Abstract:
Eyeglass lens connector with single-operation interchangeable lenses. The configuration enables cutting lenses with the connector body alone mounted to the lens substrate, allowing eyeglasses to be assembled by utilizing the connector after the lens is cut on demand from a customer. The eyeglasses have a lens connector ( 1 ) connecting a lens ( 5 ) to an insertion piece of a lens connecting member ( 2 ), and an insertion hole ( 10 ) for the insertion piece ( 3 ). A guide groove for guiding a tip of the engagement piece ( 3 ) is provided along the opening end ( 13 ) of the insertion hole ( 10 ). The lens connector ( 1 ) is secured to the lens ( 5 ) by fastening two protruding fastening pins ( 32 ) into fastening holes ( 29 ) provided in the lens ( 5 ). The lens ( 5 ) is connectable to the lens connecting member ( 2 ) by squeezing the insertion piece ( 3 ) into the insertion hole ( 10 ).

Description:
BACKGROUND OF THE INVENTION 
     1. Technical Field 
     The present invention relates to a eyeglass lens connector with interchangeable lenses, and relates to eyeglasses with interchangeable lenses using the lens connector. In addition, the present invention relates to a lens forming substrate using the eyeglass lens connector. 
     2. Description of the Related Art 
     There are several types of eyeglasses for the intended use. For example, there are clip-on eyeglasses configured to enable sunglasses to be worn by detachably clipping them onto the main eyeglass frames. 
     Examples of clip-on eyeglasses include clip-on eyeglasses mounted to body eyeglasses via clips to be flippable as disclosed in 1. Japanese Unexamined Utility Model Application Publication S58-91721 and 2. Japanese Unexamined Patent Application Publication S50-120641, and clip-on eyeglasses mounted to body eyeglasses to be flippable via elastic curved engagement pieces that can be engaged to outer edges or inner edges of right and left lenses of the body eyeglasses as disclosed in 3. Japanese Unexamined Patent Application Publication 2003-241149. Alternatively, other clip-on eyeglasses equipped with both attachment lenses for covering both lenses of the body eyeglasses from the front surface side are detachable to the lens frame of the body eyeglasses, but not flip-up type as disclosed in 4. Japanese Utility Model Registration 3117580 and 5. Japanese Utility Model Registration 3125901. 
     Among these clip-on eyeglasses, when the eyeglasses configured to be flippable are mounted to the body eyeglasses, the eyeglasses can be used as sunglasses when the clip-on eyeglasses are down; in the meantime, when a user enters a dark place, such as a tunnel during driving a car, flipping-up the lenses enables securing and seeing the field of vision with the body eyeglasses and to secure safe driving. 
     In addition, flip-up eyeglasses where lenses are mounted to upper cord parts to be flippable so as to cover the lower portions (portions facing eyes) of the upper cord parts of the both front frames of eyeglasses whose right and left upper cord parts are connected with a connector as disclosed in Japanese Unexamined Utility Model Application Publication S58-100315 are also proposed. If the flip-up eyeglasses are, for example, eyeglasses for farsightedness including reading eyeglasses, when the flip-up eyeglasses are down, a user can something positioned away, such as scenery. In the meantime, when seeing something closer, such as reading newspaper or books, the user can easily see by flipping the lenses up. Further, when the flip-up eyeglasses are sunglasses, they can be used as sunglasses when the eyeglasses are down; in the meantime, when a user enters a dark place, such as when entering a tunnel when driving a car, he/she can secure the field of vision with the naked eye by flipping the eyeglasses up, and safety driving can be secured. 
     In such clip-on eyeglasses and flip-up eyeglasses, as one mode of configuration to mount lenses to right and left connecting pieces of the lens connecting member, in addition to the eyeglasses where lenses are filled into right and left rims, simple mounting structures where lenses are secured to the connecting pieces using rivets or screws, for example, as shown in FIG. 2 of Patent Literature 1, FIG. 1 of Patent Literature 2, FIG. 6 of Patent Literature 3, FIG. 2 of Patent Literature 4, FIG. 3 of Patent Literature 5 and FIG. 1 of Patent Literature 6 are also provided. 
     Needless to say, in clip-on eyeglasses and flip-up eyeglasses where lenses are fitted into the rims, and even with simple clip-on eyeglasses and flip-up eyeglasses, because the lenses are secured to a mounting piece by riveting or a lapped flat seam, lens exchange was not originally included in the design. In addition, after riveting and a lapped flat seam, because the lenses cannot be cut due to these members, the lens shape is determined first and cut, and after the riveting and lapped flat seam are applied, it is necessary to supply eyeglasses to the retail stores in the finished state. However, actual customers desire different lens shape or eyeglasses with a prescription; therefore, the desire of the customers cannot be satisfied on the spot. 
