Projection lamp

Abstract

The utility model belongs to the technical field of light sources, and provides a projection lamp which comprises a light source device, a light modulator and a lens, the light source device comprises a light source, a collecting unit and a light condensing device, the light source is used for emitting light, the collecting unit is used for receiving the light and collecting the light, and the light condensing device is used for condensing the light. The light uniformizing unit is used for uniformizing the light rays, and the light gathering device is used for gathering the light rays penetrating through the light uniformizing unit. The light modulator is located at the focal point of the light and used for modulating the light into image light, and the lens is used for projecting the image light. The whole projection lamp is low in cost, good in uniformity, high in efficiency and convenient to install.

Description

Technical Field

[0001] This application relates to the field of light source technology, specifically to a projection lamp. Background Technology

[0002] LED light source modules are solid-state cold light sources, characterized by high luminous efficacy, long lifespan, instantaneous illumination, high integration, and ease of matching with secondary optics. The lamps are small in size and can be intelligently and digitally designed via electronic circuits, making them easy to carry and install. Their applications are wider and more convenient. As LED efficiency continues to increase, LED light sources are gradually replacing traditional gas discharge bulbs, becoming the primary light source for lighting applications.

[0003] Current projection lamp light sources typically consist of a light source module composed of multiple COB LED chips. Light is first collected by an aspherical lens and then a second by a Fresnel lens before being emitted as projection light. However, this type of projection lamp system has the following shortcomings: First, the emitted light from the light source module has a large divergence angle, resulting in poor parallelism when using a Fresnel lens for light collection, making subsequent optical path processing difficult. Second, the optical uniformity of the projection lamp system is low; there is no effective light homogenizing system, and only a light homogenizer can be inserted, which is ineffective. Furthermore, the system efficiency is also low. Improvements are urgently needed. Utility Model Content

[0004] This application provides a projection lamp to at least partially improve the above-mentioned technical problems.

[0005] In a first aspect, embodiments of this application provide a projection lamp, including a light source device, a light modulator, and a lens. The light source device includes a light source, a collecting unit, a light homogenizing unit, and a light focusing device. The light source emits light, the collecting unit receives and collects the light, the light homogenizing unit homogenizes the light, and the light focusing device converges the light transmitted through the light homogenizing unit. The light modulator is located at the focal point of the light and modulates the light into image light, and the lens projects the image light.

[0006] In some embodiments, the projection lamp further includes a field lens for receiving homogenized light and for modulating the angle or focal length of the light.

[0007] In some embodiments, the collecting unit includes a first collecting unit for collecting light emitted from the light source.

[0008] In some embodiments, the light source includes multiple light-emitting units, and the first collection unit includes multiple first collection units, which are arranged in a one-to-one correspondence with the multiple light-emitting units.

[0009] In some embodiments, the collecting unit further includes a second collecting unit for collecting light transmitted through the first collecting unit.

[0010] In some embodiments, the second collection unit includes a plurality of second collection units, which are configured in a one-to-one correspondence with the plurality of first collection units.

[0011] In some embodiments, the light-diffusing unit is a rectangular compound eye lens.

[0012] In some embodiments, the light-emitting unit is a monochromatic light source or a multicolor light source.

[0013] In some embodiments, the plurality of light-emitting units are arranged in a rotating manner.

[0014] In some embodiments, the light modulator is an LCD, and the projection lamp further includes a polarizing device disposed in the optical path of the light rays converged by the light focusing device. The light modulator receives the light rays transmitted through the polarizing device and modulates them into image light.

[0015] The projection lamp provided in this application embodiment has a simple structure. It collects and homogenizes light by setting up a collection unit and a light homogenizing unit, thereby improving the uniformity and collimation of the light. By setting up a focusing device, the collimation of the light is further improved. The entire projection lamp is inexpensive, has good uniformity, high efficiency, and is easy to install. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a projection lamp proposed in Embodiment 1 of this application.

[0018] Figure 2 This is a schematic diagram of the structure of a light source device in a projection lamp according to Embodiment 2 of this application. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without inventive effort are within the scope of protection of the present application.

[0020] In this application, unless otherwise expressly specified or limited, the terms "installation," "connection," "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components; they can refer to mere surface contact; or they can refer to surface contact connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0021] Furthermore, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as referring to specific or particular structures. The terms "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this application, as well as the features of different embodiments or examples.

