LENS POSITION DETECTING DEVICE

LENS POSITION DETECTING DEVICE

PURPOSE:To detect the position of a lens without contacting by providing a magnetic pattern part consisting of magnet parts of 1st and 2nd poles and a no-magnetic-force part and a magnetism sensing means which senses a magnetic force from the magnetic pattern part. CONSTITUTION:The magnetic pattern...

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Hauptverfasser: ISAKI MASATAKA, TERASAKA TAKASHI
Format: Patent
Sprache:eng
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BASIC ELECTRIC ELEMENTS
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
SEMICONDUCTOR DEVICES
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creator ISAKI MASATAKA
TERASAKA TAKASHI
description PURPOSE:To detect the position of a lens without contacting by providing a magnetic pattern part consisting of magnet parts of 1st and 2nd poles and a no-magnetic-force part and a magnetism sensing means which senses a magnetic force from the magnetic pattern part. CONSTITUTION:The magnetic pattern parts 16 and 18 are stuck or provided magnetically on the circumferences of a focus ring 11 and a focus ring 12 and magnetism sensing elements 19 and 20 are faced to the magnetic pattern parts at specific intervals and sense the magnetic force from the magnetic pattern parts. Consequently, the position of the lens is detected with low power consumption without contacting, the durability and stability are improved, and the number of components is small; and the assembly is excellent and the size, weight, and cost are reduced.
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subjects BASIC ELECTRIC ELEMENTS
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
SEMICONDUCTOR DEVICES
title LENS POSITION DETECTING DEVICE
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