Portable focal length adjustment device

Abstract

The application discloses a portable focal length adjusting device, which comprises an adjusting gear, a plurality of meshing teeth are circumferentially arranged on the adjusting gear; an adjusting screw rod, the adjusting screw rod is fixedly connected to the adjusting gear and passes through a mounting hole arranged on the adjusting gear; two fixing bases, a through hole is arranged on each of the two fixing bases, and the two fixing bases are respectively connected to two ends of the adjusting screw rod; two limiting seats, the two limiting seats are arranged at two ends of the adjusting gear and are matched with the two fixing bases respectively; an adjusting worm, the adjusting worm is arranged below the adjusting gear and is engaged with the adjusting gear to drive the adjusting gear to rotate; and a driving motor, the driving motor is connected to one end of the adjusting screw rod to drive the adjusting screw rod to rotate; when the driving motor rotates in a first direction, the adjusting screw rod drives the two fixing bases to move close to each other when rotating; and when the driving motor rotates in a second direction, the adjusting screw rod drives the two fixing bases to move away from each other when rotating. The portable focal length adjusting device has simple structure and can be quickly adjusted through the driving motor.

Description

TECHNICAL FIELD

[0001] The present application relates to a portable focal length adjusting device. BACKGROUND

[0002] In an optical system, a lens is an optical element that is often applied to converge, collimate or diverge light propagating in the light path. If the lens is installed in a wrong position, the imaging quality of the entire optical system will be directly affected. Therefore, the installation and positioning of the lens are very important.

[0003] However, in actual use, the actual value of the focal length of the lens will be different from the designed value. At the same time, the components used to fix the optical elements such as the lens have installation errors, so the focal length of the lens needs to be adjusted for a long time during the actual assembly process. SUMMARY

[0004] The present application provides a portable focal length adjusting device to solve the above-mentioned technical problems, which specifically adopts the following technical scheme:

[0005] A portable focal length adjusting device comprises:

[0006] An adjusting gear is provided with meshing teeth in the circumferential direction;

[0007] An adjusting screw passes through a mounting hole provided on the adjusting gear and is fixedly connected to the adjusting gear. The adjusting screw is hollow, and the surfaces of the two ends of the adjusting screw are formed with external threads;

[0008] Two fixed bases are used to mount a first optical element and a second optical element to be adjusted, respectively. The fixed bases are provided with through holes, and the inner walls of the through holes are formed with internal threads matched with the external threads of the ends of the adjusting screw. The two fixed bases are connected to the two ends of the adjusting screw, respectively. The first optical element is a lens;

[0009] Two limiting seats are provided at the two ends of the adjusting gear and are matched with the two fixed bases to guide and limit the fixed bases;

[0010] An adjusting worm is perpendicular to the adjusting screw and is provided below the adjusting gear to mesh with the adjusting gear to drive the adjusting gear to rotate;

[0011] A driving motor is connected to one end of the adjusting screw to drive the adjusting screw to rotate;

[0012] A base is connected to the two limiting seats and the driving motor;

[0013] A shell is mounted to the base to form an accommodation space. The positions opposite to the two fixed bases on the two sides of the shell are respectively provided with through windows;

[0014] When the driving motor rotates in the first direction, the adjusting screw drives the two fixed bases to move towards each other when rotating, and when the driving motor rotates in the second direction, the adjusting screw drives the two fixed bases to move away from each other when rotating.

[0015] Further, the portable focal length adjusting device further comprises:

[0016] Two worm supporting seats are arranged at two ends of the adjusting worm to rotate and support the adjusting worm, the worm supporting seat is connected to the base, and a bearing for rotating and supporting the adjusting worm is arranged in the worm supporting seat;

[0017] A motor fixing seat is arranged on the base, and the driving motor is fixed to the motor fixing seat.

[0018] Further, the portable focal length adjusting device further comprises:

[0019] Two screw supporting seats are fixedly connected to the upper surface of the shell, the two screw supporting seats are located on the two sides of the adjusting gear and cooperate with the adjusting screw to rotate and support the adjusting screw, and one end of the screw supporting seat away from the upper surface of the shell is formed with an elastic socket, and the adjusting screw is clamped in the elastic socket.

