JP4650583B2 - Combination spectacle lens, auxiliary lens, and method for processing target lens shape of combination spectacle lens - Google Patents

Description

  The present invention relates to a combination spectacle lens having a progressive refractive power for correcting vision mainly for a presbyopia with weak adjustment power, an auxiliary lens used for the combination spectacle lens, and a target lens processing method suitable for the combination spectacle lens.

  Progressive-power lenses are mainly used as vision correction lenses for presbyopia who have weakened their ability to adjust. From the power required when looking at a lens at a distance or at an intermediate distance on a single lens. It is a lens that changes continuously to the power required when looking close, and has no boundaries and is excellent in fashion.

  The optical characteristics of the progressive-power lens are substantially determined by the progressive zone length, which is the distance between the progressive portions whose power changes continuously on the main meridian, and the addition power, which is the difference between the frequencies of the progressive portions. In the design for each application, for example, both the far vision and the near vision are arranged in a well-balanced manner, and the progressive zone length is set to about 10 to 16 mm so that the eyes can be easily rotated during near vision. There is a perspective type. In addition, there are so-called near and near types that emphasize the field of view from the middle region of about 1 m to the hand, especially the so-called near type that emphasizes the field of view at hand. In order to realize a wide field of view, the progressive zone length is designed as long as about 19 to 25 mm. In this way, optimal optical characteristics for different applications cannot be obtained with one design at the same time.

  When going out, a comfortable visual field can be obtained by using a perspective type that emphasizes distance vision. When working at desk work or indoors, a comfortable visual field can be obtained by using the near and near types. In order to obtain a comfortable field of view both when going out and working indoors, it is necessary to prepare a perspective lens and a middle lens in a spectacle frame.

  However, in this case, it is necessary to purchase a lens with a different design and to purchase a spectacle frame for each lens, which requires a large expense. Therefore, it is very convenient if the design type of the progressive power lens can be easily changed by combining spectacle lenses.

  It is known to combine two spectacle lenses, and as shown in Patent Documents 1 and 2 below, an apron that allows a sub lens to be detachably attached to the front surface of a normal spectacle lens as a basic lens by a clip mechanism or the like. Expression glasses are known.

  In Patent Document 3 below, it is proposed that two progressive power lenses are used and the change in refractive power on one side is canceled or alleviated on the other side to improve aberrations and improve the field of view. However, it is merely a single-focus appearance, and is not designed to be optimally designed for different applications.

JP 2003-315751 A Utility Model Registration No. 3030336 Japanese Patent No. 2519921

  The present invention has been made in view of the above circumstances, and it is a first object of the present invention to provide a combination spectacle lens that can easily change the design type of a progressive-power lens.

  The sub-lenses used in the above-mentioned spectacle glasses are dimming and polarized sunglasses and single vision lenses for presbyopia, and are intended to be added to the existing spectacle lenses. The overlapping position accuracy is not so necessary, and the overlapping position of both lenses may be appropriate. On the other hand, the combination spectacle lens in which the design type of the progressive power lens can be easily changed is fundamentally different from the front spectacle, and both the basic lens and the auxiliary lens have a progressive refractive surface. Therefore, when actually used, a predetermined optical performance cannot be obtained unless they are superposed on each other at an accurate position.

  The present invention has been made in view of the above circumstances, and includes a basic lens and an auxiliary lens of a combination spectacle lens including a basic lens having progressive refractive power and an auxiliary lens having refractive power capable of converting the design type of the basic lens. It is a second object to provide a combination spectacle lens that can be combined at an accurate position.

  In addition, a third object of the present invention is to provide an auxiliary lens that can easily change the design type of the basic lens in combination with the basic lens.

  When assembling and using the basic lens and auxiliary lens, there is a possibility that an assembly error may occur due to the processing of the lens that is processed into the outer shape that can be accommodated in the spectacle frame, and the accuracy of the processing of the lens may not ensure the assembly accuracy. .

  The present invention has been made in view of the above circumstances, and is a combination that can ensure the assembly accuracy of a combination spectacle lens composed of a basic lens having progressive refractive power and an auxiliary lens having refractive power capable of converting the design type of the basic lens. A fourth object is to provide a lens shape processing method for a spectacle lens.

In order to achieve the first object, the present invention firstly provides a first refraction having a refractive power for viewing an object located at a predetermined distance on either the object side or the eyeball side. A progressive refracting surface comprising: a second refractive part having a refractive power different from that of the first refractive part; and a progressive part whose refractive power gradually changes from the first refractive part to the second refractive part. A combination spectacle lens in which an auxiliary lens is combined with a basic lens, and a combined refractive power obtained by combining the basic lens refractive power of the basic lens and the auxiliary lens refractive power of the auxiliary lens is the basic lens refractive power. partially or a combined spectacle lens is different over the entire surface and the auxiliary lens from the progressive starting point of the progressive starting point or the combination spectacle lens of the basic lens, the basic lens Until the terminating point of progressivity of the terminating point of progressivity or the combination spectacle lens has a maximum or minimum value refractive power of the auxiliary lens, the progressive starting point in the combined spectacle lens is the in the basic lens It has been changed from the progressive starting point, or, the terminating point of progressivity of the combined spectacle lens to provide a combined spectacle lens characterized by being changed from the terminating point of progressivity of the basic lens.

  The basic lens design type can be easily changed by combining an auxiliary lens with a refractive power that changes the refractive power, such as the addition power and progressive zone length of the basic lens, partially or entirely. Can do.

  The combined refractive power of the combination spectacle lens combining the auxiliary lens with the basic lens is different from the basic lens refractive power at one or more of the progressive start point and the progressive end point. It is possible to change the design type of the progressive-power lens that is almost determined.

