Spectacle lens and spectacles

Abstract

To provide a technique that allows a wearer to properly experience virtual reality and / or augmented reality by the use of material of an ordinary spectacle lens.SOLUTION: There are provided a spectacle lens 1 and its related technique, and the spectacle lens 1 has an object-side surface and an eyeball-sized surface, and comprises a light guide member 2, a first lens element 3 adjoining the light guide member on the object side, and a second lens element 4 adjoining the light guide member on the eyeball side, wherein when luminous flux passing through the first lens element 3 and second lens element 4 forms an image to obtain a real image, prescription values of a wearer are actualized by the first lens element 3 and second lens element 4, and a virtual image obtained by forming an image with luminous flux traveling in the light guide member to pass through the second lens element 4 is displayed by the second lens element 4 at one predetermined distance from the wearer.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a spectacle lens and a pair of glasses. In particular, the present invention relates to a spectacle lens and a pair of glasses for a system that allows a wearer to experience virtual reality and / or augmented reality and that can be attached to a user's head. The present invention can also be applied to lens elements that constitute the spectacle lens and to a spectacle frame. [Background technology]

[0002] Patent document 1 is known for a virtual reality and augmented reality image and visualization system. Patent document 1 describes that a variable focus optical element capability may be utilized to change the focus of the wavefront of light emerging from a waveguide, providing the eye with the perception that the light originating from the waveguide is from a particular focal distance (reference numeral 166 in FIG. 7A). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] WO2015 / 081313 Brochure Summary of the Invention [Problem to be solved by the invention]

[0004] A variable-focus lens is used in the technology described in Patent Document 1. However, when using a variable-focus lens, a special lens such as a liquid crystal lens or an electroactive lens is required.

[0005] If it were possible to allow a wearer to properly experience virtual reality and / or augmented reality while using non-variable focus lenses, which are the same material as ordinary eyeglass lenses, the barrier to experiencing virtual reality and / or augmented reality could be further lowered.

[0006] An embodiment of the present invention aims to provide a technology that allows a wearer to appropriately experience virtual reality and / or augmented reality by utilizing materials of ordinary eyeglass lenses. [Means for solving the problem]

[0007] In order to provide the above-mentioned experience to a presbyopic wearer, a progressive power lens is necessary. The wearer can wear a pair of glasses with the above-mentioned experience-providing spectacle lenses, or even a pair of glasses with the spectacle lenses fitted in the spectacle frames, over the spectacle lenses that are progressive power lenses that the wearer already owns. These glasses are hereinafter also referred to as experience glasses. The lenses of these glasses are hereinafter also referred to as experience lenses.

[0008] On the other hand, a virtual image obtained by focusing the light flux transmitted through the light guide member is distorted due to the progressive effect of the progressive power lens already owned by the wearer.

[0009] The present inventors have conducted extensive research into this issue and have come up with the following aspects to allow a wearer to appropriately experience virtual reality and / or augmented reality using materials of ordinary eyeglass lenses. The aspects relating to this discovery are referred to as aspect group 1.

[0010] The first aspect of the present invention is having an object-side surface and an eyeball-side surface, A spectacle lens comprising a light guiding member, a first lens element adjacent to the light guiding member on an object side, and a second lens element adjacent to the light guiding member on an eyeball side, When a light beam passing through the first lens element and the second lens element is focused to obtain a real image, the prescription value of the wearer is realized by the first lens element and the second lens element, and a virtual image obtained by focusing the light beam passing through the second lens element after transmitting through the light guiding member is displayed at a predetermined distance from the wearer by the second lens element, The first lens element is a spectacle lens having a progressive power lens that realizes an addition power that is one of the prescription values ​​of the wearer.

[0011] A second aspect of the present invention is The first lens element is a progressive power lens that realizes an addition power among the prescription values, The second lens element is the spectacle lens according to the first aspect, which realizes prescription values ​​other than the addition power.

[0012] A third aspect of the present invention is The light guide member is a flat plate having two flat surfaces, the first lens element includes a progressive power lens and a plus lens, and a surface of the plus lens adjacent to the flat surface of the light guide member is flat; The spectacle lens according to the first aspect, wherein the second lens element comprises a minus lens, and a surface of the minus lens adjacent to the flat surface of the light guiding member is flat.

[0013] In order to provide the above experience appropriately for refractive errors of the eye, the wearer may wear the experience glasses over the glasses lenses (e.g., single-vision lenses) that they already own. However, a gap may be created between the glasses lenses that the wearer already owns and the experience lenses. If a gap is created between the two lenses, the angle of view that the wearer can see is reduced.

[0014] The present inventors have conducted extensive research into this issue and have come up with the following aspects that allow a wearer to appropriately experience virtual reality and / or augmented reality images using materials of ordinary eyeglass lenses. The aspects relating to this discovery are referred to as aspect group 2.

