Signal transmission device in an intermediate lens barrel
AssigneeNippon Kogaku K.K.
InventorsKunihiro Fukino, Yukio Saito, Yoshiharu Shiokama
Life of this patent
Estimating the term…
Abstract
Signal transmission device in an intermediate lens barrel comprises a signal surface, a first inclined surface and a second inclined surface. When the intermediate lens barrel is connected to an objective lens, the signal surface gets in engagement with a signal member on the objective lens barrel and is shifted in the direction of the optical axis. When the intermediate lens barrel is rotated to connect it to a camera, a signal detection member on the camera is guided to the signal surface by the first inclined surface. The second inclined surface guides the detection member to a reference surface on the intermediate lens barrel when the latter is rotated in the direction to disconnect the barrel from the camera.
Claims4
In an intermediate lens barrel to be connected between an objective lens and a camera and provided with a device for transmitting an information signal given by signal means provided on said objective lens to detection means provided on said camera movably in the direction of the optical axis, said signal means being so formed as to represent the information signal as a certain determined amount of displacement in the direction of the optical axis and said intermediate lens barrel including a reference surface rotatable together with said signal transmission device relative to said camera in a determined rotational direction and also in the reverse rotational direction about the optical axis to connect the intermediate lens barrel with said camera and disconnect said barrel from said camera, an improvement in said transmission device comprising:
- (a) movable means including a signal surface which shifts in the direction of the optical axis during the connection of said intermediate lens barrel to said objective lens depending on said determined displacement of said signal means resulting from the connection between said movable means and signal means, and a first inclined surface contiguous to said signal surface and inclined in the direction of the optical axis for guiding said detection means to said signal surface with the rotation for connection;
- and
- (b) a second inclined surface contiguous to said reference surface and disposed adjacent to said first inclined surface for guiding said detection means onto said reference surface with the rotation for disconnection.
Dependencies are inferred from the claim text.