Title:
【発明の名称】撮像装置
Document Type and Number:
Japanese Patent JP3038874
Kind Code:
B2
Abstract:
A mechanism for detecting a rotation amount of a diaphragm (3,3) for use in an optical system, such as a camera, including an actuator (6) mounted on a cover plate (8) secured on a base plate (2) in the optical system, diaphragm blades (3,3) pivotally mounted on the base plate (2), and a rotating ring (5) supported by the diaphragm blades (3,3). When the actuator (6) is energized, the rotating ring (5) is rotated so that the diaphragm blades (3,3) are rotatingly moved to open or close a center opening (2a) of the base plate (2). The mechanism includes a magnet (10) with a magnetic gradient fixed on an outer periphery of the rotating ring (5) and a magnetic leakage flux detecting means (11) secured in the cover plate (8) so as to be disposed opposite the magnet (10) and spaced at a given clearance apart therefrom. When the rotating ring (5) is rotated by the actuator (6), the magnet (10) passes over the magnetic leakage flux detecting means (11). The detecting means (11) detects change in an amount of magnetic leakage flux generated from the magnet (10) so that a rotation amount of the diaphragm blade (3,3) is determined.
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Inventors:
Hiroshi Kawamura
Masato Tsujinaka
Masato Tsujinaka
Application Number:
JP27684990A
Publication Date:
May 08, 2000
Filing Date:
October 16, 1990
Export Citation:
Assignee:
ソニー株式会社
International Classes:
G01B7/00; G01D5/18; G03B9/02; G01B7/30; G03B9/06; (IPC1-7): G01D5/18; G01B7/30; G03B9/02
Domestic Patent References:
| JP242372A | ||||
| JP649302A | ||||
| JP57212600A | ||||
| JP6031005A | ||||
| JP63204237A | ||||
| JP57102804U | ||||
| JP61195407U | ||||
| JP6363049B2 | ||||
| JP409468B1 | ||||
| JP4011464B1 | ||||
| JP5117885Y2 |
Attorney, Agent or Firm:
Fujiya Shiga (1 person outside)