal used by an actuator according to another embodiment of the present invention. FIG. 11 shows the Fourier series frequency component distribution diagram of the swing generated by the driving signal of FIG. 10 . Figure 12 is a schematic diagram of an actuator according to another embodiment of the present invention. FIG. 13 is a schematic diagram of an optical path adjustment mechanism applied to an optical system according to an embodiment of the present invention. FIG. 14 is a schematic diagram of an optical path adjustment mechanism applied to an optical system according to another embodiment of the present invention.

F: flat section

S: drive signal

P1: lowest potential interval

P2: Pulse rise time

P3: Highest potential range

P4: Pulse falling time

SV: lowest potential

SP: highest potential

Claims (10)

An optical path adjustment mechanism includes: a bearing base; An optical element is provided on the carrier; and a first actuator, used to actuate the optical element with a first axis as the axis, and the first actuator can receive a first drive signal; And the first driving signal complies with the following characteristics: the first driving signal only includes a pulse rising section and a pulse falling section in one cycle; the first driving signal has a voltage value that increases during the pulse rising section. It will no longer decrease, and during the falling period of the pulse, the voltage value will not increase after decreasing. An optical path adjustment mechanism includes: a bearing base; An optical element is provided on the carrier; and A first actuator is used to actuate the optical element with a first axis as the axis. The first actuator can receive a first drive signal. The first drive signal only includes a There is a pulse rising section and a pulse falling section; and during the pulse rising section, the relative curve change of the voltage value of the first driving signal with time only has a section in which the slope is substantially greater than or equal to zero. During the falling period of the pulse of the first driving signal, the relative curve change of the voltage value of the first driving signal with time only has a section where the slope is substantially less than or equal to zero. The optical path adjustment mechanism as described in claim 1 or 2, wherein the pulse rise time of the period is between 0.8-1.0ms. The optical path adjustment mechanism as described in claim 1 or 2, wherein the length of the pulse falling time of the period is between 0.8-1.0ms. The optical path adjustment mechanism as claimed in claim 1 or 2, wherein the first actuator enables the optical element to change between a first swing position and a second swing position. The optical path adjustment mechanism as described in claim 1 or 2 further includes: A second actuator is used to actuate the optical element with a second axis as its axis, and the second actuator can receive a second driving signal. The optical path adjustment mechanism as described in claim 6, wherein the second driving signal only includes a pulse rising section and a pulse falling section in a cycle, and the voltage value of the second driving signal during the pulse rising section is It does not decrease after increasing, and the voltage value of the second driving signal decreases and then does not increase during the falling period of the pulse. The optical path adjustment mechanism as described in claim 6, wherein the second driving signal only includes a pulse rising section and a pulse falling section in a cycle, and the second driving signal during the pulse rising section, the third driving signal The relative curve change of the voltage value of the second drive signal and time only has a section where the slope is substantially greater than or equal to zero. The relative curve of the voltage value of the second drive signal and time during the pulse falling period of the second drive signal. changes, only segments with slopes substantially less than or equal to zero. The optical path adjustment mechanism described in item 6 of the patent application further includes: A first pair of flexible members is provided on the bearing base and constitutes the first axis; and A second pair of flexible members is provided between the bearing seat and the bracket and constitutes the second axis. The optical path adjustment mechanism as described in item 6 of the patent application, wherein the first driving signal has a first amplitude, the second driving signal has a second amplitude, the second amplitude is greater than the first amplitude, and the third The ratio of the second amplitude to the first amplitude is equal to or less than 7/6.

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