Compact polarization filtering switching device

Abstract

The invention provides a compact polarization filtering switching device, and belongs to the technical field of optical machines. The switching frame is rotationally installed on the base, a polaroid and an optical filter are installed on the switching frame, the axis of the polaroid, the axis of the optical filter and a rotating shaft of the switching frame are parallel to one another and are arranged at intervals, and the polaroid and the optical filter are arranged at intervals; the first driving mechanism is mounted on the base and used for driving the switching frame to rotate relative to the base, so that the polaroid or the optical filter is located in an optical path of the optical system; wherein the polaroid is installed on the switching frame through a rotating ring, the rotating ring is rotatably installed on the switching frame through a bearing, and a second driving mechanism for driving the rotating ring to rotate is arranged on the switching frame and used for adjusting the angle of the polaroid. According to the processing scheme of the invention, the rapid switching of the polarization filtering function is realized, and the adjustment of the angle of the polaroid is realized at the same time.

Description

Technical Field

[0001] The present application relates to the field of optical machines, and in particular to a compact polarization filter switching device. Background Art

[0002] Infrared detection technology is widely used due to its advantages of passive detection, day and night use, and insensitivity to target color. However, in some complex environments, such as haze, the target's infrared radiation signal will be seriously interfered, making it impossible to effectively detect the target.

[0003] Compared with traditional infrared imaging, infrared polarization imaging can detect the polarization characteristics of the target in the infrared band, and has the advantages of strong penetration and anti-interference ability, and its application demand is gradually expanding. In infrared polarization imaging, polarizers with different polarization directions are often placed in the infrared light path to achieve the acquisition and resolution of infrared detection information in different polarization directions. In addition to polarization imaging, it is often necessary to set filters of corresponding bands in front of the imaging device in order to take into account the imaging quality of the infrared optical system under different ambient light and different bands.

[0004] In order to detect different target objects and cope with changing usage environments, it is an effective solution to switch polarizers and filters in time in the same optical system. At present, infrared polarization filter switching mechanisms mostly use two sets of motion mechanisms to independently control the switching of polarizers and filters, which has problems such as complex motion mechanisms and large structural space dimensions. In addition, multiple polarizers with different polarization directions are often used to switch in time to achieve infrared detection information acquisition in different polarization directions, which has problems such as slow polarizer direction switching speed and redundant number of optical components used. Summary of the invention

[0005] In view of this, the present application provides a compact polarization filter switching device, which solves the problems in the prior art. The polarizer rotation mechanism and the filter are installed in the same switching frame to achieve rapid switching of the polarization filter function and adjustment of the polarizer angle.

[0006] The present application provides a compact polarization filter switching device that adopts the following technical solution:

[0007] A compact polarization filter switching device, comprising:

[0008] A base, used to mount the lens assembly of the optical system;

[0009] A switching frame is rotatably mounted on the base, a polarizing plate and a filter are mounted on the switching frame, the axis of the polarizing plate, the axis of the filter and the rotating shaft of the switching frame are parallel to each other and are spaced apart, and the polarizing plate and the filter are spaced apart;

[0010] A first driving mechanism, mounted on the base, for driving the switching frame to rotate relative to the base so that the polarizer or filter is located in the optical path of the optical system;

[0011] The polarizer is mounted on the switching frame via a rotating ring, the rotating ring is rotatably mounted on the switching frame via a bearing, and a second driving mechanism for driving the rotating ring to rotate is provided on the switching frame to adjust the angle of the polarizer.

[0012] Optionally, the rotating ring is a ring gear, and the second driving mechanism includes a first motor, a first gear and a transition gear, the first motor is mounted on a switching frame, the first gear is mounted on an output shaft of the first motor, the transition gear is rotatably mounted on the switching frame, the first gear is meshed with the transition gear, and the transition gear is meshed with the ring gear.

[0013] Optionally, the gear ring is rotatably connected to the switching frame via a bearing, the gear ring is fixed to the inner ring of the bearing via an inner pressure ring, the outer ring of the bearing is fixed to the switching frame via an outer pressure ring, a first ring stage and a second ring stage are provided on the inner wall of the gear ring, the first ring stage and the second ring stage are spaced apart, the polarizer is located between the first ring stage and the second ring stage, one side surface of the polarizer abuts against an end surface of the first ring stage facing the second ring stage, a fixed pressure ring is provided on the side of the polarizer away from the first ring stage, one end of the fixed pressure ring abuts against the outer edge of the polarizer, and one end of the fixed pressure ring abuts against the end surface of the second ring stage facing the first ring stage.

