Patent Application
20150241663
Pursuant to 35 U.S.C. ยง119 and the Paris Convention Treaty, this application claims the benefit of Chinese Patent Application No. 201410063263.7 filed Feb. 22, 2014, the contents of which are incorporated herein by reference. Inquiries from the public to applicants or assignees concerning this document or the related applications should be directed to: Matthias Scholl P.C., Attn.: Dr. Matthias Scholl Esq., 245 First Street, 18th Floor, Cambridge, Mass. 02142.
1. Field of the Invention
The invention relates to an optical focusing system.
2. Description of the Related Art
When photographing objects at a short or long distance, conventional camera lenses need to move as a whole for a long distance when focusing. For example, when the camera lens is applied to a high definition video monitoring at a wide angle, the focusing distance is greater than 0.5 mm, which causes a long focusing time and fuzzy pictures. When the camera lens is applied to smartphones, the focusing distance is between 0.2 and 0.5 mm, which requires large size of focusing components in the smartphones thereby increasing the thickness of the phones and reducing the focusing accuracy.
In view of the above-described problems, it is one objective of the invention to provide an optical focusing system that is thin, lightweight, and highly practicable. The optical focusing system features high definition focusing and can be applied to a camera of a smartphone and high definition video monitoring.
To achieve the above objective, in accordance with one embodiment of the invention, there is provided an optical focusing system, comprising a focusing lens group, a fixed lens group, and an imaging surface. The focusing lens group is disposed at a forefront of an object space, or a rearmost of an image space, or between lenses of the fixed lens group.
In a class of this embodiment, the focusing lens group and the fixed lens group comprise spherical lens or nonspherical lens.
In a class of this embodiment, an optical filter is disposed in front of the imaging surface and faces the object face.
In a class of this embodiment, the focusing lens group comprises one or more lenses.
In a class of this embodiment, the fixed lens group comprises one or more lenses.
Advantages according to embodiments of the invention are summarized as follows:
1. The moving distance of the lens of the optical focusing system is within 0.10 mm for focusing.
2. The optical focusing system can be applied to a monitoring camera for fast focusing and high definition imaging.
3. The optical focusing system can be applied to a smartphone thereby achieving thin appearance and accurate focusing thereof.
The invention is described hereinbelow with reference to the accompanying drawings, in which:
For further illustrating the invention, experiments detailing an optical focusing system are described below. It should be noted that the following examples are intended to describe and not to limit the invention.
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Optionally, the focusing lens group can be disposed between lenses of the fixed lens group.
In the optical focusing system, an optical filter 4 is disposed in front of the imaging surface 3 and faces the object face. The focusing lens group 1 and the fixed lens group 2 comprise spherical lens or nonspherical lens.
The optical focusing system of the invention features short focusing distant, quick and accurate high definition focusing, small size, and a wide range of practicality.
While particular embodiments of the invention have been shown and described, it will be obvious to those skilled in the art that changes and modifications may be made without departing from the invention in its broader aspects, and therefore, the aim in the appended claims is to cover all such changes and modifications as fall within the true spirit and scope of the invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201410063263.7 | Feb 2014 | CN | national |