     Further, different eyeglasses may be appropriately used for different purposes. For example, it is preferable to use light-shielding sunglasses, especially sunglasses with polarizing lenses in the case of outdoor activities, such as fishing, golf, winter sports or driving. In such a case, a user wears normal eyeglasses or sunglasses until he/she arrives at the destination, and wears sunglasses with polarizing lenses at the destination. Further, in daily life, people use different sunglasses with different colors for the purpose of fashion. 
     However, since conventional eyeglasses do not change lenses at a store before purchase as described above and exchange is not expected by replacement of the lenses even after purchase, the store cannot respond to a customer&#39;s need and it is uneconomical to have a plurality of eyeglasses for use. 
     BRIEF SUMMARY OF THE INVENTION 
     The present invention has been developed by taking the conventional problems into consideration, and the objective is to provide a eyeglass lens connector where eyeglasses matching the purpose of use can be economically configurable by using different eyeglasses for different purposes if there is an assortment of a plurality of types of lenses. Further, the objective is to provide eyeglasses with a simple configuration and with interchangeable lenses using the lens connector. In addition, the objective is to provide a substrate for lens formation enabling easy and accurate cut-processing in a state in which use is made of a eyeglass lens connector. 
     In order to solve the problems, the present invention adopts the following means: 
     Namely, an eyeglass lens connector (referred to simply as a lens connector hereinafter) involving the present invention is a lens connector for connection with an insertion piece of a lens-connecting member, is entirely made of plastic, and is furnished with a connector body for anchored attachment onto a lens surface. The connector body is provided with an insertion hole into which the insertion piece is detachably insertable, and, protruding on the lens-ward edge of the open end of the insertion hole, with a floor guide-part for guiding the insertion piece toward the open end. The connector body is provided with fastening pins, jutting from an attachment surface of the connector body where it anchors onto the lens surface, for insertion into a proximal end, and directed toward a distal end, of fastening holes penetrating the lens, wherein the fastening pins are formed with a retaining protrusion, for engaging with the rim area surrounding the distal end of the fastening holes in the lens, by the portion of the pins jutting out from the distal end, with the pins having been inserted into the fastening holes, being crushed. 
     In the lens connector, lateral guide pieces may jut out from the both margins of the opening end. 
     In the lens connector, the lateral guide pieces jut out from both margins of the opening end on the floor guide-part, and the inner surface facing both lateral guide pieces may be configured so as to expand a gap between guiding surfaces tilting outward from the opening end toward the opening end tip side. 
     In the lens connector, an engagement concave portion or an engagement hole is established in the inner surface of the insertion hole, and may be configured such that the engagement protrusion placed in the insertion piece can be engaged with the anchored attachment surface in the fitted state. 
     In the lens connector, an engagement hole that can be engaged with the engagement protrusion in the fitted state may be established on the engagement surface facing the anchored attachment surface in a state in which the insertion pieces are completely inserted into the insertion holes. 
     In the lens connector, the fastening pins may jut out at the floor guide-part. 
     In the lens connector, the anchored attachment surface of the anchored attachment surface to a lens may be formed to be a curved surface that makes contact with the lens surface. 
     The lens connector may be configured such that a groove (engagement expansion slot) that is opened at the opening end and expands toward the bottom of the insertion hole is placed in the engagement surface part facing the anchored attachment surface; an engagement protrusion placed in the insertion piece is fittable into the engagement expansion slot; and a predetermined insertion state of the insertion piece into the insertion hole can be obtained in a state in which the tip of the engagement protrusion comes into contact with the groove tip of the engagement expansion slot. 
     The lens connector may be configured such that an engagement concave portion is established on the groove side surface of the engagement expansion slot; the engagement protrusion placed in the engagement protrusion is engaged with the engagement concave portion in the fitted state while the tip of the engagement protrusion comes into contact with the groove tip of the engagement expansion slot. 
     It may be configured such that the fastening pin that juts out from the anchored attachment surface is one; the transverse section of the fastening pin is formed to be noncircular; the fastening pin is inserted into a noncircular fastening hole matched with the transverse section shape of the fastening pin placed in the lens; and a retaining protrusion that is engaged with the periphery of the other end of the fastening hole is formed by crushing the protrusion that protrudes from the other end of the fastening hole. 
