CN215766833U - Measuring tool with adjustable flange focal length - Google Patents
Measuring tool with adjustable flange focal length Download PDFInfo
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- CN215766833U CN215766833U CN202121939427.XU CN202121939427U CN215766833U CN 215766833 U CN215766833 U CN 215766833U CN 202121939427 U CN202121939427 U CN 202121939427U CN 215766833 U CN215766833 U CN 215766833U
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Abstract
The utility model provides a measuring tool with an adjustable flange focal length, which comprises a base and a sleeve; the sleeve is detachably sleeved on the base, and the connecting position between the sleeve and the base is adjustable; the top of the base is positioned in the sleeve and is provided with a horizontal reflector; the top of the sleeve is provided with a lens bearing piece, and the lens bearing piece is provided with a through hole opposite to the reflector; the distance between the plane of the upper surface of the lens bearing piece and the reflector is the flange focal length, and the size of the flange focal length is determined by the connecting position between the sleeve and the base. The utility model realizes the measurement of the flange focal length of different types of lenses, further solves the problem that the flange focal length of the existing flange focal length measuring tool is fixed, and a plurality of flange focal length measuring tools need to be designed to meet the calibration work of the target flange focal length of various lenses, reduces the calibration cost, and is convenient to operate without frequently replacing the measuring tool with adjustable flange focal length during the calibration work of different types of lenses.
Description
Technical Field
The utility model relates to the technical field of tools, in particular to a measuring tool with an adjustable flange focal length.
Background
Before an optical lens (hereinafter referred to as a lens for short) leaves a factory, a manufacturer needs to calibrate the flange focal length of the lens (the flange focal length is the distance from an installation flange to a convergence point of parallel light of an incident lens) by using a flange focal length measuring tool. The lens after being calibrated is qualified, namely the lens reaching the focal length of the target flange can meet the factory requirements. And the lens which is not qualified through calibration, namely the lens which does not reach the focal length of the target flange, needs to be returned to be trimmed until the calibration is qualified. The existing flange focal length measuring tool comprises a cylinder body, wherein a mirror surface bearing platform is arranged at the bottom of the cylinder body and used for bearing a plane reflector; the top of the cylinder is provided with a lens bearing piece opposite to the plane reflector and used for bearing and limiting the lens; the lens bearing piece comprises a solid part and a hollow area, and the hollow area is arranged opposite to the plane reflector and is used for realizing the imaging of the lens on the plane reflector; the solid part is arranged between the hollow area and the barrel, is connected with the barrel and is used for limiting the lens. The distance between the plane of the upper surface of the lens bearing piece and the plane reflector is the flange focal length of the flange focal length measuring tool. Because the mirror surface plummer, the lens among the present flange focal length measuring tool hold by piece and barrel structure as an organic whole, so its flange focal length that corresponds is fixed unchangeable.
When the lens is calibrated, a flange focal length measuring tool consistent with the target flange focal length of the test lens needs to be selected for calibration. The specific calibration process is as follows: firstly, lifting a light pipe of a BF (Brillouin field) measuring instrument to a proper height, and placing an existing flange focal length measuring tool right below the light pipe; secondly, positioning the lens assembled with the mounting flange through a lens bearing piece, aligning the lens with the plane reflector through the hollow area, and realizing imaging of the lens on the plane reflector through an optical principle; and finally, judging whether the focal length of the lens flange is qualified or not according to the definition of the imaging quality of the lens on the plane reflector. And if the imaging is clear, the calibration is qualified, namely the actual flange focal length of the lens is equal to the target flange focal length, and the factory requirements are met. If the imaging is not clear, namely the imaging quality is poor (for example, the image surface has diffuse speckles), the calibration is not qualified. At the moment, the focal length of the flange needs to be adjusted between the mounting flange and the lens in a mode of increasing or decreasing the gasket, and when the image is clear, the adjusted focal length of the flange reaches the target focal length of the flange; and measuring the thickness D of the added gasket by using a conventional length measuring tool, wherein the thickness D of the gasket is the difference between the actual flange focal length and the target flange focal length of the lens, and returning the unqualified lens to the factory for trimming according to the difference until the flange focal length is qualified for calibration, so that the factory-leaving requirement is met.
Because the lens that leaves the factory is of a great variety, and different lens of a kind have different target flange focal lengths. The distance between the lens bearing piece and the plane reflector is fixed in the existing flange focal length measuring tool, namely the flange focal length is fixed, so that the lens bearing piece can only be used for calibrating the target flange focal length of one lens, and the calibration of the target flange focal lengths of various lenses cannot be met. Therefore, in order to meet the factory calibration requirements of various lenses, a plurality of flange focal length measuring tools need to be arranged, the calibration cost is greatly increased, and the flange focal length measuring tools are replaced when different types of lenses are calibrated, so that the operation is complex, and the working efficiency is low.
