Back to results
US 4,060,010 AGranted
Reduction gear, especially for camera lens motors
OwnerBjorn Harald Hedeninventor
Life of this patent
Estimating the term…
Abstract
A camera lens drive comprises a small electric motor and a transmission for driving a lens part. The transmission is formed solely by a number of planetary gear sets arranged in series. The planetary gears are ball bearings having adjustable prestressing. The prestress of a group of input sets is adjustable independently of the prestress of a group of output sets.
Claims6
A transmission for a camera lens motor, comprising
- a. a transmission housing;
- b. a motor adjacent to the housing;
- c. an input shaft driven by the motor;
- d. an output shaft for driving a lens part;
- e. a reduction gear means between the input and output shafts;
- f. the reduction gear means comprising at least two friction planetary gear sets arranged axially in series, and divided into first and second groups;
- the first said group being arranged on the transmission input side and the second said group on the transmission output side, each of said groups comprising at least one planetary gear set;
- h. variable slip clutch means associated with at least one planetary gear set of said second group and with said output shaft for setting a predetermined maximum torque on said output shaft;
- and
- i. separate means associated with a planetary gear set of said first group and with said input shaft for setting a predetermined maximum torque on said input shaft, whereby pre-stressing of each of said first and second groups is independently adjustable.
7 more elements
Dependencies are inferred from the claim text.