JPH041711A - Structure for connecting lens to optical filter and lens hood - Google Patents

Abstract

PURPOSE:To prevent the change in initial appearance and design even if an optical filter is mounted by forming a lens hood to the inside diameter larger than the outside diameter of the optical filter and mounting the lens hood at the front end of the lens so as to conceal the optical filter. CONSTITUTION:The lens hood 2 is formed to the inside diameter larger than the outside diameter of the optical filter 5 and the lens hood 2 is so mounted at the front end of the lens 1 as to conceal the optical filter 5. The optical filter 5 is, therefore, not exposed to the surface. The overall length of the equipment does not consequently increase even if the optical filter is mounted thereon. The initial appearance and image are not impaired in this way even if the optical filter is held mounted at all times.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention generally relates to a connection structure between a lens, an optical filter, and a lens hood, which is used in a camera-integrated video camera, etc., and has a more specific field. This invention relates to a connection structure between a lens, an optical filter, and a lens hood, which is improved so that the original external design does not change even when an optical filter is attached.

[Prior Art] FIG. 5 is a partial sectional view of a conventional connection portion between a lens and a lens hood. Referring to FIG. 5, a lens barrel 3 is provided at the tip of the lens 1. A thread groove 4 is provided on the inner periphery of the lens barrel 3. The lens hood 2 is attached to the lens barrel 3 by fitting a thread provided on the outer circumference of one end of the lens hood 2 into the thread groove 4 . This thread groove 4 is generally cut to the optical filter thread diameter set by JIS.

FIG. 6 is a partial cross-sectional view of a structure in which an optical filter is attached to the connection portion between the lens and the lens hood shown in FIG. Referring to FIG. 6, a male thread 6 is formed on the outer periphery of one end of the optical filter 5. The male thread 6 fits into a thread groove 4 provided on the inner periphery of the lens barrel 3. A female thread 7 that fits into the thread of the lens hood 2 is formed on the inner peripheral portion of the other end of the optical filter 5 . By fitting the male thread 6 of the optical filter 5 into the thread groove 4 of the lens barrel 3, and fitting the thread of the lens hood 2 into the female thread 7 of the optical filter 5, the connection between the lens barrel 3 and the lens hood 2 is established. An optical filter 5 is installed between them.

[Problems to be Solved by the Invention] Since the conventional connection structure between a lens, an optical filter, and a lens hood is configured as described above, referring to FIG. The overall length of the device becomes longer. As a result, the device sometimes gets bumped into the device carrying case, making it inconvenient to handle. Furthermore, since the optical filter 5 is exposed on the surface, there is a problem that the original design image shown in FIG. 5 is disrupted. Furthermore, recently, in order to protect the glass of the lens 1, a multi-coating (MC) filter is often always attached and used, which has caused the problem that the design image is always being destroyed.

This invention was made to solve the above-mentioned problems, and is an improved connection between a lens, an optical filter, and a lens hood so that the original external design does not change even when an optical filter is attached. The purpose is to provide structure.

[Means for Solving the Problems] The present invention relates to a connection structure between a lens, an optical filter, and a lens hood, in which an optical filter and a lens hood are attached to the tip of a lens. In order to solve the above problem, the inner diameter of the lens hood is made larger than the outer diameter of the optical filter, and the lens hood is attached to the tip of the lens so as to cover the optical filter. It is characterized by being

[Function] The inner diameter of the lens hood is larger than the outer diameter of the optical filter, and the lens hood is attached to the tip of the lens so as to cover the optical filter, so the optical filter is not exposed on the surface.

Therefore, even if an optical filter is attached, the overall length of the device does not increase. Furthermore, since the optical filter is not exposed on the surface, even if the optical filter is always attached, the original appearance image will not be destroyed.

Embodiment FIG. 1 is an external view of a camera-integrated video camera including a connection structure between a lens, an optical filter, and a lens hood according to an embodiment of the present invention. A lens hood 2 is attached to the tip of the lens 1.

