Light source

Abstract

The utility model provides a light source which is composed of a main light-emitting device, a wavelength conversion device, a reflection device and a dichroic filter, the reflection device and the wavelength conversion device are arranged on the two sides of the dichroic filter respectively, and the light-emitting device and the wavelength conversion device are arranged on the two sides or the same side of the dichroic filter. The three-piece projector has the advantages that through the combination of the dichroic optical filter, the wavelength conversion device and the reflection device, after light emitted by a single main light-emitting device is separated, part of the light is reflected by the reflection device, part of the light is subjected to wavelength conversion and then is combined and output, and the problems that in the prior art, a three-piece projector is large in number of light-emitting devices, the structural space in the projector is limited, and cost is high are solved. The structure is complex, and the production cost is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to laser projector field especially relates to a light source. BACKGROUND

[0002] For the laser fluorescence type light source applied to the three-piece projector, a separate excitation light source is needed to excite the wavelength conversion device to generate light of another wavelength range, and the newly generated light is the excited light. The excitation light source is usually a blue light source, and the excited light is usually a mixed wavelength light containing both green and red.

[0003] Since the projector projects white light, a separate blue light source is needed to generate another set of blue light to combine with the excited light to form the required white light, and then provide it to the projector for use. This separate blue light source usually needs to be placed in a different direction from the excitation light in order to be finally combined with the excited light.

[0004] According to the requirements of the working conditions of the laser itself, whether it is an excitation light source or a separate blue light source used to combine with the excited light, a separate heat dissipation module and a corresponding control mechanism are needed, which will occupy the space inside the projector, and will also occupy the resources of the projector system when controlling the laser, and increase the complexity of the system.

[0005] Therefore, how to reduce the number of light sources in the projector while ensuring the emission of white light and reduce the overall volume of the laser light source has become a problem to be solved. UTILITY MODEL CONTENTS

[0006] The utility model provides a light source to solve the problems of many light sources in the three-piece projector, tight structure space in the projector, large volume of light source and high production cost in the prior art.

[0007] In order to achieve the above purpose, the utility model technical scheme provides a light source, characterized in that it comprises: a main light emitting device, a dichroic filter, a wavelength conversion device and a reflecting device. The reflecting device and the wavelength conversion device are located on the two sides of the dichroic filter, and the main light emitting device and the wavelength conversion device are located on the two sides or the same side of the dichroic filter. The reflected light of the reflecting device can be combined with the light generated by the wavelength conversion device and output through the dichroic filter.

[0008] As a preferred embodiment of the above technical scheme, preferably, the dichroic filter is covered with a film layer having partial transmission and partial reflection function for the light emitted by the main light emitting device.

[0009] As a preferred embodiment of the above technical scheme, preferably, an auxiliary light emitting device is added, which is placed on the same side of the dichroic filter as the reflecting device.

[0010] As a preferred embodiment of the above technical solution, preferably, the light emitted by the auxiliary light-emitting device and the light emitted by the main light-emitting device are partially reflected by the reflective device and then combined together and guided to the dichroic filter. The light emitted by the auxiliary light-emitting device and the light emitted by the main light-emitting device are then filtered by the dichroic filter and combined for output.

[0011] As a preferred embodiment of the above technical solution, the reflecting device is another dichroic filter that reflects the light generated by the main light-emitting device while transmitting the light emitted by the auxiliary light-emitting device.

[0012] This utility model provides a light source comprising a main light-emitting device, a wavelength conversion device, a reflective device, and a dichroic filter. The reflective device and the wavelength conversion device are located on opposite sides of the dichroic filter, while the main light-emitting device and the wavelength conversion device are located on opposite sides or on the same side of the dichroic filter.

[0013] The advantage of this invention is that by combining a dichroic filter, a wavelength conversion device, and a reflection device, the light emitted by a single main light-emitting device is separated, part of which is reflected by the reflection device, and part of which is wavelength converted and then combined for output. This reduces the number of light sources in the projector and solves the problems of large number of light sources, tight structural space, large light source size, and high production cost in existing three-panel projectors. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of an embodiment of a light source provided by the present invention.

