JP2019117338A - Spectacle lens, head mount display, lens blank and semifinished lens blank - Google Patents

Abstract

To provide a technique of enhancing a degree of freedom in a shape of a spectacle lens with an optical portion of an HMD formed as the spectacle lens, while reducing a difference of views between video light and environment light due to a shape of the spectacle lens.SOLUTION: A spectacle lens includes a face on an object side, a face on an eyeball side, and a side face. The spectacle lens further includes a lens body and a light guide member. The face on the eyeball side is entirely composed of a lens body. At least part of the face on the eyeball side is a curved surface part. A difference is 0.50D or less with regard to: a power of the spectacle lens to a wearer's eye when video light is incident from the face on the eyeball side or the side face of the spectacle lens, progresses along the light guide member, and exits from the curved surface part of the face on the eyeball side; and a power of the spectacle lens to the wearer's eye when environment light is incident from the face on the object side, and exits from the curved surface part of the face on the eyeball side. Techniques related thereto are also provided.SELECTED DRAWING: Figure 2

Description

  The present invention relates to spectacle lenses, head mounted displays, lens blanks and semi-finished lens blanks.

  As a head mounted display (hereinafter, also referred to as an HMD), there is known a display provided with a see-through function for overlapping and displaying external light and image light (for example, Patent Document 1).

JP, 2014-170094, A

  In Patent Document 1, as an order in which the image light from the image element is transmitted, it is an image light emitting part, a projection lens, and a light guide member (FIG. 2 of Patent Document 1). In addition, the transparent member which assists a fluoroscopic function is connected in the form which is in series with a light guide member (FIG. 2 of patent document 1).

  In the HMD described in Patent Document 1, the shape of a portion (hereinafter referred to as an optical portion) disposed at the position of the lens in the glasses has a great influence on the shape of the light guide member. This is because the shape of the transmitting member connected to the light guide member is also determined along the shape of the light guide member.

  If it is necessary to change the shape of the optical part, it is also necessary to change the shape of the light guide member, and then the light guide path of the image light is also required to be changed, and a large scale design change is required. Therefore, the degree of freedom of the shape of the optical portion of the HMD described in Patent Document 1 is not high.

  On the other hand, in recent years, in the HMD as well as the spectacle lens, there is a tendency to emphasize the appearance. Therefore, it is necessary to increase the degree of freedom in the shape of the optical part of the HMD.

  In addition to the demand for increasing the degree of freedom, the following findings were obtained by the present inventors. This finding will be described with reference to FIG. FIG. 1 is a schematic horizontal cross-sectional view for explaining a mechanism that causes a problem when the optical portion 100 is in a meniscus shape. FIG. 1 is the case of the left eye (FIGS. 2 to 5 are also the cases of the left eye).

  A relatively good appearance in the optical portion 100 includes a meniscus shape as shown in FIG. The meniscus shape refers to a shape in which the surface 200 on the object side is entirely convex and the surface 300 on the eye side is generally concave.

  However, if the optical portion 100 is formed into a meniscus shape indiscriminately, the following problems occur.

In FIG. 1, the image light (solid arrow) emitted from the light source 600 is incident from the concave eyeball side surface 300, travels through the light guide member 500, and is emitted from the concave eyeball side surface 300 again. That is, the image light passes through a negative lens whose both surfaces are concave.
On the other hand, in FIG. 1, ambient light (broken line arrows) is incident from the convex object side surface 200 and is emitted from the concave eye surface 300. In other words, ambient light passes through the meniscus lens.
At this time, since the refractive powers of the image light incident on the eye E of the wearer of the HMD and the external light to the eye E are different from each other, the visual light and the external light have different appearances. Or there is a problem that can not be seen in focus.

  Therefore, according to the present invention, the optical part of the HMD is a spectacle lens, and while the degree of freedom of the shape of the spectacle lens is increased, the difference in appearance between the image light and the external light derived from the shape of the spectacle lens It aims at providing the technology to reduce.

