JP2002236304A - Lens hood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a lens hood constituted so that a filter or the like is easily attached/detached while the hood is still attached as a lens hood used for a lens barrel having a filter attaching/detaching part at its top end part. SOLUTION: This lens hood is constituted of an outside hood and an inside hood having a ridge part and a valley part respectively, and at least either the inside hood or the outside hood is provided to relatively turn to the other. When the outside hood and the inside hood are relatively turned by a specified amount, at least one valley part of the outside hood is aligned with that of the inside hood, and the outer peripheral surface of the filter attached to the filter attaching part is exposed through the valley part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lens hood for a lens barrel.

[0002]

2. Description of the Related Art For example, in an interchangeable lens barrel for a single-lens reflex camera, a hood for preventing incidence of harmful light may be provided at the tip of the barrel. As the hood, there are known a detachable type that can be attached to and detached from a lens barrel and a non-removable type (fixed type) that cannot. In addition, various filters may be attached to the tip of the lens barrel depending on the purpose of photographing.
Since both the hood and various filters are provided at the distal end of the lens barrel, the presence of the hood sometimes makes it difficult to attach and detach the filters. In other words, the hood covers the outer periphery of the distal end of the lens barrel due to the property of preventing harmful light (unnecessary light for photographing) from entering, and the filters are provided at a portion where light enters the lens barrel. Things. For this reason, in a lens barrel having (attached) a hood, the hood makes it difficult to attach and detach filters. In particular, in the case of a hood having a projection corresponding to each side of a rectangular screen, it is practically impossible to perform a detaching operation by putting a finger on the outer peripheral surface of the filters on the hood. For this reason, the attachment and detachment of the filters must be performed by applying a rotational force from the end face, which is very difficult.

[0003]

An object of the present invention is to provide a lens hood for use in a lens barrel having a filter attaching / detaching portion at the distal end based on the above problem awareness, in which filters can be easily attached / detached while the hood is attached. The purpose is to.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a lens hood for use in a lens barrel having a filter attaching / detaching portion at a distal end thereof, wherein the lens hood comprises an outer hood having a peak and a valley, and an inner hood. Also, at least one of the inner hood and the outer hood is provided so as to be relatively rotatable with respect to the other, and when the outer hood and the inner hood are relatively rotated by a predetermined amount, the outer hood and the inner hood are rotated. The filter is characterized in that at least one valley coincides and the outer peripheral surface of the filter mounted on the filter mounting portion is exposed through the valley. According to this configuration, the outer hood and the inner hood are relatively rotated to match the positions of the valleys, whereby the filters can be easily attached and detached.

One of the outer hood and the inner hood is fixed to the lens barrel, and the other is rotatable with respect to the lens barrel. This lens hood can be applied to either the detachable type that allows the entire outer hood and the inner hood to be attached to and detached from the lens barrel, or the non-detachable type that is irremovably provided. If removed, the filters can be easily attached and detached. Therefore, it is more effective if applied to a non-detachable lens hood.

It is practical that the peaks and the valleys of the outer hood and the inner hood are arranged 180 ° opposite each other. The screen size of a normal camera is a rectangle (having different vertical and horizontal lengths). For this reason, the heights of the ridges of the outer hood and the inner hood are made different so that the height of the ridge located on the long side is higher and the height of the ridge located on the shorter side is lower. , A more effective lens hood action can be obtained.

[0007] It is preferable to provide a click stop means for temporarily fixing the outer hood and the inner hood in a superimposed state in which the valleys coincide with each other.

Furthermore, if space permits, the return from the overlapping state in which the valleys of the outer hood and the inner hood coincide with each other to the use state in which the valleys of the outer hood and the inner hood coincide. Means may be provided.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a hood of an interchangeable lens for a single-lens reflex camera will be described below. The lens hood of the present embodiment includes an inner hood 2 and an outer hood 3 which are engaged so as to be relatively rotatable without detaching. As shown in FIG. 1, the outer hood 3 includes an inner ring 3A fixed to the outer peripheral surface of the lens barrel 1 and an outer ring 3B rotatably supporting the inner hood 2 between the inner ring 3A. Has become. The inner ring 3A and the outer ring 3B are connected by a radial connection member (not shown) provided at a part in the circumferential direction. The lens hood of this embodiment is a non-detachable type that cannot be attached to and detached from the interchangeable lens barrel 1, but may be a detachable type that can be attached and detached.

The interchangeable lens barrel 1 is provided with a filter attachment / detachment section 5 for attaching / detaching the filter 4 at the inner periphery of the distal end of the lens barrel. The filter 4 is a concept including various filters and accessories. Filter attaching / detaching part 5
Consists of female threads or bayonet, as is well known,
The filter 4 having an outer peripheral surface having a male screw or a bayonet can be attached and detached by rotating the filter 4 in the normal and reverse directions.

As shown in FIGS. 2 and 3, the inner hood 2 has a plurality of peaks 2M and valleys 2V alternately protruding forward from the front end of the interchangeable lens barrel 1 at the distal end. In this embodiment, each peak 2M and valley 2
Two Vs are provided at intervals of 180 ° over a predetermined length in the circumferential direction.

