CN212411007U - High-brightness small-volume light path structure based on DLP technology and used in AOI detection field - Google Patents
High-brightness small-volume light path structure based on DLP technology and used in AOI detection field Download PDFInfo
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- CN212411007U CN212411007U CN202021498080.5U CN202021498080U CN212411007U CN 212411007 U CN212411007 U CN 212411007U CN 202021498080 U CN202021498080 U CN 202021498080U CN 212411007 U CN212411007 U CN 212411007U
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Abstract
The utility model relates to a high-brightness small-volume light path structure, an illumination light path, a dodging light path, a DMD chip and a lens module, which are used in the AOI detection field based on the DLP technology; the illumination light path comprises a first light-emitting source, a second light-emitting source, a third light-emitting source and a light combination component, wherein the first light-emitting source, the second light-emitting source and the third light-emitting source respectively correspond to the G, B, R light sources; the dodging light path comprises a compound eye and a lens component; emergent rays of the DMD chip are imaged on a lens module, and the lens module is a Schlemm lens; the plane where the effective surface of the DMD chip is located, the angle between the perpendicular line of the Samm lens and the projection surface of the Samm lens meet the Samm's law; the brightness is ensured, meanwhile, the wave bands can be freely switched, and the application range is improved; the DMD chip is adopted to replace the original LCOS chip, so that the brightness is improved, meanwhile, the electric power of the LED can be reduced, the radiator can be made small and exquisite, a fan is not needed for heat dissipation, 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
Technical Field
The utility model relates to a AOI detects technical field, and more specifically says, relates to a highlight small volume light path structure for AOI detection field 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. LCOS chips are polarizing devices. There is a necessary process of converting the natural light emitted from the LED into linearly polarized light, and the process loses about 50% of the brightness, resulting in insufficient brightness 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, liquid crystal molecules in the LCOS are easy to age under a blue light wave band, so that irreversible damage and reliability reduction are caused to the LCOS; LCOS projection has the problem of limited application range due to the unicity of the light source wave band.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to prior art's above-mentioned defect, a highlight small volume light path structure for AOI detection field based on DLP technique is provided.
The utility model provides a technical scheme that its technical problem adopted is:
constructing a high-brightness small-volume optical path structure based on a DLP technology and used in the AOI detection field, wherein the structure comprises an illumination optical path, a dodging optical path, a DMD chip and a lens module; the illumination light path comprises a first light-emitting source, a second light-emitting source and a third light-emitting source which respectively correspond to the G, B, R light sources, and a light combination component for combining the three light sources; the dodging light path comprises a compound eye and a lens assembly matched with the compound eye and is used for dodging emergent light rays of the illumination light path and emitting the dodged light rays to the DMD chip; the emergent light of the DMD chip is imaged on the lens module, and the lens module is a Schlemm lens; the angle between the plane where the effective surface of the DMD chip is located, the perpendicular line of the Samm lens and the projection surface of the Samm lens meets the Samm's law.
The utility model discloses a be used for AOI to detect the high bright small volume light path structure of field based on DLP technique, wherein, compound eye is two-sided symmetrical compound eye for divide into a plurality of beamlets with the incident wide light beam; the lens component is a condenser lens.
A highlight small volume light path structure for AOI detection area based on DLP technique, wherein, the lens subassembly comprises a plurality of lens combination, and is a plurality of be provided with the speculum that is used for folding light path between the lens.
A highlight small volume light path structure for AOI detection area based on DLP technique, wherein, still include RTIR prism group, RTIR prism group is used for adjusting the emergent ray angle of even light path, and will the emergent ray reflection of DMD chip extremely formation of image on the camera lens module.
The utility model discloses a be used for AOI detection field's highlight small volume light path structure based on DLP technique, wherein, RTIR prism group includes the main prism that is isosceles right triangle and the compensating prism that is right triangle; an included angle exists between a right-angle surface of the main prism and the effective surface of the DMD chip, and the included angle ranges from 1 degree to 5 degrees.
The utility model discloses a high-brightness small-volume light path structure for AOI detection field based on DLP technique, wherein, the illumination light path still includes the fourth light emitting source that corresponds the BP light source, the fourth light emitting source is blue light pumping light source; the light combination component emits light to combine the first light emitting source, the second light emitting source, the third light emitting source and the fourth light emitting source.
