CN111201111A - Improved method for preparing a lens blank for a surfacing operation thereof - Google Patents
Improved method for preparing a lens blank for a surfacing operation thereof Download PDFInfo
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- CN111201111A CN111201111A CN201880065844.0A CN201880065844A CN111201111A CN 111201111 A CN111201111 A CN 111201111A CN 201880065844 A CN201880065844 A CN 201880065844A CN 111201111 A CN111201111 A CN 111201111A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
- B24B13/005—Blocking means, chucks or the like; Alignment devices
- B24B13/0055—Positioning of lenses; Marking of lenses
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Abstract
A method of preparing a lens blank for further surfacing operations, the method transforming the lens blank into a surfaced lens for further transformation into a lens having a lens shape, the surfacing operations comprising machining the lens blank such that the surfaced lens exhibits a contoured diameter, the method being implemented using a processing module and comprising: -defining a temporary shaping diameter (D) based on Input Data (ID) defining the lens shapetemp) Such that the temporary reshaped diameter satisfies a set of constraints, the set of constraints including at least: -a first constraint, wherein the temporary reshaped diameter (D)temp) Is large enough to make the surface-treated lens with the temporary reshaped diameter suitable for being processed into the lensA lens, -a second constraint, wherein the temporary reshaped diameter is large enough for the surface-treated lens with the temporary reshaped diameter to comprise a plurality of reference points defined on the lens blank and collectively identifying the optical center of the lens, -a function of the temporary reshaped diameter (D)temp) Selecting the shaping diameter configured such that, when a step-shaping configuration is intended to be applied to the surfacing operation, the shaping diameter is selected from at least one predetermined discrete value (Val)i)。
Description
Technical Field
The present invention relates to the field of industrial surface treatment processes for the manufacture of ophthalmic lenses.
More particularly, the invention relates to a method for optimizing the peripheral shape to be transferred onto a lens blank of which the surface treatment is intended to transform into a final lens.
Background
Generally, ophthalmic lenses are specially manufactured according to the needs of each wearer, which may take the form of specifications defined in a prescription established by an ophthalmologist.
For the manufacture of lenses, a lens blank is subjected to various steps to form the desired lens, in particular a step of surfacing, during which the shape of the lens blank is machined to produce a lens, which may be referred to as a surfaced lens, such that the surfaced lens exhibits the desired optical properties.
In practice, such operations are often carried out on semi-finished lens blanks whose front surfaces have previously been machined, the surfacing operation affecting essentially one of the surfaces of the lens blank, typically the rear surface, according to the prescription.
In the context of the present invention, the surfacing step comprises machining the lens blank to reduce its outer shape to a shape that is typically, although not necessarily, circular, thereby exhibiting a selected or tailored diameter (crib diameter). This operation is generally performed so that the resulting surface-treated lens can then be more easily retained during subsequent steps, which typically include the steps of: during this step, the lens is immersed in the coating liquid while being held by a device such as a ring.
However, this process (also known as framing) is subject to various constraints that can be easily translated into a very different group of potential reshaped diameters resulting therefrom.
This is undesirable because it often requires that the manufacturing process be adjusted according to the lens being manufactured, particularly in terms of the equipment used to hold the lens that has been shaped, for example, for its coating.
Disclosure of Invention
The present invention seeks to improve this situation.
To this end, the invention relates to a method of preparing a lens blank for a further surfacing operation of the lens blank, the method being configured to transform the lens blank finally into a surfaced lens for further transformation into a lens having a lens shape and intended to be coupled to a frame, the surfacing operation comprising machining the lens blank so that the surfaced lens exhibits a shaped diameter, the method being implemented using a processing module and comprising:
-defining a temporary shaping diameter based on input data defining the lens shape such that the temporary shaping diameter satisfies a set of constraints, the set of constraints comprising at least:
-a first constraint wherein the temporary reshaped diameter is large enough to make the surface treated lens with the temporary reshaped diameter suitable for being processed into the lens,
-a second constraint, wherein the temporary reshaped diameter is large enough so that the surface treated lens with the temporary reshaped diameter comprises a plurality of reference points defined on the lens blank and collectively identifying the optical center of the lens,
-selecting the shaping diameter as a function of the temporary shaping diameter, the selected shaping diameter being configured such that the shaping diameter is selected from at least one predetermined discrete value when a step-shaping configuration is intended to be applied to the surface treatment operation.