[0015] A fourth aspect of the present invention is having an object-side surface and an eyeball-side surface, A spectacle lens comprising a light guiding member, a first lens element adjacent to the light guiding member on an object side, and a second lens element adjacent to the light guiding member on an eyeball side, When a light beam passing through the first lens element and the second lens element is focused to obtain a real image, the prescription value of the wearer is realized by the first lens element and the second lens element, and a virtual image obtained by focusing the light beam passing through the second lens element after transmitting through the light guiding member is displayed at a predetermined distance from the wearer by the second lens element, the first lens element comprises a plus lens having a positive power that is the reciprocal of the one predetermined distance; The second lens element is a spectacle lens having a single functional compound lens, the spherical power of which is a sum of the negative power of the reciprocal of the one predetermined distance and the spherical power of the prescription value.

[0016] A fifth aspect of the present invention is The light guide member is a flat plate having two flat surfaces, a surface of the positive lens adjacent to the flat surface of the light guiding member is flat; The spectacle lens according to the fourth aspect, wherein the surface of the function compound lens adjacent to the flat surface of the light guiding member is flat.

[0017] The use of a non-variable focus lens, which is a material of a normal eyeglass lens, means that a material of a normal eyeglass lens (e.g., a material made of plastic or glass) is used. The presence or absence of refractive error and its degree differ for each wearer. In addition, the distance at which the virtual image is displayed (referring to the distance from the wearer; the same applies below) also differs depending on the type of virtual image to be displayed and the display situation. The use of one non-variable focus lens means that it is not possible to respond to various situations of each wearer and virtual image.

[0018] The present inventors have conducted extensive research into this issue and have come up with the following aspects that allow a wearer to appropriately experience virtual reality and / or augmented reality images using materials of ordinary eyeglass lenses. The aspects relating to this discovery are referred to as aspect group 3.

[0019] A sixth aspect of the present invention is a method for producing a composition comprising the steps of: having an object-side surface and an eyeball-side surface, A spectacle lens comprising a light guiding member, a first lens element adjacent to the light guiding member on an object side, and a second lens element adjacent to the light guiding member on an eyeball side, a spectacle lens which, when a light beam passing through the first lens element and the second lens element is focused to obtain a real image, realizes a prescription value of a wearer by the first lens element and the second lens element, and displays a virtual image obtained by focusing a light beam passing through the second lens element after transmitting through the light guiding member at a predetermined distance from the wearer by the second lens element; Eyeglass frames and Equipped with The pair of glasses is configured so that at least one of the first lens element and the second lens element is removable.

[0020] A seventh aspect of the present invention is a method for producing a composition comprising the steps of: The eyeglasses according to the sixth aspect, wherein at least the second lens element is removable.

[0021] An eighth aspect of the present invention is a method for producing a composition comprising the steps of: The eyeglass frame is a pair of glasses described in the sixth or seventh aspect, which includes at least one of a first lens element holder having a mechanism for freely attaching and detaching the first lens element, and a second lens element holder having a mechanism for freely attaching and detaching the second lens element.

[0022] The above aspects may be combined as appropriate.

[0023] Other aspects of the present invention will be described below, focusing on the lens elements in each of the above groups of aspects. The following aspects may be appropriately combined with each of the above aspects.

[0024] An eighth aspect of the present invention is a method for producing a composition comprising the steps of: a first lens element which is a single progressive power lens that realizes the addition power of the prescription value and is a plus lens having a predetermined positive power at a progressive start point; A second lens element, which is a minus lens for realizing prescription values ​​other than the addition power and has a negative power having an absolute value equivalent to the positive power; A lens element comprising:

[0025] A ninth aspect of the present invention is a method for producing a composition comprising the steps of: a first lens element which is a plus lens having a predetermined positive power; A second lens element which is a single functional compound lens having a power obtained by combining a negative power having an absolute value equivalent to the positive power and a spherical power which is one of the prescription values; A lens element comprising:

[0026] A tenth aspect of the present invention is a method for producing a composition comprising the steps of: The first lens element is a lens element according to a ninth aspect, which is a single progressive power lens that realizes the addition power of the prescription value and is a plus lens having a predetermined positive power at the starting point of progression.

[0027] An eleventh aspect of the present invention is a method for producing a composition comprising the steps of: the first lens element has two major surfaces; the second lens element has two major surfaces; The lens element according to any one of the eighth to tenth aspects, wherein one main surface of the first lens element and one main surface of the second lens element are both flat.

[0028] A twelfth aspect of the present invention is a method for producing a composition comprising the steps of: This lens element is a functional compound lens having a power that is a combination of a spherical power, which is one of the prescription values, and a negative power of -0.25D or less.

[0029] A thirteenth aspect of the present invention is a method for producing a composition comprising the steps of: A lens element according to a twelfth aspect, wherein the lens element has two major surfaces, one of which is flat.

[0030] Other aspects of the present invention will be described below. The following aspects may be appropriately combined with the above aspects.

[0031] The second lens element may realize at least one of a cylindrical power other than 0D and a prism power other than 0Δ among the prescription values. In this case, the first lens element may have a positive power that is the reciprocal of the predetermined one distance at least at the lens center. In the first aspect group, the first lens element may have a progressive surface that realizes an add power while maintaining the positive power at the lens center.

