High-coaxiality adjustable optical path module and optical measuring instrument
By adopting threaded fitting and guide surface design in optical measuring instruments, the optical axis offset problem of the movable lens unit is solved, a high-precision and easily adjustable optical path module is realized, and the adjustment accuracy and stability of the optical measuring instrument are improved.
Patent Information
- Application Number
- CN202423061246.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-12-11
AI Technical Summary
In existing optical measuring instruments, the threaded connection and sliding connection of the movable lens unit are difficult to meet the requirements of high precision and easy adjustability at the same time, resulting in the problem of optical axis offset.
The first threaded surface and the second threaded surface of the threaded body are combined with the first guide surface and the second guide surface to limit the optical axis deviation during adjustment of the movable lens unit. The axial position is adjusted by rotating the lens barrel, and the guiding effect of the guide surface is utilized to improve the adjustment accuracy and ease of adjustment.
The adjustment accuracy and adjustability of the movable lens unit are improved, the processing requirements are reduced, the optical axis offset is reduced, and the demand for high coaxiality optical path modules is met.
Smart Images
Figure CN223401088U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of optical measurement equipment, and in particular to a high-coaxiality adjustable optical path module and an optical measurement instrument. Background Art
[0002] In precision optical measuring instruments such as imagers, white light interferometers, and confocal microscopes, the optical path module usually includes multiple lens units. These lens units can be divided into fixed lens units and movable lens units based on whether they can be adjusted. By adjusting the movable lens units, functions such as zoom and compensation can be achieved.
[0003] The lenses of a movable lens unit are typically mounted in a lens barrel. The lens barrels of adjacent movable lens units are connected by threaded or sliding connections, allowing the relative positions of the adjacent lens barrels to be adjusted to change the distance between the lenses of the movable lens units. However, both connection methods have limitations. For example, due to processing accuracy, threaded connections may cause optical axis offset during rotational adjustment, while sliding connections require a large gap to ensure smooth movement, which can easily cause optical axis offset. This makes it difficult to simultaneously meet the requirements of high precision and easy adjustability. Utility Model Content
[0004] In order to improve the shortcomings of the movable lens unit in terms of adjustment accuracy and adjustability, the present application provides a high coaxiality adjustable light path module and an optical measuring instrument.
[0005] According to the first aspect, an embodiment provides a high-coaxiality adjustable optical path module, comprising:
[0006] A mounting body, wherein the mounting body has at least one mounting cavity;
[0007] A movable lens unit, comprising a lens barrel and a lens, wherein the lens barrel is disposed in the mounting cavity, the lens barrel having a hollow inner cavity, and the lens is disposed in the hollow inner cavity;
[0008] The cavity wall of the installation cavity includes a first guide surface and a first threaded surface arranged along the axial direction of the installation cavity, and the outer wall of the lens barrel includes a second guide surface and a second threaded surface arranged along the axial direction of the lens barrel;
[0009] When the movable lens unit is installed in the installation cavity, the first threaded surface and the second threaded surface are threadedly matched, and the first guide surface and the second guide surface match, so as to limit the degree of optical axis deviation when the movable lens unit is adjusted.
[0010] In one embodiment, a maximum radial gap between the first guide surface and the second guide surface is no more than 5 microns, and the first guide surface and the second guide surface are in a sliding fit.
[0011] In one embodiment, the dimensional tolerance of the first guide surface and / or the second guide surface is no more than ±1 micron.
[0012] In one embodiment, at least one end of the lens barrel is provided with a first torque transmission structure along the axial direction of the lens barrel for rotating the lens barrel.
[0013] In one embodiment, the mounting body is provided with an adjustment channel on one side of the mounting cavity, and the adjustable optical path module further includes a detachable cover provided corresponding to the adjustment channel. After the cover is removed, the adjustment channel connects the mounting cavity with the outside of the mounting body, so that the end of the lens barrel provided with the first torque transmission structure is exposed to the outside of the mounting body.
[0014] In one embodiment, the adjustable optical path module further includes a top screw provided on a side wall of the mounting cavity, and the top screw is used to fix the lens barrel.
[0015] In one embodiment, the cavity wall of the hollow inner cavity has a step surface, a fixing member is provided in the hollow inner cavity, and the lens is clamped between the step surface and the fixing member.
[0016] In one embodiment, the fixing member is threadedly assembled in the hollow inner cavity, and a second torque transmission structure is provided at one end of the fixing member away from the step surface for rotating the fixing member.
