CN220018903U - Lens focal length measuring device - Google Patents

Abstract

The utility model discloses a device for measuring focal length of a lens, which comprises a working platform and a fixing frame, wherein the upper end of the fixing frame is sequentially connected with a light pipe frame, a lens clamping piece and a sliding assembly, the light pipe frame is connected with a collimator, the lens clamping piece is connected with a lens, the sliding assembly is connected with a camera, one end of the working platform is connected with a control terminal, and the control terminal is electrically connected with the sliding assembly, the camera and the collimator. The utility model has simple structure, the camera is controlled to continuously change positions by the control terminal, projection size and brightness data at different positions are collected, the control terminal compares and judges the data, further, accurate focal length data is provided for workers, and the lens, the camera and the collimator are automatically adjusted to keep the same axis by measuring the position sliding distance of the clamping plates at two sides, so that the efficiency of the workers for detecting and selecting different lenses is greatly improved.

Description

Lens focal length measuring device

Technical Field

The utility model relates to the technical field of focal length measurement, in particular to a device for measuring focal length of a lens.

Background

The focal length is a fundamental parameter of an optical system, which must be known during assembly and calibration of the optical system, and the lens is the most fundamental element that makes up the optical system. The focal length of the lens is thus naturally an important parameter for determining its object-image relationship, while whether the focal length of the lens is accurate or not will directly affect the whole optical system.

In the optical cold working process, it is difficult to directly judge what kind of materials are used for the lens, confusion is prevented, the materials can be judged by accurately measuring the focal length of the lens, since each procedure can detect the surface shape by looking at the aperture through the template, the center thickness is measured by the dial indicator, if the surface shape and the center thickness are strictly controlled within the tolerance requirement range and the materials are used correctly, the focal length of the lens should be within the requirement range, and if not, the materials can be indicated to have problems.

In conventional focal length measurement, the focal length of a lens or optical system is measured by magnification, and the pitch of the glass plate image is read using an eyepiece micrometer with a microscope. Because the eyepiece micrometer self-structure is complicated, the imaging is unstable easily when the micro hand wheel is rotated in the measuring process, the convolution error is caused, and the requirement on an operator is higher because the operator only relies on subjective judgment, and meanwhile, the eyepiece micrometer self-structure has larger human error.

Disclosure of Invention

The utility model aims to solve the defects in the prior art and provides a device for measuring the focal length of a lens.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the device for measuring the focal length of the lens comprises a working platform, wherein the upper wall of the working platform is connected with a fixing frame, the upper end of the fixing frame is sequentially connected with a light pipe frame, a lens clamping piece and a sliding component, the acting end of the light pipe frame is connected with a collimator, the acting end of the lens clamping piece is detachably connected with a lens, the operating end of the sliding component is connected with a camera, one end of the working platform is connected with a control terminal, the control terminal is electrically connected with the sliding component, the camera and the collimator, and the control terminal is electrically connected with an external power supply;

the lens holder includes the base of being connected with the mount, and lifting cylinder is connected to base upper wall symmetry, and clamping platform is connected to lifting cylinder output, clamping platform upper wall bilateral symmetry sliding connection grip block, and base internally mounted has first motor, and flexible transfer line is connected to the ascending output coaxial heart of first motor, and flexible transfer line passes through gear drive and connects both sides grip block.

Preferably, the sliding component comprises a sliding table fixedly connected with the fixing frame, sliding rods are fixedly connected to two sides of the sliding table, sliding blocks are sleeved on the sliding rods in a sliding mode, the upper ends of the sliding blocks are horizontally connected with the camera, one end, far away from the lens clamping piece, of the sliding table is connected with the second motor, the output end of the second motor is connected with the threaded rod in a coaxial mode, the other end of the threaded rod is connected with the end portion of the sliding table in a rotating mode, and the sliding blocks are connected with the threaded rod in a threaded mode.

Preferably, the clamping platform is provided with a sliding groove corresponding to the clamping plate, the side wall of the clamping plate is connected with an L-shaped rack, the end part of the telescopic transmission rod penetrates through the clamping platform and is connected with a rotating gear, and the rotating gear is in transmission connection with the L-shaped racks on two sides.

Preferably, the clamping plates on the two corresponding sides of the clamping platform are all connected with the distance scale plate, and the side wall of the sliding table is connected with the distance scale plate.

Preferably, the inner walls of the clamping plates are connected with clamping pads, and the cross sections of the clamping pads adopt concave structures.

