CN211149045U - Optical fixed focus structure and ultra-wide angle fisheye camera with same - Google Patents

Abstract

The utility model belongs to the technical field of camera lens, in particular to an optical fixed focus structure and a super wide angle fisheye camera with the same, wherein the optical fixed focus structure comprises a front lens group and a rear lens group which are positioned in a lens cone, and a photosensitive device positioned behind the front lens group and the rear lens group; the front lens group and the rear lens group are driven by a driving mechanism to move relatively, and a diaphragm assembly with the aperture being 4.9-0.86 variable is arranged between the front lens group and the rear lens group; due to the adoption of the special structural design, the lens has the advantages of good performance, small volume, light weight, low cost, elimination of stray light and glare, and high positioning precision in the repeated opening and closing process of the diaphragm diameter.

Description

Optical fixed focus structure and ultra-wide angle fisheye camera with same

Technical Field

The utility model belongs to the technical field of the camera lens, concretely relates to optics tight focus structure and have its super wide angle fisheye camera.

Background

A fisheye lens is a lens having a focal length of 16mm or less and a viewing angle close to or equal to 180 °. The fish-eye lens is an extreme wide-angle lens, is commonly known as a fish-eye lens, and is named after that, in order to enable the lens to achieve the maximum shooting visual angle, the front lens of the shooting lens is very short in diameter and protrudes towards the front of the lens in a parabolic shape, and is very similar to fish eyes.

The high-quality fisheye lens is expensive, large in size, heavy, complex in structure and difficult in manufacturing process, such as 8mmF1.6 in Orlinbas, and the low-cost fisheye lens is poor in shooting effect, poor in aperture diameter opening and closing positioning accuracy and high in stray light and glare.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome not enough among the prior art, provide an optics tight focus structure, make camera lens small, light in weight, it is with low costs, eliminate stray light and glare, and the repeated in-process positioning accuracy that opens and shuts of diaphragm diameter is high.

In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:

an optical fixed focus structure comprises a front lens group and a rear lens group which are positioned in a lens barrel, and a photosensitive device positioned behind the front lens group and the rear lens group;

the front lens group and the rear lens group are driven by a driving mechanism to move relatively, and a diaphragm assembly with the aperture being 4.9-0.86 variable is arranged between the front lens group and the rear lens group.

Preferably, the lens barrel comprises a main barrel and a rear lens group sliding ring which are concentrically arranged, the front lens group is fixed on the main barrel, and the rear lens group is fixed on the rear lens group sliding ring;

the side wall of the main cylinder is provided with a waist groove which is trisected along the circumferential direction of the main cylinder, a guide sleeve is arranged in the waist groove, the side surface of the rear lens group sliding ring is trisected along the circumferential direction of the rear lens group sliding ring into M2 screw holes, and guide nails penetrate through the guide sleeve arranged in the waist groove, are fixed in the screw holes arranged on the rear lens group sliding ring and move back and forth along the waist groove.

Preferably, the driving mechanism comprises a group of precise directional multi-thread to realize the back-and-forth movement of the rear lens group, the focusing hand wheel fixes the female thread to limit the rotation angle of the female thread, and the bayonet base and the depth of field ring axially limit the female thread.

Preferably, the diaphragm assembly is arranged on the front lens group, and an F2.8-F22 seventh-grade diaphragm is designed;

the diaphragm hand wheel drives the diaphragm moving piece to rotate through the diaphragm deflector rod and drives the diaphragm blades to move along the linear groove track, so that the diaphragm opening and closing action is realized.

The utility model also provides a super wide angle flake camera of having above-mentioned optics tight focus structure.

Compared with the prior art, the utility model discloses following technological effect has:

the utility model provides an optics tight focus structure can be used to 4mm F2.8 super wide angle fisheye camera, owing to adopted special structural design for the performance of camera lens is good, and is small, light in weight, and is with low costs, has eliminated stray light and glare, and the repeated in-process positioning accuracy that opens and shuts of diaphragm diameter is high.

