Class 396/256 - Stepping motor

Subclass of Class 396 - Photography
Definition: Subject matter in which the exposure control circuit drives
No. of patents: 23
Last issue date: 08/07/2007

Number	Title	Issue Date
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
6917127	Outer stator for linear compressor motors An outer stator of a motor is mounted in a linear compressor for compressing a coolant gas. The outer stator comprises a coil assembly having a coil wound on a bobbin with flange parts and a plurality of core blocks that surround the coil assembly. The flange parts ...	07/12/2005
5953062	Exposure control device for optical apparatus An optical apparatus includes a light quantity adjusting member arranged to vary a quantity of light when the member is moved, a stepping motor arranged to drive the light quantity adjusting member, a luminance detecting part for detecting the luminance o...	09/14/1999
5315344	Microscope camera Photographic apparatus having both automatic and manual modes of operation is adapted for coupling to a microscope. the apparatus includes a viewfinder for viewing a scene in the microscope and an exposure controlling photometer for measuring the scene br...	05/24/1994
5111230	Lens shutter driving mechanism using lens driving mechanism A main driving member coupled with a stepping motor is advanced or returned by normal and reverse rotation of the stepping motor. When the main driving member is advanced, a lens driving member follows the main driving member to be advanced to a focused p...	05/05/1992
5109250	Program shutter A program shutter for automatic exposure control including a forwardly/reversibly rotatable step motor for opening and closing a shutter to effect automatic exposure in the control circuit for controlling the operation of the step motor. The control circu...	04/28/1992
5060000	Motor-driven shutter for camera A drive ring drivable by a stepping motor is normally urged by a spring to turn in one direction around a lens aperture. When not in use, the stepping motor is not subjected to the resilient force from the spring since the drive ring is locked against rot...	10/22/1991
5047796	Automatic focusing device for camera An automatic focusing device for a camera having a lens, includes a camera lens focusing mechanism which adjusts the focus of the lens and which includes a rotatable driving ring, a coaxially mounted rotatable range ring and a spring which moves the range...	09/10/1991
5040017	Shutter apparatus having two blade members pivoted about one point A shutter mechanism, employed in a camera, is provided having a pair of blade members pivoted about a point. The blade members are moved between a position where the light path is completely shielded and another position where light is allowed to pass thr...	08/13/1991
5006880	Programmable shutter A programmable shutter of the type wherein a shutter blade is opened and closed by means of a stepping motor. The motor is rotated in a forward direction by drive pulses of a predetermined fixed period to gradually open a sector while at the same time a l...	04/09/1991
4978991	Open-loop stepper motor controlled shutter An exposure control system for a camera having a scanning type shutter mechanism for forming a range of aperture areas through which a photographic image is formed includes a stepper motor and a regulator or open loop control system therefor, to actuate t...	12/18/1990
4864347	Program shutter A program shutter has a plurality of shutter sectors driven in opening and closing directions by a reversible stepping motor to define a lens aperture during an exposure operation. An arithmetic circuit calculates an exposure amount corresponding to the b...	09/05/1989
4864346	Program shutter There is disclosed a program shutter for use in a camera. The program shutter consists of a shutter mechanism and a control portion. The shutter mechanism has sectors for defining an opening and a stepper motor for driving the sectors. The control portion...	09/05/1989
4751445	Stepping motor control device A stepping motor control device is provided with a current control circuit by which the levels of currents of different driving power sources arranged to drive a stepping motor are virtually continuously changed, so that the motor can be controlled at int...	06/14/1988
4720726	Shutter driving apparatus A shutter driving apparatus drives a programmed shutter with a stepping motor, by using a driving current pulse whose waveform has a leading half that gradually increases in amplitude and a trailing half having an amplitude smaller than the peak value of ...	01/19/1988
4697908	Program shutter A program shutter has a shutter mechanism comprised of at least one sector movable in opening and closing directions in response to forward and reverse rotation of a step motor to form a lens aperture. A control unit automatically controls the shutter ope...	10/06/1987
4696560	Camera shutter In a program shutter having a sector which is opened and closed by a step motor, there is provided a home position detection means for detecting whether or not the sector is positioned in a home position. Before and after an exposure operation, it is dete...	09/29/1987
4693583	Programmable shutter A programmable shutter of the type wherein a shutter blade is opened and closed by means of a stepping motor. The motor is rotated in a forward direction by drive pulses of a predetermined fixed period to gradually open a sector while at the same time a l...	09/15/1987
4648701	Control circuit for program shutter In a program shutter including a forwardly/reversely rotatable step motor for opening and closing a shutter blade to effect automatic exposure, a drive pulse number and an interpolation quantity are set in first and second counters. A step drive pulse is ...	03/10/1987
4634254	Electromagnetically actuated shutter for a camera An electromagnetically actuated shutter for a camera wherein automatic focusing and exposing operation are controlled by means of a single reversible stepping motor....	01/06/1987
4626094	Shutter time switching device for rotary shutter The disclosed shutter time switching device for a rotary shutter is provided with a stepping motor for controlling the opening angle of the rotary shutter. The device includes a driving mechanism for driving the stepping motor in a two-phase driving mode ...	12/02/1986
4265530	Shutter blade drive system Photographic apparatus for controlling the opening and closing of a photographic shutter. In a preferred embodiment, the apparatus includes a linear motor having a first output for incrementally driving the blades of the shutter from a closed orientation ...	05/05/1981
4017872	Shutter for camera The invention discloses a shutter for a camera of the type comprising a light control mechanism which comprises a plurality of shutter blades, which may also function as the aperture control diaphragm, and driving means such as a stepping motor for interm...	04/12/1977

PatentStorm

Quotables

PatentStorm News

Class 396/256 - Stepping motor