Laser projection device

Abstract

The invention discloses a laser projection device, which comprises a laser source module, a deflection element, a first prism and a second prism, and is characterized in that the laser source module is used for generating an input beam to be fed to the deflection element, for example, fed to a reflector in a micro-electromechanical two-dimensional scanning galvanometer; the deflection element, such as a micro electromechanical two-dimensional scanning galvanometer, is used for enabling the input beam from the laser t source to deflect towards a first scanning direction and a second scanning direction, which are orthogonal to each other so as to form a scanning beam; the first prism is used for enabling the scanning beam from the deflection element to be able to be incident from an incident surface of the first prism and penetrate through the first prism and be emitted from an emergent surface of the first prism; and the second prism is used for enabling the scanning beam emitted from the emergent surface of the first prism to be incident from an incident surface of the second prism and penetrate through the second prism and be emitted from an emergent surface of the second prism so as to perform two-dimensional scanning on an imaging surface to form an image, wherein a specific condition can be met through a relative relation of an angle between the first prism and the second prism, thereby achieving the effects of image distortion modulation and image moving and lifting at the same time.

Description

technical field [0001] The present invention relates to a laser projection device, in particular to a scanning optical path between the deflection element (micro-electromechanical two-dimensional scanning galvanometer) and the imaging surface of scanning projection, which is sequentially arranged from the galvanometer to the imaging surface. A prism and a second prism, and the relative relationship between the angles of the first prism and the second prism can meet specific conditions, so that the image frame scanned and projected on the imaging surface can simultaneously have the image distortion modulation function and the image Lift function. Background technique [0002] The projection method using a single light spot for two-dimensional scanning, such as feeding the incident light beam off-axis to the MEMS scanning mirror to scan the outgoing light beam, needs to consider the problems of image distortion correction and screen shifting at the same time. The above-mentio...

AI Technical Summary

Problems solved by technology

US8,107,147 uses two one-dimensional deflection elements to scan laser light into a two-dimensional image, wherein the deflection element or the final exit prism shares the base with the reflector that guides the light path, but the final exit prism only has a modulated image Distortion effects (see its Figure 7 -9 shown output optics 710 and its related descriptions), therefore, although US8,107,147 also adopts wedge-shaped optics (such as Figure 7 The output optical part 710 shown in -9), but it cannot have the image distortion modulation function and the image shifting function at the same time

In addition, US2010 / 0060863 uses a single or multiple prisms to be placed between the deflection element and the imaging surface. Although it discloses the combination of multiple prisms of different materials (refer to its figure 2 Two prisms 210 and 218 are shown), but the main function of using prisms is only to adjust image distortion and control the dispersion problem of multi-wavelength light. Therefore, although US2010 / 0060863 uses two prisms (such as Figure 7 210 and 218) shown in -9, in fact, there is no technical solution to achieve the purpose of correcting image distortion and screen shifting at the same time

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