Lighting device

Abstract

The invention provides a lighting device. The lighting device comprises a projection device and an image capturing device, the projection device comprises a light emitting device used for generating a first light beam to irradiate an object to be measured and generating a second light beam different from the first light beam to irradiate the object to be measured; the optical shutter device is located on an optical path of the first light beam and the second light beam, and the optical shutter device comprises a first optical shutter located on a light incident surface of the optical shutter device; the second optical shutter is located on the light emitting surface of the optical shutter device, the first light beam penetrates through the optical shutter device and generates first structured light in a first depth-of-field range, and the second light beam penetrates through the optical shutter device and generates second structured light in a second depth-of-field range different from the first depth-of-field range. The first structured light and the second structured light are projected on the object to be measured to generate an image beam. The image capturing device is used for sensing the image light beam to obtain a first image and a second image.

Description

Technical Field

[0001] The present invention relates to a lighting device, and in particular to a lighting device capable of maintaining system brightness and increasing depth of field. Background Art

[0002] The basic principle of the oral scanner system is to generate structured light to illuminate the target object and collect the image light reflected by the target object (such as teeth) to build a 3D surface model of the target object. A good oral scanner can provide a large depth of field (DOF). When scanning the oral cavity, an oral scanner with a large depth of field can provide excellent images even for the roots or deep molars that are difficult for the front end of the oral scanner to approach, thereby maintaining the accuracy of the entire mouth.

[0003] In order to improve the depth of field (DOF) of the mouth scanner, the commonly used method includes changing the size of the lens aperture in the mouth scanner system. Since the deeper the depth of field, the smaller the lens aperture, the aperture size needs to be reduced in order to increase the depth of field. However, this method will sacrifice the overall light intensity, resulting in a decrease in resolution. Therefore, how to maintain system brightness and increase the depth of field (DOF) has always been an important issue in the field of mouth scanners. Summary of the invention

[0004] The invention provides an illumination device for simultaneously generating structured light with different depths of field.

[0005] A lighting device of the present invention comprises:

[0006] A projection device, comprising:

[0007] A light emitting device, used to generate a first light beam to illuminate an object to be tested, and to generate a second light beam different from the first light beam to illuminate the object to be tested;

[0008] An optical shutter device is located on the optical path of the first light beam and the second light beam, and the optical shutter device includes:

[0009] A first light shutter, located on a light incident surface of the light shutter device; and

[0010] A second optical shutter is located on the light-emitting surface of the optical shutter device,

[0011] wherein the first light beam passes through the optical shutter device to generate a first structured light within a first depth of field, and the second light beam passes through the optical shutter device to generate a second structured light within a second depth of field different from the first depth of field, and the first structured light and the second structured light are projected onto the object to be measured and reflected to generate a first image beam and a second image beam respectively; and

[0012] The imaging device is used to sense the first image beam and the second image beam to obtain the corresponding first image and second image respectively.

[0013] Preferably, the first light beam has a first wavelength and the second light beam has a second wavelength different from the first wavelength.

[0014] Preferably, the first light beam has a first polarization direction, and the second light beam has a second polarization direction perpendicular to the first polarization direction.

[0015] Preferably, the light incident surface and the light emitting surface of the optical shutter device are parallel to each other.

[0016] Preferably, the thickness of the shutter device is changed to adjust the depth of field of the first structured light and / or the second structured light.

[0017] Preferably, part of the first light beam passes through the first light gate, and the part of the first light beam completely passes through the second light gate.

[0018] Preferably, the second light beam completely passes through the first light gate, and part of the second light beam passes through the second light gate.

[0019] Preferably, the first light gate includes a first pattern and a second pattern that are arranged alternately with each other.

[0020] Wherein, when the first light beam irradiates the first light gate, the first light beam passes through the first pattern, and the first light beam does not pass through the second pattern;

[0021] When the second light beam irradiates the first light gate, the second light beam passes through the first pattern and the second pattern; or, the second light beam does not pass through the first pattern, but passes through the second pattern.

[0022] Preferably, the second light gate includes a third pattern and a fourth pattern that are arranged alternately with each other.

[0023] Wherein, when the first light beam irradiates the second light gate, the first light beam passes through the third pattern and the fourth pattern; or, the first light beam passes through the third pattern, and the first light beam does not pass through the fourth pattern;

[0024] When the second light beam irradiates the second light gate, the second light beam does not pass through the third pattern, and the second light beam passes through the fourth pattern.

[0025] Preferably, the imaging device includes a first image sensor and a second image sensor, the first image sensor is used to sense the first image light beam, and the second image sensor is used to sense the second image light beam.

[0026] Further preferably, the first image sensor and the second image sensor sense the first image beam and the second image beam simultaneously;

[0027] Alternatively, the first image sensor senses the first image light beam in a first time period, and the second image sensor senses the second image light beam in a second time period different from the first time period.

[0028] Preferably, the imaging device comprises an image sensor, and the image sensor senses the first image light beam in a first time period, and senses the second image light beam in a second time period different from the first time period.

[0029] Preferably, the imaging device comprises a lens,

[0030] The lens is a movable lens, and the movable lens moves forward and backward along the optical path to change the positions where the first image and the second image are projected on the imaging device;

[0031] Alternatively, the lens includes a zoom lens for changing the focal length of the lens;

[0032] Alternatively, the lens includes a light-transmitting movable flat lens, and the focal length of the lens is changed based on the insertion or removal of the movable flat lens in the light path along a propagation direction perpendicular to the light path, or the change of the thickness of the movable flat lens.

[0033] Compared with the prior art, by generating two light beams with different optical properties and two shutters at different positions, two images with different depths of field can be generated simultaneously. Therefore, the aperture inside the projection lens does not need to be reduced, and the depth of field of the system is increased while maintaining brightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of a lighting device according to an embodiment of the present invention.

[0035] Figure 2 is a schematic diagram of a lighting device according to an embodiment of the present invention.

[0036] Figure 3 is a schematic diagram of a light emitting device according to an embodiment of the present invention.

[0037] Figure 4 is a schematic diagram of a light emitting device according to an embodiment of the present invention.

[0038] Figure 5 is a schematic diagram of a light emitting device according to an embodiment of the present invention.

[0039] Fig. 6A , Figure 6B is a schematic diagram of a first optical shutter and a second optical shutter according to an embodiment of the present invention.

[0040] Fig. 7A , Figure 7B is a schematic diagram of a first optical shutter and a second optical shutter according to an embodiment of the present invention.

[0041] Fig. 8A , Figure 8B is a schematic diagram of a first optical shutter and a second optical shutter according to an embodiment of the present invention.

[0042] Fig. 9A , Fig. 9B is a schematic diagram of a first optical shutter and a second optical shutter according to an embodiment of the present invention.

[0043] Fig.10 is a schematic diagram of a lighting device according to an embodiment of the present invention.

[0044] Fig.11 is a schematic diagram of a lighting device according to an embodiment of the present invention.

[0045] Fig.12 is a schematic diagram of a lighting device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed description is given in conjunction with the embodiments.

[0047] Certain words are used in the specification and claims to refer to specific components. Those with ordinary knowledge in the field should understand that manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of the components as the criteria for distinction. The position descriptions such as up, down, top, and bottom mentioned in the specification are based on the directions marked in the drawings and the definition methods that people are accustomed to, to explain the positional relationship between the components, and do not limit the actual placement or use direction of the product. The "including" mentioned throughout the specification and claims is an open-ended term, so it should be interpreted as "including but not limited to".

[0048] Figure 1 Schematic diagram of an illumination device according to an embodiment of the present invention. The illumination device 10 comprises: a projection device 100 , an imaging device 200 , and a processor 300 .

[0049] The projection device 100 is used to generate a first light beam L1, and generates a first structured light SL1 within a first depth of field to illuminate an object to be measured S. The projection device 100 also generates a second light beam L2 having a different structure from the first light beam L1, and generates a second structured light SL2 within a second depth of field different from the first depth of field. The first structured light SL1 and the second structured light SL2 are projected onto the object to be measured S. The specific structure of the projection device 100 will be described below.

[0050] The first structured light SL1 and the second structured light SL2 emitted by the projection device 100 enter the projection mirror M through the projection path LP1, and are reflected by the projection mirror M and projected onto the object to be measured S. In some embodiments, the projection mirror M may be a reflector, or an optical element with a metal reflective coating, or other similar functions, and the present disclosure is not limited thereto. In some embodiments, the object to be measured S is a tooth.

[0051] When the first structured light SL1 and the second structured light SL2 are projected onto the object S, they are reflected by the object S to form the first image beam IL1 and the second image beam IL2. The first image beam IL1 and the second image beam IL2 enter the projection mirror M and are reflected by the projection mirror M before entering the imaging device 200 along the sensing path LP2.

[0052] The imaging device 200 is used to sense the first image beam IL1 and the second image beam IL2 to obtain a first image corresponding to the first image beam IL1 and a second image corresponding to the second image beam IL2. Specifically, the imaging device 200 receives the first image beam IL1 and the second image beam IL2 of the object S on the sensing path, and the processor 300 processes them to generate the first image and the second image. The specific structure of the imaging device 200 will be described below.