The present invention, in the second, in the first combined spectacle lens, a combination lens addition power in the combined spectacle lens, the combined spectacle lens characterized by being different from the basic lens addition power of the basic lens has provide.

  Progression that is almost determined by the addition power and the progressive zone length because the addition power (combination lens addition power) of the combination spectacle lens combining the auxiliary lens with the basic lens is different from the addition power of the basic lens (basic lens addition power). It is possible to change the design type of the refractive power lens.

The present invention, in the third, in the first combined spectacle lens, the basic lens, the refractive surface on the eyeball side having the progressive refractive surface, a refractive surface of the auxiliary lens side is formed into a spherical or toric surface The combination spectacle lens is characterized in that the refractive surface of the auxiliary lens on the basic lens side is formed on the same spherical surface or toric surface as the refractive surface of the basic lens on the auxiliary lens side.

  By forming both the object side refracting surface of the basic lens and the refracting surface of the basic lens side (eyeball side) of the auxiliary lens on the same spherical surface or toric surface, both lenses are combined when these basic lens and auxiliary lens are combined. Can be closely attached, and the optical characteristics can be synthesized with high accuracy.

In order to achieve the second object, fourth , the present invention is any one of the first to third combination eyeglass lenses, and is designed in at least two places on any refractive surface of the basic lens. A first alignment mark indicating a reference position and a predetermined direction is provided, and a second alignment mark indicating the design reference position and a predetermined direction is provided at at least two places on any refractive surface of the auxiliary lens. A combination spectacle lens characterized by the above is provided.

  By providing an alignment mark indicating a design reference position and a predetermined direction on both the basic lens and the auxiliary lens, the basic lens and the auxiliary lens can be combined at an accurate position using these alignment marks as a reference.

The present invention, in the fifth, in the fourth combined spectacle lens, wherein the first alignment mark, to provide a combined spectacle lens, characterized in that are provided at positions indicating the fitting point and the horizontal direction.

  It is necessary to attach an alignment reference mark indicating the fitting point and the horizontal direction to the progressive-power lens. Therefore, it is efficient to use this alignment reference mark as the first alignment mark provided on the basic lens.

The present invention, in the sixth, in the fourth combined spectacle lens, the second alignment mark, to provide a combined spectacle lens which is characterized in that provided in each of the position overlapping with the first alignment mark .

  By providing the first alignment mark and the second alignment mark at a position where they overlap each other, when the basic lens and the auxiliary lens are combined, it is possible to accurately align them by visually confirming that these alignment marks are overlapping. Can be easily confirmed.

The perspective view which shows the combination spectacles lens of this invention. Sectional drawing of the combination spectacle lens of this invention. The conceptual diagram which shows the division | segmentation of the zone | band of a basic lens. The conceptual diagram explaining the design type of a progressive-power lens. (A)-(c) is a graph which shows the refractive power change on each main meridian of the basic lens of Example 1, an auxiliary lens, and a combination spectacle lens. 7 is a graph showing changes in refractive power on the principal meridian of each of the basic lens, auxiliary lens, and combination spectacle lens of Example 2. 6 is a graph showing changes in refractive power on the principal meridian of each of the basic lens, auxiliary lens, and combination spectacle lens of Example 3. The front view which shows the example of the alignment mark provided in a basic lens and an auxiliary lens. The front view which shows the combination of the alignment mark of a combination spectacle lens. Sectional drawing of the lens which shows the adhesion process of the target lens processing method of this invention. The front view of the lens explaining the process of the target lens shape processing method of this invention.

  Hereinafter, embodiments of the eyeglass processing method of the combination spectacle lens and the auxiliary lens and the combination spectacle lens of the present invention will be described, but the present invention is not limited to the following embodiment.

  As shown in the perspective view of FIG. 1, the combination spectacle lens 1 of the present invention is used only for the combination with the basic lens 2 which is a progressive power lens and the basic lens 2, and converts the design type of the basic lens 2. And an auxiliary lens 3 having a refractive power. The basic lens 2 and the auxiliary lens 3 match the main meridian 21 of the basic lens 2 with the main gaze line 31 of the auxiliary lens 3 that coincides with the main meridian 21, and the optical axes OA of the basic lens 2 and the auxiliary lens 3 Are used in combination so as to match.

  As shown in the sectional view of the combination spectacle lens 1 in FIG. 2, as a combination form, the basic lens 2 can be disposed on the eyeball side, and the auxiliary lens 3 can be disposed on the object side. Further, the basic lens 2 may be disposed on the object side and the auxiliary lens 3 may be disposed on the eyeball side. The progressive refracting surface of the basic lens 2 may be provided on either the eyeball side refracting surface 22 or the object side refracting surface 23, and may be provided on both surfaces. Even in the auxiliary lens 3, a refractive power that changes the refractive power (basic lens refractive power) of the basic lens 2 partially or over the entire surface may be given to both the refractive surface 32 on the eyeball side and the refractive surface 33 on the object side. Good.

  In order to bring the basic lens 2 and the auxiliary lens 3 into close contact with each other, it is preferable to provide a progressive refractive surface on the eyeball side refractive surface 22 of the basic lens 2 and the object side refractive surface 23 to be a spherical surface or a toric surface. On the other hand, the auxiliary lens 3 has a refractive surface 32 on the eyeball side formed on a spherical surface or a toric surface that is substantially the same curved surface as the refractive surface 23 on the object side of the basic lens 2, and the refractive power of the basic lens 2 on the refractive surface 33 on the object side. It is preferable to give a refractive power to change the power. When such a basic lens 2 is placed on the eyeball side and the auxiliary lens 3 is placed on the object side and combined, the object-side refractive surface 23 of the basic lens 2 and the eyeball-side refractive surface 32 of the auxiliary lens 3 are in close contact with each other. The attached state of the auxiliary lens 3 is stabilized, the lenses 2 and 3 are hardly displaced, the positional accuracy is improved, and predetermined optical characteristics can be synthesized with high accuracy.

