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US 4,062,024 AGranted
Control system consisting of semi-conductor integrated circuits for a camera
AssigneeCanon Kabushiki Kaisha
InventorsTokuichi Tsunekawa, Masanori Uchidoi, Masami Shimizu, Masayoshi Yamamichi, Keiya Murayama, Hiroshi Aizawa
Life of this patent
Estimating the term…
Abstract
The present invention relates to a control system consisting of a semi-conductor integrated circuit for a camera, particularly a control system from providing secure operation as well as a reduction of complexity. The system provides for separation of actuating signals from the low level signals for the integrated circuit so as to prevent added noise of the actuating signals from mixing with the low level signal.
Claims12
A camera with electronic control function comprising:
- A. a camera body;
- B. photographic lenses, said lenses being interchangeably mounted on the camera body and presenting certain determined maximum aperture values;
- C. an exposure adjusting device, said device being built in the camera body and including:
- a. a light sensing means, said means being provided at the position at which the light beam coming through the photographic lenses is received so as to produce an electrical signal,
- b. an exposure value setting means, said means setting other set exposure informations than the exposure informations to be adjusted so as to produce an electrical signal,
- c. an exposure measuring circuit, said circuit including an input to be connected to the light sensing means, an output and a first current supply input and being composed as a first integrated circuit,
- d. an exposure operation circuit, said circuit including an input to be connected to the exposure value setting means and an input to be connected to the exposure measuring circuit and a second current supply input for said circuit to operate effectively,
- e. an exposure control circuit, said circuit including an input to be connected to the output of the exposure operation circuit, an output for giving an output signal corresponding to the exposure information value to be adjusted and a third current supply input for said circuit to operate effectively,
- f. an exposure determining means, said means being functionally engaged with the photographic lenses so as to restrict the light beam passing through the lenses further said means including an electromagnetic means functionally engaged with the exposure control circuit;
- and
- D. a current supply control circuit, said circuit being built in the camera body and including a current supply output for supplying the current to the first, the second and the third current supply input in functional engagement with the actuation of the camera body and further including a signal producing circuit for supply current to the third current supply input later than the first and the second current supply input.
8 more elements
A camera with electronic control function comprising:
- A. a camera body;
- B. photographic lenses, said lenses being interchangeably mounted on the camera body;
- C. exposure adjusting device, said device being built in the camera body and including:
- a. a light sensing means, said means being provided at the position at which the light beam coming through the photographic lenses is received so as to produce an electrical signal;
- b. An exposure value setting means, said means setting other set exposure informations than the exposure informations to be adjusted so as to produce an electrical signal,
- c. an exposure measuring circuit, said circuit including an input to be connected to the light sensing means, and output and a first current supply input and being composed as a first integrated circuit,
- d. an exposure operation circuit, said circuit including an input to be connected to the exposure value setting means and an input to be connected to the exposure measuring circuit and a second current supply input for said circuit to operate effectively,
- e. an exposure control circuit, said circuit including an input to be connected to the output of the exposure operation circuit, an output for giving an output signal corresponding to the exposure information value to be adjusted and a third current supply input for said circuit to operate effectively,
- f. an exposure determining device, said device being built in the camera body, and being controlled in its operation by the output signal of the exposure control circuit, and
- D. a current supply control circuit, said circuit being built in the camera body and including a current supply output for supplying the current to the first, the second and the third current supply input in functional engagement with the actuation of the camera body and further including a signal producing circuit for supply current to the third current supply input later than the first and the second current supply input.
7 more elements
Dependencies are inferred from the claim text.