CN219625860U

CN219625860U - Projection equipment

Info

Publication number: CN219625860U
Application number: CN202320553106.9U
Authority: CN
Inventors: 张笑群; 王衎; 潘文斌; 杨柳
Original assignee: Hangzhou Xichen Technology Co ltd
Current assignee: Hangzhou Xichen Technology Co ltd
Priority date: 2023-03-21
Filing date: 2023-03-21
Publication date: 2023-09-01
Anticipated expiration: 2033-03-21

Abstract

The present utility model relates to the field of laser illumination, projection and display. The projection equipment is characterized by comprising a circuit module, a heat dissipation module, a white light source module, a light condensation module, a film module, a mechanical lens barrel module and a projection objective module which are sequentially arranged; the white light source module generates white light by means of laser excited fluorescence, irradiates the film module after passing through the light condensing module, condenses light and eliminates chromatic aberration through the projection objective, and finally enlarges and images the pattern on the film at a designated position. The utility model has the characteristics of small volume, high brightness and long projection distance.

Description

Projection equipment

Technical Field

The present utility model relates to the field of laser illumination, projection and display.

Background

The projection lamp is a lamp which uses light to project pictures on a screen or a wall surface, and can project wanted patterns on the wall, the ground and other places to play roles of propaganda advertisement, decoration, warning and the like. The advertisement content on the film is projected to the outer wall of the high-rise building by using the optical principle, so that the outdoor advertisement with extremely rich visual impact is formed at night, and the market application prospect is wide.

However, most of the existing projection lamps use LEDs as light sources, and the projection distance is generally only several meters to tens of meters, and the brightness is insufficient, so that the projected image is unclear.

If the existing LED projection lamp is adopted to project the picture farther, the power of the LED can be greatly increased, the required heat dissipation area is greatly increased, and the volume of the projection lamp is overlarge; meanwhile, the LED has large optical expansion, light is difficult to collect from the optical point of view, and a large optical module is needed for realizing long-distance projection, so that the cost is increased exponentially.

Disclosure of Invention

The utility model provides a technical scheme for taking a white laser light source with high brightness as a projection light source, which solves the problems of insufficient brightness, too short projection distance, too large volume and the like of the existing projection equipment.

The utility model solves the problems according to the following technical proposal:

the projection equipment is characterized by comprising a circuit module, a heat dissipation module, a white light source module, a light condensation module, a film module, a mechanical lens barrel module and a projection objective module which are sequentially arranged; the white light source module generates white light by means of laser excited fluorescence, irradiates the film module after passing through the light condensing module, condenses light and eliminates chromatic aberration through the projection objective, and finally enlarges and images the pattern on the film at a designated position.

The white light source module comprises a laser diode, a beam shaping lens module, a diffusion sheet, a fluorescent sheet and a condensing lens which are sequentially arranged; the blue light emitted by the laser diode reaches the diffusion sheet to be further homogenized and amplified after passing through the beam shaping lens module, then enters the fluorescent sheet to excite fluorescence to generate white light, and then is output through the condensing lens.

Further, the laser diode emits blue light, the emission wavelength is between 420nm and 480nm, and the optical power is between 1W and 6W.

Further, the beam shaping lens module is composed of one or more optical lenses, and can be one or a combination of several of the following lenses according to the requirement: spherical lenses, aspherical lenses, cylindrical lenses, and free-form surface lenses.

Further, the diffusion sheet has a scattering angle of 0.5 to 10 degrees and a thickness of 0.2 to 1mm for incident light.

Further, the fluorescent sheet is formed by compounding a fluorescent material film and a sapphire sheet, absorbs blue light emitted by the laser diode and converts the blue light into white light, and the thickness of the fluorescent sheet is between 0.30mm and 1 mm.

Further, the heat dissipation module is composed of a plurality of metal heat dissipation surfaces and a fan.

Further, the light condensing module is formed by oppositely placing a pair of identical aspheric lenses.

Further, the film module is composed of a patterned glass sheet and a metal frame.

Further, the projection objective module is a doublet lens with a diameter of between 20mm and 50mm, a center thickness of between 5mm and 10mm, and a focal length of between 40mm and 120 mm.

Compared with the prior art, the utility model has the following beneficial effects:

(1) The utility model uses the white light source of laser excited fluorescence, the diameter of the light source luminous surface can be 0.2mm at minimum, and the utility model has the characteristics of small volume and high brightness.

(2) The white light source used by the utility model can have various assembly schemes, meets the requirements of different light spot sizes, light spot shapes and light spot energy, can be applied to a plurality of scenes, and has high degree of freedom.

