Laser projection device

Abstract

The utility model relates to a laser projection device, which comprises a laser light source, a focus lens group, a fluorescent wheel, a solid phosphor and a moving device, and is characterized in that laser emitted by the laser light source forms a light spot through the focus lens group; the moving device drives the solid-state phosphor to move, so that the solid-state phosphor intrudes into the light path, the light spot is irradiated on the solid-state phosphor, or the solid-state phosphor is separated from the light path, and the light spot is irradiated on the fluorescent wheel.

Description

Technical Field

[0001] The utility model relates to the technical field of laser projection, in particular to a laser projection device. Background Art

[0002] Projectors are mainly divided into three types according to the light source: bulb, LED and laser. Among them, laser projectors are the most advanced projection technology at present, and laser projectors using fluorescent wheels are the most cost-effective models. Fluorescent wheel laser projectors emit light through lasers. The light passes through a series of optical lenses and converges into a point, which hits the fluorescent wheel to stimulate light of a specific color. Light hitting the fluorescent wheel will generate a lot of heat. The existing method is to dissipate heat by rotating the fluorescent wheel at high speed, but this method still cannot meet the long-term use of the fluorescent wheel. In addition, when a malfunction occurs and the problem of stopping rotation occurs, the fluorescent wheel that cannot dissipate heat will burn out directly. At this time, the laser can only be interrupted, which causes the projection image to be unable to be displayed. Utility Model Content

[0003] In view of the above situation, it is necessary to propose a laser projection device that solves the problem of long-term use.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A laser projection device comprises a laser light source, a focusing lens group and a fluorescent wheel, wherein the laser light emitted by the laser light source forms a light spot through the focusing lens group, and further comprises a solid-state fluorescent body and a moving device, wherein the moving device drives the solid-state fluorescent body to move so that the solid-state fluorescent body invades an optical path so that the light spot is irradiated on the solid-state fluorescent body or causes the solid-state fluorescent body to leave the optical path so that the light spot is irradiated on the fluorescent wheel.

[0006] Furthermore, the solid-state phosphor includes a high-temperature resistant base and a phosphor layer attached to the high-temperature resistant base.

[0007] Furthermore, it also includes a ceramic sheet, the phosphor layer is attached to the ceramic sheet, and the ceramic sheet is fixed on the high temperature resistant base.

[0008] Furthermore, the moving device is a linear moving mechanism.

[0009] Furthermore, the linear motion mechanism includes a double-headed motor, a guide rail and a slide plate, a first output shaft extends from one end of the double-headed motor and a second output shaft extends from the other end, gears are connected to the first output shaft and the second output shaft, the slide plate slides with the guide rail, two toothed belts are provided on the slide plate, one of the toothed belts is meshed with the gear on the first output shaft, and the other toothed belt is meshed with the gear on the second output shaft, and the solid-state phosphor is fixed on the slide plate.

[0010] Furthermore, a limiting structure is provided between the guide rail and the slide plate, and when the solid-state fluorescent body moves to a position where the light spot irradiates the solid-state fluorescent body, the limiting structure causes the guide rail to abut against the slide plate.

[0011] Furthermore, the moving device is a rotating mechanism.

[0012] Furthermore, the fluorescent wheel is connected to a high-speed rotating device.

[0013] Furthermore, the focusing lens group includes a first convex mirror, an optical path adjustment mirror and a second convex mirror in sequence. The laser emitted by the laser light source is irradiated onto the fluorescent wheel or the solid-state phosphor through the first convex mirror, the optical path adjustment mirror and the second convex mirror in sequence. The optical path adjustment mirror is used to change the direction of the optical path.

[0014] Furthermore, the optical path adjustment mirror is a reflecting mirror or a refracting mirror.

[0015] The beneficial effect of the utility model is that a solid-state phosphor and a moving device are arranged between the fluorescent wheel and the focusing lens group. When the fluorescent wheel needs to dissipate heat or fails, the moving device drives the solid-state phosphor to invade the light path and directly replace the fluorescent wheel. While avoiding the fluorescent wheel from burning out, the picture can still be displayed normally, thereby improving the service life of the fluorescent wheel. It can even be used alternately with the fluorescent wheel as needed to extend the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a laser projection device according to an embodiment of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of a laser projection device in another direction according to an embodiment of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of a moving device of a laser projection device according to an embodiment of the utility model;

[0019] Figure 4 It is a schematic diagram of the structure of a solid-state phosphor of a laser projection device according to an embodiment of the utility model.

