CN212061261U - Lens corner measuring structure, lens assembly and automobile data recorder - Google Patents

Abstract

The utility model relates to a camera lens corner measurement structure, including lens cone, grating dish, light source, detector and angle calculation module. The lens barrel can be fixedly connected with the lens along the rotation direction of the lens. The grating disc is arranged on the lens cone, and the grating disc and the lens cone rotate synchronously. The light source and the detector are oppositely arranged on two sides of the grating disc, and when the grating disc rotates synchronously with the lens cone, the detector receives light rays emitted by the light source and penetrating through the grating disc. And the angle calculation module electrically connected with the detector can calculate and output the rotation angle of the lens. The utility model discloses still relate to a camera lens subassembly and vehicle event data recorder including above-mentioned camera lens corner measurement structure. According to the lens rotation angle measuring structure, the lens assembly and the automobile data recorder, the grating disc can synchronously rotate with the lens, the light source, the detector and the angle calculating module are matched to obtain the rotation angle of the lens by obtaining the rotation angle of the grating disc, so that the automatic obtaining of the rotation angle of the lens is realized, and the lens rotation angle measuring structure has higher measuring precision and measuring stability.

Description

Lens corner measuring structure, lens assembly and automobile data recorder

Technical Field

The utility model relates to a displacement detection technical field especially relates to a camera lens corner measurement structure, camera lens subassembly and vehicle event data recorder.

Background

The image capturing/photographing device can record information such as images and sounds while the vehicle or aircraft is traveling. The accurate shooting visual angle is a precondition for recording information, but the shooting visual angle of the shooting/photographing device is easy to deviate due to initial installation error or vibration or bump in the driving process during driving. Some camera/photographing devices have the function of electrically adjusting the photographing angle of view, but such automobile data recorders still confirm the adjustment of the angle of view manually, and the accuracy is low.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a lens rotation angle measuring structure, a lens assembly, and a driving recorder capable of acquiring a rotation angle, in order to solve the problem of low adjustment accuracy caused by manually confirming and adjusting a viewing angle in the conventional imaging/photographing apparatus.

A lens rotation angle measuring structure comprising:

the lens barrel can be fixedly connected with the lens along the rotation direction of the lens;

the grating disc is arranged on the lens barrel and synchronously rotates with the lens barrel;

the light source and the detector are oppositely arranged on two sides of the grating disc, and when the grating disc rotates synchronously with the lens cone, the detector receives light rays emitted by the light source and penetrating through the grating disc;

and the angle calculation module is electrically connected with the detector and can calculate and output the rotation angle of the lens according to the optical signal received by the detector.

In one embodiment, the grating disc and the lens barrel are fixedly connected through a connecting piece, or the grating disc and the lens barrel are integrally formed.

In one embodiment, the lens barrel comprises a shell, wherein the shell forms a hollow accommodating cavity for accommodating a lens; the shell is provided with a light hole, and the light hole allows light rays to enter the lens.

In one embodiment, the housing comprises an accommodating part and a protruding part, the accommodating part is communicated with the protruding part, the accommodating part and the protruding part are arranged in a surrounding mode to form the accommodating cavity, and the shape of the protruding part is matched with that of a lens; the accommodating part can be fixedly connected with the lens in a detachable mode, one end of the protruding part is connected with the accommodating part, the other end, far away from the accommodating part, of the protruding part is provided with the light hole, and the protruding part can accommodate one end of the lens, which is sensitive to light.

In one embodiment, the lens rotation angle measuring structure further includes a lens holder, one end of the lens, which is far away from the light sensor, is fixedly disposed on the lens holder, the lens holder is disposed in the accommodating portion, and the lens holder is detachably and fixedly connected with the accommodating portion.

In one embodiment, the lens barrel further comprises two connecting shafts, the two connecting shafts are arranged at the rotating center of the lens barrel, and the two connecting shafts are respectively arranged at two ends of the shell along the extending direction of the rotating shaft; the lens corner measuring structure further comprises a shaft pressing plate, the shaft pressing plate abuts against the two connecting shafts, and the shaft pressing plate allows the two connecting shafts to rotate.

In one embodiment, the grating disc is provided with a plurality of light-transmitting slits, the light-transmitting slits are distributed on the grating disc at intervals along concentric arcs, and the central angle of the arc corresponding to the light-transmitting slits is less than or equal to 180 °.

In one embodiment, the grating disk is in a partial pie shape, and the central angle of the grating disk is less than or equal to 180 degrees.

