Abstract: A method for performing data communication between two circuits. Information is serially transmitted between two circuits. A first level change in one direction of a pulse signal output from one of the circuits to the other is determined as a reference time. A first data bit is determined to be a "1" or "0" in accordance with a time period from the reference time to a second level change in the one direction following the reference time. The second level change in the one direction as the reference time relative to the next bit of data in the pulse signal is then determined, whereby data of a predetermined number of bits are continuously transmitted.

Abstract: A method is disclosed for performing data communication between a pair of circuits. The data communication is established by serially transmitting information which includes pulse signals. In executing the method, a reference time is determined as an instant of a first level change in a first direction of a pulse signal output from one of the circuits to the other. A judgement is made as to whether a first bit of data is a "1" or a "0" in accordance with a time period extending from the reference time to an instant of a subsequent level change in the first direction following the reference time. The instant of the subsequent level change in the first direction is determined as a reference time relative to the next bit of data in the pulse signal. The data of a predetermined number of bits is continuously transmitted by repeatedly establishing reference times and judging the value of a bit based on the time period which extends from the reference time to a subsequent level change.

Abstract: A flash device for a photographing camera comprising an ordinary flash mechanism, an improved flash mechanism including a part of the ordinary flash mechanism, an operation mode controller which selectively switches the operation mode of the flash mechanisms and a control terminal which is provided in addition to terminals electrically connecting the ordinary flash mechanism to the photography camera, the control terminal electrically coupling the operation mode controller to the camera, and with the switching of operation modes of the ordinary flash mechanism and the improved flash mechanism being changed by the operation mode controller in response to an input signal to the control terminal.

Abstract: A data imprinting device for a camera is provided which imprints symbolic data on a part of a photographing film. The data imprinting device comprises an object luminance photometric sensor for detecting luminance of an object in the vicinity of a symbolic data imprinting area, and a light emitting means including a light source for imprinting symbolic data in a photographing film. The brightness of the light source is controllable. In addition the device comprises a control means for controlling the brightness of the light source in the light emitting means according to the luminance of the object in the vicinity of the symbolic data imprinting area which is detected by the object luminance photometric sensor. In a second embodiment, the quantity of light emitted by the printing section is controlled according to the relationship between the detected luminance of the symbolic data imprinting area and the detected luminance of the areas other than the symbolic data imprinting area.