CN107678119B - Device for switching tristable multi-view-field zoom lens of optical system - Google Patents
Device for switching tristable multi-view-field zoom lens of optical system Download PDFInfo
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- CN107678119B CN107678119B CN201710790978.6A CN201710790978A CN107678119B CN 107678119 B CN107678119 B CN 107678119B CN 201710790978 A CN201710790978 A CN 201710790978A CN 107678119 B CN107678119 B CN 107678119B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/02—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective
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Abstract
The invention relates to a device for switching a tristable multi-view-field zoom lens of an optical system, which comprises three mutually independent rotary switching lens groups; a set of rotary driving motors is used as a power source, power output is carried out through a driving shaft, and the position of the lens group is rotated; the power can be freely switched among three different lens groups through a tristable electromagnetic switching device; and locking the working position of the lens group through a permanent magnet limiting device. The multi-view-field zoom mechanism can realize independent switching of the three lens groups by one set of driving motor through the three-stable-state electromagnetic switching device, has compact structure and light weight, realizes free switching of view fields with large zoom ratio and multiple gears through the combination of working lenses of different lens groups, and greatly improves the adaptability and the observation effect of an optical system.
Description
Technical Field
The invention belongs to the technical field of optical instruments, and relates to a device for switching a tristable multi-view-field zoom lens of an optical system, which is used for realizing free switching among a plurality of optical view fields with different magnifications and can provide zoom of 8-grade view fields at most.
Background
In military and civil detection and imaging optical systems such as a high-resolution visible light detection device and an infrared camera, wide, medium, small and ultra-small fields of view may be required at the same time, and real-time switching is performed according to different observation targets, which is generally realized by a field-of-view zooming mechanism. Commonly used field magnification varying techniques mainly include: the linear type continuous zooming mode and the switching type zooming mode.
The linear continuous zooming is realized by moving the zooming lens group in the light path to change the focal length of the optical system, and the zooming lens group has a certain movement range, so that the structure occupies a larger space, and simultaneously has the defects of more and complicated components, longer time required for zooming, and the like.
The switching type view field zooming is to cut a zooming lens group into an original optical system to form a new optical view field, has the characteristics of short switching time, simplicity in assembly and adjustment, compact size in the direction of an optical axis, large space size between lens components, high transmittance and the like, is limited by the limitation of the number of zoom lenses, has fewer variable view fields, and generally only has two wide and narrow view fields.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides a device for switching a tristable multi-view-field zoom lens of an optical system, which mainly aims at the optical system with the view field switching requirement, such as a visible light detection device, an infrared search tracking system and the like, and can realize the switching among 8 different view fields with the maximum width, the middle size, the small size, the ultra-small size and the like.
Technical scheme
A device for switching an optical system tristable multi-view field zoom lens is characterized in that: the three-stable-state electromagnetic switching device comprises a base 1, a lens group support 2, a first driving shaft support 3, a second driving shaft support 4, a driving motor 5, a driving shaft 6, a three-stable-state electromagnetic switching device 7, a first lens group 8, a second lens group 9, a third lens group 10 and two permanent magnet limiting devices 11; the lens group support 2 is fixed on a bottom plate of the base 1, the first driving shaft support 3 and the second driving shaft support 4 are respectively fixed on two sides of the lens group support 2, the driving shaft 6 is fixed between the two driving shaft supports, and the tristable electromagnetic switching device 7 is sleeved on the driving shaft 6; a motor 501 of the driving motor 5 is connected with the driving shaft 6 through a gear 502; the first lens group 8, the second lens group 9 and the third lens group 10 are sleeved on the tristable electromagnetic switching device 7 through square keys, and the three lens groups are fixed at different positions and angles according to combination requirements; the corresponding parts of the bottom plate and the upper bracket of the base 1 are respectively provided with a permanent magnet limiting device.
The lens group bracket 2 comprises a bracket 201, a first fixed shaft 202, a second fixed shaft 203 and a pressing ring 204; the first fixing shaft 202 and the second fixing shaft 203 respectively pass through shaft holes on the bracket 201 and are axially fastened by a pressing ring 204.
The driving shaft 6 comprises a first half shaft 601, a fixed iron core 602, a second half shaft 603, a gear 604 and a square key 605; the fixed core 602 is threaded at both ends to connect the first half shaft 601 and the second half shaft 603 together by a threaded fit, the gear 604 is fixed to the first half shaft 601 to be engaged with the gear 502, and the square key 605 is located in the square groove of the second half shaft 603.
