JPS6312329Y2 - - Google Patents

Description

[Detailed description of the invention] The invention consists of a lens barrel for automatic focusing photography;
In particular, the present invention relates to a photographic lens barrel that has both photographing operation modes, manual focusing operation and automatic focusing operation.

Conventionally, photographic lenses that can switch between manual focusing operation and automatic focusing operation have been developed, for example, in Japanese Patent Application Laid-Open No. 57-17927.
It is known by its name etc.

In these conventional photographic lenses, the lens holding tube that holds the focusing lens is helicoid-coupled to a fixed tube.
The lens holding tube is connected to a gear group that rotates by the rotational force of a motor, and a portion of the lens holding tube is exposed from the lens outer tube to serve as an operating section, and the operating section can be held and rotated. The camera is configured to perform a manual focusing operation by moving the lens, and to perform an automatic focusing operation by rotating the lens holding cylinder via a group of gears by supplying power to a motor.

However, this conventional photographic lens has various problems because the lens holding barrel is always connected to the gear group.

For example, if the operation part of the lens holding barrel is made large, it will be easier to operate, but if it is too large, the operation part will hit the hand when holding the photographic lens, which will impede the operability during automatic focusing operation. On the other hand, if the operating section is made smaller, the operability of manual focusing operation becomes difficult.

In addition, since the lens holding tube is rotatably supported relative to the fixed tube, with the above structure, when a large external force is directly applied to the lens holding tube, the support part deforms and the rotation of the lens holding tube is affected. The problem arises that it becomes an obstacle.

In view of the problems of the prior art described above, the present invention provides a protective member to protect the lens operation barrel, and when performing manual focusing operation, insert your finger into the notch provided in the protective member to operate the lens. Focus by rotating the tube, and use the notch to adjust the hood.
The object of the present invention is to provide a lens barrel to which accessories such as a cap can be attached.

Embodiments of the lens barrel according to the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a lens outer cylinder housing an automatic focusing drive mechanism, the front end of which forms a cylindrical part 1', and the cylindrical part 1' has a notch 1a. , 1b, and a circumferential groove 1c is provided on the outer periphery from one end of the notches 1a, 1b. 2 is a mount part for attaching and detaching the camera body;
is a lens operating barrel that holds a photographing lens 4 for focusing, and its front end is connected to the cylindrical portion 1' of the lens outer barrel 1.
is fitted as a protective member and rotatably held within the lens barrel 1, and the photographing lens 4 is moved in a direction parallel to the optical axis relative to the lens barrel 1 manually or by an automatic focusing drive mechanism (not shown). It is now possible to control the feed. Reference numeral 5 denotes a switch provided on the lens barrel 1 to select between manual focusing operation and automatic focusing operation, and during manual focusing operation (M mark), the switch does not energize a known automatic focusing drive circuit (not shown) during manual focusing operation (M mark). Cut off,
During automatic focusing operation (mark A), the automatic focusing drive circuit is turned on.

Reference numeral 6 denotes a lens hood as a camera accessory for blocking light that may be an obstacle during photographing, and is mounted in the notches 1a and 1b provided in the cylindrical portion 1' of the lens outer cylinder 1 on its inner diameter. A pair of protrusions 6a have the same width as the length to be inserted into the groove 1c, and a stopper part 6b is provided protruding from one end of the protrusions 6a.

In this embodiment with the above configuration, when the lens barrel is attached to the camera body and the selector switch 5 is set to the M mark during manual focusing operation, the automatic focusing drive circuit is de-energized and the outer periphery of the lens operating barrel 3 is turned off. A focusing operation can be performed by manually rotating the lens barrel from the notch 1a or 1b of the lens outer cylinder 1.
On the other hand, when the A mark is set during an automatic focusing operation, the automatic focusing drive circuit is turned on, and the focusing operation is performed by its operation.

In addition, when attaching the lens hood 6 to the lens barrel, the protrusion 6a of the lens hood 6 is fitted into the notches 1a and 1b of the cylindrical portion 1' of the lens outer cylinder 1, and the protrusion 6a is rotated so that it engages with the groove 1c, and a stopper portion 6b provided at one end of the protrusion 6a.
are mounted in contact with the ends of the notches 1a and 1b of the lens outer cylinder 1.

As explained above, the present invention uses the cylindrical part provided at the front end of the lens outer cylinder containing the automatic focusing drive mechanism as a protection member for the lens operating cylinder, and prevents direct impact from being applied to the cylinder. The notch provided in the shaped part can be used for manual focusing of the lens holding tube, and can also be used easily and quickly for attaching accessories such as a hood and cap.

[Brief explanation of the drawing]

The figures show an embodiment of the lens barrel according to the present invention; FIG. 1 is a front perspective view thereof, and FIG. 2 is a partially cutaway rear perspective view showing the attachment relationship with accessories. DESCRIPTION OF SYMBOLS 1... Lens outer cylinder, 1'... Cylindrical part serving as a protective member, 1a, 1b... Notch, 1c... Groove, 2...
...Mount, 3...Lens operation barrel, 4...Taking lens for focusing, 5...Switch for automatic or manual focusing operation, 6...Lens hood, 6a...Protrusion.

Claims (1)

[Scope of utility model registration request] An operating barrel for manually rotating a focusing photographing lens driven by an automatic focusing means is rotatably held in a lens barrel fixing part, and the operating barrel is covered on the outer periphery of the operating barrel. A lens outer barrel is provided, a notch is provided in the lens outer barrel for operating the operation barrel from the outside, and a circumferential groove is provided on the outer periphery of the lens outer barrel from one end of the notch for attachment. A lens barrel characterized in that a protrusion formed on the inner diameter of the accessory is configured to engage with the groove, and a stopper provided at one end of the protrusion comes into contact with the notch. .