CN113835183A

CN113835183A - Optical path adjusting mechanism and manufacturing method thereof

Info

Publication number: CN113835183A
Application number: CN202010575486.7A
Authority: CN
Inventors: 张语宸; 程冠伦; 林维赐
Original assignee: Young Optics Inc
Current assignee: Young Optics Inc
Priority date: 2020-06-22
Filing date: 2020-06-22
Publication date: 2021-12-24

Abstract

An optical path adjusting mechanism comprises a base, a frame, a bearing seat, a first coil, a second coil and a magnet. The frame is connected with the base by a first pair of flexible pieces, and the bearing seat is arranged in the frame and is connected with the frame by a second pair of flexible pieces. The magnet has a first side and a second side, the first coil is located at the first side and the second coil is located at the second side. The invention also provides a manufacturing method of the optical path adjusting mechanism.

Description

Optical path adjusting mechanism and manufacturing method thereof

Technical Field

The present invention relates to an optical path adjusting mechanism and a method of manufacturing the same.

Background

In recent years, various image display technologies have been widely used in daily life. In an image display device, for example, an optical path adjusting mechanism may be disposed to change the traveling optical path of light in the device, so as to provide various effects, such as improving the imaging resolution and improving the image quality. However, the conventional optical path adjusting mechanism has a large number of components, weight and volume, and is difficult to be further miniaturized. Therefore, there is a need for an optical path adjusting mechanism with simple structure, high reliability and greatly reduced weight and volume.

The background section is only used to help understanding the technical solution of the present invention, and therefore the technical solution disclosed in the background section may include some prior art which does not constitute the knowledge of those skilled in the art. The technical solutions disclosed in the "background" section do not represent the technical solutions or problems to be solved by one or more embodiments of the present invention, which are known or recognized by those skilled in the art before the present application.

Disclosure of Invention

Other objects and advantages of the present invention will be further understood from the technical features disclosed in the present invention. In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

According to an aspect of the present invention, there is provided an optical path adjusting mechanism including a base, a frame, a holder, a first coil, a second coil, and a magnet. The frame is connected with the base by a first pair of flexible pieces, the bearing seat is arranged in the frame and is connected with the frame by 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 is provided with a first side and a second side, the first coil is positioned on the first side, the shortest distance between the first side and the first side is d1, the second coil is positioned on the second side, the shortest distance between the second side and the second side is d2, and the optical path adjusting mechanism meets the condition that 1< d1/d2< 2.

According to an aspect of the present invention, there is provided an optical path adjusting mechanism including a base, a frame, a holder, a first coil, a second coil, and a magnet. The frame is connected with the base by the first transmission part, the bearing seat is arranged in the frame and is connected with the frame by the second transmission part, the first coil is arranged on the frame, and the second coil is arranged on the bearing seat. The magnet is provided with a first side, the first coil and the second coil are both positioned 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 an aspect of the present invention, there is provided a method of manufacturing an optical path adjustment mechanism, including the following steps. A base, a frame and a carrying seat are provided, and an optical element is arranged on the carrying seat. A first pair of flexible members is provided to connect the base and the frame. A second pair of flexible members is disposed to connect the frame and the supporting base. A first coil is disposed on the frame. And a second coil is arranged on the bearing seat. A magnet is arranged on the base and provided with a first side and a second side, wherein the first coil is positioned on the first side and has the shortest distance d1 with the first side, the second coil is positioned on the second side and has the shortest distance d2 with the second side, and the arrangement is that 1< d1/d2< 2.

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

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

Fig. 1A is a schematic perspective view of an optical path adjusting 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.

Fig. 1C is a schematic diagram illustrating the force-actuated direction of the coil of the optical path adjustment mechanism.

Fig. 2 is a schematic perspective view of an optical path adjusting mechanism according to another embodiment of the present invention.

Fig. 3A is a schematic perspective view of the optical path adjusting mechanism of fig. 2 at another viewing angle.

Fig. 3B is a schematic plan view of fig. 3A.

Fig. 4 is a schematic view illustrating an optical path adjusting mechanism applied to an optical system according to an embodiment of the present invention.

Fig. 5 is a schematic view illustrating an optical path adjusting mechanism applied to an optical system according to another embodiment of the present invention.

Detailed Description

The foregoing and other technical and scientific aspects, features and advantages of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are referred to only in the direction of the attached drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.

The disclosure in the following embodiments discloses an optical path adjusting mechanism that can be applied to different optical systems (e.g., display devices, projection devices, etc.) to adjust or change the optical path to provide effects such as improving the imaging resolution, improving the image quality (eliminating dark areas, softening image edges), etc., without limitation, and the arrangement position and arrangement manner of the optical path adjusting mechanism in the optical system are not limited at all.

