A spiral diopter with meridians of different optical powers

Abstract

Spiral diopter with different meridians of optical power. The present invention relates to an optical device (100, 200, 400, 800) having an optical axis, comprising at least one surface having at least two meridians, at least one portion of which, in front view, forms at least one helical segment with a center point (206, 406, 806) on the optical axis, each helical segment defining a meridian of different optical power such that the resulting focal point extends over a tubular area.

Description

Technical Field

[0001] (Technical Field) The present invention relates to the field of optical devices that form a dioptric interface. Although it is described with respect to applications to ophthalmic lenses, the present invention applies to any spherical or toric, dioptric interface, and any dioptric interface whose surface has at least two meridians, which can be used for image formation and / or optical power distribution and / or vision correction.

[0002] Thus, the optical device according to the present invention may be an optical lens of an optical system, an ophthalmic lens, a rigid or soft contact lens, a part of a photographic objective lens, a part of a motion detector, or a device that concentrates light energy.

[0003] Generally, the present invention can be applied to any application where light is focused in the visible or invisible region.

Background Art

[0004] (Prior Art) For a lens, for example, an ophthalmic lens, two opposing optical surfaces (referred to as dioptric interfaces) are connected by an end surface inscribed in the base of a cylinder.

[0005] Currently, optical surfaces are generally classified into the following four categories: - Spherical dioptric interfaces, where the surface is part of the inner or outer surface of a sphere; - Aspherical dioptric interfaces, derived from a sphere, whose surface is part of a surface of revolution and whose curvature changes continuously from the apex towards the periphery; - Toric dioptric interfaces, having two principal meridians with unequal curvatures on the surface, and the cross-sections along these two meridians being nominally circular; - An atoriic dioptric interface having two principal meridians on its surface that are perpendicular to each other and have unequal curvature, with at least one of the principal meridians having a non-circular cross-section.

[0006] The focal point of a spherical lens, formed by the coupling of two spherical dioptric interfaces, has a single focal length to a point called the image focal point. This point-wise focusing is a characteristic of so-called "aberration-free" optical systems. Referring to Figure 1, one can recall the well-known principle of astigmatism (absence of one-point aberration obtained with a spherical lens) caused by an optical lens having a toric surface 1.

[0007] The toric surface 1 has a first meridian 2 that is curved with a first curvature C1 around the axis of rotation of a torus (not shown), and the first meridian 2 forms an arc of a first circle defined by the outer radius of the torus. Furthermore, the toric surface 1 has a second meridian 3, which is perpendicular to the first meridian 1 and curves with a second curvature C2 greater than the first curvature, with a center of curvature (indicated by reference symbol AA) located on the radius of a torus passing through the center of the first meridian 2. Axis AA is the optical axis of the toric surface. The lens is formed from an optical material with refractive index n such that light passing through the toric surface 1 is refracted.

[0008] Specifically, under parallel illumination, light passing through the first meridian 2 converges at the first focal length 4, forming a section 5 parallel to the first meridian 2, and light passing through the second meridian 3 converges at the second focal length 6, forming a section 7 parallel to the second meridian 3.

[0009] Toric lens 1 has two dioptric powers D1 and D2, given by the following relationship: D1=(n-1)C1, D2=(n-1)C2

[0010] U.S. Patent U.S.-A-5198844 discloses a multifocal lens divided into multiple alternating sections having at least two different refractive powers. In one embodiment, the boundary between consecutive sections is an arc starting from the center of the lens. The lens consists only of spherical or aspherical sections, and these sections further have ridge-like surface junctions.

[0011] Generally, there is a need to improve spherical, so-called aberration-free optical devices to lengthen the focal region.

[0012] One of the objectives of this invention is to satisfy this need at least partially. [Overview of the Initiative] [Means for solving the problem]

[0013] (Disclosure of the present invention) To achieve this, the present invention relates to an optical device having an optical axis in one aspect, having at least one surface having at least two meridians, at least one portion of which, when viewed from the front, forms at least one helical segment whose center point lies on the optical axis, each helical segment defining a meridian of different optical powers, and the focal point is not merely an aberration-free single point, but extends over a tubular region extending along the optical axis.