In one embodiment, the grating disc is arranged at one end of the lens barrel along the extension direction of the rotating shaft.

In one embodiment, the light source is capable of emitting a plurality of light beams, and the detector is capable of receiving the plurality of light beams emitted by the light source; when the grating disc rotates along with the lens barrel synchronously, the grating disc allows or blocks a plurality of light rays emitted by the light source to reach the detector.

A lens assembly comprises a mounting plate, a lens and the lens corner measuring structure in any scheme; the camera lens set up in camera lens corner measurement structure, camera lens corner measurement structure set up in the mounting panel.

In one embodiment, the lens assembly further includes a driving structure, the driving structure is in transmission connection with the lens or the lens barrel, and the driving structure is used for driving the lens to rotate.

In one embodiment, the lens assembly further includes a controller, and the driving structure and the angle calculating module are electrically connected to the controller respectively.

In one embodiment, the lens rotation angle measuring structure is detachably disposed on the mounting plate.

A vehicle event data recorder using the lens assembly of any of the above embodiments.

According to the lens corner measuring structure and the lens assembly, the grating disc can synchronously rotate with the lens barrel and the lens, the light source, the detector and the angle calculating module are matched to obtain the rotation angle of the lens by obtaining the rotation angle of the grating disc, so that the automatic obtaining of the rotation angle of the lens is realized, and the light source, the grating disc, the detector and the angle calculating module for non-contact measuring the lens corner have higher measuring precision and measuring stability. The lens barrel is used as a connecting structure to realize synchronous rotation between the grating disc and the lens, and the lens is only arranged in the lens barrel in the using process, so that the lens used as a precision part is effectively protected.

Drawings

Fig. 1 is a schematic view of a first view angle structure of a lens barrel and a grating disc according to an embodiment of the present invention;

fig. 2 is a schematic view of a second view angle structure of the lens barrel and the grating disc according to an embodiment of the present invention;

fig. 3 is a schematic view of a third view angle structure of the lens barrel and the grating disc according to an embodiment of the present invention;

fig. 4 is an exploded schematic view of a lens module according to an embodiment of the present invention;

fig. 5 is a schematic view of a first view structure of a lens assembly according to an embodiment of the present invention;

fig. 6 is a schematic view of a second view structure of a lens assembly according to an embodiment of the present invention;

fig. 7 is a schematic view of a third view structure of a lens assembly according to an embodiment of the present invention.

Wherein: 1. a lens assembly; 10. a lens corner measuring structure; 100. a lens barrel; 110. a housing; 111. an accommodating portion; 112. a projection; 113. flanging; 120. a light-transmitting hole; 130. a connecting shaft; 200. a grating disk; 210. a light-transmitting slit; 300. a light source; 400. a detector; 500. a lens base; 600. a set screw; 700. a shaft pressing plate; 20. a lens; 30. and (7) mounting the plate.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

In the process of shooting a target scene by using a lens, it is often necessary to keep the shooting angle and the shooting range of the lens fixed or change in a set manner for a period of time. It is difficult to manually adjust or maintain the lens at a specific photographing angle or range, and therefore it is necessary to design a lens that automatically adjusts or maintains the lens at a specific photographing angle or range. Meanwhile, in the process of automatically adjusting the lens or keeping the shooting angle and the shooting range, accurately acquiring the real-time displacement of the lens in the adjusting process is one of the key steps. The utility model provides a camera lens corner measurement structure, the turned angle (absolute angle and/or relative angle) that can real-time, high accuracy measurement camera lens provides timely, accurate feedback for the angle and the field of vision adjustment of camera lens. The utility model discloses use above-mentioned camera lens corner measurement structure to explain for the example in vehicle event data recorder, nevertheless should understand, the utility model provides a camera lens corner measurement structure can use at any in-process that needs acquire the camera lens corner, for example camera lens and various surveillance camera head etc. on the unmanned aerial vehicle.