The three-stable state electromagnetic switching device 7 of the driving shaft 6 comprises a stable state maintaining spring 701, an electromagnetic actuating device 702 and a ratchet shaft 703; the electromagnetic actuator 702 and the ratchet shaft 703 are concentrically and fixedly connected, and both ends of the electromagnetic actuator are respectively abutted against the two steady-state maintaining springs 701.
The electromagnetic actuating device 702 comprises a shell 7021, a first centering coil 7022, a second centering coil 7023, a left moving coil 7024, a right moving coil 7025, a permanent magnet 7026 and a magnetic conductive block 7027; all the coils, the permanent magnets 7025 and the magnetic conductive blocks 7027 are concentrically fixed inside the housing 7021.
The first lens group 8 comprises a bracket 801, a first objective lens 802, a second objective lens 803, a transmission block 804, a tail counterweight 805 and a limiting iron core 806; the first objective lens 802 and the second objective lens 803 are respectively fixed in two lens holes of the bracket 801, the tail counterweight 805 is located at one end of the bracket 801 opposite to the two lens holes, the limiting iron core 806 is located at the side edges of the two lens holes of the bracket 801, and the transmission block 804 is located in the shaft hole of the bracket 801.
The second lens group 9 comprises a bracket 901, a third objective lens 902, a transmission block 903, a tail counterweight 904 and a limiting iron core 905; the third objective 902 is fixed in the lens hole of the bracket 901, the tail counterweight 904 is located at one end of the bracket 901 opposite to the lens hole, the limiting iron core 905 is located at the side of the lens hole of the bracket 901, and the transmission block 903 is located in the shaft hole of the bracket 901.
The third lens group 10 comprises a bracket 101, a first ocular 102, a second ocular 103, a transmission block 104, a tail counterweight 105 and a limiting iron core 106; the first eyepiece 102 and the second eyepiece 103 are respectively fixed in two lens holes of the bracket 101, the tail counterweight 105 is positioned at one end of the bracket 101 opposite to the two lens holes, the limiting iron core 106 is positioned at the side edges of the two lens holes of the bracket 101, and the transmission block 104 is positioned in the shaft hole of the bracket 101.
The permanent magnet limiting device 11 is used for fixing the permanent magnet 112 at a position needing limiting in the shell 111.
The permanent magnet 112 is fixed by gluing.
Independent switching of different lens groups can be realized through the driving motor 5, the driving shaft 6 and the tristable electromagnetic switching device 7; the lens group is locked by a permanent magnet limiting device 11 at the working position; by combining different lenses of the three lens groups, at most 8-gear field zooming can be realized.
Advantageous effects
The invention provides a device for switching a tristable multi-view-field zoom lens of an optical system, which comprises three mutually independent rotary switching lens groups; a set of rotary driving motors is used as a power source, power output is carried out through a driving shaft, and the position of the lens group is rotated; the power can be freely switched among three different lens groups through a tristable electromagnetic switching device; and locking the working position of the lens group through a permanent magnet limiting device. The multi-view-field zoom mechanism can realize independent switching of the three lens groups by one set of driving motor through the three-stable-state electromagnetic switching device, has compact structure and light weight, realizes free switching of view fields with large zoom ratio and multiple gears through the combination of working lenses of different lens groups, and greatly improves the adaptability and the observation effect of an optical system.
