CN110764355A

CN110764355A - Laser projection light path structure

Info

Publication number: CN110764355A
Application number: CN201911085310.7A
Authority: CN
Inventors: 郭鹏; 孙玉琼; 张军
Original assignee: Zhuhai Da Sheng Yun Vision Media Technology Co Ltd
Current assignee: Zhuhai Da Sheng Yun Vision Media Technology Co Ltd
Priority date: 2019-11-08
Filing date: 2019-11-08
Publication date: 2020-02-07

Abstract

The invention provides a laser projection light path structure, comprising: the device comprises a concave lens, a light homogenizing sheet A, a dynamic dichroic sheet, a rotating shaft, a rotating motor, a condensing lens A, a fluorescent wheel B and a condensing lens D; the dynamic dichroic sheet can reflect blue light rays to enable yellow light rays and green light rays to pass through, the rotating motor is connected with the dynamic dichroic sheet through a rotating shaft to enable the dynamic dichroic sheet to be switched between a first station and a second station in a frequent reversing mode, and fluorescent media are arranged on the whole circumference of a wheel disc of the fluorescent wheel B. According to the invention, by introducing the dynamic dichroic sheet adjusting mechanism, the light path design is simplified, the system space and the lens cost are saved, the light path of blue excitation light is shortened, the loss of blue light intensity is reduced, and the system display brightness is improved.

Description

Laser projection light path structure

Technical Field

The invention mainly relates to the technical field of optics, in particular to a laser projection light path structure.

Background

In the design of the projection light path of the monochromatic laser light source, light beams emitted by the monochromatic laser light source strike a fluorescent medium of the fluorescent wheel to excite other colored light, the excited heterochromatic light is reflected by the fluorescent wheel and then continuously enters a subsequent light path, and in order to enable the excitation light and the heterochromatic light to be converged together, a light path needs to be additionally designed for the excitation light to be transmitted. Therefore, the light path design is complex, the number of lenses used in the light path is large, the system cost is increased, the excitation light energy is attenuated due to the overlong excitation light path, the brightness is reduced, and the final projection imaging brightness is influenced.

As shown in fig. 1 and 2, the propagation path of the conventional monochromatic laser projection light path is divided into two parts, one part is the propagation path of yellow and green light, after the blue excitation light is emitted from the light source, it firstly passes through the concave lens 1, then passes through the light homogenizing plate a2, then it irradiates to the dichroic plate 3 which can reflect the blue light, and passes through the yellow and green light, the blue excitation light is reflected by the dichroic plate 3, and deflects 90 ° with the original propagation path, and irradiates to the condenser lens a11, then it is refracted, the light is further converged and emitted to the fluorescent wheel a12, the fluorescent wheel a12 comprises an excitation part coated with fluorescent medium and a full transparent glass part not coated with fluorescent medium, if the blue excitation light irradiates to the fluorescent wheel a12, the excitation light just irradiates to the fluorescent medium of the excitation part, the yellow and green light generated by the excitation of the fluorescent medium are reflected from the aluminum substrate on the surface of the fluorescent wheel back to the condenser, the light beam is refracted by the lens and then irradiates the dichroic plate 3, and can be transmitted from the dichroic plate 3 because the light beam at the moment is changed into yellow and green light, and the light beam does not change the propagation path through the dichroic plate 3, finally exits to the condenser lens D4 and enters a subsequent light path through refraction. The other part of the traditional monochromatic laser projection light path is a blue light propagation path, the propagation path of the blue light is consistent with the propagation paths of yellow and green light before the light beam reaches the fluorescent wheel A12, when the blue excitation light reaches the fluorescent wheel A12, if the fluorescent wheel A12 rotates to the full transparent glass part and contacts with the excitation light, the blue excitation light will penetrate the full transparent glass on the fluorescent wheel A12 and irradiate on the condenser lens B9, the light is refracted by the condenser lens B9 and then emitted to the reflector A10, after being reflected by the reflector A10, the light path propagation path deflects at 90 degrees, the light beam emits to the condenser lens C8, the condenser lens C8 refracts the excitation light and then emits to the reflector B7, after being reflected by the reflector B7, the light path deflection is carried out at 90 degrees, the light beam emits to the reflector C6, after being reflected by the reflector C6, the light path propagation path deflects at 90 degrees, the light beam is emitted to the light uniformizing sheet B5, then to the dichroic sheet 3, because the light beam is blue light at this time, after being reflected by the dichroic sheet 3, the light path propagation path is deflected by 90 °, and finally the blue excitation light beam is emitted to the condenser lens D4, and enters the subsequent light path after being refracted.

