CN111856853A - Micro-lens array projection system of composite micro-prism - Google Patents
Micro-lens array projection system of composite micro-prism Download PDFInfo
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- CN111856853A CN111856853A CN202010824884.8A CN202010824884A CN111856853A CN 111856853 A CN111856853 A CN 111856853A CN 202010824884 A CN202010824884 A CN 202010824884A CN 111856853 A CN111856853 A CN 111856853A
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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
- G03B21/142—Adjusting of projection optics
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
- G02B5/045—Prism arrays
Abstract
The invention provides a micro-lens array projection system of a composite micro-prism, which comprises a light source, a composite collimating mirror module, a projection source, a composite projection mirror module and a receiving surface which are sequentially arranged, wherein the composite collimating mirror module comprises a collimation and light-gathering surface and a first micro-lens array surface, the first micro-lens array surface comprises m first micro-lens units, and the projection source comprises m projection image units; the composite projection mirror module comprises a microprism array surface and a second microlens array surface, the microprism array surface is positioned on one side of the second microlens array surface close to the projection source, the microprism array surface comprises m wedge-shaped microprism units, and the second microlens array surface comprises m second microlens units; the wedge angle of the ith wedge-shaped microprism unit from the optical axis of the system satisfies the following relation:
the wedge-shaped microprism unit can realize targeted deflection on the object image unit, and finally, a clear and single projection real image is formed.
Description
Technical Field
The invention relates to a projection system, and particularly discloses a micro-lens array projection system of a composite micro-prism.
Background
The projection system is an optical system that images an object illuminated on a projection screen. The short-distance projection system can be applied to the side face of an automobile for welcoming, can also be applied to the front and the rear of the automobile for warning and reminding, and can also be applied to desktop projection, such as projection of keyboard images.
Projection systems mainly comprise three important components: a light source, a projection source, and an imaging unit. The projection system is divided into a single-channel projection system and a multi-channel projection system according to whether images in a projection source repeatedly appear on a receiving surface.
The single-channel projection system is provided with a multi-sheet imaging unit as shown in fig. 1, and comprises a projection source such as an LED, a collimating lens, a film and the like and a projection unit lens group, so that a high-definition projection real image can be obtained at different distances, but the depth of field is shallow, the number of lenses is large, and the total length of the system is large.
As shown in fig. 2, the multi-channel projection system includes a light source, a collimating lens, a first microlens array, a projection source, and a second microlens array, and can achieve far-field imaging, but when the receiving surface distance is relatively short, the height of the microlens unit is relatively large compared with the image height of the projection real image, and cannot be ignored, and if the ratio of the height of the microlens unit to the height of the projection real image is greater than 1/50, due to the deviation of each imaging optical path, a plurality of image planes on the image plane are superimposed on each other, so that a clear and single projection real image cannot be formed finally.
The projection system in the prior art cannot simultaneously achieve the performances of short-distance projection, clear and single projection real image and small total length of the system.
Disclosure of Invention
Therefore, it is necessary to provide a microlens array projection system with a composite microprism, which can achieve a clear single projection effect at a short distance and has a small total length.
In order to solve the prior art problem, the invention discloses a micro-lens array projection system of a composite micro-prism, which comprises a light source, a composite collimating mirror module, a projection source, a composite projection mirror module and a receiving surface which are sequentially arranged, wherein the composite collimating mirror module comprises a collimation light-gathering surface and a first micro-lens array surface, the collimation light-gathering surface is positioned on one side of the first micro-lens array surface, which is far away from the projection source, the first micro-lens array surface comprises m first micro-lens units which are arranged in an array manner, and the projection source comprises m projection image units which are arranged in an array manner;
the composite projection mirror module comprises a microprism array surface and a second micro-lens array surface, the microprism array surface is positioned on one side of the second micro-lens array surface close to a projection source, the microprism array surface comprises m wedge-shaped microprism units arranged in an array, the second micro-lens array surface comprises m second micro-lens units arranged in an array, each wedge-shaped microprism unit has a common central shaft with the first micro-lens unit and the second micro-lens unit corresponding to two sides, and each projection image unit is positioned on the central shaft of each wedge-shaped microprism unit;
the distance between the first microlens array surface and the second microlens array surface is s, the distance between the microprism array surface and the receiving surface is L', and the focal length f of the first microlens unit is1S, the focal length of the second microlens unit being f2＝(L′*s)/(L′+s)；
The wedge angle of the wedge-shaped microprism unit is alphaiAnd i x d is less than L', and the wedge angle of the ith wedge-shaped micro prism unit from the optical axis of the system satisfies the following relational expression:
and the distance between two adjacent first micro lens units, the distance between two adjacent second micro lens units and the distance between two adjacent wedge-shaped micro prism units are d, and n is a refractive index.