[0020] Further, an installation window is formed above the shell;

[0021] The shell comprises a transparent installation plate matched with the installation window;

[0022] The two screw supporting seats are fixedly connected to the installation plate;

[0023] One of the fixed base and the limiting seat matched therewith is provided with a limiting groove, and the other is provided with a limiting convex rib matched with the limiting groove;

[0024] The limiting groove and the limiting convex rib extend in a direction parallel to the rotation axis of the adjusting screw.

[0025] Further, one of the fixed base and the limiting seat matched therewith is provided with a T-shaped guide groove, and the other is provided with a T-shaped guide rib matched with the T-shaped guide groove;

[0026] The T-shaped guide groove and the T-shaped guide rib extend in a direction parallel to the rotation axis of the adjusting screw.

[0027] Further, the portable focal length adjusting device further comprises:

[0028] A camera is used to collect an imaging image of the portable focal length adjusting device;

[0029] An image analysis unit is used to analyze the imaging image to determine the current focusing state;

[0030] A controller is configured to control the driving motor based on the analysis result of the image analysis unit.

[0031] Further, the portable focal length adjusting device further comprises:

[0032] A distance sensor is arranged on one of the two fixed bases to detect the distance between the two fixed bases, and the middle part of the adjusting gear is made of transparent material to allow the detection laser of the distance sensor to pass through;

[0033] A controller is configured to control the driving motor based on the distance between the two fixed bases detected by the distance sensor.

[0034] Further, the first optical element is mounted to the end of the through hole of the fixed base away from the adjusting gear;

[0035] The second optical element is one of a lens and a fiber connector, and is mounted to the end of the through hole of the other fixed base away from the adjusting gear.

[0036] Further, the middle part of the adjusting screw is formed with a mounting portion matched with the mounting hole of the adjusting gear and a mounting flange, the first fixing hole is formed on the mounting flange, and the second fixing hole matched with the second fixing hole is formed on the adjusting gear.

[0037] Further, the portable focal length adjusting device further comprises:

[0038] A coupling is connected to one end of the adjusting screw and the motor shaft of the driving motor.

[0039] The portable focal length adjusting device has the advantages of simple structure and fast adjustment through the driving motor.

[0040] The portable focal length adjusting device has the advantages of adjusting the position of the lens through the structure of the worm gear, and after the position is adjusted, the self-locking function of the worm gear is utilized to fix the lens without additional steps.

[0041] The portable focal length adjusting device has the advantages of self-adaptive driving mode through image analysis, and the lens adjustment can be quickly and accurately completed without manual intervention. BRIEF DESCRIPTION OF DRAWINGS

[0042] Fig. 1 is a schematic diagram of a confocal imaging calibration device of the present application;

[0043] Fig. 2 is an exploded view of a confocal imaging calibration device of the present application;

[0044] Fig. 3is an internal schematic diagram of a confocal imaging calibration device of the present application;

[0045] The portable focal length adjusting device 100, the adjusting gear 11, the mounting hole 111, the second fixing hole 112, the adjusting screw 12, the mounting part 121, the mounting flange 122, the first fixing hole 123, the fixing base 13, the first optical element 131, the second optical element 132, the through hole 133, the limiting seat 14, the adjusting worm 15, the driving motor 16, the base 17, the shell 18, the through window 181, the mounting window 182, the mounting plate 183, the worm support seat 19, the bearing 191, the motor fixing seat 20, the screw support seat 21, the elastic clamp 211, the shaft coupling 22. DETAILED DESCRIPTION

[0046] The present application will be specifically introduced below in combination with the drawings and specific embodiments.

