CN210221728U - Torsion testing device for film lens - Google Patents

Abstract

A torsion testing device for a film lens comprises: the moment detection mechanism for testing the torque value of lens focusing and the lens fixing mechanism for fixing the lens to be tested, wherein: the camera lens that awaits measuring is located camera lens fixed establishment and contacts with moment detection mechanism, and moment detection mechanism includes: the stepping motor driver is connected with the stepping motor, the gear assembly is in contact with the lens, and the torsion sensor is respectively connected with the stepping motor and the gear assembly through the coupler. The utility model arranges the gear for testing on the side of the lens focusing ring, reduces the influence of radial force and bending moment on the moment value, and improves the measuring accuracy; the lens is fixed by adopting a pre-tightening block and a movably arranged base conversion plate, so that the cost is reduced and the operation is facilitated; the moment detection mechanism ensures the coaxiality and approximate center height of the stepping motor, the torque sensor and the lens focusing gear, so that a micro torque difference can output a proportional signal.

Description

Torsion testing device for film lens

Technical Field

The utility model relates to a technique in torsion testing arrangement field specifically is a film camera lens torsion testing arrangement.

Background

Most of the existing torsion testing devices are mechanical and need manual rotation, and an instrument pointer displays an approximate torsion value. The method is influenced by manual rotation speed and force application magnitude, and cannot meet the requirement of high-precision torque force testing. In the lens rotation focusing process, torsion cannot be the same, the torsion changes during rotation, the requirement of the film lens industry on torsion accuracy is strict, the accuracy needs to reach 1-2 Ncm, and if the accuracy cannot be met, the influence on a picture after the focus follower is carried is larger.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the aforesaid to prior art exists is not enough, provides a film camera lens torsion testing arrangement, through the improvement of the direction of applying and step motor, torque sensor and the axiality of gear assembly and approximate central height of improving camera lens fixed establishment and torsion, has realized the torsion measurement of high accuracy.

The invention is realized by the following technical scheme:

the utility model discloses a: the moment detection mechanism for testing the torque value of lens focusing and the lens fixing mechanism for fixing the lens to be tested, wherein: the lens to be detected is positioned in the lens fixing mechanism and is contacted with the moment detection mechanism.

The torque detection mechanism includes: step motor, torque sensor, gear assembly and step motor driver, wherein: the torque sensor is respectively connected with the stepping motor and the gear assembly through the coupler, the stepping motor driver is connected with the stepping motor, and the rotating speed and the rotating direction of the motor are controlled through the electric pulse frequency.

The gear assembly includes: the gear piece and the gear that cooperate each other.

The torque sensor and the gear assembly are connected with the coupler through a bearing sleeve, wherein: the bearing sleeve is respectively connected with the strain shafts of the torsion sensors at two ends and the gear block through an internal connecting rod.

The lens fixing mechanism includes: set up support, fixed hand (hold), pretension piece and bottom plate conversion piece on the bottom plate, wherein: the bracket is fixed on the bottom plate through the pre-tightening block and the bottom plate conversion plate, and the bottom plate conversion plate is connected with the bottom plate through the fixing handle.

The side of the bottom plate conversion block is provided with a positioning pin to determine the relative position of the bottom plate conversion plate and the bottom plate, and the base conversion block can slide left and right on the base to realize the installation and the disassembly of the lens.

Technical effects

Compared with the prior art, the utility model arranges the gear for testing on the side of the lens focusing ring, reduces the influence of radial force and bending moment on the moment value, and improves the measuring accuracy; the lens is fixed by adopting a pre-tightening block and a movably arranged base conversion plate, so that the cost is reduced and the operation is facilitated; the moment detection mechanism ensures the coaxiality and approximate center height of the stepping motor, the torque sensor and the lens focusing gear, so that a micro torque difference can output a proportional signal.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a top view of the present invention;

FIG. 3 is a cross-sectional view taken along line X-X of FIG. 2;

FIG. 4 is a cross-sectional view taken along line Y-Y of FIG. 2;

in the figure: the device comprises a stepping motor 1, a motor support 2, a first coupler 3, a torsion sensor 4, a second coupler 5, a bearing sleeve 6, a gear block 7, a fixed handle 8, a lens to be measured 9, a pre-tightening block 10, a bottom plate conversion block 11, a positioning pin 12, a stepping motor driver 13, a gear 14, a bottom plate 15, a support 16, a gear assembly 17, a lens fixing mechanism 18, a hole 19, a strain shaft 20 and a connecting rod 21.

Detailed Description

As shown in fig. 1 to 3, the present embodiment includes: set up on bottom plate 15 and consecutive step motor 1, motor support 2, first shaft coupling 3, torque sensor 4, second shaft coupling 5, bearing housing 6 and gear assembly 17 to and step motor driver 13 and camera lens fixed establishment 18, wherein: the stepping motor driver 13 is connected with the stepping motor 1 and the lens 9 to be measured, the lens 9 to be measured is fixed by the lens fixing mechanism 18, and the gear assembly 17 is contacted with the lens 9 and measures a torsion value through the torsion sensor 4.