[0014] "Viewed from the front" here, and in the context of this invention, means viewing the device along the optical axis. In other words, it is a matter of how it appears when projected onto a plane perpendicular to the optical axis.

[0015] For clarity, the helical surface portion is defined by projecting it onto a plane perpendicular to the optical axis. The helical segment according to the present invention unfolds into a three-dimensional surface, and therefore this is a helical problem.

[0016] Therefore, the present invention is essentially to generate a helical surface from the surface of a dioptric interface having two or more meridians, that is, a surface having at least one helical segment, i.e., a surface that is helical when projected onto a plane perpendicular to the optical axis.

[0017] In other words, the present invention essentially generates a dioptric interface having a helical surface with two meridians.

[0018] In a sense, if a plane containing two or more meridians is flexible, it will twist and deform along one or more spiral curves. This helication can also be applied to dioptric interface surfaces of aspherical surfaces having two or more meridians.

[0019] The helication is preferably performed on a toric surface, and more preferably on an optical device having two concentric ring bodies with opposing meridians, i.e., at 90° to each other.

[0020] In the case of a toric surface, this results in light being distributed to a first focal length via the curvature of the first meridian and to a second focal length via the curvature of the second meridian. On the other hand, the helicalization of the astigmatism axis forms a helical focal light tube, resulting in the effect of increasing the focal length of the dioptric interface.

[0021] The helical segments according to the present invention can have different shapes, for example, according to linear laws, quadratic laws, or substantially logarithmic laws. These various laws may be combined on the same plane of an optical device. For example, a lens can be obtained in which the first annular segment of the lens has a logarithmic law, and the second annular segment surrounding the first annular segment of the lens has a quadratic or linear law.

[0022] The spiral segment according to the present invention may be formed only on a part of the dioptric interface. Therefore, it may be formed only on the central part, the joint between two independent surfaces (for example, two toric surfaces), or the peripheral part.

[0023] The tubular focus obtained by the present invention is a focus that maintains the same state over a long focal length range and is inscribed in a tube.

[0024] The present invention has many advantages, including the following. - In any optical image forming system such as a photographic objective lens, a camera, a projector objective lens, a virtual reality headset, etc., the need for focus adjustment can be reduced. - For example, by removing the currently adopted electric focusing device, the size of the optical image forming system can be reduced. - It can be used in systems that concentrate light power, such as a solar heating system and a laser cutting device. For example, in a laser cutting device, the tubular focus can increase the length of the focal region along the optical axis, and as a result, the thickness that can be cut can be increased. - It can be used in optical detection systems such as an infrared motion detector and a physical measurement system. The length of the sharp region by the tubular focus advantageously reduces the need for focus adjustment. - In the application to vision correction, the tubular focus can generate a sharp region in a long focal length range. For example, a single ophthalmic lens can ensure near and far vision and optically correct presbyopia and many refractive abnormalities. Thus, one ophthalmic lens can be used for multiple refractive abnormality values. Also, the tubular focus can improve the focus of light rays deviated from the optical axis and improve the visual field. This can be particularly utilized in ophthalmic lenses. An optical lens having one surface generated by the spiralization according to the present invention can particularly extend a severe focal length.

[0025] Generally, optical devices embodying the present invention can be used, for example, in image-forming applications such as photography, videography, optical detection, and vision correction, as well as in other applications requiring focus.

[0026] Optical devices, especially lenses, can be made from any optical material, such as optical glass or polymers.

[0027] One or more helical segments according to the present invention can be manufactured using machining, additive manufacturing, or molding techniques, or a combination of these techniques.

[0028] According to one advantageous embodiment, one or more helical segments are generated from a toric surface having a first meridian curved with a first non-zero curvature and a second meridian curved with a second curvature strictly greater than the first curvature, wherein the second meridian is perpendicular to the first meridian.