According to an aspect of the invention, the reshaped diameter is selected to correspond to a smallest discrete value larger than the temporary reshaped diameter.
According to an aspect of the invention, the method further comprises generating a surface file to be used in the surfacing operation for generating the lens shape when a surface extension configuration is intended to be applied to the surfacing operation, such that the lens shape is circular with a diameter corresponding to the reshaping diameter.
According to an aspect of the invention, the one or more predetermined discrete values are formed by a single value.
According to an aspect of the invention, the temporary shaping diameter is selected to be the minimum value that satisfies the set of constraints.
According to an aspect of the invention, the set of constraints comprises a third constraint according to which the temporary shaping diameter is greater than or equal to a minimum shaping diameter of a device intended to be used for reducing the diameter of the lens blank during the surfacing operation.
According to an aspect of the invention, in order to satisfy the first constraint, the temporary shaping diameter is taken to be greater than or equal to a lens shape parameter defined based on twice a maximum radius of the lens shape.
According to an aspect of the invention, when the generated lens shape is a circle, the lens shape parameter is taken to be equal to twice the radius of the lens shape.
According to an aspect of the invention, the lens shape parameter is taken to be equal to twice the sum of the maximum radius and a margin defined based on the shape of the frame to which the lens is intended to be coupled.
According to an aspect of the invention, to satisfy the second constraint, the temporary shaping diameter is selected to be greater than or equal to a reference parameter defined on the basis of twice the distance between the center of the lens shape and a reference point of the lens blank that is farthest from the center in the blocking and turning reference system of the lens blank during the surfacing operation.
According to an aspect of the invention, the reference parameter is taken to be equal to twice the sum of the distance and a predetermined margin.
The invention also relates to a computer program comprising instructions intended to be executed by a processor in order to implement a method as defined above.
The invention also relates to a method of surfacing a lens blank, configured to transform the lens blank finally into a surfaced lens for further transformation into a lens having a lens shape and intended to be coupled to a frame, the method comprising:
-preparing a lens blank for surfacing using a method of preparing said lens blank as defined above, to obtain a shaped diameter, and
-surfacing the lens blank, the surfacing of the lens blank comprising machining the lens blank such that the surfaced lens exhibits a reshaping diameter.
The invention also relates to a device for preparing a lens blank for a further surfacing operation of the lens blank, the device being configured to transform the lens blank finally into a surfaced lens having a lens shape for further transformation into a lens coupled to a frame, the surfacing operation comprising machining the lens blank so that the surfaced lens exhibits a contoured diameter, the device comprising a processing module configured to:
-defining a temporary shaping diameter based on input data defining the lens shape such that the temporary shaping diameter satisfies a set of constraints, the set of constraints comprising at least:
-a first constraint wherein the temporary reshaped diameter is large enough to make the surface treated lens with the temporary reshaped diameter suitable for being processed into the lens,
-a second constraint, wherein the temporary reshaped diameter is large enough so that the surface treated lens with the temporary reshaped diameter comprises a plurality of reference points defined on the lens blank and collectively identifying the optical center of the lens,
-selecting the shaping diameter as a function of the temporary shaping diameter, the processing module being configured to select the shaping diameter such that, in response to a stepped shaping configuration intended to be applied to the surface treatment operation, the shaping diameter is selected from at least one predetermined discrete value.
Drawings
Other features and advantages of the invention will become apparent from the following description for indicative and non-limiting purposes, with reference to the accompanying drawings, in which:
figure 1 illustrates a lens blank, a surface-treated lens and a finished lens;
figure 2 illustrates a system according to the invention;
figure 3 schematically illustrates a method of manufacturing a lens according to the invention; and
fig. 4 illustrates steps in the preparation steps of the method of fig. 3.