     The eyeglasses with interchangeable lenses (hereafter, referred to as eyeglasses) relating to the present invention are equipped with a lens connecting member where right and left insertion pieces horizontally protruding in the reverse direction are placed and lenses with a connector where the lens connector is secured to the lenses. The eyeglass lens connector are secured to the edge on the lens surface by making the hole center of the insertion holes in the horizontal state. Concurrently, the insertion pieces are detachably inserted into the insertion holes. Then, it is characterized such that the fastening pins jotting out from the anchored attachment surface are inserted into the fastening holes penetrating through the upper edge portions from one end to the other end, and the retaining protrusion engaged with the periphery of the other end is formed by crushing the protrusion protruding at the other end. 
     The eyeglasses are equipped with a lens connecting member where right and left insertion pieces protruding downward are placed, and lenses with a connector where the eyeglass lens connector are secured to the lenses, and the eyeglass lens connector is secured to the edge portion inside the lens surface (closer to the nose) by vertically adjusting the hole center of the insertion hole. Concurrently, the insertion pieces are detachably inserted into the insertion holes. Further, it may be configured such that the fastening pins jotting out from the anchored attachment surface are inserted into the fastening holes penetrating through the edge portions inside (closer to the nose) from one end toward the other end, and a retaining protrusion to be engaged with the periphery of the other end is formed by crushing the protrusion protruding at the other end. 
     The lens forming substrate relating to the present invention is characterized such that the eyeglass lens connector are secured to a plastic lens forming plate that can form a lens with the required shape by cut processing. 
     The present invention works successfully as described below. 
     (1) Since the lens connector relating to the present invention is entirely made of plastic and is equipped with fastening pins, insertion of the fastening pins into fastening holes established in the lenses and crushing the projected portions enables easy and certain securement to the lenses. 
     Since the lens connector has insertions holes where insertion pieces of the lens connecting member can be detachably inserted, the lenses are interchangeable. Hence, eyeglasses matched with an intended use are economically configurable. 
     Further, since a floor guide-part of the lens connector juts out, the insertion pieces can be inserted into the insertion holes without scratching the lenses naturally by using the guiding effect of the floor guide-part. 
     (2) Further, since the eyeglasses relating to the present invention are equipped with lenses with a connector where the lens connector is secured to the lenses via fastening pins, mounting the lenses with a connector to the insertion pieces of the lens connecting members to be detachable, a clip-on environment with interchangeable lenses (both flip-up and non-flip-up) and the flip-up eyeglasses can be easily configured. 
     Therefore, according to the present invention, while the eyeglasses matched with an intended use are used with the lens connector as is, the eyeglasses can be easily configured merely by exchanging the lenses, which is economical compared to the case of having an assortment of many eyeglasses. 
     (3) In the lens forming substrate relating to the present invention, the lens connector is connected to a plastic lens forming plate enabling the formation of lenses of the required shape by cut processing. Therefore, according to the lens forming substrate, after a required lens outline is marked to a lens forming plate in a state in which the lens forming plate is connected to the insertion pieces of the lens connecting member via the lens connector, detachment of the lens forming substrate from the insertion piece enables easy and accurate cutting of the lens forming plate to a desired lens shape, and unique eyeglasses can be configured. 
     (4) While an engagement concave portion or an engagement hole is established in the inner surface of the insertion hole, when an engagement protrusion that can be engaged with the engagement concave portion or the engagement hole is established in the insertion piece, complete insertion of the insertion piece into the insertion hole can be confirmed. Concurrently, certain retention of the insertion piece can be attempted. 
     (5) When lateral guide pieces jut out from both margins of the opening end, the end of the insertion piece can be more smoothly guided toward the opening end of the insertion hole by the guiding effect of both lateral guide pieces without generating shear. In this case, when an inner surface facing both lateral guide pieces is regarded as a guiding surface tilting outward from the opening end toward the opening end tip side and a gap between both guiding surfaces is expanded toward the opening end tip side, the gap between the edges of both lateral guide pieces can be further expanded. Therefore, the tips of the insertion pieces can be inserted into the expanded gaps between the tips, and the insertion pieces can be smoothly guided. 
     (6) When the fastening pins jut out by the floor guide-parts, the floor guide-parts can be secured to the lens surface in a safer secured state. 
     (7) When the anchored attachment surface of the anchored attachment surface portion to the lens is formed to be a curvature that can make contact with the surface of the lens, the stability of the securing state of the lens connector to the lens can be improved. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
         FIG. 1  is an exploded perspective view showing the lens connector relating to the present invention. 
         FIGS. 2A and 2B  are perspective views showing the lens connector. 
