Laser distance measuring sensor device

Abstract

The invention provides a laser distance measuring sensor device which comprises a laser module, a support, an optical axis adjusting module, an elastic part and a receiving lens, the laser module is installed on the support, the optical axis adjusting module and the elastic part abut against the laser module respectively, and when the optical axis is adjusted, the receiving lens receives the optical axis. The optical axis adjustment module and the elastic part act on the laser module, so that the optical axis direction of the laser module is changed, and optical axis adjustment is achieved. The receiving lens wraps the laser module, so that the focal length of the reflected light is in the light sensing position, the reflected light received by the light sensing position is improved, and blind areas are reduced. The laser distance measuring sensor device has an optical axis adjusting function, and is particularly suitable for small light spot products, small blind areas and remote distance measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of sensor design, and in particular to a laser ranging sensor device. Background Art

[0002] With the development of industrial automation, laser distance sensors are increasingly used, and the detection distance is getting farther and farther. In order to accurately detect objects, a small spot design is generally used. In industrial situations, laser sensors generally use laser modules as the transmitter, which have collimation and a small spot, but the optical axis has a large degree of discreteness. The laser module is composed of a laser tube, a housing, a lens, etc., and the optical axis itself has a certain degree of discreteness. The assembly accuracy of the laser module and the bracket, receiving lens and other modules will also cause the optical axis to shift. When the optical axis shifts, the light will shift. The longer the detection distance, the more serious the light shift. In severe cases, the light is not on the photosensitive device, resulting in the inability to detect the product.

[0003] At present, the laser module and the receiving lens are generally designed separately, with a large distance between them, and the receiving lens will not cover the laser module. In general, the laser module has a small spot, and the emitted light is projected to the target. Most of the reflected light cannot be focused to the photosensitive position by the receiving lens, and the utilization rate of the received light is low. Especially at close distances, the reflected light cannot be focused to the photosensitive position, resulting in the inability to detect the object, which is the blind spot. Summary of the invention

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a laser ranging sensor device with an optical axis adjustment function. The present invention is particularly suitable for small spot products, small blind areas and long-distance ranging.

[0005] To solve the above problems, the technical solution of the present invention is:

[0006] A laser distance measuring sensor device comprises a laser module, a bracket, an optical axis adjustment module, an elastic part and a receiving lens, wherein the laser module is mounted on the bracket, the optical axis adjustment module and the elastic part respectively support the laser module, and when the optical axis is adjusted, the optical axis adjustment module and the elastic part act on the laser module respectively, thereby changing the direction of the optical axis of the laser module and realizing optical axis adjustment; the receiving lens wraps the laser module, which is beneficial for the focal length of the reflected light to be at a photosensitive position, thereby increasing the reflected light received at the photosensitive position and reducing the blind area.

[0007] Preferably, the optical axis adjustment module includes three screws arranged on the upper, lower and right parts of the bracket. The three screws on the upper, lower and right parts of the bracket are aligned with the tail of the laser module, and the left part supports the laser module through elastic parts. When adjusting the optical axis, the screws are rotated respectively, and the screws apply thrust forward to the tail of the laser module, thereby changing the direction of the optical axis of the laser module to achieve optical axis adjustment.

[0008] Preferably, after adjusting the optical axis of the laser module, the laser module and the screws are fixed by glue.

[0009] Preferably, a limit block for limiting movement is provided at the front end of the laser module.

[0010] Preferably, the optical axis adjustment module uses positioning columns and riveting to adjust the optical axis.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The present invention adopts a design in which the receiving lens wraps the laser module, so that the reflected light of the small spot product is focused on the photosensitive device through the receiving lens, which can reduce the blind area especially at close distance.

