CN210511509U - Lens and optical system - Google Patents
Lens and optical system Download PDFInfo
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- CN210511509U CN210511509U CN201921759224.5U CN201921759224U CN210511509U CN 210511509 U CN210511509 U CN 210511509U CN 201921759224 U CN201921759224 U CN 201921759224U CN 210511509 U CN210511509 U CN 210511509U
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Abstract
The utility model provides a lens and have optical system of this lens, this lens is including installation face, go into the plain noodles, first play plain noodles, second play plain noodles and plane of reflection, the installation face is used for installing lens, the light source chamber has been seted up at the center of installation face, the light source chamber is used for the holding light source, the internal surface in light source chamber is for going into the plain noodles, the installation face is connected to the one end on first play plain noodles, the second play plain noodles is connected to the other end on first play plain noodles, the plane of reflection is used for going out the emergent to first play plain noodles or second play plain noodles from the light reflection of going. The utility model discloses a rationally set up the installation face of lens, go into plain noodles, first play plain noodles, second play plain noodles and the position and the structure of plane of reflection for light can realize that the wide-angle throws and the energy of the projection light in wide-angle edge is sufficient, can satisfy the optical property demand of the industrial application to the big angle of vision of wide-angle.
Description
Technical Field
The utility model belongs to the optics field especially relates to a lens and have optical system of this lens.
Background
Nowadays, the industry is developed more and more, and the requirements for optical systems are also higher and higher. One type of optical system is a wide-angle optical system, which is capable of emitting light at large angles. The wide-angle optical system needs to use a light homogenizing sheet for enabling light to be uniformly emitted.
Currently, a Diffractive Optical element DOE (Diffractive optics) or a Refractive Optical element ROE (Refractive optics) is generally used as a design solution for the wide-angle light homogenizing plate. The DOE scheme is designed based on the diffraction theory of light waves by using computer software and by a semiconductor chip manufacturing process, a step-type or continuous relief structure is generated on a substrate by etching, and transmitted light beams are subjected to phase modulation through a microstructure surface to control light intensity distribution modulation. The ROE scheme constructs a random or periodic micro-lens array on a substrate through injection molding or nano-imprinting, follows the refraction principle of geometric optics, and utilizes an aspheric surface to adjust the space angle of emergent light, so that the uniform light device with expected illumination distribution is obtained.
In both DOE and ROE, the energy of the light ray at a large angle is weak, and the optical performance requirement of the optical system for a large field angle is not met.
SUMMERY OF THE UTILITY MODEL
An object of the present invention is to provide a lens capable of solving the above problems and an optical system including the lens.
The utility model provides a following technical scheme:
in a first aspect, the present invention provides a lens, which includes a mounting surface, a light incident surface, a first light emitting surface, a second light emitting surface, and a reflecting surface; the mounting surface is arranged on one side of the lens close to the light source and used for mounting the lens; the lens is provided with a light source cavity in the center of the mounting surface, and the light source cavity is used for accommodating the light source; the inner surface of the light source cavity is the light incident surface; the first light-emitting surface and the second light-emitting surface are curved surfaces which are arranged on the lens and far away from the light source; in a first direction, one end of the first light emitting surface is connected with the mounting surface, the other end of the first light emitting surface is connected with the second light emitting surface, the first light emitting surface and the second light emitting surface are intersected to form a first intersection line, the first intersection line is a straight line and extends along a second direction, the second light emitting surface and the first light emitting surface are in mirror symmetry relative to a plane passing through the first intersection line and perpendicular to the mounting surface, and the first direction is perpendicular to the second direction; in the second direction, the two opposite sides of the lens are respectively formed by inwards recessing, and the reflecting surface is used for reflecting the light rays emitted to the reflecting surface from the light incident surface to the first light emitting surface or the second light emitting surface for emitting; the light emitted by the light source enters the lens through the light incident surface, and the light in the lens is emitted through the first light emitting surface or the second light emitting surface, or the light in the lens is emitted through the first light emitting surface or the second light emitting surface after being reflected by the reflecting surface.
The position and the structure of the installation face, the light incoming face, the first light outgoing face, the second light outgoing face and the reflection face of the lens are reasonably arranged, light rays emitted by the light source pass through the light incoming face and the reflection face refract or reflect to the first light outgoing face and the second light outgoing face, the emergent light rays have larger angles in the first direction, the emergent light rays are converged and collimated in the second direction, the number of the light rays converged in each position is more, the energy of the light rays in a large angle is sufficient, and the requirement of industrial application in the large angle can be met.