         FIGS. 3A and 3B  are cross sectional views of the lens connector. 
         FIGS. 4A through 4C  are cross sectional views for explaining a process to secure the lens connector to a lens. 
         FIGS. 5A and 5B  are perspective views showing a process to mount a lens with a connector onto the lens connecting member. 
         FIGS. 6A through 6C  are a cross sectional views for explaining a process to insert an insertion pieces of the lens connecting member into an insertion hole of the lens connector secured to the lens. 
         FIG. 7  is a front view showing flip-up type clip-on eyeglasses formed by connecting lenses to right and left insertion pieces of the lens connecting member. 
         FIG. 8  is a side view showing the state where the clip-on eyeglasses are mounted to body eyeglasses to a state where attachment lenses are down. 
         FIG. 9  is a side view showing a state where the attachment lenses are flipped up. 
         FIG. 10  is a perspective view showing the lens connecting member. 
         FIG. 11  is a perspective view showing a state where the lenses with a connector are mounted into the insertion pieces of the lens connecting member. 
         FIG. 12  is a front view showing clip-on eyeglasses where lenses formed by successively connecting both attachment lenses. 
         FIG. 13  is a front view showing the lens connecting member. 
         FIG. 14  is a front view showing the lens. 
         FIG. 15  is a cross sectional view for explaining a process to secure the lens connector to the lenses. 
         FIG. 16  is a cross sectional view showing a state where the lens connector is secured to the lenses. 
         FIG. 17  is a front view for explaining a process to mount the lenses formed by successively connecting both attachment lenses to the lens connecting member. 
         FIG. 18  is a front view showing flip-up eyeglasses where the lenses with a connector are mounted to the lens connecting member. 
         FIG. 19  is a plane view thereof. 
         FIG. 20  is a perspective view showing a lens forming substrate. 
         FIG. 21  is a perspective view showing the lens forming plate and the lens connector. 
         FIGS. 22A and 22B  are cross sectional views showing an engagement state between the insertion pieces and the insertion holes and another mode of fastening pin. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Embodiment 1 
     In  FIGS. 1 to 3 , a lens connector  1  relating to the present invention is to be connected to insertion pieces  3  of a lens connecting member  2 , and is entirely made of plastic and equipped with a connector body  6  secure to lenses  5 . The insertion pieces  3  are, for example, rectangular-plate-state, and a spherical engagement protrusion  9  juts our in the center of a surface  7 . 
     The lens connector  1  can be formed using plastic, such as polyacetal, nylon, polycarbonate or ABS resin. 
     In the lens connector  1 , as shown in  FIGS. 1 to 4 , insertion holes  10  whose bottom  17  is closed where the insertion pieces  3  can be detachably inserted are placed, respectively, and are concurrently secured to the lens  5  by a anchored attachment surface  12  facing the surface of the lens (inner surface  11  or outer surface  23 ). Then, a floor guide-part  16  juts out from an edge  15  at the lens side of the opening end  13  of the insertion hole  10 . 
     Specifically explaining a connector body  6  with reference to  FIGS. 1 to 4 , a comparatively long and flat rectangular box is exhibited in the insertion direction of the insertion pieces  3 , and the insertion hole  10  whose bottom  17  ( FIG. 3B ) for inserting the insertion pieces  3  to be detachable is closed, one end of which is opened and formed to be lengthwise in the axis line direction of the connector body  6 . The insertion hole  10  has a rectangular-shaped cross sectional mode. 
     Then, the guide pieces  16  that guide the tip  20  ( FIG. 4C ) of the insertion pieces  3  toward the opening end  13  jut out in the successive connected state, and the anchored attachment surface  21  at the lens side and an insertion surface  22  facing the anchored attachment surface  21  in the anchored attachment surface  12  form a successive connecting flat surface without any step. The connector body  6  is secured to the surface ( 11  or  23 ) of the lens  5  by the anchored attachment surface  21 .  FIGS. 1 and 4C  show the state to be secured to the inner surface  11  of the lens  5 . 
     In this embodiment, as shown in  FIGS. 2 and 3B , the lateral guide piece  26  juts out from the facing margin  25  of the opening end  13  on the floor guide-part  16 . The inner surfaces of the both lateral guide pieces  26 , as shown in  FIG. 3B , are guiding surfaces  27  which tilt outward from the opening end  13  toward the open end edge side, and a gap between both guiding surfaces  27  and  27  expands toward the opening end tip side. 
