CN-115980978-B - Imaging and ranging optical axis coupling optical system

CN115980978BCN 115980978 BCN115980978 BCN 115980978BCN-115980978-B

Abstract

The invention discloses an optical system for coupling imaging and a ranging optical axis, which comprises a laser emitting module, a composite prism, a common lens group, a rear lens group and a laser receiving module, wherein laser generated by the laser emitting module is guided to the common lens group through the composite prism, the common lens group reflects the laser back to the composite prism to finish laser emission, the composite prism splits the laser, one path of light is guided to the rear lens group to focus and image, and the other path of light is guided to the laser receiving module to range so as to couple the laser emission, the laser receiving and the imaging optical axis. The multifunctional camera product can solve the problems that the existing multifunctional camera product integrates the camera function with one of laser emission or laser receiving to cause more windows, the device is large in size and a complex focusing structure is needed to realize the dual-band focusing of visible light and infrared light.

Inventors

ZHANG JUNFENG
LI JIE
YANG XUEMEI
LI HUAJIN
HAN ZHIGANG
LI KEYU
LIU YAHUI

Assignees

湖北华中长江光电科技有限公司

Dates

Publication Date: 20260505
Application Date: 20221216

Claims (8)

1. An optical system for coupling imaging and ranging optical axis is characterized by comprising a laser emitting module, a compound prism, a shared lens group, a rear lens group and a laser receiving module, wherein, The laser generated by the laser emission module is guided to the shared lens group through the composite prism, and the shared lens group reflects the laser back to the composite prism to finish laser emission; The composite prism is used for splitting laser, one path of light is guided to the rear lens group for focusing imaging, the other path of light is guided to the laser receiving module for distance measurement so as to enable laser emission, laser receiving and imaging to be coupled with each other, the composite prism comprises four right-angle prisms which are mutually bonded, the first right-angle prism and the second right-angle prism are identical in size and are mutually bonded along inclined planes and are used for splitting light according to wave bands, the right-angle surface of the third right-angle prism is bonded with the right-angle surface of the first right-angle prism, and the right-angle surface of the fourth right-angle prism is bonded with the inclined plane of the third right-angle prism, and the area ratio is utilized for splitting light.
2. The optical system of claim 1, wherein the compound prism is disposed between the common lens group and the rear lens group, and a path of light rays transmitted through the first right angle prism in the laser emitted from the common lens group is modulated by the rear lens group to form an image with visible light and infrared light in a focusing manner.
3. The optical system for coupling imaging and ranging optical axis according to claim 2, wherein the laser ranging is performed after the other path of light reflected by the first right angle prism among the laser beams emitted from the common lens group is split by the third right angle prism area.
4. The optical system of claim 1, wherein the common lens group includes a common first cemented lens, a common third cemented lens, and a common second cemented lens, which are sequentially arranged, the common first cemented lens and the common second cemented lens being formed by a biconvex lens and a biconcave lens, the common third lens being a biconvex lens.
5. The optical system of claim 1, wherein the laser emitting module comprises a laser light source and a laser emitting lens disposed opposite the inclined plane of the fourth right angle prism, and the laser receiving module comprises a laser receiving lens, a narrow band filter, and an avalanche diode disposed opposite the right angle plane of the third right angle prism.
6. The optical system of claim 2, wherein the infrared light is near infrared light with a wavelength band of 0.686nm to 0.840 nm.
7. The optical system of claim 4, wherein the common first cemented lens is a biconvex lens made of H-K3, a biconcave lens made of H-ZLAF, the common third lens is a biconvex lens made of H-K3, and the common second cemented lens is a biconcave lens made of H-K3, and a biconvex lens made of H-LAK 50A.
8. The imaging and ranging optical axis-coupled optical system of claim 1, wherein the rear lens group comprises a rear first lens and a rear second lens, the rear first lens being made of H-LAF3 and the rear second lens being made of H-ZF 62.

Description

Imaging and ranging optical axis coupling optical system Technical Field The application relates to the technical field of optical equipment, in particular to an optical system for coupling imaging and a ranging optical axis. Background Along with the continuous development of the photoelectric technology, the multifunctional camera product plays an increasingly important role in practical application, the application range is continuously expanded, higher requirements are put forward on the functions and integration of the multifunctional camera product, and products with miniaturization, high integration, light weight and portability become a development trend. Most of the existing multifunctional camera shooting products integrate three functions of visible light camera shooting, near infrared camera shooting and laser ranging, however, due to the structural difference of laser transmitting and receiving components, the products often integrate the camera shooting function with one of laser transmitting or laser receiving, and the camera shooting function and the laser ranging function cannot be completely integrated in the same light path structure, so that the problems of more windows and larger device size exist. In addition, when near infrared shooting and visible light shooting are integrated, a focusing structure or a special surface is used for realizing dual-band focusing, the former is complex in structure and greatly influenced by environmental temperature, and the latter is high in processing cost and research and development cost. Disclosure of Invention In order to overcome the defects in the prior art, the embodiment of the invention provides an optical system with coupled imaging and ranging optical axes, which can solve the problems that the prior multifunctional camera product integrates the camera function with one of laser emission or laser receiving to cause more windows and larger device volume, and a complex focusing structure is required to realize the dual-band focusing of visible light and infrared light. The invention provides an optical system for coupling imaging and ranging optical axes, which comprises a laser emitting module, a composite prism, a common lens group, a rear lens group and a laser receiving module, wherein laser generated by the laser emitting module is guided to the common lens group through the composite prism, the common lens group reflects the laser back to the composite prism to complete laser emission, the composite prism splits the laser, one path of light is guided to the rear lens group to focus and image, and the other path of light is guided to the laser receiving module to range so as to enable the laser emission, the laser receiving and the imaging to be coupled in three optical axes. In one embodiment of the invention, the composite prism comprises four right-angle prisms bonded with each other, wherein the first right-angle prism and the second right-angle prism are the same in size and are bonded with each other along inclined planes for splitting light according to wave bands, the right-angle surface of the third right-angle prism is bonded with the right-angle surface of the first right-angle prism, and the right-angle surface of the fourth right-angle prism is bonded with the inclined planes of the third right-angle prism, and the area ratio is utilized for splitting light. In an embodiment of the present invention, the compound prism is disposed between the common lens group and the rear lens group, and one path of light transmitted through the first right angle prism in the laser emitted from the common lens group is modulated by the rear lens group to form a focal point image of visible light and infrared light. In one embodiment of the present invention, the laser ranging is performed after the other path of light reflected by the first right angle prism among the laser beams emitted from the common lens group is split by the third right angle prism area. In one embodiment of the present invention, the common lens group includes a common first cemented lens, a common third lens, and a common second cemented lens that are sequentially disposed, where the common first cemented lens and the common second cemented lens are formed by a biconvex lens and a biconcave lens, and the common third lens is a biconvex lens. In one embodiment of the invention, the laser emitting module comprises a laser light source and a laser emitting lens, wherein the laser light source and the laser emitting lens are arranged opposite to the inclined plane of the fourth right-angle prism, and the laser receiving module comprises a laser receiving lens, a narrow-band filter and an avalanche diode, and the laser receiving module is arranged opposite to the right-angle surface of the third right-angle prism. In one embodiment of the present invention, the infrared light is near infrared light with a wavelength band of 0.686nm to 0.840 nm. In one embodiment of the inv