CN110568707A - laser light source and laser projector - Google Patents

Abstract

The invention provides a laser light source and a laser projector, and relates to the technical field of filtering, wherein the laser light source comprises a laser, a wavelength conversion device and a filtering device which are sequentially arranged along the propagation direction of light; the filter device comprises a filter plate, a fixed part and a driving part, wherein the number of spectral bands corresponding to the filter plate is less than three, the fixed part is fixedly connected with the filter plate, and the fixed part is also connected with the driving part; the driving part is used for driving the fixing part to drive the filter plate to move according to a preset mode; the preset mode comprises reciprocating motion or rotation; the frequency of movement of the filter means matches the frequency of rotation of the wavelength conversion means. Compared with the prior art, the filtering device in the laser light source removes the antireflection film by optimizing the structure (including making the filter with less than three spectral bands do reciprocating motion or rotation), thereby improving the light energy utilization rate of equipment (such as a laser projector) applied to the laser light source and reducing the cost.

Description

Laser light source and laser projector

Technical Field

The invention relates to the technical field of laser light sources, in particular to a laser light source and a laser projector.

Background

With the development of projection technology, laser technology is increasingly applied to projection.

The laser light source in the laser projection technology outputs light including at least a red wavelength, a green wavelength, and a blue wavelength. When a laser light source of laser projection adopts blue excitation light (blue light), filtered red light and converted green light to directly perform emergent light color development, a filtering device in the existing laser light source generally at least comprises a red filter and a transparent antireflection film, wherein the antireflection film is obtained by plating an antireflection film on a transparent glass sheet, and both the green light and the blue light need to pass through the transparent antireflection film. Since the transmittance of the antireflection film is generally 97% -98%, the luminance of the laser projector is reduced by about 2% by the antireflection film, so that the light energy utilization rate of the laser projector is reduced.

Disclosure of Invention

The invention aims to provide a laser light source and a laser projector, so as to improve the light energy utilization rate of equipment applied by the laser light source and reduce the cost.

The invention provides a laser light source, which comprises a laser, a wavelength conversion device and a filtering device, wherein the laser, the wavelength conversion device and the filtering device are sequentially arranged along the propagation direction of light;

The filter device comprises a filter plate, a fixed part and a driving part, wherein the number of spectral bands corresponding to the filter plate is less than three; the fixed part is fixedly connected with the filter plate, and the fixed part is also connected with the driving part; the driving part is used for driving the fixed part to drive the filter plate to move according to a preset mode; the preset mode comprises reciprocating motion or rotation;

The movement frequency of the filter device is matched with the rotation frequency of the wavelength conversion device, so that when the wavelength conversion device performs wavelength conversion on exciting light emitted by the laser to obtain target light corresponding to the filter, the filter moves to a preset color filtering position of the laser light source.

further, the reciprocating motion includes a linear reciprocating motion or a swing motion.

further, if the preset mode is rotation, the shape of the fixing part comprises symmetrical patterns, a dam-shaped counterweight part is arranged on the fixing part, and a balancing weight is arranged in the counterweight part.

Further, the fixing member has a circular shape, and the weight portion has an annular shape.

Further, the filter includes red filter or green filter, the barycenter of fixed part is kept away from the one end at filter place.

Furthermore, the filter comprises a red filter and a green filter, the red filter and the green filter are arranged diagonally, and the center of mass of the fixed part is arranged on the center of circle of the fixed part or close to the side of the red filter and the green filter with smaller mass; the filtering device is used for outputting discontinuous time sequence light, and the time sequence light comprises red light and green light.

Further, an effective size of the filter segment is equal to or larger than a spot size of the target light corresponding to the filter segment at the predetermined color filtering position.

Furthermore, the light-emitting side of the filtering device is provided with a light guide pipe, and the effective size of the filter is larger than or equal to the light-in aperture of the light guide pipe.

Furthermore, the filter comprises a red filter, the wavelength conversion device comprises a wavelength conversion region corresponding to red light and other regions for outputting blue light and green light, and a yellow light or red light wavelength conversion material is arranged on the wavelength conversion region corresponding to the red light;

The movement frequency of the filter device is matched with the light emitting color sequence and the rotation frequency of the wavelength conversion device, so that when the laser light source emits red light, the exciting light irradiates the wavelength conversion region corresponding to the red light, the red filter plate moves to the preset filter position and filters yellow excited light or red excited light generated by the wavelength conversion region corresponding to the red light to obtain red light, and the red light and the blue light and the green light output by other regions are combined into white light.

