Focusing system for improving the stability of optical axis and beam divergence angle of focusing laser rangefinder

Abstract

The present invention discloses a focusing system for improving the stability of the optical axis and beam divergence angle of a focusing laser rangefinder. The system comprises: a drive motor that drives the axial movement of a negative lens barrel; a positive lens holder that is mounted outside the negative lens barrel; two radial adjustment mechanisms that are respectively arranged at both ends of the positive lens holder and arranged radially for adjusting the radial position of the negative lens barrel; the axial adjustment mechanism is arranged at the axial right end of the negative lens barrel, a laser emitting light source is arranged at the axial right end of the axial adjustment mechanism, and an autocollimator is arranged at the axial left end of the negative lens barrel, and the axial position of the negative lens barrel is adjusted by the axial adjustment mechanism; during the axial movement of the negative lens barrel, the laser emitting light source emits laser light, and the autocollimator reads the coordinate position of the laser emission optical axis. The present invention has a simple structure, is easy to manufacture, has flexible assembly and debugging methods, is highly operable, has high strength, and has good stability.

Description

Technical Field

[0001] The present invention belongs to the technical field of zooming of a focusing system of a laser rangefinder, and relates to a device for stabilizing the coaxiality of a laser emission optical axis with azimuth and pitch base planes during the zooming process of a focusing system of a transmission-focusing laser rangefinder, and the beam divergence angle during the switching process. The device is characterized in that when the laser emission beam divergence angle is rapidly switched during the focusing process, the device ensures the flexibility and stability of the emission optical axis and the beam divergence angle, and has high speed, adjustability, good environmental adaptability, and high reliability, thereby taking into account both the long-distance detection capability and the close-range target capture capability of the laser rangefinder. Background Art

[0002] The focusing system of a laser rangefinder requires that the laser emission optical axis drift during zooming be less than 0.01mrad and the beam divergence change be less than 0.05mm. Traditionally, the optical axis and beam divergence stability is achieved by improving the machining accuracy of related machined parts and by screening the axial play and radial runout of the zoom motor during movement, selecting a motor with small axial play and radial runout. However, as the zoom mechanism wears out and the motor's movement accuracy decreases during use, the optical axis and beam divergence stability of the rangefinder will be affected again. This method can no longer meet the optical axis and beam divergence stability requirements of the rangefinder's beam divergence zoom system. Summary of the Invention

[0003] (1) Purpose of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of existing technologies related to the drift of the laser emission optical axis and the change of the beam divergence angle during the zooming process of the focusing system of the existing transmission focus laser rangefinder, and to provide a focusing system that improves the stability of the optical axis and beam divergence angle of the focusing laser rangefinder. The focusing system has a simple device structure, meets the requirements for the stability of the optical axis and beam divergence angle of the focusing system during the zooming process, and has the characteristics of flexible assembly and debugging, strong operability, and high reliability.

[0005] (2) Technical solution

[0006] To address the above technical problems, the present invention provides a focusing system for improving the stability of the optical axis and beam divergence angle of a focusing laser rangefinder, comprising: a drive motor 1, a drive screw 2, a drive nut 3, a connecting screw 4, a first radial adjustment screw 5-1.1, a second radial adjustment screw 5-2.1, a third radial adjustment screw 5-3.1, a fourth radial adjustment screw 5-4.1, a fifth radial adjustment screw 5-5.1, a sixth radial adjustment screw 5-6.1, a seventh radial adjustment screw 5-7.1, an eighth radial adjustment screw 5-8.1, a first pressure spring 5-1.2, a second pressure spring 5-2.2, and a third pressure spring 5-3. 2. The fourth pressure spring 5-4.2, the fifth pressure spring 5-5.2, the sixth pressure spring 5-6.2, the seventh pressure spring 5-7.2, the eighth pressure spring 5-8.2, the first directional steel ball 5-1.3, the second directional steel ball 5-2.3, the third directional steel ball 5-3.3, the fourth directional steel ball 5-4.3, the fifth directional steel ball 5-5.3, the sixth directional steel ball 5-6.3, the seventh directional steel ball 5-7.3, the eighth directional steel ball 5-8.3, the axial adjustment spring 6, the axial adjustment screw 7, the adjustment negative lens barrel 8, the positive lens holder 9, the laser emitting light source 10, the E point 11, the C direction 12, and the D direction 13.

