JP2023169671A - Lens hood - Google Patents

Abstract

To provide a lens hood capable of minimizing deformation thereof when grabbed by a user.SOLUTION: A lens hood 100 that can be detachably attached to a lens barrel 200 via a bayonet mechanism 102 is provided, the lens hood comprising a resin hood body 101 and a ring member 103 made of a material stronger than the hood body. The hood body 101 has a press-fit surface 101a near an object side of the bayonet mechanism 102, and the ring member 103 is press-fit against the press-fit surface 101a.SELECTED DRAWING: Figure 1

Description

The present invention relates to a lens hood that can be attached to a lens barrel.

It has become common for digital still cameras and other devices to have a lens hood attached to the tip of the lens barrel to block harmful light. For example, Patent Document 1 is an invention of a lens hood attached to such a lens barrel.

The removable lens hoods described above are generally made of resin (EP), but some are also made of metal (aluminum). For example, there is Patent Document 2 as an invention related to a metal lens hood. In the invention disclosed in Patent Document 2, the hood ring 101, which occupies most of the hood appearance, is made of metal, and the hood bayonet ring 102, in which the bayonet mechanism is molded, is made of resin because elastic deformation is required. By using metal materials for the exterior of the hood, it is expected that the strength and texture will be improved.

Patent No. 6478874 Patent No. 6701998

By the way, in the type of lens hood that can be attached and detached via a bayonet mechanism by user operation described in the above-mentioned prior art document, the lens hood made of resin is deformed when the user holds it. This deformation of the hood occurs not only in the radial direction but also in the optical axis direction depending on the position and force applied by the user.

In recent years, there has been a trend for interchangeable lenses attached to digital still cameras to be of high quality not only in terms of optical performance but also in terms of overall construction, including appearance and operational feel. For this reason, efforts are being made to minimize play between the lens barrel and lens hood. In such a situation, even a slight deformation of the lens hood may deteriorate the sliding properties of the sliding portion of the bayonet mechanism, or the sliding portion may become jammed, making it difficult to attach or remove the lens hood.

Although the above-mentioned prior art documents mention deformation in the radial direction, they do not mention deformation in the optical axis direction, and as mentioned above, the deformation of the hood varies depending on the location, so these problems should not be considered. To solve this problem, it is necessary to simply increase the rigidity and strength of the lens hood.

Furthermore, focusing on the click feeling when attaching and removing the lens hood, this click feeling is also considered to be an important element for making interchangeable lenses of high quality. Therefore, the click mechanism that generates the click feeling is often manufactured with high precision like the bayonet mechanism, and the click feeling when the hood is attached or removed changes due to the deformation of the hood caused by the user's grip, causing a change in the user's feeling. There is a risk that the quality of the service received may deteriorate.

In the above-mentioned prior art document, the click portion requires appropriate elasticity in order to provide a good click feeling, and does not take measures against deformation caused by gripping the hood.

It is conceivable to manufacture the lens hood using a metal material in order to suppress the deformation of the entire hood, but the shape is complicated and the processing cost increases. Furthermore, it is not practical to process the click mechanism using a metal material, and it is necessary to fix the lens hood using, for example, a locking mechanism, which inevitably increases the number of parts.

Additionally, the lens hood that is attached to the tip of an interchangeable lens tends to come into contact with surrounding objects when taking pictures, and is prone to scratches and dents. When a lens hood is made of metal, there is also the problem that scratches and dents are more noticeable than those made of resin. Furthermore, in terms of weight, resin is more preferable than metal.

The present invention has been made in view of this situation, and an object of the present invention is to provide a lens hood that can minimize deformation caused by a user's grip.

In order to achieve the above object, a lens hood embodying the present invention is removable from the lens barrel via a bayonet mechanism, and includes a hood body made of resin and a ring member made of a material stronger than the hood body. The hood body has a press-fit surface near the object side of the bayonet mechanism, and the ring member is press-fit into the press-fit surface.

Further, in the lens hood according to the present invention, preferably, the bayonet mechanism is provided at a flange portion extending in the optical axis center direction on the inner peripheral surface of the hood body, and the ring member is provided in the optical axis direction with respect to the flange portion. It may come into contact with.

According to the lens hood according to the present invention, it is possible to provide a lens hood that can suppress deformation caused by user's grip to a small level.

