Optical lens rear reflection point detection device

Abstract

The utility model discloses a device for detecting a rear reflection point of an optical lens, and the device comprises an optical assembly which is used for transmitting a collimated laser beam to a to-be-detected optical lens; the acquisition unit is configured to move along the optical axis of the collimated laser beam, is used for acquiring the focus of the backward focusing laser beam reflected by the optical lens along the optical axis and converting an optical signal of the focus into a current signal, and at least comprises a probe which has a reflecting surface which forms an acute included angle with the optical axis and faces the optical lens; the data processing unit is used for processing and analyzing the current signal transmitted by the acquisition unit to obtain the position, intensity and quantity information of a rear reflection focus; according to the utility model, the problems of low detection precision, complex structure and inconvenient operation of the traditional field lens rear reflection focus detection device can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical measurement and detection field, concretely relates to a kind of optical lens rear reflection point detection device. BACKGROUND

[0002] In the field of laser scanning, laser processing, medical treatment, the performance of field lens has crucial influence on the overall precision and efficiency of system, by accurately detecting and positioning the rear reflection focus of field lens, the performance of laser scanning system can be optimized, and processing precision and efficiency are improved.The traditional field lens rear reflection focus detection device has the problems of low detection precision, complex structure and inconvenient operation. UTILITY MODEL CONTENT

[0003] To overcome the above-mentioned shortcomings, the utility model aims at providing an optical lens rear reflection point detection device.

[0004] In order to achieve the above purpose, the utility model adopts the technical scheme including: an optical assembly is used to emit a collimated laser beam towards the optical lens to be detected; a collection unit is configured to move along the optical axis of the collimated laser beam, for collecting the focus of the rear return focus laser beam reflected by the optical lens along the optical axis and converting the optical signal of the focus into an electric current signal, and at least including a probe having an acute angle with the optical axis and a reflecting surface towards the optical lens; a data processing unit is used to process and analyze the electric current signal transmitted by the collection unit to obtain the position, intensity and number information of the rear reflection focus.

[0005] In the preferred technical scheme of the above optical lens rear reflection point detection device, the optical assembly includes a laser light source for emitting a laser beam, and a fine adjustment structure for collimating the laser beam emitted by the laser light source, the fine adjustment structure at least includes an optical lens group moving along the optical axis direction of the laser beam.

[0006] In the preferred technical scheme of the above optical lens rear reflection point detection device, the fine adjustment structure further includes a coaxially arranged outer lens barrel and an inner lens barrel arranged inside the outer lens barrel and transversely movable in the outer lens barrel, the optical lens group is arranged in the inner lens barrel, the outer wall of the inner lens barrel is provided with an annular groove, a knob is rotatably mounted on the outer lens barrel, and a limiting rod is eccentrically arranged on the bottom surface of the knob and extends into the annular groove.

[0007] In the preferred technical scheme of the above optical lens rear reflection point detection device, the collection unit further includes a band-pass filter for filtering the laser beam reflected by the reflecting surface of the probe, and a full-waveband linear silicon photocell module for converting the filtered laser beam of the band-pass filter into an electric current signal.

[0008] In the preferred technical scheme of the optical lens rear reflection point detection device, the laser light source end is provided with a light shielding cylinder, a water cooling cavity is formed in the light shielding cylinder, and the water cooling cavity has an inlet and an outlet to communicate with an external circulation device.

[0009] In the preferred technical scheme of the optical lens rear reflection point detection device, a spiral water channel is arranged in the water cooling cavity, and the inlet and the outlet respectively communicate with two ends of the spiral water channel.

[0010] In the preferred technical scheme of the optical lens rear reflection point detection device, the light shielding cylinder end is provided with an outer lens barrel coaxial with the laser beam optical axis and an inner lens barrel transversely movable in the outer lens barrel, the optical lens group is arranged in the inner lens barrel, a ring groove is formed in the outer wall of the inner lens barrel, a knob is rotatably arranged on the outer lens barrel, and a limiting rod extending into the ring groove is arranged eccentrically on the bottom surface of the knob.

