A symmetrical low-friction-resistance swing arm control device based on double motors

Abstract

The application belongs to the technical field of tunable laser, and relates to a symmetrical low-friction resistance swing arm control device based on double motors. The device is completely symmetrical left and right, and comprises a swing arm structure, a swing arm fixing shaft, fixing shaft gaskets, flange ball bearings, a right swing angle motor, a left swing angle motor, a fixed base structure, a left grating ruler, a right grating ruler and a grating ruler decoder. The central position of the swing arm structure is installed on the central boss of the fixed base structure through a swing arm fixing shaft, two fixing shaft gaskets and two flange ball bearings. The left swing arm of the swing arm structure is fixedly connected with the left swing angle motor and the left grating ruler, and the right swing arm of the swing arm structure is fixedly connected with the right swing angle motor and the right grating ruler. The grating ruler decoder is installed on the fixed base structure, and the working distance between the grating decoder and the corresponding right grating ruler is a fixed value.

Description

Technical Field

[0001] This invention belongs to the field of tunable laser technology and relates to a symmetrical low-friction resistance swing arm control device based on dual motors. Background Technology

[0002] In the fields of optical sensing and optical device testing, external cavity continuously tunable lasers (ECLs) are widely used as core equipment. Their laser output offers advantages such as wavelength tunability, stable power, and narrow linewidth, gradually becoming an ideal light source for more applications. Common technical solutions for ECLs require a mechanical rotating structure to drive a blazed grating or reflecting prism to achieve wavelength tuning. Currently, domestic ECLs using the Littman technology primarily employ piezoelectric ceramic actuators to drive the reflecting prism's rotation. Applying voltage causes a slight deformation in the actuator, adjusting the prism's rotational position and deflecting the resonant optical path, thus tuning the laser wavelength. While piezoelectric ceramic actuators offer high resolution and precise displacement driving for accurate laser output wavelength tuning, their tuning rate is relatively low. Currently, lasers using piezoelectric ceramic actuators generally have a tuning rate not exceeding 200 nm / s, which cannot meet the high tuning rate requirements of tunable laser applications. With the continuous development of special applications of optical sensing, higher requirements have been placed on the tuning range, tuning rate and tuning accuracy of tunable lasers, making the development of wavelength tuning devices for tunable lasers of great significance. Summary of the Invention

[0003] The technical problem solved by this invention is to address the shortcomings of existing external cavity tunable laser wavelength output tuning schemes, which have low tuning rates. This invention proposes a symmetrical low-friction resistance swing arm control scheme based on dual motors.

[0004] The technical solution of this invention:

[0005] A symmetrical low-friction resistance swing arm control device based on dual motors, the device being completely symmetrical from left to right, comprising: a swing arm structure 1, a swing arm fixed shaft 2, a fixed shaft gasket 3, a flange ball bearing 4, a right swing angle motor 5, a left swing angle motor 6, a fixed base structure 7, a left grating ruler 9, a right grating ruler 10, and a grating ruler decoder 11.

[0006] The center position of the swing arm structure 1 is mounted on the central boss of the fixed base structure 7 via a swing arm fixing shaft 2, two fixing shaft gaskets 3 and two flange ball bearings 4; the left swing arm of the swing arm structure 1 is fixedly connected to the left swing angle motor 6 and the left grating ruler 9, and the right swing arm of the swing arm structure 1 is fixedly connected to the right swing angle motor 5 and the right grating ruler 10. The grating ruler decoder 11 is mounted on the fixed base structure 7, and the working distance between the grating decoder 11 and the corresponding right grating ruler 10 is a fixed value.

[0007] Furthermore, the device also includes: a swing arm motor rotor connection structure 8;

[0008] The left and right swing arms of the swing arm structure 1 are fixedly connected to the rotor of the left swing angle motor 6 and the rotor of the right swing angle motor 5 through the swing arm motor rotor connection structure 8, respectively. The swing angle motor rotor directly drives the swing arm structure 1 to rotate.

[0009] Furthermore, the right-side swing angle motor 5 and the left-side swing angle motor 6 are mounted on the fixed base structure 7. The swing arm motor rotor connection structure 8 is fixed to the motor rotor through four clamps 8a and connected to the fixed holes of the swing arm structure 1 through four cylindrical bosses 8b. The swing arm structure 1 is rotated by the movement of the two swing angle motor rotors.

