Patent ID: 8760778

Claim:
A rear-focus-type lens device comprising: an attachment frame that is provided on the rear side of a lens barrel body; and an internal structure that includes a focus lens and is provided in the attachment frame, wherein the attachment frame includes: an inner wall that is provided inside the attachment frame and partitions the inside of the attachment frame into a first space which accommodates the internal structure and a second space which accommodates a switch assembly including a plurality of switches for operating the lens device, and the plurality of switches are arranged in a circumferential direction of the attachment frame; an opening of the second space which is formed in the side surface of the attachment frame and to which the switch assembly is attached; and a cover to which the switch assembly including the plurality of switches are attached, the cover covering the opening of the second space, wherein the inner wall is opposed to the opening, and wherein the strength of the attachment frame is reinforced by the inner wall, and wherein the internal structure includes: the focus lens, a focus lens driving unit that drives the focus lens in the optical axis direction, a lens position detecting unit that detects the position of the focus lens, and a holding frame having the focus lens, the focus lens driving unit, and the lens position detecting unit provided therein, wherein the holding frame is provided with a first guide shaft, which is a standard for guiding a focus lens frame holding the focus lens so as to be movable in the optical axis direction, and a second guide shaft for regulating rotation, the lens position detecting unit is provided at a position where it faces the focus lens with the first guide shaft interposed therebetween, and a pair of the focus lens driving units is arranged at a position to be symmetric with respect to the first guide shaft, and wherein lead line outlets are formed in a portion of the outer circumferential surface of the attachment frame close to the first guide shaft, and each of the switches in the switch assembly attached to the attachment frame is electrically connected to a driving portion that is provided outside the lens barrel body through a flexible printed circuit board, a first connector mounted on the flexible printed circuit board, a second connector connected to the first connector, and a plurality of lead lines which is connected to the second connector and is drawn out from the lead line outlets.