The present invention has been made to achieve the above object.
The first aspect of the present invention is
An eyeglass lens having a surface on the object side, a surface on the eyeball side, and a side surface,
It has a lens body and a light guide member,
The entire surface on the eyeball side is constituted by the lens body, and at least a part of the surface on the eyeball side is a curved surface portion,
When the image light is incident from the eyeball side surface or the side surface of the eyeglass lens, travels through the light guide member, and exits from the curved surface portion of the eyeball side surface, the power of the eyeglass lens with respect to the wearer's eye It is an eyeglass lens which has a difference of not more than 0.50 D from the power of the eyeglass lens with respect to the eye of the wearer when entering from the side surface and emitting from the curved surface portion of the surface on the eyeball side.

A second aspect of the present invention is the aspect according to the first aspect, wherein
When the ambient light is incident from the object-side surface and exits from the curved surface portion of the eye-side surface, the power of the spectacle lens with respect to the wearer's eye is not zero.

A third aspect of the present invention is the aspect according to the first or second aspect, wherein
The difference between the curvature of the object-side surface and the curvature of the portion of the eye-side surface or side on which the image light is incident is 0.15 D or less as the refractive power.

A fourth aspect of the present invention is the aspect according to any one of the first to third aspects, wherein
The spectacle lens has a meniscus shape.

The fifth aspect of the present invention is
A head mounted display comprising: an eyeglass lens having a surface on the object side, a surface on the eyeball side, and a side surface, and an image light emitting unit that emits image light,
The spectacle lens has a lens body and a light guide member,
The entire surface on the eyeball side is constituted by the lens body, and at least a part of the surface on the eyeball side is a curved surface portion,
An eyeglass lens for the eye of the wearer when the image light emitted from the image light emitting portion is incident from the surface on the eyeball side or the side surface of the eyeglass lens, travels through the light guide member, and exits from the curved portion of the surface on the eyeball side A head mount having a difference of not more than 0.50 D between the dioptric power of the lens and the dioptric power of the spectacle lens with respect to the eye of the wearer when external light is incident from the surface on the object side and exits from the curved portion of the surface on the eye It is a display.

A sixth aspect of the present invention is the aspect according to the fifth aspect, wherein
When the ambient light is incident from the object-side surface and exits from the curved surface portion of the eye-side surface, the power of the spectacle lens with respect to the wearer's eye is not zero.

The seventh aspect of the present invention is
A lens blank for an eyeglass lens having an object side planned surface before the object side surface is processed, an eyeball side planned surface before the eyeball side surface is processed, and a side surface planned surface sandwiched between both surfaces And
A lens blank body and a light guide member capable of reaching image light;
The entire eyeball side planned surface is constituted by the lens blank body,
The object side planned surface and the eyeball side planned surface are lens blanks having convex shapes.

An eighth aspect of the present invention is the aspect described in the seventh aspect, wherein
The difference between the curvature of at least one of the curvature on the object side planned surface and the curvature on the side planned surface and the curvature on the eyeball side planned surface is 0.15 D or less in refractive power.

The ninth aspect of the present invention is
It is a semi-finished lens blank for an eyeglass lens having a surface on the object side, a planned surface on the side of the eyeball before the processing on the surface on the eyeball side, and a side scheduled surface sandwiched between both surfaces,
A semi-finished lens blank body and a light guide member capable of reaching image light;
The entire eyeball side planned surface is constituted by the lens blank body,
The object side surface and the eyeball side planned surface are semi-finished lens blanks having convex shapes.

A tenth aspect of the present invention is the aspect according to the ninth aspect, wherein
The difference between the curvature of at least one of the surface on the object side and the curvature on the side surface and the curvature on the eye surface side is 0.15 D or less in refractive power.

  Hereinafter, another aspect of the present invention will be mentioned. You may combine suitably each said aspect with respect to the following aspect.

Hereinafter, another aspect of the present invention is
An eyeglass lens having a surface on the object side, a surface on the eyeball side, and a side surface,
A lens body and a light guide member for guiding image light incident from the surface on the eyeball side or the side surface of the eyeglass lens to be emitted from the surface on the eyeball side;
It is an eyeglass lens in which the power of the eyeglass lens with respect to the eye of the wearer is not zero when external light enters from the surface on the object side and exits from the curved surface portion on the surface on the eyeball side.

  According to the present invention, the optical part of the HMD is a spectacle lens, and while the degree of freedom of the shape of the spectacle lens is increased, the difference in appearance between the image light and the external light derived from the shape of the spectacle lens Can be reduced.

