JPH10206715A - Lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately perform reading and positioning without spoiling the readableness of a scale by providing an auxiliary scale part displaying photographic information other than main information by a mark other than numeral. SOLUTION: The auxiliary scale part 53 shows a value which is selected from recommendation values expressed on an ISO and which is other than the value displayed by a main scale part 51. Thus, since a conventional interval can be obtained by providing the scale 50 without making the interval of the numeral 51a, etc., small; visibility can be secured, and also finer division display can be performed. Which position of the part 51 and a position display part 52 or the part 53 has a fixed index 40 is read in the case of reading a photographing distance. Consequently, even though the index 40 is positioned between the numerals 51a of the part 51, etc., the photographing distance can be more accurately read by using the part 53.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel having a scale for displaying photographing information, and more particularly to a lens barrel having a main scale and an auxiliary scale.

[0002]

2. Description of the Related Art Conventionally, a lens barrel is provided with various scales for displaying photographing distance information, focal length information, aperture information, and the like. Hereinafter, a lens barrel that displays shooting distance information will be described as an example. FIG. 3 is a plan view showing an example of a conventional lens barrel. Lens barrel 10
Is a fixed barrel 11 fixed when mounted on the camera body 20, and a focus barrel 1 for performing a focusing operation by being rotated around the optical axis relative to the fixed barrel 11.
And 2. A scale 30 that displays the shooting distance in a numeric string is displayed on the focus tube 12. On the other hand, the fixed barrel 11 is provided with a fixed index 40 for indicating the shooting distance of the focus barrel 12 at that position.

FIG. 4 shows a scale 30 and a fixed index 40 shown in FIG.
FIG. FIG. 4 shows the fixed barrel 11 and the focus barrel 12 in a developed state. As shown in FIG. 4, the scale 30 is 1, 2, 3, 5, 7,
It is composed of a number group in which numbers 30a, 30b,..., 30g of 10 and ∞ are arranged. The units for these numbers are meters.

[0004] Each value of these numbers indicating the shooting distance is
In general, the recommended values shown in ISO 6516 1980 are adopted. The numeral 30a or the like displayed as the scale 30 is obtained by selecting an appropriate value from the values shown in the ISO. This is scale 3
Numerical value 3 indicating shooting distance in consideration of readability of 0
This is because it is necessary to provide an appropriate interval between 0a and the like.

[0005]

However, in the above-described conventional scale 30, since the selected appropriate numerals 30a and the like are merely arranged at intervals, a fixed index 40 is used.
However, there is a problem that the photographing distance located on the extension of the image cannot be accurately read, and a reading error increases. Further, in the projection inspection of the lens barrel, etc., it is necessary to adjust the photographing distance to a desired value by manual operation, but at this time, there is a problem that the photographing distance cannot be accurately adjusted.

[0006] Here, as shown on a scale 30A shown in FIG.
(0 side) is provided with a dot-shaped position display section 31. By doing so, the fixed index 40 and the scale 30A
It is easy to accurately adjust the position of each numeral 30a and the like, and the reading accuracy of the scale 30A can be improved.

However, even in this case, the fixed index 4
The position indicated by 0 is the number 30 on the scale 30A.
When the value is between a and the like, there is a problem that the value cannot be read accurately. This is because the amount of change in the photographing distance between the numeral 30a and the like of the scale 30A is not constant because the amount of rotation of the focus barrel 12 and the photographing distance are not necessarily in a proportional relationship. For example, even when the fixed index 40 is located at an intermediate position between the shooting distance of 1 m and 2 m, the shooting distance is not necessarily 1.5 m.

Accordingly, an object of the present invention is to enable accurate reading of a scale and accurate positioning of the scale without impairing readability of the scale.

[0009]

According to a first aspect of the present invention, there is provided a lens barrel having a scale for displaying specific photographing information by a symbol string including characters or numerals. Is provided between a main scale portion for displaying main information of the shooting information by a group of numbers and a number of the main scale portion, and one or two or more of the shooting information other than the main information is a symbol other than a number. And an auxiliary graduation portion displayed by the following.

According to a second aspect of the present invention, in the lens barrel according to the first aspect, the auxiliary scale portion is a scale used in an inspection relating to the photographing information.

According to a third aspect of the present invention, in the lens barrel according to the first aspect, a fixed barrel fixed to the photographing apparatus when mounted on the photographing apparatus, and an optical axis with respect to the fixed barrel. A focus cylinder that is rotatably moved around, the scale is a symbol string that displays shooting distance information, and is provided around the optical axis on the outer peripheral surface of the focus cylinder. A fixed index for indicating a corresponding position in the shooting distance information displayed on the focus tube is provided.

(Function) In the first aspect of the present invention, the value between the numbers of the main scale portion of the photographing information is read using the auxiliary scale portion. According to the second aspect of the invention, in the inspection related to the photographing information, the photographing distance information of the auxiliary scale is read. According to the third aspect of the present invention, the shooting distance information when the focus barrel is rotated is read using the main scale or the auxiliary scale indicated by the fixed index.

