Fluorescent roller module, light source and projector

Abstract

The present invention provides a fluorescent drum module, a light source, and a projector, relating to the technical field of projectors. The fluorescent drum module provided by the present invention has a light conduction station and a wavelength conversion station; the fluorescent drum module is configured to switch between the light conduction station and the wavelength conversion station by rotating; the rotation axis of the fluorescent drum module extends in the vertical direction. The fluorescent drum module provided by the present invention can reduce light loss and improve conversion efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of projectors, and more particularly to a fluorescent drum module, a light source and a projector. Background Art

[0002] As the power of a laser projector increases, its volume also increases according to the heat dissipation requirements. Taking a cylindrical wavelength conversion device as an example, as the power of the projector increases, to ensure good heat dissipation performance of the cylindrical wavelength conversion device, the radial dimension of the drum module also needs to increase, resulting in an increase in the height dimension of the projector, which in turn has an adverse effect on the stability of the projector. In addition, a single beam of blue light emitted by a laser cannot pass through an existing fluorescent drum module, and the projector needs to add a laser to provide blue light, which not only has a high light loss, but also has a complex optical path, resulting in a further increase in the size of the projector. Summary of the Invention

[0003] The object of the present invention is to provide a fluorescent drum module, a light source and a projector, which can directly achieve blue light output, reduce light loss and improve conversion efficiency.

[0004] In a first aspect, the fluorescent drum module provided by the present invention has a light conduction station and a wavelength conversion station; the fluorescent drum module is configured to rotate to switch between the light conduction station and the wavelength conversion station.

[0005] In combination with the first aspect, the present invention provides a first possible implementation manner of the first aspect, wherein the fluorescent drum module includes a substrate; from the wavelength conversion station to the light conduction station, a wavelength conversion part and a light transmission part are successively arranged on the substrate.

[0006] In combination with the first possible implementation manner of the first aspect, the present invention provides a second possible implementation manner of the first aspect, wherein the substrate encloses to form an accommodation area, and a light guiding device is arranged in the accommodation area; the substrate is configured to rotate around the accommodation area to switch between the light conduction station and the wavelength conversion station; at the light conduction station, the light incident on the fluorescent drum module is emitted through the light transmission part and the light guiding device; at the wavelength conversion station, the light incident on the fluorescent drum module is processed by the substrate and then emitted.

[0007] In combination with the second possible implementation manner of the first aspect, the present invention provides a third possible implementation manner of the first aspect, wherein the light guiding device includes a light guiding rod.

[0008] In combination with the third possible implementation of the first aspect, the present invention provides a fourth possible implementation of the first aspect, wherein the extension direction of the light guide rod has an angle less than 90 degrees with the rotation axis of the base; in the light transmission station, the light incident on the fluorescent roller module is incident on the light guide rod through the light transmission part, and the light processed by the light guide rod is emitted to the outside of the accommodating area.

[0009] In combination with the third possible implementation of the first aspect, the present invention provides a fifth possible implementation of the first aspect, wherein the light-transmitting portion includes: a first side opening and a second side opening, the first side opening and the second side opening are arranged at intervals and are respectively arranged on the base; in the light transmission station, the light guide device extends from the first side opening to the second side opening.

[0010] In combination with the first aspect, the present invention provides a sixth possible implementation of the first aspect, wherein the base is transmission-connected to the rotor of the driving device, and the light-guiding device is connected to the stator of the driving device, so that the base rotates relative to the light-guiding device.

[0011] In combination with the first aspect, the present invention provides a seventh possible implementation of the first aspect, wherein the base is connected to the light guide device so that the base and the light guide device rotate synchronously.

[0012] In combination with the first aspect, the present invention provides an eighth possible implementation of the first aspect, wherein the rotation axis of the fluorescent drum module extends in a vertical direction.

[0013] In a second aspect, the light source provided by the present invention comprises the fluorescent roller module provided in the first aspect; the light source has a first light path and a second light path, the outgoing light of the fluorescent roller module at the light transmission station is incident on the first light path, and the outgoing light of the fluorescent roller module at the wavelength conversion station is incident on the second light path; the light source is configured to combine the light incident on the first light path and the light incident on the second light path and emit them.

[0014] In combination with the second aspect, the present invention provides a first possible implementation manner of the second aspect, wherein the light source includes: a light combining device and a light path guiding device; the outgoing light of one of the first light path and the second light path enters the light path guiding device, and is processed by the light path guiding device and enters the light combining device; the outgoing light of the other of the first light path and the second light path enters the light combining device; the light combining device is used to combine light and emit light.