  The basic lens 2 used for the combination spectacle lens 1 is a normal progressive-power lens. As shown in the conceptual diagram of the plane of FIG. 3, the progressive addition lens 2 includes a first refracting portion 201 having a refractive power necessary for viewing a lens at a predetermined distance, for example, a far distance or an intermediate distance, The second refracting unit 202 having a refractive power different from that of the refracting unit 201, for example, a refractive power necessary for looking close, and the refractive power continuously changes between the first refracting unit 201 and the second refracting unit 202. It is a lens having a progressive refraction surface that is divided into a progressive portion 203 that is formed.

  FIG. 4 shows an example of the refractive power distribution of the design type for each application in the progressive-power lens. The refractive power shown in FIG. 4 is the refractive power on the main meridian. In a so-called perspective type progressive-power lens, a distance portion for viewing a far object above the lens, a near portion under the lens for viewing a near object, and a progressive end from the upper progressive start point to the lower one And a progressive portion in which the refractive power gradually changes between the points. Both the distance and near parts are arranged in a well-balanced manner, and the progressive zone length, which is the distance from the progressive start point to the progressive end point, is set to about 10 to 16 mm so that the eyes can be easily rotated during near vision. Designed. The difference in refractive power between the progressive start point and the progressive end point is called the addition power. The fitting point generally coincides with the distance center, that is, the progressive start point.

  The so-called medium-to-long progressive-power lens has a distance portion for viewing a distant portion at the upper end of the lens and a near portion for a relatively wide area for viewing a near portion below the lens. And a progressive portion where the refractive power gradually changes. The progressive zone length is designed to be as long as about 19 to 25 mm in order to realize a wide field of view in intermediate vision. The fitting point is generally in the progressive part where you see what is at a distance of around 1 m.

  In a so-called near-type progressive-power lens, an intermediate part for viewing an object at an intermediate distance above the lens, and a near part for a relatively wide area for viewing an object near the lower part of the lens. And a progressive portion where the refractive power gradually changes. The progressive zone length is designed to be as long as about 19 to 25 mm in order to realize a wide field of view in intermediate vision.

  Furthermore, in the design of the distribution of distortion and astigmatism, the distance-use and near-use parts are widened, the aberration-concentrated type in which aberrations are concentrated in a narrow progressive part, and the distance-use and near-use parts are narrowed, It can be roughly classified into an aberration dispersion type in which the progressive portion is widened and the aberration in the intermediate portion is diffused. The progressive power lens used as the basic lens 2 may be of any design type.

  The auxiliary lens 3 is used in combination with such a basic lens 2, and for example, converts the combined refractive power combined with the perspective type basic lens 2 so that it becomes a middle or near type. be able to. In addition, it can be converted into a perspective type in combination with a middle or near type basic lens. In addition, it can be converted into a near-near type in combination with a middle-near type basic lens, or vice versa. The auxiliary lens 3 can be combined with the aberration-concentrated basic lens 2 to be converted into an aberration-dispersive type, or combined with the aberration-dispersed basic lens 2 to be converted into an aberration-concentrated type. Furthermore, the power of the distance portion or the near portion can be changed without changing the design type of the basic lens 2, that is, only the addition power can be changed.

  The refractive power of the auxiliary lens 3 (auxiliary lens refractive power) needs to be the refractive power of the combined spectacle lens 1 to be obtained by converting the combined refractive power combined with the basic lens refractive power of the basic lens 2. There is. That is, the difference between the refractive power at a predetermined position of the basic lens 2 and the refractive power at a position corresponding to the predetermined position of the basic lens 2 of the combination spectacle lens 1 to be obtained by conversion. Hereinafter, Examples 1 to 3 will be shown, and the refractive power of the auxiliary lens 3 will be specifically described.

  FIG. 5 shows a main meridian of each of the basic lens, the auxiliary lens, and the combined spectacle lens in the case of combining the perspective type basic lens and the auxiliary lens to form a middle / near type combined spectacle lens as Example 1 (in the case of the auxiliary lens). Although it is the main gazing line, it coincides with the main meridian, and hence is a graph showing a change in refractive power on the main meridian for convenience. The position where the number on the main meridian on the horizontal axis is zero is the position of the fitting point. The unit of the refractive power on the vertical axis is diopter (D), and indicates the change in refractive power.

  FIG. 5A shows a graph of the change in refractive power on the main meridian of the basic lens. The change in refractive power on the main meridian of the basic lens starts to add power to the distance power from the fitting point, and reaches a desired near power at 12 mm below the fitting point. The basic lens is a progressive power lens of a near-far type having a progressive zone length of 12 mm and an addition power (basic lens addition power) of 2.0 diopters.

  FIG. 5 (c) shows a graph of the change in refractive power on the main meridian of a middle / near combination eyeglass lens to be obtained by combining the refractive power of the basic lens with the refractive power of the basic lens. The change in the refractive power on the main meridian of the combination spectacle lens starts to add power from 8 mm above the fitting point to the distance power and reaches the desired near power at 12 mm below the fitting point. The progressive start point is at a position 8 mm upward from the fitting point, the progressive end point is at a position 12 mm downward from the fitting point, and the progressive zone length is 20 mm. The refractive power is such that a fitting point can be seen at an intermediate distance. There is no change in basic lens, addition power and progressive end point. In the conversion using the auxiliary lens, it is necessary to move the progressive start point upward by 8 mm.

