Abstract: A cursor magnifying glass arrangement has a support body for holding a magnifying glass body having a cylindrical portion and a lens section. The cylindrical portion is rotationally symmetrical with respect to the cylindrical axis and is convexly curved. An evaluation coil is disposed coaxially to the cylindrical portion. The lens body is removably, preferably interconnectedly, supported in the support body, and the evaluation coil is fixed on the support body radially outside of the path of the edge light beam of the lens section.

Abstract: A focus and optical axis adjustment mechanism for a semiconductor laser and a collimator lens is disclosed. A first holding member for holding a semiconductor laser is attached to an intermediate member so that it is movable on a plane vertical to the optical axis of the semiconductor laser. The intermediate member is attached to a second holding member which holds a collimator lens so that it can be bent with a portion near one end thereof as the bending line.

Abstract: A magnifying attachment for a flashlight body includes an eyepiece viewing portion which when rotated to a 90.degree. open position provides for dark field illumination of a gem specimen. The attachment includes a split resilient band which may be easily slipped over the end of the flashlight with the band including a folded back tab terminating in a hook which provides a half bearing into which the rotational axis of the eyepiece viewing portion may be permanently placed and retained on the flashlight. A depression or detent notch is formed on the flashlight body to retain the attachment.

Abstract: An autofocus system for a single-lens-reflex camera system, in which an autofocus operation is executed in cooperation with a camera body and a lens unit mounted to the camera body. The amount of cooperation between the lens unit and camera body is determined by the camera body, and depends upon the performance of the lens unit mounted thereto. Where the lens unit is equipped with a computing means and a lens drive means, the camera body merely detects a defocus amount and sends it to the lens unit so that a focusing operation can be executed by the lens unit itself.

Abstract: A lens frame of the projection lens to be attached, for example, on a projector of a projection-type television comprising a lens barrel for supporting the projection lens, a support member for rotatably supporting the lens barrel so that the lens barrel can be rotated about an optical axis of the projection lens to a prescribed position, and a fixing portion for securing the lens barrel to the support member and for frictionally maintaining the lens barrel in a selected position without displacing the projection lens from the optical axis of the projection lens.

Abstract: Lens barrel (12) has a shoulder (16) therein and a retaining ring to retain lens (20) within the lens barrel. A canted coil spring member (24) is engaged between the retaining ring and lens to resiliently retain the lens in place against thermal cycling, vibration and shock.