Furthermore, the collimation light-gathering surface is arranged on the collimation lens, and the first micro-lens array surface is arranged on the first multi-channel lens.
Furthermore, the first micro-lens array surface is positioned on one side of the first multi-channel lens far away from the projection source, one side of the first multi-channel lens close to the projection source is a plane, and the projection source is in close contact with the plane of the first multi-channel lens.
Further, the projection source comprises at least two projection image units having different projection images.
Furthermore, the microprism array surface is arranged on the deflection lens, and the second microlens array surface is arranged on the second multi-channel lens.
Furthermore, both side surfaces of the deflection lens are provided with microprism array surfaces.
Furthermore, one side of the deflection lens close to the projection source is a microprism array surface, and one side of the deflection lens far away from the projection source is a plane; one side of the second multi-channel lens, which is close to the receiving surface, is a second micro-lens array surface, one side of the second multi-channel lens, which is far away from the receiving surface, is a plane, and the plane of the deflection lens is in close contact with the plane of the second multi-channel lens.
Furthermore, the microprism array surface and the second microlens array surface are both arranged on the projection composite lens.
The invention has the beneficial effects that: the invention discloses a micro-lens array projection system of a composite micro-prism, which is provided with a first micro-lens array surface and a second micro-lens array surface, wherein a first micro-lens unit and a second micro-lens unit which are opposite have a common optical axis, so that optical information crosstalk between adjacent optical channels can be effectively avoided, the micro-prism array surface is arranged between a projection source and the second micro-lens array surface, the pointed deflection can be realized on a sub-object image unit of the second micro-lens unit through a wedge-shaped micro-prism unit, the deflected sub-object image unit forms a sub-real image unit through the second micro-lens unit, and finally, each sub-real image unit is compounded and overlapped on a receiving surface to form a clear and single projection real image, the total length of the system is small, and the structure is simple.
Drawings
Fig. 1 is a schematic diagram of an optical path structure of a single-channel projection system in the prior art.
Fig. 2 is a schematic diagram of an optical path structure of a multi-channel projection system in the prior art.
Fig. 3 is a schematic diagram of the optical path structure of the present invention.
Fig. 4 is a partial structural schematic diagram of the present invention.
Fig. 5 is a schematic diagram of an optical path structure according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of an optical path structure according to another embodiment of the present invention.
Fig. 7 is a schematic diagram of an optical path structure according to another embodiment of the present invention.
The reference signs are: the projection system comprises a light source 10, a composite collimating mirror module 20, a collimating and condensing surface 21, a collimating lens 21A, a second micro-lens array surface 22, a second micro-lens unit 221, a first multi-channel lens 22A, a projection source 30, a projection image unit 31, a composite projection mirror module 40, a micro-prism array surface 41, a wedge-shaped micro-prism unit 411, a deflection lens 41A, a second micro-lens array surface 42, a second micro-lens unit 421, a second multi-channel lens 42A, a projection composite lens 43 and a receiving surface 50.
Detailed Description
For further understanding of the features and technical means of the present invention, as well as the specific objects and functions attained by the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.
Refer to fig. 3 to 7.