[0032] In the embodiment group 1, the first lens element includes a progressive power lens. However, other functional lenses (for example, photochromic lenses) may be provided together with the progressive power lens or in place of the progressive power lens.

[0033] having an object-side surface and an eyeball-side surface, A spectacle lens comprising a light guiding member, a first lens element adjacent to the light guiding member on an object side, and a second lens element adjacent to the light guiding member on an eyeball side, A spectacle frame fitted with a spectacle lens, the spectacle lens realizing a prescription value of a wearer by the first lens element and the second lens element when a light beam passing through the first lens element and the second lens element is focused to obtain a real image, and the spectacle lens displays a virtual image obtained by focusing a light beam passing through the second lens element after transmitting through the light guiding member at a predetermined distance from the wearer by the second lens element, An eyeglass frame comprising at least one of a first lens element holder having a mechanism for freely attaching and detaching the first lens element, and a second lens element holder having a mechanism for freely attaching and detaching the second lens element.

[0034] A virtual image display system including the above-mentioned eyeglass lens and an image light emitting unit that emits image light, and a program for causing a computer to perform the functions provided by the system. Effect of the Invention

[0035] According to one embodiment of the present invention, the material of ordinary eyeglass lenses can be used to allow the wearer to adequately experience virtual reality and / or augmented reality. [Brief description of the drawings]

[0036] [Figure 1] FIG. 1 is a horizontal cross-sectional schematic diagram showing an embodiment of a spectacle lens of the present invention functioning as a part of a virtual image display system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0037] An embodiment of the present invention will be described below. The symbol "to" indicates a value greater than or equal to the specified value and less than or equal to the specified value.

[0038] <Common items for group 1 to 3> One aspect of the invention relates to spectacle lenses, spectacles and lens elements for a system that can be mounted on a user's head to provide a wearer with a virtual reality and / or augmented reality experience.

[0039] A system according to one aspect of the present invention includes an image light emitting unit that emits image light, and the following eyeglass lenses. The image light emitting unit refers to a unit that includes components necessary for emitting image light, such as a light source and a projection lens. As with a real image, a light beam of image light passes through the wearer's pupil and forms an image on the retina, causing the wearer to recognize a virtual image. There is no limitation on the virtual image, and it may be a moving image or a still image.

[0040] This system may be a head mounted display or smart glasses. Hereinafter, a case where this system is smart glasses will be exemplified. One aspect of the present invention is also a spectacle lens in the smart glasses.

[0041] The eyeglass lens according to one embodiment of the present invention will be described with reference to Fig. 1. Fig. 1 is a horizontal cross-sectional schematic diagram showing that the eyeglass lens according to one embodiment of the present invention functions as a part of a virtual image display system. Each symbol is as described in the description of symbols in this specification. Description of symbols will be omitted in this specification.

[0042] A spectacle lens according to one aspect of the present invention has a see-through function and has an object-side surface and an eyeball-side surface. The object-side surface and the eyeball-side surface are opposed to each other, and a portion of the surface that faces the object-side surface in the optical axis direction is the eyeball-side surface, and conversely, a portion of the surface that faces the eyeball-side surface in the optical axis direction is the object-side surface.

[0043] The y direction in this specification is the direction along the meridian and is the vertical direction. When worn, the upper side of the lens is the +y direction, and the lower side of the lens is the -y direction. The x direction is the direction perpendicular to the meridian and is the horizontal direction. When viewed from the wearer's perspective, the right side of the lens is the +x direction, and the left side of the lens is the -x direction. The direction perpendicular to the x and y directions, that is, the lens thickness direction (optical axis direction), is the z direction, with the object side being the +z direction and the eyeball side being the -z direction.

[0044] One feature of one aspect of the present invention is that a non-variable focus lens is used instead of the variable focus lens described in Patent Document 1. For example, configurations other than the technology related to the optical part described in Patent Document 1 (specific configurations of the light source, projection lens, light guide member (or waveguide), drive control unit of the system, etc.) may be publicly known, and details will be omitted.

[0045] A spectacle lens according to one aspect of the present invention includes a light guiding member, a first lens element adjacent to the light guiding member on an object side, and a second lens element adjacent to the light guiding member on an eyeball side.

[0046] A light-guiding member according to an aspect of the present invention may include a portion through which a light beam actually passes (also referred to as a waveguide in this specification) and a portion that covers and protects the waveguide.

[0047] The first lens element is adjacent to the light guide member on the object side. The second lens element is adjacent to the light guide member on the eyeball side. In this specification, "adjacent" includes a state of physical contact with the light guide member, and also a state of being close but not in contact (e.g., a maximum separation distance of 8 mm, 5 mm, or 3 mm at the geometric centers of the lenses).

[0048] Both the first lens element and the second lens element are non-variable focus lenses made of plastic or glass. The first lens element and the second lens element may include a hard coat layer, an anti-reflection layer, an anti-fouling layer, and the like.

