JPH11119077A - Zoom lens barrel - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To always store the numerical value of the shortest shooting distance in a macro shooting range described in an instruction manual. A zoom lens barrel that performs zooming by operating a zoom ring on which a focal length scale is displayed, and displays a shortest distance scale corresponding to the focal length scale of the zoom ring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a zoom lens barrel in which the shortest photographable photographing distance changes by zooming.

[0002]

2. Description of the Related Art A conventional zoom lens barrel is configured such that the focal length changes in response to zooming. In general, the shortest photographing distance at which photographing is possible is set to be constant. Normally, the shortest shooting distance is set with priority given to the long focal length side, so that a relatively long distance is set.

In recent years, there has been proposed a zoom lens barrel in which the setting of the shortest photographing distance on the long focal length side is changed to set the shortest photographing distance on the short focal length side. In the lens barrel, since the shortest focusing distance is set on the short focal length side, not only the focal length changes due to zooming, but also the shortest shooting distance changes at the same time. In other words, the zoom lens barrel is of a varifocal type (a configuration in which the set photographing distance changes due to zooming, and in particular, changes at a close distance). Therefore, the distance scale displayed on the conventional distance ring can be used in common at both the long focus side and the short focus side at a predetermined distance, but from a specific distance, a line is displayed instead of a numerical display. Macro display. The meaning of the macro display is that the shortest shooting distance in the macro shooting range is described numerically in the instruction manual of the product.

[0004]

In the prior art as described above, it is troublesome that the numerical value of the shortest photographing distance in the macro photographing range described in the instruction manual must always be stored. There was a problem. Also, if you accidentally forget the value of the shortest shooting distance, you will have to set the distance depending on the feeling, so you must shoot without guaranteeing that a suitable shot image will be obtained There is the problem of not being able to do so.

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and has as its object to eliminate the necessity of storing the value of the shortest photographing distance in a macro photographing range, and to provide a suitable photographed image. The object of the present invention is to provide a zoom lens barrel capable of obtaining the above.

[0006]

In order to achieve the above object, according to the present invention, zooming is performed by operating a zoom ring on which a focal length scale is displayed, and the shortest photographable distance changes according to the focal length. A first object of the present invention is to display a shortest distance scale corresponding to the focal length scale of the zoom ring in the lens barrel.

A second means for solving the above problem is that the shortest distance scale is numerically displayed in a predetermined position range of the short focus and displayed in a circumferential line in a range exceeding the predetermined position range. Things.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external top view of a zoom lens barrel showing an embodiment of the present invention. In FIG. 1, a zoom ring 1 is fitted around the outer periphery of a fixed barrel 3, which is the main body of the zoom lens barrel L, so as to be rotatable around the optical axis. On the outer peripheral surface of the zoom ring 1, a focal length scale 1a (28, 35,
50, 70, 85, 135, 200,) are sequentially printed in the circumferential direction. On the same outer peripheral surface adjacent to the focal length scale 1a, the shortest shooting distance scale 1b (0.85
1.2, 1.5,) are sequentially printed in the circumferential direction similarly to the focal length scale 1a. Minimum focusing distance scale 1b
The line 1c in the circumferential direction, which is continuously printed from, indicates that the content is the same as the presented minimum distance scale 1.5.

The focal length scale 1a and the shortest shooting distance scale 1b
Are related and correspond as follows. That is, the shortest shooting distance at a focal length of 28 mm is 0.85 m, the shortest shooting distance at a focal length of 35 mm is 1.2 m, and the focal length is 50 mm.
The minimum shooting distance for 1.5 mm is 1.5 m, and the minimum shooting distance for focal lengths between 50 mm and 200 mm is the minimum shooting distance scale 1b.
The minimum photographing distance is 1.5 m as shown by the line 1c printed continuously.

The fixed cylinder 3 is provided with an index 3a for reading the distance scale 1a, and the index 3a also serves as an index for distance scales 2a and 2b to be described later. At a position sandwiching the fixed barrel 3 with respect to the zoom ring 1, a focus ring 2 is fitted on the outer periphery of the fixed barrel 3, and is disposed rotatably around the optical axis. On the outer peripheral surface of the focus ring 2, a distance scale 2a and a line 2b indicating a varifocal range are printed.

In the range of the distance scale 2a, the distance scale 2
When a is in the range from infinity to 2 m, each focal length is accurately displayed as a numerical value. However, the portion of the line 2b indicating the varifocal range indicates the varifocal range. Is the part where the distance scale is not accurately displayed. In this part, the shooting distance is a range that cannot be simply described.

However, as described above, the focal length scale 1a (28, 35, 50, 70, 8) is provided on the outer peripheral surface of the zoom ring 1.
5,135,200,) are sequentially printed in the circumferential direction, and on the same outer peripheral surface adjacent to the focal length scale 1a, the shortest shooting distance scale 1b (0.85, 1.2, 1..
5,) are printed in the circumferential direction in correspondence with the focal length scale 1a. In addition, since the circumferential line 1c continuously printed from the shortest distance scale 1b indicates that the content is the same as the presented shortest distance scale 1.5, it corresponds to each focal length. The shortest shooting distance can be instantly read from the corresponding relationship.

[0013]

As described above, according to the present invention, in a zoom lens barrel in which zooming is performed by operating a zoom ring on which a focal length scale is displayed, and a shortest photographable distance changes according to the focal length, Since the shortest distance scale is displayed in correspondence with the focal length scale of the zoom ring, the shortest shooting distance corresponding to each focal length can be instantly read.

Therefore, there is no need to store the numerical value of the shortest photographing distance in the macro photographing range, and an advantageous effect is obtained that a suitable photographed image can be obtained.

[Brief description of the drawings]

FIG. 1 is a top view of a zoom lens barrel showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Zoom ring 1a Focal length scale 1b Minimum focusing distance scale 1c line 2 Focus ring 2a Distance scale 2b line 3 Fixed cylinder 3a Index

Claims (2)

[Claims] 1. A zoom lens barrel in which zooming is performed by operating a zoom ring on which a focal length scale is displayed and a shortest photographable distance changes according to the focal length, wherein the zoom ring corresponds to the focal length scale. A zoom lens barrel characterized by displaying the shortest distance scale. 2. The shortest distance scale is numerically displayed in a predetermined position range of a short focus, and is displayed as a circumferential line in a range exceeding the predetermined position range.
The zoom lens barrel described.