Further, the filter plate comprises a green filter plate, the laser comprises a blue laser and a red laser, and the wavelength conversion device comprises a blank area and a wavelength conversion area corresponding to green light;

The movement frequency of the filter device is matched with the light emitting color sequence and the rotation frequency of the wavelength conversion device, so that when the laser light source emits green light, blue excitation light emitted by the blue laser irradiates to the wavelength conversion region corresponding to the green light, the green filter moves to the preset color filtering position and filters green excited light generated by the wavelength conversion region corresponding to the green light to obtain the green light, and the green light, the blue excitation light output by the blank region and the red light output by the red laser are synthesized into white light.

Further, the driving part includes a linear motor.

The invention also provides a laser projector which comprises the laser light source.

In the laser light source and the laser projector provided by the invention, the laser light source comprises a laser, a wavelength conversion device and a filter device which are sequentially arranged along the propagation direction of light; the filter device comprises a filter plate, a fixed part and a driving part, wherein the number of spectral bands corresponding to the filter plate is less than three, the fixed part is fixedly connected with the filter plate, and the fixed part is also connected with the driving part; the driving part is used for driving the fixing part to drive the filter plate to move according to a preset mode; the preset mode comprises reciprocating motion or rotation; the movement frequency of the filter device is matched with the rotation frequency of the wavelength conversion device, so that when the wavelength conversion device performs wavelength conversion on exciting light emitted by the laser to obtain target light corresponding to the filter, the filter moves to a preset color filtering position of the laser light source. Compared with the prior art, the filtering device in the laser light source removes the antireflection film by optimizing the structure (including making the filter with less than three spectral bands do reciprocating motion or rotation), thereby improving the light energy utilization rate of equipment (such as a laser projector) applied to the laser light source and reducing the cost.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a filtering apparatus according to an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a laser light source according to an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of another filtering apparatus according to an embodiment of the present invention;

Fig. 4 is a schematic structural diagram of another laser light source according to an embodiment of the present invention;

Fig. 5 is a schematic structural diagram of another filtering apparatus according to an embodiment of the present invention.

Icon: 101. 301-a filter; 102. 302, 503-fixation means; 103. 303, 504-drive means; 201. 401-laser module; 202. 402-a first lens; 203. 403-a second lens; 204. 404-dodging elements; 205. 405-a dichroic mirror; 206. 406-a third lens; 207. 407-a wavelength conversion device; 208. 408-a fourth lens; 209. 409-filtering means; 210. 410-a light pipe; 304. 505-a weight; 501-red filter plate; 502-green filter segment.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

One common technique in the laser projection technology is to excite a wavelength conversion material on a wavelength conversion device with excitation light to obtain light with different wavelengths, and the wavelength conversion material with different wavelengths can be manufactured on the wavelength conversion device in a time sequence or not, so as to be excited to emit light with different wavelengths. Because the existing blue light and red light wavelength conversion materials have low conversion efficiency and poor thermal stability, the red light part can be obtained by exciting the yellow light wavelength conversion material by using exciting light and then filtering the yellow light by matching with a red filter plate to obtain red light; the blue light part can utilize blue exciting light in the exciting light to pass through a blank area on the wavelength conversion device and then be matched with a transparent film on the filtering device to directly carry out light emitting color development. The green light and the yellow light have higher wavelength conversion efficiency, so that the excitation light can be directly utilized to excite the wavelength conversion material to form green and yellow excited light for direct light development.

Based on the above, the filtering device in the existing laser light source is usually at least provided with a red filter and an anti-reflection film, the anti-reflection film is used for passing yellow light, green light, blue light and the like, and the anti-reflection film reduces the light energy utilization rate of the equipment applied by the laser light source. Therefore, according to the laser light source and the laser projector provided by the embodiment of the invention, the anti-reflection film is removed through the optimized structure, so that the light energy utilization rate of the laser projector can be improved, and the cost is reduced.

For the understanding of the present embodiment, a detailed description will be given to a laser light source disclosed in the present embodiment.

