CN112880982B - Precision machining method and system for large-caliber optical lens - Google Patents
Precision machining method and system for large-caliber optical lens Download PDFInfo
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- CN112880982B CN112880982B CN202110171503.5A CN202110171503A CN112880982B CN 112880982 B CN112880982 B CN 112880982B CN 202110171503 A CN202110171503 A CN 202110171503A CN 112880982 B CN112880982 B CN 112880982B
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- 238000003754 machining Methods 0.000 title claims abstract description 52
- 230000003287 optical effect Effects 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000001514 detection method Methods 0.000 claims abstract description 55
- 230000005499 meniscus Effects 0.000 claims abstract description 39
- 238000010276 construction Methods 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000013589 supplement Substances 0.000 abstract 1
- 238000012545 processing Methods 0.000 description 11
- 238000007689 inspection Methods 0.000 description 6
- 238000011161 development Methods 0.000 description 5
- 230000018109 developmental process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000003672 processing method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 230000002301 combined effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0207—Details of measuring devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
Abstract
The invention discloses a precision machining method and a precision machining system for a large-caliber optical lens, wherein the method comprises the following steps: acquiring a first convex surface and a back end surface of a biconvex lens to be processed; the first convex surface is configured as a meniscus lens or a plano-convex lens prior to finishing; finish machining is carried out on the meniscus lens or the plano-convex lens based on zero compensation detection of the large-caliber convex lens; before the second convex surface finish machining, constructing a biconcave lens or a plano-concave lens required by detection, so that the curvature radius of the two surfaces is coupled with the parameters of the two surfaces of the biconvex lens to be detected; the zero compensation detection characteristic of the large-caliber convex lens is utilized, a biconcave lens or a plano-concave lens is placed between the first convex surface of the biconvex lens to be detected and the compensator component to serve as a relay lens, and the combination effect of the plano-convex or meniscus lens is achieved; and (5) finishing the second convex surface to finish the precision machining. The method can realize the finish machining of the large-caliber biconvex lens and supplement the short plate in the current machining technology of the type of lens.
Description
Technical Field
The invention relates to the technical field of optical precision machining and inspection, in particular to a precision machining method and system for a large-caliber optical lens.
Background
As shown in fig. 1, the large-caliber optical lenses are classified according to their surface forms, and can be classified into aspherical lenses and spherical lenses; the classification is performed according to the form of the radius of curvature of both surfaces, and can be classified into a biconvex lens, a plano-convex lens, a meniscus lens, a biconcave lens, and a parallel plate.
Current developments in optical processing technology and equipment have been able to meet the processing requirements of meter-scale mirrors, including surface shaping, surface polishing and surface shape error finishing, all supported by well-established processing technologies and equipment. However, the processing of convex surfaces, particularly large-caliber convex surfaces, is a difficulty due to the capabilities of the inspection technology and inspection equipment.
The principle of optical interference is applied to accurately detect the surface shape error of the optical surface. The standard lens of the interferometer can be used for detecting the surface shape errors of the plane and the sphere. The detectable caliber of the concave spherical surface is not limited by the size of the window lens of the interferometer, but for the convex spherical surface, the size of the window lens and the focal length of the lens of the interferometer can become key factors for limiting detection, and the spherical surface exceeding the range can not realize the surface shape error detection of the full caliber.
The conventional control template detection method can only obtain the numerical value of the local aperture because of not having a large enough template, and the processing detection precision of the conventional processing method cannot directly meet the high-precision requirement.
The non-contact contour testing equipment can be used for conveniently and simultaneously obtaining the contour parameters and the face errors of the optical element, but the equipment is high in price, the detectable caliber is limited by the specification of the equipment, and the systematic error of testing the element with larger caliber is relatively high.
As shown in fig. 2, for accurate detection of a large-caliber convex spherical surface, zhao Wencai et al propose to adopt a zero compensation method, so that light passing through a compensation device is incident to the convex spherical surface (corresponding to a concave spherical surface in this case) from a back plane or a concave surface of the convex spherical surface and is subjected to auto-collimation reflection, thereby realizing detection of the convex surface. However, the method can only be used for detecting the convex surface of the plano-convex lens or the meniscus lens, and cannot realize the accurate detection and processing of the biconvex lens.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent.