[0049] The spectacle lens according to one aspect of the present invention has a see-through function. Therefore, when a light beam passing through the first lens element and the second lens element is focused to obtain a real image, the first lens element and the second lens element realize the prescription value of the wearer. The realization of the prescription value of the wearer is achieved by the refractive index and surface shape of each of the materials of the first lens element and the second lens element.

[0050] A virtual image obtained by focusing a light beam transmitted through the light guiding member and passing through the second lens element is displayed by the second lens element at a predetermined distance from the wearer. This predetermined distance is also called a "display distance."

[0051] As shown in FIG. 1, the light beam of the virtual image passes through the second lens element, not the first lens element. Therefore, the second lens element may be set to a curved shape that allows the virtual image to be displayed at a distance of the display distance (e.g., 2 m) from the wearer. As a specific example, a concave surface with a power of 0.50 D (= 1 / (2 m)) (i.e., -0.50 D) may be set as the curved shape. At the same time, the first lens element may be set to +0.50 D. With this configuration, a wearer without refractive error can properly view the outside world and properly view the virtual image at a distance of the display distance.

[0052] Incidentally, the prescription value of the wearer is written on the lens bag of the eyeglass lens. This is no exception even in the case of the eyeglass lens according to one aspect of the present invention, which is equipped with a light guiding member. This is because the eyeglass lens according to one aspect of the present invention requires the prescription value to be written on it, since refractive error is corrected when checking the outside world. As a result, even the eyeglass lens according to one aspect of the present invention comes with a lens bag.

[0053] The presence of a lens bag makes it possible to identify the spectacle lens based on the wearer's prescription. Spectacle lenses are usually set together with a lens bag. Therefore, the technical idea of ​​the present invention is reflected in spectacle lenses that come with a lens bag, and the same is true for sets of lens bags and spectacle lenses.

[0054] The prescription value of the wearer may include, for example, the spherical power (S power) when looking straight ahead (at infinity), the cylindrical power (C power), the cylindrical axis (Ax), and the prism power (Δ). In the case of a progressive power lens, the prescription value may also include the addition power (ADD) in addition to the above. In this specification, the "addition power" is the difference (positive value in this specification) between the spherical power when looking straight ahead (at infinity) and the power required to correct vision when looking near.

[0055] There is no limit to the number of lenses constituting the first lens element. There is no limit to the number of lenses constituting the second lens element. On the other hand, increasing the number of lenses leads to an increase in the thickness of the experience lens, so preferably, the lens constituting the first lens element is a single plus lens (the surface on the object side is a convex surface), and the lens constituting the second lens element is a single minus lens (the surface on the eyeball side is a concave surface). Details will be described later.

[0056] In the above example, the surface facing the object side of the eyeglass lens is convex, and the surface facing the eyeball side is concave. In other words, the above example is a meniscus lens.

[0057] <Aspect Group 1> One of the features of the embodiment group 1 is that the first lens element comprises a progressive power lens that realizes an addition power that is one of the prescription values ​​of the wearer.

[0058] As described in the above section on the means, the virtual image obtained by focusing the light beam transmitted through the light guide member is distorted by the progressive action of the progressive power lens that the wearer already owns. The countermeasure is to have the above-mentioned features of mode group 1. The first lens element does not pass the light beam related to the virtual image. Focusing on this point, one of the features of mode group 1 is that the progressive component of the progressive power lens is concentrated in the first lens element, through which the light beam related to the virtual image does not pass. Thanks to this feature, it is possible to correct the wearer's presbyopia while avoiding the virtual image being distorted by the progressive action.

[0059] The addition power of the prescription value is preferably realized by the first lens element which is a progressive power lens. In one specific example of the first mode group, the object side surface of the first lens element is a progressive surface, while none of the eyeball side surface of the first lens element, the object side surface of the second lens element, and the eyeball side surface of the second lens element are progressive surfaces. In that case, it can be said that the addition power is realized only by the first lens element (more specifically, the object side surface of the first lens element).

[0060] It is preferable that the prescription value other than the addition power is realized by the second lens element. Of course, the prescription value is realized by a combination of the object side surface and the eyeball side surface of the spectacle lens. On the other hand, in one specific example of the mode group 1, it is preferable that the object side surface of the first lens element is a progressive surface, and the power of the lens center (described later) of the first lens element is a power corresponding to the display distance of the virtual image.

[0061] Then, by processing the eyeball side surface of the second lens element into a predetermined shape, the prescribed value including the addition power is realized when the light flux, which is the external light that has passed through the first lens element and the second lens element, forms an image on the wearer's retina and the wearer visually recognizes a real image. In this specification, using the shape of the second lens element (in the case of a single lens, its eyeball side surface) to make the prescription values ​​other than the addition power consistent is referred to as "the prescription values ​​other than the addition power are realized by the second lens element."

[0062] As described in the above paragraph, the first lens element is also indispensable for realizing the prescription value in order to view the real image. On the other hand, in the example described in this paragraph, the first lens element mainly plays the role of realizing the addition power and having a positive power according to the display distance at which the virtual image is placed. Therefore, it is acceptable to say that "the prescription value other than the addition power is realized by the second lens element" means that "the first lens element does not have any special contribution that affects the realization of the prescription value other than the addition power."