[0010] Furthermore, the left and right swing arms of the swing arm structure 1 are completely identical. The left swing arm is provided with a groove that is fixedly connected to the left swing angle motor 6 and the left grating ruler 9; the right swing arm is provided with a groove that is fixedly connected to the right swing angle motor 5 and the right grating ruler 10 respectively.

[0011] Furthermore, the swing arm fixed shaft 2, two fixed shaft gaskets 3, and two flange ball bearings 4 form a low frictional resistance rotating shaft structure. The swing arm fixed shaft 2 passes through the upper fixed shaft gasket 3, the forward flange ball bearing, the reverse flange ball bearing, and the lower fixed shaft gasket 3 from top to bottom.

[0012] Furthermore, the swing arm fixing shaft 2 has three structures from top to bottom: nut, minor diameter, and thread. The diameter of the nut is between the outer and inner diameters of the flange ball bearing. The minor diameter of the swing arm fixing shaft 2 matches the inner diameter of the flange ball bearing. The threaded part of the swing arm fixing shaft 2 is connected to the base structure 7. The lower fixing shaft gasket separates the outer ring of the flange ball bearing from the fixed base structure 7.

[0013] The outer ring diameters of the forward flange ball bearing and the reverse flange ball bearing are consistent with the inner diameter of the center hole of the rocker arm structure 1. For a tight fit, the outer rings of the forward flange ball bearing and the reverse flange ball bearing are fixedly connected to the rocker arm structure 1 as one unit. The rocker arm structure 1 forms a low-friction resistance rotating shaft structure with the rocker arm fixed shaft 2 through the balls between the outer and inner rings of the forward flange ball bearing and the reverse flange ball bearing.

[0014] Furthermore, the left grating ruler 9 and the right grating ruler 10 are respectively installed in the symmetrical groove structures on both sides of the swing arm structure 1. The grating rulers are fixed in the grooves on both sides of the swing arm structure 1 by adhesive. The grating rulers are installed horizontally without tilting angle, and the gratings on the grating rulers are aligned through the positioning holes on the swing arm structure 1.

[0015] Furthermore, during the operation of the tunable laser, the swing arm structure 1 is fixedly connected to the reflective prism of the laser to achieve wavelength tuning output of the tunable laser.

[0016] The dual-motor symmetrical swing arm control structure proposed in this invention employs a completely symmetrical dual-sided swing arm rotation method. It utilizes two swing angle motors as the swing arm rotation drive device, combined with a low-friction resistance design for the rotating shaft, and integrates a precise position information feedback system with a grating ruler and decoder, along with a high-precision swing angle motor servo control system. This significantly improves the swing arm rotation speed and positioning accuracy, resulting in a substantial increase in the wavelength tuning speed and tuning accuracy of the tunable laser. Using this dual-motor symmetrical swing arm control structure, the tuning speed limit of current external cavity tunable laser wavelength tuning schemes can be exceeded, while simultaneously improving the absolute accuracy of the tunable laser's output wavelength. This effectively enhances the overall performance of external cavity tunable lasers, meeting the application requirements of fiber optic sensing and other fields for high-speed tuned wavelength output. Attached Figure Description

[0017] Figure 1 The present invention uses a symmetrical low-friction resistance swing arm device structure based on dual motors.

[0018] Figure 2 A schematic diagram of the cross-section of the fixed axis of the swing arm;

[0019] Figure 3 This is a schematic diagram of the oscillating motor structure;

[0020] Figure 4 This is a schematic diagram of the connection structure between the swing arm structure and the rotor of the swing angle motor. Detailed Implementation

[0021] To make the technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail and completely below with reference to the accompanying drawings of the embodiments of the present invention. The embodiments of the present invention include, but are not limited to, the following methods:

[0022] This invention provides a symmetrical low-friction resistance swing arm control device based on dual motors, mainly comprising: a swing arm structure 1, a swing arm fixed shaft 2, a fixed shaft gasket 3, a flange ball bearing 4, a right swing angle motor 5, a left swing angle motor 6, a fixed base structure 7, a swing arm motor rotor connection structure 8, a left grating ruler 9, a right grating ruler 10, and a grating ruler decoder 11.

[0023] Specifically, the left and right structures of the swing arm control device are completely symmetrical. The left and right sides of the swing arm are respectively designed with swing angle motors and grating rulers with identical structures and weights. The center position of the swing arm structure 1 is mounted on the central boss of the fixed base structure 7 through a swing arm fixing shaft 2, two fixing shaft gaskets 3 and two flange ball bearings 4. The structures and weights of the two sides of the swing arm are completely identical and symmetrically distributed, and no additional counterweight structure is required.