As shown in fig. 1, 4 and 5, an embodiment of the present invention provides a lens rotation angle measuring structure 10, which includes a lens barrel 100, a grating disk 200, a light source 300, a detector 400 and an angle calculating module. The lens barrel 100 can be fixedly connected to the lens 20 along the rotation direction of the lens 20, and when the lens 20 rotates, the lens barrel 100 can be driven to rotate synchronously, and similarly, when the lens barrel 100 rotates, the lens 20 can also be driven to rotate synchronously, so as to obtain the rotation angle of the lens barrel 100, that is, the rotation angle of the lens 20. The grating disk 200 is provided to the lens barrel 100, and the grating disk 200 rotates in synchronization with the lens barrel 100. The light source 300 and the detector 400 are oppositely disposed on two sides of the grating disk 200, and when the grating disk 200 rotates synchronously with the lens barrel 100, the grating disk 200 allows or blocks light emitted from the light source 300 to reach the detector 400, that is, the detector 400 receives light emitted from the light source 300 and transmitted through the grating disk 200. The angle calculation module is electrically connected to the detector 400, and the angle calculation module can calculate and output the rotation angle of the lens 20 according to the optical signal received by the detector 400.

When the driving structure or the driving force outside the lens rotation angle measuring structure 10 drives the lens 20 to rotate, the grating disk 200 can rotate synchronously with the lens 20 and the lens barrel 100, the light source 300, the detector 400 and the angle calculating module cooperate to obtain the rotation angle of the grating disk 200 and further obtain the rotation angle of the lens 20, so that the automatic obtaining of the rotation angle of the lens 20 is realized, and the light source 300, the grating disk 200, the detector 400 and the angle calculating module for non-contact measurement of the rotation angle of the lens 20 have higher measurement accuracy and measurement stability. The lens barrel 100 is used as a connecting structure to realize synchronous rotation between the grating disc 200 and the lens 20, and only the lens 20 is installed in the lens barrel 100 in the using process, so that the lens 20 as a precision part is effectively protected.

It is understood that, in the above embodiment, the rotation angle of the lens 20 measured by the grating disk 200, the light source 300, the detector 400 and the angle calculation module may be a relative angle of a single rotation of the lens 20, or an absolute angle of the lens 20 with respect to the initial position, and may also reflect the rotation direction (clockwise or counterclockwise) of the lens 20. As an implementation manner, the light source 300 can emit a plurality of light beams, and correspondingly, the detector 400 can also receive the plurality of light beams emitted by the light source 300, when the grating disk 200 rotates along with the lens barrel 100 and the lens 20, the grating disk 200 allows or blocks the plurality of light beams emitted by the light source 300 to reach the detector 400, and then the detector 400 and the angle calculation module accurately determine the current rotation angle and rotation direction of the lens 20 according to parameters of the received light beams. When the lens rotation angle measuring structure 10 is applied to an automobile data recorder, the angle calculating module can be electrically connected to a controller of the automobile data recorder, so that the rotational displacement (the rotational angle and the rotational direction) of the lens 20 is fed back to the automobile data recorder in real time, and the controller of the automobile data recorder can conveniently perform further adjustment on the lens 20.

The following embodiments are necessary to describe the lens barrel 100, the lens 20 and the connection relationship between the two.

As shown in fig. 1-4, an embodiment of the present invention provides a lens barrel 100, the lens barrel 100 includes a housing 110, the housing 110 forms a hollow accommodating cavity, and the accommodating cavity is used for accommodating a lens 20. The housing 110 has a light hole 120, and the light hole 120 allows light to enter the lens 20. The lens barrel 100 can accommodate the whole lens 20 inside the lens barrel 100 through a hollow accommodating cavity formed by the housing 110, thereby effectively protecting the lens 20. While the light-transmitting hole 120 of the housing 110 allows the lens 20 accommodated in the lens barrel 100 to still be able to photograph. Further, the housing 110 forms a receiving cavity whose shape at least partially matches the outer shape of the lens 20. As an achievable way, the housing 110 includes an accommodating portion 111 and a protruding portion 112, the accommodating portion 111 and the protruding portion 112 are communicated, the accommodating portion 111 and the protruding portion 112 enclose to form an accommodating cavity, and the shape of the protruding portion 112 is adapted to the lens 20. The accommodating part 111 can be detachably and fixedly connected with the lens 20, one end of the protruding part 112 is connected with the accommodating part 111, the other end of the protruding part 112, which is far away from the accommodating part 111, is provided with a light hole 120, and the protruding part 112 can accommodate one end of the lens 20, which is sensitive to light. The general lens 20 is generally cylindrical, and the protrusion 112 in this embodiment can accommodate at least one end of the lens 20 exposed to light, or the protrusion 112 can accommodate a main body portion of the lens 20, and the protrusion 112 adapted to the shape of the lens 20 can effectively protect the entire lens 20.

