Guide mechanism of novel continuous zoom lens

Abstract

The invention discloses a guide mechanism of a novel continuous zoom lens. The guide mechanism comprises a main lens barrel, a zoom cam assembly, a lubricating ring, a front end cover, a zoom lens base, a driving guide nail assembly, a linear bearing, a precision polish rod and a pressing plate. The zoom cam assembly is installed on the main lens barrel, the front and back of the zoom cam assembly are respectively provided with a group of lubricating rings, and the zoom cam assembly and the two groups of lubricating rings are fixed through the front end cover; one end of the precision polished rod is mounted on the three groups of mounting holes of the main lens barrel, and the other end of the precision polished rod is mounted on the three groups of mounting holes of the front end cover; the linear bearings are mounted in three groups of mounting holes in the zoom lens seat and are fixed through the pressing plate; the driving guide nail assembly passes through the zoom cam assembly and the main lens barrel and is installed on the zoom lens base in a threaded connection mode. According to the invention, the driving torque of the zoom lens base can be reduced, the motion precision and stability of the zoom lens base are improved, and the processing cost of structural members is controlled.

Description

Technical Field

[0001] The invention belongs to the field of optical machine design and relates to a novel guide mechanism of a continuous zoom lens. Background Art

[0002] The guide mechanism of the traditional continuous zoom lens is realized through the cylindrical mating surface between the zoom lens holder and the main lens barrel. Although the structure of this guide mechanism is relatively simple, it also has prominent disadvantages: 1) There is sliding friction between the zoom lens holder and the main lens barrel, and the friction coefficient is relatively large, which will increase the driving torque of the zoom lens holder and require a high output load of the driving motor; 2) After repeated movements, there is a risk of wear between the mating surfaces of the zoom lens holder and the main lens barrel, which will affect the movement accuracy of the zoom lens holder on the one hand; on the other hand, it will produce excess material, causing the zoom lens holder to get stuck during the movement process, affecting the movement stability; 3) The processing requirements for the dimensional tolerance, shape and position tolerance, fitting clearance and surface roughness of the zoom lens holder and the main lens barrel are relatively high, which increases the processing cost of the structural parts. Summary of the invention

[0003] (I) Purpose of the invention

[0004] The purpose of the present invention is to provide a novel guide mechanism for a continuous zoom lens, reduce the driving torque of the zoom lens mount, improve the movement accuracy and stability of the zoom lens mount, and control the processing cost of the structural parts.

[0005] (II) Technical solution

[0006] In order to solve the above technical problems, the present invention provides a novel guiding mechanism of a continuous zoom lens, which comprises: a main lens barrel, a zoom cam assembly, a lubricating ring, a front end cover, a zoom lens seat, a driving guide pin assembly, a linear bearing, a precision optical rod and a pressure plate; the zoom cam assembly is mounted on the main lens barrel, and a group of lubricating rings are respectively provided at the front and rear of the zoom cam assembly, and the zoom cam assembly and the two groups of lubricating rings are fixed by the front end cover; the linear bearing is mounted on the precision optical rod, and one end of the precision optical rod is mounted on three groups of mounting holes of the main lens barrel, and the other end is mounted on three groups of mounting holes of the front end cover; the linear bearing is mounted in the three groups of mounting holes on the zoom lens seat and fixed by the pressure plate; the driving guide pin assembly passes through the zoom cam assembly and the main lens barrel and is installed on the zoom lens seat by a threaded connection.

[0007] There are two groups of zoom lens mounts, which are respectively denoted as zoom lens mount I and zoom lens mount II. Zoom lens mount I and zoom lens mount II are coaxially arranged, and lens assemblies are respectively mounted thereon.

[0008] Among them, the zoom lens seat I is a cylindrical tube, and three mounting seats are evenly spaced on its outer wall. A group of mounting holes are opened on each mounting seat. A precision light rod passes through each mounting seat parallel to the axial direction, and the precision light rod passes through the corresponding linear bearing. A driving guide pin assembly is connected to each mounting seat in the radial direction.

[0009] The structure type and installation method of the zoom lens mount I and the zoom lens mount II are the same.

[0010] Among them, there are two groups of lubricating rings, one group is located between the zoom cam assembly and the outer wall step of the main lens barrel, and the other group is located between the zoom cam assembly and the front end cover.

[0011] Among them, three groups of mounting holes are processed on the main lens barrel and the front end cover respectively by a high-precision boring machine, and the processing dimensions of the mounting holes match the outer diameter dimensions of the precision polished rod.

[0012] Among them, among the three groups of mounting holes on the zoom lens mount, one group is the matching mounting holes, and the other two groups are the adjustment mounting holes; the processing dimensions of the matching mounting holes match the outer diameter dimensions of the linear bearings, and the processing dimensions of the two groups of adjustment mounting holes are larger than the outer diameter dimensions of the linear bearings, leaving adjustment margin for the zoom lens mount in the radial direction.