Drawings
FIG. 1 is a structural composition diagram of a tristable multi-field zoom mechanism of the present invention;
FIG. 2 is an exploded composition diagram of the tristable multi-field magnification change mechanism of the present invention;
FIG. 3 is a cross-sectional component view of the tristable multi-field magnification varying mechanism of the present invention;
FIG. 4 is a view showing the composition of the first lens group;
FIG. 5 is a view showing the composition of the second lens group;
FIG. 6 is a view showing the composition of the third lens group;
FIG. 7 is a component view of the electromagnetic actuating device;
FIG. 8 is a component view of a permanent magnet spacing device;
in the figure, 1-base, 2-lens group bracket, 3-first driving shaft bracket, 4-second driving shaft bracket, 5-driving motor, 6-driving shaft, 7-three steady state electromagnetic switching device, 8-first lens group, 9-second lens group, 10-third lens group, 11-permanent magnetic limiting device, 201-bracket, 202-first fixed shaft, 203-second fixed shaft, 204-pressing ring, 501-motor, 502-gear, 601-first half shaft, 602-fixed iron core, 603-second half shaft, 604-gear, 605-square key, 701-steady state maintaining spring, 702-electromagnetic actuating device, 703-ratchet shaft, 7021-shell, 7022-first centering coil, 7023-second centering coil, 7024-left shift coil, 7025-right shift coil, 7026-permanent magnet, 7027-magnetic conduction block, 801-bracket, 802-first objective lens, 803-second objective lens, 804-transmission block, 805-tail balance weight, 806-limit iron core, 901-bracket, 902-third objective lens, 903-transmission block, 904-tail balance weight, 905-limit iron core, 101-bracket, 102-first ocular lens, 103-second ocular lens, 104-transmission block, 105-tail balance weight, 106-limit iron core, 111-shell and 112-permanent magnet.
Detailed Description
The invention will now be further described with reference to the following examples and drawings:
the tristable multi-view-field zoom mechanism of the present embodiment includes a base 1, a lens group support 2, a first driving shaft support 3, a second driving shaft support 4, a driving motor 5, a driving shaft 6, a tristable electromagnetic switching device 7, a first lens group 8, a second lens group 9, a third lens group 10, and a permanent magnet limiting device 11.
The base 1 is a main supporting part of the field magnification varying mechanism, and the field magnification varying mechanism is also fixed in the whole optical system through the base 1, so that high rigidity and strength are required. The lens group support 2, the first driving shaft support 3 and the second driving shaft support 4 are fastened to the corresponding positions of the base 1 by screws.
The lens group bracket 2 is composed of a bracket 201, a first fixing shaft 202, a second fixing shaft 203 and a pressing ring 204, wherein the first fixing shaft 202 and the second fixing shaft 203 respectively penetrate through shaft holes on the bracket 201 and are axially fastened by the pressing ring 204. The first lens group 8, the second lens group 9 and the third lens group 10 can rotate around a first fixed shaft 202 and a second fixed shaft 203.
The first driving shaft support 3 is provided with a driving shaft hole and a motor shaft hole which are mainly used for fixing the left end of the driving shaft 6 and the driving motor 5, and the second driving shaft support 4 is provided with a driving shaft hole which is mainly used for fixing the right end of the driving shaft 6. During assembly, the relative positions of the first driving shaft support 3 and the second driving shaft support 4 can be adjusted, and the driving shaft 6 can be ensured to rotate smoothly.
The driving motor 5 is composed of a motor 501 and a gear 502, the motor 501 is a rotary servo control motor and is provided with an angle encoder, so that the accurate angle rotation and data output can be realized, and the motor 501 is arranged on the first driving shaft support 3 through a threaded hole. Gear 502 is fixed to the rotating shaft of motor 501 and meshes with gear 604. Since the output of the motor 501 has already been reduced by the gear box of the motor, the gears 502 and 604 have no requirement on reduction ratio, and are mainly used for changing the moving direction and realizing compact installation of the motor 501.
The drive shaft 6 is composed of a first half shaft 601, a fixed core 602, a second half shaft 603, a gear 604 and a square key 605, and both ends thereof pass through shaft holes of the first drive shaft support 3 and the second drive shaft support 4, respectively, and can rotate around the shaft holes. Two ends of a fixed iron core 602 are provided with threads, corresponding ends of a first half shaft 601 and a second half shaft 603 are provided with threaded holes, the first half shaft 601 and the second half shaft 603 are concentrically connected together to form a shaft through threaded matching, a gear 604 is fixed on the first half shaft 601 and is meshed with the gear 502 to transmit the rotation of the driving motor 5 to the driving shaft 6, one half of a square key 605 is positioned in an axial square groove of the second half shaft 603, the other half of the square key is positioned in an axial square groove of the ratchet shaft 703 to transmit the rotation of the driving shaft 6 to the ratchet shaft 703, and meanwhile, the ratchet shaft 703 can be ensured to freely slide along the axial direction of the driving shaft 6.