It is a horizontal cross-section schematic explaining the mechanism in which a subject arises when an optical part is made into meniscus shape. It is a horizontal cross-sectional schematic diagram which shows that the spectacles lens and spectacles lens of this embodiment function as a part of HMD. The eyeglass lens and the eyeglass lens according to the present embodiment are part of the HMD after providing a step that divides the concave curved surface portion provided on the eyeball side and the convex shape where the image light is incident. FIG. 2 is a horizontal cross-sectional schematic showing functioning. It is an eyeglass lens which enables implementation of a positive prescription power, and is a horizontal cross-sectional schematic diagram which shows that an eyeglass lens functions as a part of HMD. It is an eyeglass lens which enables implementation of a minus prescribed diopter, and is a horizontal cross section schematic diagram showing that an eyeglass lens functions as a part of HMD. It is the horizontal cross-section schematic which shows the lens blank of this embodiment.

  Hereinafter, embodiments of the present invention will be described.

  The head mounted display in the present embodiment includes an image light emitting unit that emits image light, and the following spectacle lens. The video light emitting unit refers to a light source, a projection lens, or the like having a configuration necessary to emit video light.

  A major feature of the present embodiment is that the optical part in the patent document 1 is a spectacle lens, which is a related technology of a spectacle lens. For example, as the configuration (the light source, the projection lens, the specific configuration of the light guide member, the drive control unit of the HMD, etc.) other than the technology related to the optical part mentioned in Patent Document 1, a known one may be adopted. Therefore, the details are omitted.

  Hereinafter, the expression “frequency of image light” may be used, but to be precise, “image light is incident from the surface or side of the eyeball side, and propagates through the light guide member, and the curved surface portion of the surface on the eyeball side Of the eyeglass lens with respect to the wearer's eye when emitting from the The expression "frequency of external light" is "the frequency of the spectacle lens with respect to the eye of the wearer when external light is incident from the surface on the object side and exits from the curved portion of the surface on the eye side".

  The spectacle lens 1 of this embodiment is demonstrated based on FIG. FIG. 2 is a schematic horizontal cross-sectional view showing that the spectacle lens 1 and the spectacle lens 1 of the present embodiment function as part of the HMD. In FIG. 2, the solid line indicates image light and the broken line indicates external light, and the same applies in the drawings of the present specification.

  The spectacle lens 1 of the present embodiment has a see-through function, and has a surface 2 on the object side and a surface 3 on the eyeball side. A side surface 4 (hereinafter also referred to as an edge) of the spectacle lens 1 is sandwiched between the surface 2 on the object side and the surface 3 on the eyeball side. The spectacle lens 1 comprises a lens body 1 a and a light guide member 5. In the present specification, the object-side surface 2 and the eyeball-side surface 3 face each other, and the portion of the surface facing the optical axis direction as viewed from the object-side surface 2 is the eyeball-side surface 3 Conversely, the portion of the surface facing in the optical axis direction as viewed from the surface 3 on the eyeball side is the surface 2 on the object side.

  The "lens main body 1a" referred to herein means a configuration other than the light guide member 5, and is mainly composed of a lens substrate (plastic or glass) which is easy to process, for example, a transmissive member as described in Patent Document 1, It includes a hard coat layer and the like provided on the spectacle lens 1. In addition, although the attachment which can be attached or detached with respect to the spectacle lens 1 is not included as a definition of the lens main body 1a, it does not prevent actually providing cover attachments, such as a shade, with respect to the spectacle lens 1 of this embodiment.

  The positional relationship between the lens body 1a and the light guide member 5 is not particularly limited as long as the entire surface 3 on the eyeball side is formed by the lens body 1a.

  For example, a completely embedded type housed inside the lens body 1a may be adopted so as to cover the entire light guide member 5, or at least one of the side surface 4 of the spectacle lens 1 and the surface 2 on the object side A semi-embedded type in which 5 is exposed may be adopted. In the case of the semi-embedded type, the light guide member 5 is housed in a portion in which a part of the lens main body 1a which originally constitutes the contour shape of the entire eyeglass lens 1 is notched. In other words, the light guide member 5 constitutes at least one of the shapes of the light guide members 5. In other words, the light guide member 5 is exposed at the part.

