the invention is illustrated through a description of a preferred embodiment in which the device is designed around a cylindrical protective shield . please refer to fig1 first . this figure shows the top view of this ultraviolet disinfection device 100 . in this embodiment of the invention , there are four disinfection cells 35 and therefore four openings on the top cover of the device . please then refer to fig2 and fig3 . fig2 is an exploded view of the preferred embodiment of the ultraviolet disinfection device that is shown in fig1 . fig3 is a sectional view along the axis 3 - 3 of fig1 . the device has a base 1 at the bottom of the ultraviolet disinfection device 100 . at the bottom of base 1 is a base bottom cover 16 . above the base bottom cover 16 is a circuit board 15 . there is a micro - switch 18 inside the base 1 ( as shown in fig6 ). the micro - switch 18 is connected to the circuit board 15 . above the circuit board 15 is a base body 10 . the top surface of the base body 10 is raised to form a platform 14 . on the platform 14 there are two sets of supporting poles 13 a and 13 b . on top of each supporting pole 13 a there is a supporting pole extension 17 . each supporting pole 13 b has a triggering hook holding slot on the outer side of the top of supporting pole 13 b . on the rim of the platform 14 there are several base connection holes 12 to connect to the base ring 54 that is placed inside of platform 14 . in one corner of base body 10 there is a pushbutton switch 1 i 1 that is connected to the circuit board 15 that is placed inside base 1 . a mechanical triggering device 6 is placed inside one of the supporting poles 13 b . this mechanical triggering device 6 consists of a pivot supporting frame 60 and a trigger plank 61 . the pivot supporting frame 60 is placed inside one of the supporting poles 13 b . at the central part near the top edge of each of the two sides of the top portion of the pivot supporting frame 60 that are facing each other , there is a pivot hole 62 . the two pivot holes 62 respectively on the said two opposite sides are in line . the two trigger plank pivot shafts 63 that protrude from the central part of the two narrower sides of the trigger plank 61 is respectively engaged into the two pivot holes 62 . thus , the trigger plank 61 can turn about the axis of the pivot . a device body 5 is installed on top of base body 10 . this device body 5 includes a base ring 54 that is at the bottom of device body 5 and a center shell 50 that is on top of base ring 54 . base ring 54 is made of a material that is preferably translucent to visible light but opaque to uv light . the footprint of center shell 50 and base ring 54 matches the shape of the round platform 14 that is on top of base body 10 . thus after they are attached together and aligned , base 1 and device body 5 can be connected together by inserting screw bolts through the base ring connection hole 56 inside the base ring fixing block 55 on the rim of the base ring 54 , and through the base connection hole 12 on the platform 14 . furthermore , the preferred embodiment includes several cover lockers 52 intruding inside , as well as several slightly bulging reflection cup supporters 51 on the inner surface of the centre body 50 near the top . in the middle of each cover locker 52 there is a cover locking slot 53 . reflection cup supporter 51 is used to hold reflection cup 3 to mount it inside device body 5 . cover locking slot 53 is an irregular slot . one end of the slot is wider than the other . thus the locking hook 24 beneath the top cover 2 can be placed inside it to lock the top cover 2 on top of the device body 5 . the reflection cup 3 is installed inside device body 5 . the reflection cup unit 30 has two connected portions : reflection cup ring 31 and reflection cup body 32 . reflection cup ring 31 is a cylinder with two indentations on its surface at the opposite ends of a diameter of the reflection cup 31 . the two indentations form two reflection cup notches 33 , which engage with the two intruding cover lockers 52 on the top portion of the center body 50 . on the bottom of the reflection cup body 32 there is a cross - shaped , in this embodiment , hole which is the supporting pole passage hole 36 ( as shown in fig3 ). when the reflection cup 3 is installed into the device body 5 , the supporting poles 13 a and 13 b pass through the supporting pole passage hole 36 to fit into the supporting pole holding cavities 34 inside the reflection cup body 32 . the space between these supporting pole holding cavities 34 are disinfection cells 35 . the objects to be disinfected will be placed here for disinfection . in a preferred embodiment , an ultraviolet protective shield 4 comprises ( a ) a shield body 40 , in this embodiment it is cylindrical , with four fixing arms 42 a and 42 b protruding horizontally from the top region of the outer surface of the cylindrical body to form a cross shape as view from above , ( b ) a stack of horizontal , ring - shaped , preferably thin , circular slats 41 strategically deployed at non - uniform vertical spacing below the lower circular rim of the shield body 40 and ( c ) a number of vertical links , preferably thin , protruding downwards from the bottom circular rim of the shield body 40 . the various levels of horizontal circular slats 41 are linked together and kept at strategic vertical spacing by the said vertical links . the four fixing arms 42 a and 42 b of the protective shield 4 are mounted on top of the four supporting poles 13 a and 13 b , respectively , with the supporting pole extensions 17 priorly glued on top of the supporting poles 13 a , as extended parts of supporting poles 13 a . the ultraviolet lamp 47 has its two adjacent electrodes located at one end . each electrode has a connecting wire . lamp holder 48 embraces the top part of the ultraviolet lamp and its two electrodes . the lamp holder 48 , together with the ultraviolet lamp 47 , is inserted and fitted into the hollow center of the shield body 40 of the ultraviolet protective shield 4 , with the whole length of the ultraviolet lamp 47 being surrounded by the stack of slats 41 of the ultraviolet protective shield 4 . the two connecting wires of the ultraviolet lamp 47 are threaded through the central cavity of one of the supporting pole 13 b to reach the circuit board 15 from where suitably conditioned electrical power for the ultraviolet lamp is obtained during disinfection periods . since the electronics of the uv lamp driver is well - known in the trade , it is not described here . a protective shield cover 45 completely covers the top parts of ultraviolet protective shield 4 including its four fixing arms 42 a and 42 b . on two opposite arms of the protective shield cover 45 there are body connection holes 46 , which align with the two body connection holes 43 on the fixing arms 42 a , through which two fixing screws are applied . top cover 2 is placed above the reflection cup 3 and on top of the center shell 50 . there are several disinfection cell holes 21 on the cover body 20 , which allow passage tubes 23 to extend into disinfection cells 35 , leading objects to be disinfected into the disinfection cells 35 . close to the rim on the bottom side of the top cover 2 there are two downward extensions whose lower parts are the locking hooks 24 , which lock respectively into the cover locking slots 53 . the locking hooks 24 first enter the wider end of the cover locking slots 53 . when top cover 2 is turned in the clockwise direction , the locking hooks 24 move towards the narrower ends of the cover locking slots 53 . thus the hooks on the bottom of locking hooks 24 press against the inner ceiling near the cover locking slots 53 , locking the top cover 2 and the device body 5 together . additionally , on the bottom side of the top cover 2 near two of the disinfection cell holes 21 , there are two downward extensions whose lower parts are the triggering hooks 22 . after the top cover 2 and the center body 50 are locked together , the hooks at the bottom of the two triggering hooks 22 are respectively inserted into the triggering hook accepting slots at the top part of the two supporting poles 13 b and the fixing arms 42 b . please then refer to fig4 and fig5 . fig4 illustrates how the ultraviolet protective shield 4 of the ultraviolet disinfection device 100 prevents the ultraviolet light generated by the ultraviolet lamp 47 from leaking directly out of the device . fig5 is a sectional elevation view of the ultraviolet protective shield 4 . the ultraviolet protective shield 4 is made of a tough and strong material that is opaque to ultraviolet light and may be transparent , translucent or opaque to visible light . the stack of ring - shaped circular slats 41 of the ultraviolet protective shield 4 surrounds the ultraviolet lamp 47 . the vertical thickness of the ring - shaped circular slats 41 is preferably as small as possible to minimize blockage of the ultraviolet light rays that shine into the disinfection cells 35 , but thick enough to provide the required mechanical strength . to determine the appropriate thickness , factors such as the strength of the material , the fabrication method , the actual size of the shield and the overall cost allowed have to be considered . this embodiment employs injection molding of polycarbonate ( pc ) resin with stabilizer against uv added . for an outer diameter of 20 mm for the slats 41 , it is found that the optimal vertical thickness of the slats 41 is slightly less than 1 mm around the inner circumference of the circular slats and progressively reduced to about 0 . 