Eyeglass lenses, eyeglasses, eyeglass lens design method, and eyeglass lens manufacturing method

Abstract

Provided are an eyeglass lens and technology related thereto. The eyeglass lens has an object-side face and an eyeball-side face, and is provided with a light guide member, a first lens element adjacent to the light guide member on the object side thereof, and a second lens element adjacent to the light guide member on the eyeball side thereof, wherein the prescription value of the wearer is achieved by the first lens element and the second lens element when obtaining a real image formed by the light flux passing through the first lens element and the second lens element , and an obtained virtual image formed by the light flux transmitted through the light guide member and passing through the second lens element is displayed at a predetermined distance from the wearer by the second lens element.

Description

[Technical Field]

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

[0002] Patent document 1 is known for a virtual reality and augmented reality image and visualization system, which 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 emanating 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] The technology described in Patent Document 1 employs a variable focus lens. However, when a variable focus lens is used, a special lens such as a liquid crystal lens or an electroactive lens is required.

[0005] If it were possible to allow wearers to properly experience virtual reality and / or augmented reality while using non-variable focus lenses, which are the same material as regular 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 using materials of ordinary eyeglass lenses. [Means for solving the problem]

[0007] To properly provide the above experience to a wearer with presbyopia, progressive power lenses are required. One option is for the wearer to wear eyeglass lenses that provide the above experience, or even eyeglasses with the eyeglass lenses fitted into an eyeglass frame, over the progressive power lenses that the wearer already owns. These eyeglasses will hereinafter also be referred to as "experience eyeglasses." The lenses of these eyeglasses will hereinafter also be referred to as "experience lenses."

[0008] On the other hand, the virtual image obtained by focusing the light beam transmitted through the light guide member is distorted by 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 that allow a wearer to appropriately experience virtual reality and / or augmented reality using materials that are typically used for eyeglass lenses. The aspects relating to this discovery are referred to as Aspect Group 1.

[0010] A first aspect of the present invention is having an object-side surface and an eyeball-side surface, and A spectacle lens comprising a light guiding member, a first lens element adjacent to the light guiding member on the object side, and a second lens element adjacent to the light guiding member on the 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 that is transmitted through the light guiding member and passes through the second lens element 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 achieves 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 addition power among 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 one minus lens, and the surface of the minus lens adjacent to the flat surface of the light guide member is flat.

[0013] To provide the above experience appropriately for refractive errors, the wearer can wear the experience glasses over their existing eyeglass lenses (e.g., single-vision lenses). However, this creates a gap between the wearer's existing eyeglass lenses and the experience lenses. This gap reduces the angle of view that the wearer can see.

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

[0015] A fourth aspect of the present invention is having an object-side surface and an eyeball-side surface, and A spectacle lens comprising a light guiding member, a first lens element adjacent to the light guiding member on the object side, and a second lens element adjacent to the light guiding member on the 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 that is transmitted through the light guiding member and passes through the second lens element 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 predetermined distance; The second lens element is a spectacle lens having a single functional compound lens, the spherical power of which is a value obtained by adding the negative power of the reciprocal of the 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 plus lens adjacent to the flat surface of the light guide member is flat; In the eyeglass lens according to the fourth aspect, the surface of the function composite lens adjacent to the flat surface of the light guide member is flat.

[0017] The use of a non-variable focus lens, which is made of the same material as ordinary eyeglass lenses, means that ordinary eyeglass lens materials (e.g., materials made of plastic or glass) are used. The presence or absence of refractive error and its degree vary from wearer to wearer. The distance at which the virtual image is displayed (referring to the distance from the wearer; the same applies hereinafter) also varies depending on the type of virtual image and the display situation. The use of a single non-variable focus lens means that it is not possible to accommodate the 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 that are common to 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 manufacturing a semiconductor device comprising: having an object-side surface and an eyeball-side surface, and A spectacle lens comprising a light guiding member, a first lens element adjacent to the light guiding member on the object side, and a second lens element adjacent to the light guiding member on the eyeball side, a spectacle lens that, 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 that is transmitted through the light guiding member and passes through the second lens element, at a predetermined distance from the wearer by the second lens element; eyeglass frames and Equipped with The eyeglasses are such that at least one of the first lens element and the second lens element is detachable.