[0029] According to this embodiment and advantageous variant embodiments, one or more helical segments are generated from first and second toric surfaces, the first toric surface having a first meridian curved with a first non-zero curvature about the axis of rotation of the first torus and a second meridian curved with a second curvature strictly greater than the first curvature, the second meridian being perpendicular to the first meridian, the second toric surface having a first meridian curved with a first non-zero curvature about the axis of rotation of the second torus and a second curvature strictly greater than the first curvature The first and second toric planes are curved with curvature and have a second meridian perpendicular to the first meridian of the second toric plane, each having multiple azimuth sectors centered on the optical axis, the first meridian of the first toric plane and the first meridian of the second toric plane having azimuth directions separated by a non-zero angle with respect to the optical axis, and the helical segments define the first and second optical power meridians arising from the first meridian of the first toric plane and the first meridian of the second toric plane.

[0030] According to one modified embodiment, the azimuthal sector of a first toric plane and the azimuthal sector of a second toric plane are adjacent via a helical segment end.

[0031] The first toric surface and the second toric surface may each have two azimuthal sectors that are opposite to each other in the diametrical direction.

[0032] Each angular sector of the first toric surface may be adjacent to two angular sectors of the second toric surface.

[0033] According to one favorable feature, the angle between the azimuthal directions of the first meridian of the first toric surface and the first meridian of the second toric surface is between 60° and 90°.

[0034] Preferably, the first curvature of the first toric surface is equal to the first curvature of the second toric surface.

[0035] More preferably, the second curvature of the first toric surface is equal to the second curvature of the second toric surface.

[0036] According to one modified embodiment, the radius of the helical segment is related to the angle of the helix in polar coordinates by linear, quadratic, or logarithmic laws. According to another embodiment, the optical device further has a spherical surface centered on the optical axis.

[0037] The optical device according to the present invention can advantageously form an optical lens having a front surface with at least one helical segment.

[0038] Another subject of the present invention is the use of optical devices as described above for correcting vision, concentrating light-emitting power, and / or forming images. [Brief explanation of the drawing]

[0039] Other advantages and features of the present invention will become clearer upon reading the detailed but non-limiting description of embodiments of the present invention, which will be described with reference to the following figures. [Figure 1] Figure 1 is a schematic diagram showing the distribution of parallel light passing through a toric optical lens. [Figure 2] Figure 2 is a schematic front view showing a first embodiment of a tubular focus optical lens. [Figure 3] Figure 3 is a schematic front view of a multifocal optical lens having two toric surfaces facing each other in the axial direction. [Figure 4] Figure 4 is a schematic perspective view of the multifocal optical lens shown in Figure 3. [Figure 5] Figure 5 is a schematic diagram showing the distribution of parallel light that has passed through the optical lenses shown in Figures 3 and 4. [Figure 6] Figure 6 is a schematic front view of one embodiment of a multifocal optical lens having two toric surfaces facing each other in the axial direction. [Figure 7] Figure 7 is a schematic front view of one embodiment of the tubular focus lens according to the present invention, generated from the lens shape of Figure 6. [Figure 8] Figure 8 is a schematic front view of another embodiment of a multifocal optical lens having two toric surfaces facing each other in the axial direction. [Figure 9] Figure 9 is a schematic front view of another embodiment of the tubular focus lens according to the present invention, generated from the lens shape of Figure 8. [Figure 10] Figure 10 is a schematic profile diagram showing the distribution of a parallel light beam that has passed through the optical lens according to the present invention, compared with a spherical optical lens according to the prior art. [Figure 11] Figure 11 is a schematic perspective view of a beam of parallel light rays passing through an optical lens according to the present invention having a logarithmic spiral, and Figure 11 shows the tubular region at the focus of the light rays. [Figure 12] Figure 12 is an enlarged view of the light ray focusing tube in Figure 11, and is compared with the focal region of a lens with axially opposed toric surfaces shown in Figure 6. [Figure 13]Figure 13 is a front view showing a modified embodiment of a tubular focus lens according to the present invention, having a spherical central portion and a spiral peripheral portion. [Figure 14] Figure 14 is a front view showing another modified embodiment of the tubular focus lens according to the present invention, having two toric surfaces and a helical joint between them. [Modes for carrying out the invention]

[0040] (Detailed explanation) Figure 1, which relates to prior art, has already been explained in the preamble. Therefore, it will not be explained in detail below.

