TWI670518B - Light path adjustment device - Google Patents

Abstract

An optical path adjusting device comprises an outer frame, an optical component, a coil set and a control mechanism. The optical component is disposed in the outer frame, the coil set is disposed outside the optical component, and the coil set has a plurality of layers of coils substantially stacked along the normal direction of the optical component. The control mechanism is disposed between the optical element and the outer frame.

Description

 Optical path adjustment device  

The present invention relates to an optical path adjusting device.

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 device can be provided to change the traveling light path in the device to provide various effects such as improving imaging resolution and improving picture quality. However, the number, weight, and volume of the components of the conventional optical path adjusting device are large, and it is difficult to further miniaturize. Therefore, there is a need for an optical path adjusting device that is simple in structure, high in reliability, and capable of greatly reducing weight and volume.

Other objects and advantages of the present invention will be further understood from the technical features disclosed in the embodiments of the present invention.

An embodiment of the present invention provides an optical path adjusting device including an outer frame, an optical component, a coil assembly, and a control mechanism. The optical component is disposed in the outer frame, the coil set is disposed outside the optical component, and the coil set has a plurality of layers of coils substantially stacked along the normal direction of the optical component. The control mechanism is disposed between the optical element and the outer frame.

According to the design of the embodiment of the present invention, since at least part of the structure of the actuating assembly can be directly disposed on the actuating member, the overall volume, weight and component number of the optical path adjusting device can be greatly reduced, thereby facilitating miniaturization or thinning of the optical path adjusting device. To match a variety of microelectronic devices.

Other objects and advantages of the present invention will become apparent from the technical features disclosed herein. The above and other objects, features, and advantages of the present invention will become more apparent from the understanding of the accompanying claims.

100‧‧‧Light path adjustment device

110‧‧‧actuation

112‧‧‧ lenses

112a, 112b‧‧‧ fixing holes

116‧‧‧ Groove

120‧‧‧Activity components

122‧‧‧ coil group

122a‧‧‧ coil

124‧‧‧ Magnet

130‧‧‧Connecting parts

130a‧‧‧ neck

132, 134‧‧‧ leaf spring

132a, 132b, 134a, 134b‧‧‧ fixing holes

132d, 134d‧‧‧ Connections

140‧‧‧ frame

140a, 140b‧‧‧ fixing holes

150‧‧‧Piezoelectric components

200‧‧‧Light path adjustment device

210‧‧‧Activity

212‧‧‧ lenses

214‧‧‧ lens holder

214a, 214b‧‧‧ fixing holes

216‧‧‧ Groove

220‧‧‧Activity components

222‧‧‧ coil group

224‧‧‧ magnet

230‧‧‧Connecting parts

232‧‧‧ leaf spring

232a, 232b, 232c, 232d‧‧‧ fixing holes

232e‧‧‧ Ring Department

232f, 232g‧‧‧ extension

240‧‧‧ frame

240a, 240b‧‧‧ fixing holes

300‧‧‧Optical device

310‧‧‧Lighting system

312‧‧‧Light source

314‧‧‧ Beam

314a‧‧‧Subimage

316‧‧‧ color wheel

317‧‧‧Light column

318‧‧‧ lens group

319‧‧‧Internal total reflection稜鏡

320‧‧‧Digital micromirror device

330‧‧‧Projection lens

340‧‧‧Light path adjustment device

400‧‧‧ screen

A‧‧‧Rotary axis

M‧‧‧ initial position

N‧‧‧ normal direction

P, Q‧‧‧ direction of rotation

Θ‧‧‧ angle

W‧‧ Aspect aspect ratio

X‧‧‧ length

Y‧‧‧Width

Fig. 1 is an exploded perspective view showing an optical path adjusting device according to an embodiment of the present invention.

2 is a schematic view of the optical path adjusting device of FIG. 1 after assembly.

3 is a schematic view showing an actuated state of an actuating member according to an embodiment of the present invention.

Fig. 4 is an exploded perspective view showing an optical path adjusting device according to another embodiment of the present invention.

FIG. 5 is a schematic view of the optical path adjusting device of FIG. 4 after assembly.