[0016] Figure 2 In order to be in Figure 1 The diagram shown is a structural schematic of an embodiment of a light source provided by this utility model, with an auxiliary light-emitting device added.

[0017] Figure 3 This is a schematic diagram of another embodiment of a light source provided by this utility model.

[0018] Figure 4 In order to be in Figure 3 The diagram shown is a structural schematic of another embodiment of the light source provided by this utility model, with an auxiliary light-emitting device added. Detailed Implementation

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0020] First, the technical scheme of the present application is briefly described, Figures 1 to 4 The structure schematic diagram provided by the embodiments of the present application is specific,

[0021] The light source comprises: a main light emitting device 101, a plurality of dichroic filters, a wavelength conversion device 103, a reflecting device, and can further comprise an auxiliary light emitting device 105.

[0022] Reference Figure 1 and Figure 3 The reflecting device and the wavelength conversion device 105 are separately located on the two sides of the dichroic filter, and the main light emitting device 101 and the wavelength conversion device 103 are located on the two sides or the same side of the dichroic filter.

[0023] As shown in Figure 1 and Figure 2 When the main light emitting device 101 and the reflecting device are on the same side of the dichroic filter, the emitted light of the main light emitting device 101 and the reflected light of the reflecting device converge and then transmit through the dichroic filter, and then combine with the excitation light converted by the wavelength conversion device 103 and emit. As shown in Figure 3 and Figure 4 When the main light emitting device 101 and the reflecting device are on the same side of the dichroic filter, the emitted light of the main light emitting device 101 and the reflected light of the reflecting device converge and then transmit through the dichroic filter, and then combine with the excitation light converted by the wavelength conversion device 103 and emit. As shown in

[0024] The dichroic filter is covered with a film layer having a partial transmission and partial reflection function for the light emitted by the main light emitting device. The type of the film layer includes but is not limited to: dielectric film, metal film, etc.

[0025] The auxiliary light emitting device 105 can also be included, and the auxiliary light emitting device 105 and the reflecting device are on the same side of the dichroic filter, and are used to supplement the brightness of a certain color light after combining light and adjust the color coordinates of a certain color light. The light emitted by the auxiliary light emitting device 105 and the part of the light emitted by the main light emitting device reflected by the reflecting device are combined together and guided to the dichroic filter, and the excitation light generated by the wavelength conversion device is filtered by the dichroic filter to combine and output.

[0026] The technical scheme of the utility model will be described in combination with the specific implementation process. First, as shown in Figure 1 Figure 1 104a in the structure shown is the aforementioned reflecting device. The dichroic filter 102a can partially transmit and partially reflect the light emitted by the primary light emitting device 101, and reflect the light generated by the wavelength conversion device 103.

[0027] The emitted light 201 emitted by the primary light emitting device 101 is split by the dichroic filter 102a. A part is transmitted as excitation light 2011 to the wavelength conversion device 103. The wavelength conversion device 103 converts the wavelength of the excitation light to obtain the excited light 301 (containing the second and third primary color light). The excited light 301 is guided to the dichroic filter 102a and reflected, which is the first emitted light 3011 shown in the figure. The part of the light 201 emitted by the light source 101 reflected by the dichroic filter 102a is the first primary color light 2012. The first primary color light 2012 is guided to the reflecting device 104a and reflected by the reflecting device 104a to become reflected light 202. The reflected light 202 is guided to the dichroic filter 102a again and becomes the second emitted light 2021 after being transmitted. The second emitted light 2021 and the first emitted light 3011 are combined together and emitted to the subsequent system. Among them, the first primary color light is usually blue light, and the second and third are usually green light and red light.

[0028] The dichroic filter 102a partially reflects and partially transmits the light emitted by the primary light emitting device 101. For example, the transmission ratio is 80%, and the reflection ratio is 20%. After the emitted light 201 reaches the dichroic filter 102a, 80% of it is transmitted, and 20% of it is reflected. In this way, 80% of the light is used for wavelength conversion, and 20% of the light is reflected by the reflecting device 104a and then partially reflected and partially transmitted by the dichroic filter 102a again. The transmission ratio is also 80%. In this way, 20% x 80% = 16% of the light 201 is guided to become the second emitted light 2021 and output.

