CN212623090U

CN212623090U - Small-size high accuracy laser displacement sensor

Info

Publication number: CN212623090U
Application number: CN202022088035.9U
Authority: CN
Inventors: 曾彬
Original assignee: Shenzhen Boyi Sensing Technology Co ltd
Current assignee: Shenzhen Boyi Sensing Technology Co ltd
Priority date: 2020-09-22
Filing date: 2020-09-22
Publication date: 2021-02-26
Anticipated expiration: 2030-09-22

Abstract

The utility model discloses a small-size high accuracy laser displacement sensor, including the installation shell, install optical module and main control PCB in the installation shell and install the operating panel on the installation shell, optical module includes the optical support, install on the optical support be used for to the measured object project laser emission subassembly, be used for refracting the measured object reflected laser refraction subassembly and be used for receiving refraction subassembly refraction laser receiving assembly, laser emission subassembly includes the laser emission lamp, light ring size control circle and transmitting end flat lens, the installation shell is located and is installed on the lateral wall of laser emission lamp projection direction and is strained miscellaneous light lens, refraction subassembly includes receiving convex lens, receiving end light filter and reflector, laser receiving assembly includes receiver and receiver PCB, the laser that returns through the measured object passes through receiving convex lens rethread reflector and focuses on the receiver, the volume is reduced significantly.

Description

Small-size high accuracy laser displacement sensor

Technical Field

The utility model relates to a sensor technical field specifically is a small-size high accuracy laser displacement sensor.

Background

The laser displacement sensor realizes high-precision detection of an object to be detected based on a triangular distance measurement mode. The laser displacement sensor realizes dynamic non-contact high-precision displacement measurement with excellent measurement performance, and mainly comprises an optical part and an electronic circuit part, wherein the optical part mainly comprises: a laser emitting portion that irradiates laser light to an object to be measured; the receiving convex lens is used for condensing the light emitted by the measured object; and a light receiving element for receiving the condensed light and finally determining the light receiving center position. The laser emission axis and the reception axis intersect at a prescribed angle. The electronic circuit portion mainly has: the power supply module converts an external input power supply into a power supply voltage which can normally work; the processor is used for controlling the overall working time sequence of the sensor; the laser emission circuit: used for controlling the laser emission power. An output module: and outputting corresponding control quantity according to the displacement detected by the sensor for use by the rear end.

In recent years, especially with the continuous development of modern photoelectric technology, laser displacement sensors become the mainstream of non-contact monitoring products and have been widely applied at home and abroad. With the continuous development of the industrial automation industry, higher requirements are made on the volume and the like of the laser displacement sensor.

Volume problem: the main factor for determining the size of the laser displacement sensor depends on the size of the internal optical structure, and in the current common practice in the market, as shown in fig. 1, the laser reflected by the object to be measured is directly focused on the receiver through the receiving convex lens, resulting in a larger overall optical structure size.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a small-size high accuracy laser displacement sensor to solve above-mentioned problem.

In order to achieve the above object, the utility model provides a following technical scheme:

a small-sized high-precision laser displacement sensor comprises an installation shell, an optical module and a main control PCB which are installed in the installation shell, and an operation panel which is installed on the installation shell, wherein the optical module comprises an optical support, a laser emission component which is installed on the optical support and used for projecting laser to a measured object, a refraction component used for refracting the laser reflected by the measured object, and a laser receiving component used for receiving the refracted laser of the refraction component, the laser emission component comprises a laser emission lamp, an aperture size control ring and an emission end flat lens, the laser emission lamp is installed on the optical support, the optical support is provided with the aperture size control ring and the emission end flat lens along a laser projection path, the two sides of the emission end flat lens are respectively provided with the aperture size control ring, the laser emission lamp is connected with an emission lamp PCB, and the installation shell is provided with an impurity filtering lens which is positioned on the side wall of the projection direction of the laser emission lamp, the refraction subassembly is including receiving convex lens, receiving end light filter and reflector, receiving convex lens, receiving end light filter and reflector are installed in proper order on optical bracket and are located the laser path of testee reflection, and receiving convex lens is located between receiving end light filter and the testee, the laser receiving subassembly includes receiver and receiver PCB, receiver PCB installs on optical bracket and is located the refraction laser's of refraction subassembly route, and the receiver is installed on receiver PCB.

