This disclosure relates generally to optics, and in particular to cameras.
Cameras have become ubiquitous as they are placed in an increasing number of devices such as smartphones, tablets, watches, and action cameras. Resolution, dynamic range, signal quality, and image acquisition time are key performance metrics for cameras and the image sensors that are included in cameras. As cameras get smaller to be included in additional contexts and use-cases, some or all of these performance metrics become more difficult to meet.
Non-limiting and non-exhaustive embodiments of the invention are described with reference to the following figures, wherein like reference numerals refer to like parts throughout the various views unless otherwise specified.
Embodiments of reducing a camera size and image sensor size using an adhesive or a dam compound are described herein. In the following description, numerous specific details are set forth to provide a thorough understanding of the embodiments. One skilled in the relevant art will recognize, however, that the techniques described herein can be practiced without one or more of the specific details, or with other methods, components, materials, etc. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring certain aspects.
Reference throughout this specification to “one embodiment” or “an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases “in one embodiment” or “in an embodiment” in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Throughout this specification, several terms of art are used. These terms are to take on their ordinary meaning in the art from which they come, unless specifically defined herein or the context of their use would clearly suggest otherwise.
In aspects of this disclosure, visible light may be defined as having a wavelength range of approximately 380 nm-700 nm. Non-visible light may be defined as light having wavelengths that are outside the visible light range, such as ultraviolet light and infrared light. Infrared light having a wavelength range of approximately 700 nm-1 mm includes near-infrared light. In aspects of this disclosure, near-infrared light may be defined as having a wavelength range of approximately 700 nm-1.6 μm.
In aspects of this disclosure, the term “transparent” may be defined as having greater than 90% transmission of light. In some aspects, the term “transparent” may be defined as a material having greater than 90% transmission of visible light.
Reducing a camera size allows camera modules to fit in more products and additional contexts. Cameras can be placed in electronic devices such as smartphones, tablets, vehicles, and drones. Reducing the size of a camera may also allow for the camera to be placed in a particular advantageous location in an Augmented Reality (AR), Mixed Reality (MR), or Virtual Reality (VR) device that was previously not possible, for example.
The filter assembly 370 may filter image light 399 propagating through lens elements 333 before reaching the image sensor package 320. In other implementations, filter assembly 370 may be disposed above some or all of lens elements 333. The filter assembly 370 may include one or more filters, such as: an infrared cut-off filter (IRCF), an infrared pass filter (IRPF), one or more other color filters, a micro lens positioned over each pixel of the image pixel array of image senor package 320, some other device for filtering light, or some combination thereof. The IRCF is a filter configured to block the infrared light and the ultraviolet light from the local area and propagate the visible light to the image senor package 320. The IRPF is a filter configured to block the visible light and ultraviolet light from the local area and propagate the infrared light to the image senor package 320.
In the illustration of
The illustrated image sensor package 320 includes an image pixel array, support circuitry (to initiate capturing images with the image pixel array) disposed around the image pixel array, and a ball grid array 327 configured to electrically coupled the support circuitry to the circuit board 360. Image sensor package 320 may be considered a chip scale package (CSP). The drawings of the disclosure may illustrate ball grid arrays (BGAs) included in the image sensor packages, although some image sensor packages contemplated by the disclosure may be without ball grid arrays while still being surface mount technology (SMT) components. Circuit board 360 may be a flex circuit or a rigid printed circuit board (PCB).
In
Dam compound 349 and/or adhesive 350 may adhere lens barrel 331 to the support circuitry in an inactive area of the image sensor package 320. Referring to
Referring again to
The dam compounds described in this disclosure may be a black color. The dam compounds described in this disclosure are opaque so that external ambient light will not propagate through the dam compound and become incident on the image pixel array of the image sensor package.
Camera 300 does not include a molding 240 (usually a plastic material) to support a lens assembly. In some implementations, ball grid array 327 of image sensor package 320 is configured to be the majority or sole mechanical support of lens assembly 330 between circuit board 360 and lens assembly 330.
Adhesive 351 may serve as a lens holder platform to support lens assembly 330. Adhesive 351 may include glass fibers and other materials to form a suitable coefficient of thermal expansion (CTE) bridge between image sensor package 320 and lens barrel 331. Adhesive 351 may also be configured to block incident ambient light from becoming incident on the image pixel array of image sensor package 320.
In
In
In an implementation of camera 303, ball grid array 327 of the image sensor package 320 is configured to be the sole mechanical support of lens assembly 330 between circuit board 360 and lens assembly 330. The lens barrel 331 may be sized substantially similar to a length and width of the image sensor package 320.
In
In
In process block 705, an image sensor package is received. The image sensor package includes: (1) an image pixel array; (2) support circuitry disposed around the image pixel array; (3) a ball grid array configured to electrically couple the support circuitry to a circuit board; (4) coverglass configured to protect the image pixel array and pass image light to the image pixel array; and (5) a dam compound configured to bond the coverglass to the support circuitry.
In process block 710, the coverglass is removed from the image sensor package.
In process block 715, a lens assembly is bonded to the image sensor package after the coverglass has been removed from the image sensor package in process block 710.
In some implementations, process 700 further includes electrically coupling the ball grid array to the circuit board.
In some implementations of process 700, the dam compound is reused as a lens holder platform to bond the lens assembly to the support circuitry of the image sensor package.
In some implementations of process 700, the dam compound is reflowed to be reused as a lens holder platform to bond the lens assembly to the image sensor package.
In some implementations, the ball grid array of the image sensor package is configured to be the sole mechanical support of the lens assembly between the circuit board and lens assembly.