[0041] The following figures show some examples of optical lenses according to the present invention, comprising a plane having two or more meridians, each having at least one helical segment, which generates a focus extending into a tubular region.

[0042] As can be seen from various diagrams, helical segments can be generated in various ways, for example, according to linear, quadratic, or substantially logarithmic laws. These various laws may be combined within the same lens; for example, the first annular segment of the lens may have a logarithmic law, while the second annular segment of the lens surrounding the first annular segment may have a quadratic or linear law.

[0043] Some optical devices may have multiple helical segments. Figure 2 shows an optical lens 800 of a tubular focus according to a first embodiment of the present invention. The representation used is shown by contrast, where distance in the direction perpendicular to the plane of the figure is indicated by contrast, with darker areas indicating further from the reader and brighter areas indicating closer to the reader. As shown in Figure 1, the optical lens 800 is produced by the helication of the toric surface of the lens. The center point is 806. Thus, the shape of the surface 801 has a helix with its center point 806 on the optical axis. In polar coordinates, the angle of the helix increases with radial distance from the optical axis. In particular, the first meridian 802 having a first curvature further has a helical shape centered on the optical axis. Furthermore, in the toric lens of Figure 1, the line 803 having a second curvature and parallel to the second meridian has a different azimuthal direction, and the direction of the line changes with distance from the optical axis due to the helication.

[0044] In fact, in order to realize the present invention, after analyzing the shortcomings of prior art multifocal lenses, the inventors explored extending the focal area along the optical axis.

[0045] We started with a multifocal lens having two concentric toric surfaces and considered aligning them axially.

[0046] Figures 3 and 4 are a front view and a perspective view of such a multifocal optical lens 100. The multifocal optical lens 100 comprises a first toric surface 102 and a second toric surface 104 that concentrically surrounds the first surface 102.

[0047] Therefore, when the lens 100 is viewed axially along the optical axis AA, the first surface 102 corresponds to the first optical region, and the second surface 104 corresponds to the second optical region which is concentric with the first surface 102.

[0048] The first toric surface 102 has a first meridian 1021 curved with a first curvature and a second meridian 1022 curved with a second curvature and perpendicular to the first meridian 1021. Similarly, the second surface 104 has a first meridian 1041 curved with a first curvature and a second meridian 1042 curved with a second curvature and perpendicular to the first meridian 1041. In particular, in each of the first and second surfaces 102 and 104, the second curvature is greater than the first curvature.

[0049] The peripheral edges of the first and second surfaces 102 and 104, respectively, have a circular cross-section. The first meridian 1021 of the first plane 102 is perpendicular to the first meridian 1041 of the first plane 104.

[0050] The first curvature of the first surface 102 may be different from or equal to the first curvature of the second surface 104. Similarly, the second curvature of the first surface 102 may be different from or equal to the second curvature of the second surface 104.

[0051] Thus, the lens 100 is composed of two concentric rings having different meridian axes, which are either opposite or in an anti-axial configuration, i.e., the angle between the two rings is 90°.

[0052] Figure 5 shows the distribution of light passing through the multifocal optical lens 100 under parallel illumination light in an example where the first curvature of the first surface is equal to the first curvature of the second surface, and the second curvature of the first surface is equal to the second curvature of the second surface. Light passing through the first meridian 1021 of the first surface 102 converges at the first focal length 106, thereby forming a first section 1081 parallel to the first meridian 1021, and light passing through the second meridian 1022 of the first surface 102 converges at the second focal length 110, forming a second section 1082 parallel to the second meridian 1022.

[0053] Furthermore, light passing through the first meridian 1041 of the second surface 104 converges at a first focal length 106, thereby forming a first section 1121 parallel to the first meridian 1041, and light passing through the second meridian 1042 of the second surface 104 converges at a second focal length 110, thereby forming a second section 1122 parallel to the second meridian 1042.

