Abstract: A high accuracy timer actuating mechanism in a leaf type digital clock having a timer, a manually actuatable timer setting drum and a rotating clutch cam cooperating therewith so as to actuate a clutch lever at a set time manually set in the timer setting drum so that a switch for actuating the timer is closed by the actuation of the clutch lever. The clutch lever is provided with an arresting lug which is releasably arrested by an ON-OFF lever so that, when the clutch lever is arrested by the ON-OFF lever, the switch is held opened so as to render the timer to be inoperative. An actuating lever cooperates with the ON-OFF lever and is actuated by a plurality of cam projections of an actuating cam rotated together with the minute indicating drum so as to release the ON-OFF lever from the clutch lever thereby permitting the same to be actuated by the clutch cam.

Abstract: A focal plane shutter comprising a pair of upper arms rotatably supported on a shutter base plate and arranged with a spacing between them, a pair of lower arms overlapped respectively on said pair of upper arms with a spacing, three main shutter blades respectively supported by said upper arms so as to have overlapped portions even when developed between the respective pairs of upper arms and lower arms, and two auxiliary shutter blades respectively supported by the lower arms so as to overlap on the above mentioned overlapped portions when developed between the respective pairs of the upper arms and lower arms, in order to make the entire shutter device or particularly the dimensions in the vertical direction smaller. Tail portions are formed respectively at the free ends of the main shutter in the middle and the auxiliary shutter blades.

Abstract: An exposure controlling circuit for electric shutters incorporating therein a voltage drop detecting circuit which will issue a signal for passing a current to a coil for closing a shutter when a current source voltage becomes lower than a predetermined voltage in order to prevent the shutter closing motion from being made unable to be made by the drop of the current source voltage after the shutter is opened. This controlling circuit further includes a driving circuit for making an indication within the field of vision of the view finder of a photographic camera when a signal is issued from the voltage drop detecting circuit.

Abstract: A leaf type indicating device provided with a synchronizing piece made of a spring material, rotatably mounted on a main shaft and having a side portion engageable with a lug formed on one leaf belonging to a first indicating leaf group having a large number of turns per unit time, a bent portion engageable with at least one leaf belonging to a second indicating leaf group arranged adjacently to the first indicating leaf group and having a small number of turns per unit time and an end portion inserted in a hole formed in a body frame and connected with the body frame in order to make the manufacture at a low cost possible.

Abstract: A controlling circuit for electric shutters wherein, in an electric shutter adapted to start a shutter closing moton by energizing a driving coil with a discharge current from a capacitor, the capacitor is made to be discharged by a voltage drop detecting circuit provided so that the shutter may be positively closed even in case a current source switch is opened by an unexpected accident in the course of an exposure controlling operation.

Abstract: A flash synchronization controlling circuit for program type electric shutters. A first switching circuit is utilized for controlling the shutter closing and a second switching circuit is connected to the first switching circuit and utilized for controlling the flash actuation in order that the flash synchronization controlling circuit may be simplified and to provide a very positive and stable flash synchronizing operation. The flash synchronization controlling circuit is arranged so that the switching operation of the second switching circuit can be effected earlier by a predetermined time interval than that of the first switching circuit.

Abstract: A mechanism for actuating a platen of a printer in which a cooperating pin and lever are provided to permit a plurality of printing rings with the desired characters thereon to be printed to be placed into a printing position, to move a platen into abutting engagement with the printing rings and hold them engaged for printing, all during a first period of time, and to remove the platen from the printing rings during a second period of time, and in which the first time period is about two to three times longer than the second time period so that the speed of the printer for each printing operation is increased.

Abstract: A focal plane shutter comprising a pair of upper arms rotatably supported on a shutter base plate, a pair of lower arms provided as opposed to the respective upper arms so as to be rotatable concentrially respectively with the pair of upper arms and a plurality of shutter blades of which some are supported by the upper arms and the remainder are supported by the lower arms between the respective pairs of upper arms and lower arms, whereby the dimensions in the horizontal direction and vertical direction of the entire shutter device can be made smaller.

Abstract: A light leakage preventing device for focal plane shutters made by interposing a shielding member between a view finder optical system and shutter base plates to intercept a light reaching a film surface through an air gap defined by the shutter base plates from within the view finder optical system. Said shielding member is moved from a light intercepting position to a non-light intercepting position by an interlocking lever operated between the operation of a release button of a photographic camera and the beginning of the operation of shutter blades and is moved from the non-light intercepting position to the light intercepting position simultaneously with the introduction of a light into the view finder optical system from an object to be photographed.

Abstract: A light diffusing device for obtaining a surface uniform in the brightness by using a luminous flux narrow in the radiating angle comprising a flat smooth transparent base plate having a favorable transparency and including a luminous flux incident area defined on one side surface, a conical concavity formed on the other side surface opposed to said one side surface, aligned with the luminous flux incident area and having a bottom area at least equal to said area and light diffusing reflecting means provided on all the side surfaces except the above mentioned other side surface. Said luminous flux incident area is used as a connecting part with the end portion of a light guide or a containing section for a light source. The above mentioned other side surface serves as a displaying surface for such display medium as of words or signs or as a luminous surface for introducing lights of a uniform brightness into a plurality of light guides.

