Abstract: At the side of the camera body, switches for treating the totally opened F value information of the photographic lens as coded digital information of a certain determined number of bits are connected to the digital exposure operation circuit. At the side of each of the photographic lens which is made interchangeable for the camera body, a signal pin is arranged for indicating the totally opened F value proper to the photographic lens as coded digital information of the above mentioned determined number of bits in such a manner that at the time of mounting the photographic lens on the camera body, the switches at the side of the camera body are closed in selected combination in accordance with the totally opened F value of the lens. Accordingly the totally opened F value of the photographic lens is put into the digital exposure operation circuit.

Abstract: A camera having a digital exposure control device which converts photographing informations into digital amounts and computes them according to the Appex system, and in which the Appex value of the photographing conditions supplied by the above computing operation is converted into practical indications such as numerical references.

Abstract: A camera of the type in which the shutter actuator is operated by means of an electromagnet or a permanent magnet associated with a solenoid has a film winding mechanism and a shutter tensioning mechanism operatively connected with each other through an improved interconnecting mechanism which includes a cam arrangement and a switching arrangement for the electromagnet or the solenoid. The cam arrangement is constructed as having complementary camming surfaces to facilitate the minimization of dimensions of the interconnecting mechanism. During the film winding or shutter tensioning operation, the electromagnet or the solenoid is rendered inoperative or operative respectively by the switching arrangement to thereby reduce the torque of a single operating member for the film winding and shutter tensioning mechanisms.

Abstract: An automatic exposure control device to convert the analogue value of an object to be photographed, to digital value for controlling appropriate exposure value using said digital value. The device has a photo-sensing means to sense the light from the object digitally, a photographing information setting means to digitally set various photographing information such as film sensitivity, diaphragm aperture value, shutter speed, etc.

Abstract: A plural number of switches which are selectively opened and closed comprise a first switch corresponding with the weight "2/3" in APEX value and a second switch corresponding with the weight "1/3" in APEX value while a n bit register comprises a first bit with the weight "1/2" in APEX value, a second bit with the weight "1/4" in APEX value and a third bit with the weight "1/8" in APEX value. The closing signal of the first switch is put in the first bit, the closing signal of the second switch in the second bit and the closing signal of the third switch in the third bit so as to carry out the approximate conversion of the data.

Abstract: A photographic camera having a manually and automatically adjustable diaphragm is provided with an electromagnetically operated diaphragm scanning mechanism in combination with a manually operable depth of field pre-viewing device to enable a visual determination of the utilizable zone of sharpness in a reflex viewfinder of the camera regardless of the fact that the camera remains in the run down position. For this purpose, the diaphragm scanning mechanism includes a scanning member and a driving member arranged to establish driving connection therebetwen during the automatic adjustment of the diaphragm. Release means is provided and is responsive to the termination of closing operation of the camera shutter for effecting release of the driving connection, whereby the photographer before cocking the camera is enabled to manipulate the diaphragm followed by the pre-viewing device to read off the range of sharpness in dependence on the manual setting of the diaphragm for use in making a subsequent exposure.

Abstract: The analog signal corresponding to the brightness of the object to be photographed is converted into a digital signal by means of an A-D converter while a shutter control means adjust the shutter mechanism in accordance with the digital signal stored in the A-D converter whereby at the same time, a digital information indicating circuit indicates digitally the digital signal stored in the A-D converter. Hereby, the digital information indicating circuit is connected with the timing pulse forming circuit in such a manner that the indication circuit repeats the indication by means of the timing pulse forming circuit with a period allowing the photographer to visually recognize the digital information of the indicating circuit.

Abstract: In the camera exposure control apparatus disclosed, a light sensor produces a first analog signal corresponding to the brightness of an object to be photographed. This signal is compared to a gradually varying second analog signal. The variation of the second analog signal is discontinued when the first and second signals reach a predetermined relationship and the second analog signal is stored. As the aperture of the camera's diaphragm is varied, the stored signal is compared with an analog signal corresponding to the diaphragm opening to produce a control signal that inhibits aperture variation when the latter compared signals reach a predetermined relationship.

Abstract: The present invention relates to an exposure information setting device for a camera having a digital control system in which the aperture value of the lens is applied to the exposure amount control circuit as digital information by means of the aperture value setting mechanism. The device is so designed that the first comb tooth shaped conductor pattern and the second comb tooth shaped conductor pattern are arranged in parallel with each other in such a manner that a phase difference takes place between them. A pair of series of pulses are obtained by making the contact in functional engagement with the aperture value setting operation, moving slidingly over the first and the second conductor patterns. The direction along which the aperture value information varies is detectable by applying the pair of series of pulses thus obtained to the exposure operational circuit through the phase sorting circuit.

