摘要:
An inner barrel includes a male helicoid, and an outer barrel includes a female helicoid which can engage with the male helicoid of the inner barrel. The included angle of trapezoidal threads of the male helicoid are identical to an included angle of trapezoidal grooves of the female helicoid in a section perpendicular to a direction of an extension of the threads.
摘要:
A zoom lens barrel includes a stationary barrel; a first rotational feed barrel which is engaged with the stationary barrel by means of helicoids; a first linear movement barrel which is engaged with the first rotational feed barrel so as to relatively rotate and to relatively move together along the optical axis and which is provided on the inner peripheral surface thereof with a female helicoid; a second rotational feed barrel which has a male helicoid and a female helicoid on the outer and inner peripheral surfaces thereof respectively; a rotational transmission barrel which is engaged with the first rotational feed barrel so as to relatively move along the optical axis and to rotate together, and which is integrally connected to the second rotational feed barrel; a second linear movement barrel which is provided on outer peripheral surface thereof with a male helicoid which engages with the female helicoid of the second rotational feed barrel; a lens group that is held by said second rotational feed barrel; and at least one lens group which is guided to linearly move independently of the second linear movement barrel.
摘要:
An encoder for detecting a forward/reverse movement of a rotatable object includes a rotating shaft that is supported on a base and rotates in accordance with the movement of the subject, two rotating disks fixed to the rotating shaft, and two photocouplers mounted on the base which are associated with the disks. Each of said rotating disks is formed with a predetermined light modulating pattern to vary the intensity of light along a circumferential direction. Each of the photocouplers emits a light toward the rotating disk and detects the light modulated by the pattern on the rotating disk. The angular relationship between the rotating disks is selected such that the output signals from the photocouplers due to the rotation of the rotating shaft have a predetermined phase difference.
摘要:
A method for producing a male helicoid molding die which is adapted to manufacture an inner barrel having a male helicoid, and for producing a female helicoid molding die which is adapted to manufacture an outer barrel having a female helicoid which can engage with said male helicoid of the inner barrel. The method includes the steps of firstly, setting an included angle of trapezoidal threads of the male helicoid to be identical to an included angle of trapezoidal grooves of the female helicoid in a section perpendicular to a direction of an extension of the threads and preparing a cutting tool having an angle identical to the set angle. Secondly, the male helicoid molding die is machined to form a helicoid portion thereof using the cutting tool. Next, an electric spark machining electrode is prepared having a helicoid portion whose shape is identical to a shape of the helicoid portion of the male helicoid molding die, by a mechanical cutting operation, using the cutting tool. Then a helicoid portion of the female helicoid molding die is formed by electric spark machining using the electric spark machining electrode.
摘要:
The exposure controlling device comprises a controlling unit that controls, at the time of an exposure, the DC motor to rotate forward to open the shutter blades and then to rotate reversely to close the shutter blades, a calculating unit that calculates a time period for driving the DC motor in the forward direction between a predetermined starting point and a point where a required aperture area is obtained, a timer for counting the time period from the starting point, a memory for storing data of relationship between the time period and the aperture area, and means for storing an individual data of the relationship into the memory. The calculating unit calculates the time period based on a required aperture area by using the data of relationship stored in the memory for compensating individual differences among lens shutters.
摘要:
A lens barrel is disclosed that includes a rotational barrel driven to rotate about an optical axis of the lens barrel. The rotational barrel has a plurality of guide grooves formed on an inner periphery thereof. The lens barrel further includes a linear moving barrel guided along the optical axis without rotating about the optical axis, a unit secured inside the linear moving barrel, and a plurality of follower pins securing the unit to the linear moving barrel. The plurality of follower pins each project outwardly from an outer periphery of the linear moving barrel to engage with the plurality of guide grooves, respectively, so that the linear moving barrel is moved along the optical axis relative to the rotational barrel when the rotational barrel is driven to rotate.
摘要:
A zoom lens barrel includes a through groove which is provided on a first cylindrical member; a radial projection provided on a second cylindrical member; and a roller which is supported by the radial projection and is fitted in the through groove. The through groove has an opening width on the inner diameter of the first cylindrical member which is greater than the opening width on the outer diameter thereof. The roller is provided with an slip-off prevention portion whose diameter is greater than the opening width of the through groove on the outer diameter of the first cylindrical member, but smaller than the opening width on the inner diameter. The through groove is provided with a large width portion at which the roller is fitted into, so that the slip-off prevention portion is located in the through groove.
摘要:
A multi-stage extension type zoom lens barrel includes a first rotational feed barrel rotatably connected to a stationary barrel; a first linear movement barrel disposed in, and rotatably connected to, the first rotational feed barrel without relatively moving in the optical axis direction; a second rotational feed barrel disposed in, and rotatably connected to, the first linear movement barrel so as to move in the optical axis direction relative to the first linear movement barrel upon rotating; a rotation transmission barrel which can be detachably inserted between the first rotational feed barrel and the first linear movement barrel from the front thereof; a rotation transmission groove and a projection which connects the rotation transmission barrel and the first rotational feed barrel so as to relatively move in the optical axis direction without relatively rotating; connection members provided at the front ends of the rotation transmission barrel and the second rotational feed barrel; and a connection holding decoration ring detachably attached to the front ends of the second rotational feed barrel and the rotation transmission barrel via a predetermined amount of deformation, so as to hold the connection of the barrels.
摘要:
A position detection system detects a position of a lens of a camera using a code plate provided with a plurality of electrodes arranged to form a plurality of patterns. The ends of the electrodes are respectively connected to a connecting point of a plurality of resistors connected in series, and a predetermined voltage is applied across the resistors. A conductive brush is provided such that, depending on the position of the lens, two of the electrodes are electrically connected by the brush, which short-circuits at least one of the plurality of resistors. Be detecting voltage at one of the connecting points of the resistors, which varies depending upon which resistor is short-circuited, the lens position is determined.
摘要:
A flexible printed circuit board is disclosed having a predetermined circuit pattern printed thereon. The flexible printed circuit board is bent at a predetermined location. The flexible printed circuit board includes a covered portion at which a part of the printed circuit pattern is covered by a covering layer, and an uncovered portion at which another part of the printed circuit pattern is not covered by the covering layer. The covered and uncovered portions are formed on the flexible printed circuit board. A border of the covering layer that is located adjacent to the uncovered portion on the flexible printed circuit board is positioned in the vicinity of the bent portion and is formed to be longer than a possible minimum length of the border.