CN109491041B

CN109491041B - Multiplying power switching device for three-gear zoom lens

Info

Publication number: CN109491041B
Application number: CN201811501566.7A
Authority: CN
Inventors: 庄嘉兴; 杨继兴; 范增明; 索继元; 朱立新; 张晨钟; 吴晓靖
Original assignee: Tianjin Jinhang Institute of Technical Physics
Current assignee: Tianjin Jinhang Institute of Technical Physics
Priority date: 2018-12-10
Filing date: 2018-12-10
Publication date: 2021-05-11
Anticipated expiration: 2038-12-10
Also published as: CN109491041A

Abstract

The invention discloses a multiplying power switching device for a three-gear zoom lens, which creatively uses a motor to control two rotating assemblies to complete the switching among short-focus, middle-focus and long-focus working modes of the multiplying power switching device. The driven gear rotates in a reversing way and then needs to rotate 90 degrees to continuously drive the idler wheel to rotate; two middle-focus optical machine components of the middle-focus rotating component are designed into a symmetrical structural form relative to the rotating shaft of the middle-focus rotating component; and the two electromagnets are utilized to realize accurate mechanical positioning on the short-focus working mode and the medium-focus working mode of the multiplying power switching device.

Description

Multiplying power switching device for three-gear zoom lens

Technical Field

The invention belongs to the technical field of optical lenses, and relates to a multiplying power switching device for a three-gear zoom lens.

Background

Switching devices for three-gear zoom lenses are available in the prior art, but two rotating assemblies of the devices need to be driven by separate motors, so that the switching devices are complicated and tedious. The three-gear zoom lens using the switching devices has too large volume and weight, so that the use places are limited, and the universal application cannot be realized.

Disclosure of Invention

Objects of the invention

The purpose of the invention is: the magnification switching device for the three-gear zoom lens is simple and compact in structure and accurate in positioning, and one motor is used for controlling the two rotating assemblies.

(II) technical scheme

In order to solve the technical problem, the invention provides a magnification switching device for a three-gear zoom lens, which is arranged between a front lens group and a rear lens group of the three-gear zoom lens, and comprises a lens barrel 1, a motor 2, a driving gear 3, a driven gear 4, an idler gear 5, a first bearing assembly 6, a second bearing assembly 7, a first bevel gear 8, a second bevel gear 9, a third bevel gear 10, a fourth bevel gear 11, a short-focus rotating assembly 12 and a middle-focus rotating assembly 13; a middle focus rotating assembly 13 and a short focus rotating assembly 12 are respectively arranged in the lens barrel 1 from front to back; the exterior of the lens-barrel 1 sets up the electrical machinery 2, the driving gear 3 is fixedly connected to the output shaft of the electrical machinery 2, form the gear pair with the driven gear 4; the driven gear 4 is fixedly connected with the rear end of the first bearing assembly 6, and forms an intermittent matching mechanism with the idle gear 5 fixedly connected with the front end of the bearing assembly 7, after the idle gear 5 is driven by the driven gear 4 to rotate, if the driven gear 4 rotates reversely, the idle gear 5 can be continuously driven to rotate after the idle gear 4 rotates 90 degrees; the first bevel gear 8 is fixedly connected with the front end of the bearing assembly 6 and forms a gear pair with a second bevel gear 9 fixedly connected with the upper end of the middle coke rotating assembly 13; the third bevel gear 10 is fixedly connected to the rear end of the bearing assembly 7 and forms a gear pair with a fourth bevel gear 11 fixedly connected to the upper end of the short-focus rotating assembly 12; the middle focus rotating assembly 13 comprises a middle focus rotating frame 131, and a middle focus machine assembly 132 and a middle focus machine assembly 133 which are arranged on one set of opposite side walls, wherein the other set of opposite side walls of the middle focus rotating frame 131 are arranged in an opening way; the short-focus rotating assembly 12 comprises a short-focus rotating frame 121, and a short-focus optical engine assembly 122 and a short-focus optical engine assembly 123 which are arranged on one set of opposite side walls of the short-focus rotating frame, wherein the other set of opposite side walls of the short-focus rotating frame 121 are arranged in an opening manner; in an initial state, the optical axis is cut out of the intermediate focus rotating assembly 13, the short focus rotating assembly 12 is located in the optical axis, and the magnification switching device is in a short focus working mode; the motor 2 rotates in the positive direction by 90 degrees, the middle-focus rotating assembly 13 cuts into an optical axis, the short-focus rotating assembly 12 cuts out the optical axis, and the multiplying power switching device is in a middle-focus working mode; then the motor 2 rotates 90 degrees in the negative direction, the optical axis is cut out by the middle-focus rotating assembly 13, the short-focus rotating assembly 12 is kept still, and the multiplying power switching device is in a long-focus working mode; the motor 2 continues to rotate 90 degrees in the negative direction, the middle-focus rotating assembly 13 is switched into the optical axis, the short-focus rotating assembly 12 is switched into the optical axis, and the multiplying power switching device is not in a working mode; then the motor 2 rotates 90 degrees in the forward direction, the optical axis is cut out by the middle-focus rotating assembly 13, the short-focus rotating assembly 12 is kept still, and the multiplying power switching device returns to the initial working state, namely the short-focus working mode.