Fig. 6A is a schematic view showing an optical path adjusting device according to an embodiment of the present invention, and Fig. 6B is an enlarged cross-sectional view taken along line A-A' of Fig. 6A.

Fig. 7A is a schematic view showing an optical path adjusting device according to another embodiment of the present invention, and Fig. 7B is an enlarged cross-sectional view taken along line B-B' of Fig. 7A.

Fig. 8 is a schematic view showing the configuration of a coil accommodating structure according to an embodiment of the present invention.

Figure 9 is a schematic view showing the definition of the aspect ratio of the neck of the connector.

Figure 10 is a schematic illustration of an actuation assembly in accordance with another embodiment of the present invention.

Figure 11 is a schematic diagram of an optical path adjusting device applied to an optical system according to an embodiment of the present invention.

Fig. 1 is an exploded perspective view showing an optical path adjusting device according to an embodiment of the present invention. As shown in FIG. 1 , the optical path adjusting device 100 includes an actuating member 110 , an actuating component 120 , a connecting member 130 , and a frame or outer frame 140 . In this embodiment, the actuating member 110 is deflectable. The optical component is, for example, a lens 112. In another embodiment, the optical component can be, for example, a lens (Lens) or a mirror. The actuation component 120 can be, for example, an electromagnetic induction component including the coil assembly 122 and the magnet 124. And the connecting member 130 can be, for example, two leaf springs 132, 134 with elastic restoring force. The two ends of the leaf spring 132 may have fixing holes 132a and 132b. The two ends of the leaf spring 134 may have fixing holes 134a and 134b. The two ends of the lens 112 may be provided with fixing holes 112a and 112b, and both ends of the frame 140 may be disposed. Fixing holes 140a, 140b. In an assembly embodiment, the frame 140 is disposed outside the actuator 110, and the magnet 124 is fixed to the frame 140. The coil assembly 122 can be disposed outside the lens 112 and can be wound around the periphery of the lens 112, for example, a leaf spring. One end of the plate 132 can be fixed to the lens 112 via a fixing hole 132a, 112a corresponding to the position, for example, by a fixing member such as a screw (not shown), and the other end of the leaf spring 132 can be fixed to the frame via the corresponding fixing holes 132b, 140a. 140, the leaf spring 132 is overlapped between the lens 112 and the frame 140. Furthermore, one end of the leaf spring 134 can be fixed to the lens 112 via a fixing hole 134a, 112b corresponding to the position by a fixing member such as a screw (not shown), and the other end of the leaf spring 134 can be via the corresponding fixing hole 134b, The 140b is fixed to the frame 140 such that the leaf spring 134 is overlapped between the lens 112 and the frame 140. The assembled optical path adjusting device 100 is as shown in FIG. Therefore, the connection direction of the leaf springs 132, 134 overlapping the two ends of the lens 112 can substantially revolve the rotation axis A of the cooperation member 110, and the lens 112 can rotate clockwise or counterclockwise about the rotation axis A, that is, the lens 112 can rotate. The axis A is a quasi-reciprocating twist. As shown in FIG. 3, in an embodiment, the electromagnetic force between the coil group 122 and the magnet 124 can rotate the lens 112 by an angle θ from the initial position M in the rotation direction P around the rotation axis A, and the leaf spring 132, The restoring force of 134 can rotate the lens 112 back to the initial position M in the opposite rotational direction Q. In another embodiment, another electromagnetic force can be applied between the coil assembly 122 and the magnet 124 to assist the restoring force of the leaf springs 132, 134. The lens 112 is rotated back to the initial position M in the opposite rotational direction Q, so that the lens 112 can be reciprocally oscillated to different positions to deflect the incident light to different directions, thereby obtaining the effect of adjusting or changing the traveling path of the light. In one embodiment, the rotational angle θ of the actuator may range from 0.1 to 1 degree, preferably from 0.2 to 0.5 degrees, and may be, for example, 0.32 degrees. The optical path adjusting device of the embodiment of the present invention adjusts or changes the optical path, and different effects can be generated according to actual needs, for example, can be used to improve projection resolution, improve image quality (eliminate dark areas, soften image edges), and the like without limitation. The arrangement position and arrangement of the optical path adjusting device in a device to be used (for example, a display device, a projection device, etc.) are also not limited at all. Furthermore, the electromagnetic induction component of the above embodiment only needs to be able to produce the effect of driving the actuating member 110, and the constituent members thereof are not limited. In another embodiment, for example, another coil group may be used as a magnetic body instead of the magnet. The other coil group disposed in the frame 140 can also generate an electromagnetic force with the coil group wound around the actuator 110 to drive the actuator 110. In addition, in various embodiments of the present invention, the actuating form of the actuating member is not limited, and the actuating member may be, for example, a rotating member, a vibrating member or a linking member. Furthermore, the connecting member only needs to have a property of being able to change in the direction of returning to the original size and shape when the external force is removed after the deformation, for example, it can be at least slightly elastic or flexible, and the type of the connecting member is not limited at all. The shape of the leaf spring in the embodiment of the present invention is not limited. Referring to FIG. 1 again, in an embodiment, the connecting portion 132d of the leaf spring 132 connected to the frame 140 can be substantially perpendicular to the frame spring 140 and connected to the frame 140. The connecting portion 134d is not limited. In another embodiment, the connecting portion 132d can be substantially parallel to the connecting portion 134d but is not limited. Moreover, in one embodiment, each of the non-planar leaf springs 132 or 134 may have two faces that are angled. In another embodiment, each of the non-planar leaf springs 132 or 134 may have substantially perpendicular to each other ( The two faces of the angle of about 90 degrees allow the center of rotation of the leaf springs 132, 134 to substantially coincide with the center of mass of the lens 112 but are not limited.