Therefore, an object of the present invention is to provide a precision machining method of a large-caliber optical lens, which realizes precise detection and machining of a large-caliber lenticular lens.
Another object of the present invention is to provide a precision machining system for large-aperture optical lenses.
In order to achieve the above object, an embodiment of the present invention provides a precision machining method for a large-caliber optical lens, including the following steps: step S1, obtaining a first convex surface and a back end surface of a biconvex lens to be processed; s2, before finishing the first convex surface, constructing the back end surface of the first convex surface into a concave spherical surface or a plane to obtain a meniscus lens or a plano-convex lens; s3, carrying out finish machining on the convex surface of the meniscus lens or the plano-convex lens based on a zero compensation detection method of the large-caliber convex lens; s4, obtaining a second convex surface of the biconvex lens to be processed; step S5, before finishing the second convex surface, constructing a biconcave or plano-concave lens required for detection, and combining the biconcave or plano-concave lens with the first convex surface to obtain a combination of an approximate meniscus lens or plano-convex lens, wherein the constructed biconcave or plano-concave lens is called a relay lens; and S6, finishing the convex surface of the combination body of the approximately meniscus lens or the plano-convex lens by using a zero compensation detection method of the large-caliber convex lens, and finishing the precision machining of the biconvex lens to be machined.
The precise processing method of the large-caliber optical lens solves the problem of difficult processing of the large-caliber optical lens, is suitable for processing of the large-caliber spherical lens and the aspheric lens, meets application requirements of precise optical lens design, development of an ultrahigh resolution imaging system and the like, provides an effective precise detection method from the optical detection principle, and ensures smooth development of processing of optical components.
In addition, the precision machining method of the large-caliber optical lens according to the above embodiment of the invention may further have the following additional technical features:
further, in one embodiment of the present invention, the first convex surface is a positive portion of the lenticular lens to be processed, and the second convex surface is a back portion of the lenticular lens to be processed.
Further, in one embodiment of the present invention, when the plano-convex lens is configured, the aperture of the plane of the plano-convex lens needs to satisfy the detection condition of the preset detection device, and if not, the plano-convex lens is configured as the meniscus lens.
Further, in one embodiment of the present invention, the relay lens is used to modulate the test beam to compensate for excessive deflection of light by the front convex surface of the lenticular lens to be detected.
Further, in one embodiment of the present invention, the combination of the relay lens and the lenticular lens to be detected is regarded as a meniscus lens or a plano-convex lens.
In order to achieve the above object, another embodiment of the present invention provides a precision machining system for a large-caliber optical lens, comprising: the first acquisition module is used for acquiring the first convex surface and the back end surface of the biconvex lens to be processed; the first construction module is used for constructing the back end face of the first convex surface into a concave spherical surface or a plane before finishing the first convex surface to obtain a meniscus lens or a plano-convex lens; the first finishing module is used for finishing the convex surface of the meniscus lens or the plano-convex lens based on a zero compensation detection method of the large-caliber convex lens; the second acquisition module is used for acquiring a second convex surface of the biconvex lens to be processed; the second construction module is used for constructing a biconcave or plano-concave lens required for detection before finishing the second convex surface and combining the biconcave or plano-concave lens with the first convex surface to obtain a combination of an approximate meniscus lens or plano-convex lens, and the constructed biconcave or plano-concave lens is called a relay lens; and the second finishing module is used for finishing the convex surface of the combination body of the approximately meniscus lens or the plano-convex lens by using a zero compensation detection method of the large-caliber convex lens so as to finish the precision machining of the biconvex lens to be machined. The precision machining system for the large-caliber optical lens solves the problem of difficult machining of the large-caliber optical lens, is suitable for machining of the large-caliber spherical lens and the aspheric lens, meets application requirements of precision optical lens design, development of an ultrahigh resolution imaging system and the like, provides an effective precision detection method from the optical detection principle, and ensures smooth development of machining of optical components.
In addition, the precision machining system for a large-caliber optical lens according to the above embodiment of the invention may further have the following additional technical features:
further, in one embodiment of the present invention, the first convex surface is a positive portion of the lenticular lens to be processed, and the second convex surface is a back portion of the lenticular lens to be processed.
Further, in one embodiment of the present invention, when the plano-convex lens is configured, the aperture of the plane of the plano-convex lens needs to satisfy the detection condition of the preset detection device, and if not, the plano-convex lens is configured as the meniscus lens.
