CN217559742U

CN217559742U - Parallel coaxial light source

Info

Publication number: CN217559742U
Application number: CN202221285087.8U
Authority: CN
Inventors: 钟铭良
Original assignee: Guangdong Shunshangxin Photoelectric Technology Co ltd
Current assignee: Guangdong Shunshangxin Photoelectric Technology Co ltd
Priority date: 2022-05-26
Filing date: 2022-05-26
Publication date: 2022-10-11
Anticipated expiration: 2032-05-26

Abstract

The utility model relates to a parallel light source technical field specifically discloses a parallel coaxial light source, include: the light emitting device comprises a shell, a light source and a light guide plate, wherein the shell is provided with an accommodating cavity and a light emitting window which is communicated with the accommodating cavity to the outer space of the shell; the lamp panel is fixed in the accommodating cavity and is positioned at one end, far away from the light emergent window, of the accommodating cavity; the spectroscope is fixed at one end of the accommodating cavity close to the light outlet window; convex lens, convex lens are fixed in between lamp plate and the spectroscope, be used for with the light parallel irradiation of lamp plate transmission extremely the spectroscope. The utility model provides a parallel coaxial light source can effectively improve the depth of parallelism of each light in the irradiation beam.

Description

Parallel coaxial light source

Technical Field

The utility model relates to a parallel light source technical field especially relates to a parallel coaxial light source.

Background

The parallel coaxial light source is also called as a diffusion coaxial lamp, and the illumination of the parallel coaxial light source is more uniform than that of the traditional light source, so that the accuracy and the reproducibility of machine vision are improved to a certain extent, and therefore, the parallel coaxial light source is often used for detecting strong-reflection objects such as glass.

Referring to fig. 1, the prior art parallel coaxial light source includes:

the light emitting device comprises a shell 1, wherein the shell 1 is provided with an accommodating cavity 101 and a light emitting window 102 for communicating the accommodating cavity 101 with the external space of the shell 1;

the lamp panel 2 is fixed in the accommodating cavity 101 and is positioned at one end, far away from the light emergent window 102, of the accommodating cavity 101;

the spectroscope 3 is fixed at one end of the accommodating cavity 101, which is close to the light outlet window 102;

the Fresnel lens 4 is fixed between the lamp panel 2 and the spectroscope 3.

Specifically, when the lamp panel 2 is lighted, light emitted from the lamp panel 2 firstly passes through the fresnel lens 4 and then irradiates the beam splitter 3, and then is reflected by the beam splitter 3 and passes through the light exit window 102 to be emitted outward, so as to form an irradiation light beam.

Ideally, all the rays in the illumination beam should be perfectly parallel, i.e., the maximum angle between the rays in the illumination beam (hereinafter referred to as "maximum ray angle") is 0 °. However, in practice it has been found that the maximum ray angle of the illuminating beam is not 0 °. Specifically, according to the current state of the art, the maximum light angle can be 3 ° at the minimum.

In recent years, the requirement of visual inspection is higher and higher, and the maximum light ray included angle of 3 ° cannot meet the market demand, that is, the parallelism of each light ray in the irradiation light beam emitted by the existing parallel coaxial light source is too low, and the market demand cannot be met.

Therefore, there is a need for an improved parallel coaxial light source to solve the problem of too low parallelism of the light rays in the illumination light beam emitted by the light source.

The above information disclosed in this background section is only included to enhance understanding of the background of the disclosure and therefore may contain information that does not form the prior art that is currently known to one of ordinary skill in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a parallel coaxial light source can effectively improve the depth of parallelism of each light in the irradiation beam.

To achieve the above object, the present invention provides a parallel coaxial light source, including:

the light emitting device comprises a shell, a light source and a light guide plate, wherein the shell is provided with an accommodating cavity and a light emitting window which is communicated with the accommodating cavity to the outer space of the shell;

the lamp panel is fixed in the accommodating cavity and is positioned at one end, far away from the light emergent window, of the accommodating cavity;

the spectroscope is fixed at one end of the accommodating cavity close to the light outlet window;

further comprising:

convex lens, convex lens are fixed in between lamp plate and the spectroscope, be used for with the light parallel irradiation of lamp plate transmission extremely the spectroscope.

Optionally, the lamp plate includes circuit board and welded connection in lamp pearl on the circuit board.

