JP2001324740A - Lens hood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens hood of which the number of components and cost can be reduced, and also, whose strength and operability are improved. SOLUTION: The lens hood is provided with a cylindrical member (4) with at least one opening part (4a), and a cylindrical light shielding member (7) which is fitted on the outer periphery of the cylindrical member (4), and the opening part (4a) is communicated by moving the cylindrical light shielding member (7) in the optical axis direction of a photographic lens, then, the member (3a) installed inside the cylindrical member (4) is operated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens hood to be attached to the tip of a taking lens.

[0002]

2. Description of the Related Art A conventional lens hood is disclosed in JP-A-9-29.
No. 2647 and Utility Model Registration No. 2600192.

[0003]

SUMMARY OF THE INVENTION Japanese Patent Application Laid-Open No. 9-29264
No. 7 discloses an apparatus in which an operation roller is rotatably provided on a hood and the filter is rotated by a frictional force between the operation roller and the outer peripheral surface of the filter. However, the number of parts constituting the hood is large. There was a problem that cost increased. Further, there is a problem that the outer shape of the hood is increased by the diameter of the operation roller. Japanese Utility Model Registration No. 2600192 discloses a hood in which a notch is provided, but as a result of providing the hood with a notch, there is a problem that the strength of the hood is insufficient. Further, there is room for improvement in that the operability deteriorates because the member (12) to be rotated is located inside the fixing member (11).

[0004] The present invention has been made in view of the above problems, and has as its object to provide a lens hood excellent in strength and operability while reducing the number of parts and reducing the cost.

[0005]

In order to achieve this object, the invention according to claim 1 has at least one opening (4).
a) and a cylindrical light-blocking member (7) fitted to the outer periphery of the cylindrical member (4), and the cylindrical light-blocking member (7) is placed in the optical axis direction of the taking lens. , The opening (4a) is communicated, and the member (3a) inside the tubular member (4) can be operated.

According to a second aspect of the present invention, there is provided a tubular member (4) having an opening (4a) at least at one position, and a notch portion (4) fitted at an outer periphery of the tubular member (4). And a cylindrical light-shielding member (5) having a cylindrical member (5a). The cylindrical light-shielding member (5) is rotated around the optical axis of the photographing lens so as to communicate with the opening (4a). It is characterized in that the member (3a) inside 4) can be operated.

According to a third aspect of the present invention, there is provided a flexible cylindrical member (21) which rotates around the optical axis of the taking lens, and the flexible cylindrical member (21) is engaged by being deformed by pressing. Thus, the member (3a) inside the cylindrical member (21) can be rotated.

[0008] The invention of claim 4 is the first to third aspects of the present invention.
The member (3a) inside the tubular member (4, 21)
Is a filter attached to the tip of the taking lens.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 are a perspective view and a sectional view showing a first embodiment of a lens hood according to the present invention.

In FIG. 1 to FIG. 3, a hood 2 is attached to a leading end (object side) of a photographing lens 1 by a known means. The hood 2 includes a hood body 4, a light-shielding ring 5, and a tip cap 6. The hood body 4 has a cylindrical shape, and has an opening 4a and a projection 4b. The light-blocking ring 5 has a cylindrical shape and has a notch 5a. The light shielding ring 5 is attached to the hood main body 4 so as to be rotatable on the outer periphery of the hood main body 4. The protrusion 4 b and the tip cap 6 serve to prevent the light-shielding ring 5 from coming off the outer periphery of the hood main body 4.

As shown in FIG. 3, a polarizing filter 3 is screwed to the tip of the taking lens 1 inside the hood body 4. The polarization filter 3 has an adjustment ring 3a, and the rotation angle of the adjustment ring 3a can adjust the polarization angle.

When the light shielding ring 5 is rotated in the direction of arrow A (FIG. 1) so that the opening 4a and the notch 5a coincide with each other as shown in FIG. 1, the opening 4a and the notch 5a pass through the notch 5a. The rotation of the adjustment ring 3a of the polarizing filter 3 can be adjusted by a photographer with a finger. That is, the photographer can adjust the polarization angle of the polarizing filter 3 without removing the hood 2 and visually recognize the effect of the polarizing filter 3 with a finder (not shown).

When the desired polarization angle can be adjusted, the light-shielding ring 5 is rotated in the direction of arrow A (FIG. 1) to cover the opening 4a with the light-shielding ring 5, thereby completing the preparation for photographing. The reason why the opening 4a is covered with the light-shielding ring 5 is to satisfy the light-shielding function of the hood 2 as a hood. in this way,
The photographer can adjust the polarization angle of the polarizing filter 3 without removing or attaching the hood 2, and the operability is greatly improved.

FIGS. 4 and 5 are perspective views showing a second embodiment of the lens hood according to the present invention. In the figures, FIGS.
The same components as those described above are denoted by the same reference numerals, and redundant description will be omitted.

In this embodiment, a light shielding ring 7 is provided instead of the light shielding ring 5 of the first embodiment. The light-blocking ring 7 has a cylindrical shape, and the photographer can slide (slide) the outer periphery of the hood body 4 with the finger in the direction of arrow B (FIG. 4). The light-shielding ring 7 is not provided with a notch (the notch 5a of the first embodiment).