  FIG. 5B shows a graph of the change in refractive power on the main meridian of the auxiliary lens. The refractive power added by the auxiliary lens is a refractive power difference at a corresponding position between the refractive power indicated by C in FIG. 5C and the refractive power indicated by A in FIG. This is the refractive power indicated by B in (b). The change in refractive power on the main meridian of the auxiliary lens is a region where the refractive power is zero from the upper end to 8 mm above the fitting point, which is the progressive start point of the combined spectacle lens, and the refractive power increases from 8 mm above the fitting point. The refractive power becomes maximum 2 mm below the fitting point, the refractive power becomes zero again at the progressive end point 12 mm below the fitting point, and the refractive power is zero below the progressive end point.

  A combined spectacle lens in which a basic lens of a perspective power lens having a refractive power change A shown in FIG. 5A and an auxiliary lens having a refractive power change B shown in FIG. It becomes a middle-to-near-type progressive-power lens having a combined refractive power change C shown in (c).

  Such a combination of the basic lens and the auxiliary lens can provide a comfortable visual field by using only the perspective type basic lens when going out mainly using far vision. When an auxiliary lens is attached to the basic lens when working indoors, the obtained combined spectacle lens becomes a near-in-range type, and a comfortable visual field can be obtained by desk work.

  FIG. 6 shows the refractive power on the principal meridian of each of the basic lens, the auxiliary lens, and the combined spectacle lens in the case where the middle and near type basic lens is combined with the auxiliary lens to form the combined spectacle lens as Example 2. A graph of change is shown. The position where the number on the main meridian is zero is the position of the fitting point. The unit of refractive power on the vertical axis is diopter, and indicates a change in refractive power.

  The change in refractive power on the main meridian of the basic lens is shown by a dashed line A, the change in refractive power on the main meridian of the auxiliary lens is shown by a broken line B, and the change in refractive power on the main meridian of the combination spectacle lens is shown. This is indicated by a solid line C. The refractive power of the auxiliary lens indicated by the broken line B is a value obtained by subtracting the refractive power of the combination spectacle lens indicated by the solid line C from the refractive power of the basic lens indicated by the alternate long and short dash line A at the same principal meridian position.

  The basic lens has a progressive start point that is 10 mm above the fitting point, a progressive end point that is 14 mm below the fitting point, a progressive zone length of 24 mm, and a basic lens addition power of 2.0 diopters in the middle type. is there.

  The auxiliary lens has an area where the refractive power is zero at the top, minus refractive power is added from the progressive start point of the basic lens, there is a minimum of refractive power 2 mm below the fitting point, and the progressive end point of the combination spectacle lens There is a maximum refractive power in the vicinity of the position corresponding to, and a constant refractive power of -0.5 diopters is below the progressive end point of the basic lens.

  The combined refractive power of the combination spectacle lens in which these basic lens refractive power and auxiliary lens refractive power are combined, the progressive start point is the fitting point, the progressive end point is 12 mm below the fitting point, and the progressive zone length is The addition power (additional power of the combined lens) is 1.5 diopters. In this example, the progressive start point, progressive end point, and addition power of the basic lens are changed by the auxiliary lens.

  In Example 2, the combination spectacle lens in which the basic lens of the medium- and near-type progressive power lens having the refractive power change A and the auxiliary lens having the refractive power change B shown in FIG. This is a progressive power lens of the perspective type having.

  Such a combination of the basic lens and the auxiliary lens can provide a comfortable visual field in desk work only with the middle and close type basic lenses when working indoors. When going out, it is possible to obtain a comfortable field of view by adding an auxiliary lens to form a perspective type combination spectacle lens, in addition to a decrease in the addition power.

  FIG. 7 shows the refractive power on the main meridian of each of the basic lens, the auxiliary lens, and the combined spectacle lens in the case of combining the near-near type basic lens and the auxiliary lens to form the combined spectacle lens of Example 3 as Example 3. A graph of change is shown. The position where the number on the main meridian is zero is the position of the fitting point. The unit of refractive power on the vertical axis is diopter, and indicates a change in refractive power.

  In FIG. 7, the change in refractive power on the main meridian of the basic lens is indicated by an alternate long and short dash line A, the change in refractive power on the main meridian of the auxiliary lens is indicated by a broken line B, and the refraction on the main meridian of the combination spectacle lens. The change in force is indicated by a solid line C. The refractive power of the auxiliary lens indicated by the broken line B is a value obtained by subtracting the refractive power of the combination spectacle lens indicated by the solid line C from the refractive power of the basic lens indicated by the alternate long and short dash line A at the same principal meridian position.

  The change in refractive power on the main meridian of the basic lens starts to add power from 8 mm above the fitting point to the distance power and reaches the desired near power at 12 mm below the fitting point. The change in the refractive power on the main meridian of the auxiliary lens is a region where the refractive power is zero from the upper end to 8 mm above the fitting point, the refractive power decreases from 8 mm above the fitting point, and is the largest at 2 mm below the fitting point. It becomes a large negative value, then increases, becomes zero again 12 mm below the fitting point, and thereafter is a region where the refractive power is zero. The change in refractive power on the main meridian of a combination spectacle lens combining such a basic lens and an auxiliary lens starts to add power from the fitting point and reaches a predetermined near power at 12 mm below the fitting point.

  The basic lens has a progressive zone length of 20 mm and an addition power of 2.0 diopters, and the intermediate type progressive addition lens is combined with the refractive power of the auxiliary lens. The combined spectacle lens has a progressive zone length of 12 mm and an addition power of 2.0. It has been converted to a diopter perspective type progressive power lens.