Detailed Description
Fig. 1 illustrates a LENs blank BLA used in the context of the present invention, with the aim of manufacturing an ophthalmic LENs or a finished LENs LEN designed to exhibit optical properties. In particular, the LENs LEN obtained advantageously exhibits vision correction characteristics that solve the vision problems of its intended wearer. The LENs LEN is typically designed to be coupled to a frame (not shown) to define, with the frame, eyeglasses to be worn by a wearer.
In order to obtain the LENs LEN, the LENs blank BLA, which is designed to be machined into the resulting LENs, is subjected to a series of operations, the general corresponding principles of which are typically known.
One of these operations of interest to the present invention is the surfacing of a LENs blank to thereby produce a surfaced LENs SLE, which itself is subjected to further operations to produce a LENs LEN. It should be noted that the surface treated LENs LEN advantageously exhibits the target optical properties of the LENs LEN.
Advantageously, the lens blank BLA used during this step is a semi-finished lens blank. In other words, one of its surfaces has been machined to the desired shape. Typically, when a surface treatment operation is to be performed, the front surface has thus been machined, so that only the rear surface is machined. The term "lens blank" shall be understood to include configurations in which the lens blank is semi-finished and configurations in which the lens blank is not semi-finished, but is preferably semi-finished, regardless of whether the lens blank is of the semi-finished type thereafter.
As to the details of the surfacing operation, said step is generally carried out around the removal of some substance from the LENs blank in order to shape the LENs blank BLA into a surfaced LENs LEN.
In particular, in the sense of the present invention, this operation comprises a step of shaping the lens blank BLA, said step corresponding to the external shape of the lens blank being reduced in size to what is called the shaping diameter DcribThe diameter of (2).
In effect, the shaping step results in a surface treated lens SLE having an outer shape that can be circular or non-circular. When not circular, the term "diameter" is understood to mean the largest diameter unless otherwise specified.
This outer shape is intended to be in contact with the equipment during a further step of the process, typically the step of coating the surface treated lens. For example, the outer shape of the surface-treated lens is retained by a ring that is used to immerse the surface-treated lens in the coating material.
Fig. 2 illustrates a system SYS according to the present invention, configured to be used generally during a surfacing operation to shape a lens blank BLA into a surfaced lens SLE.
The system SYS comprises a generator GEN adapted to remove matter from the lens blank BLA during the surfacing itself, to shape the lens blank BLA into a surfaced lens SLE. In addition, the system SYS comprises an apparatus APP adapted to at least partially prepare the surface treatment itself of the lens blank BLA. More specifically, as described below, the device APP is configured to determine what is denoted D hereinaftercribIs applied to the lens blank BLA during the surfacing operation.
With regard to the generator GEN, the generator advantageously comprises a grinding module GRIN and/or a cutting module CUT respectively configured to remove some substance of the LENs blank BLA to shape the LENs blank BLA into the produced LENs LEN by grinding, respectively cutting.
For example, the grinding module and the cutting module are movable relative to the body of the generator holding the lens blank BLA.
For example, for this purpose, the lens blank BLA is fixed on a support held by the generator. Advantageously, the lens blank BLA is held in the following way: the approach advantageously allows the lens blank to be moved, typically rotated, relative to the body of the generator.
With regard to the apparatus APP, as indicated above, said apparatus is configured to prepare a surfacing operation of the lens blank, in particular to determine the shaping diameter to be reached by the lens blank BLA during this operation.
In a general sense, the device APP may be a stand-alone device dedicated to the preparation of the surface treatment.
Alternatively, the apparatus may be combined with one or more other apparatuses (such as the generator itself) intended for use during ophthalmic lens manufacture.
As shown in fig. 2, the device APP is a computer apparatus. The computer arrangement comprises a processing module PROC, a memory MEM, a communication interface COM and a human-machine interface HMI.
The processing module PROC is configured to implement a method for preparing a lens blank BLA in the sense of the present invention, which is described in detail below.
The processing module PROC comprises one or more processors CPU configured to process instructions for implementing the method according to the invention.
This processor may be of any known type.
The memory MEM is configured to store computer programs and data intended to be processed by the processing module PROC for the operation of the device APP. Typically, the memory may include one or more programs that define an operating system that the device provides for performing routine operations. Advantageously, the memory also comprises a computer program PRG comprising instructions intended to be executed by the processing module MOD, for implementing the method according to the invention described in detail below.