As can be seen from the above, although the blue excitation light path in the conventional monochromatic laser projection light path overlaps with the paths of the excited yellow and green lights, the whole light paths are not consistent, especially the blue excitation light path is long, and the loss of brightness is severe after the reflection and refraction by the lenses for many times, which affects the projection performance (brightness and color) of the monochromatic laser projection system.

Disclosure of Invention

In order to solve the defects that the light path of exciting light is inconsistent with that of excited light in the traditional monochromatic laser light source projection light path design, the overall light emitting efficiency of the light path is influenced, and the system cost is increased due to the complex light path design, the invention combines the prior art and starts from practical application to provide a laser projection light path structure.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a laser projection light path structure, comprising: the device comprises a concave lens, a light homogenizing sheet A, a dynamic dichroic sheet, a rotating shaft, a rotating motor, a condensing lens A, a fluorescent wheel B and a condensing lens D;

the dynamic dichroic sheet can reflect blue light rays to enable yellow light rays and green light rays to pass through, the rotating motor is connected with the dynamic dichroic sheet through a rotating shaft to enable the dynamic dichroic sheet to be frequently switched in a reversing mode between a first station and a second station, and fluorescent media are arranged on the whole circumference of a wheel disc of the fluorescent wheel B;

when the dynamic dichroic sheet is positioned at a first station, blue exciting light is emitted from a light source, is refracted by a concave lens and then is emitted to a light-equalizing sheet A, then is emitted to the dynamic dichroic sheet from the light-equalizing sheet A, the dynamic dichroic sheet reflects blue light beams to enable the blue light beams to deflect at 90 degrees to enter a condensing lens A, and is emitted to a fluorescent wheel B after being refracted by the condensing lens A, the blue light beams are excited by a fluorescent medium to become yellow and green light beams, the yellow and green light beams are reflected by the fluorescent wheel B to be emitted to the condensing lens A again, are emitted to the dynamic dichroic sheet after being refracted, are transmitted to the condensing lens D through the dynamic dichroic sheet, and enter a subsequent light path through the condensing lens D;

when the dynamic dichroic sheet is positioned at the second station, the blue excitation light is emitted from the light source, is refracted by the concave lens and then is emitted to the light homogenizing sheet A, then is emitted to the dynamic dichroic sheet from the light homogenizing sheet A, and the dynamic dichroic sheet reflects the blue light beam to enable the blue light beam to deflect at 90 degrees to enter the condensing lens D, and then enters a subsequent light path through the condensing lens D.

The invention has the beneficial effects that:

after the dynamic dichroic film is introduced, the light propagation path of the blue light beam is obviously shortened, the system is simplified to a great extent, the light intensity loss is greatly reduced due to the reduction of the number of the lenses participating in reflection and refraction, and the light intensity of the light beam is improved.

Drawings

FIG. 1 is a layout structure of a projection light path of a conventional monochromatic laser light source;

FIG. 2 is a schematic structural view of a fluorescent wheel A;

FIG. 3 is a block diagram of the present invention;

FIG. 4 is a schematic structural view of a fluorescent wheel B according to the present invention;

fig. 5 is a diagram showing the layout of the optical paths according to the present invention.

Reference numerals shown in the drawings:

1. concave lens 2, dodging slices A, 3, dichroic slices, 4, condenser lenses D, 5, dodging slices B, 6, reflectors C, 7, reflectors B, 8, condenser lenses C, 9, condenser lenses B, 10, reflectors A, 11, condenser lenses A, 12, fluorescent wheels A, 13, dynamic dichroic slices, 14, dynamic dichroic slice rotating shafts, 15, rotating motors, 16 and fluorescent wheels B.