     Further, two fastening pins  32  are positioned at both sides of the anchored attachment surface  21  of the connector body  6  in the lengthwise direction, and jut out from two fastening holes  29  ( FIG. 1  and  FIG. 4A ) placed in the lens  5  at a small gap so as to penetrate from one end  30  toward the other end  31 . In this embodiment, since a fastening pin  32   a  at the opening end  13  side juts out from the anchored attachment surface  21  in state whose portion exists in the floor guide-part  16 , as shown in  FIG. 4C , the floor guide-part  16  is stably secured to the lens  5 . 
     While the fastening pins  32 , as shown in  FIG. 4B , are inserted into the fastening holes  29  from one end  30 , a protrusion  33  that protrudes at the other end  31  of the fastening holes  29  is crushed. Whether the protrusion  33  is heated and crushed or is mechanically crushed using a deformation property of plastic without heating does not a matter. As shown in  FIG. 4C , a retaining protrusion  36  engages with the periphery  35  of the other end  31  by crushing as described above. As shown in  FIGS. 4C and 6C , the lens connector  1  is baffled by such swage and is secured to the lens  5 . 
     Further, as shown in  FIGS. 2A and 6C , an engagement hole  39  is established that is engaged with an engagement surface  37  facing the anchored attachment surface  12  of the connector body  6  in the state of fitting into the engagement protrusion  9  while the insertion pieces  3  are completely inserted into the insertion holes  10 . In this embodiment, the engagement hole  39  is placed in the center portion of the engagement surface  37  in the lengthwise direction. 
     Illustrating the dimension of the main components of the lens connector  1  having such configuration, as shown in  FIGS. 3A  and B, the length L 1 , the width L 2  and the thickness L 3  of the connector body  6  in the direction of axis are set at 9 mm, 3 mm and 1.8 mm, respectively. Concurrently, the length L 4  of the insertion hole  10  is set at 7 mm, and the hole width L 5  is set to be substantially equal to the width of the insertion pieces  3 . Further, the diameter L 6  of the engagement hole  39 , the protruding length L 7  from the opening end  13  of the floor guide-part  16 , and the protruding length L 8  from the opening end  13  of the lateral guide piece  26  are set at 2 mm, 1.5 mm and 0.9 mm, respectively. Further, the diameter L 9  of the fastening pin  32  is sect at 1.25 mm, and the protruding length  10  of the fastening pin  32  is set to be comparatively longer so as to correspond to different length thickness, for example, at 2.6 mm. Further, the center distance of both fastening pins  32  and  32  is set at 6 mm. 
     Then, the tip  20  of the insertion pieces  3 , as shown in  FIGS. 4C and 6A , is inserted into a guide groove  41  ( FIG. 2 ) formed by the floor guide-part  16  and the both lateral guide pieces  26 , the tip  20  is smoothly guided toward the opening end  13  of the insertion hole  10 . If the insertion pieces  3  is squeezed toward the insertion hole in the guided state, since the insertion surface  22  is formed to be a successive flat surface without any step, as shown in  FIG. 5B , the insertion pieces  3  is inserted into the insertion hole  10  naturally without damaging the surface ( 11 ) of the lens  5 . In association with this insertion, the engagement surface part  37  is pressed by the engagement protrusion  9  and elastically deformed. Finally, as shown in  FIG. 6C , the lens with a connector  46  as shown in  FIG. 5B  is configured by fitting the engagement protrusion  9  into the engagement hole  39 . 
     Then, the insertion hole  10 , as shown in  FIG. 3B , has a configuration whose bottom  17  is closed and one end is opened, in other than that of a through-hole. If formed as a through-hole, a case where the end portion of the insertion pieces  3  is in the protruded state from the end portion of the through-hole may occur, and a case where the mounting position of the lens to the lens connecting member  2  is difficult to be accurately determined may occur. If the insertion pieces  3  are completely inserted into the insertion holes  10  as shown in  FIG. 5C , the mounting position of the lens  5  to the lens connecting member  2  can be accurately determined. In addition, any incident where the protrusion damages the lens or a user may be injured by the protrusion can be avoided. 
     Furthermore, in order to make the lens connector  1  unnoticeable in the state to be secured to the lens  5 , a lens connector colored to the similar colors may be used. For example, the connector may be colored brown or gray. 
     Embodiment 2 
       FIGS. 7 to 9 ,  12  and  18  show an embodiment of eyeglasses with interchangeable lenses  42  configured by using the lens connector  1  having such configuration (hereafter, referred to as eyeglasses), and hereafter, first eyeglasses  42   a , second eyeglasses  42   b , third eyeglasses  42   c  and fourth eyeglasses  42   d  are explained. 
