CN114967163A - Light uniformizing device, projector and design method of light uniformizing device - Google Patents
Light uniformizing device, projector and design method of light uniformizing device Download PDFInfo
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Abstract
The invention provides a light uniformizing device, which comprises: the first cylindrical mirror units comprise first optical surfaces and second optical surfaces, the first optical surfaces are formed by scanning convex curves along vertical planes of the first cylindrical mirror units, and the second optical surfaces are planes; the second optical surface is formed by sweeping a concave curve along a vertical plane of the second cylindrical lens unit, and the fourth optical surface is a plane, wherein the fillet radius of the concave curve meets the process requirements of the machining and production processes; the first cylindrical mirror units and the second cylindrical mirror units are alternately and adjacently arranged to form a cylindrical mirror array, a bus of the cylindrical mirror array is formed by a convex curve and a concave curve through the array, the projection length of the convex curve on a vertical plane of the cylindrical mirror array is larger than that of the concave curve, and the plane of the cylindrical mirror array is formed by a second optical surface and a fourth optical surface through the array. The invention designs and adjusts the surface type of the cylindrical mirror array in a partitioning manner so as to improve the manufacturability.
Description
Technical Field
The present invention relates to the field of optical lenses, and more particularly, to a light uniformizing apparatus, a projector, and a method for designing a light uniformizing apparatus.
Background
The cylindrical surface structure on the surface of the cylindrical mirror array can focus incident light on a line or change the aspect ratio of an image and stretch the image. Compared with a large cylindrical mirror, the cylindrical mirror array expands incident light into linearity and also homogenizes light source energy along the expansion direction. Therefore, cylindrical mirror arrays are often used for focusing and homogenizing laser or illumination light in one dimension.
In the conventional design of a cylindrical mirror array, only the design of a single cylindrical mirror unit is usually considered, and then a plurality of same cylindrical mirror units are directly arranged to form an array, or are arranged in a simple rotational symmetry manner to form an array. The design can meet the manufacturing requirement of a light distribution angle with a small angle, but when the light distribution is required with a large angle, as shown in figure 1, the intersection position of two cylindrical mirrors has large-angle inclination, and simultaneously, a sharp angle also appears. In the design process, the requirement on the surface type precision at the sharp corner is extremely high; during processing and manufacturing, the sharp corners are easy to deform and cannot meet the design requirements, and the sharp corners are easy to cause die damage and influence the service life of the die and the profile of a processed surface.
The statements in this background section merely disclose technology known to the inventors and do not, of course, represent prior art in the art.
Disclosure of Invention
In view of one or more of the above-identified deficiencies, the present invention provides a light homogenizing device comprising:
a plurality of first cylindrical mirror units including a first optical surface formed by a convex curve swept along a vertical plane of the first cylindrical mirror units and a second optical surface which is a plane; and
a plurality of second cylindrical lens units, each second cylindrical lens unit comprising a third optical surface and a fourth optical surface, the third optical surface being formed by a concave curve swept along a vertical plane of the second cylindrical lens unit, the fourth optical surface being a plane, wherein a fillet radius of the concave curve meets process requirements for machining and manufacturing;
the first cylindrical mirror units and the second cylindrical mirror units are alternately and adjacently arranged to form a cylindrical mirror array, a bus of the cylindrical mirror array is formed by the convex curve and the concave curve through the array, the projection length of the convex curve on a vertical plane of the cylindrical mirror array is larger than that of the concave curve, and the plane of the cylindrical mirror array is formed by the second optical surface and the fourth optical surface through the array.
According to an aspect of the invention, wherein the slope of the convex curve at the intersection with the concave curve is equal.
According to an aspect of the present invention, wherein a ratio of a projected length of the convex curve to a projected length of the concave curve is 3 or more.
According to an aspect of the present invention, wherein the convex curve is an axisymmetric curve, and the slope of the curve on both sides of the symmetry axis thereof changes continuously monotonously.
According to an aspect of the present invention, wherein the concave curve is an axisymmetric curve, and the slope of the curve on both sides of the symmetry axis thereof changes continuously monotonously.