[0053] The processor 300 is coupled to the imaging device 200, and is used to analyze the first image beam IL1 and the second image beam IL2 of the object to be measured S, and obtain the first image and the second image respectively, wherein the first image corresponds to the first image beam IL1 of the object to be measured S, and the second image corresponds to the second image beam IL2 of the object to be measured S. In some embodiments, the processor 300 may include a calculator, a microprocessor (MCU), a central processing unit (CPU), or other programmable controllers (Microprocessor), digital signal processors (DSP), programmable controllers, application specific integrated circuits (ASIC), programmable logic devices (PLD) or other similar devices.

[0054] Figure 2 is a schematic diagram of a lighting device according to an embodiment of the present invention. Figure 1 The components in Figure 2 Please refer to Figure 2 The lighting device 10A is Figure 1 An embodiment of the lighting device 10 is shown in FIG. 1. The lighting device 10A includes a projection device 100 and an imaging device 200A.

[0055] The projection device 100 includes a light emitting device 110 , a shutter device 120 and a projection lens assembly 130 .

[0056] The light emitting device 110 is used to generate a first light beam L1 to illuminate the object to be tested S, and to generate a second light beam L2 different from the first light beam L1 to illuminate the object to be tested S. Figure 3 and Figure 4 Some embodiments of the light emitting device 110 are described.

[0057] Figure 3 is a schematic diagram of a light source according to an embodiment of the present invention. Figure 3 The light emitting device 110A shown is Figure 2 An embodiment of the light emitting device 110. Figure 3As shown, the light emitting device 110A includes a light source 112A for generating a light beam L. In some embodiments, the light source 112A may be a light emitting diode, a milli-light emitting diode (Mini LED), a micro-light emitting diode (MicroLED), an organic light emitting diode, a laser diode, or other suitable light emitting elements, but the present disclosure is not limited thereto. In some embodiments, the light beam L may be a single color light with multiple polarization directions, for example, the light beam L may be one of infrared light, red light, green light, blue light, near ultraviolet light, or ultraviolet light with two mutually perpendicular polarization directions, but the present disclosure is not limited thereto. The light beam L may also be a light beam having a mixture of two different color lights, for example, the light beam L may include any two light beams of infrared light, red light, green light, blue light, near ultraviolet light, or ultraviolet light, but the present disclosure is not limited thereto.

[0058] After being emitted by the light source 112A, the light beam L enters the beam splitter 114A of the light emitting device 110. The beam splitter 114A splits the light beam L into a first light beam L1 and a second light beam L2.

[0059] The first light beam L1 is reflected by the beam splitter 114A, and then is reflected by the first reflector M1, and then enters the first filter 116A1. In some embodiments, the first filter 116A1 can be configured to allow the first light beam L1 having specific optical characteristics to pass through. The first light beam L1 that passes through the first filter 116A1 is reflected by the second reflector M2 and then enters the light combining element 118. In some embodiments, the first light beam L1 can also enter the first filter 116A1 and the light combining element 118 in different ways, and one or both of the first reflector M1 and the second reflector M2 can be omitted, or other optical elements that can change the light path can be added, but the present disclosure is not limited to this.

[0060] After passing through the beam splitter 114A, the second light beam L2 enters the second filter 116A2. In some embodiments, the second filter 116A2 can allow the second light beam L2 having specific optical characteristics to pass through. The second light beam L2 passing through the second filter 116A2 is reflected by the second reflector M2 and then enters the light combining element 118.

[0061] After the first light beam L1 is reflected by the light combining element 118, it has the same optical path as the second light beam L2 that is transmitted through the light combining element 118. The first light beam L1 and the second light beam L2 are incident along the common optical path. Figure 2 The shutter device 120 is shown.

[0062] In some embodiments, the light beam L may be a single color light having a plurality of polarization directions perpendicular to the optical path direction. In some embodiments, the light beam L may be one of infrared light, red light, green light, blue light, near ultraviolet light or ultraviolet light, but the present disclosure is not limited thereto. In this case, the first filter 116A1 and the second filter 116A2 may be polarizers, so that the first light beam L1 passing through the first filter 116A1 has a first polarization direction, and the second light beam L2 passing through the second filter 116A2 has a second polarization direction perpendicular to the first polarization direction. In some embodiments, the angle between the first polarization direction and the second polarization direction ranges from 80 degrees to 100 degrees, preferably from 85 degrees to 95 degrees. The angle between the first polarization direction and the second polarization direction within the above angle range can be regarded as the first polarization direction being perpendicular to the second polarization direction, but the present disclosure is not limited thereto.

[0063] In some embodiments, the light beam L may be a light beam formed by light beams having two different polarization directions. For example, in some embodiments, the light beam L may be a light beam having a vertical polarization direction and a light beam having a horizontal polarization direction. In this case, the first filter 116A1 may be a filter that allows a light beam having a vertical polarization direction to pass through, so that the first light beam L1 forms a light beam having a vertical polarization direction. The second filter 116A2 may be a filter that allows a light beam having a horizontal polarization direction to pass through, so that the second light beam L2 forms a light beam having a horizontal polarization direction. Therefore, the first light beam L1 passing through the second filter 116A2 has a first polarization direction, such as a vertical polarization direction, and the second light beam L2 passing through the second filter 116A2 has a second polarization direction different from the first polarization direction, such as a horizontal polarization direction.

[0064] In some embodiments, the light beam L may be a light beam formed by two different colored lights. For example, in some embodiments, the light beam L may be formed by blue light and red light. In this case, the first filter 116A1 may be a red light filter that allows blue light to pass through and blocks red light, so that the first light beam L1 forms blue light. The second filter 116A2 may be a blue light filter that allows red light to pass through and blocks blue light, so that the second light beam L2 forms red light. In other embodiments, the light beam L may be formed by blue light and green light. In this case, the first filter 116A1 may be a green light filter that allows blue light to pass through and blocks green light, so that the first light beam L1 forms blue light. The second filter 116A2 may be a blue light filter that allows green light to pass through and blocks blue light, so that the second light beam L2 forms green light. Therefore, the first light beam L1 passing through the second filter 116A2 has a first wavelength, and the second light beam L2 passing through the second filter 116A2 has a second wavelength different from the first wavelength.

[0065] Figure 4 is a schematic diagram of a light source according to an embodiment of the present invention. Figure 4 The light emitting device 110B shown is Figure 2 An embodiment of the light emitting device 110. Figure 4 As shown, the light emitting device 110B includes a first light source 112B1 and a second light source 112B2. The first light source 112B1 is used to generate a first light beam L1, and the second light source 112B2 is used to generate a second light beam L2. In some embodiments, the first light source 112B1 and the second light source 112B2 may be light emitting diodes, mini LEDs, micro LEDs, organic light emitting diodes, laser diodes, or other suitable light emitting elements, but the present disclosure is not limited thereto.

[0066] In some embodiments, the first light beam L1 has a first polarization direction, and the second light beam L2 has a second polarization direction perpendicular to the first polarization direction. For example, the first polarization direction may be a vertical polarization direction, and the second polarization direction may be a horizontal polarization direction, but the present disclosure is not limited thereto.

[0067] In some embodiments, the first light beam L1 has a first wavelength, and the second light beam L2 has a second wavelength different from the first wavelength. For example, the first light beam L1 may be one of infrared light, red light, green light, blue light, near ultraviolet light, or ultraviolet light, and the second light beam L2 may be another one of infrared light, red light, green light, blue light, near ultraviolet light, or ultraviolet light different from the first light beam L1. For example, the first light beam L1 may be blue light, and the second light beam L2 may be red light or green light, but the present disclosure is not limited thereto.

[0068] After the first light source 112B1 emits the first light beam L1, the first light beam L1 is incident on the light combining element 118. After the second light source 112B2 emits the second light beam L2, the second light beam L2 is incident on the light combining element 118.

[0069] After the first light beam L1 is reflected by the light combining element 118, it has the same optical path as the second light beam L2 that is transmitted through the light combining element 118. The first light beam L1 and the second light beam L2 are incident along the same optical path. Figure 2 The shutter device 120 is shown.

[0070] In this embodiment, the first light source 112B1 and the second light source 112B2 are located outside the light combining element 118. In another embodiment, the first light source 112B1 and the second light source 112B2 can be combined with the light combining element 118 to reduce energy loss caused when the first light beam L1 and the second light beam L2 enter the light combining element 118 and shorten the optical path.

[0071] Figure 5 is a schematic diagram of a light source according to an embodiment of the present invention. Figure 5 The light emitting device 110C shown is Figure 2An embodiment of the light emitting device 110. Figure 5 As shown, the light emitting device 110C includes a first light source 112C1 and a second light source 112C2. The first light source 112C1 is used to generate a first light beam L1, and the second light source 112C2 is used to generate a second light beam L2. In some embodiments, the first light source 112C1 and the second light source 112C2 may be light emitting diodes, mini LEDs, micro LEDs, organic light emitting diodes, laser diodes, or other suitable light emitting elements, but the present disclosure is not limited thereto.

