CN111562715A - Composite collimating device and system for micro projection - Google Patents
Composite collimating device and system for micro projection Download PDFInfo
- Publication number
- CN111562715A CN111562715A CN202010449605.4A CN202010449605A CN111562715A CN 111562715 A CN111562715 A CN 111562715A CN 202010449605 A CN202010449605 A CN 202010449605A CN 111562715 A CN111562715 A CN 111562715A
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- Prior art keywords
- lens
- collimating
- spherical
- graded index
- compound
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/30—Collimators
Abstract
The application discloses a compound collimating device for miniature projection relates to projection technical field, includes: a spherical collimating lens and a graded index lens; the spherical collimating lens and the graded index lens are rotationally symmetrical along the center of a main optical axis of the composite collimating device; the spherical collimating lens is used for pre-collimating a first light field output by the LED light source; and the graded index lens is used for adjusting the second light field output by the spherical collimating lens so as to balance the high-order aberration light rays in the second light field. The collimation effect is good; the graded index lens is easy to form surface bearing with a corresponding structural part, so that the tolerance accumulation near the graded index lens can be greatly reduced, the tolerance redundancy is increased, and the manufacturing is convenient; the use quantity of the whole lenses can be saved, the use of the aspheric lenses is avoided, the manufacturing cost is reduced, and the whole size of the constraint can be better. A compound collimation system for miniature projection is also provided.
Description
Technical Field
The application relates to the technical field of projection, in particular to a composite collimating device and a composite collimating system for micro projection.
Background
With the maturity of the projection technology level, projection devices are used in more and more fields, such as home video, advertisement projection, industrial projection detection, and the like. Wherein the demand for small-sized, high-brightness, high-resolution projection devices is also increasing. The manufacture of the projection optical-mechanical lens with smaller size, better imaging quality and lower cost is the target of various manufacturers of large projection equipment.
The micro projector comprises a bottom layer made of technologies in the crossing field of optical, mechanical and electrical engineering and the like; the final imaging effect of the projection is closely related to the illumination system of the micro projector besides the imaging lens. The miniature projection lighting system determines the upper limit of the energy utilization rate of the projection system after projection, and the source of the determination of the efficiency of the lighting system lies in the collimation system of the light source of the system.
The light source collimation system (Collimating system) has two main streams in micro projection: 1. the light source is collimated by the combination of the glass lenses; 2. the lens closest to the light source is a glass lens, and an aspheric lens made of plastic or glass is reused. If a combination of several glass lenses is used, the size of the system is greatly restricted, and the superposition of multiple glass lenses enlarges the assembly tolerance of the system. If a glass lens is adopted and an aspheric lens made of plastic materials or glass materials is reused, the combination is beneficial to volume compression of the light source collimation system, but the manufacturing cost of the glass aspheric lens and the heating stability of the plastic materials are the problems that the light source collimation system is difficult to avoid in the using process and the collimation effect is influenced.
Disclosure of Invention
In view of the above, a first object of the present application is to provide a compound collimator for micro projection, which has good collimating effect, low cost, large tolerance redundancy, and easy manufacturing.
It is a second object of the present application to provide a compound collimation system for miniature projection.
To achieve the above technical object, the present application provides a compound collimating device for micro projection, comprising: a spherical collimating lens and a graded index lens;
the spherical collimating lens and the graded index lens are rotationally symmetrical along the center of a main optical axis of the composite collimating device;
the spherical collimating lens is used for pre-collimating a first light field output by the LED light source;
and the graded index lens is used for adjusting the second light field output by the spherical collimating lens so as to balance the high-order aberration light rays in the second light field.
Further, the center distance value between the spherical collimating lens and the graded index lens is smaller than or equal to the focal length value of the spherical collimating lens.
Further, the number of the spherical collimating lenses is multiple.
Further, the number of the spherical collimating lenses is specifically 2-3.
Further, the graded index lens is plural in number.
The composite collimation system for the micro projection comprises an LED light source, a light source protection cover plate and a composite collimation device;
the composite collimating device is arranged on an emitting light path of the LED light source output by the light source protection cover plate;
the spherical collimating lens is used for pre-collimating the first light field output by the light source protective cover;
and the graded index lens is used for adjusting the second light field output by the spherical collimating lens so as to balance the high-order aberration light rays in the second light field.
Further, the center distance value between the spherical collimating lens and the graded index lens is smaller than or equal to the focal length value of the spherical collimating lens.
Further, the number of the spherical collimating lenses is multiple.
Further, the number of the spherical collimating lenses is specifically 2-3.
Further, the graded index lens is specifically a cylindrical lens.