Abstract: A photographing information display circuit for a camera which performs digital computation of information relative to exposure, etc. and displays the computed digital values. The display of the digital value computed is effected through an analog display circuit such as a meter circuit by an extremely simplified circuit arrangement, without using any D-A conversion circuit such as a ladder circuit or the like. The invented display circuit arrangement minimizes the electric power requirement for display to solve the problem of electric power consumption for display in small-sized camera.

Abstract: An exposure control apparatus for a photographic camera wherein various exposure control parameters after being digitized are applied to a computer. The computer then derives an exposure value based on digital computation. The apparatus is provided with combined means for converting the preselected exposure control parameters to corresponding mechanical displacements and for converting the displacements directly to corresponding numbers of pulses, whereby the computer is made responsive to the numbers of pulses.

Abstract: An apparatus for setting an exposure control factor into a camera in the form of a digital signal without using a code plate or a plurality of switches. A pulse train is fed to a binary counter through an AND circuit which, upon selective receipt of gating-on and gating-off signals, operates to initiate and terminate flow of pulses therethrough respectively. When the counter has counted the selected number of pulses, the photographer who is viewing a digital display unit cooperative with the counter to detect this pulse number may actuate a button to produce the gating-off signal, thereby a corresponding desired value of the exposure control factor is set into the camera as a function of the number of pulses counted.

Abstract: The present invention relates to a counter circuit for a camera in which an exposure information is converted into a number of pulses in accordance with the exposure information while a brush is moved sliding on conductor contacts, particularly to a counter circuit so designed that the influence of the pulses generated due to the chattering at the time of the contact of the brush with the conductor contacts upon the counter circuit is prevented.

Abstract: The present invention relates to a camera with a displacement means for controlling the exposure amount as the function of the mechanical displacement position. The displacement means are so designed that a brush is slid over a comb-shaped conductive pattern mechanically linked with the displacement means so as to convert the displacement position of the displacement means into a pulse number.

Abstract: A system for indicating photographic information which includes a circuit for converting an optical signal into an electrical signal. Comparing elements are provided for comparing the electrical signal with one of a plurality of reference signals having different levels, and electrical elements serve to produce an indication signal responsive to the output from one of the comparing elements. A plurality of luminescent components are connected to the signal producing element for turning-on in response to an indication signal. A plurality of indicating segments indicate the photographic information which the luminescent elements irradiate, the number of indicating segments being less than the number of luminescent elements and at least one of the indicating elements is selectively illuminated by more than one of the luminescent elements.

Abstract: A number of separate comparators compare respective analog inputs to a single reference waveform and turn off respective gates when the analog voltages achieve predetermined relationships to reference wave form. The gates pass pulses from a common source from the beginning of the reference wave form until the respective gates are shut off. In one version the analog signals represent photographic data such as diaphragm aperture and shutter speed in a camera, and are digitized for display within the camera.

Abstract: A device for preventing erroneous handling of a camera capable of dual type automatic exposure control including shutter time preference and diaphragm preference, wherein the device senses whether the camera is set at a diaphragm preference position or at a diaphragm automatic adjusting position with regard to the diaphragm setting means, and whether the shutter time preference position or the shutter time automatic adjusting position is selected for the shutter time setting means. The camera is rendered inoperative when both the diaphragm setting means and the shutter time setting means are set in their respective preference positions.

Abstract: This invention relates to photographic cameras, and more particularly to an exposure control circuit of the type in which an analog output representative of the object brightness level is converted to a digital signal which is factored into an exposure value, and the period of actuation of the camera shutter is controlled in accordance with this exposure value. Still more particularly, it relates to an improvement over this conventional type exposure control with respect to the A-D conversion. The prior art converts a voltage representative of the object brightness to a digital form by the use of an A-D converter such as of the follow comparison type which is characterized by the lack of integrating aspect in converting the input voltage to the corresponding digital signal.

Abstract: The present invention relates to an equipment which converts various data, including exposure setting data, for a photograph into codes so as to be stored in a register in order that the data stored in the register is later decoded and registered on the film. The equipment comprises a decoder for reading out and decoding the stored data in accordance with a signal corresponding to the feeding of the film and a plural number of registering heads operated by means of the output of the decoder, whereby the stored data is registered on the film in general indications such as letters or figures.

Abstract: An exposure control device for a single lens reflex camera includes an adjustable shutter which is arranged to furnish a plurality of exposure times, and an adjustable electrical delay circuit which is operative to adjust the shutter to select the exposure time. An adjustable diaphragm device is also included which is arranged to furnish a plurality of aperture sizes and is mounted into a lens and which further includes means for receiving light from a photographing object through the diaphragm device and converting it into electrical signal. A diaphragm determining means is connected with the diaphragm device to select an aperture size, and which is connected to the receiving means and further includes means for detecting the adjustable aperture limit connected with the delay circuit to compensate the adjusted exposure time for proper exposure. A manually operated selector means is included for adjusting the diaphragm determining means to insert the adjusted time thereinto.