JPH11337886A - Ophthalmic lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ophthalmic lens where the contact boundary between a transparent lens and a lens for hypermetropia is smoothly curved to eliminate a difference in thickness like a step. SOLUTION: This ophthalmic lens 1 is provided with a transparent lens 11 and a lens 12 for hypermetropia, and the lens 12 is connected to the lower end of the transparent lens 11, and the lens 12 is smoothly curved from the lower end of the transparent lens 11 and is extended downward, and a contact boundary 13 between the transparent lens 11 and the lens 12 is inclined and connected not to form a difference in thickness like a step, and therefore, a trouble of sight doesn't occur.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectacle lens having two different lenses.

[0002]

2. Description of the Related Art FIGS. 5, 6 and 7 show a first type of spectacle lens having two different types of lenses which has conventionally been used. And a lens 102. Next, as shown in FIG. 8, when making this spectacle lens, two molds 201, 2 having two different curved surfaces 203, 204 on the upper surface thereof.
02 and an upper layer mold 30 having a single curved surface 301 on the lower surface thereof, and then combining the upper layer mold 30 and the lower layer mold 20 to form the spectacle lens 10. Mold.

FIGS. 9, 10 and 11 show a second type of conventional spectacle lens 40. FIG. This eyeglass lens 4
Numeral 0 has a large flat light lens 401, and a relatively small far vision lens 402 is formed in the lower half of the flat light lens 401. Further, as shown in FIG. 12, when producing the spectacle lens 40, a single curved surface 50 is formed on the upper surface thereof.
1 is prepared, and an upper layer mold 60 having a single curved surface 601 on the lower surface is further prepared.
A small 603 having a single curved surface 601 on the lower surface different from the single curved surface 601 on the lower surface of the upper mold 60 is fitted in the hole 602 at an appropriate place. To form a hyperopic lens 402.

[0004]

However, the above-mentioned conventional spectacle lens has the following disadvantages. First, the first type of spectacle lens 10 has the following disadvantages when actually used. (1) The flat light lens 101 is a lens generally having no power. The thickness can be reduced as much as possible to reduce the weight, and the intermediate portion 103 near the center of the spectacle lens 10 and the outer edge 104 The thickness is the same. But,
The intermediate portion 105 of the hyperopic lens 102 is relatively thick, and its outer edge 106 is thin. Therefore, since the top end of the thickest intermediate portion 105 of the hyperopic lens 102 is close to the center of the spectacle lens 10, the thickness of the planoscopic lens 101 must also match the top end of the thickest intermediate portion 105 of the hyperopic lens. A stepped thickness difference is formed at the contact boundary, which causes visual impairment. If the thickness of the flat light lens 101 is increased, the spectacle lens 10 itself becomes heavy, and the burden on the user increases.

(2) After the thickness of the flat light lens 101 is increased, a stepwise thickness difference is formed between the outer edges 104 on both sides of the flat light lens 101 and the relatively thin outer edges 106 of the hyperopic lens 102, causing visual impairment. I do. (3) Since the lower mold 20 is a combination of the two molds 201 and 202, when the spectacle lens is molded, the thickness difference is more remarkably formed at the contact boundary between the flat light lens 101 and the far vision lens 102. And cause visual impairment.

Next, when the above-mentioned second type of conventional spectacle lens 40 is actually used, there are the following disadvantages. (1) The hyperopic lens 402 protrudes from the front surface of the plano-lens lens 401, and the range of the hyperopic lens 402 must be limited. Forming a step-like thickness difference, combined with the thickness of the plano lens 401,
The eye behind the spectacle lens 40 clearly sees the edge of the upper end 403 of the hyperopic lens 402, which hinders vision.

(3) Further, since the upper layer mold 60 has the small size 603, the step thickness difference at the contact boundary between the upper end 403 of the far vision lens 402 and the flat light lens 401 becomes more remarkable. May cause visual impairment. Accordingly, it is an object of the present invention to provide a spectacle lens having no stepwise thickness difference at a contact boundary between a plano lens and a hyperopic lens.

