CN214201924U

CN214201924U - Image space scanning optical system based on rotary double optical wedges

Info

Publication number: CN214201924U
Application number: CN202120256229.7U
Authority: CN
Inventors: 杨克君; 宇太坤
Original assignee: Harbin Xinguang Photoelectric Technology Co ltd
Current assignee: Harbin Xinguang Photoelectric Technology Co ltd
Priority date: 2021-01-29
Filing date: 2021-01-29
Publication date: 2021-09-14
Anticipated expiration: 2031-01-29

Abstract

The utility model relates to an image space scanning optical system based on rotatory two optical wedges for the scanning mechanism volume of solving prior art is big partially, is difficult to realize the defect of high accuracy, quick scanning. The utility model comprises a telescope optical system, a rotary double optical wedge scanning mechanism and an imaging optical system which are arranged along the light path in sequence; the rotary double-optical-wedge scanning mechanism comprises a first optical wedge and a second optical wedge which are identical in structure, and the first optical wedge and the second optical wedge can realize field scanning through rotation. The first optical wedge and the second optical wedge can be independently rotated for selecting different fields of view. The utility model is suitable for an infrared guidance system.

Description

Image space scanning optical system based on rotary double optical wedges

Technical Field

The utility model relates to an image space scanning optical system field, concretely relates to image space scanning optical system based on rotatory two optical wedges.

Background

In the field of optical imaging technology, optical systems are classified into scanning type and non-scanning type according to scanning mechanisms. Under the influence of aberration and material, a non-scanning infrared optical system generally cannot meet the requirements of a large field of view and a large detection distance at the same time, and a system meeting the requirements of the two fields of view and the large detection distance is complex in structure and large in size. The scanning type infrared optical system may have the following problems: 1. continuous scanning cannot be performed, and a specific view field cannot be selected; 2. a large space is required to be occupied when image space scanning is carried out, for example, in the prior art, a scanning technology for driving a detector to move in a two-dimensional translation or swing needs to reserve a space for the scanning motion of an optical system and the detector, so that the whole volume of the system is large; 3. the driving mechanism for scanning is difficult to realize high precision, so that the resolution and precision of the optical system are lower; 4. the moment of inertia of the parts that need to move during scanning is large, which is not favorable for the scanning speed and precision.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an aim at solving prior art's scanning mechanism volume big partially, be difficult to realize the defect of high accuracy, quick scanning.

According to a first aspect of the present invention, there is provided an image space scanning optical system based on a rotary dual optical wedge, comprising a telescopic optical system, a rotary dual optical wedge scanning mechanism and an imaging optical system, which are sequentially arranged along an optical path; the rotary double-optical-wedge scanning mechanism comprises a first optical wedge and a second optical wedge which are identical in structure, and the first optical wedge and the second optical wedge can realize field scanning through rotation.

Preferably, the first wedge and the second wedge are independently rotatable for selecting different fields of view.

Preferably, at least one reflecting mirror is further included between the rotary dual-optical-wedge scanning mechanism and the imaging optical system, and is used for deflecting the optical path.

Preferably, the rotating dual wedge scanning mechanism is used to reduce the moment of inertia.

Preferably, the rotating dual-wedge scanning mechanism is used for reducing the space occupied during scanning.

Preferably, the first optical wedge and the second optical wedge are driven by a first motor and a second motor respectively to rotate.

Preferably, the image space scanning optical system based on the rotating dual wedges further comprises a controller for calculating a desired deflection angle and controlling the first and second motors to rotate the first and second wedges to a specified angle to receive a specified field of view.

The utility model has the advantages that: 1. the image space scanning system is improved by adopting a double-optical-wedge scanning mechanism, and a new technical route different from the prior art is provided; 2. scanning is performed in a double-optical-wedge rotating mode, continuous scanning is achieved, and the rotational inertia of the optical wedges is small; 3. the scanning can be controlled by a high-precision motor, so that high precision and high resolution can be realized; 4. the double optical wedges respectively rotate independently and can receive a specified view field; 5. the optical wedge does not occupy extra volume when rotating, and the miniaturization of the device is facilitated.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic structural diagram of an embodiment of an image space scanning optical system based on a rotating dual optical wedge according to the present invention;

FIG. 2 is a schematic view of the position of the rotating dual wedge scanning mechanism at which the maximum total deflection angle is produced;

FIG. 3 is a schematic view of the position of the rotating dual wedge scanning mechanism that produces the minimum total deflection angle.