[0020] Description of labels:

[0021] 100, laser light source; 200, focusing lens group; 210, first convex lens; 220, optical path adjustment lens;

[0022] 230, second convex mirror; 300, fluorescent wheel; 310, fluorescent ring; 400, solid-state fluorescent body;

[0023] 410, high temperature resistant base; 420, ceramic sheet; 430, phosphor layer; 500, mobile device;

[0024] 510, double-head motor; 511, first output shaft; 512, second output shaft; 513, gear;

[0025] 520, guide rail; 521, limit groove; 530, slide plate; 531, toothed belt; 532, baffle;

[0026] 600. High-speed rotating device. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model more clear, the following is a further detailed description of a laser projection device of the utility model in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0028] Please refer to Figure 1-Figure 4 A laser projection device includes a laser light source 100, a focusing lens group 200 and a fluorescent wheel 300. The laser emitted by the laser light source 100 forms a light spot through the focusing lens group 200. The laser projection device also includes a solid-state fluorescent body 400 and a moving device 500. The moving device 500 drives the solid-state fluorescent body 400 to move so that the solid-state fluorescent body 400 invades the light path so that the light spot is irradiated on the solid-state fluorescent body 400 or makes the solid-state fluorescent body 400 leave the light path so that the light spot is irradiated on the fluorescent wheel 300.

[0029] A solid-state phosphor 400 and a moving device 500 are arranged between the fluorescent wheel 300 and the focusing lens group 200. When the fluorescent wheel 300 needs to dissipate heat or fails, the moving device 500 drives the solid-state phosphor 400 to invade the optical path and directly replace the fluorescent wheel 300. While avoiding the fluorescent wheel 300 from burning out, the picture can still be displayed normally, thereby increasing the service life of the fluorescent wheel 300. It can even be used alternately with the fluorescent wheel 300 as needed to extend the service life of the equipment.

[0030] Please refer to Figure 4 The solid-state phosphor 400 includes a high-temperature resistant base 410 and a phosphor layer 430 attached to the high-temperature resistant base 410. Preferably, the high-temperature resistant base 410 is made of copper, aluminum, and alloys thereof, and materials such as silicon or silicon dioxide may also be selected as required. The high-temperature resistant base 410 can withstand high temperatures to ensure that the solid-state phosphor 400 does not deform or burn, and is used for heat dissipation.

[0031] Please refer to Figure 4, further comprising a ceramic sheet 420, a phosphor layer 430 attached to the ceramic sheet 420, and the ceramic sheet 420 fixed to a high temperature resistant base 410. By utilizing the microporous structure of the ceramic sheet 420, the phosphor can be better attached to the ceramic sheet 420 and can better dissipate heat. The process of attaching the phosphor to the ceramic sheet 420 is consistent with the process of making the fluorescent wheel 300, and the existing process can be used, which will not be repeated here. The ceramic sheet 420 can be formed on the high temperature resistant base 410 by co-firing, or it can be bonded by a high temperature resistant adhesive.

[0032] Preferably, the moving device 500 is a linear moving mechanism. In simple terms, a commonly used linear moving mechanism such as a ball screw, a belt slide, a slide block, etc. can be used as required, and the driving mechanism can be a motor or a cylinder as required.

[0033] In particular, please refer to Figure 3 The linear motion mechanism includes a double-headed motor 510, a guide rail 520 and a slide plate 530. One end of the double-headed motor 510 extends out of a first output shaft 511, and the other end extends out of a second output shaft 512. The first output shaft 511 and the second output shaft 512 are both connected with a gear 513. The slide plate 530 is slidably matched with the guide rail 520. Two toothed belts 531 are provided on the slide plate 530, one of which is meshed with the gear 513 on the first output shaft 511, and the other toothed belt 531 is meshed with the gear 513 on the second output shaft 512. The solid-state fluorescent body 400 is fixed on the slide plate 530. The solid-state fluorescent body 400 and the slide plate 530 can be fixed by screw connection, welding machine or clamping. The stability of movement can be ensured by the double gears 513 and the double toothed belts 531.

[0034] Please refer to Figure 3 There is also a limiting structure between the guide rail 520 and the slide plate 530. When the solid-state phosphor 400 moves to a position where the light spot irradiates the solid-state phosphor 400, the limiting structure makes the guide rail 520 abut against the slide plate 530. In particular, the limiting structure includes a limiting groove 521 provided on the guide rail 520 and a baffle 532 provided on the slide plate 530. When the slide plate 530 moves to a preset position (i.e., the position where the solid-state phosphor 400 replaces the fluorescent wheel 300), the baffle 532 abuts against the bottom of the limiting groove 521.