[0020] A seventh aspect of the present invention is The eyeglasses according to a sixth aspect, wherein at least the second lens element is detachable.

[0021] An eighth aspect of the present invention is 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 listed below, focusing on the lens elements in each of the above groups of aspects. The following aspects may be combined with the above aspects as appropriate.

[0024] An eighth aspect of the present invention is 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 the progressive power starting point; a second lens element, which is a minus lens that realizes prescription values other than the addition power and has a negative power whose absolute value is equivalent to the positive power; A lens element comprising:

[0025] A ninth aspect of the present invention is a method for manufacturing a semiconductor device comprising: a first lens element that is a plus lens having a predetermined positive power; a second lens element that is a single functional composite lens having a power that is a combination of a negative power whose absolute value is equivalent to the positive power and a spherical power that is one of the prescription values; A lens element comprising:

[0026] A tenth aspect of the present invention is a method for manufacturing a semiconductor device comprising: The first lens element is a lens element according to the 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 manufacturing a semiconductor device comprising: 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 manufacturing a semiconductor device comprising: The lens element is a single functional composite lens having a power that combines 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 manufacturing a semiconductor device comprising: A twelfth aspect of the present invention is a lens element according to a twelfth aspect, wherein the lens element has two main surfaces, one of which is flat.

[0030] Other aspects of the present invention are listed below. The following aspects may be combined with the above aspects as appropriate.

[0031] The second lens element may achieve 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 distance at least at the lens center. In aspect group 1, the first lens element may have a progressive surface that achieves add power while maintaining the positive power at the lens center.

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

[0033] having an object-side surface and an eyeball-side surface, and A spectacle lens comprising a light guiding member, a first lens element adjacent to the light guiding member on the object side, and a second lens element adjacent to the light guiding member on the eyeball side, An eyeglass frame fitted with eyeglass lenses that, 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 that is transmitted through the light guiding member and passes through the second lens element, 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 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. [Effects of the Invention]

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

[0036] [Figure 1] FIG. 1 is a horizontal cross-sectional schematic view showing an eyeglass lens according to one embodiment of the present invention functioning as part of a virtual image display system. DETAILED DESCRIPTION OF THE INVENTION

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

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

[0039] A system according to one aspect of the present invention includes an image light output unit that outputs image light and the following eyeglass lenses. The image light output unit refers to a component that includes a light source, a projection lens, and other components necessary for outputting image light. 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 are no limitations 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 the eyeglass lenses in the smart glasses.

[0041] An 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 an eyeglass lens according to one embodiment of the present invention functions as part of a virtual image display system. Each symbol is as described in the section on symbol explanations in this specification. The symbols will not be described again 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 the portion of the surface that faces the object-side surface in the optical axis direction is the eyeball-side surface, and conversely, the 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 horizontal direction and is perpendicular to the meridian. When viewed from the wearer, 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 portion described in Patent Document 1 (specific configurations of the light source, projection lens, light guide member (or waveguide), system drive control unit, etc.) may be publicly known, and so 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 the object side, and a second lens element adjacent to the light-guiding member on the 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-guiding member on the object side. The second lens element is adjacent to the light-guiding member on the eyeball side. In this specification, "adjacent" includes a state of physical contact with the light-guiding member, and also a state of non-contact but close proximity (for example, a maximum separation distance of 8 mm, 5 mm, or 3 mm at the geometric centers of the lenses).

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

[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 formed by the light beam transmitted through the light guide 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 referred to as the "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 surface shape that allows the virtual image to be displayed at a distance of the display distance (e.g., 2 m) from the wearer. Specifically, the curved surface may be set to a concave surface with a power of 0.50 D (= 1 / (2 m)) (i.e., -0.50 D). At the same time, the first lens element may be set to +0.50 D. With this configuration, a wearer with no refractive error can properly view the outside world and properly view the virtual image at a distance of the display distance.