The lens further comprises two side faces in the second direction, one end of each side face is connected with the mounting face, the other end of each side face is connected with the first light-emitting face or the second light-emitting face, and the reflecting face is connected with the side faces and the mounting face. Through the reasonable position that sets up the side, first play plain noodles, second play plain noodles, plane of reflection and installation face of lens can cooperate more stably, and the plane of reflection can be protected to the side simultaneously, guarantees that the plane of reflection can be accurate reflection ray.
The first light emitting surface comprises a first surface, a second surface and a third surface which are sequentially connected, the first surface is connected with the second light emitting surface, the third surface is connected with the mounting surface, the second surface is a curved surface, the distance between any point on the first surface and the mounting surface is a first distance, the distance between any point on the first intersection line and the mounting surface is a second distance, and the first distance is not smaller than the second distance, so that the intersecting position of the first light emitting surface and the second light emitting surface is a plane or forms a recess. The intersection position of the first light-emitting surface and the second light-emitting surface is a plane or a concave, so that the light is refracted at the first surface and emitted to a larger angle, and the light with a large angle is sufficient.
On any cross section in the second direction, the position of the light source in the light source cavity projected along the second direction is used as a circle center, a connecting line of an end point of the first surface far away from the first intersecting line and the circle center is a first straight line, a connecting line of a point of the first intersecting line and the circle center is a second straight line, an included angle between the first straight line and the second straight line is a first included angle, and the first included angle is smaller than or equal to 5 degrees. The first included angle is set, so that the range of a plane or a sunken area at the intersection position of the first light-emitting surface and the second light-emitting surface is adjusted, the light at the center and the light at the edge are distributed more uniformly, and the light intensity in a large-angle direction is enhanced.
The second surface is a cylindrical surface, and a first tangent of any point on the second surface is perpendicular to a connecting line from the circle center to the any point. Through setting up the second face for the face of cylinder for light is refracted and can be to bigger angle outgoing at second face department, thereby makes the light distribution of outgoing more sufficient.
On any cross section in the second direction, a connecting line between an end point of the second surface far away from the first surface and the circle center is a third straight line, an included angle between the third straight line and the second straight line is a second included angle, and the range of the second included angle is 40-75 degrees. Through the angle of rationally setting up the second contained angle, guaranteeing under the sufficient prerequisite of wide-angle light, having restricted the scope of light in wide-angle direction, avoid wide-angle light too dispersed, influence the intensity of wide-angle light
The reflecting surface is a curved surface and comprises a first reflecting surface and a second reflecting surface which are symmetrically arranged relative to a plane passing through the center of the mounting surface and perpendicular to the first intersection line, the first reflecting surface, the second reflecting surface, the mounting surface and the first intersection line form a trapezoidal shape on the cross section passing through the first intersection line in the first direction, the end point of the first reflecting surface and the side surface, which is connected with the side surface, is superposed with the end points at the two ends of the first intersection line, the connecting line of the two end points of the first reflecting surface and the mounting surface, which is connected with the second reflecting surface, is a fourth straight line, and the length of the first intersection line is greater than that of the fourth straight line. The first reflecting surface, the second reflecting surface, the mounting surface and the side surface are reasonably arranged, so that light can be favorably converged to the first light emitting surface and the second light emitting surface to be emitted, and the utilization efficiency of the light is improved.
Wherein, on the cross section of the first direction passing through the first intersection line, the contour line of the first reflecting surface is a straight line or a curve, and the contour line forms the first reflecting surface by scanning along the rotating shaft. Through the reflecting surface that sets up the scanning and form for the scope that the reflecting surface assembles light is bigger, is favorable to the make full use of light, avoids the scattering to lead to energy loss.
Wherein, in the second direction, the reflective surface satisfies a condition: theta2＝(90°+θ1) 2 +/-5 degrees; wherein theta is2The included angle between a second tangent at a certain point S of the reflecting surface and the mounting surface is shown; theta1An included angle between a first connecting line and the mounting surface is formed, and the first connecting line is a connecting line between the S point and the center of the light source; theta1Passing through the center of the light source and parallel to the center of the light sourceAnd the straight line of the first intersection line is an x-axis, and the straight line vertical to the x-axis is a y-axis on a two-dimensional coordinate system, and the two-dimensional coordinate system meets the following conditions: theta1Tan-1(H01/W01), wherein the coordinates of the S point are S (H01, W01). By setting the conditional expressions, the structure of the reflection surface is adjusted, so that the reflection surface can accurately reflect the light rays emitted from the light incident surface to the first light emitting surface or the second light emitting surface, the loss caused by the fact that the light rays cannot be reflected to the first light emitting surface or the second light emitting surface is avoided, and the energy utilization rate is improved.
