PROJECTION DISPLAY DEVICE
First Claim
Patent Images
1. A projection display device, comprising:
- a power supply part which supplies electric power from an external power supply;
a charging part which charges a rechargeable battery with the power supply part;
an alarm part for outputting an alarm sound;
a switching part which supplies either one of the electric power from the power supply part or an electric power from the rechargeable battery to the alarm part; and
a cutoff part which cuts off a supply of the electric power from the rechargeable battery to the alarm part when a charge quantity of the rechargeable battery becomes less than a threshold value.
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Abstract
A projection display device has a power supply unit which supplies electric power from an external power supply, a charging circuit which charges a rechargeable battery with the power supply unit, an alarm part for outputting an alarm sound, and a switching circuit which supplies either the electric power from the power supply unit or an electric power from the rechargeable battery to the alarm part. When a voltage from the rechargeable battery becomes less than a threshold value, the electric power supply from the rechargeable battery to the alarm part is cut off, and power consumption of the rechargeable battery is suppressed.
14 Citations
5 Claims
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1. A projection display device, comprising:
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a power supply part which supplies electric power from an external power supply; a charging part which charges a rechargeable battery with the power supply part; an alarm part for outputting an alarm sound; a switching part which supplies either one of the electric power from the power supply part or an electric power from the rechargeable battery to the alarm part; and a cutoff part which cuts off a supply of the electric power from the rechargeable battery to the alarm part when a charge quantity of the rechargeable battery becomes less than a threshold value. - View Dependent Claims (2, 3, 4, 5)
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Specification