On the basis of the technical scheme, the utility model discloses still provide following optional technical scheme:

in one alternative: the installation shell is enclosed by drain pan and the upper cover of installing in drain pan one side and constitutes, the upper cover is connected with the drain pan through pre-buried copper nut.

In one alternative: the main control PCB is arranged on one side, close to the upper cover, of the inner cavity of the bottom shell, at least one positioning column is arranged on the bottom shell, and a positioning hole for the positioning column to penetrate through is formed in the main control PCB.

In one alternative: the optical bracket is fixedly arranged on the inner wall of the bottom shell opposite to the upper cover.

In one alternative: a receiver PCB gasket is arranged between the receiver PCB and the optics.

In one alternative: the operating panel includes PCB keypad and OLED display screen, the PCB keypad is installed and is kept away from the one side of straining the parasitic light lens in the installation shell, is equipped with a plurality of buttons on the PCB keypad, has seted up the key hole on the conchal wall of installation shell, the OLED display screen is installed to one side that the PCB mounting panel is close to the conchal wall of installation shell, install display screen protection lens on the conchal wall of installation shell.

In one alternative: and a key film is arranged on the key.

In one alternative: the OLED display screen is connected with the PCB key board through the display screen fixing piece.

In one alternative: the PCB is provided with an indicator light, and the wall of the mounting shell is provided with a transparent outer lamp cover and a semitransparent inner lamp cover which are convenient for observing the indicator light.

In one alternative: the circuit system comprises a power supply module, a laser emission module, a photosensitive device, a digital signal amplification regulating circuit, a signal filter circuit, a signal acquisition circuit, a processor, an input and output control circuit, a display module and a key module, wherein the laser emission module comprises a laser control circuit and a laser tube, the laser emission module is controlled by an MCU (microprogrammed control unit) processor, the MCU processor controls the laser emission module to emit laser with specific power according to specific time sequence, the photosensitive device receives light reflected by a measured object to perform photoelectric conversion, the photosensitive device is controlled by the MCU processor, the MCU processor controls the photosensitive device to receive light and perform photoelectric conversion according to the specific time sequence, the digital signal amplification regulating circuit receives signals output by the photosensitive device, the amplification factor of the digital signal amplification regulating circuit is controlled by the MCU according to the size of the received signals, and the signal filter circuit filters the amplified signals, and finally, an ADC module arranged in the MCU is used for carrying out signal acquisition on the filtered signal, a control input and output module is used for carrying out working state setting on the sensor or carrying out output action on the detected distance, a key module is used for controlling the working mode and the like of the sensor, and an OLED Chinese display module is used for displaying the working state or the distance measurement displacement of the sensor.

Compared with the prior art, the beneficial effects of the utility model are as follows:

the laser projected by the laser emitting lamp is projected onto a measured object after the size of a light spot is controlled by the aperture size control ring, and then reflected back to be focused by the receiving convex lens and refracted to the receiver by the reflector, thus completing one work, the laser can be automatically converted into an actual distance at the position of a photosensitive strip of the receiver, the laser reflected back by the measured object passes through the receiving convex lens and then is focused on the receiver by the reflector, the volume is obviously reduced, a receiving end optical filter with a specific wavelength is added between the receiving convex lens and the receiver, so as to filter stray light, thereby increasing the effective signal-to-noise ratio of the product, a digital signal amplification adjusting module and a signal filtering circuit are added between the receiver and the MCU, the adjustment of the signal can be accelerated, the amplification multiplying speed of the product signal is increased, the accurate detection of a weak reflecting surface can be faster, and the high-definition OLDE Chinese display is used, is simple and easy to understand.

Drawings

Fig. 1 is a schematic diagram of the operation of the prior art.

Fig. 2 is a working principle diagram of the first embodiment of the present invention.

