please refer to fig1 to 4 ; the present invention discloses a hand held apparatus which is used for medical treatment application , especially in dental application for curing materials . the hand held apparatus 1 comprises a housing 10 , a heat sink 120 and a replaceable heat - dissipating module 121 . the housing 10 defines a receiving space for containing components of the apparatus , and these components is described hereinafter . the heat sink 120 is installed inside the housing 10 and the replaceable heat - dissipating module 121 contacts tightly with the heat sink 120 . the replaceable heat - dissipating module 121 is used for absorbing heat that is conducted from a light emitting unit 11 through the heat sink 120 . in other words , the heat sink 120 and the replaceable heat - dissipating module 121 are constructed as a heat - dissipating unit 12 with high heat - dissipating efficiency . fig1 and fig2 respectively shows a first and a second embodiments and the difference between the two embodiments are the locking means for combining the heat sink 120 and the replaceable heat - dissipating module 121 . fig1 and 3a show the first embodiment of the present invention . the replaceable heat - dissipating module 121 has a casing 1210 and liquid 1211 contained inside the casing 1210 . the replaceable heat - dissipating module 121 can be drawn out from the heat sink 120 when the liquid 1211 has absorbed heats , and another new replaceable heat - dissipating module 121 can be put into the heat sink 120 for dissipating heat form the light emitting unit 11 . the hand held apparatus 1 provides radiation for curing compound in the embodiment , especially in , but not restricted to dental application . the hand held apparatus 1 is usually used for short period of time . the hand held apparatus 1 has a power supply unit 13 for the light emitting unit 11 and the power supply unit 13 can be batteries or an ac / dc power converter . in other words , the heat - dissipating unit 12 of the present invention is suitable for hand held instrument . please refer to fig1 again ; the housing 10 of the hand held apparatus 1 has a hand held portion 100 and a light transmission unit 101 . the hand held portion 100 has an ergonomic shape for holding and the light transmission unit 101 is substantially a pipe . the hand held portion 100 has an opening 1000 and a side of the light transmission unit 101 connects to the opening 1000 . the other side of the light transmission unit 101 is away from the opening 1000 . moreover , the light transmission unit 101 can be a replaceable element and users can choose suitable light transmission unit 101 as desired by the required situations . the heat sink 120 is installed with the housing 10 and the shape of the heat sink 120 is not restricted . preferably , the replaceable heat - dissipating module 121 contacts closely to the heat sink 120 and a locking means is formed between the replaceable heat - dissipating module 121 and the heat sink 120 . in the embodiment , the replaceable heat - dissipating module 121 is locked on the heat sink 120 so that the wall of the replaceable heat - dissipating module 121 can directly contacts the heat sink 120 for improving the heat - dissipating efficiency . on the other hand , the casing 1210 of the replaceable heat - dissipating module 121 is made of metal materials with high conductivity and the liquid 1211 contained inside the casing 1210 is materials with high thermal capacity , such as water , saline water , or a mixture of water and antifreeze in order to store / absorb more heat . the locking means for connecting the replaceable heat - dissipating module 121 with the heat sink 120 is described in detail . please refer to fig3 a ; the locking means 20 a and 20 b is by screw threads . as to fig3 b , the locking means 20 a and 20 b is the clip mechanism at hand held apparatus out casing . the locking means has various types and the locking means is used for connecting the replaceable heat - dissipating module 121 with the heat sink 120 . the hand held apparatus 1 has a light emitting unit 11 for projecting radiation to cure the curable compound . the light emitting unit 11 is installed on the heat sink 120 , for example on the outer surface of side wall 1200 of the heat sink 120 . the position of the light emitting unit 11 is corresponding to the opening 1000 of the hand held portion 100 . the light emitting unit 11 can be a light emitting element , such as a solid state light emitting die or a heat and light generating element . furthermore , the hand held apparatus 1 has a power supply unit 13 which electrically connects to the light emitting unit 11 to supply the power for operation of the hand held apparatus 1 . the position of the replaceable heat - dissipating module 121 can be adjusted for adapting the hand held apparatus 1 to any application . for example , the replaceable heat - dissipating module 121 can be closed