[0013] Among them, the linear bearings in the matching mounting holes are fixed by a pressure plate, and then the radial orientation of the zoom lens holder is adjusted. After the adjustment is completed, the linear bearings on the two sets of adjustment mounting holes are fixed by the pressure plate.

[0014] (III) Beneficial effects

[0015] The guide mechanism of the novel continuous zoom lens provided by the above technical solution adopts a combination of linear bearings and precision optical rods as the guide mechanism of the continuous zoom lens, which can reduce the driving torque of the zoom lens mount, improve the movement accuracy and stability of the zoom lens mount, and control the processing cost of the structural parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 To guide the structure diagram of the organization.

[0017] Figure 2 Schematic diagram of the mounting holes for the main lens barrel and the front end cover.

[0018] Figure 3 Schematic diagram of the zoom lens mount.

[0019] Figure 4 Schematic diagram of the pressure plate.

[0020] Figure 5 This is a structural diagram of the guide mechanism of a certain type of infrared continuous zoom lens. DETAILED DESCRIPTION

[0021] 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 in conjunction with the drawings and examples.

[0022] like Figure 1 As shown, the guide mechanism of the novel continuous zoom lens of this embodiment includes: a main lens barrel, a zoom cam assembly, a lubricating ring, a front end cover, a zoom lens mount, a driving guide pin assembly, a linear bearing, a precision optical rod and a pressure plate;

[0023] The zoom cam assembly is installed on the main lens barrel. There is a set of lubricating rings at the front and back of the zoom cam assembly. The zoom cam assembly and the two sets of lubricating rings are fixed by the front end cover; the linear bearing is installed on the precision light rod, one end of the precision light rod is installed on the three sets of mounting holes of the main lens barrel, and the other end is installed on the three sets of mounting holes of the front end cover; the linear bearing is installed in the three sets of mounting holes on the zoom lens base and fixed by a pressure plate; the driving guide pin assembly passes through the zoom cam assembly and the main lens barrel and is installed on the zoom lens base by threaded connection.

[0024] like Figure 5 As shown, there are two groups of zoom lens mounts, which are respectively denoted as zoom lens mount I and zoom lens mount II. Zoom lens mount I and zoom lens mount II are coaxially arranged, and lens assemblies are respectively mounted thereon.

[0025] The zoom lens mount I is a cylindrical tube, and three mounting seats are evenly spaced on its outer wall. A group of mounting holes are opened on each mounting seat. A precision polished rod passes through each mounting seat parallel to the axial direction, and the precision polished rod passes through the corresponding linear bearing. A driving guide pin assembly is radially connected to each mounting seat.

[0026] The structure type and installation method of zoom lens mount I and zoom lens mount II are the same.

[0027] There are two groups of lubricating rings, one group is located between the zoom cam assembly and the outer wall step of the main lens barrel, and the other group is located between the zoom cam assembly and the front end cover.

[0028] like Figure 2 As shown, three groups of mounting holes are respectively machined on the main lens barrel and the front end cover by a high-precision boring machine, and the machining dimensions of the mounting holes match the outer diameter of the precision polished rod.

[0029] like Figure 3 As shown in the figure, three groups of mounting holes are processed on the zoom lens holder, one group is the matching mounting holes, and the other two groups are the adjustment mounting holes. The processing size of the matching mounting holes matches the outer diameter of the linear bearing, and the processing size of the two groups of adjustment mounting holes is slightly larger than the outer diameter of the linear bearing, ensuring that the zoom lens holder has a certain adjustment margin in the radial direction.

[0030] like Figure 4As shown, the zoom lens mount and the linear bearing are assembled through three sets of mounting holes on the zoom lens mount. The linear bearings in the matching mounting holes are directly fixed through the pressure plate, and then the radial position of the zoom lens mount is adjusted to ensure that the zoom lens mount is stable and smooth during the entire movement process without any jamming. After the adjustment is completed, the linear bearings on the two sets of adjustment mounting holes are fixed through the pressure plate.

[0031] In this embodiment, the polished rod model is SF3-g6-145L (manufacturer: THK); the linear bearing model is LM3 (manufacturer: THK).

[0032] The assembly process of the guide mechanism of this embodiment is as follows:

[0033] 1) Combine linear bearings with precision polished rods as the guide mechanism for the zoom lens mount;

[0034] 2) The main lens barrel and the front end cover are respectively machined with three sets of mounting holes by a high-precision boring machine. The machining dimensions of the mounting holes match the outer diameter of the precision polished rod. The linear bearing is installed on the precision polished rod. One end of the precision polished rod is installed on the three sets of mounting holes of the main lens barrel, and the other end is installed on the three sets of mounting holes of the front end cover.

