TWI431399B - Motor for color wheel, color wheel module, and projection apparatus - Google Patents

Description

Color wheel motor, color wheel module and projection device

The invention relates to a color wheel motor, a color wheel module and a projection device, in particular to a color wheel motor with a rotating shaft position detecting function, a color wheel module thereof and a projection device.

With the development of projection technology and the reduction in the price of related components, projectors have been widely used in various applications. At present, it is mainly projected by a plurality of color light projections in a manner of synthesizing color images. In order to accurately project the correct color image, the color wheel and the digital micromirror device (DMD) must be synchronized in order to accurately project the correct color image. Effective control, so the detection of the relative position of the color wheel is indispensable. Since the rotation of the color wheel is realized by the motor, the rotation state of the color wheel is determined by the rotation state of the motor shaft. At present, a Timing Index (TIM) is attached to the color wheel or the motor shaft, and an optical sensor is used to detect the time mark to determine the rotation state of the motor shaft. The rotation state may include the rotation speed. And the relative rotation angle relationship is also used as the feedback information for controlling the motor rotation speed, thereby achieving the purpose of synchronizing the color wheel and the digital micromirror device.

In general, the motor is a single component, and the detection of the above position can only be set independently of the electromechanical structure of the motor, so that the time stamp can only be attached to the outside of the motor, for example, the portion of the motor shaft exposed to the motor housing; The optical sensor is also disposed outside the motor. In most current projector architectures, the optical sensors are exposed, so dust or other particles flowing inside the projector may be deposited on the optical sensor. For example, in a continental dry climate region, dust is often present, and the cooling airflow in the projector also contains a large amount of dust. When the deposition on the optical sensor is severe, the optical sensor detection reliability is reduced or even failed.

In order to solve this problem, the motor and the detecting device are separately covered by a casing to isolate the dust outside the casing, and the color wheel is engaged with the protruding motor shaft from the outside of the casing. However, the motor is a high-speed electronic device, which is often accompanied by high heat. If the heat is not dissipated in time, the stability of the motor itself will be affected, and the above-mentioned extra casing coating will increase the difficulty of heat dissipation of the motor. If other open occlusion structures are placed next to the optical sensor to impede dust deposition, since the structure is still open, there is still dust deposition on the optical sensor. After a period of operation, the optical sensor is still extremely Poor deposition may result in reduced detection reliability or even failure.

It is apparent that the foregoing method of suppressing the deposition of dust by the casing or other shielding structure may introduce heat dissipation problems or still fail to effectively prevent dust deposition. Therefore, it is necessary to propose a solution that avoids an increase in heat dissipation burden and can effectively prevent dust deposition.

In view of the foregoing problems, the present invention provides a color wheel motor and a color wheel module thereof and a projection device. The motor is integrated with a position detecting module to provide the position detection by using a dustproof structure of the housing itself. The detection environment of the module is dusty, so it can effectively suppress the influence of dust, particles and the like on the detection of the position detection module, and does not significantly increase the heat dissipation load of the motor.

The motor of the present invention is for rotating a color wheel. The motor includes a housing, a rotor shaft and a position detecting module. The housing has a substantially sealed receiving space and a through hole, and the through hole communicates with the receiving space. The rotor shaft includes a first portion and a second portion. The first portion is disposed in the accommodating space, and the second portion protrudes from the through hole in the housing, and the color wheel is fixed on the second portion. The position detecting module is configured to detect a rotational position of the rotor shaft. The position detecting module includes a detecting object and a detecting component. The detecting component is disposed on the first portion, and the detecting component is The housing is mounted to detect the detected object.

Thereby, the detecting behavior of the position detecting module occurs inside the casing, effectively reducing the influence of external dust on the detection of the position detecting module; in other words, the motor of the present invention has the casing itself The sealing property substantially isolates the external dust or particles, and does not substantially reduce or hinder the heat dissipation path of the motor, so that the detection environment of the position detecting module is provided, and the heat dissipation burden of the motor is not significantly increased. The present invention can effectively solve the problem of poor dustproof effect or increased heat dissipation burden in the prior art.

The color wheel module of the present invention comprises a motor and a color wheel. The motor includes a housing, a rotor shaft and a position detecting module. The housing has a substantially sealed receiving space and a through hole, and the through hole communicates with the receiving space. The rotor shaft includes a first portion and a second portion. The first portion is disposed in the accommodating space, and the second portion protrudes from the through hole. The position detecting module is configured to detect a rotational position of the rotor shaft. The position detecting module includes a detecting object and a detecting component. The detecting component is disposed on the first portion, and the detecting component is The housing is mounted to detect the detected object. The color wheel is fixed to the second portion.

