WO-2026092423-A1 - LASER SPECKLE REDUCER AND PROJECTION DEVICE

WO2026092423A1WO 2026092423 A1WO2026092423 A1WO 2026092423A1WO-2026092423-A1

Abstract

The present application relates to a laser speckle reducer and a projection device. The laser speckle reducer comprises: a stator part, a vibration assembly, a first diffuser, a mover part, and a second diffuser; the stator part comprises a substrate; the vibration assembly is disposed on the substrate; the first diffuser is disposed on the substrate; the mover part comprises an elastic assembly, and the elastic assembly is connected to the substrate; the second diffuser is disposed on the elastic assembly, and the second diffuser is arranged opposite to the first diffuser; when the vibration assembly vibrates, the elastic assembly drives the second diffuser to vibrate by means of resonance, and the second diffuser is configured to move relative to the first diffuser. The present application can reduce or eliminate the effect of laser speckle, without the need for an electromagnetic system, thereby reducing the number of components and simplifying the structure.

Inventors

LEI, YANG

Assignees

深圳海翼智新科技有限公司

Dates

Publication Date: 20260507
Application Date: 20251028
Priority Date: 20241029

Claims (12)

A laser speckle eliminator, characterized in that it comprises: The stator portion includes a substrate; A vibration assembly disposed on the substrate; A first diffusion sheet is disposed on the substrate; The moving part includes an elastic component connected to the substrate; A second diffuser sheet is disposed on the elastic component, and the second diffuser sheet is disposed opposite to the first diffuser sheet. When the vibration component vibrates, the elastic component drives the second diffuser to vibrate through resonance, and the second diffuser is configured to move relative to the first diffuser.
The laser speckle eliminator according to claim 1 is characterized in that the elastic component has a first plane, the first diffuser is parallel to the first plane, the second diffuser is parallel to the first plane, the vibration component vibrates along the first plane, and the elastic component is configured to drive the second diffuser to vibrate along the first plane.
The laser speckle eliminater according to claim 2 is characterized in that the elastic component is configured to drive the second diffuser to vibrate, and the natural frequency of the second diffuser vibration is equal to the vibration frequency of the vibration component.
The laser speckle eliminator according to claim 1 is characterized in that the elastic component has a double-layer elastic structure, the double-layer elastic structure being configured to mount the second diffuser.
The laser speckle eliminator according to claim 4 is characterized in that the elastic component includes a first spring sheet and a second spring sheet, and the second diffuser sheet is sandwiched between the first spring sheet and the second spring sheet.
The laser speckle eliminator according to claim 5 is characterized in that the first spring includes a first outer ring, a first inner ring and a first cantilever, the first cantilever being configured to connect the first outer ring and the first inner ring, and the first outer ring being connected to the substrate; The second spring includes a second outer ring, a second inner ring, and a second cantilever, the second cantilever being configured to connect the second outer ring and the second inner ring, the second outer ring being connected to the substrate; The second diffuser is sandwiched between the first inner ring and the second inner ring; The first cantilever and the second cantilever are at least one of the following: frame structure, strip structure, U-shaped structure, and L-shaped structure.
According to claim 6, the laser speckle eliminator is characterized in that the elastic component further includes a connector, the connector being located between the first cantilever and the second cantilever, one end of the connector being connected to the first cantilever, and the other end of the connector being connected to the second cantilever.
According to claim 7, the laser speckle eliminator is characterized in that the first cantilever includes a first frame and a first connecting portion, the first frame having multiple first frames arranged sequentially from the inside to the outside, the first connecting portion being configured to connect two adjacent first frames; the second cantilever includes a second frame and a second connecting portion, the second frame having multiple second frames arranged sequentially from the inside to the outside, the second connecting portion being configured to connect two adjacent second frames, and one first frame and one second frame being arranged in a one-to-one correspondence; the connector has multiple connectors, some of which are configured to connect the end corners of the first frame and the end corners of the second frame, and some of which are configured to connect the first connecting portion and the second connecting portion.
The laser speckle eliminater according to claim 6 is characterized in that a first positioning part is provided on the first outer ring, a second positioning part is provided on the second outer ring, and a third positioning part is provided on the substrate, wherein the third positioning part is configured to position the first positioning part and the second positioning part.
The laser speckle eliminator according to claim 1 is characterized in that the substrate has a first surface and a second surface, the first surface and the second surface are disposed opposite to each other, the moving part is disposed on the first surface of the substrate, the vibration assembly is disposed on the second surface of the substrate, the first diffuser is disposed on the second surface of the substrate, and one side of the outer periphery of the vibration assembly is attached to one side of the outer periphery of the first diffuser.
The laser speckle eliminator according to claim 1 or 10 is characterized in that a mounting cantilever is provided on the substrate, the fixed end of the mounting cantilever is disposed adjacent to the vibration component, or the fixed end of the mounting cantilever is disposed in contact with the vibration component, and the free end of the mounting cantilever is configured to connect to an external structure.
A projection device, characterized in that it comprises: A laser source, used to generate an incident beam; and The laser speckle eliminater as described in any one of claims 1-11 is disposed in the optical path of the laser source.