As regards the data, in the context of the present invention, said data comprise input data ID configured to describe the shape of the LENs LEN or the LENs shape to be obtained at the end of the manufacturing process.
It should be noted that this lens shape is to be distinguished from the shape of the surface treated lens SLE or the surface treated lens shape, which is the shape obtained by machining the lens blank BLA by surface treatment of the lens blank BLA.
At a certain level, the input data ID may advantageously comprise a model of the lens, i.e. a model of the manufactured lens. Advantageously, this model is represented in the blocking/lathing reference frame of the lens, i.e. using the centre of rotation of the lens blank during surfacing as its origin and its axis or axes correspond to the axis of rotation of the lens blank during surfacing.
For example, the model includes a model of the anterior and posterior surfaces of the lens, as well as the kinematics between the two surfaces.
Advantageously, the input data ID also comprises data describing the shape of the LENs, i.e. the shape of the manufactured LENs LEN. For example, the data includes a tracing shape of the lens of the wearer. Optionally, the data further comprises diameter information. This is the case, for example, when the optical properties of the lens require a diameter that is not considered typical.
The memory MEM may also contain configuration data CFGD that defines preferences for surface treatment operations to take place after preparation.
The configuration data CFGD advantageously includes a frame shape margin M whose value is predeterminedFS. This frame shape margin corresponds to the margin provided for the surface treated LENs SLE to ensure a good fit between the LENs LEN and the frame FRA once the LENs has been further processed.
Advantageously, the configuration data CFGD comprises step shaping parameters defining whether a step shaping configuration is to be realized for the surface treatment, wherein the shaping diameter DcribSelected from at least one predetermined discrete value Vali. It should be noted that there may be a single discrete value.
The configuration data CFGD advantageously comprises a list of preferred diameters. For example, these preferred diameters correspond to the discrete values Val from which the shaping diameter is selectedi。
The configuration data CFGD advantageously comprises a minimum generator shaping diameter (denoted MinGen) corresponding to the minimum shaping diameter that the generator GEN is adapted to provide.
The configuration data CFGD advantageously comprises a surface extension parameter which describes whether a surface extension configuration is achieved for the surface treatment, wherein the surface-treated lens has a shape which is purposefully extended into a circular shape.
Advantageously, the data contained in the memory MEM also comprise reference data REFD defining a reference point PREFAre defined on the lens blank and together doThe optical center of the LENs LEN is determined.
The position of the reference point is for example represented in a given reference frame, such as the PRP reference frame (prism reference point reference frame). The prism reference point corresponds to the optical center of the lens. This frame of reference includes three axes passing through the prism reference point, such as a horizontal axis, a vertical axis, and an axis passing through the lens and perpendicular to the front surface of the lens. This reference frame may correspond to a blocking/turning reference frame.
Reference point PREFMay take the form of a circle, such as a micro-circle.
The human machine interface HMI is adapted to allow an operator to input data into the device APP and/or to display data for the operator.
The data in question may be any data, in particular data contained in a memory, which forms all or part of the configuration data CFGD, the input data ID or the reference data REFD.
The human machine interface HMI may comprise input means such as a keyboard, mouse, etc. The input device may also include a screen, optionally in combination with a mouse and/or keyboard to define a touch sensitive screen.
As far as the communication interface COM is concerned, it is suitable for communication between the apparatus APP and one or more remote devices.
The communication modules COMM may support any cable and/or non-cable communication technology.
A method of manufacturing a LENs LEN (shown in broken lines in fig. 1) from a LENs blank BLA according to the invention will now be described with reference to the figures, including fig. 4.
Referring to fig. 3, in a general sense, and as discussed above, the manufacturing includes the step of surface treating a lens blank BLA into a surface treated lens SLE during step S1.
The process also includes further processing the surface treated LENs SLE into a desired LENs LEN in step S2. This further processing is not a central aspect of the invention and will therefore not be discussed in more detail. In fact, any known technique may be applied for this purpose.
As for step S1, it includes preparation of the surface treatment of the lens blank BLA (denoted PREP) and the surface treatment itself of the lens blank BLA (denoted SURF).