[0022] Current projection lamp light sources typically consist of a light source module composed of multiple COB LED chips. Light is first collected by an aspherical lens and then a second by a Fresnel lens before being emitted as projection light. However, this type of projection lamp system has the following shortcomings: First, the emitted light from the light source module has a large divergence angle, resulting in poor parallelism when using a Fresnel lens for light collection, making subsequent optical path processing difficult. Second, the optical uniformity of the projection lamp system is low; there is no effective light homogenizing system, and only a light homogenizer can be inserted, which is ineffective. Furthermore, the system efficiency is also low. Improvements are urgently needed.

[0023] Based on this, the inventors of this application propose a projection lamp in order to improve the above-mentioned technical problems.

[0024] Example 1

[0025] See Figure 1This embodiment provides a projection lamp 10, which includes a light source device 20, a light modulator 11, and a lens 12.

[0026] Further reading Figure 2 The light source device 20 includes a light source 30, a collecting unit 40, a light homogenizing unit 50, and a light focusing device 60. The light source 30 is used to emit light, the collecting unit 40 is used to collect light, the light homogenizing unit 50 is used to homogenize light, and the light focusing device 60 is used to focus the light that has passed through the light homogenizing unit 50.

[0027] The light source 30 includes a light-emitting unit 32 and a substrate 31. The light-emitting unit 32 is disposed on the substrate 31 and is used to emit light. The light-emitting unit 32 can be a monochromatic light source, such as a blue light source, a red light source, or a green light source. In particular, the light-emitting unit 32 can be an LED light source or a laser light source. Correspondingly, the light-emitting unit 32 can emit primary color light such as blue light, red light, or green light. In some embodiments, the light-emitting unit 32 can also be a white light source, for example, a white light source synthesized by a blue light source exciting a yellow phosphor light source and the resulting yellow excitation light and blue light. This embodiment does not limit this. In addition, the light-emitting unit 32 can also be a multicolor light source, that is, the light-emitting unit 32 can emit light containing multiple primary color lights. For example, in a more specific embodiment, the light-emitting unit 32 can be a yellow light source emitting red and green light, a cyan light source emitting blue and green light, etc.

[0028] Each light-emitting unit 32 can be a lamp bead or an LED chip. Multiple light-emitting units 32 can be arranged side by side or in an array, and this embodiment does not limit this. Specifically, in this embodiment, as an example only, multiple light-emitting units 32 can be arranged in a rotating manner. This arrangement can make the light emitted by each light-emitting unit 32 have high uniformity when emitted.

[0029] The collecting unit 40 is disposed in the optical path from which the light is emitted. The collecting unit 40 is used to receive the light and collect the light, that is, to converge the light, which can improve the collimation of the light and facilitate the subsequent optical path to utilize the light, thereby improving the light utilization rate. Specifically, in this embodiment, the collecting unit 40 includes a first collecting unit 41, which is used to collect the light emitted from the light source.

[0030] Specifically, the first collecting unit 41 includes a plurality of first collecting sub-units 42, each corresponding to one of the plurality of light-emitting units 32. Each first collecting sub-unit 42 is used to collect and collimate the light emitted from its corresponding light-emitting unit 32. In this embodiment, the first collecting sub-unit 42 may be a lens for converging the light emitted from the light-emitting unit 32. In other embodiments, the number of first collecting sub-units 42 may be other values, which are not limited in this embodiment.

[0031] In this embodiment, in order to further improve the ability to collect and converge light and improve the optical collimation, the collecting unit 40 includes a second collecting unit 43, which is used to collect the light transmitted through the first collecting unit 41.

[0032] Specifically, the second collecting unit 43 includes a plurality of second collecting sub-units 44, which are arranged one-to-one with the plurality of first collecting sub-units 42. Each second collecting sub-unit 44 is used to collect and collimate the light transmitted through its corresponding first collecting sub-unit 42. In this embodiment, the second collecting sub-unit 44 may be a lens for converging the light emitted from the light-emitting unit 32. In other embodiments, the number of second collecting sub-units 44 may be other values, which are not limited in this embodiment.

[0033] The light homogenizing unit 50 is disposed in the optical path of the light emitted after being collected by the collecting unit 40. The light homogenizing unit 50 is used to receive the light collected by the collecting unit 40 and homogenize the light to make the light more uniform. Since the light has already been collected and collimated by the collecting unit 40 in the preceding optical path, the light homogenizing unit 50 has a better homogenization effect on the light and the uniformity of the light is better.