[0017] In one embodiment, the mounting body includes at least a first body part and a second body part, the movable lens unit is provided on both the first body part and the second body part, and the first body part and the second body part are cooperatively provided with a positioning structure for positioning and a fixing structure for fixing.
[0018] According to a second aspect, an embodiment provides an optical measuring instrument, comprising:
[0019] Instrument body;
[0020] And the high-coaxiality adjustable optical path module described in any of the above embodiments, wherein the adjustable optical path module is arranged on the instrument body.
[0021] According to the high-coaxiality adjustable optical path module of the above embodiment, a threaded connection between the movable lens unit and the mounting body is achieved by providing a first threaded surface and a second threaded surface that are threadedly matched, so that the axial position of the movable lens unit can be adjusted by rotating the lens barrel as needed. In addition, by providing a first guide surface and a second guide surface that are matched, a guiding role is played when the movable lens unit is adjusted to limit the degree of optical axis deviation when the movable lens unit is adjusted, which helps to improve the adjustment accuracy and adjustability of the movable lens unit and also helps to reduce the processing requirements for the first threaded surface and the second threaded surface. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 Schematic diagram of the cross-sectional structure of a high coaxiality adjustable optical path module according to an embodiment;
[0023] Figure 2 is a structural schematic diagram of a movable lens unit according to an embodiment;
[0024] Figure 3 1 is a schematic cross-sectional structural diagram of a movable lens unit according to an embodiment;
[0025] Figure 4 is a schematic cross-sectional structural diagram of an installation body according to an embodiment;
[0026] Figure 5 This is a structural schematic diagram of an adjustable optical path module in an embodiment with its cover removed;
[0027] Figure 6 FIG1 is a structural diagram of an adjustable optical path module in a cover-mounted state according to an embodiment.
[0028] In the figure, 100, mounting body; 1001, first main body portion; 1002, second main body portion; 110, mounting cavity; 111, first cavity; 1111, first guide surface; 112, second cavity; 1121, first threaded surface; 120, adjustment channel; 121, cover; 131, threaded through hole;
[0029] 200, movable lens unit; 210, lens barrel; 211, hollow inner cavity; 212, stepped surface; 213, first portion; 2131, second guide surface; 214, second portion; 2141, second threaded surface; 215, first torque transmission structure; 220, lens; 230, fixing member; 231, second torque transmission structure;
[0030] 300. Fixed lens unit. DETAILED DESCRIPTION
[0031] The present application is further described in detail below by means of specific embodiments in conjunction with the accompanying drawings. Similar elements in different embodiments are numbered with associated similar elements. In the following embodiments, many detailed descriptions are provided to enable the present application to be better understood. However, those skilled in the art will readily appreciate that some of the features may be omitted in different circumstances, or may be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification. This is to avoid the core portion of the present application being overwhelmed by excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail. They can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.
[0032] In addition, the features, operations, or characteristics described in the specification may be combined in any appropriate manner to form various embodiments. Furthermore, the steps or actions in the method description may be reordered or adjusted in a manner readily apparent to those skilled in the art. Therefore, the various sequences in the specification and drawings are provided solely for the purpose of clearly describing a particular embodiment and are not intended to be mandatory, unless otherwise specified.
[0033] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings).
[0034] In an embodiment of the present application, the movable lens unit 200 is installed on the mounting body 100, and a first guide surface 1111 and a first threaded surface 1121 are provided on the cavity wall of the mounting cavity 110, and a second guide surface 2131 and a second threaded surface 2141 are provided on the lens barrel 210. When the axial position of the movable lens unit 200 is adjusted by rotating the lens barrel 210, the first guide surface 1111 and the second guide surface 2131 are used for matching guidance to compensate for insufficient processing accuracy of the first threaded surface 1121 and the second threaded surface 2141, thereby limiting the degree of optical axis deviation during adjustment of the movable lens unit 200, and helping to improve the adjustment accuracy and adjustability of the movable lens unit 200.
[0035] Embodiments of the high coaxiality adjustable optical path module in this application:
[0036] In one embodiment, please refer to Figures 1-6 The high coaxiality adjustable optical path module includes a mounting body 100 and a movable lens unit 200.
[0037] Please refer to Figure 1The mounting body 100 can be understood as the mounting base for the movable lens unit 200. The mounting body 100 has at least one mounting cavity 110 for mounting the movable lens unit 200. The mounting body 100 constitutes the main form and external contour of the adjustable optical path module, and the adjustable optical path module can be moved, installed, and used through the mounting body 100.
