CN102819174A - Laser projection system - Google Patents

Abstract

The invention relates to a laser projection system, which comprises a laser module, red, green and blue fluorescent bodies, a first collimating lens, a second collimating lens, a third collimating lens, a prism and a scanning system lens. The laser module has at least one single-wavelength laser light source as a light source. The red, green and blue phosphors are excited by the first wavelength laser source to emit red, green and blue light, respectively. The first, the second and the third collimating lens are respectively arranged on the paths of the red light, the green light and the blue light for enabling the red light, the green light and the blue light to be parallel beams of the red light, the green light and the blue light respectively. The prism refracts the red light parallel beam, the green light parallel beam and the blue light parallel beam. The scanning system lens projects the red light parallel beam, the green light parallel beam and the blue light parallel beam from the prism to an imaging plane to form an imaging picture.

Description

laser projection system

technical field

The present invention relates to a laser projection system, in particular to a laser projection system using a single-wavelength laser light source.

Background technique

Existing projection devices mostly adopt halogen or electric arc bulb light sources. Although this type of light source has the advantage of high luminance, it has many disadvantages, such as large power consumption, high operating temperature, short lamp life and high price, and the size and weight cannot be further reduced due to heat dissipation. In recent years, related industries have also begun to develop laser projection equipment using laser light as a light source. If a projector using a laser light source as a light source has a simple structure and high color reproducibility. In addition, because it does not require a considerable volume and weight of the heat dissipation module due to the heat dissipation problem of conventional projectors using halogen bulbs, the projector can be further miniaturized. All in all, compared with existing projectors using halogen bulbs, laser projectors have the advantages of being thinner, smaller, and projected images with better color reproducibility.

However, existing projection systems traditionally use three complementary constituent colors to represent full-color images, and therefore basically require three primary color light sources. Projectors using laser light sources as light sources are also being developed based on this concept. For example, red, blue, and green laser light sources need to be used to generate red, blue, and green laser beams respectively. However, the use of three-color laser beams still occupies a certain volume, and the beams of each color need to go through complex processing steps such as intensity distribution conversion, light combination, reconciliation, speckle elimination, diffraction splitting, and grating reduction before they can be ideal. projection light source. Therefore, it is necessary to develop a laser projection system using a single wavelength light source.

Contents of the invention

The technical problem to be solved by the present invention is to provide a laser projection system whose laser module only uses a single-wavelength laser The light source can simplify the laser projection system, reduce the volume and reduce the cost.

The technical solution adopted by the present invention to solve the technical problem is: provide a laser projection system, including a laser module, red, green and blue phosphors, first, second and third collimating lenses, prisms and Scan system lens. The laser module has at least one single-wavelength laser light source as a light source. The red, green and blue phosphors are respectively excited by the first wavelength laser light source to emit red light, green light and blue light. The first, second and third collimating lenses are respectively arranged on the emission paths of red light, green light and blue light to make red light, green light and blue light become parallel beams of red light, green light and blue light respectively. The prism refracts parallel beams of red light, parallel beams of green light and parallel beams of blue light. The scanning system lens projects the parallel beams of red light, green light and blue light from the prism to the imaging plane to form an imaging picture.

The laser projection system implementing the present invention has the following beneficial effects: only a single-wavelength laser light source is used, without the many shortcomings of the aforementioned prior art, which makes the structure of the laser projection system simpler, with fewer components and lower manufacturing costs. Low. In addition, due to the simple structure and high color reproducibility, image quality can be further improved.

Description of drawings

FIG. 1 shows a functional diagram of the laser projection system of the present invention.

Detailed ways

Please refer to FIG. 1 , which shows a functional diagram of the laser projection system of the present invention. The laser projection system of the present invention includes a laser module 10, a collimating lens 20-1, a collimating lens 20-2, a collimating lens 20-3, a red phosphor 30-1, a green phosphor 30-2, a blue phosphor Body 30-3, first collimating lens 40-1, second collimating lens 40-2, third collimating lens 40-3, first lens 50-1, second lens 50-2, third lens 50 -3. The prism 60 , the two-axis scanning control device 70 and the scanning system lens 80 .

The laser module 10 includes a single-wavelength laser light source 10-1, a single-wavelength laser light source 10-2, and a single-wavelength laser light source 10-3, corresponding to the red phosphor 30-1, the green phosphor 30-2, and the blue phosphor The bodies 30-3 respectively generate desired laser beams. The laser projection system of the present invention further includes three collimating lenses, which are respectively arranged on the single-wavelength laser light source 10-1, the single-wavelength laser light source 10-2, the single-wavelength laser light source 10-3 and the red phosphor 30-1. , the green phosphor 30-2, and the blue phosphor 30-3, so that the laser beams generated by the single-wavelength laser light source 10-1, the single-wavelength laser light source 10-2, and the single-wavelength laser light source 10-3 are collected After the beam becomes a parallel light beam, the red phosphor 30-1, the green phosphor 30-2, and the blue phosphor 30-3 are irradiated.