The basic embodiment of the invention discloses a micro-lens array projection system of a composite micro-prism, as shown in fig. 3, which comprises a light source 10, a composite collimating mirror module 20, a projection source 30, a composite projecting mirror module 40 and a receiving surface 50, which are sequentially arranged, preferably, the light source 10 can be an LED lamp bead, the composite collimating mirror module 20 comprises a collimation light-collecting surface 21 and a first micro-lens array surface 22, preferably, the collimation light-collecting surface 21 is an aspheric surface with positive focal power, the collimation light-collecting surface 21 is positioned on one side of the first micro-lens array surface 22 far away from the projection source 30, the first micro-lens array surface 22 comprises m first micro-lens units 221 arranged in an array, the projection source 30 comprises m projection image units 31 arranged in an array, the projection source 30 can be a film, a liquid crystal screen and the like, and the receiving surface 50 can be a wall surface, a ground surface, a white screen and the like;
the composite projection mirror module 40 comprises a micro-prism array surface 41 and a second micro-lens array surface 42, the micro-prism array surface 41 is positioned on one side of the second micro-lens array surface 42 close to the projection source 30, the micro-prism array surface 41 comprises m wedge-shaped micro-prism units 411 arranged in an array, the second micro-lens array surface 42 comprises m second micro-lens units 421 arranged in an array, the cross section of each wedge-shaped micro-prism unit 411 is a right triangle, each first micro-lens unit 221, each micro-prism unit and each second micro-lens unit 421 on the same horizontal position correspond to each other one by one, each wedge-shaped micro-prism unit 411 has a common central axis with the first micro-lens unit 221 and the second micro-lens unit 421 corresponding to two sides, so that the phenomenon that the final projected real image is formed as a double image due to crosstalk of optical information between adjacent optical channels can be effectively avoided, each projection image unit 31 is positioned on the central axis of each wedge-shaped micro-, the opposing first and second microlens units 221 and 421 and the wedge-shaped microprism unit 411 form light channels in which the respective projection image units 31 are respectively located;
as shown in fig. 4, the distance between the first microlens array surface 22 and the second microlens array surface 42 is s, the distance between the microprism array surface 41 and the receiving surface 50 is L ', and L' is a projection distance, in order to ensure that the light collimated by the collimating and condensing surface 21 can accurately reach the light channel corresponding to the second microlens unit 421 and no crosstalk occurs, the first microlens unit 221 is used as a field lens, the focal point of the first microlens unit 221 is arranged at the main point corresponding to the second microlens unit 421, and the focal length f of the first microlens unit 221 is1The focal length of the second microlens unit 421 is f2＝(L′*s)/(L′+s)；
As shown in fig. 4, the parallel line of the optical axis of the whole system passes through the inclined plane of each wedge-shaped micro-prism unit 411, the plane formed by the optical axis of any micro-lens unit and the optical axis of the system is perpendicular to the inclined plane of the wedge-shaped micro-prism unit 411 corresponding to the micro-lens unit, and the wedge angle of the wedge-shaped micro-prism unit 411 is αiIn fig. 4, the included angle between two inclined planes of two wedge-shaped micro-prism units 411 having the same central axis is a wedge angle, the distance between the centers of two adjacent first micro-lens units 221, the distance between the centers of two adjacent second micro-lens units 421, and the distance between the centers of two adjacent wedge-shaped micro-prism units 411 are d, n is the refractive index of the lens where the micro-prism array surface 41 is located, when the first micro-lens unit is a lensThe relative projection distance of the position of the cell 221 or the second microlens cell 421 from the optical axis of the system is small enough, i.e. I x d < L', when the incident angle I of the light is small enoughiIs small, when the incident angle of the light at the wedge-shaped microprism unit 411 is also small, and thus the wedge angle αiAnd is also small, so the sine value of the angle can be approximated as the angular arc, and the simplified declination formula is as follows:i＝(n-1)*αiaccording to the geometric relationship in the figure, the deflection angle can be knowni(i x d)/L', the wedge angle of the wedge-shaped microprism unit 411 is αiI x d < L', and combining the above two equations, the wedge angle of the ith wedge-shaped microprism unit 411 from the optical axis of the system satisfies the following relation:
wherein i is an integer of 0 to m, i is 0 at the center, and the unit of the angle is radian.
The numerical value obtained by the calculation of the relational expression is a design reference value, and can be adjusted according to actual conditions in specific application to adapt to corresponding requirements.
During operation, light emitted by the light source 10 sequentially reaches the collimation and condensation surface 21, the first micro-lens array surface 22, the projection source 30, the micro-prism array surface 41, the second micro-lens array surface 42 and the receiving surface 50, and the specific principle is as follows: light emitted by the light source 10 is collimated by the collimating and condensing surface 21 and then reaches the first micro-lens array surface 22, so that m light beam units are formed, each light beam unit is selectively output by each corresponding projection image unit 31 to form m sub-object image units, each sub-object image unit is deflected and adjusted by each corresponding wedge-shaped micro-prism unit 411 and then enters each corresponding second micro-lens unit 421, m sub-real image units are obtained, each sub-real image unit realizes composite superposition on the receiving surface 50, and finally, a clear projection real image is obtained. The system adjusts the deflection of the object image by adding the microprism array surface 41, the object image in each optical channel can obtain independent deflection, and the multi-channel optical path imaging composite superposition can be realized for the projection system, so that a clear projection real image is obtained.