The light incident surface comprises a first light incident surface, a second light incident surface and a third light incident surface, the first light incident surface is opposite to the surface of the mounting surface, the second light incident surface is opposite to the third light incident surface and is connected between the first light incident surface and the mounting surface, the contour line of the first light incident surface is semicircular and is arranged in the first direction, and two ends of the first light incident surface are respectively connected with the mounting surface. The light rays are refracted to the reflecting surface, the first light emitting surface and the second light emitting surface through the cooperation of the first light incident surface, the second light incident surface and the third light incident surface, so that the light rays are converged by the reflecting surface, and the light rays are emitted from the first light emitting surface and the second light emitting surface at an expanded angle.
On the cross section of the first direction, the contour line of the first light incident surface is a curve, and the middle of the first light incident surface faces away from one side of the mounting surface and protrudes. By adopting the structure of the first light incident surface, the first light incident surface converges light rays in the second direction, and the light rays are prevented from being excessively dispersed in the second direction.
Wherein, the first light incident surface satisfies the condition: (d/2) < R < (d/2) > 1.1; k is-2.2 to-2.5; wherein d is the closest distance from the center of the light source to the first light incident surface, K is the aspheric coefficient of the first light incident surface, R is the curvature radius of the first light incident surface, and R and K satisfy the design formula of the aspheric lens. By setting the above conditional expressions, the structure of the first light incident surface is adjusted, so that the first light incident surface can smoothly irradiate the light emitted by the light source to the first light emergent surface or the second light emergent surface, and meanwhile, the light can be uniformly distributed on the first light emergent surface and the second light emergent surface.
In a second aspect, the present invention provides an optical system comprising a light source and the lens of the first aspect, wherein the light source is disposed in a light source cavity of the lens. By adding the lens, the light energy can be reasonably distributed in an optical system, and the large-angle industrial application is met.
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 embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic perspective view of a lens according to an embodiment of the present application.
FIG. 2 is a schematic diagram of the operation of an optical system according to an embodiment of the present application.
Fig. 3 is a schematic diagram of the operation of a conventional optical system using either DOE or ROE design.
FIG. 4 is a top view of a lens in an embodiment of the present application.
Fig. 5 is a sectional view taken along the direction a-a of fig. 4.
FIG. 6 is a bottom view of a lens in one embodiment of the present application.
FIG. 7 is a perspective view of another perspective view of a lens according to an embodiment of the present application.
FIG. 8 is a front view of a lens in one embodiment of the present application.
Fig. 9 is a sectional view taken along the direction C-C of fig. 8.
FIG. 10 is a schematic view of a lens structure with different second angles according to an embodiment of the present application.
FIG. 11 is a schematic view of a three-dimensional scan of a lens according to an embodiment of the present application.
FIG. 12 is a schematic view of a light path of an optical system according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
The embodiment of the utility model provides an optical system, this optical system can be applied to the video and the picture at terminal and acquire, and optical system can be for some of products such as cell-phone, game machine, computer, projecting apparatus and camera. Optical system includes the light source and the embodiment of the utility model provides a lens, lens have the light source chamber, and the light source setting is in the light source intracavity. The light source may be an LED or other light emitting element. The lens has the function of enabling the light rays emitted by the light source to have a larger emergent angle, so that the optical system meets the optical performance requirement of the industry on a large visual angle.
Referring to fig. 1 to 7, a lens according to an embodiment of the present invention includes an installation surface 6, a first light emitting surface 1, a second light emitting surface 2, a reflection surface 3, a side surface 4, and a light incident surface 5. The lens may be a transparent material, such as made of plastic or glass. The plastic may be PMMA (polymethyl methacrylate), PC (polycarbonate), or silicone, etc.
Referring to fig. 2 and 5, the mounting surface 6 is disposed on a side of the lens 100 close to the light source 200 for mounting the lens 100, and the mounting surface 6 is a plane or a curved surface according to an object to which the lens is mounted. The object is, for example, a Printed Circuit Board (PCB). For example, if mounted on a convex surface, the mounting surface 6 is a concave surface; if the mounting surface is installed on the concave surface, the mounting surface 6 is a convex surface; if mounted on a flat surface, the mounting surface 6 is a flat surface. The utility model discloses do not restrict the concrete shape of installation face 6. The center of installation face 6 has seted up light source cavity 50, and light source cavity 50 is used for holding light source 200, and the internal surface in light source cavity 50 is into plain noodles 5. Through the reasonable arrangement of the positions of the light source 200, the mounting surface 6 and the light incident surface 5, light rays emitted by the light source 200 can better enter the lens 100 through the light incident surface 5, and the energy loss of the light rays is reduced.
