TWI754955B - Light path adjustment mechanism and fabrication method thereof - Google Patents

Abstract

A light path adjustment mechanism includes a base, a frame, a carrier, a first coil, a second coil and a magnet. The frame is connected to the base by a first pair of flexible members, and the carrier is provided in the frame and connected to the frame by a second pair of flexible members. The magnet has a first side and a second side, the first coil is located on the first side, and the second coil is located on the second side.

Description

Optical path adjustment mechanism and manufacturing method thereof

The present invention relates to an optical path adjustment mechanism and a manufacturing method thereof.

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 traveling optical path of the light in the device, so as to provide various effects such as improving the imaging resolution and improving the picture quality. However, the number of components, weight, and volume of the conventional optical path adjustment mechanism are relatively large, and further miniaturization is difficult. Therefore, there is an urgent need for a design of an optical path adjustment mechanism with a simple structure, high reliability, and a significant reduction in weight and volume.

The "prior art" paragraph is only used to help understand the present disclosure, so the content disclosed in the "prior art" paragraph may contain some that do not constitute the prior art known to those with ordinary skill in the art. The content disclosed in the "Prior Art" paragraph does not represent the content or the problem to be solved by one or more embodiments of the present invention, and has been known or recognized by those with ordinary knowledge in the technical field before the application of the present invention.

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-mentioned and other objects, features and advantages of the present invention more obvious and easy to understand, the following specific embodiments are given in conjunction with the accompanying drawings, and are described in detail as follows.

According to an aspect of the present invention, an optical path adjustment mechanism is provided, including a base, a frame, a bearing seat, a first coil, a second coil and a magnet. frame by a first pair The flexible piece is connected with the base, the bearing seat is arranged in the frame and is connected with the frame through a second pair of flexible pieces, the first coil is arranged on the frame, and the second coil is arranged on the bearing seat. The magnet has a first side and a second side, the first coil is located on the first side and the shortest distance from the first side is d1, the second coil is located on the second side and the shortest distance from the second side is d2, and the optical path adjustment mechanism The condition of 1<d1/d2<2 is satisfied.

According to an aspect of the present invention, an optical path adjustment mechanism is provided, including a base, a frame, a bearing seat, a first coil, a second coil and a magnet. The frame is connected with the base through the first transmission mechanism, the bearing seat is arranged in the frame and is connected with the frame through the second transmission mechanism, the first coil is arranged on the frame, and the second coil is arranged on the bearing seat. The magnet has a first side, the first coil and the second coil are both located on the first side, and the shortest distance from the first side of the magnet to the bearing seat is greater than the height of the second coil relative to the bearing seat.

According to the above aspect of the present invention, since the actuator for swinging the optical element in two different axial directions only needs to use one magnet, the number of components of the actuator and the required layout space can be reduced, and the complexity of the optical path adjustment mechanism can be reduced. Overall weight, volume and manufacturing cost.

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-mentioned and other objects, features and advantages of the present invention more obvious and easy to understand, the following specific embodiments are given in conjunction with the accompanying drawings, and are described in detail as follows.

100, 200: Optical path adjustment mechanism

110: Bearing seat

120: Frame

130: Pedestal

152: The first pair of flexible parts

154: Second pair of flexible parts

162: Magnet

162a: First side

162b: Second side

162c: Bottom side

164: First Coil

166: Second coil

172: Magnet holder

180: Optical Components

260: Projection Lens

310: Lighting Systems

312: light source

312R, 312G, 312B: Light Emitting Diodes

314: Beam

314a: Subimage

316: Light Combining Device

317: Fly's Eye Lens Array

318: Lens group

319: Internal Total Reflection

320: Digital Micromirror Device

350: Screen

400, 410: Optical Devices

d1, d2, D: distance

H: height

N, S: magnetic pole

P, Q: axis

1A is a three-dimensional schematic diagram of an optical path adjustment mechanism according to an embodiment of the present invention, FIG. 1B is a schematic plan view of the optical path adjustment mechanism of FIG. 1A , and FIG. 1C is a schematic diagram illustrating a force actuation direction of a coil of the optical path adjustment mechanism.

