TWM638493U - Optical module and projection device using the same - Google Patents

Abstract

The present application provides an optical module. The optical module cooperates with an optical path to realize the conversion of light. The optical module includes a color wheel, a first driving component and a second driving component. The color wheel includes at least two concentrically arranged color circles, and the color circle includes a plurality of color regions. The first driving component is drivingly connected with the color wheel. The first driving component is used for driving the color wheel to rotate, so that the different color divisions of the color circle are inserted into the light path in time. The second driving component is drivingly connected to the first driving component. The second driving component is used for driving the color wheel to move in the first direction, so that the concentrically arranged color circles are inserted into the light path in a time-divisional manner. The first direction intersects the extending direction of the optical path. The present application also provides a projection device using the optical module.

Description

Optical module and projection device using same

The present application relates to the field of optical display, in particular to an optical module and a projection device using the same.

With the continuous advancement of technology, laser projection devices are more and more appearing in people's home entertainment and work due to their advantages such as wide color gamut and high color purity. The color wheel can be used as a source of color for digital optical processing projectors. The light emitted by the light source is reflected by the digital micro-mirror element, and then passes through the color wheel to present different colors. Different application functions have different requirements on color. For example, drawing demonstration requires high brightness of the display screen, but not high requirements for color. For example, when it is used in home theater or rear projection TV, more attention is paid to display color. That is, for different application scenarios, there are different requirements for the color wheel. However, due to limitations such as the size of the color wheel itself and manufacturing costs, the applicability of the current color wheel and the performance of a single color wheel still need to be improved. How to solve the above-mentioned problems needs to be considered by those skilled in the art.

In order to solve the problems in the prior art, embodiments of the present application provide an optical module and a projection device using the same, which have higher applicability and better performance.

An embodiment of the present application provides an optical module, which is used to cooperate with an optical path for converting light. The optical module includes: a color wheel, including at least two concentrically arranged color circles, and the color circle includes A plurality of color zones; a first driving element, drivingly connected with the color wheel, the first driving element is used to drive the color wheel to rotate, so that different color zones of the color circle intervene in the Optical path; a second driving element, drivingly connected with the first driving element, the second driving element is used to drive the color wheel to move along the first direction, so that the concentrically arranged color circle intervenes in the The optical path, the first direction intersects the extending direction of the optical path.

In a possible implementation manner, multiple color circles are stacked, and projections of centers of multiple color circles along a rotation plane of the color wheel overlap.

In a possible implementation manner, the radii of the multiple color circles are different, and the multiple color circles are stacked in order of radius from small to large or from large to small.

In a possible implementation manner, the color circle is in the shape of a ring, and a plurality of the color circles are set around in order of their outer circle radii from small to large, and the color circle includes a sub-substrate and a The light conversion layer on the surface of the sub-substrate is used for converting light.

In a possible implementation manner, the sub-substrates of two adjacent color circles are bonded and fixed.

In a possible implementation manner, the sub-substrates of the plurality of color circles are integrally formed.

In a possible implementation manner, the first direction is perpendicular to the extending direction of the optical path.

In a possible implementation manner, the first driving element includes a rotary driving element and a rotational speed sensing element, the rotating driving element includes a fixed part and a rotating part, the rotating part rotates compared with the fixed part, and the The rotating part is connected to the color wheel for driving the color wheel to rotate, and the The fixing part is connected to the second driving element, the rotation speed sensing part is connected to the fixing part, and the sensing end of the rotation speed sensing part faces the color wheel for sensing the rotation speed of the color wheel.

In a possible implementation manner, the second drive element includes a linear drive element and an adapter plate, the adapter plate is fixedly connected to the first drive element, and the linear drive element and the adapter plate drive Connected, the linear driving part drives the color wheel to make reciprocating linear motion along the first direction through the adapter plate and the first driving element.

In a possible implementation manner, the linear driver includes a stepper motor, a transmission screw, a transmission nut and a transmission plate, the transmission plate is fixedly connected to the adapter plate, and the stepper motor is connected to the transmission screw transmission connection, the transmission nut is sleeved on the transmission screw and connected with the transmission screw, the transmission nut is fixed with the transmission plate, and the stepping motor is used to drive the transmission screw to rotate, so that The transmission nut drives the transmission plate to perform linear motion compared with the stepping motor.

In a possible implementation manner, the second driving element further includes a guide rod and a base, the stepping motor is fixedly connected to the base, the guide rod is fixedly connected to the base, the guide rod is connected to the base The transmission plate is slidably connected to guide the transmission plate.