[0072] In this embodiment, the first light source 112C1 and the second light source 112C2 are located on the same side, so the first light beam L1 and the second light beam L2 emitted have the same light path. Figure 3 As shown in the light emitting device 110B, a light combining element 118 is required to combine the first light beam L1 and the second light beam L2 to achieve the effect of reducing the volume of the system.

[0073] Please refer again Figure 2 After the light emitting device 110 emits the first light beam L1 and the second light beam L2 , the first light beam L1 and the second light beam L2 enter the shutter device 120 after passing through the lens 119 .

[0074] The shutter device 120 is located on the optical path of the first light beam L1 and the second light beam L2. In some embodiments, the shutter device 120 is a transparent optical element, which allows the first light beam L1 and the second light beam L2 to pass through, and patterns the first light beam L1 and the second light beam L2 respectively to form the first structured light SL1 and the second structured light SL2. In some embodiments, the shutter device 120 can be glass or other materials with similar properties, and the present disclosure is not limited thereto. Figure 2 As shown, the shutter device 120 has a thickness d. The thickness d of the shutter device 120 can cause the first structured light SL1 and the second structured light SL2 to produce different depths of field. In one embodiment, the thickness d of the shutter device 120 is variable, so as to adjust the depth of field of the first structured light SL1 and / or the second structured light SL2, so the thickness d needs to be within a certain range. If the thickness d is too small, the depth of field difference of the image produced by the first structured light SL1 and the second structured light SL2 is not obvious. Or if the thickness d is too large, the first light beam L1 and the second light beam L2 will lose energy in the shutter device 120, resulting in a decrease in resolution. In some embodiments, the thickness d of the shutter device 120 is 0.5 mm-2 mm, but the present disclosure is not limited thereto.

[0075] like Figure 2As shown, the optical shutter device 120 includes a first optical shutter 122 and a second optical shutter 124. The first optical shutter 122 is located on the light incident surface of the optical shutter device 120. The second optical shutter 124 is located on the light exit surface of the optical shutter device 120. In some embodiments, the first optical shutter 122 and the second optical shutter 124 may be an integrally formed structure. In some embodiments, the first optical shutter 122 and the second optical shutter 124 may be independent of each other, based on the fact that the two are respectively installed in the mounting bracket of the optical shutter device 120 to form the optical shutter device 120 together. At this time, the thickness d of the optical shutter device 120 can also be adjusted by changing the position and / or distance between the first optical shutter 122 and the second optical shutter 124. In some embodiments, the light incident surface and the light exit surface of the optical shutter device 120 are parallel to each other. Therefore, the first optical shutter 122 located on the light incident surface of the optical shutter device 120 and the second optical shutter 124 located on the light exit surface of the optical shutter device 120 are also parallel to each other. In addition, the light entrance surface and the light exit surface of the shutter device 120 are perpendicular to the optical paths of the first light beam L1 and the second light beam L2. Therefore, the first shutter 122 located on the light entrance surface of the shutter device 120 and the second shutter 124 located on the light exit surface of the shutter device 120 are also perpendicular to the optical paths of the first light beam L1 and the second light beam L2.

[0076] After passing through the shutter device 120 , the first light beam L1 and the second light beam L2 are patterned by the shutter device 120 to form a first structured light SL1 and a second structured light SL2 . The process of patterning the first light beam L1 and the second light beam L2 is described below.

[0077] Fig. 6A , Figure 6B 1 is a schematic diagram of a first optical shutter and a second optical shutter according to an embodiment of the present invention. The first optical shutter 122A is Figure 2 An embodiment of the first optical shutter 122 in FIG. The second optical shutter 124A is Figure 2 An embodiment of the second optical shutter 124.

[0078] Please also refer to Figure 2 , Fig. 6A and Figure 6B When the first light beam L1 and the second light beam L2 enter the optical shutter device 120 , the first light beam L1 passes through the first optical shutter 122A and the second optical shutter 124A in sequence, and the second light beam L2 passes through the first optical shutter 122A and the second optical shutter 124A in sequence.

[0079] A portion of the first light beam L1 passes through the first light gate 122 , and a portion of the first light beam L1 (ie, the portion passing through the first light gate 122 ) completely passes through the second light gate 124 . The second light beam L2 completely passes through the first light gate 122 , and a portion of the second light beam L2 passes through the second light gate 124 .

[0080] Specifically, when the first light beam L1 passes through the first light gate 122A, the first light gate 122A patterns the first light beam L1, that is, a portion of the first light beam L1 passes through the first light gate 122A, and another portion of the first light beam L1 is blocked by the first light gate 122A. When the first light beam L1 passing through the first light gate 122A enters the second light gate 124A, the second light gate 124A is transparent relative to the first light beam L1, so the first light beam L1 can completely pass through the second light gate 124A, and thus the patterning of the first light beam L1 by the first light gate 122A can be retained.

[0081] On the other hand, when the second light beam L2 enters the first light gate 122A, the first light gate 122A is transparent to the second light beam L2, so the second light beam L2 can completely pass through the first light gate 122A. When the second light beam L2 continues to enter the second light gate 124A, the second light gate 124A patterns the second light beam L2, that is, part of the second light beam L2 passes through the second light gate 124A, and another part of the second light beam L2 is blocked by the second light gate 124A.

[0082] Specifically, if Fig. 6A As shown, the first light shutter 122A includes a first pattern 122A1 and a second pattern 122A2. The first pattern 122A1 includes a plurality of rectangles, and the second pattern 122A2 includes a plurality of rectangles. The plurality of rectangles of the first pattern 122A1 and the plurality of rectangles of the second pattern 122A2 are arranged alternately. Preferably, the first pattern 122A1 and the second pattern 122A2 completely cover the light incident surface of the light shutter device 120. In some embodiments, the rectangles of the first pattern 122A1 and the rectangles of the second pattern 122A2 are the same size. In some embodiments, the rectangles of the first pattern 122A1 and the rectangles of the second pattern 122A2 are different in size.

[0083] In this embodiment, the first pattern 122A1 is composed of a material that allows the first light beam L1 to pass through and allows the second light beam L2 to pass through. The second pattern 122A2 is composed of a material that blocks the first light beam L1 from passing through and allows the second light beam L2 to pass through. In some embodiments, the first light beam L1 has a first polarization direction, and the second light beam L2 has a second polarization direction perpendicular to the first polarization direction, for example, the first light beam L1 has a vertical polarization direction, and the second light beam L2 has a horizontal polarization direction. The first pattern 122A1 may be a cavity without any material, and the second pattern 122A2 may be a material that allows a light beam with a horizontal polarization direction to pass through and blocks a light beam with a vertical polarization direction from passing through. In some embodiments, the first light beam L1 has a first wavelength, and the second light beam L2 has a second wavelength different from the first wavelength, for example, the first light beam L1 is blue light, and the second light beam L2 is red light or green light. The first pattern 122A1 may be a cavity without any material, and the second pattern 122A2 may be a material that allows the second light beam with a second wavelength to pass through and blocks the first light beam with a first wavelength from passing through, for example, a blue light filter.

[0084] In some embodiments, the second pattern 122A2 can absorb the first light beam L1 or reflect the first light beam L1. Therefore, when the first light beam L1 irradiates the first light gate 122A, the first light beam L1 passes through the first pattern 122A1, and the first light beam L1 does not pass through the second pattern 122A2. When the second light beam L2 irradiates the first light gate 122A, the second light beam L2 passes through the first pattern 122A1 and the second pattern 122A2.

[0085] like Figure 6B As shown, the second light shutter 124A includes a third pattern 124A1 and a fourth pattern 124A2. The third pattern 124A1 includes a plurality of rectangles, and the fourth pattern 124A2 includes a plurality of rectangles. The plurality of rectangles of the third pattern 124A1 and the plurality of rectangles of the fourth pattern 124A2 are arranged alternately. Preferably, the third pattern 124A1 and the fourth pattern 124A2 completely cover the light exit surface of the light shutter device 120. In some embodiments, the rectangles of the first pattern 122A1 and the rectangles of the second pattern 122A2 are the same size. In some embodiments, the rectangles of the first pattern 122A1 and the rectangles of the second pattern 122A2 are different in size.

[0086] In this embodiment, the third pattern 124A1 is made of a material that allows the first light beam L1 to pass through and blocks the second light beam L2 from passing through. The fourth pattern 124A2 is made of a material that allows the first light beam L1 to pass through and blocks the second light beam L2 from passing through. In some embodiments, the first light beam L1 has a first polarization direction, and the second light beam L2 has a second polarization direction perpendicular to the first polarization direction, for example, the first light beam L1 has a vertical polarization direction, and the second light beam L2 has a horizontal polarization direction. The third pattern 124A1 may be a material that allows a light beam in a vertical polarization direction to pass through and blocks a light beam in a horizontal polarization direction from passing through, and the fourth pattern 124A2 may be a cavity without any material. In some embodiments, the first light beam L1 has a first wavelength, and the second light beam L2 has a second wavelength different from the first wavelength, for example, the first light beam L1 is blue light, and the second light beam L2 is red light or green light. The third pattern 124A1 may be a material that allows the first light beam having the first wavelength to pass through and blocks the second light beam having the second wavelength from passing through, for example, a red light filter or a green light filter. The fourth pattern 124A2 may be a cavity without any material.