  In view of the height of the degree of freedom of the shape of the spectacle lens 1, it is preferable that the exposure of the light guide member 5 is only the side surface 4 in the semi-embedded type. Furthermore, the all-embedded type in which the light guide member 5 is not exposed at all is more preferable. In the totally embedded type, the surface 2 on the object side and the surface 3 on the eyeball side are constituted by the lens main body 1a (lens base material that is easy to process), and the degree of freedom of the shape of the spectacle lens 1 is increased.

  In addition, by processing the surface 3 on the eyeball side of the spectacle lens 1 at that time, it is possible to obtain the spectacle lens 1 capable of realizing the prescribed dioptric power when the wearer is myopia or hyperopia. At that time, not only the surface 3 on the eyeball side but also the surface 2 on the object side may be processed.

  As described above, although Patent Document 1 describes an HMD having a see-through function, the positive and negative refractive powers when external light passes through the optical part are offset, and the external light is in the eye E of the wearer. There is no power at the time of arrival, and the optical part of Patent Document 1 does not have the function of refractive correction ([0050] of Patent Document 1).

  Since the refractive correction can not be performed with the optical part of the HMD having the see-through function as described in Patent Document 1, the auxiliary mounting member (for example, JP-A-2014-174366) for the wearer who needs prescription power by myopia or hyperopia I had no choice but to wear it.

However, with the spectacle lens 1 of the present embodiment, as described above, it is possible to obtain the spectacle lens 1 capable of realizing the prescribed dioptric power, so that the spectacle lens 1 can exhibit the function as a HMD having a see-through function And, the prescribed frequency can be realized. The configuration of the spectacle lens 1 focusing on the above effects is as follows.
"A spectacle lens having a surface on the object side, a surface on the eyeball side, and a side surface,
A lens body and a light guide member for guiding image light incident from the surface on the eyeball side or the side surface of the eyeglass lens to be emitted from the surface on the eyeball side;
An eyeglass lens wherein the power of the eyeglass lens with respect to the eye of the wearer is not zero when external light is incident from the object side surface and exits from the curved surface portion of the eye side surface. "

  In this specification, the prescription power is "the power of the spectacle lens with respect to the wearer's eye is not zero when external light is incident from the object-side surface and exits from the curved surface of the eye-side surface". It refers to a state other than zero, and indicates that a prescribed non-zero frequency is realized by the shape of the surface 2 on the object side and the shape of the curved surface portion 3a of the surface 3 on the eyeball side.

  However, the spectacle lens 1 of the present embodiment is not limited to the one that realizes a non-zero prescription power. For example, the spectacle lens 1 of one eye has a prescription power of zero while the spectacle lens 1 of the other eye is It may be a prescribed frequency other than zero.

  The image light from the image light emitting unit 6 may be incident from the surface 3 on the eyeball side, or may be incident from the side surface 4. In the present embodiment, the case where the image light is incident from the surface 3 on the eyeball side is mentioned, but in the case where the image light is incident from the side surface 4, the semi-embedded type In the case of adopting the above, the image light may be directly incident on the light guide member 5. In that case, it is preferable to set the difference between the curvature of the portion of the light guide member 5 to which the image light directly enters and the curvature of the surface 3 on the object side to be 0.15 D or less in refractive power (see paragraphs 0048 and 0049).

  As for the surface 3 on the eyeball side of the spectacle lens 1 of the present embodiment, as described above, the surface 3 on the eyeball side is constituted by the lens main body 1a. That is, the light guide member 5 is not exposed in the eyeball side surface 3 of the spectacle lens 1 of the present embodiment, and the entire eyeball side surface 3 is formed by the lens main body 1a. By adopting this configuration, the entire surface 3 on the eyeball side can be freely processed, and the degree of freedom of the shape of the spectacle lens 1 in the HMD can be enhanced.

  Then, at least a part of the surface 3 on the eyeball side of the spectacle lens 1 of the present embodiment is taken as a curved surface portion 3a. The image light and the ambient light from the image light emitting unit 6 finally pass through the curved surface portion 3a and reach the eye E of the wearer. At this time, in the eyeglass lens 1 of the present embodiment, the image light from the image light emitting unit 6 is incident from the surface 3 or the side 4 on the eyeball side, and travels through the light guide member 5. The power of the spectacle lens 1 with respect to the wearer's eye E at the time of emission from the portion 3a and external light are incident from the surface 2 on the object side and emitted from the curved surface portion 3a of the surface 3 on the eyeball side The difference between the power of the spectacle lens 1 and the power of the eye E of the lens E is 0.50 D or less.

