Camera system operable by carrying data from a camera accessory to a camera body
First Claim
1. In a camera system operable by means transmitting data from a camera accessory to a camera body, the camera accessory comprising:
- means for storing various data at a plurality of addresses, respectively, the data each consisting of a plurality of bits;
means for receiving a train of clock pulses from a camera body;
means for sequentially designating the addresses of said storing means one by one to let said storing means output a data stored at the designated address, including first means for originally forming at least a part of an address signal within the camera accessory in response to the clock pulses received by said receiving means to designate an address; and
means for transmitting the data derived from said storing means to the camera body, whereby there is no necessity to receive a prepared address signal from the camera body.
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Accused Products
Abstract
A camera system operable with data carried from a camera accessory to a camera body. The camera accessory has a ROM for storing various data at a plurality of addresses, respectively, each of which data consists of a plurality of bits, and a coupling terminal for receiving a train of clock pulses from the camera body. A circuit is also provided for sequentially designating the address of the ROM one by one to permit the ROM to output data stored at the designated address. In the circuit, an address signal is formed in response to the clock pulses, received through the coupling terminal, for designating an address. The data derived from the ROM are transmitted to the camera body.
86 Citations
31 Claims
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1. In a camera system operable by means transmitting data from a camera accessory to a camera body, the camera accessory comprising:
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means for storing various data at a plurality of addresses, respectively, the data each consisting of a plurality of bits; means for receiving a train of clock pulses from a camera body; means for sequentially designating the addresses of said storing means one by one to let said storing means output a data stored at the designated address, including first means for originally forming at least a part of an address signal within the camera accessory in response to the clock pulses received by said receiving means to designate an address; and means for transmitting the data derived from said storing means to the camera body, whereby there is no necessity to receive a prepared address signal from the camera body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. In a camera system operable by means of carrying data, to a camera body, from a camera accessory consisting of an interchangeable objective lens with a variable diaphragm aperture, the camera body comprising:
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means for receiving from the camera accessory data relating to a time taken for the variable diaphragm aperture to complete the variation of its aperture size; means for transmitting driving power to the objective lens to control the diaphragm aperture; means for controlling said driving power transmitting means to initiate the variation of the aperture size; a reflex mirror movable from a first position projecting into a light path of the objective lens to a second position retracting therefrom; and means for initiating the movement of said reflex mirror from the first to the second position after the initiation of the variation of the aperture size with a delay determined by the data received by said receiving means.
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12. In a camera system operable by means of transmitting data from a camera accessory to a camera body, the camera accessory comprising:
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means for manually setting a photographic information at a desired value; means for storing various data at a plurality of addresses, respectively, said storing means storing a plurality of kinds of data each varying in dependence on the value of the photographic information to be set by said setting means, wherein the data are respectively stored in different addresses for each kind of data and at every value of the photographic information; means for receiving a digital signal from the camera body to determine the kind of the data; means for sequentially designating the addresses of said storing means one by one in response to the value set by said setting means and the digital signal received by said receiving means, to let said storing means output a data stored at the designated address; and means for transmitting the memory data derived from said storing means to the camera body. - View Dependent Claims (13, 14, 15)
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16. In a camera system operable by means of carrying data from a camera accessory consisting of an interchangeable objective lens to a camera body combined with a lens converter, the combination of the camera body and the lens converter comprising:
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means for receiving from the objective lens data representative of a fully open aperture value of the objective lens; means for measuring scene light through the objective lens and the lens converter; first means for providing an electric signal representative of a film speed of a film to be used; second means for providing an electric signal relating to a change in an effective aperture value of the objective lens caused by the combination of the lens converter with the camera body; and first means for calculating a desired effective aperture value, which is free from the influence of the fully open aperture value and the change in the effective aperture value caused by the combination of the lens converter, in response to said receiving means, said measuring means and said first and second providing means. - View Dependent Claims (17)
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18. In a camera system operable by means of carrying data from a camera accessory to a camera body, the camera accessory consisting of a zoom lens with a variable focal length and a diaphragm aperture comprising:
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means for manually setting the focal length at a value; means for storing various data at a plurality of addresses, respectively, said storing means storing data relating to the effective aperture value which varies in dependence on the value of the focal length; means for receiving a digital signal from the camera body; means for receiving an electric power from the camera body; means for designating an address of said storing means in response to said setting means to let said storing means output data stored at the designated address; means for transmitting the data derived from said storing means to the camera body; and means for receiving a driving power from the camera body to control the diaphragm aperture. - View Dependent Claims (19)
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20. In a camera system operable by means of carrying data, to a camera body, from a camera accessory consisting of a zoom lens with a variable focal length and a diaphragm aperture, the camera body comprising:
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means for transmitting a digital signal to the zoom lens; means for transmitting an electric power to the zoom lens; means for receiving data relating to the effective aperture value, which varies in dependence on the value of the focal length, from the zoom lens; and means for transmitting driving power to the zoom lens to control the diaphragm aperture. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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29. In a camera system operable by means of carrying data from a camera accessory to a camera body, the camera accessory consisting of an interchangeable objective lens with a variable diaphragm aperture comprising:
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means for storing electric data relating to a time taken for the variable diaphragm aperture to complete the variation of its aperture size; means for transmitting the electric data derived from said storing means to the camera body; and means for receiving driving power from the camera body to control the diaphragm aperture. - View Dependent Claims (30)
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31. In a camera system operable by means of carrying data, to a camera body, from a camera accessory consisting of an interchangeable objective lens, the camera body comprising:
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means for receiving the data from the objective lens; means for identifying a predetermined data to be received by said receiving means; an opening at which the objective lens is to be mounted; means for measuring light through said opening; means for providing a data representative of a film speed of a film to be used; means for reading data representative of a fully open aperture value of the objective lens to be received by said receiving means; and means for changing between a first mode and a second mode of exposure operations in response to said identifying means, wherein the exposure operation is responsive to said measuring means, said providing means and said reading means in said first mode when said identifying means succeeds in identifying said predetermined data, and to said measuring means and said providing means in said second mode when said identifying means fails in identifying said predetermined data.
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Specification