[0015] In a second aspect, the present invention provides a projector provided with the fluorescent roller module provided in the first aspect.

[0016] The embodiments of the present invention bring the following beneficial effects: The fluorescent drum module has a light conduction station and a wavelength conversion station. The fluorescent drum module rotates to switch between the light conduction station and the wavelength conversion station. The fluorescent drum module provided by the present invention can directly achieve blue light output without adding a blue light laser when applied to blue light excitation, which is beneficial to reducing light loss and improving conversion efficiency.

[0017] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following specific preferred embodiments are given in conjunction with the accompanying drawings and described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the related art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 Cross-section of the first fluorescent drum module provided by the embodiment of the present invention Figure 1 ;

[0020] Figure 2 Cross-sectional view of the second fluorescent drum module provided by the embodiment of the present invention;

[0021] Figure 3 Cross-section of the first fluorescent drum module provided by the embodiment of the present invention Figure 2 ;

[0022] Figure 4 Front view of the third fluorescent drum module provided by the embodiment of the present invention;

[0023] Figure 5 Schematic diagram of the light source provided by the embodiment of the present invention.

[0024] Reference numerals: 100 - Substrate; 101 - Accommodation area; 110 - Light transmission part; 111 - First side opening; 112 - Second side opening; 120 - Wavelength conversion part; 121 - First conversion area; 122 - Second conversion area; 200 - Light guiding device; 300 - Driving device; 400 - Light combining device; 410 - Beam splitter; 420 - First lens; 430 - Light guiding tube; 500 - Excitation light source; 510 - Laser source; 520 - Fourth lens; 530 - Collimating lens; 540 - Third diffuser; 600 - Light path guiding device; 610 - First reflector; 620 - Second reflector; 630 - Third reflector; 001 - First light path; 002 - Second light path; Z - Vertical direction. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. For the physical quantities in the formulas, if not separately marked, they should be understood as the basic quantities of the basic units of the International System of Units, or the derived quantities derived from the basic quantities through mathematical operations such as multiplication, division, differentiation, or integration.

[0027] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] This embodiment is described with respect to the excitation and conduction of blue light. In fact, the present invention is applicable to the excitation and conduction of light in any wavelength range.

[0029] Embodiment 1 is as Figure 1 and Figure 2As shown in the figure, the fluorescent drum module provided by the embodiment of the present invention has a light conduction station and a wavelength conversion station; the fluorescent drum module is configured to rotate to switch between the light conduction station and the wavelength conversion station. Among them, the fluorescent drum module can switch between the light conduction station and the wavelength conversion station by rotating. At the light conduction station, blue light is emitted, and at the wavelength conversion station, wavelength conversion processing is realized. There is no need to add a blue light laser, which solves the technical problem that the fluorescent drum module cannot directly provide blue light, helps to simplify the optical path, can reduce light loss, and improve the conversion efficiency. It should be noted that the fluorescent drum module realizes the switching between the light conduction station and the wavelength conversion station by rotating. The movement in the switching process is smoother than the reciprocating translational movement. In the wavelength conversion station, each color segment can be smoothly switched in the optical path. At the light conduction station, blue light, red light or yellow light can be processed and emitted by the fluorescent drum module.

[0030] Furthermore, the rotation axis of the fluorescent drum module extends along the vertical direction Z.

[0031] Specifically, the rotation axis of the fluorescent drum module extends along the vertical direction Z. To improve the heat dissipation efficiency of the fluorescent drum module, the radial dimension of the fluorescent drum module can be increased without causing an increase in the thickness dimension of the fluorescent drum module. The axial dimension of the fluorescent drum module can be configured to be 3 cm to 4.5 cm, for example: 3.5 cm or 4 cm, so that the fluorescent drum module can be used to manufacture an ultra-thin and portable laser projector.

[0032] In the embodiment of the present invention, the fluorescent drum module includes a base body 100; from the wavelength conversion station to the light conduction station, a wavelength conversion part 120 and a light transmission part 110 are successively arranged on the base body 100.

[0033] Specifically, at the light conduction station, the light transmission part 110 is located in the optical path; at the wavelength conversion station, the wavelength conversion part 120 is located in the optical path. Driving the base body 100 to rotate around the axis extending along the vertical direction Z, the wavelength conversion part 120 and the light transmission part 110 alternately pass through the optical path. When the light transmission part 110 is arranged in the optical path, blue light can be transmitted by the fluorescent drum module, so that a blue light optical path can be formed without adding a blue light laser.