According to the technical scheme, the composite collimating device provided by the application realizes collimation by compounding the spherical collimating lens with the graded index lens; the spherical collimating lens is utilized to process most of Lambertian distributed first light fields from the LED light source, and large-angle light rays in the first light fields are collected to realize pre-collimation treatment; and then, the high-order aberration in the second light field output after the spherical lens treatment is processed through the graded index lens, so that the re-collimation treatment is realized. Such a collimation mode has the following beneficial effects: 1, the utilization rate of the light energy of the LED can be improved as much as possible, the divergence angle of the final output light beam is ensured, and the collimation effect is good; 2, the graded index lens is easy to form a surface bearing with a corresponding structural part, so that the tolerance accumulation near the graded index lens can be greatly reduced, the tolerance redundancy is increased, and the manufacturing is convenient; 3, the using quantity of the whole lenses can be saved, the use of aspheric lenses is avoided, the manufacturing cost is reduced, and the whole size can be restrained well.
According to the technical scheme, the composite collimation system has the same beneficial effects.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic diagram of a composite collimating apparatus for micro-projection provided in the present application;
FIG. 2 is a schematic diagram of a composite collimation system for micro-projection provided herein;
FIG. 3 is a schematic diagram illustrating an application state of a compound collimation system for micro-projection provided in the present application;
FIG. 4 is a diagram illustrating an application state of a collimating system of a conventional spherical mirror combined with an aspherical mirror;
FIG. 5 is a diagram illustrating an application state of a conventional collimating system with a plurality of spherical mirrors;
in the figure: 1. a spherical collimating lens; 2. a graded index lens; 3. an LED light source; 4. the light source protects the cover plate.
Detailed Description
The technical solutions of the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the embodiments in the present application.
In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are used broadly and are defined as, for example, a fixed connection, an exchangeable connection, an integrated connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements, unless otherwise explicitly stated or limited. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.
The embodiment of the application discloses a composite collimating device for micro projection.
Referring to fig. 1, an embodiment of a compound collimating device for micro-projection provided in the embodiment of the present application includes:
a spherical collimating lens 1 and a graded index lens 2; the spherical collimating lens 1 and the graded index lens 2 are rotationally symmetrical along the center of a main optical axis of the composite collimating device; the spherical collimating lens 1 is used for pre-collimating a first light field output by the LED light source 3; and the graded-index lens 2 is used for adjusting the second light field output by the spherical collimating lens 1 so as to balance the high-order aberration light rays in the second light field.
According to the technical scheme, the composite collimating device provided by the application realizes collimation by compounding the spherical collimating lens 1 with the graded index lens 2; most of first light fields with Lambertian distribution from the LED light source 3 can be processed by the spherical collimating lens 1, and large-angle light rays in the first light fields are collected to realize pre-collimation processing; and then the high-order aberration light rays in the second light field output after being processed by the spherical lens are processed by the graded index lens 2, so that the re-collimation processing is realized. Such a collimation mode has the following beneficial effects: 1, the utilization rate of the light energy of the LED can be improved as much as possible, the divergence angle of the final output light beam is ensured, and the collimation effect is good; 2, the graded index lens 2 is mechanically enveloped into a cylindrical surface, so that the graded index lens is easy to form a surface bearing with a corresponding structural part, the tolerance accumulation near the graded index lens 2 can be greatly reduced, the tolerance redundancy is increased, and the manufacturing is convenient; 3, the using quantity of the whole lenses can be saved, the use of aspheric lenses is avoided, the manufacturing cost is reduced, and the whole size can be restrained well.
The above is a first embodiment of a composite collimating device and system for micro-projection provided in the embodiments of the present application, and the following is a second embodiment of a composite collimating device and system for micro-projection provided in the embodiments of the present application, please refer to fig. 1 specifically.
A compound collimation device for miniature projection, comprising: a spherical collimating lens 1 and a graded index lens 2; the spherical collimating lens 1 and the graded index lens 2 are rotationally symmetrical along the center of a main optical axis of the composite collimating device; the spherical collimating lens 1 is used for pre-collimating a first light field output by the LED light source 3; and the graded-index lens 2 is used for adjusting the second light field output by the spherical collimating lens 1 so as to balance the high-order aberration light rays in the second light field.
Further, the center distance between the adjacent spherical collimating lens 1 and the graded-index lens 2 has a certain influence on the final collimating effect, and the larger the center distance between the spherical collimating lens 1 and the graded-index lens 2 is, the larger the aperture requirement of the graded-index head lens is, and the poorer the final collimating effect is. For this reason, in order to ensure the final collimating effect, the center-to-center distance between the spherical collimating lens 1 and the graded-index lens 2 in the present embodiment is preferably smaller than or equal to the focal length of the spherical collimating lens 1.