Embodiments of the present invention provide a laser light source that may be, but is not limited to, applied to a laser projector or a lighting apparatus. The laser light source comprises a laser, a wavelength conversion device and a filtering device which are sequentially arranged along the propagation direction of light; the filter device comprises a filter plate, a fixed part and a driving part, wherein the number of spectral bands corresponding to the filter plate is less than three; the fixed part is fixedly connected with the filter plate and is also connected with the driving part; the driving part is used for driving the fixing part to drive the filter plate to move according to a preset mode; the preset manner includes reciprocating motion or rotation. The movement frequency of the filter device is matched with the rotation frequency of the wavelength conversion device, so that when the wavelength conversion device performs wavelength conversion on exciting light emitted by the laser to obtain target light corresponding to the filter, the filter moves to a preset color filtering position of the laser light source.

The spectral band corresponding to the filter can be one or two. Specifically, the color (spectral band) of the filter is correlated with the wavelength of the excited light output from the wavelength conversion device. For example, if the wavelength conversion device performs wavelength conversion on the excitation light to obtain excited light with a red wavelength, and the excited light needs to be filtered by red light, the filter may be a red filter; if the wavelength conversion device performs wavelength conversion on the exciting light to obtain excited light containing green light wavelength, and the excited light needs to be subjected to green light filtering, the filter can be a green filter; if the wavelength conversion device outputs the excited light (corresponding to different wavelength conversion materials) containing red light wavelength and green light wavelength respectively at different moments, and the excited light needs to filter red light and green light respectively, the filter can adopt a red filter and a green filter.

When color filtering is needed, the driving part drives the corresponding filter plate to move to a preset color filtering position; when the color filtering is not needed, the driving part drives the filter plate to be away from the preset color filtering position, namely, other wavelength light which does not need to be filtered in the laser light source does not pass through the filter device, and therefore the loss of the other wavelength light can be reduced.

Optionally, when the preset mode is a reciprocating motion, the filter may have one corresponding spectral band. When the preset mode is rotation, the spectral band corresponding to the filter can be one or two.

Alternatively, the laser may be a single laser, or a laser module including a plurality of lasers may be used.

Compared with the prior art, the filtering device in the laser light source removes the antireflection film by optimizing the structure (including making the filter with less than three spectral bands do reciprocating motion or rotation), thereby improving the light energy utilization rate of equipment (such as a laser projector) applied to the laser light source and reducing the cost.

For convenience of understanding, taking an example that a laser light source is applied to a laser projector, the embodiment of the present invention provides three alternative structures of a filter device in the laser light source, and the three filter devices and corresponding laser light sources will be described in detail below with reference to fig. 1 to 5.

The embodiment of the invention provides a filter device of a laser light source, wherein the laser light source at least comprises a blue light wavelength, a green light wavelength and a red light wavelength. Referring to fig. 1, a schematic structural diagram of a filtering apparatus includes a filter 101, a fixing part 102 and a driving part 103, where the filter 101 includes a red filter or a green filter; fixed part 102 is fixedly connected to filter 101, and fixed part 102 is also connected to drive part 103. The driving part 103 is used for driving the fixing part 102 to drive the filter 101 to reciprocate on a preset path, and when the wavelength conversion device in the laser light source outputs target light corresponding to the filter 101, the filter 101 moves to a preset color filtering position of the laser light source.

If the wavelength conversion device in the laser light source outputs the excited light having a red wavelength, the filter 101 is a red filter. Optionally, the wavelength conversion device includes a wavelength conversion region corresponding to red light and other regions outputting blue light and green light, and a wavelength conversion material of yellow light or red light is disposed on the wavelength conversion region corresponding to red light; the movement frequency of the filter device is matched with the light emitting color sequence and the rotation frequency of the wavelength conversion device, so that when the laser light source emits red light, the exciting light irradiates the wavelength conversion region corresponding to the red light, the red filter plate moves to a preset filter position and filters yellow excited light or red excited light generated by the wavelength conversion region corresponding to the red light to obtain red light, the subsequent red light and blue light and green light output by other regions are combined into white light, and the white light emitting is realized.