The three-stable state electromagnetic switching device 7 is nested outside the driving shaft 6 and consists of a stable state maintaining spring 701, an electromagnetic actuating device 702 and a ratchet shaft 703. The electromagnetic actuator 702 and the ratchet shaft 703 are concentrically and fixedly connected, two ends of the electromagnetic actuator are respectively abutted against the two steady-state maintaining springs 701, and the other ends of the two steady-state maintaining springs 701 are respectively abutted against the first driving shaft support 3 and the second driving shaft support 4. The electromagnetic actuator 702 is further composed of a housing 7021, a first centering coil 7022, a second centering coil 7023, a left moving coil 7024, a right moving coil 7025, a permanent magnet 7025, and a magnetic block 7027, all of which are concentrically fixed inside the housing 7021. The first centering coil 7022 is nested outside the right shift coil 7025, the second centering coil 7023 is nested outside the left shift coil 7024, the winding directions of the wire groups of the first centering coil 7022 and the second centering coil 7023 are the same, and the winding directions of the wire groups of the left shift coil 7024 and the right shift coil 7025 are opposite.
The first lens group 8, the second lens group 9 and the third lens group 10 are mounted on the lens group support 2 and can freely rotate around the shaft within a certain angle range. The first lens group 8 is composed of a bracket 801, a first objective lens 802, a second objective lens 803, a transmission block 804, a tail counterweight 805 and a limiting iron core 806, wherein the first objective lens 802 and the second objective lens 803 are respectively fixed in a lens hole of the bracket 801, and the tail counterweight 805 is used for balancing the weight of the first objective lens 802, the second objective lens 803 and the structure, so that the center of gravity of the lens group is located on the rotation axis. The second lens group 9 is composed of a support 901, a third objective lens 902, a transmission block 903, a tail counterweight 904 and a limiting iron core 905, wherein the third objective lens 902 is fixed in a lens hole of the support 901, and the tail counterweight 904 is used for balancing the weight of the third objective lens 902 and the structure, so that the center of gravity of the lens group is positioned on the rotation axis. The third lens group 10 is composed of a bracket 101, a first ocular 102, a second ocular 103, a transmission block 104, a tail counterweight 105 and a limiting iron core 106, wherein the first ocular 102 and the second ocular 103 are respectively fixed in a lens hole of the bracket 101, and the tail counterweight 105 is used for balancing the weight of the first ocular 102, the second ocular 103 and the structure, so that the center of gravity of the lens group is positioned on a rotation axis.
The permanent magnet limiting devices 11 are distributed on two sides of the three lens groups and are composed of a shell 111 and permanent magnets 112, threads are arranged on the shell 111, the permanent magnet limiting devices 11 are fixed on the base 1, and the permanent magnets 112 are fixed in the shell 111 through epoxy glue and the like in a bonding mode.
The included angles between the centers of the first objective lens 802 and the second objective lens 803 in the first lens group 8 and the rotation center, the included angles between the centers of the first eyepiece lens 102 and the second eyepiece lens 103 and the rotation center in the third lens group 11, and the included angles between two adjacent ratchets on the ratchet shaft 703 all need to be the same, so as to ensure the accurate meshing between the ratchets and the grooves and the accurate positioning of the lenses under different rotation angles. During initial assembly, the angles of the three lens groups are not strictly required.