According to an aspect of the invention, wherein the slope of the convex curve and the slope of the concave curve are largest at the intersection.
According to an aspect of the invention, wherein the convex curve has a vertex, the perpendicular to the vertex being parallel to the direction of the incident light; the concave curve has a vertex whose perpendicular to the incident light direction is parallel.
According to an aspect of the present invention, an angle range of the outgoing light of the cylindrical mirror array is greater than or equal to 100 °, and the angle range of the outgoing light is a full-width angle of a maximum light intensity.
According to one aspect of the invention, the angle of emergent light of the cylindrical mirror array is in the range of 100-130 degrees.
According to an aspect of the invention, wherein the curve equation of the convex curve is a polynomial equation curve or a bezier curve or a free curve, and the curve equation of the concave curve is a polynomial equation curve or a bezier curve or a free curve.
According to an aspect of the invention, wherein the curvature of the convex curveEquation of the line Z A Satisfy for the polynomial equation curve:
curve equation Z of the concave curve B Satisfy for the polynomial equation curve:
Z B ＝Z A (LA)-Z B0 (LA)+Z B0 ,Y∈[LA,LA+2LB]
Z A ′(LA)＝Z B ′(LA)
wherein, C A Is the curvature of the convex curve, K A Is the conic coefficient of the convex curve, C B Is the curvature of the concave curve, K B Is the conic coefficient of the concave curve.
The present invention also provides a projector comprising:
a light source for generating a light beam; and
according to the light uniformizing device, the light intensity of the light beam passing through the light uniformizing device in the emergent light direction is uniformly distributed.
According to an aspect of the invention, the projector further comprises:
and the collimating lens is arranged between the light source and the light homogenizing device and is used for projecting the light beam to the light homogenizing device after being collimated.
The invention also provides a design method of the dodging device, which comprises the following steps:
s10: designing a plurality of first cylindrical mirror units, wherein the first cylindrical mirror units comprise a first optical surface and a second optical surface, the first optical surface is formed by a convex curve sweeping along a vertical plane of the first cylindrical mirror units, and the second optical surface is a plane;
s20: designing a plurality of second cylindrical lens units, wherein each second cylindrical lens unit comprises a third optical surface and a fourth optical surface, the third optical surface is formed by sweeping a concave curve along a vertical plane of the second cylindrical lens unit, and the fourth optical surface is a plane, wherein the fillet radius of the concave curve meets the process requirements of the machining and production processes;
s30: the first cylindrical mirror units and the second cylindrical mirror units are alternately and adjacently arranged to form a cylindrical mirror array, a bus of the cylindrical mirror array is formed by the convex curve and the concave curve through the array, and the projection length of the convex curve on the vertical plane of the cylindrical mirror array is greater than that of the concave curve;
s40: and adjusting parameters of the convex curve according to the parameters of the concave curve so as to enable the light intensity in the emergent light direction to be uniformly distributed.
According to the invention, based on the design of the cylindrical mirror units, the surface type of the cylindrical mirror array is designed and adjusted in a partitioned manner, so that the intersection positions of the two cylindrical mirror units form a circular bead, and the manufacturability is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure. In the drawings:
FIG. 1 is a schematic diagram showing the appearance of sharp corners at the intersection of two cylindrical mirror units in a conventional cylindrical mirror array;
FIGS. 2a and 2b show schematic views of a light unifying apparatus according to an embodiment of the present invention;
FIG. 3 shows a schematic view of a light unifying apparatus according to another embodiment of the present invention;
FIG. 4 shows an angular light intensity distribution plot of the embodiment of FIG. 3;
FIG. 5 shows a comparison of the illumination effect and the illuminance distribution curve of the embodiment of FIG. 3;
FIGS. 6a and 6b show schematic diagrams of convex and concave curves for one embodiment of the present invention;
FIG. 7 is a flow chart of a method for designing a light homogenizing device according to an embodiment of the present invention.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection, either mechanically, electrically, or in communication with each other; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
The invention provides a light homogenizing device and a design method thereof by combining the requirements of design and processing, and can well solve the problems of processing difficulty or easy damage of a die caused by the traditional design method.