[0034] Furthermore, the base body 100 encloses to form a containing area 101, and a light guiding device 200 is arranged in the containing area 101; the base body 100 is configured to rotate around the containing area 101 to switch between the light conduction station and the wavelength conversion station; at the light conduction station, the light incident on the fluorescent drum module is emitted through the light transmission part 110 and the light guiding device 200; at the wavelength conversion station, the light incident on the fluorescent drum module is processed and emitted by the base body 100.

[0035] Specifically, the blue light can be processed and transmitted by the light guiding device 200. The base body 100 rotates around the accommodating area 101, so as to switch to the light conduction station or the wavelength conversion station. The light guiding device 200 can adopt a blue light reflector or a lens.

[0036] In this embodiment, the light guiding device 200 includes a light guiding rod. The blue light entering the light guiding rod through the light transmission part 110 is transmitted along the light guiding rod. The light guiding rod can adopt a solid or hollow glass rod. The light guiding rod has a light homogenizing effect on the blue light, which can not only transmit the blue light without loss, but also does not need to increase the thickness dimension of the fluorescent roller module for setting the light guiding rod.

[0037] Further, the end face of the light guiding rod can be coated with a fluorescent wavelength conversion body, so as to be able to generate partial excitation, for example, generate blue light with an excitation light of 455 nm. Blue powder is coated on the end face of the light guiding rod. Part of the excited 455 nm blue light is projected into the light guiding rod, while the 490 nm long-wave blue light generated by part of the excited phosphor is reflected and does not enter the light rod. The proportion of partial excitation can be controlled according to the thickness of the phosphor, that is, the thickness of the blue powder, to realize the diversification of blue light and enhance the color saturation of blue.

[0038] Such as Figure 1 and Figure 3 As shown, the base body 100 is in transmission connection with the rotor of the driving device 300, and the light guiding device 200 is connected with the stator of the driving device 300, so that the base body 100 rotates relative to the light guiding device 200.

[0039] Specifically, the light guiding device 200 is connected with the stator of the driving device 300. The light guiding device 200 is fixed relative to the optical path of the incident light. The blue light entering the light guiding device 200 can be transmitted along the light guiding device 200. The extending direction of the light guiding device 200 is parallel to the transmission direction of the blue light, which can reduce the loss in the process of blue light transmission and further improve the blue light efficiency. During the rotation of the base body 100, when the light transmission part 110 is located in the optical path of the light guiding device 200, the light enters the light guiding device 200 through the light transmission part 110 and is emitted through the light guiding device 200. When the wavelength conversion part 120 is located in the optical path of the light guiding device 200, the wavelength conversion part 120 blocks the light guiding device 200, and the light is processed and reflected by the wavelength conversion part 120.

[0040] Such as Figure 2 As shown, the base body 100 is connected with the light guiding device 200, so that the base body 100 and the light guiding device 200 rotate synchronously.

[0041] Specifically, holes are provided in the side wall of the base body 100 in the radial direction. The light guiding device 200 is inserted into the holes and extends along the radial direction of the base body 100. The base body 100 and the light guiding device 200 rotate synchronously around the axis of the base body 100 to realize the switching between the light conduction station and the wavelength conversion station.

[0042] As Figure 2 and Figure 3 shown, the light transmission part 110 includes: a first side opening 111 and a second side opening 112, the first side opening 111 and the second side opening 112 are spaced apart and are respectively arranged on the base body 100; in the light conduction working position, the light guiding device 200 extends from the first side opening 111 to the second side opening 112. Among them, the base body 100 encloses a receiving area 101 with a circular cross-section, and the light guiding device 200 extends along the radial direction of the receiving area 101. In the light conduction working position, the light guiding device 200 extends from the first side opening 111 to the second side opening 112, and light enters the light guiding device 200 through one of the first side opening 111 and the second side opening 112, and the blue light transmitted through the light guiding device 200 exits through the other of the first side opening 111 and the second side opening 112. In the wavelength conversion working position, light is directed to the wavelength conversion part 120, and the wavelength conversion part 120 can convert the excitation light into the stimulated light and reflect it.

[0043] Furthermore, the wavelength conversion part 120 includes: a first conversion area 121 and a second conversion area 122, the first side opening 111 and the second side opening 112 are arranged on both sides of the receiving area 101 along a diameter of the receiving area 101 in a one-to-one correspondence, and the first conversion area 121 and the second conversion area 122 are symmetrically arranged with respect to this diameter. The base body 100 can be switched from the wavelength conversion working position to the light conduction working position once every 180 degrees of rotation around the axis of the receiving area 101. By rotating the base body 100 to realize the switching of the wavelength conversion working position and the light conduction working position at a certain period, the stimulated light and the blue light can be generated and emitted in sequence according to the time sequence.

