A camera system is capable of exactly catching the subject at the time of release operation by the imaging device of the camera head in accordance with the release button operation at the side of the camera main frame, even if the camera head and the camera main frame are not formed in a unitary body. There are provided two dedicated lines for supplying to a head CPU a release signal according to the half-depression and a release signal according to the full-depression, respectively. Other signals are transmitted via serial interfaces to be driven by three-wire serial drivers. Only the release signals are transmitted from the camera main frame via the two dedicated lines to the camera head.
1. A camera system comprising: a camera head comprising an imaging optical system and an imaging device; and a camera main frame that receives an image signal from the camera head via an interface for transferring signals between the camera main frame and the camera head so as to perform signal processing,
wherein the camera head comprises a first CPU and a timing generator that supplies exposure start signal and exposure completion signal according to a shutter speed of an electronic shutter to the imaging device in accordance with a control of the first CPU,
the camera main frame comprises a second CPU and a release button for communicating a signal of a photography start to the second CPU, and
the camera system further comprises a dedicated line connecting the camera main frame with the camera head, the dedicated line supplying a release signal according to depression of the release button to the first CPU of the camera head when the release signal is supplied to the second CPU in accordance with the depression of the release button.
2. A camera system according to claim 1 , wherein the release button has two operational modes of a half-depression mode for instructing a photography preparation and a full-depression mode for instructing a photography, and,
the camera main frame transmits a release signal according to a half-depression via the interface to the camera head, and transmits a release signal according to a full-depression via the dedicated line to the camera head.
3. A camera system according to claim 2 , wherein when the camera head receives the release signal according to the frill-depression before a receipt of the release signal according to the half-depression, the camera system performs a photography preparation in accordance with a receipt of the release signal according to the full-depression to perform a subsequent photography.
4. A camera system according to claim 1 , wherein the release button has two operational modes of a half-depression mode for instructing a photography preparation and a full-depression mode for instructing a photography, and,
the camera main frame transmits both the release signal according to the half-depression and the release signal according to the full-depression via the dedicated line to the camera head on a mutually distinguishable basis.
5. A camera system comprising: a camera head comprising an imaging optical system and an imaging device; and a camera main frame that receives an image signal from the camera head via an interface for transferring signals between the camera main frame and the camera head so as to perform signal processing,
wherein the camera head has a timing generator that supplies exposure start signal and exposure completion signal to the imaging device,
the camera main frame has a flash emission section for emitting a flash in synchronism with photography, and
the camera system further comprises a dedicated line connecting the camera main frame with the camera head, wherein a light emission instruction signal is supplied from the camera head via the dedicated line to the camera main frame so that the flash emission section emits a flash during an exposure by the imaging device.
6. A camera system according to claim 5 , wherein the light emission instruction signal comprises a light emission start signal and a light emission stop signal, and the flash emission section starts a flash emission upon receipt of the light emission start signal and stops the flash emission upon receipt of the light emission stop signal, and
the dedicated line comprises two dedicated lines of a first dedicated line for transmitting the light emission start signal and a second dedicated line for transmitting the light emission stop signal.
7. A camera system according to claim 5 , wherein the light emission instruction signal comprises a light emission start signal and a light emission stop signal, and the flash emission section starts a flash emission upon receipt of the light emission start signal and stops the flash emission upon receipt of the light emission stop signal, and
the dedicated line comprises a single dedicated line for transmitting both the light emission start signal and the light emission stop signal.
8. The camera system of claim 1 , wherein the dedicated line connecting the camera main frame with the camera head further comprises a direct connection between the shutter release button and the first CPU of the camera head.
9. The camera system of claim 8 , wherein the direct connection exclusively carries the release signal according to depression of the release button.