Transmitting-receiving coaxial laser ranging device and optical module

A transmitting-receiving coaxial laser ranging device, comprising a lens barrel, and an objective lens, an ocular lens, an optical module and a ranging assembly, wherein the objective lens, the ocular lens, the optical module and the ranging assembly are mounted on the lens barrel,

• wherein the ranging assembly comprises a laser transmitter, a laser receiver, and a microprocessing module, wherein the microprocessing module is connected to the laser transmitter and the laser receiver;
• the optical module is disposed between the objective lens and the ocular lens along a main optical path and comprises a beam splitting prism group, the beam splitting prism group consists of two beam splitting prisms disposed coaxially along the main optical path, and the two beam splitting prisms respectively correspond to positions of the laser transmitter and the laser receiver, wherein the laser transmitter and the laser receiver are disposed on a side of the main optical path;
• and
• a laser beam emitted by the laser transmitter is partially refracted by a first one of the two beam splitting prisms and converged into the main optical path and is emitted from the objective lens of the lens barrel,
• after the laser beam is irradiated on an object surface, a reflected laser beam and an external visible beam enter from an objective lens end of the lens barrel to a second one of the two beam splitting prisms along the main optical path, and the reflected laser beam is refracted to the laser receiver and received by the laser receiver;
• and
• the external visible beam for imaging is transmitted through the two beam splitting prisms and imaged on a visual imaging surface in front of the ocular lens, wherein a beam splitting bevel of a first beam splitting prism is provided with a beam splitting coating, wherein the external visible beam is allowed to be transmitted through the beam splitting coating and the laser beam is allowed to be transmitted and reflected through the beam splitting coating;
• the beam splitting prism disposed at a transmitting end of the laser transmitter is denoted as the first beam splitting prism, and the beam splitting prism disposed at a receiving end of the laser receiver is denoted as a second beam splitting prism;
• and
• the objective lens, the first beam splitting prism, the second beam splitting prism, and the ocular lens are sequentially and coaxially disposed along the main optical path, or the objective lens, the second beam splitting prism, the first beam splitting prism, and the ocular lens are sequentially and coaxially disposed along the main optical path.