Adjustable optical back focus adapter ring device

Abstract

The utility model discloses an adapter ring device of an adjustable optical back focus structure. The adapter ring device comprises a machine body bayonet, a main body connecting seat, an optical assembly, a double-thread main body, a back focus focusing ring, a lens seat, a focusing locking screw and a movable guide nail. The machine body bayonet is connected with the main body connecting base through a screw, the main body connecting base is connected with the double-thread main body through a screw, the optical assembly is connected with the double-thread main body through a thread, the rear focus focusing ring is connected with the double-thread main body through a thread, and a movable guide nail is connected between the rear focus focusing ring and the optical assembly. The lens seat is connected with the double-thread main body through a screw, and the rear focus focusing ring is provided with a focusing locking screw. According to the utility model, the rear focus focusing ring and the optical assembly synchronously rotate on the double-thread main body, so that the optical assembly moves back and forth along the axis direction of the adapter ring, the distance between the optical assembly and the image sensor is adjusted, and a clear image is obtained.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of adjustable optical back focal adapter ring devices. BACKGROUND

[0002] In the field of photography, people often use adapter ring to connect lenses with different bayonet and camera body. Sometimes, due to the difference between lens image field and camera body size, adapter ring containing magnifying lens or focusing lens is needed to realize the unity of lens image field and image sensor size. At the same time, due to environmental temperature changes, long-term wear of bayonet, internal vibration of the machine, different lens and camera body matching error and other factors, the back focal length of the camera will deviate, resulting in unclear imaging. SUMMARY

[0003] The utility model provides a kind of adjustable optical back focal adapter ring device, which is convenient and reliable to use, easy to operate, can solve the problem of unclear imaging caused by back focal deviation after camera lens installation, and has practicality and wide applicability.

[0004] To solve the above problems, the utility model adopts the following technical scheme: an adjustable optical back focal structure adapter ring device, comprising a camera body bayonet, a main body connecting seat, an optical assembly, a double-thread main body, a back focal focusing ring, a lens seat, a focusing locking screw and a moving guide pin. The camera body bayonet is connected to the main body connecting seat by screws, the main body connecting seat is connected to the double-thread main body by screws, the optical assembly is connected to the double-thread main body by threads, the back focal focusing ring is connected to the double-thread main body by threads, a moving guide pin is connected between the back focal focusing ring and the optical assembly, the lens seat is connected to the double-thread main body by screws, and the back focal focusing ring is provided with a focusing locking screw. The back focal focusing ring and the optical assembly rotate synchronously on the double-thread main body, which moves the optical assembly forward and backward along the adapter ring axis, adjusts the distance between the optical assembly and the image sensor, and achieves clear imaging.

[0005] The inner and outer threads are arranged in the double-thread main body, the optical assembly is provided with an outer thread matched with the inner thread of the double-thread main body, the back focal focusing ring is provided with an inner thread matched with the outer thread of the double-thread main body, the double-thread main body is provided with an arc-shaped hole, the moving guide pin connects the back focal focusing ring and the optical assembly through the arc-shaped hole, the arc size of the arc-shaped hole controls the rotation stroke of the back focal focusing ring, and the optical assembly can be moved forward and backward along the adapter ring axis by rotating the back focal focusing ring, so as to adjust the back focal length and achieve clear imaging.

[0006] The back focal focusing ring is provided with a focusing locking screw, which can be locked after adjusting the back focal length accurately to prevent the back focal length from deviating again due to accidental touch.

[0007] The adjustable optical back focal adapter ring device has the advantages of convenient and reliable use, simple operation, solution of the problem of back focal offset of an optical adapter ring and unclear imaging, and practicality and wide applicability. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below, but are not a limitation on the protection scope of the present application.

[0009] 1、 Fig. 1 is a structural schematic view of the present application;

[0010] 2、 Fig. 2 is an optical assembly of the present application;

[0011] 3、 Fig. 3 is a double-threaded main body of the present application;

[0012] 4、 Fig. 4 is a back focal focusing ring of the present application;

[0013] Wherein the names of each part are as follows: 1 is a body bayonet; 2 is a main body connecting seat; 3 is an optical assembly; 4 is a double-threaded main body; 5 is a back focal focusing ring; 6 is a lens seat; 7 is a focusing locking screw; 8 is a moving guide pin; 9 is an optical assembly external thread; 10 is a double-threaded main body internal thread; 11 is a double-threaded main body external thread; 12 is an arc-shaped hole; 13 is a back focal focusing ring internal thread; 14 is a focusing locking screw mounting hole; 15 is a moving guide pin mounting hole; 16 is a moving guide pin mounting hole. DETAILED DESCRIPTION

[0014] Referring to Figs. 1 to 4 The adjustable optical back focal adapter ring device shown in the figure comprises a body bayonet, a main body connecting seat, an optical assembly, a double-threaded main body, a back focal focusing ring, a lens seat, a focusing locking screw, a moving guide pin and the like.

[0015] The body bayonet 1 is connected with the main body connecting seat 2 by screws, the main body connecting seat 2 is connected with the double-threaded main body 4 by screws, the optical assembly 3 is connected with the double-threaded main body 4 by threads, the back focal focusing ring 5 is connected with the double-threaded main body 4 by threads, the back focal focusing ring 5 is connected with the optical assembly 3 through the moving guide pin 8, the double-threaded main body 4 is provided with an arc-shaped hole 12 on the side surface, and the moving guide pin 8 passes through the arc-shaped hole 12; the focusing locking screw 7 is installed on the back focal focusing ring 5 through the focusing locking screw mounting hole 14;

[0016] If the clear imaging cannot be obtained after the focusing ring on the lens is adjusted to the limit after the lens and the body are connected by the device, the rear focus can be adjusted by the device.

[0017] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any change or replacement without creative labor should be covered in the protection scope of the present application.

Claims

1. An adjustable optical back focus adapter device, characterized in that: The system includes a body mount, a main body connector, an optical component, a double-threaded main body, a rear focus ring, a lens mount, a focus locking screw, and a movable guide pin. The body mount and the main body connector are connected by screws, the main body connector and the double-threaded main body are connected by screws, the optical component is connected to the double-threaded main body by threads, the rear focus ring is connected to the double-threaded main body by threads, a movable guide pin connects the rear focus ring and the optical component, the lens mount and the double-threaded main body are connected by screws, and a focus locking screw is installed on the rear focus ring.

2. The adjustable optical back focus adapter device according to claim 1, characterized in that: The dual-threaded body has internal and external threads respectively, and the optical components and back focus ring mounted on the internal and external threads can rotate synchronously.

3. The adjustable optical back focus adapter device according to claim 1, characterized in that: The double-threaded body has an arc-shaped hole on its side.

4. The adjustable optical back focus adapter device according to claim 1, characterized in that: The rear focus ring is equipped with a focus locking screw.

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