摘要:
A photographing camera used with a film magazine device includes a film feed means and a first driving source for driving said feed means. The film magazine device includes means for taking up the film from said feed means and a second driving source for driving said take-up means the driving time required for said first driving source to feed a definite amount of film changes in accordance with a function as represented by a rectangular hyperbola relative to the output voltage of power supply means for said first and second driving sources. Apparatus for controlling said second driving source comprises drive control means for controlling the driving time of said second driving source so as to drive it for a time shorter than the driving time of said first one by a nearly constant time. The drive control means includes means for changing the driving time of said second driving source in approximation to a function as represented by another rectangular hyperbola.
摘要:
A camera in which a shutter device is charged in response to film wind-up and is released by shutter operating means to effect exposure, and including a change-over device displaceable for setting a film transport mechanism corresponding to each of film wind-up and rewind conditions, comprises means for preventing the operation of the shutter device in response to the displacement of the change-over device for setting the film transport mechanism in film rewind condition.
摘要:
A power supply circuit for use in a camera comprising solenoids for shutter release or shutter control etc. to be controlled by the proper vibration frequency of a piezoelectric element, comprising a constant voltage circuit for generating electric power for driving said solenoids, a switching circuit for supplying electric power from a power source of a motor drive unit to said constant voltage circuit in response to the actuation of a shutter button, and a voltage converting circuit for continuously supplying electric power from said power source of said motor drive unit to an oscillation circuit containing said piezoelectric element.
摘要:
An electric driving device of a camera for winding up a film by a motor comprises means for generating a windup signal when an exposure has been completed, means operable by reception of the wind-up signal to drive the motor for said wind-up, torque detecting means for detecting an increase in wind-up torque resulting from completion of said wind-up and putting out an output, and forcible stopping means responsive to the output of the torque detecting means to stop the motor separately from the operation of the motor driving means.
摘要:
A device to which a plurality of battery cases having different nominal voltages are selectively mountable and which checks the battery voltage of a mounted case comprises signal apparatus provided on each of the cases and which emits a discrimination signal capable of discriminating which of the cases has been mounted, voltage check apparatus including a plurality of voltage check circuits corresponding to the cases to check each of the output voltages of the batteries contained in the cases, and apparatus operatively associated with the signal apparatus during said mounting for selecting one of the voltage check circuits in accordance with the discrimination signal and applying to the selected voltage check circuit the output voltage of the battery contained in the mounted case as a voltage to be checked.
摘要:
A camera has a digital exposure display device and a digital fixed point match type exposure display device. The digital exposure display device compares a voltage associated with an exposure value such as a shutter time value or an aperture value obtained from exposure operating means with a plurality of reference voltages produced by a reference voltage generating circuit and thereby converts the exposure value into a digital signal and digitally displays the exposure value on the basis of said digital signal. The digital fixed point match type exposure display device comprises an exposure value setting circuit for generating a voltage associated with a manually set exposure value, differential amplifier circuit means for producing a voltage including a voltage corresponding to the difference between the voltage of the exposure value setting circuit and the voltage obtained from the exposure operating means, forming means for forming a first comparison voltage and a second comparison voltage greater than the first comparison voltage by using the output voltage of the reference voltage generating circuit, comparing means for comparing the comparison voltage of the forming means with the output of the differential circuit means and generating a first signal variable in condition depending on whether said output is smaller or greater than the first comparison voltage and a second signal variable in condition depending on whether said output is greater or smaller than the second comparison voltage, and display means operative to effect a display based on the first and second signals of the comparing means.
摘要:
A drive circuit for pulse synchronized motor has a circuit for generating an output signal corresponding to the frequency of synchronizing pulse signals and a voltage setting circuit for automatically setting, according to the output of the output circuit, the voltage to be applied to the motor within a synchronizable voltage range of frequency of the synchronizing pulse signals for synchronizing the motor. The drive circuit is capable of automatically maintaining synchronized state over a wide frequency range.
摘要:
A camera is capable of using a film cartridge bearing code indicia indicating the film speed of the film contained in the cartridge. The camera comprises first means for detecting the film speed from the code indicia of the film cartridge loaded in the camera and generating a first corresponding signal, and second means for manually setting the film speed and generating a second corresponding signal. The camera further comprises discriminator means connected to the first and second means and adapted to generate an output signal upon detection that neither the first nor the second signal is generated, and means for generating an alarm in response to the output signal of the discriminator means.
摘要:
A camera into which a magazine containing a film therein and provided with means indicative of information concerning the film speed of the film can be loaded includes a device for detecting the film speed of the film on the basis of the information when the magazine is loaded into the camera and producing a first film speed signal indicative of the detected film speed, a device for manually setting the film speed of the film and producing a second film speed signal indicative of the set film speed of the film, a device for detecting the difference between the film speeds of the film indicated by the first and second film speed signals and producing a warning signal, a device for drawing out the film from the loaded magazine, and a device for hindering the production of the warning signal in response to the draw-out of a predetermined amount of film from the magazine.
摘要:
An integrated circuit has an input voltage-clamping function and an input current-detecting function. A voltage-clamping circuit is provided for clamping a voltage at the input signal terminal, the voltage being clamped in response to an input current greater than a first predetermined value supplied to the input terminal. A current detecting circuit is also provided for detecting whether the input current supplied to the input terminal is greater than a second predetermined value, whereby the single input terminal for signals is used for both functions, i.e., the input voltage-clamping function and the input current-detecting function.