JPH08248497A - Conversion lens device - Google Patents

Abstract

PURPOSE: To mount the body of a lens with strong holding force without aligning it with the body of a camera, to eliminate fears for dropping it and to enable the exchange of various kinds of lenses by providing engaging projections capable of engaging with the inner peripheral groove part of a mount member on button members. CONSTITUTION: When the lens body 3 is mounted on the mount member 2 attached to the camera main body, a part as a lens holder 15 is inserted into the mount member 2, while a pair of the button members 9 are pressed and then, they are released. Therefore, the engaging projection parts 23 provided on the button members 9 respectively are fit fast to the inner peripheral groove and annular projection part 6 of the opening part of the mount member 2, to be firmly fitted and the lens body 3 is connected to the mount member 2. At this time, both surfaces of the inside and outside of the annular projection part 6 of the mount member 2 are firmly contact-engaged over the side surface of the engaging projection parts 23 of the button members 9 and the side surface of a lens barrel member 18. Thus, mount holding force is increased to enable firm mounting, an optical axis is surely aligned and the dropping of the lens body 3 can be prevented as well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conversion lens device such as an auxiliary lens device, particularly for a video camera.
The present invention relates to a conversion lens device for a millimeter camera.

[0002]

2. Description of the Related Art In recent years, a large number of video cameras, 35 mm cameras, etc. have been manufactured in large quantities. There is an increasing demand for a conversion lens device for taking images and the like. Therefore, tele and wide conversion lenses, etc., which are individually adapted to meet such demands, are manufactured and commercially available.

[0003]

However, such tele and wide conversion lenses must be individually attached to the lens barrel of the photographing lens of the camera body by screwing or the like. The conversion lens is problematic in that it is troublesome to install and remove, and is troublesome.

Further, there is a hook on the mount portion and a button on the lens frame, and a screw-shaped protrusion formed on the surface of the hook causes the lens barrel of the photographing lens of the camera body to operate. There is a conversion lens that can be attached by screwing on a screw, but such a conversion lens must be installed by aligning it in the correct mounting position, and the holding power is weak, and even if it is touched or a slight shock is received There are some defects such as easy detachment and falling.

Therefore, the object of the present invention is to solve the above-mentioned problems in the prior art, without the need for alignment with the camera body, it can be easily attached with a strong holding force, and there is no fear of dropping. , To provide a conversion lens device capable of various lens exchanges.

[0006]

In order to achieve the above object, according to the present invention, a conversion lens device is screwed to a lens barrel of a photographing lens of a camera body and has an inner circumferential groove in an opening. And a lens body having a lens group forming a required lens configuration, a pair of button members are provided on the lens body so as to face each other in a diametrical direction of the lens body, and an inner circumference of the mount member is provided. The button member is characterized in that the button member is provided with an engaging protrusion capable of engaging with the groove portion.

[0007]

In the conversion lens device of the present invention constructed as described above, the mount member is first screwed and mounted on the taking lens of the camera body, and then the button member of the lens body is pressed. Insert the engaging projection of the button member of the lens body into the opening of the mount member, and release the button member there, and the engaging projection of the button member will fit firmly into the inner circumferential groove of the entire circumference of the mount member. Since the lens body is firmly attached to the camera body, the lens body can be attached to the camera body with a strong holding force.
° It can be attached at any position, and the conversion lens device can be removed with one touch by pressing the button member as easily as attachment. Further, the mount member plays a role as a lens hood, and when the mount member is attached to the camera, if used, various other lenses such as an interchangeable lens can be easily and surely exchanged.

Other objects, features and advantages of the present invention will become apparent from the detailed description given below with reference to the accompanying drawings.

