Camera system
AssigneeCanon Kabushiki Kaisha
InventorsYoshihiko Aihara, Masayoshi Yamamichi, Masahisa Fujino
Life of this patent
Estimating the term…
Abstract
A camera system includes a camera body and a lens in which a motor circuit and an electric circuit are arranged and are supplied with electric power from a power source in the camera body. Ground contact terminals for the motor circuit and the electric circuit are separately arranged in the lens, and the motor circuit and the electric circuit are electrically connected to the power source negative terminal through the separate ground contact terminals.
Claims15
An accessory device constituting at least part of a photographic optical system and adapted to be mounted on a camera, said camera including a power source therein, a mount, a first electric circuit for producing control signals, first terminal means for outputting said control signal, second terminal means for supplying power from said power source, and first and second ground terminals for said power source, said first and second ground terminals being connected to said power source through separate electrical conductors, said accessory device comprising:
- (a) means for attaching the accessory device onto said mount of the camera;
- (b) third terminal means to be connected with said second terminal means when said accessory device is mounted on the camera and third and fourth ground terminals to be independently connected with said first and second ground terminals, respectively, said third terminal means and said third ground terminal being arranged so as to supply power to a motor circuit, said third terminal means and said fourth ground terminal being arranged so as to supply power to a second electric circuit;
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- (c) fourth terminal means to be connected with said first terminal means when said accessory device is mounted on the camera, said fourth terminal means being arranged to transmit said control signals to an input terminal means of said second electric circuit for operating said second electric circuit in accordance with said control signals.
An accessory device constituting at least part of a photographic optical system and adapted to be mounted on a camera, said camera including a power source therein, a mount, a first electric circuit for producing control signals, first terminal means for outputting said control signals, second terminal means for supplying power from said power source, and first and second ground terminals for said power source, said first and second ground terminals being connected to said power source through separate electrical conductors, said accessory device comprising:
- (a) means for attaching the accessory device onto said mount of the camera;
- (b) third terminal means to be connected with said second terminal means when said accessory device is mounted on the camera and third and fourth ground terminals to be independently connected with said first and second ground terminals, respectively;
- (c) fourth terminal means to be connected with said first terminal means when said accessory device is mounted on the camera;
- (d) a motor circuit connected to said third terminal means and said third ground terminal, and being supplied with power through said third terminal means and said third ground terminal, first electrical conductor means being connected between said third terminal means and said third ground terminal;
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- (e) a second electric circuit having input terminal means and connected to said third terminal means and said fourth ground terminal, said second electric circuit being supplied with power through said third terminal means and said fourth ground terminal, second electrical conductor means embodied separately from said first electrical conductor means being connected between said third terminal means and said fourth ground terminal, and the input terminal means connected with said fourth terminal means to operate said second electrical circuit in accordance with control signals provided through said fourth terminal means.
A camera system comprising:
- (a) a camera including:
- (1) a power source having first and second output sides,
- (2) a first electric circuit for producing an information signal, and
- (3) camera terminal means including power supply terminal means connected with said first output side of said power source and first and second terminals connected to said second output side of said power source, and information terminal means for providing said information signal;
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- (b) a lens device including:
- (1) a motor circuit,
- (2) a second electric circuit having input terminal means, and
- (3) lens device terminal means including lens device power supply terminal means to be connected with said power supply terminal means of the camera and third and fourth terminals to be independently connected with the first and the second terminals of the camera, respectively, said lens device power supply terminal means being connected with the power supply lines of the motor circuit and the second electric circuit, said third terminal being connected with a ground line of the motor circuit, said fourth terminal being connected with a ground line of the second electric circuit, said lens device terminal means also including lens device information terminal means to be connected with said information terminal means of the camera and connected to said input terminal means of said second electric circuit, said second electric circuit being operative in accordance with said information signal provided through such information terminal means.
An accessory device constituting at least part of a photographic optical system and adapted to be mounted on a camera, said camera including a power source therein, a mount, a first electric circuit for producing control signals, first terminal means for outputting said control signals, second terminal means for providing power from said power source, and first and second ground terminals for the power source, said first and second ground terminals being connected to said power source through separate electrical conductors, said accessory device comprising:
- (a) means for attaching the accessory device onto said mount of the camera;
- (b) third terminal means to be connected with said second terminal means when said accessory device is mounted on the camera and third and fourth ground terminals to be independently connected with said first and second ground terminals, respectively;
- (c) fourth terminal means to be connected with said first terminal means when said accessory device is mounted on the camera;
- (d) a motor circuit connected between said third terminal means and said third ground terminal and being supplied with power through said third terminal means and said third ground terminal;
- and
- (e) a second electric circuit having input terminal means and connected between said third terminal means and said fourth ground terminal for prevention of destruction of said second electrical circuit and being supplied with power through said third terminal means and said fourth ground terminal, and the input terminal means of said second electric circuit being connected to said fourth terminal means, said second electric circuit being operative in accordance with control signals provided through said fourth terminal means.
An accessory device constituting at least part of a photographic optical system and adapted to be mounted on a camera, said camera including a power source therein, a mount, a first electric circuit for producing control signals, first terminal means for outputting said control signals, second and third terminal means for supplying power from said power source, and first and second ground terminals for said power source, said first and second ground terminals being connected to said power source through separate electrical conductors, said accessory device comprising:
- (a) means for attaching the accessory device onto said mount of the camera;
- (b) fourth and fifth terminal means to be independently connected with said second and third terminal means, respectively, when said accessory device is mounted on the camera and third and fourth ground terminals to be independently connected with said first and second ground terminals, respectively, said fourth terminal means and said third ground terminal being arranged so as to supply power to a motor circuit, said fifth terminal means and said fourth ground terminal being arranged so as to supply power to a second electric circuit;
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- (c) sixth terminal means to be connected with said first terminal means when said accessory device is mounted ont he camera, said sixth terminal means being arranged to transmit said control signals to an input terminal means of said second electric circuit for operating said second electric circuit in accordance with said control signals.
A camera system comprising:
- (a) a camera including:
- (1) a power source having first and second output sides,
- (2) a first electric circuit for producing an information signal, and
- (3) camera terminal means including first and second power supply terminal means connected to said first output side of said power source and first and second ground terminals connected to said second output side of said power source, and information terminal means for providing said information signal;
- and
- (b) a lens device including:
- (1) a motor circuit,
- (2) a second electric circuit having input terminal means, and
- (3) lens device terminal means including first and second lens device power supply terminal means to be independently and respectively connected with said first and second power supply terminal means of the camera and third and fourth ground terminals to be independently connected with the first and the second ground terminals of the camera, respectively, said first lens device power supply terminal means being connected with the power supply line of the motor circuit and said second lens device power supply terminal means being connected with the power supply line of the second electric circuit, said third ground terminal being connected with a ground line of the motor circuit, said fourth ground terminal being connected with a ground line of the second electric circuit, said lens device terminals means also including lens device information terminal means to be connected with said information terminal means of the camera and connected to said input terminal means of said second electric circuit, said second electric circuit being operative in accordance with said information signal provided through such information terminal means.
Dependencies are inferred from the claim text.