Considering that the wavelength conversion material of red light has low conversion efficiency and poor thermal stability, the red light part can adopt the wavelength conversion material of exciting light to excite yellow light to obtain yellow light, and then the yellow light is matched with the red filter to filter red light. Based on this, in an optional implementation manner, the laser in the laser light source includes a blue laser, the wavelength conversion device includes a blank region and a wavelength conversion region corresponding to green light and yellow light, and green phosphor and yellow phosphor are respectively disposed in the wavelength conversion regions corresponding to green light and yellow light; the blue excitation light emitted by the blue laser respectively excites the green fluorescent powder and the yellow fluorescent powder in the wavelength conversion regions corresponding to the green light and the yellow light to generate green light and yellow light, and the red light is obtained by selectively filtering the yellow light through a red filter in the filter device, so that the light emitting and color development of the red light are realized. Then, the red light can be combined with the green light and the blue excitation light transmitted through the blank area to form white light, so that white light is emitted.

As above, if the wavelength conversion device in the laser light source outputs the excited light having the wavelength of green light, the filter 101 is a green filter. In an optional implementation manner, the laser in the laser light source may include a blue laser and a red laser, and the wavelength conversion device includes a blank region and a wavelength conversion region corresponding to green light, where red light emitted by the red laser does not pass through the wavelength conversion device, and the red light is directly output to implement light emission color rendering of the red light; the movement frequency of the filter device is matched with the light emitting color sequence and the rotation frequency of the wavelength conversion device, so that when the laser light source emits green light, blue exciting light emitted by the blue laser irradiates to a wavelength conversion region corresponding to the green light, the green filter plate moves to a preset filter position and filters green excited light generated by the wavelength conversion region corresponding to the green light to obtain the green light, the subsequent green light and the blue exciting light output by the blank region and red light output by the red laser are combined into white light, and white light emitting is realized. The green excited light is filtered through the green filter plate in the filter device, so that the color purity of green light can be improved, and the color development effect of the laser projector is improved.

Alternatively, the reciprocating motion may include a linear reciprocating motion or a swinging motion. Taking filter 101 as a red filter as an example, the working principle of the filter device is as follows: the driving part 103 may provide a linear motion or a swing motion to the red filter segment; when red light emitting color development is needed, the driving part 103 drives the fixing part 102 to drive the red filter plate to move to a preset color filtering position; when red light emission color development is not required, the driving member 103 drives the fixing member 102 to move the red filter plate away from a predetermined color filtering position.

The filtering apparatus provided in this embodiment is different from the filtering apparatus in the prior art, and specifically includes the following: the prior art filter device usually adopts a rotary driving method, and the filter device makes each filter plate into a circle, and the circle is driven by a driving part to rotate, so that the filter plates with different wavelengths are scanned by the light to be filtered at different times. The filter device in this embodiment includes only the filter 101 of a single wavelength, and when the target light needs to be filtered, the driving part 103 drives the filter 101 at a predetermined filtering position of the optical path so that the filter 101 is scanned by the target light; when no color filtering is needed, the driving part 103 drives the filter 101 out of the optical path so that the light enters the rear end opto-mechanical system directly. That is, only when the target light to be filtered passes through the filter device, the target light will scan the red filter or the green filter on the filter device, and the light of the laser light source does not intersect with the filter device in other time, so that the loss of light with other wavelengths can be reduced.

Alternatively, the driving part 103 may include a linear motor. The linear motor is also called linear motor, linear motor and push rod motor, and is one kind of transmission device capable of converting electric energy directly into linear motion mechanical energy without needing any intermediate conversion mechanism. A linear motor is easier to implement in the filter device.

Alternatively, the material of the fixing member 102 may be metal, such as aluminum, copper, or stainless steel. The fixing part 102 may fix the filter 101 by, but is not limited to, glue.

alternatively, the effective size of the above-described filter 101 is equal to or larger than the spot size of the target light corresponding to the filter at a predetermined color filtering position. This ensures that the target light passes through the filter 101 entirely. The effective size of filter 101 here refers to the size exposed to the light path.

In the embodiment of the invention, a filtering device in a laser light source comprises a filter, a fixed part and a driving part, wherein the filter comprises a red filter or a green filter; the fixed part is fixedly connected with the filter plate and is also connected with the driving part; the driving part is used for driving the fixing part to drive the filter plate to do reciprocating motion on a preset path. Compared with the prior art, the filtering device has the advantages that an anti-reflection diaphragm is removed, the structure is simple, the light energy utilization rate of the laser projector is improved, and the cost is reduced.