[0014] Optionally, a line connecting the axis of the polarizer and the rotation axis of the switching frame is a first line, a line connecting the axis of the filter and the rotation axis of the switching frame is a second line, and an angle between the first line and the second line is less than 120°.

[0015] Optionally, the base is provided with a first limiting structure and a second limiting structure, and the switching frame is provided with a third limiting structure and a fourth limiting structure, and when the filter rotates from outside the optical path of the optical system to inside the optical path of the optical system, the first limiting structure and the third limiting structure abut against each other, thereby limiting the switching frame from continuing to rotate;

[0016] When the polarizer rotates from outside the optical path of the optical system to inside the optical path of the optical system, the second limiting structure and the fourth limiting structure abut against each other to limit the switching frame from continuing to rotate.

[0017] Optionally, the base is provided with a first magnet arranged close to the first limiting structure and a second magnet arranged close to the second limiting structure, the first magnet is used to generate an adsorption force on the third limiting structure when the first limiting structure and the third limiting structure abut against each other, and the second magnet is used to generate an adsorption force on the fourth limiting structure when the second limiting structure and the fourth limiting structure abut against each other.

[0018] Optionally, the first driving mechanism includes a second motor and a sector gear, the sector gear is fixedly connected to the switching frame, the sector gear and the switching frame have coaxial rotating shafts, a second gear is provided on the output shaft of the second motor, and the second gear is meshed with the sector gear.

[0019] In summary, this application includes the following beneficial technical effects:

[0020] The present application installs the polarizer rotating mechanism and the filter in the same switching frame to realize the rapid switching of the polarization filtering function; utilizes the second driving mechanism that drives the polarizer to rotate, and realizes the stepless change and universal rotation of the polarization direction through a single polarizer; adopts the form of mechanical limit plus magnet adsorption locking to realize position retention and ensure the accuracy of the position; the polarizer rotating mechanism and the polarization filtering switching mechanism can act at the same time to shorten the switching time. The mechanism has the characteristics of compact structure, rapid switching, high accuracy of position and self-locking, and at the same time, on the basis of the existing configuration, it can realize the expansibility of more functions by adding optical elements. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the overall structure of the compact polarization filter switching device of the present application;

[0023] Figure 2 This is a schematic diagram of the structure of the filter of this application located in the optical path of the optical system;

[0024] Figure 3 This is a schematic diagram of the structure of the gear ring and the switching frame of this application;

[0025] Figure 4 This is a schematic diagram of the structure of the second driving mechanism of the present application;

[0026] Figure 5 This is a schematic diagram of the structure of the polarizer and gear ring of this application;

[0027] Figure 6 This is a schematic diagram of the structure in which the polarizer of the present application is located in the light path of the optical system.

[0028] Explanation of the accompanying drawings: 1. base; 2. switching frame; 3. polarizer; 4. filter; 5. first drive mechanism; 51. second motor; 52. sector gear; 53. second gear; 6. gear ring; 61. bearing; 62. inner pressure ring; 63. outer pressure ring; 64. first ring platform; 65. second ring platform; 66. fixed pressure ring; 7. second drive mechanism; 71. first motor; 72. first gear; 73. transition gear; 8. first limiting structure; 81. third limiting structure; 82. first magnet; 83. first lever; 84. first micro switch; 9. second limiting structure; 91. fourth limiting structure; 92. second magnet; 93. second lever; 94. second micro switch. DETAILED DESCRIPTION

[0029] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0030] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0031] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0032] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show the components related to the present application rather than being drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0033] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0034] An embodiment of the present application provides a compact polarization filter switching device.

[0035] like Figure 1 and Figure 2 As shown, a compact polarization filter switching device comprises:

[0036] The base 1 is used for installing the lens group of the optical system.

[0037] The switching frame 2 is rotatably mounted on the base 1, and a polarizing plate 3 and a filter 4 are mounted on the switching frame 2. The axis of the polarizing plate 3, the axis of the filter 4 and the rotating shaft of the switching frame 2 are parallel to each other and are spaced apart, and the polarizing plate 3 and the filter 4 are spaced apart.

[0038] The first driving mechanism 5 is mounted on the base 1 and is used to drive the switching frame 2 to rotate relative to the base 1 so that the polarizer 3 or the filter 4 is located in the optical path of the optical system.

[0039] The polarizer 3 is mounted on the switching frame 2 via a rotating ring, and the rotating ring is rotatably mounted on the switching frame 2 via a bearing 61. The switching frame 2 is provided with a second driving mechanism 7 for driving the rotating ring to rotate, so as to adjust the angle of the polarizer 3.