  The reason why the frequency difference is set to 0.50 D or less is that the external light may be from infinity, while the image light may be seen in front of it. However, even if the intentional change of the image light is taken into consideration and the difference in the appearance between the image light and the ambient light derived from the shape of the spectacle lens 1 is further taken into consideration, the above-mentioned difference in power is 0. The eyeglass lens 1 having a size of 50 D or less is novel as far as the present inventor knows, and this configuration can reduce the difference in appearance between image light and ambient light derived from the shape of the eyeglass lens 1. In addition, 0.40 D or less is preferable and, as for the said frequency difference, 0.25 D or less is more preferable.

  In addition, as a specific method for making the image light visible in the foreground, the image light from the image light emitting unit 6 is made to pass through another lens and the power is added. There is a method of causing the image light to be incident on the spectacle lens 1. In addition, another lens may be embedded in the optical path of the image light in the inside of the spectacle lens 1 or a configuration may be provided in which the light guide member 5 has a power.

  In the eyeglass lens 1 of the present embodiment, the dioptric power difference between the image light derived from the shape of the eyeglass lens 1 and the ambient light other than the power related to the intentionally changed image light is 0.15 D or less It is preferable to The dioptric power difference between the image light derived from the shape of the spectacle lens 1 and the external light is the curvature of the surface 2 on the object side and the portion 3b to which the image light is incident on the surface 3 or the side 4 on the eyeball side. It is the value which made the refractive power the difference with the curvature of. When the surface 2 on the object side is flat, the curvature is considered to be zero.

  As described above, both the image light and the external light pass through the curved surface portion 3a of the surface 3 on the eyeball side. Therefore, the curvature of the surface 2 on the object side where external light is incident and the curvature of the portion 3b (part of the surface 3 on the eye side in the present embodiment) on which the image light is incident on the surface 3 or the side 4 on the eye If the difference is small, the frequency difference between the image light and the ambient light finally reaching the eye E of the wearer will be small. The difference between the two curvatures is more preferably 0.10 D or less, more preferably 0.05 D or less in terms of refractive power. Theoretically the most preferable is to equalize both curvatures.

  The shape of the surface 3 on the eyeball side is not particularly limited as long as the curved surface portion 3a is present, and as shown in FIG. 2, in the present embodiment, the curved surface portion 3a has a concave shape while the portion 3b on which the image light is incident It may be partially convex, and the difference in curvature with the surface 2 on the object side may be made to fall within 0.15 D in terms of refractive power. In addition, although the curved surface part 3a and the said convex shape are connected smoothly in FIG. 2, you may connect between both by a level | step difference (edge). Furthermore, as shown in FIG. 3, you may provide the level | step difference which divides the curved-surface part 3a and the said convex shape. FIG. 3 shows the eyeglass lens and the eyeglasses of the present embodiment after providing a step that divides the concave curved surface portion 3a provided on the surface 3 on the eyeball side and the convex shape which is the portion 3b on which image light is incident. FIG. 5 is a schematic horizontal cross-sectional view showing that the lens functions as part of the HMD.

  The reason why the shape of the surface 3 on the eyeball side can be freely set as shown in FIG. 2 and FIG. 3 is that the entire surface 3 on the eyeball side is configured by the lens main body 1a that can be easily processed. It does not.

  The shape of the surface 2 on the object side is not particularly limited, but the appearance of the spectacle lens 1 is better when it is a meniscus shape. Therefore, the curved surface portion 3a of the surface 3 on the eyeball side may be concave, and the surface 2 on the object side may be convex. The meniscus shape is “the surface 2 on the object side is entirely convex (half or more of the area, preferably 80% or more of the area), and the surface 3 on the eyeball side is generally (half of the area The above refers to the “shape in which 80% or more of the area preferably has a concave shape”.