Detailed Description

The invention is further described with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the present application.

As shown in fig. 3, the improved structure of the light path of the laser projection of the present invention includes a concave lens 1, a light homogenizing sheet a2, a dynamic dichroic sheet 13, a dynamic dichroic sheet rotating shaft 14, a rotating motor 15, a condenser lens a11, a fluorescent wheel B16, and a condenser lens D4.

As shown in fig. 4, the fluorescence wheel B16 is different from the fluorescence wheel a12 in that the fluorescence wheel B16 has no full transparent glass without the fluorescent medium coated thereon, and the fluorescence wheel B16 has the fluorescent medium disposed all around the wheel. The dynamic dichroic plate 13 is connected to a rotary motor 15 via a dynamic dichroic plate rotary shaft 14 fixed thereto. The dynamic dichroic plate 13 is also a glass sheet that allows only yellow and green light to pass through and reflects blue light.

In the optical path structure of the present invention, when the rotating motor 15 drives the dynamic dichroic sheet 13 to rotate to the position shown in fig. 5(a), the blue excitation light is emitted from the light source, refracted by the concave lens 1 and then emitted onto the light uniformizing sheet a2, and then emitted from the light uniformizing sheet a2 to the dynamic dichroic sheet 13, since the light beam is blue at this time, the dynamic dichroic sheet 13 reflects the light beam, the light path of the blue light beam is deflected by 90 ° and enters the condenser lens a11, and is refracted by the condenser lens a11 and then emitted to the fluorescent wheel B16, the blue excitation light is excited by the fluorescent medium to become yellow and green light, and is reflected by the fluorescent wheel B16 and again enters the condenser lens a11, and is refracted and then emitted to the dynamic dichroic sheet 13, since the returned light beam is yellow and green light beam at this time, the blue excitation light beam can directly transmit through the dynamic dichroic sheet 13 and enter the condenser lens D4, and further.

When the rotating motor drives the dynamic dichroic plate to rotate to the position shown in fig. 5(B), the blue excitation light is emitted from the light source and enters the concave lens 1, is refracted and then is emitted to the light uniformizing plate a2, and the light beam is emitted from the light uniformizing plate a2 and then is irradiated to the dynamic dichroic plate 13, because the color of the light beam is blue, the light beam can be reflected by the dynamic dichroic plate 13, and the light path propagation path of the blue light beam is deflected by 90 degrees and is emitted to the condenser lens D4, and then enters the subsequent light path.

In the improved light path structure of the invention, the light emitting ratio of the blue light, the yellow light and the green light emitted to the subsequent light path is controlled by two aspects. On one hand, the light emitting proportion of yellow light and green light can be controlled by adjusting the area proportion of yellow and green fluorescent media on the fluorescent wheel B16 to the fluorescent wheel disc; on the other hand, the time that the dynamic dichroic filter 13 is in the position of fig. 5(a) and the position of fig. 5(B) can be controlled by adjusting the rotating motor 15, and the longer the time in the illustrated position, the higher the proportion of the light beam of the corresponding color entering the subsequent optical path. When the rotating motor 15 controls the dynamic dichroic filter to be in the rotating process, and not in the position shown in fig. 5(a) or the position shown in fig. 5(B), the laser light source is turned off for a short time to emit no light, so as to control the stability of the color and angle of the light beam in the subsequent light path.

In conclusion, after the dynamic dichroic filter is introduced, the light propagation path of the blue light beam is obviously shortened, the system is greatly simplified, the light intensity loss is greatly reduced due to the reduction of the number of the lenses participating in reflection and refraction, and the light intensity of the light beam is improved.

Claims

1. A laser projection optical path structure, comprising: the device comprises a concave lens, a light homogenizing sheet A, a dynamic dichroic sheet, a rotating shaft, a rotating motor, a condensing lens A, a fluorescent wheel B and a condensing lens D;