JP3719528B2 - Conversion lens device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a conversion lens device such as an auxiliary lens device, and more particularly to a conversion lens device for a video camera or a 35 mm camera.
[0002]
[Prior art]
In recent years, a large number of video cameras and 35 mm cameras have been built, and in particular, such video cameras are also used for shooting at close positions, shooting at a telephoto or wide angle range, as with 35 mm cameras. There is a growing demand for conversion lens devices. Accordingly, tele and wide conversion lenses that are individually adapted to meet such demands are manufactured and marketed.
[0003]
[Problems to be solved by the invention]
At the same time, such tele and wide conversion lenses must be individually attached to the camera lens barrel of the camera body by screwing or the like, and such screw-on conversion lenses are troublesome to mount and remove. There are problems such as being bothersome and cumbersome.
[0004]
Also, there is a hook on the mount, a button on the lens frame, and a screw-shaped protrusion formed on the surface of this hook is screwed into the lens barrel screw of the camera lens by operating the button. There is a conversion lens that can be engaged and mounted. However, such a conversion lens must be mounted in the correct mounting position, and the holding force is weak. Defects such as easy to do are seen.
[0005]
Accordingly, an object of the present invention is to solve such problems in the prior art, and can be easily attached with a strong holding force without being aligned with the camera body, and there is no fear of dropping. An object of the present invention is to provide a conversion lens device capable of exchanging lenses.
[0006]
[Means for Solving the Problems]
In order to achieve the above-described object, according to the present invention, a conversion lens device includes a mount member screwed to a lens barrel of a photographing lens of a camera body and having an inner peripheral groove in an opening, and a required lens. And a pair of button members provided on the lens body so as to oppose each other in the diameter direction of the lens body and engageable with an inner circumferential groove portion of the mount member. A protrusion is provided on the button member, the button member is formed in a semicircular shape, has a pressing portion in the center, and an arm portion extends in a circular arc shape from side to side from the pressing portion, and is pressed to one side of each arm portion. An engaging projection is provided adjacent to the portion, and a coil spring is provided between the front ends of each arm portion facing each other.
[0007]
[Action]
The conversion lens device according to the present invention configured as described above is mounted on the photographing lens of the camera body by first screwing and mounting the mount member, and then pressing the button member of the lens body while pressing the mount member. Insert the engagement protrusion of the button member of the lens body into the opening, and release the button member there. This engagement protrusion of the button member fits firmly in the inner peripheral groove of the entire circumference of the mount member and is strong. Since the lens body can be attached to the camera body with a strong holding force, the conversion lens device can be attached to the camera body at any position of 360 ° in the rotation direction by one touch, and such a conversion lens is also available. Removal of the device can be performed with one touch by pressing the button member as easily as mounting. In addition, the mount member serves as a lens hood, and when the mount member is attached to the camera, it can be used to exchange various other lenses easily and reliably like an interchangeable lens. 0008
Other objects, features and advantages of the present invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.
[0009]
【Example】
FIGS. 1 to 3 of the drawings show an embodiment of the conversion lens device of the present invention. As shown, the conversion lens device 1 of the present invention is a camera body such as a video camera or a 35 mm camera. The mount member 2 is screwed to the lens barrel of the photographing lens and has an inner peripheral groove 5 at the opening, and the lens body 3 having a lens group 7 having a required lens configuration. A pair of button members 9 are provided on the lens body 3 so as to face each other in the diametrical direction, and an engagement protrusion 23 that can be engaged with the inner peripheral groove 5 of the mount member 2 is provided on the button member 9.
[0010]
First, FIG. 1 shows a conversion lens device 1 according to the present invention as a wide conversion lens device, which is a lens barrel (not shown) of a photographing lens of a camera body such as a video camera or a 35 mm camera. The lens body 3 is detachably connected to the inner circumferential groove 5 of the mount member 2 fixed by being screwed to the screw as shown in the figure.
[0011]
As shown in the drawing, the mount member 2 attached to the camera body such as a video camera or a 35 mm camera has an annular shape as shown in FIG. 4, and a screw 4 is cut on one side. The screw 4 is attached to a screw of a lens barrel of a photographing lens of a camera body such as a video camera or a 35 mm camera (not shown). An inner peripheral groove 5 is provided in the opening on the other side of the mount member 2, and an annular protrusion 6 protruding inward toward the axial center is formed in the opening of the mount member 2. Such a mounting member 2 acts as an intermediate ring that also serves as a lens hood for a video camera, 35 mm camera, etc., and if mounted on a camera body such as a video camera, 35 mm camera, etc., the video camera, 35 mm camera, etc. It acts to protect the photographic lens.
[0012]
The lens body 3 of the conversion lens device 1 of the present invention attached to such a mount member 2 is opposed to a lens group 7 having a required lens configuration and a lens barrel 8 holding the lens group 7 in the diameter direction. And a pair of button members 9 that can be pressed inwardly. The illustrated lens group 7 includes, for example, two concave lenses 11 and 12 and one convex lens 14 as a wide lens, and is a concave lens formed by inner and outer lens holders 15 and 16 and an intermediate spacer 17. 11, 12 and the convex lens 14 are attached to the barrel member 18 with a required lens configuration.