[0087] In some embodiments, the third pattern 124A1 can absorb the second light beam L2 or reflect the second light beam L2. Therefore, when the first light beam L1 irradiates the second light gate 124A, the first light beam L1 passes through the third pattern 124A1 and the fourth pattern 124A2. When the second light beam L2 irradiates the first light gate 122A, the second light beam L2 does not pass through the third pattern 124A1, but passes through the fourth pattern 124A2.

[0088] Therefore, when the first light beam L1 and the second light beam L2 enter the optical shutter device 120A, the first light beam L1 is patterned by the first optical shutter 122A, and the second light beam L2 is patterned by the second optical shutter 124A. Specifically, the first light beam L1 is patterned by the first pattern 122A1 of the first optical shutter 122A, and the second light beam L2 is patterned by the fourth pattern 124A2 of the second optical shutter 124A. The first light beam L1 is patterned by a optical shutter to form a first structured light SL1, and the second light beam L2 is patterned by a optical shutter to form a second structured light SL2.

[0089] In some embodiments, the first shutter 122A and the second shutter 124A have different patterns. For example, the first pattern 122A1 of the first shutter 122A and the third pattern 124A1 of the second shutter 124A have different patterns, and the second pattern 122A2 of the first shutter 122A and the fourth pattern 124A2 of the second shutter 124A have different patterns.

[0090] In some embodiments, the first shutter 122A and the second shutter 124A have the same pattern, for example, the first pattern 122A1 of the first shutter 122A and the third pattern 124A1 of the second shutter 124A have the same pattern, and the second pattern 122A2 of the first shutter 122A and the fourth pattern 124A2 of the second shutter 124A have the same pattern.

[0091] Fig. 7A , Figure 7B 1 is a schematic diagram of another first optical shutter and a second optical shutter according to an embodiment of the present invention. The first optical shutter 122B is Figure 2 An embodiment of the first optical shutter 122 in FIG. The second optical shutter 124B is Figure 2 An embodiment of the second optical shutter 124.

[0092] Please also refer to Figure 2 , Fig. 7A and Figure 7B When the first light beam L1 and the second light beam L2 enter the optical shutter device 120 , the first light beam L1 passes through the first optical shutter 122B and the second optical shutter 124B in sequence, and the second light beam L2 passes through the first optical shutter 122B and the second optical shutter 124B in sequence.

[0093] A portion of the first light beam L1 passes through the first light gate 122B, and another portion of the first light beam L1 (i.e., the portion that passes through the first light gate 122) passes through the second light gate 124B. The second light beam L2 completely passes through the first light gate 122B, and a portion of the second light beam L2 passes through the second light gate 124B. In other words, relative to Fig. 6A and Figure 6B ,exist Figure 7B In the embodiment, the first light beam L1 only partially passes through the second light gate 124B.

[0094] Specifically, when the first light beam L1 passes through the first light gate 122B, the first light gate 122B patterns the first light beam L1, that is, part of the first light beam L1 passes through the first light gate 122B, and another part of the first light beam L1 is blocked by the first light gate 122B. When the first light beam L1 passing through the first light gate 122B enters the second light gate 124B, another part of the first light beam L1 passing through the first light gate 122B is blocked by the second light gate 124B, so that the first light beam L1 is patterned again in the second light gate 124B.

[0095] On the other hand, the second light beam L2 is patterned only in the second light gate 124B.

[0096] Specifically, if Fig. 7AAs shown, the first light gate 122B includes a first pattern 122B1 and a second pattern 122B2. The first pattern 122B1 includes a plurality of rectangles, and the second pattern 122B2 includes a plurality of rectangles. The plurality of rectangles of the first pattern 122B1 and the plurality of rectangles of the second pattern 122B2 are arranged alternately. In some embodiments, the rectangles of the first pattern 122B1 and the rectangles of the second pattern 122B2 are the same size. In some embodiments, the rectangles of the first pattern 122B1 and the rectangles of the second pattern 122B2 are different in size.

[0097] In this embodiment, the first pattern 122B1 is composed of a material that allows the first light beam L1 to pass through and allows the second light beam L2 to pass through. The second pattern 122B2 is composed of a material that blocks the first light beam L1 from passing through and allows the second light beam L2 to pass through. In some embodiments, the first light beam L1 has a first polarization direction, and the second light beam L2 has a second polarization direction perpendicular to the first polarization direction, for example, the first light beam L1 has a vertical polarization direction, and the second light beam L2 has a horizontal polarization direction. The first pattern 122B1 may be a cavity without any material, and the second pattern 122B2 may be a material that allows a light beam with a horizontal polarization direction to pass through and blocks a light beam with a vertical polarization direction from passing through. In some embodiments, the first light beam L1 has a first wavelength, and the second light beam L2 has a second wavelength different from the first wavelength, for example, the first light beam L1 is blue light, and the second light beam L2 is red light or green light. The first pattern 122B1 may be a cavity without any material, and the second pattern 122B2 may be a material that allows the second light beam with a second wavelength to pass through and blocks the first light beam with a first wavelength from passing through, for example, a blue light filter.

[0098] In some embodiments, the second pattern 122B2 can absorb the first light beam L1 or reflect the first light beam L1. Therefore, when the first light beam L1 irradiates the first light gate 122B, the first light beam L1 passes through the first pattern 122B1, and the first light beam L1 does not pass through the second pattern 122B2. When the second light beam L2 irradiates the first light gate 122B, the second light beam L2 passes through the first pattern 122B1 and the second pattern 122B2.

[0099] like Figure 7B As shown, the second light gate 124B includes a third pattern 124B1 and a fourth pattern 124B2. The third pattern 124B1 includes a plurality of rectangles, and the fourth pattern 124B2 includes a plurality of rectangles. The plurality of rectangles of the third pattern 124B1 and the plurality of rectangles of the fourth pattern 124B2 are arranged alternately. In some embodiments, the rectangles of the third pattern 124B1 and the rectangles of the fourth pattern 124B2 are the same size. In some embodiments, the rectangles of the third pattern 124B1 and the rectangles of the fourth pattern 124B2 are different in size.

[0100] In this embodiment, the third pattern 124B1 is made of a material that allows the first light beam L1 to pass through and blocks the second light beam L2 from passing through. The fourth pattern 124B2 is made of a material that blocks the first light beam L1 from passing through and allows the second light beam L2 to pass through. In some embodiments, the first light beam L1 has a first polarization direction, and the second light beam L2 has a second polarization direction perpendicular to the first polarization direction, for example, the first light beam L1 has a vertical polarization direction, and the second light beam L2 has a horizontal polarization direction. The third pattern 124B1 may be a material that allows a light beam in a vertical polarization direction to pass through and blocks a light beam in a horizontal polarization direction from passing through, and the fourth pattern 124B2 may be a material that allows a light beam in a horizontal polarization direction to pass through and blocks a light beam in a vertical polarization direction from passing through. In some embodiments, the first light beam L1 has a first wavelength, and the second light beam L2 has a second wavelength different from the first wavelength, for example, the first light beam L1 is blue light, and the second light beam L2 is red light or green light. The third pattern 124B1 may be a material that allows the first light beam having the first wavelength to pass through and blocks the second light beam having the second wavelength from passing through, for example, a red light filter or a green light filter. The fourth pattern 124B2 may be made of a material that allows the second light beam with the second wavelength to pass through but blocks the first light beam with the first wavelength from passing through, such as a blue light filter.

[0101] In some embodiments, the third pattern 124B1 may absorb the second light beam L2 or reflect the second light beam L2, and the fourth pattern 124B2 may absorb the first light beam L1 or reflect the first light beam L1. Therefore, when the first light beam L1 irradiates the second light gate 124B, the first light beam L1 passes through the third pattern 124B1, and the first light beam L1 does not pass through the fourth pattern 124B2. When the second light beam L2 irradiates the second light gate 124B, the second light beam L2 does not pass through the third pattern 124B1, and the second light beam L2 passes through the fourth pattern 124B2.

[0102] Therefore, when the first light beam L1 and the second light beam L2 enter the optical shutter device 120B, the first light beam L1 is patterned by the first optical shutter 122B and the second optical shutter 124B, and the second light beam L2 is patterned by the second optical shutter 124B. Specifically, the first light beam L1 is patterned by the first pattern 122B1 of the first optical shutter 122B and the third pattern 124B1 of the second optical shutter 124B, and the second light beam L2 is patterned by the fourth pattern 124B2 of the second optical shutter 124B. The first light beam L1 is patterned by two optical shutters to form a first structured light SL1, and the second light beam L2 is patterned by one optical shutter to form a second structured light SL2.