Fig. 1A is a schematic perspective view of an optical path adjusting mechanism according to an embodiment of the present invention, and fig. 1B is a schematic plan view of the optical path adjusting mechanism shown in fig. 1A. Referring to fig. 1A and fig. 1B, the optical path adjusting mechanism 100 may include a supporting base 110, a frame 120, a base 130, a first pair of flexible members 152, and a second pair of flexible members 154. In the embodiment, the frame 120 is adjacent to the base 130 and substantially surrounds the carrying seat 110, the first pair of flexible members 152 connects the base 130 and the frame 120 and defines a first direction (extending direction of the first axis P), the second pair of flexible members 154 connects the carrying seat 110 and the frame 120 and defines a second direction (extending direction of the second axis Q), and the first direction is different from the second direction, for example, the first direction may be perpendicular to the second direction as shown in fig. 1A but is not limited. In the embodiment, the supporting 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 horizontal height and may be formed of, for example, the same sheet-shaped elastic member, but the invention is not limited thereto. Furthermore, the optical path adjusting mechanism 100 may include an optical element 180, and the optical element 180 may be disposed on the supporting base 110 and may be, for example, a Lens, which only provides the effect of deflecting light, and the form and type of the Lens are not limited, and may be, for example, a Lens (Lens) or a Mirror (Mirror). Furthermore, the optical path adjusting mechanism 100 further includes a magnet 162, a first coil 164, and a second coil 166, in the embodiment, the first coil 164 is disposed on the frame 120, the second coil 166 is disposed on the supporting 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. Referring to fig. 1A again, the magnet 162 may generate a fixed magnetic field, and when the first coil 164 is powered on, 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 may be forced to move. The relationship between the direction of the wire force on the coil, the direction of the magnetic field on the magnet, and the direction of the current in the coil can be determined by the right-hand rule with reference to fig. 1C. As shown in fig. 1C, taking the first coil 164 as an example, the thumb is pointed towards the current direction of the coil 164 by the right hand, and the other four fingers are pointed towards the magnetic field direction of the magnet 162, so that the palm facing direction is the force-receiving direction of the wire of the coil 164 according to the rule of the palm of the right hand. Therefore, since the first coil 164 is connected to the frame 120, the first coil 164 can move along with one side of the frame 120 when being energized and stressed, so that the frame 120 and the optical element 180 thereon can swing back and forth with the first axis P formed by the first pair of flexible members 152 as an axis. Similarly, since the second coil 166 is connected to the carrying base 110, the second coil 166 can move along with one side of the carrying base 110 when being energized and stressed, so that the carrying base 110 and the optical element 180 thereon can swing back and forth with the second axis Q formed by the second pair of flexible members 154 as an axis. Furthermore, since the first pair of flexible members 152 and the second pair of flexible members 154 can be used as a rotating shaft 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 regarded as a transmission member respectively. As shown in fig. 1B, the first pair of flexible members 152 connected between the base 130 and the frame 120 may be parallel to the X-axis direction, for example, and the second pair of flexible members 154 connected between the carrying base 110 and the frame 120 may be parallel to the Y-axis direction, for example, the frame 120 and the optical element 180 may swing back and forth by taking the first pair of flexible members 152 (X-axis direction) as an axis, and the carrying base 110 and the optical element 180 may swing back and forth by taking the second pair of flexible members 154 (Y-axis direction) as an axis. Therefore, the optical element 180 can generate two oscillating angle ranges in different axial directions, and oscillate or rotate to different positions in a reciprocating manner to deflect the incident light to different directions, so as to obtain the effect of adjusting or changing the light path of the light. For example, the optical element 180 can rapidly swing in two different axial directions to generate four different tilted positions relative to the base 130, so that a pixel image originally incident on the optical element 180 can be deflected by the optical element 180 rapidly transformed in the four different tilted positions to generate four pixel images, thereby obtaining an effect of increasing the pixel resolution by 4 times. The optical path adjusting mechanism of the embodiment of the invention adjusts or changes the optical path, and different effects can be generated according to actual requirements, such as increasing the projection resolution, improving the image quality (eliminating dark areas, softening image edges), and the like without limitation. Referring to fig. 1B again, in the present 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 has a shortest distance d1 from the first side, the second coil 166 is located on the second side 162B and has a shortest distance d2 from the second side, and the optical path adjusting mechanism 100 of the present embodiment can satisfy the condition of 1< d1/d2<2, but the present invention is not limited thereto.

With the design of the above embodiment, only one magnet is needed for the actuator that swings the optical element in two different axial directions, so the number of components of the actuator and the required layout space can be reduced, and the overall weight, volume and manufacturing cost of the optical path adjusting mechanism can be reduced.