With respect to preparing a PREP, as discussed, its goal, or one of its goals, is to determine a reshaped diameter DcribThe shaped diameter is imparted to the surface treated lens SLE during surface treatment SURF. It is implemented by the device APP and in particular by the processing module PROC using the memory MEM.
In a general sense, this determination relies on defining a temporary shaping diameter D that satisfies a set of constraintstempAnd relies on the temporary reshaped diameter based DtempTo select the reshaping diameter DcribSuch that the diameter D is shaped when the step-shaping configuration is intended to be applied to the operation of surface treating SURFcribSelected from at least one predetermined discrete value.
The set of constraints includes at least one constraint, and advantageously a plurality of constraints.
Advantageously, the set of constraints comprises a first constraint, wherein the temporary reshaped diameter DtempIs sufficiently large to make the surface treated lens SLE having the temporary reshaped diameter suitable for processing into the lens. In other words, the temporary reshaped diameter DtempIs selected such that it is possible to obtain a lens from the surface-treated lens if the surface-treated lens shape has this temporary reshaping diameter.
Determining a temporary truing diameter DtempTo verify this first constraint during step T1.
For this purpose, the diameter D is temporarily reshapedtempIs taken to be greater than or equal to a lens shape parameter defined based on two times the maximum radius of the lens shape.
In more detail, it is determined whether the lens shape is a circular shape based on the input data ID and the lens shape defined therein.
If so, the lens shape parameter and thus the temporary shaping diameter D is determinedtempIs set to twice the radius of the lens shape, which also corresponds to its maximum radius.
If the LENs LEN is not circular in shape,then the lens shape parameters are set to the maximum radius of the lens shape and the frame shape margin MFSTwice the sum of the sum. In practice, this margin is selected based on the shape of the frame to which the lens is intended to be coupled. Typically, this margin is designed to ensure that the reshaped diameter does not come too close to the final lens shape, thus avoiding any loss of material inside the frame.
The set of constraints advantageously comprises a second constraint in which the temporary reshaped diameter DtempIs large enough for the surface-treated lens with said temporary reshaped diameter to comprise a plurality of reference points PREF. In other words, the constraint aims to ensure that the reference point is not removed from the lens blank when the latter is shaped.
Determining a temporary truing diameter DtempTo verify the second constraint during step T2.
In detail, during this step T2, the diameter D is temporarily shapedtempIs selected to be greater than or equal to a reference parameter defined on the basis of twice the distance between the center of the lens shape and the reference point of the lens blank furthest from said center in the blocking/turning reference system of the lens blank during the surfacing operation. In practice, for each reference point, the distance between this center and the reference point is determined, the obtained distances are summed to obtain a margin distance, and the maximum value obtained from the respective reference point (e.g. noted as Rmc) is selected as the reference parameter. This margin distance is chosen to be 1mm, for example.
Then, the current temporary truing diameter D is determinedtempIs less than twice the value Rmc.
If so, the diameter D will be temporarily reshapedtempSet to twice the value of Rmc.
If not, the current temporary truing diameter D is maintainedtemp。
Advantageously, the set of constraints comprises a third constraint according to which the temporary shaping diameter is greater than or equal to the minimum generator shaping diameter MinGen. In other words, this constraint aims to ensure that the shaping diameter is realistic in view of the constraints of the generator GEN.
Determining a temporary truing diameter DtempTo verify the third constraint during step T3.
During this step, the current temporary truing diameter D is determinedtempWhether less than the minimum generator shaping diameter MinGen.
If so, the current temporary reshaped diameter DtempSet to the minimum generator shaping diameter MinGen.
If not, the current temporary truing diameter D is maintainedtemp。
In practice, steps T1 to T3 may be implemented in any order. Temporarily shaping the diameter D before the first of these stepstempAdvantageously set to zero. In fact, through these steps, the diameter D is temporarily reshapedtempAdvantageously selected as the minimum value that satisfies the set of constraints.
During a step T4, which is preferably performed after steps T1 to T3, it is determined whether a step-shaping configuration is implemented for the surface treatment SURF. This operation is implemented based on configuration data CFGD.
In practice, the step-shaping parameters are analyzed to see if this is the case.
