CN210372944U - Large-area clear and uniform separated type inclined projection lighting device - Google Patents
Large-area clear and uniform separated type inclined projection lighting device Download PDFInfo
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- CN210372944U CN210372944U CN201921016231.6U CN201921016231U CN210372944U CN 210372944 U CN210372944 U CN 210372944U CN 201921016231 U CN201921016231 U CN 201921016231U CN 210372944 U CN210372944 U CN 210372944U
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Abstract
The utility model discloses a clear even disconnect-type slope projection lighting device of large tracts of land. The LED light source comprises a circuit board, an LED light source, a collimating lens and a micro-lens array combination, wherein the micro-lens array combination comprises a first micro-lens array and a second micro-lens array which are oppositely arranged and a micro-pattern array shading layer positioned between the first micro-lens array and the second micro-lens array; the LED light source is arranged on the circuit board, and the LED light source, the collimating lens, the first micro lens array, the micro pattern array shading layer and the second micro lens array are sequentially arranged along the direction of an optical axis; light rays emitted by the LED light source are emitted in parallel beams after passing through the collimating lens, perpendicularly enter the first micro lens array, and are emitted to an imaging surface from the second micro lens array through the micro pattern array light shielding layer. The utility model can realize longer depth of field, and the patterns at near and far are clear when the oblique incidence is carried out; by changing the shape of each micro-pattern, more light beams can be irradiated to far positions, and the brightness of the image on the imaging surface is consistent no matter the distance from the projection device is far or near.
Description
Technical Field
The present invention relates to a tilted projection lighting device, and more particularly to a device for realizing large-area clear and uniform tilted projection lighting using a microlens array and a microimage array.
Background
Projection technology is widely used in the fields of image display, greeting illumination, stage illumination and the like. The traditional way 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. As shown in fig. 1, the depth of field of the conventional projection method is small, the projected image is only clear at the focus, and the image at a certain distance from the focus becomes blurred. 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 inclined to the image 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.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems existing in the background art, the utility model aims to provide a novel tilting projection lighting structure which can realize large area, clarity and uniform brightness by utilizing the combination of a micro-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 microlens array combination, microlens array combination includes relative first microlens array and the second microlens array of arranging and is located the micropattern array light shield layer between first microlens array and the second microlens array; the LED light source is arranged on the circuit board, the LED light source, the collimating lens, the first micro lens array, the micro pattern array shading layer and the second micro lens array are sequentially arranged along the optical axis direction, the first micro lens array and the second micro lens array are respectively and independently arranged, and the first micro lens array and the second micro lens array are respectively independent existing products; light rays emitted by the LED light source are emitted in parallel light beams after passing through the collimating lens, perpendicularly emitted into the first micro lens array, then pass through the micro pattern array shading layer, and finally emitted to the imaging surface from the second micro lens array.
The large area is more than one meter on a side.
The first micro lens array and the second micro lens array are formed by arranging a plurality of micro 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 different/not completely the same, so that the imaging on the 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 micro-lens arrays, only the micro-pattern part in the light shielding layer with the micro-pattern array is transparent, the other part is opaque, and each micro-pattern in the light shielding layer with the micro-pattern array is different.
Each pair of microlenses corresponds to one micropattern, that is to say a plurality of different micropatterns are sandwiched between two microlens 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 number of the micro lenses in the first micro lens array and the second micro lens array is the same as that of the light shielding sheets of the light shielding layer of the micro pattern array, the first micro lens array and the second micro lens array are arranged symmetrically with the light shielding layer of the micro pattern array, and light rays enter one micro lens of the first micro lens array and then are converged through a partial light path of the light shielding sheet of the corresponding light shielding layer of the micro pattern array and then are converged and emitted through the micro lens of the corresponding second micro lens array.
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 two side surfaces of the micro-lenses in the first micro-lens array and the second micro-lens array are respectively a plane and a convex surface: the plane of the micro lens of the first micro lens array is back to the collimating lens and the LED light source, and the convex surface of the micro lens faces the collimating lens and the LED light source; the plane of the micro-lenses of the second micro-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 utility model has the advantages that:
the utility model discloses when the slope throws, every microlens adds a micropattern and can all throw a relatively weak pattern at the imaging surface, and superpose these patterns together alright in order to form holistic projection effect. 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.
In addition, more light beams can be irradiated to a far position by changing the shape of each micro pattern, so that the image brightness of the imaging surface is consistent no matter the distance from the projection device.
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 diagram of a conventional projection apparatus;
FIG. 2 is an imaging principle of a single microlens;
fig. 3 is an imaging principle of a plurality of microlenses.
FIG. 4 is one example of several micropattern designs in a micropattern array;
FIG. 5 illustrates a second example of several micropattern designs in a micropattern array;
fig. 6 is a schematic structural diagram of an embodiment of the projection lighting apparatus of the present invention.
In the figure: the LED light source comprises a circuit board (1), an LED light source (2), a collimating lens (3), a first micro lens array (4), a micro pattern array shading layer (5) and a second micro lens array (6).