[0054] Therefore, the focal region obtained with such a lens 100 is longer than the focal region of the prior art multifocal lens. This elongated focal region depends on the torus of planes 102 and 104.

[0055] Since it was found that this focal region was not sufficiently concentrated, the inventors considered spiralizing the surface to obtain a focus concentrated in the tubular region, thereby enabling focus to be obtained over a longer distance along the optical axis.

[0056] Figures 6 and 7 show embodiments of a tubular focus optical lens 200 having two toric surfaces facing each other in the axial direction and two toric surfaces facing each other in a spiral arrangement in the axial direction, respectively. The optical lens 200 in Figure 6 includes a first toric surface 202 having a first meridian 2021 curved with a first curvature around the rotation axis of the first torus, and a second meridian (represented by a circular arc 2022 parallel to the second meridian) that is curved with a second curvature greater than the first meridian and perpendicular to the first meridian 2021. The optical lens 200 also includes a second toric surface 204 placed juxtaposed with the first toric surface 202, having a first meridian 2041 curved with a first curvature around the rotation axis of the second torus, and a second meridian (represented by a circular arc 2042 parallel to the second meridian) that is curved with a second curvature and perpendicular to the first meridian 2041. When viewed from the front, that is, when projected onto a projection plane perpendicular to the optical axis passing through the center 206 of the lens 200, the first toric surface 202 corresponds to two azimuth sectors 2082 and 2084 that are radially opposite and intersect at their vertices pointed toward the center 206 of the optical lens 200. Similarly, the second toric surface 204 corresponds to two azimuth sectors 2081 and 2083 that are radially opposite and intersect at their vertices pointed toward the center 206. Each of the azimuth sectors 2082 and 2084 of the first toric surface 202 is adjacent to the two azimuth sectors 2081 and 2083 of the second toric surface 204. The angular sector 208 is enclosed by the intersection of the first toric surface 202 and the second toric surface 204, which is the line of intersection in the space between the rings of two cylindrical cross-sections whose axes of rotation are perpendicular. These intersection lines are represented by boundary lines 2101, 2102, 2103, and 2104 between azimuth sectors 2081, 2082, 2083, and 2084. In space, each boundary line 2101, 2102, 2103, and 2104 is set back in the optical axis direction relative to the first meridians 2021 and 2041.

[0057] Figure 7 shows the optical lens 200 produced by the helication of the toric lens surface in Figure 6. Thus, the first meridian 2021 of the first toric surface 202 and the first meridian 2041 of the second toric surface 204 are helical segments whose center point 206 lies on the optical axis of the optical lens 200. Similarly, each of the boundary lines 2101, 2102, 2103, and 2104 is a helical segment whose center point 206 lies on the optical axis of the optical lens 200.

[0058] The helical segments can be generated in various ways, for example, according to linear laws, quadratic laws, or substantially logarithmic laws. To apply the logarithmic laws, it is necessary to simplify the portion of the lens near the center 206 where the angle of the helix mathematically diverges.

[0059] In the embodiment shown in Figure 7, the angle of increase reaches 45° at the periphery 25 of the optical lens 200. This angle can have other values, for example, between 30° and 720°, and is particularly equal to 60°. Here, the periphery 25 of the optical lens 200 has a circular shape. This shape may be other than circular.

[0060] Figures 8 and 9 show embodiments of a tubular focus optical lens 400 having two toric surfaces facing each other in the axial direction and two toric surfaces facing each other in a spiral arrangement in the axial direction, respectively.

[0061] The tubular focus optical lens 400 in Figure 8 is designed similarly to the optical lens 200 in Figure 6, but instead of four azimuthal sectors, it has three separate azimuthal sectors 401, 402, and 403. Each azimuthal sector 401, 402, and 403 has a toric surface segment with its respective first meridian 4011, 4021, and 4031 oriented in different azimuthal directions, which are 120° to each other in the symmetrical case as illustrated. A second meridian is not shown here, but in all cases it is perpendicular to each of the first meridians. The azimuthal sectors 401, 402, and 403 are enclosed by a boundary line 405.

