CN112524573A - Transmission-type optical module - Google Patents

Transmission-type optical module Download PDF

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Publication number
CN112524573A
CN112524573A CN202011490665.7A CN202011490665A CN112524573A CN 112524573 A CN112524573 A CN 112524573A CN 202011490665 A CN202011490665 A CN 202011490665A CN 112524573 A CN112524573 A CN 112524573A
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Prior art keywords
light
lens
light source
optical module
aspheric
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CN202011490665.7A
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Chinese (zh)
Inventor
卢盛林
曾振煌
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Guangdong OPT Machine Vision Co Ltd
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Guangdong OPT Machine Vision Co Ltd
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Priority to CN202011490665.7A priority Critical patent/CN112524573A/en
Publication of CN112524573A publication Critical patent/CN112524573A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F21V5/045—Refractors for light sources of lens shape the lens having discontinuous faces, e.g. Fresnel lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F21V5/046—Refractors for light sources of lens shape the lens having a rotationally symmetrical shape about an axis for transmitting light in a direction mainly perpendicular to this axis, e.g. ring or annular lens with light source disposed inside the ring

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Lenses (AREA)

Abstract

The invention belongs to the technical field of machine vision and lighting equipment, and particularly relates to a transmission type optical module which comprises a light source and a lens, wherein the lens is arranged in front of the light source and comprises a first surface and a second surface, light rays emitted by the light source sequentially pass through the first surface and the second surface, the first surface is a rotationally symmetrical curved surface, the first surface is used for converging light rays, the second surface is a free curved surface, the optical axis of the second surface is inclined to the optical axis of the first surface, and the second surface is used for changing the emergent angle of the light rays. According to the invention, on the premise of not changing the installation angle of the light source, the change of the emergent angle of the light is realized by arranging the lens in front of the light source, the emergent angle of the light can be adjusted with high precision, and the shaping of the emergent light spot can be realized.