[0011] In the preferred technical scheme of the optical lens rear reflection point detection device, a heat dissipation assembly receiving the laser beam passing through the optical lens is arranged at the rear position of the optical lens along the emission direction of the collimated laser beam, and the heat dissipation assembly at least includes a graphite plate and a cold source for heat dissipation of the graphite plate.

[0012] In the preferred technical scheme of the optical lens rear reflection point detection device, the graphite plate has a concentric circular thread structure on the side surface receiving the laser beam passing through the optical lens.

[0013] In the preferred technical scheme of the optical lens rear reflection point detection device, the acquisition unit and the data processing unit are driven to move along the optical axis of the collimated laser beam by a linear module driver.

[0014] In the preferred technical scheme of the optical lens rear reflection point detection device, a grating ruler is arranged on the linear module driver, and a reading head is arranged on the acquisition unit and located directly above the grating ruler. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a front view of the utility model;

[0016] Figure 2 It is a sectional view of the optical assembly;

[0017] Figure 3 It is a schematic view of the acquisition unit;

[0018] Figure 4 It is a position relation diagram of the acquisition unit, the optical lens and the graphite plate;

[0019] Figure 5 It is a connection relation diagram of the graphite plate and the cold source;

[0020] In the diagram: Optical component 1, laser source 11, single-mode laser QBH fiber optic patch cord 111, QBH connector 112, fine-tuning structure 12, optical lens group 121, outer lens barrel 122, inner lens barrel 123, annular groove 1231, knob 124, limit rod 125, acquisition unit 2, probe 21, reflective surface 211, bandpass filter 22, full-band linear silicon photovoltaic cell module 23, optical lens 3, data processing unit 4, light shield 5, water cooling cavity 51, spiral water channel 511, graphite plate 71, concentric thread structure 711, heat pipe 72, heat dissipation fins 73, cooling fan 74, linear module driver 8, grating ruler 9, reading head 10. Detailed Implementation

[0021] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0022] It should be noted that in the description of this utility model, terms such as "upper," "lower," "left," "right," "front," and "rear," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] like Figures 1 to 5 As shown, the optical lens back reflection point detection device of this utility model includes: an optical component 1, used to emit a collimated laser beam toward the optical lens 3 to be tested; a collection unit 2, configured to move along the optical axis of the collimated laser beam, used to collect the focal point of the back-reflecting laser beam reflected by the optical lens 3 along the optical axis and convert the light signal of the focal point into a current signal, including at least a probe 21 having a reflective surface 211 that forms an acute angle with the optical axis and faces the optical lens 3; and a data processing unit 4, used to process and analyze the current signal transmitted by the collection unit 2 to obtain information on the position, intensity, and number of back reflection focal points.

[0025] See Figure 1 , Figure 4The optical assembly 1, the acquisition unit 2 and the data processing unit 4 are arranged on the substrate; the optical assembly 1 is used to emit a collimated laser beam, the optical lens 3 is located on the optical axis of the collimated laser beam, and the optical lens 3 to be detected for the back reflection focal point position can be a field lens; the acquisition unit 2 at least includes a probe 21, the probe 21 has a reflection surface 211 which forms an acute angle with the optical axis of the laser beam, and the reflection surface 211 is used to receive and reflect the focal point of the back reflection laser beam of the optical lens 3; and the data processing unit 4 can process and analyze the current signal of the back reflection focal point collected by the acquisition unit 2 to obtain the position and intensity information of different back reflection focal points.

[0026] Specifically, when detecting the back reflection focal point information of the optical lens 3, first, the optical lens 3 to be detected is placed at a preset position, then the optical assembly 1 is used to emit a collimated laser beam towards the center of the optical lens 3, after the collimated laser beam enters the optical lens 3, it is divided into two paths, the first path of the laser beam can pass through the optical lens 3, and the second path of the laser beam is reflected vertically by the optical lens 3 and then is emitted along the optical axis of the original collimated laser beam to the obliquely arranged reflection surface 211 of the probe 21, then the probe 21 is moved along the optical axis of the laser beam so that the focal point of the second path of the laser beam is located on the reflection surface 211 of the probe 21, so that the acquisition unit 2 can receive the laser signal and convert it into an electric signal, after the acquisition unit 2 transmits the electric signal to the data processing unit 4, the data processing unit 4 filters, amplifies and digitizes the electric signal, thereby obtaining the position and intensity information of the reflection focal point of the second path of the laser beam, which has the characteristics of accurate testing, high testing efficiency and practicality of the back reflection focal point information of the optical lens 3, in addition, by accurately detecting and positioning the back reflection point of the optical lens 3, the performance of the laser scanning system with the optical lens 3 can be optimized, and the workpiece machining precision and efficiency can be improved.