In process block 805, an image sensor package is received. The image sensor package includes: (1) an image pixel array; (2) support circuitry disposed around the image pixel array; and (3) a ball grid array configured to electrically couple the support circuitry to a circuit board.
In process block 810, a dam compound is disposed along an outer boundary of the support circuitry of the image sensor package.
In process block 815, a removeable protection shield is applied to the dam compound to seal the image pixel array from contaminants. The image sensor package with the removeable protection shield (e.g. tape or film) may be shipped to a module integrator and module integrator may remove the protection film before the image sensor package on a printed circuit board (either flex or rigid) is ready to accept the lens assembly to be bonded to the image sensor package.
Some implementations of process 800 further include: placing the image sensor package onto the circuit board by electrically coupling the ball grid array to the circuit board with a surface mount technology (SMT) machine; removing the removeable protection shield from the dam compound after the image sensor package has been placed onto the circuit board; and bonding the lens assembly to the dam compound. The bonding of the lens assembly to the image sensor package is performed subsequent to the removeable protection shield being removed.
In implementations of the disclosure, the lens structure of the lens assemblies may be square, circular, or irregular shapes based on the lens design. The z-direction (height) of the dam compound may vary to allow for the formation of additional glue surface area.
Embodiments of the invention may include or be implemented in conjunction with an artificial reality system. Artificial reality is a form of reality that has been adjusted in some manner before presentation to a user, which may include, e.g., a virtual reality (VR), an augmented reality (AR), a mixed reality (MR), a hybrid reality, or some combination and/or derivatives thereof. Artificial reality content may include completely generated content or generated content combined with captured (e.g., real-world) content. The artificial reality content may include video, audio, haptic feedback, or some combination thereof, and any of which may be presented in a single channel or in multiple channels (such as stereo video that produces a three-dimensional effect to the viewer). Additionally, in some embodiments, artificial reality may also be associated with applications, products, accessories, services, or some combination thereof, that are used to, e.g., create content in an artificial reality and/or are otherwise used in (e.g., perform activities in) an artificial reality. The artificial reality system that provides the artificial reality content may be implemented on various platforms, including a head-mounted display (HMD) connected to a host computer system, a standalone HMD, a mobile device or computing system, or any other hardware platform capable of providing artificial reality content to one or more viewers.
The term “processing logic” in this disclosure may include one or more processors, microprocessors, multi-core processors, Application-specific integrated circuits (ASIC), and/or Field Programmable Gate Arrays (FPGAs) to execute operations disclosed herein. In some embodiments, memories (not illustrated) are integrated into the processing logic to store instructions to execute operations and/or store data. Processing logic may also include analog or digital circuitry to perform the operations in accordance with embodiments of the disclosure.
A “memory” or “memories” described in this disclosure may include one or more volatile or non-volatile memory architectures. The “memory” or “memories” may be removable and non-removable media implemented in any method or technology for storage of information such as computer-readable instructions, data structures, program modules, or other data. Example memory technologies may include RAM, ROM, EEPROM, flash memory, CD-ROM, digital versatile disks (DVD), high-definition multimedia/data storage disks, or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information for access by a computing device.
Networks may include any network or network system such as, but not limited to, the following: a peer-to-peer network; a Local Area Network (LAN); a Wide Area Network (WAN); a public network, such as the Internet; a private network; a cellular network; a wireless network; a wired network; a wireless and wired combination network; and a satellite network.
Communication channels may include or be routed through one or more wired or wireless communication utilizing IEEE 802.11 protocols, short-range wireless protocols, SPI (Serial Peripheral Interface), I2C (Inter-Integrated Circuit), USB (Universal Serial Port), CAN (Controller Area Network), cellular data protocols (e.g. 3G, 4G, LTE, 5G), optical communication networks, Internet Service Providers (ISPs), a peer-to-peer network, a Local Area Network (LAN), a Wide Area Network (WAN), a public network (e.g. “the Internet”), a private network, a satellite network, or otherwise.
A computing device may include a desktop computer, a laptop computer, a tablet, a phablet, a smartphone, a feature phone, a server computer, or otherwise. A server computer may be located remotely in a data center or be stored locally.
The processes explained above are described in terms of computer software and hardware. The techniques described may constitute machine-executable instructions embodied within a tangible or non-transitory machine (e.g., computer) readable storage medium, that when executed by a machine will cause the machine to perform the operations described. Additionally, the processes may be embodied within hardware, such as an application specific integrated circuit (“ASIC”) or otherwise.
A tangible non-transitory machine-readable storage medium includes any mechanism that provides (i.e., stores) information in a form accessible by a machine (e.g., a computer, network device, personal digital assistant, manufacturing tool, any device with a set of one or more processors, etc.). For example, a machine-readable storage medium includes recordable/non-recordable media (e.g., read only memory (ROM), random access memory (RAM), magnetic disk storage media, optical storage media, flash memory devices, etc.).
The above description of illustrated embodiments of the invention, including what is described in the Abstract, is not intended to be exhaustive or to limit the invention to the precise forms disclosed. While specific embodiments of, and examples for, the invention are described herein for illustrative purposes, various modifications are possible within the scope of the invention, as those skilled in the relevant art will recognize.
These modifications can be made to the invention in light of the above detailed description. The terms used in the following claims should not be construed to limit the invention to the specific embodiments disclosed in the specification. Rather, the scope of the invention is to be determined entirely by the following claims, which are to be construed in accordance with established doctrines of claim interpretation.
This application claims priority to U.S. provisional Application No. 63/543,777 filed Oct. 12, 2023, which is hereby incorporated by reference.
| Number | Date | Country | |
|---|---|---|---|
| 63543777 | Oct 2023 | US |