The gear assembly 17 comprises: the gear 14 is arranged on the gear block 7 through three screws so as to be matched with gears 14 of different specifications, the standard part is tested for multiple times, and the coaxiality of the gear 14 and the gear block 7 is adjusted in the closest state. As shown in figure 1, the front end of the gear block 7 is provided with three screw holes for fixing the gear 14.

The first coupler 3 and the second coupler 5 are SPCB membrane elastic couplers, and the couplers can reduce the influence of vibration and coaxiality.

As shown in fig. 3, the bearing housing 6 is connected to the strain shafts 20 of the torsion sensors 4 at both ends and the gear block 7 through the inner connecting rod 21, and the strain shafts 20 transmit torsion to the strain gauges of the torsion sensors 4 through the second coupling 5.

As shown in fig. 4, the lens holding mechanism 18 includes: the bracket 16, the fixed handle 8, the two pre-tightening blocks 10, the bottom plate conversion block 11 and the positioning pin 12 which are arranged on the bottom plate 15 are restrained by the bracket 14 at the bottom of the lens to fix the lens. Wherein: the fixing handle 8 fixes the bottom plate conversion block 11 on the bottom plate 15 through a kidney-shaped hole groove on the bottom plate conversion block 11, and the fixing handle 8 can control the fixing and the loosening of the bottom plate conversion block 11; the support 16 is fixed on the bottom plate 15 by the bottom plate conversion block 11 and the two pre-tightening blocks 10, and the support 16 is matched with the groove on the bottom plate 15 through control tolerance to restrain the lens in the horizontal front and back directions; the pretension blocks on the two sides can regulate the tightness of the bracket through the arrangement of bolts connected with the bottom plate adapter block 11, so that the lens is restrained in the horizontal left-right direction. The positioning pin 12 is arranged on the bottom plate 15 and contacts with the bottom plate conversion block 11 to determine the relative position of the two, and the base conversion block can slide left and right on the base to realize the installation and the disassembly of the lens.

The pre-tightening block 10 is provided with two holes 19, and the diameter of each hole is larger than that of a bolt arranged at the positions of the pre-tightening block 10 and the bottom plate adapter block 11 so as to adjust the matching degree of the pre-tightening block 10 and the bracket 16.

The device drives a lens to focus through a stepping motor 1, after a dynamic torque sensor 4 obtains a corresponding torque value, the resistance value of a strain gauge on a strain shaft changes correspondingly, the converted electric signal is converted into a frequency signal in direct proportion to the torque through voltage/frequency conversion, a modulation circuit is used for shaping and outputting a frequency modulation square wave signal, and finally, the corresponding torque value is displayed on a torque power meter.

Compared with the prior art, the utility model has the advantages that the human factors of the mechanical torque tester are eliminated, the rotating speed can be accurately controlled, and the standardized torque force inspection standard is realized; the accuracy of the torsion can reach 1-2 Ncm, and the torsion is more accurate compared with other torsion instruments, so that the requirement of a movie lens on severe torsion can be met; simple structure is effective, and is with low costs, is favorable to production more.

The foregoing embodiments may be modified in various ways by those skilled in the art without departing from the spirit and scope of the present invention, which is not limited by the above embodiments but is to be accorded the full scope defined by the appended claims, and all such modifications and variations are within the scope of the invention.

Claims (7)

1. A movie lens torsion testing device, characterized by includes: the moment detection mechanism for testing the torque value of lens focusing and the lens fixing mechanism for fixing the lens to be tested, wherein: the camera lens that awaits measuring is located camera lens fixed establishment and contacts with moment detection mechanism, and this moment detection mechanism includes: step motor, torque sensor, gear assembly and step motor driver, wherein: the stepping motor driver is connected with the stepping motor, the gear assembly is in contact with the lens, and the torsion sensor is respectively connected with the stepping motor and the gear assembly through the coupler.

2. The cine lens torque testing apparatus according to claim 1, wherein the lens fixing mechanism comprises: set up support, fixed hand (hold), pretension piece and bottom plate conversion piece on the bottom plate, wherein: the bracket is fixed on the bottom plate through the pre-tightening block and the bottom plate conversion plate, and the bottom plate conversion plate is connected with the bottom plate through the fixing handle.

3. The cinematographic lens torque testing device according to claim 1 wherein the gear assembly comprises: the gear piece and the gear that cooperate each other.

4. The cinematographic lens torque force testing device according to claim 3, wherein the torque sensor and gear assembly are connected to a coupling through a bearing housing, wherein: the bearing sleeve is respectively connected with the strain shafts of the torsion sensors at two ends and the gear block through an internal connecting rod.

5. The apparatus for testing torsional force of a film lens as in claim 2, wherein the bottom plate conversion block is provided with positioning pins at its sides for determining the relative positions of the bottom plate conversion plate and the bottom plate.

6. The device for testing torsional force of a movie lens as in claim 2, wherein the pre-tightening block is provided with two holes, and the gap between the pre-tightening block and the bracket can be adjusted by arranging a bolt connected with the bottom plate adapter block, so as to adjust the degree of fit.

7. The apparatus for testing torsional force of a movie lens as in claim 2 or 5 wherein the bottom plate switch plate is provided with a slot for moving the lens by adjusting the tightness of the fixed handle.

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