Referring to FIG. 1, a first direction and a second direction are first defined, the first direction is the x-axis direction of the coordinate axes of FIG. 1, and the second direction is the y-axis direction of the coordinate axes. In the first direction described herein, i.e. viewed along the y-axis, the line of sight is perpendicular to the x-axis, and a plane parallel to the x-axis is seen. In a cross-section in a first direction as described herein, i.e. viewed along the x-axis, the line of sight is parallel to the x-axis and is seen in a plane perpendicular to the x-axis. In the second direction described herein, i.e. viewed along the x-axis, the line of sight is perpendicular to the y-axis, and a plane parallel to the y-axis is seen. In the cross-section described herein in the second direction, i.e. viewed along the y-axis, the line of sight is parallel to the y-axis, and is seen in a plane perpendicular to the y-axis. As defined above, the first direction and the second direction are perpendicular.
Referring to fig. 1, fig. 4 and fig. 5, the first light emitting surface 1 and the second light emitting surface 2 are curved surfaces disposed on the lens 100 away from the light source 200. In the first direction, one end of the first light emitting surface 1 is connected to the mounting surface 6, the other end of the first light emitting surface 1 is connected to the second light emitting surface 2, and at this time, one end of the second light emitting surface 2, which is far away from the first light emitting surface 1, is also connected to the mounting surface 6. The first light emitting surface 1 and the second light emitting surface 2 intersect to form a first intersection line 91, the first intersection line 91 is a straight line, the first intersection line 91 extends along the second direction, and the second light emitting surface 2 and the first light emitting surface 1 are mirror-symmetric with respect to a plane passing through the first intersection line 91 and perpendicular to the mounting surface 6 (if the mounting surface 6 is a curved surface, please refer to fig. 9, the first light emitting surface 1 and the second light emitting surface 2 are mirror-symmetric with respect to a yoz plane of a coordinate system). In a cross section in the second direction, the first light exit surface 1 and the second light exit surface 2 have a convex lens sectional shape with respect to the mounting surface 6. After propagating in the lens 100, the light emitted from the light source 200 exits from the first light emitting surface 1 and the second light emitting surface 2, and the light exits from the first light emitting surface 1 and the second light emitting surface 2 at a large angle.
Referring to fig. 1 and 7, the reflection surface 3 is connected to the side surface 4 and the mounting surface 6, the reflection surface 3 is conical and concave relative to the side surface 4, and the reflection surface 3 is used for reflecting the light emitted by the light source 200 and emitted to the reflection surface 3 through the light incident surface 5 to the first light emitting surface 1 or the second light emitting surface 2 for emitting. In particular, the surface of the reflecting surface 3 is generally coated with a reflective coating to perform the reflecting function. Wherein the reflecting surface 3 comprises a first reflecting surface 31 and a second reflecting surface 32. Assuming that the first plane is a plane perpendicular to the second direction and passing through the midpoint of the first intersection line 91, the first reflecting surface 31 and the second reflecting surface 32 are symmetrical with respect to the first plane. The first reflecting surface 31 and the second reflecting surface 32 adopt a symmetrical structure, so that the light energy reflected by the reflecting surface 3 to the first light emitting surface 1 and the second light emitting surface 2 in the first direction is the same, which is beneficial to better distribute the light energy to the first light emitting surface 1 and the second light emitting surface 2. The light emitted from the light source 200 enters the lens 100 through the light incident surface 5, and the light in the lens 100 is emitted through the first light emitting surface 1 or the second light emitting surface 2, or the light in the lens 100 is emitted through the first light emitting surface 1 or the second light emitting surface 2 after being reflected by the reflecting surface 3.
The reasonable installation face 6 that sets up lens, go into plain noodles 5, first play plain noodles 1, the position and the structure of second play plain noodles 2 and plane of reflection 3, the light that light source 200 sent is through going into plain noodles 5 and plane of reflection 3 refraction or reflection to first play plain noodles 1 and the emergent exit of second play plain noodles 2, in the first direction, the light of outgoing has bigger angle, in the second direction, the light of outgoing is assembled the collimation, the quantity that light assembles in each position is more, make light energy at large angle sufficient, can satisfy the demand of the industrial application of large angle.
Referring to fig. 1 and 7, the lens 100 has two side surfaces 4, one end of the side surface 4 is connected to the mounting surface 6, and the other end is connected to the first light emitting surface 1 or the second light emitting surface 2. In a cross section of the first intersection line 91 in the first direction, end points where the first reflecting surface 31 and the second reflecting surface 32 meet the side surface 4 coincide with the first intersection line 91. Through the reasonable position that sets up side 4, first play plain noodles 1, second play plain noodles 2, plane of reflection 3 and installation face 6 of lens 100 can cooperate more stably, and side 4 can protect plane of reflection 3 simultaneously, guarantees that plane of reflection 3 can be accurate reflection light.
