CN115047478A

CN115047478A - Background suppression type laser sensor

Info

Publication number: CN115047478A
Application number: CN202210834986.7A
Authority: CN
Inventors: 张小毅; 罗超凡; 吴杰英; 龚雪松
Original assignee: Shenzhen Huayifeng Technology Co ltd
Current assignee: Shenzhen Huayifeng Technology Co ltd
Priority date: 2022-07-16
Filing date: 2022-07-16
Publication date: 2022-09-13
Also published as: DE112022005795T5; WO2024016528A1

Abstract

The application relates to a background suppression type laser sensor, which comprises a shell, a laser transmitter, a laser receiver and a control circuit board, wherein the laser transmitter, the laser receiver and the control circuit board are all arranged in the shell, and the transmitter and the laser receiver are respectively electrically connected with the control circuit board; the shell is provided with a window sheet for light to pass through, and two opposite side surfaces of the window sheet are respectively provided with an oblique opening surface; the laser emitter is characterized in that an included angle between the bevel face and the side face where the bevel face is located is an acute angle, the bevel faces are parallel to each other, and the projection range of the two bevel faces on the control circuit board covers the projection range of the laser emitter on the control circuit board. According to the laser detection device, the bevel face is arranged on the window sheet, so that the phenomenon that two light spots are easy to appear when laser passes through the window sheet is reduced, the influence of the two light spots on a detection result is reduced, and the effect of detection precision is improved.

Description

Background suppression type laser sensor

Technical Field

The application relates to the technical field of laser sensors, in particular to a background suppression type laser sensor.

Background

Laser sensors are sensors that measure using laser technology and are generally classified into divergent profile laser sensors and parallel profile laser sensors. The laser sensor is a novel measuring instrument, can realize non-contact remote measurement, and has the advantages of high speed, high precision and strong anti-interference capability.

The laser sensor generally includes a housing, a laser transmitter, a laser receiver, and a measuring circuit, and the laser transmitter transmits laser to a detection area, and the laser receiver detects the amount of laser reflected back in the detection area, and the measuring circuit analyzes and calculates the measurement distance. In the use process, after the laser transmitter emits laser, the laser transmitter penetrates through the light-transmitting sheet on the shell to irradiate the detection area, and the reflected light returns to the laser receiver through the light-transmitting sheet again.

In the related art, after the laser is emitted from the housing, two light spots are generated in the detection area, which affect the laser detection and easily cause a large detection error.

Disclosure of Invention

In order to improve the detection accuracy of a laser sensor, the present application provides a background suppression type laser sensor.

The application provides a background suppression type laser sensor, adopts following technical scheme:

a background suppression type laser sensor comprises a shell, a laser transmitter, a laser receiver and a control circuit board, wherein the laser transmitter, the laser receiver and the control circuit board are all arranged in the shell, and the transmitter and the laser receiver are respectively and electrically connected with the control circuit board; the shell is provided with a window sheet for light to pass through, and two opposite side surfaces of the window sheet are respectively provided with an oblique opening surface; the laser emitter is characterized in that an included angle between the bevel face and the side face where the bevel face is located is an acute angle, the bevel faces are parallel to each other, and the projection range of the two bevel faces on the control circuit board covers the projection range of the laser emitter on the control circuit board.

Through adopting above-mentioned technical scheme, laser emitter, laser receiver and control circuit board set up in the casing, send laser through laser emitter, shine and detect at detection area rear portion light splitting reflection back and by laser receiver. By arranging the bevel face on the window sheet, the path of the laser on the window sheet is changed in the laser emitting process, so that the phenomenon that two points of light spots appear after the laser passes through the window sheet is reduced, and the detection precision is greatly improved.

Optionally, a frosting layer is further disposed on the side where the bevel face is located, and a projection range of the frosting layer on the control circuit board covers a projection range of the bevel face on the control circuit board.