Fig. 3 is an external view of the first embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a bottom case according to a first embodiment of the present invention.

Fig. 5 is a plan view of the first embodiment of the present invention.

Fig. 6 is an exploded view of the first embodiment of the present invention.

Fig. 7 is an exploded view of an optical module according to a first embodiment of the present invention.

Fig. 8 is a schematic structural diagram of a second embodiment of the present invention.

Notations for reference numerals: the LED display screen comprises a base shell 1, an upper cover 2, a translucent inner lamp cover 3, a transparent outer lamp cover 4, a display screen protective lens 5, a key film 6, an OLED display screen 7, a display screen fixing piece 8, a PCB key board 9, a stray light filtering lens 10, an emission lamp PCB11, a laser emission lamp 12, an optical bracket 13, an aperture size control sheet 14, an emission end flat lens 15, a receiver PCB16, a receiver PCB 17, a receiver PCB gasket 18, a receiving convex lens 19, a receiving end optical filter 19, a reflector 20, a power line 21, a pre-buried copper nut 22 and a main control PCB 23.

Detailed Description

The present invention will be described in detail with reference to the following embodiments, wherein like or similar elements are designated by like reference numerals throughout the drawings or description, and wherein the shape, thickness or height of the various elements may be expanded or reduced in practical applications. The embodiments of the present invention are provided only for illustration, and not for limiting the scope of the present invention. Any obvious and obvious modifications or alterations to the present invention can be made without departing from the spirit and scope of the present invention.

Example 1

Referring to fig. 2 to 7, in an embodiment of the present invention, a small-sized high-precision laser displacement sensor includes a mounting housing, an optical module and a main control PCB23 installed in the mounting housing, and an operating panel installed on the mounting housing, in this embodiment, preferably, the mounting housing is formed by surrounding a bottom case 1 and an upper cover 2 installed on one side of the bottom case 1, the upper cover 2 is preferably connected to the bottom case 1 through a pre-embedded copper nut 22, the main control PCB23 is preferably installed on one side of an inner cavity of the bottom case 1 close to the upper cover 2, the bottom case 1 is provided with at least one positioning post, the main control PCB23 is provided with a positioning hole for the positioning post to pass through, the optical module includes an optical bracket 13, a laser emitting assembly installed on the optical bracket 13 for projecting laser to a measured object, a refraction assembly for refracting laser reflected by the measured object, and a laser receiving assembly for receiving refracted laser, in this embodiment, the optical bracket 13 is fixedly installed on the inner wall of the bottom case 1 opposite to the upper cover 2, the laser emitting assembly includes a laser emitting lamp 12, an aperture size control ring and an emitting end flat lens 15, the laser emitting lamp 12 is installed on the optical bracket 13, the optical bracket 13 is installed with the aperture size control ring and the emitting end flat lens 15 along the laser projection path, the aperture size control ring is arranged on both sides of the emitting end flat lens 15, the laser emitting lamp 12 is connected with an emitting lamp PCB11, the installation case is installed with the impurity filtering lens 10 on the side wall of the laser emitting lamp 12 in the projection direction, the refraction assembly includes a receiving convex lens 18, a receiving end optical filter 19 and a reflective mirror 20, the receiving convex lens 18, the receiving end optical filter 19 and the reflective mirror 20 are sequentially installed on the optical bracket 13 and located on the laser path reflected by the object to be measured, the receiving convex lens 18 is positioned between the receiving end optical filter 19 and a measured object, the laser receiving assembly comprises a receiver and a receiver PCB16, the receiver PCB16 is installed on the optical bracket 13 and positioned on a path of refracted laser of the refraction assembly, and the receiver is installed on the receiver PCB 16. in the embodiment, a receiver PCB gasket 17 is arranged between the receiver PCB16 and the optics, when the laser receiving assembly works, as shown in figure 2, laser projected by the laser emitting lamp 12 is projected onto the measured object after passing through an aperture size control circle to control the size of a light spot, and then is reflected back to be focused by the receiving convex lens 18 and then is refracted onto the receiver through the reflector 20, so that one work is completed, and the laser can be automatically converted into an actual distance at the position of a photosensitive strip of the receiver;