The outer ring 3B of the outer hood 3 is provided so as to overlap the outer side of the inner hood 2, and has a plurality of peaks and valleys alternately like the inner hood 2. That is,
The outer hood 3 (the outer ring 3B) is also provided with two peaks 3M and two valleys 3V at predetermined intervals along the circumferential direction at 180 ° intervals. In other words, both the inner hood 2 and the outer hood 3 are arranged such that the peaks 2M, 3M and the valleys 2V, 3V are opposed to each other by 180 °.

The height H ₁ (FIG. 2) of the peak 3M of the outer hood 3 (projection length in the direction parallel to the optical axis) is higher than the height H ₂ of the peak 2M of the inner hood 2. The height 3M of the outer hood 3 having a high height is positioned so as to correspond to the long side (the side having a small angle of view) of the rectangular shooting screen, and the inner hood 2 having a low height is positioned.
By positioning the peak 2M of the corresponding to the short side (the side having a large angle of view), a more effective hood effect (effect of blocking harmful rays) can be obtained.

When these inner hoods 2 and outer hoods 3 are used as hoods, FIGS.
As shown in (2), relative rotation is performed so that the center of both valleys overlaps (coincides with) the center of the peak (hereinafter, referred to as a use state). In other words, the centers of both peaks (or valleys) are set at positions shifted by 90 ° in phase difference.

On the other hand, when the filter 4 is attached to or detached from the filter attaching / detaching portion 5 of the lens barrel 1, as shown in FIGS. 4 and 5, the centers of both valleys are overlapped (coincident). (Hereinafter referred to as a superposed state). When the positions of the valleys 2V and 3V of the inner hood 2 and the outer hood 3 are matched in this way, the outer peripheral surface of the filter 4 that is attached to and detached from the filter attaching / detaching portion 5 from the overlapping portion of the valley is exposed. I do. In other words, this valley 2V,
3V constitutes an attaching / detaching portion (gap) D when attaching / detaching the filter 4, and in this embodiment, it is formed at two places 180 ° out of phase.

Therefore, according to this embodiment, a finger can be inserted into each of the two attachment / detachment portions D, and the filter 4 can be gripped by these fingers so as to sandwich the filter 4 from both sides. Thus, it can be attached to and detached from the lens barrel 1.

In the above embodiment, the outer hood 3 is fixed to the lens barrel 1, and the inner hood 2 is
Is relatively rotatable with respect to. For this reason, there is an advantage that the possibility that the inner hood 2 rotates carelessly can be reduced. Of course, a mode in which the inner hood 2 is fixed to the lens barrel 1 is also possible. In this mode, the turning operation of the outer hood 3 is not hindered by the inner hood 2 and the turning operation can be easily performed. There are advantages.

Between the inner hood 2 and the outer hood 3,
In each of the use state and the polymerization state (or at least in the use state), click stop means for providing resistance to the relative rotation between the inner hood 2 and the outer hood 3 can be provided. Such click stop means are well known. Alternatively, if space permits, a return means for rotating and biasing the inner hood 2 and the outer hood 3 to the use state is provided, and after the overlap state, the operation state is automatically set when the operating force is released. You can also.

[0019]

According to the lens hood of the present invention, filters can be easily attached to and detached from the filter attaching / detaching portion at the tip of the lens barrel.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment in which a lens hood according to the present invention is applied to an interchangeable lens barrel for a single-lens reflex camera.

FIG. 2 is a side view showing a lens hood structure of the interchangeable lens barrel of FIG.

FIG. 3 is a side view seen from a direction different from that of FIG. 2 by 90 °.

FIG. 4 is a side view showing an arrangement state of a hood when attaching and detaching filters.

FIG. 5 is a side view seen from a direction different from that of FIG. 4 by 90 °.

[Explanation of symbols]

 Reference Signs List 1 interchangeable lens barrel 2 inner hood 2M peak 2V valley (detachable part) 3 outer hood 3M peak 3V valley (detachable part) 4 filter 5 filter detachable part D detachable part (gap)

Claims (4)

[Claims] 1. A lens hood for use in a lens barrel having a filter attachment / detachment portion at a distal end, wherein the lens hood comprises an outer hood and an inner hood each having a peak and a valley. At least one of the inner hood and the outer hood is provided so as to be rotatable relative to the other, and when the outer hood and the inner hood are relatively rotated by a predetermined amount, at least one of the outer hood and the inner hood is provided. A lens hood, wherein the valleys coincide with each other, and the outer peripheral surface of the filter mounted on the filter mounting portion is exposed through the valley. 2. The lens hood according to claim 1, wherein
A lens hood in which one of an outer hood and an inner hood is fixed to a lens barrel, and the other is rotatable with respect to the lens barrel. 3. The lens hood according to claim 1, wherein the outer hood and the inner hood have a peak portion and a valley portion which are disposed so as to face each other by 180 °. 4. The lens hood according to claim 3, wherein
A lens hood in which the outer hood and the inner hood have different mountain heights.