FIG. 2 is a three-dimensional schematic diagram of an optical path adjusting mechanism according to another embodiment of the present invention.

3A is a schematic three-dimensional view of the optical path adjustment mechanism of FIG. 2 from another viewing angle, and FIG. 3B is a schematic plan view of FIG. 3A .

FIG. 4 is an embodiment of the optical path adjustment mechanism of the present invention applied to an optical system schematic diagram.

FIG. 5 is a schematic diagram of an optical path adjustment mechanism applied to an optical system according to another embodiment of the present invention.

The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the embodiments with reference to the drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or rear, etc., are only for referring to the directions of the attached drawings. Accordingly, the directional terms used are illustrative and not limiting of the present invention.

The disclosure in the following embodiments discloses an optical path adjustment mechanism, which can be applied to different optical systems (such as display devices, projection devices, etc.) to adjust or change the optical path to provide, for example, improving imaging resolution, improving image quality (eliminating dark spots, etc.). The effects of the optical path adjustment mechanism in the optical system are not limited at all.

1A is a schematic perspective view of an optical path adjustment mechanism according to an embodiment of the present invention, and FIG. 1B is a schematic plan view of the optical path adjustment mechanism of FIG. 1A . Please refer to FIG. 1A and FIG. 1B at the same time, the optical path adjustment mechanism 100 may include a carrier 110 , a frame 120 , a base 130 , a first pair of flexible members 152 and a second pair of flexible members 154 . In this embodiment, the frame 120 is adjacent to the base 130 and substantially surrounds the bearing base 110 . The first pair of flexible members 152 are connected to the base 130 and the frame 120 and define a first direction (the extending direction of the first axis P). The two pairs of flexible members 154 are connected to the bearing base 110 and the frame 120 and define a second direction (the extending direction of the second axis Q), and the first direction is different from the second direction. For example, the first direction may be vertical as shown in FIG. 1A The second direction is not limited. In this embodiment, the bearing base 110 , the frame 120 , the first pair of flexible members 152 and the second pair of flexible members 154 may be located at substantially the same level and may be formed of the same sheet-like elastic member, but this The invention is not limited to this. Again, light The path adjustment mechanism 100 may include an optical element 180. The optical element 180 may be disposed on the bearing base 110 and may be, for example, a lens. The lens only needs to provide the effect of deflecting light. The form and type of the lens are not limited. It is a Lens or a Mirror. Furthermore, the optical path adjustment mechanism 100 further includes a magnet 162 , a first coil 164 , and a second coil 166 . In this embodiment, the first coil 164 is disposed on the frame 120 , and the second coil 166 is disposed on the bearing base 110 . , the magnet 162 can be fixed on a magnet base 172 , and the magnet base 172 can be fixed on the base 130 . 1A, the magnet 162 can generate a fixed magnetic field. When the first coil 164 is energized, the current of the first coil 164 generates a magnetic field and interacts with the fixed magnetic field of the magnet 162, so that the coil 164 can be moved by force. The relationship between the direction of force on the wire of the coil, the direction of the magnetic field of the magnet, and the direction of the current of the coil can be determined by the right-hand open palm rule with reference to FIG. 1C . Taking the first coil 164 as an example in FIG. 1C , use the right hand to point the thumb toward the current direction of the coil 164 , and then point the other four fingers toward the magnetic field direction of the magnet 162 . The facing direction is the force direction of the wire of the coil 164 . Therefore, since the first coil 164 is connected to the frame 120 , the first coil 164 can move together with one side of the frame 120 when the first coil 164 is energized and subjected to force, so that the frame 120 and the optical elements 180 on it are formed by the first pair of flexible members 152 . An axis P is the reciprocating swing of the axis. Similarly, because the second coil 166 is connected to the bearing base 110, the second coil 166 can move together with one side of the bearing base 110 when the second coil 166 is energized and subjected to force, so that the bearing base 110 and the optical element 180 on it are formed by the second pair of flexible parts. The second axis Q formed by 154 is the reciprocating swing of the shaft center. Furthermore, because the first pair of flexible members 152 and the second pair of flexible members 154 can act as the rotating shafts to transmit the power for swinging the optical element 180 , the first pair of flexible members 152 and the second pair of flexible members 154 can also be used separately. regarded as a transmission mechanism. As shown in FIG. 1B , the first pair of flexible members 152 connected between the base 130 and the frame 120 may be, for example, parallel to the X-axis direction, and the second pair of flexible members 154 connected between the bearing base 110 and the frame 120 For example, the frame 120 and the optical element 180 can be oscillated in parallel with the Y-axis direction, and the first pair of flexible members 152 (the X-axis direction) can be pivoted back and forth. In addition, the bearing base 110 together with the optical element 180 can swing back and forth with the second pair of flexible members 154 (the Y-axis direction) as the axis. Therefore, the optical element 180 can generate two swing angle ranges in different axial directions, and swing back and forth or rotate to different positions to deflect the incident light to different directions, so as to obtain the effect of adjusting or changing the optical path of the light. For example, the optical element 180 can be rapidly swung in two different axes to generate four different inclined positions relative to the base 130 . Therefore, the one-pixel image originally incident on the optical element 180 is rapidly moved at the four different inclined positions. After the transformed optical element 180 is deflected, four pixel images can be generated, and the effect of increasing the pixel resolution to 4 times is obtained. The optical path adjustment mechanism in the embodiment of the present invention can adjust or change the optical path to produce different effects according to actual needs, such as improving projection resolution, improving image quality (eliminating dark areas, softening image edges), etc. without limitation. Referring to FIG. 1B again, in this embodiment, the magnet 162 has a first side 162a and a second side 162b, the first coil 164 is located on the first side 162a and the shortest distance from the first side is d1, and the second coil 166 is located on the first side 162a. The shortest distance between the second side 162b and the second side is d2, and the optical path adjustment mechanism 100 of this embodiment can satisfy the condition of 1<d1/d2<2, but the present invention is not limited thereto.

