Electrochromic lens comprising a wafer having a perimeter shoulder

Abstract

The present invention relates to an optical system (1) comprising a wafer (3) and an optical element (5). The wafer and the optical element are bonded to each other by an adhesive material (7), and the wafer has a perimeter shoulder (9). Generally, the wafer includes a rear surface designed according to the wearer's prescription and a front surface intended to be bonded to the optical element. The optical element may be an electrochromic cell.

Description

Technology Field

[0001] The present invention relates to the field of optical systems, more specifically, to the field of optical systems comprising a wafer and an electrochromic cell tailored to an ophthalmic prescription.

[0002] Such optical systems are also known as "electrochromic lenses" in the field of ophthalmic lenses. Background Technology

[0003] Ophthalmic lenses help correct visual impairments or refractive errors, also known as anamorphic vision, such as myopia, hyperopia, astigmatism, and presbyopia. Ophthalmic lenses are manufactured based on the wearer's ophthalmic prescription. The prescription includes various information such as sphere value, cylinder value, prism, and progressive power.

[0004] However, even when ophthalmic lenses are manufactured to be configured for the wearer's different circumstances, there is a demand for smart glasses with greater adaptability, particularly in progressive lenses capable of correcting both near and far vision.

[0005] To this end, the ophthalmic lens industry has developed electroactive lenses, that is, lenses whose specific characteristics can be electronically modified. These changes can be controlled by the wearer or by a healthcare professional, typically an ophthalmologist. These changes can also be automatic, in which case the electroactive lens may include sensors configured to measure specific parameters of the environment, such as light intensity or the wavelength of light.

[0006] In particular, among electroactive lenses, there are electrochromic lenses that can change light transmittance and tinting values.

[0007] Generally, an electrochromic lens is an optical system comprising a wafer manufactured based on prescription data and an electrochromic cell that enables the electrochromic lens thus formed to be configured to match brightness or light intensity. A portion of the prescription may also be provided by the electrochromic cell.

[0008] An electrochromic cell generally has a structure comprising two flat, transparent outer layers, for example, two surfaces made of organic or mineral materials, and a transparent electrically conductive coating is deposited on the inner surface thereon. An electrochromic composition fills the cavity formed between the two electrically conductive coatings. Thus, the light transmittance of the cell can be changed by applying an electric field between the electrically conductive coatings.

[0009] Therefore, an electrochromic lens is manufactured by bonding or adhering a wafer and an electrochromic cell together, and the electrochromic lens must be configured to be mounted in an eyeglass frame. Furthermore, when the electrochromic lens is received in the eyeglass frame, more precisely in the bezel or recess, the electrochromic lens must remain undamaged even when subjected to impact.

[0010] More generally, the assembly of wafers and optical elements is complex, whether the latter is an electrochromic cell or an optical waveguide. Additionally, there is a risk of water or dust penetrating between the wafer and the optical elements. The problem to be solved

[0011] The present invention aims to improve this situation. means of solving the problem

[0012] The present invention relates to an optical system, and,

[0013] - Wafer, and

[0014] - Optical element

[0015] Includes

[0016] The wafer and optical elements are bonded to each other by an adhesive material. The wafer has a perimeter shoulder.

[0017] According to an embodiment, the perimeter shoulder forms a perimeter section and a central section of the wafer, and the perimeter section has an average thickness thinner than the average thickness of the central section.

[0018] Advantageously, the average thickness of the perimeter section is thicker than the average thickness of the adhesive material between the wafer and the optical element.

[0019] Generally, the periphery section and the central section each include a front surface facing the optical element, referred to respectively as the periphery front surface and the central front surface. The periphery front surface and the central front surface together form the front surface of the wafer.

[0020] According to an embodiment, the adhesive material is provided only on the perimeter front surface.

[0021] Advantageously, the radius of curvature of a portion of the front surface of the wafer is substantially the same as the radius of curvature of the corresponding facing portion of the optical element's surface.

[0022] For example, the front surface of the wafer is spherical, and the rear surface of the optical element is also spherical with the same curvature. This allows for a front surface of the wafer independent of the shape or formulation of the frame while maintaining a minimum distance between the front surface of the wafer and the corresponding surface of the optical element. Therefore, it is advantageous to manufacture a stock of wafers having a spherical front surface. Subsequently, it is sufficient to accurately position the optical center of the wafer relative to the frame and create a perimeter shoulder with a grinder.

[0023] Generally, each of the periphery section and the central section includes a rear surface, referred to as the periphery rear surface and the central rear surface, respectively, and the periphery rear surface and the central rear surface are opposed to the periphery front surface and the central front surface, respectively. The periphery rear surface and the central rear surface together form the rear surface of the wafer.

[0024] According to an embodiment, a portion of the perimeter shoulder has an angular shape, and the perimeter rear surface forms a local angle with the central rear surface.

[0025] According to an embodiment, a portion of the perimeter shoulder has a bevel shape, and the perimeter rear surface is a beveled surface that joins the edge of the perimeter rear surface to the central rear surface.

[0026] According to an embodiment, a portion of the perimeter shoulder has a curved shape, and the perimeter rear surface is tangential to the central rear surface at the proximity to the central rear surface.

[0027] For example, adhesive materials include glue and / or rubber.

[0028] Advantageously, the optical system further includes a spacing member within the adhesive material to maintain an air gap between the wafer and the optical element.

[0029] According to an embodiment, the wafer comprises a rear surface designed and surface-treated according to the wearer's ophthalmic prescription, and a front surface facing the rear surface and intended to be bonded to an optical element.

[0030] According to an embodiment, the optical element includes an electrochromic cell.

[0031] According to an embodiment, the optical element includes an optical waveguide.

[0032] According to an embodiment, the perimeter shoulder is covered by an opaque coating.