[0007] The laser rangefinder is turned on, and the focusing system is "started". The information processing circuit detects the beam divergence state of the laser rangefinder according to the received photoelectric tube signal. Then, the information processing circuit gives the number of pulses in the corresponding direction according to the beam divergence state to control the drive motor 1 to move clockwise and counterclockwise to drive the transmission screw 2. The transmission nut 3 and the transmission screw 2 move relative to each other to drive the connecting screw 4 to drive the adjustment negative lens barrel 8 to move back and forth along the axial direction C 12 and the direction D 13 to achieve zooming. In the zoom debugging work, the first radial adjustment screw 5-1.1, the second radial adjustment screw 5-2.1, the third radial adjustment screw 5-3.1, the fourth radial adjustment screw 5-4.1, the fifth radial adjustment screw 5-5.1, the sixth radial adjustment screw 5-6.1, the seventh radial adjustment screw 5-7.1, and the eighth radial adjustment screw 5-8.1 are adjusted. -8.1, adjust the force strength of the first pressure spring 5-1.2, the second pressure spring 5-2.2, the third pressure spring 5-3.2, the fourth pressure spring 5-4.2, the fifth pressure spring 5-5.2, the sixth pressure spring 5-6.2, the seventh pressure spring 5-7.2 and the eighth pressure spring 5-8.2, and change the radial movement direction of the negative lens barrel 8 through the adjustment of the first directional steel ball 5-1.3, the second directional steel ball 5-2.3, the third directional steel ball 5-3.3, the fourth directional steel ball 5-4.3, the fifth directional steel ball 5-5.3, the sixth directional steel ball 5-6.3, the seventh directional steel ball 5-7.3 and the eighth directional steel ball 5-8.3 to achieve the coaxiality of the pitch and azimuth of the laser emission optical axis and the main unit installation base, while reducing the friction with the positive lens seat 9 and improving the flexibility of the zoom system. The axial adjustment screw 7 is rotated clockwise or counterclockwise to change the tensile force of the axial adjustment spring 6 to eliminate the axial movement of the drive motor 1 and ensure the stability of the laser beam divergence angle.

[0008] (3) Beneficial effects

[0009] The focusing system provided by the above technical solution for improving the stability of the optical axis and beam divergence angle of a focusing laser rangefinder has the following beneficial effects:

[0010] (1) Simple structure and easy processing. The device for stabilizing the optical axis and beam divergence angle has a simple structure, contains fewer parts, is easy to process, and is easy to implement.

[0011] (2) The focusing system of the focusing laser rangefinder meets the coaxiality stability of the laser emission optical axis and the azimuth and pitch base planes during the zooming process, and the stability of the beam divergence angle during the switching process of large and small beam divergence, thereby avoiding the drift of the laser emission optical axis during the zooming process of the focusing system of the focusing laser rangefinder and ensuring the stability of the beam divergence angle.

[0012] (3) Flexible assembly and debugging methods, strong operability. The focusing system of the focusing laser rangefinder can be corrected and adjusted at any time according to the changes in the optical axis and beam divergence angle. It has the characteristics of flexible debugging and strong assembly method operability.

[0013] (4) High strength and good stability. The focusing system of this focusing laser rangefinder has greatly improved the stability of the emission optical axis and beam divergence angle compared to the traditional focusing system. The locking force of the radial adjustment screw can be adjusted according to the torque of the transmission motor to ensure that the friction between the negative lens barrel and the directional steel ball is minimized. The focusing system of the entire focusing laser rangefinder is flexible and not easy to shake during the zooming process. It has good stability and provides stable support for the rangefinder system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic front view of the structure of the focusing system of the focusing laser rangefinder of the present invention.

[0015] Figure 2 This is an AA cross-sectional view of the focusing system of the focusing laser rangefinder of the present invention.