(III) advantageous effects

The multiplying power switching device for the three-gear zoom lens is simple in structure and flexible in movement, one motor is used for controlling the two rotating assemblies to complete switching among short-focus, middle-focus and long-focus working modes of the multiplying power switching device, mechanical accurate positioning is achieved by the aid of the two electromagnets, and difficulty of a control system is reduced. The volume and the weight of the three-gear zoom lens using the device are greatly reduced, and the three-gear zoom lens can be widely applied in more places.

Drawings

FIG. 1 is a sectional view of a three-step zoom lens to which the present invention is applied.

Fig. 2 is a schematic view of a magnification switching device.

Fig. 3 is a schematic sectional view of the magnification switching device.

Fig. 4 is a schematic view of a driven gear and idler gear matching structure.

Fig. 5 is a schematic view of a driven gear.

FIG. 6 is a schematic view of an idler.

Fig. 7 is a schematic diagram of the magnification switching apparatus after hiding the short-focus rotating assembly.

Wherein: the device comprises a lens barrel 1, a motor 2, a driving gear 3, a driven gear 4, an idler gear 5, a first bearing assembly 6, a second bearing assembly 7,

bevel gears

8, 9, 10 and 11, a short-focus rotating assembly 12, a middle-focus rotating assembly 13, a first electromagnet 14 and a second electromagnet 15.

The first bearing assembly 6 includes: bearing

seats

61, 62 support the shaft, bearings 63, 64, and bearing end caps 65, 66.

The short focus rotary assembly 12 includes: 121-short-focus rotating frame, 122-short-focal-length optical-mechanical assembly, 123-short-focal-length optical-mechanical assembly, 124-upper shaft pin, 125-lower shaft pin, 126 and 127 bearings, and 128 and 129 bearing end cover.

The middle coke rotating assembly 13 includes: 131-a middle focus rotating frame, 132-a middle focus optical machine component, 133-a middle focus optical machine component, 134-an upper shaft pin, 135-a lower shaft pin, 136, 137 bearings, 138, 139 bearing end covers.

Detailed Description

In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.

As shown in fig. 1, a three-gear zoom lens includes a front lens group, a rear lens group and a magnification switching device disposed therebetween, and the focal length of the three-gear zoom lens is changed by the magnification switching device.

As shown in fig. 2 to 7, the magnification switching device used in the three-speed zoom lens includes a lens barrel 1, a motor 2, a driving gear 3, a driven gear 4, an idler gear 5, a first bearing assembly 6, a second bearing assembly 7, a first bevel gear 8, a second bevel gear 9, a third bevel gear 10, a fourth bevel gear 11, a short-focus rotating assembly 12, a middle-focus rotating assembly 13, a first electromagnet 14, and a second electromagnet 15.