     Configuration of First Eyeglasses 
     The first eyeglasses  42   a  shown in  FIGS. 7 to 9  are flip-up type clip-on eyeglasses to be detachably mounted to the body eyeglasses  43 , and as shown in  FIGS. 7 and 10  to  11 , are equipped with the lens connecting member  2  formed by establishing both insertion pieces inversely protruding in the horizontal direction and a lens with a connector where the lens connector  1  is secured to the edge portion  45  on the inner surface of attachment lens  5   a . The attachment lens  5   a  is formed as a light-shielding polarized plastic lens. 
     The lens connecting member  2  is made of metal in this embodiment, and as shown in  FIGS. 7 and 10 , a rotary axle  49  is inserted into a tubular support shaft  47  extending in the horizontal direction, and the rotary axle  49  can be turned around the axis line in forward and reverse directions, and both ends  50  of the rotary axle  49  protrude from the both ends  48  of the tubular support shaft  47 , and the both tip side parts have required width in the vertical direction and are formed as the insertion piece  3  having the long rectangular-plate in the horizontal direction. As shown in  FIG. 1 , a spherical engagement protrusion  9  juts out from the center of the inner surface (surface at the face side) of the insertion piece  3 . Further, curved elastic lens clips  55  placed along the inner edge portion of both the body lenses  52  of the body eyeglasses  54  are provided on both end portions  51  of the tubular support shaft  47 . 
     Further, when configuring the lens with a connector  46 , first, as shown in  FIG. 1 , the two right and left fastening holes  29  penetrate through in association with the arrangement of the two fastening pins  32  in the edge portion  45  of the attachment lens  5   a . Then, when securing the lens connector  1  to the edge portion  45  of the inner surface  11  of the attachment lens  5   a , as shown in  FIG. 4B , the center of the insertion hole  10  is adjusted to be in the horizontal state and the fastening pins  32  are inserted into the fastening hole  29  from one end  30  to the other end  31 . While the fastening pins  32  are inserted into the fastening holes  29  as shown in  FIG. 4B , the protrusion  33  protruding at the other end  31  is crushed as shown in  FIG. 4C . The protrusion  33  may be welded, or may be compressed without heating. The retaining protrusion  36  is formed to engage with the periphery  35  of the other end  31 . As shown in  FIGS. 6C and 11 , a lens with a connector  46  where the lens connector  1  is secured to the edge portion  45  on the inner surface  11  of the attachment lens  5   a  is configured by such swage. 
     As explained in Embodiment 2, both attachment lenses  5   a  are mounted to the lens connecting member  2  by inserting the tips  20  of the insertion pieces  3  into the connector, and the flip-up type clip-on eyeglasses  42   a  are configured. 
       FIG. 8  shows a state where the flip-up type clip-on eyeglasses  42   a  are mounted on the body eyeglasses  53  by engaging the curved elastic lens clips  55  with the inner edge portions  54  of the both body lenses  52  of the body eyeglasses  43 .  FIG. 8  shows a state where the right and left attachment lenses  5   a  are turned downward and are down. The down state is stably maintained by the engagement in conjunction with a spring action. In this state, the right and left attachment lenses  5   a  cover the front surface of the right and left body lenses  52  of the body eyeglasses  43 . For example, in the case of outdoor activity, such as fishing, golf, winter sports or driving, the state where the attachment lenses  5   a  are down enables the configuration of sunglasses with polarized lenses. Further,  FIG. 9  shows the state where both attachment lenses  5   a  are flipped up. The flipped-up state is stably maintained by the engagement in conjunction with the spring action. For example, when a user stays inside where sunglasses are not required or a driver enters into a tunnel while driving a car, the user/driver can secure the field of vision by the body eyeglasses  43  by flipping up the lenses, securing driving safety. 
     Further, since the insertion pieces  3  can be inserted into the insertion holes  10  to be detachable, lenses with a connector  46  can be detached from the lens connecting member  2 . In such case, while the lens connecting member  2  is used as is, the lenses with a connector  46  using lenses with different functions are selected for a required purpose and eyeglasses matched with an intended use can be configured by mounting the lenses to the lens connecting member  2 . For example, if two types of lenses, first lenses with a connector using a normal light-shielding light-colored lenses and second lenses with a connector using polarized light-shielding dark-colored lenses, are prepared, when performing outdoor activity, such as fishing, golf, winter sports or driving, a user wears sunglasses configured by mounting the first lenses with a connector to the lens connecting member  2 , and can be fashionable until reaching the destination. After arriving at the destination, the first lenses with a connector are detached from the lens connecting member  2  and the sunglasses with polarized lenses are configured by mounting the second lenses with a connector instead, and the user can wear the sunglasses for activity. In daily life, if different light-shielding light-colored lenses are used for different purposes, the user can be fashionable. Further, even if the lenses are scratched, exchange is easy. 