(3) The optical principle of the projection lamp is the kohler illumination principle, and the white light source module is used together with the light condensing module and the projection objective lens, so that the projection distance is long and the light spots are uniform.

Drawings

Fig. 1 is a schematic view of a laser projection apparatus according to the present utility model. 1, a circuit module; 2. a heat dissipation module; 3. a white light source module; 4. a condensing module; 5. a film module; 6. a mechanical lens barrel module; 7. and a projection objective module.

Fig. 2 is a schematic structural view of a white light source module 3 in the laser projection device of the present utility model. 301, a laser diode; 302. a laser base; 303. a lens base; 304. a beam shaping lens module; 305. a diffusion sheet; 306. a fluorescent sheet base; 307. a fluorescent sheet; 308. a diaphragm; 309. a spherical lens; 310. a rubber ring; 311. and (5) pressing the ring.

Fig. 3 is a schematic view of the structure of the condensing module 4 in the laser projection device of the present utility model. Wherein 401, aspherical lens 1; 402. aspherical lens barrel; 403. an aspherical lens 2; 404. and (3) protecting glass.

Fig. 4 is a schematic view of the structure of a film module 5 in the laser projection device of the present utility model. Wherein 501, a stepper motor; 502. a film chassis; 503. glass film; 504. film fixing disc; 505. an optoelectronic switch circuit board; 506. an optoelectronic switch.

Fig. 5 is a schematic view of the structure of the projection objective module 7 in the laser projection device of the present utility model. 701, a projection object lens barrel; 702. a double cemented lens; 703. and (5) pressing the ring.

Fig. 6 is a schematic structural diagram of the heat dissipation module 2 in the laser projection device of the present utility model. 201, a fan outer cover; 202. a heat radiation fan; 203. a heat sink.

Detailed Description

In order to more clearly illustrate the present utility model, the present utility model will be further described with reference to preferred embodiments and the accompanying drawings. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this utility model is not limited to the details given herein.

Referring to fig. 1, the projection apparatus includes a circuit module (1), a heat dissipation module (2), a white light source module (3), a condenser module (4), a film module (5), a mechanical lens barrel module (6) and a projection objective module (7) which are sequentially arranged. The white light source module (3) generates white light by means of laser excited fluorescence, irradiates the white light to the film module (5) after passing through the light condensing module (4), condenses light and eliminates chromatic aberration after passing through the projection objective module (7), and finally enlarges and images the pattern on the film at a designated position. The optical principle here is kohler illumination principle, the aperture of the imaging objective beam is limited by the field stop of Ke Lejing, and the field stop is the aperture stop of the imaging objective. Ke Lejing the aperture stop limits the field of view of the imaging objective, which is the field stop of the imaging objective. That is, kohler illumination is a "window-to-pupil, pupil-to-window" structure that can make the illuminance uniform.

Let the brightness of the light source beThe transmittance of the aspherical lens is k ₁ The transmittance of the projection objective is k ₂ The diameter D of the projection lens, the projection distance L omega ^′ The brightness E of the projected image can be expressed as follows for the angle of field of the image

As can be seen from the above equation, the brightness E of the projected image is proportional to the brightness of the light source; by reducing the size of the light emitting surface of the light source, the brightness of the light source can be increased, thereby increasing the brightness of the projected image. Because the laser beam from the laser diode is extremely tiny, the area of the laser beam which irradiates the fluorescent sheet to excite the fluorescent light to emit light again is very small, the brightness of the white light source is extremely high, and the maximum brightness of the central point is up to 1000Mcd/m ² 。

Example 1: referring to fig. 2, a laser diode (301) with an optical power of 5w is pressed into a laser base (302) by back-pressing, so as to prevent the laser diode from being biased to cause misalignment of light spots. Because the light beams directly coming out of the laser diode have different divergence angles in two different directions of a fast axis and a slow axis, the light beams need to be shaped so as to ensure that light spots irradiated on the fluorescent sheet are uniform and symmetrical. The beam shaping uses an aspherical lens (304) mounted on a lens mount (303). A diffuser (305) is placed after the lens (304) to further homogenize the laser beam. The diffusion sheet (305) is mounted on one surface of the fluorescent sheet base (306). A fluorescent ceramic sheet (307) is arranged on the other surface of the base (306). Blue laser light from the laser diode excites phosphor in the phosphor ceramic plate (307) and the resulting yellow light mixes with unabsorbed blue light to form white light. The white light passes through a diaphragm (308), some stray light is eliminated, and finally the light is collimated and emitted through a spherical lens (309). The lens (309) is fixed by a rubber ring (310) and a press ring (311).