Similarly, the color wheel module of the present invention adopts the motor structure of the present invention, so that the position detecting module can perform detection in a dust-free environment, thereby avoiding excessive deposition of dust or particles and affecting the position detecting mode. The normal operation of the group, thereby extending the overall effective operating life or maintenance cycle of the color wheel module.

The projection device of the present invention comprises a motor, a color wheel, a light source and a controller. The motor includes a housing, a rotor shaft and a rotation speed detecting module. The housing has a substantially sealed receiving space and a through hole, and the through hole communicates with the receiving space. The rotor shaft protrudes outward from the accommodating space and protrudes through the through hole to protrude from the housing. The speed detecting module is disposed in the accommodating space, the module has a marker disposed on a circumferential surface of the rotor shaft, and a sensor is disposed on the housing to detect the marker Rotation frequency. The color wheel is fixed to an end of the rotor shaft protruding from the housing. The light source projects a beam of light through a surface of the color wheel. The controller is electrically connected to the motor and controls the rotational speed of the motor output according to the rotational frequency outputted by the rotational speed detecting module.

Similarly, the projection device of the present invention substantially adopts the color wheel module of the present invention, so that the rotation speed detecting module can perform detection in a dust-free environment to effectively detect the rotation frequency of the marker. In turn, the rotational speed of the motor output is accurately controlled to achieve the requirements of color wheel synchronization.

In short, the color wheel motor of the present invention, the color wheel module thereof and the projection device directly use the dustproof structure of the motor casing itself to form a substantially sealed accommodating space, and provide detection for detecting the rotation state of the rotor shaft. The detection environment of the module is less dusty, and the heat dissipation burden of the motor is not significantly increased, so that the dustproof and heat dissipation effects can be taken into consideration, and the problem of poor dustproof effect or increased heat dissipation burden in the prior art can be effectively solved.

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

Please refer to FIG. 1 and FIG. 2, FIG. 1 is a schematic view of a color wheel module 1 according to a preferred embodiment of the present invention, and FIG. 2 is a cross-sectional view of the color wheel module 1 of FIG. The color wheel module 1 includes a fixing base 12, a motor 14 and a color wheel 16. The motor 14 is fixed to the fixed base 12 and electrically connected to a wire 142 for controlling the motor 14. The color wheel 16 is mounted to the motor 14 and is controlled for synchronization with the color wheel 16 by controlling the rotational state of the motor 14. The color wheel module 1 is fixed to other structures by a fixing base 12, such as the inside of the housing of the projector.

Further, the motor 14 includes a housing 144, a rotor shaft 146, a plurality of stators 148, a plurality of rotor magnets 150, a position detecting module 152, and a control circuit module 154. The housing 144 has an accommodating space 1442 and a first through hole 1444. The first through hole 1444 communicates with the accommodating space 1442. The rotor shaft 146 includes a first portion 1462 and a second portion 1464. The first portion 1462 is disposed in the accommodating space 1442, and the second portion 1464 protrudes from the first through hole 1444 to the housing 144; that is, the rotor shaft 146 is occupied by the accommodating space. The inner opening 1442 extends through the first through hole 1444 to protrude from the housing 144. The color wheel 16 is secured to the second portion 1464 by a retaining ring 17; that is, to one end of the rotor shaft 146 that projects from the housing 144. The stator 148 is disposed in the accommodating space 1442 and fixed to the housing 144. The rotor magnet 150 is correspondingly fixed to the first portion 1462 of the rotor shaft 146. The control circuit module 154 is disposed in the accommodating space 1442 and electrically connected to the wire 142 and the stator 148 to control the magnetism of the stator 148 to achieve the purpose of driving the rotor shaft 146 to rotate. The rotor shaft 146 is provided by the bearing 156. It reduces its wear and increases the stability of its rotation, but the invention is not limited thereto. The position detecting module 152 includes a detecting object 1522 and a detecting component 1524. The detecting object 1522 is disposed on the first portion 1462. As a marker, the detecting component 1524 is mounted on the housing 144 to detect the detecting. The object 1522 detects the marker, for example, with a sensor. Thereby, the position detecting module 152 can detect the rotational position of one of the rotor shafts 146.