[0047] As Figs. 1-3 The portable focal length adjusting device 100 of the present application comprises an adjusting gear 11, an adjusting screw 12, two fixing bases 13, two limiting seats 14, an adjusting worm 15, a driving motor 16, a base 17 and a shell 18. The adjusting gear 11 is circumferentially provided with meshing teeth. The adjusting screw 12 passes through the mounting hole 111 provided on the adjusting gear 11 and is fixedly connected to the adjusting gear 11. The adjusting screw 12 is hollow, and the surfaces of the two ends of the adjusting screw 12 are formed with external threads. The two fixing bases 13 are respectively used for mounting the first optical element 131 and the second optical element 132 to be adjusted, and the first optical element 131 is a lens. The fixing base 13 is provided with a through hole 133, the inner wall of the through hole 133 is formed with internal threads matched with the external threads of the end of the adjusting screw 12, and the two fixing bases 13 are respectively connected to the two ends of the adjusting screw 12. The two limiting seats 14 are provided at the two ends of the adjusting gear 11 and respectively cooperate with the two fixing bases 13 to guide and limit the fixing bases 13, and the fixing bases 13 can only slide on the upper surfaces of the limiting seats 14 and cannot rotate. The adjusting worm 15 is perpendicular to the adjusting screw 12 and is provided below the adjusting gear 11 to mesh with the adjusting gear 11 to drive the adjusting gear 11 to rotate. The driving motor 16 is connected to one end of the adjusting screw 12 to drive the adjusting screw 12 to rotate. The two limiting seats 14 and the driving motor 16 are connected to the base 17. The shell 18 is mounted to the base 17 to form a containing space. The two sides of the shell 18 are respectively provided with through windows 181 opposite to the two fixing bases 13. The external threads and the internal threads are arranged such that when the driving motor 16 rotates in a first direction, the adjusting screw 12 drives the two fixing bases 13 to move closer to each other when rotating, and when the driving motor 16 rotates in a second direction, the adjusting screw 12 drives the two fixing bases 13 to move away from each other when rotating.

[0048] As a preferred embodiment, the portable focal length adjusting device 100 further comprises two worm supporting seats 19 and a motor fixing seat 20.

[0049] The two worm supporting seats 19 are respectively arranged at the two ends of the adjusting worm 15 to rotatably support the adjusting worm 15. The worm supporting seats 19 are connected to the base 17, and the worm supporting seats 19 are further provided with bearings 191 for rotatably supporting the adjusting worm 15. The motor fixing seat 20 is arranged on the base 17, and the driving motor 16 is fixed to the motor fixing seat 20. Preferably, the portable focal length adjusting device 100 further comprises a coupling 22. One end of the coupling 22 is connected to the adjusting screw 12, and the other end of the coupling 22 is connected to the motor shaft of the driving motor 16.

[0050] As a preferred embodiment, the portable focal length adjusting device 100 further comprises two screw supporting seats 21.

[0051] Specifically, the two screw supporting seats 21 are fixedly connected to the upper surface of the housing 18. The two screw supporting seats 21 are respectively arranged at the two sides of the adjusting gear 11 and cooperated with the adjusting screw 12 to rotatably support the adjusting screw 12. The end of the screw supporting seat 21 away from the upper surface of the housing 18 is formed with an elastic socket 211, and the adjusting screw 12 is clamped in the elastic socket 211.

[0052] It can be understood that the base 17 is provided with the adjusting worm 15 and the two limiting seats 14 in the axial direction of the adjusting screw 12. If the two screw supporting seats 21 are also arranged on the base 17, the installation space of the base 17 is relatively cramped. At the same time, if so arranged, the base 17 will be provided with the adjusting worm 15, the two limiting seats 14 and the two screw supporting seats 21 in the axial direction of the adjusting screw 12. This will greatly increase the size of the portable focal length adjusting device 100 in the axial direction of the adjusting screw 12. Therefore, in the present application, the two screw supporting seats 21 are arranged on the housing 18 above the base 17. During the installation of the housing 18 to the base 17, the elastic socket 211 is deformed and finally clamped to the adjusting screw 12.

[0053] As a preferred embodiment, the housing 18 is formed with an installation window 182 above. The housing 18 comprises a transparent installation plate 183 matched with the installation window 182. The two screw supporting seats 21 are fixedly connected to the installation plate 183.