5 mm around the outer circumference . the various levels of horizontal slats 41 are linked together and kept at strategic vertical spacing by the said thin vertical links . the horizontal slats 41 are said to be strategically spaced because the spacing density is not uniform for all the various levels : densest at the top level and progressively less dense for the lower levels ( see fig3 ). the specific horizontal width of each slat 41 in the stack and the specific vertical spacing of that slat from its neighbors are carefully selected so that all the slats in the stack together form a complete blockage against the ultraviolet light rays generated by the ultraviolet lamp 47 in all possible direct paths leading to the user &# 39 ; s eyes through the disinfection cell holes 21 of the top cover 2 , while the number of slats 41 in the stack is minimized so that the blockage effect is very little for the light rays that enter the disinfection cells 35 . the vertical spacing of the different levels of the slats is not uniform because for any fixed point of view above any of the disinfection cell holes 21 , the angle of view for a point at the ultraviolet lamp 47 varies with the vertical position of that point . by simple trigonometry , the optimal spacing of the different levels of the slats so , as to form a good - enough complete shield against the direct leakage of ultraviolet light rays can be worked out . as shown in fig4 , the slats prevent the ultraviolet light 7 generated by the ultraviolet lamp 47 from leaking through the disinfection cell holes 21 into the user &# 39 ; s eyes . at the same time , most of the ultraviolet light is allowed to pass through the space between the slats 41 to reach the disinfection cells 35 and shine onto the major parts of the objects to be disinfected if the latter are inserted into the disinfection cells 35 . please refer to fig6 which is a perspective sectional view along the axis 6 - 6 of fig1 . in fig6 , a supporting pole 13 b is sectioned to show its interior where the mechanical triggering device 6 is accommodated . as already described in a previous paragraph , the mechanical triggering device 6 consists of the pivot supporting frame 60 and the trigger plank 61 . the pivot supporting frame 60 keeps the trigger plank 61 in the proper position and provides a pivot axis for the trigger plank 61 to turn about . after the top cover 2 is placed correctly to cover the device body 5 , turning the top cover 2 in the clockwise direction will lock the top cover 2 and the device body 5 together . the two triggering hooks 22 will also be inserted respectively into the triggering hook accepting slots at the top part of supporting poles 13 b and fixing arms 42 b . as shown in fig7 , triggering hook 22 pushes the top part 64 of the trigger plank 61 to the left . thus the bottom part 65 of trigger plank 61 moves to the right because of the leverage action . when it presses the micro - switch 18 inside the base 1 , the circuit in the circuit board 15 is turned on , and the automatic disinfection program starts to cycle . finally , please refer to fig8 and fig9 . they illustrate respectively the strength of the ultraviolet light that leaks from this ultraviolet disinfection device 100 right outside the disinfection cell holes 21 before and after installation of the ultraviolet protective shield 4 . in fig8 , where the ultraviolet disinfection device 100 is without the ultraviolet protective shield 4 , the ultraviolet strength readings right outside the disinfection cell holes 21 average to 160 μwcm − 2 . but when the ultraviolet disinfection - device 100 is with the ultraviolet protective shield 4 installed inside , the ultraviolet strength readings right outside the disinfection cell holes 21 , as shown in fig9 , average to 20 μwcm − 2 . this demonstrates that the ultraviolet protective shield 4 can substantially reduce the leakage of the ultraviolet light from the ultraviolet disinfection device 100 . based on the abovementioned structure , ultraviolet disinfection device 100 utilizes a simple design to automatically disinfect long objects such as toothbrushes and chopsticks by simply inserting the objects into the disinfection cells 35 of this device 100 . it is very easy to disinfect personal belongings . by utilizing the ultraviolet protective shield 4 around the ultraviolet lamp 47 with a shield body 40 , this design both provides sufficient disinfection power and reduces substantially the leakage of ultraviolet light that may otherwise hurt the user &# 39 ; s eyes . this ultraviolet disinfection device 100 is both convenient and safe to use , and is also good for the user &# 39 ; s health .
the invention relates to a uv - lamp sterilizing appliance that is used to destroy bacteria . the appliance presents a simple design which can facilitate the sterilization of any elongate personal article such as toothbrush , chopsticks and the like for sanitation by simply putting them into the appliance . the appliance also includes a protective shield surrounding the uv - lamp . the shield is designed to prevent any damage to the user &# 39 ; s sight from the leakage of the uv - lamp radiation and also to retain the capacity to destroy bacteria sufficiently . the shield also protects the lamp from damage . thereby the appliance according to the invention can be used easily and safeguards the user &# 39 ; s health .