The composite projection lens module is actually an optical adder from the mathematical point of view, and the illuminance distribution of the receiving surface 5050 satisfies the following relational expression: e (x, y) ═ Σi＝1..mEi(xi，yi) Where (x, y) is the position coordinate of the receiving surface 5050, E is the illumination of the receiving surface 50, and (x, y) isi，yi) As the position coordinates of the projection source 30, Ei(xi，yi) Is the illuminance of the projection image unit 31 at the receiving surface 50.
In the present embodiment, the collimating and condensing surface 21 is disposed on the collimating lens 21A, the first microlens array surface 22 is disposed on the first multi-channel lens 22A, the collimating lens 21A is disposed on a side of the first multi-channel lens 22A away from the projection source 30, and the first microlens unit 221 may be a plano-convex lens, a biconvex lens, a convex plano lens, or a meniscus lens, or may even be a multi-microlens combination.
Based on the above embodiment, the first microlens array surface 22 is located on the side of the first multi-channel lens 22A away from the projection source 30, the side of the first multi-channel lens 22A close to the projection source 30 is a plane, and the projection source 30 is in close contact with the plane of the first multi-channel lens 22A, so that the utilization rate of the projection source 30 on light energy can be effectively improved, and the length of the whole system can be effectively shortened.
In the present embodiment, the projection source 30 includes at least two kinds of projection image units 31 having different projection images, as shown in fig. 5, the projection image units 31 are provided with at least two kinds, the projection images of the different kinds of projection image units 31 are different, and finally, the different kinds of sub real image units of the formed images are compositely superimposed on the receiving surface 50, so as to form an image-specific projection real image.
In this embodiment, as shown in fig. 3, 5 and 6, a deflection mirror 41A and a second multi-channel lens 42A are disposed between the projection source 30 and the receiving surface 50, the second multi-channel lens 42A is disposed on a side of the deflection mirror 41A away from the receiving surface 50, a micro-prism array surface 41 is disposed on the deflection mirror 41A, the micro-prism array surface 41 can be disposed on any side of the deflection mirror 41A, the thickness of the deflection mirror 41A is small, and the total length of the system can be effectively shortened, the second micro-lens array surface 42 is disposed on the second multi-channel lens 42A, the second micro-lens array surface 42 can be disposed on any side of the second multi-channel lens 42A, the light selected by the projection source 30 passes through the micro-prism array surface 41 and the second micro-lens array surface 42 in sequence, the second micro-lens unit 421 can be a plano-convex lens, lenticular, plano-convex or meniscus lenses, and even multi-microlens combinations.
Based on the above embodiment, as shown in fig. 3, 4 and 5, two micro prism array surfaces 41 are respectively disposed on two side surfaces of the deflection mirror 41A, that is, two micro prism array surfaces 41 are disposed on two side surfaces of the deflection mirror 41A, the two micro prism array surfaces 41 on the two sides are symmetric with respect to the deflection mirror 41A, and an included angle between two inclined surfaces of two wedge-shaped micro prism units 411 having the same central axis is a wedge angle.
In the present embodiment, as shown in fig. 6, a side of the deflection mirror 41A close to the projection source 30 is a microprism array surface 41, and a side of the deflection mirror 41A far from the projection source 30 is a plane; one side of the second multi-channel lens 42A close to the receiving surface 50 is a second micro-lens array surface 42, one side of the second multi-channel lens 42A far away from the receiving surface 50 is a plane, and the plane of the deflection lens 41A is in close contact with the plane of the second multi-channel lens 42A, so that the utilization rate of light energy can be further improved, and meanwhile, the length of the system can be effectively shortened.