  When you work indoors, you can get a comfortable field of view in your desk work with only the basic and near-type lenses. When going out, a comfortable visual field can be obtained by attaching an auxiliary lens to form a combined type of spectacle lens.

  Thus, it is preferable that the auxiliary lens partially changes the refractive power of the basic lens instead of the entire lens, and when changing the design type, at least either above or below the main gaze line that matches the main meridian of the basic lens. On the other hand, it has a region where the refractive power is zero. Further, when changing the progressive start point or the progressive end point of the basic lens, there is a portion where the refractive power is maximized or minimized in the middle portion of the main gazing line. However, when only the addition power of the basic lens is changed, there is no maximum / minimum portion, and there is a portion having a certain refractive power on either the upper or lower side of the main gazing line.

  Since the auxiliary lens only needs to have a function that complements the refractive power of the basic lens, it is not necessary to have a large change in refractive power. The shape of the refracting surface that realizes the refractive power of the auxiliary lens shown in the above-described embodiments is ± 0.2 mm with respect to the approximate spherical shape, and has a substantially constant thickness. Therefore, the auxiliary lens can be made thin. Since the thickness can be reduced, the auxiliary lens can be a bonded type. Since the auxiliary lens can be made thin, even if it is combined with the basic lens, the weight does not increase so much, the comfort of wearing is not impaired, and the appearance is good.

  Since the auxiliary lens in the combination spectacle lens of the present invention can be thinned, it is possible to transmit light together with refractive power for outdoor use by dyeing and adding the function of sunglasses, or using a dimming material or a polarizing material. It becomes possible to change according to the performance, and it becomes more convenient.

  Since the combination spectacle lens of the present invention can be easily converted by combining the design type of the basic lens with the auxiliary lens, if several types of auxiliary lenses are prepared, the auxiliary lens can be changed according to the environment in which the spectacle lens is used, By using only the basic lens without using the auxiliary lens, a comfortable visual field adapted to the environment can be obtained at low cost without purchasing a spectacle frame.

  Furthermore, when the eye level of a person wearing spectacles has advanced and it is necessary to change the power of the distance part or the near part, it is necessary to change the distance lens power or the near power part without changing the design type of the basic lens. You only need to purchase an auxiliary lens that can change only the power and attach it to the basic lens. Since it is only necessary to purchase a new auxiliary lens without replacing the spectacle lens, it is possible to keep a comfortable visual field at a low cost according to the progress of the eye power.

  As a method of using the combination spectacle lens 1 of the present invention, the basic lens 2 is used as a normal progressive-power spectacle lens by being fitted to the spectacle frame, and the auxiliary lens 3 is detachably attached to the basic lens 2. It is preferable. In use, the combination spectacle lens 1 of the present invention is not used by superimposing both the basic lens 2 and the auxiliary lens 3 at an accurate position because both the basic lens 2 and the auxiliary lens 3 have progressive refractive surfaces. As a result, the desired optical performance cannot be obtained. If the mutual positions are shifted, the optical performance of the basic lens 2 is impaired by the auxiliary lens 3, and a comfortable visual field cannot be obtained.

  Therefore, in the combination spectacle lens 1 of the present invention, the first alignment marks for positioning are provided in at least two places on any one of the refractive surfaces of the basic lens 2 and at least two places on any one of the refractive surfaces of the auxiliary lens 3. It is preferable to provide a second alignment mark for positioning. The first alignment mark of the basic lens 2 indicates a design reference position and a predetermined direction, and the second alignment mark is formed so as to indicate the design reference position and a predetermined direction. In the combination spectacle lens 1 of the present invention, the basic lens 2 and the auxiliary lens 3 are combined based on the positions of the first alignment mark and the second alignment mark, and mutual positional accuracy is ensured when combined. it can.

  FIG. 8A is a plan view showing an example in which the first alignment mark 25 is provided on the basic lens 2 having a perspective type progressive refractive power. FIG. 8B is a plan view showing an example in which the second alignment mark 35 is provided on the auxiliary lens 3 having a refractive power capable of converting the progressive refractive power of the basic lens 2 to a middle-near type. FIG. 9 shows an overlapping state of the first alignment mark 25 and the second alignment mark 35 in the combination spectacle lens 1 in which the combined refractive power obtained by superposing the basic lens 2 and the auxiliary lens 3 has a progressive refractive power of a near-near type. FIG. 8 and 9, the aberration distribution of each lens is schematically shown by a broken line.

  As shown in FIG. 8A, the progressive addition lens of the basic lens 2 has at least a vertical direction. In addition, when the second refracting part is displaced to the nose side in consideration of convergence, the nose side and the ear side There are left and right directions. Similarly, the auxiliary lens 3 combined with the basic lens 2 has a vertical direction and a horizontal direction as shown in FIG. The lenses shown in FIGS. 8 and 9 are lenses for the left eye, and the second refracting portion is displaced to the nose side. In order to position and combine the basic lens 2 and the auxiliary lens 3 at an accurate position, the alignment marks 25 and 35 need to indicate a reference position serving as a reference and accurately indicate a predetermined direction.

  In the present invention, at least two first alignment marks 25 are provided on one or both of the object-side refractive surface 23 and the eyeball-side refractive surface 22 of the basic lens 2. By providing the first alignment marks 25 in at least two places, the design reference position can be determined from these positions, and the position of the fitting point and a predetermined direction, for example, the horizontal direction and / or the vertical direction can be indicated. The basic lens 2 is a normal progressive-power lens, and the progressive-power lens is obliged to provide an alignment reference mark according to ISO and JIS regulations. The alignment reference marks are determined at two locations on the lens at a horizontal distance of 34 mm. Since the alignment reference mark is provided in a portion that enters the field of view, it is formed as a hidden mark so as not to stand out. As the first alignment mark 25 provided on the basic lens, it is reasonable to always use the alignment reference mark provided as it is. However, it may be provided separately from the alignment reference mark.

