Three-pole tilt control system for camera module
a control system and camera module technology, applied in the field of electronic devices, can solve the problems of high cost, high manufacturing cost, and high complexity of camera module manufacturing, and achieve the effects of reducing optical tilt, reducing manufacturing steps, and relaxing geometric and assembly tolerances of components
Inactive Publication Date: 2013-03-21
NANCHANG O FILM OPTICAL ELECTRONICS TECH CO LTD
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Benefits of technology
The solution effectively minimizes optical tilt and improves image quality by reducing the number of tolerance requirements, making it easier to achieve accurate alignment with fewer manufacturing steps and lower production costs.
Problems solved by technology
Failing to do so likely results in poor image capture such as, for example, blurred images.
In reality, however, completely eliminating optical tilt in small camera modules is highly unlikely and, therefore, typically only achieved within a predetermined tolerance.
In manufacturing conventional camera modules, several challenges are encountered by manufacturers.
Of course, to control such a high number of parameters, camera module manufacturers must implement a high number of delicate and, therefore, expensive processes.
Not only does this high number of parameters complicate the overall manufacturing process, but also limits the overall quality of the camera module.
Indeed, the overall optical tilt tolerance becomes increasingly more difficult to satisfy as the number of parameters that need to be controlled increases.
Even if parameter errors are minimized to the manufacturing limit, they accumulate into a significant overall error because such a high number of parameters have to be controlled.
Thus, significant optical tilt and, therefore, poor image quality is oftentimes inevitable in conventional camera modules.
This particularly frustrates the further development of such camera modules because, even when minimized, the optical tilt is typically too severe to satisfy the needs of more complex lens systems (e.g., extended depth of field lens systems) and high resolution image capture devices.
The bottom surfaces of the support members abut the top surface of the image capture device, thereby causing the gap between the housing and the circuit substrate.
Method used
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[0033]The present invention overcomes the problems associated with the prior art, by providing a camera module that includes a housing supported and / or positioned directly on an ICD via a plurality of discrete support members. In the following description, numerous specific details are set forth (e.g., electrical bonding processes and elements, circuit substrate types, circuitry configurations, adhesive types, lenses, optical filters, etc.) in order to provide a thorough understanding of the invention. Those skilled in the art will recognize, however, that the invention may be practiced apart from these specific details. In other instances, details of well known camera module manufacturing practices (e.g., automated focus processes, materials selection, molding processes, etc.) and components (e.g., electronic circuitry, device interfaces, etc.) have been omitted, so as not to unnecessarily obscure the present invention.
[0034]FIG. 1 is a perspective view of a camera module 100 accor...
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A novel camera module includes a housing having a lens unit receiving portion and an image capture device receiving portion, which includes a plurality of discrete support members. A lens unit is coupled to the lens unit receiving portion of the housing. An image capture device has a top surface, which includes an image sensor array. The top surface of the image capture device contacts the bottom of the discrete support members of the housing to align the tilt of the image capture device with respect to the housing. In a particular embodiment, the image capture device is mounted on a surface of a circuit substrate that is coupled to the housing. In an alternate embodiment, the housing is coupled directly to the image capture device.
Description
RELATED APPLICATIONS[0001]This application is a continuation of U.S. patent application Ser. No. 12 / 928,026 (now U.S. Pat. No. 8,308,379) entitled “Three-Pole Tilt Control System For Camera Module” filed Dec. 1, 2010 by the same inventors, which is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates generally to electronic devices, and more particularly to digital camera modules. Even more particularly, the present invention relates to a system for controlling the optical alignment of a lens assembly with respect an image capture device.[0004]2. Description of the Background Art[0005]Digital camera modules are currently being incorporated into a variety of electronic devices. Such camera hosting devices include, but are not limited to, cellular telephones, personal data assistants (PDAs), and computers. The demand for digital camera modules continues to grow as the ability to incorporate the c...
Claims
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IPC IPC(8): G03B13/00H01L31/18H04N5/225
CPCG03B17/12H04N5/2253H04N5/2257Y10T29/49826Y10T29/49899Y10T156/10Y10T29/4913H04N23/54H04N23/57H04N23/51G02B5/208
InventorGOOI, KWANG JINTAN, TZER NANTAI, KEAN LEONG
OwnerNANCHANG O FILM OPTICAL ELECTRONICS TECH CO LTD