The front end of the lens cone 1 is provided with a front hole coaxial with the front lens group of the third-gear zoom lens, and the rear end is provided with a rear hole coaxial with the rear lens group of the third-gear zoom lens; a middle focus rotating assembly 13 and a short focus rotating assembly 12 are respectively arranged in the lens barrel 1 from front to back; the exterior of the lens-barrel 1 sets up the electrical machinery 2, the driving gear 3 is fixedly connected to the output shaft of the electrical machinery 2, form the gear pair with the driven gear 4; the driven gear 4 is fixedly connected with the rear end of the first bearing assembly 6 and forms an intermittent matching mechanism with the idle gear 5 fixedly connected with the front end of the bearing assembly 7; the driven gear 4 and the idle gear 5 have a special structure form, so that after the driven gear 4 drives the idle gear 5 to rotate, if the driven gear 4 rotates reversely, the idle gear 5 can be continuously driven to rotate after the idle gear 4 rotates 90 degrees. The first bevel gear 8 is fixedly connected with the front end of the bearing assembly 6 and forms a gear pair with a second bevel gear 9 fixedly connected with the upper end of the middle coke rotating assembly 13; the third bevel gear 10 is fixedly connected to the rear end of the bearing assembly 7, and forms a gear pair with a fourth bevel gear 11 fixedly connected to the upper end of the short-focus rotating assembly 12. The middle focus rotating assembly 13 comprises a middle focus rotating frame 131, and a middle focus machine assembly 132 and a middle focus machine assembly 133 which are arranged on one set of opposite side walls, wherein the other set of opposite side walls of the middle focus rotating frame 131 are arranged in an opening way; the short-focus rotating assembly 12 comprises a short-focus rotating frame 121, and a short-focus optical-mechanical assembly 122 and a short-focus optical-mechanical assembly 123 which are installed on one set of opposite side walls of the short-focus rotating frame 121, wherein the other set of opposite side walls of the short-focus rotating frame 121 are arranged in an opening mode.

The rear part in the lens barrel 1 is provided with a first electromagnet 14 and a second electromagnet 15, the first electromagnet 14 is positioned at the bottom of the lens barrel and the axial direction thereof is vertical to the central axial direction of the lens barrel 1, and the second electromagnet 15 is positioned at the top of the lens barrel and the axial direction thereof is vertical to the axial direction of the first electromagnet 14; the first electromagnet 14 and the second electromagnet 15 are located at the right side portion of the lens barrel 1, defined in the clockwise direction, the front, right, rear, and left directions. The first electromagnet 14 provides a short-focus working position for the short-focus rotating frame 121, and keeps the inner hole of the short-focus rotating frame 121 coaxial with the lens barrel front hole and the lens barrel rear hole. The second electromagnet 15 provides a working position of the middle focus for the middle focus rotating frame 131, and keeps the inner hole of the middle focus rotating frame 131 coaxial with the lens barrel front hole and the lens barrel rear hole.

Fig. 2 shows an initial state of the magnification switching device, in which the optical axis is cut out of the middle-focus rotating assembly 13, the short-focus rotating assembly 12 is located in the optical axis, and the magnification switching device is in the short-focus operating mode; the motor 2 rotates in the positive direction by 90 degrees, the middle-focus rotating assembly 13 cuts into an optical axis, the short-focus rotating assembly 12 cuts out the optical axis, and the multiplying power switching device is in a middle-focus working mode; then the motor 2 rotates 90 degrees in the negative direction, the optical axis is cut out by the middle-focus rotating assembly 13, the short-focus rotating assembly 12 is kept still, and the multiplying power switching device is in a long-focus working mode; the motor 2 continues to rotate 90 degrees in the negative direction, the middle-focus rotating assembly 13 is switched into the optical axis, the short-focus rotating assembly 12 is switched into the optical axis, and the multiplying power switching device is not in a working mode; then the motor 2 rotates 90 degrees in the forward direction, the optical axis is cut out by the middle-focus rotating assembly 13, the short-focus rotating assembly 12 is kept still, and the multiplying power switching device returns to the initial working state, namely the short-focus working mode. The short-focus operating mode is mechanically positioned by the first electromagnet 14, and the middle-focus operating mode is mechanically positioned by the second electromagnet 15. The long-focus working mode of the multiplying power switching device does not need precise mechanical positioning because the short-focus rotating assembly and the middle-focus rotating assembly cut out the optical axis.

The first bearing assembly 6 and the second bearing assembly 7 have the same structure, the first bearing assembly 6 comprises a bearing seat 61, a support shaft 62, bearings 63 and 64 and bearing end covers 65 and 66, the support shaft 62 penetrates through the bearing seat 61, the front end and the rear end between the support shaft 62 and the bearing end covers are respectively arranged and sleeved on the bearings 63 and 64 on the support shaft 62, and the bearing end covers 65 and 66 are respectively arranged at the two ends of the bearing seat 61. The first bevel gear 8 is provided at the front end of the support shaft 62, and the driven gear 4 is provided at the rear end of the support shaft 62.