[0038] For example, please refer to Figure 1 The mounting body 100 is provided with four mounting cavities 110 as required. In other embodiments, the number of mounting cavities 110 may be one, two, three, five, or more, as long as they meet the design and use requirements. In addition, the mounting body 100 may also be provided with one or more fixed lens units.
[0039] The movable lens unit 200 can be understood as a collection of lens 220 and related accessories. After being assembled on the mounting body 100, the movable lens unit 200 can be adjusted in position as needed to meet the needs of functions such as zooming, compensation, etc. In one embodiment, please refer to Figure 2 and Figure 3 The movable lens unit 200 includes a lens barrel 210 and a lens 220. The lens barrel 210 is disposed in the mounting cavity 110. The lens barrel 210 has a hollow inner cavity 211, and the lens 220 is disposed in the hollow inner cavity 211. It will be appreciated by those skilled in the art that the lens 220 can be fixed in the hollow inner cavity 211 in any manner, including snap-fitting, bonding, or other fixing methods.
[0040] In one embodiment, please refer to Figure 3 The cavity wall of the hollow inner cavity 211 has a stepped surface 212. A fixing member 230 is provided in the hollow inner cavity 211, and the lens 220 is sandwiched between the stepped surface 212 and the fixing member 230. For example, the fixing member 230 can be a fixing ring threadedly assembled into the hollow inner cavity 211. After the lens 220 is installed in the hollow inner cavity 211, the fixing ring is installed to sandwich the lens 220 between the stepped surface 212 and the fixing ring. By adjusting the position of the fixing ring, the clamping force of the lens 220 can be adjusted. In other embodiments, the fixing member 230 can also adopt other shapes or structures that meet design and usage requirements.
[0041] In order to facilitate the adjustment of the position of the fixing member 230 threadedly assembled in the hollow inner cavity 211, in a further embodiment, please refer to Figure 2 and Figure 3A second torque transmission structure 231 is provided at the end of the fixing member 230 that is away from the stepped surface 212, for rotating the fixing member 230. Those skilled in the art will appreciate that the second torque transmission structure 231 can be provided in any form or quantity. For example, it can be provided in the form of one or more slots, protrusions, or other structures that facilitate the rotation of the lens barrel 210. Exemplarily, the second torque transmission structure 231 is a slot provided at the end of the fixing member 230 that is away from the stepped surface 212. The slot is adapted to accommodate a tool inserted therein to rotate the fixing member 230.
[0042] In order to minimize the optical axis deviation of the movable lens unit 200 during axial adjustment, in one embodiment, please refer to Figure 1 、 Figure 3 and Figure 4 The cavity wall of the mounting cavity 110 includes a first guide surface 1111 and a first threaded surface 1121 arranged along the axial direction of the mounting cavity 110, and the outer wall of the lens barrel 210 includes a second guide surface 2131 and a second threaded surface 2141 arranged along the axial direction of the lens barrel 210; when the movable lens unit 200 is installed in the mounting cavity 110, the first threaded surface 1121 and the second threaded surface 2141 are threadedly engaged, and the first guide surface 1111 and the second guide surface 2131 match, so that the first guide surface 1111 and the second guide surface 2131 play a guiding role when the movable lens unit 200 is adjusted, so as to limit the degree of optical axis deviation when the movable lens unit 200 is adjusted.
[0043] Those skilled in the art will appreciate that matching of the first guide surface 1111 and the second guide surface 2131 can be understood as meaning that the maximum radial gap between the first guide surface 1111 and the second guide surface 2131 is no greater than a predetermined size, thereby ensuring guidance for adjustment of the movable lens unit 200. In one embodiment, the maximum radial gap between the first guide surface 1111 and the second guide surface 2131 can be set to no greater than 5 microns, with the first and second guide surfaces being in a sliding fit. In other embodiments, the maximum radial gap between the first guide surface 1111 and the second guide surface 2131 can be set to 2 microns, 5 microns, or other values, as long as it meets design and usage requirements.
[0044] Those skilled in the art will appreciate that the machining accuracy of the first guide surface 1111 and the second guide surface 2131 can affect the guiding effect. Therefore, in some embodiments, the machining accuracy of the first guide surface 1111 and the second guide surface 2131 can be controlled to the micron level. For example, the dimensional tolerance of the first guide surface 1111 and / or the second guide surface 2131 is no greater than ±1 micron. For example, the roughness of the first guide surface 1111 and / or the second guide surface 2131 can be no greater than 3.2 microns, and can be, for example, 1.6 microns, 0.8 microns, 0.4 microns, 0.2 microns, etc.