The aim of the invention is achieved by the following measures: a three-stable-state multi-view-field zooming mechanism comprises a base, a lens group support, a first driving shaft support, a second driving shaft support, a driving motor, a driving shaft, a three-stable-state electromagnetic switching device, a first lens group, a second lens group, a third lens group and a permanent magnet limiting device. Wherein, the base is the main supporting part of the whole device, and the zooming mechanism is fixed in the whole optical system through the base. The lens group support, the first driving shaft support and the second driving shaft support are fastened on the base through screws. The lens group support comprises a support, a first fixing shaft, a second fixing shaft and a pressing ring, wherein the first fixing shaft and the second fixing shaft respectively penetrate through shaft holes in the support, and are axially limited and fastened by the pressing ring. The first driving shaft support is provided with a driving shaft hole and a motor shaft hole which are mainly used for fixing the left end of the driving shaft and the driving motor, and the second driving shaft support is provided with a driving shaft hole which is mainly used for fixing the right end of the driving shaft. The driving motor consists of a motor and a gear, the motor is a rotary servo control motor and is provided with an angle encoder, so that the angle output with higher precision can be realized, and the gear is fixed on a motor shaft. The driving shaft consists of a first half shaft, a fixed iron core, a second half shaft, a gear and a square key, wherein two ends of the fixed iron core are provided with threads, corresponding ends of the first half shaft and the second half shaft are provided with threaded holes, the first half shaft and the second half shaft are concentrically connected together through a thread pair, and the gear is fixed at the shaft end of the first half shaft and is meshed with a gear of a driving motor. The tri-stable electromagnetic switching device consists of a stable maintaining spring, an electromagnetic actuating device and a ratchet shaft, wherein the electromagnetic actuating device and the ratchet shaft are concentrically and fixedly connected, two ends of the electromagnetic actuating device are respectively abutted against the two stable maintaining springs, the tri-stable electromagnetic switching device is nested outside the driving shaft and can slide in a certain range along the axial direction, and a square key of the driving shaft is positioned between the second half shaft and the ratchet shaft. The first lens group, the second lens group and the third lens group are arranged on the lens group support and can freely rotate around the shaft within a certain angle range, the first lens group consists of a support, a first objective lens, a second objective lens, a transmission block, a tail counterweight and a limiting iron core, the second lens group consists of a support, a third objective lens, a transmission block, a tail counterweight and a limiting iron core, and the third lens group consists of a support, a first eyepiece, a second eyepiece lens, a transmission block, a tail counterweight and a limiting iron core. The permanent magnet limiting devices are distributed on two sides of the three lens groups and are composed of a shell and permanent magnets, threads are arranged on the shell, the permanent magnet limiting devices are fixed on the base, and the permanent magnets are fixed in the shell in a bonding mode through epoxy glue and the like.
The main principle of the invention for realizing multi-view switching is as follows: the first lens group, the second lens group and the third lens group can rotate around the lens group bracket within a certain range, and the main working positions are upper limit positions and lower limit positions. For example, when the first lens group, the second lens group and the third lens group are positioned at the lower limit position, the first objective lens and the first eyepiece are positioned in the working light path, and a certain zoom ratio can be realized. At this time, if the second lens group is rotated to the upper limit, the third objective lens will cut into the working optical path, and a new optical view field will be formed. Because the first lens group, the second lens group and the third lens group have two effective working positions, 8 different optical fields can be realized at most through arrangement and combination among different lenses.
In order to ensure independent rotation of the three mirror groups, the rotary motion of the driving motor can be transmitted to only one mirror group at the same time, which is mainly realized by a tristable electromagnetic switching device. The three-stable state electromagnetic switching device consists of a stable state maintaining spring, an electromagnetic actuating device and a ratchet shaft, wherein the electromagnetic actuating device consists of a shell, a first centering coil, a second centering coil, a left moving coil, a right moving coil, a permanent magnet and a magnetic conduction block.
At the initial moment, two identical steady state maintaining springs have certain compression amount, the fixed iron core is positioned in the middle position of the permanent magnet, and due to the fact that air gaps on two sides are equal, magnetic resultant force borne by the electromagnetic actuating device is zero, and even if the coil is powered off, the electromagnetic actuating device is stabilized in the middle steady state position under the action of the two springs. At this time, the ratchets on the ratchet shaft are engaged with the grooves on the second lens group transmission block, and the power can be transmitted to the second lens group through the driving shaft, the square key and the ratchet shaft.
The initial electromagnetic actuating device is in the middle position, the right shift coil is electrified at the moment, the magnetic field at the left side of the permanent magnet is enhanced, the electromagnetic actuating device is gradually increased by the electromagnetic force at the right side and is finally larger than the increase value of the counterforce of the spring, the electromagnetic actuating device moves rightwards at the moment, even if the power supply is cut off, the electromagnetic actuating device is subjected to a large permanent magnetic holding force by the magnetic field generated by the permanent magnet through the low reluctance impedance between the magnetic poles of the part of the loop where the fixed iron core is located, and the force of the magnetic field is larger than the reverse elasticity of the spring, so that the electromagnetic actuating device can be in the right side position under the condition that the current does not pass. At this time, the ratchets on the ratchet shaft are engaged with the grooves on the first lens group transmission block and separated from the grooves on the second lens group transmission block, and power can be transmitted to the first lens group through the driving shaft, the square keys and the ratchet shaft.