FIG. 4 shows a state in which the light shielding ring 7 is slid (slid) toward the subject.
Through the “a”, the photographer can rotate and adjust the adjustment ring 3 a of the polarization filter 3 with the finger. In other words, the photographer adjusts the polarization angle of the polarizing filter 3 without removing the hood 2 to obtain the effect of the polarizing filter 3 through a finder (not shown).
Can be visually recognized.

To shield the opening 4a, the light-shielding ring 7 is slid in the direction of arrow B (FIG. 4) to move to the position shown in FIG. As a result, the opening 4 a is
The camera is ready for shooting. As described above, the photographer can adjust the polarization angle of the polarizing filter 3 without removing or attaching the hood 2, and the operability is greatly improved.

FIG. 6 shows a third embodiment of the lens hood according to the present invention.
It is sectional drawing which shows embodiment. In the drawings, the same components as those in FIGS. 1 to 5 are denoted by the same reference numerals, and redundant description will be omitted.

In this embodiment, the flexible hood 21 is attached to the front end (object side) of the taking lens 1 by the hood flange 2.
It is rotatably attached to the photographing lens 1 via the retaining member 2 and the retaining member 23. Flexible hood 21
Has such flexibility that it is deformed when pressed with a finger.

FIG. 6 shows a state in which the photographer presses the deforming portion 21a with a finger, and the adjusting ring 3a of the polarizing filter 3 can be rotated and adjusted via the deforming portion 21a. At this time, the flexible hood 21 rotates together with the adjustment ring 3a due to the interposition of the hood flange 22 and the retaining member 23.

When the desired polarization angle can be adjusted, the user simply releases the finger holding down the flexible hood 21 to complete the preparation for photographing. In the third embodiment, since the opening 4a in the first and second embodiments is not provided, light shielding properties are always ensured even during the adjustment of the polarization angle. In addition, there is no need to move the light shielding ring 5 or the light shielding ring 7.

According to the first to third embodiments described above, since the rotation of the polarizing filter can be adjusted while the hood is attached to the lens, there is an effect that the photographing operation using the polarizing filter becomes easy. Further, since the number of components at one point can be increased, the above-described effect can be obtained at low cost.

According to the first and second embodiments, the operation of shielding the opening after the polarization filter rotation is adjusted is only by rotating or sliding the light shielding ring, and there is an advantage that the photographing posture can be immediately taken.

In the second embodiment, there is no need to provide a cutout portion in the light-shielding ring 7, so that there is an advantage that the manufacture of the light-shielding ring 7 is further facilitated.

In the third embodiment, since the opening 4a is not provided, the light shielding property is always ensured even during the adjustment of the polarization angle. Also, the light-blocking ring 5 or the light-blocking ring 7
There is no need to move the.

Although the present invention has been described with reference to the embodiment, various modifications are possible in accordance with the technical concept of the present invention. For example, in the first embodiment described above, the hood main body 4 is described as having a cylindrical shape, but the present invention can be applied to a case where the hood body is not a cylindrical shape but a conical shape.

Further, in the above-described second embodiment, the hood main body 4 has been described as having a cylindrical shape, but the present invention can be applied to a case where the hood main body is not a cylindrical shape but a rectangular tube shape.

Further, in the first to third embodiments, a rotation preventing (click) function may be added.

[0030]

As described above, according to the lens hood of the present invention, since the rotation of the polarizing filter can be adjusted while the hood is attached to the lens, the photographing operation using the polarizing filter is facilitated. .

Also, since the number of parts can be slightly increased,
The above effects can be obtained at low cost.

Further, the operation of shielding the opening after the polarization filter rotation is adjusted is only rotation or sliding of the light-shielding ring, and there is an advantage that the photographing posture can be immediately taken.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a lens hood according to the present invention.

FIG. 2 is a perspective view showing a first embodiment of a lens hood according to the present invention.

FIG. 3 is a sectional view showing a first embodiment of a lens hood according to the present invention.

FIG. 4 is a perspective view showing a second embodiment of the lens hood according to the present invention.

FIG. 5 is a perspective view showing a second embodiment of the lens hood according to the present invention.

FIG. 6 is a sectional view showing a third embodiment of the lens hood according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Photographing lens 2 Hood 3 Polarizing filter 3a Adjustment ring 4 Hood main body 4a Opening 4b Projection 5 Light shielding ring 5a Part 6 Tip cap 7 Light shielding ring 21 Flexible hood 21a Deformation part 22 Hood flange 23 Retaining member

Claims (4)

[Claims] A cylindrical member having an opening in at least one position; and a cylindrical light shielding member fitted to an outer periphery of the cylindrical member. A lens hood, wherein the lens hood is moved to move the opening to communicate with a member inside the tubular member. A cylindrical member having an opening in at least one place; and a cylindrical light-shielding member fitted to an outer periphery of the cylindrical member and having a cutout in at least one place. A lens hood, wherein a light-shielding member is rotated about an optical axis of a taking lens to communicate the opening, and a member inside the cylindrical member can be operated. 3. A flexible cylindrical member which rotates around an optical axis of a taking lens, wherein said flexible cylindrical member is pressed inside said cylindrical member by being deformed by pressing. A lens hood characterized in that the member can be rotated. 4. The lens hood according to claim 1, wherein the member inside the cylindrical member is a filter attached to a tip of the photographing lens.