In summary, there is a need for a measuring tool with adjustable flange focal length to solve the problems of high calibration cost, complex operation and low operation efficiency caused by the unadjustable flange focal length of the measuring tool in the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a measuring tool with an adjustable flange focal length, which has the following specific technical scheme:
a measuring tool with adjustable flange focal length comprises a base and a sleeve; the sleeve is detachably sleeved on the base, and the connecting position between the sleeve and the base is adjustable; the top of the base is positioned in the sleeve and is provided with a horizontal reflector; the top of the sleeve is provided with a lens bearing piece, and the lens bearing piece is provided with a through hole opposite to the reflector; the distance between the plane of the upper surface of the lens bearing piece and the reflector is the flange focal length, and the size of the flange focal length is determined by the connecting position between the sleeve and the base.
Preferably, the inner wall of the sleeve is provided with an internal thread, and the base is provided with an external thread matched with the sleeve.
Preferably, the pitch of the internal thread is 0.25-1mm, and the pitch of the external thread is 0.25-1 mm.
Preferably, the base comprises a boss and a bottom plate, and the boss is arranged on the bottom plate; the external thread is arranged on the boss; the sleeve is in threaded connection with the boss.
Preferably, the reflector is adhered to the top of the boss.
Preferably, the through hole is arranged opposite to the reflector.
Preferably, the mirror is a plane mirror.
The technical scheme of the utility model has the following beneficial effects:
according to the measuring tool with the adjustable flange focal length, the sleeve is detachably sleeved on the base, the connecting position between the sleeve and the base is adjustable, the size of the flange focal length is determined through the connecting position between the sleeve and the base, so that the measuring tool with the adjustable flange focal length can determine the required flange focal length by changing the connecting position between the sleeve and the base, the flange focal length measurement of different lenses is realized, the problems that the flange focal length of the existing flange focal length measuring tool is fixed, a plurality of flange focal length measuring tools need to be designed to meet the calibration work of target flange focal lengths of various lenses are solved, the calibration cost is reduced, and when the measuring tool with the adjustable flange focal length is used for calibrating different lenses, the measuring tool with the adjustable flange focal length does not need to be frequently replaced, the operation is convenient and the operation efficiency is improved.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:
fig. 1 is a schematic structural diagram of a measuring tool with an adjustable flange focal length according to embodiment 1 of the present invention;
the lens support comprises a base 1, a base 1.1, external threads 1.2, a boss 1.3, a bottom plate 2, a sleeve 2.1, internal threads 3, a reflector 4, a lens bearing piece 4.1 and a through hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
Example 1:
referring to fig. 1, a measuring tool with adjustable flange focal length comprises a base 1 and a sleeve 2; the sleeve 2 is detachably sleeved on the base 1, and the connection position between the sleeve and the base is adjustable; the top of the base 1 is positioned in the sleeve 2 and is provided with a horizontal reflector 3; a lens bearing part 4 is arranged at the top of the sleeve 2, and a through hole 4.1 opposite to the reflector 3 is arranged on the lens bearing part 4; the shortest distance between the plane of the upper surface of the lens bearing piece 4 and the reflector 3 is the flange focal length, and the size of the flange focal length is determined by the connecting position between the sleeve 2 and the base 1.
The inner wall of the sleeve 2 is provided with an internal thread 2.1, and the base 1 is provided with an external thread 1.1 matched with the sleeve 2. The internal and external screw thread of sleeve 2 and boss 1.2 is connected, the pitch of internal thread 2.1 is 0.5mm, the pitch of external screw thread 1.1 is 0.5mm, the size of the accurate regulation and control flange focus of being convenient for. If the tooth pitch is too large, the connection between the base 1 and the sleeve 2 is loosened, so that the accuracy of measured data is influenced; if the pitch is too small, the manufacturing cost of the base 1 and the sleeve 2 increases.
The base 1 comprises a boss 1.2 and a bottom plate 1.3, wherein the boss 1.2 is arranged on the bottom plate 1.3, and the boss and the bottom plate are of an integrally formed structure; the external thread 1.1 is arranged on the boss 1.2; the sleeve 2 is in threaded connection with the boss 1.2. The design of bottom plate 1.3 is convenient for provide outside stress point (promptly the operation personnel fixed bottom plate 1.3), guarantees to go on smoothly when sleeve 2 is connected and dismantles the operation with boss 1.2.
The reflector 3 is pasted (like magic tape) and arranged on the top of the boss 1.2, so that the installation is convenient.
The reflector 3 may also be mounted in another way, specifically: be equipped with the recess that is used for holding speculum 3 on boss 1.2's top, and set up in the both sides of recess and get the hand position, be convenient for get and put speculum 3.
The through hole 4.1 is arranged opposite to the reflector 3.