[0024] Specifically, the low-friction resistance swing arm control scheme consists of a swing arm fixed shaft 2, two fixed shaft washers 3, and two flange bearings 4. The fixed shaft is symmetrically distributed, from top to bottom: fixed shaft washers 3, forward flange ball bearings 4, reverse flange ball bearings 4, fixed shaft washers 3, and the swing arm fixed shaft 2 passes through it. The swing arm fixed shaft has three structures: nut, small diameter, and thread. The diameter of the nut is between the outer and inner diameters of the flange ball bearing. The small diameter of the fixed swing arm shaft matches the inner diameter of the flange ball bearing. The threaded part fixes the swing arm shaft to the fixed base structure 7. The upper and lower fixed shaft washers separate the outer ring of the flange ball bearing from the swing arm fixed base structure. The outer diameter of the flange ball bearing 4 is consistent with the inner diameter of the center hole of the swing arm structure 1. For a tight fit, the outer ring of the flange ball bearing 4 is fixedly connected to the swing arm structure. The swing arm structure 1 forms a low-friction resistance rotation structure with the swing arm fixed shaft 2 through the balls between the outer and inner rings of the flange ball bearing 4.

[0025] Specifically, the swing angle motor is a specially designed motor to match the swing arm structure. The stator of the swing angle motor can be installed on the swing arm fixed base structure 7, and the rotor structure is connected to the swing arm through the swing arm motor rotor connection structure 8. The swing angle motor rotor directly drives the swing arm structure 1 to rotate.

[0026] Specifically, the right-side swing angle motor 5 and the left-side swing angle motor 6 are mounted on the fixed base structure 7. The two swing arms on both sides of the swing arm structure 1 are connected to the rotors of the swing angle motor 56 through two swing arm motor rotor connection structures 8 respectively. The swing arm motor rotor connection structures 8 are fixed to the motor rotors through four clamps and connected to the swing arm structure 1 through four cylindrical bosses and fixed holes. The swing arm structure 1 is rotated by the movement of the two swing angle motor rotors. The movement of the two swing angle motors improves the swing arm movement speed and absolute accuracy.

[0027] Specifically, the left grating ruler 9 and the right grating ruler are respectively installed in the symmetrical groove structures on both sides of the swing arm structure 1. The grating rulers are fixed to both sides of the swing arm structure 1 by adhesive. The installation of the grating rulers must ensure the thickness of the adhesive coating and that they are installed horizontally without tilt.

[0028] Specifically, the grating ruler decoder 11 is installed on the swing arm fixed base structure. The working distance between the grating decoder and the corresponding grating ruler is a fixed value, generally about 2.5mm. It is necessary to ensure that the grating ruler and the decoder maintain normal working status throughout the entire rotation cycle and feed back the correct position signal to the swing angle motor driver.

[0029] Specifically, the low-friction resistance swing arm of the dual-motor model is driven to rotate by the rotors of the left and right swing angle motors. The grating rulers and decoders on both sides of the swing arm structure provide real-time feedback of position information, accurately positioning the swing arm's movement angle and distance.

[0030] During the wavelength tuning process of a tunable laser, the swing arm structure and the reflector are structurally fixed together. The swing arm drives the reflector to rotate, and during rotation, the left and right swing angle motors rotate simultaneously. The swing angle motors rotate as a whole in either a clockwise or counterclockwise direction. The simultaneous driving of the two motors to rotate the swing arm significantly increases the swing arm rotation rate, thereby improving the wavelength tuning rate of the tunable laser. When the tunable laser outputs a single wavelength, the reflector and swing arm structure are fixed in a certain position. The dual swing angle motors, when enabled, provide higher precision in limiting the position and angle of the swing arm, stronger resistance to external environmental interference, higher positioning accuracy of the grating ruler, and higher absolute accuracy of the tunable laser output wavelength.

[0031] See Figure 1 A dual-motor symmetrical low-friction resistance swing arm control device mainly includes: a swing arm structure 1, a swing arm fixed shaft 2, a fixed shaft gasket 3, a flange ball bearing 4, a right swing angle motor 5, a left swing angle motor 6, a swing arm fixed base structure 7, a swing arm motor rotor connection structure 8, a left grating ruler 9, a right grating ruler 10, and a grating ruler decoder 11.