[0033] Such an embodiment is particularly advantageous when the optical element is an electrochromic cell. In the example, the electrochromic cell effectively comprises two shells, each supporting a metal strip for electrically connecting the electrochromic cell to a processor. The shells, which are transparent outer layers, are bonded together with beads of glue. Due to the transparency of the wafer or optical element, the metal strip or the beads of glue may be visible. Accordingly, an opaque coating helps to cover the whitish appearance of the outer part of the optical system.

[0034] The opaque coating is prepared from a polyurethane epoxy material deposited on the periphery shoulder, for example using a coating applicator, so that the opaque coating hardly flows or does not flow onto the central front surface of the wafer and the optical element.

[0035] In addition, the present invention relates to a device for eyeglasses, and,

[0036] - At least one optical system as described above, and

[0037] - A frame comprising at least one rim that partially accommodates at least one optical system, wherein the rim is connected to at least one temple.

[0038] Includes

[0039] The inner edge of at least one rim is a groove having a shape complementary to the perimeter shoulder of at least one optical system, and accordingly, the adhesive material of at least one optical system is concealed within the inner edge.

[0040] Finally, the present invention relates to a method for manufacturing the aforementioned optical system. The method comprises the following steps:

[0041] - The step of receiving the wearer's ophthalmological prescription,

[0042] - The step of designing a wafer based on the wearer's ophthalmic prescription and subsequently manufacturing it,

[0043] - A step of processing a wafer to form a perimeter shoulder on the periphery of the wafer, and

[0044] - A step of bonding a wafer and an optical element using an adhesive material.

[0045] Generally, the periphery shoulder forms the periphery section and the center section of the wafer, and the periphery section has an average thickness thinner than the average thickness of the center section. According to an embodiment, the method further comprises the following steps prior to the wafer manufacturing step:

[0046] - Step of calculating the desired minimum average thickness of the circumference section based on the wearer's ophthalmic prescription,

[0047] - A step of predicting the future average thickness of the perimeter section after wafer processing using the wafer design obtained after the design phase, and

[0048] - A step of generating a new wafer design such that, if the predicted future average thickness of the perimeter section is thinner than the desired minimum average thickness, the new future average thickness of the perimeter section determined by the prediction is thicker than the desired minimum average thickness.

[0049] Advantageously, the step of generating a new wafer design is performed iteratively until the predicted future average thickness of the perimeter section becomes equal to the desired minimum average thickness. Effects of the invention

[0050] Included in the contents of the present invention. Brief explanation of the drawing

[0051] Other features and advantages of the present invention will become apparent from the following description, provided for exemplary and non-limiting purposes with reference to the accompanying drawings. FIG. 1 illustrates an optical system according to the present invention. Figure 2a shows a drawing of the rear surface of the wafer of the optical system of Figure 1. Figure 2b shows a drawing of the front surface of the wafer of the optical system of Figure 1. FIG. 2c shows a transparent perspective view of the wafer of FIG. 1. FIG. 2d shows a partial perspective view of the edge of the optical system of FIG. 1, in which the perimeter shoulder of the wafer is covered with an opaque coating. Figure 3 shows the enlarged partial transparency of the soft part of the optical system of Figure 1. FIG. 4 illustrates an eyeglasses device including an optical system according to the present invention. FIG. 5 illustrates a system for manufacturing an optical system according to the present invention. FIG. 6 illustrates a method for manufacturing an optical system according to the present invention. Specific details for implementing the invention

[0052] Fig. 1 It illustrates an optical system (1).

[0053] As described specifically below, advantageously, the optical system (1) is an electrochromic ophthalmic lens intended to be mounted within a glasses frame.

[0054] The optical system includes a wafer (3) and an optical element (5). The wafer (3) and the optical element (5) are bonded to each other by an adhesive material (7).

[0055] FIGS. 2a to 2c Referring to [this], the wafer (3) will be described in more detail below.

[0056] The wafer (3) is configured to provide ophthalmic properties to the optical system (1). Generally, the wafer (3) is designed and manufactured to satisfy the wearer's ophthalmic prescription.

[0057] A wearer's ophthalmic prescription is a set of data, hereinafter referred to as prescription data, determined by a healthcare professional, such as an ophthalmologist. Prescription data includes various information related to the wearer, such as sphere values, cylinder values, prisms, and progressive refractive power (where applicable). Such prescription data is essential for designing and manufacturing ophthalmic lenses intended for the wearer to correct visual impairments or refractive errors, also referred to as amorphysia. For example, when a wearer has presbyopia, the prescription data includes progressive refractive power for manufacturing progressive ophthalmic lenses configured for such amorphysia.

[0058] The wafer (3) is preferably made of a transparent material.

[0059] Fig. 2c As illustrated in the figure, the wafer (3) includes a rear surface (3B) and a front surface (3F) opposite the rear surface (3B).

[0060] As described above, advantageously, the optical system (1) is an electrochromic ophthalmic lens intended to be mounted within a glasses frame.

[0061] In such a case, the rear surface (3B) corresponds to the surface closest to the wearer's eyes when the wearer wears the eyeglass frame. In other words, the rear surface (3B) is the surface of the wafer (3) placed on the wearer's eye side.

[0062] Conversely, the front surface (3F) corresponds to the surface furthest from the wearer's eyes when the wearer wears the eyeglass frame. Also, Fig. 1 As illustrated in [Image], the front surface (3F) is also configured to be bonded to the optical element (5) using an adhesive material (7).

[0063] As described above, the wafer (3) is generally manufactured to satisfy an ophthalmic prescription. To reduce the complexity of manufacturing the wafer (3), it is well known to those skilled in the art that a semi-finished lens, also referred to as a lens blank, is manufactured in advance. A semi-finished lens is a lens in which only one of its surfaces is pre-finished and processed. Generally, the finished lens of the semi-finished lens is the front surface. Subsequently, the semi-finished lens is stored. When an ophthalmic prescription is received, the semi-finished lens best suited to satisfy the acquired ophthalmic prescription is selected, which is sufficient for subsequently processing the rear surface. Accordingly, the rear surface is specified for the wearer and processed according to the prescription data.