In this embodiment, the position detecting module 152 is disposed in the accommodating space 1442 and electrically connected to the control circuit module 154. Therefore, the electrical control can be directly integrated into the control circuit module 154, and then The external connection with the color wheel module 1 is not limited thereto. For example, the housing 144 is separately wired out, and the wiring can be separately pulled out or integrated into the connection interface between the control circuit module 154 and the cable 142. The position detecting module 152 further includes a circuit board 1526 electrically connected to the control circuit module 154. The detecting component 1524 includes an optical sensor and is disposed on the circuit board 1526 via the circuit board 1526 and the control circuit module. 154 electrical connection. The detecting object 1522 is disposed on the one-sided surface 1466 of the first portion 1462 of the rotor shaft 146 corresponding to the optical sensor. The circumferential surface 1466 has a first reflectivity, and the detecting object 1522 has a detecting surface 1528 having a first The two reflectances are different from the first reflectivity. Due to the difference in reflectance between the two, the optical sensor receives different reflections from the intensity of the light, thereby judging the frequency or detection of the detection object 1522 relative to the optical sensor. The rotation frequency of the object 1522 (that is, the rotation frequency of the rotor shaft 146 is inferred) and the relationship of the object 1522 to time (that is, the rotational position of the rotor shaft 146 can be inferred), and the rotation speed of the motor 14 is controlled and adjusted to achieve the color. The purpose of the wheel 16 synchronization. It should be noted that the position detecting module 152 can also be used as a speed detecting module because it can detect the rotating frequency of the rotor shaft 146.

As shown in FIG. 2, the main passage of the housing 144 is the first through hole 1444. Although the rotating rotor shaft 146 passes, it is supported by the bearing 156 or other types of bearings (for example, a bushing). The through hole 1444 still has a certain degree of sealing effect, so the accommodating space 1442 is in a substantially sealed state. Therefore, the color wheel module 1 of the present invention provides the detection environment of the position detecting module 152 with less dust, and does not significantly increase the heat dissipation burden of the motor 14, so that the dustproof and heat dissipation effects can be balanced, and the dustproof effect in the prior art is effectively solved. It is better to increase the heat dissipation burden for dustproofing. Further, the upper housing 144 is usually made of a metal material and is opaque, so that the substantially sealed accommodating space 1442 can be used to eliminate the light interference and improve the position detecting mode. The detection accuracy of group 152.

It should be noted that, in the foregoing embodiment, the position detecting module 152 generates a difference in reflected light intensity by using the difference in reflectance as the basis for the foregoing judgment. In practice, the detecting object 1522 is accustomed to use the black patch as a time stamp, so the first reflectance is greater than the second reflectivity; but the invention is not limited thereto, and in principle only the difference in reflectivity is required to make the position detect The test module 152 can be identified. Moreover, the light for sensing by the optical sensor is not limited to visible light, and the light source can be disposed close to the optical sensor, so that the optical sensor can sense strong light, so the detecting component 1524 A light source 1530 is further included for emitting light to the peripheral surface 1466 and the detecting surface 1528, and is reflected by the optical sensor for reflection; however, the invention is not limited thereto, for example, using ambient light as a light source or a light source. 1530 set up elsewhere. In addition, in practice, the optical sensor and the light source 1530 can be integrated into a single component for assembly. It is to be noted that, in the foregoing embodiment, the light is used as the medium detected by the position detecting module 152, but the invention is not limited thereto. For example, if the optical sensor is replaced by a magnetic sensor, and the detecting object 1522 is replaced by a magnet or other material having permanent magnetism, the magnetic sensor can sense the magnet to generate a magnetic field change signal to realize the position. The detection function of the detection module 152. At this time, the foregoing light source 1530 can be omitted, and will not be described again. In addition, in the foregoing embodiment, the detecting component 1524 is disposed on the upper wall of the housing 144, but the invention is not limited thereto. For example, when the housing 144 has a long tubular shape, the detecting component 1524 can also be disposed. On the side wall of the housing 144, the detecting object 1522 can still be effectively detected.