According to the design of the above embodiment, since at least part of the structure (for example, the coil group) of the actuator assembly is directly disposed on the optical element that can deflect the light, the volume, weight, and number of components of the optical path adjusting device can be greatly reduced. The overall structure can be simplified to improve reliability, and it is advantageous for miniaturization or thinning to be compatible with various microelectronic devices.

Fig. 4 is an exploded perspective view showing the optical path adjusting device according to another embodiment of the present invention, and Fig. 5 is a schematic view showing the optical path adjusting device of Fig. 4 after being assembled. As shown in FIG. 4 and FIG. 5, in the embodiment, the actuating member 210 of the optical path adjusting device 200 can include, for example, a lens 212 and a lens holder 214 for receiving the lens 212. The actuation component 220 can be, for example, a coil assembly. The electromagnetic induction component of the 222 and the magnet 224, the coil assembly 222 can be wound around the lens holder 214 and can be wound around the periphery of the lens holder 214, for example, and the magnet 224 can be fixed to the frame 240. The connector 230 can be, for example, an integrally formed leaf spring 232 that spans from one end of the lens holder 214 to the other end. The shape of the leaf spring 232 is not limited. In this embodiment, the leaf spring 232 has a ring portion 232e and two extending portions 232f and 232g extending from the ring portion 232e toward the both ends of the actuating member 210, and two extending portions 232f, The direction of extension of 232g can substantially coincide with the axis of rotation A. The two ends of the leaf spring 232 may have fixing holes 232a, 232b, 232c, and 232d. The two ends of the lens holder 214 may be respectively provided with a fixing hole 214a (corresponding to the fixing 232b) and a fixing hole 214b (corresponding to the fixing hole 232c), and the frame 240 The fixing holes 240a (corresponding to the fixing holes 232a) and the fixing holes 240b (corresponding to the fixing holes 232d) can be respectively disposed at both ends. The integrally formed leaf spring 232 can be placed between the lens holder 214 and the frame 240 by fixing the fixing member such as a screw (not shown) via the corresponding fixing holes. The extending direction of the leaf spring 232 is substantially the rotation axis A of the cooperation member 210, and the actuating member 210 (the lens 212 together with the lens holder 214) can rotate clockwise or counterclockwise about the rotation axis A, and the restoring force of the leaf spring 232 can be activated. The member 210 is rotated back to the initial position in the opposite rotational direction. In another embodiment, another electromagnetic force can be applied between the coil assembly 222 and the magnet 224 to assist the restoring force of the leaf spring 232 to rotate the actuator 210 back in the opposite rotational direction. The initial position, therefore, the actuator 210 can be reciprocally oscillated to different positions to allow the lens 212 to deflect the incident light into different directions to obtain the effect of adjusting or varying the path of travel of the light.

