Lens barrel

Abstract

A lens barrel is provided and includes a barrel main body; lens frames supported by the barrel main body so as to be movable in the direction of an optical axis; a focus ring and a zoom ring which are rotatably supported by the barrel main body and move the lens frames in the direction of the optical axis; and a diaphragm device attached to the barrel main body. The focus ring and the zoom ring come into contact with a rotation regulatory section of the diaphragm device, whereby rotation of the focus ring and rotation of the zoom ring are regulated.

Description

technical field [0001] The invention relates to a lens barrel, in particular to a lens barrel installed in a monitoring camera. Background technique [0002] On the lens barrel of a surveillance camera that manually performs focusing operations or zooming operations, an operation ring such as a focus ring or a zoom ring is rotatably provided on the outer periphery of the lens barrel body. By rotating the operation ring, focusing or zooming is performed. Zooming (for example, refer to Patent Document 1). [0003] A lens barrel having such an operation ring is provided with rotation limiting means for limiting the rotation range of the operation ring. The rotation restricting means is composed of, for example, a rotation restricting pin protruding from the operation ring and a groove of the lens barrel body in which the pin is engaged, and the rotation range of the operation ring is restricted by the pin contacting the end of the groove. Usually, the rotation limiting pin is...

AI Technical Summary

Problems solved by technology

[0005] However, in the conventional lens barrel, when the pin for restricting rotation is screwed into the operation ring, there is a danger that the pin will be fixed in an inclined state.

If the pin is fixed obliquely, the operating angle of the operating ring will not be correct, which will cause a problem of bad influence on focusing or zooming.

[0006] In addition, the conventional lens barrel needs pins or grooves for restricting rotation, so there are problems such as increasing the size of the lens barrel and increasing the cost of the lens barrel.

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