Through adopting above-mentioned technical scheme, the area of the dull polish layer on the window piece will be bigger than the area of bevel connection face to the position that bevel connection face corresponds can shelter from the veiling glare through the dull polish layer in the dull polish layer, avoids the veiling glare to cause great influence to detecting as far as possible.

Optionally, an adjusting bolt, a support and a lens are arranged in the housing, the adjusting bolt is rotatably arranged on the side wall of the housing, the support is in threaded connection with the adjusting bolt, the support and the housing are slidably arranged, the support is arranged between the window sheet and the laser receiver, and the lens is fixed on the support.

Through adopting above-mentioned technical scheme, drive the support through adjusting bolt and remove in the shell to adjusting lens's position, the position of assembling through lens when can accurate adjustment laser reflection return when to different detection distance.

Optionally, an included angle between the optical axis of the lens and the photosensitive surface of the laser receiver is an acute angle.

Through adopting above-mentioned technical scheme, be the slope setting between lens and the laser receiver, when receiving the laser of reflection, the lens of slope has the effect of assembling better to laser to increase detection effect.

Optionally, a shielding cover is arranged on the control circuit board, the shielding cover is sleeved on the laser receiver, and a through hole for light to pass through is formed in the shielding cover.

Through adopting above-mentioned technical scheme, utilize the shield cover to shield the protection to the laser receiver on the control circuit board, increase the interference killing feature, improve detection stability.

Optionally, the housing includes a front shell and a rear cover, and the front shell and the rear cover are fixedly connected in a sealing manner; the window sheet is arranged on the front shell in a sealing mode, a lead penetrates through the rear cover, and the lead is electrically connected with the control circuit board.

Through adopting above-mentioned technical scheme, in the product production process, shell and hou gai assemble laser emitter, laser receiver and control circuit board before utilizing, and production technology is comparatively simple and convenient.

Optionally, a light guide column is further arranged on the rear cover, an indicator lamp is arranged on the control circuit board, the indicator lamp is electrically connected with the control circuit board, and the indicator lamp is located in the projection range of the control circuit board.

Through adopting above-mentioned technical scheme, the last pilot lamp of control circuit board can show current laser sensor's user state, and the light that utilizes the leaded light post to send the pilot lamp simultaneously transmits outside the back lid to demonstrate current pilot lamp's state.

Optionally, a positioning column is arranged in the front shell, and a positioning hole used for being matched with the positioning column is arranged on the control circuit board.

Through adopting above-mentioned technical scheme, when installation control circuit board, match locating hole and reference column and place to increase the accuracy of control circuit board installation. Meanwhile, the positioning column can play a limiting role in the control circuit board, and the shaking of the control circuit board is reduced when the positioning column is used.

Optionally, a clamping portion is arranged in the rear cover and used for clamping the lead.

Through adopting above-mentioned technical scheme, after the lead wire wears to establish and covers after, joint portion can carry out the joint to the lead wire and fix to guarantee to have good fixed action between lead wire and the back lid, improve the electric connection effect between lead wire and the control circuit board.

Optionally, a mounting hole is formed in the housing, a threaded sleeve is arranged in the mounting hole, and the threaded sleeve and the housing are clamped and fixed.

Through adopting above-mentioned technical scheme, the fixed screw thread sleeve of joint on laser sensor's shell, accessible bolt is fixed laser sensor installation when using. Meanwhile, the threaded sleeves are clamped, so that abrasion of the shell by the bolts can be reduced, and the service life is prolonged.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the oblique opening surface is arranged on the window sheet, so that the phenomenon that two light spots are easy to appear when laser passes through the window sheet is reduced, the influence of the two light spots on a detection result is reduced, and the detection precision is improved;

2. the frosted layer around the bevel face prevents stray light from being emitted from the shell, and the interference of the stray light on detection is reduced;

3. the adjusting bolt drives the support to move, so that the position of the lens is changed, and the position of the lens can be adjusted more accurately.

Drawings

Fig. 1 is an overall configuration diagram of a background suppression type laser sensor according to an embodiment of the present application.