If no step-shaping configuration is implemented for the SURF, based on the current temporary shaping diameter DtempTo select the reshaping diameter Dcrib. Advantageously, it is taken to be equal to the current temporary truing diameter Dtemp。
If a step-shaping configuration is implemented, it is determined whether the preferred diameters contained in the configuration data CFGD include at least one preferred diameter that is larger than the current temporary shaping diameter Dtemp。
If they contain such diameters, the current temporary reshaped diameter DtempIs set to a value selected from these values. Advantageously, it is then taken to be equal to the minimum preferred diameter, which is greater than the current temporary truing diameter Dtemp。
If the preferred diameter does not contain more than the current temporary truing diameterDiameter of the diameter, then maintaining the current temporary reshaped diameter Dtemp。
Then based on the temporary reshaped diameter DtempTo select the reshaping diameter Dcrib. Advantageously, it is taken to be equal to the temporary truing diameter Dtemp。
In fact, at the end of step S4, the diameter D is reshapedcribWith the given values forming the final value of the reshaped diameter.
During an optional step T5, preferably implemented after step T4, it is then determined whether a surface extension configuration is implemented for the surface treatment SURF.
If so, a surface file is generated. This surface file contains a definition of the shape of the surface-treated lens. The surface file is intended to be used during operation of the surface treatment SURF for generating a shape of the surface treated lens shape such that the shape of the surface treated lens is circular with a diameter corresponding to the shaping diameter. Typically, this surface file is intended to be used as an input to a generator for determining the processing details of the lens blank BLA.
In other words, when the surface extension is activated, this step comprises instructions intended to the generator GEN so that the surface-treated lens is shaped with a shaped diameter D during the surface treatment SURFcribWherein this shape can be seen as an extension with respect to a configuration in which no surface extension configuration is achieved.
If the surface extension configuration is not achieved, the process stops.
After this step, the diameter D is shaped, whether or not before step T5cribAre output by the device for use by the generator GEN as input for the subsequent surface treatment SURF.
Surface treatment SURF advantageously uses a shaped diameter DcribMachining the lens blank BLA and using various other data, such as data reflecting the data contained in the memory MEM of the device.
This output of the preparation PREP is passed through the communication module COM and/or through the human machine interface HMI, where it is then transferred to the generator GEN.
During the surfacing SURF, the lens blank is then machined by the generator GEN, the resulting surfaced lens SLE having the shaped diameter D determined during the preparation of the PREPcrib。
The present invention provides several advantages.
Indeed, in the context of manufacturing ophthalmic lenses, the present invention greatly helps to reduce the dimensional variations caused by the surface treatment of the lens blank.
In addition, it is easy to adapt to the various situations and constraints imposed by the equipment available for manufacturing.
Moreover, it does not require a large amount of computing resources and, therefore, can be implemented on various types of computer devices.
It should be noted that the core aspect of the invention has been described as a method of preparing a lens blank. However, it can be seen as a method of surfacing a lens blank to obtain a surfaced lens, or as a method of shaping a lens blank to form an ophthalmic lens, wherein the corresponding method comprises the initial step of determining the shaping diameter detailed above.
Claims (14)
1. A method of preparing a LENs Blank (BLA) for further surfacing operations of the LENs blank, the method being configured to transform the LENs blank finally into a Surfaced LENs (SLE) for further transformation into a LENs (LEN) having a LENs shape and intended to be coupled to a frame, the surfacing operations comprising machining the LENs Blank (BLA) so that the surfaced LENs exhibits a contoured diameter (D)crib) The method is implemented using a processing module and includes:
-defining a temporary shaping diameter (D) based on Input Data (ID) defining the lens shapetemp) Such that the temporary reshaped diameter satisfies a set of constraints, the set of constraints including at least:
-a first constraint, wherein the temporary reshaped diameter (D)temp) Is large enoughSuch that the surface treated LENs with the temporarily reshaped diameter is suitable to be processed into the LENs (LEN),
-a second constraint, wherein the temporary reshaped diameter is large enough so that the surface treated lens with the temporary reshaped diameter comprises a plurality of reference points defined on the lens blank and collectively identifying the optical center of the lens,
-according to said temporary reshaped diameter (D)temp) To select said truing diameter (D)crib) Said selected shaping diameter being configured such that, when a step-shaping configuration is intended to be applied to said surfacing operation, said shaping diameter is selected from at least one predetermined discrete value (Val)i)。
2. Method according to claim 1, wherein the reshaped diameter (D)crib) Is selected to correspond to a diameter greater than the temporary reshaped diameter (D)temp) The minimum discrete value of (c).