In an embodiment of the present invention, the protruding portion 112 of the casing 110 is cylindrical, so as to accommodate the lens 20 with a cylindrical shape. As shown in fig. 1-4, and the end of the protruding portion 112, at which the light-transmitting hole 120 is formed, has a flange 113 folded inward, and after the lens 20 extends into the protruding portion 112, the flange 113 can abut against the edge of the end of the lens 20, at which the light-sensitive end is exposed, so as to limit the limit position of the lens 20 extending into the protruding portion 112, on the one hand, and on the other hand, the flange 113 abuts against the end of the lens 20, at which the light-sensitive end is exposed, so as to ensure that the positions of the lens 20 and the lens barrel 100 are relatively fixed, so that the. Meanwhile, the photosensitive end of the lens 20 is approximately flush with the light hole 120, so that the shielding of the convex part 112 on the photosensitive end of the lens 20 is avoided, and the maximum shooting range of the lens 20 is further ensured. In other embodiments of the present invention, the lens 20 may have a triangular prism shape, a rectangular parallelepiped shape, or other shapes, and correspondingly, the protrusion 112 of the housing 110 may have a corresponding shape.

The synchronous displacement between the lens 20 and the lens barrel 100 is a prerequisite to ensure that the lens rotation angle measuring structure 10 accurately measures the rotation angle of the lens 20. Alternatively, the lens 20 is mounted to the lens barrel 100 by a snap-fit manner, or the lens 20 is mounted to the lens barrel 100 by another type of connector (e.g., a threaded connection). As shown in fig. 4-7, in an embodiment of the present invention, the lens rotation angle measuring structure 10 further includes a lens holder 500, one end of the lens 20, which is far away from the light sensor, is fixedly disposed on the lens holder 500, the lens holder 500 is disposed in the accommodating portion 111, and the lens holder 500 is detachably and fixedly connected to the accommodating portion 111. In other embodiments of the present invention, the lens holder 500 can also be a part of the lens 20, and is disposed on the lens 20 at an end away from the photosensitive end. The lens 20 is mounted on the lens barrel 100 through the special lens holder 500, the lens holder 500 further enhances the protection of the lens 20 as an intermediate connecting member, and meanwhile, the lens holder 500 can allow repeated disassembly and assembly, and simultaneously, the mounting precision and the synchronous motion stability between the lens 20 and the lens barrel 100 are ensured. In the present embodiment, the lens holder 500 to which the lens 20 is attached may be fixed to the accommodating portion 111 of the lens barrel 100 using the fixing screw 600, or the lens holder 500 may be fixed to the accommodating portion 111 of the lens barrel 100 using a snap, a strap, an interference fit, or the like.

As shown in fig. 4 to 7, during the actual installation of the lens 20 and the lens rotation angle measuring structure 10, a mounting base (e.g., the mounting plate 30 or the mounting bracket, etc.) is required as a support, and the lens 20 and the lens barrel 100 are rotatably disposed on the mounting base. And it is understood that the installation base can be a part of the lens rotation angle measuring structure 10, or a part of the application scenario (such as a car recorder) of the lens rotation angle measuring structure 10. Meanwhile, the lens 20 may be directly rotatably mounted on the mounting base, and the lens 20 rotates to drive the lens barrel 100 and the grating disc 200 to synchronously rotate; or the lens barrel 100 may be directly rotatably mounted on the mounting base, and the lens barrel 100 rotates to drive the lens 20 and the grating disk 200 to rotate synchronously.

As shown in fig. 3-5, in an embodiment of the present invention, the lens barrel 100 can be directly rotatably mounted on a mounting base. Specifically, the lens barrel 100 further includes two connecting shafts 130, the two connecting shafts 130 are disposed at a rotation center of the lens barrel 100, and the two connecting shafts 130 are respectively disposed at two ends of the housing 110 along an extending direction of the rotation shaft. The lens rotation angle measuring structure 10 further includes a shaft pressing plate 700, the shaft pressing plate 700 presses against the two connecting shafts 130, and the shaft pressing plate 700 allows the two connecting shafts 130 to rotate. The lens barrel 100 is rotatably mounted on the mounting base to drive the lens 20 to rotate, so that the lens 20 is rotatably mounted on the mounting base, the cost of the lens barrel 100 is lower than that of the lens 20, the structure of the lens barrel 100 is simple relative to that of the lens 20, and the lens barrel 100 and the mounting base have stronger rotational stability. Further, the connecting shaft 130 on the lens barrel 100 is in a circular cake shape and is connected with the housing 110 through a reinforcing rib, the part of the shaft pressing plate 700, which abuts against the connecting shaft 130, is a groove with a shape matched with that of the connecting shaft 130, the shaft pressing plate 700 limits the connecting shaft 130 to rotate only relative to the installation foundation without displacement in other directions or angles, and stable rotation of the lens 20, the lens barrel 100 and the grating disc 200 is effectively guaranteed.

