DRIVE TRANSMISSION DEVICE, LENS BARREL, PHOTOGRAPHIC OPTICAL APPARATUS, CAMERA AND PERSONAL DIGITAL ASSISTANT

• Main Author: FUNO KATSUHIKO
• Format: Patent
• Language: English
• Published: 20.11.2008
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

PROBLEM TO BE SOLVED: To provide a drive transmission device for use in driving a lens barrel by extending, retracting and housing a lens group at one configuration and by sending out the lens group to a predetermined position for use at the other configuration; to provide a compact thin lens barrel that uses the drive transmission device for driving a zoom lens particularly capable of relatively moving a plurality of lens groups and changing a focal length; and to provide a camera and a personal digital assistant. SOLUTION: The drive transmission device is used for driving a moving part in a photographic optical apparatus, from an extension and retraction state for extending and retracting at least a portion of the plurality of lens groups 21, 22, 23, 24 to house the lens groups, to a photography state by moving at least a portion of the plurality of lens groups 21, 22, 23, 24 to the object side. The device includes an actuator 41 and gear mechanisms 42-49, wherein the gear 42 arranged in the actuator 41 and the gear 43 to be engaged with the gear 42 are spur gears. At least two axis right-angle conversion mechanisms are arranged for the gear connection after the spur gears, and the actuator 41 is arranged in parallel with an optical axis of lens of the lens group. COPYRIGHT: (C)2009,JPO&INPIT