CN213182212U - AOI detects bright low-cost light path structure of superelevation based on DLP technique - Google Patents

Abstract

The utility model relates to an AOI detection ultra-bright low-cost light path structure based on DLP technology, which comprises a light source component, a light-homogenizing light path, a DMD chip and a lens module; the light source component comprises a laser light source and a laser processing light path; the dodging light path comprises an integrating column and an imaging lens group; the lens module is a Samm lens; the laser light source is adopted, the light beam processed by the laser processing light path is emitted to the inlet of the integrating column, and is reflected for multiple times in the integrating column, finally, a light spot with uniform brightness is formed at the outlet of the integrating column, and the light spot forms a rectangular light spot with uniform brightness on the DMD chip through the imaging lens group, so that the overall size and cost are both considered while ultrahigh brightness is ensured, the radiator can be made small and exquisite, a fan is not needed for radiating, and vibration is avoided; and the interior of the DMD chip is formed by physical structures such as a mechanical hinge, a micro aluminum mirror and the like, and the service life of the DMD chip is not influenced by blue light.

Description

AOI detects bright low-cost light path structure of superelevation based on DLP technique

Technical Field

The utility model relates to a AOI detects technical field, and more specifically says, relates to a AOI detects bright low-cost light path structure of superelevation based on DLP technique.

Background

Currently, in the field of automatic Optical inspection (aoi) (automated Optical inspection), LCOS chips are mostly used as display devices. The LCOS chip is a polarizer, and there is a necessary process to convert the natural light emitted from the LED into linearly polarized light, and the luminance of the process is lost by about 50%, resulting in insufficient luminance of the whole system. For example, the utility model patent CN203178659U is an example of using LCOS projection.

The defect that LCOS brightness is insufficient in the existing market is overcome mainly by improving input power of an LED, the size of a heat dissipation body of the LED needs to be increased and a heat dissipation fan needs to be used, the two solutions not only increase the size of a system and increase the cost, but also form detection noise due to shaking of a projection picture caused by vibration of the fan during working, and therefore the complexity of an algorithm is increased and the signal to noise ratio is reduced.

In addition, the liquid crystal molecules in the LCOS are prone to aging in the blue wavelength band, which is likely to cause irreversible damage to the LCOS and decrease in reliability.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, to prior art's above-mentioned defect, provide an AOI based on DLP technique detects bright low-cost light path structure of superelevation.

The utility model provides a technical scheme that its technical problem adopted is:

constructing an AOI (automated optical inspection) ultra-bright low-cost light path structure based on a DLP (digital light processing) technology, wherein the AOI ultra-bright low-cost light path structure comprises a light source assembly, a uniform light path, a DMD (digital micromirror device) chip and a lens module; the light source component comprises a laser light source and a laser processing light path for processing emergent rays of the laser light source; the light homogenizing light path comprises an integrating column for homogenizing emergent light of the laser processing light path and an imaging lens group; after the emergent light spot of the integrating column passes through the imaging lens group, a conjugate light spot is formed at the DMD chip; emergent light rays of the DMD chip are imaged on the lens module, the lens module is a Schlemm lens, and the angle between the plane where the effective surface of the DMD chip is located, the perpendicular line of the Schlemm lens and the projection surface of the Schlemm lens meets the Schlemm's law.

AOI detects bright low-cost light path structure of superelevation based on DLP technique, wherein, still include RTIR prism group, RTIR prism group is used for adjusting the emergent ray angle of formation of image mirror group, and will the emergent ray reflection of DMD chip extremely formation of image on the camera lens module.

AOI detects super bright low-cost light path structure based on DLP technique, wherein, RTIR prism group is including the primary prism that is isosceles right triangle, a right angle face of primary prism with there is the contained angle in the effective face of DMD chip, the contained angle scope is 1-5 degrees.

AOI detects bright low-cost light path structure of superelevation based on DLP technique, wherein, RTIR prism group is including adjusting the compensating prism of the incident light angle of main prism.

AOI detects bright low-cost light path structure of superelevation based on DLP technique, wherein, laser beam treatment light path includes expands the beam light path to the laser of laser beam compression, and right the emergent ray that the light path was expanded to laser converges into the light path that converges of facula.