According to the design of the above embodiment, since at least part of the structure (for example, the coil group) of the actuating assembly is directly disposed on the lens holder of the actuating member, the overall volume, weight and component number of the optical path adjusting device can be greatly reduced, thereby facilitating the optical path. The adjustment device is miniaturized or thinned to match various microelectronic devices.

Fig. 6A is a schematic view showing an optical path adjusting device according to an embodiment of the present invention, and Fig. 6B is an enlarged cross-sectional view taken along line A-A' of Fig. 6A. As shown in FIG. 6A, the coil group 122 has a plurality of layer coils 122a stacked substantially in the normal direction N of the lens 112, for example, the area occupied by the wiring plane of the coil group 122 can be reduced, and the coil group 122 can be wound. A range is available, and the control member or the transmission member such as the leaf springs 132, 134 may be outside the range of the coil assembly 122, for example, to reduce the possibility of the actuator 210 interfering with other components during actuation. . As shown in FIG. 6B, the periphery of the lens 112 can form a receiving structure for accommodating the coil assembly 122. In this embodiment, the periphery of the lens 112 can have a convex portion and a concave portion to form a recess 116. The periphery of the lens 112 has an L-shaped end face structure, and the coil assembly 122 can be received in the recess 116. Fig. 7A is a schematic view of an optical path adjusting device according to another embodiment of the present invention, and Fig. 7B is an enlarged cross-sectional view taken along line B-B' of Fig. 7A. As shown in FIG. 7B, when the actuator 210 is not driven, the lens 212 and the magnet 224 are substantially at the same horizontal plane to save space occupied by the member, and the periphery of the lens holder 214 can form a receiving structure for accommodating the coil assembly 222. In this embodiment, the periphery of the lens holder 214 may have two convex portions and a concave portion to form a recess 216, and the periphery of the lens holder 214 has a C-shaped or U-shaped end surface structure, and the coil assembly 222 can be received within the recess 216. That is, the accommodating structure of the accommodating coil group may be a groove, which may be formed at different positions of the actuator and may have different shapes such as a C-shape or a U-shape, but is not limited, and only needs to be provided for accommodation. The effect of the coil set is sufficient. When the coil assembly is housed in the accommodating structure of the actuating member, the space occupied by the coil group can be omitted, the volume of the whole device can be further reduced, and the wear contact between the coil group and other components can be avoided, and the reliability can be improved. Furthermore, the arrangement of the coil accommodating structure on the periphery of the actuator is not limited at all. For example, the coil accommodating structure may be a continuous groove continuously formed on the periphery of the actuator as shown in FIG. 6A, or as shown in FIG. A plurality of spaced apart grooves 216 are formed in the periphery of the actuator 210.

The connecting members of the above embodiments are merely illustrative, and the connecting member disposed between the optical component and the frame may be various power transmitting transmission members or a control mechanism for damping vibration or controlling motion, for example, for example, for example, for example, Springs, leaf springs, wire springs, flexible sheet-like parts or flexible leaf-shaped parts, and so on. Furthermore, optical elements such as lenses may be provided on other carriers and are not limited to lens holders, and the frames may be frames or frames of different shapes and are not limited.

In an embodiment, the wire diameter of the coil group may be less than 0.2 mm, for example, 0.05 mm, and the manner in which the coil group is fixed on the actuating member is not limited, for example, gluing may be used (for example, UV dispensing or outer enamelled wire glue). ), heat fusion, socket, etc. Moreover, in an embodiment, the power of the driving coil group may be less than 200 mW.

In one embodiment, the thickness of the connecting member 130 can be less than 0.5 mm, for example, the thickness can be 0.1 mm, 0.15 mm, or 0.2 mm, and the material of the connecting member 130 can be, for example, an elastic material (such as a spring, a leaf spring, or a wire spring). Or metal materials (such as stainless steel, iron, copper, aluminum). Furthermore, since the neck portion 130a of the connecting member 130 is too thin to be easily broken and too thick, the movement may be unsmooth, so that the neck width 130a of the connecting member 130 may have an aspect ratio W of 0.5-1, and a preferred range is 0.6. A preferred range is -0.9, and may be, for example, 0.75. As shown in Fig. 9, the aspect ratio W of the neck portion 130a is defined as the length X divided by the width Y (W = X / Y).