[0035] 3) Three groups of mounting holes are processed on the zoom lens holder, one group is the matching mounting holes, and the other two groups are the adjustment mounting holes; the processing size of the matching mounting holes matches the outer diameter of the linear bearing, and the processing size of the adjustment mounting holes is slightly larger than the outer diameter of the linear bearing, to ensure that the zoom lens holder has a certain adjustment margin in the radial direction;

[0036] 4) The linear bearings are installed in the three groups of mounting holes on the zoom lens mount; the linear bearings in the mounting holes are fixed directly through the pressure plate, and then the radial position of the zoom lens mount is adjusted to ensure that the zoom lens mount is stable and smooth during the entire movement process without any jamming;

[0037] 5) After the adjustment is completed, the linear bearings in the two sets of adjustment mounting holes are fixed by the pressure plate;

[0038] 6) After installation, the zoom lens mount should be ensured to be stable and smooth throughout the entire movement process without any jamming;

[0039] 7) If jamming occurs, the radial position of the zoom lens mount needs to be readjusted until the jamming is eliminated.

[0040] It can be seen from the above technical scheme that the present invention adopts a combination of linear bearings and precision light rods as the guide mechanism of the continuous zoom lens. Compared with the traditional cylindrical surface matching guide method, the advantages of this method are: 1) linear bearings can convert sliding friction into rolling friction, reducing the driving torque of the zoom lens holder; 2) linear bearings and precision light rods are standard parts with high processing accuracy, which can improve the movement accuracy and stability of the zoom lens holder; 3) reduce the processing requirements of the dimensional tolerance, form and position tolerance, matching clearance and surface roughness of the zoom lens holder and the main lens barrel, and control the processing cost of the structural parts.

[0041] 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 novel guide mechanism for a continuous zoom lens, characterized in that: include: Main lens barrel, zoom cam assembly, lubrication ring, front end cover, zoom lens seat, drive guide pin assembly, linear bearing, precision light rod and pressure plate; the zoom cam assembly is installed on the main lens barrel, and there is a set of lubrication rings at the front and back of the zoom cam assembly, and the zoom cam assembly and the two sets of lubrication rings are fixed by the front end cover; the linear bearing is installed on the precision light rod, one end of the precision light rod is installed on the three sets of mounting holes of the main lens barrel, and the other end is installed on the three sets of mounting holes of the front end cover; the linear bearing is installed in the three sets of mounting holes on the zoom lens seat and fixed by the pressure plate; the drive guide pin assembly passes through the zoom cam assembly and the main lens barrel and is installed on the zoom lens seat by threaded connection.

2. The guide mechanism of the novel continuous zoom lens as claimed in claim 1, characterized in that: There are two groups of zoom lens mounts, which are respectively denoted as zoom lens mount I and zoom lens mount II. Zoom lens mount I and zoom lens mount II are coaxially arranged, and lens assemblies are respectively mounted thereon.

3. The guide mechanism of the novel continuous zoom lens as claimed in claim 2, characterized in that: The zoom lens mount I is a cylindrical tube, and three mounting seats are evenly spaced on its outer wall. A group of mounting holes are opened on each mounting seat. A precision polished rod passes through each mounting seat parallel to the axial direction, and the precision polished rod passes through the corresponding linear bearing. A driving guide pin assembly is radially connected to each mounting seat.

4. The guide mechanism of the novel continuous zoom lens as claimed in claim 3, characterized in that: The structure type and installation method of zoom lens mount I and zoom lens mount II are the same.

5. The guide mechanism of the novel continuous zoom lens as claimed in claim 4, characterized in that: There are two groups of lubricating rings, one group is located between the zoom cam assembly and the outer wall step of the main lens barrel, and the other group is located between the zoom cam assembly and the front end cover.

6. The guide mechanism of the novel continuous zoom lens as claimed in claim 5, characterized in that: Three groups of mounting holes are processed on the main lens barrel and the front end cover by a high-precision boring machine. The processing dimensions of the mounting holes match the outer diameter of the precision polished rod.

7. The guide mechanism of the novel continuous zoom lens as claimed in claim 6, characterized in that: Among the three groups of mounting holes on the zoom lens mount, one group is the matching mounting holes, and the other two groups are the adjustment mounting holes; the processing dimensions of the matching mounting holes match the outer diameter dimensions of the linear bearings, and the processing dimensions of the two groups of adjustment mounting holes are larger than the outer diameter dimensions of the linear bearings, leaving adjustment margin for the zoom lens mount in the radial direction.

8. The guide mechanism of the novel continuous zoom lens as claimed in claim 7, characterized in that: The linear bearings in the matching mounting holes are fixed by means of a pressure plate, and then the radial orientation of the zoom lens holder is adjusted. After the adjustment is completed, the linear bearings on the two sets of adjustment mounting holes are fixed by means of a pressure plate.

9. A continuous zoom lens, characterized in that: A guide mechanism comprising the novel continuous zoom lens as described in any one of claims 1-8.

10. Application of a guide mechanism of a novel continuous zoom lens according to any one of claims 1 to 8 in the field of optical machine design.

Images