A perspective view of the lens hood viewed from the subject side. An exploded perspective view of the lens hood. FIG. 3 is a partial cross-sectional view showing a state in which the lens hood is attached to the tip of the lens barrel.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. Note that the present invention is not limited to this embodiment.

FIG. 1 is a perspective view of a lens hood 100 according to an embodiment of the present invention, viewed from the subject side. In this figure, 100 is a lens hood, 101 is a hood body, 102 is a bayonet mechanism, and 103 is a ring member. The lens hood 100 has a bayonet mechanism provided at the end on the camera side and a bayonet mechanism provided at the tip of the lens barrel (not shown) on the subject side, respectively. Sliding parts are slid and the claw parts are engaged. By fitting the device, the user can attach and detach it as desired.

In the lens hood 100 of this embodiment, the hood body 101 and the bayonet mechanism 102 are integrally molded using a resin material. Further, the ring member 103 is made of a material stronger than the resin material used for molding the hood body 101 and the bayonet mechanism 102. For example, metal (aluminum) can be used as a material with high strength. This ring member 103 will be described in detail later.

FIG. 2 is an exploded perspective view of the lens hood 100. This figure shows a state in which the lens hood 100 is cut along a plane passing through the optical axis. Further, FIG. 3 is a cross-sectional view showing a state in which the lens hood 100 is attached to the tip of the lens barrel 200.

The hood main body 101 made of resin includes a press-fit surface 101a at a predetermined position on the inner peripheral surface. This press-fitting surface 101a is provided over the entire circumference of the inner peripheral surface of the hood. Further, the hood main body 101 includes a flange portion 102a extending in the optical axis center direction over the entire circumference of the hood inner peripheral surface. The flange portion 102a is provided at its tip with a sliding portion (not shown), a claw portion (not shown), and a notch portion (not shown) that function as the bayonet mechanism 102.

The ring member 103 is press-fitted into this press-fitting surface 101a from the subject side. As can be seen from Figure 3,
The press-fitting surface 101a and the flange portion 102a are adjacent to each other in the optical axis direction. Therefore, the ring member 103 press-fitted to the subject side in the optical axis direction comes into contact with the wall surface of the flange portion 102a in the optical axis direction and is locked.

As described above, the ring member 103 that is press-fitted into the hood body 101 is made of a material that has higher strength than the material of the hood body 101. This increases the strength of the lens hood 100 compared to a case where the lens hood 100 is made of a single material such as resin, so that deformation of the lens hood 100 caused by the user's grip can be suppressed. Furthermore, changes in the click feeling that may occur due to deformation of the lens hood 100 can be similarly suppressed.

Further, a ring member 103 that is press-fitted into the lens hood 100 is locked near the bayonet mechanism 102. This makes it possible to more effectively suppress deformation in the bayonet mechanism 102, which directly affects sliding properties during attachment and detachment and deterioration of click feeling. Furthermore, since the deformation suppressing effect is sufficiently large, it is possible to reduce the size of the ring member 103.

Note that in the above-described embodiment, the ring member 103 was locked by coming into contact with the flange portion 102a, but the present invention is not limited to this, and if the ring member 103 is locked near the bayonet mechanism 102, the lens hood 100 may be deformed in the same manner. A deterrent effect can be obtained.

As explained above, according to the lens hood according to the present invention, for example, by press-fitting a ring member with higher strength into the hood body made of resin, deformation caused by the user's grip can be suppressed to a minimum, and the hood can be It is possible to suppress the deterioration of sliding properties during attachment and detachment and the deterioration of the click feeling.

100 Lens hood 101 Hood main body 101a Press-fit surface 102 Bayonet mechanism 102a Flange portion 103 Ring member 200 Lens barrel

Claims (2)

A lens hood that can be attached to and detached from a lens barrel via a bayonet mechanism has a hood body made of resin and a ring member made of a material with higher strength than the hood body, and the hood body is located near the object side of the bayonet mechanism. A lens hood comprising a press-fit surface, and the ring member is press-fit into the press-fit surface. The bayonet mechanism is provided on an inner circumferential surface of the hood main body at a flange extending in the optical axis direction, and the ring member abuts on the flange in the optical axis direction. 1. The lens hood described in 1.

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