Light source light path system for laser projection

Abstract

The utility model relates to a light source light path system for laser projection, which comprises a laser light source module capable of emitting red, green and blue light beams, and a spectroscope capable of transmitting one primary color light beam and reflecting the other two primary color light beams is arranged in front of the laser light source module. A first reflecting mirror capable of reflecting transmission light beams of the spectroscope is arranged on a transmission light path of the spectroscope, a second reflecting mirror capable of reflecting light beams reflected by the first reflecting mirror is arranged on a reflecting light path of the first reflecting mirror, and a reflecting light path of the second reflecting mirror coincides with a reflecting light path of the spectroscope. The device is characterized in that light beams with different colors are separated and guided through the arrangement of the spectroscope, the first reflecting mirror and the second reflecting mirror, and the light beams penetrating through the spectroscope are enabled to coincide with light paths of the light beams reflected by the spectroscope after being reflected, so that the accuracy of color superposition is improved, more accurate light beam alignment is realized, and the quality of the light beams is improved. The high-definition requirement of a user is met, and the use experience of the user is improved.

Description

[Technical field]

[0001] The utility model relates to the field of projection display, in particular to a light source optical path system of laser projection. [Background technology]

[0002] Laser projection technology is a projection display technology that uses laser as a light source. Compared with traditional bulb or LED light source projection technology, laser projection technology can provide higher brightness output and wider color gamut, making the projected image more colorful and saturated, and improving the visual experience.

[0003] However, in traditional red, green and blue laser projection, there is a common problem that the red, green and blue laser beams are not easy to completely overlap. In particular, in the laser light products provided by some laser light suppliers, the three-color lasers fail to meet the ideal beam alignment standard, and there is a certain degree of spatial separation from the beginning, which leads to uneven color of the picture, fails to meet the user's demand for picture quality, and affects the user experience. [Utility Model Content]

[0004] The utility model aims to provide a light source optical path system for laser projection, so as to solve the problem of uneven picture color caused by the three-color laser of the laser lamp failing to achieve the ideal beam alignment standard.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a light source optical path system for laser projection, comprising a laser light source module capable of emitting red, green and blue light beams, a beam splitter capable of transmitting one primary color light beam and reflecting other two primary color light beams is arranged in front of the laser light source module, a first reflector capable of reflecting the transmitted light beam of the beam splitter is arranged on the transmitted light path of the beam splitter, a second reflector capable of reflecting the light beam reflected by the first reflector is arranged on the reflected light path of the first reflector, and the reflected light path of the second reflector coincides with the reflected light path of the beam splitter.

[0006] As a further optimization scheme of the utility model, there is an incident angle A between the beam splitter and the incident light path, there is an incident angle B between the first reflector and the transmitted light path of the beam splitter, there is an incident angle C between the second reflector and the reflected light path of the first reflector, and the relationship among the incident angle A, incident angle B and incident angle C is A+B+C=90°.

[0007] As a further optimization solution of the present invention, the incident angle A is 45°.

[0008] As a further optimization solution of the utility model, the beam splitter is a color-dividing reflector capable of reflecting green light and red light and transmitting blue light, and the first reflector and the second reflector are blue-reflecting mirrors capable of reflecting blue light.

[0009] As a further optimization solution of the utility model, the beam splitter is coated with a beam splitter film which can transmit light beams in the frequency band of 440nm to 490nm and can reflect light beams in the frequency band of 510nm to 540nm.

[0010] As a further optimization solution of the utility model, the first reflector and the second reflector are coated with a high-reflection film capable of reflecting light beams in the frequency band of 440nm to 490nm.

[0011] As a further optimization solution of the present invention, the thickness of the beam splitter is 0.6 mm to 0.8 mm.

[0012] Compared with the prior art, the utility model has the following advantages: through the setting of the beam splitter, the first reflector, and the second reflector, light beams of different colors are separated and guided, and the light beam passing through the beam splitter is made to coincide with the light path of the light beam reflected by the beam splitter after reflection, thereby improving the accuracy of color superposition, so as to achieve more precise light beam alignment, meet the user's demand for high image quality, and enhance the user's experience.

Brief Description of the Drawings

[0013] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0014] Figure 1 This is one of the structural diagrams of the utility model;

[0015] Figure 2 This is the second structural diagram of the utility model;

[0016] Figure 3 This is a reflectivity data diagram of the beam splitting film in the utility model;

[0017] Figure 4 This is a reflectivity data diagram of the high reflective film in the utility model. [Specific implementation method]

[0018] The implementation modes of the present utility model are described in detail below in conjunction with the accompanying drawings.

[0019] like Figures 1 to 4As shown, the utility model discloses a light source optical path system for laser projection, including a laser light source module 1 capable of emitting red, green and blue light beams, a beam splitter 2 capable of transmitting one primary color light beam and reflecting other two primary color light beams is arranged in front of the laser light source module 1, a first reflector 3 capable of reflecting the transmitted light beam of the beam splitter 2 is arranged on the transmission light path of the beam splitter 2, a second reflector 4 capable of reflecting the light beam reflected by the first reflector 3 is arranged on the reflection light path of the first reflector 3, and the reflection light path of the second reflector 4 coincides with the reflection light path of the beam splitter 2.