[0103] In some embodiments, the first shutter 122B and the second shutter 124B have different patterns. For example, the first pattern 122B1 of the first shutter 122B and the third pattern 124B1 of the second shutter 124B have different patterns, and the second pattern 122B2 of the first shutter 122B and the fourth pattern 124B2 of the second shutter 124B have different patterns.

[0104] In some embodiments, the first shutter 122B and the second shutter 124B have the same pattern, for example, the first pattern 122B1 of the first shutter 122B and the third pattern 124B1 of the second shutter 124B have the same pattern, and the second pattern 122B2 of the first shutter 122B and the fourth pattern 124B2 of the second shutter 124B have the same pattern.

[0105] Fig. 8A , Figure 8B 122C is a schematic diagram of another first optical shutter and a second optical shutter according to an embodiment of the present invention. Figure 2 An embodiment of the first optical shutter 122 in FIG. The second optical shutter 124C is Figure 2 An embodiment of the second optical shutter 124.

[0106] Please also refer to Figure 2 , Fig. 8A and Figure 8B When the first light beam L1 and the second light beam L2 enter the optical shutter device 120 , the first light beam L1 passes through the first optical shutter 122C and the second optical shutter 124C in sequence, and the second light beam L2 passes through the first optical shutter 122C and the second optical shutter 124C in sequence.

[0107] Part of the first light beam L1 passes through the first light gate 122C, and part of the first light beam L1 (i.e., the part that passes through the first light gate 122) completely passes through the second light gate 124. Part of the second light beam L2 passes through the first light gate 122C, and another part of the second light beam L2 (i.e., the part that passes through the first light gate 122C) passes through the second light gate 124C. In other words, relative to Fig. 6A and Figure 6B ,exist Fig. 8A In the embodiment, the second light beam L2 only partially passes through the first light gate 122C.

[0108] Specifically, when the first light beam L1 passes through the first light gate 122C, the first light gate 122C patterns the first light beam L1, that is, part of the first light beam L1 passes through the first light gate 122C, and another part of the first light beam L1 is blocked by the first light gate 122C. When the first light beam L1 passing through the first light gate 122C enters the second light gate 124C, the second light gate 124C is transparent to the first light beam L1, so the first light beam L1 can completely pass through the second light gate 124C, and thus the patterning of the first light beam L1 by the first light gate 122C can be retained.

[0109] On the other hand, when the second light beam L2 passes through the first light gate 122C, the first light gate 122C patterns the second light beam L2, that is, part of the second light beam L2 passes through the first light gate 122C, and another part of the second light beam L2 is blocked by the first light gate 122C. When the second light beam L2 passing through the first light gate 122C enters the second light gate 124C, another part of the second light beam L2 passing through the first light gate 122C is blocked by the second light gate 124C, so that the second light beam L2 is patterned again in the second light gate 124C.

[0110] Specifically, if Fig. 8A As shown, the first light gate 122C includes a first pattern 122C1 and a second pattern 122C2. The first pattern 122C1 includes a plurality of rectangles, and the second pattern 122C2 includes a plurality of rectangles. The plurality of rectangles of the first pattern 122C1 and the plurality of rectangles of the second pattern 122C2 are arranged alternately. In some embodiments, the rectangles of the first pattern 122C1 and the rectangles of the second pattern 122C2 are the same size. In some embodiments, the rectangles of the first pattern 122C1 and the rectangles of the second pattern 122C2 are different in size.

[0111] In the present embodiment, the first pattern 122C1 is made of a material that allows the first light beam L1 to pass through and blocks the second light beam L2 from passing through. The second pattern 122C2 is made of a material that blocks the first light beam L1 from passing through and allows the second light beam L2 to pass through. In some embodiments, the first light beam L1 has a first polarization direction, and the second light beam L2 has a second polarization direction perpendicular to the first polarization direction, for example, the first light beam L1 has a vertical polarization direction, and the second light beam L2 has a horizontal polarization direction. The first pattern 122C1 may be a material that allows a light beam in a vertical polarization direction to pass through and blocks a light beam in a horizontal polarization direction from passing through, and the second pattern 122C2 may be a material that allows a light beam in a horizontal polarization direction to pass through and blocks a light beam in a vertical polarization direction from passing through. In some embodiments, the first light beam L1 has a first wavelength, and the second light beam L2 has a second wavelength different from the first wavelength, for example, the first light beam L1 is blue light, and the second light beam L2 is red light or green light. The first pattern 122C1 may be a material that allows a first light beam having a first wavelength to pass therethrough while blocking a second light beam having a second wavelength from passing therethrough, such as a green light filter, and the second pattern 122C2 may be a material that allows a second light beam having a second wavelength to pass therethrough while blocking the first light beam having a first wavelength from passing therethrough, such as a blue light filter.

[0112] In some embodiments, the first pattern 122C1 may absorb the second light beam L2 or reflect the second light beam L2, and the second pattern 122C2 may absorb the first light beam L1 or reflect the first light beam L1. Therefore, when the first light beam L1 irradiates the first light gate 122C, the first light beam L1 passes through the first pattern 122C1, and the first light beam L1 does not pass through the second pattern 122C2. When the second light beam L2 irradiates the first light gate 122C, the second light beam L2 does not pass through the first pattern 122C1, and the second light beam L2 passes through the second pattern 122C2.

[0113] like Figure 8B As shown, the second light gate 124C includes a third pattern 124C1 and a fourth pattern 124C2. The third pattern 124C1 includes a plurality of rectangles, and the fourth pattern 124C2 includes a plurality of rectangles. The plurality of rectangles of the third pattern 124C1 and the plurality of rectangles of the fourth pattern 124C2 are arranged alternately. In some embodiments, the rectangles of the third pattern 124C1 and the rectangles of the fourth pattern 124C2 are the same size. In some embodiments, the rectangles of the third pattern 124C1 and the rectangles of the fourth pattern 124C2 are different in size.

[0114] In this embodiment, the third pattern 124C1 is made of a material that allows the first light beam L1 to pass through and blocks the second light beam L2 from passing through. The fourth pattern 124C2 is made of a material that allows the first light beam L1 to pass through and allows the second light beam L2 to pass through. In some embodiments, the first light beam L1 has a first polarization direction, and the second light beam L2 has a second polarization direction perpendicular to the first polarization direction, for example, the first light beam L1 has a vertical polarization direction, and the second light beam L2 has a horizontal polarization direction. The third pattern 124C1 may be a material that allows a light beam in a vertical polarization direction to pass through and blocks a light beam in a horizontal polarization direction from passing through, and the fourth pattern 124C2 may be a cavity without any material. In some embodiments, the first light beam L1 has a first wavelength, and the second light beam L2 has a second wavelength different from the first wavelength, for example, the first light beam L1 is blue light, and the second light beam L2 is red light or green light. The third pattern 124C1 may be a material that allows the first light beam having the first wavelength to pass through and blocks the second light beam having the second wavelength from passing through, for example, a red light filter or a green light filter. The fourth pattern 124C2 may be a cavity without any material.

[0115] In some embodiments, the third pattern 124C1 can absorb the second light beam L2 or reflect the second light beam L2. Therefore, when the first light beam L1 irradiates the second light gate 124C, the first light beam L1 passes through the third pattern 124C1 and the fourth pattern 124C2. When the second light beam L2 irradiates the second light gate 124C, the second light beam L2 does not pass through the third pattern 124C1, and the second light beam L2 passes through the fourth pattern 124C2.

[0116] Therefore, when the first light beam L1 and the second light beam L2 enter the optical shutter device 120, the first light beam L1 is patterned by the first optical shutter 122C, and the second light beam L2 is patterned by the first optical shutter 122C and the second optical shutter 124C. Specifically, the first light beam L1 is patterned by the first pattern 122C1 of the first optical shutter 122C, and the second light beam L2 is patterned by the second pattern 122C2 of the first optical shutter 122C and the fourth pattern 124C2 of the second optical shutter 124C. The first light beam L1 is patterned by one optical shutter to form a first structured light SL1, and the second light beam L2 is patterned by two optical shutters to form a second structured light SL2.

[0117] In some embodiments, the first shutter 122C and the second shutter 124C have different patterns. For example, the first pattern 122C1 of the first shutter 122C and the third pattern 124C1 of the second shutter 124C have different patterns, and the second pattern 122C2 of the first shutter 122C and the fourth pattern 124C2 of the second shutter 124C have different patterns.

[0118] In some embodiments, the first shutter 122C and the second shutter 124C have the same pattern, for example, the first pattern 122C1 of the first shutter 122C and the third pattern 124C1 of the second shutter 124C have the same pattern, and the second pattern 122C2 of the first shutter 122C and the fourth pattern 124C2 of the second shutter 124C have the same pattern.

[0119] Fig. 9A , Fig. 9B 1 is a schematic diagram of another first optical shutter and a second optical shutter according to an embodiment of the present invention. The first optical shutter 122D is Figure 2 An embodiment of the first optical shutter 122 in FIG. The second optical shutter 124D is Figure 2 An embodiment of the second optical shutter 124.