[0016] Figure 3 This is a BB cross-sectional view of the focusing system of the focusing laser rangefinder of the present invention.

[0017] As shown in the figure: 1—driving motor, 2—transmission screw, 3—transmission nut, 4—connecting screw, 5-1.1—first radial adjusting screw, 5-2.1—second radial adjusting screw, 5-3.1—third radial adjusting screw, 5-4.1—fourth radial adjusting screw, 5-5.1—fifth radial adjusting screw, 5-6.1—sixth radial adjusting screw, 5-7.1—seventh radial adjusting screw, 5-8.1—eighth radial adjusting screw, 5-1.2—first pressure spring, 5-2.2—second pressure spring, 5-3.2—third pressure spring, 5-4.2—fourth pressure spring, 5-5.2—first 5. Pressure spring, 5-6.2—sixth pressure spring, 5-7.2—seventh pressure spring, 5-8.2—eighth pressure spring, 5-1.3—first directional steel ball, 5-2.3—second directional steel ball, 5-3.3—third directional steel ball, 5-4.3—fourth directional steel ball, 5-5.3—fifth directional steel ball, 5-6.3—sixth directional steel ball, 5-7.3—seventh directional steel ball, 5-8.3—eighth directional steel ball, 6—axial adjustment spring, 7—axial adjustment screw, 8—adjustment of negative lens barrel, 9—positive lens seat, 10—laser emitting light source, 11—point E, 12—direction C, 13—direction D. DETAILED DESCRIPTION

[0018] In order to make the purpose, content and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below with reference to the accompanying drawings and examples.

[0019] like Figure 1 、 Figure 2 、 Figure 3 As shown, the focusing system of this embodiment for improving the stability of the optical axis and beam divergence angle of a focusing laser rangefinder includes a driving motor 1, a driving transmission mechanism, a radial adjustment mechanism, an adjusting negative lens barrel 8, a positive lens holder 9, an axial adjustment mechanism, a laser emitting light source 10, and an autocollimator; the driving motor 1 is connected to one end of the driving transmission mechanism, and the other end of the driving transmission mechanism is connected to the side wall of the adjusting negative lens barrel 8, and the adjusting negative lens barrel 8 is driven axially by the driving motor 1; the positive lens holder 9 is installed on the outside of the adjusting negative lens barrel 8; there are two groups of radial adjustment mechanisms, which are respectively arranged at both ends of the positive lens holder 9 and arranged radially, and are used to adjust the radial position of the adjusting negative lens barrel 8; the axial adjustment mechanism is arranged at the axial right end of the adjusting negative lens barrel 8, the laser emitting light source 10 is arranged at the axial right end of the axial adjustment mechanism, and the autocollimator is arranged at the axial left end of the adjusting negative lens barrel 8, and the axial position of the adjusting negative lens barrel 8 is adjusted by the axial adjustment mechanism; during the axial movement of the adjusting negative lens barrel 8, the laser emitting light source 10 emits laser, and the autocollimator reads the coordinate position of the laser emitting optical axis.

[0020] The drive transmission mechanism includes a transmission screw 2, a transmission nut 3, and a connecting screw 4. The transmission screw 2 is arranged at the output end of the drive motor 1 and is connected to the transmission nut 3. One end of the connecting screw 4 is connected to the transmission nut 3, and the other end passes through the positive lens holder 9 and is connected to the side wall of the adjustable negative lens barrel 8. The drive motor 1 drives the transmission screw 2 to move clockwise or counterclockwise, and the transmission screw 2 drives the adjustable negative lens barrel 8 to move axially through the transmission nut 3 and the connecting screw 4.

[0021] The transmission screw 2 is threadedly connected to the transmission nut 3. When the transmission screw 2 rotates, the transmission nut 3 is driven to move linearly. The transmission nut 3 is fixedly connected to the connecting screw 4, and the transmission nut 3 drives the connecting screw 4 to move synchronously.