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Fig. 2a and 2b show schematic diagrams of a light unifying apparatus according to an embodiment of the present invention, and the light unifying apparatus 100 includes a plurality of first cylindrical mirror units 101 and a plurality of second cylindrical mirror units 102, as follows:
the first cylindrical mirror unit 101 includes a first optical surface S1 and a second optical surface S2, the first optical surface S1 is formed by a convex curve sweeping along a vertical plane (a plane perpendicular to the paper) of the first cylindrical mirror unit 101, the second optical surface S2 is a plane, the first optical surface S1 and the second optical surface S2 are disposed opposite to each other, and incident light sequentially passes through the first optical surface S1 and the second optical surface S2 and then exits.
The second cylindrical lens unit 102 includes a third optical surface S3 and a fourth optical surface S4, the third optical surface S3 is formed by a concave curve sweeping along a vertical plane (a plane perpendicular to the paper surface) of the second cylindrical lens unit 102, the fourth optical surface S4 is a plane, the third optical surface S3 and the fourth optical surface S4 are disposed opposite to each other, and incident light sequentially passes through the third optical surface S3 and the fourth optical surface S4 and then exits. Wherein the fillet radius of the concave curve meets the process requirements of manufacturing, as will be further described by the embodiments below. The technical requirement refers to that in the actual processing and production process, such as the processes of mold manufacturing, injection molding, micro-nano processing, nano imprinting and the like, the process is limited by the process level, and the shape of a sharp corner cannot be ensured, so that according to the actual process level, a proper fillet is designed to facilitate the processing and the manufacturing, especially a small-sized cylindrical mirror array.
The alternate adjacent arrangement of the plurality of first cylindrical mirror units 101 and the plurality of second cylindrical mirror units 102 forms a cylindrical mirror array in which the first optical surface S1 meets and is periodically arranged with the third optical surface S3, and the second optical surface S2 meets and is periodically arranged with the fourth optical surface S4. With reference to fig. 1 and fig. 2b, when designing a conventional cylindrical mirror, the same cylindrical mirror units are arranged into a cylindrical mirror array, and particularly when a large-angle light distribution requirement is met, a sharp angle is formed at the joint of two cylindrical mirror units, which is difficult to accurately process, and a fillet is generated during the processing process, so that the actual result and the design result are inconsistent, and thus the quality cannot be guaranteed; the embodiment is designed in a partitioned manner aiming at the existing problems, the sharp corner area is designed into the second cylindrical lens unit 102, and the fillet processing is adopted, so that the surface shape quality of the cylindrical lens array is more friendly, and the same uniform illumination effect is realized.
After the sharp corners are removed, in order to achieve the same uniform illumination effect, the bending degree of the cylindrical mirror array needs to be increased, in this embodiment, on the basis of the partition design, the first cylindrical mirror unit 101 and the second cylindrical mirror unit 102 are independently designed, and then the surface type parameter of the first cylindrical mirror unit 101 is adjusted according to the surface type parameter of the second cylindrical mirror unit 102, so as to achieve the same uniform illumination effect. As will be further described below.
In summary, the present invention focuses on solving the surface shape processing problem and the light distribution requirement of the cylindrical lens array, and the cylindrical lens array is periodically arranged by the plurality of first cylindrical lens units 101 and the plurality of second cylindrical lens units 102, so that no sharp corner is generated, the fillet processing is more friendly, and the surface shape quality can be ensured.
With continued reference to FIG. 2b, the generatrix of the cylindrical mirror array is formed by the array of convex and concave curves, the projected length of the convex curve in the vertical plane of the cylindrical mirror array (the plane perpendicular to the paper) being greater than the projected length of the concave curve. In this embodiment, the first cylindrical mirror unit 101 is formed by a convex curve sweep, and the second cylindrical mirror unit 102 is formed by a concave curve sweep, where the projection length of the convex curve is greater than that of the concave curve, which is different from the conventional symmetrical wavy cylindrical mirror and can meet the design requirement of uniform light.