Referring to fig. 2 and 3, fig. 2 is a schematic diagram illustrating an operation of an optical system formed by the light source 200 and the lens 100 of the present application, and fig. 3 is a schematic diagram illustrating an operation of an optical system of a conventional DOE or ROE structure. The reference numeral 500 denotes an MLA lens or other conventional optical lenses, and 100 denotes a lens according to the present invention, and it is apparent that the field angle of the optical system of fig. 2 is significantly larger than that of the optical system of fig. 3, and the light beam emission range is wider.
Referring to fig. 8, the first light emitting surface 1 includes a first surface 11, a second surface 12 and a third surface 13 connected in sequence, the first surface 11 is connected to the second light emitting surface 2, and the third surface 13 is connected to the mounting surface 6. The second face 12 is the arc surface, and the light source 200 center in the light source cavity is first position, and the projected position of first position along the second direction is centre of a circle O, the last extreme point B of keeping away from first face 11 of second face 12, and its first tangent line 92 is perpendicular with OB, is the arc surface through setting up second face 12 for light is refraction and can be to bigger angle outgoing in second face 12 department, thereby makes the light distribution of outgoing more sufficient. A second angle 72 between the third straight line OB and the second straight line OM satisfies the condition: the second included angle is more than or equal to 40 degrees and less than or equal to 75 degrees and 72 degrees. Referring to fig. 10, when the second included angle 81 is 43 °, a wide-angle 100 ° lens can be manufactured; when the second included angle 82 is 59 degrees, a wide-angle 120-degree lens can be manufactured; when the second included angle 83 is 72 °, a wide-angle 140 ° lens can be manufactured. The second included angle 72 may be as low as 40 ° in the case where it is desired to make the angle of view slightly smaller than the wide angle of 100 °, and as high as 75 ° in the case where it is desired to make the angle of view slightly larger than the wide angle of 140 °. Through the angle of rationally setting up second contained angle 72, guaranteeing under the sufficient prerequisite of wide-angle light, restricted light in the scope of wide-angle direction, avoid wide-angle light too dispersed, influence the intensity of wide-angle light.
Referring to fig. 8, a distance between any point H on the first surface 11 and a perpendicular line of the mounting surface is a first distance HT, a distance between any point M on the first intersection 91 and the perpendicular line of the mounting surface is a second distance OM, and the first distance HT is greater than or equal to the second distance OM. A point a on a boundary line between the first surface 11 and the second surface 12, a point M of the first intersection line 91, and a first angle 71 between the first straight line OA and the second straight line OM satisfy the condition: 0 ° < first angle 71 ≦ 5 ° (when first angle 71 ≦ 0 °, first face 11 does not exist), for example: the first included angle 71 may be 1 °, 2 °, 3 °, 4 °, 4.5 °, 5 °, etc. The first light emitting surface 1 is planar or recessed within this range (i.e., the range of the first surface 11). By arranging the intersecting position (i.e. the first surface 11) of the first light emitting surface 1 and the second light emitting surface 2 to be a plane or a concave, the light is refracted at the first surface 11 and emitted to a larger angle, so that the light with a large angle is sufficient.
Since the first light emitting surface 1 and the second light emitting surface 2 are symmetrical about the first intersection line 91, the same position of the second light emitting surface 2 is also a plane or a concave. The symmetrical concave positions can enable the light rays emitted by the light source 200 to emit towards a larger angle; and the symmetrical planar positions cause the light emitted from the light source 200 to exit toward the original angle. The extent of the concavity of the first face 11 and the extent of the concavity of the first face 11 (i.e., the value of the first included angle 71) may vary depending on the application requirements. For example, when the application is slightly more demanding for high angle light energy, the first included angle 71 may be 4.5 ° or even 5 °, and the degree of concavity may be increased appropriately; conversely, when applied to a slightly lower energy requirement for high angle light, the first included angle 71 may be reduced in angle, the degree of concavity may be reduced, or the first face 11 may be flat. The first included angle is set, so that the range of a plane or a recessed area at the intersection position of the first light incident surface and the second light incident surface is adjusted, the light rays at the center and the light rays at the edges are distributed more uniformly, and the light ray intensity in the large-angle direction is enhanced.