Compared with the prior art, the utility model has the beneficial effects that: the utility model has simple structure, the lens, the camera and the collimator are integrated through the working platform, the camera and the collimator keep the same axis, the camera is controlled to continuously change positions through the control terminal, projection size and brightness data at different positions are collected, the control terminal is used for comparing and judging the data, and further providing accurate focal length data for workers.

Drawings

In order to more particularly and intuitively illustrate an embodiment of the present utility model or a technical solution in the prior art, a brief description of the drawings is provided below, which are required to be used in the description of the embodiment or the prior art.

FIG. 1 is a schematic diagram of a first embodiment of the present utility model;

FIG. 2 is a schematic diagram of a second embodiment of the present utility model;

fig. 3 is a schematic view of a lens holder according to the present utility model.

In the figure: the lens holder comprises a working platform 1, a fixing frame 2, a light pipe frame 3, a lens holder 4, a sliding component 5, a collimator 6, a lens 7, a camera 8, a control terminal 9, a base 10, a lifting cylinder 11, a holding platform 12, a holding plate 13, a first motor 14, a telescopic transmission rod 15, a sliding table 16, a sliding rod 17, a sliding block 18, a second motor 19, a threaded rod 20, a holding pad 21, a scale plate 22, a sliding groove 23, an L-shaped rack 24 and a rotating gear 25.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

Referring to fig. 1-3, a device for measuring focal length of a lens comprises a working platform 1, wherein the upper wall of the working platform 1 is connected with a fixing frame 2, the upper end of the fixing frame 2 is sequentially connected with a light pipe frame 3, a lens clamping piece 4 and a sliding component 5, the acting end of the light pipe frame 3 is connected with a collimator 6, the acting end of the lens clamping piece 4 is detachably connected with a lens 7, the working end of the sliding component 5 is connected with a camera 8, one end of the working platform 1 is connected with a control terminal 9, the control terminal 9 is electrically connected with the sliding component 5, the camera 8 and the collimator 6, and the control terminal 9 is electrically connected with an external power supply;

the lens holder 4 includes the base 10 of being connected with mount 2, and lifting cylinder 11 is connected to base 10 upper wall symmetry, and clamping platform 12 is connected to lifting cylinder 11 output, clamping platform 12 upper wall bilateral symmetry sliding connection grip block 13, and base 10 internally mounted has first motor 14, and flexible transfer line 15 is connected to the ascending output coaxial heart of first motor 14, and flexible transfer line 15 passes through gear drive and connects both sides grip block 13.

In the specific use process, the lens 7 to be detected is placed above the clamping platform 12 by a worker, the first motor 14 is driven to drive the telescopic transmission rod 15 to rotate through controlling the control terminal 9, the clamping plates 13 on two sides are synchronously driven to move towards the middle, clamping of the lens 7 is achieved, distance data of position variation of the clamping plates 13 can be directly transmitted to the control terminal 9, the control terminal 9 drives the two groups of lifting cylinders 11 to synchronously change in height, when the outer side wall of the clamping plates 13 is level with the side wall of the clamping platform 12, the lifting cylinders 11 drive the clamping platform 12 to descend to the lowest height, when the distance between the inner side walls of the clamping plates 13 on two sides is minimum, the lifting cylinders 11 drive the clamping platform 12 to ascend to the highest height, the lens 7, the camera 8 and the collimator 6 are automatically kept on the same axis through adjustment, after adjustment is completed, the collimator 6 emits light beams, the light beams penetrate through the lens 7 and irradiate towards the direction of the camera 8, the sliding component 5 drives the camera 8 to reciprocate along the axis direction, the size and the brightness of the light point are continuously collected by the camera 8 in the moving process, the shot data and the position data are synchronously transmitted to the control terminal 9, and the position data of the moving are accurately displayed to the position of the control terminal 9, and the contrast data is accurately judged, and the contrast data is displayed by the worker.

The utility model makes the lens 7, the camera 8 and the collimator 6 form a whole through the working platform 1, and makes the camera 8 and the collimator 6 keep the same axis, the camera 8 is controlled to continuously change positions through the control terminal 9, projection size and brightness data at different positions are collected, the control terminal 9 carries out comparison judgment on the data, and further provides accurate focal length data for workers.

