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Rapid focusing relay lens and rapid focusing device

A fast, lens technology, applied in the optical field, can solve the problems of slow moving speed, low lens versatility, heavy moving parts, etc., to achieve the effect of low cost, high focusing efficiency, and expanding application scope

Active Publication Date: 2022-03-11
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The moving parts of the first three focusing methods are heavy and easy to shake, and the moving speed is also slow
Although the fourth fast focusing method has no moving parts, it can also focus quickly, but the effective aperture of the liquid lens is very small, which is not suitable for lenses with long focal length or large aperture, and the liquid lens is designed in the lens. Low versatility of lenses and very high cost of liquid lenses

Method used

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  • Rapid focusing relay lens and rapid focusing device
  • Rapid focusing relay lens and rapid focusing device
  • Rapid focusing relay lens and rapid focusing device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] like Figure 1-3 As shown, a fast focusing relay lens mainly includes a lens barrel 1, a movable lens group 2 and a fixed lens group 3 that are arranged in the lens barrel 1 in sequence along the optical axis direction from front to back and are all positive refractive powers, and A linear motor 4 connected between the lens barrel 1 and the movable mirror group 2 for driving the movable mirror group 2 to move linearly along the optical axis;

[0026] The fixed mirror group 3 is fixedly installed in the lens barrel 1, and the movable mirror group 2 is installed in the linear motor 4. The movable mirror group 2 and the fixed mirror group 3 are completely identical and symmetrical lens groups, and the movable mirror group 2 and fixed lens group 3 are composed of achromatic and aplanatic lenses. Identical means same material, same curvature and same thickness.

[0027] like figure 1 As shown, the linear motor 4 is a hollow motor driven by electricity that can drive the m...

Embodiment 2

[0035] like Figure 1-3 Shown, a kind of fast focus device, comprises the fast focus relay lens described in embodiment one, the imaging lens 5 that is fixedly installed and connected to the front end of the fast focus relay lens, the lens mount that is fixedly connected to the rear end of the fast focus relay lens 6. An image sensor 7 and a processing module arranged in the lens holder 6;

[0036] The focal plane position of the fixed mirror group 3 coincides with the photoelectric sensing surface of the image sensor 7, and the processing module is connected with the image sensor 7 and the linear motor 4 respectively, and can be controlled according to the clarity of the image collected by the image sensor 7 The linear motor 4 acts to drive the movable lens group 2 to move along the optical axis for focusing.

[0037] The working principle and process of this embodiment are as follows:

[0038] Wherein the focal point of fixed mirror group 3 falls on the photoelectric sensi...

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Abstract

The invention relates to a quick focusing relay lens and a quick focusing device. Comprising a lens cone, a movable lens group, a fixed lens group and a linear motor. The fixed lens group is fixedly installed in the lens barrel, the movable lens group is installed in the linear motor, the movable lens group and the fixed lens group are lens groups which are completely the same and are symmetrical front and back, and both the movable lens group and the fixed lens group are composed of achromatic lenses and spherical lenses. The optical assembly capable of keeping collimated light rays between the two lens sets is used for being installed between an imaging lens and a lens seat provided with an image sensor to form the rapid focusing device, the fixed lens set is kept fixed, the movable lens set can move along the optical axis relative to the fixed lens set, and therefore focusing can be rapidly completed at a time, and the focusing efficiency is improved. The system is high in focusing efficiency and low in cost, can be matched with a camera and a lens with a standard definition interface for use, and greatly expands the application range.

Description

technical field [0001] The invention relates to the field of optics, in particular to a fast focusing relay lens and a fast focusing device. Background technique [0002] In the field of optical imaging, how to quickly achieve autofocus is a problem that all imaging systems will face, especially the change of the working surface of the telephoto lens in industrial cameras when working at a close working distance, and the need for fast focusing in iris recognition. At present, the mainstream methods in the market are as follows: 1. Install a VCM motor (voice coil motor) on the camera chip end, the lens does not move, and autofocus is achieved by changing the distance between the chip and the lens. This is an autofocus camera. 2. Inside the lens, the lens group is driven by a motor to move linearly along the optical axis to change the distance between the lens group and the chip. This is an optical lens that can automatically focus. 3. Install a linear electric platform such ...

Claims

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Application Information

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IPC IPC(8): G02B7/09G02B7/10G02B13/00G02B13/18G03B13/36
CPCG02B7/09G02B7/10G02B13/00G02B13/18G02B13/0095G03B13/36
Inventor 黄心铭王敏
Owner FUJIAN NORMAL UNIV