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US 5,394,063 AGranted
Video light apparatus
AssigneeSony Corporation
InventorRyoji Nakazawa
Life of this patent
Estimating the term…
Abstract
A reed switch is provided between a video camera and a battery pack circuit section. A current flowing when the video camera operates is detected by the reed switch. A video light is turned on or off on the basis of the detected current value. When the power source does not reach a specified voltage, the video light is turned off. The outer light amount when photographing is converted into an electric current by a phototransistor. When the current is less than a threshold level, the video light is lit or turned on. The threshold level is varied by a variable resistor.
Claims22
A video light apparatus comprising:
- a light for lighting an object to be photographed by a video camera, said light being supplied with electric power from a battery which supplies electric power to the video camera;
- a current detecting circuit for detecting a current consumption state of the video camera, the supply of the electric power to said light being controlled on the basis of an output signal of said current detecting circuit;
- and
- an outer light amount detecting circuit including a variable threshold level circuit for establishing a variable threshold level and for detecting an outer light amount at the time of photographing by the video camera, said electric power to said light being controlled so as to be provided when said outer light amount is less than said variable threshold level.
1 more element
A video light apparatus comprising:
- a light for lighting an object to be photographed by a video camera, said light being supplied with electric power from a battery which supplies electric power to the video camera;
- and
- an outer light amount detecting circuit for detecting an outer light amount at the time of photographing by the video camera, said outer light amount detecting circuit including a variable threshold level circuit for establishing a variable threshold level and for detecting an outer light amount, said electric power to said light being controlled so that said power is provided depending on a relative value of said light to said variable threshold level.
A video light apparatus comprising:
- a light for lighting an object to be photographed by a video camera, said light being supplied with electric power from a battery which supplies electric power to the video camera;
- a current detecting circuit for detecting a current consumption state of the video camera;
- and
- an outer light amount detecting circuit, including a threshold level circuit for establishing a variable threshold level for said light amount, for detecting an outer light amount at the time of photographing by the video camera;
- the supply of the electric power to said light being controlled on the basis of output signals of said current detecting circuit and said outer light amount detecting circuit, whereupon said electric power is not provided to said light when said outer light is greater than said variable threshold level.
2 more elements
A video light apparatus comprising:
- a light for lighting an object to be photographed by a video camera, said light being supplied with electric power from a battery which supplies electric power to the video camera;
- a voltage detecting circuit for detecting a power source voltage of the battery;
- a current detecting circuit for detecting a current consumption state of the video camera;
- and
- an outer light amount detecting circuit, including a threshold level circuit for establishing a variable threshold level for detecting light amount, for detecting an outer light amount at the time of photographing by the video camera;
- the supply of the electric power to said light being controlled on the basis of output signals of said voltage detecting circuit, said current detecting circuit, and said outer light amount detecting circuit.
3 more elements
A video light apparatus comprising:
- a light for lighting an object to be photographed by a video camera, said light being mounted between the video camera and a battery which is detachably mounted on the video camera and which supplies electric power to the video camera and said light being supplied with electric power from the battery;
- a current detecting circuit for detecting a current consumption state of the video camera, the supply of the electric power to said light being controlled on the basis of an output signal of said current detecting circuit;
- and
- an outer light amount detecting circuit including a variable threshold level circuit for establishing a variable threshold level and for detecting an outer light amount for producing a signal which stops said supply of electric power to said light when said outer light amount is greater than said variable threshold level for said outer light.
1 more element
A video light apparatus comprising:
- a light for lighting an object to be photographed by a video camera, said light being mounted between the video camera and a battery which is detachably mounted on the video camera and which supplies electric power to the video camera and said light being supplied with electric power from the battery;
- and
- an outer light amount detecting circuit, including a threshold level circuit for establishing a variable threshold level, for detecting an outer light amount at the time of photographing by the video camera;
- the supply of the electric power to said light being controlled on the basis of an output signal of said outer light amount detecting circuit, whereupon said supply of electric power is inhibited when said outer light amount is greater than said variable threshold level for said outer light as determined by said threshold level circuit.
1 more element
A video light apparatus comprising:
- a light for lighting an object to be photographed by a video camera, said light being mounted between the video camera and a battery which is detachably mounted on the video camera and which supplies electric power to the video camera and said light being supplied with electric power from the battery;
- a current detecting circuit for detecting a current consumption state of the video camera;
- and
- an outer light amount detecting circuit, including a variable threshold level circuit for establishing a variable threshold level, for detecting an outer light amount at the time of photographing by the video camera;
- the supply of the electric power to said light being controlled on the basis of output signals of said current detecting circuit and said outer light amount detecting circuit, wherein said supply of electric power is inhibited when said outer light is greater than said variable threshold level for said outer light as determined by said variable threshold level circuit.
2 more elements
A video light apparatus comprising:
- a light for lighting an object to be photographed by a video camera, said light being mounted between the video camera and a battery which is detachably mounted on the video camera and which supplies electric power to the video camera and said light being supplied with electric power from the battery;
- a voltage detecting circuit for detecting a power source voltage of the battery;
- a current detecting circuit for detecting a current consumption state of the video camera;
- and
- an outer light amount detecting circuit, including a variable threshold level circuit for establishing a variable threshold level, for detecting an outer light amount at the time of photographing by the video camera;
- the supply of the electric power to said light being controlled on the basis of output signals of said voltage detecting circuit, said current detecting circuit, and said outer light amount detecting circuit.
3 more elements
A video light apparatus comprising:
- a light for lighting an object to be photographed by a video camera, said light being mounted between the video camera and a battery which is detachably mounted on the video camera and which supplies electric power to the video camera and said light being supplied with electric power from the battery;
- a current detecting circuit for detecting a current consumption state of the video camera, the supply of the electric power to said light being controlled on the basis of an output signal of said current detecting circuit;
- an outer light amount detecting circuit including a variable threshold level circuit for detecting an outer light amount for producing a signal which stops said supply of electric power to said light when said outer light amount is greater than a threshold level for said outer light, wherein said outer light amount detecting circuit comprises a phototransistor.
Dependencies are inferred from the claim text.