[0064] Consequently, in the present invention, the front surface (3F) corresponds to the pre-processed surface of the semi-finished lens used for manufacturing the wafer (3), while the rear surface (3B) corresponds to the rear surface of the semi-finished lens after processing based on prescription data.

[0065] Conversely, the prescription may be provided by the front surface (3F) and not by the rear surface (3B) of the wafer (3).

[0066] Additionally, in the context of the present invention, the wafer (3) has a perimeter shoulder (9).

[0067] Drawing the rear surface (3B) of the wafer (3) Fig. 2a As illustrated in [Figure], the perimeter shoulder (9) is provided on the rear surface (3B) of the wafer. Accordingly, when viewing the wafer from the rear surface (3B), the perimeter shoulder (9) may be visible. Here, Fig. 2a It will be understood that only the rear surface (3B) of the wafer (3) is shown, and accordingly, before mounting it within the eyeglass frame, the perimeter shoulder (9) on the rear surface (3B) of the wafer can be clearly seen.

[0068] Conversely, Fig. 2bThe front surface (3F) of the wafer (3) is shown, and the perimeter shoulder (9) is not visible because it is provided only on the rear surface (3B). Fig. 2b In this case, the perimeter shoulder (9) is indicated accordingly only by dashed lines, whereas, Fig. 2a It is depicted with a solid line. Once again, Fig. 2a This shows only the front surface (3F) of the wafer (3) before mounting inside the glasses frame.

[0069] The perimeter shoulder (9) forms the perimeter section (3P) and the central section (3C) of the wafer (3). The perimeter section (3P) has an average thickness thinner than the average thickness of the central section (3C). Fig. 2c In this case, only the thickness (TH) of the perimeter section (3P) is referenced.

[0070] Fig. 2a As illustrated in [Image], each of the perimeter section (3P) and the central section (3C) includes a rear surface, respectively referred to as the perimeter rear surface (3PB) and the central rear surface (3CB), which are opposite to the optical element (5).

[0071] The perimeter rear surface (3PB) and the central rear surface (3CB) together form the rear surface (3B) of the wafer (3).

[0072] Fig. 2b As illustrated in [Image], each of the perimeter section (3P) and the central section (3C) includes a front surface, respectively referred to as the perimeter front surface (3PF) and the central front surface (3CF), which faces the optical element (5).

[0073] The perimeter front surface (3PF) and the central front surface (3CF) together form the front surface (3F) of the wafer (3).

[0074] As described above, the front surface (3F) of the wafer (3) is configured to be bonded to the optical element (5) using an adhesive material (7). Consequently, since the front surface (3) is formed by a combination of a perimeter front surface (3PF) and a central front surface (3CF) formed by a perimeter shoulder (9), the perimeter front surface (3PF) and / or the central front surface (3CF) are configured to be bonded to the optical element (5) using an adhesive material (7).

[0075] Advantageously, the adhesive material (7) is applied only on the perimeter front surface (3PF). In such a case, the adhesive material (7) is applied on a closed loop along the perimeter front surface (3PF), thereby providing sealing properties and preventing dust or water from penetrating into the air gap.

[0076] According to an embodiment, a portion of the perimeter shoulder (9) has an angled shape, and the perimeter rear surface (3PB) forms a local angle with the central rear surface (3CB). Fig. 2c In the example illustrated, the perimeter rear surface (3PB) and the central rear surface (3CB) form a local right angle.

[0077] Alternatively or additionally, a portion of the perimeter shoulder (9) has a beveled shape. The perimeter rear surface (3PB) is a beveled surface that joins the edge of the perimeter rear surface (3PB) to the central rear surface (3CB).

[0078] Alternatively or additionally, a portion of the perimeter shoulder (9) has a curved shape, and the perimeter rear surface (3PB) is tangential to the central rear surface (3CB) in the vicinity of the central rear surface (3CB).

[0079] The optical element (5) is configured to provide optical properties to the optical system (1) in addition to the ophthalmic properties provided by the wafer (3). Additionally, the optical element (5) may be configured to provide a part of the wearer's ophthalmic prescription so that the combination of the wafer (3) and the optical element (5) satisfies the wearer's ophthalmic prescription.

[0080] Generally, the optical element (5) includes a first surface and a second surface (not referenced in the drawing).

[0081] A first surface of the optical element (5) is configured to be bonded to the wafer (3) using an adhesive material (7). More specifically, the first surface is configured to be bonded only to the front surface (3F) of the wafer (3), and advantageously to the periphery front surface (3PF).

[0082] In other words, the first surface corresponds to the surface closest to the wearer's eye when the wearer wears the eyeglass frame, among the first and second surfaces of the optical element (5).

[0083] Conversely, the second surface opposite the first surface corresponds to the surface furthest from the wearer's eyes when the wearer wears the eyeglass frame.

[0084] According to a preferred embodiment, the optical element (5) includes an electrochromic cell. In such an embodiment, the optical system (1) is an electrochromic ophthalmic lens as described above.

[0085] Electrochromic ophthalmic lenses can be classified as electroactive lenses, that is, lenses whose specific properties can be electronically altered. In particular, the light transmittance of electrochromic ophthalmic lenses can be electronically changed.

[0086] For example, electrochromic ophthalmic lenses are controlled by the wearer or by a healthcare professional, typically an ophthalmologist. Alternatively, light transmittance values ​​can also be changed automatically.

[0087] In an embodiment where the optical element (5) is an electrochromic cell, the electrochromic cell has a structure comprising, for example, two flat transparent outer layers, two surfaces made of, for example, organic or mineral materials, and a transparent electrically conductive coating is deposited on the inner surface thereof. An electrochromic composition fills the cavity formed between the two electrically conductive coatings. Thus, the light transmittance value of the cell can be changed by applying an electric field between the electrically conductive coatings.