[0029] Further, the excitation light 2011 cannot be completely converted by the wavelength conversion device 103 in practice. The unconverted part is reflected by the wavelength conversion device 103 and guided to the dichroic filter 102a again. Part of it is reflected and combined with the 2021 light, thereby increasing the brightness of the 2021 light.

[0030] Further, as shown in Figure 2 Figure 2 This embodiment adds an auxiliary light emitting device 105 and adjusts the reflecting device accordingly on the basis of the previous embodiment. In this embodiment, the reflecting device is adjusted to another dichroic filter 104b.

[0031] ​​The auxiliary light emitting device 105 emits the complementary light 401, the other dichroic filter 104b transmits the complementary light 401, and the reflected first primary color light 2012 is emitted as the reflected light 202. The complementary light 401 and the reflected light 202 are transmitted by the dichroic filter 102b to become the transmitted light 2021 and the transmitted light 4011, and are combined with the part of the excited light 301 reflected by the dichroic filter 102b, i.e., the first emitted light 3011.

[0032] As shown in the technical scheme of the utility model, Figure 3 As shown in the structure of the utility model, Figure 3 The 104a in the structure is a reflection device, the dichroic filter 102c can partially transmit and partially reflect the light emitted by the main light emitting device 101, and transmit the light generated by the wavelength conversion device 103.

[0033] The emitted light 201 emitted by the light source 101 is split by the dichroic filter 102c, a part is reflected as the excitation light 2011 to be incident on the wavelength conversion device 103, the wavelength conversion device 103 converts the wavelength of the excitation light to obtain the excited light 301 (containing second and third primary color lights), the excited light 301 is guided to the dichroic filter 102c and is transmitted, i.e., the first emitted light 3011 shown in the technical scheme. Figure 3 Among them, the second and third primary color lights are usually green light and red light.

[0034] The light 201 emitted by the light source 101 is transmitted after being split by the dichroic filter 102c, and the transmitted part is the first primary color light 2012, the first primary color light 2012 is reflected by the reflection device 104 to become the reflected light 202, the reflected light 202 is guided to the dichroic filter 102c again, and becomes the second emitted light 2021 after being reflected, the second emitted light 2021 is combined with the first emitted light 3011, and is emitted to the subsequent system for use.

[0035] For the light path structure shown in Figure 4 The other embodiment is based on the embodiment shown in Figure 3 The auxiliary light emitting device 105 is added and the reflection device is adjusted accordingly, and the reflection device is adjusted to be another dichroic filter 104b.

[0036] The auxiliary light emitting device 105 emits the complementary light 401, the other dichroic filter 104b transmits the complementary light 401, and the reflected first primary color light 2012 is emitted as the reflected light 202. The complementary light 401 and the reflected light 202 are transmitted by the dichroic filter 102b to become the transmitted light 2021 and the transmitted light 4011, and are combined with the part of the excited light 301 reflected by the dichroic filter 102b, i.e., the first emitted light 3011.

[0037] Finally, it should be noted that: the above embodiments are used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A light source, characterized in that, include: Main light-emitting device, dichroic filter, wavelength conversion device, reflection device, The reflecting device and the wavelength conversion device are located on opposite sides of the dichroic filter, and the main light-emitting device and the wavelength conversion device are located on opposite sides or on the same side of the dichroic filter. The reflected light from the reflecting device can be combined with the light generated by the wavelength conversion device and output through a dichroic filter.

2. The light source according to claim 1, characterized in that, The dichroic filter is covered with a film layer that partially transmits and partially reflects the light emitted from the main light-emitting device.

3. The light source according to claim 1, characterized in that, An auxiliary light-emitting device is added, which is placed on the same side of the dichroic filter as the reflective device.

4. The light source according to claim 3, characterized in that, The light emitted by the auxiliary light-emitting device and the light emitted by the main light-emitting device are partially reflected by the reflector and then combined together and guided to the dichroic filter. The light emitted by the auxiliary light-emitting device and the light emitted by the main light-emitting device are filtered by the dichroic filter and then combined for output.

5. The light source according to claim 4, characterized in that, The reflecting device is another dichroic filter that reflects the light generated by the main light-emitting device while transmitting the light emitted by the auxiliary light-emitting device.

Images