With the design of the above-mentioned embodiment, only one magnet is required for the actuator for swinging the optical element in two different axes, so the number of components of the actuator and the required layout space can be reduced, and the optical path adjustment mechanism can be reduced. overall weight, volume and manufacturing cost.

It should be noted that the component distribution, structure and operation mode of the actuator in the above-mentioned embodiments are not limited at all, and it only needs to be able to provide a force for tilting and swinging the optical element. FIG. 2 is a schematic diagram of an optical path adjustment mechanism according to another embodiment of the present invention, wherein FIG. 2 clearly shows the cross-sectional structure of the actuator. As shown in FIG. 2 , the first pair of flexible members 152 of the optical path adjustment mechanism 200 is connected to the base 130 and the frame 120 , the second pair of flexible members 154 is connected to the bearing base 110 and the frame 120 , the first coil 164 is arranged on the frame 120 , The second coil 166 is disposed on the carrier 110 , and the first coil 164 and the second coil 166 are disposed on the same side of the single magnet 162 (as illustrated as the bottom side 162 c ). As shown in FIG. 2, for example, the bottom side 162c of the magnet 162 For example, it can be an S pole. When the first coil 164 is energized, an N pole can be formed on the top side by the electromagnetic effect. Therefore, the magnet 162 can attract the first coil 164, so that the first coil 164 and the frame 120 form the first pair of flexible members 152. In order to swing the rotating shaft, similarly, when the second coil 166 is energized, an N pole can be formed on the top side through the electromagnetic effect, so the magnet 162 can attract the second coil 166, so that the second coil 166 and the bearing base 110 can form a second pair of flexible members. 154 is the swing of the rotating shaft. It should be noted that the above-mentioned magnetic pole representation and actuating method using magnetic attraction force are only examples, and magnetic repulsion force, or alternatively using magnetic attraction force and magnetic repulsion force for actuation may be used. In this embodiment, the first coil 164 and the second coil 166 are both disposed on the bottom side 162c of the single magnet 162 , and the shortest distance D from the bottom side 162c of the magnet 162 to the bearing base 110 is greater than that of the second coil 166 relative to the bearing base 110 height H. 3A is a schematic three-dimensional view of the optical path adjustment mechanism of FIG. 2 from another viewing angle, and FIG. 3B is a schematic plan view of FIG. 3A . FIG. 3A clearly shows the single magnet 162 housed in the magnet base 172 and the complete configuration of the single magnet 162 relative to the coils 164 and 166 , and FIG. 3B clearly shows the magnet 162 and the first pair of flexible members 152 and the second pair of flexible members 154. The relative arrangement relationship between the bearing seat 110 and the frame 120 on a plane.