[0062] Figure 9 shows the tubular focus lens 400 produced from the lens surface of Figure 8. Here, the helical segments follow the law of quadratic helixization, where the angle of the helix is ​​proportional to the square of the radial distance from the center 406 on the optical axis. Each of the boundary lines 405 and each of the principal meridians 4011, 4021, and 4031 have the same helical shape. In the embodiment shown in the figure, the angle of the helix reaches 360° (i.e., one full rotation) at the periphery of the optical lens 400. For larger lenses, two rotations (i.e., angles of 720° or more) are possible.

[0063] As a numerical example, the tubular focus optical lens 400 in Figure 9 has a front surface with four identical toric branches, and its parameters are as follows: - First curvature of the toric surface: corresponds to a focal length of 17.4 cm. - Second curvature of the toric surface: Equivalent to a focal length of 14 cm - The focal points are separated by 1.4 diopters each. - Spiral Shape: From Logarithmics to the Golden Ratio - Spiral angle: 720° - Lens diameter: 10mm - Other geometric parameters: The rear surface is spherical with a radius of curvature of 7.8 mm. The thickness of the central part of lens 400 is equal to 0.5 mm.

[0064] In general, the tubular focusing optical lens according to the present invention can be designed in the same way as one of the illustrated optical lenses 200, 400, and 800, using any number of toric surfaces, each occupying one azimuth sector. Thus, the number of toric branches of the helical surface distributed around the optical axis may be even (e.g., 2 branches for optical lens 800, 4 branches for optical lens 200) or odd (e.g., 3 branches for optical lens 400). Other branch counts are also possible, for example, 5, 6, 7 or more. Furthermore, the boundaries between adjacent toric surfaces may be steep or stepped. For example, by interpolating local curvature near the boundary, the transition region between adjacent toric surfaces can be made gentler, limiting extreme slopes.

[0065] The tubular focus obtained by the present invention is shown in Figure 10 by comparison between the prior art spherical optical lens 1301 and the tubular focus optical lens 1302 according to the present invention, each of these two lenses 1301 and 1302 designed for vision correction. In Figure 10, illumination light parallel to the lenses 1301 and 1302 is incident, and Z represents the region of sharpness perceived by the human eye on both sides of the object focus of the lens. As can be clearly seen from Figure 10, the helical lens 1302 can lengthen the region of sharpness Z enclosed by a virtual right cylinder. Thus, by helicalizing various optical powers, a tubular focus of light rays can be obtained. In other words, in the prior art spherical lens 1301, if one of the two dioptric interfaces is replaced with the helical toric surface 1302 according to the present invention, this has the effect of lengthening the focal region. In this case, the emmetropic region is no longer a point, but a focus tube.

[0066] The inventors performed ray tracing calculations for parallel illumination light. Figure 11 shows the lens 400, as shown in Figure 9, placed at the object-side focal point. The upper part of Figure 12 shows an enlarged view of the focal region XV.

[0067] Figure 12 also shows the focal lengths D1 and D2 corresponding to the first and second curvatures of the initial toric surface, respectively. On the right side of Figure 12, line 1501 shows the size of the focal spot at D1, and line 1502 shows the size of the focal spot at D2.

[0068] For comparison, the lower part of Figure 12 shows the same elements for axially opposed astigmatic lenses, similar to Figure 6, with the same curvature as the initial one in Figure 11, where line 1511 indicates the size of the focal spot at D1 and line 1512 indicates the size of the focal spot at D2.

[0069] As is clear from Figure 12, the helicalization of the lens according to the present invention has the effect of compressing the focal spot between D1 and D2 into a substantially right cylindrical shape.

[0070] Other modifications and advantages of the present invention can be realized without departing from the scope of the present invention.

[0071] In the illustrated embodiment, the spiral segment is made to cross the optical surface of the lens, but it is also possible to make only a portion of it spiral.

[0072] Figure 13 shows a modified example in which the optical lens 300 includes a spherical surface 302 located at the center of the optical surface of the lens 300, and helical segments are generated only at the periphery of the optical surface.