[0040] like Figure 2 and Figure 3 As shown, the first driving mechanism 5 includes a second motor 51 and a sector gear 52. The sector gear 52 is fixedly connected to the switching frame 2. The sector gear 52 and the switching frame 2 are coaxial with each other. A second gear 53 is provided on the output shaft of the second motor 51. The second gear 53 is meshed with the sector gear 52.

[0041] like Figure 3 and Figure 4 As shown, the rotating ring is a ring gear 6, and the second driving mechanism 7 includes a first motor 71, a first gear 72 and a transition gear 73. The first motor 71 is mounted on the switching frame 2, the first gear 72 is mounted on the output shaft of the first motor 71, and the transition gear 73 is rotatably mounted on the switching frame 2. The first gear 72 and the transition gear 73 are meshed, and the transition gear 73 and the ring gear 6 are meshed.

[0042] like Figure 5As shown, the gear ring 6 is rotatably connected to the switching frame 2 through a bearing 61, the gear ring 6 is fixed to the inner ring of the bearing 61 through an inner pressure ring 62, the outer ring of the bearing 61 is fixed to the switching frame 2 through an outer pressure ring 63, a first ring stage 64 and a second ring stage 65 are provided on the inner wall of the gear ring 6, the first ring stage 64 and the second ring stage 65 are arranged at intervals, the polarizer 3 is located between the first ring stage 64 and the second ring stage 65, one side of the polarizer 3 abuts against one end face of the first ring stage 64 facing the second ring stage 65, a fixed pressure ring 66 is provided on the side of the polarizer 3 away from the first ring stage 64, one end of the fixed pressure ring 66 abuts against the outer edge of the polarizer 3, and one end of the fixed pressure ring 66 abuts against the end face of the second ring stage 65 facing the first ring stage 64. Wherein, the bearing 61 is a rolling bearing 61.

[0043] The axis line of the polarizer 3 and the rotation axis of the switching frame 2 is the first line, the axis line of the filter 4 and the rotation axis of the switching frame 2 is the second line, and the angle between the first line and the second line is less than 120°; in the embodiment of the present application, the angle between the first line and the second line is 60°.

[0044] like Figure 1 , Figure 2 and Figure 6 As shown, the base 1 is provided with a first limiting structure 8 and a second limiting structure 9 , and the switching frame 2 is provided with a third limiting structure 81 and a fourth limiting structure 91 .

[0045] like Figure 1 and Figure 2 As shown, when the filter 4 rotates from outside the optical path of the optical system to inside the optical path of the optical system, the first limiting structure 8 and the third limiting structure 81 abut against each other, limiting the switching frame 2 from continuing to rotate, thereby ensuring the positioning accuracy of the filter 4.

[0046] like Figure 6 As shown, when the polarizer 3 rotates from outside the optical path of the optical system to inside the optical path of the optical system, the second limiting structure 9 and the fourth limiting structure 91 abut against each other, limiting the switching frame 2 from continuing to rotate, thereby ensuring the positioning accuracy of the polarizer 3.

[0047] like Figure 1 , Figure 2 and Figure 6 As shown, the base 1 is provided with a first magnet 82 disposed close to the first limiting structure 8 and a second magnet 92 disposed close to the second limiting structure 9 .

[0048] like Figure 1 and Figure 2As shown, the first magnet 82 is used to generate an adsorption force on the third limiting structure 81 when the first limiting structure 8 and the third limiting structure 81 are in contact with each other, and there is a gap between the first magnet 82 and the third limiting structure 81 .

[0049] like Figure 6 As shown, the second magnet 92 is used to generate an adsorption force on the fourth limiting structure 91 when the second limiting structure 9 and the fourth limiting structure 91 are in contact, and there is a gap between the second magnet 92 and the fourth limiting structure 91; wherein the third limiting structure 81 coupled with the fourth limiting structure 91 is made of steel. The magnet's adsorption force on the upper limiting structure of the switching frame 2 stabilizes the position of the switching frame 2 after it stops in place, and at the same time, there is a gap between the magnet and the limiting structure to prevent the limiting structure on the switching frame 2 from colliding with the magnet, causing damage to the magnet.

[0050] In one embodiment, Figure 1 , Figure 2 and Figure 6 As shown, the switching frame 2 is provided with a first lever 83 and a second lever 93 , and the base 1 is provided with a first micro switch 84 and a second micro switch 94 .

[0051] like Figure 1 and Figure 2 As shown, the filter 4 is located in the optical path of the optical system. When the first limiting structure 8 and the third limiting structure 81 are in contact, the first lever 83 presses the first micro switch 84 to realize the electrical signal feedback after being in place, and the first driving mechanism 5 stops driving the switching frame 2 to rotate.

