Travel-limit circuit having a direct current motor for a lens

Details Travel-limit circuit having a direct current motor for a lens Travel-limit circuit having a direct current motor for a lens

1998-12-22

2000-09-12

Masih, Karen

Electricity: motive power systems

Automatic and/or with time-delay means

Movement, position, or limit-of-travel

318294, 318466, 318280, 318293, 318379, G05B 500

Patent

active

061182427

ABSTRACT:
A travel-limit circuit having a DC motor for a lens by which the endurance of the motor can be improved while at the same reducing the rebound due to the inertia of the moving body at a travel extremity. The travel-limit circuit has a lens motor that drives, e.g., zoom lens groups. Limits which detect whether the lens group has reached their travel extremities at which mechanical stoppers are provided. The motor driving circuit, which drives the lens motor and the limit switches, activates a short break by short circuiting the pair of input terminals on the lens motor via diodes while cutting current flow from the motor driving circuit for the lens motor upon detection that the lens groups have reached their travel limit.

REFERENCES:
patent: 4319171 (1982-03-01), Motoori
patent: 4977457 (1990-12-01), Tamekuni et al.
PAJ Abstract and JP 570079925 (Canon).
PAJ Abstract and JP 010087982 (Matsushita.

Affiliated with

Also associated with

Rating

Travel-limit circuit having a direct current motor for a lens does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Travel-limit circuit having a direct current motor for a lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Travel-limit circuit having a direct current motor for a lens will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-98904