CN214540362U - Optical fiber coupling and high-definition laser projection module - Google Patents

Abstract

A laser projection module with high definition and optical fiber coupling is provided. The light source module is a light source emitting end and a control end, the light source module comprises a red light laser diode R, a green light laser diode G, a blue light laser diode B and an optical fiber coupler, the red light laser diode R, the green light laser diode G and the blue light laser diode B are respectively and electrically connected with a driving current and driven by the driving current, and the optical fiber coupler comprises three light input ends and a combined optical fiber end; the beam shaping module comprises a first diaphragm, a second focusing lens, a third pinhole, a fourth focusing lens, a fifth collimating lens and a sixth diaphragm which are sequentially arranged. This laser projection module's light source light beam adopts optic fibre to couple for the light source light beam closes to restraint the convenience, sets up diaphragm and mechanical pinhole simultaneously and carries out the beam shaping, is the high laser projection module of projection definition.

Description

Optical fiber coupling and high-definition laser projection module

Technical Field

The utility model relates to a laser projection equipment, especially a light source light beam adopt the optical fiber coupling, set up diaphragm and mechanical pinhole simultaneously and carry out the light beam plastic, make the high laser projection module of projection definition.

Background

The scanning laser projector combines the brightness and chromaticity of three different color beams by using a three-primary-color laser module to generate pixels, and the pixels are reflected by a vibrating mirror and form a matrix scanning on an imaging screen by the vibrating mirror to form a projection on an imaging surface.

There are two technical difficulties with this type of projection system:

1. the shaping of light beams is complex, and each light source beam of the tricolor light generally needs to be collimated, so that the difficulty of laser beam combination is high;

2. due to the fact that the outline of the light spot after the beam combination is poor, the problems of projection image ghosting, poor color saturation and the like are caused.

Disclosure of Invention

The utility model aims at solving the technical problem, a laser projection module that optical fiber coupling and definition are high is provided, and this laser projection module's light source light beam adopts optic fibre to carry out the coupling for it is convenient that the light source light beam closes to restraint, sets up diaphragm and mechanical pinhole simultaneously and carries out the beam shaping, is a laser projection module that the projection definition is high.

The utility model discloses among the technical scheme, LD is laser diode.

In order to solve the above-mentioned prior art problem, the technical scheme of the utility model is that:

the utility model relates to a laser projection module that optical fiber coupling and definition are high, it includes light source module, light beam plastic module, light beam scanning module, plane of projection 6, light source module is light source transmitting terminal and control end, light source module includes ruddiness laser diode R11, green glow laser diode G12, blue light laser diode B13, optical fiber coupler 2, ruddiness laser diode R, green glow laser diode G, blue light laser diode B are connected with the drive current electricity respectively and through the drive current drive, optical fiber coupler 2 includes three light input ends and a combination optical fiber end, ruddiness laser diode R, green glow laser diode G, blue light laser diode B's output is connected a light input end respectively, three primary colors light that ruddiness laser diode R, green glow laser diode G, blue light laser diode B sent get into through the light input end, combining the combined light beam into a combined light beam through the combined optical fiber end, wherein the combined light beam is a conical light beam with a certain divergence angle;

the light beam shaping module comprises a first diaphragm 31, a second focusing lens 32, a third pinhole 33, a fourth focusing lens 34, a fifth collimating lens 35 and a sixth diaphragm 36 which are sequentially arranged, wherein a conical light beam emitted from the optical fiber coupler passes through the first diaphragm, the first diaphragm is used for limiting stray light of the outer diameter, then the conical light beam is converged to the third pinhole through the second focusing lens, the light beam passing through the third pinhole is diverged again, then the conical light beam is collimated through the fourth focusing lens and the fifth collimating lens and emits a narrow parallel light beam, the parallel light beam is a light beam which cannot be diverged after being transmitted for a long distance or has a small divergence angle, and then the stray light of the outer diameter of the parallel light beam is filtered through the sixth diaphragm again;

the light beam scanning module shakes mirror 4, focusing lens 5 including the scanning, the scanning shakes the mirror and sets up in the exit end that six diaphragms are quick, focusing lens sets up in the below that the scanning shakes the mirror, and the narrow parallel beam who shakes through six filterable narrow parallel beam outgoing of above-mentioned diaphragms shakes the mirror to the scanning, and the scanning shakes the mirror and carries out the matrix scanning to focusing lens direction with certain frequency, and focusing lens focuses on again and form little facula on the plane of projection narrow parallel beam, and the matrix scanning that shakes the mirror through the scanning, and then forms the projection at the plane of projection by the little facula of matrix arrangement.

The second focusing lens 32 and the fourth focusing lens 34 are biconvex lenses;

the collimating lens five 35 is a biconcave lens.

The utility model relates to a laser projection module that optical fiber coupling and definition are high, its beneficial effect has:

1. the laser light source beams are coupled into the optical fibers in an optical fiber output mode, and the outputs of the laser light sources LD are combined by using an optical fiber beam combining device, so that the beam combining difficulty of the LDs is greatly reduced, the LDs output by the optical fibers do not need specific installation positions, and the integration level of the whole projection system is higher;

2. the diaphragm is adopted to limit the size of the light beam, redundant stray light is filtered, meanwhile, the mechanical pinhole is adopted as a filter, the stray light is effectively eliminated, the image quality is improved, and the overall definition of the laser projection module is high.