[0052] Incidentally, the wearer's prescription values are written on the lens bag of the eyeglass lens. This is no exception even in the case of eyeglass lenses equipped with a light guiding member, such as the eyeglass lens according to one aspect of the present invention. This is because the eyeglass lens according to one aspect of the present invention corrects refractive errors when checking the outside world, so the prescription values must be written on it. 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 as being based on the wearer's prescription. Spectacle lenses are usually packaged together with a lens bag. Therefore, the technical concept of the present invention is reflected in spectacle lenses that come with a lens bag, and the same applies to sets of lens bags and spectacle lenses.

[0054] The wearer's prescription values include, for example, the spherical power (S power) when looking straight ahead (at infinity), the astigmatism power (C power), the astigmatism axis (Ax), and the prism power (Δ). In the case of progressive power lenses, the prescription values also include the addition power (ADD). 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 that make up the first lens element. There is no limit to the number of lenses that make up the second lens element. However, since increasing the number of lenses leads to an increase in the thickness of the experimental lens, it is preferable that the lens that makes up the first lens element is a single plus lens (with a convex surface on the object side) and the lens that makes up the second lens element is a single minus lens (with a concave surface on the eyeball side). Details will be provided later.

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

[0057] <Aspect Group 1> One of the features of the first embodiment 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 section on means above, the virtual image obtained by focusing the light beam transmitted through the light guide member is distorted by the progressive effect of the progressive power lens already owned by the wearer. The solution to this problem is to provide the above-mentioned features of Aspect Group 1. The light beam associated with the virtual image does not pass through the first lens element. Focusing on this point, one of the features of Aspect Group 1 is to concentrate the progressive component of the progressive power lens in the first lens element, through which the light beam associated with the virtual image does not pass. Thanks to this feature, it is possible to correct the wearer's presbyopia while avoiding distortion of the virtual image due to the progressive effect.

[0059] The addition power of the prescription values is preferably realized by the first lens element, which is a progressive-power lens. In one specific example of the first aspect group, the object-side surface of the first lens element is a progressive surface, but 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 this 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 values other than the addition power are 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 add power is realized when the light beam, which is 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 views a real image. In this specification, using the shape of the second lens element (or its eyeball-side surface in the case of a single lens) to make the prescription values other than the add power consistent is referred to as "the prescription values other than the add power being realized by the second lens element."

[0062] As described in the paragraph above, the first lens element is also essential 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's main role is to realize the add power and to have a positive power according to the display distance at which the virtual image is located. Therefore, it is acceptable to say that "all prescription values other than the add power are realized by the second lens element" as "the first lens element does not make any special contribution that affects the realization of prescription values other than the add power."

[0063] Of course, it is possible to realize a power other than addition with the first lens element, but in that case, the progressive power lens that is the first lens element has a complex surface shape. If such a first lens element is to be 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 be a progressive power lens that realizes the addition power of the prescription value. Note that processing to reflect prescription values other than the addition power is easier than reflecting the progressive component. Therefore, there is no problem in processing the second lens element to reflect prescription values other than the addition power.

[0065] The light-guiding member is preferably flat and has two flat surfaces (main surfaces) facing each other in the lens thickness direction. The light-guiding member can also be curved. It is also possible to curve the light-guiding member into a meniscus shape. However, if the waveguide is curved, it becomes very difficult to control the formation of a virtual image. If the surface shape of the portion that covers and protects the waveguide is curved, the light-guiding 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 edge thickness is not desirable. Therefore, the light-guiding member is preferably flat.

[0066] In this specification, the term "flat plate-like" includes both a completely flat plate-like shape and an incompletely flat plate-like shape. An incompletely flat plate-like shape is also considered to be one in which a recess is provided in one of the two flat main surfaces, for example, at a portion connecting to the image light output portion that outputs the image light. As an example, a light-guiding 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-guiding member is in the same plane.

[0067] In addition, the first lens element preferably includes a single 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 preferably flat, and the second lens element preferably includes a single minus lens, and the surface of the minus lens adjacent to the flat surface of the light guiding member is preferably 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 may occur between the first lens element and the light-guiding member. In this case, the first lens element must be processed to reflect the progressive component on one surface, and it is time-consuming to process it 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. The contents of this paragraph also apply to the second lens element.

[0069] Below, a specific example will be given in which it is assumed 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 starting point is located at the lens center or directly below it. If the add power in the prescription value of a presbyopic wearer is 1.50D, the near power 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, fitting point or eye point FP, and measurement reference point N can be identified by referring to a remark chart or centration chart issued by the lens manufacturer.