[0088] The periphery is bordered at the periphery by a seal formed of a cross-linked adhesive material, and the seal is suitable for supporting two assembled transparent layers.

[0089] An embodiment in which the optical element (5) is an electrochromic cell Fig. 2d As illustrated in [figure]. As previously described, the optical element (5) comprises a first transparent outer layer (2) and a second transparent outer layer (4). In the literature, the two transparent outer layers (2, 4) are generally mineral shells bonded together with beads of glue. In other examples, the layers (2, 4) may be plastic shells.

[0090] Since the optical element (5) is an electrochromic cell that must be electronically controlled, both shells support a silver bus on the soft side. The silver bus takes the form of a metal strip to electrically connect the electrochromic cell to the processor.

[0091] However, due to the transparency of the wafer (3) or the optical element (5), beads of silver bus or glue may be visible. Accordingly, Fig. 2d In the embodiment illustrated in [Image], the perimeter shoulder (9) is covered with an opaque coating (6). The opaque coating (6) Fig. 2dIt is illustrated with a black coating on the perimeter shoulder (9). According to an embodiment, the opaque coating (6) covers only the perimeter rear surface (3PB) of the wafer (3). The opaque coating (6) helps to cover the whitish appearance of the outer part of the optical system (1). Preferably, so as not to block the wearer's watch, the opaque coating (6) does not cover the central rear surface (3CB) of the wafer (3).

[0092] Generally, the opaque coating (6) is made of a polyurethane epoxy material (known by the abbreviation EPU).

[0093] According to an embodiment, the optical element (5) may include an optical waveguide. Generally, in such cases, the first and second surfaces of the optical element (5) are planar surfaces.

[0094] When the optical element (5) includes an optical waveguide, an ophthalmic prescription can be achieved by the combination of the wafer (3) and the optical element (5) because the optical waveguide is a perfect planar optical and planar geometric element. The optical element (5) may also have a non-zero optical refractive power. In this case, the radius of curvature of the rear surface (3B) of the wafer (3) can compensate for the non-zero optical refractive power of the optical element (5).

[0095] As described above, and illustrating the transparency of the enlarged portion of the edge of the optical system (1). Fig. 3 As illustrated in [Image], the wafer (3) and the optical element (5) are bonded to each other by an adhesive material (7). The adhesive material (7) may appear transparent and is expressed in a solid form.

[0096] More specifically, Fig. 3 In the embodiment illustrated in, the adhesive material (7) is provided only on the periphery front surface (3PF) of the wafer (3). Consequently, the adhesive material (7) comes into contact only with the periphery portion of the optical element (5) facing the periphery front surface (3PF).

[0097] The presence of the adhesive material (7) at the periphery of the optical system (1), and more precisely on the periphery front surface (3PF), prevents dust and water from penetrating between the wafer (3) and the optical element (5). The thickness of the adhesive material (7) also allows for an air gap between the wafer (3) and the optical element (5).

[0098] Additionally, in order to maintain an air gap between the wafer (3) and the optical element (5), one or more spacing members may be provided within the adhesive material (7). The spacing members have a rod shape or an "X" shape, for example, which ensures that the distance between the wafer (3) and the optical element (5) is maintained greater than the minimum distance.

[0099] However, advantageously, the average thickness of the adhesive material (7) must still be thinner than the average thickness (TH) of the perimeter section (3P).

[0100] The adhesive material (7) may include glue. Additionally or alternatively, the adhesive material (7) may include rubber.

[0101] As previously specified, the optical system (1) is intended to be mounted within an eyeglass frame. When the optical element (5) is an electrochromic cell, the optical system (1) resulting from the combination of the wafer (3) and the optical element (5) is an electrochromic ophthalmic lens. In such a preferred embodiment, the eyeglass device corresponding to the eyeglass frame in which the electrochromic ophthalmic lens is mounted is configured to electronically change the light transmittance value based on ambient light, light intensity, or the wavelength of the light.

[0102] now Fig. 4 With reference to the above, the eyeglasses device (11) according to the present invention will now be described.

[0103] The eyeglass device (11) is configured to correct a visual impairment or refractive error of the wearer, also referred to as non-amorphous vision. Typically, the wearer has myopia, hyperopia, astigmatism, or presbyopia. The ophthalmic lens fitted to the eyeglass device (11) is designed and manufactured based on the wearer's prescription data.

[0104] Fig. 4 As illustrated in [Image], the eyeglass device (11) comprises a frame (13), and the aforementioned and Fig. 1 It includes at least one optical system (1) as shown in [image].

[0105] The frame (13), or eyeglass frame, is configured to be worn by a wearer and, advantageously, relates to a wearer for whom prescription data is used to manufacture an optical system (1).

[0106] The frame (13) includes at least one rim (15), at least one temple (17), at least one hinge (19), and a processor (21).

[0107] The frame (15) is configured to accommodate at least partially the optical system (1). Generally, the frame (15) includes a holder configured to accommodate and hold the upper portion of the optical system (1), and a cradle configured to surround at least partially the lower portion of the optical system (1).

[0108] Specifically, as described above, the optical system (1) comprises a wafer (3) and an optical element (5), and the wafer (3) and the optical element (5) are bonded to each other by an adhesive material (7). Additionally, in the context of the present invention, the wafer (3) has a perimeter shoulder (9).

[0109] Consequently, the inner edge of the edge (15) is a groove having a shape complementary to the perimeter shoulder (9) of the optical system (1). The adhesive material (7) provided between the wafer (3) and the optical element (5), and more particularly between the front surface (3F) of the wafer (3) and the first surface of the optical element (5), is accordingly concealed within the inner edge of the edge (15).

[0110] The complementary shape of the groove of the edge (15) conceals the layer of adhesive material (7) and securely maintains the optical system (1).