[0045] For example, please refer to Figure 3 The lens barrel 210 has a first portion 213 and a second portion 214 along its axial direction. The outer diameter of the first portion 213 is larger than that of the second portion 214, resulting in a segmented outer profile of the lens barrel 210. The outer surface of the first portion 213 is a circular arc surface with a dimensional tolerance of no more than ±1 micron, serving as a second guide surface 2131. The outer surface of the second portion 214 is threaded to form a second threaded surface 2141.
[0046] Please refer to Figure 4 The mounting cavity 110 is shaped to match the lens barrel 210 and includes a first cavity 111 for accommodating the first portion 213 and a second cavity 112 for accommodating the second portion 214. The inner diameter of the wall of the first cavity 111 is larger than the inner diameter of the wall of the second cavity 112. The wall of the second cavity 112 is threaded (not shown) to form a first threaded surface 1121. The threads of the first threaded surface 1121 and the second threaded surface 2141 mate to enable axial movement of the lens barrel 210 when the lens barrel 210 is rotated. The wall of the first cavity 111 is a circular arc surface with a dimensional tolerance of no more than ±1 micron, serving as a first guide surface 1111. The difference between the inner diameter of the wall of the first cavity 111 and the outer diameter of the outer surface of the first portion 213 is no more than 4 microns. This limits the radial deviation of the lens barrel 210 during axial movement, thereby limiting the degree of optical axis deviation during adjustment of the movable lens unit 200.
[0047] In order to facilitate the adjustment of the movable lens unit 200, in one embodiment, please refer to Figure 2 and Figure 3 At least one end of the lens barrel 210 is provided with a first torque transmission structure 215 along the axial direction of the lens barrel 210 for rotating the lens barrel 210. Those skilled in the art will appreciate that the arrangement form and number of the first torque transmission structure 215 are not limited, and can meet the design and use requirements. For example, the first torque transmission structure 215 can be provided as a slot with reference to the second torque transmission structure 231. The slot is provided at an end of the first portion 213 away from the second portion 214. The slot can be inserted with a tool, so that even when the movable lens unit 200 is installed inside the installation body 100, the tool can be inserted into the slot to rotate the movable lens unit 200.
[0048] In order to facilitate the adjustment of the movable lens unit 200 disposed inside the installation body 100, in one embodiment, please refer to Figure 5 and Figure 6The mounting body 100 is provided with an adjustment channel 120 on one side of the mounting cavity 110, and the adjustable optical path module further includes a detachable cover 121 provided corresponding to the adjustment channel 120. After the cover 121 is removed, the adjustment channel 120 connects the mounting cavity 110 with the outside of the mounting body 100, so that one end of the lens barrel 210 provided with the first torque transmission structure 215 is exposed to the outside of the mounting body 100.
[0049] For example, an adjustment channel 120 can be provided on the installation body 100 corresponding to part or all of the installation cavity 110, so that the adjustment channel 120 is connected to the first cavity 111 of the installation cavity 110, and the first torque transmission structure 215 can be exposed to the outside of the installation body 100 through the adjustment channel 120. The cover 121 can be installed on the end of the adjustment channel 120 away from the installation cavity 110 by screws or other detachable means, so as to close the adjustment channel 120 when there is no need to adjust the movable lens unit 200, thereby reducing the risk of contamination and damage to the movable lens unit 200.
[0050] In a further embodiment, please refer to Figure 5 and Figure 6 The adjustable optical path module further includes a top screw (not shown) disposed on the side wall of the mounting cavity 110. The top screw is used to secure the lens barrel 210 to ensure that the lens barrel 210 remains in a fixed position during movement and use of the adjustable optical path module, thereby enhancing the vibration resistance of the adjustable optical path module. For example, a threaded through hole 130 is provided on the side wall of the first cavity 111. The top screw is threadedly assembled in the threaded through hole 130. The end of the top screw extending into the first cavity 111 can be adjusted to abut against the lens barrel 210 to secure the position of the lens barrel 210.
[0051] Those skilled in the art will appreciate that, for some adjustable optical path modules having multiple groups of movable lens units 200 , the mounting body 100 may be formed by assembling multiple parts so as to install the movable lens unit 200 into each mounting cavity 110 .