[0072] The eyeball-side surface of the second lens element has a shape that reflects the prescription values other than the add power. For example, if the prescription values have an S power of -3.00D and a C power of 0.00D, the second lens element has a concave shape of -3.50D, which is the sum of -0.50D and the S power of -3.00D, to display a virtual image 2 meters away. The object-side surface of the second lens element is flat (plano). In other words, the second lens element in this example is a minus lens.

[0073] The contents described in the item of mode group 1 can be combined with other mode groups and modified examples as appropriate.

[0074] <Aspect Group 2> One of the features of 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, which is one of the prescription values. In other words, one of the features of mode group 2 is that the second lens element is integrated with a lens element that exhibits the function of displaying a virtual image at a predetermined distance and a lens element that exhibits the function of correcting the wearer's refractive error.

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

[0076] The specific configuration of mode group 2 is as follows: 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 comprises a single functional compound lens having a power that is the sum of a negative power of the reciprocal of the one predetermined distance and a spherical power that is one of the prescription values. More specifically, the spherical power of the functional compound lens is a value that is the sum of the negative power of the reciprocal of the one predetermined distance and the spherical power of the prescription value. In either case, the functional compound lens has a power that corresponds to the one predetermined distance and prescription value (spherical power, cylindrical power, cylindrical axis, prism power, etc.).

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

[0078] In the example above, a single minus lens having a negative power obtained by combining the negative power of the reciprocal of the indicated distance with a spherical power, which is one of the prescription values, was described, but the present invention is not limited to this. For example, if the S power of the prescription value is +3.00D, the surface facing the eyeball will be a convex (plus lens) with a positive power of +2.50D (=-0.50D+3.00D). Furthermore, if the S power of the prescription value is +0.50D, the surface facing the eyeball will be 0D (=-0.50D+0.50D). If the light-guiding member is flat, the second lens element will consequently include a single disk-shaped lens. The lenses included in the second lens element in such cases are collectively referred to as "functional composite lenses."

[0079] The contents described in the item of mode group 2 can be combined with other mode groups and modified examples as appropriate.

[0080] <Aspect Group 3> Aspect Group 3 focuses on eyeglasses (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 eyeglasses. Hereinafter, a case where both lens elements are detachable from the eyeglasses will be illustrated as an example, but only one of the lens elements may be detachable, or 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 section on means above, using one non-variable focus lens means that it is not possible to accommodate various situations for each wearer and virtual image. A solution to this problem is to prepare multiple types of first lens element and second lens element.

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

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

[0084] On the other hand, when mode group 1 is adopted, fewer types of semi-finished lenses need to be prepared. This is because the progressive addition lenses in mode group 1 realize the addition power among the prescription values. If the progressive addition lenses realize the addition power, the number of types of semi-finished lenses that need to be prepared can be significantly reduced compared to when 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 opposite the progressive surface of the semi-finished lens is made flat, even the effort of additional processing can be omitted.

[0086] When the second lens element is in the second mode group 2, 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 predetermined distance and a spherical power, which is one of the prescription values. A minus lens can be easily processed from a lens blank using conventional technology. If the light guide member is flat, the object-side surface of the second lens element will also be flat, making processing even easier.

[0087] There are no limitations 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 on the light guide member, but the light guide member is a precision component, even if protected, and it is not desirable to subject it to shocks each time it is attached or detached. Therefore, it is preferable to provide this mechanism on the eyeglass frame. It is preferable to provide this mechanism on 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 the 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] Another specific example of the above mechanism is, for example, a full rim is adopted in eyeglasses, which has a rim that covers the entire circumference of the eyeglass lens, and a slot with a lid is provided in the upper rim, and the light-guiding member is fixed to the rim, while the first lens element and the second lens element positioned on either side of the light-guiding member can be inserted and removed from the slot.

[0090] <Modification> Although the embodiments of the present invention have been described above, the above disclosure shows exemplary embodiments of the present invention. In other words, the technical scope of the present invention is not limited to the above exemplary embodiments, and various modifications are possible without departing from the spirit of the present invention. Furthermore, the above disclosure can be arbitrarily selected and combined with the following modifications.