[0073] Figure 14 shows a modified example in which an optical lens 100 having two concentric toric surfaces 102 and 104 has a helically formed bonding portion 114 according to the present invention.

[0074] The present invention is not limited to the embodiments described herein, and in particular, the features of the illustrated embodiments can be combined in modified examples not shown. This application provides the invention in the following embodiments. (Aspect 1) Optical devices having an optical axis (100, 200, 400, 800), Having at least one surface having at least two meridians, At least one of these portions, when viewed from the front, forms at least one helical segment with its center point (206, 406, 806) on the optical axis. An optical device in which each helical segment defines a meridian of different optical powers such that the resulting focal point extends across the tubular region. (Aspect 2) The one or more helical segments include a first meridian curved with a first non-zero curvature and a second meridian curved with a second curvature that is strictly greater than the first curvature (202 2 , 803) is produced from a toric surface, The optical device according to embodiment 1, wherein the second meridian is perpendicular to the first meridian. (Aspect 3) The one or more helical segments are generated from the first and second toric surfaces, The first toric surface (208 2 , 401) is the first meridian (202) curved with a first non-zero curvature around the axis of rotation of the first torus. 1 、401 1 ) and a second meridian (202) curved with a second curvature that is strictly greater than the first curvature. 2 ) and The second meridian is perpendicular to the first meridian, and the second toric plane (208 1 , 402) is the first meridian (204) curved with a first non-zero curvature around the axis of rotation of the second torus. 1 、402 1 ) and curved with a second curvature that is strictly greater than the first curvature, and the first meridian (204) of the second toric surface 1 ) the second meridian (204) perpendicular to it 2 ) and Each of the first and second toric surfaces comprises a plurality of azimuth sectors arranged around the optical axis, The first toric surface (208 2 The first meridian (202) of 401) 1 、401 1 ) and the second toric surface (208 1 The first meridian (204) of 402) 1 、402 1 ) has an azimuthal direction separated from the optical axis at a non-zero angle, The aforementioned spiral segment is the first meridian (208) of the first toric surface. 2 , 401) and the first meridian of the second toric plane (208 1 The first and second optical power meridians (202) originating from 402 1 、401 1 、204 1 An optical device according to embodiment 2, which defines , 4021). (Aspect 4) The azimuth sector of the first toric surface (208 2 The optical device (200, 400) according to embodiment 3, wherein the azimuthal sector (2081) of the second toric plane and the azimuthal sector (210) are adjacent via a helical segment boundary line (210). (Appendix 5) The first toric surface (208 2 、208 4 ) and the second toric surface (208 1 、208 3 The optical device (200) according to embodiment 3 or embodiment 4, each comprising two radially opposing azimuthal sectors. (Aspect 6) The first toric surface (208 2 、208 4 Each angular sector of ) is the second toric surface (208 1 、208 3 An optical device (200) according to embodiment 5, adjacent to the two angular sectors of ). (Aspect 7) The first toric surface (208 2 The first meridian and the second toric plane (208) of 401) 1 The optical device (200, 400) according to any one of embodiments 3 to 6, wherein the angle between the azimuthal directions of the first meridian (402) is between 60° and 90°. (Pattern 8) The first toric surface (208 2 The first curvature of the 401) is the second toric surface (208 1 An optical device (200, 400) according to any one of embodiments 3 to 7, having a curvature equal to the first curvature of 402). (Aspect 9) The first toric surface (208 2 The second curvature of the 401) is the second toric surface (208 1 An optical device according to any one of embodiments 3 to 8, wherein the curvature is equal to the second curvature of 402). (Aspect 10) An optical device (200, 400, 800) according to any one of embodiments 1 to 9, wherein the radius of the helical segment is related to the angle of the helix in polar coordinates by a linear law, a quadratic law, or a logarithmic law. (Aspect 11) The optical device according to any one of embodiments 1 to 10, further comprising a spherical surface (302) centered on the optical axis. (Aspect 12) An optical device (200, 400, 800) according to any one of embodiments 1 to 11, which forms an optical lens with a front surface having at least one helical segment. (Aspect 13) Use of an optical device (200, 400, 800) according to any one of embodiments 1 to 12 for correcting vision and / or concentrating light-emitting power and / or forming an image.