Further, in one embodiment of the present invention, the relay lens is used to modulate the test beam to compensate for excessive deflection of light by the front convex surface of the lenticular lens to be detected.
Further, in one embodiment of the present invention, the combination of the relay lens and the lenticular lens to be detected is regarded as a meniscus lens or a plano-convex lens.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic view of various types of lenses;
FIG. 2 is a schematic diagram of zero compensation detection convex sphere;
FIG. 3 is a flow chart of a method of precision machining a large aperture optical lens according to one embodiment of the invention;
FIG. 4 is a schematic view showing the combined effect of a relay lens and a lenticular lens to be inspected according to an embodiment of the present invention, wherein (a) is a schematic view of inspecting a second convex surface using the relay lens, and (b) is a schematic view of inspecting a first convex surface using the relay lens;
FIG. 5 is a schematic diagram of the detection of a constructed relay lens according to one embodiment of the invention;
fig. 6 is a flowchart of a lenticular lens processing method according to an embodiment of the present invention;
fig. 7 is a schematic diagram showing the structure of a precision machining system for a large-aperture optical lens according to an embodiment of the present invention.
Reference numerals illustrate: 1-biconvex lens, 2-plano-convex lens, 3-meniscus lens, 4-parallel flat plate, 5-plano-concave lens, 6-biconcave lens, 7-detection optical path focal point, 8-zero compensator component, 9-relay lens, 10-relay lens A 'face, 11-relay lens B' face, 12-biconvex lens A 'face to be detected, and 13-biconvex lens B' face to be detected.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The following describes a precision machining method and system for a large-caliber optical lens according to an embodiment of the present invention with reference to the accompanying drawings, and first describes a precision machining method for a large-caliber optical lens according to an embodiment of the present invention with reference to the accompanying drawings.
Fig. 3 is a flowchart of a precision machining method of a large-aperture optical lens according to an embodiment of the present invention.
As shown in fig. 3, the precision machining method of the large-caliber optical lens comprises the following steps:
in step S1, a first convex surface and a back end surface of a lenticular lens to be processed are obtained.
In step S2, before the first convex surface is finished, the back end surface of the first convex surface is configured as a concave spherical surface or a plane surface, so as to obtain a meniscus lens or a plano-convex lens.
The first convex surface is a positive portion of the lenticular lens to be processed, the second convex surface is a back portion of the lenticular lens to be processed, and in step S2, a back end surface of the first convex surface is not processed into the second convex surface.
That is, the back surface of the lenticular lens to be processed is configured as a suitable concave spherical surface or plane, and in turn, the lenticular lens itself to be processed is converted into a meniscus-type or plano-convex-type lens.
When the lens is constructed as a plano-convex lens, the aperture of the plane of the plano-convex lens needs to satisfy the condition that the predetermined detecting device can detect, and if not, it should be constructed as a meniscus lens as much as possible.
In step S3, the convex surface of the meniscus lens or the plano-convex lens is finished based on the zero compensation detection method of the large-caliber convex lens.
Specifically, as shown in fig. 4, in this case, the first convex surface is detected by the same principle as the aspheric convex surface and the convex spherical surface.
In step S4, a second convex surface of the lenticular lens to be processed is obtained.
In step S5, before finishing the second convex surface, a biconcave or plano-concave lens required for detection is constructed, and combined with the first convex surface to obtain a combination of approximately meniscus lenses or plano-convex lenses, and the constructed biconcave or plano-concave lens is called a relay lens.
The principle of constructing the biconcave or plano-concave lens required for detection is that the curvature radius of the two surfaces is coupled with the parameters of the two surfaces of the biconvex lens to be detected. When the curvature radius of the two surfaces of the relay lens is coupled with the two surface parameters of the biconvex lens, the high-precision detection of the two surfaces of the biconvex lens can be realized, and further the precise processing of the biconvex lens is realized.
That is, before the second convex processing of the lenticular lens to be processed is performed, a biconcave lens or a plano-concave lens is additionally constructed.
In step S6, the convex surface of the combination of the approximately meniscus lens or the plano-convex lens is finished by using the zero compensation detection method of the large-caliber convex lens, and the precise machining of the biconvex lens to be machined is completed.