Fig. 2 is an exploded view of a background suppression laser sensor according to an embodiment of the present application.

Fig. 3 is an internal structural view of a front case in a background suppression type laser sensor according to an embodiment of the present application.

Fig. 4 is a schematic view illustrating an installation of the inside of the back cover in the background suppression type laser sensor according to the embodiment of the present application.

Fig. 5 is a schematic structural diagram of a window sheet in a background suppression type laser sensor according to an embodiment of the present application.

Fig. 6 is a schematic cross-sectional view of a window sheet in a background-suppressed laser sensor according to an embodiment of the present application.

Fig. 7 is a schematic view illustrating an installation of the inside of a front housing in a background suppression type laser sensor according to an embodiment of the present application.

Description of reference numerals: 1. a housing; 11. a front housing; 111. a positioning column; 12. a rear cover; 121. a clamping part; 122. a lead wire; 123. a light guide pillar; 13. a window sheet; 131. a bevel face; 132. sanding layer; 14. adjusting the bolt; 15. a support; 16. a lens; 17. mounting holes; 18. a threaded sleeve; 2. a laser transmitter; 3. a laser receiver; 4. a control circuit board; 41. an indicator light; 42. a shield case; 43. and (7) positioning the holes.

Detailed Description

The present application is described in further detail below with reference to the accompanying drawings.

The embodiment of the application discloses a background suppression type laser sensor. Referring to fig. 1 and 2, the background suppression type laser sensor includes a housing 1, a laser transmitter 2, a laser receiver 3, and a control circuit board 4, the laser transmitter 2, the laser receiver 3, and the control circuit board 4 are all disposed within the housing 1, and the laser transmitter 2 and the laser receiver 3 are electrically connected to the control circuit board 4, respectively. The housing 1 is provided with a window sheet 13, and the window sheet 13 is used for light to pass through. Laser emitted by the laser emitter 2 irradiates the detection area through the window sheet 13, the laser receiver 3 receives the laser reflected by the detection area, and then the control circuit board 4 analyzes and processes the detection result.

The housing 1 comprises a front shell 11 and a rear cover 12, wherein the front shell 11 and the rear cover 12 are fixedly connected in a sealing way. In this embodiment, the front shell 11 and the rear cover 12 are fixedly connected by an ultrasonic fusion process, which replaces the conventional dispensing assembly process, reduces the assembly time, and improves the production efficiency.

Referring to fig. 2 and 3, a positioning post 111 is provided in the front case 11, and a positioning hole 43 that is engaged with the positioning post 111 is provided on the control circuit board 4. The laser transmitter 2 and the laser receiver 3 are both fixed on the same side of the control circuit board 4. During assembly, the control circuit board 4 is placed on the positioning posts 111, and the stability of the control circuit board 4 is maintained by the fixation between the rear cover 12 and the front case 11. The control circuit board 4 is further provided with a shielding cover 42, and the shielding cover 42 is provided with a through hole for light to pass through. The shielding cover 42 is sleeved on the laser receiver 3 to cover the laser receiver 3, so that the anti-interference capability is improved.

Referring to fig. 2 and 4, a clip portion 121, a lead wire 122, and a light guide post 123 are provided on the rear cover 12. The rear cover 12 is provided with a through hole, the lead 122 is inserted into the through hole, and the lead 122 is electrically connected to the control circuit board 4. The clamping portion 121 is disposed at a position close to the through hole inside the rear cover 12, and the clamping portion 121 clamps and fixes the lead 122. The clamping portion 121 is a cylindrical structure with a notch, and when the lead 122 passes through the clamping portion 121, the clamping portion 121 clamps the lead 122, so that the lead 122 and the rear cover 12 are kept to be fixed well, and the connection stability between the lead 122 and the control circuit board 4 is improved. The light guide post 123 is fixed on the side of the rear cover 12 away from the front case 11, and the light guide post 123 is penetrated in the rear cover 12.