further, a power line 21 for supplying power is connected to the mounting shell;

the operating panel includes PCB keypad 9 and OLED display screen 7, PCB keypad 9 is installed and is kept away from the one side of straining parasitic light lens 10 in the installation shell, is equipped with a plurality of buttons on PCB keypad 9, has seted up the key hole on the conchal wall of installation shell, in this embodiment, be equipped with button film 6 on the button, OLED display screen 7 is installed to one side that the PCB mounting panel is close to the conchal wall of installation shell, in this embodiment, OLED display screen 7 passes through display screen mounting 8 and is connected with PCB keypad 9, install display screen protection lens 5 on the conchal wall of installation shell, be equipped with the pilot lamp on the PCB keypad 9, install the transparent outer lamp lid 4 and the translucent inner lamp lid 3 of being convenient for observe the pilot lamp on the conchal wall of installation shell.

Example 2

Referring to fig. 8, an embodiment of the present invention is based on the embodiment, further including a circuit system, the circuit system includes a power module, a laser emitting module, a photosensitive device, a digital signal amplifying and adjusting circuit, a signal filtering circuit, a signal collecting circuit, a processor, an input and output control circuit, a display module and a key module, the laser emitting module includes a laser control circuit and a laser tube, the laser emitting module is controlled by an MCU processor, the MCU processor controls the laser emitting module to emit laser with specific power according to a specific time sequence, the photosensitive device receives light reflected by a measured object to perform photoelectric conversion, the photosensitive device is controlled by the MCU processor, the MCU processor controls the photosensitive device to receive light and perform photoelectric conversion according to the specific time sequence, the digital signal amplifying and adjusting circuit receives signals output by the photosensitive device, the amplification factor of the digital signal is controlled by the MCU according to the size of the received signals, the signal filtering circuit performs a filtering effect on the amplified signal, so that the signal to noise ratio is improved, finally, the MCU is internally provided with an ADC module to perform signal acquisition on the filtered signal, the control input and output module is used for performing working state setting on the sensor or performing output action on the detected distance, the key module is used for controlling the working mode of the sensor and the like, and the OLED Chinese display module is used for displaying the working state or the distance measurement displacement of the sensor.

The utility model discloses a theory of operation is: when the device works, as shown in figure 2, laser projected by a laser emission lamp 12 passes through an aperture size control ring to control the size of a light spot and then is projected onto a measured object, the laser is reflected back to pass through a receiving convex lens 18 to be focused and then is refracted onto a receiver through a reflector 20, thus completing one work, the laser can be automatically converted into an actual distance at the position of a photosensitive strip of the receiver, the laser reflected back by the measured object passes through the receiving convex lens 18 and then is focused on the receiver through the reflector 20, the volume is obviously reduced, a receiving end optical filter 19 with a specific wavelength is added between the receiving convex lens 18 and the receiver to filter stray light, thereby increasing the effective signal-to-noise ratio of a product, a digital signal amplification adjusting module and a signal filter circuit are added between the receiver and an MCU (microprogrammed control unit), the adjustment of signals can be accelerated, the amplification speed of the product signals can be expanded, and the weak reflecting surface can be detected more, and the method is simple and easy to understand by using high-definition OLDE Chinese display.