[0027] In one or more embodiments, the optical assembly 1 includes a laser light source 11 for emitting a laser beam, a fine adjustment structure 12 for collimating the laser beam emitted by the laser light source 11, the fine adjustment structure 12 at least includes an optical lens group 121 which moves along the optical axis direction of the laser beam; the fine adjustment structure 12 further includes a coaxially arranged outer lens barrel 122 and an inner lens barrel 123 which is arranged inside the outer lens barrel 122 and can move transversely in the outer lens barrel 122, the optical lens group 121 is arranged in the inner lens barrel 123, the outer wall of the inner lens barrel 123 is provided with a ring groove 1231, and the bottom surface of a knob 124 is eccentrically provided with a limiting rod 125 which extends into the ring groove 1231.

[0028] Referring to Figure 1 , Figure 2, the laser light source 11 at least includes a single-mode laser QBH fiber jumper 111 and a QBH joint 112 connected thereto, and along the laser beam emission direction, the rear end of the laser light source 11 is provided with a fine adjustment structure 12, which is used to collimate the laser beam emitted by the laser light source 11, so as to obtain a parallel collimated laser beam with excellent beam quality, thereby ensuring the accuracy of the rear reflection focal point test of the optical lens 3 by the acquisition unit 2. The fine adjustment structure 12 includes a coaxially arranged outer barrel 122, an inner barrel 123 and an optical lens group 121, wherein the inner barrel 123 is slidingly arranged in the outer barrel 122, and the optical lens group 121 is fixedly arranged in the inner barrel 123. An annular groove 1231 is formed on the outer wall of the inner barrel 123, and a knob 124 is rotatably arranged on the outer barrel 122. A limiting rod 125 is eccentrically arranged at the bottom end of the knob 124, and the limiting rod 125 extends into the annular groove 1231 of the outer wall of the inner barrel 123.

[0029] Specifically, when collimating the laser beam emitted by the laser light source 11, the knob 124 is rotated clockwise or counterclockwise, so that the limiting rod 125 is synchronously rotated clockwise or counterclockwise around the central axis of the knob 124, and the limiting rod 125 pushes the inner barrel 123 to move right or left inside the outer barrel 122, thereby adjusting the distance between the laser light source 11 and the optical lens group 121, so that the laser beam emitted by the optical lens group 121 is a collimated mirror beam. In addition, the adjusting structure is simple and has high adjusting precision. Furthermore, the accuracy of the rear reflection focal point test of the optical lens 3 by the acquisition unit 2 can be improved through the above arrangement.

[0030] In one or more embodiments, the laser light source 11 is provided with a light shielding barrel 5, and a water cooling cavity 51 is formed in the light shielding barrel 5. The water cooling cavity 51 has an inlet and an outlet to communicate with an external circulating device. A spiral water channel 511 is arranged in the water cooling cavity 51, and the inlet and the outlet communicate with two ends of the spiral water channel 511, respectively.

[0031] Referring to Figure 1 , Figure 2 The light shielding barrel 5 is arranged between the laser light source 11 and the fine adjustment structure 12. A cavity is formed in the inner wall of the light shielding barrel 5, which is a water cooling cavity 51. A spiral baffle is arranged in the water cooling cavity 51, so that a spiral water channel 511 is formed in the water cooling cavity 51, and the fluid flowing through the water cooling cavity 51 forms a spiral shape. The light shielding barrel 5 is provided with an inlet and an outlet at two ends of the spiral water channel 511 of the water cooling cavity 51, respectively. The inlet and the outlet communicate with an external circulating device, and the circulating device at least includes a water pump.

