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Rechargeable light curing apparatus

  • US 5,471,129 A
  • Filed: 04/02/1993
  • Issued: 11/28/1995
  • Est. Priority Date: 04/03/1992
  • Status: Expired due to Term
First Claim
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1. A rechargeable light curing apparatus in combination with a recharging unit, wherein said rechargeable light curing apparatus comprises:

  • at least one hand-operated device with a handle and an on/off switch comprising;

    a) a battery pack with at least one accumulator;

    b) an electrical contact for recharging said battery pack;

    c) a lamp, connected to said battery pack, for emitting light at a defined light emission state when switched on by said on/off switch;

    d) light conducting elements positioned in the vicinity of said lamp for receiving and conducting the emitted light;

    e) a capacity measuring circuit connected between said battery pack and said lamp for determining a remaining operating period of said battery pack remaining before a recharging of said battery pack is required; and

    whereinsaid recharging unit is detachably connected to said hand-operated device, wherein, when said hand-operated device is inserted into said recharging unit, a quick recharging mode is switched on, said recharging unit comprising a control unit for switching from said quick recharging mode to a charge maintaining mode, wherein in said quick recharging mode a pulsed recharging current is used having a characteristic curve adapted to the charge level of said battery pack, and wherein intervals between two pulses of said pulsed recharging current, a terminal voltage, corresponding to the charging level of said battery pack, to be measured during a respective interval is prepared.

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