According to a preferred embodiment of the invention, wherein the slope of the convex curve at the intersection with the concave curve is equal. For example, in design, the convex and concave curves are governed by a curve equation, with the convex and concave curves being tangent at the intersection, thereby forming a smooth generatrix when combined, which is easier to manufacture than existing designs with transition regions, and with the convex and concave curves having distinct characteristic conditions and proportionality relationships, as described further below.
According to a preferred embodiment of the present invention, wherein the ratio of the projected length of the convex curve to the projected length of the concave curve is equal to or greater than 3. In the conventional design of a cylindrical mirror array, only the design of a single cylindrical mirror unit is usually considered, and then a plurality of same cylindrical mirror units are directly arranged to form an array, or are arranged in a simple rotational symmetry manner to form an array. The design can meet the manufacturing requirement of a light distribution angle with a small angle, but when the light distribution is required with a large angle, as shown in figure 1, the intersection position of two cylindrical mirrors has large-angle inclination, and simultaneously, a sharp angle also appears. Therefore, in the preferred embodiment, for the requirement of large-angle light distribution, the ratio of the projection length of the convex curve to the projection length of the concave curve is designed to be greater than or equal to 3, which not only meets the requirement of mold processing, but also can meet the design requirement of light uniformization.
According to a preferred embodiment of the present invention, the angular range of the outgoing light from the cylindrical mirror array is equal to or greater than 100 °, and the angular range of the outgoing light is the full-width angle of the maximum light intensity. Within the angle range of more than or equal to 100 degrees, the interior of the cylindrical mirror array can not generate strong total reflection, and the large-angle light distribution design can be realized.
According to a preferred embodiment of the present invention, the angle of the outgoing light of the cylindrical mirror array is in the range of 100 ° -130 °.
Fig. 3 shows a schematic diagram of a light homogenizing device according to another embodiment of the present invention, the light homogenizing device 200 includes a cylindrical lens array, a generatrix of the cylindrical lens array includes a convex curve and a concave curve, a ratio of a projection length of the convex curve to a projection length of the concave curve is 4:1, further, a fillet of the concave curve is designed to have a radius of 0.15mm in consideration of a practical processing condition, a material of the cylindrical lens is PMMA (polymethyl methacrylate, also called acrylic acid or organic glass), a light source emits collimated light, and emergent light of the collimated light after passing through the cylindrical lens array is received by a projection screen. Through simulation optimization by optical software, an angle light intensity distribution curve can be obtained, as shown in fig. 4, the maximum value of the angle light intensity is within ± 62 °, that is, the angle range of the emergent light is 124 °. Fig. 5 is a schematic diagram showing a comparison between the illumination effect and the illumination distribution curve on the projection screen, and it can be seen from the diagram that under the requirement of large-angle light distribution, collimated light passes through the cylindrical lens array to generate a uniform illumination effect.
According to a preferred embodiment of the present invention, the convex curve is an axisymmetric curve, and the slope of the curve on both sides of the axis of symmetry thereof changes continuously monotonously.
According to a preferred embodiment of the present invention, the concave curve is an axisymmetric curve, and the slope of the curve on both sides of the symmetry axis thereof changes continuously monotonously.
According to a preferred embodiment of the invention, wherein the slope of the convex curve and the slope of the concave curve are greatest at the intersection.
FIGS. 6a and 6b are diagrams of convex and concave curves projected on a Y-axis Z-axis plane, wherein the half width of the convex curve in the Y-axis direction is LA, and the derivative of the convex curve passing through the origin at the vertex through the origin is monotonically decreasing in the interval [ -LA,0] and monotonically increasing in the interval [0, LA ]; the half width of the concave curve in the Y-axis direction is LB, and for the concave curve adjacent to the convex curve whose vertex passes through the origin, the derivative thereof in the interval [ LA, LA + LB ] decreases monotonically, and the derivative thereof in the interval [ LA + LB, LA +2LB ] increases monotonically. At the intersection point D of the convex curve and the concave curve, the slope of the convex curve monotonically increases to a maximum value, the slope of the concave curve monotonically decreases from the maximum value, and the maximum value of the slope of the convex curve is equal to the maximum value of the slope of the concave curve, so that the convex curve and the concave curve are arranged and combined to form a smooth bus.