An indicator lamp 41 is arranged on the control circuit board 4, and the indicator lamp 41 is electrically connected with the control circuit board 4. The indicator lamp 41 may emit light when energized and operating. In this embodiment, the indicator 41 is located in the projection range of the light guide column 123 on the control circuit board 4, so that the light can be emitted through the light guide column 123 in time when the indicator 41 emits light, and the working state of the laser sensor can be reminded in time.

With continued reference to fig. 1 and 2, the window sheet 13 is fixed on the front case 11, the window sheet 13 and the front case 11 are fixed by dispensing, and the window sheet 13 is fixed on the side of the front case 11 away from the opening. The window sheet 13 is made of a transparent material to allow light to pass therethrough.

Referring to fig. 5 and 6, bezel surfaces 131 are provided on both opposite sides of the window sheet 13, respectively. Specifically, the bezel surface 131 is formed by grooving the window sheet 13, two bezel surfaces 131 are parallel to each other, and an included angle between the bezel surface 131 and a side surface where the bezel surface 131 is located is an acute angle. When the laser passes through the window sheet 13, the laser is refracted in the window sheet 13, and the phenomenon that the laser is reflected back and forth in the window sheet 13 is reduced. Compared with the prior art in which the laser vertically irradiates the window sheet 13, the phenomenon of generating two points of photoelectricity in the detection area can be avoided to a greater extent.

When the window piece 13 is mounted on the front case 11, the projection range of the bezel surface 131 on the control circuit board 4 covers the projection range of the laser emitter 2 on the control circuit board 4. When the laser is emitted, the laser can be completely emitted from the bevel face 131. The two opposite side surfaces of the window sheet 13 are further provided with frosted layers 132, and the projection range of the frosted layers 132 on the control circuit board 4 is larger than the projection range of the bevel face 131 on the control circuit board 4, that is, the groove digging part where the bevel face 131 is located at the middle position of the frosted layers 132. When the laser is emitted from the bevel face 131, the frosted layer 132 can block the passage of stray light, thereby improving the detection result.

Referring to fig. 2 and 7, a bracket 15 and a lens 16 are further provided in the housing 1, the lens 16 is fixed to the bracket 15, the bracket 15 is slidable in the front housing 11, and the sliding direction of the bracket 15 is the same as the extending direction of the line between the laser transmitter 2 and the laser receiver 3.

The bracket 15 is slidably disposed between the window piece 13 and the laser receiver 3, and an adjusting bolt 14 is rotatably disposed on a side wall of the front housing 11, and the adjusting bolt 14 is threadedly coupled with the bracket 15. By turning the adjusting bolt 14, the bracket 15 can be driven to slide in the front shell 11, and the positions of the bracket 15 and the lens 16 can be adjusted. In the present embodiment, the holder 15 and the lens 16 are disposed between the window sheet 13 and the laser receiver 3. In this embodiment, the adjusting bolt 14 and the front shell 11 are limited by means of a snap, so that the adjusting bolt 14 is prevented from falling off from the front shell 11.

The lens 16 is a hemispherical lens 16, and an included angle between an optical axis of the lens 16 and a photosensitive surface of the laser receiver 3 is an acute angle. In this embodiment, the plane on the support 15 for placing the lens 16 and the plane on the control circuit board 4 are inclined to keep the received light to pass through the optical axis of the lens 16 more, so that the light converging effect is better.

The housing 1 is also provided with a mounting hole 17 and a threaded sleeve 18. Specifically, mounting holes 17 are provided at both end points of the front case 11 away from the rear cover 12, and threaded sleeves 18 are snap-fitted into the mounting holes 17. In use, the laser sensor is conveniently mounted by the threaded fit of the bolt and the threaded sleeve 18. And the threaded sleeve 18 is clamped in the mounting hole 17, so that the abrasion to the front shell 11 can be reduced when the mounting is carried out through bolts.

