CN111189000B - lighting device - Google Patents

Abstract

An illumination device includes a light source and an optical device. The light source is used for emitting light. The optical device is used for providing uniform light with at least one indicating mark after receiving the light. The optical device includes a diffusion portion and a guide portion. The diffusion part is used for providing uniform light. The guide part is used for providing at least one indication mark.

Description

lighting device

technical field

Embodiments of the present invention relate to a lighting device, and in particular to a lighting device for providing uniform light with at least one indicating mark.

Background technique

In some cases, beam shaping is desired to achieve a uniform intensity distribution of light for illumination, and it contains some indicator marks for fast field of view (FOV) calibration . However, according to the prior art, usually more than one optical element is required in addition to the light source to meet such requirements. For example, an optical element, such as a diffuser, is required to achieve uniform light distribution, and another optical element is required to provide indicator marks, such as spots.

Contents of the invention

The purpose of the present invention is to provide an illuminating device, including a light source and an optical device. The light source is used to emit light. The optical device is used for providing uniform light with at least one indicator mark after receiving light. The optical device includes a diffusion part and a guide part. The diffuser is used to provide uniform light. The guiding part is used for providing at least one indicator mark.

In some embodiments, the above illumination device further includes a collimating mirror disposed between the light source and the optical device, and the collimating mirror is used for concentrating light.

In some embodiments, the light source is a light-emitting diode (Light-emitting diode, LED), a vertical-cavity surface-emitting laser (Vertical-Cavity Surface-Emitting Laser, VCSEL) or a laser diode (Laser Diode, LD).

In some embodiments, the diffusion part has a subwavelength structure.

In some embodiments, the diffusion portion has a surface relieved structure.

In some embodiments, the diffusing part is a diffractive optical element (DOE).

In some embodiments, the diffusion part is a microlens array.

In some embodiments, the guiding part is a diffractive optical element (DOE).

In some embodiments, the guiding part is at least one lens or a microlens array.

In some embodiments, the diffuser is a microprism.

Description of drawings

A more complete understanding of the present invention can be obtained by reading the following detailed description of the embodiments, and by reference to the accompanying figures that follow.

Fig. 1 is a schematic structural diagram of a lighting device according to a first embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a lighting device according to a second embodiment of the present invention.

Fig. 3 is a perspective view of an optical device of a lighting device according to a second embodiment of the present invention.

Explanation of reference signs:

100, 200: Lighting device

120, 220: light source

140, 240: Optical device

160: collimating mirror

242: Diffusion Department

244: Guide

Detailed ways

The following is described in detail through the embodiments with accompanying drawings, but the provided embodiments are not intended to limit the scope of the present invention, and the description of the structural operation is not intended to limit the order of its execution, any structure recombined by components, The resulting devices with equivalent effects are within the scope of the present invention. In addition, the drawings are for illustration purposes only and are not drawn to original scale.

Fig. 1 is a schematic structural diagram of a lighting device 100 according to a first embodiment of the present invention. The lighting device 100 includes a light source 120 and an optical device 140 . The light source 120 is used to emit light. The light source 120 can be a light emitting diode (LED), a vertical cavity surface emitting laser (VCSEL) or a laser diode (LD). The optical device 140 is a diffractive optical element (DOE) for providing uniform light with at least one indicator mark after receiving light.

In the first embodiment of the present invention, a diffractive optical element (DOE) can be used as a diffuser to provide uniform light after receiving the light. In the first embodiment of the present invention, the diffractive optical element (DOE) can also be used as a pattern generator, and light passes through the diffractive optical element (DOE) to generate a projected image, wherein the projected image can have The optical element (DOE) is set to have a specific pattern with at least one indicator mark.

In the first embodiment of the present invention, the illuminating device 100 may optionally include a collimating mirror 160 disposed between the light source 120 and the optical device 140 . The collimating mirror 160 is used to condense light. The optical device 140 , namely a diffractive optical element (DOE), is used to provide uniform light with at least one indicator mark after receiving the focused light.

Fig. 2 is a schematic structural diagram of a lighting device 200 according to a second embodiment of the present invention. The lighting device 200 includes a light source 220 and an optical device 240 . The light source 220 is used to emit light. The light source 220 can be a light emitting diode (LED), a vertical cavity surface emitting laser (VCSEL) or a laser diode (LD).

The optical device 240 includes a diffusion part 242 and a guide part 244 . The diffusion part 242 and the guide part 244 are disposed on opposite sides of the optical device 240 . FIG. 3 is a perspective view of an optical device 240 of a lighting device 200 according to a second embodiment of the present invention. The diffuser 242 of the optical device 240 of the illuminating device 200 is a microlens array for providing uniform light. The diffuser 242 of the optical device 240 of the lighting device 200 has a plurality of concave spherical structures periodically disposed on a surface of the optical device 240 of the lighting device 200 . The configuration and/or surface shape of the microlens array can be adjusted to change the field of view (FOV) or light intensity distribution.

The guide part 244 of the optical device 240 of the lighting device 200 includes at least one lens for providing at least one indicator mark. As shown in FIG. 3, the guide portion 244 includes four lenses, thereby providing four index marks. It should be noted that the number of lenses is adjustable, thereby changing the number of index marks. It should be noted that the position of the lens is adjustable, thereby changing the position of the index mark.

In some embodiments of the invention, the lighting device includes a light source and an optical device. The light source is used to emit light. The optical device is used for providing uniform light with at least one indicator mark after receiving light. The optical device includes a diffusion part and a guide part. The diffuser may have a subwavelength structure or a surface relieved structure, or the diffuser may be a diffractive optical element (DOE) or a microlens array. The diffuser is used to provide uniform light. The guiding part can be a diffractive optical element (DOE), at least one lens, a microlens array or a microprism. The guiding part is used for providing at least one indicator mark.

In summary, the present invention proposes a lighting device, which includes a single light source device for providing uniform light with at least one indicator mark. The present invention does not require two separate optical devices, one for providing uniform light and one for providing at least one indicator mark.

Although the invention has been described in considerable detail with reference to specific embodiments thereof, other embodiments are possible. Therefore, the spirit and scope of the appended claims should not be limited to the description of the examples contained herein. It is obvious to those skilled in the art that various modifications and changes can be made to the structure of the present invention without departing from the scope or spirit of the present invention. In view of the above, the present invention should cover the modifications and changes of the provided inventions, and these modifications and changes all fall within the scope of the claims of this application.

Claims (7)

1. An illumination device, comprising:

a light source for emitting light;

an optical device for providing a uniform light having at least one indication mark after receiving the light; and

a collimating lens disposed between the light source and the optical device for condensing light, wherein the optical device comprises:

a diffusion part for providing the uniform light after receiving the focused light; and

a guiding part for providing the at least one indication mark, wherein the guiding part is a diffractive optical element or at least one lens or a micro-lens array, and the diffusion part and the guiding part are disposed on opposite sides of the optical device.

2. The illumination device of claim 1, wherein the light source is a light emitting diode, a vertical cavity surface emitting laser, or a laser diode.

3. The illumination device according to claim 1, wherein the diffusion portion has a primary wavelength structure.

4. The illumination device according to claim 1, wherein the diffusion portion has a surface relief microstructure.

5. The illumination device according to claim 1, wherein the diffusion portion is a diffractive optical element.

6. The illumination device according to claim 1, wherein the diffusion portion is a microlens array.

7. The illumination device of claim 1, wherein the diffuser is a microprism.

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