Specifically, as shown in fig. 4-5, based on the zero compensation detection feature of the existing convex lens, a biconcave lens or a plano-concave lens is placed between the biconvex lens and the compensator component to construct a biconcave or plano-concave relay lens, so that modulation of the test light beam is realized, and excessive deflection of the first convex surface of the biconvex lens to be detected on light rays is compensated; thereby realizing an effect of regarding the combination of the relay lens and the lenticular lens to be detected as a meniscus lens or a plano-convex lens.
Further, as shown in fig. 4, the front and rear spherical surfaces of the lenticular lens to be processed are defined as a surface a and a surface B, respectively, and the front and rear surfaces of the relay lens to be constructed are defined as a 'and B', respectively, then a 'may be constructed as a concave surface corresponding to the radius of curvature a (in the limit case, a plane), and B' may be constructed as a concave surface corresponding to the radius of curvature B (in the limit case, a plane), i.e., the step S4 process. The effect of meniscus combination or plano-convex combination can be realized.
The process of forming and finishing the large-caliber lenticular lens according to the present invention will be further described with a specific embodiment based on the principle shown in fig. 2 to 6.
And D1, performing end face and cylindrical surface treatment on the blank of the biconvex lens to obtain a standard cylindrical cake material serving as the biconvex lens to be processed.
Step D2, as shown in FIG. 5, the surface form of the back is planned taking into consideration the curvature radius and caliber parameters of the convex surface A of the lenticular lens to be processed, and a concave spherical surface matched with A or a plane capable of completely detecting surface shape errors is selected.
And D3, finishing the forming of the convex surface A and adopting the principle shown in fig. 2 to realize the fine detection and the fine machining of the convex surface A.
And D4, as shown in fig. 5, constructing the biconcave lens or the plano-concave lens by taking the curvature radius and caliber parameters of the convex surfaces A and B of the biconvex lens to be processed into consideration.
And D5, finishing the forming of the convex surface B and adopting the principle shown in fig. 3 to realize the fine detection and the fine machining of the convex surface B.
According to the precise machining method for the large-caliber optical lens, disclosed by the embodiment of the invention, the problem that the surface shape error of the biconvex lens is difficult to detect is solved by adopting a mode of constructing the surface of the relay lens, and meanwhile, the precise inspection and machining of the two surfaces of the biconvex lens can be realized by adopting a method of back zero compensation detection, so that the precise machining method has an important effect on improving the optical precise machining capability.
Next, a precision machining system for a large-aperture optical lens according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 7 is a schematic diagram showing the structure of a precision machining system for a large-aperture optical lens according to an embodiment of the present invention.
As shown in fig. 7, the system 10 includes: a first acquisition module 100, a first construction module 200, a first finishing module 300, a second acquisition module 400, a second construction module 500, and a second finishing module 600.
The first acquisition module 100 is used for acquiring the first convex surface and the back end surface of the biconvex lens to be processed. The first construction module 200 is configured to construct the back end surface of the first convex surface into a concave spherical surface or a plane surface before finishing the first convex surface, so as to obtain a meniscus lens or a plano-convex lens. The first finishing module 300 is used for finishing the convex surface of a meniscus lens or a plano-convex lens based on a zero compensation detection method of a large-caliber convex lens. The second acquisition module 400 is configured to acquire a second convex surface of the lenticular lens to be processed. The second construction module 500 is used to construct a biconcave or plano-concave lens required for inspection before finishing the second convex surface, and combines with the first convex surface to obtain a biconcave or plano-concave lens of a combined structure approximating a meniscus lens or plano-convex lens, referred to as a relay lens. The second finishing module 600 is used for finishing the convex surface of the combination of the approximately meniscus lens or the plano-convex lens by using a zero compensation detection method of the large-caliber convex lens, so as to finish the precision machining of the biconvex lens to be machined.
Further, in one embodiment of the present invention, the first convex surface is a positive portion of the lenticular lens to be processed, and the second convex surface is a back portion of the lenticular lens to be processed.
Further, in one embodiment of the present invention, when configured as a plano-convex lens, the aperture of the plane of the plano-convex lens needs to satisfy the detection condition of the preset detection device, and if not, is configured as a meniscus lens.
Further, in one embodiment of the present invention, the relay lens is used to modulate the test beam to compensate for excessive deflection of the first convex surface of the lenticular lens to be detected to the light.