[0008]

According to the means of the present invention,
A hyperopia lens is connected to the lower end of the transparent lens, and this hyperopia lens smoothly extends downward from the lower end of the transparent lens, and the contact boundary between the hyperopia lens and the transparent lens becomes curved, and has a step-like shape. The thickness difference is prevented from being formed, so that visual impairment does not occur.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. First, as shown in FIG. 1, FIG. 2 and FIG. 3, the spectacle lens 1 of this embodiment has a far-sighted lens 12 connected to the lower end of a transparent lens 11 such as a plano-lens lens or a far-sighted lens. 11 smoothly extends downward from the lower end. Therefore, the contact boundary 13 between the upper end of the hyperopic lens 12 and the lower end of the transparent lens 11
Constitutes the most natural inclined connection and this contact boundary 13
Does not form any stepwise thickness difference and naturally forms an appropriate curve. The transparent lens 11 may be a planoscopic lens having no power or a hyperopic lens having a power different from that of the hyperopic lens 12, so that the spectacle lens may correct the visual acuity so that a distant object or a near object can be seen at the same time.

Further, as shown in FIG. 4, when producing the spectacle lens 1 of the present embodiment, two curved surfaces 21, 22 are formed on the upper surface.
And an upper layer mold 3 having a single curved surface 31 on the lower surface. The contact boundary between the curved surfaces 21 and 22 forms a smoothly sloped curve, and the contact boundary 23 has an appropriate curve. With. When designing the mold of the above-mentioned spectacle lens, first, the focal points of the transparent lens 11 to be molded on the lower mold, the hyperopic lens 12, and the curved surfaces 21 and 22 of the hyperopic lens 12 are determined. Therefore, the contact boundary 23 between the two curved surfaces 21 and 22
Form a naturally curved connection. Therefore, the contact boundary 13 between the molded transparent lens 11 and the hyperopic lens 12 naturally forms a curved connection.

As described above, this embodiment has the following effects and advantages. (1) The connecting portion between the transparent lens 11 and the hyperopic lens is smoothly curved, and the transparent lens 11 is not restrained by the thickness of the hyperopic lens 12 and does not increase. (2) The connecting portion between the transparent lens 11 and the hyperopic lens 12 is smoothly curved, the hyperopic lens 12 does not protrude from the front surface of the transparent lens 11, and the transparent lens 11 increases without being restrained by the thickness of the hyperopic lens 12. As a result, no stepwise thickness difference is formed, and no visual impairment is caused thereby.

(3) Transparent lens 11 and hyperopic lens 12
The lower mold 2 is a single mold having a smooth curved surface and does not include a small mold in the conventional two molds or molds.
The contact boundary 13 between 1 and the hyperopic lens 12 is smooth,
There is no noticeable step difference in the thickness of the contact boundary for joining the molds, so that no visual impairment occurs.

(4) Since the upper mold 3 and the lower mold 2 used for the manufacture are all of a single type, the manufacture and combination thereof are simpler than the conventional one. (5) The transparent lens 11 may be a flat lens having no power,
Alternatively, a hyperopic lens having a power different from that of the hyperopic lens may be used. Therefore, if the transparent lens is a hyperopic lens having a power different from that of the hyperopic lens, the visual acuity can be corrected so that a distant object and a near object can be clearly seen separately.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an eyeglass lens according to an embodiment of the present invention.

FIG. 2 is a front view showing a spectacle lens according to an embodiment of the present invention.

FIG. 3 is a top view illustrating a spectacle lens according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a spectacle lens and its mold according to an embodiment of the present invention.

FIG. 5 is a perspective view showing a first type of spectacle lens of the related art.

FIG. 6 is a front view showing a conventional first-type spectacle lens.

FIG. 7 is a top view showing a first type of spectacle lens of the related art.

FIG. 8 is a cross-sectional view showing a conventional first-type spectacle lens and its type.

FIG. 9 is a perspective view showing a second type of conventional spectacle lens.

FIG. 10 is a front view showing a second type of conventional spectacle lens.

FIG. 11 is a top view showing a second type of conventional spectacle lens.

FIG. 12 is a cross-sectional view showing a second type of conventional spectacle lens and its mold.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Glasses lens 11 Transparent lens 12 Hyperopia lens 13, 23 Contact boundary

Claims (3)

[Claims] 1. A transparent lens, and a hyperopia lens connected to a lower end of the transparent lens, wherein the hyperopia lens smoothly extends downward from a lower end of the transparent lens in a curved shape, and the hyperopia lens and the transparent lens. A contact lens with an eyeglass lens having a sloped and curved shape, having no stepwise thickness difference, and causing no visual impairment. 2. The spectacle lens according to claim 1, wherein the transparent lens includes a flat light lens having no power. 3. The spectacle lens according to claim 1, wherein the transparent lens includes a hyperopic lens having a power different from that of the hyperopic lens.