For the sake of understanding, the following description will exemplarily describe a laser light source based on the filter device shown in fig. 1 with reference to fig. 2, taking the filter as a red filter as an example.

Fig. 2 is a schematic structural diagram of a laser light source according to an embodiment of the present invention, in which a laser module composed of a blue laser is used as a laser in the laser light source. As shown in fig. 2, the laser light source includes a laser module 201, a first lens 202, a second lens 203, a light homogenizing element 204, a dichroic mirror 205, a third lens 206, a wavelength conversion device 207, a fourth lens 208, a filtering device 209, and a light guide 210. The wavelength conversion device 207 includes a blank region and a wavelength conversion region corresponding to green light and yellow light, which may form a circle or a ring and rotate under the driving of the driving device. The green light wavelength conversion region is internally provided with a green light wavelength conversion material, and the yellow light wavelength conversion region is internally provided with a yellow light wavelength conversion material.

As shown in fig. 2, the principle of the emission color development of the three colors of light of the laser light source is as follows: the laser module 201 emits blue excitation light, the blue excitation light is collimated by the first lens 202 and the second lens 203, then is uniformly distributed by the uniform light element 204 and reflected by the dichroic mirror 205, and finally is focused to a wavelength conversion point of the wavelength conversion device 207 by the third lens 206; the blue excitation light is converted by the wavelength conversion device 207 to generate green light and yellow light, the green light and the yellow light are reflected by the wavelength conversion device 207 and then sequentially pass through the third lens 206, the dichroic mirror 205 and the fourth lens 208, wherein the green light is focused by the fourth lens 208 and then directly enters the light guide pipe 210, and the light emitting and color development of the green light are realized; the yellow light reaches the filter 209 after being focused by the fourth lens 208, and enters the light guide 210 after being filtered by the red filter to obtain red light, so that the light emitting and color development of the red light are realized. In addition, a part of the blue excitation light passes through the blank region of the wavelength conversion device 207, and is directly focused to the light guide 210 by the fourth lens 208 after a series of reflections, so as to realize the light emission color development of the blue light (the light emission color development path of the blue light is not shown in the figure).

The frequency of the red filter plate driven by the driving part of the filter device 209 to reciprocate needs to match the rotation frequency of the wavelength conversion device 207, for example: when the blue excitation light starts to scan to the wavelength conversion material emitting red light, the driving member drives the red filter to reach a predetermined color filtering position, which is generally located at the light inlet of the light guide 210; when the spot of the blue excitation light leaves the wavelength converting material for red light, the driving section also drives the red filter plate away from the predetermined filter position.

Alternatively, in fig. 2, the effective size of the red filter is equal to or larger than the spot size of the target light that is focused by the fourth lens 208 and then scanned on the red filter, that is, the effective size of the red filter is equal to or larger than the spot size of the yellow light at the predetermined filter position. Further, as shown in fig. 2, when the light exit side of the filter 209 is provided with the light pipe 210, the effective size of the filter (red filter) is greater than or equal to the light entrance aperture of the light pipe 210.

The embodiment of the invention also provides a filter device of the laser light source, and the laser light source at least comprises blue light wavelength, green light wavelength and red light wavelength. Referring to fig. 3, another filter apparatus is shown, which includes a filter 301, a fixing part 302 and a driving part 303, where the filter 301 includes a red filter or a green filter; the fixing member 302 is fixedly connected with the filter 301, the fixing member 302 is further connected with the driving member 303, the driving member 303 is used for driving the fixing member 302 to drive the filter 301 to rotate, and when the wavelength conversion device in the laser light source outputs the target light corresponding to the filter 301, the filter 301 rotates to a predetermined color filtering position of the laser light source. The shape of the fixing member 302 includes a symmetrical pattern, a dam-shaped weight portion 304 is provided on the fixing member 302, and a weight block is provided in the weight portion 304.

Specifically, the box dam refers to a shape that completely encloses a designated area. The weight 304 and the internal weight are used to keep the filter device balanced when rotating to prevent noise and vibration problems due to rotational imbalance. The dam-shaped weight part 304 can enhance the balance of the filter device and prevent the weight block from being separated from the weight part during high-speed rotation.