     Configuration of Second Eyeglasses 
     The second eyeglasses  42   b  shown in  FIG. 12  relate to another embodiment of the flip-up type clip-on eyeglasses detachably mounted on the body eyeglasses  43 , and are equipped with the lens connecting member  2  where the right and left insertion pieces  3  protruding downward (protruding obliquely downward in this embodiment) are placed and the lenses with a connector  46  where the lens connector  1  is secured to the edge portion  57  inside the inner surface  11  of the attachment lens  5   a  (at the side closer to the nose) by adjusting the hole center of the insertion holes  10  vertical (in obliquely vertical direction in this embodiment). The attachment lenses  5   a  are a unitary piece where right and left attachment lenses are continuously joined by a bridge portion  38 , and for example, constructed as a plastic polarized lens. 
     The lens connecting member  2  is made of metal in this embodiment, and as shown in  FIG. 13 , the rotary axle  49  is inserted into the horizontally-extending tubular support shaft  47 , and the rotary axle  49  can be turned around the axis line in the forward and reverse directions. Both ends portions  50  of the rotary axle  49  are composed of right and left arms  59  that protrude from both ends  48  of the tubular support shaft  47  and extend downward, and that can be elastically deformed, and the insertion pieces  3  that are connected at the lower ends of the right and left arms  59  and extend obliquely downward, and that have a slim rectangular plate. The engagement protrusion  9  and the curved elastic lens clips  55  are similar to those of the first eyeglasses as shown in  FIG. 12 , and the lens with a connector  46  where the lens connector  1  is secured in the edge portion  57  inside the inner surface  11  of the attachment lens is configured as shown in  FIG. 17 . 
     Then, when mounting a lens with a connector  46  having such configuration to the right and left insertion pieces  3  and  3  of the lens connecting member  2 , the insertion means  3 , as shown in  FIGS. 6B  and C and  FIG. 17 , are inserted into the insertion holes  10  naturally by being smoothly guided by the guide groove  41  in association of required elastic deformation of the arms  59 . In association with this insertion, the engagement surface  37  is pressed by the engagement protrusion  9  and elastically deformed, and at last, the engagement protrusion  9  is fitted into the engagement hole  39 . Such fitted state is a state where the insertion pieces  3  are completely inserted into the insertion holes  10  in  FIG. 16 . 
     The flip-up type clip-on eyeglasses  42   b  shown in  FIG. 12  where completely fitting the insertion pieces  3  into the insertion holes  10  can be confirmed. Concurrently, the engagement of the engagement protrusions part  9  into the engagement hole  39  can certainly retain the insertion pieces  3 , and the right and left attachment lenses  5   a  are mounted to the lens connecting member  2  is configured. 
     The clip-on eyeglasses  42   b  having such configuration, as similar to  FIGS. 8 and 9 , is mounted to the body eyeglasses  43  by engagement of the curved elastic lens clips  55  to the inner edge portion  54  of the right and left body lenses  52  of the body eyeglasses  43 , and a state where the attachment lenses  5   a  are turned downward and are down and another state where the attachment lens  5   a  is flipped up are obtained. 
     Further, similarly, selection of the lenses with a connector using lenses with different functions as needed and mounting the lenses to the lens connecting member  2  enable to a configuration of eyeglasses matched with an intended purpose as similar to the explanation of the first eyeglasses  42   a.    
     Configuration of Third Eyeglasses 
     The third eyeglasses  42   c  shown in  FIGS. 18 to 19  are a flip-up type formed, for example, as sunglasses, and when the flip-up eyeglasses  42   c  are turned downward and are down, the state where the sunglasses are clipped on is obtained. Concurrently, when the flip-up type eyeglasses  42   c  are flipped up, the state of no eyeglasses (viewing with naked eyes) can be obtained. 
     As shown in  FIG. 19 , inner ends  61  of right and left bowed upper-frame sections  60  are attached to either side of the center of the tubular support shaft  47  by brazing, and as shown in  FIG. 18 , pad arms  63  having nose pads  62  are formed on, as bent continuations of, the inner ends  61 . Further, temple connecting pieces  66  are curved and formed on outer ends  65  of the right and left bowed upper-frame sections  60  as shown in  FIG. 19 , and a temple  67  is mounted to the temple connecting pieces  66  to be openable/closable. 