Further, in one embodiment of the present invention, the principle of constructing the biconcave or plano-concave lens required for detection in the second construction module 400 is that the radius of curvature of both surfaces is coupled with both surface parameters of the biconvex lens to be detected.
It should be noted that the foregoing explanation of the embodiment of the precision machining method for the large-aperture optical lens is also applicable to the system, and will not be repeated here.
According to the precision machining system for the large-caliber optical lens, disclosed by the embodiment of the invention, the problem that the surface shape error of the biconvex lens is difficult to detect is solved by adopting a mode of constructing the surface of the relay lens, and meanwhile, the precise inspection and machining of the two surfaces of the biconvex lens can be realized by adopting a method of back zero compensation detection, so that the precision machining system has an important effect on improving the optical precision machining capability.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (6)
1. A precision machining method of a large-caliber optical lens comprises the following steps:
step S1, obtaining a first convex surface and a back end surface of a biconvex lens to be processed;
s2, before finishing the first convex surface, constructing the back end surface of the first convex surface into a concave spherical surface or a plane to obtain a meniscus lens or a plano-convex lens;
s3, carrying out finish machining on the convex surface of the meniscus lens or the plano-convex lens based on a zero compensation detection method of the large-caliber convex lens;
s4, obtaining a second convex surface of the biconvex lens to be processed;
step S5, before finishing the second convex surface, constructing a biconcave or plano-concave lens required for detection, and combining the biconcave or plano-concave lens with the first convex surface to obtain a combination of an approximate meniscus lens or plano-convex lens, wherein the constructed biconcave or plano-concave lens is called a relay lens; the principle of constructing the biconcave or plano-concave lens required for detection is that the curvature radius of two surfaces is coupled with two surface parameters of the biconvex lens to be detected;
s6, finishing the convex surface of the combination body of the approximately meniscus lens or the plano-convex lens by using a zero compensation detection method of the large-caliber convex lens to finish the precision machining of the biconvex lens to be machined;
the relay lens is used for modulating the test light beam and compensating excessive deflection of the first convex surface of the lenticular lens to be detected to light rays.
2. The method of precision machining a large-caliber optical lens according to claim 1, wherein the first convex surface is a positive portion of the lenticular lens to be machined, and the second convex surface is a back portion of the lenticular lens to be machined.
3. The method according to claim 1, wherein when the lens is configured as a plano-convex lens, the planar aperture of the plano-convex lens is required to satisfy a detection condition of a predetermined detection device, and if not, the lens is configured as the meniscus lens.
4. A precision machining system for a large-caliber optical lens, comprising:
the first acquisition module is used for acquiring the first convex surface and the back end surface of the biconvex lens to be processed;
the first construction module is used for constructing the back end face of the first convex surface into a concave spherical surface or a plane before finishing the first convex surface to obtain a meniscus lens or a plano-convex lens;
the first finishing module is used for finishing the convex surface of the meniscus lens or the plano-convex lens based on a zero compensation detection method of the large-caliber convex lens;
the second acquisition module is used for acquiring a second convex surface of the biconvex lens to be processed;
the second construction module is used for constructing a biconcave or plano-concave lens required for detection before finishing the second convex surface and combining the biconcave or plano-concave lens with the first convex surface to obtain a combination of an approximate meniscus lens or plano-convex lens, and the constructed biconcave or plano-concave lens is called a relay lens; the principle of constructing the biconcave or plano-concave lens required for detection is that the curvature radius of two surfaces is coupled with two surface parameters of the biconvex lens to be detected;
the second finishing module is used for finishing the convex surface of the combination body of the approximately meniscus lens or the plano-convex lens by using a zero compensation detection method of the large-caliber convex lens to finish the precision machining of the biconvex lens to be machined;
the relay lens is used for modulating the test light beam and compensating excessive deflection of the first convex surface of the lenticular lens to be detected to light rays.
5. The system of claim 4, wherein the first convex surface is a positive portion of the lenticular lens to be processed and the second convex surface is a back portion of the lenticular lens to be processed.
6. The system according to claim 4, wherein when the lens is configured as a plano-convex lens, the planar aperture of the plano-convex lens is required to satisfy a detection condition of a predetermined detection device, and if not, the lens is configured as the meniscus lens.
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| CN112880982A (en) | 2021-06-01 |
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