In a possible implementation manner, the transmission plate includes a first transmission plate and a second transmission plate spaced apart, the first transmission plate is fixed to the transmission nut, and the first transmission plate is fixed to the guide rod. Slidingly connected, the second transmission plate is slidably connected to the guide rod, and the first transmission plate and the second transmission plate are fixed on the side of the adapter plate away from the color wheel.

In a possible implementation manner, the second driving element further includes a linear displacement sensing element and a measuring nut, the measuring nut is spaced apart from the driving screw, and the measuring nut and the driving nut are compared with the The transmission screw moves synchronously, and the linear displacement sensing part cooperates with the measuring nut to obtain the displacement of the driving nut along the first direction by sensing the displacement of the measuring nut along the first direction quantity.

In a possible implementation manner, the second driving element further includes a buffer, and the buffer is disposed between the adapter plate and the first driving element.

An embodiment of the present application further provides a projection device, including a light source and the aforementioned optical module, the light source forms the optical path, and the optical module is used to convert the light emitted by the light source.

Compared with the conventional technology, in the optical module of the present application, the color wheel includes multiple color circles, and each color circle can include multiple color zones. The first driving element drives the color wheel to rotate, and at the same time cooperates with the second driving element Drive the color wheel to movably intervene in the optical path along the first direction, so that each color circle and each color zone contained in it can intervene in the optical path in a time-sharing manner. Based on the imaging principle of this type of projection device, the optical model of the present application When the group is applied to a projection device, it can have more variations, so it has higher adaptability and better performance.

1: Optical module

10: Color wheel

101: color circle

102: color area

103: Main substrate

104: Sub-board

105: Light conversion layer

106: optical glue

107: center of circle

11: The first driving element

111: rotary drive

112: Speed sensor

113: fixed part

114: rotating part

115: sensing end

116: shell

117: turntable

12: Second drive element

120: Adapter board

121: Linear drive

122: Stepping motor

123: drive screw

124: drive nut

125: Transmission plate

1251: The first transmission sub-board

1252: The second transmission sub-board

126: guide rod

127: base

128: Measuring nut

129: Linear displacement sensor

130: Buffer

2: Projection device

21: light source

22: Optical path

X: first direction

A: Rotate the plane

FIG. 1 is a schematic perspective view of an optical module of the present application.

FIG. 2 is a schematic perspective view of another angle of the optical module of the present application.

FIG. 3 is an exploded perspective view of the optical module of the present application.

FIG. 4 is a schematic structural diagram of an embodiment of a color wheel of the optical module of the present application.

FIG. 5 is a schematic structural diagram of another embodiment of the color wheel of the optical module of the present application.

FIG. 6 is a schematic structural diagram of another embodiment of the color wheel of the optical module of the present application.

FIG. 7 is a partial perspective view of the optical module of the present application.

FIG. 8 is a partial perspective view of the optical module of the present application.

FIG. 9 is a partial perspective view of the optical module of the present application.

FIG. 10 is a schematic structural diagram of the projection device of the present application.

The following description will refer to the accompanying drawings to more fully describe the contents of the present application. Exemplary embodiments of the application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that this application will be thorough and complete, and will fully convey the scope of this application to those skilled in the art. Like reference numerals designate the same or similar components.

The terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to limit the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. Furthermore, as used herein, "comprises" and/or "comprises" or "comprises" and/or "comprises" or "has" and/or "has", integers, steps, operations, elements and/or elements , but does not exclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, elements and/or groups thereof.

Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. In addition, unless clearly defined herein, terms such as those defined in general dictionaries should be interpreted as having meanings consistent with their meanings in related technologies and the contents of this application, and will not be interpreted as idealized or overly formal.

The following content will describe exemplary embodiments with reference to the accompanying drawings. It should be noted that the elements depicted in the referenced drawings are not necessarily shown to scale; and the same or similar components will be given the same or similar reference numerals or similar technical terms.

The specific implementation manners of the present application will be further described in detail below with reference to the accompanying drawings.