When the red phosphor 30-1, the green phosphor 30-2, and the blue phosphor 30-3 are respectively the single-wavelength laser light source 10-1, the single-wavelength laser light source 10-2, and the single-wavelength laser light source 10-3 When excited, they emit red light, green light and blue light respectively.

The first collimating lens 40-1, the second collimating lens 40-2, and the third collimating lens 40-3 are respectively placed on the path of red light, green light and blue light radiation, in order to make the aforementioned red light, green light And blue light becomes parallel beams of red light, parallel beams of green light and parallel beams of blue light. Moreover, in the embodiment of the present invention, as shown in the figure, the red light, green light and blue light are used on the path of radiation, and the first mirror 50-1 in front of the prism 60 makes the red light penetrate and reflects the green light and Blu-ray. The second lens 50 - 2 arranged on the emission path of the green light and the blue light and in front of the prism 60 makes the blue light pass through and reflects the green light. The blue light is reflected by the third lens 50 - 3 arranged on the path of the blue light emission and reflected on the prism 60 . However, the present invention is not limited thereto, and the positions of the first lens 50 - 1 , the second lens 50 - 2 and the third lens 50 - 3 need to be changed according to the design.

As shown in the figure, the prism 60 of the present invention is used to receive parallel beams of red light, parallel beams of green light and parallel beams of blue light passing through the first lens 50-1, the second lens 50-2 and the third lens 50-3, and The parallel beams of red light, green light and blue light are refracted to project to the scanning system lens 80 . The scanning system lens 80 projects the parallel beams of red light, green light and blue light from the prism 60 to an imaging plane 90 , such as a screen. The two-axis scanning control device 70 of the present invention uses a mechanical or electronic system control method (not shown in the figure) to control the refraction angle of the prism 60 and the projection angle of the scanning system lens 80, and directs the projection of red parallel beams. , the projection angles of the parallel beams of green light and the parallel beams of blue light to the imaging plane 90, and complete two-axis (X, Y axis) scanning of the imaging plane 90 can form an imaging picture according to an external input image signal.

It is worth mentioning that the present invention only uses a laser light source of a single wavelength, such as ultraviolet light. Therefore, without the many disadvantages of the aforementioned prior art, the structure of the laser projection system is simpler, the number of components is less, and the manufacturing cost is lower. In addition, due to the simple structure and high color reproducibility, image quality can be further improved.

Although the present invention has been disclosed above with respect to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which the present invention belongs can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be determined by what is defined by the claims.

Claims (7)

1. a laser optical projection system is characterized in that, comprising:

Laser module has at least one single wavelength laser light source, with the light source as this laser optical projection system;

Red-emitting phosphors is for this first wavelength laser light source excites, to radiate ruddiness;

Green-emitting phosphor is for this first wavelength laser light source excites, to radiate green glow;

Blue emitting phophor is for this first wavelength laser light source excites, to radiate blue light;

First collimation lens is arranged on the path of this ruddiness radiation, with so that this ruddiness becomes the ruddiness parallel beam;

Second collimation lens is arranged on the path of this green glow radiation, with so that this green glow becomes the green glow parallel beam;

The 3rd collimation lens is arranged on the path of this blue light radiation, with so that this blue light becomes the blue light parallel beam;

Prism receives this ruddiness parallel beam, this green glow parallel beam and this blue light parallel beam, and reflects this ruddiness parallel beam, this green glow parallel beam and this blue light parallel beam; And

The scanning system lens, in order to projection from this ruddiness parallel beam, this green glow parallel beam and this blue light parallel beam of this prism to imaging plane, to be formed into the picture picture.

2. laser optical projection system as claimed in claim 1; It is characterized in that; More comprise at least one collimation lens; Be arranged at respectively between those single wavelength laser light source and this red-emitting phosphors, this green-emitting phosphor and this blue emitting phophor,, expose to this red-emitting phosphors, this green-emitting phosphor and this blue emitting phophor with so that those first wavelength laser light source produce parallel beam.

3. laser optical projection system as claimed in claim 1; It is characterized in that; More comprise two scan controllers, the crevice projection angle when controlling this ruddiness parallel beam of this scanning system lens projects, this green glow parallel beam and this blue light parallel beam to this imaging plane.

4. laser optical projection system as claimed in claim 1 is characterized in that, comprises that more first eyeglass is arranged on the path of this ruddiness, this green glow and the radiation of this blue light, and before this prism, with so that this ruddiness penetrates, reflects this green glow and blue light.

5. laser optical projection system as claimed in claim 1 is characterized in that, comprises that more second eyeglass is arranged on the path of this green glow and the radiation of this blue light, and before this prism, with so that this blue light penetrates, reflects this green glow.

6. laser optical projection system as claimed in claim 1 is characterized in that, comprises that more prismatic glasses is arranged on the path of this blue light radiation, and before this prism, in order to reflect this blue light.

7. laser optical projection system as claimed in claim 1 is characterized in that, wherein this single wavelength laser light source is a ultraviolet light.