[0111] Fig. 4 In the example illustrated in, the frame (13) includes two borders (15), each border accommodating at least partially the optical system (1).

[0112] likewise, Fig. 4 The frame (13) shown includes two temples (17).

[0113] Each temple (17) is connected to an end of the frame (15) by a hinge (19). More precisely, one temple (17) is connected to an end of the frame (15), while the other temple (17) is connected to an end of the other frame (15).

[0114] In order to ensure the stability of the eyeglass device (11) when it is worn by a wearer, the temples (17) are configured to be positioned at the wearer's ears. The hinge (19) allows the temples (17) to be unfolded when the wearer wants to wear the eyeglass device (11), and allows the temples (17) to be folded when the wearer removes the eyeglass device (11).

[0115] Finally, the processor (21) is configured to electronically control the optical system (1) and change its specific characteristics. In particular, when the optical system (1) includes an electrochromic cell, the processor (21) is configured to change the light transmittance value. Thus, the processor (21) enables the eyeglass device (11) to be configured to match ambient light.

[0116] To this end, the eyeglass device (11) may include a sensor positioned to measure specific parameters of the environment, such as the intensity of light or the wavelength of light. Then, the light transmittance value is changed using the measurement of the sensor and configured to match the ambient light.

[0117] It is known to those skilled in the art that a sensor may be placed at several locations on the frame (13). For example, the sensor may be placed on the outer side of the frame (13) to measure the intensity of light incident on the ophthalmic lens. The sensor may also be located on the inner side of the frame (13) to measure the intensity of light passing through the ophthalmic lens. The sensor may also be a camera directed toward the wearer's eye to determine in real time the intensity of light received by the wearer's eye according to the pupil size.

[0118] The measurement can be transmitted directly to the processor (21). Subsequently, the processor (21) determines a light transmittance value configured to match the ambient light using a computer program stored in memory. Alternatively, the measurement can be transmitted to a remote device, such as a medical device, so that a wearer or healthcare professional can determine an appropriate light transmittance value. Subsequently, these values ​​are transmitted to the processor (21) to control the optical system (1) accordingly.

[0119] now, Fig. 5 and Fig. 6 With reference to the above, the manufacturing system and method of the optical system (1) described above will be explained respectively.

[0120] The system (23) Fig. 5 It is depicted in.

[0121] The system (23) is configured to manufacture an optical system (1) based on the wearer's prescription data.

[0122] The system (23) includes an order side (25), a design side (27), and a manufacturing side (29).

[0123] The ordering side (29) is configured to generate an ophthalmic prescription to correct an individual's visual impairment or refractive error. The ophthalmic prescription is made by a healthcare professional, typically an ophthalmologist, for the manufacture of an eyeglass device configured to fit the individual.

[0124] An ophthalmic prescription is a set of prescription data calculated at the ordering side (29) level based on measurements taken, for example, during an individual's eye examination or vision test. The prescription data includes various information related to the individual, such as sphere values, cylinder values, prism and progressive refractive power (if applicable).

[0125] Once the prescription data is generated, the ordering side (29) transmits the ophthalmic prescription to the design side (27).

[0126] Consequently, Fig. 6 In step (S1) of the method described in the example, the design side (27) receives the wearer's ophthalmic prescription.

[0127] The design side (27) is configured to generate a design of the wafer (3) of the optical system (1) based on the received ophthalmic prescription of the wearer.

[0128] Fig. 5 As illustrated in [Image], the lens design unit (27) includes a communication module (31), a calculation unit (33), and a database (35).

[0129] The communication module (31) is configured to communicate with the ordering side (25). More specifically, as described above, the communication module (31) is configured to receive an ophthalmic prescription generated and transmitted by the ordering side (25).

[0130] Additionally, the communication module (31) is also configured to communicate with the manufacturing side (29) of the system (23).

[0131] As described above, the optical system (1) of the present invention includes a wafer (3) and an optical element (5). The wafer (3) and the optical element (5) are bonded to each other by an adhesive material (7).

[0132] Here, the calculation unit (33) is configured to design the wafer (3) of the optical system (1) accordingly.

[0133] Additionally, in the context of the present invention, the wafer (3) of the optical system (1) has a perimeter shoulder (9). The perimeter shoulder (9) forms a perimeter section (3P) and a central section (3C) of the wafer (3), and the average thickness (TH) of the perimeter section (3P) is thinner than the average thickness of the central section (3C).

[0134] Consequently, according to the embodiment, the calculation unit (33) also determines the desired minimum average thickness (TH) of the perimeter section (3P) of the wafer (3) based on the wearer's ophthalmic prescription received by the communication module (31). min It can be configured to calculate ).

[0135] Accordingly, in step (S2) of the method, the calculation unit (33) determines the desired minimum average thickness (TH) of the circumference section (3P) based on the wearer's ophthalmic prescription. min Calculate ).

[0136] Generally, the desired minimum average thickness (TH) of the perimeter section (3P) min ) is about 0.4 mm.

[0137] However, desired minimum average thickness (TH min ) may vary depending on the wearer's prescription data. Minimum average thickness (TH min Adjustment of ) enables better stability of the curvature of the front surface (3F) of the wafer (3) and reduces the risk of cracking or crazing.

[0138] In step (S3), the calculation unit (33) generates a design of the wafer (3) based on the wearer's ophthalmic prescription received by the communication module (31). In effect, the wafer (3) is intended to satisfy the received ophthalmic prescription. Step (S3) involves the desired minimum average thickness (TH) of the perimeter section (3P). min It can be performed before, in parallel with, or after the step (S2) of calculating ).

[0139] More specifically, regarding the creation of the wafer (3) design performed during step (S3), it is well known to those skilled in the art that a semi-finished lens, also referred to as a lens blank, is manufactured in advance to reduce the complexity of wafer (3) manufacturing. The semi-finished lens is a lens in which only one of its surfaces is pre-finished and processed. Generally, the finished lens of the semi-finished lens is the front surface, and it is sufficient to then process the rear surface specific to the wearer.