The utility model discloses a high bright small volume light path structure for AOI detection field based on DLP technique, wherein, the light combination subassembly includes four collimation lens group that corresponds respectively first light emitting source, the second light emitting source, the third light emitting source and the fourth light emitting source; the light combination component also comprises a light filter for reflecting the collimated light rays emitted by the fourth light emitting source to the effective light emitting surface of the first light emitting source, a first light combination sheet for combining the collimated light rays emitted by the second light emitting source and the collimated light rays emitted by the first light emitting source, and a second light combination sheet for combining the emergent light rays of the first light combination sheet and the collimated light rays emitted by the third light emitting source; the light filter and the first light combining plate are both provided with a plating layer which transmits green light and reflects blue light; and a coating which transmits blue light, green light and red light is arranged on the second light combining sheet.
The utility model discloses a be used for AOI detection area's highlight small volume light path structure based on DLP technique, wherein, be provided with the first relay lens to the emergent ray convergence of light filter between light filter and the first light combination piece; and a second relay lens for converging the emergent light of the first light combining sheet is arranged between the first light combining sheet and the second light combining sheet.
A highlight small size light path structure for AOI detection area based on DLP technique, wherein, the second light emitting source the third light emitting source with the emergent ray of fourth light emitting source all with the emergent ray of first light emitting source is perpendicular.
A highlight small volume light path structure for AOI detection area based on DLP technique, wherein, the camera lens module includes positive lens, cemented lens, diaphragm, negative lens and the positive focal power lens group that sets gradually along light outgoing direction.
The beneficial effects of the utility model reside in that: the method comprises the steps that a multicolor light source is adopted for light combination, a light beam after the light combination is shot on a compound eye, a wide light beam is divided into a plurality of thin light beams through the compound eye, then the light beams are condensed by a lens component matched with the compound eye, and then the light beams are emitted out to form a light spot with uniform brightness on a DMD chip, so that the wave band can be freely switched while the brightness is ensured, and the application range is improved; the DMD chip is adopted to replace the original LCOS chip, the former has about twice brightness as the latter because of no need of using polarized light, the electric power of the LED can be reduced while the brightness is improved, the radiator can be made small and exquisite, no fan is needed to dissipate heat, and the 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.
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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 schematic structural diagram of a high-brightness small-volume optical path for AOI detection based on DLP technology according to a preferred embodiment of the present invention;
fig. 2 is the utility model discloses preferred embodiment's dodging light path schematic diagram that is used for AOI detection area's highlight small volume light path structure based on DLP technique.
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 a DLP technique based highlight small volume light path structure for AOI detection field of preferred embodiment, as shown in fig. 1, refer to fig. 2 simultaneously, illumination light path 1, dodging light path 2, DMD chip 3 and camera lens module 4; the illumination light path 1 comprises a first light-emitting source 10, a second light-emitting source 11 and a third light-emitting source 12 which respectively correspond to G, B, R light sources, and a light combination component for combining the three light sources; the dodging light path 2 comprises a compound eye 20 and a lens assembly 21 matched with the compound eye 20, and is used for dodging emergent light rays of the illumination light path 1 and emitting the dodged light rays to the DMD chip 3; emergent rays of the DMD chip 3 are imaged on the lens module 4, and the lens module 4 is a Schlemm lens; the angle between the plane where the effective surface of the DMD chip 3 is located, the perpendicular line of the Samm lens and the projection surface of the Samm lens meets the Samm's law;
the method comprises the steps that a multicolor light source is adopted for light combination, a light beam after the light combination is shot on a compound eye, a wide light beam is divided into a plurality of thin light beams through the compound eye, then the light beams are condensed by a lens component matched with the compound eye, and then the light beams are emitted out to form a light spot with uniform brightness on a DMD chip, so that the wave band can be freely switched while the brightness is ensured, and the application range is improved; the DMD chip is adopted to replace the original LCOS chip, the former has about twice brightness as the latter because of no need of using polarized light, the electric power of the LED can be reduced while the brightness is improved, the radiator can be made small and exquisite, no fan is needed to dissipate heat, and the 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.
Preferably, the compound eye 20 is a double-sided symmetrical compound eye for dividing an incident wide light beam into a plurality of beamlets; the lens assembly 21 is a condenser lens; the working principle is shown in fig. 2, LA1 and LA2 are the entrance surface and the exit surface of the fly eye respectively, the parameters of the entrance surface and the exit surface are completely symmetrical, L is a positive lens, and the function of the positive lens is equivalent to that of the lens assembly 21. The parallel light beams are vertically projected on the convex surface of the fly-eye lens LA1 and focused on the center of the convex surface of LA2, and then pass through the condenser lens L, so that a uniform light spot can be obtained on the focal plane of L. The kohler illumination system is a special kohler illumination system and adopts the principle that an incident wide light beam is divided into a plurality of thin light beams by a front row fly eye lens LA, so that light spots obtained on an illumination screen are superposed after each thin light beam obtains an independent light spot through an optical system, and all positions in the light spots can be irradiated by each thin light beam. In addition, due to the subdivision of the incident light beam by the fly-eye lens, the uniformity of the light energy distribution inside each beamlet will be better than that of the originally incident broad beam. The plurality of lenses constituting the lens assembly may have mirrors disposed therebetween to fold the optical path according to system space considerations.