  The two first alignment marks 25 shown in FIG. 8A use alignment reference marks as they are, and two S characters are provided at a location 34 mm apart in the horizontal direction with the design reference position as the center. Yes. In many cases, the fitting point is the same as the design reference position, or is provided vertically above the design reference position by a predetermined distance (1 mm to 4 mm), and the position is notified by the manufacturer. Therefore, the user can know the fitting point from the alignment reference mark. Since alignment reference marks often have a function of distinguishing between manufacturers and types of products, logos based on alphabets may be used. Also in this example, a logo indicating the manufacturer name is used, but of course any symbol may be used. The center of the two first alignment marks 25 is the design reference position RP, the line connecting the centers of the two first alignment marks 25 indicates the horizontal line, and the line orthogonal to the horizontal line and passing through the design reference position RP is the vertical direction. Show. The fitting point can be known from these design reference points and directions.

  In the present invention, at least two second alignment marks 35 are provided on one or both of the object side refractive surface 33 and the eyeball side refractive surface 32 of the auxiliary lens 3. In FIG. 8B, the second alignment mark 35 has a center at the same position as each of the first alignment marks 25 and is overlapped, and is a circular line having a size surrounding the first alignment mark 25. Is provided. That is, two circular lines are provided at a location where the centers are 34 mm apart from each other in the horizontal direction with the design reference point as the center. The midpoint between the centers of the two second alignment marks 35 is the design reference position RP, and a line connecting the centers of the two second alignment marks 35 indicates a horizontal line, and is a line orthogonal to the horizontal line and passing through the design reference position RP. Indicates the vertical direction. The fitting point can be found in the same way as the basic lens. The second alignment mark 35 indicates the design reference position RP of the auxiliary lens 3 corresponding to the design reference position RP indicated by the first alignment mark 25, and can indicate a certain direction, for example, the horizontal direction and / or the vertical direction. The first alignment mark 25 may be provided at a position unrelated to the position.

  As shown in FIG. 9, when the basic lens 2 and the auxiliary lens 3 are overlapped with each other with the design reference position RP and the horizontal direction aligned with each other, the basic lens 2 and the auxiliary lens 3 are accurately combined, and the combined spectacle lens The combined refractive power of 1 is a middle-to-near progressive power lens as intended. When viewed from the front side in the combined state, the second alignment mark 35 is arranged so as to surround the first alignment mark 25, and the respective centers are overlapped with each other. By visually recognizing that these alignment marks 25 and 35 are overlapped, it is possible to easily confirm that the alignment is accurately performed and combined. The two second alignment marks 35 of the auxiliary lens 3 shown in FIGS. 8 and 9 are circular and the vertical direction cannot be determined from the second alignment mark 35, but various information is hidden in the auxiliary lens 3. Since it is marked as a mark and the vertical direction can be easily determined from it, there is no inconvenience.

  It is preferable to provide the first alignment mark 25 and the second alignment mark 35 on the surface side where the basic lens 2 and the auxiliary lens 3 are in close contact with each other. For example, when the auxiliary lens 3 is attached to the front surface of the basic lens 2 as shown in FIG. 2, the first alignment mark 25 is directed to the refractive surface 23 on the object side of the basic lens 2, and the second alignment mark 35 is connected to the auxiliary lens 3. Are preferably provided on the refractive surface 32 on the eyeball side. In this case, in order to bring the basic lens 2 and the auxiliary lens 3 into close contact with each other, a progressive refractive surface is provided on the refractive surface 22 on the eyeball side of the basic lens 2 and the refractive surface 23 on the object side is a spherical surface or a toric surface. Is preferred. On the other hand, the auxiliary lens 3 has a refractive surface 32 on the eyeball side formed on a spherical surface or a toric surface that is substantially the same curved surface as the refractive surface 23 on the object side of the basic lens 2, and the refractive power of the basic lens 2 on the refractive surface 33 on the object side. It is preferable to give a refractive power to change the power. By providing the first alignment mark 25 and the second alignment mark 35 on the surface where the first alignment mark 25 and the second alignment mark 35 are in close contact with each other, the distance between them becomes extremely short, and the centers of the alignment marks 25 and 35 are accurately overlapped with each other. 3 can be accurately superimposed, and it can be easily confirmed that they are accurately superimposed.

  The first alignment mark 25 and the second alignment mark 35 can be provided by a known marking method. For example, any method such as a method of providing a plastic lens by transfer from a mold when cast polymerization, a ruled drawing method with a diamond pen, a method of drawing with a laser beam, or the like may be used. It is preferable to provide a hidden mark so as not to be noticeable by any method. A hidden mark is a thin mark that does not obstruct the field of vision, which is normally invisible but becomes visible when it is held over a light source.

  When the basic lens 2 is framed in the spectacle frame, the lens fitting point and the horizontal direction are confirmed by the layout printing printed with the first alignment mark (alignment reference mark) 25 as a reference or the reference. The eyeglass frame is cut into a lens shape and framed.

  In general, the auxiliary lens 3 is often cast into the same shape as the basic lens 2, but when the target lens is processed, the second alignment mark 35 is used as a reference or by layout printing printed on the basis thereof. The lens fitting point and horizontal direction are confirmed, and the lens is cut into the same shape as the basic lens. The second alignment mark 35 is also used for confirming the positioning reference position and direction when the auxiliary lens 3 is attached to the basic lens 2.