In one embodiment, the material of the lens may be glass, plastic or metal film coated glass, plastic (such as silver plated or aluminized), and the connector may utilize self-tapping, nut, heat sealing, or dispensing. The method is to overlap the lens or the lens holder. If the aperture is too small, the lens is easily cracked. If the aperture is too large, the screw is not easily locked or slipped. Therefore, in an embodiment, the fixing hole on the lens can be M1.2 self-tapping screw. Hole (aperture 0.85-1.1mm), M1.6 self-tapping screw hole (aperture 1.2-1.4mm), M1.7 self-tapping screw hole (aperture 1.3mm-1.5mm) or M2 self-tapping screw hole (aperture 1.5mm- 1.8mm).

The material of the frame may be, for example, metal (aluminum alloy, magnesium alloy, etc.) or plastic, and is not limited. The material of the magnet may be a hard magnet or a soft magnet, and may be, for example, a neodymium iron boron magnet (NdFeB). If the magnet is too large, it will increase the occupied space. If the magnet is too small, the magnetic force is insufficient. Therefore, the size of the magnet is preferably 14 mm × 7 mm × 5 mm - 0.5 mm × 0.5 mm × 0.5 mm, for example, 9 mm × 1.9 mm × 0.8. Mm.

In an embodiment, the natural frequency of the actuating member can be adjusted by changing the weight of the screw, adding the mass, setting the pressing plate, etc., so that the natural frequency of the actuating member can be greater than 90 Hz to avoid resonance, and the higher natural frequency can be improved. The reaction speed of the actuator and the use of a smaller actuator allows the actuator to reach a predetermined angle of rotation. Furthermore, the movement type can be controlled by the connection member locking the pound force. In one embodiment, the locking force of the connecting member can be 0.5-3 kg-mm, and a preferred range can be 0.8-2.5 kg- A better range of mm, 1-2 kg-mm. In one embodiment, the connector, the lens and the frame can be integrally formed by the same material (for example, plastic or metal), or two of the components can be integrally formed first, for example, the connector, the lens is integrally formed or the connector, the frame The body can be integrally formed and then combined with the remaining components. Further, a shock absorber such as rubber may be filled between the frame and other internal members to provide a shock absorbing effect.

In an embodiment, the light path adjusting device may have a weight of less than 5 g, for example, 1.6 g, and a volume of less than 40 mm x 40 mm x 10 mm, for example, 21 mm x 21 mm x 3.6 mm. The actuation frequency of the actuation assembly can be 24 Hz - 120 Hz, and the electromagnetic induction component can be, for example, a voice coil motor. The type of the actuating assembly is not limited, and it is only necessary to obtain the effect of driving the actuating member to make it reciprocate. In another embodiment, as shown in FIG. 10, the actuation assembly can include, for example, a piezoelectric element 150 disposed on the lens 112. The piezoelectric element 150 can be compressed or stretched by applying an electric field to the piezoelectric element 150. Deformation means that the electric energy can be converted into mechanical energy to make the lens 112 reciprocate to achieve the effect of adjusting the optical path.

