Patent Number: 6,512,542

Title: TV lens drive unit having a mechanism for designating a constant zoom rate

Abstract: When a constant rate switch is pressed during the operation of a seesaw switch, an output voltage of a potentiometer in the seesaw switch is stored in a condenser and a command from the seesaw switch is invalidated. The output voltage of the potentiometer when the constant switch is operated is input to an operational amplifier, and a zoom drive motor is run at a constant rate to maintain the zoom rate which has been controlled by the seesaw switch. There may be provided a function which reduces the rate in proximity to the telephoto end or the wide end, and the constant switch may also serve as another switch means such as a return switch.

Inventors: Kaneko; Keiji (Saitama, JP), Takemae; Hisao (Saitama, JP)

Assignee: Fuji Photo Optical Co., Ltd.

International Classification: G02B 7/10 (20060101); G03B 013/00 (); H04N 005/262 ()

Expiration Date: 01/28/2020