[0022] An adjustment component mounting hole is provided on the positive lens holder 9. Each set of radial adjustment mechanisms includes four sets of adjustment components evenly spaced along the radial direction. Each set of adjustment components includes a radial adjustment screw, a pressure spring, and a directional steel ball installed in the adjustment component mounting hole. The directional steel ball contacts the outer wall of the adjustment negative lens barrel 8. The radial adjustment screw is threadedly installed at the opening of the adjustment component mounting hole. The pressure spring is located between the directional steel ball and the radial adjustment screw. During the zooming process, the radial adjustment mechanism is adjusted to change the emission position of the laser optical axis to ensure the stability of the emission optical axis. In order to adjust the change in the axial position of the negative lens barrel 8, the two radially opposite sets of adjustment components are adjusted synchronously during the radial adjustment.

[0023] The axial adjustment mechanism includes an axial adjustment spring 6 and an axial adjustment screw 7. One end of the axial adjustment spring 6 contacts the end surface of the adjustment negative lens barrel 8, and the other end is pressed by the axial adjustment screw 7.

[0024] A dial indicator is installed on one side of the connecting screw 4, and the dial indicator head contacts the side surface of the connecting screw 4, which is used to measure the movement value of the connecting screw 4 during the movement process.

[0025] Facing the left end face of the adjusting negative lens barrel 8, it is preferred that the four adjustment components of each radial adjustment mechanism are respectively arranged in the upper direction, lower direction, left direction and right direction of the same circumferential circle of the adjusting negative lens barrel 8, that is, the lower direction is defined as vertically downward, and the other three directions are spaced 90° apart in sequence.

[0026] Reference Figure 2 and Figure 3 As shown, the adjustment components of the two groups of radial adjustment mechanisms include: a first radial adjustment screw 5-1.1, a second radial adjustment screw 5-2.1, a third radial adjustment screw 5-3.1, a fourth radial adjustment screw 5-4.1, a fifth radial adjustment screw 5-5.1, a sixth radial adjustment screw 5-6.1, a seventh radial adjustment screw 5-7.1, an eighth radial adjustment screw 5-8.1, a first pressure spring 5-1.2, a second pressure spring 5-2.2, a third pressure spring 5-3.2, a fourth pressure spring 5-4.2, a fifth pressure spring 5-5.2, a sixth pressure spring 5-6.2, a seventh pressure spring 5-7.2, an eighth pressure spring 5-8.2, a first directional steel ball 5-1.3, a second directional steel ball 5-2.3, a third directional steel ball 5-3.3, a fourth directional steel ball 5-4.3, a fifth directional steel ball 5-5.3, a sixth directional steel ball 5-6.3, a seventh directional steel ball 5-7.3, and an eighth directional steel ball 5-8.3.

[0027] Based on the structure of the above-mentioned focusing system, the focusing method of this embodiment for improving the stability of the optical axis and beam divergence angle of a focusing laser rangefinder includes the following steps:

[0028] S1: Start the laser emitting light source 10 and the driving motor 1 at the same time, driving the transmission screw 2 to make two movements, one is clockwise movement, driving the adjustment negative lens barrel 8 to move 2mm in the positive lens direction C direction 12 through the transmission nut 3 and the connecting screw 4, and the other is counterclockwise movement, driving the adjustment negative lens barrel 8 to move 2mm in the laser emitting direction D direction 13 through the transmission nut 3 and the connecting screw 4; read the laser emitting optical axis coordinate position after the two movements respectively through the autocollimator.

[0029] In this step, both movements are based on adjusting the initial state of the negative lens barrel 8 to start movement and measurement.

[0030] S2: By adjusting the radial runout of the negative lens barrel 8 brought about by the movement of the negative lens barrel 8 along the C direction 12 and the D direction 13, find the center value of the radial runout of the negative lens barrel 8, and determine the deviation direction of the optical axis of the negative lens barrel 8 according to the obtained center value. For example: facing the end face of the negative lens barrel 8, when the negative lens barrel 8 is adjusted to move along the C direction 12, the radial runout is 2mm upward, and when it moves along the D direction 13, the radial runout is 1mm downward. At this time, the center value of the radial runout is 1.5mm, and the deviation direction of the optical axis is upward. By analogy, there will be different situations where the deviation direction of the optical axis is downward, left, right, etc.