The initial electromagnetic actuating device is in the middle position, the left shift coil is electrified at the moment, the right magnetic field of the permanent magnet is enhanced, the electromagnetic actuating device is gradually increased by the leftward electromagnetic force and is finally larger than the increase value of the counterforce of the spring, the electromagnetic actuating device moves leftward at the moment, even if the power supply is cut off, the electromagnetic actuating device is subjected to a large permanent magnet holding force due to the fact that the magnetic field generated by the permanent magnet passes through low reluctance resistance between the magnetic poles of the part of the loop where the fixed iron core is located, the force of the magnetic field is larger than the reverse elasticity of the spring, and therefore the electromagnetic actuating device can be located at the left position under the condition that current does not pass through the left shift coil. At this time, the ratchets on the ratchet shaft are engaged with the grooves on the third lens group transmission block and separated from the grooves on the second lens group transmission block, and power can be transmitted to the third lens group through the driving shaft, the square keys and the ratchet shaft.
The initial electromagnetic actuating device is at the left side or the right side position, the first centering coil and the second centering coil are electrified at the time, the magnetic field of the permanent magnet is weakened, the electromagnetic force applied to the electromagnetic actuating device is gradually reduced and is finally smaller than the increase value of the counterforce of the spring, the electromagnetic actuating device moves in the middle at the time, and according to the previous analysis, even if the coils are powered off, the electromagnetic actuating device is stabilized at the middle stable position under the action of the two springs. At the moment, the ratchets on the ratchet shaft are meshed with the grooves on the second lens group transmission block and are separated from the grooves on the first lens group or the third lens group transmission block.
By electrifying the corresponding coils, the electromagnetic actuating device can be controlled to be positioned at different positions of the left, the middle and the right, and the electromagnetic actuating device can also be stably positioned at the current position after the coils are disconnected, so that three stable states are provided.
When the ratchets on the ratchet shaft are separated from the grooves on the lens group transmission block, the lens group can not be acted by the locked-rotor torque of the driving motor any longer, so that a certain measure is needed to lock the lens group at the upper and lower working positions. The two sides of each lens group are provided with a limiting iron core, and corresponding permanent magnet limiting devices are distributed, when the limiting iron cores are close to the permanent magnet limiting devices, the limiting iron cores are attracted by the permanent magnets, and therefore the lens groups are fixed at the working positions. Because the lens group is designed in a dynamic balance way and is provided with corresponding balance weights, the gravity center is positioned at the rotation center, the unbalanced moment borne by the lens group is small even under the vibration condition, and the attraction of the permanent magnet can ensure that the lens group is not loosened. The torsion moment of the driving motor is larger, so that the attraction of the permanent magnet limiting device can be overcome, and the change of the position of the lens group is realized. The height of the permanent magnet limiting device can be adjusted through threads, so that the lens group can be ensured to have higher in-place precision.
Claims (8)
1. A device for switching an optical system tristable multi-view field zoom lens is characterized in that: the three-stable-state electromagnetic switching device comprises a base (1), a mirror group support (2), a first driving shaft support (3), a second driving shaft support (4), a driving motor (5), a driving shaft (6), a three-stable-state electromagnetic switching device (7), a first mirror group (8), a second mirror group (9), a third mirror group (10) and two permanent magnet limiting devices (11); the lens group support (2) is fixed on a bottom plate of the base (1), the first driving shaft support (3) and the second driving shaft support (4) are respectively fixed on two sides of the lens group support (2), the driving shaft (6) is fixed between the two driving shaft supports, and the tristable electromagnetic switching device (7) is sleeved on the driving shaft (6); a motor (501) of the driving motor (5) is connected with the driving shaft (6) through a second gear (502); the first lens group (8), the second lens group (9) and the third lens group (10) are sleeved on the three-stable-state electromagnetic switching device (7), and the three lens groups are fixed at different positions and angles according to combination requirements; the corresponding parts of the bottom plate of the base (1) and the upper bracket are respectively provided with a permanent magnet limiting device;
the three-stable state electromagnetic switching device (7) comprises a stable state maintaining spring (701), an electromagnetic actuating device (702) and a ratchet shaft (703); the electromagnetic actuating device (702) and the ratchet shaft (703) are concentrically and fixedly connected, and two ends of the electromagnetic actuating device are respectively abutted against the two steady-state maintaining springs (701); the other ends of the two steady-state maintaining springs (701) respectively abut against the first driving shaft bracket (3) and the second driving shaft bracket (4);
the electromagnetic actuating device (702) comprises a shell (7021), a first centering coil (7022), a second centering coil (7023), a left moving coil (7024), a right moving coil (7025), a permanent magnet (7026) and a magnetic conduction block (7027);
all the coils, the permanent magnet (7025) and the magnetic conduction block (7027) are concentrically fixed inside the shell (7021);
a first centering coil (7022) is nested outside the right shift coil (7025) and a second centering coil (7023) is nested outside the left shift coil (7024).