Taking the filter 301 as a red filter for filtering yellow light generated by the wavelength conversion device, the working principle of the filter is as follows: when red light emergent color development is needed, exciting light emitted by the laser scans to a yellow wavelength conversion material in the wavelength conversion device to generate yellow light, and the yellow light is filtered by the red filter to obtain red light. The red filter of the filter device corresponds to the wavelength conversion material (yellow wavelength conversion material) which emits red light on the wavelength conversion device in the laser light source, and the angle is consistent with the light emission color sequence, so as to achieve synchronization. When the light of the laser light source passes through the filter device, only yellow light can scan the red filter plate on the filter device, and the light of the laser light source does not intersect with the filter device in other time, so that the loss of light with other wavelengths can be reduced.

Alternatively, the fixing member 302 may have a circular shape and the weight portion 304 may have an annular shape. This is easier to realize technically.

Alternatively, the material of the fixing member 302 may be metal, such as aluminum, copper, or stainless steel. The fixing part 302 may fix the filter 301 by, but not limited to, glue.

alternatively, the center of mass of the fixed member 302 is located away from the end where the filter 301 is located. Thus, the fixing member 302 can also function as a counterweight, and the counterweight 304 only needs to be finely adjusted.

In the embodiment of the invention, a filtering device in a laser light source comprises a filter, a fixed part and a driving part, wherein the filter comprises a red filter or a green filter; the fixed part is fixedly connected with the filter, and is also connected with the driving part which is used for driving the fixed part to drive the filter to rotate; the fixing part is circular, and an annular counterweight part is arranged on the fixing part. Compared with the prior art, the filtering device removes an anti-reflection diaphragm, and simultaneously ensures the rotation balance problem of the filtering device during working through the annular counterweight part, so the filtering device has a simple structure, improves the light energy utilization rate of the laser projector, and reduces the cost.

For the sake of easy understanding, the following description will exemplarily describe a laser light source based on the filter device shown in fig. 3 with reference to fig. 4, taking the filter as a red filter as an example.

Fig. 4 is a schematic structural diagram of another laser light source according to an embodiment of the present invention, in which a laser module including a blue laser is used as a laser in the laser light source. As shown in fig. 4, the laser light source includes a laser module 401, a first lens 402, a second lens 403, a light homogenizing element 404, a dichroic mirror 405, a third lens 406, a wavelength conversion device 407, a fourth lens 408, a filtering device 409, and a light pipe 410. The wavelength conversion device 407 includes a blank region and a wavelength conversion region corresponding to green light and yellow light, which may form a circle or a ring and rotate under the driving of the driving device. The green light wavelength conversion region is internally provided with a green light wavelength conversion material, and the yellow light wavelength conversion region is internally provided with a yellow light wavelength conversion material.

As shown in fig. 4, the principle of the emission color development of the three colors of light of the laser light source is as follows: the laser module 401 emits blue excitation light, the blue excitation light is collimated by the first lens 402 and the second lens 403, then is uniformly distributed by the light-distributing element 404 and reflected by the dichroic mirror 405, and finally is focused to a wavelength conversion point of the wavelength conversion device 407 by the third lens 406; the blue excitation light is converted by the wavelength conversion device 407 to generate green light and yellow light, the green light and the yellow light are reflected by the wavelength conversion device 407 and then sequentially pass through the third lens 406, the dichroic mirror 405 and the fourth lens 408, wherein the green light is focused by the fourth lens 408 and then directly enters the light guide 410, and the light emitting and color development of the green light are realized; the yellow light is focused by the fourth lens 408 and then reaches the filter device 409, and after being filtered by the red filter to obtain red light, the red light enters the light guide 410, so that the light emitting and color development of the red light are realized. In addition, a part of the blue excitation light passes through the blank region of the wavelength conversion device 407, and is directly focused to the light guide 410 by the fourth lens 408 after a series of reflections, so as to realize the light emission color development of blue light (the light emission color development path of blue light is not shown in the figure).

The frequency of the driving component of the filter device 409 driving the red filter to rotate needs to match the rotation frequency of the wavelength conversion device 407, for example: when the blue excitation light starts to scan to the wavelength conversion material for emitting red light (wavelength conversion material for yellow light), the driving member drives the red filter to a predetermined color filtering position, which is generally located at the light entrance of the light guide 410; when the spot of the blue excitation light leaves the wavelength converting material for red light, the driving section also drives the red filter plate away from the predetermined filter position.