[0140] In such cases, the calculation unit (33) selects the most suitable semi-finished lens that satisfies the ophthalmic prescription when the wearer's ophthalmic prescription is received. Available pre-manufactured semi-finished lenses are listed and referenced in a database, for example, database (35), and the calculation unit (33) can access them accordingly.

[0141] After selecting the most suitable semi-finished lens based on the prescription data, the calculation unit (33) calculates the design for the unfinished surface of the semi-finished lens. Accordingly, the calculation unit (33) considers the selected semi-finished lens to generate the design of the prescription data and the wafer (3). In particular, the design of the unfinished surface is calculated such that the combination of the pre-processed surface and the unfinished surface satisfies the ophthalmic prescription after surface treatment.

[0142] In the present invention, it can be considered that the front surface (3F) corresponds to the pre-processed surface of the semi-finished lens used for manufacturing the wafer (3), while the rear surface (3B) corresponds to the rear surface of the semi-finished lens after processing.

[0143] Additionally, in the context of the present invention, the wafer (3) is intended to be coupled to the optical element (5) after manufacturing and processing. Consequently, depending on the embodiment, the design generated by the calculation unit (33) also depends on the optical element (5).

[0144] For example, when the optical element (5) includes an optical waveguide, the wafer (3) can be designed so that the wearer's prescription data is derived from the combination of the wafer (3) and the optical element (5). In particular, the radius of curvature of the rear surface (3B) of the wafer (3) can compensate for the non-zero optical refractive power of the optical element (5).

[0145] Generally, regardless of what the optical element (5) is, whether the optical element includes an electrochromic cell or an optical waveguide, it is desirable that the radius of curvature of a portion of the front surface (3F) of the wafer (3) be substantially the same as the radius of curvature of the corresponding facing portion of the first surface of the optical element (5). Accordingly, when the optical element (5) is selected before the design of the wafer (3) is created, the semi-finished lens is selected by the calculation unit (33) according to the prescription data as well as according to the radius of curvature of the optical element (5) and the portion of the first surface of the optical element (5).

[0146] For example, the front surface (3F) of the wafer (3) is spherical, and the rear surface of the optical element (5) is also spherical with the same curvature. This allows the front surface (3F) of the wafer (3) to be independent of the shape or formulation of the frame while maintaining a minimum distance between the front surface (3F) of the wafer (3) and the corresponding surface of the optical element (5). Thus, it is advantageous to manufacture a stock of wafers having a spherical front surface. Subsequently, it is sufficient to accurately position the optical center of the wafer (3) relative to the frame and to create a perimeter shoulder (9) with a grinder.

[0147] The calculation unit (33) may be additionally configured to predict the future average thickness of the perimeter section (3P) after processing the wafer (3) using the design of the wafer (3).

[0148] Accordingly, in step (S4) of the method, the calculation unit (33) predicts the future average thickness of the perimeter section (3P) after processing the wafer (3) using the design of the wafer (3) obtained after the design step (S3).

[0149] In other words, the computational unit (33) uses computer means to simulate the manufacturing of the wafer (3) based on the design obtained in step (S3). Subsequently, the computational unit (33) simulates the processing of the wafer (3) to predict the future average thickness of the perimeter section (3P).

[0150] At the end of step (S4), the calculation unit (33) accordingly determines the desired minimum average thickness (TH min Determines the predicted future average thickness of the ) and perimeter section (3P).

[0151] The calculation unit (33) can be configured to compare these two thickness values.

[0152] In step (S5), the calculation unit (33) calculates the minimum average thickness (TH min Compare the future average thickness of the ) and the perimeter section (3P).

[0153] The predicted future average thickness of the perimeter section (3P) is the desired minimum average thickness (TH min In the case where it is thinner than ), the new future average thickness of the perimeter section (3P) determined by prediction is the desired minimum average thickness (TH min To make it thicker than ), the calculation unit (33) generates a new design of the wafer (3).

[0154] In other words, and Fig. 6 As illustrated in [Figure], the predicted future average thickness of the perimeter section (3P) is the desired minimum average thickness (TH min If it is thinner than ), steps (S3 and S4) are performed again.

[0155] For example, another semi-finished lens is selected from the database (35). Alternatively or additionally, the computation unit (33) generates a new design for the unfinished surface of the selected semi-finished lens by using a different algorithm. Another possibility is to simulate the processing of the perimeter shoulder (9) in a different way so that the future average thickness of the new perimeter section (3P) is thicker than the average thickness of the previous simulation.

[0156] In particular, this idea is to locally increase the thickness of the wafer (3), especially on the soft side, in the design created so that the perimeter shoulder (9) can be subsequently processed.

[0157] When a new design of the wafer (3) is created and a step of predicting the future average thickness of the new perimeter section (3P) is performed, step (S5) is performed again to verify whether the standard for the average thickness has been verified, i.e., whether the predicted future average thickness of the perimeter section (3P) is the desired minimum average thickness (TH min Determines whether it is ) or more.

[0158] Advantageously, the calculation unit (33) calculates that the predicted future average thickness of the perimeter section (3P) is the desired minimum average thickness (THmin A new design of the wafer (3) is created by continuous repetition until it becomes identical to ).

[0159] Minimizing the thickness (TH) of the perimeter section (3P) allows for a local reduction in the thickness of the wafer (3) and, accordingly, the optical system (1).

[0160] Fig. 5 As illustrated in [Image], the computation unit (33) includes memory (37) and a processor (39).

[0161] The memory (37) is configured to store various programs necessary for the operation of the computation unit (33). In particular, in the context of the present invention, the memory (37) is configured to store a computer program including instructions, and the execution of instructions by the processor (39) enables the design of the wafer (3) to be performed.