As shown in FIGS. 1 to 10 , they are the optical module 1 of the present application and the projection device 2 using it. The embodiment of the present application provides an optical module 1, which is used to cooperate with an optical path 22 for converting light Change. The optical module 1 includes a color wheel 10 , a first driving element 11 and a second driving element 12 . The color wheel 10 includes at least two concentrically arranged color circles 101 , and the color circles 101 include a plurality of color zones 102 . The first driving element 11 is drivingly connected with the color wheel 10 , and the first driving element 11 is used to drive the color wheel 10 to rotate, so that different color zones 102 of the color circle 101 intervene in the optical path 22 in a time-sharing manner. The second driving element 12 is drivingly connected with the first driving element 11, and the second driving element 12 is used to drive the color wheel 10 to move along the first direction X, so that the concentrically arranged color circle 101 intervenes in the optical path 22 in a time-sharing manner. X intersects the extending direction of the optical path 22 .

Wherein, "concentrically arranged color circle 101" can be understood as the coaxial arrangement or overlapping of the circle center 107 corresponding to the ring where the multiple color circles 101 are located, and the axial direction of "coaxial" can be the extending direction of the optical path 22, so that multiple The circle centers 107 corresponding to the circles of the color circles 101 overlap on the rotation plane A; the circles where the multiple color circles 101 are located can correspond to different circles (the circle centers 107 corresponding to the multiple color circles 101 are coaxially arranged ), the rings where the multiple color circles 101 are located may correspond to the same circle (the centers 107 corresponding to the multiple color circles 101 overlap at this time).

Compared with the conventional technology, in the optical module 1 of the present application, the first driving element 11 drives the color wheel 10 to rotate, and at the same time cooperates with the second driving element 12 to drive the color wheel 10 to move along the first direction X to intervene in the optical path 22 , so that each color circle 101 and each color zone 102 in each color circle 101 can be time-divisionally inserted into the optical path 22. Based on the imaging principle of this type of projection device 2, the optical module 1 of the present application is used in projection When the device 2 can have more variations, it has higher adaptability and better performance.

Furthermore, the color wheel 10 is an optical structure that can change the brightness or color of light. For example, the color wheel 10 can be a transparent substrate with a filter layer or a fluorescent layer on its surface or a non-transparent substrate with its own color. The first driving element 11 can be a driving structure for outputting rotational torque, for example, the first driving element 11 can be a rotary motor; the second driving element 12 can be a driving structure for outputting linear motion, for example, the second driving element can be It is a linear motor, or the second driving element can be a stepper motor 122 with a screw.

In one embodiment, the color wheel 10 includes at least two concentrically arranged color circles 101. In the embodiment of the present application, two color circles 101 are used as an example to illustrate; it can be understood that the number of color circles 101 can also be three circles , four circles, five circles, etc., can expand the number of color circles 101 according to the information flow when the projection device used by the optical module 1 is played, and cooperate with the second drive element 12 to make the color wheel 10 have More ways of permutation and combination to obtain images with richer colors and/or brightness.

In this embodiment, the first direction X is perpendicular to the extending direction of the optical path 22 , that is, the optical path 22 is perpendicular to the rotation plane A of the color wheel 10 .

As shown in FIG. 4 , it is a schematic structural diagram of an embodiment of the color wheel 10 of the optical module 1 of the present application. In one embodiment, a plurality of color circles 101 are stacked, and the projections of the centers 107 of the plurality of color circles 101 along the rotation plane A of the color wheel 10 overlap, and the rings where the plurality of color circles 101 are located may correspond to different circles (here When the centers 107 corresponding to the multiple color circles 101 are coaxially arranged).

In one embodiment, the radii of the plurality of color circles 101 are different, and the plurality of color circles 101 are stacked in order of radius from small to large or from large to small.

In this embodiment, a plurality of color circles 101 are stacked along the direction perpendicular to the rotation plane A, and the plurality of color circles 101 are stacked in order of radius from small to large or from large to small. The inner circles of the multiple color circles 101 The radii are the same and the outer circle radii are different.

As shown in Figures 5 and 6, in one embodiment, the color circle 101 is in the shape of a ring, and a plurality of color circles 101 are arranged around them in order of their outer circle radii from small to large. The rings may correspond to the same circle (in this case, the centers 107 corresponding to the multiple color circles 101 overlap).

In this embodiment, a plurality of color circles 101 are arranged around a direction parallel to the rotation plane A, and the inner circle radius of the outer color circle 101 is greater than the outer circle radius of the inner color circle 101 among two adjacent color circles 101 .