In the foregoing embodiment, the position detecting module 152 is disposed in the accommodating space 1442, but the invention is not limited thereto. Please refer to FIG. 3, which is a schematic diagram of a color wheel module 3 according to another embodiment of the present invention. The color wheel module 3 of FIG. 3 is substantially the same as the color wheel module 1 of FIG. 2, except that the position detecting module 152 of the color wheel module 3 is not entirely disposed in the receiving space 1442. However, only the relevant components actually participating in the light sensing are disposed in the accommodating space 1442. Therefore, in the embodiment, the housing 144 has a second through hole 1446 that communicates with the receiving space 1442. The circuit board 1526 is fixed to the housing 144 from the housing 144, so that the detecting component 1524 passes through the second through hole 1446. In order to detect the detected object 1522. At this time, the position detecting module 152 can be directly connected to the external control circuit from the outside of the housing 144 by the circuit board 1526. This design allows components not directly involved in light sensing (such as the circuit board 1526) to be disposed outside the housing 144, reducing the complexity of the component space configuration in the housing space 1442, and simplifying the assembly and maintenance of the position detecting module 152. Operation, such as replacement, cleaning operations, and the like. The foregoing descriptions of the components of the color wheel module 1 and variations thereof are also applicable to the color wheel module 3 of the present embodiment, and will not be described again.

Similarly, the color wheel module 3 of the present invention can also achieve the effects of dustproof and heat dissipation, effectively solve the problem of poor dustproof effect or increased heat dissipation burden in the prior art, and further improve the detection of the position detecting module 152. Measurement accuracy. Other functions of the color wheel module 3 can be directly referred to the related description of the color wheel module 3, and will not be described again.

Please refer to FIG. 4, which is a schematic diagram of a projection device 5 in accordance with a preferred embodiment of the present invention. The projection device 5 includes a color wheel module 52, a light source 54, a controller 56, an optical modulation device 58 (including, for example, an integrating column and a digital micromirror device), and a projection lens 60. The color wheel module 52 is a color wheel module of the present invention. Therefore, the related descriptions of the color wheel modules 1 and 3 can be directly referred to, and details are not described herein again. The light source 54 projects a light beam through a surface of the color wheel 526, filters the filter thereon to obtain various color lights, and then mixes the light through the optical modulation device 58 to modulate the desired projection light by the projection lens. 60 projected out. The controller 56 is electrically connected to the motor 524 of the color wheel module 52 via the cable 5242 of the motor 524. According to the position detection module (or the rotation speed detecting module) disposed on the motor 524, refer to the related drawings of the foregoing embodiment. The rotational frequency of the output controls the rotational speed output by the motor 524 to achieve the purpose of synchronizing the color wheel 526 with the optical modulation device 58.

Therefore, the projection device 5 of the present invention adopts the color wheel module of the present invention, so that the dustproof and heat dissipation effects can be taken into consideration, and the problem of poor dustproof effect or increased heat dissipation burden in the prior art is effectively solved, and further improved. The detection accuracy of the position detection module can accurately control the output speed of the motor to meet the requirements of color wheel synchronization. For other descriptions of the functions of the color wheel module or its motor, please refer to the description of the related embodiments, and no further details are provided.

Compared with the prior art, the color wheel motor of the present invention, the color wheel module thereof and the projection device directly use the dustproof structure of the motor casing itself to form a substantially sealed accommodating space, and provide the position detecting mode to detect dust. The environment does not significantly increase the heat dissipation of the motor, so it can balance the dustproof and heat dissipation effects, effectively solve the problem of poor dustproof effect or increase the heat dissipation burden in the prior art, thereby prolonging the overall effective operating life or maintenance cycle of the device; Ground, improve the detection accuracy of the position detection module, and improve the accuracy of the color wheel synchronization. In addition, since the position detecting module is integrated into the motor structure, the present invention can save the components of the bracket for fixing the detecting device in the prior art, and further reduce the volume of the color wheel module, in addition to simplifying the color wheel module. The difficulty in assembly also contributes to the miniaturization of the projection device.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

1, 3. . . Color wheel module

5. . . Projection device

12. . . Fixed seat

14. . . motor

16. . . Color wheel

17. . . M

52. . . Color wheel module

54. . . light source

56. . . Controller

58. . . Optical modulation device

60. . . Projection lens

142. . . Cable

144. . . case

146. . . Rotor shaft

148. . . stator

150. . . Rotor magnet

152. . . Position detection module

154. . . Control circuit module

156. . . Bearing

524. . . motor

526. . . Color wheel

1442. . . Housing space

1444. . . First through hole

1446. . . Second through hole

1462‧‧‧Part 1

1464‧‧‧Part II

1466‧‧‧Week

1522‧‧‧Detectives

1524‧‧‧Detection components

1526‧‧‧Circuit board

1528‧‧‧Detection surface

1530‧‧‧Light source

5242‧‧‧ cable

1 is a schematic view of a color wheel module in accordance with a preferred embodiment of the present invention.