[0063] Of course, it is possible to realize a power other than the addition power with the first lens element, but in that case, the first lens element, which is a progressive power lens, has a complex surface shape. If such a first lens element is prepared as a non-variable focus lens, it may be easier to prepare a variable focus lens.

[0064] Therefore, it is preferable that the first lens element is a progressive power lens that realizes the addition power of the prescription value. It is easier to process the prescription value other than the addition power than to process the progressive component. Therefore, there is no problem in processing the second lens element to reflect the prescription value other than the addition power.

[0065] The light guide member is preferably in the form of a flat plate having two flat surfaces (principal surfaces) facing each other in the lens thickness direction. The light guide member can also be curved. The light guide member can also be curved to have a meniscus shape. However, when the waveguide is curved, it becomes very difficult to control the formation of a virtual image. When the surface shape of the portion that covers and protects the waveguide is curved, the light guide member becomes bulky. This leads to an increase in the edge thickness of the eyeglass lens. When adopting the form of eyeglasses (smart glasses), an increase in the edge thickness is not preferable. Therefore, the light guide member is preferably in the form of a flat plate.

[0066] In this specification, the term "flat" includes both a completely flat and an incomplete flat. An incomplete flat may be one in which a recess is provided in one of the two main flat surfaces, for example, at a portion connected to an image light emitting portion that emits image light. As an example, the light guide member is considered to be flat when 50% or more of the area (preferably 80% or more of the area) of each of the two main surfaces of the light guide member is in the same plane.

[0067] In addition, the first lens element preferably includes a progressive power lens and a plus lens, and the surface of the plus lens adjacent to the flat surface of the light guiding member is flat, and the second lens element preferably includes a minus lens, and the surface of the minus lens adjacent to the flat surface of the light guiding member is flat.

[0068] If the two main surfaces of the light-guiding member are curved, the surface of the first lens element adjacent to the light-guiding member must also be shaped to match the curved surface. This is because unintended refractive power occurs between the first lens element and the light-guiding member. In that case, the first lens element must be processed to reflect the progressive component on one surface, and it takes time to process the first lens element into a curved surface shape that matches the light-guiding member. In that case, if the light-guiding member is made flat from the beginning, there is no need to process it into a curved surface shape. The contents of this paragraph also apply to the second lens element.

[0069] Below, a specific example will be given assuming that the light guide member is flat and a virtual image is displayed at a distance of 2 m.

[0070] On the object side surface of the first lens element, which is a progressive power lens, the power is set to +0.50D at the measurement reference point F and the lens center (optical center, fitting point, eye point). The progressive start point is located at the lens center or just below it. And, if the add power in the prescription value of a presbyopic wearer is 1.50D, it is set to 2.00D at the near power measurement reference point. The eyeball side surface of the first lens element is plano. In other words, the first lens element is a plus lens.

[0071] Incidentally, the positions of the measurement reference point F, the fitting point or eye point FP, and the measurement reference point N can be specified by referring to a remark chart or centration chart issued by the lens manufacturer.

[0072] The surface of the second lens element on the eyeball side has a shape that reflects the prescription values ​​other than the add power. For example, if the prescription value S power is -3.00D and the C power is 0.00D, the concave shape is -3.50D, which is the sum of -0.50D and the S power -3.00D for displaying a virtual image 2m away. The surface of the second lens element on the object side is plano. In other words, the second lens element in this example is a minus lens.

[0073] The contents described in the section on aspect group 1 can be combined with other aspect groups and modified examples as appropriate.

[0074] <Aspect Group 2> One of the features of the mode group 2 is that the second lens element has a power that is a combination of a power corresponding to the display distance (-0.50D in the above example) and a spherical power that is one of the prescription values. In other words, one of the features of the mode group 2 is that the second lens element is integrated with a lens element that exhibits a function of displaying a virtual image at a predetermined distance and a lens element that exhibits a function of correcting the refractive error of the wearer.

[0075] As described in the above section on means, a gap is created between the eyeglass lens already owned by the wearer and the above-mentioned trial lens. When a gap is created between the two lenses, the angle of view that the wearer can see is reduced. The solution to this problem is to have the above-mentioned feature of mode group 2. Thanks to this feature, no gap is created between the two lenses, and the angle of view that the wearer can see is not reduced.

[0076] The specific configuration of the mode group 2 is as follows. The first lens element includes a plus lens having a positive power of the reciprocal of the one predetermined distance. The second lens element includes a single functional compound lens having a power obtained by combining a negative power of the reciprocal of the one predetermined distance and a spherical power that is one of the prescription values. In detail, the spherical power of the functional compound lens is a value obtained by combining a negative power of the reciprocal of the one predetermined distance and a spherical power of the prescription value. In any case, the functional compound lens has a power corresponding to the one predetermined distance and a prescription value (spherical power, cylindrical power, cylindrical axis, prism power, etc.).