[0120] Please also refer to Figure 2 , Fig. 9A and Fig. 9B When the first light beam L1 and the second light beam L2 enter the optical shutter device 120 , the first light beam L1 passes through the first optical shutter 122D and the second optical shutter 124D in sequence, and the second light beam L2 passes through the first optical shutter 122D and the second optical shutter 124D in sequence.

[0121] Part of the first light beam L1 passes through the first light gate 122D, and another part of the first light beam L1 (i.e., the part that passes through the first light gate 122D) passes through the second light gate 124D. Part of the second light beam L2 passes through the first light gate 122D, and another part of the second light beam L2 (i.e., the part that passes through the first light gate 122D) passes through the second light gate 124D. In other words, relative to Fig. 6A and Figure 6B ,exist Fig. 9A In the embodiment, the first light beam L1 only partially passes through the first light gate 122D and the second light gate 124D, and the second light beam L2 only partially passes through the first light gate 122D and the second light gate 124D.

[0122] Specifically, when the first light beam L1 passes through the first light gate 122D, the first light gate 122D patterns the first light beam L1, that is, a portion of the first light beam L1 passes through the first light gate 122D, and another portion of the first light beam L1 is blocked by the first light gate 122D. When the first light beam L1 passing through the first light gate 122D enters the second light gate 124D, another portion of the first light beam L1 passing through the first light gate 122D is blocked by the second light gate 124D, so that the first light beam L1 is patterned again in the second light gate 124D.

[0123] On the other hand, when the second light beam L2 passes through the first light gate 122D, the first light gate 122D patterns the second light beam L2, that is, part of the second light beam L2 passes through the first light gate 122D, and another part of the second light beam L2 is blocked by the first light gate 122D. When the second light beam L2 passing through the first light gate 122D enters the second light gate 124D, another part of the second light beam L2 passing through the first light gate 122D is blocked by the second light gate 124D, so that the second light beam L2 is patterned again in the second light gate 124D.

[0124] Specifically, if Fig. 9A As shown, the first light gate 122D includes a first pattern 122D1 and a second pattern 122D2. The first pattern 122D1 includes a plurality of rectangles, and the second pattern 122D2 includes a plurality of rectangles. The plurality of rectangles of the first pattern 122D1 and the plurality of rectangles of the second pattern 122D2 are arranged alternately. In some embodiments, the rectangles of the first pattern 122D1 and the rectangles of the second pattern 122D2 are the same size. In some embodiments, the rectangles of the first pattern 122D1 and the rectangles of the second pattern 122D2 are different in size.

[0125] In the present embodiment, the first pattern 122D1 is made of a material that allows the first light beam L1 to pass through and blocks the second light beam L2 from passing through. The second pattern 122D2 is made of a material that blocks the first light beam L1 from passing through and allows the second light beam L2 to pass through. In some embodiments, the first light beam L1 has a first polarization direction, and the second light beam L2 has a second polarization direction perpendicular to the first polarization direction, for example, the first light beam L1 has a vertical polarization direction, and the second light beam L2 has a horizontal polarization direction. The first pattern 122D1 may be a material that allows a light beam in a vertical polarization direction to pass through and blocks a light beam in a horizontal polarization direction from passing through, and the second pattern 122D2 may be a material that allows a light beam in a horizontal polarization direction to pass through and blocks a light beam in a vertical polarization direction from passing through. In some embodiments, the first light beam L1 has a first wavelength, and the second light beam L2 has a second wavelength different from the first wavelength, for example, the first light beam L1 is blue light, and the second light beam L2 is red light or green light. The first pattern 122D1 may be a material that allows the first light beam with a first wavelength to pass through but blocks the second light beam with a second wavelength from passing through, such as a red light filter or a green light filter, and the second pattern 122D2 may be a material that allows the second light beam with the second wavelength to pass through but blocks the first light beam with the first wavelength from passing through, such as a blue light filter.

[0126] In some embodiments, the first pattern 122D1 can absorb the second light beam L2 or reflect the second light beam L2, and the second pattern 122D2 can absorb the first light beam L1 or reflect the first light beam L1. Therefore, when the first light beam L1 irradiates the first light gate 122D, the first light beam L1 passes through the first pattern 122D1, and the first light beam L1 does not pass through the second pattern 122D2. When the second light beam L2 irradiates the first light gate 122D, the second light beam L2 does not pass through the first pattern 122D1, and the second light beam L2 passes through the second pattern 122D2.

[0127] like Fig. 9B As shown, the second light gate 124D includes a third pattern 124D1 and a fourth pattern 124D2. The third pattern 124D1 includes a plurality of rectangles, and the fourth pattern 124D2 includes a plurality of rectangles. The plurality of rectangles of the third pattern 124D1 and the plurality of rectangles of the fourth pattern 124D2 are arranged alternately. In some embodiments, the rectangles of the third pattern 124D1 and the rectangles of the fourth pattern 124D2 are the same size. In some embodiments, the rectangles of the third pattern 124D1 and the rectangles of the fourth pattern 124D2 are different in size.

[0128] In this embodiment, the third pattern 124D1 is made of a material that allows the first light beam L1 to pass through and blocks the second light beam L2 from passing through. The fourth pattern 124D2 is made of a material that blocks the first light beam L1 from passing through and allows the second light beam L2 to pass through. In some embodiments, the first light beam L1 has a first polarization direction, and the second light beam L2 has a second polarization direction perpendicular to the first polarization direction, for example, the first light beam L1 has a vertical polarization direction, and the second light beam L2 has a horizontal polarization direction. The third pattern 124D1 may be a material that allows a light beam in a vertical polarization direction to pass through and blocks a light beam in a horizontal polarization direction from passing through, and the fourth pattern 124D2 may be a material that allows a light beam in a horizontal polarization direction to pass through and blocks a light beam in a vertical polarization direction from passing through. In some embodiments, the first light beam L1 has a first wavelength, and the second light beam L2 has a second wavelength different from the first wavelength, for example, the first light beam L1 is blue light, and the second light beam L2 is red light or green light. The third pattern 124D1 may be a material that allows the first light beam having the first wavelength to pass through and blocks the second light beam having the second wavelength from passing through, for example, a red light filter or a green light filter. The fourth pattern 124D2 may be made of a material that allows the second light beam with the second wavelength to pass through but blocks the first light beam with the first wavelength from passing through, such as a blue light filter.

[0129] In some embodiments, the third pattern 124D1 may absorb the second light beam L2 or reflect the second light beam L2, and the fourth pattern 124D2 may absorb the first light beam L1 or reflect the first light beam L1. Therefore, when the first light beam L1 irradiates the second light gate 124D, the first light beam L1 passes through the third pattern 124D1, and the first light beam L1 does not pass through the fourth pattern 124D2. When the second light beam L2 irradiates the second light gate 124D, the second light beam L2 does not pass through the third pattern 124D1, and the second light beam L2 passes through the fourth pattern 124D2.

[0130] Therefore, when the first light beam L1 and the second light beam L2 enter the optical gate device 120D, the first light beam L1 will be patterned by the first optical gate 122D and the second optical gate 124D, and the second light beam L2 will be patterned by the first optical gate 122D and the second optical gate 124D. Specifically, the first light beam L1 will be patterned by the first pattern 122D1 of the first optical gate 122D and the third pattern 124D1 of the second optical gate 124D, and the second light beam L2 will be patterned by the second pattern 122D2 of the first optical gate 122D and the fourth pattern 124D2 of the second optical gate 124D. The first light beam L1 is patterned by the two optical gates to form the first structured light SL1, and the second light beam L2 is patterned by the two optical gates to form the second structured light SL2.

[0131] In some embodiments, the first shutter 122D and the second shutter 124D have different patterns. For example, the first pattern 122D1 of the first shutter 122D and the third pattern 124D1 of the second shutter 124D have different patterns, and the second pattern 122D2 of the first shutter 122D and the fourth pattern 124D2 of the second shutter 124D have different patterns.

[0132] In some embodiments, the first shutter 122D and the second shutter 124D have the same pattern, for example, the first pattern 122D1 of the first shutter 122D and the third pattern 124D1 of the second shutter 124D have the same pattern, and the second pattern 122D2 of the first shutter 122D and the fourth pattern 124D2 of the second shutter 124D have the same pattern.

[0133] Therefore, according to different combinations of the first optical shutter and the second optical shutter, for example Fig. 6A and Figure 6B , Fig. 7A and Figure 7B , Fig. 8A and Figure 8B or Fig. 9A and Fig. 9B The shutter device 120 can pattern the first light beam L1 and the second light beam L2 and generate a first structured light SL1 and a second structured light SL2 with different depths of field.

[0134] Please refer again Figure 2 After the first light beam L1 passes through the optical shutter device 120 , the first optical shutter 122 and the second optical shutter 124 , a patterned first structured light SL1 is formed. After the second light beam L2 passes through the optical shutter device 120 , the first optical shutter 122 and the second optical shutter 124 , a patterned second structured light SL2 is formed. The first structured light SL1 and the second structured light SL2 are incident on the projection lens group 130 .

