the above and other objects , features and advantages of the present invention will become apparent from the following detailed description taken with the accompanying drawings . referring to fig1 for an exploded view of a preferred embodiment of the present invention , a safety goggles structure 1 of the invention comprises a frame 2 , a lens 3 and two elastic buckles 4 . with reference to fig1 and 2 , fig2 shows a perspective view of a frame in accordance with a preferred embodiment of the invention from another viewpoint , the frame 2 is substantially in a ring - shape and has an opening 21 around the frame 2 , and the frame 2 includes a frame connecting portion 22 , a frame latch portion 23 , two frame snap - in portions 24 , at least one upper guide channel 251 , at least one lower guide channel 252 and an upper gutter 26 . the frame connecting portion 22 is disposed at the top of the frame 2 , and the frame latch portion 23 is disposed at the bottom of the frame 2 , and two frame snap - in portions 24 are disposed on both lateral sides of the frame 2 respectively , and the upper guide channel 251 is upwardly tapered and slantingly and concavely disposed at the top of the front side of the frame 2 and interconnected with the opening 21 and the exterior of the frame 2 , and the lower guide channel 252 is upwardly tapered and concavely disposed at the bottom of the front side of the frame 2 and interconnected to the opening 21 and the exterior of the frame 2 , and the upper gutter 26 is disposed at the upper side of the frame 2 , and each frame snap - in portion 24 includes a stop portion 241 . in this embodiment , the frame connecting portion 22 is a baffle 221 , and the baffle 221 has an external baffle periphery 2211 , and the frame latch portion 23 has a latch protrusion 231 , and two stop portions 241 are l - shaped embedding hooks disposed on both lateral sides of the frame 2 respectively , and the frame 2 is divided into a front portion 28 and a rear portion 29 , and the front portion 28 of the frame 2 is made of a hard material , and the rear portion 29 of the frame 2 is made of a soft material , and the rear portion 29 of the frame 2 is attached to the front portion 28 of the frame 2 after a secondary processing , and the soft material made rear portion 29 of the frame 2 provides a comfortable wearing of the safety goggles structure 1 . with reference to fig1 and 3 , fig3 shows a perspective view of a lens in accordance with a preferred embodiment of the invention from another viewing angle , the lens 3 comprises a lens connecting portion 32 , a lens latch portion 33 and two lens snap - in portions 34 . the lens connecting portion 32 is disposed at the top of the lens 3 , and the lens latch portion 33 is disposed at the bottom of the lens 3 , and the two lens snap - in portions 34 are disposed on both lateral sides of the lens 3 , and each lens snap - in portion 34 includes a snap - in hole 341 and an embedding edge 342 . in this preferred embodiment , the lens connecting portion 32 is a notch 321 having an internal notch rim 3211 and a flange 3212 disposed at the bottom of the notch 321 , and the lens latch portion 33 includes a latch groove 331 , and the latch protrusion 231 and the latch groove 331 are in a backwardly tapered shape . with reference to fig4 and 5 , fig4 shows a perspective view of an elastic buckle in accordance with a preferred embodiment of the present invention and fig5 shows a perspective view of an elastic buckle in accordance with a preferred embodiment of the present invention from another viewing angle . each of the two elastic buckles 4 has a top pressing edge 41 , at least one connecting hole 42 , a wedge - shaped connector 43 and at least one wedge - shaped protrusion 44 , and the wedge - shaped connector 43 can be elastically rotated along with the elastic buckle 4 . with reference to fig1 to 5 as well as fig6 to 10 , fig6 shows a perspective view of a preferred embodiment of the present invention , and fig7 shows a cross - sectional view of section a - a of fig6 , and fig8 shows a bottom view of a portion of fig6 , and fig9 shows a cross - sectional view of section b - b of fig6 , and fig1 shows a cross - sectional view of section c - c of fig6 . when the lens 3 and the frame 2 are assembled , the lens 3 is covered onto the opening 21 and the periphery of the lens 3 is covered onto the upper guide channel 251 and the lower guide channel 252 , and the lens connecting portion 32 of the lens 3 is latched to the frame connecting portion 22 of the frame 2 , and the lens latch portion 33 of the lens 3 is latched to the frame latch portion 23 of the frame 2 , and the two lens snap - in portions 34 of the lens 3 are snapped into the two frame snap - in portions 24 of the frame 2 . in other words , the baffle 221 of the frame connecting portion 22 is latched into the notch 321 of the lens connecting portion 32 , such that the external baffle rim 2211 is attached onto the internal notch rim 3211 , and the baffle 221 stops the flange 3212 , and the latch groove 331 of the lens latch portion 33 is latched with the latch protrusion 231 of the frame latch portion 23 , and the two l - shaped embedding hooks of the frame 2 are embedded with the two embedding edges 342 of the lens 3 respectively . when the lens 3 and the frame 2 are assembled , the lens 3 is tilted slightly such that the baffle 221 of the frame connecting portion 22 is latched to the notch 321 of the lens connecting portion 32 , such that the external baffle rim 2211 is attached with the internal notch rim 3211 , and the baffle 221 stops the flange 3212 . if it is necessary to move the lens 3 forward , the forward movement of the lens 3 will be limited , since the baffle 221 stops the flange 3212 . if it is necessary to move the lens 3 backward or downward , the backward and downward movements of the lens 3 will be limited , since the lens 3 is covered onto the periphery of the frame 2 . if it is necessary to move the lens 3 to the left or the right , the external baffle rim 2211 will