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
The principle of the device of the present invention is shown in fig. 2 and 3. As can be seen in fig. 2, the clear aperture of each microlens is very small (typically less than 1mm), and the depth of field of the image becomes very long. Therefore, the projected image in a long range before and after the focus can be made clear.
As can be seen in fig. 3, when light is simultaneously projected and imaged from different positions and angles by sets of microlenses and micropatterns, image superimposition occurs before and after the focal length. The image produced at the front and rear positions of the focal distance and the image size at the focal point are brought closer by the image superimposition. The greater the number of microlenses and micropatterns in the microlens array and micropattern array, the sharper the superimposed image at off-focus distances and the closer the size of the image at focus.
In addition, if the same micro-pattern is used for each pair of micro-lenses, light is relatively strong at a position close to the projection device and light is relatively weak at a position far from the projection device during oblique projection illumination. The image thus formed will be brighter at close and dimmer at far. In this utility model, the shapes of different micro-patterns are designed, so that more light beams irradiate the far place of the imaging surface, and less light beams irradiate the near place of the imaging surface.
As shown in fig. 6, the embodied apparatus includes a circuit board 1, an LED light source 2, a collimating lens 3, and a microlens array combination/microlens structure, the microlens array combination including a first microlens array 4 and a second microlens array 6 arranged oppositely, and a micropattern array light shield layer 5 located between the first microlens array 4 and the second microlens array 6. The LED light source 2 is arranged on the circuit board 1, and the LED light source 2, the collimating lens 3, the first micro lens array 4, the micro pattern array shading layer 5 and the second micro lens array 6 are sequentially arranged along the optical axis direction; the light emitted by the LED light source 2 passes through the collimating lens 3 and then is emitted as a parallel light beam, and then perpendicularly enters the first microlens array 4, passes through the light shielding layer 5 of the micropattern array, and finally is emitted from the second microlens array 6 to the imaging surface, which may not be perpendicular to the optical axis in specific implementations.
The first micro lens array 4 and the second micro lens array 6 are formed by arranging a plurality of micro lenses 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 transparent on each light shielding sheet of the micro pattern array light shielding layer, the part outside the micro patterns are opaque, and the shapes of the micro patterns on each light shielding sheet are different/not identical, so that the imaging on an imaging surface which is not perpendicular to the optical axis is clear and bright.
The micro lenses in the first micro lens array 4 and the second micro lens array 6 and the light shielding sheets of the micro pattern array light shielding layer 5 are same in quantity and are in one-to-one correspondence, the micro lenses of the first micro lens array 4, the light shielding sheets of the micro pattern array light shielding layer 5 and the micro lenses of the second micro lens array 6 are arranged on the same straight line parallel to the optical axis, the first micro lens array 4 and the second micro lens array 6 are arranged symmetrically with the micro pattern array light shielding layer 5, and light rays enter one micro lens of the first micro lens array 4 and then are converged through a light shielding sheet shielding part of the corresponding micro pattern array light shielding layer 5 and then are converged and emitted through the corresponding micro lenses of the second micro lens array 6.
In specific implementation, the two side surfaces of the collimating lens 3 are respectively a plane and a convex surface, the plane faces the LED light source 2, and the convex surface faces away from the LED light source 2.
The two side surfaces of the microlenses in the first microlens array 4 and the second microlens array 6 are respectively a plane and a convex surface: the plane of the micro-lenses of the first micro-lens array 4 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 microlenses of the second microlens array 6 have their flat faces facing the collimating lens 3 and the LED light source 2 and their convex faces facing away from the collimating lens 3 and the LED light source 2.
In a specific implementation, the first microlens array 4 and the second microlens array 6 are composed of tens, hundreds, or even thousands of circular convex microlenses. The microlenses are arranged in a planar array in a triangular configuration, arranged in a hexagon as shown in fig. 3, with an angle of 60 degrees between the centers of the circles.
Each pair of microlenses corresponds to a single micropattern, that is to say several tens, hundreds or even thousands of different micropatterns are sandwiched between two microlens arrays. Most micropatterns are only a portion of them compared to the complete pattern illuminated on the imaging surface.
For an oblique imaging plane which is not perpendicular to the optical axis, the transmission setting of the micro-pattern for displaying the content at the farther part of the imaging plane is more, and the transmission setting of the micro-pattern for displaying the content at the closer part of the imaging plane is less. The display regions may be provided in a stepwise increasing/decreasing number of patterns, as shown in fig. 5, such as english letters of Happy in the overall projection pattern. In the micro-pattern combination, a part contains appy pattern, a part contains ppy pattern, and another part contains py only, as shown in FIG. 4. After the angle between the parallel light emitted from the collimating lens and the imaging plane and the size of the imaged image are determined, the size of each micro pattern in the micro pattern array can be determined according to the energy difference of the light beam irradiating different positions on the imaging plane. The arrangement of these different micropatterns may be random, without order and positional requirements. Thus, when the projection is inclined, the distant pattern has more overlapped projected images, thereby compensating the phenomenon of weak light at a long distance.
