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Title:
LIGHT QUANTITY CONTROLLER
Document Type and Number:
Japanese Patent JP2010085774
Kind Code:
A
Abstract:

To provide a light quantity controller which is constituted of a small number of parts, is easily assembled, satisfactorily rocks a light shielding blade, is made low in height in an optical axis direction, and improves efficiency of an electromechanical conversion element.

The light shielding blade 20 provided to a base plate 10 is rocked by a light shielding blade rocking means 30 so as to control the quantity of diaphragm passing light through a first light quantity control hole 13 by the light shielding blade 20. The light shielding blade rocking means 30 includes: a driving member 31; a frictional engaging member 32 which supports the driving member 31 in a frictional engaging state; the electromechanical conversion element 33 whose one end face is stuck to the end face of the driving member 31; a head to be driven 34 which is stuck to the other end face of the electromechanical conversion element 33; and a driving pin 35 which is provided integrally with the head to be driven 34 and coupled to the light shielding blade 20, on the outside of the base plate 10. The cross-sectional shape of the electromechanical conversion element 33 in a direction perpendicular to an elongation/contraction direction is constituted so that a direction along the base plate 10 can be a long side and a side perpendicular to the base plate 10 can be a short side.


Inventors:
WAKAYAMA TOMIHIRO
KATAGIRI CHIHARU
Application Number:
JP2008255597A
Publication Date:
April 15, 2010
Filing Date:
September 30, 2008
Export Citation:
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Assignee:
NIDEC COPAL CORP
International Classes:
G03B9/02
Attorney, Agent or Firm:
Eichi International Patent Office