Alternatively, the effective size L of the red filter in FIG. 4 is equal to or larger than the spot size of the target light that is scanned on the red filter after being condensed by the fourth lens 408, i.e., L ≧ the spot size of the yellow light at the predetermined filter position. Further, as shown in fig. 4, when the light guide 410 is disposed on the light exit side of the filter device 409, the effective size L of the filter (red filter) is greater than or equal to the light entrance aperture of the light guide 410.

The embodiment of the invention also provides a filter device of the laser light source, and the laser light source at least comprises blue light wavelength, green light wavelength and red light wavelength. Referring to a schematic structural diagram of another filtering apparatus shown in fig. 5, compared with the filtering apparatus shown in fig. 3, a filter is added, and specifically, the filtering apparatus includes a red filter 501, a green filter 502, a fixing part 503 and a driving part 504; the fixing component 503 is respectively fixedly connected with the red filter 501 and the green filter 502, the fixing component 503 is further connected with the driving component 504, the driving component 504 is used for driving the fixing component 503 to drive the red filter 501 and the green filter 502 to rotate, and when the wavelength conversion device in the laser light source outputs target light corresponding to the red filter 501, the red filter 501 rotates to a preset color filtering position of the laser light source; when the wavelength conversion device in the laser light source outputs the target light corresponding to the green filter 502, the green filter 502 is rotated to a predetermined filter position of the laser light source. The shape of the fixing member 503 includes a symmetrical pattern, a dam-shaped weight portion 505 is provided on the fixing member 503, and a weight is provided in the weight portion 505.

Likewise, the dam-shaped weight 505 may enhance the balance of the filter device, preventing the weight from being separated from the weight when rotating at high speed.

In an alternative implementation, the laser in the laser light source may include a blue laser, and the wavelength conversion device includes a blank region and wavelength conversion regions corresponding to green light and yellow light; blue excitation light emitted by the blue laser excites the wavelength conversion device to generate green light and yellow light, and the yellow light is selectively filtered by the red filter 501 to obtain red light, so that the emergent light color development of the red light is realized; the green filter 502 filters the green light to improve the color purity of the green light, so that the color rendering effect of the laser projector is improved, and the requirements of high-color-requirement occasions such as televisions, movies and the like are met.

The working principle of the filtering device is the same as that of the filtering device shown in fig. 3, and the description thereof is omitted. Similarly, the red filter 501 and the green filter 502 of the filter device correspond to the wavelength conversion materials for emitting red light and green light on the wavelength conversion device in the laser light source, and the angles are consistent with the color sequence of the emitted light, so as to achieve synchronization. When the light of the exciting light converted by the wavelength conversion device passes through the filter device, the light can only scan the red filter 501 and the green filter 502 on the filter device, and the light does not intersect with the filter device in other time, so that the loss of light with other wavelengths can be reduced.

Alternatively, the fixing member 503 may have a circular shape, and the weight 505 may have an annular shape. This is easier to realize technically.

Alternatively, the material of the fixing member 503 may be metal, such as aluminum, copper, or stainless steel. The fixing part 503 may fix the red filter 501 and the green filter 502 by, but not limited to, glue.

Optionally, the red filter 501 and the green filter 502 are arranged diagonally (or in central symmetry), and the center of mass of the fixing component 503 is arranged at the center of the fixing component 503 or close to the side of the red filter 501 and the green filter 502 with smaller mass; the filtering device is used for outputting discontinuous time sequence light, and the time sequence light comprises red light and green light. Thus, the counterweight 304 only needs to be finely adjusted, and the rotating unbalance of the filter device during operation can be reduced.

Specifically, the red filter 501 and the green filter 502 may be disposed at a positive angle or a non-positive angle, and the angle deviation is smaller than a preset angle threshold, which may be set according to an actual situation, and is not limited herein. When the red filter plate 501 and the green filter plate 502 are diagonally arranged, red light and green light are alternately arranged in the light-emitting color sequence of the wavelength conversion device. For example, the emission color sequence of the wavelength conversion device may be red, blue, green, and yellow, or may be red, yellow, green, and blue.

Alternatively, the effective size L of the red filter 501 and the effective size of the green filter 502 are each equal to or larger than the spot size of the corresponding target light at a predetermined filter position. When the light exit side of the filter device is provided with a light guide, the predetermined color filter position may be located at the light entrance of the light guide. Further, the effective size L of the red filter 501 and the effective size L of the green filter 502 are both greater than or equal to the light entrance aperture of the light guide.