The relationship between the luminous flux and the center luminance of the white laser light source of example 1 and the applied current is shown in table 1.

I(A)	U(V)	φ(lm)	Center luminance (cd/mm) ² )
				1	3.90	254.48	292
2	4.26	572.67	650
				3	4.53	823.10	885

TABLE 1 white laser light Source luminous flux and center Brightness test data of EXAMPLE 1

The illuminance and spot size of the white laser light source of example 1 at various distances at an applied current of 3A are shown in table 2.

Distance (m)	Illuminance (lx)	Diameter of light spot (m)
			2	225984	0.04
5	48217	0.12
			11	10211	0.30

TABLE 2 illuminance and spot size at different distances for the white laser light source of EXAMPLE 1

Example 2: referring to fig. 3, the condensing module includes aspheric lenses (401), (403) and a lens barrel (402), and the two aspheric lenses are completely identical in geometry and material and are respectively disposed at two sides of the lens barrel (402), so that the condensing effect is achieved and the light energy utilization rate of the light source is increased.

Referring to fig. 4, a stepper motor (501) can be added to the projection lamp to drive the film tray for automatic film replacement, so as to remotely control film replacement. The photoelectric switch (50) carries out zero-resetting detection at the moment of powering on, so that the projection film (503) is ensured to be in the middle of the light path, and the number of films on the film tray is matched with the stepping angle of the stepping motor.

Referring to fig. 5, a doublet lens (702) is placed in a projection lens barrel (701) and fixed by a clamp ring (703). The projection objective tube bottom is internally provided with threads, and the projection distance can be adjusted. Referring to fig. 6, to ensure necessary heat dissipation, the white laser light source 3 is disposed in the heat sink 203 and used together with the heat dissipation fan 202 to accelerate heat dissipation, stabilize the white laser light source, and reduce the required heat dissipation area and the overall structural size.

The test data for illumination and projected image size for the projection device described in example 2 at different distances is shown in table 3.

TABLE 3 illuminance and image size test data for projection apparatus at different throw distances as described in example 2

Those skilled in the art will appreciate that the embodiments of the utility model described above and shown in the drawings are by way of example only and not by way of limitation. The objects of the present utility model have been fully and effectively achieved. The functional and structural principles of the present utility model have been shown and described in the examples and embodiments of the utility model may be modified or practiced without departing from the principles described.

Claims

1. The projection equipment is characterized by comprising a circuit module, a heat dissipation module, a white light source module, a light condensation module, a film module, a mechanical lens barrel module and a projection objective module which are sequentially arranged; the white light source module generates white light by means of laser excited fluorescence, irradiates the film module after passing through the light condensing module, condenses light and eliminates chromatic aberration through the projection objective, and finally enlarges and images the pattern on the film at a designated position.

2. The projection device of claim 1, wherein the white light source module comprises a laser diode, a beam shaping lens module, a diffusion sheet, a fluorescent sheet and a condensing lens which are arranged in sequence; the blue light emitted by the laser diode reaches the diffusion sheet to be further homogenized and amplified after passing through the beam shaping lens module, then enters the fluorescent sheet to excite fluorescence to generate white light, and then is output through the condensing lens.

3. A projection device as claimed in claim 2, characterized in that the laser diode emits blue light at a wavelength of between 420 and 480nm and at an optical power of between 1 and 6W.

4. A projection device as claimed in claim 2, wherein the beam shaping lens module is composed of one or more optical lenses, and may be one or a combination of the following lenses as required: spherical lenses, aspherical lenses, cylindrical lenses, and free-form surface lenses.

5. A projection device as claimed in claim 2, wherein the diffuser has a scattering angle of between 0.5 and 10 degrees and a thickness of between 0.2 and 1mm for incident light.

6. A projection device as claimed in claim 2, wherein the phosphor sheet is formed by combining a phosphor film with a sapphire sheet, absorbs blue light emitted from the laser diode and converts the blue light into white light, and has a thickness of between 0.30mm and 1 mm.

7. The projection device of claim 1, wherein the heat dissipating module comprises a plurality of metal heat dissipating surfaces and a fan.

8. A projection device as claimed in claim 1, wherein the condensing module is formed by a pair of identical aspherical lenses disposed opposite each other.

9. The projection device of claim 1 wherein the film module is comprised of a patterned glass sheet and a metal frame.

10. A projection device as claimed in claim 1, characterized in that the projection objective module is a doublet lens having a diameter of between 20mm and 50mm, a central thickness of between 5mm and 10mm and a focal length of between 40mm and 120 mm.