     The right and left lenses  5  can be flipped up as similar to  FIG. 9 . This flipped-up state is stably maintained by the engagement in conjunction with the spring action. For example, when a user stays inside not requiring sunglasses or when a driver enters into a tunnel during driving a car, he/she can see things with naked eyes by flipping up the lenses, and the safety driving can be secured. 
     Embodiment 3 
       FIGS. 20 to 21  show an embodiment of a lens forming substrate  69  relating to the present invention, and the lens connector  1  is secured to a plastic lens forming plate  70  enabling to form a lens with the required shape by cut processing. 
     The lens forming plate  70  is formed, for example, to be a rectangular plate with a lens curve, and the lens connector  1  is secured to one margin portion of the inner surface (a portion to be an edge on the inner surface of the cut formed lens) by adjusting the hole center of the insertion hole  10  along the one side edge  71 . The securing method is similar to the other embodiments. 
     Then, when forming a lens with a connector  46  where the lens connector  1  is secured, when the insertion pieces  3  are inserted into the insertion holes  10  of the lens connector  1  and the engagement protrusions  9  and the engagement holes  39  are fitted and engaged, a required lens outline is marked, for example, as shown with a dashed line in  FIG. 20 , a required lens outline  75  is marked so as to enable to cut-process the desired lens shape on the surface  73  of the lens forming plate  70 . 
     After the lens outline  75  is marked, the lens forming substrate  69  is detached from the lens connecting member  2 , and the lens is cut along the lens outline  75  with scissors in this state, and cut portions are polished. For example, the lens is cut to the preferred shape, such as a lens with notch as shown in  FIG. 18 , heart-shaped or rhombus, and the lenses with a connector  46  with the required shape are formed. Since such cutting work can be conducted by separating the lens formatting plate  70  from the lens connecting member  2 , the cutting work can be easily and accurately conducted. If the lens forming plate  70  is secured to the lens connecting member  2  to be rivet-state as in the conventional example, cutting work has to be conducted in a state in which lens forming plate  70  is secured to the lens connecting member  2 ; however, this limits the cutting work, and a problem where cutting cannot be conducted easily and accurately occurs. 
     Embodiment 4 
     The present invention is not limited to those shown in the embodiments, but it is needless to say, various designs are modifiable. Examples are mentioned below. 
     (1) As long as using the method to maintain the insertion pieces  3  into the insertion holes, the lens connector  1  may be formed with any method not limiting to the embodiments. For example, the protrusion does not protrude toward the face side but protrude vertically, and holes do not have to be established in the connector body, but engagement sections may be established inside the body ( FIG. 22  (A)). 
     (2) The engagement protrusion  9  placed in the insertion piece  3  is preferably spherical as described above. However, as long as the engagement protrusion  9  can be engaged with the engagement concave portion or the engagement hole placed in the connector body  6  in the fitted state, for example, the engagement protrusion  9  can be a circular truncated cone, and it is not specified to the spherical one. 
     (3)  FIG. 22  shows another embodiment of the lens connector  1 , and an engagement concave portion  78  or engagement hole is established on the insertion hole inner surface  77 , such as both-side surfaces  76  and  76  of the insertion hole  10 , and the engagement protrusion  79  established in the insertion piece  3  is designed to be engaged with the engagement concave portion  78 . Alternatively, concavity and convexity may be reverse. 
     (4) Even with other methods, as long as the construction where the connector body is tightly fitted into the engagement protrusion, any construction is acceptable. 
     (5) In these embodiments, while two fastening pins  32  jotting out from the anchored attachment surface  21  of the connector body  6  are inserted into the fastening holes  29  established in the lens  5 , the retaining protrusion  36  is formed by crushing the protrusion  33 , and this pin may be one, and in that case, it becomes possible to prevent the rotation after connecting with a device to make the shape of the protrusion or the fastening hole rectangular. However, in order to stably secure them, for example, as shown in  FIG. 22B , it is configured such that other fastening pins  32   b  are simply inserted into the fastening holes  29  and a baffling function of the lens connector  1  can be demonstrated. In this case, for the end  93  of the fastening pin  32   b  for baffling, the length should be set not to protrude from the surface of the lens  5 . Furthermore, it is preferable that the other fastening pin  32   a  protrudes with the floor guide-part  16  to enable improving the stability of securing the floor guide-part  16 . 
     (6) The cross-sectional form of the insertion hole  10  can be configured in a variety of forms, including round, hexagonal, rectangular, square and elliptical forms, with the cross-sectional form of the insertion piece  3  being configured to fit such cross-sectional forms of the insertion hole  10 .