Fig. 4 and 5 illustrate an example of a different micropattern design. Most micropatterns are only a portion of them, as compared to the complete pattern projected onto the imaging surface.
Examples
The utility model discloses an embodiment is seen in figure 6. The core component of this embodiment comprises a circuit board 1, an LED light source 2, a collimating lens 3 and a microlens array combination, the microlens array combination comprising a first microlens array 4 and a second microlens array 6 arranged oppositely and a micropattern array light shield layer 5 located between the first microlens array 4 and the second microlens array 6; the light-shielding layer 5 of the micro-pattern array is a glass plate with a surface coating of the micro-pattern array.
The collimating lens 3 is installed in front of the LED light source 2, and the two microlens array optical lenses 4 and 6 and the micro pattern array shade 5 are installed in one installation groove.
Wherein the convex surface of the collimating lens 3 faces away from the LED light source 2. The convex surface of the first microlens array optical sheet 4 faces the collimator lens 3. A micro pattern array glass plate 5 is installed between the two micro lens array optical glasses 4 and 6. The convex surface of the second microlens array optical lens 6 faces away from the micro light-transmitting sheet 5 and faces the outside of the greeting lamp.
The two microlens array lenses are provided with a plurality of identical microlenses, the number of the identical microlenses is identical, the arrangement of the identical microlenses is identical, and the microlenses are in one-to-one correspondence. The diameter of each microlens is less than 1 mm.
The micro-pattern array glass sheet is provided with a micro-pattern layer on one side surface. Each micro pattern corresponds to a pair of micro lenses. The pattern is partially transparent and the other part is opaque. And each micropattern in the array of micropatterns is different.
Each pair of microlenses plus a micropattern can project a relatively weak pattern on the imaging surface, and the patterns are superposed together to form an integral projection effect on the imaging surface.
The above description is only two specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through creative work should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.
Claims (5)
1. The utility model provides a clear even disconnect-type slope projection lighting device of large tracts of land which characterized in that: the LED light source 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 (4) and the second micro-lens array (6); the LED light source (2) is arranged on the circuit board (1), the LED light source (2), the collimating lens (3), the first micro lens array (4), the micro pattern array shading layer (5) and the second micro lens array (6) are sequentially arranged along the optical axis direction, and the first micro lens array (4) and the second micro lens array (6) are independently arranged; light rays emitted by the LED light source (2) are emitted as parallel light beams after passing through the collimating lens (3), perpendicularly enter the first micro lens array (4), pass through the micro pattern array light shielding layer (5), and finally are emitted to an imaging surface from the second micro lens array (6).
2. A large area clear uniform split-type oblique projection illumination device as claimed in claim 1, wherein: the first micro lens array (4) and the second micro lens array (6) are formed by arranging a plurality of micro lenses 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 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 the light shielding sheets are different/not identical, so that an image on an imaging plane which is not perpendicular to the optical axis is clear, and the far and near brightness is consistent.
3. A large area clear uniform split-type oblique projection illumination device as claimed in claim 1, wherein: the number of the micro lenses in the first micro lens array (4) and the second micro lens array (6) is the same as that of the light shielding sheets of the micro pattern array light shielding layer (5), the first micro lens array (4) and the second micro lens array (6) are arranged symmetrically with the micro pattern array light shielding layer (5), and light rays enter one micro lens of the first micro lens array (4) and then are converged through a light path of a part of the light shielding sheets of the corresponding micro pattern array light shielding layer (5) and then are converged and emitted through the micro lens of the corresponding second micro lens array (6).
4. A large area clear uniform split-type oblique projection illumination device as claimed in 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 (2).
5. A large area clear uniform split-type oblique projection illumination device as claimed in claim 1, wherein: the two side surfaces of the micro lenses in the first micro lens array (4) and the second micro lens array (6) are respectively a plane and a convex surface: the plane of the micro lens of the first micro lens array (4) is back to the collimating lens (3) and the LED light source (2), and the convex surface faces the collimating lens (3) and the LED light source (2); the plane of the micro-lenses of the second micro-lens array (6) 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).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921016231.6U CN210372944U (en) | 2019-07-02 | 2019-07-02 | Large-area clear and uniform separated type inclined projection lighting device |
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| CN201921016231.6U CN210372944U (en) | 2019-07-02 | 2019-07-02 | Large-area clear and uniform separated type inclined projection lighting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114527619A (en) * | 2022-04-21 | 2022-05-24 | 宁波福尔达智能科技股份有限公司 | Carpet lamp and vehicle |
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- 2019-07-02 CN CN201921016231.6U patent/CN210372944U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114527619A (en) * | 2022-04-21 | 2022-05-24 | 宁波福尔达智能科技股份有限公司 | Carpet lamp and vehicle |
| CN114527619B (en) * | 2022-04-21 | 2022-07-29 | 宁波福尔达智能科技股份有限公司 | Carpet lamp and vehicle |
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