As shown in FIG. 5 , it is a schematic structural diagram of another embodiment of the color wheel 10 of the optical module 1 of the present application. In one embodiment, the color circle 101 includes a sub-substrate 104 and the surface of the sub-substrate 104 The light conversion layer 105, the light conversion layer 105 is used to convert light, the sub-substrates 104 of two adjacent color circles 101 are bonded and fixed, and the sub-substrates 104 of two adjacent color circles 101 can be bonded by optical glue 106 , a plurality of sub-substrates 104 are sequentially spliced to form a main substrate 103 .

As shown in FIG. 6 , it is a schematic structural diagram of another embodiment of the color wheel 10 of the optical module 1 of the present application. In one embodiment, the color circle 101 includes a sub-substrate 104 and a light conversion layer 105 disposed on the surface of the sub-substrate 104 , the light conversion layer 105 is used to convert light, and the sub-substrates 104 of multiple color circles 101 are integrally formed. That is, the color wheel 10 includes a main substrate 103. The color wheel 10 is formed by coating different light conversion layers 105 on the surface of the main substrate 103 corresponding to different color regions 102. The main substrate 103 corresponds to different colors as a complete overall structure. The circle 101 divides a plurality of submounts 104 .

Further, the color wheel 10 in each embodiment of the present application can be provided with multi-circle color circles 101 according to the requirements of the product for color and brightness, and each color circle 101 can be divided into a plurality of color zones 102, and the shape of each color zone 102 , the geometric combination of multiple color zones 102, and the material or performance of each light conversion layer 105 can be changed and set according to actual needs.

In one embodiment, the first driving element 11 includes a rotating driving part 111 and a rotational speed sensing part 112 , the rotating driving part 111 includes a fixed part 113 and a rotating part 114 , and the rotating part 114 rotates compared to the fixed part 113 . The rotating part 114 is in drive connection with the color wheel 10 for driving the color wheel 10 to rotate, and the fixed part 113 is connected with the second driving element 12 . The rotational speed sensing element 112 is connected to the fixed part 113 , and the sensing end 115 of the rotational speed sensing element 112 faces the color wheel 10 for sensing the rotational speed of the color wheel 10 .

In this embodiment, the rotary drive member 111 is a rotary motor, the fixed part 113 includes at least a casing 116 of the rotary motor and a stator structure (not shown in the figure, which may include an electromagnetic coil) disposed in the body, and the rotating part 114 includes at least The mover module of the rotary electric machine (not shown in the figure, may include magnetic parts or magnetic conductive parts) and the turntable 117 connected to the mover structure. The color wheel 10 is fixedly connected with the turntable 117, and the turntable 117 is in transmission connection with the mover structure, and the stator structure cooperates with the mover structure to rotate the mover structure so that the turntable 117 drives the color wheel 10 to rotate.

In this embodiment, the rotational speed sensor 112 may be a rotational speed sensor, and the types of the rotational speed sensor include but not limited to magnetic-sensitive rotational speed sensors and laser rotational speed sensors. The rotational speed sensing part 112 is connected and fixed to the housing 116 , and the sensing end 115 of the rotational speed sensing part 112 is set towards the color wheel 10 , and the rotational speed sensing part 112 can measure the rotational speed of the color wheel 10 .

In one embodiment, the second driving element 12 includes a linear driving element 121 and an adapter plate 120 , and the adapter plate 120 is fixedly connected to the first driving element 11 . The linear driving part 121 is drivingly connected with the adapter plate 120 , and the linear driving part 121 drives the color wheel 10 to make a reciprocating linear motion along the first direction X through the adapter plate 120 and the first driving element 11 .

Further, the adapter plate 120 is fixedly connected to the fixing portion 113 of the first driving element 11 by a nut, the adapter plate 120 is arranged on the side of the fixing plate away from the turntable 117, and the second driving element 12 can be arranged on the side of the adapter plate 120 away from the turntable 117. On the side of the first driving element 11 , the first driving element 11 and the second driving element 12 are prevented from interfering with the color wheel 10 .

In one embodiment, the linear driving member 121 includes a stepping motor 122 , a driving screw 123 , a driving nut 124 and a driving plate 125 . The transmission plate 125 is fixedly connected with the adapter plate 120 , the stepper motor 122 is in transmission connection with the transmission screw 123 , the transmission nut 124 is sleeved on the transmission screw 123 and is in transmission connection with the transmission screw 123 , and the transmission nut 124 is fixed with the transmission plate 125 . The stepping motor 122 is used to drive the transmission screw 123 to rotate, so that the transmission nut 124 drives the transmission plate 125 to perform linear motion compared with the stepping motor 122 .