[0031] S3: According to the deviation direction of the optical axis of the negative lens barrel 8, adjust the adjustment component of the radial adjustment mechanism until the laser emission optical axis and the installation base surface are coaxial, and the coaxiality is <0.01mrad.

[0032] The specific adjustments are divided into the following four situations:

[0033] ① If the optical axis deviates to the left, tighten the second radial adjusting screw 5-2.1 and the sixth radial adjusting screw 5-6.1 clockwise, and tighten the fourth radial adjusting screw 5-4.1 and the eighth radial adjusting screw 5-8.1 counterclockwise; ② If the optical axis deviates to the right, tighten the second radial adjusting screw 5-2.1 and the sixth radial adjusting screw 5-6.1 counterclockwise, and tighten the fourth radial adjusting screw 5-4.1 and the eighth radial adjusting screw 5-8.1 clockwise; ③ If the optical axis deviates to the upper part, tighten the first radial adjusting screw 5-1.1 and the seventh radial adjusting screw 5-7.1 clockwise, and tighten the third radial adjusting screw 5-3.1 and the fifth radial adjusting screw 5-5.1 counterclockwise; ④ If the optical axis deviates to the lower part, tighten the first radial adjusting screw 5-1.1 and the seventh radial adjusting screw 5-7.1 counterclockwise, and tighten the third radial adjusting screw 5-3.1 and the fifth radial adjusting screw 5-5.1 clockwise.

[0034] S4: Repeat steps S1-S3 multiple times to adjust the friction between the radial adjustment mechanism and the adjustment negative lens barrel 8 so that the mutual friction coefficient reaches the minimum value, making the zoom system flexible and stable during the zooming process.