It should be noted that the distribution, structure and operation of the components of the actuator of the above embodiments are not limited at all, and only the force for tilting and swinging the optical element needs to be provided. Fig. 2 is a schematic diagram of an optical path adjusting mechanism according to another embodiment of the present invention, wherein fig. 2 clearly illustrates a cross-sectional structure of an actuator. As shown in fig. 2, the first pair of flexible members 152 of the optical path adjusting mechanism 200 is connected to the base 130 and the frame 120, the second pair of flexible members 154 is connected to the carrier 110 and the frame 120, the first coil 164 is disposed 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 both disposed on the same side (the bottom side 162c is illustrated) of the single magnet 162. As shown in fig. 2, for example, the bottom side 162c of the magnet 162 may be an S-pole, and the first coil 164 may form an N-pole on the top side by an electromagnetic effect when the first coil 164 is energized, so that the magnet 162 can attract the first coil 164, so that the first coil 164 and the frame 120 can swing around the first pair of flexible members 152 as a rotating shaft, and similarly, the second coil 166 may form an N-pole on the top side by an electromagnetic effect when the second coil 166 is energized, so that the magnet 162 can attract the second coil 166, so that the second coil 166 and the carrier base 110 can swing around the second pair of flexible members 154 as a rotating shaft. It should be noted that the above-mentioned magnetic pole representation and actuation by magnetic attraction are only examples, and may be actuated by magnetic repulsion or by magnetic attraction and magnetic repulsion alternately. In the 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 between the bottom side 162c of the magnet 162 and the susceptor 110 is greater than the height H of the second coil 166 relative to the susceptor 110. Fig. 3A is a perspective view of the optical path adjusting mechanism of fig. 2 from another viewing angle, and fig. 3B is a plan view of fig. 3A. Fig. 3A clearly shows that the single magnet 162 is accommodated in the magnet seat 172 and the single magnet 162 is completely disposed relative to the

coils

164 and 166, and fig. 3B clearly shows the relative disposition relationship of the magnet 162, the first pair of flexible members 152, the second pair of flexible members 154, the carrier seat 110 and the frame 120 on the plane.

The components of the optical path adjusting mechanism in each of the above embodiments are merely examples, and other components having the same or similar functions may be substituted. For example, the frame 120 may be replaced by an external frame, the base 130 may be replaced by a base, and the like without limitation. In one embodiment, the supporting base 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 by using the same material, or two or more of them may be integrally formed and then combined with the other components.

According to the design of the above embodiments, a method for manufacturing an optical path adjusting mechanism is provided, for example, a base, a frame and a carrying base are provided, and an optical element is disposed on the carrying base. Furthermore, a first pair of flexible parts is arranged to connect the base and the frame, a second pair of flexible parts is arranged to connect the frame and the carrying seat, the first coil is arranged on the frame, the second coil is arranged on the carrying seat, and a magnet is arranged on the base. The magnet has a first side and a second side, the first coil is located on the first side and has a shortest distance d1 from the first side, the second coil is located on the second side and has a shortest distance d2 from the second side, and the shortest distance is configured such that 1< d1/d2< 2.

Fig. 4 is a schematic view illustrating an optical path adjusting mechanism applied to an optical device according to an embodiment of the present invention. Referring to fig. 4, the optical apparatus 400 includes an illumination system 310, a light valve module 320, a projection lens 260, and an optical path adjusting mechanism 100. The illumination system 310 has a light source 312 adapted to provide a light beam 314, and a light valve module 320 disposed on a 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 314 a. In addition, the projection lens 260 is disposed on the transmission path of the sub-images 314a, and the light valve module 320 is located between the illumination system 310 and the projection lens 260. In addition, the optical path adjusting 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 tir prism 319 or between the tir prism 319 and the projection lens 260, and located on the transmission path of the sub-images 314 a. 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 lights emitted by the light emitting diodes are combined by a light combining device 316 to form a light beam 314, and the light beam 314 sequentially passes through a fly-eye lens array (fly-eye lens array)317, an optical element group 318, and a Total Internal Reflection Prism (TIR Prism) 319. The tir prism 319 then reflects the beam 314 to the light valve module 320. At this time, the light valve module 320 converts the light beam 314 into a plurality of sub-images 314a, and the sub-images 314a sequentially pass through the tir prism 319 and the optical path adjusting mechanism 100, and are projected onto the screen 350 through the projection lens 260. In the present embodiment, when the sub-images 314a pass through the optical path adjusting mechanism 100, the optical path adjusting mechanism 100 changes the transmission paths of part of the sub-images 314 a. That is, the sub-images 314a passing through the optical path adjusting mechanism 100 are projected onto a first position (not shown) on the screen 350, and the sub-images 314a passing through the optical path adjusting mechanism 100 are projected onto a second position (not shown) on the screen 350 within another part of the time, wherein the first position and the second position are different by a fixed distance in the horizontal direction or/and the vertical direction. In the present embodiment, since the optical path adjusting 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 adjusting mechanism of the embodiments of the present invention can be applied to different optical systems to obtain different effects, and the arrangement position and the configuration manner of the optical path adjusting mechanism in the optical system are not limited at all. For example, as shown in fig. 5, the optical path adjustment mechanism 100 may be provided in the projection lens 260 of the optical device 410.