[0013]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a scale 50 as a main part of a first embodiment of a lens barrel according to the present invention. The lens barrel of the present embodiment differs from the conventional example only in the scale provided on the focus barrel 12. Others are the same as those of the conventional example. FIG.
FIG. 7 is a view corresponding to FIG. 4 or FIG. 5 in a conventional example, in which a fixed barrel 11 and a focus barrel 12 are shown in an expanded state.

The scale 50 in FIG.
Each number of 7, 10, and （(In the present invention, ∞ (infinity) is treated as a number. “Numerical” described in claims)
The same applies to the meaning of the term. ) 51a, 51b, ...
A main scale 51 composed of a group of numbers 51g, a position display 52 provided in a dot-like manner below the fixed scale 40 on each numeral 51a of the main scale 51, and a predetermined scale of the main scale 51. A plurality of line-shaped auxiliary graduations 53 (53a, 53b,..., 53e) are provided between the numbers 51a and the like. The unit of these numbers and the like is meters.

The numerals 51a and the like of the main scale 51 are selected from the recommended values shown in ISO 6516 1980, as in the conventional example. Further, the position display unit 52
Is for indicating the position of each numeral of the main scale 51 more accurately. In addition, the auxiliary scale 53 is provided with the IS
The value is selected from the recommended values indicated by O, and indicates a value other than the value displayed in the main scale 51. If the scales 50 are provided in this manner, the intervals between the numbers 50a and the like can be kept as usual without being dense, so that visibility can be ensured and finer scale display is performed. be able to.

When the photographing distance is read, the main scale 51 and the position display 52 or the auxiliary scale 53
The position of the fixed index 40 is read. Therefore, the fixed index 4 is set between the numeral 51a and the like of the main scale 51.
Even when 0 is positioned, the shooting distance can be read more accurately than before using the auxiliary scale section 53.

FIG. 2 is a view showing a scale 50A as a main part of a second embodiment of the lens barrel according to the present invention. In this embodiment, one auxiliary scale portion 53 is provided in the first embodiment. This auxiliary scale 53
Is provided at a position of 3.75 m.

For example, when it is necessary to set the photographing distance to a position of 3.75 m when performing projection inspection of the lens barrel, the position of the auxiliary scale 53 and the fixed index 4
By adjusting 0, the focus barrel 12 is moved to 3.7.
Positioning can be accurately performed at a shooting distance of 5 m.

As described above, one embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications as described below are possible within an equivalent range. (1) In the embodiment, the scale for displaying the photographing distance is described as an example, but the present invention can be applied to a scale for displaying the focal length and the aperture value of the zoom lens or the micro lens. (2) In the embodiment, the auxiliary graduations 32 are provided in a line shape, but may be displayed by dots or other symbols.
Any number may be provided.

[0020]

According to the first aspect of the present invention, photographing information can be accurately read. Further, according to the second aspect of the present invention, it is possible to accurately position the desired photographing information when performing the inspection related to the photographing information. Therefore, workability at the time of inspection can be improved. Furthermore, according to the third aspect of the present invention, it is possible to accurately read the photographing distance and accurately position the photographing distance to be set.

[Brief description of the drawings]

FIG. 1 is a view showing a scale 50 which is a main part of a first embodiment of a lens barrel according to the present invention.

FIG. 2 is a view showing a scale 50A which is a main part of a second embodiment of the lens barrel according to the present invention.

FIG. 3 is a plan view showing an example of a conventional lens barrel.

FIG. 4 is a plan view showing the scale 30 and the fixed index 40 of FIG. 3 in more detail.

FIG. 5 shows a scale 30A as another example of a conventional scale display.
FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Fixed cylinder 12 Focus cylinder 40 Fixed index 50 Scale 51 Main scale 52 Position display 53 Auxiliary scale

Claims (3)

[Claims] 1. A lens barrel having a scale for displaying specific photographing information by a symbol string including a character or a number, wherein the scale is a main scale portion for displaying main information of the photographing information by a group of numerals. A lens barrel provided between the numbers of the main scale section and an auxiliary scale section for displaying one or more of the photographing information other than the main information by a symbol other than a number; 2. The lens barrel according to claim 1, wherein the auxiliary graduation is a graduation used in an inspection related to the photographing information. 3. The lens barrel according to claim 1, wherein the fixed barrel is fixed to the photographing device when the lens barrel is mounted on the photographing device, and is rotated about the optical axis with respect to the fixed barrel. A focus cylinder, wherein the scale is a symbol string for displaying shooting distance information,
The fixed barrel is provided around the optical axis on the outer peripheral surface of the focus barrel, and the fixed barrel is provided with a fixed index for indicating a corresponding position in the shooting distance information displayed on the focus barrel. A lens barrel characterized in that: