CN214174812U - Novel oblique projection device - Google Patents
Novel oblique projection device Download PDFInfo
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- CN214174812U CN214174812U CN202023117198.1U CN202023117198U CN214174812U CN 214174812 U CN214174812 U CN 214174812U CN 202023117198 U CN202023117198 U CN 202023117198U CN 214174812 U CN214174812 U CN 214174812U
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Abstract
The invention discloses a novel inclined projection device. The LED light source is arranged on the circuit board, and the micro-lens array combination comprises a first Fresnel lens array and a second Fresnel lens array which are oppositely arranged and a micro-pattern array shading layer positioned between the first Fresnel lens array and the second Fresnel lens array; the LED light source, the collimating lens, the first Fresnel lens array, the micro-pattern array light shielding layer and the second Fresnel lens array are sequentially arranged along the optical axis direction; light rays emitted by the LED light source are emitted as parallel light beams after passing through the collimating lens, perpendicularly emitted into the first Fresnel lens array, and emitted from the second Fresnel lens array to the imaging surface through the micro-pattern array light shielding layer. The utility model discloses a fresnel lens array reduces lens array height, reduces the device volume, and compact tilting device structure, and reduce lens height, the corresponding processing degree of difficulty and cost, just the utility model discloses can realize longer depth of field, near and distant pattern can all be very clear when oblique shooting, can be used for technical field such as lamps and lanterns illumination.
Description
Technical Field
The present invention relates to a projection lighting device of slope, in particular to a device for realizing large-area clear and uniform inclined projection lighting by using a fresnel lens array and a micro image array.
Background
Projection technology is widely used in the fields of image display, greeting illumination, stage illumination and the like. The traditional method is to realize the image projection and illumination functions through the lens combination and the structure of the film. Film is a commonly used film with a designed design, like a photographic negative. The light source irradiates the film after being integrated by one group of lenses, and then the patterns on the film are displayed on an imaging surface by the refraction of the other group of lenses.
This conventional approach is simple but has many application limitations. The depth of field of the traditional projection method is very small, a projected image is clear only at a focus, and the image at a certain distance away from the focus becomes fuzzy. This method is therefore suitable only for front projection illumination. If the method is used for oblique projection illumination, the distance from the imaging surface to the projection device is different, and the image is clear only when the distance is equal to the focal length and is not clear in other places. In addition, in the case of large-area projection illumination, the brightness of the image will be lower the farther away, and the effect will be worse.
In many cases, the projection device can only be placed or mounted perpendicular to the imaging plane. Thus, there is a need for a new method for achieving a large-area, clear, and uniformly bright projected image on an imaging surface when the projection device is tilted at an angle (0-90 °) to the imaging surface, despite the fact that the distances of the projection device to different positions on the imaging surface are not uniform.
In the prior art, a separate oblique projection lighting device exists, wherein a microlens array and a microimage array are adopted to realize large-area clear uniform oblique projection lighting, the microlens array adopted in the method is higher in height, so that the whole oblique projection device is larger in size, and when the height of the microlens array exceeds 50 micrometers, the difficulty in processing is larger.
Based on this, the utility model provides a new slope projection arrangement adopts fresnel lens array, reduces lens array height, reduces the device volume, compact tilting device structure. And the height of the lens is reduced, the processing difficulty is correspondingly reduced, and the cost is reduced.
Disclosure of Invention
In order to solve the problems existing in the background art, the utility model aims to provide a novel tilting projection lighting device which can realize large area, clarity and uniform brightness by utilizing the combination of a Fresnel lens array and a micro-pattern array.
The utility model discloses the technical scheme who adopts as follows:
the utility model discloses a circuit board, LED light source, collimating lens and micropattern array light shield layer, the LED light source is installed on the circuit board, its characterized in that: the Fresnel lens array combination comprises a first Fresnel lens array and a second Fresnel lens array which are oppositely arranged, and the micro-pattern array light shielding layer is arranged between the first Fresnel lens array and the second Fresnel lens array; the LED light source, the collimating lens, the first Fresnel lens array, the micro-pattern array light shielding layer and the second Fresnel lens array are sequentially arranged along the optical axis direction, and the first Fresnel lens array and the second Fresnel lens array are independently installed; light rays emitted by the LED light source are emitted in parallel light beams after passing through the collimating lens, then perpendicularly emitted into the first Fresnel lens array, transmitted and then emitted to an imaging surface from the second Fresnel lens array after passing through the micro-pattern array light shielding layer.
The first Fresnel lens array and the second Fresnel lens array are formed by arranging a plurality of Fresnel lenses in a plane array perpendicular to an optical axis, the micro-pattern array light shielding layer is formed by arranging a plurality of light shielding sheets with micro-patterns in a plane array perpendicular to the optical axis, only part of the micro-patterns are transparent on each light shielding sheet of the micro-pattern array light shielding layer, the parts outside the micro-patterns are opaque, and the shapes of the micro-patterns on each light shielding sheet are not completely the same, so that imaging on an imaging surface which is not perpendicular to the optical axis is clear and the far and near brightness is kept consistent.
A light shielding layer with a micro-pattern array is arranged between the two Fresnel lens arrays, only the micro-pattern part in the light shielding layer with the micro-pattern is transparent, the other part is opaque, and each micro-pattern in the light shielding layer with the micro-pattern array is different.
Each fresnel lens corresponds to a micro-pattern, that is, a plurality of different micro-patterns are sandwiched between two fresnel lens arrays. Most micropatterns are only a portion of them compared to the complete pattern illuminated on the imaging surface. By adjusting the shapes of the micro patterns on different light shielding sheets, more light beams can irradiate the far position of the imaging surface, and less light beams can irradiate the near position of the imaging surface. Therefore, the problem that the distance is darker than the near part can be avoided, the brightness of the pattern on the imaging surface is uniformly distributed, and the effect of brightness, dazzling and clearness at the distance is realized.
The Fresnel lens array and the second Fresnel lens array are provided with the same number of light-shielding sheets of the light-shielding layer of the micro-pattern array, the first Fresnel lens array and the second Fresnel lens array are arranged symmetrically with the light-shielding layer of the micro-pattern array, light rays are incident to one Fresnel lens of the first Fresnel lens array and then converged, and then are converged and emitted after passing through a light path of a shielding part of the light-shielding sheet of the corresponding micro-pattern array and then passing through one Fresnel lens of the corresponding second Fresnel lens array.
The Fresnel lens is characterized in that the surface of the cross section of the Fresnel lens is composed of a series of sawtooth grooves, the central part of the Fresnel lens is an elliptic arc line, angles between each groove and adjacent grooves are different, but light rays are concentrated at one position to form a central focus, and each groove is regarded as an independent small lens to regulate the light rays into parallel light or light condensation.
The two side surfaces of the Fresnel lens in the first Fresnel lens array and the second Fresnel lens array are respectively a plane and a convex surface: the plane of the Fresnel lens of the first Fresnel lens array faces away from the collimating lens and the LED light source, and the convex surface faces towards the collimating lens and the LED light source; the plane of the Fresnel lens of the second Fresnel lens array faces the collimating lens and the LED light source, and the convex surface faces away from the collimating lens and the LED light source.
The surfaces of two sides of the collimating lens are respectively a plane and a convex surface, and the convex surface faces away from the LED light source.
The utility model has the advantages that:
the utility model provides a novel slope projection arrangement adopts fresnel lens array, reduces lens array height, reduces the device volume, compact tilting device structure to lens height reduces, the corresponding reduction of the processing degree of difficulty, cost reduction. The projection mode can realize longer depth of field, and patterns at near and far positions can be very clear during oblique incidence, so that the oblique projection illumination with large area, clarity and uniform brightness is realized, and the oblique projection illumination device can be used in the technical fields of lamp illumination and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the prior art of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings can be derived from these drawings by a person skilled in the art without inventive effort.
FIG. 1 is a schematic view of a prior art projection device;
FIG. 2 is a schematic view of a projection apparatus of the present invention;
FIG. 3 is a schematic diagram of a single Fresnel lens, with 3a, 3b being schematic side and front views, respectively, of a single Fresnel lens;
FIG. 4 is a schematic view of a micro-pattern array, 4a, 4b are different micro-patterns.
In the figure, 1, a circuit board, 2, an LED light source, 3, a collimating lens, 4, a first microlens array, 5, a micro-pattern array, 6, a second microlens array, 7, a first fresnel lens array, 8, a second fresnel lens array, 9, a fresnel lens, 51, a first micro-pattern, 52, and a second micro-pattern.
Detailed Description
The invention is further illustrated by the following figures and examples.
Fig. 1 is a schematic view of a prior art projection apparatus. The device comprises a circuit board 1, an LED light source 2, a collimating lens 3 and a micro-lens array combination, wherein the micro-lens array combination comprises a first micro-lens array 4 and a second micro-lens array 6 which are oppositely arranged and a micro-pattern array shading layer 5 positioned between the first micro-lens array and the second micro-lens array. The device uses the micro-lens array to realize large-area clear projection, but the micro-lens array causes the volume of the whole inclined projection device to be larger due to the higher height of the micro-lens array, and the difficulty is larger during processing and the manufacturing cost is high when the height of the micro-lens array exceeds 50 micrometers.
Based on this, the present invention provides a new projection device as shown in fig. 2, which includes a circuit board 1, an LED light source 2, a collimating lens 3 and a fresnel lens array combination in this embodiment, where the fresnel lens array combination includes a first fresnel lens array 7 and a second fresnel lens array 8 arranged oppositely and a micro-pattern array light shielding layer 5 located between the first fresnel lens array and the second fresnel lens array; the LED light source 2 is arranged on the circuit board 1, the LED light source 2, the collimating lens 3, the first Fresnel lens array 7, the micro-pattern array shading layer 5 and the second Fresnel lens array 8 are sequentially arranged along the optical axis direction, and the first Fresnel lens array 7 and the second Fresnel lens array 8 are independently arranged; the first Fresnel lens array and the second Fresnel lens array are independent existing products respectively; light rays emitted by the LED light source 2 pass through the collimating lens 3 and then are emitted as parallel light beams, perpendicularly enter the first Fresnel lens array 7, pass through the micro-pattern array light shielding layer 5 and finally are emitted to an imaging surface from the second Fresnel lens array 8.
The first fresnel lens array 7 and the second fresnel lens array 8 are formed by arranging a plurality of fresnel lenses in a planar array perpendicular to an optical axis, the micro-pattern array light-shielding layer 5 is formed by arranging a plurality of light-shielding sheets with micro-patterns in a planar array perpendicular to the optical axis, only part of the micro-patterns are transparent on each light-shielding sheet of the micro-pattern array light-shielding layer, and the parts except the micro-patterns are opaque, as shown in fig. 4, and the shapes of the micro-patterns on each light-shielding sheet are not completely the same as those shown in fig. 4a and 4b, so that an image on an imaging surface which is not perpendicular to the optical axis is clear, and the far and near brightness is consistent.
Each pair of fresnel lenses corresponds to a micro-pattern, that is to say a plurality of different micro-patterns are sandwiched between two fresnel lens arrays as shown in fig. 4a and 4 b. Most micropatterns are only a portion of them compared to the complete pattern illuminated on the imaging surface. The first micro-pattern 51 has a small number of light-transmitting portions in shape in fig. 4a, and thus a small number of light beams are irradiated to a closer area of the image plane, and the second micro-pattern 52 has a large number of light-transmitting portions in shape in fig. 4b, so that a large number of light beams are irradiated to a farther area of the image plane. Therefore, the problem that the distance is darker than the near part can be avoided, the brightness of the pattern on the imaging surface is uniformly distributed, and the effect of brightness, dazzling and clearness at the distance is realized.
The number of the Fresnel lenses in the first Fresnel lens array 7 and the number of the Fresnel lenses in the second Fresnel lens array 8 are the same as that of the light shielding sheets of the micro-pattern array light shielding layer 5, and light rays enter one Fresnel lens of the first Fresnel lens array 7 and then are converged through a light path of a shielding sheet part of the corresponding micro-pattern array light shielding layer 5 and then are converged and emitted through the corresponding second Fresnel lens array Fresnel lens 8.
As shown in fig. 3a and 3b, the fresnel lens 9 surface in this embodiment is composed of a series of saw-tooth grooves, the central part of which is an elliptical arc. The angle between each groove and the adjacent groove is different, but the light rays are concentrated at one position to form a central focus. Each groove can be viewed as a separate lenslet that collimates or concentrates light.
The surfaces of two sides of the collimating lens 3 are respectively a plane and a convex surface, and the convex surface faces away from the LED light source 2.
The two side surfaces of the fresnel lenses in the first fresnel lens array 7 and the second fresnel lens array 8 are respectively a plane and a convex surface: the plane of the Fresnel lens of the first Fresnel lens array 7 faces away from the collimating lens and the LED light source, and the convex surface faces towards the collimating lens and the LED light source; the plane of the fresnel lens of the second fresnel lens array 8 faces the collimating lens and the LED light source, and the convex surface faces away from the collimating lens and the LED light source.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any person skilled in the art will not depart from the technical scope of the present invention and make some modifications and changes using the above disclosed technical content to equivalent embodiments of equivalent changes, and will still belong to the technical solution of the present invention according to any modifications and changes made to the above embodiments by the technical spirit of the present invention.
Claims (6)
1. The utility model provides a novel oblique projection device, includes circuit board (1), LED light source (2), collimating lens (3) and micropattern array light shield layer (5), and install on circuit board (1) LED light source (2), its characterized in that: the Fresnel lens array combination comprises a first Fresnel lens array (7) and a second Fresnel lens array (8) which are oppositely arranged, and the micro-pattern array light shielding layer (5) is arranged between the first Fresnel lens array (7) and the second Fresnel lens array (8); the LED light source (2), the collimating lens (3), the first Fresnel lens array (7), the micro-pattern array light shielding layer (5) and the second Fresnel lens array (8) are sequentially arranged along the optical axis direction, and the first Fresnel lens array (7) and the second Fresnel lens array (8) are independently installed; light rays emitted by the LED light source (2) are emitted as parallel light beams after passing through the collimating lens (3), then perpendicularly emitted into the first Fresnel lens array (7), transmitted and then emitted to an imaging surface from the second Fresnel lens array (8) after passing through the micro-pattern array light shielding layer (5).
2. The novel oblique projection device of claim 1, wherein: the first Fresnel lens array (7) and the second Fresnel lens array (8) are formed by arranging a plurality of Fresnel lenses (9) in a plane array perpendicular to an optical axis, the micro-pattern array light shielding layer (5) is formed by arranging a plurality of light shielding sheets with micro-patterns in a plane array perpendicular to the optical axis, only part of the micro-patterns are transmitted on each light shielding sheet of the micro-pattern array light shielding layer (5), the part outside the micro-patterns are not transmitted, and the shapes of the micro-patterns on the light shielding sheets are not completely the same, so that an image on an imaging surface which is not perpendicular to the optical axis is clear, and the far and near brightness is consistent.
3. The novel oblique projection device of claim 1, wherein: fresnel lens (9) in first Fresnel lens array (7) and second Fresnel lens array (8) and the anti-dazzling screen quantity of micro pattern array light shield layer (5) all are the same, first Fresnel lens array (7) and second Fresnel lens array (8) are arranged and are symmetrical with micro pattern array light shield layer (5), light is incident to a Fresnel lens (9) of first Fresnel lens array (7) and is converged, then through corresponding micro pattern array light shield layer (5) anti-dazzling screen part light path after through corresponding Fresnel lens (9) of second Fresnel lens array (8) and then is emergent and converged.
4. The novel oblique projection device of claim 1, wherein: the surface of the section of the Fresnel lens (9) is composed of a series of sawtooth-shaped grooves, the central part of the Fresnel lens is an elliptic arc line, angles between each groove and adjacent grooves are different, but light rays are concentrated at one position to form a central focus, and each groove is regarded as an independent small lens to regulate the light rays into parallel light or light condensation.
5. The novel oblique projection device of claim 1, wherein: the two side surfaces of the Fresnel lens (9) in the first Fresnel lens array (7) and the second Fresnel lens array (8) are respectively a plane and a convex surface: the plane of a Fresnel lens (9) of the first Fresnel lens array (7) faces away from the collimating lens (3) and the LED light source (2), and the convex surface faces towards the collimating lens (3) and the LED light source (2); the plane of the Fresnel lens (9) of the second Fresnel lens array (8) faces the collimating lens (3) and the LED light source (2), and the convex surface faces away from the collimating lens (3) and the LED light source (2).
6. The novel oblique projection device of claim 1, wherein: the surfaces of two sides of the collimating lens (3) are respectively a plane and a convex surface, and the convex surfaces face away from the LED light source.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023117198.1U CN214174812U (en) | 2020-12-22 | 2020-12-22 | Novel oblique projection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023117198.1U CN214174812U (en) | 2020-12-22 | 2020-12-22 | Novel oblique projection device |
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| CN214174812U true CN214174812U (en) | 2021-09-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114397300A (en) * | 2021-12-10 | 2022-04-26 | 慧三维智能科技(苏州)有限公司 | High bright face defect detection device based on microlens array projection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114397300A (en) * | 2021-12-10 | 2022-04-26 | 慧三维智能科技(苏州)有限公司 | High bright face defect detection device based on microlens array projection |
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