limit the left and right movements of the internal notch rim 3211 , since the baffle 221 is latched with the notch 321 . therefore , the left and right movements of the lens 3 are limited . if it is necessary to move the lens 3 upward , the external baffle rim 2211 will limit the upward movement of the bottom of the notch 321 , since the baffle 221 is latched with the notch 321 . therefore , the upward movement of the lens 3 will be limited . in summation , the movements of the lens 3 in six directions are all limited , and thus the lens 3 is mounted onto the frame 2 . the bottom of the lens 3 is pushed gently to latch the latch groove 331 of the lens latch portion 33 with the latch protrusion 231 of the frame latch portion 23 of the frame 2 . since the latch protrusion 231 and the latch groove 331 come with a backwardly tapered design ( as shown in fig8 ), the forward movement of the bottom of the lens 3 is limited , therefore the lens 3 can be mounted onto the frame 2 . after the lens 3 is mounted onto the frame 2 , each elastic buckle 4 is inserted and snapped into each snap - in hole 341 of the lens 3 , and each top pressing edge 41 abuts each stop portion 241 of the frame 2 , and the rear edge of each wedge - shaped connector 43 abuts the rear edge of each snap - in hole 341 . in the foregoing process , the wedge - shaped connector 43 of the elastic buckle 4 is elastic , such that when the wedge - shaped connector 43 of the elastic buckle 4 is inserted into the snap - in hole 341 , the wedge - shaped connector 43 can be turned elastically and slightly first and then inserted into the snap - in hole 341 . after the wedge - shaped connector 43 is inserted into the snap - in hole 341 , the elastic wedge - shaped connector 43 resumes its original position to latch the snap - in hole 341 . further , the rear edge of the wedge - shaped connector 43 of the elastic buckle 4 abuts the rear edge of the snap - in hole 341 of the lens 3 , and the top pressing edge 41 of the elastic buckle 4 abuts the stop portion 241 of the frame 2 , such that the lens 3 can be securely mounted onto the frame 2 by the foregoing connecting and latching methods . with reference to fig1 to 10 as well as fig1 , fig1 shows a schematic view of an application mode of a safety goggles structure in accordance with a preferred embodiment of the invention , the safety goggles structure 1 , the frame 2 further comprises a circular flexible edge 27 disposed around the rear side of the frame 2 , and the two elastic buckles 4 have two connecting holes 42 for separately connecting to both ends of a headband 5 . when the safety goggles structure is used , the headband 5 is provided for a user &# 39 ; s head ( not shown in the figure ) to wear the safety goggles . with the circular flexible edge 27 , the frame 2 is in contact with a worker &# 39 ; s head tightly and comfortably . in addition , the two elastic buckles 4 have at least one wedge - shaped protrusion 44 separately for stopping the headband 5 from sliding . in fig1 , the wedge - shaped protrusions 44 are disposed on the external side of the elastic buckle 4 . of course , the wedge - shaped protrusions 44 can be designed to be disposed on the internal side of the elastic buckle 4 as well . in summation , the design of various latching structures in accordance with the present invention provides a secured connection of the frame 2 and the lens 3 of the safety goggles structure 1 , such that the frame 2 or the lens 3 will not separate from each other when a user wears or removes a goggle , or removes the elastic buckle 4 for cleaning or maintenance , so that the frame 2 or the lens 3 will not be damaged by falling down onto the ground . with the upwardly tapered upper guide channel 251 slantingly and concavely disposed at the top of the front side of the frame 2 and the upwardly tapered lower guide channel 252 disposed at the bottom of the front side of the frame 2 , air enters from the bottom and discharges from the top to achieve the purpose of circulating air when a user wears the safety goggles structure 1 . in other words , the lens 3 will not produce fogs . with the foregoing slanting design , foreign substances such as dusts , pebbles and liquid splashes will not enter into the safety goggles or damage the eyes of a worker . in addition , the upper guide channel 251 and the lower guide channel 252 come with an upwardly tapered design . based on the conservation of mass , when air flows from a large cross - sectional area to a small cross - sectional area , the speed of airflow becomes larger , such that a jet flow is formed when the air enters into the lens 3 first and then discharges from the lens 3 , so as to improve the anti - fog efficiency in the lens 3 as well as the heat dissipating efficiency in the lens 3 . with the upwardly tapered design of the upper guide channel 251 and the design of the upper gutter 26 , liquid splashed onto the safety goggles will not enter into the safety goggles easily , since the upwardly tapered upper guide channel 251 provides a small outlet for discharging the airflow . the liquid splashes will flow down along both lateral sides of the upper gutter 26 without causing the issue of accumulating liquid . if liquid overflows from the upper guide channel 251 into the safety goggles , the liquid will flow down along the slanting and concaved upper guide channel 251 and the internal surface of the lens 3 to the lower guide channel 252 vertically up - and - down and concavely disposed at the bottom so as to effectively avoid liquid from contacting a wearer &# 39 ; s eyes . in summation of the description above , the present invention improves the connecting stability and prevents fogs , liquid accumulations and leaks by an improved structural design , and complies with the patent application requirements , and thus is duly filed for patent application . while the invention has been described by means of specific embodiments , numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of the invention set forth in the claims .