[0013] 2. The present invention adjusts the optical axis direction of the laser module by rotating the screws from multiple directions to achieve optical axis adjustment and ensure that the optical axis is not offset. After adjusting the optical axis, the laser module and the screws are fixed with glue to ensure that at a long distance, the reflected light is focused on the light-sensitive position, so that a longer distance can be detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0015] Figure 1 This is a structural diagram of the laser ranging sensor device of the present invention;

[0016] Figure 2 A receiving lens structure diagram for a laser ranging sensor device;

[0017] Figure 3 This is a schematic diagram of adjusting the optical axis of the laser module;

[0018] Figure 4 Schematic diagram of the light from the receiving lens wrapping the laser module. DETAILED DESCRIPTION

[0019] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0020] Specifically, the present invention provides a laser ranging sensor device, such as Figure 1 and Figure 2As shown, the laser distance sensor device includes a laser module, a bracket, an optical axis adjustment module, an elastic part and a receiving lens. The laser distance sensor generally adopts the TOF principle, that is, the time-of-flight ranging method, which calculates the distance between the emitter and the reflector by measuring the time between the emitter and the reflector.

[0021] like Figure 3 As shown, the optical axis offset of the laser module is possible in four directions. In this embodiment, the laser module is installed on the bracket, and the optical axis adjustment module includes three screws arranged on the upper, lower and right parts of the bracket. The three screws on the upper, lower and right parts of the bracket are aligned with the tail of the laser module. The left part supports the laser module through elastic parts. Under normal circumstances, the elastic parts are redundant and will push the laser module to the right. When adjusting the optical axis, the screws are rotated respectively, and the screws apply thrust forward to the tail of the laser module. Since the front end of the laser module is restricted by the limit block, the direction of the optical axis of the laser module is changed. First, rotate the screw on the right to the left to adjust the optical axis to be non-deflected in the left and right directions. Then adjust to the up and down direction of the optical axis. If the optical axis is deflected downward, rotate the screw on the upper part of the bracket downward to move the optical axis upward; conversely, if the optical axis is deflected upward, rotate the screw on the lower part of the bracket upward to move the optical axis downward. After adjusting the optical axis, fix the laser module and screws with glue. The screws are rotated in three directions respectively to adjust the direction of the optical axis of the laser module. The present invention can also adopt other optical axis adjustment methods, such as adjusting the optical axis by positioning columns, riveting, etc.

[0022] like Figure 4 As shown, the receiving lens wraps the laser module, and when the emission spot is relatively small, it will increase the receiving lens to receive the reflected light, and focus it to the photosensitive position through the receiving lens. When the spot is small, the photosensitive size is small, if the optical axis is not offset, even if the target is close or far away, it can ensure that the emitted light can be effectively focused on the photosensitive position through the reflected light of the receiving lens.

[0023] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A laser ranging sensor device, characterized in that: The device includes a laser module, a bracket, an optical axis adjustment module, an elastic part and a receiving lens. The laser module is installed on the bracket. The optical axis adjustment module and the elastic part respectively support the laser module. When the optical axis is adjusted, the optical axis adjustment module and the elastic part act on the laser module respectively, thereby changing the direction of the optical axis of the laser module and realizing optical axis adjustment. The receiving lens wraps the laser module, which is conducive to the focal length of the reflected light at the photosensitive position, thereby increasing the reflected light received at the photosensitive position and reducing the blind area.

2. The laser ranging sensor device according to claim 1, characterized in that: The optical axis adjustment module includes three screws arranged on the upper, lower and right parts of the bracket. The three screws on the upper, lower and right parts of the bracket are aligned with the tail of the laser module. The left part supports the laser module through elastic parts. When adjusting the optical axis, the screws are rotated respectively, and the screws apply thrust forward to the tail of the laser module, thereby changing the direction of the optical axis of the laser module to achieve optical axis adjustment.

3. The laser ranging sensor device according to claim 2, characterized in that: After adjusting the optical axis of the laser module, the laser module and the screws are fixed by glue.

4. The laser ranging sensor device according to claim 1, characterized in that: The front end of the laser module is provided with a limit block for limiting movement.

5. The laser ranging sensor device according to claim 1, characterized in that: The optical axis adjustment module uses positioning columns and riveting to adjust the optical axis.

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