[0020] The laser light source module 1 uses laser as a light source, which has higher brightness, wider color gamut and longer service life than traditional light sources, thereby improving the user's visual experience. The laser light source module 1 generates red, green and blue laser beams to form the basic elements of image color composition. The beam splitter 2 is located in front of the laser light source module 1, and can selectively transmit a light beam of one color and reflect the light beams of the other two colors at the same time, so that the light beams of different colors are propagated separately according to a preset path, thereby controlling the direction of light beams of different colors. The first reflector 3 is located on the transmission light path of the beam splitter 2, and is responsible for reflecting the light beam transmitted by the beam splitter 2 and adjusting its propagation direction. The second reflector 4 reflects the light beam reflected by the first reflector 3, and the reflection path of the second reflector 4 coincides with the light path of the other color light beams reflected by the beam splitter 2. Through the cooperation of the first reflector 3 and the second reflector 4, the calibration of the beam overlap is completed, the color mixing efficiency and uniformity are improved, the color distortion caused by the misalignment of the light beam is reduced, and the image quality is improved.

[0021] In one embodiment, the length of the reflected light path of the first reflector 3 can be changed by adjusting the front and rear positions of the second reflector 4, thereby adjusting the relative position between the reflected light beam emitted by the second reflector 4 and the reflected light beam from the beam splitter 2, thereby achieving precise spatial overlap of the two light beams.

[0022] By setting the beam splitter 2, the first reflector 3, and the second reflector 4, light beams of different colors are separated and guided, and the light beam passing through the beam splitter 3 is made to coincide with the light path of the light beam reflected by the beam splitter 3 after reflection, thereby improving the accuracy of color superposition, achieving more accurate beam alignment, meeting the user's demand for high image quality, and improving the user's experience.

[0023] There is an incident angle A between the beam splitter 2 and the incident light path, there is an incident angle B between the first reflector 3 and the transmitted light path of the beam splitter 2, there is an incident angle C between the second reflector 4 and the reflected light path of the first reflector 3, and the relationship among the incident angles A, B and C is A+B+C=90°.

[0024] The incident angle A determines the direction of the reflected light path of the beam splitter 2, and the incident angle B and the incident angle C determine the direction of the light beam after two reflections of the light beam passing through the beam splitter 2. By setting A+B+C=90°, the reflected light path of the beam splitter 2 can be set parallel to the reflected light path of the second reflector 4. Specifically, ignoring the light deviation caused by the beam splitter 2, the incident light path of the beam splitter 2 is parallel to the transmitted light path of the beam splitter 2. If the reflected light path of the second reflector 4 is required to be parallel to the reflected light path of the beam splitter 2, then in the triangle formed by the transmitted light path of the beam splitter 2, the reflected light path of the first reflector 3, and the reflected light path of the second reflector 4, twice the value of the incident angle A is equal to the angle between the transmitted light path of the beam splitter 2 and the reflected light path of the second reflector 4. The sum of the interior angles of a triangle formed by the transmitted light path of the beam splitter 2, the reflected light path of the first reflector 3, and the reflected light path of the second reflector 4 is 180°, the angle between the transmitted light path of the beam splitter 2 and the reflected light path of the first reflector 3 is twice the value of the incident angle B, and the angle between the reflected light path of the first reflector 3 and the reflected light path of the second reflector 4 is twice the value of the incident angle C. Therefore, the relationship among the incident angle A, the incident angle B, and the incident angle C is A+B+C=90°, which ensures that the reflected light path of the beam splitter 2 is parallel to the reflected light path of the second reflector 4, realizes a compact layout of the light path, and realizes precise alignment of light beams of different colors in space.

[0025] If the light deviation caused by the beam splitter 2 is calculated, the sum of the incident angles A, B and C can be corrected by a certain angle, so that the reflected light path of the beam splitter 2 is parallel to the reflected light path of the second reflector 4. In the embodiment, the correction of the certain angle is specifically within 5°.

[0026] The incident angle A is 45°.

[0027] The setting of the incident angle A to 45° is conducive to achieving efficient separation and direction adjustment of the light beam in a compact space, while facilitating subsequent optical path design and maintaining the compactness and optical efficiency of the system.

[0028] The beam splitter 2 is a color-dividing reflector capable of reflecting green light and red light and transmitting blue light, and the first reflector 3 and the second reflector 4 are blue-reflecting mirrors capable of reflecting blue light.

[0029] By setting up a color-separating reflector that can reflect green light and red light and can transmit blue light, and an anti-blue mirror that can reflect blue light, even if the initial overlap between the blue light beam of the laser lamp and the green light beam and the red light beam is poor, good spatial overlap can be achieved through the cooperation of the color-separating reflector and the anti-blue mirror, thereby forming a clear, dispersion-free color image or light spot on the screen.

[0030] The beam splitter 2 is coated with a beam splitter film that can transmit light beams in the frequency band of 440nm to 490nm and reflect light beams in the frequency band of 510nm to 540nm.