Figure 11 is a schematic diagram of an optical path adjusting device applied to an optical system according to an embodiment of the present invention. Referring to Fig. 11, optical device 300 includes illumination system 310, digital micromirror device 320, projection lens 330, and optical path adjustment device 340. Therein, the illumination system 310 has a light source 312 adapted to provide a light beam 314, and the digital micromirror device 320 configures a transmission path of the light beam 314. The digital micromirror device 320 is adapted to convert the light beam 314 into a plurality of sub-images 314a. In addition, the projection lens 330 is disposed on the transmission path of the sub-images 314a, and the digital micro-mirror device 320 is located between the illumination system 310 and the projection lens 330. In addition, the optical path adjusting device 340 can be disposed between the digital micro-mirror device 320 and the projection lens 330, for example, between the digital micro-mirror device 320 and the internal total reflection 稜鏡 319 or can be internally reflected 319 and projected internally. The lenses 330 are located between the transmission paths of the sub-images 314a. In the optical device 300 described above, the light beam 314 provided by the light source 312 sequentially passes through a color wheel 316, a light integration rod 317, a lens group 318, and a TIR Prism 319. If the light source 312 is composed of a diode (LED or laser), the color wheel 316 can also be omitted. Thereafter, internal total reflection 稜鏡 319 reflects beam 314 to digital micromirror device 320. At this time, the digital micromirror device 320 converts the light beam 314 into a plurality of sub-images 314a, and the sub-images 314a sequentially pass through the internal total reflection 稜鏡319 and the optical path adjusting device 340, and the sub-images 314a are transmitted via the projection lens 330. Projected on the screen 400. In the present embodiment, when the sub-images 314a pass through the optical path adjusting device 340, the optical path adjusting device 340 changes the transmission paths of some of the sub-images 314a. That is, the sub-images 314a passing through the optical path adjusting device 340 are projected on a first position (not shown) on the screen 400, and the sub-images 314a passing through the optical path adjusting device 340 in another portion of the time. Projected on a second position (not shown) on the screen 400, wherein the first position and the second position differ by a fixed distance in the horizontal direction (X-axis) or/and the vertical direction (Z-axis). In the present embodiment, since the optical path adjusting device 340 can move the imaging position of the sub-images 314a in the horizontal direction or/and the vertical direction by a fixed distance, the horizontal resolution or/and the vertical resolution of the image can be improved. Of course, the above embodiments are merely illustrative. The optical path adjusting device of the embodiment of the present invention can be applied to different optical systems to obtain different effects, and the setting position and arrangement manner of the optical path adjusting device in the optical system are not limited at all.

While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application. In addition, any of the objects or advantages or features of the present invention are not required to be achieved by any embodiment or application of the invention. In addition, the abstract sections and headings are only used to assist in the search of patent documents and are not intended to limit the scope of the invention.

Claims (10)

An optical path adjusting device comprises: an outer frame; an optical component disposed in the outer frame and transmissing or reflecting multi-pixel planar image light emitted by a light valve; a coil set wound around the optical component And the coil set has a plurality of layers of coils substantially stacked along a normal direction of the optical element; and a control mechanism is disposed between the optical element and the outer frame. The optical path adjusting device according to claim 1, wherein the optical component is a plane mirror, and the coil assembly is wound around a circumference of the plane mirror. The optical path adjusting device according to claim 1, wherein the optical component is disposed on a carrier, and the coil assembly is wound around a periphery of the carrier. The optical path adjusting device according to claim 1, wherein the control mechanism is a spring, a leaf spring, a wire spring, a flexible sheet member or a flexible leaf device. The optical path adjusting device according to claim 1, wherein the coil bobbin is wound out of a range, and the control mechanism is located outside the loop winding range. An optical path adjusting device comprises: a frame; a magnetic body disposed on the frame; An interlocking member comprising an optical component capable of transmitting or reflecting multi-pixel planar image light emitted by a light valve and housed in the frame; a coil set wound substantially parallel to the linking member a surface in the direction of the line; and a transmission member coupled between the linkage and the frame. The optical path adjusting device of claim 6, wherein when the linking member is driven and rotated in a first rotational direction, the transmitting member applies the linking member to rotate in a direction opposite to the first rotational direction. Resilience. The optical path adjusting device of claim 6, wherein the optical component is a lens, the linking component comprises the lens and a lens holder for accommodating the lens, the coil group is disposed around the periphery of the lens holder And the magnetic body comprises a magnet or a coil. The optical path adjusting device according to claim 6, wherein the transmitting member is two leaf springs disposed at two ends of the linking member, and each of the leaf springs overlaps the linking member and the frame respectively, and the two A line direction of the leaf springs substantially coincides with a rotating shaft of the linking member. The optical path adjusting device of claim 6, wherein the transmitting member is a leaf spring spanning the linking member, the leaf spring having a ring portion and the ring portion facing the two ends of the linking member An extended two extensions, and each of the extensions overlaps the linkage and the frame respectively.