[0034] The light-diffusing unit 50 can be a compound eye lens, such as a double compound eye lens or a single compound eye lens, etc., and this embodiment does not limit this. In this embodiment, since most current projection devices use LCDs as light modulators, and LCDs are usually rectangular in structure, a rectangular compound eye is selected for the light-diffusing unit 50 to facilitate the application of the light source device to the projection device. It is understood that in some other embodiments, the light-diffusing unit 50 can also be other light-diffusing devices, and this embodiment does not limit this. In some other embodiments, the light-diffusing unit 50 can also be a diffuser.

[0035] A focusing device 60 is disposed in the optical path of the light after it passes through the light homogenizing unit 50. The focusing device 60 is used to converge the light passing through the light homogenizing unit 50 to adjust the light spot to an appropriate range for use. The light converged by the focusing device 60 is adjusted to a state suitable for subsequent use.

[0036] To further improve the ability to modulate light so that the focal point of the light can be matched with the light modulator 11, the projection lamp 10 may also include a field lens 70. The field lens 70 is disposed in the optical path after the focusing device 60 and is used to modulate the homogenized light to adjust the angle or focal length of the light, and thus modulate the focal point of the light onto the corresponding light modulator 11.

[0037] The projection lamp 10 provided in this embodiment has a simple structure. The light source device 20 collects and homogenizes light by setting up a collection unit 40 and a light homogenizing unit 50, thereby improving the uniformity and collimation of the light. By setting up a focusing device 60, the collimation of the light is further improved. By setting up a field lens 70, it can be matched to different application scenarios according to different angle and focal length requirements. The entire light source device 20 is low in cost, has good uniformity, high efficiency, and is easy to install.

[0038] The projection lamp also includes a light modulator 11 and a lens 12. The light modulator 11 is located at the focal point of the light beam and is used to modulate the light beam emitted from the light source device 20 into image light. In this embodiment, the light modulator 11 is an LCD. The projection lamp 11 also includes a polarizing device (not shown). The polarizing device is disposed in the optical path of the light beam converged by the focusing device and can modulate the light beam into polarized light suitable for LCD applications. For example, if the light beam is white light, after passing through the polarizing device, the light beam is modulated into single-polarized light, such as S-light or P-light. The light modulator receives the light beam transmitted through the polarizing device and modulates it into image light. In some embodiments, the polarizing device can be disposed independently of the light modulator 11; in other embodiments, the polarizing device can be disposed together with the light modulator 11. This embodiment does not limit this.

[0039] It is understood that in other embodiments, the light modulator may also be a DMD, LCOS, or other similar device, and the light modulator 11 may also be a patterned sheet with a cutout design or a patterned filter. This embodiment does not limit this. The lens 12 is used to project the image light, and the lens 12 may include one or more lens groups; this embodiment does not limit this.

[0040] In other embodiments, the projection lamp 10 may also include other components, which are not limited in this embodiment.

[0041] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A projection lamp, characterized in that, include: A light source device includes a light source, a collecting unit, a light homogenizing unit, and a light focusing device. The light source is used to emit light, the collecting unit is used to receive and collect the light, the light homogenizing unit is used to homogenize the light, and the light focusing device is used to focus the light transmitted through the light homogenizing unit. An optical modulator, located at the focal point of the light beam, is used to modulate the light beam into image light; as well as A lens, used to project the image light.

2. The projection lamp according to claim 1, characterized in that, The projection lamp also includes a field lens, which is used to receive the homogenized light and to modulate the angle or focal length of the light.

3. The projection lamp according to claim 1, characterized in that, The collection unit includes a first collection unit for collecting light emitted from the light source.

4. The projection lamp according to claim 3, characterized in that, The light source includes multiple light-emitting units, and the first collection unit includes multiple first collection units, which are arranged in a one-to-one correspondence with the multiple light-emitting units.

5. The projection lamp according to claim 4, characterized in that, The collection unit further includes a second collection unit for collecting light transmitted through the first collection unit.

6. The projection lamp according to claim 5, characterized in that, The second collection unit includes a plurality of second collection units, which are configured in a one-to-one correspondence with the plurality of first collection units.

7. The projection lamp according to any one of claims 1-6, characterized in that, The light-diffusing unit is a rectangular compound eye lens.

8. The projection lamp according to any one of claims 4-6, characterized in that, The light-emitting unit is a monochromatic light source or a multicolor light source.

9. The projection lamp according to claim 8, characterized in that, Multiple light-emitting units are arranged in a rotating manner.

10. The projection lamp according to claim 1, characterized in that, The light modulator is an LCD, and the projection lamp also includes a polarizing device. The polarizing device is disposed in the optical path of the light after it has been focused by the light-gathering device. The light modulator receives the light transmitted through the polarizing device and modulates it into image light.

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