[0035] In particular, as another embodiment of the present invention, the moving device 500 is a rotating mechanism. It can be understood that the rotation center of the rotating mechanism is far away from the position where the solid-state phosphor 400 replaces the fluorescent wheel 300, that is, the rotating motor is connected to the solid-state phosphor 400 through a connecting rod. When the rotating mechanism is used, a Hall motor is preferably used to control the rotation angle so as to ensure that the solid-state phosphor 400 can accurately stop at the position replacing the fluorescent wheel 300. In particular, the Hall motor is located directly above the position where the solid-state phosphor 400 replaces the fluorescent wheel 300, so that the stop position can be better guaranteed under the influence of gravity.

[0036] Please refer to Figure 2 The fluorescent wheel 300 is connected to a high-speed rotating device 600. The fluorescent wheel 300 is connected to the high-speed rotating device 600 for heat dissipation. Generally, the fluorescent wheel 300 has a fluorescent ring 310, which is made of fluorescent powder. The light spot is hit at one position of the fluorescent ring 310. As the fluorescent wheel 300 rotates, the photoelectric spot hits a different point on the fluorescent ring 310 each time, thereby ensuring heat dissipation.

[0037] Please refer to Figure 1 and Figure 2 The focusing lens group 200 includes a first convex mirror 210, an optical path adjustment mirror 220, and a second convex mirror 230 in sequence. The laser emitted by the laser light source 100 is irradiated onto the fluorescent wheel 300 or the solid-state fluorescent body 400 through the first convex mirror 210, the optical path adjustment mirror 220, and the second convex mirror 230 in sequence. The optical path adjustment mirror 220 is used to change the direction of the optical path. Generally, the first convex mirror 210 is a collimating lens, and the second convex mirror 230 is a focusing lens. It can be understood that this scheme is only a simple optical path, and technicians in this field can change or expand it as needed.

[0038] Preferably, the optical path adjustment mirror 220 is a reflecting mirror or a refracting mirror.

[0039] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0040] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0041] In summary, the utility model provides a laser projection device in which a solid-state phosphor and a moving device are arranged between the fluorescent wheel and the focusing lens group. When the fluorescent wheel needs to dissipate heat or fails, the moving device drives the solid-state phosphor to invade the light path and directly replace the fluorescent wheel. While avoiding the fluorescent wheel from burning out, the picture can still be displayed normally, thereby improving the service life of the fluorescent wheel and can even be used alternately with the fluorescent wheel as needed to extend the service life of the equipment.

[0042] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A laser projection device, characterized in that: The invention comprises a laser light source, a focusing lens group and a fluorescent wheel. The laser light emitted by the laser light source forms a light spot through the focusing lens group. The invention also comprises a solid-state fluorescent body and a moving device. The moving device drives the solid-state fluorescent body to move so that the solid-state fluorescent body invades the optical path so that the light spot is irradiated on the solid-state fluorescent body or makes the solid-state fluorescent body leave the optical path so that the light spot is irradiated on the fluorescent wheel.

2. A laser projection device according to claim 1, characterized in that: The solid-state phosphor comprises a high-temperature resistant base and a phosphor layer attached to the high-temperature resistant base.

3. A laser projection device according to claim 2, characterized in that: It also includes a ceramic sheet, the phosphor layer is attached to the ceramic sheet, and the ceramic sheet is fixed on the high temperature resistant base.

4. The laser projection device according to claim 1, characterized in that: The moving device is a linear moving mechanism.

5. A laser projection device according to claim 4, characterized in that: The linear motion mechanism includes a double-headed motor, a guide rail and a slide plate. A first output shaft extends from one end of the double-headed motor and a second output shaft extends from the other end. Gears are connected to the first output shaft and the second output shaft. The slide plate slides with the guide rail. Two toothed belts are provided on the slide plate, one of which is meshed with the gear on the first output shaft and the other is meshed with the gear on the second output shaft. The solid-state phosphor is fixed on the slide plate.

6. A laser projection device according to claim 5, characterized in that: A limiting structure is further provided between the guide rail and the slide plate. When the solid-state fluorescent body moves to a position where the light spot irradiates the solid-state fluorescent body, the limiting structure causes the guide rail to abut against the slide plate.

7. The laser projection device according to claim 1, characterized in that: The moving device is a rotating mechanism.

8. The laser projection device according to claim 1, characterized in that: The fluorescent wheel is connected with a high-speed rotating device.

9. The laser projection device according to claim 1, characterized in that: The focusing lens group includes a first convex mirror, an optical path adjustment mirror and a second convex mirror in sequence. The laser emitted by the laser light source is irradiated onto the fluorescent wheel or the solid-state fluorescent body through the first convex mirror, the optical path adjustment mirror and the second convex mirror in sequence. The optical path adjustment mirror is used to change the direction of the optical path.

10. The laser projection device according to claim 9, characterized in that: The optical path adjustment mirror is a reflector or a refracting mirror.

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