The term Light valve (SLM) is widely used in the projection industry, and most of the SLM is used to refer to a plurality of independent optical units in a Spatial Light Modulator (SLM). So-called spatial light modulators contain a number of individual cells (individual optical cells) which are spatially arranged in a one-or two-dimensional array. Each unit can be independently controlled by optical signals or electric signals, and various physical effects (such as Pockels effect, Kerr effect, acousto-optic effect, magneto-optic effect, electro-optic effect of semiconductor, or photorefractive effect) are utilized to change the optical characteristics of the unit, so that the illumination light beams illuminating the independent units are modulated, and image light beams are output. The independent unit can be an optical element such as a micro-mirror or a liquid crystal unit. That is, the light valve module may be a Digital Micro-mirror Device (DMD), a Liquid Crystal On Silicon (LCOS) Panel, or a transmissive liquid crystal Panel.

Projectors are devices that project images onto a screen by an optical projection method, and in the Projector industry, generally, projectors are classified into Cathode Ray Tube (Cathode Ray Tube) projectors, Liquid Crystal Display (LCD) projectors, Digital Light Projectors (DLP), and Liquid Crystal On Silicon (LCOS) projectors according to the difference in Light valve modules used therein. The projector using the light valve module such as Liquid Crystal On Silicon (LCOS) or Digital Light Projector (DLP) is called a reflective projector because light passes through the Liquid Crystal Display (LCD) panel as the light valve module when the projector is operated, and thus the projector displays images based on the principle of light reflection.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An optical path adjustment mechanism, comprising:

a base;

a frame connected to the base by a first pair of flexible members;

the bearing seat is arranged in the frame and is connected with the frame by a second pair of flexible pieces;

the first coil is arranged on the frame;

the second coil is arranged on the bearing seat; and

a magnet having a first side and a second side, the first coil is located on the first side and has a shortest distance d1 from the first side, the second coil is located on the second side and has a shortest distance d2 from the second side, and the optical path adjusting mechanism satisfies the condition of 1< d1/d2< 2.

2. An optical path adjustment mechanism, comprising:

a base;

a frame connected with the base by a first transmission piece;

the bearing seat is arranged in the frame and is connected with the frame by a second transmission machine member;

the first coil is arranged on the frame;

the second coil is arranged on the bearing seat; and

the magnet is provided with a first side, the first coil and the second coil are both positioned 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.

3. The optical path adjusting mechanism according to claim 1 or 2, further comprising:

an optical element is arranged on the bearing seat.

4. The optical path adjustment mechanism according to claim 3, wherein the optical element is a lens or a mirror.

5. The optical path adjusting mechanism according to claim 1 or 2, wherein the optical path adjusting mechanism satisfies one of the following conditions:

(1) the total number of the magnets of the optical path adjusting mechanism is one;

(2) the magnet of the light path adjusting mechanism is fixed on a magnet seat, and the magnet seat is fixed on the base.

6. The optical path adjustment mechanism according to claim 1 or 2, wherein the frame surrounds the carrier.

7. The optical path adjusting mechanism of claim 2, wherein the first transmission mechanism is a first pair of flexible members, the second transmission mechanism is a second pair of flexible members, the first pair of flexible members defines a first direction, and the second pair of flexible members defines a second direction.

8. The optical path adjusting mechanism of claim 7, wherein at least two of the frame, the carrying seat, the first pair of flexible members and the second pair of flexible members are integrally formed.

9. The optical path adjusting mechanism of claim 7, further comprising an optical element disposed on the carrier, wherein the optical element swings around the first direction and the second direction.

10. A method for manufacturing an optical path adjustment mechanism, comprising:

providing a base, a frame and a bearing seat, and arranging an optical element on the bearing seat;

arranging a first pair of flexible pieces to connect the base and the frame;

arranging a second pair of flexible pieces to connect the frame and the bearing seat;

arranging a first coil on the frame;

arranging a second coil on the bearing seat; and

disposing a magnet on the substrate, the magnet having a first side and a second side, wherein the first coil is located on the first side and has a shortest distance d1 from the first side, and the second coil is located on the second side and has a shortest distance d2 from the second side, and the arrangement is such that 1< d1/d2< 2.