In the present application, the number of the spherical collimating lenses 1 and the number of the graded index lenses 2 may be plural. In the case where the number of the spherical collimating lenses 1 is plural, 2 to 3 spherical collimating lenses 1 may be preferable in the case where the number is plural for the purpose of controlling the manufacturing cost and controlling the overall size. The setting distance between the spherical collimating lenses 1 is not too large, and the spherical collimating lenses can be properly adjusted according to actual needs without specific limitations. In the case that there are a plurality of graded index lenses 2, for the purpose of controlling the manufacturing cost and controlling the overall size, the number of graded index lenses 2 also needs to be limited according to the actual requirement, wherein the distance between the graded indexes should not be too large, and preferably can be strictly supported by each other, so as to better ensure the final collimation effect. In the above, the number and the pitch of the spherical collimating lens 1 and the graded index lens 2 can be appropriately changed by those skilled in the art based on the above, and the invention is not limited in particular. In specific application, the spherical collimating lens 1 can be combined with the graded index lens 2, so that the collimating effect is met, and the manufacturing cost is saved as much as possible.
The embodiment of the application also discloses a composite collimation system for micro projection.
Referring to fig. 2, the LED light source module includes an LED light source 3, a light source protection cover plate 4 and a composite collimating device; the composite collimating device is arranged on an emitting light path output by the LED light source 3 through the light source protection cover plate 4; the spherical collimating lens 1 is used for pre-collimating the first light field output by the light source protective cover; and the graded-index lens 2 is used for adjusting the second light field output by the spherical collimating lens 1 so as to balance the high-order aberration light rays in the second light field. Referring to fig. 3, it can be known from a comparison between fig. 4 and fig. 5 that the final collimation effect of the LED light source 3 is better than the collimation effect of the combination of the conventional spherical mirror and the aspherical mirror and the collimation effect of the combination of the conventional spherical mirror-1/spherical mirror-2/spherical mirror-3 and other spherical mirrors.
While the composite collimating device and system for micro-projection provided by the present application have been described in detail, those skilled in the art will appreciate that the various modifications, additions, substitutions, and substitutions are possible, and that the present application is not limited by the scope of the present application.
Claims (10)
1. A compound collimation device for miniature projection, comprising: a spherical collimating lens and a graded index lens;
the spherical collimating lens and the graded index lens are rotationally symmetrical along the center of a main optical axis of the composite collimating device;
the spherical collimating lens is used for pre-collimating a first light field output by the LED light source;
and the graded index lens is used for adjusting the second light field output by the spherical collimating lens so as to balance the high-order aberration light rays in the second light field.
2. A compound collimating device for miniature projection according to claim 1, wherein the center distance between said spherical collimating lens and said graded index lens is smaller than or equal to the focal length of said spherical collimating lens.
3. A compound collimating device for miniature projection as claimed in claim 1, wherein said spherical collimating lens is plural in number.
4. A compound collimating device for miniature projection as claimed in claim 3, characterized in that said spherical collimating lenses are in particular 2-3 in number.
5. A compound collimation device for miniature projections as claimed in claim 1, wherein said graded index lens is plural in number.
6. A compound collimation system for micro projection, comprising an LED light source, a light source protection cover plate, and a compound collimation device as claimed in claim 1;
the composite collimating device is arranged on an emitting light path of the LED light source output by the light source protection cover plate;
the spherical collimating lens is used for pre-collimating the first light field output by the light source protective cover;
and the graded index lens is used for adjusting the second light field output by the spherical collimating lens so as to balance the high-order aberration light rays in the second light field.
7. A compound collimation system for miniature projections as claimed in claim 6, wherein the value of the center-to-center distance between said spherical collimation lens and said GRIN lens is less than or equal to the value of the focal length of said spherical collimation lens.
8. A compound collimation system for miniature projections as claimed in claim 6 wherein said spherical collimating lens is plural in number.
9. A compound collimating system for miniature projections according to claim 8, characterized in that the number of spherical collimating lenses is in particular 2-3.
10. A compound collimation system for miniature projections as claimed in claim 6, characterized in that said graded index lens is in particular a cylindrical lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010449605.4A CN111562715A (en) | 2020-05-25 | 2020-05-25 | Composite collimating device and system for micro projection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010449605.4A CN111562715A (en) | 2020-05-25 | 2020-05-25 | Composite collimating device and system for micro projection |
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| CN111562715A true CN111562715A (en) | 2020-08-21 |
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| CN202010449605.4A Pending CN111562715A (en) | 2020-05-25 | 2020-05-25 | Composite collimating device and system for micro projection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113867090A (en) * | 2021-09-30 | 2021-12-31 | 深圳市火乐科技发展有限公司 | Projection equipment and light source device thereof |
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