Photography – With power supply detail – Having nonelectrochemical power source
Patent
1995-06-22
1997-05-13
Gray, David M.
Photography
With power supply detail
Having nonelectrochemical power source
G03B 726
Patent
active
056301871
ABSTRACT:
A lens device that is not affected by changes in environmental conditions and is capable of manual and automatic focussing of the lens. Specifically, the lens device generates an appropriate operational load during manual operations of the lens using a simple structure. The lens device includes a lens barrel containing a lens holding barrel holding the lens. The operation ring has the ability to rotate and is fitted around the outer periphery of the lens barrel. The lens drive device includes a motor, a deceleration device, a motor drive circuit, and a variable resistor. The motor has the ability to generate electricity. The selection switch selectively connects the motor to either the motor drive circuit or the variable resistor. During automatic operation, the motor is connected to the motor drive circuit. The motor drive circuit is the power source of and drives the motor. The driven motor rotates the operation ring to adjust the focus through the deceleration device. During manual lens operation, the motor is connected to the variable resistor. Through the deceleration device, electricity is generated because of operation ring rotation. The generated electric power is consumed by the variable resistor and the motor, thereby generating an appropriate operational load. The resistance of the variable resistor can be set through an adjustment knob.
REFERENCES:
patent: 3703132 (1972-11-01), Beach
patent: 4200374 (1980-04-01), Shimizu et al.
Gray David M.
Nikon Corporation
LandOfFree
Lens device and method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Lens device and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lens device and method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1395115