  The design of the shape of the light guide member 5 in the present embodiment corresponds to the shape of the surface 2 on the object side (= the shape of the portion 3 b where the image light is incident on the surface 3 on the eyeball side). However, in the case of Patent Document 1, since the light guide member 5 is provided as a part of the optical portion at the end of the optical portion, the shape of the light guide member 5 and the shape of the transmissive member connected thereto are mutually different. Although it has been influenced, in the present embodiment, at least the surface 3 on the eyeball side is constituted by the lens body 1a, and there is no limitation to that. Therefore, it is sufficient to prepare about three base curve sections of the lens blank 10 (FIG. 6) described later, and to prepare about three types of design of the light guide member 5 accordingly.

  As shown in FIG. 2, the curved surface portion 3a of the surface 3 on the eyeball side has a concave shape, while the surface 2 on the object side has a convex shape even when the portion 3b on which the image light is incident has a partial convex shape. The spectacle lens 1 shown in FIG. 2 may be called a lens having a meniscus shape (i.e., a meniscus lens) because the entire surface 3 on the eyeball side is a concave curved surface portion 3a. .

  Furthermore, as long as the above conditions are satisfied, the shape of the surface 2 on the object side and the shape of the surface 3 on the eyeball side may be arbitrary, or may be a shape that realizes the prescription power of the wearer. It may be shaped to enhance fashion. For example, a shallow curve or a deep curve may be adopted according to the design of the HMD and the preference of the wearer. Such freedom of selection can be ensured, as described above, as a result of increasing the degree of freedom of the shape of the spectacle lens 1 of the HMD according to the present embodiment. Moreover, the difference in the appearance between the image light and the ambient light derived from the shape of the spectacle lens 1 can also be reduced.

  Incidentally, the convex shape and the concave shape in the present specification may be assumed to be spherical or toric. It is possible to make at least a part of both shapes aspheric, but in view of the spectacle lens 1 used in the HMD, it is easy to process both shapes into a spherical or toric shape. Further, unless otherwise specified, when the surface 2 on the object side is a curved surface, it uniformly refers to a spherical surface or toric (basically a spherical surface), and the curved surface portion 3a of the surface 3 on the eyeball surface is also uniformly spherical or toric It basically refers to (a spherical surface). For example, it is conceivable that the surface 2 on the object side has a spherical surface and the surface 3 on the eyeball side has a toric shape, but the present invention is not limited to this shape. The present invention is not limited to the fact that the surface 3 has a uniform spherical or toric shape.

  An example of the shape of the surface 2 on the object side and the shape of the surface 3 on the eyeball side is shown below.

  FIG. 4 is an eyeglass lens capable of realizing a positive prescription power, and is a schematic horizontal cross-sectional view showing that the eyeglass lens functions as a part of the HMD. In order to realize a positive prescription frequency, the curved surface portion 3a of the surface 3 on the eyeball side is processed into a convex shape, while the surface 2 on the object side is processed into a flat plate. The portion of the surface 3 on the eyeball side where the image light is incident is processed into the same shape as the surface 2 on the object side, that is, a flat plate. In this case, the image light emitted from the image light emitting portion 6 passes through the flat portion of the surface 3 on the eyeball side, the light guide member 5, and the convexly curved surface portion 3a of the surface 3 on the eyeball side. The frequency of arrival is theoretically equal to the frequency of external light reaching the eye E through the surface 2 on the object side and the convexly curved surface portion 3a of the surface 3 on the eyeball side. Because both of them are in the order of flat plate and convex, the shape of the surface 2 on the object side and the portion 3b on which the image light is incident on the surface 3 on the eyeball side are both flat and the difference in curvature is theoretically zero. It is because there is.

  Another example of the shape of the surface 2 on the object side and the shape of the surface 3 on the eyeball side is shown below.

  FIG. 5 is an eyeglass lens capable of realizing a minus prescribed dioptric power, and is a schematic horizontal cross-sectional view showing that the eyeglass lens 1 functions as a part of the HMD. In order to realize a negative prescription frequency, the curved surface portion 3a of the eye-side surface 3 is processed into a concave shape, while the object-side surface 2 is processed into a flat plate. The portion of the surface 3 on the eyeball side where the image light is incident is processed into the same shape as the surface 2 on the object side, that is, a flat plate. In this case, the image light emitted from the image light emitting portion 6 passes through the flat portion of the surface 3 on the eyeball side, the light guide member 5, and the concavely curved surface portion 3a of the surface 3 on the eyeball side. The power at the time of arrival and the power at the time when external light reaches the eye E sequentially through the surface 2 on the object side and the concave curved surface portion 3a of the surface 3 on the eyeball side are theoretically equal. Because both of them are sequentially in the form of a flat plate and a concave shape, the shape of the surface 2 on the object side and the portion 3b on which the image light is incident on the surface 3 on the eyeball side are both flat and the difference in curvature is theoretically zero. It is because there is.