Drawings

Fig. 1 is a view of the optical path structure of the laser projection module with high definition and optical fiber coupling according to the present invention.

Detailed Description

The invention will be further described with reference to the following examples:

example (b):

referring to fig. 1, the present invention relates to an optical fiber coupled high definition laser projection module, which comprises a light source module, a light beam shaping module, a light beam scanning module, and a projection surface, wherein the light source module is a light source emitting end and a control end, the light source module comprises a red light laser diode R, a green light laser diode G, a blue light laser diode B, and an optical fiber coupler, the red light laser diode R, the green light laser diode G, and the blue light laser diode B are electrically connected to a driving current and driven by the driving current, the optical fiber coupler comprises three light input ends and a combined optical fiber end, the output ends of the red light laser diode R, the green light laser diode G, and the blue light laser diode B are respectively connected to a light input end, the three primary colors of light emitted by the red light laser diode R, the green light laser diode G, and the blue light laser diode B enter through the light input ends, combining the combined light beam into a combined light beam through the combined optical fiber end, wherein the combined light beam is a conical light beam with a certain divergence angle;

the light beam shaping module comprises a first diaphragm, a second focusing lens, a third pinhole, a fourth focusing lens, a fifth collimating lens and a sixth diaphragm which are sequentially arranged, a conical light beam emitted from the optical fiber coupler passes through the first diaphragm, the first diaphragm is used for limiting stray light with an outer diameter, then the stray light is converged to the third pinhole through the second focusing lens, the light beam passing through the third pinhole is diverged again, then the light beam passes through the fourth focusing lens and the fifth collimating lens to be collimated and emit a narrow parallel light beam, the parallel light beam is a light beam which cannot be diverged after being transmitted for a long distance or has a small divergence angle, and then the stray light with the outer diameter of the parallel light beam is filtered through the sixth diaphragm again;

the light beam scanning module shakes mirror, focusing lens including the scanning, the scanning shakes the mirror and sets up in the exit end of six diaphragms, focusing lens sets up in the below of the scanning mirror that shakes, and the narrow parallel light beam through six filterable of above-mentioned diaphragms is emergent to the scanning mirror that shakes, and the scanning shakes the mirror and carries out the matrix with certain frequency and scan to focusing lens direction, and focusing lens focuses on once more and form little facula on the plane of projection narrow parallel light beam, and the matrix through the scanning mirror that shakes scans, and then forms the projection at the plane of projection by the little facula of matrix arrangement.

Further, the second focusing lens and the fourth focusing lens are biconvex lenses;

further, the collimating lens five is a biconcave lens.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the invention, i.e. the present invention is intended to cover all equivalent variations and modifications within the scope of the present invention.

Claims (3)

1. The utility model provides a laser projection module that optical fiber coupling and definition are high which characterized in that:

the light source module is a light source emitting end and a control end, the light source module comprises a red light laser diode R, a green light laser diode G, a blue light laser diode B and an optical fiber coupler, the red light laser diode R, the green light laser diode G and the blue light laser diode B are respectively and electrically connected with a driving current and driven by the driving current, the optical fiber coupler comprises three light input ends and a combined optical fiber end, the output ends of the red light laser diode R, the green light laser diode G and the blue light laser diode B are respectively connected with one light input end, three primary color lights emitted by the red light laser diode R, the green light laser diode G and the blue light laser diode B enter through the light input ends and are combined into a combined light beam through the combined optical fiber ends, the combined beam is a conical beam with a certain divergence angle;

the light beam shaping module comprises a first diaphragm, a second focusing lens, a third pinhole, a fourth focusing lens, a fifth collimating lens and a sixth diaphragm which are sequentially arranged, a conical light beam emitted from the optical fiber coupler passes through the first diaphragm, the first diaphragm is used for limiting stray light with an outer diameter, then the stray light is converged to the third pinhole through the second focusing lens, the light beam passing through the third pinhole is diverged again, then the light beam passes through the fourth focusing lens and the fifth collimating lens to be collimated and emit a narrow parallel light beam, the parallel light beam is a light beam which cannot be diverged after being transmitted for a long distance or has a small divergence angle, and then the stray light with the outer diameter of the parallel light beam is filtered through the sixth diaphragm again;

the light beam scanning module shakes mirror, focusing lens including the scanning, the scanning shakes the mirror and sets up in the exit end of six diaphragms, focusing lens sets up in the below of the scanning mirror that shakes, and the narrow parallel light beam through six filterable of above-mentioned diaphragms is emergent to the scanning mirror that shakes, and the scanning shakes the mirror and carries out the matrix with certain frequency and scan to focusing lens direction, and focusing lens focuses on once more and form little facula on the plane of projection narrow parallel light beam, and the matrix through the scanning mirror that shakes scans, and then forms the projection at the plane of projection by the little facula of matrix arrangement.

2. The optical fiber coupled high definition laser projection module as claimed in claim 1, wherein the second and fourth focusing lenses are biconvex lenses.

3. The fiber-coupled high-definition laser projection module of claim 1, wherein the collimating lens five is a biconcave lens.

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