Ricoh Company, Ltd.

Ricoh Imaging Company, Ltd.

Daisuke Terahara

Takehide Ohno

Terunori Koyama

An optical device includes an optical system including a plurality of lens groups, at least one lens group being a movable lens group moving in an optical axis direction, and a movable frame to move the movable lens group. The movable frame includes a driving source, a drive screw, a lens supporting frame, and maintaining an integrated state relative to the movable lens group, a plurality of arms disposed in a position to face the drive screw and being openable and closable relative to the drive screw with a single opening and closing axis as a support axis, the plurality of arms including a first arm and a second arm, and a biasing spring configured to apply a biasing force to the first arm in a direction in which the first arm approaches the drive screw, wherein the lens supporting frame is further configured to support the biasing spring.

Lead screw device, lens driver, lens barrel, and camera using the lead screw device

A lead screw device includes a lead screw including a thread portion, and a driven body which engages with the thread portion, and moves in an axis direction of the lead screw along with rotation of the lead screw about an axis, the driven body including a pair of driven members disposed to sandwich the lead screw in a radial direction, wherein the pair of driven members is biased in a direction which sandwiches the lead screw in the radial direction, and a tooth portion provided in each of the driven members engages with the thread portion of the lead screw by a biasing force.

A lens barrel includes a lens group having at least two lenses, a lens holding frame configured to hold the lens group, a holding cylinder configured to hold the lens holding frame movably in an optical axis direction of the lens group, a forward-backward moving mechanism configured to move the lens holding frame forward and backward with respect to the holding cylinder, first to third guide shafts fixed on the holding cylinder so as to surround the lens holding frame and each extend in the optical axis direction, and a biasing mechanism configured to be held by the lens holding frame between the first guide shaft and the lens holding frame and bias the lens holding frame in a direction so as to separate the lens holding frame from the first guide shaft toward the second and third guide shafts on a plane orthogonal to the optical axis direction.

Lens barrel

A lens barrel includes a lens group including a fixed lens including one or more lenses and an adjustment lens including one or more lenses, and a lens frame to hold the lens group, including an adjustment lens frame to hold the adjustment lens and an aligning mechanism to hold the adjustment lens frame movably in a direction orthogonal to an optical axis of the lens group relative to the lens frame.

A lens barrel includes a plurality of lens groups including first and second lens groups positioned closer to an imaging plane than the first lens group, a plurality of lens group frames including first and second lens group frames holding the first and second lens groups, respectively, a rotary cylinder to engage with the first lens group frame via a cam groove, surround the first lens group frame and be rotated around an optical axis to move the first lens group in the optical axis direction, a rotation transmission system to transmit a rotary force of the rotary cylinder, and a second frame driver provided inside of the first lens group frame and engaging with the second lens group frame via a cam groove to move the second lens group in the optical axis direction by the rotary force of the rotary cylinder transmitted via the rotation transmission system.

Lens barrel and imaging device and hand-held data terminal device including the same

A lens driver unit includes a plurality of lens groups including a first lens group and a second lens group, a first lens frame with first and second engaging portions, a second lens frame with a third engaging portion to engage with the first engaging portion, a lens barrel, a first guide element, a second guide element, at least one third guide element, an engaging element, and a drive unit. In an imaging position in which all of the lens groups including the first and second lens groups are placed on an optical axis, the first lens frame is integrally moved with the second lens frame along the optical axis by engagement of the first and third engaging portions while in a contained position, the first lens frame is rotated in a predetermined direction to retreat the first lens group outside an inner diameter of the lens barrel.

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Yokohama, Japan

Daisuke Terahara