Referring to fig. 1, 9 and 11, the reflection surface 3 includes a first reflection surface 31 and a second reflection surface 32 symmetrically disposed with respect to a plane passing through the center of the mounting surface and perpendicular to the first intersection line (see fig. 8, which is the xoz plane of the coordinate system in fig. 8). On a cross section of a first intersection line 91 in the first direction, the first reflecting surface 31, the second reflecting surface 32, the mounting surface 6 and the first intersection line 91 form a trapezoid shape, end points of the first reflecting surface 31 and the second reflecting surface 32, which are connected with the side surface 4 in the direction towards the first intersection line 91, coincide with end points of two ends of the first intersection line 91, a connecting line of the two end points of the first reflecting surface 31 and the second reflecting surface 32, which are connected with the mounting surface 6, is a fourth straight line JK, and the length of the first intersection line 91 is greater than that of the fourth straight line JK. By reasonably setting the position relationship among the first reflecting surface 31, the second reflecting surface 32, the mounting surface 6 and the side surface 4, the light can be favorably converged to the first light emitting surface 1 and the second light emitting surface 2 to be emitted, and the utilization efficiency of the light is improved.
Referring to fig. 7 and 11, the line passing through the center O in the second direction is taken as the rotation axis 94, and the contour 95 of the reflective surface 3 is formed by scanning along the rotation axis 94. Since the reflection surface 3 is formed by rotating and scanning along the rotating shaft 94 on the mounting surface 6, the reflection effect of the reflection surface 3 on the light in the first direction is the same, which is beneficial for the first light emitting surface 1 and the second light emitting surface 2 to distribute the light reflected by the reflection surface 3 reasonably and meeting the industrial requirements. The contour line of scanning can be adjusted according to the concrete structure of lens, on first direction and the cross section through first intersect 91, the light uniformity is higher when the contour line is the straight line, and when the contour line is the curve, light concentration is higher. Through the reflecting surface 3 that sets up the scanning and form for the scope that reflecting surface 3 assembles light is bigger, is favorable to the make full use of light, avoids the scattering to lead to energy loss.
The reflection surface 3 includes a plurality of tiny arc units, and the arc units reflect the light passing through the second light incident surface 52 or the third light incident surface 53 to the first light emitting surface 1 or the second light emitting surface 2. In the second direction, U is a point on the mounting surface 6, O is the light source center, and the reflecting surface 3 satisfies the condition: an angle θ 2 between the second tangent 93 at a certain point S and the horizontal direction satisfies, on a coordinate system of the plane with the first position as an origin O, OU as an x-axis and the OI as a y-axis:
wherein theta is1Is the included angle between the first connecting line SO and the mounting surface 6, and the first connecting line SO is the connecting line between the S point and the light source center O;
When the contour line 95 is a straight line, θ 2 is a fixed value (irrespective of the position of the s-point on the reflecting surface 3); when the contour 95 is a curve, θ 2 is a variable value (which varies with the position of the point s). By setting the above conditional expressions, the structure of the reflection surface 3 is adjusted, so that the reflection surface 3 can accurately reflect the light rays emitted from the light incident surface 5 to the first light emitting surface 1 or the second light emitting surface 2, thereby preventing the light rays from being lost due to the fact that the light rays cannot be reflected to the first light emitting surface 1 or the second light emitting surface 2, and improving the energy utilization rate.
Referring to fig. 5, 6 and 9, the light incident surface 5 of the lens includes a first light incident surface 51, a second light incident surface 52 and a third light incident surface 53, the first light incident surface 51 is opposite to the surface passing through the mounting surface 6, the second light incident surface 52 and the third light incident surface 53 are oppositely disposed and respectively connected between the first light incident surface 51 and the mounting surface 6, and the first light incident surface 51 is a curved surface. The first light incident surface 51, the second light incident surface 52 and the third light incident surface 53 enclose to form a light source cavity 50, the projection of the light source cavity 50 perpendicular to the mounting surface 6 is rectangular, the position of the light source 200 is at the geometric center of the rectangle, and the light source 200 is flush with the mounting surface 6. The position of the light source 20 is a first position, which is a focal position of the first light incident surface 51. Through the cooperation of the first light incident surface 51, the second light incident surface 52 and the third light incident surface 53, the light rays are refracted to the reflection surface 3, the first light emitting surface 1 and the second light emitting surface 2, so that the reflection surface 3 converges the light rays and the first light emitting surface 1 and the second light emitting surface 2 expand the angle of the emitted light rays.
In the cross section in the second direction, the outline of the first incident surface 51 is semicircular, and in the first direction, two ends of the first incident surface 51 are respectively connected with the mounting surface 6. In the second direction, the first light incident surface 51 is divided into two portions which are mirror-symmetric with respect to the second intersecting line 90. The second incident surface 52 and the third incident surface 53 are mirror-symmetric about the second intersecting line 90, and have a semicircular shape in the first direction. By adopting the structure of the first light incident surface 51, the first light incident surface 51 gathers the light rays having the original tendency of divergence to the first light emitting surface 1 and the second light emitting surface 2, so as to provide sufficient light rays for the first light emitting surface 1 and the second light emitting surface 2.