[0044] As Figure 3 and Figure 4 shown, the extending direction of the light guiding rod has an angle less than 90 degrees with the rotation axis of the base body 100; in the light conduction working position, the light entering the fluorescent drum module enters the light guiding rod through the light transmission part 110, and the light processed by the light guiding rod exits to the outside of the receiving area 101.

[0045] Specifically, in the light conduction working position, the light entering the fluorescent drum module enters one end of the light guiding rod through the light transmission part 110, and the other end of the light guiding rod tilts upward to the outside of the receiving area 101, and the light emitted from the light guiding rod can directly exit to the outside of the receiving area 101, further reducing the light loss. It should be noted that under the condition that the angle between the extending direction of the light guiding rod and the rotation axis of the base body 100 is less than 90 degrees, the light transmission part 110 can be configured as an opening arranged on the side wall of the base body 100, and when the base body 100 rotates 360 degrees, there is only one light conduction working position. The wavelength conversion part 120 has continuous color segments, and during the process of being in the light conduction working position, the conversion areas of each color segment continuously perform light processing and generate corresponding stimulated light, which can make the light emission brightness and color effect better.

[0046] Embodiment 2

[0047] As Figure 2 、 Figure 3 and Figure 5 shown, the light source provided in the embodiment of the present invention includes the fluorescent drum module provided in Embodiment 1; the light source has a first optical path 001 and a second optical path 002. The light emitted by the fluorescent drum module at the light conduction station is incident on the first optical path 001, and the light emitted by the fluorescent drum module at the wavelength conversion station is incident on the second optical path 002; the light source is configured to combine the light incident on the first optical path 001 and the light incident on the second optical path 002 and emit the combined light.

[0048] In some embodiments, the first optical path 001 coincides with the second optical path 002, and the blue light emitted through the first optical path 001 and the excited light emitted through the second optical path 002 are combined and emitted.

[0049] In this embodiment, the first optical path 001 and the second optical path 002 form an angle. The optical path guiding device 600 can guide the blue light or the excited light, so as to combine the blue light emitted from the first optical path 001 and the excited light emitted from the second optical path 002 and emit the combined light.

[0050] In the embodiment of the present invention, the light source includes: a light combining device 400 and an optical path guiding device 600; the light emitted from one of the first optical path 001 and the second optical path 002 is incident on the optical path guiding device 600, and after being processed by the optical path guiding device 600, it is incident on the light combining device 400; the light emitted from the other of the first optical path 001 and the second optical path 002 is incident on the light combining device 400; the light combining device 400 is used for combining the light and emitting the combined light.

[0051] Specifically, the light combining device 400 includes a beam splitting film 410, and the excitation light emitted by the excitation light source 500 is incident on the fluorescent drum module after being processed by the beam splitting film 410. At the wavelength conversion station, the wavelength conversion unit 120 converts the excitation light into excited light and reflects the excited light to the beam splitting film 410. The excited light is emitted after passing through the transmissive beam splitting film 410. At the light conduction station, the light is incident on the light guiding device 200, and the blue light emitted from the light guiding device 200 is incident on the optical path guiding device 600. The optical path guiding device 600 can guide the blue light to be incident on the beam splitting film 410, and the blue light after being processed by the beam splitting film 410 is emitted in the same direction as the excited light, so as to achieve light combination. Alternatively, the light combining device 400 is arranged on the light output side of the light guiding device 200, and the blue light emitted from the light guiding device 200 is incident on the light combining device 400. The excited light formed after being processed by the wavelength conversion unit 120 is incident on the optical path guiding device 600, and the optical path guiding device 600 transmits the excited light to be incident on the light combining device 400, so as to achieve the combination of the blue light and the excited light.

[0052] Further, the light combining device 400 further includes a first lens 420. The blue light and the stimulated light emitted from the light combining device 400 enter the first lens 420, and the first lens 420 combines the blue light and the stimulated light.

[0053] Further, the light combining device 400 further includes a light guide tube 430. The first lens 420 guides the blue light and the stimulated light into the light guide tube 430, and the blue light and the stimulated light are further combined in the light guide tube 430 and emitted outside the light source.