Figure 2 is a cross-sectional view of the color wheel module of Figure 1.

Figure 3 is a schematic illustration of a color wheel module in accordance with another embodiment of the present invention.

Figure 4 is a schematic illustration of a projection apparatus in accordance with a preferred embodiment of the present invention.

1. . . Color wheel module

12. . . Fixed seat

14. . . motor

16. . . Color wheel

17. . . M

142. . . Cable

144. . . case

146. . . Rotor shaft

148. . . stator

150. . . Rotor magnet

152. . . Position detection module

154. . . Control circuit module

156. . . Bearing

1442. . . Housing space

1444. . . First through hole

1462. . . first part

1464. . . the second part

1466. . . Weekly

1522. . . Detector

1524. . . Detection component

1526. . . Circuit board

1528. . . Detection surface

1530. . . light source

Claims (13)

A color wheel module comprising: a motor, comprising: a housing having a substantially sealed receiving space and a first through hole, the first through hole communicating with the receiving space; a rotor rotating shaft comprising a first a portion and a second portion, the first portion is disposed in the accommodating space, the second portion protrudes from the first through hole in the housing; and a position detecting module is configured to detect one of the rotor shafts In the rotating position, the position detecting module includes a detecting object and a detecting component, the detecting component includes an optical sensor, the detecting object is disposed on the first portion, and the detecting component is mounted on the shell The body is configured to enable the optical sensor to detect the object; and a color wheel is fixed to the second portion. The color wheel module of claim 1, wherein the detecting component is disposed in the accommodating space. The color wheel module of claim 1, wherein the housing has a second through hole that communicates with the accommodating space, the position detecting module includes a circuit board, and the detecting component is disposed on the circuit board The circuit board is fixed to the housing from the outside of the housing, so that the detecting component passes through the second through hole to detect the detecting object. The color wheel module of claim 1, wherein the first portion has a one-sided surface, the week The mask has a first reflectivity, and the detecting object is fixed on the circumferential surface and has a detecting surface, and the detecting surface has a second reflectivity different from the first reflectivity. The color wheel module of claim 4, wherein the detecting component comprises a light source for emitting light to the circumferential surface and the detecting surface. The color wheel module of claim 1, wherein the detecting component comprises a magnetic sensor, the first portion has a one-sided surface, and the detecting object is a magnet. A motor for rotating a color wheel, the motor comprising: a housing having a substantially sealed receiving space and a first through hole, the first through hole communicating with the receiving space; a rotor rotating shaft comprising a first a portion and a second portion, the first portion is disposed in the accommodating space, the second portion protrudes from the first through hole in the housing, the color wheel is fixed on the second portion; and a position detecting module The detecting unit includes a detecting object and a detecting component, the detecting component includes an optical sensor, and the detecting component is disposed in the first In one part, the detecting component is mounted on the housing to enable the optical sensor to detect the detecting object. The motor of claim 7, wherein the detecting component is disposed in the accommodating space. The motor of claim 7, wherein the housing has a second through hole that communicates with the capacitor The position detecting module includes a circuit board, and the detecting component is disposed on the circuit board, and the circuit board is fixed on the housing from the outside of the housing, so that the detecting component passes through the second through hole To detect the detected object. The motor of claim 7, wherein the first portion has a one-sided surface, the peripheral mask has a first reflectivity, and the detecting object is fixed on the circumferential surface and has a detecting surface, the detecting surface has a The second reflectivity is different from the first reflectivity. The motor of claim 10, wherein the detecting component comprises a light source for emitting light onto the circumferential surface and the detecting surface. The motor of claim 7, wherein the detecting component comprises a magnetic sensor, the first portion has a one-sided surface, and the detecting object is a magnet. A projection device comprising: a motor, comprising: a housing having a substantially sealed receiving space and a through hole, the through hole communicating with the receiving space; and a rotor rotating shaft extending outwardly from the receiving space The through hole protrudes from the casing; and a rotation speed detecting module is disposed in the accommodating space, the module has a mark disposed on a circumferential surface of the rotor shaft, and an optical sensor is disposed on the The housing is configured to detect a rotational frequency of the marker; a color wheel fixed on one end of the rotor shaft protruding from the casing; a light source projecting a light beam penetrating a surface of the color wheel; and a controller electrically connecting the motor, according to the rotation speed detecting module The rotational frequency of the output controls the speed of the motor output.