According to a preferred embodiment of the invention, wherein the convex curve has a vertex, the perpendicular to the vertex being parallel to the direction of the incident light; the concave curve has a vertex whose perpendicular is parallel to the direction of the incident light. Referring to fig. 3, the convex curve and the concave curve each have a vertex, and are located on the side of the cylindrical mirror array facing the incident light, and the perpendicular to the vertex is parallel to the paper surface. The light source emits collimated light, and when the collimated light is projected to the cylindrical mirror array, the incident direction of the collimated light is parallel to the vertical line of the vertex, so that the uniform lighting effect is achieved, and the emergent light angle is maximized. The light beam emitted by the light source is not limited, for example, the light source can also emit approximate collimated light, and the vertical direction of the vertex of the convex curve and the vertical direction of the vertex of the concave curve are approximately parallel to the approximate collimated light; also for example, the light source emits diffused light, and a collimating lens may be disposed between the light source and the cylindrical mirror array to collimate the diffused light, which are within the scope of the present invention.
According to a preferred embodiment of the invention, the curve equation of the convex curve is a polynomial equation curve or a bezier curve or a free curve and the curve equation of the concave curve is a polynomial equation curve or a bezier curve or a free curve. In the simulation design, the convex curve and the concave curve are respectively controlled by a curve equation, the convex curve and the concave curve are both Bezier curves or are both free curves, and as long as the design requirements of the convex curve and the concave curve of the preferred embodiment are met, the invention can realize the effects of avoiding sharp corners, being easy to process and being uniform in illumination. The present invention also provides a form of curvilinear expression, as described further below.
According to a preferred embodiment of the invention, the curve equation Z of the convex curve is A Satisfy for the polynomial equation curve:
curve equation Z of concave curve B Satisfy for the polynomial equation curve:
Z B ＝Z A (LA)-Z B0 (LA)+Z B0 ,Y∈[LA,LA+2LB]
Z A ′(LA)＝Z B ′(LA)
wherein, C A Is the curvature of the convex curve, K A Is the conic coefficient of the convex curve, C B Is the curvature of the concave curve, K B Is the conic coefficient of the concave curve. The polynomial curve equation shows the characteristic conditions and the proportional relation of the convex curve and the concave curve on the YZ plane, the curvature change of the concave curve is controlled according to the curve equation to form the effect of fillet treatment, and then the corresponding parameters of the convex curve are adjusted, so that the uniform light effect is realized.
In summary, the present invention improves the design of the cylindrical mirror array based on the design of the cylindrical mirror units to better adapt to the manufacturing process. The specific expression is in carrying out subregion design and adjustment to the face type of cylindrical mirror array, for satisfying the needs of mould processing, earlier through the curvature change of control concave curve, satisfy the mould processing to the requirement of closed angle, carry out corresponding parameter's adjustment design to convex curve again, realize the ascending even illumination of a side to manufacturability has been promoted and the same even light effect has been realized.
The present invention also provides a projector comprising:
a light source for generating a light beam; and
according to the dodging device, the light intensity of the light beam passing through the dodging device in the emergent light direction is uniformly distributed.
According to a preferred embodiment of the invention, the projector further comprises:
and the collimating lens is arranged between the light source and the light homogenizing device and is used for projecting the light beam to the light homogenizing device after being collimated.