Claims

1. Optical devices having an optical axis (100, 200, 400, 800), Having at least one surface having at least two meridians, At least one portion of the surface, when viewed from the front, forms at least one helical segment with its center point (206, 406, 806) on the optical axis. Each helical segment defines a meridian of different optical powers such that the resulting focal point extends across the tubular region. The one or more helical segments include a first meridian curved with a first non-zero curvature and a second meridian curved with a second curvature that is strictly greater than the first curvature (202 2 , 803) are produced by helication of a toric surface, The second meridian is perpendicular to the first meridian, The helication means that one or more helical segments have a first toric surface and a second toric surface, and each of the first and second toric surfaces has a first meridian curved with a first non-zero curvature and a second meridian (202 2, 803) curved with a second curvature that is strictly greater than the first curvature, and that the one or more helical segments are produced by making the boundary between the first toric surface and the second toric surface helical around the optical axis when viewed from the front. Optical devices.

2. The one or more helical segments are generated by helicating the first and second toric surfaces. The first toric surface (202, 401) is curved with a first non-zero curvature around the axis of rotation of the first torus, along the first meridian (202 1 ,401 1 ) and a second meridian (202) curved with a second curvature that is strictly greater than the first curvature. 2 The second meridian is perpendicular to the first meridian, and the second toric surface (204, 402) is curved with a first non-zero curvature around the axis of rotation of the second torus, and the second meridian is perpendicular to the first meridian (204 1 ,402 1 ) and curved with a second curvature that is strictly greater than the first curvature, and the first meridian (204) of the second toric surface 1 The second meridian (204) perpendicular to ) 2 ) and The first and second toric surfaces are each an azimuth sector (208 2 , 208 4 ; 208 1 , 208 3 ) that includes a plurality of angular sectors arranged around the optical axis The first meridian of the first toric surface and the first meridian of the second toric surface are helical segments whose center point lies on the optical axis of the optical device. The first meridian (202, 401) of the first toric surface (202 1 ,401 1 ) and the first meridian (204, 402) of the second toric surface (204 1 ,402 1 ) has an azimuthal direction separated from the optical axis at a non-zero angle, The aforementioned spiral segment is the first meridian (202) of the first toric surface. 1 ,401 1 ) and the first meridian of the second toric plane (204 1 ,402 1 The optical device according to claim 1, as defined by ).

3. The azimuth sector (208) of the first toric surface 2 ,208 4 ) one of the and the azimuth sector (208) of the second toric surface 1 ,208 3 ) one of them is adjacent, and the boundary line (210) separates the adjacent azimuth sectors. 1 ,210 2 ,210 3 ,210 4 The optical device (200, 400) according to claim 2, wherein the ) has the shape of a spiral line.

4. The first toric surface (208 2 The first meridian and the second toric plane (208) of 401) 1 The optical device (200, 400) according to claim 2 or 3, wherein the angle between the azimuthal directions of the first meridian (200, 400) is set between 60° and 90°.

5. The first toric surface (208 2 The first curvature of the 401) is the second toric surface (208 1 The optical device (200, 400) according to any one of claims 2 to 4, wherein the curvature is equal to the first curvature of 402.

6. The first toric surface (208 2 The second curvature of the 401) is the second toric surface (208 1 The optical device according to any one of claims 2 to 5, wherein the curvature is equal to the second curvature of 402).

7. The optical device (200, 400, 800) according to any one of claims 1 to 6, wherein the radial distance of the helical segment from the optical axis changes according to a linear law, a quadratic law, or a logarithmic law depending on the rotation angle of the helix.

8. The optical device according to any one of claims 1 to 7, further comprising a spherical surface (302) centered on the optical axis.

9. An optical device (200, 400, 800) according to any one of claims 1 to 8, comprising an optical lens formed with a surface having at least one helical segment as its front surface.

10. Use of an optical device (200, 400, 800) according to any one of claims 1 to 9 for correcting vision and / or concentrating light-emitting power and / or forming an image.

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