Asahi Kogaku Kogyo Kabushiki Kaisha

Asahi Kogaku Kogyo K.k.

Asahi Optical Co., Ltd.

Isamu Hashimoto

Takao Nishida

Yutaka Ohsawa

Osamu Satou

Masahiro Kawasaki

Teruhiko Naruo

Shigeru Iwamoto

Takeomi Suzuki

Kenzo Ishibashi

A method for performing data communication between two circuits is provided. The method comprises the steps of: serially transmitting information between two circuits, determining a first level change in one direction of a pulse signal output from one of the circuits to the other as a reference time, judging whether a first data bit is '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, and determining the second level change in the one direction as the reference time relative to the next bit of data in the pulse signal, whereby data of a predetermined number of bits are continuously transmitted.

Data communication method between circuits

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.

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.

An exposure control apparatus of a camera includes a first switch which can select a plurality of drive modes including an auto-exposure bracket mode (AEB mode), a second switch which issues signals when operated, a third switch which can modify an exposure correcting value and a memory which stores a plurality of predetermined exposure correcting values. A drive mode selector successively selects the drive modes in response to signals from the second switch when the second switch is actuated during the operation of the first switch. A modifying device successively selects an exposure correcting value to be used to correct the exposure value among those stored in the memory in response to signals issued from the second switch when the latter is actuated during the operation of the third switch. A photographing controller is provided which takes a plurality of pictures at different exposure values in an exposure width correcting values selected by the modifying device when the AEB mode is selected. The controller also interrupts photographing when a release switch is turned OFF.

Exposure control apparatus of camera having an auto-exposure bracket mode

An exposure control apparatus of a camera includes a first switch which can select a plurality of drive modes including an auto-exposure bracket mode (AEB mode), a second switch which issues signals when operated, a third switch which can modify an exposure correcting value and a memory which stores a plurality of predetermined exposure correcting values. A drive mode selector successively selects the drive modes in response to signals from the second switch when the second switch is actuated during the operation of the first switch. A modifying device successively selects an exposure correcting value to be used to correct the exposure value among those stored in the memory in response to signals issued from the second switch when the latter is actuated during the operation of the third switch. A photographing controller is provided which takes a plurality of pictures at different exposure values in an exposure width correcting values selected by the modifying device when the AEB mode is selected.

Exposure control apparatus of camera having an automatic exposure

An electronic flash control device makes sure that the emission of light of an electronic flash is not impaired by a noise component signal prior to generation of a suitable quantity of light by the flash. A trigger signal is applied by the control device to allow the flash to emit light. An enable signal is supplied to a quenching circuit a predetermined time after the noise of the trigger signal has been produced. When the quantity of light from an object to be photographed by the camera reaches a certain value and the enable signal occurs, the quench circuit suppresses the emission of light by the electronic flash.

Electronic flash control device employing a plurality of control signals

Exposure control apparatus of camera

An electronically controlled camera is provided which has a back cover switch adapted to be turned ON/OFF according to the opening/closing position of a back cover; a back cover switch data detecting device for detecting switch data relating to the back cover switch, at a predetermined cycle, and for outputting such data; an erasable programmable memory for memorizing the switch data output from the back cover switch data detecting device; and a control device for comparing the switch data from the latest cycle output from the back cover switch data detecting device with the switch data from the preceding cycle read from the memory, and for controlling a film advance motor, a display system and the memory.

Electronically controlled camera

A photosensor apparatus for detecting focal position or the like, which uses a plurality of light-receiving elements arranged in a matrix array, is disclosed. Simultaneous light integration is started with respect to all the light-receiving elements, while all the outputs of the light-receiving elements are progressively scanned immediately after the start of the simultaneous light integration. When at least one of the outputs reaches a first reference level, all the outputs are held. If at least one of the held outputs is above a second reference level of a different level, check as to whether all the outputs are below the second reference level is repeatedly done for progressively reducing light integration periods until all the outputs of the light-receiving elements are at a fixed level.

Growing community of inventors

Tokyo, Japan

Isamu Hashimoto