to the light emitting unit 11 for dissipating heat more efficiently . in usage , the light emitting unit 11 is powered by the power supply of the power supply unit 13 to emit curing light and the light is transmitted to a predetermined curable materials though the light transmission unit 101 . simultaneously , the byproduct of heat is conducted to the replaceable heat - dissipating module 121 though the heat sink 120 and is absorbed within the liquid 1211 . after the curable material is cured , the light emitting unit 11 is powered - off . the replaceable heat - dissipating module 121 with stored heat can be drawn out and another replaceable heat - dissipating module 121 for absorbing heat can be connected with the heat sink 120 via locking means . the replaceable heat - dissipating module 121 with stored heat can be placed under normal air condition for dissipating heat form the liquid 1211 to air . alternatively , the replaceable heat - dissipating module 121 with stored heat can be placed into a refrigerator to dissipate faster the heat stored in the liquid 1211 . moreover , the housing 10 can have at least one venting hole thereon or not , under the condition that the electronic device inside the housing 10 can operate normally . fig4 shows a fourth embodiment of the present invention . the difference between this embodiment and the first and second embodiments is that the light emitting unit 11 is a reflective radiation source . the light emitting unit 11 ′ has a light emitting element 11 a and a light reflection element 11 b . the light emitting element 11 a can be a solid state light emitting die and the light reflection element 11 b comprises at least one mirror with optical reflective property or the light reflection element 11 b is a reflective plane with a cup shape . the light reflection element 11 b is used for reflecting the radiation from the light emitting element 11 a to the curable materials . in the embodiment , the heat sink 120 ′ has a tubular portion and the light emitting element 11 a is installed on the end of the tubular portion . therefore , the light transmission unit 101 is omitted in this embodiment . on the other hand , the replaceable heat - dissipating module 121 is attached or locked on the heat sink 120 ′. thus , the hand held apparatus 1 also performs with high dissipating efficiency . 1 . the present invention provides for an improved heat - dissipating efficiency . the heat is conducted away from the light emitting unit via a solid path , i . e ., the heat sink and the casing of the replaceable heat - dissipating module , and the conducted heat is stored within the liquid of high thermal capacity . therefore the byproduct of heat is dissipated from the light emitting unit so that the performance of the light emitting unit is not affected by the thermal increase . 2 . moreover , it is convenient for easily replacing the replaceable heat - dissipating module . the user can replace the replaceable heat - dissipating module while the hand held apparatus is in non - operating period . in other words , when the hand held apparatus is powered off , the replaceable heat - dissipating nodule with stored heat is replaced by a new one . therefore , the heat is dissipated and stored within the liquid of the replaceable heat - dissipating module and the new replacement will not interrupt the curing process since it is faster to exchange the replaceable heat - dissipating module as suppose to wait for heat to dissipate on its own . 3 . the replaceable heat - dissipating module is used for dissipating heat and the fans of prior art are omitted in the present invention . therefore , the problems of fans , such as noise of fan operation and electric power consuming are solved . even though the present invention has been described with reference to the foregoing preferred embodiment , it shall be understood that the present invention is not limited to the details thereof . various equivalent variations and modifications may occur to those skilled in this art in view of the teachings of the present invention . thus , all such variations and equivalent modifications are also embraced within the scope of the present invention as defined in the appended claims .
a hand held apparatus for curing materials with radiation of predetermined wavelength is disclosed . the apparatus includes a housing , a heat sink installed in the housing , a light emitting unit installed on the heat sink , the light emitting unit includes at least one light emitting element , a replaceable heat - dissipating module contacting the heat sink , and a light transmission unit coupled to the housing . the replaceable heat - dissipating module contains liquid for absorbing heat generated from the light emitting unit . the light transmission u nit is used for transmitting the radiation of the light emitting element to the materials . whereby , the heat dissipation efficiency can be improved .