Referring to fig. 9, the first light incident surface 51 satisfies the condition:
(d/2)<R<(d/2)*1.1；
K＝-2.2～-2.5；
where d is the closest distance from the light source center to the first incident surface 51, K is the aspheric coefficient of the first incident surface 51, and R is the radius of curvature of the first incident surface 51.
Wherein R and K satisfy the aspherical lens design formula:
wherein Y is the distance between the end point of the curved surface and the normal of the convex point of the curved surface, and z is the distance between the convex point of the curved surface and the bottom plane where the end point of the curved surface is positioned. By setting the above conditional expressions, the structure of the first light incident surface 51 is adjusted, so that the first light incident surface 51 can smoothly irradiate the light emitted from the light source 100 to the first light emitting surface 1 or the second light emitting surface 2, and meanwhile, the light can be uniformly distributed on the first light emitting surface 1 and the second light emitting surface 2.
In the cross section in the first direction, the contour line of the first incident surface 51 is a curve, and the middle of the first incident surface 51 protrudes toward the side away from the mounting surface 6. By adopting the structure of the first light incident surface, the first light incident surface converges light rays in the second direction, and the light rays are prevented from being excessively dispersed in the second direction.
Referring to fig. 12, the light emitted from the light source 200 has two paths, ① passing through the first light incident surface 51 and exiting from the first light emitting surface 1 or the second light emitting surface 2, ② passing through the second light incident surface 52 or the third light incident surface 53, then being reflected by the reflecting surface 3, and finally exiting from the first light emitting surface 1 or the second light emitting surface 2.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (13)
1. A lens is characterized by comprising a mounting surface, a light incident surface, a first light emergent surface, a second light emergent surface and a reflecting surface;
the mounting surface is arranged on one side of the lens close to the light source and used for mounting the lens;
the lens is provided with a light source cavity in the center of the mounting surface, and the light source cavity is used for accommodating the light source;
the inner surface of the light source cavity is the light incident surface;
the first light-emitting surface and the second light-emitting surface are curved surfaces which are arranged on the lens and far away from the light source; in a first direction, one end of the first light emitting surface is connected with the mounting surface, the other end of the first light emitting surface is connected with the second light emitting surface, the first light emitting surface and the second light emitting surface are intersected to form a first intersection line, the first intersection line is a straight line and extends along a second direction, the second light emitting surface and the first light emitting surface are in mirror symmetry relative to a plane passing through the first intersection line and perpendicular to the mounting surface, and the first direction is perpendicular to the second direction;
in the second direction, the two opposite sides of the lens are respectively formed by inwards recessing, and the reflecting surface is used for reflecting the light rays emitted to the reflecting surface from the light incident surface to the first light emitting surface or the second light emitting surface for emitting;
the light emitted by the light source enters the lens through the light incident surface, and the light in the lens is emitted through the first light emitting surface or the second light emitting surface, or the light in the lens is emitted through the first light emitting surface or the second light emitting surface after being reflected by the reflecting surface.
2. The lens of claim 1, further comprising two side surfaces in the second direction, wherein one end of the side surface is connected to the mounting surface, the other end of the side surface is connected to the first light emitting surface or the second light emitting surface, and the reflective surface is connected to the side surface and the mounting surface.
3. The lens according to claim 1, wherein the first light emitting surface includes a first surface, a second surface and a third surface connected in sequence, the first surface is connected to the second light emitting surface, the third surface is connected to the mounting surface, the second surface is a curved surface, a distance between any point on the first surface and the mounting surface is a first distance, a distance between any point on the first intersecting line and the mounting surface is a second distance, and the first distance is not less than the second distance, so that a position where the first light emitting surface and the second light emitting surface intersect is a plane or a recess is formed.
4. The lens according to claim 3, wherein on any cross section in the second direction, taking a projected position of the light source in the light source cavity along the second direction as a center of a circle, a line connecting an end point of the first surface far from the first intersection line and the center of the circle is a first straight line, a line connecting a point of the first intersection line and the center of the circle is a second straight line, an included angle between the first straight line and the second straight line is a first included angle, and the first included angle is less than or equal to 5 °.
5. The lens of claim 4, wherein the second surface is a cylindrical surface, and a first tangent line at any point on the second surface is perpendicular to a line connecting the center of the circle to the any point.