[0032] Specifically, the left and right structures of the swing arm control device are completely symmetrical. The left and right sides of the swing arm are respectively designed with swing angle motors, grating rulers and grating ruler decoders with identical structures and weights. The center position of the swing arm structure 1 is mounted on the central boss of the swing arm fixed base structure 7 through a swing arm fixed shaft 2, two fixed shaft gaskets 3 and two flange ball bearings 3. The weights of the two sides of the swing arm structure 1 are completely identical and symmetrically distributed, and no additional counterweight structure is required.

[0033] See Figure 2Specifically, the low-friction resistance swing arm control scheme consists of a swing arm fixed shaft 2, two fixed shaft gaskets 3, and two flange bearings 4. The fixed shaft is symmetrically distributed, from top to bottom: fixed shaft gasket 3, forward flange ball bearing 4, reverse flange ball bearing 4, fixed shaft gasket 3, and swing arm fixed shaft 2 passes through it. The swing arm fixed shaft has three structures: nut, small diameter, and thread. The diameter of the nut is between the outer and inner ring diameters of the flange ball bearing. The small diameter of the fixed swing arm shaft matches the inner ring diameter of the flange bearing. The threaded part fixes the swing arm shaft to the swing arm fixed base structure 7. The upper and lower fixed shaft gaskets separate the outer ring of the flange ball bearing from the swing arm fixed base structure. The outer ring diameter of the flange ball bearing 4 is consistent with the inner diameter of the swing arm center structure. For a tight fit, the outer ring of the flange ball bearing is fixedly connected to the swing arm structure. The swing arm structure 1 forms a low-friction resistance rotation structure with the swing arm fixed shaft 2 through the balls between the outer and inner rings of the flange ball bearing 4.

[0034] See Figure 3 Specifically, the swing angle motor is a motor designed to match the swing arm structure. The stator of the swing angle motor can be installed on the swing arm fixed base structure 7, and the rotor structure is connected to the swing arm through a special structure. The rotor of the swing angle motor directly drives the swing arm structure 1 to rotate.

[0035] See Figure 4 Specifically, the right-side swing angle motor 5 and the left-side swing angle motor 6 are mounted on the swing arm fixed base structure 7. The two swing arms on both sides of the swing arm structure 1 are connected to the rotors of the swing angle motor 56 through two swing arm motor rotor connection structures 8 respectively. The swing arm motor rotor connection structures 8 are fixed to the motor rotors through four clamps and connected to the swing arm structure 1 through four cylindrical bosses and fixed holes. The swing arm structure 1 is rotated by the movement of the two swing angle motor rotors. The movement of the two swing angle motors improves the swing arm movement speed and absolute accuracy.

[0036] Specifically, the left grating ruler 9 and the right grating ruler are respectively installed in the symmetrical groove structures on both sides of the swing arm structure 1. The grating rulers are fixed to both sides of the swing arm structure 1 by adhesive. The installation of the grating rulers must ensure the thickness of the adhesive coating and that they are installed horizontally without tilt.

[0037] Specifically, the right-side grating ruler decoder 11 is installed on the swing arm fixed base structure. The working distance between the grating decoder and the corresponding grating ruler is a fixed value, generally about 2.5mm. It is necessary to ensure that the grating ruler and the decoder maintain normal working status throughout the entire rotation cycle and feed back the correct position signal to the swing angle motor driver.

[0038] The dual-motor symmetrical swing arm control structure proposed in this invention employs a completely symmetrical dual-sided swing arm rotation method. It utilizes two swing angle motors as the swing arm rotation drive device, combined with a low-friction resistance design for the rotating shaft, and integrates a precise position information feedback system with a grating ruler and decoder, along with a high-precision swing angle motor servo control system. This significantly improves the swing arm rotation speed and positioning accuracy, resulting in a substantial increase in the wavelength tuning speed and tuning accuracy of the tunable laser. Using this dual-motor symmetrical swing arm control structure, the tuning speed limit of current external cavity tunable laser wavelength tuning schemes can be exceeded, while simultaneously improving the absolute accuracy of the tunable laser's output wavelength. This effectively enhances the overall performance of external cavity tunable lasers, meeting the application requirements of fiber optic sensing and other fields for high-speed tuned wavelength output.