[0054] It can be understood that the housing 18 is separately provided with a transparent mounting plate 183, and the two screw rod support seats 21 are fixedly connected to the mounting plate 183. On the one hand, the installation and fixation of the screw rod support seat 21 are facilitated; on the other hand, through the transparent mounting plate 183, the matching relationship between the screw rod support seat 21 and the adjusting screw rod 12 can be observed, and the screw rod support seat 21 is facilitated to be clamped to the adjusting screw rod 12.

[0055] Preferably, one of the fixed base 13 and the limiting seat 14 matched therewith is provided with a limiting groove (not shown), and the other is provided with a limiting convex rib (not shown) matched with the limiting groove. The limiting groove and the limiting convex rib extend in a direction parallel to the rotation axis of the adjusting screw rod 12. In this way, the matching of the limiting groove and the limiting convex rib is used to limit the movement of the fixed base 13.

[0056] As another alternative embodiment, one of the fixed base 13 and the limiting seat 14 matched therewith is provided with a T-shaped guide groove, and the other is provided with a T-shaped guide rib matched with the T-shaped guide groove. The T-shaped guide groove and the T-shaped guide rib extend in a direction parallel to the rotation axis of the adjusting screw rod 12. In this way, the fixed base 13 can not only limit the rotation of the limiting seat 14, but also limit the disengagement of the limiting seat 14 from the upper surface of the fixed base 13. In this way, the adjusting screw rod 12 will be supported by two fixed bases 13, and the screw rod support seat 21 can be cancelled.

[0057] As a preferred embodiment, the portable focal length adjusting device 100 further comprises a camera, an image analysis unit and a controller.

[0058] The camera is used to collect an imaging image of the portable focal length adjusting device 100. The image analysis unit is used to analyze the imaging image to determine the current focusing state. The controller is used to control the driving motor 16 according to the analysis result of the image analysis unit.

[0059] It can be understood that whether the adjustment of the focal length lens is reasonable can be judged through the imaging result of the lens. Specifically, an imaging area is arranged on the side of the portable focal length adjusting device 100, and the light passing through the lens will be imaged in the imaging area. The theoretical imaging result is a horizontal and uniform straight line, and if the adjusted focal length is too small or too large, the imaged straight line will be inclined or uneven in thickness. Therefore, first, the imaging image is collected by the camera, and the imaging image is analyzed by the image analysis unit to determine the current focusing state. The controller controls the driving motor 16 according to the analysis result of the image analysis unit. The whole process does not need human intervention, and the focal length adjustment work can be quickly and accurately completed.

[0060] As another alternative adjustment mode, the portable focal length adjusting device 100 can further comprise a distance sensor and a sensor.

[0061] A distance sensor is mounted on one of the two fixed bases 13 to detect the distance between them. The center portion of the adjustment gear 11 is made of a transparent material to allow the distance sensor's detection laser to pass through. A controller controls the drive motor 16 based on the distance between the two fixed bases 13 detected by the distance sensor.

[0062] As a preferred embodiment, the first optical element 131 is mounted to the end of the through hole 133 of the fixed base 13, away from the adjustment gear 11. The second optical element 132, which is either a lens or a fiber optic connector, is mounted to the end of the through hole 133 of the other fixed base 13, away from the adjustment gear 11. In this application, the second optical element 132 is a fiber optic connector for connecting to an external optical fiber, and is fixed to the end of the through hole 133 of the other fixed base 13, away from the adjustment gear 11, by a component such as a retaining ring.

[0063] As a preferred embodiment, the middle part of the adjusting screw 12 is formed on a mounting portion 121 and a mounting flange 122 that cooperate with the mounting hole 111 of the adjusting gear 11, a first fixing hole 123 is formed on the mounting flange 122, and a second fixing hole 112 that cooperates with the second fixing hole 112 is formed on the adjusting gear 11.

[0064] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the scope of protection of the present invention.