2. The apparatus of claim 1, wherein the lens switching device comprises: the lens group bracket (2) comprises a bracket (201), a first fixed shaft (202), a second fixed shaft (203) and a pressing ring (204); the first fixing shaft (202) and the second fixing shaft (203) respectively penetrate through shaft holes in the support (201) and are axially fastened by a pressing ring (204).
3. The apparatus of claim 1, wherein the lens switching device comprises: the driving shaft (6) comprises a first half shaft (601), a fixed iron core (602), a second half shaft (603), a first gear (604) and a square key (605); the fixed iron core (602) is provided with threads at two ends, a first half shaft (601) and a second half shaft (603) are connected together through thread fit, a first gear (604) is fixed on the first half shaft (601) and meshed with a second gear (502), and a square key (605) is positioned in a square groove of the second half shaft (603).
4. The apparatus of claim 1, wherein the lens switching device comprises: the first lens group (8) comprises a bracket (801), a first objective lens (802), a second objective lens (803), a transmission block (804), a tail counterweight (805) and a limiting iron core (806); the first objective lens (802) and the second objective lens (803) are respectively fixed in two lens holes of the bracket (801), the tail counterweight (805) is positioned at one end of the bracket (801) opposite to the two lens holes, the limiting iron core (806) is positioned at the side edges of the two lens holes of the bracket (801), and the transmission block (804) is positioned in the shaft hole of the bracket (801).
5. The apparatus of claim 1, wherein the lens switching device comprises: the second lens group (9) comprises a bracket (901), a third objective lens (902), a transmission block (903), a tail counterweight (904) and a limiting iron core (905); the third objective lens (902) is fixed in a lens hole of the support (901), the tail counterweight (904) is positioned at one end of the support (901) opposite to the lens hole, the limiting iron core (905) is positioned at the side edge of the lens hole of the support (901), and the transmission block (903) is positioned in a shaft hole of the support (901).
6. The apparatus of claim 1, wherein the lens switching device comprises: the third lens group (10) comprises a bracket (101), a first ocular (102), a second ocular (103), a transmission block (104), a tail counterweight (105) and a limiting iron core (106); the first ocular (102) and the second ocular (103) are respectively fixed in two lens holes of the bracket (101), the tail counterweight (105) is positioned at one end of the bracket (101) opposite to the two lens holes, the limiting iron core (106) is positioned at the side edges of the two lens holes of the bracket (101), and the transmission block (104) is positioned in a shaft hole of the bracket (101).
7. The apparatus of claim 1, wherein the lens switching device comprises: the permanent magnet limiting device (11) is used for fixing the permanent magnet (112) at a position needing limiting in the shell (111).
8. The apparatus of claim 7, wherein the lens switching device comprises: the permanent magnet (112) is fixed by gluing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710790978.6A CN107678119B (en) | 2017-09-05 | 2017-09-05 | Device for switching tristable multi-view-field zoom lens of optical system |
Applications Claiming Priority (1)
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| CN109471255A (en) * | 2018-11-26 | 2019-03-15 | 中国工程物理研究院应用电子学研究所 | A kind of electromagnetic drive optical attenuator switching device and switching system |
| CN110501797B (en) * | 2019-09-20 | 2022-09-06 | 合肥英睿系统技术有限公司 | Infrared lens device capable of automatically detecting and identifying view field |
| CN111796390B (en) * | 2020-06-09 | 2021-05-18 | 中国科学院西安光学精密机械研究所 | Three-view-field switching mechanism for optical equipment |
| CN111796382B (en) * | 2020-07-21 | 2021-04-27 | 中国科学院长春光学精密机械与物理研究所 | Optical system switching mechanism |
| CN117111257B (en) * | 2023-10-20 | 2023-12-26 | 南通蓬盛机械有限公司 | Infrared optical system with field-of-view switching mechanism |
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