Claims

1. A symmetrical low-friction resistance swing arm control device based on dual motors, characterized in that, The device is completely symmetrical from left to right and includes: a swing arm structure (1), a swing arm fixed shaft (2), a fixed shaft gasket (3), a flange ball bearing (4), a right swing angle motor (5), a left swing angle motor (6), a fixed base structure (7), a left grating ruler (9), a right grating ruler (10), and a grating ruler decoder (11). The center position of the swing arm structure (1) is mounted on the central boss of the fixed base structure (7) via a swing arm fixing shaft (2), two fixing shaft washers (3) and two flange ball bearings (4); a left swing angle motor (6) and a left grating ruler (9) are fixedly connected to the left swing arm of the swing arm structure (1), and a right swing angle motor (5) and a right grating ruler (10) are fixedly connected to the right swing arm of the swing arm structure (1). The grating ruler decoder (11) is mounted on the fixed base structure (7), and the working distance between the grating decoder (11) and the corresponding right grating ruler (10) is a fixed value.

2. The symmetrical low-friction resistance swing arm control device based on dual motors according to claim 1, characterized in that, The device also includes: a swing arm motor rotor connection structure (8); The left and right swing arms of the swing arm structure (1) are fixedly connected to the rotor of the left swing angle motor (6) and the rotor of the right swing angle motor (5) respectively through the swing arm motor rotor connection structure (8). The swing angle motor rotor directly drives the swing arm structure (1) to rotate.

3. The symmetrical low-friction resistance swing arm control device based on dual motors according to claim 2, characterized in that, The right-side swing angle motor (5) and the left-side swing angle motor (6) are mounted on the fixed base structure (7). The swing arm motor rotor connection structure (8) is fixed to the motor rotor through four clamps (8a) and connected to the fixed hole of the swing arm structure (1) through four cylindrical bosses (8b). The swing arm structure (1) is rotated by the movement of the two swing angle motor rotors.

4. The symmetrical low-friction resistance swing arm control device based on dual motors according to claim 1, characterized in that, The left and right swing arms of the swing arm structure (1) are completely identical. The left swing arm is provided with a groove that is fixedly connected to the left swing angle motor (6) and the left grating ruler (9); the right swing arm is provided with a groove that is fixedly connected to the right swing angle motor (5) and the right grating ruler (10) respectively.

5. A symmetrical low-friction resistance swing arm control device based on dual motors according to claim 1, characterized in that, The swing arm fixed shaft (2), two fixed shaft shims (3), and two flange ball bearings (4) form a low frictional resistance rotating shaft structure. The swing arm fixed shaft (2) passes through the upper fixed shaft shim (3), the forward flange ball bearing, the reverse flange ball bearing, and the lower fixed shaft shim (3) from top to bottom.

6. The symmetrical low-friction swing arm control device based on dual motors according to claim 5, characterized in that, The swing arm fixing shaft (2) has three structures from top to bottom: nut, minor diameter, and thread. The diameter of the nut is between the outer ring diameter and the inner ring diameter of the flange ball bearing. The minor diameter of the swing arm fixing shaft (2) matches the inner ring diameter of the flange ball bearing. The threaded part of the swing arm fixing shaft (2) is connected to the base structure (7). The lower fixing shaft gasket separates the outer ring of the flange ball bearing from the fixed base structure (7). The outer ring diameters of the forward flange ball bearing and the reverse flange ball bearing are consistent with the inner diameter of the center hole of the rocker arm structure (1). For tight fit, the outer rings of the forward flange ball bearing and the reverse flange ball bearing are fixedly connected to the rocker arm structure (1). The rocker arm structure (1) forms a low frictional resistance rotating shaft structure with the fixed shaft (2) of the rocker arm through the balls between the outer and inner rings of the forward flange ball bearing and the reverse flange ball bearing.

7. A symmetrical low-friction swing arm control device based on dual motors according to claim 1, characterized in that, The left grating ruler (9) and the right grating ruler (10) are respectively installed in the symmetrical groove structure on both sides of the swing arm structure (1). The grating ruler is fixed in the groove on both sides of the swing arm structure (1) by adhesive. The grating ruler is installed horizontally without tilting angle. The grating on the grating ruler is aligned through the positioning hole on the swing arm structure (1).

8. A symmetrical low-friction resistance swing arm control device based on dual motors according to claim 1, characterized in that, During the operation of the tunable laser, the swing arm structure (1) is fixedly connected to the reflective prism of the laser to realize the wavelength tuning output of the tunable laser.

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