Description of reference numerals: 1-a telescopic optical system; 2-rotating the double-optical-wedge scanning mechanism; 3-an imaging optical system; 4-a detector; 5-a reflector; 2A-a first wedge optic; 2B-second wedge optic.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

The utility model provides an image space scanning optical system based on a rotary double optical wedge, as shown in figure 1, comprising a telescopic optical system 1, a rotary double optical wedge scanning mechanism 2 and an imaging optical system 3 which are arranged along the light path in sequence; the rotary double-optical-wedge scanning mechanism 2 comprises a first optical wedge 2A and a second optical wedge 2B which are identical in structure, and the first optical wedge 2A and the second optical wedge 2B can realize field scanning through rotation.

The principle of the present invention can be explained with reference to fig. 2 and 3, and the dual optical wedge is composed of two optical flat glasses with a certain wedge angle, and the front surface of the optical wedge is vertically incident to the light beam, and the light beam is emitted from the rear surface to generate a certain deviation angle. In combination with two independent rotating wedges, the resulting light rays will rotate to a new angle or will translate over a cone scan range corresponding to the wedge angle. The principle that the trend of light rays can be changed by rotating the double optical wedges is utilized, and the light rays are guided to reach a specific position by controlling the rotating angles of the two optical wedges, so that the field of view can be rapidly scanned in a large range. The device can meet the movement requirements of light rays in the directions of azimuth and pitching, the azimuth and the pitching can move continuously, and targets in all angle ranges in a visual field can be observed continuously. The plane of rotation of the dual wedges is substantially perpendicular to the optical path.

In one embodiment, the first optical wedge and the second optical wedge of the present invention can be independently rotated for selecting different fields of view. This has a better effect than the prior art. For example, CN106908955B in the prior art, has a scheme of performing laser beam expansion scanning by rotating two optical wedges, where the two optical wedges rotate in opposite directions at the same speed, and the function is to perform beam expansion scanning according to a certain period, "the same speed rotates in opposite directions" indicates that the rotations of the two optical wedges are correlated and not independent, and the scheme is about laser emission and does not involve the problem of receiving field of view. And the utility model discloses a two optical wedges can independently rotate, can select specific visual field in a flexible way, for example can establish two optical wedge rotation angles and the corresponding relation who receives the visual field, when needs receive specific visual field, drive first optical wedge and second optical wedge and rotate the assigned position to receive appointed visual field. Therefore, the independent rotation of the double optical wedges can solve new technical problems and achieve remarkable technical effects.

Further, the first optical wedge and the second optical wedge can be driven by a first motor and a second motor respectively to rotate. Thus, in one embodiment, the present invention may further include a controller for calculating a desired deflection angle and controlling the first and second motors to rotate the first and second wedges to a specified angle to receive a specified field of view.

The utility model discloses still include at least one speculum 5 between rotatory two optical wedge scanning mechanism and the imaging optical system for the light path turns over. The effect is to reduce the overall size of the optical system.

It should be noted that although the dual-wedge optical elements are optical components that exist in the prior art, the principles and technical details are disclosed in the literature, for example, analysis of refractive characteristics and two-dimensional scanning trajectories of rotating dual-wedges. But the utility model discloses in combine together two optical wedge scanning and image space scanning and realized new utility model purpose, solved new technical problem, realized new technological effect, the concrete embodiment is in following aspect: 1. in an application scenario requiring high-speed scanning, the optical wedge has lower rotational inertia, so that high-speed scanning is more favorably realized through a high-precision motor. 2. Because the optical wedge rotates around the fixed shaft, extra space is not occupied during rotation, and compared with two-dimensional translational scanning, the optical wedge saves space and reduces the volume of equipment. 3. The utility model discloses a scanning is continuous, can acquire the field of view of within range optional position. 4. The utility model provides a new design of image space scanning optical system, because prior art often adopts two optical wedges to realize the angular adjustment among the laser emission process, but do not be applied to the optical receiving system of image space scanning, consequently the utility model provides a new technological inspiration makes two optical wedges fully used in improving image space scanning system.

< example >

As shown in fig. 1 to 3, the image scanning optical system of the present embodiment includes: the device comprises a telescopic optical lens group 1, a scanning mechanism 2, an imaging optical system 3 and a detector 4. The telescopic optical lens group 1 and the imaging optical lens group 3 are in optical path butt joint through a scanning mechanism 2. The telescopic optical lens group 1 is a large-view-field optical lens group, the view field of the telescopic optical lens group covers the tracking view field range, and light beams emitted by scenes in the tracking view field range are collimated by the telescopic optical lens group and then projected to the scanning mechanism. The entrance pupil of the telescopic optical lens group is close to the window, so that the size of the window can be reduced, and the exit pupil is arranged at the scanning mechanism to reduce the size of the optical wedge.