Optionally, the lamp bead is located at a focal position of the convex lens.

Optionally, the holding cavity includes a conical cavity, and the lamp panel is located in the conical cavity.

Optionally, the accommodating cavity comprises a rectangular cavity communicated with the conical cavity through the convex lens;

the spectroscope is located in the rectangular cavity, and the light-emitting window is communicated with the rectangular cavity.

Optionally, the convex lens is located at the junction of the rectangular chamber and the conical chamber.

Optionally, the diameter of the tapered chamber gradually increases towards the spectroscope.

Optionally, the optical axis of the convex lens is 45 ° to the normal of the beam splitter.

The beneficial effects of the utility model reside in that: a parallel coaxial light source is provided, in which a convex lens has a function of emitting light from a lamp panel in parallel, and the degree of parallelism of the light emitted from the convex lens is higher than that of a Fresnel lens. Therefore, the utility model discloses a convex lens replaces traditional chenille lens, and the light that the lamp plate sent can shine to the spectroscope more parallelly after the convex lens, finally shines the light beam and can toward outwards jets out with littleer biggest light contained angle. Therefore, the utility model provides a parallel coaxial light source can effectively improve the depth of parallelism of each light in the irradiation beam.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 inventive exercise.

FIG. 1 is a schematic diagram of a parallel coaxial light source provided in the background art;

fig. 2 is a schematic structural diagram of a parallel coaxial light source provided by the embodiment.

In the figure:

1. a housing; 101. an accommodating cavity; 1011. a conical chamber; 1012. a rectangular chamber; 102. a light exit window;

2. a lamp panel;

3. a beam splitter;

4. a Fresnel lens;

5. a convex lens.

Detailed Description

To make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below 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 efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Furthermore, the terms "long", "short", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are only for convenience of describing the present invention, but do not indicate or imply that the device or element referred to must have the specific orientation, operate in the specific orientation configuration, and thus, should not be construed as limiting the present invention.

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. However, these embodiments are not intended to limit the present invention, and structural, methodical, or functional changes that may be made by one of ordinary skill in the art based on these embodiments are all included in the scope of the present invention.

The utility model provides a parallel coaxial light source for throw parallel irradiation light beam so that carry out visual detection's applied scene to the object, it adopts convex lens to replace traditional chenille lens, and then effectively improves the depth of parallelism of each light in the irradiation light beam, is favorable to satisfying higher market accuracy requirement.

Referring to fig. 2, in the present embodiment, the parallel coaxial light source includes a housing 1, a lamp panel 2, a beam splitter 3 and a convex lens 5. The housing 1 is provided with an accommodating cavity 101 and a light outlet window 102 for communicating the accommodating cavity 101 with the external space of the housing 1; the lamp panel 2 is fixed in the accommodating cavity 101 and is located at one end of the accommodating cavity 101, which is far away from the light outlet window 102; the spectroscope 3 is fixed at one end of the accommodating cavity 101 close to the light outlet window 102; the convex lens 5 is fixed between the lamp panel 2 and the spectroscope 3, and is used for irradiating the light emitted by the lamp panel 2 to the spectroscope 3 in parallel.

Further, lamp plate 2 includes circuit board and welded connection in lamp pearl on the circuit board. The lamp bead is located at the focal position of the convex lens 5, and the optical axis of the convex lens 5 and the normal of the spectroscope 3 form a 45-degree angle.

It should be noted that, after a great deal of experiments and research by the inventor, it is found that, ideally, all the rays in the irradiation light beam should be parallel to each other, i.e., the maximum ray included angle is 0 °. However, since the light beams irradiated onto the beam splitter 3 through the fresnel lens are not completely parallel, the incident light beam of the beam splitter 3 has a low degree of parallelism, and therefore, the light beams reflected by the beam splitter 3 cannot be kept absolutely parallel, and therefore, in actual work, it is found that the maximum light beam included angle of the finally outgoing irradiation light beam is not 0 °.