[0091] Although one embodiment of the present invention has been described with an example of a C power of 0.00D, the present invention is also applicable to cases where the C power is other than this value. Specifically, the eyeball-side surface of the second lens element may be made a toric surface corresponding to the C power and the astigmatic axis Ax. Also, even if a prism power Δ is present as a prescription value, a shape corresponding to the prism power Δ may be reflected on the eyeball-side surface of the second lens element.

[0092] That is, the second lens element may achieve 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 distance at least at the lens center. In aspect group 1, the first lens element may have a progressive surface that achieves addition 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 have other shapes (for example, a toric surface or a shape corresponding to the prism power Δ).

[0094] In the first group of aspects, it is sufficient that the object-side surface of the progressive power lens included in the first lens element is an aspherical 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 are shaped to resemble the principal surface of the light-guiding member. The eyeball-side surface of the second lens element may be spherical or aspherical as long as it has a shape that achieves prescription values other than the addition power.

[0095] In the group 2 of aspects, the object-side surface of the plus lens included in the first lens element may be an aspherical progressive surface, as in the group 1 of aspects, or may be spherical. The surface of the first lens element adjacent to the light-guiding member (e.g., the eyeball-side surface of the plus lens) and the surface of the second lens element adjacent to the light-guiding member (e.g., the object-side surface of the functional composite lens) may have shapes that follow the principal surfaces of the light-guiding member. The eyeball-side surface of the functional composite lens may be spherical or aspherical as long as it has a power that is a combination of a negative power corresponding to the viewing distance and a spherical power. As with the second lens element in the group 1 of aspects, there is no limitation on the shape of the eyeball-side surface of the functional composite lens as long as the prescription values can be made consistent using the shape of the eyeball-side surface of the functional composite lens. In the group 2 of aspects, all prescription values, including the addition power, may be realized by the functional composite lens.

[0096] In the embodiment group 1, the first lens element has a progressive refractive power Although the case where a lens is included has been described, other functional lenses (for example, photochromic lenses) may be provided together with or instead of the progressive power lenses.

[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 include 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 displays a virtual image at a predetermined distance and a lens element that corrects the wearer's refractive error. Also, the first lens element and / or the second lens element do not need to be detachable from the eyeglasses.

[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, the feature group 3 does not need to have the features of the feature groups 1 and 2.

[0100] However, as described in the section on 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 section on each mode group.

[0101] As described in the items common to Aspect Groups 1 to 3, one feature of one aspect of the present invention is that the variable focus lens described in Patent Document 1 is replaced with a non-variable focus lens. Therefore, the technical concept of the present invention is also reflected in the lens elements employed in each of the aspect groups.

[0102] The configuration of the lens elements in the embodiment group 1 is as follows. "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 progressive start point; a second lens element, which is a minus lens that realizes prescription values other than the addition power and has a negative power whose absolute value is equivalent to the positive power; A lens element comprising: In this specification, "powers with 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 spectacle lenses (for example, ±0.12D).

[0103] The configuration of the lens elements in the embodiment group 2 is as follows. "A first lens element which is a plus lens having a predetermined positive power; a second lens element that 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 be 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 progressive power starting point."

[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 mode group 2 is that the lens element has the following configuration, which takes this into consideration. "A lens element that is a single minus lens with a negative power that combines a spherical power, which is one of the prescription values, with 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 is also characterized by a configuration in which the first lens element and / or the second lens element is detachable from the eyeglasses. The configuration focusing on this point is as follows. "Having an object side surface and an eyeball side surface, and A spectacle lens comprising a light guiding member, a first lens element adjacent to the light guiding member on the object side, and a second lens element adjacent to the light guiding member on the eyeball side, An eyeglass frame fitted with eyeglass lenses that, 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 that is transmitted through the light guiding member and passes through the second lens element, 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 detachably attaching the first lens element and a second lens element holder having a mechanism for detachably attaching the second lens element (preferably at least the second lens element holder).