3. Method according to claim 1 or 2, further comprising generating a surface file to be used in the surfacing operation for generating the lens shape when a surface extension configuration is intended to be applied to the surfacing operation, such that the lens shape is circular with a diameter corresponding to the shaping diameter (D ™)crib)。
4. A method according to claims 2 and 3, wherein the one or more predetermined discrete values are formed from a single value.
5. Method according to any one of the preceding claims, wherein the temporarily reshaped diameter (D)temp) The minimum value selected to satisfy the set of constraints.
6. Method according to any one of the preceding claims, wherein said set of constraints comprises a third constraint according to which said temporary shaping diameter is greater than or equal to a minimum shaping diameter of a device intended to be used for reducing the diameter of the lens blank during the surfacing operation.
7. The method according to any of the preceding claims, wherein, in order to satisfy the first constraint, the temporary shaping diameter is taken to be greater than or equal to a lens shape parameter defined based on twice a maximum radius of the lens shape.
8. The method according to any of the preceding claims, wherein the lens shape parameter is taken to be equal to twice the radius of the lens shape when the generated lens shape is circular.
9. The method according to any of the preceding claims, wherein the lens shape parameter is taken to be equal to twice the sum of the maximum radius and a margin defined based on the shape of the frame to which the lens is intended to be coupled.
10. Method according to any one of the preceding claims, wherein, to satisfy the second constraint, the temporary reshaped diameter (D)temp) Is selected to be greater than or equal to a reference parameter defined based on twice the distance between the center of the lens shape and the reference point of the lens blank furthest from the center in the blocking and turning reference system of the lens blank during the surfacing operation.
11. The method of claim 10, wherein the reference parameter is taken to be equal to twice the sum of the distance and a predetermined margin.
12. A computer program comprising instructions intended to be executed by a processor in order to implement the method according to any of the preceding claims.
13. A method of surfacing a lens Blank (BLA) configured to transform the lens blank finally into a Surfaced Lens (SLE) for further transformation into a lens having a lens shape and intended to be coupled to a frame, the method comprising:
-preparing the lens Blank (BLA) for surfacing using the method of preparing a lens blank according to any one of claims 1 to 11, and
-surfacing the lens blank, the surfacing of the lens blank comprising machining the lens blank such that the surfaced lens exhibits a reshaping diameter.
14. An apparatus for preparing a LENs Blank (BLA) for further surfacing operations of the LENs blank, the apparatus being configured to transform the LENs blank finally into a surface treated LENs (SLE) having a LENs shape for further transformation into a LENs (LEN) coupled to a frame, the surfacing operations comprising machining the LENs blank such that the surface treated LENs (SLE) exhibits a reshaped diameter, the apparatus comprising a processing module (PROC) configured to:
-defining a temporary shaping diameter (D) based on input data defining the lens shapetemp) Such that said temporary reshaped diameter (D)crib) Satisfying a set of constraints, said set of constraints comprising at least:
-a first constraint wherein the temporary reshaped diameter is large enough to make the surface treated lens with the temporary reshaped diameter suitable for being processed into the lens,
-a second constraint, wherein the temporary reshaped diameter is large enough so that the surface treated lens with the temporary reshaped diameter comprises a plurality of reference points defined on the lens blank and collectively identifying the optical center of the lens,