Further, the stepper motor 122 outputs a rotational torque to rotate the transmission screw 123, the outer surface of the transmission screw 123 can be provided with external threads (not shown), the transmission nut 124 is sleeved on the outer surface of the transmission screw 123, and the transmission screw 123 is provided with The external thread is matched with an internal thread (not shown in the figure), and the relative movement between the internal thread and the external thread converts the rotational torque output by the stepping motor 122 into a linear motion along the first direction X. The transmission plate 125 is fixedly connected with the transmission nut 124 , and the transmission nut 124 drives the transmission plate 125 to move linearly along the first direction X. The transmission plate 125 is located between the transmission screw 123 and the adapter plate 120, and the transmission plate 125 Drive the adapter plate 120 to move linearly along the first direction X. Therefore, only the adapter plate 120 of the linear driving member 121 can drive the first driving element 11 and the color wheel 10 to move linearly along the first direction X.

In one embodiment, the second driving element 12 also includes a guide rod 126 and a base 127, the stepper motor 122 is fixedly connected to the base 127, the guide rod 126 is fixedly connected to the base 127, the guide rod 126 is slidably connected to the transmission plate 125, and Used to guide the transmission plate 125 .

Furthermore, the base 127 can be used to connect the projection device 2, and the stepper motor 122 is fixed to the base 127 to output stable linear motion. The guide rod 126 is fixedly connected to the base 127, and the guide rod 126 and the transmission screw 123 can be arranged in parallel. movement precision.

In one embodiment, the transmission plate 125 includes a first transmission sub-board 1251 and a second transmission sub-board 1252 at intervals. The plate 1251 is fixed with the transmission nut 124, the first transmission sub-plate 1251 is slidably connected with the guide rod 126, the second transmission sub-plate 1252 is slidably connected with the guide rod 126, the first transmission sub-plate 1251 and the second transmission sub-plate 1252 are fixed on the rotary The connecting plate 120 is away from the side of the color wheel 10 .

Furthermore, the first transmission sub-plate 1251 and the second transmission sub-plate 1252 are arranged at intervals along the first direction X, so that the force on the transmission plate 125 is uniform, and it is less likely to shake or tilt during the movement, which improves the stability of the movement. The first transmission sub-board 1251 is mainly used to drive the adapter plate 120 to move along the first direction X, and the main function of the second transmission sub-board 1252 is to cooperate with the guide rod 126 to guide the transmission plate 125 .

In one embodiment, the second driving element 12 further includes a linear displacement sensor 129 and a measuring nut 128 , and the measuring nut 128 is spaced apart from the driving screw 123 . The measuring nut 128 and the driving nut 124 move synchronously compared with the driving screw 123, and the linear displacement sensor 129 cooperates with the measuring nut 128 to obtain the displacement of the driving nut 124 along the first direction X by sensing the displacement of the measuring nut 128 along the first direction X. The displacement in one direction X.

Further, the measuring nut 128 is sleeved on the transmission screw 123 and spaced apart from the transmission nut 124. The internal thread of the measurement nut 128 has the same parameters as the internal thread of the transmission nut 124, so that the measurement nut 128 and the transmission nut 124 can be compared with the transmission nut 124. The screw rods 123 move synchronously. The linear displacement sensor 129 can include a proximity sensor, a displacement sensor or a distance sensor, and the proximity sensor, displacement sensor or distance sensor can be connected by a flexible circuit board and a stepper motor 122 electrical connection. The linear displacement sensor 129 cooperates with the measuring nut 128 and senses its displacement distance. The measuring nut 128 moves synchronously with the driving nut 124, and the driving nut 124 drives the driving plate 125, the adapter plate 120 and the color wheel 10 to move synchronously with the measuring nut 128. The linear displacement sensing part 129 can obtain the motion parameter of the color wheel 10 along the first direction X.

In one embodiment, the second driving element 12 further includes a buffer 130 disposed between the adapter plate 120 and the first driving element 11 . In this embodiment, the buffer member 130 may be a rubber ring.

As shown in FIG. 10 , the embodiment of the present application also provides a projection device 2 , including a light source 21 and an optical module 1 . The light source 21 is used to emit light to form an optical path 22 , and the optical module 1 is used to convert the light emitted by the light source 21 . Wherein, the light emitted by the light source 21 can at least irradiate the color wheel 10, and the color wheel 10 rotates to realize image output.