[0052] In one embodiment, please refer to Figure 1 The installation body 100 includes at least a first body part 1001 and a second body part 1002. The first body part 1001 and the second body part 1002 are both provided with an active lens unit 200. The first body part 1001 and the second body part 1002 are cooperatively provided with a positioning structure for positioning and a fixing structure for fixing.
[0053] For example, the positioning structure can be a positioning slot provided on the first main body portion 1001, and the second main body portion 1002 can have a corresponding positioning end that can be inserted into the positioning slot, and the positioning slot and the positioning end cooperate to achieve positioning. The fixing structure can be a threaded structure provided in the positioning slot and the positioning end to thread the second column portion to the first main body portion, or it can be a bolt and screw hole, or other structure that meets the fixing requirements. In short, the positioning structure and the fixing structure can be arranged in any form, and can achieve both positioning and fixing between the first main body portion 1001 and the second main body portion 1002.
[0054] Examples of optical measuring instruments in this application:
[0055] In one embodiment, the optical measuring instrument includes an instrument body and the high-coaxiality adjustable optical path module according to any one of the above embodiments, and the high-coaxiality adjustable optical path module is arranged on the instrument body.
[0056] In one embodiment, the instrument body may include a base, a motion platform, and a probe. The motion platform is mounted on the base and can be used to move the sample. The probe is mounted on one side of the base, and the optical module is disposed within the probe to enable observation and detection of the sample placed on the motion platform.
[0057] The above specific examples are used to illustrate the present application, which is only used to help understand the present application and is not intended to limit the present application. For those skilled in the art of the present application, based on the concept of the present application, they can also make some simple deductions, modifications or substitutions.
Claims
1. High coaxiality adjustable optical path module, characterized by: include: a mounting body, wherein the mounting body has at least one mounting cavity; A movable lens unit, comprising a lens barrel and a lens, wherein the lens barrel is disposed in the mounting cavity, the lens barrel having a hollow inner cavity, and the lens is disposed in the hollow inner cavity; The cavity wall of the installation cavity includes a first guide surface and a first threaded surface arranged along the axial direction of the installation cavity, and the outer wall of the lens barrel includes a second guide surface and a second threaded surface arranged along the axial direction of the lens barrel; When the movable lens unit is installed in the installation cavity, the first threaded surface and the second threaded surface are threadedly matched, and the first guide surface and the second guide surface match, so as to limit the degree of optical axis deviation when the movable lens unit is adjusted.
2. The adjustable optical path module according to claim 1, wherein: The maximum radial gap between the first guide surface and the second guide surface is no more than 5 microns, and the first guide surface and the second guide surface are in a sliding fit.
3. The adjustable optical path module according to claim 1, wherein: The dimensional tolerance of the first guide surface and / or the second guide surface is no more than ±1 micron.
4. The adjustable optical path module according to any one of claims 1 to 3, wherein: At least one end of the lens barrel is provided with a first torque transmission structure along the axial direction of the lens barrel for rotating the lens barrel.
5. The adjustable optical path module according to claim 4, wherein: The mounting body is provided with an adjustment channel on one side of the mounting cavity, and the adjustable optical path module further includes a detachable cover provided corresponding to the adjustment channel. After the cover is removed, the adjustment channel connects the mounting cavity with the outside of the mounting body, so that the end of the lens barrel provided with the first torque transmission structure is exposed to the outside of the mounting body.
6. The adjustable optical path module according to claim 5, wherein: The adjustable optical path module further includes a top screw provided on a side wall of the mounting cavity, and the top screw is used to fix the lens barrel.
7. The adjustable optical path module according to any one of claims 1 to 3, characterized in that: The cavity wall of the hollow inner cavity has a step surface, a fixing piece is provided in the hollow inner cavity, and the lens is clamped between the step surface and the fixing piece.
8. The adjustable optical path module according to claim 7, wherein: The fixing member is threadedly assembled in the hollow inner cavity, and a second torque transmission structure is provided at one end of the fixing member away from the step surface for rotating the fixing member.
9. The adjustable optical path module according to any one of claims 1 to 3, characterized in that: The mounting body includes at least a first body part and a second body part, the movable lens unit is provided on the first body part and the second body part, and the first body part and the second body part are cooperatively provided with a positioning structure for positioning and a fixing structure for fixing.
10. An optical measuring instrument, characterized in that include: Instrument body; And the high-coaxiality adjustable optical path module according to any one of claims 1 to 9, wherein the adjustable optical path module is arranged on the instrument body.