[0077] When the specific numerical examples used in the group 1 and the example in which the light guiding member is flat are adopted in the group 2, the first lens element has a plus lens with +0.50D (positive power, which is the reciprocal of the display distance) on the object side and 0D (plano) on the eyeball side adjacent to the light guiding member. The second lens element has a concave shape with a negative power of -3.50D (=-0.50D+(-3.00D)) on the eyeball side and a minus lens with 0D (plano) on the object side adjacent to the light guiding member.

[0078] In the above example, a single minus lens having a negative power obtained by combining the negative power of the reciprocal of the indicated distance with the spherical power, which is one of the prescription values, is given, but the present invention is not limited to this. For example, when the S power of the prescription value is +3.00D, the surface on the eyeball side is a convex shape (plus lens) with a positive power of +2.50D (=-0.50D+3.00D). When the S power of the prescription value is +0.50D, the surface on the eyeball side is 0D (=-0.50D+0.50D). When the light guide member is flat, the second lens element is provided with a single disk-shaped lens. The lens provided in the second lens element in such a case is collectively called a "functional composite lens."

[0079] The contents described in the section on aspect group 2 can be combined with other aspect groups and modified examples as appropriate.

[0080] <Aspect Group 3> Aspect group 3 focuses on glasses (smart glasses). One of the features of aspect group 3 is that at least one of the first lens element and the second lens element (at least the second lens element, and in some cases both lens elements) is detachable from the glasses. Hereinafter, a case where both lens elements are detachable from the glasses will be illustrated, but only one of the two lens elements may be detachable, and in particular only the second lens element may be detachable. Therefore, the present invention is not limited to this example.

[0081] As described in the above section on the means, using one non-variable focus lens means that it is not possible to accommodate various conditions of each wearer and virtual image. The solution to this problem is to prepare multiple types of the first lens element and the second lens element.

[0082] Regarding the first lens element, when the mode group 1 is adopted, the first lens element has a progressive power lens. In other words, it is necessary to prepare a plurality of types of progressive power lenses. Of course, it is possible to manufacture the first lens element after receiving an order for spectacles (smart glasses), but it is not realistic in terms of work efficiency to manufacture different progressive surfaces for each order. Therefore, it is realistic to prepare a semi-finished lens in which a progressive surface with a predetermined addition power is formed on the object side surface in advance.

[0083] If semi-finished lenses that reflect prescription values ​​other than the addition power are prepared, it is necessary to prepare a number of types of semi-finished lenses corresponding to the number of combinations of each prescription value.

[0084] On the other hand, when adopting mode group 1, fewer types of semi-finished lenses need to be prepared. This is because the progressive power lenses in mode group 1 realize the addition power among the prescription values. If the progressive power lenses realize the addition power, the types of semi-finished lenses to be prepared can be significantly reduced compared to the case where prescription values ​​other than the addition power are also reflected.

[0085] If the light guide member is flat, the surface of the first lens element facing the eyeball will also be flat, and if the surface opposing the progressive surface of the semi-finished lens is made flat, even the effort of additional processing can be eliminated.

[0086] Regarding the second lens element, when the mode group 2 is adopted, the second lens element is provided with a minus lens having a negative power obtained by combining the negative power of the reciprocal of the one predetermined distance and a spherical power that is one of the prescription values. If it is a minus lens, it is easy to process it from a lens blank by conventional technology. If the light guide member is flat, the object side surface of the second lens element is also flat, making it even easier to process.

[0087] There is no limitation on the specific configuration for making the first lens element and / or the second lens element detachable from the eyeglasses. Any configuration of the eyeglasses may be provided with a mechanism that allows the first lens element and / or the second lens element to be gripped and detached. This mechanism may be provided in the light guide member, but the light guide member is a precision member even though it is protected, and it is not preferable to subject it to shocks each time it is attached or detached. For this reason, it is preferable to provide the mechanism in the eyeglass frame. It is preferable to provide the mechanism in the rim of the eyeglass frame, which is located close to the eyeglass lenses.

[0088] As a specific example of the above mechanism, for example, a half-rim may be adopted for eyeglasses, in which a rim is provided only on the upper side, and the upper rim may be provided with a groove and a stopper that allows the first lens element and second lens element positioned on either side of the light-guiding member to be grasped and detached while the light-guiding member is fixed to the rim.

[0089] As another specific example of the above mechanism, for example, a full rim may be adopted in eyeglasses, in which a rim is provided that covers the entire circumference of the eyeglass lens, and a slot with a lid may be provided in the upper rim, and the light-guiding member may be fixed to the rim while a first lens element and a second lens element positioned on either side of the light-guiding member may be inserted and removed through the slot.

[0090] <Modification> Although the embodiment of the present invention has been described above, the above-mentioned disclosure shows an exemplary embodiment of the present invention. In other words, the technical scope of the present invention is not limited to the above-mentioned exemplary embodiment, and various modifications are possible without departing from the gist of the present invention. In addition, the above-mentioned disclosure can be arbitrarily selected and combined with the following modified examples.