Preferably, the optical lens module further comprises an RTIR prism group 5, and the RTIR prism group 5 is used for adjusting the angle of the emergent light of the dodging optical path and reflecting the emergent light of the DMD chip 3 to the lens module 4 for imaging.
Preferably, the RTIR prism group 5 includes a main prism 50 in the shape of an isosceles right triangle and a compensation prism 51 in the shape of a right triangle; an included angle exists between a right-angle surface of the main prism 50 and an effective surface of the DMD chip 3, and the included angle ranges from 1 degree to 5 degrees;
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 illumination light path further includes a fourth light-emitting source 13 corresponding to the BP light source, and the fourth light-emitting source 13 is a blue light pump light source; the light combining component emits light to combine the first light emitting source 10, the second light emitting source 11, the third light emitting source 12 and the fourth light emitting source 13.
Preferably, the light combining component includes four collimating lens groups 14 respectively corresponding to the first light emitting source 10, the second light emitting source 11, the third light emitting source 12 and the fourth light emitting source 13; the light combining component further includes a light filter 15 for reflecting the collimated light emitted by the fourth light source 13 to the effective light emitting surface of the first light source 10, a first light combining sheet 16 for combining the collimated light emitted by the second light source 11 and the collimated light emitted by the first light source 10, and a second light combining sheet 17 for combining the emergent light of the first light combining sheet 16 and the collimated light emitted by the third light source 12; the light filter 15 and the first light combining sheet 16 are both provided with a plating layer which transmits green light and reflects blue light; a coating which transmits blue light, green light and red light is arranged on the second light combining sheet 17;
the pump light emitted by the fourth light emitting source 13 is collimated by the collimating lens group 14, then passes through the collimating lens group 14 at the first light emitting source 10 under the reflection action of the optical filter 15, and is converged on the effective light emitting surface of the first light emitting source 10 to excite more green light, and the excited green light and the green light emitted by the first light emitting source 10 are collimated by the collimating lens group 14 and then transmitted out through the optical filter 15; after the light emitted by the second light emitting source 11 is collimated by the collimating lens group 14, the light is combined with the green light from the left side by the reflection of the first light combining sheet 16; after the light emitted by the third light source 12 is collimated by the collimating lens group 14, the light is combined with the blue light and the green light from the left side by the reflection of the second light combining sheet 17, and finally the red, green and blue 3 paths of collimated light are combined, so that the problems of single wavelength and low brightness of the light source are solved.
Preferably, a first relay lens 18 for converging the emergent light of the optical filter is arranged between the optical filter 15 and the first light combining sheet 16; a second relay lens 19 which converges the emergent light of the first light combining sheet is arranged between the first light combining sheet 16 and the second light combining sheet 17; the primary function of the first relay lens 18 and the second relay lens 19 is to converge the light, so that the collimated light of the first light emitting source and the fourth light emitting source with longer light propagation distance has substantially the same light spot size when the light enters and is combined.
Preferably, the emergent light of the second light-emitting source 11, the third light-emitting source 12 and the fourth light-emitting source 13 is perpendicular to the emergent light of the first light-emitting source 10; structural configuration is reasonable, the convenient setting.
Preferably, the lens module 4 includes a positive lens 40, a cemented lens 41, a diaphragm 42, a negative lens 43, and a positive light angle lens 44, which are sequentially arranged along the light exit direction; the positive lens 40 mainly bears the focal power of the rear group, the cemented lens 41 is located near the diaphragm 42 and mainly functions to correct chromatic aberration, and the number of the cemented lenses 41 can be 1 or 2, or a double cemented lens or a triple cemented lens according to the correction condition of actual aberration; the negative lens 43 and the positive power lens group 44 constitute a front group of the imaging optical path.
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 (10)
1. A DLP technology-based high-brightness small-volume light path structure used in the AOI detection field is characterized by comprising an illumination light path, a dodging light path, a DMD chip and a lens module; the illumination light path comprises a first light-emitting source, a second light-emitting source and a third light-emitting source which respectively correspond to the G, B, R light sources, and a light combination component for combining the three light sources; the dodging light path comprises a compound eye and a lens assembly matched with the compound eye and is used for dodging emergent light rays of the illumination light path and emitting the dodged light rays to the DMD chip; the emergent light of the DMD chip is imaged on the lens module, and the lens module is a Schlemm lens; the angle between the plane where the effective surface of the DMD chip is located, the perpendicular line of the Samm lens and the projection surface of the Samm lens meets the Samm's law.