[0162] Finally, the database (35) is configured to store information that the computing unit (33) can access and that enables the computing unit (33) to generate a design of the wafer (3) based on the prescription data. For example, as described above, the database (35) stores data regarding semi-finished lenses, more specifically data regarding the characteristics of the pre-processed surface of each semi-finished lens.

[0163] The database (35) can be accessed by the calculation unit (33) by one or more inputs. For example, the database (35) provides answers regarding one or more semi-finished lenses in response to input prescription data. Generally, at least one semi-finished lens corresponds to the association of the sphere value and the cylinder value.

[0164] Additionally, the database (35) may be configured to store data related to the optical element (5). Consequently, the computational unit (33) may select the optical element (5) intended to be bonded to the wafer (3) after manufacturing and processing, before the creation of the design in step (S3). In fact, as previously described, the radius of curvature of the front surface (3F) or the rear surface (3B) may vary depending on the radius of curvature of the first surface or the second surface of the optical element (5).

[0165] After the design of the wafer (3) is created, the design side (27) transmits the created design to the manufacturing side (29). The created design is transmitted, for example, by a communication module (31).

[0166] The manufacturing side (29) is configured to manufacture an optical system (1) based on the design of the wafer (3) that is created and transmitted by the communication module (31) of the design side (27).

[0167] In step (S6), the wafer (3) is manufactured at the manufacturing side (29) based on a design received from the design side (27) and generated by the calculation unit (33).

[0168] More specifically, as described above, a semi-finished lens selected from the database (35) by the calculation unit (33) is acquired at the manufacturing side (29). The semi-finished lens is stored, for example, in a physical lens blank storage. Accordingly, the semi-finished lens includes a pre-processed surface and an unfinished surface intended to be surface-treated.

[0169] The manufacturing side (29) is configured to surface-treat the unfinished surface of the semi-finished lens, and accordingly, the unfinished surface corresponds to a design created to satisfy the wearer's ophthalmic prescription created by the ordering side (25) after processing. Generally, the unfinished surface to be surfaced is the rear surface of the semi-finished lens.

[0170] The manufacturing side (29) also includes devices and tools for blocking, cribbing, surface treatment, polishing, and all other operations necessary to manufacture a wafer (3) that satisfies the prescription. Starting from a semi-finished lens obtained from a physical lens blank storage, the necessary operations are performed to surface-treat the rear surface of the semi-finished lens, thereby obtaining a desired wafer (3) that follows the design transmitted by the design side (27).

[0171] Next, in step (S7), the wafer (3) is processed to form a periphery shoulder (9) at the periphery of the wafer (3).

[0172] Specifically, as described above, the perimeter shoulder (9) can have various shapes.

[0173] For example, a portion of the perimeter shoulder (9) has an angular shape, and the perimeter rear surface (3PB) forms a local angle with the central rear surface (3CB). Such an embodiment Fig. 2c As shown in the figure, the perimeter rear surface (3PB) and the central rear surface (3CB) form a local right angle.

[0174] Alternatively or additionally, a portion of the perimeter shoulder (9) has a beveled shape. The perimeter rear surface (3PB) is a beveled surface that joins the edge of the perimeter rear surface (3PB) to the central rear surface (3CB).

[0175] Alternatively or additionally, a portion of the perimeter shoulder (9) has a curved shape, and the perimeter rear surface (3PB) is tangential to the central rear surface (3CB) in the vicinity of the central rear surface (3CB).

[0176] Additionally, according to an embodiment, the average thickness (TH) of the perimeter section (3P) is the desired minimum average thickness (TH) calculated by the calculation unit (33) in step (S2). min) is greater than. Advantageously, the average thickness (TH) of the perimeter section (3P) is the desired minimum average thickness (TH min It is the same as ).

[0177] Additionally, at the end of step (S7), the perimeter shoulder (9) may be further covered by an opaque coating (6). This embodiment Fig. 2d As illustrated in [Image]. The opaque coating (6) is particularly useful when the optical element (5) is an electrochromic cell comprising a first shell (2) and a second shell (4) bonded together by beads of glue. In this case, the opaque coating (6) allows both the beads of glue and the electrical connections on the edges of the shells (2, 4) to be covered.

[0178] The opaque coating (6) is deposited onto the perimeter shoulder (9) using, for example, a coating applicator in which the barrel is filled with an EPU (epoxy polyurethane) coating. Then, the opaque coating (6) is carefully deposited onto the perimeter shoulder (9) using an applicator head so that the opaque coating (6) does not flow or flow onto the central front surface (3CF) of the wafer (3) and the optical element (5). Any excess opaque coating (6) can be removed with blue tape after the opaque coating (6) has cured on the perimeter shoulder (9).

[0179] finally, Fig. 6 In step (S8) of the method described above, the wafer (3) and the optical element (5) are joined together using an adhesive material (7). As previously described, the optical element (5) can be selected from the database (35) by the computational unit (33). In fact, the optical element (5) may have an eye and characteristics that are considered for the creation of the design of the wafer (3).

[0180] An optical element (5) is added to the wafer (3) to provide optical properties to the optical system (1) in addition to the ophthalmic properties provided by the wafer (3).

[0181] More specifically, the first surface of the optical element (5) is bonded to the front surface (3F) of the wafer (3) using an adhesive material (7). Advantageously, Fig. 3 As illustrated in [Image], the first surface of the optical element (5) is bonded to the periphery front surface (3PF) of the wafer (3).

[0182] According to a preferred embodiment, the optical element (5) includes an electrochromic cell. In such an embodiment, the optical system (1) is an electrochromic ophthalmic lens, and the light transmittance of the electrochromic ophthalmic lens can be changed electronically.

[0183] According to an embodiment, the optical element (5) includes an optical waveguide. In such a case, the first and second surfaces of the optical element (5) are planar surfaces.