[0054] Further, the optical path guiding device 600 includes: a first reflector 610, a second reflector 620, and a third reflector 630; the blue light or the stimulated light emitted from the fluorescent drum module enters the first reflector 610, the first reflector 610 guides the light into the second reflector 620, and then the second reflector 620 guides the light into the third reflector 630. After being processed by the third reflector 630, the light enters the light combining device 400. Among them, a second lens is provided between the first reflector 610 and the second reflector 620, a third lens and a first diffuser are provided between the second reflector 620 and the third reflector 630, and a second diffuser is provided between the third reflector 630 and the light combining device 400. The first lens 420, the second lens, and the third lens can all be convex lenses, and the optical path guiding device 600 can perform light homogenization processing on the light transmitted along the optical path guiding device 600. It should be noted that under the condition that the included angle between the extending direction of the light guide rod and the rotation axis of the base 100 is less than 90 degrees, the first reflector 610 and the second reflector 620 should be tilted correspondingly, so as to conduct the light directly emitted from the light guiding device 200 to the third reflector 630 and reflect it to the light combining device 400 through the third reflector 630.

[0055] Further, the excitation light source 500 includes: a laser source 510, a fourth lens 520, a collimating lens 530, and a third diffuser 540; the laser source 510 emits excitation light and enters the fourth lens 520. The fourth lens 520 is a convex lens. The excitation light processed by the fourth lens 520 enters the collimating lens 530, the light processed by the collimating lens 530 enters the third diffuser 540, and the excitation light emitted from the third diffuser 540 enters the beam splitter 410 and enters the fluorescent drum module after being processed by the beam splitter 410.

[0056] Embodiment III

[0057] As Figure 1As shown in the figure, the projector provided by the embodiment of the present invention is provided with the fluorescent drum module provided by Embodiment 1. By adopting the fluorescent drum module, and the fluorescent drum module rotates to switch between the light conduction station and the wavelength conversion station, and the rotation axis of the fluorescent drum module extends along the vertical direction Z, so that the thickness dimension configured by the projector for assembling the fluorescent drum module can be reduced, and then it is suitable for manufacturing an ultra-thin projector with a thickness dimension less than 4 cm to meet the market demand of portable office.

[0058] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fluorescent drum module, characterized in that, the fluorescent drum module has a light conduction station and a wavelength conversion station; the fluorescent drum module is configured to switch between the light conduction station and the wavelength conversion station by rotation; the fluorescent drum module includes a substrate (100); from the wavelength conversion station to the light conduction station, a wavelength conversion part (120) and a light transmission part (110) are successively provided on the substrate (100); the substrate (100) encloses to form a receiving area (101), and a light guiding device (200) is arranged in the receiving area (101); the substrate (100) is configured to rotate around the receiving area (101) to switch between the light conduction station and the wavelength conversion station; at the light conduction station, the light incident on the fluorescent drum module is emitted through the light transmission part (110) and the light guiding device (200); at the wavelength conversion station, the light incident on the fluorescent drum module is processed by the substrate (100) and then emitted; the light guiding device (200) includes a light guiding rod, and the light guiding rod is made of a solid or hollow glass rod; the extending direction of the light guiding rod has an angle less than 90 degrees with the rotation axis of the substrate (100); at the light conduction station, the light incident on the fluorescent drum module is incident on the light guiding rod through the light transmission part (110), and the light processed by the light guiding rod is emitted to the outside of the receiving area (101); the light transmission part (110) includes an opening provided on the side wall of the receiving area (101), and the number of the openings is one, and the wavelength conversion part (120) forms a continuous color segment.

2. The fluorescent drum module according to claim 1, characterized in that, the substrate (100) is in transmission connection with the rotor of the driving device (300), and the light guiding device (200) is connected with the stator of the driving device (300), so that the substrate (100) rotates relative to the light guiding device (200).

3. The fluorescent drum module according to claim 1, characterized in that, the substrate (100) is connected with the light guiding device (200), so that the substrate (100) and the light guiding device (200) rotate synchronously.

4. The fluorescent drum module according to claim 1, characterized in that, the rotation axis of the fluorescent drum module extends in the vertical direction.

5. A light source, characterized in that, it includes the fluorescent drum module according to any one of claims 1-4; the light source has a first optical path (001) and a second optical path (002), the outgoing light of the fluorescent drum module at the light conduction station is incident on the first optical path (001), and the outgoing light of the fluorescent drum module at the wavelength conversion station is incident on the second optical path (002); the light source is configured to combine the light incident on the first optical path (001) and the light incident on the second optical path (002), and then emit the combined light.

6. The light source according to claim 5, characterized in that, the light source includes: a light combining device (400) and an optical path guiding device (600); The outgoing light of either the first optical path (001) or the second optical path (002) is incident on the optical path guiding device (600), and after being processed by the optical path guiding device (600), it is incident on the light combining device (400). The outgoing light of the other of the first optical path (001) and the second optical path (002) is incident on the light combining device (400). The light combining device (400) is used for combining light and emitting the light.

7. A projector characterized in that the projector is provided with the fluorescent drum module according to any one of claims 1-4.

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