[0032] Specifically, the laser beam emitted by the laser light source 11 passes through the light shielding cylinder 5, which can reduce the interference of the external environment on the laser beam. In addition, water is supplied to the water cooling cavity 51 of the light shielding cylinder 5 through the circulating device, and the water flow passes through the spiral water knife to cool the laser light source 11 and the fine adjustment structure 12, thereby improving the thermal balance stability of the laser light source 11 and the optical lens group 121 and ensuring the stable output of the parallel collimated laser beam.

[0033] In one or more embodiments, the acquisition unit 2 further comprises a band-pass filter 22 for filtering the laser beam reflected by the reflecting surface 211 of the probe 21, and a full-waveband linear silicon photocell module 23 for converting the filtered laser beam of the band-pass filter 22 into an electric current signal.

[0034] Referring to Figure 1 , Figure 3 , Figure 4 , the band-pass filter 22 only allows light of a specific wavelength range to pass through while blocking other wavelengths outside the passband, and the full-waveband linear silicon photocell module 23 can linearly convert the incident light intensity into an electric current signal.

[0035] The focal point of the reflected laser beam on the reflecting surface 211 of the probe 21 is reflected by the band-pass filter 22 to the full-waveband linear silicon photocell module 23, which converts the light signal into an electric current signal and transmits it to the data processing unit 4. The data processing unit 4 processes and analyzes the electric current signal transmitted by the full-waveband linear silicon photocell module 23 to obtain the position and intensity of the reflected focal point.

[0036] It should be noted that the optical lens 3 to be detected is taken as an example of a field lens, which is generally composed of multiple lens groups. In actual laser processing applications, there may be multiple focal points of the reflected laser beam of the field lens. Therefore, the acquisition unit 2 needs to be moved to collect different focal points reflected by the optical lens 3. Specifically, the reflecting surface 211 of the probe 21 located on the optical axis can receive the focal points of the reflected laser beam at different positions by moving the probe 21 along the optical axis of the collimated laser beam. This method has the characteristics of simple structure, convenient operation, and high testing precision, and is practical.

[0037] In one or more embodiments, a heat dissipation assembly is arranged at the rear position of the optical lens 3 to receive the laser beam passing through the optical lens 3 along the emission direction of the collimated laser beam. The heat dissipation assembly at least includes a graphite plate 71 and a cold source for dissipating heat from the graphite plate 71. The side surface of the graphite plate 71 receiving the laser beam passing through the optical lens 3 is a concentric circular thread structure 711.

[0038] Referring to Figure 1 , Figure 4 , Figure 5The collimated laser beam emitted by the laser light source 11 is split into two paths after being incident on the optical lens 3. The first path of the laser beam is transmitted through the optical lens 3 to irradiate the center of the graphite plate 71. The second path of the laser beam is reflected vertically by the optical lens 3 to be incident on the reflecting surface 211 of the probe 21 along the optical axis of the original collimated laser beam, so as to be converted into an electric current signal by the full-waveband linear silicon photocell module 23 and transmitted to the data processing unit 4 for processing.

[0039] Referring to Figure 5 The cold source includes a heat conduction pipe 72 made of copper material arranged at the back of the graphite plate 71, heat dissipation fins 73 connected with the heat conduction pipe 72, and a heat dissipation fan 74 arranged on the heat dissipation fins 73. When the graphite plate 71 is heated, the heat of the graphite plate 71 is conducted to the heat dissipation fins 73 through the heat conduction pipe 72, and the heat dissipation fan 74 is used to rapidly cool the heat dissipation fins 73, so as to realize effective cooling of the graphite plate 71. When the laser beam is transmitted through the optical lens 3 to irradiate the center of the graphite plate 71, the graphite plate 71 serves as a termination or absorption body of the laser beam, so as to avoid interference of the reflected laser beam with the detection signal, and meanwhile, the graphite plate 71 can absorb the heat of the laser beam. The side of the graphite plate 71 facing the laser light source 11 is a concentric screw structure, which can increase the contact area with the laser beam, reduce the density of the laser energy per unit area, and effectively avoid the reflection of the laser beam on the graphite plate 71 to affect the testing effect of the device.