The implementation principle of the embodiment of the application is as follows: the laser beam is emitted by the laser emitter 2, and the component light irradiated at the rear part of the detection area is reflected and detected by the laser receiver 3. By arranging the bevel face 131 on the window sheet 13, the path of the laser on the window sheet 13 is changed in the laser emitting process, so that the phenomenon that two points of light spots appear after the laser passes through the window sheet 13 is reduced, and the detection precision is greatly improved; the frosted layer 132 on the window sheet 13 can shield stray light, so that the detection is prevented from being greatly influenced by the stray light; drive support 15 through adjusting bolt 14 and remove in preceding shell 11 to adjust lens 16's position, when being directed against different detection distance, the position of gathering through lens 16 when can accurate adjustment laser reflection returns.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A background-suppressed laser sensor, characterized by: the laser device comprises a shell (1), a laser transmitter (2), a laser receiver (3) and a control circuit board (4), wherein the laser transmitter (2), the laser receiver (3) and the control circuit board (4) are all arranged in the shell (1), and the transmitter and the laser receiver (3) are respectively and electrically connected with the control circuit board (4); the shell (1) is provided with a window sheet (13) for light to pass through, and two opposite side surfaces of the window sheet (13) are respectively provided with an inclined opening surface (131); the included angle between the bevel face (131) and the side face where the bevel face (131) is located is an acute angle, the bevel face (131) is parallel to the bevel face, and the projection range of the bevel face (131) on the control circuit board (4) covers the projection range of the laser emitter (2) on the control circuit board (4).

2. A background-suppressed laser sensor according to claim 1, characterized in that: the side face where the bevel face (131) is located is further provided with a frosting layer (132), and the projection range of the frosting layer (132) on the control circuit board (4) covers the projection range of the bevel face (131) on the control circuit board (4).

3. A background-suppressed laser sensor according to claim 1, characterized in that: be provided with adjusting bolt (14), support (15) and lens (16) in shell (1), adjusting bolt (14) rotate to be set up on the lateral wall of shell (1), support (15) with adjusting bolt (14) threaded connection, support (15) with shell (1) slide the setting, support (15) set up window piece (13) with between laser receiver (3), lens (16) are fixed on support (15).

4. A background-suppressed laser sensor according to claim 3, characterized in that: and an included angle between the optical axis of the lens (16) and the light-sensitive surface of the laser receiver (3) is an acute angle.

5. A background-suppressed laser sensor according to claim 1, characterized in that: be provided with shield cover (42) on control circuit board (4), shield cover (42) cover is established on laser receiver (3), be provided with the through-hole that supplies light to pass on shield cover (42).

6. A background-suppressed laser sensor according to claim 1, characterized in that: the shell (1) comprises a front shell (11) and a rear cover (12), and the front shell (11) and the rear cover (12) are fixedly connected in a sealing manner; the window sheet (13) is arranged on the front shell (11) in a sealing mode, a lead (122) penetrates through the rear cover (12), and the lead (122) is electrically connected with the control circuit board (4).

7. A background-suppressed laser sensor according to claim 6, characterized in that: the rear cover (12) is further provided with a light guide column (123), the control circuit board (4) is provided with an indicator lamp (41), the indicator lamp (41) is electrically connected with the control circuit board (4), and the indicator lamp (41) is located in the projection range of the control circuit board (4) of the light guide column (123).

8. A background-suppressed laser sensor according to claim 6, characterized in that: a positioning column (111) is arranged in the front shell (11), and a positioning hole (43) matched with the positioning column (111) is formed in the control circuit board (4).

9. A background-suppressed laser sensor according to claim 6, characterized in that: be provided with joint portion (121) in back lid (12), joint portion (121) are used for the joint lead wire (122).

10. A background-suppressed laser sensor according to claim 1, characterized in that: the improved shell structure is characterized in that a mounting hole (17) is formed in the shell (1), a threaded sleeve (18) is arranged in the mounting hole (17), and the threaded sleeve (18) and the shell (1) are clamped and fixed.