AOI detects bright low-cost light path structure of superelevation based on DLP technique, wherein, laser beam expands the light path and includes right the parallel light that laser source sent carries out the positive lens that converges, with positive lens converges back light and diverges into the negative lens of parallel light again.

The utility model discloses an AOI based on DLP technique detects super bright low-cost light path structure, wherein, laser beam processing light path still includes speckle elimination component; the speckle eliminating component comprises a diffusion sheet for destroying the original coherence of the laser beam and a motor for driving the laser beam to rotate.

The beneficial effects of the utility model reside in that: the laser light source is adopted, the light beam processed by the laser processing light path is emitted to the inlet of the integrating column, and is reflected for multiple times in the integrating column, finally, a light spot with uniform brightness is formed at the outlet of the integrating column, and the light spot forms a rectangular light spot with uniform brightness on the DMD chip through the imaging lens group, so that the overall size and cost are both considered while ultrahigh brightness is ensured, the radiator can be made small and exquisite, a fan is not needed for radiating, and vibration is avoided; and the interior of the DMD chip is formed by physical structures such as a mechanical hinge, a micro aluminum mirror and the like, and the service life of the DMD chip is not influenced by blue light.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described with reference to the accompanying drawings and embodiments, wherein the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive efforts according to the drawings:

fig. 1 is a structural schematic diagram of the AOI detection ultra-bright low-cost optical path structure based on the DLP technology according to the preferred embodiment of the present invention;

fig. 2 is the utility model discloses preferred embodiment's AOI based on DLP technique detects bright low-cost light path structure laser beam expanding light path schematic diagram of superelevation.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, a clear and complete description will be given below with reference to the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of protection of the present invention.

The utility model discloses AOI based on DLP technique of preferred embodiment detects super bright low-cost light path structure, as shown in fig. 1, refers to fig. 2 simultaneously, including light source subassembly 1, even light path 2, DMD chip 3 and camera lens module 4; the light source assembly 1 comprises a laser light source 10 and a laser processing light path for processing emergent rays of the laser light source; the dodging light path 2 comprises an integrating column 20 for dodging emergent light of the laser processing light path and an imaging lens group 21; after the emergent light spot of the integrating column 20 passes through the imaging lens group 21, a conjugate light spot is formed at the DMD chip 3; emergent rays of the DMD chip 3 are imaged on the lens module 4, the lens module 4 is a Schlemm lens, and the angle between the plane where the effective surface of the DMD chip 3 is located, the perpendicular line of the Schlemm lens and the projection plane of the Schlemm lens meets the Schlemm's law;

a laser light source 10 is adopted, a light beam processed by a laser processing light path is emitted to an inlet of an integrating column 20, and is reflected for multiple times inside the integrating column 20, finally, a light spot with uniform brightness is formed at an outlet of the integrating column 20, and the light spot forms a rectangular light spot with uniform brightness on a DMD chip 3 through an imaging lens group, so that the overall size and cost are considered while the ultra-high brightness is ensured, a radiator can be made small and exquisite, a fan is not needed for radiating heat, and vibration is avoided; and DMD chip 3's inside comprises physical structures such as mechanical hinge and miniature aluminium mirror, and its life-span can not be influenced to the blue light, in addition, through introducing the sand camera lens for the light path of this application becomes the DLP light path structure that can use in the AOI field.

Preferably, the imaging lens group 21 is formed by combining a plurality of lenses, and according to actual needs, a reflecting mirror may not be provided, or a plurality of reflecting mirrors may be provided; such variations are intended to be within the scope of the present application.

Preferably, the optical lens module further comprises an RTIR prism group 5, wherein the RTIR prism group 5 is used for adjusting the angle of the outgoing light of the imaging lens group and reflecting the outgoing light of the DMD chip 5 to the lens module for imaging.

Preferably, the RTIR prism group 5 includes a main prism 50 in the shape of an isosceles right triangle, and an included angle θ exists between a right-angle surface of the main prism 50 and the effective surface of the DMD chip 3, and the included angle range is 1 to 5 degrees;

preferably, the RTIR prism group 5 includes a compensation prism 51 for adjusting the incident light angle of the main prism;

the primary prism 50 mainly uses the transmission and total internal reflection of the prism surface to spatially separate the illumination light path and the imaging light path, thereby improving the utilization efficiency of light energy.

