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US 6,686,704 B2Granted
Lamp lighting apparatus and projector using the same
AssigneeSony Corporation
InventorToshio Suzuki
Life of this patent
Estimating the term…
Abstract
A lamp lighting apparatus including a voltage control section for supplying a pulse voltage whose peak value rises stepwise, and a power conversion section for converting an output of the voltage control section into a high voltage and applying the high voltage to a lamp to light the lamp and for supplying, after the lamp is lit once, a self-sustaining discharge current to the lamp.
Claims12
A lamp lighting apparatus comprising:
- voltage controlling means for supplying a voltage having a peak value that rises stepwise;
- and
- power conversion means for converting an output of said voltage controlling means into a high voltage and applying the high voltage to a lamp to light the lamp and for supplying to the lamp, after the lamp is in a lit state, an AC current to maintain a discharge of the lamp.
A lamp lighting apparatus comprising:
- power conversion means including a transformer having a primary winding and a secondary winding for outputting, when a predetermined voltage is applied to said primary winding, a high voltage obtained at said secondary winding to light a lamp and for supplying to the lamp, after the lamp is lit, an AC current to maintain the lamp in a discharging state from said secondary winding;
- voltage controlling means for outputting a pulse voltage having a driving time that increases stepwise;
- and
- switching means controlled in an on state with an output of said voltage controlling means for applying the predetermined voltage to said primary winding to excite said primary winding.
1 more element
A lamp lighting apparatus comprising:
- power conversion means including a transformer having a primary winding and a secondary winding for outputting, when a charging voltage is applied to said primary winding, a high voltage obtained on said secondary winding to light a lamp and for supplying to the lamp, after the lamp is lit, an AC current to maintain the lamp in a discharging state from said secondary winding;
- voltage controlling means including a charging circuit for supplying the charging voltage, a voltage dividing circuit for dividing an output of said charging circuit, and a circuit for lowering a dividing ratio of said voltage dividing circuit in a stepwise fashion;
- and
- switching means controlled to be in an on state with an output of said voltage controlling means for applying the charging voltage to said primary winding to excite said primary winding.
1 more element
A projector comprising:
- voltage controlling means for supplying a voltage having a peak value that rises stepwise;
- power conversion means for converting an output of said voltage controlling means into a high voltage and applying the high voltage to a lamp to light the lamp and for supplying to the lamp, after the lamp is in a lit state, an AC current to maintain a discharge of the lamp to maintain the lamp in the lit state;
- a display panel for one of transmitting light therethrough and reflecting light emitted from the lamp lit by said power conversion means;
- and
- an optical system for projecting light output from said display panel.
2 more elements
A projector comprising:
- power conversion means including a transformer having a primary winding and a secondary winding for outputting, when a predetermined voltage is applied to said primary winding, a high voltage obtained at said secondary winding to light a lamp and for supplying to the lamp, after the lamp is in a lit state, an AC current to maintain the lamp in a discharging state to the lamp from said secondary winding;
- voltage controlling means for outputting a pulse voltage having a driving time that increases stepwise;
- switching means controlled into an on state with an output of said voltage controlling means for applying the predetermined voltage to said primary winding to excite said primary winding;
- a display panel for one of transmitting light therethrough and reflecting light emitted from the lamp lit by said power conversion means;
- and
- an optical system for projecting light output from said display panel.
3 more elements
A projector comprising:
- power conversion means including a transformer having a primary winding and a secondary winding for outputting, when a charging voltage is applied to said primary winding, a high voltage obtained at said secondary winding to light a lamp and for supplying to the lamp, after the lamp is in a lit state, an AC current to maintain the lamp in a discharging state from said secondary winding;
- voltage controlling means including a charging circuit for supplying the charging voltage, a voltage dividing circuit for dividing an output of said charging circuit and a circuit for lowering a dividing ratio of said voltage dividing circuit in a stepwise fashion;
- switching means controlled to be an on state with an output of said voltage controlling means for applying the charging voltage to said primary winding to excite said primary winding;
- a display panel for one of transmitting light therethrough and reflecting light emitted from the lamp lit by said power conversion means;
- and
- an optical system for projecting light output by said display panel.
3 more elements
Dependencies are inferred from the claim text.