2. The DLP technology-based high-brightness small-volume optical path structure for the AOI detection field according to claim 1, wherein the compound eye is a double-sided symmetrical compound eye for dividing an incident wide beam into a plurality of beamlets; the lens component is a condenser lens.
3. The DLP technology-based high-brightness small-volume optical path structure for the AOI detection field according to claim 2, wherein the lens assembly is composed of a plurality of lenses, and a reflecting mirror for folding the optical path is arranged between the plurality of lenses.
4. The DLP technology-based high-brightness small-volume optical path structure used in the AOI detection field according to claim 1, further comprising an RTIR prism group, wherein the RTIR prism group is used for adjusting the outgoing ray angle of the dodging optical path and reflecting the outgoing ray of the DMD chip onto the lens module for imaging.
5. The DLP technology-based high-brightness small-volume optical path structure for the AOI detection field according to claim 4, wherein the RTIR prism group comprises a main prism in an isosceles right triangle shape and a compensation prism in a right triangle shape; an included angle exists between a right-angle surface of the main prism and the effective surface of the DMD chip, and the included angle ranges from 1 degree to 5 degrees.
6. The DLP technology-based high-brightness small-volume optical path structure for the AOI detection field according to any one of claims 1 to 5, wherein the illumination optical path further comprises a fourth light emitting source corresponding to a BP light source, and the fourth light emitting source is a blue light pumping light source; the light combination component emits light to combine the first light emitting source, the second light emitting source, the third light emitting source and the fourth light emitting source.
7. The DLP technology-based high-brightness small-volume optical path structure for the AOI detection field according to claim 6, wherein the light combining component comprises four collimating lens groups respectively corresponding to the first light emitting source, the second light emitting source, the third light emitting source and the fourth light emitting source; the light combination component also comprises a light filter for reflecting the collimated light rays emitted by the fourth light emitting source to the effective light emitting surface of the first light emitting source, a first light combination sheet for combining the collimated light rays emitted by the second light emitting source and the collimated light rays emitted by the first light emitting source, and a second light combination sheet for combining the emergent light rays of the first light combination sheet and the collimated light rays emitted by the third light emitting source; the light filter and the first light combining plate are both provided with a plating layer which transmits green light and reflects blue light; and a coating which transmits blue light, green light and red light is arranged on the second light combining sheet.
8. The DLP technology-based high-brightness small-volume optical path structure for the AOI detection field according to claim 7, wherein a first relay lens for converging the emergent light of the optical filter is arranged between the optical filter and the first light combining sheet; and a second relay lens for converging the emergent light of the first light combining sheet is arranged between the first light combining sheet and the second light combining sheet.
9. The DLP technology-based high-brightness small-volume optical path structure for AOI detection field according to claim 7, wherein the emergent rays of the second light emitting source, the third light emitting source and the fourth light emitting source are all perpendicular to the emergent ray of the first light emitting source.
10. The DLP technology-based high-brightness small-volume optical path structure for the AOI detection field according to any one of claims 1 to 5 and 7 to 9, wherein the lens module comprises a positive lens, a cemented lens, a diaphragm, a negative lens and a positive power lens group which are arranged in sequence along the light ray emergence direction.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115016214A (en) * | 2022-07-14 | 2022-09-06 | 北京一数科技有限公司 | Projector with a light source |
| CN115113461A (en) * | 2022-07-21 | 2022-09-27 | 江苏达伦电子股份有限公司 | High-brightness projection optical machine with inclination angle projection defocusing compensation function and projection ceiling lamp |
| CN115016214B (en) * | 2022-07-14 | 2024-04-26 | 北京一数科技有限公司 | Projector with a light source for projecting light |
-
2020
- 2020-07-24 CN CN202021498080.5U patent/CN212411007U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115016214A (en) * | 2022-07-14 | 2022-09-06 | 北京一数科技有限公司 | Projector with a light source |
| CN115016214B (en) * | 2022-07-14 | 2024-04-26 | 北京一数科技有限公司 | Projector with a light source for projecting light |
| CN115113461A (en) * | 2022-07-21 | 2022-09-27 | 江苏达伦电子股份有限公司 | High-brightness projection optical machine with inclination angle projection defocusing compensation function and projection ceiling lamp |
| CN115113461B (en) * | 2022-07-21 | 2023-08-18 | 江苏达伦电子股份有限公司 | High-brightness projection light machine with inclination angle projection defocusing compensation function and projection ceiling lamp |
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