  Although the second alignment mark illustrated in FIGS. 8 and 9 is circular, for example, a triangle surrounding the first alignment mark, a polygon such as a quadrangle, and a horizontal direction so that the vertical direction can also be indicated. The second alignment mark may be any symbol, such as a symbol composed of three lines in the vertical direction.

  In the combination spectacle lens capable of converting the design type of the present invention, as described above, both the basic lens 2 and the auxiliary lens 3 have progressive refractive surfaces. If it is not superposed at an accurate position, the desired optical performance cannot be obtained. If the basic lens 2 and the auxiliary lens 3 can be formed by edging, which is an edge printing process to fit the spectacle frame into the exact same outer shape, they can be overlapped with each other even if they are combined on the basis of the outer shape. It becomes possible to match, and the appearance will be good.

  Hereinafter, an embodiment of the target lens processing method of the present invention capable of processing the basic lens 2 and the auxiliary lens 3 into the exact same outer shape will be specifically described with reference to the drawings. FIG. 10 is a cross-sectional view of the lens showing the bonding process of the lens processing method of the present invention, and FIG. 11 is a front view of the lens for explaining the process of the lens processing method of the present invention.

  First, as shown in FIG. 11A, a circular basic lens 2 and a circular auxiliary lens 3 to be combined are prepared. In the embodiment shown in FIGS. 10 and 11, the basic lens 2 having progressive refractive power proposed by the present inventor and an auxiliary having progressive refractive power capable of converting the design type of the basic lens 2 and the like. A combination spectacle lens 1 composed of a lens 3 is shown. In FIG. 11, the aberration distribution of each lens is schematically shown by a broken line. In the illustrated lens, the basic lens 2 is a progressive power lens of a perspective type, and the combined refractive power of the combination spectacle lens 1 combined with the auxiliary lens 3 is a middle type. Further, a progressive refracting surface is provided on the eyeball side refracting surface 22 of the basic lens 2, and an object side refracting surface 23 is formed into a spherical surface. The refracting surface 32 on the eyeball side of the auxiliary lens 3 is formed on the same spherical surface as the refracting surface 23 on the object side of the basic lens 2, and the refracting power for changing the refracting power of the basic lens 2 is given to the refracting surface 33 on the object side. Yes. By using the basic lens 2 and the auxiliary lens 3, the eye-side refractive surface 32 of the auxiliary lens 3 can be brought into close contact with the object-side refractive surface 23 of the basic lens 2.

  On the object-side refractive surface 23 of the basic lens 2 of the progressive addition lens, as shown in FIG. 11A, as a first alignment mark, a design reference point serving as a reference for defining a fitting point or a fitting point. S-shaped logo alignment reference marks 25 for indicating the horizontal direction are provided as hidden marks at two locations. As described above, the alignment reference mark 25 is required to be provided on the progressive-power lens according to ISO and JIS regulations, and the alignment reference mark 25 is determined to be two places on the lens at a horizontal distance of 34 mm. . An intermediate position between the two alignment reference marks 25 is a design reference point serving as a reference for defining a fitting point or a fitting point, and is indicated by an intersection of a horizontal reference line and a vertical reference line indicated by a virtual one-dot chain line.

  On the refractive surface 32 on the eyeball side of the auxiliary lens 3, as shown in FIG. 11A, a second alignment mark 35 is provided as a hidden mark at a position overlapping the alignment reference mark 25 of the basic lens 2. The illustrated second alignment mark 35 is a circular line surrounding the alignment reference mark 25, but the second alignment mark 35 may be any figure. The distance between the centers of the second alignment marks 35 is 34 mm in the horizontal distance. The midpoint of the line connecting the centers of the two second alignment marks 35, 35 is a design reference point serving as a reference for defining the fitting point or the fitting point of the auxiliary lens 3.

  In the target lens processing method of the present invention, it is necessary to accurately position the basic lens 2 and the auxiliary lens 3 in the positioning step. An eyeball side refracting surface 32 of the auxiliary lens 3 is disposed close to the object side refracting surface 23 of the basic lens 2, and as shown in FIG. 11B, the alignment reference of the basic lens 2 as viewed from the optical axis direction. The auxiliary lens 3 or the basic lens 2 is moved to a relative position so that the mark 25 is surrounded by the second alignment mark 35 of the auxiliary lens 3. As a result, the center of the alignment reference mark 25 and the center of the second alignment mark 35 coincide, the design reference position of the basic lens 2 and the design reference position of the auxiliary lens 3 match, and the horizontal directions match each other. That is, the fitting points coincide with each other, and the relative positions of the refractive surfaces of the basic lens 2 and the auxiliary lens 3 are accurately positioned.

  After the positioning, an adhesive layer 4 is provided in a bonding process using a double-sided pressure-sensitive adhesive tape or the like in a region within the target lens shape processing at the center of the basic lens 2 or the auxiliary lens 3. Then, the auxiliary lens 3 is pressed against the basic lens 2 while maintaining the relative position between the basic lens 2 and the auxiliary lens 3, and the auxiliary lens 3 is attached to the basic lens 2 through the adhesive layer 4 as shown in FIG. And fix them so that their positions do not shift. The adhesive layer 4 usually has a strong adhesive force in order to facilitate the peeling. However, the adhesive layer 4 is cured by, for example, irradiating with ultraviolet rays, an electron beam, and the like, so that the adhesive force is greatly reduced and can be easily peeled off. It is preferable to use a pressure-sensitive adhesive having characteristics.