[0052] like Figure 6 As shown, when the polarizer 3 is located in the optical path of the optical system and the second limiting structure 9 and the fourth limiting structure 91 are in contact, the second lever 93 presses the second micro switch 94 to realize the feedback of the electrical signal after being in place, and the first driving mechanism 5 stops driving the switching frame 2 to rotate.

[0053] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A compact polarization filter switching device, characterized in that: include: A base (1) for mounting a lens assembly of an optical system; A switching frame (2) is rotatably mounted on the base (1), a polarizing plate (3) and a filter (4) are mounted on the switching frame (2), the axis of the polarizing plate (3), the axis of the filter (4) and the rotating shaft of the switching frame (2) are parallel to each other and are arranged at intervals, and the polarizing plate (3) and the filter (4) are arranged at intervals; A first driving mechanism (5) is mounted on the base (1) and is used to drive the switching frame (2) to rotate relative to the base (1) so that the polarizing plate (3) or the filter (4) is located in the optical path of the optical system; The polarizing plate (3) is mounted on the switching frame (2) via a rotating ring, the rotating ring is rotatably mounted on the switching frame (2) via a bearing (61), and the switching frame (2) is provided with a second driving mechanism (7) for driving the rotating ring to rotate, so as to adjust the angle of the polarizing plate (3).

2. The compact polarization filter switching device according to claim 1, characterized in that: The rotating ring is a gear ring (6), and the second driving mechanism (7) comprises a first motor (71), a first gear (72) and a transition gear (73); the first motor (71) is mounted on a switching frame (2), the first gear (72) is mounted on an output shaft of the first motor (71), the transition gear (73) is rotatably mounted on the switching frame (2), the first gear (72) and the transition gear (73) are meshed, and the transition gear (73) and the gear ring (6) are meshed.

3. The compact polarization filter switching device according to claim 2, characterized in that: The gear ring (6) is rotatably connected to the switching frame (2) via a bearing (61); the gear ring (6) is fixed to the inner ring of the bearing (61) via an inner pressure ring (62); the outer ring of the bearing (61) is fixed to the switching frame (2) via an outer pressure ring (63); a first ring stage (64) and a second ring stage (65) are provided on the inner wall of the gear ring (6); the first ring stage (64) and the second ring stage (65) are arranged at intervals; the polarizing plate (3) is located between the first ring stage (64) and the second ring stage (65); one side of the polarizing plate (3) abuts against one end surface of the first ring stage (64) facing the second ring stage (65); a fixed pressure ring (66) is provided on the side of the polarizing plate (3) away from the first ring stage (64); one end of the fixed pressure ring (66) abuts against the outer edge of the polarizing plate (3); and one end of the fixed pressure ring (66) abuts against the end surface of the second ring stage (65) facing the first ring stage (64).

4. The compact polarization filter switching device according to claim 1, characterized in that: The line connecting the axis of the polarizing plate (3) and the rotating axis of the switching frame (2) is a first line, the line connecting the axis of the filter (4) and the rotating axis of the switching frame (2) is a second line, and the angle between the first line and the second line is less than 120°.

5. The compact polarization filter switching device according to claim 1, characterized in that: The base (1) is provided with a first limiting structure (8) and a second limiting structure (9), and the switching frame (2) is provided with a third limiting structure (81) and a fourth limiting structure (91); when the optical filter (4) rotates from outside the optical path of the optical system to inside the optical path of the optical system, the first limiting structure (8) and the third limiting structure (81) abut against each other, thereby limiting the switching frame (2) from continuing to rotate; When the polarizing plate (3) rotates from outside the optical path of the optical system to inside the optical path of the optical system, the second limiting structure (9) and the fourth limiting structure (91) abut against each other, thereby limiting the switching frame (2) from continuing to rotate.

6. The compact polarization filter switching device according to claim 5, characterized in that: The base (1) is provided with a first magnet (82) arranged close to the first limiting structure (8) and a second magnet (92) arranged close to the second limiting structure (9); the first magnet (82) is used to generate an adsorption force on the third limiting structure (81) when the first limiting structure (8) and the third limiting structure (81) are in contact; the second magnet (92) is used to generate an adsorption force on the fourth limiting structure (91) when the second limiting structure (9) and the fourth limiting structure (91) are in contact.

7. The compact polarization filter switching device according to claim 1, characterized in that: The first driving mechanism (5) comprises a second motor (51) and a sector gear (52); the sector gear (52) is fixedly connected to the switching frame (2); the rotating shafts of the sector gear (52) and the switching frame (2) are coaxial; a second gear (53) is provided on the output shaft of the second motor (51); the second gear (53) is meshed with the sector gear (52).

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