The present invention further provides a design method of the light uniformizing device, and fig. 7 shows a flow chart of the design method of the light uniformizing device according to an embodiment of the present invention, which is combined with fig. 2a and fig. 2b, and the design method includes:
at step S10: designing a plurality of first cylindrical mirror units 101, wherein the first cylindrical mirror units 101 include a first optical surface S1 and a second optical surface S2, the first optical surface S1 is formed by a convex curve swept along a vertical plane of the first cylindrical mirror unit 101, the second optical surface S2 is a plane;
at step S20: designing a plurality of second cylindrical lens units 102, wherein the second cylindrical lens units 102 comprise a third optical surface S3 and a fourth optical surface S4, the third optical surface S3 is formed by a concave curve swept along a vertical plane of the second cylindrical lens unit 102, and the fourth optical surface S4 is a plane, wherein a fillet radius of the concave curve meets process requirements of a machining and production process;
at step S30: arranging the first cylindrical mirror units 101 and the second cylindrical mirror units 102 alternately and adjacently to form a cylindrical mirror array, wherein a generatrix of the cylindrical mirror array is formed by the convex curve and the concave curve through an array, and the projection length of the convex curve on a vertical plane of the cylindrical mirror array is greater than that of the concave curve;
at step S40: and adjusting parameters of the convex curve according to the parameters of the concave curve so as to enable the light intensity in the emergent light direction to be uniformly distributed.
According to a preferred embodiment of the invention, wherein the slope of the convex curve at the intersection with the concave curve is equal.
According to a preferred embodiment of the present invention, wherein a ratio of a projected length of the convex curve to a projected length of the concave curve is 3 or more.
According to a preferred embodiment of the present invention, the convex curve is an axisymmetric curve, and the slope of the curve on both sides of the symmetry axis thereof changes continuously monotonously.
According to a preferred embodiment of the present invention, the concave curve is an axisymmetric curve, and the slope of the curve on both sides of the symmetry axis thereof changes continuously monotonously.
According to a preferred embodiment of the invention, wherein the slope of the convex curve and the slope of the concave curve are greatest at the intersection.
According to a preferred embodiment of the invention, wherein said convex curve has a vertex, the perpendicular to which is parallel to the direction of the incident light; the concave curve has a vertex whose perpendicular to the incident light direction is parallel.
According to a preferred embodiment of the present invention, the angular range of the outgoing light from the cylindrical mirror array is greater than or equal to 100 °, and the angular range of the outgoing light is the full-width angle of the maximum light intensity.
According to a preferred embodiment of the present invention, the angle of the outgoing light of the cylindrical mirror array is in the range of 100-130 °.
According to a preferred embodiment of the invention, the curve equation of the convex curve is a polynomial equation curve or a bezier curve or a free curve, and the curve equation of the concave curve is a polynomial equation curve or a bezier curve or a free curve.
According to the inventionA preferred embodiment wherein the curve equation Z of said convex curve A Satisfy for the polynomial equation curve:
curve equation Z of the concave curve B Satisfy for the polynomial equation curve:
Z B ＝Z A (LA)-Z B0 (LA)+Z B0 ,Y∈[LA,LA+2LB]
Z A ′(LA)＝Z B ′(LA)
wherein, C A Is the curvature of the convex curve, K A Is the conic coefficient of the convex curve, C B Is the curvature of the concave curve, K B Is the conic coefficient of the concave curve.
In summary, the present invention provides a design method of a light equalizing device, which is based on the design of a cylindrical mirror unit to perform a sectional design and adjustment on the surface shape of a cylindrical mirror array. For satisfying the needs of mould processing, earlier through the curvature change of control concave curve, satisfy the requirement of mould processing to the closed angle, carry out corresponding parameter's adjustment design to convex curve again, realize the ascending even illumination of a side to both manufacturability has been promoted and the same even light effect of realization is again realized.
The present specification provides method steps as described in the examples or flowcharts, but may include more or fewer steps based on routine or non-inventive labor. The order of steps recited in the embodiments is merely one manner of performing the steps in a multitude of orders and does not represent the only order of execution. When implemented in an actual system or apparatus, the methods shown in the embodiments or flowcharts can be executed sequentially or in parallel.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (14)
1. A light unifying apparatus comprising:
a plurality of first cylindrical mirror units including a first optical surface formed by a convex curve swept along a vertical plane of the first cylindrical mirror units and a second optical surface which is a plane; and
a plurality of second cylindrical lens units, each second cylindrical lens unit comprising a third optical surface and a fourth optical surface, the third optical surface being formed by a concave curve swept along a vertical plane of the second cylindrical lens unit, the fourth optical surface being a plane, wherein a fillet radius of the concave curve meets process requirements of machining and manufacturing;
the first cylindrical mirror units and the second cylindrical mirror units are alternately and adjacently arranged to form a cylindrical mirror array, a bus of the cylindrical mirror array is formed by the convex curve and the concave curve through the array, the projection length of the convex curve on a vertical plane of the cylindrical mirror array is larger than that of the concave curve, and the plane of the cylindrical mirror array is formed by the second optical surface and the fourth optical surface through the array.