[0035] S5: Start the laser emitting light source 10 and the driving motor 1 at the same time, drive the adjusting negative lens barrel 8 to make a reciprocating motion along the axial direction C 12 and the D direction 13, and measure the dial indicator value when it reaches the position of the dial indicator head at point E 11. Measure back and forth three times. If the difference between the three measured values ​​is greater than 0.01mm, rotate the axial adjusting screw 7 counterclockwise to shorten the length of the axial adjusting spring 6, increase the tensile force of the axial adjusting spring 6, and eliminate the axial play clearance of the driving motor 1. Finally, the three measured values ​​of the dial indicator at point E 11 are less than 0.01mm. When moving in the C direction 12, the beam divergence angle is 1mrad±0.05mrad, and when moving in the D direction 13, the beam divergence angle is 0.7mrad±0.05mrad.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A focusing method for improving the stability of the optical axis and beam divergence angle of a focusing laser rangefinder, characterized in that: The focusing method adopts a focusing system for improving the stability of the optical axis and beam divergence angle of a focusing laser rangefinder to perform focusing. The focusing system is characterized in that it comprises: a driving motor (1), a driving transmission mechanism, a radial adjustment mechanism, an adjustment negative lens barrel (8), a positive lens holder (9), an axial adjustment mechanism, a laser emitting light source (10), and an autocollimator; the driving motor (1) is connected to one end of the driving transmission mechanism, and the other end of the driving transmission mechanism is connected to the side wall of the adjustment negative lens barrel (8), and the driving motor (1) drives the adjustment negative lens barrel (8) to move axially; the positive lens holder (9) is installed on the adjustment negative lens barrel (8) ) outside; there are two groups of radial adjustment mechanisms, which are respectively arranged at both ends of the positive lens holder (9) and arranged in the radial direction, and are used to adjust the radial position of the negative lens barrel (8); the axial adjustment mechanism is arranged at the axial right end of the negative lens barrel (8), the laser emitting light source (10) is arranged at the axial right end of the axial adjustment mechanism, and the autocollimator is arranged at the axial left end of the negative lens barrel (8), and the axial position of the negative lens barrel (8) is adjusted by the axial adjustment mechanism; during the axial movement of the negative lens barrel (8), the laser emitting light source (10) emits laser light, and the autocollimator reads the coordinate position of the laser emitting optical axis; The drive transmission mechanism comprises a transmission screw (2), a transmission nut (3), and a connecting screw (4); the transmission screw (2) is arranged at the output end of the drive motor (1); the transmission screw (2) is connected to the transmission nut (3); one end of the connecting screw (4) is connected to the transmission nut (3), and the other end passes through the positive lens holder (9) and is connected to the side wall of the adjustment negative lens barrel (8); The transmission screw (2) is threadedly connected to the transmission nut (3), and the transmission screw (2) rotates to drive the transmission nut (3) to move linearly; The transmission nut (3) is fixedly connected to the connecting screw (4), and the transmission nut (3) drives the connecting screw (4) to move synchronously; The positive lens seat (9) is provided with an adjustment component mounting hole, each set of radial adjustment mechanisms comprises four sets of adjustment components evenly spaced along the radial direction, and one set of adjustment components is mounted in one adjustment component mounting hole; Each set of adjustment components comprises a radial adjustment screw, a pressure spring, and a directional steel ball installed in the adjustment component mounting hole, the directional steel ball contacts the outer side wall of the adjustment negative lens barrel (8), the radial adjustment screw is threadedly connected and installed at the opening of the adjustment component mounting hole, and the pressure spring is located between the directional steel ball and the radial adjustment screw; The axial adjustment mechanism comprises an axial adjustment spring (6) and an axial adjustment screw (7); one end of the axial adjustment spring (6) contacts the end surface of the adjustment negative lens barrel (8), and the other end is pressed by the axial adjustment screw (7); A dial indicator is installed on one side of the connecting screw (4), and the dial indicator head contacts the side of the connecting screw (4) to measure the movement value of the connecting screw (4) during the movement process; Facing the left end surface of the adjustment negative lens barrel (8), the four adjustment components of each radial adjustment mechanism are respectively arranged in the upper direction, the lower direction, the left direction and the right direction of the same circumferential circle of the adjustment negative lens barrel (8), the lower direction is defined as vertically downward, and the other three directions are sequentially spaced 90 degrees apart; The focusing method comprises the following steps: S1: Simultaneously start the laser emission light source (10) and the drive motor (1), driving the transmission screw (2) to move twice, one is a clockwise movement, driving the adjustment negative lens barrel (8) to move 2 mm in the positive lens direction C direction (12) through the transmission nut (3) and the connecting screw (4), and the other is a counterclockwise movement, driving the adjustment negative lens barrel (8) to move 2 mm in the laser emission direction D direction (13) through the transmission nut (3) and the connecting screw (4); respectively read the laser emission optical axis coordinate position after the two movements through the autocollimator; both movements are based on the initial state of the adjustment negative lens barrel (8); S2: by adjusting the radial runout of the negative lens barrel (8) caused by the movement of the negative lens barrel (8) along the C direction (12) and the D direction (13), finding the center value of the radial runout of the negative lens barrel (8), and judging the deviation direction of the optical axis of the negative lens barrel (8) according to the obtained center value; S3: According to the deviation direction of the optical axis of the negative lens barrel (8), the adjustment component of the radial adjustment mechanism is adjusted until the laser emission optical axis and the installation base surface are coaxial, and the coaxiality is less than 0.01 mrad; S4: Repeat steps S1-S3 multiple times to adjust the friction between the radial adjustment mechanism and the adjustment negative lens barrel (8) so that the friction coefficient between them reaches a minimum value; S5: Simultaneously start the laser emitting light source (10) and the driving motor (1), drive the adjusting negative lens barrel (8) to make a reciprocating motion in the axial direction in the C direction (12) and the D direction (13), and measure the dial indicator value when the dial indicator head reaches the position of point E (11). The reciprocating measurement is performed three times. If the difference between the three measured values ​​is greater than 0.01 mm, the axial adjustment screw (7) is rotated counterclockwise to shorten the length of the axial adjustment spring (6), increase the tensile force of the axial adjustment spring (6), and eliminate the axial play clearance of the driving motor (1). Finally, the three measured values ​​of the dial indicator at point E (11) are less than 0.01 mm.

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