In this case, the slip subassembly 5 includes the sliding table 16 with mount 2 fixed connection, the equal fixed connection slide bar 17 in sliding table 16 both sides, the sliding block 18 is cup jointed in the sliding bar 17 slip, camera 8 is connected to sliding block 18 upper end level, the second motor 19 is connected to the one end that lens holder 4 was kept away from to sliding table 16, threaded rod 20 is connected to the coaxial heart of the output of second motor 19, threaded rod 20's the other end and sliding table 16 tip rotate to be connected, sliding block 18 and threaded rod 20 threaded connection drive threaded rod 20 through second motor 19 and carry out forward or reverse rotation, realize the position movement of sliding table 16 in different directions, and provide the restriction that the bulk movement was put to for sliding table 16 removes through sliding bar 17, further improved sliding table 16's stability, the wholeness of device has been improved.

In the scheme, the sliding groove 23 is formed in the clamping platform 12 corresponding to the clamping plate 13, the side wall of the clamping plate 13 is connected with the L-shaped racks 24, the end part of the telescopic transmission rod 15 penetrates through the clamping platform 12 and is connected with the rotating gear 25, the rotating gear 25 is in transmission connection with the L-shaped racks 24 on two sides, the first motor 14 is in transmission connection with the rotating gear 25 through the telescopic transmission rod 15, and further synchronous movement of the clamping platforms 12 on two sides is achieved, and the integrity of the device is improved.

In the scheme, the clamping plates 13 on the two sides corresponding to the clamping platform 12 are all connected with the distance scale plates 22, the side walls of the sliding table 16 are connected with the distance scale plates 22, and the staff can calibrate and observe the device through the fixed distance scale plates 22, so that the device is convenient to use and learn and record of the staff, and the practicability of the device is further improved.

In the scheme, the clamping pads 21 are all connected to the inner wall of the clamping plate 13, the concave structure is adopted in the cross section of the clamping pads 21, the stability of the clamping plate 13 for clamping the lens 7 is further improved, and the convenience of placing the lens 7 by workers is improved.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.

Claims (5)

1. The utility model provides a lens focal length measuring device, includes work platform (1), its characterized in that, work platform (1) upper wall connection mount (2), light pipe frame (3), lens holder (4), sliding component (5) are connected gradually to mount (2) upper end, light pipe frame (3) active end connection collimator (6), lens holder (4) active end detachable connection lens (7), camera (8) are connected to sliding component (5) active end, work platform (1) one end connection control terminal (9), control terminal (9) and sliding component (5), camera (8), collimator (6) all electric connection, and control terminal (9) and external power electric connection;

the lens holder (4) comprises a base (10) connected with a fixing frame (2), lifting cylinders (11) are symmetrically connected to the upper wall of the base (10), the output ends of the lifting cylinders (11) are connected with a clamping platform (12), clamping plates (13) are symmetrically and slidingly connected to the upper wall of the clamping platform (12), a first motor (14) is mounted in the base (10), an upward output end of the first motor (14) is coaxially connected with a telescopic transmission rod (15), and the telescopic transmission rod (15) is connected with the clamping plates (13) on two sides through gear transmission.

2. A device for measuring focal length of lens according to claim 1, characterized in that the sliding component (5) comprises a sliding table (16) fixedly connected with the fixing frame (2), two sides of the sliding table (16) are fixedly connected with sliding rods (17), the sliding rods (17) are in sliding sleeve connection with sliding blocks (18), the upper ends of the sliding blocks (18) are horizontally connected with the camera (8), one end, far away from the lens clamping piece (4), of the sliding table (16) is connected with a second motor (19), the output end of the second motor (19) is coaxially connected with a threaded rod (20), the other end of the threaded rod (20) is rotatably connected with the end part of the sliding table (16), and the sliding blocks (18) are in threaded connection with the threaded rod (20).

3. The device for measuring the focal length of the lens according to claim 2, wherein the clamping platform (12) is provided with a sliding groove (23) corresponding to the clamping plate (13), the side wall of the clamping plate (13) is connected with an L-shaped rack (24), the end part of the telescopic transmission rod (15) penetrates through the clamping platform (12) and is connected with a rotating gear (25), and the rotating gear (25) is in transmission connection with the L-shaped racks (24) at two sides.

4. A device for measuring focal length of a lens according to claim 3, wherein the clamping plates (13) on the two opposite sides of the clamping platform (12) are connected to the distance scale plate (22), and the side wall of the sliding table (16) is connected to the distance scale plate (22).

5. The device for measuring the focal length of a lens according to claim 4, wherein the inner walls of the clamping plates (13) are connected with clamping pads (21), and the cross section of each clamping pad (21) adopts a concave structure.