The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure, and all the changes or substitutions should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A small-sized high-precision laser displacement sensor comprises an installation shell, an optical module and a main control PCB (23) which are installed in the installation shell, and an operation panel which is installed on the installation shell, and is characterized in that the optical module comprises an optical bracket (13), a laser emitting component which is installed on the optical bracket (13) and used for projecting laser to a measured object, a refraction component used for refracting the laser reflected by the measured object, and a laser receiving component used for receiving the refracted laser of the refraction component, wherein the laser emitting component comprises a laser emitting lamp (12), an aperture size control ring and an emitting end flat lens (15), the laser emitting lamp (12) is installed on the optical bracket (13), the optical bracket (13) is provided with the aperture size control ring and the emitting end flat lens (15) along a laser projection path, both sides of the emitting end flat lens (15) are provided with the aperture size control ring, be connected with emission lamp PCB (11) on laser emission lamp (12), the installation shell is located and installs on the lateral wall of laser emission lamp (12) projection direction and strains miscellaneous light lens (10), the refraction subassembly is including receiving convex lens (18), receiving end light filter (19) and reflector (20), receiving convex lens (18), receiving end light filter (19) and reflector (20) are installed in proper order on optical support (13) and are located the laser route of testee reflection, and receiving convex lens (18) are located between receiving end light filter (19) and the testee, the laser receiving subassembly includes receiver and receiver PCB (16), receiver PCB (16) are installed on optical support (13) and are located the refraction laser's of refraction subassembly route, and the receiver is installed on receiver PCB (16).

2. The small-sized high-precision laser displacement sensor according to claim 1, wherein the mounting shell is formed by surrounding a bottom shell (1) and an upper cover (2) mounted on one side of the bottom shell (1), and the upper cover (2) is connected with the bottom shell (1) through an embedded copper nut (22).

3. The small-sized high-precision laser displacement sensor according to claim 2, wherein the main control PCB (23) is installed at one side of the inner cavity of the bottom shell (1) close to the upper cover (2), at least one positioning column is arranged on the bottom shell (1), and a positioning hole for the positioning column to pass through is formed in the main control PCB (23).

4. The compact high-precision laser displacement sensor according to claim 2, wherein the optical bracket (13) is fixedly mounted on an inner wall of the bottom case (1) opposite to the upper cover (2).

5. Compact high precision laser displacement sensor according to claim 1, characterized in that a receiver PCB spacer (17) is provided between the receiver PCB (16) and the optics.

6. The small-sized high-precision laser displacement sensor according to any one of claims 1 to 5, wherein the operation panel comprises a PCB key board (9) and an OLED display screen (7), the PCB key board (9) is installed at one side of the installation shell far away from the stray light filtering lens (10), a plurality of keys are arranged on the PCB key board (9), key holes are formed in the wall of the installation shell, the OLED display screen (7) is installed at one side of the PCB installation plate close to the wall of the installation shell, and a display screen protection lens (5) is installed on the wall of the installation shell.

7. The compact high-precision laser displacement sensor according to claim 6, characterized in that a key membrane (6) is arranged on the key.

8. The compact high-precision laser displacement sensor according to claim 6, characterized in that the OLED display screen (7) is connected with the PCB key board (9) through a display screen fixing member (8).

9. The small-sized high-precision laser displacement sensor according to claim 6, characterized in that an indicator light is arranged on the PCB key board (9), and a transparent outer lamp cover (4) and a translucent inner lamp cover (3) which are convenient for observing the indicator light are arranged on the wall of the mounting shell.

10. The small-sized high-precision laser displacement sensor according to claim 9, further comprising a circuit system, wherein the circuit system comprises a power module, a laser emitting module, a photosensitive device, a digital signal amplifying and adjusting circuit, a signal filtering circuit, a signal collecting circuit, a processor, an input and output control circuit, a display module and a key module, the laser emitting module comprises a laser control circuit and a laser tube, the laser emitting module is controlled by an MCU processor, the MCU processor controls the laser emitting module to emit laser according to a time sequence, the photosensitive device receives light reflected by a measured object to perform photoelectric conversion, the photosensitive device is controlled by the MCU processor, the MCU processor controls the photosensitive device to receive light and perform photoelectric conversion according to the time sequence, the digital signal amplifying and adjusting circuit receives signals output by the photosensitive device, and the amplification factor of the signals is controlled by the MCU according to the size of the received signals, the signal filtering circuit filters the amplified signals, the MCU is provided with an ADC module to acquire the filtered signals, the control input and output module is used for setting the working state of the sensor or outputting the detected distance, the key module is used for controlling the working mode of the sensor and the like, and the OLED Chinese display module is used for displaying the working state of the sensor or the distance measurement displacement.