Description

Transmission-type optical module
Technical Field
The invention belongs to the technical field of machine vision and lighting equipment, and particularly relates to a transmission type optical module.
Background
In the field of machine vision and lighting technology, specific light sources are used. Generally speaking, the quality of the illumination of the light source directly affects the quality of the information collected by the machine vision system, and therefore, research on the application of the light source is always important.
However, the inventor has found that in some special machine vision applications, the light emitting angle of a specific light source needs to be adjusted, and the scheme of generally changing the light emitting angle of the light source is to change the angle of the lamp panel, that is, the light emitting direction of the light source is changed by changing the placing angle of the lamp, which has the disadvantage that the whole lamp panel is not a plane due to the change of the angle of the lamp panel, and for the LED lamps in multiple arrays, each lamp panel needs to change a certain angle, which is not beneficial to the batch manufacturing of the PCB panel, and is also not beneficial to the precision control of the angles of each LED lamp and the consistency of the light emitting angle of the LED lamp, so that the requirements of machine vision and illumination can not be well met.
Therefore, a new optical module is needed to solve the above problems.
Disclosure of Invention
The invention aims to: to prior art's not enough, provide a transmission-type optical module, it can be under the prerequisite that does not change the installation angle of light source, realizes the change of the exit angle of light through set up lens before the light source, and it can carry out the adjustment of high accuracy to the exit angle of light, can realize the plastic of emergent facula.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a transmission-type optical module, includes light source and lens, lens set up in the place ahead of light source, lens include first surface and second surface, the light that the light source jetted out passes through in proper order the first surface with the second surface, the first surface is rotational symmetry curved surface, the first surface is used for the convergent light, the second surface is free-form surface, the optical axis of second surface slope in the optical axis of first surface, the second surface is used for changing the exit angle of light.
Furthermore, the included angle between the optical axis of the first surface and the optical axis of the second surface is theta, theta is greater than 0 degree, and the optical axis of the first surface and the optical axis of the second surface form the included angle theta, so that light can be effectively deflected, and therefore shaping of light spots is achieved.
Further, the first surface is a spherical surface, and the first surface protrudes outwards towards the light source.
Further, the first surface is an aspheric surface, and the expression of the aspheric surface profile of the first surface is
Figure BDA0002840601060000021
Where z is the high vector of the aspheric surface, c is the curvature of the aspheric surface, r is the radial coordinate in units of lens length, k, α1～α8Are all aspheric coefficients.
Further, the second surface is a Zernike polynomial free-form surface with the expression of
Figure BDA0002840601060000031
Where z is the vector magnitude of the second surface, the first term to the right of the equal sign is the Conic surface portion, c is the curvature of the second surface, r is the radial coordinate in units of lens length, k is the quadratic aspheric constant, N is the number of polynomial coefficients, A is the number of second order aspheric coefficientsiIs a polynomial coefficient of the i-th term, Ei(x, y) are higher order polynomials of x and y of the i-th term, both of which are variables of the polynomial.
Further, the lens also comprises a third surface and a fourth surface, the first surface, the third surface, the second surface and the fourth surface are sequentially connected, and the third surface and the fourth surface do not prevent light rays from transmitting from the first surface to the second surface.
Further, the number of the light sources and the number of the lenses are both a plurality, the third surface and the fourth surface of each lens are both connecting surfaces, the plurality of lenses are connected, in the adjacent lenses, the fourth surface of one lens is connected to the third surface of the other lens, and the plurality of lenses can form a lens array.
Further, the optical module still includes the PCB board, a plurality of the light source evenly distributed in the PCB board, a plurality of lens evenly distributed in a plurality of the place ahead of light source, and, the light source can be LED light source or COB light source.
The invention has the beneficial effects that: the invention comprises a light source and a lens, wherein the lens is arranged in front of the light source and comprises a first surface and a second surface, light rays emitted by the light source sequentially pass through the first surface and the second surface, the first surface is a rotationally symmetric curved surface and is used for converging light rays, the second surface is a free curved surface with a light path shaping function, the optical axis of the second surface is inclined to the optical axis of the first surface, and the second surface is used for changing the emergent angle of the light rays and can enable the light rays to obtain a better facula effect after being shaped, so that the emergent angle of the light rays is adjusted on the premise of not changing the installation angle of the light source.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.
Fig. 2 is a schematic structural view of a lens according to embodiment 1 of the present invention.
Fig. 3 is a schematic structural diagram of embodiment 2 of the present invention.
Wherein: 1-a light source; 2-a lens; 3-a PCB board; 11-light; 21-a first surface; 22-a second surface; 23-a third surface; 24-a fourth surface; 211 — an optical axis of the first surface; 221 — an optical axis of the second surface; l1 — distance between the center of the light source and the center of the first surface; l2 — distance between the center of the first surface and the center of the second surface; theta-the angle between the optical axis of the first surface and the optical axis of the second surface; angle of deflection of alpha-emergent light.
Detailed Description
As used in this specification and the appended claims, certain terms are used to refer to particular components, and it will be appreciated by those skilled in the art that a manufacturer may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal ", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between 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.
The present invention will be described in further detail with reference to the accompanying drawings 1 to 3 and specific examples, but the present invention is not limited thereto.
Example 1
A transmission-type optical module is disclosed, as shown in FIG. 1, comprising a light source 1 and a lens 2, wherein the lens 2 is disposed in front of the light source 1, the lens 2 comprises a first surface 21 and a second surface 22, and a light ray 11 emitted from the light source 1 sequentially passes through the first surface 21 and the second surface 22, wherein the first surface 21 is a rotationally symmetric curved surface, the first surface 21 protrudes outward toward the light source 1, the second surface 22 is a free curved surface, an optical axis 221 of the second surface is inclined to an optical axis 211 of the first surface, during an emitting process of the light ray 11, the first surface 21 is used for converging the light ray 11, and the second surface 22 is used for changing an emitting angle of the light ray 11.
Further, as shown in fig. 2, the distance between the center of the light source 1 and the center of the first surface 21 is L1, the distance between the center of the first surface 21 and the center of the second surface 22 is L2, and the following relations are satisfied: L1/L2 is more than or equal to 0.545 and less than or equal to 0.546.
Wherein, the distance between the center of the light source 1 and the center of the first surface 21 may be 3mm to 3.1mm, and the distance between the center of the first surface 21 and the center of the second surface 22 may be 5.5mm to 5.6 mm.
Preferably, the optical axis 211 of the first surface and the optical axis 221 of the second surface form an angle θ, and 19 ° ≦ θ ≦ 20 °.
Meanwhile, the first surface 21 is an aspherical surface, and the first surface 21 is an aspherical surface type rotationally symmetric with respect to the optical axis of the lens 2, and its expression is:
Figure BDA0002840601060000061
where z is the rise of the first surface 21, the first term to the right of the equal sign is the Conic surface portion, c is the curvature of the first surface 21, r is the radial coordinate in units of lens length, k, α1～α8Are all aspheric coefficients, and the curvature of the first surface 21 is 0.4965mm-1～0.4975mm-1The aspheric coefficient k of the first surface 21 is-4.497 to-4.496, alpha1～α8All values of (A) are 0.
Preferably, the second surface 22 is a Zernike polynomial free-form surface of the expression Zernike
Figure BDA0002840601060000062
Where z is the rise of second surface 22, the first term to the right of the equal sign is the Conic surface portion, c is the curvature of second surface 22, r is the radial coordinate in units of lens length, k is the quadratic aspheric constant, N is the number of polynomial coefficients, A is the number of second surface 22iIs a polynomial coefficient of the i-th term, Ei(x, y) are higher order polynomials of x and y of the i-th term, both of which are variables of the polynomial.
Preferably, the curvature of the second surface 22 is-0.2782 mm-1～-0.2781mm-1The second aspheric constant k of the second surface 22 is-34.072 to-34.071, the value of N is 3, A1＝-1.1426x10-4，A2＝-1.395，A3＝162.003，A1、A2、A3Corresponding to the three expansion polynomials x, y, xy, respectively, and the first surface 21 and the second surface 22 have a good effect of eliminating aberrations, thereby optimizing the exit effect of the light ray 11.
Preferably, the transmission-type optical module further includes a PCB 3, the light source 1 is disposed on the PCB 3, the light source 1 is an LED light source or a COB light source, and the PCB 3 is used for driving the light source 1 to operate.
Preferably, the lens 2 further comprises a third surface 23 and a fourth surface 24, the first surface 21, the third surface 23, the second surface 22 and the fourth surface 24 are sequentially connected, the third surface 23 is located above the fourth surface 24, and the third surface 23 and the fourth surface 24 do not prevent the light 11 from passing from the first surface 21 to the second surface 22.
Under the adjusting action of the lens 2 on the light rays 11, the value of the deflection angle alpha of the emergent light is 16.5-17.5 degrees, so that the adjusting effect of deflecting the light emergent angle by 16.5-17.5 degrees is realized, and in addition, the light rays 11 are shaped through the first surface 21 and the second surface 22 together, so that the light spots at the position with the working distance of 100mm have high uniformity.
Example 2
As shown in fig. 3, the embodiment is different from embodiment 1 in that the number of the light sources 1 and the number of the lenses 2 are both a plurality of, the third surface 23 and the fourth surface 24 of the lens 2 are connecting surfaces, the plurality of lenses 2 are connected, the plurality of light sources 1 are uniformly distributed on the PCB board 3, and the plurality of lenses 2 are uniformly distributed in front of the plurality of light sources 1, so that each lens 2 and each light source 1 can correspond to each other one by one, thereby forming a light source array and a lens array, and meeting the requirements of large-area detection and illumination.
Other structures of this embodiment are the same as those of embodiment 1, and are not described herein again.
Obviously, the invention has good spot shaping effect on the light source, thereby realizing the high-efficiency adjustment of the emergent angle of the light without changing the installation angle of the light source.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (8)