[0091] In one embodiment of the present invention, the case where the C power is 0.00D is exemplified, but the present invention is applicable even if the C power is other than the above. Specifically, the surface of the second lens element on the eyeball side may be a toric surface corresponding to the C power and the axis of astigmatism Ax. Also, when the prism power Δ exists as a prescription value, the shape corresponding to the prism power Δ may be reflected on the surface of the second lens element on the eyeball side.

[0092] That is, the second lens element may realize at least one of a cylindrical power other than 0D and a prism power other than 0Δ among the prescription values. In this case, the first lens element may have a positive power that is the reciprocal of the predetermined one distance at least at the lens center. In the aspect group 1, the first lens element may have a progressive surface that realizes an add power while maintaining the positive power at the lens center.

[0093] In one aspect of the present invention, for ease of explanation, the technical content is described so as to be applicable to the case where the surface shape of the second lens element is spherical. On the other hand, the surface shape of the second lens element in one aspect of the present invention may be spherical or may be other shapes (for example, a toric surface, a shape corresponding to the prism power Δ).

[0094] In the first group of aspects, the object side surface of the progressive power lens included in the first lens element may be an aspheric progressive surface. The surface of the first lens element adjacent to the light guiding member (for example, the eyeball side surface of the progressive power lens) and the surface of the second lens element adjacent to the light guiding member may have shapes following the main surface of the light guiding member. The eyeball side surface of the second lens element may have a shape that realizes prescription values ​​other than the addition power, and may be spherical or aspheric.

[0095] In the mode group 2, the object side surface of the plus lens included in the first lens element may be an aspheric progressive surface as in the mode group 1, or may be spherical. The surface of the first lens element adjacent to the light guide member (for example, the eyeball side surface of the plus lens) and the surface of the second lens element adjacent to the light guide member (for example, the object side surface of the function synthesis lens) may have a shape following the main surface of the light guide member. The eyeball side surface of the function synthesis lens may be spherical or aspheric as long as it has a power that is a combination of a negative power corresponding to the display distance and a spherical power. As with the second lens element in the mode group 1, there is no limitation on the shape of the eyeball side surface of the function synthesis lens as long as the prescription value can be made consistent using the shape of the eyeball side surface of the function synthesis lens. In the mode group 2, all prescription values ​​including the addition power may be realized by the function synthesis lens.

[0096] In the embodiment group 1, the first lens element includes a progressive power lens. However, other functional lenses (for example, photochromic lenses) may be provided together with the progressive power lens or in place of the progressive power lens.

[0097] One of the features of mode group 1 is that the first lens element includes a progressive power lens, and it is not necessary to have the features of mode groups 2 and 3. For example, in mode group 1, the second lens element may be a separate lens element that performs the function of displaying a virtual image at a predetermined distance and a lens element that performs the function of correcting the refractive error of the wearer. In addition, the first lens element and / or the second lens element do not need to be detachable from the spectacles.

[0098] Similarly, mode group 2 does not need to have the features of mode groups 1 to 3. For example, in mode group 2, the first lens element does not need to include a progressive power lens, and all prescription values ​​may be achieved by the second lens element. Also, the first lens element and / or the second lens element do not need to be detachable from the spectacles.

[0099] Similarly, in the embodiment group 3, it is not necessary to have the features of the embodiment groups 1 and 2.

[0100] However, as described in the items of each mode group, the configuration of each mode group brings about great advantages, so it is preferable to arbitrarily combine the configurations of each mode group, and it is more preferable to combine some or all of the contents described in the items of each mode group.

[0101] As described in the items common to the groups of aspects 1 to 3, one feature of one aspect of the present invention is that the variable focus lens in Patent Document 1 is a non-variable focus lens. Therefore, the technical idea of ​​the present invention is reflected in the lens elements adopted in each group of aspects.

[0102] The lens elements in embodiment group 1 have the following configuration. "A first lens element is a single progressive power lens that realizes the addition power of the prescription value and is a plus lens having a predetermined positive power at the starting point of progressive power; A second lens element, which is a minus lens for realizing prescription values ​​other than the addition power and has a negative power having an absolute value equivalent to the positive power; A lens element comprising: In this specification, "powers having equivalent absolute values" includes cases where the powers are completely the same, and also cases where the powers are within the tolerance range of the power of the eyeglass lenses (for example, ±0.12D).

[0103] The lens elements in embodiment group 2 have the following configuration. "A first lens element which is a plus lens having a predetermined positive power; A second lens element is a minus lens having a negative power obtained by combining a negative power having an absolute value equivalent to the positive power and a spherical power that is one of the prescription values; A lens element comprising: It is preferable that the following configuration is further provided. "The first lens element is a single progressive power lens that realizes the addition power of the prescription value and is a plus lens having a predetermined positive power at the starting point of progression."

[0104] In addition to the above configuration, the fact that the light guide member is flat is reflected in the lens elements as follows. "The first lens element has two major surfaces, the second lens element has two major surfaces; The above lens element, wherein one principal surface of the first lens element (the surface on the eyeball side in one embodiment of the present invention) and one principal surface of the second lens element (the surface on the object side in one embodiment of the present invention) are both flat."