[0135] like Figure 2 As shown, the projection device 100 further includes a projection lens group 130. The projection lens group 130 is located on the optical path of the first structured light SL1 and the second structured light SL2, and is located downstream of the light gate device 120. In some embodiments, the projection lens group 130 is a combination of one or more optical lenses 132 having a refractive power, and the optical lens 132 includes, for example, various combinations of non-planar lenses such as biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, and plano-concave lenses. The present disclosure does not limit the type and type of the projection lens group 130. In some embodiments, the projection device 100 may not include the projection lens group 130, and the present disclosure is not limited thereto.

[0136] Please refer again Figure 2 After the first structured light SL1 and the second structured light SL2 patterned by the shutter device 120 pass through the projection lens group 130, the first light beam L1 generates the first structured light SL1 within the first depth of field range D1. The second light beam L2 generates the second structured light SL2 within the second depth of field range D2 different from the first depth of field range D1. The first structured light SL1 and the second structured light image SL2 are projected onto the object to be measured S (not shown), and the imaging device 200 senses the first image beam IL1 and obtains the first images I11, I12, and I13. The imaging device 200 senses the second image beam IL2 and obtains the second images I21, I22, and I23.

[0137] Specifically, the depth of field (DOF) is the distance between the closest and farthest points that can be clearly focused when the focus is aligned with a certain point, which is affected by the focal length of the lens, the aperture size, and the distance of the subject being photographed. In this embodiment, it is equivalent to the closest point (e.g., the first image I11 of the first image beam IL1, the second image I21 of the second image beam IL2) and the farthest point (e.g., the first image I13 of the first image beam IL1, the second image I23 of the second image beam IL2) that can be clearly focused when the focus of the projection lens group 130 is aligned with the object to be measured S. Therefore, the first depth of field range D1 is the distance between the first image I11 and the first image I13, and the second depth of field range D2 is the distance between the second image I21 and the second image I23. Therefore, the depth of field range D of the entire lighting device can be expanded to the range after the first depth of field range D1 and the second depth of field range D2 are superimposed, so that the depth of field range of the entire lighting device can be increased under the same lens focal length and aperture size.

[0138] Please refer again Figure 2 After the first structured light SL1 and the second structured light SL2 are projected onto the object S, they are reflected by the object S to form corresponding image beams. The first structured light SL1 is reflected by the object S to form a first image beam IL1, and the second structured light SL2 is reflected by the object S to form a second image beam IL2. The first image beam IL1 and the second image beam IL2 enter the imaging device 200A.

[0139] Figure 2 The imaging device 200A shown is Figure 1 An embodiment of an imaging device 200 in the present invention. The imaging device 200A is used to sense the first image beam IL1 and the second image beam IL2, and obtain first images I11, I12, I13 and second images I21, I22, I23 accordingly. Specifically, after the imaging device 200A receives the first image beam IL1 and the second image beam IL2 of the object to be measured S on the sensing path, the first images I11, I12, I13 and second images I21, I22, I23 are obtained through analysis and processing.

[0140] like Figure 2 As shown, the image capturing device 200A includes a lens 210A, a first image sensor 230A1 and a second image sensor 230A2. After the first image beam IL1 and the second image beam IL2 enter the lens 210A, they are split by the beam splitter 220A and then enter the first image sensor 230A1 and the second image sensor 230A2 respectively.

[0141] The lens 210A is located on the optical path of the first image beam IL1 and the second image beam IL2. In some embodiments, the lens 210A includes a combination of one or more optical lenses 212A with refractive power, and the optical lens 212A includes various combinations of non-planar lenses such as biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, and plano-concave lenses. The present disclosure does not limit the type and type of the lens 210A.

[0142] After passing through the incident lens 210A, the first image beam IL1 and the second image beam IL2 enter the beam splitter 220A, and then enter the first image sensor 230A1 and the second image sensor 230A2 respectively via the beam splitter 220A.

[0143] According to some embodiments, the first image sensor 230A1 and the second image sensor 230A2 simultaneously sense the first image I11, I12, I13 and the second image I21, I22, I23. When the first image beam IL1 and the second image beam IL2 are divided into two parts by the beam splitter 220A, a part of the first image beam IL1' and a part of the second image beam IL2' enter the first image sensor 230A1. Another part of the first image beam IL1" and another part of the second image beam IL2" enter the second image sensor 230A2. Therefore, a filter 240A1 is provided between the beam splitter 220A and the first image sensor 230A1 to remove the second image beam IL2 so that the first image beam IL1 enters the first image sensor 230A1. A filter 240A2 is disposed between the beam splitter 220A and the second image sensor 230A2 for removing the first image beam IL1 so that the second image beam IL2 is incident on the second image sensor 230A2.

[0144] Then, the first image sensor 230A1 converts the received first image beam IL1 into first images I11 , I12 , and I13 through the processor 300 , and the second image sensor 230A2 converts the received second image beam IL2 into second images I21 , I22 , and I23 through the processor 300 .

[0145] In some embodiments, the first image sensor 230A1 and the second image sensor 230A2 may include, for example, photoelectric elements that can convert optical signals into electrical signals, and their types may be, for example, complementary metal oxide semiconductor (CMOS), charge coupled device (CCD), photomultiplier tube (PMT) or avalanche photodiode (APD). Preferably, their types may be CMOS or CCD, but are not limited thereto.

[0146] Therefore, by using the imaging device 200A, the first image sensor 230A1 and the second image sensor 230A2 can be used to simultaneously sense the first image beam IL1 and the second image beam IL2, thereby increasing the ability to collect data.

[0147] In other embodiments, the first image sensor 230A1 and the second image sensor 230A2 may also sense the first image beam IL1 and the second image beam IL2 in different time periods. Specifically, the first image sensor 230A1 senses the first image beam IL1 in a first time period, and the second image sensor 230A2 senses the second image beam IL2 in a second time period different from the first time period. The first image sensor 230A1 and the second image sensor 230A2 may also sense the first image beam IL1 and the second image beam IL2 appearing in different time periods. In particular, when the light emitting device 110 is controlled to emit the first light beam L1 in the first time period to generate the first image beam IL1, and to emit the second light beam L2 in the second time period to generate the second image beam IL2, the first image sensor 230A1 and the second image sensor 230A2 may sense cleaner first images I11, I12, I13 and second images I21, I22, I23, respectively, to increase the resolution of the image.

[0148] Fig.10 is a schematic diagram of a lighting device according to an embodiment of the present invention. Fig.10 . Fig.10 The lighting device 10B shown is Figure 1 An embodiment of the lighting device 10 is shown in FIG. Fig.10 The lighting device 10B shown is Figure 2 The lighting device 10A shown is similar, so the similarities are not repeated here. Fig.10 and Figure 2 The difference is that Figure 2 The imaging device 200A is replaced by the imaging device 200B.

[0149] Fig.10 The imaging device 200B is Figure 1 An embodiment of the imaging device 200. Fig.10 As shown, the image capturing device 200B includes a lens 210B and an image sensor 230B.

[0150] In this embodiment, the lens 210B has a plurality of optical lenses 212B. Figure 2 The lens 210B is similar to the lens 210A of the present invention, so the similarities are not repeated here. The difference between the lens 210B and the lens 210A is that the lens 210B is a movable lens. The lens 210B moves forward and backward along the optical path of the first image beam IL1 and the second image beam IL2 to change the position of the first image I11, I12, I13 and the second image I21, I22, I23 projected on the image sensor 230B of the imaging device 200B.

[0151] On the other hand, the image capturing device 200B only has an image sensor 230B. After the first image beam IL1 and the second image beam IL2 pass through the lens 210B, they enter the image sensor 230B. Therefore, the image sensor 230B can simultaneously receive the first image beam IL1 and the second image beam IL2, and simultaneously sense the first images I11, I12, I13 and the second images I21, I22, I23.

[0152] In this embodiment, the type of the image sensor 230B is Figure 2 The first image sensor 230A1 and the second image sensor 230A2 are similar, and thus will not be described in detail herein.

[0153] In other embodiments, the image sensor 230B may also be replaced by Figure 2 The light splitting element 220A, the first image sensor 230A1 and the second image sensor 230A2 are shown, but the disclosure is not limited thereto.

[0154] By Fig.10 The imaging device 200B shown in the figure can change the positions of the first image beam IL1 and the second image beam IL2 projected on the image sensor 230B by adjusting the position of the lens 210B, so that the image sensor 230B can improve the image quality of the first images I11, I12, I13 and the second images I21, I22, I23.

[0155] Fig.11 is a schematic diagram of a lighting device according to an embodiment of the present invention. Fig.11 . Fig.11 The lighting device 10C shown is Figure 1 An embodiment of the lighting device 10 is shown in FIG. Fig.11The lighting device 10C shown is Figure 2 The lighting device 10A shown is similar, so the similarities are not repeated here. Fig.11 and Figure 2 The difference is that Figure 2 The imaging device 200A is replaced by the imaging device 200C.

[0156] Fig.11 The imaging device 200C is Figure 1 An embodiment of the imaging device 200. Fig.11 As shown, the image capturing device 200C includes a lens 210C and an image sensor 230C.