Other features and advantages of the present invention will be described in detail in the following detailed description.

Drawings

FIG. 1 is a schematic view of a fixed-focus 4mm F2.8 ultra-wide fisheye camera provided by the present invention;

fig. 2 is a cross-sectional view of an optical fixed focus structure of a camera lens provided by the present invention;

FIG. 3 is a partial cross-sectional view of an optical focusing structure of the camera lens of FIG. 2;

FIG. 4 is a schematic structural diagram of a middle aperture system of the present invention;

FIG. 5 is a schematic view of the structure of the middle light barrier of the present invention;

fig. 6 is a schematic view of the sliding ring of the rear lens group of the present invention;

fig. 7 is a schematic view of a middle bayonet base of the present invention;

the reference numbers in the figures illustrate: 1-lens, 2-camera body, 10-lens cone, 11-main barrel, 111-waist groove, 112-guide sleeve, 12-rear lens group sliding ring, 121-M2 screw hole, 122-guide nail, 20-front lens group, 30-rear lens group, 40-diaphragm assembly, 41-aperture hand wheel, 42-diaphragm deflector rod, 43-diaphragm moving piece, 44-diaphragm blade, 45-diaphragm fixed piece, 46-diaphragm shifting fork, 461-jack, 50-focusing hand wheel, 51-female thread, 52-bayonet base, 53-depth of field ring, and 54-male thread.

Detailed Description

In order to make the technical means, creation characteristics, achievement purpose and efficacy of the utility model easy to understand and understand, the utility model is further clarified by combining the specific drawings.

It should be noted that, in the present invention, when an element is referred to as being "fixed" to another element, it may be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Fig. 1 shows the utility model provides a fixed focus 4mm F2.8 ultra-wide fisheye camera, wherein, 1 is the camera lens, and 2 is the camera body.

With reference to fig. 2-7, the present invention further provides an optical fixed focus structure for the 4mm F2.8 ultra-wide fisheye camera, wherein the optical fixed focus structure includes a front lens group 20 and a rear lens group 30 located in the lens barrel 10, and a light sensing device located behind the front lens group 20 and the rear lens group 30; the front lens group 20 and the rear lens group 30 are driven by a driving mechanism to move relatively, so that accurate focusing is realized and clear imaging is realized on the photosensitive device; a diaphragm assembly 40 with the aperture being 4.9-0.86 is arranged between the front lens group 20 and the rear lens group 30.

The utility model discloses in, back battery of lens 30 through mathematical operation, satisfy its optical parameter, as follows:

the lens cone 10 comprises a main cylinder 11 and a rear lens group sliding ring 12 which are concentrically arranged, a front lens group 20 is fixed on the main cylinder 11, and a rear lens group 30 is fixed on the rear lens group sliding ring 12;

the side wall of the main barrel 11 is provided with a waist groove 111 trisected along the circumferential direction of the main barrel, specifically, the width of the waist groove 111 is 4mm, a guide sleeve 112 is arranged in the waist groove 111, the side surface of the rear mirror group slide ring 12 trisected along the circumferential direction of the rear mirror group slide ring is provided with M2 screw holes 121, and guide nails 122 penetrate through the guide sleeve 112 arranged in the waist groove 111, are fixed in the screw holes 121 formed in the rear mirror group slide ring 12, and move back and forth along the waist groove 111.

The utility model discloses in, actuating mechanism realize rear lens group 30 back-and-forth movement including the directional bull thread of a set of precision, the fixed female thread 51 of focusing hand wheel 50, spacing its rotation angle, bayonet socket base 52 and depth of field ring 53 axial are spacing female thread 51. Specifically, the multi-start thread comprises a female thread 51 and a male thread 54 which are matched with each other, and one side of the bayonet base 52, which is close to the female thread 51, is provided with an arc-shaped limiting groove 521.