[0031] The output wavelength of blue light from commercial laser lamps is generally concentrated between 440nm and 490nm, with the most common wavelength being 445nm; and the output wavelength range of green light from commercial laser lamps is also often between 510nm and 540nm, especially when infrared lasers are used to perform frequency conversion through nonlinear optical materials to obtain green light, where the typical wavelength of the converted green light is generally concentrated around 520nm to 532nm.

[0032] In the embodiment, Figure 3 As shown in the reflectivity data graph, after the beam splitter is coated, the transmittance of 440nm~490nm blue light reaches more than 96%, and the reflectivity of 510nm~540nm green light reaches more than 97%. By setting the beam splitter film that can transmit the beam of 440nm~490nm frequency band and reflect the beam of 510nm~540nm frequency band, the beam splitter can minimize the beam loss of common commercial laser lights and ensure the brightness and efficiency of each color beam.

[0033] The first reflector 3 and the second reflector 4 are coated with a high reflective film capable of reflecting light beams in the frequency band of 440nm to 490nm.

[0034] In the embodiment, Figure 4 As shown in the reflectivity data graph, after the first reflector 3 and the second reflector 4 are coated, the reflectivity of the 440nm-490nm blue light reaches more than 97%. By coating the first reflector 3 and the second reflector 4 with a high reflective film that can reflect the light beam in the 440nm-490nm frequency band, the blue light frequency band is optimized, the color purity is improved, and the light energy loss is reduced.

[0035] In the embodiment, if the overlap of the three-color lasers needs to be adjusted, a second beam splitter that can transmit the primary color light beam whose overlap needs to be adjusted and reflect the other two primary color light beams can be provided on the reflected light path of the beam splitter 2, a third reflector that can reflect the transmitted light beam of the second beam splitter is provided on the transmitted light path of the second beam splitter, a fourth reflector that can reflect the light beam reflected by the third reflector is provided on the reflected light path of the third reflector, the reflected light path of the fourth reflector overlaps with the reflected light path of the second beam splitter, thereby completing the overlap adjustment of the three-color lasers.

[0036] The thickness of the beam splitter 2 is 0.6 mm to 0.8 mm.

[0037] The thickness of the beam splitter 2 directly affects the physical path length of the light when it passes through, and then affects the offset of the light. In the embodiment, the thickness of the beam splitter 2 is 0.7mm. Reducing the offset helps to ensure the precise overlap of blue light and other color light beams at the final focal point, avoiding color deviation and image blur. When the thickness of the beam splitter 2 is greater than 0.8mm, the light offset increases, and the optical path of the blue light passing through the beam splitter 2 will also increase, resulting in a greater offset of the light when it reaches the predetermined focus. This will directly affect the precise alignment of the red, green and blue lasers, causing image color distortion and reduced clarity; when the thickness of the beam splitter 2 is less than 0.6mm, the processing difficulty of the beam splitter 2 will increase, and it will be more likely to be damaged during manufacturing, transportation and installation, resulting in reduced yield and increased maintenance costs. At the same time, the thickness of the beam splitter 2 less than 0.6mm may affect the uniformity and integrity of the beam splitting film layer, resulting in a decrease in the beam splitting efficiency and unstable reflection and transmission performance.

Claims

1. A light source optical path system for laser projection, characterized in that: The invention comprises a laser light source module (1) capable of emitting red, green and blue light beams; a beam splitter (2) capable of transmitting a primary color light beam and reflecting other two primary color light beams is arranged in front of the laser light source module (1); a first reflector (3) capable of reflecting the transmitted light beam of the beam splitter (2) is arranged on the transmission light path of the beam splitter (2); a second reflector (4) capable of reflecting the light beam reflected by the first reflector (3) is arranged on the reflection light path of the first reflector (3); and the reflection light path of the second reflector (4) coincides with the reflection light path of the beam splitter (2).

2. The light source optical path system for laser projection according to claim 1, characterized in that: An incident angle A is provided between the beam splitter (2) and the incident light path, an incident angle B is provided between the first reflector (3) and the transmission light path of the beam splitter (2), and an incident angle C is provided between the second reflector (4) and the reflection light path of the first reflector (3). The relationship among the incident angle A, the incident angle B and the incident angle C is A+B+C=90°.

3. The light source optical path system for laser projection according to claim 2, characterized in that: The incident angle A is 45°.

4. The light source optical path system for laser projection according to claim 1, characterized in that: The beam splitter (2) is a color-dividing reflector capable of reflecting green light and red light and transmitting blue light, and the first reflector (3) and the second reflector (4) are blue-reflecting mirrors capable of reflecting blue light.

5. The light source optical path system for laser projection according to claim 4, characterized in that: The beam splitter (2) is coated with a beam splitter film which can transmit a light beam in a frequency band of 440nm to 490nm and can reflect a light beam in a frequency band of 510nm to 540nm.

6. The light source optical path system for laser projection according to claim 5, characterized in that: The first reflector (3) and the second reflector (4) are coated with a high-reflection film capable of reflecting light beams in the frequency band of 440nm to 490nm.

7. The light source optical path system for laser projection according to claim 4, characterized in that: The thickness of the beam splitter (2) is 0.6 mm to 0.8 mm.

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