1. A transmissive optical module, comprising: including light source (1) and lens (2), lens (2) set up in the place ahead of light source (1), lens (2) include first surface (21) and second surface (22), the light that light source (1) jetted out passes through in proper order first surface (21) with second surface (22), first surface (21) are rotational symmetry curved surface, first surface (21) are used for convergent light, second surface (22) are free curved surface, optical axis (221) on second surface slope in optical axis (211) on first surface, second surface (22) are used for changing the exit angle of light.
2. The transmissive optical module of claim 1, wherein: an angle between an optical axis (211) of the first surface and an optical axis (221) of the second surface is θ, θ >0 °.
3. A transmissive optical module according to any of claims 1-2, wherein: the first surface (21) is spherical, and the first surface (21) protrudes outwards towards the light source (1).
4. A transmissive optical module according to any of claims 1-2, wherein: the first surface (21) is an aspheric surface, and the expression of the aspheric surface shape of the first surface (21) is
Figure FDA0002840601050000011
Where z is the high vector of the aspheric surface, c is the curvature of the aspheric surface, r is the radial coordinate in units of lens length, k, α1～α8Are all aspheric coefficients.
5. A transmissive optical module according to any of claims 1-2, wherein: the second surface (22) is a Zernike polynomial free-form surface with the expression of
Figure FDA0002840601050000012
Wherein z is the rise of the second surface (22), the first term to the right of the equal sign is the Conic surface portion, c is the curvature of the second surface (22), r is the radial coordinate in units of lens length, k is the quadratic aspheric constant, N is the number of polynomial coefficients, A is the number of aspheric coefficientsiIs a polynomial coefficient of the i-th term, Ei(x, y) are higher order polynomials of x and y of the i-th term, both of which are variables of the polynomial.
6. A transmissive optical module according to any of claims 1-2, wherein: the lens (2) further comprises a third surface (23) and a fourth surface (24), and the first surface (21), the third surface (23), the second surface (22) and the fourth surface (24) are sequentially connected.
7. The transmissive optical module of claim 6, wherein: the number of the light sources (1) and the number of the lenses (2) are a plurality, the third surface (23) and the fourth surface (24) of each lens (2) are connecting surfaces, and the lenses (2) are connected.
8. The transmissive optical module of claim 7, wherein: the optical module further comprises a PCB (printed circuit board) board (3), the light sources (1) are uniformly distributed on the PCB board (3), and the lenses (2) are uniformly distributed in front of the light sources (1).
CN202011490665.7A 2020-12-16 2020-12-16 Transmission-type optical module Pending CN112524573A (en)

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Application Number Priority Date Filing Date Title
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Publications (1)

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CN112524573A true CN112524573A (en) 2021-03-19

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