In the above embodiments, the grating disk 200 and the lens barrel 100 are fixedly connected by a connector, or the grating disk 200 and the lens barrel 100 are integrally formed. Both of these ways can satisfy the synchronous rotation between the grating disk 200 and the lens barrel 100. As shown in fig. 3, in an embodiment of the present invention, the grating disk 200 and the lens barrel 100 are integrally formed, so that the installation error between the grating disk 200 and the lens barrel 100 is avoided or the relative position deviation is generated in the process of repeatedly rotating, and then the precise synchronous rotation among the grating disk 200, the lens barrel 100 and the lens 20 three is effectively ensured, and the precise detection of the corner of the lens 20 is finally realized.

When the grating disk 200 rotates in synchronization with the lens 20 and the lens barrel 100, the rotation angle of the grating disk 200 is the rotation angle of the lens 20. As shown in fig. 1-2 and 5, in an embodiment of the present invention, a plurality of light slits 210 are formed on the grating disc 200, the light slits 210 are distributed on the grating disc 200 along concentric circular arcs at intervals, a central angle of a circular arc corresponding to the light slits 210 is less than or equal to 180 °, and when the lens is applied to a car data recorder, a rotation angle of the general lens 20 is less than or equal to 180 °. In other embodiments, the central angle of the circular arc corresponding to the plurality of light-transmitting slits 210 may be greater than 180 °. It is understood that the central angle of the arc corresponding to the plurality of light-transmitting slits 210 should cover the range of the rotation angle of the lens 20. Correspondingly, the grating disk 200 is in a partial round cake shape, and the central angle of the grating disk 200 is less than or equal to 180 °. Further, the grating disk 200 is disposed at one end of the lens barrel 100 along the extending direction of the rotation axis, so as to provide more installation space for installing the light source 300 and the detector 400.

As shown in fig. 4 to 7, the present invention further provides a lens assembly 1, which includes a mounting plate 30, a lens 20 and the lens rotation angle measuring structure 10 described in any of the above embodiments. The lens 20 is disposed on the lens rotation angle measuring structure 10, and the lens rotation angle measuring structure 10 is disposed on the mounting plate 30. As a practical way, the axial pressing plate 700 in the lens rotation angle measuring structure 10 is detachably mounted on the mounting plate 30, so that the lens rotation angle measuring structure 10 is integrally and detachably mounted on the mounting plate 30. In the lens assembly 1, the grating disc 200 can rotate synchronously with the lens barrel 100 and the lens 20, the light source 300, the detector 400 and the angle calculation module cooperate to obtain the rotation angle of the lens 20 by obtaining the rotation angle of the grating disc 200, so that the rotation angle of the lens 20 can be automatically obtained, and the light source 300, the grating disc 200, the detector 400 and the angle calculation module for non-contact measurement of the rotation angle of the lens 20 have higher measurement accuracy and measurement stability. The lens barrel 100 is used as a connecting structure to realize synchronous rotation between the grating disc 200 and the lens 20, and only the lens 20 is installed in the lens barrel 100 in the using process, so that the lens 20 as a precision part is effectively protected.

Further, the lens assembly 1 further includes a driving structure, the driving structure is in transmission connection with the lens 20 or the lens barrel 100, and the driving structure is used for driving the lens 20 to rotate. The driving structure enables automatic adjustment of the photographing angle of the lens 20. As an implementation manner, the driving structure includes a motor, which is in transmission connection with the lens barrel 100, and the motor can drive the lens barrel 100 to rotate, so that the motor drives the lens 20 to rotate by a corresponding angle. Meanwhile, the detector 400 and the angle calculation module can feed back the rotation angle of the lens 20 in real time, and when the lens 20 rotates by a set angle, the motor stops driving. It is understood that the lens assembly 1 further includes a controller, and the driving structure and the angle calculating module are respectively electrically connected to the controller. The controller can send an instruction to drive the lens 20 to rotate through the motor, meanwhile, the controller can receive an angle signal output by the angle calculation module, and when the lens 20 rotates by a corresponding angle, the controller outputs an instruction to enable the motor to stop driving the lens 20 to rotate. The driving structure in this embodiment may also be a power source that outputs linear motion and a motion mechanism that converts the linear motion into rotation of the lens barrel 100. Likewise, the controller of the lens assembly 1 may also be a controller of its application scenario (such as a tachograph). Correspondingly, the utility model also provides a vehicle event data recorder uses arbitrary one in the above-mentioned embodiment the camera lens subassembly 1, can realize shooting angle and the automatic adjustment of shooting scope.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (15)