The application of the filter device shown in fig. 5 in the laser light source is the same as the application of the filter device shown in fig. 3 in the laser light source, and reference may be made to the relevant contents of the foregoing embodiments, which are not repeated herein.

in addition, the embodiment of the invention also provides a laser projector which comprises the laser light source.

The laser projector provided in this embodiment has the same implementation principle and technical effects as those of the laser source embodiment, and for brief description, reference may be made to the corresponding contents in the laser source embodiment for a part not mentioned in the laser projector embodiment.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (12)

1. A laser light source is characterized by comprising a laser, a wavelength conversion device and a filter device which are arranged in sequence along the propagation direction of light;

The filter device comprises a filter plate, a fixed part and a driving part, wherein the number of spectral bands corresponding to the filter plate is less than three; the fixed part is fixedly connected with the filter plate, and the fixed part is also connected with the driving part; the driving part is used for driving the fixed part to drive the filter plate to move according to a preset mode; the preset mode comprises reciprocating motion or rotation;

the movement frequency of the filter device is matched with the rotation frequency of the wavelength conversion device, so that when the wavelength conversion device performs wavelength conversion on exciting light emitted by the laser to obtain target light corresponding to the filter, the filter moves to a preset color filtering position of the laser light source.

2. the laser light source of claim 1, wherein the reciprocating motion comprises a linear reciprocating motion or a swinging motion.

3. The laser light source of claim 1, wherein if the predetermined manner is rotation, the shape of the fixing member comprises a symmetrical pattern, and a dam-shaped weight portion is disposed on the fixing member and a weight block is disposed in the weight portion.

4. the laser light source according to claim 3, wherein the fixing member has a circular shape, and the weight portion has an annular shape.

5. the laser light source of claim 3, wherein the filter comprises a red filter or a green filter, and the center of mass of the fixing part is far away from the end where the filter is located.

6. The laser light source of claim 4, wherein the filter comprises a red filter and a green filter, the red filter and the green filter are arranged diagonally, and the center of mass of the fixed component is arranged at the center of the circle of the fixed component or close to the side of the fixed component with smaller mass in the red filter and the green filter; the filtering device is used for outputting discontinuous time sequence light, and the time sequence light comprises red light and green light.

7. The laser light source of claim 1, wherein an effective size of the filter is equal to or larger than a spot size of target light corresponding to the filter at the predetermined color filtering position.

8. the laser light source of claim 7, wherein the light exit side of the filter is provided with a light pipe, and the effective size of the filter is greater than or equal to the light entrance aperture of the light pipe.

9. The laser light source according to any one of claims 1 to 5, wherein the filter comprises a red filter, the wavelength conversion device comprises a wavelength conversion region corresponding to red light and other regions outputting blue light and green light, and a wavelength conversion material of yellow light or red light is disposed on the wavelength conversion region corresponding to red light;

The movement frequency of the filter device is matched with the light emitting color sequence and the rotation frequency of the wavelength conversion device, so that when the laser light source emits red light, the exciting light irradiates the wavelength conversion region corresponding to the red light, the red filter plate moves to the preset filter position and filters yellow excited light or red excited light generated by the wavelength conversion region corresponding to the red light to obtain red light, and the red light and the blue light and the green light output by other regions are combined into white light.

10. The laser light source of any one of claims 1 to 5, wherein the filter comprises a green filter, the lasers comprise a blue laser and a red laser, and the wavelength conversion device comprises a blank region and a wavelength conversion region corresponding to green light;

the movement frequency of the filter device is matched with the light emitting color sequence and the rotation frequency of the wavelength conversion device, so that when the laser light source emits green light, blue excitation light emitted by the blue laser irradiates to the wavelength conversion region corresponding to the green light, the green filter moves to the preset color filtering position and filters green excited light generated by the wavelength conversion region corresponding to the green light to obtain the green light, and the green light, the blue excitation light output by the blank region and the red light output by the red laser are synthesized into white light.

11. The laser light source of any one of claims 1-8, wherein the drive component comprises a linear motor.

12. A laser projector comprising the laser light source according to any one of claims 1 to 11.