  In the present embodiment, the spectacle lens 1 and the HMD using the same are mainly described. The technical idea of the present invention is also reflected in the lens blank and the semi-finished lens blank on which the spectacle lens 1 is based. A lens blank is a material for lens manufacture before surface processing of a lens. The semi-finished lens blank is one of the object side planned surface of the lens blank (i.e., the processed surface on the object side before facing) and the eyeball side (i.e., the processed surface on the eyeball before processing). Only refers to the optically finished plastic-based lens blank.

  Hereinafter, a lens blank and a semi-finished lens blank for producing the spectacle lens 1 of the present embodiment will be described. Matters that are not described in particular are as described above for the spectacle lens 1. The lens blank "body" in the lens blank and the semi-finished lens blank "body" in the semi-finished lens blank described below are the same as the contents described in the definition of the lens "body", except for the light guide member 5. The term “configuration” refers to a lens substrate (plastic or glass) that is easy to process.

  FIG. 6 is a schematic horizontal cross-sectional view showing the lens blank 10 of the present embodiment. The lens blank 10 of the present embodiment includes the object side planned surface 20 before the object side surface is processed, the eyeball side planned surface 30 before the eyeball side surface is processed, and the side planned surface 40. Have. The side surface planned surface 40 (also referred to as an edge) of the lens blank 10 is sandwiched between the object side planned surface 20 and the eyeball side planned surface 30. And the lens blank 10 of this embodiment has the lens blank main body 10a and the light guide member 5 which can transmit imaging light. And the whole of the eyeball side plan surface 30 is comprised by the lens blank main body 10a.

  And in lens blank 10 of this embodiment, object side plan surface 20 and eyeball side plan surface 30 have convex shape. The reason is that the shape of the surface 2 on the object side and the surface 3 on the eye side, as shown in the examples of the shape of the surface 2 on the object side and the shape of the surface 3 on the eye side mentioned above. The degree of freedom of the shape is high, and the object-side surface 2 can be processed into a flat shape, a convex shape, a concave shape, or various shapes. As described above, in the lens blank 10 of the present embodiment, the entire surface of the object side scheduled surface 20 has a convex shape in order to correspond to processing into various shapes. Even in the eyeball side planned surface 30, the entire surface is formed in a convex shape for the same reason. In this way, by adjusting the amount of cutting on the object side planned surface 20 and the eyeball side planned surface 30, it becomes possible to process not only the convex shape but also the flat shape and the concave shape.

  The lens blank 10 having the lens blank main body 10a and the light guide member 5, the entire eyeball side planned surface 30 is constituted by the lens blank main body 10a, and the object side planned surface 20 and the eyeball side planned surface 30 have a convex shape is This is a configuration that can be conceived only after the technical idea of the present invention as described above is reflected.

  The semi-finished lens blank of the present embodiment is a lens blank of a plastic substrate obtained by optically finishing only the object side planned surface 20 of the lens blank 10 in FIG. The semi-finished lens blank of the present embodiment has a surface 2 on the object side, a surface 30 on the side of the eye, and a surface 40 on the side. The side plan surface 40 (also referred to as an edge) of the semi-finished lens blank is sandwiched between the object side surface 2 and the eye side plan surface 30. The semi-finished lens blank of this embodiment has a semi-finished lens blank main body and a light guide member 5 capable of reaching image light, and the entire eyeball side planned surface 30 is formed of the semi-finished lens blank main body Ru. In addition, in the semi-finished lens blank of the present embodiment, the object-side surface 2 and the eyeball side scheduled surface 30 have a convex shape, and the technical idea of the present invention is reflected.

  In addition, it is preferable that the difference with the curvature of the portion 3b on which the image light is incident on the surface 3 or the side 4 on the eyeball side of the spectacle lens 1 is 0.15 D or less in refractive power. In the stage of 10 or semi-finished lens blank, the curvature of at least one of the curvature of the object side planned surface 20 (the object side surface 2 in the case of the semi-finished lens blank) and the side planned surface 40 in the case of the semi-finished lens blank The difference between the curvature and the curvature is preferably 0.15 D or less, more preferably 0.10 D or less, still more preferably 0.05 D or less, and most preferably equalize the two curvatures.