Claims

1. A portable focal length adjustment device, characterized by, The portable focal length adjusting device comprises: an adjusting gear, which is provided with meshing teeth in a circumferential direction; an adjusting screw, which passes through a mounting hole provided on the adjusting gear and is fixedly connected to the adjusting gear, the adjusting screw is hollow, and the surfaces of the two ends of the adjusting screw are formed with external threads; two fixed bases, which are respectively used for mounting a first optical element and a second optical element to be adjusted, the fixed bases are provided with through holes, the inner walls of the through holes are formed with internal threads matched with the external threads of the ends of the adjusting screw, the two fixed bases are respectively connected to the two ends of the adjusting screw, and the first optical element is a lens; two limiting seats, which are provided at the two ends of the adjusting gear and are matched with the two fixed bases respectively to guide and limit the fixed bases; an adjusting worm, which is perpendicular to the adjusting screw and is provided below the adjusting gear to mesh with the adjusting gear to drive the adjusting gear to rotate; a driving motor, which is connected to one end of the adjusting screw to drive the adjusting screw to rotate; a base, to which the two limiting seats and the driving motor are connected; a shell, which is mounted to the base to form a containing space, the two sides of the shell are respectively provided with through windows at positions opposite to the two fixed bases; when the driving motor rotates in a first direction, the adjusting screw drives the two fixed bases to move close to each other when rotating, and when the driving motor rotates in a second direction, the adjusting screw drives the two fixed bases to move away from each other when rotating; The portable focal length adjusting device further comprises: a distance sensor, which is provided on one of the two fixed bases to detect the distance between the two fixed bases, and the middle part of the adjusting gear is made of a transparent material to allow the detection laser of the distance sensor to pass through; a controller, which controls the driving motor according to the distance between the two fixed bases detected by the distance sensor; The portable focal length adjusting device further comprises: two worm supporting seats, which are respectively provided at the two ends of the adjusting worm to rotatably support the adjusting worm, the worm supporting seats are connected to the base, and the worm supporting seats are further provided with bearings for rotatably supporting the adjusting worm; a motor fixing seat, which is provided on the base, and the driving motor is fixed to the motor fixing seat.

2. The portable focal length adjusting device according to claim 1, wherein The portable focal length adjusting device further comprises: two screw supporting seats, which are fixedly connected to the upper surface of the shell, the two screw supporting seats are respectively located on the two sides of the adjusting gear and are matched with the adjusting screw to rotatably support the adjusting screw, and the ends of the screw supporting seats away from the upper surface of the shell are formed with elastic clamps, and the adjusting screw is clamped in the elastic clamps.

3. The portable focal length adjusting device according to claim 2, wherein an installation window is formed above the shell; the shell comprises a transparent installation plate matched with the installation window; the two screw supporting seats are fixedly connected to the installation plate. One of the fixed base and the limiting seat matched with the fixed base is provided with a limiting groove, and the other is provided with a limiting convex rib matched with the limiting groove; The limiting groove and the limiting convex rib extend in a direction parallel to the rotation axis of the adjusting screw. 4.The portable focal length adjusting device according to claim 1, characterized in that, One of the fixed base and the limiting seat matched with the fixed base is provided with a T-shaped guide groove, and the other is provided with a T-shaped guide rib matched with the T-shaped guide groove; The T-shaped guide groove and the T-shaped guide rib extend in a direction parallel to the rotation axis of the adjusting screw. 5.The portable focal length adjusting device according to claim 1, characterized in that, The first optical element is mounted to one end of the through hole of the fixed base away from the adjusting gear; The second optical element is one of a lens and a fiber connector, and is mounted to one end of the through hole of the other fixed base away from the adjusting gear. 6.The portable focal length adjusting device according to claim 1, characterized in that, The middle part of the adjusting screw is formed with a mounting part matched with the mounting hole of the adjusting gear and a mounting flange, the mounting flange is formed with a first fixing hole, and the adjusting gear is formed with a second fixing hole matched with the first fixing hole. 7.The portable focal length adjusting device according to claim 1, characterized in that, The portable focal length adjusting device further comprises: A coupling, one end of which is connected to the adjusting screw and the other end of which is connected to the motor shaft of the driving motor.

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