[0009]

1 to 3 of the drawings show an embodiment of the conversion lens device of the present invention. As shown in the drawings, the conversion lens device 1 of the present invention is a video camera or a 35 mm camera. And a lens body 3 having a lens group 7 having a required lens configuration, and a mount member 2 screwed to a lens barrel of a photographing lens of a camera body and having an inner circumferential groove 5 in an opening, The pair of button members 9 facing each other in the diameter direction of the lens body 3 are
The button member 9 is provided with an engaging protrusion 23 that is engageable with the inner peripheral groove 5 of the mount member 2.

First, FIG. 1 shows a conversion lens device 1 of the present invention as a wide conversion lens device, and a lens barrel (not shown) of a photographing lens of a camera body such as a video camera or a 35 mm camera. Absent)
The lens main body 3 is detachably connected to the inner peripheral groove 5 portion of the mount member 2 which is screwed and fixed to the screw.

As shown in the figure, the mount member 2 mounted on the camera body such as a video camera or a 35 mm camera is
In particular, as clearly shown in FIG. 4, it has an annular shape, and a screw 4 is cut on one side, and this screw 4 portion is used for photographing a camera body such as a video camera or a 35 mm camera not shown. It is designed so that it can be attached by being screwed onto the screw of the lens barrel of the use lens. An inner peripheral groove 5 is provided in the opening on the other side of the mount member 2, and an annular protrusion 6 that projects inward toward the axial center is formed in the opening of the mount member 2. Such a mounting member 2 is a video camera or 3
Acts as an intermediate ring that doubles as a lens hood for 5 mm cameras, etc., and when attached to the camera body such as a video camera or 35 mm camera, acts to protect the shooting lens of the video camera or 35 mm camera. To do.

The lens body 3 of the conversion lens device 1 of the present invention mounted on the mount member 2 as described above.
Is a lens group 7 having a required lens configuration, and a lens group 7
And a pair of button members 9 that are diametrically opposed to each other and can be pressed inward.
The illustrated lens group 7 is composed of, for example, two concave lenses 11 and 12 and one convex lens 14 as a wide lens. The lenses 11 and 12 and the convex lens 14 are attached to the lens barrel member 18 with a required lens configuration.

The lens group 7 is designed as one of the three wide lens groups consisting of the concave lenses 11 and 12 and the convex lens 14, but of course, in addition to such a lens group, Tele and wide conversion lenses having other suitable lens configurations can be arbitrarily used. A rubber ring 19 made of a natural or synthetic rubber material is provided around the lens barrel 8 and the lens retainer 16 at the opening of the lens body 3 to protect the conversion lens device 1 of the present invention. I am trying.

One of a pair of button members 9 provided diametrically opposite to each other in the lens body 3 is shown in FIGS. 5 to 7, and the same two button members 9 are used so as to face each other. Would be obvious. As shown in the figure, the button member 9 is made of a suitable synthetic resin material such as ABS resin or a suitable material such as a light alloy into a semicircular shape, and has a pressing portion 21 at the center. An arm portion 22 extending in a circular arc shape from the pressing portion 21 to the left and right is provided, and an engaging protrusion 23 that functions as a hook is formed on one side of the arm portion 22 adjacent to the pressing portion 21.

Each engaging protrusion 23 of the button member 9 is shown in FIG.
Is provided so as to extend over a range of about 45 °, so that the pair of button members 9 as a whole covers about 180 °, and engages with the mount member 2 as described later. When being mounted, the mounting member 2 is fitted and mounted over about half of the inner peripheral groove 5 of the inner diameter portion. The tip end portion 24 of each arm portion 22 is made to have a cross section somewhat smaller than the arm portion 22, and a coil spring 25 (FIG. 1) is provided between the tip end portion 24 of the arm portion 22 of the pair of opposing button members 22. It is mounted and pushes both button members 9 diametrically outward via the arm portions 22.