1. A lens rotation angle measuring structure, comprising:

the lens barrel can be fixedly connected with the lens along the rotation direction of the lens;

the grating disc is arranged on the lens barrel and synchronously rotates with the lens barrel;

the light source and the detector are oppositely arranged on two sides of the grating disc, and when the grating disc rotates synchronously with the lens cone, the detector receives light rays emitted by the light source and penetrating through the grating disc;

and the angle calculation module is electrically connected with the detector and can calculate and output the rotation angle of the lens according to the optical signal received by the detector.

2. The lens rotation angle measuring structure according to claim 1, wherein the grating disk is fixedly connected to the lens barrel by a connecting member, or the grating disk and the lens barrel are integrally formed.

3. The lens rotation angle measuring structure according to claim 1, wherein the lens barrel includes a housing that forms a hollow accommodating chamber for accommodating a lens; the shell is provided with a light hole, and the light hole allows light rays to enter the lens.

4. The lens rotation angle measuring structure according to claim 3, wherein the housing includes an accommodating portion and a protruding portion, the accommodating portion is communicated with the protruding portion, the accommodating portion and the protruding portion enclose the accommodating chamber, and the protruding portion is shaped to fit with the lens; the accommodating part can be fixedly connected with the lens in a detachable mode, one end of the protruding part is connected with the accommodating part, the other end, far away from the accommodating part, of the protruding part is provided with the light hole, and the protruding part can accommodate one end of the lens, which is sensitive to light.

5. The lens rotation angle measuring structure according to claim 4, further comprising a lens holder, wherein an end of the lens away from the light sensor is fixedly disposed on the lens holder, the lens holder is disposed in the accommodating portion, and the lens holder is detachably and fixedly connected to the accommodating portion.

6. The lens rotation angle measuring structure according to claim 3, wherein the lens barrel further includes two connecting shafts, the two connecting shafts are disposed at a rotation center of the lens barrel, and the two connecting shafts are respectively disposed at two ends of the housing in an extending direction of the rotation shaft; the lens corner measuring structure further comprises a shaft pressing plate, the shaft pressing plate abuts against the two connecting shafts, and the shaft pressing plate allows the two connecting shafts to rotate.

7. The lens rotation angle measuring structure according to claim 1, wherein the grating disk is provided with a plurality of light-transmitting slits, the light-transmitting slits are distributed at intervals along concentric arcs on the grating disk, and a central angle of an arc corresponding to each of the light-transmitting slits is equal to or less than 180 °.

8. The lens rotation angle measuring structure according to claim 7, wherein the grating disk is in a partial circular pie shape, and a central angle of the grating disk is 180 ° or less.

9. The lens rotation angle measuring structure according to claim 1, wherein the grating disk is provided at one end of the lens barrel in the extending direction of the rotation shaft.

10. The lens rotation angle measuring structure according to claim 1, wherein the light source is capable of emitting a plurality of light beams, and the detector is capable of receiving the plurality of light beams emitted from the light source; when the grating disc rotates along with the lens barrel synchronously, the grating disc allows or blocks a plurality of light rays emitted by the light source to reach the detector.

11. A lens assembly comprising a mounting plate, a lens, and the lens rotation angle measuring structure of any one of claims 1-10; the camera lens set up in camera lens corner measurement structure, camera lens corner measurement structure set up in the mounting panel.

12. The lens assembly of claim 11, further comprising a driving mechanism, wherein the driving mechanism is in transmission connection with the lens or the lens barrel, and the driving mechanism is configured to drive the lens to rotate.

13. The lens assembly of claim 12, further comprising a controller, wherein the drive structure and the angle calculation module are each electrically connected to the controller.

14. The lens assembly of claim 11, wherein the lens rotation angle measurement structure is removably disposed on the mounting plate.

15. A tachograph employing the lens assembly of any one of claims 11 to 14.

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