摘要:
A drive mechanism for a camera having a lens including a drive member, a motor for driving the drive member in a clockwise and a counterclockwise direction, a range setting device operated by the drive member operable to effect movement of a lens member to a plurality of positions corresponding to a plurality of focused positions of the lens when the drive member is rotated by the motor, an exposure actuation device operable upon actuation to effect exposure operation of the camera, and actuating cams on the drive member for actuating the exposure actuation device as the range setting device maintains a focused position of the lens.
摘要:
Apparatus for performing an automatic focus/exposure operation for a camera includes a drive member driven by a motor, a distance member for driving a lens focusing mechanism during a lens focusing operation in correspondence with movement of the drive member in a first direction, a retaining pawl for engaging the distance member means to prevent reverse movement of the distance member means upon completion of the lens focusing operation, and a blade opening/closing mechanism for opening blades during an exposure operation when the drive member moves in a second direction which is opposite to the first direction of the focusing operation, the blade opening/closing mechanism shifting the exposure operation quickly upon completion of the lens focusing operation.
摘要:
When a driving member is rotated counterclockwise by a single motor with a pair of sectors biased in the closing direction by a biasing spring, a first driving pin causes an operating lever to rotate clockwise. The pair of sectors pivot in opposite directions to each other in association with the driving lever to reach a first position where the sectors are fully open without overlapping the lens opening. When the driving member is rotated clockwise, a second driving pin also causes the operating lever to rotate clockwise. The pair of sectors pivot in opposite directions to each other to reach a second position, that is, a half-open position where an opening smaller than the lens opening is obtained. At this time, The second driving pin abuts on a part of one sector to restrain the displacement of the driving member. Accordingly, the driving member is prevented from overrunning, and no hunting occurs.
摘要:
A lens driving device for controlling the position of a lens setting member according to a distance to an object to be photographed has a lens barrel mounted to undergo movement in the direction of an optical axis, a lens setting member mounted to undergo rotation about the lens barrel and to move the lens barrel in the direction of the optical axis, a biasing spring for applying a biasing force for biasing the lens setting member in one direction, a ratchet engaging with the lens setting member to undergo rotation therewith, a retaining member having a pair of engaging pawls disposed to alternately engage with the ratchet to prevent rotation of the ratchet due to the biasing force of the biasing spring, an electromagnetic actuator for applying a first driving voltage for maintaining the retaining member in an engaged state and a second driving voltage for rocking the retaining member to alternately engage the pawls with the ratchet to cause the biasing spring to rotate the ratchet in a stepwise manner during periods when the ratchet is not engaged by either of the engaging pawls of the retaining member, and a driving ring for driving the lens barrel to return to an initial position by rotating the lens setting member to an initial position against the biasing force of the biasing spring and for performing at least one of an exposure operation and an aperture control operation. In the lens driving device, the first driving voltage of the electromagnetic actuator is lower than the second driving voltage such that a lower voltage is applied when the driving member is rotated and the lens setting member is at rest than when the lens setting member is not at rest.
摘要:
A lens driving device comprises a lens driving member mounted for rotation between an initial position and a preselected focus position, an urging member for urging the lens driving member in a first direction of rotation to control a rotational position of the lens driving member in accordance with the preselected focus position, and a ratchet operably rotatable with the lens driving member. A retaining member is mounted for back and forth rocking movement and has retaining portions for alternate engagement with the ratchet during back and forth rocking movement of the retaining member. A control mechanism controls the rocking movement of the retaining member. A holding member holds the lens driving member from rotation in a second direction of rotation opposite to the first direction of rotation when the lens driving member is in the initial position.
摘要:
A rocking motor comprises a coil wound around a hollow coil bobbin. A rotor is rotatably mounted at a position close to an end portion of the coil bobbin. The rotor has a center shaft and a permanent magnet and is magnetized with two poles such that the positions of the poles are located close to the coil and the magnetization angle is greater than 90 degrees but less than 180 degrees. The positions of the poles of the rotor and the coil are adjacent to one another so that a rotary torque can be efficiently obtained by a magnetic force generated by the coil. The rocking motor can generate a high power output with a relatively low power supply and its operational performance is not adversely affected by an external magnetic field.
摘要:
A lens driving device for a camera or the like drives a lens through a correct distance by the distance through which the lens is driven being corrected according to errors in mechanical parts; as a result it is not necessary for the mechanical parts to be made of high precision, and maintenance of molds used in their manufacture can therefore be made easy.
摘要:
A motor driven shutter is activated by a single motor whose clockwise and counterclockwise rotations may be controlled. The motor driven shutter includes a driving member whose clockwise and counterclockwise rotations are controlled by the motor and having first and second control portions. An opening member is activated by the first control portion; and an opening spring biases the opening member in the direction of opening the shutter. A first electromagnet controls the activation timing of the opening member and resists the bias of the opening spring. A closing member is activated by the second control portion; and a closing spring biases the closing member in the direction of closing the shutter. A second electromagnet constrains the activation timing of the closing member and resists the bias of the closing spring. A selecting circuit selects excitation and demagnetization of the first and second electromagnets, the selecting circuit controlling a plural time excitation or demagnetization of the first and second electromagnets to carry out shutter opening and closing operations by the opening member and the closing member.
摘要:
A motor driven shutter by which various operational modes are freely selectable and photographing timing is shortened includes springs and a motor arranged in a manner freely selectable as driving forces for opening and closing the shutter and are combined or selected corresponding to the operational mode. The photographing timing is shortened by operating in parallel an F number setting operation and a focus adjusting operation. Various modes may be selected according to the photographing purpose, and the photographing timing may be shortened.
摘要:
In the distance measuring device for an automatic focusing camera, the reliability is improved by preventing the device from electric noise, and the structure is simplified so as to provide interchangeability to reduce the production cost. A light receiving lens 2 and a multilayer printed circuit board 3 are mounted on a holder 1. A potting frame 6 is provided on the lens-facing side surface of the printed circuit board 3. An optical sensor 4 and an IC 5 are both mounted within a space 3 enclosed by the potting frame 6, and sealed by a protecting resin 7 simultaneously. Further, resistors S and capacitors C of a distance measuring circuit are mounted on the opposite surface of the printed circuit board 3. Both the surfaces of the printed circuit board 3 are connected to each other via a through hole to construct the distance measuring circuit. The protecting resin 7 transmits light having specified wave lengths. The light reflected from a subject to be photographed is received by the optical sensor 4 after passing through the protecting resin, and a distance to the subject is calculated on the basis of the received light data.