[0107] The technical concept of the present invention is also reflected in a virtual image display system comprising 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. [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 second lens element 42...eyeball-side surface of second lens element E…Eye V: Light flux of virtual image (from the image light output section) 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, and 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 light beam passing through the first lens element and the second lens element is focused on a retina to obtain a real image, and a light beam transmitted through the light guiding member and passing through the second lens element is focused on a retina to obtain a virtual image, the second lens element comprises a single functional composite lens that integrates a lens element that exhibits a function of displaying the virtual image at a position a predetermined distance away from the wearer and a lens element that exhibits a function of correcting refractive error of the wearer, The spherical power of the functional composite lens is a value obtained by adding together the spherical power of the prescription value of the wearer (excluding those having a value of 0D) and an additional power (excluding those having a value of 0D) for displaying the virtual image at a position that is the predetermined distance away from the wearer, the first lens element comprises a plus lens having a power of the opposite sign to the additional power; A spectacle lens in which, when a light beam passing through the first lens element and the second lens element is focused on the retina to obtain a real image, the first lens element and the second lens element realize the prescription value of the wearer, and, when a light beam transmitted through the light-guiding member and passing through the second lens element is focused on the retina of a wearer who requires vision correction according to the prescription value to obtain a virtual image, the second lens element allows the wearer to view the virtual image as being located at a location that is the predetermined distance away.

2. the light guide member is a flat plate having two flat surfaces, a surface of the plus lens adjacent to the flat surface of the light guide member is flat; The eyeglass lens according to claim 1 , wherein the surface of the functional composite lens adjacent to the flat surface of the light guide member is flat.

3. The eyeglass lens according to claim 1 or 2; eyeglass frames and Equipped with At least one of the first lens element and the second lens element is detachable.

4. The eyeglasses of claim 3 , wherein at least the second lens element is removable.

5. 4. The eyeglasses according to claim 3, wherein the eyeglass frame comprises at least one of a first lens element holder having a mechanism for detachably attaching the first lens element and a second lens element holder having a mechanism for detachably attaching the second lens element.

6. having an object-side surface and an eyeball-side surface, and 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 light beam passing through the first lens element and the second lens element is focused on a retina to obtain a real image, and a light beam transmitted through the light guiding member and passing through the second lens element is focused on a retina to obtain a virtual image, the second lens element comprises a single functional composite lens that integrates a lens element that exhibits a function of displaying the virtual image at a position a predetermined distance away from the wearer and a lens element that exhibits a function of correcting refractive error of the wearer, The spherical power of the functional composite lens is a value obtained by adding together the spherical power of the prescription value of the wearer (excluding those having a value of 0D) and an additional power (excluding those having a value of 0D) for displaying the virtual image at a position that is the predetermined distance away from the wearer, the light guide member is a flat plate having two flat surfaces, the first lens element includes a plus lens having a power with an opposite sign to the additional power, and a surface of the plus lens adjacent to the flat surface of the light guide member is flat; the second lens element includes a minus lens, and a surface of the minus lens adjacent to the flat surface of the light guide member is flat; A method for designing eyeglass lenses, the method comprising: when a light beam passing through the first lens element and the second lens element is focused on a retina to obtain a real image, a prescription value of the wearer is realized by the first lens element and the second lens element; and when a light beam transmitted through the light guiding member and passing through the second lens element is focused on a retina of a wearer who requires vision correction according to the prescription value to obtain a virtual image, the second lens element allows the wearer to visually recognize the virtual image as being located at a position a predetermined distance away, a step 1 of setting a shape of a surface of the second lens element facing the surface adjacent to the flat surface of the light guiding member and facing the eyeball of the eyeglass lens to a curved surface shape having a negative dioptric power that can display the virtual image at a position separated by the predetermined distance; a step 2 of setting the shape of a surface of the first lens element facing the surface adjacent to the flat surface of the light guiding member and facing the object side of the eyeglass lens to a curved surface shape having a positive power whose absolute value is equal to the negative power; a step 3 of resetting the shape of a surface of the second lens element that faces a surface adjacent to the flat surface of the light guiding member so as to match the negative power with a spherical power that is one of the prescription values; A method for designing a spectacle lens, comprising:

7. A method for manufacturing a spectacle lens, which manufactures a spectacle lens designed by the spectacle lens design method according to claim 6.

Images