[0157] In this embodiment, the lens 210C has a plurality of optical lenses 212C. Figure 2 The difference between the lens 210C and the lens 210A is that the lens 210C further includes a zoom lens 212C1 for changing the focal length of the lens 210C to adjust the image capturing position of the image sensor 230C of the image capturing device 200C, so that the image sensor 230C can improve the image quality of the first images I11, I12, I13 and the second images I21, I22, I23 at different depths of field.

[0158] In some embodiments, the zoom lens 212C1 is located at a position of the optical lens 212 of the lens 210C that is closest to the image sensor 230C. The zoom lens 212C1 may also be located at other suitable positions of the lens 210C, and the present disclosure is not limited thereto.

[0159] In some embodiments, the zoom lens 212C1 may be an electromagnetically driven zoom lens, a fluid pressure driven zoom lens, an electro-deformation driven zoom lens, or the like, but the present disclosure is not limited thereto.

[0160] On the other hand, in this embodiment, the type of the image sensor 230C is similar to that of the image sensor 230B, and thus will not be described in detail herein.

[0161] In other embodiments, the image sensor 230C may also be replaced by Figure 2 The light splitting element 220A, the first image sensor 230A1 and the second image sensor 230A2 are shown, but the disclosure is not limited thereto.

[0162] By Fig.11The imaging device 200C shown in the figure can adjust the focal length of the lens 210C by means of the zoom lens 212C1 to adjust the imaging position of the image sensor 230C of the imaging device 200C, so that the image sensor 230C can improve the image quality of the first images I11, I12, I13 and the second images I21, I22, I23 at different depths of field.

[0163] Fig.12 is a schematic diagram of a lighting device according to an embodiment of the present invention. Fig.12 . Fig.12 The lighting device 10D shown is Figure 1 An embodiment of the lighting device 10 is shown in FIG. Fig.12 The lighting device 10D shown is Figure 2 The lighting device 10A shown is similar, so the similarities are not repeated here. Fig.12 and Figure 2 The difference is that Figure 2 The imaging device 200A is replaced by the imaging device 200D.

[0164] Fig.12 The imaging device 200D is Figure 1 An embodiment of the imaging device 200. Fig.12 As shown, the image capturing device 200C includes a lens 210D and an image sensor 230D.

[0165] In this embodiment, the lens 210D has a plurality of optical lenses 212D. Figure 2 The lens 210D is similar to the lens 210A of the imaging device 200D, so the similarities are not repeated here. The difference between the lens 210D and the lens 210A is that the lens 210D includes a movable lens 214. In some embodiments, the movable lens 214 is a movable lens 214. Based on the movable lens 214 moving along the optical path of the first image beam IL1 and the second image beam IL2 in the lens 210D, the focal length of the lens 210D is changed to adjust the imaging position of the image sensor 230D of the imaging device 200D, so that the image sensor 230C can improve the image quality of the first image I11, I12, I13 and the second image I21, I22, I23 at different depths of field. In some embodiments, the movable lens 214 can be located at any position of the lens 210D, and the present disclosure is not limited thereto.

[0166] In some embodiments, the movable lens 214 can be any non-planar lens such as a biconcave lens, a biconvex lens, a meniscus lens, a convex-concave lens, a plano-convex lens, and a plano-concave lens. The present disclosure does not limit the shape and type of the movable lens 214.

[0167] In some embodiments, the lens 210D includes a light-transmissive movable flat lens 214. Based on the propagation direction of the movable flat lens 214 along the optical path perpendicular to the first image beam IL1 and the second image beam IL2, the movable flat lens 214 is inserted or removed in the optical path, or the thickness of the movable flat lens 214 is changed, so as to change the propagation distance of the first image beam IL1 and the second image beam IL2 in the lens 210D, thereby changing the focal length of the lens 210D to adjust the imaging position of the image sensor 230D of the imaging device 200D, so that the image sensor 230C can improve the image quality of the first images I11, I12, I13 and the second images I21, I22, I23 at different depths of field.

[0168] In some embodiments, the movable flat lens 214 may be located at any position of the lens 210D, but the present disclosure is not limited thereto.

[0169] In some embodiments, the movable flat lens 214 may be, for example, a flat lens including an array of corners. The present disclosure does not limit the shape and type of the movable flat lens 214 .

[0170] In a preferred embodiment, the lens 210D may include a plurality of the movable lenses 214 and / or movable flat lenses 214, and the focal length of the lens 210D may be changed by working together based on the increase or decrease in the number of the movable lenses 214 and / or movable flat lenses 214 in the optical paths of the first image beam IL1 and the second image beam IL2.

[0171] On the other hand, in this embodiment, the type of the image sensor 230D is similar to that of the image sensor 230B, and thus will not be described in detail herein.

[0172] In other embodiments, the image sensor 230D may also be replaced by Figure 2 The light splitting element 220A, the first image sensor 230A1 and the second image sensor 230A2 are shown, but the disclosure is not limited thereto.

[0173] By Fig.12 The imaging device 200D shown in the figure can adjust the focal length of the lens 210D by changing the position of the movable lens 214 on the lens 210D to adjust the imaging position of the image sensor 230D, so that the image sensor 23D can improve the image quality of the first images I11, I12, I13 and the second images I21, I22, I23.

[0174] In summary, the present invention can simultaneously generate two images with different depths of field by controlling the shapes of the first light shutter and the second light shutter, thereby improving the depth of field of the system while maintaining brightness.

[0175] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A lighting device, It is characterized in that include: A projection device, comprising: A light emitting device, used to generate a first light beam to illuminate an object to be tested, and to generate a second light beam different from the first light beam to illuminate the object to be tested; An optical shutter device is located on the optical path of the first light beam and the second light beam, and the optical shutter device includes: A first light shutter, located on a light incident surface of the light shutter device; and A second optical shutter is located on the light-emitting surface of the optical shutter device, wherein the first light beam passes through the optical shutter device to generate a first structured light within a first depth of field, and the second light beam passes through the optical shutter device to generate a second structured light within a second depth of field different from the first depth of field, and the first structured light and the second structured light are projected onto the object to be measured and reflected to generate a first image beam and a second image beam respectively; and The imaging device is used to sense the first image beam and the second image beam to obtain the corresponding first image and second image respectively.

2. The lighting device according to claim 1, It is characterized in that The first light beam has a first wavelength, and the second light beam has a second wavelength different from the first wavelength.

3. The lighting device according to claim 1, It is characterized in that The first light beam has a first polarization direction, and the second light beam has a second polarization direction perpendicular to the first polarization direction.

4. The lighting device according to claim 1, It is characterized in that The light incident surface and the light emitting surface of the optical shutter device are parallel to each other.

5. The lighting device according to claim 1, It is characterized in that The thickness of the shutter device is changed to adjust the depth of field of the first structured light and / or the second structured light.

6. The lighting device according to claim 1, It is characterized in that A portion of the first light beam passes through the first light gate, and the portion of the first light beam completely passes through the second light gate.

7. The lighting device according to claim 1, It is characterized in that The second light beam completely passes through the first light gate, and a portion of the second light beam passes through the second light gate.

8. The lighting device according to claim 1, It is characterized in that The first light gate includes a first pattern and a second pattern that are arranged alternately with each other. Wherein, when the first light beam irradiates the first light gate, the first light beam passes through the first pattern, and the first light beam does not pass through the second pattern; When the second light beam irradiates the first light gate, the second light beam passes through the first pattern and the second pattern; or, the second light beam does not pass through the first pattern, but passes through the second pattern.

9. The lighting device according to claim 1, It is characterized in that The second light gate includes a third pattern and a fourth pattern that are arranged alternately with each other, Wherein, when the first light beam irradiates the second light gate, the first light beam passes through the third pattern and the fourth pattern; or, the first light beam passes through the third pattern, and the first light beam does not pass through the fourth pattern; When the second light beam irradiates the second light gate, the second light beam does not pass through the third pattern, and the second light beam passes through the fourth pattern.

10. The lighting device according to claim 1, It is characterized in that The image capturing device includes a first image sensor and a second image sensor. The first image sensor is used to sense the first image light beam, and the second image sensor is used to sense the second image light beam.

11. The lighting device according to claim 10, It is characterized in that The first image sensor and the second image sensor simultaneously sense the first image beam and the second image beam; Alternatively, the first image sensor senses the first image light beam in a first time period, and the second image sensor senses the second image light beam in a second time period different from the first time period.

12. The lighting device according to claim 1, It is characterized in that The image capturing device includes an image sensor. The image sensor senses the first image light beam in a first time period and senses the second image light beam in a second time period different from the first time period.

13. The lighting device according to claim 1, It is characterized in that The imaging device comprises a lens, The lens is a movable lens, and the movable lens moves forward and backward along the optical path to change the positions where the first image and the second image are projected on the imaging device; Alternatively, the lens includes a zoom lens for changing the focal length of the lens; Alternatively, the lens includes a light-transmitting movable flat lens, and the focal length of the lens is changed based on the insertion or removal of the movable flat lens in the light path along a propagation direction perpendicular to the light path, or the change of the thickness of the movable flat lens.

Images