Thermal compensation to adjust camera lens focus
Active Publication Date: 2017-03-02
GOPRO
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AI Technical Summary
Benefits of technology
The patent text describes a camera mount system that compensates for changes in focus in a camera lens system due to changes in temperature. The system includes a camera lens mount and a collet that connects the lens mount to the camera lens barrel. The collet is made of a material that changes in length with temperature, which compensates for changes in the lens mount and the lens barrel to keep the image plan approximately stationary and in focus in response to temperature change. The technical effect of this system is to improve the focus of the camera lens system and ensure consistent performance and yield.
Problems solved by technology
Additionally, the lens optical elements inside the lens barrel can increase or decrease the focal length of the lens due to changes in temperature.
This affects the focus of the lenses and compromises performance and yield.
Method used
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[0008]The figures and the following description relate to preferred embodiments by way of illustration only. It should be noted that from the following discussion, alternative embodiments of the structures and methods disclosed herein will be readily recognized as viable alternatives that may be employed without departing from the principles of what is claimed.
[0009]Reference will now be made in detail to several embodiments, examples of which are illustrated in the accompanying figures. It is noted that wherever practicable similar or like reference numbers may be used in the figures and may indicate similar or like functionality. The figures depict embodiments of the disclosed system (or method) for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles described herein.
Configuration Overview
[0010]D...
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An integrated image sensor and a camera lens apparatus comprising of an image sensor substrate, a camera lens mount, a lens barrel, a lens optical assembly and a collet. The camera lens mount comprises a first material, the lens barrel comprises a second material and the collet comprises a third material, the first, second and third materials change in length with a temperature change according to their respective coefficient of thermal expansion. The lens optical assembly comprises optical elements that cause a change in focal length with a temperature change according to a thermal optical coefficient. The first, second, and third material, the lengths of the camera lens mount, lens barrel, and collet, and the thermal optical coefficient of the lens optical assembly are such that the image plane is approximately stationary relative to the sensor surface in response to the temperature change.
Description
BACKGROUND[0001]Technical Field[0002]This disclosure relates to a camera mount system, and more specifically, to a passive thermal compensation mechanism for adjusting focus in a camera lens system.[0003]Description of the Related Art[0004]In an integrated image sensor and camera lens system a lens mount is connected to a lens barrel via a collet such that the image sensor is aligned to maintain lens focus. The materials used for the camera lens mount, lens barrel, and collet may expand or contract due to changes in temperature of the lens assembly. Additionally, the lens optical elements inside the lens barrel can increase or decrease the focal length of the lens due to changes in temperature. The expansion or contraction of any of the components, along with the change in the focal length may cause the positions of the lenses to shift along the optical axis, thus altering the distance between the lenses and the image sensor. This affects the focus of the lenses and compromises perf...
Claims
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Login to View More IPC IPC(8): G02B7/02H04N5/225
CPCG02B7/028H04N5/2253H04N5/2254H04N23/55
Inventor FENG, CHEN
Owner GOPRO