The components of the optical path adjustment mechanism in the above embodiments are only examples, and other components with the same or similar functions can also be used instead. For example, for example, the frame 120 can be replaced by an outer frame, the base 130 can be replaced by a base, etc. without limitation. In one embodiment, the carrier 110 , the base 130 , the frame 120 , 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 the components may be integrally formed. It can be integrally formed first and then combined with other components.

According to the designs of the above-mentioned embodiments, a method for manufacturing an optical path adjustment mechanism can be provided. For example, a base, a frame and a bearing seat are provided first, and an optical element is arranged on the bearing seat. Furthermore, a first pair of flexible parts is arranged to connect the base and the frame, a second pair of flexible parts to connect the frame and the bearing seat is arranged, a first coil is arranged on the frame, and a second coil is arranged on the bearing seat, And a magnet is arranged on the base. The magnet has a first side and a On the second side, the first coil is located on the first side and the shortest distance from the first side is d1, the second coil is located on the second side and the shortest distance from the second side is d2, and the configuration is such that 1<d1/d2<2 .

4 is a schematic diagram of an optical path adjustment mechanism applied to an optical device according to an embodiment of the present invention. Referring to FIG. 4 , 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 . The lighting system 310 has a light source 312 suitable for providing a light beam 314 , and the light valve module 320 is disposed 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 the sub-images 314 a, and the light valve module 320 is located between the illumination system 310 and the projection lens 260 . In addition, the optical path adjustment mechanism 100 can be disposed between the light valve module 320 and the projection lens 260 or in the projection lens 260 , for example, between the light valve module 320 and the total internal reflection lens 319 or in the total internal reflection Between the lens 319 and the projection lens 260, and 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 color 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 (TIR Prism) 319 in sequence. After that, the total internal reflection lamp 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 sequentially pass through the total internal reflection lamp 319 and the optical path adjustment mechanism 100, and the projection lens 260 will convert these sub-images 314a Projected on the screen 350 . In this embodiment, when the sub-images 314a pass through the optical path adjustment mechanism 100, the optical path adjustment mechanism 100 will change the transmission paths of some of the sub-images 314a. That is to say, the sub-images 314a passing through the optical path adjustment mechanism 100 will be projected on the first position (not shown) on the screen 350, and the sub-images 314a passing through the optical path adjustment mechanism 100 will be projected in another part of the time. Projected on the screen 350 second A setting (not shown), wherein the first position and the second position differ 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 and/or the vertical resolution of the images can be improved. Of course, the above embodiments are only examples, the optical path adjustment mechanism of the embodiments of the present invention can be applied to 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. 5 , the optical path adjustment mechanism 100 may also be provided in the projection lens 260 of the optical device 410 .

The term light valve module (Light valve) has been widely used in the projection industry. In this industry, it can mostly be 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) that are spatially arranged in 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-optic effect, self-electro-optic effect of semiconductor or photorefractive effect, etc.) to change itself The optical characteristics of the illuminating light beams are modulated in the plurality of independent units, and the image light beams are output. The individual cells can be optical elements such as micromirrors or liquid crystal cells. That is, the light valve module may be a digital micro-mirror device (DMD), a liquid-crystal-on-silicon panel (LCOS Panel), or a transmissive liquid crystal panel.