[0184] Fig. 3 As illustrated in [Image], the adhesive material (7) is provided only on the periphery front surface (3PF) of the wafer (3). At the end of step (S8), the adhesive material (7) is in contact only with the periphery portion of the optical element (5) that is accordingly facing the periphery front surface (3PF).

[0185] Additionally, during step (S8), one or more spacing members may be provided within the adhesive material (7) to maintain an air gap between the wafer (3) and the optical element (5).

[0186] Advantageously, the average thickness of the adhesive material (7) is thinner than the average thickness (TH) of the perimeter section (3P).

[0187] For example, the adhesive material (7) includes glue and / or rubber.

[0188] The present invention has several advantages.

[0189] Above all, the perimeter shoulder processed on the wafer conceals the layer of adhesive material and prevents the exposure of this layer after the optical system is mounted within the eyeglass frame. In particular, a groove having a shape complementary to the perimeter shoulder conceals the layer of adhesive material and securely holds the optical system within the rim of the eyeglass frame.

[0190] In addition, applying the adhesive material only to the periphery of the optical system, and more precisely to the front surface around the wafer, prevents dust and water from penetrating between the wafer and the optical element. An air gap between the wafer and the optical element can be maintained by one or more spacing members placed within the adhesive material.

[0191] Finally, minimizing the thickness of the perimeter section enables a local reduction in the thickness of the wafer and, consequently, the optical system. Calculations of the wafer design through successive iterations advantageously allow for the minimization of the thickness of the wafer's perimeter section.

Claims

Claim 1 An optical system (1) comprising a wafer (3) and an optical element (5), wherein the wafer and the optical element are bonded to each other by an adhesive material (7), wherein the wafer has a perimeter shoulder (9), wherein the perimeter shoulder forms a perimeter section (3P) and a central section (3C) of the wafer, wherein the perimeter section has an average thickness (TH) thinner than the average thickness of the central section, wherein each of the perimeter section and the central section includes a front surface, respectively referred to as a perimeter front surface (3PF) and a central front surface (3CF), which faces the optical element, wherein the perimeter front surface and the central front surface together form a front surface (3F) of the wafer, and wherein the adhesive material is provided only on the perimeter front surface. Claim 2 An optical system according to claim 1, wherein the average thickness of the perimeter section is thicker than the average thickness of the adhesive material between the wafer and the optical element. Claim 3 An optical system according to claim 1, wherein the radius of curvature of a portion of the front surface of the wafer is substantially the same as the radius of curvature of a corresponding facing portion of the surface of the optical element. Claim 4 An optical system according to claim 1, wherein each of the perimeter section and the central section comprises a rear surface, each referred to as a perimeter rear surface (3PB) and a central rear surface (3CB), and the perimeter rear surface and the central rear surface are respectively opposed to a perimeter front surface and a central front surface, and the perimeter rear surface and the central rear surface together form a rear surface (3B) of the wafer. Claim 5 An optical system according to paragraph 4, wherein a portion of the perimeter shoulder has an angular shape, and the perimeter rear surface locally forms an angle with the central rear surface. Claim 6 An optical system according to claim 4, wherein a portion of the perimeter shoulder has a beveled shape, and the perimeter rear surface is a beveled surface that joins the edge of the perimeter rear surface to the central rear surface. Claim 7 An optical system according to paragraph 4, wherein a portion of the perimeter shoulder has a curved shape, and the perimeter rear surface is tangential to the central rear surface at a proximity to the central rear surface. Claim 8 An optical system according to claim 1, wherein the adhesive material comprises glue, rubber, or a combination thereof. Claim 9 An optical system according to claim 1, wherein the optical system further comprises a spacing member within the adhesive material to maintain an air gap between the wafer and the optical element. Claim 10 An optical system according to claim 1, wherein the wafer comprises a rear surface designed and surface-treated according to the wearer's ophthalmic prescription, and a front surface facing the rear surface and intended to be bonded to the optical element. Claim 11 An optical system according to claim 1, wherein the optical element comprises an electrochromic cell. Claim 12 An optical system according to claim 1, wherein the optical element includes an optical waveguide. Claim 13 An optical system according to claim 1, wherein the perimeter shoulder is covered by an opaque coating (6). Claim 14 A glasses device (11), comprising: at least one optical system (1) according to any one of claims 1 to 13; and a frame (13) comprising at least one rim (15) that at least partially accommodates the at least one optical system, wherein the rim is connected to at least one temple (17) by a hinge (19), and the inner edge of the at least one rim is a groove having a shape complementary to the perimeter shoulder (9) of the at least one optical system, and accordingly, the adhesive material (7) of the at least one optical system is concealed within the inner edge. Claim 15 A method for manufacturing an optical system (1) according to any one of claims 1 to 13, comprising: receiving an ophthalmic prescription of a wearer (S1); designing a wafer (3) based on the wearer's ophthalmic prescription (S3) and manufacturing it (S6); processing the wafer to form a periphery shoulder (9) on the periphery of the wafer (S7); and bonding the wafer and the optical element (5) using an adhesive material (7) (S8). Claim 16 In paragraph 15, prior to the manufacturing step of the wafer, the following step: - the desired minimum average thickness (TH) of the perimeter section based on the ophthalmic prescription of the wearer min A method further comprising: a step of calculating (S2); a step of predicting the future average thickness of the periphery section after wafer processing using the wafer design obtained after the design step (S4); and a step of comparing the predicted future average thickness with the desired minimum average thickness, and if the predicted future average thickness of the periphery section is thinner than the desired minimum average thickness, generating a new design of the wafer such that the new future average thickness of the periphery section determined by the prescription is thicker than the desired minimum average thickness (S5). Claim 17 In claim 16, the step of generating a new design of the wafer is performed repeatedly until the predicted future average thickness of the periphery section becomes equal to the desired minimum average thickness. Claim 18 delete Claim 19 delete Claim 20 delete

Images