The short-focus rotating assembly 12 further comprises an upper shaft pin 124, a lower shaft pin 125,

bearings

126, 127 and bearing

end caps

128, 129; the upper shaft pin 124 and the lower shaft pin 125 are respectively arranged at the upper end and the lower end of the short-focus rotating frame 121, the upper shaft pin 124 passes through the lens barrel 1 through the bearing 126, the lens barrel 1 is provided with a bearing end cover 128 covering the bearing 126, and the fourth bevel gear 11 is arranged at the upper end of the upper shaft pin 124; the lower shaft pin 125 passes through the lens barrel 1 through a bearing 127, and a bearing end cover 129 covering the bearing 127 is arranged on the lens barrel 1.

The middle coke rotating component 13 comprises an upper shaft pin 134, a lower shaft pin 135,

bearings

136 and 137 and bearing end covers 138 and 139; the upper shaft pin 134 and the lower shaft pin 135 are respectively arranged at the upper end and the lower end of the middle-focus rotating frame 131, the upper shaft pin 134 passes through the lens barrel 1 through the bearing 136, the lens barrel 1 is provided with a bearing end cover 138 covering the bearing 136, and the second bevel gear 9 is arranged at the upper end part of the upper shaft pin 134; the lower shaft pin 135 passes through the lens barrel 1 through a bearing 137, and a bearing end cover 139 covering the bearing 137 is disposed on the lens barrel 1. The middle focus module 132 and the middle focus module 133 are designed to be symmetrical with respect to the rotation axis of the middle focus rotating module.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. A multiplying power switching device for a three-gear zoom lens is arranged between a front lens group and a rear lens group of the three-gear zoom lens and is characterized by comprising a lens barrel (1), a motor (2), a driving gear (3), a driven gear (4), an idler gear (5), a first bearing assembly (6), a second bearing assembly (7), a first bevel gear (8), a second bevel gear (9), a third bevel gear (10), a fourth bevel gear (11), a short-focus rotating assembly (12) and a middle-focus rotating assembly (13); a middle focus rotating assembly (13) and a short focus rotating assembly (12) are respectively arranged in the lens barrel (1) from front to back; a motor (2) is arranged outside the lens barrel (1), and a driving gear (3) is fixedly connected to an output shaft of the motor (2) and forms a gear pair with a driven gear (4); the driven gear (4) is fixedly connected to the rear end of the first bearing assembly (6) and forms an intermittent matching mechanism with the idler gear (5) fixedly connected to the front end of the second bearing assembly (7), and after the driven gear (4) drives the idler gear (5) to rotate, if the driven gear (4) rotates reversely, the idler gear (5) can be continuously driven to rotate after the driven gear (4) rotates for 90 degrees; the first bevel gear (8) is fixedly connected to the front end of the first bearing assembly (6) and forms a gear pair with a second bevel gear (9) fixedly connected to the upper end of the middle-focus rotating assembly (13); the third bevel gear (10) is fixedly connected to the rear end of the second bearing assembly (7) and forms a gear pair with a fourth bevel gear (11) fixedly connected to the upper end of the short-focus rotating assembly (12); the middle focus rotating assembly (13) comprises a middle focus rotating frame (131), a first middle focus machine assembly (132) and a second middle focus machine assembly (133) which are arranged on one group of opposite side walls of the middle focus rotating frame, and the other group of opposite side walls of the middle focus rotating frame (131) are arranged in an opening mode; the short-focus rotating assembly (12) comprises a short-focus rotating frame (121) and a first short-focus optical machine assembly (122) and a second short-focus optical machine assembly (123) which are arranged on one group of opposite side walls of the short-focus rotating frame, and the other group of opposite side walls of the short-focus rotating frame (121) are arranged in an opening mode; in an initial state, an optical axis is cut out of the intermediate focus rotating assembly (13), the short focus rotating assembly (12) is located in the optical axis, and the multiplying power switching device is in a short focus working mode; the motor (2) rotates in the positive direction by 90 degrees, the middle-focus rotating assembly (13) cuts into an optical axis, the short-focus rotating assembly (12) cuts out the optical axis, and the multiplying power switching device is in a middle-focus working mode; then the motor (2) rotates 90 degrees in the negative direction, the optical axis is cut out by the middle-focus rotating assembly (13), the short-focus rotating assembly (12) is kept still, and the multiplying power switching device is in a long-focus working mode; the motor (2) continues to rotate 90 degrees in the negative direction, the middle-focus rotating assembly (13) is switched into the optical axis, the short-focus rotating assembly (12) is switched into the optical axis, and the multiplying power switching device is not in a working mode; and then the motor (2) rotates forwards by 90 degrees, the optical axis is cut out by the middle-focus rotating assembly (13), the short-focus rotating assembly (12) is kept still, and the multiplying power switching device returns to the initial working state, namely the short-focus working mode.