In this embodiment, as shown in fig. 7, a projection composite mirror 43 is disposed between the projection source 30 and the receiving surface 50, and the microprism array surface 41 and the second microlens array surface 42 are both disposed on the projection composite mirror 43, that is, the microprism array surface 41 and the second microlens array surface 42 are respectively disposed on two surfaces of the projection composite mirror 43, so that the number of optical components of the system can be effectively reduced, the system has a simple structure and low cost, and because the optical components can cause loss of optical energy, the system can reduce the use of the optical components and can also effectively reduce the loss of optical energy, thereby improving the utilization rate of optical energy; preferably, the collimating and condensing surface 21 and the first microlens array surface 22 are disposed on the same lens, which further simplifies the system structure and reduces the optical energy loss.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. The micro-lens array projection system of the composite micro-prism is characterized by comprising a light source (10), a composite collimating mirror module (20), a projection source (30), a composite projection mirror module (40) and a receiving surface (50) which are sequentially arranged, wherein the composite collimating mirror module (20) comprises a collimation light-collecting surface (21) and a first micro-lens array surface (22), the collimation light-collecting surface (21) is positioned on one side, away from the projection source (30), of the first micro-lens array surface (22), the first micro-lens array surface (22) comprises m first micro-lens units (221) which are arranged in an array manner, and the projection source (30) comprises m projection image units (31) which are arranged in an array manner;
the composite projection mirror module (40) comprises a micro-prism array surface (41) and a second micro-lens array surface (42), the micro-prism array surface (41) is positioned on one side, close to the projection source (30), of the second micro-lens array surface (42), the micro-prism array surface (41) comprises m wedge-shaped micro-prism units (411) which are arranged in an array manner, the second micro-lens array surface (42) comprises m second micro-lens units (421) which are arranged in an array manner, each wedge-shaped micro-prism unit (411) has a common central axis with a first micro-lens unit (221) and a second micro-lens unit (421) which correspond to two sides respectively, and each projection image unit (31) is positioned on the central axis of each wedge-shaped micro-prism unit (411) respectively;
the distance between the first microlens array surface (22) and the second microlens array surface (42) is s, the distance between the microprism array surface (41) and the receiving surface (50) is L', and the focal length f of the first microlens unit (221)1S, the focal length of the second microlens unit (421) is f2＝(L′*s)/(L′+s)；
The wedge angle of the wedge-shaped microprism unit (411) is alphaiL', distance systemThe wedge angle of the ith wedge-shaped micro prism unit (411) of the optical axis satisfies the following relation:
the distance between two adjacent first micro lens units (221), the distance between two adjacent second micro lens units (421) and the distance between two adjacent wedge-shaped micro prism units (411) are d, and n is a refractive index.
2. A projection system according to claim 1, wherein the collimating and condensing surface (21) is disposed on a collimating lens (21A), and the first microlens array surface (22) is disposed on a first multi-channel lens (22A).
3. A composite microprism microlens array projection system according to claim 2 wherein the first microlens array surface (22) is on a side of the first multi-channel lens (22A) remote from the projection source (30), a side of the first multi-channel lens (22A) adjacent to the projection source (30) is planar, and the projection source (30) is in intimate contact with the planar surface of the first multi-channel lens (22A).
4. A composite microprism microlens array projection system according to claim 1, wherein said projection source (30) comprises at least two of said projection image units (31) having different projection images.
5. A projection system according to claim 1, wherein the microprism array surface (41) is disposed on a deflection mirror (41A) and the second microlens array surface (42) is disposed on a second multi-channel lens (42A).
6. A projection system according to claim 5, wherein said microprism array surface (41) is provided on both sides of said deflecting mirror (41A).
7. A projection system of micro-lens array of composite micro-prisms according to claim 5, wherein the side of the deflection optics (41A) close to the projection source (30) is the micro-prism array surface (41), and the side of the deflection optics (41A) far from the projection source (30) is a plane; one side, close to the receiving surface (50), of the second multi-channel lens (42A) is the second micro-lens array surface (42), one side, away from the receiving surface (50), of the second multi-channel lens (42A) is a plane, and the plane of the deflection lens (41A) is in close contact with the plane of the second multi-channel lens (42A).
8. A composite microprismatic microlens array projection system according to claim 1 wherein the microprismatic array surface (41) and the second microlens array surface (42) are disposed on a projection composite mirror (43).
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| CN113031130A (en) * | 2021-03-31 | 2021-06-25 | 广东烨嘉光电科技股份有限公司 | Micro-lens array projection system for oblique projection |
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