The reflector 3 is a plane reflector.
The measuring tool with the adjustable flange focal length is used for calibrating the lens in a specific using process as follows:
firstly, a light pipe of a BF (BF) measuring instrument is lifted to a proper height (the height range is 190-250mm, the height of the embodiment 1 is 200mm), and the measuring tool with the adjustable flange focal length is arranged right below the light pipe;
secondly, positioning the lens assembled with the mounting flange through a lens bearing piece, aligning the lens with the plane reflector through a through hole 4.1, and realizing imaging of the lens on the plane reflector through an optical principle;
and finally, judging whether the focal length of the lens flange is qualified or not according to the definition of the imaging quality of the lens on the plane reflector. And if the imaging is clear, the calibration is qualified, namely the actual flange focal length of the lens is equal to the flange focal length of the measuring tool with the adjustable flange focal length, the preset target flange focal length M value of the lens is reached, and the factory requirements are met. If the imaging is not clear, namely the imaging quality is poor (for example, the image surface has diffuse speckles), the calibration is not qualified. At the moment, the flange focal length of the measuring tool with the adjustable flange focal length is adjusted, namely the flange focal length is adjusted by rotating the sleeve 2 to change the connecting position between the sleeve 2 and the base 1, and when the image is clear, the adjusted flange focal length reaches the actual flange focal length of the lens; and measuring the flange focal length S value of the measuring tool with the adjustable flange focal length by using a conventional length measuring tool, wherein the S value is the actual flange focal length of the lens, and returning the unqualified lens to the factory for trimming according to the difference value between the S value and the M value until the flange focal length is qualified for calibration, thereby meeting the factory requirements.
In this embodiment 1 flange focus adjustable measuring tool, sleeve 2 can be dismantled the cover and establish on base 1, and the hookup location between the two is adjustable, the size of flange focus is confirmed through the hookup location between sleeve 2 and base 1, makes flange focus adjustable measuring tool can confirm required flange focus through the hookup location who changes sleeve 2 and base 1, has realized measuring the flange focus of different kind of camera lenses, and then it is fixed to have solved current flange focus measuring tool's flange focus, needs to design the problem that a plurality of flange focus measuring tools satisfy the calibration work of the target flange focus of multiple camera lenses, has reduced calibration cost, and when the calibration operation to different kind of camera lenses, need not frequently change flange focus adjustable measuring tool, and the simple operation has improved the operating efficiency.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The measuring tool with the adjustable flange focal length is characterized by comprising a base (1) and a sleeve (2); the sleeve (2) is detachably sleeved on the base (1), and the connecting position between the sleeve and the base is adjustable; the top of the base (1) is positioned in the sleeve (2) and is provided with a horizontal reflector (3); a lens bearing piece (4) is arranged at the top of the sleeve (2), and a through hole (4.1) opposite to the reflector (3) is formed in the lens bearing piece (4); the distance between the plane of the upper surface of the lens bearing piece (4) and the reflector (3) is the flange focal length, and the size of the flange focal length is determined by the connecting position between the sleeve (2) and the base (1).
2. The measuring tool with the adjustable flange focal length according to claim 1, characterized in that an internal thread (2.1) is provided on the inner wall of the sleeve (2), and an external thread (1.1) adapted to the sleeve (2) is provided on the base (1).
3. The flange focus adjustable measuring tool according to claim 2, characterized in that the pitch of the internal thread (2.1) is 0.25-1mm and the pitch of the external thread (1.1) is 0.25-1 mm.
4. The flange focus adjustable measuring tool according to claim 3, characterized in that the base (1) comprises a boss (1.2) and a bottom plate (1.3), the boss (1.2) is arranged on the bottom plate (1.3); the external thread (1.1) is arranged on the boss (1.2); the sleeve (2) is in threaded connection with the boss (1.2).
5. The flange focal length adjustable measuring tool according to claim 4, characterized in that the reflector (3) is adhesively arranged on the top of the boss (1.2).
6. The flange focus adjustable measuring tool according to any one of claims 1-5, characterized in that the through hole (4.1) is arranged opposite to the reflector (3).
7. The flange focus adjustable measuring tool according to claim 6, characterized in that the reflector (3) is a plane reflector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121939427.XU CN215766833U (en) | 2021-08-18 | 2021-08-18 | Measuring tool with adjustable flange focal length |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121939427.XU CN215766833U (en) | 2021-08-18 | 2021-08-18 | Measuring tool with adjustable flange focal length |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215766833U true CN215766833U (en) | 2022-02-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121939427.XU Active CN215766833U (en) | 2021-08-18 | 2021-08-18 | Measuring tool with adjustable flange focal length |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215766833U (en) |
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2021
- 2021-08-18 CN CN202121939427.XU patent/CN215766833U/en active Active
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