[0013]
The lens group 7 is designed as one of a three-lens wide lens group in which the concave lenses 11 and 12 and the convex lens 14 are combined. Of course, in addition to such a lens group, other appropriate lenses may be used. Tele- and wide-conversion lenses with various lens configurations can be used arbitrarily. In addition, a rubber ring 19 made of a natural or synthetic rubber material is provided around the lens barrel 8 and the lens retainer 16 in the opening of the lens body 3 to protect the conversion lens device 1 of the present invention. I am doing so.
[0014]
One of a pair of button members 9 provided to face the diametrical direction of the lens body 3 is shown in FIGS. 5 to 7, and it is clear that the same two button members 9 are used facing each other. Let's go. As shown in the drawing, the button member 9 is made in a semicircular shape from an appropriate synthetic resin material such as ABS resin, or an appropriate material such as a light alloy, and has a pressing portion 21 in the center. Arm portions 22 extending in a circular arc shape are provided on the left and right from the pressing portion 21, and an engaging projection portion 23 that acts as a hook is formed on one side of the arm portions 22 adjacent to the pressing portion 21.
[0015]
Each engagement protrusion 23 of the button member 9 is provided so as to extend over a range of about 45 ° as clearly shown in FIG. 6, and therefore the entire pair of button members 9 is about 180 °. As will be described later, when engaged with the mount member 2, it is fitted and attached over about half of the inner peripheral groove 5 of the inner diameter portion of the mount member 2. The distal end portion 24 of each arm portion 22 is formed to have a slightly smaller cross section than the arm portion 22, and a coil spring 25 (FIG. 1) is provided between the distal end portions 24 of the arm portions 22 of the pair of button members 22 facing each other. The two button members 9 are pressed outward in the diametrical direction through the arm portion 22.
[0016]
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, the pair of button members 9 When the button member 9 is released after the lens presser 15 portion is inserted into the mount member 2 while pressing the, the engaging projections 23 provided on the button member 9 and the inner peripheral groove 5 of the opening of the mount member 2 are formed. The lens main body 3 is connected to the mount member 2 by engaging with the annular protrusion 6 and fitting firmly. At this time, both the inner and outer side surfaces of the annular protrusion 6 of the mount member 2 are attached so as to be firmly in contact with and engaged with the side surface of the engagement protrusion 23 of the button member 9 and the side surface of the lens barrel member 18. The holding force is increased and the lens body 3 is securely attached, and at the same time, the optical axis is reliably aligned, and the lens body 3 is prevented from falling.
[0017]
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 lens body 3 is pushed while pressing the button member 9. If it is slightly pulled away 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 body 3 is removed from the mount member 2, that is, the camera body. Can be separated.
[0018]
【The invention's effect】
According to the conversion lens device of the present invention configured as described above, for example, first, a mount member of the conversion lens device of the present invention is screwed onto a photographing lens of a camera body such as a video camera or a 35 mm camera. Then, while pressing the button member of the lens body of the conversion lens device, the engaging projection of the button member of the lens body is inserted into the opening of the mount member, and when the button member is released there, Since this engagement protrusion fits firmly in the inner peripheral groove of the entire circumference of the mount member and is firmly attached, the lens body is attached to a camera body such as a video camera or a 35 mm camera with a strong holding force, The conversion lens device of the present invention can be rotated to a camera body such as a video camera or a 35 mm camera with one-touch operation. It can easily be attached at any position counter 360 °, also, it can be performed with one touch by pressing removal equally simple button member conversion lens system. Further, the mount member serves as a lens hood, and when the mount member is attached to the camera body, it can be used to exchange various lenses easily and reliably like an interchangeable lens.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a conversion lens device according to 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. 1;
FIG. 4 is a longitudinal 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 longitudinal sectional view of a button member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Conversion lens apparatus 2 Mount member 3 Lens main body 4 Screw 5 Circumferential groove 6 Annular projection 7 Lens group 8 Lens barrel 9 Button member 11 Concave lens 12 Concave lens 14 Convex lens 15 Lens presser 16 Lens presser 17 Spacer 18 Lens barrel member 19 Rubber Ring 21 Press part 22 Arm part 23 Projection part 24 Tip part 25 Coil spring

Claims (2)

A mount member that is screwed to the lens barrel of the photographing lens of the camera body and has an inner peripheral groove in the opening, and a lens body that has a lens group that forms a required lens configuration, and is arranged in the diameter direction of the lens body. A pair of button members are provided on the lens body so as to face each other, and an engaging protrusion that can be engaged with an inner circumferential groove portion of the mount member is provided on the button member. The button member is formed in a semicircular shape. There is a pressing portion in the center, and an arm portion extends in a circular arc shape from side to side from the pressing portion, and an engaging protrusion is provided adjacent to the pressing portion on one side of each arm portion, and each arm portion faces each other. A conversion lens device characterized in that a coil spring is provided between tip portions .   2. The conversion lens device according to claim 1, wherein an annular protrusion that protrudes inward is formed adjacent to the inner circumferential groove at the opening of the mount member.

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