Hereinbefore, specific embodiments of the present application have been described with reference to the accompanying drawings. However, those skilled in the art can understand that without departing from the spirit and scope of the present application, various changes and substitutions can be made to the specific embodiments of the present application. These changes and substitutions all fall within the scope defined by this application.

1: Optical module

10: Color wheel

111: rotary drive

112: Speed sensor

113: fixed part

115: sensing end

116: shell

12: Second drive element

120: Adapter board

Claims (15)

An optical module, which is used to cooperate with an optical path for converting light, the improvement is that the optical module includes: a color wheel, including at least two concentrically arranged color circles, and the color circles include multiple a color zone; a first driving element, connected to the color wheel, and the first driving element is used to drive the color wheel to rotate, so that different color zones of the color circle intervene in the optical path at different times The second driving element is drivingly connected with the first driving element, and the second driving element is used to drive the color wheel to move along the first direction, so that the concentrically arranged color circle intervenes in the An optical path, the first direction intersects the extending direction of the optical path. The optical module according to claim 1, wherein a plurality of the color circles are stacked, and the projections of the centers of the plurality of color circles along the rotation plane of the color wheel overlap. The optical module according to claim 2, wherein the radii of the multiple color circles are different, and the multiple color circles are stacked in order of radius from small to large or from large to small. The optical module according to claim 1, wherein the color circle is in the shape of a ring, and a plurality of the color circles are arranged in order of outer circle radius from small to large, and the color circle includes a sub-substrate and a light conversion layer arranged on the surface of the sub-substrate, the light conversion layer is used for converting light. The optical module according to claim 4, wherein the sub-substrates of two adjacent color circles are bonded and fixed. The optical module according to claim 4, wherein the sub-substrates of the plurality of color circles are integrally formed. The optical module according to claim 1, wherein the first direction is perpendicular to the extending direction of the optical path. The optical module according to claim 1, wherein the first driving element includes a rotating driving element and a rotational speed sensing element, the rotating driving element includes a fixed part and a rotating part, and the rotating part Compared with the rotation of the fixed part, the rotating part is connected to the color wheel for driving the rotation of the color wheel, the fixed part is connected to the second driving element, and the rotational speed sensing part is connected to the color wheel. connected to the fixing part, and the sensing end of the rotational speed sensing element faces the color wheel for sensing the rotational speed of the color wheel. The optical module according to claim 1, wherein the second drive element includes a linear drive element and an adapter plate, the adapter plate is fixedly connected to the first drive element, and the linear drive element is connected to the The adapter plate is driven and connected, and the linear drive member drives the color wheel to make a reciprocating linear motion along the first direction through the adapter plate and the first driving element. The optical module as described in claim 9, wherein the linear driver includes a stepping motor, a transmission screw, a transmission nut and a transmission plate, the transmission plate is fixedly connected to the adapter plate, and the stepping motor It is connected with the transmission screw, the transmission nut is sleeved on the transmission screw and connected with the transmission screw, the transmission nut is fixed with the transmission plate, and the stepping motor is used to drive the transmission The screw rotates, so that the transmission nut drives the transmission plate to perform linear motion compared with the stepping motor. The optical module according to claim 10, wherein the second drive element further includes a guide rod and a base, the stepping motor is fixedly connected to the base, the guide rod is fixedly connected to the base, and The guide rod is slidingly connected with the transmission plate for guiding the transmission plate. The optical module according to claim 11, wherein the transmission plate includes a first transmission plate and a second transmission plate spaced apart, the first transmission plate is fixed to the transmission nut, and the first transmission plate The second transmission plate is slidably connected with the guide rod, the second transmission plate is slidably connected with the guide rod, and the first transmission plate and the second transmission plate are fixed on the side of the adapter plate away from the color wheel. The optical module according to claim 10, wherein the second driving element further includes a linear displacement sensor and a measuring nut, the measuring nut is spaced apart from the driving screw, and the measuring nut is connected to the driving nut Compared to the synchronous movement of the drive screw, the linear displacement sensor A component cooperates with the measuring nut for obtaining the displacement of the drive nut along the first direction by sensing the displacement of the measuring nut along the first direction. The optical module according to claim 9, wherein the second driving element further includes a buffer, and the buffer is disposed between the adapter plate and the first driving element. A projection device, the improvement of which is that the projection device includes a light source and an optical module as described in any one of Claims 1 to 14, the light source forms the optical path, and the optical module is used to control the The light emitted by the light source is converted.

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