[0040] In one or more embodiments, the acquisition unit 2 and the data processing unit 4 are driven to move along the optical axis of the collimated laser beam by the linear module driver 8. The linear module driver 8 is provided with a grating ruler 9, and the acquisition unit 2 is arranged with a reading head 10 located directly above the grating ruler 9.

[0041] Referring to Figure 1 , Figure 3 The linear module driver 8 realizes non-contact and non-friction linear motion through the electromagnetic force between the magnetic steel stator and the mover, has the characteristics of high displacement accuracy and fast response, and controls the acquisition unit 2 to move along the optical axis direction of the collimated laser beam, so that the reflecting surface 211 of the probe 21 receives the laser beam focal points at different positions after being reflected by the optical lens 3. The acquisition unit 2 driven by the linear module driver 8 has higher displacement accuracy by arranging the reading head 10 on the acquisition unit 2 and the grating ruler 9 on the linear module driver 8, so as to improve the detection accuracy of the reflected focal points behind the optical lens 3.

[0042] The above embodiments are only for illustrating the technical concept and characteristics of the present application, the purpose is to enable the person skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. An optical lens rear reflection point detection device, characterized in that, The application relates to an optical lens detection device. The optical assembly is used for emitting a collimated laser beam towards an optical lens to be detected. The acquisition unit is configured to move along the optical axis of the collimated laser beam, and is used for acquiring a focus point of a back-reflected focused laser beam reflected by the optical lens along the optical axis and converting an optical signal of the focus point into an electric current signal, and at least comprises a probe with a reflecting surface at an acute angle with the optical axis and towards the optical lens. The data processing unit is used for processing and analyzing the electric current signal transmitted by the acquisition unit to obtain position, intensity and quantity information of the back-reflected focus point.

2. The optical lens rear reflection point detection device according to claim 1, characterized in that: The optical assembly comprises a laser light source for emitting a laser beam, and a fine adjustment structure for collimating the laser beam emitted by the laser light source, wherein the fine adjustment structure at least comprises an optical lens group moving along the optical axis direction of the laser beam.

3. The optical lens rear reflection point detection apparatus according to claim 2, characterized in that: The fine adjustment structure further comprises a coaxial outer lens barrel and an inner lens barrel arranged inside the outer lens barrel and capable of moving transversely in the outer lens barrel, the optical lens group is arranged in the inner lens barrel, the outer wall of the inner lens barrel is provided with an annular groove, a knob is rotatably arranged on the outer lens barrel, and a limiting rod extending into the annular groove is arranged eccentrically on the bottom surface of the knob.

4. The optical lens rear reflection point detection apparatus according to claim 1, wherein: The acquisition unit further comprises a band-pass filter for filtering the laser beam reflected by the reflecting surface of the probe, and a full-waveband linear silicon photocell module for converting the filtered laser beam into an electric current signal.

5. The optical lens rear reflection point detection apparatus according to claim 2, wherein: The laser light source is provided with a light-shielding barrel at the tail end, a water-cooling cavity is formed in the light-shielding barrel, and the water-cooling cavity is provided with an inlet and an outlet to communicate with an external circulating device.

6. The optical lens rear reflection point detection apparatus according to claim 5, wherein: A spiral water channel is arranged in the water-cooling cavity, and the inlet and the outlet respectively communicate with two ends of the spiral water channel.

7. The optical lens rear reflection point detection apparatus according to claim 1, wherein: A heat dissipation assembly for receiving the laser beam transmitted through the optical lens is arranged at the rear position of the optical lens along the emission direction of the collimated laser beam, and the heat dissipation assembly at least comprises a graphite plate and a cold source for dissipating heat of the graphite plate.

8. The optical lens rear reflection point detection apparatus according to claim 7, wherein: The side surface of the graphite plate for receiving the laser beam transmitted through the optical lens is a concentric circular thread structure.

9. The optical lens rear reflection point detection apparatus according to claim 1, wherein: The acquisition unit and the data processing unit are driven to move along the optical axis of the collimated laser beam by a linear module driver.

10. The optical lens rear reflection point detection device according to claim 9, characterized in that: A grating ruler is arranged on the linear module driver, and a reading head is arranged on the acquisition unit and located directly above the grating ruler.

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