[0105] One of the features of the second lens element in the embodiment group 2 is as follows. The lens element configuration that focuses on this feature is as follows. "A lens element that is a minus lens having a negative power that is a combination of a spherical power, which is one of the prescription values, and a negative power of -0.25D or less." In addition, it is preferable to have the following configuration. "The above-mentioned lens element has two principal surfaces, one of which (in one embodiment of the present invention, the object-side surface) is flat."

[0106] Regarding the group of aspects 3, the eyeglass frame having a configuration in which the first lens element and / or the second lens element is detachable from the eyeglasses is also characterized. The configuration focusing on this point is as follows. "Having an object side surface and an eyeball side surface, A spectacle lens comprising a light guiding member, a first lens element adjacent to the light guiding member on an object side, and a second lens element adjacent to the light guiding member on an eyeball side, A spectacle frame fitted with a spectacle lens, the spectacle lens realizing a prescription value of a wearer by the first lens element and the second lens element when a light beam passing through the first lens element and the second lens element is focused to obtain a real image, and the spectacle lens displays a virtual image obtained by focusing a light beam passing through the second lens element after transmitting through the light guiding member at a predetermined distance from the wearer by the second lens element, A spectacle frame comprising at least one of a first lens element holder having a mechanism for detachably mounting the first lens element and a second lens element holder having a mechanism for detachably mounting the second lens element (preferably at least the second lens element holder).

[0107] The technical ideas of the present invention are also reflected in a virtual image display system comprising the above-mentioned eyeglass lens and an image light output section that outputs image light, and in a program for causing a computer to perform the functions provided by the system. [Explanation of symbols]

[0108] 1. Eyeglass lenses 2...Light guide member 21…Side (edge) 3…First lens element 31...Object side surface of the first lens element 32...Eyeball side surface of the first lens element 4…Second lens element 41...Object side surface of the second lens element 42...Eyeball side surface of second lens element E…Eye V: Light flux of virtual image (from the image light output part) R…A beam of light of a real image (from the outside world) O: Center of pupil and center of lens

Claims

1. having an object-side surface and an eyeball-side surface, A spectacle lens including a light guiding member, a first lens element adjacent to the light guiding member on an object side, and a second lens element adjacent to the light guiding member on an eyeball side, When a light beam passing through the first lens element and the second lens element is focused to obtain a real image, the prescription value of the wearer is realized by the first lens element and the second lens element, and a virtual image obtained by focusing the light beam passing through the second lens element after transmitting through the light guiding member is displayed at a predetermined distance from the wearer by the second lens element, The first lens element is a progressive power lens that realizes an addition power that is one of the prescription values ​​of a wearer.

2. The first lens element is a progressive power lens that realizes an addition power among the prescription values, The spectacle lens of claim 1 , wherein the second lens element provides a prescription value other than an addition power.

3. The light guide member is a flat plate having two flat surfaces, the first lens element includes a progressive power lens and a plus lens, and a surface of the plus lens adjacent to the flat surface of the light guide member is flat; The spectacle lens of claim 1 , wherein the second lens element comprises a minus lens, and a surface of the minus lens adjacent to the flat surface of the light guide member is flat.

4. having an object-side surface and an eyeball-side surface, A spectacle lens including a light guiding member, a first lens element adjacent to the light guiding member on an object side, and a second lens element adjacent to the light guiding member on an eyeball side, When a light beam passing through the first lens element and the second lens element is focused to obtain a real image, the prescription value of the wearer is realized by the first lens element and the second lens element, and a virtual image obtained by focusing the light beam passing through the second lens element after transmitting through the light guiding member is displayed at a predetermined distance from the wearer by the second lens element, the first lens element comprises a plus lens having a positive power that is the reciprocal of the one predetermined distance; A spectacle lens, wherein the second lens element comprises a single functional compound lens, and the spherical power of the functional compound lens is a sum of the negative power of the reciprocal of the one predetermined distance and the spherical power of the prescription value.

5. The light guide member is a flat plate having two flat surfaces, a surface of the positive lens adjacent to the flat surface of the light guiding member is flat; The eyeglass lens according to claim 4 , wherein a surface of the functional compound lens adjacent to the flat surface of the light guiding member is flat.

6. having an object-side surface and an eyeball-side surface, A spectacle lens including a light guiding member, a first lens element adjacent to the light guiding member on an object side, and a second lens element adjacent to the light guiding member on an eyeball side, a spectacle lens in which, when a light beam passing through the first lens element and the second lens element is focused to obtain a real image, a prescription value of a wearer is realized by the first lens element and the second lens element, and a virtual image obtained by focusing a light beam passing through the second lens element after transmitting through the light guiding member is displayed at a predetermined distance from the wearer by the second lens element; Eyeglass frames and Equipped with At least one of the first lens element and the second lens element is removable.

7. The eyeglasses of claim 6 , wherein at least the second lens element is removable.

8. The eyeglasses according to claim 6 or 7, wherein the eyeglass frame comprises at least one of a first lens element holder having a mechanism for allowing the first lens element to be attached and detached, and a second lens element holder having a mechanism for allowing the second lens element to be attached and detached.

Images