As shown by hidden lines (broken lines) in the figure, an optical filter is arranged inside the lens hood 2, as will be described later.

FIG. 2 is a perspective view of a connection structure between a lens, an optical filter, and a lens hood. FIG. 3 is a diffusion exploded view of the connection structure between a lens, an optical filter, and a lens hood. FIG. 4 is a sectional view taken along the line ■ to ■ in FIG. 2.

Referring to FIG. 3, the connection structure includes a lens 1, an optical filter 5, and a lens hood 2.

The inner diameter of the lens hood 2 is thicker than the outer diameter of the optical filter 5. On the outer peripheral surface of one end of the optical filter 5,
A male thread 5a is formed. A female thread 2a is formed on the inner peripheral surface of the lens hood 2. A lens barrel 3 is attached to the tip of the lens 1. A male thread 5 formed at one end of the optical filter 5 is provided on the inner peripheral surface of the tip of the lens barrel 3.
A threaded groove 9 is formed to fit into the hole a. The outer peripheral surface of the lens barrel 3 has a female thread 2 formed on the inner peripheral surface of the lens hood 2.
A screw thread 8 is formed to fit into the hole a.

Commonly used optical filters are MC filters,
These are ND filters, color filters, and polarizing filters.

The optical filter 5 has a constant shape with respect to the thread groove 9 formed in the lens barrel 3, except for special filters (mirash, paricross, etc.). Therefore, when determining the shape of the lens hood 2, it is necessary to consider the size of the general optical filter 5.

Referring to FIGS. 2, 3, and 4, a male thread 5a of the optical filter 5 is inserted into a thread groove 9 provided on the inner periphery of the lens barrel 3.
mate. In this state, the female thread 2a formed on the inner circumferential surface of the lens hood 2 is fitted into the thread 8 provided on the outer circumferential surface of the lens barrel 3, thereby assembling the lens hood 2.

When the assembly is completed, referring to FIGS. 1, 2 and 4, the optical filter 5 is no longer exposed on the surface. As a result, even if the optical filter 5 is attached, the overall length of the device does not increase. Furthermore, since the optical filter 5 is not exposed on the surface, the original appearance image will not be damaged even if the optical filter 5 is attached.

[Effects of the Invention] As explained above, according to the present invention, the inner diameter of the lens hood is larger than the outer diameter of the optical filter, and the lens hood is attached to the tip of the lens so as to cover the optical filter. The optical filter is not exposed on the surface. Therefore, even if an optical filter is installed,
The overall length of the equipment will not increase. As a result, there is no problem in carrying the device. Furthermore, since the optical filter is not exposed on the surface, the original appearance image will not be damaged even if the optical filter is always attached.

[Brief explanation of drawings]

FIG. 1 is an external view of a camera-integrated video camera including a connection structure between a lens, an optical filter, and a lens hood according to an embodiment of the present invention. FIG. 2 is a perspective view of a connection structure between a lens, an optical filter, and a lens hood. FIG. 3 is a diffusion exploded view of the connection structure between a lens, an optical filter, and a lens hood. FIG. 4 is a sectional view taken along the line ■ to ■ in FIG. 2. FIG. 5 is a sectional view of a conventional connecting portion between a lens and a lens hood. FIG. 6 is a partial cross-sectional view of a structure in which an optical filter is attached to the connection portion with the lens hood shown in FIG. In the figure, 1 is a lens, 2 is a lens hood, 2a is a female thread, 3 is a lens barrel, 5 is an optical filter, 5a is a male thread, 8
is a screw thread, and 9 is a screw groove. In each figure, the same reference numerals indicate the same or corresponding parts. 5a: Bnσ 8 screw L

Claims (1)

[Claims] In a connection structure between a lens, an optical filter, and a lens hood, in which an optical filter and a lens hood are attached to the tip of the lens, an inner diameter of the lens hood is larger than an outer diameter of the optical filter. A connection structure between a lens, an optical filter, and a lens hood, characterized in that the lens hood is attached to a tip of the lens so as to cover the optical filter.