摘要:
A zoom lens comprising, in order from an object side to an image side, a first lens unit of a positive refractive power, a second lens unit of a negative refractive power, a third lens unit of a positive refractive power, and a fourth lens unit of a positive refractive power. In zooming, the first lens unit is configured fixed and the second, third, and fourth lens units are configured movable. The following conditions are satisfied where f3st is a movement amount of the third lens unit associated with zooming from a wide angle end to a telephoto end, f3 is a focal length of the third lens unit, β2w is a lateral magnification of the second lens unit at the wide angle end, and z is a zoom ratio, 0.010
摘要:
According to an aspect, an electronic device includes a display unit, and a control unit. The display unit displays information. The control unit determines a scrolling speed of the information in accordance with a speed of an operation, and changes a display size of the information to be scrolled on the display unit in accordance with the scrolling speed.
摘要:
A small zoom lens having a high zoom ratio and high optical performance over an entire zoom range is obtained. The zoom lens includes, in order from an object side to an image side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a positive refractive power; a fourth lens unit having a negative refractive power; and a fifth lens unit having a positive refractive power, wherein intervals between the first lens unit, the second lens unit, the third lens unit, the fourth lens unit, and the fifth lens unit are changed during zooming, in which a focal length (fw) of an entire system at a wide angle end and a focal length (fn) of an n-th lens unit are set appropriately.
摘要:
A laminated core punching apparatus, configured such that a stator-punching press machine that has a molding die performing a partial punching gradually approaches the shape of the stator core piece. There is a punching die to punching out the stator core piece from a strip-form steel plate, and two stator lamination stations. A rotor-punching press machine and a stator-punching press machine are constructed to operate synchronously. An intermediate loop portion capable of causing a strip-form steel plate to hang down in a loop is provided in order to adjust a length of the strip-form steel plate between the two press machines, and a loop guide portion that guides a loop locus of the strip-form steel plate from above so that the strip-form steel plate does not invert is disposed above the intermediate loop portion to be capable of ascending and descending.