In order to mount the lens body 3 of the conversion lens device 1 of the present invention configured as described above on the mount member 2 attached to the camera body such as a video camera or a 35 mm camera, a pair of these is used. Button member 9
When the button member 9 is released after inserting the lens presser 15 into the mount member 2 by pressing, the engaging protrusions 23 provided on the button member 9 and the inner peripheral groove 5 of the opening of the mount member 2 respectively. The ring-shaped protrusion 6 is engaged and firmly fitted, so that the lens body 3 is connected to the mount member 2. At this time, both the inner and outer side surfaces of the annular protrusion 6 of the mount member 2 are firmly attached to the side surface of the engagement protrusion 23 of the button member 9 and the side surface of the lens barrel member 18 so as to be in contact with each other. The holding power becomes high, and the optical axis is surely attached at the same time as being firmly attached, and the lens body 3 is prevented from falling.

On the contrary, in order to remove the lens body 3 of the conversion lens device 1 of the present invention from the mount member 2 attached to the camera body such as a video camera or a 35 mm camera, the button member 9 is pressed to remove the lens. When the main body 3 is slightly separated from the mount member 2, the engaging projection 23 of the button member 9 is disengaged from the inner peripheral groove 5 and the annular projection 6 of the mount member 2, so that the lens main body 3 is moved to the mount member 2, that is, It can be separated from the camera body.

[0018]

According to the conversion lens device of the present invention thus constructed, for example, a video camera or a 3
First, for the shooting lens of the camera body such as 5 mm camera,
The mount member of the conversion lens device according to the present invention is screwed on and placed, and then the button member of the lens body of the conversion lens device is pressed to engage the protrusion of the button member of the lens body with the opening of the mount member. When the button member is inserted and the button member is released there, the engaging protrusion of the button member is firmly fitted into the inner circumferential groove of the entire circumference of the mount member and firmly attached, so that the lens body can be attached to the video camera or 35 mm The conversion lens device of the present invention is attached to a camera body such as a camera with a strong holding force and is so-called one-touch.
It can be easily attached to a camera body such as a millimeter camera at any position in the rotation direction of 360 °, and the conversion lens device can be similarly removed with a single touch by pressing a button member. Further, the mount member plays a role as a lens hood, and when the mount member is attached to the camera body, if used, various lens exchanges such as an interchangeable lens can be easily and surely effected.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a conversion lens device of the present invention.

FIG. 2 is a side view of the conversion lens device of the present invention shown in FIG.

FIG. 3 is a rear view of the conversion lens device of the present invention shown in FIG.

FIG. 4 is a vertical sectional view of a mount member.

FIG. 5 is a plan view of a button member.

FIG. 6 is a front view of a button member.

FIG. 7 is a vertical sectional view of a button member.

[Explanation of symbols]

 1 Conversion Lens Device 2 Mount Member 3 Lens Main Body 4 Screw 5 Circumferential Groove 6 Annular Protrusion 7 Lens Group 8 Lens Body 9 Button Member 11 Concave Lens 12 Concave Lens 14 Convex Lens 15 Lens Presser 16 Lens Presser 17 Spacer 18 Mirror Body Member 19 Rubber Ring 21 Pressing portion 22 Arm portion 23 Projection portion 24 Tip portion 25 Coil spring

Claims (3)

[Claims] 1. A mount member which is screwed to a lens barrel of a photographing lens of a camera body and has an inner peripheral groove in an opening portion,
A lens body having a lens group forming a required lens configuration, a pair of button members provided on the lens body so as to face each other in the diametrical direction of the lens body, and engageable with an inner circumferential groove portion of the mount member. A conversion lens device, wherein a different engaging protrusion is provided on the button member. 2. The conversion lens device according to claim 1, wherein an annular protrusion protruding inward is formed adjacent to the inner circumferential groove in the opening of the mount member. 3. The button member is formed in a semicircular shape and has a pressing portion at the center, and arm portions extend in a circular arc shape from the pressing portion to the left and right, and adjacent to the pressing portion on one side of each arm portion. 2. The conversion lens device according to claim 1, wherein the engaging protrusion is provided, and a coil spring is provided between the opposing tip ends of the respective arm portions.