The double optical wedges are driven by the rotating platform to transmit light beams emitted from different object space view fields of the telescopic optical lens group to the imaging optical lens group, so that the functions of image stabilization and tracking are realized. The imaging optical lens group is a small-field optical lens, the field of view covers the range of the apparent field of view, and light beams are focused by the imaging optical lens group and then imaged on a photosensitive surface of the detector to generate an optical image. The optical system and the scanning mechanism jointly realize large aperture and large field of view of the system. The scanning mechanism adopts a rotary double-optical-wedge scanning mode and has the advantages of high resolution, high precision and the like.

The present embodiment is applied to an image space scanning system that needs to have a low moment of inertia, needs high-precision continuous scanning, and needs to be miniaturized. The method can be used in an infrared guidance system, reduces the volume of the infrared guidance system, and can meet the requirements of high resolution, continuous scanning and low rotational inertia.

The embodiment adopts a double-optical-wedge scanning image space scanning imaging optical system, realizes image space scanning by means of double-optical-wedge rotation, ensures compact structure and small size of the whole system, and realizes the requirements of miniaturization and light weight of the optical system; the embodiment scans by controlling the rotation of the double optical wedges, the front group of telescopic optical systems and the rear group of imaging optical lens group are fixed, the rotational inertia is small, and the structure is simple.

The optical system of the embodiment is a large-view-field optical system, light rays of different view fields of the telescopic optical system are imaged on the detector through the imaging optical lens group through the scanning mechanism, and the optical system and the scanning mechanism jointly realize large aperture and large view field of the system.

The scanning mechanism of the embodiment adopts a rotating double-optical-wedge scanning mode, adopts a high-precision control motor, and drives the optical wedges to rotate with high precision and high resolution, so that the image space scanning optical system based on the rotating double-optical-wedge has the advantages of high resolution, high precision and the like.

The double optical wedges are composed of two optical flat glasses with certain wedge angles, light rays vertically enter the front surfaces of the optical wedges and are emitted from the rear surfaces to generate certain deflection angles. In combination with two independent rotating wedges, the resulting light rays will rotate to a new angle or will translate over a cone scan range corresponding to the wedge angle. The rotary double-optical-wedge scheme just meets the friendly requirement of meeting large-view-field scanning under the condition of limited physical space, and because no large-range motion mechanism is arranged, a relay optical element is not required to be added. The principle that the trend of light rays can be changed by rotating the double optical wedges is utilized, and the light rays are guided to reach a specific position by controlling the rotating angles of the two optical wedges, so that the field of view can be rapidly scanned in a large range. The device can meet the movement requirements of light rays in the directions of azimuth and pitching, the azimuth and the pitching can move continuously, and targets in all angle ranges in a visual field can be observed continuously.

The rotary double-optical-wedge scheme just meets the requirement of friendly meeting of large-view-field scanning under the condition of limited physical space, and because no large-range motion mechanism is arranged, a relay optical element is not required to be added.

Although certain specific embodiments of the present invention have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. An image space scanning optical system based on a rotary double-optical wedge is characterized by comprising a telescopic optical system, a rotary double-optical wedge scanning mechanism, an imaging optical system and a detector which are sequentially arranged along an optical path; the rotary double-optical-wedge scanning mechanism comprises a first optical wedge and a second optical wedge which are identical in structure, and the first optical wedge and the second optical wedge can realize field scanning through rotation.

2. The rotating dual wedge-based image scanning optical system of claim 1, wherein the first wedge and the second wedge are independently rotatable for selecting different fields of view.

3. The rotating dual-wedge based image space scanning optical system of claim 1 further comprising at least one mirror between the rotating dual-wedge scanning mechanism and the imaging optical system for folding the optical path.

4. The rotating dual-wedge based image side scanning optical system of claim 1, wherein the rotating dual-wedge scanning mechanism is configured to reduce moment of inertia.

5. The image space scanning optical system based on the rotating double-optical-wedge as claimed in claim 1 or 4, wherein the rotating double-optical-wedge scanning mechanism is used for reducing the space occupied during scanning.

6. The rotating dual wedge-based image scanning optical system of claim 2, wherein the first and second wedges are driven to rotate by first and second motors, respectively.

7. The rotating dual wedge-based image scanning optical system of claim 6, further comprising a controller for calculating a desired deflection angle and controlling the first and second motors to rotate the first and second wedges to a specified angle to receive a specified field of view.