2. The light unifying apparatus of claim 1, wherein the slope of the convex curve at the intersection with the concave curve is equal.
3. The light unifying apparatus of claim 1, wherein a ratio of a projected length of the convex curve to a projected length of the concave curve is greater than or equal to 3.
4. The dodging device of claim 1, wherein said convex curve is an axisymmetric curve, and the slope of the curve on both sides of the axis of symmetry thereof changes continuously monotonically.
5. The dodging device of claim 1, wherein said concave curve is an axisymmetric curve, and the slope of the curve on both sides of the axis of symmetry thereof varies continuously monotonically.
6. The light unifying apparatus of any one of claims 1-5, wherein a slope of the convex curve and a slope of the concave curve are greatest at an intersection.
7. The light unifying apparatus of any one of claims 1-5, wherein the convex curve has a vertex with a perpendicular to the vertex parallel to the direction of incident light; the concave curve has a vertex whose perpendicular to the incident light direction is parallel.
8. A light unifying apparatus according to any one of claims 1 to 5, wherein the angular range of the emerging light from the cylindrical mirror array is equal to or greater than 100 °, being the full width angle of maximum light intensity.
9. The dodging device of claim 8, wherein an angle of exit light of said cylindrical mirror array is in a range of 100 ° -130 °.
10. The light unifying apparatus according to any one of claims 2 to 5, wherein the curve equation of the convex curve is a polynomial equation curve or a Bezier curve or a free curve, and the curve equation of the concave curve is a polynomial equation curve or a Bezier curve or a free curve.
11. The light unifying apparatus of claim 10, wherein the curve equation Z of the convex curve A Satisfy for the polynomial equation curve:
curve equation Z of the concave curve B Satisfy for the polynomial equation curve:
Z B ＝Z A (LA)-Z B0 (LA)+Z B0 ,Y∈[LA,LA+2LB]
Z A ′(LA)＝Z B ′(LA)
wherein, C A Is the curvature of the convex curve, K A Is the conic coefficient of the convex curve, C B Is the curvature of the concave curve, K B Is the conic coefficient of the concave curve.
12. A projector, comprising:
a light source for generating a light beam; and
the light unifying apparatus according to any one of claims 1 to 11, wherein the light intensity of the light beam in the outgoing light direction is uniformly distributed after passing through the light unifying apparatus.
13. The projector of claim 12, further comprising:
and the collimating lens is arranged between the light source and the light homogenizing device and is used for projecting the light beam to the light homogenizing device after being collimated.
14. A method of designing a light unifying apparatus as claimed in any one of claims 1 to 11 comprising:
s10: designing a plurality of first cylindrical mirror units, wherein the first cylindrical mirror units comprise a first optical surface and a second optical surface, the first optical surface is formed by a convex curve sweeping along a vertical plane of the first cylindrical mirror units, and the second optical surface is a plane;
s20: designing a plurality of second cylindrical lens units, wherein each second cylindrical lens unit comprises a third optical surface and a fourth optical surface, the third optical surface is formed by sweeping a concave curve along a vertical plane of the second cylindrical lens unit, and the fourth optical surface is a plane, wherein the fillet radius of the concave curve meets the process requirements of the machining and production processes;
s30: the first cylindrical mirror units and the second cylindrical mirror units are alternately and adjacently arranged to form a cylindrical mirror array, a bus of the cylindrical mirror array is formed by the convex curve and the concave curve through the array, and the projection length of the convex curve on the vertical plane of the cylindrical mirror array is greater than that of the concave curve;
s40: and adjusting parameters of the convex curve according to the parameters of the concave curve so as to enable the light intensity in the emergent light direction to be uniformly distributed.
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