Description

Laser speckle eraser and projection equipment This application claims priority to patent application filed on October 29, 2024, with application number 202422635711.8, entitled "Laser Speckle Eliminator and Projection Device", the entire contents of which are incorporated herein by reference. Technical Field This application relates to the field of projection display technology, and in particular to a laser speckle eliminater and projection device. Background Technology As a new generation of projection light source, laser has the characteristics of high brightness, good monochromaticity and small emission angle. However, due to the high coherence of laser, projection products using laser are usually accompanied by speckle phenomenon, which affects the consumer experience. Various measures have been taken in related technologies to improve the speckle problem of lasers. For example, a voice coil motor vibrates horizontally and drives a diffuser to vibrate in the same way, thereby eliminating laser speckle. To achieve horizontal vibration, a combination of electromagnetic and spring systems is required, along with a supporting structure to support the electromagnetic and spring systems, resulting in a large number of components and a relatively complex structure. Summary of the Invention The purpose of this application is to provide a device that generates vibration through a vibration component and drives the elastic component and the second diffuser to vibrate through the resonance principle, thereby creating relative motion between the second diffuser and the first diffuser, effectively improving the speckle removal effect of the laser beam, and eliminating the need for an electromagnetic system, reducing the number of components, and simplifying the structure. In a first aspect, this application provides a laser speckle eliminator, comprising: a stator portion, a vibration assembly, a first diffuser, a mover portion, and a second diffuser. The stator portion includes a substrate; the vibration assembly is disposed on the substrate; the first diffuser is disposed on the substrate; the mover portion includes an elastic assembly connected to the substrate; the second diffuser is disposed on the elastic assembly and is disposed opposite to the first diffuser; wherein, when the vibration assembly vibrates, the elastic assembly drives the second diffuser to vibrate through resonance, and the second diffuser is configured to move relative to the first diffuser. In one possible implementation, the elastic component has a first plane, a first diffuser plate is parallel to the first plane, a second diffuser plate is parallel to the first plane, a vibration component vibrates along the first plane, and the elastic component is configured to drive the second diffuser plate to vibrate along the first plane. In one possible implementation, the elastic component is configured to drive the second diffuser to vibrate, the natural frequency of which is equal to the vibration frequency of the vibrating component. In one possible implementation, the elastic component has a double-layer elastic structure for mounting a second diffuser sheet. In one possible implementation, the elastic component includes a first spring and a second spring, with a second diffuser sandwiched between the first spring and the second spring. In one possible implementation, the first spring includes a first outer ring, a first inner ring, and a first cantilever, the first cantilever being configured to connect the first outer ring and the first inner ring, the first outer ring being connected to a substrate; the second spring includes a second outer ring, a second inner ring, and a second cantilever, the second cantilever being configured to connect the second outer ring and the second inner ring, the second outer ring being connected to a substrate; a second diffuser is sandwiched between the first inner ring and the second inner ring; the first cantilever and the second cantilever are at least one of a frame structure, a strip structure, a U-shaped structure, and an L-shaped structure. In one possible implementation, the resilient component further includes a connector located between the first cantilever and the second cantilever, with one end of the connector connected to the first cantilever and the other end connected to the second cantilever. In one possible implementation, the first cantilever includes a first frame and a first connecting portion. Multiple first frames are arranged sequentially from the inside out. The first connecting portion is configured to connect two adjacent first frames. The second cantilever includes a second frame and a second connecting portion. Multiple second frames are arranged sequentially from the inside out. The second connecting portion is configured to connect two adjacent second frames. One first frame and one second frame are arranged in a one-to-one correspondence. Multiple connectors are provided. Some