In the present invention, the diaphragm assembly 40 is disposed on the front lens group 20, and seven-level diaphragms of F2.8-F22 are designed; the diaphragm hand wheel 41 drives the diaphragm moving piece 43 to rotate through the diaphragm deflector rod 42 and drives the diaphragm blade 44 to move along the linear groove track, so that the diaphragm opening and closing action is realized. Specifically, the diaphragm moving plate 43 is rotatably disposed on the diaphragm fixing plate 45, the diaphragm hand wheel 41 is fixed with a diaphragm shifting fork 46, a lower end of the diaphragm shifting fork 46 is provided with an insertion hole 461 for inserting one end of the diaphragm shifting lever 42, and the diaphragm hand wheel 41 rotates to drive the diaphragm shifting lever 42 to rotate. Through the structural design, the diaphragm diameter precision is high when the diaphragm is repeatedly opened and closed.

The utility model discloses in, in order to eliminate the parasitic light and the glare of this camera lens, the space ring adopts the extinction line, and partly stray light and glare in the camera lens can be eliminated in sawtooth pattern extinction design, and I shape and L type extinction design increase the surface treatment technique of mute light.

The utility model discloses in, the diaphragm gear that opens and shuts is through accurate mathematical operation to satisfy following optical parameter:

the utility model provides an optics of this camera lens is burnt structure surely adopts the design of embedding thin wall rotator, and the material adopts aluminium 6061 and 5056 to mix the use, adds the handle on the focusing hand wheel 50, and the design of diaphragm assembly 40 is on preceding battery of lens 20, has simplified the structure, is showing dwindle the volume of this optics is burnt structure surely for whole optics is burnt structure surely has the advantage of small, light in weight and easy operation.

Through the utility model provides an optics tight focus structure of this camera lens for the small in size of camera, light in weight, focusing is accurate, and the angle of vision can reach 210.

The foregoing shows and describes the general principles, essential features, and features of the invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the description of the above embodiments and the description is only illustrative of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the present invention, and these changes and modifications are all within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (5)

1. An optical fixed focus structure is characterized by comprising a front lens group and a rear lens group which are positioned in a lens barrel, and a photosensitive device positioned behind the front lens group and the rear lens group;

the front lens group and the rear lens group are driven by a driving mechanism to move relatively, and a diaphragm assembly with the aperture being 4.9-0.86 variable is arranged between the front lens group and the rear lens group.

2. The optical fixed focus structure of claim 1, wherein the lens barrel comprises a main cylinder and a rear lens group sliding ring which are concentrically arranged, the front lens group is fixed on the main cylinder, and the rear lens group is fixed on the rear lens group sliding ring;

the side wall of the main cylinder is provided with a waist groove which is trisected along the circumferential direction of the main cylinder, a guide sleeve is arranged in the waist groove, the side surface of the rear lens group sliding ring is trisected along the circumferential direction of the rear lens group sliding ring into M2 screw holes, and guide nails penetrate through the guide sleeve arranged in the waist groove, are fixed in the screw holes arranged on the rear lens group sliding ring and move back and forth along the waist groove.

3. The optical fixed-focus structure as claimed in claim 1, wherein the driving mechanism comprises a set of precisely oriented multi-start threads for moving the rear lens group forward and backward, a focusing hand wheel for fixing the female threads and limiting the rotation angle thereof, and a bayonet base and a depth ring for axially limiting the female threads.

4. The optical fixed-focus structure as claimed in claim 1, wherein the diaphragm assembly is disposed on the front lens group, and is designed as an F2.8-F22 seventh aperture;

the diaphragm hand wheel drives the diaphragm moving piece to rotate through the diaphragm deflector rod and drives the diaphragm blades to move along the linear groove track, so that the diaphragm opening and closing action is realized.

5. An ultra-wide angle fisheye camera, characterized in that the camera has an optical fixed focus structure as claimed in any one of claims 1 to 4.

Images