In view of this, in order to reduce the parallelism of the illumination beam, one possible improvement direction is to increase the parallelism of the light rays irradiated onto the beam splitter 3. As long as the lamp panel 2 is placed at the focal position of the convex lens 5, the convex lens 5 can have a function of emitting light rays from the lamp panel 2 in parallel, and the degree of parallelism of the light rays emitted from the convex lens 5 is higher than that of the fresnel lens. Therefore, this embodiment adopts convex lens 5 to replace traditional fresnel lens, and the light that lamp plate 2 sent can shine to spectroscope 3 more parallelly behind convex lens 5, and the final light beam that shines can be outwards jetted out with littleer maximum light contained angle.

Further, according to experimental data, after the convex lens 5 is used for replacing a Fresnel lens, the maximum light ray included angle of the irradiation light beam irradiated outwards can be limited within 2 degrees, and compared with the situation that the maximum light ray included angle is 3 degrees, the maximum light ray included angle is smaller, so that when the final irradiation light beam is irradiated to an object, the distribution situation of the generated light spots is more uniform, and the precision and the accuracy of visual detection are greatly improved.

In this embodiment, the accommodating chamber 101 includes a tapered chamber 1011 and a rectangular chamber 1012 communicating with the tapered chamber 1011 through the convex lens 5. The lamp panel 2 is located in the conical cavity 1011; the beam splitter 3 is located in the rectangular chamber 1012, and the light exit window 102 is communicated with the rectangular chamber 1012; the convex lens 5 is located at the junction of the rectangular chamber 1012 and the tapered chamber 1011.

Specifically, the diameter of the tapered cavity 1011 gradually increases toward the beam splitter 3.

It should be noted that traditional holding chamber 101 is the cuboid structure basically all, and partial light that lamp plate 2 sent can shine to the last wall of holding chamber 101 with the angle of the last wall of perpendicular to holding chamber 101 on, and this partial light can be up to complete loss in the unlimited reciprocating reflection between last wall and the lower wall, can't transmit and shine outward in spectroscope 3, finally leads to shining the bright dark inequality of facula to the object.

In a similar way, partial light that lamp plate 2 sent can shine to the lower wall of holding chamber 101 with the angle of the last wall of perpendicular to holding chamber 101 on, and this partial light can be under unlimited reciprocating reflection between wall and the last wall and until the complete loss, also can't transmit to shine outward in spectroscope 3, finally also can lead to shining the bright dark inequality of facula to the object.

In this embodiment, set up lamp plate 2 in the toper cavity 1011 towards spectroscope 3 gradually expanding, the light that lamp plate 2 sent can't be infinitely repeated the reflection in holding chamber 101, must can be guided to convex lens 5 departments, consequently, can improve the luminous intensity of shining the light beam, and then improve the bright and dark homogeneity of shining the facula on the object.

The parallel coaxial light source provided by the embodiment has the following advantages:

(1) the convex lens 5 is used for replacing the traditional Fresnel lens, so that the incident light beam of the spectroscope 3 has higher parallelism, and therefore, the radiation light beam reflected by the spectroscope 3 has higher parallelism;

(2) set up lamp plate 2 in toper cavity 1011, avoid the unlimited reciprocal reflection problem of light, reduce the energy attenuation of light, and then improve the luminous intensity of illuminating the light beam, finally present for improving the bright and dark homogeneity of shining the facula on the object.

It should be understood that although the specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it will be appreciated by those skilled in the art that the specification as a whole may be appropriately combined to form other embodiments as will be apparent to those skilled in the art.

The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. A parallel coaxial light source comprising:

the spectroscope is fixed at one end, close to the light outlet window, of the accommodating cavity;

it is characterized by also comprising:

2. The parallel coaxial light source of claim 1, wherein the lamp panel comprises a circuit board and a lamp bead welded to the circuit board.

3. The parallel coaxial light source of claim 2, wherein the lamp bead is located at a focal position of the convex lens.

4. The parallel coaxial light source of claim 1, wherein the receiving cavity comprises a tapered cavity, and the lamp panel is located in the tapered cavity.

5. The parallel coaxial light source of claim 4, wherein the receiving cavity comprises a rectangular cavity in communication with the conical cavity through the convex lens;

6. The parallel coaxial light source of claim 5, wherein the convex lens is located at the junction of the rectangular chamber and the tapered chamber.

7. The collimated coaxial light source of claim 4, wherein the tapered chamber has a diameter that increases in size towards the beam splitter.

8. The parallel coaxial light source of claim 1, wherein the optical axis of the convex lens is at 45 ° to the normal of the beam splitter.