Abstract: A device is provided for indicating fading operation in cinecamera. A control circuit receives the scene light indicating voltage and a manually adjusted output voltage for operating a diaphragm driving means to adjust the aperture to a proper value for the scene brightness an RC circuit is connected to the diaphragm control circuit which selectively applys either a constant charging or discharging voltage to the diaphragm control circuit, this causes the control circuit to drive the diaphragm to continuously vary the aperture for effecting the fading-out and the fading-in of the scene. A first comparator receives the output voltage of the RC circuit and the output voltage of the diaphragm control circuit and produces a signal when both voltages are coincident.

Abstract: A timer device wherein a timer cam disk to be moved from a non-operating position to an operating position at a preset time point in cooperation with a timer setting drum is so formed as to be returned to the non-operating position from the operating position at a comparatively higher speed only during a predetermined time period after it is moved from the non-operating position to the operating position in order to prevent the time during which the timer cam disk is maintained in the operating position from becoming unnecessarily long.

Abstract: The automatic diaphragm controlling device comprises an electric source, a servomotor having a single driving coil for driving a diaphragm of an objective lens, a scene light indicating voltage generating circuit and a reference voltage generating circuit energized by the electric source, respectively, the servomotor being controlled by the difference between the output voltages of both circuits so that a proper exposure is obtained.

Abstract: Line printer having a plurality of coaxially arranged rotatable printing rings each bearing a series of characters to selectively effect printing on a paper and a platen movable toward in contact with and away from the printing rings so as to effect printing on the paper interposed between the platen and the printing rings when the platen abuts against the printing rings, each of the printing rings being selectively arrested by a select lever actuated by the printing signal from a control system of the printer thereby positioning desired characters of the respective printing rings in the printing position at which the platen abuts against the printing rings so that a line of printing is produced on the paper simultaneously. The printer comprises a mechanism for additionally printing a mark such as an underline and the like adjacent to particular characters printed on the paper. The mechanism is moved to the printing position by a signal from the control system.

Abstract: A controlling circuit for electric shutters comprising at least one constant current circuit, a pair of capacitors to be charged in advance by a current source battery through the constant current circuit and a pair of driving coils to be energized in turn by discharge currents of the pair of capacitors to start a shutter blade opening motion and closing motion so that the current source battery of a comparatively small capacity may be effectively used.

Abstract: An electric shutter of a program type provided with a single actuating spring connected at one end with a shutter blade opening and closing lever and at the other end with a closing actuating member. One end of the actuating spring acts to open the shutter blades through the opening and closing lever and the other end acts to close the shutter blades through the closing actuating member and opening and closing lever so that the structure may be simplified and the shutter releasing operation may be made with a light force. A spring acting to press an armature lever against an electromagnet is so arranged as to lose its action when the closing actuating member is in an uncocked position. Further, this electric shutter is provided with a synchroswitch so arranged as to be closed after the lapse of a predetermined time after the shutter is released irrespective of the diaphragm aperture to be set so that a flash-photographing may be positively made.

Abstract: A fade-in and fade-out device of an automatic servomechanism for controlling the diaphragm exposure of cinecamera. A differential amplifier having a first input voltage corresponding to the scene light and a second reference input voltage corresponding to the requisite exposure, produces a differential control voltage which is applied to the diaphragm during fade-in or fade-out.

Abstract: The coreless cylindrical armature has a cylindrical coil made of at least one coil unit which includes a plurality of lead wires. Each lead wire traverses at least twice between the peripheral edges of the coil cylinder as it makes one turn around the coil cylinder. The lead wires are regularly spaced angularly of the coil cylinder to provide a full pitch winding that is two layers thick throughout as a result of the winding, but for a respective plurality of apical regions marginally of each peripheral edge of the coil cylinder. Several ultimate dispositions of these apical regions are described.

Abstract: A braking mechanism for focal plane shutters provided with a brake operating member pivoted in the tip portion of a shutter blade actuating member so as not to be freely movable and capable of taking an operating position and a non-operating position, a brake wheel supported rotatably with a proper resistance force on a shutter base plate and engageable with the brake operating member slightly before the end of the operation of the shutter blade actuating member and a stopper set on the shutter base plate and engageable with the shutter blade actuating member to stop the shutter blade actuating member so that a braking force may be efficiently applied to the shutter blade actuating member during a slight motion just before the end of the operation of said actuating member and then the braking means may not act as a load when said actuating member is stopped and the shutter is cocked.

Abstract: A rotary indicating device comprising a rotary drum supporting respectively rotatably a plurality of indicating plates, a ring-shaped spring fitted on one side surface of the rotary drum and resiliently pressing the respective rotary shaft portions of the plurality of indicating plates in a direction along the diameter of the rotary drum and a member for turning the plurality of indicating plates in turn with the rotation of the rotary drum so as to be able to be simply assembled and to stably hold the indicating plates in the indicating position.