  Next, in the target lens processing step, the basic lens 2 and the auxiliary lens 3 are bonded to each other so that both lenses are fitted in the spectacle frame. Processing. The alignment reference mark 25 is used as a processing reference point indicating the reference position and direction of the target lens processing during target lens processing. As shown in FIG. 11 (c), the basic lens 2 and the auxiliary lens 3 are processed into the same outer shape by the target lens shape processing.

  After processing the target lens shape, the adhesive layer 4 between the basic lens 2 and the auxiliary lens 3 is irradiated with ultraviolet rays to greatly reduce the adhesive strength of the adhesive layer 4, and as shown in FIG. 2 and the auxiliary lens 3 are separated. The separated basic lens 2 is used by being attached to a spectacle frame. The auxiliary lens 3 is used by being detachably attached to the basic lens 2 when necessary.

  As described above, the target lens processing method of the present invention performs target lens processing while the basic lens and the auxiliary lens are bonded together. If the basic lens and auxiliary lens are processed separately as in the past, processing errors will occur in each processing, and the processing error will be added when combined in the frame based on the external shape. The required assembly accuracy of the basic lens and the auxiliary lens cannot be ensured, the optical performance due to the combination of the basic lens and the auxiliary lens is deteriorated due to an assembly error, and the predetermined optical performance may not be exhibited. On the other hand, according to the target lens processing method of the present invention in which the target lens and auxiliary lens are bonded together, the processing error at the time of target lens processing is not added and the outer shape is stored in the frame. Assembly accuracy can be ensured when combined according to the standard. Further, it is possible to process the basic lens and the auxiliary lens into the same outer shape. By making the basic lens and the auxiliary lens have the same outer shape, it is possible to combine the basic lens and the auxiliary lens at an accurate position on the basis of the outer shape. Further, if the basic lens and the auxiliary lens have the same outer shape, the attached auxiliary lens becomes inconspicuous, which is preferable in terms of appearance. Further, since both the basic lens and the auxiliary lens can be processed in a single processing process, the productivity is improved. Furthermore, if the basic lens and the auxiliary lens are bonded together, for example, by embedding a magnet or metal, or performing processing other than the target lens processing such as drilling, the positional accuracy of both the basic lens and the auxiliary lens is good. Processing can be performed.

  In the above description, the alignment reference mark of the hidden mark is used as the first alignment mark, and the alignment mark of the hidden mark is used as the second alignment mark. However, other marks may be used as long as they can be positioned, for example, You may make it provide a notch, an unevenness | corrugation, etc. in the peripheral edge and side surface of a lens.

The combination spectacle lens of the present invention can be used as a vision correction lens mainly for presbyopia with weak adjustment.
The auxiliary lens of the present invention can be used for applications such as changing the design type of a basic lens in combination with a basic lens for correcting visual acuity for presbyopia whose adjustment is weakened.
The lens shape processing method for a combination spectacle lens of the present invention can be used when processing a basic lens and an auxiliary lens into a shape attached to a spectacle frame.

  DESCRIPTION OF SYMBOLS 1 ... Combination spectacle lens, 2 ... Basic lens, 3 ... Auxiliary lens, 21 ... Main meridian, 31 ... Main gaze line, 22 ... Eye side refractive surface, 23 ... Object side refractive surface, 32 ... Eye side refractive surface, 33 ... Object side refracting surface, 201: first refracting portion, 202: second refracting portion, 203: progressive portion, 25: first alignment mark (alignment reference mark), 35: second alignment mark (alignment mark), RP: design Reference position.

Claims (6)

A first refracting part having a refractive power for viewing an object at a predetermined distance on either one of the refractive surfaces or both surfaces on the object side and the eyeball side, and a second refracting part having a refractive power different from the first refracting part And a basic lens having a progressive refractive surface having a progressive change in refractive power from the first refractive unit to the second refractive unit, and a progressive refractive surface, A combination spectacle lens formed by combining auxiliary lenses having
A combined spectacle lens in which the combined refractive power obtained by combining the basic lens refractive power of the basic lens and the auxiliary lens refractive power of the auxiliary lens is partially or entirely different from the basic lens refractive power,
The auxiliary lens is refracted by the auxiliary lens between the progressive start point of the basic lens or the progressive start point of the combined spectacle lens and the progressive end point of the basic lens or the progressive end point of the combined spectacle lens. The force has a local maximum or local minimum,
Wherein the progressive starting point in the combined spectacle lens is changed from the progressive starting point in the basic lens, or, that the terminating point of progressivity of the combined spectacle lens is changed from the terminating point of progressivity of the basic lens A combination eyeglass lens characterized by. The combination spectacle lens according to claim 1,
A combination spectacle lens, wherein a combination lens addition power in the combination spectacle lens is different from a basic lens addition power of the basic lens. The combination spectacle lens according to claim 1,
The basic lens has the progressive refractive surface on the refractive surface on the eyeball side, the refractive surface on the auxiliary lens side is formed on a spherical surface or a toric surface,
A combination spectacle lens, wherein a refractive surface of the auxiliary lens on the basic lens side is formed on a spherical surface or a toric surface that is substantially the same as the refractive surface of the basic lens on the auxiliary lens side. In the combination spectacle lens according to any one of claims 1 to 3,
First alignment marks indicating a design reference position and a predetermined direction are provided in at least two places on any refractive surface of the basic lens, and the design reference position is provided on at least two places on any refractive surface of the auxiliary lens. A combination spectacle lens characterized in that a second alignment mark indicating a predetermined direction is provided. The combination spectacle lens according to claim 4,
The combination eyeglass lens, wherein the first alignment mark is provided at a position indicating a fitting point and a horizontal direction. The combination spectacle lens according to claim 4,
The combination spectacle lens, wherein the second alignment mark is provided at each position overlapping the first alignment mark.

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