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...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 7444076 | Image device and method for driving optical system An imaging device for picking up an image of an object via an optical system and recording image information in a recording medium, a driving system for the optical system being controlled according to a position of an operating unit, includes a motor driving an obj... | 10/28/2008 |
| 7253575 | Industrial optical shutter A highly versatile optical shutter for industrial and scientific applications is disclosed. The has a aperture which defines a light path through the shutter, and a shutter vane or blade that is moved into and out of the light path using a precision, microprocessor ... | 08/07/2007 |
| 7133603 | Motor driving apparatus, digital camera, and motor controlling method A motor driving apparatus includes a power circuit that controls an output voltage via a feedback resistance. The power circuit varies the output voltage by changing a value of the feedback resistance at a time of at least one of activation and termination of a moto... | 11/07/2006 |
| 7068318 | Diaphragm control apparatus for lens of CCTV camera A diaphragm control apparatus for a lens of a CCTV camera having a diaphragm driver for opening or closing a diaphragm in accordance with a diaphragm control signal, includes a remote diaphragm controller which outputs a remote diaphragm control signal to set an opt... | 06/27/2006 |
| 6924612 | Three-wire reversing system A three-wire reversing system for a permanent magnet, reversible, brush-type, direct current (DC) motor has a three-wire alternating current (AC) input voltage source which supplies electrical current to at least one capacitive element. This capacitive element and t... | 08/02/2005 |
| 6640056 | Camera for driving lens unit removably attached thereto and method for controlling drive therebetween A photographing apparatus suitable for fixing an optical unit thereto, and a method for controlling a device in the unit from the apparatus. The apparatus includes: a unit fixing portion for fixing the unit thereto; a driver which runs the device in the u... | 10/28/2003 |
| 6370334 | Imaging apparatus, a drive mechanism and a method of driving the mechanism A drive mechanism for moving a lens and adjusting a diaphragm by a driving force supplied by a single drive source, comprising: a transmission mechanism capable of taking a first transmitting condition by which the driving force is transmitted for both ad... | 04/09/2002 |
| 6363222 | Automatic exposure control device for a camera A photo diode and a resistor are connected to each other in series. A gate of a FET is connected to the connection of the photo diode and the resistor. When a photometry switch is turned on, the photo diode generates a photo current according to a subject... | 03/26/2002 |
| 6148151 | Control system for an objective of a camera A control system for an objective of the camera, in particular a film camera, includes one or several drive units for automatically positioning at least one lens ring, e.g., for adjusting the focus position, the opening of the iris diaphragm and/or the fo... | 11/14/2000 |
| 5325149 | Camera system with interchangeable lens A camera system with interchangeable lens, consisting of a camera unit and a lens unit detachably mountable on the camera unit, comprising a target value setting circuit for setting a target control value of a diaphragm provided in the lens unit, a correc... | 06/28/1994 |
| 5113210 | Camera with power zoom function and interchangeable lens with power zoom function The present invention provides a camera system comprising: a zoom driving means driven by a battery as a power source, for varying a focal length of a taking lens; other driving means driven from the battery as a power source; a detecting means for detect... | 05/12/1992 |
| 4649431 | Video camera iris control circuit An iris control circuit for a video camera in which only a single drive coil is employed so that the video camera employing the circuit can be more easily miniaturized. A first operational amplifier supplies drive current to a drive coil in proportion to ... | 03/10/1987 |
| 4618239 | Photographic apparatus and measurement method of exposure conditions A photographic apparatus comprises a photoelectric camera arranged movably at the position of the lens of the photographic apparatus and a picture signal processing circuit connected electrically with the photoelectric camera and adapted to process pictur... | 10/21/1986 |
| 4615600 | Camera of the automatic aperture control type A camera of the automatic aperture control type permits stop-down means which operates a diaphragm in cooperation with a shutter release operation first to move forward from a first position corresponding to the open aperture to a second position correspo... | 10/07/1986 |
| 4563070 | Exposure control apparatus An exposure control apparatus including a diaphragm for controlling the exposure on a focal plane, a light metering element for measuring the light passing through an aperture of the diaphragm, a servo control circuit for controlling the size of the apert... | 01/07/1986 |
| 4538893 | Motor driven camera In a camera having a stop drive mechanism adapted to be driven by an electric motor to vary a stop aperture and a film wind-up mechanism adapted to be driven by the electric motor to wind up a film, the electric motor is rotated to drive the stop drive me... | 09/03/1985 |
| 4378146 | Automatic control device for controlling the iris diaphragm in an optical system An automatic control device for controlling the iris diaphragm in an optical system having lens groups therein, comprising an outer casing adapted to be detachably secured to the optical system surrounding the optical system and an iris diaphragm drive me... | 03/29/1983 |
| 4350421 | Camera with a built-in winder A single lens reflex camera has a built-in winder which includes a reciprocating member reciprocatable in response to forward and reverse rotations of a motor for automatic charge-up of the camera mechanisms as well as for automatic film wind-up. A charge... | 09/21/1982 |
| 4322144 | Aperture stop-down confirmation device for camera The present invention relates to an aperture stop-down confirmation device for a camera. So far, in order to carry out the aperture stop-down operation for confirming the depth of focus before photographing in the case of a camera having a mechanical diap... | 03/30/1982 |
| 4134653 | Servoamplifier in an automatic diaphragm controlling device of a camera 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... | 01/16/1979 |
| 4104656 | Control means for a diaphragm of a single lens reflex camera Electronic means for controlling the aperture of an electromagnetically operated diaphragm of a photographic camera, especially a single lens mirror reflex camera. The diaphragm aperture is set by a pot-shaped electromagnet. The coil of the electromagnet ... | 08/01/1978 |
| 4101910 | Automatic diaphragm control system means for preventing energization of the diaphragm adjusting mechanism when the adjusting mechanism is at the limit of its adjusting range A diaphragm-adjusting motor varies the setting of an adjustable diaphragm and includes a drive winding and a damping winding. A negative-feedback control circuit generates a scene-light-dependent error signal and energizes the drive winding of the adjusti... | 07/18/1978 |
| 4074289 | Camera exposure control system adapted to adjust both the diaphragm and the shutter This invention provides for automatically adjusting the diaphragm opening in a camera having a shutter operated in an automatic manner for controlling exposure time, so as to counteract such problems as the exposure time being adjusted to the point within... | 02/14/1978 |
| 4060756 | Automatic iris control means for variable focal length lens system A servo-motor connected with potentiometers to be balanced is used for controlling the diameter of an iris of a lens system of variable focal length. One potentiometer to be used for detecting the position of control is connected with a plurality of chang... | 11/29/1977 |
| 4010480 | Control circuit for automatically controlling a diaphragm of a camera The control circuit for automatically controlling a diaphragm of a camera for the proper exposure has a servomotor coupled with the diaphragm and provided with a pair of coils each for driving a servomotor coupled with the diaphragm in the opposite direct... | 03/01/1977 |
| 4005445 | Automatic exposure control means A diaphragm of a camera is controlled by a servomotor which is actuated with an output of an amplifier. A bridge circuit including a photodetector which receives light from the object to be photographed is connected with the amplifier so that the imbalanc... | 01/25/1977 |
| 3963970 | Control circuit for servo-motors A control circuit for servo-motors comprising a photoelectric element, a logarithmic conversion element, one or more operational amplifier, and a constant-current circuit so that various informaton in a wide range can be easily introduced into the circuit... | 06/15/1976 |
| 3962707 | Camera diaphragm with follow focus control Camera diaphragm control apparatus in which slidable diaphragm blades are adjustable by a differential motor to establish and continually maintain an exposure aperture of size related to ambient scene brightness. A linkage, responsive to mounting a flash ... | 06/08/1976 |
| 3949287 | Position-control servo system with speed-dependent damping action A regulating arrangement comprises a subtracting amplifier having an output and two inputs, and producing at the output a voltage equal to a first factor times the voltage at one of the inputs minus a second factor times the voltage at the other of the in... | 04/06/1976 |
| 3935524 | Circuit arrangement for detecting voltage differences An electronic switching system for the control of a load, such as a motor serving to adjust the diaphragm of a motion-picture camera, comprises a normally inactive comparison circuit including a transistor bridge with a pair of NPN transistors in one pair... | 01/27/1976 |