The compensation prism 51 is used for compensating the symmetry of the optical path, so that the light spots at the DMD chip 3 have good uniformity; only the primary prism 50 may be provided, depending on design and cost requirements.

Preferably, the laser processing light path comprises a laser beam expanding light path 11 for compressing laser beams and a converging light path 12 for converging emergent light rays of the laser beam expanding light path into light spots;

preferably, the laser beam expanding optical path 11 is composed of a positive lens 110 and a negative lens 111; parallel light emitted by the laser light source 1 enters the positive lens 110 to be converged, and then is diverged into parallel light again after passing through the negative lens 111, so that the parallel light beam realizes a compression ratio of about 3:1, and the possibility of reducing the volume of a subsequent light path is provided;

preferably, the converging light path 12 is composed of two positive lenses; the two positive lenses converge the light beams from the laser beam expanding optical path into a light spot, and the light spot enters the inlet on the left side of the integrating column.

Preferably, the laser processing optical path further comprises a speckle elimination component 13; the speckle eliminating component 13 comprises a diffusion sheet 130 for destroying the original coherence of the laser beam and a motor 131 for driving the diffusion sheet to rotate;

when the laser diffuser works, the motor 131 continuously rotates to drive the diffuser 130 to rotate, and the original coherence of laser beams can be destroyed by the high-speed rotation of the diffuser 130, so that the dazzling speckle effect is eliminated;

it should be noted that the speckle reduction assembly 13 may be disposed at the light inlet of the integrating rod or at the light outlet of the integrating rod according to the space requirement.

It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.

Claims (7)

1. An AOI detection ultra-high brightness low-cost light path structure based on a DLP technology is characterized by comprising a light source component, a uniform light path, a DMD chip and a lens module; the light source component comprises a laser light source and a laser processing light path for processing emergent rays of the laser light source; the light homogenizing light path comprises an integrating column for homogenizing emergent light of the laser processing light path and an imaging lens group; after the emergent light spot of the integrating column passes through the imaging lens group, a conjugate light spot is formed at the DMD chip; emergent light rays of the DMD chip are imaged on the lens module, the lens module is a Schlemm lens, and the angle between the plane where the effective surface of the DMD chip is located, the perpendicular line of the Schlemm lens and the projection surface of the Schlemm lens meets the Schlemm's law.

2. The AOI detection ultra-high brightness low-cost optical path structure based on the DLP technology as claimed in claim 1, further comprising an RTIR prism group, wherein the RTIR prism group is used for adjusting the angle of the emergent ray of the imaging mirror group and reflecting the emergent ray of the DMD chip to the lens module for imaging.

3. The AOI detection ultra-high brightness low-cost optical path structure based on the DLP technology as claimed in claim 2, wherein the RTIR prism group comprises a main prism in an isosceles right triangle, a right angle surface of the main prism forms an included angle with the effective surface of the DMD chip, and the included angle is in a range of 1-5 degrees.

4. The DLP technology-based AOI detection ultra-high brightness low-cost optical path structure of claim 3, wherein the RTIR prism group comprises a compensation prism that adjusts the incident ray angle of the main prism.

5. The AOI detection ultra-high brightness low-cost optical path structure based on the DLP technology as claimed in any one of claims 1 to 4, wherein the laser processing optical path comprises a laser beam expanding optical path for compressing a laser beam and a converging optical path for converging emergent light rays of the laser beam expanding optical path into a light spot.

6. The AOI detection ultra-high brightness low-cost optical path structure based on DLP technology as claimed in claim 5, wherein the laser beam expanding optical path comprises a positive lens for converging the parallel light emitted by the laser source, and a negative lens for diverging the light into parallel light again after the light is converged by the positive lens.

7. The DLP technology-based AOI detection ultra-high brightness low cost optical path structure of claim 5, wherein the laser processing optical path further comprises a speckle cancellation component; the speckle eliminating component comprises a diffusion sheet for destroying the original coherence of the laser beam and a motor for driving the laser beam to rotate.

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