A projector is a device that uses optical projection to project an image onto a screen. In the projector industry, projectors are generally classified into cathode ray tube (Cathode Ray Tube) projections according to the different light valve modules used inside. projectors, Liquid Crystal Display (LCD) projectors, Digital Light Projectors (DLP) and Liquid Crystal on Silicon (LCOS) projectors During operation, the light will pass through the LCD panel as a light valve module, so it is a transmissive projector, while a projector using a light valve module such as LCOS and DLP is based on the principle of light reflection, so it is called a reflective type. Projector.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be determined by the scope of the appended patent application. In addition, any embodiment of the present invention or the scope of the claims is not required to achieve all of the objects or advantages or features disclosed herein. In addition, the abstract section and the title are only used to assist the search of patent documents and are not intended to limit the scope of the present invention.

100: Optical path adjustment mechanism

110: Bearing seat

120: Frame

130: Pedestal

152: The first pair of flexible parts

154: Second pair of flexible parts

162: Magnet

164: First Coil

166: Second coil

172: Magnet holder

180: Optical Components

P, Q: axis

Claims (10)

An optical path adjustment mechanism, comprising: a base; a frame connected to the base by a first pair of flexible parts; a bearing seat, arranged in the frame, connected with the frame by a second pair of flexible parts; a first coil, arranged on the frame; a second coil disposed on the bearing seat; and A magnet has a first side and a second side, the first coil is located on the first side and the shortest distance from the first side is d1, the second coil is located on the second side and the second side The shortest distance is d2, and the optical path adjustment mechanism satisfies the condition of 1<d1/d2<2. An optical path adjustment mechanism, comprising: a base; a frame connected to the base by a first transmission mechanism; a bearing seat, arranged in the frame, connected with the frame by a second transmission mechanism; a first coil, arranged on the frame; a second coil disposed on the bearing seat; and A magnet has a first side, the first coil and the second coil are both located on the first side, and the shortest distance from the first side of the magnet to the bearing seat is greater than the distance between the second coil and the bearing seat high. The optical path adjustment mechanism as described in item 1 or 2 of the scope of the patent application further includes: An optical element is arranged on the carrier. The optical path adjustment mechanism according to claim 3, wherein the optical element is a lens or a reflector. The optical path adjustment mechanism as described in claim 1 or 2, wherein the optical path adjustment mechanism satisfies one of the following conditions: (1) The total number of magnets of the optical path adjustment mechanism is 1; (2) The magnet of the optical path adjustment mechanism is fixed to a magnet base, and the magnet base is fixed to the base. The optical path adjustment mechanism as described in claim 1 or 2, wherein the frame substantially surrounds the bearing base. The optical path adjustment mechanism as described in claim 2, wherein the first pair of transmission parts is a first pair of flexible parts, the second pair of transmission parts is a second pair of flexible parts, and the The first pair of flexible members defines a first direction, and the second pair of flexible members defines a second direction. The optical path adjusting mechanism according to claim 7, wherein at least two of the frame, the bearing base, the first pair of flexible members, and the second pair of flexible members are integrally formed. The optical path adjusting mechanism described in item 7 of the claimed scope further comprises an optical element disposed on the carrier, and the optical element swings around the first direction and the second direction as axes. A manufacturing method of an optical path adjustment mechanism, comprising: A base, a frame and a bearing seat are provided, and an optical element is arranged on the bearing seat; A first pair of flexible parts are arranged to connect the base and the frame; A second pair of flexible parts are arranged to connect the frame and the bearing seat; a first coil is arranged on the frame; disposing a second coil on the carrier; and A magnet is arranged on the base, the magnet has a first side and a second side, wherein the first coil is located on the first side and the shortest distance from the first side is d1, and the second coil is located on the first side The second side and the shortest distance from the second side is d2, and the configuration is such that 1<d1/d2<2.

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