DESCRIPTION OF SYMBOLS 1 ... Eyeglass lens 1a ... Lens main body 2 ... Surface by the side of an object 3 ... Surface by the side of an eye 3a ... Curved part 3b ... The part into which an image light enters 4 ..
5 ... light guide member 6 ... image light emitting part 10 ... lens blank 10a ... lens blank main body 20 ... object side planned surface 30 ... eyeball side planned surface 40 ... side surface planned surface (edge)
DESCRIPTION OF SYMBOLS 100 ... Optical part 200 ... Surface of the object side of an optical part 300 ... Surface of the eyeball side of an optical part 500 ... Light guide member 600 ... Light source E ... Eye

Claims (10)

An eyeglass lens having a surface on the object side, a surface on the eyeball side, and a side surface,
It has a lens body and a light guide member,
The entire surface on the eyeball side is constituted by the lens body, and at least a part of the surface on the eyeball side is a curved surface portion,
When the image light is incident from the eyeball side surface or the side surface of the eyeglass lens, travels through the light guide member, and exits from the curved surface portion of the eyeball side surface, the power of the eyeglass lens with respect to the wearer's eye An eyeglass lens having a difference of not more than 0.50 D from the power of the eyeglass lens with respect to the eye of the wearer when entering from the side surface and exiting from the curved surface portion of the surface on the eyeball side.   The spectacle lens according to claim 1, wherein the power of the spectacle lens with respect to the wearer's eye is not zero when external light is incident from the object-side surface and exits from the curved surface portion of the eye-side surface.   The spectacle lens according to claim 1 or 2, wherein the difference between the curvature of the surface on the object side and the curvature of the portion of the surface or side on the eyeball side on which the image light is incident is 0.15 D or less in refractive power.   The spectacle lens according to any one of claims 1 to 3, wherein the spectacle lens has a meniscus shape. A head mounted display comprising: an eyeglass lens having a surface on the object side, a surface on the eyeball side, and a side surface, and an image light emitting unit that emits image light,
The spectacle lens has a lens body and a light guide member,
The entire surface on the eyeball side is constituted by the lens body, and at least a part of the surface on the eyeball side is a curved surface portion,
An eyeglass lens for the eye of the wearer when the image light emitted from the image light emitting portion is incident from the surface on the eyeball side or the side surface of the eyeglass lens, travels through the light guide member, and exits from the curved portion of the surface on the eyeball side A head mount having a difference of not more than 0.50 D between the dioptric power of the lens and the dioptric power of the spectacle lens with respect to the eye of the wearer when external light is incident from the surface on the object side and exits from the curved portion of the surface on the eye display.   The head mounted display according to claim 5, wherein the power of the spectacle lens with respect to the wearer's eye is not zero when external light is incident from the object side surface and emitted from the curved surface portion of the eye side surface. A lens blank for an eyeglass lens having an object side planned surface before the object side surface is processed, an eyeball side planned surface before the eyeball side surface is processed, and a side surface planned surface sandwiched between both surfaces And
A lens blank body and a light guide member capable of reaching image light;
The entire eyeball side planned surface is constituted by the lens blank body,
A lens blank, wherein the object side planned surface and the eyeball side planned surface have a convex shape.   The lens blank according to claim 7, wherein a difference between the curvature of at least one of the curvature on the object side planned surface and the curvature on the side planned surface and the curvature of the eyeball side planned surface is 0.15 D or less in refractive power. It is a semi-finished lens blank for an eyeglass lens having a surface on the object side, a planned surface on the side of the eyeball before the processing on the surface on the eyeball side, and a side scheduled surface sandwiched between both surfaces,
A semi-finished lens blank body and a light guide member capable of reaching image light;
The entire planned eyeball side is composed of a semi-finished lens blank body,
A semi-finished lens blank in which the object side surface and the eyeball side planned surface have a convex shape.   10. The semi-finished lens blank according to claim 9, wherein a difference between the curvature of at least one of the surface on the object side and the curvature of the predetermined side surface and the curvature of the predetermined eye surface is 0.15 D or less in refractive power.