2. The magnification shifting apparatus for a three-speed zoom lens according to claim 1, wherein the barrel (1) has a front hole at a front end thereof, the front hole being coaxial with the front lens group of the three-speed zoom lens, and a rear hole at a rear end thereof, the rear hole being coaxial with the rear lens group of the three-speed zoom lens.

3. The magnification switching apparatus for a three-gear zoom lens according to claim 2, wherein the lens barrel (1) is provided at a rear portion thereof with a first electromagnet (14) and a second electromagnet (15), the first electromagnet (14) is located at a bottom portion thereof and has an axial direction perpendicular to a central axis of the lens barrel (1), the second electromagnet (15) is located at a top portion thereof and has an axial direction perpendicular to the first electromagnet (14); the first electromagnet (14) and the second electromagnet (15) are positioned at the right side part of the lens barrel (1) and are defined by the directions of clockwise, front, right, back and left; the first electromagnet (14) provides a short-focus working position for the short-focus rotating frame (121), and an inner hole of the short-focus rotating frame (121) is coaxial with a lens barrel front hole and a lens barrel rear hole; the second electromagnet (15) provides a working position of the middle focus for the middle focus rotating frame (131), and an inner hole of the middle focus rotating frame (131) is coaxial with a lens barrel front hole and a lens barrel rear hole.

4. The magnification switching device for a three-speed zoom lens according to claim 3, wherein the first bearing assembly (6) comprises a bearing seat (61), a support shaft (62), two bearings and two bearing end caps, the support shaft (62) passes through the bearing seat (61), the front end and the rear end between the support shaft and the bearing seat are respectively provided with a bearing sleeved on the support shaft (62), and the two ends of the bearing seat (61) are respectively provided with a bearing end cap; the first bevel gear (8) is arranged at the front end of the supporting shaft (62), and the driven gear (4) is arranged at the rear end of the supporting shaft (62).

5. The magnification switching apparatus for a three-speed zoom lens according to claim 4, wherein the short-focus rotating assembly (12) further includes a first upper shaft pin (124), a first lower shaft pin (125); the first upper shaft pin (124) and the first lower shaft pin (125) are respectively arranged at the upper end and the lower end of the short-focus rotating frame (121), and the short-focus rotating frame (121) rotates around the first upper shaft pin (124) and the first lower shaft pin (125).

6. The magnification switching apparatus for a three-speed zoom lens according to claim 5, wherein the first upper shaft pin (124) passes through the lens barrel (1) through a bearing, a bearing end cap covering the bearing is provided on the lens barrel (1), and the fourth bevel gear (11) is provided at the upper end of the first upper shaft pin (124); the first lower shaft pin (125) passes through the lens barrel (1) through a bearing, and a bearing end cover covering the bearing is arranged on the lens barrel (1).

7. The magnification switching apparatus for a three-speed zoom lens according to claim 6, wherein the middle focus rotating unit (13) includes a second upper shaft pin (134), a second lower shaft pin (135); the second upper shaft pin (134) and the second lower shaft pin (135) are respectively arranged at the upper end and the lower end of the middle-focus rotating frame (131), and the middle-focus rotating frame (131) rotates around the second upper shaft pin (134) and the second lower shaft pin (135).

8. The magnification switching apparatus for a three-speed zoom lens according to claim 7, wherein the second upper shaft pin (134) passes through the lens barrel (1) through a bearing, a bearing end cap (138) covering the bearing is provided on the lens barrel (1), and the second bevel gear (9) is provided at an upper end portion of the second upper shaft pin (134); the lower shaft pin passes through the lens cone (1) through a bearing, and a bearing end cover covering the bearing is arranged on the lens cone (1).