-according to said temporary reshaped diameter (D)temp) To select the shapingDiameter (Dcrib) The processing module is configured to select the shaping diameter such that the shaping diameter is selected from at least one predetermined discrete value in response to a step-shaping configuration being intended to be applied to the surface treatment operation.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP17306387.6A EP3470171B1 (en) | 2017-10-13 | 2017-10-13 | An improved method of preparing a lens blank for an operation of surfacing thereof |
| EP17306387.6 | 2017-10-13 | ||
| PCT/EP2018/077270 WO2019072742A1 (en) | 2017-10-13 | 2018-10-08 | An improved method of preparing a lens blank for an operation of surfacing thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111201111A true CN111201111A (en) | 2020-05-26 |
| CN111201111B CN111201111B (en) | 2023-01-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880065844.0A Active CN111201111B (en) | 2017-10-13 | 2018-10-08 | Improved method for preparing a lens blank for a surfacing operation thereof |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20200276684A1 (en) |
| EP (1) | EP3470171B1 (en) |
| CN (1) | CN111201111B (en) |
| MX (1) | MX2020003837A (en) |
| PH (1) | PH12020550199A1 (en) |
| WO (1) | WO2019072742A1 (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5485771A (en) * | 1991-09-27 | 1996-01-23 | Coburn Optical Industries, Inc. | Apparatus for generating ophthalmic products from blanks and a method of operating same |
| WO2006084771A1 (en) * | 2005-02-14 | 2006-08-17 | Essilor International (Compagnie Generale D'optique) | Process for the manufacture of spectacle lenses |
| CN101443155A (en) * | 2006-05-10 | 2009-05-27 | 埃西勒国际通用光学公司 | Method and device for trimming a lens by cutting said lens |
| JP2009125877A (en) * | 2007-11-26 | 2009-06-11 | Hoya Corp | Lens holder and curved-surface polishing method for lens |
| CN103930822A (en) * | 2011-11-16 | 2014-07-16 | 埃西勒国际通用光学公司 | Process of determination of a semi - finished blank |
| US20140329443A1 (en) * | 2013-05-06 | 2014-11-06 | Satisloh Ag | Multi Part Blocking Piece |
| CN104768708A (en) * | 2012-10-30 | 2015-07-08 | 埃西勒国际通用光学公司 | Method for manufacturing ophthalmic lenses by machining |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006003939A1 (en) * | 2004-06-30 | 2006-01-12 | Hoya Corporation | Method of manufacturing spectacle lens |
-
2017
- 2017-10-13 EP EP17306387.6A patent/EP3470171B1/en active Active
-
2018
- 2018-10-08 US US16/754,222 patent/US20200276684A1/en active Pending
- 2018-10-08 MX MX2020003837A patent/MX2020003837A/en unknown
- 2018-10-08 CN CN201880065844.0A patent/CN111201111B/en active Active
- 2018-10-08 WO PCT/EP2018/077270 patent/WO2019072742A1/en active Application Filing
-
2020
- 2020-04-01 PH PH12020550199A patent/PH12020550199A1/en unknown
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5485771A (en) * | 1991-09-27 | 1996-01-23 | Coburn Optical Industries, Inc. | Apparatus for generating ophthalmic products from blanks and a method of operating same |
| WO2006084771A1 (en) * | 2005-02-14 | 2006-08-17 | Essilor International (Compagnie Generale D'optique) | Process for the manufacture of spectacle lenses |
| CN101443155A (en) * | 2006-05-10 | 2009-05-27 | 埃西勒国际通用光学公司 | Method and device for trimming a lens by cutting said lens |
| JP2009125877A (en) * | 2007-11-26 | 2009-06-11 | Hoya Corp | Lens holder and curved-surface polishing method for lens |
| CN103930822A (en) * | 2011-11-16 | 2014-07-16 | 埃西勒国际通用光学公司 | Process of determination of a semi - finished blank |
| CN104768708A (en) * | 2012-10-30 | 2015-07-08 | 埃西勒国际通用光学公司 | Method for manufacturing ophthalmic lenses by machining |
| US20140329443A1 (en) * | 2013-05-06 | 2014-11-06 | Satisloh Ag | Multi Part Blocking Piece |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019072742A1 (en) | 2019-04-18 |
| CN111201111B (en) | 2023-01-06 |
| EP3470171A1 (en) | 2019-04-17 |
| MX2020003837A (en) | 2020-08-06 |
| PH12020550199A1 (en) | 2021-03-01 |
| EP3470171B1 (en) | 2021-01-20 |
| US20200276684A1 (en) | 2020-09-03 |
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