6. The lens of claim 5, wherein, in any cross section in the second direction, a line connecting an end point of the second surface far from the first surface and the center of the circle is a third straight line, and an included angle between the third straight line and the second straight line is a second included angle, and the second included angle ranges from 40 ° to 75 °.
7. The lens according to claim 2, wherein the reflecting surface is a curved surface, the reflecting surface includes a first reflecting surface and a second reflecting surface which are symmetrically disposed with respect to a plane passing through a center of the mounting surface and perpendicular to the first intersecting line, the first reflecting surface, the second reflecting surface, the mounting surface, and the first intersecting line form a trapezoidal shape in a cross section passing through the first intersecting line in the first direction, and end points of the first reflecting surface and the second reflecting surface which are connected to the side surfaces coincide with end points of both ends of the first intersecting line, a connecting line of the two end points of the first reflecting surface and the second reflecting surface which are connected to the mounting surface is a fourth straight line, and a length of the first intersecting line is longer than a length of the fourth straight line.
8. The lens of claim 7, wherein, in a cross section in the first direction passing through the first intersection line, a contour line of the first reflecting surface is a straight line or a curved line, the contour line forming the first reflecting surface by scanning.
9. The lens of claim 8, wherein in the second direction, the reflective surface satisfies the condition:
θ2＝(90°+θ1)/2±5°；
wherein theta is2The included angle between a second tangent at a certain point S of the reflecting surface and the mounting surface is shown;
θ1an included angle between a first connecting line and the mounting surface is formed, and the first connecting line is a connecting line between the S point and the center of the light source;
θ1and satisfying the following conditions on a two-dimensional coordinate system which takes the light source center as an origin, a straight line passing through the light source center and parallel to the first intersection line as an x-axis and a straight line perpendicular to the x-axis as a y-axis:
θ1tan-1(H01/W01), wherein the coordinates of the S point are S (H01, W01).
10. The lens of claim 1, wherein the light incident surface includes a first light incident surface, a second light incident surface and a third light incident surface, the first light incident surface is opposite to the surface passing through the installation surface, the second light incident surface and the third light incident surface are opposite to each other and are respectively connected between the first light incident surface and the installation surface, the contour line of the first light incident surface is semicircular in the cross section of the second direction, and in the first direction, two ends of the first light incident surface are respectively connected with the installation surface.
11. The lens of claim 10, wherein, in a cross-section in the first direction, a contour line of the first light incident surface is a curve, and a middle portion of the first light incident surface is convex toward a side away from the mounting surface.
12. The lens of claim 11, wherein the first entrance surface satisfies the condition:
(d/2)<R<(d/2)*1.1；K＝-2.2～-2.5；
wherein d is the closest distance from the center of the light source to the first light incident surface, K is the aspheric coefficient of the first light incident surface, R is the curvature radius of the first light incident surface, and R and K satisfy the design formula of the aspheric lens.
13. An optical system comprising a light source and a lens as claimed in any one of claims 1 to 12, the light source being disposed within a light source cavity of the lens.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921759224.5U CN210511509U (en) | 2019-10-18 | 2019-10-18 | Lens and optical system |
| PCT/CN2019/115375 WO2021072822A1 (en) | 2019-10-18 | 2019-11-04 | Lens and optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921759224.5U CN210511509U (en) | 2019-10-18 | 2019-10-18 | Lens and optical system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210511509U true CN210511509U (en) | 2020-05-12 |
Family
ID=70573168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921759224.5U Expired - Fee Related CN210511509U (en) | 2019-10-18 | 2019-10-18 | Lens and optical system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210511509U (en) |
-
2019
- 2019-10-18 CN CN201921759224.5U patent/CN210511509U/en not_active Expired - Fee Related
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Address after: 330096 No.699 Tianxiang North Avenue, Nanchang hi tech Industrial Development Zone, Nanchang City, Jiangxi Province Patentee after: Jiangxi OMS Microelectronics Co.,Ltd. Address before: 330000 east of Xueyuan 6th Road, south of Tianxiang Avenue, Nanchang hi tech Industrial Development Zone, Nanchang City, Jiangxi Province Patentee before: OFilm Microelectronics Technology Co.,Ltd. Address after: 330000 east of Xueyuan 6th Road, south of Tianxiang Avenue, Nanchang hi tech Industrial Development Zone, Nanchang City, Jiangxi Province Patentee after: OFilm Microelectronics Technology Co.,Ltd. Address before: 330013 No.698 Tianxiang Avenue, high tech Zone, Nanchang City, Jiangxi Province Patentee before: NANCHANG OFILM BIO-IDENTIFICATION TECHNOLOGY Co.,Ltd. |
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